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1/* ppa.c -- low level driver for the IOMEGA PPA3
2 * parallel port SCSI host adapter.
3 *
4 * (The PPA3 is the embedded controller in the ZIP drive.)
5 *
6 * (c) 1995,1996 Grant R. Guenther, grant@torque.net,
7 * under the terms of the GNU General Public License.
8 *
9 */
10
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; /* Parport device entry */
32 int base; /* Actual port address */
33 int mode; /* Transfer mode */
34 struct scsi_cmnd *cur_cmd; /* Current queued command */
35 struct delayed_work ppa_tq; /* Polling interrupt stuff */
36 unsigned long jstart; /* Jiffies at start */
37 unsigned long recon_tmo; /* How many usecs to wait for reconnection (6th bit) */
38 unsigned int failed:1; /* Failure flag */
39 unsigned wanted:1; /* Parport sharing busy flag */
40 wait_queue_head_t *waiting;
41 struct Scsi_Host *host;
42 struct list_head list;
43} ppa_struct;
44
45#include "ppa.h"
46
47static inline ppa_struct *ppa_dev(struct Scsi_Host *host)
48{
49 return *(ppa_struct **)&host->hostdata;
50}
51
52static DEFINE_SPINLOCK(arbitration_lock);
53
54static void got_it(ppa_struct *dev)
55{
56 dev->base = dev->dev->port->base;
57 if (dev->cur_cmd)
58 dev->cur_cmd->SCp.phase = 1;
59 else
60 wake_up(dev->waiting);
61}
62
63static void ppa_wakeup(void *ref)
64{
65 ppa_struct *dev = (ppa_struct *) ref;
66 unsigned long flags;
67
68 spin_lock_irqsave(&arbitration_lock, flags);
69 if (dev->wanted) {
70 parport_claim(dev->dev);
71 got_it(dev);
72 dev->wanted = 0;
73 }
74 spin_unlock_irqrestore(&arbitration_lock, flags);
75 return;
76}
77
78static int ppa_pb_claim(ppa_struct *dev)
79{
80 unsigned long flags;
81 int res = 1;
82 spin_lock_irqsave(&arbitration_lock, flags);
83 if (parport_claim(dev->dev) == 0) {
84 got_it(dev);
85 res = 0;
86 }
87 dev->wanted = res;
88 spin_unlock_irqrestore(&arbitration_lock, flags);
89 return res;
90}
91
92static void ppa_pb_dismiss(ppa_struct *dev)
93{
94 unsigned long flags;
95 int wanted;
96 spin_lock_irqsave(&arbitration_lock, flags);
97 wanted = dev->wanted;
98 dev->wanted = 0;
99 spin_unlock_irqrestore(&arbitration_lock, flags);
100 if (!wanted)
101 parport_release(dev->dev);
102}
103
104static inline void ppa_pb_release(ppa_struct *dev)
105{
106 parport_release(dev->dev);
107}
108
109/*
110 * Start of Chipset kludges
111 */
112
113/* This is to give the ppa driver a way to modify the timings (and other
114 * parameters) by writing to the /proc/scsi/ppa/0 file.
115 * Very simple method really... (To simple, no error checking :( )
116 * Reason: Kernel hackers HATE having to unload and reload modules for
117 * testing...
118 * Also gives a method to use a script to obtain optimum timings (TODO)
119 */
120
121static inline int ppa_proc_write(ppa_struct *dev, char *buffer, int length)
122{
123 unsigned long x;
124
125 if ((length > 5) && (strncmp(buffer, "mode=", 5) == 0)) {
126 x = simple_strtoul(buffer + 5, NULL, 0);
127 dev->mode = x;
128 return length;
129 }
130 if ((length > 10) && (strncmp(buffer, "recon_tmo=", 10) == 0)) {
131 x = simple_strtoul(buffer + 10, NULL, 0);
132 dev->recon_tmo = x;
133 printk(KERN_INFO "ppa: recon_tmo set to %ld\n", x);
134 return length;
135 }
136 printk(KERN_WARNING "ppa /proc: invalid variable\n");
137 return -EINVAL;
138}
139
140static int ppa_proc_info(struct Scsi_Host *host, char *buffer, char **start, off_t offset, int length, int inout)
141{
142 int len = 0;
143 ppa_struct *dev = ppa_dev(host);
144
145 if (inout)
146 return ppa_proc_write(dev, buffer, length);
147
148 len += sprintf(buffer + len, "Version : %s\n", PPA_VERSION);
149 len +=
150 sprintf(buffer + len, "Parport : %s\n",
151 dev->dev->port->name);
152 len +=
153 sprintf(buffer + len, "Mode : %s\n",
154 PPA_MODE_STRING[dev->mode]);
155#if PPA_DEBUG > 0
156 len +=
157 sprintf(buffer + len, "recon_tmo : %lu\n", dev->recon_tmo);
158#endif
159
160 /* Request for beyond end of buffer */
161 if (offset > length)
162 return 0;
163
164 *start = buffer + offset;
165 len -= offset;
166 if (len > length)
167 len = length;
168 return len;
169}
170
171static int device_check(ppa_struct *dev);
172
173#if PPA_DEBUG > 0
174#define ppa_fail(x,y) printk("ppa: ppa_fail(%i) from %s at line %d\n",\
175 y, __func__, __LINE__); ppa_fail_func(x,y);
176static inline void ppa_fail_func(ppa_struct *dev, int error_code)
177#else
178static inline void ppa_fail(ppa_struct *dev, int error_code)
179#endif
180{
181 /* If we fail a device then we trash status / message bytes */
182 if (dev->cur_cmd) {
183 dev->cur_cmd->result = error_code << 16;
184 dev->failed = 1;
185 }
186}
187
188/*
189 * Wait for the high bit to be set.
190 *
191 * In principle, this could be tied to an interrupt, but the adapter
192 * doesn't appear to be designed to support interrupts. We spin on
193 * the 0x80 ready bit.
194 */
195static unsigned char ppa_wait(ppa_struct *dev)
196{
197 int k;
198 unsigned short ppb = dev->base;
199 unsigned char r;
200
201 k = PPA_SPIN_TMO;
202 /* Wait for bit 6 and 7 - PJC */
203 for (r = r_str(ppb); ((r & 0xc0) != 0xc0) && (k); k--) {
204 udelay(1);
205 r = r_str(ppb);
206 }
207
208 /*
209 * return some status information.
210 * Semantics: 0xc0 = ZIP wants more data
211 * 0xd0 = ZIP wants to send more data
212 * 0xe0 = ZIP is expecting SCSI command data
213 * 0xf0 = end of transfer, ZIP is sending status
214 */
215 if (k)
216 return (r & 0xf0);
217
218 /* Counter expired - Time out occurred */
219 ppa_fail(dev, DID_TIME_OUT);
220 printk(KERN_WARNING "ppa timeout in ppa_wait\n");
221 return 0; /* command timed out */
222}
223
224/*
225 * Clear EPP Timeout Bit
226 */
227static inline void epp_reset(unsigned short ppb)
228{
229 int i;
230
231 i = r_str(ppb);
232 w_str(ppb, i);
233 w_str(ppb, i & 0xfe);
234}
235
236/*
237 * Wait for empty ECP fifo (if we are in ECP fifo mode only)
238 */
239static inline void ecp_sync(ppa_struct *dev)
240{
241 int i, ppb_hi = dev->dev->port->base_hi;
242
243 if (ppb_hi == 0)
244 return;
245
246 if ((r_ecr(ppb_hi) & 0xe0) == 0x60) { /* mode 011 == ECP fifo mode */
247 for (i = 0; i < 100; i++) {
248 if (r_ecr(ppb_hi) & 0x01)
249 return;
250 udelay(5);
251 }
252 printk(KERN_WARNING "ppa: ECP sync failed as data still present in FIFO.\n");
253 }
254}
255
256static int ppa_byte_out(unsigned short base, const char *buffer, int len)
257{
258 int i;
259
260 for (i = len; i; i--) {
261 w_dtr(base, *buffer++);
262 w_ctr(base, 0xe);
263 w_ctr(base, 0xc);
264 }
265 return 1; /* All went well - we hope! */
266}
267
268static int ppa_byte_in(unsigned short base, char *buffer, int len)
269{
270 int i;
271
272 for (i = len; i; i--) {
273 *buffer++ = r_dtr(base);
274 w_ctr(base, 0x27);
275 w_ctr(base, 0x25);
276 }
277 return 1; /* All went well - we hope! */
278}
279
280static int ppa_nibble_in(unsigned short base, char *buffer, int len)
281{
282 for (; len; len--) {
283 unsigned char h;
284
285 w_ctr(base, 0x4);
286 h = r_str(base) & 0xf0;
287 w_ctr(base, 0x6);
288 *buffer++ = h | ((r_str(base) & 0xf0) >> 4);
289 }
290 return 1; /* All went well - we hope! */
291}
292
293static int ppa_out(ppa_struct *dev, char *buffer, int len)
294{
295 int r;
296 unsigned short ppb = dev->base;
297
298 r = ppa_wait(dev);
299
300 if ((r & 0x50) != 0x40) {
301 ppa_fail(dev, DID_ERROR);
302 return 0;
303 }
304 switch (dev->mode) {
305 case PPA_NIBBLE:
306 case PPA_PS2:
307 /* 8 bit output, with a loop */
308 r = ppa_byte_out(ppb, buffer, len);
309 break;
310
311 case PPA_EPP_32:
312 case PPA_EPP_16:
313 case PPA_EPP_8:
314 epp_reset(ppb);
315 w_ctr(ppb, 0x4);
316#ifdef CONFIG_SCSI_IZIP_EPP16
