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: stable/11/sys/arm/ti/am335x/am335x_gpio.c 308325 2016-11-05 04:30:44Z mmel $");
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/resource.h>
43#include <machine/intr.h>
44#include <sys/gpio.h>
45
46#include <dev/fdt/fdt_common.h>
47#include <dev/ofw/ofw_bus.h>
48#include <dev/ofw/ofw_bus_subr.h>
49
50#include <arm/ti/ti_cpuid.h>
51#include <arm/ti/ti_gpio.h>
52#include <arm/ti/ti_pinmux.h>
53
54#include <arm/ti/am335x/am335x_scm_padconf.h>
55
56#include "ti_gpio_if.h"
57
58static struct ofw_compat_data compat_data[] = {
59	{"ti,am335x-gpio",	1},
60	/* Linux uses ti,omap4-gpio on am335x so we need to support it */
61	{"ti,omap4-gpio",	1},
62	{"ti,gpio",		1},
63	{NULL,			0},
64};
65
66static int
67am335x_gpio_probe(device_t dev)
68{
69	if (ti_chip() != CHIP_AM335X)
70		return (ENXIO);
71
72	if (!ofw_bus_status_okay(dev))
73		return (ENXIO);
74
75	if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0)
76		return (ENXIO);
77
78	device_set_desc(dev, "TI AM335x General Purpose I/O (GPIO)");
79
80	return (0);
81}
82
83static int
84am335x_gpio_set_flags(device_t dev, uint32_t gpio, uint32_t flags)
85{
86	unsigned int state = 0;
87	struct ti_gpio_softc *sc = device_get_softc(dev);
88
89	if (flags & GPIO_PIN_OUTPUT) {
90		if (flags & GPIO_PIN_PULLUP)
91			state = PADCONF_OUTPUT_PULLUP;
92		else
93			state = PADCONF_OUTPUT;
94	} else if (flags & GPIO_PIN_INPUT) {
95		if (flags & GPIO_PIN_PULLUP)
96			state = PADCONF_INPUT_PULLUP;
97		else if (flags & GPIO_PIN_PULLDOWN)
98			state = PADCONF_INPUT_PULLDOWN;
99		else
100			state = PADCONF_INPUT;
101	}
102	return ti_pinmux_padconf_set_gpiomode(sc->sc_bank*32 + gpio, state);
103}
104
105static int
106am335x_gpio_get_flags(device_t dev, uint32_t gpio, uint32_t *flags)
107{
108	unsigned int state;
109	struct ti_gpio_softc *sc = device_get_softc(dev);
110
111	if (ti_pinmux_padconf_get_gpiomode(sc->sc_bank*32 + gpio, &state) != 0) {
112		*flags = 0;
113		return (EINVAL);
114	} else {
115		switch (state) {
116			case PADCONF_OUTPUT:
117				*flags = GPIO_PIN_OUTPUT;
118				break;
119			case PADCONF_OUTPUT_PULLUP:
120				*flags = GPIO_PIN_OUTPUT | GPIO_PIN_PULLUP;
121				break;
122			case PADCONF_INPUT:
123				*flags = GPIO_PIN_INPUT;
124				break;
125			case PADCONF_INPUT_PULLUP:
126				*flags = GPIO_PIN_INPUT | GPIO_PIN_PULLUP;
127				break;
128			case PADCONF_INPUT_PULLDOWN:
129				*flags = GPIO_PIN_INPUT | GPIO_PIN_PULLDOWN;
130				break;
131			default:
132				*flags = 0;
133				break;
134		}
135	}
136
137	return (0);
138}
139
140static device_method_t am335x_gpio_methods[] = {
141	/* bus interface */
142	DEVMETHOD(device_probe, am335x_gpio_probe),
143
144	/* ti_gpio interface */
145	DEVMETHOD(ti_gpio_set_flags, am335x_gpio_set_flags),
146	DEVMETHOD(ti_gpio_get_flags, am335x_gpio_get_flags),
147
148	DEVMETHOD_END
149};
150
151extern driver_t ti_gpio_driver;
152static devclass_t am335x_gpio_devclass;
153
154DEFINE_CLASS_1(gpio, am335x_gpio_driver, am335x_gpio_methods,
155    sizeof(struct ti_gpio_softc), ti_gpio_driver);
156DRIVER_MODULE(am335x_gpio, simplebus, am335x_gpio_driver, am335x_gpio_devclass,
157    0, 0);
158