[MIPS] SB1250: Initialize io_map_base

Correctly initialize io_map_base for the SB1250 PCI controller as required
for proper iomap support.  Based on a proposal from Daniel Jacobowitz.
Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/pci/pci-sb1250.c

@@ -207,6 +207,7 @@ struct pci_controller sb1250_controller = {
 
 static int __init sb1250_pcibios_init(void)
 {
+	void __iomem *io_map_base;
 	uint32_t cmdreg;
 	uint64_t reg;
 	extern int pci_probe_only;
@@ -253,12 +254,13 @@ static int __init sb1250_pcibios_init(void)
 	 * works correctly with most of Linux's drivers.
 	 * XXX ehs: Should this happen in PCI Device mode?
 	 */
-
-	set_io_port_base((unsigned long)
-			 ioremap(A_PHYS_LDTPCI_IO_MATCH_BYTES, 65536));
 	isa_slot_offset = (unsigned long)
 	    ioremap(A_PHYS_LDTPCI_IO_MATCH_BYTES_32, 1024 * 1024);
 
+	io_map_base = ioremap(A_PHYS_LDTPCI_IO_MATCH_BYTES, 1024 * 1024);
+	sb1250_controller.io_map_base = io_map_base;
+	set_io_port_base((unsigned long)io_map_base);
+
 #ifdef CONFIG_SIBYTE_HAS_LDT
 	/*
 	 * Also check the LDT bridge's enable, just in case we didn't