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-rw-r--r--drivers/dma/Kconfig26
-rw-r--r--drivers/dma/Makefile4
-rw-r--r--drivers/dma/at_hdmac.c11
-rw-r--r--drivers/dma/coh901318.c72
-rw-r--r--drivers/dma/dmaengine.c20
-rw-r--r--drivers/dma/dw_dmac.c184
-rw-r--r--drivers/dma/dw_dmac_regs.h8
-rw-r--r--drivers/dma/imx-sdma.c6
-rw-r--r--drivers/dma/ipu/ipu_idmac.c8
-rw-r--r--drivers/dma/ipu/ipu_irq.c14
-rw-r--r--drivers/dma/mmp_tdma.c610
-rw-r--r--drivers/dma/mxs-dma.c3
-rw-r--r--drivers/dma/pl330.c30
-rw-r--r--drivers/dma/sh/Makefile2
-rw-r--r--drivers/dma/sh/shdma-base.c934
-rw-r--r--drivers/dma/sh/shdma.c943
-rw-r--r--drivers/dma/sh/shdma.h (renamed from drivers/dma/shdma.h)46
-rw-r--r--drivers/dma/shdma.c1524
-rw-r--r--drivers/dma/tegra20-apb-dma.c1415
19 files changed, 4112 insertions, 1748 deletions
diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig
index aadeb5be9dba..d45cf1bcbde5 100644
--- a/drivers/dma/Kconfig
+++ b/drivers/dma/Kconfig
@@ -148,6 +148,20 @@ config TXX9_DMAC
Support the TXx9 SoC internal DMA controller. This can be
integrated in chips such as the Toshiba TX4927/38/39.
+config TEGRA20_APB_DMA
+ bool "NVIDIA Tegra20 APB DMA support"
+ depends on ARCH_TEGRA
+ select DMA_ENGINE
+ help
+ Support for the NVIDIA Tegra20 APB DMA controller driver. The
+ DMA controller is having multiple DMA channel which can be
+ configured for different peripherals like audio, UART, SPI,
+ I2C etc which is in APB bus.
+ This DMA controller transfers data from memory to peripheral fifo
+ or vice versa. It does not support memory to memory data transfer.
+
+
+
config SH_DMAE
tristate "Renesas SuperH DMAC support"
depends on (SUPERH && SH_DMA) || (ARM && ARCH_SHMOBILE)
@@ -237,7 +251,7 @@ config IMX_DMA
config MXS_DMA
bool "MXS DMA support"
- depends on SOC_IMX23 || SOC_IMX28
+ depends on SOC_IMX23 || SOC_IMX28 || SOC_IMX6Q
select STMP_DEVICE
select DMA_ENGINE
help
@@ -260,6 +274,16 @@ config DMA_SA11X0
SA-1110 SoCs. This DMA engine can only be used with on-chip
devices.
+config MMP_TDMA
+ bool "MMP Two-Channel DMA support"
+ depends on ARCH_MMP
+ select DMA_ENGINE
+ help
+ Support the MMP Two-Channel DMA engine.
+ This engine used for MMP Audio DMA and pxa910 SQU.
+
+ Say Y here if you enabled MMP ADMA, otherwise say N.
+
config DMA_ENGINE
bool
diff --git a/drivers/dma/Makefile b/drivers/dma/Makefile
index 86b795baba98..640356add0a3 100644
--- a/drivers/dma/Makefile
+++ b/drivers/dma/Makefile
@@ -14,7 +14,7 @@ obj-$(CONFIG_DW_DMAC) += dw_dmac.o
obj-$(CONFIG_AT_HDMAC) += at_hdmac.o
obj-$(CONFIG_MX3_IPU) += ipu/
obj-$(CONFIG_TXX9_DMAC) += txx9dmac.o
-obj-$(CONFIG_SH_DMAE) += shdma.o
+obj-$(CONFIG_SH_DMAE) += sh/
obj-$(CONFIG_COH901318) += coh901318.o coh901318_lli.o
obj-$(CONFIG_AMCC_PPC440SPE_ADMA) += ppc4xx/
obj-$(CONFIG_IMX_SDMA) += imx-sdma.o
@@ -23,8 +23,10 @@ obj-$(CONFIG_MXS_DMA) += mxs-dma.o
obj-$(CONFIG_TIMB_DMA) += timb_dma.o
obj-$(CONFIG_SIRF_DMA) += sirf-dma.o
obj-$(CONFIG_STE_DMA40) += ste_dma40.o ste_dma40_ll.o
+obj-$(CONFIG_TEGRA20_APB_DMA) += tegra20-apb-dma.o
obj-$(CONFIG_PL330_DMA) += pl330.o
obj-$(CONFIG_PCH_DMA) += pch_dma.o
obj-$(CONFIG_AMBA_PL08X) += amba-pl08x.o
obj-$(CONFIG_EP93XX_DMA) += ep93xx_dma.o
obj-$(CONFIG_DMA_SA11X0) += sa11x0-dma.o
+obj-$(CONFIG_MMP_TDMA) += mmp_tdma.o
diff --git a/drivers/dma/at_hdmac.c b/drivers/dma/at_hdmac.c
index 7292aa87b2dd..3934fcc4e00b 100644
--- a/drivers/dma/at_hdmac.c
+++ b/drivers/dma/at_hdmac.c
@@ -9,10 +9,9 @@
* (at your option) any later version.
*
*
- * This supports the Atmel AHB DMA Controller,
- *
- * The driver has currently been tested with the Atmel AT91SAM9RL
- * and AT91SAM9G45 series.
+ * This supports the Atmel AHB DMA Controller found in several Atmel SoCs.
+ * The only Atmel DMA Controller that is not covered by this driver is the one
+ * found on AT91SAM9263.
*/
#include <linux/clk.h>
@@ -1217,7 +1216,7 @@ static const struct platform_device_id atdma_devtypes[] = {
}
};
-static inline struct at_dma_platform_data * __init at_dma_get_driver_data(
+static inline const struct at_dma_platform_data * __init at_dma_get_driver_data(
struct platform_device *pdev)
{
if (pdev->dev.of_node) {
@@ -1255,7 +1254,7 @@ static int __init at_dma_probe(struct platform_device *pdev)
int irq;
int err;
int i;
- struct at_dma_platform_data *plat_dat;
+ const struct at_dma_platform_data *plat_dat;
/* setup platform data for each SoC */
dma_cap_set(DMA_MEMCPY, at91sam9rl_config.cap_mask);
diff --git a/drivers/dma/coh901318.c b/drivers/dma/coh901318.c
index e67b4e06a918..aa384e53b7ac 100644
--- a/drivers/dma/coh901318.c
+++ b/drivers/dma/coh901318.c
@@ -1438,34 +1438,32 @@ static int __init coh901318_probe(struct platform_device *pdev)
io = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!io)
- goto err_get_resource;
+ return -ENODEV;
/* Map DMA controller registers to virtual memory */
- if (request_mem_region(io->start,
- resource_size(io),
- pdev->dev.driver->name) == NULL) {
- err = -EBUSY;
- goto err_request_mem;
- }
+ if (devm_request_mem_region(&pdev->dev,
+ io->start,
+ resource_size(io),
+ pdev->dev.driver->name) == NULL)
+ return -ENOMEM;
pdata = pdev->dev.platform_data;
if (!pdata)
- goto err_no_platformdata;
+ return -ENODEV;
- base = kmalloc(ALIGN(sizeof(struct coh901318_base), 4) +
- pdata->max_channels *
- sizeof(struct coh901318_chan),
- GFP_KERNEL);
+ base = devm_kzalloc(&pdev->dev,
+ ALIGN(sizeof(struct coh901318_base), 4) +
+ pdata->max_channels *
+ sizeof(struct coh901318_chan),
+ GFP_KERNEL);
if (!base)
- goto err_alloc_coh_dma_channels;
+ return -ENOMEM;
base->chans = ((void *)base) + ALIGN(sizeof(struct coh901318_base), 4);
- base->virtbase = ioremap(io->start, resource_size(io));
- if (!base->virtbase) {
- err = -ENOMEM;
- goto err_no_ioremap;
- }
+ base->virtbase = devm_ioremap(&pdev->dev, io->start, resource_size(io));
+ if (!base->virtbase)
+ return -ENOMEM;
base->dev = &pdev->dev;
base->platform = pdata;
@@ -1474,25 +1472,20 @@ static int __init coh901318_probe(struct platform_device *pdev)
COH901318_DEBUGFS_ASSIGN(debugfs_dma_base, base);
- platform_set_drvdata(pdev, base);
-
irq = platform_get_irq(pdev, 0);
if (irq < 0)
- goto err_no_irq;
-
- err = request_irq(irq, dma_irq_handler, IRQF_DISABLED,
- "coh901318", base);
- if (err) {
- dev_crit(&pdev->dev,
- "Cannot allocate IRQ for DMA controller!\n");
- goto err_request_irq;
- }
+ return irq;
+
+ err = devm_request_irq(&pdev->dev, irq, dma_irq_handler, IRQF_DISABLED,
+ "coh901318", base);
+ if (err)
+ return err;
err = coh901318_pool_create(&base->pool, &pdev->dev,
sizeof(struct coh901318_lli),
32);
if (err)
- goto err_pool_create;
+ return err;
/* init channels for device transfers */
coh901318_base_init(&base->dma_slave, base->platform->chans_slave,
@@ -1538,6 +1531,7 @@ static int __init coh901318_probe(struct platform_device *pdev)
if (err)
goto err_register_memcpy;
+ platform_set_drvdata(pdev, base);
dev_info(&pdev->dev, "Initialized COH901318 DMA on virtual base 0x%08x\n",
(u32) base->virtbase);
@@ -1547,19 +1541,6 @@ static int __init coh901318_probe(struct platform_device *pdev)
dma_async_device_unregister(&base->dma_slave);
err_register_slave:
coh901318_pool_destroy(&base->pool);
- err_pool_create:
- free_irq(platform_get_irq(pdev, 0), base);
- err_request_irq:
- err_no_irq:
- iounmap(base->virtbase);
- err_no_ioremap:
- kfree(base);
- err_alloc_coh_dma_channels:
- err_no_platformdata:
- release_mem_region(pdev->resource->start,
- resource_size(pdev->resource));
- err_request_mem:
- err_get_resource:
return err;
}
@@ -1570,11 +1551,6 @@ static int __exit coh901318_remove(struct platform_device *pdev)
dma_async_device_unregister(&base->dma_memcpy);
dma_async_device_unregister(&base->dma_slave);
coh901318_pool_destroy(&base->pool);
- free_irq(platform_get_irq(pdev, 0), base);
- iounmap(base->virtbase);
- kfree(base);
- release_mem_region(pdev->resource->start,
- resource_size(pdev->resource));
return 0;
}
diff --git a/drivers/dma/dmaengine.c b/drivers/dma/dmaengine.c
index 2397f6f451b1..3491654cdf7b 100644
--- a/drivers/dma/dmaengine.c
+++ b/drivers/dma/dmaengine.c
@@ -45,6 +45,8 @@
* See Documentation/dmaengine.txt for more details
*/
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
#include <linux/dma-mapping.h>
#include <linux/init.h>
#include <linux/module.h>
@@ -261,7 +263,7 @@ enum dma_status dma_sync_wait(struct dma_chan *chan, dma_cookie_t cookie)
do {
status = dma_async_is_tx_complete(chan, cookie, NULL, NULL);
if (time_after_eq(jiffies, dma_sync_wait_timeout)) {
- printk(KERN_ERR "dma_sync_wait_timeout!\n");
+ pr_err("%s: timeout!\n", __func__);
return DMA_ERROR;
}
} while (status == DMA_IN_PROGRESS);
@@ -312,7 +314,7 @@ static int __init dma_channel_table_init(void)
}
if (err) {
- pr_err("dmaengine: initialization failure\n");
+ pr_err("initialization failure\n");
for_each_dma_cap_mask(cap, dma_cap_mask_all)
if (channel_table[cap])
free_percpu(channel_table[cap]);
@@ -520,12 +522,12 @@ struct dma_chan *__dma_request_channel(dma_cap_mask_t *mask, dma_filter_fn fn, v
err = dma_chan_get(chan);
if (err == -ENODEV) {
- pr_debug("%s: %s module removed\n", __func__,
- dma_chan_name(chan));
+ pr_debug("%s: %s module removed\n",
+ __func__, dma_chan_name(chan));
list_del_rcu(&device->global_node);
} else if (err)
pr_debug("%s: failed to get %s: (%d)\n",
- __func__, dma_chan_name(chan), err);
+ __func__, dma_chan_name(chan), err);
else
break;
if (--device->privatecnt == 0)
@@ -535,7 +537,9 @@ struct dma_chan *__dma_request_channel(dma_cap_mask_t *mask, dma_filter_fn fn, v
}
mutex_unlock(&dma_list_mutex);
- pr_debug("%s: %s (%s)\n", __func__, chan ? "success" : "fail",
+ pr_debug("%s: %s (%s)\n",
+ __func__,
+ chan ? "success" : "fail",
chan ? dma_chan_name(chan) : NULL);
return chan;
@@ -579,7 +583,7 @@ void dmaengine_get(void)
break;
} else if (err)
pr_err("%s: failed to get %s: (%d)\n",
- __func__, dma_chan_name(chan), err);
+ __func__, dma_chan_name(chan), err);
}
}
@@ -1015,7 +1019,7 @@ dma_wait_for_async_tx(struct dma_async_tx_descriptor *tx)
while (tx->cookie == -EBUSY) {
if (time_after_eq(jiffies, dma_sync_wait_timeout)) {
pr_err("%s timeout waiting for descriptor submission\n",
- __func__);
+ __func__);
return DMA_ERROR;
}
cpu_relax();
diff --git a/drivers/dma/dw_dmac.c b/drivers/dma/dw_dmac.c
index e23dc82d43ac..d3c5a5a88f1e 100644
--- a/drivers/dma/dw_dmac.c
+++ b/drivers/dma/dw_dmac.c
@@ -105,13 +105,13 @@ static struct dw_desc *dwc_desc_get(struct dw_dma_chan *dwc)
spin_lock_irqsave(&dwc->lock, flags);
list_for_each_entry_safe(desc, _desc, &dwc->free_list, desc_node) {
+ i++;
if (async_tx_test_ack(&desc->txd)) {
list_del(&desc->desc_node);
ret = desc;
break;
}
dev_dbg(chan2dev(&dwc->chan), "desc %p not ACKed\n", desc);
- i++;
}
spin_unlock_irqrestore(&dwc->lock, flags);
@@ -191,6 +191,42 @@ static void dwc_initialize(struct dw_dma_chan *dwc)
/*----------------------------------------------------------------------*/
+static inline unsigned int dwc_fast_fls(unsigned long long v)
+{
+ /*
+ * We can be a lot more clever here, but this should take care
+ * of the most common optimization.
+ */
+ if (!(v & 7))
+ return 3;
+ else if (!(v & 3))
+ return 2;
+ else if (!(v & 1))
+ return 1;
+ return 0;
+}
+
+static void dwc_dump_chan_regs(struct dw_dma_chan *dwc)
+{
+ dev_err(chan2dev(&dwc->chan),
+ " SAR: 0x%x DAR: 0x%x LLP: 0x%x CTL: 0x%x:%08x\n",
+ channel_readl(dwc, SAR),
+ channel_readl(dwc, DAR),
+ channel_readl(dwc, LLP),
+ channel_readl(dwc, CTL_HI),
+ channel_readl(dwc, CTL_LO));
+}
+
+
+static inline void dwc_chan_disable(struct dw_dma *dw, struct dw_dma_chan *dwc)
+{
+ channel_clear_bit(dw, CH_EN, dwc->mask);
+ while (dma_readl(dw, CH_EN) & dwc->mask)
+ cpu_relax();
+}
+
+/*----------------------------------------------------------------------*/
+
/* Called with dwc->lock held and bh disabled */
static void dwc_dostart(struct dw_dma_chan *dwc, struct dw_desc *first)
{
@@ -200,13 +236,7 @@ static void dwc_dostart(struct dw_dma_chan *dwc, struct dw_desc *first)
if (dma_readl(dw, CH_EN) & dwc->mask) {
dev_err(chan2dev(&dwc->chan),
"BUG: Attempted to start non-idle channel\n");
- dev_err(chan2dev(&dwc->chan),
- " SAR: 0x%x DAR: 0x%x LLP: 0x%x CTL: 0x%x:%08x\n",
- channel_readl(dwc, SAR),
- channel_readl(dwc, DAR),
- channel_readl(dwc, LLP),
- channel_readl(dwc, CTL_HI),
- channel_readl(dwc, CTL_LO));
+ dwc_dump_chan_regs(dwc);
/* The tasklet will hopefully advance the queue... */
return;
@@ -290,9 +320,7 @@ static void dwc_complete_all(struct dw_dma *dw, struct dw_dma_chan *dwc)
"BUG: XFER bit set, but channel not idle!\n");
/* Try to continue after resetting the channel... */
- channel_clear_bit(dw, CH_EN, dwc->mask);
- while (dma_readl(dw, CH_EN) & dwc->mask)
- cpu_relax();
+ dwc_chan_disable(dw, dwc);
}
/*
@@ -337,7 +365,8 @@ static void dwc_scan_descriptors(struct dw_dma *dw, struct dw_dma_chan *dwc)
return;
}
- dev_vdbg(chan2dev(&dwc->chan), "scan_descriptors: llp=0x%x\n", llp);
+ dev_vdbg(chan2dev(&dwc->chan), "%s: llp=0x%llx\n", __func__,
+ (unsigned long long)llp);
list_for_each_entry_safe(desc, _desc, &dwc->active_list, desc_node) {
/* check first descriptors addr */
@@ -373,9 +402,7 @@ static void dwc_scan_descriptors(struct dw_dma *dw, struct dw_dma_chan *dwc)
"BUG: All descriptors done, but channel not idle!\n");
/* Try to continue after resetting the channel... */
- channel_clear_bit(dw, CH_EN, dwc->mask);
- while (dma_readl(dw, CH_EN) & dwc->mask)
- cpu_relax();
+ dwc_chan_disable(dw, dwc);
if (!list_empty(&dwc->queue)) {
list_move(dwc->queue.next, &dwc->active_list);
@@ -384,12 +411,11 @@ static void dwc_scan_descriptors(struct dw_dma *dw, struct dw_dma_chan *dwc)
spin_unlock_irqrestore(&dwc->lock, flags);
}
-static void dwc_dump_lli(struct dw_dma_chan *dwc, struct dw_lli *lli)
+static inline void dwc_dump_lli(struct dw_dma_chan *dwc, struct dw_lli *lli)
{
dev_printk(KERN_CRIT, chan2dev(&dwc->chan),
" desc: s0x%x d0x%x l0x%x c0x%x:%x\n",
- lli->sar, lli->dar, lli->llp,
- lli->ctlhi, lli->ctllo);
+ lli->sar, lli->dar, lli->llp, lli->ctlhi, lli->ctllo);
}
static void dwc_handle_error(struct dw_dma *dw, struct dw_dma_chan *dwc)
@@ -487,17 +513,9 @@ static void dwc_handle_cyclic(struct dw_dma *dw, struct dw_dma_chan *dwc,
spin_lock_irqsave(&dwc->lock, flags);
- dev_err(chan2dev(&dwc->chan),
- " SAR: 0x%x DAR: 0x%x LLP: 0x%x CTL: 0x%x:%08x\n",
- channel_readl(dwc, SAR),
- channel_readl(dwc, DAR),
- channel_readl(dwc, LLP),
- channel_readl(dwc, CTL_HI),
- channel_readl(dwc, CTL_LO));
+ dwc_dump_chan_regs(dwc);
- channel_clear_bit(dw, CH_EN, dwc->mask);
- while (dma_readl(dw, CH_EN) & dwc->mask)
- cpu_relax();
+ dwc_chan_disable(dw, dwc);
/* make sure DMA does not restart by loading a new list */
channel_writel(dwc, LLP, 0);
@@ -527,7 +545,7 @@ static void dw_dma_tasklet(unsigned long data)
status_xfer = dma_readl(dw, RAW.XFER);
status_err = dma_readl(dw, RAW.ERROR);
- dev_vdbg(dw->dma.dev, "tasklet: status_err=%x\n", status_err);
+ dev_vdbg(dw->dma.dev, "%s: status_err=%x\n", __func__, status_err);
for (i = 0; i < dw->dma.chancnt; i++) {
dwc = &dw->chan[i];
@@ -551,7 +569,7 @@ static irqreturn_t dw_dma_interrupt(int irq, void *dev_id)
struct dw_dma *dw = dev_id;
u32 status;
- dev_vdbg(dw->dma.dev, "interrupt: status=0x%x\n",
+ dev_vdbg(dw->dma.dev, "%s: status=0x%x\n", __func__,
dma_readl(dw, STATUS_INT));
/*
@@ -597,12 +615,12 @@ static dma_cookie_t dwc_tx_submit(struct dma_async_tx_descriptor *tx)
* for DMA. But this is hard to do in a race-free manner.
*/
if (list_empty(&dwc->active_list)) {
- dev_vdbg(chan2dev(tx->chan), "tx_submit: started %u\n",
+ dev_vdbg(chan2dev(tx->chan), "%s: started %u\n", __func__,
desc->txd.cookie);
list_add_tail(&desc->desc_node, &dwc->active_list);
dwc_dostart(dwc, dwc_first_active(dwc));
} else {
- dev_vdbg(chan2dev(tx->chan), "tx_submit: queued %u\n",
+ dev_vdbg(chan2dev(tx->chan), "%s: queued %u\n", __func__,
desc->txd.cookie);
list_add_tail(&desc->desc_node, &dwc->queue);
@@ -627,26 +645,17 @@ dwc_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
unsigned int dst_width;
u32 ctllo;
- dev_vdbg(chan2dev(chan), "prep_dma_memcpy d0x%x s0x%x l0x%zx f0x%lx\n",
- dest, src, len, flags);
+ dev_vdbg(chan2dev(chan),
+ "%s: d0x%llx s0x%llx l0x%zx f0x%lx\n", __func__,
+ (unsigned long long)dest, (unsigned long long)src,
+ len, flags);
if (unlikely(!len)) {
- dev_dbg(chan2dev(chan), "prep_dma_memcpy: length is zero!\n");
+ dev_dbg(chan2dev(chan), "%s: length is zero!\n", __func__);
return NULL;
}
- /*
- * We can be a lot more clever here, but this should take care
- * of the most common optimization.
- */
- if (!((src | dest | len) & 7))
- src_width = dst_width = 3;
- else if (!((src | dest | len) & 3))
- src_width = dst_width = 2;
- else if (!((src | dest | len) & 1))
- src_width = dst_width = 1;
- else
- src_width = dst_width = 0;
+ src_width = dst_width = dwc_fast_fls(src | dest | len);
ctllo = DWC_DEFAULT_CTLLO(chan)
| DWC_CTLL_DST_WIDTH(dst_width)
@@ -720,7 +729,7 @@ dwc_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
struct scatterlist *sg;
size_t total_len = 0;
- dev_vdbg(chan2dev(chan), "prep_dma_slave\n");
+ dev_vdbg(chan2dev(chan), "%s\n", __func__);
if (unlikely(!dws || !sg_len))
return NULL;
@@ -746,14 +755,7 @@ dwc_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
mem = sg_dma_address(sg);
len = sg_dma_len(sg);
- if (!((mem | len) & 7))
- mem_width = 3;
- else if (!((mem | len) & 3))
- mem_width = 2;
- else if (!((mem | len) & 1))
- mem_width = 1;
- else
- mem_width = 0;
+ mem_width = dwc_fast_fls(mem | len);
slave_sg_todev_fill_desc:
desc = dwc_desc_get(dwc);
@@ -813,14 +815,7 @@ slave_sg_todev_fill_desc:
mem = sg_dma_address(sg);
len = sg_dma_len(sg);
- if (!((mem | len) & 7))
- mem_width = 3;
- else if (!((mem | len) & 3))
- mem_width = 2;
- else if (!((mem | len) & 1))
- mem_width = 1;
- else
- mem_width = 0;
+ mem_width = dwc_fast_fls(mem | len);
slave_sg_fromdev_fill_desc:
desc = dwc_desc_get(dwc);
@@ -950,9 +945,7 @@ static int dwc_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd,
} else if (cmd == DMA_TERMINATE_ALL) {
spin_lock_irqsave(&dwc->lock, flags);
- channel_clear_bit(dw, CH_EN, dwc->mask);
- while (dma_readl(dw, CH_EN) & dwc->mask)
- cpu_relax();
+ dwc_chan_disable(dw, dwc);
dwc->paused = false;
@@ -1014,7 +1007,7 @@ static int dwc_alloc_chan_resources(struct dma_chan *chan)
int i;
unsigned long flags;
- dev_vdbg(chan2dev(chan), "alloc_chan_resources\n");
+ dev_vdbg(chan2dev(chan), "%s\n", __func__);
/* ASSERT: channel is idle */
if (dma_readl(dw, CH_EN) & dwc->mask) {
@@ -1057,8 +1050,7 @@ static int dwc_alloc_chan_resources(struct dma_chan *chan)
spin_unlock_irqrestore(&dwc->lock, flags);
- dev_dbg(chan2dev(chan),
- "alloc_chan_resources allocated %d descriptors\n", i);
+ dev_dbg(chan2dev(chan), "%s: allocated %d descriptors\n", __func__, i);
return i;
}
@@ -1071,7 +1063,7 @@ static void dwc_free_chan_resources(struct dma_chan *chan)
unsigned long flags;
LIST_HEAD(list);
- dev_dbg(chan2dev(chan), "free_chan_resources (descs allocated=%u)\n",
+ dev_dbg(chan2dev(chan), "%s: descs allocated=%u\n", __func__,
dwc->descs_allocated);
/* ASSERT: channel is idle */
@@ -1097,7 +1089,7 @@ static void dwc_free_chan_resources(struct dma_chan *chan)
kfree(desc);
}
- dev_vdbg(chan2dev(chan), "free_chan_resources done\n");
+ dev_vdbg(chan2dev(chan), "%s: done\n", __func__);
}
/* --------------------- Cyclic DMA API extensions -------------------- */
@@ -1126,13 +1118,7 @@ int dw_dma_cyclic_start(struct dma_chan *chan)
if (dma_readl(dw, CH_EN) & dwc->mask) {
dev_err(chan2dev(&dwc->chan),
"BUG: Attempted to start non-idle channel\n");
- dev_err(chan2dev(&dwc->chan),
- " SAR: 0x%x DAR: 0x%x LLP: 0x%x CTL: 0x%x:%08x\n",
- channel_readl(dwc, SAR),
- channel_readl(dwc, DAR),
- channel_readl(dwc, LLP),
- channel_readl(dwc, CTL_HI),
- channel_readl(dwc, CTL_LO));
+ dwc_dump_chan_regs(dwc);
spin_unlock_irqrestore(&dwc->lock, flags);
return -EBUSY;
}
@@ -1167,9 +1153,7 @@ void dw_dma_cyclic_stop(struct dma_chan *chan)
spin_lock_irqsave(&dwc->lock, flags);
- channel_clear_bit(dw, CH_EN, dwc->mask);
- while (dma_readl(dw, CH_EN) & dwc->mask)
- cpu_relax();
+ dwc_chan_disable(dw, dwc);
spin_unlock_irqrestore(&dwc->lock, flags);
}
@@ -1308,9 +1292,9 @@ struct dw_cyclic_desc *dw_dma_cyclic_prep(struct dma_chan *chan,
dma_sync_single_for_device(chan2parent(chan), last->txd.phys,
sizeof(last->lli), DMA_TO_DEVICE);
- dev_dbg(chan2dev(&dwc->chan), "cyclic prepared buf 0x%08x len %zu "
- "period %zu periods %d\n", buf_addr, buf_len,
- period_len, periods);
+ dev_dbg(chan2dev(&dwc->chan), "cyclic prepared buf 0x%llx len %zu "
+ "period %zu periods %d\n", (unsigned long long)buf_addr,
+ buf_len, period_len, periods);
cdesc->periods = periods;
dwc->cdesc = cdesc;
@@ -1340,16 +1324,14 @@ void dw_dma_cyclic_free(struct dma_chan *chan)
int i;
unsigned long flags;
- dev_dbg(chan2dev(&dwc->chan), "cyclic free\n");
+ dev_dbg(chan2dev(&dwc->chan), "%s\n", __func__);
if (!cdesc)
return;
spin_lock_irqsave(&dwc->lock, flags);
- channel_clear_bit(dw, CH_EN, dwc->mask);
- while (dma_readl(dw, CH_EN) & dwc->mask)
- cpu_relax();
+ dwc_chan_disable(dw, dwc);
dma_writel(dw, CLEAR.ERROR, dwc->mask);
dma_writel(dw, CLEAR.XFER, dwc->mask);
@@ -1386,7 +1368,7 @@ static void dw_dma_off(struct dw_dma *dw)
dw->chan[i].initialized = false;
}
-static int __init dw_probe(struct platform_device *pdev)
+static int __devinit dw_probe(struct platform_device *pdev)
{
struct dw_dma_platform_data *pdata;
struct resource *io;
@@ -1432,9 +1414,15 @@ static int __init dw_probe(struct platform_device *pdev)
}
clk_prepare_enable(dw->clk);
+ /* Calculate all channel mask before DMA setup */
+ dw->all_chan_mask = (1 << pdata->nr_channels) - 1;
+
/* force dma off, just in case */
dw_dma_off(dw);
+ /* disable BLOCK interrupts as well */
+ channel_clear_bit(dw, MASK.BLOCK, dw->all_chan_mask);
+
err = request_irq(irq, dw_dma_interrupt, 0, "dw_dmac", dw);
if (err)
goto err_irq;
@@ -1443,8 +1431,6 @@ static int __init dw_probe(struct platform_device *pdev)
tasklet_init(&dw->tasklet, dw_dma_tasklet, (unsigned long)dw);
- dw->all_chan_mask = (1 << pdata->nr_channels) - 1;
-
INIT_LIST_HEAD(&dw->dma.channels);
for (i = 0; i < pdata->nr_channels; i++) {
struct dw_dma_chan *dwc = &dw->chan[i];
@@ -1474,17 +1460,13 @@ static int __init dw_probe(struct platform_device *pdev)
channel_clear_bit(dw, CH_EN, dwc->mask);
}
- /* Clear/disable all interrupts on all channels. */
+ /* Clear all interrupts on all channels. */
dma_writel(dw, CLEAR.XFER, dw->all_chan_mask);
+ dma_writel(dw, CLEAR.BLOCK, dw->all_chan_mask);
dma_writel(dw, CLEAR.SRC_TRAN, dw->all_chan_mask);
dma_writel(dw, CLEAR.DST_TRAN, dw->all_chan_mask);
dma_writel(dw, CLEAR.ERROR, dw->all_chan_mask);
- channel_clear_bit(dw, MASK.XFER, dw->all_chan_mask);
- channel_clear_bit(dw, MASK.SRC_TRAN, dw->all_chan_mask);
- channel_clear_bit(dw, MASK.DST_TRAN, dw->all_chan_mask);
- channel_clear_bit(dw, MASK.ERROR, dw->all_chan_mask);
-
dma_cap_set(DMA_MEMCPY, dw->dma.cap_mask);
dma_cap_set(DMA_SLAVE, dw->dma.cap_mask);
if (pdata->is_private)
@@ -1523,7 +1505,7 @@ err_kfree:
return err;
}
-static int __exit dw_remove(struct platform_device *pdev)
+static int __devexit dw_remove(struct platform_device *pdev)
{
struct dw_dma *dw = platform_get_drvdata(pdev);
struct dw_dma_chan *dwc, *_dwc;
@@ -1602,7 +1584,7 @@ MODULE_DEVICE_TABLE(of, dw_dma_id_table);
#endif
static struct platform_driver dw_driver = {
- .remove = __exit_p(dw_remove),
+ .remove = __devexit_p(dw_remove),
.shutdown = dw_shutdown,
.driver = {
.name = "dw_dmac",
@@ -1626,4 +1608,4 @@ module_exit(dw_exit);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("Synopsys DesignWare DMA Controller driver");
MODULE_AUTHOR("Haavard Skinnemoen (Atmel)");
-MODULE_AUTHOR("Viresh Kumar <viresh.kumar@st.com>");
+MODULE_AUTHOR("Viresh Kumar <viresh.linux@gmail.com>");
diff --git a/drivers/dma/dw_dmac_regs.h b/drivers/dma/dw_dmac_regs.h
index f298f69ecbf9..50830bee087a 100644
--- a/drivers/dma/dw_dmac_regs.h
+++ b/drivers/dma/dw_dmac_regs.h
@@ -82,7 +82,7 @@ struct dw_dma_regs {
DW_REG(ID);
DW_REG(TEST);
- /* optional encoded params, 0x3c8..0x3 */
+ /* optional encoded params, 0x3c8..0x3f7 */
};
/* Bitfields in CTL_LO */
@@ -219,9 +219,9 @@ static inline struct dw_dma *to_dw_dma(struct dma_device *ddev)
/* LLI == Linked List Item; a.k.a. DMA block descriptor */
struct dw_lli {
/* values that are not changed by hardware */
- dma_addr_t sar;
- dma_addr_t dar;
- dma_addr_t llp; /* chain to next lli */
+ u32 sar;
+ u32 dar;
+ u32 llp; /* chain to next lli */
u32 ctllo;
/* values that may get written back: */
u32 ctlhi;
diff --git a/drivers/dma/imx-sdma.c b/drivers/dma/imx-sdma.c
index fb4f4990f5eb..1dc2a4ad0026 100644
--- a/drivers/dma/imx-sdma.c
+++ b/drivers/dma/imx-sdma.c
@@ -815,8 +815,6 @@ static int sdma_request_channel(struct sdma_channel *sdmac)
init_completion(&sdmac->done);
- sdmac->buf_tail = 0;
-
return 0;
out:
@@ -927,6 +925,8 @@ static struct dma_async_tx_descriptor *sdma_prep_slave_sg(
sdmac->flags = 0;
+ sdmac->buf_tail = 0;
+
dev_dbg(sdma->dev, "setting up %d entries for channel %d.\n",
sg_len, channel);
@@ -1027,6 +1027,8 @@ static struct dma_async_tx_descriptor *sdma_prep_dma_cyclic(
sdmac->status = DMA_IN_PROGRESS;
+ sdmac->buf_tail = 0;
+
sdmac->flags |= IMX_DMA_SG_LOOP;
sdmac->direction = direction;
ret = sdma_load_context(sdmac);
diff --git a/drivers/dma/ipu/ipu_idmac.c b/drivers/dma/ipu/ipu_idmac.c
index 5ec72044ea4c..c7573e50aa14 100644
--- a/drivers/dma/ipu/ipu_idmac.c
+++ b/drivers/dma/ipu/ipu_idmac.c
@@ -1663,7 +1663,6 @@ static void __exit ipu_idmac_exit(struct ipu *ipu)
static int __init ipu_probe(struct platform_device *pdev)
{
- struct ipu_platform_data *pdata = pdev->dev.platform_data;
struct resource *mem_ipu, *mem_ic;
int ret;
@@ -1671,7 +1670,7 @@ static int __init ipu_probe(struct platform_device *pdev)
mem_ipu = platform_get_resource(pdev, IORESOURCE_MEM, 0);
mem_ic = platform_get_resource(pdev, IORESOURCE_MEM, 1);
- if (!pdata || !mem_ipu || !mem_ic)
+ if (!mem_ipu || !mem_ic)
return -EINVAL;
ipu_data.dev = &pdev->dev;
@@ -1688,10 +1687,9 @@ static int __init ipu_probe(struct platform_device *pdev)
goto err_noirq;
ipu_data.irq_err = ret;
- ipu_data.irq_base = pdata->irq_base;
- dev_dbg(&pdev->dev, "fn irq %u, err irq %u, irq-base %u\n",
- ipu_data.irq_fn, ipu_data.irq_err, ipu_data.irq_base);
+ dev_dbg(&pdev->dev, "fn irq %u, err irq %u\n",
+ ipu_data.irq_fn, ipu_data.irq_err);
/* Remap IPU common registers */
ipu_data.reg_ipu = ioremap(mem_ipu->start, resource_size(mem_ipu));
diff --git a/drivers/dma/ipu/ipu_irq.c b/drivers/dma/ipu/ipu_irq.c
index a71f55e72be9..fa95bcc3de1f 100644
--- a/drivers/dma/ipu/ipu_irq.c
+++ b/drivers/dma/ipu/ipu_irq.c
@@ -14,6 +14,7 @@
#include <linux/clk.h>
#include <linux/irq.h>
#include <linux/io.h>
+#include <linux/module.h>
#include <mach/ipu.h>
@@ -354,10 +355,12 @@ static struct irq_chip ipu_irq_chip = {
/* Install the IRQ handler */
int __init ipu_irq_attach_irq(struct ipu *ipu, struct platform_device *dev)
{
- struct ipu_platform_data *pdata = dev->dev.platform_data;
- unsigned int irq, irq_base, i;
+ unsigned int irq, i;
+ int irq_base = irq_alloc_descs(-1, 0, CONFIG_MX3_IPU_IRQS,
+ numa_node_id());
- irq_base = pdata->irq_base;
+ if (irq_base < 0)
+ return irq_base;
for (i = 0; i < IPU_IRQ_NR_BANKS; i++)
irq_bank[i].ipu = ipu;
@@ -387,15 +390,16 @@ int __init ipu_irq_attach_irq(struct ipu *ipu, struct platform_device *dev)
irq_set_handler_data(ipu->irq_err, ipu);
irq_set_chained_handler(ipu->irq_err, ipu_irq_err);
+ ipu->irq_base = irq_base;
+
return 0;
}
void ipu_irq_detach_irq(struct ipu *ipu, struct platform_device *dev)
{
- struct ipu_platform_data *pdata = dev->dev.platform_data;
unsigned int irq, irq_base;
- irq_base = pdata->irq_base;
+ irq_base = ipu->irq_base;
irq_set_chained_handler(ipu->irq_fn, NULL);
irq_set_handler_data(ipu->irq_fn, NULL);
diff --git a/drivers/dma/mmp_tdma.c b/drivers/dma/mmp_tdma.c
new file mode 100644
index 000000000000..8a15cf2163dc
--- /dev/null
+++ b/drivers/dma/mmp_tdma.c
@@ -0,0 +1,610 @@
+/*
+ * Driver For Marvell Two-channel DMA Engine
+ *
+ * Copyright: Marvell International Ltd.
