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1da177e4 LT |
1 | /* |
2 | * Functions to handle I2O drivers (OSMs) and I2O bus type for sysfs | |
3 | * | |
4 | * Copyright (C) 2004 Markus Lidel <Markus.Lidel@shadowconnect.com> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify it | |
7 | * under the terms of the GNU General Public License as published by the | |
8 | * Free Software Foundation; either version 2 of the License, or (at your | |
9 | * option) any later version. | |
10 | * | |
11 | * Fixes/additions: | |
12 | * Markus Lidel <Markus.Lidel@shadowconnect.com> | |
13 | * initial version. | |
14 | */ | |
15 | ||
16 | #include <linux/device.h> | |
17 | #include <linux/module.h> | |
18 | #include <linux/rwsem.h> | |
19 | #include <linux/i2o.h> | |
20 | ||
61fbfa81 ML |
21 | #define OSM_NAME "core" |
22 | ||
1da177e4 LT |
23 | /* max_drivers - Maximum I2O drivers (OSMs) which could be registered */ |
24 | unsigned int i2o_max_drivers = I2O_MAX_DRIVERS; | |
25 | module_param_named(max_drivers, i2o_max_drivers, uint, 0); | |
26 | MODULE_PARM_DESC(max_drivers, "maximum number of OSM's to support"); | |
27 | ||
28 | /* I2O drivers lock and array */ | |
29 | static spinlock_t i2o_drivers_lock; | |
30 | static struct i2o_driver **i2o_drivers; | |
31 | ||
32 | /** | |
33 | * i2o_bus_match - Tell if a I2O device class id match the class ids of | |
34 | * the I2O driver (OSM) | |
35 | * | |
36 | * @dev: device which should be verified | |
37 | * @drv: the driver to match against | |
38 | * | |
39 | * Used by the bus to check if the driver wants to handle the device. | |
40 | * | |
41 | * Returns 1 if the class ids of the driver match the class id of the | |
42 | * device, otherwise 0. | |
43 | */ | |
44 | static int i2o_bus_match(struct device *dev, struct device_driver *drv) | |
45 | { | |
46 | struct i2o_device *i2o_dev = to_i2o_device(dev); | |
47 | struct i2o_driver *i2o_drv = to_i2o_driver(drv); | |
48 | struct i2o_class_id *ids = i2o_drv->classes; | |
49 | ||
50 | if (ids) | |
51 | while (ids->class_id != I2O_CLASS_END) { | |
52 | if (ids->class_id == i2o_dev->lct_data.class_id) | |
53 | return 1; | |
54 | ids++; | |
55 | } | |
56 | return 0; | |
57 | }; | |
58 | ||
59 | /* I2O bus type */ | |
60 | struct bus_type i2o_bus_type = { | |
61 | .name = "i2o", | |
62 | .match = i2o_bus_match, | |
63 | }; | |
64 | ||
65 | /** | |
66 | * i2o_driver_register - Register a I2O driver (OSM) in the I2O core | |
67 | * @drv: I2O driver which should be registered | |
68 | * | |
69 | * Registers the OSM drv in the I2O core and creates an event queues if | |
70 | * necessary. | |
71 | * | |
72 | * Returns 0 on success or negative error code on failure. | |
73 | */ | |
74 | int i2o_driver_register(struct i2o_driver *drv) | |
75 | { | |
76 | struct i2o_controller *c; | |
77 | int i; | |
78 | int rc = 0; | |
79 | unsigned long flags; | |
80 | ||
81 | pr_debug("i2o: Register driver %s\n", drv->name); | |
82 | ||
83 | if (drv->event) { | |
84 | drv->event_queue = create_workqueue(drv->name); | |
85 | if (!drv->event_queue) { | |
86 | printk(KERN_ERR "i2o: Could not initialize event queue " | |
87 | "for driver %s\n", drv->name); | |
88 | return -EFAULT; | |
89 | } | |
