1/*
2 * arch/cris/mm/ioremap.c
3 *
4 * Re-map IO memory to kernel address space so that we can access it.
5 * Needed for memory-mapped I/O devices mapped outside our normal DRAM
6 * window (that is, all memory-mapped I/O devices).
7 *
8 * (C) Copyright 1995 1996 Linus Torvalds
9 * CRIS-port by Axis Communications AB
10 */
11
12#include <linux/vmalloc.h>
13#include <linux/io.h>
14#include <asm/pgalloc.h>
15#include <asm/arch/memmap.h>
16
17/*
18 * Generic mapping function (not visible outside):
19 */
20
21/*
22 * Remap an arbitrary physical address space into the kernel virtual
23 * address space. Needed when the kernel wants to access high addresses
24 * directly.
25 *
26 * NOTE! We need to allow non-page-aligned mappings too: we will obviously
27 * have to convert them into an offset in a page-aligned mapping, but the
28 * caller shouldn't need to know that small detail.
29 */
30void __iomem * __ioremap_prot(unsigned long phys_addr, unsigned long size, pgprot_t prot)
31{
32	void __iomem * addr;
33	struct vm_struct * area;
34	unsigned long offset, last_addr;
35
36	/* Don't allow wraparound or zero size */
37	last_addr = phys_addr + size - 1;
38	if (!size || last_addr < phys_addr)
39		return NULL;
40
41	/*
42	 * Mappings have to be page-aligned
43	 */
44	offset = phys_addr & ~PAGE_MASK;
45	phys_addr &= PAGE_MASK;
46	size = PAGE_ALIGN(last_addr+1) - phys_addr;
47
48	/*
49	 * Ok, go for it..
50	 */
51	area = get_vm_area(size, VM_IOREMAP);
52	if (!area)
53		return NULL;
54	addr = (void __iomem *)area->addr;
55	if (ioremap_page_range((unsigned long)addr, (unsigned long)addr + size,
56			       phys_addr, prot)) {
57		vfree((void __force *)addr);
58		return NULL;
59	}
60	return (void __iomem *) (offset + (char __iomem *)addr);
61}
62
63void __iomem * __ioremap(unsigned long phys_addr, unsigned long size, unsigned long flags)
64{
65	return __ioremap_prot(phys_addr, size,
66		              __pgprot(_PAGE_PRESENT | __READABLE |
67				       __WRITEABLE | _PAGE_GLOBAL |
68				       _PAGE_KERNEL | flags));
69}
70
71/**
72 * ioremap_nocache     -   map bus memory into CPU space
73 * @offset:    bus address of the memory
74 * @size:      size of the resource to map
75 *
76 * Must be freed with iounmap.
77 */
78
79void __iomem *ioremap_nocache (unsigned long phys_addr, unsigned long size)
80{
81        return __ioremap(phys_addr | MEM_NON_CACHEABLE, size, 0);
82}
83
84void iounmap(volatile void __iomem *addr)
85{
86	if (addr > high_memory)
87		return vfree((void *) (PAGE_MASK & (unsigned long) addr));
88}
89