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Diffstat (limited to 'arch/mips/bcm47xx/nvram.c')
-rw-r--r--arch/mips/bcm47xx/nvram.c155
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;