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path: root/drivers/dma/intel_mid_dma.c
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Diffstat (limited to 'drivers/dma/intel_mid_dma.c')
-rw-r--r--drivers/dma/intel_mid_dma.c476
1 files changed, 390 insertions, 86 deletions
diff --git a/drivers/dma/intel_mid_dma.c b/drivers/dma/intel_mid_dma.c
index c2591e8d9b6..338bc4eed1f 100644
--- a/drivers/dma/intel_mid_dma.c
+++ b/drivers/dma/intel_mid_dma.c
@@ -25,6 +25,7 @@
*/
#include <linux/pci.h>
#include <linux/interrupt.h>
+#include <linux/pm_runtime.h>
#include <linux/intel_mid_dma.h>
#define MAX_CHAN 4 /*max ch across controllers*/
@@ -91,13 +92,13 @@ static int get_block_ts(int len, int tx_width, int block_size)
int byte_width = 0, block_ts = 0;
switch (tx_width) {
- case LNW_DMA_WIDTH_8BIT:
+ case DMA_SLAVE_BUSWIDTH_1_BYTE:
byte_width = 1;
break;
- case LNW_DMA_WIDTH_16BIT:
+ case DMA_SLAVE_BUSWIDTH_2_BYTES:
byte_width = 2;
break;
- case LNW_DMA_WIDTH_32BIT:
+ case DMA_SLAVE_BUSWIDTH_4_BYTES:
default:
byte_width = 4;
break;
@@ -247,16 +248,17 @@ static void midc_dostart(struct intel_mid_dma_chan *midc,
struct middma_device *mid = to_middma_device(midc->chan.device);
/* channel is idle */
- if (midc->in_use && test_ch_en(midc->dma_base, midc->ch_id)) {
+ if (midc->busy && test_ch_en(midc->dma_base, midc->ch_id)) {
/*error*/
pr_err("ERR_MDMA: channel is busy in start\n");
/* The tasklet will hopefully advance the queue... */
return;
}
-
+ midc->busy = true;
/*write registers and en*/
iowrite32(first->sar, midc->ch_regs + SAR);
iowrite32(first->dar, midc->ch_regs + DAR);
+ iowrite32(first->lli_phys, midc->ch_regs + LLP);
iowrite32(first->cfg_hi, midc->ch_regs + CFG_HIGH);
iowrite32(first->cfg_lo, midc->ch_regs + CFG_LOW);
iowrite32(first->ctl_lo, midc->ch_regs + CTL_LOW);
@@ -264,9 +266,9 @@ static void midc_dostart(struct intel_mid_dma_chan *midc,
pr_debug("MDMA:TX SAR %x,DAR %x,CFGL %x,CFGH %x,CTLH %x, CTLL %x\n",
(int)first->sar, (int)first->dar, first->cfg_hi,
first->cfg_lo, first->ctl_hi, first->ctl_lo);
+ first->status = DMA_IN_PROGRESS;
iowrite32(ENABLE_CHANNEL(midc->ch_id), mid->dma_base + DMA_CHAN_EN);
- first->status = DMA_IN_PROGRESS;
}
/**
@@ -283,20 +285,36 @@ static void midc_descriptor_complete(struct intel_mid_dma_chan *midc,
{
struct dma_async_tx_descriptor *txd = &desc->txd;
dma_async_tx_callback callback_txd = NULL;
+ struct intel_mid_dma_lli *llitem;
void *param_txd = NULL;
midc->completed = txd->cookie;
callback_txd = txd->callback;
param_txd = txd->callback_param;
- list_move(&desc->desc_node, &midc->free_list);
-
+ if (desc->lli != NULL) {
+ /*clear the DONE bit of completed LLI in memory*/
+ llitem = desc->lli + desc->current_lli;
+ llitem->ctl_hi &= CLEAR_DONE;
+ if (desc->current_lli < desc->lli_length-1)
+ (desc->current_lli)++;
+ else
+ desc->current_lli = 0;
+ }
spin_unlock_bh(&midc->lock);
if (callback_txd) {
pr_debug("MDMA: TXD callback set ... calling\n");
callback_txd(param_txd);
- spin_lock_bh(&midc->lock);
- return;
+ }
+ if (midc->raw_tfr) {
+ desc->status = DMA_SUCCESS;
+ if (desc->lli != NULL) {
+ pci_pool_free(desc->lli_pool, desc->lli,
+ desc->lli_phys);
+ pci_pool_destroy(desc->lli_pool);
+ }
+ list_move(&desc->desc_node, &midc->free_list);
+ midc->busy = false;
}
spin_lock_bh(&midc->lock);
@@ -317,14 +335,89 @@ static void midc_scan_descriptors(struct middma_device *mid,
/*tx is complete*/
list_for_each_entry_safe(desc, _desc, &midc->active_list, desc_node) {
- if (desc->status == DMA_IN_PROGRESS) {
- desc->status = DMA_SUCCESS;
+ if (desc->status == DMA_IN_PROGRESS)
midc_descriptor_complete(midc, desc);
- }
}
return;
-}
+ }
+/**
+ * midc_lli_fill_sg - Helper function to convert
+ * SG list to Linked List Items.
