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1/*
2 * linux/arch/arm/common/amba.c
3 *
4 * Copyright (C) 2003 Deep Blue Solutions Ltd, All Rights Reserved.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
10#include <linux/module.h>
11#include <linux/init.h>
12#include <linux/device.h>
13#include <linux/string.h>
14#include <linux/slab.h>
15#include <linux/io.h>
16#include <linux/pm.h>
17#include <linux/pm_runtime.h>
18#include <linux/amba/bus.h>
19
20#include <asm/irq.h>
21#include <asm/sizes.h>
22
23#define to_amba_driver(d) container_of(d, struct amba_driver, drv)
24
25static const struct amba_id *
26amba_lookup(const struct amba_id *table, struct amba_device *dev)
27{
28 int ret = 0;
29
30 while (table->mask) {
31 ret = (dev->periphid & table->mask) == table->id;
32 if (ret)
33 break;
34 table++;
35 }
36
37 return ret ? table : NULL;
38}
39
40static int amba_match(struct device *dev, struct device_driver *drv)
41{
42 struct amba_device *pcdev = to_amba_device(dev);
43 struct amba_driver *pcdrv = to_amba_driver(drv);
44
45 return amba_lookup(pcdrv->id_table, pcdev) != NULL;
46}
47
48#ifdef CONFIG_HOTPLUG
49static int amba_uevent(struct device *dev, struct kobj_uevent_env *env)
50{
51 struct amba_device *pcdev = to_amba_device(dev);
52 int retval = 0;
53
54 retval = add_uevent_var(env, "AMBA_ID=%08x", pcdev->periphid);
55 return retval;
56}
57#else
58#define amba_uevent NULL
59#endif
60
61#define amba_attr_func(name,fmt,arg...) \
62static ssize_t name##_show(struct device *_dev, \
63 struct device_attribute *attr, char *buf) \
64{ \
65 struct amba_device *dev = to_amba_device(_dev); \
66 return sprintf(buf, fmt, arg); \
67}
68
69#define amba_attr(name,fmt,arg...) \
70amba_attr_func(name,fmt,arg) \
71static DEVICE_ATTR(name, S_IRUGO, name##_show, NULL)
72
73amba_attr_func(id, "%08x\n", dev->periphid);
74amba_attr(irq0, "%u\n", dev->irq[0]);
75amba_attr(irq1, "%u\n", dev->irq[1]);
76amba_attr_func(resource, "\t%016llx\t%016llx\t%016lx\n",
77 (unsigned long long)dev->res.start, (unsigned long long)dev->res.end,
78 dev->res.flags);
79
80static struct device_attribute amba_dev_attrs[] = {
81 __ATTR_RO(id),
82 __ATTR_RO(resource),
83 __ATTR_NULL,
84};
85
86#ifdef CONFIG_PM_SLEEP
87
88static int amba_legacy_suspend(struct device *dev, pm_message_t mesg)
89{
90 struct amba_driver *adrv = to_amba_driver(dev->driver);
91 struct amba_device *adev = to_amba_device(dev);
92 int ret = 0;
93
94 if (dev->driver && adrv->suspend)
95 ret = adrv->suspend(adev, mesg);
96
97 return ret;
98}
99
100static int amba_legacy_resume(struct device *dev)
101{
102 struct amba_driver *adrv = to_amba_driver(dev->driver);
103 struct amba_device *adev = to_amba_device(dev);
104 int ret = 0;
105
106 if (dev->driver && adrv->resume)
107 ret = adrv->resume(adev);
108
109 return ret;
110}
111
112static int amba_pm_prepare(struct device *dev)
113{
114 struct device_driver *drv = dev->driver;
115 int ret = 0;
116
117 if (drv && drv->pm && drv->pm->prepare)
118 ret = drv->pm->prepare(dev);
119
120 return ret;
121}
122
123static void amba_pm_complete(struct device *dev)
124{
125 struct device_driver *drv = dev->driver;
126
127 if (drv && drv->pm && drv->pm->complete)
128 drv->pm->complete(dev);
129}
130
131#else /* !CONFIG_PM_SLEEP */
132
133#define amba_pm_prepare NULL
134#define amba_pm_complete NULL
135
136#endif /* !CONFIG_PM_SLEEP */
137
138#ifdef CONFIG_SUSPEND
139
140static int amba_pm_suspend(struct device *dev)
141{
142 struct device_driver *drv = dev->driver;
143 int ret = 0;
144
145 if (!drv)
146 return 0;
147
148 if (drv->pm) {
149 if (drv->pm->suspend)
150 ret = drv->pm->suspend(dev);
151 } else {
152 ret = amba_legacy_suspend(dev, PMSG_SUSPEND);
153 }
154
155 return ret;
156}
157
158static int amba_pm_suspend_noirq(struct device *dev)
159{
160 struct device_driver *drv = dev->driver;
161 int ret = 0;
162
163 if (!drv)
164 return 0;
165
166 if (drv->pm) {
167 if (drv->pm->suspend_noirq)
168 ret = drv->pm->suspend_noirq(dev);
169 }
170
171 return ret;
172}
173
174static int amba_pm_resume(struct device *dev)
175{
176 struct device_driver *drv = dev->driver;
177 int ret = 0;
178
179 if (!drv)
180 return 0;
181
182 if (drv->pm) {
183 if (drv->pm->resume)
184 ret = drv->pm->resume(dev);
185 } else {
186 ret = amba_legacy_resume(dev);
