2 * Functions to handle I2O drivers (OSMs) and I2O bus type for sysfs
4 * Copyright (C) 2004 Markus Lidel <Markus.Lidel@shadowconnect.com>
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.
12 * Markus Lidel <Markus.Lidel@shadowconnect.com>
16 #include <linux/device.h>
17 #include <linux/module.h>
18 #include <linux/rwsem.h>
19 #include <linux/i2o.h>
21 /* max_drivers - Maximum I2O drivers (OSMs) which could be registered */
22 unsigned int i2o_max_drivers = I2O_MAX_DRIVERS;
23 module_param_named(max_drivers, i2o_max_drivers, uint, 0);
24 MODULE_PARM_DESC(max_drivers, "maximum number of OSM's to support");
26 /* I2O drivers lock and array */
27 static spinlock_t i2o_drivers_lock;
28 static struct i2o_driver **i2o_drivers;
31 * i2o_bus_match - Tell if a I2O device class id match the class ids of
32 * the I2O driver (OSM)
34 * @dev: device which should be verified
35 * @drv: the driver to match against
37 * Used by the bus to check if the driver wants to handle the device.
39 * Returns 1 if the class ids of the driver match the class id of the
40 * device, otherwise 0.
42 static int i2o_bus_match(struct device *dev, struct device_driver *drv)
44 struct i2o_device *i2o_dev = to_i2o_device(dev);
45 struct i2o_driver *i2o_drv = to_i2o_driver(drv);
46 struct i2o_class_id *ids = i2o_drv->classes;
49 while (ids->class_id != I2O_CLASS_END) {
50 if (ids->class_id == i2o_dev->lct_data.class_id)
58 struct bus_type i2o_bus_type = {
60 .match = i2o_bus_match,
64 * i2o_driver_register - Register a I2O driver (OSM) in the I2O core
65 * @drv: I2O driver which should be registered
67 * Registers the OSM drv in the I2O core and creates an event queues if
70 * Returns 0 on success or negative error code on failure.
72 int i2o_driver_register(struct i2o_driver *drv)
74 struct i2o_controller *c;
79 pr_debug("Register driver %s\n", drv->name);
82 drv->event_queue = create_workqueue(drv->name);
83 if (!drv->event_queue) {
84 printk(KERN_ERR "i2o: Could not initialize event queue "
85 "for driver %s\n", drv->name);
88 pr_debug("Event queue initialized for driver %s\n", drv->name);
90 drv->event_queue = NULL;
92 drv->driver.name = drv->name;
93 drv->driver.bus = &i2o_bus_type;
95 spin_lock_irqsave(&i2o_drivers_lock, flags);
97 for (i = 0; i2o_drivers[i]; i++)
98 if (i >= i2o_max_drivers) {
99 printk(KERN_ERR "i2o: too many drivers registered, "
100 "increase max_drivers\n");
101 spin_unlock_irqrestore(&i2o_drivers_lock, flags);
106 i2o_drivers[i] = drv;
108 spin_unlock_irqrestore(&i2o_drivers_lock, flags);
110 pr_debug("driver %s gets context id %d\n", drv->name, drv->context);
112 list_for_each_entry(c, &i2o_controllers, list) {
113 struct i2o_device *i2o_dev;
115 i2o_driver_notify_controller_add(drv, c);
116 list_for_each_entry(i2o_dev, &c->devices, list)
117 i2o_driver_notify_device_add(drv, i2o_dev);
121 rc = driver_register(&drv->driver);
123 destroy_workqueue(drv->event_queue);
129 * i2o_driver_unregister - Unregister a I2O driver (OSM) from the I2O core
130 * @drv: I2O driver which should be unregistered
132 * Unregisters the OSM drv from the I2O core and cleanup event queues if
135 void i2o_driver_unregister(struct i2o_driver *drv)
137 struct i2o_controller *c;
140 pr_debug("unregister driver %s\n", drv->name);
142 driver_unregister(&drv->driver);
144 list_for_each_entry(c, &i2o_controllers, list) {
145 struct i2o_device *i2o_dev;
147 list_for_each_entry(i2o_dev, &c->devices, list)
148 i2o_driver_notify_device_remove(drv, i2o_dev);
150 i2o_driver_notify_controller_remove(drv, c);
153 spin_lock_irqsave(&i2o_drivers_lock, flags);
154 i2o_drivers[drv->context] = NULL;
155 spin_unlock_irqrestore(&i2o_drivers_lock, flags);
157 if (drv->event_queue) {
158 destroy_workqueue(drv->event_queue);
159 drv->event_queue = NULL;
160 pr_debug("event queue removed for %s\n", drv->name);
165 * i2o_driver_dispatch - dispatch an I2O reply message
166 * @c: I2O controller of the message
167 * @m: I2O message number
168 * @msg: I2O message to be delivered
170 * The reply is delivered to the driver from which the original message
171 * was. This function is only called from interrupt context.
173 * Returns 0 on success and the message should not be flushed. Returns > 0
174 * on success and if the message should be flushed afterwords. Returns
175 * negative error code on failure (the message will be flushed too).
