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authorRussell King <rmk+kernel@arm.linux.org.uk>2012-04-13 12:27:37 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2012-07-31 12:06:22 +0100
commit26b88520b80695a6fa5fd95b5d97c03f4daf87e0 (patch)
tree6ac37cd764314fd7c0f84f401648f1a473b3edc3 /drivers/mmc
parentc5c98927d74cd6853579e1a5b56cd6eb0d4885f0 (diff)
downloadlinux-linaro-stable-26b88520b80695a6fa5fd95b5d97c03f4daf87e0.tar.gz
mmc: omap_hsmmc: remove private DMA API implementation
Remove the private DMA API implementation from omap_hsmmc, making it use entirely the DMA engine API. Tested-by: Tony Lindgren <tony@atomide.com> Tested-by: Venkatraman S <svenkatr@ti.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'drivers/mmc')
-rw-r--r--drivers/mmc/host/omap_hsmmc.c263
1 files changed, 63 insertions, 200 deletions
diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c
index effe328c1c14..2b2c98773f15 100644
--- a/drivers/mmc/host/omap_hsmmc.c
+++ b/drivers/mmc/host/omap_hsmmc.c
@@ -38,7 +38,6 @@
#include <linux/gpio.h>
#include <linux/regulator/consumer.h>
#include <linux/pm_runtime.h>
-#include <plat/dma.h>
#include <mach/hardware.h>
#include <plat/board.h>
#include <plat/mmc.h>
@@ -166,10 +165,9 @@ struct omap_hsmmc_host {
u32 bytesleft;
int suspended;
int irq;
- int use_dma, dma_ch, dma2;
+ int use_dma, dma_ch;
struct dma_chan *tx_chan;
struct dma_chan *rx_chan;
- int dma_line_tx, dma_line_rx;
int slot_id;
int response_busy;
int context_loss;
@@ -808,18 +806,17 @@ static struct dma_chan *omap_hsmmc_get_dma_chan(struct omap_hsmmc_host *host,
static void omap_hsmmc_request_done(struct omap_hsmmc_host *host, struct mmc_request *mrq)
{
- int dma_ch, dma2;
+ int dma_ch;
unsigned long flags;
spin_lock_irqsave(&host->irq_lock, flags);
host->req_in_progress = 0;
dma_ch = host->dma_ch;
- dma2 = host->dma2;
spin_unlock_irqrestore(&host->irq_lock, flags);
omap_hsmmc_disable_irq(host);
/* Do not complete the request if DMA is still in progress */
- if (mrq->data && host->use_dma && (dma_ch != -1 || dma2 != -1))
+ if (mrq->data && host->use_dma && dma_ch != -1)
return;
host->mrq = NULL;
mmc_request_done(host->mmc, mrq);
@@ -888,7 +885,7 @@ omap_hsmmc_cmd_done(struct omap_hsmmc_host *host, struct mmc_command *cmd)
*/
static void omap_hsmmc_dma_cleanup(struct omap_hsmmc_host *host, int errno)
{
- int dma_ch, dma2;
+ int dma_ch;
unsigned long flags;
host->data->error = errno;
@@ -896,11 +893,9 @@ static void omap_hsmmc_dma_cleanup(struct omap_hsmmc_host *host, int errno)
spin_lock_irqsave(&host->irq_lock, flags);
dma_ch = host->dma_ch;
host->dma_ch = -1;
- dma2 = host->dma2;
- host->dma2 = -1;
spin_unlock_irqrestore(&host->irq_lock, flags);
- if (host->use_dma && dma2 != -1) {
+ if (host->use_dma && dma_ch != -1) {
struct dma_chan *chan = omap_hsmmc_get_dma_chan(host, host->data);
dmaengine_terminate_all(chan);
@@ -910,13 +905,6 @@ static void omap_hsmmc_dma_cleanup(struct omap_hsmmc_host *host, int errno)
host->data->host_cookie = 0;
}
- if (host->use_dma && dma_ch != -1) {
- dma_unmap_sg(mmc_dev(host->mmc), host->data->sg,
- host->data->sg_len,
- omap_hsmmc_get_dma_dir(host, host->data));
- omap_free_dma(dma_ch);
- host->data->host_cookie = 0;
- }
host->data = NULL;
}
@@ -1212,100 +1200,6 @@ static irqreturn_t omap_hsmmc_detect(int irq, void *dev_id)
return IRQ_HANDLED;
}
-static int omap_hsmmc_get_dma_sync_dev(struct omap_hsmmc_host *host,
- struct mmc_data *data)
