aboutsummaryrefslogtreecommitdiffstats
path: root/arch/arm/mach-imx/iomux-v1.c
blob: ecd543664644135084e37d88002ecee88fa2d15a (plain) (blame)
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
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
/*
 * arch/arm/plat-mxc/iomux-v1.c
 *
 * Copyright (C) 2004 Sascha Hauer, Synertronixx GmbH
 * Copyright (C) 2009 Uwe Kleine-Koenig, Pengutronix
 *
 * Common code for i.MX1, i.MX21 and i.MX27
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * 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 St, Fifth Floor, Boston, MA 02110-1301, USA.
 */

#include <linux/errno.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/string.h>
#include <linux/gpio.h>

#include <asm/mach/map.h>

#include "hardware.h"
#include "iomux-v1.h"

static void __iomem *imx_iomuxv1_baseaddr;
static unsigned imx_iomuxv1_numports;

static inline unsigned long imx_iomuxv1_readl(unsigned offset)
{
	return __raw_readl(imx_iomuxv1_baseaddr + offset);
}

static inline void imx_iomuxv1_writel(unsigned long val, unsigned offset)
{
	__raw_writel(val, imx_iomuxv1_baseaddr + offset);
}

static inline void imx_iomuxv1_rmwl(unsigned offset,
		unsigned long mask, unsigned long value)
{
	unsigned long reg = imx_iomuxv1_readl(offset);

	reg &= ~mask;
	reg |= value;

	imx_iomuxv1_writel(reg, offset);
}

static inline void imx_iomuxv1_set_puen(
		unsigned int port, unsigned int pin, int on)
{
	unsigned long mask = 1 << pin;

	imx_iomuxv1_rmwl(MXC_PUEN(port), mask, on ? mask : 0);
}

static inline void imx_iomuxv1_set_ddir(
		unsigned int port, unsigned int pin, int out)
{
	unsigned long mask = 1 << pin;

	imx_iomuxv1_rmwl(MXC_DDIR(port), mask, out ? mask : 0);
}

static inline void imx_iomuxv1_set_gpr(
		unsigned int port, unsigned int pin, int af)
{
	unsigned long mask = 1 << pin;

	imx_iomuxv1_rmwl(MXC_GPR(port), mask, af ? mask : 0);
}

static inline void imx_iomuxv1_set_gius(
		unsigned int port, unsigned int pin, int inuse)
{
	unsigned long mask = 1 << pin;

	imx_iomuxv1_rmwl(MXC_GIUS(port), mask, inuse ? mask : 0);
}

static inline void imx_iomuxv1_set_ocr(
		unsigned int port, unsigned int pin, unsigned int ocr)
{
	unsigned long shift = (pin & 0xf) << 1;
	unsigned long mask = 3 << shift;
	unsigned long value = ocr << shift;
	unsigned long offset = pin < 16 ? MXC_OCR1(port) : MXC_OCR2(port);

	imx_iomuxv1_rmwl(offset, mask, value);
}

static inline void imx_iomuxv1_set_iconfa(
		unsigned int port, unsigned int pin, unsigned int aout)
{
	unsigned long shift = (pin & 0xf) << 1;
	unsigned long mask = 3 << shift;
	unsigned long value = aout << shift;
	unsigned long offset = pin < 16 ? MXC_ICONFA1(port) : MXC_ICONFA2(port);

	imx_iomuxv1_rmwl(offset, mask, value);
}

static inline void imx_iomuxv1_set_iconfb(
		unsigned int port, unsigned int pin, unsigned int bout)
{
	unsigned long shift = (pin & 0xf) << 1;
	unsigned long mask = 3 << shift;
	unsigned long value = bout << shift;
	unsigned long offset = pin < 16 ? MXC_ICONFB1(port) : MXC_ICONFB2(port);

	imx_iomuxv1_rmwl(offset, mask, value);
}

int mxc_gpio_mode(int gpio_mode)
{
	unsigned int pin = gpio_mode & GPIO_PIN_MASK;
	unsigned int port = (gpio_mode & GPIO_PORT_MASK) >> GPIO_PORT_SHIFT;
	unsigned int ocr = (gpio_mode & GPIO_OCR_MASK) >> GPIO_OCR_SHIFT;
	unsigned int aout = (gpio_mode >> GPIO_AOUT_SHIFT) & 3;
	unsigned int bout = (gpio_mode >> GPIO_BOUT_SHIFT) & 3;

	if (port >= imx_iomuxv1_numports)
		return -EINVAL;

	/* Pullup enable */
	imx_iomuxv1_set_puen(port, pin, gpio_mode & GPIO_PUEN);

	/* Data direction */
	imx_iomuxv1_set_ddir(port, pin, gpio_mode & GPIO_OUT);

	/* Primary / alternate function */
	imx_iomuxv1_set_gpr(port, pin, gpio_mode & GPIO_AF);

	/* use as gpio? */
	imx_iomuxv1_set_gius(port, pin, !(gpio_mode & (GPIO_PF | GPIO_AF)));

	imx_iomuxv1_set_ocr(port, pin, ocr);

	imx_iomuxv1_set_iconfa(port, pin, aout);

	imx_iomuxv1_set_iconfb(port, pin, bout);

	return 0;
}

static int imx_iomuxv1_setup_multiple(const int *list, unsigned count)
{
	size_t i;
	int ret = 0;

	for (i = 0; i < count; ++i) {
		ret = mxc_gpio_mode(list[i]);

		if (ret)
			return ret;
	}

	return ret;
}

int mxc_gpio_setup_multiple_pins(const int *pin_list, unsigned count,
		const char *label)
{
	int ret;

	ret = imx_iomuxv1_setup_multiple(pin_list, count);
	return ret;
}

int __init imx_iomuxv1_init(void __iomem *base, int numports)
{
	imx_iomuxv1_baseaddr = base;
	imx_iomuxv1_numports = numports;

	return 0;
}