177 int i2o_driver_dispatch(struct i2o_controller *c, u32 m,
178 struct i2o_message __iomem *msg)
180 struct i2o_driver *drv;
181 u32 context = readl(&msg->u.s.icntxt);
183 if (likely(context < i2o_max_drivers)) {
184 spin_lock(&i2o_drivers_lock);
185 drv = i2o_drivers[context];
186 spin_unlock(&i2o_drivers_lock);
188 if (unlikely(!drv)) {
189 printk(KERN_WARNING "i2o: Spurious reply to unknown "
190 "driver %d\n", context);
194 if ((readl(&msg->u.head[1]) >> 24) == I2O_CMD_UTIL_EVT_REGISTER) {
195 struct i2o_device *dev, *tmp;
196 struct i2o_event *evt;
200 tid = readl(&msg->u.head[1]) & 0x1fff;
202 pr_debug("%s: event received from device %d\n", c->name,
205 /* cut of header from message size (in 32-bit words) */
206 size = (readl(&msg->u.head[0]) >> 16) - 5;
208 evt = kmalloc(size * 4 + sizeof(*evt), GFP_ATOMIC);
211 memset(evt, 0, size * 4 + sizeof(*evt));
214 memcpy_fromio(&evt->tcntxt, &msg->u.s.tcntxt,
217 list_for_each_entry_safe(dev, tmp, &c->devices, list)
218 if (dev->lct_data.tid == tid) {
223 INIT_WORK(&evt->work, (void (*)(void *))drv->event,
225 queue_work(drv->event_queue, &evt->work);
229 if (likely(drv->reply))
230 return drv->reply(c, m, msg);
232 pr_debug("%s: Reply to driver %s, but no reply function"
233 " defined!\n", c->name, drv->name);
236 printk(KERN_WARNING "i2o: Spurious reply to unknown driver "
237 "%d\n", readl(&msg->u.s.icntxt));
242 * i2o_driver_notify_controller_add_all - Send notify of added controller
245 * Send notifications to all registered drivers that a new controller was
248 void i2o_driver_notify_controller_add_all(struct i2o_controller *c)
251 struct i2o_driver *drv;
253 for (i = 0; i < I2O_MAX_DRIVERS; i++) {
254 drv = i2o_drivers[i];
257 i2o_driver_notify_controller_add(drv, c);
262 * i2o_driver_notify_controller_remove_all - Send notify of removed
263 * controller to all I2O drivers
265 * Send notifications to all registered drivers that a controller was
268 void i2o_driver_notify_controller_remove_all(struct i2o_controller *c)
271 struct i2o_driver *drv;
273 for (i = 0; i < I2O_MAX_DRIVERS; i++) {
274 drv = i2o_drivers[i];
277 i2o_driver_notify_controller_remove(drv, c);
282 * i2o_driver_notify_device_add_all - Send notify of added device to all
285 * Send notifications to all registered drivers that a device was added.
287 void i2o_driver_notify_device_add_all(struct i2o_device *i2o_dev)
290 struct i2o_driver *drv;
292 for (i = 0; i < I2O_MAX_DRIVERS; i++) {
293 drv = i2o_drivers[i];
296 i2o_driver_notify_device_add(drv, i2o_dev);
301 * i2o_driver_notify_device_remove_all - Send notify of removed device to
304 * Send notifications to all registered drivers that a device was removed.
306 void i2o_driver_notify_device_remove_all(struct i2o_device *i2o_dev)
309 struct i2o_driver *drv;
311 for (i = 0; i < I2O_MAX_DRIVERS; i++) {
312 drv = i2o_drivers[i];
315 i2o_driver_notify_device_remove(drv, i2o_dev);
320 * i2o_driver_init - initialize I2O drivers (OSMs)
322 * Registers the I2O bus and allocate memory for the array of OSMs.
324 * Returns 0 on success or negative error code on failure.
326 int __init i2o_driver_init(void)
330 spin_lock_init(&i2o_drivers_lock);
332 if ((i2o_max_drivers < 2) || (i2o_max_drivers > 64) ||
333 ((i2o_max_drivers ^ (i2o_max_drivers - 1)) !=
334 (2 * i2o_max_drivers - 1))) {
335 printk(KERN_WARNING "i2o: max_drivers set to %d, but must be "
336 ">=2 and <= 64 and a power of 2\n", i2o_max_drivers);
337 i2o_max_drivers = I2O_MAX_DRIVERS;
339 printk(KERN_INFO "i2o: max_drivers=%d\n", i2o_max_drivers);
342 kmalloc(i2o_max_drivers * sizeof(*i2o_drivers), GFP_KERNEL);
346 memset(i2o_drivers, 0, i2o_max_drivers * sizeof(*i2o_drivers));
348 rc = bus_register(&i2o_bus_type);
357 * i2o_driver_exit - clean up I2O drivers (OSMs)
359 * Unregisters the I2O bus and free driver array.
361 void __exit i2o_driver_exit(void)
363 bus_unregister(&i2o_bus_type);
367 EXPORT_SYMBOL(i2o_driver_register);
368 EXPORT_SYMBOL(i2o_driver_unregister);
369 EXPORT_SYMBOL(i2o_driver_notify_controller_add_all);
370 EXPORT_SYMBOL(i2o_driver_notify_controller_remove_all);
371 EXPORT_SYMBOL(i2o_driver_notify_device_add_all);
372 EXPORT_SYMBOL(i2o_driver_notify_device_remove_all);