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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
46static 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_warn(&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 */
101static 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 */
125static 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
184odbfd_exit1:
185 kfree(hwmods);
186odbfd_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
194static 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 */
225static 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 */
242static 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 */
270int 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 */
293static 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 */
325static 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 */
352static 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 */
377struct 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
466have_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
476oda_exit3:
477 kfree(hwmods);
478oda_exit2:
479 kfree(od);
480oda_exit1:
481 dev_err(&pdev->dev, "omap_device: build failed (%d)\n", ret);
482
483 return ERR_PTR(ret);
484}
485
486void 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 */
510struct 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 */
538struct 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
580odbs_exit2:
581 omap_device_delete(od);
582odbs_exit1:
583 platform_device_put(pdev);
584odbs_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_RUNTIME
592static 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
605static 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
614static 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
620static 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
629static 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
652static 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
679struct 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
686struct 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 }
694};
695
696/**
697 * omap_device_register - register an omap_device with one omap_hwmod
698 * @od: struct omap_device * to register
699 *
700 * Register the omap_device structure. This currently just calls
701 * platform_device_register() on the underlying platform_device.
702 * Returns the return value of platform_device_register().
703 */
704int omap_device_register(struct platform_device *pdev)
705{
706 pr_debug("omap_device: %s: registering\n", pdev->name);
707
708 pdev->dev.pm_domain = &omap_device_pm_domain;
709 return platform_device_add(pdev);
710}
711
712
713/* Public functions for use by device drivers through struct platform_data */
714
715/**
716 * omap_device_enable - fully activate an omap_device
717 * @od: struct omap_device * to activate
718 *
719 * Do whatever is necessary for the hwmods underlying omap_device @od
720 * to be accessible and ready to operate. This generally involves
721 * enabling clocks, setting SYSCONFIG registers; and in the future may
722 * involve remuxing pins. Device drivers should call this function
723 * indirectly via pm_runtime_get*(). Returns -EINVAL if called when
724 * the omap_device is already enabled, or passes along the return
725 * value of _omap_device_enable_hwmods().
726 */
727int omap_device_enable(struct platform_device *pdev)
728{
729 int ret;
730 struct omap_device *od;
731
732 od = to_omap_device(pdev);
733
734 if (od->_state == OMAP_DEVICE_STATE_ENABLED) {
735 dev_warn(&pdev->dev,
736 "omap_device: %s() called from invalid state %d\n",
737 __func__, od->_state);
738 return -EINVAL;
739 }
740
741 ret = _omap_device_enable_hwmods(od);
742
743 od->_state = OMAP_DEVICE_STATE_ENABLED;
744
745 return ret;
746}
747
748/**
749 * omap_device_idle - idle an omap_device
750 * @od: struct omap_device * to idle
751 *
752 * Idle omap_device @od. Device drivers call this function indirectly
753 * via pm_runtime_put*(). Returns -EINVAL if the omap_device is not
754 * currently enabled, or passes along the return value of
755 * _omap_device_idle_hwmods().
756 */
757int omap_device_idle(struct platform_device *pdev)
758{
759 int ret;
760 struct omap_device *od;
761
762 od = to_omap_device(pdev);
763
764 if (od->_state != OMAP_DEVICE_STATE_ENABLED) {
765 dev_warn(&pdev->dev,
766 "omap_device: %s() called from invalid state %d\n",
767 __func__, od->_state);
768 return -EINVAL;
769 }
770
771 ret = _omap_device_idle_hwmods(od);
772
773 od->_state = OMAP_DEVICE_STATE_IDLE;
774
775 return ret;
776}
777
778/**
779 * omap_device_assert_hardreset - set a device's hardreset line
780 * @pdev: struct platform_device * to reset
781 * @name: const char * name of the reset line
782 *
783 * Set the hardreset line identified by @name on the IP blocks
784 * associated with the hwmods backing the platform_device @pdev. All
785 * of the hwmods associated with @pdev must have the same hardreset
786 * line linked to them for this to work. Passes along the return value
787 * of omap_hwmod_assert_hardreset() in the event of any failure, or
788 * returns 0 upon success.
