[PATCH] cmd: gpt: add eMMC and GPT support

[Rayagonda Kokatanur]

From: Corneliu Doban <cdoban at broadcom.com>

Add eMMC and GPT support.
- GPT partition list and command to create the GPT added to u-boot
  environment
- eMMC boot commands added to u-boot environment
- new gpt commands (enumarate and setenv) that are used by broadcom
  update scripts and boot commands
- eMMC specific u-boot configurations with environment saved in eMMC
  and GPT support

Signed-off-by: Corneliu Doban <cdoban at broadcom.com>
Signed-off-by: Rayagonda Kokatanur <rayagonda.kokatanur at broadcom.com>

diff --git a/cmd/gpt.c b/cmd/gpt.c
index b8d11c167d..c32e272b25 100644
--- a/cmd/gpt.c
+++ b/cmd/gpt.c
@@ -616,6 +616,87 @@ static int gpt_verify(struct blk_desc *blk_dev_desc, const char *str_part)
 	return ret;
 }
 
+/*
+ * Enumerate partition names into environment variable.
+ */
+static int gpt_enumerate(struct blk_desc *blk_dev_desc)
+{
+	disk_partition_t pinfo;
+	struct part_driver *first_drv =
+		ll_entry_start(struct part_driver, part_driver);
+	const int n_drvs = ll_entry_count(struct part_driver, part_driver);
+	struct part_driver *part_drv;
+	char part_list[2048];
+
+	part_list[0] = 0;
+
+	for (part_drv = first_drv; part_drv != first_drv + n_drvs; part_drv++) {
+		int ret;
+		int i;
+
+		for (i = 1; i < part_drv->max_entries; i++) {
+			ret = part_drv->get_info(blk_dev_desc, i, &pinfo);
+			if (ret != 0) {
+				/* no more entries in table */
+				break;
+			}
+			strcat(part_list, (const char *)pinfo.name);
+			strcat(part_list, " ");
+		}
+	}
+	if (strlen(part_list) > 0)
+		part_list[strlen(part_list) - 1] = 0;
+	debug("setenv gpt_partition_list %s\n", part_list);
+	env_set("gpt_partition_list", part_list);
+	return 0;
+}
+
+/*
+ * Dynamically setup environment variables for name, index, offset and size
+ * for partition in GPT table after running "gpt setenv" for a partition name.
+ * gpt_partition_name, gpt_partition_entry, gpt_partition_addr and
+ * gpt_partition_size environment variables will be set.
+ */
+static int gpt_setenv(struct blk_desc *blk_dev_desc, const char *name)
+{
+	disk_partition_t pinfo;
+	struct part_driver *first_drv =
+		ll_entry_start(struct part_driver, part_driver);
+	const int n_drvs = ll_entry_count(struct part_driver, part_driver);
+	struct part_driver *part_drv;
+	char buf[32];
+
+	for (part_drv = first_drv; part_drv != first_drv + n_drvs; part_drv++) {
+		int ret;
+		int i;
+
+		for (i = 1; i < part_drv->max_entries; i++) {
+			ret = part_drv->get_info(blk_dev_desc, i, &pinfo);
+			if (ret != 0) {
+				/* no more entries in table */
+				break;
+			}
+			if (strcmp(name, (const char *)pinfo.name) == 0) {
+				/* match found, setup environment variables */
+				sprintf(buf, LBAF, pinfo.start);
+				debug("setenv gpt_partition_addr %s\n", buf);
+				env_set("gpt_partition_addr", buf);
+				sprintf(buf, LBAF, pinfo.size);
+				debug("setenv gpt_partition_size %s\n", buf);
+				env_set("gpt_partition_size", buf);
+				sprintf(buf, "%d", i);
+				debug("setenv gpt_partition_entry %s\n", buf);
+				env_set("gpt_partition_entry", buf);
+				sprintf(buf, "%s", pinfo.name);
+				debug("setenv gpt_partition_name %s\n", buf);
+				env_set("gpt_partition_name", buf);
+				return 0;
+			}
+		}
+	}
+	return -1;
+}
+
 static int do_disk_guid(struct blk_desc *dev_desc, char * const namestr)
 {
 	int ret;
@@ -822,6 +903,10 @@ static int do_gpt(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 	} else if ((strcmp(argv[1], "verify") == 0)) {
 		ret = gpt_verify(blk_dev_desc, argv[4]);
 		printf("Verify GPT: ");
+	} else if ((strcmp(argv[1], "setenv") == 0)) {
+		ret = gpt_setenv(blk_dev_desc, argv[4]);
+	} else if ((strcmp(argv[1], "enumerate") == 0)) {
+		ret = gpt_enumerate(blk_dev_desc);
 	} else if (strcmp(argv[1], "guid") == 0) {
 		ret = do_disk_guid(blk_dev_desc, argv[4]);
 #ifdef CONFIG_CMD_GPT_RENAME
@@ -852,7 +937,17 @@ U_BOOT_CMD(gpt, CONFIG_SYS_MAXARGS, 1, do_gpt,
 	" to interface\n"
 	" Example usage:\n"
 	" gpt write mmc 0 $partitions\n"
+	"    - write the GPT to device\n"
 	" gpt verify mmc 0 $partitions\n"
+	"    - verify the GPT on device against $partitions\n"
+	" gpt setenv mmc 0 $name\n"
+	"    - setup environment variables for partition $name:\n"
+	"      gpt_partition_addr, gpt_partition_size,\n"
+	"      gpt_partition_name, gpt_partition_entry\n"
+	" gpt enumerate mmc 0\n"
+	"    - store list of partitions to gpt_partition_list environment variable\n"
+	" read <interface> <dev>\n"
+	"    - read GPT into a data structure for manipulation\n"
 	" gpt guid <interface> <dev>\n"
 	"    - print disk GUID\n"
 	" gpt guid <interface> <dev> <varname>\n"
-- 
2.17.1