187 }
188
189 return ret;
190}
191
192static int amba_pm_resume_noirq(struct device *dev)
193{
194 struct device_driver *drv = dev->driver;
195 int ret = 0;
196
197 if (!drv)
198 return 0;
199
200 if (drv->pm) {
201 if (drv->pm->resume_noirq)
202 ret = drv->pm->resume_noirq(dev);
203 }
204
205 return ret;
206}
207
208#else /* !CONFIG_SUSPEND */
209
210#define amba_pm_suspend NULL
211#define amba_pm_resume NULL
212#define amba_pm_suspend_noirq NULL
213#define amba_pm_resume_noirq NULL
214
215#endif /* !CONFIG_SUSPEND */
216
217#ifdef CONFIG_HIBERNATE_CALLBACKS
218
219static int amba_pm_freeze(struct device *dev)
220{
221 struct device_driver *drv = dev->driver;
222 int ret = 0;
223
224 if (!drv)
225 return 0;
226
227 if (drv->pm) {
228 if (drv->pm->freeze)
229 ret = drv->pm->freeze(dev);
230 } else {
231 ret = amba_legacy_suspend(dev, PMSG_FREEZE);
232 }
233
234 return ret;
235}
236
237static int amba_pm_freeze_noirq(struct device *dev)
238{
239 struct device_driver *drv = dev->driver;
240 int ret = 0;
241
242 if (!drv)
243 return 0;
244
245 if (drv->pm) {
246 if (drv->pm->freeze_noirq)
247 ret = drv->pm->freeze_noirq(dev);
248 }
249
250 return ret;
251}
252
253static int amba_pm_thaw(struct device *dev)
254{
255 struct device_driver *drv = dev->driver;
256 int ret = 0;
257
258 if (!drv)
259 return 0;
260
261 if (drv->pm) {
262 if (drv->pm->thaw)
263 ret = drv->pm->thaw(dev);
264 } else {
265 ret = amba_legacy_resume(dev);
266 }
267
268 return ret;
269}
270
271static int amba_pm_thaw_noirq(struct device *dev)
272{
273 struct device_driver *drv = dev->driver;
274 int ret = 0;
275
276 if (!drv)
277 return 0;
278
279 if (drv->pm) {
280 if (drv->pm->thaw_noirq)
281 ret = drv->pm->thaw_noirq(dev);
282 }
283
284 return ret;
285}
286
287static int amba_pm_poweroff(struct device *dev)
288{
289 struct device_driver *drv = dev->driver;
290 int ret = 0;
291
292 if (!drv)
293 return 0;
294
295 if (drv->pm) {
296 if (drv->pm->poweroff)
297 ret = drv->pm->poweroff(dev);
298 } else {
299 ret = amba_legacy_suspend(dev, PMSG_HIBERNATE);
300 }
301
302 return ret;
303}
304
305static int amba_pm_poweroff_noirq(struct device *dev)
306{
307 struct device_driver *drv = dev->driver;
308 int ret = 0;
309
310 if (!drv)
311 return 0;
312
313 if (drv->pm) {
314 if (drv->pm->poweroff_noirq)
315 ret = drv->pm->poweroff_noirq(dev);
316 }
317
318 return ret;
319}
320
321static int amba_pm_restore(struct device *dev)
322{
323 struct device_driver *drv = dev->driver;
324 int ret = 0;
325
326 if (!drv)
327 return 0;
328
329 if (drv->pm) {
330 if (drv->pm->restore)
331 ret = drv->pm->restore(dev);
332 } else {
333 ret = amba_legacy_resume(dev);
334 }
335
336 return ret;
337}
338
339static int amba_pm_restore_noirq(struct device *dev)
340{
341 struct device_driver *drv = dev->driver;
342 int ret = 0;
343
344 if (!drv)
345 return 0;
346
347 if (drv->pm) {
348 if (drv->pm->restore_noirq)
349 ret = drv->pm->restore_noirq(dev);
350 }
351
352 return ret;
353}
354
355#else /* !CONFIG_HIBERNATE_CALLBACKS */
356
357#define amba_pm_freeze NULL
358#define amba_pm_thaw NULL
359#define amba_pm_poweroff NULL
360#define amba_pm_restore NULL
361#define amba_pm_freeze_noirq NULL
362#define amba_pm_thaw_noirq NULL
363#define amba_pm_poweroff_noirq NULL
364#define amba_pm_restore_noirq NULL
365
366#endif /* !CONFIG_HIBERNATE_CALLBACKS */
367
368#ifdef CONFIG_PM
369
370static const struct dev_pm_ops amba_pm = {
371 .prepare = amba_pm_prepare,
372 .complete = amba_pm_complete,
373 .suspend = amba_pm_suspend,
374 .resume = amba_pm_resume,
375 .freeze = amba_pm_freeze,
376 .thaw = amba_pm_thaw,
377 .poweroff = amba_pm_poweroff,
378 .restore = amba_pm_restore,
379 .suspend_noirq = amba_pm_suspend_noirq,
380 .resume_noirq = amba_pm_resume_noirq,
381 .freeze_noirq = amba_pm_freeze_noirq,
382 .thaw_noirq = amba_pm_thaw_noirq,
383 .poweroff_noirq = amba_pm_poweroff_noirq,
384 .restore_noirq = amba_pm_restore_noirq,
385 SET_RUNTIME_PM_OPS(
386 pm_generic_runtime_suspend,
387 pm_generic_runtime_resume,
388 pm_generic_runtime_idle
389 )
390};
391
392#define AMBA_PM (&amba_pm)
393
394#else /* !CONFIG_PM */
395
396#define AMBA_PM NULL
397
398#endif /* !CONFIG_PM */
399
400/*
401 * Primecells are part of the Advanced Microcontroller Bus Architecture,
402 * so we call the bus "amba".
