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11#include <linux/init.h>
12#include <linux/kernel.h>
13#include <linux/slab.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/jiffies.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
28static void ppa_reset_pulse(unsigned int base);
29
30typedef struct {
31 struct pardevice *dev;
32 int base;
33 int mode;
34 struct scsi_cmnd *cur_cmd;
35 struct delayed_work ppa_tq;
36 unsigned long jstart;
37 unsigned long recon_tmo;
38 unsigned int failed:1;
39 unsigned wanted:1;
40 unsigned int dev_no;
41 wait_queue_head_t *waiting;
42 struct Scsi_Host *host;
43 struct list_head list;
44} ppa_struct;
45
46#include "ppa.h"
47
48static inline ppa_struct *ppa_dev(struct Scsi_Host *host)
49{
50 return *(ppa_struct **)&host->hostdata;
51}
52
53static DEFINE_SPINLOCK(arbitration_lock);
54
55static void got_it(ppa_struct *dev)
56{
57 dev->base = dev->dev->port->base;
58 if (dev->cur_cmd)
59 dev->cur_cmd->SCp.phase = 1;
60 else
61 wake_up(dev->waiting);
62}
63
64static void ppa_wakeup(void *ref)
65{
66 ppa_struct *dev = (ppa_struct *) ref;
67 unsigned long flags;
68
69 spin_lock_irqsave(&arbitration_lock, flags);
70 if (dev->wanted) {
71 parport_claim(dev->dev);
72 got_it(dev);
73 dev->wanted = 0;
74 }
75 spin_unlock_irqrestore(&arbitration_lock, flags);
76 return;
77}
78
79static int ppa_pb_claim(ppa_struct *dev)
80{
81 unsigned long flags;
82 int res = 1;
83 spin_lock_irqsave(&arbitration_lock, flags);
84 if (parport_claim(dev->dev) == 0) {
85 got_it(dev);
86 res = 0;
87 }
88 dev->wanted = res;
89 spin_unlock_irqrestore(&arbitration_lock, flags);
90 return res;
91}
92
93static void ppa_pb_dismiss(ppa_struct *dev)
94{
95 unsigned long flags;
96 int wanted;
97 spin_lock_irqsave(&arbitration_lock, flags);
98 wanted = dev->wanted;
99 dev->wanted = 0;
100 spin_unlock_irqrestore(&arbitration_lock, flags);
101 if (!wanted)
102 parport_release(dev->dev);
103}
104
105static inline void ppa_pb_release(ppa_struct *dev)
106{
107 parport_release(dev->dev);
108}
109
110
111
112
113
114
115
116
117
118
119
120
121
122static inline int ppa_write_info(struct Scsi_Host *host, char *buffer, int length)
123{
124 ppa_struct *dev = ppa_dev(host);
125 unsigned long x;
126
127 if ((length > 5) && (strncmp(buffer, "mode=", 5) == 0)) {
128 x = simple_strtoul(buffer + 5, NULL, 0);
129 dev->mode = x;
130 return length;
131 }
132 if ((length > 10) && (strncmp(buffer, "recon_tmo=", 10) == 0)) {
133 x = simple_strtoul(buffer + 10, NULL, 0);
134 dev->recon_tmo = x;
135 printk(KERN_INFO "ppa: recon_tmo set to %ld\n", x);
136 return length;
137 }
138 printk(KERN_WARNING "ppa /proc: invalid variable\n");
139 return -EINVAL;
140}
141
142static int ppa_show_info(struct seq_file *m, struct Scsi_Host *host)
143{
144 ppa_struct *dev = ppa_dev(host);
145
146 seq_printf(m, "Version : %s\n", PPA_VERSION);
