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TOMOYO Linux Cross Reference
Linux/arch/arm/mach-omap2/omap_device.c

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  1 /*
  2  * omap_device implementation
  3  *
  4  * Copyright (C) 2009-2010 Nokia Corporation
  5  * Paul Walmsley, Kevin Hilman
  6  *
  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
 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 be implemented as a
 21  * proper omap_bus/omap_device in Linux, no more platform_data func
 22  * pointers
 23  *
 24  *
 25  */
 26 #undef DEBUG
 27 
 28 #include <linux/kernel.h>
 29 #include <linux/platform_device.h>
 30 #include <linux/slab.h>
 31 #include <linux/err.h>
 32 #include <linux/io.h>
 33 #include <linux/clk.h>
 34 #include <linux/clkdev.h>
 35 #include <linux/pm_domain.h>
 36 #include <linux/pm_runtime.h>
 37 #include <linux/of.h>
 38 #include <linux/of_address.h>
 39 #include <linux/of_irq.h>
 40 #include <linux/notifier.h>
 41 
 42 #include "common.h"
 43 #include "soc.h"
 44 #include "omap_device.h"
 45 #include "omap_hwmod.h"
 46 
 47 /* Private functions */
 48 
 49 static void _add_clkdev(struct omap_device *od, const char *clk_alias,
 50                        const char *clk_name)
 51 {
 52         struct clk *r;
 53         int rc;
 54 
 55         if (!clk_alias || !clk_name)
 56                 return;
 57 
 58         dev_dbg(&od->pdev->dev, "Creating %s -> %s\n", clk_alias, clk_name);
 59 
 60         r = clk_get_sys(dev_name(&od->pdev->dev), clk_alias);
 61         if (!IS_ERR(r)) {
 62                 dev_dbg(&od->pdev->dev,
 63                          "alias %s already exists\n", clk_alias);
 64                 clk_put(r);
 65                 return;
 66         }
 67 
 68         r = clk_get_sys(NULL, clk_name);
 69 
 70         if (IS_ERR(r)) {
 71                 struct of_phandle_args clkspec;
 72 
 73                 clkspec.np = of_find_node_by_name(NULL, clk_name);
 74 
 75                 r = of_clk_get_from_provider(&clkspec);
 76 
 77                 rc = clk_register_clkdev(r, clk_alias,
 78                                          dev_name(&od->pdev->dev));
 79         } else {
 80                 rc = clk_add_alias(clk_alias, dev_name(&od->pdev->dev),
 81                                    clk_name, NULL);
 82         }
 83 
 84         if (rc) {
 85                 if (rc == -ENODEV || rc == -ENOMEM)
 86                         dev_err(&od->pdev->dev,
 87                                 "clkdev_alloc for %s failed\n", clk_alias);
 88                 else
 89                         dev_err(&od->pdev->dev,
 90                                 "clk_get for %s failed\n", clk_name);
 91         }
 92 }
 93 
 94 /**
 95  * _add_hwmod_clocks_clkdev - Add clkdev entry for hwmod optional clocks
 96  * and main clock
 97  * @od: struct omap_device *od
 98  * @oh: struct omap_hwmod *oh
 99  *
100  * For the main clock and every optional clock present per hwmod per
101  * omap_device, this function adds an entry in the clkdev table of the
102  * form <dev-id=dev_name, con-id=role> if it does not exist already.
103  *
104  * The function is called from inside omap_device_build_ss(), after
105  * omap_device_register.
106  *
107  * This allows drivers to get a pointer to its optional clocks based on its role
108  * by calling clk_get(<dev*>, <role>).
109  * In the case of the main clock, a "fck" alias is used.
110  *
111  * No return value.
112  */
113 static void _add_hwmod_clocks_clkdev(struct omap_device *od,
114                                      struct omap_hwmod *oh)
115 {
116         int i;
117 
118         _add_clkdev(od, "fck", oh->main_clk);
119 
120         for (i = 0; i < oh->opt_clks_cnt; i++)
121                 _add_clkdev(od, oh->opt_clks[i].role, oh->opt_clks[i].clk);
122 }
123 
124 
125 /**
126  * omap_device_build_from_dt - build an omap_device with multiple hwmods
127  * @pdev_name: name of the platform_device driver to use
128  * @pdev_id: this platform_device's connection ID
129  * @oh: ptr to the single omap_hwmod that backs this omap_device
130  * @pdata: platform_data ptr to associate with the platform_device
131  * @pdata_len: amount of memory pointed to by @pdata
132  *
133  * Function for building an omap_device already registered from device-tree
134  *
135  * Returns 0 or PTR_ERR() on error.
