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> |
854f695c | 22 | #include <linux/of_irq.h> |
4a6d9dd5 LB |
23 | #include <linux/of_device.h> |
24 | #include <linux/acpi.h> | |
512881ea LB |
25 | #include <linux/iommu.h> |
26 | #include <linux/dma-map-ops.h> | |
1da177e4 | 27 | |
1da177e4 LT |
28 | #define to_amba_driver(d) container_of(d, struct amba_driver, drv) |
29 | ||
4a2910fa ML |
30 | /* called on periphid match and class 0x9 coresight device. */ |
31 | static int | |
32 | amba_cs_uci_id_match(const struct amba_id *table, struct amba_device *dev) | |
1da177e4 LT |
33 | { |
34 | int ret = 0; | |
4a2910fa ML |
35 | struct amba_cs_uci_id *uci; |
36 | ||
37 | uci = table->data; | |
1da177e4 | 38 | |
4a2910fa ML |
39 | /* no table data or zero mask - return match on periphid */ |
40 | if (!uci || (uci->devarch_mask == 0)) | |
41 | return 1; | |
42 | ||
43 | /* test against read devtype and masked devarch value */ | |
44 | ret = (dev->uci.devtype == uci->devtype) && | |
45 | ((dev->uci.devarch & uci->devarch_mask) == uci->devarch); | |
46 | return ret; | |
47 | } | |
48 | ||
49 | static const struct amba_id * | |
50 | amba_lookup(const struct amba_id *table, struct amba_device *dev) | |
51 | { | |
1da177e4 | 52 | while (table->mask) { |
4a2910fa ML |
53 | if (((dev->periphid & table->mask) == table->id) && |
54 | ((dev->cid != CORESIGHT_CID) || | |
55 | (amba_cs_uci_id_match(table, dev)))) | |
56 | return table; | |
1da177e4 LT |
57 | table++; |
58 | } | |
4a2910fa | 59 | return NULL; |
1da177e4 LT |
60 | } |
61 | ||
5150a8f0 | 62 | static int amba_get_enable_pclk(struct amba_device *pcdev) |
1da177e4 | 63 | { |
5150a8f0 | 64 | int ret; |
1da177e4 | 65 | |
5150a8f0 UKK |
66 | pcdev->pclk = clk_get(&pcdev->dev, "apb_pclk"); |
67 | if (IS_ERR(pcdev->pclk)) | |
68 | return PTR_ERR(pcdev->pclk); | |
3cf38571 | 69 | |
5150a8f0 UKK |
70 | ret = clk_prepare_enable(pcdev->pclk); |
71 | if (ret) | |
72 | clk_put(pcdev->pclk); | |
73 | ||
74 | return ret; | |
1da177e4 LT |
75 | } |
76 | ||
5150a8f0 | 77 | static void amba_put_disable_pclk(struct amba_device *pcdev) |
1da177e4 | 78 | { |
5150a8f0 UKK |
79 | clk_disable_unprepare(pcdev->pclk); |
80 | clk_put(pcdev->pclk); | |
1da177e4 | 81 | } |
1da177e4 | 82 | |
5150a8f0 | 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); | |
6e679550 | 101 | int ret; |
3cf38571 | 102 | |
6e679550 KK |
103 | ret = driver_set_override(_dev, &dev->driver_override, buf, count); |
104 | if (ret) | |
105 | return ret; | |
3cf38571 AM |
106 | |
107 | return count; | |
108 | } | |
966449a3 | 109 | static DEVICE_ATTR_RW(driver_override); |
3cf38571 | 110 | |
96b13f5c RK |
111 | #define amba_attr_func(name,fmt,arg...) \ |
112 | static ssize_t name##_show(struct device *_dev, \ | |
113 | struct device_attribute *attr, char *buf) \ | |
114 | { \ | |
115 | struct amba_device *dev = to_amba_device(_dev); \ | |
116 | return sprintf(buf, fmt, arg); \ | |
966449a3 GKH |
117 | } \ |
118 | static DEVICE_ATTR_RO(name) | |
96b13f5c RK |
119 | |
120 | amba_attr_func(id, "%08x\n", dev->periphid); | |
96b13f5c RK |
121 | amba_attr_func(resource, "\t%016llx\t%016llx\t%016lx\n", |
122 | (unsigned long long)dev->res.start, (unsigned long long)dev->res.end, | |
123 | dev->res.flags); | |
124 | ||
966449a3 GKH |
