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cmd: mmc: Add mmc reg read command for reading card registers

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Add extension to the 'mmc' command to read out the card registers.
Currently, only the eMMC OCR/CID/CSD/EXTCSD/RCA/DSR register are
supported. A register value can either be displayed or read into
an environment variable.

Tested-by: Jaehoon Chung <jh80.chung@samsung.com>
Reviewed-by: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Marek Vasut <marex@denx.de>
Reviewed-by: Fabio Estevam <festevam@gmail.com>
This commit is contained in:
Marek Vasut 2023-10-31 13:20:17 +01:00 committed by Jaehoon Chung
parent 21c84bb111
commit b5f403936d
3 changed files with 129 additions and 0 deletions
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7
cmd/Kconfig
View File

@ -1313,6 +1313,13 @@ config CMD_BKOPS_ENABLE
on a eMMC device. The feature is optionally available on eMMC devices
conforming to standard >= 4.41.
config CMD_MMC_REG
bool "Enable support for reading card registers in the mmc command"
depends on CMD_MMC
help
Enable the commands for reading card registers. This is useful
mostly for debugging or extracting details from the card.
config CMD_MMC_RPMB
bool "Enable support for RPMB in the mmc command"
depends on SUPPORT_EMMC_RPMB

96
cmd/mmc.c
View File

@ -1110,6 +1110,93 @@ static int do_mmc_boot_wp(struct cmd_tbl *cmdtp, int flag,
return CMD_RET_SUCCESS;
}
#if CONFIG_IS_ENABLED(CMD_MMC_REG)
static int do_mmc_reg(struct cmd_tbl *cmdtp, int flag,
int argc, char *const argv[])
{
ALLOC_CACHE_ALIGN_BUFFER(u8, ext_csd, MMC_MAX_BLOCK_LEN);
struct mmc *mmc;
int i, ret;
u32 off;
if (argc < 3 || argc > 5)
return CMD_RET_USAGE;
mmc = find_mmc_device(curr_device);
if (!mmc) {
printf("no mmc device at slot %x\n", curr_device);
return CMD_RET_FAILURE;
}
if (IS_SD(mmc)) {
printf("SD registers are not supported\n");
return CMD_RET_FAILURE;
}
off = simple_strtoul(argv[3], NULL, 10);
if (!strcmp(argv[2], "cid")) {
if (off > 3)
return CMD_RET_USAGE;
printf("CID[%i]: 0x%08x\n", off, mmc->cid[off]);
if (argv[4])
env_set_hex(argv[4], mmc->cid[off]);
return CMD_RET_SUCCESS;
}
if (!strcmp(argv[2], "csd")) {
if (off > 3)
return CMD_RET_USAGE;
printf("CSD[%i]: 0x%08x\n", off, mmc->csd[off]);
if (argv[4])
env_set_hex(argv[4], mmc->csd[off]);
return CMD_RET_SUCCESS;
}
if (!strcmp(argv[2], "dsr")) {
printf("DSR: 0x%08x\n", mmc->dsr);
if (argv[4])
env_set_hex(argv[4], mmc->dsr);
return CMD_RET_SUCCESS;
}
if (!strcmp(argv[2], "ocr")) {
printf("OCR: 0x%08x\n", mmc->ocr);
if (argv[4])
env_set_hex(argv[4], mmc->ocr);
return CMD_RET_SUCCESS;
}
if (!strcmp(argv[2], "rca")) {
printf("RCA: 0x%08x\n", mmc->rca);
if (argv[4])
env_set_hex(argv[4], mmc->rca);
return CMD_RET_SUCCESS;
}
if (!strcmp(argv[2], "extcsd") &&
mmc->version >= MMC_VERSION_4_41) {
ret = mmc_send_ext_csd(mmc, ext_csd);
if (ret)
return CMD_RET_FAILURE;
if (!strcmp(argv[3], "all")) {
/* Dump the entire register */
printf("EXT_CSD:");
for (i = 0; i < MMC_MAX_BLOCK_LEN; i++) {
if (!(i % 10))
printf("\n%03i: ", i);
printf(" %02x", ext_csd[i]);
}
printf("\n");
return CMD_RET_SUCCESS;
}
off = simple_strtoul(argv[3], NULL, 10);
if (off > 512)
return CMD_RET_USAGE;
printf("EXT_CSD[%i]: 0x%02x\n", off, ext_csd[off]);
if (argv[4])
env_set_hex(argv[4], ext_csd[off]);
return CMD_RET_SUCCESS;
}
return CMD_RET_FAILURE;
}
#endif
static struct cmd_tbl cmd_mmc[] = {
U_BOOT_CMD_MKENT(info, 1, 0, do_mmcinfo, "", ""),
U_BOOT_CMD_MKENT(read, 4, 1, do_mmc_read, "", ""),
@ -1142,6 +1229,9 @@ static struct cmd_tbl cmd_mmc[] = {
U_BOOT_CMD_MKENT(bkops-enable, 2, 0, do_mmc_bkops_enable, "", ""),
U_BOOT_CMD_MKENT(bkops, 4, 0, do_mmc_bkops, "", ""),
#endif
#if CONFIG_IS_ENABLED(CMD_MMC_REG)
U_BOOT_CMD_MKENT(reg, 5, 0, do_mmc_reg, "", ""),
#endif
};
static int do_mmcops(struct cmd_tbl *cmdtp, int flag, int argc,
@ -1229,6 +1319,12 @@ U_BOOT_CMD(
" WARNING: This is a write-once setting.\n"
"mmc bkops <dev> [auto|manual] [enable|disable]\n"
" - configure background operations handshake on device\n"
#endif
#if CONFIG_IS_ENABLED(CMD_MMC_REG)
"mmc reg read <reg> <offset> [env] - read card register <reg> offset <offset>\n"
" (optionally into [env] variable)\n"
" - reg: cid/csd/dsr/ocr/rca/extcsd\n"
" - offset: for cid/csd [0..3], for extcsd [0..511,all]\n"
#endif
);

26
doc/usage/cmd/mmc.rst
View File

@ -21,6 +21,7 @@ Synopsis
mmc bootpart-resize <dev> <dev part size MB> <RPMB part size MB>
mmc partconf <dev> [[varname] | [<boot_ack> <boot_partition> <partition_access>]]
mmc rst-function <dev> <value>
mmc reg read <reg> <offset> [env]
Description
-----------
@ -183,6 +184,31 @@ The 'mmc rst-function' command changes the RST_n_FUNCTION field.
0x3
Reserved
The 'mmc reg read <reg> <offset> [env]' reads eMMC card register and
either print it to standard output, or store the value in environment
variable.
<reg> with
optional offset <offset> into the register array, and print it to
standard output or store it into environment variable [env].
reg
cid
The Device IDentification (CID) register. Uses offset.
csd
The Device-Specific Data (CSD) register. Uses offset.
dsr
The driver stage register (DSR).
ocr
The operation conditions register (OCR).
rca
The relative Device address (RCA) register.
extcsd
The Extended CSD register. Uses offset.
offset
For 'cid'/'csd' 128 bit registers '[0..3]' in 32-bit increments. For 'extcsd' 512 bit register '[0..512,all]' in 8-bit increments, or 'all' to read the entire register.
env
Optional environment variable into which 32-bit value read from register should be stored.
Examples
--------