tpm_acpi.c revision 1.8
1 /* $NetBSD: tpm_acpi.c,v 1.8 2019/06/22 12:57:40 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 1.8 2019/06/22 12:57:40 maxv Exp $"); 34 35 #include <sys/param.h> 36 #include <sys/device.h> 37 #include <sys/systm.h> 38 #include <sys/device.h> 39 #include <sys/bus.h> 40 #include <sys/pmf.h> 41 42 #include <dev/ic/tpmreg.h> 43 #include <dev/ic/tpmvar.h> 44 45 #include <dev/acpi/acpireg.h> 46 #include <dev/acpi/acpivar.h> 47 48 #include <dev/isa/isavar.h> 49 50 #include "ioconf.h" 51 52 #define _COMPONENT ACPI_RESOURCE_COMPONENT 53 ACPI_MODULE_NAME ("tpm_acpi") 54 55 static int tpm_acpi_match(device_t, cfdata_t, void *); 56 static void tpm_acpi_attach(device_t, device_t, void *); 57 58 CFATTACH_DECL_NEW(tpm_acpi, sizeof(struct tpm_softc), tpm_acpi_match, 59 tpm_acpi_attach, NULL, NULL); 60 61 /* 62 * Supported TPM 2.0 devices. 63 */ 64 static const char * const tpm2_acpi_ids[] = { 65 "MSFT0101", 66 NULL 67 }; 68 69 static int 70 tpm_acpi_match(device_t parent, cfdata_t match, void *aux) 71 { 72 struct acpi_attach_args *aa = aux; 73 ACPI_TABLE_TPM2 *tpm2; 74 ACPI_STATUS rv; 75 76 if (aa->aa_node->ad_type != ACPI_TYPE_DEVICE) 77 return 0; 78 79 /* We support only one TPM. */ 80 if (tpm_cd.cd_devs && tpm_cd.cd_devs[0]) 81 return 0; 82 83 if (!acpi_match_hid(aa->aa_node->ad_devinfo, tpm2_acpi_ids)) 84 return 0; 85 86 /* Make sure it uses TIS, and not CRB. */ 87 rv = AcpiGetTable(ACPI_SIG_TPM2, 1, (ACPI_TABLE_HEADER **)&tpm2); 88 if (ACPI_FAILURE(rv)) 89 return 0; 90 if (tpm2->StartMethod != ACPI_TPM2_MEMORY_MAPPED) 91 return 0; 92 93 return 1; 94 } 95 96 static void 97 tpm_acpi_attach(device_t parent, device_t self, void *aux) 98 { 99 struct tpm_softc *sc = device_private(self); 100 struct acpi_attach_args *aa = aux; 101 struct acpi_resources res; 102 struct acpi_mem *mem; 103 struct acpi_irq *irq; 104 bus_addr_t base; 105 bus_addr_t size; 106 int rv, inum; 107 108 sc->sc_dev = self; 109 sc->sc_ver = TPM_2_0; 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(sc->sc_dev, "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(sc->sc_dev, "cannot find mem\n"); 121 goto out; 122 } 123 if (mem->ar_length != TPM_SPACE_SIZE) { 124 aprint_error_dev(sc->sc_dev, 125 "wrong size mem %"PRIu64" != %u\n", 126 (uint64_t)mem->ar_length, TPM_SPACE_SIZE); 127 goto out; 128 } 129 130 base = mem->ar_base; 131 size = mem->ar_length; 132 sc->sc_bt = aa->aa_memt; 133 sc->sc_init = tpm_tis12_init; 134 sc->sc_start = tpm_tis12_start; 135 sc->sc_read = tpm_tis12_read; 136 sc->sc_write = tpm_tis12_write; 137 sc->sc_end = tpm_tis12_end; 138 139 if (bus_space_map(sc->sc_bt, base, size, 0, &sc->sc_bh)) { 140 aprint_error_dev(sc->sc_dev, "cannot map registers\n"); 141 goto out; 142 } 143 144 if (!tpm_tis12_probe(sc->sc_bt, sc->sc_bh)) { 145 aprint_error_dev(sc->sc_dev, "TIS1.2 probe failed\n"); 146 goto out1; 147 } 148 149 irq = acpi_res_irq(&res, 0); 150 if (irq == NULL) 151 inum = -1; 152 else 153 inum = irq->ar_irq; 154 155 if ((rv = (*sc->sc_init)(sc, inum)) != 0) { 156 aprint_error_dev(sc->sc_dev, "cannot init device %d\n", rv); 157 goto out1; 158 } 159 160 if (inum != -1 && 161 (sc->sc_ih = isa_intr_establish(aa->aa_ic, irq->ar_irq, 162 IST_EDGE, IPL_TTY, tpm_intr, sc)) == NULL) { 163 aprint_error_dev(sc->sc_dev, "cannot establish interrupt\n"); 164 goto out1; 165 } 166 167 acpi_resource_cleanup(&res); 168 return; 169 170 out1: 171 bus_space_unmap(sc->sc_bt, sc->sc_bh, size); 172 out: 173 acpi_resource_cleanup(&res); 174 } 175
Indexes created Wed Sep 24 05:09:52 GMT 2025