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.ch...@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.p...@samsung.com>
Reviewd-by: Venkatraman S <svenk...@ti.com>
---
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);
--
1.7.4.1
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