-{
- int sync_dev;
-
- if (data->flags & MMC_DATA_WRITE)
- sync_dev = host->dma_line_tx;
- else
- sync_dev = host->dma_line_rx;
- return sync_dev;
-}
-
-static void omap_hsmmc_config_dma_params(struct omap_hsmmc_host *host,
- struct mmc_data *data,
- struct scatterlist *sgl)
-{
- int blksz, nblk, dma_ch;
-
- dma_ch = host->dma_ch;
- if (data->flags & MMC_DATA_WRITE) {
- omap_set_dma_dest_params(dma_ch, 0, OMAP_DMA_AMODE_CONSTANT,
- (host->mapbase + OMAP_HSMMC_DATA), 0, 0);
- omap_set_dma_src_params(dma_ch, 0, OMAP_DMA_AMODE_POST_INC,
- sg_dma_address(sgl), 0, 0);
- } else {
- omap_set_dma_src_params(dma_ch, 0, OMAP_DMA_AMODE_CONSTANT,
- (host->mapbase + OMAP_HSMMC_DATA), 0, 0);
- omap_set_dma_dest_params(dma_ch, 0, OMAP_DMA_AMODE_POST_INC,
- sg_dma_address(sgl), 0, 0);
- }
-
- blksz = host->data->blksz;
- nblk = sg_dma_len(sgl) / blksz;
-
- omap_set_dma_transfer_params(dma_ch, OMAP_DMA_DATA_TYPE_S32,
- blksz / 4, nblk, OMAP_DMA_SYNC_FRAME,
- omap_hsmmc_get_dma_sync_dev(host, data),
- !(data->flags & MMC_DATA_WRITE));
-
- omap_start_dma(dma_ch);
-}
-
-/*
- * DMA call back function
- */
-static void omap_hsmmc_dma_cb(int lch, u16 ch_status, void *cb_data)
-{
- struct omap_hsmmc_host *host = cb_data;
- struct mmc_data *data;
- int dma_ch, req_in_progress;
- unsigned long flags;
-
- if (!(ch_status & OMAP_DMA_BLOCK_IRQ)) {
- dev_warn(mmc_dev(host->mmc), "unexpected dma status %x\n",
- ch_status);
- return;
- }
-
- spin_lock_irqsave(&host->irq_lock, flags);
- if (host->dma_ch < 0) {
- spin_unlock_irqrestore(&host->irq_lock, flags);
- return;
- }
-
- data = host->mrq->data;
- host->dma_sg_idx++;
- if (host->dma_sg_idx < host->dma_len) {
- /* Fire up the next transfer. */
- omap_hsmmc_config_dma_params(host, data,
- data->sg + host->dma_sg_idx);
- spin_unlock_irqrestore(&host->irq_lock, flags);
- return;
- }
-
- if (!data->host_cookie)
- dma_unmap_sg(mmc_dev(host->mmc), data->sg, data->sg_len,
- omap_hsmmc_get_dma_dir(host, data));
-
- req_in_progress = host->req_in_progress;
- dma_ch = host->dma_ch;
- host->dma_ch = -1;
- spin_unlock_irqrestore(&host->irq_lock, flags);
-
- omap_free_dma(dma_ch);
-
- /* If DMA has finished after TC, complete the request */
- if (!req_in_progress) {
- struct mmc_request *mrq = host->mrq;
-
- host->mrq = NULL;
- mmc_request_done(host->mmc, mrq);
- }
-}
-
static void omap_hsmmc_dma_callback(void *param)
{
struct omap_hsmmc_host *host = param;
@@ -1314,7 +1208,7 @@ static void omap_hsmmc_dma_callback(void *param)
int req_in_progress;
spin_lock_irq(&host->irq_lock);
- if (host->dma2 < 0) {
+ if (host->dma_ch < 0) {
spin_unlock_irq(&host->irq_lock);
return;
}
@@ -1327,7 +1221,7 @@ static void omap_hsmmc_dma_callback(void *param)
omap_hsmmc_get_dma_dir(host, data));
req_in_progress = host->req_in_progress;
- host->dma2 = -1;
+ host->dma_ch = -1;
spin_unlock_irq(&host->irq_lock);
/* If DMA has finished after TC, complete the request */
@@ -1342,7 +1236,7 @@ static void omap_hsmmc_dma_callback(void *param)
static int omap_hsmmc_pre_dma_transfer(struct omap_hsmmc_host *host,
struct mmc_data *data,
struct omap_hsmmc_next *next,
- struct device *dev)
+ struct dma_chan *chan)
{
int dma_len;
@@ -1357,7 +1251,7 @@ static int omap_hsmmc_pre_dma_transfer(struct omap_hsmmc_host *host,
/* Check if next job is already prepared */
if (next ||
(!next && data->host_cookie != host->next_data.cookie)) {
- dma_len = dma_map_sg(dev, data->sg, data->sg_len,
