1 files changed, 118 insertions, 41 deletions

diff --git a/arch/mips/bcm47xx/nvram.c b/arch/mips/bcm47xx/nvram.c
index c37419c11c92..cc40b74940f5 100644
--- a/arch/mips/bcm47xx/nvram.c
+++ b/arch/mips/bcm47xx/nvram.c
@@ -3,7 +3,7 @@
  *
  * 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
@@ -18,83 +18,160 @@
 #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)];
@@ -110,6 +187,6 @@ int nvram_getenv(char *name, char *val, size_t val_len)
                         return snprintf(val, val_len, "%s", value);
                 }
         }
-        return NVRAM_ERR_ENVNOTFOUND;
+        return -ENOENT;
 }
-EXPORT_SYMBOL(nvram_getenv);
+EXPORT_SYMBOL(bcm47xx_nvram_getenv);