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
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
20 * In the medium- to long-term, this code should either be
21 * a) implemented via arch-specific pointers in platform_data
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 {
35 * int (*device_enable)(struct platform_device *pdev);
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:
46 * pdata->device_enable = omap_device_enable;
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.
60 * Suggested usage by device drivers:
62 * During device initialization:
66 * (save remaining device context if necessary)
69 * During device resume:
71 * (restore context if necessary)
73 * During device shutdown:
75 * (device must be reinitialized at this point to use it again)
80 #include <linux/kernel.h>
81 #include <linux/platform_device.h>
82 #include <linux/slab.h>
83 #include <linux/err.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 static int omap_device_register(struct omap_device
*od
);
98 static int omap_early_device_register(struct omap_device
*od
);
100 /* Private functions */
103 * _omap_device_activate - increase device readiness
104 * @od: struct omap_device *
105 * @ignore_lat: increase to latency target (0) or full readiness (1)?
107 * Increase readiness of omap_device @od (thus decreasing device
108 * wakeup latency, but consuming more power). If @ignore_lat is
109 * IGNORE_WAKEUP_LAT, make the omap_device fully active. Otherwise,
110 * if @ignore_lat is USE_WAKEUP_LAT, and the device's maximum wakeup
111 * latency is greater than the requested maximum wakeup latency, step
112 * backwards in the omap_device_pm_latency table to ensure the
113 * device's maximum wakeup latency is less than or equal to the
114 * requested maximum wakeup latency. Returns 0.
116 static int _omap_device_activate(struct omap_device
*od
, u8 ignore_lat
)
118 struct timespec a
, b
, c
;
120 dev_dbg(&od
->pdev
.dev
, "omap_device: activating\n");
122 while (od
->pm_lat_level
> 0) {
123 struct omap_device_pm_latency
*odpl
;
124 unsigned long long act_lat
= 0;
128 odpl
= od
->pm_lats
+ od
->pm_lat_level
;
131 (od
->dev_wakeup_lat
<= od
->_dev_wakeup_lat_limit
))
134 read_persistent_clock(&a
);
136 /* XXX check return code */
137 odpl
->activate_func(od
);
139 read_persistent_clock(&b
);
141 c
= timespec_sub(b
, a
);
142 act_lat
= timespec_to_ns(&c
);
144 dev_dbg(&od
->pdev
.dev
,
145 "omap_device: pm_lat %d: activate: elapsed time "
146 "%llu nsec\n", od
->pm_lat_level
, act_lat
);
148 if (act_lat
> odpl
->activate_lat
) {
149 odpl
->activate_lat_worst
= act_lat
;
150 if (odpl
->flags
& OMAP_DEVICE_LATENCY_AUTO_ADJUST
) {
151 odpl
->activate_lat
= act_lat
;
152 dev_dbg(&od
->pdev
.dev
,
153 "new worst case activate latency "
155 od
->pm_lat_level
, act_lat
);
157 dev_warn(&od
->pdev
.dev
,
158 "activate latency %d "
159 "higher than exptected. (%llu > %d)\n",
160 od
->pm_lat_level
, act_lat
,
164 od
->dev_wakeup_lat
-= odpl
->activate_lat
;
171 * _omap_device_deactivate - decrease device readiness
172 * @od: struct omap_device *
173 * @ignore_lat: decrease to latency target (0) or full inactivity (1)?
175 * Decrease readiness of omap_device @od (thus increasing device
176 * wakeup latency, but conserving power). If @ignore_lat is
177 * IGNORE_WAKEUP_LAT, make the omap_device fully inactive. Otherwise,
178 * if @ignore_lat is USE_WAKEUP_LAT, and the device's maximum wakeup
179 * latency is less than the requested maximum wakeup latency, step
180 * forwards in the omap_device_pm_latency table to ensure the device's
181 * maximum wakeup latency is less than or equal to the requested
182 * maximum wakeup latency. Returns 0.
