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