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);
126 * i2o_device_release - release the memory for a I2O device
127 * @dev: I2O device which should be released
129 * Release the allocated memory. This function is called if refcount of
130 * device reaches 0 automatically.
132 static void i2o_device_release(struct device *dev)
134 struct i2o_device *i2o_dev = to_i2o_device(dev);
136 pr_debug("i2o: device %s released\n", dev->bus_id);
142 * i2o_device_class_release - I2O class device release function
143 * @cd: I2O class device which is added to the I2O device class
145 * The function is just a stub - memory will be freed when
146 * associated I2O device is released.
148 static void i2o_device_class_release(struct class_device *cd)
154 * i2o_device_class_show_class_id - Displays class id of I2O device
155 * @cd: class device of which the class id should be displayed
156 * @buf: buffer into which the class id should be printed
158 * Returns the number of bytes which are printed into the buffer.
160 static ssize_t i2o_device_class_show_class_id(struct class_device *cd,
163 struct i2o_device *dev = to_i2o_device(cd->dev);
165 sprintf(buf, "0x%03x\n", dev->lct_data.class_id);
166 return strlen(buf) + 1;
170 * i2o_device_class_show_tid - Displays TID of I2O device
171 * @cd: class device of which the TID should be displayed
172 * @buf: buffer into which the class id should be printed
174 * Returns the number of bytes which are printed into the buffer.
176 static ssize_t i2o_device_class_show_tid(struct class_device *cd, char *buf)
178 struct i2o_device *dev = to_i2o_device(cd->dev);
180 sprintf(buf, "0x%03x\n", dev->lct_data.tid);
181 return strlen(buf) + 1;
184 static struct class_device_attribute i2o_device_class_attrs[] = {
185 __ATTR(class_id, S_IRUGO, i2o_device_class_show_class_id, NULL),
186 __ATTR(tid, S_IRUGO, i2o_device_class_show_tid, NULL),
190 /* I2O device class */
191 static struct class i2o_device_class = {
192 .name = "i2o_device",
193 .release = i2o_device_class_release,
194 .class_dev_attrs = i2o_device_class_attrs,
198 * i2o_device_alloc - Allocate a I2O device and initialize it
200 * Allocate the memory for a I2O device and initialize locks and lists
202 * Returns the allocated I2O device or a negative error code if the device
203 * could not be allocated.
205 static struct i2o_device *i2o_device_alloc(void)
207 struct i2o_device *dev;
209 dev = kmalloc(sizeof(*dev), GFP_KERNEL);
211 return ERR_PTR(-ENOMEM);
213 memset(dev, 0, sizeof(*dev));
215 INIT_LIST_HEAD(&dev->list);
216 init_MUTEX(&dev->lock);
218 dev->device.bus = &i2o_bus_type;
219 dev->device.release = &i2o_device_release;
220 dev->classdev.class = &i2o_device_class;
221 dev->classdev.dev = &dev->device;
227 * i2o_setup_sysfs_links - Adds attributes to the I2O device
228 * @cd: I2O class device which is added to the I2O device class
230 * This function get called when a I2O device is added to the class. It
231 * creates the attributes for each device and creates user/parent symlink
234 * Returns 0 on success or negative error code on failure.
236 static void i2o_setup_sysfs_links(struct i2o_device *i2o_dev)
238 struct i2o_controller *c = i2o_dev->iop;
239 struct i2o_device *tmp;
241 /* create user entries for this device */
242 tmp = i2o_iop_find_device(i2o_dev->iop, i2o_dev->lct_data.user_tid);
243 if (tmp && tmp != i2o_dev)
244 sysfs_create_link(&i2o_dev->device.kobj,
245 &tmp->device.kobj, "user");
247 /* create user entries refering to this device */
248 list_for_each_entry(tmp, &c->devices, list)
249 if (tmp->lct_data.user_tid == i2o_dev->lct_data.tid &&
251 sysfs_create_link(&tmp->device.kobj,
252 &i2o_dev->device.kobj, "user");
254 /* create parent entries for this device */
255 tmp = i2o_iop_find_device(i2o_dev->iop, i2o_dev->lct_data.parent_tid);
256 if (tmp && tmp != i2o_dev)
257 sysfs_create_link(&i2o_dev->device.kobj,
258 &tmp->device.kobj, "parent");
260 /* create parent entries refering to this device */
261 list_for_each_entry(tmp, &c->devices, list)
262 if (tmp->lct_data.parent_tid == i2o_dev->lct_data.tid &&
264 sysfs_create_link(&tmp->device.kobj,
265 &i2o_dev->device.kobj, "parent");
268 static void i2o_remove_sysfs_links(struct i2o_device *i2o_dev)
270 struct i2o_controller *c = i2o_dev->iop;
271 struct i2o_device *tmp;
273 sysfs_remove_link(&i2o_dev->device.kobj, "parent");
274 sysfs_remove_link(&i2o_dev->device.kobj, "user");
276 list_for_each_entry(tmp, &c->devices, list) {
277 if (tmp->lct_data.parent_tid == i2o_dev->lct_data.tid)
278 sysfs_remove_link(&tmp->device.kobj, "parent");
279 if (tmp->lct_data.user_tid == i2o_dev->lct_data.tid)
280 sysfs_remove_link(&tmp->device.kobj, "user");
287 * i2o_device_add - allocate a new I2O device and add it to the IOP
288 * @iop: I2O controller where the device is on
289 * @entry: LCT entry of the I2O device
291 * Allocate a new I2O device and initialize it with the LCT entry. The
292 * device is appended to the device list of the controller.
