Commit | Line | Data |
---|---|---|
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> |
1da177e4 | 21 | |
934848da | 22 | #include <asm/irq.h> |
1da177e4 | 23 | |
1da177e4 LT |
24 | #define to_amba_driver(d) container_of(d, struct amba_driver, drv) |
25 | ||
4a2910fa ML |
26 | /* called on periphid match and class 0x9 coresight device. */ |
27 | static int | |
28 | amba_cs_uci_id_match(const struct amba_id *table, struct amba_device *dev) | |
1da177e4 LT |
29 | { |
30 | int ret = 0; | |
4a2910fa ML |
31 | struct amba_cs_uci_id *uci; |
32 | ||
33 | uci = table->data; | |
1da177e4 | 34 | |
4a2910fa ML |
35 | /* no table data or zero mask - return match on periphid */ |
36 | if (!uci || (uci->devarch_mask == 0)) | |
37 | return 1; | |
38 | ||
39 | /* test against read devtype and masked devarch value */ | |
40 | ret = (dev->uci.devtype == uci->devtype) && | |
41 | ((dev->uci.devarch & uci->devarch_mask) == uci->devarch); | |
42 | return ret; | |
43 | } | |
44 | ||
45 | static const struct amba_id * | |
46 | amba_lookup(const struct amba_id *table, struct amba_device *dev) | |
47 | { | |
1da177e4 | 48 | while (table->mask) { |
4a2910fa ML |
49 | if (((dev->periphid & table->mask) == table->id) && |
50 | ((dev->cid != CORESIGHT_CID) || | |
51 | (amba_cs_uci_id_match(table, dev)))) | |
52 | return table; | |
1da177e4 LT |
53 | table++; |
54 | } | |
4a2910fa | 55 | return NULL; |
1da177e4 LT |
56 | } |
57 | ||
58 | static int amba_match(struct device *dev, struct device_driver *drv) | |
59 | { | |
60 | struct amba_device *pcdev = to_amba_device(dev); | |
61 | struct amba_driver *pcdrv = to_amba_driver(drv); | |
62 | ||
3cf38571 AM |
63 | /* When driver_override is set, only bind to the matching driver */ |
64 | if (pcdev->driver_override) | |
65 | return !strcmp(pcdev->driver_override, drv->name); | |
66 | ||
1da177e4 LT |
67 | return amba_lookup(pcdrv->id_table, pcdev) != NULL; |
68 | } | |
69 | ||
7eff2e7a | 70 | static int amba_uevent(struct device *dev, struct kobj_uevent_env *env) |
1da177e4 LT |
71 | { |
72 | struct amba_device *pcdev = to_amba_device(dev); | |
7eff2e7a | 73 | int retval = 0; |
1da177e4 | 74 | |
7eff2e7a | 75 | retval = add_uevent_var(env, "AMBA_ID=%08x", pcdev->periphid); |
523817bd DM |
76 | if (retval) |
77 | return retval; | |
78 | ||
79 | retval = add_uevent_var(env, "MODALIAS=amba:d%08X", pcdev->periphid); | |
bf62456e | 80 | return retval; |
1da177e4 | 81 | } |
1da177e4 | 82 | |
3cf38571 AM |
83 | static ssize_t driver_override_show(struct device *_dev, |
84 | struct device_attribute *attr, char *buf) | |
85 | { | |
86 | struct amba_device *dev = to_amba_device(_dev); | |
6a7228d9 | 87 | ssize_t len; |
3cf38571 | 88 | |
6a7228d9 GU |
89 | device_lock(_dev); |
90 | len = sprintf(buf, "%s\n", dev->driver_override); | |
91 | device_unlock(_dev); | |
92 | return len; | |
3cf38571 AM |
93 | } |
94 | ||
95 | static ssize_t driver_override_store(struct device *_dev, | |
96 | struct device_attribute *attr, | |
97 | const char *buf, size_t count) | |
98 | { | |
99 | struct amba_device *dev = to_amba_device(_dev); | |
6a7228d9 | 100 | char *driver_override, *old, *cp; |
3cf38571 | 101 | |
d2ffed51 GU |
102 | /* We need to keep extra room for a newline */ |
103 | if (count >= (PAGE_SIZE - 1)) | |
3cf38571 AM |
104 | return -EINVAL; |
105 | ||
106 | driver_override = kstrndup(buf, count, GFP_KERNEL); | |
