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b04b65ab PW |
1 | /* |
2 | * omap_device implementation | |
3 | * | |
4 | * Copyright (C) 2009 Nokia Corporation | |
5 | * Paul Walmsley | |
6 | * | |
7 | * Developed in collaboration with (alphabetical order): Benoit | |
8 | * Cousson, Kevin Hilman, Tony Lindgren, Rajendra Nayak, Vikram | |
9 | * Pandita, Sakari Poussa, Anand Sawant, Santosh Shilimkar, Richard | |
10 | * Woodruff | |
11 | * | |
12 | * This program is free software; you can redistribute it and/or modify | |
13 | * it under the terms of the GNU General Public License version 2 as | |
14 | * published by the Free Software Foundation. | |
15 | * | |
16 | * This code provides a consistent interface for OMAP device drivers | |
17 | * to control power management and interconnect properties of their | |
18 | * devices. | |
19 | * | |
20 | * In the medium- to long-term, this code should either be | |
21 | * a) implemented via arch-specific pointers in platform_data | |
22 | * or | |
23 | * b) implemented as a proper omap_bus/omap_device in Linux, no more | |
24 | * platform_data func pointers | |
25 | * | |
26 | * | |
27 | * Guidelines for usage by driver authors: | |
28 | * | |
29 | * 1. These functions are intended to be used by device drivers via | |
30 | * function pointers in struct platform_data. As an example, | |
31 | * omap_device_enable() should be passed to the driver as | |
32 | * | |
33 | * struct foo_driver_platform_data { | |
34 | * ... | |
35 | * int (*device_enable)(struct platform_device *pdev); | |
36 | * ... | |
37 | * } | |
38 | * | |
39 | * Note that the generic "device_enable" name is used, rather than | |
40 | * "omap_device_enable". This is so other architectures can pass in their | |
41 | * own enable/disable functions here. | |
42 | * | |
43 | * This should be populated during device setup: | |
44 | * | |
45 | * ... | |
46 | * pdata->device_enable = omap_device_enable; | |
47 | * ... | |
48 | * | |
49 | * 2. Drivers should first check to ensure the function pointer is not null | |
50 | * before calling it, as in: | |
51 | * | |
52 | * if (pdata->device_enable) | |
53 | * pdata->device_enable(pdev); | |
54 | * | |
55 | * This allows other architectures that don't use similar device_enable()/ | |
56 | * device_shutdown() functions to execute normally. | |
57 | * | |
58 | * ... | |
59 | * | |
60 | * Suggested usage by device drivers: | |
61 | * | |
62 | * During device initialization: | |
63 | * device_enable() | |
64 | * | |
65 | * During device idle: | |
66 | * (save remaining device context if necessary) | |
67 | * device_idle(); | |
68 | * | |
69 | * During device resume: | |
70 | * device_enable(); | |
71 | * (restore context if necessary) | |
72 | * | |
73 | * During device shutdown: | |
74 | * device_shutdown() | |
75 | * (device must be reinitialized at this point to use it again) | |
76 | * | |
77 | */ | |
78 | #undef DEBUG | |
79 | ||
80 | #include <linux/kernel.h> | |
81 | #include <linux/platform_device.h> | |
82 | #include <linux/err.h> | |
83 | #include <linux/io.h> | |
84 | ||
ce491cf8 TL |
85 | #include <plat/omap_device.h> |
86 | #include <plat/omap_hwmod.h> | |
b04b65ab PW |
87 | |
88 | /* These parameters are passed to _omap_device_{de,}activate() */ | |