403 */
404struct bus_type amba_bustype = {
405 .name = "amba",
406 .dev_attrs = amba_dev_attrs,
407 .match = amba_match,
408 .uevent = amba_uevent,
409 .pm = AMBA_PM,
410};
411
412static int __init amba_init(void)
413{
414 return bus_register(&amba_bustype);
415}
416
417postcore_initcall(amba_init);
418
419static int amba_get_enable_pclk(struct amba_device *pcdev)
420{
421 struct clk *pclk = clk_get(&pcdev->dev, "apb_pclk");
422 int ret;
423
424 pcdev->pclk = pclk;
425
426 if (IS_ERR(pclk))
427 return PTR_ERR(pclk);
428
429 ret = clk_enable(pclk);
430 if (ret)
431 clk_put(pclk);
432
433 return ret;
434}
435
436static void amba_put_disable_pclk(struct amba_device *pcdev)
437{
438 struct clk *pclk = pcdev->pclk;
439
440 clk_disable(pclk);
441 clk_put(pclk);
442}
443
444static int amba_get_enable_vcore(struct amba_device *pcdev)
445{
446 struct regulator *vcore = regulator_get(&pcdev->dev, "vcore");
447 int ret;
448
449 pcdev->vcore = vcore;
450
451 if (IS_ERR(vcore)) {
452 /* It is OK not to supply a vcore regulator */
453 if (PTR_ERR(vcore) == -ENODEV)
454 return 0;
455 return PTR_ERR(vcore);
456 }
457
458 ret = regulator_enable(vcore);
459 if (ret) {
460 regulator_put(vcore);
461 pcdev->vcore = ERR_PTR(-ENODEV);
462 }
463
464 return ret;
465}
466
467static void amba_put_disable_vcore(struct amba_device *pcdev)
468{
469 struct regulator *vcore = pcdev->vcore;
470
471 if (!IS_ERR(vcore)) {
472 regulator_disable(vcore);
473 regulator_put(vcore);
474 }
475}
476
477/*
478 * These are the device model conversion veneers; they convert the
479 * device model structures to our more specific structures.
480 */
481static int amba_probe(struct device *dev)
482{
483 struct amba_device *pcdev = to_amba_device(dev);
484 struct amba_driver *pcdrv = to_amba_driver(dev->driver);
485 const struct amba_id *id = amba_lookup(pcdrv->id_table, pcdev);
486 int ret;
487
488 do {
489 ret = amba_get_enable_vcore(pcdev);
490 if (ret)
491 break;
492
493 ret = amba_get_enable_pclk(pcdev);
494 if (ret)
495 break;
496
497 ret = pcdrv->probe(pcdev, id);
498 if (ret == 0)
499 break;
500
501 amba_put_disable_pclk(pcdev);
502 amba_put_disable_vcore(pcdev);
503 } while (0);
504
505 return ret;
506}
507
508static int amba_remove(struct device *dev)
509{
510 struct amba_device *pcdev = to_amba_device(dev);
511 struct amba_driver *drv = to_amba_driver(dev->driver);
512 int ret = drv->remove(pcdev);
513
514 amba_put_disable_pclk(pcdev);
515 amba_put_disable_vcore(pcdev);
516
517 return ret;
518}
519
520static void amba_shutdown(struct device *dev)
521{
522 struct amba_driver *drv = to_amba_driver(dev->driver);
523 drv->shutdown(to_amba_device(dev));
524}
525
526/**
527 * amba_driver_register - register an AMBA device driver
528 * @drv: amba device driver structure
529 *
530 * Register an AMBA device driver with the Linux device model
531 * core. If devices pre-exist, the drivers probe function will
532 * be called.
533 */
534int amba_driver_register(struct amba_driver *drv)
535{
536 drv->drv.bus = &amba_bustype;
537
538#define SETFN(fn) if (drv->fn) drv->drv.fn = amba_##fn
539 SETFN(probe);
540 SETFN(remove);
541 SETFN(shutdown);
542
543 return driver_register(&drv->drv);
544}
545
546/**
547 * amba_driver_unregister - remove an AMBA device driver
548 * @drv: AMBA device driver structure to remove
549 *
550 * Unregister an AMBA device driver from the Linux device
551 * model. The device model will call the drivers remove function
552 * for each device the device driver is currently handling.
553 */
554void amba_driver_unregister(struct amba_driver *drv)
555{
556 driver_unregister(&drv->drv);
557}
558
559
560static void amba_device_release(struct device *dev)
561{
562 struct amba_device *d = to_amba_device(dev);
563
564 if (d->res.parent)
565 release_resource(&d->res);
566 kfree(d);
567}
568
569/**
570 * amba_device_register - register an AMBA device
571 * @dev: AMBA device to register
572 * @parent: parent memory resource
573 *
574 * Setup the AMBA device, reading the cell ID if present.
575 * Claim the resource, and register the AMBA device with
576 * the Linux device manager.
