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.

Signed-off-by: Marek Vasut marex@denx.de --- Cc: Abdellatif El Khlifi abdellatif.elkhlifi@arm.com Cc: Heinrich Schuchardt xypron.glpk@gmx.de Cc: Ilias Apalodimas ilias.apalodimas@linaro.org Cc: Jaehoon Chung jh80.chung@samsung.com Cc: Ramon Fried rfried.dev@gmail.com Cc: Roger Knecht rknecht@pm.me Cc: Sean Edmond seanedmond@microsoft.com Cc: Simon Glass sjg@chromium.org Cc: Tobias Waldekranz tobias@waldekranz.com --- cmd/Kconfig | 8 +++++ cmd/mmc.c | 96 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 104 insertions(+)

diff --git a/cmd/Kconfig b/cmd/Kconfig index 6470b138d2f..dcd99757a1e 100644 --- a/cmd/Kconfig +++ b/cmd/Kconfig @@ -1307,6 +1307,14 @@ 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 + default n + 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 diff --git a/cmd/mmc.c b/cmd/mmc.c index c6bd81cebbc..c29f44b7a18 100644 --- a/cmd/mmc.c +++ b/cmd/mmc.c @@ -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 ret; + 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 );