294 * Returns a pointer to the I2O device on success or negative error code
297 static struct i2o_device *i2o_device_add(struct i2o_controller *c,
298 i2o_lct_entry * entry)
300 struct i2o_device *dev;
302 dev = i2o_device_alloc();
304 printk(KERN_ERR "i2o: unable to allocate i2o device\n");
308 dev->lct_data = *entry;
311 snprintf(dev->device.bus_id, BUS_ID_SIZE, "%d:%03x", c->unit,
314 snprintf(dev->classdev.class_id, BUS_ID_SIZE, "%d:%03x", c->unit,
317 dev->device.parent = &c->device;
319 device_register(&dev->device);
321 list_add_tail(&dev->list, &c->devices);
323 class_device_register(&dev->classdev);
325 i2o_setup_sysfs_links(dev);
327 i2o_driver_notify_device_add_all(dev);
329 pr_debug("i2o: device %s added\n", dev->device.bus_id);
335 * i2o_device_remove - remove an I2O device from the I2O core
336 * @dev: I2O device which should be released
338 * Is used on I2O controller removal or LCT modification, when the device
339 * is removed from the system. Note that the device could still hang
340 * around until the refcount reaches 0.
342 void i2o_device_remove(struct i2o_device *i2o_dev)
344 i2o_driver_notify_device_remove_all(i2o_dev);
345 i2o_remove_sysfs_links(i2o_dev);
346 class_device_unregister(&i2o_dev->classdev);
347 list_del(&i2o_dev->list);
348 device_unregister(&i2o_dev->device);
352 * i2o_device_parse_lct - Parse a previously fetched LCT and create devices
353 * @c: I2O controller from which the LCT should be parsed.
355 * The Logical Configuration Table tells us what we can talk to on the
356 * board. For every entry we create an I2O device, which is registered in
359 * Returns 0 on success or negative error code on failure.
361 int i2o_device_parse_lct(struct i2o_controller *c)
363 struct i2o_device *dev, *tmp;
374 c->lct = kmalloc(lct->table_size * 4, GFP_KERNEL);
380 if (lct->table_size * 4 > c->dlct.len) {
381 memcpy(c->lct, c->dlct.virt, c->dlct.len);
386 memcpy(c->lct, c->dlct.virt, lct->table_size * 4);
390 max = (lct->table_size - 3) / 9;
392 pr_debug("%s: LCT has %d entries (LCT size: %d)\n", c->name, max,
395 /* remove devices, which are not in the LCT anymore */
396 list_for_each_entry_safe(dev, tmp, &c->devices, list) {
399 for (i = 0; i < max; i++) {
400 if (lct->lct_entry[i].tid == dev->lct_data.tid) {
407 i2o_device_remove(dev);
410 /* add new devices, which are new in the LCT */
411 for (i = 0; i < max; i++) {
414 list_for_each_entry_safe(dev, tmp, &c->devices, list) {
415 if (lct->lct_entry[i].tid == dev->lct_data.tid) {
422 i2o_device_add(c, &lct->lct_entry[i]);
431 * Run time support routines
434 /* Issue UTIL_PARAMS_GET or UTIL_PARAMS_SET
436 * This function can be used for all UtilParamsGet/Set operations.
437 * The OperationList is given in oplist-buffer,
438 * and results are returned in reslist-buffer.
439 * Note that the minimum sized reslist is 8 bytes and contains
440 * ResultCount, ErrorInfoSize, BlockStatus and BlockSize.
