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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/* 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 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07009 */
10
Linus Torvalds1da177e2005-04-16 15:20:36 -070011#include <linux/init.h>
12#include <linux/kernel.h>
13#include <linux/module.h>
14#include <linux/blkdev.h>
15#include <linux/parport.h>
16#include <linux/workqueue.h>
Jeff Garzik 68b3aa72005-05-28 07:56:31 -040017#include <linux/delay.h>
Marcelo Feitoza Parisi60c904a2006-03-28 01:56:47 -080018#include <linux/jiffies.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070019#include <asm/io.h>
20
21#include <scsi/scsi.h>
22#include <scsi/scsi_cmnd.h>
23#include <scsi/scsi_device.h>
24#include <scsi/scsi_host.h>
25
26
27static void ppa_reset_pulse(unsigned int base);
28
29typedef struct {
30 struct pardevice *dev; /* Parport device entry */
31 int base; /* Actual port address */
32 int mode; /* Transfer mode */
33 struct scsi_cmnd *cur_cmd; /* Current queued command */
David Howellsc4028952006-11-22 14:57:56 +000034 struct delayed_work ppa_tq; /* Polling interrupt stuff */
Linus Torvalds1da177e2005-04-16 15:20:36 -070035 unsigned long jstart; /* Jiffies at start */
36 unsigned long recon_tmo; /* How many usecs to wait for reconnection (6th bit) */
37 unsigned int failed:1; /* Failure flag */
38 unsigned wanted:1; /* Parport sharing busy flag */
39 wait_queue_head_t *waiting;
40 struct Scsi_Host *host;
41 struct list_head list;
42} ppa_struct;
43
44#include "ppa.h"
45
46static inline ppa_struct *ppa_dev(struct Scsi_Host *host)
47{
48 return *(ppa_struct **)&host->hostdata;
49}
50
51static DEFINE_SPINLOCK(arbitration_lock);
52
53static void got_it(ppa_struct *dev)
54{
55 dev->base = dev->dev->port->base;
56 if (dev->cur_cmd)
57 dev->cur_cmd->SCp.phase = 1;
58 else
59 wake_up(dev->waiting);
60}
61
62static void ppa_wakeup(void *ref)
63{
64 ppa_struct *dev = (ppa_struct *) ref;
65 unsigned long flags;
66
67 spin_lock_irqsave(&arbitration_lock, flags);
68 if (dev->wanted) {
69 parport_claim(dev->dev);
70 got_it(dev);
71 dev->wanted = 0;
72 }
73 spin_unlock_irqrestore(&arbitration_lock, flags);
74 return;
75}
76
77static int ppa_pb_claim(ppa_struct *dev)
78{
79 unsigned long flags;
80 int res = 1;
81 spin_lock_irqsave(&arbitration_lock, flags);
82 if (parport_claim(dev->dev) == 0) {
83 got_it(dev);
84 res = 0;
85 }
86 dev->wanted = res;
87 spin_unlock_irqrestore(&arbitration_lock, flags);
88 return res;
89}
90
91static void ppa_pb_dismiss(ppa_struct *dev)
92{
93 unsigned long flags;
94 int wanted;
95 spin_lock_irqsave(&arbitration_lock, flags);
96 wanted = dev->wanted;
97 dev->wanted = 0;
98 spin_unlock_irqrestore(&arbitration_lock, flags);
99 if (!wanted)
100 parport_release(dev->dev);
101}
102
103static inline void ppa_pb_release(ppa_struct *dev)
104{
105 parport_release(dev->dev);
106}
107
108/*
109 * Start of Chipset kludges
110 */
111
112/* This is to give the ppa driver a way to modify the timings (and other
113 * parameters) by writing to the /proc/scsi/ppa/0 file.
114 * Very simple method really... (To simple, no error checking :( )
115 * Reason: Kernel hackers HATE having to unload and reload modules for
116 * testing...