136  */
137 static int omap_device_build_from_dt(struct platform_device *pdev)
138 {
139         struct omap_hwmod **hwmods;
140         struct omap_device *od;
141         struct omap_hwmod *oh;
142         struct device_node *node = pdev->dev.of_node;
143         struct resource res;
144         const char *oh_name;
145         int oh_cnt, i, ret = 0;
146         bool device_active = false, skip_pm_domain = false;
147 
148         oh_cnt = of_property_count_strings(node, "ti,hwmods");
149         if (oh_cnt <= 0) {
150                 dev_dbg(&pdev->dev, "No 'hwmods' to build omap_device\n");
151                 return -ENODEV;
152         }
153 
154         /* SDMA still needs special handling for omap_device_build() */
155         ret = of_property_read_string_index(node, "ti,hwmods", 0, &oh_name);
156         if (!ret && (!strncmp("dma_system", oh_name, 10) ||
157                      !strncmp("dma", oh_name, 3)))
158                 skip_pm_domain = true;
159 
160         /* Use ti-sysc driver instead of omap_device? */
161         if (!skip_pm_domain &&
162             !omap_hwmod_parse_module_range(NULL, node, &res))
163                 return -ENODEV;
164 
165         hwmods = kcalloc(oh_cnt, sizeof(struct omap_hwmod *), GFP_KERNEL);
166         if (!hwmods) {
167                 ret = -ENOMEM;
168                 goto odbfd_exit;
169         }
170 
171         for (i = 0; i < oh_cnt; i++) {
172                 of_property_read_string_index(node, "ti,hwmods", i, &oh_name);
173                 oh = omap_hwmod_lookup(oh_name);
174                 if (!oh) {
175                         dev_err(&pdev->dev, "Cannot lookup hwmod '%s'\n",
176                                 oh_name);
177                         ret = -EINVAL;
178                         goto odbfd_exit1;
179                 }
180                 hwmods[i] = oh;
181                 if (oh->flags & HWMOD_INIT_NO_IDLE)
182                         device_active = true;
183         }
184 
185         od = omap_device_alloc(pdev, hwmods, oh_cnt);
186         if (IS_ERR(od)) {
187                 dev_err(&pdev->dev, "Cannot allocate omap_device for :%s\n",
188                         oh_name);
189                 ret = PTR_ERR(od);
190                 goto odbfd_exit1;
191         }
192 
193         /* Fix up missing resource names */
194         for (i = 0; i < pdev->num_resources; i++) {
195                 struct resource *r = &pdev->resource[i];
196 
197                 if (r->name == NULL)
198                         r->name = dev_name(&pdev->dev);
199         }
200 
201         if (!skip_pm_domain) {
202                 dev_pm_domain_set(&pdev->dev, &omap_device_pm_domain);
203                 if (device_active) {
204                         omap_device_enable(pdev);
205                         pm_runtime_set_active(&pdev->dev);
206                 }
207         }
208 
209 odbfd_exit1:
210         kfree(hwmods);
211 odbfd_exit:
212         /* if data/we are at fault.. load up a fail handler */
213         if (ret)
214                 dev_pm_domain_set(&pdev->dev, &omap_device_fail_pm_domain);
215 
216         return ret;
217 }
218 
219 static int _omap_device_notifier_call(struct notifier_block *nb,
220                                       unsigned long event, void *dev)
221 {
222         struct platform_device *pdev = to_platform_device(dev);
223         struct omap_device *od;
224         int err;
225 
226         switch (event) {
227         case BUS_NOTIFY_REMOVED_DEVICE:
228                 if (pdev->archdata.od)
229                         omap_device_delete(pdev->archdata.od);
230                 break;
231         case BUS_NOTIFY_UNBOUND_DRIVER:
232                 od = to_omap_device(pdev);
233                 if (od && (od->_state == OMAP_DEVICE_STATE_ENABLED)) {
234                         dev_info(dev, "enabled after unload, idling\n");
235                         err = omap_device_idle(pdev);
236                         if (err)
237                                 dev_err(dev, "failed to idle\n");
238                 }
239                 break;
240         case BUS_NOTIFY_BIND_DRIVER:
241                 od = to_omap_device(pdev);
242                 if (od && (od->_state == OMAP_DEVICE_STATE_ENABLED) &&
243                     pm_runtime_status_suspended(dev)) {
244                         od->_driver_status = BUS_NOTIFY_BIND_DRIVER;
245                         pm_runtime_set_active(dev);
246                 }
247                 break;
248         case BUS_NOTIFY_ADD_DEVICE:
249                 if (pdev->dev.of_node)
250                         omap_device_build_from_dt(pdev);
251                 omap_auxdata_legacy_init(dev);
252                 /* fall through */
253         default:
254                 od = to_omap_device(pdev);
255                 if (od)
256                         od->_driver_status = event;
257         }
258 
259         return NOTIFY_DONE;
260 }
261 
262 /**
263  * _omap_device_enable_hwmods - call omap_hwmod_enable() on all hwmods
264  * @od: struct omap_device *od
265  *
266  * Enable all underlying hwmods.  Returns 0.
