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| author | Kyungmin Park <kyungmin.park@samsung.com> | 2010-09-28 19:27:10 +0900 |
|---|---|---|
| committer | David Woodhouse <David.Woodhouse@intel.com> | 2010-10-25 00:51:33 +0100 |
| commit | dcf08227e964a53a2cb39130b74842c7dcb6adde (patch) | |
| tree | 76afbe6cec8de927c0f120beaa0b32eb0675ce2d /drivers/mtd/onenand | |
| parent | aa6d1c0e15948894978b342da45d91f5a2af9933 (diff) | |
| download | kernel_samsung_smdk4412-dcf08227e964a53a2cb39130b74842c7dcb6adde.tar.gz kernel_samsung_smdk4412-dcf08227e964a53a2cb39130b74842c7dcb6adde.tar.bz2 kernel_samsung_smdk4412-dcf08227e964a53a2cb39130b74842c7dcb6adde.zip | |
mtd: OneNAND: S5PC110: Fix wrong DMA handling when HIGHMEM
When use HIGHMEM, dma_map_single doesn't get the proper DMA address.
So use the dma_map_page in this case.
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Diffstat (limited to 'drivers/mtd/onenand')
| -rw-r--r-- | drivers/mtd/onenand/samsung.c | 29 |
1 files changed, 18 insertions, 11 deletions
diff --git a/drivers/mtd/onenand/samsung.c b/drivers/mtd/onenand/samsung.c index 285085a93c3..afdb4c54413 100644 --- a/drivers/mtd/onenand/samsung.c +++ b/drivers/mtd/onenand/samsung.c @@ -582,7 +582,8 @@ static int s5pc110_read_bufferram(struct mtd_info *mtd, int area, void __iomem *p; void *buf = (void *) buffer; dma_addr_t dma_src, dma_dst; - int err; + int err, page_dma = 0; + struct device *dev = &onenand->pdev->dev; p = this->base + area; if (ONENAND_CURRENT_BUFFERRAM(this)) { @@ -606,21 +607,27 @@ static int s5pc110_read_bufferram(struct mtd_info *mtd, int area, page = vmalloc_to_page(buf); if (!page) goto normal; - buf = page_address(page) + ((size_t) buf & ~PAGE_MASK); - } - /* DMA routine */ - dma_src = onenand->phys_base + (p - this->base); - dma_dst = dma_map_single(&onenand->pdev->dev, - buf, count, DMA_FROM_DEVICE); - if (dma_mapping_error(&onenand->pdev->dev, dma_dst)) { - dev_err(&onenand->pdev->dev, - "Couldn't map a %d byte buffer for DMA\n", count); + page_dma = 1; + /* DMA routine */ + dma_src = onenand->phys_base + (p - this->base); + dma_dst = dma_map_page(dev, page, 0, count, DMA_FROM_DEVICE); + } else { + /* DMA routine */ + dma_src = onenand->phys_base + (p - this->base); + dma_dst = dma_map_single(dev, buf, count, DMA_FROM_DEVICE); + } + if (dma_mapping_error(dev, dma_dst)) { + dev_err(dev, "Couldn't map a %d byte buffer for DMA\n", count); goto normal; } err = s5pc110_dma_ops((void *) dma_dst, (void *) dma_src, count, S5PC110_DMA_DIR_READ); - dma_unmap_single(&onenand->pdev->dev, dma_dst, count, DMA_FROM_DEVICE); + + if (page_dma) + dma_unmap_page(dev, dma_dst, count, DMA_FROM_DEVICE); + else + dma_unmap_single(dev, dma_dst, count, DMA_FROM_DEVICE); if (!err) return 0; |