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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_runtime.h>
 36 #include <linux/of.h>
 37 #include <linux/notifier.h>
 38 
 39 #include "common.h"
 40 #include "soc.h"
 41 #include "omap_device.h"
 42 #include "omap_hwmod.h"
 43 
 44 /* Private functions */
 45 
 46 static void _add_clkdev(struct omap_device *od, const char *clk_alias,
 47                        const char *clk_name)
 48 {
 49         struct clk *r;
 50         struct clk_lookup *l;
 51 
 52         if (!clk_alias || !clk_name)
 53                 return;
 54 
 55         dev_dbg(&od->pdev->dev, "Creating %s -> %s\n", clk_alias, clk_name);
 56 
 57         r = clk_get_sys(dev_name(&od->pdev->dev), clk_alias);
 58         if (!IS_ERR(r)) {
 59                 dev_dbg(&od->pdev->dev,
 60                          "alias %s already exists\n", clk_alias);
 61                 clk_put(r);
 62                 return;
 63         }
 64 
 65         r = clk_get(NULL, clk_name);
 66         if (IS_ERR(r)) {
 67                 dev_err(&od->pdev->dev,
 68                         "clk_get for %s failed\n", clk_name);
 69                 return;
 70         }
 71 
 72         l = clkdev_alloc(r, clk_alias, dev_name(&od->pdev->dev));
 73         if (!l) {
 74                 dev_err(&od->pdev->dev,
 75                         "clkdev_alloc for %s failed\n", clk_alias);
 76                 return;
 77         }
 78 
 79         clkdev_add(l);
 80 }
 81 
 82 /**
 83  * _add_hwmod_clocks_clkdev - Add clkdev entry for hwmod optional clocks
 84  * and main clock
 85  * @od: struct omap_device *od
 86  * @oh: struct omap_hwmod *oh
 87  *
 88  * For the main clock and every optional clock present per hwmod per
 89  * omap_device, this function adds an entry in the clkdev table of the
 90  * form <dev-id=dev_name, con-id=role> if it does not exist already.
 91  *
 92  * The function is called from inside omap_device_build_ss(), after
 93  * omap_device_register.
 94  *
 95  * This allows drivers to get a pointer to its optional clocks based on its role
 96  * by calling clk_get(<dev*>, <role>).
 97  * In the case of the main clock, a "fck" alias is used.
 98  *
 99  * No return value.
100  */
101 static void _add_hwmod_clocks_clkdev(struct omap_device *od,
102                                      struct omap_hwmod *oh)
103 {
104         int i;
105 
106         _add_clkdev(od, "fck", oh->main_clk);
107 
108         for (i = 0; i < oh->opt_clks_cnt; i++)
109                 _add_clkdev(od, oh->opt_clks[i].role, oh->opt_clks[i].clk);
110 }
111 
112 
113 /**
114  * omap_device_build_from_dt - build an omap_device with multiple hwmods
115  * @pdev_name: name of the platform_device driver to use
116  * @pdev_id: this platform_device's connection ID
117  * @oh: ptr to the single omap_hwmod that backs this omap_device
118  * @pdata: platform_data ptr to associate with the platform_device
119  * @pdata_len: amount of memory pointed to by @pdata
120  *
121  * Function for building an omap_device already registered from device-tree
122  *
123  * Returns 0 or PTR_ERR() on error.