89 | #define USE_WAKEUP_LAT 0 | |
90 | #define IGNORE_WAKEUP_LAT 1 | |
91 | ||
92 | /* XXX this should be moved into a separate file */ | |
93 | #if defined(CONFIG_ARCH_OMAP2420) | |
94 | # define OMAP_32KSYNCT_BASE 0x48004000 | |
95 | #elif defined(CONFIG_ARCH_OMAP2430) | |
96 | # define OMAP_32KSYNCT_BASE 0x49020000 | |
97 | #elif defined(CONFIG_ARCH_OMAP3430) | |
98 | # define OMAP_32KSYNCT_BASE 0x48320000 | |
99 | #else | |
100 | # error Unknown OMAP device | |
101 | #endif | |
102 | ||
103 | /* Private functions */ | |
104 | ||
b04b65ab PW |
105 | /** |
106 | * _omap_device_activate - increase device readiness | |
107 | * @od: struct omap_device * | |
108 | * @ignore_lat: increase to latency target (0) or full readiness (1)? | |
109 | * | |
110 | * Increase readiness of omap_device @od (thus decreasing device | |
111 | * wakeup latency, but consuming more power). If @ignore_lat is | |
112 | * IGNORE_WAKEUP_LAT, make the omap_device fully active. Otherwise, | |
113 | * if @ignore_lat is USE_WAKEUP_LAT, and the device's maximum wakeup | |
114 | * latency is greater than the requested maximum wakeup latency, step | |
115 | * backwards in the omap_device_pm_latency table to ensure the | |
116 | * device's maximum wakeup latency is less than or equal to the | |
117 | * requested maximum wakeup latency. Returns 0. | |
118 | */ | |
119 | static int _omap_device_activate(struct omap_device *od, u8 ignore_lat) | |
120 | { | |
f059429e | 121 | struct timespec a, b, c; |
b04b65ab PW |
122 | |
123 | pr_debug("omap_device: %s: activating\n", od->pdev.name); | |
124 | ||
125 | while (od->pm_lat_level > 0) { | |
126 | struct omap_device_pm_latency *odpl; | |
f059429e | 127 | unsigned long long act_lat = 0; |
b04b65ab PW |
128 | |
129 | od->pm_lat_level--; | |
130 | ||
131 | odpl = od->pm_lats + od->pm_lat_level; | |
132 | ||
133 | if (!ignore_lat && | |
134 | (od->dev_wakeup_lat <= od->_dev_wakeup_lat_limit)) | |
135 | break; | |
136 | ||
f059429e | 137 | getnstimeofday(&a); |
b04b65ab PW |
138 | |
139 | /* XXX check return code */ | |
140 | odpl->activate_func(od); | |
141 | ||
f059429e | 142 | getnstimeofday(&b); |
b04b65ab | 143 | |
f059429e TL |
144 | c = timespec_sub(b, a); |
145 | act_lat = timespec_to_ns(&c) * NSEC_PER_USEC; | |
b04b65ab PW |
146 | |
147 | pr_debug("omap_device: %s: pm_lat %d: activate: elapsed time " | |
f059429e TL |
148 | "%llu usec\n", od->pdev.name, od->pm_lat_level, |
149 | act_lat); | |
b04b65ab PW |
150 | |
151 | WARN(act_lat > odpl->activate_lat, "omap_device: %s.%d: " | |
f059429e | 152 | "activate step %d took longer than expected (%llu > %d)\n", |
b04b65ab PW |
153 | od->pdev.name, od->pdev.id, od->pm_lat_level, |
154 | act_lat, odpl->activate_lat); | |
155 | ||
156 | od->dev_wakeup_lat -= odpl->activate_lat; | |
157 | } | |
158 | ||
159 | return 0; | |
160 | } | |
161 | ||
162 | /** | |
163 | * _omap_device_deactivate - decrease device readiness | |
164 | * @od: struct omap_device * | |
165 | * @ignore_lat: decrease to latency target (0) or full inactivity (1)? | |
166 | * | |
167 | * Decrease readiness of omap_device @od (thus increasing device | |
168 | * wakeup latency, but conserving power). If @ignore_lat is | |
