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mmc: seperate block number into small parts for multi-write cmd 

Constraint the mmc framework to only send no more than 65535
blocks in one go during the multi-write command. This constraint
comes due to the limitation of 16bit width block counter register
at some hardware.

Signed-off-by: Lei Wen <leiwen@marvell.com>
Cc: Reinhard Meyer <u-boot@emk-elektronik.de>
This commit is contained in:
Lei Wen 2010-10-14 13:38:11 +08:00 committed by Wolfgang Denk
parent 73bb4c7240
commit 0158126e25
1 changed files with 39 additions and 15 deletions
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54
drivers/mmc/mmc.c
View File

@ -78,17 +78,11 @@ struct mmc *find_mmc_device(int dev_num)
}
static ulong
mmc_bwrite(int dev_num, ulong start, lbaint_t blkcnt, const void*src)
mmc_write_blocks(struct mmc *mmc, ulong start, lbaint_t blkcnt, const void*src)
{
struct mmc_cmd cmd;
struct mmc_data data;
int err;
int stoperr = 0;
struct mmc *mmc = find_mmc_device(dev_num);
int blklen;
if (!mmc)
return -1;
int blklen, err;
blklen = mmc->write_bl_len;
@ -97,12 +91,6 @@ mmc_bwrite(int dev_num, ulong start, lbaint_t blkcnt, const void*src)
start + blkcnt, mmc->block_dev.lba);
return 0;
}
err = mmc_set_blocklen(mmc, mmc->write_bl_len);
if (err) {
printf("set write bl len failed\n\r");
return err;
}
if (blkcnt > 1)
cmd.cmdidx = MMC_CMD_WRITE_MULTIPLE_BLOCK;
@ -134,12 +122,48 @@ mmc_bwrite(int dev_num, ulong start, lbaint_t blkcnt, const void*src)
cmd.cmdarg = 0;
cmd.resp_type = MMC_RSP_R1b;
cmd.flags = 0;
stoperr = mmc_send_cmd(mmc, &cmd, NULL);
err = mmc_send_cmd(mmc, &cmd, NULL);
if (err) {
printf("mmc fail to send stop cmd\n\r");
return err;
}
}
return blkcnt;
}
static ulong
mmc_bwrite(int dev_num, ulong start, lbaint_t blkcnt, const void*src)
{
int err;
struct mmc *mmc = find_mmc_device(dev_num);
lbaint_t cur, blocks_todo = blkcnt;
if (!mmc)
return -1;
err = mmc_set_blocklen(mmc, mmc->write_bl_len);
if (err) {
printf("set write bl len failed\n\r");
return err;
}
do {
/*
* The 65535 constraint comes from some hardware has
* only 16 bit width block number counter
*/
cur = (blocks_todo > 65535) ? 65535 : blocks_todo;
if(mmc_write_blocks(mmc, start, cur, src) != cur)
return -1;
blocks_todo -= cur;
start += cur;
src += cur * mmc->write_bl_len;
} while (blocks_todo > 0);
return blkcnt;
}
int mmc_read_block(struct mmc *mmc, void *dst, uint blocknum)
{
struct mmc_cmd cmd;