kvm tools, setup: Create private directory
[linux-2.6/next.git] / arch / arm / plat-omap / omap_device.c
blob49fc0df0c21f58be364d6da00e14d73eb8c32344
1 /*
2 * omap_device implementation
4 * Copyright (C) 2009-2010 Nokia Corporation
5 * Paul Walmsley, Kevin Hilman
7 * Developed in collaboration with (alphabetical order): Benoit
8 * Cousson, Thara Gopinath, Tony Lindgren, Rajendra Nayak, Vikram
9 * Pandita, Sakari Poussa, Anand Sawant, Santosh Shilimkar, Richard
10 * Woodruff
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.
16 * This code provides a consistent interface for OMAP device drivers
17 * to control power management and interconnect properties of their
18 * devices.
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
27 * Guidelines for usage by driver authors:
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
33 * struct foo_driver_platform_data {
34 * ...
35 * int (*device_enable)(struct platform_device *pdev);
36 * ...
37 * }
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.
43 * This should be populated during device setup:
45 * ...
46 * pdata->device_enable = omap_device_enable;
47 * ...
49 * 2. Drivers should first check to ensure the function pointer is not null
50 * before calling it, as in:
52 * if (pdata->device_enable)
53 * pdata->device_enable(pdev);
55 * This allows other architectures that don't use similar device_enable()/
56 * device_shutdown() functions to execute normally.
58 * ...
60 * Suggested usage by device drivers:
62 * During device initialization:
63 * device_enable()
65 * During device idle:
66 * (save remaining device context if necessary)
67 * device_idle();
69 * During device resume:
70 * device_enable();
71 * (restore context if necessary)
73 * During device shutdown:
74 * device_shutdown()
75 * (device must be reinitialized at this point to use it again)
78 #undef DEBUG
80 #include <linux/kernel.h>
81 #include <linux/platform_device.h>
82 #include <linux/slab.h>
83 #include <linux/err.h>
84 #include <linux/io.h>
85 #include <linux/clk.h>
86 #include <linux/clkdev.h>
87 #include <linux/pm_runtime.h>
89 #include <plat/omap_device.h>
90 #include <plat/omap_hwmod.h>
91 #include <plat/clock.h>
93 /* These parameters are passed to _omap_device_{de,}activate() */
94 #define USE_WAKEUP_LAT 0
95 #define IGNORE_WAKEUP_LAT 1
97 /* Private functions */
99 /**
100 * _omap_device_activate - increase device readiness
101 * @od: struct omap_device *
102 * @ignore_lat: increase to latency target (0) or full readiness (1)?
104 * Increase readiness of omap_device @od (thus decreasing device
105 * wakeup latency, but consuming more power). If @ignore_lat is
106 * IGNORE_WAKEUP_LAT, make the omap_device fully active. Otherwise,
107 * if @ignore_lat is USE_WAKEUP_LAT, and the device's maximum wakeup
108 * latency is greater than the requested maximum wakeup latency, step
109 * backwards in the omap_device_pm_latency table to ensure the
110 * device's maximum wakeup latency is less than or equal to the
111 * requested maximum wakeup latency. Returns 0.
