/* $NetBSD: plgpio_acpi.c,v 1.5 2018/11/23 14:08:40 jmcneill Exp $ */ /*- * Copyright (c) 2018 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Jared McNeill . * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ #include __KERNEL_RCSID(0, "$NetBSD: plgpio_acpi.c,v 1.5 2018/11/23 14:08:40 jmcneill Exp $"); #include #include #include #include #include #include #include #include #include #include #include #include struct plgpio_acpi_softc; struct plgpio_acpi_softc { struct plgpio_softc sc_base; ACPI_HANDLE sc_handle; struct acpi_event * sc_event[8]; }; static int plgpio_acpi_match(device_t, cfdata_t, void *); static void plgpio_acpi_attach(device_t, device_t, void *); static void plgpio_acpi_register_event(void *, struct acpi_event *, ACPI_RESOURCE_GPIO *); static int plgpio_acpi_intr(void *); CFATTACH_DECL_NEW(plgpio_acpi, sizeof(struct plgpio_acpi_softc), plgpio_acpi_match, plgpio_acpi_attach, NULL, NULL); static const char * const compatible[] = { "ARMH0061", NULL }; static int plgpio_acpi_match(device_t parent, cfdata_t cf, void *aux) { struct acpi_attach_args *aa = aux; if (aa->aa_node->ad_type != ACPI_TYPE_DEVICE) return 0; return acpi_match_hid(aa->aa_node->ad_devinfo, compatible); } static void plgpio_acpi_attach(device_t parent, device_t self, void *aux) { struct plgpio_acpi_softc * const asc = device_private(self); struct plgpio_softc * const sc = &asc->sc_base; struct acpi_attach_args *aa = aux; struct acpi_resources res; struct acpi_mem *mem; struct acpi_irq *irq; ACPI_STATUS rv; int error; void *ih; sc->sc_dev = self; asc->sc_handle = aa->aa_node->ad_handle; rv = acpi_resource_parse(sc->sc_dev, aa->aa_node->ad_handle, "_CRS", &res, &acpi_resource_parse_ops_default); if (ACPI_FAILURE(rv)) return; mem = acpi_res_mem(&res, 0); if (mem == NULL) { aprint_error_dev(self, "couldn't find mem resource\n"); goto done; } irq = acpi_res_irq(&res, 0); if (irq == NULL) { aprint_error_dev(self, "couldn't find irq resource\n"); goto done; } sc->sc_dev = self; sc->sc_bst = aa->aa_memt; error = bus_space_map(sc->sc_bst, mem->ar_base, mem->ar_length, 0, &sc->sc_bsh); if (error) { aprint_error_dev(self, "couldn't map registers\n"); return; } plgpio_attach(sc); rv = acpi_event_create_gpio(self, asc->sc_handle, plgpio_acpi_register_event, asc); if (ACPI_FAILURE(rv)) { if (rv != AE_NOT_FOUND) aprint_error_dev(self, "failed to create events: %s\n", AcpiFormatException(rv)); goto done; } ih = acpi_intr_establish(self, (uint64_t)asc->sc_handle, IPL_VM, false, plgpio_acpi_intr, asc, device_xname(self)); if (ih == NULL) aprint_error_dev(self, "couldn't establish interrupt\n"); done: acpi_resource_cleanup(&res); } static void plgpio_acpi_register_event(void *priv, struct acpi_event *ev, ACPI_RESOURCE_GPIO *gpio) { struct plgpio_acpi_softc * const asc = priv; struct plgpio_softc * const sc = &asc->sc_base; uint32_t ibe, iev, is, ie; const int pin = gpio->PinTable[0]; if (pin >= __arraycount(asc->sc_event)) { aprint_error_dev(asc->sc_base.sc_dev, "ignoring event for pin %u (out of range)\n", pin); return; } if (asc->sc_event[pin] != NULL) { aprint_error_dev(asc->sc_base.sc_dev, "ignoring duplicate pin %u\n", pin); return; } asc->sc_event[pin] = ev; asc->sc_base.sc_reserved_mask |= __BIT(pin); /* * Configure and enable interrupts for this pin. */ ibe = PLGPIO_READ(sc, PL061_GPIOIBE_REG); iev = PLGPIO_READ(sc, PL061_GPIOIEV_REG); switch (gpio->Polarity) { case ACPI_ACTIVE_HIGH: ibe &= ~__BIT(pin); iev |= __BIT(pin); break; case ACPI_ACTIVE_LOW: ibe &= ~__BIT(pin); iev &= ~__BIT(pin); break; case ACPI_ACTIVE_BOTH: ibe |= __BIT(pin); break; } PLGPIO_WRITE(sc, PL061_GPIOIBE_REG, ibe); PLGPIO_WRITE(sc, PL061_GPIOIEV_REG, iev); is = PLGPIO_READ(sc, PL061_GPIOIS_REG); switch (gpio->Triggering) { case ACPI_LEVEL_SENSITIVE: is |= __BIT(pin); break; case ACPI_EDGE_SENSITIVE: is &= ~__BIT(pin); break; } PLGPIO_WRITE(sc, PL061_GPIOIS_REG, is); delay(20); PLGPIO_WRITE(sc, PL061_GPIOIC_REG, __BIT(pin)); ie = PLGPIO_READ(sc, PL061_GPIOIE_REG); ie |= __BIT(pin); PLGPIO_WRITE(sc, PL061_GPIOIE_REG, ie); } static int plgpio_acpi_intr(void *priv) { struct plgpio_acpi_softc * const asc = priv; struct plgpio_softc * const sc = &asc->sc_base; uint32_t mis; int bit; mis = PLGPIO_READ(sc, PL061_GPIOMIS_REG); PLGPIO_WRITE(sc, PL061_GPIOIC_REG, mis); while ((bit = __builtin_ffs(mis)) != 0) { const int pin = bit - 1; struct acpi_event * const ev = asc->sc_event[pin]; KASSERT(ev != NULL); acpi_event_notify(ev); mis &= ~__BIT(pin); } return 1; }