arch/arm/mach-omap2/powerdomain.c

   1 /*
   2  * OMAP powerdomain control
   3  *
   4  * Copyright (C) 2007-2008 Texas Instruments, Inc.
   5  * Copyright (C) 2007-2008 Nokia Corporation
   6  *
   7  * Written by Paul Walmsley
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13 #ifdef CONFIG_OMAP_DEBUG_POWERDOMAIN
  14 # define DEBUG
  15 #endif
  16
  17 #include <linux/kernel.h>
  18 #include <linux/module.h>
  19 #include <linux/types.h>
  20 #include <linux/delay.h>
  21 #include <linux/spinlock.h>
  22 #include <linux/list.h>
  23 #include <linux/errno.h>
  24 #include <linux/err.h>
  25 #include <linux/io.h>
  26
  27 #include <asm/atomic.h>
  28
  29 #include "cm.h"
  30 #include "cm-regbits-34xx.h"
  31 #include "prm.h"
  32 #include "prm-regbits-34xx.h"
  33
  34 #include <mach/cpu.h>
  35 #include <mach/powerdomain.h>
  36 #include <mach/clockdomain.h>
  37
  38 /* pwrdm_list contains all registered struct powerdomains */
  39 static LIST_HEAD(pwrdm_list);
  40
  41 /*
  42  * pwrdm_rwlock protects pwrdm_list add and del ops - also reused to
  43  * protect pwrdm_clkdms[] during clkdm add/del ops
  44  */
  45 static DEFINE_RWLOCK(pwrdm_rwlock);
  46
  47
  48 /* Private functions */
  49
  50 static u32 prm_read_mod_bits_shift(s16 domain, s16 idx, u32 mask)
  51 {
  52         u32 v;
  53
  54         v = prm_read_mod_reg(domain, idx);
  55         v &= mask;
  56         v >>= __ffs(mask);
  57
  58         return v;
  59 }
  60
  61 static struct powerdomain *_pwrdm_lookup(const char *name)
  62 {
  63         struct powerdomain *pwrdm, *temp_pwrdm;
  64
  65         pwrdm = NULL;
  66
  67         list_for_each_entry(temp_pwrdm, &pwrdm_list, node) {
  68                 if (!strcmp(name, temp_pwrdm->name)) {
  69                         pwrdm = temp_pwrdm;
  70                         break;
  71                 }
  72         }
  73
  74         return pwrdm;
  75 }
  76
  77 /* _pwrdm_deps_lookup - look up the specified powerdomain in a pwrdm list */
  78 static struct powerdomain *_pwrdm_deps_lookup(struct powerdomain *pwrdm,
  79                                               struct pwrdm_dep *deps)
  80 {
  81         struct pwrdm_dep *pd;
  82
  83         if (!pwrdm || !deps || !omap_chip_is(pwrdm->omap_chip))
  84                 return ERR_PTR(-EINVAL);
  85
  86         for (pd = deps; pd; pd++) {
  87
  88                 if (!omap_chip_is(pd->omap_chip))
  89                         continue;
  90
  91                 if (!pd->pwrdm && pd->pwrdm_name)
  92                         pd->pwrdm = pwrdm_lookup(pd->pwrdm_name);
  93
  94                 if (pd->pwrdm == pwrdm)
  95                         break;
  96
  97         }
  98
  99         if (!pd)
 100                 return ERR_PTR(-ENOENT);
 101
 102         return pd->pwrdm;
 103 }
 104
 105
 106 /* Public functions */
 107
 108 /**
 109  * pwrdm_init - set up the powerdomain layer
 110  *
 111  * Loop through the list of powerdomains, registering all that are
 112  * available on the current CPU. If pwrdm_list is supplied and not
 113  * null, all of the referenced powerdomains will be registered.  No
 114  * return value.
 115  */
 116 void pwrdm_init(struct powerdomain **pwrdm_list)
 117 {
 118         struct powerdomain **p = NULL;
 119
 120         if (pwrdm_list)
 121                 for (p = pwrdm_list; *p; p++)
 122                         pwrdm_register(*p);
 123 }
 124
 125 /**
 126  * pwrdm_register - register a powerdomain
 127  * @pwrdm: struct powerdomain * to register
 128  *
 129  * Adds a powerdomain to the internal powerdomain list.  Returns
 130  * -EINVAL if given a null pointer, -EEXIST if a powerdomain is
 131  * already registered by the provided name, or 0 upon success.
 132  */
 133 int pwrdm_register(struct powerdomain *pwrdm)
 134 {
 135         unsigned long flags;
 136         int ret = -EINVAL;
 137
 138         if (!pwrdm)
 139                 return -EINVAL;
 140
 141         if (!omap_chip_is(pwrdm->omap_chip))
 142                 return -EINVAL;
 143
 144         write_lock_irqsave(&pwrdm_rwlock, flags);
 145         if (_pwrdm_lookup(pwrdm->name)) {
 146                 ret = -EEXIST;
 147                 goto pr_unlock;
 148         }
 149
 150         list_add(&pwrdm->node, &pwrdm_list);
 151
 152         pr_debug("powerdomain: registered %s\n", pwrdm->name);
 153         ret = 0;
 154
 155 pr_unlock:
 156         write_unlock_irqrestore(&pwrdm_rwlock, flags);
 157
 158         return ret;
 159 }
 160
 161 /**
 162  * pwrdm_unregister - unregister a powerdomain
 163  * @pwrdm: struct powerdomain * to unregister
 164  *
 165  * Removes a powerdomain from the internal powerdomain list.  Returns
 166  * -EINVAL if pwrdm argument is NULL.
