Merge branch 'x86-cpu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...
[linux-2.6.git] / arch / arm / plat-mxc / iomux-v3.c
1 /*
2  * Copyright 2004-2006 Freescale Semiconductor, Inc. All Rights Reserved.
3  * Copyright (C) 2008 by Sascha Hauer <kernel@pengutronix.de>
4  * Copyright (C) 2009 by Jan Weitzel Phytec Messtechnik GmbH,
5  *                       <armlinux@phytec.de>
6  *
7  * This program is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU General Public License
9  * as published by the Free Software Foundation; either version 2
10  * of the License, or (at your option) any later version.
11  * This program is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14  * GNU General Public License for more details.
15  *
16  * You should have received a copy of the GNU General Public License
17  * along with this program; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
19  * MA 02110-1301, USA.
20  */
21 #include <linux/errno.h>
22 #include <linux/init.h>
23 #include <linux/kernel.h>
24 #include <linux/module.h>
25 #include <linux/string.h>
26 #include <linux/gpio.h>
27
28 #include <mach/hardware.h>
29 #include <asm/mach/map.h>
30 #include <mach/iomux-v3.h>
31
32 static void __iomem *base;
33
34 static unsigned long iomux_v3_pad_alloc_map[0x200 / BITS_PER_LONG];
35
36 /*
37  * setups a single pin:
38  *      - reserves the pin so that it is not claimed by another driver
39  *      - setups the iomux according to the configuration
40  */
41 int mxc_iomux_v3_setup_pad(struct pad_desc *pad)
42 {
43         unsigned int pad_ofs = pad->pad_ctrl_ofs;
44
45         if (test_and_set_bit(pad_ofs >> 2, iomux_v3_pad_alloc_map))
46                 return -EBUSY;
47         if (pad->mux_ctrl_ofs)
48                 __raw_writel(pad->mux_mode, base + pad->mux_ctrl_ofs);
49
50         if (pad->select_input_ofs)
51                 __raw_writel(pad->select_input,
52                                 base + pad->select_input_ofs);
53
54         if (!(pad->pad_ctrl & NO_PAD_CTRL) && pad->pad_ctrl_ofs)
55                 __raw_writel(pad->pad_ctrl, base + pad->pad_ctrl_ofs);
56         return 0;
57 }
58 EXPORT_SYMBOL(mxc_iomux_v3_setup_pad);
59
60 int mxc_iomux_v3_setup_multiple_pads(struct pad_desc *pad_list, unsigned count)
61 {
62         struct pad_desc *p = pad_list;
63         int i;
64         int ret;
65
66         for (i = 0; i < count; i++) {
67                 ret = mxc_iomux_v3_setup_pad(p);
68                 if (ret)
69                         goto setup_error;
70                 p++;
71         }
72         return 0;
73
74 setup_error:
75         mxc_iomux_v3_release_multiple_pads(pad_list, i);
76         return ret;
77 }
78 EXPORT_SYMBOL(mxc_iomux_v3_setup_multiple_pads);
79
80 void mxc_iomux_v3_release_pad(struct pad_desc *pad)
81 {
82         unsigned int pad_ofs = pad->pad_ctrl_ofs;
83
84         clear_bit(pad_ofs >> 2, iomux_v3_pad_alloc_map);
85 }
86 EXPORT_SYMBOL(mxc_iomux_v3_release_pad);
87
88 void mxc_iomux_v3_release_multiple_pads(struct pad_desc *pad_list, int count)
89 {
90         struct pad_desc *p = pad_list;
91         int i;
92
93         for (i = 0; i < count; i++) {
94                 mxc_iomux_v3_release_pad(p);
95                 p++;
96         }
97 }
98 EXPORT_SYMBOL(mxc_iomux_v3_release_multiple_pads);
99
100 void mxc_iomux_v3_init(void __iomem *iomux_v3_base)
101 {
102         base = iomux_v3_base;
103 }