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brcm47xx: fix nvram read out on devices with serial flash

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detect nvram on Linksys E3200


git-svn-id: svn://svn.openwrt.org/openwrt/trunk@31790 3c298f89-4303-0410-b956-a3cf2f4a3e73
This commit is contained in:
hauke
2012-05-18 16:04:10 +00:00
parent 1b9dfb678c
commit 5ce0dd5cbe
5 changed files with 36 additions and 31 deletions
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53
target/linux/brcm47xx/patches-3.3/029-bcm47xx-read-nvram-from-sflash.patch
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@@ -24,7 +24,7 @@
base = bcma_cc->pflash.window;
lim = bcma_cc->pflash.window_size;
break;
@@ -86,7 +84,110 @@ found:
@@ -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)
@@ -32,44 +32,49 @@
+ *dst++ = *src++;
+}
+
+static int early_nvram_init_sflash(void)
+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;
+
+ 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;
+ }
+ size = find_nvram_size();
+ if (size <= 0)
+ return size;
+
+ 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;
+ 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 - (2 * NVRAM_SPACE), len, dst);
+ ret = bcm47xx_sflash.read(&bcm47xx_sflash, off - size, len, dst);
+ if (ret < 0)
+ return ret;
+ off += ret;