125 | static struct attribute *amba_dev_attrs[] = { |
126 | &dev_attr_id.attr, | |
127 | &dev_attr_resource.attr, | |
128 | &dev_attr_driver_override.attr, | |
129 | NULL, | |
96b13f5c | 130 | }; |
966449a3 | 131 | ATTRIBUTE_GROUPS(amba_dev); |
96b13f5c | 132 | |
f2d3b9a4 SK |
133 | static int amba_read_periphid(struct amba_device *dev) |
134 | { | |
135 | struct reset_control *rstc; | |
136 | u32 size, pid, cid; | |
137 | void __iomem *tmp; | |
138 | int i, ret; | |
139 | ||
140 | ret = dev_pm_domain_attach(&dev->dev, true); | |
141 | if (ret) { | |
142 | dev_dbg(&dev->dev, "can't get PM domain: %d\n", ret); | |
143 | goto err_out; | |
144 | } | |
145 | ||
146 | ret = amba_get_enable_pclk(dev); | |
147 | if (ret) { | |
148 | dev_dbg(&dev->dev, "can't get pclk: %d\n", ret); | |
149 | goto err_pm; | |
150 | } | |
151 | ||
152 | /* | |
153 | * Find reset control(s) of the amba bus and de-assert them. | |
154 | */ | |
155 | rstc = of_reset_control_array_get_optional_shared(dev->dev.of_node); | |
156 | if (IS_ERR(rstc)) { | |
157 | ret = PTR_ERR(rstc); | |
158 | if (ret != -EPROBE_DEFER) | |
159 | dev_err(&dev->dev, "can't get reset: %d\n", ret); | |
160 | goto err_clk; | |
161 | } | |
162 | reset_control_deassert(rstc); | |
163 | reset_control_put(rstc); | |
164 | ||
165 | size = resource_size(&dev->res); | |
166 | tmp = ioremap(dev->res.start, size); | |
167 | if (!tmp) { | |
168 | ret = -ENOMEM; | |
169 | goto err_clk; | |
170 | } | |
171 | ||
172 | /* | |
173 | * Read pid and cid based on size of resource | |
174 | * they are located at end of region | |
175 | */ | |
176 | for (pid = 0, i = 0; i < 4; i++) | |
177 | pid |= (readl(tmp + size - 0x20 + 4 * i) & 255) << (i * 8); | |
178 | for (cid = 0, i = 0; i < 4; i++) | |
179 | cid |= (readl(tmp + size - 0x10 + 4 * i) & 255) << (i * 8); | |
180 | ||
181 | if (cid == CORESIGHT_CID) { | |
182 | /* set the base to the start of the last 4k block */ | |
183 | void __iomem *csbase = tmp + size - 4096; | |
184 | ||
185 | dev->uci.devarch = readl(csbase + UCI_REG_DEVARCH_OFFSET); | |
186 | dev->uci.devtype = readl(csbase + UCI_REG_DEVTYPE_OFFSET) & 0xff; | |
187 | } | |
188 | ||
189 | if (cid == AMBA_CID || cid == CORESIGHT_CID) { | |
190 | dev->periphid = pid; | |
191 | dev->cid = cid; | |
192 | } | |
193 | ||
194 | if (!dev->periphid) | |
195 | ret = -ENODEV; | |
196 | ||
197 | iounmap(tmp); | |
198 | ||
199 | err_clk: | |
200 | amba_put_disable_pclk(dev); | |
201 | err_pm: | |
202 | dev_pm_domain_detach(&dev->dev, true); | |
203 | err_out: | |
204 | return ret; | |
205 | } | |
206 | ||
5150a8f0 UKK |
207 | static int amba_match(struct device *dev, struct device_driver *drv) |
208 | { | |
209 | struct amba_device *pcdev = to_amba_device(dev); | |
210 | struct amba_driver *pcdrv = to_amba_driver(drv); | |
211 | ||
25af7406 | 212 | mutex_lock(&pcdev->periphid_lock); |
f2d3b9a4 SK |
213 | if (!pcdev->periphid) { |
214 | int ret = amba_read_periphid(pcdev); | |
215 | ||
216 | /* | |
217 | * Returning any error other than -EPROBE_DEFER from bus match | |
218 | * can cause driver registration failure. So, if there's a | |
219 | * permanent failure in reading pid and cid, simply map it to | |
220 | * -EPROBE_DEFER. | |
221 | */ | |
25af7406 IM |
222 | if (ret) { |
223 | mutex_unlock(&pcdev->periphid_lock); | |
