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tpm_isa.c revision 1.8 
      1 /*	$NetBSD: tpm_isa.c,v 1.8 2021/01/16 00:43:03 thorpej Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 2019 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by 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 /*
     33  * Copyright (c) 2008, 2009 Michael Shalayeff
     34  * Copyright (c) 2009, 2010 Hans-Joerg Hoexer
     35  * All rights reserved.
     36  *
     37  * Permission to use, copy, modify, and distribute this software for any
     38  * purpose with or without fee is hereby granted, provided that the above
     39  * copyright notice and this permission notice appear in all copies.
     40  *
     41  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
     42  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
     43  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
     44  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
     45  * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER IN
     46  * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
     47  * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
     48  */
     49 
     50 #include <sys/cdefs.h>
     51 __KERNEL_RCSID(0, "$NetBSD: tpm_isa.c,v 1.8 2021/01/16 00:43:03 thorpej Exp $");
     52 
     53 #include <sys/param.h>
     54 #include <sys/systm.h>
     55 #include <sys/device.h>
     56 #include <sys/bus.h>
     57 #include <sys/pmf.h>
     58 
     59 #include <dev/ic/tpmreg.h>
     60 #include <dev/ic/tpmvar.h>
     61 
     62 #include <dev/isa/isareg.h>
     63 #include <dev/isa/isavar.h>
     64 
     65 #include "ioconf.h"
     66 
     67 static int	tpm_isa_match(device_t, cfdata_t, void *);
     68 static void	tpm_isa_attach(device_t, device_t, void *);
     69 
     70 CFATTACH_DECL_NEW(tpm_isa, sizeof(struct tpm_softc), tpm_isa_match,
     71     tpm_isa_attach, NULL, NULL);
     72 
     73 static int
     74 tpm_isa_match(device_t parent, cfdata_t match, void *aux)
     75 {
     76 	struct isa_attach_args *ia = aux;
     77 	bus_space_tag_t bt = ia->ia_memt;
     78 	bus_space_handle_t bh;
     79 	int rv;
     80 
     81 	/* There can be only one. */
     82 	if (tpm_cd.cd_devs && tpm_cd.cd_devs[0])
     83 		return 0;
     84 
     85 	if (ia->ia_iomem[0].ir_addr == ISA_UNKNOWN_IOMEM)
     86 		return 0;
     87 
     88 	/* XXX: integer locator sign extension */
     89 	if (bus_space_map(bt, (unsigned int)ia->ia_iomem[0].ir_addr,
     90 	    TPM_SPACE_SIZE, 0, &bh))
     91 		return 0;
     92 
     93 	if ((rv = (*tpm_intf_tis12.probe)(bt, bh)) == 0) {
     94 		ia->ia_nio = 0;
     95 		ia->ia_io[0].ir_size = 0;
     96 		ia->ia_iomem[0].ir_size = TPM_SPACE_SIZE;
     97 	}
     98 	ia->ia_ndrq = 0;
     99 
    100 	bus_space_unmap(bt, bh, TPM_SPACE_SIZE);
    101 	return (rv == 0) ? 1 : 0;
    102 }
    103 
    104 static void
    105 tpm_isa_attach(device_t parent, device_t self, void *aux)
    106 {
    107 	struct tpm_softc *sc = device_private(self);
    108 	struct isa_attach_args *ia = aux;
    109 	bus_addr_t base;
    110 	bus_size_t size;
    111 	int rv;
    112 
    113 	base = (unsigned int)ia->ia_iomem[0].ir_addr;
    114 	size = TPM_SPACE_SIZE;
    115 
    116 	aprint_normal("\n");
    117 	aprint_naive("\n");
    118 
    119 	sc->sc_dev = self;
    120 	sc->sc_ver = TPM_1_2;
    121 	mutex_init(&sc->sc_lock, MUTEX_DEFAULT, IPL_NONE);
    122 	sc->sc_busy = false;
    123 	sc->sc_intf = &tpm_intf_tis12;
    124 	sc->sc_bt = ia->ia_memt;
    125 	if (bus_space_map(sc->sc_bt, base, size, 0, &sc->sc_bh)) {
    126 		aprint_error_dev(sc->sc_dev, "cannot map registers\n");
    127 		return;
    128 	}
    129 
    130 	if ((rv = (*sc->sc_intf->init)(sc)) != 0) {
    131 		aprint_error_dev(sc->sc_dev, "cannot init device, rv=%d\n", rv);
    132 		bus_space_unmap(sc->sc_bt, sc->sc_bh, size);
    133 		return;
    134 	}
    135 
    136 	if (!pmf_device_register(self, tpm_suspend, tpm_resume))
    137 		aprint_error_dev(self, "couldn't establish power handler\n");
    138 }
    139