summaryrefslogtreecommitdiff
path: root/drivers/mtd/nand
diff options
context:
space:
mode:
authorCooper Jr., Franklin <fcooper@ti.com>2016-05-04 21:34:43 +0300
committerBoris Brezillon <boris.brezillon@free-electrons.com>2016-05-30 11:03:16 +0300
commitaa7abd312c11744f9718338a40ebaaf0685a768a (patch)
tree91adbfe350b8184ba79cc4fb09cddb1e01f920dc /drivers/mtd/nand
parent1a695a905c18548062509178b98bc91e67510864 (diff)
downloadlinux-aa7abd312c11744f9718338a40ebaaf0685a768a.tar.xz
mtd: nand: omap2: Support parsing dma channel information from DT
Switch from dma_request_channel to allow passing dma channel information from DT rather than hardcoding a value. Also provide a handle to the GPMC's dev so it can be used to parse the DMA channel information within the GPMC's DT node. Performance Numbers via mtd_speedtest now that EDMA based prefetch works: AM335x Performance numbers: DMA CPULOAD Write: 54% Read: 35% page write speed -23% (vs non dma) page read speed -35% (vs non dma) NO DMA (prefetch-polled) CPULOAD Write: 98% Read: 98% AM437x Performance numbers: DMA CPU LOAD Write: 56% Read: 36% page write speed -16% (vs non dma) page read speed -22% (vs non dma) NO DMA (prefetch-polled) CPULOAD Write: 93% Read: 93% Signed-off-by: Franklin S Cooper Jr <fcooper@ti.com> Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Diffstat (limited to 'drivers/mtd/nand')
-rw-r--r--drivers/mtd/nand/omap2.c7
1 files changed, 2 insertions, 5 deletions
diff --git a/drivers/mtd/nand/omap2.c b/drivers/mtd/nand/omap2.c
index 08e158895635..83b9091233d4 100644
--- a/drivers/mtd/nand/omap2.c
+++ b/drivers/mtd/nand/omap2.c
@@ -118,8 +118,6 @@
#define PREFETCH_STATUS_FIFO_CNT(val) ((val >> 24) & 0x7F)
#define STATUS_BUFF_EMPTY 0x00000001
-#define OMAP24XX_DMA_GPMC 4
-
#define SECTOR_BYTES 512
/* 4 bit padding to make byte aligned, 56 = 52 + 4 */
#define BCH4_BIT_PAD 4
@@ -1808,7 +1806,6 @@ static int omap_nand_probe(struct platform_device *pdev)
struct nand_chip *nand_chip;
int err;
dma_cap_mask_t mask;
- unsigned sig;
struct resource *res;
struct device *dev = &pdev->dev;
int min_oobbytes = BADBLOCK_MARKER_LENGTH;
@@ -1921,8 +1918,8 @@ static int omap_nand_probe(struct platform_device *pdev)
case NAND_OMAP_PREFETCH_DMA:
dma_cap_zero(mask);
dma_cap_set(DMA_SLAVE, mask);
- sig = OMAP24XX_DMA_GPMC;
- info->dma = dma_request_channel(mask, omap_dma_filter_fn, &sig);
+ info->dma = dma_request_chan(pdev->dev.parent, "rxtx");
+
if (!info->dma) {
dev_err(&pdev->dev, "DMA engine request failed\n");
err = -ENXIO;