147 seq_printf(m, "Parport : %s\n", dev->dev->port->name);
148 seq_printf(m, "Mode : %s\n", PPA_MODE_STRING[dev->mode]);
149#if PPA_DEBUG > 0
150 seq_printf(m, "recon_tmo : %lu\n", dev->recon_tmo);
151#endif
152 return 0;
153}
154
155static int device_check(ppa_struct *dev);
156
157#if PPA_DEBUG > 0
158#define ppa_fail(x,y) printk("ppa: ppa_fail(%i) from %s at line %d\n",\
159 y, __func__, __LINE__); ppa_fail_func(x,y);
160static inline void ppa_fail_func(ppa_struct *dev, int error_code)
161#else
162static inline void ppa_fail(ppa_struct *dev, int error_code)
163#endif
164{
165
166 if (dev->cur_cmd) {
167 dev->cur_cmd->result = error_code << 16;
168 dev->failed = 1;
169 }
170}
171
172
173
174
175
176
177
178
179static unsigned char ppa_wait(ppa_struct *dev)
180{
181 int k;
182 unsigned short ppb = dev->base;
183 unsigned char r;
184
185 k = PPA_SPIN_TMO;
186
187 for (r = r_str(ppb); ((r & 0xc0) != 0xc0) && (k); k--) {
188 udelay(1);
189 r = r_str(ppb);
190 }
191
192
193
194
195
196
197
198
199 if (k)
200 return (r & 0xf0);
201
202
203 ppa_fail(dev, DID_TIME_OUT);
204 printk(KERN_WARNING "ppa timeout in ppa_wait\n");
205 return 0;
206}
207
208
209
210
211static inline void epp_reset(unsigned short ppb)
212{
213 int i;
214
215 i = r_str(ppb);
216 w_str(ppb, i);
217 w_str(ppb, i & 0xfe);
218}
219
220
221
222
223static inline void ecp_sync(ppa_struct *dev)
224{
225 int i, ppb_hi = dev->dev->port->base_hi;
226
227 if (ppb_hi == 0)
228 return;
229
230 if ((r_ecr(ppb_hi) & 0xe0) == 0x60) {
231 for (i = 0; i < 100; i++) {
232 if (r_ecr(ppb_hi) & 0x01)
233 return;
234 udelay(5);
235 }
236 printk(KERN_WARNING "ppa: ECP sync failed as data still present in FIFO.\n");
237 }
238}
239
240static int ppa_byte_out(unsigned short base, const char *buffer, int len)
241{
242 int i;
243
244 for (i = len; i; i--) {
245 w_dtr(base, *buffer++);
246 w_ctr(base, 0xe);
247 w_ctr(base, 0xc);
248 }
249 return 1;
250}
251
252static int ppa_byte_in(unsigned short base, char *buffer, int len)
253{
254 int i;
255
256 for (i = len; i; i--) {
257 *buffer++ = r_dtr(base);
258 w_ctr(base, 0x27);
259 w_ctr(base, 0x25);
260 }
261 return 1;
262}
263
264static int ppa_nibble_in(unsigned short base, char *buffer, int len)
265{
266 for (; len; len--) {
267 unsigned char h;
268
269 w_ctr(base, 0x4);
270 h = r_str(base) & 0xf0;
271 w_ctr(base, 0x6);
272 *buffer++ = h | ((r_str(base) & 0xf0) >> 4);
273 }
274 return 1;
275}
276
277static int ppa_out(ppa_struct *dev, char *buffer, int len)
278{
279 int r;
280 unsigned short ppb = dev->base;
281
282 r = ppa_wait(dev);
283
284 if ((r & 0x50) != 0x40) {
285 ppa_fail(dev, DID_ERROR);
286 return 0;
287 }
288 switch (dev->mode) {
289 case PPA_NIBBLE:
290 case PPA_PS2:
291
292 r = ppa_byte_out(ppb, buffer, len);
293 break;
294
295 case PPA_EPP_32:
296 case PPA_EPP_16:
297 case PPA_EPP_8:
298 epp_reset(ppb);
299 w_ctr(ppb, 0x4);