124  */
125 static int omap_device_build_from_dt(struct platform_device *pdev)
126 {
127         struct omap_hwmod **hwmods;
128         struct omap_device *od;
129         struct omap_hwmod *oh;
130         struct device_node *node = pdev->dev.of_node;
131         const char *oh_name;
132         int oh_cnt, i, ret = 0;
133         bool device_active = false;
134 
135         oh_cnt = of_property_count_strings(node, "ti,hwmods");
136         if (oh_cnt <= 0) {
137                 dev_dbg(&pdev->dev, "No 'hwmods' to build omap_device\n");
138                 return -ENODEV;
139         }
140 
141         hwmods = kzalloc(sizeof(struct omap_hwmod *) * oh_cnt, GFP_KERNEL);
142         if (!hwmods) {
143                 ret = -ENOMEM;
144                 goto odbfd_exit;
145         }
146 
147         for (i = 0; i < oh_cnt; i++) {
148                 of_property_read_string_index(node, "ti,hwmods", i, &oh_name);
149                 oh = omap_hwmod_lookup(oh_name);
150                 if (!oh) {
151                         dev_err(&pdev->dev, "Cannot lookup hwmod '%s'\n",
152                                 oh_name);
153                         ret = -EINVAL;
154                         goto odbfd_exit1;
155                 }
156                 hwmods[i] = oh;
157                 if (oh->flags & HWMOD_INIT_NO_IDLE)
158                         device_active = true;
159         }
160 
161         od = omap_device_alloc(pdev, hwmods, oh_cnt);
162         if (IS_ERR(od)) {
163                 dev_err(&pdev->dev, "Cannot allocate omap_device for :%s\n",
164                         oh_name);
165                 ret = PTR_ERR(od);
166                 goto odbfd_exit1;
167         }
168 
169         /* Fix up missing resource names */
170         for (i = 0; i < pdev->num_resources; i++) {
171                 struct resource *r = &pdev->resource[i];
172 
173                 if (r->name == NULL)
174                         r->name = dev_name(&pdev->dev);
175         }
176 
177         pdev->dev.pm_domain = &omap_device_pm_domain;
178 
179         if (device_active) {
180                 omap_device_enable(pdev);
181                 pm_runtime_set_active(&pdev->dev);
182         }
183 
184 odbfd_exit1:
185         kfree(hwmods);
186 odbfd_exit:
187         /* if data/we are at fault.. load up a fail handler */
188         if (ret)
189                 pdev->dev.pm_domain = &omap_device_fail_pm_domain;
190 
191         return ret;
192 }
193 
194 static int _omap_device_notifier_call(struct notifier_block *nb,
195                                       unsigned long event, void *dev)
196 {
197         struct platform_device *pdev = to_platform_device(dev);
198         struct omap_device *od;
199 
200         switch (event) {
201         case BUS_NOTIFY_DEL_DEVICE:
202                 if (pdev->archdata.od)
203                         omap_device_delete(pdev->archdata.od);
204                 break;
205         case BUS_NOTIFY_ADD_DEVICE:
206                 if (pdev->dev.of_node)
207                         omap_device_build_from_dt(pdev);
208                 omap_auxdata_legacy_init(dev);
209                 /* fall through */
210         default:
211                 od = to_omap_device(pdev);
212                 if (od)
213                         od->_driver_status = event;
214         }
215 
216         return NOTIFY_DONE;
217 }
218 
219 /**
220  * _omap_device_enable_hwmods - call omap_hwmod_enable() on all hwmods
221  * @od: struct omap_device *od
222  *
223  * Enable all underlying hwmods.  Returns 0.
224  */
225 static int _omap_device_enable_hwmods(struct omap_device *od)
226 {
227         int i;
228 
229         for (i = 0; i < od->hwmods_cnt; i++)
230                 omap_hwmod_enable(od->hwmods[i]);
231 
232         /* XXX pass along return value here? */
233         return 0;
234 }
235 
236 /**
237  * _omap_device_idle_hwmods - call omap_hwmod_idle() on all hwmods
238  * @od: struct omap_device *od
239  *
240  * Idle all underlying hwmods.  Returns 0.
241  */
242 static int _omap_device_idle_hwmods(struct omap_device *od)
243 {
244         int i;
245 
246         for (i = 0; i < od->hwmods_cnt; i++)
247                 omap_hwmod_idle(od->hwmods[i]);
248 
249         /* XXX pass along return value here? */
250         return 0;
251 }
252 
253 /* Public functions for use by core code */
254 
255 /**
256  * omap_device_get_context_loss_count - get lost context count
257  * @od: struct omap_device *
258  *
259  * Using the primary hwmod, query the context loss count for this
260  * device.
