usr/src/uts/sun4/io/tod.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 #include <sys/types.h>
  28 #include <sys/time.h>
  29 #include <sys/errno.h>
  30 #include <sys/cmn_err.h>
  31 #include <sys/param.h>
  32 #include <sys/modctl.h>
  33 #include <sys/conf.h>
  34 #include <sys/open.h>
  35 #include <sys/stat.h>
  36 #include <sys/clock.h>
  37 #include <sys/tod.h>
  38 #include <sys/todio.h>
  39 #include <sys/ddi.h>
  40 #include <sys/sunddi.h>
  41 #include <sys/file.h>
  42
  43
  44 #define getsoftc(minor) \
  45                 ((struct tod_softc *)ddi_get_soft_state(statep, (minor)))
  46
  47 /* dev_ops and cb_ops entry point function declarations */
  48
  49 static int      tod_attach(dev_info_t *, ddi_attach_cmd_t);
  50 static int      tod_detach(dev_info_t *, ddi_detach_cmd_t);
  51 static int      tod_getinfo(dev_info_t *, ddi_info_cmd_t, void *, void **);
  52
  53 static int      tod_open(dev_t *, int, int, cred_t *);
  54 static int      tod_close(dev_t, int, int, cred_t *);
  55 static int      tod_ioctl(dev_t, int, intptr_t, int, cred_t *, int *);
  56
  57 struct cb_ops tod_cb_ops = {
  58         tod_open,
  59         tod_close,
  60         nodev,
  61         nodev,
  62         nodev,                  /* dump */
  63         nodev,
  64         nodev,
  65         tod_ioctl,
  66         nodev,                  /* devmap */
  67         nodev,
  68         ddi_segmap,             /* segmap */
  69         nochpoll,
  70         ddi_prop_op,
  71         NULL,                   /* for STREAMS drivers */
  72         D_NEW | D_MP            /* driver compatibility flag */
  73 };
  74
  75 static struct dev_ops tod_dev_ops = {
  76         DEVO_REV,               /* driver build version */
  77         0,                      /* device reference count */
  78         tod_getinfo,
  79         nulldev,
  80         nulldev,                /* probe */
  81         tod_attach,
  82         tod_detach,
  83         nulldev,                /* reset */
  84         &tod_cb_ops,
  85         NULL,
  86         nulldev,                /* power */
  87         ddi_quiesce_not_supported,      /* devo_quiesce */
  88 };
  89
  90 /* module configuration stuff */
  91 static void    *statep;
  92 extern struct mod_ops mod_driverops;
  93
  94 static struct modldrv modldrv = {
  95         &mod_driverops,
  96         "tod driver",
  97         &tod_dev_ops
  98 };
  99
 100 static struct modlinkage modlinkage = {
 101         MODREV_1,
 102         &modldrv,
 103         0
 104 };
 105
 106
 107 int
 108 _init(void)
 109 {
 110         int    e;
 111
 112         if (e = ddi_soft_state_init(&statep, sizeof (struct tod_softc), 1)) {
 113                 return (e);
 114         }
 115
 116         if ((e = mod_install(&modlinkage)) != 0) {
 117                 ddi_soft_state_fini(&statep);
 118         }
 119
 120         return (e);
 121 }
 122
 123
 124 int
 125 _fini(void)
 126 {
 127         int e;
 128
 129         if ((e = mod_remove(&modlinkage)) != 0) {
 130                 return (e);
 131         }
 132
 133         ddi_soft_state_fini(&statep);
 134
 135         return (DDI_SUCCESS);
 136 }
 137
 138
 139 int
 140 _info(struct modinfo *modinfop)
 141 {
 142         return (mod_info(&modlinkage, modinfop));
 143 }
 144
 145
 146 /* ARGSUSED */
 147 static int
