dwiic_acpi.c revision 1.12
1 /* $NetBSD: dwiic_acpi.c,v 1.12 2025/09/15 15:31:45 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: dwiic_acpi.c,v 1.12 2025/09/15 15:31:45 thorpej Exp $"); 34 35 #include <sys/param.h> 36 #include <sys/bus.h> 37 #include <sys/cpu.h> 38 #include <sys/device.h> 39 40 #include <dev/acpi/acpireg.h> 41 #include <dev/acpi/acpivar.h> 42 #include <dev/acpi/acpi_intr.h> 43 44 #include <dev/ic/dwiic_var.h> 45 46 struct dwiic_acpi_param { 47 uint16_t hcnt; 48 uint16_t lcnt; 49 uint32_t ht; 50 }; 51 52 static int dwiic_acpi_match(device_t, cfdata_t, void *); 53 static void dwiic_acpi_attach(device_t, device_t, void *); 54 55 static void dwiic_acpi_parse_param(struct dwiic_softc *, ACPI_HANDLE, 56 const char *, struct dwiic_acpi_param *); 57 static void dwiic_acpi_configure(struct dwiic_softc *, ACPI_HANDLE); 58 59 CFATTACH_DECL_NEW(dwiic_acpi, sizeof(struct dwiic_softc), dwiic_acpi_match, dwiic_acpi_attach, NULL, NULL); 60 61 static const struct device_compatible_entry compat_data[] = { 62 { .compat = "AMD0010" }, /* AMD FCH */ 63 { .compat = "AMDI0010" }, /* AMD FCH */ 64 { .compat = "AMDI0510" }, /* AMD Seattle */ 65 { .compat = "APMC0D0F" }, /* Ampere eMAG */ 66 DEVICE_COMPAT_EOL 67 }; 68 69 static int 70 dwiic_acpi_match(device_t parent, cfdata_t cf, void *aux) 71 { 72 struct acpi_attach_args *aa = aux; 73 74 return acpi_compatible_match(aa, compat_data); 75 } 76 77 static void 78 dwiic_acpi_attach(device_t parent, device_t self, void *aux) 79 { 80 struct dwiic_softc * const sc = device_private(self); 81 struct acpi_attach_args *aa = aux; 82 struct acpi_resources res; 83 struct acpi_mem *mem; 84 struct acpi_irq *irq; 85 ACPI_STATUS rv; 86 int error; 87 void *ih; 88 89 sc->sc_dev = self; 90 sc->sc_type = dwiic_type_generic; 91 sc->sc_iot = aa->aa_memt; 92 93 rv = acpi_resource_parse(sc->sc_dev, aa->aa_node->ad_handle, "_CRS", 94 &res, &acpi_resource_parse_ops_default); 95 if (ACPI_FAILURE(rv)) 96 return; 97 98 mem = acpi_res_mem(&res, 0); 99 if (mem == NULL) { 100 aprint_error_dev(self, "couldn't find mem resource\n"); 101 goto done; 102 } 103 104 irq = acpi_res_irq(&res, 0); 105 if (irq == NULL) { 106 aprint_error_dev(self, "couldn't find irq resource\n"); 107 goto done; 108 } 109 110 error = bus_space_map(sc->sc_iot, mem->ar_base, mem->ar_length, 0, &sc->sc_ioh); 111 if (error) { 112 aprint_error_dev(self, "couldn't map registers\n"); 113 return; 114 } 115 116 ih = acpi_intr_establish(self, 117 (uint64_t)(uintptr_t)aa->aa_node->ad_handle, 118 IPL_VM, true, dwiic_intr, sc, device_xname(self)); 119 if (ih == NULL) { 120 aprint_error_dev(self, "couldn't install interrupt handler\n"); 121 bus_space_unmap(sc->sc_iot, sc->sc_ioh, mem->ar_length); 122 goto done; 123 } 124 125 dwiic_acpi_configure(sc, aa->aa_node->ad_handle); 126 127 if (!dwiic_attach(sc)) 128 goto done; 129 130 iicbus_attach(self, &sc->sc_i2c_tag); 131 132 pmf_device_register(self, dwiic_suspend, dwiic_resume); 133 134 done: 135 acpi_resource_cleanup(&res); 136 } 137 138 static void 139 dwiic_acpi_parse_param(struct dwiic_softc *sc, ACPI_HANDLE handle, const char *path, 140 struct dwiic_acpi_param *param) 141 { 142 ACPI_BUFFER buf; 143 ACPI_OBJECT *obj; 144 145 memset(param, 0, sizeof(*param)); 146 147 if (ACPI_FAILURE(acpi_eval_struct(handle, path, &buf))) 148 return; 149 150 obj = buf.Pointer; 151 if (obj->Type != ACPI_TYPE_PACKAGE || obj->Package.Count != 3) 152 goto done; 153 154 param->hcnt = (uint16_t)obj->Package.Elements[0].Integer.Value; 155 param->lcnt = (uint16_t)obj->Package.Elements[1].Integer.Value; 156 param->ht = (uint32_t)obj->Package.Elements[2].Integer.Value; 157 158 done: 159 ACPI_FREE(buf.Pointer); 160 } 161 162 static void 163 dwiic_acpi_configure(struct dwiic_softc *sc, ACPI_HANDLE handle) 164 { 165 struct dwiic_acpi_param sscn, fmcn; 166 167 dwiic_acpi_parse_param(sc, handle, "SSCN", &sscn); 168 sc->ss_hcnt = sscn.hcnt; 169 sc->ss_lcnt = sscn.lcnt; 170 171 dwiic_acpi_parse_param(sc, handle, "FMCN", &fmcn); 172 sc->fs_hcnt = fmcn.hcnt; 173 sc->fs_lcnt = fmcn.lcnt; 174 175 /* XXX */ 176 sc->sda_hold_time = fmcn.ht; 177 } 178
Indexes created Mon Sep 29 21:09:56 GMT 2025