1 files changed, 94 insertions, 0 deletions

diff --git a/arch/mips/bcm47xx/nvram.c b/arch/mips/bcm47xx/nvram.c
new file mode 100644
index 000000000000..06e03b222f6d
--- /dev/null
+++ b/arch/mips/bcm47xx/nvram.c
@@ -0,0 +1,94 @@
+/*
+ * BCM947xx nvram variable access
+ *
+ * Copyright (C) 2005 Broadcom Corporation
+ * Copyright (C) 2006 Felix Fietkau <nbd@openwrt.org>
+ *
+ * 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/init.h>
+#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 <asm/mach-bcm47xx/nvram.h>
+#include <asm/mach-bcm47xx/bcm47xx.h>
+
+static char nvram_buf[NVRAM_SPACE];
+
+/* Probe for NVRAM header */
+static void __init early_nvram_init(void)
+{
+        struct ssb_mipscore *mcore = &ssb_bcm47xx.mipscore;
+        struct nvram_header *header;
+        int i;
+        u32 base, lim, off;
+        u32 *src, *dst;
+
+        base = mcore->flash_window;
+        lim = mcore->flash_window_size;
+
+        off = FLASH_MIN;
+        while (off <= lim) {
+                /* Windowed flash access */
+                header = (struct nvram_header *)
+                        KSEG1ADDR(base + off - NVRAM_SPACE);
+                if (header->magic == NVRAM_HEADER)
+                        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)
+                goto found;
+
+        header = (struct nvram_header *) KSEG1ADDR(base + 1024);
+        if (header->magic == NVRAM_HEADER)
+                goto found;
+
+        return;
+
+found:
+        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)
+                *dst++ = le32_to_cpu(*src++);
+}
+
+int nvram_getenv(char *name, char *val, size_t val_len)
+{
+        char *var, *value, *end, *eq;
+
+        if (!name)
+                return 1;
+
+        if (!nvram_buf[0])
+                early_nvram_init();
+
+        /* Look for name=value and return value */
+        var = &nvram_buf[sizeof(struct nvram_header)];
+        end = nvram_buf + sizeof(nvram_buf) - 2;
+        end[0] = end[1] = '\0';
+        for (; *var; var = value + strlen(value) + 1) {
+                eq = strchr(var, '=');
+                if (!eq)
+                        break;
+                value = eq + 1;
+                if ((eq - var) == strlen(name) &&
+                        strncmp(var, name, (eq - var)) == 0) {
+                        snprintf(val, val_len, "%s", value);
+                        return 0;
+                }
+        }
+        return 1;
+}
+EXPORT_SYMBOL(nvram_getenv);