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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/notifier.h>
39
40#include "common.h"
41#include "soc.h"
42#include "omap_device.h"
43#include "omap_hwmod.h"
44
45/* Private functions */
46
47static void _add_clkdev(struct omap_device *od, const char *clk_alias,
48 const char *clk_name)
49{
50 struct clk *r;
51 int rc;
52
53 if (!clk_alias || !clk_name)
54 return;
55
56 dev_dbg(&od->pdev->dev, "Creating %s -> %s\n", clk_alias, clk_name);
57
58 r = clk_get_sys(dev_name(&od->pdev->dev), clk_alias);
59 if (!IS_ERR(r)) {
60 dev_dbg(&od->pdev->dev,
61 "alias %s already exists\n", clk_alias);
62 clk_put(r);
63 return;
64 }
65
66 rc = clk_add_alias(clk_alias, dev_name(&od->pdev->dev), clk_name, NULL);
67 if (rc) {
68 if (rc == -ENODEV || rc == -ENOMEM)
69 dev_err(&od->pdev->dev,
70 "clkdev_alloc for %s failed\n", clk_alias);
71 else
72 dev_err(&od->pdev->dev,
73 "clk_get for %s failed\n", clk_name);
74 }
75}
76
77/**
78 * _add_hwmod_clocks_clkdev - Add clkdev entry for hwmod optional clocks
79 * and main clock
80 * @od: struct omap_device *od
81 * @oh: struct omap_hwmod *oh
82 *
83 * For the main clock and every optional clock present per hwmod per
84 * omap_device, this function adds an entry in the clkdev table of the
85 * form <dev-id=dev_name, con-id=role> if it does not exist already.
86 *
87 * The function is called from inside omap_device_build_ss(), after
88 * omap_device_register.
89 *
90 * This allows drivers to get a pointer to its optional clocks based on its role
91 * by calling clk_get(<dev*>, <role>).
92 * In the case of the main clock, a "fck" alias is used.
93 *
94 * No return value.
95 */
96static void _add_hwmod_clocks_clkdev(struct omap_device *od,
97 struct omap_hwmod *oh)
98{
99 int i;
100
101 _add_clkdev(od, "fck", oh->main_clk);
102
103 for (i = 0; i < oh->opt_clks_cnt; i++)
104 _add_clkdev(od, oh->opt_clks[i].role, oh->opt_clks[i].clk);
105}
106
107
108/**
109 * omap_device_build_from_dt - build an omap_device with multiple hwmods
110 * @pdev_name: name of the platform_device driver to use
111 * @pdev_id: this platform_device's connection ID
112 * @oh: ptr to the single omap_hwmod that backs this omap_device
113 * @pdata: platform_data ptr to associate with the platform_device
114 * @pdata_len: amount of memory pointed to by @pdata
115 *
116 * Function for building an omap_device already registered from device-tree
117 *
118 * Returns 0 or PTR_ERR() on error.
119 */
120static int omap_device_build_from_dt(struct platform_device *pdev)
121{
122 struct omap_hwmod **hwmods;
123 struct omap_device *od;
124 struct omap_hwmod *oh;
125 struct device_node *node = pdev->dev.of_node;
126 const char *oh_name;
127 int oh_cnt, i, ret = 0;
128 bool device_active = false;
129
130 oh_cnt = of_property_count_strings(node, "ti,hwmods");
131 if (oh_cnt <= 0) {
132 dev_dbg(&pdev->dev, "No 'hwmods' to build omap_device\n");
133 return -ENODEV;
134 }
135
136 hwmods = kzalloc(sizeof(struct omap_hwmod *) * oh_cnt, GFP_KERNEL);
137 if (!hwmods) {
138 ret = -ENOMEM;
139 goto odbfd_exit;
140 }
141
142 for (i = 0; i < oh_cnt; i++) {
143 of_property_read_string_index(node, "ti,hwmods", i, &oh_name);
144 oh = omap_hwmod_lookup(oh_name);
145 if (!oh) {
146 dev_err(&pdev->dev, "Cannot lookup hwmod '%s'\n",
147 oh_name);
148 ret = -EINVAL;
149 goto odbfd_exit1;
150 }
151 hwmods[i] = oh;
152 if (oh->flags & HWMOD_INIT_NO_IDLE)
153 device_active = true;
154 }
155
156 od = omap_device_alloc(pdev, hwmods, oh_cnt);
157 if (IS_ERR(od)) {
158 dev_err(&pdev->dev, "Cannot allocate omap_device for :%s\n",
159 oh_name);
160 ret = PTR_ERR(od);
