1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Driver for Future Domain TMC-16x0 and TMC-3260 SCSI host adapters
4 * Copyright 2019 Ondrej Zary
5 *
6 * Original driver by
7 * Rickard E. Faith, faith@cs.unc.edu
8 *
9 * Future Domain BIOS versions supported for autodetect:
10 * 2.0, 3.0, 3.2, 3.4 (1.0), 3.5 (2.0), 3.6, 3.61
11 * Chips supported:
12 * TMC-1800, TMC-18C50, TMC-18C30, TMC-36C70
13 * Boards supported:
14 * Future Domain TMC-1650, TMC-1660, TMC-1670, TMC-1680, TMC-1610M/MER/MEX
15 * Future Domain TMC-3260 (PCI)
16 * Quantum ISA-200S, ISA-250MG
17 * Adaptec AHA-2920A (PCI) [BUT *NOT* AHA-2920C -- use aic7xxx instead]
18 * IBM ?
19 *
20 * NOTE:
21 *
22 * The Adaptec AHA-2920C has an Adaptec AIC-7850 chip on it.
23 * Use the aic7xxx driver for this board.
24 *
25 * The Adaptec AHA-2920A has a Future Domain chip on it, so this is the right
26 * driver for that card. Unfortunately, the boxes will probably just say
27 * "2920", so you'll have to look on the card for a Future Domain logo, or a
28 * letter after the 2920.
29 *
30 * If you have a TMC-8xx or TMC-9xx board, then this is not the driver for
31 * your board.
32 *
33 * DESCRIPTION:
34 *
35 * This is the Linux low-level SCSI driver for Future Domain TMC-1660/1680
36 * TMC-1650/1670, and TMC-3260 SCSI host adapters. The 1650 and 1670 have a
37 * 25-pin external connector, whereas the 1660 and 1680 have a SCSI-2 50-pin
38 * high-density external connector. The 1670 and 1680 have floppy disk
39 * controllers built in. The TMC-3260 is a PCI bus card.
40 *
41 * Future Domain's older boards are based on the TMC-1800 chip, and this
42 * driver was originally written for a TMC-1680 board with the TMC-1800 chip.
43 * More recently, boards are being produced with the TMC-18C50 and TMC-18C30
44 * chips.
45 *
46 * Please note that the drive ordering that Future Domain implemented in BIOS
47 * versions 3.4 and 3.5 is the opposite of the order (currently) used by the
48 * rest of the SCSI industry.
49 *
50 *
51 * REFERENCES USED:
52 *
53 * "TMC-1800 SCSI Chip Specification (FDC-1800T)", Future Domain Corporation,
54 * 1990.
55 *
56 * "Technical Reference Manual: 18C50 SCSI Host Adapter Chip", Future Domain
57 * Corporation, January 1992.
58 *
59 * "LXT SCSI Products: Specifications and OEM Technical Manual (Revision
60 * B/September 1991)", Maxtor Corporation, 1991.
61 *
62 * "7213S product Manual (Revision P3)", Maxtor Corporation, 1992.
63 *
64 * "Draft Proposed American National Standard: Small Computer System
65 * Interface - 2 (SCSI-2)", Global Engineering Documents. (X3T9.2/86-109,
66 * revision 10h, October 17, 1991)
67 *
68 * Private communications, Drew Eckhardt (drew@cs.colorado.edu) and Eric
69 * Youngdale (ericy@cais.com), 1992.
70 *
71 * Private communication, Tuong Le (Future Domain Engineering department),
72 * 1994. (Disk geometry computations for Future Domain BIOS version 3.4, and
73 * TMC-18C30 detection.)
74 *
75 * Hogan, Thom. The Programmer's PC Sourcebook. Microsoft Press, 1988. Page
76 * 60 (2.39: Disk Partition Table Layout).
77 *
78 * "18C30 Technical Reference Manual", Future Domain Corporation, 1993, page
79 * 6-1.