107 | if (!driver_override) | |
108 | return -ENOMEM; | |
109 | ||
110 | cp = strchr(driver_override, '\n'); | |
111 | if (cp) | |
112 | *cp = '\0'; | |
113 | ||
6a7228d9 GU |
114 | device_lock(_dev); |
115 | old = dev->driver_override; | |
3cf38571 AM |
116 | if (strlen(driver_override)) { |
117 | dev->driver_override = driver_override; | |
118 | } else { | |
6be5b5b9 GU |
119 | kfree(driver_override); |
120 | dev->driver_override = NULL; | |
3cf38571 | 121 | } |
6a7228d9 | 122 | device_unlock(_dev); |
3cf38571 AM |
123 | |
124 | kfree(old); | |
125 | ||
126 | return count; | |
127 | } | |
966449a3 | 128 | static DEVICE_ATTR_RW(driver_override); |
3cf38571 | 129 | |
96b13f5c RK |
130 | #define amba_attr_func(name,fmt,arg...) \ |
131 | static ssize_t name##_show(struct device *_dev, \ | |
132 | struct device_attribute *attr, char *buf) \ | |
133 | { \ | |
134 | struct amba_device *dev = to_amba_device(_dev); \ | |
135 | return sprintf(buf, fmt, arg); \ | |
966449a3 GKH |
136 | } \ |
137 | static DEVICE_ATTR_RO(name) | |
96b13f5c RK |
138 | |
139 | amba_attr_func(id, "%08x\n", dev->periphid); | |
966449a3 GKH |
140 | amba_attr_func(irq0, "%u\n", dev->irq[0]); |
141 | amba_attr_func(irq1, "%u\n", dev->irq[1]); | |
96b13f5c RK |
142 | amba_attr_func(resource, "\t%016llx\t%016llx\t%016lx\n", |
143 | (unsigned long long)dev->res.start, (unsigned long long)dev->res.end, | |
144 | dev->res.flags); | |
145 | ||
966449a3 GKH |
146 | static struct attribute *amba_dev_attrs[] = { |
147 | &dev_attr_id.attr, | |
148 | &dev_attr_resource.attr, | |
149 | &dev_attr_driver_override.attr, | |
150 | NULL, | |
96b13f5c | 151 | }; |
966449a3 | 152 | ATTRIBUTE_GROUPS(amba_dev); |
96b13f5c | 153 | |
f210c53a | 154 | #ifdef CONFIG_PM |
92b97f0a RK |
155 | /* |
156 | * Hooks to provide runtime PM of the pclk (bus clock). It is safe to | |
157 | * enable/disable the bus clock at runtime PM suspend/resume as this | |
1e45860f | 158 | * does not result in loss of context. |
92b97f0a RK |
159 | */ |
160 | static int amba_pm_runtime_suspend(struct device *dev) | |
161 | { | |
162 | struct amba_device *pcdev = to_amba_device(dev); | |
163 | int ret = pm_generic_runtime_suspend(dev); | |
164 | ||
5670c2a5 KK |
165 | if (ret == 0 && dev->driver) { |
166 | if (pm_runtime_is_irq_safe(dev)) | |
167 | clk_disable(pcdev->pclk); | |
168 | else | |
169 | clk_disable_unprepare(pcdev->pclk); | |
170 | } | |
92b97f0a RK |
171 | |
172 | return ret; | |
173 | } | |
174 | ||
175 | static int amba_pm_runtime_resume(struct device *dev) | |
176 | { | |
177 | struct amba_device *pcdev = to_amba_device(dev); | |
178 | int ret; | |
179 | ||
180 | if (dev->driver) { | |
5670c2a5 KK |
181 | if (pm_runtime_is_irq_safe(dev)) |
182 | ret = clk_enable(pcdev->pclk); | |
183 | else | |
184 | ret = clk_prepare_enable(pcdev->pclk); | |
92b97f0a RK |
185 | /* Failure is probably fatal to the system, but... */ |
186 | if (ret) | |
187 | return ret; | |
188 | } | |
189 | ||
190 | return pm_generic_runtime_resume(dev); | |
191 | } | |
5670c2a5 | 192 | #endif /* CONFIG_PM */ |
92b97f0a | 193 | |
ba74ec7f | 194 | static const struct dev_pm_ops amba_pm = { |
26825cfd UH |
195 | .suspend = pm_generic_suspend, |
196 | .resume = pm_generic_resume, | |
197 | .freeze = pm_generic_freeze, | |
198 | .thaw = pm_generic_thaw, | |
199 | .poweroff = pm_generic_poweroff, | |
200 | .restore = pm_generic_restore, | |
