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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/pm_domain.h>
19#include <linux/amba/bus.h>
20#include <linux/sizes.h>
21#include <linux/limits.h>
22#include <linux/clk/clk-conf.h>
23#include <linux/platform_device.h>
24
25#include <asm/irq.h>
26
27#define to_amba_driver(d) container_of(d, struct amba_driver, drv)
28
29/* called on periphid match and class 0x9 coresight device. */
30static int
31amba_cs_uci_id_match(const struct amba_id *table, struct amba_device *dev)
32{
33 int ret = 0;
34 struct amba_cs_uci_id *uci;
35
36 uci = table->data;
37
38 /* no table data or zero mask - return match on periphid */
39 if (!uci || (uci->devarch_mask == 0))
40 return 1;
41
42 /* test against read devtype and masked devarch value */
43 ret = (dev->uci.devtype == uci->devtype) &&
44 ((dev->uci.devarch & uci->devarch_mask) == uci->devarch);
45 return ret;
46}
47
48static const struct amba_id *
49amba_lookup(const struct amba_id *table, struct amba_device *dev)
50{
51 while (table->mask) {
52 if (((dev->periphid & table->mask) == table->id) &&
53 ((dev->cid != CORESIGHT_CID) ||
54 (amba_cs_uci_id_match(table, dev))))
55 return table;
56 table++;
57 }
58 return NULL;
59}
60
61static int amba_match(struct device *dev, struct device_driver *drv)
62{
63 struct amba_device *pcdev = to_amba_device(dev);
64 struct amba_driver *pcdrv = to_amba_driver(drv);
65
66 /* When driver_override is set, only bind to the matching driver */
67 if (pcdev->driver_override)
68 return !strcmp(pcdev->driver_override, drv->name);
69
70 return amba_lookup(pcdrv->id_table, pcdev) != NULL;
71}
72
73static int amba_uevent(struct device *dev, struct kobj_uevent_env *env)
74{
75 struct amba_device *pcdev = to_amba_device(dev);
76 int retval = 0;
77
78 retval = add_uevent_var(env, "AMBA_ID=%08x", pcdev->periphid);
79 if (retval)
80 return retval;
81
82 retval = add_uevent_var(env, "MODALIAS=amba:d%08X", pcdev->periphid);
83 return retval;
84}
85
86static ssize_t driver_override_show(struct device *_dev,
87 struct device_attribute *attr, char *buf)
88{
89 struct amba_device *dev = to_amba_device(_dev);
90 ssize_t len;
91
92 device_lock(_dev);
93 len = sprintf(buf, "%s\n", dev->driver_override);
94 device_unlock(_dev);
95 return len;
96}
97
98static ssize_t driver_override_store(struct device *_dev,
99 struct device_attribute *attr,
100 const char *buf, size_t count)
101{
102 struct amba_device *dev = to_amba_device(_dev);
103 char *driver_override, *old, *cp;
104
105 /* We need to keep extra room for a newline */
106 if (count >= (PAGE_SIZE - 1))
107 return -EINVAL;
108
109 driver_override = kstrndup(buf, count, GFP_KERNEL);
110 if (!driver_override)
111 return -ENOMEM;
112
113 cp = strchr(driver_override, '\n');
114 if (cp)
115 *cp = '\0';
116
117 device_lock(_dev);
118 old = dev->driver_override;
119 if (strlen(driver_override)) {
120 dev->driver_override = driver_override;
121 } else {
122 kfree(driver_override);
123 dev->driver_override = NULL;
124 }
125 device_unlock(_dev);
126
127 kfree(old);
128
129 return count;
130}
131static DEVICE_ATTR_RW(driver_override);
132
133#define amba_attr_func(name,fmt,arg...) \
134static ssize_t name##_show(struct device *_dev, \
135 struct device_attribute *attr, char *buf) \
136{ \
137 struct amba_device *dev = to_amba_device(_dev); \
138 return sprintf(buf, fmt, arg); \
139} \
140static DEVICE_ATTR_RO(name)
141
142amba_attr_func(id, "%08x\n", dev->periphid);
143amba_attr_func(irq0, "%u\n", dev->irq[0]);
144amba_attr_func(irq1, "%u\n", dev->irq[1]);
145amba_attr_func(resource, "\t%016llx\t%016llx\t%016lx\n",
146 (unsigned long long)dev->res.start, (unsigned long long)dev->res.end,
147 dev->res.flags);
148
149static struct attribute *amba_dev_attrs[] = {
150 &dev_attr_id.attr,
151 &dev_attr_resource.attr,
152 &dev_attr_driver_override.attr,
153 NULL,
154};
155ATTRIBUTE_GROUPS(amba_dev);
156
157#ifdef CONFIG_PM
158/*
159 * Hooks to provide runtime PM of the pclk (bus clock). It is safe to
160 * enable/disable the bus clock at runtime PM suspend/resume as this
161 * does not result in loss of context.
