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1// SPDX-License-Identifier: GPL-2.0-only
2/* imm.c -- low level driver for the IOMEGA MatchMaker
3 * parallel port SCSI host adapter.
4 *
5 * (The IMM is the embedded controller in the ZIP Plus drive.)
6 *
7 * My unofficial company acronym list is 21 pages long:
8 * FLA: Four letter acronym with built in facility for
9 * future expansion to five letters.
10 */
11
12#include <linux/init.h>
13#include <linux/kernel.h>
14#include <linux/module.h>
15#include <linux/blkdev.h>
16#include <linux/parport.h>
17#include <linux/workqueue.h>
18#include <linux/delay.h>
19#include <linux/slab.h>
20#include <asm/io.h>
21
22#include <scsi/scsi.h>
23#include <scsi/scsi_cmnd.h>
24#include <scsi/scsi_device.h>
25#include <scsi/scsi_host.h>
26
27/* The following #define is to avoid a clash with hosts.c */
28#define IMM_PROBE_SPP 0x0001
29#define IMM_PROBE_PS2 0x0002
30#define IMM_PROBE_ECR 0x0010
31#define IMM_PROBE_EPP17 0x0100
32#define IMM_PROBE_EPP19 0x0200
33
34
35typedef struct {
36 struct pardevice *dev; /* Parport device entry */
37 int base; /* Actual port address */
38 int base_hi; /* Hi Base address for ECP-ISA chipset */
39 int mode; /* Transfer mode */
40 struct scsi_cmnd *cur_cmd; /* Current queued command */
41 struct delayed_work imm_tq; /* Polling interrupt stuff */
42 unsigned long jstart; /* Jiffies at start */
43 unsigned failed:1; /* Failure flag */
44 unsigned dp:1; /* Data phase present */
45 unsigned rd:1; /* Read data in data phase */
46 unsigned wanted:1; /* Parport sharing busy flag */
47 unsigned int dev_no; /* Device number */
48 wait_queue_head_t *waiting;
49 struct Scsi_Host *host;
50 struct list_head list;
51} imm_struct;
52
53static void imm_reset_pulse(unsigned int base);
54static int device_check(imm_struct *dev);
55
56#include "imm.h"
57
58static inline imm_struct *imm_dev(struct Scsi_Host *host)
59{
60 return *(imm_struct **)&host->hostdata;
61}
62
63static DEFINE_SPINLOCK(arbitration_lock);
64
65static void got_it(imm_struct *dev)
66{
67 dev->base = dev->dev->port->base;
68 if (dev->cur_cmd)
69 dev->cur_cmd->SCp.phase = 1;
70 else
71 wake_up(dev->waiting);
72}
73
74static void imm_wakeup(void *ref)
75{
76 imm_struct *dev = (imm_struct *) ref;
77 unsigned long flags;
78
79 spin_lock_irqsave(&arbitration_lock, flags);
80 if (dev->wanted) {
81 if (parport_claim(dev->dev) == 0) {
82 got_it(dev);
83 dev->wanted = 0;
84 }
85 }
86 spin_unlock_irqrestore(&arbitration_lock, flags);
87}
88
89static int imm_pb_claim(imm_struct *dev)
90{
91 unsigned long flags;
92 int res = 1;
93 spin_lock_irqsave(&arbitration_lock, flags);
94 if (parport_claim(dev->dev) == 0) {
95 got_it(dev);
96 res = 0;
97 }
98 dev->wanted = res;
99 spin_unlock_irqrestore(&arbitration_lock, flags);
100 return res;
101}
102
103static void imm_pb_dismiss(imm_struct *dev)
104{
105 unsigned long flags;
106 int wanted;
107 spin_lock_irqsave(&arbitration_lock, flags);
108 wanted = dev->wanted;
109 dev->wanted = 0;
110 spin_unlock_irqrestore(&arbitration_lock, flags);
111 if (!wanted)
112 parport_release(dev->dev);
113}
114
115static inline void imm_pb_release(imm_struct *dev)
116{
117 parport_release(dev->dev);
118}
119
120/* This is to give the imm driver a way to modify the timings (and other
121 * parameters) by writing to the /proc/scsi/imm/0 file.
122 * Very simple method really... (Too simple, no error checking :( )
123 * Reason: Kernel hackers HATE having to unload and reload modules for
124 * testing...
125 * Also gives a method to use a script to obtain optimum timings (TODO)
126 */
127static int imm_write_info(struct Scsi_Host *host, char *buffer, int length)
128{
129 imm_struct *dev = imm_dev(host);
130
131 if ((length > 5) && (strncmp(buffer, "mode=", 5) == 0)) {
132 dev->mode = simple_strtoul(buffer + 5, NULL, 0);
133 return length;
134 }
135 printk("imm /proc: invalid variable\n");
136 return -EINVAL;
137}
138
139static int imm_show_info(struct seq_file *m, struct Scsi_Host *host)
140{
141 imm_struct *dev = imm_dev(host);
142
143 seq_printf(m, "Version : %s\n", IMM_VERSION);
144 seq_printf(m, "Parport : %s\n", dev->dev->port->name);
145 seq_printf(m, "Mode : %s\n", IMM_MODE_STRING[dev->mode]);
146 return 0;
147}
148
149#if IMM_DEBUG > 0
150#define imm_fail(x,y) printk("imm: imm_fail(%i) from %s at line %d\n",\
151 y, __func__, __LINE__); imm_fail_func(x,y);
152static inline void
153imm_fail_func(imm_struct *dev, int error_code)
154#else
155static inline void
156imm_fail(imm_struct *dev, int error_code)
157#endif
158{
159 /* If we fail a device then we trash status / message bytes */
160 if (dev->cur_cmd) {
161 dev->cur_cmd->result = error_code << 16;
162 dev->failed = 1;
163 }
164}
165
166/*
167 * Wait for the high bit to be set.
168 *
169 * In principle, this could be tied to an interrupt, but the adapter
170 * doesn't appear to be designed to support interrupts. We spin on
171 * the 0x80 ready bit.
172 */
173static unsigned char imm_wait(imm_struct *dev)
174{
175 int k;
176 unsigned short ppb = dev->base;
177 unsigned char r;
178
179 w_ctr(ppb, 0x0c);
180
181 k = IMM_SPIN_TMO;
182 do {
183 r = r_str(ppb);
184 k--;
185 udelay(1);
186 }
187 while (!(r & 0x80) && (k));
188
189 /*
190 * STR register (LPT base+1) to SCSI mapping:
191 *
192 * STR imm imm
193 * ===================================
194 * 0x80 S_REQ S_REQ
195 * 0x40 !S_BSY (????)
196 * 0x20 !S_CD !S_CD
197 * 0x10 !S_IO !S_IO
198 * 0x08 (????) !S_BSY
199 *
200 * imm imm meaning
201 * ==================================
202 * 0xf0 0xb8 Bit mask
203 * 0xc0 0x88 ZIP wants more data
204 * 0xd0 0x98 ZIP wants to send more data
205 * 0xe0 0xa8 ZIP is expecting SCSI command data
206 * 0xf0 0xb8 end of transfer, ZIP is sending status
207 */
208 w_ctr(ppb, 0x04);
209 if (k)
210 return (r & 0xb8);
211
212 /* Counter expired - Time out occurred */
213 imm_fail(dev, DID_TIME_OUT);
214 printk("imm timeout in imm_wait\n");
215 return 0; /* command timed out */
216}
217
218static int imm_negotiate(imm_struct * tmp)
219{
220 /*
221 * The following is supposedly the IEEE 1284-1994 negotiate
222 * sequence. I have yet to obtain a copy of the above standard
223 * so this is a bit of a guess...
224 *
225 * A fair chunk of this is based on the Linux parport implementation
226 * of IEEE 1284.
227 *
228 * Return 0 if data available
229 * 1 if no data available
230 */
231
232 unsigned short base = tmp->base;
233 unsigned char a, mode;
234
235 switch (tmp->mode) {
236 case IMM_NIBBLE:
237 mode = 0x00;
238 break;
239 case IMM_PS2:
240 mode = 0x01;
241 break;
242 default:
243 return 0;
244 }
245
246 w_ctr(base, 0x04);
247 udelay(5);
248 w_dtr(base, mode);
249 udelay(100);
250 w_ctr(base, 0x06);
251 udelay(5);
252 a = (r_str(base) & 0x20) ? 0 : 1;
253 udelay(5);
254 w_ctr(base, 0x07);
255 udelay(5);
256 w_ctr(base, 0x06);
257
258 if (a) {
259 printk
260 ("IMM: IEEE1284 negotiate indicates no data available.\n");
261 imm_fail(tmp, DID_ERROR);
262 }
263 return a;
264}
265
266/*
267 * Clear EPP timeout bit.