+ dma_len = dma_map_sg(chan->device->dev, data->sg, data->sg_len,
omap_hsmmc_get_dma_dir(host, data));
} else {
@@ -1384,7 +1278,9 @@ static int omap_hsmmc_pre_dma_transfer(struct omap_hsmmc_host *host,
static int omap_hsmmc_start_dma_transfer(struct omap_hsmmc_host *host,
struct mmc_request *req)
{
- int dma_ch = 0, ret = 0, i;
+ struct dma_slave_config cfg;
+ struct dma_async_tx_descriptor *tx;
+ int ret = 0, i;
struct mmc_data *data = req->data;
struct dma_chan *chan;
@@ -1402,66 +1298,43 @@ static int omap_hsmmc_start_dma_transfer(struct omap_hsmmc_host *host,
*/
return -EINVAL;
- BUG_ON(host->dma_ch != -1 || host->dma2 != -1);
+ BUG_ON(host->dma_ch != -1);
chan = omap_hsmmc_get_dma_chan(host, data);
- if (!chan) {
- ret = omap_request_dma(omap_hsmmc_get_dma_sync_dev(host, data),
- "MMC/SD", omap_hsmmc_dma_cb, host, &dma_ch);
- if (ret != 0) {
- dev_err(mmc_dev(host->mmc),
- "%s: omap_request_dma() failed with %d\n",
- mmc_hostname(host->mmc), ret);
- return ret;
- }
- ret = omap_hsmmc_pre_dma_transfer(host, data, NULL,
- mmc_dev(host->mmc));
- if (ret)
- return ret;
-
- host->dma_ch = dma_ch;
- host->dma_sg_idx = 0;
- omap_hsmmc_config_dma_params(host, data, data->sg);
- } else {
- struct dma_slave_config cfg;
- struct dma_async_tx_descriptor *tx;
+ cfg.src_addr = host->mapbase + OMAP_HSMMC_DATA;
+ cfg.dst_addr = host->mapbase + OMAP_HSMMC_DATA;
+ cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
+ cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
+ cfg.src_maxburst = data->blksz / 4;
+ cfg.dst_maxburst = data->blksz / 4;
- cfg.src_addr = host->mapbase + OMAP_HSMMC_DATA;
- cfg.dst_addr = host->mapbase + OMAP_HSMMC_DATA;
- cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
- cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
- cfg.src_maxburst = data->blksz / 4;
- cfg.dst_maxburst = data->blksz / 4;
-
- ret = dmaengine_slave_config(chan, &cfg);
- if (ret)
- return ret;
+ ret = dmaengine_slave_config(chan, &cfg);
+ if (ret)
+ return ret;
- ret = omap_hsmmc_pre_dma_transfer(host, data, NULL,
- chan->device->dev);
- if (ret)
- return ret;
+ ret = omap_hsmmc_pre_dma_transfer(host, data, NULL, chan);
+ if (ret)
+ return ret;
- tx = dmaengine_prep_slave_sg(chan, data->sg, data->sg_len,
- data->flags & MMC_DATA_WRITE ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM,
- DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
- if (!tx) {
- dev_err(mmc_dev(host->mmc), "prep_slave_sg() failed\n");
- /* FIXME: cleanup */
- return -1;
- }
+ tx = dmaengine_prep_slave_sg(chan, data->sg, data->sg_len,
+ data->flags & MMC_DATA_WRITE ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM,
+ DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
+ if (!tx) {
+ dev_err(mmc_dev(host->mmc), "prep_slave_sg() failed\n");
+ /* FIXME: cleanup */
+ return -1;
+ }
- tx->callback = omap_hsmmc_dma_callback;
- tx->callback_param = host;
+ tx->callback = omap_hsmmc_dma_callback;
+ tx->callback_param = host;
- /* Does not fail */
- dmaengine_submit(tx);
+ /* Does not fail */
+ dmaengine_submit(tx);
- host->dma2 = 1;
+ host->dma_ch = 1;
- dma_async_issue_pending(chan);
- }
+ dma_async_issue_pending(chan);
return 0;
}
@@ -1543,14 +1416,11 @@ static void omap_hsmmc_post_req(struct mmc_host *mmc, struct mmc_request *mrq,
struct omap_hsmmc_host *host = mmc_priv(mmc);
struct mmc_data *data = mrq->data;
- if (host->use_dma) {
+ if (host->use_dma && data->host_cookie) {
