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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 | ||
59 | static int amba_match(struct device *dev, struct device_driver *drv) | |
60 | { | |
61 | struct amba_device *pcdev = to_amba_device(dev); | |
62 | struct amba_driver *pcdrv = to_amba_driver(drv); | |
63 | ||
3cf38571 AM |
64 | /* When driver_override is set, only bind to the matching driver */ |
65 | if (pcdev->driver_override) | |
66 | return !strcmp(pcdev->driver_override, drv->name); | |
67 | ||
1da177e4 LT |
68 | return amba_lookup(pcdrv->id_table, pcdev) != NULL; |
69 | } | |
70 | ||
7eff2e7a | 71 | static int amba_uevent(struct device *dev, struct kobj_uevent_env *env) |
1da177e4 LT |
72 | { |
73 | struct amba_device *pcdev = to_amba_device(dev); | |
7eff2e7a | 74 | int retval = 0; |
1da177e4 | 75 | |
7eff2e7a | 76 | retval = add_uevent_var(env, "AMBA_ID=%08x", pcdev->periphid); |
523817bd DM |
77 | if (retval) |
78 | return retval; | |
79 | ||
80 | retval = add_uevent_var(env, "MODALIAS=amba:d%08X", pcdev->periphid); | |
bf62456e | 81 | return retval; |
1da177e4 | 82 | } |
1da177e4 | 83 | |
3cf38571 AM |
84 | static ssize_t driver_override_show(struct device *_dev, |
85 | struct device_attribute *attr, char *buf) | |
86 | { | |
87 | struct amba_device *dev = to_amba_device(_dev); | |
6a7228d9 | 88 | ssize_t len; |
3cf38571 | 89 | |
6a7228d9 GU |
90 | device_lock(_dev); |
91 | len = sprintf(buf, "%s\n", dev->driver_override); | |
92 | device_unlock(_dev); | |
93 | return len; | |
3cf38571 AM |
94 | } |
95 | ||
96 | static ssize_t driver_override_store(struct device *_dev, | |
97 | struct device_attribute *attr, | |
98 | const char *buf, size_t count) | |
99 | { | |
100 | struct amba_device *dev = to_amba_device(_dev); | |
6a7228d9 | 101 | char *driver_override, *old, *cp; |
3cf38571 | 102 | |
d2ffed51 GU |
103 | /* We need to keep extra room for a newline */ |
104 | if (count >= (PAGE_SIZE - 1)) | |
3cf38571 AM |
105 | return -EINVAL; |
106 | ||
107 | driver_override = kstrndup(buf, count, GFP_KERNEL); | |
108 | if (!driver_override) | |
109 | return -ENOMEM; | |
110 | ||
111 | cp = strchr(driver_override, '\n'); | |
112 | if (cp) | |
113 | *cp = '\0'; | |
114 | ||
6a7228d9 GU |
115 | device_lock(_dev); |
116 | old = dev->driver_override; | |
3cf38571 AM |
117 | if (strlen(driver_override)) { |
118 | dev->driver_override = driver_override; | |
119 | } else { | |
6be5b5b9 GU |
120 | kfree(driver_override); |
121 | dev->driver_override = NULL; | |
3cf38571 | 122 | } |
6a7228d9 | 123 | device_unlock(_dev); |
3cf38571 AM |
124 | |
125 | kfree(old); | |
126 | ||
127 | return count; | |
128 | } | |
966449a3 | 129 | static DEVICE_ATTR_RW(driver_override); |
3cf38571 | 130 | |
96b13f5c RK |
131 | #define amba_attr_func(name,fmt,arg...) \ |
132 | static ssize_t name##_show(struct device *_dev, \ | |
133 | struct device_attribute *attr, char *buf) \ | |
134 | { \ | |
135 | struct amba_device *dev = to_amba_device(_dev); \ | |
136 | return sprintf(buf, fmt, arg); \ | |
966449a3 GKH |
137 | } \ |
138 | static DEVICE_ATTR_RO(name) | |
96b13f5c RK |
139 | |
140 | amba_attr_func(id, "%08x\n", dev->periphid); | |
966449a3 GKH |
141 | amba_attr_func(irq0, "%u\n", dev->irq[0]); |
142 | amba_attr_func(irq1, "%u\n", dev->irq[1]); | |
96b13f5c RK |
143 | amba_attr_func(resource, "\t%016llx\t%016llx\t%016lx\n", |