300#ifdef CONFIG_SCSI_IZIP_EPP16
301 if (!(((long) buffer | len) & 0x01))
302 outsw(ppb + 4, buffer, len >> 1);
303#else
304 if (!(((long) buffer | len) & 0x03))
305 outsl(ppb + 4, buffer, len >> 2);
306#endif
307 else
308 outsb(ppb + 4, buffer, len);
309 w_ctr(ppb, 0xc);
310 r = !(r_str(ppb) & 0x01);
311 w_ctr(ppb, 0xc);
312 ecp_sync(dev);
313 break;
314
315 default:
316 printk(KERN_ERR "PPA: bug in ppa_out()\n");
317 r = 0;
318 }
319 return r;
320}
321
322static int ppa_in(ppa_struct *dev, char *buffer, int len)
323{
324 int r;
325 unsigned short ppb = dev->base;
326
327 r = ppa_wait(dev);
328
329 if ((r & 0x50) != 0x50) {
330 ppa_fail(dev, DID_ERROR);
331 return 0;
332 }
333 switch (dev->mode) {
334 case PPA_NIBBLE:
335
336 r = ppa_nibble_in(ppb, buffer, len);
337 w_ctr(ppb, 0xc);
338 break;
339
340 case PPA_PS2:
341
342 w_ctr(ppb, 0x25);
343 r = ppa_byte_in(ppb, buffer, len);
344 w_ctr(ppb, 0x4);
345 w_ctr(ppb, 0xc);
346 break;
347
348 case PPA_EPP_32:
349 case PPA_EPP_16:
350 case PPA_EPP_8:
351 epp_reset(ppb);
352 w_ctr(ppb, 0x24);
353#ifdef CONFIG_SCSI_IZIP_EPP16
354 if (!(((long) buffer | len) & 0x01))
355 insw(ppb + 4, buffer, len >> 1);
356#else
357 if (!(((long) buffer | len) & 0x03))
358 insl(ppb + 4, buffer, len >> 2);
359#endif
360 else
361 insb(ppb + 4, buffer, len);
362 w_ctr(ppb, 0x2c);
363 r = !(r_str(ppb) & 0x01);
364 w_ctr(ppb, 0x2c);
365 ecp_sync(dev);
366 break;
367
368 default:
369 printk(KERN_ERR "PPA: bug in ppa_ins()\n");
370 r = 0;
371 break;
372 }
373 return r;
374}
375
376
377static inline void ppa_d_pulse(unsigned short ppb, unsigned char b)
378{
379 w_dtr(ppb, b);
380 w_ctr(ppb, 0xc);
381 w_ctr(ppb, 0xe);
382 w_ctr(ppb, 0xc);
383 w_ctr(ppb, 0x4);
384 w_ctr(ppb, 0xc);
385}
386
387static void ppa_disconnect(ppa_struct *dev)
388{
389 unsigned short ppb = dev->base;
390
391 ppa_d_pulse(ppb, 0);
392 ppa_d_pulse(ppb, 0x3c);
393 ppa_d_pulse(ppb, 0x20);
394 ppa_d_pulse(ppb, 0xf);
395}
396
397static inline void ppa_c_pulse(unsigned short ppb, unsigned char b)
398{
399 w_dtr(ppb, b);
400 w_ctr(ppb, 0x4);
401 w_ctr(ppb, 0x6);
402 w_ctr(ppb, 0x4);
403 w_ctr(ppb, 0xc);
404}
405
406static inline void ppa_connect(ppa_struct *dev, int flag)
407{
408 unsigned short ppb = dev->base;
409
410 ppa_c_pulse(ppb, 0);
411 ppa_c_pulse(ppb, 0x3c);
412 ppa_c_pulse(ppb, 0x20);
413 if ((flag == CONNECT_EPP_MAYBE) && IN_EPP_MODE(dev->mode))
414 ppa_c_pulse(ppb, 0xcf);
415 else
416 ppa_c_pulse(ppb, 0x8f);
417}
418
419static int ppa_select(ppa_struct *dev, int target)
420{
421 int k;
422 unsigned short ppb = dev->base;
423
424
425
426
427
428 k = PPA_SELECT_TMO;
429 do {
430 k--;
431 udelay(1);
432 } while ((r_str(ppb) & 0x40) && (k));
433 if (!k)
434 return 0;
435
436 w_dtr(ppb, (1 << target));
437 w_ctr(ppb, 0xe);
438 w_ctr(ppb, 0xc);
439 w_dtr(ppb, 0x80);
440 w_ctr(ppb, 0x8);
441
442 k = PPA_SELECT_TMO;
443 do {
