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 <trace/events/power.h> 23 24 #include "cm2xxx_3xxx.h" 25 #include "prcm44xx.h" 26 #include "cm44xx.h" 27 #include "prm2xxx_3xxx.h" 28 #include "prm44xx.h" 29 30 #include <asm/cpu.h> 31 32 #include <plat/prcm.h> 33 34 #include "powerdomain.h" 35 #include "clockdomain.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 /* pwrdm_list contains all registered struct powerdomains */ 49 static LIST_HEAD(pwrdm_list); 50 51 static struct pwrdm_ops *arch_pwrdm; 52 53 /* Private functions */ 54 55 static struct powerdomain *_pwrdm_lookup(const char *name) 56 { 57 struct powerdomain *pwrdm, *temp_pwrdm; 58 59 pwrdm = NULL; 60 61 list_for_each_entry(temp_pwrdm, &pwrdm_list, node) { 62 if (!strcmp(name, temp_pwrdm->name)) { 63 pwrdm = temp_pwrdm; 64 break; 65 } 66 } 67 68 return pwrdm; 69 } 70 71 /** 72 * _pwrdm_register - register a powerdomain 73 * @pwrdm: struct powerdomain * to register 74 * 75 * Adds a powerdomain to the internal powerdomain list. Returns 76 * -EINVAL if given a null pointer, -EEXIST if a powerdomain is 77 * already registered by the provided name, or 0 upon success. 78 */ 79 static int _pwrdm_register(struct powerdomain *pwrdm) 80 { 81 int i; 82 struct voltagedomain *voltdm; 83 84 if (!pwrdm || !pwrdm->name) 85 return -EINVAL; 86 87 if (cpu_is_omap44xx() && 88 pwrdm->prcm_partition == OMAP4430_INVALID_PRCM_PARTITION) { 89 pr_err("powerdomain: %s: missing OMAP4 PRCM partition ID\n", 90 pwrdm->name); 91 return -EINVAL; 92 } 93 94 if (_pwrdm_lookup(pwrdm->name)) 95 return -EEXIST; 96 97 voltdm = voltdm_lookup(pwrdm->voltdm.name); 98 if (!voltdm) { 99 pr_err("powerdomain: %s: voltagedomain %s does not exist\n", 100 pwrdm->name, pwrdm->voltdm.name); 101 return -EINVAL; 102 } 103 pwrdm->voltdm.ptr = voltdm; 104 INIT_LIST_HEAD(&pwrdm->voltdm_node); 105 voltdm_add_pwrdm(voltdm, pwrdm); 106 107 list_add(&pwrdm->node, &pwrdm_list); 108 109 /* Initialize the powerdomain's state counter */ 110 for (i = 0; i < PWRDM_MAX_PWRSTS; i++) 111 pwrdm->state_counter[i] = 0; 112 113 pwrdm->ret_logic_off_counter = 0; 114 for (i = 0; i < pwrdm->banks; i++) 115 pwrdm->ret_mem_off_counter[i] = 0; 116 117 pwrdm_wait_transition(pwrdm); 118 pwrdm->state = pwrdm_read_pwrst(pwrdm); 119 pwrdm->state_counter[pwrdm->state] = 1; 120 121 pr_debug("powerdomain: registered %s\n", pwrdm->name); 122 123 return 0; 124 } 125 126 static void _update_logic_membank_counters(struct powerdomain *pwrdm) 127 { 128 int i; 129 u8 prev_logic_pwrst, prev_mem_pwrst; 130 131 prev_logic_pwrst = pwrdm_read_prev_logic_pwrst(pwrdm); 132 if ((pwrdm->pwrsts_logic_ret == PWRSTS_OFF_RET) && 133 (prev_logic_pwrst == PWRDM_POWER_OFF)) 134 pwrdm->ret_logic_off_counter++; 135 136 for (i = 0; i < pwrdm->banks; i++) { 137 prev_mem_pwrst = pwrdm_read_prev_mem_pwrst(pwrdm, i); 138 139 if ((pwrdm->pwrsts_mem_ret[i] == PWRSTS_OFF_RET) && 140 (prev_mem_pwrst == PWRDM_POWER_OFF)) 141 pwrdm->ret_mem_off_counter[i]++; 142 } 143 } 144 145 static int _pwrdm_state_switch(struct powerdomain *pwrdm, int flag) 146 { 147 148 int prev, state, trace_state = 0; 149 150 if (pwrdm == NULL) 151 return -EINVAL; 152 153 state = pwrdm_read_pwrst(pwrdm); 154 155 switch (flag) { 156 case PWRDM_STATE_NOW: 157 prev = pwrdm->state; 158 break; 159 case PWRDM_STATE_PREV: 160 prev = pwrdm_read_prev_pwrst(pwrdm); 161 if (pwrdm->state != prev) 162 pwrdm->state_counter[prev]++; 163 if (prev == PWRDM_POWER_RET) 164 _update_logic_membank_counters(pwrdm); 165 /* 166 * If the power domain did not hit the desired state, 167 * generate a trace event with both the desired and hit states 168 */ 169 if (state != prev) { 170 trace_state = (PWRDM_TRACE_STATES_FLAG | 171 ((state & OMAP_POWERSTATE_MASK) << 8) | 172 ((prev & OMAP_POWERSTATE_MASK) << 0)); 173 trace_power_domain_target(pwrdm->name, trace_state, 174 smp_processor_id()); 