plgpio_acpi.c revision 1.3
1 /* $NetBSD: plgpio_acpi.c,v 1.3 2018/10/22 22:29:35 jmcneill Exp $ */ 2 3 /*- 4 * Copyright (c) 2018 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Jared McNeill <jmcneill (at) invisible.ca>. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 __KERNEL_RCSID(0, "$NetBSD: plgpio_acpi.c,v 1.3 2018/10/22 22:29:35 jmcneill Exp $"); 34 35 #include <sys/param.h> 36 #include <sys/bus.h> 37 #include <sys/cpu.h> 38 #include <sys/device.h> 39 #include <sys/gpio.h> 40 41 #include <dev/acpi/acpireg.h> 42 #include <dev/acpi/acpivar.h> 43 #include <dev/acpi/acpi_event.h> 44 45 #include <dev/gpio/gpiovar.h> 46 #include <dev/ic/pl061var.h> 47 #include <dev/ic/pl061reg.h> 48 49 struct plgpio_acpi_softc; 50 51 struct plgpio_acpi_softc { 52 struct plgpio_softc sc_base; 53 54 ACPI_HANDLE sc_handle; 55 56 struct acpi_event * sc_event[8]; 57 }; 58 59 static int plgpio_acpi_match(device_t, cfdata_t, void *); 60 static void plgpio_acpi_attach(device_t, device_t, void *); 61 62 static void plgpio_acpi_register_event(void *, struct acpi_event *, ACPI_RESOURCE_GPIO *); 63 static int plgpio_acpi_intr(void *); 64 65 CFATTACH_DECL_NEW(plgpio_acpi, sizeof(struct plgpio_acpi_softc), plgpio_acpi_match, plgpio_acpi_attach, NULL, NULL); 66 67 static const char * const compatible[] = { 68 "ARMH0061", 69 NULL 70 }; 71 72 static int 73 plgpio_acpi_match(device_t parent, cfdata_t cf, void *aux) 74 { 75 struct acpi_attach_args *aa = aux; 76 77 if (aa->aa_node->ad_type != ACPI_TYPE_DEVICE) 78 return 0; 79 80 return acpi_match_hid(aa->aa_node->ad_devinfo, compatible); 81 } 82 83 static void 84 plgpio_acpi_attach(device_t parent, device_t self, void *aux) 85 { 86 struct plgpio_acpi_softc * const asc = device_private(self); 87 struct plgpio_softc * const sc = &asc->sc_base; 88 struct acpi_attach_args *aa = aux; 89 struct acpi_resources res; 90 struct acpi_mem *mem; 91 struct acpi_irq *irq; 92 ACPI_STATUS rv; 93 int error; 94 void *ih; 95 96 sc->sc_dev = self; 97 asc->sc_handle = aa->aa_node->ad_handle; 98 99 rv = acpi_resource_parse(sc->sc_dev, aa->aa_node->ad_handle, "_CRS", 100 &res, &acpi_resource_parse_ops_default); 101 if (ACPI_FAILURE(rv)) 102 return; 103 104 mem = acpi_res_mem(&res, 0); 105 if (mem == NULL) { 106 aprint_error_dev(self, "couldn't find mem resource\n"); 107 goto done; 108 } 109 110 irq = acpi_res_irq(&res, 0); 111 if (mem == NULL) { 112 aprint_error_dev(self, "couldn't find irq resource\n"); 113 goto done; 114 } 115 116 sc->sc_dev = self; 117 sc->sc_bst = aa->aa_memt; 118 error = bus_space_map(sc->sc_bst, mem->ar_base, mem->ar_length, 0, &sc->sc_bsh); 119 if (error) { 120 aprint_error_dev(self, "couldn't map registers\n"); 121 return; 122 } 123 124 plgpio_attach(sc); 