sys/arch/mips/alchemy/dev/aurtc.c

   1 /* $NetBSD: aurtc.c,v 1.11 2006/09/04 23:45:30 gdamore Exp $ */
   2
   3 /*-
   4  * Copyright (c) 2006 Itronix Inc.
   5  * All rights reserved.
   6  *
   7  * Written by Garrett D'Amore for Itronix Inc.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  * 3. The name of Itronix Inc. may not be used to endorse
  18  *    or promote products derived from this software without specific
  19  *    prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY ITRONIX INC. ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  23  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  24  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL ITRONIX INC. BE LIABLE FOR ANY
  25  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  26  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  27  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  28  * ON ANY THEORY OF LIABILITY, WHETHER IN
  29  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  30  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  31  * POSSIBILITY OF SUCH DAMAGE.
  32  */
  33
  34 /*
  35  * Copyright 2002 Wasabi Systems, Inc.
  36  * All rights reserved.
  37  *
  38  * Written by Simon Burge for Wasabi Systems, Inc.
  39  *
  40  * Redistribution and use in source and binary forms, with or without
  41  * modification, are permitted provided that the following conditions
  42  * are met:
  43  * 1. Redistributions of source code must retain the above copyright
  44  *    notice, this list of conditions and the following disclaimer.
  45  * 2. Redistributions in binary form must reproduce the above copyright
  46  *    notice, this list of conditions and the following disclaimer in the
  47  *    documentation and/or other materials provided with the distribution.
  48  * 3. All advertising materials mentioning features or use of this software
  49  *    must display the following acknowledgement:
  50  *      This product includes software developed for the NetBSD Project by
  51  *      Wasabi Systems, Inc.
  52  * 4. The name of Wasabi Systems, Inc. may not be used to endorse
  53  *    or promote products derived from this software without specific prior
  54  *    written permission.
  55  *
  56  * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
  57  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  58  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  59  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL WASABI SYSTEMS, INC
  60  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  61  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  62  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  63  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  64  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  65  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  66  * POSSIBILITY OF SUCH DAMAGE.
  67  */
  68
  69
  70 #include <sys/cdefs.h>
  71 __KERNEL_RCSID(0, "$NetBSD: aurtc.c,v 1.11 2006/09/04 23:45:30 gdamore Exp $");
  72
  73 #include <sys/param.h>
  74 #include <sys/systm.h>
  75 #include <sys/errno.h>
  76 #include <sys/device.h>
  77 #include <sys/proc.h>
  78
  79 #include <dev/clock_subr.h>
  80
  81 #include <machine/bus.h>
  82
  83 #include <mips/alchemy/include/aureg.h>
  84 #include <mips/alchemy/include/auvar.h>
  85 #include <mips/alchemy/include/aubusvar.h>
  86
  87 #define REGVAL(x) (*(volatile uint32_t *)(MIPS_PHYS_TO_KSEG1(PC_BASE + (x))))
  88 #define GETREG(x)       (REGVAL(x))
  89 #define PUTREG(x,v)     (REGVAL(x) = (v))
  90
  91 struct aurtc_softc {
  92         struct device           sc_dev;
  93         struct todr_chip_handle sc_tch;
  94         void                    *sc_shutdownhook;
  95 };
  96
  97 static int      aurtc_match(struct device *, struct cfdata *, void *);
  98 static void     aurtc_attach(struct device *, struct device *, void *);
  99 static int      aurtc_gettime(todr_chip_handle_t, struct timeval *);
 100 static int      aurtc_settime(todr_chip_handle_t, struct timeval *);
 101 static void     aurtc_shutdown(void *);
 102
 103 CFATTACH_DECL(aurtc, sizeof (struct aurtc_softc),
 104     aurtc_match, aurtc_attach, NULL, NULL);
 105
 106 int
 107 aurtc_match(struct device *parent, struct cfdata *match, void *aux)
 108 {
 109         struct aubus_attach_args *aa = aux;
 110
 111         if (strcmp(aa->aa_name, match->cf_name) == 0)
 112                 return (1);
 113
 114         return (0);
 115 }
 116
 117 void
 118 aurtc_attach(struct device *parent, struct device *self, void *aux)
 119 {
 120         struct aurtc_softc *sc = (struct aurtc_softc *)self;
 121
 122         printf(": Au1X00 programmable clock\n");
 123
 124         sc->sc_tch.cookie = sc;
 125         sc->sc_tch.bus_cookie = NULL;
 126         sc->sc_tch.todr_gettime = aurtc_gettime;
 127         sc->sc_tch.todr_settime = aurtc_settime;
 128         sc->sc_tch.todr_setwen = NULL;
 129
 130         sc->sc_shutdownhook = shutdownhook_establish(aurtc_shutdown, NULL);
 131
 132         todr_attach(&sc->sc_tch);
 133 }
 134
 135 /*
 136  * Note that our RTC only has second resolution.
 137  */
 138
 139 int
 140 aurtc_gettime(todr_chip_handle_t tch, struct timeval *tv)
 141 {
 142         int                     s;
 143
 144         s = splclock();
 145         tv->tv_sec = GETREG(PC_COUNTER_READ_0);
 146         splx(s);
 147         return 0;
 148 }
 149
 150 int
 151 aurtc_settime(todr_chip_handle_t tch, struct timeval *tvp)
 152 {
 153         int                     s;
 154         struct timeval          tv;
 155
 156         s = splclock();
 157         tv = *tvp;
 158         splx(s);
 159
 160         /* wait for the clock register to be idle */
 161         while (GETREG(PC_COUNTER_CONTROL) & CC_C0S) {
 162                 continue;
 163         }
 164
 165         PUTREG(PC_COUNTER_WRITE0, tv.tv_sec);
 166
 167         /*
 168          * It could take a second or two for the clock change to take effect.
 169          * We don't want to make settimeofday() take that long, so we don't
 170          * wait here, but instead wait in flush.  This can have a bad effect
 171          * for settimeofday() calls with a short window between them.
 172          */
 173         return 0;
 174 }
 175
 176 void
 177 aurtc_shutdown(void *arg)
 178 {
 179
 180         /* wait for the clock register to be idle */
 181         while (GETREG(PC_COUNTER_CONTROL) & CC_C0S) {
 182                 continue;
 183         }
 184 }