+ *
+ * The code contained herein is licensed under the GNU General Public
+ * License. You may obtain a copy of the GNU General Public License
+ * Version 2 or later at the following locations:
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/interrupt.h>
+#include <linux/dma-mapping.h>
+#include <linux/slab.h>
+#include <linux/dmaengine.h>
+#include <linux/platform_device.h>
+#include <linux/device.h>
+#include <mach/regs-icu.h>
+#include <mach/sram.h>
+
+#include "dmaengine.h"
+
+/*
+ * Two-Channel DMA registers
+ */
+#define TDBCR 0x00 /* Byte Count */
+#define TDSAR 0x10 /* Src Addr */
+#define TDDAR 0x20 /* Dst Addr */
+#define TDNDPR 0x30 /* Next Desc */
+#define TDCR 0x40 /* Control */
+#define TDCP 0x60 /* Priority*/
+#define TDCDPR 0x70 /* Current Desc */
+#define TDIMR 0x80 /* Int Mask */
+#define TDISR 0xa0 /* Int Status */
+
+/* Two-Channel DMA Control Register */
+#define TDCR_SSZ_8_BITS (0x0 << 22) /* Sample Size */
+#define TDCR_SSZ_12_BITS (0x1 << 22)
+#define TDCR_SSZ_16_BITS (0x2 << 22)
+#define TDCR_SSZ_20_BITS (0x3 << 22)
+#define TDCR_SSZ_24_BITS (0x4 << 22)
+#define TDCR_SSZ_32_BITS (0x5 << 22)
+#define TDCR_SSZ_SHIFT (0x1 << 22)
+#define TDCR_SSZ_MASK (0x7 << 22)
+#define TDCR_SSPMOD (0x1 << 21) /* SSP MOD */
+#define TDCR_ABR (0x1 << 20) /* Channel Abort */
+#define TDCR_CDE (0x1 << 17) /* Close Desc Enable */
+#define TDCR_PACKMOD (0x1 << 16) /* Pack Mode (ADMA Only) */
+#define TDCR_CHANACT (0x1 << 14) /* Channel Active */
+#define TDCR_FETCHND (0x1 << 13) /* Fetch Next Desc */
+#define TDCR_CHANEN (0x1 << 12) /* Channel Enable */
+#define TDCR_INTMODE (0x1 << 10) /* Interrupt Mode */
+#define TDCR_CHAINMOD (0x1 << 9) /* Chain Mode */
+#define TDCR_BURSTSZ_MSK (0x7 << 6) /* Burst Size */
+#define TDCR_BURSTSZ_4B (0x0 << 6)
+#define TDCR_BURSTSZ_8B (0x1 << 6)
+#define TDCR_BURSTSZ_16B (0x3 << 6)
+#define TDCR_BURSTSZ_32B (0x6 << 6)
+#define TDCR_BURSTSZ_64B (0x7 << 6)
+#define TDCR_BURSTSZ_SQU_32B (0x7 << 6)
+#define TDCR_BURSTSZ_128B (0x5 << 6)
+#define TDCR_DSTDIR_MSK (0x3 << 4) /* Dst Direction */
+#define TDCR_DSTDIR_ADDR_HOLD (0x2 << 4) /* Dst Addr Hold */
+#define TDCR_DSTDIR_ADDR_INC (0x0 << 4) /* Dst Addr Increment */
+#define TDCR_SRCDIR_MSK (0x3 << 2) /* Src Direction */
+#define TDCR_SRCDIR_ADDR_HOLD (0x2 << 2) /* Src Addr Hold */
+#define TDCR_SRCDIR_ADDR_INC (0x0 << 2) /* Src Addr Increment */
+#define TDCR_DSTDESCCONT (0x1 << 1)
+#define TDCR_SRCDESTCONT (0x1 << 0)
+
+/* Two-Channel DMA Int Mask Register */
+#define TDIMR_COMP (0x1 << 0)
+
+/* Two-Channel DMA Int Status Register */
+#define TDISR_COMP (0x1 << 0)
+
+/*
+ * Two-Channel DMA Descriptor Struct
+ * NOTE: desc's buf must be aligned to 16 bytes.
+ */
+struct mmp_tdma_desc {
+ u32 byte_cnt;
+ u32 src_addr;
+ u32 dst_addr;
+ u32 nxt_desc;
+};
+
+enum mmp_tdma_type {
+ MMP_AUD_TDMA = 0,
+ PXA910_SQU,
+};
+
+#define TDMA_ALIGNMENT 3
+#define TDMA_MAX_XFER_BYTES SZ_64K
+
+struct mmp_tdma_chan {
+ struct device *dev;
+ struct dma_chan chan;
+ struct dma_async_tx_descriptor desc;
+ struct tasklet_struct tasklet;
+
+ struct mmp_tdma_desc *desc_arr;
+ phys_addr_t desc_arr_phys;
+ int desc_num;
+ enum dma_transfer_direction dir;
+ dma_addr_t dev_addr;
+ u32 burst_sz;
+ enum dma_slave_buswidth buswidth;
+ enum dma_status status;
+
+ int idx;
+ enum mmp_tdma_type type;
+ int irq;
+ unsigned long reg_base;
+
+ size_t buf_len;
+ size_t period_len;
+ size_t pos;
+};
+
+#define TDMA_CHANNEL_NUM 2
+struct mmp_tdma_device {
+ struct device *dev;
+ void __iomem *base;
+ struct dma_device device;
+ struct mmp_tdma_chan *tdmac[TDMA_CHANNEL_NUM];
+ int irq;
+};
+
+#define to_mmp_tdma_chan(dchan) container_of(dchan, struct mmp_tdma_chan, chan)
+
+static void mmp_tdma_chan_set_desc(struct mmp_tdma_chan *tdmac, dma_addr_t phys)
+{
+ writel(phys, tdmac->reg_base + TDNDPR);
+ writel(readl(tdmac->reg_base + TDCR) | TDCR_FETCHND,
+ tdmac->reg_base + TDCR);
+}
+
+static void mmp_tdma_enable_chan(struct mmp_tdma_chan *tdmac)
+{
+ /* enable irq */
+ writel(TDIMR_COMP, tdmac->reg_base + TDIMR);
+ /* enable dma chan */
+ writel(readl(tdmac->reg_base + TDCR) | TDCR_CHANEN,
+ tdmac->reg_base + TDCR);
+ tdmac->status = DMA_IN_PROGRESS;
+}
+
+static void mmp_tdma_disable_chan(struct mmp_tdma_chan *tdmac)
+{
+ writel(readl(tdmac->reg_base + TDCR) & ~TDCR_CHANEN,
+ tdmac->reg_base + TDCR);
+ tdmac->status = DMA_SUCCESS;
+}
+
+static void mmp_tdma_resume_chan(struct mmp_tdma_chan *tdmac)
+{
+ writel(readl(tdmac->reg_base + TDCR) | TDCR_CHANEN,
+ tdmac->reg_base + TDCR);
+ tdmac->status = DMA_IN_PROGRESS;
+}
+
+static void mmp_tdma_pause_chan(struct mmp_tdma_chan *tdmac)
+{
+ writel(readl(tdmac->reg_base + TDCR) & ~TDCR_CHANEN,
+ tdmac->reg_base + TDCR);
+ tdmac->status = DMA_PAUSED;
+}
+
+static int mmp_tdma_config_chan(struct mmp_tdma_chan *tdmac)
+{
+ unsigned int tdcr;
+
+ mmp_tdma_disable_chan(tdmac);
+
+ if (tdmac->dir == DMA_MEM_TO_DEV)
+ tdcr = TDCR_DSTDIR_ADDR_HOLD | TDCR_SRCDIR_ADDR_INC;
+ else if (tdmac->dir == DMA_DEV_TO_MEM)
+ tdcr = TDCR_SRCDIR_ADDR_HOLD | TDCR_DSTDIR_ADDR_INC;
+
+ if (tdmac->type == MMP_AUD_TDMA) {
+ tdcr |= TDCR_PACKMOD;
+
+ switch (tdmac->burst_sz) {
+ case 4:
+ tdcr |= TDCR_BURSTSZ_4B;
+ break;
+ case 8:
+ tdcr |= TDCR_BURSTSZ_8B;
+ break;
+ case 16:
+ tdcr |= TDCR_BURSTSZ_16B;
+ break;
+ case 32:
+ tdcr |= TDCR_BURSTSZ_32B;
+ break;
+ case 64:
+ tdcr |= TDCR_BURSTSZ_64B;
+ break;
+ case 128:
+ tdcr |= TDCR_BURSTSZ_128B;
+ break;
+ default:
+ dev_err(tdmac->dev, "mmp_tdma: unknown burst size.\n");
+ return -EINVAL;
+ }
+
+ switch (tdmac->buswidth) {
+ case DMA_SLAVE_BUSWIDTH_1_BYTE:
+ tdcr |= TDCR_SSZ_8_BITS;
+ break;
+ case DMA_SLAVE_BUSWIDTH_2_BYTES:
+ tdcr |= TDCR_SSZ_16_BITS;
+ break;
+ case DMA_SLAVE_BUSWIDTH_4_BYTES:
+ tdcr |= TDCR_SSZ_32_BITS;
+ break;
+ default:
+ dev_err(tdmac->dev, "mmp_tdma: unknown bus size.\n");
+ return -EINVAL;
+ }
+ } else if (tdmac->type == PXA910_SQU) {
+ tdcr |= TDCR_BURSTSZ_SQU_32B;
+ tdcr |= TDCR_SSPMOD;
+ }
+
+ writel(tdcr, tdmac->reg_base + TDCR);
+ return 0;
+}
+
+static int mmp_tdma_clear_chan_irq(struct mmp_tdma_chan *tdmac)
+{
+ u32 reg = readl(tdmac->reg_base + TDISR);
+
+ if (reg & TDISR_COMP) {
+ /* clear irq */
+ reg &= ~TDISR_COMP;
+ writel(reg, tdmac->reg_base + TDISR);
+
+ return 0;
+ }
+ return -EAGAIN;
+}
+
+static irqreturn_t mmp_tdma_chan_handler(int irq, void *dev_id)
+{
+ struct mmp_tdma_chan *tdmac = dev_id;
+
+ if (mmp_tdma_clear_chan_irq(tdmac) == 0) {
+ tdmac->pos = (tdmac->pos + tdmac->period_len) % tdmac->buf_len;
+ tasklet_schedule(&tdmac->tasklet);
+ return IRQ_HANDLED;
+ } else
+ return IRQ_NONE;
+}
+
+static irqreturn_t mmp_tdma_int_handler(int irq, void *dev_id)
+{
+ struct mmp_tdma_device *tdev = dev_id;
+ int i, ret;
+ int irq_num = 0;
+
+ for (i = 0; i < TDMA_CHANNEL_NUM; i++) {
+ struct mmp_tdma_chan *tdmac = tdev->tdmac[i];
+
+ ret = mmp_tdma_chan_handler(irq, tdmac);
+ if (ret == IRQ_HANDLED)
+ irq_num++;
+ }
+
+ if (irq_num)
+ return IRQ_HANDLED;
+ else
+ return IRQ_NONE;
+}
+
+static void dma_do_tasklet(unsigned long data)
+{
+ struct mmp_tdma_chan *tdmac = (struct mmp_tdma_chan *)data;
+
+ if (tdmac->desc.callback)
+ tdmac->desc.callback(tdmac->desc.callback_param);
+
+}
+
+static void mmp_tdma_free_descriptor(struct mmp_tdma_chan *tdmac)
+{
+ struct gen_pool *gpool;
+ int size = tdmac->desc_num * sizeof(struct mmp_tdma_desc);
+
+ gpool = sram_get_gpool("asram");
+ if (tdmac->desc_arr)
+ gen_pool_free(gpool, (unsigned long)tdmac->desc_arr,
+ size);
+ tdmac->desc_arr = NULL;
+
+ return;
+}
+
+static dma_cookie_t mmp_tdma_tx_submit(struct dma_async_tx_descriptor *tx)
+{
+ struct mmp_tdma_chan *tdmac = to_mmp_tdma_chan(tx->chan);
+
+ mmp_tdma_chan_set_desc(tdmac, tdmac->desc_arr_phys);
+
+ return 0;
+}
+
+static int mmp_tdma_alloc_chan_resources(struct dma_chan *chan)
+{
+ struct mmp_tdma_chan *tdmac = to_mmp_tdma_chan(chan);
+ int ret;
+
+ dma_async_tx_descriptor_init(&tdmac->desc, chan);
+ tdmac->desc.tx_submit = mmp_tdma_tx_submit;
+
+ if (tdmac->irq) {
+ ret = devm_request_irq(tdmac->dev, tdmac->irq,
+ mmp_tdma_chan_handler, IRQF_DISABLED, "tdma", tdmac);
+ if (ret)
+ return ret;
+ }
+ return 1;
+}
+
+static void mmp_tdma_free_chan_resources(struct dma_chan *chan)
+{
+ struct mmp_tdma_chan *tdmac = to_mmp_tdma_chan(chan);
+
+ if (tdmac->irq)
+ devm_free_irq(tdmac->dev, tdmac->irq, tdmac);
+ mmp_tdma_free_descriptor(tdmac);
+ return;
+}
+
+struct mmp_tdma_desc *mmp_tdma_alloc_descriptor(struct mmp_tdma_chan *tdmac)
+{
+ struct gen_pool *gpool;
+ int size = tdmac->desc_num * sizeof(struct mmp_tdma_desc);
+
+ gpool = sram_get_gpool("asram");
+ if (!gpool)
+ return NULL;
+
+ tdmac->desc_arr = (void *)gen_pool_alloc(gpool, size);
+ if (!tdmac->desc_arr)
+ return NULL;
+
+ tdmac->desc_arr_phys = gen_pool_virt_to_phys(gpool,
+ (unsigned long)tdmac->desc_arr);
+
+ return tdmac->desc_arr;
+}
+
+static struct dma_async_tx_descriptor *mmp_tdma_prep_dma_cyclic(
+ struct dma_chan *chan, dma_addr_t dma_addr, size_t buf_len,
+ size_t period_len, enum dma_transfer_direction direction,
+ void *context)
+{
+ struct mmp_tdma_chan *tdmac = to_mmp_tdma_chan(chan);
+ struct mmp_tdma_desc *desc;
+ int num_periods = buf_len / period_len;
+ int i = 0, buf = 0;
+
+ if (tdmac->status != DMA_SUCCESS)
+ return NULL;
+
+ if (period_len > TDMA_MAX_XFER_BYTES) {
+ dev_err(tdmac->dev,
+ "maximum period size exceeded: %d > %d\n",
+ period_len, TDMA_MAX_XFER_BYTES);
+ goto err_out;
+ }
+
+ tdmac->status = DMA_IN_PROGRESS;
+ tdmac->desc_num = num_periods;
+ desc = mmp_tdma_alloc_descriptor(tdmac);
+ if (!desc)
+ goto err_out;
+
+ while (buf < buf_len) {
+ desc = &tdmac->desc_arr[i];
+
+ if (i + 1 == num_periods)
+ desc->nxt_desc = tdmac->desc_arr_phys;
+ else
+ desc->nxt_desc = tdmac->desc_arr_phys +
+ sizeof(*desc) * (i + 1);
+
+ if (direction == DMA_MEM_TO_DEV) {
+ desc->src_addr = dma_addr;
+ desc->dst_addr = tdmac->dev_addr;
+ } else {
+ desc->src_addr = tdmac->dev_addr;
+ desc->dst_addr = dma_addr;
+ }
+ desc->byte_cnt = period_len;
+ dma_addr += period_len;
+ buf += period_len;
+ i++;
+ }
+
+ tdmac->buf_len = buf_len;
+ tdmac->period_len = period_len;
+ tdmac->pos = 0;
+
+ return &tdmac->desc;
+
+err_out:
+ tdmac->status = DMA_ERROR;
+ return NULL;
+}
+
+static int mmp_tdma_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd,
+ unsigned long arg)
+{
+ struct mmp_tdma_chan *tdmac = to_mmp_tdma_chan(chan);
+ struct dma_slave_config *dmaengine_cfg = (void *)arg;
+ int ret = 0;
+
+ switch (cmd) {
+ case DMA_TERMINATE_ALL:
+ mmp_tdma_disable_chan(tdmac);
+ break;
+ case DMA_PAUSE:
+ mmp_tdma_pause_chan(tdmac);
+ break;
+ case DMA_RESUME:
+ mmp_tdma_resume_chan(tdmac);
+ break;
+ case DMA_SLAVE_CONFIG:
+ if (dmaengine_cfg->direction == DMA_DEV_TO_MEM) {
+ tdmac->dev_addr = dmaengine_cfg->src_addr;
+ tdmac->burst_sz = dmaengine_cfg->src_maxburst;
+ tdmac->buswidth = dmaengine_cfg->src_addr_width;
+ } else {
+ tdmac->dev_addr = dmaengine_cfg->dst_addr;
+ tdmac->burst_sz = dmaengine_cfg->dst_maxburst;
+ tdmac->buswidth = dmaengine_cfg->dst_addr_width;
+ }
+ tdmac->dir = dmaengine_cfg->direction;
+ return mmp_tdma_config_chan(tdmac);
+ default:
+ ret = -ENOSYS;
+ }
+
+ return ret;
+}
+
+static enum dma_status mmp_tdma_tx_status(struct dma_chan *chan,
+ dma_cookie_t cookie, struct dma_tx_state *txstate)
+{
+ struct mmp_tdma_chan *tdmac = to_mmp_tdma_chan(chan);
+
+ dma_set_residue(txstate, tdmac->buf_len - tdmac->pos);
+
+ return tdmac->status;
+}
+
+static void mmp_tdma_issue_pending(struct dma_chan *chan)
+{
+ struct mmp_tdma_chan *tdmac = to_mmp_tdma_chan(chan);
+
+ mmp_tdma_enable_chan(tdmac);
+}
+
+static int __devexit mmp_tdma_remove(struct platform_device *pdev)
+{
+ struct mmp_tdma_device *tdev = platform_get_drvdata(pdev);
+
+ dma_async_device_unregister(&tdev->device);
+ return 0;
+}
+
+static int __devinit mmp_tdma_chan_init(struct mmp_tdma_device *tdev,
+ int idx, int irq, int type)
+{
+ struct mmp_tdma_chan *tdmac;
+
+ if (idx >= TDMA_CHANNEL_NUM) {
+ dev_err(tdev->dev, "too many channels for device!\n");
+ return -EINVAL;
+ }
+
+ /* alloc channel */
+ tdmac = devm_kzalloc(tdev->dev, sizeof(*tdmac), GFP_KERNEL);
+ if (!tdmac) {
+ dev_err(tdev->dev, "no free memory for DMA channels!\n");
+ return -ENOMEM;
+ }
+ if (irq)
+ tdmac->irq = irq + idx;
+ tdmac->dev = tdev->dev;
+ tdmac->chan.device = &tdev->device;
+ tdmac->idx = idx;
+ tdmac->type = type;
+ tdmac->reg_base = (unsigned long)tdev->base + idx * 4;
+ tdmac->status = DMA_SUCCESS;
+ tdev->tdmac[tdmac->idx] = tdmac;
+ tasklet_init(&tdmac->tasklet, dma_do_tasklet, (unsigned long)tdmac);
+
+ /* add the channel to tdma_chan list */
+ list_add_tail(&tdmac->chan.device_node,
+ &tdev->device.channels);
+
+ return 0;
+}
+
+static int __devinit mmp_tdma_probe(struct platform_device *pdev)
+{
+ const struct platform_device_id *id = platform_get_device_id(pdev);
+ enum mmp_tdma_type type = id->driver_data;
+ struct mmp_tdma_device *tdev;
+ struct resource *iores;
+ int i, ret;
+ int irq = 0;
+ int chan_num = TDMA_CHANNEL_NUM;
+
+ /* always have couple channels */
+ tdev = devm_kzalloc(&pdev->dev, sizeof(*tdev), GFP_KERNEL);
+ if (!tdev)
+ return -ENOMEM;
+
+ tdev->dev = &pdev->dev;
+ iores = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
+ if (!iores)
+ return -EINVAL;
+
+ if (resource_size(iores) != chan_num)
+ tdev->irq = iores->start;
+ else
+ irq = iores->start;
+
+ iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!iores)
+ return -EINVAL;
+
+ tdev->base = devm_request_and_ioremap(&pdev->dev, iores);
+ if (!tdev->base)
+ return -EADDRNOTAVAIL;
+
+ if (tdev->irq) {
+ ret = devm_request_irq(&pdev->dev, tdev->irq,
+ mmp_tdma_int_handler, IRQF_DISABLED, "tdma", tdev);
+ if (ret)
+ return ret;
+ }
+
+ dma_cap_set(DMA_SLAVE, tdev->device.cap_mask);
+ dma_cap_set(DMA_CYCLIC, tdev->device.cap_mask);
+
+ INIT_LIST_HEAD(&tdev->device.channels);
+
+ /* initialize channel parameters */
+ for (i = 0; i < chan_num; i++) {
+ ret = mmp_tdma_chan_init(tdev, i, irq, type);
+ if (ret)
+ return ret;
+ }
+
+ tdev->device.dev = &pdev->dev;
+ tdev->device.device_alloc_chan_resources =
+ mmp_tdma_alloc_chan_resources;
+ tdev->device.device_free_chan_resources =
+ mmp_tdma_free_chan_resources;
+ tdev->device.device_prep_dma_cyclic = mmp_tdma_prep_dma_cyclic;
+ tdev->device.device_tx_status = mmp_tdma_tx_status;
+ tdev->device.device_issue_pending = mmp_tdma_issue_pending;
+ tdev->device.device_control = mmp_tdma_control;
+ tdev->device.copy_align = TDMA_ALIGNMENT;
+
+ dma_set_mask(&pdev->dev, DMA_BIT_MASK(64));
+ platform_set_drvdata(pdev, tdev);
+
+ ret = dma_async_device_register(&tdev->device);
+ if (ret) {
+ dev_err(tdev->device.dev, "unable to register\n");
+ return ret;
+ }
+
+ dev_info(tdev->device.dev, "initialized\n");
+ return 0;
+}
+
+static const struct platform_device_id mmp_tdma_id_table[] = {
+ { "mmp-adma", MMP_AUD_TDMA },
+ { "pxa910-squ", PXA910_SQU },
+ { },
+};
+
+static struct platform_driver mmp_tdma_driver = {
+ .driver = {
+ .name = "mmp-tdma",
+ .owner = THIS_MODULE,
+ },
+ .id_table = mmp_tdma_id_table,
+ .probe = mmp_tdma_probe,
+ .remove = __devexit_p(mmp_tdma_remove),
+};
+
+module_platform_driver(mmp_tdma_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("MMP Two-Channel DMA Driver");
+MODULE_ALIAS("platform:mmp-tdma");
+MODULE_AUTHOR("Leo Yan <leoy@marvell.com>");
+MODULE_AUTHOR("Zhangfei Gao <zhangfei.gao@marvell.com>");
diff --git a/drivers/dma/mxs-dma.c b/drivers/dma/mxs-dma.c
index c96ab15319f2..7f41b25805fa 100644
--- a/drivers/dma/mxs-dma.c
+++ b/drivers/dma/mxs-dma.c
@@ -29,7 +29,6 @@
#include <linux/of_device.h>
#include <asm/irq.h>
-#include <mach/mxs.h>
#include "dmaengine.h"
@@ -201,6 +200,7 @@ int mxs_dma_is_apbh(struct dma_chan *chan)
return dma_is_apbh(mxs_dma);
}
+EXPORT_SYMBOL_GPL(mxs_dma_is_apbh);
int mxs_dma_is_apbx(struct dma_chan *chan)
{
@@ -209,6 +209,7 @@ int mxs_dma_is_apbx(struct dma_chan *chan)
return !dma_is_apbh(mxs_dma);
}
+EXPORT_SYMBOL_GPL(mxs_dma_is_apbx);
static void mxs_dma_reset_chan(struct mxs_dma_chan *mxs_chan)
{
diff --git a/drivers/dma/pl330.c b/drivers/dma/pl330.c
index cbcc28e79be6..e4feba6b03c0 100644
--- a/drivers/dma/pl330.c
+++ b/drivers/dma/pl330.c
@@ -392,6 +392,8 @@ struct pl330_req {
struct pl330_reqcfg *cfg;
/* Pointer to first xfer in the request. */
struct pl330_xfer *x;
+ /* Hook to attach to DMAC's list of reqs with due callback */
+ struct list_head rqd;
};
/*
@@ -461,8 +463,6 @@ struct _pl330_req {
/* Number of bytes taken to setup MC for the req */
u32 mc_len;
struct pl330_req *r;
- /* Hook to attach to DMAC's list of reqs with due callback */
- struct list_head rqd;
};
/* ToBeDone for tasklet */
@@ -1683,7 +1683,7 @@ static void pl330_dotask(unsigned long data)
/* Returns 1 if state was updated, 0 otherwise */
static int pl330_update(const struct pl330_info *pi)
{
- struct _pl330_req *rqdone;
+ struct pl330_req *rqdone, *tmp;
struct pl330_dmac *pl330;
unsigned long flags;
void __iomem *regs;
@@ -1750,7 +1750,10 @@ static int pl330_update(const struct pl330_info *pi)
if (active == -1) /* Aborted */
continue;
- rqdone = &thrd->req[active];
+ /* Detach the req */
+ rqdone = thrd->req[active].r;
+ thrd->req[active].r = NULL;
+
mark_free(thrd, active);
/* Get going again ASAP */
@@ -1762,20 +1765,11 @@ static int pl330_update(const struct pl330_info *pi)
}
/* Now that we are in no hurry, do the callbacks */
- while (!list_empty(&pl330->req_done)) {
- struct pl330_req *r;
-
- rqdone = container_of(pl330->req_done.next,
- struct _pl330_req, rqd);
-
- list_del_init(&rqdone->rqd);
-
- /* Detach the req */
- r = rqdone->r;
- rqdone->r = NULL;
+ list_for_each_entry_safe(rqdone, tmp, &pl330->req_done, rqd) {
+ list_del(&rqdone->rqd);
spin_unlock_irqrestore(&pl330->lock, flags);
- _callback(r, PL330_ERR_NONE);
+ _callback(rqdone, PL330_ERR_NONE);
spin_lock_irqsave(&pl330->lock, flags);
}
@@ -2321,7 +2315,7 @@ static void pl330_tasklet(unsigned long data)
/* Pick up ripe tomatoes */
list_for_each_entry_safe(desc, _dt, &pch->work_list, node)
if (desc->status == DONE) {
- if (pch->cyclic)
+ if (!pch->cyclic)
dma_cookie_complete(&desc->txd);
list_move_tail(&desc->node, &list);
}
@@ -2539,7 +2533,7 @@ static inline void _init_desc(struct dma_pl330_desc *desc)
}
/* Returns the number of descriptors added to the DMAC pool */
-int add_desc(struct dma_pl330_dmac *pdmac, gfp_t flg, int count)
+static int add_desc(struct dma_pl330_dmac *pdmac, gfp_t flg, int count)
{
struct dma_pl330_desc *desc;
unsigned long flags;
diff --git a/drivers/dma/sh/Makefile b/drivers/dma/sh/Makefile
new file mode 100644
index 000000000000..54ae9572b0ac
--- /dev/null
+++ b/drivers/dma/sh/Makefile
@@ -0,0 +1,2 @@
+obj-$(CONFIG_SH_DMAE) += shdma-base.o
+obj-$(CONFIG_SH_DMAE) += shdma.o
diff --git a/drivers/dma/sh/shdma-base.c b/drivers/dma/sh/shdma-base.c
new file mode 100644
index 000000000000..27f5c781fd73
--- /dev/null
+++ b/drivers/dma/sh/shdma-base.c
@@ -0,0 +1,934 @@
+/*
+ * Dmaengine driver base library for DMA controllers, found on SH-based SoCs
+ *
+ * extracted from shdma.c
+ *
+ * Copyright (C) 2011-2012 Guennadi Liakhovetski <g.liakhovetski@gmx.de>
+ * Copyright (C) 2009 Nobuhiro Iwamatsu <iwamatsu.nobuhiro@renesas.com>
+ * Copyright (C) 2009 Renesas Solutions, Inc. All rights reserved.
