Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/arch/arm/common/amba.c | |
3 | * | |
4 | * Copyright (C) 2003 Deep Blue Solutions Ltd, All Rights Reserved. | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | */ | |
10 | #include <linux/module.h> | |
11 | #include <linux/init.h> | |
12 | #include <linux/device.h> | |
4e57b681 TS |
13 | #include <linux/string.h> |
14 | #include <linux/slab.h> | |
934848da | 15 | #include <linux/io.h> |
a62c80e5 | 16 | #include <linux/amba/bus.h> |
1da177e4 | 17 | |
934848da | 18 | #include <asm/irq.h> |
1da177e4 LT |
19 | #include <asm/sizes.h> |
20 | ||
21 | #define to_amba_device(d) container_of(d, struct amba_device, dev) | |
22 | #define to_amba_driver(d) container_of(d, struct amba_driver, drv) | |
23 | ||
24 | static struct amba_id * | |
25 | amba_lookup(struct amba_id *table, struct amba_device *dev) | |
26 | { | |
27 | int ret = 0; | |
28 | ||
29 | while (table->mask) { | |
30 | ret = (dev->periphid & table->mask) == table->id; | |
31 | if (ret) | |
32 | break; | |
33 | table++; | |
34 | } | |
35 | ||
36 | return ret ? table : NULL; | |
37 | } | |
38 | ||
39 | static int amba_match(struct device *dev, struct device_driver *drv) | |
40 | { | |
41 | struct amba_device *pcdev = to_amba_device(dev); | |
42 | struct amba_driver *pcdrv = to_amba_driver(drv); | |
43 | ||
44 | return amba_lookup(pcdrv->id_table, pcdev) != NULL; | |
45 | } | |
46 | ||
47 | #ifdef CONFIG_HOTPLUG | |
7eff2e7a | 48 | static int amba_uevent(struct device *dev, struct kobj_uevent_env *env) |
1da177e4 LT |
49 | { |
50 | struct amba_device *pcdev = to_amba_device(dev); | |
7eff2e7a | 51 | int retval = 0; |
1da177e4 | 52 | |
7eff2e7a | 53 | retval = add_uevent_var(env, "AMBA_ID=%08x", pcdev->periphid); |
bf62456e | 54 | return retval; |
1da177e4 LT |
55 | } |
56 | #else | |
6d20b035 | 57 | #define amba_uevent NULL |
1da177e4 LT |
58 | #endif |
59 | ||
60 | static int amba_suspend(struct device *dev, pm_message_t state) | |
61 | { | |
62 | struct amba_driver *drv = to_amba_driver(dev->driver); | |
63 | int ret = 0; | |
64 | ||
65 | if (dev->driver && drv->suspend) | |
66 | ret = drv->suspend(to_amba_device(dev), state); | |
67 | return ret; | |
68 | } | |
69 | ||
70 | static int amba_resume(struct device *dev) | |
71 | { | |
72 | struct amba_driver *drv = to_amba_driver(dev->driver); | |
73 | int ret = 0; | |
74 | ||
75 | if (dev->driver && drv->resume) | |
76 | ret = drv->resume(to_amba_device(dev)); | |
77 | return ret; | |
78 | } | |
79 | ||
96b13f5c RK |
80 | #define amba_attr_func(name,fmt,arg...) \ |
81 | static ssize_t name##_show(struct device *_dev, \ | |
82 | struct device_attribute *attr, char *buf) \ | |
83 | { \ | |
84 | struct amba_device *dev = to_amba_device(_dev); \ | |
85 | return sprintf(buf, fmt, arg); \ | |
86 | } | |
87 | ||
88 | #define amba_attr(name,fmt,arg...) \ | |
89 | amba_attr_func(name,fmt,arg) \ | |
90 | static DEVICE_ATTR(name, S_IRUGO, name##_show, NULL) | |
91 | ||
92 | amba_attr_func(id, "%08x\n", dev->periphid); | |
93 | amba_attr(irq0, "%u\n", dev->irq[0]); | |
94 | amba_attr(irq1, "%u\n", dev->irq[1]); | |
95 | amba_attr_func(resource, "\t%016llx\t%016llx\t%016lx\n", | |
