Patchwork powerpc: Enable /dev/port when isa_io_special is set

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Submitter Benjamin Herrenschmidt
Date Aug. 29, 2013, 6:55 a.m.
Message ID <1377759307.4028.23.camel@pasglop>
Download mbox | patch
Permalink /patch/270691/
State Accepted
Commit ac237b65f56c9b80d7774c35ccce15a74d445621
Delegated to: Benjamin Herrenschmidt
Headers show

Comments

Benjamin Herrenschmidt - Aug. 29, 2013, 6:55 a.m.
isa_io_special is set when the platform provides a "special"
implementation of inX/outX via some FW interface for example.

Such a platform doesn't need an ISA bridge on PCI, and so /dev/port
should be made available even if one isn't present.

This makes the LPC bus IOs accessible via /dev/port on PowerNV Power8

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
---
 arch/powerpc/include/asm/io.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Patch

diff --git a/arch/powerpc/include/asm/io.h b/arch/powerpc/include/asm/io.h
index 5a64757..edcc209 100644
--- a/arch/powerpc/include/asm/io.h
+++ b/arch/powerpc/include/asm/io.h
@@ -21,7 +21,7 @@  extern struct pci_dev *isa_bridge_pcidev;
 /*
  * has legacy ISA devices ?
  */
-#define arch_has_dev_port()	(isa_bridge_pcidev != NULL)
+#define arch_has_dev_port()	(isa_bridge_pcidev != NULL || isa_io_special)
 #endif
 
 #include <linux/device.h>