Paul Walmsley | ad67ef6 | 2008-08-19 11:08:40 +0300 | [diff] [blame] | 1 | /* |
| 2 | * OMAP powerdomain control |
| 3 | * |
| 4 | * Copyright (C) 2007-2008 Texas Instruments, Inc. |
| 5 | * Copyright (C) 2007-2008 Nokia Corporation |
| 6 | * |
| 7 | * Written by Paul Walmsley |
| 8 | * |
| 9 | * This program is free software; you can redistribute it and/or modify |
| 10 | * it under the terms of the GNU General Public License version 2 as |
| 11 | * published by the Free Software Foundation. |
| 12 | */ |
| 13 | #ifdef CONFIG_OMAP_DEBUG_POWERDOMAIN |
| 14 | # define DEBUG |
| 15 | #endif |
| 16 | |
| 17 | #include <linux/kernel.h> |
| 18 | #include <linux/module.h> |
| 19 | #include <linux/types.h> |
| 20 | #include <linux/delay.h> |
| 21 | #include <linux/spinlock.h> |
| 22 | #include <linux/list.h> |
| 23 | #include <linux/errno.h> |
| 24 | #include <linux/err.h> |
| 25 | #include <linux/io.h> |
| 26 | |
| 27 | #include <asm/atomic.h> |
| 28 | |
| 29 | #include "cm.h" |
| 30 | #include "cm-regbits-34xx.h" |
| 31 | #include "prm.h" |
| 32 | #include "prm-regbits-34xx.h" |
| 33 | |
| 34 | #include <mach/cpu.h> |
| 35 | #include <mach/powerdomain.h> |
Paul Walmsley | 8420bb1 | 2008-08-19 11:08:44 +0300 | [diff] [blame] | 36 | #include <mach/clockdomain.h> |
Paul Walmsley | ad67ef6 | 2008-08-19 11:08:40 +0300 | [diff] [blame] | 37 | |
| 38 | /* pwrdm_list contains all registered struct powerdomains */ |
| 39 | static LIST_HEAD(pwrdm_list); |
| 40 | |
| 41 | /* |
| 42 | * pwrdm_rwlock protects pwrdm_list add and del ops - also reused to |
| 43 | * protect pwrdm_clkdms[] during clkdm add/del ops |
| 44 | */ |
| 45 | static DEFINE_RWLOCK(pwrdm_rwlock); |
| 46 | |
| 47 | |
| 48 | /* Private functions */ |
| 49 | |
| 50 | static u32 prm_read_mod_bits_shift(s16 domain, s16 idx, u32 mask) |
| 51 | { |
| 52 | u32 v; |
| 53 | |
| 54 | v = prm_read_mod_reg(domain, idx); |
| 55 | v &= mask; |
| 56 | v >>= __ffs(mask); |
| 57 | |
| 58 | return v; |
| 59 | } |
| 60 | |
| 61 | static struct powerdomain *_pwrdm_lookup(const char *name) |
| 62 | { |
| 63 | struct powerdomain *pwrdm, *temp_pwrdm; |
| 64 | |
| 65 | pwrdm = NULL; |
| 66 | |
| 67 | list_for_each_entry(temp_pwrdm, &pwrdm_list, node) { |
| 68 | if (!strcmp(name, temp_pwrdm->name)) { |
| 69 | pwrdm = temp_pwrdm; |
| 70 | break; |
| 71 | } |
| 72 | } |
| 73 | |
| 74 | return pwrdm; |
| 75 | } |
| 76 | |
| 77 | /* _pwrdm_deps_lookup - look up the specified powerdomain in a pwrdm list */ |
| 78 | static struct powerdomain *_pwrdm_deps_lookup(struct powerdomain *pwrdm, |
| 79 | struct pwrdm_dep *deps) |
| 80 | { |
| 81 | struct pwrdm_dep *pd; |
| 82 | |
| 83 | if (!pwrdm || !deps || !omap_chip_is(pwrdm->omap_chip)) |
| 84 | return ERR_PTR(-EINVAL); |
| 85 | |
| 86 | for (pd = deps; pd; pd++) { |
| 87 | |
| 88 | if (!omap_chip_is(pd->omap_chip)) |
| 89 | continue; |
| 90 | |
| 91 | if (!pd->pwrdm && pd->pwrdm_name) |
| 92 | pd->pwrdm = pwrdm_lookup(pd->pwrdm_name); |
| 93 | |
| 94 | if (pd->pwrdm == pwrdm) |
| 95 | break; |
| 96 | |
| 97 | } |
| 98 | |
| 99 | if (!pd) |
| 100 | return ERR_PTR(-ENOENT); |
| 101 | |
| 102 | return pd->pwrdm; |
| 103 | } |
| 104 | |
| 105 | |
| 106 | /* Public functions */ |
| 107 | |
| 108 | /** |
| 109 | * pwrdm_init - set up the powerdomain layer |
| 110 | * |
| 111 | * Loop through the list of powerdomains, registering all that are |
| 112 | * available on the current CPU. If pwrdm_list is supplied and not |
| 113 | * null, all of the referenced powerdomains will be registered. No |
| 114 | * return value. |
| 115 | */ |
| 116 | void pwrdm_init(struct powerdomain **pwrdm_list) |
| 117 | { |
| 118 | struct powerdomain **p = NULL; |
| 119 | |
| 120 | if (pwrdm_list) |
| 121 | for (p = pwrdm_list; *p; p++) |
| 122 | pwrdm_register(*p); |
| 123 | } |
| 124 | |
| 125 | /** |
| 126 | * pwrdm_register - register a powerdomain |
| 127 | * @pwrdm: struct powerdomain * to register |
| 128 | * |
| 129 | * Adds a powerdomain to the internal powerdomain list. Returns |
| 130 | * -EINVAL if given a null pointer, -EEXIST if a powerdomain is |
| 131 | * already registered by the provided name, or 0 upon success. |
| 132 | */ |
| 133 | int pwrdm_register(struct powerdomain *pwrdm) |
| 134 | { |
| 135 | unsigned long flags; |
| 136 | int ret = -EINVAL; |
| 137 | |
| 138 | if (!pwrdm) |
| 139 | return -EINVAL; |
| 140 | |
| 141 | if (!omap_chip_is(pwrdm->omap_chip)) |
| 142 | return -EINVAL; |
| 143 | |
| 144 | write_lock_irqsave(&pwrdm_rwlock, flags); |
| 145 | if (_pwrdm_lookup(pwrdm->name)) { |
| 146 | ret = -EEXIST; |
| 147 | goto pr_unlock; |
| 148 | } |
| 149 | |
| 150 | list_add(&pwrdm->node, &pwrdm_list); |
| 151 | |
| 152 | pr_debug("powerdomain: registered %s\n", pwrdm->name); |
| 153 | ret = 0; |
| 154 | |
| 155 | pr_unlock: |
| 156 | write_unlock_irqrestore(&pwrdm_rwlock, flags); |
| 157 | |
| 158 | return ret; |
| 159 | } |
| 160 | |
| 161 | /** |
| 162 | * pwrdm_unregister - unregister a powerdomain |
| 163 | * @pwrdm: struct powerdomain * to unregister |
| 164 | * |
| 165 | * Removes a powerdomain from the internal powerdomain list. Returns |