261  *
262  * Callers should consider context for this device lost any time this
263  * function returns a value different than the value the caller got
264  * the last time it called this function.
265  *
266  * If any hwmods exist for the omap_device assoiated with @pdev,
267  * return the context loss counter for that hwmod, otherwise return
268  * zero.
269  */
270 int omap_device_get_context_loss_count(struct platform_device *pdev)
271 {
272         struct omap_device *od;
273         u32 ret = 0;
274 
275         od = to_omap_device(pdev);
276 
277         if (od->hwmods_cnt)
278                 ret = omap_hwmod_get_context_loss_count(od->hwmods[0]);
279 
280         return ret;
281 }
282 
283 /**
284  * omap_device_count_resources - count number of struct resource entries needed
285  * @od: struct omap_device *
286  * @flags: Type of resources to include when counting (IRQ/DMA/MEM)
287  *
288  * Count the number of struct resource entries needed for this
289  * omap_device @od.  Used by omap_device_build_ss() to determine how
290  * much memory to allocate before calling
291  * omap_device_fill_resources().  Returns the count.
292  */
293 static int omap_device_count_resources(struct omap_device *od,
294                                        unsigned long flags)
295 {
296         int c = 0;
297         int i;
298 
299         for (i = 0; i < od->hwmods_cnt; i++)
300                 c += omap_hwmod_count_resources(od->hwmods[i], flags);
301 
302         pr_debug("omap_device: %s: counted %d total resources across %d hwmods\n",
303                  od->pdev->name, c, od->hwmods_cnt);
304 
305         return c;
306 }
307 
308 /**
309  * omap_device_fill_resources - fill in array of struct resource
310  * @od: struct omap_device *
311  * @res: pointer to an array of struct resource to be filled in
312  *
313  * Populate one or more empty struct resource pointed to by @res with
314  * the resource data for this omap_device @od.  Used by
315  * omap_device_build_ss() after calling omap_device_count_resources().
316  * Ideally this function would not be needed at all.  If omap_device
317  * replaces platform_device, then we can specify our own
318  * get_resource()/ get_irq()/etc functions that use the underlying
319  * omap_hwmod information.  Or if platform_device is extended to use
320  * subarchitecture-specific function pointers, the various
321  * platform_device functions can simply call omap_device internal
322  * functions to get device resources.  Hacking around the existing
323  * platform_device code wastes memory.  Returns 0.
324  */
325 static int omap_device_fill_resources(struct omap_device *od,
326                                       struct resource *res)
327 {
328         int i, r;
329 
330         for (i = 0; i < od->hwmods_cnt; i++) {
331                 r = omap_hwmod_fill_resources(od->hwmods[i], res);
332                 res += r;
333         }
334 
335         return 0;
336 }
337 
338 /**
339  * _od_fill_dma_resources - fill in array of struct resource with dma resources
340  * @od: struct omap_device *
341  * @res: pointer to an array of struct resource to be filled in
342  *
343  * Populate one or more empty struct resource pointed to by @res with
344  * the dma resource data for this omap_device @od.  Used by
345  * omap_device_alloc() after calling omap_device_count_resources().
346  *
347  * Ideally this function would not be needed at all.  If we have
348  * mechanism to get dma resources from DT.
349  *
350  * Returns 0.
351  */
352 static int _od_fill_dma_resources(struct omap_device *od,
353                                       struct resource *res)
354 {
355         int i, r;
356 
357         for (i = 0; i < od->hwmods_cnt; i++) {
358                 r = omap_hwmod_fill_dma_resources(od->hwmods[i], res);
359                 res += r;
360         }
361 
362         return 0;
363 }
364 
365 /**
366  * omap_device_alloc - allocate an omap_device
367  * @pdev: platform_device that will be included in this omap_device
368  * @oh: ptr to the single omap_hwmod that backs this omap_device
369  * @pdata: platform_data ptr to associate with the platform_device
370  * @pdata_len: amount of memory pointed to by @pdata
371  *
372  * Convenience function for allocating an omap_device structure and filling
373  * hwmods, and resources.
