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      1 /* $NetBSD: amdpcib_hpet.c,v 1.8 2011/07/01 18:22:08 dyoung Exp $ */
      2 
      3 /*
      4  * Copyright (c) 2006 Nicolas Joly
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. The name of the author may not be used to endorse or promote products
     16  *    derived from this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS
     19  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     20  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     21  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     22  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     23  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     24  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     25  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     26  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     27  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     28  * POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #include <sys/cdefs.h>
     32 __KERNEL_RCSID(0, "$NetBSD: amdpcib_hpet.c,v 1.8 2011/07/01 18:22:08 dyoung Exp $");
     33 
     34 #include <sys/systm.h>
     35 #include <sys/device.h>
     36 
     37 #include <sys/time.h>
     38 #include <sys/timetc.h>
     39 
     40 #include <sys/bus.h>
     41 
     42 #include <dev/pci/pcivar.h>
     43 #include <dev/pci/pcireg.h>
     44 #include <dev/pci/pcidevs.h>
     45 
     46 #include <dev/ic/hpetreg.h>
     47 #include <dev/ic/hpetvar.h>
     48 
     49 static int	amdpcib_hpet_match(device_t , cfdata_t , void *);
     50 static void	amdpcib_hpet_attach(device_t, device_t, void *);
     51 static int	amdpcib_hpet_detach(device_t, int);
     52 static pcireg_t amdpcib_hpet_addr(struct pci_attach_args *);
     53 
     54 CFATTACH_DECL_NEW(amdpcib_hpet, sizeof(struct hpet_softc),
     55     amdpcib_hpet_match, amdpcib_hpet_attach, amdpcib_hpet_detach, NULL);
     56 
     57 static int
     58 amdpcib_hpet_match(device_t parent, cfdata_t match, void *aux)
     59 {
     60 	struct pci_attach_args *pa = aux;
     61 	bus_space_handle_t bh;
     62 	bus_space_tag_t bt;
     63 	pcireg_t addr;
     64 
     65 	addr = amdpcib_hpet_addr(pa);
     66 
     67 	if (addr == 0)
     68 		return 0;
     69 
     70 	bt = pa->pa_memt;
     71 
     72 	if (bus_space_map(bt, addr, HPET_WINDOW_SIZE, 0, &bh) != 0)
     73 		return 0;
     74 
     75 	bus_space_unmap(bt, bh, HPET_WINDOW_SIZE);
     76 
     77 	return 1;
     78 }
     79 
     80 static void
     81 amdpcib_hpet_attach(device_t parent, device_t self, void *aux)
     82 {
     83 	struct hpet_softc *sc = device_private(self);
     84 	struct pci_attach_args *pa = aux;
     85 	pcireg_t addr;
     86 
     87 	sc->sc_mapped = false;
     88 	addr = amdpcib_hpet_addr(pa);
     89 
     90 	if (addr == 0) {
     91 		aprint_error(": failed to get address\n");
     92 		return;
     93 	}
     94 
     95 	sc->sc_memt = pa->pa_memt;
     96 	sc->sc_mems = HPET_WINDOW_SIZE;
     97 
     98 	if (bus_space_map(sc->sc_memt, addr, sc->sc_mems, 0, &sc->sc_memh)) {
     99 		aprint_error(": failed to map mem space\n");
    100 		return;
    101 	}
    102 
    103 	aprint_naive("\n");
    104 	aprint_normal(": high precision event timer (mem 0x%08x-0x%08x)\n",
    105 	    addr, addr + HPET_WINDOW_SIZE);
    106 
    107 	sc->sc_mapped = true;
    108 	hpet_attach_subr(self);
    109 }
    110 
    111 static int
    112 amdpcib_hpet_detach(device_t self, int flags)
    113 {
    114 	struct hpet_softc *sc = device_private(self);
    115 	int rv;
    116 
    117 	if (sc->sc_mapped != true)
    118 		return 0;
    119 
    120 	rv = hpet_detach(self, flags);
    121 
    122 	if (rv != 0)
    123 		return rv;
    124 
    125 	bus_space_unmap(sc->sc_memt, sc->sc_memh, sc->sc_mems);
    126 
    127 	return 0;
    128 }
    129 
    130 static pcireg_t
    131 amdpcib_hpet_addr(struct pci_attach_args *pa)
    132 {
    133 	pcireg_t conf;
    134 
    135 	conf = pci_conf_read(pa->pa_pc, pa->pa_tag, 0xa0);
    136 
    137 	if ((conf & 1) == 0)
    138 		return 0;
    139 
    140 	return conf & 0xfffffc00;
    141 }
    142