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authorMike Frysinger <vapier.adi@gmail.com>2009-03-04 12:01:29 -0800
committerDavid Woodhouse <David.Woodhouse@intel.com>2009-03-20 12:16:24 +0000
commit08d2503ecc2337275942c1f52822b7a464c0c0a3 (patch)
treef4a27a18a92ca62117cb1b6ba492888899796602 /drivers/mtd/nand
parent65c24491b4fef017c64e39ec64384fde5e05e0a0 (diff)
[MTD] [NAND] Blackfin NFC Driver: do not clobber DMAC1_PERIMUX
Only set DMAC1_PERIMUX once we have requested and been granted the dma channel to prevent breaking other peripherals in the error case Signed-off-by: Mike Frysinger <vapier.adi@gmail.com> Signed-off-by: Bryan Wu <cooloney@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Diffstat (limited to 'drivers/mtd/nand')
-rw-r--r--drivers/mtd/nand/bf5xx_nand.c14
1 files changed, 6 insertions, 8 deletions
diff --git a/drivers/mtd/nand/bf5xx_nand.c b/drivers/mtd/nand/bf5xx_nand.c
index 9af2a2cc115..5c6056e0242 100644
--- a/drivers/mtd/nand/bf5xx_nand.c
+++ b/drivers/mtd/nand/bf5xx_nand.c
@@ -552,7 +552,6 @@ static void bf5xx_nand_dma_write_buf(struct mtd_info *mtd,
static int bf5xx_nand_dma_init(struct bf5xx_nand_info *info)
{
int ret;
- unsigned short val;
/* Do not use dma */
if (!hardware_ecc)
@@ -560,13 +559,6 @@ static int bf5xx_nand_dma_init(struct bf5xx_nand_info *info)
init_completion(&info->dma_completion);
-#ifdef CONFIG_BF54x
- /* Setup DMAC1 channel mux for NFC which shared with SDH */
- val = bfin_read_DMAC1_PERIMUX();
- val &= 0xFFFE;
- bfin_write_DMAC1_PERIMUX(val);
- SSYNC();
-#endif
/* Request NFC DMA channel */
ret = request_dma(CH_NFC, "BF5XX NFC driver");
if (ret < 0) {
@@ -574,6 +566,12 @@ static int bf5xx_nand_dma_init(struct bf5xx_nand_info *info)
return ret;
}
+#ifdef CONFIG_BF54x
+ /* Setup DMAC1 channel mux for NFC which shared with SDH */
+ bfin_write_DMAC1_PERIMUX(bfin_read_DMAC1_PERIMUX() & ~1);
+ SSYNC();
+#endif
+
set_dma_callback(CH_NFC, (void *) bf5xx_nand_dma_irq, (void *) info);
/* Turn off the DMA channel first */