184 static int _omap_device_deactivate(struct omap_device
*od
, u8 ignore_lat
)
186 struct timespec a
, b
, c
;
188 dev_dbg(&od
->pdev
.dev
, "omap_device: deactivating\n");
190 while (od
->pm_lat_level
< od
->pm_lats_cnt
) {
191 struct omap_device_pm_latency
*odpl
;
192 unsigned long long deact_lat
= 0;
194 odpl
= od
->pm_lats
+ od
->pm_lat_level
;
197 ((od
->dev_wakeup_lat
+ odpl
->activate_lat
) >
198 od
->_dev_wakeup_lat_limit
))
201 read_persistent_clock(&a
);
203 /* XXX check return code */
204 odpl
->deactivate_func(od
);
206 read_persistent_clock(&b
);
208 c
= timespec_sub(b
, a
);
209 deact_lat
= timespec_to_ns(&c
);
211 dev_dbg(&od
->pdev
.dev
,
212 "omap_device: pm_lat %d: deactivate: elapsed time "
213 "%llu nsec\n", od
->pm_lat_level
, deact_lat
);
215 if (deact_lat
> odpl
->deactivate_lat
) {
216 odpl
->deactivate_lat_worst
= deact_lat
;
217 if (odpl
->flags
& OMAP_DEVICE_LATENCY_AUTO_ADJUST
) {
218 odpl
->deactivate_lat
= deact_lat
;
219 dev_dbg(&od
->pdev
.dev
,
220 "new worst case deactivate latency "
222 od
->pm_lat_level
, deact_lat
);
224 dev_warn(&od
->pdev
.dev
,
225 "deactivate latency %d "
226 "higher than exptected. (%llu > %d)\n",
227 od
->pm_lat_level
, deact_lat
,
228 odpl
->deactivate_lat
);
231 od
->dev_wakeup_lat
+= odpl
->activate_lat
;
239 static void _add_clkdev(struct omap_device
*od
, const char *clk_alias
,
240 const char *clk_name
)
243 struct clk_lookup
*l
;
245 if (!clk_alias
|| !clk_name
)
248 dev_dbg(&od
->pdev
.dev
, "Creating %s -> %s\n", clk_alias
, clk_name
);
250 r
= clk_get_sys(dev_name(&od
->pdev
.dev
), clk_alias
);
252 dev_warn(&od
->pdev
.dev
,
253 "alias %s already exists\n", clk_alias
);
258 r
= omap_clk_get_by_name(clk_name
);
260 dev_err(&od
->pdev
.dev
,
261 "omap_clk_get_by_name for %s failed\n", clk_name
);
265 l
= clkdev_alloc(r
, clk_alias
, dev_name(&od
->pdev
.dev
));
267 dev_err(&od
->pdev
.dev
,
268 "clkdev_alloc for %s failed\n", clk_alias
);
276 * _add_hwmod_clocks_clkdev - Add clkdev entry for hwmod optional clocks
278 * @od: struct omap_device *od
279 * @oh: struct omap_hwmod *oh
281 * For the main clock and every optional clock present per hwmod per
282 * omap_device, this function adds an entry in the clkdev table of the
283 * form <dev-id=dev_name, con-id=role> if it does not exist already.
285 * The function is called from inside omap_device_build_ss(), after
286 * omap_device_register.
288 * This allows drivers to get a pointer to its optional clocks based on its role
289 * by calling clk_get(<dev*>, <role>).
290 * In the case of the main clock, a "fck" alias is used.
294 static void _add_hwmod_clocks_clkdev(struct omap_device
*od
,
295 struct omap_hwmod
*oh
)
299 _add_clkdev(od
, "fck", oh
->main_clk
);
301 for (i
= 0; i
< oh
->opt_clks_cnt
; i
++)
302 _add_clkdev(od
, oh
->opt_clks
[i
].role
, oh
->opt_clks
[i
].clk
);
306 /* Public functions for use by core code */
309 * omap_device_get_context_loss_count - get lost context count
310 * @od: struct omap_device *
312 * Using the primary hwmod, query the context loss count for this
315 * Callers should consider context for this device lost any time this
316 * function returns a value different than the value the caller got
317 * the last time it called this function.