80 */
81
82#include <linux/module.h>
83#include <linux/interrupt.h>
84#include <linux/delay.h>
85#include <linux/pci.h>
86#include <linux/workqueue.h>
87#include <scsi/scsicam.h>
88#include <scsi/scsi_cmnd.h>
89#include <scsi/scsi_device.h>
90#include <scsi/scsi_host.h>
91#include "fdomain.h"
92
93/*
94 * FIFO_COUNT: The host adapter has an 8K cache (host adapters based on the
95 * 18C30 chip have a 2k cache). When this many 512 byte blocks are filled by
96 * the SCSI device, an interrupt will be raised. Therefore, this could be as
97 * low as 0, or as high as 16. Note, however, that values which are too high
98 * or too low seem to prevent any interrupts from occurring, and thereby lock
99 * up the machine.
100 */
101#define FIFO_COUNT 2 /* Number of 512 byte blocks before INTR */
102#define PARITY_MASK ACTL_PAREN /* Parity enabled, 0 = disabled */
103
104enum chip_type {
105 unknown = 0x00,
106 tmc1800 = 0x01,
107 tmc18c50 = 0x02,
108 tmc18c30 = 0x03,
109};
110
111struct fdomain {
112 int base;
113 struct scsi_cmnd *cur_cmd;
114 enum chip_type chip;
115 struct work_struct work;
116};
117
118static struct scsi_pointer *fdomain_scsi_pointer(struct scsi_cmnd *cmd)
119{
120 return scsi_cmd_priv(cmd);
121}
122
123static inline void fdomain_make_bus_idle(struct fdomain *fd)
124{
125 outb(value: 0, port: fd->base + REG_BCTL);
126 outb(value: 0, port: fd->base + REG_MCTL);
127 if (fd->chip == tmc18c50 || fd->chip == tmc18c30)
128 /* Clear forced intr. */
129 outb(ACTL_RESET | ACTL_CLRFIRQ | PARITY_MASK,
130 port: fd->base + REG_ACTL);
131 else
132 outb(ACTL_RESET | PARITY_MASK, port: fd->base + REG_ACTL);
133}
134
135static enum chip_type fdomain_identify(int port)
136{
137 u16 id = inb(port: port + REG_ID_LSB) | inb(port: port + REG_ID_MSB) << 8;
138
139 switch (id) {
140 case 0x6127:
141 return tmc1800;
142 case 0x60e9: /* 18c50 or 18c30 */
143 break;
144 default:
145 return unknown;
146 }
147
148 /* Try to toggle 32-bit mode. This only works on an 18c30 chip. */
149 outb(CFG2_32BIT, port: port + REG_CFG2);
150 if ((inb(port: port + REG_CFG2) & CFG2_32BIT)) {
151 outb(value: 0, port: port + REG_CFG2);
152 if ((inb(port: port + REG_CFG2) & CFG2_32BIT) == 0)
153 return tmc18c30;
154 }
155 /* If that failed, we are an 18c50. */
156 return tmc18c50;
157}
158
159static int fdomain_test_loopback(int base)
160{
161 int i;
162
163 for (i = 0; i < 255; i++) {
164 outb(value: i, port: base + REG_LOOPBACK);
165 if (inb(port: base + REG_LOOPBACK) != i)
166 return 1;
167 }
168
169 return 0;
170}
171
172static void fdomain_reset(int base)
173{
174 outb(BCTL_RST, port: base + REG_BCTL);
175 mdelay(20);
176 outb(value: 0, port: base + REG_BCTL);
177 mdelay(1150);
178 outb(value: 0, port: base + REG_MCTL);
179 outb(PARITY_MASK, port: base + REG_ACTL);
180}
181
182static int fdomain_select(struct Scsi_Host *sh, int target)
183{
184 int status;
185 unsigned long timeout;
186 struct fdomain *fd = shost_priv(shost: sh);
187
188 outb(BCTL_BUSEN | BCTL_SEL, port: fd->base + REG_BCTL);
189 outb(BIT(sh->this_id) | BIT(target), port: fd->base + REG_SCSI_DATA_NOACK);
190
191 /* Stop arbitration and enable parity */
