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Commit | Line | Data |
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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1da177e4 LT |
2 | /* |
3 | * linux/arch/arm/common/amba.c | |
4 | * | |
5 | * Copyright (C) 2003 Deep Blue Solutions Ltd, All Rights Reserved. | |
1da177e4 LT |
6 | */ |
7 | #include <linux/module.h> | |
8 | #include <linux/init.h> | |
9 | #include <linux/device.h> | |
4e57b681 TS |
10 | #include <linux/string.h> |
11 | #include <linux/slab.h> | |
934848da | 12 | #include <linux/io.h> |
ba74ec7f RV |
13 | #include <linux/pm.h> |
14 | #include <linux/pm_runtime.h> | |
f48c767c | 15 | #include <linux/pm_domain.h> |
a62c80e5 | 16 | #include <linux/amba/bus.h> |
a875cfbb | 17 | #include <linux/sizes.h> |
3cf38571 | 18 | #include <linux/limits.h> |
bcd3006f | 19 | #include <linux/clk/clk-conf.h> |
07397df2 | 20 | #include <linux/platform_device.h> |
79bdcb20 | 21 | #include <linux/reset.h> |
1da177e4 | 22 | |
934848da | 23 | #include <asm/irq.h> |
1da177e4 | 24 | |
1da177e4 LT |
25 | #define to_amba_driver(d) container_of(d, struct amba_driver, drv) |
26 | ||
4a2910fa ML |
27 | /* called on periphid match and class 0x9 coresight device. */ |
28 | static int | |
29 | amba_cs_uci_id_match(const struct amba_id *table, struct amba_device *dev) | |
1da177e4 LT |
30 | { |
31 | int ret = 0; | |
4a2910fa ML |
32 | struct amba_cs_uci_id *uci; |
33 | ||
34 | uci = table->data; | |
1da177e4 | 35 | |
4a2910fa ML |
36 | /* no table data or zero mask - return match on periphid */ |
37 | if (!uci || (uci->devarch_mask == 0)) | |
38 | return 1; | |
39 | ||
40 | /* test against read devtype and masked devarch value */ | |
41 | ret = (dev->uci.devtype == uci->devtype) && | |
42 | ((dev->uci.devarch & uci->devarch_mask) == uci->devarch); | |
43 | return ret; | |
44 | } | |
45 | ||
46 | static const struct amba_id * | |
47 | amba_lookup(const struct amba_id *table, struct amba_device *dev) | |
48 | { | |
1da177e4 | 49 | while (table->mask) { |
4a2910fa ML |
50 | if (((dev->periphid & table->mask) == table->id) && |
51 | ((dev->cid != CORESIGHT_CID) || | |
52 | (amba_cs_uci_id_match(table, dev)))) | |
53 | return table; | |
1da177e4 LT |
54 | table++; |
55 | } | |
4a2910fa | 56 | return NULL; |
1da177e4 LT |
57 | } |
58 | ||
5150a8f0 | 59 | static int amba_get_enable_pclk(struct amba_device *pcdev) |
1da177e4 | 60 | { |
5150a8f0 | 61 | int ret; |
1da177e4 | 62 | |
5150a8f0 UKK |
63 | pcdev->pclk = clk_get(&pcdev->dev, "apb_pclk"); |
64 | if (IS_ERR(pcdev->pclk)) | |
65 | return PTR_ERR(pcdev->pclk); | |
3cf38571 | 66 | |
5150a8f0 UKK |
67 | ret = clk_prepare_enable(pcdev->pclk); |
68 | if (ret) | |
69 | clk_put(pcdev->pclk); | |
70 | ||
71 | return ret; | |
1da177e4 LT |
72 | } |
73 | ||
5150a8f0 | 74 | static void amba_put_disable_pclk(struct amba_device *pcdev) |
1da177e4 | 75 | { |
5150a8f0 UKK |
76 | clk_disable_unprepare(pcdev->pclk); |
77 | clk_put(pcdev->pclk); | |
1da177e4 | 78 | } |
1da177e4 | 79 | |
5150a8f0 | 80 | |
3cf38571 AM |
81 | static ssize_t driver_override_show(struct device *_dev, |
82 | struct device_attribute *attr, char *buf) | |
83 | { | |
84 | struct amba_device *dev = to_amba_device(_dev); | |
6a7228d9 | 85 | ssize_t len; |
3cf38571 | 86 | |
6a7228d9 GU |
87 | device_lock(_dev); |
88 | len = sprintf(buf, "%s\n", dev->driver_override); | |
89 | device_unlock(_dev); | |
90 | return len; | |
3cf38571 AM |
91 | } |
92 | ||
93 | static ssize_t driver_override_store(struct device *_dev, | |
94 | struct device_attribute *attr, | |
95 | const char *buf, size_t count) | |
96 | { | |
97 | struct amba_device *dev = to_amba_device(_dev); | |