319 * If any hwmods exist for the omap_device assoiated with @pdev,
320 * return the context loss counter for that hwmod, otherwise return
323 u32
omap_device_get_context_loss_count(struct platform_device
*pdev
)
325 struct omap_device
*od
;
328 od
= to_omap_device(pdev
);
331 ret
= omap_hwmod_get_context_loss_count(od
->hwmods
[0]);
337 * omap_device_count_resources - count number of struct resource entries needed
338 * @od: struct omap_device *
340 * Count the number of struct resource entries needed for this
341 * omap_device @od. Used by omap_device_build_ss() to determine how
342 * much memory to allocate before calling
343 * omap_device_fill_resources(). Returns the count.
345 static int omap_device_count_resources(struct omap_device
*od
)
350 for (i
= 0; i
< od
->hwmods_cnt
; i
++)
351 c
+= omap_hwmod_count_resources(od
->hwmods
[i
]);
353 pr_debug("omap_device: %s: counted %d total resources across %d "
354 "hwmods\n", od
->pdev
.name
, c
, od
->hwmods_cnt
);
360 * omap_device_fill_resources - fill in array of struct resource
361 * @od: struct omap_device *
362 * @res: pointer to an array of struct resource to be filled in
364 * Populate one or more empty struct resource pointed to by @res with
365 * the resource data for this omap_device @od. Used by
366 * omap_device_build_ss() after calling omap_device_count_resources().
367 * Ideally this function would not be needed at all. If omap_device
368 * replaces platform_device, then we can specify our own
369 * get_resource()/ get_irq()/etc functions that use the underlying
370 * omap_hwmod information. Or if platform_device is extended to use
371 * subarchitecture-specific function pointers, the various
372 * platform_device functions can simply call omap_device internal
373 * functions to get device resources. Hacking around the existing
374 * platform_device code wastes memory. Returns 0.
376 static int omap_device_fill_resources(struct omap_device
*od
,
377 struct resource
*res
)
382 for (i
= 0; i
< od
->hwmods_cnt
; i
++) {
383 r
= omap_hwmod_fill_resources(od
->hwmods
[i
], res
);
392 * omap_device_build - build and register an omap_device with one omap_hwmod
393 * @pdev_name: name of the platform_device driver to use
394 * @pdev_id: this platform_device's connection ID
395 * @oh: ptr to the single omap_hwmod that backs this omap_device
396 * @pdata: platform_data ptr to associate with the platform_device
397 * @pdata_len: amount of memory pointed to by @pdata
398 * @pm_lats: pointer to a omap_device_pm_latency array for this device
399 * @pm_lats_cnt: ARRAY_SIZE() of @pm_lats
400 * @is_early_device: should the device be registered as an early device or not
402 * Convenience function for building and registering a single
403 * omap_device record, which in turn builds and registers a
404 * platform_device record. See omap_device_build_ss() for more
405 * information. Returns ERR_PTR(-EINVAL) if @oh is NULL; otherwise,
406 * passes along the return value of omap_device_build_ss().
