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mmc: enable partition switch function for emmc

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For emmc, it may have up to 7 partitions: two boot partitions, one
user partition, one RPMB partition and four general purpose partitions.
(Refer to JESD84-A44.pdf/page 154)

As bootloader may need to read out or reflashing images on those

different partitions, it is better to enable the partition switch with
console command support.

Also for partition would be restore to user partition(part 0) when CMD0
is used, so change mmc_init routine to perform normal initialization
only once for each slot, unless use the rescan command to force init
again.

Signed-off-by: Lei Wen <leiwen@marvell.com>
Acked-by: Andy Fleming <afleming@freescale.com>
This commit is contained in:
Lei Wen
2011-05-02 16:26:26 +00:00
committed by Andy Fleming
parent ea6ebe2177
commit bc897b1d4d
3 changed files with 71 additions and 5 deletions
Download Patch File Download Diff File Expand all files Collapse all files

38
common/cmd_mmc.c
View File

@@ -164,6 +164,7 @@ int do_mmcops(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
return 1;
}
mmc->has_init = 0;
mmc_init(mmc);
return 0;
@@ -189,14 +190,22 @@ int do_mmcops(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
print_mmc_devices('\n');
return 0;
} else if (strcmp(argv[1], "dev") == 0) {
int dev;
int dev, part = -1;
struct mmc *mmc;
if (argc == 2)
dev = curr_device;
else if (argc == 3)
dev = simple_strtoul(argv[2], NULL, 10);
else
else if (argc == 4) {
dev = (int)simple_strtoul(argv[2], NULL, 10);
part = (int)simple_strtoul(argv[3], NULL, 10);
if (part > PART_ACCESS_MASK) {
printf("#part_num shouldn't be larger"
" than %d\n", PART_ACCESS_MASK);
return 1;
}
} else
return cmd_usage(cmdtp);
mmc = find_mmc_device(dev);
@@ -205,8 +214,29 @@ int do_mmcops(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
return 1;
}
mmc_init(mmc);
if (part != -1) {
int ret;
if (mmc->part_config == MMCPART_NOAVAILABLE) {
printf("Card doesn't support part_switch\n");
return 1;
}
if (part != mmc->part_num) {
ret = mmc_switch_part(dev, part);
if (!ret)
mmc->part_num = part;
printf("switch to partions #%d, %s\n",
part, (!ret) ? "OK" : "ERROR");
}
}
curr_device = dev;
printf("mmc%d is current device\n", curr_device);
if (mmc->part_config == MMCPART_NOAVAILABLE)
printf("mmc%d is current device\n", curr_device);
else
printf("mmc%d(part %d) is current device\n",
curr_device, mmc->part_num);
return 0;
} else if (strcmp(argv[1], "read") == 0) {
@@ -269,6 +299,6 @@ U_BOOT_CMD(
"mmc write addr blk# cnt\n"
"mmc rescan\n"
"mmc part - lists available partition on current mmc device\n"
"mmc dev [dev] - show or set current mmc device\n"
"mmc dev [dev] [part] - show or set current mmc device [partition]\n"
"mmc list - lists available devices");
#endif