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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 r = clk_get_sys(NULL, clk_name);
67
68 if (IS_ERR(r) && of_have_populated_dt()) {
69 struct of_phandle_args clkspec;
70
71 clkspec.np = of_find_node_by_name(NULL, clk_name);
72
73 r = of_clk_get_from_provider(&clkspec);
74
75 rc = clk_register_clkdev(r, clk_alias,
76 dev_name(&od->pdev->dev));
77 } else {
78 rc = clk_add_alias(clk_alias, dev_name(&od->pdev->dev),
79 clk_name, NULL);
80 }
81
82 if (rc) {
83 if (rc == -ENODEV || rc == -ENOMEM)
84 dev_err(&od->pdev->dev,
85 "clkdev_alloc for %s failed\n", clk_alias);
86 else
87 dev_err(&od->pdev->dev,
88 "clk_get for %s failed\n", clk_name);
89 }
90}
91
92/**
93 * _add_hwmod_clocks_clkdev - Add clkdev entry for hwmod optional clocks
94 * and main clock
95 * @od: struct omap_device *od
96 * @oh: struct omap_hwmod *oh
97 *
98 * For the main clock and every optional clock present per hwmod per
99 * omap_device, this function adds an entry in the clkdev table of the
100 * form <dev-id=dev_name, con-id=role> if it does not exist already.
101 *
102 * The function is called from inside omap_device_build_ss(), after
103 * omap_device_register.
104 *
105 * This allows drivers to get a pointer to its optional clocks based on its role
106 * by calling clk_get(<dev*>, <role>).
107 * In the case of the main clock, a "fck" alias is used.
108 *
109 * No return value.
110 */
111static void _add_hwmod_clocks_clkdev(struct omap_device *od,
112 struct omap_hwmod *oh)
113{
114 int i;
115
116 _add_clkdev(od, "fck", oh->main_clk);
117
118 for (i = 0; i < oh->opt_clks_cnt; i++)
119 _add_clkdev(od, oh->opt_clks[i].role, oh->opt_clks[i].clk);
120}
121
122
123/**
124 * omap_device_build_from_dt - build an omap_device with multiple hwmods
125 * @pdev_name: name of the platform_device driver to use
126 * @pdev_id: this platform_device's connection ID
127 * @oh: ptr to the single omap_hwmod that backs this omap_device
128 * @pdata: platform_data ptr to associate with the platform_device
129 * @pdata_len: amount of memory pointed to by @pdata
130 *
131 * Function for building an omap_device already registered from device-tree
132 *
133 * Returns 0 or PTR_ERR() on error.
134 */
135static int omap_device_build_from_dt(struct platform_device *pdev)
136{
137 struct omap_hwmod **hwmods;
138 struct omap_device *od;
139 struct omap_hwmod *oh;
140 struct device_node *node = pdev->dev.of_node;
141 const char *oh_name;
142 int oh_cnt, i, ret = 0;
143 bool device_active = false;
144
145 oh_cnt = of_property_count_strings(node, "ti,hwmods");
146 if (oh_cnt <= 0) {
147 dev_dbg(&pdev->dev, "No 'hwmods' to build omap_device\n");
148 return -ENODEV;
149 }
150
151 hwmods = kzalloc(sizeof(struct omap_hwmod *) * oh_cnt, GFP_KERNEL);
152 if (!hwmods) {
153 ret = -ENOMEM;
154 goto odbfd_exit;
155 }
156
157 for (i = 0; i < oh_cnt; i++) {
158 of_property_read_string_index(node, "ti,hwmods", i, &oh_name);
159 oh = omap_hwmod_lookup(oh_name);
160 if (!oh) {
161 dev_err(&pdev->dev, "Cannot lookup hwmod '%s'\n",
162 oh_name);
163 ret = -EINVAL;
164 goto odbfd_exit1;
165 }
166 hwmods[i] = oh;
167 if (oh->flags & HWMOD_INIT_NO_IDLE)
168 device_active = true;
169 }
170
171 od = omap_device_alloc(pdev, hwmods, oh_cnt);
172 if (IS_ERR(od)) {
173 dev_err(&pdev->dev, "Cannot allocate omap_device for :%s\n",
174 oh_name);
175 ret = PTR_ERR(od);
176 goto odbfd_exit1;
177 }
178
179 /* Fix up missing resource names */
180 for (i = 0; i < pdev->num_resources; i++) {
181 struct resource *r = &pdev->resource[i];
182
183 if (r->name == NULL)
184 r->name = dev_name(&pdev->dev);
185 }
186
187 dev_pm_domain_set(&pdev->dev, &omap_device_pm_domain);
188
189 if (device_active) {
190 omap_device_enable(pdev);
191 pm_runtime_set_active(&pdev->dev);
192 }
193
194odbfd_exit1:
195 kfree(hwmods);
196odbfd_exit:
197 /* if data/we are at fault.. load up a fail handler */
198 if (ret)
199 dev_pm_domain_set(&pdev->dev, &omap_device_fail_pm_domain);
200
201 return ret;
202}
203
204static int _omap_device_notifier_call(struct notifier_block *nb,
205 unsigned long event, void *dev)
206{
207 struct platform_device *pdev = to_platform_device(dev);
208 struct omap_device *od;
209 int err;
210
211 switch (event) {
212 case BUS_NOTIFY_REMOVED_DEVICE:
213 if (pdev->archdata.od)
214 omap_device_delete(pdev->archdata.od);
215 break;
216 case BUS_NOTIFY_UNBOUND_DRIVER:
217 od = to_omap_device(pdev);
218 if (od && (od->_state == OMAP_DEVICE_STATE_ENABLED)) {
219 dev_info(dev, "enabled after unload, idling\n");
220 err = omap_device_idle(pdev);
221 if (err)
222 dev_err(dev, "failed to idle\n");
223 }
224 break;
225 case BUS_NOTIFY_ADD_DEVICE:
226 if (pdev->dev.of_node)
227 omap_device_build_from_dt(pdev);
228 omap_auxdata_legacy_init(dev);
229 /* fall through */
230 default:
231 od = to_omap_device(pdev);
232 if (od)
233 od->_driver_status = event;
234 }
235
236 return NOTIFY_DONE;
237}
238
239/**
240 * _omap_device_enable_hwmods - call omap_hwmod_enable() on all hwmods
241 * @od: struct omap_device *od
242 *
243 * Enable all underlying hwmods. Returns 0.
244 */
245static int _omap_device_enable_hwmods(struct omap_device *od)
246{
247 int ret = 0;
248 int i;
249
250 for (i = 0; i < od->hwmods_cnt; i++)
251 ret |= omap_hwmod_enable(od->hwmods[i]);
252
253 return ret;
254}
255
256/**
257 * _omap_device_idle_hwmods - call omap_hwmod_idle() on all hwmods
258 * @od: struct omap_device *od
259 *
260 * Idle all underlying hwmods. Returns 0.
