In drivers/mmc/mmc.c, mmc_bread will do aligned read. So we don't need to use single block read. We can use multiblock read to improve the performance.
Signed-off-by: Terry Lv r65388@freescale.com --- drivers/mmc/mmc.c | 51 ++++++++++++++++++++++++++++++++++++++++----------- 1 files changed, 40 insertions(+), 11 deletions(-)
diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c index b69ce15..53ca3a1 100644 --- a/drivers/mmc/mmc.c +++ b/drivers/mmc/mmc.c @@ -205,27 +205,56 @@ free_buffer:
static ulong mmc_bread(int dev_num, ulong start, lbaint_t blkcnt, void *dst) { + struct mmc_cmd cmd; + struct mmc_data data; int err; - int i; + int stoperr = 0; struct mmc *mmc = find_mmc_device(dev_num); + int blklen;
if (!mmc) - return 0; + return -1;
- /* We always do full block reads from the card */ - err = mmc_set_blocklen(mmc, mmc->read_bl_len); + blklen = mmc->read_bl_len; + + err = mmc_set_blocklen(mmc, blklen);
if (err) { - return 0; + printf("set read bl len failed\n\r"); + return err; }
- for (i = start; i < start + blkcnt; i++, dst += mmc->read_bl_len) { - err = mmc_read_block(mmc, dst, i); + if (blkcnt > 1) + cmd.cmdidx = MMC_CMD_READ_MULTIPLE_BLOCK; + else + cmd.cmdidx = MMC_CMD_READ_SINGLE_BLOCK;
- if (err) { - printf("block read failed: %d\n", err); - return i - start; - } + if (mmc->high_capacity) + cmd.cmdarg = start; + else + cmd.cmdarg = start * blklen; + + cmd.resp_type = MMC_RSP_R1; + cmd.flags = 0; + + data.dest = dst; + data.blocks = blkcnt; + data.blocksize = blklen; + data.flags = MMC_DATA_READ; + + err = mmc_send_cmd(mmc, &cmd, &data); + + if (err) { + printf("mmc read failed\n\r"); + return err; + } + + if (blkcnt > 1) { + cmd.cmdidx = MMC_CMD_STOP_TRANSMISSION; + cmd.cmdarg = 0; + cmd.resp_type = MMC_RSP_R1b; + cmd.flags = 0; + stoperr = mmc_send_cmd(mmc, &cmd, NULL); }
return blkcnt;