175 } 176 break; 177 default: 178 return -EINVAL; 179 } 180 181 if (state != prev) 182 pwrdm->state_counter[state]++; 183 184 pm_dbg_update_time(pwrdm, prev); 185 186 pwrdm->state = state; 187 188 return 0; 189 } 190 191 static int _pwrdm_pre_transition_cb(struct powerdomain *pwrdm, void *unused) 192 { 193 pwrdm_clear_all_prev_pwrst(pwrdm); 194 _pwrdm_state_switch(pwrdm, PWRDM_STATE_NOW); 195 return 0; 196 } 197 198 static int _pwrdm_post_transition_cb(struct powerdomain *pwrdm, void *unused) 199 { 200 _pwrdm_state_switch(pwrdm, PWRDM_STATE_PREV); 201 return 0; 202 } 203 204 /* Public functions */ 205 206 /** 207 * pwrdm_register_platform_funcs - register powerdomain implementation fns 208 * @po: func pointers for arch specific implementations 209 * 210 * Register the list of function pointers used to implement the 211 * powerdomain functions on different OMAP SoCs. Should be called 212 * before any other pwrdm_register*() function. Returns -EINVAL if 213 * @po is null, -EEXIST if platform functions have already been 214 * registered, or 0 upon success. 215 */ 216 int pwrdm_register_platform_funcs(struct pwrdm_ops *po) 217 { 218 if (!po) 219 return -EINVAL; 220 221 if (arch_pwrdm) 222 return -EEXIST; 223 224 arch_pwrdm = po; 225 226 return 0; 227 } 228 229 /** 230 * pwrdm_register_pwrdms - register SoC powerdomains 231 * @ps: pointer to an array of struct powerdomain to register 232 * 233 * Register the powerdomains available on a particular OMAP SoC. Must 234 * be called after pwrdm_register_platform_funcs(). May be called 235 * multiple times. Returns -EACCES if called before 236 * pwrdm_register_platform_funcs(); -EINVAL if the argument @ps is 237 * null; or 0 upon success. 238 */ 239 int pwrdm_register_pwrdms(struct powerdomain **ps) 240 { 241 struct powerdomain **p = NULL; 242 243 if (!arch_pwrdm) 244 return -EEXIST; 245 246 if (!ps) 247 return -EINVAL; 248 249 for (p = ps; *p; p++) 250 _pwrdm_register(*p); 251 252 return 0; 253 } 254 255 /** 256 * pwrdm_complete_init - set up the powerdomain layer 257 * 258 * Do whatever is necessary to initialize registered powerdomains and 259 * powerdomain code. Currently, this programs the next power state 260 * for each powerdomain to ON. This prevents powerdomains from 261 * unexpectedly losing context or entering high wakeup latency modes 262 * with non-power-management-enabled kernels. Must be called after 263 * pwrdm_register_pwrdms(). Returns -EACCES if called before 264 * pwrdm_register_pwrdms(), or 0 upon success. 265 */ 266 int pwrdm_complete_init(void) 267 { 268 struct powerdomain *temp_p; 269 270 if (list_empty(&pwrdm_list)) 271 return -EACCES; 272 273 list_for_each_entry(temp_p, &pwrdm_list, node) 274 pwrdm_set_next_pwrst(temp_p, PWRDM_POWER_ON); 275 276 return 0; 277 } 278 279 /** 280 * pwrdm_lookup - look up a powerdomain by name, return a pointer 281 * @name: name of powerdomain 282 * 283 * Find a registered powerdomain by its name @name. Returns a pointer 284 * to the struct powerdomain if found, or NULL otherwise. 285 */ 286 struct powerdomain *pwrdm_lookup(const char *name) 287 { 288 struct powerdomain *pwrdm; 289 290 if (!name) 291 return NULL; 292 293 pwrdm = _pwrdm_lookup(name); 294 295 return pwrdm; 296 } 297 298 /** 299 * pwrdm_for_each - call function on each registered clockdomain 300 * @fn: callback function * 301 * 302 * Call the supplied function @fn for each registered powerdomain. 