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/export.h>
82 #include <linux/platform_device.h>
83 #include <linux/slab.h>
84 #include <linux/err.h>
86 #include <linux/clk.h>
87 #include <linux/clkdev.h>
88 #include <linux/pm_runtime.h>
90 #include <linux/notifier.h>
92 #include <plat/omap_device.h>
93 #include <plat/omap_hwmod.h>
94 #include <plat/clock.h>
96 /* These parameters are passed to _omap_device_{de,}activate() */
97 #define USE_WAKEUP_LAT 0
98 #define IGNORE_WAKEUP_LAT 1
100 static int omap_early_device_register(struct platform_device *pdev);
102 static struct omap_device_pm_latency omap_default_latency[] = {
104 .deactivate_func = omap_device_idle_hwmods,
105 .activate_func = omap_device_enable_hwmods,
106 .flags = OMAP_DEVICE_LATENCY_AUTO_ADJUST,
110 /* Private functions */
113 * _omap_device_activate - increase device readiness
114 * @od: struct omap_device *
115 * @ignore_lat: increase to latency target (0) or full readiness (1)?
117 * Increase readiness of omap_device @od (thus decreasing device
118 * wakeup latency, but consuming more power). If @ignore_lat is
119 * IGNORE_WAKEUP_LAT, make the omap_device fully active. Otherwise,
120 * if @ignore_lat is USE_WAKEUP_LAT, and the device's maximum wakeup
121 * latency is greater than the requested maximum wakeup latency, step
122 * backwards in the omap_device_pm_latency table to ensure the
123 * device's maximum wakeup latency is less than or equal to the
124 * requested maximum wakeup latency. Returns 0.
126 static int _omap_device_activate(struct omap_device *od, u8 ignore_lat)
128 struct timespec a, b, c;
130 dev_dbg(&od->pdev->dev, "omap_device: activating\n");
132 while (od->pm_lat_level > 0) {
133 struct omap_device_pm_latency *odpl;
134 unsigned long long act_lat = 0;
138 odpl = od->pm_lats + od->pm_lat_level;
141 (od->dev_wakeup_lat <= od->_dev_wakeup_lat_limit))
144 read_persistent_clock(&a);
146 /* XXX check return code */
147 odpl->activate_func(od);
149 read_persistent_clock(&b);
151 c = timespec_sub(b, a);
152 act_lat = timespec_to_ns(&c);
154 dev_dbg(&od->pdev->dev,
155 "omap_device: pm_lat %d: activate: elapsed time %llu nsec\n",
156 od->pm_lat_level, act_lat);
158 if (act_lat > odpl->activate_lat) {
159 odpl->activate_lat_worst = act_lat;
160 if (odpl->flags & OMAP_DEVICE_LATENCY_AUTO_ADJUST) {
161 odpl->activate_lat = act_lat;
162 dev_dbg(&od->pdev->dev,
163 "new worst case activate latency %d: %llu\n",
164 od->pm_lat_level, act_lat);
166 dev_warn(&od->pdev->dev,
167 "activate latency %d higher than expected. (%llu > %d)\n",
168 od->pm_lat_level, act_lat,
172 od->dev_wakeup_lat -= odpl->activate_lat;
179 * _omap_device_deactivate - decrease device readiness
180 * @od: struct omap_device *
181 * @ignore_lat: decrease to latency target (0) or full inactivity (1)?
183 * Decrease readiness of omap_device @od (thus increasing device
184 * wakeup latency, but conserving power). If @ignore_lat is
185 * IGNORE_WAKEUP_LAT, make the omap_device fully inactive. Otherwise,
186 * if @ignore_lat is USE_WAKEUP_LAT, and the device's maximum wakeup
187 * latency is less than the requested maximum wakeup latency, step
188 * forwards in the omap_device_pm_latency table to ensure the device's
189 * maximum wakeup latency is less than or equal to the requested
190 * maximum wakeup latency. Returns 0.