| 166 | * -EINVAL if pwrdm argument is NULL. |
| 167 | */ |
| 168 | int pwrdm_unregister(struct powerdomain *pwrdm) |
| 169 | { |
| 170 | unsigned long flags; |
| 171 | |
| 172 | if (!pwrdm) |
| 173 | return -EINVAL; |
| 174 | |
| 175 | write_lock_irqsave(&pwrdm_rwlock, flags); |
| 176 | list_del(&pwrdm->node); |
| 177 | write_unlock_irqrestore(&pwrdm_rwlock, flags); |
| 178 | |
| 179 | pr_debug("powerdomain: unregistered %s\n", pwrdm->name); |
| 180 | |
| 181 | return 0; |
| 182 | } |
| 183 | |
| 184 | /** |
| 185 | * pwrdm_lookup - look up a powerdomain by name, return a pointer |
| 186 | * @name: name of powerdomain |
| 187 | * |
| 188 | * Find a registered powerdomain by its name. Returns a pointer to the |
| 189 | * struct powerdomain if found, or NULL otherwise. |
| 190 | */ |
| 191 | struct powerdomain *pwrdm_lookup(const char *name) |
| 192 | { |
| 193 | struct powerdomain *pwrdm; |
| 194 | unsigned long flags; |
| 195 | |
| 196 | if (!name) |
| 197 | return NULL; |
| 198 | |
| 199 | read_lock_irqsave(&pwrdm_rwlock, flags); |
| 200 | pwrdm = _pwrdm_lookup(name); |
| 201 | read_unlock_irqrestore(&pwrdm_rwlock, flags); |
| 202 | |
| 203 | return pwrdm; |
| 204 | } |
| 205 | |
| 206 | /** |
| 207 | * pwrdm_for_each - call function on each registered clockdomain |
| 208 | * @fn: callback function * |
| 209 | * |
| 210 | * Call the supplied function for each registered powerdomain. The |
| 211 | * callback function can return anything but 0 to bail out early from |
| 212 | * the iterator. The callback function is called with the pwrdm_rwlock |
| 213 | * held for reading, so no powerdomain structure manipulation |
| 214 | * functions should be called from the callback, although hardware |
| 215 | * powerdomain control functions are fine. Returns the last return |
| 216 | * value of the callback function, which should be 0 for success or |
| 217 | * anything else to indicate failure; or -EINVAL if the function |
| 218 | * pointer is null. |
| 219 | */ |
| 220 | int pwrdm_for_each(int (*fn)(struct powerdomain *pwrdm)) |
| 221 | { |
| 222 | struct powerdomain *temp_pwrdm; |
| 223 | unsigned long flags; |
| 224 | int ret = 0; |
| 225 | |
| 226 | if (!fn) |
| 227 | return -EINVAL; |
| 228 | |
| 229 | read_lock_irqsave(&pwrdm_rwlock, flags); |
| 230 | list_for_each_entry(temp_pwrdm, &pwrdm_list, node) { |
| 231 | ret = (*fn)(temp_pwrdm); |
| 232 | if (ret) |
| 233 | break; |
| 234 | } |
| 235 | read_unlock_irqrestore(&pwrdm_rwlock, flags); |
| 236 | |
| 237 | return ret; |
| 238 | } |
| 239 | |
| 240 | /** |
Paul Walmsley | 8420bb1 | 2008-08-19 11:08:44 +0300 | [diff] [blame] | 241 | * pwrdm_add_clkdm - add a clockdomain to a powerdomain |
| 242 | * @pwrdm: struct powerdomain * to add the clockdomain to |
| 243 | * @clkdm: struct clockdomain * to associate with a powerdomain |
| 244 | * |
| 245 | * Associate the clockdomain 'clkdm' with a powerdomain 'pwrdm'. This |
| 246 | * enables the use of pwrdm_for_each_clkdm(). Returns -EINVAL if |
| 247 | * presented with invalid pointers; -ENOMEM if memory could not be allocated; |
| 248 | * or 0 upon success. |
| 249 | */ |
| 250 | int pwrdm_add_clkdm(struct powerdomain *pwrdm, struct clockdomain *clkdm) |
| 251 | { |
| 252 | unsigned long flags; |
| 253 | int i; |
| 254 | int ret = -EINVAL; |
| 255 | |
| 256 | if (!pwrdm || !clkdm) |
| 257 | return -EINVAL; |
| 258 | |
| 259 | pr_debug("powerdomain: associating clockdomain %s with powerdomain " |
| 260 | "%s\n", clkdm->name, pwrdm->name); |
| 261 | |
| 262 | write_lock_irqsave(&pwrdm_rwlock, flags); |
| 263 | |
| 264 | for (i = 0; i < PWRDM_MAX_CLKDMS; i++) { |
| 265 | if (!pwrdm->pwrdm_clkdms[i]) |
| 266 | break; |
| 267 | #ifdef DEBUG |
| 268 | if (pwrdm->pwrdm_clkdms[i] == clkdm) { |
| 269 | ret = -EINVAL; |
| 270 | goto pac_exit; |
| 271 | } |
| 272 | #endif |
| 273 | } |
| 274 | |
| 275 | if (i == PWRDM_MAX_CLKDMS) { |
| 276 | pr_debug("powerdomain: increase PWRDM_MAX_CLKDMS for " |
| 277 | "pwrdm %s clkdm %s\n", pwrdm->name, clkdm->name); |
| 278 | WARN_ON(1); |
| 279 | ret = -ENOMEM; |
| 280 | goto pac_exit; |
| 281 | } |
| 282 | |
| 283 | pwrdm->pwrdm_clkdms[i] = clkdm; |
| 284 | |
| 285 | ret = 0; |
| 286 | |
| 287 | pac_exit: |
| 288 | write_unlock_irqrestore(&pwrdm_rwlock, flags); |
| 289 | |
| 290 | return ret; |
| 291 | } |
| 292 | |
| 293 | /** |
| 294 | * pwrdm_del_clkdm - remove a clockdomain from a powerdomain |
| 295 | * @pwrdm: struct powerdomain * to add the clockdomain to |
| 296 | * @clkdm: struct clockdomain * to associate with a powerdomain |
| 297 | * |
| 298 | * Dissociate the clockdomain 'clkdm' from the powerdomain |
| 299 | * 'pwrdm'. Returns -EINVAL if presented with invalid pointers; |
| 300 | * -ENOENT if the clkdm was not associated with the powerdomain, or 0 |
| 301 | * upon success. |
| 302 | */ |
| 303 | int pwrdm_del_clkdm(struct powerdomain *pwrdm, struct clockdomain *clkdm) |
| 304 | { |
| 305 | unsigned long flags; |
| 306 | int ret = -EINVAL; |
| 307 | int i; |
| 308 | |
| 309 | if (!pwrdm || !clkdm) |
| 310 | return -EINVAL; |
| 311 | |
| 312 | pr_debug("powerdomain: dissociating clockdomain %s from powerdomain " |
