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Subject[PATCH 3/4] x86, pci: add dummy pci device for early stage

So we can pass pci_dev *dev to reuse some generic pci functions.

Signed-off-by: Yinghai Lu <yinghai@kernel.org>

---
arch/x86/include/asm/pci-direct.h | 2 +
arch/x86/pci/early.c | 75 ++++++++++++++++++++++++++++++++++++++
2 files changed, 77 insertions(+)

Index: linux-2.6/arch/x86/include/asm/pci-direct.h
===================================================================
--- linux-2.6.orig/arch/x86/include/asm/pci-direct.h
+++ linux-2.6/arch/x86/include/asm/pci-direct.h
@@ -18,4 +18,6 @@ extern int early_pci_allowed(void);
extern unsigned int pci_early_dump_regs;
extern void early_dump_pci_device(u8 bus, u8 slot, u8 func);
extern void early_dump_pci_devices(void);
+
+struct pci_dev *get_early_pci_dev(int num, int slot, int func);
#endif /* _ASM_X86_PCI_DIRECT_H */
Index: linux-2.6/arch/x86/pci/early.c
===================================================================
--- linux-2.6.orig/arch/x86/pci/early.c
+++ linux-2.6/arch/x86/pci/early.c
@@ -109,3 +109,78 @@ void early_dump_pci_devices(void)
}
}
}
+
+static __init int
+early_pci_read(struct pci_bus *bus, unsigned int devfn, int where,
+ int size, u32 *value)
+{
+ int num, slot, func;
+
+ num = bus->number;
+ slot = devfn >> 3;
+ func = devfn & 7;
+ switch (size) {
+ case 1:
+ *value = read_pci_config_byte(num, slot, func, where);
+ break;
+ case 2:
+ *value = read_pci_config_16(num, slot, func, where);
+ break;
+ case 4:
+ *value = read_pci_config(num, slot, func, where);
+ break;
+ }
+
+ return 0;
+}
+
+static __init int
+early_pci_write(struct pci_bus *bus, unsigned int devfn, int where,
+ int size, u32 value)
+{
+ int num, slot, func;
+
+ num = bus->number;
+ slot = devfn >> 3;
+ func = devfn & 7;
+ switch (size) {
+ case 1:
+ write_pci_config_byte(num, slot, func, where, (u8)value);
+ break;
+ case 2:
+ write_pci_config_16(num, slot, func, where, (u16)value);
+ break;
+ case 4:
+ write_pci_config(num, slot, func, where, (u32)value);
+ break;
+ }
+
+ return 0;
+}
+
+static __initdata struct pci_ops pci_early_ops = {
+ .read = early_pci_read,
+ .write = early_pci_write,
+};
+
+static __initdata struct pci_bus pci_early_bus = {
+ .ops = &pci_early_ops,
+};
+
+static __initdata char pci_device_init_name[8];
+static __initdata struct pci_dev pci_early_dev = {
+ .bus = &pci_early_bus,
+};
+
+__init struct pci_dev *get_early_pci_dev(int num, int slot, int func)
+{
+ struct pci_dev *pdev;
+
+ pdev = &pci_early_dev;
+ pdev->devfn = (slot<<3) | (func & 7);
+ pdev->bus->number = num;
+ sprintf(pci_device_init_name, "%02x:%02x.%01x", num, slot, func);
+ pdev->dev.init_name = pci_device_init_name;
+
+ return pdev;
+}

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