317 if (!(((long) buffer | len) & 0x01))
318 outsw(ppb + 4, buffer, len >> 1);
319#else
320 if (!(((long) buffer | len) & 0x03))
321 outsl(ppb + 4, buffer, len >> 2);
322#endif
323 else
324 outsb(ppb + 4, buffer, len);
325 w_ctr(ppb, 0xc);
326 r = !(r_str(ppb) & 0x01);
327 w_ctr(ppb, 0xc);
328 ecp_sync(dev);
329 break;
330
331 default:
332 printk(KERN_ERR "PPA: bug in ppa_out()\n");
333 r = 0;
334 }
335 return r;
336}
337
338static int ppa_in(ppa_struct *dev, char *buffer, int len)
339{
340 int r;
341 unsigned short ppb = dev->base;
342
343 r = ppa_wait(dev);
344
345 if ((r & 0x50) != 0x50) {
346 ppa_fail(dev, DID_ERROR);
347 return 0;
348 }
349 switch (dev->mode) {
350 case PPA_NIBBLE:
351 /* 4 bit input, with a loop */
352 r = ppa_nibble_in(ppb, buffer, len);
353 w_ctr(ppb, 0xc);
354 break;
355
356 case PPA_PS2:
357 /* 8 bit input, with a loop */
358 w_ctr(ppb, 0x25);
359 r = ppa_byte_in(ppb, buffer, len);
360 w_ctr(ppb, 0x4);
361 w_ctr(ppb, 0xc);
362 break;
363
364 case PPA_EPP_32:
365 case PPA_EPP_16:
366 case PPA_EPP_8:
367 epp_reset(ppb);
368 w_ctr(ppb, 0x24);
369#ifdef CONFIG_SCSI_IZIP_EPP16
370 if (!(((long) buffer | len) & 0x01))
371 insw(ppb + 4, buffer, len >> 1);
372#else
373 if (!(((long) buffer | len) & 0x03))
374 insl(ppb + 4, buffer, len >> 2);
375#endif
376 else
377 insb(ppb + 4, buffer, len);
378 w_ctr(ppb, 0x2c);
379 r = !(r_str(ppb) & 0x01);
380 w_ctr(ppb, 0x2c);
381 ecp_sync(dev);
382 break;
383
384 default:
385 printk(KERN_ERR "PPA: bug in ppa_ins()\n");
386 r = 0;
387 break;
388 }
389 return r;
390}
391
392/* end of ppa_io.h */
393static inline void ppa_d_pulse(unsigned short ppb, unsigned char b)
394{
395 w_dtr(ppb, b);
396 w_ctr(ppb, 0xc);
397 w_ctr(ppb, 0xe);
398 w_ctr(ppb, 0xc);
399 w_ctr(ppb, 0x4);
400 w_ctr(ppb, 0xc);
401}
402
403static void ppa_disconnect(ppa_struct *dev)
404{
405 unsigned short ppb = dev->base;
406
407 ppa_d_pulse(ppb, 0);
408 ppa_d_pulse(ppb, 0x3c);
409 ppa_d_pulse(ppb, 0x20);
410 ppa_d_pulse(ppb, 0xf);
411}
412
413static inline void ppa_c_pulse(unsigned short ppb, unsigned char b)
414{
415 w_dtr(ppb, b);
416 w_ctr(ppb, 0x4);
417 w_ctr(ppb, 0x6);
418 w_ctr(ppb, 0x4);
419 w_ctr(ppb, 0xc);
420}
421
422static inline void ppa_connect(ppa_struct *dev, int flag)
423{
424 unsigned short ppb = dev->base;
425
426 ppa_c_pulse(ppb, 0);
427 ppa_c_pulse(ppb, 0x3c);
428 ppa_c_pulse(ppb, 0x20);
429 if ((flag == CONNECT_EPP_MAYBE) && IN_EPP_MODE(dev->mode))
430 ppa_c_pulse(ppb, 0xcf);
431 else
432 ppa_c_pulse(ppb, 0x8f);
433}
434
435static int ppa_select(ppa_struct *dev, int target)
436{
437 int k;
438 unsigned short ppb = dev->base;
439
440 /*
441 * Bit 6 (0x40) is the device selected bit.
442 * First we must wait till the current device goes off line...
443 */
444 k = PPA_SELECT_TMO;
445 do {
446 k--;
447 udelay(1);
448 } while ((r_str(ppb) & 0x40) && (k));
449 if (!k)
450 return 0;
451
452 w_dtr(ppb, (1 << target));
453 w_ctr(ppb, 0xe);
454 w_ctr(ppb, 0xc);
455 w_dtr(ppb, 0x80); /* This is NOT the initator */
456 w_ctr(ppb, 0x8);
457
458 k = PPA_SELECT_TMO;
459 do {
460 k--;
461 udelay(1);
462 }
463 while (!(r_str(ppb) & 0x40) && (k));
464 if (!k)
465 return 0;
466
467 return 1;
468}
469
470/*
471 * This is based on a trace of what the Iomega DOS 'guest' driver does.
472 * I've tried several different kinds of parallel ports with guest and
473 * coded this to react in the same ways that it does.
474 *
475 * The return value from this function is just a hint about where the
476 * handshaking failed.
477 *
478 */
479static int ppa_init(ppa_struct *dev)
480{
481 int retv;
482 unsigned short ppb = dev->base;
483
484 ppa_disconnect(dev);
485 ppa_connect(dev, CONNECT_NORMAL);
486
487 retv = 2; /* Failed */
488
489 w_ctr(ppb, 0xe);
490 if ((r_str(ppb) & 0x08) == 0x08)
491 retv--;
492
493 w_ctr(ppb, 0xc);
494 if ((r_str(ppb) & 0x08) == 0x00)
495 retv--;
496
497 if (!retv)
498 ppa_reset_pulse(ppb);
499 udelay(1000); /* Allow devices to settle down */
500 ppa_disconnect(dev);
501 udelay(1000); /* Another delay to allow devices to settle */
502
503 if (retv)
504 return -EIO;
505
506 return device_check(dev);
507}
508
509static inline int ppa_send_command(struct scsi_cmnd *cmd)
510{
511 ppa_struct *dev = ppa_dev(cmd->device->host);
512 int k;
513
514 w_ctr(dev->base, 0x0c);
515
516 for (k = 0; k < cmd->cmd_len; k++)
517 if (!ppa_out(dev, &cmd->cmnd[k], 1))
518 return 0;
519 return 1;
520}
521
522/*
523 * The bulk flag enables some optimisations in the data transfer loops,
524 * it should be true for any command that transfers data in integral
525 * numbers of sectors.
526 *
527 * The driver appears to remain stable if we speed up the parallel port
528 * i/o in this function, but not elsewhere.
529 */
530static int ppa_completion(struct scsi_cmnd *cmd)
531{
532 /* Return codes:
533 * -1 Error
534 * 0 Told to schedule
535 * 1 Finished data transfer
536 */
537 ppa_struct *dev = ppa_dev(cmd->device->host);
538 unsigned short ppb = dev->base;
539 unsigned long start_jiffies = jiffies;
540
541 unsigned char r, v;
542 int fast, bulk, status;
543
544 v = cmd->cmnd[0];
545 bulk = ((v == READ_6) ||
546 (v == READ_10) || (v == WRITE_6) || (v == WRITE_10));
547
548 /*
549 * We only get here if the drive is ready to comunicate,
550 * hence no need for a full ppa_wait.
551 */
552 r = (r_str(ppb) & 0xf0);
553
554 while (r != (unsigned char) 0xf0) {
555 /*
556 * If we have been running for more than a full timer tick
557 * then take a rest.
558 */
559 if (time_after(jiffies, start_jiffies + 1))
560 return 0;
561
562 if ((cmd->SCp.this_residual <= 0)) {
563 ppa_fail(dev, DID_ERROR);
564 return -1; /* ERROR_RETURN */
565 }
566
567 /* On some hardware we have SCSI disconnected (6th bit low)
568 * for about 100usecs. It is too expensive to wait a
569 * tick on every loop so we busy wait for no more than
570 * 500usecs to give the drive a chance first. We do not
571 * change things for "normal" hardware since generally
572 * the 6th bit is always high.
573 * This makes the CPU load higher on some hardware
574 * but otherwise we can not get more than 50K/secs
575 * on this problem hardware.
576 */
577 if ((r & 0xc0) != 0xc0) {
578 /* Wait for reconnection should be no more than
579 * jiffy/2 = 5ms = 5000 loops
580 */
581 unsigned long k = dev->recon_tmo;
582 for (; k && ((r = (r_str(ppb) & 0xf0)) & 0xc0) != 0xc0;
583 k--)
584 udelay(1);
585
586 if (!k)
587 return 0;
588 }
589
590 /* determine if we should use burst I/O */
591 fast = (bulk && (cmd->SCp.this_residual >= PPA_BURST_SIZE))
592 ? PPA_BURST_SIZE : 1;
593
594 if (r == (unsigned char) 0xc0)
595 status = ppa_out(dev, cmd->SCp.ptr, fast);
596 else
597 status = ppa_in(dev, cmd->SCp.ptr, fast);
598
599 cmd->SCp.ptr += fast;
600 cmd->SCp.this_residual -= fast;
601
602 if (!status) {
603 ppa_fail(dev, DID_BUS_BUSY);
604 return -1; /* ERROR_RETURN */
605 }
606 if (cmd->SCp.buffer && !cmd->SCp.this_residual) {
607 /* if scatter/gather, advance to the next segment */
608 if (cmd->SCp.buffers_residual--) {
609 cmd->SCp.buffer++;
610 cmd->SCp.this_residual =
611 cmd->SCp.buffer->length;
612 cmd->SCp.ptr = sg_virt(cmd->SCp.buffer);
613 }
614 }
615 /* Now check to see if the drive is ready to comunicate */
616 r = (r_str(ppb) & 0xf0);
617 /* If not, drop back down to the scheduler and wait a timer tick */
618 if (!(r & 0x80))
619 return 0;
620 }
621 return 1; /* FINISH_RETURN */
622}
623
624/*
625 * Since the PPA itself doesn't generate interrupts, we use
626 * the scheduler's task queue to generate a stream of call-backs and
627 * complete the request when the drive is ready.