125 126 if (ACPI_FAILURE(acpi_event_create_gpio(self, asc->sc_handle, plgpio_acpi_register_event, asc))) { 127 aprint_error_dev(self, "failed to create events\n"); 128 goto done; 129 } 130 131 const int type = (irq->ar_type == ACPI_EDGE_SENSITIVE) ? IST_EDGE : IST_LEVEL; 132 ih = intr_establish(irq->ar_irq, IPL_VM, type, plgpio_acpi_intr, asc); 133 if (ih == NULL) 134 aprint_error_dev(self, "couldn't establish interrupt\n"); 135 136 done: 137 acpi_resource_cleanup(&res); 138 } 139 140 static void 141 plgpio_acpi_register_event(void *priv, struct acpi_event *ev, ACPI_RESOURCE_GPIO *gpio) 142 { 143 struct plgpio_acpi_softc * const asc = priv; 144 struct plgpio_softc * const sc = &asc->sc_base; 145 uint32_t ibe, iev, is, ie; 146 147 const int pin = gpio->PinTable[0]; 148 149 if (pin >= __arraycount(asc->sc_event)) { 150 aprint_error_dev(asc->sc_base.sc_dev, 151 "ignoring event for pin %u (out of range)\n", pin); 152 return; 153 } 154 if (asc->sc_event[pin] != NULL) { 155 aprint_error_dev(asc->sc_base.sc_dev, 156 "ignoring duplicate pin %u\n", pin); 157 return; 158 } 159 160 asc->sc_event[pin] = ev; 161 asc->sc_base.sc_reserved_mask |= __BIT(pin); 162 163 /* 164 * Configure and enable interrupts for this pin. 165 */ 166 167 ibe = PLGPIO_READ(sc, PL061_GPIOIBE_REG); 168 iev = PLGPIO_READ(sc, PL061_GPIOIEV_REG); 169 switch (gpio->Polarity) { 170 case ACPI_ACTIVE_HIGH: 171 ibe &= ~__BIT(pin); 172 iev |= __BIT(pin); 173 break; 174 case ACPI_ACTIVE_LOW: 175 ibe &= ~__BIT(pin); 176 iev &= ~__BIT(pin); 177 break; 178 case ACPI_ACTIVE_BOTH: 179 ibe |= __BIT(pin); 180 break; 181 } 182 PLGPIO_WRITE(sc, PL061_GPIOIBE_REG, ibe); 183 PLGPIO_WRITE(sc, PL061_GPIOIEV_REG, iev); 184 185 is = PLGPIO_READ(sc, PL061_GPIOIS_REG); 186 switch (gpio->Triggering) { 187 case ACPI_LEVEL_SENSITIVE: 188 is |= __BIT(pin); 189 break; 190 case ACPI_EDGE_SENSITIVE: 191 is &= ~__BIT(pin); 192 break; 193 } 194 PLGPIO_WRITE(sc, PL061_GPIOIS_REG, is); 195 196 delay(20); 197 198 PLGPIO_WRITE(sc, PL061_GPIOIC_REG, __BIT(pin)); 199 200 ie = PLGPIO_READ(sc, PL061_GPIOIE_REG); 201 ie |= __BIT(pin); 202 PLGPIO_WRITE(sc, PL061_GPIOIE_REG, ie); 203 } 204 205 static int 206 plgpio_acpi_intr(void *priv) 207 { 208 struct plgpio_acpi_softc * const asc = priv; 209 struct plgpio_softc * const sc = &asc->sc_base; 210 uint32_t mis; 211 int bit; 212 213 mis = PLGPIO_READ(sc, PL061_GPIOMIS_REG); 214 PLGPIO_WRITE(sc, PL061_GPIOIC_REG, mis); 215 216 while ((bit = __builtin_ffs(mis)) != 0) { 217 const int pin = bit - 1; 218 struct acpi_event * const ev = asc->sc_event[pin]; 219 KASSERT(ev != NULL); 220 221 acpi_event_notify(ev); 222 223 mis &= ~__BIT(pin); 224 } 225 226 return 1; 227 } 228
Indexes created Mon Sep 29 21:09:56 GMT 2025