| 313 | "%s\n", clkdm->name, pwrdm->name); |
| 314 | |
| 315 | write_lock_irqsave(&pwrdm_rwlock, flags); |
| 316 | |
| 317 | for (i = 0; i < PWRDM_MAX_CLKDMS; i++) |
| 318 | if (pwrdm->pwrdm_clkdms[i] == clkdm) |
| 319 | break; |
| 320 | |
| 321 | if (i == PWRDM_MAX_CLKDMS) { |
| 322 | pr_debug("powerdomain: clkdm %s not associated with pwrdm " |
| 323 | "%s ?!\n", clkdm->name, pwrdm->name); |
| 324 | ret = -ENOENT; |
| 325 | goto pdc_exit; |
| 326 | } |
| 327 | |
| 328 | pwrdm->pwrdm_clkdms[i] = NULL; |
| 329 | |
| 330 | ret = 0; |
| 331 | |
| 332 | pdc_exit: |
| 333 | write_unlock_irqrestore(&pwrdm_rwlock, flags); |
| 334 | |
| 335 | return ret; |
| 336 | } |
| 337 | |
| 338 | /** |
| 339 | * pwrdm_for_each_clkdm - call function on each clkdm in a pwrdm |
| 340 | * @pwrdm: struct powerdomain * to iterate over |
| 341 | * @fn: callback function * |
| 342 | * |
| 343 | * Call the supplied function for each clockdomain in the powerdomain |
| 344 | * 'pwrdm'. The callback function can return anything but 0 to bail |
| 345 | * out early from the iterator. The callback function is called with |
| 346 | * the pwrdm_rwlock held for reading, so no powerdomain structure |
| 347 | * manipulation functions should be called from the callback, although |
| 348 | * hardware powerdomain control functions are fine. Returns -EINVAL |
| 349 | * if presented with invalid pointers; or passes along the last return |
| 350 | * value of the callback function, which should be 0 for success or |
| 351 | * anything else to indicate failure. |
| 352 | */ |
| 353 | int pwrdm_for_each_clkdm(struct powerdomain *pwrdm, |
| 354 | int (*fn)(struct powerdomain *pwrdm, |
| 355 | struct clockdomain *clkdm)) |
| 356 | { |
| 357 | unsigned long flags; |
| 358 | int ret = 0; |
| 359 | int i; |
| 360 | |
| 361 | if (!fn) |
| 362 | return -EINVAL; |
| 363 | |
| 364 | read_lock_irqsave(&pwrdm_rwlock, flags); |
| 365 | |
| 366 | for (i = 0; i < PWRDM_MAX_CLKDMS && !ret; i++) |
| 367 | ret = (*fn)(pwrdm, pwrdm->pwrdm_clkdms[i]); |
| 368 | |
| 369 | read_unlock_irqrestore(&pwrdm_rwlock, flags); |
| 370 | |
| 371 | return ret; |
| 372 | } |
| 373 | |
| 374 | |
| 375 | /** |
Paul Walmsley | ad67ef6 | 2008-08-19 11:08:40 +0300 | [diff] [blame] | 376 | * pwrdm_add_wkdep - add a wakeup dependency from pwrdm2 to pwrdm1 |
| 377 | * @pwrdm1: wake this struct powerdomain * up (dependent) |
| 378 | * @pwrdm2: when this struct powerdomain * wakes up (source) |
| 379 | * |
| 380 | * When the powerdomain represented by pwrdm2 wakes up (due to an |
| 381 | * interrupt), wake up pwrdm1. Implemented in hardware on the OMAP, |
| 382 | * this feature is designed to reduce wakeup latency of the dependent |
| 383 | * powerdomain. Returns -EINVAL if presented with invalid powerdomain |
| 384 | * pointers, -ENOENT if pwrdm2 cannot wake up pwrdm1 in hardware, or |
| 385 | * 0 upon success. |
| 386 | */ |
| 387 | int pwrdm_add_wkdep(struct powerdomain *pwrdm1, struct powerdomain *pwrdm2) |
| 388 | { |
| 389 | struct powerdomain *p; |
| 390 | |
| 391 | if (!pwrdm1) |
| 392 | return -EINVAL; |
| 393 | |
| 394 | p = _pwrdm_deps_lookup(pwrdm2, pwrdm1->wkdep_srcs); |
| 395 | if (IS_ERR(p)) { |
| 396 | pr_debug("powerdomain: hardware cannot set/clear wake up of " |
| 397 | "%s when %s wakes up\n", pwrdm1->name, pwrdm2->name); |
| 398 | return IS_ERR(p); |
| 399 | } |
| 400 | |
| 401 | pr_debug("powerdomain: hardware will wake up %s when %s wakes up\n", |
| 402 | pwrdm1->name, pwrdm2->name); |
| 403 | |
| 404 | prm_set_mod_reg_bits((1 << pwrdm2->dep_bit), |
| 405 | pwrdm1->prcm_offs, PM_WKDEP); |
| 406 | |
| 407 | return 0; |
| 408 | } |
| 409 | |
| 410 | /** |
| 411 | * pwrdm_del_wkdep - remove a wakeup dependency from pwrdm2 to pwrdm1 |
| 412 | * @pwrdm1: wake this struct powerdomain * up (dependent) |
| 413 | * @pwrdm2: when this struct powerdomain * wakes up (source) |
| 414 | * |
| 415 | * Remove a wakeup dependency that causes pwrdm1 to wake up when pwrdm2 |
| 416 | * wakes up. Returns -EINVAL if presented with invalid powerdomain |
| 417 | * pointers, -ENOENT if pwrdm2 cannot wake up pwrdm1 in hardware, or |
| 418 | * 0 upon success. |
| 419 | */ |
| 420 | int pwrdm_del_wkdep(struct powerdomain *pwrdm1, struct powerdomain *pwrdm2) |
| 421 | { |
| 422 | struct powerdomain *p; |
| 423 | |
| 424 | if (!pwrdm1) |
| 425 | return -EINVAL; |
| 426 | |
| 427 | p = _pwrdm_deps_lookup(pwrdm2, pwrdm1->wkdep_srcs); |
| 428 | if (IS_ERR(p)) { |
| 429 | pr_debug("powerdomain: hardware cannot set/clear wake up of " |
| 430 | "%s when %s wakes up\n", pwrdm1->name, pwrdm2->name); |
| 431 | return IS_ERR(p); |
| 432 | } |
| 433 | |
| 434 | pr_debug("powerdomain: hardware will no longer wake up %s after %s " |
| 435 | "wakes up\n", pwrdm1->name, pwrdm2->name); |
| 436 | |
| 437 | prm_clear_mod_reg_bits((1 << pwrdm2->dep_bit), |
| 438 | pwrdm1->prcm_offs, PM_WKDEP); |
| 439 | |
| 440 | return 0; |
| 441 | } |
| 442 | |
| 443 | /** |
| 444 | * pwrdm_read_wkdep - read wakeup dependency state from pwrdm2 to pwrdm1 |
| 445 | * @pwrdm1: wake this struct powerdomain * up (dependent) |