628 */
629static void ppa_interrupt(struct work_struct *work)
630{
631 ppa_struct *dev = container_of(work, ppa_struct, ppa_tq.work);
632 struct scsi_cmnd *cmd = dev->cur_cmd;
633
634 if (!cmd) {
635 printk(KERN_ERR "PPA: bug in ppa_interrupt\n");
636 return;
637 }
638 if (ppa_engine(dev, cmd)) {
639 schedule_delayed_work(&dev->ppa_tq, 1);
640 return;
641 }
642 /* Command must of completed hence it is safe to let go... */
643#if PPA_DEBUG > 0
644 switch ((cmd->result >> 16) & 0xff) {
645 case DID_OK:
646 break;
647 case DID_NO_CONNECT:
648 printk(KERN_DEBUG "ppa: no device at SCSI ID %i\n", cmd->device->target);
649 break;
650 case DID_BUS_BUSY:
651 printk(KERN_DEBUG "ppa: BUS BUSY - EPP timeout detected\n");
652 break;
653 case DID_TIME_OUT:
654 printk(KERN_DEBUG "ppa: unknown timeout\n");
655 break;
656 case DID_ABORT:
657 printk(KERN_DEBUG "ppa: told to abort\n");
658 break;
659 case DID_PARITY:
660 printk(KERN_DEBUG "ppa: parity error (???)\n");
661 break;
662 case DID_ERROR:
663 printk(KERN_DEBUG "ppa: internal driver error\n");
664 break;
665 case DID_RESET:
666 printk(KERN_DEBUG "ppa: told to reset device\n");
667 break;
668 case DID_BAD_INTR:
669 printk(KERN_WARNING "ppa: bad interrupt (???)\n");
670 break;
671 default:
672 printk(KERN_WARNING "ppa: bad return code (%02x)\n",
673 (cmd->result >> 16) & 0xff);
674 }
675#endif
676
677 if (cmd->SCp.phase > 1)
678 ppa_disconnect(dev);
679
680 ppa_pb_dismiss(dev);
681
682 dev->cur_cmd = NULL;
683
684 cmd->scsi_done(cmd);
685}
686
687static int ppa_engine(ppa_struct *dev, struct scsi_cmnd *cmd)
688{
689 unsigned short ppb = dev->base;
690 unsigned char l = 0, h = 0;
691 int retv;
692
693 /* First check for any errors that may of occurred
694 * Here we check for internal errors
695 */
696 if (dev->failed)
697 return 0;
698
699 switch (cmd->SCp.phase) {
700 case 0: /* Phase 0 - Waiting for parport */
701 if (time_after(jiffies, dev->jstart + HZ)) {
702 /*
703 * We waited more than a second
704 * for parport to call us
705 */
706 ppa_fail(dev, DID_BUS_BUSY);
707 return 0;
708 }
709 return 1; /* wait until ppa_wakeup claims parport */
710 case 1: /* Phase 1 - Connected */
711 { /* Perform a sanity check for cable unplugged */
712 int retv = 2; /* Failed */
713
714 ppa_connect(dev, CONNECT_EPP_MAYBE);
715
716 w_ctr(ppb, 0xe);
717 if ((r_str(ppb) & 0x08) == 0x08)
718 retv--;
719
720 w_ctr(ppb, 0xc);
721 if ((r_str(ppb) & 0x08) == 0x00)
722 retv--;
723
724 if (retv) {
725 if (time_after(jiffies, dev->jstart + (1 * HZ))) {
726 printk(KERN_ERR "ppa: Parallel port cable is unplugged.\n");
727 ppa_fail(dev, DID_BUS_BUSY);
728 return 0;
729 } else {
730 ppa_disconnect(dev);
731 return 1; /* Try again in a jiffy */
732 }
733 }
734 cmd->SCp.phase++;
735 }
736
737 case 2: /* Phase 2 - We are now talking to the scsi bus */
738 if (!ppa_select(dev, scmd_id(cmd))) {
739 ppa_fail(dev, DID_NO_CONNECT);
740 return 0;
741 }
742 cmd->SCp.phase++;
743
744 case 3: /* Phase 3 - Ready to accept a command */
745 w_ctr(ppb, 0x0c);
746 if (!(r_str(ppb) & 0x80))
747 return 1;
748
749 if (!ppa_send_command(cmd))
750 return 0;
751 cmd->SCp.phase++;
752
753 case 4: /* Phase 4 - Setup scatter/gather buffers */
754 if (scsi_bufflen(cmd)) {
755 cmd->SCp.buffer = scsi_sglist(cmd);
756 cmd->SCp.this_residual = cmd->SCp.buffer->length;
757 cmd->SCp.ptr = sg_virt(cmd->SCp.buffer);
758 } else {
759 cmd->SCp.buffer = NULL;
760 cmd->SCp.this_residual = 0;
761 cmd->SCp.ptr = NULL;
762 }
763 cmd->SCp.buffers_residual = scsi_sg_count(cmd) - 1;
764 cmd->SCp.phase++;
765
766 case 5: /* Phase 5 - Data transfer stage */
767 w_ctr(ppb, 0x0c);
768 if (!(r_str(ppb) & 0x80))
769 return 1;
770
771 retv = ppa_completion(cmd);
772 if (retv == -1)
773 return 0;
774 if (retv == 0)
775 return 1;
776 cmd->SCp.phase++;
777
778 case 6: /* Phase 6 - Read status/message */
779 cmd->result = DID_OK << 16;
780 /* Check for data overrun */
781 if (ppa_wait(dev) != (unsigned char) 0xf0) {
782 ppa_fail(dev, DID_ERROR);
783 return 0;
784 }
785 if (ppa_in(dev, &l, 1)) { /* read status byte */
786 /* Check for optional message byte */
787 if (ppa_wait(dev) == (unsigned char) 0xf0)
788 ppa_in(dev, &h, 1);
789 cmd->result =
790 (DID_OK << 16) + (h << 8) + (l & STATUS_MASK);
791 }
792 return 0; /* Finished */
793 break;
794
795 default:
796 printk(KERN_ERR "ppa: Invalid scsi phase\n");
797 }
798 return 0;
799}
800
801static int ppa_queuecommand_lck(struct scsi_cmnd *cmd,
802 void (*done) (struct scsi_cmnd *))
803{
804 ppa_struct *dev = ppa_dev(cmd->device->host);
805
806 if (dev->cur_cmd) {
807 printk(KERN_ERR "PPA: bug in ppa_queuecommand\n");
808 return 0;
809 }
810 dev->failed = 0;
811 dev->jstart = jiffies;
812 dev->cur_cmd = cmd;
813 cmd->scsi_done = done;
814 cmd->result = DID_ERROR << 16; /* default return code */
815 cmd->SCp.phase = 0; /* bus free */
816
817 schedule_delayed_work(&dev->ppa_tq, 0);
818
819 ppa_pb_claim(dev);
820
821 return 0;
822}
823
824static DEF_SCSI_QCMD(ppa_queuecommand)
825
826/*
827 * Apparently the disk->capacity attribute is off by 1 sector
828 * for all disk drives. We add the one here, but it should really
829 * be done in sd.c. Even if it gets fixed there, this will still
830 * work.