117 * Also gives a method to use a script to obtain optimum timings (TODO)
118 */
119
120static inline int ppa_proc_write(ppa_struct *dev, char *buffer, int length)
121{
122 unsigned long x;
123
124 if ((length > 5) && (strncmp(buffer, "mode=", 5) == 0)) {
125 x = simple_strtoul(buffer + 5, NULL, 0);
126 dev->mode = x;
127 return length;
128 }
129 if ((length > 10) && (strncmp(buffer, "recon_tmo=", 10) == 0)) {
130 x = simple_strtoul(buffer + 10, NULL, 0);
131 dev->recon_tmo = x;
132 printk("ppa: recon_tmo set to %ld\n", x);
133 return length;
134 }
135 printk("ppa /proc: invalid variable\n");
136 return (-EINVAL);
137}
138
139static int ppa_proc_info(struct Scsi_Host *host, char *buffer, char **start, off_t offset, int length, int inout)
140{
141 int len = 0;
142 ppa_struct *dev = ppa_dev(host);
143
144 if (inout)
145 return ppa_proc_write(dev, buffer, length);
146
147 len += sprintf(buffer + len, "Version : %s\n", PPA_VERSION);
148 len +=
149 sprintf(buffer + len, "Parport : %s\n",
150 dev->dev->port->name);
151 len +=
152 sprintf(buffer + len, "Mode : %s\n",
153 PPA_MODE_STRING[dev->mode]);
154#if PPA_DEBUG > 0
155 len +=
156 sprintf(buffer + len, "recon_tmo : %lu\n", dev->recon_tmo);
157#endif
158
159 /* Request for beyond end of buffer */
160 if (offset > length)
161 return 0;
162
163 *start = buffer + offset;
164 len -= offset;
165 if (len > length)
166 len = length;
167 return len;
168}
169
170static int device_check(ppa_struct *dev);
171
172#if PPA_DEBUG > 0
173#define ppa_fail(x,y) printk("ppa: ppa_fail(%i) from %s at line %d\n",\
174 y, __FUNCTION__, __LINE__); ppa_fail_func(x,y);
175static inline void ppa_fail_func(ppa_struct *dev, int error_code)
176#else
177static inline void ppa_fail(ppa_struct *dev, int error_code)
178#endif
179{
180 /* If we fail a device then we trash status / message bytes */
181 if (dev->cur_cmd) {
182 dev->cur_cmd->result = error_code << 16;
183 dev->failed = 1;
184 }
185}
186
187/*
188 * Wait for the high bit to be set.
189 *
190 * In principle, this could be tied to an interrupt, but the adapter
191 * doesn't appear to be designed to support interrupts. We spin on
192 * the 0x80 ready bit.
193 */
194static unsigned char ppa_wait(ppa_struct *dev)
195{
196 int k;
197 unsigned short ppb = dev->base;
198 unsigned char r;
199
200 k = PPA_SPIN_TMO;
201 /* Wait for bit 6 and 7 - PJC */
202 for (r = r_str(ppb); ((r & 0xc0) != 0xc0) && (k); k--) {
203 udelay(1);
204 r = r_str(ppb);
205 }
206
207 /*
208 * return some status information.
209 * Semantics: 0xc0 = ZIP wants more data
210 * 0xd0 = ZIP wants to send more data
211 * 0xe0 = ZIP is expecting SCSI command data
212 * 0xf0 = end of transfer, ZIP is sending status
213 */
214 if (k)
215 return (r & 0xf0);
216
217 /* Counter expired - Time out occurred */
218 ppa_fail(dev, DID_TIME_OUT);
219 printk("ppa timeout in ppa_wait\n");
220 return 0; /* command timed out */
221}
222
223/*
224 * Clear EPP Timeout Bit
225 */
226static inline void epp_reset(unsigned short ppb)
227{
228 int i;
229
230 i = r_str(ppb);
231 w_str(ppb, i);
232 w_str(ppb, i & 0xfe);
233}
234
235/*
236 * Wait for empty ECP fifo (if we are in ECP fifo mode only)
237 */
