Linux Kernel  3.7.1
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ioremap.c
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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 
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 
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 
53 void __iounmap(const volatile void __iomem *addr)
54 {
55  vunmap((void *) ((unsigned long) addr & PAGE_MASK));
56 }