577 */
578int amba_device_register(struct amba_device *dev, struct resource *parent)
579{
580 u32 size;
581 void __iomem *tmp;
582 int i, ret;
583
584 device_initialize(&dev->dev);
585
586 /*
587 * Copy from device_add
588 */
589 if (dev->dev.init_name) {
590 dev_set_name(&dev->dev, "%s", dev->dev.init_name);
591 dev->dev.init_name = NULL;
592 }
593
594 dev->dev.release = amba_device_release;
595 dev->dev.bus = &amba_bustype;
596 dev->dev.dma_mask = &dev->dma_mask;
597 dev->res.name = dev_name(&dev->dev);
598
599 if (!dev->dev.coherent_dma_mask && dev->dma_mask)
600 dev_warn(&dev->dev, "coherent dma mask is unset\n");
601
602 ret = request_resource(parent, &dev->res);
603 if (ret)
604 goto err_out;
605
606 /* Hard-coded primecell ID instead of plug-n-play */
607 if (dev->periphid != 0)
608 goto skip_probe;
609
610 /*
611 * Dynamically calculate the size of the resource
612 * and use this for iomap
613 */
614 size = resource_size(&dev->res);
615 tmp = ioremap(dev->res.start, size);
616 if (!tmp) {
617 ret = -ENOMEM;
618 goto err_release;
619 }
620
621 ret = amba_get_enable_pclk(dev);
622 if (ret == 0) {
623 u32 pid, cid;
624
625 /*
626 * Read pid and cid based on size of resource
627 * they are located at end of region
628 */
629 for (pid = 0, i = 0; i < 4; i++)
630 pid |= (readl(tmp + size - 0x20 + 4 * i) & 255) <<
631 (i * 8);
632 for (cid = 0, i = 0; i < 4; i++)
633 cid |= (readl(tmp + size - 0x10 + 4 * i) & 255) <<
634 (i * 8);
635
636 amba_put_disable_pclk(dev);
637
638 if (cid == AMBA_CID)
639 dev->periphid = pid;
640
641 if (!dev->periphid)
642 ret = -ENODEV;
643 }
644
645 iounmap(tmp);
646
647 if (ret)
648 goto err_release;
649
650 skip_probe:
651 ret = device_add(&dev->dev);
652 if (ret)
653 goto err_release;
654
655 if (dev->irq[0] != NO_IRQ)
656 ret = device_create_file(&dev->dev, &dev_attr_irq0);
657 if (ret == 0 && dev->irq[1] != NO_IRQ)
658 ret = device_create_file(&dev->dev, &dev_attr_irq1);
659 if (ret == 0)
660 return ret;
661
662 device_unregister(&dev->dev);
663
664 err_release:
665 release_resource(&dev->res);
666 err_out:
667 return ret;
668}
669
670/**
671 * amba_device_unregister - unregister an AMBA device
672 * @dev: AMBA device to remove
673 *
674 * Remove the specified AMBA device from the Linux device
675 * manager. All files associated with this object will be
676 * destroyed, and device drivers notified that the device has
677 * been removed. The AMBA device's resources including
678 * the amba_device structure will be freed once all
679 * references to it have been dropped.
680 */
681void amba_device_unregister(struct amba_device *dev)
682{
683 device_unregister(&dev->dev);
684}
685
686
687struct find_data {
688 struct amba_device *dev;
689 struct device *parent;
690 const char *busid;
691 unsigned int id;
692 unsigned int mask;
693};
694
695static int amba_find_match(struct device *dev, void *data)
696{
697 struct find_data *d = data;
698 struct amba_device *pcdev = to_amba_device(dev);
699 int r;
700
701 r = (pcdev->periphid & d->mask) == d->id;
702 if (d->parent)
703 r &= d->parent == dev->parent;
704 if (d->busid)
705 r &= strcmp(dev_name(dev), d->busid) == 0;
706
707 if (r) {
708 get_device(dev);
709 d->dev = pcdev;
710 }
711
712 return r;
713}
714
715/**
716 * amba_find_device - locate an AMBA device given a bus id
717 * @busid: bus id for device (or NULL)
718 * @parent: parent device (or NULL)
719 * @id: peripheral ID (or 0)
720 * @mask: peripheral ID mask (or 0)
721 *
722 * Return the AMBA device corresponding to the supplied parameters.
723 * If no device matches, returns NULL.
724 *
725 * NOTE: When a valid device is found, its refcount is
726 * incremented, and must be decremented before the returned
727 * reference.
728 */
729struct amba_device *
730amba_find_device(const char *busid, struct device *parent, unsigned int id,
731 unsigned int mask)
732{
733 struct find_data data;
734
735 data.dev = NULL;
736 data.parent = parent;
737 data.busid = busid;
738 data.id = id;
739 data.mask = mask;
740
741 bus_for_each_dev(&amba_bustype, NULL, &data, amba_find_match);
742
743 return data.dev;
744}
745
746/**
747 * amba_request_regions - request all mem regions associated with device
748 * @dev: amba_device structure for device
749 * @name: name, or NULL to use driver name
750 */
751int amba_request_regions(struct amba_device *dev, const char *name)
752{
753 int ret = 0;
754 u32 size;
755
756 if (!name)
757 name = dev->dev.driver->name;
758
759 size = resource_size(&dev->res);
760
761 if (!request_mem_region(dev->res.start, size, name))
762 ret = -EBUSY;
763
764 return ret;
765}
766
767/**
768 * amba_release_regions - release mem regions associated with device
769 * @dev: amba_device structure for device
770 *
771 * Release regions claimed by a successful call to amba_request_regions.