261 */
262static int _omap_device_idle_hwmods(struct omap_device *od)
263{
264 int ret = 0;
265 int i;
266
267 for (i = 0; i < od->hwmods_cnt; i++)
268 ret |= omap_hwmod_idle(od->hwmods[i]);
269
270 return ret;
271}
272
273/* Public functions for use by core code */
274
275/**
276 * omap_device_get_context_loss_count - get lost context count
277 * @od: struct omap_device *
278 *
279 * Using the primary hwmod, query the context loss count for this
280 * device.
281 *
282 * Callers should consider context for this device lost any time this
283 * function returns a value different than the value the caller got
284 * the last time it called this function.
285 *
286 * If any hwmods exist for the omap_device associated with @pdev,
287 * return the context loss counter for that hwmod, otherwise return
288 * zero.
289 */
290int omap_device_get_context_loss_count(struct platform_device *pdev)
291{
292 struct omap_device *od;
293 u32 ret = 0;
294
295 od = to_omap_device(pdev);
296
297 if (od->hwmods_cnt)
298 ret = omap_hwmod_get_context_loss_count(od->hwmods[0]);
299
300 return ret;
301}
302
303/**
304 * omap_device_count_resources - count number of struct resource entries needed
305 * @od: struct omap_device *
306 * @flags: Type of resources to include when counting (IRQ/DMA/MEM)
307 *
308 * Count the number of struct resource entries needed for this
309 * omap_device @od. Used by omap_device_build_ss() to determine how
310 * much memory to allocate before calling
311 * omap_device_fill_resources(). Returns the count.
312 */
313static int omap_device_count_resources(struct omap_device *od,
314 unsigned long flags)
315{
316 int c = 0;
317 int i;
318
319 for (i = 0; i < od->hwmods_cnt; i++)
320 c += omap_hwmod_count_resources(od->hwmods[i], flags);
321
322 pr_debug("omap_device: %s: counted %d total resources across %d hwmods\n",
323 od->pdev->name, c, od->hwmods_cnt);
324
325 return c;
326}
327
328/**
329 * omap_device_fill_resources - fill in array of struct resource
330 * @od: struct omap_device *
331 * @res: pointer to an array of struct resource to be filled in
332 *
333 * Populate one or more empty struct resource pointed to by @res with
334 * the resource data for this omap_device @od. Used by
335 * omap_device_build_ss() after calling omap_device_count_resources().
336 * Ideally this function would not be needed at all. If omap_device
337 * replaces platform_device, then we can specify our own
338 * get_resource()/ get_irq()/etc functions that use the underlying
339 * omap_hwmod information. Or if platform_device is extended to use
340 * subarchitecture-specific function pointers, the various
341 * platform_device functions can simply call omap_device internal
342 * functions to get device resources. Hacking around the existing
343 * platform_device code wastes memory. Returns 0.
344 */
345static int omap_device_fill_resources(struct omap_device *od,
346 struct resource *res)
347{
348 int i, r;
349
350 for (i = 0; i < od->hwmods_cnt; i++) {
351 r = omap_hwmod_fill_resources(od->hwmods[i], res);
352 res += r;
353 }
354
355 return 0;
356}
357
358/**
359 * _od_fill_dma_resources - fill in array of struct resource with dma resources
360 * @od: struct omap_device *
361 * @res: pointer to an array of struct resource to be filled in
362 *
363 * Populate one or more empty struct resource pointed to by @res with
364 * the dma resource data for this omap_device @od. Used by
365 * omap_device_alloc() after calling omap_device_count_resources().
366 *
367 * Ideally this function would not be needed at all. If we have
368 * mechanism to get dma resources from DT.
369 *
370 * Returns 0.
371 */
372static int _od_fill_dma_resources(struct omap_device *od,
373 struct resource *res)
374{
375 int i, r;
376
377 for (i = 0; i < od->hwmods_cnt; i++) {
378 r = omap_hwmod_fill_dma_resources(od->hwmods[i], res);
379 res += r;
380 }
381
382 return 0;
383}
384
385/**
386 * omap_device_alloc - allocate an omap_device
387 * @pdev: platform_device that will be included in this omap_device
388 * @oh: ptr to the single omap_hwmod that backs this omap_device
389 * @pdata: platform_data ptr to associate with the platform_device
390 * @pdata_len: amount of memory pointed to by @pdata
391 *
392 * Convenience function for allocating an omap_device structure and filling
393 * hwmods, and resources.
394 *
395 * Returns an struct omap_device pointer or ERR_PTR() on error;
396 */
397struct omap_device *omap_device_alloc(struct platform_device *pdev,
398 struct omap_hwmod **ohs, int oh_cnt)
399{
400 int ret = -ENOMEM;
401 struct omap_device *od;
402 struct resource *res = NULL;
403 int i, res_count;
404 struct omap_hwmod **hwmods;
405
406 od = kzalloc(sizeof(struct omap_device), GFP_KERNEL);
407 if (!od) {
408 ret = -ENOMEM;
409 goto oda_exit1;
410 }
411 od->hwmods_cnt = oh_cnt;
412
413 hwmods = kmemdup(ohs, sizeof(struct omap_hwmod *) * oh_cnt, GFP_KERNEL);
414 if (!hwmods)
415 goto oda_exit2;
416
417 od->hwmods = hwmods;
418 od->pdev = pdev;
419
420 /*
421 * Non-DT Boot:
422 * Here, pdev->num_resources = 0, and we should get all the
423 * resources from hwmod.
424 *
425 * DT Boot:
426 * OF framework will construct the resource structure (currently
427 * does for MEM & IRQ resource) and we should respect/use these
428 * resources, killing hwmod dependency.
429 * If pdev->num_resources > 0, we assume that MEM & IRQ resources
430 * have been allocated by OF layer already (through DTB).
431 * As preparation for the future we examine the OF provided resources
432 * to see if we have DMA resources provided already. In this case
433 * there is no need to update the resources for the device, we use the
434 * OF provided ones.
435 *
436 * TODO: Once DMA resource is available from OF layer, we should
437 * kill filling any resources from hwmod.