 167  */
 168 int pwrdm_unregister(struct powerdomain *pwrdm)
 169 {
 170         unsigned long flags;
 171
 172         if (!pwrdm)
 173                 return -EINVAL;
 174
 175         write_lock_irqsave(&pwrdm_rwlock, flags);
 176         list_del(&pwrdm->node);
 177         write_unlock_irqrestore(&pwrdm_rwlock, flags);
 178
 179         pr_debug("powerdomain: unregistered %s\n", pwrdm->name);
 180
 181         return 0;
 182 }
 183
 184 /**
 185  * pwrdm_lookup - look up a powerdomain by name, return a pointer
 186  * @name: name of powerdomain
 187  *
 188  * Find a registered powerdomain by its name.  Returns a pointer to the
 189  * struct powerdomain if found, or NULL otherwise.
 190  */
 191 struct powerdomain *pwrdm_lookup(const char *name)
 192 {
 193         struct powerdomain *pwrdm;
 194         unsigned long flags;
 195
 196         if (!name)
 197                 return NULL;
 198
 199         read_lock_irqsave(&pwrdm_rwlock, flags);
 200         pwrdm = _pwrdm_lookup(name);
 201         read_unlock_irqrestore(&pwrdm_rwlock, flags);
 202
 203         return pwrdm;
 204 }
 205
 206 /**
 207  * pwrdm_for_each - call function on each registered clockdomain
 208  * @fn: callback function *
 209  *
 210  * Call the supplied function for each registered powerdomain.  The
 211  * callback function can return anything but 0 to bail out early from
 212  * the iterator.  The callback function is called with the pwrdm_rwlock
 213  * held for reading, so no powerdomain structure manipulation
 214  * functions should be called from the callback, although hardware
 215  * powerdomain control functions are fine.  Returns the last return
 216  * value of the callback function, which should be 0 for success or
 217  * anything else to indicate failure; or -EINVAL if the function
 218  * pointer is null.
 219  */
 220 int pwrdm_for_each(int (*fn)(struct powerdomain *pwrdm))
 221 {
 222         struct powerdomain *temp_pwrdm;
 223         unsigned long flags;
 224         int ret = 0;
 225
 226         if (!fn)
 227                 return -EINVAL;
 228
 229         read_lock_irqsave(&pwrdm_rwlock, flags);
 230         list_for_each_entry(temp_pwrdm, &pwrdm_list, node) {
 231                 ret = (*fn)(temp_pwrdm);
 232                 if (ret)
 233                         break;
 234         }
 235         read_unlock_irqrestore(&pwrdm_rwlock, flags);
 236
 237         return ret;
 238 }
 239
 240 /**
 241  * pwrdm_add_clkdm - add a clockdomain to a powerdomain
 242  * @pwrdm: struct powerdomain * to add the clockdomain to
 243  * @clkdm: struct clockdomain * to associate with a powerdomain
 244  *
 245  * Associate the clockdomain 'clkdm' with a powerdomain 'pwrdm'.  This
 246  * enables the use of pwrdm_for_each_clkdm().  Returns -EINVAL if
 247  * presented with invalid pointers; -ENOMEM if memory could not be allocated;
 248  * or 0 upon success.
 249  */
 250 int pwrdm_add_clkdm(struct powerdomain *pwrdm, struct clockdomain *clkdm)
 251 {
 252         unsigned long flags;
 253         int i;
 254         int ret = -EINVAL;
 255
 256         if (!pwrdm || !clkdm)
 257                 return -EINVAL;
 258
 259         pr_debug("powerdomain: associating clockdomain %s with powerdomain "
 260                  "%s\n", clkdm->name, pwrdm->name);
 261
 262         write_lock_irqsave(&pwrdm_rwlock, flags);
 263
 264         for (i = 0; i < PWRDM_MAX_CLKDMS; i++) {
 265                 if (!pwrdm->pwrdm_clkdms[i])
 266                         break;
 267 #ifdef DEBUG
 268                 if (pwrdm->pwrdm_clkdms[i] == clkdm) {
 269                         ret = -EINVAL;
 270                         goto pac_exit;
 271                 }
 272 #endif
 273         }
 274
 275         if (i == PWRDM_MAX_CLKDMS) {
 276                 pr_debug("powerdomain: increase PWRDM_MAX_CLKDMS for "
 277                          "pwrdm %s clkdm %s\n", pwrdm->name, clkdm->name);
 278                 WARN_ON(1);
 279                 ret = -ENOMEM;
 280                 goto pac_exit;
 281         }
 282
 283         pwrdm->pwrdm_clkdms[i] = clkdm;
 284
 285         ret = 0;
 286
 287 pac_exit:
 288         write_unlock_irqrestore(&pwrdm_rwlock, flags);
 289
 290         return ret;
 291 }
 292
 293 /**
 294  * pwrdm_del_clkdm - remove a clockdomain from a powerdomain
 295  * @pwrdm: struct powerdomain * to add the clockdomain to
 296  * @clkdm: struct clockdomain * to associate with a powerdomain
 297  *
 298  * Dissociate the clockdomain 'clkdm' from the powerdomain
 299  * 'pwrdm'. Returns -EINVAL if presented with invalid pointers;
 300  * -ENOENT if the clkdm was not associated with the powerdomain, or 0
 301  * upon success.
