powerpc: Enable /dev/port when isa_io_special is set
authorBenjamin Herrenschmidt <benh@kernel.crashing.org>
Thu, 29 Aug 2013 06:55:07 +0000 (16:55 +1000)
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>
Fri, 11 Oct 2013 05:53:30 +0000 (16:53 +1100)
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

index db1f29673c0688a1de7f88fd00b7e1e6ad42211e..575fbf81fad02dcd8e946cecfa9c5d5c35e11810 100644 (file)
@@ -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>