267  */
268 static int _omap_device_enable_hwmods(struct omap_device *od)
269 {
270         int ret = 0;
271         int i;
272 
273         for (i = 0; i < od->hwmods_cnt; i++)
274                 ret |= omap_hwmod_enable(od->hwmods[i]);
275 
276         return ret;
277 }
278 
279 /**
280  * _omap_device_idle_hwmods - call omap_hwmod_idle() on all hwmods
281  * @od: struct omap_device *od
282  *
283  * Idle all underlying hwmods.  Returns 0.
284  */
285 static int _omap_device_idle_hwmods(struct omap_device *od)
286 {
287         int ret = 0;
288         int i;
289 
290         for (i = 0; i < od->hwmods_cnt; i++)
291                 ret |= omap_hwmod_idle(od->hwmods[i]);
292 
293         return ret;
294 }
295 
296 /* Public functions for use by core code */
297 
298 /**
299  * omap_device_get_context_loss_count - get lost context count
300  * @od: struct omap_device *
301  *
302  * Using the primary hwmod, query the context loss count for this
303  * device.
304  *
305  * Callers should consider context for this device lost any time this
306  * function returns a value different than the value the caller got
307  * the last time it called this function.
308  *
309  * If any hwmods exist for the omap_device associated with @pdev,
310  * return the context loss counter for that hwmod, otherwise return
311  * zero.
312  */
313 int omap_device_get_context_loss_count(struct platform_device *pdev)
314 {
315         struct omap_device *od;
316         u32 ret = 0;
317 
318         od = to_omap_device(pdev);
319 
320         if (od->hwmods_cnt)
321                 ret = omap_hwmod_get_context_loss_count(od->hwmods[0]);
322 
323         return ret;
324 }
325 
326 /**
327  * omap_device_alloc - allocate an omap_device
328  * @pdev: platform_device that will be included in this omap_device
329  * @oh: ptr to the single omap_hwmod that backs this omap_device
330  * @pdata: platform_data ptr to associate with the platform_device
331  * @pdata_len: amount of memory pointed to by @pdata
332  *
333  * Convenience function for allocating an omap_device structure and filling
334  * hwmods, and resources.
335  *
336  * Returns an struct omap_device pointer or ERR_PTR() on error;
337  */
338 struct omap_device *omap_device_alloc(struct platform_device *pdev,
339                                         struct omap_hwmod **ohs, int oh_cnt)
340 {
341         int ret = -ENOMEM;
342         struct omap_device *od;
343         int i;
344         struct omap_hwmod **hwmods;
345 
346         od = kzalloc(sizeof(struct omap_device), GFP_KERNEL);
347         if (!od) {
348                 ret = -ENOMEM;
349                 goto oda_exit1;
350         }
351         od->hwmods_cnt = oh_cnt;
352 
353         hwmods = kmemdup(ohs, sizeof(struct omap_hwmod *) * oh_cnt, GFP_KERNEL);
354         if (!hwmods)
355                 goto oda_exit2;
356 
357         od->hwmods = hwmods;
358         od->pdev = pdev;
359         pdev->archdata.od = od;
360 
361         for (i = 0; i < oh_cnt; i++) {
362                 hwmods[i]->od = od;
363                 _add_hwmod_clocks_clkdev(od, hwmods[i]);
364         }
365 
366         return od;
367 
368 oda_exit2:
369         kfree(od);
370 oda_exit1:
371         dev_err(&pdev->dev, "omap_device: build failed (%d)\n", ret);
372 
373         return ERR_PTR(ret);
374 }
375 
376 void omap_device_delete(struct omap_device *od)
377 {
378         if (!od)
379                 return;
380 
381         od->pdev->archdata.od = NULL;
382         kfree(od->hwmods);
383         kfree(od);
384 }
385 
386 /**
387  * omap_device_copy_resources - Add legacy IO and IRQ resources
388  * @oh: interconnect target module
389  * @pdev: platform device to copy resources to
390  *
391  * We still have legacy DMA and smartreflex needing resources.