 302  */
 303 int pwrdm_del_clkdm(struct powerdomain *pwrdm, struct clockdomain *clkdm)
 304 {
 305         unsigned long flags;
 306         int ret = -EINVAL;
 307         int i;
 308
 309         if (!pwrdm || !clkdm)
 310                 return -EINVAL;
 311
 312         pr_debug("powerdomain: dissociating clockdomain %s from powerdomain "
 313                  "%s\n", clkdm->name, pwrdm->name);
 314
 315         write_lock_irqsave(&pwrdm_rwlock, flags);
 316
 317         for (i = 0; i < PWRDM_MAX_CLKDMS; i++)
 318                 if (pwrdm->pwrdm_clkdms[i] == clkdm)
 319                         break;
 320
 321         if (i == PWRDM_MAX_CLKDMS) {
 322                 pr_debug("powerdomain: clkdm %s not associated with pwrdm "
 323                          "%s ?!\n", clkdm->name, pwrdm->name);
 324                 ret = -ENOENT;
 325                 goto pdc_exit;
 326         }
 327
 328         pwrdm->pwrdm_clkdms[i] = NULL;
 329
 330         ret = 0;
 331
 332 pdc_exit:
 333         write_unlock_irqrestore(&pwrdm_rwlock, flags);
 334
 335         return ret;
 336 }
 337
 338 /**
 339  * pwrdm_for_each_clkdm - call function on each clkdm in a pwrdm
 340  * @pwrdm: struct powerdomain * to iterate over
 341  * @fn: callback function *
 342  *
 343  * Call the supplied function for each clockdomain in the powerdomain
 344  * 'pwrdm'.  The callback function can return anything but 0 to bail
 345  * out early from the iterator.  The callback function is called with
 346  * the pwrdm_rwlock held for reading, so no powerdomain structure
 347  * manipulation functions should be called from the callback, although
 348  * hardware powerdomain control functions are fine.  Returns -EINVAL
 349  * if presented with invalid pointers; or passes along the last return
 350  * value of the callback function, which should be 0 for success or
 351  * anything else to indicate failure.
 352  */
 353 int pwrdm_for_each_clkdm(struct powerdomain *pwrdm,
 354                          int (*fn)(struct powerdomain *pwrdm,
 355                                    struct clockdomain *clkdm))
 356 {
 357         unsigned long flags;
 358         int ret = 0;
 359         int i;
 360
 361         if (!fn)
 362                 return -EINVAL;
 363
 364         read_lock_irqsave(&pwrdm_rwlock, flags);
 365
 366         for (i = 0; i < PWRDM_MAX_CLKDMS && !ret; i++)
 367                 ret = (*fn)(pwrdm, pwrdm->pwrdm_clkdms[i]);
 368
 369         read_unlock_irqrestore(&pwrdm_rwlock, flags);
 370
 371         return ret;
 372 }
 373
 374
 375 /**
 376  * pwrdm_add_wkdep - add a wakeup dependency from pwrdm2 to pwrdm1
 377  * @pwrdm1: wake this struct powerdomain * up (dependent)
 378  * @pwrdm2: when this struct powerdomain * wakes up (source)
 379  *
 380  * When the powerdomain represented by pwrdm2 wakes up (due to an
 381  * interrupt), wake up pwrdm1.  Implemented in hardware on the OMAP,
 382  * this feature is designed to reduce wakeup latency of the dependent
 383  * powerdomain.  Returns -EINVAL if presented with invalid powerdomain
 384  * pointers, -ENOENT if pwrdm2 cannot wake up pwrdm1 in hardware, or
 385  * 0 upon success.
 386  */
 387 int pwrdm_add_wkdep(struct powerdomain *pwrdm1, struct powerdomain *pwrdm2)
 388 {
 389         struct powerdomain *p;
 390
 391         if (!pwrdm1)
 392                 return -EINVAL;
 393
 394         p = _pwrdm_deps_lookup(pwrdm2, pwrdm1->wkdep_srcs);
 395         if (IS_ERR(p)) {
 396                 pr_debug("powerdomain: hardware cannot set/clear wake up of "
 397                          "%s when %s wakes up\n", pwrdm1->name, pwrdm2->name);
 398                 return IS_ERR(p);
 399         }
 400
 401         pr_debug("powerdomain: hardware will wake up %s when %s wakes up\n",
 402                  pwrdm1->name, pwrdm2->name);
 403
 404         prm_set_mod_reg_bits((1 << pwrdm2->dep_bit),
 405                              pwrdm1->prcm_offs, PM_WKDEP);
 406
 407         return 0;
 408 }
 409
 410 /**
 411  * pwrdm_del_wkdep - remove a wakeup dependency from pwrdm2 to pwrdm1
 412  * @pwrdm1: wake this struct powerdomain * up (dependent)
 413  * @pwrdm2: when this struct powerdomain * wakes up (source)
 414  *
 415  * Remove a wakeup dependency that causes pwrdm1 to wake up when pwrdm2
 416  * wakes up.  Returns -EINVAL if presented with invalid powerdomain
 417  * pointers, -ENOENT if pwrdm2 cannot wake up pwrdm1 in hardware, or
 418  * 0 upon success.
 419  */
 420 int pwrdm_del_wkdep(struct powerdomain *pwrdm1, struct powerdomain *pwrdm2)
 421 {
 422         struct powerdomain *p;
 423
 424         if (!pwrdm1)
 425                 return -EINVAL;
 426
 427         p = _pwrdm_deps_lookup(pwrdm2, pwrdm1->wkdep_srcs);
 428         if (IS_ERR(p)) {
 429                 pr_debug("powerdomain: hardware cannot set/clear wake up of "
 430                          "%s when %s wakes up\n", pwrdm1->name, pwrdm2->name);
 431                 return IS_ERR(p);
 432         }
 433
 434         pr_debug("powerdomain: hardware will no longer wake up %s after %s "
 435                  "wakes up\n", pwrdm1->name, pwrdm2->name);
 436
 437         prm_clear_mod_reg_bits((1 << pwrdm2->dep_bit),
 438                                pwrdm1->prcm_offs, PM_WKDEP);
 439
 440         return 0;
 441 }
 442
 443 /**
 444  * pwrdm_read_wkdep - read wakeup dependency state from pwrdm2 to pwrdm1
 445  * @pwrdm1: wake this struct powerdomain * up (dependent)
 446  * @pwrdm2: when this struct powerdomain * wakes up (source)
 447  *
 448  * Return 1 if a hardware wakeup dependency exists wherein pwrdm1 will be
 449  * awoken when pwrdm2 wakes up; 0 if dependency is not set; -EINVAL
 450  * if either powerdomain pointer is invalid; or -ENOENT if the hardware
 451  * is incapable.