6a7228d9 | 98 | char *driver_override, *old, *cp; |
3cf38571 | 99 | |
d2ffed51 GU |
100 | /* We need to keep extra room for a newline */ |
101 | if (count >= (PAGE_SIZE - 1)) | |
3cf38571 AM |
102 | return -EINVAL; |
103 | ||
104 | driver_override = kstrndup(buf, count, GFP_KERNEL); | |
105 | if (!driver_override) | |
106 | return -ENOMEM; | |
107 | ||
108 | cp = strchr(driver_override, '\n'); | |
109 | if (cp) | |
110 | *cp = '\0'; | |
111 | ||
6a7228d9 GU |
112 | device_lock(_dev); |
113 | old = dev->driver_override; | |
3cf38571 AM |
114 | if (strlen(driver_override)) { |
115 | dev->driver_override = driver_override; | |
116 | } else { | |
6be5b5b9 GU |
117 | kfree(driver_override); |
118 | dev->driver_override = NULL; | |
3cf38571 | 119 | } |
6a7228d9 | 120 | device_unlock(_dev); |
3cf38571 AM |
121 | |
122 | kfree(old); | |
123 | ||
124 | return count; | |
125 | } | |
966449a3 | 126 | static DEVICE_ATTR_RW(driver_override); |
3cf38571 | 127 | |
96b13f5c RK |
128 | #define amba_attr_func(name,fmt,arg...) \ |
129 | static ssize_t name##_show(struct device *_dev, \ | |
130 | struct device_attribute *attr, char *buf) \ | |
131 | { \ | |
132 | struct amba_device *dev = to_amba_device(_dev); \ | |
133 | return sprintf(buf, fmt, arg); \ | |
966449a3 GKH |
134 | } \ |
135 | static DEVICE_ATTR_RO(name) | |
96b13f5c RK |
136 | |
137 | amba_attr_func(id, "%08x\n", dev->periphid); | |
966449a3 GKH |
138 | amba_attr_func(irq0, "%u\n", dev->irq[0]); |
139 | amba_attr_func(irq1, "%u\n", dev->irq[1]); | |
96b13f5c RK |
140 | amba_attr_func(resource, "\t%016llx\t%016llx\t%016lx\n", |
141 | (unsigned long long)dev->res.start, (unsigned long long)dev->res.end, | |
142 | dev->res.flags); | |
143 | ||
966449a3 GKH |
144 | static struct attribute *amba_dev_attrs[] = { |
145 | &dev_attr_id.attr, | |
146 | &dev_attr_resource.attr, | |
147 | &dev_attr_driver_override.attr, | |
148 | NULL, | |
96b13f5c | 149 | }; |
966449a3 | 150 | ATTRIBUTE_GROUPS(amba_dev); |
96b13f5c | 151 | |
5150a8f0 UKK |
152 | static int amba_match(struct device *dev, struct device_driver *drv) |
153 | { | |
154 | struct amba_device *pcdev = to_amba_device(dev); | |
155 | struct amba_driver *pcdrv = to_amba_driver(drv); | |
156 | ||
157 | /* When driver_override is set, only bind to the matching driver */ | |
158 | if (pcdev->driver_override) | |
159 | return !strcmp(pcdev->driver_override, drv->name); | |
160 | ||
161 | return amba_lookup(pcdrv->id_table, pcdev) != NULL; | |
162 | } | |
163 | ||
164 | static int amba_uevent(struct device *dev, struct kobj_uevent_env *env) | |
165 | { | |
166 | struct amba_device *pcdev = to_amba_device(dev); | |
167 | int retval = 0; | |
168 | ||
169 | retval = add_uevent_var(env, "AMBA_ID=%08x", pcdev->periphid); | |
170 | if (retval) | |
171 | return retval; | |
172 | ||
173 | retval = add_uevent_var(env, "MODALIAS=amba:d%08X", pcdev->periphid); | |
174 | return retval; | |
175 | } | |
176 | ||
f170b59f UKK |
177 | /* |
178 | * These are the device model conversion veneers; they convert the | |
179 | * device model structures to our more specific structures. | |
180 | */ | |
181 | static int amba_probe(struct device *dev) | |
182 | { | |
183 | struct amba_device *pcdev = to_amba_device(dev); | |
184 | struct amba_driver *pcdrv = to_amba_driver(dev->driver); | |
185 | const struct amba_id *id = amba_lookup(pcdrv->id_table, pcdev); | |
186 | int ret; | |
187 | ||
188 | do { | |
189 | ret = of_clk_set_defaults(dev->of_node, false); | |
190 | if (ret < 0) | |
191 | break; | |
192 | ||
193 | ret = dev_pm_domain_attach(dev, true); | |
194 | if (ret) | |
195 | break; | |
196 | ||
197 | ret = amba_get_enable_pclk(pcdev); | |
198 | if (ret) { | |
