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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> | |
a62c80e5 | 15 | #include <linux/amba/bus.h> |
1da177e4 LT |
16 | |
17 | #include <asm/io.h> | |
1da177e4 LT |
18 | #include <asm/sizes.h> |
19 | ||
20 | #define to_amba_device(d) container_of(d, struct amba_device, dev) | |
21 | #define to_amba_driver(d) container_of(d, struct amba_driver, drv) | |
22 | ||
23 | static struct amba_id * | |
24 | amba_lookup(struct amba_id *table, struct amba_device *dev) | |
25 | { | |
26 | int ret = 0; | |
27 | ||
28 | while (table->mask) { | |
29 | ret = (dev->periphid & table->mask) == table->id; | |
30 | if (ret) | |
31 | break; | |
32 | table++; | |
33 | } | |
34 | ||
35 | return ret ? table : NULL; | |
36 | } | |
37 | ||
38 | static int amba_match(struct device *dev, struct device_driver *drv) | |
39 | { | |
40 | struct amba_device *pcdev = to_amba_device(dev); | |
41 | struct amba_driver *pcdrv = to_amba_driver(drv); | |
42 | ||
43 | return amba_lookup(pcdrv->id_table, pcdev) != NULL; | |
44 | } | |
45 | ||
46 | #ifdef CONFIG_HOTPLUG | |
7eff2e7a | 47 | static int amba_uevent(struct device *dev, struct kobj_uevent_env *env) |
1da177e4 LT |
48 | { |
49 | struct amba_device *pcdev = to_amba_device(dev); | |
7eff2e7a | 50 | int retval = 0; |
1da177e4 | 51 | |
7eff2e7a | 52 | retval = add_uevent_var(env, "AMBA_ID=%08x", pcdev->periphid); |
bf62456e | 53 | return retval; |
1da177e4 LT |
54 | } |
55 | #else | |
6d20b035 | 56 | #define amba_uevent NULL |
1da177e4 LT |
57 | #endif |
58 | ||
59 | static int amba_suspend(struct device *dev, pm_message_t state) | |
60 | { | |
61 | struct amba_driver *drv = to_amba_driver(dev->driver); | |
62 | int ret = 0; | |
63 | ||
64 | if (dev->driver && drv->suspend) | |
65 | ret = drv->suspend(to_amba_device(dev), state); | |
66 | return ret; | |
67 | } | |
68 | ||
69 | static int amba_resume(struct device *dev) | |
70 | { | |
71 | struct amba_driver *drv = to_amba_driver(dev->driver); | |
72 | int ret = 0; | |
73 | ||
74 | if (dev->driver && drv->resume) | |
75 | ret = drv->resume(to_amba_device(dev)); | |
76 | return ret; | |
77 | } | |
78 | ||
96b13f5c RK |
79 | #define amba_attr_func(name,fmt,arg...) \ |
80 | static ssize_t name##_show(struct device *_dev, \ | |
81 | struct device_attribute *attr, char *buf) \ | |
82 | { \ | |
83 | struct amba_device *dev = to_amba_device(_dev); \ | |
84 | return sprintf(buf, fmt, arg); \ | |
85 | } | |
86 | ||
87 | #define amba_attr(name,fmt,arg...) \ | |
88 | amba_attr_func(name,fmt,arg) \ | |
89 | static DEVICE_ATTR(name, S_IRUGO, name##_show, NULL) | |
90 | ||
91 | amba_attr_func(id, "%08x\n", dev->periphid); | |
92 | amba_attr(irq0, "%u\n", dev->irq[0]); | |
93 | amba_attr(irq1, "%u\n", dev->irq[1]); | |
94 | amba_attr_func(resource, "\t%016llx\t%016llx\t%016lx\n", | |
95 | (unsigned long long)dev->res.start, (unsigned long long)dev->res.end, | |
96 | dev->res.flags); | |
97 | ||
98 | static struct device_attribute amba_dev_attrs[] = { | |
99 | __ATTR_RO(id), | |
100 | __ATTR_RO(resource), | |
101 | __ATTR_NULL, | |
102 | }; | |
103 | ||
1da177e4 LT |
104 | /* |
105 | * Primecells are part of the Advanced Microcontroller Bus Architecture, | |
106 | * so we call the bus "amba". | |
107 | */ | |
108 | static struct bus_type amba_bustype = { | |
109 | .name = "amba", | |
96b13f5c | 110 | .dev_attrs = amba_dev_attrs, |
1da177e4 | 111 | .match = amba_match, |
6d20b035 | 112 | .uevent = amba_uevent, |
1da177e4 LT |
113 | .suspend = amba_suspend, |
114 | .resume = amba_resume, | |
115 | }; | |
116 | ||
117 | static int __init amba_init(void) | |
118 | { | |
119 | return bus_register(&amba_bustype); | |
120 | } | |
121 | ||
122 | postcore_initcall(amba_init); | |
123 | ||
124 | /* | |
125 | * These are the device model conversion veneers; they convert the | |
126 | * device model structures to our more specific structures. | |
127 | */ | |
128 | static int amba_probe(struct device *dev) | |
129 | { | |
