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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 | |
6d20b035 | 47 | static int amba_uevent(struct device *dev, char **envp, int nr_env, char *buf, int bufsz) |
1da177e4 LT |
48 | { |
49 | struct amba_device *pcdev = to_amba_device(dev); | |
50 | ||
51 | if (nr_env < 2) | |
52 | return -ENOMEM; | |
53 | ||
54 | snprintf(buf, bufsz, "AMBA_ID=%08x", pcdev->periphid); | |
55 | *envp++ = buf; | |
56 | *envp++ = NULL; | |
57 | return 0; | |
58 | } | |
59 | #else | |
6d20b035 | 60 | #define amba_uevent NULL |
1da177e4 LT |
61 | #endif |
62 | ||
63 | static int amba_suspend(struct device *dev, pm_message_t state) | |
64 | { | |
65 | struct amba_driver *drv = to_amba_driver(dev->driver); | |
66 | int ret = 0; | |
67 | ||
68 | if (dev->driver && drv->suspend) | |
69 | ret = drv->suspend(to_amba_device(dev), state); | |
70 | return ret; | |
71 | } | |
72 | ||
73 | static int amba_resume(struct device *dev) | |
74 | { | |
75 | struct amba_driver *drv = to_amba_driver(dev->driver); | |
76 | int ret = 0; | |
77 | ||
78 | if (dev->driver && drv->resume) | |
79 | ret = drv->resume(to_amba_device(dev)); | |
80 | return ret; | |
81 | } | |
82 | ||
96b13f5c RK |
83 | #define amba_attr_func(name,fmt,arg...) \ |
84 | static ssize_t name##_show(struct device *_dev, \ | |
85 | struct device_attribute *attr, char *buf) \ | |
86 | { \ | |
87 | struct amba_device *dev = to_amba_device(_dev); \ | |
88 | return sprintf(buf, fmt, arg); \ | |
89 | } | |
90 | ||
91 | #define amba_attr(name,fmt,arg...) \ | |
92 | amba_attr_func(name,fmt,arg) \ | |
93 | static DEVICE_ATTR(name, S_IRUGO, name##_show, NULL) | |
94 | ||
95 | amba_attr_func(id, "%08x\n", dev->periphid); | |
96 | amba_attr(irq0, "%u\n", dev->irq[0]); | |
97 | amba_attr(irq1, "%u\n", dev->irq[1]); | |
98 | amba_attr_func(resource, "\t%016llx\t%016llx\t%016lx\n", | |
99 | (unsigned long long)dev->res.start, (unsigned long long)dev->res.end, | |
100 | dev->res.flags); | |
101 | ||
102 | static struct device_attribute amba_dev_attrs[] = { | |
103 | __ATTR_RO(id), | |
104 | __ATTR_RO(resource), | |
105 | __ATTR_NULL, | |
106 | }; | |
107 | ||
1da177e4 LT |
108 | /* |
109 | * Primecells are part of the Advanced Microcontroller Bus Architecture, | |
110 | * so we call the bus "amba". | |
111 | */ | |
112 | static struct bus_type amba_bustype = { | |
113 | .name = "amba", | |
96b13f5c | 114 | .dev_attrs = amba_dev_attrs, |
1da177e4 | 115 | .match = amba_match, |
6d20b035 | 116 | .uevent = amba_uevent, |
1da177e4 LT |
117 | .suspend = amba_suspend, |
118 | .resume = amba_resume, | |
119 | }; | |
120 | ||
121 | static int __init amba_init(void) | |
122 | { | |
123 | return bus_register(&amba_bustype); | |
124 | } | |
125 | ||
126 | postcore_initcall(amba_init); | |
127 | ||
128 | /* | |
129 | * These are the device model conversion veneers; they convert the | |
130 | * device model structures to our more specific structures. | |
131 | */ | |
132 | static int amba_probe(struct device *dev) | |
133 | { | |
134 | struct amba_device *pcdev = to_amba_device(dev); | |
135 | struct amba_driver *pcdrv = to_amba_driver(dev->driver); | |
136 | struct amba_id *id; | |
137 | ||
138 | id = amba_lookup(pcdrv->id_table, pcdev); | |
139 | ||
140 | return pcdrv->probe(pcdev, id); | |
141 | } | |
142 | ||
143 | static int amba_remove(struct device *dev) | |
144 | { | |
145 | struct amba_driver *drv = to_amba_driver(dev->driver); | |
146 | return drv->remove(to_amba_device(dev)); | |
147 | } | |
148 | ||
149 | static void amba_shutdown(struct device *dev) | |
150 | { | |
151 | struct amba_driver *drv = to_amba_driver(dev->driver); | |