408 struct platform_device
*omap_device_build(const char *pdev_name
, int pdev_id
,
409 struct omap_hwmod
*oh
, void *pdata
,
411 struct omap_device_pm_latency
*pm_lats
,
412 int pm_lats_cnt
, int is_early_device
)
414 struct omap_hwmod
*ohs
[] = { oh
};
417 return ERR_PTR(-EINVAL
);
419 return omap_device_build_ss(pdev_name
, pdev_id
, ohs
, 1, pdata
,
420 pdata_len
, pm_lats
, pm_lats_cnt
,
425 * omap_device_build_ss - build and register an omap_device with multiple hwmods
426 * @pdev_name: name of the platform_device driver to use
427 * @pdev_id: this platform_device's connection ID
428 * @oh: ptr to the single omap_hwmod that backs this omap_device
429 * @pdata: platform_data ptr to associate with the platform_device
430 * @pdata_len: amount of memory pointed to by @pdata
431 * @pm_lats: pointer to a omap_device_pm_latency array for this device
432 * @pm_lats_cnt: ARRAY_SIZE() of @pm_lats
433 * @is_early_device: should the device be registered as an early device or not
435 * Convenience function for building and registering an omap_device
436 * subsystem record. Subsystem records consist of multiple
437 * omap_hwmods. This function in turn builds and registers a
438 * platform_device record. Returns an ERR_PTR() on error, or passes
439 * along the return value of omap_device_register().
441 struct platform_device
*omap_device_build_ss(const char *pdev_name
, int pdev_id
,
442 struct omap_hwmod
**ohs
, int oh_cnt
,
443 void *pdata
, int pdata_len
,
444 struct omap_device_pm_latency
*pm_lats
,
445 int pm_lats_cnt
, int is_early_device
)
448 struct omap_device
*od
;
450 struct resource
*res
= NULL
;
452 struct omap_hwmod
**hwmods
;
454 if (!ohs
|| oh_cnt
== 0 || !pdev_name
)
455 return ERR_PTR(-EINVAL
);
457 if (!pdata
&& pdata_len
> 0)
458 return ERR_PTR(-EINVAL
);
460 pr_debug("omap_device: %s: building with %d hwmods\n", pdev_name
,
463 od
= kzalloc(sizeof(struct omap_device
), GFP_KERNEL
);
465 return ERR_PTR(-ENOMEM
);
467 od
->hwmods_cnt
= oh_cnt
;
469 hwmods
= kzalloc(sizeof(struct omap_hwmod
*) * oh_cnt
,
474 memcpy(hwmods
, ohs
, sizeof(struct omap_hwmod
*) * oh_cnt
);
477 pdev_name2
= kzalloc(strlen(pdev_name
) + 1, GFP_KERNEL
);
480 strcpy(pdev_name2
, pdev_name
);
482 od
->pdev
.name
= pdev_name2
;
483 od
->pdev
.id
= pdev_id
;
485 res_count
= omap_device_count_resources(od
);
487 res
= kzalloc(sizeof(struct resource
) * res_count
, GFP_KERNEL
);
491 omap_device_fill_resources(od
, res
);
493 od
->pdev
.num_resources
= res_count
;
494 od
->pdev
.resource
= res
;
496 ret
= platform_device_add_data(&od
->pdev
, pdata
, pdata_len
);
500 od
->pm_lats
= pm_lats
;
501 od
->pm_lats_cnt
= pm_lats_cnt
;
504 ret
= omap_early_device_register(od
);
506 ret
= omap_device_register(od
);
508 for (i
= 0; i
< oh_cnt
; i
++) {
510 _add_hwmod_clocks_clkdev(od
, hwmods
[i
]);
527 pr_err("omap_device: %s: build failed (%d)\n", pdev_name
, ret
);
533 * omap_early_device_register - register an omap_device as an early platform
535 * @od: struct omap_device * to register
537 * Register the omap_device structure. This currently just calls
538 * platform_early_add_device() on the underlying platform_device.
539 * Returns 0 by default.