789 */
790int omap_device_assert_hardreset(struct platform_device *pdev, const char *name)
791{
792 struct omap_device *od = to_omap_device(pdev);
793 int ret = 0;
794 int i;
795
796 for (i = 0; i < od->hwmods_cnt; i++) {
797 ret = omap_hwmod_assert_hardreset(od->hwmods[i], name);
798 if (ret)
799 break;
800 }
801
802 return ret;
803}
804
805/**
806 * omap_device_deassert_hardreset - release a device's hardreset line
807 * @pdev: struct platform_device * to reset
808 * @name: const char * name of the reset line
809 *
810 * Release the hardreset line identified by @name on the IP blocks
811 * associated with the hwmods backing the platform_device @pdev. All
812 * of the hwmods associated with @pdev must have the same hardreset
813 * line linked to them for this to work. Passes along the return
814 * value of omap_hwmod_deassert_hardreset() in the event of any
815 * failure, or returns 0 upon success.
816 */
817int omap_device_deassert_hardreset(struct platform_device *pdev,
818 const char *name)
819{
820 struct omap_device *od = to_omap_device(pdev);
821 int ret = 0;
822 int i;
823
824 for (i = 0; i < od->hwmods_cnt; i++) {
825 ret = omap_hwmod_deassert_hardreset(od->hwmods[i], name);
826 if (ret)
827 break;
828 }
829
830 return ret;
831}
832
833/**
834 * omap_device_get_by_hwmod_name() - convert a hwmod name to
835 * device pointer.
836 * @oh_name: name of the hwmod device
837 *
838 * Returns back a struct device * pointer associated with a hwmod
839 * device represented by a hwmod_name
840 */
841struct device *omap_device_get_by_hwmod_name(const char *oh_name)
842{
843 struct omap_hwmod *oh;
844
845 if (!oh_name) {
846 WARN(1, "%s: no hwmod name!\n", __func__);
847 return ERR_PTR(-EINVAL);
848 }
849
850 oh = omap_hwmod_lookup(oh_name);
851 if (!oh) {
852 WARN(1, "%s: no hwmod for %s\n", __func__,
853 oh_name);
854 return ERR_PTR(-ENODEV);
855 }
856 if (!oh->od) {
857 WARN(1, "%s: no omap_device for %s\n", __func__,
858 oh_name);
859 return ERR_PTR(-ENODEV);
860 }
861
862 return &oh->od->pdev->dev;
863}
864
865static struct notifier_block platform_nb = {
866 .notifier_call = _omap_device_notifier_call,
867};
868
869static int __init omap_device_init(void)
870{
871 bus_register_notifier(&platform_bus_type, &platform_nb);
872 return 0;
873}
874omap_core_initcall(omap_device_init);
875
876/**
877 * omap_device_late_idle - idle devices without drivers
878 * @dev: struct device * associated with omap_device
879 * @data: unused
880 *
881 * Check the driver bound status of this device, and idle it
882 * if there is no driver attached.
883 */
884static int __init omap_device_late_idle(struct device *dev, void *data)
885{
886 struct platform_device *pdev = to_platform_device(dev);
887 struct omap_device *od = to_omap_device(pdev);
888 int i;
889
890 if (!od)
891 return 0;
892
893 /*
894 * If omap_device state is enabled, but has no driver bound,
895 * idle it.
896 */
897
898 /*
899 * Some devices (like memory controllers) are always kept
900 * enabled, and should not be idled even with no drivers.