+ *@midc: Channel
+ *@desc: DMA descriptor
+ *@sglist: Pointer to SG list
+ *@sglen: SG list length
+ *@flags: DMA transaction flags
+ *
+ * Walk through the SG list and convert the SG list into Linked
+ * List Items (LLI).
+ */
+static int midc_lli_fill_sg(struct intel_mid_dma_chan *midc,
+ struct intel_mid_dma_desc *desc,
+ struct scatterlist *sglist,
+ unsigned int sglen,
+ unsigned int flags)
+{
+ struct intel_mid_dma_slave *mids;
+ struct scatterlist *sg;
+ dma_addr_t lli_next, sg_phy_addr;
+ struct intel_mid_dma_lli *lli_bloc_desc;
+ union intel_mid_dma_ctl_lo ctl_lo;
+ union intel_mid_dma_ctl_hi ctl_hi;
+ int i;
+ pr_debug("MDMA: Entered midc_lli_fill_sg\n");
+ mids = midc->mid_slave;
+
+ lli_bloc_desc = desc->lli;
+ lli_next = desc->lli_phys;
+
+ ctl_lo.ctl_lo = desc->ctl_lo;
+ ctl_hi.ctl_hi = desc->ctl_hi;
+ for_each_sg(sglist, sg, sglen, i) {
+ /*Populate CTL_LOW and LLI values*/
+ if (i != sglen - 1) {
+ lli_next = lli_next +
+ sizeof(struct intel_mid_dma_lli);
+ } else {
+ /*Check for circular list, otherwise terminate LLI to ZERO*/
+ if (flags & DMA_PREP_CIRCULAR_LIST) {
+ pr_debug("MDMA: LLI is configured in circular mode\n");
+ lli_next = desc->lli_phys;
+ } else {
+ lli_next = 0;
+ ctl_lo.ctlx.llp_dst_en = 0;
+ ctl_lo.ctlx.llp_src_en = 0;
+ }
+ }
+ /*Populate CTL_HI values*/
+ ctl_hi.ctlx.block_ts = get_block_ts(sg->length,
+ desc->width,
+ midc->dma->block_size);
+ /*Populate SAR and DAR values*/
+ sg_phy_addr = sg_phys(sg);
+ if (desc->dirn == DMA_TO_DEVICE) {
+ lli_bloc_desc->sar = sg_phy_addr;
+ lli_bloc_desc->dar = mids->dma_slave.dst_addr;
+ } else if (desc->dirn == DMA_FROM_DEVICE) {
+ lli_bloc_desc->sar = mids->dma_slave.src_addr;
+ lli_bloc_desc->dar = sg_phy_addr;
+ }
+ /*Copy values into block descriptor in system memroy*/
+ lli_bloc_desc->llp = lli_next;
+ lli_bloc_desc->ctl_lo = ctl_lo.ctl_lo;
+ lli_bloc_desc->ctl_hi = ctl_hi.ctl_hi;
+
+ lli_bloc_desc++;
+ }
+ /*Copy very first LLI values to descriptor*/
+ desc->ctl_lo = desc->lli->ctl_lo;
+ desc->ctl_hi = desc->lli->ctl_hi;
+ desc->sar = desc->lli->sar;
+ desc->dar = desc->lli->dar;
+
+ return 0;
+}
/*****************************************************************************
DMA engine callback Functions*/
/**
@@ -349,12 +442,12 @@ static dma_cookie_t intel_mid_dma_tx_submit(struct dma_async_tx_descriptor *tx)
desc->txd.cookie = cookie;
- if (list_empty(&midc->active_list)) {
- midc_dostart(midc, desc);
+ if (list_empty(&midc->active_list))
list_add_tail(&desc->desc_node, &midc->active_list);
- } else {
+ else
list_add_tail(&desc->desc_node, &midc->queue);
- }
+
+ midc_dostart(midc, desc);
spin_unlock_bh(&midc->lock);
return cookie;
@@ -414,6 +507,23 @@ static enum dma_status intel_mid_dma_tx_status(struct dma_chan *chan,
return ret;
}
+static int dma_slave_control(struct dma_chan *chan, unsigned long arg)