192 outb(PARITY_MASK, port: fd->base + REG_ACTL);
193
194 timeout = 350; /* 350 msec */
195
196 do {
197 status = inb(port: fd->base + REG_BSTAT);
198 if (status & BSTAT_BSY) {
199 /* Enable SCSI Bus */
200 /* (on error, should make bus idle with 0) */
201 outb(BCTL_BUSEN, port: fd->base + REG_BCTL);
202 return 0;
203 }
204 mdelay(1);
205 } while (--timeout);
206 fdomain_make_bus_idle(fd);
207 return 1;
208}
209
210static void fdomain_finish_cmd(struct fdomain *fd)
211{
212 outb(value: 0, port: fd->base + REG_ICTL);
213 fdomain_make_bus_idle(fd);
214 scsi_done(cmd: fd->cur_cmd);
215 fd->cur_cmd = NULL;
216}
217
218static void fdomain_read_data(struct scsi_cmnd *cmd)
219{
220 struct fdomain *fd = shost_priv(shost: cmd->device->host);
221 unsigned char *virt, *ptr;
222 size_t offset, len;
223
224 while ((len = inw(port: fd->base + REG_FIFO_COUNT)) > 0) {
225 offset = scsi_bufflen(cmd) - scsi_get_resid(cmd);
226 virt = scsi_kmap_atomic_sg(sg: scsi_sglist(cmd), sg_count: scsi_sg_count(cmd),
227 offset: &offset, len: &len);
228 ptr = virt + offset;
229 if (len & 1)
230 *ptr++ = inb(port: fd->base + REG_FIFO);
231 if (len > 1)
232 insw(port: fd->base + REG_FIFO, addr: ptr, count: len >> 1);
233 scsi_set_resid(cmd, resid: scsi_get_resid(cmd) - len);
234 scsi_kunmap_atomic_sg(virt);
235 }
236}
237
238static void fdomain_write_data(struct scsi_cmnd *cmd)
239{
240 struct fdomain *fd = shost_priv(shost: cmd->device->host);
241 /* 8k FIFO for pre-tmc18c30 chips, 2k FIFO for tmc18c30 */
242 int FIFO_Size = fd->chip == tmc18c30 ? 0x800 : 0x2000;
243 unsigned char *virt, *ptr;
244 size_t offset, len;
245
246 while ((len = FIFO_Size - inw(port: fd->base + REG_FIFO_COUNT)) > 512) {
247 offset = scsi_bufflen(cmd) - scsi_get_resid(cmd);
248 if (len + offset > scsi_bufflen(cmd)) {
249 len = scsi_bufflen(cmd) - offset;
250 if (len == 0)
251 break;
252 }
253 virt = scsi_kmap_atomic_sg(sg: scsi_sglist(cmd), sg_count: scsi_sg_count(cmd),
254 offset: &offset, len: &len);
255 ptr = virt + offset;
256 if (len & 1)
257 outb(value: *ptr++, port: fd->base + REG_FIFO);
258 if (len > 1)
259 outsw(port: fd->base + REG_FIFO, addr: ptr, count: len >> 1);
260 scsi_set_resid(cmd, resid: scsi_get_resid(cmd) - len);
261 scsi_kunmap_atomic_sg(virt);
262 }
263}
264
265static void fdomain_work(struct work_struct *work)
266{
267 struct fdomain *fd = container_of(work, struct fdomain, work);
268 struct Scsi_Host *sh = container_of((void *)fd, struct Scsi_Host,
269 hostdata);
270 struct scsi_cmnd *cmd = fd->cur_cmd;
271 struct scsi_pointer *scsi_pointer = fdomain_scsi_pointer(cmd);
272 unsigned long flags;
273 int status;
274 int done = 0;
275
276 spin_lock_irqsave(sh->host_lock, flags);
277
278 if (scsi_pointer->phase & in_arbitration) {
279 status = inb(port: fd->base + REG_ASTAT);
280 if (!(status & ASTAT_ARB)) {
281 set_host_byte(cmd, status: DID_BUS_BUSY);
282 fdomain_finish_cmd(fd);
283 goto out;
284 }
285 scsi_pointer->phase = in_selection;
286
287 outb(ICTL_SEL | FIFO_COUNT, port: fd->base + REG_ICTL);
288 outb(BCTL_BUSEN | BCTL_SEL, port: fd->base + REG_BCTL);
289 outb(BIT(cmd->device->host->this_id) | BIT(scmd_id(cmd)),
