1 /* $NetBSD: dwcwdt_acpi.c,v 1.1 2023/04/16 16:55:01 jmcneill Exp $ */ 2 3 /*- 4 * Copyright (c) 2023 Jared McNeill <jmcneill@invisible.ca> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 22 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __KERNEL_RCSID(0, "$NetBSD: dwcwdt_acpi.c,v 1.1 2023/04/16 16:55:01 jmcneill Exp $"); 31 32 #include <sys/param.h> 33 #include <sys/bus.h> 34 #include <sys/device.h> 35 #include <sys/intr.h> 36 #include <sys/systm.h> 37 #include <sys/mutex.h> 38 #include <sys/wdog.h> 39 40 #include <dev/sysmon/sysmonvar.h> 41 #include <dev/ic/dwc_wdt_var.h> 42 43 #include <dev/acpi/acpireg.h> 44 #include <dev/acpi/acpivar.h> 45 46 static const struct device_compatible_entry compat_data[] = { 47 { .compat = "snps,dw-wdt" }, 48 DEVICE_COMPAT_EOL 49 }; 50 51 static int 52 dwcwdt_acpi_match(device_t parent, cfdata_t cf, void *aux) 53 { 54 struct acpi_attach_args *aa = aux; 55 56 return acpi_compatible_match(aa, compat_data); 57 } 58 59 static void 60 dwcwdt_acpi_attach(device_t parent, device_t self, void *aux) 61 { 62 struct dwcwdt_softc * const sc = device_private(self); 63 struct acpi_attach_args *aa = aux; 64 ACPI_HANDLE handle = aa->aa_node->ad_handle; 65 struct acpi_resources res; 66 struct acpi_mem *mem; 67 ACPI_INTEGER ival; 68 ACPI_STATUS rv; 69 70 rv = acpi_resource_parse(sc->sc_dev, handle, "_CRS", 71 &res, &acpi_resource_parse_ops_default); 72 if (ACPI_FAILURE(rv)) { 73 return; 74 } 75 76 mem = acpi_res_mem(&res, 0); 77 if (mem == NULL) { 78 aprint_error_dev(self, "couldn't find mem resource\n"); 79 goto done; 80 } 81 82 sc->sc_dev = self; 83 sc->sc_bst = aa->aa_memt; 84 if (bus_space_map(sc->sc_bst, mem->ar_base, mem->ar_length, 85 0, &sc->sc_bsh) != 0) { 86 aprint_error_dev(self, "couldn't map registers\n"); 87 goto done; 88 } 89 if (ACPI_SUCCESS(acpi_dsd_integer(handle, "clock-frequency", &ival))) { 90 sc->sc_clkrate = ival; 91 } 92 93 dwcwdt_init(sc); 94 95 done: 96 acpi_resource_cleanup(&res); 97 } 98 99 CFATTACH_DECL_NEW(dwcwdt_acpi, sizeof(struct dwcwdt_softc), 100 dwcwdt_acpi_match, dwcwdt_acpi_attach, NULL, NULL); 101