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>
22 * i2o_device_issue_claim - claim or release a device
23 * @dev: I2O device to claim or release
24 * @cmd: claim or release command
25 * @type: type of claim
27 * Issue I2O UTIL_CLAIM or UTIL_RELEASE messages. The message to be sent
28 * is set by cmd. dev is the I2O device which should be claim or
29 * released and the type is the claim type (see the I2O spec).
31 * Returs 0 on success or negative error code on failure.
33 static inline int i2o_device_issue_claim(struct i2o_device *dev, u32 cmd,
36 struct i2o_message __iomem *msg;
39 m = i2o_msg_get_wait(dev->iop, &msg, I2O_TIMEOUT_MESSAGE_GET);
40 if (m == I2O_QUEUE_EMPTY)
43 writel(FIVE_WORD_MSG_SIZE | SGL_OFFSET_0, &msg->u.head[0]);
44 writel(cmd << 24 | HOST_TID << 12 | dev->lct_data.tid, &msg->u.head[1]);
45 writel(type, &msg->body[0]);
47 return i2o_msg_post_wait(dev->iop, m, 60);
51 * i2o_device_claim - claim a device for use by an OSM
52 * @dev: I2O device to claim
53 * @drv: I2O driver which wants to claim the device
55 * Do the leg work to assign a device to a given OSM. If the claim succeed
56 * the owner of the rimary. If the attempt fails a negative errno code
57 * is returned. On success zero is returned.
59 int i2o_device_claim(struct i2o_device *dev)
65 rc = i2o_device_issue_claim(dev, I2O_CMD_UTIL_CLAIM, I2O_CLAIM_PRIMARY);
67 pr_debug("i2o: claim of device %d succeded\n",
70 pr_debug("i2o: claim of device %d failed %d\n",
71 dev->lct_data.tid, rc);
79 * i2o_device_claim_release - release a device that the OSM is using
80 * @dev: device to release
81 * @drv: driver which claimed the device
83 * Drop a claim by an OSM on a given I2O device.
85 * AC - some devices seem to want to refuse an unclaim until they have
86 * finished internal processing. It makes sense since you don't want a
87 * new device to go reconfiguring the entire system until you are done.
88 * Thus we are prepared to wait briefly.
90 * Returns 0 on success or negative error code on failure.
92 int i2o_device_claim_release(struct i2o_device *dev)
100 * If the controller takes a nonblocking approach to
101 * releases we have to sleep/poll for a few times.
103 for (tries = 0; tries < 10; tries++) {
104 rc = i2o_device_issue_claim(dev, I2O_CMD_UTIL_RELEASE,
113 pr_debug("i2o: claim release of device %d succeded\n",
116 pr_debug("i2o: claim release of device %d failed %d\n",
117 dev->lct_data.tid, rc);
125 * i2o_device_release - release the memory for a I2O device
126 * @dev: I2O device which should be released
128 * Release the allocated memory. This function is called if refcount of
129 * device reaches 0 automatically.
131 static void i2o_device_release(struct device *dev)
133 struct i2o_device *i2o_dev = to_i2o_device(dev);
135 pr_debug("i2o: device %s released\n", dev->bus_id);
141 * i2o_device_class_release - Remove I2O device attributes
142 * @cd: I2O class device which is added to the I2O device class
144 * Removes attributes from the I2O device again. Also search each device
145 * on the controller for I2O devices which refert to this device as parent
146 * or user and remove this links also.
148 static void i2o_device_class_release(struct class_device *cd)
150 struct i2o_device *i2o_dev, *tmp;
151 struct i2o_controller *c;
153 i2o_dev = to_i2o_device(cd->dev);
156 sysfs_remove_link(&i2o_dev->device.kobj, "parent");
157 sysfs_remove_link(&i2o_dev->device.kobj, "user");
159 list_for_each_entry(tmp, &c->devices, list) {
160 if (tmp->lct_data.parent_tid == i2o_dev->lct_data.tid)
161 sysfs_remove_link(&tmp->device.kobj, "parent");
162 if (tmp->lct_data.user_tid == i2o_dev->lct_data.tid)
163 sysfs_remove_link(&tmp->device.kobj, "user");
167 /* I2O device class */
168 static struct class i2o_device_class = {
169 .name = "i2o_device",
170 .release = i2o_device_class_release
174 * i2o_device_alloc - Allocate a I2O device and initialize it
176 * Allocate the memory for a I2O device and initialize locks and lists
178 * Returns the allocated I2O device or a negative error code if the device
179 * could not be allocated.