162 */
163static int amba_pm_runtime_suspend(struct device *dev)
164{
165 struct amba_device *pcdev = to_amba_device(dev);
166 int ret = pm_generic_runtime_suspend(dev);
167
168 if (ret == 0 && dev->driver) {
169 if (pm_runtime_is_irq_safe(dev))
170 clk_disable(pcdev->pclk);
171 else
172 clk_disable_unprepare(pcdev->pclk);
173 }
174
175 return ret;
176}
177
178static int amba_pm_runtime_resume(struct device *dev)
179{
180 struct amba_device *pcdev = to_amba_device(dev);
181 int ret;
182
183 if (dev->driver) {
184 if (pm_runtime_is_irq_safe(dev))
185 ret = clk_enable(pcdev->pclk);
186 else
187 ret = clk_prepare_enable(pcdev->pclk);
188 /* Failure is probably fatal to the system, but... */
189 if (ret)
190 return ret;
191 }
192
193 return pm_generic_runtime_resume(dev);
194}
195#endif /* CONFIG_PM */
196
197static const struct dev_pm_ops amba_pm = {
198 .suspend = pm_generic_suspend,
199 .resume = pm_generic_resume,
200 .freeze = pm_generic_freeze,
201 .thaw = pm_generic_thaw,
202 .poweroff = pm_generic_poweroff,
203 .restore = pm_generic_restore,
204 SET_RUNTIME_PM_OPS(
205 amba_pm_runtime_suspend,
206 amba_pm_runtime_resume,
207 NULL
208 )
209};
210
211/*
212 * Primecells are part of the Advanced Microcontroller Bus Architecture,
213 * so we call the bus "amba".
214 * DMA configuration for platform and AMBA bus is same. So here we reuse
215 * platform's DMA config routine.
216 */
217struct bus_type amba_bustype = {
218 .name = "amba",
219 .dev_groups = amba_dev_groups,
220 .match = amba_match,
221 .uevent = amba_uevent,
222 .dma_configure = platform_dma_configure,
223 .pm = &amba_pm,
224};
225EXPORT_SYMBOL_GPL(amba_bustype);
226
227static int __init amba_init(void)
228{
229 return bus_register(&amba_bustype);
230}
231
232postcore_initcall(amba_init);
233
234static int amba_get_enable_pclk(struct amba_device *pcdev)
235{
236 int ret;
237
238 pcdev->pclk = clk_get(&pcdev->dev, "apb_pclk");
239 if (IS_ERR(pcdev->pclk))
240 return PTR_ERR(pcdev->pclk);
241
242 ret = clk_prepare_enable(pcdev->pclk);
243 if (ret)
244 clk_put(pcdev->pclk);
245
246 return ret;
247}
248
249static void amba_put_disable_pclk(struct amba_device *pcdev)
250{
251 clk_disable_unprepare(pcdev->pclk);
252 clk_put(pcdev->pclk);
253}
254
255/*
256 * These are the device model conversion veneers; they convert the
257 * device model structures to our more specific structures.
