gpio_ebus.c revision 1.2
1 /* $NetBSD: gpio_ebus.c,v 1.2 2011/06/12 05:27:56 tsutsui Exp $ */ 2 3 /*- 4 * Copyright (c) 2010 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code was written by Alessandro Forin and Neil Pittman 8 * at Microsoft Research and contributed to The NetBSD Foundation 9 * by Microsoft Corporation. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 30 * POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 #include <sys/cdefs.h> /* RCS ID & Copyright macro defns */ 34 __KERNEL_RCSID(0, "$NetBSD: gpio_ebus.c,v 1.2 2011/06/12 05:27:56 tsutsui Exp $"); 35 36 #include <sys/param.h> 37 #include <sys/device.h> 38 #include <sys/systm.h> 39 #include <sys/gpio.h> 40 #include <dev/gpio/gpiovar.h> 41 42 #include <emips/ebus/ebusvar.h> 43 #include <emips/emips/machdep.h> 44 #include <machine/emipsreg.h> 45 46 /* 47 * Device softc 48 */ 49 #define GPIO_NPINS 32 50 51 struct epio_softc { 52 struct device sc_dev; 53 struct _Pio *sc_dp; 54 struct gpio_chipset_tag sc_gpio_gc; 55 gpio_pin_t sc_gpio_pins[GPIO_NPINS]; 56 }; 57 58 static int epio_ebus_match(device_t, cfdata_t, void *); 59 static void epio_ebus_attach(device_t, device_t, void *); 60 61 CFATTACH_DECL(epio, sizeof (struct epio_softc), 62 epio_ebus_match, epio_ebus_attach, NULL, NULL); 63 64 static int epio_pin_read(void *, int); 65 static void epio_pin_write(void *, int, int); 66 static void epio_pin_ctl(void *, int, int); 67 68 static int 69 epio_ebus_match(device_t parent, cfdata_t cf, void *aux) 70 { 71 struct ebus_attach_args *ia = aux; 72 struct _Pio *f = (struct _Pio *)ia->ia_vaddr; 73 74 if (strcmp("gpio", ia->ia_name) != 0) 75 return 0; 76 if ((f == NULL) || 77 (f->Tag != PMTTAG_GPIO)) 78 return 0; 79 80 return 1; 81 } 82 83 static void 84 epio_ebus_attach(device_t parent, device_t self, void *aux) 85 { 86 struct epio_softc *sc = (struct epio_softc *)self; 87 struct ebus_attach_args *ia =aux; 88 struct gpiobus_attach_args gba; 89 int i; 90 uint32_t data; 91 92 sc->sc_dp = (struct _Pio *)ia->ia_vaddr; 93 data = sc->sc_dp->PinData; 94 95 #if DEBUG 96 printf(" virt=%p data=%zx", (void*)sc->sc_dp, data); 97 #endif 98 printf(": GPIO controller\n"); 99 100 /* BUGBUG Initialize pins properly */ 101 for (i = 0 ; i < GPIO_NPINS ; i++) { 102 sc->sc_gpio_pins[i].pin_num = i; 103 sc->sc_gpio_pins[i].pin_caps = 104 GPIO_PIN_INOUT | 105 GPIO_PIN_OPENDRAIN | 106 GPIO_PIN_TRISTATE; 107 108 /* current defaults */ 109 sc->sc_gpio_pins[i].pin_flags = GPIO_PIN_INOUT; 110 sc->sc_gpio_pins[i].pin_state = 111 (data & (1 << i)) ? GPIO_PIN_HIGH : GPIO_PIN_LOW; 112 sc->sc_gpio_pins[i].pin_mapped = 0; 113 } 114 115 /* Create controller tag */ 116 sc->sc_gpio_gc.gp_cookie = sc; 117 sc->sc_gpio_gc.gp_pin_read = epio_pin_read; 118 sc->sc_gpio_gc.gp_pin_write = epio_pin_write; 119 sc->sc_gpio_gc.gp_pin_ctl = epio_pin_ctl; 120 121 gba.gba_gc = &sc->sc_gpio_gc; 122 gba.gba_pins = sc->sc_gpio_pins; 123 gba.gba_npins = GPIO_NPINS; 124 125 /* Attach GPIO framework */ 126 (void)config_found(&sc->sc_dev, &gba, gpiobus_print); 127 } 128 129 static int 130 epio_pin_read(void *arg, int pin) 131 { 132 struct epio_softc *sc = arg; 133 uint32_t data = sc->sc_dp->PinData; 134 int p; 135 136 p = pin % GPIO_NPINS; 137 return (data >> p) & 0x01; 138 } 139 140 static void 141 epio_pin_write(void *arg, int pin, int value) 142 { 143 struct epio_softc *sc = arg; 144 uint32_t data; 145 int p; 146 147 p = pin % GPIO_NPINS; 148 data = 1 << p; 149 if (value) 150 sc->sc_dp->PinData = data; 151 else 152 sc->sc_dp->ClearData = data; 153 } 154 155 static void 156 epio_pin_ctl(void *arg, int pin, int flags) 157 { 158 struct epio_softc *sc = arg; 159 uint32_t data; 160 int p; 161 162 p = pin % GPIO_NPINS; 163 data = (1 << p); 164 165 if (flags & GPIO_PIN_INOUT) { 166 sc->sc_dp->Direction = data; 167 } 168 169 if (flags & GPIO_PIN_TRISTATE) { 170 sc->sc_dp->OutDisable = data; 171 } 172 173 if (flags & GPIO_PIN_OPENDRAIN) { 174 sc->sc_dp->Enable = data; 175 } 176 } 177
Indexes created Sat Sep 27 14:09:57 GMT 2025