438 */
439 if (!pdev->num_resources) {
440 /* Count all resources for the device */
441 res_count = omap_device_count_resources(od, IORESOURCE_IRQ |
442 IORESOURCE_DMA |
443 IORESOURCE_MEM);
444 } else {
445 /* Take a look if we already have DMA resource via DT */
446 for (i = 0; i < pdev->num_resources; i++) {
447 struct resource *r = &pdev->resource[i];
448
449 /* We have it, no need to touch the resources */
450 if (r->flags == IORESOURCE_DMA)
451 goto have_everything;
452 }
453 /* Count only DMA resources for the device */
454 res_count = omap_device_count_resources(od, IORESOURCE_DMA);
455 /* The device has no DMA resource, no need for update */
456 if (!res_count)
457 goto have_everything;
458
459 res_count += pdev->num_resources;
460 }
461
462 /* Allocate resources memory to account for new resources */
463 res = kzalloc(sizeof(struct resource) * res_count, GFP_KERNEL);
464 if (!res)
465 goto oda_exit3;
466
467 if (!pdev->num_resources) {
468 dev_dbg(&pdev->dev, "%s: using %d resources from hwmod\n",
469 __func__, res_count);
470 omap_device_fill_resources(od, res);
471 } else {
472 dev_dbg(&pdev->dev,
473 "%s: appending %d DMA resources from hwmod\n",
474 __func__, res_count - pdev->num_resources);
475 memcpy(res, pdev->resource,
476 sizeof(struct resource) * pdev->num_resources);
477 _od_fill_dma_resources(od, &res[pdev->num_resources]);
478 }
479
480 ret = platform_device_add_resources(pdev, res, res_count);
481 kfree(res);
482
483 if (ret)
484 goto oda_exit3;
485
486have_everything:
487 pdev->archdata.od = od;
488
489 for (i = 0; i < oh_cnt; i++) {
490 hwmods[i]->od = od;
491 _add_hwmod_clocks_clkdev(od, hwmods[i]);
492 }
493
494 return od;
495
496oda_exit3:
497 kfree(hwmods);
498oda_exit2:
499 kfree(od);
500oda_exit1:
501 dev_err(&pdev->dev, "omap_device: build failed (%d)\n", ret);
502
503 return ERR_PTR(ret);
504}
505
506void omap_device_delete(struct omap_device *od)
507{
508 if (!od)
509 return;
510
511 od->pdev->archdata.od = NULL;
512 kfree(od->hwmods);
513 kfree(od);
514}
515
516/**
517 * omap_device_build - build and register an omap_device with one omap_hwmod
518 * @pdev_name: name of the platform_device driver to use
519 * @pdev_id: this platform_device's connection ID
520 * @oh: ptr to the single omap_hwmod that backs this omap_device
521 * @pdata: platform_data ptr to associate with the platform_device
522 * @pdata_len: amount of memory pointed to by @pdata
523 *
524 * Convenience function for building and registering a single
525 * omap_device record, which in turn builds and registers a
526 * platform_device record. See omap_device_build_ss() for more
527 * information. Returns ERR_PTR(-EINVAL) if @oh is NULL; otherwise,
528 * passes along the return value of omap_device_build_ss().
529 */
530struct platform_device __init *omap_device_build(const char *pdev_name,
531 int pdev_id,
532 struct omap_hwmod *oh,
533 void *pdata, int pdata_len)
534{
535 struct omap_hwmod *ohs[] = { oh };
536
537 if (!oh)
538 return ERR_PTR(-EINVAL);
539
540 return omap_device_build_ss(pdev_name, pdev_id, ohs, 1, pdata,
541 pdata_len);
542}
543
544/**
545 * omap_device_build_ss - build and register an omap_device with multiple hwmods
546 * @pdev_name: name of the platform_device driver to use
547 * @pdev_id: this platform_device's connection ID
548 * @oh: ptr to the single omap_hwmod that backs this omap_device
549 * @pdata: platform_data ptr to associate with the platform_device
550 * @pdata_len: amount of memory pointed to by @pdata
551 *
552 * Convenience function for building and registering an omap_device
553 * subsystem record. Subsystem records consist of multiple
554 * omap_hwmods. This function in turn builds and registers a
555 * platform_device record. Returns an ERR_PTR() on error, or passes
556 * along the return value of omap_device_register().
557 */
558struct platform_device __init *omap_device_build_ss(const char *pdev_name,
559 int pdev_id,
560 struct omap_hwmod **ohs,
561 int oh_cnt, void *pdata,
562 int pdata_len)
563{
564 int ret = -ENOMEM;
565 struct platform_device *pdev;
566 struct omap_device *od;
567
568 if (!ohs || oh_cnt == 0 || !pdev_name)
569 return ERR_PTR(-EINVAL);
570
571 if (!pdata && pdata_len > 0)
572 return ERR_PTR(-EINVAL);
573
574 pdev = platform_device_alloc(pdev_name, pdev_id);
575 if (!pdev) {
576 ret = -ENOMEM;
577 goto odbs_exit;
578 }
579
580 /* Set the dev_name early to allow dev_xxx in omap_device_alloc */
581 if (pdev->id != -1)
582 dev_set_name(&pdev->dev, "%s.%d", pdev->name, pdev->id);
583 else
584 dev_set_name(&pdev->dev, "%s", pdev->name);
585
586 od = omap_device_alloc(pdev, ohs, oh_cnt);
587 if (IS_ERR(od))
588 goto odbs_exit1;
589
590 ret = platform_device_add_data(pdev, pdata, pdata_len);
591 if (ret)
592 goto odbs_exit2;
593
594 ret = omap_device_register(pdev);
595 if (ret)
596 goto odbs_exit2;
597
598 return pdev;
599
600odbs_exit2:
601 omap_device_delete(od);
602odbs_exit1:
603 platform_device_put(pdev);
604odbs_exit:
605
606 pr_err("omap_device: %s: build failed (%d)\n", pdev_name, ret);
607
608 return ERR_PTR(ret);
609}
610
611#ifdef CONFIG_PM
612static int _od_runtime_suspend(struct device *dev)
613{
614 struct platform_device *pdev = to_platform_device(dev);
615 int ret;
616
617 ret = pm_generic_runtime_suspend(dev);
618 if (ret)
619 return ret;
620
621 return omap_device_idle(pdev);
622}
623
624static int _od_runtime_resume(struct device *dev)
625{
626 struct platform_device *pdev = to_platform_device(dev);
627 int ret;
628
629 ret = omap_device_enable(pdev);
630 if (ret) {
631 dev_err(dev, "use pm_runtime_put_sync_suspend() in driver?\n");
632 return ret;
633 }
634
635 return pm_generic_runtime_resume(dev);
636}
637
638static int _od_fail_runtime_suspend(struct device *dev)
639{
640 dev_warn(dev, "%s: FIXME: missing hwmod/omap_dev info\n", __func__);
641 return -ENODEV;
642}
643
644static int _od_fail_runtime_resume(struct device *dev)
645{
646 dev_warn(dev, "%s: FIXME: missing hwmod/omap_dev info\n", __func__);
647 return -ENODEV;
648}
