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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 | ||
f88e119c | 21 | #define OSM_NAME "i2o" |
61fbfa81 | 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 | ||
f88e119c | 81 | osm_debug("Register driver %s\n", drv->name); |
1da177e4 LT |
82 | |
83 | if (drv->event) { | |
84 | drv->event_queue = create_workqueue(drv->name); | |
85 | if (!drv->event_queue) { | |
f88e119c ML |
86 | osm_err("Could not initialize event queue for driver " |
87 | "%s\n", drv->name); | |
1da177e4 LT |
88 | return -EFAULT; |
89 | } | |
f88e119c | 90 | osm_debug("Event queue initialized for driver %s\n", drv->name); |
1da177e4 LT |
91 | } else |
92 | drv->event_queue = NULL; | |
93 | ||
94 | drv->driver.name = drv->name; | |
95 | drv->driver.bus = &i2o_bus_type; | |
96 | ||
97 | spin_lock_irqsave(&i2o_drivers_lock, flags); | |
98 | ||
99 | for (i = 0; i2o_drivers[i]; i++) | |
100 | if (i >= i2o_max_drivers) { | |
f88e119c ML |
101 | osm_err("too many drivers registered, increase " |
102 | "max_drivers\n"); | |
1da177e4 LT |
103 | spin_unlock_irqrestore(&i2o_drivers_lock, flags); |
104 | return -EFAULT; | |
105 | } | |
106 | ||
107 | drv->context = i; | |
108 | i2o_drivers[i] = drv; | |
109 | ||
110 | spin_unlock_irqrestore(&i2o_drivers_lock, flags); | |
111 | ||
f88e119c | 112 | osm_debug("driver %s gets context id %d\n", drv->name, drv->context); |
1da177e4 LT |
113 | |
114 | list_for_each_entry(c, &i2o_controllers, list) { | |
115 | struct i2o_device *i2o_dev; | |
116 | ||
117 | i2o_driver_notify_controller_add(drv, c); | |
118 | list_for_each_entry(i2o_dev, &c->devices, list) | |
119 | i2o_driver_notify_device_add(drv, i2o_dev); | |
120 | } | |
121 | ||
122 | ||
123 | rc = driver_register(&drv->driver); | |
124 | if (rc) | |
125 | destroy_workqueue(drv->event_queue); | |
126 | ||
127 | return rc; | |
128 | }; | |
129 | ||
130 | /** | |
131 | * i2o_driver_unregister - Unregister a I2O driver (OSM) from the I2O core | |
132 | * @drv: I2O driver which should be unregistered | |
133 | * | |
134 | * Unregisters the OSM drv from the I2O core and cleanup event queues if | |
135 | * necessary. | |
136 | */ | |
137 | void i2o_driver_unregister(struct i2o_driver *drv) | |
138 | { | |
139 | struct i2o_controller *c; | |
140 | unsigned long flags; | |
141 | ||
f88e119c | 142 | osm_debug("unregister driver %s\n", drv->name); |
1da177e4 LT |
143 | |
144 | driver_unregister(&drv->driver); | |
145 | ||
146 | list_for_each_entry(c, &i2o_controllers, list) { | |
147 | struct i2o_device *i2o_dev; | |
148 | ||
149 | list_for_each_entry(i2o_dev, &c->devices, list) | |
150 | i2o_driver_notify_device_remove(drv, i2o_dev); | |
151 | ||
152 | i2o_driver_notify_controller_remove(drv, c); | |
153 | } | |
154 | ||
155 | spin_lock_irqsave(&i2o_drivers_lock, flags); | |
156 | i2o_drivers[drv->context] = NULL; | |
157 | spin_unlock_irqrestore(&i2o_drivers_lock, flags); | |
158 | ||
159 | if (drv->event_queue) { | |
160 | destroy_workqueue(drv->event_queue); | |
161 | drv->event_queue = NULL; | |
f88e119c | 162 | osm_debug("event queue removed for %s\n", drv->name); |
1da177e4 LT |
163 | } |
164 | }; | |
165 | ||
166 | /** | |
167 | * i2o_driver_dispatch - dispatch an I2O reply message | |
168 | * @c: I2O controller of the message | |
169 | * @m: I2O message number | |
170 | * @msg: I2O message to be delivered | |
171 | * | |
172 | * The reply is delivered to the driver from which the original message | |
173 | * was. This function is only called from interrupt context. | |