199 | dev_pm_domain_detach(dev, true); | |
200 | break; | |
201 | } | |
202 | ||
203 | pm_runtime_get_noresume(dev); | |
204 | pm_runtime_set_active(dev); | |
205 | pm_runtime_enable(dev); | |
206 | ||
207 | ret = pcdrv->probe(pcdev, id); | |
208 | if (ret == 0) | |
209 | break; | |
210 | ||
211 | pm_runtime_disable(dev); | |
212 | pm_runtime_set_suspended(dev); | |
213 | pm_runtime_put_noidle(dev); | |
214 | ||
215 | amba_put_disable_pclk(pcdev); | |
216 | dev_pm_domain_detach(dev, true); | |
217 | } while (0); | |
218 | ||
219 | return ret; | |
220 | } | |
221 | ||
222 | static int amba_remove(struct device *dev) | |
223 | { | |
224 | struct amba_device *pcdev = to_amba_device(dev); | |
225 | struct amba_driver *drv = to_amba_driver(dev->driver); | |
226 | ||
227 | pm_runtime_get_sync(dev); | |
228 | if (drv->remove) | |
229 | drv->remove(pcdev); | |
230 | pm_runtime_put_noidle(dev); | |
231 | ||
232 | /* Undo the runtime PM settings in amba_probe() */ | |
233 | pm_runtime_disable(dev); | |
234 | pm_runtime_set_suspended(dev); | |
235 | pm_runtime_put_noidle(dev); | |
236 | ||
237 | amba_put_disable_pclk(pcdev); | |
238 | dev_pm_domain_detach(dev, true); | |
239 | ||
240 | return 0; | |
241 | } | |
242 | ||
243 | static void amba_shutdown(struct device *dev) | |
244 | { | |
245 | struct amba_driver *drv; | |
246 | ||
247 | if (!dev->driver) | |
248 | return; | |
249 | ||
250 | drv = to_amba_driver(dev->driver); | |
251 | if (drv->shutdown) | |
252 | drv->shutdown(to_amba_device(dev)); | |
253 | } | |
254 | ||
f210c53a | 255 | #ifdef CONFIG_PM |
92b97f0a RK |
256 | /* |
257 | * Hooks to provide runtime PM of the pclk (bus clock). It is safe to | |
258 | * enable/disable the bus clock at runtime PM suspend/resume as this | |
1e45860f | 259 | * does not result in loss of context. |
92b97f0a RK |
260 | */ |
261 | static int amba_pm_runtime_suspend(struct device *dev) | |
262 | { | |
263 | struct amba_device *pcdev = to_amba_device(dev); | |
264 | int ret = pm_generic_runtime_suspend(dev); | |
265 | ||
5670c2a5 KK |
266 | if (ret == 0 && dev->driver) { |
267 | if (pm_runtime_is_irq_safe(dev)) | |
268 | clk_disable(pcdev->pclk); | |
269 | else | |
270 | clk_disable_unprepare(pcdev->pclk); | |
271 | } | |
92b97f0a RK |
272 | |
273 | return ret; | |
274 | } | |
275 | ||
276 | static int amba_pm_runtime_resume(struct device *dev) | |
277 | { | |
278 | struct amba_device *pcdev = to_amba_device(dev); | |
279 | int ret; | |
280 | ||
281 | if (dev->driver) { | |
5670c2a5 KK |
282 | if (pm_runtime_is_irq_safe(dev)) |
283 | ret = clk_enable(pcdev->pclk); | |
284 | else | |
285 | ret = clk_prepare_enable(pcdev->pclk); | |
92b97f0a RK |
286 | /* Failure is probably fatal to the system, but... */ |
287 | if (ret) | |
288 | return ret; | |
289 | } | |
290 | ||
291 | return pm_generic_runtime_resume(dev); | |
292 | } | |
5670c2a5 | 293 | #endif /* CONFIG_PM */ |
92b97f0a | 294 | |
ba74ec7f | 295 | static const struct dev_pm_ops amba_pm = { |
26825cfd UH |
296 | .suspend = pm_generic_suspend, |
297 | .resume = pm_generic_resume, | |
298 | .freeze = pm_generic_freeze, | |
299 | .thaw = pm_generic_thaw, | |
300 | .poweroff = pm_generic_poweroff, | |
301 | .restore = pm_generic_restore, | |
6ed23b80 | 302 | SET_RUNTIME_PM_OPS( |
92b97f0a RK |
303 | amba_pm_runtime_suspend, |
304 | amba_pm_runtime_resume, | |
45f0a85c | 305 | NULL |
ba74ec7f RV |
306 | ) |
307 | }; | |
308 | ||
1da177e4 LT |
309 | /* |
310 | * Primecells are part of the Advanced Microcontroller Bus Architecture, | |
311 | * so we call the bus "amba". | |
07397df2 NG |
312 | * DMA configuration for platform and AMBA bus is same. So here we reuse |
313 | * platform's DMA config routine. | |
