1 /* $NetBSD: pl061.c,v 1.2 2018/10/21 18:31:14 jmcneill Exp $ */ 2 3 /* 4 * Copyright (c) 2018 Jonathan A. Kollasch 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, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 18 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 19 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR 20 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 21 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 22 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 23 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 24 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 25 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 26 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __KERNEL_RCSID(0, "$NetBSD: pl061.c,v 1.2 2018/10/21 18:31:14 jmcneill Exp $"); 31 32 #include <sys/param.h> 33 #include <sys/bus.h> 34 #include <sys/device.h> 35 #include <sys/intr.h> 36 #include <sys/systm.h> 37 #include <sys/kernel.h> 38 #include <sys/kmem.h> 39 #include <sys/gpio.h> 40 41 #include <dev/gpio/gpiovar.h> 42 #include "gpio.h" 43 44 #include <dev/ic/pl061reg.h> 45 #include <dev/ic/pl061var.h> 46 47 void 48 plgpio_attach(struct plgpio_softc *sc) 49 { 50 struct gpiobus_attach_args gba; 51 u_int pin; 52 53 sc->sc_gc.gp_cookie = sc; 54 sc->sc_gc.gp_pin_read = plgpio_pin_read; 55 sc->sc_gc.gp_pin_write = plgpio_pin_write; 56 sc->sc_gc.gp_pin_ctl = plgpio_pin_ctl; 57 58 const uint32_t cnf = PLGPIO_READ(sc, PL061_GPIOAFSEL_REG) | 59 sc->sc_reserved_mask; 60 61 for (pin = 0; pin < 8; pin++) { 62 sc->sc_pins[pin].pin_num = pin; 63 /* skip pins in hardware control mode */ 64 if ((cnf & __BIT(pin)) != 0) 65 continue; 66 sc->sc_pins[pin].pin_caps = 67 GPIO_PIN_INPUT | GPIO_PIN_OUTPUT | 68 GPIO_PIN_TRISTATE; 69 sc->sc_pins[pin].pin_state = 70 plgpio_pin_read(sc, pin); 71 } 72 73 memset(&gba, 0, sizeof(gba)); 74 gba.gba_gc = &sc->sc_gc; 75 gba.gba_pins = sc->sc_pins; 76 gba.gba_npins = 8; 77 78 #if NGPIO > 0 79 (void)config_found_ia(sc->sc_dev, "gpiobus", &gba, 80 gpiobus_print); 81 #endif 82 } 83 84 int 85 plgpio_pin_read(void *priv, int pin) 86 { 87 struct plgpio_softc * const sc = priv; 88 89 const uint32_t v = PLGPIO_READ(sc, PL061_GPIODATA_REG(1<<pin)); 90 91 return (v >> pin) & 1; 92 } 93 94 void 95 plgpio_pin_write(void *priv, int pin, int val) 96 { 97 struct plgpio_softc * const sc = priv; 98 99 PLGPIO_WRITE(sc, PL061_GPIODATA_REG(1 << pin), val << pin); 100 } 101 102 void 103 plgpio_pin_ctl(void *priv, int pin, int flags) 104 { 105 struct plgpio_softc * const sc = priv; 106 uint32_t v; 107 108 if (flags & GPIO_PIN_INPUT) { 109 v = PLGPIO_READ(sc, PL061_GPIODIR_REG); 110 v &= ~(1 << pin); 111 PLGPIO_WRITE(sc, PL061_GPIODIR_REG, v); 112 } else if (flags & GPIO_PIN_OUTPUT) { 113 v = PLGPIO_READ(sc, PL061_GPIODIR_REG); 114 v |= (1 << pin); 115 PLGPIO_WRITE(sc, PL061_GPIODIR_REG, v); 116 } 117 } 118