1/*
2 * I/O remap functions for Hexagon
3 *
4 * Copyright (c) 2010-2011, The Linux Foundation. All rights reserved.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 and
8 * only version 2 as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
18 * 02110-1301, USA.
19 */
20
21#include <linux/io.h>
22#include <linux/vmalloc.h>
23#include <linux/mm.h>
24
25void __iomem *ioremap_nocache(unsigned long phys_addr, unsigned long size)
26{
27	unsigned long last_addr, addr;
28	unsigned long offset = phys_addr & ~PAGE_MASK;
29	struct vm_struct *area;
30
31	pgprot_t prot = __pgprot(_PAGE_PRESENT|_PAGE_READ|_PAGE_WRITE
32					|(__HEXAGON_C_DEV << 6));
33
34	last_addr = phys_addr + size - 1;
35
36	/*  Wrapping not allowed  */
37	if (!size || (last_addr < phys_addr))
38		return NULL;
39
40	/*  Rounds up to next page size, including whole-page offset */
41	size = PAGE_ALIGN(offset + size);
42
43	area = get_vm_area(size, VM_IOREMAP);
44	addr = (unsigned long)area->addr;
45
46	if (ioremap_page_range(addr, addr+size, phys_addr, prot)) {
47		vunmap((void *)addr);
48		return NULL;
49	}
50
51	return (void __iomem *) (offset + addr);
52}
53
54void __iounmap(const volatile void __iomem *addr)
55{
56	vunmap((void *) ((unsigned long) addr & PAGE_MASK));
57}
58