+{
+ struct intel_mid_dma_chan *midc = to_intel_mid_dma_chan(chan);
+ struct dma_slave_config *slave = (struct dma_slave_config *)arg;
+ struct intel_mid_dma_slave *mid_slave;
+
+ BUG_ON(!midc);
+ BUG_ON(!slave);
+ pr_debug("MDMA: slave control called\n");
+
+ mid_slave = to_intel_mid_dma_slave(slave);
+
+ BUG_ON(!mid_slave);
+
+ midc->mid_slave = mid_slave;
+ return 0;
+}
/**
* intel_mid_dma_device_control - DMA device control
* @chan: chan for DMA control
@@ -428,49 +538,41 @@ static int intel_mid_dma_device_control(struct dma_chan *chan,
struct intel_mid_dma_chan *midc = to_intel_mid_dma_chan(chan);
struct middma_device *mid = to_middma_device(chan->device);
struct intel_mid_dma_desc *desc, *_desc;
- LIST_HEAD(list);
+ union intel_mid_dma_cfg_lo cfg_lo;
+
+ if (cmd == DMA_SLAVE_CONFIG)
+ return dma_slave_control(chan, arg);
if (cmd != DMA_TERMINATE_ALL)
return -ENXIO;
spin_lock_bh(&midc->lock);
- if (midc->in_use == false) {
+ if (midc->busy == false) {
spin_unlock_bh(&midc->lock);
return 0;
}
- list_splice_init(&midc->free_list, &list);
- midc->descs_allocated = 0;
- midc->slave = NULL;
-
+ /*Suspend and disable the channel*/
+ cfg_lo.cfg_lo = ioread32(midc->ch_regs + CFG_LOW);
+ cfg_lo.cfgx.ch_susp = 1;
+ iowrite32(cfg_lo.cfg_lo, midc->ch_regs + CFG_LOW);
+ iowrite32(DISABLE_CHANNEL(midc->ch_id), mid->dma_base + DMA_CHAN_EN);
+ midc->busy = false;
/* Disable interrupts */
disable_dma_interrupt(midc);
+ midc->descs_allocated = 0;
spin_unlock_bh(&midc->lock);
- list_for_each_entry_safe(desc, _desc, &list, desc_node) {
- pr_debug("MDMA: freeing descriptor %p\n", desc);
- pci_pool_free(mid->dma_pool, desc, desc->txd.phys);
+ list_for_each_entry_safe(desc, _desc, &midc->active_list, desc_node) {
+ if (desc->lli != NULL) {
+ pci_pool_free(desc->lli_pool, desc->lli,
+ desc->lli_phys);
+ pci_pool_destroy(desc->lli_pool);
+ }
+ list_move(&desc->desc_node, &midc->free_list);
}
return 0;
}
-/**
- * intel_mid_dma_prep_slave_sg - Prep slave sg txn
- * @chan: chan for DMA transfer
- * @sgl: scatter gather list
- * @sg_len: length of sg txn
- * @direction: DMA transfer dirtn
- * @flags: DMA flags
- *
- * Do DMA sg txn: NOT supported now
- */
-static struct dma_async_tx_descriptor *intel_mid_dma_prep_slave_sg(
- struct dma_chan *chan, struct scatterlist *sgl,
- unsigned int sg_len, enum dma_data_direction direction,
- unsigned long flags)
-{
- /*not supported now*/
- return NULL;
-}
/**
* intel_mid_dma_prep_memcpy - Prep memcpy txn
@@ -495,23 +597,24 @@ static struct dma_async_tx_descriptor *intel_mid_dma_prep_memcpy(
union intel_mid_dma_ctl_hi ctl_hi;
union intel_mid_dma_cfg_lo cfg_lo;
union intel_mid_dma_cfg_hi cfg_hi;
- enum intel_mid_dma_width width = 0;
+ enum dma_slave_buswidth width;
pr_debug("MDMA: Prep for memcpy\n");
- WARN_ON(!chan);
+ BUG_ON(!chan);
if (!len)
return NULL;