392  * Let's populate what they need until we can eventually just
393  * remove this function. Note that there should be no need to
394  * call this from omap_device_build_from_dt(), nor should there
395  * be any need to call it for other devices.
396  */
397 static int
398 omap_device_copy_resources(struct omap_hwmod *oh,
399                            struct platform_device *pdev)
400 {
401         struct device_node *np, *child;
402         struct property *prop;
403         struct resource *res;
404         const char *name;
405         int error, irq = 0;
406 
407         if (!oh || !oh->od || !oh->od->pdev)
408                 return -EINVAL;
409 
410         np = oh->od->pdev->dev.of_node;
411         if (!np) {
412                 error = -ENODEV;
413                 goto error;
414         }
415 
416         res = kcalloc(2, sizeof(*res), GFP_KERNEL);
417         if (!res)
418                 return -ENOMEM;
419 
420         /* Do we have a dts range for the interconnect target module? */
421         error = omap_hwmod_parse_module_range(oh, np, res);
422 
423         /* No ranges, rely on device reg entry */
424         if (error)
425                 error = of_address_to_resource(np, 0, res);
426         if (error)
427                 goto free;
428 
429         /* SmartReflex needs first IO resource name to be "mpu" */
430         res[0].name = "mpu";
431 
432         /*
433          * We may have a configured "ti,sysc" interconnect target with a
434          * dts child with the interrupt. If so use the first child's
435          * first interrupt for "ti-hwmods" legacy support.
436          */
437         of_property_for_each_string(np, "compatible", prop, name)
438                 if (!strncmp("ti,sysc-", name, 8))
439                         break;
440 
441         child = of_get_next_available_child(np, NULL);
442 
443         if (name)
444                 irq = irq_of_parse_and_map(child, 0);
445         if (!irq)
446                 irq = irq_of_parse_and_map(np, 0);
447         if (!irq) {
448                 error = -EINVAL;
449                 goto free;
450         }
451 
452         /* Legacy DMA code needs interrupt name to be "" */
453         res[1].start = irq;
454         res[1].end = irq;
455         res[1].flags = IORESOURCE_IRQ;
456         res[1].name = "";
457 
458         error = platform_device_add_resources(pdev, res, 2);
459 
460 free:
461         kfree(res);
462 
463 error:
464         WARN(error, "%s: %s device %s failed: %i\n",
465              __func__, oh->name, dev_name(&pdev->dev),
466              error);
467 
468         return error;
469 }
470 
471 /**
472  * omap_device_build - build and register an omap_device with one omap_hwmod
473  * @pdev_name: name of the platform_device driver to use
474  * @pdev_id: this platform_device's connection ID
475  * @oh: ptr to the single omap_hwmod that backs this omap_device
476  * @pdata: platform_data ptr to associate with the platform_device
477  * @pdata_len: amount of memory pointed to by @pdata
478  *
479  * Convenience function for building and registering a single
480  * omap_device record, which in turn builds and registers a
481  * platform_device record.  See omap_device_build_ss() for more
482  * information.  Returns ERR_PTR(-EINVAL) if @oh is NULL; otherwise,
483  * passes along the return value of omap_device_build_ss().
