1 files changed, 107 insertions, 0 deletions

diff --git a/arch/mips/bcm63xx/nvram.c b/arch/mips/bcm63xx/nvram.c
new file mode 100644
index 000000000000..620611680839
--- /dev/null
+++ b/arch/mips/bcm63xx/nvram.c
@@ -0,0 +1,107 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2008 Maxime Bizon <mbizon@freebox.fr>
+ * Copyright (C) 2008 Florian Fainelli <florian@openwrt.org>
+ * Copyright (C) 2012 Jonas Gorski <jonas.gorski@gmail.com>
+ */
+
+#define pr_fmt(fmt) "bcm63xx_nvram: " fmt
+
+#include <linux/init.h>
+#include <linux/crc32.h>
+#include <linux/export.h>
+#include <linux/kernel.h>
+#include <linux/if_ether.h>
+
+#include <bcm63xx_nvram.h>
+
+/*
+ * nvram structure
+ */
+struct bcm963xx_nvram {
+        u32     version;
+        u8      reserved1[256];
+        u8      name[16];
+        u32     main_tp_number;
+        u32     psi_size;
+        u32     mac_addr_count;
+        u8      mac_addr_base[ETH_ALEN];
+        u8      reserved2[2];
+        u32     checksum_old;
+        u8      reserved3[720];
+        u32     checksum_high;
+};
+
+static struct bcm963xx_nvram nvram;
+static int mac_addr_used;
+
+int __init bcm63xx_nvram_init(void *addr)
+{
+        unsigned int check_len;
+        u32 crc, expected_crc;
+
+        /* extract nvram data */
+        memcpy(&nvram, addr, sizeof(nvram));
+
+        /* check checksum before using data */
+        if (nvram.version <= 4) {
+                check_len = offsetof(struct bcm963xx_nvram, reserved3);
+                expected_crc = nvram.checksum_old;
+                nvram.checksum_old = 0;
+        } else {
+                check_len = sizeof(nvram);
+                expected_crc = nvram.checksum_high;
+                nvram.checksum_high = 0;
+        }
+
+        crc = crc32_le(~0, (u8 *)&nvram, check_len);
+
+        if (crc != expected_crc)
+                return -EINVAL;
+
+        return 0;
+}
+
+u8 *bcm63xx_nvram_get_name(void)
+{
+        return nvram.name;
+}
+EXPORT_SYMBOL(bcm63xx_nvram_get_name);
+
+int bcm63xx_nvram_get_mac_address(u8 *mac)
+{
+        u8 *oui;
+        int count;
+
+        if (mac_addr_used >= nvram.mac_addr_count) {
+                pr_err("not enough mac addresses\n");
+                return -ENODEV;
+        }
+
+        memcpy(mac, nvram.mac_addr_base, ETH_ALEN);
+        oui = mac + ETH_ALEN/2 - 1;
+        count = mac_addr_used;
+
+        while (count--) {
+                u8 *p = mac + ETH_ALEN - 1;
+
+                do {
+                        (*p)++;
+                        if (*p != 0)
+                                break;
+                        p--;
+                } while (p != oui);
+
+                if (p == oui) {
+                        pr_err("unable to fetch mac address\n");
+                        return -ENODEV;
+                }
+        }
+
+        mac_addr_used++;
+        return 0;
+}
+EXPORT_SYMBOL(bcm63xx_nvram_get_mac_address);