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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 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 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 * Start of Chipset kludges
112 */
113
114/* This is to give the ppa driver a way to modify the timings (and other
115 * parameters) by writing to the /proc/scsi/ppa/0 file.
116 * Very simple method really... (To simple, no error checking :( )
117 * Reason: Kernel hackers HATE having to unload and reload modules for
118 * testing...
119 * Also gives a method to use a script to obtain optimum timings (TODO)
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 /* If we fail a device then we trash status / message bytes */
166 if (dev->cur_cmd) {
167 dev->cur_cmd->result = error_code << 16;
168 dev->failed = 1;
169 }
170}
171
172/*
173 * Wait for the high bit to be set.
174 *
175 * In principle, this could be tied to an interrupt, but the adapter
176 * doesn't appear to be designed to support interrupts. We spin on
177 * the 0x80 ready bit.
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 /* Wait for bit 6 and 7 - PJC */
187 for (r = r_str(ppb); ((r & 0xc0) != 0xc0) && (k); k--) {
188 udelay(1);
189 r = r_str(ppb);
190 }
191
192 /*
193 * return some status information.
194 * Semantics: 0xc0 = ZIP wants more data
195 * 0xd0 = ZIP wants to send more data
196 * 0xe0 = ZIP is expecting SCSI command data
197 * 0xf0 = end of transfer, ZIP is sending status
198 */
199 if (k)
200 return (r & 0xf0);
201
202 /* Counter expired - Time out occurred */
203 ppa_fail(dev, DID_TIME_OUT);
204 printk(KERN_WARNING "ppa timeout in ppa_wait\n");
205 return 0; /* command timed out */
206}
207
208/*
209 * Clear EPP Timeout Bit
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 * Wait for empty ECP fifo (if we are in ECP fifo mode only)
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) { /* mode 011 == ECP fifo mode */
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; /* All went well - we hope! */
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; /* All went well - we hope! */
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; /* All went well - we hope! */
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 /* 8 bit output, with a loop */
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 /* 4 bit input, with a loop */
336 r = ppa_nibble_in(ppb, buffer, len);
337 w_ctr(ppb, 0xc);
338 break;
339
340 case PPA_PS2:
341 /* 8 bit input, with a loop */
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/* end of ppa_io.h */
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 * Bit 6 (0x40) is the device selected bit.
426 * First we must wait till the current device goes off line...
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); /* This is NOT the initator */
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 * This is based on a trace of what the Iomega DOS 'guest' driver does.
456 * I've tried several different kinds of parallel ports with guest and
457 * coded this to react in the same ways that it does.
458 *
459 * The return value from this function is just a hint about where the
460 * handshaking failed.
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; /* Failed */
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); /* Allow devices to settle down */
484 ppa_disconnect(dev);
485 udelay(1000); /* Another delay to allow devices to settle */
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 * The bulk flag enables some optimisations in the data transfer loops,
508 * it should be true for any command that transfers data in integral
509 * numbers of sectors.
510 *
511 * The driver appears to remain stable if we speed up the parallel port
512 * i/o in this function, but not elsewhere.
513 */
514static int ppa_completion(struct scsi_cmnd *cmd)
515{
516 /* Return codes:
517 * -1 Error
518 * 0 Told to schedule
519 * 1 Finished data transfer
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 * We only get here if the drive is ready to comunicate,
534 * hence no need for a full ppa_wait.
535 */
536 r = (r_str(ppb) & 0xf0);
537
538 while (r != (unsigned char) 0xf0) {
539 /*
540 * If we have been running for more than a full timer tick
541 * then take a rest.
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; /* ERROR_RETURN */
549 }
550
551 /* On some hardware we have SCSI disconnected (6th bit low)
552 * for about 100usecs. It is too expensive to wait a
553 * tick on every loop so we busy wait for no more than
554 * 500usecs to give the drive a chance first. We do not
555 * change things for "normal" hardware since generally
556 * the 6th bit is always high.
557 * This makes the CPU load higher on some hardware
558 * but otherwise we can not get more than 50K/secs
559 * on this problem hardware.
560 */
561 if ((r & 0xc0) != 0xc0) {
562 /* Wait for reconnection should be no more than
563 * jiffy/2 = 5ms = 5000 loops
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 /* determine if we should use burst I/O */
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; /* ERROR_RETURN */
589 }
590 if (cmd->SCp.buffer && !cmd->SCp.this_residual) {
591 /* if scatter/gather, advance to the next segment */
592 if (cmd->SCp.buffers_residual--) {
593 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 /* Now check to see if the drive is ready to comunicate */
600 r = (r_str(ppb) & 0xf0);
601 /* If not, drop back down to the scheduler and wait a timer tick */
602 if (!(r & 0x80))
603 return 0;
604 }
605 return 1; /* FINISH_RETURN */
606}
607
608/*
609 * Since the PPA itself doesn't generate interrupts, we use
610 * the scheduler's task queue to generate a stream of call-backs and
611 * complete the request when the drive is ready.
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 /* Command must of completed hence it is safe to let go... */
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 /* First check for any errors that may of occurred
678 * Here we check for internal errors
679 */
680 if (dev->failed)
681 return 0;
682
683 switch (cmd->SCp.phase) {
684 case 0: /* Phase 0 - Waiting for parport */
685 if (time_after(jiffies, dev->jstart + HZ)) {
686 /*
687 * We waited more than a second
688 * for parport to call us
689 */
690 ppa_fail(dev, DID_BUS_BUSY);
691 return 0;
692 }
693 return 1; /* wait until ppa_wakeup claims parport */
694 case 1: /* Phase 1 - Connected */
695 { /* Perform a sanity check for cable unplugged */
696 int retv = 2; /* Failed */
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; /* Try again in a jiffy */
716 }
717 }
718 cmd->SCp.phase++;
719 }
720
721 case 2: /* Phase 2 - We are now talking to the scsi bus */
722 if (!ppa_select(dev, scmd_id(cmd))) {
723 ppa_fail(dev, DID_NO_CONNECT);
724 return 0;
725 }
726 cmd->SCp.phase++;
727 /* fall through */
728
729 case 3: /* Phase 3 - Ready to accept a command */
730 w_ctr(ppb, 0x0c);
731 if (!(r_str(ppb) & 0x80))
732 return 1;
733
734 if (!ppa_send_command(cmd))
735 return 0;
736 cmd->SCp.phase++;
737 /* fall through */
738
739 case 4: /* Phase 4 - Setup scatter/gather buffers */
740 if (scsi_bufflen(cmd)) {
741 cmd->SCp.buffer = scsi_sglist(cmd);
742 cmd->SCp.this_residual = cmd->SCp.buffer->length;
743 cmd->SCp.ptr = sg_virt(cmd->SCp.buffer);
744 } else {
745 cmd->SCp.buffer = NULL;
746 cmd->SCp.this_residual = 0;
747 cmd->SCp.ptr = NULL;
748 }
749 cmd->SCp.buffers_residual = scsi_sg_count(cmd) - 1;
750 cmd->SCp.phase++;
751 /* fall through */
752
753 case 5: /* Phase 5 - Data transfer stage */
754 w_ctr(ppb, 0x0c);
755 if (!(r_str(ppb) & 0x80))
756 return 1;
757
758 retv = ppa_completion(cmd);
759 if (retv == -1)
760 return 0;
761 if (retv == 0)
762 return 1;
763 cmd->SCp.phase++;
764 /* fall through */
765
766 case 6: /* Phase 6 - Read status/message */
767 cmd->result = DID_OK << 16;
768 /* Check for data overrun */
769 if (ppa_wait(dev) != (unsigned char) 0xf0) {
770 ppa_fail(dev, DID_ERROR);
771 return 0;
772 }
773 if (ppa_in(dev, &l, 1)) { /* read status byte */
774 /* Check for optional message byte */
775 if (ppa_wait(dev) == (unsigned char) 0xf0)
776 ppa_in(dev, &h, 1);
777 cmd->result =
778 (DID_OK << 16) + (h << 8) + (l & STATUS_MASK);
779 }
780 return 0; /* Finished */
781 break;
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; /* default return code */
803 cmd->SCp.phase = 0; /* bus free */
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 * Apparently the disk->capacity attribute is off by 1 sector
816 * for all disk drives. We add the one here, but it should really
817 * be done in sd.c. Even if it gets fixed there, this will still
818 * work.