6ed23b80 | 201 | SET_RUNTIME_PM_OPS( |
92b97f0a RK |
202 | amba_pm_runtime_suspend, |
203 | amba_pm_runtime_resume, | |
45f0a85c | 204 | NULL |
ba74ec7f RV |
205 | ) |
206 | }; | |
207 | ||
1da177e4 LT |
208 | /* |
209 | * Primecells are part of the Advanced Microcontroller Bus Architecture, | |
210 | * so we call the bus "amba". | |
07397df2 NG |
211 | * DMA configuration for platform and AMBA bus is same. So here we reuse |
212 | * platform's DMA config routine. | |
1da177e4 | 213 | */ |
394d5aef | 214 | struct bus_type amba_bustype = { |
1da177e4 | 215 | .name = "amba", |
966449a3 | 216 | .dev_groups = amba_dev_groups, |
1da177e4 | 217 | .match = amba_match, |
6d20b035 | 218 | .uevent = amba_uevent, |
07397df2 | 219 | .dma_configure = platform_dma_configure, |
26825cfd | 220 | .pm = &amba_pm, |
1da177e4 | 221 | }; |
e9ac68c3 | 222 | EXPORT_SYMBOL_GPL(amba_bustype); |
1da177e4 LT |
223 | |
224 | static int __init amba_init(void) | |
225 | { | |
226 | return bus_register(&amba_bustype); | |
227 | } | |
228 | ||
229 | postcore_initcall(amba_init); | |
230 | ||
7cfe2494 RK |
231 | static int amba_get_enable_pclk(struct amba_device *pcdev) |
232 | { | |
7cfe2494 RK |
233 | int ret; |
234 | ||
89a5c985 UH |
235 | pcdev->pclk = clk_get(&pcdev->dev, "apb_pclk"); |
236 | if (IS_ERR(pcdev->pclk)) | |
237 | return PTR_ERR(pcdev->pclk); | |
7cfe2494 | 238 | |
89a5c985 UH |
239 | ret = clk_prepare_enable(pcdev->pclk); |
240 | if (ret) | |
241 | clk_put(pcdev->pclk); | |
7cfe2494 RK |
242 | |
243 | return ret; | |
244 | } | |
245 | ||
246 | static void amba_put_disable_pclk(struct amba_device *pcdev) | |
247 | { | |
89a5c985 UH |
248 | clk_disable_unprepare(pcdev->pclk); |
249 | clk_put(pcdev->pclk); | |
7cfe2494 RK |
250 | } |
251 | ||
1da177e4 LT |
252 | /* |
253 | * These are the device model conversion veneers; they convert the | |
254 | * device model structures to our more specific structures. | |
255 | */ | |
256 | static int amba_probe(struct device *dev) | |
257 | { | |
258 | struct amba_device *pcdev = to_amba_device(dev); | |
259 | struct amba_driver *pcdrv = to_amba_driver(dev->driver); | |
c862aab0 | 260 | const struct amba_id *id = amba_lookup(pcdrv->id_table, pcdev); |
7cfe2494 | 261 | int ret; |
1da177e4 | 262 | |
7cfe2494 | 263 | do { |
bcd3006f SB |
264 | ret = of_clk_set_defaults(dev->of_node, false); |
265 | if (ret < 0) | |
266 | break; | |
267 | ||
207f1a2d | 268 | ret = dev_pm_domain_attach(dev, true); |
d21bc89e | 269 | if (ret) |
207f1a2d UH |
270 | break; |
271 | ||
7cfe2494 | 272 | ret = amba_get_enable_pclk(pcdev); |
207f1a2d UH |
273 | if (ret) { |
274 | dev_pm_domain_detach(dev, true); | |
7cfe2494 | 275 | break; |
207f1a2d | 276 | } |
7cfe2494 | 277 | |
92b97f0a RK |
278 | pm_runtime_get_noresume(dev); |
279 | pm_runtime_set_active(dev); | |
280 | pm_runtime_enable(dev); | |
281 | ||
7cfe2494 RK |
282 | ret = pcdrv->probe(pcdev, id); |
283 | if (ret == 0) | |
284 | break; | |
1da177e4 | 285 | |
92b97f0a RK |
286 | pm_runtime_disable(dev); |
287 | pm_runtime_set_suspended(dev); | |
288 | pm_runtime_put_noidle(dev); | |
289 | ||
7cfe2494 | 290 | amba_put_disable_pclk(pcdev); |
207f1a2d | 291 | dev_pm_domain_detach(dev, true); |
7cfe2494 RK |
292 | } while (0); |
293 | ||
294 | return ret; | |
1da177e4 LT |
295 | } |
296 | ||
297 | static int amba_remove(struct device *dev) | |
298 | { | |
