diff options
Diffstat (limited to 'drivers/fastboot/fb_mmc.c')
| -rw-r--r-- | drivers/fastboot/fb_mmc.c | 488 |
1 files changed, 488 insertions, 0 deletions
diff --git a/drivers/fastboot/fb_mmc.c b/drivers/fastboot/fb_mmc.c new file mode 100644 index 0000000000..4c1c7fd2cd --- /dev/null +++ b/drivers/fastboot/fb_mmc.c @@ -0,0 +1,488 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright 2014 Broadcom Corporation. + */ + +#include <config.h> +#include <common.h> +#include <blk.h> +#include <fastboot.h> +#include <fastboot-internal.h> +#include <fb_mmc.h> +#include <image-sparse.h> +#include <part.h> +#include <mmc.h> +#include <div64.h> +#include <linux/compat.h> +#include <android_image.h> + +#define FASTBOOT_MAX_BLK_WRITE 16384 + +#define BOOT_PARTITION_NAME "boot" + +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 < 0) { + /* 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 = env_get(env_alias_name); + if (aliased_part_name != NULL) + ret = part_get_info_by_name(dev_desc, + aliased_part_name, info); + } + return ret; +} + +/** + * fb_mmc_blk_write() - Write/erase MMC in chunks of FASTBOOT_MAX_BLK_WRITE + * + * @block_dev: Pointer to block device + * @start: First block to write/erase + * @blkcnt: Count of blocks + * @buffer: Pointer to data buffer for write or NULL for erase + */ +static lbaint_t fb_mmc_blk_write(struct blk_desc *block_dev, lbaint_t start, + lbaint_t blkcnt, const void *buffer) +{ + lbaint_t blk = start; + lbaint_t blks_written; + lbaint_t cur_blkcnt; + lbaint_t blks = 0; + int i; + + for (i = 0; i < blkcnt; i += FASTBOOT_MAX_BLK_WRITE) { + cur_blkcnt = min((int)blkcnt - i, FASTBOOT_MAX_BLK_WRITE); + if (buffer) { + if (fastboot_progress_callback) + fastboot_progress_callback("writing"); + blks_written = blk_dwrite(block_dev, blk, cur_blkcnt, + buffer + (i * block_dev->blksz)); + } else { + if (fastboot_progress_callback) + fastboot_progress_callback("erasing"); + blks_written = blk_derase(block_dev, blk, cur_blkcnt); + } + blk += blks_written; + blks += blks_written; + } + return blks; +} + +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 fb_mmc_blk_write(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, + u32 download_bytes, char *response) +{ + 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) { + pr_err("too large for partition: '%s'\n", part_name); + fastboot_fail("too large for partition", response); + return; + } + + puts("Flashing Raw Image\n"); + + blks = fb_mmc_blk_write(dev_desc, info->start, blkcnt, buffer); + + if (blks != blkcnt) { + pr_err("failed writing to device %d\n", dev_desc->devnum); + fastboot_fail("failed writing to device", response); + return; + } + + printf("........ wrote " LBAFU " bytes to '%s'\n", blkcnt * info->blksz, + part_name); + fastboot_okay(NULL, response); +} + +#ifdef CONFIG_ANDROID_BOOT_IMAGE +/** + * Read Android boot image header from boot partition. + * + * @param[in] dev_desc MMC device descriptor + * @param[in] info Boot partition info + * @param[out] hdr Where to store read boot image header + * + * @return Boot image header sectors count or 0 on error + */ +static lbaint_t fb_mmc_get_boot_header(struct blk_desc *dev_desc, + disk_partition_t *info, + struct andr_img_hdr *hdr, + char *response) +{ + ulong sector_size; /* boot partition sector size */ + lbaint_t hdr_sectors; /* boot image header sectors count */ + int res; + + /* Calculate boot image sectors count */ + sector_size = info->blksz; + hdr_sectors = DIV_ROUND_UP(sizeof(struct andr_img_hdr), sector_size); + if (hdr_sectors == 0) { + pr_err("invalid number of boot sectors: 0\n"); + fastboot_fail("invalid number of boot sectors: 0", response); + return 0; + } + + /* Read the boot image header */ + res = blk_dread(dev_desc, info->start, hdr_sectors, (void *)hdr); + if (res != hdr_sectors) { + pr_err("cannot read header from boot partition\n"); + fastboot_fail("cannot read header from boot partition", + response); + return 0; + } + + /* Check boot header magic string */ + res = android_image_check_header(hdr); + if (res != 0) { + pr_err("bad boot image magic\n"); + fastboot_fail("boot partition not initialized", response); + return 0; + } + + return hdr_sectors; +} + +/** + * Write downloaded