+ * Copyright (C) 2007 Freescale Semiconductor, Inc. All rights reserved.
+ *
+ * This is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/delay.h>
+#include <linux/shdma-base.h>
+#include <linux/dmaengine.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/pm_runtime.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+
+#include "../dmaengine.h"
+
+/* DMA descriptor control */
+enum shdma_desc_status {
+ DESC_IDLE,
+ DESC_PREPARED,
+ DESC_SUBMITTED,
+ DESC_COMPLETED, /* completed, have to call callback */
+ DESC_WAITING, /* callback called, waiting for ack / re-submit */
+};
+
+#define NR_DESCS_PER_CHANNEL 32
+
+#define to_shdma_chan(c) container_of(c, struct shdma_chan, dma_chan)
+#define to_shdma_dev(d) container_of(d, struct shdma_dev, dma_dev)
+
+/*
+ * For slave DMA we assume, that there is a finite number of DMA slaves in the
+ * system, and that each such slave can only use a finite number of channels.
+ * We use slave channel IDs to make sure, that no such slave channel ID is
+ * allocated more than once.
+ */
+static unsigned int slave_num = 256;
+module_param(slave_num, uint, 0444);
+
+/* A bitmask with slave_num bits */
+static unsigned long *shdma_slave_used;
+
+/* Called under spin_lock_irq(&schan->chan_lock") */
+static void shdma_chan_xfer_ld_queue(struct shdma_chan *schan)
+{
+ struct shdma_dev *sdev = to_shdma_dev(schan->dma_chan.device);
+ const struct shdma_ops *ops = sdev->ops;
+ struct shdma_desc *sdesc;
+
+ /* DMA work check */
+ if (ops->channel_busy(schan))
+ return;
+
+ /* Find the first not transferred descriptor */
+ list_for_each_entry(sdesc, &schan->ld_queue, node)
+ if (sdesc->mark == DESC_SUBMITTED) {
+ ops->start_xfer(schan, sdesc);
+ break;
+ }
+}
+
+static dma_cookie_t shdma_tx_submit(struct dma_async_tx_descriptor *tx)
+{
+ struct shdma_desc *chunk, *c, *desc =
+ container_of(tx, struct shdma_desc, async_tx),
+ *last = desc;
+ struct shdma_chan *schan = to_shdma_chan(tx->chan);
+ dma_async_tx_callback callback = tx->callback;
+ dma_cookie_t cookie;
+ bool power_up;
+
+ spin_lock_irq(&schan->chan_lock);
+
+ power_up = list_empty(&schan->ld_queue);
+
+ cookie = dma_cookie_assign(tx);
+
+ /* Mark all chunks of this descriptor as submitted, move to the queue */
+ list_for_each_entry_safe(chunk, c, desc->node.prev, node) {
+ /*
+ * All chunks are on the global ld_free, so, we have to find
+ * the end of the chain ourselves
+ */
+ if (chunk != desc && (chunk->mark == DESC_IDLE ||
+ chunk->async_tx.cookie > 0 ||
+ chunk->async_tx.cookie == -EBUSY ||
+ &chunk->node == &schan->ld_free))
+ break;
+ chunk->mark = DESC_SUBMITTED;
+ /* Callback goes to the last chunk */
+ chunk->async_tx.callback = NULL;
+ chunk->cookie = cookie;
+ list_move_tail(&chunk->node, &schan->ld_queue);
+ last = chunk;
+
+ dev_dbg(schan->dev, "submit #%d@%p on %d\n",
+ tx->cookie, &last->async_tx, schan->id);
+ }
+
+ last->async_tx.callback = callback;
+ last->async_tx.callback_param = tx->callback_param;
+
+ if (power_up) {
+ int ret;
+ schan->pm_state = SHDMA_PM_BUSY;
+
+ ret = pm_runtime_get(schan->dev);
+
+ spin_unlock_irq(&schan->chan_lock);
+ if (ret < 0)
+ dev_err(schan->dev, "%s(): GET = %d\n", __func__, ret);
+
+ pm_runtime_barrier(schan->dev);
+
+ spin_lock_irq(&schan->chan_lock);
+
+ /* Have we been reset, while waiting? */
+ if (schan->pm_state != SHDMA_PM_ESTABLISHED) {
+ struct shdma_dev *sdev =
+ to_shdma_dev(schan->dma_chan.device);
+ const struct shdma_ops *ops = sdev->ops;
+ dev_dbg(schan->dev, "Bring up channel %d\n",
+ schan->id);
+ /*
+ * TODO: .xfer_setup() might fail on some platforms.
+ * Make it int then, on error remove chunks from the
+ * queue again
+ */
+ ops->setup_xfer(schan, schan->slave_id);
+
+ if (schan->pm_state == SHDMA_PM_PENDING)
+ shdma_chan_xfer_ld_queue(schan);
+ schan->pm_state = SHDMA_PM_ESTABLISHED;
+ }
+ } else {
+ /*
+ * Tell .device_issue_pending() not to run the queue, interrupts
+ * will do it anyway
+ */
+ schan->pm_state = SHDMA_PM_PENDING;
+ }
+
+ spin_unlock_irq(&schan->chan_lock);
+
+ return cookie;
+}
+
+/* Called with desc_lock held */
+static struct shdma_desc *shdma_get_desc(struct shdma_chan *schan)
+{
+ struct shdma_desc *sdesc;
+
+ list_for_each_entry(sdesc, &schan->ld_free, node)
+ if (sdesc->mark != DESC_PREPARED) {
+ BUG_ON(sdesc->mark != DESC_IDLE);
+ list_del(&sdesc->node);
+ return sdesc;
+ }
+
+ return NULL;
+}
+
+static int shdma_setup_slave(struct shdma_chan *schan, int slave_id)
+{
+ struct shdma_dev *sdev = to_shdma_dev(schan->dma_chan.device);
+ const struct shdma_ops *ops = sdev->ops;
+ int ret;
+
+ if (slave_id < 0 || slave_id >= slave_num)
+ return -EINVAL;
+
+ if (test_and_set_bit(slave_id, shdma_slave_used))
+ return -EBUSY;
+
+ ret = ops->set_slave(schan, slave_id, false);
+ if (ret < 0) {
+ clear_bit(slave_id, shdma_slave_used);
+ return ret;
+ }
+
+ schan->slave_id = slave_id;
+
+ return 0;
+}
+
+/*
+ * This is the standard shdma filter function to be used as a replacement to the
+ * "old" method, using the .private pointer. If for some reason you allocate a
+ * channel without slave data, use something like ERR_PTR(-EINVAL) as a filter
+ * parameter. If this filter is used, the slave driver, after calling
+ * dma_request_channel(), will also have to call dmaengine_slave_config() with
+ * .slave_id, .direction, and either .src_addr or .dst_addr set.
+ * NOTE: this filter doesn't support multiple DMAC drivers with the DMA_SLAVE
+ * capability! If this becomes a requirement, hardware glue drivers, using this
+ * services would have to provide their own filters, which first would check
+ * the device driver, similar to how other DMAC drivers, e.g., sa11x0-dma.c, do
+ * this, and only then, in case of a match, call this common filter.
+ */
+bool shdma_chan_filter(struct dma_chan *chan, void *arg)
+{
+ struct shdma_chan *schan = to_shdma_chan(chan);
+ struct shdma_dev *sdev = to_shdma_dev(schan->dma_chan.device);
+ const struct shdma_ops *ops = sdev->ops;
+ int slave_id = (int)arg;
+ int ret;
+
+ if (slave_id < 0)
+ /* No slave requested - arbitrary channel */
+ return true;
+
+ if (slave_id >= slave_num)
+ return false;
+
+ ret = ops->set_slave(schan, slave_id, true);
+ if (ret < 0)
+ return false;
+
+ return true;
+}
+EXPORT_SYMBOL(shdma_chan_filter);
+
+static int shdma_alloc_chan_resources(struct dma_chan *chan)
+{
+ struct shdma_chan *schan = to_shdma_chan(chan);
+ struct shdma_dev *sdev = to_shdma_dev(schan->dma_chan.device);
+ const struct shdma_ops *ops = sdev->ops;
+ struct shdma_desc *desc;
+ struct shdma_slave *slave = chan->private;
+ int ret, i;
+
+ /*
+ * This relies on the guarantee from dmaengine that alloc_chan_resources
+ * never runs concurrently with itself or free_chan_resources.
+ */
+ if (slave) {
+ /* Legacy mode: .private is set in filter */
+ ret = shdma_setup_slave(schan, slave->slave_id);
+ if (ret < 0)
+ goto esetslave;
+ } else {
+ schan->slave_id = -EINVAL;
+ }
+
+ schan->desc = kcalloc(NR_DESCS_PER_CHANNEL,
+ sdev->desc_size, GFP_KERNEL);
+ if (!schan->desc) {
+ ret = -ENOMEM;
+ goto edescalloc;
+ }
+ schan->desc_num = NR_DESCS_PER_CHANNEL;
+
+ for (i = 0; i < NR_DESCS_PER_CHANNEL; i++) {
+ desc = ops->embedded_desc(schan->desc, i);
+ dma_async_tx_descriptor_init(&desc->async_tx,
+ &schan->dma_chan);
+ desc->async_tx.tx_submit = shdma_tx_submit;
+ desc->mark = DESC_IDLE;
+
+ list_add(&desc->node, &schan->ld_free);
+ }
+
+ return NR_DESCS_PER_CHANNEL;
+
+edescalloc:
+ if (slave)
+esetslave:
+ clear_bit(slave->slave_id, shdma_slave_used);
+ chan->private = NULL;
+ return ret;
+}
+
+static dma_async_tx_callback __ld_cleanup(struct shdma_chan *schan, bool all)
+{
+ struct shdma_desc *desc, *_desc;
+ /* Is the "exposed" head of a chain acked? */
+ bool head_acked = false;
+ dma_cookie_t cookie = 0;
+ dma_async_tx_callback callback = NULL;
+ void *param = NULL;
+ unsigned long flags;
+
+ spin_lock_irqsave(&schan->chan_lock, flags);
+ list_for_each_entry_safe(desc, _desc, &schan->ld_queue, node) {
+ struct dma_async_tx_descriptor *tx = &desc->async_tx;
+
+ BUG_ON(tx->cookie > 0 && tx->cookie != desc->cookie);
+ BUG_ON(desc->mark != DESC_SUBMITTED &&
+ desc->mark != DESC_COMPLETED &&
+ desc->mark != DESC_WAITING);
+
+ /*
+ * queue is ordered, and we use this loop to (1) clean up all
+ * completed descriptors, and to (2) update descriptor flags of
+ * any chunks in a (partially) completed chain
+ */
+ if (!all && desc->mark == DESC_SUBMITTED &&
+ desc->cookie != cookie)
+ break;
+
+ if (tx->cookie > 0)
+ cookie = tx->cookie;
+
+ if (desc->mark == DESC_COMPLETED && desc->chunks == 1) {
+ if (schan->dma_chan.completed_cookie != desc->cookie - 1)
+ dev_dbg(schan->dev,
+ "Completing cookie %d, expected %d\n",
+ desc->cookie,
+ schan->dma_chan.completed_cookie + 1);
+ schan->dma_chan.completed_cookie = desc->cookie;
+ }
+
+ /* Call callback on the last chunk */
+ if (desc->mark == DESC_COMPLETED && tx->callback) {
+ desc->mark = DESC_WAITING;
+ callback = tx->callback;
+ param = tx->callback_param;
+ dev_dbg(schan->dev, "descriptor #%d@%p on %d callback\n",
+ tx->cookie, tx, schan->id);
+ BUG_ON(desc->chunks != 1);
+ break;
+ }
+
+ if (tx->cookie > 0 || tx->cookie == -EBUSY) {
+ if (desc->mark == DESC_COMPLETED) {
+ BUG_ON(tx->cookie < 0);
+ desc->mark = DESC_WAITING;
+ }
+ head_acked = async_tx_test_ack(tx);
+ } else {
+ switch (desc->mark) {
+ case DESC_COMPLETED:
+ desc->mark = DESC_WAITING;
+ /* Fall through */
+ case DESC_WAITING:
+ if (head_acked)
+ async_tx_ack(&desc->async_tx);
+ }
+ }
+
+ dev_dbg(schan->dev, "descriptor %p #%d completed.\n",
+ tx, tx->cookie);
+
+ if (((desc->mark == DESC_COMPLETED ||
+ desc->mark == DESC_WAITING) &&
+ async_tx_test_ack(&desc->async_tx)) || all) {
+ /* Remove from ld_queue list */
+ desc->mark = DESC_IDLE;
+
+ list_move(&desc->node, &schan->ld_free);
+
+ if (list_empty(&schan->ld_queue)) {
+ dev_dbg(schan->dev, "Bring down channel %d\n", schan->id);
+ pm_runtime_put(schan->dev);
+ schan->pm_state = SHDMA_PM_ESTABLISHED;
+ }
+ }
+ }
+
+ if (all && !callback)
+ /*
+ * Terminating and the loop completed normally: forgive
+ * uncompleted cookies
+ */
+ schan->dma_chan.completed_cookie = schan->dma_chan.cookie;
+
+ spin_unlock_irqrestore(&schan->chan_lock, flags);
+
+ if (callback)
+ callback(param);
+
+ return callback;
+}
+
+/*
+ * shdma_chan_ld_cleanup - Clean up link descriptors
+ *
+ * Clean up the ld_queue of DMA channel.
+ */
+static void shdma_chan_ld_cleanup(struct shdma_chan *schan, bool all)
+{
+ while (__ld_cleanup(schan, all))
+ ;
+}
+
+/*
+ * shdma_free_chan_resources - Free all resources of the channel.
+ */
+static void shdma_free_chan_resources(struct dma_chan *chan)
+{
+ struct shdma_chan *schan = to_shdma_chan(chan);
+ struct shdma_dev *sdev = to_shdma_dev(chan->device);
+ const struct shdma_ops *ops = sdev->ops;
+ LIST_HEAD(list);
+
+ /* Protect against ISR */
+ spin_lock_irq(&schan->chan_lock);
+ ops->halt_channel(schan);
+ spin_unlock_irq(&schan->chan_lock);
+
+ /* Now no new interrupts will occur */
+
+ /* Prepared and not submitted descriptors can still be on the queue */
+ if (!list_empty(&schan->ld_queue))
+ shdma_chan_ld_cleanup(schan, true);
+
+ if (schan->slave_id >= 0) {
+ /* The caller is holding dma_list_mutex */
+ clear_bit(schan->slave_id, shdma_slave_used);
+ chan->private = NULL;
+ }
+
+ spin_lock_irq(&schan->chan_lock);
+
+ list_splice_init(&schan->ld_free, &list);
+ schan->desc_num = 0;
+
+ spin_unlock_irq(&schan->chan_lock);
+
+ kfree(schan->desc);
+}
+
+/**
+ * shdma_add_desc - get, set up and return one transfer descriptor
+ * @schan: DMA channel
+ * @flags: DMA transfer flags
+ * @dst: destination DMA address, incremented when direction equals
+ * DMA_DEV_TO_MEM or DMA_MEM_TO_MEM
+ * @src: source DMA address, incremented when direction equals
+ * DMA_MEM_TO_DEV or DMA_MEM_TO_MEM
+ * @len: DMA transfer length
+ * @first: if NULL, set to the current descriptor and cookie set to -EBUSY
+ * @direction: needed for slave DMA to decide which address to keep constant,
+ * equals DMA_MEM_TO_MEM for MEMCPY
+ * Returns 0 or an error
+ * Locks: called with desc_lock held
+ */
+static struct shdma_desc *shdma_add_desc(struct shdma_chan *schan,
+ unsigned long flags, dma_addr_t *dst, dma_addr_t *src, size_t *len,
+ struct shdma_desc **first, enum dma_transfer_direction direction)
+{
+ struct shdma_dev *sdev = to_shdma_dev(schan->dma_chan.device);
+ const struct shdma_ops *ops = sdev->ops;
+ struct shdma_desc *new;
+ size_t copy_size = *len;
+
+ if (!copy_size)
+ return NULL;
+
+ /* Allocate the link descriptor from the free list */
+ new = shdma_get_desc(schan);
+ if (!new) {
+ dev_err(schan->dev, "No free link descriptor available\n");
+ return NULL;
+ }
+
+ ops->desc_setup(schan, new, *src, *dst, &copy_size);
+
+ if (!*first) {
+ /* First desc */
+ new->async_tx.cookie = -EBUSY;
+ *first = new;
+ } else {
+ /* Other desc - invisible to the user */
+ new->async_tx.cookie = -EINVAL;
+ }
+
+ dev_dbg(schan->dev,
+ "chaining (%u/%u)@%x -> %x with %p, cookie %d\n",
+ copy_size, *len, *src, *dst, &new->async_tx,
+ new->async_tx.cookie);
+
+ new->mark = DESC_PREPARED;
+ new->async_tx.flags = flags;
+ new->direction = direction;
+
+ *len -= copy_size;
+ if (direction == DMA_MEM_TO_MEM || direction == DMA_MEM_TO_DEV)
+ *src += copy_size;
+ if (direction == DMA_MEM_TO_MEM || direction == DMA_DEV_TO_MEM)
+ *dst += copy_size;
+
+ return new;
+}
+
+/*
+ * shdma_prep_sg - prepare transfer descriptors from an SG list
+ *
+ * Common routine for public (MEMCPY) and slave DMA. The MEMCPY case is also
+ * converted to scatter-gather to guarantee consistent locking and a correct
+ * list manipulation. For slave DMA direction carries the usual meaning, and,
+ * logically, the SG list is RAM and the addr variable contains slave address,
+ * e.g., the FIFO I/O register. For MEMCPY direction equals DMA_MEM_TO_MEM
+ * and the SG list contains only one element and points at the source buffer.
+ */
+static struct dma_async_tx_descriptor *shdma_prep_sg(struct shdma_chan *schan,
+ struct scatterlist *sgl, unsigned int sg_len, dma_addr_t *addr,
+ enum dma_transfer_direction direction, unsigned long flags)
+{
+ struct scatterlist *sg;
+ struct shdma_desc *first = NULL, *new = NULL /* compiler... */;
+ LIST_HEAD(tx_list);
+ int chunks = 0;
+ unsigned long irq_flags;
+ int i;
+
+ for_each_sg(sgl, sg, sg_len, i)
+ chunks += DIV_ROUND_UP(sg_dma_len(sg), schan->max_xfer_len);
+
+ /* Have to lock the whole loop to protect against concurrent release */
+ spin_lock_irqsave(&schan->chan_lock, irq_flags);
+
+ /*
+ * Chaining:
+ * first descriptor is what user is dealing with in all API calls, its
+ * cookie is at first set to -EBUSY, at tx-submit to a positive
+ * number
+ * if more than one chunk is needed further chunks have cookie = -EINVAL
+ * the last chunk, if not equal to the first, has cookie = -ENOSPC
+ * all chunks are linked onto the tx_list head with their .node heads
+ * only during this function, then they are immediately spliced
+ * back onto the free list in form of a chain
+ */
+ for_each_sg(sgl, sg, sg_len, i) {
+ dma_addr_t sg_addr = sg_dma_address(sg);
+ size_t len = sg_dma_len(sg);
+
+ if (!len)
+ goto err_get_desc;
+
+ do {
+ dev_dbg(schan->dev, "Add SG #%d@%p[%d], dma %llx\n",
+ i, sg, len, (unsigned long long)sg_addr);
+
+ if (direction == DMA_DEV_TO_MEM)
+ new = shdma_add_desc(schan, flags,
+ &sg_addr, addr, &len, &first,
+ direction);
+ else
+ new = shdma_add_desc(schan, flags,
+ addr, &sg_addr, &len, &first,
+ direction);
+ if (!new)
+ goto err_get_desc;
+
+ new->chunks = chunks--;
+ list_add_tail(&new->node, &tx_list);
+ } while (len);
+ }
+
+ if (new != first)
+ new->async_tx.cookie = -ENOSPC;
+
+ /* Put them back on the free list, so, they don't get lost */
+ list_splice_tail(&tx_list, &schan->ld_free);
+
+ spin_unlock_irqrestore(&schan->chan_lock, irq_flags);
+
+ return &first->async_tx;
+
+err_get_desc:
+ list_for_each_entry(new, &tx_list, node)
+ new->mark = DESC_IDLE;
+ list_splice(&tx_list, &schan->ld_free);
+
+ spin_unlock_irqrestore(&schan->chan_lock, irq_flags);
+
+ return NULL;
+}
+
+static struct dma_async_tx_descriptor *shdma_prep_memcpy(
+ struct dma_chan *chan, dma_addr_t dma_dest, dma_addr_t dma_src,
+ size_t len, unsigned long flags)
+{
+ struct shdma_chan *schan = to_shdma_chan(chan);
+ struct scatterlist sg;
+
+ if (!chan || !len)
+ return NULL;
+
+ BUG_ON(!schan->desc_num);
+
+ sg_init_table(&sg, 1);
+ sg_set_page(&sg, pfn_to_page(PFN_DOWN(dma_src)), len,
+ offset_in_page(dma_src));
+ sg_dma_address(&sg) = dma_src;
+ sg_dma_len(&sg) = len;
+
+ return shdma_prep_sg(schan, &sg, 1, &dma_dest, DMA_MEM_TO_MEM, flags);
+}
+
+static struct dma_async_tx_descriptor *shdma_prep_slave_sg(
+ struct dma_chan *chan, struct scatterlist *sgl, unsigned int sg_len,
+ enum dma_transfer_direction direction, unsigned long flags, void *context)
+{
+ struct shdma_chan *schan = to_shdma_chan(chan);
+ struct shdma_dev *sdev = to_shdma_dev(schan->dma_chan.device);
+ const struct shdma_ops *ops = sdev->ops;
+ int slave_id = schan->slave_id;
+ dma_addr_t slave_addr;
+
+ if (!chan)
+ return NULL;
+
+ BUG_ON(!schan->desc_num);
+
+ /* Someone calling slave DMA on a generic channel? */
+ if (slave_id < 0 || !sg_len) {
+ dev_warn(schan->dev, "%s: bad parameter: len=%d, id=%d\n",
+ __func__, sg_len, slave_id);
+ return NULL;
+ }
+
+ slave_addr = ops->slave_addr(schan);
+
+ return shdma_prep_sg(schan, sgl, sg_len, &slave_addr,
+ direction, flags);
+}
+
+static int shdma_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd,
+ unsigned long arg)
+{
+ struct shdma_chan *schan = to_shdma_chan(chan);
+ struct shdma_dev *sdev = to_shdma_dev(chan->device);
+ const struct shdma_ops *ops = sdev->ops;
+ struct dma_slave_config *config;
+ unsigned long flags;
+ int ret;
+
+ if (!chan)
+ return -EINVAL;
+
+ switch (cmd) {
+ case DMA_TERMINATE_ALL:
+ spin_lock_irqsave(&schan->chan_lock, flags);
+ ops->halt_channel(schan);
+ spin_unlock_irqrestore(&schan->chan_lock, flags);
+
+ shdma_chan_ld_cleanup(schan, true);
+ break;
+ case DMA_SLAVE_CONFIG:
+ /*
+ * So far only .slave_id is used, but the slave drivers are
+ * encouraged to also set a transfer direction and an address.
+ */
+ if (!arg)
+ return -EINVAL;
+ /*
+ * We could lock this, but you shouldn't be configuring the
+ * channel, while using it...