- mids = chan->private;
- WARN_ON(!mids);
-
midc = to_intel_mid_dma_chan(chan);
- WARN_ON(!midc);
+ BUG_ON(!midc);
+
+ mids = midc->mid_slave;
+ BUG_ON(!mids);
pr_debug("MDMA:called for DMA %x CH %d Length %zu\n",
midc->dma->pci_id, midc->ch_id, len);
pr_debug("MDMA:Cfg passed Mode %x, Dirn %x, HS %x, Width %x\n",
- mids->cfg_mode, mids->dirn, mids->hs_mode, mids->src_width);
+ mids->cfg_mode, mids->dma_slave.direction,
+ mids->hs_mode, mids->dma_slave.src_addr_width);
/*calculate CFG_LO*/
if (mids->hs_mode == LNW_DMA_SW_HS) {
@@ -530,13 +633,13 @@ static struct dma_async_tx_descriptor *intel_mid_dma_prep_memcpy(
if (midc->dma->pimr_mask) {
cfg_hi.cfgx.protctl = 0x0; /*default value*/
cfg_hi.cfgx.fifo_mode = 1;
- if (mids->dirn == DMA_TO_DEVICE) {
+ if (mids->dma_slave.direction == DMA_TO_DEVICE) {
cfg_hi.cfgx.src_per = 0;
if (mids->device_instance == 0)
cfg_hi.cfgx.dst_per = 3;
if (mids->device_instance == 1)
cfg_hi.cfgx.dst_per = 1;
- } else if (mids->dirn == DMA_FROM_DEVICE) {
+ } else if (mids->dma_slave.direction == DMA_FROM_DEVICE) {
if (mids->device_instance == 0)
cfg_hi.cfgx.src_per = 2;
if (mids->device_instance == 1)
@@ -552,7 +655,8 @@ static struct dma_async_tx_descriptor *intel_mid_dma_prep_memcpy(
/*calculate CTL_HI*/
ctl_hi.ctlx.reser = 0;
- width = mids->src_width;
+ ctl_hi.ctlx.done = 0;
+ width = mids->dma_slave.src_addr_width;
ctl_hi.ctlx.block_ts = get_block_ts(len, width, midc->dma->block_size);
pr_debug("MDMA:calc len %d for block size %d\n",
@@ -560,21 +664,21 @@ static struct dma_async_tx_descriptor *intel_mid_dma_prep_memcpy(
/*calculate CTL_LO*/
ctl_lo.ctl_lo = 0;
ctl_lo.ctlx.int_en = 1;
- ctl_lo.ctlx.dst_tr_width = mids->dst_width;
- ctl_lo.ctlx.src_tr_width = mids->src_width;
- ctl_lo.ctlx.dst_msize = mids->src_msize;
- ctl_lo.ctlx.src_msize = mids->dst_msize;
+ ctl_lo.ctlx.dst_tr_width = mids->dma_slave.dst_addr_width;
+ ctl_lo.ctlx.src_tr_width = mids->dma_slave.src_addr_width;
+ ctl_lo.ctlx.dst_msize = mids->dma_slave.src_maxburst;
+ ctl_lo.ctlx.src_msize = mids->dma_slave.dst_maxburst;
if (mids->cfg_mode == LNW_DMA_MEM_TO_MEM) {
ctl_lo.ctlx.tt_fc = 0;
ctl_lo.ctlx.sinc = 0;
ctl_lo.ctlx.dinc = 0;
} else {
- if (mids->dirn == DMA_TO_DEVICE) {
+ if (mids->dma_slave.direction == DMA_TO_DEVICE) {
ctl_lo.ctlx.sinc = 0;
ctl_lo.ctlx.dinc = 2;
ctl_lo.ctlx.tt_fc = 1;
- } else if (mids->dirn == DMA_FROM_DEVICE) {
+ } else if (mids->dma_slave.direction == DMA_FROM_DEVICE) {
ctl_lo.ctlx.sinc = 2;
ctl_lo.ctlx.dinc = 0;
ctl_lo.ctlx.tt_fc = 2;
@@ -597,7 +701,10 @@ static struct dma_async_tx_descriptor *intel_mid_dma_prep_memcpy(
desc->ctl_lo = ctl_lo.ctl_lo;
desc->ctl_hi = ctl_hi.ctl_hi;
desc->width = width;
- desc->dirn = mids->dirn;
+ desc->dirn = mids->dma_slave.direction;
+ desc->lli_phys = 0;
+ desc->lli = NULL;
+ desc->lli_pool = NULL;
return &desc->txd;
err_desc_get:
@@ -605,6 +712,85 @@ err_desc_get:
midc_desc_put(midc, desc);
return NULL;
}
+/**
+ * intel_mid_dma_prep_slave_sg - Prep slave sg txn
+ * @chan: chan for DMA transfer
+ * @sgl: scatter gather list
+ * @sg_len: length of sg txn
+ * @direction: DMA transfer dirtn
+ * @flags: DMA flags
+ *
+ * Prepares LLI based periphral transfer
+ */
+static struct dma_async_tx_descriptor *intel_mid_dma_prep_slave_sg(
+ struct dma_chan *chan, struct scatterlist *sgl,
+ unsigned int sg_len, enum dma_data_direction direction,
+ unsigned long flags)
+{
+ struct intel_mid_dma_chan *midc = NULL;
+ struct intel_mid_dma_slave *mids = NULL;
+ struct intel_mid_dma_desc *desc = NULL;
+ struct dma_async_tx_descriptor *txd = NULL;
+ union intel_mid_dma_ctl_lo ctl_lo;
+
+ pr_debug("MDMA: Prep for slave SG\n");
+
+ if (!sg_len) {
+ pr_err("MDMA: Invalid SG length\n");
+ return NULL;
+ }
+ midc = to_intel_mid_dma_chan(chan);
+ BUG_ON(!midc);
+
+ mids = midc->mid_slave;
+ BUG_ON(!mids);
+
+ if (!midc->dma->pimr_mask) {
+ pr_debug("MDMA: SG list is not supported by this controller\n");
+ return NULL;
+ }
+
+ pr_debug("MDMA: SG Length = %d, direction = %d, Flags = %#lx\n",
+ sg_len, direction, flags);
+
+ txd = intel_mid_dma_prep_memcpy(chan, 0, 0, sgl->length, flags);
+ if (NULL == txd) {
+ pr_err("MDMA: Prep memcpy failed\n");
+ return NULL;
+ }
+ desc = to_intel_mid_dma_desc(txd);
+ desc->dirn = direction;
+ ctl_lo.ctl_lo = desc->ctl_lo;
+ ctl_lo.ctlx.llp_dst_en = 1;
+ ctl_lo.ctlx.llp_src_en = 1;
+ desc->ctl_lo = ctl_lo.ctl_lo;
+ desc->lli_length = sg_len;
+ desc->current_lli = 0;
+ /* DMA coherent memory pool for LLI descriptors*/
+ desc->lli_pool = pci_pool_create("intel_mid_dma_lli_pool",
+ midc->dma->pdev,
+ (sizeof(struct intel_mid_dma_lli)*sg_len),
+ 32, 0);
+ if (NULL == desc->lli_pool) {
+ pr_err("MID_DMA:LLI pool create failed\n");
+ return NULL;
+ }
+
+ desc->lli = pci_pool_alloc(desc->lli_pool, GFP_KERNEL, &desc->lli_phys);
+ if (!desc->lli) {
+ pr_err("MID_DMA: LLI alloc failed\n");
+ pci_pool_destroy(desc->lli_pool);
+ return NULL;
+ }
+
+ midc_lli_fill_sg(midc, desc, sgl, sg_len, flags);
+ if (flags & DMA_PREP_INTERRUPT) {
+ iowrite32(UNMASK_INTR_REG(midc->ch_id),
+ midc->dma_base + MASK_BLOCK);
+ pr_debug("MDMA:Enabled Block interrupt\n");
+ }
+ return &desc->txd;
+}
/**
* intel_mid_dma_free_chan_resources - Frees dma resources
@@ -618,11 +804,11 @@ static void intel_mid_dma_free_chan_resources(struct dma_chan *chan)
struct middma_device *mid = to_middma_device(chan->device);
struct intel_mid_dma_desc *desc, *_desc;
- if (true == midc->in_use) {
+ if (true == midc->busy) {
/*trying to free ch in use!!!!!*/
pr_err("ERR_MDMA: trying to free ch in use\n");
}
-
+ pm_runtime_put(&mid->pdev->dev);
spin_lock_bh(&midc->lock);
midc->descs_allocated = 0;
list_for_each_entry_safe(desc, _desc, &midc->active_list, desc_node) {