113 static int _omap_device_activate(struct omap_device *od, u8 ignore_lat)
115 struct timespec a, b, c;
117 pr_debug("omap_device: %s: activating\n", od->pdev.name);
119 while (od->pm_lat_level > 0) {
120 struct omap_device_pm_latency *odpl;
121 unsigned long long act_lat = 0;
123 od->pm_lat_level--;
125 odpl = od->pm_lats + od->pm_lat_level;
127 if (!ignore_lat &&
128 (od->dev_wakeup_lat <= od->_dev_wakeup_lat_limit))
129 break;
131 read_persistent_clock(&a);
133 /* XXX check return code */
134 odpl->activate_func(od);
136 read_persistent_clock(&b);
138 c = timespec_sub(b, a);
139 act_lat = timespec_to_ns(&c);
141 pr_debug("omap_device: %s: pm_lat %d: activate: elapsed time "
142 "%llu nsec\n", od->pdev.name, od->pm_lat_level,
143 act_lat);
145 if (act_lat > odpl->activate_lat) {
146 odpl->activate_lat_worst = act_lat;
147 if (odpl->flags & OMAP_DEVICE_LATENCY_AUTO_ADJUST) {
148 odpl->activate_lat = act_lat;
149 pr_warning("omap_device: %s.%d: new worst case "
150 "activate latency %d: %llu\n",
151 od->pdev.name, od->pdev.id,
152 od->pm_lat_level, act_lat);
153 } else
154 pr_warning("omap_device: %s.%d: activate "
155 "latency %d higher than exptected. "
156 "(%llu > %d)\n",
157 od->pdev.name, od->pdev.id,
158 od->pm_lat_level, act_lat,
159 odpl->activate_lat);
162 od->dev_wakeup_lat -= odpl->activate_lat;
165 return 0;
169 * _omap_device_deactivate - decrease device readiness
170 * @od: struct omap_device *
171 * @ignore_lat: decrease to latency target (0) or full inactivity (1)?
173 * Decrease readiness of omap_device @od (thus increasing device
174 * wakeup latency, but conserving power). If @ignore_lat is
175 * IGNORE_WAKEUP_LAT, make the omap_device fully inactive. Otherwise,
176 * if @ignore_lat is USE_WAKEUP_LAT, and the device's maximum wakeup
177 * latency is less than the requested maximum wakeup latency, step
178 * forwards in the omap_device_pm_latency table to ensure the device's
179 * maximum wakeup latency is less than or equal to the requested
180 * maximum wakeup latency. Returns 0.
182 static int _omap_device_deactivate(struct omap_device *od, u8 ignore_lat)
184 struct timespec a, b, c;
186 pr_debug("omap_device: %s: deactivating\n", od->pdev.name);
188 while (od->pm_lat_level < od->pm_lats_cnt) {
189 struct omap_device_pm_latency *odpl;
190 unsigned long long deact_lat = 0;
192 odpl = od->pm_lats + od->pm_lat_level;
194 if (!ignore_lat &&
195 ((od->dev_wakeup_lat + odpl->activate_lat) >
196 od->_dev_wakeup_lat_limit))
197 break;
199 read_persistent_clock(&a);
201 /* XXX check return code */
202 odpl->deactivate_func(od);
204 read_persistent_clock(&b);
206 c = timespec_sub(b, a);
207 deact_lat = timespec_to_ns(&c);
209 pr_debug("omap_device: %s: pm_lat %d: deactivate: elapsed time "
210 "%llu nsec\n", od->pdev.name, od->pm_lat_level,
211 deact_lat);
213 if (deact_lat > odpl->deactivate_lat) {
214 odpl->deactivate_lat_worst = deact_lat;
215 if (odpl->flags & OMAP_DEVICE_LATENCY_AUTO_ADJUST) {
216 odpl->deactivate_lat = deact_lat;
217 pr_warning("omap_device: %s.%d: new worst case "
218 "deactivate latency %d: %llu\n",
219 od->pdev.name, od->pdev.id,
220 od->pm_lat_level, deact_lat);
221 } else
222 pr_warning("omap_device: %s.%d: deactivate "
223 "latency %d higher than exptected. "
224 "(%llu > %d)\n",
225 od->pdev.name, od->pdev.id,
226 od->pm_lat_level, deact_lat,
227 odpl->deactivate_lat);
231 od->dev_wakeup_lat += odpl->activate_lat;
233 od->pm_lat_level++;
236 return 0;
239 static inline struct omap_device *_find_by_pdev(struct platform_device *pdev)
241 return container_of(pdev, struct omap_device, pdev);
245 * _add_optional_clock_clkdev - Add clkdev entry for hwmod optional clocks
246 * @od: struct omap_device *od
248 * For every optional clock present per hwmod per omap_device, this function
249 * adds an entry in the clkdev table of the form <dev-id=dev_name, con-id=role>
250 * if it does not exist already.
252 * The function is called from inside omap_device_build_ss(), after
253 * omap_device_register.