258 */
259static int amba_probe(struct device *dev)
260{
261 struct amba_device *pcdev = to_amba_device(dev);
262 struct amba_driver *pcdrv = to_amba_driver(dev->driver);
263 const struct amba_id *id = amba_lookup(pcdrv->id_table, pcdev);
264 int ret;
265
266 do {
267 ret = of_clk_set_defaults(dev->of_node, false);
268 if (ret < 0)
269 break;
270
271 ret = dev_pm_domain_attach(dev, true);
272 if (ret)
273 break;
274
275 ret = amba_get_enable_pclk(pcdev);
276 if (ret) {
277 dev_pm_domain_detach(dev, true);
278 break;
279 }
280
281 pm_runtime_get_noresume(dev);
282 pm_runtime_set_active(dev);
283 pm_runtime_enable(dev);
284
285 ret = pcdrv->probe(pcdev, id);
286 if (ret == 0)
287 break;
288
289 pm_runtime_disable(dev);
290 pm_runtime_set_suspended(dev);
291 pm_runtime_put_noidle(dev);
292
293 amba_put_disable_pclk(pcdev);
294 dev_pm_domain_detach(dev, true);
295 } while (0);
296
297 return ret;
298}
299
300static int amba_remove(struct device *dev)
301{
302 struct amba_device *pcdev = to_amba_device(dev);
303 struct amba_driver *drv = to_amba_driver(dev->driver);
304 int ret;
305
306 pm_runtime_get_sync(dev);
307 ret = drv->remove(pcdev);
308 pm_runtime_put_noidle(dev);
309
310 /* Undo the runtime PM settings in amba_probe() */
311 pm_runtime_disable(dev);
312 pm_runtime_set_suspended(dev);
313 pm_runtime_put_noidle(dev);
314
315 amba_put_disable_pclk(pcdev);
316 dev_pm_domain_detach(dev, true);
317
318 return ret;
319}
320
321static void amba_shutdown(struct device *dev)
322{
323 struct amba_driver *drv = to_amba_driver(dev->driver);
324 drv->shutdown(to_amba_device(dev));
325}
326
327/**
328 * amba_driver_register - register an AMBA device driver
329 * @drv: amba device driver structure
330 *
331 * Register an AMBA device driver with the Linux device model
332 * core. If devices pre-exist, the drivers probe function will
333 * be called.
334 */
335int amba_driver_register(struct amba_driver *drv)
336{
337 drv->drv.bus = &amba_bustype;
338
339#define SETFN(fn) if (drv->fn) drv->drv.fn = amba_##fn
340 SETFN(probe);
341 SETFN(remove);
342 SETFN(shutdown);
343
344 return driver_register(&drv->drv);
345}
346
347/**
348 * amba_driver_unregister - remove an AMBA device driver
349 * @drv: AMBA device driver structure to remove
350 *
351 * Unregister an AMBA device driver from the Linux device
352 * model. The device model will call the drivers remove function
353 * for each device the device driver is currently handling.
354 */
355void amba_driver_unregister(struct amba_driver *drv)
356{
357 driver_unregister(&drv->drv);
358}
359
360
361static void amba_device_release(struct device *dev)
362{
363 struct amba_device *d = to_amba_device(dev);
364
365 if (d->res.parent)
366 release_resource(&d->res);
367 kfree(d);
368}
369
370static int amba_device_try_add(struct amba_device *dev, struct resource *parent)
371{
372 u32 size;
373 void __iomem *tmp;
374 int i, ret;
375
376 WARN_ON(dev->irq[0] == (unsigned int)-1);
377 WARN_ON(dev->irq[1] == (unsigned int)-1);
378
379 ret = request_resource(parent, &dev->res);
380 if (ret)
381 goto err_out;
382
383 /* Hard-coded primecell ID instead of plug-n-play */
384 if (dev->periphid != 0)
385 goto skip_probe;
386
387 /*
388 * Dynamically calculate the size of the resource
389 * and use this for iomap
390 */
391 size = resource_size(&dev->res);
392 tmp = ioremap(dev->res.start, size);
393 if (!tmp) {
394 ret = -ENOMEM;
395 goto err_release;
396 }
397