442 int i2o_parm_issue(struct i2o_device *i2o_dev, int cmd, void *oplist,
443 int oplen, void *reslist, int reslen)
445 struct i2o_message __iomem *msg;
447 u32 *res32 = (u32 *) reslist;
448 u32 *restmp = (u32 *) reslist;
453 struct i2o_controller *c = i2o_dev->iop;
454 struct device *dev = &c->pdev->dev;
458 if (i2o_dma_alloc(dev, &res, reslen, GFP_KERNEL))
461 m = i2o_msg_get_wait(c, &msg, I2O_TIMEOUT_MESSAGE_GET);
462 if (m == I2O_QUEUE_EMPTY) {
463 i2o_dma_free(dev, &res);
468 writel(cmd << 24 | HOST_TID << 12 | i2o_dev->lct_data.tid,
470 writel(0, &msg->body[i++]);
471 writel(0x4C000000 | oplen, &msg->body[i++]); /* OperationList */
472 memcpy_toio(&msg->body[i], oplist, oplen);
473 i += (oplen / 4 + (oplen % 4 ? 1 : 0));
474 writel(0xD0000000 | res.len, &msg->body[i++]); /* ResultList */
475 writel(res.phys, &msg->body[i++]);
477 writel(I2O_MESSAGE_SIZE(i + sizeof(struct i2o_message) / 4) |
478 SGL_OFFSET_5, &msg->u.head[0]);
480 rc = i2o_msg_post_wait_mem(c, m, 10, &res);
482 /* This only looks like a memory leak - don't "fix" it. */
483 if (rc == -ETIMEDOUT)
486 memcpy(reslist, res.virt, res.len);
487 i2o_dma_free(dev, &res);
493 * Calculate number of bytes of Result LIST
494 * We need to loop through each Result BLOCK and grab the length
498 for (i = 0; i < (res32[0] & 0X0000FFFF); i++) {
499 if (restmp[0] & 0x00FF0000) { /* BlockStatus != SUCCESS */
501 "%s - Error:\n ErrorInfoSize = 0x%02x, "
502 "BlockStatus = 0x%02x, BlockSize = 0x%04x\n",
504 I2O_CMD_UTIL_PARAMS_SET) ? "PARAMS_SET" :
505 "PARAMS_GET", res32[1] >> 24,
506 (res32[1] >> 16) & 0xFF, res32[1] & 0xFFFF);
509 * If this is the only request,than we return an error
511 if ((res32[0] & 0x0000FFFF) == 1) {
512 return -((res32[1] >> 16) & 0xFF); /* -BlockStatus */
515 len += restmp[0] & 0x0000FFFF; /* Length of res BLOCK */
516 restmp += restmp[0] & 0x0000FFFF; /* Skip to next BLOCK */
518 return (len << 2); /* bytes used by result list */
522 * Query one field group value or a whole scalar group.
524 int i2o_parm_field_get(struct i2o_device *i2o_dev, int group, int field,
525 void *buf, int buflen)
527 u16 opblk[] = { 1, 0, I2O_PARAMS_FIELD_GET, group, 1, field };
528 u8 *resblk; /* 8 bytes for header */
531 if (field == -1) /* whole group */
534 resblk = kmalloc(buflen + 8, GFP_KERNEL | GFP_ATOMIC);
538 size = i2o_parm_issue(i2o_dev, I2O_CMD_UTIL_PARAMS_GET, opblk,
539 sizeof(opblk), resblk, buflen + 8);
541 memcpy(buf, resblk + 8, buflen); /* cut off header */
552 * if oper == I2O_PARAMS_TABLE_GET, get from all rows
553 * if fieldcount == -1 return all fields
554 * ibuf and ibuflen are unused (use NULL, 0)
555 * else return specific fields
556 * ibuf contains fieldindexes
558 * if oper == I2O_PARAMS_LIST_GET, get from specific rows
559 * if fieldcount == -1 return all fields
560 * ibuf contains rowcount, keyvalues
561 * else return specific fields
562 * fieldcount is # of fieldindexes
563 * ibuf contains fieldindexes, rowcount, keyvalues
565 * You could also use directly function i2o_issue_params().
567 int i2o_parm_table_get(struct i2o_device *dev, int oper, int group,
568 int fieldcount, void *ibuf, int ibuflen, void *resblk,
576 size += 4 - size % 4;
578 opblk = kmalloc(size, GFP_KERNEL);
580 printk(KERN_ERR "i2o: no memory for query buffer.\n");
584 opblk[0] = 1; /* operation count */
585 opblk[1] = 0; /* pad */
588 opblk[4] = fieldcount;
589 memcpy(opblk + 5, ibuf, ibuflen); /* other params */
591 size = i2o_parm_issue(dev, I2O_CMD_UTIL_PARAMS_GET, opblk,
592 size, resblk, reslen);
602 * i2o_device_init - Initialize I2O devices
604 * Registers the I2O device class.
606 * Returns 0 on success or negative error code on failure.
608 int i2o_device_init(void)
610 return class_register(&i2o_device_class);
614 * i2o_device_exit - I2O devices exit function
616 * Unregisters the I2O device class.
618 void i2o_device_exit(void)
620 class_unregister(&i2o_device_class);
623 EXPORT_SYMBOL(i2o_device_claim);
624 EXPORT_SYMBOL(i2o_device_claim_release);
625 EXPORT_SYMBOL(i2o_parm_field_get);
626 EXPORT_SYMBOL(i2o_parm_table_get);
627 EXPORT_SYMBOL(i2o_parm_issue);