161 goto odbfd_exit1;
162 }
163
164 /* Fix up missing resource names */
165 for (i = 0; i < pdev->num_resources; i++) {
166 struct resource *r = &pdev->resource[i];
167
168 if (r->name == NULL)
169 r->name = dev_name(&pdev->dev);
170 }
171
172 dev_pm_domain_set(&pdev->dev, &omap_device_pm_domain);
173
174 if (device_active) {
175 omap_device_enable(pdev);
176 pm_runtime_set_active(&pdev->dev);
177 }
178
179odbfd_exit1:
180 kfree(hwmods);
181odbfd_exit:
182 /* if data/we are at fault.. load up a fail handler */
183 if (ret)
184 dev_pm_domain_set(&pdev->dev, &omap_device_fail_pm_domain);
185
186 return ret;
187}
188
189static int _omap_device_notifier_call(struct notifier_block *nb,
190 unsigned long event, void *dev)
191{
192 struct platform_device *pdev = to_platform_device(dev);
193 struct omap_device *od;
194 int err;
195
196 switch (event) {
197 case BUS_NOTIFY_DEL_DEVICE:
198 if (pdev->archdata.od)
199 omap_device_delete(pdev->archdata.od);
200 break;
201 case BUS_NOTIFY_UNBOUND_DRIVER:
202 od = to_omap_device(pdev);
203 if (od && (od->_state == OMAP_DEVICE_STATE_ENABLED)) {
204 dev_info(dev, "enabled after unload, idling\n");
205 err = omap_device_idle(pdev);
206 if (err)
207 dev_err(dev, "failed to idle\n");
208 }
209 break;
210 case BUS_NOTIFY_ADD_DEVICE:
211 if (pdev->dev.of_node)
212 omap_device_build_from_dt(pdev);
213 omap_auxdata_legacy_init(dev);
214 /* fall through */
215 default:
216 od = to_omap_device(pdev);
217 if (od)
218 od->_driver_status = event;
219 }
220
221 return NOTIFY_DONE;
222}
223
224/**
225 * _omap_device_enable_hwmods - call omap_hwmod_enable() on all hwmods
226 * @od: struct omap_device *od
227 *
228 * Enable all underlying hwmods. Returns 0.
229 */
230static int _omap_device_enable_hwmods(struct omap_device *od)
231{
232 int ret = 0;
233 int i;
234
235 for (i = 0; i < od->hwmods_cnt; i++)
236 ret |= omap_hwmod_enable(od->hwmods[i]);
237
238 return ret;
239}
240
241/**
242 * _omap_device_idle_hwmods - call omap_hwmod_idle() on all hwmods
243 * @od: struct omap_device *od
244 *
245 * Idle all underlying hwmods. Returns 0.
246 */
247static int _omap_device_idle_hwmods(struct omap_device *od)
248{
249 int ret = 0;
250 int i;
251
252 for (i = 0; i < od->hwmods_cnt; i++)
253 ret |= omap_hwmod_idle(od->hwmods[i]);
254
255 return ret;
256}
257
258/* Public functions for use by core code */
259
260/**
261 * omap_device_get_context_loss_count - get lost context count
262 * @od: struct omap_device *
263 *
264 * Using the primary hwmod, query the context loss count for this
265 * device.
266 *
267 * Callers should consider context for this device lost any time this
268 * function returns a value different than the value the caller got
269 * the last time it called this function.
270 *
271 * If any hwmods exist for the omap_device assoiated with @pdev,
272 * return the context loss counter for that hwmod, otherwise return
273 * zero.
274 */
275int omap_device_get_context_loss_count(struct platform_device *pdev)
276{
277 struct omap_device *od;
278 u32 ret = 0;
279
280 od = to_omap_device(pdev);
281
282 if (od->hwmods_cnt)
283 ret = omap_hwmod_get_context_loss_count(od->hwmods[0]);
284
285 return ret;
286}
287
288/**
289 * omap_device_count_resources - count number of struct resource entries needed
290 * @od: struct omap_device *
291 * @flags: Type of resources to include when counting (IRQ/DMA/MEM)
292 *
293 * Count the number of struct resource entries needed for this
294 * omap_device @od. Used by omap_device_build_ss() to determine how
295 * much memory to allocate before calling
296 * omap_device_fill_resources(). Returns the count.