398 ret = dev_pm_domain_attach(&dev->dev, true);
399 if (ret) {
400 iounmap(tmp);
401 goto err_release;
402 }
403
404 ret = amba_get_enable_pclk(dev);
405 if (ret == 0) {
406 u32 pid, cid;
407
408 /*
409 * Read pid and cid based on size of resource
410 * they are located at end of region
411 */
412 for (pid = 0, i = 0; i < 4; i++)
413 pid |= (readl(tmp + size - 0x20 + 4 * i) & 255) <<
414 (i * 8);
415 for (cid = 0, i = 0; i < 4; i++)
416 cid |= (readl(tmp + size - 0x10 + 4 * i) & 255) <<
417 (i * 8);
418
419 if (cid == CORESIGHT_CID) {
420 /* set the base to the start of the last 4k block */
421 void __iomem *csbase = tmp + size - 4096;
422
423 dev->uci.devarch =
424 readl(csbase + UCI_REG_DEVARCH_OFFSET);
425 dev->uci.devtype =
426 readl(csbase + UCI_REG_DEVTYPE_OFFSET) & 0xff;
427 }
428
429 amba_put_disable_pclk(dev);
430
431 if (cid == AMBA_CID || cid == CORESIGHT_CID) {
432 dev->periphid = pid;
433 dev->cid = cid;
434 }
435
436 if (!dev->periphid)
437 ret = -ENODEV;
438 }
439
440 iounmap(tmp);
441 dev_pm_domain_detach(&dev->dev, true);
442
443 if (ret)
444 goto err_release;
445
446 skip_probe:
447 ret = device_add(&dev->dev);
448 if (ret)
449 goto err_release;
450
451 if (dev->irq[0])
452 ret = device_create_file(&dev->dev, &dev_attr_irq0);
453 if (ret == 0 && dev->irq[1])
454 ret = device_create_file(&dev->dev, &dev_attr_irq1);
455 if (ret == 0)
456 return ret;
457
458 device_unregister(&dev->dev);
459
460 err_release:
461 release_resource(&dev->res);
462 err_out:
463 return ret;
464}
465
466/*
467 * Registration of AMBA device require reading its pid and cid registers.
468 * To do this, the device must be turned on (if it is a part of power domain)
469 * and have clocks enabled. However in some cases those resources might not be
470 * yet available. Returning EPROBE_DEFER is not a solution in such case,
471 * because callers don't handle this special error code. Instead such devices
472 * are added to the special list and their registration is retried from
473 * periodic worker, until all resources are available and registration succeeds.
474 */
475struct deferred_device {
476 struct amba_device *dev;
477 struct resource *parent;
478 struct list_head node;
479};
480
481static LIST_HEAD(deferred_devices);
482static DEFINE_MUTEX(deferred_devices_lock);
483
484static void amba_deferred_retry_func(struct work_struct *dummy);
485static DECLARE_DELAYED_WORK(deferred_retry_work, amba_deferred_retry_func);
486
487#define DEFERRED_DEVICE_TIMEOUT (msecs_to_jiffies(5 * 1000))
488
489static void amba_deferred_retry_func(struct work_struct *dummy)
490{
491 struct deferred_device *ddev, *tmp;
492
493 mutex_lock(&deferred_devices_lock);
494
495 list_for_each_entry_safe(ddev, tmp, &deferred_devices, node) {
496 int ret = amba_device_try_add(ddev->dev, ddev->parent);
497
498 if (ret == -EPROBE_DEFER)
499 continue;
500
501 list_del_init(&ddev->node);
502 kfree(ddev);
503 }
504
505 if (!list_empty(&deferred_devices))
506 schedule_delayed_work(&deferred_retry_work,
507 DEFERRED_DEVICE_TIMEOUT);
508
509 mutex_unlock(&deferred_devices_lock);
510}
511
512/**
513 * amba_device_add - add a previously allocated AMBA device structure
514 * @dev: AMBA device allocated by amba_device_alloc
515 * @parent: resource parent for this devices resources
516 *
517 * Claim the resource, and read the device cell ID if not already
518 * initialized. Register the AMBA device with the Linux device
519 * manager.
