cmd: mmc: Add mmc reg read command for reading card registers
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>
diff --git a/cmd/mmc.c b/cmd/mmc.c
index c6bd81c..96befb2 100644
--- a/cmd/mmc.c
+++ b/cmd/mmc.c
@@ -1110,6 +1110,93 @@
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 @@
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,
@@ -1230,6 +1320,12 @@
"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
);
/* Old command kept for compatibility. Same as 'mmc info' */