144 | (unsigned long long)dev->res.start, (unsigned long long)dev->res.end, | |
145 | dev->res.flags); | |
146 | ||
966449a3 GKH |
147 | static struct attribute *amba_dev_attrs[] = { |
148 | &dev_attr_id.attr, | |
149 | &dev_attr_resource.attr, | |
150 | &dev_attr_driver_override.attr, | |
151 | NULL, | |
96b13f5c | 152 | }; |
966449a3 | 153 | ATTRIBUTE_GROUPS(amba_dev); |
96b13f5c | 154 | |
f210c53a | 155 | #ifdef CONFIG_PM |
92b97f0a RK |
156 | /* |
157 | * Hooks to provide runtime PM of the pclk (bus clock). It is safe to | |
158 | * enable/disable the bus clock at runtime PM suspend/resume as this | |
1e45860f | 159 | * does not result in loss of context. |
92b97f0a RK |
160 | */ |
161 | static int amba_pm_runtime_suspend(struct device *dev) | |
162 | { | |
163 | struct amba_device *pcdev = to_amba_device(dev); | |
164 | int ret = pm_generic_runtime_suspend(dev); | |
165 | ||
5670c2a5 KK |
166 | if (ret == 0 && dev->driver) { |
167 | if (pm_runtime_is_irq_safe(dev)) | |
168 | clk_disable(pcdev->pclk); | |
169 | else | |
170 | clk_disable_unprepare(pcdev->pclk); | |
171 | } | |
92b97f0a RK |
172 | |
173 | return ret; | |
174 | } | |
175 | ||
176 | static int amba_pm_runtime_resume(struct device *dev) | |
177 | { | |
178 | struct amba_device *pcdev = to_amba_device(dev); | |
179 | int ret; | |
180 | ||
181 | if (dev->driver) { | |
5670c2a5 KK |
182 | if (pm_runtime_is_irq_safe(dev)) |
183 | ret = clk_enable(pcdev->pclk); | |
184 | else | |
185 | ret = clk_prepare_enable(pcdev->pclk); | |
92b97f0a RK |
186 | /* Failure is probably fatal to the system, but... */ |
187 | if (ret) | |
188 | return ret; | |
189 | } | |
190 | ||
191 | return pm_generic_runtime_resume(dev); | |
192 | } | |
5670c2a5 | 193 | #endif /* CONFIG_PM */ |
92b97f0a | 194 | |
ba74ec7f | 195 | static const struct dev_pm_ops amba_pm = { |
26825cfd UH |
196 | .suspend = pm_generic_suspend, |
197 | .resume = pm_generic_resume, | |
198 | .freeze = pm_generic_freeze, | |
199 | .thaw = pm_generic_thaw, | |
200 | .poweroff = pm_generic_poweroff, | |
201 | .restore = pm_generic_restore, | |
6ed23b80 | 202 | SET_RUNTIME_PM_OPS( |
92b97f0a RK |
203 | amba_pm_runtime_suspend, |
204 | amba_pm_runtime_resume, | |
45f0a85c | 205 | NULL |
ba74ec7f RV |
206 | ) |
207 | }; | |
208 | ||
1da177e4 LT |
209 | /* |
210 | * Primecells are part of the Advanced Microcontroller Bus Architecture, | |
211 | * so we call the bus "amba". | |
07397df2 NG |
212 | * DMA configuration for platform and AMBA bus is same. So here we reuse |
213 | * platform's DMA config routine. | |
1da177e4 | 214 | */ |
394d5aef | 215 | struct bus_type amba_bustype = { |
1da177e4 | 216 | .name = "amba", |
966449a3 | 217 | .dev_groups = amba_dev_groups, |
1da177e4 | 218 | .match = amba_match, |
6d20b035 | 219 | .uevent = amba_uevent, |
07397df2 | 220 | .dma_configure = platform_dma_configure, |
26825cfd | 221 | .pm = &amba_pm, |
1da177e4 | 222 | }; |
e9ac68c3 | 223 | EXPORT_SYMBOL_GPL(amba_bustype); |
1da177e4 LT |
224 | |
225 | static int __init amba_init(void) | |
226 | { | |
227 | return bus_register(&amba_bustype); | |
228 | } | |
229 | ||
230 | postcore_initcall(amba_init); | |
231 | ||
7cfe2494 RK |
232 | static int amba_get_enable_pclk(struct amba_device *pcdev) |
233 | { | |
7cfe2494 RK |
234 | int ret; |
235 | ||
89a5c985 UH |
236 | pcdev->pclk = clk_get(&pcdev->dev, "apb_pclk"); |
237 | if (IS_ERR(pcdev->pclk)) | |
