2 * SBP2 driver (SCSI over IEEE1394)
4 * Copyright (C) 2005-2007 Kristian Hoegsberg <krh@bitplanet.net>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software Foundation,
18 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
22 * The basic structure of this driver is based on the old storage driver,
23 * drivers/ieee1394/sbp2.c, originally written by
24 * James Goodwin <jamesg@filanet.com>
25 * with later contributions and ongoing maintenance from
26 * Ben Collins <bcollins@debian.org>,
27 * Stefan Richter <stefanr@s5r6.in-berlin.de>
31 #include <linux/kernel.h>
32 #include <linux/module.h>
33 #include <linux/moduleparam.h>
34 #include <linux/mod_devicetable.h>
35 #include <linux/device.h>
36 #include <linux/scatterlist.h>
37 #include <linux/dma-mapping.h>
38 #include <linux/blkdev.h>
39 #include <linux/string.h>
40 #include <linux/stringify.h>
41 #include <linux/timer.h>
42 #include <linux/workqueue.h>
44 #include <scsi/scsi.h>
45 #include <scsi/scsi_cmnd.h>
46 #include <scsi/scsi_device.h>
47 #include <scsi/scsi_host.h>
49 #include "fw-transaction.h"
50 #include "fw-topology.h"
51 #include "fw-device.h"
54 * So far only bridges from Oxford Semiconductor are known to support
55 * concurrent logins. Depending on firmware, four or two concurrent logins
56 * are possible on OXFW911 and newer Oxsemi bridges.
58 * Concurrent logins are useful together with cluster filesystems.
60 static int sbp2_param_exclusive_login = 1;
61 module_param_named(exclusive_login, sbp2_param_exclusive_login, bool, 0644);
62 MODULE_PARM_DESC(exclusive_login, "Exclusive login to sbp2 device "
63 "(default = Y, use N for concurrent initiators)");
66 * Flags for firmware oddities
68 * - 128kB max transfer
69 * Limit transfer size. Necessary for some old bridges.
72 * When scsi_mod probes the device, let the inquiry command look like that
76 * Suppress sending of mode_sense for mode page 8 if the device pretends to
77 * support the SCSI Primary Block commands instead of Reduced Block Commands.
80 * Tell sd_mod to correct the last sector number reported by read_capacity.
81 * Avoids access beyond actual disk limits on devices with an off-by-one bug.
82 * Don't use this with devices which don't have this bug.
84 * - override internal blacklist
85 * Instead of adding to the built-in blacklist, use only the workarounds
86 * specified in the module load parameter.
87 * Useful if a blacklist entry interfered with a non-broken device.
89 #define SBP2_WORKAROUND_128K_MAX_TRANS 0x1
90 #define SBP2_WORKAROUND_INQUIRY_36 0x2
91 #define SBP2_WORKAROUND_MODE_SENSE_8 0x4
92 #define SBP2_WORKAROUND_FIX_CAPACITY 0x8
93 #define SBP2_WORKAROUND_OVERRIDE 0x100
95 static int sbp2_param_workarounds;
96 module_param_named(workarounds, sbp2_param_workarounds, int, 0644);
97 MODULE_PARM_DESC(workarounds, "Work around device bugs (default = 0"
98 ", 128kB max transfer = " __stringify(SBP2_WORKAROUND_128K_MAX_TRANS)
99 ", 36 byte inquiry = " __stringify(SBP2_WORKAROUND_INQUIRY_36)
100 ", skip mode page 8 = " __stringify(SBP2_WORKAROUND_MODE_SENSE_8)
101 ", fix capacity = " __stringify(SBP2_WORKAROUND_FIX_CAPACITY)
102 ", override internal blacklist = " __stringify(SBP2_WORKAROUND_OVERRIDE)
103 ", or a combination)");
105 /* I don't know why the SCSI stack doesn't define something like this... */
106 typedef void (*scsi_done_fn_t)(struct scsi_cmnd *);
108 static const char sbp2_driver_name[] = "sbp2";
111 * We create one struct sbp2_logical_unit per SBP-2 Logical Unit Number Entry
112 * and one struct scsi_device per sbp2_logical_unit.
114 struct sbp2_logical_unit {
115 struct sbp2_target *tgt;
116 struct list_head link;
117 struct scsi_device *sdev;
118 struct fw_address_handler address_handler;
119 struct list_head orb_list;
121 u64 command_block_agent_address;
126 * The generation is updated once we've logged in or reconnected
127 * to the logical unit. Thus, I/O to the device will automatically
128 * fail and get retried if it happens in a window where the device
129 * is not ready, e.g. after a bus reset but before we reconnect.
133 struct delayed_work work;
137 * We create one struct sbp2_target per IEEE 1212 Unit Directory
138 * and one struct Scsi_Host per sbp2_target.