484  */
485 struct platform_device __init *omap_device_build(const char *pdev_name,
486                                                  int pdev_id,
487                                                  struct omap_hwmod *oh,
488                                                  void *pdata, int pdata_len)
489 {
490         int ret = -ENOMEM;
491         struct platform_device *pdev;
492         struct omap_device *od;
493 
494         if (!oh || !pdev_name)
495                 return ERR_PTR(-EINVAL);
496 
497         if (!pdata && pdata_len > 0)
498                 return ERR_PTR(-EINVAL);
499 
500         if (strncmp(oh->name, "smartreflex", 11) &&
501             strncmp(oh->name, "dma", 3)) {
502                 pr_warn("%s need to update %s to probe with dt\na",
503                         __func__, pdev_name);
504                 ret = -ENODEV;
505                 goto odbs_exit;
506         }
507 
508         pdev = platform_device_alloc(pdev_name, pdev_id);
509         if (!pdev) {
510                 ret = -ENOMEM;
511                 goto odbs_exit;
512         }
513 
514         /* Set the dev_name early to allow dev_xxx in omap_device_alloc */
515         if (pdev->id != -1)
516                 dev_set_name(&pdev->dev, "%s.%d", pdev->name,  pdev->id);
517         else
518                 dev_set_name(&pdev->dev, "%s", pdev->name);
519 
520         /*
521          * Must be called before omap_device_alloc() as oh->od
522          * only contains the currently registered omap_device
523          * and will get overwritten by omap_device_alloc().
524          */
525         ret = omap_device_copy_resources(oh, pdev);
526         if (ret)
527                 goto odbs_exit1;
528 
529         od = omap_device_alloc(pdev, &oh, 1);
530         if (IS_ERR(od)) {
531                 ret = PTR_ERR(od);
532                 goto odbs_exit1;
533         }
534 
535         ret = platform_device_add_data(pdev, pdata, pdata_len);
536         if (ret)
537                 goto odbs_exit2;
538 
539         ret = omap_device_register(pdev);
540         if (ret)
541                 goto odbs_exit2;
542 
543         return pdev;
544 
545 odbs_exit2:
546         omap_device_delete(od);
547 odbs_exit1:
548         platform_device_put(pdev);
549 odbs_exit:
550 
551         pr_err("omap_device: %s: build failed (%d)\n", pdev_name, ret);
552 
553         return ERR_PTR(ret);
554 }
555 
556 #ifdef CONFIG_PM
557 static int _od_runtime_suspend(struct device *dev)
558 {
559         struct platform_device *pdev = to_platform_device(dev);
560         int ret;
561 
562         ret = pm_generic_runtime_suspend(dev);
563         if (ret)
564                 return ret;
565 
566         return omap_device_idle(pdev);
567 }
568 
569 static int _od_runtime_resume(struct device *dev)
570 {
571         struct platform_device *pdev = to_platform_device(dev);
572         int ret;
573 
574         ret = omap_device_enable(pdev);
575         if (ret) {
576                 dev_err(dev, "use pm_runtime_put_sync_suspend() in driver?\n");
577                 return ret;
578         }
579 
580         return pm_generic_runtime_resume(dev);
581 }
582 
583 static int _od_fail_runtime_suspend(struct device *dev)
584 {
585         dev_warn(dev, "%s: FIXME: missing hwmod/omap_dev info\n", __func__);
586         return -ENODEV;
587 }
588 
589 static int _od_fail_runtime_resume(struct device *dev)
590 {
591         dev_warn(dev, "%s: FIXME: missing hwmod/omap_dev info\n", __func__);
592         return -ENODEV;
593 }
594 
595 #endif
596 
597 #ifdef CONFIG_SUSPEND
598 static int _od_suspend_noirq(struct device *dev)
599 {
600         struct platform_device *pdev = to_platform_device(dev);
601         struct omap_device *od = to_omap_device(pdev);
602         int ret;
603 
604         /* Don't attempt late suspend on a driver that is not bound */
605         if (od->_driver_status != BUS_NOTIFY_BOUND_DRIVER)
606                 return 0;
607 
608         ret = pm_generic_suspend_noirq(dev);
609 
610         if (!ret && !pm_runtime_status_suspended(dev)) {
611                 if (pm_generic_runtime_suspend(dev) == 0) {
612                         omap_device_idle(pdev);
613                         od->flags |= OMAP_DEVICE_SUSPENDED;
614                 }
615         }
616 
617         return ret;
618 }
619 
620 static int _od_resume_noirq(struct device *dev)
621 {
622         struct platform_device *pdev = to_platform_device(dev);
623         struct omap_device *od = to_omap_device(pdev);
624 
625         if (od->flags & OMAP_DEVICE_SUSPENDED) {
626                 od->flags &= ~OMAP_DEVICE_SUSPENDED;
627                 omap_device_enable(pdev);
628                 pm_generic_runtime_resume(dev);
629         }
630 
631         return pm_generic_resume_noirq(dev);
632 }
633 #else
634 #define _od_suspend_noirq NULL
635 #define _od_resume_noirq NULL
636 #endif
637 
638 struct dev_pm_domain omap_device_fail_pm_domain = {
639         .ops = {
640                 SET_RUNTIME_PM_OPS(_od_fail_runtime_suspend,
641                                    _od_fail_runtime_resume, NULL)
642         }
643 };
644 
645 struct dev_pm_domain omap_device_pm_domain = {
646         .ops = {
647                 SET_RUNTIME_PM_OPS(_od_runtime_suspend, _od_runtime_resume,
648                                    NULL)
649                 USE_PLATFORM_PM_SLEEP_OPS
650                 SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(_od_suspend_noirq,
651                                               _od_resume_noirq)
652         }
653 };
654 
655 /**
656  * omap_device_register - register an omap_device with one omap_hwmod
657  * @od: struct omap_device * to register
658  *
659  * Register the omap_device structure.  This currently just calls
660  * platform_device_register() on the underlying platform_device.
