diff options
Diffstat (limited to 'arch/mips/bcm47xx/nvram.c')
| -rw-r--r-- | arch/mips/bcm47xx/nvram.c | 155 |
1 files changed, 86 insertions, 69 deletions
diff --git a/arch/mips/bcm47xx/nvram.c b/arch/mips/bcm47xx/nvram.c index 2bed73a684ae..c5c381c43f17 100644 --- a/arch/mips/bcm47xx/nvram.c +++ b/arch/mips/bcm47xx/nvram.c @@ -13,24 +13,35 @@ #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> + +#define NVRAM_MAGIC 0x48534C46 /* 'FLSH' */ +#define NVRAM_SPACE 0x8000 + +#define FLASH_MIN 0x00020000 /* Minimum flash size */ + +struct nvram_header { + u32 magic; + u32 len; + u32 crc_ver_init; /* 0:7 crc, 8:15 ver, 16:31 sdram_init */ + u32 config_refresh; /* 0:15 sdram_config, 16:31 sdram_refresh */ + u32 config_ncdl; /* ncdl values for memc */ +}; static char nvram_buf[NVRAM_SPACE]; static const u32 nvram_sizes[] = {0x8000, 0xF000, 0x10000}; -static u32 find_nvram_size(u32 end) +static u32 find_nvram_size(void __iomem *end) { - struct nvram_header *header; + struct nvram_header __iomem *header; int i; for (i = 0; i < ARRAY_SIZE(nvram_sizes); i++) { - header = (struct nvram_header *)KSEG1ADDR(end - nvram_sizes[i]); - if (header->magic == NVRAM_HEADER) + header = (struct nvram_header *)(end - nvram_sizes[i]); + if (header->magic == NVRAM_MAGIC) return nvram_sizes[i]; } @@ -38,36 +49,40 @@ static u32 find_nvram_size(u32 end) } /* Probe for NVRAM header */ -static int nvram_find_and_copy(u32 base, u32 lim) +static int nvram_find_and_copy(void __iomem *iobase, u32 lim) { - struct nvram_header *header; + struct nvram_header __iomem *header; int i; u32 off; u32 *src, *dst; u32 size; + if (nvram_buf[0]) { + pr_warn("nvram already initialized\n"); + return -EEXIST; + } + /* TODO: when nvram is on nand flash check for bad blocks first. */ off = FLASH_MIN; while (off <= lim) { /* Windowed flash access */ - size = find_nvram_size(base + off); + size = find_nvram_size(iobase + off); if (size) { - header = (struct nvram_header *)KSEG1ADDR(base + off - - size); + header = (struct nvram_header *)(iobase + off - size); goto found; } off <<= 1; } /* Try embedded NVRAM at 4 KB and 1 KB as last resorts */ - header = (struct nvram_header *) KSEG1ADDR(base + 4096); - if (header->magic == NVRAM_HEADER) { + header = (struct nvram_header *)(iobase + 4096); + if (header->magic == NVRAM_MAGIC) { size = NVRAM_SPACE; goto found; } - header = (struct nvram_header *) KSEG1ADDR(base + 1024); - if (header->magic == NVRAM_HEADER) { + header = (struct nvram_header *)(iobase + 1024); + if (header->magic == NVRAM_MAGIC) { size = NVRAM_SPACE; goto found; } @@ -94,71 +109,73 @@ found: return 0; } -#ifdef CONFIG_BCM47XX_SSB -static int nvram_init_ssb(void) +/* + * On bcm47xx we need access to the NVRAM very early, so we can't use mtd + * subsystem to access flash. We can't even use platform device / driver to + * store memory offset. + * To handle this we provide following symbol. It's supposed to be called as + * soon as we get info about flash device, before any NVRAM entry is needed. + */ +int bcm47xx_nvram_init_from_mem(u32 base, u32 lim) { - struct ssb_mipscore *mcore = &bcm47xx_bus.ssb.mipscore; - u32 base; - u32 lim; - - if (mcore->pflash.present) { - base = mcore->pflash.window; - lim = mcore->pflash.window_size; - } else { - pr_err("Couldn't find supported flash memory\n"); - return -ENXIO; - } + void __iomem *iobase; + int err; - return nvram_find_and_copy(base, lim); -} -#endif + iobase = ioremap_nocache(base, lim); + if (!iobase) + return -ENOMEM; -#ifdef CONFIG_BCM47XX_BCMA -static int nvram_init_bcma(void) -{ - struct bcma_drv_cc *cc = &bcm47xx_bus.bcma.bus.drv_cc; - u32 base; - u32 lim; - -#ifdef CONFIG_BCMA_NFLASH - if (cc->nflash.boot) { - base = BCMA_SOC_FLASH1; - lim = BCMA_SOC_FLASH1_SZ; - } else -#endif - if (cc->pflash.present) { - base = cc->pflash.window; - lim = cc->pflash.window_size; -#ifdef CONFIG_BCMA_SFLASH - } else if (cc->sflash.present) { - base = cc->sflash.window; - lim = cc->sflash.size; -#endif - } else { - pr_err("Couldn't find supported flash memory\n"); - return -ENXIO; - } + err = nvram_find_and_copy(iobase, lim); + + iounmap(iobase); - return nvram_find_and_copy(base, lim); + return err; } -#endif static int nvram_init(void) { - switch (bcm47xx_bus_type) { -#ifdef CONFIG_BCM47XX_SSB - case BCM47XX_BUS_TYPE_SSB: - return nvram_init_ssb(); -#endif -#ifdef CONFIG_BCM47XX_BCMA - case BCM47XX_BUS_TYPE_BCMA: - return nvram_init_bcma(); -#endif +#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_MAGIC) { + 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; } -int bcm47xx_nvram_getenv(char *name, char *val, size_t val_len) +int bcm47xx_nvram_getenv(const char *name, char *val, size_t val_len) { char *var, *value, *end, *eq; int err; |