303 * The callback function @fn can return anything but 0 to bail out 304 * early from the iterator. Returns the last return value of the 305 * callback function, which should be 0 for success or anything else 306 * to indicate failure; or -EINVAL if the function pointer is null. 307 */ 308 int pwrdm_for_each(int (*fn)(struct powerdomain *pwrdm, void *user), 309 void *user) 310 { 311 struct powerdomain *temp_pwrdm; 312 int ret = 0; 313 314 if (!fn) 315 return -EINVAL; 316 317 list_for_each_entry(temp_pwrdm, &pwrdm_list, node) { 318 ret = (*fn)(temp_pwrdm, user); 319 if (ret) 320 break; 321 } 322 323 return ret; 324 } 325 326 /** 327 * pwrdm_add_clkdm - add a clockdomain to a powerdomain 328 * @pwrdm: struct powerdomain * to add the clockdomain to 329 * @clkdm: struct clockdomain * to associate with a powerdomain 330 * 331 * Associate the clockdomain @clkdm with a powerdomain @pwrdm. This 332 * enables the use of pwrdm_for_each_clkdm(). Returns -EINVAL if 333 * presented with invalid pointers; -ENOMEM if memory could not be allocated; 334 * or 0 upon success. 335 */ 336 int pwrdm_add_clkdm(struct powerdomain *pwrdm, struct clockdomain *clkdm) 337 { 338 int i; 339 int ret = -EINVAL; 340 341 if (!pwrdm || !clkdm) 342 return -EINVAL; 343 344 pr_debug("powerdomain: %s: associating clockdomain %s\n", 345 pwrdm->name, clkdm->name); 346 347 for (i = 0; i < PWRDM_MAX_CLKDMS; i++) { 348 if (!pwrdm->pwrdm_clkdms[i]) 349 break; 350 #ifdef DEBUG 351 if (pwrdm->pwrdm_clkdms[i] == clkdm) { 352 ret = -EINVAL; 353 goto pac_exit; 354 } 355 #endif 356 } 357 358 if (i == PWRDM_MAX_CLKDMS) { 359 pr_debug("powerdomain: %s: increase PWRDM_MAX_CLKDMS for clkdm %s\n", 360 pwrdm->name, clkdm->name); 361 WARN_ON(1); 362 ret = -ENOMEM; 363 goto pac_exit; 364 } 365 366 pwrdm->pwrdm_clkdms[i] = clkdm; 367 368 ret = 0; 369 370 pac_exit: 371 return ret; 372 } 373 374 /** 375 * pwrdm_del_clkdm - remove a clockdomain from a powerdomain 376 * @pwrdm: struct powerdomain * to add the clockdomain to 377 * @clkdm: struct clockdomain * to associate with a powerdomain 378 * 379 * Dissociate the clockdomain @clkdm from the powerdomain 380 * @pwrdm. Returns -EINVAL if presented with invalid pointers; -ENOENT 381 * if @clkdm was not associated with the powerdomain, or 0 upon 382 * success. 383 */ 384 int pwrdm_del_clkdm(struct powerdomain *pwrdm, struct clockdomain *clkdm) 385 { 386 int ret = -EINVAL; 387 int i; 388 389 if (!pwrdm || !clkdm) 390 return -EINVAL; 391 392 pr_debug("powerdomain: %s: dissociating clockdomain %s\n", 393 pwrdm->name, clkdm->name); 394 395 for (i = 0; i < PWRDM_MAX_CLKDMS; i++) 396 if (pwrdm->pwrdm_clkdms[i] == clkdm) 397 break; 398 399 if (i == PWRDM_MAX_CLKDMS) { 400 pr_debug("powerdomain: %s: clkdm %s not associated?!\n", 401 pwrdm->name, clkdm->name); 402 ret = -ENOENT; 403 goto pdc_exit; 404 } 405 406 pwrdm->pwrdm_clkdms[i] = NULL; 407 408 ret = 0; 409 410 pdc_exit: 411 return ret; 412 } 413 414 /** 415 * pwrdm_for_each_clkdm - call function on each clkdm in a pwrdm 416 * @pwrdm: struct powerdomain * to iterate over 417 * @fn: callback function * 418 * 419 * Call the supplied function @fn for each clockdomain in the powerdomain 420 * @pwrdm. The callback function can return anything but 0 to bail 421 * out early from the iterator. Returns -EINVAL if presented with 422 * invalid pointers; or passes along the last return value of the 423 * callback function, which should be 0 for success or anything else 424 * to indicate failure. 425 */ 426 int pwrdm_for_each_clkdm(struct powerdomain *pwrdm, 427 int (*fn)(struct powerdomain *pwrdm, 428 struct clockdomain *clkdm)) 429 { 430 int ret = 0; 431 int i; 432 433 if (!fn) 434 return -EINVAL; 435 436 for (i = 0; i < PWRDM_MAX_CLKDMS && !ret; i++) 437 ret = (*fn)(pwrdm, pwrdm->pwrdm_clkdms[i]); 438 439 return ret; 440 } 441 442 /** 443 * pwrdm_get_voltdm - return a ptr to the voltdm that this pwrdm resides in 444 * @pwrdm: struct powerdomain * 445 * 446 * Return a pointer to the struct voltageomain that the specified powerdomain 447 * @pwrdm exists in. 448 */ 449 struct voltagedomain *pwrdm_get_voltdm(struct powerdomain *pwrdm) 450 { 451 return pwrdm->voltdm.ptr; 452 } 453 454 /** 455 * pwrdm_get_mem_bank_count - get number of memory banks in this powerdomain 456 * @pwrdm: struct powerdomain * 457 * 458 * Return the number of controllable memory banks in powerdomain @pwrdm, 459 * starting with 1. Returns -EINVAL if the powerdomain pointer is null. 460 */ 461 int pwrdm_get_mem_bank_count(struct powerdomain *pwrdm) 462 { 463 if (!pwrdm) 464 return -EINVAL; 465 466 return pwrdm->banks; 467 } 468 469 /** 470 * pwrdm_set_next_pwrst - set next powerdomain power state 471 * @pwrdm: struct powerdomain * to set 472 * @pwrst: one of the PWRDM_POWER_* macros 473 * 474 * Set the powerdomain @pwrdm's next power state to @pwrst. The powerdomain 475 * may not enter this state immediately if the preconditions for this state 476 * have not been satisfied. Returns -EINVAL if the powerdomain pointer is 477 * null or if the power state is invalid for the powerdomin, or returns 0 478 * upon success. 479 */ 480 int pwrdm_set_next_pwrst(struct powerdomain *pwrdm, u8 pwrst) 481 { 482 int ret = -EINVAL; 483 484 if (!pwrdm) 485 return -EINVAL; 486 487 if (!(pwrdm->pwrsts & (1 << pwrst))) 488 return -EINVAL; 489 490 pr_debug("powerdomain: %s: setting next powerstate to %0x\n", 491 pwrdm->name, pwrst); 492 493 if (arch_pwrdm && arch_pwrdm->pwrdm_set_next_pwrst) { 494 /* Trace the pwrdm desired target state */ 495 trace_power_domain_target(pwrdm->name, pwrst, 496 smp_processor_id()); 497 /* Program the pwrdm desired target state */ 498 ret = arch_pwrdm->pwrdm_set_next_pwrst(pwrdm, pwrst); 499 } 500 501 return ret; 502 } 503 504 /** 505 * pwrdm_read_next_pwrst - get next powerdomain power state 506 * @pwrdm: struct powerdomain * to get power state 507 * 508 * Return the powerdomain @pwrdm's next power state. Returns -EINVAL 509 * if the powerdomain pointer is null or returns the next power state 510 * upon success. 511 */ 512 int pwrdm_read_next_pwrst(struct powerdomain *pwrdm) 513 { 514 int ret = -EINVAL; 515 516 if (!pwrdm) 517 return -EINVAL; 518 519 if (arch_pwrdm && arch_pwrdm->pwrdm_read_next_pwrst) 520 ret = arch_pwrdm->pwrdm_read_next_pwrst(pwrdm); 521 522 return ret; 523 } 524 525 /** 526 * pwrdm_read_pwrst - get current powerdomain power state 527 * @pwrdm: struct powerdomain * to get power state 528 * 529 * Return the powerdomain @pwrdm's current power state. Returns -EINVAL 530 * if the powerdomain pointer is null or returns the current power state 531 * upon success. Note that if the power domain only supports the ON state 532 * then just return ON as the current state. 533 */ 534 int pwrdm_read_pwrst(struct powerdomain *pwrdm) 535 { 536 int ret = -EINVAL; 537 538 if (!pwrdm) 539 return -EINVAL; 540 541 if (pwrdm->pwrsts == PWRSTS_ON) 542 return PWRDM_POWER_ON; 543 544 if (arch_pwrdm && arch_pwrdm->pwrdm_read_pwrst) 545 ret = arch_pwrdm->pwrdm_read_pwrst(pwrdm); 546 547 return ret; 548 } 549 550 /** 551 * pwrdm_read_prev_pwrst - get previous powerdomain power state 552 * @pwrdm: struct powerdomain * to get previous power state 553 * 554 * Return the powerdomain @pwrdm's previous power state. Returns -EINVAL 555 * if the powerdomain pointer is null or returns the previous power state 556 * upon success. 557 */ 558 int pwrdm_read_prev_pwrst(struct powerdomain *pwrdm) 559 { 560 int ret = -EINVAL; 561 562 if (!pwrdm) 563 return -EINVAL; 564 565 if (arch_pwrdm && arch_pwrdm->pwrdm_read_prev_pwrst) 566 ret = arch_pwrdm->pwrdm_read_prev_pwrst(pwrdm); 567 568 return ret; 569 } 570 571 /** 572 * pwrdm_set_logic_retst - set powerdomain logic power state upon retention 573 * @pwrdm: struct powerdomain * to set 574 * @pwrst: one of the PWRDM_POWER_* macros 575 * 576 * Set the next power state @pwrst that the logic portion of the 577 * powerdomain @pwrdm will enter when the powerdomain enters retention. 578 * This will be either RETENTION or OFF, if supported. Returns 579 * -EINVAL if the powerdomain pointer is null or the target power 580 * state is not not supported, or returns 0 upon success. 