MIPS: Alchemy: Redo PCI as platform driver

- Rewrite Alchemy PCI support as a platform driver.
- Fixup boards which have PCI.

Run-tested on DB1500 and DB1550.

Signed-off-by: Manuel Lauss <manuel.lauss@googlemail.com>
To: Linux-MIPS <linux-mips@linux-mips.org>
Patchwork: https://patchwork.linux-mips.org/patch/2706/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

 delete mode 100644 arch/mips/alchemy/common/pci.c
 delete mode 100644 arch/mips/pci/fixup-au1000.c
 delete mode 100644 arch/mips/pci/ops-au1000.c
 create mode 100644 arch/mips/pci/pci-alchemy.c
diff --git a/arch/mips/alchemy/common/setup.c b/arch/mips/alchemy/common/setup.c
index 1b887c8..37ffd99 100644
--- a/arch/mips/alchemy/common/setup.c
+++ b/arch/mips/alchemy/common/setup.c
@@ -73,8 +73,8 @@
 /* This routine should be valid for all Au1x based boards */
 phys_t __fixup_bigphys_addr(phys_t phys_addr, phys_t size)
 {
-	u32 start = (u32)Au1500_PCI_MEM_START;
-	u32 end   = (u32)Au1500_PCI_MEM_END;
+	unsigned long start = ALCHEMY_PCI_MEMWIN_START;
+	unsigned long end = ALCHEMY_PCI_MEMWIN_END;
 
 	/* Don't fixup 36-bit addresses */
 	if ((phys_addr >> 32) != 0)
@@ -82,7 +82,7 @@
 
 	/* Check for PCI memory window */
 	if (phys_addr >= start && (phys_addr + size - 1) <= end)
-		return (phys_t)((phys_addr - start) + Au1500_PCI_MEM_START);
+		return (phys_t)(AU1500_PCI_MEM_PHYS_ADDR + phys_addr);
 
 	/* default nop */
 	return phys_addr;