192 static int _omap_device_deactivate(struct omap_device *od, u8 ignore_lat)
194 struct timespec a, b, c;
196 dev_dbg(&od->pdev->dev, "omap_device: deactivating\n");
198 while (od->pm_lat_level < od->pm_lats_cnt) {
199 struct omap_device_pm_latency *odpl;
200 unsigned long long deact_lat = 0;
202 odpl = od->pm_lats + od->pm_lat_level;
205 ((od->dev_wakeup_lat + odpl->activate_lat) >
206 od->_dev_wakeup_lat_limit))
209 read_persistent_clock(&a);
211 /* XXX check return code */
212 odpl->deactivate_func(od);
214 read_persistent_clock(&b);
216 c = timespec_sub(b, a);
217 deact_lat = timespec_to_ns(&c);
219 dev_dbg(&od->pdev->dev,
220 "omap_device: pm_lat %d: deactivate: elapsed time %llu nsec\n",
221 od->pm_lat_level, deact_lat);
223 if (deact_lat > odpl->deactivate_lat) {
224 odpl->deactivate_lat_worst = deact_lat;
225 if (odpl->flags & OMAP_DEVICE_LATENCY_AUTO_ADJUST) {
226 odpl->deactivate_lat = deact_lat;
227 dev_dbg(&od->pdev->dev,
228 "new worst case deactivate latency %d: %llu\n",
229 od->pm_lat_level, deact_lat);
231 dev_warn(&od->pdev->dev,
232 "deactivate latency %d higher than expected. (%llu > %d)\n",
233 od->pm_lat_level, deact_lat,
234 odpl->deactivate_lat);
237 od->dev_wakeup_lat += odpl->activate_lat;
245 static void _add_clkdev(struct omap_device *od, const char *clk_alias,
246 const char *clk_name)
249 struct clk_lookup *l;
251 if (!clk_alias || !clk_name)
254 dev_dbg(&od->pdev->dev, "Creating %s -> %s\n", clk_alias, clk_name);
256 r = clk_get_sys(dev_name(&od->pdev->dev), clk_alias);
258 dev_warn(&od->pdev->dev,
259 "alias %s already exists\n", clk_alias);
264 r = omap_clk_get_by_name(clk_name);
266 dev_err(&od->pdev->dev,
267 "omap_clk_get_by_name for %s failed\n", clk_name);
271 l = clkdev_alloc(r, clk_alias, dev_name(&od->pdev->dev));
273 dev_err(&od->pdev->dev,
274 "clkdev_alloc for %s failed\n", clk_alias);
282 * _add_hwmod_clocks_clkdev - Add clkdev entry for hwmod optional clocks
284 * @od: struct omap_device *od
285 * @oh: struct omap_hwmod *oh
287 * For the main clock and every optional clock present per hwmod per
288 * omap_device, this function adds an entry in the clkdev table of the
289 * form <dev-id=dev_name, con-id=role> if it does not exist already.
291 * The function is called from inside omap_device_build_ss(), after
292 * omap_device_register.
294 * This allows drivers to get a pointer to its optional clocks based on its role
295 * by calling clk_get(<dev*>, <role>).
296 * In the case of the main clock, a "fck" alias is used.
300 static void _add_hwmod_clocks_clkdev(struct omap_device *od,
301 struct omap_hwmod *oh)
305 _add_clkdev(od, "fck", oh->main_clk);
307 for (i = 0; i < oh->opt_clks_cnt; i++)
308 _add_clkdev(od, oh->opt_clks[i].role, oh->opt_clks[i].clk);
313 * omap_device_build_from_dt - build an omap_device with multiple hwmods
314 * @pdev_name: name of the platform_device driver to use
315 * @pdev_id: this platform_device's connection ID
316 * @oh: ptr to the single omap_hwmod that backs this omap_device
317 * @pdata: platform_data ptr to associate with the platform_device
318 * @pdata_len: amount of memory pointed to by @pdata
319 * @pm_lats: pointer to a omap_device_pm_latency array for this device
320 * @pm_lats_cnt: ARRAY_SIZE() of @pm_lats
321 * @is_early_device: should the device be registered as an early device or not
323 * Function for building an omap_device already registered from device-tree
325 * Returns 0 or PTR_ERR() on error.