255 * This allows drivers to get a pointer to its optional clocks based on its role
256 * by calling clk_get(<dev*>, <role>).
258 * No return value.
260 static void _add_optional_clock_clkdev(struct omap_device *od,
261 struct omap_hwmod *oh)
263 int i;
265 for (i = 0; i < oh->opt_clks_cnt; i++) {
266 struct omap_hwmod_opt_clk *oc;
267 struct clk *r;
268 struct clk_lookup *l;
270 oc = &oh->opt_clks[i];
272 if (!oc->_clk)
273 continue;
275 r = clk_get_sys(dev_name(&od->pdev.dev), oc->role);
276 if (!IS_ERR(r))
277 continue; /* clkdev entry exists */
279 r = omap_clk_get_by_name((char *)oc->clk);
280 if (IS_ERR(r)) {
281 pr_err("omap_device: %s: omap_clk_get_by_name for %s failed\n",
282 dev_name(&od->pdev.dev), oc->clk);
283 continue;
286 l = clkdev_alloc(r, oc->role, dev_name(&od->pdev.dev));
287 if (!l) {
288 pr_err("omap_device: %s: clkdev_alloc for %s failed\n",
289 dev_name(&od->pdev.dev), oc->role);
290 return;
292 clkdev_add(l);
297 /* Public functions for use by core code */
300 * omap_device_get_context_loss_count - get lost context count
301 * @od: struct omap_device *
303 * Using the primary hwmod, query the context loss count for this
304 * device.
306 * Callers should consider context for this device lost any time this
307 * function returns a value different than the value the caller got
308 * the last time it called this function.
310 * If any hwmods exist for the omap_device assoiated with @pdev,
311 * return the context loss counter for that hwmod, otherwise return
312 * zero.
314 u32 omap_device_get_context_loss_count(struct platform_device *pdev)
316 struct omap_device *od;
317 u32 ret = 0;
319 od = _find_by_pdev(pdev);
321 if (od->hwmods_cnt)
322 ret = omap_hwmod_get_context_loss_count(od->hwmods[0]);
324 return ret;
328 * omap_device_count_resources - count number of struct resource entries needed
329 * @od: struct omap_device *
331 * Count the number of struct resource entries needed for this
332 * omap_device @od. Used by omap_device_build_ss() to determine how
333 * much memory to allocate before calling
334 * omap_device_fill_resources(). Returns the count.
336 int omap_device_count_resources(struct omap_device *od)
338 int c = 0;
339 int i;
341 for (i = 0; i < od->hwmods_cnt; i++)
342 c += omap_hwmod_count_resources(od->hwmods[i]);
344 pr_debug("omap_device: %s: counted %d total resources across %d "
345 "hwmods\n", od->pdev.name, c, od->hwmods_cnt);
347 return c;
351 * omap_device_fill_resources - fill in array of struct resource
352 * @od: struct omap_device *
353 * @res: pointer to an array of struct resource to be filled in
355 * Populate one or more empty struct resource pointed to by @res with
356 * the resource data for this omap_device @od. Used by
357 * omap_device_build_ss() after calling omap_device_count_resources().
358 * Ideally this function would not be needed at all. If omap_device
359 * replaces platform_device, then we can specify our own
360 * get_resource()/ get_irq()/etc functions that use the underlying
361 * omap_hwmod information. Or if platform_device is extended to use
362 * subarchitecture-specific function pointers, the various
363 * platform_device functions can simply call omap_device internal
364 * functions to get device resources. Hacking around the existing
365 * platform_device code wastes memory. Returns 0.