96 | (unsigned long long)dev->res.start, (unsigned long long)dev->res.end, | |
97 | dev->res.flags); | |
98 | ||
99 | static struct device_attribute amba_dev_attrs[] = { | |
100 | __ATTR_RO(id), | |
101 | __ATTR_RO(resource), | |
102 | __ATTR_NULL, | |
103 | }; | |
104 | ||
1da177e4 LT |
105 | /* |
106 | * Primecells are part of the Advanced Microcontroller Bus Architecture, | |
107 | * so we call the bus "amba". | |
108 | */ | |
109 | static struct bus_type amba_bustype = { | |
110 | .name = "amba", | |
96b13f5c | 111 | .dev_attrs = amba_dev_attrs, |
1da177e4 | 112 | .match = amba_match, |
6d20b035 | 113 | .uevent = amba_uevent, |
1da177e4 LT |
114 | .suspend = amba_suspend, |
115 | .resume = amba_resume, | |
116 | }; | |
117 | ||
118 | static int __init amba_init(void) | |
119 | { | |
120 | return bus_register(&amba_bustype); | |
121 | } | |
122 | ||
123 | postcore_initcall(amba_init); | |
124 | ||
7cfe2494 RK |
125 | static int amba_get_enable_pclk(struct amba_device *pcdev) |
126 | { | |
127 | struct clk *pclk = clk_get(&pcdev->dev, "apb_pclk"); | |
128 | int ret; | |
129 | ||
130 | pcdev->pclk = pclk; | |
131 | ||
132 | if (IS_ERR(pclk)) | |
133 | return PTR_ERR(pclk); | |
134 | ||
135 | ret = clk_enable(pclk); | |
136 | if (ret) | |
137 | clk_put(pclk); | |
138 | ||
139 | return ret; | |
140 | } | |
141 | ||
142 | static void amba_put_disable_pclk(struct amba_device *pcdev) | |
143 | { | |
144 | struct clk *pclk = pcdev->pclk; | |
145 | ||
146 | clk_disable(pclk); | |
147 | clk_put(pclk); | |
148 | } | |
149 | ||
65500fa9 LW |
150 | static int amba_get_enable_vcore(struct amba_device *pcdev) |
151 | { | |
152 | struct regulator *vcore = regulator_get(&pcdev->dev, "vcore"); | |
153 | int ret; | |
154 | ||
155 | pcdev->vcore = vcore; | |
156 | ||
157 | if (IS_ERR(vcore)) { | |
158 | /* It is OK not to supply a vcore regulator */ | |
159 | if (PTR_ERR(vcore) == -ENODEV) | |
160 | return 0; | |
161 | return PTR_ERR(vcore); | |
162 | } | |
163 | ||
164 | ret = regulator_enable(vcore); | |
165 | if (ret) { | |
166 | regulator_put(vcore); | |
167 | pcdev->vcore = ERR_PTR(-ENODEV); | |
168 | } | |
169 | ||
170 | return ret; | |
171 | } | |
172 | ||
173 | static void amba_put_disable_vcore(struct amba_device *pcdev) | |
174 | { | |
175 | struct regulator *vcore = pcdev->vcore; | |
176 | ||
177 | if (!IS_ERR(vcore)) { | |
178 | regulator_disable(vcore); | |
179 | regulator_put(vcore); | |
180 | } | |
181 | } | |
182 | ||
1da177e4 LT |
183 | /* |
184 | * These are the device model conversion veneers; they convert the | |
185 | * device model structures to our more specific structures. | |
186 | */ | |
187 | static int amba_probe(struct device *dev) | |
188 | { | |
189 | struct amba_device *pcdev = to_amba_device(dev); | |
190 | struct amba_driver *pcdrv = to_amba_driver(dev->driver); | |
7cfe2494 RK |
191 | struct amba_id *id = amba_lookup(pcdrv->id_table, pcdev); |
192 | int ret; | |
1da177e4 | 193 | |
7cfe2494 | 194 | do { |
65500fa9 LW |
195 | ret = amba_get_enable_vcore(pcdev); |
196 | if (ret) | |
197 | break; | |
198 | ||
7cfe2494 RK |
199 | ret = amba_get_enable_pclk(pcdev); |