772 */
773void amba_release_regions(struct amba_device *dev)
774{
775 u32 size;
776
777 size = resource_size(&dev->res);
778 release_mem_region(dev->res.start, size);
779}
780
781EXPORT_SYMBOL(amba_driver_register);
782EXPORT_SYMBOL(amba_driver_unregister);
783EXPORT_SYMBOL(amba_device_register);
784EXPORT_SYMBOL(amba_device_unregister);
785EXPORT_SYMBOL(amba_find_device);
786EXPORT_SYMBOL(amba_request_regions);
787EXPORT_SYMBOL(amba_release_regions);
1/*
2 * linux/arch/arm/common/amba.c
3 *
4 * Copyright (C) 2003 Deep Blue Solutions Ltd, All Rights Reserved.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
10#include <linux/module.h>
11#include <linux/init.h>
12#include <linux/device.h>
13#include <linux/string.h>
14#include <linux/slab.h>
15#include <linux/io.h>
16#include <linux/pm.h>
17#include <linux/pm_runtime.h>
18#include <linux/amba/bus.h>
19
20#include <asm/irq.h>
21#include <asm/sizes.h>
22
23#define to_amba_driver(d) container_of(d, struct amba_driver, drv)
24
25static const struct amba_id *
26amba_lookup(const struct amba_id *table, struct amba_device *dev)
27{
28 int ret = 0;
29
30 while (table->mask) {
31 ret = (dev->periphid & table->mask) == table->id;
32 if (ret)
33 break;
34 table++;
35 }
36
37 return ret ? table : NULL;
38}
39
40static int amba_match(struct device *dev, struct device_driver *drv)
41{
42 struct amba_device *pcdev = to_amba_device(dev);
43 struct amba_driver *pcdrv = to_amba_driver(drv);
44
45 return amba_lookup(pcdrv->id_table, pcdev) != NULL;
46}
47
48#ifdef CONFIG_HOTPLUG
49static int amba_uevent(struct device *dev, struct kobj_uevent_env *env)
50{
51 struct amba_device *pcdev = to_amba_device(dev);
52 int retval = 0;
53
54 retval = add_uevent_var(env, "AMBA_ID=%08x", pcdev->periphid);
55 if (retval)
56 return retval;
57
58 retval = add_uevent_var(env, "MODALIAS=amba:d%08X", pcdev->periphid);
59 return retval;
60}
61#else
62#define amba_uevent NULL
63#endif
64
65#define amba_attr_func(name,fmt,arg...) \
66static ssize_t name##_show(struct device *_dev, \
67 struct device_attribute *attr, char *buf) \
68{ \
69 struct amba_device *dev = to_amba_device(_dev); \
70 return sprintf(buf, fmt, arg); \
71}
72
73#define amba_attr(name,fmt,arg...) \
74amba_attr_func(name,fmt,arg) \
75static DEVICE_ATTR(name, S_IRUGO, name##_show, NULL)
76
77amba_attr_func(id, "%08x\n", dev->periphid);
78amba_attr(irq0, "%u\n", dev->irq[0]);
79amba_attr(irq1, "%u\n", dev->irq[1]);
80amba_attr_func(resource, "\t%016llx\t%016llx\t%016lx\n",
81 (unsigned long long)dev->res.start, (unsigned long long)dev->res.end,
82 dev->res.flags);
83
84static struct device_attribute amba_dev_attrs[] = {
85 __ATTR_RO(id),
86 __ATTR_RO(resource),
87 __ATTR_NULL,
88};
89
90#ifdef CONFIG_PM_SLEEP
91
92static int amba_legacy_suspend(struct device *dev, pm_message_t mesg)
93{
94 struct amba_driver *adrv = to_amba_driver(dev->driver);
95 struct amba_device *adev = to_amba_device(dev);
96 int ret = 0;
97
98 if (dev->driver && adrv->suspend)
99 ret = adrv->suspend(adev, mesg);
100
101 return ret;
102}
103
104static int amba_legacy_resume(struct device *dev)
105{
106 struct amba_driver *adrv = to_amba_driver(dev->driver);
107 struct amba_device *adev = to_amba_device(dev);
108 int ret = 0;
109
110 if (dev->driver && adrv->resume)
111 ret = adrv->resume(adev);
112
113 return ret;
114}
115
116#endif /* CONFIG_PM_SLEEP */
117
118#ifdef CONFIG_SUSPEND
119
120static int amba_pm_suspend(struct device *dev)
121{
122 struct device_driver *drv = dev->driver;
123 int ret = 0;
124
125 if (!drv)
126 return 0;
127
128 if (drv->pm) {
129 if (drv->pm->suspend)
130 ret = drv->pm->suspend(dev);
131 } else {
132 ret = amba_legacy_suspend(dev, PMSG_SUSPEND);
133 }
134
135 return ret;
136}
137
138static int amba_pm_resume(struct device *dev)
139{
140 struct device_driver *drv = dev->driver;
141 int ret = 0;
142
143 if (!drv)
144 return 0;
145
146 if (drv->pm) {
147 if (drv->pm->resume)
148 ret = drv->pm->resume(dev);
149 } else {
150 ret = amba_legacy_resume(dev);
151 }
152
153 return ret;
154}
155
156#else /* !CONFIG_SUSPEND */
157
158#define amba_pm_suspend NULL
159#define amba_pm_resume NULL
160
161#endif /* !CONFIG_SUSPEND */
162
163#ifdef CONFIG_HIBERNATE_CALLBACKS
164
165static int amba_pm_freeze(struct device *dev)
166{
167 struct device_driver *drv = dev->driver;
168 int ret = 0;
169
170 if (!drv)
171 return 0;
172
173 if (drv->pm) {
174 if (drv->pm->freeze)
175 ret = drv->pm->freeze(dev);
176 } else {
177 ret = amba_legacy_suspend(dev, PMSG_FREEZE);
178 }
179
180 return ret;
181}
182
183static int amba_pm_thaw(struct device *dev)
184{
185 struct device_driver *drv = dev->driver;
186 int ret = 0;
187
188 if (!drv)
189 return 0;
190
191 if (drv->pm) {
192 if (drv->pm->thaw)
193 ret = drv->pm->thaw(dev);
194 } else {
195 ret = amba_legacy_resume(dev);
196 }
197
198 return ret;
199}
200
201static int amba_pm_poweroff(struct device *dev)
202{
203 struct device_driver *drv = dev->driver;
204 int ret = 0;
205
206 if (!drv)
207 return 0;
208
209 if (drv->pm) {
210 if (drv->pm->poweroff)
211 ret = drv->pm->poweroff(dev);
212 } else {
213 ret = amba_legacy_suspend(dev, PMSG_HIBERNATE);
214 }
215
216 return ret;
217}
218
219static int amba_pm_restore(struct device *dev)
220{
221 struct device_driver *drv = dev->driver;
222 int ret = 0;
223
224 if (!drv)
225 return 0;
226
227 if (drv->pm) {
228 if (drv->pm->restore)
229 ret = drv->pm->restore(dev);
230 } else {
231 ret = amba_legacy_resume(dev);
232 }
233
234 return ret;
235}
236
237#else /* !CONFIG_HIBERNATE_CALLBACKS */
238
239#define amba_pm_freeze NULL
240#define amba_pm_thaw NULL
241#define amba_pm_poweroff NULL
242#define amba_pm_restore NULL
243
244#endif /* !CONFIG_HIBERNATE_CALLBACKS */
245
246#ifdef CONFIG_PM_RUNTIME
247/*
248 * Hooks to provide runtime PM of the pclk (bus clock). It is safe to
249 * enable/disable the bus clock at runtime PM suspend/resume as this
250 * does not result in loss of context.