327 static int omap_device_build_from_dt(struct platform_device *pdev)
329 struct omap_hwmod **hwmods;
330 struct omap_device *od;
331 struct omap_hwmod *oh;
332 struct device_node *node = pdev->dev.of_node;
334 int oh_cnt, i, ret = 0;
336 oh_cnt = of_property_count_strings(node, "ti,hwmods");
337 if (!oh_cnt || IS_ERR_VALUE(oh_cnt)) {
338 dev_dbg(&pdev->dev, "No 'hwmods' to build omap_device\n");
342 hwmods = kzalloc(sizeof(struct omap_hwmod *) * oh_cnt, GFP_KERNEL);
348 for (i = 0; i < oh_cnt; i++) {
349 of_property_read_string_index(node, "ti,hwmods", i, &oh_name);
350 oh = omap_hwmod_lookup(oh_name);
352 dev_err(&pdev->dev, "Cannot lookup hwmod '%s'\n",
360 od = omap_device_alloc(pdev, hwmods, oh_cnt, NULL, 0);
362 dev_err(&pdev->dev, "Cannot allocate omap_device for :%s\n",
368 if (of_get_property(node, "ti,no_idle_on_suspend", NULL))
369 omap_device_disable_idle_on_suspend(pdev);
371 pdev->dev.pm_domain = &omap_device_pm_domain;
379 static int _omap_device_notifier_call(struct notifier_block *nb,
380 unsigned long event, void *dev)
382 struct platform_device *pdev = to_platform_device(dev);
383 struct omap_device *od;
386 case BUS_NOTIFY_DEL_DEVICE:
387 if (pdev->archdata.od)
388 omap_device_delete(pdev->archdata.od);
390 case BUS_NOTIFY_ADD_DEVICE:
391 if (pdev->dev.of_node)
392 omap_device_build_from_dt(pdev);
395 od = to_omap_device(pdev);
397 od->_driver_status = event;
404 /* Public functions for use by core code */
407 * omap_device_get_context_loss_count - get lost context count
408 * @od: struct omap_device *
410 * Using the primary hwmod, query the context loss count for this
413 * Callers should consider context for this device lost any time this
414 * function returns a value different than the value the caller got
415 * the last time it called this function.
417 * If any hwmods exist for the omap_device assoiated with @pdev,
418 * return the context loss counter for that hwmod, otherwise return
421 int omap_device_get_context_loss_count(struct platform_device *pdev)
423 struct omap_device *od;
426 od = to_omap_device(pdev);
429 ret = omap_hwmod_get_context_loss_count(od->hwmods[0]);
435 * omap_device_count_resources - count number of struct resource entries needed
436 * @od: struct omap_device *
438 * Count the number of struct resource entries needed for this
439 * omap_device @od. Used by omap_device_build_ss() to determine how
440 * much memory to allocate before calling
441 * omap_device_fill_resources(). Returns the count.
443 static int omap_device_count_resources(struct omap_device *od)
448 for (i = 0; i < od->hwmods_cnt; i++)
449 c += omap_hwmod_count_resources(od->hwmods[i]);
451 pr_debug("omap_device: %s: counted %d total resources across %d hwmods\n",
452 od->pdev->name, c, od->hwmods_cnt);
458 * omap_device_fill_resources - fill in array of struct resource
459 * @od: struct omap_device *
460 * @res: pointer to an array of struct resource to be filled in
462 * Populate one or more empty struct resource pointed to by @res with
463 * the resource data for this omap_device @od. Used by
464 * omap_device_build_ss() after calling omap_device_count_resources().
465 * Ideally this function would not be needed at all. If omap_device
466 * replaces platform_device, then we can specify our own
467 * get_resource()/ get_irq()/etc functions that use the underlying
468 * omap_hwmod information. Or if platform_device is extended to use
469 * subarchitecture-specific function pointers, the various
470 * platform_device functions can simply call omap_device internal
471 * functions to get device resources. Hacking around the existing
472 * platform_device code wastes memory. Returns 0.