831 */
832static int ppa_biosparam(struct scsi_device *sdev, struct block_device *dev,
833 sector_t capacity, int ip[])
834{
835 ip[0] = 0x40;
836 ip[1] = 0x20;
837 ip[2] = ((unsigned long) capacity + 1) / (ip[0] * ip[1]);
838 if (ip[2] > 1024) {
839 ip[0] = 0xff;
840 ip[1] = 0x3f;
841 ip[2] = ((unsigned long) capacity + 1) / (ip[0] * ip[1]);
842 if (ip[2] > 1023)
843 ip[2] = 1023;
844 }
845 return 0;
846}
847
848static int ppa_abort(struct scsi_cmnd *cmd)
849{
850 ppa_struct *dev = ppa_dev(cmd->device->host);
851 /*
852 * There is no method for aborting commands since Iomega
853 * have tied the SCSI_MESSAGE line high in the interface
854 */
855
856 switch (cmd->SCp.phase) {
857 case 0: /* Do not have access to parport */
858 case 1: /* Have not connected to interface */
859 dev->cur_cmd = NULL; /* Forget the problem */
860 return SUCCESS;
861 break;
862 default: /* SCSI command sent, can not abort */
863 return FAILED;
864 break;
865 }
866}
867
868static void ppa_reset_pulse(unsigned int base)
869{
870 w_dtr(base, 0x40);
871 w_ctr(base, 0x8);
872 udelay(30);
873 w_ctr(base, 0xc);
874}
875
876static int ppa_reset(struct scsi_cmnd *cmd)
877{
878 ppa_struct *dev = ppa_dev(cmd->device->host);
879
880 if (cmd->SCp.phase)
881 ppa_disconnect(dev);
882 dev->cur_cmd = NULL; /* Forget the problem */
883
884 ppa_connect(dev, CONNECT_NORMAL);
885 ppa_reset_pulse(dev->base);
886 mdelay(1); /* device settle delay */
887 ppa_disconnect(dev);
888 mdelay(1); /* device settle delay */
889 return SUCCESS;
890}
891
892static int device_check(ppa_struct *dev)
893{
894 /* This routine looks for a device and then attempts to use EPP
895 to send a command. If all goes as planned then EPP is available. */
896
897 static u8 cmd[6] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
898 int loop, old_mode, status, k, ppb = dev->base;
899 unsigned char l;
900
901 old_mode = dev->mode;
902 for (loop = 0; loop < 8; loop++) {
903 /* Attempt to use EPP for Test Unit Ready */
904 if ((ppb & 0x0007) == 0x0000)
905 dev->mode = PPA_EPP_32;
906
907second_pass:
908 ppa_connect(dev, CONNECT_EPP_MAYBE);
909 /* Select SCSI device */
910 if (!ppa_select(dev, loop)) {
911 ppa_disconnect(dev);
912 continue;
913 }
914 printk(KERN_INFO "ppa: Found device at ID %i, Attempting to use %s\n",
915 loop, PPA_MODE_STRING[dev->mode]);
916
917 /* Send SCSI command */
918 status = 1;
919 w_ctr(ppb, 0x0c);
920 for (l = 0; (l < 6) && (status); l++)
921 status = ppa_out(dev, cmd, 1);
922
923 if (!status) {
924 ppa_disconnect(dev);
925 ppa_connect(dev, CONNECT_EPP_MAYBE);
926 w_dtr(ppb, 0x40);
927 w_ctr(ppb, 0x08);
928 udelay(30);
929 w_ctr(ppb, 0x0c);
930 udelay(1000);
931 ppa_disconnect(dev);
932 udelay(1000);
933 if (dev->mode == PPA_EPP_32) {
934 dev->mode = old_mode;
935 goto second_pass;
936 }
937 return -EIO;
938 }
939 w_ctr(ppb, 0x0c);
940 k = 1000000; /* 1 Second */
941 do {
942 l = r_str(ppb);
943 k--;
944 udelay(1);
945 } while (!(l & 0x80) && (k));
946
947 l &= 0xf0;
948
949 if (l != 0xf0) {
950 ppa_disconnect(dev);
951 ppa_connect(dev, CONNECT_EPP_MAYBE);
952 ppa_reset_pulse(ppb);
953 udelay(1000);
954 ppa_disconnect(dev);
955 udelay(1000);
956 if (dev->mode == PPA_EPP_32) {
957 dev->mode = old_mode;
958 goto second_pass;
959 }
960 return -EIO;
961 }
962 ppa_disconnect(dev);
963 printk(KERN_INFO "ppa: Communication established with ID %i using %s\n",
964 loop, PPA_MODE_STRING[dev->mode]);
965 ppa_connect(dev, CONNECT_EPP_MAYBE);
966 ppa_reset_pulse(ppb);
967 udelay(1000);
968 ppa_disconnect(dev);
969 udelay(1000);
970 return 0;
971 }
972 return -ENODEV;
973}
974
975static int ppa_adjust_queue(struct scsi_device *device)
976{
977 blk_queue_bounce_limit(device->request_queue, BLK_BOUNCE_HIGH);
978 return 0;
979}
980
981static struct scsi_host_template ppa_template = {
982 .module = THIS_MODULE,
983 .proc_name = "ppa",
984 .proc_info = ppa_proc_info,
985 .name = "Iomega VPI0 (ppa) interface",
986 .queuecommand = ppa_queuecommand,
987 .eh_abort_handler = ppa_abort,
988 .eh_bus_reset_handler = ppa_reset,
989 .eh_host_reset_handler = ppa_reset,
990 .bios_param = ppa_biosparam,
991 .this_id = -1,
992 .sg_tablesize = SG_ALL,
993 .cmd_per_lun = 1,
994 .use_clustering = ENABLE_CLUSTERING,
995 .can_queue = 1,
996 .slave_alloc = ppa_adjust_queue,
997};
998
999/***************************************************************************
1000 * Parallel port probing routines *
1001 ***************************************************************************/
1002
1003static LIST_HEAD(ppa_hosts);
1004
1005static int __ppa_attach(struct parport *pb)
1006{
1007 struct Scsi_Host *host;
1008 DECLARE_WAIT_QUEUE_HEAD_ONSTACK(waiting);
1009 DEFINE_WAIT(wait);
1010 ppa_struct *dev;
1011 int ports;
1012 int modes, ppb, ppb_hi;
1013 int err = -ENOMEM;
1014
1015 dev = kzalloc(sizeof(ppa_struct), GFP_KERNEL);
1016 if (!dev)
1017 return -ENOMEM;
1018 dev->base = -1;
1019 dev->mode = PPA_AUTODETECT;
1020 dev->recon_tmo = PPA_RECON_TMO;
1021 init_waitqueue_head(&waiting);
1022 dev->dev = parport_register_device(pb, "ppa", NULL, ppa_wakeup,
1023 NULL, 0, dev);
1024
1025 if (!dev->dev)
1026 goto out;
1027
1028 /* Claim the bus so it remembers what we do to the control
1029 * registers. [ CTR and ECP ]
1030 */
1031 err = -EBUSY;
1032 dev->waiting = &waiting;
1033 prepare_to_wait(&waiting, &wait, TASK_UNINTERRUPTIBLE);
1034 if (ppa_pb_claim(dev))
1035 schedule_timeout(3 * HZ);
1036 if (dev->wanted) {
1037 printk(KERN_ERR "ppa%d: failed to claim parport because "
1038 "a pardevice is owning the port for too long "
1039 "time!\n", pb->number);
1040 ppa_pb_dismiss(dev);
1041 dev->waiting = NULL;
1042 finish_wait(&waiting, &wait);
1043 goto out1;
1044 }
1045 dev->waiting = NULL;
1046 finish_wait(&waiting, &wait);
1047 ppb = dev->base = dev->dev->port->base;
1048 ppb_hi = dev->dev->port->base_hi;
1049 w_ctr(ppb, 0x0c);
1050 modes = dev->dev->port->modes;
1051
1052 /* Mode detection works up the chain of speed
1053 * This avoids a nasty if-then-else-if-... tree
1054 */
1055 dev->mode = PPA_NIBBLE;
1056
1057 if (modes & PARPORT_MODE_TRISTATE)
1058 dev->mode = PPA_PS2;
1059
1060 if (modes & PARPORT_MODE_ECP) {
1061 w_ecr(ppb_hi, 0x20);
1062 dev->mode = PPA_PS2;
1063 }
1064 if ((modes & PARPORT_MODE_EPP) && (modes & PARPORT_MODE_ECP))
1065 w_ecr(ppb_hi, 0x80);
1066
1067 /* Done configuration */
1068
1069 err = ppa_init(dev);
1070 ppa_pb_release(dev);
1071
1072 if (err)
1073 goto out1;
1074
1075 /* now the glue ... */
1076 if (dev->mode == PPA_NIBBLE || dev->mode == PPA_PS2)
1077 ports = 3;
1078 else
1079 ports = 8;
1080
1081 INIT_DELAYED_WORK(&dev->ppa_tq, ppa_interrupt);
1082
1083 err = -ENOMEM;
1084 host = scsi_host_alloc(&ppa_template, sizeof(ppa_struct *));
1085 if (!host)
1086 goto out1;
1087 host->io_port = pb->base;
1088 host->n_io_port = ports;
1089 host->dma_channel = -1;
1090 host->unique_id = pb->number;
1091 *(ppa_struct **)&host->hostdata = dev;
1092 dev->host = host;
1093 list_add_tail(&dev->list, &ppa_hosts);
1094 err = scsi_add_host(host, NULL);
1095 if (err)
1096 goto out2;
1097 scsi_scan_host(host);
1098 return 0;
1099out2:
1100 list_del_init(&dev->list);
1101 scsi_host_put(host);
1102out1:
1103 parport_unregister_device(dev->dev);
1104out:
1105 kfree(dev);
1106 return err;
1107}
1108
1109static void ppa_attach(struct parport *pb)
1110{
1111 __ppa_attach(pb);
1112}
1113
1114static void ppa_detach(struct parport *pb)
1115{
1116 ppa_struct *dev;
1117 list_for_each_entry(dev, &ppa_hosts, list) {
1118 if (dev->dev->port == pb) {
1119 list_del_init(&dev->list);
1120 scsi_remove_host(dev->host);
1121 scsi_host_put(dev->host);
1122 parport_unregister_device(dev->dev);
1123 kfree(dev);
1124 break;
1125 }
1126 }
1127}
1128
1129static struct parport_driver ppa_driver = {
1130 .name = "ppa",
1131 .attach = ppa_attach,
1132 .detach = ppa_detach,
1133};
1134
1135static int __init ppa_driver_init(void)
1136{
1137 printk(KERN_INFO "ppa: Version %s\n", PPA_VERSION);
1138 return parport_register_driver(&ppa_driver);
1139}
1140
1141static void __exit ppa_driver_exit(void)
1142{
1143 parport_unregister_driver(&ppa_driver);
1144}
1145
1146module_init(ppa_driver_init);
1147module_exit(ppa_driver_exit);
1148MODULE_LICENSE("GPL");
1/* ppa.c -- low level driver for the IOMEGA PPA3
2 * parallel port SCSI host adapter.