169 | * IGNORE_WAKEUP_LAT, make the omap_device fully inactive. Otherwise, | |
170 | * if @ignore_lat is USE_WAKEUP_LAT, and the device's maximum wakeup | |
171 | * latency is less than the requested maximum wakeup latency, step | |
172 | * forwards in the omap_device_pm_latency table to ensure the device's | |
173 | * maximum wakeup latency is less than or equal to the requested | |
174 | * maximum wakeup latency. Returns 0. | |
175 | */ | |
176 | static int _omap_device_deactivate(struct omap_device *od, u8 ignore_lat) | |
177 | { | |
f059429e | 178 | struct timespec a, b, c; |
b04b65ab PW |
179 | |
180 | pr_debug("omap_device: %s: deactivating\n", od->pdev.name); | |
181 | ||
182 | while (od->pm_lat_level < od->pm_lats_cnt) { | |
183 | struct omap_device_pm_latency *odpl; | |
f059429e | 184 | unsigned long long deact_lat = 0; |
b04b65ab PW |
185 | |
186 | odpl = od->pm_lats + od->pm_lat_level; | |
187 | ||
188 | if (!ignore_lat && | |
189 | ((od->dev_wakeup_lat + odpl->activate_lat) > | |
190 | od->_dev_wakeup_lat_limit)) | |
191 | break; | |
192 | ||
f059429e | 193 | getnstimeofday(&a); |
b04b65ab PW |
194 | |
195 | /* XXX check return code */ | |
196 | odpl->deactivate_func(od); | |
197 | ||
f059429e | 198 | getnstimeofday(&b); |
b04b65ab | 199 | |
f059429e TL |
200 | c = timespec_sub(b, a); |
201 | deact_lat = timespec_to_ns(&c) * NSEC_PER_USEC; | |
b04b65ab PW |
202 | |
203 | pr_debug("omap_device: %s: pm_lat %d: deactivate: elapsed time " | |
f059429e | 204 | "%llu usec\n", od->pdev.name, od->pm_lat_level, |
b04b65ab PW |
205 | deact_lat); |
206 | ||
207 | WARN(deact_lat > odpl->deactivate_lat, "omap_device: %s.%d: " | |
f059429e TL |
208 | "deactivate step %d took longer than expected " |
209 | "(%llu > %d)\n", od->pdev.name, od->pdev.id, | |
210 | od->pm_lat_level, deact_lat, odpl->deactivate_lat); | |
b04b65ab PW |
211 | |
212 | od->dev_wakeup_lat += odpl->activate_lat; | |
213 | ||
214 | od->pm_lat_level++; | |
215 | } | |
216 | ||
217 | return 0; | |
218 | } | |
219 | ||
220 | static inline struct omap_device *_find_by_pdev(struct platform_device *pdev) | |
221 | { | |
222 | return container_of(pdev, struct omap_device, pdev); | |
223 | } | |
224 | ||
225 | ||
226 | /* Public functions for use by core code */ | |
227 | ||
228 | /** | |
229 | * omap_device_count_resources - count number of struct resource entries needed | |
230 | * @od: struct omap_device * | |
231 | * | |
232 | * Count the number of struct resource entries needed for this | |
233 | * omap_device @od. Used by omap_device_build_ss() to determine how | |
234 | * much memory to allocate before calling | |
235 | * omap_device_fill_resources(). Returns the count. | |
236 | */ | |
237 | int omap_device_count_resources(struct omap_device *od) | |
238 | { | |
239 | struct omap_hwmod *oh; | |
240 | int c = 0; | |
241 | int i; | |
242 | ||
243 | for (i = 0, oh = *od->hwmods; i < od->hwmods_cnt; i++, oh++) | |
244 | c += omap_hwmod_count_resources(oh); | |
245 | ||
246 | pr_debug("omap_device: %s: counted %d total resources across %d " | |
247 | "hwmods\n", od->pdev.name, c, od->hwmods_cnt); | |
248 | ||
249 | return c; | |
250 | } | |
251 | ||
252 | /** | |
253 | * omap_device_fill_resources - fill in array of struct resource | |
