plgpio_acpi.c revision 1.6
1 /* $NetBSD: plgpio_acpi.c,v 1.6 2020/12/07 10:02:51 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 1.6 2020/12/07 10:02:51 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_intr.h> 44 #include <dev/acpi/acpi_event.h> 45 46 #include <dev/gpio/gpiovar.h> 47 #include <dev/ic/pl061var.h> 48 #include <dev/ic/pl061reg.h> 49 50 struct plgpio_acpi_softc; 51 52 struct plgpio_acpi_softc { 53 struct plgpio_softc sc_base; 54 55 ACPI_HANDLE sc_handle; 56 57 struct acpi_event * sc_event[8]; 58 }; 59 60 static int plgpio_acpi_match(device_t, cfdata_t, void *); 61 static void plgpio_acpi_attach(device_t, device_t, void *); 62 63 static void plgpio_acpi_register_event(void *, struct acpi_event *, ACPI_RESOURCE_GPIO *); 64 static int plgpio_acpi_intr(void *); 65 66 CFATTACH_DECL_NEW(plgpio_acpi, sizeof(struct plgpio_acpi_softc), plgpio_acpi_match, plgpio_acpi_attach, NULL, NULL); 67 68 static const char * const compatible[] = { 69 "ARMH0061", 70 NULL 71 }; 72 73 static int 74 plgpio_acpi_match(device_t parent, cfdata_t cf, void *aux) 75 { 76 struct acpi_attach_args *aa = aux; 77 78 if (aa->aa_node->ad_type != ACPI_TYPE_DEVICE) 79 return 0; 80 81 return acpi_match_hid(aa->aa_node->ad_devinfo, compatible); 82 } 83 84 static void 85 plgpio_acpi_attach(device_t parent, device_t self, void *aux) 86 { 87 struct plgpio_acpi_softc * const asc = device_private(self); 88 struct plgpio_softc * const sc = &asc->sc_base; 89 struct acpi_attach_args *aa = aux; 90 struct acpi_resources res; 91 struct acpi_mem *mem; 92 struct acpi_irq *irq; 93 ACPI_STATUS rv; 94 int error; 95 void *ih; 96 97 sc->sc_dev = self; 98 asc->sc_handle = aa->aa_node->ad_handle; 99 100 rv = acpi_resource_parse(sc->sc_dev, aa->aa_node->ad_handle, "_CRS", 101 &res, &acpi_resource_parse_ops_default); 102 if (ACPI_FAILURE(rv)) 103 return; 104 105 mem = acpi_res_mem(&res, 0); 106 if (mem == NULL) { 107 aprint_error_dev(self, "couldn't find mem resource\n"); 108 goto done; 109 } 110 111 irq = acpi_res_irq(&res, 0); 112 if (irq == NULL) { 113 aprint_error_dev(self, "couldn't find irq resource\n"); 114 goto done; 115 } 116 117 sc->sc_dev = self; 118 sc->sc_bst = aa->aa_memt; 119 error = bus_space_map(sc->sc_bst, mem->ar_base, mem->ar_length, 0, &sc->sc_bsh); 120 if (error) { 121 aprint_error_dev(self, "couldn't map registers\n"); 122 return; 123 } 124 125 plgpio_attach(sc); 126 127 rv = acpi_event_create_gpio(self, asc->sc_handle, plgpio_acpi_register_event, asc); 128 if (ACPI_FAILURE(rv)) { 129 if (rv != AE_NOT_FOUND) 130 aprint_error_dev(self, "failed to create events: %s\n", AcpiFormatException(rv)); 131 goto done; 132 } 133 134 ih = acpi_intr_establish(self, 135 (uint64_t)(uintptr_t)asc->sc_handle, 136 IPL_VM, false, plgpio_acpi_intr, asc, device_xname(self)); 137 if (ih == NULL) 138 aprint_error_dev(self, "couldn't establish interrupt\n"); 139 140 done: 141 acpi_resource_cleanup(&res); 142 } 143 144 static void 145 plgpio_acpi_register_event(void *priv, struct acpi_event *ev, ACPI_RESOURCE_GPIO *gpio) 146 { 147 struct plgpio_acpi_softc * const asc = priv; 148 struct plgpio_softc * const sc = &asc->sc_base; 149 uint32_t ibe, iev, is, ie; 150 151 const int pin = gpio->PinTable[0]; 152 153 if (pin >= __arraycount(asc->sc_event)) { 154 aprint_error_dev(asc->sc_base.sc_dev, 155 "ignoring event for pin %u (out of range)\n", pin); 156 return; 157 } 158 if (asc->sc_event[pin] != NULL) { 159 aprint_error_dev(asc->sc_base.sc_dev, 160 "ignoring duplicate pin %u\n", pin); 161 return; 162 } 163 164 asc->sc_event[pin] = ev; 165 asc->sc_base.sc_reserved_mask |= __BIT(pin); 166 167 /* 168 * Configure and enable interrupts for this pin. 169 */ 170 171 ibe = PLGPIO_READ(sc, PL061_GPIOIBE_REG); 172 iev = PLGPIO_READ(sc, PL061_GPIOIEV_REG); 173 switch (gpio->Polarity) { 174 case ACPI_ACTIVE_HIGH: 175 ibe &= ~__BIT(pin); 176 iev |= __BIT(pin); 177 break; 178 case ACPI_ACTIVE_LOW: 179 ibe &= ~__BIT(pin); 180 iev &= ~__BIT(pin); 181 break; 182 case ACPI_ACTIVE_BOTH: 183 ibe |= __BIT(pin); 184 break; 185 } 186 PLGPIO_WRITE(sc, PL061_GPIOIBE_REG, ibe); 187 PLGPIO_WRITE(sc, PL061_GPIOIEV_REG, iev); 188 189 is = PLGPIO_READ(sc, PL061_GPIOIS_REG); 190 switch (gpio->Triggering) { 191 case ACPI_LEVEL_SENSITIVE: 192 is |= __BIT(pin); 193 break; 194 case ACPI_EDGE_SENSITIVE: 195 is &= ~__BIT(pin); 196 break; 197 } 198 PLGPIO_WRITE(sc, PL061_GPIOIS_REG, is); 199 200 delay(20); 201 202 PLGPIO_WRITE(sc, PL061_GPIOIC_REG, __BIT(pin)); 203 204 ie = PLGPIO_READ(sc, PL061_GPIOIE_REG); 205 ie |= __BIT(pin); 206 PLGPIO_WRITE(sc, PL061_GPIOIE_REG, ie); 207 } 208 209 static int 210 plgpio_acpi_intr(void *priv) 211 { 212 struct plgpio_acpi_softc * const asc = priv; 213 struct plgpio_softc * const sc = &asc->sc_base; 214 uint32_t mis; 215 int bit; 216 217 mis = PLGPIO_READ(sc, PL061_GPIOMIS_REG); 218 PLGPIO_WRITE(sc, PL061_GPIOIC_REG, mis); 219 220 while ((bit = __builtin_ffs(mis)) != 0) { 221 const int pin = bit - 1; 222 struct acpi_event * const ev = asc->sc_event[pin]; 223 KASSERT(ev != NULL); 224 225 acpi_event_notify(ev); 226 227 mis &= ~__BIT(pin); 228 } 229 230 return 1; 231 } 232
Indexes created Mon Sep 29 18:09:42 GMT 2025