238static inline void ecp_sync(ppa_struct *dev)
239{
240 int i, ppb_hi = dev->dev->port->base_hi;
241
242 if (ppb_hi == 0)
243 return;
244
245 if ((r_ecr(ppb_hi) & 0xe0) == 0x60) { /* mode 011 == ECP fifo mode */
246 for (i = 0; i < 100; i++) {
247 if (r_ecr(ppb_hi) & 0x01)
248 return;
249 udelay(5);
250 }
251 printk("ppa: ECP sync failed as data still present in FIFO.\n");
252 }
253}
254
255static int ppa_byte_out(unsigned short base, const char *buffer, int len)
256{
257 int i;
258
259 for (i = len; i; i--) {
260 w_dtr(base, *buffer++);
261 w_ctr(base, 0xe);
262 w_ctr(base, 0xc);
263 }
264 return 1; /* All went well - we hope! */
265}
266
267static int ppa_byte_in(unsigned short base, char *buffer, int len)
268{
269 int i;
270
271 for (i = len; i; i--) {
272 *buffer++ = r_dtr(base);
273 w_ctr(base, 0x27);
274 w_ctr(base, 0x25);
275 }
276 return 1; /* All went well - we hope! */
277}
278
279static int ppa_nibble_in(unsigned short base, char *buffer, int len)
280{
281 for (; len; len--) {
282 unsigned char h;
283
284 w_ctr(base, 0x4);
285 h = r_str(base) & 0xf0;
286 w_ctr(base, 0x6);
287 *buffer++ = h | ((r_str(base) & 0xf0) >> 4);
288 }
289 return 1; /* All went well - we hope! */
290}
291
292static int ppa_out(ppa_struct *dev, char *buffer, int len)
293{
294 int r;
295 unsigned short ppb = dev->base;
296
297 r = ppa_wait(dev);
298
299 if ((r & 0x50) != 0x40) {
300 ppa_fail(dev, DID_ERROR);
301 return 0;
302 }
303 switch (dev->mode) {
304 case PPA_NIBBLE:
305 case PPA_PS2:
306 /* 8 bit output, with a loop */
307 r = ppa_byte_out(ppb, buffer, len);
308 break;
309
310 case PPA_EPP_32:
311 case PPA_EPP_16:
312 case PPA_EPP_8:
313 epp_reset(ppb);
314 w_ctr(ppb, 0x4);
315#ifdef CONFIG_SCSI_IZIP_EPP16
316 if (!(((long) buffer | len) & 0x01))
317 outsw(ppb + 4, buffer, len >> 1);
318#else
319 if (!(((long) buffer | len) & 0x03))
320 outsl(ppb + 4, buffer, len >> 2);
321#endif
322 else
323 outsb(ppb + 4, buffer, len);
324 w_ctr(ppb, 0xc);
325 r = !(r_str(ppb) & 0x01);
326 w_ctr(ppb, 0xc);
327 ecp_sync(dev);
328 break;
329
330 default:
331 printk("PPA: bug in ppa_out()\n");
332 r = 0;
333 }
334 return r;
335}
336
337static int ppa_in(ppa_struct *dev, char *buffer, int len)
338{
339 int r;
340 unsigned short ppb = dev->base;
341
342 r = ppa_wait(dev);
343
344 if ((r & 0x50) != 0x50) {
345 ppa_fail(dev, DID_ERROR);
346 return 0;
347 }
348 switch (dev->mode) {
349 case PPA_NIBBLE:
350 /* 4 bit input, with a loop */
351 r = ppa_nibble_in(ppb, buffer, len);
352 w_ctr(ppb, 0xc);
353 break;
354
355 case PPA_PS2:
356 /* 8 bit input, with a loop */
357 w_ctr(ppb, 0x25);
358 r = ppa_byte_in(ppb, buffer, len);
359 w_ctr(ppb, 0x4);
360 w_ctr(ppb, 0xc);
361 break;
362
363 case PPA_EPP_32:
364 case PPA_EPP_16:
365 case PPA_EPP_8:
366 epp_reset(ppb);
367 w_ctr(ppb, 0x24);
368#ifdef CONFIG_SCSI_IZIP_EPP16
369 if (!(((long) buffer | len) & 0x01))
370 insw(ppb + 4, buffer, len >> 1);
371#else
372 if (!(((long) buffer | len) & 0x03))
373 insl(ppb + 4, buffer, len >> 2);
374#endif
375 else
376 insb(ppb + 4, buffer, len);
377 w_ctr(ppb, 0x2c);
378 r = !(r_str(ppb) & 0x01);
379 w_ctr(ppb, 0x2c);
380 ecp_sync(dev);
381 break;
382
383 default:
384 printk("PPA: bug in ppa_ins()\n");
385 r = 0;