 452  *
 453  * REVISIT: Currently this function only represents software-controllable
 454  * wakeup dependencies.  Wakeup dependencies fixed in hardware are not
 455  * yet handled here.
 456  */
 457 int pwrdm_read_wkdep(struct powerdomain *pwrdm1, struct powerdomain *pwrdm2)
 458 {
 459         struct powerdomain *p;
 460
 461         if (!pwrdm1)
 462                 return -EINVAL;
 463
 464         p = _pwrdm_deps_lookup(pwrdm2, pwrdm1->wkdep_srcs);
 465         if (IS_ERR(p)) {
 466                 pr_debug("powerdomain: hardware cannot set/clear wake up of "
 467                          "%s when %s wakes up\n", pwrdm1->name, pwrdm2->name);
 468                 return IS_ERR(p);
 469         }
 470
 471         return prm_read_mod_bits_shift(pwrdm1->prcm_offs, PM_WKDEP,
 472                                         (1 << pwrdm2->dep_bit));
 473 }
 474
 475 /**
 476  * pwrdm_add_sleepdep - add a sleep dependency from pwrdm2 to pwrdm1
 477  * @pwrdm1: prevent this struct powerdomain * from sleeping (dependent)
 478  * @pwrdm2: when this struct powerdomain * is active (source)
 479  *
 480  * Prevent pwrdm1 from automatically going inactive (and then to
 481  * retention or off) if pwrdm2 is still active.  Returns -EINVAL if
 482  * presented with invalid powerdomain pointers or called on a machine
 483  * that does not support software-configurable hardware sleep dependencies,
 484  * -ENOENT if the specified dependency cannot be set in hardware, or
 485  * 0 upon success.
 486  */
 487 int pwrdm_add_sleepdep(struct powerdomain *pwrdm1, struct powerdomain *pwrdm2)
 488 {
 489         struct powerdomain *p;
 490
 491         if (!pwrdm1)
 492                 return -EINVAL;
 493
 494         if (!cpu_is_omap34xx())
 495                 return -EINVAL;
 496
 497         p = _pwrdm_deps_lookup(pwrdm2, pwrdm1->sleepdep_srcs);
 498         if (IS_ERR(p)) {
 499                 pr_debug("powerdomain: hardware cannot set/clear sleep "
 500                          "dependency affecting %s from %s\n", pwrdm1->name,
 501                          pwrdm2->name);
 502                 return IS_ERR(p);
 503         }
 504
 505         pr_debug("powerdomain: will prevent %s from sleeping if %s is active\n",
 506                  pwrdm1->name, pwrdm2->name);
 507
 508         cm_set_mod_reg_bits((1 << pwrdm2->dep_bit),
 509                             pwrdm1->prcm_offs, OMAP3430_CM_SLEEPDEP);
 510
 511         return 0;
 512 }
 513
 514 /**
 515  * pwrdm_del_sleepdep - remove a sleep dependency from pwrdm2 to pwrdm1
 516  * @pwrdm1: prevent this struct powerdomain * from sleeping (dependent)
 517  * @pwrdm2: when this struct powerdomain * is active (source)
 518  *
 519  * Allow pwrdm1 to automatically go inactive (and then to retention or
 520  * off), independent of the activity state of pwrdm2.  Returns -EINVAL
 521  * if presented with invalid powerdomain pointers or called on a machine
 522  * that does not support software-configurable hardware sleep dependencies,
 523  * -ENOENT if the specified dependency cannot be cleared in hardware, or
 524  * 0 upon success.
 525  */
 526 int pwrdm_del_sleepdep(struct powerdomain *pwrdm1, struct powerdomain *pwrdm2)
 527 {
 528         struct powerdomain *p;
 529
 530         if (!pwrdm1)
 531                 return -EINVAL;
 532
 533         if (!cpu_is_omap34xx())
 534                 return -EINVAL;
 535
 536         p = _pwrdm_deps_lookup(pwrdm2, pwrdm1->sleepdep_srcs);
 537         if (IS_ERR(p)) {
 538                 pr_debug("powerdomain: hardware cannot set/clear sleep "
 539                          "dependency affecting %s from %s\n", pwrdm1->name,
 540                          pwrdm2->name);
 541                 return IS_ERR(p);
 542         }
 543
 544         pr_debug("powerdomain: will no longer prevent %s from sleeping if "
 545                  "%s is active\n", pwrdm1->name, pwrdm2->name);
 546
 547         cm_clear_mod_reg_bits((1 << pwrdm2->dep_bit),
 548                               pwrdm1->prcm_offs, OMAP3430_CM_SLEEPDEP);
 549
 550         return 0;
 551 }
 552
 553 /**
 554  * pwrdm_read_sleepdep - read sleep dependency state from pwrdm2 to pwrdm1
 555  * @pwrdm1: prevent this struct powerdomain * from sleeping (dependent)
 556  * @pwrdm2: when this struct powerdomain * is active (source)
 557  *
 558  * Return 1 if a hardware sleep dependency exists wherein pwrdm1 will
 559  * not be allowed to automatically go inactive if pwrdm2 is active;
 560  * 0 if pwrdm1's automatic power state inactivity transition is independent
 561  * of pwrdm2's; -EINVAL if either powerdomain pointer is invalid or called
 562  * on a machine that does not support software-configurable hardware sleep
 563  * dependencies; or -ENOENT if the hardware is incapable.