142 struct fw_unit *unit;
144 u64 management_agent_address;
149 unsigned workarounds;
150 struct list_head lu_list;
153 #define SBP2_MAX_SG_ELEMENT_LENGTH 0xf000
154 #define SBP2_ORB_TIMEOUT 2000 /* Timeout in ms */
155 #define SBP2_ORB_NULL 0x80000000
157 #define SBP2_DIRECTION_TO_MEDIA 0x0
158 #define SBP2_DIRECTION_FROM_MEDIA 0x1
160 /* Unit directory keys */
161 #define SBP2_CSR_FIRMWARE_REVISION 0x3c
162 #define SBP2_CSR_LOGICAL_UNIT_NUMBER 0x14
163 #define SBP2_CSR_LOGICAL_UNIT_DIRECTORY 0xd4
165 /* Management orb opcodes */
166 #define SBP2_LOGIN_REQUEST 0x0
167 #define SBP2_QUERY_LOGINS_REQUEST 0x1
168 #define SBP2_RECONNECT_REQUEST 0x3
169 #define SBP2_SET_PASSWORD_REQUEST 0x4
170 #define SBP2_LOGOUT_REQUEST 0x7
171 #define SBP2_ABORT_TASK_REQUEST 0xb
172 #define SBP2_ABORT_TASK_SET 0xc
173 #define SBP2_LOGICAL_UNIT_RESET 0xe
174 #define SBP2_TARGET_RESET_REQUEST 0xf
176 /* Offsets for command block agent registers */
177 #define SBP2_AGENT_STATE 0x00
178 #define SBP2_AGENT_RESET 0x04
179 #define SBP2_ORB_POINTER 0x08
180 #define SBP2_DOORBELL 0x10
181 #define SBP2_UNSOLICITED_STATUS_ENABLE 0x14
183 /* Status write response codes */
184 #define SBP2_STATUS_REQUEST_COMPLETE 0x0
185 #define SBP2_STATUS_TRANSPORT_FAILURE 0x1
186 #define SBP2_STATUS_ILLEGAL_REQUEST 0x2
187 #define SBP2_STATUS_VENDOR_DEPENDENT 0x3
189 #define STATUS_GET_ORB_HIGH(v) ((v).status & 0xffff)
190 #define STATUS_GET_SBP_STATUS(v) (((v).status >> 16) & 0xff)
191 #define STATUS_GET_LEN(v) (((v).status >> 24) & 0x07)
192 #define STATUS_GET_DEAD(v) (((v).status >> 27) & 0x01)
193 #define STATUS_GET_RESPONSE(v) (((v).status >> 28) & 0x03)
194 #define STATUS_GET_SOURCE(v) (((v).status >> 30) & 0x03)
195 #define STATUS_GET_ORB_LOW(v) ((v).orb_low)
196 #define STATUS_GET_DATA(v) ((v).data)
204 struct sbp2_pointer {
210 struct fw_transaction t;
212 dma_addr_t request_bus;
214 struct sbp2_pointer pointer;
215 void (*callback)(struct sbp2_orb * orb, struct sbp2_status * status);
216 struct list_head link;
219 #define MANAGEMENT_ORB_LUN(v) ((v))
220 #define MANAGEMENT_ORB_FUNCTION(v) ((v) << 16)
221 #define MANAGEMENT_ORB_RECONNECT(v) ((v) << 20)
222 #define MANAGEMENT_ORB_EXCLUSIVE(v) ((v) ? 1 << 28 : 0)
223 #define MANAGEMENT_ORB_REQUEST_FORMAT(v) ((v) << 29)
224 #define MANAGEMENT_ORB_NOTIFY ((1) << 31)
226 #define MANAGEMENT_ORB_RESPONSE_LENGTH(v) ((v))
227 #define MANAGEMENT_ORB_PASSWORD_LENGTH(v) ((v) << 16)
229 struct sbp2_management_orb {
230 struct sbp2_orb base;
232 struct sbp2_pointer password;
233 struct sbp2_pointer response;
236 struct sbp2_pointer status_fifo;
239 dma_addr_t response_bus;
240 struct completion done;
241 struct sbp2_status status;
244 #define LOGIN_RESPONSE_GET_LOGIN_ID(v) ((v).misc & 0xffff)
245 #define LOGIN_RESPONSE_GET_LENGTH(v) (((v).misc >> 16) & 0xffff)
247 struct sbp2_login_response {
249 struct sbp2_pointer command_block_agent;
252 #define COMMAND_ORB_DATA_SIZE(v) ((v))
253 #define COMMAND_ORB_PAGE_SIZE(v) ((v) << 16)
254 #define COMMAND_ORB_PAGE_TABLE_PRESENT ((1) << 19)
255 #define COMMAND_ORB_MAX_PAYLOAD(v) ((v) << 20)
256 #define COMMAND_ORB_SPEED(v) ((v) << 24)
257 #define COMMAND_ORB_DIRECTION(v) ((v) << 27)
258 #define COMMAND_ORB_REQUEST_FORMAT(v) ((v) << 29)
259 #define COMMAND_ORB_NOTIFY ((1) << 31)
261 struct sbp2_command_orb {
262 struct sbp2_orb base;
264 struct sbp2_pointer next;
265 struct sbp2_pointer data_descriptor;
267 u8 command_block[12];
269 struct scsi_cmnd *cmd;
271 struct sbp2_logical_unit *lu;
273 struct sbp2_pointer page_table[SG_ALL] __attribute__((aligned(8)));
274 dma_addr_t page_table_bus;
278 * List of devices with known bugs.
280 * The firmware_revision field, masked with 0xffff00, is the best
281 * indicator for the type of bridge chip of a device. It yields a few
282 * false positives but this did not break correctly behaving devices
283 * so far. We use ~0 as a wildcard, since the 24 bit values we get
284 * from the config rom can never match that.
286 static const struct {
287 u32 firmware_revision;
289 unsigned workarounds;
290 } sbp2_workarounds_table[] = {
291 /* DViCO Momobay CX-1 with TSB42AA9 bridge */ {
292 .firmware_revision = 0x002800,
294 .workarounds = SBP2_WORKAROUND_INQUIRY_36 |
295 SBP2_WORKAROUND_MODE_SENSE_8,
297 /* Initio bridges, actually only needed for some older ones */ {
298 .firmware_revision = 0x000200,
300 .workarounds = SBP2_WORKAROUND_INQUIRY_36,
302 /* Symbios bridge */ {
303 .firmware_revision = 0xa0b800,
305 .workarounds = SBP2_WORKAROUND_128K_MAX_TRANS,
309 * There are iPods (2nd gen, 3rd gen) with model_id == 0, but
310 * these iPods do not feature the read_capacity bug according
311 * to one report. Read_capacity behaviour as well as model_id
312 * could change due to Apple-supplied firmware updates though.