520 */
521int amba_device_add(struct amba_device *dev, struct resource *parent)
522{
523 int ret = amba_device_try_add(dev, parent);
524
525 if (ret == -EPROBE_DEFER) {
526 struct deferred_device *ddev;
527
528 ddev = kmalloc(sizeof(*ddev), GFP_KERNEL);
529 if (!ddev)
530 return -ENOMEM;
531
532 ddev->dev = dev;
533 ddev->parent = parent;
534 ret = 0;
535
536 mutex_lock(&deferred_devices_lock);
537
538 if (list_empty(&deferred_devices))
539 schedule_delayed_work(&deferred_retry_work,
540 DEFERRED_DEVICE_TIMEOUT);
541 list_add_tail(&ddev->node, &deferred_devices);
542
543 mutex_unlock(&deferred_devices_lock);
544 }
545 return ret;
546}
547EXPORT_SYMBOL_GPL(amba_device_add);
548
549static struct amba_device *
550amba_aphb_device_add(struct device *parent, const char *name,
551 resource_size_t base, size_t size, int irq1, int irq2,
552 void *pdata, unsigned int periphid, u64 dma_mask,
553 struct resource *resbase)
554{
555 struct amba_device *dev;
556 int ret;
557
558 dev = amba_device_alloc(name, base, size);
559 if (!dev)
560 return ERR_PTR(-ENOMEM);
561
562 dev->dev.coherent_dma_mask = dma_mask;
563 dev->irq[0] = irq1;
564 dev->irq[1] = irq2;
565 dev->periphid = periphid;
566 dev->dev.platform_data = pdata;
567 dev->dev.parent = parent;
568
569 ret = amba_device_add(dev, resbase);
570 if (ret) {
571 amba_device_put(dev);
572 return ERR_PTR(ret);
573 }
574
575 return dev;
576}
577
578struct amba_device *
579amba_apb_device_add(struct device *parent, const char *name,
580 resource_size_t base, size_t size, int irq1, int irq2,
581 void *pdata, unsigned int periphid)
582{
583 return amba_aphb_device_add(parent, name, base, size, irq1, irq2, pdata,
584 periphid, 0, &iomem_resource);
585}
586EXPORT_SYMBOL_GPL(amba_apb_device_add);
587
588struct amba_device *
589amba_ahb_device_add(struct device *parent, const char *name,
590 resource_size_t base, size_t size, int irq1, int irq2,
591 void *pdata, unsigned int periphid)
592{
593 return amba_aphb_device_add(parent, name, base, size, irq1, irq2, pdata,
594 periphid, ~0ULL, &iomem_resource);
595}
596EXPORT_SYMBOL_GPL(amba_ahb_device_add);
597
598struct amba_device *
599amba_apb_device_add_res(struct device *parent, const char *name,
600 resource_size_t base, size_t size, int irq1,
601 int irq2, void *pdata, unsigned int periphid,
602 struct resource *resbase)
603{
604 return amba_aphb_device_add(parent, name, base, size, irq1, irq2, pdata,
605 periphid, 0, resbase);
606}
607EXPORT_SYMBOL_GPL(amba_apb_device_add_res);
608
609struct amba_device *
610amba_ahb_device_add_res(struct device *parent, const char *name,
611 resource_size_t base, size_t size, int irq1,
612 int irq2, void *pdata, unsigned int periphid,
613 struct resource *resbase)
614{
615 return amba_aphb_device_add(parent, name, base, size, irq1, irq2, pdata,
616 periphid, ~0ULL, resbase);
617}
618EXPORT_SYMBOL_GPL(amba_ahb_device_add_res);
619
620
621static void amba_device_initialize(struct amba_device *dev, const char *name)
622{
623 device_initialize(&dev->dev);
624 if (name)
625 dev_set_name(&dev->dev, "%s", name);
626 dev->dev.release = amba_device_release;
627 dev->dev.bus = &amba_bustype;
628 dev->dev.dma_mask = &dev->dev.coherent_dma_mask;
629 dev->res.name = dev_name(&dev->dev);
630}
631
632/**
633 * amba_device_alloc - allocate an AMBA device
634 * @name: sysfs name of the AMBA device
635 * @base: base of AMBA device
636 * @size: size of AMBA device
637 *
638 * Allocate and initialize an AMBA device structure. Returns %NULL
639 * on failure.
640 */
641struct amba_device *amba_device_alloc(const char *name, resource_size_t base,
642 size_t size)
643{
644 struct amba_device *dev;
645
646 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
647 if (dev) {
648 amba_device_initialize(dev, name);
649 dev->res.start = base;
650 dev->res.end = base + size - 1;
651 dev->res.flags = IORESOURCE_MEM;
652 }
653
654 return dev;
655}
656EXPORT_SYMBOL_GPL(amba_device_alloc);
657
658/**
659 * amba_device_register - register an AMBA device
660 * @dev: AMBA device to register
661 * @parent: parent memory resource
662 *
663 * Setup the AMBA device, reading the cell ID if present.
