diff options
author | Jaehoon Chung <jh80.chung@samsung.com> | 2012-09-21 10:08:05 +0000 |
---|---|---|
committer | Chris Ball <cjb@laptop.org> | 2012-09-21 18:15:23 +0800 |
commit | 8649651b743a5d7c290ea0f8058794f8d127736e (patch) | |
tree | d6b36ab528ad9ea151ef791733f7762004eb253b | |
parent | b7e2599c67408c38e57e91d2426c077a4541dc8c (diff) | |
download | mmc-utils-8649651b743a5d7c290ea0f8058794f8d127736e.tar.gz |
Add method for enabling bkops via one-time fuse.
This patch added the method to enable the bkops.
In ext_csd register, BKOPS_EN bit is one-time programable.
So if you want to use the bkops, use the this command.
$ mmc bkops enable /dev/mmcblk0
Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Reviewd-by: Venkatraman S <svenkatr@ti.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
-rw-r--r-- | mmc.c | 5 | ||||
-rw-r--r-- | mmc.h | 7 | ||||
-rw-r--r-- | mmc_cmds.c | 38 | ||||
-rw-r--r-- | mmc_cmds.h | 1 |
4 files changed, 51 insertions, 0 deletions
@@ -75,6 +75,11 @@ static struct Command commands[] = { "Enable the boot partition for the <device>.\nTo receive acknowledgment of boot from the card set <send_ack>\nto 1, else set it to 0.", NULL }, + { do_write_bkops_en, -1, + "bkops enable", "<device>\n" + "Enable the eMMC BKOPS feature on <device>.\nNOTE! This is a one-time programmable (unreversible) change.", + NULL + }, { 0, 0, 0, 0 } }; @@ -31,12 +31,14 @@ */ #define EXT_CSD_S_CMD_SET 504 #define EXT_CSD_HPI_FEATURE 503 +#define EXT_CSD_BKOPS_SUPPORT 502 /* RO */ #define EXT_CSD_BOOT_INFO 228 /* R/W */ #define EXT_CSD_PART_SWITCH_TIME 199 #define EXT_CSD_BOOT_CFG 179 #define EXT_CSD_PART_CONFIG 179 #define EXT_CSD_BOOT_WP 173 #define EXT_CSD_WR_REL_PARAM 166 +#define EXT_CSD_BKOPS_EN 163 /* R/W */ #define EXT_CSD_NATIVE_SECTOR_SIZE 63 /* R */ #define EXT_CSD_USE_NATIVE_SECTOR 62 /* R/W */ #define EXT_CSD_DATA_SECTOR_SIZE 61 /* R */ @@ -48,6 +50,11 @@ #define EN_REL_WR (1<<2) /* + * BKOPS_EN field definition + */ +#define BKOPS_ENABLE (1<<0) + +/* * EXT_CSD field definitions */ #define EXT_CSD_HPI_SUPP (1<<0) @@ -280,6 +280,44 @@ int do_write_boot_en(int nargs, char **argv) return ret; } +int do_write_bkops_en(int nargs, char **argv) +{ + __u8 ext_csd[512], value = 0; + int fd, ret; + char *device; + + CHECK(nargs != 2, "Usage: mmc bkops 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_BKOPS_SUPPORT] & 0x1)) { + fprintf(stderr, "%s doesn't support BKOPS\n", device); + exit(1); + } + + ret = write_extcsd_value(fd, EXT_CSD_BKOPS_EN, BKOPS_ENABLE); + if (ret) { + fprintf(stderr, "Could not write 0x%02x to EXT_CSD[%d] in %s\n", + value, EXT_CSD_BKOPS_EN, device); + exit(1); + } + + return ret; +} + int do_read_extcsd(int nargs, char **argv) { __u8 ext_csd[512], ext_csd_rev, reg; @@ -21,3 +21,4 @@ int do_writeprotect_get(int nargs, char **argv); int do_writeprotect_set(int nargs, char **argv); int do_disable_512B_emulation(int nargs, char **argv); int do_write_boot_en(int nargs, char **argv); +int do_write_bkops_en(int nargs, char **argv); |