 564  *
 565  * REVISIT: Currently this function only represents software-controllable
 566  * sleep dependencies.  Sleep dependencies fixed in hardware are not
 567  * yet handled here.
 568  */
 569 int pwrdm_read_sleepdep(struct powerdomain *pwrdm1, struct powerdomain *pwrdm2)
 570 {
 571         struct powerdomain *p;
 572
 573         if (!pwrdm1)
 574                 return -EINVAL;
 575
 576         if (!cpu_is_omap34xx())
 577                 return -EINVAL;
 578
 579         p = _pwrdm_deps_lookup(pwrdm2, pwrdm1->sleepdep_srcs);
 580         if (IS_ERR(p)) {
 581                 pr_debug("powerdomain: hardware cannot set/clear sleep "
 582                          "dependency affecting %s from %s\n", pwrdm1->name,
 583                          pwrdm2->name);
 584                 return IS_ERR(p);
 585         }
 586
 587         return prm_read_mod_bits_shift(pwrdm1->prcm_offs, OMAP3430_CM_SLEEPDEP,
 588                                         (1 << pwrdm2->dep_bit));
 589 }
 590
 591 /**
 592  * pwrdm_get_mem_bank_count - get number of memory banks in this powerdomain
 593  * @pwrdm: struct powerdomain *
 594  *
 595  * Return the number of controllable memory banks in powerdomain pwrdm,
 596  * starting with 1.  Returns -EINVAL if the powerdomain pointer is null.
 597  */
 598 int pwrdm_get_mem_bank_count(struct powerdomain *pwrdm)
 599 {
 600         if (!pwrdm)
 601                 return -EINVAL;
 602
 603         return pwrdm->banks;
 604 }
 605
 606 /**
 607  * pwrdm_set_next_pwrst - set next powerdomain power state
 608  * @pwrdm: struct powerdomain * to set
 609  * @pwrst: one of the PWRDM_POWER_* macros
 610  *
 611  * Set the powerdomain pwrdm's next power state to pwrst.  The powerdomain
 612  * may not enter this state immediately if the preconditions for this state
 613  * have not been satisfied.  Returns -EINVAL if the powerdomain pointer is
 614  * null or if the power state is invalid for the powerdomin, or returns 0
 615  * upon success.
 616  */
 617 int pwrdm_set_next_pwrst(struct powerdomain *pwrdm, u8 pwrst)
 618 {
 619         if (!pwrdm)
 620                 return -EINVAL;
 621
 622         if (!(pwrdm->pwrsts & (1 << pwrst)))
 623                 return -EINVAL;
 624
 625         pr_debug("powerdomain: setting next powerstate for %s to %0x\n",
 626                  pwrdm->name, pwrst);
 627
 628         prm_rmw_mod_reg_bits(OMAP_POWERSTATE_MASK,
 629                              (pwrst << OMAP_POWERSTATE_SHIFT),
 630                              pwrdm->prcm_offs, PM_PWSTCTRL);
 631
 632         return 0;
 633 }
 634
 635 /**
 636  * pwrdm_read_next_pwrst - get next powerdomain power state
 637  * @pwrdm: struct powerdomain * to get power state
 638  *
 639  * Return the powerdomain pwrdm's next power state.  Returns -EINVAL
 640  * if the powerdomain pointer is null or returns the next power state
 641  * upon success.
 642  */
 643 int pwrdm_read_next_pwrst(struct powerdomain *pwrdm)
 644 {
 645         if (!pwrdm)
 646                 return -EINVAL;
 647
 648         return prm_read_mod_bits_shift(pwrdm->prcm_offs, PM_PWSTCTRL,
 649                                         OMAP_POWERSTATE_MASK);
 650 }
 651
 652 /**
 653  * pwrdm_read_pwrst - get current powerdomain power state
 654  * @pwrdm: struct powerdomain * to get power state
 655  *
 656  * Return the powerdomain pwrdm's current power state.  Returns -EINVAL
 657  * if the powerdomain pointer is null or returns the current power state
 658  * upon success.
 659  */
 660 int pwrdm_read_pwrst(struct powerdomain *pwrdm)
 661 {
 662         if (!pwrdm)
 663                 return -EINVAL;
 664
 665         return prm_read_mod_bits_shift(pwrdm->prcm_offs, PM_PWSTST,
 666                                         OMAP_POWERSTATEST_MASK);
 667 }
 668
 669 /**
 670  * pwrdm_read_prev_pwrst - get previous powerdomain power state
 671  * @pwrdm: struct powerdomain * to get previous power state
 672  *
 673  * Return the powerdomain pwrdm's previous power state.  Returns -EINVAL
 674  * if the powerdomain pointer is null or returns the previous power state
 675  * upon success.
 676  */
 677 int pwrdm_read_prev_pwrst(struct powerdomain *pwrdm)
 678 {
 679         if (!pwrdm)
 680                 return -EINVAL;
 681
 682         return prm_read_mod_bits_shift(pwrdm->prcm_offs, OMAP3430_PM_PREPWSTST,
 683                                         OMAP3430_LASTPOWERSTATEENTERED_MASK);
 684 }
 685
 686 /**
 687  * pwrdm_set_logic_retst - set powerdomain logic power state upon retention
 688  * @pwrdm: struct powerdomain * to set
 689  * @pwrst: one of the PWRDM_POWER_* macros
 690  *
 691  * Set the next power state that the logic portion of the powerdomain
 692  * pwrdm will enter when the powerdomain enters retention.  This will
 693  * be either RETENTION or OFF, if supported.  Returns -EINVAL if the
 694  * powerdomain pointer is null or the target power state is not not
 695  * supported, or returns 0 upon success.