297 */
298static int omap_device_count_resources(struct omap_device *od,
299 unsigned long flags)
300{
301 int c = 0;
302 int i;
303
304 for (i = 0; i < od->hwmods_cnt; i++)
305 c += omap_hwmod_count_resources(od->hwmods[i], flags);
306
307 pr_debug("omap_device: %s: counted %d total resources across %d hwmods\n",
308 od->pdev->name, c, od->hwmods_cnt);
309
310 return c;
311}
312
313/**
314 * omap_device_fill_resources - fill in array of struct resource
315 * @od: struct omap_device *
316 * @res: pointer to an array of struct resource to be filled in
317 *
318 * Populate one or more empty struct resource pointed to by @res with
319 * the resource data for this omap_device @od. Used by
320 * omap_device_build_ss() after calling omap_device_count_resources().
321 * Ideally this function would not be needed at all. If omap_device
322 * replaces platform_device, then we can specify our own
323 * get_resource()/ get_irq()/etc functions that use the underlying
324 * omap_hwmod information. Or if platform_device is extended to use
325 * subarchitecture-specific function pointers, the various
326 * platform_device functions can simply call omap_device internal
327 * functions to get device resources. Hacking around the existing
328 * platform_device code wastes memory. Returns 0.
329 */
330static int omap_device_fill_resources(struct omap_device *od,
331 struct resource *res)
332{
333 int i, r;
334
335 for (i = 0; i < od->hwmods_cnt; i++) {
336 r = omap_hwmod_fill_resources(od->hwmods[i], res);
337 res += r;
338 }
339
340 return 0;
341}
342
343/**
344 * _od_fill_dma_resources - fill in array of struct resource with dma resources
345 * @od: struct omap_device *
346 * @res: pointer to an array of struct resource to be filled in
347 *
348 * Populate one or more empty struct resource pointed to by @res with
349 * the dma resource data for this omap_device @od. Used by
350 * omap_device_alloc() after calling omap_device_count_resources().
351 *
352 * Ideally this function would not be needed at all. If we have
353 * mechanism to get dma resources from DT.
354 *
355 * Returns 0.
356 */
357static int _od_fill_dma_resources(struct omap_device *od,
358 struct resource *res)
359{
360 int i, r;
361
362 for (i = 0; i < od->hwmods_cnt; i++) {
363 r = omap_hwmod_fill_dma_resources(od->hwmods[i], res);
364 res += r;
365 }
366
367 return 0;
368}
369
370/**
371 * omap_device_alloc - allocate an omap_device
372 * @pdev: platform_device that will be included in this omap_device
373 * @oh: ptr to the single omap_hwmod that backs this omap_device
374 * @pdata: platform_data ptr to associate with the platform_device
375 * @pdata_len: amount of memory pointed to by @pdata
376 *
377 * Convenience function for allocating an omap_device structure and filling
378 * hwmods, and resources.
379 *
380 * Returns an struct omap_device pointer or ERR_PTR() on error;
381 */
382struct omap_device *omap_device_alloc(struct platform_device *pdev,
383 struct omap_hwmod **ohs, int oh_cnt)
384{
385 int ret = -ENOMEM;
386 struct omap_device *od;
387 struct resource *res = NULL;
388 int i, res_count;
389 struct omap_hwmod **hwmods;
390
391 od = kzalloc(sizeof(struct omap_device), GFP_KERNEL);
392 if (!od) {
393 ret = -ENOMEM;
394 goto oda_exit1;
395 }
396 od->hwmods_cnt = oh_cnt;
397
398 hwmods = kmemdup(ohs, sizeof(struct omap_hwmod *) * oh_cnt, GFP_KERNEL);
399 if (!hwmods)
400 goto oda_exit2;
401
402 od->hwmods = hwmods;
403 od->pdev = pdev;
404
405 /*
406 * Non-DT Boot:
407 * Here, pdev->num_resources = 0, and we should get all the
408 * resources from hwmod.
409 *
410 * DT Boot:
411 * OF framework will construct the resource structure (currently
412 * does for MEM & IRQ resource) and we should respect/use these
413 * resources, killing hwmod dependency.
414 * If pdev->num_resources > 0, we assume that MEM & IRQ resources
415 * have been allocated by OF layer already (through DTB).
416 * As preparation for the future we examine the OF provided resources
417 * to see if we have DMA resources provided already. In this case
418 * there is no need to update the resources for the device, we use the
419 * OF provided ones.