zImage to boot partition and repack it properly. + * + * @param dev_desc MMC device descriptor + * @param download_buffer Address to fastboot buffer with zImage in it + * @param download_bytes Size of fastboot buffer, in bytes + * + * @return 0 on success or -1 on error + */ +static int fb_mmc_update_zimage(struct blk_desc *dev_desc, + void *download_buffer, + u32 download_bytes, + char *response) +{ + uintptr_t hdr_addr; /* boot image header address */ + struct andr_img_hdr *hdr; /* boot image header */ + lbaint_t hdr_sectors; /* boot image header sectors */ + u8 *ramdisk_buffer; + u32 ramdisk_sector_start; + u32 ramdisk_sectors; + u32 kernel_sector_start; + u32 kernel_sectors; + u32 sectors_per_page; + disk_partition_t info; + int res; + + puts("Flashing zImage\n"); + + /* Get boot partition info */ + res = part_get_info_by_name(dev_desc, BOOT_PARTITION_NAME, &info); + if (res < 0) { + pr_err("cannot find boot partition\n"); + fastboot_fail("cannot find boot partition", response); + return -1; + } + + /* Put boot image header in fastboot buffer after downloaded zImage */ + hdr_addr = (uintptr_t)download_buffer + ALIGN(download_bytes, PAGE_SIZE); + hdr = (struct andr_img_hdr *)hdr_addr; + + /* Read boot image header */ + hdr_sectors = fb_mmc_get_boot_header(dev_desc, &info, hdr, response); + if (hdr_sectors == 0) { + pr_err("unable to read boot image header\n"); + fastboot_fail("unable to read boot image header", response); + return -1; + } + + /* Check if boot image has second stage in it (we don't support it) */ + if (hdr->second_size > 0) { + pr_err("moving second stage is not supported yet\n"); + fastboot_fail("moving second stage is not supported yet", + response); + return -1; + } + + /* Extract ramdisk location */ + sectors_per_page = hdr->page_size / info.blksz; + ramdisk_sector_start = info.start + sectors_per_page; + ramdisk_sector_start += DIV_ROUND_UP(hdr->kernel_size, hdr->page_size) * + sectors_per_page; + ramdisk_sectors = DIV_ROUND_UP(hdr->ramdisk_size, hdr->page_size) * + sectors_per_page; + + /* Read ramdisk and put it in fastboot buffer after boot image header */ + ramdisk_buffer = (u8 *)hdr + (hdr_sectors * info.blksz); + res = blk_dread(dev_desc, ramdisk_sector_start, ramdisk_sectors, + ramdisk_buffer); + if (res != ramdisk_sectors) { + pr_err("cannot read ramdisk from boot partition\n"); + fastboot_fail("cannot read ramdisk from boot partition", + response); + return -1; + } + + /* Write new kernel size to boot image header */ + hdr->kernel_size = download_bytes; + res = blk_dwrite(dev_desc, info.start, hdr_sectors, (void *)hdr); + if (res == 0) { + pr_err("cannot writeback boot image header\n"); + fastboot_fail("cannot write back boot image header", response); + return -1; + } + + /* Write the new downloaded kernel */ + kernel_sector_start = info.start + sectors_per_page; + kernel_sectors = DIV_ROUND_UP(hdr->kernel_size, hdr->page_size) * + sectors_per_page; + res = blk_dwrite(dev_desc, kernel_sector_start, kernel_sectors, + download_buffer); + if (res == 0) { + pr_err("cannot write new kernel\n"); + fastboot_fail("cannot write new kernel", response); + return -1; + } + + /* Write the saved ramdisk back */ + ramdisk_sector_start = info.start + sectors_per_page; + ramdisk_sector_start += DIV_ROUND_UP(hdr->kernel_size, hdr->page_size) * + sectors_per_page; + res = blk_dwrite(dev_desc, ramdisk_sector_start, ramdisk_sectors, + ramdisk_buffer); + if (res == 0) { + pr_err("cannot write back original ramdisk\n"); + fastboot_fail("cannot write back original ramdisk", response); + return -1; + } + + puts("........ zImage was updated in boot partition\n"); + fastboot_okay(NULL, response); + return 0; +} +#endif + +/** + * fastboot_mmc_get_part_info() - Lookup eMMC partion by name + * + * @part_name: Named partition to lookup + * @dev_desc: Pointer to returned blk_desc pointer + * @part_info: Pointer to returned disk_partition_t + * @response: Pointer to fastboot response buffer + */ +int fastboot_mmc_get_part_info(char *part_name, struct blk_desc **dev_desc, + disk_partition_t *part_info, char *response) +{ + int r; + + *dev_desc = blk_get_dev("mmc", CONFIG_FASTBOOT_FLASH_MMC_DEV); + if (!