7cfe2494 | 299 | struct amba_device *pcdev = to_amba_device(dev); |
1da177e4 | 300 | struct amba_driver *drv = to_amba_driver(dev->driver); |
92b97f0a RK |
301 | int ret; |
302 | ||
303 | pm_runtime_get_sync(dev); | |
304 | ret = drv->remove(pcdev); | |
305 | pm_runtime_put_noidle(dev); | |
306 | ||
307 | /* Undo the runtime PM settings in amba_probe() */ | |
308 | pm_runtime_disable(dev); | |
309 | pm_runtime_set_suspended(dev); | |
310 | pm_runtime_put_noidle(dev); | |
7cfe2494 RK |
311 | |
312 | amba_put_disable_pclk(pcdev); | |
207f1a2d | 313 | dev_pm_domain_detach(dev, true); |
7cfe2494 RK |
314 | |
315 | return ret; | |
1da177e4 LT |
316 | } |
317 | ||
318 | static void amba_shutdown(struct device *dev) | |
319 | { | |
320 | struct amba_driver *drv = to_amba_driver(dev->driver); | |
321 | drv->shutdown(to_amba_device(dev)); | |
322 | } | |
323 | ||
324 | /** | |
325 | * amba_driver_register - register an AMBA device driver | |
326 | * @drv: amba device driver structure | |
327 | * | |
328 | * Register an AMBA device driver with the Linux device model | |
329 | * core. If devices pre-exist, the drivers probe function will | |
330 | * be called. | |
331 | */ | |
332 | int amba_driver_register(struct amba_driver *drv) | |
333 | { | |
334 | drv->drv.bus = &amba_bustype; | |
335 | ||
336 | #define SETFN(fn) if (drv->fn) drv->drv.fn = amba_##fn | |
337 | SETFN(probe); | |
338 | SETFN(remove); | |
339 | SETFN(shutdown); | |
340 | ||
341 | return driver_register(&drv->drv); | |
342 | } | |
343 | ||
344 | /** | |
345 | * amba_driver_unregister - remove an AMBA device driver | |
346 | * @drv: AMBA device driver structure to remove | |
347 | * | |
348 | * Unregister an AMBA device driver from the Linux device | |
349 | * model. The device model will call the drivers remove function | |
350 | * for each device the device driver is currently handling. | |
351 | */ | |
352 | void amba_driver_unregister(struct amba_driver *drv) | |
353 | { | |
354 | driver_unregister(&drv->drv); | |
355 | } | |
356 | ||
357 | ||
358 | static void amba_device_release(struct device *dev) | |
359 | { | |
360 | struct amba_device *d = to_amba_device(dev); | |
361 | ||
362 | if (d->res.parent) | |
363 | release_resource(&d->res); | |
364 | kfree(d); | |
365 | } | |
366 | ||
a41980f2 | 367 | static int amba_device_try_add(struct amba_device *dev, struct resource *parent) |
1da177e4 | 368 | { |
8afe0b96 | 369 | u32 size; |
1da177e4 LT |
370 | void __iomem *tmp; |
371 | int i, ret; | |
372 | ||
2eac58d5 RK |
373 | WARN_ON(dev->irq[0] == (unsigned int)-1); |
374 | WARN_ON(dev->irq[1] == (unsigned int)-1); | |
375 | ||
1da177e4 | 376 | ret = request_resource(parent, &dev->res); |
96b13f5c RK |
377 | if (ret) |
378 | goto err_out; | |
379 | ||
97ceed1f LW |
380 | /* Hard-coded primecell ID instead of plug-n-play */ |
381 | if (dev->periphid != 0) | |
382 | goto skip_probe; | |
383 | ||
8afe0b96 LC |
384 | /* |
385 | * Dynamically calculate the size of the resource | |
386 | * and use this for iomap | |
387 | */ | |
388 | size = resource_size(&dev->res); | |
389 | tmp = ioremap(dev->res.start, size); | |
96b13f5c RK |
390 | if (!tmp) { |
391 | ret = -ENOMEM; | |
392 | goto err_release; | |
1da177e4 | 393 | } |
96b13f5c | 394 | |
a41980f2 | 395 | ret = dev_pm_domain_attach(&dev->dev, true); |
d21bc89e | 396 | if (ret) { |
a41980f2 MS |
397 | iounmap(tmp); |
398 | goto err_release; | |
399 | } | |