420 *
421 * TODO: Once DMA resource is available from OF layer, we should
422 * kill filling any resources from hwmod.
423 */
424 if (!pdev->num_resources) {
425 /* Count all resources for the device */
426 res_count = omap_device_count_resources(od, IORESOURCE_IRQ |
427 IORESOURCE_DMA |
428 IORESOURCE_MEM);
429 } else {
430 /* Take a look if we already have DMA resource via DT */
431 for (i = 0; i < pdev->num_resources; i++) {
432 struct resource *r = &pdev->resource[i];
433
434 /* We have it, no need to touch the resources */
435 if (r->flags == IORESOURCE_DMA)
436 goto have_everything;
437 }
438 /* Count only DMA resources for the device */
439 res_count = omap_device_count_resources(od, IORESOURCE_DMA);
440 /* The device has no DMA resource, no need for update */
441 if (!res_count)
442 goto have_everything;
443
444 res_count += pdev->num_resources;
445 }
446
447 /* Allocate resources memory to account for new resources */
448 res = kzalloc(sizeof(struct resource) * res_count, GFP_KERNEL);
449 if (!res)
450 goto oda_exit3;
451
452 if (!pdev->num_resources) {
453 dev_dbg(&pdev->dev, "%s: using %d resources from hwmod\n",
454 __func__, res_count);
455 omap_device_fill_resources(od, res);
456 } else {
457 dev_dbg(&pdev->dev,
458 "%s: appending %d DMA resources from hwmod\n",
459 __func__, res_count - pdev->num_resources);
460 memcpy(res, pdev->resource,
461 sizeof(struct resource) * pdev->num_resources);
462 _od_fill_dma_resources(od, &res[pdev->num_resources]);
463 }
464
465 ret = platform_device_add_resources(pdev, res, res_count);
466 kfree(res);
467
468 if (ret)
469 goto oda_exit3;
470
471have_everything:
472 pdev->archdata.od = od;
473
474 for (i = 0; i < oh_cnt; i++) {
475 hwmods[i]->od = od;
476 _add_hwmod_clocks_clkdev(od, hwmods[i]);
477 }
478
479 return od;
480
481oda_exit3:
482 kfree(hwmods);
483oda_exit2:
484 kfree(od);
485oda_exit1:
486 dev_err(&pdev->dev, "omap_device: build failed (%d)\n", ret);
487
488 return ERR_PTR(ret);
489}
490
491void omap_device_delete(struct omap_device *od)
492{
493 if (!od)
494 return;
495
496 od->pdev->archdata.od = NULL;
497 kfree(od->hwmods);
498 kfree(od);
499}
500
501/**
502 * omap_device_build - build and register an omap_device with one omap_hwmod
503 * @pdev_name: name of the platform_device driver to use
504 * @pdev_id: this platform_device's connection ID
505 * @oh: ptr to the single omap_hwmod that backs this omap_device
506 * @pdata: platform_data ptr to associate with the platform_device
507 * @pdata_len: amount of memory pointed to by @pdata
508 *
509 * Convenience function for building and registering a single
510 * omap_device record, which in turn builds and registers a
511 * platform_device record. See omap_device_build_ss() for more
512 * information. Returns ERR_PTR(-EINVAL) if @oh is NULL; otherwise,
513 * passes along the return value of omap_device_build_ss().
514 */
515struct platform_device __init *omap_device_build(const char *pdev_name,
516 int pdev_id,
517 struct omap_hwmod *oh,
518 void *pdata, int pdata_len)
519{
520 struct omap_hwmod *ohs[] = { oh };
521
522 if (!oh)
523 return ERR_PTR(-EINVAL);
524
525 return omap_device_build_ss(pdev_name, pdev_id, ohs, 1, pdata,
526 pdata_len);
527}
528
529/**
530 * omap_device_build_ss - build and register an omap_device with multiple hwmods
531 * @pdev_name: name of the platform_device driver to use
532 * @pdev_id: this platform_device's connection ID
533 * @oh: ptr to the single omap_hwmod that backs this omap_device
534 * @pdata: platform_data ptr to associate with the platform_device
535 * @pdata_len: amount of memory pointed to by @pdata
536 *
537 * Convenience function for building and registering an omap_device
538 * subsystem record. Subsystem records consist of multiple
539 * omap_hwmods. This function in turn builds and registers a
540 * platform_device record. Returns an ERR_PTR() on error, or passes
541 * along the return value of omap_device_register().
