[PATCH] usbcore: Improve endpoint sysfs file handling
[linux/fpc-iii.git] / drivers / message / i2o / i2o_scsi.c
blob9f1744c3933b8b258b61128d83577e6a188c11bd
1 /*
2 * This program is free software; you can redistribute it and/or modify it
3 * under the terms of the GNU General Public License as published by the
4 * Free Software Foundation; either version 2, or (at your option) any
5 * later version.
7 * This program is distributed in the hope that it will be useful, but
8 * WITHOUT ANY WARRANTY; without even the implied warranty of
9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
10 * General Public License for more details.
12 * For the avoidance of doubt the "preferred form" of this code is one which
13 * is in an open non patent encumbered format. Where cryptographic key signing
14 * forms part of the process of creating an executable the information
15 * including keys needed to generate an equivalently functional executable
16 * are deemed to be part of the source code.
18 * Complications for I2O scsi
20 * o Each (bus,lun) is a logical device in I2O. We keep a map
21 * table. We spoof failed selection for unmapped units
22 * o Request sense buffers can come back for free.
23 * o Scatter gather is a bit dynamic. We have to investigate at
24 * setup time.
25 * o Some of our resources are dynamically shared. The i2o core
26 * needs a message reservation protocol to avoid swap v net
27 * deadlocking. We need to back off queue requests.
29 * In general the firmware wants to help. Where its help isn't performance
30 * useful we just ignore the aid. Its not worth the code in truth.
32 * Fixes/additions:
33 * Steve Ralston:
34 * Scatter gather now works
35 * Markus Lidel <Markus.Lidel@shadowconnect.com>:
36 * Minor fixes for 2.6.
38 * To Do:
39 * 64bit cleanups
40 * Fix the resource management problems.
43 #include <linux/module.h>
44 #include <linux/kernel.h>
45 #include <linux/types.h>
46 #include <linux/string.h>
47 #include <linux/ioport.h>
48 #include <linux/jiffies.h>
49 #include <linux/interrupt.h>
50 #include <linux/timer.h>
51 #include <linux/delay.h>
52 #include <linux/proc_fs.h>
53 #include <linux/prefetch.h>
54 #include <linux/pci.h>
55 #include <linux/blkdev.h>
56 #include <linux/i2o.h>
57 #include <linux/scatterlist.h>
59 #include <asm/dma.h>
60 #include <asm/system.h>
61 #include <asm/io.h>
62 #include <asm/atomic.h>
64 #include <scsi/scsi.h>
65 #include <scsi/scsi_host.h>
66 #include <scsi/scsi_device.h>
67 #include <scsi/scsi_cmnd.h>
68 #include <scsi/scsi_request.h>
69 #include <scsi/sg.h>
70 #include <scsi/sg_request.h>
72 #define OSM_NAME "scsi-osm"
73 #define OSM_VERSION "1.282"
74 #define OSM_DESCRIPTION "I2O SCSI Peripheral OSM"
76 static struct i2o_driver i2o_scsi_driver;
78 static unsigned int i2o_scsi_max_id = 16;
79 static unsigned int i2o_scsi_max_lun = 255;
81 struct i2o_scsi_host {
82 struct Scsi_Host *scsi_host; /* pointer to the SCSI host */
83 struct i2o_controller *iop; /* pointer to the I2O controller */
84 unsigned int lun; /* lun's used for block devices */
85 struct i2o_device *channel[0]; /* channel->i2o_dev mapping table */
88 static struct scsi_host_template i2o_scsi_host_template;
90 #define I2O_SCSI_CAN_QUEUE 4
92 /* SCSI OSM class handling definition */
