diff options
Diffstat (limited to 'mmc_cmds.c')
-rw-r--r-- | mmc_cmds.c | 59 |
1 files changed, 59 insertions, 0 deletions
@@ -280,6 +280,65 @@ int do_write_boot_en(int nargs, char **argv) return ret; } +int do_hwreset(int value, int nargs, char **argv) +{ + __u8 ext_csd[512]; + int fd, ret; + char *device; + + CHECK(nargs != 2, "Usage: mmc hwreset enable </path/to/mmcblkX>\n", + exit(1)); + + device = argv[1]; + + fd = open(device, O_RDWR); + if (fd < 0) { + perror("open"); + exit(1); + } + + ret = read_extcsd(fd, ext_csd); + if (ret) { + fprintf(stderr, "Could not read EXT_CSD from %s\n", device); + exit(1); + } + + if ((ext_csd[EXT_CSD_RST_N_FUNCTION] & EXT_CSD_RST_N_EN_MASK) == + EXT_CSD_HW_RESET_EN) { + fprintf(stderr, + "H/W Reset is already permanently enabled on %s\n", + device); + exit(1); + } + if ((ext_csd[EXT_CSD_RST_N_FUNCTION] & EXT_CSD_RST_N_EN_MASK) == + EXT_CSD_HW_RESET_DIS) { + fprintf(stderr, + "H/W Reset is already permanently disabled on %s\n", + device); + exit(1); + } + + ret = write_extcsd_value(fd, EXT_CSD_RST_N_FUNCTION, value); + if (ret) { + fprintf(stderr, + "Could not write 0x%02x to EXT_CSD[%d] in %s\n", + value, EXT_CSD_RST_N_FUNCTION, device); + exit(1); + } + + return ret; +} + +int do_hwreset_en(int nargs, char **argv) +{ + return do_hwreset(EXT_CSD_HW_RESET_EN, nargs, argv); +} + +int do_hwreset_dis(int nargs, char **argv) +{ + return do_hwreset(EXT_CSD_HW_RESET_DIS, nargs, argv); +} + int do_write_bkops_en(int nargs, char **argv) { __u8 ext_csd[512], value = 0; |