649
650#endif
651
652#ifdef CONFIG_SUSPEND
653static int _od_suspend_noirq(struct device *dev)
654{
655 struct platform_device *pdev = to_platform_device(dev);
656 struct omap_device *od = to_omap_device(pdev);
657 int ret;
658
659 /* Don't attempt late suspend on a driver that is not bound */
660 if (od->_driver_status != BUS_NOTIFY_BOUND_DRIVER)
661 return 0;
662
663 ret = pm_generic_suspend_noirq(dev);
664
665 if (!ret && !pm_runtime_status_suspended(dev)) {
666 if (pm_generic_runtime_suspend(dev) == 0) {
667 pm_runtime_set_suspended(dev);
668 omap_device_idle(pdev);
669 od->flags |= OMAP_DEVICE_SUSPENDED;
670 }
671 }
672
673 return ret;
674}
675
676static int _od_resume_noirq(struct device *dev)
677{
678 struct platform_device *pdev = to_platform_device(dev);
679 struct omap_device *od = to_omap_device(pdev);
680
681 if (od->flags & OMAP_DEVICE_SUSPENDED) {
682 od->flags &= ~OMAP_DEVICE_SUSPENDED;
683 omap_device_enable(pdev);
684 /*
685 * XXX: we run before core runtime pm has resumed itself. At
686 * this point in time, we just restore the runtime pm state and
687 * considering symmetric operations in resume, we donot expect
688 * to fail. If we failed, something changed in core runtime_pm
689 * framework OR some device driver messed things up, hence, WARN
690 */
691 WARN(pm_runtime_set_active(dev),
692 "Could not set %s runtime state active\n", dev_name(dev));
693 pm_generic_runtime_resume(dev);
694 }
695
696 return pm_generic_resume_noirq(dev);
697}
698#else
699#define _od_suspend_noirq NULL
700#define _od_resume_noirq NULL
701#endif
702
703struct dev_pm_domain omap_device_fail_pm_domain = {
704 .ops = {
705 SET_RUNTIME_PM_OPS(_od_fail_runtime_suspend,
706 _od_fail_runtime_resume, NULL)
707 }
708};
709
710struct dev_pm_domain omap_device_pm_domain = {
711 .ops = {
712 SET_RUNTIME_PM_OPS(_od_runtime_suspend, _od_runtime_resume,
713 NULL)
714 USE_PLATFORM_PM_SLEEP_OPS
715 SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(_od_suspend_noirq,
716 _od_resume_noirq)
717 }
718};
719
720/**
721 * omap_device_register - register an omap_device with one omap_hwmod
722 * @od: struct omap_device * to register
723 *
724 * Register the omap_device structure. This currently just calls
725 * platform_device_register() on the underlying platform_device.
726 * Returns the return value of platform_device_register().
727 */
728int omap_device_register(struct platform_device *pdev)
729{
730 pr_debug("omap_device: %s: registering\n", pdev->name);
731
732 dev_pm_domain_set(&pdev->dev, &omap_device_pm_domain);
733 return platform_device_add(pdev);
734}
735
736
737/* Public functions for use by device drivers through struct platform_data */
738
739/**
740 * omap_device_enable - fully activate an omap_device
741 * @od: struct omap_device * to activate
742 *
743 * Do whatever is necessary for the hwmods underlying omap_device @od
744 * to be accessible and ready to operate. This generally involves
745 * enabling clocks, setting SYSCONFIG registers; and in the future may
746 * involve remuxing pins. Device drivers should call this function
747 * indirectly via pm_runtime_get*(). Returns -EINVAL if called when
748 * the omap_device is already enabled, or passes along the return
749 * value of _omap_device_enable_hwmods().
750 */
751int omap_device_enable(struct platform_device *pdev)
752{
753 int ret;
754 struct omap_device *od;
755
756 od = to_omap_device(pdev);
757
758 if (od->_state == OMAP_DEVICE_STATE_ENABLED) {
759 dev_warn(&pdev->dev,
760 "omap_device: %s() called from invalid state %d\n",
761 __func__, od->_state);
762 return -EINVAL;
763 }
764
765 ret = _omap_device_enable_hwmods(od);
766
767 if (ret == 0)
768 od->_state = OMAP_DEVICE_STATE_ENABLED;
769
770 return ret;
771}
772
773/**
774 * omap_device_idle - idle an omap_device
775 * @od: struct omap_device * to idle
776 *
777 * Idle omap_device @od. Device drivers call this function indirectly
778 * via pm_runtime_put*(). Returns -EINVAL if the omap_device is not
779 * currently enabled, or passes along the return value of
780 * _omap_device_idle_hwmods().
781 */
782int omap_device_idle(struct platform_device *pdev)
783{
784 int ret;
785 struct omap_device *od;
786
787 od = to_omap_device(pdev);
788
789 if (od->_state != OMAP_DEVICE_STATE_ENABLED) {
790 dev_warn(&pdev->dev,
791 "omap_device: %s() called from invalid state %d\n",
792 __func__, od->_state);
793 return -EINVAL;
794 }
795
796 ret = _omap_device_idle_hwmods(od);
797
798 if (ret == 0)
799 od->_state = OMAP_DEVICE_STATE_IDLE;
800
801 return ret;
802}
803
804/**
805 * omap_device_assert_hardreset - set a device's hardreset line
806 * @pdev: struct platform_device * to reset
807 * @name: const char * name of the reset line
808 *
809 * Set the hardreset line identified by @name on the IP blocks
810 * associated with the hwmods backing the platform_device @pdev. All
811 * of the hwmods associated with @pdev must have the same hardreset
812 * line linked to them for this to work. Passes along the return value
813 * of omap_hwmod_assert_hardreset() in the event of any failure, or
814 * returns 0 upon success.
815 */
816int omap_device_assert_hardreset(struct platform_device *pdev, const char *name)
817{
818 struct omap_device *od = to_omap_device(pdev);
819 int ret = 0;
820 int i;
821
822 for (i = 0; i < od->hwmods_cnt; i++) {
823 ret = omap_hwmod_assert_hardreset(od->hwmods[i], name);
824 if (ret)
825 break;
826 }
827
828 return ret;
829}
830
831/**
832 * omap_device_deassert_hardreset - release a device's hardreset line
833 * @pdev: struct platform_device * to reset
834 * @name: const char * name of the reset line
835 *
836 * Release the hardreset line identified by @name on the IP blocks
837 * associated with the hwmods backing the platform_device @pdev. All
838 * of the hwmods associated with @pdev must have the same hardreset
839 * line linked to them for this to work. Passes along the return
840 * value of omap_hwmod_deassert_hardreset() in the event of any
841 * failure, or returns 0 upon success.