1da177e4 | 314 | */ |
394d5aef | 315 | struct bus_type amba_bustype = { |
1da177e4 | 316 | .name = "amba", |
966449a3 | 317 | .dev_groups = amba_dev_groups, |
1da177e4 | 318 | .match = amba_match, |
6d20b035 | 319 | .uevent = amba_uevent, |
f170b59f UKK |
320 | .probe = amba_probe, |
321 | .remove = amba_remove, | |
322 | .shutdown = amba_shutdown, | |
07397df2 | 323 | .dma_configure = platform_dma_configure, |
26825cfd | 324 | .pm = &amba_pm, |
1da177e4 | 325 | }; |
e9ac68c3 | 326 | EXPORT_SYMBOL_GPL(amba_bustype); |
1da177e4 LT |
327 | |
328 | static int __init amba_init(void) | |
329 | { | |
330 | return bus_register(&amba_bustype); | |
331 | } | |
332 | ||
333 | postcore_initcall(amba_init); | |
334 | ||
1da177e4 LT |
335 | /** |
336 | * amba_driver_register - register an AMBA device driver | |
337 | * @drv: amba device driver structure | |
338 | * | |
339 | * Register an AMBA device driver with the Linux device model | |
340 | * core. If devices pre-exist, the drivers probe function will | |
341 | * be called. | |
342 | */ | |
343 | int amba_driver_register(struct amba_driver *drv) | |
344 | { | |
de5d7adb UKK |
345 | if (!drv->probe) |
346 | return -EINVAL; | |
1da177e4 | 347 | |
de5d7adb | 348 | drv->drv.bus = &amba_bustype; |
1da177e4 LT |
349 | |
350 | return driver_register(&drv->drv); | |
351 | } | |
352 | ||
353 | /** | |
354 | * amba_driver_unregister - remove an AMBA device driver | |
355 | * @drv: AMBA device driver structure to remove | |
356 | * | |
357 | * Unregister an AMBA device driver from the Linux device | |
358 | * model. The device model will call the drivers remove function | |
359 | * for each device the device driver is currently handling. | |
360 | */ | |
361 | void amba_driver_unregister(struct amba_driver *drv) | |
362 | { | |
363 | driver_unregister(&drv->drv); | |
364 | } | |
365 | ||
366 | ||
367 | static void amba_device_release(struct device *dev) | |
368 | { | |
369 | struct amba_device *d = to_amba_device(dev); | |
370 | ||
371 | if (d->res.parent) | |
372 | release_resource(&d->res); | |
373 | kfree(d); | |
374 | } | |
375 | ||
a41980f2 | 376 | static int amba_device_try_add(struct amba_device *dev, struct resource *parent) |
1da177e4 | 377 | { |
8afe0b96 | 378 | u32 size; |
1da177e4 LT |
379 | void __iomem *tmp; |
380 | int i, ret; | |
381 | ||
2eac58d5 RK |
382 | WARN_ON(dev->irq[0] == (unsigned int)-1); |
383 | WARN_ON(dev->irq[1] == (unsigned int)-1); | |
384 | ||
1da177e4 | 385 | ret = request_resource(parent, &dev->res); |
96b13f5c RK |
386 | if (ret) |
387 | goto err_out; | |
388 | ||
97ceed1f LW |
389 | /* Hard-coded primecell ID instead of plug-n-play */ |
390 | if (dev->periphid != 0) | |
391 | goto skip_probe; | |
392 | ||
8afe0b96 LC |
393 | /* |
394 | * Dynamically calculate the size of the resource | |
395 | * and use this for iomap | |
396 | */ | |
397 | size = resource_size(&dev->res); | |
398 | tmp = ioremap(dev->res.start, size); | |
96b13f5c RK |
399 | if (!tmp) { |
400 | ret = -ENOMEM; | |
401 | goto err_release; | |
1da177e4 | 402 | } |
96b13f5c | 403 | |
a41980f2 | 404 | ret = dev_pm_domain_attach(&dev->dev, true); |
d21bc89e | 405 | if (ret) { |
a41980f2 MS |
406 | iounmap(tmp); |
407 | goto err_release; | |
408 | } | |
409 | ||
7cfe2494 RK |
410 | ret = amba_get_enable_pclk(dev); |
411 | if (ret == 0) { | |
412 | u32 pid, cid; | |
79bdcb20 DN |
413 | struct reset_control *rstc; |
414 | ||
415 | /* | |
416 | * Find reset control(s) of the amba bus and de-assert them. | |
417 | */ | |
418 | rstc = of_reset_control_array_get_optional_shared(dev->dev.of_node); | |
419 | if (IS_ERR(rstc)) { | |
e963408e RK |
420 | ret = PTR_ERR(rstc); |