474 static int omap_device_fill_resources(struct omap_device *od,
475 struct resource *res)
479 for (i = 0; i < od->hwmods_cnt; i++) {
480 r = omap_hwmod_fill_resources(od->hwmods[i], res);
488 * omap_device_alloc - allocate an omap_device
489 * @pdev: platform_device that will be included in this omap_device
490 * @oh: ptr to the single omap_hwmod that backs this omap_device
491 * @pdata: platform_data ptr to associate with the platform_device
492 * @pdata_len: amount of memory pointed to by @pdata
493 * @pm_lats: pointer to a omap_device_pm_latency array for this device
494 * @pm_lats_cnt: ARRAY_SIZE() of @pm_lats
496 * Convenience function for allocating an omap_device structure and filling
497 * hwmods, resources and pm_latency attributes.
499 * Returns an struct omap_device pointer or ERR_PTR() on error;
501 struct omap_device *omap_device_alloc(struct platform_device *pdev,
502 struct omap_hwmod **ohs, int oh_cnt,
503 struct omap_device_pm_latency *pm_lats,
507 struct omap_device *od;
508 struct resource *res = NULL;
510 struct omap_hwmod **hwmods;
512 od = kzalloc(sizeof(struct omap_device), GFP_KERNEL);
517 od->hwmods_cnt = oh_cnt;
519 hwmods = kmemdup(ohs, sizeof(struct omap_hwmod *) * oh_cnt, GFP_KERNEL);
527 * HACK: Ideally the resources from DT should match, and hwmod
528 * should just add the missing ones. Since the name is not
529 * properly populated by DT, stick to hwmod resources only.
531 if (pdev->num_resources && pdev->resource)
532 dev_warn(&pdev->dev, "%s(): resources already allocated %d\n",
533 __func__, pdev->num_resources);
535 res_count = omap_device_count_resources(od);
537 dev_dbg(&pdev->dev, "%s(): resources allocated from hwmod %d\n",
538 __func__, res_count);
539 res = kzalloc(sizeof(struct resource) * res_count, GFP_KERNEL);
543 omap_device_fill_resources(od, res);
545 ret = platform_device_add_resources(pdev, res, res_count);
553 pm_lats = omap_default_latency;
554 pm_lats_cnt = ARRAY_SIZE(omap_default_latency);
557 od->pm_lats_cnt = pm_lats_cnt;
558 od->pm_lats = kmemdup(pm_lats,
559 sizeof(struct omap_device_pm_latency) * pm_lats_cnt,
564 pdev->archdata.od = od;
566 for (i = 0; i < oh_cnt; i++) {
568 _add_hwmod_clocks_clkdev(od, hwmods[i]);
578 dev_err(&pdev->dev, "omap_device: build failed (%d)\n", ret);
583 void omap_device_delete(struct omap_device *od)
588 od->pdev->archdata.od = NULL;
595 * omap_device_build - build and register an omap_device with one omap_hwmod
596 * @pdev_name: name of the platform_device driver to use
597 * @pdev_id: this platform_device's connection ID
598 * @oh: ptr to the single omap_hwmod that backs this omap_device
599 * @pdata: platform_data ptr to associate with the platform_device
600 * @pdata_len: amount of memory pointed to by @pdata
601 * @pm_lats: pointer to a omap_device_pm_latency array for this device
602 * @pm_lats_cnt: ARRAY_SIZE() of @pm_lats
603 * @is_early_device: should the device be registered as an early device or not
605 * Convenience function for building and registering a single
606 * omap_device record, which in turn builds and registers a
607 * platform_device record. See omap_device_build_ss() for more
608 * information. Returns ERR_PTR(-EINVAL) if @oh is NULL; otherwise,
609 * passes along the return value of omap_device_build_ss().
