openwrt/target/linux/brcm47xx/patches-3.3/029-bcm47xx-read-nvram-from-sflash.patch

--- 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;
@@ -50,9 +51,6 @@ static void early_nvram_init(void)
 #ifdef CONFIG_BCM47XX_BCMA
 	case BCM47XX_BUS_TYPE_BCMA:
 		bcma_cc = &bcm47xx_bus.bcma.bus.drv_cc;
-		if (bcma_cc->flash_type != BCMA_PFLASH)
-			return;
-
 		base = bcma_cc->pflash.window;
 		lim = bcma_cc->pflash.window_size;
 		break;
@@ -86,7 +84,115 @@ 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 find_nvram_size(void)
+{
+	struct nvram_header header;
+	int nvram_sizes[] = {NVRAM_SPACE, 0xF000, 2 * NVRAM_SPACE};
+	int i;
+	int ret;
+
+	for (i = 0; i < sizeof(nvram_sizes); i++) {
+		ret = bcm47xx_sflash.read(&bcm47xx_sflash, bcm47xx_sflash.size - nvram_sizes[i], sizeof(header), (u8 *)&header);
+		if (ret != sizeof(header))
+			return ret;
+		if (header.magic == NVRAM_HEADER)
+			return nvram_sizes[i];
+	}
+	return -1;
+}
+
+static int early_nvram_init_sflash(void)
+{
+	u32 off;
+	int ret;
+	char *dst;
+	int len;
+	int size;
+
+	/* check if the struct is already initilized */
+	if (!bcm47xx_sflash.size)
+		return -1;
+
+	size = find_nvram_size();
+	if (size <= 0)
+		return size;
+
+	len = NVRAM_SPACE;
+	dst = nvram_buf;
+	off = bcm47xx_sflash.size;
+	if (size > len) {
+		printk(KERN_WARNING "nvram on flash is bigger than the reserved"
+		       " space in memory, will just copy the first %i bytes\n",
+		       len);
+	}
+	while (len) {
+		ret = bcm47xx_sflash.read(&bcm47xx_sflash, off - size, len, dst);
+		if (ret < 0)
+			return ret;
+		off += ret;
+		len -= ret;
+		dst += ret;
+	}
+	return 0;
+}
+
+#ifdef CONFIG_BCM47XX_SSB
+static void early_nvram_init_ssb(void)
+{
+	int err;
+
+	switch (bcm47xx_bus.ssb.chipco.flash_type) {
+	case SSB_PFLASH:
+		early_nvram_init_pflash();
+		break;
+	case SSB_SFLASH:
+		err = early_nvram_init_sflash();
+		if (err < 0)
+			printk(KERN_WARNING "can not read from flash: %i\n", err);
+		break;
+	default:
+		printk(KERN_WARNING "unknow flash type\n");
+	}
+}
+#endif
+
+#ifdef CONFIG_BCM47XX_BCMA
+static void early_nvram_init_bcma(void)
+{
+	int err;
+
+	switch (bcm47xx_bus.bcma.bus.drv_cc.flash_type) {
+	case BCMA_PFLASH:
+		early_nvram_init_pflash();
+		break;
+	case BCMA_SFLASH:
+		err = early_nvram_init_sflash();
+		if (err < 0)
+			printk(KERN_WARNING "can not read from flash: %i\n", err);
+		break;
+	default:
+		printk(KERN_WARNING "unknow flash type\n");
+	}
+}
+#endif
+
+static void early_nvram_init(void)
+{
+	switch (bcm47xx_bus_type) {
+#ifdef CONFIG_BCM47XX_SSB
+	case BCM47XX_BUS_TYPE_SSB:
+		early_nvram_init_ssb();
+		break;
+#endif
+#ifdef CONFIG_BCM47XX_BCMA
+	case BCM47XX_BUS_TYPE_BCMA:
+		early_nvram_init_bcma();
+		break;
+#endif
+	}
 }
 
 int nvram_getenv(char *name, char *val, size_t val_len)