From 08d2503ecc2337275942c1f52822b7a464c0c0a3 Mon Sep 17 00:00:00 2001 From: Mike Frysinger Date: Wed, 4 Mar 2009 12:01:29 -0800 Subject: [PATCH] [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 Signed-off-by: Bryan Wu Signed-off-by: Andrew Morton Signed-off-by: David Woodhouse --- drivers/mtd/nand/bf5xx_nand.c | 14 ++++++-------- 1 file changed, 6 insertions(+), 8 deletions(-) diff --git a/drivers/mtd/nand/bf5xx_nand.c b/drivers/mtd/nand/bf5xx_nand.c index 9af2a2cc1153..5c6056e02426 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 */ -- 2.34.1