152 | drv->shutdown(to_amba_device(dev)); | |
153 | } | |
154 | ||
155 | /** | |
156 | * amba_driver_register - register an AMBA device driver | |
157 | * @drv: amba device driver structure | |
158 | * | |
159 | * Register an AMBA device driver with the Linux device model | |
160 | * core. If devices pre-exist, the drivers probe function will | |
161 | * be called. | |
162 | */ | |
163 | int amba_driver_register(struct amba_driver *drv) | |
164 | { | |
165 | drv->drv.bus = &amba_bustype; | |
166 | ||
167 | #define SETFN(fn) if (drv->fn) drv->drv.fn = amba_##fn | |
168 | SETFN(probe); | |
169 | SETFN(remove); | |
170 | SETFN(shutdown); | |
171 | ||
172 | return driver_register(&drv->drv); | |
173 | } | |
174 | ||
175 | /** | |
176 | * amba_driver_unregister - remove an AMBA device driver | |
177 | * @drv: AMBA device driver structure to remove | |
178 | * | |
179 | * Unregister an AMBA device driver from the Linux device | |
180 | * model. The device model will call the drivers remove function | |
181 | * for each device the device driver is currently handling. | |
182 | */ | |
183 | void amba_driver_unregister(struct amba_driver *drv) | |
184 | { | |
185 | driver_unregister(&drv->drv); | |
186 | } | |
187 | ||
188 | ||
189 | static void amba_device_release(struct device *dev) | |
190 | { | |
191 | struct amba_device *d = to_amba_device(dev); | |
192 | ||
193 | if (d->res.parent) | |
194 | release_resource(&d->res); | |
195 | kfree(d); | |
196 | } | |
197 | ||
1da177e4 LT |
198 | /** |
199 | * amba_device_register - register an AMBA device | |
200 | * @dev: AMBA device to register | |
201 | * @parent: parent memory resource | |
202 | * | |
203 | * Setup the AMBA device, reading the cell ID if present. | |
204 | * Claim the resource, and register the AMBA device with | |
205 | * the Linux device manager. | |
206 | */ | |
207 | int amba_device_register(struct amba_device *dev, struct resource *parent) | |
208 | { | |
209 | u32 pid, cid; | |
210 | void __iomem *tmp; | |
211 | int i, ret; | |
212 | ||
213 | dev->dev.release = amba_device_release; | |
214 | dev->dev.bus = &amba_bustype; | |
215 | dev->dev.dma_mask = &dev->dma_mask; | |
216 | dev->res.name = dev->dev.bus_id; | |
217 | ||
218 | if (!dev->dev.coherent_dma_mask && dev->dma_mask) | |
219 | dev_warn(&dev->dev, "coherent dma mask is unset\n"); | |
220 | ||
221 | ret = request_resource(parent, &dev->res); | |
96b13f5c RK |
222 | if (ret) |
223 | goto err_out; | |
224 | ||
225 | tmp = ioremap(dev->res.start, SZ_4K); | |
226 | if (!tmp) { | |
227 | ret = -ENOMEM; | |
228 | goto err_release; | |
1da177e4 | 229 | } |
96b13f5c RK |
230 | |
231 | for (pid = 0, i = 0; i < 4; i++) | |
232 | pid |= (readl(tmp + 0xfe0 + 4 * i) & 255) << (i * 8); | |
233 | for (cid = 0, i = 0; i < 4; i++) | |
234 | cid |= (readl(tmp + 0xff0 + 4 * i) & 255) << (i * 8); | |
235 | ||
236 | iounmap(tmp); | |
237 | ||
238 | if (cid == 0xb105f00d) | |
239 | dev->periphid = pid; | |
240 | ||
241 | if (!dev->periphid) { | |
242 | ret = -ENODEV; | |
243 | goto err_release; | |
244 | } | |
245 | ||
246 | ret = device_register(&dev->dev); | |
247 | if (ret) | |
248 | goto err_release; | |
249 | ||
250 | if (dev->irq[0] != NO_IRQ) | |
251 | ret = device_create_file(&dev->dev, &dev_attr_irq0); | |
252 | if (ret == 0 && dev->irq[1] != NO_IRQ) | |
253 | ret = device_create_file(&dev->dev, &dev_attr_irq1); | |
254 | if (ret == 0) | |
255 | return ret; | |
256 | ||
257 | device_unregister(&dev->dev); | |
258 | ||
259 | err_release: | |
260 | release_resource(&dev->res); | |
261 | err_out: | |
1da177e4 LT |
262 | return ret; |
263 | } | |
264 | ||
265 | /** | |
266 | * amba_device_unregister - unregister an AMBA device | |