374  *
375  * Returns an struct omap_device pointer or ERR_PTR() on error;
376  */
377 struct omap_device *omap_device_alloc(struct platform_device *pdev,
378                                         struct omap_hwmod **ohs, int oh_cnt)
379 {
380         int ret = -ENOMEM;
381         struct omap_device *od;
382         struct resource *res = NULL;
383         int i, res_count;
384         struct omap_hwmod **hwmods;
385 
386         od = kzalloc(sizeof(struct omap_device), GFP_KERNEL);
387         if (!od) {
388                 ret = -ENOMEM;
389                 goto oda_exit1;
390         }
391         od->hwmods_cnt = oh_cnt;
392 
393         hwmods = kmemdup(ohs, sizeof(struct omap_hwmod *) * oh_cnt, GFP_KERNEL);
394         if (!hwmods)
395                 goto oda_exit2;
396 
397         od->hwmods = hwmods;
398         od->pdev = pdev;
399 
400         /*
401          * Non-DT Boot:
402          *   Here, pdev->num_resources = 0, and we should get all the
403          *   resources from hwmod.
404          *
405          * DT Boot:
406          *   OF framework will construct the resource structure (currently
407          *   does for MEM & IRQ resource) and we should respect/use these
408          *   resources, killing hwmod dependency.
409          *   If pdev->num_resources > 0, we assume that MEM & IRQ resources
410          *   have been allocated by OF layer already (through DTB).
411          *   As preparation for the future we examine the OF provided resources
412          *   to see if we have DMA resources provided already. In this case
413          *   there is no need to update the resources for the device, we use the
414          *   OF provided ones.
415          *
416          * TODO: Once DMA resource is available from OF layer, we should
417          *   kill filling any resources from hwmod.
418          */
419         if (!pdev->num_resources) {
420                 /* Count all resources for the device */
421                 res_count = omap_device_count_resources(od, IORESOURCE_IRQ |
422                                                             IORESOURCE_DMA |
423                                                             IORESOURCE_MEM);
424         } else {
425                 /* Take a look if we already have DMA resource via DT */
426                 for (i = 0; i < pdev->num_resources; i++) {
427                         struct resource *r = &pdev->resource[i];
428 
429                         /* We have it, no need to touch the resources */
430                         if (r->flags == IORESOURCE_DMA)
431                                 goto have_everything;
432                 }
433                 /* Count only DMA resources for the device */
434                 res_count = omap_device_count_resources(od, IORESOURCE_DMA);
435                 /* The device has no DMA resource, no need for update */
436                 if (!res_count)
437                         goto have_everything;
438 
439                 res_count += pdev->num_resources;
440         }
441 
442         /* Allocate resources memory to account for new resources */
443         res = kzalloc(sizeof(struct resource) * res_count, GFP_KERNEL);
444         if (!res)
445                 goto oda_exit3;
446 
447         if (!pdev->num_resources) {
448                 dev_dbg(&pdev->dev, "%s: using %d resources from hwmod\n",
449                         __func__, res_count);
450                 omap_device_fill_resources(od, res);
451         } else {
452                 dev_dbg(&pdev->dev,
453                         "%s: appending %d DMA resources from hwmod\n",
454                         __func__, res_count - pdev->num_resources);
455                 memcpy(res, pdev->resource,
456                        sizeof(struct resource) * pdev->num_resources);
457                 _od_fill_dma_resources(od, &res[pdev->num_resources]);
458         }
459 
460         ret = platform_device_add_resources(pdev, res, res_count);
461         kfree(res);
462 
463         if (ret)
464                 goto oda_exit3;
465 
466 have_everything:
467         pdev->archdata.od = od;
468 
469         for (i = 0; i < oh_cnt; i++) {
470                 hwmods[i]->od = od;
471                 _add_hwmod_clocks_clkdev(od, hwmods[i]);
472         }
473 
474         return od;
475 
476 oda_exit3:
477         kfree(hwmods);
478 oda_exit2:
479         kfree(od);
480 oda_exit1:
481         dev_err(&pdev->dev, "omap_device: build failed (%d)\n", ret);
482 
483         return ERR_PTR(ret);
484 }
485 
486 void omap_device_delete(struct omap_device *od)
487 {
488         if (!od)
489                 return;
490 
491         od->pdev->archdata.od = NULL;
492         kfree(od->hwmods);
493         kfree(od);
494 }
495 
496 /**
497  * omap_device_build - build and register an omap_device with one omap_hwmod
498  * @pdev_name: name of the platform_device driver to use
499  * @pdev_id: this platform_device's connection ID
500  * @oh: ptr to the single omap_hwmod that backs this omap_device
501  * @pdata: platform_data ptr to associate with the platform_device
502  * @pdata_len: amount of memory pointed to by @pdata
503  *
504  * Convenience function for building and registering a single
505  * omap_device record, which in turn builds and registers a
506  * platform_device record.  See omap_device_build_ss() for more
507  * information.  Returns ERR_PTR(-EINVAL) if @oh is NULL; otherwise,
508  * passes along the return value of omap_device_build_ss().
