arch/arm/mach-omap2/powerdomain.c

   1 /*
   2  * OMAP powerdomain control
   3  *
   4  * Copyright (C) 2007-2008, 2011 Texas Instruments, Inc.
   5  * Copyright (C) 2007-2011 Nokia Corporation
   6  *
   7  * Written by Paul Walmsley
   8  * Added OMAP4 specific support by Abhijit Pagare <abhijitpagare@ti.com>
   9  * State counting code by Tero Kristo <tero.kristo@nokia.com>
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License version 2 as
  13  * published by the Free Software Foundation.
  14  */
  15 #undef DEBUG
  16
  17 #include <linux/kernel.h>
  18 #include <linux/types.h>
  19 #include <linux/list.h>
  20 #include <linux/errno.h>
  21 #include <linux/string.h>
  22 #include <linux/spinlock.h>
  23 #include <trace/events/power.h>
  24
  25 #include "cm2xxx_3xxx.h"
  26 #include "prcm44xx.h"
  27 #include "cm44xx.h"
  28 #include "prm2xxx_3xxx.h"
  29 #include "prm44xx.h"
  30
  31 #include <asm/cpu.h>
  32
  33 #include "powerdomain.h"
  34 #include "clockdomain.h"
  35 #include "voltage.h"
  36
  37 #include "soc.h"
  38 #include "pm.h"
  39
  40 #define PWRDM_TRACE_STATES_FLAG (1<<31)
  41
  42 enum {
  43         PWRDM_STATE_NOW = 0,
  44         PWRDM_STATE_PREV,
  45 };
  46
  47 /*
  48  * Types of sleep_switch used internally in omap_set_pwrdm_state()
  49  * and its associated static functions
  50  *
  51  * XXX Better documentation is needed here
  52  */
  53 #define ALREADYACTIVE_SWITCH            0
  54 #define FORCEWAKEUP_SWITCH              1
  55 #define LOWPOWERSTATE_SWITCH            2
  56
  57 /* pwrdm_list contains all registered struct powerdomains */
  58 static LIST_HEAD(pwrdm_list);
  59
  60 static struct pwrdm_ops *arch_pwrdm;
  61
  62 /* Private functions */
  63
  64 static struct powerdomain *_pwrdm_lookup(const char *name)
  65 {
  66         struct powerdomain *pwrdm, *temp_pwrdm;
  67
  68         pwrdm = NULL;
  69
  70         list_for_each_entry(temp_pwrdm, &pwrdm_list, node) {
  71                 if (!strcmp(name, temp_pwrdm->name)) {
  72                         pwrdm = temp_pwrdm;
  73                         break;
  74                 }
  75         }
  76
  77         return pwrdm;
  78 }
  79
  80 /**
  81  * _pwrdm_register - register a powerdomain
  82  * @pwrdm: struct powerdomain * to register
  83  *
  84  * Adds a powerdomain to the internal powerdomain list.  Returns
  85  * -EINVAL if given a null pointer, -EEXIST if a powerdomain is
  86  * already registered by the provided name, or 0 upon success.
  87  */
  88 static int _pwrdm_register(struct powerdomain *pwrdm)
  89 {
  90         int i;
  91         struct voltagedomain *voltdm;
  92
  93         if (!pwrdm || !pwrdm->name)
  94                 return -EINVAL;
  95
  96         if (cpu_is_omap44xx() &&
  97             pwrdm->prcm_partition == OMAP4430_INVALID_PRCM_PARTITION) {
  98                 pr_err("powerdomain: %s: missing OMAP4 PRCM partition ID\n",
  99                        pwrdm->name);
 100                 return -EINVAL;
 101         }
 102
 103         if (_pwrdm_lookup(pwrdm->name))
 104                 return -EEXIST;
 105
 106         if (arch_pwrdm && arch_pwrdm->pwrdm_has_voltdm)
 107                 if (!arch_pwrdm->pwrdm_has_voltdm())
 108                         goto skip_voltdm;
 109
 110         voltdm = voltdm_lookup(pwrdm->voltdm.name);
 111         if (!voltdm) {
 112                 pr_err("powerdomain: %s: voltagedomain %s does not exist\n",
 113                        pwrdm->name, pwrdm->voltdm.name);
 114                 return -EINVAL;
 115         }
 116         pwrdm->voltdm.ptr = voltdm;
 117         INIT_LIST_HEAD(&pwrdm->voltdm_node);
 118 skip_voltdm:
 119         spin_lock_init(&pwrdm->_lock);
 120
 121         list_add(&pwrdm->node, &pwrdm_list);
 122
 123         /* Initialize the powerdomain's state counter */
 124         for (i = 0; i < PWRDM_MAX_PWRSTS; i++)
 125                 pwrdm->state_counter[i] = 0;
 126
 127         pwrdm->ret_logic_off_counter = 0;
 128         for (i = 0; i < pwrdm->banks; i++)
 129                 pwrdm->ret_mem_off_counter[i] = 0;
 130
 131         if (arch_pwrdm && arch_pwrdm->pwrdm_wait_transition)
 132                 arch_pwrdm->pwrdm_wait_transition(pwrdm);
 133         pwrdm->state = pwrdm_read_pwrst(pwrdm);
 134         pwrdm->state_counter[pwrdm->state] = 1;
 135
 136         pr_debug("powerdomain: registered %s\n", pwrdm->name);
 137
 138         return 0;
 139 }
 140
 141 static void _update_logic_membank_counters(struct powerdomain *pwrdm)
 142 {
 143         int i;
 144         u8 prev_logic_pwrst, prev_mem_pwrst;
 145
 146         prev_logic_pwrst = pwrdm_read_prev_logic_pwrst(pwrdm);
 147         if ((pwrdm->pwrsts_logic_ret == PWRSTS_OFF_RET) &&
 148             (prev_logic_pwrst == PWRDM_POWER_OFF))
 149                 pwrdm->ret_logic_off_counter++;
 150
 151         for (i = 0; i < pwrdm->banks; i++) {
 152                 prev_mem_pwrst = pwrdm_read_prev_mem_pwrst(pwrdm, i);
 153
 154                 if ((pwrdm->pwrsts_mem_ret[i] == PWRSTS_OFF_RET) &&
 155                     (prev_mem_pwrst == PWRDM_POWER_OFF))
 156                         pwrdm->ret_mem_off_counter[i]++;
 157         }
 158 }
 159
 160 static int _pwrdm_state_switch(struct powerdomain *pwrdm, int flag)
 161 {
 162
 163         int prev, next, state, trace_state = 0;
 164
 165         if (pwrdm == NULL)
 166                 return -EINVAL;
 167
 168         state = pwrdm_read_pwrst(pwrdm);
 169
 170         switch (flag) {
 171         case PWRDM_STATE_NOW:
 172                 prev = pwrdm->state;
 173                 break;
 174         case PWRDM_STATE_PREV:
 175                 prev = pwrdm_read_prev_pwrst(pwrdm);
 176                 if (pwrdm->state != prev)
 177                         pwrdm->state_counter[prev]++;
 178                 if (prev == PWRDM_POWER_RET)
 179                         _update_logic_membank_counters(pwrdm);
 180                 /*
 181                  * If the power domain did not hit the desired state,
 182                  * generate a trace event with both the desired and hit states
 183                  */
 184                 next = pwrdm_read_next_pwrst(pwrdm);
 185                 if (next != prev) {
 186                         trace_state = (PWRDM_TRACE_STATES_FLAG |
 187                                        ((next & OMAP_POWERSTATE_MASK) << 8) |
 188                                        ((prev & OMAP_POWERSTATE_MASK) << 0));
 189                         trace_power_domain_target_rcuidle(pwrdm->name,
 190                                                           trace_state,
 191                                                           smp_processor_id());
 192                 }
 193                 break;
 194         default:
 195                 return -EINVAL;
 196         }
 197
 198         if (state != prev)
 199                 pwrdm->state_counter[state]++;
 200
 201         pm_dbg_update_time(pwrdm, prev);
 202
 203         pwrdm->state = state;
 204
 205         return 0;
 206 }
 207
 208 static int _pwrdm_pre_transition_cb(struct powerdomain *pwrdm, void *unused)
 209 {
 210         pwrdm_clear_all_prev_pwrst(pwrdm);
 211         _pwrdm_state_switch(pwrdm, PWRDM_STATE_NOW);
 212         return 0;
 213 }
 214
 215 static int _pwrdm_post_transition_cb(struct powerdomain *pwrdm, void *unused)
 216 {
 217         _pwrdm_state_switch(pwrdm, PWRDM_STATE_PREV);
 218         return 0;
 219 }
 220
 221 /**
 222  * _pwrdm_save_clkdm_state_and_activate - prepare for power state change
 223  * @pwrdm: struct powerdomain * to operate on
 224  * @curr_pwrst: current power state of @pwrdm
 225  * @pwrst: power state to switch to
 226  * @hwsup: ptr to a bool to return whether the clkdm is hardware-supervised
 227  *
 228  * Determine whether the powerdomain needs to be turned on before
 229  * attempting to switch power states.  Called by
 230  * omap_set_pwrdm_state().  NOTE that if the powerdomain contains
 231  * multiple clockdomains, this code assumes that the first clockdomain
 232  * supports software-supervised wakeup mode - potentially a problem.
 233  * Returns the power state switch mode currently in use (see the
 234  * "Types of sleep_switch" comment above).
 235  */
 236 static u8 _pwrdm_save_clkdm_state_and_activate(struct powerdomain *pwrdm,
 237                                                u8 curr_pwrst, u8 pwrst,
 238                                                bool *hwsup)
 239 {
 240         u8 sleep_switch;
 241
 242         if (curr_pwrst < PWRDM_POWER_ON) {
 243                 if (curr_pwrst > pwrst &&
 244                     pwrdm->flags & PWRDM_HAS_LOWPOWERSTATECHANGE &&
 245                     arch_pwrdm->pwrdm_set_lowpwrstchange) {
 246                         sleep_switch = LOWPOWERSTATE_SWITCH;
 247                 } else {
 248                         *hwsup = clkdm_in_hwsup(pwrdm->pwrdm_clkdms[0]);
 249                         clkdm_wakeup_nolock(pwrdm->pwrdm_clkdms[0]);
 250                         sleep_switch = FORCEWAKEUP_SWITCH;
 251                 }
 252         } else {
 253                 sleep_switch = ALREADYACTIVE_SWITCH;
 254         }
 255
 256         return sleep_switch;
 257 }
 258
 259 /**
 260  * _pwrdm_restore_clkdm_state - restore the clkdm hwsup state after pwrst change
 261  * @pwrdm: struct powerdomain * to operate on
 262  * @sleep_switch: return value from _pwrdm_save_clkdm_state_and_activate()
 263  * @hwsup: should @pwrdm's first clockdomain be set to hardware-supervised mode?
 264  *
 265  * Restore the clockdomain state perturbed by
 266  * _pwrdm_save_clkdm_state_and_activate(), and call the power state
 267  * bookkeeping code.  Called by omap_set_pwrdm_state().  NOTE that if
 268  * the powerdomain contains multiple clockdomains, this assumes that
 269  * the first associated clockdomain supports either
 270  * hardware-supervised idle control in the register, or
 271  * software-supervised sleep.  No return value.
 272  */
 273 static void _pwrdm_restore_clkdm_state(struct powerdomain *pwrdm,
 274                                        u8 sleep_switch, bool hwsup)
 275 {
 276         switch (sleep_switch) {
 277         case FORCEWAKEUP_SWITCH:
 278                 if (hwsup)
 279                         clkdm_allow_idle_nolock(pwrdm->pwrdm_clkdms[0]);
 280                 else
 281                         clkdm_sleep_nolock(pwrdm->pwrdm_clkdms[0]);
 282                 break;
 283         case LOWPOWERSTATE_SWITCH:
 284                 if (pwrdm->flags & PWRDM_HAS_LOWPOWERSTATECHANGE &&
 285                     arch_pwrdm->pwrdm_set_lowpwrstchange)
 286                         arch_pwrdm->pwrdm_set_lowpwrstchange(pwrdm);
 287                 pwrdm_state_switch_nolock(pwrdm);
 288                 break;
 289         }
 290 }
 291
 292 /* Public functions */
 293
 294 /**
 295  * pwrdm_register_platform_funcs - register powerdomain implementation fns
 296  * @po: func pointers for arch specific implementations
 297  *
 298  * Register the list of function pointers used to implement the
 299  * powerdomain functions on different OMAP SoCs.  Should be called
 300  * before any other pwrdm_register*() function.  Returns -EINVAL if
 301  * @po is null, -EEXIST if platform functions have already been
 302  * registered, or 0 upon success.