93 static struct i2o_class_id i2o_scsi_class_id[] = {
94 {I2O_CLASS_SCSI_PERIPHERAL},
95 {I2O_CLASS_END}
98 static struct i2o_scsi_host *i2o_scsi_host_alloc(struct i2o_controller *c)
100 struct i2o_scsi_host *i2o_shost;
101 struct i2o_device *i2o_dev;
102 struct Scsi_Host *scsi_host;
103 int max_channel = 0;
104 u8 type;
105 int i;
106 size_t size;
107 u16 body_size = 6;
109 #ifdef CONFIG_I2O_EXT_ADAPTEC
110 if (c->adaptec)
111 body_size = 8;
112 #endif
114 list_for_each_entry(i2o_dev, &c->devices, list)
115 if (i2o_dev->lct_data.class_id == I2O_CLASS_BUS_ADAPTER) {
116 if (i2o_parm_field_get(i2o_dev, 0x0000, 0, &type, 1)
117 && (type == 0x01)) /* SCSI bus */
118 max_channel++;
121 if (!max_channel) {
122 osm_warn("no channels found on %s\n", c->name);
123 return ERR_PTR(-EFAULT);
126 size = max_channel * sizeof(struct i2o_device *)
127 + sizeof(struct i2o_scsi_host);
129 scsi_host = scsi_host_alloc(&i2o_scsi_host_template, size);
130 if (!scsi_host) {
131 osm_warn("Could not allocate SCSI host\n");
132 return ERR_PTR(-ENOMEM);
135 scsi_host->max_channel = max_channel - 1;
136 scsi_host->max_id = i2o_scsi_max_id;
137 scsi_host->max_lun = i2o_scsi_max_lun;
138 scsi_host->this_id = c->unit;
139 scsi_host->sg_tablesize = i2o_sg_tablesize(c, body_size);
141 i2o_shost = (struct i2o_scsi_host *)scsi_host->hostdata;
142 i2o_shost->scsi_host = scsi_host;
143 i2o_shost->iop = c;
144 i2o_shost->lun = 1;
146 i = 0;
147 list_for_each_entry(i2o_dev, &c->devices, list)
148 if (i2o_dev->lct_data.class_id == I2O_CLASS_BUS_ADAPTER) {
149 if (i2o_parm_field_get(i2o_dev, 0x0000, 0, &type, 1)
150 && (type == 0x01)) /* only SCSI bus */
151 i2o_shost->channel[i++] = i2o_dev;
153 if (i >= max_channel)
154 break;
157 return i2o_shost;
161 * i2o_scsi_get_host - Get an I2O SCSI host
162 * @c: I2O controller to for which to get the SCSI host
164 * If the I2O controller already exists as SCSI host, the SCSI host
165 * is returned, otherwise the I2O controller is added to the SCSI
166 * core.
168 * Returns pointer to the I2O SCSI host on success or NULL on failure.
170 static struct i2o_scsi_host *i2o_scsi_get_host(struct i2o_controller *c)
172 return c->driver_data[i2o_scsi_driver.context];
176 * i2o_scsi_remove - Remove I2O device from SCSI core
177 * @dev: device which should be removed
179 * Removes the I2O device from the SCSI core again.
181 * Returns 0 on success.
183 static int i2o_scsi_remove(struct device *dev)
185 struct i2o_device *i2o_dev = to_i2o_device(dev);
186 struct i2o_controller *c = i2o_dev->iop;
187 struct i2o_scsi_host *i2o_shost;
188 struct scsi_device *scsi_dev;
190 osm_info("device removed (TID: %03x)\n", i2o_dev->lct_data.tid);
192 i2o_shost = i2o_scsi_get_host(c);
194 shost_for_each_device(scsi_dev, i2o_shost->scsi_host)
195 if (scsi_dev->hostdata == i2o_dev) {
196 sysfs_remove_link(&i2o_dev->device.kobj, "scsi");
197 scsi_remove_device(scsi_dev);
198 scsi_device_put(scsi_dev);
199 break;
202 return 0;
206 * i2o_scsi_probe - verify if dev is a I2O SCSI device and install it
207 * @dev: device to verify if it is a I2O SCSI device
209 * Retrieve channel, id and lun for I2O device. If everthing goes well
210 * register the I2O device as SCSI device on the I2O SCSI controller.
212 * Returns 0 on success or negative error code on failure.