290 port: fd->base + REG_SCSI_DATA_NOACK);
291 /* Stop arbitration and enable parity */
292 outb(ACTL_IRQEN | PARITY_MASK, port: fd->base + REG_ACTL);
293 goto out;
294 } else if (scsi_pointer->phase & in_selection) {
295 status = inb(port: fd->base + REG_BSTAT);
296 if (!(status & BSTAT_BSY)) {
297 /* Try again, for slow devices */
298 if (fdomain_select(sh: cmd->device->host, scmd_id(cmd))) {
299 set_host_byte(cmd, status: DID_NO_CONNECT);
300 fdomain_finish_cmd(fd);
301 goto out;
302 }
303 /* Stop arbitration and enable parity */
304 outb(ACTL_IRQEN | PARITY_MASK, port: fd->base + REG_ACTL);
305 }
306 scsi_pointer->phase = in_other;
307 outb(ICTL_FIFO | ICTL_REQ | FIFO_COUNT, port: fd->base + REG_ICTL);
308 outb(BCTL_BUSEN, port: fd->base + REG_BCTL);
309 goto out;
310 }
311
312 /* fdomain_scsi_pointer(cur_cmd)->phase == in_other: this is the body of the routine */
313 status = inb(port: fd->base + REG_BSTAT);
314
315 if (status & BSTAT_REQ) {
316 switch (status & (BSTAT_MSG | BSTAT_CMD | BSTAT_IO)) {
317 case BSTAT_CMD: /* COMMAND OUT */
318 outb(value: cmd->cmnd[scsi_pointer->sent_command++],
319 port: fd->base + REG_SCSI_DATA);
320 break;
321 case 0: /* DATA OUT -- tmc18c50/tmc18c30 only */
322 if (fd->chip != tmc1800 && !scsi_pointer->have_data_in) {
323 scsi_pointer->have_data_in = -1;
324 outb(ACTL_IRQEN | ACTL_FIFOWR | ACTL_FIFOEN |
325 PARITY_MASK, port: fd->base + REG_ACTL);
326 }
327 break;
328 case BSTAT_IO: /* DATA IN -- tmc18c50/tmc18c30 only */
329 if (fd->chip != tmc1800 && !scsi_pointer->have_data_in) {
330 scsi_pointer->have_data_in = 1;
331 outb(ACTL_IRQEN | ACTL_FIFOEN | PARITY_MASK,
332 port: fd->base + REG_ACTL);
333 }
334 break;
335 case BSTAT_CMD | BSTAT_IO: /* STATUS IN */
336 scsi_pointer->Status = inb(port: fd->base + REG_SCSI_DATA);
337 break;
338 case BSTAT_MSG | BSTAT_CMD: /* MESSAGE OUT */
339 outb(value: MESSAGE_REJECT, port: fd->base + REG_SCSI_DATA);
340 break;
341 case BSTAT_MSG | BSTAT_CMD | BSTAT_IO: /* MESSAGE IN */
342 scsi_pointer->Message = inb(port: fd->base + REG_SCSI_DATA);
343 if (scsi_pointer->Message == COMMAND_COMPLETE)
344 ++done;
345 break;
346 }
347 }
348
349 if (fd->chip == tmc1800 && !scsi_pointer->have_data_in &&
350 scsi_pointer->sent_command >= cmd->cmd_len) {
351 if (cmd->sc_data_direction == DMA_TO_DEVICE) {
352 scsi_pointer->have_data_in = -1;
353 outb(ACTL_IRQEN | ACTL_FIFOWR | ACTL_FIFOEN |
354 PARITY_MASK, port: fd->base + REG_ACTL);
355 } else {
356 scsi_pointer->have_data_in = 1;
357 outb(ACTL_IRQEN | ACTL_FIFOEN | PARITY_MASK,
358 port: fd->base + REG_ACTL);
359 }
360 }
361
362 if (scsi_pointer->have_data_in == -1) /* DATA OUT */
363 fdomain_write_data(cmd);
364
365 if (scsi_pointer->have_data_in == 1) /* DATA IN */
366 fdomain_read_data(cmd);
367
368 if (done) {
369 set_status_byte(cmd, status: scsi_pointer->Status);
370 set_host_byte(cmd, status: DID_OK);
371 scsi_msg_to_host_byte(cmd, msg: scsi_pointer->Message);
372 fdomain_finish_cmd(fd);
373 } else {
374 if (scsi_pointer->phase & disconnect) {
375 outb(ICTL_FIFO | ICTL_SEL | ICTL_REQ | FIFO_COUNT,
376 port: fd->base + REG_ICTL);
