bcm63xx: fix a race between PCI bus scan and fallback sprom registration

The fallback sprom handler was installed too late, resulting in ssb
failing to get a valid sprom on some devices.

Fixes #11384.

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@31638 3c298f89-4303-0410-b956-a3cf2f4a3e73

1 files changed, 89 insertions, 0 deletions

diff --git a/target/linux/brcm63xx/patches-3.3/307-MIPS-BCM63XX-explicitly-register-the-pci-bus.patch b/target/linux/brcm63xx/patches-3.3/307-MIPS-BCM63XX-explicitly-register-the-pci-bus.patch
new file mode 100644
index 0000000000..284a7590e1
--- /dev/null
+++ b/target/linux/brcm63xx/patches-3.3/307-MIPS-BCM63XX-explicitly-register-the-pci-bus.patch
@@ -0,0 +1,89 @@
+From 45aebb9465e22b236a201deef1b234693d99e174 Mon Sep 17 00:00:00 2001
+From: Jonas Gorski <jonas.gorski@gmail.com>
+Date: Sun, 6 May 2012 15:13:48 +0200
+Subject: [PATCH 2/2] MIPS: BCM63XX: explicitly register the PCI bus
+
+Instead of setting a global variable toggling the PCI registration,
+register it in the device_register phase after setting the fallback
+sprom to ensure there cannot be a race between them.
+
+Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>
+---
+ arch/mips/bcm63xx/boards/board_bcm963xx.c          |    6 +++++-
+ .../include/asm/mach-bcm63xx/bcm63xx_dev_pci.h     |    4 +++-
+ arch/mips/pci/pci-bcm63xx.c                        |   13 +------------
+ 3 files changed, 9 insertions(+), 14 deletions(-)
+
+--- a/arch/mips/bcm63xx/boards/board_bcm963xx.c
++++ b/arch/mips/bcm63xx/boards/board_bcm963xx.c
+@@ -825,7 +825,6 @@ void __init board_prom_init(void)
+ 
+ #ifdef CONFIG_PCI
+ 	if (board.has_pci) {
+-		bcm63xx_pci_enabled = 1;
+ 		if (BCMCPU_IS_6348())
+ 			val |= GPIO_MODE_6348_G2_PCI;
+ 	}
+@@ -997,5 +996,10 @@ int __init board_register_devices(void)
+ 		platform_device_register(&bcm63xx_gpio_keys_device);
+ 	}
+ 
++#ifdef CONFIG_PCI
++	if (board.has_pci)
++		bcm63xx_pci_register();
++#endif
++
+ 	return 0;
+ }
+--- a/arch/mips/include/asm/mach-bcm63xx/bcm63xx_dev_pci.h
++++ b/arch/mips/include/asm/mach-bcm63xx/bcm63xx_dev_pci.h
+@@ -1,6 +1,8 @@
+ #ifndef BCM63XX_DEV_PCI_H_
+ #define BCM63XX_DEV_PCI_H_
+ 
+-extern int bcm63xx_pci_enabled;
++#include <linux/init.h>
++
++int __init bcm63xx_pci_register(void);
+ 
+ #endif /* BCM63XX_DEV_PCI_H_ */
+--- a/arch/mips/pci/pci-bcm63xx.c
++++ b/arch/mips/pci/pci-bcm63xx.c
+@@ -14,12 +14,6 @@
+ 
+ #include "pci-bcm63xx.h"
+ 
+-/*
+- * Allow PCI to be disabled at runtime depending on board nvram
+- * configuration
+- */
+-int bcm63xx_pci_enabled;
+-
+ static struct resource bcm_pci_mem_resource = {
+ 	.name   = "bcm63xx PCI memory space",
+ 	.start  = BCM_PCI_MEM_BASE_PA,
+@@ -94,7 +88,7 @@ static void bcm63xx_int_cfg_writel(u32 v
+ 
+ void __iomem *pci_iospace_start;
+ 
+-static int __init bcm63xx_pci_init(void)
++int __init bcm63xx_pci_register(void)
+ {
+ 	unsigned int mem_size;
+ 	u32 val;
+@@ -102,9 +96,6 @@ static int __init bcm63xx_pci_init(void)
+ 	if (!BCMCPU_IS_6348() && !BCMCPU_IS_6358() && !BCMCPU_IS_6368())
+ 		return -ENODEV;
+ 
+-	if (!bcm63xx_pci_enabled)
+-		return -ENODEV;
+-
+ 	/*
+ 	 * configuration  access are  done through  IO space,  remap 4
+ 	 * first bytes to access it from CPU.
+@@ -220,5 +211,3 @@ static int __init bcm63xx_pci_init(void)
+ 			   "bcm63xx PCI IO space");
+ 	return 0;
+ }
+-
+-arch_initcall(bcm63xx_pci_init);