+ */
+ config = (struct dma_slave_config *)arg;
+ ret = shdma_setup_slave(schan, config->slave_id);
+ if (ret < 0)
+ return ret;
+ break;
+ default:
+ return -ENXIO;
+ }
+
+ return 0;
+}
+
+static void shdma_issue_pending(struct dma_chan *chan)
+{
+ struct shdma_chan *schan = to_shdma_chan(chan);
+
+ spin_lock_irq(&schan->chan_lock);
+ if (schan->pm_state == SHDMA_PM_ESTABLISHED)
+ shdma_chan_xfer_ld_queue(schan);
+ else
+ schan->pm_state = SHDMA_PM_PENDING;
+ spin_unlock_irq(&schan->chan_lock);
+}
+
+static enum dma_status shdma_tx_status(struct dma_chan *chan,
+ dma_cookie_t cookie,
+ struct dma_tx_state *txstate)
+{
+ struct shdma_chan *schan = to_shdma_chan(chan);
+ enum dma_status status;
+ unsigned long flags;
+
+ shdma_chan_ld_cleanup(schan, false);
+
+ spin_lock_irqsave(&schan->chan_lock, flags);
+
+ status = dma_cookie_status(chan, cookie, txstate);
+
+ /*
+ * If we don't find cookie on the queue, it has been aborted and we have
+ * to report error
+ */
+ if (status != DMA_SUCCESS) {
+ struct shdma_desc *sdesc;
+ status = DMA_ERROR;
+ list_for_each_entry(sdesc, &schan->ld_queue, node)
+ if (sdesc->cookie == cookie) {
+ status = DMA_IN_PROGRESS;
+ break;
+ }
+ }
+
+ spin_unlock_irqrestore(&schan->chan_lock, flags);
+
+ return status;
+}
+
+/* Called from error IRQ or NMI */
+bool shdma_reset(struct shdma_dev *sdev)
+{
+ const struct shdma_ops *ops = sdev->ops;
+ struct shdma_chan *schan;
+ unsigned int handled = 0;
+ int i;
+
+ /* Reset all channels */
+ shdma_for_each_chan(schan, sdev, i) {
+ struct shdma_desc *sdesc;
+ LIST_HEAD(dl);
+
+ if (!schan)
+ continue;
+
+ spin_lock(&schan->chan_lock);
+
+ /* Stop the channel */
+ ops->halt_channel(schan);
+
+ list_splice_init(&schan->ld_queue, &dl);
+
+ if (!list_empty(&dl)) {
+ dev_dbg(schan->dev, "Bring down channel %d\n", schan->id);
+ pm_runtime_put(schan->dev);
+ }
+ schan->pm_state = SHDMA_PM_ESTABLISHED;
+
+ spin_unlock(&schan->chan_lock);
+
+ /* Complete all */
+ list_for_each_entry(sdesc, &dl, node) {
+ struct dma_async_tx_descriptor *tx = &sdesc->async_tx;
+ sdesc->mark = DESC_IDLE;
+ if (tx->callback)
+ tx->callback(tx->callback_param);
+ }
+
+ spin_lock(&schan->chan_lock);
+ list_splice(&dl, &schan->ld_free);
+ spin_unlock(&schan->chan_lock);
+
+ handled++;
+ }
+
+ return !!handled;
+}
+EXPORT_SYMBOL(shdma_reset);
+
+static irqreturn_t chan_irq(int irq, void *dev)
+{
+ struct shdma_chan *schan = dev;
+ const struct shdma_ops *ops =
+ to_shdma_dev(schan->dma_chan.device)->ops;
+ irqreturn_t ret;
+
+ spin_lock(&schan->chan_lock);
+
+ ret = ops->chan_irq(schan, irq) ? IRQ_WAKE_THREAD : IRQ_NONE;
+
+ spin_unlock(&schan->chan_lock);
+
+ return ret;
+}
+
+static irqreturn_t chan_irqt(int irq, void *dev)
+{
+ struct shdma_chan *schan = dev;
+ const struct shdma_ops *ops =
+ to_shdma_dev(schan->dma_chan.device)->ops;
+ struct shdma_desc *sdesc;
+
+ spin_lock_irq(&schan->chan_lock);
+ list_for_each_entry(sdesc, &schan->ld_queue, node) {
+ if (sdesc->mark == DESC_SUBMITTED &&
+ ops->desc_completed(schan, sdesc)) {
+ dev_dbg(schan->dev, "done #%d@%p\n",
+ sdesc->async_tx.cookie, &sdesc->async_tx);
+ sdesc->mark = DESC_COMPLETED;
+ break;
+ }
+ }
+ /* Next desc */
+ shdma_chan_xfer_ld_queue(schan);
+ spin_unlock_irq(&schan->chan_lock);
+
+ shdma_chan_ld_cleanup(schan, false);
+
+ return IRQ_HANDLED;
+}
+
+int shdma_request_irq(struct shdma_chan *schan, int irq,
+ unsigned long flags, const char *name)
+{
+ int ret = request_threaded_irq(irq, chan_irq, chan_irqt,
+ flags, name, schan);
+
+ schan->irq = ret < 0 ? ret : irq;
+
+ return ret;
+}
+EXPORT_SYMBOL(shdma_request_irq);
+
+void shdma_free_irq(struct shdma_chan *schan)
+{
+ if (schan->irq >= 0)
+ free_irq(schan->irq, schan);
+}
+EXPORT_SYMBOL(shdma_free_irq);
+
+void shdma_chan_probe(struct shdma_dev *sdev,
+ struct shdma_chan *schan, int id)
+{
+ schan->pm_state = SHDMA_PM_ESTABLISHED;
+
+ /* reference struct dma_device */
+ schan->dma_chan.device = &sdev->dma_dev;
+ dma_cookie_init(&schan->dma_chan);
+
+ schan->dev = sdev->dma_dev.dev;
+ schan->id = id;
+
+ if (!schan->max_xfer_len)
+ schan->max_xfer_len = PAGE_SIZE;
+
+ spin_lock_init(&schan->chan_lock);
+
+ /* Init descripter manage list */
+ INIT_LIST_HEAD(&schan->ld_queue);
+ INIT_LIST_HEAD(&schan->ld_free);
+
+ /* Add the channel to DMA device channel list */
+ list_add_tail(&schan->dma_chan.device_node,
+ &sdev->dma_dev.channels);
+ sdev->schan[sdev->dma_dev.chancnt++] = schan;
+}
+EXPORT_SYMBOL(shdma_chan_probe);
+
+void shdma_chan_remove(struct shdma_chan *schan)
+{
+ list_del(&schan->dma_chan.device_node);
+}
+EXPORT_SYMBOL(shdma_chan_remove);
+
+int shdma_init(struct device *dev, struct shdma_dev *sdev,
+ int chan_num)
+{
+ struct dma_device *dma_dev = &sdev->dma_dev;
+
+ /*
+ * Require all call-backs for now, they can trivially be made optional
+ * later as required
+ */
+ if (!sdev->ops ||
+ !sdev->desc_size ||
+ !sdev->ops->embedded_desc ||
+ !sdev->ops->start_xfer ||
+ !sdev->ops->setup_xfer ||
+ !sdev->ops->set_slave ||
+ !sdev->ops->desc_setup ||
+ !sdev->ops->slave_addr ||
+ !sdev->ops->channel_busy ||
+ !sdev->ops->halt_channel ||
+ !sdev->ops->desc_completed)
+ return -EINVAL;
+
+ sdev->schan = kcalloc(chan_num, sizeof(*sdev->schan), GFP_KERNEL);
+ if (!sdev->schan)
+ return -ENOMEM;
+
+ INIT_LIST_HEAD(&dma_dev->channels);
+
+ /* Common and MEMCPY operations */
+ dma_dev->device_alloc_chan_resources
+ = shdma_alloc_chan_resources;
+ dma_dev->device_free_chan_resources = shdma_free_chan_resources;
+ dma_dev->device_prep_dma_memcpy = shdma_prep_memcpy;
+ dma_dev->device_tx_status = shdma_tx_status;
+ dma_dev->device_issue_pending = shdma_issue_pending;
+
+ /* Compulsory for DMA_SLAVE fields */
+ dma_dev->device_prep_slave_sg = shdma_prep_slave_sg;
+ dma_dev->device_control = shdma_control;
+
+ dma_dev->dev = dev;
+
+ return 0;
+}
+EXPORT_SYMBOL(shdma_init);
+
+void shdma_cleanup(struct shdma_dev *sdev)
+{
+ kfree(sdev->schan);
+}
+EXPORT_SYMBOL(shdma_cleanup);
+
+static int __init shdma_enter(void)
+{
+ shdma_slave_used = kzalloc(DIV_ROUND_UP(slave_num, BITS_PER_LONG) *
+ sizeof(long), GFP_KERNEL);
+ if (!shdma_slave_used)
+ return -ENOMEM;
+ return 0;
+}
+module_init(shdma_enter);
+
+static void __exit shdma_exit(void)
+{
+ kfree(shdma_slave_used);
+}
+module_exit(shdma_exit);
+
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("SH-DMA driver base library");
+MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>");
diff --git a/drivers/dma/sh/shdma.c b/drivers/dma/sh/shdma.c
new file mode 100644
index 000000000000..027c9be97654
--- /dev/null
+++ b/drivers/dma/sh/shdma.c
@@ -0,0 +1,943 @@
+/*
+ * Renesas SuperH DMA Engine support
+ *
+ * base is drivers/dma/flsdma.c
+ *
+ * Copyright (C) 2011-2012 Guennadi Liakhovetski <g.liakhovetski@gmx.de>
+ * Copyright (C) 2009 Nobuhiro Iwamatsu <iwamatsu.nobuhiro@renesas.com>
+ * Copyright (C) 2009 Renesas Solutions, Inc. All rights reserved.
+ * Copyright (C) 2007 Freescale Semiconductor, Inc. All rights reserved.
+ *
+ * This is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * - DMA of SuperH does not have Hardware DMA chain mode.
+ * - MAX DMA size is 16MB.
+ *
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/interrupt.h>
+#include <linux/dmaengine.h>
+#include <linux/delay.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/sh_dma.h>
+#include <linux/notifier.h>
+#include <linux/kdebug.h>
+#include <linux/spinlock.h>
+#include <linux/rculist.h>
+
+#include "../dmaengine.h"
+#include "shdma.h"
+
+#define SH_DMAE_DRV_NAME "sh-dma-engine"
+
+/* Default MEMCPY transfer size = 2^2 = 4 bytes */
+#define LOG2_DEFAULT_XFER_SIZE 2
+#define SH_DMA_SLAVE_NUMBER 256
+#define SH_DMA_TCR_MAX (16 * 1024 * 1024 - 1)
+
+/*
+ * Used for write-side mutual exclusion for the global device list,
+ * read-side synchronization by way of RCU, and per-controller data.
+ */
+static DEFINE_SPINLOCK(sh_dmae_lock);
+static LIST_HEAD(sh_dmae_devices);
+
+static void chclr_write(struct sh_dmae_chan *sh_dc, u32 data)
+{
+ struct sh_dmae_device *shdev = to_sh_dev(sh_dc);
+
+ __raw_writel(data, shdev->chan_reg +
+ shdev->pdata->channel[sh_dc->shdma_chan.id].chclr_offset);
+}
+
+static void sh_dmae_writel(struct sh_dmae_chan *sh_dc, u32 data, u32 reg)
+{
+ __raw_writel(data, sh_dc->base + reg / sizeof(u32));
+}
+
+static u32 sh_dmae_readl(struct sh_dmae_chan *sh_dc, u32 reg)
+{
+ return __raw_readl(sh_dc->base + reg / sizeof(u32));
+}
+
+static u16 dmaor_read(struct sh_dmae_device *shdev)
+{
+ u32 __iomem *addr = shdev->chan_reg + DMAOR / sizeof(u32);
+
+ if (shdev->pdata->dmaor_is_32bit)
+ return __raw_readl(addr);
+ else
+ return __raw_readw(addr);
+}
+
+static void dmaor_write(struct sh_dmae_device *shdev, u16 data)
+{
+ u32 __iomem *addr = shdev->chan_reg + DMAOR / sizeof(u32);
+
+ if (shdev->pdata->dmaor_is_32bit)
+ __raw_writel(data, addr);
+ else
+ __raw_writew(data, addr);
+}
+
+static void chcr_write(struct sh_dmae_chan *sh_dc, u32 data)
+{
+ struct sh_dmae_device *shdev = to_sh_dev(sh_dc);
+
+ __raw_writel(data, sh_dc->base + shdev->chcr_offset / sizeof(u32));
+}
+
+static u32 chcr_read(struct sh_dmae_chan *sh_dc)
+{
+ struct sh_dmae_device *shdev = to_sh_dev(sh_dc);
+
+ return __raw_readl(sh_dc->base + shdev->chcr_offset / sizeof(u32));
+}
+
+/*
+ * Reset DMA controller
+ *
+ * SH7780 has two DMAOR register
+ */
+static void sh_dmae_ctl_stop(struct sh_dmae_device *shdev)
+{
+ unsigned short dmaor;
+ unsigned long flags;
+
+ spin_lock_irqsave(&sh_dmae_lock, flags);
+
+ dmaor = dmaor_read(shdev);
+ dmaor_write(shdev, dmaor & ~(DMAOR_NMIF | DMAOR_AE | DMAOR_DME));
+
+ spin_unlock_irqrestore(&sh_dmae_lock, flags);
+}
+
+static int sh_dmae_rst(struct sh_dmae_device *shdev)
+{
+ unsigned short dmaor;
+ unsigned long flags;
+
+ spin_lock_irqsave(&sh_dmae_lock, flags);
+
+ dmaor = dmaor_read(shdev) & ~(DMAOR_NMIF | DMAOR_AE | DMAOR_DME);
+
+ if (shdev->pdata->chclr_present) {
+ int i;
+ for (i = 0; i < shdev->pdata->channel_num; i++) {
+ struct sh_dmae_chan *sh_chan = shdev->chan[i];
+ if (sh_chan)
+ chclr_write(sh_chan, 0);
+ }
+ }
+
+ dmaor_write(shdev, dmaor | shdev->pdata->dmaor_init);
+
+ dmaor = dmaor_read(shdev);
+
+ spin_unlock_irqrestore(&sh_dmae_lock, flags);
+
+ if (dmaor & (DMAOR_AE | DMAOR_NMIF)) {
+ dev_warn(shdev->shdma_dev.dma_dev.dev, "Can't initialize DMAOR.\n");
+ return -EIO;
+ }
+ if (shdev->pdata->dmaor_init & ~dmaor)
+ dev_warn(shdev->shdma_dev.dma_dev.dev,
+ "DMAOR=0x%x hasn't latched the initial value 0x%x.\n",
+ dmaor, shdev->pdata->dmaor_init);
+ return 0;
+}
+
+static bool dmae_is_busy(struct sh_dmae_chan *sh_chan)
+{
+ u32 chcr = chcr_read(sh_chan);
+
+ if ((chcr & (CHCR_DE | CHCR_TE)) == CHCR_DE)
+ return true; /* working */
+
+ return false; /* waiting */
+}
+
+static unsigned int calc_xmit_shift(struct sh_dmae_chan *sh_chan, u32 chcr)
+{
+ struct sh_dmae_device *shdev = to_sh_dev(sh_chan);
+ struct sh_dmae_pdata *pdata = shdev->pdata;
+ int cnt = ((chcr & pdata->ts_low_mask) >> pdata->ts_low_shift) |
+ ((chcr & pdata->ts_high_mask) >> pdata->ts_high_shift);
+
+ if (cnt >= pdata->ts_shift_num)
+ cnt = 0;
+
+ return pdata->ts_shift[cnt];
+}
+
+static u32 log2size_to_chcr(struct sh_dmae_chan *sh_chan, int l2size)
+{
+ struct sh_dmae_device *shdev = to_sh_dev(sh_chan);
+ struct sh_dmae_pdata *pdata = shdev->pdata;
+ int i;
+
+ for (i = 0; i < pdata->ts_shift_num; i++)
+ if (pdata->ts_shift[i] == l2size)
+ break;
+
+ if (i == pdata->ts_shift_num)
+ i = 0;
+
+ return ((i << pdata->ts_low_shift) & pdata->ts_low_mask) |
+ ((i << pdata->ts_high_shift) & pdata->ts_high_mask);
+}
+
+static void dmae_set_reg(struct sh_dmae_chan *sh_chan, struct sh_dmae_regs *hw)
+{
+ sh_dmae_writel(sh_chan, hw->sar, SAR);
+ sh_dmae_writel(sh_chan, hw->dar, DAR);
+ sh_dmae_writel(sh_chan, hw->tcr >> sh_chan->xmit_shift, TCR);
+}
+
+static void dmae_start(struct sh_dmae_chan *sh_chan)
+{
+ struct sh_dmae_device *shdev = to_sh_dev(sh_chan);
+ u32 chcr = chcr_read(sh_chan);
+
+ if (shdev->pdata->needs_tend_set)
+ sh_dmae_writel(sh_chan, 0xFFFFFFFF, TEND);
+
+ chcr |= CHCR_DE | shdev->chcr_ie_bit;
+ chcr_write(sh_chan, chcr & ~CHCR_TE);
+}
+
+static void dmae_init(struct sh_dmae_chan *sh_chan)
+{
+ /*
+ * Default configuration for dual address memory-memory transfer.
+ * 0x400 represents auto-request.
+ */
+ u32 chcr = DM_INC | SM_INC | 0x400 | log2size_to_chcr(sh_chan,
+ LOG2_DEFAULT_XFER_SIZE);
+ sh_chan->xmit_shift = calc_xmit_shift(sh_chan, chcr);
+ chcr_write(sh_chan, chcr);
+}
+
+static int dmae_set_chcr(struct sh_dmae_chan *sh_chan, u32 val)
+{
+ /* If DMA is active, cannot set CHCR. TODO: remove this superfluous check */
+ if (dmae_is_busy(sh_chan))
+ return -EBUSY;
+
+ sh_chan->xmit_shift = calc_xmit_shift(sh_chan, val);
+ chcr_write(sh_chan, val);
+
+ return 0;
+}
+
+static int dmae_set_dmars(struct sh_dmae_chan *sh_chan, u16 val)
+{
+ struct sh_dmae_device *shdev = to_sh_dev(sh_chan);
+ struct sh_dmae_pdata *pdata = shdev->pdata;
+ const struct sh_dmae_channel *chan_pdata = &pdata->channel[sh_chan->shdma_chan.id];
+ u16 __iomem *addr = shdev->dmars;
+ unsigned int shift = chan_pdata->dmars_bit;
+
+ if (dmae_is_busy(sh_chan))
+ return -EBUSY;
+
+ if (pdata->no_dmars)
+ return 0;
+
+ /* in the case of a missing DMARS resource use first memory window */
+ if (!addr)
+ addr = (u16 __iomem *)shdev->chan_reg;
+ addr += chan_pdata->dmars / sizeof(u16);
+
+ __raw_writew((__raw_readw(addr) & (0xff00 >> shift)) | (val << shift),
+ addr);
+
+ return 0;
+}
+
+static void sh_dmae_start_xfer(struct shdma_chan *schan,
+ struct shdma_desc *sdesc)
+{
+ struct sh_dmae_chan *sh_chan = container_of(schan, struct sh_dmae_chan,
+ shdma_chan);
+ struct sh_dmae_desc *sh_desc = container_of(sdesc,
+ struct sh_dmae_desc, shdma_desc);
+ dev_dbg(sh_chan->shdma_chan.dev, "Queue #%d to %d: %u@%x -> %x\n",
+ sdesc->async_tx.cookie, sh_chan->shdma_chan.id,
+ sh_desc->hw.tcr, sh_desc->hw.sar, sh_desc->hw.dar);
+ /* Get the ld start address from ld_queue */
+ dmae_set_reg(sh_chan, &sh_desc->hw);
+ dmae_start(sh_chan);
+}
+
+static bool sh_dmae_channel_busy(struct shdma_chan *schan)
+{
+ struct sh_dmae_chan *sh_chan = container_of(schan, struct sh_dmae_chan,
+ shdma_chan);
+ return dmae_is_busy(sh_chan);
+}
+
+static void sh_dmae_setup_xfer(struct shdma_chan *schan,
+ int slave_id)
+{
+ struct sh_dmae_chan *sh_chan = container_of(schan, struct sh_dmae_chan,
+ shdma_chan);
+
+ if (slave_id >= 0) {
+ const struct sh_dmae_slave_config *cfg =
+ sh_chan->config;
+
+ dmae_set_dmars(sh_chan, cfg->mid_rid);
+ dmae_set_chcr(sh_chan, cfg->chcr);
+ } else {
+ dmae_init(sh_chan);
+ }
+}
+
+static const struct sh_dmae_slave_config *dmae_find_slave(
+ struct sh_dmae_chan *sh_chan, int slave_id)
+{
+ struct sh_dmae_device *shdev = to_sh_dev(sh_chan);
+ struct sh_dmae_pdata *pdata = shdev->pdata;
+ const struct sh_dmae_slave_config *cfg;
+ int i;
+
+ if (slave_id >= SH_DMA_SLAVE_NUMBER)
+ return NULL;
+
+ for (i = 0, cfg = pdata->slave; i < pdata->slave_num; i++, cfg++)
+ if (cfg->slave_id == slave_id)
+ return cfg;
+
+ return NULL;
+}
+
+static int sh_dmae_set_slave(struct shdma_chan *schan,
+ int slave_id, bool try)
+{
+ struct sh_dmae_chan *sh_chan = container_of(schan, struct sh_dmae_chan,
+ shdma_chan);
+ const struct sh_dmae_slave_config *cfg = dmae_find_slave(sh_chan, slave_id);
+ if (!cfg)
+ return -ENODEV;
+
+ if (!try)
+ sh_chan->config = cfg;
+
+ return 0;
+}
+
+static void dmae_halt(struct sh_dmae_chan *sh_chan)
+{
+ struct sh_dmae_device *shdev = to_sh_dev(sh_chan);
+ u32 chcr = chcr_read(sh_chan);
+
+ chcr &= ~(CHCR_DE | CHCR_TE | shdev->chcr_ie_bit);
+ chcr_write(sh_chan, chcr);
+}
+
+static int sh_dmae_desc_setup(struct shdma_chan *schan,
+ struct shdma_desc *sdesc,
+ dma_addr_t src, dma_addr_t dst, size_t *len)
+{
+ struct sh_dmae_desc *sh_desc = container_of(sdesc,
+ struct sh_dmae_desc, shdma_desc);
+
+ if (*len > schan->max_xfer_len)
+ *len = schan->max_xfer_len;
+
+ sh_desc->hw.sar = src;
+ sh_desc->hw.dar = dst;
+ sh_desc->hw.tcr = *len;
+
+ return 0;
+}
+
+static void sh_dmae_halt(struct shdma_chan *schan)
+{
+ struct sh_dmae_chan *sh_chan = container_of(schan, struct sh_dmae_chan,
+ shdma_chan);
+ dmae_halt(sh_chan);
+}
+
+static bool sh_dmae_chan_irq(struct shdma_chan *schan, int irq)
+{
+ struct sh_dmae_chan *sh_chan = container_of(schan, struct sh_dmae_chan,
+ shdma_chan);
+
+ if (!(chcr_read(sh_chan) & CHCR_TE))
+ return false;
+
+ /* DMA stop */
+ dmae_halt(sh_chan);
+
+ return true;
+}
+
+/* Called from error IRQ or NMI */
+static bool sh_dmae_reset(struct sh_dmae_device *shdev)
+{
+ bool ret;
+
+ /* halt the dma controller */
+ sh_dmae_ctl_stop(shdev);
+
+ /* We cannot detect, which channel caused the error, have to reset all */
+ ret = shdma_reset(&shdev->shdma_dev);
+
+ sh_dmae_rst(shdev);
+
+ return ret;
+}
+
+static irqreturn_t sh_dmae_err(int irq, void *data)
+{
+ struct sh_dmae_device *shdev = data;
+
+ if (!(dmaor_read(shdev) & DMAOR_AE))
+ return IRQ_NONE;
+
+ sh_dmae_reset(shdev);
+ return IRQ_HANDLED;
+}
+
+static bool sh_dmae_desc_completed(struct shdma_chan *schan,
+ struct shdma_desc *sdesc)
+{
+ struct sh_dmae_chan *sh_chan = container_of(schan,
+ struct sh_dmae_chan, shdma_chan);
+ struct sh_dmae_desc *sh_desc = container_of(sdesc,
+ struct sh_dmae_desc, shdma_desc);
+ u32 sar_buf = sh_dmae_readl(sh_chan, SAR);
+ u32 dar_buf = sh_dmae_readl(sh_chan, DAR);
+
+ return (sdesc->direction == DMA_DEV_TO_MEM &&
+ (sh_desc->hw.dar + sh_desc->hw.tcr) == dar_buf) ||
+ (sdesc->direction != DMA_DEV_TO_MEM &&
+ (sh_desc->hw.sar + sh_desc->hw.tcr) == sar_buf);
+}
+
+static bool sh_dmae_nmi_notify(struct sh_dmae_device *shdev)
+{
+ /* Fast path out if NMIF is not asserted for this controller */
+ if ((dmaor_read(shdev) & DMAOR_NMIF) == 0)
+ return false;
+
+ return sh_dmae_reset(shdev);
+}
+
+static int sh_dmae_nmi_handler(struct notifier_block *self,
+ unsigned long cmd, void *data)
+{
+ struct sh_dmae_device *shdev;
+ int ret = NOTIFY_DONE;
+ bool triggered;
+
+ /*
+ * Only concern ourselves with NMI events.
+ *
+ * Normally we would check the die chain value, but as this needs
+ * to be architecture independent, check for NMI context instead.
+ */
+ if (!in_nmi())
+ return NOTIFY_DONE;
+
+ rcu_read_lock();
+ list_for_each_entry_rcu(shdev, &sh_dmae_devices, node) {
+ /*
+ * Only stop if one of the controllers has NMIF asserted,
+ * we do not want to interfere with regular address error
+ * handling or NMI events that don't concern the DMACs.
+ */
+ triggered = sh_dmae_nmi_notify(shdev);
+ if (triggered == true)
+ ret = NOTIFY_OK;
+ }
+ rcu_read_unlock();
+
+ return ret;
+}
+
+static struct notifier_block sh_dmae_nmi_notifier __read_mostly = {
+ .notifier_call = sh_dmae_nmi_handler,
+
+ /* Run before NMI debug handler and KGDB */
+ .priority = 1,
+};
+
+static int __devinit sh_dmae_chan_probe(struct sh_dmae_device *shdev, int id,
+ int irq, unsigned long flags)
+{
+ const struct sh_dmae_channel *chan_pdata = &shdev->pdata->channel[id];
+ struct shdma_dev *sdev = &shdev->shdma_dev;
+ struct platform_device *pdev = to_platform_device(sdev->dma_dev.dev);
+ struct sh_dmae_chan *sh_chan;
+ struct shdma_chan *schan;
+ int err;
+
+ sh_chan = kzalloc(sizeof(struct sh_dmae_chan), GFP_KERNEL);
+ if (!sh_chan) {
+ dev_err(sdev->dma_dev.dev,
+ "No free memory for allocating dma channels!\n");
+ return -ENOMEM;
+ }
+
+ schan = &sh_chan->shdma_chan;
+ schan->max_xfer_len = SH_DMA_TCR_MAX + 1;
+
+ shdma_chan_probe(sdev, schan, id);
+
+ sh_chan->base = shdev->chan_reg + chan_pdata->offset / sizeof(u32);
+
+ /* set up channel irq */
+ if (pdev->id >= 0)
+ snprintf(sh_chan->dev_id, sizeof(sh_chan->dev_id),
+ "sh-dmae%d.%d", pdev->id, id);
+ else
+ snprintf(sh_chan->dev_id, sizeof(sh_chan->dev_id),
+ "sh-dma%d", id);
+
+ err = shdma_request_irq(schan, irq, flags, sh_chan->dev_id);
+ if (err) {
+ dev_err(sdev->dma_dev.dev,
+ "DMA channel %d request_irq error %d\n",
+ id, err);
+ goto err_no_irq;
+ }
+
+ shdev->chan[id] = sh_chan;
+ return 0;
+
+err_no_irq:
+ /* remove from dmaengine device node */
+ shdma_chan_remove(schan);
+ kfree(sh_chan);
+ return err;
+}
+
+static void sh_dmae_chan_remove(struct sh_dmae_device *shdev)
+{
+ struct dma_device *dma_dev = &shdev->shdma_dev.dma_dev;
+ struct shdma_chan *schan;
+ int i;
+
+ shdma_for_each_chan(schan, &shdev->shdma_dev, i) {
+ struct sh_dmae_chan *sh_chan = container_of(schan,
+ struct sh_dmae_chan, shdma_chan);
+ BUG_ON(!schan);
+
+ shdma_free_irq(&sh_chan->shdma_chan);
+
+ shdma_chan_remove(schan);
+ kfree(sh_chan);
+ }
+ dma_dev->chancnt = 0;
+}
+
+static void sh_dmae_shutdown(struct platform_device *pdev)
+{
+ struct sh_dmae_device *shdev = platform_get_drvdata(pdev);
+ sh_dmae_ctl_stop(shdev);
+}
+
+static int sh_dmae_runtime_suspend(struct device *dev)
+{
+ return 0;
+}
+
+static int sh_dmae_runtime_resume(struct device *dev)
+{
+ struct sh_dmae_device *shdev = dev_get_drvdata(dev);
+
+ return sh_dmae_rst(shdev);
+}
+
+#ifdef CONFIG_PM
+static int sh_dmae_suspend(struct device *dev)
+{
+ return 0;
+}
+
+static int sh_dmae_resume(struct device *dev)
+{
+ struct sh_dmae_device *shdev = dev_get_drvdata(dev);
+ int i, ret;
+
+ ret = sh_dmae_rst(shdev);
+ if (ret < 0)
+ dev_err(dev, "Failed to reset!\n");
+
+ for (i = 0; i < shdev->pdata->channel_num; i++) {
+ struct sh_dmae_chan *sh_chan = shdev->chan[i];
+
+ if (!sh_chan->shdma_chan.desc_num)
+ continue;
+
+ if (sh_chan->shdma_chan.slave_id >= 0) {
+ const struct sh_dmae_slave_config *cfg = sh_chan->config;
+ dmae_set_dmars(sh_chan, cfg->mid_rid);
+ dmae_set_chcr(sh_chan, cfg->chcr);
+ } else {
+ dmae_init(sh_chan);
+ }
+ }
+
+ return 0;
+}
+#else
+#define sh_dmae_suspend NULL
+#define sh_dmae_resume NULL
+#endif
+
+const struct dev_pm_ops sh_dmae_pm = {
+ .suspend = sh_dmae_suspend,
+ .resume = sh_dmae_resume,
+ .runtime_suspend = sh_dmae_runtime_suspend,
+ .runtime_resume = sh_dmae_runtime_resume,
+};
+
+static dma_addr_t sh_dmae_slave_addr(struct shdma_chan *schan)
+{
+ struct sh_dmae_chan *sh_chan = container_of(schan,
+ struct sh_dmae_chan, shdma_chan);
+
+ /*
+ * Implicit BUG_ON(!sh_chan->config)
+ * This is an exclusive slave DMA operation, may only be called after a
+ * successful slave configuration.
+ */
+ return sh_chan->config->addr;
+}
+
+static struct shdma_desc *sh_dmae_embedded_desc(void *buf, int i)
+{
+ return &((struct sh_dmae_desc *)buf)[i].shdma_desc;
+}
+
+static const struct shdma_ops sh_dmae_shdma_ops = {
+ .desc_completed = sh_dmae_desc_completed,
+ .halt_channel = sh_dmae_halt,
+ .channel_busy = sh_dmae_channel_busy,
+ .slave_addr = sh_dmae_slave_addr,
+ .desc_setup = sh_dmae_desc_setup,
+ .set_slave = sh_dmae_set_slave,
+ .setup_xfer = sh_dmae_setup_xfer,
+ .start_xfer = sh_dmae_start_xfer,
+ .embedded_desc = sh_dmae_embedded_desc,
+ .chan_irq = sh_dmae_chan_irq,
+};
+
+static int __devinit sh_dmae_probe(struct platform_device *pdev)
+{
+ struct sh_dmae_pdata *pdata = pdev->dev.platform_data;
+ unsigned long irqflags = IRQF_DISABLED,
+ chan_flag[SH_DMAE_MAX_CHANNELS] = {};
+ int errirq, chan_irq[SH_DMAE_MAX_CHANNELS];
+ int err, i, irq_cnt = 0, irqres = 0, irq_cap = 0;
+ struct sh_dmae_device *shdev;
+ struct dma_device *dma_dev;
+ struct resource *chan, *dmars, *errirq_res, *chanirq_res;
+
+ /* get platform data */
+ if (!pdata || !pdata->channel_num)
+ return -ENODEV;
+
+ chan = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ /* DMARS area is optional */
+ dmars = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+ /*
+ * IRQ resources:
+ * 1. there always must be at least one IRQ IO-resource. On SH4 it is
+ * the error IRQ, in which case it is the only IRQ in this resource:
+ * start == end. If it is the only IRQ resource, all channels also
+ * use the same IRQ.