444 k--;
445 udelay(1);
446 }
447 while (!(r_str(ppb) & 0x40) && (k));
448 if (!k)
449 return 0;
450
451 return 1;
452}
453
454
455
456
457
458
459
460
461
462
463static int ppa_init(ppa_struct *dev)
464{
465 int retv;
466 unsigned short ppb = dev->base;
467
468 ppa_disconnect(dev);
469 ppa_connect(dev, CONNECT_NORMAL);
470
471 retv = 2;
472
473 w_ctr(ppb, 0xe);
474 if ((r_str(ppb) & 0x08) == 0x08)
475 retv--;
476
477 w_ctr(ppb, 0xc);
478 if ((r_str(ppb) & 0x08) == 0x00)
479 retv--;
480
481 if (!retv)
482 ppa_reset_pulse(ppb);
483 udelay(1000);
484 ppa_disconnect(dev);
485 udelay(1000);
486
487 if (retv)
488 return -EIO;
489
490 return device_check(dev);
491}
492
493static inline int ppa_send_command(struct scsi_cmnd *cmd)
494{
495 ppa_struct *dev = ppa_dev(cmd->device->host);
496 int k;
497
498 w_ctr(dev->base, 0x0c);
499
500 for (k = 0; k < cmd->cmd_len; k++)
501 if (!ppa_out(dev, &cmd->cmnd[k], 1))
502 return 0;
503 return 1;
504}
505
506
507
508
509
510
511
512
513
514static int ppa_completion(struct scsi_cmnd *cmd)
515{
516
517
518
519
520
521 ppa_struct *dev = ppa_dev(cmd->device->host);
522 unsigned short ppb = dev->base;
523 unsigned long start_jiffies = jiffies;
524
525 unsigned char r, v;
526 int fast, bulk, status;
527
528 v = cmd->cmnd[0];
529 bulk = ((v == READ_6) ||
530 (v == READ_10) || (v == WRITE_6) || (v == WRITE_10));
531
532
533
534
535
536 r = (r_str(ppb) & 0xf0);
537
538 while (r != (unsigned char) 0xf0) {
539
540
541
542
543 if (time_after(jiffies, start_jiffies + 1))
544 return 0;
545
546 if ((cmd->SCp.this_residual <= 0)) {
547 ppa_fail(dev, DID_ERROR);
548 return -1;
549 }
550
551
552
553
554
555
556
557
558
559
560
561 if ((r & 0xc0) != 0xc0) {
562
563
564
565 unsigned long k = dev->recon_tmo;
566 for (; k && ((r = (r_str(ppb) & 0xf0)) & 0xc0) != 0xc0;
567 k--)
568 udelay(1);
569
570 if (!k)
571 return 0;
572 }
573
574
575 fast = (bulk && (cmd->SCp.this_residual >= PPA_BURST_SIZE))
576 ? PPA_BURST_SIZE : 1;
577
578 if (r == (unsigned char) 0xc0)
579 status = ppa_out(dev, cmd->SCp.ptr, fast);
580 else
581 status = ppa_in(dev, cmd->SCp.ptr, fast);
582
583 cmd->SCp.ptr += fast;
584 cmd->SCp.this_residual -= fast;
585
586 if (!status) {
587 ppa_fail(dev, DID_BUS_BUSY);
588 return -1;
589 }
590 if (cmd->SCp.buffer && !cmd->SCp.this_residual) {
591
592 if (cmd->SCp.buffers_residual--) {
593 cmd->SCp.buffer = sg_next(cmd->SCp.buffer);
594 cmd->SCp.this_residual =
595 cmd->SCp.buffer->length;
596 cmd->SCp.ptr = sg_virt(cmd->SCp.buffer);
597 }
598 }
599
600 r = (r_str(ppb) & 0xf0);
601
602 if (!(r & 0x80))
603 return 0;
604 }
605 return 1;
606}
607
608
609
610
611
612
613static void ppa_interrupt(struct work_struct *work)
614{
615 ppa_struct *dev = container_of(work, ppa_struct, ppa_tq.work);
616 struct scsi_cmnd *cmd = dev->cur_cmd;
617
618 if (!cmd) {
619 printk(KERN_ERR "PPA: bug in ppa_interrupt\n");
