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| author | Cliff Cai <cliff.cai@analog.com> | 2009-05-26 06:24:14 -0400 |
|---|---|---|
| committer | David Woodhouse <David.Woodhouse@intel.com> | 2009-06-05 18:27:43 +0100 |
| commit | c3a9f35673290f49ec115d36ad283961c82c135a (patch) | |
| tree | 07b08133e0bf0b53dff1c61b107e30bc911e5881 /drivers/mtd/nand/bf5xx_nand.c | |
| parent | 530c3b60658687e2ad7bf98ef83631a8280ae8a6 (diff) | |
| download | talos-obmc-linux-c3a9f35673290f49ec115d36ad283961c82c135a.tar.gz talos-obmc-linux-c3a9f35673290f49ec115d36ad283961c82c135a.zip | |
mtd: blackfin NFC: fix hang when using NAND on BF527-EZKITs
The DMAs have different bit sizes on BF52x and BF54x. From the PHRM:
"The 16-bit DMA Access Bus (DAB) connects the DMA controller to the
on-chip peripherals, PPI, SPI, Ethernet MAC, the SPORTs, NFC,
HOSTDP and the UARTs."
32-bit DMA won't work for BF52x.
Signed-off-by: Cliff Cai <cliff.cai@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Bryan Wu <cooloney@kernel.org>
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Diffstat (limited to 'drivers/mtd/nand/bf5xx_nand.c')
| -rw-r--r-- | drivers/mtd/nand/bf5xx_nand.c | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/drivers/mtd/nand/bf5xx_nand.c b/drivers/mtd/nand/bf5xx_nand.c index 2ab42d2d4f91..8506e7e606fd 100644 --- a/drivers/mtd/nand/bf5xx_nand.c +++ b/drivers/mtd/nand/bf5xx_nand.c @@ -496,11 +496,20 @@ static void bf5xx_nand_dma_rw(struct mtd_info *mtd, /* setup DMA register with Blackfin DMA API */ set_dma_config(CH_NFC, 0x0); set_dma_start_addr(CH_NFC, (unsigned long) buf); + +/* The DMAs have different size on BF52x and BF54x */ +#ifdef CONFIG_BF52x + set_dma_x_count(CH_NFC, (page_size >> 1)); + set_dma_x_modify(CH_NFC, 2); + val = DI_EN | WDSIZE_16; +#endif + +#ifdef CONFIG_BF54x set_dma_x_count(CH_NFC, (page_size >> 2)); set_dma_x_modify(CH_NFC, 4); - - /* setup write or read operation */ val = DI_EN | WDSIZE_32; +#endif + /* setup write or read operation */ if (is_read) val |= WNR; set_dma_config(CH_NFC, val); |
