brcm47xx: add fallback sprom for pci devices without an own sprom.

If there is no sprom on an ssb based pci device on the brcm47xx
architecture ssb now asks the architecture code to look into the nvram
to get some sprom data for this device. Now we are able to read out
pci/1/1/ foo or pci/1/3/ foo config options.

This will fix some problems where the wireless devices does not got an 
mac address and the following message was show:
ssb: WARNING: Invalid SPROM CRC (corrupt SPROM)


git-svn-id: svn://svn.openwrt.org/openwrt/trunk@26801 3c298f89-4303-0410-b956-a3cf2f4a3e73

1 files changed, 69 insertions, 0 deletions

diff --git a/target/linux/brcm47xx/patches-2.6.38/032-bcm47xx-extend-bcm47xx_fill_sprom-with-prefix.patch b/target/linux/brcm47xx/patches-2.6.38/032-bcm47xx-extend-bcm47xx_fill_sprom-with-prefix.patch
new file mode 100644
index 0000000000..acf65bd8c2
--- /dev/null
+++ b/target/linux/brcm47xx/patches-2.6.38/032-bcm47xx-extend-bcm47xx_fill_sprom-with-prefix.patch
@@ -0,0 +1,69 @@
+--- a/arch/mips/bcm47xx/setup.c
++++ b/arch/mips/bcm47xx/setup.c
+@@ -59,10 +59,23 @@ static void bcm47xx_machine_halt(void)
+ }
+ 
+ #define READ_FROM_NVRAM(_outvar, name, buf) \
+-	if (nvram_getenv(name, buf, sizeof(buf)) >= 0)\
++	if (nvram_getprefix(prefix, name, buf, sizeof(buf)) >= 0)\
+ 		sprom->_outvar = simple_strtoul(buf, NULL, 0);
+ 
+-static void bcm47xx_fill_sprom(struct ssb_sprom *sprom)
++static inline int nvram_getprefix(const char *prefix, char *name,
++				  char *buf, int len)
++{
++	if (prefix) {
++		char key[100];
++
++		snprintf(key, sizeof(key), "%s%s", prefix, name);
++		return nvram_getenv(key, buf, len);
++	}
++
++	return nvram_getenv(name, buf, len);
++}
++
++static void bcm47xx_fill_sprom(struct ssb_sprom *sprom, const char *prefix)
+ {
+ 	char buf[100];
+ 	u32 boardflags;
+@@ -71,11 +84,11 @@ static void bcm47xx_fill_sprom(struct ss
+ 
+ 	sprom->revision = 1; /* Fallback: Old hardware does not define this. */
+ 	READ_FROM_NVRAM(revision, "sromrev", buf);
+-	if (nvram_getenv("il0macaddr", buf, sizeof(buf)) >= 0)
++	if (nvram_getprefix(prefix, "il0macaddr", buf, sizeof(buf)) >= 0)
+ 		nvram_parse_macaddr(buf, sprom->il0mac);
+-	if (nvram_getenv("et0macaddr", buf, sizeof(buf)) >= 0)
++	if (nvram_getprefix(prefix, "et0macaddr", buf, sizeof(buf)) >= 0)
+ 		nvram_parse_macaddr(buf, sprom->et0mac);
+-	if (nvram_getenv("et1macaddr", buf, sizeof(buf)) >= 0)
++	if (nvram_getprefix(prefix, "et1macaddr", buf, sizeof(buf)) >= 0)
+ 		nvram_parse_macaddr(buf, sprom->et1mac);
+ 	READ_FROM_NVRAM(et0phyaddr, "et0phyaddr", buf);
+ 	READ_FROM_NVRAM(et1phyaddr, "et1phyaddr", buf);
+@@ -127,14 +140,14 @@ static void bcm47xx_fill_sprom(struct ss
+ 	READ_FROM_NVRAM(ofdm5gpo, "ofdm5gpo", buf);
+ 	READ_FROM_NVRAM(ofdm5ghpo, "ofdm5ghpo", buf);
+ 
+-	if (nvram_getenv("boardflags", buf, sizeof(buf)) >= 0) {
++	if (nvram_getprefix(prefix, "boardflags", buf, sizeof(buf)) >= 0) {
+ 		boardflags = simple_strtoul(buf, NULL, 0);
+ 		if (boardflags) {
+ 			sprom->boardflags_lo = (boardflags & 0x0000FFFFU);
+ 			sprom->boardflags_hi = (boardflags & 0xFFFF0000U) >> 16;
+ 		}
+ 	}
+-	if (nvram_getenv("boardflags2", buf, sizeof(buf)) >= 0) {
++	if (nvram_getprefix(prefix, "boardflags2", buf, sizeof(buf)) >= 0) {
+ 		boardflags = simple_strtoul(buf, NULL, 0);
+ 		if (boardflags) {
+ 			sprom->boardflags2_lo = (boardflags & 0x0000FFFFU);
+@@ -160,7 +173,7 @@ static int bcm47xx_get_invariants(struct
+ 	if (nvram_getenv("boardrev", buf, sizeof(buf)) >= 0)
+ 		iv->boardinfo.rev = (u16)simple_strtoul(buf, NULL, 0);
+ 
+-	bcm47xx_fill_sprom(&iv->sprom);
++	bcm47xx_fill_sprom(&iv->sprom, NULL);
+ 
+ 	if (nvram_getenv("cardbus", buf, sizeof(buf)) >= 0)
+ 		iv->has_cardbus_slot = !!simple_strtoul(buf, NULL, 10);