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 * There is no method for aborting commands since Iomega
841 * have tied the SCSI_MESSAGE line high in the interface
842 */
843
844 switch (cmd->SCp.phase) {
845 case 0: /* Do not have access to parport */
846 case 1: /* Have not connected to interface */
847 dev->cur_cmd = NULL; /* Forget the problem */
848 return SUCCESS;
849 break;
850 default: /* SCSI command sent, can not abort */
851 return FAILED;
852 break;
853 }
854}
855
856static void ppa_reset_pulse(unsigned int base)
857{
858 w_dtr(base, 0x40);
859 w_ctr(base, 0x8);
860 udelay(30);
861 w_ctr(base, 0xc);
862}
863
864static int ppa_reset(struct scsi_cmnd *cmd)
865{
866 ppa_struct *dev = ppa_dev(cmd->device->host);
867
868 if (cmd->SCp.phase)
869 ppa_disconnect(dev);
870 dev->cur_cmd = NULL; /* Forget the problem */
871
872 ppa_connect(dev, CONNECT_NORMAL);
873 ppa_reset_pulse(dev->base);
874 mdelay(1); /* device settle delay */
875 ppa_disconnect(dev);
876 mdelay(1); /* device settle delay */
877 return SUCCESS;
878}
879
880static int device_check(ppa_struct *dev)
881{
882 /* This routine looks for a device and then attempts to use EPP
883 to send a command. If all goes as planned then EPP is available. */
884
885 static u8 cmd[6] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
886 int loop, old_mode, status, k, ppb = dev->base;
887 unsigned char l;
888
889 old_mode = dev->mode;
890 for (loop = 0; loop < 8; loop++) {
891 /* Attempt to use EPP for Test Unit Ready */
892 if ((ppb & 0x0007) == 0x0000)
893 dev->mode = PPA_EPP_32;
894
895second_pass:
896 ppa_connect(dev, CONNECT_EPP_MAYBE);
897 /* Select SCSI device */
898 if (!ppa_select(dev, loop)) {
899 ppa_disconnect(dev);
900 continue;
901 }
902 printk(KERN_INFO "ppa: Found device at ID %i, Attempting to use %s\n",
903 loop, PPA_MODE_STRING[dev->mode]);
904
905 /* Send SCSI command */
906 status = 1;
907 w_ctr(ppb, 0x0c);
908 for (l = 0; (l < 6) && (status); l++)
909 status = ppa_out(dev, cmd, 1);
910
911 if (!status) {
912 ppa_disconnect(dev);
913 ppa_connect(dev, CONNECT_EPP_MAYBE);
914 w_dtr(ppb, 0x40);
915 w_ctr(ppb, 0x08);
916 udelay(30);
917 w_ctr(ppb, 0x0c);
918 udelay(1000);
919 ppa_disconnect(dev);
920 udelay(1000);
921 if (dev->mode == PPA_EPP_32) {
922 dev->mode = old_mode;
923 goto second_pass;
924 }
925 return -EIO;
926 }
927 w_ctr(ppb, 0x0c);
928 k = 1000000; /* 1 Second */
929 do {
930 l = r_str(ppb);
931 k--;
932 udelay(1);
933 } while (!(l & 0x80) && (k));
934
935 l &= 0xf0;
936
937 if (l != 0xf0) {
938 ppa_disconnect(dev);
939 ppa_connect(dev, CONNECT_EPP_MAYBE);
940 ppa_reset_pulse(ppb);
941 udelay(1000);
942 ppa_disconnect(dev);
943 udelay(1000);
944 if (dev->mode == PPA_EPP_32) {
945 dev->mode = old_mode;
946 goto second_pass;
947 }
948 return -EIO;
949 }
950 ppa_disconnect(dev);
951 printk(KERN_INFO "ppa: Communication established with ID %i using %s\n",
952 loop, PPA_MODE_STRING[dev->mode]);
953 ppa_connect(dev, CONNECT_EPP_MAYBE);
954 ppa_reset_pulse(ppb);
955 udelay(1000);
956 ppa_disconnect(dev);
957 udelay(1000);
958 return 0;
959 }
960 return -ENODEV;
961}
962
963static int ppa_adjust_queue(struct scsi_device *device)
964{
965 blk_queue_bounce_limit(device->request_queue, BLK_BOUNCE_HIGH);
966 return 0;
967}
968
969static struct scsi_host_template ppa_template = {
970 .module = THIS_MODULE,
971 .proc_name = "ppa",
972 .show_info = ppa_show_info,
973 .write_info = ppa_write_info,
974 .name = "Iomega VPI0 (ppa) interface",
975 .queuecommand = ppa_queuecommand,
976 .eh_abort_handler = ppa_abort,
977 .eh_host_reset_handler = ppa_reset,
978 .bios_param = ppa_biosparam,
979 .this_id = -1,
980 .sg_tablesize = SG_ALL,
981 .use_clustering = ENABLE_CLUSTERING,
982 .can_queue = 1,
983 .slave_alloc = ppa_adjust_queue,
984};
985
986/***************************************************************************
987 * Parallel port probing routines *
988 ***************************************************************************/
989
990static LIST_HEAD(ppa_hosts);
991
992/*
993 * Finds the first available device number that can be alloted to the
994 * new ppa device and returns the address of the previous node so that
995 * we can add to the tail and have a list in the ascending order.