400 | ||
7cfe2494 RK |
401 | ret = amba_get_enable_pclk(dev); |
402 | if (ret == 0) { | |
403 | u32 pid, cid; | |
96b13f5c | 404 | |
7cfe2494 RK |
405 | /* |
406 | * Read pid and cid based on size of resource | |
407 | * they are located at end of region | |
408 | */ | |
409 | for (pid = 0, i = 0; i < 4; i++) | |
410 | pid |= (readl(tmp + size - 0x20 + 4 * i) & 255) << | |
411 | (i * 8); | |
412 | for (cid = 0, i = 0; i < 4; i++) | |
413 | cid |= (readl(tmp + size - 0x10 + 4 * i) & 255) << | |
414 | (i * 8); | |
96b13f5c | 415 | |
4a2910fa ML |
416 | if (cid == CORESIGHT_CID) { |
417 | /* set the base to the start of the last 4k block */ | |
418 | void __iomem *csbase = tmp + size - 4096; | |
419 | ||
420 | dev->uci.devarch = | |
421 | readl(csbase + UCI_REG_DEVARCH_OFFSET); | |
422 | dev->uci.devtype = | |
423 | readl(csbase + UCI_REG_DEVTYPE_OFFSET) & 0xff; | |
424 | } | |
425 | ||
7cfe2494 | 426 | amba_put_disable_pclk(dev); |
96b13f5c | 427 | |
4a2910fa | 428 | if (cid == AMBA_CID || cid == CORESIGHT_CID) { |
7cfe2494 | 429 | dev->periphid = pid; |
4a2910fa ML |
430 | dev->cid = cid; |
431 | } | |
7cfe2494 RK |
432 | |
433 | if (!dev->periphid) | |
434 | ret = -ENODEV; | |
96b13f5c RK |
435 | } |
436 | ||
7cfe2494 | 437 | iounmap(tmp); |
a41980f2 | 438 | dev_pm_domain_detach(&dev->dev, true); |
7cfe2494 RK |
439 | |
440 | if (ret) | |
441 | goto err_release; | |
442 | ||
97ceed1f | 443 | skip_probe: |
557dca5f | 444 | ret = device_add(&dev->dev); |
96b13f5c RK |
445 | if (ret) |
446 | goto err_release; | |
447 | ||
dfb85185 | 448 | if (dev->irq[0]) |
96b13f5c | 449 | ret = device_create_file(&dev->dev, &dev_attr_irq0); |
dfb85185 | 450 | if (ret == 0 && dev->irq[1]) |
96b13f5c RK |
451 | ret = device_create_file(&dev->dev, &dev_attr_irq1); |
452 | if (ret == 0) | |
453 | return ret; | |
454 | ||
455 | device_unregister(&dev->dev); | |
456 | ||
457 | err_release: | |
458 | release_resource(&dev->res); | |
459 | err_out: | |
1da177e4 LT |
460 | return ret; |
461 | } | |
a41980f2 MS |
462 | |
463 | /* | |
464 | * Registration of AMBA device require reading its pid and cid registers. | |
465 | * To do this, the device must be turned on (if it is a part of power domain) | |
466 | * and have clocks enabled. However in some cases those resources might not be | |
467 | * yet available. Returning EPROBE_DEFER is not a solution in such case, | |
468 | * because callers don't handle this special error code. Instead such devices | |
469 | * are added to the special list and their registration is retried from | |
470 | * periodic worker, until all resources are available and registration succeeds. | |
471 | */ | |
472 | struct deferred_device { | |
473 | struct amba_device *dev; | |
474 | struct resource *parent; | |
475 | struct list_head node; | |
476 | }; | |
477 | ||
478 | static LIST_HEAD(deferred_devices); | |
479 | static DEFINE_MUTEX(deferred_devices_lock); | |
480 | ||
481 | static void amba_deferred_retry_func(struct work_struct *dummy); | |
482 | static DECLARE_DELAYED_WORK(deferred_retry_work, amba_deferred_retry_func); | |
483 | ||
484 | #define DEFERRED_DEVICE_TIMEOUT (msecs_to_jiffies(5 * 1000)) | |
485 | ||
486 | static void amba_deferred_retry_func(struct work_struct *dummy) | |
487 | { | |
488 | struct deferred_device *ddev, *tmp; | |
489 | ||
490 | mutex_lock(&deferred_devices_lock); | |
491 | ||