268 */
269static inline void epp_reset(unsigned short ppb)
270{
271 int i;
272
273 i = r_str(ppb);
274 w_str(ppb, i);
275 w_str(ppb, i & 0xfe);
276}
277
278/*
279 * Wait for empty ECP fifo (if we are in ECP fifo mode only)
280 */
281static inline void ecp_sync(imm_struct *dev)
282{
283 int i, ppb_hi = dev->base_hi;
284
285 if (ppb_hi == 0)
286 return;
287
288 if ((r_ecr(ppb_hi) & 0xe0) == 0x60) { /* mode 011 == ECP fifo mode */
289 for (i = 0; i < 100; i++) {
290 if (r_ecr(ppb_hi) & 0x01)
291 return;
292 udelay(5);
293 }
294 printk("imm: ECP sync failed as data still present in FIFO.\n");
295 }
296}
297
298static int imm_byte_out(unsigned short base, const char *buffer, int len)
299{
300 int i;
301
302 w_ctr(base, 0x4); /* apparently a sane mode */
303 for (i = len >> 1; i; i--) {
304 w_dtr(base, *buffer++);
305 w_ctr(base, 0x5); /* Drop STROBE low */
306 w_dtr(base, *buffer++);
307 w_ctr(base, 0x0); /* STROBE high + INIT low */
308 }
309 w_ctr(base, 0x4); /* apparently a sane mode */
310 return 1; /* All went well - we hope! */
311}
312
313static int imm_nibble_in(unsigned short base, char *buffer, int len)
314{
315 unsigned char l;
316 int i;
317
318 /*
319 * The following is based on documented timing signals
320 */
321 w_ctr(base, 0x4);
322 for (i = len; i; i--) {
323 w_ctr(base, 0x6);
324 l = (r_str(base) & 0xf0) >> 4;
325 w_ctr(base, 0x5);
326 *buffer++ = (r_str(base) & 0xf0) | l;
327 w_ctr(base, 0x4);
328 }
329 return 1; /* All went well - we hope! */
330}
331
332static int imm_byte_in(unsigned short base, char *buffer, int len)
333{
334 int i;
335
336 /*
337 * The following is based on documented timing signals
338 */
339 w_ctr(base, 0x4);
340 for (i = len; i; i--) {
341 w_ctr(base, 0x26);
342 *buffer++ = r_dtr(base);
343 w_ctr(base, 0x25);
344 }
345 return 1; /* All went well - we hope! */
346}
347
348static int imm_out(imm_struct *dev, char *buffer, int len)
349{
350 unsigned short ppb = dev->base;
351 int r = imm_wait(dev);
352
353 /*
354 * Make sure that:
355 * a) the SCSI bus is BUSY (device still listening)
356 * b) the device is listening
357 */
358 if ((r & 0x18) != 0x08) {
359 imm_fail(dev, DID_ERROR);
360 printk("IMM: returned SCSI status %2x\n", r);
361 return 0;
362 }
363 switch (dev->mode) {
364 case IMM_EPP_32:
365 case IMM_EPP_16:
366 case IMM_EPP_8:
367 epp_reset(ppb);
368 w_ctr(ppb, 0x4);
369#ifdef CONFIG_SCSI_IZIP_EPP16
370 if (!(((long) buffer | len) & 0x01))
371 outsw(ppb + 4, buffer, len >> 1);
372#else
373 if (!(((long) buffer | len) & 0x03))
374 outsl(ppb + 4, buffer, len >> 2);
375#endif
376 else
377 outsb(ppb + 4, buffer, len);
378 w_ctr(ppb, 0xc);
379 r = !(r_str(ppb) & 0x01);
380 w_ctr(ppb, 0xc);
381 ecp_sync(dev);
382 break;
383
384 case IMM_NIBBLE:
385 case IMM_PS2:
386 /* 8 bit output, with a loop */
387 r = imm_byte_out(ppb, buffer, len);
388 break;
389
390 default:
391 printk("IMM: bug in imm_out()\n");
392 r = 0;
393 }
394 return r;
395}
396
397static int imm_in(imm_struct *dev, char *buffer, int len)
398{
399 unsigned short ppb = dev->base;
400 int r = imm_wait(dev);
401
402 /*
403 * Make sure that:
404 * a) the SCSI bus is BUSY (device still listening)
405 * b) the device is sending data
406 */
407 if ((r & 0x18) != 0x18) {
408 imm_fail(dev, DID_ERROR);
409 return 0;
410 }
411 switch (dev->mode) {
412 case IMM_NIBBLE:
413 /* 4 bit input, with a loop */
414 r = imm_nibble_in(ppb, buffer, len);
415 w_ctr(ppb, 0xc);
416 break;
417
418 case IMM_PS2:
419 /* 8 bit input, with a loop */
420 r = imm_byte_in(ppb, buffer, len);
421 w_ctr(ppb, 0xc);
422 break;
423
424 case IMM_EPP_32:
425 case IMM_EPP_16:
426 case IMM_EPP_8:
427 epp_reset(ppb);
428 w_ctr(ppb, 0x24);
429#ifdef CONFIG_SCSI_IZIP_EPP16
430 if (!(((long) buffer | len) & 0x01))
431 insw(ppb + 4, buffer, len >> 1);
432#else
433 if (!(((long) buffer | len) & 0x03))
434 insl(ppb + 4, buffer, len >> 2);
435#endif
436 else
437 insb(ppb + 4, buffer, len);
438 w_ctr(ppb, 0x2c);
439 r = !(r_str(ppb) & 0x01);
440 w_ctr(ppb, 0x2c);
441 ecp_sync(dev);
442 break;
443
444 default:
445 printk("IMM: bug in imm_ins()\n");
446 r = 0;
447 break;
448 }
449 return r;
450}
451
452static int imm_cpp(unsigned short ppb, unsigned char b)
453{
454 /*
455 * Comments on udelay values refer to the
456 * Command Packet Protocol (CPP) timing diagram.
457 */
458
459 unsigned char s1, s2, s3;
460 w_ctr(ppb, 0x0c);
461 udelay(2); /* 1 usec - infinite */
462 w_dtr(ppb, 0xaa);
463 udelay(10); /* 7 usec - infinite */
464 w_dtr(ppb, 0x55);
465 udelay(10); /* 7 usec - infinite */
466 w_dtr(ppb, 0x00);
467 udelay(10); /* 7 usec - infinite */
468 w_dtr(ppb, 0xff);
469 udelay(10); /* 7 usec - infinite */
470 s1 = r_str(ppb) & 0xb8;
471 w_dtr(ppb, 0x87);
472 udelay(10); /* 7 usec - infinite */
473 s2 = r_str(ppb) & 0xb8;
474 w_dtr(ppb, 0x78);
475 udelay(10); /* 7 usec - infinite */
476 s3 = r_str(ppb) & 0x38;
477 /*
478 * Values for b are:
479 * 0000 00aa Assign address aa to current device
480 * 0010 00aa Select device aa in EPP Winbond mode
481 * 0010 10aa Select device aa in EPP mode
482 * 0011 xxxx Deselect all devices
483 * 0110 00aa Test device aa
484 * 1101 00aa Select device aa in ECP mode
485 * 1110 00aa Select device aa in Compatible mode
486 */
487 w_dtr(ppb, b);
488 udelay(2); /* 1 usec - infinite */
489 w_ctr(ppb, 0x0c);
490 udelay(10); /* 7 usec - infinite */
491 w_ctr(ppb, 0x0d);
492 udelay(2); /* 1 usec - infinite */
493 w_ctr(ppb, 0x0c);
494 udelay(10); /* 7 usec - infinite */
495 w_dtr(ppb, 0xff);
496 udelay(10); /* 7 usec - infinite */
497
498 /*
499 * The following table is electrical pin values.
500 * (BSY is inverted at the CTR register)
501 *
502 * BSY ACK POut SEL Fault
503 * S1 0 X 1 1 1
504 * S2 1 X 0 1 1
505 * S3 L X 1 1 S
506 *
507 * L => Last device in chain
508 * S => Selected
509 *
510 * Observered values for S1,S2,S3 are:
511 * Disconnect => f8/58/78
512 * Connect => f8/58/70
513 */
514 if ((s1 == 0xb8) && (s2 == 0x18) && (s3 == 0x30))
515 return 1; /* Connected */
516 if ((s1 == 0xb8) && (s2 == 0x18) && (s3 == 0x38))
517 return 0; /* Disconnected */
518
519 return -1; /* No device present */
520}
521
522static inline int imm_connect(imm_struct *dev, int flag)
523{
524 unsigned short ppb = dev->base;
525
526 imm_cpp(ppb, 0xe0); /* Select device 0 in compatible mode */
527 imm_cpp(ppb, 0x30); /* Disconnect all devices */
528
529 if ((dev->mode == IMM_EPP_8) ||
530 (dev->mode == IMM_EPP_16) ||
531 (dev->mode == IMM_EPP_32))
532 return imm_cpp(ppb, 0x28); /* Select device 0 in EPP mode */
533 return imm_cpp(ppb, 0xe0); /* Select device 0 in compatible mode */
534}
535
536static void imm_disconnect(imm_struct *dev)
537{
538 imm_cpp(dev->base, 0x30); /* Disconnect all devices */
539}
540
541static int imm_select(imm_struct *dev, int target)
542{
543 int k;
544 unsigned short ppb = dev->base;
545
546 /*
547 * Firstly we want to make sure there is nothing
548 * holding onto the SCSI bus.
549 */
550 w_ctr(ppb, 0xc);
551
552 k = IMM_SELECT_TMO;
553 do {
554 k--;
555 } while ((r_str(ppb) & 0x08) && (k));
556
557 if (!k)
558 return 0;
559
560 /*
561 * Now assert the SCSI ID (HOST and TARGET) on the data bus
562 */
563 w_ctr(ppb, 0x4);
564 w_dtr(ppb, 0x80 | (1 << target));
565 udelay(1);
566
567 /*
568 * Deassert SELIN first followed by STROBE
569 */
570 w_ctr(ppb, 0xc);
571 w_ctr(ppb, 0xd);
572
573 /*
574 * ACK should drop low while SELIN is deasserted.
575 * FAULT should drop low when the SCSI device latches the bus.
576 */
577 k = IMM_SELECT_TMO;
578 do {
579 k--;
580 }
581 while (!(r_str(ppb) & 0x08) && (k));
582
583 /*
584 * Place the interface back into a sane state (status mode)
585 */
586 w_ctr(ppb, 0xc);
587 return (k) ? 1 : 0;
588}
589
590static int imm_init(imm_struct *dev)
591{
592 if (imm_connect(dev, 0) != 1)
593 return -EIO;
594 imm_reset_pulse(dev->base);
595 mdelay(1); /* Delay to allow devices to settle */
596 imm_disconnect(dev);
597 mdelay(1); /* Another delay to allow devices to settle */
598 return device_check(dev);
599}
600
601static inline int imm_send_command(struct scsi_cmnd *cmd)
602{
603 imm_struct *dev = imm_dev(cmd->device->host);
604 int k;
605
606 /* NOTE: IMM uses byte pairs */
607 for (k = 0; k < cmd->cmd_len; k += 2)
608 if (!imm_out(dev, &cmd->cmnd[k], 2))
609 return 0;
610 return 1;
611}
612
613/*
614 * The bulk flag enables some optimisations in the data transfer loops,
615 * it should be true for any command that transfers data in integral
616 * numbers of sectors.
617 *
618 * The driver appears to remain stable if we speed up the parallel port
619 * i/o in this function, but not elsewhere.
620 */
621static int imm_completion(struct scsi_cmnd *cmd)
622{
623 /* Return codes:
624 * -1 Error
625 * 0 Told to schedule
626 * 1 Finished data transfer
627 */
628 imm_struct *dev = imm_dev(cmd->device->host);
629 unsigned short ppb = dev->base;
630 unsigned long start_jiffies = jiffies;
631
632 unsigned char r, v;
633 int fast, bulk, status;
634
635 v = cmd->cmnd[0];
636 bulk = ((v == READ_6) ||
637 (v == READ_10) || (v == WRITE_6) || (v == WRITE_10));
638
639 /*
640 * We only get here if the drive is ready to comunicate,
641 * hence no need for a full imm_wait.
642 */
643 w_ctr(ppb, 0x0c);
644 r = (r_str(ppb) & 0xb8);
645
646 /*
647 * while (device is not ready to send status byte)
648 * loop;
649 */
650 while (r != (unsigned char) 0xb8) {
651 /*
652 * If we have been running for more than a full timer tick
653 * then take a rest.