581 */ 582 int pwrdm_set_logic_retst(struct powerdomain *pwrdm, u8 pwrst) 583 { 584 int ret = -EINVAL; 585 586 if (!pwrdm) 587 return -EINVAL; 588 589 if (!(pwrdm->pwrsts_logic_ret & (1 << pwrst))) 590 return -EINVAL; 591 592 pr_debug("powerdomain: %s: setting next logic powerstate to %0x\n", 593 pwrdm->name, pwrst); 594 595 if (arch_pwrdm && arch_pwrdm->pwrdm_set_logic_retst) 596 ret = arch_pwrdm->pwrdm_set_logic_retst(pwrdm, pwrst); 597 598 return ret; 599 } 600 601 /** 602 * pwrdm_set_mem_onst - set memory power state while powerdomain ON 603 * @pwrdm: struct powerdomain * to set 604 * @bank: memory bank number to set (0-3) 605 * @pwrst: one of the PWRDM_POWER_* macros 606 * 607 * Set the next power state @pwrst that memory bank @bank of the 608 * powerdomain @pwrdm will enter when the powerdomain enters the ON 609 * state. @bank will be a number from 0 to 3, and represents different 610 * types of memory, depending on the powerdomain. Returns -EINVAL if 611 * the powerdomain pointer is null or the target power state is not 612 * not supported for this memory bank, -EEXIST if the target memory 613 * bank does not exist or is not controllable, or returns 0 upon 614 * success. 615 */ 616 int pwrdm_set_mem_onst(struct powerdomain *pwrdm, u8 bank, u8 pwrst) 617 { 618 int ret = -EINVAL; 619 620 if (!pwrdm) 621 return -EINVAL; 622 623 if (pwrdm->banks < (bank + 1)) 624 return -EEXIST; 625 626 if (!(pwrdm->pwrsts_mem_on[bank] & (1 << pwrst))) 627 return -EINVAL; 628 629 pr_debug("powerdomain: %s: setting next memory powerstate for bank %0x while pwrdm-ON to %0x\n", 630 pwrdm->name, bank, pwrst); 631 632 if (arch_pwrdm && arch_pwrdm->pwrdm_set_mem_onst) 633 ret = arch_pwrdm->pwrdm_set_mem_onst(pwrdm, bank, pwrst); 634 635 return ret; 636 } 637 638 /** 639 * pwrdm_set_mem_retst - set memory power state while powerdomain in RET 640 * @pwrdm: struct powerdomain * to set 641 * @bank: memory bank number to set (0-3) 642 * @pwrst: one of the PWRDM_POWER_* macros 643 * 644 * Set the next power state @pwrst that memory bank @bank of the 645 * powerdomain @pwrdm will enter when the powerdomain enters the 646 * RETENTION state. Bank will be a number from 0 to 3, and represents 647 * different types of memory, depending on the powerdomain. @pwrst 648 * will be either RETENTION or OFF, if supported. Returns -EINVAL if 649 * the powerdomain pointer is null or the target power state is not 650 * not supported for this memory bank, -EEXIST if the target memory 651 * bank does not exist or is not controllable, or returns 0 upon 652 * success. 653 */ 654 int pwrdm_set_mem_retst(struct powerdomain *pwrdm, u8 bank, u8 pwrst) 655 { 656 int ret = -EINVAL; 657 658 if (!pwrdm) 659 return -EINVAL; 660 661 if (pwrdm->banks < (bank + 1)) 662 return -EEXIST; 663 664 if (!(pwrdm->pwrsts_mem_ret[bank] & (1 << pwrst))) 665 return -EINVAL; 666 667 pr_debug("powerdomain: %s: setting next memory powerstate for bank %0x while pwrdm-RET to %0x\n", 668 pwrdm->name, bank, pwrst); 669 670 if (arch_pwrdm && arch_pwrdm->pwrdm_set_mem_retst) 671 ret = arch_pwrdm->pwrdm_set_mem_retst(pwrdm, bank, pwrst); 672 673 return ret; 674 } 675 676 /** 677 * pwrdm_read_logic_pwrst - get current powerdomain logic retention power state 678 * @pwrdm: struct powerdomain * to get current logic retention power state 679 * 680 * Return the power state that the logic portion of powerdomain @pwrdm 681 * will enter when the powerdomain enters retention. Returns -EINVAL 682 * if the powerdomain pointer is null or returns the logic retention 683 * power state upon success. 