901 */
902 for (i = 0; i < od->hwmods_cnt; i++)
903 if (od->hwmods[i]->flags & HWMOD_INIT_NO_IDLE)
904 return 0;
905
906 if (od->_driver_status != BUS_NOTIFY_BOUND_DRIVER) {
907 if (od->_state == OMAP_DEVICE_STATE_ENABLED) {
908 dev_warn(dev, "%s: enabled but no driver. Idling\n",
909 __func__);
910 omap_device_idle(pdev);
911 }
912 }
913
914 return 0;
915}
916
917static int __init omap_device_late_init(void)
918{
919 bus_for_each_dev(&platform_bus_type, NULL, NULL, omap_device_late_idle);
920 return 0;
921}
922omap_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 && (od->_state == OMAP_DEVICE_STATE_ENABLED) &&
234 pm_runtime_status_suspended(dev)) {
235 od->_driver_status = BUS_NOTIFY_BIND_DRIVER;
236 pm_runtime_set_active(dev);
237 }
238 break;
239 case BUS_NOTIFY_ADD_DEVICE:
240 if (pdev->dev.of_node)
241 omap_device_build_from_dt(pdev);
242 omap_auxdata_legacy_init(dev);
243 fallthrough;
244 default:
245 od = to_omap_device(pdev);
246 if (od)
247 od->_driver_status = event;
248 }
249
250 return NOTIFY_DONE;
251}
252
253/**
254 * _omap_device_enable_hwmods - call omap_hwmod_enable() on all hwmods
255 * @od: struct omap_device *od
256 *
257 * Enable all underlying hwmods. Returns 0.
258 */
259static int _omap_device_enable_hwmods(struct omap_device *od)
260{
261 int ret = 0;
262 int i;
263
264 for (i = 0; i < od->hwmods_cnt; i++)
265 ret |= omap_hwmod_enable(od->hwmods[i]);
266
267 return ret;
268}
269
270/**
271 * _omap_device_idle_hwmods - call omap_hwmod_idle() on all hwmods
272 * @od: struct omap_device *od
273 *
274 * Idle all underlying hwmods. Returns 0.
275 */
276static int _omap_device_idle_hwmods(struct omap_device *od)
277{
278 int ret = 0;
279 int i;
280
281 for (i = 0; i < od->hwmods_cnt; i++)
282 ret |= omap_hwmod_idle(od->hwmods[i]);
283
284 return ret;
285}
286
287/* Public functions for use by core code */
288
289/**
290 * omap_device_get_context_loss_count - get lost context count
291 * @pdev: The platform device to update.
292 *
293 * Using the primary hwmod, query the context loss count for this
294 * device.
295 *
296 * Callers should consider context for this device lost any time this
297 * function returns a value different than the value the caller got
298 * the last time it called this function.
299 *
300 * If any hwmods exist for the omap_device associated with @pdev,
301 * return the context loss counter for that hwmod, otherwise return
302 * zero.
303 */
304int omap_device_get_context_loss_count(struct platform_device *pdev)
305{
306 struct omap_device *od;
307 u32 ret = 0;
308
309 od = to_omap_device(pdev);
310
311 if (od->hwmods_cnt)
312 ret = omap_hwmod_get_context_loss_count(od->hwmods[0]);
313
314 return ret;
315}
316
317/**
318 * omap_device_alloc - allocate an omap_device
319 * @pdev: platform_device that will be included in this omap_device
320 * @ohs: ptr to the omap_hwmod for this omap_device
321 * @oh_cnt: the size of the ohs list
322 *
323 * Convenience function for allocating an omap_device structure and filling
324 * hwmods, and resources.