3 *
4 * (The PPA3 is the embedded controller in the ZIP drive.)
5 *
6 * (c) 1995,1996 Grant R. Guenther, grant@torque.net,
7 * under the terms of the GNU General Public License.
8 *
9 */
10
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; /* Parport device entry */
32 int base; /* Actual port address */
33 int mode; /* Transfer mode */
34 struct scsi_cmnd *cur_cmd; /* Current queued command */
35 struct delayed_work ppa_tq; /* Polling interrupt stuff */
36 unsigned long jstart; /* Jiffies at start */
37 unsigned long recon_tmo; /* How many usecs to wait for reconnection (6th bit) */
38 unsigned int failed:1; /* Failure flag */
39 unsigned wanted:1; /* Parport sharing busy flag */
40 unsigned int dev_no; /* Device number */
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 unsigned int mode = PPA_AUTODETECT;
49module_param(mode, uint, 0644);
50MODULE_PARM_DESC(mode, "Transfer mode (0 = Autodetect, 1 = SPP 4-bit, "
51 "2 = SPP 8-bit, 3 = EPP 8-bit, 4 = EPP 16-bit, 5 = EPP 32-bit");
52
53static struct scsi_pointer *ppa_scsi_pointer(struct scsi_cmnd *cmd)
54{
55 return scsi_cmd_priv(cmd);
56}
57
58static inline ppa_struct *ppa_dev(struct Scsi_Host *host)
59{
60 return *(ppa_struct **)&host->hostdata;
61}
62
63static DEFINE_SPINLOCK(arbitration_lock);
64
65static void got_it(ppa_struct *dev)
66{
67 dev->base = dev->dev->port->base;
68 if (dev->cur_cmd)
69 ppa_scsi_pointer(dev->cur_cmd)->phase = 1;
70 else
71 wake_up(dev->waiting);
72}
73
74static void ppa_wakeup(void *ref)
75{
76 ppa_struct *dev = (ppa_struct *) ref;
77 unsigned long flags;
78
79 spin_lock_irqsave(&arbitration_lock, flags);
80 if (dev->wanted) {
81 parport_claim(dev->dev);
82 got_it(dev);
83 dev->wanted = 0;
84 }
85 spin_unlock_irqrestore(&arbitration_lock, flags);
86 return;
87}
88
89static int ppa_pb_claim(ppa_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 ppa_pb_dismiss(ppa_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 ppa_pb_release(ppa_struct *dev)
116{
117 parport_release(dev->dev);
118}
119
120/*
121 * Start of Chipset kludges
122 */
123
124/* This is to give the ppa driver a way to modify the timings (and other
125 * parameters) by writing to the /proc/scsi/ppa/0 file.
126 * Very simple method really... (To simple, no error checking :( )
127 * Reason: Kernel hackers HATE having to unload and reload modules for
128 * testing...
129 * Also gives a method to use a script to obtain optimum timings (TODO)
130 */
131
132static inline int ppa_write_info(struct Scsi_Host *host, char *buffer, int length)
133{
134 ppa_struct *dev = ppa_dev(host);
135 unsigned long x;
136
137 if ((length > 5) && (strncmp(buffer, "mode=", 5) == 0)) {
138 x = simple_strtoul(buffer + 5, NULL, 0);
139 dev->mode = x;
140 return length;
141 }
142 if ((length > 10) && (strncmp(buffer, "recon_tmo=", 10) == 0)) {
143 x = simple_strtoul(buffer + 10, NULL, 0);
144 dev->recon_tmo = x;
145 printk(KERN_INFO "ppa: recon_tmo set to %ld\n", x);
146 return length;
147 }
148 printk(KERN_WARNING "ppa /proc: invalid variable\n");
149 return -EINVAL;
150}
151
152static int ppa_show_info(struct seq_file *m, struct Scsi_Host *host)
153{
154 ppa_struct *dev = ppa_dev(host);
155
156 seq_printf(m, "Version : %s\n", PPA_VERSION);
157 seq_printf(m, "Parport : %s\n", dev->dev->port->name);
158 seq_printf(m, "Mode : %s\n", PPA_MODE_STRING[dev->mode]);
159#if PPA_DEBUG > 0
160 seq_printf(m, "recon_tmo : %lu\n", dev->recon_tmo);
161#endif
162 return 0;
163}
164
165static int device_check(ppa_struct *dev, bool autodetect);
166
167#if PPA_DEBUG > 0
168#define ppa_fail(x,y) printk("ppa: ppa_fail(%i) from %s at line %d\n",\
169 y, __func__, __LINE__); ppa_fail_func(x,y);
170static inline void ppa_fail_func(ppa_struct *dev, int error_code)
171#else
172static inline void ppa_fail(ppa_struct *dev, int error_code)
173#endif
174{
175 /* If we fail a device then we trash status / message bytes */
176 if (dev->cur_cmd) {
177 dev->cur_cmd->result = error_code << 16;
178 dev->failed = 1;
179 }
180}
181
182/*
183 * Wait for the high bit to be set.
184 *
185 * In principle, this could be tied to an interrupt, but the adapter
186 * doesn't appear to be designed to support interrupts. We spin on
187 * the 0x80 ready bit.
188 */
189static unsigned char ppa_wait(ppa_struct *dev)
190{
191 int k;
192 unsigned short ppb = dev->base;
193 unsigned char r;
194
195 k = PPA_SPIN_TMO;
196 /* Wait for bit 6 and 7 - PJC */
197 for (r = r_str(ppb); ((r & 0xc0) != 0xc0) && (k); k--) {
198 udelay(1);
199 r = r_str(ppb);
200 }
201
202 /*
203 * return some status information.
204 * Semantics: 0xc0 = ZIP wants more data
205 * 0xd0 = ZIP wants to send more data
206 * 0xe0 = ZIP is expecting SCSI command data
207 * 0xf0 = end of transfer, ZIP is sending status
208 */
209 if (k)
210 return (r & 0xf0);
211
212 /* Counter expired - Time out occurred */
213 ppa_fail(dev, DID_TIME_OUT);
214 printk(KERN_WARNING "ppa timeout in ppa_wait\n");
215 return 0; /* command timed out */
216}
217
218/*
219 * Clear EPP Timeout Bit
220 */
221static inline void epp_reset(unsigned short ppb)
222{
223 int i;
224
225 i = r_str(ppb);
226 w_str(ppb, i);
227 w_str(ppb, i & 0xfe);
228}
229
230/*
231 * Wait for empty ECP fifo (if we are in ECP fifo mode only)
232 */
233static inline void ecp_sync(ppa_struct *dev)
234{
235 int i, ppb_hi = dev->dev->port->base_hi;
236
237 if (ppb_hi == 0)
238 return;
239
240 if ((r_ecr(ppb_hi) & 0xe0) == 0x60) { /* mode 011 == ECP fifo mode */
241 for (i = 0; i < 100; i++) {
242 if (r_ecr(ppb_hi) & 0x01)
243 return;
244 udelay(5);
245 }
246 printk(KERN_WARNING "ppa: ECP sync failed as data still present in FIFO.\n");
247 }
248}
249
250static int ppa_byte_out(unsigned short base, const char *buffer, int len)
251{
252 int i;
253
254 for (i = len; i; i--) {
255 w_dtr(base, *buffer++);
256 w_ctr(base, 0xe);
257 w_ctr(base, 0xc);
258 }
259 return 1; /* All went well - we hope! */
260}
261
262static int ppa_byte_in(unsigned short base, char *buffer, int len)
263{
264 int i;
265
266 for (i = len; i; i--) {
267 *buffer++ = r_dtr(base);
268 w_ctr(base, 0x27);
269 w_ctr(base, 0x25);
270 }
271 return 1; /* All went well - we hope! */
272}
273
274static int ppa_nibble_in(unsigned short base, char *buffer, int len)
275{
276 for (; len; len--) {
277 unsigned char h;
278
279 w_ctr(base, 0x4);
280 h = r_str(base) & 0xf0;
281 w_ctr(base, 0x6);
282 *buffer++ = h | ((r_str(base) & 0xf0) >> 4);
283 }
284 return 1; /* All went well - we hope! */
285}
286
287static int ppa_out(ppa_struct *dev, char *buffer, int len)
288{
289 int r;
290 unsigned short ppb = dev->base;
291
292 r = ppa_wait(dev);
293
294 if ((r & 0x50) != 0x40) {
295 ppa_fail(dev, DID_ERROR);
296 return 0;
297 }
298 switch (dev->mode) {
299 case PPA_NIBBLE:
300 case PPA_PS2:
301 /* 8 bit output, with a loop */
302 r = ppa_byte_out(ppb, buffer, len);
303 break;
304
305 case PPA_EPP_32:
306 case PPA_EPP_16:
307 case PPA_EPP_8:
308 epp_reset(ppb);
309 w_ctr(ppb, 0x4);
310 if (dev->mode == PPA_EPP_32 && !(((long) buffer | len) & 0x03))
311 outsl(ppb + 4, buffer, len >> 2);