200 | if (ret) | |
201 | break; | |
202 | ||
203 | ret = pcdrv->probe(pcdev, id); | |
204 | if (ret == 0) | |
205 | break; | |
1da177e4 | 206 | |
7cfe2494 | 207 | amba_put_disable_pclk(pcdev); |
65500fa9 | 208 | amba_put_disable_vcore(pcdev); |
7cfe2494 RK |
209 | } while (0); |
210 | ||
211 | return ret; | |
1da177e4 LT |
212 | } |
213 | ||
214 | static int amba_remove(struct device *dev) | |
215 | { | |
7cfe2494 | 216 | struct amba_device *pcdev = to_amba_device(dev); |
1da177e4 | 217 | struct amba_driver *drv = to_amba_driver(dev->driver); |
7cfe2494 RK |
218 | int ret = drv->remove(pcdev); |
219 | ||
220 | amba_put_disable_pclk(pcdev); | |
65500fa9 | 221 | amba_put_disable_vcore(pcdev); |
7cfe2494 RK |
222 | |
223 | return ret; | |
1da177e4 LT |
224 | } |
225 | ||
226 | static void amba_shutdown(struct device *dev) | |
227 | { | |
228 | struct amba_driver *drv = to_amba_driver(dev->driver); | |
229 | drv->shutdown(to_amba_device(dev)); | |
230 | } | |
231 | ||
232 | /** | |
233 | * amba_driver_register - register an AMBA device driver | |
234 | * @drv: amba device driver structure | |
235 | * | |
236 | * Register an AMBA device driver with the Linux device model | |
237 | * core. If devices pre-exist, the drivers probe function will | |
238 | * be called. | |
239 | */ | |
240 | int amba_driver_register(struct amba_driver *drv) | |
241 | { | |
242 | drv->drv.bus = &amba_bustype; | |
243 | ||
244 | #define SETFN(fn) if (drv->fn) drv->drv.fn = amba_##fn | |
245 | SETFN(probe); | |
246 | SETFN(remove); | |
247 | SETFN(shutdown); | |
248 | ||
249 | return driver_register(&drv->drv); | |
250 | } | |
251 | ||
252 | /** | |
253 | * amba_driver_unregister - remove an AMBA device driver | |
254 | * @drv: AMBA device driver structure to remove | |
255 | * | |
256 | * Unregister an AMBA device driver from the Linux device | |
257 | * model. The device model will call the drivers remove function | |
258 | * for each device the device driver is currently handling. | |
259 | */ | |
260 | void amba_driver_unregister(struct amba_driver *drv) | |
261 | { | |
262 | driver_unregister(&drv->drv); | |
263 | } | |
264 | ||
265 | ||
266 | static void amba_device_release(struct device *dev) | |
267 | { | |
268 | struct amba_device *d = to_amba_device(dev); | |
269 | ||
270 | if (d->res.parent) | |
271 | release_resource(&d->res); | |
272 | kfree(d); | |
273 | } | |
274 | ||
1da177e4 LT |
275 | /** |
276 | * amba_device_register - register an AMBA device | |
277 | * @dev: AMBA device to register | |
278 | * @parent: parent memory resource | |
279 | * | |
280 | * Setup the AMBA device, reading the cell ID if present. | |
281 | * Claim the resource, and register the AMBA device with | |
282 | * the Linux device manager. | |
283 | */ | |
284 | int amba_device_register(struct amba_device *dev, struct resource *parent) | |
285 | { | |
8afe0b96 | 286 | u32 size; |
1da177e4 LT |
287 | void __iomem *tmp; |
288 | int i, ret; | |
289 | ||
557dca5f RK |
290 | device_initialize(&dev->dev); |
291 | ||
292 | /* | |
293 | * Copy from device_add | |
294 | */ | |
295 | if (dev->dev.init_name) { | |
296 | dev_set_name(&dev->dev, "%s", dev->dev.init_name); | |