542 */
543struct platform_device __init *omap_device_build_ss(const char *pdev_name,
544 int pdev_id,
545 struct omap_hwmod **ohs,
546 int oh_cnt, void *pdata,
547 int pdata_len)
548{
549 int ret = -ENOMEM;
550 struct platform_device *pdev;
551 struct omap_device *od;
552
553 if (!ohs || oh_cnt == 0 || !pdev_name)
554 return ERR_PTR(-EINVAL);
555
556 if (!pdata && pdata_len > 0)
557 return ERR_PTR(-EINVAL);
558
559 pdev = platform_device_alloc(pdev_name, pdev_id);
560 if (!pdev) {
561 ret = -ENOMEM;
562 goto odbs_exit;
563 }
564
565 /* Set the dev_name early to allow dev_xxx in omap_device_alloc */
566 if (pdev->id != -1)
567 dev_set_name(&pdev->dev, "%s.%d", pdev->name, pdev->id);
568 else
569 dev_set_name(&pdev->dev, "%s", pdev->name);
570
571 od = omap_device_alloc(pdev, ohs, oh_cnt);
572 if (IS_ERR(od))
573 goto odbs_exit1;
574
575 ret = platform_device_add_data(pdev, pdata, pdata_len);
576 if (ret)
577 goto odbs_exit2;
578
579 ret = omap_device_register(pdev);
580 if (ret)
581 goto odbs_exit2;
582
583 return pdev;
584
585odbs_exit2:
586 omap_device_delete(od);
587odbs_exit1:
588 platform_device_put(pdev);
589odbs_exit:
590
591 pr_err("omap_device: %s: build failed (%d)\n", pdev_name, ret);
592
593 return ERR_PTR(ret);
594}
595
596#ifdef CONFIG_PM
597static int _od_runtime_suspend(struct device *dev)
598{
599 struct platform_device *pdev = to_platform_device(dev);
600 int ret;
601
602 ret = pm_generic_runtime_suspend(dev);
603 if (ret)
604 return ret;
605
606 return omap_device_idle(pdev);
607}
608
609static int _od_runtime_resume(struct device *dev)
610{
611 struct platform_device *pdev = to_platform_device(dev);
612 int ret;
613
614 ret = omap_device_enable(pdev);
615 if (ret) {
616 dev_err(dev, "use pm_runtime_put_sync_suspend() in driver?\n");
617 return ret;
618 }
619
620 return pm_generic_runtime_resume(dev);
621}
622
623static int _od_fail_runtime_suspend(struct device *dev)
624{
625 dev_warn(dev, "%s: FIXME: missing hwmod/omap_dev info\n", __func__);
626 return -ENODEV;
627}
628
629static int _od_fail_runtime_resume(struct device *dev)
630{
631 dev_warn(dev, "%s: FIXME: missing hwmod/omap_dev info\n", __func__);
632 return -ENODEV;
633}
634
635#endif
636
637#ifdef CONFIG_SUSPEND
638static int _od_suspend_noirq(struct device *dev)
639{
640 struct platform_device *pdev = to_platform_device(dev);
641 struct omap_device *od = to_omap_device(pdev);
642 int ret;
643
644 /* Don't attempt late suspend on a driver that is not bound */
645 if (od->_driver_status != BUS_NOTIFY_BOUND_DRIVER)
646 return 0;
647
648 ret = pm_generic_suspend_noirq(dev);
649
650 if (!ret && !pm_runtime_status_suspended(dev)) {
651 if (pm_generic_runtime_suspend(dev) == 0) {
652 pm_runtime_set_suspended(dev);
653 omap_device_idle(pdev);
654 od->flags |= OMAP_DEVICE_SUSPENDED;
655 }
656 }
657
658 return ret;
659}
660
661static int _od_resume_noirq(struct device *dev)
662{
663 struct platform_device *pdev = to_platform_device(dev);
664 struct omap_device *od = to_omap_device(pdev);
665
666 if (od->flags & OMAP_DEVICE_SUSPENDED) {
667 od->flags &= ~OMAP_DEVICE_SUSPENDED;
668 omap_device_enable(pdev);
669 /*
670 * XXX: we run before core runtime pm has resumed itself. At
671 * this point in time, we just restore the runtime pm state and
672 * considering symmetric operations in resume, we donot expect
673 * to fail. If we failed, something changed in core runtime_pm
674 * framework OR some device driver messed things up, hence, WARN
675 */
676 WARN(pm_runtime_set_active(dev),
677 "Could not set %s runtime state active\n", dev_name(dev));
678 pm_generic_runtime_resume(dev);
679 }
680
681 return pm_generic_resume_noirq(dev);