509  */
510 struct platform_device __init *omap_device_build(const char *pdev_name,
511                                                  int pdev_id,
512                                                  struct omap_hwmod *oh,
513                                                  void *pdata, int pdata_len)
514 {
515         struct omap_hwmod *ohs[] = { oh };
516 
517         if (!oh)
518                 return ERR_PTR(-EINVAL);
519 
520         return omap_device_build_ss(pdev_name, pdev_id, ohs, 1, pdata,
521                                     pdata_len);
522 }
523 
524 /**
525  * omap_device_build_ss - build and register an omap_device with multiple hwmods
526  * @pdev_name: name of the platform_device driver to use
527  * @pdev_id: this platform_device's connection ID
528  * @oh: ptr to the single omap_hwmod that backs this omap_device
529  * @pdata: platform_data ptr to associate with the platform_device
530  * @pdata_len: amount of memory pointed to by @pdata
531  *
532  * Convenience function for building and registering an omap_device
533  * subsystem record.  Subsystem records consist of multiple
534  * omap_hwmods.  This function in turn builds and registers a
535  * platform_device record.  Returns an ERR_PTR() on error, or passes
536  * along the return value of omap_device_register().
537  */
538 struct platform_device __init *omap_device_build_ss(const char *pdev_name,
539                                                     int pdev_id,
540                                                     struct omap_hwmod **ohs,
541                                                     int oh_cnt, void *pdata,
542                                                     int pdata_len)
543 {
544         int ret = -ENOMEM;
545         struct platform_device *pdev;
546         struct omap_device *od;
547 
548         if (!ohs || oh_cnt == 0 || !pdev_name)
549                 return ERR_PTR(-EINVAL);
550 
551         if (!pdata && pdata_len > 0)
552                 return ERR_PTR(-EINVAL);
553 
554         pdev = platform_device_alloc(pdev_name, pdev_id);
555         if (!pdev) {
556                 ret = -ENOMEM;
557                 goto odbs_exit;
558         }
559 
560         /* Set the dev_name early to allow dev_xxx in omap_device_alloc */
561         if (pdev->id != -1)
562                 dev_set_name(&pdev->dev, "%s.%d", pdev->name,  pdev->id);
563         else
564                 dev_set_name(&pdev->dev, "%s", pdev->name);
565 
566         od = omap_device_alloc(pdev, ohs, oh_cnt);
567         if (IS_ERR(od))
568                 goto odbs_exit1;
569 
570         ret = platform_device_add_data(pdev, pdata, pdata_len);
571         if (ret)
572                 goto odbs_exit2;
573 
574         ret = omap_device_register(pdev);
575         if (ret)
576                 goto odbs_exit2;
577 
578         return pdev;
579 
580 odbs_exit2:
581         omap_device_delete(od);
582 odbs_exit1:
583         platform_device_put(pdev);
584 odbs_exit:
585 
586         pr_err("omap_device: %s: build failed (%d)\n", pdev_name, ret);
587 
588         return ERR_PTR(ret);
589 }
590 
591 #ifdef CONFIG_PM
592 static int _od_runtime_suspend(struct device *dev)
593 {
594         struct platform_device *pdev = to_platform_device(dev);
595         int ret;
596 
597         ret = pm_generic_runtime_suspend(dev);
598 
599         if (!ret)
600                 omap_device_idle(pdev);
601 
602         return ret;
603 }
604 
605 static int _od_runtime_resume(struct device *dev)
606 {
607         struct platform_device *pdev = to_platform_device(dev);