842 */
843int omap_device_deassert_hardreset(struct platform_device *pdev,
844 const char *name)
845{
846 struct omap_device *od = to_omap_device(pdev);
847 int ret = 0;
848 int i;
849
850 for (i = 0; i < od->hwmods_cnt; i++) {
851 ret = omap_hwmod_deassert_hardreset(od->hwmods[i], name);
852 if (ret)
853 break;
854 }
855
856 return ret;
857}
858
859/**
860 * omap_device_get_by_hwmod_name() - convert a hwmod name to
861 * device pointer.
862 * @oh_name: name of the hwmod device
863 *
864 * Returns back a struct device * pointer associated with a hwmod
865 * device represented by a hwmod_name
866 */
867struct device *omap_device_get_by_hwmod_name(const char *oh_name)
868{
869 struct omap_hwmod *oh;
870
871 if (!oh_name) {
872 WARN(1, "%s: no hwmod name!\n", __func__);
873 return ERR_PTR(-EINVAL);
874 }
875
876 oh = omap_hwmod_lookup(oh_name);
877 if (!oh) {
878 WARN(1, "%s: no hwmod for %s\n", __func__,
879 oh_name);
880 return ERR_PTR(-ENODEV);
881 }
882 if (!oh->od) {
883 WARN(1, "%s: no omap_device for %s\n", __func__,
884 oh_name);
885 return ERR_PTR(-ENODEV);
886 }
887
888 return &oh->od->pdev->dev;
889}
890
891static struct notifier_block platform_nb = {
892 .notifier_call = _omap_device_notifier_call,
893};
894
895static int __init omap_device_init(void)
896{
897 bus_register_notifier(&platform_bus_type, &platform_nb);
898 return 0;
899}
900omap_postcore_initcall(omap_device_init);
901
902/**
903 * omap_device_late_idle - idle devices without drivers
904 * @dev: struct device * associated with omap_device
905 * @data: unused
906 *
907 * Check the driver bound status of this device, and idle it
908 * if there is no driver attached.
909 */
910static int __init omap_device_late_idle(struct device *dev, void *data)
911{
912 struct platform_device *pdev = to_platform_device(dev);
913 struct omap_device *od = to_omap_device(pdev);
914 int i;
915
916 if (!od)
917 return 0;
918
919 /*
920 * If omap_device state is enabled, but has no driver bound,
921 * idle it.
922 */
923
924 /*
925 * Some devices (like memory controllers) are always kept
926 * enabled, and should not be idled even with no drivers.
927 */
928 for (i = 0; i < od->hwmods_cnt; i++)
929 if (od->hwmods[i]->flags & HWMOD_INIT_NO_IDLE)
930 return 0;
931
932 if (od->_driver_status != BUS_NOTIFY_BOUND_DRIVER &&
933 od->_driver_status != BUS_NOTIFY_BIND_DRIVER) {
934 if (od->_state == OMAP_DEVICE_STATE_ENABLED) {
935 dev_warn(dev, "%s: enabled but no driver. Idling\n",
936 __func__);
937 omap_device_idle(pdev);
938 }
939 }
940
941 return 0;
942}
943
944static int __init omap_device_late_init(void)
945{
946 bus_for_each_dev(&platform_bus_type, NULL, NULL, omap_device_late_idle);
947
948 WARN(!of_have_populated_dt(),
949 "legacy booting deprecated, please update to boot with .dts\n");
950
951 return 0;
952}
953omap_late_initcall_sync(omap_device_late_init);
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * omap_device implementation
4 *
5 * Copyright (C) 2009-2010 Nokia Corporation
6 * Paul Walmsley, Kevin Hilman
7 *
8 * Developed in collaboration with (alphabetical order): Benoit
9 * Cousson, Thara Gopinath, Tony Lindgren, Rajendra Nayak, Vikram
10 * Pandita, Sakari Poussa, Anand Sawant, Santosh Shilimkar, Richard
11 * Woodruff
12 *
13 * This code provides a consistent interface for OMAP device drivers
14 * to control power management and interconnect properties of their
15 * devices.
16 *
17 * In the medium- to long-term, this code should be implemented as a
18 * proper omap_bus/omap_device in Linux, no more platform_data func
19 * pointers
20 */
21#undef DEBUG
22
23#include <linux/kernel.h>
24#include <linux/platform_device.h>
25#include <linux/slab.h>
26#include <linux/err.h>
27#include <linux/io.h>
28#include <linux/clk.h>
29#include <linux/clkdev.h>
30#include <linux/pm_domain.h>
31#include <linux/pm_runtime.h>
32#include <linux/of.h>
33#include <linux/of_address.h>
34#include <linux/of_irq.h>
35#include <linux/notifier.h>
36
37#include "common.h"
38#include "soc.h"
39#include "omap_device.h"
40#include "omap_hwmod.h"
41
42/* Private functions */
43
44static void _add_clkdev(struct omap_device *od, const char *clk_alias,
45 const char *clk_name)
46{
47 struct clk *r;
48 int rc;
49
50 if (!clk_alias || !clk_name)
51 return;
52
53 dev_dbg(&od->pdev->dev, "Creating %s -> %s\n", clk_alias, clk_name);
54
55 r = clk_get_sys(dev_name(&od->pdev->dev), clk_alias);
56 if (!IS_ERR(r)) {
57 dev_dbg(&od->pdev->dev,
58 "alias %s already exists\n", clk_alias);
59 clk_put(r);
60 return;
61 }
62
63 r = clk_get_sys(NULL, clk_name);
64
65 if (IS_ERR(r)) {
66 struct of_phandle_args clkspec;
67
68 clkspec.np = of_find_node_by_name(NULL, clk_name);
69
70 r = of_clk_get_from_provider(&clkspec);
71
72 rc = clk_register_clkdev(r, clk_alias,
73 dev_name(&od->pdev->dev));
74 } else {
75 rc = clk_add_alias(clk_alias, dev_name(&od->pdev->dev),
76 clk_name, NULL);
77 }
78
79 if (rc) {
80 if (rc == -ENODEV || rc == -ENOMEM)
81 dev_err(&od->pdev->dev,
82 "clkdev_alloc for %s failed\n", clk_alias);
83 else
84 dev_err(&od->pdev->dev,
85 "clk_get for %s failed\n", clk_name);
86 }
87}
88
89/**
90 * _add_hwmod_clocks_clkdev - Add clkdev entry for hwmod optional clocks
91 * and main clock
92 * @od: struct omap_device *od
93 * @oh: struct omap_hwmod *oh
94 *
95 * For the main clock and every optional clock present per hwmod per
96 * omap_device, this function adds an entry in the clkdev table of the
97 * form <dev-id=dev_name, con-id=role> if it does not exist already.