 303  */
 304 int pwrdm_register_platform_funcs(struct pwrdm_ops *po)
 305 {
 306         if (!po)
 307                 return -EINVAL;
 308
 309         if (arch_pwrdm)
 310                 return -EEXIST;
 311
 312         arch_pwrdm = po;
 313
 314         return 0;
 315 }
 316
 317 /**
 318  * pwrdm_register_pwrdms - register SoC powerdomains
 319  * @ps: pointer to an array of struct powerdomain to register
 320  *
 321  * Register the powerdomains available on a particular OMAP SoC.  Must
 322  * be called after pwrdm_register_platform_funcs().  May be called
 323  * multiple times.  Returns -EACCES if called before
 324  * pwrdm_register_platform_funcs(); -EINVAL if the argument @ps is
 325  * null; or 0 upon success.
 326  */
 327 int pwrdm_register_pwrdms(struct powerdomain **ps)
 328 {
 329         struct powerdomain **p = NULL;
 330
 331         if (!arch_pwrdm)
 332                 return -EEXIST;
 333
 334         if (!ps)
 335                 return -EINVAL;
 336
 337         for (p = ps; *p; p++)
 338                 _pwrdm_register(*p);
 339
 340         return 0;
 341 }
 342
 343 /**
 344  * pwrdm_complete_init - set up the powerdomain layer
 345  *
 346  * Do whatever is necessary to initialize registered powerdomains and
 347  * powerdomain code.  Currently, this programs the next power state
 348  * for each powerdomain to ON.  This prevents powerdomains from
 349  * unexpectedly losing context or entering high wakeup latency modes
 350  * with non-power-management-enabled kernels.  Must be called after
 351  * pwrdm_register_pwrdms().  Returns -EACCES if called before
 352  * pwrdm_register_pwrdms(), or 0 upon success.
 353  */
 354 int pwrdm_complete_init(void)
 355 {
 356         struct powerdomain *temp_p;
 357
 358         if (list_empty(&pwrdm_list))
 359                 return -EACCES;
 360
 361         list_for_each_entry(temp_p, &pwrdm_list, node)
 362                 pwrdm_set_next_pwrst(temp_p, PWRDM_POWER_ON);
 363
 364         return 0;
 365 }
 366
 367 /**
 368  * pwrdm_lock - acquire a Linux spinlock on a powerdomain
 369  * @pwrdm: struct powerdomain * to lock
 370  *
 371  * Acquire the powerdomain spinlock on @pwrdm.  No return value.
 372  */
 373 void pwrdm_lock(struct powerdomain *pwrdm)
 374         __acquires(&pwrdm->_lock)
 375 {
 376         spin_lock_irqsave(&pwrdm->_lock, pwrdm->_lock_flags);
 377 }
 378
 379 /**
 380  * pwrdm_unlock - release a Linux spinlock on a powerdomain
 381  * @pwrdm: struct powerdomain * to unlock
 382  *
 383  * Release the powerdomain spinlock on @pwrdm.  No return value.
 384  */
 385 void pwrdm_unlock(struct powerdomain *pwrdm)
 386         __releases(&pwrdm->_lock)
 387 {
 388         spin_unlock_irqrestore(&pwrdm->_lock, pwrdm->_lock_flags);
 389 }
 390
 391 /**
 392  * pwrdm_lookup - look up a powerdomain by name, return a pointer
 393  * @name: name of powerdomain
 394  *
 395  * Find a registered powerdomain by its name @name.  Returns a pointer
 396  * to the struct powerdomain if found, or NULL otherwise.
 397  */
 398 struct powerdomain *pwrdm_lookup(const char *name)
 399 {
 400         struct powerdomain *pwrdm;
 401
 402         if (!name)
 403                 return NULL;
 404
 405         pwrdm = _pwrdm_lookup(name);
 406
 407         return pwrdm;
 408 }
 409
 410 /**
 411  * pwrdm_for_each - call function on each registered clockdomain
 412  * @fn: callback function *
 413  *
 414  * Call the supplied function @fn for each registered powerdomain.
 415  * The callback function @fn can return anything but 0 to bail out
 416  * early from the iterator.  Returns the last return value of the
 417  * callback function, which should be 0 for success or anything else
 418  * to indicate failure; or -EINVAL if the function pointer is null.
 419  */
 420 int pwrdm_for_each(int (*fn)(struct powerdomain *pwrdm, void *user),
 421                    void *user)
 422 {
 423         struct powerdomain *temp_pwrdm;
 424         int ret = 0;
 425
 426         if (!fn)
 427                 return -EINVAL;
 428
 429         list_for_each_entry(temp_pwrdm, &pwrdm_list, node) {
 430                 ret = (*fn)(temp_pwrdm, user);
 431                 if (ret)
 432                         break;
 433         }
 434
 435         return ret;
 436 }
 437
 438 /**
 439  * pwrdm_add_clkdm - add a clockdomain to a powerdomain
 440  * @pwrdm: struct powerdomain * to add the clockdomain to
 441  * @clkdm: struct clockdomain * to associate with a powerdomain
 442  *
 443  * Associate the clockdomain @clkdm with a powerdomain @pwrdm.  This
 444  * enables the use of pwrdm_for_each_clkdm().  Returns -EINVAL if
 445  * presented with invalid pointers; -ENOMEM if memory could not be allocated;
 446  * or 0 upon success.
