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