238 | return PTR_ERR(pcdev->pclk); | |
7cfe2494 | 239 | |
89a5c985 UH |
240 | ret = clk_prepare_enable(pcdev->pclk); |
241 | if (ret) | |
242 | clk_put(pcdev->pclk); | |
7cfe2494 RK |
243 | |
244 | return ret; | |
245 | } | |
246 | ||
247 | static void amba_put_disable_pclk(struct amba_device *pcdev) | |
248 | { | |
89a5c985 UH |
249 | clk_disable_unprepare(pcdev->pclk); |
250 | clk_put(pcdev->pclk); | |
7cfe2494 RK |
251 | } |
252 | ||
1da177e4 LT |
253 | /* |
254 | * These are the device model conversion veneers; they convert the | |
255 | * device model structures to our more specific structures. | |
256 | */ | |
257 | static int amba_probe(struct device *dev) | |
258 | { | |
259 | struct amba_device *pcdev = to_amba_device(dev); | |
260 | struct amba_driver *pcdrv = to_amba_driver(dev->driver); | |
c862aab0 | 261 | const struct amba_id *id = amba_lookup(pcdrv->id_table, pcdev); |
7cfe2494 | 262 | int ret; |
1da177e4 | 263 | |
7cfe2494 | 264 | do { |
bcd3006f SB |
265 | ret = of_clk_set_defaults(dev->of_node, false); |
266 | if (ret < 0) | |
267 | break; | |
268 | ||
207f1a2d | 269 | ret = dev_pm_domain_attach(dev, true); |
d21bc89e | 270 | if (ret) |
207f1a2d UH |
271 | break; |
272 | ||
7cfe2494 | 273 | ret = amba_get_enable_pclk(pcdev); |
207f1a2d UH |
274 | if (ret) { |
275 | dev_pm_domain_detach(dev, true); | |
7cfe2494 | 276 | break; |
207f1a2d | 277 | } |
7cfe2494 | 278 | |
92b97f0a RK |
279 | pm_runtime_get_noresume(dev); |
280 | pm_runtime_set_active(dev); | |
281 | pm_runtime_enable(dev); | |
282 | ||
7cfe2494 RK |
283 | ret = pcdrv->probe(pcdev, id); |
284 | if (ret == 0) | |
285 | break; | |
1da177e4 | 286 | |
92b97f0a RK |
287 | pm_runtime_disable(dev); |
288 | pm_runtime_set_suspended(dev); | |
289 | pm_runtime_put_noidle(dev); | |
290 | ||
7cfe2494 | 291 | amba_put_disable_pclk(pcdev); |
207f1a2d | 292 | dev_pm_domain_detach(dev, true); |
7cfe2494 RK |
293 | } while (0); |
294 | ||
295 | return ret; | |
1da177e4 LT |
296 | } |
297 | ||
298 | static int amba_remove(struct device *dev) | |
299 | { | |
7cfe2494 | 300 | struct amba_device *pcdev = to_amba_device(dev); |
1da177e4 | 301 | struct amba_driver *drv = to_amba_driver(dev->driver); |
92b97f0a RK |
302 | int ret; |
303 | ||
304 | pm_runtime_get_sync(dev); | |
305 | ret = drv->remove(pcdev); | |
306 | pm_runtime_put_noidle(dev); | |
307 | ||
308 | /* Undo the runtime PM settings in amba_probe() */ | |
309 | pm_runtime_disable(dev); | |
310 | pm_runtime_set_suspended(dev); | |
311 | pm_runtime_put_noidle(dev); | |
7cfe2494 RK |
312 | |
313 | amba_put_disable_pclk(pcdev); | |
207f1a2d | 314 | dev_pm_domain_detach(dev, true); |
7cfe2494 RK |
315 | |
316 | return ret; | |
1da177e4 LT |
317 | } |
318 | ||
319 | static void amba_shutdown(struct device *dev) | |
320 | { | |
321 | struct amba_driver *drv = to_amba_driver(dev->driver); | |
322 | drv->shutdown(to_amba_device(dev)); | |
323 | } | |
324 | ||
325 | /** | |
326 | * amba_driver_register - register an AMBA device driver | |
327 | * @drv: amba device driver structure | |
328 | * | |
329 | * Register an AMBA device driver with the Linux device model | |
330 | * core. If devices pre-exist, the drivers probe function will | |
331 | * be called. | |
332 | */ | |
333 | int amba_driver_register(struct amba_driver *drv) | |
334 | { | |
335 | drv->drv.bus = &amba_bustype; | |
336 | ||
337 | #define SETFN(fn) if (drv->fn) drv->drv.fn = amba_##fn | |