214 static int i2o_scsi_probe(struct device *dev)
216 struct i2o_device *i2o_dev = to_i2o_device(dev);
217 struct i2o_controller *c = i2o_dev->iop;
218 struct i2o_scsi_host *i2o_shost;
219 struct Scsi_Host *scsi_host;
220 struct i2o_device *parent;
221 struct scsi_device *scsi_dev;
222 u32 id = -1;
223 u64 lun = -1;
224 int channel = -1;
225 int i;
227 i2o_shost = i2o_scsi_get_host(c);
228 if (!i2o_shost)
229 return -EFAULT;
231 scsi_host = i2o_shost->scsi_host;
233 switch (i2o_dev->lct_data.class_id) {
234 case I2O_CLASS_RANDOM_BLOCK_STORAGE:
235 case I2O_CLASS_EXECUTIVE:
236 #ifdef CONFIG_I2O_EXT_ADAPTEC
237 if (c->adaptec) {
238 u8 type;
239 struct i2o_device *d = i2o_shost->channel[0];
241 if (i2o_parm_field_get(d, 0x0000, 0, &type, 1)
242 && (type == 0x01)) /* SCSI bus */
243 if (i2o_parm_field_get(d, 0x0200, 4, &id, 4)) {
244 channel = 0;
245 if (i2o_dev->lct_data.class_id ==
246 I2O_CLASS_RANDOM_BLOCK_STORAGE)
247 lun = i2o_shost->lun++;
248 else
249 lun = 0;
252 #endif
253 break;
255 case I2O_CLASS_SCSI_PERIPHERAL:
256 if (i2o_parm_field_get(i2o_dev, 0x0000, 3, &id, 4) < 0)
257 return -EFAULT;
259 if (i2o_parm_field_get(i2o_dev, 0x0000, 4, &lun, 8) < 0)
260 return -EFAULT;
262 parent = i2o_iop_find_device(c, i2o_dev->lct_data.parent_tid);
263 if (!parent) {
264 osm_warn("can not find parent of device %03x\n",
265 i2o_dev->lct_data.tid);
266 return -EFAULT;
269 for (i = 0; i <= i2o_shost->scsi_host->max_channel; i++)
270 if (i2o_shost->channel[i] == parent)
271 channel = i;
272 break;
274 default:
275 return -EFAULT;
278 if (channel == -1) {
279 osm_warn("can not find channel of device %03x\n",
280 i2o_dev->lct_data.tid);
281 return -EFAULT;
284 if (id >= scsi_host->max_id) {
285 osm_warn("SCSI device id (%d) >= max_id of I2O host (%d)", id,
286 scsi_host->max_id);
287 return -EFAULT;
290 if (lun >= scsi_host->max_lun) {
291 osm_warn("SCSI device id (%d) >= max_lun of I2O host (%d)",
292 (unsigned int)lun, scsi_host->max_lun);
293 return -EFAULT;
296 scsi_dev =
297 __scsi_add_device(i2o_shost->scsi_host, channel, id, lun, i2o_dev);
299 if (IS_ERR(scsi_dev)) {
300 osm_warn("can not add SCSI device %03x\n",
301 i2o_dev->lct_data.tid);
302 return PTR_ERR(scsi_dev);
305 sysfs_create_link(&i2o_dev->device.kobj, &scsi_dev->sdev_gendev.kobj,
306 "scsi");
308 osm_info("device added (TID: %03x) channel: %d, id: %d, lun: %d\n",
309 i2o_dev->lct_data.tid, channel, id, (unsigned int)lun);
311 return 0;
314 static const char *i2o_scsi_info(struct Scsi_Host *SChost)
316 struct i2o_scsi_host *hostdata;
317 hostdata = (struct i2o_scsi_host *)SChost->hostdata;
318 return hostdata->iop->name;
322 * i2o_scsi_reply - SCSI OSM message reply handler
323 * @c: controller issuing the reply
324 * @m: message id for flushing
325 * @msg: the message from the controller
327 * Process reply messages (interrupts in normal scsi controller think).
328 * We can get a variety of messages to process. The normal path is
329 * scsi command completions. We must also deal with IOP failures,
330 * the reply to a bus reset and the reply to a LUN query.