315 /* iPod 4th generation. */ {
316 .firmware_revision = 0x0a2700,
318 .workarounds = SBP2_WORKAROUND_FIX_CAPACITY,
321 .firmware_revision = 0x0a2700,
323 .workarounds = SBP2_WORKAROUND_FIX_CAPACITY,
326 .firmware_revision = 0x0a2700,
328 .workarounds = SBP2_WORKAROUND_FIX_CAPACITY,
333 free_orb(struct kref *kref)
335 struct sbp2_orb *orb = container_of(kref, struct sbp2_orb, kref);
341 sbp2_status_write(struct fw_card *card, struct fw_request *request,
342 int tcode, int destination, int source,
343 int generation, int speed,
344 unsigned long long offset,
345 void *payload, size_t length, void *callback_data)
347 struct sbp2_logical_unit *lu = callback_data;
348 struct sbp2_orb *orb;
349 struct sbp2_status status;
353 if (tcode != TCODE_WRITE_BLOCK_REQUEST ||
354 length == 0 || length > sizeof(status)) {
355 fw_send_response(card, request, RCODE_TYPE_ERROR);
359 header_size = min(length, 2 * sizeof(u32));
360 fw_memcpy_from_be32(&status, payload, header_size);
361 if (length > header_size)
362 memcpy(status.data, payload + 8, length - header_size);
363 if (STATUS_GET_SOURCE(status) == 2 || STATUS_GET_SOURCE(status) == 3) {
364 fw_notify("non-orb related status write, not handled\n");
365 fw_send_response(card, request, RCODE_COMPLETE);
369 /* Lookup the orb corresponding to this status write. */
370 spin_lock_irqsave(&card->lock, flags);
371 list_for_each_entry(orb, &lu->orb_list, link) {
372 if (STATUS_GET_ORB_HIGH(status) == 0 &&
373 STATUS_GET_ORB_LOW(status) == orb->request_bus) {
374 orb->rcode = RCODE_COMPLETE;
375 list_del(&orb->link);
379 spin_unlock_irqrestore(&card->lock, flags);
381 if (&orb->link != &lu->orb_list)
382 orb->callback(orb, &status);
384 fw_error("status write for unknown orb\n");
386 kref_put(&orb->kref, free_orb);
388 fw_send_response(card, request, RCODE_COMPLETE);
392 complete_transaction(struct fw_card *card, int rcode,
393 void *payload, size_t length, void *data)
395 struct sbp2_orb *orb = data;
399 * This is a little tricky. We can get the status write for
400 * the orb before we get this callback. The status write
401 * handler above will assume the orb pointer transaction was
402 * successful and set the rcode to RCODE_COMPLETE for the orb.
403 * So this callback only sets the rcode if it hasn't already
404 * been set and only does the cleanup if the transaction
405 * failed and we didn't already get a status write.
407 spin_lock_irqsave(&card->lock, flags);
409 if (orb->rcode == -1)
411 if (orb->rcode != RCODE_COMPLETE) {
412 list_del(&orb->link);
413 spin_unlock_irqrestore(&card->lock, flags);
414 orb->callback(orb, NULL);
416 spin_unlock_irqrestore(&card->lock, flags);
419 kref_put(&orb->kref, free_orb);
423 sbp2_send_orb(struct sbp2_orb *orb, struct sbp2_logical_unit *lu,
424 int node_id, int generation, u64 offset)
426 struct fw_device *device = fw_device(lu->tgt->unit->device.parent);
429 orb->pointer.high = 0;
430 orb->pointer.low = orb->request_bus;
431 fw_memcpy_to_be32(&orb->pointer, &orb->pointer, sizeof(orb->pointer));
433 spin_lock_irqsave(&device->card->lock, flags);
434 list_add_tail(&orb->link, &lu->orb_list);
435 spin_unlock_irqrestore(&device->card->lock, flags);
437 /* Take a ref for the orb list and for the transaction callback. */
438 kref_get(&orb->kref);
439 kref_get(&orb->kref);
441 fw_send_request(device->card, &orb->t, TCODE_WRITE_BLOCK_REQUEST,
442 node_id, generation, device->max_speed, offset,
443 &orb->pointer, sizeof(orb->pointer),
444 complete_transaction, orb);
447 static int sbp2_cancel_orbs(struct sbp2_logical_unit *lu)
449 struct fw_device *device = fw_device(lu->tgt->unit->device.parent);
450 struct sbp2_orb *orb, *next;
451 struct list_head list;
453 int retval = -ENOENT;
455 INIT_LIST_HEAD(&list);
456 spin_lock_irqsave(&device->card->lock, flags);
457 list_splice_init(&lu->orb_list, &list);
458 spin_unlock_irqrestore(&device->card->lock, flags);
460 list_for_each_entry_safe(orb, next, &list, link) {
462 if (fw_cancel_transaction(device->card, &orb->t) == 0)
465 orb->rcode = RCODE_CANCELLED;
466 orb->callback(orb, NULL);
473 complete_management_orb(struct sbp2_orb *base_orb, struct sbp2_status *status)