611 struct platform_device __init *omap_device_build(const char *pdev_name, int pdev_id,
612 struct omap_hwmod *oh, void *pdata,
614 struct omap_device_pm_latency *pm_lats,
615 int pm_lats_cnt, int is_early_device)
617 struct omap_hwmod *ohs[] = { oh };
620 return ERR_PTR(-EINVAL);
622 return omap_device_build_ss(pdev_name, pdev_id, ohs, 1, pdata,
623 pdata_len, pm_lats, pm_lats_cnt,
628 * omap_device_build_ss - build and register an omap_device with multiple hwmods
629 * @pdev_name: name of the platform_device driver to use
630 * @pdev_id: this platform_device's connection ID
631 * @oh: ptr to the single omap_hwmod that backs this omap_device
632 * @pdata: platform_data ptr to associate with the platform_device
633 * @pdata_len: amount of memory pointed to by @pdata
634 * @pm_lats: pointer to a omap_device_pm_latency array for this device
635 * @pm_lats_cnt: ARRAY_SIZE() of @pm_lats
636 * @is_early_device: should the device be registered as an early device or not
638 * Convenience function for building and registering an omap_device
639 * subsystem record. Subsystem records consist of multiple
640 * omap_hwmods. This function in turn builds and registers a
641 * platform_device record. Returns an ERR_PTR() on error, or passes
642 * along the return value of omap_device_register().
644 struct platform_device __init *omap_device_build_ss(const char *pdev_name, int pdev_id,
645 struct omap_hwmod **ohs, int oh_cnt,
646 void *pdata, int pdata_len,
647 struct omap_device_pm_latency *pm_lats,
648 int pm_lats_cnt, int is_early_device)
651 struct platform_device *pdev;
652 struct omap_device *od;
654 if (!ohs || oh_cnt == 0 || !pdev_name)
655 return ERR_PTR(-EINVAL);
657 if (!pdata && pdata_len > 0)
658 return ERR_PTR(-EINVAL);
660 pdev = platform_device_alloc(pdev_name, pdev_id);
666 /* Set the dev_name early to allow dev_xxx in omap_device_alloc */
668 dev_set_name(&pdev->dev, "%s.%d", pdev->name, pdev->id);
670 dev_set_name(&pdev->dev, "%s", pdev->name);
672 od = omap_device_alloc(pdev, ohs, oh_cnt, pm_lats, pm_lats_cnt);
676 ret = platform_device_add_data(pdev, pdata, pdata_len);
681 ret = omap_early_device_register(pdev);
683 ret = omap_device_register(pdev);
690 omap_device_delete(od);
692 platform_device_put(pdev);
695 pr_err("omap_device: %s: build failed (%d)\n", pdev_name, ret);
701 * omap_early_device_register - register an omap_device as an early platform
703 * @od: struct omap_device * to register
705 * Register the omap_device structure. This currently just calls
706 * platform_early_add_device() on the underlying platform_device.
707 * Returns 0 by default.
709 static int __init omap_early_device_register(struct platform_device *pdev)
711 struct platform_device *devices[1];
714 early_platform_add_devices(devices, 1);
718 #ifdef CONFIG_PM_RUNTIME
719 static int _od_runtime_suspend(struct device *dev)
721 struct platform_device *pdev = to_platform_device(dev);
724 ret = pm_generic_runtime_suspend(dev);
727 omap_device_idle(pdev);
732 static int _od_runtime_idle(struct device *dev)
734 return pm_generic_runtime_idle(dev);
737 static int _od_runtime_resume(struct device *dev)
739 struct platform_device *pdev = to_platform_device(dev);
741 omap_device_enable(pdev);
743 return pm_generic_runtime_resume(dev);
747 #ifdef CONFIG_SUSPEND
748 static int _od_suspend_noirq(struct device *dev)
750 struct platform_device *pdev = to_platform_device(dev);
751 struct omap_device *od = to_omap_device(pdev);
754 /* Don't attempt late suspend on a driver that is not bound */
755 if (od->_driver_status != BUS_NOTIFY_BOUND_DRIVER)
758 ret = pm_generic_suspend_noirq(dev);
760 if (!ret && !pm_runtime_status_suspended(dev)) {
761 if (pm_generic_runtime_suspend(dev) == 0) {
762 if (!(od->flags & OMAP_DEVICE_NO_IDLE_ON_SUSPEND))
763 omap_device_idle(pdev);
764 od->flags |= OMAP_DEVICE_SUSPENDED;
771 static int _od_resume_noirq(struct device *dev)
773 struct platform_device *pdev = to_platform_device(dev);
774 struct omap_device *od = to_omap_device(pdev);
776 if ((od->flags & OMAP_DEVICE_SUSPENDED) &&
777 !pm_runtime_status_suspended(dev)) {
778 od->flags &= ~OMAP_DEVICE_SUSPENDED;
779 if (!(od->flags & OMAP_DEVICE_NO_IDLE_ON_SUSPEND))
780 omap_device_enable(pdev);
781 pm_generic_runtime_resume(dev);
784 return pm_generic_resume_noirq(dev);
787 #define _od_suspend_noirq NULL
788 #define _od_resume_noirq NULL
791 struct dev_pm_domain omap_device_pm_domain = {
793 SET_RUNTIME_PM_OPS(_od_runtime_suspend, _od_runtime_resume,
795 USE_PLATFORM_PM_SLEEP_OPS
796 .suspend_noirq = _od_suspend_noirq,
797 .resume_noirq = _od_resume_noirq,
802 * omap_device_register - register an omap_device with one omap_hwmod
803 * @od: struct omap_device * to register
805 * Register the omap_device structure. This currently just calls
806 * platform_device_register() on the underlying platform_device.
