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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 | ||
1da177e4 LT |
150 | /* |
151 | * These are the device model conversion veneers; they convert the | |
152 | * device model structures to our more specific structures. | |
153 | */ | |
154 | static int amba_probe(struct device *dev) | |
155 | { | |
156 | struct amba_device *pcdev = to_amba_device(dev); | |
157 | struct amba_driver *pcdrv = to_amba_driver(dev->driver); | |
7cfe2494 RK |
158 | struct amba_id *id = amba_lookup(pcdrv->id_table, pcdev); |
159 | int ret; | |
1da177e4 | 160 | |
7cfe2494 RK |
161 | do { |
162 | ret = amba_get_enable_pclk(pcdev); | |
163 | if (ret) | |
164 | break; | |
165 | ||
166 | ret = pcdrv->probe(pcdev, id); | |
167 | if (ret == 0) | |
168 | break; | |
1da177e4 | 169 | |
7cfe2494 RK |
170 | amba_put_disable_pclk(pcdev); |
171 | } while (0); | |
172 | ||
173 | return ret; | |
1da177e4 LT |
174 | } |
175 | ||
176 | static int amba_remove(struct device *dev) | |
177 | { | |
7cfe2494 | 178 | struct amba_device *pcdev = to_amba_device(dev); |
1da177e4 | 179 | struct amba_driver *drv = to_amba_driver(dev->driver); |
7cfe2494 RK |
180 | int ret = drv->remove(pcdev); |
181 | ||
182 | amba_put_disable_pclk(pcdev); | |
183 | ||
184 | return ret; | |
1da177e4 LT |
185 | } |
186 | ||
187 | static void amba_shutdown(struct device *dev) | |
188 | { | |
189 | struct amba_driver *drv = to_amba_driver(dev->driver); | |
190 | drv->shutdown(to_amba_device(dev)); | |
191 | } | |
192 | ||
193 | /** | |
194 | * amba_driver_register - register an AMBA device driver | |
195 | * @drv: amba device driver structure | |
196 | * | |
197 | * Register an AMBA device driver with the Linux device model | |
198 | * core. If devices pre-exist, the drivers probe function will | |
199 | * be called. | |
200 | */ | |
201 | int amba_driver_register(struct amba_driver *drv) | |
202 | { | |
203 | drv->drv.bus = &amba_bustype; | |
204 | ||
205 | #define SETFN(fn) if (drv->fn) drv->drv.fn = amba_##fn | |
206 | SETFN(probe); | |
207 | SETFN(remove); | |
208 | SETFN(shutdown); | |
209 | ||
210 | return driver_register(&drv->drv); | |
211 | } | |
212 | ||
213 | /** | |
214 | * amba_driver_unregister - remove an AMBA device driver | |
215 | * @drv: AMBA device driver structure to remove | |
216 | * | |
217 | * Unregister an AMBA device driver from the Linux device | |
218 | * model. The device model will call the drivers remove function | |
219 | * for each device the device driver is currently handling. | |
220 | */ | |
221 | void amba_driver_unregister(struct amba_driver *drv) | |
222 | { | |
223 | driver_unregister(&drv->drv); | |
224 | } | |
225 | ||
226 | ||
227 | static void amba_device_release(struct device *dev) | |
228 | { | |
229 | struct amba_device *d = to_amba_device(dev); | |
230 | ||
231 | if (d->res.parent) | |
232 | release_resource(&d->res); | |
233 | kfree(d); | |
234 | } | |
235 | ||
1da177e4 LT |
236 | /** |
237 | * amba_device_register - register an AMBA device | |
238 | * @dev: AMBA device to register | |
239 | * @parent: parent memory resource | |
240 | * | |
241 | * Setup the AMBA device, reading the cell ID if present. | |
242 | * Claim the resource, and register the AMBA device with | |
243 | * the Linux device manager. | |
244 | */ | |