492 | list_for_each_entry_safe(ddev, tmp, &deferred_devices, node) { | |
493 | int ret = amba_device_try_add(ddev->dev, ddev->parent); | |
494 | ||
495 | if (ret == -EPROBE_DEFER) | |
496 | continue; | |
497 | ||
498 | list_del_init(&ddev->node); | |
499 | kfree(ddev); | |
500 | } | |
501 | ||
502 | if (!list_empty(&deferred_devices)) | |
503 | schedule_delayed_work(&deferred_retry_work, | |
504 | DEFERRED_DEVICE_TIMEOUT); | |
505 | ||
506 | mutex_unlock(&deferred_devices_lock); | |
507 | } | |
508 | ||
509 | /** | |
510 | * amba_device_add - add a previously allocated AMBA device structure | |
511 | * @dev: AMBA device allocated by amba_device_alloc | |
512 | * @parent: resource parent for this devices resources | |
513 | * | |
514 | * Claim the resource, and read the device cell ID if not already | |
515 | * initialized. Register the AMBA device with the Linux device | |
516 | * manager. | |
517 | */ | |
518 | int amba_device_add(struct amba_device *dev, struct resource *parent) | |
519 | { | |
520 | int ret = amba_device_try_add(dev, parent); | |
521 | ||
522 | if (ret == -EPROBE_DEFER) { | |
523 | struct deferred_device *ddev; | |
524 | ||
525 | ddev = kmalloc(sizeof(*ddev), GFP_KERNEL); | |
526 | if (!ddev) | |
527 | return -ENOMEM; | |
528 | ||
529 | ddev->dev = dev; | |
530 | ddev->parent = parent; | |
531 | ret = 0; | |
532 | ||
533 | mutex_lock(&deferred_devices_lock); | |
534 | ||
535 | if (list_empty(&deferred_devices)) | |
536 | schedule_delayed_work(&deferred_retry_work, | |
537 | DEFERRED_DEVICE_TIMEOUT); | |
538 | list_add_tail(&ddev->node, &deferred_devices); | |
539 | ||
540 | mutex_unlock(&deferred_devices_lock); | |
541 | } | |
542 | return ret; | |
543 | } | |
d5dc9271 RK |
544 | EXPORT_SYMBOL_GPL(amba_device_add); |
545 | ||
6026aa90 LW |
546 | static struct amba_device * |
547 | amba_aphb_device_add(struct device *parent, const char *name, | |
548 | resource_size_t base, size_t size, int irq1, int irq2, | |
3ad909bc LW |
549 | void *pdata, unsigned int periphid, u64 dma_mask, |
550 | struct resource *resbase) | |
6026aa90 LW |
551 | { |
552 | struct amba_device *dev; | |
553 | int ret; | |
554 | ||
555 | dev = amba_device_alloc(name, base, size); | |
556 | if (!dev) | |
557 | return ERR_PTR(-ENOMEM); | |
558 | ||
6026aa90 LW |
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 | ||
3ad909bc | 566 | ret = amba_device_add(dev, resbase); |
6026aa90 LW |
567 | if (ret) { |
568 | amba_device_put(dev); | |
569 | return ERR_PTR(ret); | |
570 | } | |
571 | ||
572 | return dev; | |
573 | } | |
574 | ||
575 | struct amba_device * | |
576 | amba_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, | |
3ad909bc | 581 | periphid, 0, &iomem_resource); |
6026aa90 LW |
582 | } |
583 | EXPORT_SYMBOL_GPL(amba_apb_device_add); | |
584 | ||
585 | struct amba_device * | |
586 | amba_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, | |
3ad909bc | 591 | periphid, ~0ULL, &iomem_resource); |
6026aa90 LW |
592 | } |
593 | EXPORT_SYMBOL_GPL(amba_ahb_device_add); | |
594 | ||
3ad909bc LW |
595 | struct amba_device * |
596 | amba_apb_device_add_res(struct device *parent, const char *name, | |
597 | resource_size_t base, size_t size, int irq1, | |
598 | int irq2, void *pdata, unsigned int periphid, | |
599 | struct resource *resbase) | |
600 | { | |
601 | return amba_aphb_device_add(parent, name, base, size, irq1, irq2, pdata, | |