+ * 2. DMA channel IRQ resources can be specified one per resource or in
+ * ranges (start != end)
+ * 3. iff all events (channels and, optionally, error) on this
+ * controller use the same IRQ, only one IRQ resource can be
+ * specified, otherwise there must be one IRQ per channel, even if
+ * some of them are equal
+ * 4. if all IRQs on this controller are equal or if some specific IRQs
+ * specify IORESOURCE_IRQ_SHAREABLE in their resources, they will be
+ * requested with the IRQF_SHARED flag
+ */
+ errirq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
+ if (!chan || !errirq_res)
+ return -ENODEV;
+
+ if (!request_mem_region(chan->start, resource_size(chan), pdev->name)) {
+ dev_err(&pdev->dev, "DMAC register region already claimed\n");
+ return -EBUSY;
+ }
+
+ if (dmars && !request_mem_region(dmars->start, resource_size(dmars), pdev->name)) {
+ dev_err(&pdev->dev, "DMAC DMARS region already claimed\n");
+ err = -EBUSY;
+ goto ermrdmars;
+ }
+
+ err = -ENOMEM;
+ shdev = kzalloc(sizeof(struct sh_dmae_device), GFP_KERNEL);
+ if (!shdev) {
+ dev_err(&pdev->dev, "Not enough memory\n");
+ goto ealloc;
+ }
+
+ dma_dev = &shdev->shdma_dev.dma_dev;
+
+ shdev->chan_reg = ioremap(chan->start, resource_size(chan));
+ if (!shdev->chan_reg)
+ goto emapchan;
+ if (dmars) {
+ shdev->dmars = ioremap(dmars->start, resource_size(dmars));
+ if (!shdev->dmars)
+ goto emapdmars;
+ }
+
+ if (!pdata->slave_only)
+ dma_cap_set(DMA_MEMCPY, dma_dev->cap_mask);
+ if (pdata->slave && pdata->slave_num)
+ dma_cap_set(DMA_SLAVE, dma_dev->cap_mask);
+
+ /* Default transfer size of 32 bytes requires 32-byte alignment */
+ dma_dev->copy_align = LOG2_DEFAULT_XFER_SIZE;
+
+ shdev->shdma_dev.ops = &sh_dmae_shdma_ops;
+ shdev->shdma_dev.desc_size = sizeof(struct sh_dmae_desc);
+ err = shdma_init(&pdev->dev, &shdev->shdma_dev,
+ pdata->channel_num);
+ if (err < 0)
+ goto eshdma;
+
+ /* platform data */
+ shdev->pdata = pdev->dev.platform_data;
+
+ if (pdata->chcr_offset)
+ shdev->chcr_offset = pdata->chcr_offset;
+ else
+ shdev->chcr_offset = CHCR;
+
+ if (pdata->chcr_ie_bit)
+ shdev->chcr_ie_bit = pdata->chcr_ie_bit;
+ else
+ shdev->chcr_ie_bit = CHCR_IE;
+
+ platform_set_drvdata(pdev, shdev);
+
+ pm_runtime_enable(&pdev->dev);
+ err = pm_runtime_get_sync(&pdev->dev);
+ if (err < 0)
+ dev_err(&pdev->dev, "%s(): GET = %d\n", __func__, err);
+
+ spin_lock_irq(&sh_dmae_lock);
+ list_add_tail_rcu(&shdev->node, &sh_dmae_devices);
+ spin_unlock_irq(&sh_dmae_lock);
+
+ /* reset dma controller - only needed as a test */
+ err = sh_dmae_rst(shdev);
+ if (err)
+ goto rst_err;
+
+#if defined(CONFIG_CPU_SH4) || defined(CONFIG_ARCH_SHMOBILE)
+ chanirq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 1);
+
+ if (!chanirq_res)
+ chanirq_res = errirq_res;
+ else
+ irqres++;
+
+ if (chanirq_res == errirq_res ||
+ (errirq_res->flags & IORESOURCE_BITS) == IORESOURCE_IRQ_SHAREABLE)
+ irqflags = IRQF_SHARED;
+
+ errirq = errirq_res->start;
+
+ err = request_irq(errirq, sh_dmae_err, irqflags,
+ "DMAC Address Error", shdev);
+ if (err) {
+ dev_err(&pdev->dev,
+ "DMA failed requesting irq #%d, error %d\n",
+ errirq, err);
+ goto eirq_err;
+ }
+
+#else
+ chanirq_res = errirq_res;
+#endif /* CONFIG_CPU_SH4 || CONFIG_ARCH_SHMOBILE */
+
+ if (chanirq_res->start == chanirq_res->end &&
+ !platform_get_resource(pdev, IORESOURCE_IRQ, 1)) {
+ /* Special case - all multiplexed */
+ for (; irq_cnt < pdata->channel_num; irq_cnt++) {
+ if (irq_cnt < SH_DMAE_MAX_CHANNELS) {
+ chan_irq[irq_cnt] = chanirq_res->start;
+ chan_flag[irq_cnt] = IRQF_SHARED;
+ } else {
+ irq_cap = 1;
+ break;
+ }
+ }
+ } else {
+ do {
+ for (i = chanirq_res->start; i <= chanirq_res->end; i++) {
+ if (irq_cnt >= SH_DMAE_MAX_CHANNELS) {
+ irq_cap = 1;
+ break;
+ }
+
+ if ((errirq_res->flags & IORESOURCE_BITS) ==
+ IORESOURCE_IRQ_SHAREABLE)
+ chan_flag[irq_cnt] = IRQF_SHARED;
+ else
+ chan_flag[irq_cnt] = IRQF_DISABLED;
+ dev_dbg(&pdev->dev,
+ "Found IRQ %d for channel %d\n",
+ i, irq_cnt);
+ chan_irq[irq_cnt++] = i;
+ }
+
+ if (irq_cnt >= SH_DMAE_MAX_CHANNELS)
+ break;
+
+ chanirq_res = platform_get_resource(pdev,
+ IORESOURCE_IRQ, ++irqres);
+ } while (irq_cnt < pdata->channel_num && chanirq_res);
+ }
+
+ /* Create DMA Channel */
+ for (i = 0; i < irq_cnt; i++) {
+ err = sh_dmae_chan_probe(shdev, i, chan_irq[i], chan_flag[i]);
+ if (err)
+ goto chan_probe_err;
+ }
+
+ if (irq_cap)
+ dev_notice(&pdev->dev, "Attempting to register %d DMA "
+ "channels when a maximum of %d are supported.\n",
+ pdata->channel_num, SH_DMAE_MAX_CHANNELS);
+
+ pm_runtime_put(&pdev->dev);
+
+ err = dma_async_device_register(&shdev->shdma_dev.dma_dev);
+ if (err < 0)
+ goto edmadevreg;
+
+ return err;
+
+edmadevreg:
+ pm_runtime_get(&pdev->dev);
+
+chan_probe_err:
+ sh_dmae_chan_remove(shdev);
+
+#if defined(CONFIG_CPU_SH4) || defined(CONFIG_ARCH_SHMOBILE)
+ free_irq(errirq, shdev);
+eirq_err:
+#endif
+rst_err:
+ spin_lock_irq(&sh_dmae_lock);
+ list_del_rcu(&shdev->node);
+ spin_unlock_irq(&sh_dmae_lock);
+
+ pm_runtime_put(&pdev->dev);
+ pm_runtime_disable(&pdev->dev);
+
+ platform_set_drvdata(pdev, NULL);
+ shdma_cleanup(&shdev->shdma_dev);
+eshdma:
+ if (dmars)
+ iounmap(shdev->dmars);
+emapdmars:
+ iounmap(shdev->chan_reg);
+ synchronize_rcu();
+emapchan:
+ kfree(shdev);
+ealloc:
+ if (dmars)
+ release_mem_region(dmars->start, resource_size(dmars));
+ermrdmars:
+ release_mem_region(chan->start, resource_size(chan));
+
+ return err;
+}
+
+static int __devexit sh_dmae_remove(struct platform_device *pdev)
+{
+ struct sh_dmae_device *shdev = platform_get_drvdata(pdev);
+ struct dma_device *dma_dev = &shdev->shdma_dev.dma_dev;
+ struct resource *res;
+ int errirq = platform_get_irq(pdev, 0);
+
+ dma_async_device_unregister(dma_dev);
+
+ if (errirq > 0)
+ free_irq(errirq, shdev);
+
+ spin_lock_irq(&sh_dmae_lock);
+ list_del_rcu(&shdev->node);
+ spin_unlock_irq(&sh_dmae_lock);
+
+ pm_runtime_disable(&pdev->dev);
+
+ sh_dmae_chan_remove(shdev);
+ shdma_cleanup(&shdev->shdma_dev);
+
+ if (shdev->dmars)
+ iounmap(shdev->dmars);
+ iounmap(shdev->chan_reg);
+
+ platform_set_drvdata(pdev, NULL);
+
+ synchronize_rcu();
+ kfree(shdev);
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (res)
+ release_mem_region(res->start, resource_size(res));
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+ if (res)
+ release_mem_region(res->start, resource_size(res));
+
+ return 0;
+}
+
+static struct platform_driver sh_dmae_driver = {
+ .driver = {
+ .owner = THIS_MODULE,
+ .pm = &sh_dmae_pm,
+ .name = SH_DMAE_DRV_NAME,
+ },
+ .remove = __devexit_p(sh_dmae_remove),
+ .shutdown = sh_dmae_shutdown,
+};
+
+static int __init sh_dmae_init(void)
+{
+ /* Wire up NMI handling */
+ int err = register_die_notifier(&sh_dmae_nmi_notifier);
+ if (err)
+ return err;
+
+ return platform_driver_probe(&sh_dmae_driver, sh_dmae_probe);
+}
+module_init(sh_dmae_init);
+
+static void __exit sh_dmae_exit(void)
+{
+ platform_driver_unregister(&sh_dmae_driver);
+
+ unregister_die_notifier(&sh_dmae_nmi_notifier);
+}
+module_exit(sh_dmae_exit);
+
+MODULE_AUTHOR("Nobuhiro Iwamatsu <iwamatsu.nobuhiro@renesas.com>");
+MODULE_DESCRIPTION("Renesas SH DMA Engine driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:" SH_DMAE_DRV_NAME);
diff --git a/drivers/dma/shdma.h b/drivers/dma/sh/shdma.h
index 0b1d2c105f02..9314e93225db 100644
--- a/drivers/dma/shdma.h
+++ b/drivers/dma/sh/shdma.h
@@ -13,42 +13,29 @@
#ifndef __DMA_SHDMA_H
#define __DMA_SHDMA_H
+#include <linux/sh_dma.h>
+#include <linux/shdma-base.h>
#include <linux/dmaengine.h>
#include <linux/interrupt.h>
#include <linux/list.h>
-#define SH_DMAC_MAX_CHANNELS 20
-#define SH_DMA_SLAVE_NUMBER 256
-#define SH_DMA_TCR_MAX 0x00FFFFFF /* 16MB */
+#define SH_DMAE_MAX_CHANNELS 20
+#define SH_DMAE_TCR_MAX 0x00FFFFFF /* 16MB */
struct device;
-enum dmae_pm_state {
- DMAE_PM_ESTABLISHED,
- DMAE_PM_BUSY,
- DMAE_PM_PENDING,
-};
-
struct sh_dmae_chan {
- spinlock_t desc_lock; /* Descriptor operation lock */
- struct list_head ld_queue; /* Link descriptors queue */
- struct list_head ld_free; /* Link descriptors free */
- struct dma_chan common; /* DMA common channel */
- struct device *dev; /* Channel device */
- struct tasklet_struct tasklet; /* Tasklet */
- int descs_allocated; /* desc count */
+ struct shdma_chan shdma_chan;
+ const struct sh_dmae_slave_config *config; /* Slave DMA configuration */
int xmit_shift; /* log_2(bytes_per_xfer) */
- int irq;
- int id; /* Raw id of this channel */
u32 __iomem *base;
char dev_id[16]; /* unique name per DMAC of channel */
int pm_error;
- enum dmae_pm_state pm_state;
};
struct sh_dmae_device {
- struct dma_device common;
- struct sh_dmae_chan *chan[SH_DMAC_MAX_CHANNELS];
+ struct shdma_dev shdma_dev;
+ struct sh_dmae_chan *chan[SH_DMAE_MAX_CHANNELS];
struct sh_dmae_pdata *pdata;
struct list_head node;
u32 __iomem *chan_reg;
@@ -57,10 +44,21 @@ struct sh_dmae_device {
u32 chcr_ie_bit;
};
-#define to_sh_chan(chan) container_of(chan, struct sh_dmae_chan, common)
+struct sh_dmae_regs {
+ u32 sar; /* SAR / source address */
+ u32 dar; /* DAR / destination address */
+ u32 tcr; /* TCR / transfer count */
+};
+
+struct sh_dmae_desc {
+ struct sh_dmae_regs hw;
+ struct shdma_desc shdma_desc;
+};
+
+#define to_sh_chan(chan) container_of(chan, struct sh_dmae_chan, shdma_chan)
#define to_sh_desc(lh) container_of(lh, struct sh_desc, node)
#define tx_to_sh_desc(tx) container_of(tx, struct sh_desc, async_tx)
-#define to_sh_dev(chan) container_of(chan->common.device,\
- struct sh_dmae_device, common)
+#define to_sh_dev(chan) container_of(chan->shdma_chan.dma_chan.device,\
+ struct sh_dmae_device, shdma_dev.dma_dev)
#endif /* __DMA_SHDMA_H */
diff --git a/drivers/dma/shdma.c b/drivers/dma/shdma.c
deleted file mode 100644
index 19d7a8d3975d..000000000000
--- a/drivers/dma/shdma.c
+++ /dev/null
@@ -1,1524 +0,0 @@
-/*
- * Renesas SuperH DMA Engine support
- *
- * base is drivers/dma/flsdma.c
- *
- * Copyright (C) 2009 Nobuhiro Iwamatsu <iwamatsu.nobuhiro@renesas.com>
- * Copyright (C) 2009 Renesas Solutions, Inc. All rights reserved.
- * Copyright (C) 2007 Freescale Semiconductor, Inc. All rights reserved.
- *
- * This is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * - DMA of SuperH does not have Hardware DMA chain mode.
- * - MAX DMA size is 16MB.
- *
- */
-
-#include <linux/init.h>
-#include <linux/module.h>
-#include <linux/slab.h>
-#include <linux/interrupt.h>
-#include <linux/dmaengine.h>
-#include <linux/delay.h>
-#include <linux/platform_device.h>
-#include <linux/pm_runtime.h>
-#include <linux/sh_dma.h>
-#include <linux/notifier.h>
-#include <linux/kdebug.h>
-#include <linux/spinlock.h>
-#include <linux/rculist.h>
-
-#include "dmaengine.h"
-#include "shdma.h"
-
-/* DMA descriptor control */
-enum sh_dmae_desc_status {
- DESC_IDLE,
- DESC_PREPARED,
- DESC_SUBMITTED,
- DESC_COMPLETED, /* completed, have to call callback */
- DESC_WAITING, /* callback called, waiting for ack / re-submit */
-};
-
-#define NR_DESCS_PER_CHANNEL 32
-/* Default MEMCPY transfer size = 2^2 = 4 bytes */
-#define LOG2_DEFAULT_XFER_SIZE 2
-
-/*
- * Used for write-side mutual exclusion for the global device list,
- * read-side synchronization by way of RCU, and per-controller data.
- */
-static DEFINE_SPINLOCK(sh_dmae_lock);
-static LIST_HEAD(sh_dmae_devices);
-
-/* A bitmask with bits enough for enum sh_dmae_slave_chan_id */
-static unsigned long sh_dmae_slave_used[BITS_TO_LONGS(SH_DMA_SLAVE_NUMBER)];
-
-static void sh_dmae_chan_ld_cleanup(struct sh_dmae_chan *sh_chan, bool all);
-static void sh_chan_xfer_ld_queue(struct sh_dmae_chan *sh_chan);
-
-static void chclr_write(struct sh_dmae_chan *sh_dc, u32 data)
-{
- struct sh_dmae_device *shdev = to_sh_dev(sh_dc);
-
- __raw_writel(data, shdev->chan_reg +
- shdev->pdata->channel[sh_dc->id].chclr_offset);
-}
-
-static void sh_dmae_writel(struct sh_dmae_chan *sh_dc, u32 data, u32 reg)
-{
- __raw_writel(data, sh_dc->base + reg / sizeof(u32));
-}
-
-static u32 sh_dmae_readl(struct sh_dmae_chan *sh_dc, u32 reg)
-{
- return __raw_readl(sh_dc->base + reg / sizeof(u32));
-}
-
-static u16 dmaor_read(struct sh_dmae_device *shdev)
-{
- u32 __iomem *addr = shdev->chan_reg + DMAOR / sizeof(u32);
-
- if (shdev->pdata->dmaor_is_32bit)
- return __raw_readl(addr);
- else
- return __raw_readw(addr);
-}
-
-static void dmaor_write(struct sh_dmae_device *shdev, u16 data)
-{
- u32 __iomem *addr = shdev->chan_reg + DMAOR / sizeof(u32);
-
- if (shdev->pdata->dmaor_is_32bit)
- __raw_writel(data, addr);
- else
- __raw_writew(data, addr);
-}
-
-static void chcr_write(struct sh_dmae_chan *sh_dc, u32 data)
-{
- struct sh_dmae_device *shdev = to_sh_dev(sh_dc);
-
- __raw_writel(data, sh_dc->base + shdev->chcr_offset / sizeof(u32));
-}
-
-static u32 chcr_read(struct sh_dmae_chan *sh_dc)
-{
- struct sh_dmae_device *shdev = to_sh_dev(sh_dc);
-
- return __raw_readl(sh_dc->base + shdev->chcr_offset / sizeof(u32));
-}
-
-/*
- * Reset DMA controller
- *
- * SH7780 has two DMAOR register
- */
-static void sh_dmae_ctl_stop(struct sh_dmae_device *shdev)
-{
- unsigned short dmaor;
- unsigned long flags;
-
- spin_lock_irqsave(&sh_dmae_lock, flags);
-
- dmaor = dmaor_read(shdev);
- dmaor_write(shdev, dmaor & ~(DMAOR_NMIF | DMAOR_AE | DMAOR_DME));
-
- spin_unlock_irqrestore(&sh_dmae_lock, flags);
-}
-
-static int sh_dmae_rst(struct sh_dmae_device *shdev)
-{
- unsigned short dmaor;
- unsigned long flags;
-
- spin_lock_irqsave(&sh_dmae_lock, flags);
-
- dmaor = dmaor_read(shdev) & ~(DMAOR_NMIF | DMAOR_AE | DMAOR_DME);
-
- if (shdev->pdata->chclr_present) {
- int i;
- for (i = 0; i < shdev->pdata->channel_num; i++) {
- struct sh_dmae_chan *sh_chan = shdev->chan[i];
- if (sh_chan)
- chclr_write(sh_chan, 0);
- }
- }
-
- dmaor_write(shdev, dmaor | shdev->pdata->dmaor_init);
-
- dmaor = dmaor_read(shdev);
-
- spin_unlock_irqrestore(&sh_dmae_lock, flags);
-
- if (dmaor & (DMAOR_AE | DMAOR_NMIF)) {
- dev_warn(shdev->common.dev, "Can't initialize DMAOR.\n");
- return -EIO;
- }
- if (shdev->pdata->dmaor_init & ~dmaor)
- dev_warn(shdev->common.dev,
- "DMAOR=0x%x hasn't latched the initial value 0x%x.\n",
- dmaor, shdev->pdata->dmaor_init);
- return 0;
-}
-
-static bool dmae_is_busy(struct sh_dmae_chan *sh_chan)
-{
- u32 chcr = chcr_read(sh_chan);
-
- if ((chcr & (CHCR_DE | CHCR_TE)) == CHCR_DE)
- return true; /* working */
-
- return false; /* waiting */
-}
-
-static unsigned int calc_xmit_shift(struct sh_dmae_chan *sh_chan, u32 chcr)
-{
- struct sh_dmae_device *shdev = to_sh_dev(sh_chan);
- struct sh_dmae_pdata *pdata = shdev->pdata;
- int cnt = ((chcr & pdata->ts_low_mask) >> pdata->ts_low_shift) |
- ((chcr & pdata->ts_high_mask) >> pdata->ts_high_shift);
-
- if (cnt >= pdata->ts_shift_num)
- cnt = 0;
-
- return pdata->ts_shift[cnt];
-}
-
-static u32 log2size_to_chcr(struct sh_dmae_chan *sh_chan, int l2size)
-{
- struct sh_dmae_device *shdev = to_sh_dev(sh_chan);
- struct sh_dmae_pdata *pdata = shdev->pdata;
- int i;
-
- for (i = 0; i < pdata->ts_shift_num; i++)
- if (pdata->ts_shift[i] == l2size)
- break;
-
- if (i == pdata->ts_shift_num)
- i = 0;
-
- return ((i << pdata->ts_low_shift) & pdata->ts_low_mask) |
- ((i << pdata->ts_high_shift) & pdata->ts_high_mask);
-}
-
-static void dmae_set_reg(struct sh_dmae_chan *sh_chan, struct sh_dmae_regs *hw)
-{
- sh_dmae_writel(sh_chan, hw->sar, SAR);
- sh_dmae_writel(sh_chan, hw->dar, DAR);
- sh_dmae_writel(sh_chan, hw->tcr >> sh_chan->xmit_shift, TCR);
-}
-
-static void dmae_start(struct sh_dmae_chan *sh_chan)
-{
- struct sh_dmae_device *shdev = to_sh_dev(sh_chan);
- u32 chcr = chcr_read(sh_chan);
-
- if (shdev->pdata->needs_tend_set)
- sh_dmae_writel(sh_chan, 0xFFFFFFFF, TEND);
-
- chcr |= CHCR_DE | shdev->chcr_ie_bit;
- chcr_write(sh_chan, chcr & ~CHCR_TE);
-}
-
-static void dmae_halt(struct sh_dmae_chan *sh_chan)
-{
- struct sh_dmae_device *shdev = to_sh_dev(sh_chan);
- u32 chcr = chcr_read(sh_chan);
-
- chcr &= ~(CHCR_DE | CHCR_TE | shdev->chcr_ie_bit);
- chcr_write(sh_chan, chcr);
-}
-
-static void dmae_init(struct sh_dmae_chan *sh_chan)
-{
- /*
- * Default configuration for dual address memory-memory transfer.
- * 0x400 represents auto-request.
- */
- u32 chcr = DM_INC | SM_INC | 0x400 | log2size_to_chcr(sh_chan,
- LOG2_DEFAULT_XFER_SIZE);
- sh_chan->xmit_shift = calc_xmit_shift(sh_chan, chcr);
- chcr_write(sh_chan, chcr);
-}
-
-static int dmae_set_chcr(struct sh_dmae_chan *sh_chan, u32 val)
-{
- /* If DMA is active, cannot set CHCR. TODO: remove this superfluous check */
- if (dmae_is_busy(sh_chan))
- return -EBUSY;
-
- sh_chan->xmit_shift = calc_xmit_shift(sh_chan, val);
- chcr_write(sh_chan, val);
-
- return 0;
-}
-
-static int dmae_set_dmars(struct sh_dmae_chan *sh_chan, u16 val)
-{
- struct sh_dmae_device *shdev = to_sh_dev(sh_chan);
- struct sh_dmae_pdata *pdata = shdev->pdata;
- const struct sh_dmae_channel *chan_pdata = &pdata->channel[sh_chan->id];
- u16 __iomem *addr = shdev->dmars;
- unsigned int shift = chan_pdata->dmars_bit;
-
- if (dmae_is_busy(sh_chan))
- return -EBUSY;
-
- if (pdata->no_dmars)
- return 0;
-
- /* in the case of a missing DMARS resource use first memory window */
- if (!addr)
- addr = (u16 __iomem *)shdev->chan_reg;
- addr += chan_pdata->dmars / sizeof(u16);
-
- __raw_writew((__raw_readw(addr) & (0xff00 >> shift)) | (val << shift),
- addr);
-
- return 0;
-}
-
-static dma_cookie_t sh_dmae_tx_submit(struct dma_async_tx_descriptor *tx)
-{
- struct sh_desc *desc = tx_to_sh_desc(tx), *chunk, *last = desc, *c;
- struct sh_dmae_chan *sh_chan = to_sh_chan(tx->chan);
- struct sh_dmae_slave *param = tx->chan->private;
- dma_async_tx_callback callback = tx->callback;
- dma_cookie_t cookie;
- bool power_up;
-
- spin_lock_irq(&sh_chan->desc_lock);
-
- if (list_empty(&sh_chan->ld_queue))
- power_up = true;
- else
- power_up = false;
-
- cookie = dma_cookie_assign(tx);
-
- /* Mark all chunks of this descriptor as submitted, move to the queue */
- list_for_each_entry_safe(chunk, c, desc->node.prev, node) {
- /*
- * All chunks are on the global ld_free, so, we have to find
- * the end of the chain ourselves
- */
- if (chunk != desc && (chunk->mark == DESC_IDLE ||
- chunk->async_tx.cookie > 0 ||
- chunk->async_tx.cookie == -EBUSY ||
- &chunk->node == &sh_chan->ld_free))
- break;
- chunk->mark = DESC_SUBMITTED;
- /* Callback goes to the last chunk */
- chunk->async_tx.callback = NULL;
- chunk->cookie = cookie;
- list_move_tail(&chunk->node, &sh_chan->ld_queue);
- last = chunk;
- }
-
- last->async_tx.callback = callback;
- last->async_tx.callback_param = tx->callback_param;
-
- dev_dbg(sh_chan->dev, "submit #%d@%p on %d: %x[%d] -> %x\n",
- tx->cookie, &last->async_tx, sh_chan->id,
- desc->hw.sar, desc->hw.tcr, desc->hw.dar);
-
- if (power_up) {
- sh_chan->pm_state = DMAE_PM_BUSY;
-
- pm_runtime_get(sh_chan->dev);
-
- spin_unlock_irq(&sh_chan->desc_lock);
-
- pm_runtime_barrier(sh_chan->dev);
-
- spin_lock_irq(&sh_chan->desc_lock);
-
- /* Have we been reset, while waiting? */
- if (sh_chan->pm_state != DMAE_PM_ESTABLISHED) {
- dev_dbg(sh_chan->dev, "Bring up channel %d\n",
- sh_chan->id);
- if (param) {
- const struct sh_dmae_slave_config *cfg =
- param->config;
-
- dmae_set_dmars(sh_chan, cfg->mid_rid);
- dmae_set_chcr(sh_chan, cfg->chcr);
- } else {
- dmae_init(sh_chan);
- }
-
- if (sh_chan->pm_state == DMAE_PM_PENDING)
- sh_chan_xfer_ld_queue(sh_chan);
- sh_chan->pm_state = DMAE_PM_ESTABLISHED;
- }
- } else {
- sh_chan->pm_state = DMAE_PM_PENDING;
- }
-
- spin_unlock_irq(&sh_chan->desc_lock);
-
- return cookie;
-}
-
-/* Called with desc_lock held */
-static struct sh_desc *sh_dmae_get_desc(struct sh_dmae_chan *sh_chan)
-{
- struct sh_desc *desc;
-
- list_for_each_entry(desc, &sh_chan->ld_free, node)
- if (desc->mark != DESC_PREPARED) {
- BUG_ON(desc->mark != DESC_IDLE);
- list_del(&desc->node);
- return desc;
- }
-
- return NULL;
-}
-
-static const struct sh_dmae_slave_config *sh_dmae_find_slave(
- struct sh_dmae_chan *sh_chan, struct sh_dmae_slave *param)
-{
- struct sh_dmae_device *shdev = to_sh_dev(sh_chan);
- struct sh_dmae_pdata *pdata = shdev->pdata;
- int i;
-
- if (param->slave_id >= SH_DMA_SLAVE_NUMBER)
- return NULL;
-
- for (i = 0; i < pdata->slave_num; i++)
- if (pdata->slave[i].slave_id == param->slave_id)
- return pdata->slave + i;
-
- return NULL;
-}
-
-static int sh_dmae_alloc_chan_resources(struct dma_chan *chan)
-{
- struct sh_dmae_chan *sh_chan = to_sh_chan(chan);
- struct sh_desc *desc;
- struct sh_dmae_slave *param = chan->private;
- int ret;
-
- /*
- * This relies on the guarantee from dmaengine that alloc_chan_resources
- * never runs concurrently with itself or free_chan_resources.
- */
- if (param) {
- const struct sh_dmae_slave_config *cfg;
-
- cfg = sh_dmae_find_slave(sh_chan, param);
- if (!cfg) {
- ret = -EINVAL;
- goto efindslave;
- }
-
- if (test_and_set_bit(param->slave_id, sh_dmae_slave_used)) {
- ret = -EBUSY;
- goto etestused;
- }
-
- param->config = cfg;
- }
-
- while (sh_chan->descs_allocated < NR_DESCS_PER_CHANNEL) {
- desc = kzalloc(sizeof(struct sh_desc), GFP_KERNEL);
- if (!desc)
- break;
- dma_async_tx_descriptor_init(&desc->async_tx,
- &sh_chan->common);
- desc->async_tx.tx_submit = sh_dmae_tx_submit;
- desc->mark = DESC_IDLE;
-
- list_add(&desc->node, &sh_chan->ld_free);
- sh_chan->descs_allocated++;
- }
-
- if (!sh_chan->descs_allocated) {
- ret = -ENOMEM;
- goto edescalloc;
- }
-
- return sh_chan->descs_allocated;
-
-edescalloc:
- if (param)
- clear_bit(param->slave_id, sh_dmae_slave_used);
-etestused:
-efindslave:
- chan->private = NULL;
- return ret;
-}
-
-/*
- * sh_dma_free_chan_resources - Free all resources of the channel.