251 */
252static int amba_pm_runtime_suspend(struct device *dev)
253{
254 struct amba_device *pcdev = to_amba_device(dev);
255 int ret = pm_generic_runtime_suspend(dev);
256
257 if (ret == 0 && dev->driver)
258 clk_disable(pcdev->pclk);
259
260 return ret;
261}
262
263static int amba_pm_runtime_resume(struct device *dev)
264{
265 struct amba_device *pcdev = to_amba_device(dev);
266 int ret;
267
268 if (dev->driver) {
269 ret = clk_enable(pcdev->pclk);
270 /* Failure is probably fatal to the system, but... */
271 if (ret)
272 return ret;
273 }
274
275 return pm_generic_runtime_resume(dev);
276}
277#endif
278
279#ifdef CONFIG_PM
280
281static const struct dev_pm_ops amba_pm = {
282 .suspend = amba_pm_suspend,
283 .resume = amba_pm_resume,
284 .freeze = amba_pm_freeze,
285 .thaw = amba_pm_thaw,
286 .poweroff = amba_pm_poweroff,
287 .restore = amba_pm_restore,
288 SET_RUNTIME_PM_OPS(
289 amba_pm_runtime_suspend,
290 amba_pm_runtime_resume,
291 pm_generic_runtime_idle
292 )
293};
294
295#define AMBA_PM (&amba_pm)
296
297#else /* !CONFIG_PM */
298
299#define AMBA_PM NULL
300
301#endif /* !CONFIG_PM */
302
303/*
304 * Primecells are part of the Advanced Microcontroller Bus Architecture,
305 * so we call the bus "amba".
306 */
307struct bus_type amba_bustype = {
308 .name = "amba",
309 .dev_attrs = amba_dev_attrs,
310 .match = amba_match,
311 .uevent = amba_uevent,
312 .pm = AMBA_PM,
313};
314
315static int __init amba_init(void)
316{
317 return bus_register(&amba_bustype);
318}
319
320postcore_initcall(amba_init);
321
322static int amba_get_enable_pclk(struct amba_device *pcdev)
323{
324 struct clk *pclk = clk_get(&pcdev->dev, "apb_pclk");
325 int ret;
326
327 pcdev->pclk = pclk;
328
329 if (IS_ERR(pclk))
330 return PTR_ERR(pclk);
331
332 ret = clk_prepare(pclk);
333 if (ret) {
334 clk_put(pclk);
335 return ret;
336 }
337
338 ret = clk_enable(pclk);
339 if (ret) {
340 clk_unprepare(pclk);
341 clk_put(pclk);
342 }
343
344 return ret;
345}
346
347static void amba_put_disable_pclk(struct amba_device *pcdev)
348{
349 struct clk *pclk = pcdev->pclk;
350
351 clk_disable(pclk);
352 clk_unprepare(pclk);
353 clk_put(pclk);
354}
355
356/*
357 * These are the device model conversion veneers; they convert the
358 * device model structures to our more specific structures.
359 */
360static int amba_probe(struct device *dev)
361{
362 struct amba_device *pcdev = to_amba_device(dev);
363 struct amba_driver *pcdrv = to_amba_driver(dev->driver);
364 const struct amba_id *id = amba_lookup(pcdrv->id_table, pcdev);
365 int ret;
366
367 do {
368 ret = amba_get_enable_pclk(pcdev);
369 if (ret)
370 break;
371
372 pm_runtime_get_noresume(dev);
373 pm_runtime_set_active(dev);
374 pm_runtime_enable(dev);
375
376 ret = pcdrv->probe(pcdev, id);
377 if (ret == 0)
378 break;
379
380 pm_runtime_disable(dev);
381 pm_runtime_set_suspended(dev);
382 pm_runtime_put_noidle(dev);
383
384 amba_put_disable_pclk(pcdev);
385 } while (0);
386
387 return ret;
388}
389
390static int amba_remove(struct device *dev)
391{
392 struct amba_device *pcdev = to_amba_device(dev);
393 struct amba_driver *drv = to_amba_driver(dev->driver);
394 int ret;
395
396 pm_runtime_get_sync(dev);
397 ret = drv->remove(pcdev);
398 pm_runtime_put_noidle(dev);
399
400 /* Undo the runtime PM settings in amba_probe() */
401 pm_runtime_disable(dev);
402 pm_runtime_set_suspended(dev);
403 pm_runtime_put_noidle(dev);
404
405 amba_put_disable_pclk(pcdev);
406
407 return ret;
408}
409
410static void amba_shutdown(struct device *dev)
411{
412 struct amba_driver *drv = to_amba_driver(dev->driver);
413 drv->shutdown(to_amba_device(dev));
414}
415
416/**
417 * amba_driver_register - register an AMBA device driver
418 * @drv: amba device driver structure
419 *
420 * Register an AMBA device driver with the Linux device model
421 * core. If devices pre-exist, the drivers probe function will
422 * be called.