367 int omap_device_fill_resources(struct omap_device *od, struct resource *res)
369 int c = 0;
370 int i, r;
372 for (i = 0; i < od->hwmods_cnt; i++) {
373 r = omap_hwmod_fill_resources(od->hwmods[i], res);
374 res += r;
375 c += r;
378 return 0;
382 * omap_device_build - build and register an omap_device with one omap_hwmod
383 * @pdev_name: name of the platform_device driver to use
384 * @pdev_id: this platform_device's connection ID
385 * @oh: ptr to the single omap_hwmod that backs this omap_device
386 * @pdata: platform_data ptr to associate with the platform_device
387 * @pdata_len: amount of memory pointed to by @pdata
388 * @pm_lats: pointer to a omap_device_pm_latency array for this device
389 * @pm_lats_cnt: ARRAY_SIZE() of @pm_lats
390 * @is_early_device: should the device be registered as an early device or not
392 * Convenience function for building and registering a single
393 * omap_device record, which in turn builds and registers a
394 * platform_device record. See omap_device_build_ss() for more
395 * information. Returns ERR_PTR(-EINVAL) if @oh is NULL; otherwise,
396 * passes along the return value of omap_device_build_ss().
398 struct omap_device *omap_device_build(const char *pdev_name, int pdev_id,
399 struct omap_hwmod *oh, void *pdata,
400 int pdata_len,
401 struct omap_device_pm_latency *pm_lats,
402 int pm_lats_cnt, int is_early_device)
404 struct omap_hwmod *ohs[] = { oh };
406 if (!oh)
407 return ERR_PTR(-EINVAL);
409 return omap_device_build_ss(pdev_name, pdev_id, ohs, 1, pdata,
410 pdata_len, pm_lats, pm_lats_cnt,
411 is_early_device);
415 * omap_device_build_ss - build and register an omap_device with multiple hwmods
416 * @pdev_name: name of the platform_device driver to use
417 * @pdev_id: this platform_device's connection ID
418 * @oh: ptr to the single omap_hwmod that backs this omap_device
419 * @pdata: platform_data ptr to associate with the platform_device
420 * @pdata_len: amount of memory pointed to by @pdata
421 * @pm_lats: pointer to a omap_device_pm_latency array for this device
422 * @pm_lats_cnt: ARRAY_SIZE() of @pm_lats
423 * @is_early_device: should the device be registered as an early device or not
425 * Convenience function for building and registering an omap_device
426 * subsystem record. Subsystem records consist of multiple
427 * omap_hwmods. This function in turn builds and registers a
428 * platform_device record. Returns an ERR_PTR() on error, or passes
429 * along the return value of omap_device_register().
431 struct omap_device *omap_device_build_ss(const char *pdev_name, int pdev_id,
432 struct omap_hwmod **ohs, int oh_cnt,
433 void *pdata, int pdata_len,
434 struct omap_device_pm_latency *pm_lats,
435 int pm_lats_cnt, int is_early_device)
437 int ret = -ENOMEM;
438 struct omap_device *od;
439 char *pdev_name2;
440 struct resource *res = NULL;
441 int i, res_count;
442 struct omap_hwmod **hwmods;
444 if (!ohs || oh_cnt == 0 || !pdev_name)
445 return ERR_PTR(-EINVAL);
447 if (!pdata && pdata_len > 0)
448 return ERR_PTR(-EINVAL);
450 pr_debug("omap_device: %s: building with %d hwmods\n", pdev_name,
451 oh_cnt);
453 od = kzalloc(sizeof(struct omap_device), GFP_KERNEL);
454 if (!od)
455 return ERR_PTR(-ENOMEM);
457 od->hwmods_cnt = oh_cnt;
459 hwmods = kzalloc(sizeof(struct omap_hwmod *) * oh_cnt,
460 GFP_KERNEL);
461 if (!hwmods)
462 goto odbs_exit1;
464 memcpy(hwmods, ohs, sizeof(struct omap_hwmod *) * oh_cnt);
465 od->hwmods = hwmods;
467 pdev_name2 = kzalloc(strlen(pdev_name) + 1, GFP_KERNEL);
468 if (!pdev_name2)
469 goto odbs_exit2;
470 strcpy(pdev_name2, pdev_name);
472 od->pdev.name = pdev_name2;
473 od->pdev.id = pdev_id;
475 res_count = omap_device_count_resources(od);
476 if (res_count > 0) {
477 res = kzalloc(sizeof(struct resource) * res_count, GFP_KERNEL);
478 if (!res)
479 goto odbs_exit3;
481 omap_device_fill_resources(od, res);
483 od->pdev.num_resources = res_count;
484 od->pdev.resource = res;
486 ret = platform_device_add_data(&od->pdev, pdata, pdata_len);
487 if (ret)
488 goto odbs_exit4;
490 od->pm_lats = pm_lats;
491 od->pm_lats_cnt = pm_lats_cnt;
493 if (is_early_device)
494 ret = omap_early_device_register(od);
495 else
496 ret = omap_device_register(od);
498 for (i = 0; i < oh_cnt; i++) {
499 hwmods[i]->od = od;
500 _add_optional_clock_clkdev(od, hwmods[i]);
503 if (ret)
504 goto odbs_exit4;
506 return od;
508 odbs_exit4:
509 kfree(res);
510 odbs_exit3:
511 kfree(pdev_name2);
512 odbs_exit2:
513 kfree(hwmods);
514 odbs_exit1:
515 kfree(od);
517 pr_err("omap_device: %s: build failed (%d)\n", pdev_name, ret);
519 return ERR_PTR(ret);
523 * omap_early_device_register - register an omap_device as an early platform
524 * device.