996 */
997
998static inline ppa_struct *find_parent(void)
999{
1000 ppa_struct *dev, *par = NULL;
1001 unsigned int cnt = 0;
1002
1003 if (list_empty(&ppa_hosts))
1004 return NULL;
1005
1006 list_for_each_entry(dev, &ppa_hosts, list) {
1007 if (dev->dev_no != cnt)
1008 return par;
1009 cnt++;
1010 par = dev;
1011 }
1012
1013 return par;
1014}
1015
1016static int __ppa_attach(struct parport *pb)
1017{
1018 struct Scsi_Host *host;
1019 DECLARE_WAIT_QUEUE_HEAD_ONSTACK(waiting);
1020 DEFINE_WAIT(wait);
1021 ppa_struct *dev, *temp;
1022 int ports;
1023 int modes, ppb, ppb_hi;
1024 int err = -ENOMEM;
1025 struct pardev_cb ppa_cb;
1026
1027 dev = kzalloc(sizeof(ppa_struct), GFP_KERNEL);
1028 if (!dev)
1029 return -ENOMEM;
1030 dev->base = -1;
1031 dev->mode = PPA_AUTODETECT;
1032 dev->recon_tmo = PPA_RECON_TMO;
1033 init_waitqueue_head(&waiting);
1034 temp = find_parent();
1035 if (temp)
1036 dev->dev_no = temp->dev_no + 1;
1037
1038 memset(&ppa_cb, 0, sizeof(ppa_cb));
1039 ppa_cb.private = dev;
1040 ppa_cb.wakeup = ppa_wakeup;
1041
1042 dev->dev = parport_register_dev_model(pb, "ppa", &ppa_cb, dev->dev_no);
1043
1044 if (!dev->dev)
1045 goto out;
1046
1047 /* Claim the bus so it remembers what we do to the control
1048 * registers. [ CTR and ECP ]
1049 */
1050 err = -EBUSY;
1051 dev->waiting = &waiting;
1052 prepare_to_wait(&waiting, &wait, TASK_UNINTERRUPTIBLE);
1053 if (ppa_pb_claim(dev))
1054 schedule_timeout(3 * HZ);
1055 if (dev->wanted) {
1056 printk(KERN_ERR "ppa%d: failed to claim parport because "
1057 "a pardevice is owning the port for too long "
1058 "time!\n", pb->number);
1059 ppa_pb_dismiss(dev);
1060 dev->waiting = NULL;
1061 finish_wait(&waiting, &wait);
1062 goto out1;
1063 }
1064 dev->waiting = NULL;
1065 finish_wait(&waiting, &wait);
1066 ppb = dev->base = dev->dev->port->base;
1067 ppb_hi = dev->dev->port->base_hi;
1068 w_ctr(ppb, 0x0c);
1069 modes = dev->dev->port->modes;
1070
1071 /* Mode detection works up the chain of speed
1072 * This avoids a nasty if-then-else-if-... tree
1073 */
1074 dev->mode = PPA_NIBBLE;
1075
1076 if (modes & PARPORT_MODE_TRISTATE)
1077 dev->mode = PPA_PS2;
1078
1079 if (modes & PARPORT_MODE_ECP) {
1080 w_ecr(ppb_hi, 0x20);
1081 dev->mode = PPA_PS2;
1082 }
1083 if ((modes & PARPORT_MODE_EPP) && (modes & PARPORT_MODE_ECP))
1084 w_ecr(ppb_hi, 0x80);
1085
1086 /* Done configuration */
1087
1088 err = ppa_init(dev);
1089 ppa_pb_release(dev);
1090
1091 if (err)
1092 goto out1;
1093
1094 /* now the glue ... */
1095 if (dev->mode == PPA_NIBBLE || dev->mode == PPA_PS2)
1096 ports = 3;
1097 else
1098 ports = 8;
1099
1100 INIT_DELAYED_WORK(&dev->ppa_tq, ppa_interrupt);
1101
1102 err = -ENOMEM;
1103 host = scsi_host_alloc(&ppa_template, sizeof(ppa_struct *));
1104 if (!host)
1105 goto out1;
1106 host->io_port = pb->base;
1107 host->n_io_port = ports;
1108 host->dma_channel = -1;
1109 host->unique_id = pb->number;
1110 *(ppa_struct **)&host->hostdata = dev;
1111 dev->host = host;
1112 list_add_tail(&dev->list, &ppa_hosts);
1113 err = scsi_add_host(host, NULL);
1114 if (err)
1115 goto out2;
1116 scsi_scan_host(host);
1117 return 0;
1118out2:
1119 list_del_init(&dev->list);
1120 scsi_host_put(host);
1121out1:
1122 parport_unregister_device(dev->dev);
1123out:
1124 kfree(dev);
1125 return err;
1126}
1127
1128static void ppa_attach(struct parport *pb)
1129{
1130 __ppa_attach(pb);
1131}
1132
1133static void ppa_detach(struct parport *pb)
1134{
1135 ppa_struct *dev;
1136 list_for_each_entry(dev, &ppa_hosts, list) {
1137 if (dev->dev->port == pb) {
1138 list_del_init(&dev->list);
1139 scsi_remove_host(dev->host);
1140 scsi_host_put(dev->host);
1141 parport_unregister_device(dev->dev);
1142 kfree(dev);
1143 break;
1144 }
1145 }
1146}
1147
1148static struct parport_driver ppa_driver = {
1149 .name = "ppa",
1150 .match_port = ppa_attach,
1151 .detach = ppa_detach,
1152 .devmodel = true,
1153};
1154
1155static int __init ppa_driver_init(void)
1156{
1157 printk(KERN_INFO "ppa: Version %s\n", PPA_VERSION);
1158 return parport_register_driver(&ppa_driver);
1159}
1160
1161static void __exit ppa_driver_exit(void)
1162{
1163 parport_unregister_driver(&ppa_driver);
1164}
1165
1166module_init(ppa_driver_init);
1167module_exit(ppa_driver_exit);
1168MODULE_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 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_write_info(struct Scsi_Host *host, char *buffer, int length)
122{
123 ppa_struct *dev = ppa_dev(host);
124 unsigned long x;
125
126 if ((length > 5) && (strncmp(buffer, "mode=", 5) == 0)) {
127 x = simple_strtoul(buffer + 5, NULL, 0);
128 dev->mode = x;
129 return length;
130 }
131 if ((length > 10) && (strncmp(buffer, "recon_tmo=", 10) == 0)) {
132 x = simple_strtoul(buffer + 10, NULL, 0);
133 dev->recon_tmo = x;
134 printk(KERN_INFO "ppa: recon_tmo set to %ld\n", x);
135 return length;
136 }
137 printk(KERN_WARNING "ppa /proc: invalid variable\n");
138 return -EINVAL;
139}
140
141static int ppa_show_info(struct seq_file *m, struct Scsi_Host *host)
142{
143 ppa_struct *dev = ppa_dev(host);
144
145 seq_printf(m, "Version : %s\n", PPA_VERSION);
146 seq_printf(m, "Parport : %s\n", dev->dev->port->name);
147 seq_printf(m, "Mode : %s\n", PPA_MODE_STRING[dev->mode]);
148#if PPA_DEBUG > 0
149 seq_printf(m, "recon_tmo : %lu\n", dev->recon_tmo);
150#endif
151 return 0;
152}
153
154static int device_check(ppa_struct *dev);
155
156#if PPA_DEBUG > 0
157#define ppa_fail(x,y) printk("ppa: ppa_fail(%i) from %s at line %d\n",\
158 y, __func__, __LINE__); ppa_fail_func(x,y);
159static inline void ppa_fail_func(ppa_struct *dev, int error_code)
160#else
161static inline void ppa_fail(ppa_struct *dev, int error_code)
162#endif
163{
164 /* If we fail a device then we trash status / message bytes */
165 if (dev->cur_cmd) {
166 dev->cur_cmd->result = error_code << 16;
167 dev->failed = 1;
168 }
169}
170
171/*
172 * Wait for the high bit to be set.