f2d3b9a4 | 224 | return -EPROBE_DEFER; |
25af7406 | 225 | } |
f2d3b9a4 SK |
226 | dev_set_uevent_suppress(dev, false); |
227 | kobject_uevent(&dev->kobj, KOBJ_ADD); | |
228 | } | |
25af7406 | 229 | mutex_unlock(&pcdev->periphid_lock); |
f2d3b9a4 | 230 | |
5150a8f0 UKK |
231 | /* When driver_override is set, only bind to the matching driver */ |
232 | if (pcdev->driver_override) | |
233 | return !strcmp(pcdev->driver_override, drv->name); | |
234 | ||
235 | return amba_lookup(pcdrv->id_table, pcdev) != NULL; | |
236 | } | |
237 | ||
238 | static int amba_uevent(struct device *dev, struct kobj_uevent_env *env) | |
239 | { | |
240 | struct amba_device *pcdev = to_amba_device(dev); | |
241 | int retval = 0; | |
242 | ||
243 | retval = add_uevent_var(env, "AMBA_ID=%08x", pcdev->periphid); | |
244 | if (retval) | |
245 | return retval; | |
246 | ||
247 | retval = add_uevent_var(env, "MODALIAS=amba:d%08X", pcdev->periphid); | |
248 | return retval; | |
249 | } | |
250 | ||
dcc0a8f6 WK |
251 | static int of_amba_device_decode_irq(struct amba_device *dev) |
252 | { | |
253 | struct device_node *node = dev->dev.of_node; | |
254 | int i, irq = 0; | |
255 | ||
256 | if (IS_ENABLED(CONFIG_OF_IRQ) && node) { | |
257 | /* Decode the IRQs and address ranges */ | |
258 | for (i = 0; i < AMBA_NR_IRQS; i++) { | |
259 | irq = of_irq_get(node, i); | |
260 | if (irq < 0) { | |
261 | if (irq == -EPROBE_DEFER) | |
262 | return irq; | |
263 | irq = 0; | |
264 | } | |
265 | ||
266 | dev->irq[i] = irq; | |
267 | } | |
268 | } | |
269 | ||
270 | return 0; | |
271 | } | |
272 | ||
f170b59f UKK |
273 | /* |
274 | * These are the device model conversion veneers; they convert the | |
275 | * device model structures to our more specific structures. | |
276 | */ | |
277 | static int amba_probe(struct device *dev) | |
278 | { | |
279 | struct amba_device *pcdev = to_amba_device(dev); | |
280 | struct amba_driver *pcdrv = to_amba_driver(dev->driver); | |
281 | const struct amba_id *id = amba_lookup(pcdrv->id_table, pcdev); | |
282 | int ret; | |
283 | ||
284 | do { | |
dcc0a8f6 WK |
285 | ret = of_amba_device_decode_irq(pcdev); |
286 | if (ret) | |
287 | break; | |
288 | ||
f170b59f UKK |
289 | ret = of_clk_set_defaults(dev->of_node, false); |
290 | if (ret < 0) | |
291 | break; | |
292 | ||
293 | ret = dev_pm_domain_attach(dev, true); | |
294 | if (ret) | |
295 | break; | |
296 | ||
297 | ret = amba_get_enable_pclk(pcdev); | |
298 | if (ret) { | |
299 | dev_pm_domain_detach(dev, true); | |
300 | break; | |
301 | } | |
302 | ||
303 | pm_runtime_get_noresume(dev); | |
304 | pm_runtime_set_active(dev); | |
305 | pm_runtime_enable(dev); | |
306 | ||
307 | ret = pcdrv->probe(pcdev, id); | |
308 | if (ret == 0) | |
309 | break; | |
310 | ||
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 | } while (0); | |
318 | ||
319 | return ret; | |
320 | } | |
321 | ||
fc7a6209 | 322 | static void amba_remove(struct device *dev) |
f170b59f UKK |
323 | { |
324 | struct amba_device *pcdev = to_amba_device(dev); | |
325 | struct amba_driver *drv = to_amba_driver(dev->driver); | |
326 | ||
327 | pm_runtime_get_sync(dev); | |
328 | if (drv->remove) | |
329 | drv->remove(pcdev); | |
330 | pm_runtime_put_noidle(dev); | |
331 | ||
332 | /* Undo the runtime PM settings in amba_probe() */ | |
