[PATCH] cmd: mmc: Add mmc reg read command for reading card registers
Michael Nazzareno Trimarchi
michael at amarulasolutions.com
Sun Jun 21 09:10:28 CEST 2020
Hi
On Sat, Jun 20, 2020 at 2:35 PM Michael Nazzareno Trimarchi
<michael at amarulasolutions.com> wrote:
>
> Hi
>
> On Sat, Jun 20, 2020 at 2:30 PM Marek Vasut <marex at denx.de> wrote:
> >
> > 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 at denx.de>
> > ---
> > cmd/Kconfig | 8 +++++
> > cmd/mmc.c | 94 +++++++++++++++++++++++++++++++++++++++++++++++++++++
> > 2 files changed, 102 insertions(+)
> >
> > diff --git a/cmd/Kconfig b/cmd/Kconfig
> > index 192b3b262f..a0cf03c911 100644
> > --- a/cmd/Kconfig
> > +++ b/cmd/Kconfig
> > @@ -1104,6 +1104,14 @@ 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 y
> > + 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 1529a3e05d..55fbfe822e 100644
> > --- a/cmd/mmc.c
> > +++ b/cmd/mmc.c
> > @@ -912,6 +912,93 @@ static int do_mmc_bkops_enable(struct cmd_tbl *cmdtp, int flag,
> > }
> > #endif
> >
> > +#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;
> > + } else {
>
> else is not needed
>
> > + off = simple_strtoul(argv[3], NULL, 10);
> > + if (!strcmp(argv[2], "cid")) {
> > + if (off > 1)
> > + 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) {
>
> Can you factorize all the conditions?
> string, function
>
> Even use strcmp("extcsd", arg
Sorry for the last comment, I was a bit sleeping
Michael
>
> Michael
>
> > + 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 int do_mmc_boot_wp(struct cmd_tbl *cmdtp, int flag,
> > int argc, char * const argv[])
> > {
> > @@ -963,6 +1050,9 @@ static struct cmd_tbl cmd_mmc[] = {
> > #ifdef CONFIG_CMD_BKOPS_ENABLE
> > U_BOOT_CMD_MKENT(bkops-enable, 2, 0, do_mmc_bkops_enable, "", ""),
> > #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,
> > @@ -1037,6 +1127,10 @@ U_BOOT_CMD(
> > #ifdef CONFIG_CMD_BKOPS_ENABLE
> > "mmc bkops-enable <dev> - enable background operations handshake on device\n"
> > " WARNING: This is a write-once setting.\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"
> > #endif
> > );
> >
> > --
> > 2.27.0
> >
>
>
> --
> | Michael Nazzareno Trimarchi Amarula Solutions BV |
> | COO - Founder Cruquiuskade 47 |
> | +31(0)851119172 Amsterdam 1018 AM NL |
> | [`as] http://www.amarulasolutions.com |
--
| Michael Nazzareno Trimarchi Amarula Solutions BV |
| COO - Founder Cruquiuskade 47 |
| +31(0)851119172 Amsterdam 1018 AM NL |
| [`as] http://www.amarulasolutions.com |
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