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
|
/*-
* Copyright (c) 2011 Ben Gray <ben.r.gray@gmail.com>.
* Copyright (c) 2014 Andrew Turner <andrew@FreeBSD.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the company nor the name of the author may be used to
* endorse or promote products derived from this software without specific
* prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY BEN GRAY ``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 BEN GRAY 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/bus.h>
#include <sys/gpio.h>
#include <machine/bus.h>
#include <machine/intr.h>
#include <dev/ofw/ofw_bus.h>
#include <dev/ofw/ofw_bus_subr.h>
#include <arm/ti/ti_cpuid.h>
#include <arm/ti/ti_gpio.h>
#include <arm/ti/ti_pinmux.h>
#include <arm/ti/omap4/omap4_scm_padconf.h>
#include "ti_gpio_if.h"
static struct ofw_compat_data compat_data[] = {
{"ti,omap4-gpio", 1},
{"ti,gpio", 1},
{NULL, 0},
};
static int
omap4_gpio_probe(device_t dev)
{
if (!ofw_bus_status_okay(dev))
return (ENXIO);
if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0)
return (ENXIO);
if (ti_chip() != CHIP_OMAP_4)
return (ENXIO);
device_set_desc(dev, "TI OMAP4 General Purpose I/O (GPIO)");
return (0);
}
static int
omap4_gpio_set_flags(device_t dev, uint32_t gpio, uint32_t flags)
{
unsigned int state = 0;
struct ti_gpio_softc *sc;
sc = device_get_softc(dev);
/* First the SCM driver needs to be told to put the pad into GPIO mode */
if (flags & GPIO_PIN_OUTPUT)
state = PADCONF_PIN_OUTPUT;
else if (flags & GPIO_PIN_INPUT) {
if (flags & GPIO_PIN_PULLUP)
state = PADCONF_PIN_INPUT_PULLUP;
else if (flags & GPIO_PIN_PULLDOWN)
state = PADCONF_PIN_INPUT_PULLDOWN;
else
state = PADCONF_PIN_INPUT;
}
return ti_pinmux_padconf_set_gpiomode((sc->sc_bank-1)*32 + gpio, state);
}
static int
omap4_gpio_get_flags(device_t dev, uint32_t gpio, uint32_t *flags)
{
unsigned int state;
struct ti_gpio_softc *sc;
sc = device_get_softc(dev);
/* Get the current pin state */
if (ti_pinmux_padconf_get_gpiomode((sc->sc_bank-1)*32 + gpio, &state) != 0) {
*flags = 0;
return (EINVAL);
} else {
switch (state) {
case PADCONF_PIN_OUTPUT:
*flags = GPIO_PIN_OUTPUT;
break;
case PADCONF_PIN_INPUT:
*flags = GPIO_PIN_INPUT;
break;
case PADCONF_PIN_INPUT_PULLUP:
*flags = GPIO_PIN_INPUT | GPIO_PIN_PULLUP;
break;
case PADCONF_PIN_INPUT_PULLDOWN:
*flags = GPIO_PIN_INPUT | GPIO_PIN_PULLDOWN;
break;
default:
*flags = 0;
break;
}
}
return (0);
}
static device_method_t omap4_gpio_methods[] = {
/* bus interface */
DEVMETHOD(device_probe, omap4_gpio_probe),
/* ti_gpio interface */
DEVMETHOD(ti_gpio_set_flags, omap4_gpio_set_flags),
DEVMETHOD(ti_gpio_get_flags, omap4_gpio_get_flags),
DEVMETHOD_END
};
extern driver_t ti_gpio_driver;
static devclass_t omap4_gpio_devclass;
DEFINE_CLASS_1(gpio, omap4_gpio_driver, omap4_gpio_methods,
sizeof(struct ti_gpio_softc), ti_gpio_driver);
DRIVER_MODULE(omap4_gpio, simplebus, omap4_gpio_driver, omap4_gpio_devclass,
0, 0);
|