421 | if (ret != -EPROBE_DEFER) | |
422 | dev_err(&dev->dev, "can't get reset: %d\n", | |
423 | ret); | |
424 | goto err_reset; | |
79bdcb20 DN |
425 | } |
426 | reset_control_deassert(rstc); | |
427 | reset_control_put(rstc); | |
96b13f5c | 428 | |
7cfe2494 RK |
429 | /* |
430 | * Read pid and cid based on size of resource | |
431 | * they are located at end of region | |
432 | */ | |
433 | for (pid = 0, i = 0; i < 4; i++) | |
434 | pid |= (readl(tmp + size - 0x20 + 4 * i) & 255) << | |
435 | (i * 8); | |
436 | for (cid = 0, i = 0; i < 4; i++) | |
437 | cid |= (readl(tmp + size - 0x10 + 4 * i) & 255) << | |
438 | (i * 8); | |
96b13f5c | 439 | |
4a2910fa ML |
440 | if (cid == CORESIGHT_CID) { |
441 | /* set the base to the start of the last 4k block */ | |
442 | void __iomem *csbase = tmp + size - 4096; | |
443 | ||
444 | dev->uci.devarch = | |
445 | readl(csbase + UCI_REG_DEVARCH_OFFSET); | |
446 | dev->uci.devtype = | |
447 | readl(csbase + UCI_REG_DEVTYPE_OFFSET) & 0xff; | |
448 | } | |
449 | ||
7cfe2494 | 450 | amba_put_disable_pclk(dev); |
96b13f5c | 451 | |
4a2910fa | 452 | if (cid == AMBA_CID || cid == CORESIGHT_CID) { |
7cfe2494 | 453 | dev->periphid = pid; |
4a2910fa ML |
454 | dev->cid = cid; |
455 | } | |
7cfe2494 RK |
456 | |
457 | if (!dev->periphid) | |
458 | ret = -ENODEV; | |
96b13f5c RK |
459 | } |
460 | ||
7cfe2494 | 461 | iounmap(tmp); |
a41980f2 | 462 | dev_pm_domain_detach(&dev->dev, true); |
7cfe2494 RK |
463 | |
464 | if (ret) | |
465 | goto err_release; | |
466 | ||
97ceed1f | 467 | skip_probe: |
557dca5f | 468 | ret = device_add(&dev->dev); |
96b13f5c RK |
469 | if (ret) |
470 | goto err_release; | |
471 | ||
dfb85185 | 472 | if (dev->irq[0]) |
96b13f5c | 473 | ret = device_create_file(&dev->dev, &dev_attr_irq0); |
dfb85185 | 474 | if (ret == 0 && dev->irq[1]) |
96b13f5c RK |
475 | ret = device_create_file(&dev->dev, &dev_attr_irq1); |
476 | if (ret == 0) | |
477 | return ret; | |
478 | ||
479 | device_unregister(&dev->dev); | |
480 | ||
481 | err_release: | |
482 | release_resource(&dev->res); | |
483 | err_out: | |
1da177e4 | 484 | return ret; |
e963408e RK |
485 | |
486 | err_reset: | |
487 | amba_put_disable_pclk(dev); | |
488 | iounmap(tmp); | |
489 | dev_pm_domain_detach(&dev->dev, true); | |
490 | goto err_release; | |
1da177e4 | 491 | } |
a41980f2 MS |
492 | |
493 | /* | |
494 | * Registration of AMBA device require reading its pid and cid registers. | |
495 | * To do this, the device must be turned on (if it is a part of power domain) | |
496 | * and have clocks enabled. However in some cases those resources might not be | |
497 | * yet available. Returning EPROBE_DEFER is not a solution in such case, | |
498 | * because callers don't handle this special error code. Instead such devices | |
499 | * are added to the special list and their registration is retried from | |
500 | * periodic worker, until all resources are available and registration succeeds. | |
501 | */ | |
502 | struct deferred_device { | |
503 | struct amba_device *dev; | |
504 | struct resource *parent; | |
505 | struct list_head node; | |
506 | }; | |
507 | ||
508 | static LIST_HEAD(deferred_devices); | |
509 | static DEFINE_MUTEX(deferred_devices_lock); | |
510 | ||
511 | static void amba_deferred_retry_func(struct work_struct *dummy); | |
512 | static DECLARE_DELAYED_WORK(deferred_retry_work, amba_deferred_retry_func); | |
513 | ||
514 | #define DEFERRED_DEVICE_TIMEOUT (msecs_to_jiffies(5 * 1000)) | |
515 | ||
039599c9 | 516 | static int amba_deferred_retry(void) |
a41980f2 MS |
517 | { |
518 | struct deferred_device *ddev, *tmp; | |
519 | ||
520 | mutex_lock(&deferred_devices_lock); | |
521 | ||