@@ -639,6 +825,7 @@ static void intel_mid_dma_free_chan_resources(struct dma_chan *chan)
}
spin_unlock_bh(&midc->lock);
midc->in_use = false;
+ midc->busy = false;
/* Disable CH interrupts */
iowrite32(MASK_INTR_REG(midc->ch_id), mid->dma_base + MASK_BLOCK);
iowrite32(MASK_INTR_REG(midc->ch_id), mid->dma_base + MASK_ERR);
@@ -659,11 +846,20 @@ static int intel_mid_dma_alloc_chan_resources(struct dma_chan *chan)
dma_addr_t phys;
int i = 0;
+ pm_runtime_get_sync(&mid->pdev->dev);
+
+ if (mid->state == SUSPENDED) {
+ if (dma_resume(mid->pdev)) {
+ pr_err("ERR_MDMA: resume failed");
+ return -EFAULT;
+ }
+ }
/* ASSERT: channel is idle */
if (test_ch_en(mid->dma_base, midc->ch_id)) {
/*ch is not idle*/
pr_err("ERR_MDMA: ch not idle\n");
+ pm_runtime_put(&mid->pdev->dev);
return -EIO;
}
midc->completed = chan->cookie = 1;
@@ -674,6 +870,7 @@ static int intel_mid_dma_alloc_chan_resources(struct dma_chan *chan)
desc = pci_pool_alloc(mid->dma_pool, GFP_KERNEL, &phys);
if (!desc) {
pr_err("ERR_MDMA: desc failed\n");
+ pm_runtime_put(&mid->pdev->dev);
return -ENOMEM;
/*check*/
}
@@ -686,7 +883,8 @@ static int intel_mid_dma_alloc_chan_resources(struct dma_chan *chan)
list_add_tail(&desc->desc_node, &midc->free_list);
}
spin_unlock_bh(&midc->lock);
- midc->in_use = false;
+ midc->in_use = true;
+ midc->busy = false;
pr_debug("MID_DMA: Desc alloc done ret: %d desc\n", i);
return i;
}
@@ -715,7 +913,7 @@ static void dma_tasklet(unsigned long data)
{
struct middma_device *mid = NULL;
struct intel_mid_dma_chan *midc = NULL;
- u32 status;
+ u32 status, raw_tfr, raw_block;
int i;
mid = (struct middma_device *)data;
@@ -724,8 +922,9 @@ static void dma_tasklet(unsigned long data)
return;
}
pr_debug("MDMA: in tasklet for device %x\n", mid->pci_id);
- status = ioread32(mid->dma_base + RAW_TFR);
- pr_debug("MDMA:RAW_TFR %x\n", status);
+ raw_tfr = ioread32(mid->dma_base + RAW_TFR);
+ raw_block = ioread32(mid->dma_base + RAW_BLOCK);
+ status = raw_tfr | raw_block;
status &= mid->intr_mask;
while (status) {
/*txn interrupt*/
@@ -741,15 +940,23 @@ static void dma_tasklet(unsigned long data)
}
pr_debug("MDMA:Tx complete interrupt %x, Ch No %d Index %d\n",
status, midc->ch_id, i);
+ midc->raw_tfr = raw_tfr;
+ midc->raw_block = raw_block;
+ spin_lock_bh(&midc->lock);
/*clearing this interrupts first*/
iowrite32((1 << midc->ch_id), mid->dma_base + CLEAR_TFR);
- iowrite32((1 << midc->ch_id), mid->dma_base + CLEAR_BLOCK);
-
- spin_lock_bh(&midc->lock);
+ if (raw_block) {
+ iowrite32((1 << midc->ch_id),
+ mid->dma_base + CLEAR_BLOCK);
+ }
midc_scan_descriptors(mid, midc);
pr_debug("MDMA:Scan of desc... complete, unmasking\n");
iowrite32(UNMASK_INTR_REG(midc->ch_id),
mid->dma_base + MASK_TFR);
+ if (raw_block) {
+ iowrite32(UNMASK_INTR_REG(midc->ch_id),
+ mid->dma_base + MASK_BLOCK);
+ }
