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Commit 2dd110b2 authored by Michael Weiser's avatar Michael Weiser Committed by Ulf Hansson
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mmc: sunxi-mmc: change idma descriptor to __le32 



The sunxi-mmc driver does not take into account the processor may be big
endian when writing the DMA descriptors. This causes cards not to be
detected when running a big-endian kernel. Change the descriptors for
IDMA to use __le32 and ensure they are suitably swapped before writing.
Tested successfully on the Cubieboard2.

Signed-off-by: default avatarMichael Weiser <michael.weiser@gmx.de>
Acked-by: default avatarMaxime Ripard <maxime.ripard@free-electrons.com>
Cc: Ulf Hansson <ulf.hansson@linaro.org>
Cc: Chen-Yu Tsai <wens@csie.org>
Cc: linux-mmc@vger.kernel.org
Signed-off-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
parent 63311bec

drivers/mmc/host/sunxi-mmc.c

+15 −12
Original line number Diff line number Diff line
@@ -223,10 +223,10 @@ struct sunxi_mmc_clk_delay { 
};



struct sunxi_idma_des {

	u32	config;

	u32	buf_size;

	u32	buf_addr_ptr1;

	u32	buf_addr_ptr2;

	__le32 config;

	__le32 buf_size;

	__le32 buf_addr_ptr1;

	__le32 buf_addr_ptr2;

};



struct sunxi_mmc_cfg {
@@ -329,22 +329,25 @@ static void sunxi_mmc_init_idma_des(struct sunxi_mmc_host *host, 
	int i, max_len = (1 << host->cfg->idma_des_size_bits);



	for (i = 0; i < data->sg_len; i++) {

		pdes[i].config = SDXC_IDMAC_DES0_CH | SDXC_IDMAC_DES0_OWN |

				 SDXC_IDMAC_DES0_DIC;

		pdes[i].config = cpu_to_le32(SDXC_IDMAC_DES0_CH |

					     SDXC_IDMAC_DES0_OWN |

					     SDXC_IDMAC_DES0_DIC);



		if (data->sg[i].length == max_len)

			pdes[i].buf_size = 0; /* 0 == max_len */

		else

			pdes[i].buf_size = data->sg[i].length;

			pdes[i].buf_size = cpu_to_le32(data->sg[i].length);



		next_desc += sizeof(struct sunxi_idma_des);

		pdes[i].buf_addr_ptr1 = sg_dma_address(&data->sg[i]);

		pdes[i].buf_addr_ptr2 = (u32)next_desc;

		pdes[i].buf_addr_ptr1 =

			cpu_to_le32(sg_dma_address(&data->sg[i]));

		pdes[i].buf_addr_ptr2 = cpu_to_le32((u32)next_desc);

	}



	pdes[0].config |= SDXC_IDMAC_DES0_FD;

	pdes[i - 1].config |= SDXC_IDMAC_DES0_LD | SDXC_IDMAC_DES0_ER;

	pdes[i - 1].config &= ~SDXC_IDMAC_DES0_DIC;

	pdes[0].config |= cpu_to_le32(SDXC_IDMAC_DES0_FD);

	pdes[i - 1].config |= cpu_to_le32(SDXC_IDMAC_DES0_LD |

					  SDXC_IDMAC_DES0_ER);

	pdes[i - 1].config &= cpu_to_le32(~SDXC_IDMAC_DES0_DIC);

	pdes[i - 1].buf_addr_ptr2 = 0;



	/*