312 else if (dev->mode == PPA_EPP_16 && !(((long) buffer | len) & 0x01))
313 outsw(ppb + 4, buffer, len >> 1);
314 else
315 outsb(ppb + 4, buffer, len);
316 w_ctr(ppb, 0xc);
317 r = !(r_str(ppb) & 0x01);
318 w_ctr(ppb, 0xc);
319 ecp_sync(dev);
320 break;
321
322 default:
323 printk(KERN_ERR "PPA: bug in ppa_out()\n");
324 r = 0;
325 }
326 return r;
327}
328
329static int ppa_in(ppa_struct *dev, char *buffer, int len)
330{
331 int r;
332 unsigned short ppb = dev->base;
333
334 r = ppa_wait(dev);
335
336 if ((r & 0x50) != 0x50) {
337 ppa_fail(dev, DID_ERROR);
338 return 0;
339 }
340 switch (dev->mode) {
341 case PPA_NIBBLE:
342 /* 4 bit input, with a loop */
343 r = ppa_nibble_in(ppb, buffer, len);
344 w_ctr(ppb, 0xc);
345 break;
346
347 case PPA_PS2:
348 /* 8 bit input, with a loop */
349 w_ctr(ppb, 0x25);
350 r = ppa_byte_in(ppb, buffer, len);
351 w_ctr(ppb, 0x4);
352 w_ctr(ppb, 0xc);
353 break;
354
355 case PPA_EPP_32:
356 case PPA_EPP_16:
357 case PPA_EPP_8:
358 epp_reset(ppb);
359 w_ctr(ppb, 0x24);
360 if (dev->mode == PPA_EPP_32 && !(((long) buffer | len) & 0x03))
361 insl(ppb + 4, buffer, len >> 2);
362 else if (dev->mode == PPA_EPP_16 && !(((long) buffer | len) & 0x01))
363 insw(ppb + 4, buffer, len >> 1);
364 else
365 insb(ppb + 4, buffer, len);
366 w_ctr(ppb, 0x2c);
367 r = !(r_str(ppb) & 0x01);
368 w_ctr(ppb, 0x2c);
369 ecp_sync(dev);
370 break;
371
372 default:
373 printk(KERN_ERR "PPA: bug in ppa_ins()\n");
374 r = 0;
375 break;
376 }
377 return r;
378}
379
380/* end of ppa_io.h */
381static inline void ppa_d_pulse(unsigned short ppb, unsigned char b)
382{
383 w_dtr(ppb, b);
384 w_ctr(ppb, 0xc);
385 w_ctr(ppb, 0xe);
386 w_ctr(ppb, 0xc);
387 w_ctr(ppb, 0x4);
388 w_ctr(ppb, 0xc);
389}
390
391static void ppa_disconnect(ppa_struct *dev)
392{
393 unsigned short ppb = dev->base;
394
395 ppa_d_pulse(ppb, 0);
396 ppa_d_pulse(ppb, 0x3c);
397 ppa_d_pulse(ppb, 0x20);
398 ppa_d_pulse(ppb, 0xf);
399}
400
401static inline void ppa_c_pulse(unsigned short ppb, unsigned char b)
402{
403 w_dtr(ppb, b);
404 w_ctr(ppb, 0x4);
405 w_ctr(ppb, 0x6);
406 w_ctr(ppb, 0x4);
407 w_ctr(ppb, 0xc);
408}
409
410static inline void ppa_connect(ppa_struct *dev, int flag)
411{
412 unsigned short ppb = dev->base;
413
414 ppa_c_pulse(ppb, 0);
415 ppa_c_pulse(ppb, 0x3c);
416 ppa_c_pulse(ppb, 0x20);
417 if ((flag == CONNECT_EPP_MAYBE) && IN_EPP_MODE(dev->mode))
418 ppa_c_pulse(ppb, 0xcf);
419 else
420 ppa_c_pulse(ppb, 0x8f);
421}
422
423static int ppa_select(ppa_struct *dev, int target)
424{
425 int k;
426 unsigned short ppb = dev->base;
427
428 /*
429 * Bit 6 (0x40) is the device selected bit.
430 * First we must wait till the current device goes off line...
431 */
432 k = PPA_SELECT_TMO;
433 do {
434 k--;
435 udelay(1);
436 } while ((r_str(ppb) & 0x40) && (k));
437 if (!k)
438 return 0;
439
440 w_dtr(ppb, (1 << target));
441 w_ctr(ppb, 0xe);
442 w_ctr(ppb, 0xc);
443 w_dtr(ppb, 0x80); /* This is NOT the initator */
444 w_ctr(ppb, 0x8);
445
446 k = PPA_SELECT_TMO;
447 do {
448 k--;
449 udelay(1);
450 }
451 while (!(r_str(ppb) & 0x40) && (k));
452 if (!k)
453 return 0;
454
455 return 1;
456}
457
458/*
459 * This is based on a trace of what the Iomega DOS 'guest' driver does.
460 * I've tried several different kinds of parallel ports with guest and
461 * coded this to react in the same ways that it does.
462 *
463 * The return value from this function is just a hint about where the
464 * handshaking failed.
465 *
466 */
467static int ppa_init(ppa_struct *dev)
468{
469 int retv;
470 unsigned short ppb = dev->base;
471 bool autodetect = dev->mode == PPA_AUTODETECT;
472
473 if (autodetect) {
474 int modes = dev->dev->port->modes;
475 int ppb_hi = dev->dev->port->base_hi;
476
477 /* Mode detection works up the chain of speed
478 * This avoids a nasty if-then-else-if-... tree
479 */
480 dev->mode = PPA_NIBBLE;
481
482 if (modes & PARPORT_MODE_TRISTATE)
483 dev->mode = PPA_PS2;
484
485 if (modes & PARPORT_MODE_ECP) {
486 w_ecr(ppb_hi, 0x20);
487 dev->mode = PPA_PS2;
488 }
489 if ((modes & PARPORT_MODE_EPP) && (modes & PARPORT_MODE_ECP))
490 w_ecr(ppb_hi, 0x80);
491 }
492
493 ppa_disconnect(dev);
494 ppa_connect(dev, CONNECT_NORMAL);
495
496 retv = 2; /* Failed */
497
498 w_ctr(ppb, 0xe);
499 if ((r_str(ppb) & 0x08) == 0x08)
500 retv--;
501
502 w_ctr(ppb, 0xc);
503 if ((r_str(ppb) & 0x08) == 0x00)
504 retv--;
505
506 if (!retv)
507 ppa_reset_pulse(ppb);
508 udelay(1000); /* Allow devices to settle down */
509 ppa_disconnect(dev);
510 udelay(1000); /* Another delay to allow devices to settle */
511
512 if (retv)
513 return -EIO;
514
515 return device_check(dev, autodetect);
516}
517
518static inline int ppa_send_command(struct scsi_cmnd *cmd)
519{
520 ppa_struct *dev = ppa_dev(cmd->device->host);
521 int k;
522
523 w_ctr(dev->base, 0x0c);
524
525 for (k = 0; k < cmd->cmd_len; k++)
526 if (!ppa_out(dev, &cmd->cmnd[k], 1))
527 return 0;
528 return 1;
529}
530
531/*
532 * The bulk flag enables some optimisations in the data transfer loops,
533 * it should be true for any command that transfers data in integral
534 * numbers of sectors.
535 *
536 * The driver appears to remain stable if we speed up the parallel port
537 * i/o in this function, but not elsewhere.
538 */
539static int ppa_completion(struct scsi_cmnd *const cmd)
540{
541 /* Return codes:
542 * -1 Error
543 * 0 Told to schedule
544 * 1 Finished data transfer
545 */
546 struct scsi_pointer *scsi_pointer = ppa_scsi_pointer(cmd);
547 ppa_struct *dev = ppa_dev(cmd->device->host);
548 unsigned short ppb = dev->base;
549 unsigned long start_jiffies = jiffies;
550
551 unsigned char r, v;
552 int fast, bulk, status;
553
554 v = cmd->cmnd[0];
555 bulk = ((v == READ_6) ||
556 (v == READ_10) || (v == WRITE_6) || (v == WRITE_10));
557
558 /*
559 * We only get here if the drive is ready to comunicate,
560 * hence no need for a full ppa_wait.
561 */
562 r = (r_str(ppb) & 0xf0);
563
564 while (r != (unsigned char) 0xf0) {
565 /*
566 * If we have been running for more than a full timer tick
567 * then take a rest.
568 */
569 if (time_after(jiffies, start_jiffies + 1))
570 return 0;
571
572 if (scsi_pointer->this_residual <= 0) {
573 ppa_fail(dev, DID_ERROR);
574 return -1; /* ERROR_RETURN */
575 }
576
577 /* On some hardware we have SCSI disconnected (6th bit low)
578 * for about 100usecs. It is too expensive to wait a
579 * tick on every loop so we busy wait for no more than
580 * 500usecs to give the drive a chance first. We do not
581 * change things for "normal" hardware since generally
582 * the 6th bit is always high.
583 * This makes the CPU load higher on some hardware
584 * but otherwise we can not get more than 50K/secs
585 * on this problem hardware.
586 */
587 if ((r & 0xc0) != 0xc0) {
588 /* Wait for reconnection should be no more than
589 * jiffy/2 = 5ms = 5000 loops
590 */
591 unsigned long k = dev->recon_tmo;
592 for (; k && ((r = (r_str(ppb) & 0xf0)) & 0xc0) != 0xc0;
593 k--)
594 udelay(1);
595
596 if (!k)
597 return 0;
598 }
599
600 /* determine if we should use burst I/O */
601 fast = bulk && scsi_pointer->this_residual >= PPA_BURST_SIZE ?