- */
-static void sh_dmae_free_chan_resources(struct dma_chan *chan)
-{
- struct sh_dmae_chan *sh_chan = to_sh_chan(chan);
- struct sh_desc *desc, *_desc;
- LIST_HEAD(list);
-
- /* Protect against ISR */
- spin_lock_irq(&sh_chan->desc_lock);
- dmae_halt(sh_chan);
- spin_unlock_irq(&sh_chan->desc_lock);
-
- /* Now no new interrupts will occur */
-
- /* Prepared and not submitted descriptors can still be on the queue */
- if (!list_empty(&sh_chan->ld_queue))
- sh_dmae_chan_ld_cleanup(sh_chan, true);
-
- if (chan->private) {
- /* The caller is holding dma_list_mutex */
- struct sh_dmae_slave *param = chan->private;
- clear_bit(param->slave_id, sh_dmae_slave_used);
- chan->private = NULL;
- }
-
- spin_lock_irq(&sh_chan->desc_lock);
-
- list_splice_init(&sh_chan->ld_free, &list);
- sh_chan->descs_allocated = 0;
-
- spin_unlock_irq(&sh_chan->desc_lock);
-
- list_for_each_entry_safe(desc, _desc, &list, node)
- kfree(desc);
-}
-
-/**
- * sh_dmae_add_desc - get, set up and return one transfer descriptor
- * @sh_chan: DMA channel
- * @flags: DMA transfer flags
- * @dest: destination DMA address, incremented when direction equals
- * DMA_DEV_TO_MEM
- * @src: source DMA address, incremented when direction equals
- * DMA_MEM_TO_DEV
- * @len: DMA transfer length
- * @first: if NULL, set to the current descriptor and cookie set to -EBUSY
- * @direction: needed for slave DMA to decide which address to keep constant,
- * equals DMA_MEM_TO_MEM for MEMCPY
- * Returns 0 or an error
- * Locks: called with desc_lock held
- */
-static struct sh_desc *sh_dmae_add_desc(struct sh_dmae_chan *sh_chan,
- unsigned long flags, dma_addr_t *dest, dma_addr_t *src, size_t *len,
- struct sh_desc **first, enum dma_transfer_direction direction)
-{
- struct sh_desc *new;
- size_t copy_size;
-
- if (!*len)
- return NULL;
-
- /* Allocate the link descriptor from the free list */
- new = sh_dmae_get_desc(sh_chan);
- if (!new) {
- dev_err(sh_chan->dev, "No free link descriptor available\n");
- return NULL;
- }
-
- copy_size = min(*len, (size_t)SH_DMA_TCR_MAX + 1);
-
- new->hw.sar = *src;
- new->hw.dar = *dest;
- new->hw.tcr = copy_size;
-
- if (!*first) {
- /* First desc */
- new->async_tx.cookie = -EBUSY;
- *first = new;
- } else {
- /* Other desc - invisible to the user */
- new->async_tx.cookie = -EINVAL;
- }
-
- dev_dbg(sh_chan->dev,
- "chaining (%u/%u)@%x -> %x with %p, cookie %d, shift %d\n",
- copy_size, *len, *src, *dest, &new->async_tx,
- new->async_tx.cookie, sh_chan->xmit_shift);
-
- new->mark = DESC_PREPARED;
- new->async_tx.flags = flags;
- new->direction = direction;
-
- *len -= copy_size;
- if (direction == DMA_MEM_TO_MEM || direction == DMA_MEM_TO_DEV)
- *src += copy_size;
- if (direction == DMA_MEM_TO_MEM || direction == DMA_DEV_TO_MEM)
- *dest += copy_size;
-
- return new;
-}
-
-/*
- * sh_dmae_prep_sg - prepare transfer descriptors from an SG list
- *
- * Common routine for public (MEMCPY) and slave DMA. The MEMCPY case is also
- * converted to scatter-gather to guarantee consistent locking and a correct
- * list manipulation. For slave DMA direction carries the usual meaning, and,
- * logically, the SG list is RAM and the addr variable contains slave address,
- * e.g., the FIFO I/O register. For MEMCPY direction equals DMA_MEM_TO_MEM
- * and the SG list contains only one element and points at the source buffer.
- */
-static struct dma_async_tx_descriptor *sh_dmae_prep_sg(struct sh_dmae_chan *sh_chan,
- struct scatterlist *sgl, unsigned int sg_len, dma_addr_t *addr,
- enum dma_transfer_direction direction, unsigned long flags)
-{
- struct scatterlist *sg;
- struct sh_desc *first = NULL, *new = NULL /* compiler... */;
- LIST_HEAD(tx_list);
- int chunks = 0;
- unsigned long irq_flags;
- int i;
-
- if (!sg_len)
- return NULL;
-
- for_each_sg(sgl, sg, sg_len, i)
- chunks += (sg_dma_len(sg) + SH_DMA_TCR_MAX) /
- (SH_DMA_TCR_MAX + 1);
-
- /* Have to lock the whole loop to protect against concurrent release */
- spin_lock_irqsave(&sh_chan->desc_lock, irq_flags);
-
- /*
- * Chaining:
- * first descriptor is what user is dealing with in all API calls, its
- * cookie is at first set to -EBUSY, at tx-submit to a positive
- * number
- * if more than one chunk is needed further chunks have cookie = -EINVAL
- * the last chunk, if not equal to the first, has cookie = -ENOSPC
- * all chunks are linked onto the tx_list head with their .node heads
- * only during this function, then they are immediately spliced
- * back onto the free list in form of a chain
- */
- for_each_sg(sgl, sg, sg_len, i) {
- dma_addr_t sg_addr = sg_dma_address(sg);
- size_t len = sg_dma_len(sg);
-
- if (!len)
- goto err_get_desc;
-
- do {
- dev_dbg(sh_chan->dev, "Add SG #%d@%p[%d], dma %llx\n",
- i, sg, len, (unsigned long long)sg_addr);
-
- if (direction == DMA_DEV_TO_MEM)
- new = sh_dmae_add_desc(sh_chan, flags,
- &sg_addr, addr, &len, &first,
- direction);
- else
- new = sh_dmae_add_desc(sh_chan, flags,
- addr, &sg_addr, &len, &first,
- direction);
- if (!new)
- goto err_get_desc;
-
- new->chunks = chunks--;
- list_add_tail(&new->node, &tx_list);
- } while (len);
- }
-
- if (new != first)
- new->async_tx.cookie = -ENOSPC;
-
- /* Put them back on the free list, so, they don't get lost */
- list_splice_tail(&tx_list, &sh_chan->ld_free);
-
- spin_unlock_irqrestore(&sh_chan->desc_lock, irq_flags);
-
- return &first->async_tx;
-
-err_get_desc:
- list_for_each_entry(new, &tx_list, node)
- new->mark = DESC_IDLE;
- list_splice(&tx_list, &sh_chan->ld_free);
-
- spin_unlock_irqrestore(&sh_chan->desc_lock, irq_flags);
-
- return NULL;
-}
-
-static struct dma_async_tx_descriptor *sh_dmae_prep_memcpy(
- struct dma_chan *chan, dma_addr_t dma_dest, dma_addr_t dma_src,
- size_t len, unsigned long flags)
-{
- struct sh_dmae_chan *sh_chan;
- struct scatterlist sg;
-
- if (!chan || !len)
- return NULL;
-
- sh_chan = to_sh_chan(chan);
-
- sg_init_table(&sg, 1);
- sg_set_page(&sg, pfn_to_page(PFN_DOWN(dma_src)), len,
- offset_in_page(dma_src));
- sg_dma_address(&sg) = dma_src;
- sg_dma_len(&sg) = len;
-
- return sh_dmae_prep_sg(sh_chan, &sg, 1, &dma_dest, DMA_MEM_TO_MEM,
- flags);
-}
-
-static struct dma_async_tx_descriptor *sh_dmae_prep_slave_sg(
- struct dma_chan *chan, struct scatterlist *sgl, unsigned int sg_len,
- enum dma_transfer_direction direction, unsigned long flags,
- void *context)
-{
- struct sh_dmae_slave *param;
- struct sh_dmae_chan *sh_chan;
- dma_addr_t slave_addr;
-
- if (!chan)
- return NULL;
-
- sh_chan = to_sh_chan(chan);
- param = chan->private;
-
- /* Someone calling slave DMA on a public channel? */
- if (!param || !sg_len) {
- dev_warn(sh_chan->dev, "%s: bad parameter: %p, %d, %d\n",
- __func__, param, sg_len, param ? param->slave_id : -1);
- return NULL;
- }
-
- slave_addr = param->config->addr;
-
- /*
- * if (param != NULL), this is a successfully requested slave channel,
- * therefore param->config != NULL too.
- */
- return sh_dmae_prep_sg(sh_chan, sgl, sg_len, &slave_addr,
- direction, flags);
-}
-
-static int sh_dmae_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd,
- unsigned long arg)
-{
- struct sh_dmae_chan *sh_chan = to_sh_chan(chan);
- unsigned long flags;
-
- /* Only supports DMA_TERMINATE_ALL */
- if (cmd != DMA_TERMINATE_ALL)
- return -ENXIO;
-
- if (!chan)
- return -EINVAL;
-
- spin_lock_irqsave(&sh_chan->desc_lock, flags);
- dmae_halt(sh_chan);
-
- if (!list_empty(&sh_chan->ld_queue)) {
- /* Record partial transfer */
- struct sh_desc *desc = list_entry(sh_chan->ld_queue.next,
- struct sh_desc, node);
- desc->partial = (desc->hw.tcr - sh_dmae_readl(sh_chan, TCR)) <<
- sh_chan->xmit_shift;
- }
- spin_unlock_irqrestore(&sh_chan->desc_lock, flags);
-
- sh_dmae_chan_ld_cleanup(sh_chan, true);
-
- return 0;
-}
-
-static dma_async_tx_callback __ld_cleanup(struct sh_dmae_chan *sh_chan, bool all)
-{
- struct sh_desc *desc, *_desc;
- /* Is the "exposed" head of a chain acked? */
- bool head_acked = false;
- dma_cookie_t cookie = 0;
- dma_async_tx_callback callback = NULL;
- void *param = NULL;
- unsigned long flags;
-
- spin_lock_irqsave(&sh_chan->desc_lock, flags);
- list_for_each_entry_safe(desc, _desc, &sh_chan->ld_queue, node) {
- struct dma_async_tx_descriptor *tx = &desc->async_tx;
-
- BUG_ON(tx->cookie > 0 && tx->cookie != desc->cookie);
- BUG_ON(desc->mark != DESC_SUBMITTED &&
- desc->mark != DESC_COMPLETED &&
- desc->mark != DESC_WAITING);
-
- /*
- * queue is ordered, and we use this loop to (1) clean up all
- * completed descriptors, and to (2) update descriptor flags of
- * any chunks in a (partially) completed chain
- */
- if (!all && desc->mark == DESC_SUBMITTED &&
- desc->cookie != cookie)
- break;
-
- if (tx->cookie > 0)
- cookie = tx->cookie;
-
- if (desc->mark == DESC_COMPLETED && desc->chunks == 1) {
- if (sh_chan->common.completed_cookie != desc->cookie - 1)
- dev_dbg(sh_chan->dev,
- "Completing cookie %d, expected %d\n",
- desc->cookie,
- sh_chan->common.completed_cookie + 1);
- sh_chan->common.completed_cookie = desc->cookie;
- }
-
- /* Call callback on the last chunk */
- if (desc->mark == DESC_COMPLETED && tx->callback) {
- desc->mark = DESC_WAITING;
- callback = tx->callback;
- param = tx->callback_param;
- dev_dbg(sh_chan->dev, "descriptor #%d@%p on %d callback\n",
- tx->cookie, tx, sh_chan->id);
- BUG_ON(desc->chunks != 1);
- break;
- }
-
- if (tx->cookie > 0 || tx->cookie == -EBUSY) {
- if (desc->mark == DESC_COMPLETED) {
- BUG_ON(tx->cookie < 0);
- desc->mark = DESC_WAITING;
- }
- head_acked = async_tx_test_ack(tx);
- } else {
- switch (desc->mark) {
- case DESC_COMPLETED:
- desc->mark = DESC_WAITING;
- /* Fall through */
- case DESC_WAITING:
- if (head_acked)
- async_tx_ack(&desc->async_tx);
- }
- }
-
- dev_dbg(sh_chan->dev, "descriptor %p #%d completed.\n",
- tx, tx->cookie);
-
- if (((desc->mark == DESC_COMPLETED ||
- desc->mark == DESC_WAITING) &&
- async_tx_test_ack(&desc->async_tx)) || all) {
- /* Remove from ld_queue list */
- desc->mark = DESC_IDLE;
-
- list_move(&desc->node, &sh_chan->ld_free);
-
- if (list_empty(&sh_chan->ld_queue)) {
- dev_dbg(sh_chan->dev, "Bring down channel %d\n", sh_chan->id);
- pm_runtime_put(sh_chan->dev);
- }
- }
- }
-
- if (all && !callback)
- /*
- * Terminating and the loop completed normally: forgive
- * uncompleted cookies
- */
- sh_chan->common.completed_cookie = sh_chan->common.cookie;
-
- spin_unlock_irqrestore(&sh_chan->desc_lock, flags);
-
- if (callback)
- callback(param);
-
- return callback;
-}
-
-/*
- * sh_chan_ld_cleanup - Clean up link descriptors
- *
- * This function cleans up the ld_queue of DMA channel.
- */
-static void sh_dmae_chan_ld_cleanup(struct sh_dmae_chan *sh_chan, bool all)
-{
- while (__ld_cleanup(sh_chan, all))
- ;
-}
-
-/* Called under spin_lock_irq(&sh_chan->desc_lock) */
-static void sh_chan_xfer_ld_queue(struct sh_dmae_chan *sh_chan)
-{
- struct sh_desc *desc;
-
- /* DMA work check */
- if (dmae_is_busy(sh_chan))
- return;
-
- /* Find the first not transferred descriptor */
- list_for_each_entry(desc, &sh_chan->ld_queue, node)
- if (desc->mark == DESC_SUBMITTED) {
- dev_dbg(sh_chan->dev, "Queue #%d to %d: %u@%x -> %x\n",
- desc->async_tx.cookie, sh_chan->id,
- desc->hw.tcr, desc->hw.sar, desc->hw.dar);
- /* Get the ld start address from ld_queue */
- dmae_set_reg(sh_chan, &desc->hw);
- dmae_start(sh_chan);
- break;
- }
-}
-
-static void sh_dmae_memcpy_issue_pending(struct dma_chan *chan)
-{
- struct sh_dmae_chan *sh_chan = to_sh_chan(chan);
-
- spin_lock_irq(&sh_chan->desc_lock);
- if (sh_chan->pm_state == DMAE_PM_ESTABLISHED)
- sh_chan_xfer_ld_queue(sh_chan);
- else
- sh_chan->pm_state = DMAE_PM_PENDING;
- spin_unlock_irq(&sh_chan->desc_lock);
-}
-
-static enum dma_status sh_dmae_tx_status(struct dma_chan *chan,
- dma_cookie_t cookie,
- struct dma_tx_state *txstate)
-{
- struct sh_dmae_chan *sh_chan = to_sh_chan(chan);
- enum dma_status status;
- unsigned long flags;
-
- sh_dmae_chan_ld_cleanup(sh_chan, false);
-
- spin_lock_irqsave(&sh_chan->desc_lock, flags);
-
- status = dma_cookie_status(chan, cookie, txstate);
-
- /*
- * If we don't find cookie on the queue, it has been aborted and we have
- * to report error
- */
- if (status != DMA_SUCCESS) {
- struct sh_desc *desc;
- status = DMA_ERROR;
- list_for_each_entry(desc, &sh_chan->ld_queue, node)
- if (desc->cookie == cookie) {
- status = DMA_IN_PROGRESS;
- break;
- }
- }
-
- spin_unlock_irqrestore(&sh_chan->desc_lock, flags);
-
- return status;
-}
-
-static irqreturn_t sh_dmae_interrupt(int irq, void *data)
-{
- irqreturn_t ret = IRQ_NONE;
- struct sh_dmae_chan *sh_chan = data;
- u32 chcr;
-
- spin_lock(&sh_chan->desc_lock);
-
- chcr = chcr_read(sh_chan);
-
- if (chcr & CHCR_TE) {
- /* DMA stop */
- dmae_halt(sh_chan);
-
- ret = IRQ_HANDLED;
- tasklet_schedule(&sh_chan->tasklet);
- }
-
- spin_unlock(&sh_chan->desc_lock);
-
- return ret;
-}
-
-/* Called from error IRQ or NMI */
-static bool sh_dmae_reset(struct sh_dmae_device *shdev)
-{
- unsigned int handled = 0;
- int i;
-
- /* halt the dma controller */
- sh_dmae_ctl_stop(shdev);
-
- /* We cannot detect, which channel caused the error, have to reset all */
- for (i = 0; i < SH_DMAC_MAX_CHANNELS; i++) {
- struct sh_dmae_chan *sh_chan = shdev->chan[i];
- struct sh_desc *desc;
- LIST_HEAD(dl);
-
- if (!sh_chan)
- continue;
-
- spin_lock(&sh_chan->desc_lock);
-
- /* Stop the channel */
- dmae_halt(sh_chan);
-
- list_splice_init(&sh_chan->ld_queue, &dl);
-
- if (!list_empty(&dl)) {
- dev_dbg(sh_chan->dev, "Bring down channel %d\n", sh_chan->id);
- pm_runtime_put(sh_chan->dev);
- }
- sh_chan->pm_state = DMAE_PM_ESTABLISHED;
-
- spin_unlock(&sh_chan->desc_lock);
-
- /* Complete all */
- list_for_each_entry(desc, &dl, node) {
- struct dma_async_tx_descriptor *tx = &desc->async_tx;
- desc->mark = DESC_IDLE;
- if (tx->callback)
- tx->callback(tx->callback_param);
- }
-
- spin_lock(&sh_chan->desc_lock);
- list_splice(&dl, &sh_chan->ld_free);
- spin_unlock(&sh_chan->desc_lock);
-
- handled++;
- }
-
- sh_dmae_rst(shdev);
-
- return !!handled;
-}
-
-static irqreturn_t sh_dmae_err(int irq, void *data)
-{
- struct sh_dmae_device *shdev = data;
-
- if (!(dmaor_read(shdev) & DMAOR_AE))
- return IRQ_NONE;
-
- sh_dmae_reset(data);
- return IRQ_HANDLED;
-}
-
-static void dmae_do_tasklet(unsigned long data)
-{
- struct sh_dmae_chan *sh_chan = (struct sh_dmae_chan *)data;
- struct sh_desc *desc;
- u32 sar_buf = sh_dmae_readl(sh_chan, SAR);
- u32 dar_buf = sh_dmae_readl(sh_chan, DAR);
-
- spin_lock_irq(&sh_chan->desc_lock);
- list_for_each_entry(desc, &sh_chan->ld_queue, node) {
- if (desc->mark == DESC_SUBMITTED &&
- ((desc->direction == DMA_DEV_TO_MEM &&
- (desc->hw.dar + desc->hw.tcr) == dar_buf) ||
- (desc->hw.sar + desc->hw.tcr) == sar_buf)) {
- dev_dbg(sh_chan->dev, "done #%d@%p dst %u\n",
- desc->async_tx.cookie, &desc->async_tx,
- desc->hw.dar);
- desc->mark = DESC_COMPLETED;
- break;
- }
- }
- /* Next desc */
- sh_chan_xfer_ld_queue(sh_chan);
- spin_unlock_irq(&sh_chan->desc_lock);
-
- sh_dmae_chan_ld_cleanup(sh_chan, false);
-}
-
-static bool sh_dmae_nmi_notify(struct sh_dmae_device *shdev)
-{
- /* Fast path out if NMIF is not asserted for this controller */
- if ((dmaor_read(shdev) & DMAOR_NMIF) == 0)
- return false;
-
- return sh_dmae_reset(shdev);
-}
-
-static int sh_dmae_nmi_handler(struct notifier_block *self,
- unsigned long cmd, void *data)
-{
- struct sh_dmae_device *shdev;
- int ret = NOTIFY_DONE;
- bool triggered;
-
- /*
- * Only concern ourselves with NMI events.
- *
- * Normally we would check the die chain value, but as this needs
- * to be architecture independent, check for NMI context instead.
- */
- if (!in_nmi())
- return NOTIFY_DONE;
-
- rcu_read_lock();
- list_for_each_entry_rcu(shdev, &sh_dmae_devices, node) {
- /*
- * Only stop if one of the controllers has NMIF asserted,
- * we do not want to interfere with regular address error
- * handling or NMI events that don't concern the DMACs.
- */
- triggered = sh_dmae_nmi_notify(shdev);
- if (triggered == true)
- ret = NOTIFY_OK;
- }
- rcu_read_unlock();
-
- return ret;
-}
-
-static struct notifier_block sh_dmae_nmi_notifier __read_mostly = {
- .notifier_call = sh_dmae_nmi_handler,
-
- /* Run before NMI debug handler and KGDB */
- .priority = 1,
-};
-
-static int __devinit sh_dmae_chan_probe(struct sh_dmae_device *shdev, int id,
- int irq, unsigned long flags)
-{
- int err;
- const struct sh_dmae_channel *chan_pdata = &shdev->pdata->channel[id];
- struct platform_device *pdev = to_platform_device(shdev->common.dev);
- struct sh_dmae_chan *new_sh_chan;
-
- /* alloc channel */
- new_sh_chan = kzalloc(sizeof(struct sh_dmae_chan), GFP_KERNEL);
- if (!new_sh_chan) {
- dev_err(shdev->common.dev,
- "No free memory for allocating dma channels!\n");
- return -ENOMEM;
- }
-
- new_sh_chan->pm_state = DMAE_PM_ESTABLISHED;
-
- /* reference struct dma_device */
- new_sh_chan->common.device = &shdev->common;
- dma_cookie_init(&new_sh_chan->common);
-
- new_sh_chan->dev = shdev->common.dev;
- new_sh_chan->id = id;
- new_sh_chan->irq = irq;
- new_sh_chan->base = shdev->chan_reg + chan_pdata->offset / sizeof(u32);
-
- /* Init DMA tasklet */
- tasklet_init(&new_sh_chan->tasklet, dmae_do_tasklet,
- (unsigned long)new_sh_chan);
-
- spin_lock_init(&new_sh_chan->desc_lock);
-
- /* Init descripter manage list */
- INIT_LIST_HEAD(&new_sh_chan->ld_queue);
- INIT_LIST_HEAD(&new_sh_chan->ld_free);
-
- /* Add the channel to DMA device channel list */
- list_add_tail(&new_sh_chan->common.device_node,
- &shdev->common.channels);
- shdev->common.chancnt++;
-
- if (pdev->id >= 0)
- snprintf(new_sh_chan->dev_id, sizeof(new_sh_chan->dev_id),
- "sh-dmae%d.%d", pdev->id, new_sh_chan->id);
- else
- snprintf(new_sh_chan->dev_id, sizeof(new_sh_chan->dev_id),
- "sh-dma%d", new_sh_chan->id);
-
- /* set up channel irq */
- err = request_irq(irq, &sh_dmae_interrupt, flags,
- new_sh_chan->dev_id, new_sh_chan);
- if (err) {
- dev_err(shdev->common.dev, "DMA channel %d request_irq error "
- "with return %d\n", id, err);
- goto err_no_irq;
- }
-
- shdev->chan[id] = new_sh_chan;
- return 0;
-
-err_no_irq:
- /* remove from dmaengine device node */
- list_del(&new_sh_chan->common.device_node);
- kfree(new_sh_chan);
- return err;
-}
-
-static void sh_dmae_chan_remove(struct sh_dmae_device *shdev)
-{
- int i;
-
- for (i = shdev->common.chancnt - 1 ; i >= 0 ; i--) {
- if (shdev->chan[i]) {
- struct sh_dmae_chan *sh_chan = shdev->chan[i];
-
- free_irq(sh_chan->irq, sh_chan);
-
- list_del(&sh_chan->common.device_node);
- kfree(sh_chan);
- shdev->chan[i] = NULL;
- }
- }
- shdev->common.chancnt = 0;
-}
-
-static int __init sh_dmae_probe(struct platform_device *pdev)
-{
- struct sh_dmae_pdata *pdata = pdev->dev.platform_data;
- unsigned long irqflags = IRQF_DISABLED,
- chan_flag[SH_DMAC_MAX_CHANNELS] = {};
- int errirq, chan_irq[SH_DMAC_MAX_CHANNELS];
- int err, i, irq_cnt = 0, irqres = 0, irq_cap = 0;
- struct sh_dmae_device *shdev;
- struct resource *chan, *dmars, *errirq_res, *chanirq_res;
-
- /* get platform data */
- if (!pdata || !pdata->channel_num)
- return -ENODEV;
-
- chan = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- /* DMARS area is optional */
- dmars = platform_get_resource(pdev, IORESOURCE_MEM, 1);
- /*
- * IRQ resources:
- * 1. there always must be at least one IRQ IO-resource. On SH4 it is
- * the error IRQ, in which case it is the only IRQ in this resource:
- * start == end. If it is the only IRQ resource, all channels also
- * use the same IRQ.