181 static struct i2o_device *i2o_device_alloc(void)
183 struct i2o_device *dev;
185 dev = kmalloc(sizeof(*dev), GFP_KERNEL);
187 return ERR_PTR(-ENOMEM);
189 memset(dev, 0, sizeof(*dev));
191 INIT_LIST_HEAD(&dev->list);
192 init_MUTEX(&dev->lock);
194 dev->device.bus = &i2o_bus_type;
195 dev->device.release = &i2o_device_release;
196 dev->classdev.class = &i2o_device_class;
197 dev->classdev.dev = &dev->device;
203 * i2o_device_add - allocate a new I2O device and add it to the IOP
204 * @iop: I2O controller where the device is on
205 * @entry: LCT entry of the I2O device
207 * Allocate a new I2O device and initialize it with the LCT entry. The
208 * device is appended to the device list of the controller.
210 * Returns a pointer to the I2O device on success or negative error code
213 static struct i2o_device *i2o_device_add(struct i2o_controller *c,
214 i2o_lct_entry * entry)
216 struct i2o_device *dev;
218 dev = i2o_device_alloc();
220 printk(KERN_ERR "i2o: unable to allocate i2o device\n");
224 dev->lct_data = *entry;
226 snprintf(dev->device.bus_id, BUS_ID_SIZE, "%d:%03x", c->unit,
229 snprintf(dev->classdev.class_id, BUS_ID_SIZE, "%d:%03x", c->unit,
233 dev->device.parent = &c->device;
235 device_register(&dev->device);
237 list_add_tail(&dev->list, &c->devices);
239 class_device_register(&dev->classdev);
241 i2o_driver_notify_device_add_all(dev);
243 pr_debug("i2o: device %s added\n", dev->device.bus_id);
249 * i2o_device_remove - remove an I2O device from the I2O core
250 * @dev: I2O device which should be released
252 * Is used on I2O controller removal or LCT modification, when the device
253 * is removed from the system. Note that the device could still hang
254 * around until the refcount reaches 0.
256 void i2o_device_remove(struct i2o_device *i2o_dev)
258 i2o_driver_notify_device_remove_all(i2o_dev);
259 class_device_unregister(&i2o_dev->classdev);
260 list_del(&i2o_dev->list);
261 device_unregister(&i2o_dev->device);
265 * i2o_device_parse_lct - Parse a previously fetched LCT and create devices
266 * @c: I2O controller from which the LCT should be parsed.
268 * The Logical Configuration Table tells us what we can talk to on the
269 * board. For every entry we create an I2O device, which is registered in
272 * Returns 0 on success or negative error code on failure.
274 int i2o_device_parse_lct(struct i2o_controller *c)
276 struct i2o_device *dev, *tmp;
287 c->lct = kmalloc(lct->table_size * 4, GFP_KERNEL);
293 if (lct->table_size * 4 > c->dlct.len) {
294 memcpy(c->lct, c->dlct.virt, c->dlct.len);
299 memcpy(c->lct, c->dlct.virt, lct->table_size * 4);
303 max = (lct->table_size - 3) / 9;
305 pr_debug("%s: LCT has %d entries (LCT size: %d)\n", c->name, max,
308 /* remove devices, which are not in the LCT anymore */
309 list_for_each_entry_safe(dev, tmp, &c->devices, list) {
312 for (i = 0; i < max; i++) {
313 if (lct->lct_entry[i].tid == dev->lct_data.tid) {
320 i2o_device_remove(dev);
323 /* add new devices, which are new in the LCT */
324 for (i = 0; i < max; i++) {
327 list_for_each_entry_safe(dev, tmp, &c->devices, list) {
328 if (lct->lct_entry[i].tid == dev->lct_data.tid) {
335 i2o_device_add(c, &lct->lct_entry[i]);
343 * i2o_device_class_show_class_id - Displays class id of I2O device
344 * @cd: class device of which the class id should be displayed
345 * @buf: buffer into which the class id should be printed
347 * Returns the number of bytes which are printed into the buffer.
349 static ssize_t i2o_device_class_show_class_id(struct class_device *cd,
352 struct i2o_device *dev = to_i2o_device(cd->dev);
354 sprintf(buf, "0x%03x\n", dev->lct_data.class_id);
355 return strlen(buf) + 1;
359 * i2o_device_class_show_tid - Displays TID of I2O device
360 * @cd: class device of which the TID should be displayed
361 * @buf: buffer into which the class id should be printed
363 * Returns the number of bytes which are printed into the buffer.
