Hi,
On 11/16/2016 06:59 PM, tomas.melin@vaisala.com wrote:
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.
Why needs to set bkops on bootloader? Is there special reason? And Linux kernel has already discussed about this.
I don't want to provide this command on u-boot side. Don't handle Onetime programmable register on u-boot. So NACK.
Best Regards, Jaehoon Chung
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