90 | pr_debug("i2o: Event queue initialized for driver %s\n", | |
91 | drv->name); | |
92 | } else | |
93 | drv->event_queue = NULL; | |
94 | ||
95 | drv->driver.name = drv->name; | |
96 | drv->driver.bus = &i2o_bus_type; | |
97 | ||
98 | spin_lock_irqsave(&i2o_drivers_lock, flags); | |
99 | ||
100 | for (i = 0; i2o_drivers[i]; i++) | |
101 | if (i >= i2o_max_drivers) { | |
102 | printk(KERN_ERR "i2o: too many drivers registered, " | |
103 | "increase max_drivers\n"); | |
104 | spin_unlock_irqrestore(&i2o_drivers_lock, flags); | |
105 | return -EFAULT; | |
106 | } | |
107 | ||
108 | drv->context = i; | |
109 | i2o_drivers[i] = drv; | |
110 | ||
111 | spin_unlock_irqrestore(&i2o_drivers_lock, flags); | |
112 | ||
113 | pr_debug("i2o: driver %s gets context id %d\n", drv->name, | |
114 | drv->context); | |
115 | ||
116 | list_for_each_entry(c, &i2o_controllers, list) { | |
117 | struct i2o_device *i2o_dev; | |
118 | ||
119 | i2o_driver_notify_controller_add(drv, c); | |
120 | list_for_each_entry(i2o_dev, &c->devices, list) | |
121 | i2o_driver_notify_device_add(drv, i2o_dev); | |
122 | } | |
123 | ||
124 | ||
125 | rc = driver_register(&drv->driver); | |
126 | if (rc) | |
127 | destroy_workqueue(drv->event_queue); | |
128 | ||
129 | return rc; | |
130 | }; | |
131 | ||
132 | /** | |
133 | * i2o_driver_unregister - Unregister a I2O driver (OSM) from the I2O core | |
134 | * @drv: I2O driver which should be unregistered | |
135 | * | |
136 | * Unregisters the OSM drv from the I2O core and cleanup event queues if | |
137 | * necessary. | |
138 | */ | |
139 | void i2o_driver_unregister(struct i2o_driver *drv) | |
140 | { | |
141 | struct i2o_controller *c; | |
142 | unsigned long flags; | |
143 | ||
144 | pr_debug("i2o: unregister driver %s\n", drv->name); | |
145 | ||
146 | driver_unregister(&drv->driver); | |
147 | ||
148 | list_for_each_entry(c, &i2o_controllers, list) { | |
149 | struct i2o_device *i2o_dev; | |
150 | ||
151 | list_for_each_entry(i2o_dev, &c->devices, list) | |
152 | i2o_driver_notify_device_remove(drv, i2o_dev); | |
153 | ||
154 | i2o_driver_notify_controller_remove(drv, c); | |
155 | } | |
156 | ||
157 | spin_lock_irqsave(&i2o_drivers_lock, flags); | |
158 | i2o_drivers[drv->context] = NULL; | |
159 | spin_unlock_irqrestore(&i2o_drivers_lock, flags); | |
160 | ||
161 | if (drv->event_queue) { | |
162 | destroy_workqueue(drv->event_queue); | |
163 | drv->event_queue = NULL; | |
164 | pr_debug("i2o: event queue removed for %s\n", drv->name); | |
165 | } | |
166 | }; | |
167 | ||
168 | /** | |
169 | * i2o_driver_dispatch - dispatch an I2O reply message | |
170 | * @c: I2O controller of the message | |
171 | * @m: I2O message number | |
172 | * @msg: I2O message to be delivered | |
173 | * | |
174 | * The reply is delivered to the driver from which the original message | |
175 | * was. This function is only called from interrupt context. | |
176 | * | |
177 | * Returns 0 on success and the message should not be flushed. Returns > 0 | |
178 | * on success and if the message should be flushed afterwords. Returns | |
179 | * negative error code on failure (the message will be flushed too). | |
180 | */ | |
181 | int i2o_driver_dispatch(struct i2o_controller *c, u32 m, | |
