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 __FBSDID("$FreeBSD$");
30
31 #include <sys/param.h>
32 #include <sys/systm.h>
33 #include <sys/kernel.h>
34 #include <sys/module.h>
35 #include <sys/bus.h>
36 #include <sys/resource.h>
37 #include <sys/rman.h>
38 #include <sys/lock.h>
39 #include <sys/malloc.h>
40
41 #include <machine/bus.h>
42 #include <machine/cpu.h>
43 #include <machine/cpufunc.h>
44 #include <machine/resource.h>
45 #include <machine/intr.h>
46 #include <sys/gpio.h>
47
48 #include <dev/fdt/fdt_common.h>
49 #include <dev/ofw/ofw_bus.h>
50 #include <dev/ofw/ofw_bus_subr.h>
51
52 #include <arm/ti/ti_cpuid.h>
53 #include <arm/ti/ti_gpio.h>
54 #include <arm/ti/ti_pinmux.h>
55
56 #include <arm/ti/am335x/am335x_scm_padconf.h>
57
58 #include "ti_gpio_if.h"
59
60 static struct ofw_compat_data compat_data[] = {
61 {"ti,am335x-gpio", 1},
62 /* Linux uses ti,omap4-gpio on am335x so we need to support it */
63 {"ti,omap4-gpio", 1},
64 {"ti,gpio", 1},
65 {NULL, 0},
66 };
67
68 static int
am335x_gpio_probe(device_t dev)69 am335x_gpio_probe(device_t dev)
70 {
71 if (ti_chip() != CHIP_AM335X)
72 return (ENXIO);
73
74 if (!ofw_bus_status_okay(dev))
75 return (ENXIO);
76
77 if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0)
78 return (ENXIO);
79
80 device_set_desc(dev, "TI AM335x General Purpose I/O (GPIO)");
81
82 return (0);
83 }
84
85 static int
am335x_gpio_set_flags(device_t dev,uint32_t gpio,uint32_t flags)86 am335x_gpio_set_flags(device_t dev, uint32_t gpio, uint32_t flags)
87 {
88 unsigned int state = 0;
89 struct ti_gpio_softc *sc = device_get_softc(dev);
90
91 if (flags & GPIO_PIN_OUTPUT) {
92 if (flags & GPIO_PIN_PULLUP)
93 state = PADCONF_OUTPUT_PULLUP;
94 else
95 state = PADCONF_OUTPUT;
96 } else if (flags & GPIO_PIN_INPUT) {
97 if (flags & GPIO_PIN_PULLUP)
98 state = PADCONF_INPUT_PULLUP;
99 else if (flags & GPIO_PIN_PULLDOWN)
100 state = PADCONF_INPUT_PULLDOWN;
101 else
102 state = PADCONF_INPUT;
103 }
104 return ti_pinmux_padconf_set_gpiomode(sc->sc_bank*32 + gpio, state);
105 }
106
107 static int
am335x_gpio_get_flags(device_t dev,uint32_t gpio,uint32_t * flags)108 am335x_gpio_get_flags(device_t dev, uint32_t gpio, uint32_t *flags)
109 {
110 unsigned int state;
111 struct ti_gpio_softc *sc = device_get_softc(dev);
112
113 if (ti_pinmux_padconf_get_gpiomode(sc->sc_bank*32 + gpio, &state) != 0) {
114 *flags = 0;
115 return (EINVAL);
116 } else {
117 switch (state) {
118 case PADCONF_OUTPUT:
119 *flags = GPIO_PIN_OUTPUT;
120 break;
121 case PADCONF_OUTPUT_PULLUP:
122 *flags = GPIO_PIN_OUTPUT | GPIO_PIN_PULLUP;
123 break;
124 case PADCONF_INPUT:
125 *flags = GPIO_PIN_INPUT;
126 break;
127 case PADCONF_INPUT_PULLUP:
128 *flags = GPIO_PIN_INPUT | GPIO_PIN_PULLUP;
129 break;
130 case PADCONF_INPUT_PULLDOWN:
131 *flags = GPIO_PIN_INPUT | GPIO_PIN_PULLDOWN;
132 break;
133 default:
134 *flags = 0;
135 break;
136 }
137 }
138
139 return (0);
140 }
141
142 static device_method_t am335x_gpio_methods[] = {
143 /* bus interface */
144 DEVMETHOD(device_probe, am335x_gpio_probe),
145
146 /* ti_gpio interface */
147 DEVMETHOD(ti_gpio_set_flags, am335x_gpio_set_flags),
148 DEVMETHOD(ti_gpio_get_flags, am335x_gpio_get_flags),
149
150 DEVMETHOD_END
151 };
152
153 extern driver_t ti_gpio_driver;
154 static devclass_t am335x_gpio_devclass;
155
156 DEFINE_CLASS_1(gpio, am335x_gpio_driver, am335x_gpio_methods,
157 sizeof(struct ti_gpio_softc), ti_gpio_driver);
158 DRIVER_MODULE(am335x_gpio, simplebus, am335x_gpio_driver, am335x_gpio_devclass,
159 0, 0);
160