541 static int omap_early_device_register(struct omap_device
*od
)
543 struct platform_device
*devices
[1];
545 devices
[0] = &(od
->pdev
);
546 early_platform_add_devices(devices
, 1);
550 #ifdef CONFIG_PM_RUNTIME
551 static int _od_runtime_suspend(struct device
*dev
)
553 struct platform_device
*pdev
= to_platform_device(dev
);
556 ret
= pm_generic_runtime_suspend(dev
);
559 omap_device_idle(pdev
);
564 static int _od_runtime_idle(struct device
*dev
)
566 return pm_generic_runtime_idle(dev
);
569 static int _od_runtime_resume(struct device
*dev
)
571 struct platform_device
*pdev
= to_platform_device(dev
);
573 omap_device_enable(pdev
);
575 return pm_generic_runtime_resume(dev
);
579 #ifdef CONFIG_SUSPEND
580 static int _od_suspend_noirq(struct device
*dev
)
582 struct platform_device
*pdev
= to_platform_device(dev
);
583 struct omap_device
*od
= to_omap_device(pdev
);
586 if (od
->flags
& OMAP_DEVICE_NO_IDLE_ON_SUSPEND
)
587 return pm_generic_suspend_noirq(dev
);
589 ret
= pm_generic_suspend_noirq(dev
);
591 if (!ret
&& !pm_runtime_status_suspended(dev
)) {
592 if (pm_generic_runtime_suspend(dev
) == 0) {
593 omap_device_idle(pdev
);
594 od
->flags
|= OMAP_DEVICE_SUSPENDED
;
601 static int _od_resume_noirq(struct device
*dev
)
603 struct platform_device
*pdev
= to_platform_device(dev
);
604 struct omap_device
*od
= to_omap_device(pdev
);
606 if (od
->flags
& OMAP_DEVICE_NO_IDLE_ON_SUSPEND
)
607 return pm_generic_resume_noirq(dev
);
609 if ((od
->flags
& OMAP_DEVICE_SUSPENDED
) &&
610 !pm_runtime_status_suspended(dev
)) {
611 od
->flags
&= ~OMAP_DEVICE_SUSPENDED
;
612 omap_device_enable(pdev
);
613 pm_generic_runtime_resume(dev
);
616 return pm_generic_resume_noirq(dev
);
619 #define _od_suspend_noirq NULL
620 #define _od_resume_noirq NULL
623 static struct dev_pm_domain omap_device_pm_domain
= {
625 SET_RUNTIME_PM_OPS(_od_runtime_suspend
, _od_runtime_resume
,
627 USE_PLATFORM_PM_SLEEP_OPS
628 .suspend_noirq
= _od_suspend_noirq
,
629 .resume_noirq
= _od_resume_noirq
,
634 * omap_device_register - register an omap_device with one omap_hwmod
635 * @od: struct omap_device * to register
637 * Register the omap_device structure. This currently just calls
638 * platform_device_register() on the underlying platform_device.
639 * Returns the return value of platform_device_register().
641 static int omap_device_register(struct omap_device
*od
)
643 pr_debug("omap_device: %s: registering\n", od
->pdev
.name
);
645 od
->pdev
.dev
.parent
= &omap_device_parent
;
646 od
->pdev
.dev
.pm_domain
= &omap_device_pm_domain
;
647 return platform_device_register(&od
->pdev
);
651 /* Public functions for use by device drivers through struct platform_data */
654 * omap_device_enable - fully activate an omap_device
655 * @od: struct omap_device * to activate
657 * Do whatever is necessary for the hwmods underlying omap_device @od
658 * to be accessible and ready to operate. This generally involves
659 * enabling clocks, setting SYSCONFIG registers; and in the future may
660 * involve remuxing pins. Device drivers should call this function
661 * (through platform_data function pointers) where they would normally
662 * enable clocks, etc. Returns -EINVAL if called when the omap_device
663 * is already enabled, or passes along the return value of
664 * _omap_device_activate().
