Add new command for enabling the background operations handshake functionality (BKOPS_EN, EXT_CSD byte [163]) on eMMC devices.
This is an optional feature of eMMCs, the setting is write-once.
Signed-off-by: Tomas Melin tomas.melin@vaisala.com --- cmd/mmc.c | 26 ++++++++++++++++++++++++++ drivers/mmc/mmc.c | 30 ++++++++++++++++++++++++++++++ include/mmc.h | 4 ++++ 3 files changed, 60 insertions(+)
diff --git a/cmd/mmc.c b/cmd/mmc.c index b2761e9..3ae9682 100644 --- a/cmd/mmc.c +++ b/cmd/mmc.c @@ -729,6 +729,29 @@ static int do_mmc_setdsr(cmd_tbl_t *cmdtp, int flag, return ret; }
+static int do_mmc_bkops_enable(cmd_tbl_t *cmdtp, int flag, + int argc, char * const argv[]) +{ + int dev; + struct mmc *mmc; + + if (argc != 2) + return CMD_RET_USAGE; + + dev = simple_strtoul(argv[1], NULL, 10); + + mmc = init_mmc_device(dev, false); + if (!mmc) + return CMD_RET_FAILURE; + + if (IS_SD(mmc)) { + puts("BKOPS_EN only exists on eMMC\n"); + return CMD_RET_FAILURE; + } + + return mmc_set_bkops_enable(mmc); +} + static cmd_tbl_t cmd_mmc[] = { U_BOOT_CMD_MKENT(info, 1, 0, do_mmcinfo, "", ""), U_BOOT_CMD_MKENT(read, 4, 1, do_mmc_read, "", ""), @@ -749,6 +772,7 @@ static cmd_tbl_t cmd_mmc[] = { U_BOOT_CMD_MKENT(rpmb, CONFIG_SYS_MAXARGS, 1, do_mmcrpmb, "", ""), #endif U_BOOT_CMD_MKENT(setdsr, 2, 0, do_mmc_setdsr, "", ""), + U_BOOT_CMD_MKENT(bkops-enable, 2, 0, do_mmc_bkops_enable, "", ""), };
static int do_mmcops(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) @@ -813,6 +837,8 @@ U_BOOT_CMD( "mmc rpmb counter - read the value of the write counter\n" #endif "mmc setdsr <value> - set DSR register value\n" + "mmc bkops-enable <dev> - enable background operations handshake on device\n" + " WARNING: This is a write-once setting.\n" );
/* Old command kept for compatibility. Same as 'mmc info' */ diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c index 0cec02c..d6f40cc 100644 --- a/drivers/mmc/mmc.c +++ b/drivers/mmc/mmc.c @@ -1810,3 +1810,33 @@ int mmc_initialize(bd_t *bis) mmc_do_preinit(); return 0; } + +int mmc_set_bkops_enable(struct mmc *mmc) +{ + int err; + ALLOC_CACHE_ALIGN_BUFFER(u8, ext_csd, MMC_MAX_BLOCK_LEN); + + err = mmc_send_ext_csd(mmc, ext_csd); + if (err) { + puts("Could not get ext_csd register values\n"); + return err; + } + + if (!(ext_csd[EXT_CSD_BKOPS_SUPPORT] & 0x1)) { + puts("Background operations not supported on device\n"); + return -EMEDIUMTYPE; + } + + if (ext_csd[EXT_CSD_BKOPS_EN] & 0x1) { + puts("Background operations already enabled\n"); + return 0; + } + + err = mmc_switch(mmc, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_BKOPS_EN, 1); + if (err) { + puts("Failed to enable background operations\n"); + return err; + } + + return 0; +} diff --git a/include/mmc.h b/include/mmc.h index 5ef37d3..0772d53 100644 --- a/include/mmc.h +++ b/include/mmc.h @@ -175,6 +175,7 @@ #define EXT_CSD_MAX_ENH_SIZE_MULT 157 /* R */ #define EXT_CSD_PARTITIONING_SUPPORT 160 /* RO */ #define EXT_CSD_RST_N_FUNCTION 162 /* R/W */ +#define EXT_CSD_BKOPS_EN 163 /* R/W */ #define EXT_CSD_WR_REL_PARAM 166 /* R */ #define EXT_CSD_WR_REL_SET 167 /* R/W */ #define EXT_CSD_RPMB_MULT 168 /* RO */ @@ -189,6 +190,7 @@ #define EXT_CSD_HC_WP_GRP_SIZE 221 /* RO */ #define EXT_CSD_HC_ERASE_GRP_SIZE 224 /* RO */ #define EXT_CSD_BOOT_MULT 226 /* RO */ +#define EXT_CSD_BKOPS_SUPPORT 502 /* RO */
/* * EXT_CSD field definitions @@ -541,6 +543,8 @@ int mmc_rpmb_read(struct mmc *mmc, void *addr, unsigned short blk, unsigned short cnt, unsigned char *key); int mmc_rpmb_write(struct mmc *mmc, void *addr, unsigned short blk, unsigned short cnt, unsigned char *key); +int mmc_set_bkops_enable(struct mmc *mmc); + /** * Start device initialization and return immediately; it does not block on * polling OCR (operation condition register) status. Then you should call