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kernel: mtdsplit: bcm_wfi: support Sercomm bootflags

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Sercomm uses 2 bootflag partitions and boots the firmware with the highest
bootflag. Support splitting the firmware partition while keeping support for
unsplitted layout.

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
This commit is contained in:
Álvaro Fernández Rojas 2020-06-02 08:57:38 +02:00
parent cd81d105d5
commit fce7380e0e
1 changed files with 148 additions and 0 deletions
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148
target/linux/generic/files/drivers/mtd/mtdsplit/mtdsplit_bcm_wfi.c
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@ -24,6 +24,8 @@
#include "mtdsplit.h"
#define char_to_num(c) ((c >= '0' && c <= '9') ? (c - '0') : (0))
#define BCM_WFI_PARTS 3
#define CFERAM_NAME "cferam"
@ -35,6 +37,11 @@
#define UBI_MAGIC 0x55424923
#define SERCOMM_MAGIC_PFX "eRcOmM."
#define SERCOMM_MAGIC_PFX_LEN (sizeof(SERCOMM_MAGIC_PFX) - 1)
#define SERCOMM_MAGIC "eRcOmM.000"
#define SERCOMM_MAGIC_LEN (sizeof(SERCOMM_MAGIC) - 1)
static u32 jffs2_dirent_crc(struct jffs2_raw_dirent *node)
{
return crc32(0, node, sizeof(struct jffs2_raw_dirent) - 8);
@ -220,9 +227,150 @@ static struct mtd_part_parser mtdsplit_bcm_wfi_parser = {
.type = MTD_PARSER_TYPE_FIRMWARE,
};
static int sercomm_bootflag_value(struct mtd_info *mtd, uint8_t *buf)
{
size_t retlen;
loff_t offs;
int rc;
for (offs = 0; offs < mtd->size; offs += mtd->erasesize) {
rc = mtd_read(mtd, offs, SERCOMM_MAGIC_LEN, &retlen, buf);
if (rc || retlen != SERCOMM_MAGIC_LEN)
continue;
if (memcmp(buf, SERCOMM_MAGIC_PFX, SERCOMM_MAGIC_PFX_LEN))
continue;
rc = char_to_num(buf[SERCOMM_MAGIC_PFX_LEN + 0]) * 100;
rc += char_to_num(buf[SERCOMM_MAGIC_PFX_LEN + 1]) * 10;
rc += char_to_num(buf[SERCOMM_MAGIC_PFX_LEN + 2]) * 1;
return rc;
}
return -ENOENT;
}
static int mtdsplit_parse_ser_wfi(struct mtd_info *master,
const struct mtd_partition **pparts,
struct mtd_part_parser_data *data)
{
struct mtd_info *mtd_bf1, *mtd_bf2;
struct erase_info bf_erase;
struct mtd_partition *parts;
loff_t kernel_off, rootfs_off, img_size;
loff_t img2_off, img2_size = 0;
unsigned int num_parts = BCM_WFI_PARTS, cur_part = 0;
uint8_t *buf;
int bf1, bf2;
int ret;
mtd_bf1 = get_mtd_device_nm("bootflag1");
if (IS_ERR(mtd_bf1))
return -ENOENT;
mtd_bf2 = get_mtd_device_nm("bootflag2");
if (IS_ERR(mtd_bf2))
return -ENOENT;
buf = kzalloc(master->erasesize, GFP_KERNEL);
if (!buf)
return -ENOMEM;
bf1 = sercomm_bootflag_value(mtd_bf1, buf);
if (bf1 >= 0)
printk("sercomm: bootflag1=%d\n", bf1);
bf2 = sercomm_bootflag_value(mtd_bf2, buf);
if (bf2 >= 0)
printk("sercomm: bootflag2=%d\n", bf2);
if (bf1 == bf2 && bf2 >= 0) {
bf2 = -ENOENT;
bf_erase.addr = 0;
bf_erase.len = mtd_bf2->size;
mtd_erase(mtd_bf2, &bf_erase);
}
if (bf1 >= bf2) {
kernel_off = 0;
if (bf2 >= 0) {
img_size = master->size / 2;
img2_off = img_size;
img2_size = master->size - img2_off;
num_parts++;
} else {
img_size = master->size;
}
} else {
kernel_off = master->size / 2;
img_size = master->size;
img2_off = 0;
img2_size = kernel_off;
num_parts++;
}
ret = jffs2_find_file(master, buf, KERNEL_NAME, KERNEL_NAME_LEN,
&kernel_off, img_size);
kfree(buf);
if (ret)
return ret;
rootfs_off = kernel_off + master->erasesize;
ret = ubifs_find(master, &rootfs_off, img_size);
if (ret)
return ret;
parts = kzalloc(num_parts * sizeof(*parts), GFP_KERNEL);
if (!parts)
return -ENOMEM;
parts[cur_part].name = "firmware";
parts[cur_part].offset = kernel_off;
parts[cur_part].size = img_size - kernel_off;
cur_part++;
parts[cur_part].name = KERNEL_PART_NAME;
parts[cur_part].offset = kernel_off;
parts[cur_part].size = rootfs_off - kernel_off;
cur_part++;
parts[cur_part].name = UBI_PART_NAME;
parts[cur_part].offset = rootfs_off;
parts[cur_part].size = img_size - rootfs_off;
cur_part++;
if (img2_size) {
parts[cur_part].name = "img2";
parts[cur_part].offset = img2_off;
parts[cur_part].size = img2_size;
cur_part++;
}
*pparts = parts;
return num_parts;
}
static const struct of_device_id mtdsplit_ser_wfi_of_match[] = {
{ .compatible = "sercomm,wfi" },
{ },
};
static struct mtd_part_parser mtdsplit_ser_wfi_parser = {
.owner = THIS_MODULE,
.name = "ser-wfi-fw",
.of_match_table = mtdsplit_ser_wfi_of_match,
.parse_fn = mtdsplit_parse_ser_wfi,
.type = MTD_PARSER_TYPE_FIRMWARE,
};
static int __init mtdsplit_bcm_wfi_init(void)
{
register_mtd_parser(&mtdsplit_bcm_wfi_parser);
register_mtd_parser(&mtdsplit_ser_wfi_parser);
return 0;
}