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 __FBSDID("$FreeBSD$"); 31 32 #include <sys/param.h> 33 #include <sys/systm.h> 34 #include <sys/kernel.h> 35 #include <sys/module.h> 36 #include <sys/bus.h> 37 #include <sys/gpio.h> 38 39 #include <machine/bus.h> 40 41 #include <dev/fdt/fdt_common.h> 42 #include <dev/ofw/ofw_bus.h> 43 #include <dev/ofw/ofw_bus_subr.h> 44 45 #include <arm/ti/ti_cpuid.h> 46 #include <arm/ti/ti_gpio.h> 47 #include <arm/ti/ti_pinmux.h> 48 49 #include <arm/ti/omap4/omap4_scm_padconf.h> 50 51 #include "ti_gpio_if.h" 52 53 static struct ofw_compat_data compat_data[] = { 54 {"ti,omap4-gpio", 1}, 55 {"ti,gpio", 1}, 56 {NULL, 0}, 57 }; 58 59 static int 60 omap4_gpio_probe(device_t dev) 61 { 62 if (ti_chip() != CHIP_OMAP_4) 63 return (ENXIO); 64 65 if (!ofw_bus_status_okay(dev)) 66 return (ENXIO); 67 68 if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0) 69 return (ENXIO); 70 71 device_set_desc(dev, "TI OMAP4 General Purpose I/O (GPIO)"); 72 73 return (0); 74 } 75 76 static int 77 omap4_gpio_set_flags(device_t dev, uint32_t gpio, uint32_t flags) 78 { 79 unsigned int state = 0; 80 struct ti_gpio_softc *sc; 81 82 sc = device_get_softc(dev); 83 /* First the SCM driver needs to be told to put the pad into GPIO mode */ 84 if (flags & GPIO_PIN_OUTPUT) 85 state = PADCONF_PIN_OUTPUT; 86 else if (flags & GPIO_PIN_INPUT) { 87 if (flags & GPIO_PIN_PULLUP) 88 state = PADCONF_PIN_INPUT_PULLUP; 89 else if (flags & GPIO_PIN_PULLDOWN) 90 state = PADCONF_PIN_INPUT_PULLDOWN; 91 else 92 state = PADCONF_PIN_INPUT; 93 } 94 return ti_pinmux_padconf_set_gpiomode((sc->sc_bank-1)*32 + gpio, state); 95 } 96 97 static int 98 omap4_gpio_get_flags(device_t dev, uint32_t gpio, uint32_t *flags) 99 { 100 unsigned int state; 101 struct ti_gpio_softc *sc; 102 103 sc = device_get_softc(dev); 104 105 /* Get the current pin state */ 106 if (ti_pinmux_padconf_get_gpiomode((sc->sc_bank-1)*32 + gpio, &state) != 0) { 107 *flags = 0; 108 return (EINVAL); 109 } else { 110 switch (state) { 111 case PADCONF_PIN_OUTPUT: 112 *flags = GPIO_PIN_OUTPUT; 113 break; 114 case PADCONF_PIN_INPUT: 115 *flags = GPIO_PIN_INPUT; 116 break; 117 case PADCONF_PIN_INPUT_PULLUP: 118 *flags = GPIO_PIN_INPUT | GPIO_PIN_PULLUP; 119 break; 120 case PADCONF_PIN_INPUT_PULLDOWN: 121 *flags = GPIO_PIN_INPUT | GPIO_PIN_PULLDOWN; 122 break; 123 default: 124 *flags = 0; 125 break; 126 } 127 } 128 129 return (0); 130 } 131 132 static device_method_t omap4_gpio_methods[] = { 133 /* bus interface */ 134 DEVMETHOD(device_probe, omap4_gpio_probe), 135 136 /* ti_gpio interface */ 137 DEVMETHOD(ti_gpio_set_flags, omap4_gpio_set_flags), 138 DEVMETHOD(ti_gpio_get_flags, omap4_gpio_get_flags), 139 140 DEVMETHOD_END 141 }; 142 143 extern driver_t ti_gpio_driver; 144 static devclass_t omap4_gpio_devclass; 145 146 DEFINE_CLASS_1(gpio, omap4_gpio_driver, omap4_gpio_methods, 147 sizeof(struct ti_gpio_softc), ti_gpio_driver); 148 DRIVER_MODULE(omap4_gpio, simplebus, omap4_gpio_driver, omap4_gpio_devclass, 149 0, 0); 150