Linux Kernel  3.7.1
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
io.c
Go to the documentation of this file.
1 /*
2  * I/O access 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 <asm/io.h>
22 
23 /* These are all FIFO routines! */
24 
25 /*
26  * __raw_readsw - read words a short at a time
27  * @addr: source address
28  * @data: data address
29  * @len: number of shorts to read
30  */
31 void __raw_readsw(const void __iomem *addr, void *data, int len)
32 {
33  const volatile short int *src = (short int *) addr;
34  short int *dst = (short int *) data;
35 
36  if ((u32)data & 0x1)
37  panic("unaligned pointer to readsw");
38 
39  while (len-- > 0)
40  *dst++ = *src;
41 
42 }
43 
44 /*
45  * __raw_writesw - read words a short at a time
46  * @addr: source address
47  * @data: data address
48  * @len: number of shorts to read
49  */
50 void __raw_writesw(void __iomem *addr, const void *data, int len)
51 {
52  const short int *src = (short int *)data;
53  volatile short int *dst = (short int *)addr;
54 
55  if ((u32)data & 0x1)
56  panic("unaligned pointer to writesw");
57 
58  while (len-- > 0)
59  *dst = *src++;
60 
61 
62 }
63 
64 /* Pretty sure len is pre-adjusted for the length of the access already */
65 void __raw_readsl(const void __iomem *addr, void *data, int len)
66 {
67  const volatile long *src = (long *) addr;
68  long *dst = (long *) data;
69 
70  if ((u32)data & 0x3)
71  panic("unaligned pointer to readsl");
72 
73  while (len-- > 0)
74  *dst++ = *src;
75 
76 
77 }
78 
79 void __raw_writesl(void __iomem *addr, const void *data, int len)
80 {
81  const long *src = (long *)data;
82  volatile long *dst = (long *)addr;
83 
84  if ((u32)data & 0x3)
85  panic("unaligned pointer to writesl");
86 
87  while (len-- > 0)
88  *dst = *src++;
89 
90 
91 }