 447  */
 448 int pwrdm_add_clkdm(struct powerdomain *pwrdm, struct clockdomain *clkdm)
 449 {
 450         int i;
 451         int ret = -EINVAL;
 452
 453         if (!pwrdm || !clkdm)
 454                 return -EINVAL;
 455
 456         pr_debug("powerdomain: %s: associating clockdomain %s\n",
 457                  pwrdm->name, clkdm->name);
 458
 459         for (i = 0; i < PWRDM_MAX_CLKDMS; i++) {
 460                 if (!pwrdm->pwrdm_clkdms[i])
 461                         break;
 462 #ifdef DEBUG
 463                 if (pwrdm->pwrdm_clkdms[i] == clkdm) {
 464                         ret = -EINVAL;
 465                         goto pac_exit;
 466                 }
 467 #endif
 468         }
 469
 470         if (i == PWRDM_MAX_CLKDMS) {
 471                 pr_debug("powerdomain: %s: increase PWRDM_MAX_CLKDMS for clkdm %s\n",
 472                          pwrdm->name, clkdm->name);
 473                 WARN_ON(1);
 474                 ret = -ENOMEM;
 475                 goto pac_exit;
 476         }
 477
 478         pwrdm->pwrdm_clkdms[i] = clkdm;
 479
 480         ret = 0;
 481
 482 pac_exit:
 483         return ret;
 484 }
 485
 486 /**
 487  * pwrdm_get_mem_bank_count - get number of memory banks in this powerdomain
 488  * @pwrdm: struct powerdomain *
 489  *
 490  * Return the number of controllable memory banks in powerdomain @pwrdm,
 491  * starting with 1.  Returns -EINVAL if the powerdomain pointer is null.
 492  */
 493 int pwrdm_get_mem_bank_count(struct powerdomain *pwrdm)
 494 {
 495         if (!pwrdm)
 496                 return -EINVAL;
 497
 498         return pwrdm->banks;
 499 }
 500
 501 /**
 502  * pwrdm_set_next_pwrst - set next powerdomain power state
 503  * @pwrdm: struct powerdomain * to set
 504  * @pwrst: one of the PWRDM_POWER_* macros
 505  *
 506  * Set the powerdomain @pwrdm's next power state to @pwrst.  The powerdomain
 507  * may not enter this state immediately if the preconditions for this state
 508  * have not been satisfied.  Returns -EINVAL if the powerdomain pointer is
 509  * null or if the power state is invalid for the powerdomin, or returns 0
 510  * upon success.
 511  */
 512 int pwrdm_set_next_pwrst(struct powerdomain *pwrdm, u8 pwrst)
 513 {
 514         int ret = -EINVAL;
 515
 516         if (!pwrdm)
 517                 return -EINVAL;
 518
 519         if (!(pwrdm->pwrsts & (1 << pwrst)))
 520                 return -EINVAL;
 521
 522         pr_debug("powerdomain: %s: setting next powerstate to %0x\n",
 523                  pwrdm->name, pwrst);
 524
 525         if (arch_pwrdm && arch_pwrdm->pwrdm_set_next_pwrst) {
 526                 /* Trace the pwrdm desired target state */
 527                 trace_power_domain_target_rcuidle(pwrdm->name, pwrst,
 528                                                   smp_processor_id());
 529                 /* Program the pwrdm desired target state */
 530                 ret = arch_pwrdm->pwrdm_set_next_pwrst(pwrdm, pwrst);
 531         }
 532
 533         return ret;
 534 }
 535
 536 /**
 537  * pwrdm_read_next_pwrst - get next powerdomain power state
 538  * @pwrdm: struct powerdomain * to get power state
 539  *
 540  * Return the powerdomain @pwrdm's next power state.  Returns -EINVAL
 541  * if the powerdomain pointer is null or returns the next power state
 542  * upon success.
 543  */
 544 int pwrdm_read_next_pwrst(struct powerdomain *pwrdm)
 545 {
 546         int ret = -EINVAL;
 547
 548         if (!pwrdm)
 549                 return -EINVAL;
 550
 551         if (arch_pwrdm && arch_pwrdm->pwrdm_read_next_pwrst)
 552                 ret = arch_pwrdm->pwrdm_read_next_pwrst(pwrdm);
 553
 554         return ret;
 555 }
 556
 557 /**
 558  * pwrdm_read_pwrst - get current powerdomain power state
 559  * @pwrdm: struct powerdomain * to get power state
 560  *
 561  * Return the powerdomain @pwrdm's current power state. Returns -EINVAL
 562  * if the powerdomain pointer is null or returns the current power state
 563  * upon success. Note that if the power domain only supports the ON state
 564  * then just return ON as the current state.
 565  */
 566 int pwrdm_read_pwrst(struct powerdomain *pwrdm)
 567 {
 568         int ret = -EINVAL;
 569
 570         if (!pwrdm)
 571                 return -EINVAL;
 572
 573         if (pwrdm->pwrsts == PWRSTS_ON)
 574                 return PWRDM_POWER_ON;
 575
 576         if (arch_pwrdm && arch_pwrdm->pwrdm_read_pwrst)
 577                 ret = arch_pwrdm->pwrdm_read_pwrst(pwrdm);
 578
 579         return ret;
 580 }
 581
 582 /**
 583  * pwrdm_read_prev_pwrst - get previous powerdomain power state
 584  * @pwrdm: struct powerdomain * to get previous power state
 585  *
 586  * Return the powerdomain @pwrdm's previous power state.  Returns -EINVAL
 587  * if the powerdomain pointer is null or returns the previous power state
 588  * upon success.
 589  */
 590 int pwrdm_read_prev_pwrst(struct powerdomain *pwrdm)
 591 {
 592         int ret = -EINVAL;
 593
 594         if (!pwrdm)
 595                 return -EINVAL;
 596
 597         if (arch_pwrdm && arch_pwrdm->pwrdm_read_prev_pwrst)
 598                 ret = arch_pwrdm->pwrdm_read_prev_pwrst(pwrdm);
 599
 600         return ret;
 601 }
 602
 603 /**
 604  * pwrdm_set_logic_retst - set powerdomain logic power state upon retention
 605  * @pwrdm: struct powerdomain * to set
 606  * @pwrst: one of the PWRDM_POWER_* macros
 607  *
 608  * Set the next power state @pwrst that the logic portion of the
 609  * powerdomain @pwrdm will enter when the powerdomain enters retention.