608 
609         omap_device_enable(pdev);
610 
611         return pm_generic_runtime_resume(dev);
612 }
613 
614 static int _od_fail_runtime_suspend(struct device *dev)
615 {
616         dev_warn(dev, "%s: FIXME: missing hwmod/omap_dev info\n", __func__);
617         return -ENODEV;
618 }
619 
620 static int _od_fail_runtime_resume(struct device *dev)
621 {
622         dev_warn(dev, "%s: FIXME: missing hwmod/omap_dev info\n", __func__);
623         return -ENODEV;
624 }
625 
626 #endif
627 
628 #ifdef CONFIG_SUSPEND
629 static int _od_suspend_noirq(struct device *dev)
630 {
631         struct platform_device *pdev = to_platform_device(dev);
632         struct omap_device *od = to_omap_device(pdev);
633         int ret;
634 
635         /* Don't attempt late suspend on a driver that is not bound */
636         if (od->_driver_status != BUS_NOTIFY_BOUND_DRIVER)
637                 return 0;
638 
639         ret = pm_generic_suspend_noirq(dev);
640 
641         if (!ret && !pm_runtime_status_suspended(dev)) {
642                 if (pm_generic_runtime_suspend(dev) == 0) {
643                         pm_runtime_set_suspended(dev);
644                         omap_device_idle(pdev);
645                         od->flags |= OMAP_DEVICE_SUSPENDED;
646                 }
647         }
648 
649         return ret;
650 }
651 
652 static int _od_resume_noirq(struct device *dev)
653 {
654         struct platform_device *pdev = to_platform_device(dev);
655         struct omap_device *od = to_omap_device(pdev);
656 
657         if (od->flags & OMAP_DEVICE_SUSPENDED) {
658                 od->flags &= ~OMAP_DEVICE_SUSPENDED;
659                 omap_device_enable(pdev);
660                 /*
661                  * XXX: we run before core runtime pm has resumed itself. At
662                  * this point in time, we just restore the runtime pm state and
663                  * considering symmetric operations in resume, we donot expect
664                  * to fail. If we failed, something changed in core runtime_pm
665                  * framework OR some device driver messed things up, hence, WARN
666                  */
667                 WARN(pm_runtime_set_active(dev),
668                      "Could not set %s runtime state active\n", dev_name(dev));
669                 pm_generic_runtime_resume(dev);
670         }
671 
672         return pm_generic_resume_noirq(dev);
673 }
674 #else
675 #define _od_suspend_noirq NULL
676 #define _od_resume_noirq NULL
677 #endif
678 
679 struct dev_pm_domain omap_device_fail_pm_domain = {
680         .ops = {
681                 SET_RUNTIME_PM_OPS(_od_fail_runtime_suspend,
682                                    _od_fail_runtime_resume, NULL)
683         }
684 };
685 
686 struct dev_pm_domain omap_device_pm_domain = {
687         .ops = {
688                 SET_RUNTIME_PM_OPS(_od_runtime_suspend, _od_runtime_resume,
689                                    NULL)
690                 USE_PLATFORM_PM_SLEEP_OPS
691                 .suspend_noirq = _od_suspend_noirq,
692                 .resume_noirq = _od_resume_noirq,
693                 .freeze_noirq = _od_suspend_noirq,
694                 .thaw_noirq = _od_resume_noirq,
695                 .restore_noirq = _od_resume_noirq,
696         }
697 };
698 
699 /**
700  * omap_device_register - register an omap_device with one omap_hwmod
701  * @od: struct omap_device * to register
702  *
703  * Register the omap_device structure.  This currently just calls
704  * platform_device_register() on the underlying platform_device.
