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

target/linux/brcm63xx/patches-2.6.37/977-ssb_export_fallback_sprom.patch

@@ -1,20 +1,19 @@
---- a/drivers/ssb/sprom.c
-+++ b/drivers/ssb/sprom.c
-@@ -176,6 +176,7 @@ const struct ssb_sprom *ssb_get_fallback
+--- a/arch/mips/bcm63xx/boards/board_bcm963xx.c
++++ b/arch/mips/bcm63xx/boards/board_bcm963xx.c
+@@ -1907,7 +1907,7 @@ static void __init nb4_nvram_fixup(void)
+  * bcm4318 WLAN work
+  */
+ #ifdef CONFIG_SSB_PCIHOST
+-static struct ssb_sprom bcm63xx_sprom = {
++struct ssb_sprom bcm63xx_sprom = {
+ 	.revision		= 0x02,
+ 	.board_rev		= 0x17,
+ 	.country_code		= 0x0,
+@@ -1927,6 +1927,7 @@ static struct ssb_sprom bcm63xx_sprom =
+ 	.boardflags_lo		= 0x2848,
+ 	.boardflags_hi		= 0x0000,
+ };
++EXPORT_SYMBOL(bcm63xx_sprom);
+ 
+ int bcm63xx_get_fallback_sprom(struct ssb_bus *bus)
  {
- 	return fallback_sprom;
- }
-+EXPORT_SYMBOL(ssb_get_fallback_sprom);
- 
- /* http://bcm-v4.sipsolutions.net/802.11/IsSpromAvailable */
- bool ssb_is_sprom_available(struct ssb_bus *bus)
---- a/include/linux/ssb/ssb.h
-+++ b/include/linux/ssb/ssb.h
-@@ -401,6 +401,7 @@ extern bool ssb_is_sprom_available(struc
- /* Set a fallback SPROM.
-  * See kdoc at the function definition for complete documentation. */
- extern int ssb_arch_set_fallback_sprom(const struct ssb_sprom *sprom);
-+extern const struct ssb_sprom *ssb_get_fallback_sprom(void);
- 
- /* Suspend a SSB bus.
-  * Call this from the parent bus suspend routine. */