325 *
326 * Returns an struct omap_device pointer or ERR_PTR() on error;
327 */
328struct omap_device *omap_device_alloc(struct platform_device *pdev,
329 struct omap_hwmod **ohs, int oh_cnt)
330{
331 int ret = -ENOMEM;
332 struct omap_device *od;
333 int i;
334 struct omap_hwmod **hwmods;
335
336 od = kzalloc(sizeof(struct omap_device), GFP_KERNEL);
337 if (!od) {
338 ret = -ENOMEM;
339 goto oda_exit1;
340 }
341 od->hwmods_cnt = oh_cnt;
342
343 hwmods = kmemdup(ohs, sizeof(struct omap_hwmod *) * oh_cnt, GFP_KERNEL);
344 if (!hwmods)
345 goto oda_exit2;
346
347 od->hwmods = hwmods;
348 od->pdev = pdev;
349 pdev->archdata.od = od;
350
351 for (i = 0; i < oh_cnt; i++) {
352 hwmods[i]->od = od;
353 _add_hwmod_clocks_clkdev(od, hwmods[i]);
354 }
355
356 return od;
357
358oda_exit2:
359 kfree(od);
360oda_exit1:
361 dev_err(&pdev->dev, "omap_device: build failed (%d)\n", ret);
362
363 return ERR_PTR(ret);
364}
365
366void omap_device_delete(struct omap_device *od)
367{
368 if (!od)
369 return;
370
371 od->pdev->archdata.od = NULL;
372 kfree(od->hwmods);
373 kfree(od);
374}
375
376#ifdef CONFIG_PM
377static int _od_runtime_suspend(struct device *dev)
378{
379 struct platform_device *pdev = to_platform_device(dev);
380 int ret;
381
382 ret = pm_generic_runtime_suspend(dev);
383 if (ret)
384 return ret;
385
386 return omap_device_idle(pdev);
387}
388
389static int _od_runtime_resume(struct device *dev)
390{
391 struct platform_device *pdev = to_platform_device(dev);
392 int ret;
393
394 ret = omap_device_enable(pdev);
395 if (ret) {
396 dev_err(dev, "use pm_runtime_put_sync_suspend() in driver?\n");
397 return ret;
398 }
399
400 return pm_generic_runtime_resume(dev);
401}
402
403static int _od_fail_runtime_suspend(struct device *dev)
404{
405 dev_warn(dev, "%s: FIXME: missing hwmod/omap_dev info\n", __func__);
406 return -ENODEV;
407}
408
409static int _od_fail_runtime_resume(struct device *dev)
410{
411 dev_warn(dev, "%s: FIXME: missing hwmod/omap_dev info\n", __func__);
412 return -ENODEV;
413}
414
415#endif
416
417#ifdef CONFIG_SUSPEND
418static int _od_suspend_noirq(struct device *dev)
419{
420 struct platform_device *pdev = to_platform_device(dev);
421 struct omap_device *od = to_omap_device(pdev);
422 int ret;
423
424 /* Don't attempt late suspend on a driver that is not bound */
425 if (od->_driver_status != BUS_NOTIFY_BOUND_DRIVER)
426 return 0;
427
428 ret = pm_generic_suspend_noirq(dev);
429
430 if (!ret && !pm_runtime_status_suspended(dev)) {
431 if (pm_generic_runtime_suspend(dev) == 0) {
432 omap_device_idle(pdev);
433 od->flags |= OMAP_DEVICE_SUSPENDED;
434 }
435 }
436
437 return ret;
438}
439
440static int _od_resume_noirq(struct device *dev)
441{
442 struct platform_device *pdev = to_platform_device(dev);
443 struct omap_device *od = to_omap_device(pdev);
444
445 if (od->flags & OMAP_DEVICE_SUSPENDED) {
446 od->flags &= ~OMAP_DEVICE_SUSPENDED;
447 omap_device_enable(pdev);
448 pm_generic_runtime_resume(dev);
449 }
450
451 return pm_generic_resume_noirq(dev);
452}
453#else
454#define _od_suspend_noirq NULL
455#define _od_resume_noirq NULL
456#endif
457
458struct dev_pm_domain omap_device_fail_pm_domain = {
459 .ops = {
460 SET_RUNTIME_PM_OPS(_od_fail_runtime_suspend,
461 _od_fail_runtime_resume, NULL)
462 }
463};
464
465struct dev_pm_domain omap_device_pm_domain = {
466 .ops = {
467 SET_RUNTIME_PM_OPS(_od_runtime_suspend, _od_runtime_resume,
468 NULL)
469 USE_PLATFORM_PM_SLEEP_OPS
470 SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(_od_suspend_noirq,
471 _od_resume_noirq)
472 }
473};
474
475/**
476 * omap_device_register - register an omap_device with one omap_hwmod
477 * @pdev: the platform device (omap_device) to register.
