Merge tag 'locks-v3.16-2' of git://git.samba.org/jlayton/linux
[linux/fpc-iii.git] / arch / arm / mach-omap2 / omap_device.c
blob01ef59def44b86e84a5a1afc1b84d34f0caa17e4
1 /*
2 * omap_device implementation
4 * Copyright (C) 2009-2010 Nokia Corporation
5 * Paul Walmsley, Kevin Hilman
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
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.
16 * This code provides a consistent interface for OMAP device drivers
17 * to control power management and interconnect properties of their
18 * devices.
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
26 #undef DEBUG
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>
39 #include "common.h"
40 #include "soc.h"
41 #include "omap_device.h"
42 #include "omap_hwmod.h"
44 /* Private functions */
46 static void _add_clkdev(struct omap_device *od, const char *clk_alias,
47 const char *clk_name)
49 struct clk *r;
50 struct clk_lookup *l;
52 if (!clk_alias || !clk_name)
53 return;
55 dev_dbg(&od->pdev->dev, "Creating %s -> %s\n", clk_alias, clk_name);
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;
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;
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;
79 clkdev_add(l);
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
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.
92 * The function is called from inside omap_device_build_ss(), after
93 * omap_device_register.
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.
99 * No return value.
101 static void _add_hwmod_clocks_clkdev(struct omap_device *od,
102 struct omap_hwmod *oh)
104 int i;
106 _add_clkdev(od, "fck", oh->main_clk);
108 for (i = 0; i < oh->opt_clks_cnt; i++)
109 _add_clkdev(od, oh->opt_clks[i].role, oh->opt_clks[i].clk);
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
121 * Function for building an omap_device already registered from device-tree
123 * Returns 0 or PTR_ERR() on error.
125 static int omap_device_build_from_dt(struct platform_device *pdev)
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;
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;
141 hwmods = kzalloc(sizeof(struct omap_hwmod *) * oh_cnt, GFP_KERNEL);
142 if (!hwmods) {
143 ret = -ENOMEM;
144 goto odbfd_exit;
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;
156 hwmods[i] = oh;
157 if (oh->flags & HWMOD_INIT_NO_IDLE)
158 device_active = true;
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;
169 /* Fix up missing resource names */
170 for (i = 0; i < pdev->num_resources; i++) {
171 struct resource *r = &pdev->resource[i];
173 if (r->name == NULL)
174 r->name = dev_name(&pdev->dev);
177 pdev->dev.pm_domain = &omap_device_pm_domain;
179 if (device_active) {
180 omap_device_enable(pdev);
181 pm_runtime_set_active(&pdev->dev);
184 odbfd_exit1:
185 kfree(hwmods);
186 odbfd_exit:
187 /* if data/we are at fault.. load up a fail handler */
188 if (ret)
189 pdev->dev.pm_domain = &omap_device_fail_pm_domain;
191 return ret;
194 static int _omap_device_notifier_call(struct notifier_block *nb,
195 unsigned long event, void *dev)
197 struct platform_device *pdev = to_platform_device(dev);
198 struct omap_device *od;
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;
216 return NOTIFY_DONE;
220 * _omap_device_enable_hwmods - call omap_hwmod_enable() on all hwmods
221 * @od: struct omap_device *od
223 * Enable all underlying hwmods. Returns 0.
225 static int _omap_device_enable_hwmods(struct omap_device *od)
227 int i;
229 for (i = 0; i < od->hwmods_cnt; i++)
230 omap_hwmod_enable(od->hwmods[i]);
232 /* XXX pass along return value here? */
233 return 0;
237 * _omap_device_idle_hwmods - call omap_hwmod_idle() on all hwmods
238 * @od: struct omap_device *od
240 * Idle all underlying hwmods. Returns 0.
242 static int _omap_device_idle_hwmods(struct omap_device *od)
244 int i;
246 for (i = 0; i < od->hwmods_cnt; i++)
247 omap_hwmod_idle(od->hwmods[i]);
249 /* XXX pass along return value here? */
250 return 0;
253 /* Public functions for use by core code */
256 * omap_device_get_context_loss_count - get lost context count
257 * @od: struct omap_device *
259 * Using the primary hwmod, query the context loss count for this
260 * device.