666 int omap_device_enable(struct platform_device
*pdev
)
669 struct omap_device
*od
;
671 od
= to_omap_device(pdev
);
673 if (od
->_state
== OMAP_DEVICE_STATE_ENABLED
) {
675 "omap_device: %s() called from invalid state %d\n",
676 __func__
, od
->_state
);
680 /* Enable everything if we're enabling this device from scratch */
681 if (od
->_state
== OMAP_DEVICE_STATE_UNKNOWN
)
682 od
->pm_lat_level
= od
->pm_lats_cnt
;
684 ret
= _omap_device_activate(od
, IGNORE_WAKEUP_LAT
);
686 od
->dev_wakeup_lat
= 0;
687 od
->_dev_wakeup_lat_limit
= UINT_MAX
;
688 od
->_state
= OMAP_DEVICE_STATE_ENABLED
;
694 * omap_device_idle - idle an omap_device
695 * @od: struct omap_device * to idle
697 * Idle omap_device @od by calling as many .deactivate_func() entries
698 * in the omap_device's pm_lats table as is possible without exceeding
699 * the device's maximum wakeup latency limit, pm_lat_limit. Device
700 * drivers should call this function (through platform_data function
701 * pointers) where they would normally disable clocks after operations
702 * complete, etc.. Returns -EINVAL if the omap_device is not
703 * currently enabled, or passes along the return value of
704 * _omap_device_deactivate().
706 int omap_device_idle(struct platform_device
*pdev
)
709 struct omap_device
*od
;
711 od
= to_omap_device(pdev
);
713 if (od
->_state
!= OMAP_DEVICE_STATE_ENABLED
) {
715 "omap_device: %s() called from invalid state %d\n",
716 __func__
, od
->_state
);
720 ret
= _omap_device_deactivate(od
, USE_WAKEUP_LAT
);
722 od
->_state
= OMAP_DEVICE_STATE_IDLE
;
728 * omap_device_shutdown - shut down an omap_device
729 * @od: struct omap_device * to shut down
731 * Shut down omap_device @od by calling all .deactivate_func() entries
732 * in the omap_device's pm_lats table and then shutting down all of
733 * the underlying omap_hwmods. Used when a device is being "removed"
734 * or a device driver is being unloaded. Returns -EINVAL if the
735 * omap_device is not currently enabled or idle, or passes along the
736 * return value of _omap_device_deactivate().
738 int omap_device_shutdown(struct platform_device
*pdev
)
741 struct omap_device
*od
;
743 od
= to_omap_device(pdev
);
745 if (od
->_state
!= OMAP_DEVICE_STATE_ENABLED
&&
746 od
->_state
!= OMAP_DEVICE_STATE_IDLE
) {
748 "omap_device: %s() called from invalid state %d\n",
749 __func__
, od
->_state
);
753 ret
= _omap_device_deactivate(od
, IGNORE_WAKEUP_LAT
);
755 for (i
= 0; i
< od
->hwmods_cnt
; i
++)
756 omap_hwmod_shutdown(od
->hwmods
[i
]);
758 od
->_state
= OMAP_DEVICE_STATE_SHUTDOWN
;
764 * omap_device_align_pm_lat - activate/deactivate device to match wakeup lat lim
765 * @od: struct omap_device *
767 * When a device's maximum wakeup latency limit changes, call some of
768 * the .activate_func or .deactivate_func function pointers in the
769 * omap_device's pm_lats array to ensure that the device's maximum
770 * wakeup latency is less than or equal to the new latency limit.
771 * Intended to be called by OMAP PM code whenever a device's maximum
772 * wakeup latency limit changes (e.g., via
773 * omap_pm_set_dev_wakeup_lat()). Returns 0 if nothing needs to be
774 * done (e.g., if the omap_device is not currently idle, or if the
775 * wakeup latency is already current with the new limit) or passes
776 * along the return value of _omap_device_deactivate() or
777 * _omap_device_activate().
