2 * Functions to handle I2O devices
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/module.h>
17 #include <linux/i2o.h>
18 #include <linux/delay.h>
19 #include <linux/string.h>
20 #include <linux/slab.h>
24 * i2o_device_issue_claim - claim or release a device
25 * @dev: I2O device to claim or release
26 * @cmd: claim or release command
27 * @type: type of claim
29 * Issue I2O UTIL_CLAIM or UTIL_RELEASE messages. The message to be sent
30 * is set by cmd. dev is the I2O device which should be claim or
31 * released and the type is the claim type (see the I2O spec).
33 * Returs 0 on success or negative error code on failure.
35 static inline int i2o_device_issue_claim(struct i2o_device *dev, u32 cmd,
38 struct i2o_message *msg;
40 msg = i2o_msg_get_wait(dev->iop, I2O_TIMEOUT_MESSAGE_GET);
44 msg->u.head[0] = cpu_to_le32(FIVE_WORD_MSG_SIZE | SGL_OFFSET_0);
46 cpu_to_le32(cmd << 24 | HOST_TID << 12 | dev->lct_data.tid);
47 msg->body[0] = cpu_to_le32(type);
49 return i2o_msg_post_wait(dev->iop, msg, 60);
53 * i2o_device_claim - claim a device for use by an OSM
54 * @dev: I2O device to claim
55 * @drv: I2O driver which wants to claim the device
57 * Do the leg work to assign a device to a given OSM. If the claim succeeds,
58 * the owner is the primary. If the attempt fails a negative errno code
59 * is returned. On success zero is returned.
61 int i2o_device_claim(struct i2o_device *dev)
65 mutex_lock(&dev->lock);
67 rc = i2o_device_issue_claim(dev, I2O_CMD_UTIL_CLAIM, I2O_CLAIM_PRIMARY);
69 pr_debug("i2o: claim of device %d succeded\n",
72 pr_debug("i2o: claim of device %d failed %d\n",
73 dev->lct_data.tid, rc);
75 mutex_unlock(&dev->lock);
81 * i2o_device_claim_release - release a device that the OSM is using
82 * @dev: device to release
83 * @drv: driver which claimed the device
85 * Drop a claim by an OSM on a given I2O device.
87 * AC - some devices seem to want to refuse an unclaim until they have
88 * finished internal processing. It makes sense since you don't want a
89 * new device to go reconfiguring the entire system until you are done.
90 * Thus we are prepared to wait briefly.
92 * Returns 0 on success or negative error code on failure.
94 int i2o_device_claim_release(struct i2o_device *dev)
99 mutex_lock(&dev->lock);
102 * If the controller takes a nonblocking approach to
103 * releases we have to sleep/poll for a few times.
105 for (tries = 0; tries < 10; tries++) {
106 rc = i2o_device_issue_claim(dev, I2O_CMD_UTIL_RELEASE,
115 pr_debug("i2o: claim release of device %d succeded\n",
118 pr_debug("i2o: claim release of device %d failed %d\n",
119 dev->lct_data.tid, rc);
121 mutex_unlock(&dev->lock);
127 * i2o_device_release - release the memory for a I2O device
128 * @dev: I2O device which should be released
130 * Release the allocated memory. This function is called if refcount of
131 * device reaches 0 automatically.
133 static void i2o_device_release(struct device *dev)
135 struct i2o_device *i2o_dev = to_i2o_device(dev);
137 pr_debug("i2o: device %s released\n", dev->bus_id);
143 * i2o_device_show_class_id - Displays class id of I2O device
144 * @dev: device of which the class id should be displayed
145 * @attr: pointer to device attribute
146 * @buf: buffer into which the class id should be printed
148 * Returns the number of bytes which are printed into the buffer.
150 static ssize_t i2o_device_show_class_id(struct device *dev,
151 struct device_attribute *attr,
154 struct i2o_device *i2o_dev = to_i2o_device(dev);
156 sprintf(buf, "0x%03x\n", i2o_dev->lct_data.class_id);
157 return strlen(buf) + 1;
161 * i2o_device_show_tid - Displays TID of I2O device
162 * @dev: device of which the TID should be displayed
163 * @attr: pointer to device attribute
164 * @buf: buffer into which the TID should be printed
166 * Returns the number of bytes which are printed into the buffer.