522 | list_for_each_entry_safe(ddev, tmp, &deferred_devices, node) { | |
523 | int ret = amba_device_try_add(ddev->dev, ddev->parent); | |
524 | ||
525 | if (ret == -EPROBE_DEFER) | |
526 | continue; | |
527 | ||
528 | list_del_init(&ddev->node); | |
529 | kfree(ddev); | |
530 | } | |
531 | ||
039599c9 RH |
532 | mutex_unlock(&deferred_devices_lock); |
533 | ||
534 | return 0; | |
535 | } | |
536 | late_initcall(amba_deferred_retry); | |
537 | ||
538 | static void amba_deferred_retry_func(struct work_struct *dummy) | |
539 | { | |
540 | amba_deferred_retry(); | |
541 | ||
a41980f2 MS |
542 | if (!list_empty(&deferred_devices)) |
543 | schedule_delayed_work(&deferred_retry_work, | |
544 | DEFERRED_DEVICE_TIMEOUT); | |
a41980f2 MS |
545 | } |
546 | ||
547 | /** | |
548 | * amba_device_add - add a previously allocated AMBA device structure | |
549 | * @dev: AMBA device allocated by amba_device_alloc | |
550 | * @parent: resource parent for this devices resources | |
551 | * | |
552 | * Claim the resource, and read the device cell ID if not already | |
553 | * initialized. Register the AMBA device with the Linux device | |
554 | * manager. | |
555 | */ | |
556 | int amba_device_add(struct amba_device *dev, struct resource *parent) | |
557 | { | |
558 | int ret = amba_device_try_add(dev, parent); | |
559 | ||
560 | if (ret == -EPROBE_DEFER) { | |
561 | struct deferred_device *ddev; | |
562 | ||
563 | ddev = kmalloc(sizeof(*ddev), GFP_KERNEL); | |
564 | if (!ddev) | |
565 | return -ENOMEM; | |
566 | ||
567 | ddev->dev = dev; | |
568 | ddev->parent = parent; | |
569 | ret = 0; | |
570 | ||
571 | mutex_lock(&deferred_devices_lock); | |
572 | ||
573 | if (list_empty(&deferred_devices)) | |
574 | schedule_delayed_work(&deferred_retry_work, | |
575 | DEFERRED_DEVICE_TIMEOUT); | |
576 | list_add_tail(&ddev->node, &deferred_devices); | |
577 | ||
578 | mutex_unlock(&deferred_devices_lock); | |
579 | } | |
580 | return ret; | |
581 | } | |
d5dc9271 RK |
582 | EXPORT_SYMBOL_GPL(amba_device_add); |
583 | ||
6026aa90 LW |
584 | static struct amba_device * |
585 | amba_aphb_device_add(struct device *parent, const char *name, | |
586 | resource_size_t base, size_t size, int irq1, int irq2, | |
3ad909bc LW |
587 | void *pdata, unsigned int periphid, u64 dma_mask, |
588 | struct resource *resbase) | |
6026aa90 LW |
589 | { |
590 | struct amba_device *dev; | |
591 | int ret; | |
592 | ||
593 | dev = amba_device_alloc(name, base, size); | |
594 | if (!dev) | |
595 | return ERR_PTR(-ENOMEM); | |
596 | ||
6026aa90 LW |
597 | dev->dev.coherent_dma_mask = dma_mask; |
598 | dev->irq[0] = irq1; | |
599 | dev->irq[1] = irq2; | |
600 | dev->periphid = periphid; | |
601 | dev->dev.platform_data = pdata; | |
602 | dev->dev.parent = parent; | |
603 | ||
3ad909bc | 604 | ret = amba_device_add(dev, resbase); |
6026aa90 LW |
605 | if (ret) { |
606 | amba_device_put(dev); | |
607 | return ERR_PTR(ret); | |
608 | } | |
609 | ||
610 | return dev; | |
611 | } | |
612 | ||
613 | struct amba_device * | |
614 | amba_apb_device_add(struct device *parent, const char *name, | |
615 | resource_size_t base, size_t size, int irq1, int irq2, | |
616 | void *pdata, unsigned int periphid) | |
617 | { | |
618 | return amba_aphb_device_add(parent, name, base, size, irq1, irq2, pdata, | |
3ad909bc | 619 | periphid, 0, &iomem_resource); |
6026aa90 LW |
620 | } |
621 | EXPORT_SYMBOL_GPL(amba_apb_device_add); | |
622 | ||
623 | struct amba_device * | |
624 | amba_ahb_device_add(struct device *parent, const char *name, | |
625 | resource_size_t base, size_t size, int irq1, int irq2, | |
626 | void *pdata, unsigned int periphid) | |
627 | { | |
628 | return amba_aphb_device_add(parent, name, base, size, irq1, irq2, pdata, | |