98 *
99 * The function is called from inside omap_device_build_ss(), after
100 * omap_device_register.
101 *
102 * This allows drivers to get a pointer to its optional clocks based on its role
103 * by calling clk_get(<dev*>, <role>).
104 * In the case of the main clock, a "fck" alias is used.
105 *
106 * No return value.
107 */
108static void _add_hwmod_clocks_clkdev(struct omap_device *od,
109 struct omap_hwmod *oh)
110{
111 int i;
112
113 _add_clkdev(od, "fck", oh->main_clk);
114
115 for (i = 0; i < oh->opt_clks_cnt; i++)
116 _add_clkdev(od, oh->opt_clks[i].role, oh->opt_clks[i].clk);
117}
118
119
120/**
121 * omap_device_build_from_dt - build an omap_device with multiple hwmods
122 * @pdev: The platform device to update.
123 *
124 * Function for building an omap_device already registered from device-tree
125 *
126 * Returns 0 or PTR_ERR() on error.
127 */
128static int omap_device_build_from_dt(struct platform_device *pdev)
129{
130 struct omap_hwmod **hwmods;
131 struct omap_device *od;
132 struct omap_hwmod *oh;
133 struct device_node *node = pdev->dev.of_node;
134 struct resource res;
135 const char *oh_name;
136 int oh_cnt, i, ret = 0;
137 bool device_active = false, skip_pm_domain = false;
138
139 oh_cnt = of_property_count_strings(node, "ti,hwmods");
140 if (oh_cnt <= 0) {
141 dev_dbg(&pdev->dev, "No 'hwmods' to build omap_device\n");
142 return -ENODEV;
143 }
144
145 /* SDMA still needs special handling for omap_device_build() */
146 ret = of_property_read_string_index(node, "ti,hwmods", 0, &oh_name);
147 if (!ret && (!strncmp("dma_system", oh_name, 10) ||
148 !strncmp("dma", oh_name, 3)))
149 skip_pm_domain = true;
150
151 /* Use ti-sysc driver instead of omap_device? */
152 if (!skip_pm_domain &&
153 !omap_hwmod_parse_module_range(NULL, node, &res))
154 return -ENODEV;
155
156 hwmods = kcalloc(oh_cnt, sizeof(struct omap_hwmod *), GFP_KERNEL);
157 if (!hwmods) {
158 ret = -ENOMEM;
159 goto odbfd_exit;
160 }
161
162 for (i = 0; i < oh_cnt; i++) {
163 of_property_read_string_index(node, "ti,hwmods", i, &oh_name);
164 oh = omap_hwmod_lookup(oh_name);
165 if (!oh) {
166 dev_err(&pdev->dev, "Cannot lookup hwmod '%s'\n",
167 oh_name);
168 ret = -EINVAL;
169 goto odbfd_exit1;
170 }
171 hwmods[i] = oh;
172 if (oh->flags & HWMOD_INIT_NO_IDLE)
173 device_active = true;
174 }
175
176 od = omap_device_alloc(pdev, hwmods, oh_cnt);
177 if (IS_ERR(od)) {
178 dev_err(&pdev->dev, "Cannot allocate omap_device for :%s\n",
179 oh_name);
180 ret = PTR_ERR(od);
181 goto odbfd_exit1;
182 }
183
184 /* Fix up missing resource names */
185 for (i = 0; i < pdev->num_resources; i++) {
186 struct resource *r = &pdev->resource[i];
187
188 if (r->name == NULL)
189 r->name = dev_name(&pdev->dev);
190 }
191
192 if (!skip_pm_domain) {
193 dev_pm_domain_set(&pdev->dev, &omap_device_pm_domain);
194 if (device_active) {
195 omap_device_enable(pdev);
196 pm_runtime_set_active(&pdev->dev);
197 }
198 }
199
200odbfd_exit1:
201 kfree(hwmods);
202odbfd_exit:
203 /* if data/we are at fault.. load up a fail handler */
204 if (ret)
205 dev_pm_domain_set(&pdev->dev, &omap_device_fail_pm_domain);
206
207 return ret;
208}
209
210static int _omap_device_notifier_call(struct notifier_block *nb,
211 unsigned long event, void *dev)
212{
213 struct platform_device *pdev = to_platform_device(dev);
214 struct omap_device *od;
215 int err;
216
217 switch (event) {
218 case BUS_NOTIFY_REMOVED_DEVICE:
219 if (pdev->archdata.od)
220 omap_device_delete(pdev->archdata.od);
221 break;
222 case BUS_NOTIFY_UNBOUND_DRIVER:
223 od = to_omap_device(pdev);
224 if (od && (od->_state == OMAP_DEVICE_STATE_ENABLED)) {
225 dev_info(dev, "enabled after unload, idling\n");
226 err = omap_device_idle(pdev);
227 if (err)
228 dev_err(dev, "failed to idle\n");
229 }
230 break;
231 case BUS_NOTIFY_BIND_DRIVER:
232 od = to_omap_device(pdev);
233 if (od) {
234 od->_driver_status = BUS_NOTIFY_BIND_DRIVER;
235 if (od->_state == OMAP_DEVICE_STATE_ENABLED &&
236 pm_runtime_status_suspended(dev)) {
237 pm_runtime_set_active(dev);
238 }
239 }
240 break;
241 case BUS_NOTIFY_ADD_DEVICE:
242 if (pdev->dev.of_node)
243 omap_device_build_from_dt(pdev);
244 omap_auxdata_legacy_init(dev);
245 fallthrough;
246 default:
247 od = to_omap_device(pdev);
248 if (od)
249 od->_driver_status = event;
250 }
251
252 return NOTIFY_DONE;
253}
254
255/**
256 * _omap_device_enable_hwmods - call omap_hwmod_enable() on all hwmods
257 * @od: struct omap_device *od
258 *
259 * Enable all underlying hwmods. Returns 0.
260 */
261static int _omap_device_enable_hwmods(struct omap_device *od)
262{
263 int ret = 0;
264 int i;
265
266 for (i = 0; i < od->hwmods_cnt; i++)
267 ret |= omap_hwmod_enable(od->hwmods[i]);
268
269 return ret;
270}
271
272/**
273 * _omap_device_idle_hwmods - call omap_hwmod_idle() on all hwmods
274 * @od: struct omap_device *od
275 *
276 * Idle all underlying hwmods. Returns 0.
277 */
278static int _omap_device_idle_hwmods(struct omap_device *od)
279{
280 int ret = 0;
281 int i;
282
283 for (i = 0; i < od->hwmods_cnt; i++)
284 ret |= omap_hwmod_idle(od->hwmods[i]);
285
286 return ret;
287}
288
289/* Public functions for use by core code */
290
291/**
292 * omap_device_get_context_loss_count - get lost context count
293 * @pdev: The platform device to update.