332 * Returns 0 on success and if the reply should not be flushed or > 0
333 * on success and if the reply should be flushed. Returns negative error
334 * code on failure and if the reply should be flushed.
336 static int i2o_scsi_reply(struct i2o_controller *c, u32 m,
337 struct i2o_message *msg)
339 struct scsi_cmnd *cmd;
340 u32 error;
341 struct device *dev;
343 cmd = i2o_cntxt_list_get(c, le32_to_cpu(msg->u.s.tcntxt));
344 if (unlikely(!cmd)) {
345 osm_err("NULL reply received!\n");
346 return -1;
350 * Low byte is device status, next is adapter status,
351 * (then one byte reserved), then request status.
353 error = le32_to_cpu(msg->body[0]);
355 osm_debug("Completed %ld\n", cmd->serial_number);
357 cmd->result = error & 0xff;
359 * if DeviceStatus is not SCSI_SUCCESS copy over the sense data and let
360 * the SCSI layer handle the error
362 if (cmd->result)
363 memcpy(cmd->sense_buffer, &msg->body[3],
364 min(sizeof(cmd->sense_buffer), (size_t) 40));
366 /* only output error code if AdapterStatus is not HBA_SUCCESS */
367 if ((error >> 8) & 0xff)
368 osm_err("SCSI error %08x\n", error);
370 dev = &c->pdev->dev;
371 if (cmd->use_sg)
372 dma_unmap_sg(dev, cmd->request_buffer, cmd->use_sg,
373 cmd->sc_data_direction);
374 else if (cmd->SCp.dma_handle)
375 dma_unmap_single(dev, cmd->SCp.dma_handle, cmd->request_bufflen,
376 cmd->sc_data_direction);
378 cmd->scsi_done(cmd);
380 return 1;
384 * i2o_scsi_notify_device_add - Retrieve notifications of added devices
385 * @i2o_dev: the I2O device which was added
387 * If a I2O device is added we catch the notification, because I2O classes
388 * other then SCSI peripheral will not be received through
389 * i2o_scsi_probe().
391 static void i2o_scsi_notify_device_add(struct i2o_device *i2o_dev)
393 switch (i2o_dev->lct_data.class_id) {
394 case I2O_CLASS_EXECUTIVE:
395 case I2O_CLASS_RANDOM_BLOCK_STORAGE:
396 i2o_scsi_probe(&i2o_dev->device);
397 break;
399 default:
400 break;
405 * i2o_scsi_notify_device_remove - Retrieve notifications of removed
406 * devices
407 * @i2o_dev: the I2O device which was removed
409 * If a I2O device is removed, we catch the notification to remove the
410 * corresponding SCSI device.
412 static void i2o_scsi_notify_device_remove(struct i2o_device *i2o_dev)
414 switch (i2o_dev->lct_data.class_id) {
415 case I2O_CLASS_EXECUTIVE:
416 case I2O_CLASS_RANDOM_BLOCK_STORAGE:
417 i2o_scsi_remove(&i2o_dev->device);
418 break;
420 default:
421 break;
426 * i2o_scsi_notify_controller_add - Retrieve notifications of added
427 * controllers
428 * @c: the controller which was added
430 * If a I2O controller is added, we catch the notification to add a
431 * corresponding Scsi_Host.
433 static void i2o_scsi_notify_controller_add(struct i2o_controller *c)
435 struct i2o_scsi_host *i2o_shost;
436 int rc;
438 i2o_shost = i2o_scsi_host_alloc(c);
439 if (IS_ERR(i2o_shost)) {
440 osm_err("Could not initialize SCSI host\n");
441 return;
444 rc = scsi_add_host(i2o_shost->scsi_host, &c->device);
445 if (rc) {
446 osm_err("Could not add SCSI host\n");
447 scsi_host_put(i2o_shost->scsi_host);
448 return;
451 c->driver_data[i2o_scsi_driver.context] = i2o_shost;
453 osm_debug("new I2O SCSI host added\n");
457 * i2o_scsi_notify_controller_remove - Retrieve notifications of removed
458 * controllers
459 * @c: the controller which was removed
461 * If a I2O controller is removed, we catch the notification to remove the
462 * corresponding Scsi_Host.