173 *
174 * In principle, this could be tied to an interrupt, but the adapter
175 * doesn't appear to be designed to support interrupts. We spin on
176 * the 0x80 ready bit.
177 */
178static unsigned char ppa_wait(ppa_struct *dev)
179{
180 int k;
181 unsigned short ppb = dev->base;
182 unsigned char r;
183
184 k = PPA_SPIN_TMO;
185 /* Wait for bit 6 and 7 - PJC */
186 for (r = r_str(ppb); ((r & 0xc0) != 0xc0) && (k); k--) {
187 udelay(1);
188 r = r_str(ppb);
189 }
190
191 /*
192 * return some status information.
193 * Semantics: 0xc0 = ZIP wants more data
194 * 0xd0 = ZIP wants to send more data
195 * 0xe0 = ZIP is expecting SCSI command data
196 * 0xf0 = end of transfer, ZIP is sending status
197 */
198 if (k)
199 return (r & 0xf0);
200
201 /* Counter expired - Time out occurred */
202 ppa_fail(dev, DID_TIME_OUT);
203 printk(KERN_WARNING "ppa timeout in ppa_wait\n");
204 return 0; /* command timed out */
205}
206
207/*
208 * Clear EPP Timeout Bit
209 */
210static inline void epp_reset(unsigned short ppb)
211{
212 int i;
213
214 i = r_str(ppb);
215 w_str(ppb, i);
216 w_str(ppb, i & 0xfe);
217}
218
219/*
220 * Wait for empty ECP fifo (if we are in ECP fifo mode only)
221 */
222static inline void ecp_sync(ppa_struct *dev)
223{
224 int i, ppb_hi = dev->dev->port->base_hi;
225
226 if (ppb_hi == 0)
227 return;
228
229 if ((r_ecr(ppb_hi) & 0xe0) == 0x60) { /* mode 011 == ECP fifo mode */
230 for (i = 0; i < 100; i++) {
231 if (r_ecr(ppb_hi) & 0x01)
232 return;
233 udelay(5);
234 }
235 printk(KERN_WARNING "ppa: ECP sync failed as data still present in FIFO.\n");
236 }
237}
238
239static int ppa_byte_out(unsigned short base, const char *buffer, int len)
240{
241 int i;
242
243 for (i = len; i; i--) {
244 w_dtr(base, *buffer++);
245 w_ctr(base, 0xe);
246 w_ctr(base, 0xc);
247 }
248 return 1; /* All went well - we hope! */
249}
250
251static int ppa_byte_in(unsigned short base, char *buffer, int len)
252{
253 int i;
254
255 for (i = len; i; i--) {
256 *buffer++ = r_dtr(base);
257 w_ctr(base, 0x27);
258 w_ctr(base, 0x25);
259 }
260 return 1; /* All went well - we hope! */
261}
262
263static int ppa_nibble_in(unsigned short base, char *buffer, int len)
264{
265 for (; len; len--) {
266 unsigned char h;
267
268 w_ctr(base, 0x4);
269 h = r_str(base) & 0xf0;
270 w_ctr(base, 0x6);
271 *buffer++ = h | ((r_str(base) & 0xf0) >> 4);
272 }
273 return 1; /* All went well - we hope! */
274}
275
276static int ppa_out(ppa_struct *dev, char *buffer, int len)
277{
278 int r;
279 unsigned short ppb = dev->base;
280
281 r = ppa_wait(dev);
282
283 if ((r & 0x50) != 0x40) {
284 ppa_fail(dev, DID_ERROR);
285 return 0;
286 }
287 switch (dev->mode) {
288 case PPA_NIBBLE:
289 case PPA_PS2:
290 /* 8 bit output, with a loop */
291 r = ppa_byte_out(ppb, buffer, len);
292 break;
293
294 case PPA_EPP_32:
295 case PPA_EPP_16:
296 case PPA_EPP_8:
297 epp_reset(ppb);
298 w_ctr(ppb, 0x4);
299#ifdef CONFIG_SCSI_IZIP_EPP16
300 if (!(((long) buffer | len) & 0x01))
301 outsw(ppb + 4, buffer, len >> 1);
302#else
303 if (!(((long) buffer | len) & 0x03))
304 outsl(ppb + 4, buffer, len >> 2);
305#endif
306 else
307 outsb(ppb + 4, buffer, len);
308 w_ctr(ppb, 0xc);
309 r = !(r_str(ppb) & 0x01);
310 w_ctr(ppb, 0xc);
311 ecp_sync(dev);
312 break;
313
314 default:
315 printk(KERN_ERR "PPA: bug in ppa_out()\n");
316 r = 0;
317 }
318 return r;
319}
320
321static int ppa_in(ppa_struct *dev, char *buffer, int len)
322{
323 int r;
324 unsigned short ppb = dev->base;
325
326 r = ppa_wait(dev);
327
328 if ((r & 0x50) != 0x50) {
329 ppa_fail(dev, DID_ERROR);
330 return 0;
331 }
332 switch (dev->mode) {
333 case PPA_NIBBLE:
334 /* 4 bit input, with a loop */
335 r = ppa_nibble_in(ppb, buffer, len);
336 w_ctr(ppb, 0xc);
337 break;
338
339 case PPA_PS2:
340 /* 8 bit input, with a loop */
341 w_ctr(ppb, 0x25);
342 r = ppa_byte_in(ppb, buffer, len);
343 w_ctr(ppb, 0x4);
344 w_ctr(ppb, 0xc);
345 break;
346
347 case PPA_EPP_32:
348 case PPA_EPP_16:
349 case PPA_EPP_8:
350 epp_reset(ppb);
351 w_ctr(ppb, 0x24);
352#ifdef CONFIG_SCSI_IZIP_EPP16
353 if (!(((long) buffer | len) & 0x01))
354 insw(ppb + 4, buffer, len >> 1);
355#else
356 if (!(((long) buffer | len) & 0x03))
357 insl(ppb + 4, buffer, len >> 2);
358#endif
359 else
360 insb(ppb + 4, buffer, len);
361 w_ctr(ppb, 0x2c);
362 r = !(r_str(ppb) & 0x01);
363 w_ctr(ppb, 0x2c);
364 ecp_sync(dev);
365 break;
366
367 default:
368 printk(KERN_ERR "PPA: bug in ppa_ins()\n");
369 r = 0;
370 break;
