Dear Chris,
Could you merge the this at mmc-utils?
If you have any other opinion, plz let me know.
Best Regards,
Jaehoon Chung
On 07/20/2012 12:12 AM, Jaehoon Chung wrote:
> 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.
>
> <usage>
> #mmc bkops enable /dev/mmcblk0
>
> Signed-off-by: Jaehoon Chung <jh80.chung@xxxxxxxxxxx>
> Signed-off-by: Kyungmin Park <kyungmin.park@xxxxxxxxxxx>
> Reviewd-by: Venkatraman S <svenkatr@xxxxxx>
> ---
> mmc.c | 5 +++++
> mmc.h | 7 +++++++
> mmc_cmds.c | 39 +++++++++++++++++++++++++++++++++++++++
> mmc_cmds.h | 1 +
> 4 files changed, 52 insertions(+), 0 deletions(-)
>
> diff --git a/mmc.c b/mmc.c
> index 379d667..d5ef2bb 100644
> --- a/mmc.c
> +++ b/mmc.c
> @@ -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>.",
> + NULL
> + },
> { 0, 0, 0, 0 }
> };
>
> diff --git a/mmc.h b/mmc.h
> index 0a521a8..3d77b38 100644
> --- a/mmc.h
> +++ b/mmc.h
> @@ -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)
> diff --git a/mmc_cmds.c b/mmc_cmds.c
> index 90619db..4c935e0 100644
> --- a/mmc_cmds.c
> +++ b/mmc_cmds.c
> @@ -280,6 +280,45 @@ 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 dosen'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;
> diff --git a/mmc_cmds.h b/mmc_cmds.h
> index 2eb1df5..1dd4324 100644
> --- a/mmc_cmds.h
> +++ b/mmc_cmds.h
> @@ -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);
>
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