/*
   * Copyright 2014 Broadcom Corporation.
   *
   * SPDX-License-Identifier:	GPL-2.0+
   */

  #include <config.h>

  #include <common.h>

  #include <blk.h>

  #include <fastboot.h>

  #include <fb_mmc.h>

  #include <image-sparse.h>

  #include <part.h>

  #include <mmc.h>

  #include <div64.h>

  /*
   * FIXME: Ensure we always set these names via Kconfig once xxx_PARTITION is
   * migrated
   */
  #ifndef CONFIG_FASTBOOT_GPT_NAME
  #define CONFIG_FASTBOOT_GPT_NAME "gpt"

  #endif

  #ifndef CONFIG_FASTBOOT_MBR_NAME

  #define CONFIG_FASTBOOT_MBR_NAME "mbr"
  #endif

  struct fb_mmc_sparse {

  	struct blk_desc	*dev_desc;

  };

  static int part_get_info_by_name_or_alias(struct blk_desc *dev_desc,

  		const char *name, disk_partition_t *info)
  {
  	int ret;

  	ret = part_get_info_by_name(dev_desc, name, info);

  	if (ret) {
  		/* strlen("fastboot_partition_alias_") + 32(part_name) + 1 */
  		char env_alias_name[25 + 32 + 1];
  		char *aliased_part_name;
  
  		/* check for alias */
  		strcpy(env_alias_name, "fastboot_partition_alias_");
  		strncat(env_alias_name, name, 32);
  		aliased_part_name = getenv(env_alias_name);
  		if (aliased_part_name != NULL)

  			ret = part_get_info_by_name(dev_desc,

  					aliased_part_name, info);
  	}
  	return ret;
  }

  static lbaint_t fb_mmc_sparse_write(struct sparse_storage *info,
  		lbaint_t blk, lbaint_t blkcnt, const void *buffer)

  {

  	struct fb_mmc_sparse *sparse = info->priv;

  	struct blk_desc *dev_desc = sparse->dev_desc;

  	return blk_dwrite(dev_desc, blk, blkcnt, buffer);

  }

  static lbaint_t fb_mmc_sparse_reserve(struct sparse_storage *info,
  		lbaint_t blk, lbaint_t blkcnt)
  {
  	return blkcnt;
  }

  static void write_raw_image(struct blk_desc *dev_desc, disk_partition_t *info,

  		const char *part_name, void *buffer,
  		unsigned int download_bytes)
  {
  	lbaint_t blkcnt;
  	lbaint_t blks;
  
  	/* determine number of blocks to write */
  	blkcnt = ((download_bytes + (info->blksz - 1)) & ~(info->blksz - 1));

  	blkcnt = lldiv(blkcnt, info->blksz);

  
  	if (blkcnt > info->size) {
  		error("too large for partition: '%s'
  ", part_name);

  		fastboot_fail("too large for partition");

  		return;
  	}
  
  	puts("Flashing Raw Image
  ");

  	blks = blk_dwrite(dev_desc, info->start, blkcnt, buffer);

  	if (blks != blkcnt) {

  		error("failed writing to device %d
  ", dev_desc->devnum);

  		fastboot_fail("failed writing to device");

  		return;
  	}
  
  	printf("........ wrote " LBAFU " bytes to '%s'
  ", blkcnt * info->blksz,
  	       part_name);

  	fastboot_okay("");

  }

  void fb_mmc_flash_write(const char *cmd, void *download_buffer,

  			unsigned int download_bytes)

  {

  	struct blk_desc *dev_desc;

  	disk_partition_t info;

  	dev_desc = blk_get_dev("mmc", CONFIG_FASTBOOT_FLASH_MMC_DEV);

  	if (!dev_desc || dev_desc->type == DEV_TYPE_UNKNOWN) {
  		error("invalid mmc device
  ");

  		fastboot_fail("invalid mmc device");

  		return;
  	}

  #if CONFIG_IS_ENABLED(EFI_PARTITION)

  	if (strcmp(cmd, CONFIG_FASTBOOT_GPT_NAME) == 0) {
  		printf("%s: updating MBR, Primary and Backup GPT(s)
  ",
  		       __func__);
  		if (is_valid_gpt_buf(dev_desc, download_buffer)) {
  			printf("%s: invalid GPT - refusing to write to flash
  ",
  			       __func__);

  			fastboot_fail("invalid GPT partition");

  			return;
  		}
  		if (write_mbr_and_gpt_partitions(dev_desc, download_buffer)) {
  			printf("%s: writing GPT partitions failed
  ", __func__);

  			fastboot_fail("writing GPT partitions failed");

  			return;
  		}
  		printf("........ success
  ");

  		fastboot_okay("");

  		return;