807 * Returns the return value of platform_device_register().
809 int omap_device_register(struct platform_device *pdev)
811 pr_debug("omap_device: %s: registering\n", pdev->name);
813 pdev->dev.pm_domain = &omap_device_pm_domain;
814 return platform_device_add(pdev);
818 /* Public functions for use by device drivers through struct platform_data */
821 * omap_device_enable - fully activate an omap_device
822 * @od: struct omap_device * to activate
824 * Do whatever is necessary for the hwmods underlying omap_device @od
825 * to be accessible and ready to operate. This generally involves
826 * enabling clocks, setting SYSCONFIG registers; and in the future may
827 * involve remuxing pins. Device drivers should call this function
828 * (through platform_data function pointers) where they would normally
829 * enable clocks, etc. Returns -EINVAL if called when the omap_device
830 * is already enabled, or passes along the return value of
831 * _omap_device_activate().
833 int omap_device_enable(struct platform_device *pdev)
836 struct omap_device *od;
838 od = to_omap_device(pdev);
840 if (od->_state == OMAP_DEVICE_STATE_ENABLED) {
842 "omap_device: %s() called from invalid state %d\n",
843 __func__, od->_state);
847 /* Enable everything if we're enabling this device from scratch */
848 if (od->_state == OMAP_DEVICE_STATE_UNKNOWN)
849 od->pm_lat_level = od->pm_lats_cnt;
851 ret = _omap_device_activate(od, IGNORE_WAKEUP_LAT);
853 od->dev_wakeup_lat = 0;
854 od->_dev_wakeup_lat_limit = UINT_MAX;
855 od->_state = OMAP_DEVICE_STATE_ENABLED;
861 * omap_device_idle - idle an omap_device
862 * @od: struct omap_device * to idle
864 * Idle omap_device @od by calling as many .deactivate_func() entries
865 * in the omap_device's pm_lats table as is possible without exceeding
866 * the device's maximum wakeup latency limit, pm_lat_limit. Device
867 * drivers should call this function (through platform_data function
868 * pointers) where they would normally disable clocks after operations
869 * complete, etc.. Returns -EINVAL if the omap_device is not
870 * currently enabled, or passes along the return value of
871 * _omap_device_deactivate().
873 int omap_device_idle(struct platform_device *pdev)
876 struct omap_device *od;
878 od = to_omap_device(pdev);
880 if (od->_state != OMAP_DEVICE_STATE_ENABLED) {
882 "omap_device: %s() called from invalid state %d\n",
883 __func__, od->_state);
887 ret = _omap_device_deactivate(od, USE_WAKEUP_LAT);
889 od->_state = OMAP_DEVICE_STATE_IDLE;
895 * omap_device_shutdown - shut down an omap_device
896 * @od: struct omap_device * to shut down
898 * Shut down omap_device @od by calling all .deactivate_func() entries
899 * in the omap_device's pm_lats table and then shutting down all of
900 * the underlying omap_hwmods. Used when a device is being "removed"
901 * or a device driver is being unloaded. Returns -EINVAL if the
902 * omap_device is not currently enabled or idle, or passes along the
903 * return value of _omap_device_deactivate().
