From patchwork Tue May 26 10:24:14 2009 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Subject: [2/2] Blackfin NFC Driver: fix hang when using NAND on BF527-EZKITs From: Mike Frysinger X-Patchwork-Id: 27646 Message-Id: <1243333454-673-2-git-send-email-vapier@gentoo.org> To: linux-mtd@lists.infradead.org Cc: uclinux-dist-devel@blackfin.uclinux.org, Cliff Cai , Bryan Wu Date: Tue, 26 May 2009 06:24:14 -0400 From: Cliff Cai 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 Signed-off-by: Mike Frysinger Signed-off-by: Bryan Wu --- 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 2ab42d2..8506e7e 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);