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