diff options
| -rw-r--r-- | arch/mips/bcm47xx/nvram.c | 42 |
1 files changed, 38 insertions, 4 deletions
diff --git a/arch/mips/bcm47xx/nvram.c b/arch/mips/bcm47xx/nvram.c index 21712fb40d72..8b6499100db3 100644 --- a/arch/mips/bcm47xx/nvram.c +++ b/arch/mips/bcm47xx/nvram.c @@ -13,12 +13,10 @@ #include <linux/types.h> #include <linux/module.h> -#include <linux/ssb/ssb.h> #include <linux/kernel.h> #include <linux/string.h> -#include <asm/addrspace.h> +#include <linux/mtd/mtd.h> #include <bcm47xx_nvram.h> -#include <asm/mach-bcm47xx/bcm47xx.h> static char nvram_buf[NVRAM_SPACE]; static const u32 nvram_sizes[] = {0x8000, 0xF000, 0x10000}; @@ -123,7 +121,43 @@ int bcm47xx_nvram_init_from_mem(u32 base, u32 lim) static int nvram_init(void) { - /* TODO: Look for MTD "nvram" partition */ +#ifdef CONFIG_MTD + struct mtd_info *mtd; + struct nvram_header header; + size_t bytes_read; + int err, i; + + mtd = get_mtd_device_nm("nvram"); + if (IS_ERR(mtd)) + return -ENODEV; + + for (i = 0; i < ARRAY_SIZE(nvram_sizes); i++) { + loff_t from = mtd->size - nvram_sizes[i]; + + if (from < 0) + continue; + + err = mtd_read(mtd, from, sizeof(header), &bytes_read, + (uint8_t *)&header); + if (!err && header.magic == NVRAM_HEADER) { + u8 *dst = (uint8_t *)nvram_buf; + size_t len = header.len; + + if (header.len > NVRAM_SPACE) { + pr_err("nvram on flash (%i bytes) is bigger than the reserved space in memory, will just copy the first %i bytes\n", + header.len, NVRAM_SPACE); + len = NVRAM_SPACE; + } + + err = mtd_read(mtd, from, len, &bytes_read, dst); + if (err) + return err; + memset(dst + bytes_read, 0x0, NVRAM_SPACE - bytes_read); + + return 0; + } + } +#endif return -ENXIO; } |