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MMC: add erase function to both mmc and sd

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Erase is a very basic function since the begin of sd specification is
announced. Although we could write a bulk of full 0xff memory to the
range to take place of erase, it is more convenient and safe to
implement the erase function itself.

Signed-off-by: Lei Wen <leiwen@marvell.com>
Signed-off-by: Andy Fleming <afleming@freescale.com>
Acked-by: Mike Frysinger <vapier@gentoo.org>
This commit is contained in:
Lei Wen
2011-06-22 17:03:31 +00:00
committed by Andy Fleming
parent 6be95ccf9f
commit e6f99a5611
4 changed files with 131 additions and 4 deletions
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22
common/cmd_mmc.c
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@@ -91,6 +91,7 @@ enum mmc_state {
MMC_INVALID,
MMC_READ,
MMC_WRITE,
MMC_ERASE,
};
static void print_mmcinfo(struct mmc *mmc)
{
@@ -252,15 +253,24 @@ int do_mmcops(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
state = MMC_READ;
else if (strcmp(argv[1], "write") == 0)
state = MMC_WRITE;
else if (strcmp(argv[1], "erase") == 0)
state = MMC_ERASE;
else
state = MMC_INVALID;
if (state != MMC_INVALID) {
struct mmc *mmc = find_mmc_device(curr_device);
void *addr = (void *)simple_strtoul(argv[2], NULL, 16);
u32 blk = simple_strtoul(argv[3], NULL, 16);
u32 cnt = simple_strtoul(argv[4], NULL, 16);
u32 n;
int idx = 2;
u32 blk, cnt, n;
void *addr;
if (state != MMC_ERASE) {
addr = (void *)simple_strtoul(argv[idx], NULL, 16);
++idx;
} else
addr = 0;
blk = simple_strtoul(argv[idx], NULL, 16);
cnt = simple_strtoul(argv[idx + 1], NULL, 16);
if (!mmc) {
printf("no mmc device at slot %x\n", curr_device);
@@ -283,6 +293,9 @@ int do_mmcops(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
n = mmc->block_dev.block_write(curr_device, blk,
cnt, addr);
break;
case MMC_ERASE:
n = mmc->block_dev.block_erase(curr_device, blk, cnt);
break;
default:
BUG();
}
@@ -300,6 +313,7 @@ U_BOOT_CMD(
"MMC sub system",
"read addr blk# cnt\n"
"mmc write addr blk# cnt\n"
"mmc erase blk# cnt\n"
"mmc rescan\n"
"mmc part - lists available partition on current mmc device\n"
"mmc dev [dev] [part] - show or set current mmc device [partition]\n"