130 | struct amba_device *pcdev = to_amba_device(dev); | |
131 | struct amba_driver *pcdrv = to_amba_driver(dev->driver); | |
132 | struct amba_id *id; | |
133 | ||
134 | id = amba_lookup(pcdrv->id_table, pcdev); | |
135 | ||
136 | return pcdrv->probe(pcdev, id); | |
137 | } | |
138 | ||
139 | static int amba_remove(struct device *dev) | |
140 | { | |
141 | struct amba_driver *drv = to_amba_driver(dev->driver); | |
142 | return drv->remove(to_amba_device(dev)); | |
143 | } | |
144 | ||
145 | static void amba_shutdown(struct device *dev) | |
146 | { | |
147 | struct amba_driver *drv = to_amba_driver(dev->driver); | |
148 | drv->shutdown(to_amba_device(dev)); | |
149 | } | |
150 | ||
151 | /** | |
152 | * amba_driver_register - register an AMBA device driver | |
153 | * @drv: amba device driver structure | |
154 | * | |
155 | * Register an AMBA device driver with the Linux device model | |
156 | * core. If devices pre-exist, the drivers probe function will | |
157 | * be called. | |
158 | */ | |
159 | int amba_driver_register(struct amba_driver *drv) | |
160 | { | |
161 | drv->drv.bus = &amba_bustype; | |
162 | ||
163 | #define SETFN(fn) if (drv->fn) drv->drv.fn = amba_##fn | |
164 | SETFN(probe); | |
165 | SETFN(remove); | |
166 | SETFN(shutdown); | |
167 | ||
168 | return driver_register(&drv->drv); | |
169 | } | |
170 | ||
171 | /** | |
172 | * amba_driver_unregister - remove an AMBA device driver | |
173 | * @drv: AMBA device driver structure to remove | |
174 | * | |
175 | * Unregister an AMBA device driver from the Linux device | |
176 | * model. The device model will call the drivers remove function | |
177 | * for each device the device driver is currently handling. | |
178 | */ | |
179 | void amba_driver_unregister(struct amba_driver *drv) | |
180 | { | |
181 | driver_unregister(&drv->drv); | |
182 | } | |
183 | ||
184 | ||
185 | static void amba_device_release(struct device *dev) | |
186 | { | |
187 | struct amba_device *d = to_amba_device(dev); | |
188 | ||
189 | if (d->res.parent) | |
190 | release_resource(&d->res); | |
191 | kfree(d); | |
192 | } | |
193 | ||
1da177e4 LT |
194 | /** |
195 | * amba_device_register - register an AMBA device | |
196 | * @dev: AMBA device to register | |
197 | * @parent: parent memory resource | |
198 | * | |
199 | * Setup the AMBA device, reading the cell ID if present. | |
200 | * Claim the resource, and register the AMBA device with | |
201 | * the Linux device manager. | |
202 | */ | |
203 | int amba_device_register(struct amba_device *dev, struct resource *parent) | |
204 | { | |
205 | u32 pid, cid; | |
206 | void __iomem *tmp; | |
207 | int i, ret; | |
208 | ||
209 | dev->dev.release = amba_device_release; | |
210 | dev->dev.bus = &amba_bustype; | |
211 | dev->dev.dma_mask = &dev->dma_mask; | |
212 | dev->res.name = dev->dev.bus_id; | |
213 | ||
214 | if (!dev->dev.coherent_dma_mask && dev->dma_mask) | |
215 | dev_warn(&dev->dev, "coherent dma mask is unset\n"); | |
216 | ||
217 | ret = request_resource(parent, &dev->res); | |
96b13f5c RK |
218 | if (ret) |
219 | goto err_out; | |
220 | ||
221 | tmp = ioremap(dev->res.start, SZ_4K); | |
222 | if (!tmp) { | |
223 | ret = -ENOMEM; | |
224 | goto err_release; | |
1da177e4 | 225 | } |
96b13f5c RK |
226 | |
227 | for (pid = 0, i = 0; i < 4; i++) | |
228 | pid |= (readl(tmp + 0xfe0 + 4 * i) & 255) << (i * 8); | |
229 | for (cid = 0, i = 0; i < 4; i++) | |
230 | cid |= (readl(tmp + 0xff0 + 4 * i) & 255) << (i * 8); | |
231 | ||
232 | iounmap(tmp); | |
233 | ||
234 | if (cid == 0xb105f00d) | |
235 | dev->periphid = pid; | |
236 | ||
237 | if (!dev->periphid) { | |
238 | ret = -ENODEV; | |
239 | goto err_release; | |
240 | } | |
241 | ||
242 | ret = device_register(&dev->dev); | |
243 | if (ret) | |
244 | goto err_release; | |
245 | ||
246 | if (dev->irq[0] != NO_IRQ) | |
247 | ret = device_create_file(&dev->dev, &dev_attr_irq0); | |
248 | if (ret == 0 && dev->irq[1] != NO_IRQ) | |
249 | ret = device_create_file(&dev->dev, &dev_attr_irq1); | |