struct dma_chan *c = omap_hsmmc_get_dma_chan(host, data);
- struct device *dev = c ? c->device->dev : mmc_dev(mmc);
- if (data->host_cookie)
- dma_unmap_sg(dev,
- data->sg, data->sg_len,
- omap_hsmmc_get_dma_dir(host, data));
+ dma_unmap_sg(c->device->dev, data->sg, data->sg_len,
+ omap_hsmmc_get_dma_dir(host, data));
data->host_cookie = 0;
}
}
@@ -1567,10 +1437,9 @@ static void omap_hsmmc_pre_req(struct mmc_host *mmc, struct mmc_request *mrq,
if (host->use_dma) {
struct dma_chan *c = omap_hsmmc_get_dma_chan(host, mrq->data);
- struct device *dev = c ? c->device->dev : mmc_dev(mmc);
if (omap_hsmmc_pre_dma_transfer(host, mrq->data,
- &host->next_data, dev))
+ &host->next_data, c))
mrq->data->host_cookie = 0;
}
}
@@ -1584,7 +1453,7 @@ static void omap_hsmmc_request(struct mmc_host *mmc, struct mmc_request *req)
int err;
BUG_ON(host->req_in_progress);
- BUG_ON(host->dma_ch != -1 || host->dma2 != -1);
+ BUG_ON(host->dma_ch != -1);
if (host->protect_card) {
if (host->reqs_blocked < 3) {
/*
@@ -1897,6 +1766,8 @@ static inline struct omap_mmc_platform_data
}
#endif
+extern bool omap_dma_filter_fn(struct dma_chan *chan, void *param);
+
static int __devinit omap_hsmmc_probe(struct platform_device *pdev)
{
struct omap_mmc_platform_data *pdata = pdev->dev.platform_data;
@@ -1905,6 +1776,8 @@ static int __devinit omap_hsmmc_probe(struct platform_device *pdev)
struct resource *res;
int ret, irq;
const struct of_device_id *match;
+ dma_cap_mask_t mask;
+ unsigned tx_req, rx_req;
match = of_match_device(of_match_ptr(omap_mmc_of_match), &pdev->dev);
if (match) {
@@ -1949,9 +1822,7 @@ static int __devinit omap_hsmmc_probe(struct platform_device *pdev)
host->pdata = pdata;
host->dev = &pdev->dev;
host->use_dma = 1;
- host->dev->dma_mask = &pdata->dma_mask;
host->dma_ch = -1;
- host->dma2 = -1;
host->irq = irq;
host->slot_id = 0;
host->mapbase = res->start + pdata->reg_offset;
@@ -2039,36 +1910,28 @@ static int __devinit omap_hsmmc_probe(struct platform_device *pdev)
dev_err(mmc_dev(host->mmc), "cannot get DMA TX channel\n");
goto err_irq;
}
- host->dma_line_tx = res->start;
+ tx_req = res->start;
res = platform_get_resource_byname(pdev, IORESOURCE_DMA, "rx");
if (!res) {
dev_err(mmc_dev(host->mmc), "cannot get DMA RX channel\n");
goto err_irq;
}
- host->dma_line_rx = res->start;
+ rx_req = res->start;
- {
- dma_cap_mask_t mask;
- unsigned sig;
- extern bool omap_dma_filter_fn(struct dma_chan *chan, void *param);
-
- dma_cap_zero(mask);
- dma_cap_set(DMA_SLAVE, mask);
-#if 1
- sig = host->dma_line_rx;
- host->rx_chan = dma_request_channel(mask, omap_dma_filter_fn, &sig);
- if (!host->rx_chan) {
- dev_warn(mmc_dev(host->mmc), "unable to obtain RX DMA engine channel %u\n", sig);
- }
-#endif
-#if 1
- sig = host->dma_line_tx;
- host->tx_chan = dma_request_channel(mask, omap_dma_filter_fn, &sig);
- if (!host->tx_chan) {
- dev_warn(mmc_dev(host->mmc), "unable to obtain TX DMA engine channel %u\n", sig);
- }
-#endif
+ dma_cap_zero(mask);
+ dma_cap_set(DMA_SLAVE, mask);
+
+ host->rx_chan = dma_request_channel(mask, omap_dma_filter_fn, &rx_req);
+ if (!host->rx_chan) {
+ dev_err(mmc_dev(host->mmc), "unable to obtain RX DMA engine channel %u\n", rx_req);
+ goto err_irq;
+ }
+
+ host->tx_chan = dma_request_channel(mask, omap_dma_filter_fn, &tx_req);
+ if (!host->tx_chan) {
+ dev_err(mmc_dev(host->mmc), "unable to obtain TX DMA engine channel %u\n", tx_req);
+ goto err_irq;
}
/* Request IRQ for MMC operations */