 610  * This will be either RETENTION or OFF, if supported.  Returns
 611  * -EINVAL if the powerdomain pointer is null or the target power
 612  * state is not not supported, or returns 0 upon success.
 613  */
 614 int pwrdm_set_logic_retst(struct powerdomain *pwrdm, u8 pwrst)
 615 {
 616         int ret = -EINVAL;
 617
 618         if (!pwrdm)
 619                 return -EINVAL;
 620
 621         if (!(pwrdm->pwrsts_logic_ret & (1 << pwrst)))
 622                 return -EINVAL;
 623
 624         pr_debug("powerdomain: %s: setting next logic powerstate to %0x\n",
 625                  pwrdm->name, pwrst);
 626
 627         if (arch_pwrdm && arch_pwrdm->pwrdm_set_logic_retst)
 628                 ret = arch_pwrdm->pwrdm_set_logic_retst(pwrdm, pwrst);
 629
 630         return ret;
 631 }
 632
 633 /**
 634  * pwrdm_set_mem_onst - set memory power state while powerdomain ON
 635  * @pwrdm: struct powerdomain * to set
 636  * @bank: memory bank number to set (0-3)
 637  * @pwrst: one of the PWRDM_POWER_* macros
 638  *
 639  * Set the next power state @pwrst that memory bank @bank of the
 640  * powerdomain @pwrdm will enter when the powerdomain enters the ON
 641  * state.  @bank will be a number from 0 to 3, and represents different
 642  * types of memory, depending on the powerdomain.  Returns -EINVAL if
 643  * the powerdomain pointer is null or the target power state is not
 644  * not supported for this memory bank, -EEXIST if the target memory
 645  * bank does not exist or is not controllable, or returns 0 upon
 646  * success.
 647  */
 648 int pwrdm_set_mem_onst(struct powerdomain *pwrdm, u8 bank, u8 pwrst)
 649 {
 650         int ret = -EINVAL;
 651
 652         if (!pwrdm)
 653                 return -EINVAL;
 654
 655         if (pwrdm->banks < (bank + 1))
 656                 return -EEXIST;
 657
 658         if (!(pwrdm->pwrsts_mem_on[bank] & (1 << pwrst)))
 659                 return -EINVAL;
 660
 661         pr_debug("powerdomain: %s: setting next memory powerstate for bank %0x while pwrdm-ON to %0x\n",
 662                  pwrdm->name, bank, pwrst);
 663
 664         if (arch_pwrdm && arch_pwrdm->pwrdm_set_mem_onst)
 665                 ret = arch_pwrdm->pwrdm_set_mem_onst(pwrdm, bank, pwrst);
 666
 667         return ret;
 668 }
 669
 670 /**
 671  * pwrdm_set_mem_retst - set memory power state while powerdomain in RET
 672  * @pwrdm: struct powerdomain * to set
 673  * @bank: memory bank number to set (0-3)
 674  * @pwrst: one of the PWRDM_POWER_* macros
 675  *
 676  * Set the next power state @pwrst that memory bank @bank of the
 677  * powerdomain @pwrdm will enter when the powerdomain enters the
 678  * RETENTION state.  Bank will be a number from 0 to 3, and represents
 679  * different types of memory, depending on the powerdomain.  @pwrst
 680  * will be either RETENTION or OFF, if supported.  Returns -EINVAL if
 681  * the powerdomain pointer is null or the target power state is not
 682  * not supported for this memory bank, -EEXIST if the target memory
 683  * bank does not exist or is not controllable, or returns 0 upon
 684  * success.
 685  */
 686 int pwrdm_set_mem_retst(struct powerdomain *pwrdm, u8 bank, u8 pwrst)
 687 {
 688         int ret = -EINVAL;
 689
 690         if (!pwrdm)
 691                 return -EINVAL;
 692
 693         if (pwrdm->banks < (bank + 1))
 694                 return -EEXIST;
 695
 696         if (!(pwrdm->pwrsts_mem_ret[bank] & (1 << pwrst)))
 697                 return -EINVAL;
 698
 699         pr_debug("powerdomain: %s: setting next memory powerstate for bank %0x while pwrdm-RET to %0x\n",
 700                  pwrdm->name, bank, pwrst);
 701
 702         if (arch_pwrdm && arch_pwrdm->pwrdm_set_mem_retst)
 703                 ret = arch_pwrdm->pwrdm_set_mem_retst(pwrdm, bank, pwrst);
 704
 705         return ret;
 706 }
 707
 708 /**
 709  * pwrdm_read_logic_pwrst - get current powerdomain logic retention power state
 710  * @pwrdm: struct powerdomain * to get current logic retention power state
 711  *
 712  * Return the power state that the logic portion of powerdomain @pwrdm
 713  * will enter when the powerdomain enters retention.  Returns -EINVAL
 714  * if the powerdomain pointer is null or returns the logic retention
 715  * power state upon success.
 716  */
 717 int pwrdm_read_logic_pwrst(struct powerdomain *pwrdm)
 718 {
 719         int ret = -EINVAL;
 720
 721         if (!pwrdm)
 722                 return -EINVAL;
 723
 724         if (arch_pwrdm && arch_pwrdm->pwrdm_read_logic_pwrst)
 725                 ret = arch_pwrdm->pwrdm_read_logic_pwrst(pwrdm);
 726
 727         return ret;
 728 }
 729
 730 /**
 731  * pwrdm_read_prev_logic_pwrst - get previous powerdomain logic power state
 732  * @pwrdm: struct powerdomain * to get previous logic power state
 733  *
 734  * Return the powerdomain @pwrdm's previous logic power state.  Returns
 735  * -EINVAL if the powerdomain pointer is null or returns the previous
 736  * logic power state upon success.
