fastboot: mt85xx: add command to flash/erase emmc hwpart

This patch includes the following:
1. Add fastboot command to erase the whole EMMC_USER
2. Add fastboot command to flash image at EMMC_BOOT1
3. Add fastboot command to erase the whole EMMC_BOOT1
4. Enale CONFIG_FASTBOOT_MMC_BOOT1_SUPPORT for mt8518

Signed-off-by: mingming lee <mingming.lee@mediatek.com>

2 files changed, 132 insertions, 0 deletions

diff --git a/drivers/fastboot/Kconfig b/drivers/fastboot/Kconfig
index 9f85054bfb..d4436dfc91 100644
--- a/drivers/fastboot/Kconfig
+++ b/drivers/fastboot/Kconfig
@@ -104,6 +104,36 @@ config FASTBOOT_FLASH_NAND_TRIMFFS
 	  When flashing NAND enable the DROP_FFS flag to drop trailing all-0xff
 	  pages.
 
+config FASTBOOT_MMC_BOOT1_SUPPORT
+	bool "Enable EMMC_BOOT1 flash/erase"
+	depends on FASTBOOT_FLASH_MMC && EFI_PARTITION && ARCH_MEDIATEK
+	help
+	  The fastboot "flash" and "erase" commands normally does operations
+	  on EMMC userdata. Define this to enable the special commands to
+	  flash/erase EMMC_BOOT1.
+	  The default target name for updating EMMC_BOOT1 is "mmc0boot0".
+
+config FASTBOOT_MMC_BOOT1_NAME
+	string "Target name for updating EMMC_BOOT1"
+	depends on FASTBOOT_MMC_BOOT1_SUPPORT
+	default "mmc0boot0"
+	help
+	  The fastboot "flash" and "erase" commands support operations on
+	  EMMC_BOOT1. This occurs when the specified "EMMC_BOOT1 name" on
+	  the "fastboot flash" and "fastboot erase" commands match the value
+	  defined here.
+	  The default target name for updating EMMC_BOOT1 is "mmc0boot0".
+
+config FASTBOOT_MMC_USER_NAME
+	string "Target name for erasing EMMC_USER"
+	depends on FASTBOOT_FLASH_MMC && EFI_PARTITION && ARCH_MEDIATEK
+	default "mmc0"
+	help
+	  The fastboot "erase" command supports erasing EMMC_USER. This occurs
+	  when the specified "EMMC_USER name" on the "fastboot erase" commands
+	  match the value defined here.
+	  The default target name for erasing EMMC_USER is "mmc0".
+
 config FASTBOOT_GPT_NAME
 	string "Target name for updating GPT"
 	depends on FASTBOOT_FLASH_MMC && EFI_PARTITION
diff --git a/drivers/fastboot/fb_mmc.c b/drivers/fastboot/fb_mmc.c
index b0b19c5762..d7cf9f4aac 100644
--- a/drivers/fastboot/fb_mmc.c
+++ b/drivers/fastboot/fb_mmc.c
@@ -129,6 +129,76 @@ static void write_raw_image(struct blk_desc *dev_desc, disk_partition_t *info,
 	fastboot_okay(NULL, response);
 }
 