*dev_desc) { + fastboot_fail("block device not found", response); + return -ENOENT; + } + if (!part_name) { + fastboot_fail("partition not found", response); + return -ENOENT; + } + + r = part_get_info_by_name_or_alias(*dev_desc, part_name, part_info); + if (r < 0) { + fastboot_fail("partition not found", response); + return r; + } + + return r; +} + +/** + * fastboot_mmc_flash_write() - Write image to eMMC for fastboot + * + * @cmd: Named partition to write image to + * @download_buffer: Pointer to image data + * @download_bytes: Size of image data + * @response: Pointer to fastboot response buffer + */ +void fastboot_mmc_flash_write(const char *cmd, void *download_buffer, + u32 download_bytes, char *response) +{ + 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) { + pr_err("invalid mmc device\n"); + fastboot_fail("invalid mmc device", response); + return; + } + +#if CONFIG_IS_ENABLED(EFI_PARTITION) + if (strcmp(cmd, CONFIG_FASTBOOT_GPT_NAME) == 0) { + printf("%s: updating MBR, Primary and Backup GPT(s)\n", + __func__); + if (is_valid_gpt_buf(dev_desc, download_buffer)) { + printf("%s: invalid GPT - refusing to write to flash\n", + __func__); + fastboot_fail("invalid GPT partition", response); + return; + } + if (write_mbr_and_gpt_partitions(dev_desc, download_buffer)) { + printf("%s: writing GPT partitions failed\n", __func__); + fastboot_fail("writing GPT partitions failed", + response); + return; + } + printf("........ success\n"); + fastboot_okay(NULL, response); + return; + } +#endif + +#if CONFIG_IS_ENABLED(DOS_PARTITION) + if (strcmp(cmd, CONFIG_FASTBOOT_MBR_NAME) == 0) { + printf("%s: updating MBR\n", __func__); + if (is_valid_dos_buf(download_buffer)) { + printf("%s: invalid MBR - refusing to write to flash\n", + __func__); + fastboot_fail("invalid MBR partition", response); + return; + } + if (write_mbr_partition(dev_desc, download_buffer)) { + printf("%s: writing MBR partition failed\n", __func__); + fastboot_fail("writing MBR partition failed", + response); + return; + } + printf("........ success\n"); + fastboot_okay(NULL, response); + return; + } +#endif + +#ifdef CONFIG_ANDROID_BOOT_IMAGE + if (strncasecmp(cmd, "zimage", 6) == 0) { + fb_mmc_update_zimage(dev_desc, download_buffer, + download_bytes, response); + return; + } +#endif + + if (part_get_info_by_name_or_alias(dev_desc, cmd, &info) < 0) { + pr_err("cannot find partition: '%s'\n", cmd); + fastboot_fail("cannot find partition", response); + return; + } + + if (is_sparse_image(download_buffer)) { + struct fb_mmc_sparse sparse_priv; + struct sparse_storage sparse; + int err; + + 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; + sparse.mssg = fastboot_fail; + + printf("Flashing sparse image at offset " LBAFU "\n", + sparse.start); + + sparse.priv = &sparse_priv; + err = write_sparse_image(&sparse, cmd, download_buffer, + response); + if (!err) + fastboot_okay(NULL, response); + } else { + write_raw_image(dev_desc, &info, cmd, download_buffer, + download_bytes, response); + } +} + +/** + * fastboot_mmc_flash_erase() - Erase eMMC for fastboot + * + * @cmd: Named partition to erase + * @response: Pointer to fastboot response buffer + */ +void fastboot_mmc_erase(const char *cmd, char *response) +{ + 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) { + pr_err("invalid mmc device\n"); + fastboot_fail("invalid mmc device", response); + return; + } + + dev_desc = blk_get_dev("mmc", CONFIG_FASTBOOT_FLASH_MMC_DEV); + if (!dev_desc || dev_desc->type == DEV_TYPE_UNKNOWN) { + pr_err("invalid mmc device\n"); + fastboot_fail("invalid mmc device", response); + return; + } + + ret = part_get_info_by_name_or_alias(dev_desc, cmd, &info); + if (ret < 0) { + pr_err("cannot find partition: '%s'\n", cmd); + fastboot_fail("cannot find partition", response); + 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\n", + blks_start, blks_start + blks_size); + + blks = fb_mmc_blk_write(dev_desc, blks_start, blks_size, NULL); + + if (blks != blks_size) { + pr_err("failed erasing from device %d\n", dev_desc->devnum); + fastboot_fail("failed erasing from device", response); + return; + } + + printf("........ erased " LBAFU " bytes from '%s'\n", + blks_size * info.blksz, cmd); + fastboot_okay(NULL, response); +} |