168 static ssize_t i2o_device_show_tid(struct device *dev,
169 struct device_attribute *attr, char *buf)
171 struct i2o_device *i2o_dev = to_i2o_device(dev);
173 sprintf(buf, "0x%03x\n", i2o_dev->lct_data.tid);
174 return strlen(buf) + 1;
177 /* I2O device attributes */
178 struct device_attribute i2o_device_attrs[] = {
179 __ATTR(class_id, S_IRUGO, i2o_device_show_class_id, NULL),
180 __ATTR(tid, S_IRUGO, i2o_device_show_tid, NULL),
185 * i2o_device_alloc - Allocate a I2O device and initialize it
187 * Allocate the memory for a I2O device and initialize locks and lists
189 * Returns the allocated I2O device or a negative error code if the device
190 * could not be allocated.
192 static struct i2o_device *i2o_device_alloc(void)
194 struct i2o_device *dev;
196 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
198 return ERR_PTR(-ENOMEM);
200 INIT_LIST_HEAD(&dev->list);
201 mutex_init(&dev->lock);
203 dev->device.bus = &i2o_bus_type;
204 dev->device.release = &i2o_device_release;
210 * i2o_device_add - allocate a new I2O device and add it to the IOP
211 * @c: I2O controller that the device is on
212 * @entry: LCT entry of the I2O device
214 * Allocate a new I2O device and initialize it with the LCT entry. The
215 * device is appended to the device list of the controller.
217 * Returns zero on success, or a -ve errno.
219 static int i2o_device_add(struct i2o_controller *c, i2o_lct_entry *entry)
221 struct i2o_device *i2o_dev, *tmp;
224 i2o_dev = i2o_device_alloc();
225 if (IS_ERR(i2o_dev)) {
226 printk(KERN_ERR "i2o: unable to allocate i2o device\n");
227 return PTR_ERR(i2o_dev);
230 i2o_dev->lct_data = *entry;
232 snprintf(i2o_dev->device.bus_id, BUS_ID_SIZE, "%d:%03x", c->unit,
233 i2o_dev->lct_data.tid);
236 i2o_dev->device.parent = &c->device;
238 rc = device_register(&i2o_dev->device);
242 list_add_tail(&i2o_dev->list, &c->devices);
244 /* create user entries for this device */
245 tmp = i2o_iop_find_device(i2o_dev->iop, i2o_dev->lct_data.user_tid);
246 if (tmp && (tmp != i2o_dev)) {
247 rc = sysfs_create_link(&i2o_dev->device.kobj,
248 &tmp->device.kobj, "user");
253 /* create user entries refering to this device */
254 list_for_each_entry(tmp, &c->devices, list)
255 if ((tmp->lct_data.user_tid == i2o_dev->lct_data.tid)
256 && (tmp != i2o_dev)) {
257 rc = sysfs_create_link(&tmp->device.kobj,
258 &i2o_dev->device.kobj, "user");
263 /* create parent entries for this device */
264 tmp = i2o_iop_find_device(i2o_dev->iop, i2o_dev->lct_data.parent_tid);
265 if (tmp && (tmp != i2o_dev)) {
266 rc = sysfs_create_link(&i2o_dev->device.kobj,
267 &tmp->device.kobj, "parent");
272 /* create parent entries refering to this device */
273 list_for_each_entry(tmp, &c->devices, list)
274 if ((tmp->lct_data.parent_tid == i2o_dev->lct_data.tid)
275 && (tmp != i2o_dev)) {
276 rc = sysfs_create_link(&tmp->device.kobj,
277 &i2o_dev->device.kobj, "parent");
282 i2o_driver_notify_device_add_all(i2o_dev);
284 pr_debug("i2o: device %s added\n", i2o_dev->device.bus_id);
289 /* If link creating failed halfway, we loop whole list to cleanup.
290 * And we don't care wrong removing of link, because sysfs_remove_link
291 * will take care of it.
