usr/src/uts/sun4u/io/todstarfire.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21 /*
  22  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
  23  * Use is subject to license terms.
  24  */
  25
  26 /*
  27  * tod driver module for Starfire
  28  * This module implements a soft tod since
  29  * starfire has no tod part.
  30  */
  31
  32 #include <sys/types.h>
  33 #include <sys/param.h>
  34 #include <sys/sysmacros.h>
  35 #include <sys/systm.h>
  36 #include <sys/errno.h>
  37 #include <sys/modctl.h>
  38 #include <sys/autoconf.h>
  39 #include <sys/debug.h>
  40 #include <sys/clock.h>
  41 #include <sys/cmn_err.h>
  42 #include <sys/promif.h>
  43 #include <sys/cpuvar.h>
  44 #include <sys/cpu_sgnblk_defs.h>
  45 #include <starfire/sys/cpu_sgn.h>
  46
  47 static timestruc_t      todsf_get(void);
  48 static void             todsf_set(timestruc_t);
  49 static uint_t           todsf_set_watchdog_timer(uint_t);
  50 static uint_t           todsf_clear_watchdog_timer(void);
  51 static void             todsf_set_power_alarm(timestruc_t);
  52 static void             todsf_clear_power_alarm(void);
  53 static uint64_t         todsf_get_cpufrequency(void);
  54
  55 /*
  56  * Module linkage information for the kernel.
  57  */
  58 static struct modlmisc modlmisc = {
  59         &mod_miscops, "Soft tod module for Starfire"
  60 };
  61
  62 static struct modlinkage modlinkage = {
  63         MODREV_1, (void *)&modlmisc, NULL
  64 };
  65
  66 int
  67 _init(void)
  68 {
  69         if (strcmp(tod_module_name, "todstarfire") == 0) {
  70                 int ssp_time32;
  71                 char obp_string[40];
  72
  73                 /* Set the string to pass to OBP */
  74                 (void) sprintf(obp_string, "h# %p unix-gettod",
  75                     (void *)&ssp_time32);
  76
  77                 /* Get OBP to get TOD from ssp */
  78                 prom_interpret(obp_string, 0, 0, 0, 0, 0);
  79
  80                 hrestime.tv_sec = (time_t)ssp_time32;
  81
  82                 tod_ops.tod_get = todsf_get;
  83                 tod_ops.tod_set = todsf_set;
  84                 tod_ops.tod_set_watchdog_timer = todsf_set_watchdog_timer;
  85                 tod_ops.tod_clear_watchdog_timer = todsf_clear_watchdog_timer;
  86                 tod_ops.tod_set_power_alarm = todsf_set_power_alarm;
  87                 tod_ops.tod_clear_power_alarm = todsf_clear_power_alarm;
  88                 tod_ops.tod_get_cpufrequency = todsf_get_cpufrequency;
  89
  90                 /*
  91                  * Flag warning if user tried to use hardware watchdog
  92                  */
  93                 if (watchdog_enable) {
  94                         cmn_err(CE_WARN, "Hardware watchdog unavailable");
  95                 }
  96         }
  97
  98         return (mod_install(&modlinkage));
  99 }
 100
 101 int
 102 _fini(void)
 103 {
 104         if (strcmp(tod_module_name, "todstarfire") == 0)
 105                 return (EBUSY);
 106         else
 107                 return (mod_remove(&modlinkage));
 108 }
 109
 110 int
 111 _info(struct modinfo *modinfop)
 112 {
 113         return (mod_info(&modlinkage, modinfop));
 114 }
 115
 116
 117 /*
 118  * Simply return hrestime value
 119  * Must be called with tod_lock held.
 120  */
 121 static timestruc_t
 122 todsf_get(void)
 123 {
 124         timestruc_t ts;
 125         extern cpu_sgnblk_t *cpu_sgnblkp[];
 126
 127         ASSERT(MUTEX_HELD(&tod_lock));
 128
 129         ts = hrestime;
 130
 131         /* Update the heartbeat */
 132         if (cpu_sgnblkp[CPU->cpu_id] != NULL)
 133                 cpu_sgnblkp[CPU->cpu_id]->sigb_heartbeat++;
 134         return (ts);
 135 }
 136
 137 /*
 138  * Null function for now.
 139  * Must be called with tod_lock held.
 140  */
 141 /* ARGSUSED */
 142 static void
 143 todsf_set(timestruc_t ts)
 144 {
 145         ASSERT(MUTEX_HELD(&tod_lock));
 146 }
 147
 148
 149 /*
 150  * No watchdog function.
 151  */
 152 /* ARGSUSED */
 153 static uint_t
 154 todsf_set_watchdog_timer(uint_t timeoutval)
 155 {
 156         ASSERT(MUTEX_HELD(&tod_lock));
 157         return (0);
 158 }
 159
 160 /*
 161  * No watchdog function
 162  */
 163 static uint_t
 164 todsf_clear_watchdog_timer(void)
 165 {
 166         ASSERT(MUTEX_HELD(&tod_lock));
 167         return (0);
 168 }
 169
 170 /*
 171  * Null function.
 172  */
 173 /* ARGSUSED */
 174 static void
 175 todsf_set_power_alarm(timestruc_t ts)
 176 {
 177         ASSERT(MUTEX_HELD(&tod_lock));
 178 }
 179
 180 /*
 181  * Null function
 182  */
 183 static void
 184 todsf_clear_power_alarm()
 185 {
 186         ASSERT(MUTEX_HELD(&tod_lock));
 187 }
 188
 189 /*
 190  * Get clock freq from the cpunode
 191  */
 192 uint64_t
 193 todsf_get_cpufrequency(void)
 194 {
 195         return (cpunodes[CPU->cpu_id].clock_freq);
 196 }