423 */
424int amba_driver_register(struct amba_driver *drv)
425{
426 drv->drv.bus = &amba_bustype;
427
428#define SETFN(fn) if (drv->fn) drv->drv.fn = amba_##fn
429 SETFN(probe);
430 SETFN(remove);
431 SETFN(shutdown);
432
433 return driver_register(&drv->drv);
434}
435
436/**
437 * amba_driver_unregister - remove an AMBA device driver
438 * @drv: AMBA device driver structure to remove
439 *
440 * Unregister an AMBA device driver from the Linux device
441 * model. The device model will call the drivers remove function
442 * for each device the device driver is currently handling.
443 */
444void amba_driver_unregister(struct amba_driver *drv)
445{
446 driver_unregister(&drv->drv);
447}
448
449
450static void amba_device_release(struct device *dev)
451{
452 struct amba_device *d = to_amba_device(dev);
453
454 if (d->res.parent)
455 release_resource(&d->res);
456 kfree(d);
457}
458
459/**
460 * amba_device_add - add a previously allocated AMBA device structure
461 * @dev: AMBA device allocated by amba_device_alloc
462 * @parent: resource parent for this devices resources
463 *
464 * Claim the resource, and read the device cell ID if not already
465 * initialized. Register the AMBA device with the Linux device
466 * manager.
467 */
468int amba_device_add(struct amba_device *dev, struct resource *parent)
469{
470 u32 size;
471 void __iomem *tmp;
472 int i, ret;
473
474 WARN_ON(dev->irq[0] == (unsigned int)-1);
475 WARN_ON(dev->irq[1] == (unsigned int)-1);
476
477 ret = request_resource(parent, &dev->res);
478 if (ret)
479 goto err_out;
480
481 /* Hard-coded primecell ID instead of plug-n-play */
482 if (dev->periphid != 0)
483 goto skip_probe;
484
485 /*
486 * Dynamically calculate the size of the resource
487 * and use this for iomap
488 */
489 size = resource_size(&dev->res);
490 tmp = ioremap(dev->res.start, size);
491 if (!tmp) {
492 ret = -ENOMEM;
493 goto err_release;
494 }
495
496 ret = amba_get_enable_pclk(dev);
497 if (ret == 0) {
498 u32 pid, cid;
499
500 /*
501 * Read pid and cid based on size of resource
502 * they are located at end of region
503 */
504 for (pid = 0, i = 0; i < 4; i++)
505 pid |= (readl(tmp + size - 0x20 + 4 * i) & 255) <<
506 (i * 8);
507 for (cid = 0, i = 0; i < 4; i++)
508 cid |= (readl(tmp + size - 0x10 + 4 * i) & 255) <<
509 (i * 8);
510
511 amba_put_disable_pclk(dev);
512
513 if (cid == AMBA_CID)
514 dev->periphid = pid;
515
516 if (!dev->periphid)
517 ret = -ENODEV;
518 }
519
520 iounmap(tmp);
521
522 if (ret)
523 goto err_release;
524
525 skip_probe:
526 ret = device_add(&dev->dev);
527 if (ret)
528 goto err_release;
529
530 if (dev->irq[0])
531 ret = device_create_file(&dev->dev, &dev_attr_irq0);
532 if (ret == 0 && dev->irq[1])
533 ret = device_create_file(&dev->dev, &dev_attr_irq1);
534 if (ret == 0)
535 return ret;
536
537 device_unregister(&dev->dev);
538
539 err_release:
540 release_resource(&dev->res);
541 err_out:
542 return ret;
543}
544EXPORT_SYMBOL_GPL(amba_device_add);
545
546static struct amba_device *
547amba_aphb_device_add(struct device *parent, const char *name,
548 resource_size_t base, size_t size, int irq1, int irq2,
549 void *pdata, unsigned int periphid, u64 dma_mask)
550{
551 struct amba_device *dev;
552 int ret;
553
554 dev = amba_device_alloc(name, base, size);
555 if (!dev)
556 return ERR_PTR(-ENOMEM);
557
558 dev->dma_mask = dma_mask;
559 dev->dev.coherent_dma_mask = dma_mask;
560 dev->irq[0] = irq1;
561 dev->irq[1] = irq2;
562 dev->periphid = periphid;
563 dev->dev.platform_data = pdata;
564 dev->dev.parent = parent;
565
566 ret = amba_device_add(dev, &iomem_resource);
567 if (ret) {
568 amba_device_put(dev);
569 return ERR_PTR(ret);
570 }
571
572 return dev;
573}
574
575struct amba_device *
576amba_apb_device_add(struct device *parent, const char *name,
577 resource_size_t base, size_t size, int irq1, int irq2,
578 void *pdata, unsigned int periphid)
579{
580 return amba_aphb_device_add(parent, name, base, size, irq1, irq2, pdata,
581 periphid, 0);
582}
583EXPORT_SYMBOL_GPL(amba_apb_device_add);
584
585struct amba_device *
586amba_ahb_device_add(struct device *parent, const char *name,
587 resource_size_t base, size_t size, int irq1, int irq2,
588 void *pdata, unsigned int periphid)
589{
590 return amba_aphb_device_add(parent, name, base, size, irq1, irq2, pdata,
591 periphid, ~0ULL);
592}
593EXPORT_SYMBOL_GPL(amba_ahb_device_add);
594
595static void amba_device_initialize(struct amba_device *dev, const char *name)
596{
597 device_initialize(&dev->dev);
598 if (name)
599 dev_set_name(&dev->dev, "%s", name);
600 dev->dev.release = amba_device_release;
601 dev->dev.bus = &amba_bustype;
602 dev->dev.dma_mask = &dev->dma_mask;
603 dev->res.name = dev_name(&dev->dev);
604}
605
606/**
607 * amba_device_alloc - allocate an AMBA device
608 * @name: sysfs name of the AMBA device
609 * @base: base of AMBA device
610 * @size: size of AMBA device
611 *
612 * Allocate and initialize an AMBA device structure. Returns %NULL
613 * on failure.