386 break;
387 }
388 return r;
389}
390
391/* end of ppa_io.h */
392static inline void ppa_d_pulse(unsigned short ppb, unsigned char b)
393{
394 w_dtr(ppb, b);
395 w_ctr(ppb, 0xc);
396 w_ctr(ppb, 0xe);
397 w_ctr(ppb, 0xc);
398 w_ctr(ppb, 0x4);
399 w_ctr(ppb, 0xc);
400}
401
402static void ppa_disconnect(ppa_struct *dev)
403{
404 unsigned short ppb = dev->base;
405
406 ppa_d_pulse(ppb, 0);
407 ppa_d_pulse(ppb, 0x3c);
408 ppa_d_pulse(ppb, 0x20);
409 ppa_d_pulse(ppb, 0xf);
410}
411
412static inline void ppa_c_pulse(unsigned short ppb, unsigned char b)
413{
414 w_dtr(ppb, b);
415 w_ctr(ppb, 0x4);
416 w_ctr(ppb, 0x6);
417 w_ctr(ppb, 0x4);
418 w_ctr(ppb, 0xc);
419}
420
421static inline void ppa_connect(ppa_struct *dev, int flag)
422{
423 unsigned short ppb = dev->base;
424
425 ppa_c_pulse(ppb, 0);
426 ppa_c_pulse(ppb, 0x3c);
427 ppa_c_pulse(ppb, 0x20);
428 if ((flag == CONNECT_EPP_MAYBE) && IN_EPP_MODE(dev->mode))
429 ppa_c_pulse(ppb, 0xcf);
430 else
431 ppa_c_pulse(ppb, 0x8f);
432}
433
434static int ppa_select(ppa_struct *dev, int target)
435{
436 int k;
437 unsigned short ppb = dev->base;
438
439 /*
440 * Bit 6 (0x40) is the device selected bit.
441 * First we must wait till the current device goes off line...
442 */
443 k = PPA_SELECT_TMO;
444 do {
445 k--;
446 udelay(1);
447 } while ((r_str(ppb) & 0x40) && (k));
448 if (!k)
449 return 0;
450
451 w_dtr(ppb, (1 << target));
452 w_ctr(ppb, 0xe);
453 w_ctr(ppb, 0xc);
454 w_dtr(ppb, 0x80); /* This is NOT the initator */
455 w_ctr(ppb, 0x8);
456
457 k = PPA_SELECT_TMO;
458 do {
459 k--;
460 udelay(1);
461 }
462 while (!(r_str(ppb) & 0x40) && (k));
463 if (!k)
464 return 0;
465
466 return 1;
467}
468
469/*
470 * This is based on a trace of what the Iomega DOS 'guest' driver does.
471 * I've tried several different kinds of parallel ports with guest and
472 * coded this to react in the same ways that it does.
473 *
474 * The return value from this function is just a hint about where the
475 * handshaking failed.
476 *
477 */
478static int ppa_init(ppa_struct *dev)
479{
480 int retv;
481 unsigned short ppb = dev->base;
482
483 ppa_disconnect(dev);
484 ppa_connect(dev, CONNECT_NORMAL);
485
486 retv = 2; /* Failed */
487
488 w_ctr(ppb, 0xe);
489 if ((r_str(ppb) & 0x08) == 0x08)
490 retv--;
491
492 w_ctr(ppb, 0xc);
493 if ((r_str(ppb) & 0x08) == 0x00)
494 retv--;
495
496 if (!retv)
497 ppa_reset_pulse(ppb);
498 udelay(1000); /* Allow devices to settle down */
499 ppa_disconnect(dev);
500 udelay(1000); /* Another delay to allow devices to settle */
501
502 if (retv)
503 return -EIO;
504
505 return device_check(dev);
506}
507
508static inline int ppa_send_command(struct scsi_cmnd *cmd)
509{
510 ppa_struct *dev = ppa_dev(cmd->device->host);
511 int k;
512
513 w_ctr(dev->base, 0x0c);
514
515 for (k = 0; k < cmd->cmd_len; k++)
516 if (!ppa_out(dev, &cmd->cmnd[k], 1))
517 return 0;
518 return 1;
519}
520
521/*
522 * The bulk flag enables some optimisations in the data transfer loops,
523 * it should be true for any command that transfers data in integral
524 * numbers of sectors.
525 *
526 * The driver appears to remain stable if we speed up the parallel port
527 * i/o in this function, but not elsewhere.
