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mmc: add bkops-enable command

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Add new command that provides possibility to enable 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.
The command must be explicitly taken into use with
CONFIG_CMD_BKOPS_ENABLE.

Signed-off-by: Tomas Melin <tomas.melin@vaisala.com>
This commit is contained in:
Tomas Melin
2016-11-25 11:01:03 +02:00
committed by Jaehoon Chung
parent f0ecfc5e7e
commit cd3d48807d
4 changed files with 81 additions and 0 deletions
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cmd/Kconfig
+9
View File
@@ -572,6 +572,15 @@ config SYS_AMBAPP_PRINT_ON_STARTUP
help
Show AMBA Plug-n-Play information on startup.
config CMD_BKOPS_ENABLE
bool "mmc bkops enable"
depends on CMD_MMC
default n
help
Enable command for setting manual background operations handshake
on a eMMC device. The feature is optionally available on eMMC devices
conforming to standard >= 4.41.
config CMD_BLOCK_CACHE
bool "blkcache - control and stats for block cache"
depends on BLOCK_CACHE
cmd/mmc.c
+32
View File
@@ -729,6 +729,31 @@ static int do_mmc_setdsr(cmd_tbl_t *cmdtp, int flag,
return ret;
}
#ifdef CONFIG_CMD_BKOPS_ENABLE
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);
}
#endif
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 +774,9 @@ 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, "", ""),
#ifdef CONFIG_CMD_BKOPS_ENABLE
U_BOOT_CMD_MKENT(bkops-enable, 2, 0, do_mmc_bkops_enable, "", ""),
#endif
};
static int do_mmcops(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
@@ -813,6 +841,10 @@ U_BOOT_CMD(
"mmc rpmb counter - read the value of the write counter\n"
#endif
"mmc setdsr <value> - set DSR register value\n"
#ifdef CONFIG_CMD_BKOPS_ENABLE
"mmc bkops-enable <dev> - enable background operations handshake on device\n"
" WARNING: This is a write-once setting.\n"
#endif
);
/* Old command kept for compatibility. Same as 'mmc info' */