mxs/dma: Enlarge the CCW descriptor area to 4 pages
In case of a large SPI flash, the amount of DMA descriptors
available to the DMA driver is not large enough anymore. For
example 8MB SPI flash now needs 129 descriptors to be transfered
in one long read. There are currently 53 descriptors available in
one PAGE_SIZE-big block. Enlarge the allocated descriptor area to
four PAGE_SIZE blocks to fulfill such requirements.
Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Dan Williams <djbw@fb.com>
Cc: Fabio Estevam <fabio.estevam@freescale.com>
Cc: Shawn Guo <shawn.guo@linaro.org>
Acked-by: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Vinod Koul <vinod.koul@linux.intel.com>
diff --git a/drivers/dma/mxs-dma.c b/drivers/dma/mxs-dma.c
index 7f41b25..e269325 100644
--- a/drivers/dma/mxs-dma.c
+++ b/drivers/dma/mxs-dma.c
@@ -101,7 +101,8 @@
u32 pio_words[MXS_PIO_WORDS];
};
-#define NUM_CCW (int)(PAGE_SIZE / sizeof(struct mxs_dma_ccw))
+#define CCW_BLOCK_SIZE (4 * PAGE_SIZE)
+#define NUM_CCW (int)(CCW_BLOCK_SIZE / sizeof(struct mxs_dma_ccw))
struct mxs_dma_chan {
struct mxs_dma_engine *mxs_dma;
@@ -354,14 +355,15 @@
mxs_chan->chan_irq = data->chan_irq;
- mxs_chan->ccw = dma_alloc_coherent(mxs_dma->dma_device.dev, PAGE_SIZE,
- &mxs_chan->ccw_phys, GFP_KERNEL);
+ mxs_chan->ccw = dma_alloc_coherent(mxs_dma->dma_device.dev,
+ CCW_BLOCK_SIZE, &mxs_chan->ccw_phys,
+ GFP_KERNEL);
if (!mxs_chan->ccw) {
ret = -ENOMEM;
goto err_alloc;
}
- memset(mxs_chan->ccw, 0, PAGE_SIZE);
+ memset(mxs_chan->ccw, 0, CCW_BLOCK_SIZE);
if (mxs_chan->chan_irq != NO_IRQ) {
ret = request_irq(mxs_chan->chan_irq, mxs_dma_int_handler,
@@ -387,7 +389,7 @@
err_clk:
free_irq(mxs_chan->chan_irq, mxs_dma);
err_irq:
- dma_free_coherent(mxs_dma->dma_device.dev, PAGE_SIZE,
+ dma_free_coherent(mxs_dma->dma_device.dev, CCW_BLOCK_SIZE,
mxs_chan->ccw, mxs_chan->ccw_phys);
err_alloc:
return ret;
@@ -402,7 +404,7 @@
free_irq(mxs_chan->chan_irq, mxs_dma);
- dma_free_coherent(mxs_dma->dma_device.dev, PAGE_SIZE,
+ dma_free_coherent(mxs_dma->dma_device.dev, CCW_BLOCK_SIZE,
mxs_chan->ccw, mxs_chan->ccw_phys);
clk_disable_unprepare(mxs_dma->clk);