654 */
655 if (time_after(jiffies, start_jiffies + 1))
656 return 0;
657
658 /*
659 * FAIL if:
660 * a) Drive status is screwy (!ready && !present)
661 * b) Drive is requesting/sending more data than expected
662 */
663 if (((r & 0x88) != 0x88) || (cmd->SCp.this_residual <= 0)) {
664 imm_fail(dev, DID_ERROR);
665 return -1; /* ERROR_RETURN */
666 }
667 /* determine if we should use burst I/O */
668 if (dev->rd == 0) {
669 fast = (bulk
670 && (cmd->SCp.this_residual >=
671 IMM_BURST_SIZE)) ? IMM_BURST_SIZE : 2;
672 status = imm_out(dev, cmd->SCp.ptr, fast);
673 } else {
674 fast = (bulk
675 && (cmd->SCp.this_residual >=
676 IMM_BURST_SIZE)) ? IMM_BURST_SIZE : 1;
677 status = imm_in(dev, cmd->SCp.ptr, fast);
678 }
679
680 cmd->SCp.ptr += fast;
681 cmd->SCp.this_residual -= fast;
682
683 if (!status) {
684 imm_fail(dev, DID_BUS_BUSY);
685 return -1; /* ERROR_RETURN */
686 }
687 if (cmd->SCp.buffer && !cmd->SCp.this_residual) {
688 /* if scatter/gather, advance to the next segment */
689 if (cmd->SCp.buffers_residual--) {
690 cmd->SCp.buffer = sg_next(cmd->SCp.buffer);
691 cmd->SCp.this_residual =
692 cmd->SCp.buffer->length;
693 cmd->SCp.ptr = sg_virt(cmd->SCp.buffer);
694
695 /*
696 * Make sure that we transfer even number of bytes
697 * otherwise it makes imm_byte_out() messy.
698 */
699 if (cmd->SCp.this_residual & 0x01)
700 cmd->SCp.this_residual++;
701 }
702 }
703 /* Now check to see if the drive is ready to comunicate */
704 w_ctr(ppb, 0x0c);
705 r = (r_str(ppb) & 0xb8);
706
707 /* If not, drop back down to the scheduler and wait a timer tick */
708 if (!(r & 0x80))
709 return 0;
710 }
711 return 1; /* FINISH_RETURN */
712}
713
714/*
715 * Since the IMM itself doesn't generate interrupts, we use
716 * the scheduler's task queue to generate a stream of call-backs and
717 * complete the request when the drive is ready.
718 */
719static void imm_interrupt(struct work_struct *work)
720{
721 imm_struct *dev = container_of(work, imm_struct, imm_tq.work);
722 struct scsi_cmnd *cmd = dev->cur_cmd;
723 struct Scsi_Host *host = cmd->device->host;
724 unsigned long flags;
725
726 if (imm_engine(dev, cmd)) {
727 schedule_delayed_work(&dev->imm_tq, 1);
728 return;
729 }
730 /* Command must of completed hence it is safe to let go... */
731#if IMM_DEBUG > 0
732 switch ((cmd->result >> 16) & 0xff) {
733 case DID_OK:
734 break;
735 case DID_NO_CONNECT:
736 printk("imm: no device at SCSI ID %i\n", cmd->device->id);
737 break;
738 case DID_BUS_BUSY:
739 printk("imm: BUS BUSY - EPP timeout detected\n");
740 break;
741 case DID_TIME_OUT:
742 printk("imm: unknown timeout\n");
743 break;
744 case DID_ABORT:
745 printk("imm: told to abort\n");
746 break;
747 case DID_PARITY:
748 printk("imm: parity error (???)\n");
749 break;
750 case DID_ERROR:
751 printk("imm: internal driver error\n");
752 break;
753 case DID_RESET:
754 printk("imm: told to reset device\n");
755 break;
756 case DID_BAD_INTR:
757 printk("imm: bad interrupt (???)\n");
758 break;
759 default:
760 printk("imm: bad return code (%02x)\n",
761 (cmd->result >> 16) & 0xff);
762 }
763#endif
764
765 if (cmd->SCp.phase > 1)
766 imm_disconnect(dev);
767
768 imm_pb_dismiss(dev);
769
770 spin_lock_irqsave(host->host_lock, flags);
771 dev->cur_cmd = NULL;
772 cmd->scsi_done(cmd);
773 spin_unlock_irqrestore(host->host_lock, flags);
774 return;
775}
776
777static int imm_engine(imm_struct *dev, struct scsi_cmnd *cmd)
778{
779 unsigned short ppb = dev->base;
780 unsigned char l = 0, h = 0;
781 int retv, x;
782
783 /* First check for any errors that may have occurred
784 * Here we check for internal errors
785 */
786 if (dev->failed)
787 return 0;
788
789 switch (cmd->SCp.phase) {
790 case 0: /* Phase 0 - Waiting for parport */
791 if (time_after(jiffies, dev->jstart + HZ)) {
792 /*
793 * We waited more than a second
794 * for parport to call us
795 */
796 imm_fail(dev, DID_BUS_BUSY);
797 return 0;
798 }
799 return 1; /* wait until imm_wakeup claims parport */
800
801 case 1: /* Phase 1 - Connected */
802 imm_connect(dev, CONNECT_EPP_MAYBE);
803 cmd->SCp.phase++;
804 fallthrough;
805
806 case 2: /* Phase 2 - We are now talking to the scsi bus */
807 if (!imm_select(dev, scmd_id(cmd))) {
808 imm_fail(dev, DID_NO_CONNECT);
809 return 0;
810 }
811 cmd->SCp.phase++;
812 fallthrough;
813
814 case 3: /* Phase 3 - Ready to accept a command */
815 w_ctr(ppb, 0x0c);
816 if (!(r_str(ppb) & 0x80))
817 return 1;
818
819 if (!imm_send_command(cmd))
820 return 0;
821 cmd->SCp.phase++;
822 fallthrough;
823
824 case 4: /* Phase 4 - Setup scatter/gather buffers */
825 if (scsi_bufflen(cmd)) {
826 cmd->SCp.buffer = scsi_sglist(cmd);
827 cmd->SCp.this_residual = cmd->SCp.buffer->length;
828 cmd->SCp.ptr = sg_virt(cmd->SCp.buffer);
829 } else {
830 cmd->SCp.buffer = NULL;
831 cmd->SCp.this_residual = 0;
832 cmd->SCp.ptr = NULL;
833 }
834 cmd->SCp.buffers_residual = scsi_sg_count(cmd) - 1;
835 cmd->SCp.phase++;
836 if (cmd->SCp.this_residual & 0x01)
837 cmd->SCp.this_residual++;
838 fallthrough;
839
840 case 5: /* Phase 5 - Pre-Data transfer stage */
841 /* Spin lock for BUSY */
842 w_ctr(ppb, 0x0c);
843 if (!(r_str(ppb) & 0x80))
844 return 1;
845
846 /* Require negotiation for read requests */
847 x = (r_str(ppb) & 0xb8);
848 dev->rd = (x & 0x10) ? 1 : 0;
849 dev->dp = (x & 0x20) ? 0 : 1;
850
851 if ((dev->dp) && (dev->rd))
852 if (imm_negotiate(dev))
853 return 0;
854 cmd->SCp.phase++;
855 fallthrough;
856
857 case 6: /* Phase 6 - Data transfer stage */
858 /* Spin lock for BUSY */
859 w_ctr(ppb, 0x0c);
860 if (!(r_str(ppb) & 0x80))
861 return 1;
862
863 if (dev->dp) {
864 retv = imm_completion(cmd);
865 if (retv == -1)
866 return 0;
867 if (retv == 0)
868 return 1;
869 }
870 cmd->SCp.phase++;
871 fallthrough;
872
873 case 7: /* Phase 7 - Post data transfer stage */
874 if ((dev->dp) && (dev->rd)) {
875 if ((dev->mode == IMM_NIBBLE) || (dev->mode == IMM_PS2)) {
876 w_ctr(ppb, 0x4);
877 w_ctr(ppb, 0xc);
878 w_ctr(ppb, 0xe);
879 w_ctr(ppb, 0x4);
880 }
881 }
882 cmd->SCp.phase++;
883 fallthrough;
884
885 case 8: /* Phase 8 - Read status/message */
886 /* Check for data overrun */
887 if (imm_wait(dev) != (unsigned char) 0xb8) {
888 imm_fail(dev, DID_ERROR);
889 return 0;
890 }
891 if (imm_negotiate(dev))
892 return 0;
893 if (imm_in(dev, &l, 1)) { /* read status byte */
894 /* Check for optional message byte */
895 if (imm_wait(dev) == (unsigned char) 0xb8)
896 imm_in(dev, &h, 1);
897 cmd->result = (DID_OK << 16) | (l & STATUS_MASK);
898 }
899 if ((dev->mode == IMM_NIBBLE) || (dev->mode == IMM_PS2)) {
900 w_ctr(ppb, 0x4);
901 w_ctr(ppb, 0xc);
902 w_ctr(ppb, 0xe);
903 w_ctr(ppb, 0x4);
904 }
905 return 0; /* Finished */
906
907 default:
908 printk("imm: Invalid scsi phase\n");
909 }
910 return 0;
911}
912
913static int imm_queuecommand_lck(struct scsi_cmnd *cmd,
914 void (*done)(struct scsi_cmnd *))
915{
916 imm_struct *dev = imm_dev(cmd->device->host);
917
918 if (dev->cur_cmd) {
919 printk("IMM: bug in imm_queuecommand\n");
920 return 0;
921 }
922 dev->failed = 0;
923 dev->jstart = jiffies;
924 dev->cur_cmd = cmd;
925 cmd->scsi_done = done;
926 cmd->result = DID_ERROR << 16; /* default return code */
927 cmd->SCp.phase = 0; /* bus free */
928
929 schedule_delayed_work(&dev->imm_tq, 0);
930
931 imm_pb_claim(dev);
932
933 return 0;
934}
935
936static DEF_SCSI_QCMD(imm_queuecommand)
937
938/*
939 * Apparently the disk->capacity attribute is off by 1 sector
940 * for all disk drives. We add the one here, but it should really
941 * be done in sd.c. Even if it gets fixed there, this will still
942 * work.
