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
ioremap_nocache(unsigned long phys_addr,unsigned long size)24 void __iomem *ioremap_nocache(unsigned long phys_addr, unsigned long size)
25 {
26 unsigned long last_addr, addr;
27 unsigned long offset = phys_addr & ~PAGE_MASK;
28 struct vm_struct *area;
29
30 pgprot_t prot = __pgprot(_PAGE_PRESENT|_PAGE_READ|_PAGE_WRITE
31 |(__HEXAGON_C_DEV << 6));
32
33 last_addr = phys_addr + size - 1;
34
35 /* Wrapping not allowed */
36 if (!size || (last_addr < phys_addr))
37 return NULL;
38
39 /* Rounds up to next page size, including whole-page offset */
40 size = PAGE_ALIGN(offset + size);
41
42 area = get_vm_area(size, VM_IOREMAP);
43 addr = (unsigned long)area->addr;
44
45 if (ioremap_page_range(addr, addr+size, phys_addr, prot)) {
46 vunmap((void *)addr);
47 return NULL;
48 }
49
50 return (void __iomem *) (offset + addr);
51 }
52
__iounmap(const volatile void __iomem * addr)53 void __iounmap(const volatile void __iomem *addr)
54 {
55 vunmap((void *) ((unsigned long) addr & PAGE_MASK));
56 }
57