[CFT 10/11] mtd: omap2: remove private DMA API implementation
Russell King
rmk+kernel at arm.linux.org.uk
Thu Jun 7 07:09:36 EDT 2012
Remove the private DMA API implementation from nand/omap2.c
making it use entirely the DMA engine API.
Signed-off-by: Russell King <rmk+kernel at arm.linux.org.uk>
---
drivers/mtd/nand/omap2.c | 136 +++++++++-------------------------------------
1 files changed, 26 insertions(+), 110 deletions(-)
diff --git a/drivers/mtd/nand/omap2.c b/drivers/mtd/nand/omap2.c
index 2912d6c..e9309b3 100644
--- a/drivers/mtd/nand/omap2.c
+++ b/drivers/mtd/nand/omap2.c
@@ -126,7 +126,6 @@ struct omap_nand_info {
unsigned long phys_base;
struct completion comp;
struct dma_chan *dma;
- int dma_ch;
int gpmc_irq;
enum {
OMAP_NAND_IO_READ = 0, /* read */
@@ -339,15 +338,9 @@ static void omap_write_buf_pref(struct mtd_info *mtd,
}
/*
- * omap_nand_dma_cb: callback on the completion of dma transfer
- * @lch: logical channel
- * @ch_satuts: channel status
+ * omap_nand_dma_callback: callback on the completion of dma transfer
* @data: pointer to completion data structure
*/
-static void omap_nand_dma_cb(int lch, u16 ch_status, void *data)
-{
- complete((struct completion *) data);
-}
static void omap_nand_dma_callback(void *data)
{
complete((struct completion *) data);
@@ -365,17 +358,13 @@ static inline int omap_nand_dma_transfer(struct mtd_info *mtd, void *addr,
{
struct omap_nand_info *info = container_of(mtd,
struct omap_nand_info, mtd);
+ struct dma_async_tx_descriptor *tx;
enum dma_data_direction dir = is_write ? DMA_TO_DEVICE :
DMA_FROM_DEVICE;
- dma_addr_t dma_addr;
- int ret;
+ struct scatterlist sg;
unsigned long tim, limit;
-
- /* The fifo depth is 64 bytes max.
- * But configure the FIFO-threahold to 32 to get a sync at each frame
- * and frame length is 32 bytes.
- */
- int buf_len = len >> 6;
+ unsigned n;
+ int ret;
if (addr >= high_memory) {
struct page *p1;
@@ -389,89 +378,33 @@ static inline int omap_nand_dma_transfer(struct mtd_info *mtd, void *addr,
addr = page_address(p1) + ((size_t)addr & ~PAGE_MASK);
}
- if (info->dma) {
- struct dma_async_tx_descriptor *tx;
- struct scatterlist sg;
- unsigned n;
-
- sg_init_one(&sg, addr, len);
- n = dma_map_sg(info->dma->device->dev, &sg, 1, dir);
- if (n == 0) {
- dev_err(&info->pdev->dev,
- "Couldn't DMA map a %d byte buffer\n", len);
- goto out_copy;
- }
-
- tx = dmaengine_prep_slave_sg(info->dma, &sg, n,
- is_write ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM,
- DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
- if (!tx) {
- dma_unmap_sg(info->dma->device->dev, &sg, 1, dir);
- goto out_copy;
- }
- tx->callback = omap_nand_dma_callback;
- tx->callback_param = &info->comp;
- dmaengine_submit(tx);
-
- /* configure and start prefetch transfer */
- ret = gpmc_prefetch_enable(info->gpmc_cs,
- PREFETCH_FIFOTHRESHOLD_MAX, 0x1, len, is_write);
- if (ret) {
- /* PFPW engine is busy, use cpu copy method */
- dma_unmap_sg(info->dma->device->dev, &sg, 1, dir);
- goto out_copy;
- }
-
- init_completion(&info->comp);
- dma_async_issue_pending(info->dma);
-
- /* setup and start DMA using dma_addr */
- wait_for_completion(&info->comp);
- tim = 0;
- limit = (loops_per_jiffy * msecs_to_jiffies(OMAP_NAND_TIMEOUT_MS));
- while (gpmc_read_status(GPMC_PREFETCH_COUNT) && (tim++ < limit))
- cpu_relax();
-
- /* disable and stop the PFPW engine */
- gpmc_prefetch_reset(info->gpmc_cs);
-
- dma_unmap_sg(info->dma->device->dev, &sg, 1, dir);
- return 0;
- }
-
- dma_addr = dma_map_single(&info->pdev->dev, addr, len, dir);
- if (dma_mapping_error(&info->pdev->dev, dma_addr)) {