943 */
944static int imm_biosparam(struct scsi_device *sdev, struct block_device *dev,
945 sector_t capacity, int ip[])
946{
947 ip[0] = 0x40;
948 ip[1] = 0x20;
949 ip[2] = ((unsigned long) capacity + 1) / (ip[0] * ip[1]);
950 if (ip[2] > 1024) {
951 ip[0] = 0xff;
952 ip[1] = 0x3f;
953 ip[2] = ((unsigned long) capacity + 1) / (ip[0] * ip[1]);
954 }
955 return 0;
956}
957
958static int imm_abort(struct scsi_cmnd *cmd)
959{
960 imm_struct *dev = imm_dev(cmd->device->host);
961 /*
962 * There is no method for aborting commands since Iomega
963 * have tied the SCSI_MESSAGE line high in the interface
964 */
965
966 switch (cmd->SCp.phase) {
967 case 0: /* Do not have access to parport */
968 case 1: /* Have not connected to interface */
969 dev->cur_cmd = NULL; /* Forget the problem */
970 return SUCCESS;
971 default: /* SCSI command sent, can not abort */
972 return FAILED;
973 }
974}
975
976static void imm_reset_pulse(unsigned int base)
977{
978 w_ctr(base, 0x04);
979 w_dtr(base, 0x40);
980 udelay(1);
981 w_ctr(base, 0x0c);
982 w_ctr(base, 0x0d);
983 udelay(50);
984 w_ctr(base, 0x0c);
985 w_ctr(base, 0x04);
986}
987
988static int imm_reset(struct scsi_cmnd *cmd)
989{
990 imm_struct *dev = imm_dev(cmd->device->host);
991
992 if (cmd->SCp.phase)
993 imm_disconnect(dev);
994 dev->cur_cmd = NULL; /* Forget the problem */
995
996 imm_connect(dev, CONNECT_NORMAL);
997 imm_reset_pulse(dev->base);
998 mdelay(1); /* device settle delay */
999 imm_disconnect(dev);
1000 mdelay(1); /* device settle delay */
1001 return SUCCESS;
1002}
1003
1004static int device_check(imm_struct *dev)
1005{
1006 /* This routine looks for a device and then attempts to use EPP
1007 to send a command. If all goes as planned then EPP is available. */
1008
1009 static char cmd[6] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
1010 int loop, old_mode, status, k, ppb = dev->base;
1011 unsigned char l;
1012
1013 old_mode = dev->mode;
1014 for (loop = 0; loop < 8; loop++) {
1015 /* Attempt to use EPP for Test Unit Ready */
1016 if ((ppb & 0x0007) == 0x0000)
1017 dev->mode = IMM_EPP_32;
1018
1019 second_pass:
1020 imm_connect(dev, CONNECT_EPP_MAYBE);
1021 /* Select SCSI device */
1022 if (!imm_select(dev, loop)) {
1023 imm_disconnect(dev);
1024 continue;
1025 }
1026 printk("imm: Found device at ID %i, Attempting to use %s\n",
1027 loop, IMM_MODE_STRING[dev->mode]);
1028
1029 /* Send SCSI command */
1030 status = 1;
1031 w_ctr(ppb, 0x0c);
1032 for (l = 0; (l < 3) && (status); l++)
1033 status = imm_out(dev, &cmd[l << 1], 2);
1034
1035 if (!status) {
1036 imm_disconnect(dev);
1037 imm_connect(dev, CONNECT_EPP_MAYBE);
1038 imm_reset_pulse(dev->base);
1039 udelay(1000);
1040 imm_disconnect(dev);
1041 udelay(1000);
1042 if (dev->mode == IMM_EPP_32) {
1043 dev->mode = old_mode;
1044 goto second_pass;
1045 }
1046 printk("imm: Unable to establish communication\n");
1047 return -EIO;
1048 }
1049 w_ctr(ppb, 0x0c);
1050
1051 k = 1000000; /* 1 Second */
1052 do {
1053 l = r_str(ppb);
1054 k--;
1055 udelay(1);
1056 } while (!(l & 0x80) && (k));
1057
1058 l &= 0xb8;
1059
1060 if (l != 0xb8) {
1061 imm_disconnect(dev);
1062 imm_connect(dev, CONNECT_EPP_MAYBE);
1063 imm_reset_pulse(dev->base);
1064 udelay(1000);
1065 imm_disconnect(dev);
1066 udelay(1000);
1067 if (dev->mode == IMM_EPP_32) {
1068 dev->mode = old_mode;
1069 goto second_pass;
1070 }
1071 printk
1072 ("imm: Unable to establish communication\n");
1073 return -EIO;
1074 }
1075 imm_disconnect(dev);
1076 printk
1077 ("imm: Communication established at 0x%x with ID %i using %s\n",
1078 ppb, loop, IMM_MODE_STRING[dev->mode]);
1079 imm_connect(dev, CONNECT_EPP_MAYBE);
1080 imm_reset_pulse(dev->base);
1081 udelay(1000);
1082 imm_disconnect(dev);
1083 udelay(1000);
1084 return 0;
1085 }
1086 printk("imm: No devices found\n");
1087 return -ENODEV;
1088}
1089
1090/*
1091 * imm cannot deal with highmem, so this causes all IO pages for this host
1092 * to reside in low memory (hence mapped)
1093 */
1094static int imm_adjust_queue(struct scsi_device *device)
1095{
1096 blk_queue_bounce_limit(device->request_queue, BLK_BOUNCE_HIGH);
1097 return 0;
1098}
1099
1100static struct scsi_host_template imm_template = {
1101 .module = THIS_MODULE,
1102 .proc_name = "imm",
1103 .show_info = imm_show_info,
1104 .write_info = imm_write_info,
1105 .name = "Iomega VPI2 (imm) interface",
1106 .queuecommand = imm_queuecommand,
1107 .eh_abort_handler = imm_abort,
1108 .eh_host_reset_handler = imm_reset,
1109 .bios_param = imm_biosparam,
1110 .this_id = 7,
1111 .sg_tablesize = SG_ALL,
1112 .can_queue = 1,
1113 .slave_alloc = imm_adjust_queue,
1114};
1115
1116/***************************************************************************
1117 * Parallel port probing routines *
1118 ***************************************************************************/
1119
1120static LIST_HEAD(imm_hosts);
1121
1122/*
1123 * Finds the first available device number that can be alloted to the
1124 * new imm device and returns the address of the previous node so that
1125 * we can add to the tail and have a list in the ascending order.
1126 */
1127
1128static inline imm_struct *find_parent(void)
1129{
1130 imm_struct *dev, *par = NULL;
1131 unsigned int cnt = 0;
1132
1133 if (list_empty(&imm_hosts))
1134 return NULL;
1135
1136 list_for_each_entry(dev, &imm_hosts, list) {
1137 if (dev->dev_no != cnt)
1138 return par;
1139 cnt++;
1140 par = dev;
1141 }
1142
1143 return par;
1144}
1145
1146static int __imm_attach(struct parport *pb)
1147{
1148 struct Scsi_Host *host;
1149 imm_struct *dev, *temp;
1150 DECLARE_WAIT_QUEUE_HEAD_ONSTACK(waiting);
1151 DEFINE_WAIT(wait);
1152 int ports;
1153 int modes, ppb;
1154 int err = -ENOMEM;
1155 struct pardev_cb imm_cb;
1156
1157 init_waitqueue_head(&waiting);
1158
1159 dev = kzalloc(sizeof(imm_struct), GFP_KERNEL);
1160 if (!dev)
1161 return -ENOMEM;
1162
1163
1164 dev->base = -1;
1165 dev->mode = IMM_AUTODETECT;
1166 INIT_LIST_HEAD(&dev->list);
1167
1168 temp = find_parent();
1169 if (temp)
1170 dev->dev_no = temp->dev_no + 1;
1171
1172 memset(&imm_cb, 0, sizeof(imm_cb));
1173 imm_cb.private = dev;
1174 imm_cb.wakeup = imm_wakeup;
1175
1176 dev->dev = parport_register_dev_model(pb, "imm", &imm_cb, dev->dev_no);
1177 if (!dev->dev)
1178 goto out;
1179
1180
1181 /* Claim the bus so it remembers what we do to the control
1182 * registers. [ CTR and ECP ]
1183 */
1184 err = -EBUSY;
1185 dev->waiting = &waiting;
1186 prepare_to_wait(&waiting, &wait, TASK_UNINTERRUPTIBLE);
1187 if (imm_pb_claim(dev))
1188 schedule_timeout(3 * HZ);
1189 if (dev->wanted) {
1190 printk(KERN_ERR "imm%d: failed to claim parport because "
1191 "a pardevice is owning the port for too long "
1192 "time!\n", pb->number);
1193 imm_pb_dismiss(dev);
1194 dev->waiting = NULL;
1195 finish_wait(&waiting, &wait);
1196 goto out1;
1197 }
1198 dev->waiting = NULL;
1199 finish_wait(&waiting, &wait);
1200 ppb = dev->base = dev->dev->port->base;
1201 dev->base_hi = dev->dev->port->base_hi;
1202 w_ctr(ppb, 0x0c);
1203 modes = dev->dev->port->modes;
1204
1205 /* Mode detection works up the chain of speed
1206 * This avoids a nasty if-then-else-if-... tree
1207 */
1208 dev->mode = IMM_NIBBLE;
1209
1210 if (modes & PARPORT_MODE_TRISTATE)
1211 dev->mode = IMM_PS2;
1212
1213 /* Done configuration */
1214
1215 err = imm_init(dev);
1216
1217 imm_pb_release(dev);
1218
1219 if (err)
1220 goto out1;
1221
1222 /* now the glue ... */
1223 if (dev->mode == IMM_NIBBLE || dev->mode == IMM_PS2)
1224 ports = 3;
1225 else
1226 ports = 8;
1227
1228 INIT_DELAYED_WORK(&dev->imm_tq, imm_interrupt);
1229
1230 err = -ENOMEM;
1231 host = scsi_host_alloc(&imm_template, sizeof(imm_struct *));
1232 if (!host)
1233 goto out1;
1234 host->io_port = pb->base;
1235 host->n_io_port = ports;
1236 host->dma_channel = -1;
1237 host->unique_id = pb->number;
1238 *(imm_struct **)&host->hostdata = dev;
1239 dev->host = host;
1240 if (!temp)
1241 list_add_tail(&dev->list, &imm_hosts);
1242 else
1243 list_add_tail(&dev->list, &temp->list);
1244 err = scsi_add_host(host, NULL);
1245 if (err)
1246 goto out2;
1247 scsi_scan_host(host);
1248 return 0;
1249
1250out2:
1251 list_del_init(&dev->list);
1252 scsi_host_put(host);
1253out1:
1254 parport_unregister_device(dev->dev);
1255out:
1256 kfree(dev);
1257 return err;
1258}
1259
1260static void imm_attach(struct parport *pb)
1261{
1262 __imm_attach(pb);
1263}
1264
1265static void imm_detach(struct parport *pb)
1266{
1267 imm_struct *dev;
1268 list_for_each_entry(dev, &imm_hosts, list) {
1269 if (dev->dev->port == pb) {
1270 list_del_init(&dev->list);
1271 scsi_remove_host(dev->host);
1272 scsi_host_put(dev->host);
1273 parport_unregister_device(dev->dev);
1274 kfree(dev);
1275 break;
1276 }
1277 }
1278}
1279
1280static struct parport_driver imm_driver = {
1281 .name = "imm",
1282 .match_port = imm_attach,
1283 .detach = imm_detach,
1284 .devmodel = true,
1285};
1286
1287static int __init imm_driver_init(void)
1288{
1289 printk("imm: Version %s\n", IMM_VERSION);
1290 return parport_register_driver(&imm_driver);
1291}
1292
1293static void __exit imm_driver_exit(void)
1294{
1295 parport_unregister_driver(&imm_driver);
1296}
1297
1298module_init(imm_driver_init);
1299module_exit(imm_driver_exit);
1300
1301MODULE_LICENSE("GPL");
1/* imm.c -- low level driver for the IOMEGA MatchMaker
2 * parallel port SCSI host adapter.
