From eb6594689226663968ef0a9fd71ec5e1e4e04f9c Mon Sep 17 00:00:00 2001 From: David Vrabel Date: Wed, 8 Aug 2007 14:24:21 +0100 Subject: sdio: extend sdio_readsb() and friends to handle any length of buffer Extend sdio_readsb(), sdio_writesb(), sdio_memcpy_fromio(), and sdio_memcpy_toio() to handle any length of buffer by splitting the transfer into several IO_RW_EXTENDED commands. Typically, a transfer would be split into a single block mode transfer followed by a byte mode transfer for the remainder but we also handle lack of block mode support and the block size being greater than 512 (the maximum byte mode transfer size). host->max_seg_size <= host->max_req_size so there's no need to check both when determining the maximum data size for a single command. Signed-off-by: David Vrabel Signed-off-by: Pierre Ossman --- drivers/mmc/core/sdio_ops.c | 19 ++++++++++++------- 1 file changed, 12 insertions(+), 7 deletions(-) (limited to 'drivers/mmc/core/sdio_ops.c') diff --git a/drivers/mmc/core/sdio_ops.c b/drivers/mmc/core/sdio_ops.c index 4f2c7713947..98e20532452 100644 --- a/drivers/mmc/core/sdio_ops.c +++ b/drivers/mmc/core/sdio_ops.c @@ -88,7 +88,7 @@ int mmc_io_rw_direct(struct mmc_card *card, int write, unsigned fn, } int mmc_io_rw_extended(struct mmc_card *card, int write, unsigned fn, - unsigned addr, int bang, u8 *buf, unsigned size) + unsigned addr, int incr_addr, u8 *buf, unsigned blocks, unsigned blksz) { struct mmc_request mrq; struct mmc_command cmd; @@ -97,7 +97,9 @@ int mmc_io_rw_extended(struct mmc_card *card, int write, unsigned fn, BUG_ON(!card); BUG_ON(fn > 7); - BUG_ON(size > 512); + BUG_ON(blocks == 1 && blksz > 512); + WARN_ON(blocks == 0); + WARN_ON(blksz == 0); memset(&mrq, 0, sizeof(struct mmc_request)); memset(&cmd, 0, sizeof(struct mmc_command)); @@ -109,18 +111,21 @@ int mmc_io_rw_extended(struct mmc_card *card, int write, unsigned fn, cmd.opcode = SD_IO_RW_EXTENDED; cmd.arg = write ? 0x80000000 : 0x00000000; cmd.arg |= fn << 28; - cmd.arg |= bang ? 0x00000000 : 0x04000000; + cmd.arg |= incr_addr ? 0x04000000 : 0x00000000; cmd.arg |= addr << 9; - cmd.arg |= (size == 512) ? 0 : size; + if (blocks == 1 && blksz <= 512) + cmd.arg |= (blksz == 512) ? 0 : blksz; /* byte mode */ + else + cmd.arg |= 0x08000000 | blocks; /* block mode */ cmd.flags = MMC_RSP_R5 | MMC_CMD_ADTC; - data.blksz = size; - data.blocks = 1; + data.blksz = blksz; + data.blocks = blocks; data.flags = write ? MMC_DATA_WRITE : MMC_DATA_READ; data.sg = &sg; data.sg_len = 1; - sg_init_one(&sg, buf, size); + sg_init_one(&sg, buf, blksz * blocks); mmc_set_data_timeout(&data, card); -- cgit v1.2.3