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1da177e4 LT |
1 | /* |
2 | * platform.c - platform 'pseudo' bus for legacy devices | |
3 | * | |
4 | * Copyright (c) 2002-3 Patrick Mochel | |
5 | * Copyright (c) 2002-3 Open Source Development Labs | |
6 | * | |
7 | * This file is released under the GPLv2 | |
8 | * | |
9 | * Please see Documentation/driver-model/platform.txt for more | |
10 | * information. | |
11 | */ | |
12 | ||
13 | #include <linux/device.h> | |
14 | #include <linux/module.h> | |
15 | #include <linux/init.h> | |
16 | #include <linux/dma-mapping.h> | |
17 | #include <linux/bootmem.h> | |
18 | #include <linux/err.h> | |
19 | ||
20 | struct device platform_bus = { | |
21 | .bus_id = "platform", | |
22 | }; | |
23 | ||
24 | /** | |
25 | * platform_get_resource - get a resource for a device | |
26 | * @dev: platform device | |
27 | * @type: resource type | |
28 | * @num: resource index | |
29 | */ | |
30 | struct resource * | |
31 | platform_get_resource(struct platform_device *dev, unsigned int type, | |
32 | unsigned int num) | |
33 | { | |
34 | int i; | |
35 | ||
36 | for (i = 0; i < dev->num_resources; i++) { | |
37 | struct resource *r = &dev->resource[i]; | |
38 | ||
39 | if ((r->flags & (IORESOURCE_IO|IORESOURCE_MEM| | |
40 | IORESOURCE_IRQ|IORESOURCE_DMA)) | |
41 | == type) | |
42 | if (num-- == 0) | |
43 | return r; | |
44 | } | |
45 | return NULL; | |
46 | } | |
47 | ||
48 | /** | |
49 | * platform_get_irq - get an IRQ for a device | |
50 | * @dev: platform device | |
51 | * @num: IRQ number index | |
52 | */ | |
53 | int platform_get_irq(struct platform_device *dev, unsigned int num) | |
54 | { | |
55 | struct resource *r = platform_get_resource(dev, IORESOURCE_IRQ, num); | |
56 | ||
57 | return r ? r->start : 0; | |
58 | } | |
59 | ||
60 | /** | |
61 | * platform_get_resource_byname - get a resource for a device by name | |
62 | * @dev: platform device | |
63 | * @type: resource type | |
64 | * @name: resource name | |
65 | */ | |
66 | struct resource * | |
67 | platform_get_resource_byname(struct platform_device *dev, unsigned int type, | |
68 | char *name) | |
69 | { | |
70 | int i; | |
71 | ||
72 | for (i = 0; i < dev->num_resources; i++) { | |
73 | struct resource *r = &dev->resource[i]; | |
74 | ||
75 | if ((r->flags & (IORESOURCE_IO|IORESOURCE_MEM| | |
76 | IORESOURCE_IRQ|IORESOURCE_DMA)) == type) | |
77 | if (!strcmp(r->name, name)) | |
78 | return r; | |
79 | } | |
80 | return NULL; | |
81 | } | |
82 | ||
83 | /** | |
84 | * platform_get_irq - get an IRQ for a device | |
85 | * @dev: platform device | |
86 | * @name: IRQ name | |
87 | */ | |
88 | int platform_get_irq_byname(struct platform_device *dev, char *name) | |
89 | { | |
90 | struct resource *r = platform_get_resource_byname(dev, IORESOURCE_IRQ, name); | |
91 | ||
92 | return r ? r->start : 0; | |
93 | } | |
94 | ||
95 | /** | |
96 | * platform_add_devices - add a numbers of platform devices | |
97 | * @devs: array of platform devices to add | |
98 | * @num: number of platform devices in array | |
99 | */ | |
100 | int platform_add_devices(struct platform_device **devs, int num) | |
101 | { | |
102 | int i, ret = 0; | |
103 | ||
104 | for (i = 0; i < num; i++) { | |
105 | ret = platform_device_register(devs[i]); | |
106 | if (ret) { | |
107 | while (--i >= 0) | |
108 | platform_device_unregister(devs[i]); | |
109 | break; | |
110 | } | |
111 | } | |
112 | ||
113 | return ret; | |
114 | } | |
115 | ||
116 | /** | |
117 | * platform_device_register - add a platform-level device | |
67be2dd1 | 118 | * @pdev: platform device we're adding |
1da177e4 LT |
119 | * |
120 | */ | |
121 | int platform_device_register(struct platform_device * pdev) | |
122 | { | |
123 | int i, ret = 0; | |
124 | ||
125 | if (!pdev) | |
126 | return -EINVAL; | |
127 | ||
128 | if (!pdev->dev.parent) | |
129 | pdev->dev.parent = &platform_bus; | |
130 | ||