602 | periphid, 0, resbase); | |
603 | } | |
604 | EXPORT_SYMBOL_GPL(amba_apb_device_add_res); | |
605 | ||
606 | struct amba_device * | |
607 | amba_ahb_device_add_res(struct device *parent, const char *name, | |
608 | resource_size_t base, size_t size, int irq1, | |
609 | int irq2, void *pdata, unsigned int periphid, | |
610 | struct resource *resbase) | |
611 | { | |
612 | return amba_aphb_device_add(parent, name, base, size, irq1, irq2, pdata, | |
613 | periphid, ~0ULL, resbase); | |
614 | } | |
615 | EXPORT_SYMBOL_GPL(amba_ahb_device_add_res); | |
616 | ||
617 | ||
d5dc9271 RK |
618 | static void amba_device_initialize(struct amba_device *dev, const char *name) |
619 | { | |
620 | device_initialize(&dev->dev); | |
621 | if (name) | |
622 | dev_set_name(&dev->dev, "%s", name); | |
623 | dev->dev.release = amba_device_release; | |
624 | dev->dev.bus = &amba_bustype; | |
446b2a93 | 625 | dev->dev.dma_mask = &dev->dev.coherent_dma_mask; |
d5dc9271 RK |
626 | dev->res.name = dev_name(&dev->dev); |
627 | } | |
628 | ||
629 | /** | |
630 | * amba_device_alloc - allocate an AMBA device | |
631 | * @name: sysfs name of the AMBA device | |
632 | * @base: base of AMBA device | |
633 | * @size: size of AMBA device | |
634 | * | |
635 | * Allocate and initialize an AMBA device structure. Returns %NULL | |
636 | * on failure. | |
637 | */ | |
638 | struct amba_device *amba_device_alloc(const char *name, resource_size_t base, | |
639 | size_t size) | |
640 | { | |
641 | struct amba_device *dev; | |
642 | ||
643 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
644 | if (dev) { | |
645 | amba_device_initialize(dev, name); | |
646 | dev->res.start = base; | |
647 | dev->res.end = base + size - 1; | |
648 | dev->res.flags = IORESOURCE_MEM; | |
649 | } | |
650 | ||
651 | return dev; | |
652 | } | |
653 | EXPORT_SYMBOL_GPL(amba_device_alloc); | |
654 | ||
655 | /** | |
656 | * amba_device_register - register an AMBA device | |
657 | * @dev: AMBA device to register | |
658 | * @parent: parent memory resource | |
659 | * | |
660 | * Setup the AMBA device, reading the cell ID if present. | |
661 | * Claim the resource, and register the AMBA device with | |
662 | * the Linux device manager. | |
663 | */ | |
664 | int amba_device_register(struct amba_device *dev, struct resource *parent) | |
665 | { | |
666 | amba_device_initialize(dev, dev->dev.init_name); | |
667 | dev->dev.init_name = NULL; | |
668 | ||
d5dc9271 RK |
669 | return amba_device_add(dev, parent); |
670 | } | |
671 | ||
672 | /** | |
673 | * amba_device_put - put an AMBA device | |
674 | * @dev: AMBA device to put | |
675 | */ | |
676 | void amba_device_put(struct amba_device *dev) | |
677 | { | |
678 | put_device(&dev->dev); | |
679 | } | |
680 | EXPORT_SYMBOL_GPL(amba_device_put); | |
1da177e4 LT |
681 | |
682 | /** | |
683 | * amba_device_unregister - unregister an AMBA device | |
684 | * @dev: AMBA device to remove | |
685 | * | |
686 | * Remove the specified AMBA device from the Linux device | |
687 | * manager. All files associated with this object will be | |
688 | * destroyed, and device drivers notified that the device has | |
689 | * been removed. The AMBA device's resources including | |
690 | * the amba_device structure will be freed once all | |
691 | * references to it have been dropped. | |
692 | */ | |
693 | void amba_device_unregister(struct amba_device *dev) | |
694 | { | |