338 | SETFN(probe); | |
339 | SETFN(remove); | |
340 | SETFN(shutdown); | |
341 | ||
342 | return driver_register(&drv->drv); | |
343 | } | |
344 | ||
345 | /** | |
346 | * amba_driver_unregister - remove an AMBA device driver | |
347 | * @drv: AMBA device driver structure to remove | |
348 | * | |
349 | * Unregister an AMBA device driver from the Linux device | |
350 | * model. The device model will call the drivers remove function | |
351 | * for each device the device driver is currently handling. | |
352 | */ | |
353 | void amba_driver_unregister(struct amba_driver *drv) | |
354 | { | |
355 | driver_unregister(&drv->drv); | |
356 | } | |
357 | ||
358 | ||
359 | static void amba_device_release(struct device *dev) | |
360 | { | |
361 | struct amba_device *d = to_amba_device(dev); | |
362 | ||
363 | if (d->res.parent) | |
364 | release_resource(&d->res); | |
365 | kfree(d); | |
366 | } | |
367 | ||
a41980f2 | 368 | static int amba_device_try_add(struct amba_device *dev, struct resource *parent) |
1da177e4 | 369 | { |
8afe0b96 | 370 | u32 size; |
1da177e4 LT |
371 | void __iomem *tmp; |
372 | int i, ret; | |
373 | ||
2eac58d5 RK |
374 | WARN_ON(dev->irq[0] == (unsigned int)-1); |
375 | WARN_ON(dev->irq[1] == (unsigned int)-1); | |
376 | ||
1da177e4 | 377 | ret = request_resource(parent, &dev->res); |
96b13f5c RK |
378 | if (ret) |
379 | goto err_out; | |
380 | ||
97ceed1f LW |
381 | /* Hard-coded primecell ID instead of plug-n-play */ |
382 | if (dev->periphid != 0) | |
383 | goto skip_probe; | |
384 | ||
8afe0b96 LC |
385 | /* |
386 | * Dynamically calculate the size of the resource | |
387 | * and use this for iomap | |
388 | */ | |
389 | size = resource_size(&dev->res); | |
390 | tmp = ioremap(dev->res.start, size); | |
96b13f5c RK |
391 | if (!tmp) { |
392 | ret = -ENOMEM; | |
393 | goto err_release; | |
1da177e4 | 394 | } |
96b13f5c | 395 | |
a41980f2 | 396 | ret = dev_pm_domain_attach(&dev->dev, true); |
d21bc89e | 397 | if (ret) { |
a41980f2 MS |
398 | iounmap(tmp); |
399 | goto err_release; | |
400 | } | |
401 | ||
7cfe2494 RK |
402 | ret = amba_get_enable_pclk(dev); |
403 | if (ret == 0) { | |
404 | u32 pid, cid; | |
79bdcb20 DN |
405 | struct reset_control *rstc; |
406 | ||
407 | /* | |
408 | * Find reset control(s) of the amba bus and de-assert them. | |
409 | */ | |
410 | rstc = of_reset_control_array_get_optional_shared(dev->dev.of_node); | |
411 | if (IS_ERR(rstc)) { | |
e963408e RK |
412 | ret = PTR_ERR(rstc); |
413 | if (ret != -EPROBE_DEFER) | |
414 | dev_err(&dev->dev, "can't get reset: %d\n", | |
415 | ret); | |
416 | goto err_reset; | |
79bdcb20 DN |
417 | } |
418 | reset_control_deassert(rstc); | |
419 | reset_control_put(rstc); | |
96b13f5c | 420 | |
7cfe2494 RK |
421 | /* |
422 | * Read pid and cid based on size of resource | |
423 | * they are located at end of region | |
424 | */ | |
425 | for (pid = 0, i = 0; i < 4; i++) | |
426 | pid |= (readl(tmp + size - 0x20 + 4 * i) & 255) << | |
427 | (i * 8); | |
428 | for (cid = 0, i = 0; i < 4; i++) | |
429 | cid |= (readl(tmp + size - 0x10 + 4 * i) & 255) << | |
430 | (i * 8); | |
96b13f5c | 431 | |
4a2910fa ML |
432 | if (cid == CORESIGHT_CID) { |
433 | /* set the base to the start of the last 4k block */ | |
434 | void __iomem *csbase = tmp + size - 4096; | |
435 | ||
436 | dev->uci.devarch = | |
437 | readl(csbase + UCI_REG_DEVARCH_OFFSET); | |