 148 tod_getinfo(dev_info_t *dip, ddi_info_cmd_t cmd, void *arg, void **result)
 149 {
 150         int     inst = getminor((dev_t)arg);
 151         int     retval = DDI_SUCCESS;
 152         struct tod_softc *softc;
 153
 154         switch (cmd) {
 155
 156         case DDI_INFO_DEVT2DEVINFO:
 157                 if ((softc = getsoftc(inst)) == NULL) {
 158                         *result = NULL;
 159                         retval = DDI_FAILURE;
 160                 } else {
 161                         *result = (void *)softc->dip;
 162                 }
 163                 break;
 164
 165         case DDI_INFO_DEVT2INSTANCE:
 166                 *result = (void *)(uintptr_t)inst;
 167                 break;
 168
 169         default:
 170                 retval = DDI_FAILURE;
 171         }
 172
 173         return (retval);
 174 }
 175
 176 static int
 177 tod_attach(dev_info_t *dip, ddi_attach_cmd_t cmd)
 178 {
 179
 180         int inst;
 181         struct tod_softc *softc = NULL;
 182         char name[80];
 183
 184         switch (cmd) {
 185
 186         case DDI_ATTACH:
 187                 inst = ddi_get_instance(dip);
 188                 /*
 189                  * Create minor node.  The minor device number, inst, has no
 190                  * meaning.  The model number above, which will be added to
 191                  * the device's softc, is used to direct peculiar behavior.
 192                  */
 193                 (void) sprintf(name, "tod%d", inst);
 194                 if (ddi_create_minor_node(dip, name, S_IFCHR, inst,
 195                     DDI_PSEUDO, NULL) == DDI_FAILURE)
 196                         goto attach_failed;
 197
 198                 /*
 199                  * Allocate a soft state structure for this instance.
 200                  */
 201                 if (ddi_soft_state_zalloc(statep, inst) != DDI_SUCCESS)
 202                         goto attach_failed;
 203
 204                 softc = getsoftc(inst);
 205                 softc->dip = dip;
 206                 softc->cpr_stage = ~TOD_SUSPENDED;
 207                 mutex_init(&softc->mutex, NULL, MUTEX_DRIVER, NULL);
 208                 ddi_report_dev(dip);
 209                 return (DDI_SUCCESS);
 210
 211         case DDI_RESUME:
 212                 inst = ddi_get_instance(dip);
 213                 softc = getsoftc(inst);
 214                 mutex_enter(&softc->mutex);
 215                 softc->cpr_stage = ~TOD_SUSPENDED;
 216                 mutex_exit(&softc->mutex);
 217                 return (DDI_SUCCESS);
 218
 219         default:
 220                 return (DDI_FAILURE);
 221         }
 222
 223 attach_failed:
 224         /* Free soft state, if allocated. remove minor node if added earlier */
 225         if (softc)
 226                 ddi_soft_state_free(statep, inst);
 227
 228         ddi_remove_minor_node(dip, NULL);
 229
 230         return (DDI_FAILURE);
 231 }
 232
 233 static int
 234 tod_detach(dev_info_t *dip, ddi_detach_cmd_t cmd)
 235 {
 236         int inst;
 237         struct tod_softc *softc;
 238
 239         switch (cmd) {
 240
 241         case DDI_DETACH:
 242                 inst = ddi_get_instance(dip);
 243                 if ((softc = getsoftc(inst)) == NULL)
 244                         return (ENXIO);
 245                 /*
 246                  * Free the soft state and remove minor node added earlier.
