pci: sh7751: map PCI memory space into SDRAM

For ease of use and accounting a condition that on SH4
pci_phys_to_bus() and pci_bus_to_phys() are one in one mappings due to
unimplemented __iomem() conversion, this change fixes access to SDRAM
memory by PCI devices.

This change also generalizes PCI system memory configuration, which is
taken from board specific defines rather than hardcoded in the PCI
host driver.

Signed-off-by: Vladimir Zapolskiy <vz@mleia.com>

drivers/pci/pci_sh7751.c

@@ -66,9 +66,6 @@
 #define SH7751_PCI_IO_BASE		0xFE240000
 #define SH7751_PCI_IO_SIZE		0x00040000
 
-#define SH7751_CS3_BASE_ADDR    0x0C000000
-#define SH7751_P2CS3_BASE_ADDR  0xAC000000
-
 #define SH7751_PCIPAR   (vu_long *)0xFE2001C0
 #define SH7751_PCIPDR   (vu_long *)0xFE200220
 
@@ -153,11 +150,12 @@ int pci_sh7751_init(struct pci_controller *hose)
 
 	/* Set up target memory mappings (for external DMA access) */
 	/* Map both P0 and P2 range to Area 3 RAM for ease of use */
-	p4_out((64 - 1) << 20, SH7751_PCILSR0);
-	p4_out(SH7751_CS3_BASE_ADDR, SH7751_PCILAR0);
+	p4_out(CONFIG_SYS_SDRAM_SIZE - 0x100000, SH7751_PCILSR0);
+	p4_out(CONFIG_SYS_SDRAM_BASE & 0x1FF00000, SH7751_PCILAR0);
+	p4_out(CONFIG_SYS_SDRAM_BASE & 0xFFF00000, SH7751_PCICONF5);
+
 	p4_out(0, SH7751_PCILSR1);
 	p4_out(0, SH7751_PCILAR1);
-	p4_out(SH7751_CS3_BASE_ADDR, SH7751_PCICONF5);
 	p4_out(0xd0000000, SH7751_PCICONF6);
 
 	/* Map memory window to same address on PCI bus */