 737  */
 738 int pwrdm_read_prev_logic_pwrst(struct powerdomain *pwrdm)
 739 {
 740         int ret = -EINVAL;
 741
 742         if (!pwrdm)
 743                 return -EINVAL;
 744
 745         if (arch_pwrdm && arch_pwrdm->pwrdm_read_prev_logic_pwrst)
 746                 ret = arch_pwrdm->pwrdm_read_prev_logic_pwrst(pwrdm);
 747
 748         return ret;
 749 }
 750
 751 /**
 752  * pwrdm_read_logic_retst - get next powerdomain logic power state
 753  * @pwrdm: struct powerdomain * to get next logic power state
 754  *
 755  * Return the powerdomain pwrdm's logic power state.  Returns -EINVAL
 756  * if the powerdomain pointer is null or returns the next logic
 757  * power state upon success.
 758  */
 759 int pwrdm_read_logic_retst(struct powerdomain *pwrdm)
 760 {
 761         int ret = -EINVAL;
 762
 763         if (!pwrdm)
 764                 return -EINVAL;
 765
 766         if (arch_pwrdm && arch_pwrdm->pwrdm_read_logic_retst)
 767                 ret = arch_pwrdm->pwrdm_read_logic_retst(pwrdm);
 768
 769         return ret;
 770 }
 771
 772 /**
 773  * pwrdm_read_mem_pwrst - get current memory bank power state
 774  * @pwrdm: struct powerdomain * to get current memory bank power state
 775  * @bank: memory bank number (0-3)
 776  *
 777  * Return the powerdomain @pwrdm's current memory power state for bank
 778  * @bank.  Returns -EINVAL if the powerdomain pointer is null, -EEXIST if
 779  * the target memory bank does not exist or is not controllable, or
 780  * returns the current memory power state upon success.
 781  */
 782 int pwrdm_read_mem_pwrst(struct powerdomain *pwrdm, u8 bank)
 783 {
 784         int ret = -EINVAL;
 785
 786         if (!pwrdm)
 787                 return ret;
 788
 789         if (pwrdm->banks < (bank + 1))
 790                 return ret;
 791
 792         if (pwrdm->flags & PWRDM_HAS_MPU_QUIRK)
 793                 bank = 1;
 794
 795         if (arch_pwrdm && arch_pwrdm->pwrdm_read_mem_pwrst)
 796                 ret = arch_pwrdm->pwrdm_read_mem_pwrst(pwrdm, bank);
 797
 798         return ret;
 799 }
 800
 801 /**
 802  * pwrdm_read_prev_mem_pwrst - get previous memory bank power state
 803  * @pwrdm: struct powerdomain * to get previous memory bank power state
 804  * @bank: memory bank number (0-3)
 805  *
 806  * Return the powerdomain @pwrdm's previous memory power state for
 807  * bank @bank.  Returns -EINVAL if the powerdomain pointer is null,
 808  * -EEXIST if the target memory bank does not exist or is not
 809  * controllable, or returns the previous memory power state upon
 810  * success.
 811  */
 812 int pwrdm_read_prev_mem_pwrst(struct powerdomain *pwrdm, u8 bank)
 813 {
 814         int ret = -EINVAL;
 815
 816         if (!pwrdm)
 817                 return ret;
 818
 819         if (pwrdm->banks < (bank + 1))
 820                 return ret;
 821
 822         if (pwrdm->flags & PWRDM_HAS_MPU_QUIRK)
 823                 bank = 1;
 824
 825         if (arch_pwrdm && arch_pwrdm->pwrdm_read_prev_mem_pwrst)
 826                 ret = arch_pwrdm->pwrdm_read_prev_mem_pwrst(pwrdm, bank);
 827
 828         return ret;
 829 }
 830
 831 /**
 832  * pwrdm_read_mem_retst - get next memory bank power state
 833  * @pwrdm: struct powerdomain * to get mext memory bank power state
 834  * @bank: memory bank number (0-3)
 835  *
 836  * Return the powerdomain pwrdm's next memory power state for bank
 837  * x.  Returns -EINVAL if the powerdomain pointer is null, -EEXIST if
 838  * the target memory bank does not exist or is not controllable, or
 839  * returns the next memory power state upon success.
 840  */
 841 int pwrdm_read_mem_retst(struct powerdomain *pwrdm, u8 bank)
 842 {
 843         int ret = -EINVAL;
 844
 845         if (!pwrdm)
 846                 return ret;
 847
 848         if (pwrdm->banks < (bank + 1))
 849                 return ret;
 850
 851         if (arch_pwrdm && arch_pwrdm->pwrdm_read_mem_retst)
 852                 ret = arch_pwrdm->pwrdm_read_mem_retst(pwrdm, bank);
 853
 854         return ret;
 855 }
 856
 857 /**
 858  * pwrdm_clear_all_prev_pwrst - clear previous powerstate register for a pwrdm
 859  * @pwrdm: struct powerdomain * to clear
 860  *
 861  * Clear the powerdomain's previous power state register @pwrdm.
 862  * Clears the entire register, including logic and memory bank
 863  * previous power states.  Returns -EINVAL if the powerdomain pointer
 864  * is null, or returns 0 upon success.
 865  */
 866 int pwrdm_clear_all_prev_pwrst(struct powerdomain *pwrdm)
 867 {
 868         int ret = -EINVAL;
 869
 870         if (!pwrdm)
 871                 return ret;
 872
 873         /*
 874          * XXX should get the powerdomain's current state here;
 875          * warn & fail if it is not ON.
 876          */
 877
 878         pr_debug("powerdomain: %s: clearing previous power state reg\n",
 879                  pwrdm->name);
 880
 881         if (arch_pwrdm && arch_pwrdm->pwrdm_clear_all_prev_pwrst)
 882                 ret = arch_pwrdm->pwrdm_clear_all_prev_pwrst(pwrdm);
 883
 884         return ret;
 885 }
 886
 887 /**
 888  * pwrdm_enable_hdwr_sar - enable automatic hardware SAR for a pwrdm
 889  * @pwrdm: struct powerdomain *
 890  *
 891  * Enable automatic context save-and-restore upon power state change
 892  * for some devices in the powerdomain @pwrdm.  Warning: this only
 893  * affects a subset of devices in a powerdomain; check the TRM
 894  * closely.  Returns -EINVAL if the powerdomain pointer is null or if
 895  * the powerdomain does not support automatic save-and-restore, or
 896  * returns 0 upon success.
