/* $NetBSD: bcm2835_com_acpi.c,v 1.2 2021/08/08 18:55:12 jmcneill Exp $ */ /* * Copyright (c) 2021 Jared McNeill <jmcneill@invisible.ca> * All rights reserved. * * 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. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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 <sys/cdefs.h> __KERNEL_RCSID(0, "$NetBSD: bcm2835_com_acpi.c,v 1.2 2021/08/08 18:55:12 jmcneill Exp $"); #include <sys/param.h> #include <sys/device.h> #include <sys/systm.h> #include <sys/termios.h> #include <dev/acpi/acpivar.h> #include <dev/acpi/acpi_intr.h> #include <dev/ic/comvar.h> #include <arm/broadcom/bcm2835_mbox.h> #include <evbarm/rpi/vcio.h> #include <evbarm/rpi/vcprop.h> static int bcmcom_acpi_match(device_t, cfdata_t , void *); static void bcmcom_acpi_attach(device_t, device_t, void *); static u_int bcmcom_acpi_get_clockrate(device_t); struct vcmbox_clockrate_request { struct vcprop_buffer_hdr vb_hdr; struct vcprop_tag_clockrate vbt_clockrate; struct vcprop_tag end; } __packed; CFATTACH_DECL_NEW(bcmcom_acpi, sizeof(struct com_softc), bcmcom_acpi_match, bcmcom_acpi_attach, NULL, NULL); static const struct device_compatible_entry compat_data[] = { { .compat = "BCM2836", .value = COM_TYPE_BCMAUXUART }, DEVICE_COMPAT_EOL }; static int bcmcom_acpi_match(device_t parent, cfdata_t match, void *aux) { struct acpi_attach_args *aa = aux; return acpi_compatible_match(aa, compat_data); } static void bcmcom_acpi_attach(device_t parent, device_t self, void *aux) { struct com_softc *sc = device_private(self); struct acpi_attach_args *aa = aux; const struct device_compatible_entry *dce; struct acpi_resources res; struct acpi_mem *mem; struct acpi_irq *irq; bus_space_tag_t iot; bus_space_handle_t ioh; bus_addr_t base; bus_size_t size; ACPI_STATUS rv; void *ih; sc->sc_dev = self; 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 cleanup; } iot = aa->aa_memt; base = mem->ar_base + 0x40; size = mem->ar_length - 0x40; irq = acpi_res_irq(&res, 0); if (irq == NULL) { aprint_error_dev(self, "couldn't find irq resource\n"); goto cleanup; } dce = acpi_compatible_lookup(aa, compat_data); KASSERT(dce != NULL); sc->sc_type = dce->value; if (!com_is_console(iot, base, &ioh)) { if (bus_space_map(iot, base, size, 0, &ioh)) { aprint_error_dev(self, "can't map mem space\n"); goto cleanup; } } com_init_regs_stride(&sc->sc_regs, iot, ioh, base, 2); aprint_normal("%s", device_xname(self)); sc->sc_frequency = bcmcom_acpi_get_clockrate(self); com_attach_subr(sc); ih = acpi_intr_establish(self, (uint64_t)(uintptr_t)aa->aa_node->ad_handle, IPL_SERIAL, true, comintr, sc, device_xname(self)); if (ih == NULL) { aprint_error_dev(self, "couldn't establish interrupt\n"); goto cleanup; } if (!pmf_device_register(self, NULL, com_resume)) aprint_error_dev(self, "couldn't establish a power handler\n"); cleanup: acpi_resource_cleanup(&res); } static u_int bcmcom_acpi_get_clockrate(device_t dev) { struct vcmbox_clockrate_request vb; uint32_t res; int error; VCPROP_INIT_REQUEST(vb); VCPROP_INIT_TAG(vb.vbt_clockrate, VCPROPTAG_GET_CLOCKRATE); vb.vbt_clockrate.id = htole32(VCPROP_CLK_CORE); error = bcmmbox_request(BCMMBOX_CHANARM2VC, &vb, sizeof(vb), &res); if (error != 0) { aprint_error_dev(dev, "MBOX request failed: %d\n", error); return 0; } if (!vcprop_buffer_success_p(&vb.vb_hdr) || !vcprop_tag_success_p(&vb.vbt_clockrate.tag)) { return 0; } return le32toh(vb.vbt_clockrate.rate) * 2; }