spin_unlock_bh(&midc->lock);
}
@@ -804,9 +1011,14 @@ static void dma_tasklet2(unsigned long data)
static irqreturn_t intel_mid_dma_interrupt(int irq, void *data)
{
struct middma_device *mid = data;
- u32 status;
+ u32 tfr_status, err_status;
int call_tasklet = 0;
+ tfr_status = ioread32(mid->dma_base + RAW_TFR);
+ err_status = ioread32(mid->dma_base + RAW_ERR);
+ if (!tfr_status && !err_status)
+ return IRQ_NONE;
+
/*DMA Interrupt*/
pr_debug("MDMA:Got an interrupt on irq %d\n", irq);
if (!mid) {
@@ -814,19 +1026,18 @@ static irqreturn_t intel_mid_dma_interrupt(int irq, void *data)
return -EINVAL;
}
- status = ioread32(mid->dma_base + RAW_TFR);
- pr_debug("MDMA: Status %x, Mask %x\n", status, mid->intr_mask);
- status &= mid->intr_mask;
- if (status) {
+ pr_debug("MDMA: Status %x, Mask %x\n", tfr_status, mid->intr_mask);
+ tfr_status &= mid->intr_mask;
+ if (tfr_status) {
/*need to disable intr*/
- iowrite32((status << 8), mid->dma_base + MASK_TFR);
- pr_debug("MDMA: Calling tasklet %x\n", status);
+ iowrite32((tfr_status << INT_MASK_WE), mid->dma_base + MASK_TFR);
+ iowrite32((tfr_status << INT_MASK_WE), mid->dma_base + MASK_BLOCK);
+ pr_debug("MDMA: Calling tasklet %x\n", tfr_status);
call_tasklet = 1;
}
- status = ioread32(mid->dma_base + RAW_ERR);
- status &= mid->intr_mask;
- if (status) {
- iowrite32(MASK_INTR_REG(status), mid->dma_base + MASK_ERR);
+ err_status &= mid->intr_mask;
+ if (err_status) {
+ iowrite32(MASK_INTR_REG(err_status), mid->dma_base + MASK_ERR);
call_tasklet = 1;
}
if (call_tasklet)
@@ -856,7 +1067,6 @@ static int mid_setup_dma(struct pci_dev *pdev)
{
struct middma_device *dma = pci_get_drvdata(pdev);
int err, i;
- unsigned int irq_level;
/* DMA coherent memory pool for DMA descriptor allocations */
dma->dma_pool = pci_pool_create("intel_mid_dma_desc_pool", pdev,
@@ -884,6 +1094,7 @@ static int mid_setup_dma(struct pci_dev *pdev)
pr_debug("MDMA:Adding %d channel for this controller\n", dma->max_chan);
/*init CH structures*/
dma->intr_mask = 0;
+ dma->state = RUNNING;
for (i = 0; i < dma->max_chan; i++) {
struct intel_mid_dma_chan *midch = &dma->ch[i];
@@ -943,7 +1154,6 @@ static int mid_setup_dma(struct pci_dev *pdev)
/*register irq */
if (dma->pimr_mask) {
- irq_level = IRQF_SHARED;
pr_debug("MDMA:Requesting irq shared for DMAC1\n");
err = request_irq(pdev->irq, intel_mid_dma_interrupt1,
IRQF_SHARED, "INTEL_MID_DMAC1", dma);
@@ -951,10 +1161,9 @@ static int mid_setup_dma(struct pci_dev *pdev)
goto err_irq;
} else {
dma->intr_mask = 0x03;
- irq_level = 0;
pr_debug("MDMA:Requesting irq for DMAC2\n");
err = request_irq(pdev->irq, intel_mid_dma_interrupt2,
- 0, "INTEL_MID_DMAC2", dma);
+ IRQF_SHARED, "INTEL_MID_DMAC2", dma);
if (0 != err)
goto err_irq;
}
@@ -1070,6 +1279,9 @@ static int __devinit intel_mid_dma_probe(struct pci_dev *pdev,
if (err)
goto err_dma;