 696  */
 697 int pwrdm_set_logic_retst(struct powerdomain *pwrdm, u8 pwrst)
 698 {
 699         if (!pwrdm)
 700                 return -EINVAL;
 701
 702         if (!(pwrdm->pwrsts_logic_ret & (1 << pwrst)))
 703                 return -EINVAL;
 704
 705         pr_debug("powerdomain: setting next logic powerstate for %s to %0x\n",
 706                  pwrdm->name, pwrst);
 707
 708         /*
 709          * The register bit names below may not correspond to the
 710          * actual names of the bits in each powerdomain's register,
 711          * but the type of value returned is the same for each
 712          * powerdomain.
 713          */
 714         prm_rmw_mod_reg_bits(OMAP3430_LOGICL1CACHERETSTATE,
 715                              (pwrst << __ffs(OMAP3430_LOGICL1CACHERETSTATE)),
 716                              pwrdm->prcm_offs, PM_PWSTCTRL);
 717
 718         return 0;
 719 }
 720
 721 /**
 722  * pwrdm_set_mem_onst - set memory power state while powerdomain ON
 723  * @pwrdm: struct powerdomain * to set
 724  * @bank: memory bank number to set (0-3)
 725  * @pwrst: one of the PWRDM_POWER_* macros
 726  *
 727  * Set the next power state that memory bank x of the powerdomain
 728  * pwrdm will enter when the powerdomain enters the ON state.  Bank
 729  * will be a number from 0 to 3, and represents different types of
 730  * memory, depending on the powerdomain.  Returns -EINVAL if the
 731  * powerdomain pointer is null or the target power state is not not
 732  * supported for this memory bank, -EEXIST if the target memory bank
 733  * does not exist or is not controllable, or returns 0 upon success.
 734  */
 735 int pwrdm_set_mem_onst(struct powerdomain *pwrdm, u8 bank, u8 pwrst)
 736 {
 737         u32 m;
 738
 739         if (!pwrdm)
 740                 return -EINVAL;
 741
 742         if (pwrdm->banks < (bank + 1))
 743                 return -EEXIST;
 744
 745         if (!(pwrdm->pwrsts_mem_on[bank] & (1 << pwrst)))
 746                 return -EINVAL;
 747
 748         pr_debug("powerdomain: setting next memory powerstate for domain %s "
 749                  "bank %0x while pwrdm-ON to %0x\n", pwrdm->name, bank, pwrst);
 750
 751         /*
 752          * The register bit names below may not correspond to the
 753          * actual names of the bits in each powerdomain's register,
 754          * but the type of value returned is the same for each
 755          * powerdomain.
 756          */
 757         switch (bank) {
 758         case 0:
 759                 m = OMAP3430_SHAREDL1CACHEFLATONSTATE_MASK;
 760                 break;
 761         case 1:
 762                 m = OMAP3430_L1FLATMEMONSTATE_MASK;
 763                 break;
 764         case 2:
 765                 m = OMAP3430_SHAREDL2CACHEFLATONSTATE_MASK;
 766                 break;
 767         case 3:
 768                 m = OMAP3430_L2FLATMEMONSTATE_MASK;
 769                 break;
 770         default:
 771                 WARN_ON(1); /* should never happen */
 772                 return -EEXIST;
 773         }
 774
 775         prm_rmw_mod_reg_bits(m, (pwrst << __ffs(m)),
 776                              pwrdm->prcm_offs, PM_PWSTCTRL);
 777
 778         return 0;
 779 }
 780
 781 /**
 782  * pwrdm_set_mem_retst - set memory power state while powerdomain in RET
 783  * @pwrdm: struct powerdomain * to set
 784  * @bank: memory bank number to set (0-3)
 785  * @pwrst: one of the PWRDM_POWER_* macros
 786  *
 787  * Set the next power state that memory bank x of the powerdomain
 788  * pwrdm will enter when the powerdomain enters the RETENTION state.
 789  * Bank will be a number from 0 to 3, and represents different types
 790  * of memory, depending on the powerdomain.  pwrst will be either
 791  * RETENTION or OFF, if supported. Returns -EINVAL if the powerdomain
 792  * pointer is null or the target power state is not not supported for
 793  * this memory bank, -EEXIST if the target memory bank does not exist
 794  * or is not controllable, or returns 0 upon success.
 795  */
 796 int pwrdm_set_mem_retst(struct powerdomain *pwrdm, u8 bank, u8 pwrst)
 797 {
 798         u32 m;
 799
 800         if (!pwrdm)
 801                 return -EINVAL;
 802
 803         if (pwrdm->banks < (bank + 1))
 804                 return -EEXIST;
 805
 806         if (!(pwrdm->pwrsts_mem_ret[bank] & (1 << pwrst)))
 807                 return -EINVAL;
 808
 809         pr_debug("powerdomain: setting next memory powerstate for domain %s "
 810                  "bank %0x while pwrdm-RET to %0x\n", pwrdm->name, bank, pwrst);
 811
 812         /*
 813          * The register bit names below may not correspond to the
 814          * actual names of the bits in each powerdomain's register,
 815          * but the type of value returned is the same for each
 816          * powerdomain.