- * 2. DMA channel IRQ resources can be specified one per resource or in
- * ranges (start != end)
- * 3. iff all events (channels and, optionally, error) on this
- * controller use the same IRQ, only one IRQ resource can be
- * specified, otherwise there must be one IRQ per channel, even if
- * some of them are equal
- * 4. if all IRQs on this controller are equal or if some specific IRQs
- * specify IORESOURCE_IRQ_SHAREABLE in their resources, they will be
- * requested with the IRQF_SHARED flag
- */
- errirq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
- if (!chan || !errirq_res)
- return -ENODEV;
-
- if (!request_mem_region(chan->start, resource_size(chan), pdev->name)) {
- dev_err(&pdev->dev, "DMAC register region already claimed\n");
- return -EBUSY;
- }
-
- if (dmars && !request_mem_region(dmars->start, resource_size(dmars), pdev->name)) {
- dev_err(&pdev->dev, "DMAC DMARS region already claimed\n");
- err = -EBUSY;
- goto ermrdmars;
- }
-
- err = -ENOMEM;
- shdev = kzalloc(sizeof(struct sh_dmae_device), GFP_KERNEL);
- if (!shdev) {
- dev_err(&pdev->dev, "Not enough memory\n");
- goto ealloc;
- }
-
- shdev->chan_reg = ioremap(chan->start, resource_size(chan));
- if (!shdev->chan_reg)
- goto emapchan;
- if (dmars) {
- shdev->dmars = ioremap(dmars->start, resource_size(dmars));
- if (!shdev->dmars)
- goto emapdmars;
- }
-
- /* platform data */
- shdev->pdata = pdata;
-
- if (pdata->chcr_offset)
- shdev->chcr_offset = pdata->chcr_offset;
- else
- shdev->chcr_offset = CHCR;
-
- if (pdata->chcr_ie_bit)
- shdev->chcr_ie_bit = pdata->chcr_ie_bit;
- else
- shdev->chcr_ie_bit = CHCR_IE;
-
- platform_set_drvdata(pdev, shdev);
-
- shdev->common.dev = &pdev->dev;
-
- pm_runtime_enable(&pdev->dev);
- pm_runtime_get_sync(&pdev->dev);
-
- spin_lock_irq(&sh_dmae_lock);
- list_add_tail_rcu(&shdev->node, &sh_dmae_devices);
- spin_unlock_irq(&sh_dmae_lock);
-
- /* reset dma controller - only needed as a test */
- err = sh_dmae_rst(shdev);
- if (err)
- goto rst_err;
-
- INIT_LIST_HEAD(&shdev->common.channels);
-
- if (!pdata->slave_only)
- dma_cap_set(DMA_MEMCPY, shdev->common.cap_mask);
- if (pdata->slave && pdata->slave_num)
- dma_cap_set(DMA_SLAVE, shdev->common.cap_mask);
-
- shdev->common.device_alloc_chan_resources
- = sh_dmae_alloc_chan_resources;
- shdev->common.device_free_chan_resources = sh_dmae_free_chan_resources;
- shdev->common.device_prep_dma_memcpy = sh_dmae_prep_memcpy;
- shdev->common.device_tx_status = sh_dmae_tx_status;
- shdev->common.device_issue_pending = sh_dmae_memcpy_issue_pending;
-
- /* Compulsory for DMA_SLAVE fields */
- shdev->common.device_prep_slave_sg = sh_dmae_prep_slave_sg;
- shdev->common.device_control = sh_dmae_control;
-
- /* Default transfer size of 32 bytes requires 32-byte alignment */
- shdev->common.copy_align = LOG2_DEFAULT_XFER_SIZE;
-
-#if defined(CONFIG_CPU_SH4) || defined(CONFIG_ARCH_SHMOBILE)
- chanirq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 1);
-
- if (!chanirq_res)
- chanirq_res = errirq_res;
- else
- irqres++;
-
- if (chanirq_res == errirq_res ||
- (errirq_res->flags & IORESOURCE_BITS) == IORESOURCE_IRQ_SHAREABLE)
- irqflags = IRQF_SHARED;
-
- errirq = errirq_res->start;
-
- err = request_irq(errirq, sh_dmae_err, irqflags,
- "DMAC Address Error", shdev);
- if (err) {
- dev_err(&pdev->dev,
- "DMA failed requesting irq #%d, error %d\n",
- errirq, err);
- goto eirq_err;
- }
-
-#else
- chanirq_res = errirq_res;
-#endif /* CONFIG_CPU_SH4 || CONFIG_ARCH_SHMOBILE */
-
- if (chanirq_res->start == chanirq_res->end &&
- !platform_get_resource(pdev, IORESOURCE_IRQ, 1)) {
- /* Special case - all multiplexed */
- for (; irq_cnt < pdata->channel_num; irq_cnt++) {
- if (irq_cnt < SH_DMAC_MAX_CHANNELS) {
- chan_irq[irq_cnt] = chanirq_res->start;
- chan_flag[irq_cnt] = IRQF_SHARED;
- } else {
- irq_cap = 1;
- break;
- }
- }
- } else {
- do {
- for (i = chanirq_res->start; i <= chanirq_res->end; i++) {
- if (irq_cnt >= SH_DMAC_MAX_CHANNELS) {
- irq_cap = 1;
- break;
- }
-
- if ((errirq_res->flags & IORESOURCE_BITS) ==
- IORESOURCE_IRQ_SHAREABLE)
- chan_flag[irq_cnt] = IRQF_SHARED;
- else
- chan_flag[irq_cnt] = IRQF_DISABLED;
- dev_dbg(&pdev->dev,
- "Found IRQ %d for channel %d\n",
- i, irq_cnt);
- chan_irq[irq_cnt++] = i;
- }
-
- if (irq_cnt >= SH_DMAC_MAX_CHANNELS)
- break;
-
- chanirq_res = platform_get_resource(pdev,
- IORESOURCE_IRQ, ++irqres);
- } while (irq_cnt < pdata->channel_num && chanirq_res);
- }
-
- /* Create DMA Channel */
- for (i = 0; i < irq_cnt; i++) {
- err = sh_dmae_chan_probe(shdev, i, chan_irq[i], chan_flag[i]);
- if (err)
- goto chan_probe_err;
- }
-
- if (irq_cap)
- dev_notice(&pdev->dev, "Attempting to register %d DMA "
- "channels when a maximum of %d are supported.\n",
- pdata->channel_num, SH_DMAC_MAX_CHANNELS);
-
- pm_runtime_put(&pdev->dev);
-
- dma_async_device_register(&shdev->common);
-
- return err;
-
-chan_probe_err:
- sh_dmae_chan_remove(shdev);
-
-#if defined(CONFIG_CPU_SH4) || defined(CONFIG_ARCH_SHMOBILE)
- free_irq(errirq, shdev);
-eirq_err:
-#endif
-rst_err:
- spin_lock_irq(&sh_dmae_lock);
- list_del_rcu(&shdev->node);
- spin_unlock_irq(&sh_dmae_lock);
-
- pm_runtime_put(&pdev->dev);
- pm_runtime_disable(&pdev->dev);
-
- if (dmars)
- iounmap(shdev->dmars);
-
- platform_set_drvdata(pdev, NULL);
-emapdmars:
- iounmap(shdev->chan_reg);
- synchronize_rcu();
-emapchan:
- kfree(shdev);
-ealloc:
- if (dmars)
- release_mem_region(dmars->start, resource_size(dmars));
-ermrdmars:
- release_mem_region(chan->start, resource_size(chan));
-
- return err;
-}
-
-static int __exit sh_dmae_remove(struct platform_device *pdev)
-{
- struct sh_dmae_device *shdev = platform_get_drvdata(pdev);
- struct resource *res;
- int errirq = platform_get_irq(pdev, 0);
-
- dma_async_device_unregister(&shdev->common);
-
- if (errirq > 0)
- free_irq(errirq, shdev);
-
- spin_lock_irq(&sh_dmae_lock);
- list_del_rcu(&shdev->node);
- spin_unlock_irq(&sh_dmae_lock);
-
- /* channel data remove */
- sh_dmae_chan_remove(shdev);
-
- pm_runtime_disable(&pdev->dev);
-
- if (shdev->dmars)
- iounmap(shdev->dmars);
- iounmap(shdev->chan_reg);
-
- platform_set_drvdata(pdev, NULL);
-
- synchronize_rcu();
- kfree(shdev);
-
- res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- if (res)
- release_mem_region(res->start, resource_size(res));
- res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
- if (res)
- release_mem_region(res->start, resource_size(res));
-
- return 0;
-}
-
-static void sh_dmae_shutdown(struct platform_device *pdev)
-{
- struct sh_dmae_device *shdev = platform_get_drvdata(pdev);
- sh_dmae_ctl_stop(shdev);
-}
-
-static int sh_dmae_runtime_suspend(struct device *dev)
-{
- return 0;
-}
-
-static int sh_dmae_runtime_resume(struct device *dev)
-{
- struct sh_dmae_device *shdev = dev_get_drvdata(dev);
-
- return sh_dmae_rst(shdev);
-}
-
-#ifdef CONFIG_PM
-static int sh_dmae_suspend(struct device *dev)
-{
- return 0;
-}
-
-static int sh_dmae_resume(struct device *dev)
-{
- struct sh_dmae_device *shdev = dev_get_drvdata(dev);
- int i, ret;
-
- ret = sh_dmae_rst(shdev);
- if (ret < 0)
- dev_err(dev, "Failed to reset!\n");
-
- for (i = 0; i < shdev->pdata->channel_num; i++) {
- struct sh_dmae_chan *sh_chan = shdev->chan[i];
- struct sh_dmae_slave *param = sh_chan->common.private;
-
- if (!sh_chan->descs_allocated)
- continue;
-
- if (param) {
- const struct sh_dmae_slave_config *cfg = param->config;
- dmae_set_dmars(sh_chan, cfg->mid_rid);
- dmae_set_chcr(sh_chan, cfg->chcr);
- } else {
- dmae_init(sh_chan);
- }
- }
-
- return 0;
-}
-#else
-#define sh_dmae_suspend NULL
-#define sh_dmae_resume NULL
-#endif
-
-const struct dev_pm_ops sh_dmae_pm = {
- .suspend = sh_dmae_suspend,
- .resume = sh_dmae_resume,
- .runtime_suspend = sh_dmae_runtime_suspend,
- .runtime_resume = sh_dmae_runtime_resume,
-};
-
-static struct platform_driver sh_dmae_driver = {
- .remove = __exit_p(sh_dmae_remove),
- .shutdown = sh_dmae_shutdown,
- .driver = {
- .owner = THIS_MODULE,
- .name = "sh-dma-engine",
- .pm = &sh_dmae_pm,
- },
-};
-
-static int __init sh_dmae_init(void)
-{
- /* Wire up NMI handling */
- int err = register_die_notifier(&sh_dmae_nmi_notifier);
- if (err)
- return err;
-
- return platform_driver_probe(&sh_dmae_driver, sh_dmae_probe);
-}
-module_init(sh_dmae_init);
-
-static void __exit sh_dmae_exit(void)
-{
- platform_driver_unregister(&sh_dmae_driver);
-
- unregister_die_notifier(&sh_dmae_nmi_notifier);
-}
-module_exit(sh_dmae_exit);
-
-MODULE_AUTHOR("Nobuhiro Iwamatsu <iwamatsu.nobuhiro@renesas.com>");
-MODULE_DESCRIPTION("Renesas SH DMA Engine driver");
-MODULE_LICENSE("GPL");
-MODULE_ALIAS("platform:sh-dma-engine");
diff --git a/drivers/dma/tegra20-apb-dma.c b/drivers/dma/tegra20-apb-dma.c
new file mode 100644
index 000000000000..d52dbc6c54ab
--- /dev/null
+++ b/drivers/dma/tegra20-apb-dma.c
@@ -0,0 +1,1415 @@
+/*
+ * DMA driver for Nvidia's Tegra20 APB DMA controller.
+ *
+ * Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/bitops.h>
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/dmaengine.h>
+#include <linux/dma-mapping.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/mm.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/slab.h>
+
+#include <mach/clk.h>
+#include "dmaengine.h"
+
+#define TEGRA_APBDMA_GENERAL 0x0
+#define TEGRA_APBDMA_GENERAL_ENABLE BIT(31)
+
+#define TEGRA_APBDMA_CONTROL 0x010
+#define TEGRA_APBDMA_IRQ_MASK 0x01c
+#define TEGRA_APBDMA_IRQ_MASK_SET 0x020
+
+/* CSR register */
+#define TEGRA_APBDMA_CHAN_CSR 0x00
+#define TEGRA_APBDMA_CSR_ENB BIT(31)
+#define TEGRA_APBDMA_CSR_IE_EOC BIT(30)
+#define TEGRA_APBDMA_CSR_HOLD BIT(29)
+#define TEGRA_APBDMA_CSR_DIR BIT(28)
+#define TEGRA_APBDMA_CSR_ONCE BIT(27)
+#define TEGRA_APBDMA_CSR_FLOW BIT(21)
+#define TEGRA_APBDMA_CSR_REQ_SEL_SHIFT 16
+#define TEGRA_APBDMA_CSR_WCOUNT_MASK 0xFFFC
+
+/* STATUS register */
+#define TEGRA_APBDMA_CHAN_STATUS 0x004
+#define TEGRA_APBDMA_STATUS_BUSY BIT(31)
+#define TEGRA_APBDMA_STATUS_ISE_EOC BIT(30)
+#define TEGRA_APBDMA_STATUS_HALT BIT(29)
+#define TEGRA_APBDMA_STATUS_PING_PONG BIT(28)
+#define TEGRA_APBDMA_STATUS_COUNT_SHIFT 2
+#define TEGRA_APBDMA_STATUS_COUNT_MASK 0xFFFC
+
+/* AHB memory address */
+#define TEGRA_APBDMA_CHAN_AHBPTR 0x010
+
+/* AHB sequence register */
+#define TEGRA_APBDMA_CHAN_AHBSEQ 0x14
+#define TEGRA_APBDMA_AHBSEQ_INTR_ENB BIT(31)
+#define TEGRA_APBDMA_AHBSEQ_BUS_WIDTH_8 (0 << 28)
+#define TEGRA_APBDMA_AHBSEQ_BUS_WIDTH_16 (1 << 28)
+#define TEGRA_APBDMA_AHBSEQ_BUS_WIDTH_32 (2 << 28)
+#define TEGRA_APBDMA_AHBSEQ_BUS_WIDTH_64 (3 << 28)
+#define TEGRA_APBDMA_AHBSEQ_BUS_WIDTH_128 (4 << 28)
+#define TEGRA_APBDMA_AHBSEQ_DATA_SWAP BIT(27)
+#define TEGRA_APBDMA_AHBSEQ_BURST_1 (4 << 24)
+#define TEGRA_APBDMA_AHBSEQ_BURST_4 (5 << 24)
+#define TEGRA_APBDMA_AHBSEQ_BURST_8 (6 << 24)
+#define TEGRA_APBDMA_AHBSEQ_DBL_BUF BIT(19)
+#define TEGRA_APBDMA_AHBSEQ_WRAP_SHIFT 16
+#define TEGRA_APBDMA_AHBSEQ_WRAP_NONE 0
+
+/* APB address */
+#define TEGRA_APBDMA_CHAN_APBPTR 0x018
+
+/* APB sequence register */
+#define TEGRA_APBDMA_CHAN_APBSEQ 0x01c
+#define TEGRA_APBDMA_APBSEQ_BUS_WIDTH_8 (0 << 28)
+#define TEGRA_APBDMA_APBSEQ_BUS_WIDTH_16 (1 << 28)
+#define TEGRA_APBDMA_APBSEQ_BUS_WIDTH_32 (2 << 28)
+#define TEGRA_APBDMA_APBSEQ_BUS_WIDTH_64 (3 << 28)
+#define TEGRA_APBDMA_APBSEQ_BUS_WIDTH_128 (4 << 28)
+#define TEGRA_APBDMA_APBSEQ_DATA_SWAP BIT(27)
+#define TEGRA_APBDMA_APBSEQ_WRAP_WORD_1 (1 << 16)
+
+/*
+ * If any burst is in flight and DMA paused then this is the time to complete
+ * on-flight burst and update DMA status register.
+ */
+#define TEGRA_APBDMA_BURST_COMPLETE_TIME 20
+
+/* Channel base address offset from APBDMA base address */
+#define TEGRA_APBDMA_CHANNEL_BASE_ADD_OFFSET 0x1000
+
+/* DMA channel register space size */
+#define TEGRA_APBDMA_CHANNEL_REGISTER_SIZE 0x20
+
+struct tegra_dma;
+
+/*
+ * tegra_dma_chip_data Tegra chip specific DMA data
+ * @nr_channels: Number of channels available in the controller.
+ * @max_dma_count: Maximum DMA transfer count supported by DMA controller.
+ */
+struct tegra_dma_chip_data {
+ int nr_channels;
+ int max_dma_count;
+};
+
+/* DMA channel registers */
+struct tegra_dma_channel_regs {
+ unsigned long csr;
+ unsigned long ahb_ptr;
+ unsigned long apb_ptr;
+ unsigned long ahb_seq;
+ unsigned long apb_seq;
+};
+
+/*
+ * tegra_dma_sg_req: Dma request details to configure hardware. This
+ * contains the details for one transfer to configure DMA hw.
+ * The client's request for data transfer can be broken into multiple
+ * sub-transfer as per requester details and hw support.
+ * This sub transfer get added in the list of transfer and point to Tegra
+ * DMA descriptor which manages the transfer details.
+ */
+struct tegra_dma_sg_req {
+ struct tegra_dma_channel_regs ch_regs;
+ int req_len;
+ bool configured;
+ bool last_sg;
+ bool half_done;
+ struct list_head node;
+ struct tegra_dma_desc *dma_desc;
+};
+
+/*
+ * tegra_dma_desc: Tegra DMA descriptors which manages the client requests.
+ * This descriptor keep track of transfer status, callbacks and request
+ * counts etc.
+ */
+struct tegra_dma_desc {
+ struct dma_async_tx_descriptor txd;
+ int bytes_requested;
+ int bytes_transferred;
+ enum dma_status dma_status;
+ struct list_head node;
+ struct list_head tx_list;
+ struct list_head cb_node;
+ int cb_count;
+};
+
+struct tegra_dma_channel;
+
+typedef void (*dma_isr_handler)(struct tegra_dma_channel *tdc,
+ bool to_terminate);
+
+/* tegra_dma_channel: Channel specific information */
+struct tegra_dma_channel {
+ struct dma_chan dma_chan;
+ bool config_init;
+ int id;
+ int irq;
+ unsigned long chan_base_offset;
+ spinlock_t lock;
+ bool busy;
+ struct tegra_dma *tdma;
+ bool cyclic;
+
+ /* Different lists for managing the requests */
+ struct list_head free_sg_req;
+ struct list_head pending_sg_req;
+ struct list_head free_dma_desc;
+ struct list_head cb_desc;
+
+ /* ISR handler and tasklet for bottom half of isr handling */
+ dma_isr_handler isr_handler;
+ struct tasklet_struct tasklet;
+ dma_async_tx_callback callback;
+ void *callback_param;
+
+ /* Channel-slave specific configuration */
+ struct dma_slave_config dma_sconfig;
+};
+
+/* tegra_dma: Tegra DMA specific information */
+struct tegra_dma {
+ struct dma_device dma_dev;
+ struct device *dev;
+ struct clk *dma_clk;
+ spinlock_t global_lock;
+ void __iomem *base_addr;
+ struct tegra_dma_chip_data *chip_data;
+
+ /* Some register need to be cache before suspend */
+ u32 reg_gen;
+
+ /* Last member of the structure */
+ struct tegra_dma_channel channels[0];
+};
+
+static inline void tdma_write(struct tegra_dma *tdma, u32 reg, u32 val)
+{
+ writel(val, tdma->base_addr + reg);
+}
+
+static inline u32 tdma_read(struct tegra_dma *tdma, u32 reg)
+{
+ return readl(tdma->base_addr + reg);
+}
+
+static inline void tdc_write(struct tegra_dma_channel *tdc,
+ u32 reg, u32 val)
+{
+ writel(val, tdc->tdma->base_addr + tdc->chan_base_offset + reg);
+}
+
+static inline u32 tdc_read(struct tegra_dma_channel *tdc, u32 reg)
+{
+ return readl(tdc->tdma->base_addr + tdc->chan_base_offset + reg);
+}
+
+static inline struct tegra_dma_channel *to_tegra_dma_chan(struct dma_chan *dc)
+{
+ return container_of(dc, struct tegra_dma_channel, dma_chan);
+}
+
+static inline struct tegra_dma_desc *txd_to_tegra_dma_desc(
+ struct dma_async_tx_descriptor *td)
+{
+ return container_of(td, struct tegra_dma_desc, txd);
+}
+
+static inline struct device *tdc2dev(struct tegra_dma_channel *tdc)
+{
+ return &tdc->dma_chan.dev->device;
+}
+
+static dma_cookie_t tegra_dma_tx_submit(struct dma_async_tx_descriptor *tx);
+static int tegra_dma_runtime_suspend(struct device *dev);
+static int tegra_dma_runtime_resume(struct device *dev);
+
+/* Get DMA desc from free list, if not there then allocate it. */
+static struct tegra_dma_desc *tegra_dma_desc_get(
+ struct tegra_dma_channel *tdc)
+{
+ struct tegra_dma_desc *dma_desc;
+ unsigned long flags;
+
+ spin_lock_irqsave(&tdc->lock, flags);
+
+ /* Do not allocate if desc are waiting for ack */
+ list_for_each_entry(dma_desc, &tdc->free_dma_desc, node) {
+ if (async_tx_test_ack(&dma_desc->txd)) {
+ list_del(&dma_desc->node);
+ spin_unlock_irqrestore(&tdc->lock, flags);
+ return dma_desc;
+ }
+ }
+
+ spin_unlock_irqrestore(&tdc->lock, flags);
+
+ /* Allocate DMA desc */
+ dma_desc = kzalloc(sizeof(*dma_desc), GFP_ATOMIC);
+ if (!dma_desc) {
+ dev_err(tdc2dev(tdc), "dma_desc alloc failed\n");
+ return NULL;
+ }
+
+ dma_async_tx_descriptor_init(&dma_desc->txd, &tdc->dma_chan);
+ dma_desc->txd.tx_submit = tegra_dma_tx_submit;
+ dma_desc->txd.flags = 0;
+ return dma_desc;
+}
+
+static void tegra_dma_desc_put(struct tegra_dma_channel *tdc,
+ struct tegra_dma_desc *dma_desc)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&tdc->lock, flags);
+ if (!list_empty(&dma_desc->tx_list))
+ list_splice_init(&dma_desc->tx_list, &tdc->free_sg_req);
+ list_add_tail(&dma_desc->node, &tdc->free_dma_desc);
+ spin_unlock_irqrestore(&tdc->lock, flags);
+}
+
+static struct tegra_dma_sg_req *tegra_dma_sg_req_get(
+ struct tegra_dma_channel *tdc)
+{
+ struct tegra_dma_sg_req *sg_req = NULL;
+ unsigned long flags;
+
+ spin_lock_irqsave(&tdc->lock, flags);
+ if (!list_empty(&tdc->free_sg_req)) {
+ sg_req = list_first_entry(&tdc->free_sg_req,
+ typeof(*sg_req), node);
+ list_del(&sg_req->node);
+ spin_unlock_irqrestore(&tdc->lock, flags);
+ return sg_req;
+ }
+ spin_unlock_irqrestore(&tdc->lock, flags);
+
+ sg_req = kzalloc(sizeof(struct tegra_dma_sg_req), GFP_ATOMIC);
+ if (!sg_req)
+ dev_err(tdc2dev(tdc), "sg_req alloc failed\n");
+ return sg_req;
+}
+
+static int tegra_dma_slave_config(struct dma_chan *dc,
+ struct dma_slave_config *sconfig)
+{
+ struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
+
+ if (!list_empty(&tdc->pending_sg_req)) {
+ dev_err(tdc2dev(tdc), "Configuration not allowed\n");
+ return -EBUSY;
+ }
+
+ memcpy(&tdc->dma_sconfig, sconfig, sizeof(*sconfig));
+ tdc->config_init = true;
+ return 0;
+}
+
+static void tegra_dma_global_pause(struct tegra_dma_channel *tdc,
+ bool wait_for_burst_complete)
+{
+ struct tegra_dma *tdma = tdc->tdma;
+
+ spin_lock(&tdma->global_lock);
+ tdma_write(tdma, TEGRA_APBDMA_GENERAL, 0);
+ if (wait_for_burst_complete)
+ udelay(TEGRA_APBDMA_BURST_COMPLETE_TIME);
+}
+
+static void tegra_dma_global_resume(struct tegra_dma_channel *tdc)
+{
+ struct tegra_dma *tdma = tdc->tdma;
+
+ tdma_write(tdma, TEGRA_APBDMA_GENERAL, TEGRA_APBDMA_GENERAL_ENABLE);
+ spin_unlock(&tdma->global_lock);
+}
+
+static void tegra_dma_stop(struct tegra_dma_channel *tdc)
+{
+ u32 csr;
+ u32 status;
+
+ /* Disable interrupts */
+ csr = tdc_read(tdc, TEGRA_APBDMA_CHAN_CSR);
+ csr &= ~TEGRA_APBDMA_CSR_IE_EOC;
+ tdc_write(tdc, TEGRA_APBDMA_CHAN_CSR, csr);
+
+ /* Disable DMA */
+ csr &= ~TEGRA_APBDMA_CSR_ENB;
+ tdc_write(tdc, TEGRA_APBDMA_CHAN_CSR, csr);
+
+ /* Clear interrupt status if it is there */
+ status = tdc_read(tdc, TEGRA_APBDMA_CHAN_STATUS);
+ if (status & TEGRA_APBDMA_STATUS_ISE_EOC) {
+ dev_dbg(tdc2dev(tdc), "%s():clearing interrupt\n", __func__);
+ tdc_write(tdc, TEGRA_APBDMA_CHAN_STATUS, status);
+ }
+ tdc->busy = false;
+}
+
+static void tegra_dma_start(struct tegra_dma_channel *tdc,
+ struct tegra_dma_sg_req *sg_req)
+{
+ struct tegra_dma_channel_regs *ch_regs = &sg_req->ch_regs;
+
+ tdc_write(tdc, TEGRA_APBDMA_CHAN_CSR, ch_regs->csr);
+ tdc_write(tdc, TEGRA_APBDMA_CHAN_APBSEQ, ch_regs->apb_seq);
+ tdc_write(tdc, TEGRA_APBDMA_CHAN_APBPTR, ch_regs->apb_ptr);
+ tdc_write(tdc, TEGRA_APBDMA_CHAN_AHBSEQ, ch_regs->ahb_seq);
+ tdc_write(tdc, TEGRA_APBDMA_CHAN_AHBPTR, ch_regs->ahb_ptr);
+
+ /* Start DMA */
+ tdc_write(tdc, TEGRA_APBDMA_CHAN_CSR,
+ ch_regs->csr | TEGRA_APBDMA_CSR_ENB);
+}
+
+static void tegra_dma_configure_for_next(struct tegra_dma_channel *tdc,
+ struct tegra_dma_sg_req *nsg_req)
+{
+ unsigned long status;
+
+ /*
+ * The DMA controller reloads the new configuration for next transfer
+ * after last burst of current transfer completes.
+ * If there is no IEC status then this makes sure that last burst
+ * has not be completed. There may be case that last burst is on
+ * flight and so it can complete but because DMA is paused, it
+ * will not generates interrupt as well as not reload the new
+ * configuration.
+ * If there is already IEC status then interrupt handler need to
+ * load new configuration.
+ */
+ tegra_dma_global_pause(tdc, false);
+ status = tdc_read(tdc, TEGRA_APBDMA_CHAN_STATUS);
+
+ /*
+ * If interrupt is pending then do nothing as the ISR will handle
+ * the programing for new request.
+ */
+ if (status & TEGRA_APBDMA_STATUS_ISE_EOC) {
+ dev_err(tdc2dev(tdc),
+ "Skipping new configuration as interrupt is pending\n");
+ tegra_dma_global_resume(tdc);
+ return;
+ }
+
+ /* Safe to program new configuration */
+ tdc_write(tdc, TEGRA_APBDMA_CHAN_APBPTR, nsg_req->ch_regs.apb_ptr);
+ tdc_write(tdc, TEGRA_APBDMA_CHAN_AHBPTR, nsg_req->ch_regs.ahb_ptr);
+ tdc_write(tdc, TEGRA_APBDMA_CHAN_CSR,
+ nsg_req->ch_regs.csr | TEGRA_APBDMA_CSR_ENB);
+ nsg_req->configured = true;
+
+ tegra_dma_global_resume(tdc);
+}
+
+static void tdc_start_head_req(struct tegra_dma_channel *tdc)
+{
+ struct tegra_dma_sg_req *sg_req;
+
+ if (list_empty(&tdc->pending_sg_req))
+ return;
+
+ sg_req = list_first_entry(&tdc->pending_sg_req,
+ typeof(*sg_req), node);
+ tegra_dma_start(tdc, sg_req);
+ sg_req->configured = true;
+ tdc->busy = true;
+}
+
+static void tdc_configure_next_head_desc(struct tegra_dma_channel *tdc)
+{
+ struct tegra_dma_sg_req *hsgreq;
+ struct tegra_dma_sg_req *hnsgreq;
+
+ if (list_empty(&tdc->pending_sg_req))
+ return;
+
+ hsgreq = list_first_entry(&tdc->pending_sg_req, typeof(*hsgreq), node);
+ if (!list_is_last(&hsgreq->node, &tdc->pending_sg_req)) {
+ hnsgreq = list_first_entry(&hsgreq->node,
+ typeof(*hnsgreq), node);
+ tegra_dma_configure_for_next(tdc, hnsgreq);
+ }
+}
+
+static inline int get_current_xferred_count(struct tegra_dma_channel *tdc,
+ struct tegra_dma_sg_req *sg_req, unsigned long status)
+{
+ return sg_req->req_len - (status & TEGRA_APBDMA_STATUS_COUNT_MASK) - 4;
+}
+
+static void tegra_dma_abort_all(struct tegra_dma_channel *tdc)
+{
+ struct tegra_dma_sg_req *sgreq;
+ struct tegra_dma_desc *dma_desc;
+
+ while (!list_empty(&tdc->pending_sg_req)) {
+ sgreq = list_first_entry(&tdc->pending_sg_req,
+ typeof(*sgreq), node);
+ list_del(&sgreq->node);
+ list_add_tail(&sgreq->node, &tdc->free_sg_req);
+ if (sgreq->last_sg) {
+ dma_desc = sgreq->dma_desc;
+ dma_desc->dma_status = DMA_ERROR;
+ list_add_tail(&dma_desc->node, &tdc->free_dma_desc);
+
+ /* Add in cb list if it is not there. */
+ if (!dma_desc->cb_count)
+ list_add_tail(&dma_desc->cb_node,
+ &tdc->cb_desc);
+ dma_desc->cb_count++;
+ }
+ }
+ tdc->isr_handler = NULL;
+}
+
+static bool handle_continuous_head_request(struct tegra_dma_channel *tdc,
+ struct tegra_dma_sg_req *last_sg_req, bool to_terminate)
+{
+ struct tegra_dma_sg_req *hsgreq = NULL;
+
+ if (list_empty(&tdc->pending_sg_req)) {
+ dev_err(tdc2dev(tdc), "Dma is running without req\n");
+ tegra_dma_stop(tdc);
+ return false;
+ }
+
+ /*
+ * Check that head req on list should be in flight.
+ * If it is not in flight then abort transfer as
+ * looping of transfer can not continue.
+ */
+ hsgreq = list_first_entry(&tdc->pending_sg_req, typeof(*hsgreq), node);
+ if (!hsgreq->configured) {
+ tegra_dma_stop(tdc);
+ dev_err(tdc2dev(tdc), "Error in dma transfer, aborting dma\n");
+ tegra_dma_abort_all(tdc);
+ return false;
+ }
+
+ /* Configure next request */
+ if (!to_terminate)
+ tdc_configure_next_head_desc(tdc);
+ return true;
+}
+
+static void handle_once_dma_done(struct tegra_dma_channel *tdc,
+ bool to_terminate)
+{
+ struct tegra_dma_sg_req *sgreq;
+ struct tegra_dma_desc *dma_desc;
+
+ tdc->busy = false;
+ sgreq = list_first_entry(&tdc->pending_sg_req, typeof(*sgreq), node);
+ dma_desc = sgreq->dma_desc;
+ dma_desc->bytes_transferred += sgreq->req_len;
+
+ list_del(&sgreq->node);
+ if (sgreq->last_sg) {
+ dma_desc->dma_status = DMA_SUCCESS;
+ dma_cookie_complete(&dma_desc->txd);
+ if (!dma_desc->cb_count)
+ list_add_tail(&dma_desc->cb_node, &tdc->cb_desc);
+ dma_desc->cb_count++;
+ list_add_tail(&dma_desc->node, &tdc->free_dma_desc);
+ }
+ list_add_tail(&sgreq->node, &tdc->free_sg_req);
+
+ /* Do not start DMA if it is going to be terminate */
+ if (to_terminate || list_empty(&tdc->pending_sg_req))
+ return;
+
+ tdc_start_head_req(tdc);
+ return;
+}
+
+static void handle_cont_sngl_cycle_dma_done(struct tegra_dma_channel *tdc,
+ bool to_terminate)
+{
+ struct tegra_dma_sg_req *sgreq;
+ struct tegra_dma_desc *dma_desc;
+ bool st;
+
+ sgreq = list_first_entry(&tdc->pending_sg_req, typeof(*sgreq), node);
+ dma_desc = sgreq->dma_desc;
+ dma_desc->bytes_transferred += sgreq->req_len;
+
+ /* Callback need to be call */
+ if (!dma_desc->cb_count)
+ list_add_tail(&dma_desc->cb_node, &tdc->cb_desc);
+ dma_desc->cb_count++;
+
+ /* If not last req then put at end of pending list */
+ if (!list_is_last(&sgreq->node, &tdc->pending_sg_req)) {
+ list_del(&sgreq->node);
+ list_add_tail(&sgreq->node, &tdc->pending_sg_req);
+ sgreq->configured = false;
+ st = handle_continuous_head_request(tdc, sgreq, to_terminate);
+ if (!st)
+ dma_desc->dma_status = DMA_ERROR;
+ }
+ return;
+}
+
+static void tegra_dma_tasklet(unsigned long data)
+{
+ struct tegra_dma_channel *tdc = (struct tegra_dma_channel *)data;
+ dma_async_tx_callback callback = NULL;
+ void *callback_param = NULL;
+ struct tegra_dma_desc *dma_desc;
+ unsigned long flags;
+ int cb_count;
+
+ spin_lock_irqsave(&tdc->lock, flags);
+ while (!list_empty(&tdc->cb_desc)) {
+ dma_desc = list_first_entry(&tdc->cb_desc,
+ typeof(*dma_desc), cb_node);
+ list_del(&dma_desc->cb_node);
+ callback = dma_desc->txd.callback;
+ callback_param = dma_desc->txd.callback_param;
+ cb_count = dma_desc->cb_count;
+ dma_desc->cb_count = 0;
+ spin_unlock_irqrestore(&tdc->lock, flags);
+ while (cb_count-- && callback)
+ callback(callback_param);
+ spin_lock_irqsave(&tdc->lock, flags);
+ }
+ spin_unlock_irqrestore(&tdc->lock, flags);
+}
+
+static irqreturn_t tegra_dma_isr(int irq, void *dev_id)
+{
+ struct tegra_dma_channel *tdc = dev_id;
+ unsigned long status;
+ unsigned long flags;
+
+ spin_lock_irqsave(&tdc->lock, flags);
+
+ status = tdc_read(tdc, TEGRA_APBDMA_CHAN_STATUS);
+ if (status & TEGRA_APBDMA_STATUS_ISE_EOC) {
+ tdc_write(tdc, TEGRA_APBDMA_CHAN_STATUS, status);
+ tdc->isr_handler(tdc, false);
+ tasklet_schedule(&tdc->tasklet);
+ spin_unlock_irqrestore(&tdc->lock, flags);
+ return IRQ_HANDLED;
+ }
+
+ spin_unlock_irqrestore(&tdc->lock, flags);
+ dev_info(tdc2dev(tdc),
+ "Interrupt already served status 0x%08lx\n", status);
+ return IRQ_NONE;
+}
+
+static dma_cookie_t tegra_dma_tx_submit(struct dma_async_tx_descriptor *txd)
+{
+ struct tegra_dma_desc *dma_desc = txd_to_tegra_dma_desc(txd);
+ struct tegra_dma_channel *tdc = to_tegra_dma_chan(txd->chan);
+ unsigned long flags;
+ dma_cookie_t cookie;
+
+ spin_lock_irqsave(&tdc->lock, flags);
+ dma_desc->dma_status = DMA_IN_PROGRESS;
+ cookie = dma_cookie_assign(&dma_desc->txd);
+ list_splice_tail_init(&dma_desc->tx_list, &tdc->pending_sg_req);
+ spin_unlock_irqrestore(&tdc->lock, flags);
+ return cookie;
+}
+
+static void tegra_dma_issue_pending(struct dma_chan *dc)
+{
+ struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
+ unsigned long flags;
+
+ spin_lock_irqsave(&tdc->lock, flags);
+ if (list_empty(&tdc->pending_sg_req)) {
+ dev_err(tdc2dev(tdc), "No DMA request\n");
+ goto end;
+ }
+ if (!tdc->busy) {
+ tdc_start_head_req(tdc);
+
+ /* Continuous single mode: Configure next req */
+ if (tdc->cyclic) {
+ /*
+ * Wait for 1 burst time for configure DMA for
+ * next transfer.
