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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> | |
13 | ||
14 | #include <asm/io.h> | |
15 | #include <asm/irq.h> | |
16 | #include <asm/hardware/amba.h> | |
17 | #include <asm/sizes.h> | |
18 | ||
19 | #define to_amba_device(d) container_of(d, struct amba_device, dev) | |
20 | #define to_amba_driver(d) container_of(d, struct amba_driver, drv) | |
21 | ||
22 | static struct amba_id * | |
23 | amba_lookup(struct amba_id *table, struct amba_device *dev) | |
24 | { | |
25 | int ret = 0; | |
26 | ||
27 | while (table->mask) { | |
28 | ret = (dev->periphid & table->mask) == table->id; | |
29 | if (ret) | |
30 | break; | |
31 | table++; | |
32 | } | |
33 | ||
34 | return ret ? table : NULL; | |
35 | } | |
36 | ||
37 | static int amba_match(struct device *dev, struct device_driver *drv) | |
38 | { | |
39 | struct amba_device *pcdev = to_amba_device(dev); | |
40 | struct amba_driver *pcdrv = to_amba_driver(drv); | |
41 | ||
42 | return amba_lookup(pcdrv->id_table, pcdev) != NULL; | |
43 | } | |
44 | ||
45 | #ifdef CONFIG_HOTPLUG | |
46 | static int amba_hotplug(struct device *dev, char **envp, int nr_env, char *buf, int bufsz) | |
47 | { | |
48 | struct amba_device *pcdev = to_amba_device(dev); | |
49 | ||
50 | if (nr_env < 2) | |
51 | return -ENOMEM; | |
52 | ||
53 | snprintf(buf, bufsz, "AMBA_ID=%08x", pcdev->periphid); | |
54 | *envp++ = buf; | |
55 | *envp++ = NULL; | |
56 | return 0; | |
57 | } | |
58 | #else | |
59 | #define amba_hotplug NULL | |
60 | #endif | |
61 | ||
62 | static int amba_suspend(struct device *dev, pm_message_t state) | |
63 | { | |
64 | struct amba_driver *drv = to_amba_driver(dev->driver); | |
65 | int ret = 0; | |
66 | ||
67 | if (dev->driver && drv->suspend) | |
68 | ret = drv->suspend(to_amba_device(dev), state); | |
69 | return ret; | |
70 | } | |
71 | ||
72 | static int amba_resume(struct device *dev) | |
73 | { | |
74 | struct amba_driver *drv = to_amba_driver(dev->driver); | |
75 | int ret = 0; | |
76 | ||
77 | if (dev->driver && drv->resume) | |
78 | ret = drv->resume(to_amba_device(dev)); | |
79 | return ret; | |
80 | } | |
81 | ||
82 | /* | |
83 | * Primecells are part of the Advanced Microcontroller Bus Architecture, | |
84 | * so we call the bus "amba". | |
85 | */ | |
86 | static struct bus_type amba_bustype = { | |
87 | .name = "amba", | |
88 | .match = amba_match, | |
89 | .hotplug = amba_hotplug, | |
90 | .suspend = amba_suspend, | |
91 | .resume = amba_resume, | |
92 | }; | |
93 | ||
94 | static int __init amba_init(void) | |
95 | { | |
96 | return bus_register(&amba_bustype); | |
97 | } | |
98 | ||
99 | postcore_initcall(amba_init); | |
100 | ||
101 | /* | |
102 | * These are the device model conversion veneers; they convert the | |
103 | * device model structures to our more specific structures. | |
104 | */ | |
105 | static int amba_probe(struct device *dev) | |
106 | { | |
107 | struct amba_device *pcdev = to_amba_device(dev); | |
108 | struct amba_driver *pcdrv = to_amba_driver(dev->driver); | |
109 | struct amba_id *id; | |
110 | ||
111 | id = amba_lookup(pcdrv->id_table, pcdev); | |
112 | ||
113 | return pcdrv->probe(pcdev, id); | |
114 | } | |
115 | ||
116 | static int amba_remove(struct device *dev) | |
117 | { | |
118 | struct amba_driver *drv = to_amba_driver(dev->driver); | |
119 | return drv->remove(to_amba_device(dev)); | |
120 | } | |
121 | ||
122 | static void amba_shutdown(struct device *dev) | |
123 | { | |
124 | struct amba_driver *drv = to_amba_driver(dev->driver); | |
125 | drv->shutdown(to_amba_device(dev)); | |
126 | } | |
127 | ||
128 | /** | |
129 | * amba_driver_register - register an AMBA device driver | |
130 | * @drv: amba device driver structure | |
131 | * | |
132 | * Register an AMBA device driver with the Linux device model | |