602 PPA_BURST_SIZE : 1;
603
604 if (r == (unsigned char) 0xc0)
605 status = ppa_out(dev, scsi_pointer->ptr, fast);
606 else
607 status = ppa_in(dev, scsi_pointer->ptr, fast);
608
609 scsi_pointer->ptr += fast;
610 scsi_pointer->this_residual -= fast;
611
612 if (!status) {
613 ppa_fail(dev, DID_BUS_BUSY);
614 return -1; /* ERROR_RETURN */
615 }
616 if (scsi_pointer->buffer && !scsi_pointer->this_residual) {
617 /* if scatter/gather, advance to the next segment */
618 if (scsi_pointer->buffers_residual--) {
619 scsi_pointer->buffer =
620 sg_next(scsi_pointer->buffer);
621 scsi_pointer->this_residual =
622 scsi_pointer->buffer->length;
623 scsi_pointer->ptr =
624 sg_virt(scsi_pointer->buffer);
625 }
626 }
627 /* Now check to see if the drive is ready to comunicate */
628 r = (r_str(ppb) & 0xf0);
629 /* If not, drop back down to the scheduler and wait a timer tick */
630 if (!(r & 0x80))
631 return 0;
632 }
633 return 1; /* FINISH_RETURN */
634}
635
636/*
637 * Since the PPA itself doesn't generate interrupts, we use
638 * the scheduler's task queue to generate a stream of call-backs and
639 * complete the request when the drive is ready.
640 */
641static void ppa_interrupt(struct work_struct *work)
642{
643 ppa_struct *dev = container_of(work, ppa_struct, ppa_tq.work);
644 struct scsi_cmnd *cmd = dev->cur_cmd;
645
646 if (!cmd) {
647 printk(KERN_ERR "PPA: bug in ppa_interrupt\n");
648 return;
649 }
650 if (ppa_engine(dev, cmd)) {
651 schedule_delayed_work(&dev->ppa_tq, 1);
652 return;
653 }
654 /* Command must of completed hence it is safe to let go... */
655#if PPA_DEBUG > 0
656 switch ((cmd->result >> 16) & 0xff) {
657 case DID_OK:
658 break;
659 case DID_NO_CONNECT:
660 printk(KERN_DEBUG "ppa: no device at SCSI ID %i\n", scmd_id(cmd));
661 break;
662 case DID_BUS_BUSY:
663 printk(KERN_DEBUG "ppa: BUS BUSY - EPP timeout detected\n");
664 break;
665 case DID_TIME_OUT:
666 printk(KERN_DEBUG "ppa: unknown timeout\n");
667 break;
668 case DID_ABORT:
669 printk(KERN_DEBUG "ppa: told to abort\n");
670 break;
671 case DID_PARITY:
672 printk(KERN_DEBUG "ppa: parity error (???)\n");
673 break;
674 case DID_ERROR:
675 printk(KERN_DEBUG "ppa: internal driver error\n");
676 break;
677 case DID_RESET:
678 printk(KERN_DEBUG "ppa: told to reset device\n");
679 break;
680 case DID_BAD_INTR:
681 printk(KERN_WARNING "ppa: bad interrupt (???)\n");
682 break;
683 default:
684 printk(KERN_WARNING "ppa: bad return code (%02x)\n",
685 (cmd->result >> 16) & 0xff);
686 }
687#endif
688
689 if (ppa_scsi_pointer(cmd)->phase > 1)
690 ppa_disconnect(dev);
691
692 ppa_pb_dismiss(dev);
693
694 dev->cur_cmd = NULL;
695
696 scsi_done(cmd);
697}
698
699static int ppa_engine(ppa_struct *dev, struct scsi_cmnd *cmd)
700{
701 struct scsi_pointer *scsi_pointer = ppa_scsi_pointer(cmd);
702 unsigned short ppb = dev->base;
703 unsigned char l = 0, h = 0;
704 int retv;
705
706 /* First check for any errors that may of occurred
707 * Here we check for internal errors
708 */
709 if (dev->failed)
710 return 0;
711
712 switch (scsi_pointer->phase) {
713 case 0: /* Phase 0 - Waiting for parport */
714 if (time_after(jiffies, dev->jstart + HZ)) {
715 /*
716 * We waited more than a second
717 * for parport to call us
718 */
719 ppa_fail(dev, DID_BUS_BUSY);
720 return 0;
721 }
722 return 1; /* wait until ppa_wakeup claims parport */
723 case 1: /* Phase 1 - Connected */
724 { /* Perform a sanity check for cable unplugged */
725 int retv = 2; /* Failed */
726
727 ppa_connect(dev, CONNECT_EPP_MAYBE);
728
729 w_ctr(ppb, 0xe);
730 if ((r_str(ppb) & 0x08) == 0x08)
731 retv--;
732
733 w_ctr(ppb, 0xc);
734 if ((r_str(ppb) & 0x08) == 0x00)
735 retv--;
736
737 if (retv) {
738 if (time_after(jiffies, dev->jstart + (1 * HZ))) {
739 printk(KERN_ERR "ppa: Parallel port cable is unplugged.\n");
740 ppa_fail(dev, DID_BUS_BUSY);
741 return 0;
742 } else {
743 ppa_disconnect(dev);
744 return 1; /* Try again in a jiffy */
745 }
746 }
747 scsi_pointer->phase++;
748 }
749 fallthrough;
750
751 case 2: /* Phase 2 - We are now talking to the scsi bus */
752 if (!ppa_select(dev, scmd_id(cmd))) {
753 ppa_fail(dev, DID_NO_CONNECT);
754 return 0;
755 }
756 scsi_pointer->phase++;
757 fallthrough;
758
759 case 3: /* Phase 3 - Ready to accept a command */
760 w_ctr(ppb, 0x0c);
761 if (!(r_str(ppb) & 0x80))
762 return 1;
763
764 if (!ppa_send_command(cmd))
765 return 0;
766 scsi_pointer->phase++;
767 fallthrough;
768
769 case 4: /* Phase 4 - Setup scatter/gather buffers */
770 if (scsi_bufflen(cmd)) {
771 scsi_pointer->buffer = scsi_sglist(cmd);
772 scsi_pointer->this_residual =
773 scsi_pointer->buffer->length;
774 scsi_pointer->ptr = sg_virt(scsi_pointer->buffer);
775 } else {
776 scsi_pointer->buffer = NULL;
777 scsi_pointer->this_residual = 0;
778 scsi_pointer->ptr = NULL;
779 }
780 scsi_pointer->buffers_residual = scsi_sg_count(cmd) - 1;
781 scsi_pointer->phase++;
782 fallthrough;
783
784 case 5: /* Phase 5 - Data transfer stage */
785 w_ctr(ppb, 0x0c);
786 if (!(r_str(ppb) & 0x80))
787 return 1;
788
789 retv = ppa_completion(cmd);
790 if (retv == -1)
791 return 0;
792 if (retv == 0)
793 return 1;
794 scsi_pointer->phase++;
795 fallthrough;
796
797 case 6: /* Phase 6 - Read status/message */
798 cmd->result = DID_OK << 16;
799 /* Check for data overrun */
800 if (ppa_wait(dev) != (unsigned char) 0xf0) {
801 ppa_fail(dev, DID_ERROR);
802 return 0;
803 }
804 if (ppa_in(dev, &l, 1)) { /* read status byte */
805 /* Check for optional message byte */
806 if (ppa_wait(dev) == (unsigned char) 0xf0)
807 ppa_in(dev, &h, 1);
808 cmd->result =
809 (DID_OK << 16) + (h << 8) + (l & STATUS_MASK);
810 }
811 return 0; /* Finished */
812
813 default:
814 printk(KERN_ERR "ppa: Invalid scsi phase\n");
815 }
816 return 0;
817}
818
819static int ppa_queuecommand_lck(struct scsi_cmnd *cmd)
820{
821 ppa_struct *dev = ppa_dev(cmd->device->host);
822
823 if (dev->cur_cmd) {
824 printk(KERN_ERR "PPA: bug in ppa_queuecommand\n");
825 return 0;
826 }
827 dev->failed = 0;
828 dev->jstart = jiffies;
829 dev->cur_cmd = cmd;
830 cmd->result = DID_ERROR << 16; /* default return code */
831 ppa_scsi_pointer(cmd)->phase = 0; /* bus free */
832
833 schedule_delayed_work(&dev->ppa_tq, 0);
834
835 ppa_pb_claim(dev);
836
837 return 0;
838}
839
840static DEF_SCSI_QCMD(ppa_queuecommand)
841
842/*
843 * Apparently the disk->capacity attribute is off by 1 sector
844 * for all disk drives. We add the one here, but it should really
845 * be done in sd.c. Even if it gets fixed there, this will still
846 * work.
