add initial 2.6.28 support for brcm47xx target

[openwrt/svn-archive/archive.git] / target / linux / brcm47xx / files-2.6.28 / arch / mips / bcm47xx / nvram.c

diff --git a/target/linux/brcm47xx/files-2.6.28/arch/mips/bcm47xx/nvram.c b/target/linux/brcm47xx/files-2.6.28/arch/mips/bcm47xx/nvram.c
new file mode 100644 (file)
index 0000000..3f32ad9
--- /dev/null
+++ b/target/linux/brcm47xx/files-2.6.28/arch/mips/bcm47xx/nvram.c
@@ -0,0 +1,125 @@
+/*
+ * BCM947xx nvram variable access
+ *
+ * Copyright 2005, Broadcom Corporation
+ * Copyright 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/module.h>
+#include <linux/ssb/ssb.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/interrupt.h>
+#include <linux/spinlock.h>
+#include <linux/slab.h>
+#include <asm/byteorder.h>
+#include <asm/bootinfo.h>
+#include <asm/addrspace.h>
+#include <asm/io.h>
+#include <asm/uaccess.h>
+
+#include <nvram.h>
+
+#define MB * 1048576
+extern struct ssb_bus ssb;
+
+static char nvram_buf[NVRAM_SPACE];
+static int cfe_env;
+extern char *cfe_env_get(char *nv_buf, const char *name);
+               
+/* Probe for NVRAM header */
+static void __init early_nvram_init(void)
+{
+       struct ssb_mipscore *mcore = &ssb.mipscore;
+       struct nvram_header *header;
+       int i;
+       u32 base, lim, off;
+       u32 *src, *dst;
+       
+       base = mcore->flash_window;
+       lim = mcore->flash_window_size;
+       cfe_env = 0;
+
+       
+       /* XXX: hack for supporting the CFE environment stuff on WGT634U */
+       if (lim >= 8 MB) {
+               src = (u32 *) KSEG1ADDR(base + 8 MB - 0x2000);
+               dst = (u32 *) nvram_buf;
+
+               if ((*src & 0xff00ff) == 0x000001) {
+                       printk("early_nvram_init: WGT634U NVRAM found.\n");
+
+                       for (i = 0; i < 0x1ff0; i++) {
+                               if (*src == 0xFFFFFFFF)
+                                       break;
+                               *dst++ = *src++;
+                       }
+                       cfe_env = 1;
+                       return;
+               }
+       }
+
+       off = 0x20000;
+       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++);
+}
+
+char *nvram_get(const char *name)
+{
+       char *var, *value, *end, *eq;
+
+       if (!name)
+               return NULL;
+
+       if (!nvram_buf[0])
+               early_nvram_init();
+
+       if (cfe_env)
+               return cfe_env_get(nvram_buf, name);
+
+       /* 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) {
+               if (!(eq = strchr(var, '=')))
+                       break;
+               value = eq + 1;
+               if ((eq - var) == strlen(name) && strncmp(var, name, (eq - var)) == 0)
+                       return value;
+       }
+
+       return NULL;
+}
+
+EXPORT_SYMBOL(nvram_get);