614 */
615struct amba_device *amba_device_alloc(const char *name, resource_size_t base,
616 size_t size)
617{
618 struct amba_device *dev;
619
620 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
621 if (dev) {
622 amba_device_initialize(dev, name);
623 dev->res.start = base;
624 dev->res.end = base + size - 1;
625 dev->res.flags = IORESOURCE_MEM;
626 }
627
628 return dev;
629}
630EXPORT_SYMBOL_GPL(amba_device_alloc);
631
632/**
633 * amba_device_register - register an AMBA device
634 * @dev: AMBA device to register
635 * @parent: parent memory resource
636 *
637 * Setup the AMBA device, reading the cell ID if present.
638 * Claim the resource, and register the AMBA device with
639 * the Linux device manager.
640 */
641int amba_device_register(struct amba_device *dev, struct resource *parent)
642{
643 amba_device_initialize(dev, dev->dev.init_name);
644 dev->dev.init_name = NULL;
645
646 if (!dev->dev.coherent_dma_mask && dev->dma_mask)
647 dev_warn(&dev->dev, "coherent dma mask is unset\n");
648
649 return amba_device_add(dev, parent);
650}
651
652/**
653 * amba_device_put - put an AMBA device
654 * @dev: AMBA device to put
655 */
656void amba_device_put(struct amba_device *dev)
657{
658 put_device(&dev->dev);
659}
660EXPORT_SYMBOL_GPL(amba_device_put);
661
662/**
663 * amba_device_unregister - unregister an AMBA device
664 * @dev: AMBA device to remove
665 *
666 * Remove the specified AMBA device from the Linux device
667 * manager. All files associated with this object will be
668 * destroyed, and device drivers notified that the device has
669 * been removed. The AMBA device's resources including
670 * the amba_device structure will be freed once all
671 * references to it have been dropped.
672 */
673void amba_device_unregister(struct amba_device *dev)
674{
675 device_unregister(&dev->dev);
676}
677
678
679struct find_data {
680 struct amba_device *dev;
681 struct device *parent;
682 const char *busid;
683 unsigned int id;
684 unsigned int mask;
685};
686
687static int amba_find_match(struct device *dev, void *data)
688{
689 struct find_data *d = data;
690 struct amba_device *pcdev = to_amba_device(dev);
691 int r;
692
693 r = (pcdev->periphid & d->mask) == d->id;
694 if (d->parent)
695 r &= d->parent == dev->parent;
696 if (d->busid)
697 r &= strcmp(dev_name(dev), d->busid) == 0;
698
699 if (r) {
700 get_device(dev);
701 d->dev = pcdev;
702 }
703
704 return r;
705}
706
707/**
708 * amba_find_device - locate an AMBA device given a bus id
709 * @busid: bus id for device (or NULL)
710 * @parent: parent device (or NULL)
711 * @id: peripheral ID (or 0)
712 * @mask: peripheral ID mask (or 0)
713 *
714 * Return the AMBA device corresponding to the supplied parameters.
715 * If no device matches, returns NULL.
716 *
717 * NOTE: When a valid device is found, its refcount is
718 * incremented, and must be decremented before the returned
719 * reference.
720 */
721struct amba_device *
722amba_find_device(const char *busid, struct device *parent, unsigned int id,
723 unsigned int mask)
724{
725 struct find_data data;
726
727 data.dev = NULL;
728 data.parent = parent;
729 data.busid = busid;
730 data.id = id;
731 data.mask = mask;
732
733 bus_for_each_dev(&amba_bustype, NULL, &data, amba_find_match);
734
735 return data.dev;
736}
737
738/**
739 * amba_request_regions - request all mem regions associated with device
740 * @dev: amba_device structure for device
741 * @name: name, or NULL to use driver name
742 */
743int amba_request_regions(struct amba_device *dev, const char *name)
744{
745 int ret = 0;
746 u32 size;
747
748 if (!name)
749 name = dev->dev.driver->name;
750
751 size = resource_size(&dev->res);
752
753 if (!request_mem_region(dev->res.start, size, name))
754 ret = -EBUSY;
755
756 return ret;
757}
758
759/**
760 * amba_release_regions - release mem regions associated with device
761 * @dev: amba_device structure for device
762 *
763 * Release regions claimed by a successful call to amba_request_regions.
764 */
765void amba_release_regions(struct amba_device *dev)
766{
767 u32 size;
768
769 size = resource_size(&dev->res);
770 release_mem_region(dev->res.start, size);
771}
772
773EXPORT_SYMBOL(amba_driver_register);
774EXPORT_SYMBOL(amba_driver_unregister);
775EXPORT_SYMBOL(amba_device_register);
776EXPORT_SYMBOL(amba_device_unregister);
777EXPORT_SYMBOL(amba_find_device);
778EXPORT_SYMBOL(amba_request_regions);
779EXPORT_SYMBOL(amba_release_regions);