  	}
  #endif

  #if CONFIG_IS_ENABLED(DOS_PARTITION)

  	if (strcmp(cmd, CONFIG_FASTBOOT_MBR_NAME) == 0) {
  		printf("%s: updating MBR
  ", __func__);
  		if (is_valid_dos_buf(download_buffer)) {
  			printf("%s: invalid MBR - refusing to write to flash
  ",
  			       __func__);
  			fastboot_fail("invalid MBR partition");
  			return;
  		}
  		if (write_mbr_partition(dev_desc, download_buffer)) {
  			printf("%s: writing MBR partition failed
  ", __func__);
  			fastboot_fail("writing MBR partition failed");
  			return;
  		}
  		printf("........ success
  ");
  		fastboot_okay("");
  		return;
  	}
  #endif
  
  	if (part_get_info_by_name_or_alias(dev_desc, cmd, &info)) {

  		error("cannot find partition: '%s'
  ", cmd);

  		fastboot_fail("cannot find partition");

  		return;
  	}

  	if (is_sparse_image(download_buffer)) {
  		struct fb_mmc_sparse sparse_priv;

  		struct sparse_storage sparse;

  
  		sparse_priv.dev_desc = dev_desc;

  		sparse.blksz = info.blksz;

  		sparse.start = info.start;
  		sparse.size = info.size;

  		sparse.write = fb_mmc_sparse_write;

  		sparse.reserve = fb_mmc_sparse_reserve;

  
  		printf("Flashing sparse image at offset " LBAFU "
  ",

  		       sparse.start);

  		sparse.priv = &sparse_priv;
  		write_sparse_image(&sparse, cmd, download_buffer,

  				   download_bytes);

  	} else {

  		write_raw_image(dev_desc, &info, cmd, download_buffer,
  				download_bytes);

  	}

  }

  void fb_mmc_erase(const char *cmd)

  {
  	int ret;

  	struct blk_desc *dev_desc;

  	disk_partition_t info;
  	lbaint_t blks, blks_start, blks_size, grp_size;
  	struct mmc *mmc = find_mmc_device(CONFIG_FASTBOOT_FLASH_MMC_DEV);
  
  	if (mmc == NULL) {
  		error("invalid mmc device");

  		fastboot_fail("invalid mmc device");

  		return;
  	}

  	dev_desc = blk_get_dev("mmc", CONFIG_FASTBOOT_FLASH_MMC_DEV);

  	if (!dev_desc || dev_desc->type == DEV_TYPE_UNKNOWN) {
  		error("invalid mmc device");

  		fastboot_fail("invalid mmc device");

  		return;
  	}

  	ret = part_get_info_by_name_or_alias(dev_desc, cmd, &info);

  	if (ret) {
  		error("cannot find partition: '%s'", cmd);

  		fastboot_fail("cannot find partition");

  		return;
  	}
  
  	/* Align blocks to erase group size to avoid erasing other partitions */
  	grp_size = mmc->erase_grp_size;
  	blks_start = (info.start + grp_size - 1) & ~(grp_size - 1);
  	if (info.size >= grp_size)
  		blks_size = (info.size - (blks_start - info.start)) &
  				(~(grp_size - 1));
  	else
  		blks_size = 0;
  
  	printf("Erasing blocks " LBAFU " to " LBAFU " due to alignment
  ",
  	       blks_start, blks_start + blks_size);

  	blks = blk_derase(dev_desc, blks_start, blks_size);

  	if (blks != blks_size) {

  		error("failed erasing from device %d", dev_desc->devnum);

  		fastboot_fail("failed erasing from device");

  		return;
  	}
  
  	printf("........ erased " LBAFU " bytes from '%s'
  ",
  	       blks_size * info.blksz, cmd);

  	fastboot_okay("");

  }