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.
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.
270 int omap_device_get_context_loss_count(struct platform_device *pdev)
272 struct omap_device *od;
273 u32 ret = 0;
275 od = to_omap_device(pdev);
277 if (od->hwmods_cnt)
278 ret = omap_hwmod_get_context_loss_count(od->hwmods[0]);
280 return ret;
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)
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.
293 static int omap_device_count_resources(struct omap_device *od,
294 unsigned long flags)
296 int c = 0;
297 int i;
299 for (i = 0; i < od->hwmods_cnt; i++)
300 c += omap_hwmod_count_resources(od->hwmods[i], flags);
302 pr_debug("omap_device: %s: counted %d total resources across %d hwmods\n",
303 od->pdev->name, c, od->hwmods_cnt);
305 return c;
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
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.
325 static int omap_device_fill_resources(struct omap_device *od,
326 struct resource *res)
328 int i, r;
330 for (i = 0; i < od->hwmods_cnt; i++) {
331 r = omap_hwmod_fill_resources(od->hwmods[i], res);
332 res += r;
335 return 0;
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
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().
347 * Ideally this function would not be needed at all. If we have
348 * mechanism to get dma resources from DT.
350 * Returns 0.
352 static int _od_fill_dma_resources(struct omap_device *od,
353 struct resource *res)
355 int i, r;
357 for (i = 0; i < od->hwmods_cnt; i++) {
358 r = omap_hwmod_fill_dma_resources(od->hwmods[i], res);
359 res += r;
362 return 0;
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
372 * Convenience function for allocating an omap_device structure and filling
373 * hwmods, and resources.
375 * Returns an struct omap_device pointer or ERR_PTR() on error;
377 struct omap_device *omap_device_alloc(struct platform_device *pdev,
378 struct omap_hwmod **ohs, int oh_cnt)
380 int ret = -ENOMEM;
381 struct omap_device *od;
382 struct resource *res = NULL;
383 int i, res_count;
384 struct omap_hwmod **hwmods;
386 od = kzalloc(sizeof(struct omap_device), GFP_KERNEL);
387 if (!od) {
388 ret = -ENOMEM;
389 goto oda_exit1;
391 od->hwmods_cnt = oh_cnt;
393 hwmods = kmemdup(ohs, sizeof(struct omap_hwmod *) * oh_cnt, GFP_KERNEL);
394 if (!hwmods)
395 goto oda_exit2;
397 od->hwmods = hwmods;
398 od->pdev = pdev;
401 * Non-DT Boot:
402 * Here, pdev->num_resources = 0, and we should get all the
403 * resources from hwmod.
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.
416 * TODO: Once DMA resource is available from OF layer, we should
417 * kill filling any resources from hwmod.
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];
429 /* We have it, no need to touch the resources */
430 if (r->flags == IORESOURCE_DMA)
431 goto have_everything;
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;
439 res_count += pdev->num_resources;
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;
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]);
460 ret = platform_device_add_resources(pdev, res, res_count);
461 kfree(res);
463 if (ret)
464 goto oda_exit3;
466 have_everything:
467 pdev->archdata.od = od;
469 for (i = 0; i < oh_cnt; i++) {
470 hwmods[i]->od = od;
471 _add_hwmod_clocks_clkdev(od, hwmods[i]);
474 return od;
476 oda_exit3:
477 kfree(hwmods);
478 oda_exit2:
479 kfree(od);
480 oda_exit1:
481 dev_err(&pdev->dev, "omap_device: build failed (%d)\n", ret);
483 return ERR_PTR(ret);
486 void omap_device_delete(struct omap_device *od)
488 if (!od)
489 return;
491 od->pdev->archdata.od = NULL;
492 kfree(od->hwmods);
493 kfree(od);
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
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().
