diff options
Diffstat (limited to 'mmc_cmds.c')
| -rw-r--r-- | mmc_cmds.c | 67 |
1 files changed, 64 insertions, 3 deletions
@@ -98,7 +98,7 @@ int send_status(int fd, __u32 *response) void print_writeprotect_status(__u8 *ext_csd) { __u8 reg; - __u8 ext_csd_rev = ext_csd[192]; + __u8 ext_csd_rev = ext_csd[EXT_CSD_REV]; /* A43: reserved [174:0] */ if (ext_csd_rev >= 5) { @@ -1014,7 +1014,7 @@ int do_read_extcsd(int nargs, char **argv) exit(1); } - ext_csd_rev = ext_csd[192]; + ext_csd_rev = ext_csd[EXT_CSD_REV]; switch (ext_csd_rev) { case 7: @@ -1218,7 +1218,7 @@ int do_read_extcsd(int nargs, char **argv) if (reg & 0x01) printf(" HS eMMC @26MHz - at rated device voltage(s)\n"); printf("CSD structure version [CSD_STRUCTURE: 0x%02x]\n", ext_csd[194]); - /* ext_csd_rev = ext_csd[192] (already done!!!) */ + /* ext_csd_rev = ext_csd[EXT_CSD_REV] (already done!!!) */ printf("Command set [CMD_SET: 0x%02x]\n", ext_csd[191]); printf("Command set revision [CMD_SET_REV: 0x%02x]\n", ext_csd[189]); printf("Power class [POWER_CLASS: 0x%02x]\n", ext_csd[187]); @@ -1971,3 +1971,64 @@ int do_rpmb_write_block(int nargs, char **argv) return ret; } + +int do_cache_ctrl(int value, int nargs, char **argv) +{ + __u8 ext_csd[512]; + int fd, ret; + char *device; + + CHECK(nargs != 2, "Usage: mmc cache 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_REV] < EXT_CSD_REV_V4_5) { + fprintf(stderr, + "The CACHE option is only availabe on devices >= " + "MMC 4.5 %s\n", device); + exit(1); + } + + /* If the cache size is zero, this device does not have a cache */ + if (!(ext_csd[EXT_CSD_CACHE_SIZE_3] || + ext_csd[EXT_CSD_CACHE_SIZE_2] || + ext_csd[EXT_CSD_CACHE_SIZE_1] || + ext_csd[EXT_CSD_CACHE_SIZE_0])) { + fprintf(stderr, + "The CACHE option is not available on %s\n", + device); + exit(1); + } + ret = write_extcsd_value(fd, EXT_CSD_CACHE_CTRL, value); + if (ret) { + fprintf(stderr, + "Could not write 0x%02x to EXT_CSD[%d] in %s\n", + value, EXT_CSD_CACHE_CTRL, device); + exit(1); + } + + return ret; +} + +int do_cache_en(int nargs, char **argv) +{ + return do_cache_ctrl(1, nargs, argv); +} + +int do_cache_dis(int nargs, char **argv) +{ + return do_cache_ctrl(0, nargs, argv); +} |