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