438 | dev->uci.devtype = | |
439 | readl(csbase + UCI_REG_DEVTYPE_OFFSET) & 0xff; | |
440 | } | |
441 | ||
7cfe2494 | 442 | amba_put_disable_pclk(dev); |
96b13f5c | 443 | |
4a2910fa | 444 | if (cid == AMBA_CID || cid == CORESIGHT_CID) { |
7cfe2494 | 445 | dev->periphid = pid; |
4a2910fa ML |
446 | dev->cid = cid; |
447 | } | |
7cfe2494 RK |
448 | |
449 | if (!dev->periphid) | |
450 | ret = -ENODEV; | |
96b13f5c RK |
451 | } |
452 | ||
7cfe2494 | 453 | iounmap(tmp); |
a41980f2 | 454 | dev_pm_domain_detach(&dev->dev, true); |
7cfe2494 RK |
455 | |
456 | if (ret) | |
457 | goto err_release; | |
458 | ||
97ceed1f | 459 | skip_probe: |
557dca5f | 460 | ret = device_add(&dev->dev); |
96b13f5c RK |
461 | if (ret) |
462 | goto err_release; | |
463 | ||
dfb85185 | 464 | if (dev->irq[0]) |
96b13f5c | 465 | ret = device_create_file(&dev->dev, &dev_attr_irq0); |
dfb85185 | 466 | if (ret == 0 && dev->irq[1]) |
96b13f5c RK |
467 | ret = device_create_file(&dev->dev, &dev_attr_irq1); |
468 | if (ret == 0) | |
469 | return ret; | |
470 | ||
471 | device_unregister(&dev->dev); | |
472 | ||
473 | err_release: | |
474 | release_resource(&dev->res); | |
475 | err_out: | |
1da177e4 | 476 | return ret; |
e963408e RK |
477 | |
478 | err_reset: | |
479 | amba_put_disable_pclk(dev); | |
480 | iounmap(tmp); | |
481 | dev_pm_domain_detach(&dev->dev, true); | |
482 | goto err_release; | |
1da177e4 | 483 | } |
a41980f2 MS |
484 | |
485 | /* | |
486 | * Registration of AMBA device require reading its pid and cid registers. | |
487 | * To do this, the device must be turned on (if it is a part of power domain) | |
488 | * and have clocks enabled. However in some cases those resources might not be | |
489 | * yet available. Returning EPROBE_DEFER is not a solution in such case, | |
490 | * because callers don't handle this special error code. Instead such devices | |
491 | * are added to the special list and their registration is retried from | |
492 | * periodic worker, until all resources are available and registration succeeds. | |
493 | */ | |
494 | struct deferred_device { | |
495 | struct amba_device *dev; | |
496 | struct resource *parent; | |
497 | struct list_head node; | |
498 | }; | |
499 | ||
500 | static LIST_HEAD(deferred_devices); | |
501 | static DEFINE_MUTEX(deferred_devices_lock); | |
502 | ||
503 | static void amba_deferred_retry_func(struct work_struct *dummy); | |
504 | static DECLARE_DELAYED_WORK(deferred_retry_work, amba_deferred_retry_func); | |
505 | ||
506 | #define DEFERRED_DEVICE_TIMEOUT (msecs_to_jiffies(5 * 1000)) | |
507 | ||
508 | static void amba_deferred_retry_func(struct work_struct *dummy) | |
509 | { | |
510 | struct deferred_device *ddev, *tmp; | |
511 | ||
512 | mutex_lock(&deferred_devices_lock); | |
513 | ||
514 | list_for_each_entry_safe(ddev, tmp, &deferred_devices, node) { | |
515 | int ret = amba_device_try_add(ddev->dev, ddev->parent); | |
516 | ||
517 | if (ret == -EPROBE_DEFER) | |
518 | continue; | |
519 | ||
520 | list_del_init(&ddev->node); | |
521 | kfree(ddev); | |
522 | } | |
523 | ||
524 | if (!list_empty(&deferred_devices)) | |
525 | schedule_delayed_work(&deferred_retry_work, | |
526 | DEFERRED_DEVICE_TIMEOUT); | |
527 | ||
528 | mutex_unlock(&deferred_devices_lock); | |
529 | } | |
530 | ||
531 | /** | |
532 | * amba_device_add - add a previously allocated AMBA device structure | |
533 | * @dev: AMBA device allocated by amba_device_alloc | |