528 */
529static int ppa_completion(struct scsi_cmnd *cmd)
530{
531 /* Return codes:
532 * -1 Error
533 * 0 Told to schedule
534 * 1 Finished data transfer
535 */
536 ppa_struct *dev = ppa_dev(cmd->device->host);
537 unsigned short ppb = dev->base;
538 unsigned long start_jiffies = jiffies;
539
540 unsigned char r, v;
541 int fast, bulk, status;
542
543 v = cmd->cmnd[0];
544 bulk = ((v == READ_6) ||
545 (v == READ_10) || (v == WRITE_6) || (v == WRITE_10));
546
547 /*
548 * We only get here if the drive is ready to comunicate,
549 * hence no need for a full ppa_wait.
550 */
551 r = (r_str(ppb) & 0xf0);
552
553 while (r != (unsigned char) 0xf0) {
554 /*
555 * If we have been running for more than a full timer tick
556 * then take a rest.
557 */
558 if (time_after(jiffies, start_jiffies + 1))
559 return 0;
560
561 if ((cmd->SCp.this_residual <= 0)) {
562 ppa_fail(dev, DID_ERROR);
563 return -1; /* ERROR_RETURN */
564 }
565
566 /* On some hardware we have SCSI disconnected (6th bit low)
567 * for about 100usecs. It is too expensive to wait a
568 * tick on every loop so we busy wait for no more than
569 * 500usecs to give the drive a chance first. We do not
570 * change things for "normal" hardware since generally
571 * the 6th bit is always high.
572 * This makes the CPU load higher on some hardware
573 * but otherwise we can not get more than 50K/secs
574 * on this problem hardware.
575 */
576 if ((r & 0xc0) != 0xc0) {
577 /* Wait for reconnection should be no more than
578 * jiffy/2 = 5ms = 5000 loops
579 */
580 unsigned long k = dev->recon_tmo;
581 for (; k && ((r = (r_str(ppb) & 0xf0)) & 0xc0) != 0xc0;
582 k--)
583 udelay(1);
584
585 if (!k)
586 return 0;
587 }
588
589 /* determine if we should use burst I/O */
590 fast = (bulk && (cmd->SCp.this_residual >= PPA_BURST_SIZE))
591 ? PPA_BURST_SIZE : 1;
592
593 if (r == (unsigned char) 0xc0)
594 status = ppa_out(dev, cmd->SCp.ptr, fast);
595 else
596 status = ppa_in(dev, cmd->SCp.ptr, fast);
597
598 cmd->SCp.ptr += fast;
599 cmd->SCp.this_residual -= fast;
600
601 if (!status) {
602 ppa_fail(dev, DID_BUS_BUSY);
603 return -1; /* ERROR_RETURN */
604 }
605 if (cmd->SCp.buffer && !cmd->SCp.this_residual) {
606 /* if scatter/gather, advance to the next segment */
607 if (cmd->SCp.buffers_residual--) {
608 cmd->SCp.buffer++;
609 cmd->SCp.this_residual =
610 cmd->SCp.buffer->length;
611 cmd->SCp.ptr =
612 page_address(cmd->SCp.buffer->page) +
613 cmd->SCp.buffer->offset;
614 }
615 }
616 /* Now check to see if the drive is ready to comunicate */
617 r = (r_str(ppb) & 0xf0);
618 /* If not, drop back down to the scheduler and wait a timer tick */
619 if (!(r & 0x80))
620 return 0;
621 }
622 return 1; /* FINISH_RETURN */
623}
624
625/*
626 * Since the PPA itself doesn't generate interrupts, we use
627 * the scheduler's task queue to generate a stream of call-backs and
628 * complete the request when the drive is ready.