294 *
295 * Using the primary hwmod, query the context loss count for this
296 * device.
297 *
298 * Callers should consider context for this device lost any time this
299 * function returns a value different than the value the caller got
300 * the last time it called this function.
301 *
302 * If any hwmods exist for the omap_device associated with @pdev,
303 * return the context loss counter for that hwmod, otherwise return
304 * zero.
305 */
306int omap_device_get_context_loss_count(struct platform_device *pdev)
307{
308 struct omap_device *od;
309 u32 ret = 0;
310
311 od = to_omap_device(pdev);
312
313 if (od->hwmods_cnt)
314 ret = omap_hwmod_get_context_loss_count(od->hwmods[0]);
315
316 return ret;
317}
318
319/**
320 * omap_device_alloc - allocate an omap_device
321 * @pdev: platform_device that will be included in this omap_device
322 * @ohs: ptr to the omap_hwmod for this omap_device
323 * @oh_cnt: the size of the ohs list
324 *
325 * Convenience function for allocating an omap_device structure and filling
326 * hwmods, and resources.
327 *
328 * Returns an struct omap_device pointer or ERR_PTR() on error;
329 */
330struct omap_device *omap_device_alloc(struct platform_device *pdev,
331 struct omap_hwmod **ohs, int oh_cnt)
332{
333 int ret = -ENOMEM;
334 struct omap_device *od;
335 int i;
336 struct omap_hwmod **hwmods;
337
338 od = kzalloc(sizeof(struct omap_device), GFP_KERNEL);
339 if (!od)
340 goto oda_exit1;
341
342 od->hwmods_cnt = oh_cnt;
343
344 hwmods = kmemdup(ohs, sizeof(struct omap_hwmod *) * oh_cnt, GFP_KERNEL);
345 if (!hwmods)
346 goto oda_exit2;
347
348 od->hwmods = hwmods;
349 od->pdev = pdev;
350 pdev->archdata.od = od;
351
352 for (i = 0; i < oh_cnt; i++) {
353 hwmods[i]->od = od;
354 _add_hwmod_clocks_clkdev(od, hwmods[i]);
355 }
356
357 return od;
358
359oda_exit2:
360 kfree(od);
361oda_exit1:
362 dev_err(&pdev->dev, "omap_device: build failed (%d)\n", ret);
363
364 return ERR_PTR(ret);
365}
366
367void omap_device_delete(struct omap_device *od)
368{
369 if (!od)
370 return;
371
372 od->pdev->archdata.od = NULL;
373 kfree(od->hwmods);
374 kfree(od);
375}
376
377#ifdef CONFIG_PM
378static int _od_runtime_suspend(struct device *dev)
379{
380 struct platform_device *pdev = to_platform_device(dev);
381 int ret;
382
383 ret = pm_generic_runtime_suspend(dev);
384 if (ret)
385 return ret;
386
387 return omap_device_idle(pdev);
388}
389
390static int _od_runtime_resume(struct device *dev)
391{
392 struct platform_device *pdev = to_platform_device(dev);
393 int ret;
394
395 ret = omap_device_enable(pdev);
396 if (ret) {
397 dev_err(dev, "use pm_runtime_put_sync_suspend() in driver?\n");
398 return ret;
399 }
400
401 return pm_generic_runtime_resume(dev);
402}
403
404static int _od_fail_runtime_suspend(struct device *dev)
405{
406 dev_warn(dev, "%s: FIXME: missing hwmod/omap_dev info\n", __func__);
407 return -ENODEV;
408}
409
410static int _od_fail_runtime_resume(struct device *dev)
411{
412 dev_warn(dev, "%s: FIXME: missing hwmod/omap_dev info\n", __func__);
413 return -ENODEV;
414}
415
416#endif
417
418#ifdef CONFIG_SUSPEND
419static int _od_suspend_noirq(struct device *dev)
420{
421 struct platform_device *pdev = to_platform_device(dev);
422 struct omap_device *od = to_omap_device(pdev);
423 int ret;
424
425 /* Don't attempt late suspend on a driver that is not bound */
426 if (od->_driver_status != BUS_NOTIFY_BOUND_DRIVER)
427 return 0;
428
429 ret = pm_generic_suspend_noirq(dev);
430
431 if (!ret && !pm_runtime_status_suspended(dev)) {
432 if (pm_generic_runtime_suspend(dev) == 0) {
433 omap_device_idle(pdev);
434 od->flags |= OMAP_DEVICE_SUSPENDED;
435 }
436 }
437
438 return ret;
439}
440
441static int _od_resume_noirq(struct device *dev)
442{
443 struct platform_device *pdev = to_platform_device(dev);
444 struct omap_device *od = to_omap_device(pdev);
445
446 if (od->flags & OMAP_DEVICE_SUSPENDED) {
447 od->flags &= ~OMAP_DEVICE_SUSPENDED;
448 omap_device_enable(pdev);
449 pm_generic_runtime_resume(dev);
450 }
451
452 return pm_generic_resume_noirq(dev);
453}
454#else
455#define _od_suspend_noirq NULL
456#define _od_resume_noirq NULL
457#endif
458
459struct dev_pm_domain omap_device_fail_pm_domain = {
460 .ops = {
461 SET_RUNTIME_PM_OPS(_od_fail_runtime_suspend,
462 _od_fail_runtime_resume, NULL)
463 }
464};
465
466struct dev_pm_domain omap_device_pm_domain = {
467 .ops = {
468 SET_RUNTIME_PM_OPS(_od_runtime_suspend, _od_runtime_resume,
469 NULL)
470 USE_PLATFORM_PM_SLEEP_OPS
471 SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(_od_suspend_noirq,
472 _od_resume_noirq)
473 }
474};
475
476/**
477 * omap_device_register - register an omap_device with one omap_hwmod
478 * @pdev: the platform device (omap_device) to register.
479 *
480 * Register the omap_device structure. This currently just calls
481 * platform_device_register() on the underlying platform_device.
482 * Returns the return value of platform_device_register().
483 */
484int omap_device_register(struct platform_device *pdev)
485{
486 pr_debug("omap_device: %s: registering\n", pdev->name);
487
488 dev_pm_domain_set(&pdev->dev, &omap_device_pm_domain);
489 return platform_device_add(pdev);
490}
491
492
493/* Public functions for use by device drivers through struct platform_data */
494
495/**
496 * omap_device_enable - fully activate an omap_device
497 * @pdev: the platform device to activate
498 *
499 * Do whatever is necessary for the hwmods underlying omap_device @od
500 * to be accessible and ready to operate. This generally involves
501 * enabling clocks, setting SYSCONFIG registers; and in the future may
502 * involve remuxing pins. Device drivers should call this function
503 * indirectly via pm_runtime_get*(). Returns -EINVAL if called when
504 * the omap_device is already enabled, or passes along the return
505 * value of _omap_device_enable_hwmods().