 897  */
 898 int pwrdm_enable_hdwr_sar(struct powerdomain *pwrdm)
 899 {
 900         int ret = -EINVAL;
 901
 902         if (!pwrdm)
 903                 return ret;
 904
 905         if (!(pwrdm->flags & PWRDM_HAS_HDWR_SAR))
 906                 return ret;
 907
 908         pr_debug("powerdomain: %s: setting SAVEANDRESTORE bit\n", pwrdm->name);
 909
 910         if (arch_pwrdm && arch_pwrdm->pwrdm_enable_hdwr_sar)
 911                 ret = arch_pwrdm->pwrdm_enable_hdwr_sar(pwrdm);
 912
 913         return ret;
 914 }
 915
 916 /**
 917  * pwrdm_disable_hdwr_sar - disable automatic hardware SAR for a pwrdm
 918  * @pwrdm: struct powerdomain *
 919  *
 920  * Disable automatic context save-and-restore upon power state change
 921  * for some devices in the powerdomain @pwrdm.  Warning: this only
 922  * affects a subset of devices in a powerdomain; check the TRM
 923  * closely.  Returns -EINVAL if the powerdomain pointer is null or if
 924  * the powerdomain does not support automatic save-and-restore, or
 925  * returns 0 upon success.
 926  */
 927 int pwrdm_disable_hdwr_sar(struct powerdomain *pwrdm)
 928 {
 929         int ret = -EINVAL;
 930
 931         if (!pwrdm)
 932                 return ret;
 933
 934         if (!(pwrdm->flags & PWRDM_HAS_HDWR_SAR))
 935                 return ret;
 936
 937         pr_debug("powerdomain: %s: clearing SAVEANDRESTORE bit\n", pwrdm->name);
 938
 939         if (arch_pwrdm && arch_pwrdm->pwrdm_disable_hdwr_sar)
 940                 ret = arch_pwrdm->pwrdm_disable_hdwr_sar(pwrdm);
 941
 942         return ret;
 943 }
 944
 945 /**
 946  * pwrdm_has_hdwr_sar - test whether powerdomain supports hardware SAR
 947  * @pwrdm: struct powerdomain *
 948  *
 949  * Returns 1 if powerdomain @pwrdm supports hardware save-and-restore
 950  * for some devices, or 0 if it does not.
 951  */
 952 bool pwrdm_has_hdwr_sar(struct powerdomain *pwrdm)
 953 {
 954         return (pwrdm && pwrdm->flags & PWRDM_HAS_HDWR_SAR) ? 1 : 0;
 955 }
 956
 957 int pwrdm_state_switch_nolock(struct powerdomain *pwrdm)
 958 {
 959         int ret;
 960
 961         if (!pwrdm || !arch_pwrdm)
 962                 return -EINVAL;
 963
 964         ret = arch_pwrdm->pwrdm_wait_transition(pwrdm);
 965         if (!ret)
 966                 ret = _pwrdm_state_switch(pwrdm, PWRDM_STATE_NOW);
 967
 968         return ret;
 969 }
 970
 971 int __deprecated pwrdm_state_switch(struct powerdomain *pwrdm)
 972 {
 973         int ret;
 974
 975         pwrdm_lock(pwrdm);
 976         ret = pwrdm_state_switch_nolock(pwrdm);
 977         pwrdm_unlock(pwrdm);
 978
 979         return ret;
 980 }
 981
 982 int pwrdm_pre_transition(struct powerdomain *pwrdm)
 983 {
 984         if (pwrdm)
 985                 _pwrdm_pre_transition_cb(pwrdm, NULL);
 986         else
 987                 pwrdm_for_each(_pwrdm_pre_transition_cb, NULL);
 988
 989         return 0;
 990 }
 991
 992 int pwrdm_post_transition(struct powerdomain *pwrdm)
 993 {
 994         if (pwrdm)
 995                 _pwrdm_post_transition_cb(pwrdm, NULL);
 996         else
 997                 pwrdm_for_each(_pwrdm_post_transition_cb, NULL);
 998
 999         return 0;
1000 }
1001
1002 /**
1003  * pwrdm_get_valid_lp_state() - Find best match deep power state
1004  * @pwrdm:      power domain for which we want to find best match
1005  * @is_logic_state: Are we looking for logic state match here? Should
1006  *                  be one of PWRDM_xxx macro values
1007  * @req_state:  requested power state
1008  *
1009  * Returns: closest match for requested power state. default fallback
1010  * is RET for logic state and ON for power state.
1011  *
1012  * This does a search from the power domain data looking for the
1013  * closest valid power domain state that the hardware can achieve.
1014  * PRCM definitions for PWRSTCTRL allows us to program whatever
1015  * configuration we'd like, and PRCM will actually attempt such
1016  * a transition, however if the powerdomain does not actually support it,
1017  * we endup with a hung system. The valid power domain states are already
1018  * available in our powerdomain data files. So this function tries to do
1019  * the following:
1020  * a) find if we have an exact match to the request - no issues.
1021  * b) else find if a deeper power state is possible.
1022  * c) failing which, it tries to find closest higher power state for the
1023  * request.
1024  */
1025 u8 pwrdm_get_valid_lp_state(struct powerdomain *pwrdm,
1026                             bool is_logic_state, u8 req_state)
1027 {
1028         u8 pwrdm_states = is_logic_state ? pwrdm->pwrsts_logic_ret :
1029                         pwrdm->pwrsts;
1030         /* For logic, ret is highest and others, ON is highest */
1031         u8 default_pwrst = is_logic_state ? PWRDM_POWER_RET : PWRDM_POWER_ON;
1032         u8 new_pwrst;
1033         bool found;
1034
1035         /* If it is already supported, nothing to search */
1036         if (pwrdm_states & BIT(req_state))
1037                 return req_state;
1038
1039         if (!req_state)
1040                 goto up_search;
1041
1042         /*
1043          * So, we dont have a exact match
1044          * Can we get a deeper power state match?