377 outb(value: 0, port: fd->base + REG_BCTL);
378 } else
379 outb(ICTL_FIFO | ICTL_REQ | FIFO_COUNT,
380 port: fd->base + REG_ICTL);
381 }
382out:
383 spin_unlock_irqrestore(lock: sh->host_lock, flags);
384}
385
386static irqreturn_t fdomain_irq(int irq, void *dev_id)
387{
388 struct fdomain *fd = dev_id;
389
390 /* Is it our IRQ? */
391 if ((inb(port: fd->base + REG_ASTAT) & ASTAT_IRQ) == 0)
392 return IRQ_NONE;
393
394 outb(value: 0, port: fd->base + REG_ICTL);
395
396 /* We usually have one spurious interrupt after each command. */
397 if (!fd->cur_cmd) /* Spurious interrupt */
398 return IRQ_NONE;
399
400 schedule_work(work: &fd->work);
401
402 return IRQ_HANDLED;
403}
404
405static int fdomain_queue(struct Scsi_Host *sh, struct scsi_cmnd *cmd)
406{
407 struct scsi_pointer *scsi_pointer = fdomain_scsi_pointer(cmd);
408 struct fdomain *fd = shost_priv(shost: cmd->device->host);
409 unsigned long flags;
410
411 scsi_pointer->Status = 0;
412 scsi_pointer->Message = 0;
413 scsi_pointer->have_data_in = 0;
414 scsi_pointer->sent_command = 0;
415 scsi_pointer->phase = in_arbitration;
416 scsi_set_resid(cmd, resid: scsi_bufflen(cmd));
417
418 spin_lock_irqsave(sh->host_lock, flags);
419
420 fd->cur_cmd = cmd;
421
422 fdomain_make_bus_idle(fd);
423
424 /* Start arbitration */
425 outb(value: 0, port: fd->base + REG_ICTL);
426 outb(value: 0, port: fd->base + REG_BCTL); /* Disable data drivers */
427 /* Set our id bit */
428 outb(BIT(cmd->device->host->this_id), port: fd->base + REG_SCSI_DATA_NOACK);
429 outb(ICTL_ARB, port: fd->base + REG_ICTL);
430 /* Start arbitration */
431 outb(ACTL_ARB | ACTL_IRQEN | PARITY_MASK, port: fd->base + REG_ACTL);
432
433 spin_unlock_irqrestore(lock: sh->host_lock, flags);
434
435 return 0;
436}
437
438static int fdomain_abort(struct scsi_cmnd *cmd)
439{
440 struct Scsi_Host *sh = cmd->device->host;
441 struct fdomain *fd = shost_priv(shost: sh);
442 unsigned long flags;
443
444 if (!fd->cur_cmd)
445 return FAILED;
446
447 spin_lock_irqsave(sh->host_lock, flags);
448
449 fdomain_make_bus_idle(fd);
450 fdomain_scsi_pointer(cmd: fd->cur_cmd)->phase |= aborted;
451
452 /* Aborts are not done well. . . */
453 set_host_byte(cmd: fd->cur_cmd, status: DID_ABORT);
454 fdomain_finish_cmd(fd);
455 spin_unlock_irqrestore(lock: sh->host_lock, flags);
456 return SUCCESS;
457}
458
459static int fdomain_host_reset(struct scsi_cmnd *cmd)
460{
461 struct Scsi_Host *sh = cmd->device->host;
462 struct fdomain *fd = shost_priv(shost: sh);
463 unsigned long flags;
464
465 spin_lock_irqsave(sh->host_lock, flags);
466 fdomain_reset(base: fd->base);
467 spin_unlock_irqrestore(lock: sh->host_lock, flags);
468 return SUCCESS;
469}
470
471static int fdomain_biosparam(struct scsi_device *sdev,
472 struct gendisk *disk, sector_t capacity,
473 int geom[])
474{
475 unsigned char *p = scsi_bios_ptable(disk);
476
477 if (p && p[65] == 0xaa && p[64] == 0x55 /* Partition table valid */
478 && p[4]) { /* Partition type */
479 geom[0] = p[5] + 1; /* heads */
480 geom[1] = p[6] & 0x3f; /* sectors */
481 } else {
482 if (capacity >= 0x7e0000) {
483 geom[0] = 255; /* heads */
484 geom[1] = 63; /* sectors */