3ad909bc | 629 | periphid, ~0ULL, &iomem_resource); |
6026aa90 LW |
630 | } |
631 | EXPORT_SYMBOL_GPL(amba_ahb_device_add); | |
632 | ||
3ad909bc LW |
633 | struct amba_device * |
634 | amba_apb_device_add_res(struct device *parent, const char *name, | |
635 | resource_size_t base, size_t size, int irq1, | |
636 | int irq2, void *pdata, unsigned int periphid, | |
637 | struct resource *resbase) | |
638 | { | |
639 | return amba_aphb_device_add(parent, name, base, size, irq1, irq2, pdata, | |
640 | periphid, 0, resbase); | |
641 | } | |
642 | EXPORT_SYMBOL_GPL(amba_apb_device_add_res); | |
643 | ||
644 | struct amba_device * | |
645 | amba_ahb_device_add_res(struct device *parent, const char *name, | |
646 | resource_size_t base, size_t size, int irq1, | |
647 | int irq2, void *pdata, unsigned int periphid, | |
648 | struct resource *resbase) | |
649 | { | |
650 | return amba_aphb_device_add(parent, name, base, size, irq1, irq2, pdata, | |
651 | periphid, ~0ULL, resbase); | |
652 | } | |
653 | EXPORT_SYMBOL_GPL(amba_ahb_device_add_res); | |
654 | ||
655 | ||
d5dc9271 RK |
656 | static void amba_device_initialize(struct amba_device *dev, const char *name) |
657 | { | |
658 | device_initialize(&dev->dev); | |
659 | if (name) | |
660 | dev_set_name(&dev->dev, "%s", name); | |
661 | dev->dev.release = amba_device_release; | |
662 | dev->dev.bus = &amba_bustype; | |
446b2a93 | 663 | dev->dev.dma_mask = &dev->dev.coherent_dma_mask; |
f4584884 | 664 | dev->dev.dma_parms = &dev->dma_parms; |
d5dc9271 RK |
665 | dev->res.name = dev_name(&dev->dev); |
666 | } | |
667 | ||
668 | /** | |
669 | * amba_device_alloc - allocate an AMBA device | |
670 | * @name: sysfs name of the AMBA device | |
671 | * @base: base of AMBA device | |
672 | * @size: size of AMBA device | |
673 | * | |
674 | * Allocate and initialize an AMBA device structure. Returns %NULL | |
675 | * on failure. | |
676 | */ | |
677 | struct amba_device *amba_device_alloc(const char *name, resource_size_t base, | |
678 | size_t size) | |
679 | { | |
680 | struct amba_device *dev; | |
681 | ||
682 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
683 | if (dev) { | |
684 | amba_device_initialize(dev, name); | |
685 | dev->res.start = base; | |
686 | dev->res.end = base + size - 1; | |
687 | dev->res.flags = IORESOURCE_MEM; | |
688 | } | |
689 | ||
690 | return dev; | |
691 | } | |
692 | EXPORT_SYMBOL_GPL(amba_device_alloc); | |
693 | ||
694 | /** | |
695 | * amba_device_register - register an AMBA device | |
696 | * @dev: AMBA device to register | |
697 | * @parent: parent memory resource | |
698 | * | |
699 | * Setup the AMBA device, reading the cell ID if present. | |
700 | * Claim the resource, and register the AMBA device with | |
701 | * the Linux device manager. | |
702 | */ | |
703 | int amba_device_register(struct amba_device *dev, struct resource *parent) | |
704 | { | |
705 | amba_device_initialize(dev, dev->dev.init_name); | |
706 | dev->dev.init_name = NULL; | |
707 | ||
d5dc9271 RK |
708 | return amba_device_add(dev, parent); |
709 | } | |
710 | ||
711 | /** | |
712 | * amba_device_put - put an AMBA device | |
713 | * @dev: AMBA device to put | |
714 | */ | |
715 | void amba_device_put(struct amba_device *dev) | |
716 | { | |
717 | put_device(&dev->dev); | |
718 | } | |
719 | EXPORT_SYMBOL_GPL(amba_device_put); | |
1da177e4 LT |
720 | |
721 | /** | |
722 | * amba_device_unregister - unregister an AMBA device | |
723 | * @dev: AMBA device to remove | |
724 | * | |
725 | * Remove the specified AMBA device from the Linux device | |
726 | * manager. All files associated with this object will be | |
727 | * destroyed, and device drivers notified that the device has | |
