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 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 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 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