Add method for enabling bkops via one-time fuse.
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.
$ mmc bkops enable /dev/mmcblk0
Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Reviewd-by: Venkatraman S <svenkatr@ti.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
diff --git a/mmc_cmds.c b/mmc_cmds.c
index 90619db..05d7e13 100644
--- a/mmc_cmds.c
+++ b/mmc_cmds.c
@@ -280,6 +280,44 @@
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 doesn'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;