525 * @od: struct omap_device * to register
527 * Register the omap_device structure. This currently just calls
528 * platform_early_add_device() on the underlying platform_device.
529 * Returns 0 by default.
531 int omap_early_device_register(struct omap_device *od)
533 struct platform_device *devices[1];
535 devices[0] = &(od->pdev);
536 early_platform_add_devices(devices, 1);
537 return 0;
540 static int _od_runtime_suspend(struct device *dev)
542 struct platform_device *pdev = to_platform_device(dev);
543 int ret;
545 ret = pm_generic_runtime_suspend(dev);
547 if (!ret)
548 omap_device_idle(pdev);
550 return ret;
553 static int _od_runtime_idle(struct device *dev)
555 return pm_generic_runtime_idle(dev);
558 static int _od_runtime_resume(struct device *dev)
560 struct platform_device *pdev = to_platform_device(dev);
562 omap_device_enable(pdev);
564 return pm_generic_runtime_resume(dev);
567 static struct dev_power_domain omap_device_power_domain = {
568 .ops = {
569 .runtime_suspend = _od_runtime_suspend,
570 .runtime_idle = _od_runtime_idle,
571 .runtime_resume = _od_runtime_resume,
572 USE_PLATFORM_PM_SLEEP_OPS
577 * omap_device_register - register an omap_device with one omap_hwmod
578 * @od: struct omap_device * to register
580 * Register the omap_device structure. This currently just calls
581 * platform_device_register() on the underlying platform_device.
582 * Returns the return value of platform_device_register().
584 int omap_device_register(struct omap_device *od)
586 pr_debug("omap_device: %s: registering\n", od->pdev.name);
588 od->pdev.dev.parent = &omap_device_parent;
589 od->pdev.dev.pwr_domain = &omap_device_power_domain;
590 return platform_device_register(&od->pdev);
594 /* Public functions for use by device drivers through struct platform_data */
597 * omap_device_enable - fully activate an omap_device
598 * @od: struct omap_device * to activate
600 * Do whatever is necessary for the hwmods underlying omap_device @od
601 * to be accessible and ready to operate. This generally involves
602 * enabling clocks, setting SYSCONFIG registers; and in the future may
603 * involve remuxing pins. Device drivers should call this function
604 * (through platform_data function pointers) where they would normally
605 * enable clocks, etc. Returns -EINVAL if called when the omap_device
606 * is already enabled, or passes along the return value of
607 * _omap_device_activate().