 247                  */
 248                 mutex_destroy(&softc->mutex);
 249                 ddi_soft_state_free(statep, inst);
 250                 ddi_remove_minor_node(dip, NULL);
 251                 return (DDI_SUCCESS);
 252
 253         case DDI_SUSPEND:
 254                 inst = ddi_get_instance(dip);
 255                 softc = getsoftc(inst);
 256                 mutex_enter(&softc->mutex);
 257                 softc->cpr_stage = TOD_SUSPENDED;
 258                 mutex_exit(&softc->mutex);
 259                 return (DDI_SUCCESS);
 260
 261         default:
 262                 return (DDI_FAILURE);
 263
 264         }
 265 }
 266
 267 /* ARGSUSED */
 268 static int
 269 tod_open(dev_t *devp, int flag, int otyp, cred_t *credp)
 270 {
 271         int     inst = getminor(*devp);
 272
 273         return (getsoftc(inst) == NULL ? ENXIO : 0);
 274 }
 275
 276
 277 /* ARGSUSED */
 278 static int
 279 tod_close(dev_t dev, int flag, int otyp, cred_t *credp)
 280 {
 281         int     inst = getminor(dev);
 282
 283         return (getsoftc(inst) == NULL ? ENXIO : 0);
 284 }
 285
 286
 287 /* ARGSUSED */
 288 static int
 289 tod_ioctl(dev_t dev, int cmd, intptr_t arg, int mode, cred_t *credp, int *rvalp)
 290 {
 291         int             inst = getminor(dev);
 292         struct tod_softc *softc;
 293         timestruc_t     ts;
 294
 295         if ((softc = getsoftc(inst)) == NULL)
 296                 return (ENXIO);
 297
 298         mutex_enter(&softc->mutex);
 299         while (softc->cpr_stage == TOD_SUSPENDED) {
 300                 mutex_exit(&softc->mutex);
 301                 (void) ddi_dev_is_needed(softc->dip, 0, 1);
 302                 mutex_enter(&softc->mutex);
 303         }
 304
 305         switch (cmd) {
 306
 307         case TOD_CLEAR_ALARM:
 308                 mutex_enter(&tod_lock);
 309                 tod_ops.tod_clear_power_alarm();
 310                 mutex_exit(&tod_lock);
 311                 break;
 312
 313         case TOD_SET_ALARM:
 314                 if ((mode & FMODELS) == FNATIVE) {
 315                         if (ddi_copyin((caddr_t)arg, (caddr_t)&ts.tv_sec,
 316                             sizeof (ts.tv_sec), mode) != 0) {
 317                                 mutex_exit(&softc->mutex);
 318                                 return (EFAULT);
 319                         }
 320                 } else {
 321                         time32_t time32;
 322
 323                         if (ddi_copyin((caddr_t)arg,
 324                             &time32, sizeof (time32), mode) != 0) {
 325                                 mutex_exit(&softc->mutex);
 326                                 return (EFAULT);
 327                         }
 328                         ts.tv_sec = (time_t)time32;
 329                 }
 330                 ts.tv_nsec = 0;
 331
 332                 mutex_enter(&tod_lock);
 333                 tod_ops.tod_set_power_alarm(ts);
 334                 mutex_exit(&tod_lock);
 335                 break;
 336
 337         case TOD_GET_DATE:
 338                 mutex_enter(&tod_lock);
 339                 ts = tod_ops.tod_get();
 340                 mutex_exit(&tod_lock);
 341
 342                 if ((mode & FMODELS) == FNATIVE) {
 343                         if (ddi_copyout((caddr_t)&ts.tv_sec, (caddr_t)arg,
 344                             sizeof (ts.tv_sec), mode) != 0) {
 345                                 mutex_exit(&softc->mutex);
 346                                 return (EFAULT);
 347                         }
 348                 } else {
 349                         time32_t time32;
 350
 351                         if (TIMEVAL_OVERFLOW(&ts)) {
 352                                 mutex_exit(&softc->mutex);
 353                                 return (EOVERFLOW);
 354                         }
 355
 356                         time32 = (time32_t)ts.tv_sec;
 357                         if (ddi_copyout(&time32,
 358                             (caddr_t)arg, sizeof (time32), mode) != 0) {
 359                                 mutex_exit(&softc->mutex);
 360                                 return (EFAULT);
 361                         }
 362                 }
 363                 break;
 364
 365         default:
 366                 mutex_exit(&softc->mutex);
 367                 return (EINVAL);
 368         }
 369
 370         mutex_exit(&softc->mutex);
 371         return (0);
 372 }