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>

diff --git a/arch/frv/mb93090-mb00/pci-vdk.c b/arch/frv/mb93090-mb00/pci-vdk.c
index 0b581e3cf7c75602cfc122d9f58098620dccecdc..6d51f133fb23285793adc4bebb0f2adbb3c105bd 100644 (file)
--- 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 b89fd0b56bb30d66abaa6f479781d2ca5998a6cd..e87ef924bfb484224792ab04eb80eb4a7fb52b91 100644 (file)
--- 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 */