609 int omap_device_enable(struct platform_device *pdev)
611 int ret;
612 struct omap_device *od;
614 od = _find_by_pdev(pdev);
616 if (od->_state == OMAP_DEVICE_STATE_ENABLED) {
617 WARN(1, "omap_device: %s.%d: %s() called from invalid state %d\n",
618 od->pdev.name, od->pdev.id, __func__, od->_state);
619 return -EINVAL;
622 /* Enable everything if we're enabling this device from scratch */
623 if (od->_state == OMAP_DEVICE_STATE_UNKNOWN)
624 od->pm_lat_level = od->pm_lats_cnt;
626 ret = _omap_device_activate(od, IGNORE_WAKEUP_LAT);
628 od->dev_wakeup_lat = 0;
629 od->_dev_wakeup_lat_limit = UINT_MAX;
630 od->_state = OMAP_DEVICE_STATE_ENABLED;
632 return ret;
636 * omap_device_idle - idle an omap_device
637 * @od: struct omap_device * to idle
639 * Idle omap_device @od by calling as many .deactivate_func() entries
640 * in the omap_device's pm_lats table as is possible without exceeding
641 * the device's maximum wakeup latency limit, pm_lat_limit. Device
642 * drivers should call this function (through platform_data function
643 * pointers) where they would normally disable clocks after operations
644 * complete, etc.. Returns -EINVAL if the omap_device is not
645 * currently enabled, or passes along the return value of
646 * _omap_device_deactivate().
648 int omap_device_idle(struct platform_device *pdev)
650 int ret;
651 struct omap_device *od;
653 od = _find_by_pdev(pdev);
655 if (od->_state != OMAP_DEVICE_STATE_ENABLED) {
656 WARN(1, "omap_device: %s.%d: %s() called from invalid state %d\n",
657 od->pdev.name, od->pdev.id, __func__, od->_state);
658 return -EINVAL;
661 ret = _omap_device_deactivate(od, USE_WAKEUP_LAT);
663 od->_state = OMAP_DEVICE_STATE_IDLE;
665 return ret;
669 * omap_device_shutdown - shut down an omap_device
670 * @od: struct omap_device * to shut down
672 * Shut down omap_device @od by calling all .deactivate_func() entries
673 * in the omap_device's pm_lats table and then shutting down all of
674 * the underlying omap_hwmods. Used when a device is being "removed"
675 * or a device driver is being unloaded. Returns -EINVAL if the
676 * omap_device is not currently enabled or idle, or passes along the
677 * return value of _omap_device_deactivate().
679 int omap_device_shutdown(struct platform_device *pdev)
681 int ret, i;
682 struct omap_device *od;
684 od = _find_by_pdev(pdev);
686 if (od->_state != OMAP_DEVICE_STATE_ENABLED &&
687 od->_state != OMAP_DEVICE_STATE_IDLE) {
688 WARN(1, "omap_device: %s.%d: %s() called from invalid state %d\n",
689 od->pdev.name, od->pdev.id, __func__, od->_state);
690 return -EINVAL;
693 ret = _omap_device_deactivate(od, IGNORE_WAKEUP_LAT);
695 for (i = 0; i < od->hwmods_cnt; i++)
696 omap_hwmod_shutdown(od->hwmods[i]);
698 od->_state = OMAP_DEVICE_STATE_SHUTDOWN;
700 return ret;
704 * omap_device_align_pm_lat - activate/deactivate device to match wakeup lat lim
705 * @od: struct omap_device *
707 * When a device's maximum wakeup latency limit changes, call some of
708 * the .activate_func or .deactivate_func function pointers in the
709 * omap_device's pm_lats array to ensure that the device's maximum
710 * wakeup latency is less than or equal to the new latency limit.
711 * Intended to be called by OMAP PM code whenever a device's maximum
712 * wakeup latency limit changes (e.g., via
713 * omap_pm_set_dev_wakeup_lat()). Returns 0 if nothing needs to be
714 * done (e.g., if the omap_device is not currently idle, or if the
715 * wakeup latency is already current with the new limit) or passes
716 * along the return value of _omap_device_deactivate() or
717 * _omap_device_activate().