245 | int amba_device_register(struct amba_device *dev, struct resource *parent) | |
246 | { | |
8afe0b96 | 247 | u32 size; |
1da177e4 LT |
248 | void __iomem *tmp; |
249 | int i, ret; | |
250 | ||
557dca5f RK |
251 | device_initialize(&dev->dev); |
252 | ||
253 | /* | |
254 | * Copy from device_add | |
255 | */ | |
256 | if (dev->dev.init_name) { | |
257 | dev_set_name(&dev->dev, "%s", dev->dev.init_name); | |
258 | dev->dev.init_name = NULL; | |
259 | } | |
260 | ||
1da177e4 LT |
261 | dev->dev.release = amba_device_release; |
262 | dev->dev.bus = &amba_bustype; | |
263 | dev->dev.dma_mask = &dev->dma_mask; | |
9d6b4c82 | 264 | dev->res.name = dev_name(&dev->dev); |
1da177e4 LT |
265 | |
266 | if (!dev->dev.coherent_dma_mask && dev->dma_mask) | |
267 | dev_warn(&dev->dev, "coherent dma mask is unset\n"); | |
268 | ||
269 | ret = request_resource(parent, &dev->res); | |
96b13f5c RK |
270 | if (ret) |
271 | goto err_out; | |
272 | ||
8afe0b96 LC |
273 | /* |
274 | * Dynamically calculate the size of the resource | |
275 | * and use this for iomap | |
276 | */ | |
277 | size = resource_size(&dev->res); | |
278 | tmp = ioremap(dev->res.start, size); | |
96b13f5c RK |
279 | if (!tmp) { |
280 | ret = -ENOMEM; | |
281 | goto err_release; | |
1da177e4 | 282 | } |
96b13f5c | 283 | |
7cfe2494 RK |
284 | ret = amba_get_enable_pclk(dev); |
285 | if (ret == 0) { | |
286 | u32 pid, cid; | |
96b13f5c | 287 | |
7cfe2494 RK |
288 | /* |
289 | * Read pid and cid based on size of resource | |
290 | * they are located at end of region | |
291 | */ | |
292 | for (pid = 0, i = 0; i < 4; i++) | |
293 | pid |= (readl(tmp + size - 0x20 + 4 * i) & 255) << | |
294 | (i * 8); | |
295 | for (cid = 0, i = 0; i < 4; i++) | |
296 | cid |= (readl(tmp + size - 0x10 + 4 * i) & 255) << | |
297 | (i * 8); | |
96b13f5c | 298 | |
7cfe2494 | 299 | amba_put_disable_pclk(dev); |
96b13f5c | 300 | |
01723a95 | 301 | if (cid == AMBA_CID) |
7cfe2494 RK |
302 | dev->periphid = pid; |
303 | ||
304 | if (!dev->periphid) | |
305 | ret = -ENODEV; | |
96b13f5c RK |
306 | } |
307 | ||
7cfe2494 RK |
308 | iounmap(tmp); |
309 | ||
310 | if (ret) | |
311 | goto err_release; | |
312 | ||
557dca5f | 313 | ret = device_add(&dev->dev); |
96b13f5c RK |
314 | if (ret) |
315 | goto err_release; | |
316 | ||
317 | if (dev->irq[0] != NO_IRQ) | |
318 | ret = device_create_file(&dev->dev, &dev_attr_irq0); | |
319 | if (ret == 0 && dev->irq[1] != NO_IRQ) | |
320 | ret = device_create_file(&dev->dev, &dev_attr_irq1); | |
321 | if (ret == 0) | |
322 | return ret; | |
323 | ||
324 | device_unregister(&dev->dev); | |
325 | ||
326 | err_release: | |
327 | release_resource(&dev->res); | |
328 | err_out: | |
1da177e4 LT |
329 | return ret; |
330 | } | |
331 | ||
332 | /** | |
333 | * amba_device_unregister - unregister an AMBA device | |
334 | * @dev: AMBA device to remove | |
335 | * | |
336 | * Remove the specified AMBA device from the Linux device | |
337 | * manager. All files associated with this object will be | |
338 | * destroyed, and device drivers notified that the device has | |
339 | * been removed. The AMBA device's resources including | |
340 | * the amba_device structure will be freed once all | |
341 | * references to it have been dropped. | |
342 | */ | |
343 | void amba_device_unregister(struct amba_device *dev) | |
344 | { | |
345 | device_unregister(&dev->dev); | |
