1 /* $NetBSD: plgpio_acpi.c,v 1.7 2021/01/29 15:49:55 thorpej 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 1.7 2021/01/29 15:49:55 thorpej 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 struct device_compatible_entry compat_data[] = { 69 { .compat = "ARMH0061" }, 70 DEVICE_COMPAT_EOL 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 return acpi_compatible_match(aa, compat_data); 79 } 80 81 static void 82 plgpio_acpi_attach(device_t parent, device_t self, void *aux) 83 { 84 struct plgpio_acpi_softc * const asc = device_private(self); 85 struct plgpio_softc * const sc = &asc->sc_base; 86 struct acpi_attach_args *aa = aux; 87 struct acpi_resources res; 88 struct acpi_mem *mem; 89 struct acpi_irq *irq; 90 ACPI_STATUS rv; 91 int error; 92 void *ih; 93 94 sc->sc_dev = self; 95 asc->sc_handle = aa->aa_node->ad_handle; 96 97 rv = acpi_resource_parse(sc->sc_dev, aa->aa_node->ad_handle, "_CRS", 98 &res, &acpi_resource_parse_ops_default); 99 if (ACPI_FAILURE(rv)) 100 return; 101 102 mem = acpi_res_mem(&res, 0); 103 if (mem == NULL) { 104 aprint_error_dev(self, "couldn't find mem resource\n"); 105 goto done; 106 } 107 108 irq = acpi_res_irq(&res, 0); 109 if (irq == NULL) { 110 aprint_error_dev(self, "couldn't find irq resource\n"); 111 goto done; 112 } 113 114 sc->sc_dev = self; 115 sc->sc_bst = aa->aa_memt; 116 error = bus_space_map(sc->sc_bst, mem->ar_base, mem->ar_length, 0, &sc->sc_bsh); 117 if (error) { 118 aprint_error_dev(self, "couldn't map registers\n"); 119 return; 120 } 121 122 plgpio_attach(sc); 123 124 rv = acpi_event_create_gpio(self, asc->sc_handle, plgpio_acpi_register_event, asc); 125 if (ACPI_FAILURE(rv)) { 126 if (rv != AE_NOT_FOUND) 127 aprint_error_dev(self, "failed to create events: %s\n", AcpiFormatException(rv)); 128 goto done; 129 } 130 131 ih = acpi_intr_establish(self, 132 (uint64_t)(uintptr_t)asc->sc_handle, 133 IPL_VM, false, plgpio_acpi_intr, asc, device_xname(self)); 134 if (ih == NULL) 135 aprint_error_dev(self, "couldn't establish interrupt\n"); 136 137 done: 138 acpi_resource_cleanup(&res); 139 } 140 141 static void 142 plgpio_acpi_register_event(void *priv, struct acpi_event *ev, ACPI_RESOURCE_GPIO *gpio) 143 { 144 struct plgpio_acpi_softc * const asc = priv; 145 struct plgpio_softc * const sc = &asc->sc_base; 146 uint32_t ibe, iev, is, ie; 147 148 const int pin = gpio->PinTable[0]; 149 150 if (pin >= __arraycount(asc->sc_event)) { 151 aprint_error_dev(asc->sc_base.sc_dev, 152 "ignoring event for pin %u (out of range)\n", pin); 153 return; 154 } 155 if (asc->sc_event[pin] != NULL) { 156 aprint_error_dev(asc->sc_base.sc_dev, 157 "ignoring duplicate pin %u\n", pin); 158 return; 159 } 160 161 asc->sc_event[pin] = ev; 162 asc->sc_base.sc_reserved_mask |= __BIT(pin); 163 164 /* 165 * Configure and enable interrupts for this pin. 166 */ 167 168 ibe = PLGPIO_READ(sc, PL061_GPIOIBE_REG); 169 iev = PLGPIO_READ(sc, PL061_GPIOIEV_REG); 170 switch (gpio->Polarity) { 171 case ACPI_ACTIVE_HIGH: 172 ibe &= ~__BIT(pin); 173 iev |= __BIT(pin); 174 break; 175 case ACPI_ACTIVE_LOW: 176 ibe &= ~__BIT(pin); 177 iev &= ~__BIT(pin); 178 break; 179 case ACPI_ACTIVE_BOTH: 180 ibe |= __BIT(pin); 181 break; 182 } 183 PLGPIO_WRITE(sc, PL061_GPIOIBE_REG, ibe); 184 PLGPIO_WRITE(sc, PL061_GPIOIEV_REG, iev); 185 186 is = PLGPIO_READ(sc, PL061_GPIOIS_REG); 187 switch (gpio->Triggering) { 188 case ACPI_LEVEL_SENSITIVE: 189 is |= __BIT(pin); 190 break; 191 case ACPI_EDGE_SENSITIVE: 192 is &= ~__BIT(pin); 193 break; 194 } 195 PLGPIO_WRITE(sc, PL061_GPIOIS_REG, is); 196 197 delay(20); 198 199 PLGPIO_WRITE(sc, PL061_GPIOIC_REG, __BIT(pin)); 200 201 ie = PLGPIO_READ(sc, PL061_GPIOIE_REG); 202 ie |= __BIT(pin); 203 PLGPIO_WRITE(sc, PL061_GPIOIE_REG, ie); 204 } 205 206 static int 207 plgpio_acpi_intr(void *priv) 208 { 209 struct plgpio_acpi_softc * const asc = priv; 210 struct plgpio_softc * const sc = &asc->sc_base; 211 uint32_t mis; 212 int bit; 213 214 mis = PLGPIO_READ(sc, PL061_GPIOMIS_REG); 215 PLGPIO_WRITE(sc, PL061_GPIOIC_REG, mis); 216 217 while ((bit = __builtin_ffs(mis)) != 0) { 218 const int pin = bit - 1; 219 struct acpi_event * const ev = asc->sc_event[pin]; 220 KASSERT(ev != NULL); 221 222 acpi_event_notify(ev); 223 224 mis &= ~__BIT(pin); 225 } 226 227 return 1; 228 } 229
Indexes created Sat Sep 20 22:09:52 GMT 2025