| 446 | * @pwrdm2: when this struct powerdomain * wakes up (source) |
| 447 | * |
| 448 | * Return 1 if a hardware wakeup dependency exists wherein pwrdm1 will be |
| 449 | * awoken when pwrdm2 wakes up; 0 if dependency is not set; -EINVAL |
| 450 | * if either powerdomain pointer is invalid; or -ENOENT if the hardware |
| 451 | * is incapable. |
| 452 | * |
| 453 | * REVISIT: Currently this function only represents software-controllable |
| 454 | * wakeup dependencies. Wakeup dependencies fixed in hardware are not |
| 455 | * yet handled here. |
| 456 | */ |
| 457 | int pwrdm_read_wkdep(struct powerdomain *pwrdm1, struct powerdomain *pwrdm2) |
| 458 | { |
| 459 | struct powerdomain *p; |
| 460 | |
| 461 | if (!pwrdm1) |
| 462 | return -EINVAL; |
| 463 | |
| 464 | p = _pwrdm_deps_lookup(pwrdm2, pwrdm1->wkdep_srcs); |
| 465 | if (IS_ERR(p)) { |
| 466 | pr_debug("powerdomain: hardware cannot set/clear wake up of " |
| 467 | "%s when %s wakes up\n", pwrdm1->name, pwrdm2->name); |
| 468 | return IS_ERR(p); |
| 469 | } |
| 470 | |
| 471 | return prm_read_mod_bits_shift(pwrdm1->prcm_offs, PM_WKDEP, |
| 472 | (1 << pwrdm2->dep_bit)); |
| 473 | } |
| 474 | |
| 475 | /** |
| 476 | * pwrdm_add_sleepdep - add a sleep dependency from pwrdm2 to pwrdm1 |
| 477 | * @pwrdm1: prevent this struct powerdomain * from sleeping (dependent) |
| 478 | * @pwrdm2: when this struct powerdomain * is active (source) |
| 479 | * |
| 480 | * Prevent pwrdm1 from automatically going inactive (and then to |
| 481 | * retention or off) if pwrdm2 is still active. Returns -EINVAL if |
| 482 | * presented with invalid powerdomain pointers or called on a machine |
| 483 | * that does not support software-configurable hardware sleep dependencies, |
| 484 | * -ENOENT if the specified dependency cannot be set in hardware, or |
| 485 | * 0 upon success. |
| 486 | */ |
| 487 | int pwrdm_add_sleepdep(struct powerdomain *pwrdm1, struct powerdomain *pwrdm2) |
| 488 | { |
| 489 | struct powerdomain *p; |
| 490 | |
| 491 | if (!pwrdm1) |
| 492 | return -EINVAL; |
| 493 | |
| 494 | if (!cpu_is_omap34xx()) |
| 495 | return -EINVAL; |
| 496 | |
| 497 | p = _pwrdm_deps_lookup(pwrdm2, pwrdm1->sleepdep_srcs); |
| 498 | if (IS_ERR(p)) { |
| 499 | pr_debug("powerdomain: hardware cannot set/clear sleep " |
| 500 | "dependency affecting %s from %s\n", pwrdm1->name, |
| 501 | pwrdm2->name); |
| 502 | return IS_ERR(p); |
| 503 | } |
| 504 | |
| 505 | pr_debug("powerdomain: will prevent %s from sleeping if %s is active\n", |
| 506 | pwrdm1->name, pwrdm2->name); |
| 507 | |
| 508 | cm_set_mod_reg_bits((1 << pwrdm2->dep_bit), |
| 509 | pwrdm1->prcm_offs, OMAP3430_CM_SLEEPDEP); |
| 510 | |
| 511 | return 0; |
| 512 | } |
| 513 | |
| 514 | /** |
| 515 | * pwrdm_del_sleepdep - remove a sleep dependency from pwrdm2 to pwrdm1 |
| 516 | * @pwrdm1: prevent this struct powerdomain * from sleeping (dependent) |
| 517 | * @pwrdm2: when this struct powerdomain * is active (source) |
| 518 | * |
| 519 | * Allow pwrdm1 to automatically go inactive (and then to retention or |
| 520 | * off), independent of the activity state of pwrdm2. Returns -EINVAL |
| 521 | * if presented with invalid powerdomain pointers or called on a machine |
| 522 | * that does not support software-configurable hardware sleep dependencies, |
| 523 | * -ENOENT if the specified dependency cannot be cleared in hardware, or |
| 524 | * 0 upon success. |
| 525 | */ |
| 526 | int pwrdm_del_sleepdep(struct powerdomain *pwrdm1, struct powerdomain *pwrdm2) |
| 527 | { |
| 528 | struct powerdomain *p; |
| 529 | |
| 530 | if (!pwrdm1) |
| 531 | return -EINVAL; |
| 532 | |
| 533 | if (!cpu_is_omap34xx()) |
| 534 | return -EINVAL; |
| 535 | |
| 536 | p = _pwrdm_deps_lookup(pwrdm2, pwrdm1->sleepdep_srcs); |
| 537 | if (IS_ERR(p)) { |
| 538 | pr_debug("powerdomain: hardware cannot set/clear sleep " |
| 539 | "dependency affecting %s from %s\n", pwrdm1->name, |
| 540 | pwrdm2->name); |
| 541 | return IS_ERR(p); |
| 542 | } |
| 543 | |
| 544 | pr_debug("powerdomain: will no longer prevent %s from sleeping if " |
| 545 | "%s is active\n", pwrdm1->name, pwrdm2->name); |
| 546 | |
| 547 | cm_clear_mod_reg_bits((1 << pwrdm2->dep_bit), |
| 548 | pwrdm1->prcm_offs, OMAP3430_CM_SLEEPDEP); |
| 549 | |
| 550 | return 0; |
| 551 | } |
| 552 | |
| 553 | /** |
| 554 | * pwrdm_read_sleepdep - read sleep dependency state from pwrdm2 to pwrdm1 |
| 555 | * @pwrdm1: prevent this struct powerdomain * from sleeping (dependent) |
| 556 | * @pwrdm2: when this struct powerdomain * is active (source) |
| 557 | * |
| 558 | * Return 1 if a hardware sleep dependency exists wherein pwrdm1 will |
| 559 | * not be allowed to automatically go inactive if pwrdm2 is active; |
| 560 | * 0 if pwrdm1's automatic power state inactivity transition is independent |
| 561 | * of pwrdm2's; -EINVAL if either powerdomain pointer is invalid or called |
| 562 | * on a machine that does not support software-configurable hardware sleep |
| 563 | * dependencies; or -ENOENT if the hardware is incapable. |
| 564 | * |
| 565 | * REVISIT: Currently this function only represents software-controllable |
