[PATCH v5 10/16] mtd: onenand: omap2: Convert to use dmaengine for memcpy

Ladislav Michl
2017-11-15T16:33:33Z

From: Peter Ujfalusi <peter.ujfalusi@ti.com>

Do not use the legacy and deprecated omap-dma interface for setting up the
memcpy.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Ladislav Michl <ladis@linux-mips.org>
Reviewed-by: Sebastian Reichel <sebastian.reichel@collabora.co.uk>
Acked-by: Roger Quadros <rogerq@ti.com>
Tested-by: Tony Lindgren <tony@atomide.com>
---

Changes in v5: None
Changes in v4:
- new patch

Changes in v3: None
Changes in v2: None

drivers/mtd/onenand/omap2.c | 80 +++++++++++++++++++++------------------------
1 file changed, 38 insertions(+), 42 deletions(-)

diff --git a/drivers/mtd/onenand/omap2.c b/drivers/mtd/onenand/omap2.c
index 36314124488d..c9ff67100ef4 100644
--- a/drivers/mtd/onenand/omap2.c
+++ b/drivers/mtd/onenand/omap2.c
@@ -32,6 +32,7 @@
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/dma-mapping.h>
+#include <linux/dmaengine.h>
#include <linux/io.h>
#include <linux/slab.h>
#include <linux/gpio.h>
@@ -39,8 +40,6 @@
#include <asm/mach/flash.h>
#include <linux/platform_data/mtd-onenand-omap2.h>

-#include <linux/omap-dma.h>
-
#define DRIVER_NAME "omap2-onenand"

#define ONENAND_BUFRAM_SIZE (1024 * 5)
@@ -55,17 +54,15 @@ struct omap2_onenand {
struct onenand_chip onenand;
struct completion irq_done;
struct completion dma_done;
- int dma_channel;
+ struct dma_chan *dma_chan;
int freq;
int (*setup)(void __iomem *base, int *freq_ptr);
u8 flags;
};

-static void omap2_onenand_dma_cb(int lch, u16 ch_status, void *data)
+static void omap2_onenand_dma_complete_func(void *completion)
{
- struct omap2_onenand *c = data;
-
- complete(&c->dma_done);
+ complete(completion);
}

static irqreturn_t omap2_onenand_interrupt(int irq, void *dev_id)
@@ -292,23 +289,31 @@ static inline int omap2_onenand_dma_transfer(struct omap2_onenand *c,
dma_addr_t src, dma_addr_t dst,
size_t count)
{
- int data_type = __ffs((src | dst | count));
+ struct dma_async_tx_descriptor *tx;
+ dma_cookie_t cookie;

- if (data_type > OMAP_DMA_DATA_TYPE_S32)
- data_type = OMAP_DMA_DATA_TYPE_S32;
-
- omap_set_dma_transfer_params(c->dma_channel, data_type,
- count / BIT(data_type), 1, 0, 0, 0);
- omap_set_dma_src_params(c->dma_channel, 0, OMAP_DMA_AMODE_POST_INC,
- src, 0, 0);
- omap_set_dma_dest_params(c->dma_channel, 0, OMAP_DMA_AMODE_POST_INC,
- dst, 0, 0);
+ tx = dmaengine_prep_dma_memcpy(c->dma_chan, dst, src, count, 0);
+ if (!tx) {
+ dev_err(&c->pdev->dev, "Failed to prepare DMA memcpy\n");
+ return -EIO;
+ }

reinit_completion(&c->dma_done);
- omap_start_dma(c->dma_channel);
+
+ tx->callback = omap2_onenand_dma_complete_func;
+ tx->callback_param = &c->dma_done;
+
+ cookie = tx->tx_submit(tx);
+ if (dma_submit_error(cookie)) {
+ dev_err(&c->pdev->dev, "Failed to do DMA tx_submit\n");
+ return -EIO;
+ }
+
+ dma_async_issue_pending(c->dma_chan);
+
if (!wait_for_completion_io_timeout(&c->dma_done,
msecs_to_jiffies(20))) {
- omap_stop_dma(c->dma_channel);
+ dmaengine_terminate_sync(c->dma_chan);
return -ETIMEDOUT;
}

@@ -468,8 +473,7 @@ static int omap2_onenand_probe(struct platform_device *pdev)
c->flags = pdata->flags;
c->gpmc_cs = pdata->cs;
c->gpio_irq = pdata->gpio_irq;
- c->dma_channel = pdata->dma_channel;
- if (c->dma_channel < 0) {
+ if (pdata->dma_channel < 0) {
/* if -1, don't use DMA */
c->gpio_irq = 0;
}
@@ -521,25 +525,17 @@ static int omap2_onenand_probe(struct platform_device *pdev)
goto err_release_gpio;
}

- if (c->dma_channel >= 0) {
- r = omap_request_dma(0, pdev->dev.driver->name,
- omap2_onenand_dma_cb, (void *) c,
- &c->dma_channel);
- if (r == 0) {
- omap_set_dma_write_mode(c->dma_channel,
- OMAP_DMA_WRITE_NON_POSTED);
- omap_set_dma_src_data_pack(c->dma_channel, 1);
- omap_set_dma_src_burst_mode(c->dma_channel,
- OMAP_DMA_DATA_BURST_8);
- omap_set_dma_dest_data_pack(c->dma_channel, 1);
- omap_set_dma_dest_burst_mode(c->dma_channel,
- OMAP_DMA_DATA_BURST_8);
- } else {
+ if (pdata->dma_channel >= 0) {
+ dma_cap_mask_t mask;
+
+ dma_cap_zero(mask);
+ dma_cap_set(DMA_MEMCPY, mask);
+
+ c->dma_chan = dma_request_channel(mask, NULL, NULL);
+ if (!c->dma_chan)
dev_info(&pdev->dev,
"failed to allocate DMA for OneNAND, "
"using PIO instead\n");
- c->dma_channel = -1;
- }
}

dev_info(&pdev->dev, "initializing on CS%d, phys base 0x%08lx, virtual "
@@ -553,7 +549,7 @@ static int omap2_onenand_probe(struct platform_device *pdev)
mtd_set_of_node(&c->mtd, pdata->of_node);

this = &c->onenand;
- if (c->dma_channel >= 0) {
+ if (c->dma_chan) {
this->wait = omap2_onenand_wait;
this->read_bufferram = omap2_onenand_read_bufferram;
this->write_bufferram = omap2_onenand_write_bufferram;
@@ -573,8 +569,8 @@ static int omap2_onenand_probe(struct platform_device *pdev)
err_release_onenand:
onenand_release(&c->mtd);
err_release_dma:
- if (c->dma_channel != -1)
- omap_free_dma(c->dma_channel);
+ if (c->dma_chan)
+ dma_release_channel(c->dma_chan);
if (c->gpio_irq)
free_irq(gpio_to_irq(c->gpio_irq), c);
err_release_gpio:
@@ -595,8 +591,8 @@ static int omap2_onenand_remove(struct platform_device *pdev)
struct omap2_onenand *c = dev_get_drvdata(&pdev->dev);

onenand_release(&c->mtd);
- if (c->dma_channel != -1)
- omap_free_dma(c->dma_channel);
+ if (c->dma_chan)
+ dma_release_channel(c->dma_chan);
omap2_onenand_shutdown(pdev);
if (c->gpio_irq) {
free_irq(gpio_to_irq(c->gpio_irq), c);