620 return;
621 }
622 if (ppa_engine(dev, cmd)) {
623 schedule_delayed_work(&dev->ppa_tq, 1);
624 return;
625 }
626
627#if PPA_DEBUG > 0
628 switch ((cmd->result >> 16) & 0xff) {
629 case DID_OK:
630 break;
631 case DID_NO_CONNECT:
632 printk(KERN_DEBUG "ppa: no device at SCSI ID %i\n", cmd->device->target);
633 break;
634 case DID_BUS_BUSY:
635 printk(KERN_DEBUG "ppa: BUS BUSY - EPP timeout detected\n");
636 break;
637 case DID_TIME_OUT:
638 printk(KERN_DEBUG "ppa: unknown timeout\n");
639 break;
640 case DID_ABORT:
641 printk(KERN_DEBUG "ppa: told to abort\n");
642 break;
643 case DID_PARITY:
644 printk(KERN_DEBUG "ppa: parity error (???)\n");
645 break;
646 case DID_ERROR:
647 printk(KERN_DEBUG "ppa: internal driver error\n");
648 break;
649 case DID_RESET:
650 printk(KERN_DEBUG "ppa: told to reset device\n");
651 break;
652 case DID_BAD_INTR:
653 printk(KERN_WARNING "ppa: bad interrupt (???)\n");
654 break;
655 default:
656 printk(KERN_WARNING "ppa: bad return code (%02x)\n",
657 (cmd->result >> 16) & 0xff);
658 }
659#endif
660
661 if (cmd->SCp.phase > 1)
662 ppa_disconnect(dev);
663
664 ppa_pb_dismiss(dev);
665
666 dev->cur_cmd = NULL;
667
668 cmd->scsi_done(cmd);
669}
670
671static int ppa_engine(ppa_struct *dev, struct scsi_cmnd *cmd)
672{
673 unsigned short ppb = dev->base;
674 unsigned char l = 0, h = 0;
675 int retv;
676
677
678
679
680 if (dev->failed)
681 return 0;
682
683 switch (cmd->SCp.phase) {
684 case 0:
685 if (time_after(jiffies, dev->jstart + HZ)) {
686
687
688
689
690 ppa_fail(dev, DID_BUS_BUSY);
691 return 0;
692 }
693 return 1;
694 case 1:
695 {
696 int retv = 2;
697
698 ppa_connect(dev, CONNECT_EPP_MAYBE);
699
700 w_ctr(ppb, 0xe);
701 if ((r_str(ppb) & 0x08) == 0x08)
702 retv--;
703
704 w_ctr(ppb, 0xc);
705 if ((r_str(ppb) & 0x08) == 0x00)
706 retv--;
707
708 if (retv) {
709 if (time_after(jiffies, dev->jstart + (1 * HZ))) {
710 printk(KERN_ERR "ppa: Parallel port cable is unplugged.\n");
711 ppa_fail(dev, DID_BUS_BUSY);
712 return 0;
713 } else {
714 ppa_disconnect(dev);
715 return 1;
716 }
717 }
718 cmd->SCp.phase++;
719 }
720 fallthrough;
721
722 case 2:
723 if (!ppa_select(dev, scmd_id(cmd))) {
724 ppa_fail(dev, DID_NO_CONNECT);
725 return 0;
726 }
727 cmd->SCp.phase++;
728 fallthrough;
729
730 case 3:
731 w_ctr(ppb, 0x0c);
732 if (!(r_str(ppb) & 0x80))
733 return 1;
734
735 if (!ppa_send_command(cmd))
736 return 0;
737 cmd->SCp.phase++;
738 fallthrough;
739
740 case 4:
741 if (scsi_bufflen(cmd)) {
742 cmd->SCp.buffer = scsi_sglist(cmd);
743 cmd->SCp.this_residual = cmd->SCp.buffer->length;
744 cmd->SCp.ptr = sg_virt(cmd->SCp.buffer);
745 } else {
746 cmd->SCp.buffer = NULL;
747 cmd->SCp.this_residual = 0;
748 cmd->SCp.ptr = NULL;
749 }
750 cmd->SCp.buffers_residual = scsi_sg_count(cmd) - 1;
751 cmd->SCp.phase++;
752 fallthrough;
753
754 case 5:
755 w_ctr(ppb, 0x0c);