365 static ssize_t i2o_device_class_show_tid(struct class_device *cd, char *buf)
367 struct i2o_device *dev = to_i2o_device(cd->dev);
369 sprintf(buf, "0x%03x\n", dev->lct_data.tid);
370 return strlen(buf) + 1;
373 /* I2O device class attributes */
374 static CLASS_DEVICE_ATTR(class_id, S_IRUGO, i2o_device_class_show_class_id,
376 static CLASS_DEVICE_ATTR(tid, S_IRUGO, i2o_device_class_show_tid, NULL);
379 * i2o_device_class_add - Adds attributes to the I2O device
380 * @cd: I2O class device which is added to the I2O device class
382 * This function get called when a I2O device is added to the class. It
383 * creates the attributes for each device and creates user/parent symlink
386 * Returns 0 on success or negative error code on failure.
388 static int i2o_device_class_add(struct class_device *cd)
390 struct i2o_device *i2o_dev, *tmp;
391 struct i2o_controller *c;
393 i2o_dev = to_i2o_device(cd->dev);
396 class_device_create_file(cd, &class_device_attr_class_id);
397 class_device_create_file(cd, &class_device_attr_tid);
399 /* create user entries for this device */
400 tmp = i2o_iop_find_device(i2o_dev->iop, i2o_dev->lct_data.user_tid);
401 if (tmp && (tmp != i2o_dev))
402 sysfs_create_link(&i2o_dev->device.kobj, &tmp->device.kobj,
405 /* create user entries refering to this device */
406 list_for_each_entry(tmp, &c->devices, list)
407 if ((tmp->lct_data.user_tid == i2o_dev->lct_data.tid)
409 sysfs_create_link(&tmp->device.kobj,
410 &i2o_dev->device.kobj, "user");
412 /* create parent entries for this device */
413 tmp = i2o_iop_find_device(i2o_dev->iop, i2o_dev->lct_data.parent_tid);
414 if (tmp && (tmp != i2o_dev))
415 sysfs_create_link(&i2o_dev->device.kobj, &tmp->device.kobj,
418 /* create parent entries refering to this device */
419 list_for_each_entry(tmp, &c->devices, list)
420 if ((tmp->lct_data.parent_tid == i2o_dev->lct_data.tid)
422 sysfs_create_link(&tmp->device.kobj,
423 &i2o_dev->device.kobj, "parent");
428 /* I2O device class interface */
429 static struct class_interface i2o_device_class_interface = {
430 .class = &i2o_device_class,
431 .add = i2o_device_class_add
435 * Run time support routines
438 /* Issue UTIL_PARAMS_GET or UTIL_PARAMS_SET
440 * This function can be used for all UtilParamsGet/Set operations.
441 * The OperationList is given in oplist-buffer,
442 * and results are returned in reslist-buffer.
443 * Note that the minimum sized reslist is 8 bytes and contains
444 * ResultCount, ErrorInfoSize, BlockStatus and BlockSize.