464 static void i2o_scsi_notify_controller_remove(struct i2o_controller *c)
466 struct i2o_scsi_host *i2o_shost;
467 i2o_shost = i2o_scsi_get_host(c);
468 if (!i2o_shost)
469 return;
471 c->driver_data[i2o_scsi_driver.context] = NULL;
473 scsi_remove_host(i2o_shost->scsi_host);
474 scsi_host_put(i2o_shost->scsi_host);
475 osm_debug("I2O SCSI host removed\n");
478 /* SCSI OSM driver struct */
479 static struct i2o_driver i2o_scsi_driver = {
480 .name = OSM_NAME,
481 .reply = i2o_scsi_reply,
482 .classes = i2o_scsi_class_id,
483 .notify_device_add = i2o_scsi_notify_device_add,
484 .notify_device_remove = i2o_scsi_notify_device_remove,
485 .notify_controller_add = i2o_scsi_notify_controller_add,
486 .notify_controller_remove = i2o_scsi_notify_controller_remove,
487 .driver = {
488 .probe = i2o_scsi_probe,
489 .remove = i2o_scsi_remove,
494 * i2o_scsi_queuecommand - queue a SCSI command
495 * @SCpnt: scsi command pointer
496 * @done: callback for completion
498 * Issue a scsi command asynchronously. Return 0 on success or 1 if
499 * we hit an error (normally message queue congestion). The only
500 * minor complication here is that I2O deals with the device addressing
501 * so we have to map the bus/dev/lun back to an I2O handle as well
502 * as faking absent devices ourself.
504 * Locks: takes the controller lock on error path only
507 static int i2o_scsi_queuecommand(struct scsi_cmnd *SCpnt,
508 void (*done) (struct scsi_cmnd *))
510 struct i2o_controller *c;
511 struct i2o_device *i2o_dev;
512 int tid;
513 struct i2o_message __iomem *msg;
514 u32 m;
516 * ENABLE_DISCONNECT
517 * SIMPLE_TAG
518 * RETURN_SENSE_DATA_IN_REPLY_MESSAGE_FRAME
520 u32 scsi_flags = 0x20a00000;
521 u32 sgl_offset;
522 u32 __iomem *mptr;
523 u32 cmd = I2O_CMD_SCSI_EXEC << 24;
524 int rc = 0;
527 * Do the incoming paperwork
529 i2o_dev = SCpnt->device->hostdata;
530 c = i2o_dev->iop;
532 SCpnt->scsi_done = done;
534 if (unlikely(!i2o_dev)) {
535 osm_warn("no I2O device in request\n");
536 SCpnt->result = DID_NO_CONNECT << 16;
537 done(SCpnt);
538 goto exit;
541 tid = i2o_dev->lct_data.tid;
543 osm_debug("qcmd: Tid = %03x\n", tid);
544 osm_debug("Real scsi messages.\n");
547 * Put together a scsi execscb message
549 switch (SCpnt->sc_data_direction) {
550 case PCI_DMA_NONE:
551 /* DATA NO XFER */
552 sgl_offset = SGL_OFFSET_0;
553 break;
555 case PCI_DMA_TODEVICE:
556 /* DATA OUT (iop-->dev) */
557 scsi_flags |= 0x80000000;
558 sgl_offset = SGL_OFFSET_10;
559 break;
561 case PCI_DMA_FROMDEVICE:
562 /* DATA IN (iop<--dev) */
563 scsi_flags |= 0x40000000;
564 sgl_offset = SGL_OFFSET_10;
565 break;
567 default:
568 /* Unknown - kill the command */
569 SCpnt->result = DID_NO_CONNECT << 16;
570 done(SCpnt);
571 goto exit;
575 * Obtain an I2O message. If there are none free then
576 * throw it back to the scsi layer
579 m = i2o_msg_get_wait(c, &msg, I2O_TIMEOUT_MESSAGE_GET);
580 if (m == I2O_QUEUE_EMPTY) {
581 rc = SCSI_MLQUEUE_HOST_BUSY;
582 goto exit;
585 mptr = &msg->body[0];
587 #ifdef CONFIG_I2O_EXT_ADAPTEC
588 if (c->adaptec) {
589 u32 adpt_flags = 0;
591 if (SCpnt->sc_request && SCpnt->sc_request->upper_private_data) {
592 i2o_sg_io_hdr_t __user *usr_ptr =
593 ((Sg_request *) (SCpnt->sc_request->
594 upper_private_data))->header.