756 if (!(r_str(ppb) & 0x80))
757 return 1;
758
759 retv = ppa_completion(cmd);
760 if (retv == -1)
761 return 0;
762 if (retv == 0)
763 return 1;
764 cmd->SCp.phase++;
765 fallthrough;
766
767 case 6:
768 cmd->result = DID_OK << 16;
769
770 if (ppa_wait(dev) != (unsigned char) 0xf0) {
771 ppa_fail(dev, DID_ERROR);
772 return 0;
773 }
774 if (ppa_in(dev, &l, 1)) {
775
776 if (ppa_wait(dev) == (unsigned char) 0xf0)
777 ppa_in(dev, &h, 1);
778 cmd->result =
779 (DID_OK << 16) + (h << 8) + (l & STATUS_MASK);
780 }
781 return 0;
782
783 default:
784 printk(KERN_ERR "ppa: Invalid scsi phase\n");
785 }
786 return 0;
787}
788
789static int ppa_queuecommand_lck(struct scsi_cmnd *cmd,
790 void (*done) (struct scsi_cmnd *))
791{
792 ppa_struct *dev = ppa_dev(cmd->device->host);
793
794 if (dev->cur_cmd) {
795 printk(KERN_ERR "PPA: bug in ppa_queuecommand\n");
796 return 0;
797 }
798 dev->failed = 0;
799 dev->jstart = jiffies;
800 dev->cur_cmd = cmd;
801 cmd->scsi_done = done;
802 cmd->result = DID_ERROR << 16;
803 cmd->SCp.phase = 0;
804
805 schedule_delayed_work(&dev->ppa_tq, 0);
806
807 ppa_pb_claim(dev);
808
809 return 0;
810}
811
812static DEF_SCSI_QCMD(ppa_queuecommand)
813
814
815
816
817
818
819
820static int ppa_biosparam(struct scsi_device *sdev, struct block_device *dev,
821 sector_t capacity, int ip[])
822{
823 ip[0] = 0x40;
824 ip[1] = 0x20;
825 ip[2] = ((unsigned long) capacity + 1) / (ip[0] * ip[1]);
826 if (ip[2] > 1024) {
827 ip[0] = 0xff;
828 ip[1] = 0x3f;
829 ip[2] = ((unsigned long) capacity + 1) / (ip[0] * ip[1]);
830 if (ip[2] > 1023)
831 ip[2] = 1023;
832 }
833 return 0;
834}
835
836static int ppa_abort(struct scsi_cmnd *cmd)
837{
838 ppa_struct *dev = ppa_dev(cmd->device->host);
839
840
841
842
843
844 switch (cmd->SCp.phase) {
845 case 0:
846 case 1:
847 dev->cur_cmd = NULL;
848 return SUCCESS;
849 default:
850 return FAILED;
851 }
852}
853
854static void ppa_reset_pulse(unsigned int base)
855{
856 w_dtr(base, 0x40);
857 w_ctr(base, 0x8);
858 udelay(30);
859 w_ctr(base, 0xc);
860}
861
862static int ppa_reset(struct scsi_cmnd *cmd)
863{
864 ppa_struct *dev = ppa_dev(cmd->device->host);
865
866 if (cmd->SCp.phase)
867 ppa_disconnect(dev);
868 dev->cur_cmd = NULL;
869
870 ppa_connect(dev, CONNECT_NORMAL);
871 ppa_reset_pulse(dev->base);
872 mdelay(1);
873 ppa_disconnect(dev);
874 mdelay(1);
875 return SUCCESS;
876}
877
878static int device_check(ppa_struct *dev)
879{
880
881
882
883 static u8 cmd[6] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
884 int loop, old_mode, status, k, ppb = dev->base;
885 unsigned char l;
886
887 old_mode = dev->mode;
888 for (loop = 0; loop < 8; loop++) {
889
890 if ((ppb & 0x0007) == 0x0000)
891 dev->mode = PPA_EPP_32;
892
893second_pass:
894 ppa_connect(dev, CONNECT_EPP_MAYBE);
895
896 if (!ppa_select(dev, loop)) {
897 ppa_disconnect(dev);
898 continue;
899 }