682}
683#else
684#define _od_suspend_noirq NULL
685#define _od_resume_noirq NULL
686#endif
687
688struct dev_pm_domain omap_device_fail_pm_domain = {
689 .ops = {
690 SET_RUNTIME_PM_OPS(_od_fail_runtime_suspend,
691 _od_fail_runtime_resume, NULL)
692 }
693};
694
695struct dev_pm_domain omap_device_pm_domain = {
696 .ops = {
697 SET_RUNTIME_PM_OPS(_od_runtime_suspend, _od_runtime_resume,
698 NULL)
699 USE_PLATFORM_PM_SLEEP_OPS
700 SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(_od_suspend_noirq,
701 _od_resume_noirq)
702 }
703};
704
705/**
706 * omap_device_register - register an omap_device with one omap_hwmod
707 * @od: struct omap_device * to register
708 *
709 * Register the omap_device structure. This currently just calls
710 * platform_device_register() on the underlying platform_device.
711 * Returns the return value of platform_device_register().
712 */
713int omap_device_register(struct platform_device *pdev)
714{
715 pr_debug("omap_device: %s: registering\n", pdev->name);
716
717 dev_pm_domain_set(&pdev->dev, &omap_device_pm_domain);
718 return platform_device_add(pdev);
719}
720
721
722/* Public functions for use by device drivers through struct platform_data */
723
724/**
725 * omap_device_enable - fully activate an omap_device
726 * @od: struct omap_device * to activate
727 *
728 * Do whatever is necessary for the hwmods underlying omap_device @od
729 * to be accessible and ready to operate. This generally involves
730 * enabling clocks, setting SYSCONFIG registers; and in the future may
731 * involve remuxing pins. Device drivers should call this function
732 * indirectly via pm_runtime_get*(). Returns -EINVAL if called when
733 * the omap_device is already enabled, or passes along the return
734 * value of _omap_device_enable_hwmods().
735 */
736int omap_device_enable(struct platform_device *pdev)
737{
738 int ret;
739 struct omap_device *od;
740
741 od = to_omap_device(pdev);
742
743 if (od->_state == OMAP_DEVICE_STATE_ENABLED) {
744 dev_warn(&pdev->dev,
745 "omap_device: %s() called from invalid state %d\n",
746 __func__, od->_state);
747 return -EINVAL;
748 }
749
750 ret = _omap_device_enable_hwmods(od);
751
752 if (ret == 0)
753 od->_state = OMAP_DEVICE_STATE_ENABLED;
754
755 return ret;
756}
757
758/**
759 * omap_device_idle - idle an omap_device
760 * @od: struct omap_device * to idle
761 *
762 * Idle omap_device @od. Device drivers call this function indirectly
763 * via pm_runtime_put*(). Returns -EINVAL if the omap_device is not
764 * currently enabled, or passes along the return value of
765 * _omap_device_idle_hwmods().
766 */
767int omap_device_idle(struct platform_device *pdev)
768{
769 int ret;
770 struct omap_device *od;
771
772 od = to_omap_device(pdev);
773
774 if (od->_state != OMAP_DEVICE_STATE_ENABLED) {
775 dev_warn(&pdev->dev,
776 "omap_device: %s() called from invalid state %d\n",
777 __func__, od->_state);
778 return -EINVAL;
779 }
780
781 ret = _omap_device_idle_hwmods(od);
782
783 if (ret == 0)
784 od->_state = OMAP_DEVICE_STATE_IDLE;
785
786 return ret;
787}
788
789/**
790 * omap_device_assert_hardreset - set a device's hardreset line
791 * @pdev: struct platform_device * to reset
792 * @name: const char * name of the reset line
793 *
794 * Set the hardreset line identified by @name on the IP blocks
795 * associated with the hwmods backing the platform_device @pdev. All
796 * of the hwmods associated with @pdev must have the same hardreset
797 * line linked to them for this to work. Passes along the return value
798 * of omap_hwmod_assert_hardreset() in the event of any failure, or
799 * returns 0 upon success.