293 list_for_each_entry(tmp, &c->devices, list) {
294 if (tmp->lct_data.parent_tid == i2o_dev->lct_data.tid)
295 sysfs_remove_link(&tmp->device.kobj, "parent");
297 sysfs_remove_link(&i2o_dev->device.kobj, "parent");
299 list_for_each_entry(tmp, &c->devices, list)
300 if (tmp->lct_data.user_tid == i2o_dev->lct_data.tid)
301 sysfs_remove_link(&tmp->device.kobj, "user");
302 sysfs_remove_link(&i2o_dev->device.kobj, "user");
304 list_del(&i2o_dev->list);
305 device_unregister(&i2o_dev->device);
312 * i2o_device_remove - remove an I2O device from the I2O core
313 * @i2o_dev: I2O device which should be released
315 * Is used on I2O controller removal or LCT modification, when the device
316 * is removed from the system. Note that the device could still hang
317 * around until the refcount reaches 0.
319 void i2o_device_remove(struct i2o_device *i2o_dev)
321 struct i2o_device *tmp;
322 struct i2o_controller *c = i2o_dev->iop;
324 i2o_driver_notify_device_remove_all(i2o_dev);
326 sysfs_remove_link(&i2o_dev->device.kobj, "parent");
327 sysfs_remove_link(&i2o_dev->device.kobj, "user");
329 list_for_each_entry(tmp, &c->devices, list) {
330 if (tmp->lct_data.parent_tid == i2o_dev->lct_data.tid)
331 sysfs_remove_link(&tmp->device.kobj, "parent");
332 if (tmp->lct_data.user_tid == i2o_dev->lct_data.tid)
333 sysfs_remove_link(&tmp->device.kobj, "user");
335 list_del(&i2o_dev->list);
337 device_unregister(&i2o_dev->device);
341 * i2o_device_parse_lct - Parse a previously fetched LCT and create devices
342 * @c: I2O controller from which the LCT should be parsed.
344 * The Logical Configuration Table tells us what we can talk to on the
345 * board. For every entry we create an I2O device, which is registered in
348 * Returns 0 on success or negative error code on failure.
350 int i2o_device_parse_lct(struct i2o_controller *c)
352 struct i2o_device *dev, *tmp;
354 u32 *dlct = c->dlct.virt;
359 mutex_lock(&c->lct_lock);
363 buf = le32_to_cpu(*dlct++);
364 table_size = buf & 0xffff;
366 lct = c->lct = kmalloc(table_size * 4, GFP_KERNEL);
368 mutex_unlock(&c->lct_lock);
372 lct->lct_ver = buf >> 28;
373 lct->boot_tid = buf >> 16 & 0xfff;
374 lct->table_size = table_size;
375 lct->change_ind = le32_to_cpu(*dlct++);
376 lct->iop_flags = le32_to_cpu(*dlct++);
380 pr_debug("%s: LCT has %d entries (LCT size: %d)\n", c->name, max,
383 while (table_size > 0) {
384 i2o_lct_entry *entry = &lct->lct_entry[max];
387 buf = le32_to_cpu(*dlct++);
388 entry->entry_size = buf & 0xffff;
389 entry->tid = buf >> 16 & 0xfff;
391 entry->change_ind = le32_to_cpu(*dlct++);
392 entry->device_flags = le32_to_cpu(*dlct++);
394 buf = le32_to_cpu(*dlct++);
395 entry->class_id = buf & 0xfff;
396 entry->version = buf >> 12 & 0xf;
397 entry->vendor_id = buf >> 16;
399 entry->sub_class = le32_to_cpu(*dlct++);
401 buf = le32_to_cpu(*dlct++);
402 entry->user_tid = buf & 0xfff;
403 entry->parent_tid = buf >> 12 & 0xfff;
404 entry->bios_info = buf >> 24;
406 memcpy(&entry->identity_tag, dlct, 8);
409 entry->event_capabilities = le32_to_cpu(*dlct++);
411 /* add new devices, which are new in the LCT */
412 list_for_each_entry_safe(dev, tmp, &c->devices, list) {
413 if (entry->tid == dev->lct_data.tid) {
420 i2o_device_add(c, entry);
426 /* remove devices, which are not in the LCT anymore */
427 list_for_each_entry_safe(dev, tmp, &c->devices, list) {
430 for (i = 0; i < max; i++) {
431 if (lct->lct_entry[i].tid == dev->lct_data.tid) {
438 i2o_device_remove(dev);
441 mutex_unlock(&c->lct_lock);
447 * Run time support routines
450 /* Issue UTIL_PARAMS_GET or UTIL_PARAMS_SET
452 * This function can be used for all UtilParamsGet/Set operations.