131 | pdev->dev.bus = &platform_bus_type; | |
132 | ||
133 | if (pdev->id != -1) | |
134 | snprintf(pdev->dev.bus_id, BUS_ID_SIZE, "%s.%u", pdev->name, pdev->id); | |
135 | else | |
136 | strlcpy(pdev->dev.bus_id, pdev->name, BUS_ID_SIZE); | |
137 | ||
138 | for (i = 0; i < pdev->num_resources; i++) { | |
139 | struct resource *p, *r = &pdev->resource[i]; | |
140 | ||
141 | if (r->name == NULL) | |
142 | r->name = pdev->dev.bus_id; | |
143 | ||
144 | p = r->parent; | |
145 | if (!p) { | |
146 | if (r->flags & IORESOURCE_MEM) | |
147 | p = &iomem_resource; | |
148 | else if (r->flags & IORESOURCE_IO) | |
149 | p = &ioport_resource; | |
150 | } | |
151 | ||
152 | if (p && request_resource(p, r)) { | |
153 | printk(KERN_ERR | |
154 | "%s: failed to claim resource %d\n", | |
155 | pdev->dev.bus_id, i); | |
156 | ret = -EBUSY; | |
157 | goto failed; | |
158 | } | |
159 | } | |
160 | ||
161 | pr_debug("Registering platform device '%s'. Parent at %s\n", | |
162 | pdev->dev.bus_id, pdev->dev.parent->bus_id); | |
163 | ||
164 | ret = device_register(&pdev->dev); | |
165 | if (ret == 0) | |
166 | return ret; | |
167 | ||
168 | failed: | |
169 | while (--i >= 0) | |
170 | if (pdev->resource[i].flags & (IORESOURCE_MEM|IORESOURCE_IO)) | |
171 | release_resource(&pdev->resource[i]); | |
172 | return ret; | |
173 | } | |
174 | ||
175 | /** | |
176 | * platform_device_unregister - remove a platform-level device | |
67be2dd1 | 177 | * @pdev: platform device we're removing |
1da177e4 LT |
178 | * |
179 | * Note that this function will also release all memory- and port-based | |
180 | * resources owned by the device (@dev->resource). | |
181 | */ | |
182 | void platform_device_unregister(struct platform_device * pdev) | |
183 | { | |
184 | int i; | |
185 | ||
186 | if (pdev) { | |
187 | for (i = 0; i < pdev->num_resources; i++) { | |
188 | struct resource *r = &pdev->resource[i]; | |
189 | if (r->flags & (IORESOURCE_MEM|IORESOURCE_IO)) | |
190 | release_resource(r); | |
191 | } | |
192 | ||
193 | device_unregister(&pdev->dev); | |
194 | } | |
195 | } | |
196 | ||
197 | struct platform_object { | |
198 | struct platform_device pdev; | |
199 | struct resource resources[0]; | |
200 | }; | |
201 | ||
202 | static void platform_device_release_simple(struct device *dev) | |
203 | { | |
204 | struct platform_device *pdev = to_platform_device(dev); | |
205 | ||
206 | kfree(container_of(pdev, struct platform_object, pdev)); | |
207 | } | |
208 | ||
209 | /** | |
210 | * platform_device_register_simple | |
211 | * @name: base name of the device we're adding | |
212 | * @id: instance id | |
213 | * @res: set of resources that needs to be allocated for the device | |
214 | * @num: number of resources | |
215 | * | |
216 | * This function creates a simple platform device that requires minimal | |
217 | * resource and memory management. Canned release function freeing | |
218 | * memory allocated for the device allows drivers using such devices | |
219 | * to be unloaded iwithout waiting for the last reference to the device | |
220 | * to be dropped. | |
221 | */ | |
222 | struct platform_device *platform_device_register_simple(char *name, unsigned int id, | |
223 | struct resource *res, unsigned int num) | |
224 | { | |
225 | struct platform_object *pobj; | |
226 | int retval; | |
227 | ||
228 | pobj = kmalloc(sizeof(struct platform_object) + sizeof(struct resource) * num, GFP_KERNEL); | |
229 | if (!pobj) { | |
230 | retval = -ENOMEM; | |
231 | goto error; | |
232 | } | |
233 | ||
234 | memset(pobj, 0, sizeof(*pobj)); | |
235 | pobj->pdev.name = name; | |
236 | pobj->pdev.id = id; | |
237 | pobj->pdev.dev.release = platform_device_release_simple; | |
238 | ||
239 | if (num) { | |
240 | memcpy(pobj->resources, res, sizeof(struct resource) * num); | |
241 | pobj->pdev.resource = pobj->resources; | |
242 | pobj->pdev.num_resources = num; | |
243 | } | |
