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