534 | * @parent: resource parent for this devices resources | |
535 | * | |
536 | * Claim the resource, and read the device cell ID if not already | |
537 | * initialized. Register the AMBA device with the Linux device | |
538 | * manager. | |
539 | */ | |
540 | int amba_device_add(struct amba_device *dev, struct resource *parent) | |
541 | { | |
542 | int ret = amba_device_try_add(dev, parent); | |
543 | ||
544 | if (ret == -EPROBE_DEFER) { | |
545 | struct deferred_device *ddev; | |
546 | ||
547 | ddev = kmalloc(sizeof(*ddev), GFP_KERNEL); | |
548 | if (!ddev) | |
549 | return -ENOMEM; | |
550 | ||
551 | ddev->dev = dev; | |
552 | ddev->parent = parent; | |
553 | ret = 0; | |
554 | ||
555 | mutex_lock(&deferred_devices_lock); | |
556 | ||
557 | if (list_empty(&deferred_devices)) | |
558 | schedule_delayed_work(&deferred_retry_work, | |
559 | DEFERRED_DEVICE_TIMEOUT); | |
560 | list_add_tail(&ddev->node, &deferred_devices); | |
561 | ||
562 | mutex_unlock(&deferred_devices_lock); | |
563 | } | |
564 | return ret; | |
565 | } | |
d5dc9271 RK |
566 | EXPORT_SYMBOL_GPL(amba_device_add); |
567 | ||
6026aa90 LW |
568 | static struct amba_device * |
569 | amba_aphb_device_add(struct device *parent, const char *name, | |
570 | resource_size_t base, size_t size, int irq1, int irq2, | |
3ad909bc LW |
571 | void *pdata, unsigned int periphid, u64 dma_mask, |
572 | struct resource *resbase) | |
6026aa90 LW |
573 | { |
574 | struct amba_device *dev; | |
575 | int ret; | |
576 | ||
577 | dev = amba_device_alloc(name, base, size); | |
578 | if (!dev) | |
579 | return ERR_PTR(-ENOMEM); | |
580 | ||
6026aa90 LW |
581 | dev->dev.coherent_dma_mask = dma_mask; |
582 | dev->irq[0] = irq1; | |
583 | dev->irq[1] = irq2; | |
584 | dev->periphid = periphid; | |
585 | dev->dev.platform_data = pdata; | |
586 | dev->dev.parent = parent; | |
587 | ||
3ad909bc | 588 | ret = amba_device_add(dev, resbase); |
6026aa90 LW |
589 | if (ret) { |
590 | amba_device_put(dev); | |
591 | return ERR_PTR(ret); | |
592 | } | |
593 | ||
594 | return dev; | |
595 | } | |
596 | ||
597 | struct amba_device * | |
598 | amba_apb_device_add(struct device *parent, const char *name, | |
599 | resource_size_t base, size_t size, int irq1, int irq2, | |
600 | void *pdata, unsigned int periphid) | |
601 | { | |
602 | return amba_aphb_device_add(parent, name, base, size, irq1, irq2, pdata, | |
3ad909bc | 603 | periphid, 0, &iomem_resource); |
6026aa90 LW |
604 | } |
605 | EXPORT_SYMBOL_GPL(amba_apb_device_add); | |
606 | ||
607 | struct amba_device * | |
608 | amba_ahb_device_add(struct device *parent, const char *name, | |
609 | resource_size_t base, size_t size, int irq1, int irq2, | |
610 | void *pdata, unsigned int periphid) | |
611 | { | |
612 | return amba_aphb_device_add(parent, name, base, size, irq1, irq2, pdata, | |
3ad909bc | 613 | periphid, ~0ULL, &iomem_resource); |
6026aa90 LW |
614 | } |
615 | EXPORT_SYMBOL_GPL(amba_ahb_device_add); | |
616 | ||
3ad909bc LW |
617 | struct amba_device * |
618 | amba_apb_device_add_res(struct device *parent, const char *name, | |
619 | resource_size_t base, size_t size, int irq1, | |
620 | int irq2, void *pdata, unsigned int periphid, | |
621 | struct resource *resbase) | |
622 | { | |
623 | return amba_aphb_device_add(parent, name, base, size, irq1, irq2, pdata, | |
624 | periphid, 0, resbase); | |
625 | } | |