254 | * @od: struct omap_device * | |
255 | * @res: pointer to an array of struct resource to be filled in | |
256 | * | |
257 | * Populate one or more empty struct resource pointed to by @res with | |
258 | * the resource data for this omap_device @od. Used by | |
259 | * omap_device_build_ss() after calling omap_device_count_resources(). | |
260 | * Ideally this function would not be needed at all. If omap_device | |
261 | * replaces platform_device, then we can specify our own | |
262 | * get_resource()/ get_irq()/etc functions that use the underlying | |
263 | * omap_hwmod information. Or if platform_device is extended to use | |
264 | * subarchitecture-specific function pointers, the various | |
265 | * platform_device functions can simply call omap_device internal | |
266 | * functions to get device resources. Hacking around the existing | |
267 | * platform_device code wastes memory. Returns 0. | |
268 | */ | |
269 | int omap_device_fill_resources(struct omap_device *od, struct resource *res) | |
270 | { | |
271 | struct omap_hwmod *oh; | |
272 | int c = 0; | |
273 | int i, r; | |
274 | ||
275 | for (i = 0, oh = *od->hwmods; i < od->hwmods_cnt; i++, oh++) { | |
276 | r = omap_hwmod_fill_resources(oh, res); | |
277 | res += r; | |
278 | c += r; | |
279 | } | |
280 | ||
281 | return 0; | |
282 | } | |
283 | ||
284 | /** | |
285 | * omap_device_build - build and register an omap_device with one omap_hwmod | |
286 | * @pdev_name: name of the platform_device driver to use | |
287 | * @pdev_id: this platform_device's connection ID | |
288 | * @oh: ptr to the single omap_hwmod that backs this omap_device | |
289 | * @pdata: platform_data ptr to associate with the platform_device | |
290 | * @pdata_len: amount of memory pointed to by @pdata | |
291 | * @pm_lats: pointer to a omap_device_pm_latency array for this device | |
292 | * @pm_lats_cnt: ARRAY_SIZE() of @pm_lats | |
293 | * | |
294 | * Convenience function for building and registering a single | |
295 | * omap_device record, which in turn builds and registers a | |
296 | * platform_device record. See omap_device_build_ss() for more | |
297 | * information. Returns ERR_PTR(-EINVAL) if @oh is NULL; otherwise, | |
298 | * passes along the return value of omap_device_build_ss(). | |
299 | */ | |
300 | struct omap_device *omap_device_build(const char *pdev_name, int pdev_id, | |
301 | struct omap_hwmod *oh, void *pdata, | |
302 | int pdata_len, | |
303 | struct omap_device_pm_latency *pm_lats, | |
304 | int pm_lats_cnt) | |
305 | { | |
306 | struct omap_hwmod *ohs[] = { oh }; | |
307 | ||
308 | if (!oh) | |
309 | return ERR_PTR(-EINVAL); | |
310 | ||
311 | return omap_device_build_ss(pdev_name, pdev_id, ohs, 1, pdata, | |
312 | pdata_len, pm_lats, pm_lats_cnt); | |
313 | } | |
314 | ||
315 | /** | |
316 | * omap_device_build_ss - build and register an omap_device with multiple hwmods | |
317 | * @pdev_name: name of the platform_device driver to use | |
318 | * @pdev_id: this platform_device's connection ID | |
319 | * @oh: ptr to the single omap_hwmod that backs this omap_device | |
320 | * @pdata: platform_data ptr to associate with the platform_device | |
321 | * @pdata_len: amount of memory pointed to by @pdata | |