779 int omap_device_align_pm_lat(struct platform_device
*pdev
,
780 u32 new_wakeup_lat_limit
)
783 struct omap_device
*od
;
785 od
= to_omap_device(pdev
);
787 if (new_wakeup_lat_limit
== od
->dev_wakeup_lat
)
790 od
->_dev_wakeup_lat_limit
= new_wakeup_lat_limit
;
792 if (od
->_state
!= OMAP_DEVICE_STATE_IDLE
)
794 else if (new_wakeup_lat_limit
> od
->dev_wakeup_lat
)
795 ret
= _omap_device_deactivate(od
, USE_WAKEUP_LAT
);
796 else if (new_wakeup_lat_limit
< od
->dev_wakeup_lat
)
797 ret
= _omap_device_activate(od
, USE_WAKEUP_LAT
);
803 * omap_device_get_pwrdm - return the powerdomain * associated with @od
804 * @od: struct omap_device *
806 * Return the powerdomain associated with the first underlying
807 * omap_hwmod for this omap_device. Intended for use by core OMAP PM
808 * code. Returns NULL on error or a struct powerdomain * upon
811 struct powerdomain
*omap_device_get_pwrdm(struct omap_device
*od
)
814 * XXX Assumes that all omap_hwmod powerdomains are identical.
815 * This may not necessarily be true. There should be a sanity
816 * check in here to WARN() if any difference appears.
821 return omap_hwmod_get_pwrdm(od
->hwmods
[0]);
825 * omap_device_get_mpu_rt_va - return the MPU's virtual addr for the hwmod base
826 * @od: struct omap_device *
828 * Return the MPU's virtual address for the base of the hwmod, from
829 * the ioremap() that the hwmod code does. Only valid if there is one
830 * hwmod associated with this device. Returns NULL if there are zero
831 * or more than one hwmods associated with this omap_device;
832 * otherwise, passes along the return value from
833 * omap_hwmod_get_mpu_rt_va().
835 void __iomem
*omap_device_get_rt_va(struct omap_device
*od
)
837 if (od
->hwmods_cnt
!= 1)
840 return omap_hwmod_get_mpu_rt_va(od
->hwmods
[0]);
844 * Public functions intended for use in omap_device_pm_latency
845 * .activate_func and .deactivate_func function pointers
849 * omap_device_enable_hwmods - call omap_hwmod_enable() on all hwmods
850 * @od: struct omap_device *od
852 * Enable all underlying hwmods. Returns 0.
854 int omap_device_enable_hwmods(struct omap_device
*od
)
858 for (i
= 0; i
< od
->hwmods_cnt
; i
++)
859 omap_hwmod_enable(od
->hwmods
[i
]);
861 /* XXX pass along return value here? */
866 * omap_device_idle_hwmods - call omap_hwmod_idle() on all hwmods
867 * @od: struct omap_device *od
869 * Idle all underlying hwmods. Returns 0.
871 int omap_device_idle_hwmods(struct omap_device
*od
)
875 for (i
= 0; i
< od
->hwmods_cnt
; i
++)
876 omap_hwmod_idle(od
->hwmods
[i
]);
878 /* XXX pass along return value here? */
883 * omap_device_disable_clocks - disable all main and interface clocks
884 * @od: struct omap_device *od
886 * Disable the main functional clock and interface clock for all of the
887 * omap_hwmods associated with the omap_device. Returns 0.
889 int omap_device_disable_clocks(struct omap_device
*od
)
893 for (i
= 0; i
< od
->hwmods_cnt
; i
++)
894 omap_hwmod_disable_clocks(od
->hwmods
[i
]);
896 /* XXX pass along return value here? */
901 * omap_device_enable_clocks - enable all main and interface clocks
902 * @od: struct omap_device *od
904 * Enable the main functional clock and interface clock for all of the
905 * omap_hwmods associated with the omap_device. Returns 0.
907 int omap_device_enable_clocks(struct omap_device
*od
)
911 for (i
= 0; i
< od
->hwmods_cnt
; i
++)
912 omap_hwmod_enable_clocks(od
->hwmods
[i
]);
914 /* XXX pass along return value here? */
918 struct device omap_device_parent
= {
920 .parent
= &platform_bus
,
923 static int __init
omap_device_init(void)
925 return device_register(&omap_device_parent
);
927 core_initcall(omap_device_init
);