847 */
848static int ppa_biosparam(struct scsi_device *sdev, struct block_device *dev,
849 sector_t capacity, int ip[])
850{
851 ip[0] = 0x40;
852 ip[1] = 0x20;
853 ip[2] = ((unsigned long) capacity + 1) / (ip[0] * ip[1]);
854 if (ip[2] > 1024) {
855 ip[0] = 0xff;
856 ip[1] = 0x3f;
857 ip[2] = ((unsigned long) capacity + 1) / (ip[0] * ip[1]);
858 if (ip[2] > 1023)
859 ip[2] = 1023;
860 }
861 return 0;
862}
863
864static int ppa_abort(struct scsi_cmnd *cmd)
865{
866 ppa_struct *dev = ppa_dev(cmd->device->host);
867 /*
868 * There is no method for aborting commands since Iomega
869 * have tied the SCSI_MESSAGE line high in the interface
870 */
871
872 switch (ppa_scsi_pointer(cmd)->phase) {
873 case 0: /* Do not have access to parport */
874 case 1: /* Have not connected to interface */
875 dev->cur_cmd = NULL; /* Forget the problem */
876 return SUCCESS;
877 default: /* SCSI command sent, can not abort */
878 return FAILED;
879 }
880}
881
882static void ppa_reset_pulse(unsigned int base)
883{
884 w_dtr(base, 0x40);
885 w_ctr(base, 0x8);
886 udelay(30);
887 w_ctr(base, 0xc);
888}
889
890static int ppa_reset(struct scsi_cmnd *cmd)
891{
892 ppa_struct *dev = ppa_dev(cmd->device->host);
893
894 if (ppa_scsi_pointer(cmd)->phase)
895 ppa_disconnect(dev);
896 dev->cur_cmd = NULL; /* Forget the problem */
897
898 ppa_connect(dev, CONNECT_NORMAL);
899 ppa_reset_pulse(dev->base);
900 mdelay(1); /* device settle delay */
901 ppa_disconnect(dev);
902 mdelay(1); /* device settle delay */
903 return SUCCESS;
904}
905
906static int device_check(ppa_struct *dev, bool autodetect)
907{
908 /* This routine looks for a device and then attempts to use EPP
909 to send a command. If all goes as planned then EPP is available. */
910
911 static u8 cmd[6] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
912 int loop, old_mode, status, k, ppb = dev->base;
913 unsigned char l;
914
915 old_mode = dev->mode;
916 for (loop = 0; loop < 8; loop++) {
917 /* Attempt to use EPP for Test Unit Ready */
918 if (autodetect && (ppb & 0x0007) == 0x0000)
919 dev->mode = PPA_EPP_8;
920
921second_pass:
922 ppa_connect(dev, CONNECT_EPP_MAYBE);
923 /* Select SCSI device */
924 if (!ppa_select(dev, loop)) {
925 ppa_disconnect(dev);
926 continue;
927 }
928 printk(KERN_INFO "ppa: Found device at ID %i, Attempting to use %s\n",
929 loop, PPA_MODE_STRING[dev->mode]);
930
931 /* Send SCSI command */
932 status = 1;
933 w_ctr(ppb, 0x0c);
934 for (l = 0; (l < 6) && (status); l++)
935 status = ppa_out(dev, cmd, 1);
936
937 if (!status) {
938 ppa_disconnect(dev);
939 ppa_connect(dev, CONNECT_EPP_MAYBE);
940 w_dtr(ppb, 0x40);
941 w_ctr(ppb, 0x08);
942 udelay(30);
943 w_ctr(ppb, 0x0c);
944 udelay(1000);
945 ppa_disconnect(dev);
946 udelay(1000);
947 if (dev->mode != old_mode) {
948 dev->mode = old_mode;
949 goto second_pass;
950 }
951 return -EIO;
952 }
953 w_ctr(ppb, 0x0c);
954 k = 1000000; /* 1 Second */
955 do {
956 l = r_str(ppb);
957 k--;
958 udelay(1);
959 } while (!(l & 0x80) && (k));
960
961 l &= 0xf0;
962
963 if (l != 0xf0) {
964 ppa_disconnect(dev);
965 ppa_connect(dev, CONNECT_EPP_MAYBE);
966 ppa_reset_pulse(ppb);
967 udelay(1000);
968 ppa_disconnect(dev);
969 udelay(1000);
970 if (dev->mode != old_mode) {
971 dev->mode = old_mode;
972 goto second_pass;
973 }
974 return -EIO;
975 }
976 ppa_disconnect(dev);
977 printk(KERN_INFO "ppa: Communication established with ID %i using %s\n",
978 loop, PPA_MODE_STRING[dev->mode]);
979 ppa_connect(dev, CONNECT_EPP_MAYBE);
980 ppa_reset_pulse(ppb);
981 udelay(1000);
982 ppa_disconnect(dev);
983 udelay(1000);
984 return 0;
985 }
986 return -ENODEV;
987}
988
989static const struct scsi_host_template ppa_template = {
990 .module = THIS_MODULE,
991 .proc_name = "ppa",
992 .show_info = ppa_show_info,
993 .write_info = ppa_write_info,
994 .name = "Iomega VPI0 (ppa) interface",
995 .queuecommand = ppa_queuecommand,
996 .eh_abort_handler = ppa_abort,
997 .eh_host_reset_handler = ppa_reset,
998 .bios_param = ppa_biosparam,
999 .this_id = -1,
1000 .sg_tablesize = SG_ALL,
1001 .can_queue = 1,
1002 .cmd_size = sizeof(struct scsi_pointer),
1003};
1004
1005/***************************************************************************
1006 * Parallel port probing routines *
1007 ***************************************************************************/
1008
1009static LIST_HEAD(ppa_hosts);
1010
1011/*
1012 * Finds the first available device number that can be alloted to the
1013 * new ppa device and returns the address of the previous node so that
1014 * we can add to the tail and have a list in the ascending order.
1015 */
1016
1017static inline ppa_struct *find_parent(void)
1018{
1019 ppa_struct *dev, *par = NULL;
1020 unsigned int cnt = 0;
1021
1022 if (list_empty(&ppa_hosts))
1023 return NULL;
1024
1025 list_for_each_entry(dev, &ppa_hosts, list) {
1026 if (dev->dev_no != cnt)
1027 return par;
1028 cnt++;
1029 par = dev;
1030 }
1031
1032 return par;
1033}
1034
1035static int __ppa_attach(struct parport *pb)
1036{
1037 struct Scsi_Host *host;
1038 DECLARE_WAIT_QUEUE_HEAD_ONSTACK(waiting);
1039 DEFINE_WAIT(wait);
1040 ppa_struct *dev, *temp;
1041 int ports;
1042 int err = -ENOMEM;
1043 struct pardev_cb ppa_cb;
1044
1045 dev = kzalloc(sizeof(ppa_struct), GFP_KERNEL);
1046 if (!dev)
1047 return -ENOMEM;
1048 dev->base = -1;
1049 dev->mode = mode < PPA_UNKNOWN ? mode : PPA_AUTODETECT;
1050 dev->recon_tmo = PPA_RECON_TMO;
1051 init_waitqueue_head(&waiting);
1052 temp = find_parent();
1053 if (temp)
1054 dev->dev_no = temp->dev_no + 1;
1055
1056 memset(&ppa_cb, 0, sizeof(ppa_cb));
1057 ppa_cb.private = dev;
1058 ppa_cb.wakeup = ppa_wakeup;
1059
1060 dev->dev = parport_register_dev_model(pb, "ppa", &ppa_cb, dev->dev_no);
1061
1062 if (!dev->dev)
1063 goto out;
1064
1065 /* Claim the bus so it remembers what we do to the control
1066 * registers. [ CTR and ECP ]
1067 */
1068 err = -EBUSY;
1069 dev->waiting = &waiting;
1070 prepare_to_wait(&waiting, &wait, TASK_UNINTERRUPTIBLE);
1071 if (ppa_pb_claim(dev))
1072 schedule_timeout(3 * HZ);
1073 if (dev->wanted) {
1074 printk(KERN_ERR "ppa%d: failed to claim parport because "
1075 "a pardevice is owning the port for too long "
1076 "time!\n", pb->number);
1077 ppa_pb_dismiss(dev);
1078 dev->waiting = NULL;
1079 finish_wait(&waiting, &wait);
1080 goto out1;
1081 }
1082 dev->waiting = NULL;
1083 finish_wait(&waiting, &wait);
1084 dev->base = dev->dev->port->base;
1085 w_ctr(dev->base, 0x0c);
1086
1087 /* Done configuration */
1088
1089 err = ppa_init(dev);
1090 ppa_pb_release(dev);
1091
1092 if (err)
1093 goto out1;
1094
1095 /* now the glue ... */
1096 if (dev->mode == PPA_NIBBLE || dev->mode == PPA_PS2)
1097 ports = 3;
1098 else
1099 ports = 8;
1100
1101 INIT_DELAYED_WORK(&dev->ppa_tq, ppa_interrupt);
1102
1103 err = -ENOMEM;
1104 host = scsi_host_alloc(&ppa_template, sizeof(ppa_struct *));
1105 if (!host)
1106 goto out1;
1107 host->no_highmem = true;
1108 host->io_port = pb->base;
1109 host->n_io_port = ports;
1110 host->dma_channel = -1;
1111 host->unique_id = pb->number;
1112 *(ppa_struct **)&host->hostdata = dev;
1113 dev->host = host;
1114 list_add_tail(&dev->list, &ppa_hosts);
1115 err = scsi_add_host(host, NULL);
1116 if (err)
1117 goto out2;
1118 scsi_scan_host(host);
1119 return 0;
1120out2:
1121 list_del_init(&dev->list);
1122 scsi_host_put(host);
1123out1:
1124 parport_unregister_device(dev->dev);
1125out:
1126 kfree(dev);
1127 return err;
1128}
1129
1130static void ppa_attach(struct parport *pb)
1131{
1132 __ppa_attach(pb);
1133}
1134
1135static void ppa_detach(struct parport *pb)
1136{
1137 ppa_struct *dev;
1138 list_for_each_entry(dev, &ppa_hosts, list) {
1139 if (dev->dev->port == pb) {
1140 list_del_init(&dev->list);
1141 scsi_remove_host(dev->host);
1142 scsi_host_put(dev->host);
1143 parport_unregister_device(dev->dev);
1144 kfree(dev);
1145 break;
1146 }
1147 }
1148}
1149
1150static struct parport_driver ppa_driver = {
1151 .name = "ppa",
1152 .match_port = ppa_attach,
1153 .detach = ppa_detach,
1154};
1155module_parport_driver(ppa_driver);
1156
1157MODULE_DESCRIPTION("IOMEGA PPA3 parallel port SCSI host adapter driver");
1158MODULE_LICENSE("GPL");