684 */ 685 int pwrdm_read_logic_pwrst(struct powerdomain *pwrdm) 686 { 687 int ret = -EINVAL; 688 689 if (!pwrdm) 690 return -EINVAL; 691 692 if (arch_pwrdm && arch_pwrdm->pwrdm_read_logic_pwrst) 693 ret = arch_pwrdm->pwrdm_read_logic_pwrst(pwrdm); 694 695 return ret; 696 } 697 698 /** 699 * pwrdm_read_prev_logic_pwrst - get previous powerdomain logic power state 700 * @pwrdm: struct powerdomain * to get previous logic power state 701 * 702 * Return the powerdomain @pwrdm's previous logic power state. Returns 703 * -EINVAL if the powerdomain pointer is null or returns the previous 704 * logic power state upon success. 705 */ 706 int pwrdm_read_prev_logic_pwrst(struct powerdomain *pwrdm) 707 { 708 int ret = -EINVAL; 709 710 if (!pwrdm) 711 return -EINVAL; 712 713 if (arch_pwrdm && arch_pwrdm->pwrdm_read_prev_logic_pwrst) 714 ret = arch_pwrdm->pwrdm_read_prev_logic_pwrst(pwrdm); 715 716 return ret; 717 } 718 719 /** 720 * pwrdm_read_logic_retst - get next powerdomain logic power state 721 * @pwrdm: struct powerdomain * to get next logic power state 722 * 723 * Return the powerdomain pwrdm's logic power state. Returns -EINVAL 724 * if the powerdomain pointer is null or returns the next logic 725 * power state upon success. 726 */ 727 int pwrdm_read_logic_retst(struct powerdomain *pwrdm) 728 { 729 int ret = -EINVAL; 730 731 if (!pwrdm) 732 return -EINVAL; 733 734 if (arch_pwrdm && arch_pwrdm->pwrdm_read_logic_retst) 735 ret = arch_pwrdm->pwrdm_read_logic_retst(pwrdm); 736 737 return ret; 738 } 739 740 /** 741 * pwrdm_read_mem_pwrst - get current memory bank power state 742 * @pwrdm: struct powerdomain * to get current memory bank power state 743 * @bank: memory bank number (0-3) 744 * 745 * Return the powerdomain @pwrdm's current memory power state for bank 746 * @bank. Returns -EINVAL if the powerdomain pointer is null, -EEXIST if 747 * the target memory bank does not exist or is not controllable, or 748 * returns the current memory power state upon success. 749 */ 750 int pwrdm_read_mem_pwrst(struct powerdomain *pwrdm, u8 bank) 751 { 752 int ret = -EINVAL; 753 754 if (!pwrdm) 755 return ret; 756 757 if (pwrdm->banks < (bank + 1)) 758 return ret; 759 760 if (pwrdm->flags & PWRDM_HAS_MPU_QUIRK) 761 bank = 1; 762 763 if (arch_pwrdm && arch_pwrdm->pwrdm_read_mem_pwrst) 764 ret = arch_pwrdm->pwrdm_read_mem_pwrst(pwrdm, bank); 765 766 return ret; 767 } 768 769 /** 770 * pwrdm_read_prev_mem_pwrst - get previous memory bank power state 771 * @pwrdm: struct powerdomain * to get previous memory bank power state 772 * @bank: memory bank number (0-3) 773 * 774 * Return the powerdomain @pwrdm's previous memory power state for 775 * bank @bank. Returns -EINVAL if the powerdomain pointer is null, 776 * -EEXIST if the target memory bank does not exist or is not 777 * controllable, or returns the previous memory power state upon 778 * success. 779 */ 780 int pwrdm_read_prev_mem_pwrst(struct powerdomain *pwrdm, u8 bank) 781 { 782 int ret = -EINVAL; 783 784 if (!pwrdm) 785 return ret; 786 787 if (pwrdm->banks < (bank + 1)) 788 return ret; 789 790 if (pwrdm->flags & PWRDM_HAS_MPU_QUIRK) 791 bank = 1; 792 793 if (arch_pwrdm && arch_pwrdm->pwrdm_read_prev_mem_pwrst) 794 ret = arch_pwrdm->pwrdm_read_prev_mem_pwrst(pwrdm, bank); 795 796 return ret; 797 } 798 799 /** 800 * pwrdm_read_mem_retst - get next memory bank power state 801 * @pwrdm: struct powerdomain * to get mext memory bank power state 802 * @bank: memory bank number (0-3) 803 * 804 * Return the powerdomain pwrdm's next memory power state for bank 805 * x. Returns -EINVAL if the powerdomain pointer is null, -EEXIST if 806 * the target memory bank does not exist or is not controllable, or 807 * returns the next memory power state upon success. 808 */ 809 int pwrdm_read_mem_retst(struct powerdomain *pwrdm, u8 bank) 810 { 811 int ret = -EINVAL; 812 813 if (!pwrdm) 814 return ret; 815 816 if (pwrdm->banks < (bank + 1)) 817 return ret; 818 819 if (arch_pwrdm && arch_pwrdm->pwrdm_read_mem_retst) 820 ret = arch_pwrdm->pwrdm_read_mem_retst(pwrdm, bank); 821 822 return ret; 823 } 824 825 /** 826 * pwrdm_clear_all_prev_pwrst - clear previous powerstate register for a pwrdm 827 * @pwrdm: struct powerdomain * to clear 828 * 829 * Clear the powerdomain's previous power state register @pwrdm. 