371 }
372 return r;
373}
374
375/* end of ppa_io.h */
376static inline void ppa_d_pulse(unsigned short ppb, unsigned char b)
377{
378 w_dtr(ppb, b);
379 w_ctr(ppb, 0xc);
380 w_ctr(ppb, 0xe);
381 w_ctr(ppb, 0xc);
382 w_ctr(ppb, 0x4);
383 w_ctr(ppb, 0xc);
384}
385
386static void ppa_disconnect(ppa_struct *dev)
387{
388 unsigned short ppb = dev->base;
389
390 ppa_d_pulse(ppb, 0);
391 ppa_d_pulse(ppb, 0x3c);
392 ppa_d_pulse(ppb, 0x20);
393 ppa_d_pulse(ppb, 0xf);
394}
395
396static inline void ppa_c_pulse(unsigned short ppb, unsigned char b)
397{
398 w_dtr(ppb, b);
399 w_ctr(ppb, 0x4);
400 w_ctr(ppb, 0x6);
401 w_ctr(ppb, 0x4);
402 w_ctr(ppb, 0xc);
403}
404
405static inline void ppa_connect(ppa_struct *dev, int flag)
406{
407 unsigned short ppb = dev->base;
408
409 ppa_c_pulse(ppb, 0);
410 ppa_c_pulse(ppb, 0x3c);
411 ppa_c_pulse(ppb, 0x20);
412 if ((flag == CONNECT_EPP_MAYBE) && IN_EPP_MODE(dev->mode))
413 ppa_c_pulse(ppb, 0xcf);
414 else
415 ppa_c_pulse(ppb, 0x8f);
416}
417
418static int ppa_select(ppa_struct *dev, int target)
419{
420 int k;
421 unsigned short ppb = dev->base;
422
423 /*
424 * Bit 6 (0x40) is the device selected bit.
425 * First we must wait till the current device goes off line...
426 */
427 k = PPA_SELECT_TMO;
428 do {
429 k--;
430 udelay(1);
431 } while ((r_str(ppb) & 0x40) && (k));
432 if (!k)
433 return 0;
434
435 w_dtr(ppb, (1 << target));
436 w_ctr(ppb, 0xe);
437 w_ctr(ppb, 0xc);
438 w_dtr(ppb, 0x80); /* This is NOT the initator */
439 w_ctr(ppb, 0x8);
440
441 k = PPA_SELECT_TMO;
442 do {
443 k--;
444 udelay(1);
445 }
446 while (!(r_str(ppb) & 0x40) && (k));
447 if (!k)
448 return 0;
449
450 return 1;
451}
452
453/*
454 * This is based on a trace of what the Iomega DOS 'guest' driver does.
455 * I've tried several different kinds of parallel ports with guest and
456 * coded this to react in the same ways that it does.
457 *
458 * The return value from this function is just a hint about where the
459 * handshaking failed.
460 *
461 */
462static int ppa_init(ppa_struct *dev)
463{
464 int retv;
465 unsigned short ppb = dev->base;
466
467 ppa_disconnect(dev);
468 ppa_connect(dev, CONNECT_NORMAL);
469
470 retv = 2; /* Failed */
471
472 w_ctr(ppb, 0xe);
473 if ((r_str(ppb) & 0x08) == 0x08)
474 retv--;
475
476 w_ctr(ppb, 0xc);
477 if ((r_str(ppb) & 0x08) == 0x00)
478 retv--;
479
480 if (!retv)
481 ppa_reset_pulse(ppb);
482 udelay(1000); /* Allow devices to settle down */
483 ppa_disconnect(dev);
484 udelay(1000); /* Another delay to allow devices to settle */
485
486 if (retv)
487 return -EIO;
488
489 return device_check(dev);
490}
491
492static inline int ppa_send_command(struct scsi_cmnd *cmd)
493{
494 ppa_struct *dev = ppa_dev(cmd->device->host);
495 int k;
496
497 w_ctr(dev->base, 0x0c);
498
499 for (k = 0; k < cmd->cmd_len; k++)
500 if (!ppa_out(dev, &cmd->cmnd[k], 1))
501 return 0;
502 return 1;
503}
504
505/*
506 * The bulk flag enables some optimisations in the data transfer loops,
507 * it should be true for any command that transfers data in integral
508 * numbers of sectors.
509 *
510 * The driver appears to remain stable if we speed up the parallel port
511 * i/o in this function, but not elsewhere.
512 */
513static int ppa_completion(struct scsi_cmnd *cmd)
514{
515 /* Return codes:
516 * -1 Error
517 * 0 Told to schedule
518 * 1 Finished data transfer
519 */
520 ppa_struct *dev = ppa_dev(cmd->device->host);
521 unsigned short ppb = dev->base;
522 unsigned long start_jiffies = jiffies;
523
524 unsigned char r, v;
525 int fast, bulk, status;
526
527 v = cmd->cmnd[0];
528 bulk = ((v == READ_6) ||
529 (v == READ_10) || (v == WRITE_6) || (v == WRITE_10));
530
531 /*
532 * We only get here if the drive is ready to comunicate,
533 * hence no need for a full ppa_wait.
534 */
535 r = (r_str(ppb) & 0xf0);
536
537 while (r != (unsigned char) 0xf0) {
538 /*
539 * If we have been running for more than a full timer tick
540 * then take a rest.
541 */
542 if (time_after(jiffies, start_jiffies + 1))
543 return 0;
544
545 if ((cmd->SCp.this_residual <= 0)) {
546 ppa_fail(dev, DID_ERROR);
547 return -1; /* ERROR_RETURN */
548 }
549
550 /* On some hardware we have SCSI disconnected (6th bit low)
551 * for about 100usecs. It is too expensive to wait a
552 * tick on every loop so we busy wait for no more than
553 * 500usecs to give the drive a chance first. We do not
554 * change things for "normal" hardware since generally
555 * the 6th bit is always high.