346 | } | |
347 | ||
348 | ||
349 | struct find_data { | |
350 | struct amba_device *dev; | |
351 | struct device *parent; | |
352 | const char *busid; | |
353 | unsigned int id; | |
354 | unsigned int mask; | |
355 | }; | |
356 | ||
357 | static int amba_find_match(struct device *dev, void *data) | |
358 | { | |
359 | struct find_data *d = data; | |
360 | struct amba_device *pcdev = to_amba_device(dev); | |
361 | int r; | |
362 | ||
363 | r = (pcdev->periphid & d->mask) == d->id; | |
364 | if (d->parent) | |
365 | r &= d->parent == dev->parent; | |
366 | if (d->busid) | |
9d6b4c82 | 367 | r &= strcmp(dev_name(dev), d->busid) == 0; |
1da177e4 LT |
368 | |
369 | if (r) { | |
370 | get_device(dev); | |
371 | d->dev = pcdev; | |
372 | } | |
373 | ||
374 | return r; | |
375 | } | |
376 | ||
377 | /** | |
378 | * amba_find_device - locate an AMBA device given a bus id | |
379 | * @busid: bus id for device (or NULL) | |
380 | * @parent: parent device (or NULL) | |
381 | * @id: peripheral ID (or 0) | |
382 | * @mask: peripheral ID mask (or 0) | |
383 | * | |
384 | * Return the AMBA device corresponding to the supplied parameters. | |
385 | * If no device matches, returns NULL. | |
386 | * | |
387 | * NOTE: When a valid device is found, its refcount is | |
388 | * incremented, and must be decremented before the returned | |
389 | * reference. | |
390 | */ | |
391 | struct amba_device * | |
392 | amba_find_device(const char *busid, struct device *parent, unsigned int id, | |
393 | unsigned int mask) | |
394 | { | |
395 | struct find_data data; | |
396 | ||
397 | data.dev = NULL; | |
398 | data.parent = parent; | |
399 | data.busid = busid; | |
400 | data.id = id; | |
401 | data.mask = mask; | |
402 | ||
403 | bus_for_each_dev(&amba_bustype, NULL, &data, amba_find_match); | |
404 | ||
405 | return data.dev; | |
406 | } | |
407 | ||
408 | /** | |
409 | * amba_request_regions - request all mem regions associated with device | |
410 | * @dev: amba_device structure for device | |
411 | * @name: name, or NULL to use driver name | |
412 | */ | |
413 | int amba_request_regions(struct amba_device *dev, const char *name) | |
414 | { | |
415 | int ret = 0; | |
8afe0b96 | 416 | u32 size; |
1da177e4 LT |
417 | |
418 | if (!name) | |
419 | name = dev->dev.driver->name; | |
420 | ||
8afe0b96 LC |
421 | size = resource_size(&dev->res); |
422 | ||
423 | if (!request_mem_region(dev->res.start, size, name)) | |
1da177e4 LT |
424 | ret = -EBUSY; |
425 | ||
426 | return ret; | |
427 | } | |
428 | ||
429 | /** | |
430 | * amba_release_regions - release mem regions assoicated with device | |
431 | * @dev: amba_device structure for device | |
432 | * | |
433 | * Release regions claimed by a successful call to amba_request_regions. | |
434 | */ | |
435 | void amba_release_regions(struct amba_device *dev) | |
436 | { | |
8afe0b96 LC |
437 | u32 size; |
438 | ||
439 | size = resource_size(&dev->res); | |
440 | release_mem_region(dev->res.start, size); | |
1da177e4 LT |
441 | } |
442 | ||
443 | EXPORT_SYMBOL(amba_driver_register); | |
444 | EXPORT_SYMBOL(amba_driver_unregister); | |
445 | EXPORT_SYMBOL(amba_device_register); | |
446 | EXPORT_SYMBOL(amba_device_unregister); | |
447 | EXPORT_SYMBOL(amba_find_device); | |
448 | EXPORT_SYMBOL(amba_request_regions); | |
449 | EXPORT_SYMBOL(amba_release_regions); |