133 | * core. If devices pre-exist, the drivers probe function will | |
134 | * be called. | |
135 | */ | |
136 | int amba_driver_register(struct amba_driver *drv) | |
137 | { | |
138 | drv->drv.bus = &amba_bustype; | |
139 | ||
140 | #define SETFN(fn) if (drv->fn) drv->drv.fn = amba_##fn | |
141 | SETFN(probe); | |
142 | SETFN(remove); | |
143 | SETFN(shutdown); | |
144 | ||
145 | return driver_register(&drv->drv); | |
146 | } | |
147 | ||
148 | /** | |
149 | * amba_driver_unregister - remove an AMBA device driver | |
150 | * @drv: AMBA device driver structure to remove | |
151 | * | |
152 | * Unregister an AMBA device driver from the Linux device | |
153 | * model. The device model will call the drivers remove function | |
154 | * for each device the device driver is currently handling. | |
155 | */ | |
156 | void amba_driver_unregister(struct amba_driver *drv) | |
157 | { | |
158 | driver_unregister(&drv->drv); | |
159 | } | |
160 | ||
161 | ||
162 | static void amba_device_release(struct device *dev) | |
163 | { | |
164 | struct amba_device *d = to_amba_device(dev); | |
165 | ||
166 | if (d->res.parent) | |
167 | release_resource(&d->res); | |
168 | kfree(d); | |
169 | } | |
170 | ||
171 | #define amba_attr(name,fmt,arg...) \ | |
ff381d22 | 172 | static ssize_t show_##name(struct device *_dev, struct device_attribute *attr, char *buf) \ |
1da177e4 LT |
173 | { \ |
174 | struct amba_device *dev = to_amba_device(_dev); \ | |
175 | return sprintf(buf, fmt, arg); \ | |
176 | } \ | |
177 | static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL) | |
178 | ||
179 | amba_attr(id, "%08x\n", dev->periphid); | |
180 | amba_attr(irq0, "%u\n", dev->irq[0]); | |
181 | amba_attr(irq1, "%u\n", dev->irq[1]); | |
182 | amba_attr(resource, "\t%08lx\t%08lx\t%08lx\n", | |
183 | dev->res.start, dev->res.end, dev->res.flags); | |
184 | ||
185 | /** | |
186 | * amba_device_register - register an AMBA device | |
187 | * @dev: AMBA device to register | |
188 | * @parent: parent memory resource | |
189 | * | |
190 | * Setup the AMBA device, reading the cell ID if present. | |
191 | * Claim the resource, and register the AMBA device with | |
192 | * the Linux device manager. | |
193 | */ | |
194 | int amba_device_register(struct amba_device *dev, struct resource *parent) | |
195 | { | |
196 | u32 pid, cid; | |
197 | void __iomem *tmp; | |
198 | int i, ret; | |
199 | ||
200 | dev->dev.release = amba_device_release; | |
201 | dev->dev.bus = &amba_bustype; | |
202 | dev->dev.dma_mask = &dev->dma_mask; | |
203 | dev->res.name = dev->dev.bus_id; | |
204 | ||
205 | if (!dev->dev.coherent_dma_mask && dev->dma_mask) | |
206 | dev_warn(&dev->dev, "coherent dma mask is unset\n"); | |
207 | ||
208 | ret = request_resource(parent, &dev->res); | |
209 | if (ret == 0) { | |
210 | tmp = ioremap(dev->res.start, SZ_4K); | |
211 | if (!tmp) { | |
212 | ret = -ENOMEM; | |
213 | goto out; | |
214 | } | |
215 | ||
216 | for (pid = 0, i = 0; i < 4; i++) | |
217 | pid |= (readl(tmp + 0xfe0 + 4 * i) & 255) << (i * 8); | |
218 | for (cid = 0, i = 0; i < 4; i++) | |
219 | cid |= (readl(tmp + 0xff0 + 4 * i) & 255) << (i * 8); | |
220 | ||
221 | iounmap(tmp); | |
222 | ||
223 | if (cid == 0xb105f00d) | |
224 | dev->periphid = pid; | |
225 | ||
226 | if (dev->periphid) | |
227 | ret = device_register(&dev->dev); | |
228 | else | |
229 | ret = -ENODEV; | |
230 | ||
231 | if (ret == 0) { | |
232 | device_create_file(&dev->dev, &dev_attr_id); | |
233 | if (dev->irq[0] != NO_IRQ) | |
234 | device_create_file(&dev->dev, &dev_attr_irq0); | |
235 | if (dev->irq[1] != NO_IRQ) | |
236 | device_create_file(&dev->dev, &dev_attr_irq1); | |
237 | device_create_file(&dev->dev, &dev_attr_resource); | |
238 | } else { | |
239 | out: | |
240 | release_resource(&dev->res); | |