3 *
4 * (The IMM is the embedded controller in the ZIP Plus drive.)
5 *
6 * My unofficial company acronym list is 21 pages long:
7 * FLA: Four letter acronym with built in facility for
8 * future expansion to five letters.
9 */
10
11#include <linux/init.h>
12#include <linux/kernel.h>
13#include <linux/module.h>
14#include <linux/blkdev.h>
15#include <linux/parport.h>
16#include <linux/workqueue.h>
17#include <linux/delay.h>
18#include <linux/slab.h>
19#include <asm/io.h>
20
21#include <scsi/scsi.h>
22#include <scsi/scsi_cmnd.h>
23#include <scsi/scsi_device.h>
24#include <scsi/scsi_host.h>
25
26/* The following #define is to avoid a clash with hosts.c */
27#define IMM_PROBE_SPP 0x0001
28#define IMM_PROBE_PS2 0x0002
29#define IMM_PROBE_ECR 0x0010
30#define IMM_PROBE_EPP17 0x0100
31#define IMM_PROBE_EPP19 0x0200
32
33
34typedef struct {
35 struct pardevice *dev; /* Parport device entry */
36 int base; /* Actual port address */
37 int base_hi; /* Hi Base address for ECP-ISA chipset */
38 int mode; /* Transfer mode */
39 struct scsi_cmnd *cur_cmd; /* Current queued command */
40 struct delayed_work imm_tq; /* Polling interrupt stuff */
41 unsigned long jstart; /* Jiffies at start */
42 unsigned failed:1; /* Failure flag */
43 unsigned dp:1; /* Data phase present */
44 unsigned rd:1; /* Read data in data phase */
45 unsigned wanted:1; /* Parport sharing busy flag */
46 wait_queue_head_t *waiting;
47 struct Scsi_Host *host;
48 struct list_head list;
49} imm_struct;
50
51static void imm_reset_pulse(unsigned int base);
52static int device_check(imm_struct *dev);
53
54#include "imm.h"
55
56static inline imm_struct *imm_dev(struct Scsi_Host *host)
57{
58 return *(imm_struct **)&host->hostdata;
59}
60
61static DEFINE_SPINLOCK(arbitration_lock);
62
63static void got_it(imm_struct *dev)
64{
65 dev->base = dev->dev->port->base;
66 if (dev->cur_cmd)
67 dev->cur_cmd->SCp.phase = 1;
68 else
69 wake_up(dev->waiting);
70}
71
72static void imm_wakeup(void *ref)
73{
74 imm_struct *dev = (imm_struct *) ref;
75 unsigned long flags;
76
77 spin_lock_irqsave(&arbitration_lock, flags);
78 if (dev->wanted) {
79 parport_claim(dev->dev);
80 got_it(dev);
81 dev->wanted = 0;
82 }
83 spin_unlock_irqrestore(&arbitration_lock, flags);
84}
85
86static int imm_pb_claim(imm_struct *dev)
87{
88 unsigned long flags;
89 int res = 1;
90 spin_lock_irqsave(&arbitration_lock, flags);
91 if (parport_claim(dev->dev) == 0) {
92 got_it(dev);
93 res = 0;
94 }
95 dev->wanted = res;
96 spin_unlock_irqrestore(&arbitration_lock, flags);
97 return res;
98}
99
100static void imm_pb_dismiss(imm_struct *dev)
101{
102 unsigned long flags;
103 int wanted;
104 spin_lock_irqsave(&arbitration_lock, flags);
105 wanted = dev->wanted;
106 dev->wanted = 0;
107 spin_unlock_irqrestore(&arbitration_lock, flags);
108 if (!wanted)
109 parport_release(dev->dev);
110}
111
112static inline void imm_pb_release(imm_struct *dev)
113{
114 parport_release(dev->dev);
115}
116
117/* This is to give the imm driver a way to modify the timings (and other
118 * parameters) by writing to the /proc/scsi/imm/0 file.
119 * Very simple method really... (Too simple, no error checking :( )
120 * Reason: Kernel hackers HATE having to unload and reload modules for
121 * testing...
122 * Also gives a method to use a script to obtain optimum timings (TODO)
123 */
124static int imm_write_info(struct Scsi_Host *host, char *buffer, int length)
125{
126 imm_struct *dev = imm_dev(host);
127
128 if ((length > 5) && (strncmp(buffer, "mode=", 5) == 0)) {
129 dev->mode = simple_strtoul(buffer + 5, NULL, 0);
130 return length;
131 }
132 printk("imm /proc: invalid variable\n");
133 return -EINVAL;
134}
135
136static int imm_show_info(struct seq_file *m, struct Scsi_Host *host)
137{
138 imm_struct *dev = imm_dev(host);
139
140 seq_printf(m, "Version : %s\n", IMM_VERSION);
141 seq_printf(m, "Parport : %s\n", dev->dev->port->name);
142 seq_printf(m, "Mode : %s\n", IMM_MODE_STRING[dev->mode]);
143 return 0;
144}
145
146#if IMM_DEBUG > 0
147#define imm_fail(x,y) printk("imm: imm_fail(%i) from %s at line %d\n",\
148 y, __func__, __LINE__); imm_fail_func(x,y);
149static inline void
150imm_fail_func(imm_struct *dev, int error_code)
151#else
152static inline void
153imm_fail(imm_struct *dev, int error_code)
154#endif
155{
156 /* If we fail a device then we trash status / message bytes */
157 if (dev->cur_cmd) {
158 dev->cur_cmd->result = error_code << 16;
159 dev->failed = 1;
160 }
161}
162
163/*
164 * Wait for the high bit to be set.
165 *
166 * In principle, this could be tied to an interrupt, but the adapter
167 * doesn't appear to be designed to support interrupts. We spin on
168 * the 0x80 ready bit.
169 */
170static unsigned char imm_wait(imm_struct *dev)
171{
172 int k;
173 unsigned short ppb = dev->base;
174 unsigned char r;
175
176 w_ctr(ppb, 0x0c);
177
178 k = IMM_SPIN_TMO;
179 do {
180 r = r_str(ppb);
181 k--;
182 udelay(1);
183 }
184 while (!(r & 0x80) && (k));
185
186 /*
187 * STR register (LPT base+1) to SCSI mapping:
188 *
189 * STR imm imm
190 * ===================================
191 * 0x80 S_REQ S_REQ
192 * 0x40 !S_BSY (????)
193 * 0x20 !S_CD !S_CD
194 * 0x10 !S_IO !S_IO
195 * 0x08 (????) !S_BSY
196 *
197 * imm imm meaning
198 * ==================================
199 * 0xf0 0xb8 Bit mask
200 * 0xc0 0x88 ZIP wants more data
201 * 0xd0 0x98 ZIP wants to send more data
202 * 0xe0 0xa8 ZIP is expecting SCSI command data
203 * 0xf0 0xb8 end of transfer, ZIP is sending status
204 */
205 w_ctr(ppb, 0x04);
206 if (k)
207 return (r & 0xb8);
208
209 /* Counter expired - Time out occurred */
210 imm_fail(dev, DID_TIME_OUT);
211 printk("imm timeout in imm_wait\n");
212 return 0; /* command timed out */
213}
214
215static int imm_negotiate(imm_struct * tmp)
216{
217 /*
218 * The following is supposedly the IEEE 1284-1994 negotiate
219 * sequence. I have yet to obtain a copy of the above standard
220 * so this is a bit of a guess...
221 *
222 * A fair chunk of this is based on the Linux parport implementation
223 * of IEEE 1284.
224 *
225 * Return 0 if data available
226 * 1 if no data available
227 */
228
229 unsigned short base = tmp->base;
230 unsigned char a, mode;
231
232 switch (tmp->mode) {
233 case IMM_NIBBLE:
234 mode = 0x00;
235 break;
236 case IMM_PS2:
237 mode = 0x01;
238 break;
239 default:
240 return 0;
241 }
242
243 w_ctr(base, 0x04);
244 udelay(5);
245 w_dtr(base, mode);
246 udelay(100);
247 w_ctr(base, 0x06);
248 udelay(5);
249 a = (r_str(base) & 0x20) ? 0 : 1;
250 udelay(5);
251 w_ctr(base, 0x07);
252 udelay(5);
253 w_ctr(base, 0x06);
254
255 if (a) {
256 printk
257 ("IMM: IEEE1284 negotiate indicates no data available.\n");
258 imm_fail(tmp, DID_ERROR);
259 }
260 return a;
261}
262
263/*
264 * Clear EPP timeout bit.