 817          */
 818         switch (bank) {
 819         case 0:
 820                 m = OMAP3430_SHAREDL1CACHEFLATRETSTATE;
 821                 break;
 822         case 1:
 823                 m = OMAP3430_L1FLATMEMRETSTATE;
 824                 break;
 825         case 2:
 826                 m = OMAP3430_SHAREDL2CACHEFLATRETSTATE;
 827                 break;
 828         case 3:
 829                 m = OMAP3430_L2FLATMEMRETSTATE;
 830                 break;
 831         default:
 832                 WARN_ON(1); /* should never happen */
 833                 return -EEXIST;
 834         }
 835
 836         prm_rmw_mod_reg_bits(m, (pwrst << __ffs(m)), pwrdm->prcm_offs,
 837                              PM_PWSTCTRL);
 838
 839         return 0;
 840 }
 841
 842 /**
 843  * pwrdm_read_logic_pwrst - get current powerdomain logic retention power state
 844  * @pwrdm: struct powerdomain * to get current logic retention power state
 845  *
 846  * Return the current power state that the logic portion of
 847  * powerdomain pwrdm will enter
 848  * Returns -EINVAL if the powerdomain pointer is null or returns the
 849  * current logic retention power state upon success.
 850  */
 851 int pwrdm_read_logic_pwrst(struct powerdomain *pwrdm)
 852 {
 853         if (!pwrdm)
 854                 return -EINVAL;
 855
 856         return prm_read_mod_bits_shift(pwrdm->prcm_offs, PM_PWSTST,
 857                                         OMAP3430_LOGICSTATEST);
 858 }
 859
 860 /**
 861  * pwrdm_read_prev_logic_pwrst - get previous powerdomain logic power state
 862  * @pwrdm: struct powerdomain * to get previous logic power state
 863  *
 864  * Return the powerdomain pwrdm's logic power state.  Returns -EINVAL
 865  * if the powerdomain pointer is null or returns the previous logic
 866  * power state upon success.
 867  */
 868 int pwrdm_read_prev_logic_pwrst(struct powerdomain *pwrdm)
 869 {
 870         if (!pwrdm)
 871                 return -EINVAL;
 872
 873         /*
 874          * The register bit names below may not correspond to the
 875          * actual names of the bits in each powerdomain's register,
 876          * but the type of value returned is the same for each
 877          * powerdomain.
 878          */
 879         return prm_read_mod_bits_shift(pwrdm->prcm_offs, OMAP3430_PM_PREPWSTST,
 880                                         OMAP3430_LASTLOGICSTATEENTERED);
 881 }
 882
 883 /**
 884  * pwrdm_read_mem_pwrst - get current memory bank power state
 885  * @pwrdm: struct powerdomain * to get current memory bank power state
 886  * @bank: memory bank number (0-3)
 887  *
 888  * Return the powerdomain pwrdm's current memory power state for bank
 889  * x.  Returns -EINVAL if the powerdomain pointer is null, -EEXIST if
 890  * the target memory bank does not exist or is not controllable, or
 891  * returns the current memory power state upon success.
 892  */
 893 int pwrdm_read_mem_pwrst(struct powerdomain *pwrdm, u8 bank)
 894 {
 895         u32 m;
 896
 897         if (!pwrdm)
 898                 return -EINVAL;
 899
 900         if (pwrdm->banks < (bank + 1))
 901                 return -EEXIST;
 902
 903         /*
 904          * The register bit names below may not correspond to the
 905          * actual names of the bits in each powerdomain's register,
 906          * but the type of value returned is the same for each
 907          * powerdomain.
 908          */
 909         switch (bank) {
 910         case 0:
 911                 m = OMAP3430_SHAREDL1CACHEFLATSTATEST_MASK;
 912                 break;
 913         case 1:
 914                 m = OMAP3430_L1FLATMEMSTATEST_MASK;
 915                 break;
 916         case 2:
 917                 m = OMAP3430_SHAREDL2CACHEFLATSTATEST_MASK;
 918                 break;
 919         case 3:
 920                 m = OMAP3430_L2FLATMEMSTATEST_MASK;
 921                 break;
 922         default:
 923                 WARN_ON(1); /* should never happen */
 924                 return -EEXIST;
 925         }
 926
 927         return prm_read_mod_bits_shift(pwrdm->prcm_offs, PM_PWSTST, m);
 928 }
 929
 930 /**
 931  * pwrdm_read_prev_mem_pwrst - get previous memory bank power state
 932  * @pwrdm: struct powerdomain * to get previous memory bank power state
 933  * @bank: memory bank number (0-3)
 934  *
 935  * Return the powerdomain pwrdm's previous memory power state for bank
 936  * x.  Returns -EINVAL if the powerdomain pointer is null, -EEXIST if
 937  * the target memory bank does not exist or is not controllable, or
 938  * returns the previous memory power state upon success.
 939  */
 940 int pwrdm_read_prev_mem_pwrst(struct powerdomain *pwrdm, u8 bank)
 941 {
 942         u32 m;
 943
 944         if (!pwrdm)
 945                 return -EINVAL;
 946
 947         if (pwrdm->banks < (bank + 1))
 948                 return -EEXIST;
 949
 950         /*
 951          * The register bit names below may not correspond to the
 952          * actual names of the bits in each powerdomain's register,
 953          * but the type of value returned is the same for each
 954          * powerdomain.
 955          */
 956         switch (bank) {
 957         case 0:
 958                 m = OMAP3430_LASTMEM1STATEENTERED_MASK;
 959                 break;
 960         case 1:
 961                 m = OMAP3430_LASTMEM2STATEENTERED_MASK;
 962                 break;
 963         case 2:
 964                 m = OMAP3430_LASTSHAREDL2CACHEFLATSTATEENTERED_MASK;
 965                 break;
 966         case 3:
 967                 m = OMAP3430_LASTL2FLATMEMSTATEENTERED_MASK;
 968                 break;
 969         default:
 970                 WARN_ON(1); /* should never happen */
 971                 return -EEXIST;
 972         }
 973
 974         return prm_read_mod_bits_shift(pwrdm->prcm_offs,
 975                                         OMAP3430_PM_PREPWSTST, m);
 976 }
 977
 978 /**
 979  * pwrdm_clear_all_prev_pwrst - clear previous powerstate register for a pwrdm
 980  * @pwrdm: struct powerdomain * to clear
 981  *
 982  * Clear the powerdomain's previous power state register.  Clears the
 983  * entire register, including logic and memory bank previous power states.