250 | if (ret == 0) | |
251 | return ret; | |
252 | ||
253 | device_unregister(&dev->dev); | |
254 | ||
255 | err_release: | |
256 | release_resource(&dev->res); | |
257 | err_out: | |
1da177e4 LT |
258 | return ret; |
259 | } | |
260 | ||
261 | /** | |
262 | * amba_device_unregister - unregister an AMBA device | |
263 | * @dev: AMBA device to remove | |
264 | * | |
265 | * Remove the specified AMBA device from the Linux device | |
266 | * manager. All files associated with this object will be | |
267 | * destroyed, and device drivers notified that the device has | |
268 | * been removed. The AMBA device's resources including | |
269 | * the amba_device structure will be freed once all | |
270 | * references to it have been dropped. | |
271 | */ | |
272 | void amba_device_unregister(struct amba_device *dev) | |
273 | { | |
274 | device_unregister(&dev->dev); | |
275 | } | |
276 | ||
277 | ||
278 | struct find_data { | |
279 | struct amba_device *dev; | |
280 | struct device *parent; | |
281 | const char *busid; | |
282 | unsigned int id; | |
283 | unsigned int mask; | |
284 | }; | |
285 | ||
286 | static int amba_find_match(struct device *dev, void *data) | |
287 | { | |
288 | struct find_data *d = data; | |
289 | struct amba_device *pcdev = to_amba_device(dev); | |
290 | int r; | |
291 | ||
292 | r = (pcdev->periphid & d->mask) == d->id; | |
293 | if (d->parent) | |
294 | r &= d->parent == dev->parent; | |
295 | if (d->busid) | |
296 | r &= strcmp(dev->bus_id, d->busid) == 0; | |
297 | ||
298 | if (r) { | |
299 | get_device(dev); | |
300 | d->dev = pcdev; | |
301 | } | |
302 | ||
303 | return r; | |
304 | } | |
305 | ||
306 | /** | |
307 | * amba_find_device - locate an AMBA device given a bus id | |
308 | * @busid: bus id for device (or NULL) | |
309 | * @parent: parent device (or NULL) | |
310 | * @id: peripheral ID (or 0) | |
311 | * @mask: peripheral ID mask (or 0) | |
312 | * | |
313 | * Return the AMBA device corresponding to the supplied parameters. | |
314 | * If no device matches, returns NULL. | |
315 | * | |
316 | * NOTE: When a valid device is found, its refcount is | |
317 | * incremented, and must be decremented before the returned | |
318 | * reference. | |
319 | */ | |
320 | struct amba_device * | |
321 | amba_find_device(const char *busid, struct device *parent, unsigned int id, | |
322 | unsigned int mask) | |
323 | { | |
324 | struct find_data data; | |
325 | ||
326 | data.dev = NULL; | |
327 | data.parent = parent; | |
328 | data.busid = busid; | |
329 | data.id = id; | |
330 | data.mask = mask; | |
331 | ||
332 | bus_for_each_dev(&amba_bustype, NULL, &data, amba_find_match); | |
333 | ||
334 | return data.dev; | |
335 | } | |
336 | ||
337 | /** | |
338 | * amba_request_regions - request all mem regions associated with device | |
339 | * @dev: amba_device structure for device | |
340 | * @name: name, or NULL to use driver name | |
341 | */ | |
342 | int amba_request_regions(struct amba_device *dev, const char *name) | |
343 | { | |
344 | int ret = 0; | |
345 | ||
346 | if (!name) | |
347 | name = dev->dev.driver->name; | |
348 | ||
349 | if (!request_mem_region(dev->res.start, SZ_4K, name)) | |
350 | ret = -EBUSY; | |
351 | ||
352 | return ret; | |
353 | } | |
354 | ||
355 | /** | |
356 | * amba_release_regions - release mem regions assoicated with device | |
357 | * @dev: amba_device structure for device | |
358 | * | |
359 | * Release regions claimed by a successful call to amba_request_regions. | |
360 | */ | |
361 | void amba_release_regions(struct amba_device *dev) | |
362 | { | |
363 | release_mem_region(dev->res.start, SZ_4K); | |
364 | } | |
365 | ||
366 | EXPORT_SYMBOL(amba_driver_register); | |
367 | EXPORT_SYMBOL(amba_driver_unregister); | |
368 | EXPORT_SYMBOL(amba_device_register); | |
369 | EXPORT_SYMBOL(amba_device_unregister); | |
370 | EXPORT_SYMBOL(amba_find_device); | |
371 | EXPORT_SYMBOL(amba_request_regions); | |
372 | EXPORT_SYMBOL(amba_release_regions); |