333 | pm_runtime_disable(dev); | |
334 | pm_runtime_set_suspended(dev); | |
335 | pm_runtime_put_noidle(dev); | |
336 | ||
337 | amba_put_disable_pclk(pcdev); | |
338 | dev_pm_domain_detach(dev, true); | |
f170b59f UKK |
339 | } |
340 | ||
341 | static void amba_shutdown(struct device *dev) | |
342 | { | |
343 | struct amba_driver *drv; | |
344 | ||
345 | if (!dev->driver) | |
346 | return; | |
347 | ||
348 | drv = to_amba_driver(dev->driver); | |
349 | if (drv->shutdown) | |
350 | drv->shutdown(to_amba_device(dev)); | |
351 | } | |
352 | ||
4a6d9dd5 LB |
353 | static int amba_dma_configure(struct device *dev) |
354 | { | |
512881ea | 355 | struct amba_driver *drv = to_amba_driver(dev->driver); |
4a6d9dd5 LB |
356 | enum dev_dma_attr attr; |
357 | int ret = 0; | |
358 | ||
359 | if (dev->of_node) { | |
360 | ret = of_dma_configure(dev, dev->of_node, true); | |
361 | } else if (has_acpi_companion(dev)) { | |
362 | attr = acpi_get_dma_attr(to_acpi_device_node(dev->fwnode)); | |
363 | ret = acpi_dma_configure(dev, attr); | |
364 | } | |
365 | ||
512881ea LB |
366 | if (!ret && !drv->driver_managed_dma) { |
367 | ret = iommu_device_use_default_domain(dev); | |
368 | if (ret) | |
369 | arch_teardown_dma_ops(dev); | |
370 | } | |
371 | ||
4a6d9dd5 LB |
372 | return ret; |
373 | } | |
374 | ||
512881ea LB |
375 | static void amba_dma_cleanup(struct device *dev) |
376 | { | |
377 | struct amba_driver *drv = to_amba_driver(dev->driver); | |
378 | ||
379 | if (!drv->driver_managed_dma) | |
380 | iommu_device_unuse_default_domain(dev); | |
381 | } | |
382 | ||
f210c53a | 383 | #ifdef CONFIG_PM |
92b97f0a RK |
384 | /* |
385 | * Hooks to provide runtime PM of the pclk (bus clock). It is safe to | |
386 | * enable/disable the bus clock at runtime PM suspend/resume as this | |
1e45860f | 387 | * does not result in loss of context. |
92b97f0a RK |
388 | */ |
389 | static int amba_pm_runtime_suspend(struct device *dev) | |
390 | { | |
391 | struct amba_device *pcdev = to_amba_device(dev); | |
392 | int ret = pm_generic_runtime_suspend(dev); | |
393 | ||
5670c2a5 KK |
394 | if (ret == 0 && dev->driver) { |
395 | if (pm_runtime_is_irq_safe(dev)) | |
396 | clk_disable(pcdev->pclk); | |
397 | else | |
398 | clk_disable_unprepare(pcdev->pclk); | |
399 | } | |
92b97f0a RK |
400 | |
401 | return ret; | |
402 | } | |
403 | ||
404 | static int amba_pm_runtime_resume(struct device *dev) | |
405 | { | |
406 | struct amba_device *pcdev = to_amba_device(dev); | |
407 | int ret; | |
408 | ||
409 | if (dev->driver) { | |
5670c2a5 KK |
410 | if (pm_runtime_is_irq_safe(dev)) |
411 | ret = clk_enable(pcdev->pclk); | |
412 | else | |
413 | ret = clk_prepare_enable(pcdev->pclk); | |
92b97f0a RK |
414 | /* Failure is probably fatal to the system, but... */ |
415 | if (ret) | |
416 | return ret; | |
417 | } | |
418 | ||
419 | return pm_generic_runtime_resume(dev); | |
420 | } | |
5670c2a5 | 421 | #endif /* CONFIG_PM */ |
92b97f0a | 422 | |
ba74ec7f | 423 | static const struct dev_pm_ops amba_pm = { |
6ed23b80 | 424 | SET_RUNTIME_PM_OPS( |
92b97f0a RK |
425 | amba_pm_runtime_suspend, |
426 | amba_pm_runtime_resume, | |
45f0a85c | 427 | NULL |
ba74ec7f RV |
428 | ) |
429 | }; | |
430 | ||
1da177e4 LT |
431 | /* |
432 | * Primecells are part of the Advanced Microcontroller Bus Architecture, | |