478 *
479 * Register the omap_device structure. This currently just calls
480 * platform_device_register() on the underlying platform_device.
481 * Returns the return value of platform_device_register().
482 */
483int omap_device_register(struct platform_device *pdev)
484{
485 pr_debug("omap_device: %s: registering\n", pdev->name);
486
487 dev_pm_domain_set(&pdev->dev, &omap_device_pm_domain);
488 return platform_device_add(pdev);
489}
490
491
492/* Public functions for use by device drivers through struct platform_data */
493
494/**
495 * omap_device_enable - fully activate an omap_device
496 * @pdev: the platform device to activate
497 *
498 * Do whatever is necessary for the hwmods underlying omap_device @od
499 * to be accessible and ready to operate. This generally involves
500 * enabling clocks, setting SYSCONFIG registers; and in the future may
501 * involve remuxing pins. Device drivers should call this function
502 * indirectly via pm_runtime_get*(). Returns -EINVAL if called when
503 * the omap_device is already enabled, or passes along the return
504 * value of _omap_device_enable_hwmods().
505 */
506int omap_device_enable(struct platform_device *pdev)
507{
508 int ret;
509 struct omap_device *od;
510
511 od = to_omap_device(pdev);
512
513 if (od->_state == OMAP_DEVICE_STATE_ENABLED) {
514 dev_warn(&pdev->dev,
515 "omap_device: %s() called from invalid state %d\n",
516 __func__, od->_state);
517 return -EINVAL;
518 }
519
520 ret = _omap_device_enable_hwmods(od);
521
522 if (ret == 0)
523 od->_state = OMAP_DEVICE_STATE_ENABLED;
524
525 return ret;
526}
527
528/**
529 * omap_device_idle - idle an omap_device
530 * @pdev: The platform_device (omap_device) to idle
531 *
532 * Idle omap_device @od. Device drivers call this function indirectly
533 * via pm_runtime_put*(). Returns -EINVAL if the omap_device is not
534 * currently enabled, or passes along the return value of
535 * _omap_device_idle_hwmods().
536 */
537int omap_device_idle(struct platform_device *pdev)
538{
539 int ret;
540 struct omap_device *od;
541
542 od = to_omap_device(pdev);
543
544 if (od->_state != OMAP_DEVICE_STATE_ENABLED) {
545 dev_warn(&pdev->dev,
546 "omap_device: %s() called from invalid state %d\n",
547 __func__, od->_state);
548 return -EINVAL;
549 }
550
551 ret = _omap_device_idle_hwmods(od);
552
553 if (ret == 0)
554 od->_state = OMAP_DEVICE_STATE_IDLE;
555
556 return ret;
557}
558
559/**
560 * omap_device_assert_hardreset - set a device's hardreset line
561 * @pdev: struct platform_device * to reset
562 * @name: const char * name of the reset line
563 *
564 * Set the hardreset line identified by @name on the IP blocks
565 * associated with the hwmods backing the platform_device @pdev. All
566 * of the hwmods associated with @pdev must have the same hardreset
567 * line linked to them for this to work. Passes along the return value
568 * of omap_hwmod_assert_hardreset() in the event of any failure, or
569 * returns 0 upon success.
