From 1d693b2c9d5943cbe938f879041b837cd004737f Mon Sep 17 00:00:00 2001
From: Hauke Mehrtens <hauke@hauke-m.de>
Date: Sat, 23 Jul 2011 18:29:38 +0200
Subject: [PATCH 25/26] bcm47xx: read nvram from sflash

bcm47xx: add sflash support to nvram

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
---
 arch/mips/bcm47xx/nvram.c |   86 +++++++++++++++++++++++++++++++++++++++++++-
 1 files changed, 84 insertions(+), 2 deletions(-)

--- a/arch/mips/bcm47xx/nvram.c
+++ b/arch/mips/bcm47xx/nvram.c
@@ -20,11 +20,12 @@
 #include <asm/addrspace.h>
 #include <asm/mach-bcm47xx/nvram.h>
 #include <asm/mach-bcm47xx/bcm47xx.h>
+#include <asm/mach-bcm47xx/bus.h>
 
 static char nvram_buf[NVRAM_SPACE];
 
 /* Probe for NVRAM header */
-static void early_nvram_init(void)
+static void early_nvram_init_pflash(void)
 {
 #ifdef CONFIG_BCM47XX_SSB
 	struct ssb_chipcommon *ssb_cc;
@@ -86,7 +87,88 @@ found:
 	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++);
+		*dst++ = *src++;
+}
+
+static int early_nvram_init_sflash(void)
+{
+	struct nvram_header header;
+	u32 off;
+	int ret;
+	char *dst;
+	int len;
+
+	/* check if the struct is already initilized */
+	if (!bcm47xx_sflash.size)
+		return -1;
+
+	off = FLASH_MIN;
+	while (off <= bcm47xx_sflash.size) {
+		ret = bcm47xx_sflash.read(&bcm47xx_sflash, off - NVRAM_SPACE, sizeof(header), (u8 *)&header);
+		if (ret != sizeof(header))
+			return ret;
+		if (header.magic == NVRAM_HEADER)
+			goto found;
+		off <<= 1;
+	}
+
+	off = FLASH_MIN;
+	while (off <= bcm47xx_sflash.size) {
+		ret = bcm47xx_sflash.read(&bcm47xx_sflash, off - (2 * NVRAM_SPACE), sizeof(header), (u8 *)&header);
+		if (ret != sizeof(header))
+			return ret;
+		if (header.magic == NVRAM_HEADER)
+			goto found;
+		off <<= 1;
+	}
+	return -1;
+
+found:
+	len = NVRAM_SPACE;
+	dst = nvram_buf;
+	while (len) {
+		ret = bcm47xx_sflash.read(&bcm47xx_sflash, off - (2 * NVRAM_SPACE), len, dst);
+		if (ret < 0)
+			return ret;
+		off += ret;
+		len -= ret;
+		dst += ret;
+	}
+	return 0;
+}
+
+static void early_nvram_init(void)
+{
+	int err = 0;
+
+	switch (bcm47xx_bus_type) {
+#ifdef CONFIG_BCM47XX_SSB
+	case BCM47XX_BUS_TYPE_SSB:
+		if (bcm47xx_bus.ssb.chipco.flash_type == SSB_PFLASH) {
+			early_nvram_init_pflash();
+		} else if (bcm47xx_bus.ssb.chipco.flash_type == SSB_SFLASH) {
+			err = early_nvram_init_sflash();
+			if (err < 0)
+				printk(KERN_WARNING "can not read from flash: %i\n", err);
+		} else {
+			printk(KERN_WARNING "unknow flash type\n");
+		}
+		break;
+#endif
+#ifdef CONFIG_BCM47XX_BCMA
+	case BCM47XX_BUS_TYPE_BCMA:
+		if (bcm47xx_bus.bcma.bus.drv_cc.flash_type == BCMA_PFLASH) {
+			early_nvram_init_pflash();
+		} else if (bcm47xx_bus.bcma.bus.drv_cc.flash_type == BCMA_SFLASH) {
+			err = early_nvram_init_sflash();
+			if (err < 0)
+				printk(KERN_WARNING "can not read from flash: %i\n", err);
+		} else {
+			printk(KERN_WARNING "unknow flash type\n");
+		}
+		break;
+#endif
+	}
 }
 
 int nvram_getenv(char *name, char *val, size_t val_len)