sh: pci: HAVE_PCI_MMAP support.

Derived from the MIPS version, now uses pgprot_noncached().

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

arch/sh/drivers/pci/Makefile

@@ -1,9 +1,9 @@
 #
 # Makefile for the PCI specific kernel interface routines under Linux.
 #
-
-obj-$(CONFIG_PCI_AUTO)			:= pci.o pci-auto.o
-obj-$(CONFIG_PCI_NEW)			:= pci-new.o
+obj-y					+= pci-lib.o
+obj-$(CONFIG_PCI_AUTO)			+= pci.o pci-auto.o
+obj-$(CONFIG_PCI_NEW)			+= pci-new.o
 
 obj-$(CONFIG_CPU_SUBTYPE_SH7751)	+= pci-sh7751.o ops-sh4.o
 obj-$(CONFIG_CPU_SUBTYPE_SH7751R)	+= pci-sh7751.o ops-sh4.o

arch/sh/drivers/pci/pci-lib.c

@@ -0,0 +1,26 @@
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/pci.h>
+
+int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma,
+			enum pci_mmap_state mmap_state, int write_combine)
+{
+	/*
+	 * I/O space can be accessed via normal processor loads and stores on
+	 * this platform but for now we elect not to do this and portable
+	 * drivers should not do this anyway.
+	 */
+	if (mmap_state == pci_mmap_io)
+		return -EINVAL;
+
+	/*
+	 * Ignore write-combine; for now only return uncached mappings.
+	 */
+	vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
+
+	return remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
+			       vma->vm_end - vma->vm_start,
+			       vma->vm_page_prot);
+}

arch/sh/include/asm/pci.h

@@ -40,6 +40,9 @@ extern struct pci_channel board_pci_channels[];
 
 struct pci_dev;
 
+#define HAVE_PCI_MMAP
+extern int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma,
+	enum pci_mmap_state mmap_state, int write_combine);
 extern void pcibios_set_master(struct pci_dev *dev);
 
 static inline void pcibios_penalize_isa_irq(int irq, int active)