446 int i2o_parm_issue(struct i2o_device *i2o_dev, int cmd, void *oplist,
447 int oplen, void *reslist, int reslen)
449 struct i2o_message __iomem *msg;
451 u32 *res32 = (u32 *) reslist;
452 u32 *restmp = (u32 *) reslist;
457 struct i2o_controller *c = i2o_dev->iop;
458 struct device *dev = &c->pdev->dev;
462 if (i2o_dma_alloc(dev, &res, reslen, GFP_KERNEL))
465 m = i2o_msg_get_wait(c, &msg, I2O_TIMEOUT_MESSAGE_GET);
466 if (m == I2O_QUEUE_EMPTY) {
467 i2o_dma_free(dev, &res);
472 writel(cmd << 24 | HOST_TID << 12 | i2o_dev->lct_data.tid,
474 writel(0, &msg->body[i++]);
475 writel(0x4C000000 | oplen, &msg->body[i++]); /* OperationList */
476 memcpy_toio(&msg->body[i], oplist, oplen);
477 i += (oplen / 4 + (oplen % 4 ? 1 : 0));
478 writel(0xD0000000 | res.len, &msg->body[i++]); /* ResultList */
479 writel(res.phys, &msg->body[i++]);
481 writel(I2O_MESSAGE_SIZE(i + sizeof(struct i2o_message) / 4) |
482 SGL_OFFSET_5, &msg->u.head[0]);
484 rc = i2o_msg_post_wait_mem(c, m, 10, &res);
486 /* This only looks like a memory leak - don't "fix" it. */
487 if (rc == -ETIMEDOUT)
490 memcpy(reslist, res.virt, res.len);
491 i2o_dma_free(dev, &res);
497 * Calculate number of bytes of Result LIST
498 * We need to loop through each Result BLOCK and grab the length
502 for (i = 0; i < (res32[0] & 0X0000FFFF); i++) {
503 if (restmp[0] & 0x00FF0000) { /* BlockStatus != SUCCESS */
505 "%s - Error:\n ErrorInfoSize = 0x%02x, "
506 "BlockStatus = 0x%02x, BlockSize = 0x%04x\n",
508 I2O_CMD_UTIL_PARAMS_SET) ? "PARAMS_SET" :
509 "PARAMS_GET", res32[1] >> 24,
510 (res32[1] >> 16) & 0xFF, res32[1] & 0xFFFF);
513 * If this is the only request,than we return an error
515 if ((res32[0] & 0x0000FFFF) == 1) {
516 return -((res32[1] >> 16) & 0xFF); /* -BlockStatus */
519 len += restmp[0] & 0x0000FFFF; /* Length of res BLOCK */
520 restmp += restmp[0] & 0x0000FFFF; /* Skip to next BLOCK */
522 return (len << 2); /* bytes used by result list */
526 * Query one field group value or a whole scalar group.
528 int i2o_parm_field_get(struct i2o_device *i2o_dev, int group, int field,
529 void *buf, int buflen)
531 u16 opblk[] = { 1, 0, I2O_PARAMS_FIELD_GET, group, 1, field };
532 u8 *resblk; /* 8 bytes for header */
535 if (field == -1) /* whole group */
538 resblk = kmalloc(buflen + 8, GFP_KERNEL | GFP_ATOMIC);
542 size = i2o_parm_issue(i2o_dev, I2O_CMD_UTIL_PARAMS_GET, opblk,
543 sizeof(opblk), resblk, buflen + 8);
545 memcpy(buf, resblk + 8, buflen); /* cut off header */
556 * if oper == I2O_PARAMS_TABLE_GET, get from all rows
557 * if fieldcount == -1 return all fields
558 * ibuf and ibuflen are unused (use NULL, 0)
559 * else return specific fields
560 * ibuf contains fieldindexes
562 * if oper == I2O_PARAMS_LIST_GET, get from specific rows
563 * if fieldcount == -1 return all fields
564 * ibuf contains rowcount, keyvalues
565 * else return specific fields
566 * fieldcount is # of fieldindexes
567 * ibuf contains fieldindexes, rowcount, keyvalues
569 * You could also use directly function i2o_issue_params().
571 int i2o_parm_table_get(struct i2o_device *dev, int oper, int group,
572 int fieldcount, void *ibuf, int ibuflen, void *resblk,
580 size += 4 - size % 4;
582 opblk = kmalloc(size, GFP_KERNEL);
584 printk(KERN_ERR "i2o: no memory for query buffer.\n");
588 opblk[0] = 1; /* operation count */
589 opblk[1] = 0; /* pad */
592 opblk[4] = fieldcount;
593 memcpy(opblk + 5, ibuf, ibuflen); /* other params */
595 size = i2o_parm_issue(dev, I2O_CMD_UTIL_PARAMS_GET, opblk,
596 size, resblk, reslen);
606 * i2o_device_init - Initialize I2O devices
608 * Registers the I2O device class.
610 * Returns 0 on success or negative error code on failure.
612 int i2o_device_init(void)
616 rc = class_register(&i2o_device_class);
620 return class_interface_register(&i2o_device_class_interface);
624 * i2o_device_exit - I2O devices exit function
626 * Unregisters the I2O device class.
628 void i2o_device_exit(void)
630 class_interface_register(&i2o_device_class_interface);
631 class_unregister(&i2o_device_class);
634 EXPORT_SYMBOL(i2o_device_claim);
635 EXPORT_SYMBOL(i2o_device_claim_release);
636 EXPORT_SYMBOL(i2o_parm_field_get);
637 EXPORT_SYMBOL(i2o_parm_table_get);
638 EXPORT_SYMBOL(i2o_parm_issue);