265 */
266static inline void epp_reset(unsigned short ppb)
267{
268 int i;
269
270 i = r_str(ppb);
271 w_str(ppb, i);
272 w_str(ppb, i & 0xfe);
273}
274
275/*
276 * Wait for empty ECP fifo (if we are in ECP fifo mode only)
277 */
278static inline void ecp_sync(imm_struct *dev)
279{
280 int i, ppb_hi = dev->base_hi;
281
282 if (ppb_hi == 0)
283 return;
284
285 if ((r_ecr(ppb_hi) & 0xe0) == 0x60) { /* mode 011 == ECP fifo mode */
286 for (i = 0; i < 100; i++) {
287 if (r_ecr(ppb_hi) & 0x01)
288 return;
289 udelay(5);
290 }
291 printk("imm: ECP sync failed as data still present in FIFO.\n");
292 }
293}
294
295static int imm_byte_out(unsigned short base, const char *buffer, int len)
296{
297 int i;
298
299 w_ctr(base, 0x4); /* apparently a sane mode */
300 for (i = len >> 1; i; i--) {
301 w_dtr(base, *buffer++);
302 w_ctr(base, 0x5); /* Drop STROBE low */
303 w_dtr(base, *buffer++);
304 w_ctr(base, 0x0); /* STROBE high + INIT low */
305 }
306 w_ctr(base, 0x4); /* apparently a sane mode */
307 return 1; /* All went well - we hope! */
308}
309
310static int imm_nibble_in(unsigned short base, char *buffer, int len)
311{
312 unsigned char l;
313 int i;
314
315 /*
316 * The following is based on documented timing signals
317 */
318 w_ctr(base, 0x4);
319 for (i = len; i; i--) {
320 w_ctr(base, 0x6);
321 l = (r_str(base) & 0xf0) >> 4;
322 w_ctr(base, 0x5);
323 *buffer++ = (r_str(base) & 0xf0) | l;
324 w_ctr(base, 0x4);
325 }
326 return 1; /* All went well - we hope! */
327}
328
329static int imm_byte_in(unsigned short base, char *buffer, int len)
330{
331 int i;
332
333 /*
334 * The following is based on documented timing signals
335 */
336 w_ctr(base, 0x4);
337 for (i = len; i; i--) {
338 w_ctr(base, 0x26);
339 *buffer++ = r_dtr(base);
340 w_ctr(base, 0x25);
341 }
342 return 1; /* All went well - we hope! */
343}
344
345static int imm_out(imm_struct *dev, char *buffer, int len)
346{
347 unsigned short ppb = dev->base;
348 int r = imm_wait(dev);
349
350 /*
351 * Make sure that:
352 * a) the SCSI bus is BUSY (device still listening)
353 * b) the device is listening
354 */
355 if ((r & 0x18) != 0x08) {
356 imm_fail(dev, DID_ERROR);
357 printk("IMM: returned SCSI status %2x\n", r);
358 return 0;
359 }
360 switch (dev->mode) {
361 case IMM_EPP_32:
362 case IMM_EPP_16:
363 case IMM_EPP_8:
364 epp_reset(ppb);
365 w_ctr(ppb, 0x4);
366#ifdef CONFIG_SCSI_IZIP_EPP16
367 if (!(((long) buffer | len) & 0x01))
368 outsw(ppb + 4, buffer, len >> 1);
369#else
370 if (!(((long) buffer | len) & 0x03))
371 outsl(ppb + 4, buffer, len >> 2);
372#endif
373 else
374 outsb(ppb + 4, buffer, len);
375 w_ctr(ppb, 0xc);
376 r = !(r_str(ppb) & 0x01);
377 w_ctr(ppb, 0xc);
378 ecp_sync(dev);
379 break;
380
381 case IMM_NIBBLE:
382 case IMM_PS2:
383 /* 8 bit output, with a loop */
384 r = imm_byte_out(ppb, buffer, len);
385 break;
386
387 default:
388 printk("IMM: bug in imm_out()\n");
389 r = 0;
390 }
391 return r;
392}
393
394static int imm_in(imm_struct *dev, char *buffer, int len)
395{
396 unsigned short ppb = dev->base;
397 int r = imm_wait(dev);
398
399 /*
400 * Make sure that:
401 * a) the SCSI bus is BUSY (device still listening)
402 * b) the device is sending data
403 */
404 if ((r & 0x18) != 0x18) {
405 imm_fail(dev, DID_ERROR);
406 return 0;
407 }
408 switch (dev->mode) {
409 case IMM_NIBBLE:
410 /* 4 bit input, with a loop */
411 r = imm_nibble_in(ppb, buffer, len);
412 w_ctr(ppb, 0xc);
413 break;
414
415 case IMM_PS2:
416 /* 8 bit input, with a loop */
417 r = imm_byte_in(ppb, buffer, len);
418 w_ctr(ppb, 0xc);
419 break;
420
421 case IMM_EPP_32:
422 case IMM_EPP_16:
423 case IMM_EPP_8:
424 epp_reset(ppb);
425 w_ctr(ppb, 0x24);
426#ifdef CONFIG_SCSI_IZIP_EPP16
427 if (!(((long) buffer | len) & 0x01))
428 insw(ppb + 4, buffer, len >> 1);
429#else
430 if (!(((long) buffer | len) & 0x03))
431 insl(ppb + 4, buffer, len >> 2);
432#endif
433 else
434 insb(ppb + 4, buffer, len);
435 w_ctr(ppb, 0x2c);
436 r = !(r_str(ppb) & 0x01);
437 w_ctr(ppb, 0x2c);
438 ecp_sync(dev);
439 break;
440
441 default:
442 printk("IMM: bug in imm_ins()\n");
443 r = 0;
444 break;
445 }
446 return r;
447}
448
449static int imm_cpp(unsigned short ppb, unsigned char b)
450{
451 /*
452 * Comments on udelay values refer to the
453 * Command Packet Protocol (CPP) timing diagram.
454 */
455
456 unsigned char s1, s2, s3;
457 w_ctr(ppb, 0x0c);
458 udelay(2); /* 1 usec - infinite */
459 w_dtr(ppb, 0xaa);
460 udelay(10); /* 7 usec - infinite */
461 w_dtr(ppb, 0x55);
462 udelay(10); /* 7 usec - infinite */
463 w_dtr(ppb, 0x00);
464 udelay(10); /* 7 usec - infinite */
465 w_dtr(ppb, 0xff);
466 udelay(10); /* 7 usec - infinite */
467 s1 = r_str(ppb) & 0xb8;
468 w_dtr(ppb, 0x87);
469 udelay(10); /* 7 usec - infinite */
470 s2 = r_str(ppb) & 0xb8;
471 w_dtr(ppb, 0x78);
472 udelay(10); /* 7 usec - infinite */
473 s3 = r_str(ppb) & 0x38;
474 /*
475 * Values for b are:
476 * 0000 00aa Assign address aa to current device
477 * 0010 00aa Select device aa in EPP Winbond mode
478 * 0010 10aa Select device aa in EPP mode
479 * 0011 xxxx Deselect all devices
480 * 0110 00aa Test device aa
481 * 1101 00aa Select device aa in ECP mode
482 * 1110 00aa Select device aa in Compatible mode
483 */
484 w_dtr(ppb, b);
485 udelay(2); /* 1 usec - infinite */
486 w_ctr(ppb, 0x0c);
487 udelay(10); /* 7 usec - infinite */
488 w_ctr(ppb, 0x0d);
489 udelay(2); /* 1 usec - infinite */
490 w_ctr(ppb, 0x0c);
491 udelay(10); /* 7 usec - infinite */
492 w_dtr(ppb, 0xff);
493 udelay(10); /* 7 usec - infinite */
494
495 /*
496 * The following table is electrical pin values.
497 * (BSY is inverted at the CTR register)
498 *
499 * BSY ACK POut SEL Fault
500 * S1 0 X 1 1 1
501 * S2 1 X 0 1 1
502 * S3 L X 1 1 S
503 *
504 * L => Last device in chain
505 * S => Selected
506 *
507 * Observered values for S1,S2,S3 are:
508 * Disconnect => f8/58/78
509 * Connect => f8/58/70
510 */
511 if ((s1 == 0xb8) && (s2 == 0x18) && (s3 == 0x30))
512 return 1; /* Connected */
513 if ((s1 == 0xb8) && (s2 == 0x18) && (s3 == 0x38))
514 return 0; /* Disconnected */
515
516 return -1; /* No device present */
517}
518
519static inline int imm_connect(imm_struct *dev, int flag)
520{
521 unsigned short ppb = dev->base;
522
523 imm_cpp(ppb, 0xe0); /* Select device 0 in compatible mode */
524 imm_cpp(ppb, 0x30); /* Disconnect all devices */
525
526 if ((dev->mode == IMM_EPP_8) ||
527 (dev->mode == IMM_EPP_16) ||
528 (dev->mode == IMM_EPP_32))
529 return imm_cpp(ppb, 0x28); /* Select device 0 in EPP mode */
530 return imm_cpp(ppb, 0xe0); /* Select device 0 in compatible mode */
531}
532
533static void imm_disconnect(imm_struct *dev)
534{
535 imm_cpp(dev->base, 0x30); /* Disconnect all devices */
536}
537
538static int imm_select(imm_struct *dev, int target)
539{
540 int k;
541 unsigned short ppb = dev->base;
542
543 /*
544 * Firstly we want to make sure there is nothing
545 * holding onto the SCSI bus.
546 */
547 w_ctr(ppb, 0xc);
548
549 k = IMM_SELECT_TMO;
550 do {
551 k--;
552 } while ((r_str(ppb) & 0x08) && (k));
553
554 if (!k)
555 return 0;
556
557 /*
558 * Now assert the SCSI ID (HOST and TARGET) on the data bus
559 */
560 w_ctr(ppb, 0x4);
561 w_dtr(ppb, 0x80 | (1 << target));
562 udelay(1);
563
564 /*
565 * Deassert SELIN first followed by STROBE
566 */
567 w_ctr(ppb, 0xc);
568 w_ctr(ppb, 0xd);
569
570 /*
571 * ACK should drop low while SELIN is deasserted.
572 * FAULT should drop low when the SCSI device latches the bus.
573 */
574 k = IMM_SELECT_TMO;
575 do {
576 k--;
577 }
578 while (!(r_str(ppb) & 0x08) && (k));
579
580 /*
581 * Place the interface back into a sane state (status mode)
582 */
583 w_ctr(ppb, 0xc);
584 return (k) ? 1 : 0;
585}
586
587static int imm_init(imm_struct *dev)
588{
589 if (imm_connect(dev, 0) != 1)
590 return -EIO;
591 imm_reset_pulse(dev->base);
592 mdelay(1); /* Delay to allow devices to settle */
593 imm_disconnect(dev);
594 mdelay(1); /* Another delay to allow devices to settle */
595 return device_check(dev);
596}
597
598static inline int imm_send_command(struct scsi_cmnd *cmd)
599{
600 imm_struct *dev = imm_dev(cmd->device->host);
601 int k;
602
603 /* NOTE: IMM uses byte pairs */
604 for (k = 0; k < cmd->cmd_len; k += 2)
605 if (!imm_out(dev, &cmd->cmnd[k], 2))
606 return 0;
607 return 1;
608}
609
610/*
611 * The bulk flag enables some optimisations in the data transfer loops,
612 * it should be true for any command that transfers data in integral
613 * numbers of sectors.
614 *
615 * The driver appears to remain stable if we speed up the parallel port
616 * i/o in this function, but not elsewhere.
617 */
618static int imm_completion(struct scsi_cmnd *cmd)
619{
620 /* Return codes:
621 * -1 Error
622 * 0 Told to schedule
623 * 1 Finished data transfer
624 */
625 imm_struct *dev = imm_dev(cmd->device->host);
626 unsigned short ppb = dev->base;
627 unsigned long start_jiffies = jiffies;
628
629 unsigned char r, v;
630 int fast, bulk, status;
631
632 v = cmd->cmnd[0];
633 bulk = ((v == READ_6) ||
634 (v == READ_10) || (v == WRITE_6) || (v == WRITE_10));
635
636 /*
637 * We only get here if the drive is ready to comunicate,
638 * hence no need for a full imm_wait.
