summaryrefslogtreecommitdiff
path: root/arch/mips/au1000/common/gpio.c
blob: b485d94ce8a5055d4e28b35f8dec1c7fc3b2af9e (plain)
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
/*
 *  Copyright (C) 2007, OpenWrt.org, Florian Fainelli <florian@openwrt.org>
 *  	Architecture specific GPIO support
 *
 *  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  SOFTWARE  IS PROVIDED	  ``AS	IS'' AND   ANY	EXPRESS OR IMPLIED
 *  WARRANTIES,	  INCLUDING, BUT NOT  LIMITED  TO, THE IMPLIED WARRANTIES OF
 *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
 *  NO	EVENT  SHALL   THE AUTHOR  BE	 LIABLE FOR ANY	  DIRECT, INDIRECT,
 *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 *  NOT LIMITED	  TO, PROCUREMENT OF  SUBSTITUTE GOODS	OR SERVICES; LOSS OF
 *  USE, DATA,	OR PROFITS; OR	BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 *  ANY THEORY OF LIABILITY, WHETHER IN	 CONTRACT, STRICT LIABILITY, OR TORT
 *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 *  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.,
 *  675 Mass Ave, Cambridge, MA 02139, USA.
 *
 *  Notes :
 * 	au1000 SoC have only one GPIO line : GPIO1
 * 	others have a second one : GPIO2
 */

#include <linux/module.h>

#include <asm/mach-au1x00/au1000.h>
#include <asm/gpio.h>

#define gpio1 sys
#if !defined(CONFIG_SOC_AU1000)

static struct au1x00_gpio2 *const gpio2 = (struct au1x00_gpio2 *) GPIO2_BASE;
#define GPIO2_OUTPUT_ENABLE_MASK 	0x00010000

static int au1xxx_gpio2_read(unsigned gpio)
{
	gpio -= AU1XXX_GPIO_BASE;
	return ((gpio2->pinstate >> gpio) & 0x01);
}

static void au1xxx_gpio2_write(unsigned gpio, int value)
{
	gpio -= AU1XXX_GPIO_BASE;

	gpio2->output = (GPIO2_OUTPUT_ENABLE_MASK << gpio) | (value << gpio);
}

static int au1xxx_gpio2_direction_input(unsigned gpio)
{
	gpio -= AU1XXX_GPIO_BASE;
	gpio2->dir &= ~(0x01 << gpio);
	return 0;
}

static int au1xxx_gpio2_direction_output(unsigned gpio, int value)
{
	gpio -= AU1XXX_GPIO_BASE;
	gpio2->dir = (0x01 << gpio) | (value << gpio);
	return 0;
}

#endif /* !defined(CONFIG_SOC_AU1000) */

static int au1xxx_gpio1_read(unsigned gpio)
{
	return (gpio1->pinstaterd >> gpio) & 0x01;
}

static void au1xxx_gpio1_write(unsigned gpio, int value)
{
	if (value)
		gpio1->outputset = (0x01 << gpio);
	else
		/* Output a zero */
		gpio1->outputclr = (0x01 << gpio);
}

static int au1xxx_gpio1_direction_input(unsigned gpio)
{
	gpio1->pininputen = (0x01 << gpio);
	return 0;
}

static int au1xxx_gpio1_direction_output(unsigned gpio, int value)
{
	gpio1->trioutclr = (0x01 & gpio);
	return 0;
}

int au1xxx_gpio_get_value(unsigned gpio)
{
	if (gpio >= AU1XXX_GPIO_BASE)
#if defined(CONFIG_SOC_AU1000)
		return 0;
#else
		return au1xxx_gpio2_read(gpio);
#endif
	else
		return au1xxx_gpio1_read(gpio);
}
EXPORT_SYMBOL(au1xxx_gpio_get_value);

void au1xxx_gpio_set_value(unsigned gpio, int value)
{
	if (gpio >= AU1XXX_GPIO_BASE)
#if defined(CONFIG_SOC_AU1000)
		;
#else
		au1xxx_gpio2_write(gpio, value);
#endif
	else
		au1xxx_gpio1_write(gpio, value);
}
EXPORT_SYMBOL(au1xxx_gpio_set_value);

int au1xxx_gpio_direction_input(unsigned gpio)
{
	if (gpio >= AU1XXX_GPIO_BASE)
#if defined(CONFIG_SOC_AU1000)
		return -ENODEV;
#else
		return au1xxx_gpio2_direction_input(gpio);
#endif

	return au1xxx_gpio1_direction_input(gpio);
}
EXPORT_SYMBOL(au1xxx_gpio_direction_input);

int au1xxx_gpio_direction_output(unsigned gpio, int value)
{
	if (gpio >= AU1XXX_GPIO_BASE)
#if defined(CONFIG_SOC_AU1000)
		return -ENODEV;
#else
		return au1xxx_gpio2_direction_output(gpio, value);
#endif

	return au1xxx_gpio1_direction_output(gpio, value);
}
EXPORT_SYMBOL(au1xxx_gpio_direction_output);