475 struct sbp2_management_orb *orb =
476 container_of(base_orb, struct sbp2_management_orb, base);
479 memcpy(&orb->status, status, sizeof(*status));
480 complete(&orb->done);
484 sbp2_send_management_orb(struct sbp2_logical_unit *lu, int node_id,
485 int generation, int function, int lun_or_login_id,
488 struct fw_device *device = fw_device(lu->tgt->unit->device.parent);
489 struct sbp2_management_orb *orb;
490 int retval = -ENOMEM;
492 orb = kzalloc(sizeof(*orb), GFP_ATOMIC);
496 kref_init(&orb->base.kref);
498 dma_map_single(device->card->device, &orb->response,
499 sizeof(orb->response), DMA_FROM_DEVICE);
500 if (dma_mapping_error(orb->response_bus))
501 goto fail_mapping_response;
503 orb->request.response.high = 0;
504 orb->request.response.low = orb->response_bus;
507 MANAGEMENT_ORB_NOTIFY |
508 MANAGEMENT_ORB_FUNCTION(function) |
509 MANAGEMENT_ORB_LUN(lun_or_login_id);
510 orb->request.length =
511 MANAGEMENT_ORB_RESPONSE_LENGTH(sizeof(orb->response));
513 orb->request.status_fifo.high = lu->address_handler.offset >> 32;
514 orb->request.status_fifo.low = lu->address_handler.offset;
516 if (function == SBP2_LOGIN_REQUEST) {
517 /* Ask for 2^2 == 4 seconds reconnect grace period */
519 MANAGEMENT_ORB_RECONNECT(2) |
520 MANAGEMENT_ORB_EXCLUSIVE(sbp2_param_exclusive_login);
523 fw_memcpy_to_be32(&orb->request, &orb->request, sizeof(orb->request));
525 init_completion(&orb->done);
526 orb->base.callback = complete_management_orb;
528 orb->base.request_bus =
529 dma_map_single(device->card->device, &orb->request,
530 sizeof(orb->request), DMA_TO_DEVICE);
531 if (dma_mapping_error(orb->base.request_bus))
532 goto fail_mapping_request;
534 sbp2_send_orb(&orb->base, lu, node_id, generation,
535 lu->tgt->management_agent_address);
537 wait_for_completion_timeout(&orb->done,
538 msecs_to_jiffies(SBP2_ORB_TIMEOUT));
541 if (sbp2_cancel_orbs(lu) == 0) {
542 fw_error("orb reply timed out, rcode=0x%02x\n",
547 if (orb->base.rcode != RCODE_COMPLETE) {
548 fw_error("management write failed, rcode 0x%02x\n",
553 if (STATUS_GET_RESPONSE(orb->status) != 0 ||
554 STATUS_GET_SBP_STATUS(orb->status) != 0) {
555 fw_error("error status: %d:%d\n",
556 STATUS_GET_RESPONSE(orb->status),
557 STATUS_GET_SBP_STATUS(orb->status));
563 dma_unmap_single(device->card->device, orb->base.request_bus,
564 sizeof(orb->request), DMA_TO_DEVICE);
565 fail_mapping_request:
566 dma_unmap_single(device->card->device, orb->response_bus,
567 sizeof(orb->response), DMA_FROM_DEVICE);
568 fail_mapping_response:
570 fw_memcpy_from_be32(response,
571 orb->response, sizeof(orb->response));
572 kref_put(&orb->base.kref, free_orb);
578 complete_agent_reset_write(struct fw_card *card, int rcode,
579 void *payload, size_t length, void *data)
581 struct fw_transaction *t = data;
586 static int sbp2_agent_reset(struct sbp2_logical_unit *lu)
588 struct fw_device *device = fw_device(lu->tgt->unit->device.parent);
589 struct fw_transaction *t;
592 t = kzalloc(sizeof(*t), GFP_ATOMIC);
596 fw_send_request(device->card, t, TCODE_WRITE_QUADLET_REQUEST,
597 lu->tgt->node_id, lu->generation, device->max_speed,
598 lu->command_block_agent_address + SBP2_AGENT_RESET,
599 &zero, sizeof(zero), complete_agent_reset_write, t);
604 static void sbp2_release_target(struct kref *kref)
606 struct sbp2_target *tgt = container_of(kref, struct sbp2_target, kref);
607 struct sbp2_logical_unit *lu, *next;
608 struct Scsi_Host *shost =
609 container_of((void *)tgt, struct Scsi_Host, hostdata[0]);
610 struct fw_device *device = fw_device(tgt->unit->device.parent);
612 list_for_each_entry_safe(lu, next, &tgt->lu_list, link) {
614 scsi_remove_device(lu->sdev);
616 if (!fw_device_is_shutdown(device))
617 sbp2_send_management_orb(lu, tgt->node_id,
618 lu->generation, SBP2_LOGOUT_REQUEST,
621 fw_core_remove_address_handler(&lu->address_handler);
625 scsi_remove_host(shost);
626 fw_notify("released %s\n", tgt->unit->device.bus_id);
628 put_device(&tgt->unit->device);
629 scsi_host_put(shost);
632 static struct workqueue_struct *sbp2_wq;
635 * Always get the target's kref when scheduling work on one its units.
636 * Each workqueue job is responsible to call sbp2_target_put() upon return.