433 | * so we call the bus "amba". | |
07397df2 NG |
434 | * DMA configuration for platform and AMBA bus is same. So here we reuse |
435 | * platform's DMA config routine. | |
1da177e4 | 436 | */ |
394d5aef | 437 | struct bus_type amba_bustype = { |
1da177e4 | 438 | .name = "amba", |
966449a3 | 439 | .dev_groups = amba_dev_groups, |
1da177e4 | 440 | .match = amba_match, |
6d20b035 | 441 | .uevent = amba_uevent, |
f170b59f UKK |
442 | .probe = amba_probe, |
443 | .remove = amba_remove, | |
444 | .shutdown = amba_shutdown, | |
4a6d9dd5 | 445 | .dma_configure = amba_dma_configure, |
512881ea | 446 | .dma_cleanup = amba_dma_cleanup, |
26825cfd | 447 | .pm = &amba_pm, |
1da177e4 | 448 | }; |
e9ac68c3 | 449 | EXPORT_SYMBOL_GPL(amba_bustype); |
1da177e4 LT |
450 | |
451 | static int __init amba_init(void) | |
452 | { | |
453 | return bus_register(&amba_bustype); | |
454 | } | |
455 | ||
456 | postcore_initcall(amba_init); | |
457 | ||
f2d3b9a4 SK |
458 | static int amba_proxy_probe(struct amba_device *adev, |
459 | const struct amba_id *id) | |
460 | { | |
461 | WARN(1, "Stub driver should never match any device.\n"); | |
462 | return -ENODEV; | |
463 | } | |
464 | ||
465 | static const struct amba_id amba_stub_drv_ids[] = { | |
466 | { 0, 0 }, | |
467 | }; | |
468 | ||
469 | static struct amba_driver amba_proxy_drv = { | |
470 | .drv = { | |
471 | .name = "amba-proxy", | |
472 | }, | |
473 | .probe = amba_proxy_probe, | |
474 | .id_table = amba_stub_drv_ids, | |
475 | }; | |
476 | ||
477 | static int __init amba_stub_drv_init(void) | |
478 | { | |
479 | if (!IS_ENABLED(CONFIG_MODULES)) | |
480 | return 0; | |
481 | ||
482 | /* | |
483 | * The amba_match() function will get called only if there is at least | |
484 | * one amba driver registered. If all amba drivers are modules and are | |
485 | * only loaded based on uevents, then we'll hit a chicken-and-egg | |
486 | * situation where amba_match() is waiting on drivers and drivers are | |
487 | * waiting on amba_match(). So, register a stub driver to make sure | |
488 | * amba_match() is called even if no amba driver has been registered. | |
489 | */ | |
490 | return amba_driver_register(&amba_proxy_drv); | |
491 | } | |
492 | late_initcall_sync(amba_stub_drv_init); | |
493 | ||
1da177e4 LT |
494 | /** |
495 | * amba_driver_register - register an AMBA device driver | |
496 | * @drv: amba device driver structure | |
497 | * | |
498 | * Register an AMBA device driver with the Linux device model | |
499 | * core. If devices pre-exist, the drivers probe function will | |
500 | * be called. | |
501 | */ | |
502 | int amba_driver_register(struct amba_driver *drv) | |
503 | { | |
de5d7adb UKK |
504 | if (!drv->probe) |
505 | return -EINVAL; | |
1da177e4 | 506 | |
de5d7adb | 507 | drv->drv.bus = &amba_bustype; |
1da177e4 LT |
508 | |
509 | return driver_register(&drv->drv); | |
510 | } | |
a2e7ae86 | 511 | EXPORT_SYMBOL(amba_driver_register); |
1da177e4 LT |
512 | |
513 | /** | |
514 | * amba_driver_unregister - remove an AMBA device driver | |
515 | * @drv: AMBA device driver structure to remove | |
516 | * | |
517 | * Unregister an AMBA device driver from the Linux device | |
518 | * model. The device model will call the drivers remove function | |
