1 /* $NetBSD: tpm_acpi.c,v 1.11 2019/10/09 14:03:57 maxv 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 1.11 2019/10/09 14:03:57 maxv 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 /* 59 * Supported TPM 2.0 devices. 60 */ 61 static const char * const tpm2_acpi_ids[] = { 62 "MSFT0101", 63 NULL 64 }; 65 66 static int 67 tpm_acpi_match(device_t parent, cfdata_t match, void *aux) 68 { 69 struct acpi_attach_args *aa = aux; 70 ACPI_TABLE_TPM2 *tpm2; 71 ACPI_STATUS rv; 72 73 if (aa->aa_node->ad_type != ACPI_TYPE_DEVICE) 74 return 0; 75 76 /* We support only one TPM. */ 77 if (tpm_cd.cd_devs && tpm_cd.cd_devs[0]) 78 return 0; 79 80 if (!acpi_match_hid(aa->aa_node->ad_devinfo, tpm2_acpi_ids)) 81 return 0; 82 83 /* Make sure it uses TIS, and not CRB. */ 84 rv = AcpiGetTable(ACPI_SIG_TPM2, 1, (ACPI_TABLE_HEADER **)&tpm2); 85 if (ACPI_FAILURE(rv)) 86 return 0; 87 if (tpm2->StartMethod != ACPI_TPM2_MEMORY_MAPPED) 88 return 0; 89 90 return 1; 91 } 92 93 static void 94 tpm_acpi_attach(device_t parent, device_t self, void *aux) 95 { 96 struct tpm_softc *sc = device_private(self); 97 struct acpi_attach_args *aa = aux; 98 struct acpi_resources res; 99 struct acpi_mem *mem; 100 bus_addr_t base; 101 bus_addr_t size; 102 int rv; 103 104 rv = acpi_resource_parse(self, aa->aa_node->ad_handle, "_CRS", &res, 105 &acpi_resource_parse_ops_default); 106 if (ACPI_FAILURE(rv)) { 107 aprint_error_dev(self, "cannot parse resources %d\n", rv); 108 return; 109 } 110 111 mem = acpi_res_mem(&res, 0); 112 if (mem == NULL) { 113 aprint_error_dev(self, "cannot find mem\n"); 114 goto out; 115 } 116 if (mem->ar_length != TPM_SPACE_SIZE) { 117 aprint_error_dev(self, "wrong size mem %"PRIu64" != %u\n", 118 (uint64_t)mem->ar_length, TPM_SPACE_SIZE); 119 goto out; 120 } 121 base = mem->ar_base; 122 size = mem->ar_length; 123 124 sc->sc_dev = self; 125 sc->sc_ver = TPM_2_0; 126 mutex_init(&sc->sc_lock, MUTEX_DEFAULT, IPL_NONE); 127 sc->sc_busy = false; 128 sc->sc_intf = &tpm_intf_tis12; 129 sc->sc_bt = aa->aa_memt; 130 if (bus_space_map(sc->sc_bt, base, size, 0, &sc->sc_bh)) { 131 aprint_error_dev(sc->sc_dev, "cannot map registers\n"); 132 goto out; 133 } 134 135 if ((rv = (*sc->sc_intf->probe)(sc->sc_bt, sc->sc_bh)) != 0) { 136 aprint_error_dev(sc->sc_dev, "probe failed, rv=%d\n", rv); 137 goto out1; 138 } 139 if ((rv = (*sc->sc_intf->init)(sc)) != 0) { 140 aprint_error_dev(sc->sc_dev, "cannot init device, rv=%d\n", rv); 141 goto out1; 142 } 143 144 if (!pmf_device_register(self, tpm_suspend, tpm_resume)) 145 aprint_error_dev(self, "couldn't establish power handler\n"); 146 acpi_resource_cleanup(&res); 147 return; 148 149 out1: 150 bus_space_unmap(sc->sc_bt, sc->sc_bh, size); 151 out: 152 acpi_resource_cleanup(&res); 153 } 154