638 static void sbp2_queue_work(struct sbp2_logical_unit *lu, unsigned long delay)
640 if (queue_delayed_work(sbp2_wq, &lu->work, delay))
641 kref_get(&lu->tgt->kref);
644 static void sbp2_target_put(struct sbp2_target *tgt)
646 kref_put(&tgt->kref, sbp2_release_target);
649 static void sbp2_reconnect(struct work_struct *work);
651 static void sbp2_login(struct work_struct *work)
653 struct sbp2_logical_unit *lu =
654 container_of(work, struct sbp2_logical_unit, work.work);
655 struct Scsi_Host *shost =
656 container_of((void *)lu->tgt, struct Scsi_Host, hostdata[0]);
657 struct scsi_device *sdev;
658 struct scsi_lun eight_bytes_lun;
659 struct fw_unit *unit = lu->tgt->unit;
660 struct fw_device *device = fw_device(unit->device.parent);
661 struct sbp2_login_response response;
662 int generation, node_id, local_node_id;
664 generation = device->card->generation;
665 node_id = device->node->node_id;
666 local_node_id = device->card->local_node->node_id;
668 if (sbp2_send_management_orb(lu, node_id, generation,
669 SBP2_LOGIN_REQUEST, lu->lun, &response) < 0) {
670 if (lu->retries++ < 5)
671 sbp2_queue_work(lu, DIV_ROUND_UP(HZ, 5));
673 fw_error("failed to login to %s LUN %04x\n",
674 unit->device.bus_id, lu->lun);
678 lu->generation = generation;
679 lu->tgt->node_id = node_id;
680 lu->tgt->address_high = local_node_id << 16;
682 /* Get command block agent offset and login id. */
683 lu->command_block_agent_address =
684 ((u64) (response.command_block_agent.high & 0xffff) << 32) |
685 response.command_block_agent.low;
686 lu->login_id = LOGIN_RESPONSE_GET_LOGIN_ID(response);
688 fw_notify("logged in to %s LUN %04x (%d retries)\n",
689 unit->device.bus_id, lu->lun, lu->retries);
692 /* FIXME: The linux1394 sbp2 does this last step. */
693 sbp2_set_busy_timeout(scsi_id);
696 PREPARE_DELAYED_WORK(&lu->work, sbp2_reconnect);
697 sbp2_agent_reset(lu);
699 memset(&eight_bytes_lun, 0, sizeof(eight_bytes_lun));
700 eight_bytes_lun.scsi_lun[0] = (lu->lun >> 8) & 0xff;
701 eight_bytes_lun.scsi_lun[1] = lu->lun & 0xff;
703 sdev = __scsi_add_device(shost, 0, 0,
704 scsilun_to_int(&eight_bytes_lun), lu);
706 sbp2_send_management_orb(lu, node_id, generation,
707 SBP2_LOGOUT_REQUEST, lu->login_id, NULL);
709 * Set this back to sbp2_login so we fall back and
710 * retry login on bus reset.
712 PREPARE_DELAYED_WORK(&lu->work, sbp2_login);
715 scsi_device_put(sdev);
718 sbp2_target_put(lu->tgt);
721 static int sbp2_add_logical_unit(struct sbp2_target *tgt, int lun_entry)
723 struct sbp2_logical_unit *lu;
725 lu = kmalloc(sizeof(*lu), GFP_KERNEL);
729 lu->address_handler.length = 0x100;
730 lu->address_handler.address_callback = sbp2_status_write;
731 lu->address_handler.callback_data = lu;
733 if (fw_core_add_address_handler(&lu->address_handler,
734 &fw_high_memory_region) < 0) {
741 lu->lun = lun_entry & 0xffff;
743 INIT_LIST_HEAD(&lu->orb_list);
744 INIT_DELAYED_WORK(&lu->work, sbp2_login);
746 list_add_tail(&lu->link, &tgt->lu_list);
750 static int sbp2_scan_logical_unit_dir(struct sbp2_target *tgt, u32 *directory)
752 struct fw_csr_iterator ci;
755 fw_csr_iterator_init(&ci, directory);
756 while (fw_csr_iterator_next(&ci, &key, &value))
757 if (key == SBP2_CSR_LOGICAL_UNIT_NUMBER &&
758 sbp2_add_logical_unit(tgt, value) < 0)
763 static int sbp2_scan_unit_dir(struct sbp2_target *tgt, u32 *directory,
764 u32 *model, u32 *firmware_revision)
766 struct fw_csr_iterator ci;
769 fw_csr_iterator_init(&ci, directory);
770 while (fw_csr_iterator_next(&ci, &key, &value)) {
773 case CSR_DEPENDENT_INFO | CSR_OFFSET:
774 tgt->management_agent_address =
775 CSR_REGISTER_BASE + 4 * value;
778 case CSR_DIRECTORY_ID:
779 tgt->directory_id = value;
786 case SBP2_CSR_FIRMWARE_REVISION:
787 *firmware_revision = value;
790 case SBP2_CSR_LOGICAL_UNIT_NUMBER:
791 if (sbp2_add_logical_unit(tgt, value) < 0)
795 case SBP2_CSR_LOGICAL_UNIT_DIRECTORY:
796 if (sbp2_scan_logical_unit_dir(tgt, ci.p + value) < 0)
804 static void sbp2_init_workarounds(struct sbp2_target *tgt, u32 model,
805 u32 firmware_revision)
808 unsigned w = sbp2_param_workarounds;
811 fw_notify("Please notify linux1394-devel@lists.sourceforge.net "
812 "if you need the workarounds parameter for %s\n",
813 tgt->unit->device.bus_id);
815 if (w & SBP2_WORKAROUND_OVERRIDE)
818 for (i = 0; i < ARRAY_SIZE(sbp2_workarounds_table); i++) {
820 if (sbp2_workarounds_table[i].firmware_revision !=
821 (firmware_revision & 0xffffff00))
824 if (sbp2_workarounds_table[i].model != model &&
825 sbp2_workarounds_table[i].model != ~0)
828 w |= sbp2_workarounds_table[i].workarounds;
833 fw_notify("Workarounds for %s: 0x%x "
834 "(firmware_revision 0x%06x, model_id 0x%06x)\n",
835 tgt->unit->device.bus_id,
836 w, firmware_revision, model);
837 tgt->workarounds = w;
840 static struct scsi_host_template scsi_driver_template;
842 static int sbp2_probe(struct device *dev)
844 struct fw_unit *unit = fw_unit(dev);
845 struct fw_device *device = fw_device(unit->device.parent);
846 struct sbp2_target *tgt;
