u-boot/drivers/fastboot/fb_mmc.c

705 lines
19 KiB
C
Raw Normal View History

// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright 2014 Broadcom Corporation.
*/
#include <config.h>
#include <common.h>
#include <blk.h>
#include <env.h>
#include <fastboot.h>
#include <fastboot-internal.h>
#include <fb_mmc.h>
#include <flash.h>
#include <image-sparse.h>
#include <image.h>
#include <log.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 raw_part_get_info_by_name(struct blk_desc *dev_desc,
const char *name,
struct disk_partition *info)
{
/* strlen("fastboot_raw_partition_") + PART_NAME_LEN + 1 */
char env_desc_name[23 + PART_NAME_LEN + 1];
char *raw_part_desc;
const char *argv[2];
const char **parg = argv;
/* check for raw partition descriptor */
strcpy(env_desc_name, "fastboot_raw_partition_");
strlcat(env_desc_name, name, PART_NAME_LEN);
raw_part_desc = strdup(env_get(env_desc_name));
if (raw_part_desc == NULL)
return -ENODEV;
/*
* parse partition descriptor
*
* <lba_start> <lba_size> [mmcpart <num>]
*/
for (; parg < argv + sizeof(argv) / sizeof(*argv); ++parg) {
*parg = strsep(&raw_part_desc, " ");
if (*parg == NULL) {
pr_err("Invalid number of arguments.\n");
return -ENODEV;
}
}
info->start = simple_strtoul(argv[0], NULL, 0);
info->size = simple_strtoul(argv[1], NULL, 0);
info->blksz = dev_desc->blksz;
strlcpy((char *)info->name, name, PART_NAME_LEN);
if (raw_part_desc) {
if (strcmp(strsep(&raw_part_desc, " "), "mmcpart") == 0) {
ulong mmcpart = simple_strtoul(raw_part_desc, NULL, 0);
int ret = blk_dselect_hwpart(dev_desc, mmcpart);
if (ret)
return ret;
}
}
return 0;
}
static int do_get_part_info(struct blk_desc **dev_desc, const char *name,
struct disk_partition *info)
{
int ret;
/* First try partition names on the default device */
*dev_desc = blk_get_dev("mmc", CONFIG_FASTBOOT_FLASH_MMC_DEV);
if (*dev_desc) {
ret = part_get_info_by_name(*dev_desc, name, info);
if (ret >= 0)
return ret;
/* Then try raw partitions */
ret = raw_part_get_info_by_name(*dev_desc, name, info);
if (ret >= 0)
return ret;
}
/* Then try dev.hwpart:part */
ret = part_get_info_by_dev_and_name_or_num("mmc", name, dev_desc,
info, true);
return ret;
}
static int part_get_info_by_name_or_alias(struct blk_desc **dev_desc,
const char *name,
struct disk_partition *info)
{
int ret;
ret = do_get_part_info(dev_desc, name, info);
if (ret < 0) {
/* strlen("fastboot_partition_alias_") + PART_NAME_LEN + 1 */
char env_alias_name[25 + PART_NAME_LEN + 1];
char *aliased_part_name;
/* check for alias */
strcpy(env_alias_name, "fastboot_partition_alias_");
strlcat(env_alias_name, name, PART_NAME_LEN);
aliased_part_name = env_get(env_alias_name);
if (aliased_part_name != NULL)
ret = do_get_part_info(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,
struct disk_partition *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);
}
#if defined(CONFIG_FASTBOOT_MMC_BOOT_SUPPORT) || \
defined(CONFIG_FASTBOOT_MMC_USER_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;
}
#endif
#ifdef CONFIG_FASTBOOT_MMC_BOOT_SUPPORT
static void fb_mmc_boot_ops(struct blk_desc *dev_desc, void *buffer,
int hwpart, u32 buff_sz, char *response)
{
lbaint_t blkcnt;
lbaint_t blks;
unsigned long blksz;
// To operate on EMMC_BOOT1/2 (mmc0boot0/1) we first change the hwpart
if (blk_dselect_hwpart(dev_desc, hwpart)) {
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_BOOT%d...\n", hwpart);
blks = fb_mmc_blk_write(dev_desc, 0, blkcnt, buffer);
if (blks != blkcnt) {
pr_err("Failed to write EMMC_BOOT%d\n", hwpart);
fastboot_fail("Failed to write EMMC_BOOT part",
response);
return;
}
printf("........ wrote %lu bytes to EMMC_BOOT%d\n",
blkcnt * blksz, hwpart);
} else { /* erase */
if (fb_mmc_erase_mmc_hwpart(dev_desc)) {
pr_err("Failed to erase EMMC_BOOT%d\n", hwpart);
fastboot_fail("Failed to erase EMMC_BOOT part",
response);
return;
}
}
fastboot_okay(NULL, response);
}
#endif
#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,
struct disk_partition *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;
