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tpm_isa.c revision 1.2.42.1 
      1 /*	$NetBSD: tpm_isa.c,v 1.2.42.1 2017/05/02 03:19:18 pgoyette Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 2008, 2009 Michael Shalayeff
      5  * Copyright (c) 2009, 2010 Hans-Jrg Hxer
      6  * All rights reserved.
      7  *
      8  * Permission to use, copy, modify, and distribute this software for any
      9  * purpose with or without fee is hereby granted, provided that the above
     10  * copyright notice and this permission notice appear in all copies.
     11  *
     12  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
     13  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
     14  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
     15  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
     16  * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER IN
     17  * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
     18  * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
     19  */
     20 
     21 #include <sys/cdefs.h>
     22 __KERNEL_RCSID(0, "$NetBSD: tpm_isa.c,v 1.2.42.1 2017/05/02 03:19:18 pgoyette Exp $");
     23 
     24 #include <sys/param.h>
     25 #include <sys/systm.h>
     26 #include <sys/kernel.h>
     27 #include <sys/malloc.h>
     28 #include <sys/proc.h>
     29 #include <sys/device.h>
     30 #include <sys/bus.h>
     31 #include <sys/pmf.h>
     32 
     33 #include <dev/ic/tpmreg.h>
     34 #include <dev/ic/tpmvar.h>
     35 
     36 #include <dev/isa/isareg.h>
     37 #include <dev/isa/isavar.h>
     38 
     39 static int	tpm_isa_match(device_t, cfdata_t, void *);
     40 static void	tpm_isa_attach(device_t, device_t, void *);
     41 
     42 CFATTACH_DECL_NEW(tpm_isa, sizeof(struct tpm_softc),
     43     tpm_isa_match, tpm_isa_attach, NULL, NULL);
     44 
     45 extern struct cfdriver tpm_cd;
     46 
     47 static int
     48 tpm_isa_match(device_t parent, cfdata_t match, void *aux)
     49 {
     50 	struct isa_attach_args *ia = aux;
     51 	bus_space_tag_t bt = ia->ia_memt;
     52 	bus_space_handle_t bh;
     53 	int rv;
     54 
     55 	/* There can be only one. */
     56 	if (tpm_cd.cd_devs && tpm_cd.cd_devs[0])
     57 		return 0;
     58 
     59 	if (tpm_legacy_probe(ia->ia_iot, ia->ia_io[0].ir_addr)) {
     60 		ia->ia_io[0].ir_size = 2;
     61 		return 1;
     62 	}
     63 
     64 	if (ia->ia_iomem[0].ir_addr == ISA_UNKNOWN_IOMEM)
     65 		return 0;
     66 
     67 	/* XXX: integer locator sign extension */
     68 	if (bus_space_map(bt, (unsigned int)ia->ia_iomem[0].ir_addr, TPM_SIZE,
     69 	    0, &bh))
     70 		return 0;
     71 
     72 	if ((rv = tpm_tis12_probe(bt, bh))) {
     73 		ia->ia_nio = 0;
     74 		ia->ia_io[0].ir_size = 0;
     75 		ia->ia_iomem[0].ir_size = TPM_SIZE;
     76 	}
     77 	ia->ia_ndrq = 0;
     78 
     79 	bus_space_unmap(bt, bh, TPM_SIZE);
     80 	return rv;
     81 }
     82 
     83 static void
     84 tpm_isa_attach(device_t parent, device_t self, void *aux)
     85 {
     86 	struct tpm_softc *sc = device_private(self);
     87 	struct isa_attach_args *ia = aux;
     88 	bus_addr_t iobase;
     89 	bus_size_t size;
     90 	int rv;
     91 
     92 	sc->sc_dev = self;
     93 
     94 	if (tpm_legacy_probe(ia->ia_iot, ia->ia_io[0].ir_addr)) {
     95 		sc->sc_bt = ia->ia_iot;
     96 		iobase = (unsigned int)ia->ia_io[0].ir_addr;
     97 		size = ia->ia_io[0].ir_size;
     98 		sc->sc_batm = ia->ia_iot;
     99 		sc->sc_init = tpm_legacy_init;
    100 		sc->sc_start = tpm_legacy_start;
    101 		sc->sc_read = tpm_legacy_read;
    102 		sc->sc_write = tpm_legacy_write;
    103 		sc->sc_end = tpm_legacy_end;
    104 	} else {
    105 		sc->sc_bt = ia->ia_memt;
    106 		iobase = (unsigned int)ia->ia_iomem[0].ir_addr;
    107 		size = TPM_SIZE;
    108 		sc->sc_init = tpm_tis12_init;
    109 		sc->sc_start = tpm_tis12_start;
    110 		sc->sc_read = tpm_tis12_read;
    111 		sc->sc_write = tpm_tis12_write;
    112 		sc->sc_end = tpm_tis12_end;
    113 	}
    114 
    115 	if (bus_space_map(sc->sc_bt, iobase, size, 0, &sc->sc_bh)) {
    116 		aprint_error_dev(sc->sc_dev, "cannot map registers\n");
    117 		return;
    118 	}
    119 
    120 	if ((rv = (*sc->sc_init)(sc, ia->ia_irq[0].ir_irq,
    121 	    device_xname(sc->sc_dev))) != 0) {
    122 		bus_space_unmap(sc->sc_bt, sc->sc_bh, size);
    123 		return;
    124 	}
    125 
    126 	/*
    127 	 * Only setup interrupt handler when we have a vector and the
    128 	 * chip is TIS 1.2 compliant.
    129 	 */
    130 	if (sc->sc_init == tpm_tis12_init &&
    131 	    ia->ia_irq[0].ir_irq != ISA_UNKNOWN_IRQ &&
    132 	    (sc->sc_ih = isa_intr_establish_xname(ia->ia_ic,
    133 	     ia->ia_irq[0].ir_irq, IST_EDGE, IPL_TTY, tpm_intr, sc,
    134 	     device_xname(sc->sc_dev))) == NULL) {
    135 		bus_space_unmap(sc->sc_bt, sc->sc_bh, TPM_SIZE);
    136 		aprint_error_dev(sc->sc_dev, "cannot establish interrupt\n");
    137 		return;
    138 	}
    139 
    140 	if (!pmf_device_register(sc->sc_dev, tpm_suspend, tpm_resume))
    141 		aprint_error_dev(sc->sc_dev, "Cannot set power mgmt handler\n");
    142 }
    143