| 566 | * sleep dependencies. Sleep dependencies fixed in hardware are not |
| 567 | * yet handled here. |
| 568 | */ |
| 569 | int pwrdm_read_sleepdep(struct powerdomain *pwrdm1, struct powerdomain *pwrdm2) |
| 570 | { |
| 571 | struct powerdomain *p; |
| 572 | |
| 573 | if (!pwrdm1) |
| 574 | return -EINVAL; |
| 575 | |
| 576 | if (!cpu_is_omap34xx()) |
| 577 | return -EINVAL; |
| 578 | |
| 579 | p = _pwrdm_deps_lookup(pwrdm2, pwrdm1->sleepdep_srcs); |
| 580 | if (IS_ERR(p)) { |
| 581 | pr_debug("powerdomain: hardware cannot set/clear sleep " |
| 582 | "dependency affecting %s from %s\n", pwrdm1->name, |
| 583 | pwrdm2->name); |
| 584 | return IS_ERR(p); |
| 585 | } |
| 586 | |
| 587 | return prm_read_mod_bits_shift(pwrdm1->prcm_offs, OMAP3430_CM_SLEEPDEP, |
| 588 | (1 << pwrdm2->dep_bit)); |
| 589 | } |
| 590 | |
| 591 | /** |
| 592 | * pwrdm_get_mem_bank_count - get number of memory banks in this powerdomain |
| 593 | * @pwrdm: struct powerdomain * |
| 594 | * |
| 595 | * Return the number of controllable memory banks in powerdomain pwrdm, |
| 596 | * starting with 1. Returns -EINVAL if the powerdomain pointer is null. |
| 597 | */ |
| 598 | int pwrdm_get_mem_bank_count(struct powerdomain *pwrdm) |
| 599 | { |
| 600 | if (!pwrdm) |
| 601 | return -EINVAL; |
| 602 | |
| 603 | return pwrdm->banks; |
| 604 | } |
| 605 | |
| 606 | /** |
| 607 | * pwrdm_set_next_pwrst - set next powerdomain power state |
| 608 | * @pwrdm: struct powerdomain * to set |
| 609 | * @pwrst: one of the PWRDM_POWER_* macros |
| 610 | * |
| 611 | * Set the powerdomain pwrdm's next power state to pwrst. The powerdomain |
| 612 | * may not enter this state immediately if the preconditions for this state |
| 613 | * have not been satisfied. Returns -EINVAL if the powerdomain pointer is |
| 614 | * null or if the power state is invalid for the powerdomin, or returns 0 |
| 615 | * upon success. |
| 616 | */ |
| 617 | int pwrdm_set_next_pwrst(struct powerdomain *pwrdm, u8 pwrst) |
| 618 | { |
| 619 | if (!pwrdm) |
| 620 | return -EINVAL; |
| 621 | |
| 622 | if (!(pwrdm->pwrsts & (1 << pwrst))) |
| 623 | return -EINVAL; |
| 624 | |
| 625 | pr_debug("powerdomain: setting next powerstate for %s to %0x\n", |
| 626 | pwrdm->name, pwrst); |
| 627 | |
| 628 | prm_rmw_mod_reg_bits(OMAP_POWERSTATE_MASK, |
| 629 | (pwrst << OMAP_POWERSTATE_SHIFT), |
| 630 | pwrdm->prcm_offs, PM_PWSTCTRL); |
| 631 | |
| 632 | return 0; |
| 633 | } |
| 634 | |
| 635 | /** |
| 636 | * pwrdm_read_next_pwrst - get next powerdomain power state |
| 637 | * @pwrdm: struct powerdomain * to get power state |
| 638 | * |
| 639 | * Return the powerdomain pwrdm's next power state. Returns -EINVAL |
| 640 | * if the powerdomain pointer is null or returns the next power state |
| 641 | * upon success. |
| 642 | */ |
| 643 | int pwrdm_read_next_pwrst(struct powerdomain *pwrdm) |
| 644 | { |
| 645 | if (!pwrdm) |
| 646 | return -EINVAL; |
| 647 | |
| 648 | return prm_read_mod_bits_shift(pwrdm->prcm_offs, PM_PWSTCTRL, |
| 649 | OMAP_POWERSTATE_MASK); |
| 650 | } |
| 651 | |
| 652 | /** |
| 653 | * pwrdm_read_pwrst - get current powerdomain power state |
| 654 | * @pwrdm: struct powerdomain * to get power state |
| 655 | * |
| 656 | * Return the powerdomain pwrdm's current power state. Returns -EINVAL |
| 657 | * if the powerdomain pointer is null or returns the current power state |
| 658 | * upon success. |
| 659 | */ |
| 660 | int pwrdm_read_pwrst(struct powerdomain *pwrdm) |
| 661 | { |
| 662 | if (!pwrdm) |
| 663 | return -EINVAL; |
| 664 | |
| 665 | return prm_read_mod_bits_shift(pwrdm->prcm_offs, PM_PWSTST, |
| 666 | OMAP_POWERSTATEST_MASK); |
| 667 | } |
| 668 | |
| 669 | /** |
| 670 | * pwrdm_read_prev_pwrst - get previous powerdomain power state |
| 671 | * @pwrdm: struct powerdomain * to get previous power state |
| 672 | * |
| 673 | * Return the powerdomain pwrdm's previous power state. Returns -EINVAL |
| 674 | * if the powerdomain pointer is null or returns the previous power state |
| 675 | * upon success. |
| 676 | */ |
| 677 | int pwrdm_read_prev_pwrst(struct powerdomain *pwrdm) |
| 678 | { |
| 679 | if (!pwrdm) |
| 680 | return -EINVAL; |
| 681 | |
| 682 | return prm_read_mod_bits_shift(pwrdm->prcm_offs, OMAP3430_PM_PREPWSTST, |
| 683 | OMAP3430_LASTPOWERSTATEENTERED_MASK); |
| 684 | } |
| 685 | |
| 686 | /** |
| 687 | * pwrdm_set_logic_retst - set powerdomain logic power state upon retention |
| 688 | * @pwrdm: struct powerdomain * to set |
| 689 | * @pwrst: one of the PWRDM_POWER_* macros |
| 690 | * |
| 691 | * Set the next power state that the logic portion of the powerdomain |
| 692 | * pwrdm will enter when the powerdomain enters retention. This will |
| 693 | * be either RETENTION or OFF, if supported. Returns -EINVAL if the |
| 694 | * powerdomain pointer is null or the target power state is not not |
| 695 | * supported, or returns 0 upon success. |
| 696 | */ |
| 697 | int pwrdm_set_logic_retst(struct powerdomain *pwrdm, u8 pwrst) |
| 698 | { |
| 699 | if (!pwrdm) |
| 700 | return -EINVAL; |
| 701 | |
| 702 | if (!(pwrdm->pwrsts_logic_ret & (1 << pwrst))) |
| 703 | return -EINVAL; |
| 704 | |