182 | struct i2o_message __iomem *msg) | |
183 | { | |
184 | struct i2o_driver *drv; | |
185 | u32 context = readl(&msg->u.s.icntxt); | |
186 | ||
61fbfa81 ML |
187 | if (unlikely(context >= i2o_max_drivers)) { |
188 | printk(KERN_WARNING "%s: Spurious reply to unknown driver " | |
189 | "%d\n", c->name, readl(&msg->u.s.icntxt)); | |
190 | return -EIO; | |
191 | } | |
1da177e4 | 192 | |
61fbfa81 ML |
193 | spin_lock(&i2o_drivers_lock); |
194 | drv = i2o_drivers[context]; | |
195 | spin_unlock(&i2o_drivers_lock); | |
1da177e4 | 196 | |
61fbfa81 ML |
197 | if (unlikely(!drv)) { |
198 | osm_warn("Spurious reply to unknown driver %d\n", context); | |
199 | return -EIO; | |
200 | } | |
1da177e4 | 201 | |
61fbfa81 ML |
202 | if ((readl(&msg->u.head[1]) >> 24) == I2O_CMD_UTIL_EVT_REGISTER) { |
203 | struct i2o_device *dev, *tmp; | |
204 | struct i2o_event *evt; | |
205 | u16 size; | |
206 | u16 tid = readl(&msg->u.head[1]) & 0xfff; | |
1da177e4 | 207 | |
61fbfa81 | 208 | osm_debug("event received from device %d\n", tid); |
1da177e4 | 209 | |
61fbfa81 ML |
210 | /* cut of header from message size (in 32-bit words) */ |
211 | size = (readl(&msg->u.head[0]) >> 16) - 5; | |
1da177e4 | 212 | |
61fbfa81 ML |
213 | evt = kmalloc(size * 4 + sizeof(*evt), GFP_ATOMIC | __GFP_ZERO); |
214 | if (!evt) | |
215 | return -ENOMEM; | |
1da177e4 | 216 | |
61fbfa81 ML |
217 | evt->size = size; |
218 | evt->tcntxt = readl(&msg->u.s.tcntxt); | |
219 | evt->event_indicator = readl(&msg->body[0]); | |
220 | memcpy_fromio(&evt->tcntxt, &msg->u.s.tcntxt, size * 4); | |
1da177e4 | 221 | |
61fbfa81 ML |
222 | list_for_each_entry_safe(dev, tmp, &c->devices, list) |
223 | if (dev->lct_data.tid == tid) { | |
224 | evt->i2o_dev = dev; | |
225 | break; | |
1da177e4 LT |
226 | } |
227 | ||
61fbfa81 ML |
228 | INIT_WORK(&evt->work, (void (*)(void *))drv->event, evt); |
229 | queue_work(drv->event_queue, &evt->work); | |
230 | return 1; | |
231 | } | |
232 | ||
233 | if (unlikely(!drv->reply)) { | |
234 | pr_debug("%s: Reply to driver %s, but no reply function" | |
235 | " defined!\n", c->name, drv->name); | |
1da177e4 | 236 | return -EIO; |
61fbfa81 ML |
237 | } |
238 | ||
239 | return drv->reply(c, m, msg); | |
1da177e4 LT |
240 | } |
241 | ||
242 | /** | |
243 | * i2o_driver_notify_controller_add_all - Send notify of added controller | |
244 | * to all I2O drivers | |
245 | * | |
246 | * Send notifications to all registered drivers that a new controller was | |
247 | * added. | |
248 | */ | |
249 | void i2o_driver_notify_controller_add_all(struct i2o_controller *c) | |
250 | { | |
251 | int i; | |
252 | struct i2o_driver *drv; | |
253 | ||
254 | for (i = 0; i < I2O_MAX_DRIVERS; i++) { | |
255 | drv = i2o_drivers[i]; | |
256 | ||
257 | if (drv) | |
258 | i2o_driver_notify_controller_add(drv, c); | |
259 | } | |
260 | } | |
261 | ||
262 | /** | |
263 | * i2o_driver_notify_controller_remove_all - Send notify of removed | |
264 | * controller to all I2O drivers | |
265 | * | |
266 | * Send notifications to all registered drivers that a controller was | |
267 | * removed. | |
268 | */ | |
269 | void i2o_driver_notify_controller_remove_all(struct i2o_controller *c) | |
270 | { | |
271 | int i; | |
272 | struct i2o_driver *drv; | |
