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.me...@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
--
2.1.4
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