rockchip: capsule: Add functions for supporting capsule updates

Add functions needed to support the UEFI capsule update feature on
rockchip boards. Currently, the feature is being enabled on the
RockPi4 boards with firmware images residing on GPT partitioned
storage media.

Signed-off-by: Sughosh Ganu <sughosh.ganu@linaro.org>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>

arch/arm/mach-rockchip/Kconfig

@@ -246,6 +246,7 @@ config ROCKCHIP_RK3399
 	select DM_PMIC
 	select DM_REGULATOR_FIXED
 	select BOARD_LATE_INIT
+	imply PARTITION_TYPE_GUID
 	imply PRE_CONSOLE_BUFFER
 	imply ROCKCHIP_COMMON_BOARD
 	imply ROCKCHIP_SDRAM_COMMON

arch/arm/mach-rockchip/board.c

@@ -6,11 +6,15 @@
 #include <clk.h>
 #include <cpu_func.h>
 #include <dm.h>
+#include <efi_loader.h>
 #include <fastboot.h>
 #include <init.h>
 #include <log.h>
+#include <mmc.h>
+#include <part.h>
 #include <ram.h>
 #include <syscon.h>
+#include <uuid.h>
 #include <asm/cache.h>
 #include <asm/global_data.h>
 #include <asm/io.h>
@@ -22,8 +26,157 @@
 
 DECLARE_GLOBAL_DATA_PTR;
 
+#if defined(CONFIG_EFI_HAVE_CAPSULE_SUPPORT) && defined(CONFIG_EFI_PARTITION)
+
+#define DFU_ALT_BUF_LEN			SZ_1K
+
+static struct efi_fw_image *fw_images;
+
+static bool updatable_image(struct disk_partition *info)
+{
+	int i;
+	bool ret = false;
+	efi_guid_t image_type_guid;
+
+	uuid_str_to_bin(info->type_guid, image_type_guid.b,
+			UUID_STR_FORMAT_GUID);
+
+	for (i = 0; i < num_image_type_guids; i++) {
+		if (!guidcmp(&fw_images[i].image_type_id, &image_type_guid)) {
+			ret = true;
+			break;
+		}
+	}
+
+	return ret;
+}
+
+static void set_image_index(struct disk_partition *info, int index)
+{
+	int i;
+	efi_guid_t image_type_guid;
+
+	uuid_str_to_bin(info->type_guid, image_type_guid.b,
+			UUID_STR_FORMAT_GUID);
+
+	for (i = 0; i < num_image_type_guids; i++) {
+		if (!guidcmp(&fw_images[i].image_type_id, &image_type_guid)) {
+			fw_images[i].image_index = index;
+			break;
+		}
+	}
+}
+
+static int get_mmc_desc(struct blk_desc **desc)
+{
+	int ret;
+	struct mmc *mmc;
+	struct udevice *dev;
+
+	/*
+	 * For now the firmware images are assumed to
+	 * be on the SD card
+	 */
+	ret = uclass_get_device(UCLASS_MMC, 1, &dev);
+	if (ret)
+		return -1;
+
+	mmc = mmc_get_mmc_dev(dev);
+	if (!mmc)
+		return -ENODEV;
+
+	if ((ret = mmc_init(mmc)))
+		return ret;
+
+	*desc = mmc_get_blk_desc(mmc);
+	if (!*desc)
+		return -1;
+
+	return 0;
+}
+
+void set_dfu_alt_info(char *interface, char *devstr)
+{
+	const char *name;
+	bool first = true;
+	int p, len, devnum, ret;
+	char buf[DFU_ALT_BUF_LEN];
+	struct disk_partition info;
+	struct blk_desc *desc = NULL;
+
+	ret = get_mmc_desc(&desc);
+	if (ret) {
+		log_err("Unable to get mmc desc\n");
+		return;
+	}
+
+	memset(buf, 0, sizeof(buf));
+	name = blk_get_uclass_name(desc->uclass_id);
+	devnum = desc->devnum;
+	len = strlen(buf);
+
+	len += snprintf(buf + len, DFU_ALT_BUF_LEN - len,
+			 "%s %d=", name, devnum);
+
+	for (p = 1; p <= MAX_SEARCH_PARTITIONS; p++) {
+		if (part_get_info(desc, p, &info))
+			continue;
+
+		/* Add entry to dfu_alt_info only for updatable images */
+		if (updatable_image(&info)) {
+			if (!first)
+				len += snprintf(buf + len,
+						DFU_ALT_BUF_LEN - len, ";");
+
+			len += snprintf(buf + len, DFU_ALT_BUF_LEN - len,
+					"%s%d_%s part %d %d",
+					name, devnum, info.name, devnum, p);
+			first = false;
+		}
+	}
+
+	log_debug("dfu_alt_info => %s\n", buf);
+	env_set("dfu_alt_info", buf);
+}
+
+static void gpt_capsule_update_setup(void)
+{
+	int p, i, ret;
+	struct disk_partition info;
+	struct blk_desc *desc = NULL;
+
+	fw_images = update_info.images;
+	rockchip_capsule_update_board_setup();
+
+	ret = get_mmc_desc(&desc);
+	if (ret) {
+		log_err("Unable to get mmc desc\n");
+		return;
+	}
+
+	for (p = 1, i = 1; p <= MAX_SEARCH_PARTITIONS; p++) {
+		if (part_get_info(desc, p, &info))
+			continue;
+
+		/*
+		 * Since we have a GPT partitioned device, the updatable
+		 * images could be stored in any order. Populate the
+		 * image_index at runtime.
+		 */
+		if (updatable_image(&info)) {
+			set_image_index(&info, i);
+			i++;
+		}
+	}
+}
+#endif /* CONFIG_EFI_HAVE_CAPSULE_SUPPORT && CONFIG_EFI_PARTITION */
+
 __weak int rk_board_late_init(void)
 {
+#if defined(CONFIG_EFI_HAVE_CAPSULE_SUPPORT) && defined(CONFIG_EFI_PARTITION)
+	gpt_capsule_update_setup();
+#endif
+
 	return 0;
 }