556 * This makes the CPU load higher on some hardware
557 * but otherwise we can not get more than 50K/secs
558 * on this problem hardware.
559 */
560 if ((r & 0xc0) != 0xc0) {
561 /* Wait for reconnection should be no more than
562 * jiffy/2 = 5ms = 5000 loops
563 */
564 unsigned long k = dev->recon_tmo;
565 for (; k && ((r = (r_str(ppb) & 0xf0)) & 0xc0) != 0xc0;
566 k--)
567 udelay(1);
568
569 if (!k)
570 return 0;
571 }
572
573 /* determine if we should use burst I/O */
574 fast = (bulk && (cmd->SCp.this_residual >= PPA_BURST_SIZE))
575 ? PPA_BURST_SIZE : 1;
576
577 if (r == (unsigned char) 0xc0)
578 status = ppa_out(dev, cmd->SCp.ptr, fast);
579 else
580 status = ppa_in(dev, cmd->SCp.ptr, fast);
581
582 cmd->SCp.ptr += fast;
583 cmd->SCp.this_residual -= fast;
584
585 if (!status) {
586 ppa_fail(dev, DID_BUS_BUSY);
587 return -1; /* ERROR_RETURN */
588 }
589 if (cmd->SCp.buffer && !cmd->SCp.this_residual) {
590 /* if scatter/gather, advance to the next segment */
591 if (cmd->SCp.buffers_residual--) {
592 cmd->SCp.buffer++;
593 cmd->SCp.this_residual =
594 cmd->SCp.buffer->length;
595 cmd->SCp.ptr = sg_virt(cmd->SCp.buffer);
596 }
597 }
598 /* Now check to see if the drive is ready to comunicate */
599 r = (r_str(ppb) & 0xf0);
600 /* If not, drop back down to the scheduler and wait a timer tick */
601 if (!(r & 0x80))
602 return 0;
603 }
604 return 1; /* FINISH_RETURN */
605}
606
607/*
608 * Since the PPA itself doesn't generate interrupts, we use
609 * the scheduler's task queue to generate a stream of call-backs and
610 * complete the request when the drive is ready.
611 */
612static void ppa_interrupt(struct work_struct *work)
613{
614 ppa_struct *dev = container_of(work, ppa_struct, ppa_tq.work);
615 struct scsi_cmnd *cmd = dev->cur_cmd;
616
617 if (!cmd) {
618 printk(KERN_ERR "PPA: bug in ppa_interrupt\n");
619 return;
620 }
621 if (ppa_engine(dev, cmd)) {
622 schedule_delayed_work(&dev->ppa_tq, 1);
623 return;
624 }
625 /* Command must of completed hence it is safe to let go... */
626#if PPA_DEBUG > 0
627 switch ((cmd->result >> 16) & 0xff) {
628 case DID_OK:
629 break;
630 case DID_NO_CONNECT:
631 printk(KERN_DEBUG "ppa: no device at SCSI ID %i\n", cmd->device->target);
632 break;
633 case DID_BUS_BUSY:
634 printk(KERN_DEBUG "ppa: BUS BUSY - EPP timeout detected\n");
635 break;
636 case DID_TIME_OUT:
637 printk(KERN_DEBUG "ppa: unknown timeout\n");
638 break;
639 case DID_ABORT:
640 printk(KERN_DEBUG "ppa: told to abort\n");
641 break;
642 case DID_PARITY:
643 printk(KERN_DEBUG "ppa: parity error (???)\n");
644 break;
645 case DID_ERROR:
646 printk(KERN_DEBUG "ppa: internal driver error\n");
647 break;
648 case DID_RESET:
649 printk(KERN_DEBUG "ppa: told to reset device\n");
650 break;
651 case DID_BAD_INTR:
652 printk(KERN_WARNING "ppa: bad interrupt (???)\n");
653 break;
654 default:
655 printk(KERN_WARNING "ppa: bad return code (%02x)\n",
656 (cmd->result >> 16) & 0xff);
657 }
658#endif
659
660 if (cmd->SCp.phase > 1)
661 ppa_disconnect(dev);
662
663 ppa_pb_dismiss(dev);
664
665 dev->cur_cmd = NULL;
666
667 cmd->scsi_done(cmd);
668}
669
670static int ppa_engine(ppa_struct *dev, struct scsi_cmnd *cmd)
671{
672 unsigned short ppb = dev->base;
673 unsigned char l = 0, h = 0;
674 int retv;
675
676 /* First check for any errors that may of occurred
677 * Here we check for internal errors
678 */
679 if (dev->failed)
680 return 0;
681
682 switch (cmd->SCp.phase) {
683 case 0: /* Phase 0 - Waiting for parport */
684 if (time_after(jiffies, dev->jstart + HZ)) {
685 /*
686 * We waited more than a second
687 * for parport to call us
688 */
689 ppa_fail(dev, DID_BUS_BUSY);
690 return 0;
691 }
692 return 1; /* wait until ppa_wakeup claims parport */
693 case 1: /* Phase 1 - Connected */
694 { /* Perform a sanity check for cable unplugged */
695 int retv = 2; /* Failed */
696
697 ppa_connect(dev, CONNECT_EPP_MAYBE);
698
699 w_ctr(ppb, 0xe);
700 if ((r_str(ppb) & 0x08) == 0x08)
701 retv--;
702
703 w_ctr(ppb, 0xc);
704 if ((r_str(ppb) & 0x08) == 0x00)
705 retv--;
706
707 if (retv) {
708 if (time_after(jiffies, dev->jstart + (1 * HZ))) {
709 printk(KERN_ERR "ppa: Parallel port cable is unplugged.\n");
710 ppa_fail(dev, DID_BUS_BUSY);
711 return 0;
712 } else {
713 ppa_disconnect(dev);
714 return 1; /* Try again in a jiffy */
715 }
716 }
717 cmd->SCp.phase++;
718 }
719
720 case 2: /* Phase 2 - We are now talking to the scsi bus */
721 if (!ppa_select(dev, scmd_id(cmd))) {
722 ppa_fail(dev, DID_NO_CONNECT);
723 return 0;
724 }
725 cmd->SCp.phase++;
726
727 case 3: /* Phase 3 - Ready to accept a command */
728 w_ctr(ppb, 0x0c);
729 if (!(r_str(ppb) & 0x80))
730 return 1;
731
732 if (!ppa_send_command(cmd))
733 return 0;
734 cmd->SCp.phase++;
735
736 case 4: /* Phase 4 - Setup scatter/gather buffers */
737 if (scsi_bufflen(cmd)) {
738 cmd->SCp.buffer = scsi_sglist(cmd);
739 cmd->SCp.this_residual = cmd->SCp.buffer->length;
740 cmd->SCp.ptr = sg_virt(cmd->SCp.buffer);
741 } else {
742 cmd->SCp.buffer = NULL;
