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, 48 insertions, 0 deletions

diff --git a/target/linux/brcm47xx/patches-2.6.38/033-bcm47xx-register-fallback-callback.patch b/target/linux/brcm47xx/patches-2.6.38/033-bcm47xx-register-fallback-callback.patch
new file mode 100644
index 000000000..f63deacdd
--- /dev/null
+++ b/target/linux/brcm47xx/patches-2.6.38/033-bcm47xx-register-fallback-callback.patch
@@ -0,0 +1,48 @@
+--- a/arch/mips/bcm47xx/nvram.c
++++ b/arch/mips/bcm47xx/nvram.c
+@@ -23,7 +23,7 @@
+ static char nvram_buf[NVRAM_SPACE];
+ 
+ /* Probe for NVRAM header */
+-static void __init early_nvram_init(void)
++static void early_nvram_init(void)
+ {
+ 	struct ssb_mipscore *mcore = &ssb_bcm47xx.mipscore;
+ 	struct nvram_header *header;
+--- a/arch/mips/bcm47xx/setup.c
++++ b/arch/mips/bcm47xx/setup.c
+@@ -156,6 +156,22 @@ static void bcm47xx_fill_sprom(struct ss
+ 	}
+ }
+ 
++int bcm47xx_get_sprom(struct ssb_bus *bus)
++{
++	char prefix[10];
++
++	if (bus->bustype == SSB_BUSTYPE_PCI) {
++		snprintf(prefix, sizeof(prefix), "pci/%x/%x/",
++			 bus->host_pci->bus->number + 1,
++			 PCI_SLOT(bus->host_pci->devfn));
++		bcm47xx_fill_sprom(&bus->sprom, prefix);
++		return 0;
++	} else {
++		printk(KERN_WARNING "bcm47xx: unable to fill SPROM for given bustype.\n");
++		return -EINVAL;
++	}
++}
++
+ static int bcm47xx_get_invariants(struct ssb_bus *bus,
+ 				   struct ssb_init_invariants *iv)
+ {
+@@ -212,6 +228,11 @@ void __init plat_mem_setup(void)
+ 	char buf[100];
+ 	struct ssb_mipscore *mcore;
+ 
++	err = ssb_arch_register_fallback_sprom(&bcm47xx_get_sprom);
++	if (err)
++		printk(KERN_WARNING "bcm47xx: someone else already registered"
++			" a ssb SPROM callback handler (err %d)\n", err);
++
+ 	err = ssb_bus_ssbbus_register(&ssb_bcm47xx, SSB_ENUM_BASE,
+ 				      bcm47xx_get_invariants);
+ 	if (err)