570 */
571int omap_device_assert_hardreset(struct platform_device *pdev, const char *name)
572{
573 struct omap_device *od = to_omap_device(pdev);
574 int ret = 0;
575 int i;
576
577 for (i = 0; i < od->hwmods_cnt; i++) {
578 ret = omap_hwmod_assert_hardreset(od->hwmods[i], name);
579 if (ret)
580 break;
581 }
582
583 return ret;
584}
585
586/**
587 * omap_device_deassert_hardreset - release a device's hardreset line
588 * @pdev: struct platform_device * to reset
589 * @name: const char * name of the reset line
590 *
591 * Release the hardreset line identified by @name on the IP blocks
592 * associated with the hwmods backing the platform_device @pdev. All
593 * of the hwmods associated with @pdev must have the same hardreset
594 * line linked to them for this to work. Passes along the return
595 * value of omap_hwmod_deassert_hardreset() in the event of any
596 * failure, or returns 0 upon success.
597 */
598int omap_device_deassert_hardreset(struct platform_device *pdev,
599 const char *name)
600{
601 struct omap_device *od = to_omap_device(pdev);
602 int ret = 0;
603 int i;
604
605 for (i = 0; i < od->hwmods_cnt; i++) {
606 ret = omap_hwmod_deassert_hardreset(od->hwmods[i], name);
607 if (ret)
608 break;
609 }
610
611 return ret;
612}
613
614/**
615 * omap_device_get_by_hwmod_name() - convert a hwmod name to
616 * device pointer.
617 * @oh_name: name of the hwmod device
618 *
619 * Returns back a struct device * pointer associated with a hwmod
620 * device represented by a hwmod_name
621 */
622struct device *omap_device_get_by_hwmod_name(const char *oh_name)
623{
624 struct omap_hwmod *oh;
625
626 if (!oh_name) {
627 WARN(1, "%s: no hwmod name!\n", __func__);
628 return ERR_PTR(-EINVAL);
629 }
630
631 oh = omap_hwmod_lookup(oh_name);
632 if (!oh) {
633 WARN(1, "%s: no hwmod for %s\n", __func__,
634 oh_name);
635 return ERR_PTR(-ENODEV);
636 }
637 if (!oh->od) {
638 WARN(1, "%s: no omap_device for %s\n", __func__,
639 oh_name);
640 return ERR_PTR(-ENODEV);
641 }
642
643 return &oh->od->pdev->dev;
644}
645
646static struct notifier_block platform_nb = {
647 .notifier_call = _omap_device_notifier_call,
648};
649
650static int __init omap_device_init(void)
651{
652 bus_register_notifier(&platform_bus_type, &platform_nb);
653 return 0;
654}
655omap_postcore_initcall(omap_device_init);
656
657/**
658 * omap_device_late_idle - idle devices without drivers
659 * @dev: struct device * associated with omap_device
660 * @data: unused
661 *
662 * Check the driver bound status of this device, and idle it
663 * if there is no driver attached.
664 */
665static int __init omap_device_late_idle(struct device *dev, void *data)
666{
667 struct platform_device *pdev = to_platform_device(dev);
668 struct omap_device *od = to_omap_device(pdev);
669 int i;
670
671 if (!od)
672 return 0;
673
674 /*
675 * If omap_device state is enabled, but has no driver bound,
676 * idle it.
677 */
678
679 /*
680 * Some devices (like memory controllers) are always kept
681 * enabled, and should not be idled even with no drivers.
682 */
683 for (i = 0; i < od->hwmods_cnt; i++)
684 if (od->hwmods[i]->flags & HWMOD_INIT_NO_IDLE)
685 return 0;
686
687 if (od->_driver_status != BUS_NOTIFY_BOUND_DRIVER &&
688 od->_driver_status != BUS_NOTIFY_BIND_DRIVER) {
689 if (od->_state == OMAP_DEVICE_STATE_ENABLED) {
690 dev_warn(dev, "%s: enabled but no driver. Idling\n",
691 __func__);
692 omap_device_idle(pdev);
693 }
694 }
695
696 return 0;
697}
698
699static int __init omap_device_late_init(void)
700{
701 bus_for_each_dev(&platform_bus_type, NULL, NULL, omap_device_late_idle);
702
703 return 0;
704}
705omap_late_initcall_sync(omap_device_late_init);