639 */
640 w_ctr(ppb, 0x0c);
641 r = (r_str(ppb) & 0xb8);
642
643 /*
644 * while (device is not ready to send status byte)
645 * loop;
646 */
647 while (r != (unsigned char) 0xb8) {
648 /*
649 * If we have been running for more than a full timer tick
650 * then take a rest.
651 */
652 if (time_after(jiffies, start_jiffies + 1))
653 return 0;
654
655 /*
656 * FAIL if:
657 * a) Drive status is screwy (!ready && !present)
658 * b) Drive is requesting/sending more data than expected
659 */
660 if (((r & 0x88) != 0x88) || (cmd->SCp.this_residual <= 0)) {
661 imm_fail(dev, DID_ERROR);
662 return -1; /* ERROR_RETURN */
663 }
664 /* determine if we should use burst I/O */
665 if (dev->rd == 0) {
666 fast = (bulk
667 && (cmd->SCp.this_residual >=
668 IMM_BURST_SIZE)) ? IMM_BURST_SIZE : 2;
669 status = imm_out(dev, cmd->SCp.ptr, fast);
670 } else {
671 fast = (bulk
672 && (cmd->SCp.this_residual >=
673 IMM_BURST_SIZE)) ? IMM_BURST_SIZE : 1;
674 status = imm_in(dev, cmd->SCp.ptr, fast);
675 }
676
677 cmd->SCp.ptr += fast;
678 cmd->SCp.this_residual -= fast;
679
680 if (!status) {
681 imm_fail(dev, DID_BUS_BUSY);
682 return -1; /* ERROR_RETURN */
683 }
684 if (cmd->SCp.buffer && !cmd->SCp.this_residual) {
685 /* if scatter/gather, advance to the next segment */
686 if (cmd->SCp.buffers_residual--) {
687 cmd->SCp.buffer++;
688 cmd->SCp.this_residual =
689 cmd->SCp.buffer->length;
690 cmd->SCp.ptr = sg_virt(cmd->SCp.buffer);
691
692 /*
693 * Make sure that we transfer even number of bytes
694 * otherwise it makes imm_byte_out() messy.
695 */
696 if (cmd->SCp.this_residual & 0x01)
697 cmd->SCp.this_residual++;
698 }
699 }
700 /* Now check to see if the drive is ready to comunicate */
701 w_ctr(ppb, 0x0c);
702 r = (r_str(ppb) & 0xb8);
703
704 /* If not, drop back down to the scheduler and wait a timer tick */
705 if (!(r & 0x80))
706 return 0;
707 }
708 return 1; /* FINISH_RETURN */
709}
710
711/*
712 * Since the IMM itself doesn't generate interrupts, we use
713 * the scheduler's task queue to generate a stream of call-backs and
714 * complete the request when the drive is ready.
715 */
716static void imm_interrupt(struct work_struct *work)
717{
718 imm_struct *dev = container_of(work, imm_struct, imm_tq.work);
719 struct scsi_cmnd *cmd = dev->cur_cmd;
720 struct Scsi_Host *host = cmd->device->host;
721 unsigned long flags;
722
723 if (imm_engine(dev, cmd)) {
724 schedule_delayed_work(&dev->imm_tq, 1);
725 return;
726 }
727 /* Command must of completed hence it is safe to let go... */
728#if IMM_DEBUG > 0
729 switch ((cmd->result >> 16) & 0xff) {
730 case DID_OK:
731 break;
732 case DID_NO_CONNECT:
733 printk("imm: no device at SCSI ID %i\n", cmd->device->id);
734 break;
735 case DID_BUS_BUSY:
736 printk("imm: BUS BUSY - EPP timeout detected\n");
737 break;
738 case DID_TIME_OUT:
739 printk("imm: unknown timeout\n");
740 break;
741 case DID_ABORT:
742 printk("imm: told to abort\n");
743 break;
744 case DID_PARITY:
745 printk("imm: parity error (???)\n");
746 break;
747 case DID_ERROR:
748 printk("imm: internal driver error\n");
749 break;
750 case DID_RESET:
751 printk("imm: told to reset device\n");
752 break;
753 case DID_BAD_INTR:
754 printk("imm: bad interrupt (???)\n");
755 break;
756 default:
757 printk("imm: bad return code (%02x)\n",
758 (cmd->result >> 16) & 0xff);
759 }
760#endif
761
762 if (cmd->SCp.phase > 1)
763 imm_disconnect(dev);
764
765 imm_pb_dismiss(dev);
766
767 spin_lock_irqsave(host->host_lock, flags);
768 dev->cur_cmd = NULL;
769 cmd->scsi_done(cmd);
770 spin_unlock_irqrestore(host->host_lock, flags);
771 return;
772}
773
774static int imm_engine(imm_struct *dev, struct scsi_cmnd *cmd)
775{
776 unsigned short ppb = dev->base;
777 unsigned char l = 0, h = 0;
778 int retv, x;
779
780 /* First check for any errors that may have occurred
781 * Here we check for internal errors
782 */
783 if (dev->failed)
784 return 0;
785
786 switch (cmd->SCp.phase) {
787 case 0: /* Phase 0 - Waiting for parport */
788 if (time_after(jiffies, dev->jstart + HZ)) {
789 /*
790 * We waited more than a second
791 * for parport to call us
792 */
793 imm_fail(dev, DID_BUS_BUSY);
794 return 0;
795 }
796 return 1; /* wait until imm_wakeup claims parport */
797 /* Phase 1 - Connected */
798 case 1:
799 imm_connect(dev, CONNECT_EPP_MAYBE);
800 cmd->SCp.phase++;
801
802 /* Phase 2 - We are now talking to the scsi bus */
803 case 2:
804 if (!imm_select(dev, scmd_id(cmd))) {
805 imm_fail(dev, DID_NO_CONNECT);
806 return 0;
807 }
808 cmd->SCp.phase++;
809
810 /* Phase 3 - Ready to accept a command */
811 case 3:
812 w_ctr(ppb, 0x0c);
813 if (!(r_str(ppb) & 0x80))
814 return 1;
815
816 if (!imm_send_command(cmd))
817 return 0;
818 cmd->SCp.phase++;
819
820 /* Phase 4 - Setup scatter/gather buffers */
821 case 4:
822 if (scsi_bufflen(cmd)) {
823 cmd->SCp.buffer = scsi_sglist(cmd);
824 cmd->SCp.this_residual = cmd->SCp.buffer->length;
825 cmd->SCp.ptr = sg_virt(cmd->SCp.buffer);
826 } else {
827 cmd->SCp.buffer = NULL;
828 cmd->SCp.this_residual = 0;
829 cmd->SCp.ptr = NULL;
830 }
831 cmd->SCp.buffers_residual = scsi_sg_count(cmd) - 1;
832 cmd->SCp.phase++;
833 if (cmd->SCp.this_residual & 0x01)
834 cmd->SCp.this_residual++;
835 /* Phase 5 - Pre-Data transfer stage */
836 case 5:
837 /* Spin lock for BUSY */
838 w_ctr(ppb, 0x0c);
839 if (!(r_str(ppb) & 0x80))
840 return 1;
841
842 /* Require negotiation for read requests */
843 x = (r_str(ppb) & 0xb8);
844 dev->rd = (x & 0x10) ? 1 : 0;
845 dev->dp = (x & 0x20) ? 0 : 1;
846
847 if ((dev->dp) && (dev->rd))
848 if (imm_negotiate(dev))
849 return 0;
850 cmd->SCp.phase++;
851
852 /* Phase 6 - Data transfer stage */
853 case 6:
854 /* Spin lock for BUSY */
855 w_ctr(ppb, 0x0c);
856 if (!(r_str(ppb) & 0x80))
857 return 1;
858
859 if (dev->dp) {
860 retv = imm_completion(cmd);
861 if (retv == -1)
862 return 0;
863 if (retv == 0)
864 return 1;
865 }
866 cmd->SCp.phase++;
867
868 /* Phase 7 - Post data transfer stage */
869 case 7:
870 if ((dev->dp) && (dev->rd)) {
871 if ((dev->mode == IMM_NIBBLE) || (dev->mode == IMM_PS2)) {
872 w_ctr(ppb, 0x4);
873 w_ctr(ppb, 0xc);
874 w_ctr(ppb, 0xe);
875 w_ctr(ppb, 0x4);
876 }
877 }
878 cmd->SCp.phase++;
879
880 /* Phase 8 - Read status/message */
881 case 8:
882 /* Check for data overrun */
883 if (imm_wait(dev) != (unsigned char) 0xb8) {
884 imm_fail(dev, DID_ERROR);
885 return 0;
886 }
887 if (imm_negotiate(dev))
888 return 0;
889 if (imm_in(dev, &l, 1)) { /* read status byte */
890 /* Check for optional message byte */
891 if (imm_wait(dev) == (unsigned char) 0xb8)
892 imm_in(dev, &h, 1);
893 cmd->result = (DID_OK << 16) + (l & STATUS_MASK);
894 }
895 if ((dev->mode == IMM_NIBBLE) || (dev->mode == IMM_PS2)) {
896 w_ctr(ppb, 0x4);
897 w_ctr(ppb, 0xc);
898 w_ctr(ppb, 0xe);
899 w_ctr(ppb, 0x4);
900 }
901 return 0; /* Finished */
902 break;
903
904 default:
905 printk("imm: Invalid scsi phase\n");
906 }
907 return 0;
908}
909
910static int imm_queuecommand_lck(struct scsi_cmnd *cmd,
911 void (*done)(struct scsi_cmnd *))
912{
913 imm_struct *dev = imm_dev(cmd->device->host);
914
915 if (dev->cur_cmd) {
916 printk("IMM: bug in imm_queuecommand\n");
917 return 0;
918 }
919 dev->failed = 0;
920 dev->jstart = jiffies;
921 dev->cur_cmd = cmd;
922 cmd->scsi_done = done;
923 cmd->result = DID_ERROR << 16; /* default return code */
924 cmd->SCp.phase = 0; /* bus free */
925
926 schedule_delayed_work(&dev->imm_tq, 0);
927
928 imm_pb_claim(dev);
929
930 return 0;
931}
932
933static DEF_SCSI_QCMD(imm_queuecommand)
934
935/*
936 * Apparently the disk->capacity attribute is off by 1 sector
937 * for all disk drives. We add the one here, but it should really
938 * be done in sd.c. Even if it gets fixed there, this will still
939 * work.
