1 /* $OpenBSD: isagpio.c,v 1.4 2009/03/29 21:53:52 sthen Exp $ */ 2 3 /* 4 * Copyright (c) 2006 Oleg Safiullin <form@pdp-11.org.ru> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice unmodified, this list of conditions, and the following 12 * disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 */ 30 31 #include <sys/param.h> 32 #include <sys/systm.h> 33 #include <sys/device.h> 34 #include <sys/gpio.h> 35 36 #include <machine/bus.h> 37 #include <machine/intr.h> 38 39 #include <dev/isa/isavar.h> 40 41 #include <dev/gpio/gpiovar.h> 42 43 #define ISAGPIO_IOSIZE 1 44 #define ISAGPIO_NPINS 8 45 46 struct isagpio_softc { 47 struct device sc_dev; 48 49 bus_space_tag_t sc_iot; 50 bus_space_handle_t sc_ioh; 51 52 struct gpio_chipset_tag sc_gpio_gc; 53 struct gpio_pin sc_gpio_pins[ISAGPIO_NPINS]; 54 u_int8_t sc_gpio_mask; 55 }; 56 57 int isagpio_match(struct device *, void *, void *); 58 void isagpio_attach(struct device *, struct device *, void *); 59 int isagpio_pin_read(void *, int); 60 void isagpio_pin_write(void *, int, int); 61 void isagpio_pin_ctl(void *, int, int); 62 63 struct cfattach isagpio_ca = { 64 sizeof(struct isagpio_softc), isagpio_match, isagpio_attach 65 }; 66 67 struct cfdriver isagpio_cd = { 68 NULL, "isagpio", DV_DULL 69 }; 70 71 int 72 isagpio_match(struct device *parent, void *match, void *aux) 73 { 74 struct isa_attach_args *ia = aux; 75 bus_space_handle_t ioh; 76 77 if (ia->ia_iobase == -1 || bus_space_map(ia->ia_iot, ia->ia_iobase, 78 ISAGPIO_IOSIZE, 0, &ioh) != 0) 79 return (0); 80 81 bus_space_unmap(ia->ia_iot, ioh, ISAGPIO_IOSIZE); 82 ia->ia_iosize = ISAGPIO_IOSIZE; 83 ia->ipa_nio = 1; 84 ia->ipa_nmem = 0; 85 ia->ipa_nirq = 0; 86 ia->ipa_ndrq = 0; 87 88 return (1); 89 } 90 91 void 92 isagpio_attach(struct device *parent, struct device *self, void *aux) 93 { 94 struct isagpio_softc *sc = (void *)self; 95 struct isa_attach_args *ia = aux; 96 struct gpiobus_attach_args gba; 97 int i; 98 99 if (bus_space_map(ia->ia_iot, ia->ia_iobase, ia->ia_iosize, 0, 100 &sc->sc_ioh) != 0) { 101 printf(": can't map i/o space\n"); 102 return; 103 } 104 105 printf("\n"); 106 107 sc->sc_iot = ia->ia_iot; 108 sc->sc_gpio_mask = 0; 109 110 for (i = 0; i < ISAGPIO_NPINS; i++) { 111 sc->sc_gpio_pins[i].pin_num = i; 112 sc->sc_gpio_pins[i].pin_caps = GPIO_PIN_INPUT | GPIO_PIN_OUTPUT; 113 sc->sc_gpio_pins[i].pin_state = GPIO_PIN_LOW; 114 } 115 116 sc->sc_gpio_gc.gp_cookie = sc; 117 sc->sc_gpio_gc.gp_pin_read = isagpio_pin_read; 118 sc->sc_gpio_gc.gp_pin_write = isagpio_pin_write; 119 sc->sc_gpio_gc.gp_pin_ctl = isagpio_pin_ctl; 120 121 gba.gba_name = "gpio"; 122 gba.gba_gc = &sc->sc_gpio_gc; 123 gba.gba_pins = sc->sc_gpio_pins; 124 gba.gba_npins = ISAGPIO_NPINS; 125 126 (void)config_found(&sc->sc_dev, &gba, gpiobus_print); 127 } 128 129 int 130 isagpio_pin_read(void *arg, int pin) 131 { 132 struct isagpio_softc *sc = arg; 133 u_int8_t mask; 134 135 mask = bus_space_read_1(sc->sc_iot, sc->sc_ioh, 0); 136 return ((mask >> pin) & 0x01); 137 } 138 139 void 140 isagpio_pin_write(void *arg, int pin, int value) 141 { 142 struct isagpio_softc *sc = arg; 143 144 if (value == GPIO_PIN_LOW) 145 sc->sc_gpio_mask &= ~(0x01 << pin); 146 else if (value == GPIO_PIN_HIGH) 147 sc->sc_gpio_mask |= 0x01 << pin; 148 bus_space_write_1(sc->sc_iot, sc->sc_ioh, 0, sc->sc_gpio_mask); 149 } 150 151 void 152 isagpio_pin_ctl(void *arg, int pin, int flags) 153 { 154 } 155