297 | dev->dev.init_name = NULL; | |
298 | } | |
299 | ||
1da177e4 LT |
300 | dev->dev.release = amba_device_release; |
301 | dev->dev.bus = &amba_bustype; | |
302 | dev->dev.dma_mask = &dev->dma_mask; | |
9d6b4c82 | 303 | dev->res.name = dev_name(&dev->dev); |
1da177e4 LT |
304 | |
305 | if (!dev->dev.coherent_dma_mask && dev->dma_mask) | |
306 | dev_warn(&dev->dev, "coherent dma mask is unset\n"); | |
307 | ||
308 | ret = request_resource(parent, &dev->res); | |
96b13f5c RK |
309 | if (ret) |
310 | goto err_out; | |
311 | ||
8afe0b96 LC |
312 | /* |
313 | * Dynamically calculate the size of the resource | |
314 | * and use this for iomap | |
315 | */ | |
316 | size = resource_size(&dev->res); | |
317 | tmp = ioremap(dev->res.start, size); | |
96b13f5c RK |
318 | if (!tmp) { |
319 | ret = -ENOMEM; | |
320 | goto err_release; | |
1da177e4 | 321 | } |
96b13f5c | 322 | |
7cfe2494 RK |
323 | ret = amba_get_enable_pclk(dev); |
324 | if (ret == 0) { | |
325 | u32 pid, cid; | |
96b13f5c | 326 | |
7cfe2494 RK |
327 | /* |
328 | * Read pid and cid based on size of resource | |
329 | * they are located at end of region | |
330 | */ | |
331 | for (pid = 0, i = 0; i < 4; i++) | |
332 | pid |= (readl(tmp + size - 0x20 + 4 * i) & 255) << | |
333 | (i * 8); | |
334 | for (cid = 0, i = 0; i < 4; i++) | |
335 | cid |= (readl(tmp + size - 0x10 + 4 * i) & 255) << | |
336 | (i * 8); | |
96b13f5c | 337 | |
7cfe2494 | 338 | amba_put_disable_pclk(dev); |
96b13f5c | 339 | |
01723a95 | 340 | if (cid == AMBA_CID) |
7cfe2494 RK |
341 | dev->periphid = pid; |
342 | ||
343 | if (!dev->periphid) | |
344 | ret = -ENODEV; | |
96b13f5c RK |
345 | } |
346 | ||
7cfe2494 RK |
347 | iounmap(tmp); |
348 | ||
349 | if (ret) | |
350 | goto err_release; | |
351 | ||
557dca5f | 352 | ret = device_add(&dev->dev); |
96b13f5c RK |
353 | if (ret) |
354 | goto err_release; | |
355 | ||
356 | if (dev->irq[0] != NO_IRQ) | |
357 | ret = device_create_file(&dev->dev, &dev_attr_irq0); | |
358 | if (ret == 0 && dev->irq[1] != NO_IRQ) | |
359 | ret = device_create_file(&dev->dev, &dev_attr_irq1); | |
360 | if (ret == 0) | |
361 | return ret; | |
362 | ||
363 | device_unregister(&dev->dev); | |
364 | ||
365 | err_release: | |
366 | release_resource(&dev->res); | |
367 | err_out: | |
1da177e4 LT |
368 | return ret; |
369 | } | |
370 | ||
371 | /** | |
372 | * amba_device_unregister - unregister an AMBA device | |
373 | * @dev: AMBA device to remove | |
374 | * | |
375 | * Remove the specified AMBA device from the Linux device | |
376 | * manager. All files associated with this object will be | |
377 | * destroyed, and device drivers notified that the device has | |
378 | * been removed. The AMBA device's resources including | |
379 | * the amba_device structure will be freed once all | |
380 | * references to it have been dropped. | |
381 | */ | |
382 | void amba_device_unregister(struct amba_device *dev) | |
383 | { | |
384 | device_unregister(&dev->dev); | |
385 | } | |
386 | ||
387 | ||
388 | struct find_data { | |
389 | struct amba_device *dev; | |
390 | struct device *parent; | |
391 | const char *busid; | |
392 | unsigned int id; | |