174 | * | |
175 | * Returns 0 on success and the message should not be flushed. Returns > 0 | |
176 | * on success and if the message should be flushed afterwords. Returns | |
177 | * negative error code on failure (the message will be flushed too). | |
178 | */ | |
f88e119c | 179 | int i2o_driver_dispatch(struct i2o_controller *c, u32 m) |
1da177e4 LT |
180 | { |
181 | struct i2o_driver *drv; | |
f88e119c | 182 | struct i2o_message __iomem *msg = i2o_msg_out_to_virt(c, m); |
1da177e4 LT |
183 | u32 context = readl(&msg->u.s.icntxt); |
184 | ||
61fbfa81 | 185 | if (unlikely(context >= i2o_max_drivers)) { |
f88e119c ML |
186 | osm_warn("%s: Spurious reply to unknown driver %d\n", c->name, |
187 | context); | |
61fbfa81 ML |
188 | return -EIO; |
189 | } | |
1da177e4 | 190 | |
61fbfa81 ML |
191 | spin_lock(&i2o_drivers_lock); |
192 | drv = i2o_drivers[context]; | |
193 | spin_unlock(&i2o_drivers_lock); | |
1da177e4 | 194 | |
61fbfa81 | 195 | if (unlikely(!drv)) { |
f88e119c ML |
196 | osm_warn("%s: Spurious reply to unknown driver %d\n", c->name, |
197 | context); | |
61fbfa81 ML |
198 | return -EIO; |
199 | } | |
1da177e4 | 200 | |
61fbfa81 ML |
201 | if ((readl(&msg->u.head[1]) >> 24) == I2O_CMD_UTIL_EVT_REGISTER) { |
202 | struct i2o_device *dev, *tmp; | |
203 | struct i2o_event *evt; | |
204 | u16 size; | |
205 | u16 tid = readl(&msg->u.head[1]) & 0xfff; | |
1da177e4 | 206 | |
61fbfa81 | 207 | osm_debug("event received from device %d\n", tid); |
1da177e4 | 208 | |
f88e119c ML |
209 | if (!drv->event) |
210 | return -EIO; | |
211 | ||
61fbfa81 ML |
212 | /* cut of header from message size (in 32-bit words) */ |
213 | size = (readl(&msg->u.head[0]) >> 16) - 5; | |
1da177e4 | 214 | |
61fbfa81 ML |
215 | evt = kmalloc(size * 4 + sizeof(*evt), GFP_ATOMIC | __GFP_ZERO); |
216 | if (!evt) | |
217 | return -ENOMEM; | |
1da177e4 | 218 | |
61fbfa81 ML |
219 | evt->size = size; |
220 | evt->tcntxt = readl(&msg->u.s.tcntxt); | |
221 | evt->event_indicator = readl(&msg->body[0]); | |
222 | memcpy_fromio(&evt->tcntxt, &msg->u.s.tcntxt, size * 4); | |
1da177e4 | 223 | |
61fbfa81 ML |
224 | list_for_each_entry_safe(dev, tmp, &c->devices, list) |
225 | if (dev->lct_data.tid == tid) { | |
226 | evt->i2o_dev = dev; | |
227 | break; | |
1da177e4 LT |
228 | } |
229 | ||
61fbfa81 ML |
230 | INIT_WORK(&evt->work, (void (*)(void *))drv->event, evt); |
231 | queue_work(drv->event_queue, &evt->work); | |
232 | return 1; | |
233 | } | |
234 | ||
235 | if (unlikely(!drv->reply)) { | |
f88e119c ML |
236 | osm_debug("%s: Reply to driver %s, but no reply function" |
237 | " defined!\n", c->name, drv->name); | |
1da177e4 | 238 | return -EIO; |
61fbfa81 ML |
239 | } |
240 | ||
241 | return drv->reply(c, m, msg); | |
1da177e4 LT |
242 | } |
243 | ||
244 | /** | |
245 | * i2o_driver_notify_controller_add_all - Send notify of added controller | |
246 | * to all I2O drivers | |
247 | * | |
248 | * Send notifications to all registered drivers that a new controller was | |
249 | * added. | |
250 | */ | |
251 | void i2o_driver_notify_controller_add_all(struct i2o_controller *c) | |
252 | { | |
253 | int i; | |
254 | struct i2o_driver *drv; | |
255 | ||
256 | for (i = 0; i < I2O_MAX_DRIVERS; i++) { | |
257 | drv = i2o_drivers[i]; | |
258 | ||
259 | if (drv) | |
260 | i2o_driver_notify_controller_add(drv, c); | |
261 | } | |
262 | } | |
263 | ||
264 | /** | |
265 | * i2o_driver_notify_controller_remove_all - Send notify of removed | |
266 | * controller to all I2O drivers | |
