1 /* $NetBSD: tpm_acpi.c,v 1.14 2021/11/14 21:18:30 riastradh Exp $ */ 2 3 /* 4 * Copyright (c) 2012, 2019 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Christos Zoulas and Maxime Villard. 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: tpm_acpi.c,v 1.14 2021/11/14 21:18:30 riastradh Exp $"); 34 35 #include <sys/param.h> 36 #include <sys/systm.h> 37 #include <sys/device.h> 38 #include <sys/bus.h> 39 #include <sys/pmf.h> 40 41 #include <dev/ic/tpmreg.h> 42 #include <dev/ic/tpmvar.h> 43 44 #include <dev/acpi/acpireg.h> 45 #include <dev/acpi/acpivar.h> 46 47 #include "ioconf.h" 48 49 #define _COMPONENT ACPI_RESOURCE_COMPONENT 50 ACPI_MODULE_NAME ("tpm_acpi") 51 52 static int tpm_acpi_match(device_t, cfdata_t, void *); 53 static void tpm_acpi_attach(device_t, device_t, void *); 54 55 CFATTACH_DECL_NEW(tpm_acpi, sizeof(struct tpm_softc), tpm_acpi_match, 56 tpm_acpi_attach, NULL, NULL); 57 58 static const struct device_compatible_entry compat_data[] = { 59 { .compat = "PNP0C31", .value = TPM_1_2 }, 60 { .compat = "MSFT0101", .value = TPM_2_0 }, 61 DEVICE_COMPAT_EOL 62 }; 63 64 static int 65 tpm_acpi_match(device_t parent, cfdata_t match, void *aux) 66 { 67 struct acpi_attach_args *aa = aux; 68 const struct device_compatible_entry *dce; 69 ACPI_TABLE_TPM2 *tpm2; 70 ACPI_STATUS rv; 71 int ret; 72 73 /* We support only one TPM. */ 74 if (tpm_cd.cd_devs && tpm_cd.cd_devs[0]) 75 return 0; 76 77 ret = acpi_compatible_match(aa, compat_data); 78 if (ret == 0) 79 return 0; 80 81 dce = acpi_compatible_lookup(aa, compat_data); 82 KASSERT(dce != NULL); 83 84 if (dce->value == TPM_1_2) { 85 /* XXX assume TPM 1.2 devices are memory-mapped. */ 86 return ret; 87 } 88 89 /* Make sure it uses TIS, and not CRB. */ 90 rv = AcpiGetTable(ACPI_SIG_TPM2, 1, (ACPI_TABLE_HEADER **)&tpm2); 91 if (ACPI_FAILURE(rv)) 92 return 0; 93 if (tpm2->StartMethod != ACPI_TPM2_MEMORY_MAPPED) 94 return 0; 95 96 return ret; 97 } 98 99 static void 100 tpm_acpi_attach(device_t parent, device_t self, void *aux) 101 { 102 struct tpm_softc *sc = device_private(self); 103 struct acpi_attach_args *aa = aux; 104 const struct device_compatible_entry *dce; 105 struct acpi_resources res; 106 struct acpi_mem *mem; 107 bus_addr_t base; 108 bus_addr_t size; 109 int rv; 110 111 rv = acpi_resource_parse(self, aa->aa_node->ad_handle, "_CRS", &res, 112 &acpi_resource_parse_ops_default); 113 if (ACPI_FAILURE(rv)) { 114 aprint_error_dev(self, "cannot parse resources %d\n", rv); 115 return; 116 } 117 118 mem = acpi_res_mem(&res, 0); 119 if (mem == NULL) { 120 aprint_error_dev(self, "cannot find mem\n"); 121 goto out; 122 } 123 if (mem->ar_length < TPM_SPACE_SIZE) { 124 aprint_error_dev(self, "wrong size mem %"PRIu64" < %u\n", 125 (uint64_t)mem->ar_length, TPM_SPACE_SIZE); 126 goto out; 127 } 128 base = mem->ar_base; 129 size = mem->ar_length; 130 131 dce = acpi_compatible_lookup(aa, compat_data); 132 KASSERT(dce != NULL); 133 134 sc->sc_dev = self; 135 sc->sc_ver = dce->value; 136 mutex_init(&sc->sc_lock, MUTEX_DEFAULT, IPL_NONE); 137 sc->sc_busy = false; 138 sc->sc_intf = &tpm_intf_tis12; 139 sc->sc_bt = aa->aa_memt; 140 if (bus_space_map(sc->sc_bt, base, size, 0, &sc->sc_bh)) { 141 aprint_error_dev(sc->sc_dev, "cannot map registers\n"); 142 goto out; 143 } 144 145 if ((rv = (*sc->sc_intf->probe)(sc->sc_bt, sc->sc_bh)) != 0) { 146 aprint_error_dev(sc->sc_dev, "probe failed, rv=%d\n", rv); 147 goto out1; 148 } 149 if ((rv = (*sc->sc_intf->init)(sc)) != 0) { 150 aprint_error_dev(sc->sc_dev, "cannot init device, rv=%d\n", rv); 151 goto out1; 152 } 153 154 if (!pmf_device_register(self, tpm_suspend, tpm_resume)) 155 aprint_error_dev(self, "couldn't establish power handler\n"); 156 acpi_resource_cleanup(&res); 157 return; 158 159 out1: 160 bus_space_unmap(sc->sc_bt, sc->sc_bh, size); 161 out: 162 acpi_resource_cleanup(&res); 163 } 164
Indexes created Sun Sep 21 16:09:51 GMT 2025