| 705 | pr_debug("powerdomain: setting next logic powerstate for %s to %0x\n", |
| 706 | pwrdm->name, pwrst); |
| 707 | |
| 708 | /* |
| 709 | * The register bit names below may not correspond to the |
| 710 | * actual names of the bits in each powerdomain's register, |
| 711 | * but the type of value returned is the same for each |
| 712 | * powerdomain. |
| 713 | */ |
| 714 | prm_rmw_mod_reg_bits(OMAP3430_LOGICL1CACHERETSTATE, |
| 715 | (pwrst << __ffs(OMAP3430_LOGICL1CACHERETSTATE)), |
| 716 | pwrdm->prcm_offs, PM_PWSTCTRL); |
| 717 | |
| 718 | return 0; |
| 719 | } |
| 720 | |
| 721 | /** |
| 722 | * pwrdm_set_mem_onst - set memory power state while powerdomain ON |
| 723 | * @pwrdm: struct powerdomain * to set |
| 724 | * @bank: memory bank number to set (0-3) |
| 725 | * @pwrst: one of the PWRDM_POWER_* macros |
| 726 | * |
| 727 | * Set the next power state that memory bank x of the powerdomain |
| 728 | * pwrdm will enter when the powerdomain enters the ON state. Bank |
| 729 | * will be a number from 0 to 3, and represents different types of |
| 730 | * memory, depending on the powerdomain. Returns -EINVAL if the |
| 731 | * powerdomain pointer is null or the target power state is not not |
| 732 | * supported for this memory bank, -EEXIST if the target memory bank |
| 733 | * does not exist or is not controllable, or returns 0 upon success. |
| 734 | */ |
| 735 | int pwrdm_set_mem_onst(struct powerdomain *pwrdm, u8 bank, u8 pwrst) |
| 736 | { |
| 737 | u32 m; |
| 738 | |
| 739 | if (!pwrdm) |
| 740 | return -EINVAL; |
| 741 | |
| 742 | if (pwrdm->banks < (bank + 1)) |
| 743 | return -EEXIST; |
| 744 | |
| 745 | if (!(pwrdm->pwrsts_mem_on[bank] & (1 << pwrst))) |
| 746 | return -EINVAL; |
| 747 | |
| 748 | pr_debug("powerdomain: setting next memory powerstate for domain %s " |
| 749 | "bank %0x while pwrdm-ON to %0x\n", pwrdm->name, bank, pwrst); |
| 750 | |
| 751 | /* |
| 752 | * The register bit names below may not correspond to the |
| 753 | * actual names of the bits in each powerdomain's register, |
| 754 | * but the type of value returned is the same for each |
| 755 | * powerdomain. |
| 756 | */ |
| 757 | switch (bank) { |
| 758 | case 0: |
| 759 | m = OMAP3430_SHAREDL1CACHEFLATONSTATE_MASK; |
| 760 | break; |
| 761 | case 1: |
| 762 | m = OMAP3430_L1FLATMEMONSTATE_MASK; |
| 763 | break; |
| 764 | case 2: |
| 765 | m = OMAP3430_SHAREDL2CACHEFLATONSTATE_MASK; |
| 766 | break; |
| 767 | case 3: |
| 768 | m = OMAP3430_L2FLATMEMONSTATE_MASK; |
| 769 | break; |
| 770 | default: |
| 771 | WARN_ON(1); /* should never happen */ |
| 772 | return -EEXIST; |
| 773 | } |
| 774 | |
| 775 | prm_rmw_mod_reg_bits(m, (pwrst << __ffs(m)), |
| 776 | pwrdm->prcm_offs, PM_PWSTCTRL); |
| 777 | |
| 778 | return 0; |
| 779 | } |
| 780 | |
| 781 | /** |
| 782 | * pwrdm_set_mem_retst - set memory power state while powerdomain in RET |
| 783 | * @pwrdm: struct powerdomain * to set |
| 784 | * @bank: memory bank number to set (0-3) |
| 785 | * @pwrst: one of the PWRDM_POWER_* macros |
| 786 | * |
| 787 | * Set the next power state that memory bank x of the powerdomain |
| 788 | * pwrdm will enter when the powerdomain enters the RETENTION state. |
| 789 | * Bank will be a number from 0 to 3, and represents different types |
| 790 | * of memory, depending on the powerdomain. pwrst will be either |
| 791 | * RETENTION or OFF, if supported. Returns -EINVAL if the powerdomain |
| 792 | * pointer is null or the target power state is not not supported for |
| 793 | * this memory bank, -EEXIST if the target memory bank does not exist |
| 794 | * or is not controllable, or returns 0 upon success. |
| 795 | */ |
| 796 | int pwrdm_set_mem_retst(struct powerdomain *pwrdm, u8 bank, u8 pwrst) |
| 797 | { |
| 798 | u32 m; |
| 799 | |
| 800 | if (!pwrdm) |
| 801 | return -EINVAL; |
| 802 | |
| 803 | if (pwrdm->banks < (bank + 1)) |
| 804 | return -EEXIST; |
| 805 | |
| 806 | if (!(pwrdm->pwrsts_mem_ret[bank] & (1 << pwrst))) |
| 807 | return -EINVAL; |
| 808 | |
| 809 | pr_debug("powerdomain: setting next memory powerstate for domain %s " |
| 810 | "bank %0x while pwrdm-RET to %0x\n", pwrdm->name, bank, pwrst); |
| 811 | |
| 812 | /* |
| 813 | * The register bit names below may not correspond to the |
| 814 | * actual names of the bits in each powerdomain's register, |
| 815 | * but the type of value returned is the same for each |
| 816 | * powerdomain. |
| 817 | */ |
| 818 | switch (bank) { |
| 819 | case 0: |
| 820 | m = OMAP3430_SHAREDL1CACHEFLATRETSTATE; |
| 821 | break; |
| 822 | case 1: |
| 823 | m = OMAP3430_L1FLATMEMRETSTATE; |
| 824 | break; |
| 825 | case 2: |
| 826 | m = OMAP3430_SHAREDL2CACHEFLATRETSTATE; |
| 827 | break; |
| 828 | case 3: |
| 829 | m = OMAP3430_L2FLATMEMRETSTATE; |
| 830 | break; |
| 831 | default: |
| 832 | WARN_ON(1); /* should never happen */ |
| 833 | return -EEXIST; |
| 834 | } |
| 835 | |
| 836 | prm_rmw_mod_reg_bits(m, (pwrst << __ffs(m)), pwrdm->prcm_offs, |
| 837 | PM_PWSTCTRL); |
| 838 | |
| 839 | return 0; |
| 840 | } |
| 841 | |
| 842 | /** |
| 843 | * pwrdm_read_logic_pwrst - get current powerdomain logic retention power state |