393 | unsigned int mask; | |
394 | }; | |
395 | ||
396 | static int amba_find_match(struct device *dev, void *data) | |
397 | { | |
398 | struct find_data *d = data; | |
399 | struct amba_device *pcdev = to_amba_device(dev); | |
400 | int r; | |
401 | ||
402 | r = (pcdev->periphid & d->mask) == d->id; | |
403 | if (d->parent) | |
404 | r &= d->parent == dev->parent; | |
405 | if (d->busid) | |
9d6b4c82 | 406 | r &= strcmp(dev_name(dev), d->busid) == 0; |
1da177e4 LT |
407 | |
408 | if (r) { | |
409 | get_device(dev); | |
410 | d->dev = pcdev; | |
411 | } | |
412 | ||
413 | return r; | |
414 | } | |
415 | ||
416 | /** | |
417 | * amba_find_device - locate an AMBA device given a bus id | |
418 | * @busid: bus id for device (or NULL) | |
419 | * @parent: parent device (or NULL) | |
420 | * @id: peripheral ID (or 0) | |
421 | * @mask: peripheral ID mask (or 0) | |
422 | * | |
423 | * Return the AMBA device corresponding to the supplied parameters. | |
424 | * If no device matches, returns NULL. | |
425 | * | |
426 | * NOTE: When a valid device is found, its refcount is | |
427 | * incremented, and must be decremented before the returned | |
428 | * reference. | |
429 | */ | |
430 | struct amba_device * | |
431 | amba_find_device(const char *busid, struct device *parent, unsigned int id, | |
432 | unsigned int mask) | |
433 | { | |
434 | struct find_data data; | |
435 | ||
436 | data.dev = NULL; | |
437 | data.parent = parent; | |
438 | data.busid = busid; | |
439 | data.id = id; | |
440 | data.mask = mask; | |
441 | ||
442 | bus_for_each_dev(&amba_bustype, NULL, &data, amba_find_match); | |
443 | ||
444 | return data.dev; | |
445 | } | |
446 | ||
447 | /** | |
448 | * amba_request_regions - request all mem regions associated with device | |
449 | * @dev: amba_device structure for device | |
450 | * @name: name, or NULL to use driver name | |
451 | */ | |
452 | int amba_request_regions(struct amba_device *dev, const char *name) | |
453 | { | |
454 | int ret = 0; | |
8afe0b96 | 455 | u32 size; |
1da177e4 LT |
456 | |
457 | if (!name) | |
458 | name = dev->dev.driver->name; | |
459 | ||
8afe0b96 LC |
460 | size = resource_size(&dev->res); |
461 | ||
462 | if (!request_mem_region(dev->res.start, size, name)) | |
1da177e4 LT |
463 | ret = -EBUSY; |
464 | ||
465 | return ret; | |
466 | } | |
467 | ||
468 | /** | |
469 | * amba_release_regions - release mem regions assoicated with device | |
470 | * @dev: amba_device structure for device | |
471 | * | |
472 | * Release regions claimed by a successful call to amba_request_regions. | |
473 | */ | |
474 | void amba_release_regions(struct amba_device *dev) | |
475 | { | |
8afe0b96 LC |
476 | u32 size; |
477 | ||
478 | size = resource_size(&dev->res); | |
479 | release_mem_region(dev->res.start, size); | |
1da177e4 LT |
480 | } |
481 | ||
482 | EXPORT_SYMBOL(amba_driver_register); | |
483 | EXPORT_SYMBOL(amba_driver_unregister); | |
484 | EXPORT_SYMBOL(amba_device_register); | |
485 | EXPORT_SYMBOL(amba_device_unregister); | |
486 | EXPORT_SYMBOL(amba_find_device); | |
487 | EXPORT_SYMBOL(amba_request_regions); | |
488 | EXPORT_SYMBOL(amba_release_regions); |