847 struct sbp2_logical_unit *lu;
848 struct Scsi_Host *shost;
849 u32 model, firmware_revision;
851 shost = scsi_host_alloc(&scsi_driver_template, sizeof(*tgt));
855 tgt = (struct sbp2_target *)shost->hostdata;
856 unit->device.driver_data = tgt;
858 kref_init(&tgt->kref);
859 INIT_LIST_HEAD(&tgt->lu_list);
861 if (fw_device_enable_phys_dma(device) < 0)
864 if (scsi_add_host(shost, &unit->device) < 0)
867 /* Initialize to values that won't match anything in our table. */
868 firmware_revision = 0xff000000;
871 /* implicit directory ID */
872 tgt->directory_id = ((unit->directory - device->config_rom) * 4
873 + CSR_CONFIG_ROM) & 0xffffff;
875 if (sbp2_scan_unit_dir(tgt, unit->directory, &model,
876 &firmware_revision) < 0)
879 sbp2_init_workarounds(tgt, model, firmware_revision);
881 get_device(&unit->device);
883 /* Do the login in a workqueue so we can easily reschedule retries. */
884 list_for_each_entry(lu, &tgt->lu_list, link)
885 sbp2_queue_work(lu, 0);
889 sbp2_target_put(tgt);
893 scsi_host_put(shost);
897 static int sbp2_remove(struct device *dev)
899 struct fw_unit *unit = fw_unit(dev);
900 struct sbp2_target *tgt = unit->device.driver_data;
902 sbp2_target_put(tgt);
906 static void sbp2_reconnect(struct work_struct *work)
908 struct sbp2_logical_unit *lu =
909 container_of(work, struct sbp2_logical_unit, work.work);
910 struct fw_unit *unit = lu->tgt->unit;
911 struct fw_device *device = fw_device(unit->device.parent);
912 int generation, node_id, local_node_id;
914 generation = device->card->generation;
915 node_id = device->node->node_id;
916 local_node_id = device->card->local_node->node_id;
918 if (sbp2_send_management_orb(lu, node_id, generation,
919 SBP2_RECONNECT_REQUEST,
920 lu->login_id, NULL) < 0) {
921 if (lu->retries++ >= 5) {
922 fw_error("failed to reconnect to %s\n",
923 unit->device.bus_id);
924 /* Fall back and try to log in again. */
926 PREPARE_DELAYED_WORK(&lu->work, sbp2_login);
928 sbp2_queue_work(lu, DIV_ROUND_UP(HZ, 5));
932 lu->generation = generation;
933 lu->tgt->node_id = node_id;
934 lu->tgt->address_high = local_node_id << 16;
936 fw_notify("reconnected to %s LUN %04x (%d retries)\n",
937 unit->device.bus_id, lu->lun, lu->retries);
939 sbp2_agent_reset(lu);
940 sbp2_cancel_orbs(lu);
942 sbp2_target_put(lu->tgt);
945 static void sbp2_update(struct fw_unit *unit)
947 struct sbp2_target *tgt = unit->device.driver_data;
948 struct sbp2_logical_unit *lu;
950 fw_device_enable_phys_dma(fw_device(unit->device.parent));
953 * Fw-core serializes sbp2_update() against sbp2_remove().
954 * Iteration over tgt->lu_list is therefore safe here.
956 list_for_each_entry(lu, &tgt->lu_list, link) {
958 sbp2_queue_work(lu, 0);
962 #define SBP2_UNIT_SPEC_ID_ENTRY 0x0000609e
963 #define SBP2_SW_VERSION_ENTRY 0x00010483
965 static const struct fw_device_id sbp2_id_table[] = {
967 .match_flags = FW_MATCH_SPECIFIER_ID | FW_MATCH_VERSION,
968 .specifier_id = SBP2_UNIT_SPEC_ID_ENTRY,
969 .version = SBP2_SW_VERSION_ENTRY,
974 static struct fw_driver sbp2_driver = {
976 .owner = THIS_MODULE,
977 .name = sbp2_driver_name,
980 .remove = sbp2_remove,
982 .update = sbp2_update,
983 .id_table = sbp2_id_table,
987 sbp2_status_to_sense_data(u8 *sbp2_status, u8 *sense_data)
991 sense_data[0] = 0x70;
993 sense_data[2] = sbp2_status[1];
994 sense_data[3] = sbp2_status[4];
995 sense_data[4] = sbp2_status[5];
996 sense_data[5] = sbp2_status[6];
997 sense_data[6] = sbp2_status[7];
999 sense_data[8] = sbp2_status[8];
1000 sense_data[9] = sbp2_status[9];
1001 sense_data[10] = sbp2_status[10];
1002 sense_data[11] = sbp2_status[11];
1003 sense_data[12] = sbp2_status[2];
1004 sense_data[13] = sbp2_status[3];
1005 sense_data[14] = sbp2_status[12];
1006 sense_data[15] = sbp2_status[13];
1008 sam_status = sbp2_status[0] & 0x3f;
1010 switch (sam_status) {
1012 case SAM_STAT_CHECK_CONDITION:
1013 case SAM_STAT_CONDITION_MET:
1015 case SAM_STAT_RESERVATION_CONFLICT:
1016 case SAM_STAT_COMMAND_TERMINATED:
1017 return DID_OK << 16 | sam_status;
1020 return DID_ERROR << 16;
1025 complete_command_orb(struct sbp2_orb *base_orb, struct sbp2_status *status)
1027 struct sbp2_command_orb *orb =
1028 container_of(base_orb, struct sbp2_command_orb, base);
1029 struct fw_device *device = fw_device(orb->lu->tgt->unit->device.parent);
1032 if (status != NULL) {
1033 if (STATUS_GET_DEAD(*status))
1034 sbp2_agent_reset(orb->lu);
1036 switch (STATUS_GET_RESPONSE(*status)) {
1037 case SBP2_STATUS_REQUEST_COMPLETE:
1038 result = DID_OK << 16;
1040 case SBP2_STATUS_TRANSPORT_FAILURE:
1041 result = DID_BUS_BUSY << 16;
1043 case SBP2_STATUS_ILLEGAL_REQUEST:
1044 case SBP2_STATUS_VENDOR_DEPENDENT:
1046 result = DID_ERROR << 16;
1050 if (result == DID_OK << 16 && STATUS_GET_LEN(*status) > 1)
1051 result = sbp2_status_to_sense_data(STATUS_GET_DATA(*status),
1052 orb->cmd->sense_buffer);
1055 * If the orb completes with status == NULL, something
1056 * went wrong, typically a bus reset happened mid-orb
1057 * or when sending the write (less likely).
