From now on, readb()/writeb()/etc. generic calls are used as default
approach. Special MMIO accessors are registered for AMD Fam10h CPUs only.

Signed-off-by: Tomasz Nowicki <redacted>
---
 arch/x86/include/asm/pci_x86.h |   8 +++
 arch/x86/pci/mmconfig-shared.c | 114 +++++++++++++++++++++++++++++++++++++++++
 arch/x86/pci/mmconfig_32.c     |  24 +--------
 arch/x86/pci/mmconfig_64.c     |  24 +--------
 arch/x86/pci/numachip.c        |  24 +--------
 5 files changed, 128 insertions(+), 66 deletions(-)

diff --git a/arch/x86/include/asm/pci_x86.h b/arch/x86/include/asm/pci_x86.h
index d024f4d..c57c225 100644
--- a/arch/x86/include/asm/pci_x86.h
+++ b/arch/x86/include/asm/pci_x86.h

@@ -137,6 +137,11 @@ struct pci_mmcfg_region {
        char name[PCI_MMCFG_RESOURCE_NAME_LEN];
 };

+struct pci_mmcfg_mmio_ops {
+       u32 (*read)(int len, void __iomem *addr);
+       void (*write)(int len, void __iomem *addr, u32 value);

+};
+
 extern int __init pci_mmcfg_arch_init(void);
 extern void __init pci_mmcfg_arch_free(void);
 extern int pci_mmcfg_arch_map(struct pci_mmcfg_region *cfg);

@@ -145,6 +150,9 @@ extern int pci_mmconfig_insert(struct device *dev, u16 seg, u8 start, u8 end,
                               phys_addr_t addr);
 extern int pci_mmconfig_delete(u16 seg, u8 start, u8 end);
 extern struct pci_mmcfg_region *pci_mmconfig_lookup(int segment, int bus);
+extern u32 pci_mmio_read(int len, void __iomem *addr);
+extern void pci_mmio_write(int len, void __iomem *addr, u32 value);
+extern void pci_mmconfig_register_mmio(struct pci_mmcfg_mmio_ops *ops);

 extern struct list_head pci_mmcfg_list;

diff --git a/arch/x86/pci/mmconfig-shared.c b/arch/x86/pci/mmconfig-shared.c
index dd30b7e..8b3bc4f 100644
--- a/arch/x86/pci/mmconfig-shared.c
+++ b/arch/x86/pci/mmconfig-shared.c

@@ -31,6 +31,118 @@ static DEFINE_MUTEX(pci_mmcfg_lock);

 LIST_HEAD(pci_mmcfg_list);

+static u32
+pci_mmconfig_generic_read(int len, void __iomem *addr)
+{
+       u32 data = 0;
+
+       switch (len) {
+       case 1:
+               data = readb(addr);
+               break;
+       case 2:
+               data = readw(addr);
+               break;
+       case 4:
+               data = readl(addr);
+               break;
+       }