267 | * | |
268 | * Send notifications to all registered drivers that a controller was | |
269 | * removed. | |
270 | */ | |
271 | void i2o_driver_notify_controller_remove_all(struct i2o_controller *c) | |
272 | { | |
273 | int i; | |
274 | struct i2o_driver *drv; | |
275 | ||
276 | for (i = 0; i < I2O_MAX_DRIVERS; i++) { | |
277 | drv = i2o_drivers[i]; | |
278 | ||
279 | if (drv) | |
280 | i2o_driver_notify_controller_remove(drv, c); | |
281 | } | |
282 | } | |
283 | ||
284 | /** | |
285 | * i2o_driver_notify_device_add_all - Send notify of added device to all | |
286 | * I2O drivers | |
287 | * | |
288 | * Send notifications to all registered drivers that a device was added. | |
289 | */ | |
290 | void i2o_driver_notify_device_add_all(struct i2o_device *i2o_dev) | |
291 | { | |
292 | int i; | |
293 | struct i2o_driver *drv; | |
294 | ||
295 | for (i = 0; i < I2O_MAX_DRIVERS; i++) { | |
296 | drv = i2o_drivers[i]; | |
297 | ||
298 | if (drv) | |
299 | i2o_driver_notify_device_add(drv, i2o_dev); | |
300 | } | |
301 | } | |
302 | ||
303 | /** | |
304 | * i2o_driver_notify_device_remove_all - Send notify of removed device to | |
305 | * all I2O drivers | |
306 | * | |
307 | * Send notifications to all registered drivers that a device was removed. | |
308 | */ | |
309 | void i2o_driver_notify_device_remove_all(struct i2o_device *i2o_dev) | |
310 | { | |
311 | int i; | |
312 | struct i2o_driver *drv; | |
313 | ||
314 | for (i = 0; i < I2O_MAX_DRIVERS; i++) { | |
315 | drv = i2o_drivers[i]; | |
316 | ||
317 | if (drv) | |
318 | i2o_driver_notify_device_remove(drv, i2o_dev); | |
319 | } | |
320 | } | |
321 | ||
322 | /** | |
323 | * i2o_driver_init - initialize I2O drivers (OSMs) | |
324 | * | |
325 | * Registers the I2O bus and allocate memory for the array of OSMs. | |
326 | * | |
327 | * Returns 0 on success or negative error code on failure. | |
328 | */ | |
329 | int __init i2o_driver_init(void) | |
330 | { | |
331 | int rc = 0; | |
332 | ||
333 | spin_lock_init(&i2o_drivers_lock); | |
334 | ||
335 | if ((i2o_max_drivers < 2) || (i2o_max_drivers > 64) || | |
336 | ((i2o_max_drivers ^ (i2o_max_drivers - 1)) != | |
337 | (2 * i2o_max_drivers - 1))) { | |
f88e119c ML |
338 | osm_warn("max_drivers set to %d, but must be >=2 and <= 64 and " |
339 | "a power of 2\n", i2o_max_drivers); | |
1da177e4 LT |
340 | i2o_max_drivers = I2O_MAX_DRIVERS; |
341 | } | |
f88e119c | 342 | osm_info("max drivers = %d\n", i2o_max_drivers); |
1da177e4 LT |
343 | |
344 | i2o_drivers = | |
345 | kmalloc(i2o_max_drivers * sizeof(*i2o_drivers), GFP_KERNEL); | |
346 | if (!i2o_drivers) | |
347 | return -ENOMEM; | |
348 | ||
349 | memset(i2o_drivers, 0, i2o_max_drivers * sizeof(*i2o_drivers)); | |
350 | ||
351 | rc = bus_register(&i2o_bus_type); | |
352 | ||
353 | if (rc < 0) | |
354 | kfree(i2o_drivers); | |
355 | ||
356 | return rc; | |
357 | }; | |
358 | ||
359 | /** | |
360 | * i2o_driver_exit - clean up I2O drivers (OSMs) | |
361 | * | |
362 | * Unregisters the I2O bus and free driver array. | |
363 | */ | |
364 | void __exit i2o_driver_exit(void) | |
365 | { | |
366 | bus_unregister(&i2o_bus_type); | |
367 | kfree(i2o_drivers); | |
368 | }; | |
369 | ||
370 | EXPORT_SYMBOL(i2o_driver_register); | |
371 | EXPORT_SYMBOL(i2o_driver_unregister); | |
372 | EXPORT_SYMBOL(i2o_driver_notify_controller_add_all); | |
373 | EXPORT_SYMBOL(i2o_driver_notify_controller_remove_all); | |
374 | EXPORT_SYMBOL(i2o_driver_notify_device_add_all); | |
375 | EXPORT_SYMBOL(i2o_driver_notify_device_remove_all); |