+ pm_runtime_set_active(&pdev->dev);
+ pm_runtime_enable(&pdev->dev);
+ pm_runtime_allow(&pdev->dev);
return 0;
err_dma:
@@ -1104,6 +1316,85 @@ static void __devexit intel_mid_dma_remove(struct pci_dev *pdev)
pci_disable_device(pdev);
}
+/* Power Management */
+/*
+* dma_suspend - PCI suspend function
+*
+* @pci: PCI device structure
+* @state: PM message
+*
+* This function is called by OS when a power event occurs
+*/
+int dma_suspend(struct pci_dev *pci, pm_message_t state)
+{
+ int i;
+ struct middma_device *device = pci_get_drvdata(pci);
+ pr_debug("MDMA: dma_suspend called\n");
+
+ for (i = 0; i < device->max_chan; i++) {
+ if (device->ch[i].in_use)
+ return -EAGAIN;
+ }
+ device->state = SUSPENDED;
+ pci_set_drvdata(pci, device);
+ pci_save_state(pci);
+ pci_disable_device(pci);
+ pci_set_power_state(pci, PCI_D3hot);
+ return 0;
+}
+
+/**
+* dma_resume - PCI resume function
+*
+* @pci: PCI device structure
+*
+* This function is called by OS when a power event occurs
+*/
+int dma_resume(struct pci_dev *pci)
+{
+ int ret;
+ struct middma_device *device = pci_get_drvdata(pci);
+
+ pr_debug("MDMA: dma_resume called\n");
+ pci_set_power_state(pci, PCI_D0);
+ pci_restore_state(pci);
+ ret = pci_enable_device(pci);
+ if (ret) {
+ pr_err("MDMA: device cant be enabled for %x\n", pci->device);
+ return ret;
+ }
+ device->state = RUNNING;
+ iowrite32(REG_BIT0, device->dma_base + DMA_CFG);
+ pci_set_drvdata(pci, device);
+ return 0;
+}
+
+static int dma_runtime_suspend(struct device *dev)
+{
+ struct pci_dev *pci_dev = to_pci_dev(dev);
+ return dma_suspend(pci_dev, PMSG_SUSPEND);
+}
+
+static int dma_runtime_resume(struct device *dev)
+{
+ struct pci_dev *pci_dev = to_pci_dev(dev);
+ return dma_resume(pci_dev);
+}
+
+static int dma_runtime_idle(struct device *dev)
+{
+ struct pci_dev *pdev = to_pci_dev(dev);
+ struct middma_device *device = pci_get_drvdata(pdev);
+ int i;
+
+ for (i = 0; i < device->max_chan; i++) {
+ if (device->ch[i].in_use)
+ return -EAGAIN;
+ }
+
+ return pm_schedule_suspend(dev, 0);
+}
+
/******************************************************************************
* PCI stuff
*/
@@ -1116,11 +1407,24 @@ static struct pci_device_id intel_mid_dma_ids[] = {
};
MODULE_DEVICE_TABLE(pci, intel_mid_dma_ids);
+static const struct dev_pm_ops intel_mid_dma_pm = {
+ .runtime_suspend = dma_runtime_suspend,
+ .runtime_resume = dma_runtime_resume,
+ .runtime_idle = dma_runtime_idle,
+};
+
static struct pci_driver intel_mid_dma_pci = {
.name = "Intel MID DMA",
.id_table = intel_mid_dma_ids,
.probe = intel_mid_dma_probe,
.remove = __devexit_p(intel_mid_dma_remove),
+#ifdef CONFIG_PM
+ .suspend = dma_suspend,
+ .resume = dma_resume,
+ .driver = {
+ .pm = &intel_mid_dma_pm,
+ },
+#endif
};
static int __init intel_mid_dma_init(void)
generated by cgit v1.2.3 (git 2.25.1) at 2024-04-26 02:29:44 +0000