FRV: Enable the MB86943 PCI arbiter correctly

Enable the MB93090 motherboard's MB86943 PCI arbiter correctly by assigning to
the register rather than comparing against it.  This is required to support
bus mastering.
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

arch/frv/mb93090-mb00/pci-vdk.c

@@ -400,7 +400,8 @@ int __init pcibios_init(void)
 	__reg_MB86943_pci_sl_mem_base	= __region_CS2 + 0x08000000;
 	mb();
 
-	*(volatile unsigned long *)(__region_CS2+0x01300014) == 1;
+	/* enable PCI arbitration */
+	__reg_MB86943_pci_arbiter	= MB86943_PCIARB_EN;
 
 	ioport_resource.start	= (__reg_MB86943_sl_pci_io_base << 9) & 0xfffffc00;
 	ioport_resource.end	= (__reg_MB86943_sl_pci_io_range << 9) | 0x3ff;

include/asm-frv/mb86943a.h

@@ -36,4 +36,7 @@
 #define __reg_MB86943_pci_sl_io_base	*(volatile uint32_t *) (__region_CS1 + 0x70)
 #define __reg_MB86943_pci_sl_mem_base	*(volatile uint32_t *) (__region_CS1 + 0x78)
 
+#define __reg_MB86943_pci_arbiter	*(volatile uint32_t *) (__region_CS2 + 0x01300014)
+#define MB86943_PCIARB_EN		0x00000001
+
 #endif /* _ASM_MB86943A_H */