510 struct platform_device __init *omap_device_build(const char *pdev_name,
511 int pdev_id,
512 struct omap_hwmod *oh,
513 void *pdata, int pdata_len)
515 struct omap_hwmod *ohs[] = { oh };
517 if (!oh)
518 return ERR_PTR(-EINVAL);
520 return omap_device_build_ss(pdev_name, pdev_id, ohs, 1, pdata,
521 pdata_len);
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
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().
538 struct platform_device __init *omap_device_build_ss(const char *pdev_name,
539 int pdev_id,
540 struct omap_hwmod **ohs,
541 int oh_cnt, void *pdata,
542 int pdata_len)
544 int ret = -ENOMEM;
545 struct platform_device *pdev;
546 struct omap_device *od;
548 if (!ohs || oh_cnt == 0 || !pdev_name)
549 return ERR_PTR(-EINVAL);
551 if (!pdata && pdata_len > 0)
552 return ERR_PTR(-EINVAL);
554 pdev = platform_device_alloc(pdev_name, pdev_id);
555 if (!pdev) {
556 ret = -ENOMEM;
557 goto odbs_exit;
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);
566 od = omap_device_alloc(pdev, ohs, oh_cnt);
567 if (IS_ERR(od))
568 goto odbs_exit1;
570 ret = platform_device_add_data(pdev, pdata, pdata_len);
571 if (ret)
572 goto odbs_exit2;
574 ret = omap_device_register(pdev);
575 if (ret)
576 goto odbs_exit2;
578 return pdev;
580 odbs_exit2:
581 omap_device_delete(od);
582 odbs_exit1:
583 platform_device_put(pdev);
584 odbs_exit:
586 pr_err("omap_device: %s: build failed (%d)\n", pdev_name, ret);
588 return ERR_PTR(ret);
591 #ifdef CONFIG_PM_RUNTIME
592 static int _od_runtime_suspend(struct device *dev)
594 struct platform_device *pdev = to_platform_device(dev);
595 int ret;
597 ret = pm_generic_runtime_suspend(dev);
599 if (!ret)
600 omap_device_idle(pdev);
602 return ret;
605 static int _od_runtime_resume(struct device *dev)
607 struct platform_device *pdev = to_platform_device(dev);
609 omap_device_enable(pdev);
611 return pm_generic_runtime_resume(dev);
614 static int _od_fail_runtime_suspend(struct device *dev)
616 dev_warn(dev, "%s: FIXME: missing hwmod/omap_dev info\n", __func__);
617 return -ENODEV;
620 static int _od_fail_runtime_resume(struct device *dev)
622 dev_warn(dev, "%s: FIXME: missing hwmod/omap_dev info\n", __func__);
623 return -ENODEV;
626 #endif
628 #ifdef CONFIG_SUSPEND
629 static int _od_suspend_noirq(struct device *dev)
631 struct platform_device *pdev = to_platform_device(dev);
632 struct omap_device *od = to_omap_device(pdev);
633 int ret;
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;
639 ret = pm_generic_suspend_noirq(dev);
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;
649 return ret;
652 static int _od_resume_noirq(struct device *dev)
654 struct platform_device *pdev = to_platform_device(dev);
655 struct omap_device *od = to_omap_device(pdev);
657 if (od->flags & OMAP_DEVICE_SUSPENDED) {
658 od->flags &= ~OMAP_DEVICE_SUSPENDED;
659 omap_device_enable(pdev);
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
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);
672 return pm_generic_resume_noirq(dev);
674 #else
675 #define _od_suspend_noirq NULL
676 #define _od_resume_noirq NULL
677 #endif
679 struct dev_pm_domain omap_device_fail_pm_domain = {
680 .ops = {
681 SET_RUNTIME_PM_OPS(_od_fail_runtime_suspend,
682 _od_fail_runtime_resume, NULL)
686 struct dev_pm_domain omap_device_pm_domain = {
687 .ops = {
688 SET_RUNTIME_PM_OPS(_od_runtime_suspend, _od_runtime_resume,
689 NULL)
690 USE_PLATFORM_PM_SLEEP_OPS
691 .suspend_noirq = _od_suspend_noirq,
692 .resume_noirq = _od_resume_noirq,
697 * omap_device_register - register an omap_device with one omap_hwmod
698 * @od: struct omap_device * to register
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().