241 | } | |
242 | } | |
243 | return ret; | |
244 | } | |
245 | ||
246 | /** | |
247 | * amba_device_unregister - unregister an AMBA device | |
248 | * @dev: AMBA device to remove | |
249 | * | |
250 | * Remove the specified AMBA device from the Linux device | |
251 | * manager. All files associated with this object will be | |
252 | * destroyed, and device drivers notified that the device has | |
253 | * been removed. The AMBA device's resources including | |
254 | * the amba_device structure will be freed once all | |
255 | * references to it have been dropped. | |
256 | */ | |
257 | void amba_device_unregister(struct amba_device *dev) | |
258 | { | |
259 | device_unregister(&dev->dev); | |
260 | } | |
261 | ||
262 | ||
263 | struct find_data { | |
264 | struct amba_device *dev; | |
265 | struct device *parent; | |
266 | const char *busid; | |
267 | unsigned int id; | |
268 | unsigned int mask; | |
269 | }; | |
270 | ||
271 | static int amba_find_match(struct device *dev, void *data) | |
272 | { | |
273 | struct find_data *d = data; | |
274 | struct amba_device *pcdev = to_amba_device(dev); | |
275 | int r; | |
276 | ||
277 | r = (pcdev->periphid & d->mask) == d->id; | |
278 | if (d->parent) | |
279 | r &= d->parent == dev->parent; | |
280 | if (d->busid) | |
281 | r &= strcmp(dev->bus_id, d->busid) == 0; | |
282 | ||
283 | if (r) { | |
284 | get_device(dev); | |
285 | d->dev = pcdev; | |
286 | } | |
287 | ||
288 | return r; | |
289 | } | |
290 | ||
291 | /** | |
292 | * amba_find_device - locate an AMBA device given a bus id | |
293 | * @busid: bus id for device (or NULL) | |
294 | * @parent: parent device (or NULL) | |
295 | * @id: peripheral ID (or 0) | |
296 | * @mask: peripheral ID mask (or 0) | |
297 | * | |
298 | * Return the AMBA device corresponding to the supplied parameters. | |
299 | * If no device matches, returns NULL. | |
300 | * | |
301 | * NOTE: When a valid device is found, its refcount is | |
302 | * incremented, and must be decremented before the returned | |
303 | * reference. | |
304 | */ | |
305 | struct amba_device * | |
306 | amba_find_device(const char *busid, struct device *parent, unsigned int id, | |
307 | unsigned int mask) | |
308 | { | |
309 | struct find_data data; | |
310 | ||
311 | data.dev = NULL; | |
312 | data.parent = parent; | |
313 | data.busid = busid; | |
314 | data.id = id; | |
315 | data.mask = mask; | |
316 | ||
317 | bus_for_each_dev(&amba_bustype, NULL, &data, amba_find_match); | |
318 | ||
319 | return data.dev; | |
320 | } | |
321 | ||
322 | /** | |
323 | * amba_request_regions - request all mem regions associated with device | |
324 | * @dev: amba_device structure for device | |
325 | * @name: name, or NULL to use driver name | |
326 | */ | |
327 | int amba_request_regions(struct amba_device *dev, const char *name) | |
328 | { | |
329 | int ret = 0; | |
330 | ||
331 | if (!name) | |
332 | name = dev->dev.driver->name; | |
333 | ||
334 | if (!request_mem_region(dev->res.start, SZ_4K, name)) | |
335 | ret = -EBUSY; | |
336 | ||
337 | return ret; | |
338 | } | |
339 | ||
340 | /** | |
341 | * amba_release_regions - release mem regions assoicated with device | |
342 | * @dev: amba_device structure for device | |
343 | * | |
344 | * Release regions claimed by a successful call to amba_request_regions. | |
345 | */ | |
346 | void amba_release_regions(struct amba_device *dev) | |
347 | { | |
348 | release_mem_region(dev->res.start, SZ_4K); | |
349 | } | |
350 | ||
351 | EXPORT_SYMBOL(amba_driver_register); | |
352 | EXPORT_SYMBOL(amba_driver_unregister); | |
353 | EXPORT_SYMBOL(amba_device_register); | |
354 | EXPORT_SYMBOL(amba_device_unregister); | |
355 | EXPORT_SYMBOL(amba_find_device); | |
356 | EXPORT_SYMBOL(amba_request_regions); | |
357 | EXPORT_SYMBOL(amba_release_regions); |