905 int omap_device_shutdown(struct platform_device *pdev)
908 struct omap_device *od;
910 od = to_omap_device(pdev);
912 if (od->_state != OMAP_DEVICE_STATE_ENABLED &&
913 od->_state != OMAP_DEVICE_STATE_IDLE) {
915 "omap_device: %s() called from invalid state %d\n",
916 __func__, od->_state);
920 ret = _omap_device_deactivate(od, IGNORE_WAKEUP_LAT);
922 for (i = 0; i < od->hwmods_cnt; i++)
923 omap_hwmod_shutdown(od->hwmods[i]);
925 od->_state = OMAP_DEVICE_STATE_SHUTDOWN;
931 * omap_device_align_pm_lat - activate/deactivate device to match wakeup lat lim
932 * @od: struct omap_device *
934 * When a device's maximum wakeup latency limit changes, call some of
935 * the .activate_func or .deactivate_func function pointers in the
936 * omap_device's pm_lats array to ensure that the device's maximum
937 * wakeup latency is less than or equal to the new latency limit.
938 * Intended to be called by OMAP PM code whenever a device's maximum
939 * wakeup latency limit changes (e.g., via
940 * omap_pm_set_dev_wakeup_lat()). Returns 0 if nothing needs to be
941 * done (e.g., if the omap_device is not currently idle, or if the
942 * wakeup latency is already current with the new limit) or passes
943 * along the return value of _omap_device_deactivate() or
944 * _omap_device_activate().
946 int omap_device_align_pm_lat(struct platform_device *pdev,
947 u32 new_wakeup_lat_limit)
950 struct omap_device *od;
952 od = to_omap_device(pdev);
954 if (new_wakeup_lat_limit == od->dev_wakeup_lat)
957 od->_dev_wakeup_lat_limit = new_wakeup_lat_limit;
959 if (od->_state != OMAP_DEVICE_STATE_IDLE)
961 else if (new_wakeup_lat_limit > od->dev_wakeup_lat)
962 ret = _omap_device_deactivate(od, USE_WAKEUP_LAT);
963 else if (new_wakeup_lat_limit < od->dev_wakeup_lat)
964 ret = _omap_device_activate(od, USE_WAKEUP_LAT);
970 * omap_device_get_pwrdm - return the powerdomain * associated with @od
971 * @od: struct omap_device *
973 * Return the powerdomain associated with the first underlying
974 * omap_hwmod for this omap_device. Intended for use by core OMAP PM
975 * code. Returns NULL on error or a struct powerdomain * upon
978 struct powerdomain *omap_device_get_pwrdm(struct omap_device *od)
981 * XXX Assumes that all omap_hwmod powerdomains are identical.
982 * This may not necessarily be true. There should be a sanity
983 * check in here to WARN() if any difference appears.
988 return omap_hwmod_get_pwrdm(od->hwmods[0]);
992 * omap_device_get_mpu_rt_va - return the MPU's virtual addr for the hwmod base
993 * @od: struct omap_device *
995 * Return the MPU's virtual address for the base of the hwmod, from
996 * the ioremap() that the hwmod code does. Only valid if there is one
997 * hwmod associated with this device. Returns NULL if there are zero
998 * or more than one hwmods associated with this omap_device;
999 * otherwise, passes along the return value from
1000 * omap_hwmod_get_mpu_rt_va().