1059 result = DID_BUS_BUSY << 16;
1062 dma_unmap_single(device->card->device, orb->base.request_bus,
1063 sizeof(orb->request), DMA_TO_DEVICE);
1065 if (scsi_sg_count(orb->cmd) > 0)
1066 dma_unmap_sg(device->card->device, scsi_sglist(orb->cmd),
1067 scsi_sg_count(orb->cmd),
1068 orb->cmd->sc_data_direction);
1070 if (orb->page_table_bus != 0)
1071 dma_unmap_single(device->card->device, orb->page_table_bus,
1072 sizeof(orb->page_table), DMA_TO_DEVICE);
1074 orb->cmd->result = result;
1075 orb->done(orb->cmd);
1079 sbp2_map_scatterlist(struct sbp2_command_orb *orb, struct fw_device *device,
1080 struct sbp2_logical_unit *lu)
1082 struct scatterlist *sg;
1083 int sg_len, l, i, j, count;
1086 sg = scsi_sglist(orb->cmd);
1087 count = dma_map_sg(device->card->device, sg, scsi_sg_count(orb->cmd),
1088 orb->cmd->sc_data_direction);
1093 * Handle the special case where there is only one element in
1094 * the scatter list by converting it to an immediate block
1095 * request. This is also a workaround for broken devices such
1096 * as the second generation iPod which doesn't support page
1099 if (count == 1 && sg_dma_len(sg) < SBP2_MAX_SG_ELEMENT_LENGTH) {
1100 orb->request.data_descriptor.high = lu->tgt->address_high;
1101 orb->request.data_descriptor.low = sg_dma_address(sg);
1102 orb->request.misc |= COMMAND_ORB_DATA_SIZE(sg_dma_len(sg));
1107 * Convert the scatterlist to an sbp2 page table. If any
1108 * scatterlist entries are too big for sbp2, we split them as we
1109 * go. Even if we ask the block I/O layer to not give us sg
1110 * elements larger than 65535 bytes, some IOMMUs may merge sg elements
1111 * during DMA mapping, and Linux currently doesn't prevent this.
1113 for (i = 0, j = 0; i < count; i++, sg = sg_next(sg)) {
1114 sg_len = sg_dma_len(sg);
1115 sg_addr = sg_dma_address(sg);
1117 /* FIXME: This won't get us out of the pinch. */
1118 if (unlikely(j >= ARRAY_SIZE(orb->page_table))) {
1119 fw_error("page table overflow\n");
1120 goto fail_page_table;
1122 l = min(sg_len, SBP2_MAX_SG_ELEMENT_LENGTH);
1123 orb->page_table[j].low = sg_addr;
1124 orb->page_table[j].high = (l << 16);
1131 fw_memcpy_to_be32(orb->page_table, orb->page_table,
1132 sizeof(orb->page_table[0]) * j);
1133 orb->page_table_bus =
1134 dma_map_single(device->card->device, orb->page_table,
1135 sizeof(orb->page_table), DMA_TO_DEVICE);
1136 if (dma_mapping_error(orb->page_table_bus))
1137 goto fail_page_table;
1140 * The data_descriptor pointer is the one case where we need
1141 * to fill in the node ID part of the address. All other
1142 * pointers assume that the data referenced reside on the
1143 * initiator (i.e. us), but data_descriptor can refer to data
1144 * on other nodes so we need to put our ID in descriptor.high.
1146 orb->request.data_descriptor.high = lu->tgt->address_high;
1147 orb->request.data_descriptor.low = orb->page_table_bus;
1148 orb->request.misc |=
1149 COMMAND_ORB_PAGE_TABLE_PRESENT |
1150 COMMAND_ORB_DATA_SIZE(j);
1155 dma_unmap_sg(device->card->device, sg, scsi_sg_count(orb->cmd),
1156 orb->cmd->sc_data_direction);
1161 /* SCSI stack integration */
1163 static int sbp2_scsi_queuecommand(struct scsi_cmnd *cmd, scsi_done_fn_t done)
1165 struct sbp2_logical_unit *lu = cmd->device->hostdata;
1166 struct fw_device *device = fw_device(lu->tgt->unit->device.parent);
1167 struct sbp2_command_orb *orb;
1168 unsigned max_payload;
1169 int retval = SCSI_MLQUEUE_HOST_BUSY;
1172 * Bidirectional commands are not yet implemented, and unknown
1173 * transfer direction not handled.
1175 if (cmd->sc_data_direction == DMA_BIDIRECTIONAL) {
1176 fw_error("Can't handle DMA_BIDIRECTIONAL, rejecting command\n");
1177 cmd->result = DID_ERROR << 16;
1182 orb = kzalloc(sizeof(*orb), GFP_ATOMIC);
1184 fw_notify("failed to alloc orb\n");
1185 return SCSI_MLQUEUE_HOST_BUSY;
1188 /* Initialize rcode to something not RCODE_COMPLETE. */
1189 orb->base.rcode = -1;
1190 kref_init(&orb->base.kref);
1196 orb->request.next.high = SBP2_ORB_NULL;
1197 orb->request.next.low = 0x0;
1199 * At speed 100 we can do 512 bytes per packet, at speed 200,
1200 * 1024 bytes per packet etc. The SBP-2 max_payload field
1201 * specifies the max payload size as 2 ^ (max_payload + 2), so
1202 * if we set this to max_speed + 7, we get the right value.