719 int omap_device_align_pm_lat(struct platform_device *pdev,
720 u32 new_wakeup_lat_limit)
722 int ret = -EINVAL;
723 struct omap_device *od;
725 od = _find_by_pdev(pdev);
727 if (new_wakeup_lat_limit == od->dev_wakeup_lat)
728 return 0;
730 od->_dev_wakeup_lat_limit = new_wakeup_lat_limit;
732 if (od->_state != OMAP_DEVICE_STATE_IDLE)
733 return 0;
734 else if (new_wakeup_lat_limit > od->dev_wakeup_lat)
735 ret = _omap_device_deactivate(od, USE_WAKEUP_LAT);
736 else if (new_wakeup_lat_limit < od->dev_wakeup_lat)
737 ret = _omap_device_activate(od, USE_WAKEUP_LAT);
739 return ret;
743 * omap_device_get_pwrdm - return the powerdomain * associated with @od
744 * @od: struct omap_device *
746 * Return the powerdomain associated with the first underlying
747 * omap_hwmod for this omap_device. Intended for use by core OMAP PM
748 * code. Returns NULL on error or a struct powerdomain * upon
749 * success.
751 struct powerdomain *omap_device_get_pwrdm(struct omap_device *od)
754 * XXX Assumes that all omap_hwmod powerdomains are identical.
755 * This may not necessarily be true. There should be a sanity
756 * check in here to WARN() if any difference appears.
758 if (!od->hwmods_cnt)
759 return NULL;
761 return omap_hwmod_get_pwrdm(od->hwmods[0]);
765 * omap_device_get_mpu_rt_va - return the MPU's virtual addr for the hwmod base
766 * @od: struct omap_device *
768 * Return the MPU's virtual address for the base of the hwmod, from
769 * the ioremap() that the hwmod code does. Only valid if there is one
770 * hwmod associated with this device. Returns NULL if there are zero
771 * or more than one hwmods associated with this omap_device;
772 * otherwise, passes along the return value from
773 * omap_hwmod_get_mpu_rt_va().
775 void __iomem *omap_device_get_rt_va(struct omap_device *od)
777 if (od->hwmods_cnt != 1)
778 return NULL;
780 return omap_hwmod_get_mpu_rt_va(od->hwmods[0]);
784 * Public functions intended for use in omap_device_pm_latency
785 * .activate_func and .deactivate_func function pointers
789 * omap_device_enable_hwmods - call omap_hwmod_enable() on all hwmods
790 * @od: struct omap_device *od
792 * Enable all underlying hwmods. Returns 0.
794 int omap_device_enable_hwmods(struct omap_device *od)
796 int i;
798 for (i = 0; i < od->hwmods_cnt; i++)
799 omap_hwmod_enable(od->hwmods[i]);
801 /* XXX pass along return value here? */
802 return 0;
806 * omap_device_idle_hwmods - call omap_hwmod_idle() on all hwmods
807 * @od: struct omap_device *od
809 * Idle all underlying hwmods. Returns 0.
811 int omap_device_idle_hwmods(struct omap_device *od)
813 int i;
815 for (i = 0; i < od->hwmods_cnt; i++)
816 omap_hwmod_idle(od->hwmods[i]);
818 /* XXX pass along return value here? */
819 return 0;
823 * omap_device_disable_clocks - disable all main and interface clocks
824 * @od: struct omap_device *od
826 * Disable the main functional clock and interface clock for all of the
827 * omap_hwmods associated with the omap_device. Returns 0.
829 int omap_device_disable_clocks(struct omap_device *od)
831 int i;
833 for (i = 0; i < od->hwmods_cnt; i++)
834 omap_hwmod_disable_clocks(od->hwmods[i]);
836 /* XXX pass along return value here? */
837 return 0;
841 * omap_device_enable_clocks - enable all main and interface clocks
842 * @od: struct omap_device *od
844 * Enable the main functional clock and interface clock for all of the
845 * omap_hwmods associated with the omap_device. Returns 0.
847 int omap_device_enable_clocks(struct omap_device *od)
849 int i;
851 for (i = 0; i < od->hwmods_cnt; i++)
852 omap_hwmod_enable_clocks(od->hwmods[i]);
854 /* XXX pass along return value here? */
855 return 0;
858 struct device omap_device_parent = {
859 .init_name = "omap",
860 .parent = &platform_bus,
863 static int __init omap_device_init(void)
865 return device_register(&omap_device_parent);
867 core_initcall(omap_device_init);