900 printk(KERN_INFO "ppa: Found device at ID %i, Attempting to use %s\n",
901 loop, PPA_MODE_STRING[dev->mode]);
902
903
904 status = 1;
905 w_ctr(ppb, 0x0c);
906 for (l = 0; (l < 6) && (status); l++)
907 status = ppa_out(dev, cmd, 1);
908
909 if (!status) {
910 ppa_disconnect(dev);
911 ppa_connect(dev, CONNECT_EPP_MAYBE);
912 w_dtr(ppb, 0x40);
913 w_ctr(ppb, 0x08);
914 udelay(30);
915 w_ctr(ppb, 0x0c);
916 udelay(1000);
917 ppa_disconnect(dev);
918 udelay(1000);
919 if (dev->mode == PPA_EPP_32) {
920 dev->mode = old_mode;
921 goto second_pass;
922 }
923 return -EIO;
924 }
925 w_ctr(ppb, 0x0c);
926 k = 1000000;
927 do {
928 l = r_str(ppb);
929 k--;
930 udelay(1);
931 } while (!(l & 0x80) && (k));
932
933 l &= 0xf0;
934
935 if (l != 0xf0) {
936 ppa_disconnect(dev);
937 ppa_connect(dev, CONNECT_EPP_MAYBE);
938 ppa_reset_pulse(ppb);
939 udelay(1000);
940 ppa_disconnect(dev);
941 udelay(1000);
942 if (dev->mode == PPA_EPP_32) {
943 dev->mode = old_mode;
944 goto second_pass;
945 }
946 return -EIO;
947 }
948 ppa_disconnect(dev);
949 printk(KERN_INFO "ppa: Communication established with ID %i using %s\n",
950 loop, PPA_MODE_STRING[dev->mode]);
951 ppa_connect(dev, CONNECT_EPP_MAYBE);
952 ppa_reset_pulse(ppb);
953 udelay(1000);
954 ppa_disconnect(dev);
955 udelay(1000);
956 return 0;
957 }
958 return -ENODEV;
959}
960
961static int ppa_adjust_queue(struct scsi_device *device)
962{
963 blk_queue_bounce_limit(device->request_queue, BLK_BOUNCE_HIGH);
964 return 0;
965}
966
967static struct scsi_host_template ppa_template = {
968 .module = THIS_MODULE,
969 .proc_name = "ppa",
970 .show_info = ppa_show_info,
971 .write_info = ppa_write_info,
972 .name = "Iomega VPI0 (ppa) interface",
973 .queuecommand = ppa_queuecommand,
974 .eh_abort_handler = ppa_abort,
975 .eh_host_reset_handler = ppa_reset,
976 .bios_param = ppa_biosparam,
977 .this_id = -1,
978 .sg_tablesize = SG_ALL,
979 .can_queue = 1,
980 .slave_alloc = ppa_adjust_queue,
981};
982
983
984
985
986
987static LIST_HEAD(ppa_hosts);
988
989
990
991
992
993
994
995static inline ppa_struct *find_parent(void)
996{
997 ppa_struct *dev, *par = NULL;
998 unsigned int cnt = 0;
999
1000 if (list_empty(&ppa_hosts))
1001 return NULL;
1002
1003 list_for_each_entry(dev, &ppa_hosts, list) {
1004 if (dev->dev_no != cnt)
1005 return par;
1006 cnt++;
1007 par = dev;
1008 }
1009
1010 return par;
1011}
1012
1013static int __ppa_attach(struct parport *pb)
1014{
1015 struct Scsi_Host *host;
1016 DECLARE_WAIT_QUEUE_HEAD_ONSTACK(waiting);
1017 DEFINE_WAIT(wait);
1018 ppa_struct *dev, *temp;
1019 int ports;
1020 int modes, ppb, ppb_hi;
1021 int err = -ENOMEM;
1022 struct pardev_cb ppa_cb;
1023
1024 dev = kzalloc(sizeof(ppa_struct), GFP_KERNEL);
1025 if (!dev)
1026 return -ENOMEM;
1027 dev->base = -1;
1028 dev->mode = PPA_AUTODETECT;
1029 dev->recon_tmo = PPA_RECON_TMO;
1030 init_waitqueue_head(&waiting);