629 */
David Howellsc4028952006-11-22 14:57:56 +0000630static void ppa_interrupt(struct work_struct *work)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700631{
David Howellsc4028952006-11-22 14:57:56 +0000632 ppa_struct *dev = container_of(work, ppa_struct, ppa_tq.work);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700633 struct scsi_cmnd *cmd = dev->cur_cmd;
634
635 if (!cmd) {
636 printk("PPA: bug in ppa_interrupt\n");
637 return;
638 }
639 if (ppa_engine(dev, cmd)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700640 schedule_delayed_work(&dev->ppa_tq, 1);
641 return;
642 }
643 /* Command must of completed hence it is safe to let go... */
644#if PPA_DEBUG > 0
645 switch ((cmd->result >> 16) & 0xff) {
646 case DID_OK:
647 break;
648 case DID_NO_CONNECT:
649 printk("ppa: no device at SCSI ID %i\n", cmd->device->target);
650 break;
651 case DID_BUS_BUSY:
652 printk("ppa: BUS BUSY - EPP timeout detected\n");
653 break;
654 case DID_TIME_OUT:
655 printk("ppa: unknown timeout\n");
656 break;
657 case DID_ABORT:
658 printk("ppa: told to abort\n");
659 break;
660 case DID_PARITY:
661 printk("ppa: parity error (???)\n");
662 break;
663 case DID_ERROR:
664 printk("ppa: internal driver error\n");
665 break;
666 case DID_RESET:
667 printk("ppa: told to reset device\n");
668 break;
669 case DID_BAD_INTR:
670 printk("ppa: bad interrupt (???)\n");
671 break;
672 default:
673 printk("ppa: bad return code (%02x)\n",
674 (cmd->result >> 16) & 0xff);
675 }
676#endif
677
678 if (cmd->SCp.phase > 1)
679 ppa_disconnect(dev);
680
681 ppa_pb_dismiss(dev);
682
683 dev->cur_cmd = NULL;
684
685 cmd->scsi_done(cmd);
686}
687
688static int ppa_engine(ppa_struct *dev, struct scsi_cmnd *cmd)
689{
690 unsigned short ppb = dev->base;
691 unsigned char l = 0, h = 0;
692 int retv;
693
694 /* First check for any errors that may of occurred
695 * Here we check for internal errors
696 */
697 if (dev->failed)
698 return 0;
699
700 switch (cmd->SCp.phase) {
701 case 0: /* Phase 0 - Waiting for parport */
702 if (time_after(jiffies, dev->jstart + HZ)) {
703 /*
704 * We waited more than a second
705 * for parport to call us
706 */
707 ppa_fail(dev, DID_BUS_BUSY);
708 return 0;
709 }
710 return 1; /* wait until ppa_wakeup claims parport */
711 case 1: /* Phase 1 - Connected */
712 { /* Perform a sanity check for cable unplugged */
713 int retv = 2; /* Failed */
714
715 ppa_connect(dev, CONNECT_EPP_MAYBE);
716
717 w_ctr(ppb, 0xe);
718 if ((r_str(ppb) & 0x08) == 0x08)
719 retv--;
720
721 w_ctr(ppb, 0xc);
722 if ((r_str(ppb) & 0x08) == 0x00)
723 retv--;
724
725 if (retv) {
Marcelo Feitoza Parisi60c904a2006-03-28 01:56:47 -0800726 if (time_after(jiffies, dev->jstart + (1 * HZ))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700727 printk
728 ("ppa: Parallel port cable is unplugged!!\n");
729 ppa_fail(dev, DID_BUS_BUSY);
730 return 0;
731 } else {
732 ppa_disconnect(dev);
733 return 1; /* Try again in a jiffy */
734 }
735 }
736 cmd->SCp.phase++;
737 }
738
739 case 2: /* Phase 2 - We are now talking to the scsi bus */
Jeff Garzik422c0d62005-10-24 18:05:09 -0400740 if (!ppa_select(dev, scmd_id(cmd))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700741 ppa_fail(dev, DID_NO_CONNECT);
742 return 0;
743 }
744 cmd->SCp.phase++;
745
746 case 3: /* Phase 3 - Ready to accept a command */
747 w_ctr(ppb, 0x0c);
748 if (!(r_str(ppb) & 0x80))
749 return 1;
750
751 if (!ppa_send_command(cmd))
752 return 0;
753 cmd->SCp.phase++;
754
755 case 4: /* Phase 4 - Setup scatter/gather buffers */
756 if (cmd->use_sg) {
757 /* if many buffers are available, start filling the first */
758 cmd->SCp.buffer =