940 */
941static int imm_biosparam(struct scsi_device *sdev, struct block_device *dev,
942 sector_t capacity, int ip[])
943{
944 ip[0] = 0x40;
945 ip[1] = 0x20;
946 ip[2] = ((unsigned long) capacity + 1) / (ip[0] * ip[1]);
947 if (ip[2] > 1024) {
948 ip[0] = 0xff;
949 ip[1] = 0x3f;
950 ip[2] = ((unsigned long) capacity + 1) / (ip[0] * ip[1]);
951 }
952 return 0;
953}
954
955static int imm_abort(struct scsi_cmnd *cmd)
956{
957 imm_struct *dev = imm_dev(cmd->device->host);
958 /*
959 * There is no method for aborting commands since Iomega
960 * have tied the SCSI_MESSAGE line high in the interface
961 */
962
963 switch (cmd->SCp.phase) {
964 case 0: /* Do not have access to parport */
965 case 1: /* Have not connected to interface */
966 dev->cur_cmd = NULL; /* Forget the problem */
967 return SUCCESS;
968 break;
969 default: /* SCSI command sent, can not abort */
970 return FAILED;
971 break;
972 }
973}
974
975static void imm_reset_pulse(unsigned int base)
976{
977 w_ctr(base, 0x04);
978 w_dtr(base, 0x40);
979 udelay(1);
980 w_ctr(base, 0x0c);
981 w_ctr(base, 0x0d);
982 udelay(50);
983 w_ctr(base, 0x0c);
984 w_ctr(base, 0x04);
985}
986
987static int imm_reset(struct scsi_cmnd *cmd)
988{
989 imm_struct *dev = imm_dev(cmd->device->host);
990
991 if (cmd->SCp.phase)
992 imm_disconnect(dev);
993 dev->cur_cmd = NULL; /* Forget the problem */
994
995 imm_connect(dev, CONNECT_NORMAL);
996 imm_reset_pulse(dev->base);
997 mdelay(1); /* device settle delay */
998 imm_disconnect(dev);
999 mdelay(1); /* device settle delay */
1000 return SUCCESS;
1001}
1002
1003static int device_check(imm_struct *dev)
1004{
1005 /* This routine looks for a device and then attempts to use EPP
1006 to send a command. If all goes as planned then EPP is available. */
1007
1008 static char cmd[6] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
1009 int loop, old_mode, status, k, ppb = dev->base;
1010 unsigned char l;
1011
1012 old_mode = dev->mode;
1013 for (loop = 0; loop < 8; loop++) {
1014 /* Attempt to use EPP for Test Unit Ready */
1015 if ((ppb & 0x0007) == 0x0000)
1016 dev->mode = IMM_EPP_32;
1017
1018 second_pass:
1019 imm_connect(dev, CONNECT_EPP_MAYBE);
1020 /* Select SCSI device */
1021 if (!imm_select(dev, loop)) {
1022 imm_disconnect(dev);
1023 continue;
1024 }
1025 printk("imm: Found device at ID %i, Attempting to use %s\n",
1026 loop, IMM_MODE_STRING[dev->mode]);
1027
1028 /* Send SCSI command */
1029 status = 1;
1030 w_ctr(ppb, 0x0c);
1031 for (l = 0; (l < 3) && (status); l++)
1032 status = imm_out(dev, &cmd[l << 1], 2);
1033
1034 if (!status) {
1035 imm_disconnect(dev);
1036 imm_connect(dev, CONNECT_EPP_MAYBE);
1037 imm_reset_pulse(dev->base);
1038 udelay(1000);
1039 imm_disconnect(dev);
1040 udelay(1000);
1041 if (dev->mode == IMM_EPP_32) {
1042 dev->mode = old_mode;
1043 goto second_pass;
1044 }
1045 printk("imm: Unable to establish communication\n");
1046 return -EIO;
1047 }
1048 w_ctr(ppb, 0x0c);
1049
1050 k = 1000000; /* 1 Second */
1051 do {
1052 l = r_str(ppb);
1053 k--;
1054 udelay(1);
1055 } while (!(l & 0x80) && (k));
1056
1057 l &= 0xb8;
1058
1059 if (l != 0xb8) {
1060 imm_disconnect(dev);
1061 imm_connect(dev, CONNECT_EPP_MAYBE);
1062 imm_reset_pulse(dev->base);
1063 udelay(1000);
1064 imm_disconnect(dev);
1065 udelay(1000);
1066 if (dev->mode == IMM_EPP_32) {
1067 dev->mode = old_mode;
1068 goto second_pass;
1069 }
1070 printk
1071 ("imm: Unable to establish communication\n");
1072 return -EIO;
1073 }
1074 imm_disconnect(dev);
1075 printk
1076 ("imm: Communication established at 0x%x with ID %i using %s\n",
1077 ppb, loop, IMM_MODE_STRING[dev->mode]);
1078 imm_connect(dev, CONNECT_EPP_MAYBE);
1079 imm_reset_pulse(dev->base);
1080 udelay(1000);
1081 imm_disconnect(dev);
1082 udelay(1000);
1083 return 0;
1084 }
1085 printk("imm: No devices found\n");
1086 return -ENODEV;
1087}
1088
1089/*
1090 * imm cannot deal with highmem, so this causes all IO pages for this host
1091 * to reside in low memory (hence mapped)
1092 */
1093static int imm_adjust_queue(struct scsi_device *device)
1094{
1095 blk_queue_bounce_limit(device->request_queue, BLK_BOUNCE_HIGH);
1096 return 0;
1097}
1098
1099static struct scsi_host_template imm_template = {
1100 .module = THIS_MODULE,
1101 .proc_name = "imm",
1102 .show_info = imm_show_info,
1103 .write_info = imm_write_info,
1104 .name = "Iomega VPI2 (imm) interface",
1105 .queuecommand = imm_queuecommand,
1106 .eh_abort_handler = imm_abort,
1107 .eh_bus_reset_handler = imm_reset,
1108 .eh_host_reset_handler = imm_reset,
1109 .bios_param = imm_biosparam,
1110 .this_id = 7,
1111 .sg_tablesize = SG_ALL,
1112 .cmd_per_lun = 1,
1113 .use_clustering = ENABLE_CLUSTERING,
1114 .can_queue = 1,
1115 .slave_alloc = imm_adjust_queue,
1116};
1117
1118/***************************************************************************
1119 * Parallel port probing routines *
1120 ***************************************************************************/
1121
1122static LIST_HEAD(imm_hosts);
1123
1124static int __imm_attach(struct parport *pb)
1125{
1126 struct Scsi_Host *host;
1127 imm_struct *dev;
1128 DECLARE_WAIT_QUEUE_HEAD_ONSTACK(waiting);
1129 DEFINE_WAIT(wait);
1130 int ports;
1131 int modes, ppb;
1132 int err = -ENOMEM;
1133
1134 init_waitqueue_head(&waiting);
1135
1136 dev = kzalloc(sizeof(imm_struct), GFP_KERNEL);
1137 if (!dev)
1138 return -ENOMEM;
1139
1140
1141 dev->base = -1;
1142 dev->mode = IMM_AUTODETECT;
1143 INIT_LIST_HEAD(&dev->list);
1144
1145 dev->dev = parport_register_device(pb, "imm", NULL, imm_wakeup,
1146 NULL, 0, dev);
1147
1148 if (!dev->dev)
1149 goto out;
1150
1151
1152 /* Claim the bus so it remembers what we do to the control
1153 * registers. [ CTR and ECP ]
1154 */
1155 err = -EBUSY;
1156 dev->waiting = &waiting;
1157 prepare_to_wait(&waiting, &wait, TASK_UNINTERRUPTIBLE);
1158 if (imm_pb_claim(dev))
1159 schedule_timeout(3 * HZ);
1160 if (dev->wanted) {
1161 printk(KERN_ERR "imm%d: failed to claim parport because "
1162 "a pardevice is owning the port for too long "
1163 "time!\n", pb->number);
1164 imm_pb_dismiss(dev);
1165 dev->waiting = NULL;
1166 finish_wait(&waiting, &wait);
1167 goto out1;
1168 }
1169 dev->waiting = NULL;
1170 finish_wait(&waiting, &wait);
1171 ppb = dev->base = dev->dev->port->base;
1172 dev->base_hi = dev->dev->port->base_hi;
1173 w_ctr(ppb, 0x0c);
1174 modes = dev->dev->port->modes;
1175
1176 /* Mode detection works up the chain of speed
1177 * This avoids a nasty if-then-else-if-... tree
1178 */
1179 dev->mode = IMM_NIBBLE;
1180
1181 if (modes & PARPORT_MODE_TRISTATE)
1182 dev->mode = IMM_PS2;
1183
1184 /* Done configuration */
1185
1186 err = imm_init(dev);
1187
1188 imm_pb_release(dev);
1189
1190 if (err)
1191 goto out1;
1192
1193 /* now the glue ... */
1194 if (dev->mode == IMM_NIBBLE || dev->mode == IMM_PS2)
1195 ports = 3;
1196 else
1197 ports = 8;
1198
1199 INIT_DELAYED_WORK(&dev->imm_tq, imm_interrupt);
1200
1201 err = -ENOMEM;
1202 host = scsi_host_alloc(&imm_template, sizeof(imm_struct *));
1203 if (!host)
1204 goto out1;
1205 host->io_port = pb->base;
1206 host->n_io_port = ports;
1207 host->dma_channel = -1;
1208 host->unique_id = pb->number;
1209 *(imm_struct **)&host->hostdata = dev;
1210 dev->host = host;
1211 list_add_tail(&dev->list, &imm_hosts);
1212 err = scsi_add_host(host, NULL);
1213 if (err)
1214 goto out2;
1215 scsi_scan_host(host);
1216 return 0;
1217
1218out2:
1219 list_del_init(&dev->list);
1220 scsi_host_put(host);
1221out1:
1222 parport_unregister_device(dev->dev);
1223out:
1224 kfree(dev);
1225 return err;
1226}
1227
1228static void imm_attach(struct parport *pb)
1229{
1230 __imm_attach(pb);
1231}
1232
1233static void imm_detach(struct parport *pb)
1234{
1235 imm_struct *dev;
1236 list_for_each_entry(dev, &imm_hosts, list) {
1237 if (dev->dev->port == pb) {
1238 list_del_init(&dev->list);
1239 scsi_remove_host(dev->host);
1240 scsi_host_put(dev->host);
1241 parport_unregister_device(dev->dev);
1242 kfree(dev);
1243 break;
1244 }
1245 }
1246}
1247
1248static struct parport_driver imm_driver = {
1249 .name = "imm",
1250 .attach = imm_attach,
1251 .detach = imm_detach,
1252};
1253
1254static int __init imm_driver_init(void)
1255{
1256 printk("imm: Version %s\n", IMM_VERSION);
1257 return parport_register_driver(&imm_driver);
1258}
1259
1260static void __exit imm_driver_exit(void)
1261{
1262 parport_unregister_driver(&imm_driver);
1263}
1264
1265module_init(imm_driver_init);
1266module_exit(imm_driver_exit);
1267
1268MODULE_LICENSE("GPL");