267 | * @dev: AMBA device to remove | |
268 | * | |
269 | * Remove the specified AMBA device from the Linux device | |
270 | * manager. All files associated with this object will be | |
271 | * destroyed, and device drivers notified that the device has | |
272 | * been removed. The AMBA device's resources including | |
273 | * the amba_device structure will be freed once all | |
274 | * references to it have been dropped. | |
275 | */ | |
276 | void amba_device_unregister(struct amba_device *dev) | |
277 | { | |
278 | device_unregister(&dev->dev); | |
279 | } | |
280 | ||
281 | ||
282 | struct find_data { | |
283 | struct amba_device *dev; | |
284 | struct device *parent; | |
285 | const char *busid; | |
286 | unsigned int id; | |
287 | unsigned int mask; | |
288 | }; | |
289 | ||
290 | static int amba_find_match(struct device *dev, void *data) | |
291 | { | |
292 | struct find_data *d = data; | |
293 | struct amba_device *pcdev = to_amba_device(dev); | |
294 | int r; | |
295 | ||
296 | r = (pcdev->periphid & d->mask) == d->id; | |
297 | if (d->parent) | |
298 | r &= d->parent == dev->parent; | |
299 | if (d->busid) | |
300 | r &= strcmp(dev->bus_id, d->busid) == 0; | |
301 | ||
302 | if (r) { | |
303 | get_device(dev); | |
304 | d->dev = pcdev; | |
305 | } | |
306 | ||
307 | return r; | |
308 | } | |
309 | ||
310 | /** | |
311 | * amba_find_device - locate an AMBA device given a bus id | |
312 | * @busid: bus id for device (or NULL) | |
313 | * @parent: parent device (or NULL) | |
314 | * @id: peripheral ID (or 0) | |
315 | * @mask: peripheral ID mask (or 0) | |
316 | * | |
317 | * Return the AMBA device corresponding to the supplied parameters. | |
318 | * If no device matches, returns NULL. | |
319 | * | |
320 | * NOTE: When a valid device is found, its refcount is | |
321 | * incremented, and must be decremented before the returned | |
322 | * reference. | |
323 | */ | |
324 | struct amba_device * | |
325 | amba_find_device(const char *busid, struct device *parent, unsigned int id, | |
326 | unsigned int mask) | |
327 | { | |
328 | struct find_data data; | |
329 | ||
330 | data.dev = NULL; | |
331 | data.parent = parent; | |
332 | data.busid = busid; | |
333 | data.id = id; | |
334 | data.mask = mask; | |
335 | ||
336 | bus_for_each_dev(&amba_bustype, NULL, &data, amba_find_match); | |
337 | ||
338 | return data.dev; | |
339 | } | |
340 | ||
341 | /** | |
342 | * amba_request_regions - request all mem regions associated with device | |
343 | * @dev: amba_device structure for device | |
344 | * @name: name, or NULL to use driver name | |
345 | */ | |
346 | int amba_request_regions(struct amba_device *dev, const char *name) | |
347 | { | |
348 | int ret = 0; | |
349 | ||
350 | if (!name) | |
351 | name = dev->dev.driver->name; | |
352 | ||
353 | if (!request_mem_region(dev->res.start, SZ_4K, name)) | |
354 | ret = -EBUSY; | |
355 | ||
356 | return ret; | |
357 | } | |
358 | ||
359 | /** | |
360 | * amba_release_regions - release mem regions assoicated with device | |
361 | * @dev: amba_device structure for device | |
362 | * | |
363 | * Release regions claimed by a successful call to amba_request_regions. | |
364 | */ | |
365 | void amba_release_regions(struct amba_device *dev) | |
366 | { | |
367 | release_mem_region(dev->res.start, SZ_4K); | |
368 | } | |
369 | ||
370 | EXPORT_SYMBOL(amba_driver_register); | |
371 | EXPORT_SYMBOL(amba_driver_unregister); | |
372 | EXPORT_SYMBOL(amba_device_register); | |
373 | EXPORT_SYMBOL(amba_device_unregister); | |
374 | EXPORT_SYMBOL(amba_find_device); | |
375 | EXPORT_SYMBOL(amba_request_regions); | |
376 | EXPORT_SYMBOL(amba_release_regions); |