705  * Returns the return value of platform_device_register().
706  */
707 int omap_device_register(struct platform_device *pdev)
708 {
709         pr_debug("omap_device: %s: registering\n", pdev->name);
710 
711         pdev->dev.pm_domain = &omap_device_pm_domain;
712         return platform_device_add(pdev);
713 }
714 
715 
716 /* Public functions for use by device drivers through struct platform_data */
717 
718 /**
719  * omap_device_enable - fully activate an omap_device
720  * @od: struct omap_device * to activate
721  *
722  * Do whatever is necessary for the hwmods underlying omap_device @od
723  * to be accessible and ready to operate.  This generally involves
724  * enabling clocks, setting SYSCONFIG registers; and in the future may
725  * involve remuxing pins.  Device drivers should call this function
726  * indirectly via pm_runtime_get*().  Returns -EINVAL if called when
727  * the omap_device is already enabled, or passes along the return
728  * value of _omap_device_enable_hwmods().
729  */
730 int omap_device_enable(struct platform_device *pdev)
731 {
732         int ret;
733         struct omap_device *od;
734 
735         od = to_omap_device(pdev);
736 
737         if (od->_state == OMAP_DEVICE_STATE_ENABLED) {
738                 dev_warn(&pdev->dev,
739                          "omap_device: %s() called from invalid state %d\n",
740                          __func__, od->_state);
741                 return -EINVAL;
742         }
743 
744         ret = _omap_device_enable_hwmods(od);
745 
746         od->_state = OMAP_DEVICE_STATE_ENABLED;
747 
748         return ret;
749 }
750 
751 /**
752  * omap_device_idle - idle an omap_device
753  * @od: struct omap_device * to idle
754  *
755  * Idle omap_device @od.  Device drivers call this function indirectly
756  * via pm_runtime_put*().  Returns -EINVAL if the omap_device is not
757  * currently enabled, or passes along the return value of
758  * _omap_device_idle_hwmods().
759  */
760 int omap_device_idle(struct platform_device *pdev)
761 {
762         int ret;
763         struct omap_device *od;
764 
765         od = to_omap_device(pdev);
766 
767         if (od->_state != OMAP_DEVICE_STATE_ENABLED) {
768                 dev_warn(&pdev->dev,
769                          "omap_device: %s() called from invalid state %d\n",
770                          __func__, od->_state);
771                 return -EINVAL;
772         }
773 
774         ret = _omap_device_idle_hwmods(od);
775 
776         od->_state = OMAP_DEVICE_STATE_IDLE;
777 
778         return ret;
779 }
780 
781 /**
782  * omap_device_assert_hardreset - set a device's hardreset line
783  * @pdev: struct platform_device * to reset
784  * @name: const char * name of the reset line
785  *
786  * Set the hardreset line identified by @name on the IP blocks
787  * associated with the hwmods backing the platform_device @pdev.  All
788  * of the hwmods associated with @pdev must have the same hardreset
789  * line linked to them for this to work.  Passes along the return value
790  * of omap_hwmod_assert_hardreset() in the event of any failure, or
791  * returns 0 upon success.
792  */
793 int omap_device_assert_hardreset(struct platform_device *pdev, const char *name)
794 {
795         struct omap_device *od = to_omap_device(pdev);
796         int ret = 0;
797         int i;
798 
799         for (i = 0; i < od->hwmods_cnt; i++) {
800                 ret = omap_hwmod_assert_hardreset(od->hwmods[i], name);
801                 if (ret)
802                         break;
803         }
804 
805         return ret;
806 }
807 
808 /**
809  * omap_device_deassert_hardreset - release a device's hardreset line
810  * @pdev: struct platform_device * to reset
811  * @name: const char * name of the reset line
812  *
813  * Release the hardreset line identified by @name on the IP blocks
814  * associated with the hwmods backing the platform_device @pdev.  All
815  * of the hwmods associated with @pdev must have the same hardreset
816  * line linked to them for this to work.  Passes along the return
817  * value of omap_hwmod_deassert_hardreset() in the event of any
818  * failure, or returns 0 upon success.
