1 /*-
2 * Copyright (c) 2011 Ben Gray <ben.r.gray@gmail.com>.
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 * 3. The name of the company nor the name of the author may be used to
15 * endorse or promote products derived from this software without specific
16 * prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY BEN GRAY ``AS IS'' AND ANY EXPRESS OR
19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21 * IN NO EVENT SHALL BEN GRAY BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
22 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
23 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
24 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
25 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
26 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
27 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 */
29
30 #include <sys/param.h>
31 #include <sys/systm.h>
32 #include <sys/kernel.h>
33 #include <sys/module.h>
34 #include <sys/bus.h>
35 #include <sys/gpio.h>
36
37 #include <machine/bus.h>
38 #include <machine/intr.h>
39
40 #include <dev/ofw/ofw_bus.h>
41 #include <dev/ofw/ofw_bus_subr.h>
42
43 #include <arm/ti/ti_cpuid.h>
44 #include <arm/ti/ti_gpio.h>
45 #include <arm/ti/ti_pinmux.h>
46
47 #include <arm/ti/omap4/omap4_scm_padconf.h>
48
49 #include "ti_gpio_if.h"
50
51 static struct ofw_compat_data compat_data[] = {
52 {"ti,omap4-gpio", 1},
53 {"ti,gpio", 1},
54 {NULL, 0},
55 };
56
57 static int
omap4_gpio_probe(device_t dev)58 omap4_gpio_probe(device_t dev)
59 {
60
61 if (!ofw_bus_status_okay(dev))
62 return (ENXIO);
63
64 if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0)
65 return (ENXIO);
66 if (ti_chip() != CHIP_OMAP_4)
67 return (ENXIO);
68
69 device_set_desc(dev, "TI OMAP4 General Purpose I/O (GPIO)");
70
71 return (0);
72 }
73
74 static int
omap4_gpio_set_flags(device_t dev,uint32_t gpio,uint32_t flags)75 omap4_gpio_set_flags(device_t dev, uint32_t gpio, uint32_t flags)
76 {
77 unsigned int state = 0;
78 struct ti_gpio_softc *sc;
79
80 sc = device_get_softc(dev);
81 /* First the SCM driver needs to be told to put the pad into GPIO mode */
82 if (flags & GPIO_PIN_OUTPUT)
83 state = PADCONF_PIN_OUTPUT;
84 else if (flags & GPIO_PIN_INPUT) {
85 if (flags & GPIO_PIN_PULLUP)
86 state = PADCONF_PIN_INPUT_PULLUP;
87 else if (flags & GPIO_PIN_PULLDOWN)
88 state = PADCONF_PIN_INPUT_PULLDOWN;
89 else
90 state = PADCONF_PIN_INPUT;
91 }
92 return ti_pinmux_padconf_set_gpiomode((sc->sc_bank-1)*32 + gpio, state);
93 }
94
95 static int
omap4_gpio_get_flags(device_t dev,uint32_t gpio,uint32_t * flags)96 omap4_gpio_get_flags(device_t dev, uint32_t gpio, uint32_t *flags)
97 {
98 unsigned int state;
99 struct ti_gpio_softc *sc;
100
101 sc = device_get_softc(dev);
102
103 /* Get the current pin state */
104 if (ti_pinmux_padconf_get_gpiomode((sc->sc_bank-1)*32 + gpio, &state) != 0) {
105 *flags = 0;
106 return (EINVAL);
107 } else {
108 switch (state) {
109 case PADCONF_PIN_OUTPUT:
110 *flags = GPIO_PIN_OUTPUT;
111 break;
112 case PADCONF_PIN_INPUT:
113 *flags = GPIO_PIN_INPUT;
114 break;
115 case PADCONF_PIN_INPUT_PULLUP:
116 *flags = GPIO_PIN_INPUT | GPIO_PIN_PULLUP;
117 break;
118 case PADCONF_PIN_INPUT_PULLDOWN:
119 *flags = GPIO_PIN_INPUT | GPIO_PIN_PULLDOWN;
120 break;
121 default:
122 *flags = 0;
123 break;
124 }
125 }
126
127 return (0);
128 }
129
130 static device_method_t omap4_gpio_methods[] = {
131 /* bus interface */
132 DEVMETHOD(device_probe, omap4_gpio_probe),
133
134 /* ti_gpio interface */
135 DEVMETHOD(ti_gpio_set_flags, omap4_gpio_set_flags),
136 DEVMETHOD(ti_gpio_get_flags, omap4_gpio_get_flags),
137
138 DEVMETHOD_END
139 };
140
141 extern driver_t ti_gpio_driver;
142
143 DEFINE_CLASS_1(gpio, omap4_gpio_driver, omap4_gpio_methods,
144 sizeof(struct ti_gpio_softc), ti_gpio_driver);
145 DRIVER_MODULE(omap4_gpio, simplebus, omap4_gpio_driver, 0, 0);
146