322 | * @pm_lats: pointer to a omap_device_pm_latency array for this device | |
323 | * @pm_lats_cnt: ARRAY_SIZE() of @pm_lats | |
324 | * | |
325 | * Convenience function for building and registering an omap_device | |
326 | * subsystem record. Subsystem records consist of multiple | |
327 | * omap_hwmods. This function in turn builds and registers a | |
328 | * platform_device record. Returns an ERR_PTR() on error, or passes | |
329 | * along the return value of omap_device_register(). | |
330 | */ | |
331 | struct omap_device *omap_device_build_ss(const char *pdev_name, int pdev_id, | |
332 | struct omap_hwmod **ohs, int oh_cnt, | |
333 | void *pdata, int pdata_len, | |
334 | struct omap_device_pm_latency *pm_lats, | |
335 | int pm_lats_cnt) | |
336 | { | |
337 | int ret = -ENOMEM; | |
338 | struct omap_device *od; | |
339 | char *pdev_name2; | |
340 | struct resource *res = NULL; | |
341 | int res_count; | |
342 | struct omap_hwmod **hwmods; | |
343 | ||
344 | if (!ohs || oh_cnt == 0 || !pdev_name) | |
345 | return ERR_PTR(-EINVAL); | |
346 | ||
347 | if (!pdata && pdata_len > 0) | |
348 | return ERR_PTR(-EINVAL); | |
349 | ||
350 | pr_debug("omap_device: %s: building with %d hwmods\n", pdev_name, | |
351 | oh_cnt); | |
352 | ||
353 | od = kzalloc(sizeof(struct omap_device), GFP_KERNEL); | |
354 | if (!od) | |
355 | return ERR_PTR(-ENOMEM); | |
356 | ||
357 | od->hwmods_cnt = oh_cnt; | |
358 | ||
359 | hwmods = kzalloc(sizeof(struct omap_hwmod *) * oh_cnt, | |
360 | GFP_KERNEL); | |
361 | if (!hwmods) | |
362 | goto odbs_exit1; | |
363 | ||
364 | memcpy(hwmods, ohs, sizeof(struct omap_hwmod *) * oh_cnt); | |
365 | od->hwmods = hwmods; | |
366 | ||
367 | pdev_name2 = kzalloc(strlen(pdev_name) + 1, GFP_KERNEL); | |
368 | if (!pdev_name2) | |
369 | goto odbs_exit2; | |
370 | strcpy(pdev_name2, pdev_name); | |
371 | ||
372 | od->pdev.name = pdev_name2; | |
373 | od->pdev.id = pdev_id; | |
374 | ||
375 | res_count = omap_device_count_resources(od); | |
376 | if (res_count > 0) { | |
377 | res = kzalloc(sizeof(struct resource) * res_count, GFP_KERNEL); | |
378 | if (!res) | |
379 | goto odbs_exit3; | |
380 | } | |
381 | omap_device_fill_resources(od, res); | |
382 | ||
383 | od->pdev.num_resources = res_count; | |
384 | od->pdev.resource = res; | |
385 | ||
386 | platform_device_add_data(&od->pdev, pdata, pdata_len); | |
387 | ||
388 | od->pm_lats = pm_lats; | |
389 | od->pm_lats_cnt = pm_lats_cnt; | |
390 | ||
391 | ret = omap_device_register(od); | |
392 | if (ret) | |
393 | goto odbs_exit4; | |
394 | ||
395 | return od; | |
396 | ||
397 | odbs_exit4: | |
398 | kfree(res); | |
399 | odbs_exit3: | |
400 | kfree(pdev_name2); | |
401 | odbs_exit2: | |
402 | kfree(hwmods); | |
403 | odbs_exit1: | |
404 | kfree(od); | |
405 | ||
406 | pr_err("omap_device: %s: build failed (%d)\n", pdev_name, ret); | |
407 | ||
408 | return ERR_PTR(ret); | |
409 | } | |
410 | ||
411 | /** | |
412 | * omap_device_register - register an omap_device with one omap_hwmod | |
413 | * @od: struct omap_device * to register | |
414 | * | |
415 | * Register the omap_device structure. This currently just calls | |
416 | * platform_device_register() on the underlying platform_device. | |
417 | * Returns the return value of platform_device_register(). | |
