1 /*-
2 * Copyright (c) 2012 Damjan Marion <dmarion@FreeBSD.org>
3 * Copyright (c) 2014 Andrew Turner <andrew@FreeBSD.org>
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 */
27
28 #include <sys/param.h>
29 #include <sys/systm.h>
30 #include <sys/kernel.h>
31 #include <sys/module.h>
32 #include <sys/bus.h>
33 #include <sys/resource.h>
34 #include <sys/rman.h>
35 #include <sys/lock.h>
36 #include <sys/malloc.h>
37
38 #include <machine/bus.h>
39 #include <machine/resource.h>
40 #include <machine/intr.h>
41 #include <sys/gpio.h>
42
43 #include <dev/ofw/ofw_bus.h>
44 #include <dev/ofw/ofw_bus_subr.h>
45
46 #include <arm/ti/ti_cpuid.h>
47 #include <arm/ti/ti_gpio.h>
48 #include <arm/ti/ti_pinmux.h>
49
50 #include <arm/ti/am335x/am335x_scm_padconf.h>
51
52 #include "ti_gpio_if.h"
53
54 static struct ofw_compat_data compat_data[] = {
55 {"ti,am335x-gpio", 1},
56 /* Linux uses ti,omap4-gpio on am335x so we need to support it */
57 {"ti,omap4-gpio", 1},
58 {"ti,gpio", 1},
59 {NULL, 0},
60 };
61
62 static int
am335x_gpio_probe(device_t dev)63 am335x_gpio_probe(device_t dev)
64 {
65
66 if (!ofw_bus_status_okay(dev))
67 return (ENXIO);
68
69 if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0)
70 return (ENXIO);
71
72 if (ti_chip() != CHIP_AM335X)
73 return (ENXIO);
74
75 device_set_desc(dev, "TI AM335x General Purpose I/O (GPIO)");
76
77 return (0);
78 }
79
80 static int
am335x_gpio_set_flags(device_t dev,uint32_t gpio,uint32_t flags)81 am335x_gpio_set_flags(device_t dev, uint32_t gpio, uint32_t flags)
82 {
83 unsigned int state = 0;
84 struct ti_gpio_softc *sc = device_get_softc(dev);
85
86 if (flags & GPIO_PIN_OUTPUT) {
87 if (flags & GPIO_PIN_PULLUP)
88 state = PADCONF_OUTPUT_PULLUP;
89 else
90 state = PADCONF_OUTPUT;
91 } else if (flags & GPIO_PIN_INPUT) {
92 if (flags & GPIO_PIN_PULLUP)
93 state = PADCONF_INPUT_PULLUP;
94 else if (flags & GPIO_PIN_PULLDOWN)
95 state = PADCONF_INPUT_PULLDOWN;
96 else
97 state = PADCONF_INPUT;
98 }
99 return ti_pinmux_padconf_set_gpiomode(sc->sc_bank*32 + gpio, state);
100 }
101
102 static int
am335x_gpio_get_flags(device_t dev,uint32_t gpio,uint32_t * flags)103 am335x_gpio_get_flags(device_t dev, uint32_t gpio, uint32_t *flags)
104 {
105 unsigned int state;
106 struct ti_gpio_softc *sc = device_get_softc(dev);
107
108 if (ti_pinmux_padconf_get_gpiomode(sc->sc_bank*32 + gpio, &state) != 0) {
109 *flags = 0;
110 return (EINVAL);
111 } else {
112 switch (state) {
113 case PADCONF_OUTPUT:
114 *flags = GPIO_PIN_OUTPUT;
115 break;
116 case PADCONF_OUTPUT_PULLUP:
117 *flags = GPIO_PIN_OUTPUT | GPIO_PIN_PULLUP;
118 break;
119 case PADCONF_INPUT:
120 *flags = GPIO_PIN_INPUT;
121 break;
122 case PADCONF_INPUT_PULLUP:
123 *flags = GPIO_PIN_INPUT | GPIO_PIN_PULLUP;
124 break;
125 case PADCONF_INPUT_PULLDOWN:
126 *flags = GPIO_PIN_INPUT | GPIO_PIN_PULLDOWN;
127 break;
128 default:
129 *flags = 0;
130 break;
131 }
132 }
133
134 return (0);
135 }
136
137 static device_method_t am335x_gpio_methods[] = {
138 /* bus interface */
139 DEVMETHOD(device_probe, am335x_gpio_probe),
140
141 /* ti_gpio interface */
142 DEVMETHOD(ti_gpio_set_flags, am335x_gpio_set_flags),
143 DEVMETHOD(ti_gpio_get_flags, am335x_gpio_get_flags),
144
145 DEVMETHOD_END
146 };
147
148 extern driver_t ti_gpio_driver;
149
150 DEFINE_CLASS_1(gpio, am335x_gpio_driver, am335x_gpio_methods,
151 sizeof(struct ti_gpio_softc), ti_gpio_driver);
152 DRIVER_MODULE(am335x_gpio, simplebus, am335x_gpio_driver, 0, 0);
153 MODULE_DEPEND(am335x_gpio, ti_sysc, 1, 1, 1);
154