519 | * for each device the device driver is currently handling. | |
520 | */ | |
521 | void amba_driver_unregister(struct amba_driver *drv) | |
522 | { | |
523 | driver_unregister(&drv->drv); | |
524 | } | |
a2e7ae86 | 525 | EXPORT_SYMBOL(amba_driver_unregister); |
1da177e4 LT |
526 | |
527 | static void amba_device_release(struct device *dev) | |
528 | { | |
529 | struct amba_device *d = to_amba_device(dev); | |
530 | ||
531 | if (d->res.parent) | |
532 | release_resource(&d->res); | |
25af7406 | 533 | mutex_destroy(&d->periphid_lock); |
1da177e4 LT |
534 | kfree(d); |
535 | } | |
536 | ||
a41980f2 MS |
537 | /** |
538 | * amba_device_add - add a previously allocated AMBA device structure | |
539 | * @dev: AMBA device allocated by amba_device_alloc | |
540 | * @parent: resource parent for this devices resources | |
541 | * | |
542 | * Claim the resource, and read the device cell ID if not already | |
543 | * initialized. Register the AMBA device with the Linux device | |
544 | * manager. | |
545 | */ | |
546 | int amba_device_add(struct amba_device *dev, struct resource *parent) | |
547 | { | |
f2d3b9a4 | 548 | int ret; |
a41980f2 | 549 | |
f2d3b9a4 SK |
550 | ret = request_resource(parent, &dev->res); |
551 | if (ret) | |
552 | return ret; | |
a41980f2 | 553 | |
f2d3b9a4 SK |
554 | /* If primecell ID isn't hard-coded, figure it out */ |
555 | if (!dev->periphid) { | |
556 | /* | |
557 | * AMBA device uevents require reading its pid and cid | |
558 | * registers. To do this, the device must be on, clocked and | |
559 | * out of reset. However in some cases those resources might | |
560 | * not yet be available. If that's the case, we suppress the | |
561 | * generation of uevents until we can read the pid and cid | |
562 | * registers. See also amba_match(). | |
563 | */ | |
564 | if (amba_read_periphid(dev)) | |
565 | dev_set_uevent_suppress(&dev->dev, true); | |
566 | } | |
a41980f2 | 567 | |
f2d3b9a4 SK |
568 | ret = device_add(&dev->dev); |
569 | if (ret) | |
570 | release_resource(&dev->res); | |
a41980f2 | 571 | |
a41980f2 MS |
572 | return ret; |
573 | } | |
d5dc9271 RK |
574 | EXPORT_SYMBOL_GPL(amba_device_add); |
575 | ||
576 | static void amba_device_initialize(struct amba_device *dev, const char *name) | |
577 | { | |
578 | device_initialize(&dev->dev); | |
579 | if (name) | |
580 | dev_set_name(&dev->dev, "%s", name); | |
581 | dev->dev.release = amba_device_release; | |
582 | dev->dev.bus = &amba_bustype; | |
446b2a93 | 583 | dev->dev.dma_mask = &dev->dev.coherent_dma_mask; |
f4584884 | 584 | dev->dev.dma_parms = &dev->dma_parms; |
d5dc9271 | 585 | dev->res.name = dev_name(&dev->dev); |
25af7406 | 586 | mutex_init(&dev->periphid_lock); |
d5dc9271 RK |
587 | } |
588 | ||
589 | /** | |
590 | * amba_device_alloc - allocate an AMBA device | |
591 | * @name: sysfs name of the AMBA device | |
592 | * @base: base of AMBA device | |
593 | * @size: size of AMBA device | |
594 | * | |
595 | * Allocate and initialize an AMBA device structure. Returns %NULL | |
596 | * on failure. | |
597 | */ | |
598 | struct amba_device *amba_device_alloc(const char *name, resource_size_t base, | |
599 | size_t size) | |
600 | { | |
601 | struct amba_device *dev; | |
602 | ||
603 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
604 | if (dev) { | |