759 (struct scatterlist *) cmd->request_buffer;
760 cmd->SCp.this_residual = cmd->SCp.buffer->length;
761 cmd->SCp.ptr =
762 page_address(cmd->SCp.buffer->page) +
763 cmd->SCp.buffer->offset;
764 } else {
765 /* else fill the only available buffer */
766 cmd->SCp.buffer = NULL;
767 cmd->SCp.this_residual = cmd->request_bufflen;
768 cmd->SCp.ptr = cmd->request_buffer;
769 }
770 cmd->SCp.buffers_residual = cmd->use_sg - 1;
771 cmd->SCp.phase++;
772
773 case 5: /* Phase 5 - Data transfer stage */
774 w_ctr(ppb, 0x0c);
775 if (!(r_str(ppb) & 0x80))
776 return 1;
777
778 retv = ppa_completion(cmd);
779 if (retv == -1)
780 return 0;
781 if (retv == 0)
782 return 1;
783 cmd->SCp.phase++;
784
785 case 6: /* Phase 6 - Read status/message */
786 cmd->result = DID_OK << 16;
787 /* Check for data overrun */
788 if (ppa_wait(dev) != (unsigned char) 0xf0) {
789 ppa_fail(dev, DID_ERROR);
790 return 0;
791 }
792 if (ppa_in(dev, &l, 1)) { /* read status byte */
793 /* Check for optional message byte */
794 if (ppa_wait(dev) == (unsigned char) 0xf0)
795 ppa_in(dev, &h, 1);
796 cmd->result =
797 (DID_OK << 16) + (h << 8) + (l & STATUS_MASK);
798 }
799 return 0; /* Finished */
800 break;
801
802 default:
803 printk("ppa: Invalid scsi phase\n");
804 }
805 return 0;
806}
807
808static int ppa_queuecommand(struct scsi_cmnd *cmd,
809 void (*done) (struct scsi_cmnd *))
810{
811 ppa_struct *dev = ppa_dev(cmd->device->host);
812
813 if (dev->cur_cmd) {
814 printk("PPA: bug in ppa_queuecommand\n");
815 return 0;
816 }
817 dev->failed = 0;
818 dev->jstart = jiffies;
819 dev->cur_cmd = cmd;
820 cmd->scsi_done = done;
821 cmd->result = DID_ERROR << 16; /* default return code */
822 cmd->SCp.phase = 0; /* bus free */
823
David Howellsc4028952006-11-22 14:57:56 +0000824 schedule_delayed_work(&dev->ppa_tq, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700825
826 ppa_pb_claim(dev);
827
828 return 0;
829}
830
831/*
832 * Apparently the disk->capacity attribute is off by 1 sector
833 * for all disk drives. We add the one here, but it should really
834 * be done in sd.c. Even if it gets fixed there, this will still
835 * work.
836 */
837static int ppa_biosparam(struct scsi_device *sdev, struct block_device *dev,
838 sector_t capacity, int ip[])
839{
840 ip[0] = 0x40;
841 ip[1] = 0x20;
842 ip[2] = ((unsigned long) capacity + 1) / (ip[0] * ip[1]);
843 if (ip[2] > 1024) {
844 ip[0] = 0xff;
845 ip[1] = 0x3f;
846 ip[2] = ((unsigned long) capacity + 1) / (ip[0] * ip[1]);
847 if (ip[2] > 1023)
848 ip[2] = 1023;
849 }
850 return 0;
851}
852
853static int ppa_abort(struct scsi_cmnd *cmd)
854{
855 ppa_struct *dev = ppa_dev(cmd->device->host);
856 /*
857 * There is no method for aborting commands since Iomega
858 * have tied the SCSI_MESSAGE line high in the interface
859 */
860
861 switch (cmd->SCp.phase) {
862 case 0: /* Do not have access to parport */
863 case 1: /* Have not connected to interface */
864 dev->cur_cmd = NULL; /* Forget the problem */
865 return SUCCESS;
866 break;
867 default: /* SCSI command sent, can not abort */
868 return FAILED;
869 break;
870 }
871}
872
873static void ppa_reset_pulse(unsigned int base)
874{
875 w_dtr(base, 0x40);
876 w_ctr(base, 0x8);
877 udelay(30);
878 w_ctr(base, 0xc);
879}
880
881static int ppa_reset(struct scsi_cmnd *cmd)
882{
883 ppa_struct *dev = ppa_dev(cmd->device->host);
884
885 if (cmd->SCp.phase)
886 ppa_disconnect(dev);
887 dev->cur_cmd = NULL; /* Forget the problem */
888
889 ppa_connect(dev, CONNECT_NORMAL);
890 ppa_reset_pulse(dev->base);
Jeff Garzik 68b3aa72005-05-28 07:56:31 -0400891 mdelay(1); /* device settle delay */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700892 ppa_disconnect(dev);