273 | ||
274 | for (i = 0; i < I2O_MAX_DRIVERS; i++) { | |
275 | drv = i2o_drivers[i]; | |
276 | ||
277 | if (drv) | |
278 | i2o_driver_notify_controller_remove(drv, c); | |
279 | } | |
280 | } | |
281 | ||
282 | /** | |
283 | * i2o_driver_notify_device_add_all - Send notify of added device to all | |
284 | * I2O drivers | |
285 | * | |
286 | * Send notifications to all registered drivers that a device was added. | |
287 | */ | |
288 | void i2o_driver_notify_device_add_all(struct i2o_device *i2o_dev) | |
289 | { | |
290 | int i; | |
291 | struct i2o_driver *drv; | |
292 | ||
293 | for (i = 0; i < I2O_MAX_DRIVERS; i++) { | |
294 | drv = i2o_drivers[i]; | |
295 | ||
296 | if (drv) | |
297 | i2o_driver_notify_device_add(drv, i2o_dev); | |
298 | } | |
299 | } | |
300 | ||
301 | /** | |
302 | * i2o_driver_notify_device_remove_all - Send notify of removed device to | |
303 | * all I2O drivers | |
304 | * | |
305 | * Send notifications to all registered drivers that a device was removed. | |
306 | */ | |
307 | void i2o_driver_notify_device_remove_all(struct i2o_device *i2o_dev) | |
308 | { | |
309 | int i; | |
310 | struct i2o_driver *drv; | |
311 | ||
312 | for (i = 0; i < I2O_MAX_DRIVERS; i++) { | |
313 | drv = i2o_drivers[i]; | |
314 | ||
315 | if (drv) | |
316 | i2o_driver_notify_device_remove(drv, i2o_dev); | |
317 | } | |
318 | } | |
319 | ||
320 | /** | |
321 | * i2o_driver_init - initialize I2O drivers (OSMs) | |
322 | * | |
323 | * Registers the I2O bus and allocate memory for the array of OSMs. | |
324 | * | |
325 | * Returns 0 on success or negative error code on failure. | |
326 | */ | |
327 | int __init i2o_driver_init(void) | |
328 | { | |
329 | int rc = 0; | |
330 | ||
331 | spin_lock_init(&i2o_drivers_lock); | |
332 | ||
333 | if ((i2o_max_drivers < 2) || (i2o_max_drivers > 64) || | |
334 | ((i2o_max_drivers ^ (i2o_max_drivers - 1)) != | |
335 | (2 * i2o_max_drivers - 1))) { | |
336 | printk(KERN_WARNING "i2o: max_drivers set to %d, but must be " | |
337 | ">=2 and <= 64 and a power of 2\n", i2o_max_drivers); | |
338 | i2o_max_drivers = I2O_MAX_DRIVERS; | |
339 | } | |
340 | printk(KERN_INFO "i2o: max drivers = %d\n", i2o_max_drivers); | |
341 | ||
342 | i2o_drivers = | |
343 | kmalloc(i2o_max_drivers * sizeof(*i2o_drivers), GFP_KERNEL); | |
344 | if (!i2o_drivers) | |
345 | return -ENOMEM; | |
346 | ||
347 | memset(i2o_drivers, 0, i2o_max_drivers * sizeof(*i2o_drivers)); | |
348 | ||
349 | rc = bus_register(&i2o_bus_type); | |
350 | ||
351 | if (rc < 0) | |
352 | kfree(i2o_drivers); | |
353 | ||
354 | return rc; | |
355 | }; | |
356 | ||
357 | /** | |
358 | * i2o_driver_exit - clean up I2O drivers (OSMs) | |
359 | * | |
360 | * Unregisters the I2O bus and free driver array. | |
361 | */ | |
362 | void __exit i2o_driver_exit(void) | |
363 | { | |
364 | bus_unregister(&i2o_bus_type); | |
365 | kfree(i2o_drivers); | |
366 | }; | |
367 | ||
368 | EXPORT_SYMBOL(i2o_driver_register); | |
369 | EXPORT_SYMBOL(i2o_driver_unregister); | |
370 | EXPORT_SYMBOL(i2o_driver_notify_controller_add_all); | |
371 | EXPORT_SYMBOL(i2o_driver_notify_controller_remove_all); | |
372 | EXPORT_SYMBOL(i2o_driver_notify_device_add_all); | |
373 | EXPORT_SYMBOL(i2o_driver_notify_device_remove_all); |