1031 temp = find_parent();
1032 if (temp)
1033 dev->dev_no = temp->dev_no + 1;
1034
1035 memset(&ppa_cb, 0, sizeof(ppa_cb));
1036 ppa_cb.private = dev;
1037 ppa_cb.wakeup = ppa_wakeup;
1038
1039 dev->dev = parport_register_dev_model(pb, "ppa", &ppa_cb, dev->dev_no);
1040
1041 if (!dev->dev)
1042 goto out;
1043
1044
1045
1046
1047 err = -EBUSY;
1048 dev->waiting = &waiting;
1049 prepare_to_wait(&waiting, &wait, TASK_UNINTERRUPTIBLE);
1050 if (ppa_pb_claim(dev))
1051 schedule_timeout(3 * HZ);
1052 if (dev->wanted) {
1053 printk(KERN_ERR "ppa%d: failed to claim parport because "
1054 "a pardevice is owning the port for too long "
1055 "time!\n", pb->number);
1056 ppa_pb_dismiss(dev);
1057 dev->waiting = NULL;
1058 finish_wait(&waiting, &wait);
1059 goto out1;
1060 }
1061 dev->waiting = NULL;
1062 finish_wait(&waiting, &wait);
1063 ppb = dev->base = dev->dev->port->base;
1064 ppb_hi = dev->dev->port->base_hi;
1065 w_ctr(ppb, 0x0c);
1066 modes = dev->dev->port->modes;
1067
1068
1069
1070
1071 dev->mode = PPA_NIBBLE;
1072
1073 if (modes & PARPORT_MODE_TRISTATE)
1074 dev->mode = PPA_PS2;
1075
1076 if (modes & PARPORT_MODE_ECP) {
1077 w_ecr(ppb_hi, 0x20);
1078 dev->mode = PPA_PS2;
1079 }
1080 if ((modes & PARPORT_MODE_EPP) && (modes & PARPORT_MODE_ECP))
1081 w_ecr(ppb_hi, 0x80);
1082
1083
1084
1085 err = ppa_init(dev);
1086 ppa_pb_release(dev);
1087
1088 if (err)
1089 goto out1;
1090
1091
1092 if (dev->mode == PPA_NIBBLE || dev->mode == PPA_PS2)
1093 ports = 3;
1094 else
1095 ports = 8;
1096
1097 INIT_DELAYED_WORK(&dev->ppa_tq, ppa_interrupt);
1098
1099 err = -ENOMEM;
1100 host = scsi_host_alloc(&ppa_template, sizeof(ppa_struct *));
1101 if (!host)
1102 goto out1;
1103 host->io_port = pb->base;
1104 host->n_io_port = ports;
1105 host->dma_channel = -1;
1106 host->unique_id = pb->number;
1107 *(ppa_struct **)&host->hostdata = dev;
1108 dev->host = host;
1109 list_add_tail(&dev->list, &ppa_hosts);
1110 err = scsi_add_host(host, NULL);
1111 if (err)
1112 goto out2;
1113 scsi_scan_host(host);
1114 return 0;
1115out2:
1116 list_del_init(&dev->list);
1117 scsi_host_put(host);
1118out1:
1119 parport_unregister_device(dev->dev);
1120out:
1121 kfree(dev);
1122 return err;
1123}
1124
1125static void ppa_attach(struct parport *pb)
1126{
1127 __ppa_attach(pb);
1128}
1129
1130static void ppa_detach(struct parport *pb)
1131{
1132 ppa_struct *dev;
1133 list_for_each_entry(dev, &ppa_hosts, list) {
1134 if (dev->dev->port == pb) {
1135 list_del_init(&dev->list);
1136 scsi_remove_host(dev->host);
1137 scsi_host_put(dev->host);
1138 parport_unregister_device(dev->dev);
1139 kfree(dev);
1140 break;
1141 }
1142 }
1143}
1144
1145static struct parport_driver ppa_driver = {
1146 .name = "ppa",
1147 .match_port = ppa_attach,
1148 .detach = ppa_detach,
1149 .devmodel = true,
1150};
1151module_parport_driver(ppa_driver);
1152
1153MODULE_LICENSE("GPL");
1154