1204 max_payload = min(device->max_speed + 7,
1205 device->card->max_receive - 1);
1207 COMMAND_ORB_MAX_PAYLOAD(max_payload) |
1208 COMMAND_ORB_SPEED(device->max_speed) |
1211 if (cmd->sc_data_direction == DMA_FROM_DEVICE)
1212 orb->request.misc |=
1213 COMMAND_ORB_DIRECTION(SBP2_DIRECTION_FROM_MEDIA);
1214 else if (cmd->sc_data_direction == DMA_TO_DEVICE)
1215 orb->request.misc |=
1216 COMMAND_ORB_DIRECTION(SBP2_DIRECTION_TO_MEDIA);
1218 if (scsi_sg_count(cmd) && sbp2_map_scatterlist(orb, device, lu) < 0)
1221 fw_memcpy_to_be32(&orb->request, &orb->request, sizeof(orb->request));
1223 memset(orb->request.command_block,
1224 0, sizeof(orb->request.command_block));
1225 memcpy(orb->request.command_block, cmd->cmnd, COMMAND_SIZE(*cmd->cmnd));
1227 orb->base.callback = complete_command_orb;
1228 orb->base.request_bus =
1229 dma_map_single(device->card->device, &orb->request,
1230 sizeof(orb->request), DMA_TO_DEVICE);
1231 if (dma_mapping_error(orb->base.request_bus))
1234 sbp2_send_orb(&orb->base, lu, lu->tgt->node_id, lu->generation,
1235 lu->command_block_agent_address + SBP2_ORB_POINTER);
1238 kref_put(&orb->base.kref, free_orb);
1242 static int sbp2_scsi_slave_alloc(struct scsi_device *sdev)
1244 struct sbp2_logical_unit *lu = sdev->hostdata;
1246 sdev->allow_restart = 1;
1249 * Update the dma alignment (minimum alignment requirements for
1250 * start and end of DMA transfers) to be a sector
1252 blk_queue_update_dma_alignment(sdev->request_queue, 511);
1254 if (lu->tgt->workarounds & SBP2_WORKAROUND_INQUIRY_36)
1255 sdev->inquiry_len = 36;
1260 static int sbp2_scsi_slave_configure(struct scsi_device *sdev)
1262 struct sbp2_logical_unit *lu = sdev->hostdata;
1264 sdev->use_10_for_rw = 1;
1266 if (sdev->type == TYPE_ROM)
1267 sdev->use_10_for_ms = 1;
1269 if (sdev->type == TYPE_DISK &&
1270 lu->tgt->workarounds & SBP2_WORKAROUND_MODE_SENSE_8)
1271 sdev->skip_ms_page_8 = 1;
1273 if (lu->tgt->workarounds & SBP2_WORKAROUND_FIX_CAPACITY)
1274 sdev->fix_capacity = 1;
1276 if (lu->tgt->workarounds & SBP2_WORKAROUND_128K_MAX_TRANS)
1277 blk_queue_max_sectors(sdev->request_queue, 128 * 1024 / 512);
1283 * Called by scsi stack when something has really gone wrong. Usually
1284 * called when a command has timed-out for some reason.
1286 static int sbp2_scsi_abort(struct scsi_cmnd *cmd)
1288 struct sbp2_logical_unit *lu = cmd->device->hostdata;
1290 fw_notify("sbp2_scsi_abort\n");
1291 sbp2_agent_reset(lu);
1292 sbp2_cancel_orbs(lu);
1298 * Format of /sys/bus/scsi/devices/.../ieee1394_id:
1299 * u64 EUI-64 : u24 directory_ID : u16 LUN (all printed in hexadecimal)
1301 * This is the concatenation of target port identifier and logical unit
1302 * identifier as per SAM-2...SAM-4 annex A.
1305 sbp2_sysfs_ieee1394_id_show(struct device *dev, struct device_attribute *attr,
1308 struct scsi_device *sdev = to_scsi_device(dev);
1309 struct sbp2_logical_unit *lu;
1310 struct fw_device *device;
1315 lu = sdev->hostdata;
1316 device = fw_device(lu->tgt->unit->device.parent);
1318 return sprintf(buf, "%08x%08x:%06x:%04x\n",
1319 device->config_rom[3], device->config_rom[4],
1320 lu->tgt->directory_id, lu->lun);
1323 static DEVICE_ATTR(ieee1394_id, S_IRUGO, sbp2_sysfs_ieee1394_id_show, NULL);
1325 static struct device_attribute *sbp2_scsi_sysfs_attrs[] = {
1326 &dev_attr_ieee1394_id,
1330 static struct scsi_host_template scsi_driver_template = {
1331 .module = THIS_MODULE,
1332 .name = "SBP-2 IEEE-1394",
1333 .proc_name = sbp2_driver_name,
1334 .queuecommand = sbp2_scsi_queuecommand,
1335 .slave_alloc = sbp2_scsi_slave_alloc,
1336 .slave_configure = sbp2_scsi_slave_configure,
1337 .eh_abort_handler = sbp2_scsi_abort,
1339 .sg_tablesize = SG_ALL,
1340 .use_clustering = ENABLE_CLUSTERING,
1343 .sdev_attrs = sbp2_scsi_sysfs_attrs,
1346 MODULE_AUTHOR("Kristian Hoegsberg <krh@bitplanet.net>");
1347 MODULE_DESCRIPTION("SCSI over IEEE1394");
1348 MODULE_LICENSE("GPL");
1349 MODULE_DEVICE_TABLE(ieee1394, sbp2_id_table);
1351 /* Provide a module alias so root-on-sbp2 initrds don't break. */
1352 #ifndef CONFIG_IEEE1394_SBP2_MODULE
1353 MODULE_ALIAS("sbp2");
1356 static int __init sbp2_init(void)
1358 sbp2_wq = create_singlethread_workqueue(KBUILD_MODNAME);
1362 return driver_register(&sbp2_driver.driver);
1365 static void __exit sbp2_cleanup(void)
1367 driver_unregister(&sbp2_driver.driver);
1368 destroy_workqueue(sbp2_wq);
1371 module_init(sbp2_init);
1372 module_exit(sbp2_cleanup);