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/cdefs.h>
29 #include <sys/param.h>
30 #include <sys/systm.h>
31 #include <sys/kernel.h>
32 #include <sys/module.h>
33 #include <sys/bus.h>
34 #include <sys/resource.h>
35 #include <sys/rman.h>
36 #include <sys/lock.h>
37 #include <sys/malloc.h>
38
39 #include <machine/bus.h>
40 #include <machine/resource.h>
41 #include <machine/intr.h>
42 #include <sys/gpio.h>
43
44 #include <dev/ofw/ofw_bus.h>
45 #include <dev/ofw/ofw_bus_subr.h>
46
47 #include <arm/ti/ti_cpuid.h>
48 #include <arm/ti/ti_gpio.h>
49 #include <arm/ti/ti_pinmux.h>
50
51 #include <arm/ti/am335x/am335x_scm_padconf.h>
52
53 #include "ti_gpio_if.h"
54
55 static struct ofw_compat_data compat_data[] = {
56 {"ti,am335x-gpio", 1},
57 /* Linux uses ti,omap4-gpio on am335x so we need to support it */
58 {"ti,omap4-gpio", 1},
59 {"ti,gpio", 1},
60 {NULL, 0},
61 };
62
63 static int
am335x_gpio_probe(device_t dev)64 am335x_gpio_probe(device_t dev)
65 {
66
67 if (!ofw_bus_status_okay(dev))
68 return (ENXIO);
69
70 if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0)
71 return (ENXIO);
72
73 if (ti_chip() != CHIP_AM335X)
74 return (ENXIO);
75
76 device_set_desc(dev, "TI AM335x General Purpose I/O (GPIO)");
77
78 return (0);
79 }
80
81 static int
am335x_gpio_set_flags(device_t dev,uint32_t gpio,uint32_t flags)82 am335x_gpio_set_flags(device_t dev, uint32_t gpio, uint32_t flags)
83 {
84 unsigned int state = 0;
85 struct ti_gpio_softc *sc = device_get_softc(dev);
86
87 if (flags & GPIO_PIN_OUTPUT) {
88 if (flags & GPIO_PIN_PULLUP)
89 state = PADCONF_OUTPUT_PULLUP;
90 else
91 state = PADCONF_OUTPUT;
92 } else if (flags & GPIO_PIN_INPUT) {
93 if (flags & GPIO_PIN_PULLUP)
94 state = PADCONF_INPUT_PULLUP;
95 else if (flags & GPIO_PIN_PULLDOWN)
96 state = PADCONF_INPUT_PULLDOWN;
97 else
98 state = PADCONF_INPUT;
99 }
100 return ti_pinmux_padconf_set_gpiomode(sc->sc_bank*32 + gpio, state);
101 }
102
103 static int
am335x_gpio_get_flags(device_t dev,uint32_t gpio,uint32_t * flags)104 am335x_gpio_get_flags(device_t dev, uint32_t gpio, uint32_t *flags)
105 {
106 unsigned int state;
107 struct ti_gpio_softc *sc = device_get_softc(dev);
108
109 if (ti_pinmux_padconf_get_gpiomode(sc->sc_bank*32 + gpio, &state) != 0) {
110 *flags = 0;
111 return (EINVAL);
112 } else {
113 switch (state) {
114 case PADCONF_OUTPUT:
115 *flags = GPIO_PIN_OUTPUT;
116 break;
117 case PADCONF_OUTPUT_PULLUP:
118 *flags = GPIO_PIN_OUTPUT | GPIO_PIN_PULLUP;
119 break;
120 case PADCONF_INPUT:
121 *flags = GPIO_PIN_INPUT;
122 break;
123 case PADCONF_INPUT_PULLUP:
124 *flags = GPIO_PIN_INPUT | GPIO_PIN_PULLUP;
125 break;
126 case PADCONF_INPUT_PULLDOWN:
127 *flags = GPIO_PIN_INPUT | GPIO_PIN_PULLDOWN;
128 break;
129 default:
130 *flags = 0;
131 break;
132 }
133 }
134
135 return (0);
136 }
137
138 static device_method_t am335x_gpio_methods[] = {
139 /* bus interface */
140 DEVMETHOD(device_probe, am335x_gpio_probe),
141
142 /* ti_gpio interface */
143 DEVMETHOD(ti_gpio_set_flags, am335x_gpio_set_flags),
144 DEVMETHOD(ti_gpio_get_flags, am335x_gpio_get_flags),
145
146 DEVMETHOD_END
147 };
148
149 extern driver_t ti_gpio_driver;
150 static devclass_t am335x_gpio_devclass;
151
152 DEFINE_CLASS_1(gpio, am335x_gpio_driver, am335x_gpio_methods,
153 sizeof(struct ti_gpio_softc), ti_gpio_driver);
154 DRIVER_MODULE(am335x_gpio, simplebus, am335x_gpio_driver, am335x_gpio_devclass,
155 0, 0);
156 MODULE_DEPEND(am335x_gpio, ti_sysc, 1, 1, 1);
157