664 * Claim the resource, and register the AMBA device with
665 * the Linux device manager.
666 */
667int amba_device_register(struct amba_device *dev, struct resource *parent)
668{
669 amba_device_initialize(dev, dev->dev.init_name);
670 dev->dev.init_name = NULL;
671
672 return amba_device_add(dev, parent);
673}
674
675/**
676 * amba_device_put - put an AMBA device
677 * @dev: AMBA device to put
678 */
679void amba_device_put(struct amba_device *dev)
680{
681 put_device(&dev->dev);
682}
683EXPORT_SYMBOL_GPL(amba_device_put);
684
685/**
686 * amba_device_unregister - unregister an AMBA device
687 * @dev: AMBA device to remove
688 *
689 * Remove the specified AMBA device from the Linux device
690 * manager. All files associated with this object will be
691 * destroyed, and device drivers notified that the device has
692 * been removed. The AMBA device's resources including
693 * the amba_device structure will be freed once all
694 * references to it have been dropped.
695 */
696void amba_device_unregister(struct amba_device *dev)
697{
698 device_unregister(&dev->dev);
699}
700
701
702struct find_data {
703 struct amba_device *dev;
704 struct device *parent;
705 const char *busid;
706 unsigned int id;
707 unsigned int mask;
708};
709
710static int amba_find_match(struct device *dev, void *data)
711{
712 struct find_data *d = data;
713 struct amba_device *pcdev = to_amba_device(dev);
714 int r;
715
716 r = (pcdev->periphid & d->mask) == d->id;
717 if (d->parent)
718 r &= d->parent == dev->parent;
719 if (d->busid)
720 r &= strcmp(dev_name(dev), d->busid) == 0;
721
722 if (r) {
723 get_device(dev);
724 d->dev = pcdev;
725 }
726
727 return r;
728}
729
730/**
731 * amba_find_device - locate an AMBA device given a bus id
732 * @busid: bus id for device (or NULL)
733 * @parent: parent device (or NULL)
734 * @id: peripheral ID (or 0)
735 * @mask: peripheral ID mask (or 0)
736 *
737 * Return the AMBA device corresponding to the supplied parameters.
738 * If no device matches, returns NULL.
739 *
740 * NOTE: When a valid device is found, its refcount is
741 * incremented, and must be decremented before the returned
742 * reference.
743 */
744struct amba_device *
745amba_find_device(const char *busid, struct device *parent, unsigned int id,
746 unsigned int mask)
747{
748 struct find_data data;
749
750 data.dev = NULL;
751 data.parent = parent;
752 data.busid = busid;
753 data.id = id;
754 data.mask = mask;
755
756 bus_for_each_dev(&amba_bustype, NULL, &data, amba_find_match);
757
758 return data.dev;
759}
760
761/**
762 * amba_request_regions - request all mem regions associated with device
763 * @dev: amba_device structure for device
764 * @name: name, or NULL to use driver name
765 */
766int amba_request_regions(struct amba_device *dev, const char *name)
767{
768 int ret = 0;
769 u32 size;
770
771 if (!name)
772 name = dev->dev.driver->name;
773
774 size = resource_size(&dev->res);
775
776 if (!request_mem_region(dev->res.start, size, name))
777 ret = -EBUSY;
778
779 return ret;
780}
781
782/**
783 * amba_release_regions - release mem regions associated with device
784 * @dev: amba_device structure for device
785 *
786 * Release regions claimed by a successful call to amba_request_regions.
787 */
788void amba_release_regions(struct amba_device *dev)
789{
790 u32 size;
791
792 size = resource_size(&dev->res);
793 release_mem_region(dev->res.start, size);
794}
795
796EXPORT_SYMBOL(amba_driver_register);
797EXPORT_SYMBOL(amba_driver_unregister);
798EXPORT_SYMBOL(amba_device_register);
799EXPORT_SYMBOL(amba_device_unregister);
800EXPORT_SYMBOL(amba_find_device);
801EXPORT_SYMBOL(amba_request_regions);
802EXPORT_SYMBOL(amba_release_regions);
803

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