506 */
507int omap_device_enable(struct platform_device *pdev)
508{
509 int ret;
510 struct omap_device *od;
511
512 od = to_omap_device(pdev);
513
514 if (od->_state == OMAP_DEVICE_STATE_ENABLED) {
515 dev_warn(&pdev->dev,
516 "omap_device: %s() called from invalid state %d\n",
517 __func__, od->_state);
518 return -EINVAL;
519 }
520
521 ret = _omap_device_enable_hwmods(od);
522
523 if (ret == 0)
524 od->_state = OMAP_DEVICE_STATE_ENABLED;
525
526 return ret;
527}
528
529/**
530 * omap_device_idle - idle an omap_device
531 * @pdev: The platform_device (omap_device) to idle
532 *
533 * Idle omap_device @od. Device drivers call this function indirectly
534 * via pm_runtime_put*(). Returns -EINVAL if the omap_device is not
535 * currently enabled, or passes along the return value of
536 * _omap_device_idle_hwmods().
537 */
538int omap_device_idle(struct platform_device *pdev)
539{
540 int ret;
541 struct omap_device *od;
542
543 od = to_omap_device(pdev);
544
545 if (od->_state != OMAP_DEVICE_STATE_ENABLED) {
546 dev_warn(&pdev->dev,
547 "omap_device: %s() called from invalid state %d\n",
548 __func__, od->_state);
549 return -EINVAL;
550 }
551
552 ret = _omap_device_idle_hwmods(od);
553
554 if (ret == 0)
555 od->_state = OMAP_DEVICE_STATE_IDLE;
556
557 return ret;
558}
559
560/**
561 * omap_device_assert_hardreset - set a device's hardreset line
562 * @pdev: struct platform_device * to reset
563 * @name: const char * name of the reset line
564 *
565 * Set the hardreset line identified by @name on the IP blocks
566 * associated with the hwmods backing the platform_device @pdev. All
567 * of the hwmods associated with @pdev must have the same hardreset
568 * line linked to them for this to work. Passes along the return value
569 * of omap_hwmod_assert_hardreset() in the event of any failure, or
570 * returns 0 upon success.
571 */
572int omap_device_assert_hardreset(struct platform_device *pdev, const char *name)
573{
574 struct omap_device *od = to_omap_device(pdev);
575 int ret = 0;
576 int i;
577
578 for (i = 0; i < od->hwmods_cnt; i++) {
579 ret = omap_hwmod_assert_hardreset(od->hwmods[i], name);
580 if (ret)
581 break;
582 }
583
584 return ret;
585}
586
587/**
588 * omap_device_deassert_hardreset - release a device's hardreset line
589 * @pdev: struct platform_device * to reset
590 * @name: const char * name of the reset line
591 *
592 * Release the hardreset line identified by @name on the IP blocks
593 * associated with the hwmods backing the platform_device @pdev. All
594 * of the hwmods associated with @pdev must have the same hardreset
595 * line linked to them for this to work. Passes along the return
596 * value of omap_hwmod_deassert_hardreset() in the event of any
597 * failure, or returns 0 upon success.
598 */
599int omap_device_deassert_hardreset(struct platform_device *pdev,
600 const char *name)
601{
602 struct omap_device *od = to_omap_device(pdev);
603 int ret = 0;
604 int i;
605
606 for (i = 0; i < od->hwmods_cnt; i++) {
607 ret = omap_hwmod_deassert_hardreset(od->hwmods[i], name);
608 if (ret)
609 break;
610 }
611
612 return ret;
613}
614
615/**
616 * omap_device_get_by_hwmod_name() - convert a hwmod name to
617 * device pointer.
618 * @oh_name: name of the hwmod device
619 *
620 * Returns back a struct device * pointer associated with a hwmod
621 * device represented by a hwmod_name
622 */
623struct device *omap_device_get_by_hwmod_name(const char *oh_name)
624{
625 struct omap_hwmod *oh;
626
627 if (!oh_name) {
628 WARN(1, "%s: no hwmod name!\n", __func__);
629 return ERR_PTR(-EINVAL);
630 }
631
632 oh = omap_hwmod_lookup(oh_name);
633 if (!oh) {
634 WARN(1, "%s: no hwmod for %s\n", __func__,
635 oh_name);
636 return ERR_PTR(-ENODEV);
637 }
638 if (!oh->od) {
639 WARN(1, "%s: no omap_device for %s\n", __func__,
640 oh_name);
641 return ERR_PTR(-ENODEV);
642 }
643
644 return &oh->od->pdev->dev;
645}
646
647static struct notifier_block platform_nb = {
648 .notifier_call = _omap_device_notifier_call,
649};
650
651static int __init omap_device_init(void)
652{
653 bus_register_notifier(&platform_bus_type, &platform_nb);
654 return 0;
655}
656omap_postcore_initcall(omap_device_init);
657
658/**
659 * omap_device_late_idle - idle devices without drivers
660 * @dev: struct device * associated with omap_device
661 * @data: unused
662 *
663 * Check the driver bound status of this device, and idle it
664 * if there is no driver attached.
665 */
666static int __init omap_device_late_idle(struct device *dev, void *data)
667{
668 struct platform_device *pdev = to_platform_device(dev);
669 struct omap_device *od = to_omap_device(pdev);
670 int i;
671
672 if (!od)
673 return 0;
674
675 /*
676 * If omap_device state is enabled, but has no driver bound,
677 * idle it.
678 */
679
680 /*
681 * Some devices (like memory controllers) are always kept
682 * enabled, and should not be idled even with no drivers.
683 */
684 for (i = 0; i < od->hwmods_cnt; i++)
685 if (od->hwmods[i]->flags & HWMOD_INIT_NO_IDLE)
686 return 0;
687
688 if (od->_driver_status != BUS_NOTIFY_BOUND_DRIVER &&
689 od->_driver_status != BUS_NOTIFY_BIND_DRIVER) {
690 if (od->_state == OMAP_DEVICE_STATE_ENABLED) {
691 dev_warn(dev, "%s: enabled but no driver. Idling\n",
692 __func__);
693 omap_device_idle(pdev);
694 }
695 }
696
697 return 0;
698}
699
700static int __init omap_device_late_init(void)
701{
702 bus_for_each_dev(&platform_bus_type, NULL, NULL, omap_device_late_idle);
703
704 return 0;
705}
706omap_late_initcall_sync(omap_device_late_init);