418 | */ | |
419 | int omap_device_register(struct omap_device *od) | |
420 | { | |
421 | pr_debug("omap_device: %s: registering\n", od->pdev.name); | |
422 | ||
423 | return platform_device_register(&od->pdev); | |
424 | } | |
425 | ||
426 | ||
427 | /* Public functions for use by device drivers through struct platform_data */ | |
428 | ||
429 | /** | |
430 | * omap_device_enable - fully activate an omap_device | |
431 | * @od: struct omap_device * to activate | |
432 | * | |
433 | * Do whatever is necessary for the hwmods underlying omap_device @od | |
434 | * to be accessible and ready to operate. This generally involves | |
435 | * enabling clocks, setting SYSCONFIG registers; and in the future may | |
436 | * involve remuxing pins. Device drivers should call this function | |
437 | * (through platform_data function pointers) where they would normally | |
438 | * enable clocks, etc. Returns -EINVAL if called when the omap_device | |
439 | * is already enabled, or passes along the return value of | |
440 | * _omap_device_activate(). | |
441 | */ | |
442 | int omap_device_enable(struct platform_device *pdev) | |
443 | { | |
444 | int ret; | |
445 | struct omap_device *od; | |
446 | ||
447 | od = _find_by_pdev(pdev); | |
448 | ||
449 | if (od->_state == OMAP_DEVICE_STATE_ENABLED) { | |
450 | WARN(1, "omap_device: %s.%d: omap_device_enable() called from " | |
451 | "invalid state\n", od->pdev.name, od->pdev.id); | |
452 | return -EINVAL; | |
453 | } | |
454 | ||
455 | /* Enable everything if we're enabling this device from scratch */ | |
456 | if (od->_state == OMAP_DEVICE_STATE_UNKNOWN) | |
457 | od->pm_lat_level = od->pm_lats_cnt; | |
458 | ||
459 | ret = _omap_device_activate(od, IGNORE_WAKEUP_LAT); | |
460 | ||
461 | od->dev_wakeup_lat = 0; | |
5f1b6ef7 | 462 | od->_dev_wakeup_lat_limit = UINT_MAX; |
b04b65ab PW |
463 | od->_state = OMAP_DEVICE_STATE_ENABLED; |
464 | ||
465 | return ret; | |
466 | } | |
467 | ||
468 | /** | |
469 | * omap_device_idle - idle an omap_device | |
470 | * @od: struct omap_device * to idle | |
471 | * | |
472 | * Idle omap_device @od by calling as many .deactivate_func() entries | |
473 | * in the omap_device's pm_lats table as is possible without exceeding | |
474 | * the device's maximum wakeup latency limit, pm_lat_limit. Device | |
475 | * drivers should call this function (through platform_data function | |
476 | * pointers) where they would normally disable clocks after operations | |
477 | * complete, etc.. Returns -EINVAL if the omap_device is not | |
478 | * currently enabled, or passes along the return value of | |
479 | * _omap_device_deactivate(). | |
480 | */ | |
481 | int omap_device_idle(struct platform_device *pdev) | |
482 | { | |
483 | int ret; | |
484 | struct omap_device *od; | |
485 | ||
486 | od = _find_by_pdev(pdev); | |
487 | ||
488 | if (od->_state != OMAP_DEVICE_STATE_ENABLED) { | |
489 | WARN(1, "omap_device: %s.%d: omap_device_idle() called from " | |
490 | "invalid state\n", od->pdev.name, od->pdev.id); | |
491 | return -EINVAL; | |
492 | } | |
493 | ||
494 | ret = _omap_device_deactivate(od, USE_WAKEUP_LAT); | |
495 | ||
496 | od->_state = OMAP_DEVICE_STATE_IDLE; | |
497 | ||
498 | return ret; | |
499 | } | |
500 | ||