595 usr_ptr;
597 if (usr_ptr)
598 get_user(adpt_flags, &usr_ptr->flags);
601 switch (i2o_dev->lct_data.class_id) {
602 case I2O_CLASS_EXECUTIVE:
603 case I2O_CLASS_RANDOM_BLOCK_STORAGE:
604 /* interpret flag has to be set for executive */
605 adpt_flags ^= I2O_DPT_SG_FLAG_INTERPRET;
606 break;
608 default:
609 break;
613 * for Adaptec controllers we use the PRIVATE command, because
614 * the normal SCSI EXEC doesn't support all SCSI commands on
615 * all controllers (for example READ CAPACITY).
617 if (sgl_offset == SGL_OFFSET_10)
618 sgl_offset = SGL_OFFSET_12;
619 cmd = I2O_CMD_PRIVATE << 24;
620 writel(I2O_VENDOR_DPT << 16 | I2O_CMD_SCSI_EXEC, mptr++);
621 writel(adpt_flags | tid, mptr++);
623 #endif
625 writel(cmd | HOST_TID << 12 | tid, &msg->u.head[1]);
626 writel(i2o_scsi_driver.context, &msg->u.s.icntxt);
628 /* We want the SCSI control block back */
629 writel(i2o_cntxt_list_add(c, SCpnt), &msg->u.s.tcntxt);
631 /* LSI_920_PCI_QUIRK
633 * Intermittant observations of msg frame word data corruption
634 * observed on msg[4] after:
635 * WRITE, READ-MODIFY-WRITE
636 * operations. 19990606 -sralston
638 * (Hence we build this word via tag. Its good practice anyway
639 * we don't want fetches over PCI needlessly)
642 /* Attach tags to the devices */
643 /* FIXME: implement
644 if(SCpnt->device->tagged_supported) {
645 if(SCpnt->tag == HEAD_OF_QUEUE_TAG)
646 scsi_flags |= 0x01000000;
647 else if(SCpnt->tag == ORDERED_QUEUE_TAG)
648 scsi_flags |= 0x01800000;
652 writel(scsi_flags | SCpnt->cmd_len, mptr++);
654 /* Write SCSI command into the message - always 16 byte block */
655 memcpy_toio(mptr, SCpnt->cmnd, 16);
656 mptr += 4;
658 if (sgl_offset != SGL_OFFSET_0) {
659 /* write size of data addressed by SGL */
660 writel(SCpnt->request_bufflen, mptr++);
662 /* Now fill in the SGList and command */
663 if (SCpnt->use_sg) {
664 if (!i2o_dma_map_sg(c, SCpnt->request_buffer,
665 SCpnt->use_sg,
666 SCpnt->sc_data_direction, &mptr))
667 goto nomem;
668 } else {
669 SCpnt->SCp.dma_handle =
670 i2o_dma_map_single(c, SCpnt->request_buffer,
671 SCpnt->request_bufflen,
672 SCpnt->sc_data_direction, &mptr);
673 if (dma_mapping_error(SCpnt->SCp.dma_handle))
674 goto nomem;
678 /* Stick the headers on */
679 writel(I2O_MESSAGE_SIZE(mptr - &msg->u.head[0]) | sgl_offset,
680 &msg->u.head[0]);
682 /* Queue the message */
683 i2o_msg_post(c, m);
685 osm_debug("Issued %ld\n", SCpnt->serial_number);
687 return 0;
689 nomem:
690 rc = -ENOMEM;
691 i2o_msg_nop(c, m);
693 exit:
694 return rc;
698 * i2o_scsi_abort - abort a running command
699 * @SCpnt: command to abort
701 * Ask the I2O controller to abort a command. This is an asynchrnous
702 * process and our callback handler will see the command complete with an
703 * aborted message if it succeeds.
