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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>
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1 changed files with 11 additions and 2 deletions
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@ -496,11 +496,20 @@ static void bf5xx_nand_dma_rw(struct mtd_info *mtd,
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/* setup DMA register with Blackfin DMA API */
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set_dma_config(CH_NFC, 0x0);
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set_dma_start_addr(CH_NFC, (unsigned long) buf);
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/* The DMAs have different size on BF52x and BF54x */
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#ifdef CONFIG_BF52x
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set_dma_x_count(CH_NFC, (page_size >> 1));
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set_dma_x_modify(CH_NFC, 2);
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val = DI_EN | WDSIZE_16;
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#endif
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#ifdef CONFIG_BF54x
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set_dma_x_count(CH_NFC, (page_size >> 2));
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set_dma_x_modify(CH_NFC, 4);
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/* setup write or read operation */
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val = DI_EN | WDSIZE_32;
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#endif
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/* setup write or read operation */
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if (is_read)
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val |= WNR;
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set_dma_config(CH_NFC, val);
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