743 cmd->SCp.this_residual = 0;
744 cmd->SCp.ptr = NULL;
745 }
746 cmd->SCp.buffers_residual = scsi_sg_count(cmd) - 1;
747 cmd->SCp.phase++;
748
749 case 5: /* Phase 5 - Data transfer stage */
750 w_ctr(ppb, 0x0c);
751 if (!(r_str(ppb) & 0x80))
752 return 1;
753
754 retv = ppa_completion(cmd);
755 if (retv == -1)
756 return 0;
757 if (retv == 0)
758 return 1;
759 cmd->SCp.phase++;
760
761 case 6: /* Phase 6 - Read status/message */
762 cmd->result = DID_OK << 16;
763 /* Check for data overrun */
764 if (ppa_wait(dev) != (unsigned char) 0xf0) {
765 ppa_fail(dev, DID_ERROR);
766 return 0;
767 }
768 if (ppa_in(dev, &l, 1)) { /* read status byte */
769 /* Check for optional message byte */
770 if (ppa_wait(dev) == (unsigned char) 0xf0)
771 ppa_in(dev, &h, 1);
772 cmd->result =
773 (DID_OK << 16) + (h << 8) + (l & STATUS_MASK);
774 }
775 return 0; /* Finished */
776 break;
777
778 default:
779 printk(KERN_ERR "ppa: Invalid scsi phase\n");
780 }
781 return 0;
782}
783
784static int ppa_queuecommand_lck(struct scsi_cmnd *cmd,
785 void (*done) (struct scsi_cmnd *))
786{
787 ppa_struct *dev = ppa_dev(cmd->device->host);
788
789 if (dev->cur_cmd) {
790 printk(KERN_ERR "PPA: bug in ppa_queuecommand\n");
791 return 0;
792 }
793 dev->failed = 0;
794 dev->jstart = jiffies;
795 dev->cur_cmd = cmd;
796 cmd->scsi_done = done;
797 cmd->result = DID_ERROR << 16; /* default return code */
798 cmd->SCp.phase = 0; /* bus free */
799
800 schedule_delayed_work(&dev->ppa_tq, 0);
801
802 ppa_pb_claim(dev);
803
804 return 0;
805}
806
807static DEF_SCSI_QCMD(ppa_queuecommand)
808
809/*
810 * Apparently the disk->capacity attribute is off by 1 sector
811 * for all disk drives. We add the one here, but it should really
812 * be done in sd.c. Even if it gets fixed there, this will still
813 * work.
814 */
815static int ppa_biosparam(struct scsi_device *sdev, struct block_device *dev,
816 sector_t capacity, int ip[])
817{
818 ip[0] = 0x40;
819 ip[1] = 0x20;
820 ip[2] = ((unsigned long) capacity + 1) / (ip[0] * ip[1]);
821 if (ip[2] > 1024) {
822 ip[0] = 0xff;
823 ip[1] = 0x3f;
824 ip[2] = ((unsigned long) capacity + 1) / (ip[0] * ip[1]);
825 if (ip[2] > 1023)
826 ip[2] = 1023;
827 }
828 return 0;
829}
830
831static int ppa_abort(struct scsi_cmnd *cmd)
832{
833 ppa_struct *dev = ppa_dev(cmd->device->host);
834 /*
835 * There is no method for aborting commands since Iomega
836 * have tied the SCSI_MESSAGE line high in the interface
837 */
838
839 switch (cmd->SCp.phase) {
840 case 0: /* Do not have access to parport */
841 case 1: /* Have not connected to interface */
842 dev->cur_cmd = NULL; /* Forget the problem */
843 return SUCCESS;
844 break;
845 default: /* SCSI command sent, can not abort */
846 return FAILED;
847 break;
848 }
849}
850
851static void ppa_reset_pulse(unsigned int base)
852{
853 w_dtr(base, 0x40);
854 w_ctr(base, 0x8);
855 udelay(30);
856 w_ctr(base, 0xc);
857}
858
859static int ppa_reset(struct scsi_cmnd *cmd)
860{
861 ppa_struct *dev = ppa_dev(cmd->device->host);
862
863 if (cmd->SCp.phase)
864 ppa_disconnect(dev);
865 dev->cur_cmd = NULL; /* Forget the problem */
866
867 ppa_connect(dev, CONNECT_NORMAL);
868 ppa_reset_pulse(dev->base);
869 mdelay(1); /* device settle delay */
870 ppa_disconnect(dev);
871 mdelay(1); /* device settle delay */
872 return SUCCESS;
873}
874
875static int device_check(ppa_struct *dev)
876{
877 /* This routine looks for a device and then attempts to use EPP
878 to send a command. If all goes as planned then EPP is available. */
879
880 static u8 cmd[6] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
881 int loop, old_mode, status, k, ppb = dev->base;
882 unsigned char l;
883
884 old_mode = dev->mode;
885 for (loop = 0; loop < 8; loop++) {
886 /* Attempt to use EPP for Test Unit Ready */
887 if ((ppb & 0x0007) == 0x0000)
888 dev->mode = PPA_EPP_32;
889
890second_pass:
891 ppa_connect(dev, CONNECT_EPP_MAYBE);
892 /* Select SCSI device */
893 if (!ppa_select(dev, loop)) {
894 ppa_disconnect(dev);
895 continue;
896 }
897 printk(KERN_INFO "ppa: Found device at ID %i, Attempting to use %s\n",
898 loop, PPA_MODE_STRING[dev->mode]);
899
900 /* Send SCSI command */
901 status = 1;
902 w_ctr(ppb, 0x0c);
903 for (l = 0; (l < 6) && (status); l++)
904 status = ppa_out(dev, cmd, 1);
905
906 if (!status) {
907 ppa_disconnect(dev);
908 ppa_connect(dev, CONNECT_EPP_MAYBE);
909 w_dtr(ppb, 0x40);
910 w_ctr(ppb, 0x08);
911 udelay(30);
912 w_ctr(ppb, 0x0c);
913 udelay(1000);
914 ppa_disconnect(dev);
915 udelay(1000);
916 if (dev->mode == PPA_EPP_32) {
917 dev->mode = old_mode;
918 goto second_pass;
919 }
920 return -EIO;
921 }
922 w_ctr(ppb, 0x0c);
923 k = 1000000; /* 1 Second */
924 do {
925 l = r_str(ppb);
926 k--;
927 udelay(1);
928 } while (!(l & 0x80) && (k));
929
930 l &= 0xf0;
931
932 if (l != 0xf0) {
933 ppa_disconnect(dev);
934 ppa_connect(dev, CONNECT_EPP_MAYBE);
935 ppa_reset_pulse(ppb);
936 udelay(1000);
937 ppa_disconnect(dev);
938 udelay(1000);
939 if (dev->mode == PPA_EPP_32) {
940 dev->mode = old_mode;
