From 476f5779b77a919f0ced5953de2bf3e0f2d02c07 Mon Sep 17 00:00:00 2001 From: Kumar Gala Date: Tue, 26 Jun 2007 12:12:55 -0500 Subject: [PATCH] [POWERPC] 86xx: Workaround PCI_PRIMARY_BUS usage The Freescale PCI-e controllers have an issue in that they use the PCI_PRIMARY_BUS register in the virtual P2P bridge to determine which bus number to match on when generating a type 0 config cycle. The issue is if we are renumbering bus numbers to match Linux we will try setting the PCI_PRIMARY_BUS and will not know which bus number to use for generating type 0 config cycles. We surpress writing the register in the P2P bridge and always keep it at zero. In the future when proper PCI domain support is working we should be able to remove this. Signed-off-by: Kumar Gala --- arch/powerpc/platforms/86xx/pci.c | 4 +++- arch/powerpc/sysdev/indirect_pci.c | 6 ++++++ include/asm-ppc/pci-bridge.h | 5 +++++ 3 files changed, 14 insertions(+), 1 deletion(-) diff --git a/arch/powerpc/platforms/86xx/pci.c b/arch/powerpc/platforms/86xx/pci.c index 3825e1ac5312..6f3c0f674bbf 100644 --- a/arch/powerpc/platforms/86xx/pci.c +++ b/arch/powerpc/platforms/86xx/pci.c @@ -158,11 +158,13 @@ int __init mpc86xx_add_bridge(struct device_node *dev) printk(KERN_WARNING "Can't get bus-range for %s, assume" " bus 0\n", dev->full_name); + pci_assign_all_buses = 1; hose = pcibios_alloc_controller(); if (!hose) return -ENOMEM; hose->arch_data = dev; - hose->indirect_type = PPC_INDIRECT_TYPE_EXT_REG; + hose->indirect_type = PPC_INDIRECT_TYPE_EXT_REG | + PPC_INDIRECT_TYPE_SURPRESS_PRIMARY_BUS; hose->first_busno = bus_range ? bus_range[0] : 0x0; hose->last_busno = bus_range ? bus_range[1] : 0xff; diff --git a/arch/powerpc/sysdev/indirect_pci.c b/arch/powerpc/sysdev/indirect_pci.c index 3a1612253c60..c7e6e859b393 100644 --- a/arch/powerpc/sysdev/indirect_pci.c +++ b/arch/powerpc/sysdev/indirect_pci.c @@ -103,6 +103,12 @@ indirect_write_config(struct pci_bus *bus, unsigned int devfn, int offset, (0x80000000 | (bus_no << 16) | (devfn << 8) | reg | cfg_type)); + /* surpress setting of PCI_PRIMARY_BUS */ + if (hose->indirect_type & PPC_INDIRECT_TYPE_SURPRESS_PRIMARY_BUS) + if ((offset == PCI_PRIMARY_BUS) && + (bus->number == hose->first_busno)) + val &= 0xffffff00; + /* * Note: the caller has already checked that offset is * suitably aligned and that len is 1, 2 or 4. diff --git a/include/asm-ppc/pci-bridge.h b/include/asm-ppc/pci-bridge.h index 0dee56b839a4..c09fbf02ef24 100644 --- a/include/asm-ppc/pci-bridge.h +++ b/include/asm-ppc/pci-bridge.h @@ -73,9 +73,14 @@ struct pci_controller { * Used for variants of PCI indirect handling and possible quirks: * SET_CFG_TYPE - used on 4xx or any PHB that does explicit type0/1 * EXT_REG - provides access to PCI-e extended registers + * SURPRESS_PRIMARY_BUS - we surpress the setting of PCI_PRIMARY_BUS + * on Freescale PCI-e controllers since they used the PCI_PRIMARY_BUS + * to determine which bus number to match on when generating type0 + * config cycles */ #define PPC_INDIRECT_TYPE_SET_CFG_TYPE (0x00000001) #define PPC_INDIRECT_TYPE_EXT_REG (0x00000002) +#define PPC_INDIRECT_TYPE_SURPRESS_PRIMARY_BUS (0x00000004) u32 indirect_type; /* Currently, we limit ourselves to 1 IO range and 3 mem