COMMON: MMC: Command to support EMMC booting and to resize EMMC boot partition

This patch adds commands to access(open/close) and resize boot partitions on EMMC.

Signed-off-by: Amar <amarendra.xt@samsung.com>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>

diff --git a/common/cmd_mmc.c b/common/cmd_mmc.c
index 7d824690b7f064547a3400bd65a957538a4289f0..5f1ed430e03bc844ac4ffbf36760cf722f38ba55 100644 (file)
--- a/common/cmd_mmc.c
+++ b/common/cmd_mmc.c
@@ -147,6 +147,36 @@ U_BOOT_CMD(
        "- display info of the current MMC device"
 );
 
+#ifdef CONFIG_SUPPORT_EMMC_BOOT
+static int boot_part_access(struct mmc *mmc, u8 ack, u8 part_num, u8 access)
+{
+       int err;
+       err = mmc_boot_part_access(mmc, ack, part_num, access);
+
+       if ((err == 0) && (access != 0)) {
+               printf("\t\t\t!!!Notice!!!\n");
+
+               printf("!You must close EMMC boot Partition");
+               printf("after all images are written\n");
+
+               printf("!EMMC boot partition has continuity");
+               printf("at image writing time.\n");
+
+               printf("!So, do not close the boot partition");
+               printf("before all images are written.\n");
+               return 0;
+       } else if ((err == 0) && (access == 0))
+               return 0;
+       else if ((err != 0) && (access != 0)) {
+               printf("EMMC boot partition-%d OPEN Failed.\n", part_num);
+               return 1;
+       } else {
+               printf("EMMC boot partition-%d CLOSE Failed.\n", part_num);
+               return 1;
+       }
+}
+#endif
+
 static int do_mmcops(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 {
        enum mmc_state state;
@@ -258,8 +288,74 @@ static int do_mmcops(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
                                curr_device, mmc->part_num);
 
                return 0;
-       }
+#ifdef CONFIG_SUPPORT_EMMC_BOOT
+       } else if ((strcmp(argv[1], "open") == 0) ||
+                       (strcmp(argv[1], "close") == 0)) {
+               int dev;
+               struct mmc *mmc;
+               u8 part_num, access = 0;
+
+               if (argc == 4) {
+                       dev = simple_strtoul(argv[2], NULL, 10);
+                       part_num = simple_strtoul(argv[3], NULL, 10);
+               } else {
+                       return CMD_RET_USAGE;
+               }
+
+               mmc = find_mmc_device(dev);
+               if (!mmc) {
+                       printf("no mmc device at slot %x\n", dev);
+                       return 1;
+               }
 
+               if (IS_SD(mmc)) {
+                       printf("SD device cannot be opened/closed\n");
+                       return 1;
+               }
+
+               if ((part_num <= 0) || (part_num > MMC_NUM_BOOT_PARTITION)) {
+                       printf("Invalid boot partition number:\n");
+                       printf("Boot partition number cannot be <= 0\n");
+                       printf("EMMC44 supports only 2 boot partitions\n");
+                       return 1;
+               }
+
+               if (strcmp(argv[1], "open") == 0)
+                       access = part_num; /* enable R/W access to boot part*/
+               else
+                       access = 0; /* No access to boot partition */
+
+               /* acknowledge to be sent during boot operation */
+               return boot_part_access(mmc, 1, part_num, access);
+
+       } else if (strcmp(argv[1], "bootpart") == 0) {
+               int dev;
+               dev = simple_strtoul(argv[2], NULL, 10);
+
+               u32 bootsize = simple_strtoul(argv[3], NULL, 10);
+               u32 rpmbsize = simple_strtoul(argv[4], NULL, 10);
+               struct mmc *mmc = find_mmc_device(dev);
+               if (!mmc) {
+                       printf("no mmc device at slot %x\n", dev);
+                       return 1;
+               }
+
+               if (IS_SD(mmc)) {
+                       printf("It is not a EMMC device\n");
+                       return 1;
+               }
+
+               if (0 == mmc_boot_partition_size_change(mmc,
+                                                       bootsize, rpmbsize)) {
+                       printf("EMMC boot partition Size %d MB\n", bootsize);
+                       printf("EMMC RPMB partition Size %d MB\n", rpmbsize);
+                       return 0;
+               } else {
+                       printf("EMMC boot partition Size change Failed.\n");
+                       return 1;
+               }
+#endif /* CONFIG_SUPPORT_EMMC_BOOT */
+       }
        state = MMC_INVALID;
        if (argc == 5 && strcmp(argv[1], "read") == 0)
                state = MMC_READ;
@@ -334,5 +430,14 @@ U_BOOT_CMD(
        "mmc rescan\n"
        "mmc part - lists available partition on current mmc device\n"
        "mmc dev [dev] [part] - show or set current mmc device [partition]\n"
-       "mmc list - lists available devices");
+       "mmc list - lists available devices\n"
+#ifdef CONFIG_SUPPORT_EMMC_BOOT
+       "mmc open <dev> <boot_partition>\n"
+       " - Enable boot_part for booting and enable R/W access of boot_part\n"
+       "mmc close <dev> <boot_partition>\n"
+       " - Enable boot_part for booting and disable access to boot_part\n"
+       "mmc bootpart <device num> <boot part size MB> <RPMB part size MB>\n"
+       " - change sizes of boot and RPMB partions of specified device\n"
 #endif
+       );
+#endif /* !CONFIG_GENERIC_MMC */