Home | History | Annotate | Line # | Download | only in acpi
tpm_acpi.c revision 1.6.4.2 
      1 /* $NetBSD: tpm_acpi.c,v 1.6.4.2 2020/04/13 08:04:18 martin 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 1.6.4.2 2020/04/13 08:04:18 martin 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