728 | * been removed. The AMBA device's resources including | |
729 | * the amba_device structure will be freed once all | |
730 | * references to it have been dropped. | |
731 | */ | |
732 | void amba_device_unregister(struct amba_device *dev) | |
733 | { | |
734 | device_unregister(&dev->dev); | |
735 | } | |
736 | ||
737 | ||
738 | struct find_data { | |
739 | struct amba_device *dev; | |
740 | struct device *parent; | |
741 | const char *busid; | |
742 | unsigned int id; | |
743 | unsigned int mask; | |
744 | }; | |
745 | ||
746 | static int amba_find_match(struct device *dev, void *data) | |
747 | { | |
748 | struct find_data *d = data; | |
749 | struct amba_device *pcdev = to_amba_device(dev); | |
750 | int r; | |
751 | ||
752 | r = (pcdev->periphid & d->mask) == d->id; | |
753 | if (d->parent) | |
754 | r &= d->parent == dev->parent; | |
755 | if (d->busid) | |
9d6b4c82 | 756 | r &= strcmp(dev_name(dev), d->busid) == 0; |
1da177e4 LT |
757 | |
758 | if (r) { | |
759 | get_device(dev); | |
760 | d->dev = pcdev; | |
761 | } | |
762 | ||
763 | return r; | |
764 | } | |
765 | ||
766 | /** | |
767 | * amba_find_device - locate an AMBA device given a bus id | |
768 | * @busid: bus id for device (or NULL) | |
769 | * @parent: parent device (or NULL) | |
770 | * @id: peripheral ID (or 0) | |
771 | * @mask: peripheral ID mask (or 0) | |
772 | * | |
773 | * Return the AMBA device corresponding to the supplied parameters. | |
774 | * If no device matches, returns NULL. | |
775 | * | |
776 | * NOTE: When a valid device is found, its refcount is | |
777 | * incremented, and must be decremented before the returned | |
778 | * reference. | |
779 | */ | |
780 | struct amba_device * | |
781 | amba_find_device(const char *busid, struct device *parent, unsigned int id, | |
782 | unsigned int mask) | |
783 | { | |
784 | struct find_data data; | |
785 | ||
786 | data.dev = NULL; | |
787 | data.parent = parent; | |
788 | data.busid = busid; | |
789 | data.id = id; | |
790 | data.mask = mask; | |
791 | ||
792 | bus_for_each_dev(&amba_bustype, NULL, &data, amba_find_match); | |
793 | ||
794 | return data.dev; | |
795 | } | |
796 | ||
797 | /** | |
798 | * amba_request_regions - request all mem regions associated with device | |
799 | * @dev: amba_device structure for device | |
800 | * @name: name, or NULL to use driver name | |
801 | */ | |
802 | int amba_request_regions(struct amba_device *dev, const char *name) | |
803 | { | |
804 | int ret = 0; | |
8afe0b96 | 805 | u32 size; |
1da177e4 LT |
806 | |
807 | if (!name) | |
808 | name = dev->dev.driver->name; | |
809 | ||
8afe0b96 LC |
810 | size = resource_size(&dev->res); |
811 | ||
812 | if (!request_mem_region(dev->res.start, size, name)) | |
1da177e4 LT |
813 | ret = -EBUSY; |
814 | ||
815 | return ret; | |
816 | } | |
817 | ||
818 | /** | |
25985edc | 819 | * amba_release_regions - release mem regions associated with device |
1da177e4 LT |
820 | * @dev: amba_device structure for device |
821 | * | |
822 | * Release regions claimed by a successful call to amba_request_regions. | |
823 | */ | |
824 | void amba_release_regions(struct amba_device *dev) | |
825 | { | |
8afe0b96 LC |
826 | u32 size; |
827 | ||
828 | size = resource_size(&dev->res); | |
829 | release_mem_region(dev->res.start, size); | |
1da177e4 LT |
830 | } |
831 | ||
832 | EXPORT_SYMBOL(amba_driver_register); | |
833 | EXPORT_SYMBOL(amba_driver_unregister); | |
834 | EXPORT_SYMBOL(amba_device_register); | |
835 | EXPORT_SYMBOL(amba_device_unregister); | |
836 | EXPORT_SYMBOL(amba_find_device); | |
837 | EXPORT_SYMBOL(amba_request_regions); | |
838 | EXPORT_SYMBOL(amba_release_regions); |