485 } else if (capacity >= 0x200000) {
486 geom[0] = 128; /* heads */
487 geom[1] = 63; /* sectors */
488 } else {
489 geom[0] = 64; /* heads */
490 geom[1] = 32; /* sectors */
491 }
492 }
493 geom[2] = sector_div(capacity, geom[0] * geom[1]);
494 kfree(objp: p);
495
496 return 0;
497}
498
499static const struct scsi_host_template fdomain_template = {
500 .module = THIS_MODULE,
501 .name = "Future Domain TMC-16x0",
502 .proc_name = "fdomain",
503 .queuecommand = fdomain_queue,
504 .eh_abort_handler = fdomain_abort,
505 .eh_host_reset_handler = fdomain_host_reset,
506 .bios_param = fdomain_biosparam,
507 .can_queue = 1,
508 .this_id = 7,
509 .sg_tablesize = 64,
510 .dma_boundary = PAGE_SIZE - 1,
511 .cmd_size = sizeof(struct scsi_pointer),
512};
513
514struct Scsi_Host *fdomain_create(int base, int irq, int this_id,
515 struct device *dev)
516{
517 struct Scsi_Host *sh;
518 struct fdomain *fd;
519 enum chip_type chip;
520 static const char * const chip_names[] = {
521 "Unknown", "TMC-1800", "TMC-18C50", "TMC-18C30"
522 };
523 unsigned long irq_flags = 0;
524
525 chip = fdomain_identify(port: base);
526 if (!chip)
527 return NULL;
528
529 fdomain_reset(base);
530
531 if (fdomain_test_loopback(base))
532 return NULL;
533
534 if (!irq) {
535 dev_err(dev, "card has no IRQ assigned");
536 return NULL;
537 }
538
539 sh = scsi_host_alloc(&fdomain_template, sizeof(struct fdomain));
540 if (!sh)
541 return NULL;
542
543 if (this_id)
544 sh->this_id = this_id & 0x07;
545
546 sh->irq = irq;
547 sh->io_port = base;
548 sh->n_io_port = FDOMAIN_REGION_SIZE;
549
550 fd = shost_priv(shost: sh);
551 fd->base = base;
552 fd->chip = chip;
553 INIT_WORK(&fd->work, fdomain_work);
554
555 if (dev_is_pci(dev) || !strcmp(dev->bus->name, "pcmcia"))
556 irq_flags = IRQF_SHARED;
557
558 if (request_irq(irq, handler: fdomain_irq, flags: irq_flags, name: "fdomain", dev: fd))
559 goto fail_put;
560
561 shost_printk(KERN_INFO, sh, "%s chip at 0x%x irq %d SCSI ID %d\n",
562 dev_is_pci(dev) ? "TMC-36C70 (PCI bus)" : chip_names[chip],
563 base, irq, sh->this_id);
564
565 if (scsi_add_host(host: sh, dev))
566 goto fail_free_irq;
567
568 scsi_scan_host(sh);
569
570 return sh;
571
572fail_free_irq:
573 free_irq(irq, fd);
574fail_put:
575 scsi_host_put(t: sh);
576 return NULL;
577}
578EXPORT_SYMBOL_GPL(fdomain_create);
579
580int fdomain_destroy(struct Scsi_Host *sh)
581{
582 struct fdomain *fd = shost_priv(shost: sh);
583
584 cancel_work_sync(work: &fd->work);
585 scsi_remove_host(sh);
586 if (sh->irq)
587 free_irq(sh->irq, fd);
588 scsi_host_put(t: sh);
589 return 0;
590}
591EXPORT_SYMBOL_GPL(fdomain_destroy);
592
593#ifdef CONFIG_PM_SLEEP
594static int fdomain_resume(struct device *dev)
595{
596 struct fdomain *fd = shost_priv(shost: dev_get_drvdata(dev));
597
598 fdomain_reset(base: fd->base);
599 return 0;
600}
601
602static SIMPLE_DEV_PM_OPS(fdomain_pm_ops, NULL, fdomain_resume);
603#endif /* CONFIG_PM_SLEEP */
604
605MODULE_AUTHOR("Ondrej Zary, Rickard E. Faith");
606MODULE_DESCRIPTION("Future Domain TMC-16x0/TMC-3260 SCSI driver");
607MODULE_LICENSE("GPL");
608

source code of linux/drivers/scsi/fdomain.c