626 | EXPORT_SYMBOL_GPL(amba_apb_device_add_res); | |
627 | ||
628 | struct amba_device * | |
629 | amba_ahb_device_add_res(struct device *parent, const char *name, | |
630 | resource_size_t base, size_t size, int irq1, | |
631 | int irq2, void *pdata, unsigned int periphid, | |
632 | struct resource *resbase) | |
633 | { | |
634 | return amba_aphb_device_add(parent, name, base, size, irq1, irq2, pdata, | |
635 | periphid, ~0ULL, resbase); | |
636 | } | |
637 | EXPORT_SYMBOL_GPL(amba_ahb_device_add_res); | |
638 | ||
639 | ||
d5dc9271 RK |
640 | static void amba_device_initialize(struct amba_device *dev, const char *name) |
641 | { | |
642 | device_initialize(&dev->dev); | |
643 | if (name) | |
644 | dev_set_name(&dev->dev, "%s", name); | |
645 | dev->dev.release = amba_device_release; | |
646 | dev->dev.bus = &amba_bustype; | |
446b2a93 | 647 | dev->dev.dma_mask = &dev->dev.coherent_dma_mask; |
f4584884 | 648 | dev->dev.dma_parms = &dev->dma_parms; |
d5dc9271 RK |
649 | dev->res.name = dev_name(&dev->dev); |
650 | } | |
651 | ||
652 | /** | |
653 | * amba_device_alloc - allocate an AMBA device | |
654 | * @name: sysfs name of the AMBA device | |
655 | * @base: base of AMBA device | |
656 | * @size: size of AMBA device | |
657 | * | |
658 | * Allocate and initialize an AMBA device structure. Returns %NULL | |
659 | * on failure. | |
660 | */ | |
661 | struct amba_device *amba_device_alloc(const char *name, resource_size_t base, | |
662 | size_t size) | |
663 | { | |
664 | struct amba_device *dev; | |
665 | ||
666 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
667 | if (dev) { | |
668 | amba_device_initialize(dev, name); | |
669 | dev->res.start = base; | |
670 | dev->res.end = base + size - 1; | |
671 | dev->res.flags = IORESOURCE_MEM; | |
672 | } | |
673 | ||
674 | return dev; | |
675 | } | |
676 | EXPORT_SYMBOL_GPL(amba_device_alloc); | |
677 | ||
678 | /** | |
679 | * amba_device_register - register an AMBA device | |
680 | * @dev: AMBA device to register | |
681 | * @parent: parent memory resource | |
682 | * | |
683 | * Setup the AMBA device, reading the cell ID if present. | |
684 | * Claim the resource, and register the AMBA device with | |
685 | * the Linux device manager. | |
686 | */ | |
687 | int amba_device_register(struct amba_device *dev, struct resource *parent) | |
688 | { | |
689 | amba_device_initialize(dev, dev->dev.init_name); | |
690 | dev->dev.init_name = NULL; | |
691 | ||
d5dc9271 RK |
692 | return amba_device_add(dev, parent); |
693 | } | |
694 | ||
695 | /** | |
696 | * amba_device_put - put an AMBA device | |
697 | * @dev: AMBA device to put | |
698 | */ | |
699 | void amba_device_put(struct amba_device *dev) | |
700 | { | |
701 | put_device(&dev->dev); | |
702 | } | |
703 | EXPORT_SYMBOL_GPL(amba_device_put); | |
1da177e4 LT |
704 | |
705 | /** | |
706 | * amba_device_unregister - unregister an AMBA device | |
707 | * @dev: AMBA device to remove | |
708 | * | |
709 | * Remove the specified AMBA device from the Linux device | |
710 | * manager. All files associated with this object will be | |
711 | * destroyed, and device drivers notified that the device has | |
712 | * been removed. The AMBA device's resources including | |
713 | * the amba_device structure will be freed once all | |
714 | * references to it have been dropped. | |
715 | */ | |
716 | void amba_device_unregister(struct amba_device *dev) | |
717 | { | |