695 | device_unregister(&dev->dev); | |
696 | } | |
697 | ||
698 | ||
699 | struct find_data { | |
700 | struct amba_device *dev; | |
701 | struct device *parent; | |
702 | const char *busid; | |
703 | unsigned int id; | |
704 | unsigned int mask; | |
705 | }; | |
706 | ||
707 | static int amba_find_match(struct device *dev, void *data) | |
708 | { | |
709 | struct find_data *d = data; | |
710 | struct amba_device *pcdev = to_amba_device(dev); | |
711 | int r; | |
712 | ||
713 | r = (pcdev->periphid & d->mask) == d->id; | |
714 | if (d->parent) | |
715 | r &= d->parent == dev->parent; | |
716 | if (d->busid) | |
9d6b4c82 | 717 | r &= strcmp(dev_name(dev), d->busid) == 0; |
1da177e4 LT |
718 | |
719 | if (r) { | |
720 | get_device(dev); | |
721 | d->dev = pcdev; | |
722 | } | |
723 | ||
724 | return r; | |
725 | } | |
726 | ||
727 | /** | |
728 | * amba_find_device - locate an AMBA device given a bus id | |
729 | * @busid: bus id for device (or NULL) | |
730 | * @parent: parent device (or NULL) | |
731 | * @id: peripheral ID (or 0) | |
732 | * @mask: peripheral ID mask (or 0) | |
733 | * | |
734 | * Return the AMBA device corresponding to the supplied parameters. | |
735 | * If no device matches, returns NULL. | |
736 | * | |
737 | * NOTE: When a valid device is found, its refcount is | |
738 | * incremented, and must be decremented before the returned | |
739 | * reference. | |
740 | */ | |
741 | struct amba_device * | |
742 | amba_find_device(const char *busid, struct device *parent, unsigned int id, | |
743 | unsigned int mask) | |
744 | { | |
745 | struct find_data data; | |
746 | ||
747 | data.dev = NULL; | |
748 | data.parent = parent; | |
749 | data.busid = busid; | |
750 | data.id = id; | |
751 | data.mask = mask; | |
752 | ||
753 | bus_for_each_dev(&amba_bustype, NULL, &data, amba_find_match); | |
754 | ||
755 | return data.dev; | |
756 | } | |
757 | ||
758 | /** | |
759 | * amba_request_regions - request all mem regions associated with device | |
760 | * @dev: amba_device structure for device | |
761 | * @name: name, or NULL to use driver name | |
762 | */ | |
763 | int amba_request_regions(struct amba_device *dev, const char *name) | |
764 | { | |
765 | int ret = 0; | |
8afe0b96 | 766 | u32 size; |
1da177e4 LT |
767 | |
768 | if (!name) | |
769 | name = dev->dev.driver->name; | |
770 | ||
8afe0b96 LC |
771 | size = resource_size(&dev->res); |
772 | ||
773 | if (!request_mem_region(dev->res.start, size, name)) | |
1da177e4 LT |
774 | ret = -EBUSY; |
775 | ||
776 | return ret; | |
777 | } | |
778 | ||
779 | /** | |
25985edc | 780 | * amba_release_regions - release mem regions associated with device |
1da177e4 LT |
781 | * @dev: amba_device structure for device |
782 | * | |
783 | * Release regions claimed by a successful call to amba_request_regions. | |
784 | */ | |
785 | void amba_release_regions(struct amba_device *dev) | |
786 | { | |
8afe0b96 LC |
787 | u32 size; |
788 | ||
789 | size = resource_size(&dev->res); | |
790 | release_mem_region(dev->res.start, size); | |
1da177e4 LT |
791 | } |
792 | ||
793 | EXPORT_SYMBOL(amba_driver_register); | |
794 | EXPORT_SYMBOL(amba_driver_unregister); | |
795 | EXPORT_SYMBOL(amba_device_register); | |
796 | EXPORT_SYMBOL(amba_device_unregister); | |
797 | EXPORT_SYMBOL(amba_find_device); | |
798 | EXPORT_SYMBOL(amba_request_regions); | |
799 | EXPORT_SYMBOL(amba_release_regions); |