1 files changed, 111 insertions, 0 deletions
diff --git a/arch/m32r/mm/ioremap.c b/arch/m32r/mm/ioremap.c
new file mode 100644
index 000000000..5152c4e6a
--- /dev/null
+++ b/arch/m32r/mm/ioremap.c
@@ -0,0 +1,111 @@
+/*
+ *  linux/arch/m32r/mm/ioremap.c
+ *
+ *  Copyright (c) 2001, 2002  Hiroyuki Kondo
+ *
+ *  Taken from mips version.
+ *    (C) Copyright 1995 1996 Linus Torvalds
+ *    (C) Copyright 2001 Ralf Baechle
+ */
+
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ */
+
+#include <linux/module.h>
+#include <asm/addrspace.h>
+#include <asm/byteorder.h>
+
+#include <linux/vmalloc.h>
+#include <linux/io.h>
+#include <asm/pgalloc.h>
+
+/*
+ * Generic mapping function (not visible outside):
+ */
+
+/*
+ * Remap an arbitrary physical address space into the kernel virtual
+ * address space. Needed when the kernel wants to access high addresses
+ * directly.
+ *
+ * NOTE! We need to allow non-page-aligned mappings too: we will obviously
+ * have to convert them into an offset in a page-aligned mapping, but the
+ * caller shouldn't need to know that small detail.
+ */
+
+#define IS_LOW512(addr) (!((unsigned long)(addr) & ~0x1fffffffUL))
+
+void __iomem *
+__ioremap(unsigned long phys_addr, unsigned long size, unsigned long flags)
+{
+	void __iomem * addr;
+	struct vm_struct * area;
+	unsigned long offset, last_addr;
+	pgprot_t pgprot;
+
+	/* Don't allow wraparound or zero size */
+	last_addr = phys_addr + size - 1;
+	if (!size || last_addr < phys_addr)
+		return NULL;
+
+	/*
+	 * Map objects in the low 512mb of address space using KSEG1, otherwise
+	 * map using page tables.
+	 */
+	if (IS_LOW512(phys_addr) && IS_LOW512(phys_addr + size - 1))
+		return (void *) KSEG1ADDR(phys_addr);
+
+	/*
+	 * Don't allow anybody to remap normal RAM that we're using..
+	 */
+	if (phys_addr < virt_to_phys(high_memory)) {
+		char *t_addr, *t_end;
+		struct page *page;
+
+		t_addr = __va(phys_addr);
+		t_end = t_addr + (size - 1);
+
+		for(page = virt_to_page(t_addr); page <= virt_to_page(t_end); page++)
+			if(!PageReserved(page))
+				return NULL;
+	}
+
+	pgprot = __pgprot(_PAGE_GLOBAL | _PAGE_PRESENT | _PAGE_READ
+			  | _PAGE_WRITE | flags);
+
+	/*
+	 * Mappings have to be page-aligned
+	 */
+	offset = phys_addr & ~PAGE_MASK;
+	phys_addr &= PAGE_MASK;
+	size = PAGE_ALIGN(last_addr + 1) - phys_addr;
+
+	/*
+	 * Ok, go for it..
+	 */
+	area = get_vm_area(size, VM_IOREMAP);
+	if (!area)
+		return NULL;
+	area->phys_addr = phys_addr;
+	addr = (void __iomem *) area->addr;
+	if (ioremap_page_range((unsigned long)addr, (unsigned long)addr + size,
+			       phys_addr, pgprot)) {
+		vunmap((void __force *) addr);
+		return NULL;
+	}
+
+	return (void __iomem *) (offset + (char __iomem *)addr);
+}
+
+#define IS_KSEG1(addr) (((unsigned long)(addr) & ~0x1fffffffUL) == KSEG1)
+
+void iounmap(volatile void __iomem *addr)
+{
+	if (!IS_KSEG1(addr))
+		vfree((void *) (PAGE_MASK & (unsigned long) addr));
+}
+