941 goto second_pass;
942 }
943 return -EIO;
944 }
945 ppa_disconnect(dev);
946 printk(KERN_INFO "ppa: Communication established with ID %i using %s\n",
947 loop, PPA_MODE_STRING[dev->mode]);
948 ppa_connect(dev, CONNECT_EPP_MAYBE);
949 ppa_reset_pulse(ppb);
950 udelay(1000);
951 ppa_disconnect(dev);
952 udelay(1000);
953 return 0;
954 }
955 return -ENODEV;
956}
957
958static int ppa_adjust_queue(struct scsi_device *device)
959{
960 blk_queue_bounce_limit(device->request_queue, BLK_BOUNCE_HIGH);
961 return 0;
962}
963
964static struct scsi_host_template ppa_template = {
965 .module = THIS_MODULE,
966 .proc_name = "ppa",
967 .show_info = ppa_show_info,
968 .write_info = ppa_write_info,
969 .name = "Iomega VPI0 (ppa) interface",
970 .queuecommand = ppa_queuecommand,
971 .eh_abort_handler = ppa_abort,
972 .eh_bus_reset_handler = ppa_reset,
973 .eh_host_reset_handler = ppa_reset,
974 .bios_param = ppa_biosparam,
975 .this_id = -1,
976 .sg_tablesize = SG_ALL,
977 .cmd_per_lun = 1,
978 .use_clustering = ENABLE_CLUSTERING,
979 .can_queue = 1,
980 .slave_alloc = ppa_adjust_queue,
981};
982
983/***************************************************************************
984 * Parallel port probing routines *
985 ***************************************************************************/
986
987static LIST_HEAD(ppa_hosts);
988
989static int __ppa_attach(struct parport *pb)
990{
991 struct Scsi_Host *host;
992 DECLARE_WAIT_QUEUE_HEAD_ONSTACK(waiting);
993 DEFINE_WAIT(wait);
994 ppa_struct *dev;
995 int ports;
996 int modes, ppb, ppb_hi;
997 int err = -ENOMEM;
998
999 dev = kzalloc(sizeof(ppa_struct), GFP_KERNEL);
1000 if (!dev)
1001 return -ENOMEM;
1002 dev->base = -1;
1003 dev->mode = PPA_AUTODETECT;
1004 dev->recon_tmo = PPA_RECON_TMO;
1005 init_waitqueue_head(&waiting);
1006 dev->dev = parport_register_device(pb, "ppa", NULL, ppa_wakeup,
1007 NULL, 0, dev);
1008
1009 if (!dev->dev)
1010 goto out;
1011
1012 /* Claim the bus so it remembers what we do to the control
1013 * registers. [ CTR and ECP ]
1014 */
1015 err = -EBUSY;
1016 dev->waiting = &waiting;
1017 prepare_to_wait(&waiting, &wait, TASK_UNINTERRUPTIBLE);
1018 if (ppa_pb_claim(dev))
1019 schedule_timeout(3 * HZ);
1020 if (dev->wanted) {
1021 printk(KERN_ERR "ppa%d: failed to claim parport because "
1022 "a pardevice is owning the port for too long "
1023 "time!\n", pb->number);
1024 ppa_pb_dismiss(dev);
1025 dev->waiting = NULL;
1026 finish_wait(&waiting, &wait);
1027 goto out1;
1028 }
1029 dev->waiting = NULL;
1030 finish_wait(&waiting, &wait);
1031 ppb = dev->base = dev->dev->port->base;
1032 ppb_hi = dev->dev->port->base_hi;
1033 w_ctr(ppb, 0x0c);
1034 modes = dev->dev->port->modes;
1035
1036 /* Mode detection works up the chain of speed
1037 * This avoids a nasty if-then-else-if-... tree
1038 */
1039 dev->mode = PPA_NIBBLE;
1040
1041 if (modes & PARPORT_MODE_TRISTATE)
1042 dev->mode = PPA_PS2;
1043
1044 if (modes & PARPORT_MODE_ECP) {
1045 w_ecr(ppb_hi, 0x20);
1046 dev->mode = PPA_PS2;
1047 }
1048 if ((modes & PARPORT_MODE_EPP) && (modes & PARPORT_MODE_ECP))
1049 w_ecr(ppb_hi, 0x80);
1050
1051 /* Done configuration */
1052
1053 err = ppa_init(dev);
1054 ppa_pb_release(dev);
1055
1056 if (err)
1057 goto out1;
1058
1059 /* now the glue ... */
1060 if (dev->mode == PPA_NIBBLE || dev->mode == PPA_PS2)
1061 ports = 3;
1062 else
1063 ports = 8;
1064
1065 INIT_DELAYED_WORK(&dev->ppa_tq, ppa_interrupt);
1066
1067 err = -ENOMEM;
1068 host = scsi_host_alloc(&ppa_template, sizeof(ppa_struct *));
1069 if (!host)
1070 goto out1;
1071 host->io_port = pb->base;
1072 host->n_io_port = ports;
1073 host->dma_channel = -1;
1074 host->unique_id = pb->number;
1075 *(ppa_struct **)&host->hostdata = dev;
1076 dev->host = host;
1077 list_add_tail(&dev->list, &ppa_hosts);
1078 err = scsi_add_host(host, NULL);
1079 if (err)
1080 goto out2;
1081 scsi_scan_host(host);
1082 return 0;
1083out2:
1084 list_del_init(&dev->list);
1085 scsi_host_put(host);
1086out1:
1087 parport_unregister_device(dev->dev);
1088out:
1089 kfree(dev);
1090 return err;
1091}
1092
1093static void ppa_attach(struct parport *pb)
1094{
1095 __ppa_attach(pb);
1096}
1097
1098static void ppa_detach(struct parport *pb)
1099{
1100 ppa_struct *dev;
1101 list_for_each_entry(dev, &ppa_hosts, list) {
1102 if (dev->dev->port == pb) {
1103 list_del_init(&dev->list);
1104 scsi_remove_host(dev->host);
1105 scsi_host_put(dev->host);
1106 parport_unregister_device(dev->dev);
1107 kfree(dev);
1108 break;
1109 }
1110 }
1111}
1112
1113static struct parport_driver ppa_driver = {
1114 .name = "ppa",
1115 .attach = ppa_attach,
1116 .detach = ppa_detach,
1117};
1118
1119static int __init ppa_driver_init(void)
1120{
1121 printk(KERN_INFO "ppa: Version %s\n", PPA_VERSION);
1122 return parport_register_driver(&ppa_driver);
1123}
1124
1125static void __exit ppa_driver_exit(void)
1126{
1127 parport_unregister_driver(&ppa_driver);
1128}
1129
1130module_init(ppa_driver_init);
1131module_exit(ppa_driver_exit);
1132MODULE_LICENSE("GPL");