819  */
820 int omap_device_deassert_hardreset(struct platform_device *pdev,
821                                    const char *name)
822 {
823         struct omap_device *od = to_omap_device(pdev);
824         int ret = 0;
825         int i;
826 
827         for (i = 0; i < od->hwmods_cnt; i++) {
828                 ret = omap_hwmod_deassert_hardreset(od->hwmods[i], name);
829                 if (ret)
830                         break;
831         }
832 
833         return ret;
834 }
835 
836 /**
837  * omap_device_get_by_hwmod_name() - convert a hwmod name to
838  * device pointer.
839  * @oh_name: name of the hwmod device
840  *
841  * Returns back a struct device * pointer associated with a hwmod
842  * device represented by a hwmod_name
843  */
844 struct device *omap_device_get_by_hwmod_name(const char *oh_name)
845 {
846         struct omap_hwmod *oh;
847 
848         if (!oh_name) {
849                 WARN(1, "%s: no hwmod name!\n", __func__);
850                 return ERR_PTR(-EINVAL);
851         }
852 
853         oh = omap_hwmod_lookup(oh_name);
854         if (!oh) {
855                 WARN(1, "%s: no hwmod for %s\n", __func__,
856                         oh_name);
857                 return ERR_PTR(-ENODEV);
858         }
859         if (!oh->od) {
860                 WARN(1, "%s: no omap_device for %s\n", __func__,
861                         oh_name);
862                 return ERR_PTR(-ENODEV);
863         }
864 
865         return &oh->od->pdev->dev;
866 }
867 
868 static struct notifier_block platform_nb = {
869         .notifier_call = _omap_device_notifier_call,
870 };
871 
872 static int __init omap_device_init(void)
873 {
874         bus_register_notifier(&platform_bus_type, &platform_nb);
875         return 0;
876 }
877 omap_core_initcall(omap_device_init);
878 
879 /**
880  * omap_device_late_idle - idle devices without drivers
881  * @dev: struct device * associated with omap_device
882  * @data: unused
883  *
884  * Check the driver bound status of this device, and idle it
885  * if there is no driver attached.
886  */
887 static int __init omap_device_late_idle(struct device *dev, void *data)
888 {
889         struct platform_device *pdev = to_platform_device(dev);
890         struct omap_device *od = to_omap_device(pdev);
891         int i;
892 
893         if (!od)
894                 return 0;
895 
896         /*
897          * If omap_device state is enabled, but has no driver bound,
898          * idle it.
899          */
900 
901         /*
902          * Some devices (like memory controllers) are always kept
903          * enabled, and should not be idled even with no drivers.
904          */
905         for (i = 0; i < od->hwmods_cnt; i++)
906                 if (od->hwmods[i]->flags & HWMOD_INIT_NO_IDLE)
907                         return 0;
908 
909         if (od->_driver_status != BUS_NOTIFY_BOUND_DRIVER) {
910                 if (od->_state == OMAP_DEVICE_STATE_ENABLED) {
911                         dev_warn(dev, "%s: enabled but no driver.  Idling\n",
912                                  __func__);
913                         omap_device_idle(pdev);
914                 }
915         }
916 
917         return 0;
918 }
919 
920 static int __init omap_device_late_init(void)
921 {
922         bus_for_each_dev(&platform_bus_type, NULL, NULL, omap_device_late_idle);
923 
924         WARN(!of_have_populated_dt(),
925                 "legacy booting deprecated, please update to boot with .dts\n");
926 
927         return 0;
928 }
929 omap_late_initcall_sync(omap_device_late_init);
930 

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