800 */
801int omap_device_assert_hardreset(struct platform_device *pdev, const char *name)
802{
803 struct omap_device *od = to_omap_device(pdev);
804 int ret = 0;
805 int i;
806
807 for (i = 0; i < od->hwmods_cnt; i++) {
808 ret = omap_hwmod_assert_hardreset(od->hwmods[i], name);
809 if (ret)
810 break;
811 }
812
813 return ret;
814}
815
816/**
817 * omap_device_deassert_hardreset - release a device's hardreset line
818 * @pdev: struct platform_device * to reset
819 * @name: const char * name of the reset line
820 *
821 * Release the hardreset line identified by @name on the IP blocks
822 * associated with the hwmods backing the platform_device @pdev. All
823 * of the hwmods associated with @pdev must have the same hardreset
824 * line linked to them for this to work. Passes along the return
825 * value of omap_hwmod_deassert_hardreset() in the event of any
826 * failure, or returns 0 upon success.
827 */
828int omap_device_deassert_hardreset(struct platform_device *pdev,
829 const char *name)
830{
831 struct omap_device *od = to_omap_device(pdev);
832 int ret = 0;
833 int i;
834
835 for (i = 0; i < od->hwmods_cnt; i++) {
836 ret = omap_hwmod_deassert_hardreset(od->hwmods[i], name);
837 if (ret)
838 break;
839 }
840
841 return ret;
842}
843
844/**
845 * omap_device_get_by_hwmod_name() - convert a hwmod name to
846 * device pointer.
847 * @oh_name: name of the hwmod device
848 *
849 * Returns back a struct device * pointer associated with a hwmod
850 * device represented by a hwmod_name
851 */
852struct device *omap_device_get_by_hwmod_name(const char *oh_name)
853{
854 struct omap_hwmod *oh;
855
856 if (!oh_name) {
857 WARN(1, "%s: no hwmod name!\n", __func__);
858 return ERR_PTR(-EINVAL);
859 }
860
861 oh = omap_hwmod_lookup(oh_name);
862 if (!oh) {
863 WARN(1, "%s: no hwmod for %s\n", __func__,
864 oh_name);
865 return ERR_PTR(-ENODEV);
866 }
867 if (!oh->od) {
868 WARN(1, "%s: no omap_device for %s\n", __func__,
869 oh_name);
870 return ERR_PTR(-ENODEV);
871 }
872
873 return &oh->od->pdev->dev;
874}
875
876static struct notifier_block platform_nb = {
877 .notifier_call = _omap_device_notifier_call,
878};
879
880static int __init omap_device_init(void)
881{
882 bus_register_notifier(&platform_bus_type, &platform_nb);
883 return 0;
884}
885omap_postcore_initcall(omap_device_init);
886
887/**
888 * omap_device_late_idle - idle devices without drivers
889 * @dev: struct device * associated with omap_device
890 * @data: unused
891 *
892 * Check the driver bound status of this device, and idle it
893 * if there is no driver attached.
894 */
895static int __init omap_device_late_idle(struct device *dev, void *data)
896{
897 struct platform_device *pdev = to_platform_device(dev);
898 struct omap_device *od = to_omap_device(pdev);
899 int i;
900
901 if (!od)
902 return 0;
903
904 /*
905 * If omap_device state is enabled, but has no driver bound,
906 * idle it.
907 */
908
909 /*
910 * Some devices (like memory controllers) are always kept
911 * enabled, and should not be idled even with no drivers.
912 */
913 for (i = 0; i < od->hwmods_cnt; i++)
914 if (od->hwmods[i]->flags & HWMOD_INIT_NO_IDLE)
915 return 0;
916
917 if (od->_driver_status != BUS_NOTIFY_BOUND_DRIVER &&
918 od->_driver_status != BUS_NOTIFY_BIND_DRIVER) {
919 if (od->_state == OMAP_DEVICE_STATE_ENABLED) {
920 dev_warn(dev, "%s: enabled but no driver. Idling\n",
921 __func__);
922 omap_device_idle(pdev);
923 }
924 }
925
926 return 0;
927}
928
929static int __init omap_device_late_init(void)
930{
931 bus_for_each_dev(&platform_bus_type, NULL, NULL, omap_device_late_idle);
932
933 WARN(!of_have_populated_dt(),
934 "legacy booting deprecated, please update to boot with .dts\n");
935
936 return 0;
937}
938omap_late_initcall_sync(omap_device_late_init);