| 844 | * @pwrdm: struct powerdomain * to get current logic retention power state |
| 845 | * |
| 846 | * Return the current power state that the logic portion of |
| 847 | * powerdomain pwrdm will enter |
| 848 | * Returns -EINVAL if the powerdomain pointer is null or returns the |
| 849 | * current logic retention power state upon success. |
| 850 | */ |
| 851 | int pwrdm_read_logic_pwrst(struct powerdomain *pwrdm) |
| 852 | { |
| 853 | if (!pwrdm) |
| 854 | return -EINVAL; |
| 855 | |
| 856 | return prm_read_mod_bits_shift(pwrdm->prcm_offs, PM_PWSTST, |
| 857 | OMAP3430_LOGICSTATEST); |
| 858 | } |
| 859 | |
| 860 | /** |
| 861 | * pwrdm_read_prev_logic_pwrst - get previous powerdomain logic power state |
| 862 | * @pwrdm: struct powerdomain * to get previous logic power state |
| 863 | * |
| 864 | * Return the powerdomain pwrdm's logic power state. Returns -EINVAL |
| 865 | * if the powerdomain pointer is null or returns the previous logic |
| 866 | * power state upon success. |
| 867 | */ |
| 868 | int pwrdm_read_prev_logic_pwrst(struct powerdomain *pwrdm) |
| 869 | { |
| 870 | if (!pwrdm) |
| 871 | return -EINVAL; |
| 872 | |
| 873 | /* |
| 874 | * The register bit names below may not correspond to the |
| 875 | * actual names of the bits in each powerdomain's register, |
| 876 | * but the type of value returned is the same for each |
| 877 | * powerdomain. |
| 878 | */ |
| 879 | return prm_read_mod_bits_shift(pwrdm->prcm_offs, OMAP3430_PM_PREPWSTST, |
| 880 | OMAP3430_LASTLOGICSTATEENTERED); |
| 881 | } |
| 882 | |
| 883 | /** |
| 884 | * pwrdm_read_mem_pwrst - get current memory bank power state |
| 885 | * @pwrdm: struct powerdomain * to get current memory bank power state |
| 886 | * @bank: memory bank number (0-3) |
| 887 | * |
| 888 | * Return the powerdomain pwrdm's current memory power state for bank |
| 889 | * x. Returns -EINVAL if the powerdomain pointer is null, -EEXIST if |
| 890 | * the target memory bank does not exist or is not controllable, or |
| 891 | * returns the current memory power state upon success. |
| 892 | */ |
| 893 | int pwrdm_read_mem_pwrst(struct powerdomain *pwrdm, u8 bank) |
| 894 | { |
| 895 | u32 m; |
| 896 | |
| 897 | if (!pwrdm) |
| 898 | return -EINVAL; |
| 899 | |
| 900 | if (pwrdm->banks < (bank + 1)) |
| 901 | return -EEXIST; |
| 902 | |
| 903 | /* |
| 904 | * The register bit names below may not correspond to the |
| 905 | * actual names of the bits in each powerdomain's register, |
| 906 | * but the type of value returned is the same for each |
| 907 | * powerdomain. |
| 908 | */ |
| 909 | switch (bank) { |
| 910 | case 0: |
| 911 | m = OMAP3430_SHAREDL1CACHEFLATSTATEST_MASK; |
| 912 | break; |
| 913 | case 1: |
| 914 | m = OMAP3430_L1FLATMEMSTATEST_MASK; |
| 915 | break; |
| 916 | case 2: |
| 917 | m = OMAP3430_SHAREDL2CACHEFLATSTATEST_MASK; |
| 918 | break; |
| 919 | case 3: |
| 920 | m = OMAP3430_L2FLATMEMSTATEST_MASK; |
| 921 | break; |
| 922 | default: |
| 923 | WARN_ON(1); /* should never happen */ |
| 924 | return -EEXIST; |
| 925 | } |
| 926 | |
| 927 | return prm_read_mod_bits_shift(pwrdm->prcm_offs, PM_PWSTST, m); |
| 928 | } |
| 929 | |
| 930 | /** |
| 931 | * pwrdm_read_prev_mem_pwrst - get previous memory bank power state |
| 932 | * @pwrdm: struct powerdomain * to get previous memory bank power state |
| 933 | * @bank: memory bank number (0-3) |
| 934 | * |
| 935 | * Return the powerdomain pwrdm's previous memory power state for bank |
| 936 | * x. Returns -EINVAL if the powerdomain pointer is null, -EEXIST if |
| 937 | * the target memory bank does not exist or is not controllable, or |
| 938 | * returns the previous memory power state upon success. |
| 939 | */ |
| 940 | int pwrdm_read_prev_mem_pwrst(struct powerdomain *pwrdm, u8 bank) |
| 941 | { |
| 942 | u32 m; |
| 943 | |
| 944 | if (!pwrdm) |
| 945 | return -EINVAL; |
| 946 | |
| 947 | if (pwrdm->banks < (bank + 1)) |
| 948 | return -EEXIST; |
| 949 | |
| 950 | /* |
| 951 | * The register bit names below may not correspond to the |
| 952 | * actual names of the bits in each powerdomain's register, |
| 953 | * but the type of value returned is the same for each |
| 954 | * powerdomain. |
| 955 | */ |
| 956 | switch (bank) { |
| 957 | case 0: |
| 958 | m = OMAP3430_LASTMEM1STATEENTERED_MASK; |
| 959 | break; |
| 960 | case 1: |
| 961 | m = OMAP3430_LASTMEM2STATEENTERED_MASK; |
| 962 | break; |
| 963 | case 2: |
| 964 | m = OMAP3430_LASTSHAREDL2CACHEFLATSTATEENTERED_MASK; |
| 965 | break; |
| 966 | case 3: |
| 967 | m = OMAP3430_LASTL2FLATMEMSTATEENTERED_MASK; |
| 968 | break; |
| 969 | default: |
| 970 | WARN_ON(1); /* should never happen */ |
| 971 | return -EEXIST; |
| 972 | } |
| 973 | |
| 974 | return prm_read_mod_bits_shift(pwrdm->prcm_offs, |
| 975 | OMAP3430_PM_PREPWSTST, m); |
| 976 | } |
| 977 | |
| 978 | /** |
| 979 | * pwrdm_clear_all_prev_pwrst - clear previous powerstate register for a pwrdm |
| 980 | * @pwrdm: struct powerdomain * to clear |
| 981 | * |
| 982 | * Clear the powerdomain's previous power state register. Clears the |
| 983 | * entire register, including logic and memory bank previous power states. |