661  * Returns the return value of platform_device_register().
662  */
663 int omap_device_register(struct platform_device *pdev)
664 {
665         pr_debug("omap_device: %s: registering\n", pdev->name);
666 
667         dev_pm_domain_set(&pdev->dev, &omap_device_pm_domain);
668         return platform_device_add(pdev);
669 }
670 
671 
672 /* Public functions for use by device drivers through struct platform_data */
673 
674 /**
675  * omap_device_enable - fully activate an omap_device
676  * @od: struct omap_device * to activate
677  *
678  * Do whatever is necessary for the hwmods underlying omap_device @od
679  * to be accessible and ready to operate.  This generally involves
680  * enabling clocks, setting SYSCONFIG registers; and in the future may
681  * involve remuxing pins.  Device drivers should call this function
682  * indirectly via pm_runtime_get*().  Returns -EINVAL if called when
683  * the omap_device is already enabled, or passes along the return
684  * value of _omap_device_enable_hwmods().
685  */
686 int omap_device_enable(struct platform_device *pdev)
687 {
688         int ret;
689         struct omap_device *od;
690 
691         od = to_omap_device(pdev);
692 
693         if (od->_state == OMAP_DEVICE_STATE_ENABLED) {
694                 dev_warn(&pdev->dev,
695                          "omap_device: %s() called from invalid state %d\n",
696                          __func__, od->_state);
697                 return -EINVAL;
698         }
699 
700         ret = _omap_device_enable_hwmods(od);
701 
702         if (ret == 0)
703                 od->_state = OMAP_DEVICE_STATE_ENABLED;
704 
705         return ret;
706 }
707 
708 /**
709  * omap_device_idle - idle an omap_device
710  * @od: struct omap_device * to idle
711  *
712  * Idle omap_device @od.  Device drivers call this function indirectly
713  * via pm_runtime_put*().  Returns -EINVAL if the omap_device is not
714  * currently enabled, or passes along the return value of
715  * _omap_device_idle_hwmods().
716  */
717 int omap_device_idle(struct platform_device *pdev)
718 {
719         int ret;
720         struct omap_device *od;
721 
722         od = to_omap_device(pdev);
723 
724         if (od->_state != OMAP_DEVICE_STATE_ENABLED) {
725                 dev_warn(&pdev->dev,
726                          "omap_device: %s() called from invalid state %d\n",
727                          __func__, od->_state);
728                 return -EINVAL;
729         }
730 
731         ret = _omap_device_idle_hwmods(od);
732 
733         if (ret == 0)
734                 od->_state = OMAP_DEVICE_STATE_IDLE;
735 
736         return ret;
737 }
738 
739 /**
740  * omap_device_assert_hardreset - set a device's hardreset line
741  * @pdev: struct platform_device * to reset
742  * @name: const char * name of the reset line
743  *
744  * Set the hardreset line identified by @name on the IP blocks
745  * associated with the hwmods backing the platform_device @pdev.  All
746  * of the hwmods associated with @pdev must have the same hardreset
747  * line linked to them for this to work.  Passes along the return value
748  * of omap_hwmod_assert_hardreset() in the event of any failure, or
749  * returns 0 upon success.