+#ifdef CONFIG_FASTBOOT_MMC_BOOT1_SUPPORT
+static int fb_mmc_erase_mmc_hwpart(struct blk_desc *dev_desc)
+{
+	lbaint_t blks;
+
+	debug("Start Erasing mmc hwpart[%u]...\n", dev_desc->hwpart);
+
+	blks = fb_mmc_blk_write(dev_desc, 0, dev_desc->lba, NULL);
+
+	if (blks != dev_desc->lba) {
+		pr_err("Failed to erase mmc hwpart[%u]\n", dev_desc->hwpart);
+		return 1;
+	}
+
+	printf("........ erased %lu bytes from mmc hwpart[%u]\n",
+	       dev_desc->lba * dev_desc->blksz, dev_desc->hwpart);
+
+	return 0;
+}
+
+static void fb_mmc_boot1_ops(struct blk_desc *dev_desc, void *buffer,
+			     u32 buff_sz, char *response)
+{
+	lbaint_t blkcnt;
+	lbaint_t blks;
+	unsigned long blksz;
+
+	// To operate on EMMC_BOOT1 (mmc0boot0), we first change the hwpart
+	if (blk_dselect_hwpart(dev_desc, 1)) {
+		pr_err("Failed to select hwpart\n");
+		fastboot_fail("Failed to select hwpart", response);
+		return;
+	}
+
+	if (buffer) { /* flash */
+
+		/* determine number of blocks to write */
+		blksz = dev_desc->blksz;
+		blkcnt = ((buff_sz + (blksz - 1)) & ~(blksz - 1));
+		blkcnt = lldiv(blkcnt, blksz);
+
+		if (blkcnt > dev_desc->lba) {
+			pr_err("Image size too large\n");
+			fastboot_fail("Image size too large", response);
+			return;
+		}
+
+		debug("Start Flashing Image to EMMC_BOOT1...\n");
+
+		blks = fb_mmc_blk_write(dev_desc, 0, blkcnt, buffer);
+
+		if (blks != blkcnt) {
+			pr_err("Failed to write EMMC_BOOT1\n");
+			fastboot_fail("Failed to write EMMC_BOOT1", response);
+			return;
+		}
+
+		printf("........ wrote %lu bytes to EMMC_BOOT1\n",
+		       blkcnt * blksz);
+	} else { /* erase */
+		if (fb_mmc_erase_mmc_hwpart(dev_desc)) {
+			fastboot_fail("Failed to erase EMMC_BOOT1", response);
+			return;
+		}
+	}
+
+	fastboot_okay(NULL, response);
+}
+#endif
+
 #ifdef CONFIG_ANDROID_BOOT_IMAGE
 /**
  * Read Android boot image header from boot partition.
@@ -345,8 +415,21 @@ void fastboot_mmc_flash_write(const char *cmd, void *download_buffer,
 		return;
 	}
 
+#ifdef CONFIG_FASTBOOT_MMC_BOOT1_SUPPORT
+	if (strcmp(cmd, CONFIG_FASTBOOT_MMC_BOOT1_NAME) == 0) {
+		fb_mmc_boot1_ops(dev_desc, download_buffer,
+				 download_bytes, response);
+		return;
+	}
+#endif
+
 #if CONFIG_IS_ENABLED(EFI_PARTITION)
+#ifndef CONFIG_FASTBOOT_MMC_USER_NAME
 	if (strcmp(cmd, CONFIG_FASTBOOT_GPT_NAME) == 0) {
+#else
+	if (strcmp(cmd, CONFIG_FASTBOOT_GPT_NAME) == 0 ||
+	    strcmp(cmd, CONFIG_FASTBOOT_MMC_USER_NAME) == 0) {
+#endif
 		printf("%s: updating MBR, Primary and Backup GPT(s)\n",
 		       __func__);
 		if (is_valid_gpt_buf(dev_desc, download_buffer)) {
@@ -457,6 +540,25 @@ void fastboot_mmc_erase(const char *cmd, char *response)
 		return;
 	}
 
+#ifdef CONFIG_FASTBOOT_MMC_BOOT1_SUPPORT
+	if (strcmp(cmd, CONFIG_FASTBOOT_MMC_BOOT1_NAME) == 0) {
+		/* erase EMMC boot1 */
+		fb_mmc_boot1_ops(dev_desc, NULL, 0, response);
+		return;
+	}
+#endif
+
+#ifdef CONFIG_FASTBOOT_MMC_USER_NAME
+	if (strcmp(cmd, CONFIG_FASTBOOT_MMC_USER_NAME) == 0) {
+		/* erase EMMC userdata */
+		if (fb_mmc_erase_mmc_hwpart(dev_desc))
+			fastboot_fail("Failed to erase EMMC_USER", response);
+		else
+			fastboot_okay(NULL, response);
+		return;
+	}
+#endif
+
 	ret = part_get_info_by_name_or_alias(dev_desc, cmd, &info);
 	if (ret < 0) {
 		pr_err("cannot find partition: '%s'\n", cmd);