244 | ||
245 | retval = platform_device_register(&pobj->pdev); | |
246 | if (retval) | |
247 | goto error; | |
248 | ||
249 | return &pobj->pdev; | |
250 | ||
251 | error: | |
252 | kfree(pobj); | |
253 | return ERR_PTR(retval); | |
254 | } | |
255 | ||
256 | ||
257 | /** | |
258 | * platform_match - bind platform device to platform driver. | |
259 | * @dev: device. | |
260 | * @drv: driver. | |
261 | * | |
262 | * Platform device IDs are assumed to be encoded like this: | |
263 | * "<name><instance>", where <name> is a short description of the | |
264 | * type of device, like "pci" or "floppy", and <instance> is the | |
265 | * enumerated instance of the device, like '0' or '42'. | |
266 | * Driver IDs are simply "<name>". | |
267 | * So, extract the <name> from the platform_device structure, | |
268 | * and compare it against the name of the driver. Return whether | |
269 | * they match or not. | |
270 | */ | |
271 | ||
272 | static int platform_match(struct device * dev, struct device_driver * drv) | |
273 | { | |
274 | struct platform_device *pdev = container_of(dev, struct platform_device, dev); | |
275 | ||
276 | return (strncmp(pdev->name, drv->name, BUS_ID_SIZE) == 0); | |
277 | } | |
278 | ||
279 | static int platform_suspend(struct device * dev, pm_message_t state) | |
280 | { | |
281 | int ret = 0; | |
282 | ||
283 | if (dev->driver && dev->driver->suspend) { | |
284 | ret = dev->driver->suspend(dev, state, SUSPEND_DISABLE); | |
285 | if (ret == 0) | |
286 | ret = dev->driver->suspend(dev, state, SUSPEND_SAVE_STATE); | |
287 | if (ret == 0) | |
288 | ret = dev->driver->suspend(dev, state, SUSPEND_POWER_DOWN); | |
289 | } | |
290 | return ret; | |
291 | } | |
292 | ||
293 | static int platform_resume(struct device * dev) | |
294 | { | |
295 | int ret = 0; | |
296 | ||
297 | if (dev->driver && dev->driver->resume) { | |
298 | ret = dev->driver->resume(dev, RESUME_POWER_ON); | |
299 | if (ret == 0) | |
300 | ret = dev->driver->resume(dev, RESUME_RESTORE_STATE); | |
301 | if (ret == 0) | |
302 | ret = dev->driver->resume(dev, RESUME_ENABLE); | |
303 | } | |
304 | return ret; | |
305 | } | |
306 | ||
307 | struct bus_type platform_bus_type = { | |
308 | .name = "platform", | |
309 | .match = platform_match, | |
310 | .suspend = platform_suspend, | |
311 | .resume = platform_resume, | |
312 | }; | |
313 | ||
314 | int __init platform_bus_init(void) | |
315 | { | |
316 | device_register(&platform_bus); | |
317 | return bus_register(&platform_bus_type); | |
318 | } | |
319 | ||
320 | #ifndef ARCH_HAS_DMA_GET_REQUIRED_MASK | |
321 | u64 dma_get_required_mask(struct device *dev) | |
322 | { | |
323 | u32 low_totalram = ((max_pfn - 1) << PAGE_SHIFT); | |
324 | u32 high_totalram = ((max_pfn - 1) >> (32 - PAGE_SHIFT)); | |
325 | u64 mask; | |
326 | ||
327 | if (!high_totalram) { | |
328 | /* convert to mask just covering totalram */ | |
329 | low_totalram = (1 << (fls(low_totalram) - 1)); | |
330 | low_totalram += low_totalram - 1; | |
331 | mask = low_totalram; | |
332 | } else { | |
333 | high_totalram = (1 << (fls(high_totalram) - 1)); | |
334 | high_totalram += high_totalram - 1; | |
335 | mask = (((u64)high_totalram) << 32) + 0xffffffff; | |
336 | } | |
337 | return mask & *dev->dma_mask; | |
338 | } | |
339 | EXPORT_SYMBOL_GPL(dma_get_required_mask); | |
340 | #endif | |
341 | ||
342 | EXPORT_SYMBOL_GPL(platform_bus); | |
343 | EXPORT_SYMBOL_GPL(platform_bus_type); | |
46ea0d6c | 344 | EXPORT_SYMBOL_GPL(platform_add_devices); |
1da177e4 LT |
345 | EXPORT_SYMBOL_GPL(platform_device_register); |
346 | EXPORT_SYMBOL_GPL(platform_device_register_simple); | |
347 | EXPORT_SYMBOL_GPL(platform_device_unregister); | |
348 | EXPORT_SYMBOL_GPL(platform_get_irq); | |
349 | EXPORT_SYMBOL_GPL(platform_get_resource); | |
350 | EXPORT_SYMBOL_GPL(platform_get_irq_byname); | |
351 | EXPORT_SYMBOL_GPL(platform_get_resource_byname); |