+ */
+ udelay(TEGRA_APBDMA_BURST_COMPLETE_TIME);
+ tdc_configure_next_head_desc(tdc);
+ }
+ }
+end:
+ spin_unlock_irqrestore(&tdc->lock, flags);
+ return;
+}
+
+static void tegra_dma_terminate_all(struct dma_chan *dc)
+{
+ struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
+ struct tegra_dma_sg_req *sgreq;
+ struct tegra_dma_desc *dma_desc;
+ unsigned long flags;
+ unsigned long status;
+ bool was_busy;
+
+ spin_lock_irqsave(&tdc->lock, flags);
+ if (list_empty(&tdc->pending_sg_req)) {
+ spin_unlock_irqrestore(&tdc->lock, flags);
+ return;
+ }
+
+ if (!tdc->busy)
+ goto skip_dma_stop;
+
+ /* Pause DMA before checking the queue status */
+ tegra_dma_global_pause(tdc, true);
+
+ status = tdc_read(tdc, TEGRA_APBDMA_CHAN_STATUS);
+ if (status & TEGRA_APBDMA_STATUS_ISE_EOC) {
+ dev_dbg(tdc2dev(tdc), "%s():handling isr\n", __func__);
+ tdc->isr_handler(tdc, true);
+ status = tdc_read(tdc, TEGRA_APBDMA_CHAN_STATUS);
+ }
+
+ was_busy = tdc->busy;
+ tegra_dma_stop(tdc);
+
+ if (!list_empty(&tdc->pending_sg_req) && was_busy) {
+ sgreq = list_first_entry(&tdc->pending_sg_req,
+ typeof(*sgreq), node);
+ sgreq->dma_desc->bytes_transferred +=
+ get_current_xferred_count(tdc, sgreq, status);
+ }
+ tegra_dma_global_resume(tdc);
+
+skip_dma_stop:
+ tegra_dma_abort_all(tdc);
+
+ while (!list_empty(&tdc->cb_desc)) {
+ dma_desc = list_first_entry(&tdc->cb_desc,
+ typeof(*dma_desc), cb_node);
+ list_del(&dma_desc->cb_node);
+ dma_desc->cb_count = 0;
+ }
+ spin_unlock_irqrestore(&tdc->lock, flags);
+}
+
+static enum dma_status tegra_dma_tx_status(struct dma_chan *dc,
+ dma_cookie_t cookie, struct dma_tx_state *txstate)
+{
+ struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
+ struct tegra_dma_desc *dma_desc;
+ struct tegra_dma_sg_req *sg_req;
+ enum dma_status ret;
+ unsigned long flags;
+ unsigned int residual;
+
+ spin_lock_irqsave(&tdc->lock, flags);
+
+ ret = dma_cookie_status(dc, cookie, txstate);
+ if (ret == DMA_SUCCESS) {
+ dma_set_residue(txstate, 0);
+ spin_unlock_irqrestore(&tdc->lock, flags);
+ return ret;
+ }
+
+ /* Check on wait_ack desc status */
+ list_for_each_entry(dma_desc, &tdc->free_dma_desc, node) {
+ if (dma_desc->txd.cookie == cookie) {
+ residual = dma_desc->bytes_requested -
+ (dma_desc->bytes_transferred %
+ dma_desc->bytes_requested);
+ dma_set_residue(txstate, residual);
+ ret = dma_desc->dma_status;
+ spin_unlock_irqrestore(&tdc->lock, flags);
+ return ret;
+ }
+ }
+
+ /* Check in pending list */
+ list_for_each_entry(sg_req, &tdc->pending_sg_req, node) {
+ dma_desc = sg_req->dma_desc;
+ if (dma_desc->txd.cookie == cookie) {
+ residual = dma_desc->bytes_requested -
+ (dma_desc->bytes_transferred %
+ dma_desc->bytes_requested);
+ dma_set_residue(txstate, residual);
+ ret = dma_desc->dma_status;
+ spin_unlock_irqrestore(&tdc->lock, flags);
+ return ret;
+ }
+ }
+
+ dev_dbg(tdc2dev(tdc), "cookie %d does not found\n", cookie);
+ spin_unlock_irqrestore(&tdc->lock, flags);
+ return ret;
+}
+
+static int tegra_dma_device_control(struct dma_chan *dc, enum dma_ctrl_cmd cmd,
+ unsigned long arg)
+{
+ switch (cmd) {
+ case DMA_SLAVE_CONFIG:
+ return tegra_dma_slave_config(dc,
+ (struct dma_slave_config *)arg);
+
+ case DMA_TERMINATE_ALL:
+ tegra_dma_terminate_all(dc);
+ return 0;
+
+ default:
+ break;
+ }
+
+ return -ENXIO;
+}
+
+static inline int get_bus_width(struct tegra_dma_channel *tdc,
+ enum dma_slave_buswidth slave_bw)
+{
+ switch (slave_bw) {
+ case DMA_SLAVE_BUSWIDTH_1_BYTE:
+ return TEGRA_APBDMA_APBSEQ_BUS_WIDTH_8;
+ case DMA_SLAVE_BUSWIDTH_2_BYTES:
+ return TEGRA_APBDMA_APBSEQ_BUS_WIDTH_16;
+ case DMA_SLAVE_BUSWIDTH_4_BYTES:
+ return TEGRA_APBDMA_APBSEQ_BUS_WIDTH_32;
+ case DMA_SLAVE_BUSWIDTH_8_BYTES:
+ return TEGRA_APBDMA_APBSEQ_BUS_WIDTH_64;
+ default:
+ dev_warn(tdc2dev(tdc),
+ "slave bw is not supported, using 32bits\n");
+ return TEGRA_APBDMA_APBSEQ_BUS_WIDTH_32;
+ }
+}
+
+static inline int get_burst_size(struct tegra_dma_channel *tdc,
+ u32 burst_size, enum dma_slave_buswidth slave_bw, int len)
+{
+ int burst_byte;
+ int burst_ahb_width;
+
+ /*
+ * burst_size from client is in terms of the bus_width.
+ * convert them into AHB memory width which is 4 byte.
+ */
+ burst_byte = burst_size * slave_bw;
+ burst_ahb_width = burst_byte / 4;
+
+ /* If burst size is 0 then calculate the burst size based on length */
+ if (!burst_ahb_width) {
+ if (len & 0xF)
+ return TEGRA_APBDMA_AHBSEQ_BURST_1;
+ else if ((len >> 4) & 0x1)
+ return TEGRA_APBDMA_AHBSEQ_BURST_4;
+ else
+ return TEGRA_APBDMA_AHBSEQ_BURST_8;
+ }
+ if (burst_ahb_width < 4)
+ return TEGRA_APBDMA_AHBSEQ_BURST_1;
+ else if (burst_ahb_width < 8)
+ return TEGRA_APBDMA_AHBSEQ_BURST_4;
+ else
+ return TEGRA_APBDMA_AHBSEQ_BURST_8;
+}
+
+static int get_transfer_param(struct tegra_dma_channel *tdc,
+ enum dma_transfer_direction direction, unsigned long *apb_addr,
+ unsigned long *apb_seq, unsigned long *csr, unsigned int *burst_size,
+ enum dma_slave_buswidth *slave_bw)
+{
+
+ switch (direction) {
+ case DMA_MEM_TO_DEV:
+ *apb_addr = tdc->dma_sconfig.dst_addr;
+ *apb_seq = get_bus_width(tdc, tdc->dma_sconfig.dst_addr_width);
+ *burst_size = tdc->dma_sconfig.dst_maxburst;
+ *slave_bw = tdc->dma_sconfig.dst_addr_width;
+ *csr = TEGRA_APBDMA_CSR_DIR;
+ return 0;
+
+ case DMA_DEV_TO_MEM:
+ *apb_addr = tdc->dma_sconfig.src_addr;
+ *apb_seq = get_bus_width(tdc, tdc->dma_sconfig.src_addr_width);
+ *burst_size = tdc->dma_sconfig.src_maxburst;
+ *slave_bw = tdc->dma_sconfig.src_addr_width;
+ *csr = 0;
+ return 0;
+
+ default:
+ dev_err(tdc2dev(tdc), "Dma direction is not supported\n");
+ return -EINVAL;
+ }
+ return -EINVAL;
+}
+
+static struct dma_async_tx_descriptor *tegra_dma_prep_slave_sg(
+ struct dma_chan *dc, struct scatterlist *sgl, unsigned int sg_len,
+ enum dma_transfer_direction direction, unsigned long flags,
+ void *context)
+{
+ struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
+ struct tegra_dma_desc *dma_desc;
+ unsigned int i;
+ struct scatterlist *sg;
+ unsigned long csr, ahb_seq, apb_ptr, apb_seq;
+ struct list_head req_list;
+ struct tegra_dma_sg_req *sg_req = NULL;
+ u32 burst_size;
+ enum dma_slave_buswidth slave_bw;
+ int ret;
+
+ if (!tdc->config_init) {
+ dev_err(tdc2dev(tdc), "dma channel is not configured\n");
+ return NULL;
+ }
+ if (sg_len < 1) {
+ dev_err(tdc2dev(tdc), "Invalid segment length %d\n", sg_len);
+ return NULL;
+ }
+
+ ret = get_transfer_param(tdc, direction, &apb_ptr, &apb_seq, &csr,
+ &burst_size, &slave_bw);
+ if (ret < 0)
+ return NULL;
+
+ INIT_LIST_HEAD(&req_list);
+
+ ahb_seq = TEGRA_APBDMA_AHBSEQ_INTR_ENB;
+ ahb_seq |= TEGRA_APBDMA_AHBSEQ_WRAP_NONE <<
+ TEGRA_APBDMA_AHBSEQ_WRAP_SHIFT;
+ ahb_seq |= TEGRA_APBDMA_AHBSEQ_BUS_WIDTH_32;
+
+ csr |= TEGRA_APBDMA_CSR_ONCE | TEGRA_APBDMA_CSR_FLOW;
+ csr |= tdc->dma_sconfig.slave_id << TEGRA_APBDMA_CSR_REQ_SEL_SHIFT;
+ if (flags & DMA_PREP_INTERRUPT)
+ csr |= TEGRA_APBDMA_CSR_IE_EOC;
+
+ apb_seq |= TEGRA_APBDMA_APBSEQ_WRAP_WORD_1;
+
+ dma_desc = tegra_dma_desc_get(tdc);
+ if (!dma_desc) {
+ dev_err(tdc2dev(tdc), "Dma descriptors not available\n");
+ return NULL;
+ }
+ INIT_LIST_HEAD(&dma_desc->tx_list);
+ INIT_LIST_HEAD(&dma_desc->cb_node);
+ dma_desc->cb_count = 0;
+ dma_desc->bytes_requested = 0;
+ dma_desc->bytes_transferred = 0;
+ dma_desc->dma_status = DMA_IN_PROGRESS;
+
+ /* Make transfer requests */
+ for_each_sg(sgl, sg, sg_len, i) {
+ u32 len, mem;
+
+ mem = sg_dma_address(sg);
+ len = sg_dma_len(sg);
+
+ if ((len & 3) || (mem & 3) ||
+ (len > tdc->tdma->chip_data->max_dma_count)) {
+ dev_err(tdc2dev(tdc),
+ "Dma length/memory address is not supported\n");
+ tegra_dma_desc_put(tdc, dma_desc);
+ return NULL;
+ }
+
+ sg_req = tegra_dma_sg_req_get(tdc);
+ if (!sg_req) {
+ dev_err(tdc2dev(tdc), "Dma sg-req not available\n");
+ tegra_dma_desc_put(tdc, dma_desc);
+ return NULL;
+ }
+
+ ahb_seq |= get_burst_size(tdc, burst_size, slave_bw, len);
+ dma_desc->bytes_requested += len;
+
+ sg_req->ch_regs.apb_ptr = apb_ptr;
+ sg_req->ch_regs.ahb_ptr = mem;
+ sg_req->ch_regs.csr = csr | ((len - 4) & 0xFFFC);
+ sg_req->ch_regs.apb_seq = apb_seq;
+ sg_req->ch_regs.ahb_seq = ahb_seq;
+ sg_req->configured = false;
+ sg_req->last_sg = false;
+ sg_req->dma_desc = dma_desc;
+ sg_req->req_len = len;
+
+ list_add_tail(&sg_req->node, &dma_desc->tx_list);
+ }
+ sg_req->last_sg = true;
+ if (flags & DMA_CTRL_ACK)
+ dma_desc->txd.flags = DMA_CTRL_ACK;
+
+ /*
+ * Make sure that mode should not be conflicting with currently
+ * configured mode.
+ */
+ if (!tdc->isr_handler) {
+ tdc->isr_handler = handle_once_dma_done;
+ tdc->cyclic = false;
+ } else {
+ if (tdc->cyclic) {
+ dev_err(tdc2dev(tdc), "DMA configured in cyclic mode\n");
+ tegra_dma_desc_put(tdc, dma_desc);
+ return NULL;
+ }
+ }
+
+ return &dma_desc->txd;
+}
+
+struct dma_async_tx_descriptor *tegra_dma_prep_dma_cyclic(
+ struct dma_chan *dc, dma_addr_t buf_addr, size_t buf_len,
+ size_t period_len, enum dma_transfer_direction direction,
+ void *context)
+{
+ struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
+ struct tegra_dma_desc *dma_desc = NULL;
+ struct tegra_dma_sg_req *sg_req = NULL;
+ unsigned long csr, ahb_seq, apb_ptr, apb_seq;
+ int len;
+ size_t remain_len;
+ dma_addr_t mem = buf_addr;
+ u32 burst_size;
+ enum dma_slave_buswidth slave_bw;
+ int ret;
+
+ if (!buf_len || !period_len) {
+ dev_err(tdc2dev(tdc), "Invalid buffer/period len\n");
+ return NULL;
+ }
+
+ if (!tdc->config_init) {
+ dev_err(tdc2dev(tdc), "DMA slave is not configured\n");
+ return NULL;
+ }
+
+ /*
+ * We allow to take more number of requests till DMA is
+ * not started. The driver will loop over all requests.
+ * Once DMA is started then new requests can be queued only after
+ * terminating the DMA.
+ */
+ if (tdc->busy) {
+ dev_err(tdc2dev(tdc), "Request not allowed when dma running\n");
+ return NULL;
+ }
+
+ /*
+ * We only support cycle transfer when buf_len is multiple of
+ * period_len.
+ */
+ if (buf_len % period_len) {
+ dev_err(tdc2dev(tdc), "buf_len is not multiple of period_len\n");
+ return NULL;
+ }
+
+ len = period_len;
+ if ((len & 3) || (buf_addr & 3) ||
+ (len > tdc->tdma->chip_data->max_dma_count)) {
+ dev_err(tdc2dev(tdc), "Req len/mem address is not correct\n");
+ return NULL;
+ }
+
+ ret = get_transfer_param(tdc, direction, &apb_ptr, &apb_seq, &csr,
+ &burst_size, &slave_bw);
+ if (ret < 0)
+ return NULL;
+
+
+ ahb_seq = TEGRA_APBDMA_AHBSEQ_INTR_ENB;
+ ahb_seq |= TEGRA_APBDMA_AHBSEQ_WRAP_NONE <<
+ TEGRA_APBDMA_AHBSEQ_WRAP_SHIFT;
+ ahb_seq |= TEGRA_APBDMA_AHBSEQ_BUS_WIDTH_32;
+
+ csr |= TEGRA_APBDMA_CSR_FLOW | TEGRA_APBDMA_CSR_IE_EOC;
+ csr |= tdc->dma_sconfig.slave_id << TEGRA_APBDMA_CSR_REQ_SEL_SHIFT;
+
+ apb_seq |= TEGRA_APBDMA_APBSEQ_WRAP_WORD_1;
+
+ dma_desc = tegra_dma_desc_get(tdc);
+ if (!dma_desc) {
+ dev_err(tdc2dev(tdc), "not enough descriptors available\n");
+ return NULL;
+ }
+
+ INIT_LIST_HEAD(&dma_desc->tx_list);
+ INIT_LIST_HEAD(&dma_desc->cb_node);
+ dma_desc->cb_count = 0;
+
+ dma_desc->bytes_transferred = 0;
+ dma_desc->bytes_requested = buf_len;
+ remain_len = buf_len;
+
+ /* Split transfer equal to period size */
+ while (remain_len) {
+ sg_req = tegra_dma_sg_req_get(tdc);
+ if (!sg_req) {
+ dev_err(tdc2dev(tdc), "Dma sg-req not available\n");
+ tegra_dma_desc_put(tdc, dma_desc);
+ return NULL;
+ }
+
+ ahb_seq |= get_burst_size(tdc, burst_size, slave_bw, len);
+ sg_req->ch_regs.apb_ptr = apb_ptr;
+ sg_req->ch_regs.ahb_ptr = mem;
+ sg_req->ch_regs.csr = csr | ((len - 4) & 0xFFFC);
+ sg_req->ch_regs.apb_seq = apb_seq;
+ sg_req->ch_regs.ahb_seq = ahb_seq;
+ sg_req->configured = false;
+ sg_req->half_done = false;
+ sg_req->last_sg = false;
+ sg_req->dma_desc = dma_desc;
+ sg_req->req_len = len;
+
+ list_add_tail(&sg_req->node, &dma_desc->tx_list);
+ remain_len -= len;
+ mem += len;
+ }
+ sg_req->last_sg = true;
+ dma_desc->txd.flags = 0;
+
+ /*
+ * Make sure that mode should not be conflicting with currently
+ * configured mode.
+ */
+ if (!tdc->isr_handler) {
+ tdc->isr_handler = handle_cont_sngl_cycle_dma_done;
+ tdc->cyclic = true;
+ } else {
+ if (!tdc->cyclic) {
+ dev_err(tdc2dev(tdc), "DMA configuration conflict\n");
+ tegra_dma_desc_put(tdc, dma_desc);
+ return NULL;
+ }
+ }
+
+ return &dma_desc->txd;
+}
+
+static int tegra_dma_alloc_chan_resources(struct dma_chan *dc)
+{
+ struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
+
+ dma_cookie_init(&tdc->dma_chan);
+ tdc->config_init = false;
+ return 0;
+}
+
+static void tegra_dma_free_chan_resources(struct dma_chan *dc)
+{
+ struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
+
+ struct tegra_dma_desc *dma_desc;
+ struct tegra_dma_sg_req *sg_req;
+ struct list_head dma_desc_list;
+ struct list_head sg_req_list;
+ unsigned long flags;
+
+ INIT_LIST_HEAD(&dma_desc_list);
+ INIT_LIST_HEAD(&sg_req_list);
+
+ dev_dbg(tdc2dev(tdc), "Freeing channel %d\n", tdc->id);
+
+ if (tdc->busy)
+ tegra_dma_terminate_all(dc);
+
+ spin_lock_irqsave(&tdc->lock, flags);
+ list_splice_init(&tdc->pending_sg_req, &sg_req_list);
+ list_splice_init(&tdc->free_sg_req, &sg_req_list);
+ list_splice_init(&tdc->free_dma_desc, &dma_desc_list);
+ INIT_LIST_HEAD(&tdc->cb_desc);
+ tdc->config_init = false;
+ spin_unlock_irqrestore(&tdc->lock, flags);
+
+ while (!list_empty(&dma_desc_list)) {
+ dma_desc = list_first_entry(&dma_desc_list,
+ typeof(*dma_desc), node);
+ list_del(&dma_desc->node);
+ kfree(dma_desc);
+ }
+
+ while (!list_empty(&sg_req_list)) {
+ sg_req = list_first_entry(&sg_req_list, typeof(*sg_req), node);
+ list_del(&sg_req->node);
+ kfree(sg_req);
+ }
+}
+
+/* Tegra20 specific DMA controller information */
+static struct tegra_dma_chip_data tegra20_dma_chip_data = {
+ .nr_channels = 16,
+ .max_dma_count = 1024UL * 64,
+};
+
+#if defined(CONFIG_OF)
+/* Tegra30 specific DMA controller information */
+static struct tegra_dma_chip_data tegra30_dma_chip_data = {
+ .nr_channels = 32,
+ .max_dma_count = 1024UL * 64,
+};
+
+static const struct of_device_id tegra_dma_of_match[] __devinitconst = {
+ {
+ .compatible = "nvidia,tegra30-apbdma",
+ .data = &tegra30_dma_chip_data,
+ }, {
+ .compatible = "nvidia,tegra20-apbdma",
+ .data = &tegra20_dma_chip_data,
+ }, {
+ },
+};
+MODULE_DEVICE_TABLE(of, tegra_dma_of_match);
+#endif
+
+static int __devinit tegra_dma_probe(struct platform_device *pdev)
+{
+ struct resource *res;
+ struct tegra_dma *tdma;
+ int ret;
+ int i;
+ struct tegra_dma_chip_data *cdata = NULL;
+
+ if (pdev->dev.of_node) {
+ const struct of_device_id *match;
+ match = of_match_device(of_match_ptr(tegra_dma_of_match),
+ &pdev->dev);
+ if (!match) {
+ dev_err(&pdev->dev, "Error: No device match found\n");
+ return -ENODEV;
+ }
+ cdata = match->data;
+ } else {
+ /* If no device tree then fallback to tegra20 */
+ cdata = &tegra20_dma_chip_data;
+ }
+
+ tdma = devm_kzalloc(&pdev->dev, sizeof(*tdma) + cdata->nr_channels *
+ sizeof(struct tegra_dma_channel), GFP_KERNEL);
+ if (!tdma) {
+ dev_err(&pdev->dev, "Error: memory allocation failed\n");
+ return -ENOMEM;
+ }
+
+ tdma->dev = &pdev->dev;
+ tdma->chip_data = cdata;
+ platform_set_drvdata(pdev, tdma);
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res) {
+ dev_err(&pdev->dev, "No mem resource for DMA\n");
+ return -EINVAL;
+ }
+
+ tdma->base_addr = devm_request_and_ioremap(&pdev->dev, res);
+ if (!tdma->base_addr) {
+ dev_err(&pdev->dev,
+ "Cannot request memregion/iomap dma address\n");
+ return -EADDRNOTAVAIL;
+ }
+
+ tdma->dma_clk = devm_clk_get(&pdev->dev, NULL);
+ if (IS_ERR(tdma->dma_clk)) {
+ dev_err(&pdev->dev, "Error: Missing controller clock\n");
+ return PTR_ERR(tdma->dma_clk);
+ }
+
+ spin_lock_init(&tdma->global_lock);
+
+ pm_runtime_enable(&pdev->dev);
+ if (!pm_runtime_enabled(&pdev->dev)) {
+ ret = tegra_dma_runtime_resume(&pdev->dev);
+ if (ret) {
+ dev_err(&pdev->dev, "dma_runtime_resume failed %d\n",
+ ret);
+ goto err_pm_disable;
+ }
+ }
+
+ /* Reset DMA controller */
+ tegra_periph_reset_assert(tdma->dma_clk);
+ udelay(2);
+ tegra_periph_reset_deassert(tdma->dma_clk);
+
+ /* Enable global DMA registers */
+ tdma_write(tdma, TEGRA_APBDMA_GENERAL, TEGRA_APBDMA_GENERAL_ENABLE);
+ tdma_write(tdma, TEGRA_APBDMA_CONTROL, 0);
+ tdma_write(tdma, TEGRA_APBDMA_IRQ_MASK_SET, 0xFFFFFFFFul);
+
+ INIT_LIST_HEAD(&tdma->dma_dev.channels);
+ for (i = 0; i < cdata->nr_channels; i++) {
+ struct tegra_dma_channel *tdc = &tdma->channels[i];
+ char irq_name[30];
+
+ tdc->chan_base_offset = TEGRA_APBDMA_CHANNEL_BASE_ADD_OFFSET +
+ i * TEGRA_APBDMA_CHANNEL_REGISTER_SIZE;
+
+ res = platform_get_resource(pdev, IORESOURCE_IRQ, i);
+ if (!res) {
+ ret = -EINVAL;
+ dev_err(&pdev->dev, "No irq resource for chan %d\n", i);
+ goto err_irq;
+ }
+ tdc->irq = res->start;
+ snprintf(irq_name, sizeof(irq_name), "apbdma.%d", i);
+ ret = devm_request_irq(&pdev->dev, tdc->irq,
+ tegra_dma_isr, 0, irq_name, tdc);
+ if (ret) {
+ dev_err(&pdev->dev,
+ "request_irq failed with err %d channel %d\n",
+ i, ret);
+ goto err_irq;
+ }
+
+ tdc->dma_chan.device = &tdma->dma_dev;
+ dma_cookie_init(&tdc->dma_chan);
+ list_add_tail(&tdc->dma_chan.device_node,
+ &tdma->dma_dev.channels);
+ tdc->tdma = tdma;
+ tdc->id = i;
+
+ tasklet_init(&tdc->tasklet, tegra_dma_tasklet,
+ (unsigned long)tdc);
+ spin_lock_init(&tdc->lock);
+
+ INIT_LIST_HEAD(&tdc->pending_sg_req);
+ INIT_LIST_HEAD(&tdc->free_sg_req);
+ INIT_LIST_HEAD(&tdc->free_dma_desc);
+ INIT_LIST_HEAD(&tdc->cb_desc);
+ }
+
+ dma_cap_set(DMA_SLAVE, tdma->dma_dev.cap_mask);
+ dma_cap_set(DMA_PRIVATE, tdma->dma_dev.cap_mask);
+ dma_cap_set(DMA_CYCLIC, tdma->dma_dev.cap_mask);
+
+ tdma->dma_dev.dev = &pdev->dev;
+ tdma->dma_dev.device_alloc_chan_resources =
+ tegra_dma_alloc_chan_resources;
+ tdma->dma_dev.device_free_chan_resources =
+ tegra_dma_free_chan_resources;
+ tdma->dma_dev.device_prep_slave_sg = tegra_dma_prep_slave_sg;
+ tdma->dma_dev.device_prep_dma_cyclic = tegra_dma_prep_dma_cyclic;
+ tdma->dma_dev.device_control = tegra_dma_device_control;
+ tdma->dma_dev.device_tx_status = tegra_dma_tx_status;
+ tdma->dma_dev.device_issue_pending = tegra_dma_issue_pending;
+
+ ret = dma_async_device_register(&tdma->dma_dev);
+ if (ret < 0) {
+ dev_err(&pdev->dev,
+ "Tegra20 APB DMA driver registration failed %d\n", ret);
+ goto err_irq;
+ }
+
+ dev_info(&pdev->dev, "Tegra20 APB DMA driver register %d channels\n",
+ cdata->nr_channels);
+ return 0;
+
+err_irq:
+ while (--i >= 0) {
+ struct tegra_dma_channel *tdc = &tdma->channels[i];
+ tasklet_kill(&tdc->tasklet);
+ }
+
+err_pm_disable:
+ pm_runtime_disable(&pdev->dev);
+ if (!pm_runtime_status_suspended(&pdev->dev))
+ tegra_dma_runtime_suspend(&pdev->dev);
+ return ret;
+}
+
+static int __devexit tegra_dma_remove(struct platform_device *pdev)
+{
+ struct tegra_dma *tdma = platform_get_drvdata(pdev);
+ int i;
+ struct tegra_dma_channel *tdc;
+
+ dma_async_device_unregister(&tdma->dma_dev);
+
+ for (i = 0; i < tdma->chip_data->nr_channels; ++i) {
+ tdc = &tdma->channels[i];
+ tasklet_kill(&tdc->tasklet);
+ }
+
+ pm_runtime_disable(&pdev->dev);
+ if (!pm_runtime_status_suspended(&pdev->dev))
+ tegra_dma_runtime_suspend(&pdev->dev);
+
+ return 0;
+}
+
+static int tegra_dma_runtime_suspend(struct device *dev)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct tegra_dma *tdma = platform_get_drvdata(pdev);
+
+ clk_disable_unprepare(tdma->dma_clk);
+ return 0;
+}
+
+static int tegra_dma_runtime_resume(struct device *dev)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct tegra_dma *tdma = platform_get_drvdata(pdev);
+ int ret;
+
+ ret = clk_prepare_enable(tdma->dma_clk);
+ if (ret < 0) {
+ dev_err(dev, "clk_enable failed: %d\n", ret);
+ return ret;
+ }
+ return 0;
+}
+
+static const struct dev_pm_ops tegra_dma_dev_pm_ops __devinitconst = {
+#ifdef CONFIG_PM_RUNTIME
+ .runtime_suspend = tegra_dma_runtime_suspend,
+ .runtime_resume = tegra_dma_runtime_resume,
+#endif
+};
+
+static struct platform_driver tegra_dmac_driver = {
+ .driver = {
+ .name = "tegra-apbdma",
+ .owner = THIS_MODULE,
+ .pm = &tegra_dma_dev_pm_ops,
+ .of_match_table = of_match_ptr(tegra_dma_of_match),
+ },
+ .probe = tegra_dma_probe,
+ .remove = __devexit_p(tegra_dma_remove),
+};
+
+module_platform_driver(tegra_dmac_driver);
+
+MODULE_ALIAS("platform:tegra20-apbdma");
+MODULE_DESCRIPTION("NVIDIA Tegra APB DMA Controller driver");
+MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
+MODULE_LICENSE("GPL v2");
generated by cgit v1.2.3 (git 2.25.1) at 2024-04-28 02:51:35 +0000