*
* Copyright (C) 2005 Broadcom Corporation
* Copyright (C) 2006 Felix Fietkau <nbd@openwrt.org>
- * Copyright (C) 2010-2011 Hauke Mehrtens <hauke@hauke-m.de>
+ * Copyright (C) 2010-2012 Hauke Mehrtens <hauke@hauke-m.de>
*
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*/
#include <linux/kernel.h>
#include <linux/string.h>
#include <asm/addrspace.h>
-#include <asm/mach-bcm47xx/nvram.h>
+#include <bcm47xx_nvram.h>
#include <asm/mach-bcm47xx/bcm47xx.h>
static char nvram_buf[NVRAM_SPACE];
+static u32 find_nvram_size(u32 end)
+{
+ struct nvram_header *header;
+ u32 nvram_sizes[] = {0x8000, 0xF000, 0x10000};
+ 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)
+ return nvram_sizes[i];
+ }
+
+ return 0;
+}
+
/* Probe for NVRAM header */
-static void early_nvram_init(void)
+static int nvram_find_and_copy(u32 base, u32 lim)
{
-#ifdef CONFIG_BCM47XX_SSB
- struct ssb_mipscore *mcore_ssb;
-#endif
-#ifdef CONFIG_BCM47XX_BCMA
- struct bcma_drv_cc *bcma_cc;
-#endif
struct nvram_header *header;
int i;
- u32 base = 0;
- u32 lim = 0;
u32 off;
u32 *src, *dst;
+ u32 size;
- switch (bcm47xx_bus_type) {
-#ifdef CONFIG_BCM47XX_SSB
- case BCM47XX_BUS_TYPE_SSB:
- mcore_ssb = &bcm47xx_bus.ssb.mipscore;
- base = mcore_ssb->pflash.window;
- lim = mcore_ssb->pflash.window_size;
- break;
-#endif
-#ifdef CONFIG_BCM47XX_BCMA
- case BCM47XX_BUS_TYPE_BCMA:
- bcma_cc = &bcm47xx_bus.bcma.bus.drv_cc;
- base = bcma_cc->pflash.window;
- lim = bcma_cc->pflash.window_size;
- break;
-#endif
- }
-
+ /* TODO: when nvram is on nand flash check for bad blocks first. */
off = FLASH_MIN;
while (off <= lim) {
/* Windowed flash access */
- header = (struct nvram_header *)
- KSEG1ADDR(base + off - NVRAM_SPACE);
- if (header->magic == NVRAM_HEADER)
+ size = find_nvram_size(base + off);
+ if (size) {
+ header = (struct nvram_header *)KSEG1ADDR(base + 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)
+ if (header->magic == NVRAM_HEADER) {
+ size = NVRAM_SPACE;
goto found;
+ }
header = (struct nvram_header *) KSEG1ADDR(base + 1024);
- if (header->magic == NVRAM_HEADER)
+ if (header->magic == NVRAM_HEADER) {
+ size = NVRAM_SPACE;
goto found;
+ }
- return;
+ pr_err("no nvram found\n");
+ return -ENXIO;
found:
+
+ if (header->len > size)
+ pr_err("The nvram size accoridng to the header seems to be bigger than the partition on flash\n");
+ 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);
+
src = (u32 *) header;
dst = (u32 *) nvram_buf;
for (i = 0; i < sizeof(struct nvram_header); i += 4)
*dst++ = *src++;
- for (; i < header->len && i < NVRAM_SPACE; i += 4)
+ for (; i < header->len && i < NVRAM_SPACE && i < size; i += 4)
*dst++ = le32_to_cpu(*src++);
+ memset(dst, 0x0, NVRAM_SPACE - i);
+
+ return 0;
}
-int nvram_getenv(char *name, char *val, size_t val_len)
+#ifdef CONFIG_BCM47XX_SSB
+static int nvram_init_ssb(void)
+{
+ 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;
+ }
+
+ return nvram_find_and_copy(base, lim);
+}
+#endif
+
+#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;
+ }
+
+ return nvram_find_and_copy(base, lim);
+}
+#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
+ }
+ return -ENXIO;
+}
+
+int bcm47xx_nvram_getenv(char *name, char *val, size_t val_len)
{
char *var, *value, *end, *eq;
+ int err;
if (!name)
- return NVRAM_ERR_INV_PARAM;
+ return -EINVAL;
- if (!nvram_buf[0])
- early_nvram_init();
+ if (!nvram_buf[0]) {
+ err = nvram_init();
+ if (err)
+ return err;
+ }
/* Look for name=value and return value */
var = &nvram_buf[sizeof(struct nvram_header)];
return snprintf(val, val_len, "%s", value);
}
}
- return NVRAM_ERR_ENVNOTFOUND;
+ return -ENOENT;
}
-EXPORT_SYMBOL(nvram_getenv);
+EXPORT_SYMBOL(bcm47xx_nvram_getenv);
projects / ~andy / linux / blobdiff