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>

2 files changed, 5 insertions, 1 deletions

diff --git a/arch/frv/mb93090-mb00/pci-vdk.c b/arch/frv/mb93090-mb00/pci-vdk.c
index 0b581e3cf7c7..6d51f133fb23 100644
--- a/arch/frv/mb93090-mb00/pci-vdk.c
+++ b/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;
diff --git a/include/asm-frv/mb86943a.h b/include/asm-frv/mb86943a.h
index b89fd0b56bb3..e87ef924bfb4 100644
--- a/include/asm-frv/mb86943a.h
+++ b/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 */