1045          */
1046         new_pwrst = req_state - 1;
1047         found = true;
1048         while (!(pwrdm_states & BIT(new_pwrst))) {
1049                 /* No match even at OFF? Not available */
1050                 if (new_pwrst == PWRDM_POWER_OFF) {
1051                         found = false;
1052                         break;
1053                 }
1054                 new_pwrst--;
1055         }
1056
1057         if (found)
1058                 goto done;
1059
1060 up_search:
1061         /* OK, no deeper ones, can we get a higher match? */
1062         new_pwrst = req_state + 1;
1063         while (!(pwrdm_states & BIT(new_pwrst))) {
1064                 if (new_pwrst > PWRDM_POWER_ON) {
1065                         WARN(1, "powerdomain: %s: Fix max powerstate to ON\n",
1066                              pwrdm->name);
1067                         return PWRDM_POWER_ON;
1068                 }
1069
1070                 if (new_pwrst == default_pwrst)
1071                         break;
1072                 new_pwrst++;
1073         }
1074 done:
1075         return new_pwrst;
1076 }
1077
1078 /**
1079  * omap_set_pwrdm_state - change a powerdomain's current power state
1080  * @pwrdm: struct powerdomain * to change the power state of
1081  * @pwrst: power state to change to
1082  *
1083  * Change the current hardware power state of the powerdomain
1084  * represented by @pwrdm to the power state represented by @pwrst.
1085  * Returns -EINVAL if @pwrdm is null or invalid or if the
1086  * powerdomain's current power state could not be read, or returns 0
1087  * upon success or if @pwrdm does not support @pwrst or any
1088  * lower-power state.  XXX Should not return 0 if the @pwrdm does not
1089  * support @pwrst or any lower-power state: this should be an error.
1090  */
1091 int omap_set_pwrdm_state(struct powerdomain *pwrdm, u8 pwrst)
1092 {
1093         u8 next_pwrst, sleep_switch;
1094         int curr_pwrst;
1095         int ret = 0;
1096         bool hwsup = false;
1097
1098         if (!pwrdm || IS_ERR(pwrdm))
1099                 return -EINVAL;
1100
1101         while (!(pwrdm->pwrsts & (1 << pwrst))) {
1102                 if (pwrst == PWRDM_POWER_OFF)
1103                         return ret;
1104                 pwrst--;
1105         }
1106
1107         pwrdm_lock(pwrdm);
1108
1109         curr_pwrst = pwrdm_read_pwrst(pwrdm);
1110         if (curr_pwrst < 0) {
1111                 ret = -EINVAL;
1112                 goto osps_out;
1113         }
1114
1115         next_pwrst = pwrdm_read_next_pwrst(pwrdm);
1116         if (curr_pwrst == pwrst && next_pwrst == pwrst)
1117                 goto osps_out;
1118
1119         sleep_switch = _pwrdm_save_clkdm_state_and_activate(pwrdm, curr_pwrst,
1120                                                             pwrst, &hwsup);
1121
1122         ret = pwrdm_set_next_pwrst(pwrdm, pwrst);
1123         if (ret)
1124                 pr_err("%s: unable to set power state of powerdomain: %s\n",
1125                        __func__, pwrdm->name);
1126
1127         _pwrdm_restore_clkdm_state(pwrdm, sleep_switch, hwsup);
1128
1129 osps_out:
1130         pwrdm_unlock(pwrdm);
1131
1132         return ret;
1133 }
1134
1135 /**
1136  * pwrdm_get_context_loss_count - get powerdomain's context loss count
1137  * @pwrdm: struct powerdomain * to wait for
1138  *
1139  * Context loss count is the sum of powerdomain off-mode counter, the
1140  * logic off counter and the per-bank memory off counter.  Returns negative
1141  * (and WARNs) upon error, otherwise, returns the context loss count.
1142  */
1143 int pwrdm_get_context_loss_count(struct powerdomain *pwrdm)
1144 {
1145         int i, count;
1146
1147         if (!pwrdm) {
1148                 WARN(1, "powerdomain: %s: pwrdm is null\n", __func__);
1149                 return -ENODEV;
1150         }
1151
1152         count = pwrdm->state_counter[PWRDM_POWER_OFF];
1153         count += pwrdm->ret_logic_off_counter;
1154
1155         for (i = 0; i < pwrdm->banks; i++)
1156                 count += pwrdm->ret_mem_off_counter[i];
1157
1158         /*
1159          * Context loss count has to be a non-negative value. Clear the sign
1160          * bit to get a value range from 0 to INT_MAX.
1161          */
1162         count &= INT_MAX;
1163
1164         pr_debug("powerdomain: %s: context loss count = %d\n",
1165                  pwrdm->name, count);
1166
1167         return count;
1168 }
1169
1170 /**
1171  * pwrdm_can_ever_lose_context - can this powerdomain ever lose context?
1172  * @pwrdm: struct powerdomain *
1173  *
1174  * Given a struct powerdomain * @pwrdm, returns 1 if the powerdomain
1175  * can lose either memory or logic context or if @pwrdm is invalid, or
1176  * returns 0 otherwise.  This function is not concerned with how the
1177  * powerdomain registers are programmed (i.e., to go off or not); it's
1178  * concerned with whether it's ever possible for this powerdomain to
1179  * go off while some other part of the chip is active.  This function
1180  * assumes that every powerdomain can go to either ON or INACTIVE.
1181  */
1182 bool pwrdm_can_ever_lose_context(struct powerdomain *pwrdm)
1183 {
1184         int i;
1185
1186         if (!pwrdm) {
1187                 pr_debug("powerdomain: %s: invalid powerdomain pointer\n",
1188                          __func__);
1189                 return 1;
1190         }
1191
1192         if (pwrdm->pwrsts & PWRSTS_OFF)
1193                 return 1;
1194
1195         if (pwrdm->pwrsts & PWRSTS_RET) {
1196                 if (pwrdm->pwrsts_logic_ret & PWRSTS_OFF)
1197                         return 1;
1198
1199                 for (i = 0; i < pwrdm->banks; i++)
1200                         if (pwrdm->pwrsts_mem_ret[i] & PWRSTS_OFF)
1201                                 return 1;
1202         }
1203
1204         for (i = 0; i < pwrdm->banks; i++)
1205                 if (pwrdm->pwrsts_mem_on[i] & PWRSTS_OFF)
1206                         return 1;
1207
1208         return 0;
1209 }