 984  * Returns -EINVAL if the powerdomain pointer is null, or returns 0 upon
 985  * success.
 986  */
 987 int pwrdm_clear_all_prev_pwrst(struct powerdomain *pwrdm)
 988 {
 989         if (!pwrdm)
 990                 return -EINVAL;
 991
 992         /*
 993          * XXX should get the powerdomain's current state here;
 994          * warn & fail if it is not ON.
 995          */
 996
 997         pr_debug("powerdomain: clearing previous power state reg for %s\n",
 998                  pwrdm->name);
 999
1000         prm_write_mod_reg(0, pwrdm->prcm_offs, OMAP3430_PM_PREPWSTST);
1001
1002         return 0;
1003 }
1004
1005 /**
1006  * pwrdm_enable_hdwr_sar - enable automatic hardware SAR for a pwrdm
1007  * @pwrdm: struct powerdomain *
1008  *
1009  * Enable automatic context save-and-restore upon power state change
1010  * for some devices in a powerdomain.  Warning: this only affects a
1011  * subset of devices in a powerdomain; check the TRM closely.  Returns
1012  * -EINVAL if the powerdomain pointer is null or if the powerdomain
1013  * does not support automatic save-and-restore, or returns 0 upon
1014  * success.
1015  */
1016 int pwrdm_enable_hdwr_sar(struct powerdomain *pwrdm)
1017 {
1018         if (!pwrdm)
1019                 return -EINVAL;
1020
1021         if (!(pwrdm->flags & PWRDM_HAS_HDWR_SAR))
1022                 return -EINVAL;
1023
1024         pr_debug("powerdomain: %s: setting SAVEANDRESTORE bit\n",
1025                  pwrdm->name);
1026
1027         prm_rmw_mod_reg_bits(0, 1 << OMAP3430ES2_SAVEANDRESTORE_SHIFT,
1028                              pwrdm->prcm_offs, PM_PWSTCTRL);
1029
1030         return 0;
1031 }
1032
1033 /**
1034  * pwrdm_disable_hdwr_sar - disable automatic hardware SAR for a pwrdm
1035  * @pwrdm: struct powerdomain *
1036  *
1037  * Disable automatic context save-and-restore upon power state change
1038  * for some devices in a powerdomain.  Warning: this only affects a
1039  * subset of devices in a powerdomain; check the TRM closely.  Returns
1040  * -EINVAL if the powerdomain pointer is null or if the powerdomain
1041  * does not support automatic save-and-restore, or returns 0 upon
1042  * success.
1043  */
1044 int pwrdm_disable_hdwr_sar(struct powerdomain *pwrdm)
1045 {
1046         if (!pwrdm)
1047                 return -EINVAL;
1048
1049         if (!(pwrdm->flags & PWRDM_HAS_HDWR_SAR))
1050                 return -EINVAL;
1051
1052         pr_debug("powerdomain: %s: clearing SAVEANDRESTORE bit\n",
1053                  pwrdm->name);
1054
1055         prm_rmw_mod_reg_bits(1 << OMAP3430ES2_SAVEANDRESTORE_SHIFT, 0,
1056                              pwrdm->prcm_offs, PM_PWSTCTRL);
1057
1058         return 0;
1059 }
1060
1061 /**
1062  * pwrdm_has_hdwr_sar - test whether powerdomain supports hardware SAR
1063  * @pwrdm: struct powerdomain *
1064  *
1065  * Returns 1 if powerdomain 'pwrdm' supports hardware save-and-restore
1066  * for some devices, or 0 if it does not.
1067  */
1068 bool pwrdm_has_hdwr_sar(struct powerdomain *pwrdm)
1069 {
1070         return (pwrdm && pwrdm->flags & PWRDM_HAS_HDWR_SAR) ? 1 : 0;
1071 }
1072
1073 /**
1074  * pwrdm_wait_transition - wait for powerdomain power transition to finish
1075  * @pwrdm: struct powerdomain * to wait for
1076  *
1077  * If the powerdomain pwrdm is in the process of a state transition,
1078  * spin until it completes the power transition, or until an iteration
1079  * bailout value is reached. Returns -EINVAL if the powerdomain
1080  * pointer is null, -EAGAIN if the bailout value was reached, or
1081  * returns 0 upon success.
1082  */
1083 int pwrdm_wait_transition(struct powerdomain *pwrdm)
1084 {
1085         u32 c = 0;
1086
1087         if (!pwrdm)
1088                 return -EINVAL;
1089
1090         /*
1091          * REVISIT: pwrdm_wait_transition() may be better implemented
1092          * via a callback and a periodic timer check -- how long do we expect
1093          * powerdomain transitions to take?
1094          */
1095
1096         /* XXX Is this udelay() value meaningful? */
1097         while ((prm_read_mod_reg(pwrdm->prcm_offs, PM_PWSTST) &
1098                 OMAP_INTRANSITION) &&
1099                (c++ < PWRDM_TRANSITION_BAILOUT))
1100                 udelay(1);
1101
1102         if (c >= PWRDM_TRANSITION_BAILOUT) {
1103                 printk(KERN_ERR "powerdomain: waited too long for "
1104                        "powerdomain %s to complete transition\n", pwrdm->name);
1105                 return -EAGAIN;
1106         }
1107
1108         pr_debug("powerdomain: completed transition in %d loops\n", c);
1109
1110         return 0;
1111 }
1112
1113