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 #include <sys/cdefs.h> 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 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 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 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