605 | amba_device_initialize(dev, name); | |
606 | dev->res.start = base; | |
607 | dev->res.end = base + size - 1; | |
608 | dev->res.flags = IORESOURCE_MEM; | |
609 | } | |
610 | ||
611 | return dev; | |
612 | } | |
613 | EXPORT_SYMBOL_GPL(amba_device_alloc); | |
614 | ||
615 | /** | |
616 | * amba_device_register - register an AMBA device | |
617 | * @dev: AMBA device to register | |
618 | * @parent: parent memory resource | |
619 | * | |
620 | * Setup the AMBA device, reading the cell ID if present. | |
621 | * Claim the resource, and register the AMBA device with | |
622 | * the Linux device manager. | |
623 | */ | |
624 | int amba_device_register(struct amba_device *dev, struct resource *parent) | |
625 | { | |
626 | amba_device_initialize(dev, dev->dev.init_name); | |
627 | dev->dev.init_name = NULL; | |
628 | ||
d5dc9271 RK |
629 | return amba_device_add(dev, parent); |
630 | } | |
a2e7ae86 | 631 | EXPORT_SYMBOL(amba_device_register); |
d5dc9271 RK |
632 | |
633 | /** | |
634 | * amba_device_put - put an AMBA device | |
635 | * @dev: AMBA device to put | |
636 | */ | |
637 | void amba_device_put(struct amba_device *dev) | |
638 | { | |
639 | put_device(&dev->dev); | |
640 | } | |
641 | EXPORT_SYMBOL_GPL(amba_device_put); | |
1da177e4 LT |
642 | |
643 | /** | |
644 | * amba_device_unregister - unregister an AMBA device | |
645 | * @dev: AMBA device to remove | |
646 | * | |
647 | * Remove the specified AMBA device from the Linux device | |
648 | * manager. All files associated with this object will be | |
649 | * destroyed, and device drivers notified that the device has | |
650 | * been removed. The AMBA device's resources including | |
651 | * the amba_device structure will be freed once all | |
652 | * references to it have been dropped. | |
653 | */ | |
654 | void amba_device_unregister(struct amba_device *dev) | |
655 | { | |
656 | device_unregister(&dev->dev); | |
657 | } | |
a2e7ae86 | 658 | EXPORT_SYMBOL(amba_device_unregister); |
1da177e4 | 659 | |
1da177e4 LT |
660 | /** |
661 | * amba_request_regions - request all mem regions associated with device | |
662 | * @dev: amba_device structure for device | |
663 | * @name: name, or NULL to use driver name | |
664 | */ | |
665 | int amba_request_regions(struct amba_device *dev, const char *name) | |
666 | { | |
667 | int ret = 0; | |
8afe0b96 | 668 | u32 size; |
1da177e4 LT |
669 | |
670 | if (!name) | |
671 | name = dev->dev.driver->name; | |
672 | ||
8afe0b96 LC |
673 | size = resource_size(&dev->res); |
674 | ||
675 | if (!request_mem_region(dev->res.start, size, name)) | |
1da177e4 LT |
676 | ret = -EBUSY; |
677 | ||
678 | return ret; | |
679 | } | |
a2e7ae86 | 680 | EXPORT_SYMBOL(amba_request_regions); |
1da177e4 LT |
681 | |
682 | /** | |
25985edc | 683 | * amba_release_regions - release mem regions associated with device |
1da177e4 LT |
684 | * @dev: amba_device structure for device |
685 | * | |
686 | * Release regions claimed by a successful call to amba_request_regions. | |
687 | */ | |
688 | void amba_release_regions(struct amba_device *dev) | |
689 | { | |
8afe0b96 LC |
690 | u32 size; |
691 | ||
692 | size = resource_size(&dev->res); | |
693 | release_mem_region(dev->res.start, size); | |
1da177e4 | 694 | } |
1da177e4 | 695 | EXPORT_SYMBOL(amba_release_regions); |