750  */
751 int omap_device_assert_hardreset(struct platform_device *pdev, const char *name)
752 {
753         struct omap_device *od = to_omap_device(pdev);
754         int ret = 0;
755         int i;
756 
757         for (i = 0; i < od->hwmods_cnt; i++) {
758                 ret = omap_hwmod_assert_hardreset(od->hwmods[i], name);
759                 if (ret)
760                         break;
761         }
762 
763         return ret;
764 }
765 
766 /**
767  * omap_device_deassert_hardreset - release a device's hardreset line
768  * @pdev: struct platform_device * to reset
769  * @name: const char * name of the reset line
770  *
771  * Release the hardreset line identified by @name on the IP blocks
772  * associated with the hwmods backing the platform_device @pdev.  All
773  * of the hwmods associated with @pdev must have the same hardreset
774  * line linked to them for this to work.  Passes along the return
775  * value of omap_hwmod_deassert_hardreset() in the event of any
776  * failure, or returns 0 upon success.
777  */
778 int omap_device_deassert_hardreset(struct platform_device *pdev,
779                                    const char *name)
780 {
781         struct omap_device *od = to_omap_device(pdev);
782         int ret = 0;
783         int i;
784 
785         for (i = 0; i < od->hwmods_cnt; i++) {
786                 ret = omap_hwmod_deassert_hardreset(od->hwmods[i], name);
787                 if (ret)
788                         break;
789         }
790 
791         return ret;
792 }
793 
794 /**
795  * omap_device_get_by_hwmod_name() - convert a hwmod name to
796  * device pointer.
797  * @oh_name: name of the hwmod device
798  *
799  * Returns back a struct device * pointer associated with a hwmod
800  * device represented by a hwmod_name
801  */
802 struct device *omap_device_get_by_hwmod_name(const char *oh_name)
803 {
804         struct omap_hwmod *oh;
805 
806         if (!oh_name) {
807                 WARN(1, "%s: no hwmod name!\n", __func__);
808                 return ERR_PTR(-EINVAL);
809         }
810 
811         oh = omap_hwmod_lookup(oh_name);
812         if (!oh) {
813                 WARN(1, "%s: no hwmod for %s\n", __func__,
814                         oh_name);
815                 return ERR_PTR(-ENODEV);
816         }
817         if (!oh->od) {
818                 WARN(1, "%s: no omap_device for %s\n", __func__,
819                         oh_name);
820                 return ERR_PTR(-ENODEV);
821         }
822 
823         return &oh->od->pdev->dev;
824 }
825 
826 static struct notifier_block platform_nb = {
827         .notifier_call = _omap_device_notifier_call,
828 };
829 
830 static int __init omap_device_init(void)
831 {
832         bus_register_notifier(&platform_bus_type, &platform_nb);
833         return 0;
834 }
835 omap_postcore_initcall(omap_device_init);
836 
837 /**
838  * omap_device_late_idle - idle devices without drivers
839  * @dev: struct device * associated with omap_device
840  * @data: unused
841  *
842  * Check the driver bound status of this device, and idle it
843  * if there is no driver attached.
844  */
845 static int __init omap_device_late_idle(struct device *dev, void *data)
846 {
847         struct platform_device *pdev = to_platform_device(dev);
848         struct omap_device *od = to_omap_device(pdev);
849         int i;
850 
851         if (!od)
852                 return 0;
853 
854         /*
855          * If omap_device state is enabled, but has no driver bound,
856          * idle it.
857          */
858 
859         /*
860          * Some devices (like memory controllers) are always kept
861          * enabled, and should not be idled even with no drivers.
862          */
863         for (i = 0; i < od->hwmods_cnt; i++)
864                 if (od->hwmods[i]->flags & HWMOD_INIT_NO_IDLE)
865                         return 0;
866 
867         if (od->_driver_status != BUS_NOTIFY_BOUND_DRIVER &&
868             od->_driver_status != BUS_NOTIFY_BIND_DRIVER) {
869                 if (od->_state == OMAP_DEVICE_STATE_ENABLED) {
870                         dev_warn(dev, "%s: enabled but no driver.  Idling\n",
871                                  __func__);
872                         omap_device_idle(pdev);
873                 }
874         }
875 
876         return 0;
877 }
878 
879 static int __init omap_device_late_init(void)
880 {
881         bus_for_each_dev(&platform_bus_type, NULL, NULL, omap_device_late_idle);
882 
883         return 0;
884 }
885 omap_late_initcall_sync(omap_device_late_init);
886 

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