718 | device_unregister(&dev->dev); | |
719 | } | |
720 | ||
721 | ||
722 | struct find_data { | |
723 | struct amba_device *dev; | |
724 | struct device *parent; | |
725 | const char *busid; | |
726 | unsigned int id; | |
727 | unsigned int mask; | |
728 | }; | |
729 | ||
730 | static int amba_find_match(struct device *dev, void *data) | |
731 | { | |
732 | struct find_data *d = data; | |
733 | struct amba_device *pcdev = to_amba_device(dev); | |
734 | int r; | |
735 | ||
736 | r = (pcdev->periphid & d->mask) == d->id; | |
737 | if (d->parent) | |
738 | r &= d->parent == dev->parent; | |
739 | if (d->busid) | |
9d6b4c82 | 740 | r &= strcmp(dev_name(dev), d->busid) == 0; |
1da177e4 LT |
741 | |
742 | if (r) { | |
743 | get_device(dev); | |
744 | d->dev = pcdev; | |
745 | } | |
746 | ||
747 | return r; | |
748 | } | |
749 | ||
750 | /** | |
751 | * amba_find_device - locate an AMBA device given a bus id | |
752 | * @busid: bus id for device (or NULL) | |
753 | * @parent: parent device (or NULL) | |
754 | * @id: peripheral ID (or 0) | |
755 | * @mask: peripheral ID mask (or 0) | |
756 | * | |
757 | * Return the AMBA device corresponding to the supplied parameters. | |
758 | * If no device matches, returns NULL. | |
759 | * | |
760 | * NOTE: When a valid device is found, its refcount is | |
761 | * incremented, and must be decremented before the returned | |
762 | * reference. | |
763 | */ | |
764 | struct amba_device * | |
765 | amba_find_device(const char *busid, struct device *parent, unsigned int id, | |
766 | unsigned int mask) | |
767 | { | |
768 | struct find_data data; | |
769 | ||
770 | data.dev = NULL; | |
771 | data.parent = parent; | |
772 | data.busid = busid; | |
773 | data.id = id; | |
774 | data.mask = mask; | |
775 | ||
776 | bus_for_each_dev(&amba_bustype, NULL, &data, amba_find_match); | |
777 | ||
778 | return data.dev; | |
779 | } | |
780 | ||
781 | /** | |
782 | * amba_request_regions - request all mem regions associated with device | |
783 | * @dev: amba_device structure for device | |
784 | * @name: name, or NULL to use driver name | |
785 | */ | |
786 | int amba_request_regions(struct amba_device *dev, const char *name) | |
787 | { | |
788 | int ret = 0; | |
8afe0b96 | 789 | u32 size; |
1da177e4 LT |
790 | |
791 | if (!name) | |
792 | name = dev->dev.driver->name; | |
793 | ||
8afe0b96 LC |
794 | size = resource_size(&dev->res); |
795 | ||
796 | if (!request_mem_region(dev->res.start, size, name)) | |
1da177e4 LT |
797 | ret = -EBUSY; |
798 | ||
799 | return ret; | |
800 | } | |
801 | ||
802 | /** | |
25985edc | 803 | * amba_release_regions - release mem regions associated with device |
1da177e4 LT |
804 | * @dev: amba_device structure for device |
805 | * | |
806 | * Release regions claimed by a successful call to amba_request_regions. | |
807 | */ | |
808 | void amba_release_regions(struct amba_device *dev) | |
809 | { | |
8afe0b96 LC |
810 | u32 size; |
811 | ||
812 | size = resource_size(&dev->res); | |
813 | release_mem_region(dev->res.start, size); | |
1da177e4 LT |
814 | } |
815 | ||
816 | EXPORT_SYMBOL(amba_driver_register); | |
817 | EXPORT_SYMBOL(amba_driver_unregister); | |
818 | EXPORT_SYMBOL(amba_device_register); | |
819 | EXPORT_SYMBOL(amba_device_unregister); | |
820 | EXPORT_SYMBOL(amba_find_device); | |
821 | EXPORT_SYMBOL(amba_request_regions); | |
822 | EXPORT_SYMBOL(amba_release_regions); |