705 * Returns 0 if the command is successfully aborted or negative error code
706 * on failure.
708 static int i2o_scsi_abort(struct scsi_cmnd *SCpnt)
710 struct i2o_device *i2o_dev;
711 struct i2o_controller *c;
712 struct i2o_message __iomem *msg;
713 u32 m;
714 int tid;
715 int status = FAILED;
717 osm_warn("Aborting command block.\n");
719 i2o_dev = SCpnt->device->hostdata;
720 c = i2o_dev->iop;
721 tid = i2o_dev->lct_data.tid;
723 m = i2o_msg_get_wait(c, &msg, I2O_TIMEOUT_MESSAGE_GET);
724 if (m == I2O_QUEUE_EMPTY)
725 return SCSI_MLQUEUE_HOST_BUSY;
727 writel(FIVE_WORD_MSG_SIZE | SGL_OFFSET_0, &msg->u.head[0]);
728 writel(I2O_CMD_SCSI_ABORT << 24 | HOST_TID << 12 | tid,
729 &msg->u.head[1]);
730 writel(i2o_cntxt_list_get_ptr(c, SCpnt), &msg->body[0]);
732 if (i2o_msg_post_wait(c, m, I2O_TIMEOUT_SCSI_SCB_ABORT))
733 status = SUCCESS;
735 return status;
739 * i2o_scsi_bios_param - Invent disk geometry
740 * @sdev: scsi device
741 * @dev: block layer device
742 * @capacity: size in sectors
743 * @ip: geometry array
745 * This is anyones guess quite frankly. We use the same rules everyone
746 * else appears to and hope. It seems to work.
749 static int i2o_scsi_bios_param(struct scsi_device *sdev,
750 struct block_device *dev, sector_t capacity,
751 int *ip)
753 int size;
755 size = capacity;
756 ip[0] = 64; /* heads */
757 ip[1] = 32; /* sectors */
758 if ((ip[2] = size >> 11) > 1024) { /* cylinders, test for big disk */
759 ip[0] = 255; /* heads */
760 ip[1] = 63; /* sectors */
761 ip[2] = size / (255 * 63); /* cylinders */
763 return 0;
766 static struct scsi_host_template i2o_scsi_host_template = {
767 .proc_name = OSM_NAME,
768 .name = OSM_DESCRIPTION,
769 .info = i2o_scsi_info,
770 .queuecommand = i2o_scsi_queuecommand,
771 .eh_abort_handler = i2o_scsi_abort,
772 .bios_param = i2o_scsi_bios_param,
773 .can_queue = I2O_SCSI_CAN_QUEUE,
774 .sg_tablesize = 8,
775 .cmd_per_lun = 6,
776 .use_clustering = ENABLE_CLUSTERING,
780 * i2o_scsi_init - SCSI OSM initialization function
782 * Register SCSI OSM into I2O core.
784 * Returns 0 on success or negative error code on failure.
786 static int __init i2o_scsi_init(void)
788 int rc;
790 printk(KERN_INFO OSM_DESCRIPTION " v" OSM_VERSION "\n");
792 /* Register SCSI OSM into I2O core */
793 rc = i2o_driver_register(&i2o_scsi_driver);
794 if (rc) {
795 osm_err("Could not register SCSI driver\n");
796 return rc;
799 return 0;
803 * i2o_scsi_exit - SCSI OSM exit function
805 * Unregisters SCSI OSM from I2O core.
807 static void __exit i2o_scsi_exit(void)
809 /* Unregister I2O SCSI OSM from I2O core */
810 i2o_driver_unregister(&i2o_scsi_driver);
813 MODULE_AUTHOR("Red Hat Software");
814 MODULE_LICENSE("GPL");
815 MODULE_DESCRIPTION(OSM_DESCRIPTION);
816 MODULE_VERSION(OSM_VERSION);
818 module_init(i2o_scsi_init);
819 module_exit(i2o_scsi_exit);