830 * Clears the entire register, including logic and memory bank 831 * previous power states. Returns -EINVAL if the powerdomain pointer 832 * is null, or returns 0 upon success. 833 */ 834 int pwrdm_clear_all_prev_pwrst(struct powerdomain *pwrdm) 835 { 836 int ret = -EINVAL; 837 838 if (!pwrdm) 839 return ret; 840 841 /* 842 * XXX should get the powerdomain's current state here; 843 * warn & fail if it is not ON. 844 */ 845 846 pr_debug("powerdomain: %s: clearing previous power state reg\n", 847 pwrdm->name); 848 849 if (arch_pwrdm && arch_pwrdm->pwrdm_clear_all_prev_pwrst) 850 ret = arch_pwrdm->pwrdm_clear_all_prev_pwrst(pwrdm); 851 852 return ret; 853 } 854 855 /** 856 * pwrdm_enable_hdwr_sar - enable automatic hardware SAR for a pwrdm 857 * @pwrdm: struct powerdomain * 858 * 859 * Enable automatic context save-and-restore upon power state change 860 * for some devices in the powerdomain @pwrdm. Warning: this only 861 * affects a subset of devices in a powerdomain; check the TRM 862 * closely. Returns -EINVAL if the powerdomain pointer is null or if 863 * the powerdomain does not support automatic save-and-restore, or 864 * returns 0 upon success. 865 */ 866 int pwrdm_enable_hdwr_sar(struct powerdomain *pwrdm) 867 { 868 int ret = -EINVAL; 869 870 if (!pwrdm) 871 return ret; 872 873 if (!(pwrdm->flags & PWRDM_HAS_HDWR_SAR)) 874 return ret; 875 876 pr_debug("powerdomain: %s: setting SAVEANDRESTORE bit\n", pwrdm->name); 877 878 if (arch_pwrdm && arch_pwrdm->pwrdm_enable_hdwr_sar) 879 ret = arch_pwrdm->pwrdm_enable_hdwr_sar(pwrdm); 880 881 return ret; 882 } 883 884 /** 885 * pwrdm_disable_hdwr_sar - disable automatic hardware SAR for a pwrdm 886 * @pwrdm: struct powerdomain * 887 * 888 * Disable automatic context save-and-restore upon power state change 889 * for some devices in the powerdomain @pwrdm. Warning: this only 890 * affects a subset of devices in a powerdomain; check the TRM 891 * closely. Returns -EINVAL if the powerdomain pointer is null or if 892 * the powerdomain does not support automatic save-and-restore, or 893 * returns 0 upon success. 894 */ 895 int pwrdm_disable_hdwr_sar(struct powerdomain *pwrdm) 896 { 897 int ret = -EINVAL; 898 899 if (!pwrdm) 900 return ret; 901 902 if (!(pwrdm->flags & PWRDM_HAS_HDWR_SAR)) 903 return ret; 904 905 pr_debug("powerdomain: %s: clearing SAVEANDRESTORE bit\n", pwrdm->name); 906 907 if (arch_pwrdm && arch_pwrdm->pwrdm_disable_hdwr_sar) 908 ret = arch_pwrdm->pwrdm_disable_hdwr_sar(pwrdm); 909 910 return ret; 911 } 912 913 /** 914 * pwrdm_has_hdwr_sar - test whether powerdomain supports hardware SAR 915 * @pwrdm: struct powerdomain * 916 * 917 * Returns 1 if powerdomain @pwrdm supports hardware save-and-restore 918 * for some devices, or 0 if it does not. 919 */ 920 bool pwrdm_has_hdwr_sar(struct powerdomain *pwrdm) 921 { 922 return (pwrdm && pwrdm->flags & PWRDM_HAS_HDWR_SAR) ? 1 : 0; 923 } 924 925 /** 926 * pwrdm_set_lowpwrstchange - Request a low power state change 927 * @pwrdm: struct powerdomain * 928 * 929 * Allows a powerdomain to transtion to a lower power sleep state 930 * from an existing sleep state without waking up the powerdomain. 931 * Returns -EINVAL if the powerdomain pointer is null or if the 932 * powerdomain does not support LOWPOWERSTATECHANGE, or returns 0 933 * upon success. 934 */ 935 int pwrdm_set_lowpwrstchange(struct powerdomain *pwrdm) 936 { 937 int ret = -EINVAL; 938 939 if (!pwrdm) 940 return -EINVAL; 941 942 if (!