501 | /** | |
502 | * omap_device_shutdown - shut down an omap_device | |
503 | * @od: struct omap_device * to shut down | |
504 | * | |
505 | * Shut down omap_device @od by calling all .deactivate_func() entries | |
506 | * in the omap_device's pm_lats table and then shutting down all of | |
507 | * the underlying omap_hwmods. Used when a device is being "removed" | |
508 | * or a device driver is being unloaded. Returns -EINVAL if the | |
509 | * omap_device is not currently enabled or idle, or passes along the | |
510 | * return value of _omap_device_deactivate(). | |
511 | */ | |
512 | int omap_device_shutdown(struct platform_device *pdev) | |
513 | { | |
514 | int ret, i; | |
515 | struct omap_device *od; | |
516 | struct omap_hwmod *oh; | |
517 | ||
518 | od = _find_by_pdev(pdev); | |
519 | ||
520 | if (od->_state != OMAP_DEVICE_STATE_ENABLED && | |
521 | od->_state != OMAP_DEVICE_STATE_IDLE) { | |
522 | WARN(1, "omap_device: %s.%d: omap_device_shutdown() called " | |
523 | "from invalid state\n", od->pdev.name, od->pdev.id); | |
524 | return -EINVAL; | |
525 | } | |
526 | ||
527 | ret = _omap_device_deactivate(od, IGNORE_WAKEUP_LAT); | |
528 | ||
529 | for (i = 0, oh = *od->hwmods; i < od->hwmods_cnt; i++, oh++) | |
530 | omap_hwmod_shutdown(oh); | |
531 | ||
532 | od->_state = OMAP_DEVICE_STATE_SHUTDOWN; | |
533 | ||
534 | return ret; | |
535 | } | |
536 | ||
537 | /** | |
538 | * omap_device_align_pm_lat - activate/deactivate device to match wakeup lat lim | |
539 | * @od: struct omap_device * | |
540 | * | |
541 | * When a device's maximum wakeup latency limit changes, call some of | |
542 | * the .activate_func or .deactivate_func function pointers in the | |
543 | * omap_device's pm_lats array to ensure that the device's maximum | |
544 | * wakeup latency is less than or equal to the new latency limit. | |
545 | * Intended to be called by OMAP PM code whenever a device's maximum | |
546 | * wakeup latency limit changes (e.g., via | |
547 | * omap_pm_set_dev_wakeup_lat()). Returns 0 if nothing needs to be | |
548 | * done (e.g., if the omap_device is not currently idle, or if the | |
549 | * wakeup latency is already current with the new limit) or passes | |
550 | * along the return value of _omap_device_deactivate() or | |
551 | * _omap_device_activate(). | |
552 | */ | |
553 | int omap_device_align_pm_lat(struct platform_device *pdev, | |
554 | u32 new_wakeup_lat_limit) | |
555 | { | |
556 | int ret = -EINVAL; | |
557 | struct omap_device *od; | |
558 | ||
559 | od = _find_by_pdev(pdev); | |
560 | ||
561 | if (new_wakeup_lat_limit == od->dev_wakeup_lat) | |
562 | return 0; | |
563 | ||
564 | od->_dev_wakeup_lat_limit = new_wakeup_lat_limit; | |
565 | ||
566 | if (od->_state != OMAP_DEVICE_STATE_IDLE) | |
567 | return 0; | |
568 | else if (new_wakeup_lat_limit > od->dev_wakeup_lat) | |
569 | ret = _omap_device_deactivate(od, USE_WAKEUP_LAT); | |
570 | else if (new_wakeup_lat_limit < od->dev_wakeup_lat) | |
571 | ret = _omap_device_activate(od, USE_WAKEUP_LAT); | |
572 | ||
573 | return ret; | |
574 | } | |
575 | ||
576 | /** | |
577 | * omap_device_get_pwrdm - return the powerdomain * associated with @od | |
578 | * @od: struct omap_device * | |
579 | * | |