704 int omap_device_register(struct platform_device *pdev)
706 pr_debug("omap_device: %s: registering\n", pdev->name);
708 pdev->dev.pm_domain = &omap_device_pm_domain;
709 return platform_device_add(pdev);
713 /* Public functions for use by device drivers through struct platform_data */
716 * omap_device_enable - fully activate an omap_device
717 * @od: struct omap_device * to activate
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().
727 int omap_device_enable(struct platform_device *pdev)
729 int ret;
730 struct omap_device *od;
732 od = to_omap_device(pdev);
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;
741 ret = _omap_device_enable_hwmods(od);
743 od->_state = OMAP_DEVICE_STATE_ENABLED;
745 return ret;
749 * omap_device_idle - idle an omap_device
750 * @od: struct omap_device * to idle
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().
757 int omap_device_idle(struct platform_device *pdev)
759 int ret;
760 struct omap_device *od;
762 od = to_omap_device(pdev);
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;
771 ret = _omap_device_idle_hwmods(od);
773 od->_state = OMAP_DEVICE_STATE_IDLE;
775 return ret;
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
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.
790 int omap_device_assert_hardreset(struct platform_device *pdev, const char *name)
792 struct omap_device *od = to_omap_device(pdev);
793 int ret = 0;
794 int i;
796 for (i = 0; i < od->hwmods_cnt; i++) {
797 ret = omap_hwmod_assert_hardreset(od->hwmods[i], name);
798 if (ret)
799 break;
802 return ret;
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
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.
817 int omap_device_deassert_hardreset(struct platform_device *pdev,
818 const char *name)
820 struct omap_device *od = to_omap_device(pdev);
821 int ret = 0;
822 int i;
824 for (i = 0; i < od->hwmods_cnt; i++) {
825 ret = omap_hwmod_deassert_hardreset(od->hwmods[i], name);
826 if (ret)
827 break;
830 return ret;
834 * omap_device_get_by_hwmod_name() - convert a hwmod name to
835 * device pointer.
836 * @oh_name: name of the hwmod device
838 * Returns back a struct device * pointer associated with a hwmod
839 * device represented by a hwmod_name
841 struct device *omap_device_get_by_hwmod_name(const char *oh_name)
843 struct omap_hwmod *oh;
845 if (!oh_name) {
846 WARN(1, "%s: no hwmod name!\n", __func__);
847 return ERR_PTR(-EINVAL);
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);
856 if (!oh->od) {
857 WARN(1, "%s: no omap_device for %s\n", __func__,
858 oh_name);
859 return ERR_PTR(-ENODEV);
862 return &oh->od->pdev->dev;
865 static struct notifier_block platform_nb = {
866 .notifier_call = _omap_device_notifier_call,
869 static int __init omap_device_init(void)
871 bus_register_notifier(&platform_bus_type, &platform_nb);
872 return 0;
874 omap_core_initcall(omap_device_init);
877 * omap_device_late_idle - idle devices without drivers
878 * @dev: struct device * associated with omap_device
879 * @data: unused
881 * Check the driver bound status of this device, and idle it
882 * if there is no driver attached.
884 static int __init omap_device_late_idle(struct device *dev, void *data)
886 struct platform_device *pdev = to_platform_device(dev);
887 struct omap_device *od = to_omap_device(pdev);
888 int i;
890 if (!od)
891 return 0;
894 * If omap_device state is enabled, but has no driver bound,
895 * idle it.
899 * Some devices (like memory controllers) are always kept
900 * enabled, and should not be idled even with no drivers.
902 for (i = 0; i < od->hwmods_cnt; i++)
903 if (od->hwmods[i]->flags & HWMOD_INIT_NO_IDLE)
904 return 0;
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);
914 return 0;
917 static int __init omap_device_late_init(void)
919 bus_for_each_dev(&platform_bus_type, NULL, NULL, omap_device_late_idle);
920 return 0;
922 omap_late_initcall_sync(omap_device_late_init);