struct disk_partition 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 struct disk_partition
* @response: Pointer to fastboot response buffer
*/
int fastboot_mmc_get_part_info(const char *part_name,
struct blk_desc **dev_desc,
struct disk_partition *part_info, char *response)
{
int ret;
if (!part_name || !strcmp(part_name, "")) {
fastboot_fail("partition not given", response);
return -ENOENT;
}
ret = part_get_info_by_name_or_alias(dev_desc, part_name, part_info);
if (ret < 0) {
switch (ret) {
case -ENOSYS:
case -EINVAL:
fastboot_fail("invalid partition or device", response);
break;
case -ENODEV:
fastboot_fail("no such device", response);
break;
case -ENOENT:
fastboot_fail("no such partition", response);
break;
case -EPROTONOSUPPORT:
fastboot_fail("unknown partition table type", response);
break;
default:
fastboot_fail("unanticipated error", response);
break;
}
}
return ret;
}
static struct blk_desc *fastboot_mmc_get_dev(char *response)
{
struct blk_desc *ret = blk_get_dev("mmc",
CONFIG_FASTBOOT_FLASH_MMC_DEV);
if (!ret || ret->type == DEV_TYPE_UNKNOWN) {
pr_err("invalid mmc device\n");
fastboot_fail("invalid mmc device", response);
return NULL;
}
return ret;
}
/**
* 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;
struct disk_partition info;
#ifdef CONFIG_FASTBOOT_MMC_BOOT_SUPPORT
if (strcmp(cmd, CONFIG_FASTBOOT_MMC_BOOT1_NAME) == 0) {
dev_desc = fastboot_mmc_get_dev(response);
if (dev_desc)
fb_mmc_boot_ops(dev_desc, download_buffer, 1,
download_bytes, response);
return;
}
if (strcmp(cmd, CONFIG_FASTBOOT_MMC_BOOT2_NAME) == 0) {
dev_desc = fastboot_mmc_get_dev(response);
if (dev_desc)
fb_mmc_boot_ops(dev_desc, download_buffer, 1,
download_bytes, response);
return;
}
#endif
#if CONFIG_IS_ENABLED(EFI_PARTITION)
#ifndef CONFIG_FASTBOOT_MMC_USER_SUPPORT
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
dev_desc = fastboot_mmc_get_dev(response);
if (!dev_desc)
return;
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;
}
part_init(dev_desc);
printf("........ success\n");
fastboot_okay(NULL, response);
return;
}
#endif
#if CONFIG_IS_ENABLED(DOS_PARTITION)
if (strcmp(cmd, CONFIG_FASTBOOT_MBR_NAME) == 0) {
dev_desc = fastboot_mmc_get_dev(response);
if (!dev_desc)
return;
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_sector(dev_desc, download_buffer)) {
printf("%s: writing MBR partition failed\n", __func__);
fastboot_fail("writing MBR partition failed",
response);
return;
}
part_init(dev_desc);
printf("........ success\n");
fastboot_okay(NULL, response);
return;
}
#endif
#ifdef CONFIG_ANDROID_BOOT_IMAGE
if (strncasecmp(cmd, "zimage", 6) == 0) {
dev_desc = fastboot_mmc_get_dev(response);
if (dev_desc)
fb_mmc_update_zimage(dev_desc, download_buffer,
download_bytes, response);
return;
}
#endif
if (fastboot_mmc_get_part_info(cmd, &dev_desc, &info, response) < 0)
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)
{
struct blk_desc *dev_desc;
struct disk_partition info;
lbaint_t blks, blks_start, blks_size, grp_size;
struct mmc *mmc = find_mmc_device(CONFIG_FASTBOOT_FLASH_MMC_DEV);
#ifdef CONFIG_FASTBOOT_MMC_BOOT_SUPPORT
if (strcmp(cmd, CONFIG_FASTBOOT_MMC_BOOT1_NAME) == 0) {
/* erase EMMC boot1 */
dev_desc = fastboot_mmc_get_dev(response);
if (dev_desc)
fb_mmc_boot_ops(dev_desc, NULL, 1, 0, response);
return;
}
if (strcmp(cmd, CONFIG_FASTBOOT_MMC_BOOT2_NAME) == 0) {
/* erase EMMC boot2 */
dev_desc = fastboot_mmc_get_dev(response);
if (dev_desc)
fb_mmc_boot_ops(dev_desc, NULL, 1, 0, response);
return;
}
#endif
#ifdef CONFIG_FASTBOOT_MMC_USER_SUPPORT
if (strcmp(cmd, CONFIG_FASTBOOT_MMC_USER_NAME) == 0) {
/* erase EMMC userdata */
dev_desc = fastboot_mmc_get_dev(response);
if (!dev_desc)
return;
if (fb_mmc_erase_mmc_hwpart(dev_desc))
fastboot_fail("Failed to erase EMMC_USER", response);
else
fastboot_okay(NULL, response);
return;
}
#endif
if (fastboot_mmc_get_part_info(cmd, &dev_desc, &info, response) < 0)
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);
}