blob: 851ca99bf1b1f58f22fd4db9833a2e8ef1f9e13d [file] [log] [blame]
Sascha Hauerbca6ef12009-04-01 11:11:48 +02001/*
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
Sascha Hauer6134b2c2009-06-04 11:16:22 +020032static void __iomem *base;
Sascha Hauerbca6ef12009-04-01 11:11:48 +020033
34static 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 */
41int 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)
Sascha Hauer6134b2c2009-06-04 11:16:22 +020048 __raw_writel(pad->mux_mode, base + pad->mux_ctrl_ofs);
Sascha Hauerbca6ef12009-04-01 11:11:48 +020049
50 if (pad->select_input_ofs)
51 __raw_writel(pad->select_input,
Sascha Hauer6134b2c2009-06-04 11:16:22 +020052 base + pad->select_input_ofs);
Sascha Hauerbca6ef12009-04-01 11:11:48 +020053
Sascha Hauer6134b2c2009-06-04 11:16:22 +020054 if (!(pad->pad_ctrl & NO_PAD_CTRL) && pad->pad_ctrl_ofs)
55 __raw_writel(pad->pad_ctrl, base + pad->pad_ctrl_ofs);
Sascha Hauerbca6ef12009-04-01 11:11:48 +020056 return 0;
57}
58EXPORT_SYMBOL(mxc_iomux_v3_setup_pad);
59
60int 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
74setup_error:
75 mxc_iomux_v3_release_multiple_pads(pad_list, i);
76 return ret;
77}
78EXPORT_SYMBOL(mxc_iomux_v3_setup_multiple_pads);
79
80void 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}
86EXPORT_SYMBOL(mxc_iomux_v3_release_pad);
87
88void 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}
98EXPORT_SYMBOL(mxc_iomux_v3_release_multiple_pads);
Sascha Hauer6134b2c2009-06-04 11:16:22 +020099
100void mxc_iomux_v3_init(void __iomem *iomux_v3_base)
101{
102 base = iomux_v3_base;
103}