453 * The OperationList is given in oplist-buffer,
454 * and results are returned in reslist-buffer.
455 * Note that the minimum sized reslist is 8 bytes and contains
456 * ResultCount, ErrorInfoSize, BlockStatus and BlockSize.
458 int i2o_parm_issue(struct i2o_device *i2o_dev, int cmd, void *oplist,
459 int oplen, void *reslist, int reslen)
461 struct i2o_message *msg;
465 struct i2o_controller *c = i2o_dev->iop;
466 struct device *dev = &c->pdev->dev;
470 if (i2o_dma_alloc(dev, &res, reslen))
473 msg = i2o_msg_get_wait(c, I2O_TIMEOUT_MESSAGE_GET);
475 i2o_dma_free(dev, &res);
481 cpu_to_le32(cmd << 24 | HOST_TID << 12 | i2o_dev->lct_data.tid);
482 msg->body[i++] = cpu_to_le32(0x00000000);
483 msg->body[i++] = cpu_to_le32(0x4C000000 | oplen); /* OperationList */
484 memcpy(&msg->body[i], oplist, oplen);
485 i += (oplen / 4 + (oplen % 4 ? 1 : 0));
486 msg->body[i++] = cpu_to_le32(0xD0000000 | res.len); /* ResultList */
487 msg->body[i++] = cpu_to_le32(res.phys);
490 cpu_to_le32(I2O_MESSAGE_SIZE(i + sizeof(struct i2o_message) / 4) |
493 rc = i2o_msg_post_wait_mem(c, msg, 10, &res);
495 /* This only looks like a memory leak - don't "fix" it. */
496 if (rc == -ETIMEDOUT)
499 memcpy(reslist, res.virt, res.len);
500 i2o_dma_free(dev, &res);
506 * Query one field group value or a whole scalar group.
508 int i2o_parm_field_get(struct i2o_device *i2o_dev, int group, int field,
509 void *buf, int buflen)
511 u32 opblk[] = { cpu_to_le32(0x00000001),
512 cpu_to_le32((u16) group << 16 | I2O_PARAMS_FIELD_GET),
513 cpu_to_le32((s16) field << 16 | 0x00000001)
515 u8 *resblk; /* 8 bytes for header */
518 resblk = kmalloc(buflen + 8, GFP_KERNEL);
522 rc = i2o_parm_issue(i2o_dev, I2O_CMD_UTIL_PARAMS_GET, opblk,
523 sizeof(opblk), resblk, buflen + 8);
525 memcpy(buf, resblk + 8, buflen); /* cut off header */
533 * if oper == I2O_PARAMS_TABLE_GET, get from all rows
534 * if fieldcount == -1 return all fields
535 * ibuf and ibuflen are unused (use NULL, 0)
536 * else return specific fields
537 * ibuf contains fieldindexes
539 * if oper == I2O_PARAMS_LIST_GET, get from specific rows
540 * if fieldcount == -1 return all fields
541 * ibuf contains rowcount, keyvalues
542 * else return specific fields
543 * fieldcount is # of fieldindexes
544 * ibuf contains fieldindexes, rowcount, keyvalues
546 * You could also use directly function i2o_issue_params().
548 int i2o_parm_table_get(struct i2o_device *dev, int oper, int group,
549 int fieldcount, void *ibuf, int ibuflen, void *resblk,
557 size += 4 - size % 4;
559 opblk = kmalloc(size, GFP_KERNEL);
561 printk(KERN_ERR "i2o: no memory for query buffer.\n");
565 opblk[0] = 1; /* operation count */
566 opblk[1] = 0; /* pad */
569 opblk[4] = fieldcount;
570 memcpy(opblk + 5, ibuf, ibuflen); /* other params */
572 size = i2o_parm_issue(dev, I2O_CMD_UTIL_PARAMS_GET, opblk,
573 size, resblk, reslen);
582 EXPORT_SYMBOL(i2o_device_claim);
583 EXPORT_SYMBOL(i2o_device_claim_release);
584 EXPORT_SYMBOL(i2o_parm_field_get);
585 EXPORT_SYMBOL(i2o_parm_table_get);
586 EXPORT_SYMBOL(i2o_parm_issue);