(pwrdm->flags & PWRDM_HAS_LOWPOWERSTATECHANGE)) 943 return -EINVAL; 944 945 pr_debug("powerdomain: %s: setting LOWPOWERSTATECHANGE bit\n", 946 pwrdm->name); 947 948 if (arch_pwrdm && arch_pwrdm->pwrdm_set_lowpwrstchange) 949 ret = arch_pwrdm->pwrdm_set_lowpwrstchange(pwrdm); 950 951 return ret; 952 } 953 954 /** 955 * pwrdm_wait_transition - wait for powerdomain power transition to finish 956 * @pwrdm: struct powerdomain * to wait for 957 * 958 * If the powerdomain @pwrdm is in the process of a state transition, 959 * spin until it completes the power transition, or until an iteration 960 * bailout value is reached. Returns -EINVAL if the powerdomain 961 * pointer is null, -EAGAIN if the bailout value was reached, or 962 * returns 0 upon success. 963 */ 964 int pwrdm_wait_transition(struct powerdomain *pwrdm) 965 { 966 int ret = -EINVAL; 967 968 if (!pwrdm) 969 return -EINVAL; 970 971 if (arch_pwrdm && arch_pwrdm->pwrdm_wait_transition) 972 ret = arch_pwrdm->pwrdm_wait_transition(pwrdm); 973 974 return ret; 975 } 976 977 int pwrdm_state_switch(struct powerdomain *pwrdm) 978 { 979 int ret; 980 981 ret = pwrdm_wait_transition(pwrdm); 982 if (!ret) 983 ret = _pwrdm_state_switch(pwrdm, PWRDM_STATE_NOW); 984 985 return ret; 986 } 987 988 int pwrdm_pre_transition(struct powerdomain *pwrdm) 989 { 990 if (pwrdm) 991 _pwrdm_pre_transition_cb(pwrdm, NULL); 992 else 993 pwrdm_for_each(_pwrdm_pre_transition_cb, NULL); 994 995 return 0; 996 } 997 998 int pwrdm_post_transition(struct powerdomain *pwrdm) 999 { 1000 if (pwrdm) 1001 _pwrdm_post_transition_cb(pwrdm, NULL); 1002 else 1003 pwrdm_for_each(_pwrdm_post_transition_cb, NULL); 1004 1005 return 0; 1006 } 1007 1008 /** 1009 * pwrdm_get_context_loss_count - get powerdomain's context loss count 1010 * @pwrdm: struct powerdomain * to wait for 1011 * 1012 * Context loss count is the sum of powerdomain off-mode counter, the 1013 * logic off counter and the per-bank memory off counter. Returns negative 1014 * (and WARNs) upon error, otherwise, returns the context loss count. 1015 */ 1016 int pwrdm_get_context_loss_count(struct powerdomain *pwrdm) 1017 { 1018 int i, count; 1019 1020 if (!pwrdm) { 1021 WARN(1, "powerdomain: %s: pwrdm is null\n", __func__); 1022 return -ENODEV; 1023 } 1024 1025 count = pwrdm->state_counter[PWRDM_POWER_OFF]; 1026 count += pwrdm->ret_logic_off_counter; 1027 1028 for (i = 0; i < pwrdm->banks; i++) 1029 count += pwrdm->ret_mem_off_counter[i]; 1030 1031 /* 1032 * Context loss count has to be a non-negative value. Clear the sign 1033 * bit to get a value range from 0 to INT_MAX. 1034 */ 1035 count &= INT_MAX; 1036 1037 pr_debug("powerdomain: %s: context loss count = %d\n", 1038 pwrdm->name, count); 1039 1040 return count; 1041 } 1042 1043 /** 1044 * pwrdm_can_ever_lose_context - can this powerdomain ever lose context? 1045 * @pwrdm: struct powerdomain * 1046 * 1047 * Given a struct powerdomain * @pwrdm, returns 1 if the powerdomain 1048 * can lose either memory or logic context or if @pwrdm is invalid, or 1049 * returns 0 otherwise. This function is not concerned with how the 1050 * powerdomain registers are programmed (i.e., to go off or not); it's 1051 * concerned with whether it's ever possible for this powerdomain to 1052 * go off while some other part of the chip is active. This function 1053 * assumes that every powerdomain can go to either ON or INACTIVE. 1054 */ 1055 bool pwrdm_can_ever_lose_context(struct powerdomain *pwrdm) 1056 { 1057 int i; 1058 1059 if (IS_ERR_OR_NULL(pwrdm)) { 1060 pr_debug("powerdomain: %s: invalid powerdomain pointer\n", 1061 __func__); 1062 return 1; 1063 } 1064 1065 if (pwrdm->pwrsts & PWRSTS_OFF) 1066 return 1; 1067 1068 if (pwrdm->pwrsts & PWRSTS_RET) { 1069 if (pwrdm->pwrsts_logic_ret & PWRSTS_OFF) 1070 return 1; 1071 1072 for (i = 0; i < pwrdm->banks; i++) 1073 if (pwrdm->pwrsts_mem_ret[i] & PWRSTS_OFF) 1074 return 1; 1075 } 1076 1077 for (i = 0; i < pwrdm->banks; i++) 1078 if (pwrdm->pwrsts_mem_on[i] & PWRSTS_OFF) 1079 return 1; 1080 1081 return 0; 1082 } 1083