| 984 | * Returns -EINVAL if the powerdomain pointer is null, or returns 0 upon |
| 985 | * success. |
| 986 | */ |
| 987 | int pwrdm_clear_all_prev_pwrst(struct powerdomain *pwrdm) |
| 988 | { |
| 989 | if (!pwrdm) |
| 990 | return -EINVAL; |
| 991 | |
| 992 | /* |
| 993 | * XXX should get the powerdomain's current state here; |
| 994 | * warn & fail if it is not ON. |
| 995 | */ |
| 996 | |
| 997 | pr_debug("powerdomain: clearing previous power state reg for %s\n", |
| 998 | pwrdm->name); |
| 999 | |
| 1000 | prm_write_mod_reg(0, pwrdm->prcm_offs, OMAP3430_PM_PREPWSTST); |
| 1001 | |
| 1002 | return 0; |
| 1003 | } |
| 1004 | |
| 1005 | /** |
Paul Walmsley | 0b7cbfb | 2008-06-25 18:09:37 -0600 | [diff] [blame] | 1006 | * pwrdm_enable_hdwr_sar - enable automatic hardware SAR for a pwrdm |
| 1007 | * @pwrdm: struct powerdomain * |
| 1008 | * |
| 1009 | * Enable automatic context save-and-restore upon power state change |
| 1010 | * for some devices in a powerdomain. Warning: this only affects a |
| 1011 | * subset of devices in a powerdomain; check the TRM closely. Returns |
| 1012 | * -EINVAL if the powerdomain pointer is null or if the powerdomain |
| 1013 | * does not support automatic save-and-restore, or returns 0 upon |
| 1014 | * success. |
| 1015 | */ |
| 1016 | int pwrdm_enable_hdwr_sar(struct powerdomain *pwrdm) |
| 1017 | { |
| 1018 | if (!pwrdm) |
| 1019 | return -EINVAL; |
| 1020 | |
| 1021 | if (!(pwrdm->flags & PWRDM_HAS_HDWR_SAR)) |
| 1022 | return -EINVAL; |
| 1023 | |
| 1024 | pr_debug("powerdomain: %s: setting SAVEANDRESTORE bit\n", |
| 1025 | pwrdm->name); |
| 1026 | |
| 1027 | prm_rmw_mod_reg_bits(0, 1 << OMAP3430ES2_SAVEANDRESTORE_SHIFT, |
| 1028 | pwrdm->prcm_offs, PM_PWSTCTRL); |
| 1029 | |
| 1030 | return 0; |
| 1031 | } |
| 1032 | |
| 1033 | /** |
| 1034 | * pwrdm_disable_hdwr_sar - disable automatic hardware SAR for a pwrdm |
| 1035 | * @pwrdm: struct powerdomain * |
| 1036 | * |
| 1037 | * Disable automatic context save-and-restore upon power state change |
| 1038 | * for some devices in a powerdomain. Warning: this only affects a |
| 1039 | * subset of devices in a powerdomain; check the TRM closely. Returns |
| 1040 | * -EINVAL if the powerdomain pointer is null or if the powerdomain |
| 1041 | * does not support automatic save-and-restore, or returns 0 upon |
| 1042 | * success. |
| 1043 | */ |
| 1044 | int pwrdm_disable_hdwr_sar(struct powerdomain *pwrdm) |
| 1045 | { |
| 1046 | if (!pwrdm) |
| 1047 | return -EINVAL; |
| 1048 | |
| 1049 | if (!(pwrdm->flags & PWRDM_HAS_HDWR_SAR)) |
| 1050 | return -EINVAL; |
| 1051 | |
| 1052 | pr_debug("powerdomain: %s: clearing SAVEANDRESTORE bit\n", |
| 1053 | pwrdm->name); |
| 1054 | |
| 1055 | prm_rmw_mod_reg_bits(1 << OMAP3430ES2_SAVEANDRESTORE_SHIFT, 0, |
| 1056 | pwrdm->prcm_offs, PM_PWSTCTRL); |
| 1057 | |
| 1058 | return 0; |
| 1059 | } |
| 1060 | |
| 1061 | /** |
| 1062 | * pwrdm_has_hdwr_sar - test whether powerdomain supports hardware SAR |
| 1063 | * @pwrdm: struct powerdomain * |
| 1064 | * |
| 1065 | * Returns 1 if powerdomain 'pwrdm' supports hardware save-and-restore |
| 1066 | * for some devices, or 0 if it does not. |
| 1067 | */ |
| 1068 | bool pwrdm_has_hdwr_sar(struct powerdomain *pwrdm) |
| 1069 | { |
| 1070 | return (pwrdm && pwrdm->flags & PWRDM_HAS_HDWR_SAR) ? 1 : 0; |
| 1071 | } |
| 1072 | |
| 1073 | /** |
Paul Walmsley | ad67ef6 | 2008-08-19 11:08:40 +0300 | [diff] [blame] | 1074 | * pwrdm_wait_transition - wait for powerdomain power transition to finish |
| 1075 | * @pwrdm: struct powerdomain * to wait for |
| 1076 | * |
| 1077 | * If the powerdomain pwrdm is in the process of a state transition, |
| 1078 | * spin until it completes the power transition, or until an iteration |
| 1079 | * bailout value is reached. Returns -EINVAL if the powerdomain |
| 1080 | * pointer is null, -EAGAIN if the bailout value was reached, or |
| 1081 | * returns 0 upon success. |
| 1082 | */ |
| 1083 | int pwrdm_wait_transition(struct powerdomain *pwrdm) |
| 1084 | { |
| 1085 | u32 c = 0; |
| 1086 | |
| 1087 | if (!pwrdm) |
| 1088 | return -EINVAL; |
| 1089 | |
| 1090 | /* |
| 1091 | * REVISIT: pwrdm_wait_transition() may be better implemented |
| 1092 | * via a callback and a periodic timer check -- how long do we expect |
| 1093 | * powerdomain transitions to take? |
| 1094 | */ |
| 1095 | |
| 1096 | /* XXX Is this udelay() value meaningful? */ |
| 1097 | while ((prm_read_mod_reg(pwrdm->prcm_offs, PM_PWSTST) & |
| 1098 | OMAP_INTRANSITION) && |
| 1099 | (c++ < PWRDM_TRANSITION_BAILOUT)) |
| 1100 | udelay(1); |
| 1101 | |
Roel Kluin | 2687069 | 2009-06-19 19:08:30 -0600 | [diff] [blame] | 1102 | if (c > PWRDM_TRANSITION_BAILOUT) { |
Paul Walmsley | ad67ef6 | 2008-08-19 11:08:40 +0300 | [diff] [blame] | 1103 | printk(KERN_ERR "powerdomain: waited too long for " |
| 1104 | "powerdomain %s to complete transition\n", pwrdm->name); |
| 1105 | return -EAGAIN; |
| 1106 | } |
| 1107 | |
| 1108 | pr_debug("powerdomain: completed transition in %d loops\n", c); |
| 1109 | |
| 1110 | return 0; |
| 1111 | } |
| 1112 | |
| 1113 | |