580 | * Return the powerdomain associated with the first underlying | |
581 | * omap_hwmod for this omap_device. Intended for use by core OMAP PM | |
582 | * code. Returns NULL on error or a struct powerdomain * upon | |
583 | * success. | |
584 | */ | |
585 | struct powerdomain *omap_device_get_pwrdm(struct omap_device *od) | |
586 | { | |
587 | /* | |
588 | * XXX Assumes that all omap_hwmod powerdomains are identical. | |
589 | * This may not necessarily be true. There should be a sanity | |
590 | * check in here to WARN() if any difference appears. | |
591 | */ | |
592 | if (!od->hwmods_cnt) | |
593 | return NULL; | |
594 | ||
595 | return omap_hwmod_get_pwrdm(od->hwmods[0]); | |
596 | } | |
597 | ||
598 | /* | |
599 | * Public functions intended for use in omap_device_pm_latency | |
600 | * .activate_func and .deactivate_func function pointers | |
601 | */ | |
602 | ||
603 | /** | |
604 | * omap_device_enable_hwmods - call omap_hwmod_enable() on all hwmods | |
605 | * @od: struct omap_device *od | |
606 | * | |
607 | * Enable all underlying hwmods. Returns 0. | |
608 | */ | |
609 | int omap_device_enable_hwmods(struct omap_device *od) | |
610 | { | |
611 | struct omap_hwmod *oh; | |
612 | int i; | |
613 | ||
614 | for (i = 0, oh = *od->hwmods; i < od->hwmods_cnt; i++, oh++) | |
615 | omap_hwmod_enable(oh); | |
616 | ||
617 | /* XXX pass along return value here? */ | |
618 | return 0; | |
619 | } | |
620 | ||
621 | /** | |
622 | * omap_device_idle_hwmods - call omap_hwmod_idle() on all hwmods | |
623 | * @od: struct omap_device *od | |
624 | * | |
625 | * Idle all underlying hwmods. Returns 0. | |
626 | */ | |
627 | int omap_device_idle_hwmods(struct omap_device *od) | |
628 | { | |
629 | struct omap_hwmod *oh; | |
630 | int i; | |
631 | ||
632 | for (i = 0, oh = *od->hwmods; i < od->hwmods_cnt; i++, oh++) | |
633 | omap_hwmod_idle(oh); | |
634 | ||
635 | /* XXX pass along return value here? */ | |
636 | return 0; | |
637 | } | |
638 | ||
639 | /** | |
640 | * omap_device_disable_clocks - disable all main and interface clocks | |
641 | * @od: struct omap_device *od | |
642 | * | |
643 | * Disable the main functional clock and interface clock for all of the | |
644 | * omap_hwmods associated with the omap_device. Returns 0. | |
645 | */ | |
646 | int omap_device_disable_clocks(struct omap_device *od) | |
647 | { | |
648 | struct omap_hwmod *oh; | |
649 | int i; | |
650 | ||
651 | for (i = 0, oh = *od->hwmods; i < od->hwmods_cnt; i++, oh++) | |
652 | omap_hwmod_disable_clocks(oh); | |
653 | ||
654 | /* XXX pass along return value here? */ | |
655 | return 0; | |
656 | } | |
657 | ||
658 | /** | |
659 | * omap_device_enable_clocks - enable all main and interface clocks | |
660 | * @od: struct omap_device *od | |
661 | * | |
662 | * Enable the main functional clock and interface clock for all of the | |
663 | * omap_hwmods associated with the omap_device. Returns 0. | |
664 | */ | |
665 | int omap_device_enable_clocks(struct omap_device *od) | |
666 | { | |
667 | struct omap_hwmod *oh; | |
668 | int i; | |
669 | ||
670 | for (i = 0, oh = *od->hwmods; i < od->hwmods_cnt; i++, oh++) | |
671 | omap_hwmod_enable_clocks(oh); | |
672 | ||
673 | /* XXX pass along return value here? */ | |
674 | return 0; | |
675 | } |