+ sg_init_one(&sg, addr, len);
+ n = dma_map_sg(info->dma->device->dev, &sg, 1, dir);
+ if (n == 0) {
dev_err(&info->pdev->dev,
"Couldn't DMA map a %d byte buffer\n", len);
goto out_copy;
}
- if (is_write) {
- omap_set_dma_dest_params(info->dma_ch, 0, OMAP_DMA_AMODE_CONSTANT,
- info->phys_base, 0, 0);
- omap_set_dma_src_params(info->dma_ch, 0, OMAP_DMA_AMODE_POST_INC,
- dma_addr, 0, 0);
- omap_set_dma_transfer_params(info->dma_ch, OMAP_DMA_DATA_TYPE_S32,
- 0x10, buf_len, OMAP_DMA_SYNC_FRAME,
- OMAP24XX_DMA_GPMC, OMAP_DMA_DST_SYNC);
- } else {
- omap_set_dma_src_params(info->dma_ch, 0, OMAP_DMA_AMODE_CONSTANT,
- info->phys_base, 0, 0);
- omap_set_dma_dest_params(info->dma_ch, 0, OMAP_DMA_AMODE_POST_INC,
- dma_addr, 0, 0);
- omap_set_dma_transfer_params(info->dma_ch, OMAP_DMA_DATA_TYPE_S32,
- 0x10, buf_len, OMAP_DMA_SYNC_FRAME,
- OMAP24XX_DMA_GPMC, OMAP_DMA_SRC_SYNC);
- }
- /* configure and start prefetch transfer */
+ tx = dmaengine_prep_slave_sg(info->dma, &sg, n,
+ is_write ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM,
+ DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
+ if (!tx)
+ goto out_copy_unmap;
+
+ tx->callback = omap_nand_dma_callback;
+ tx->callback_param = &info->comp;
+ dmaengine_submit(tx);
+
+ /* configure and start prefetch transfer */
ret = gpmc_prefetch_enable(info->gpmc_cs,
- PREFETCH_FIFOTHRESHOLD_MAX, 0x1, len, is_write);
+ PREFETCH_FIFOTHRESHOLD_MAX, 0x1, len, is_write);
if (ret)
/* PFPW engine is busy, use cpu copy method */
goto out_copy_unmap;
init_completion(&info->comp);
- omap_start_dma(info->dma_ch);
+ dma_async_issue_pending(info->dma);
/* setup and start DMA using dma_addr */
wait_for_completion(&info->comp);
@@ -483,11 +416,11 @@ static inline int omap_nand_dma_transfer(struct mtd_info *mtd, void *addr,
/* disable and stop the PFPW engine */
gpmc_prefetch_reset(info->gpmc_cs);
- dma_unmap_single(&info->pdev->dev, dma_addr, len, dir);
+ dma_unmap_sg(info->dma->device->dev, &sg, 1, dir);
return 0;
out_copy_unmap:
- dma_unmap_single(&info->pdev->dev, dma_addr, len, dir);
+ dma_unmap_sg(info->dma->device->dev, &sg, 1, dir);
out_copy:
if (info->nand.options & NAND_BUSWIDTH_16)
is_write == 0 ? omap_read_buf16(mtd, (u_char *) addr, len)
@@ -1307,7 +1240,9 @@ static int __devinit omap_nand_probe(struct platform_device *pdev)
sig = OMAP24XX_DMA_GPMC;
info->dma = dma_request_channel(mask, omap_dma_filter_fn, &sig);
if (!info->dma) {
- dev_warn(&pdev->dev, "DMA engine request failed\n");
+ dev_err(&pdev->dev, "DMA engine request failed\n");
+ err = -ENXIO;
+ goto out_release_mem_region;
} else {
struct dma_slave_config cfg;
int rc;
@@ -1327,22 +1262,6 @@ static int __devinit omap_nand_probe(struct platform_device *pdev)
}
info->nand.read_buf = omap_read_buf_dma_pref;
info->nand.write_buf = omap_write_buf_dma_pref;
- break;
- }
- err = omap_request_dma(OMAP24XX_DMA_GPMC, "NAND",
- omap_nand_dma_cb, &info->comp, &info->dma_ch);
- if (err < 0) {
- info->dma_ch = -1;
- dev_err(&pdev->dev, "DMA request failed!\n");
- goto out_release_mem_region;
- } else {
- omap_set_dma_dest_burst_mode(info->dma_ch,
- OMAP_DMA_DATA_BURST_16);
- omap_set_dma_src_burst_mode(info->dma_ch,
- OMAP_DMA_DATA_BURST_16);
-
- info->nand.read_buf = omap_read_buf_dma_pref;
- info->nand.write_buf = omap_write_buf_dma_pref;
}
break;
@@ -1460,9 +1379,6 @@ static int omap_nand_remove(struct platform_device *pdev)
omap3_free_bch(&info->mtd);
platform_set_drvdata(pdev, NULL);
- if (info->dma_ch != -1)
- omap_free_dma(info->dma_ch);
-
if (info->dma)
dma_release_channel(info->dma);
--
1.7.4.4
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