1002 void __iomem *omap_device_get_rt_va(struct omap_device *od)
1004 if (od->hwmods_cnt != 1)
1007 return omap_hwmod_get_mpu_rt_va(od->hwmods[0]);
1011 * omap_device_get_by_hwmod_name() - convert a hwmod name to
1013 * @oh_name: name of the hwmod device
1015 * Returns back a struct device * pointer associated with a hwmod
1016 * device represented by a hwmod_name
1018 struct device *omap_device_get_by_hwmod_name(const char *oh_name)
1020 struct omap_hwmod *oh;
1023 WARN(1, "%s: no hwmod name!\n", __func__);
1024 return ERR_PTR(-EINVAL);
1027 oh = omap_hwmod_lookup(oh_name);
1028 if (IS_ERR_OR_NULL(oh)) {
1029 WARN(1, "%s: no hwmod for %s\n", __func__,
1031 return ERR_PTR(oh ? PTR_ERR(oh) : -ENODEV);
1033 if (IS_ERR_OR_NULL(oh->od)) {
1034 WARN(1, "%s: no omap_device for %s\n", __func__,
1036 return ERR_PTR(oh->od ? PTR_ERR(oh->od) : -ENODEV);
1039 if (IS_ERR_OR_NULL(oh->od->pdev))
1040 return ERR_PTR(oh->od->pdev ? PTR_ERR(oh->od->pdev) : -ENODEV);
1042 return &oh->od->pdev->dev;
1044 EXPORT_SYMBOL(omap_device_get_by_hwmod_name);
1047 * Public functions intended for use in omap_device_pm_latency
1048 * .activate_func and .deactivate_func function pointers
1052 * omap_device_enable_hwmods - call omap_hwmod_enable() on all hwmods
1053 * @od: struct omap_device *od
1055 * Enable all underlying hwmods. Returns 0.
1057 int omap_device_enable_hwmods(struct omap_device *od)
1061 for (i = 0; i < od->hwmods_cnt; i++)
1062 omap_hwmod_enable(od->hwmods[i]);
1064 /* XXX pass along return value here? */
1069 * omap_device_idle_hwmods - call omap_hwmod_idle() on all hwmods
1070 * @od: struct omap_device *od
1072 * Idle all underlying hwmods. Returns 0.
1074 int omap_device_idle_hwmods(struct omap_device *od)
1078 for (i = 0; i < od->hwmods_cnt; i++)
1079 omap_hwmod_idle(od->hwmods[i]);
1081 /* XXX pass along return value here? */
1086 * omap_device_disable_clocks - disable all main and interface clocks
1087 * @od: struct omap_device *od
1089 * Disable the main functional clock and interface clock for all of the
1090 * omap_hwmods associated with the omap_device. Returns 0.
1092 int omap_device_disable_clocks(struct omap_device *od)
1096 for (i = 0; i < od->hwmods_cnt; i++)
1097 omap_hwmod_disable_clocks(od->hwmods[i]);
1099 /* XXX pass along return value here? */
1104 * omap_device_enable_clocks - enable all main and interface clocks
1105 * @od: struct omap_device *od
1107 * Enable the main functional clock and interface clock for all of the
1108 * omap_hwmods associated with the omap_device. Returns 0.
1110 int omap_device_enable_clocks(struct omap_device *od)
1114 for (i = 0; i < od->hwmods_cnt; i++)
1115 omap_hwmod_enable_clocks(od->hwmods[i]);
1117 /* XXX pass along return value here? */
1121 static struct notifier_block platform_nb = {
1122 .notifier_call = _omap_device_notifier_call,
1125 static int __init omap_device_init(void)
1127 bus_register_notifier(&platform_bus_type, &platform_nb);
1130 core_initcall(omap_device_init);
1133 * omap_device_late_idle - idle devices without drivers
1134 * @dev: struct device * associated with omap_device
1137 * Check the driver bound status of this device, and idle it
1138 * if there is no driver attached.
1140 static int __init omap_device_late_idle(struct device *dev, void *data)
1142 struct platform_device *pdev = to_platform_device(dev);
1143 struct omap_device *od = to_omap_device(pdev);
1149 * If omap_device state is enabled, but has no driver bound,
1152 if (od->_driver_status != BUS_NOTIFY_BOUND_DRIVER) {
1153 if (od->_state == OMAP_DEVICE_STATE_ENABLED) {
1154 dev_warn(dev, "%s: enabled but no driver. Idling\n",
1156 omap_device_idle(pdev);
1163 static int __init omap_device_late_init(void)
1165 bus_for_each_dev(&platform_bus_type, NULL, NULL, omap_device_late_idle);
1168 late_initcall(omap_device_late_init);