Jeff Garzik 68b3aa72005-05-28 07:56:31 -0400893 mdelay(1); /* device settle delay */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700894 return SUCCESS;
895}
896
897static int device_check(ppa_struct *dev)
898{
899 /* This routine looks for a device and then attempts to use EPP
900 to send a command. If all goes as planned then EPP is available. */
901
902 static char cmd[6] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
903 int loop, old_mode, status, k, ppb = dev->base;
904 unsigned char l;
905
906 old_mode = dev->mode;
907 for (loop = 0; loop < 8; loop++) {
908 /* Attempt to use EPP for Test Unit Ready */
909 if ((ppb & 0x0007) == 0x0000)
910 dev->mode = PPA_EPP_32;
911
912 second_pass:
913 ppa_connect(dev, CONNECT_EPP_MAYBE);
914 /* Select SCSI device */
915 if (!ppa_select(dev, loop)) {
916 ppa_disconnect(dev);
917 continue;
918 }
919 printk("ppa: Found device at ID %i, Attempting to use %s\n",
920 loop, PPA_MODE_STRING[dev->mode]);
921
922 /* Send SCSI command */
923 status = 1;
924 w_ctr(ppb, 0x0c);
925 for (l = 0; (l < 6) && (status); l++)
926 status = ppa_out(dev, cmd, 1);
927
928 if (!status) {
929 ppa_disconnect(dev);
930 ppa_connect(dev, CONNECT_EPP_MAYBE);
931 w_dtr(ppb, 0x40);
932 w_ctr(ppb, 0x08);
933 udelay(30);
934 w_ctr(ppb, 0x0c);
935 udelay(1000);
936 ppa_disconnect(dev);
937 udelay(1000);
938 if (dev->mode == PPA_EPP_32) {
939 dev->mode = old_mode;
940 goto second_pass;
941 }
942 return -EIO;
943 }
944 w_ctr(ppb, 0x0c);
945 k = 1000000; /* 1 Second */
946 do {
947 l = r_str(ppb);
948 k--;
949 udelay(1);
950 } while (!(l & 0x80) && (k));
951
952 l &= 0xf0;
953
954 if (l != 0xf0) {
955 ppa_disconnect(dev);
956 ppa_connect(dev, CONNECT_EPP_MAYBE);
957 ppa_reset_pulse(ppb);
958 udelay(1000);
959 ppa_disconnect(dev);
960 udelay(1000);
961 if (dev->mode == PPA_EPP_32) {
962 dev->mode = old_mode;
963 goto second_pass;
964 }
965 return -EIO;
966 }
967 ppa_disconnect(dev);
968 printk("ppa: Communication established with ID %i using %s\n",
969 loop, PPA_MODE_STRING[dev->mode]);
970 ppa_connect(dev, CONNECT_EPP_MAYBE);
971 ppa_reset_pulse(ppb);
972 udelay(1000);
973 ppa_disconnect(dev);
974 udelay(1000);
975 return 0;
976 }
977 return -ENODEV;
978}
979
Randy.Dunlap78a904b2006-05-19 10:11:02 -0700980static int ppa_adjust_queue(struct scsi_device *device)
981{
982 blk_queue_bounce_limit(device->request_queue, BLK_BOUNCE_HIGH);
983 return 0;
984}
985
Linus Torvalds1da177e2005-04-16 15:20:36 -0700986static struct scsi_host_template ppa_template = {
987 .module = THIS_MODULE,
988 .proc_name = "ppa",
989 .proc_info = ppa_proc_info,
990 .name = "Iomega VPI0 (ppa) interface",
991 .queuecommand = ppa_queuecommand,
992 .eh_abort_handler = ppa_abort,
993 .eh_bus_reset_handler = ppa_reset,
994 .eh_host_reset_handler = ppa_reset,
995 .bios_param = ppa_biosparam,
996 .this_id = -1,
997 .sg_tablesize = SG_ALL,
998 .cmd_per_lun = 1,
999 .use_clustering = ENABLE_CLUSTERING,
1000 .can_queue = 1,
Randy.Dunlap78a904b2006-05-19 10:11:02 -07001001 .slave_alloc = ppa_adjust_queue,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001002};
1003
1004/***************************************************************************
1005 * Parallel port probing routines *
1006 ***************************************************************************/
1007
1008static LIST_HEAD(ppa_hosts);
1009
1010static int __ppa_attach(struct parport *pb)
1011{
1012 struct Scsi_Host *host;
Peter Zijlstra7259f0d2006-10-29 22:46:36 -08001013 DECLARE_WAIT_QUEUE_HEAD_ONSTACK(waiting);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001014 DEFINE_WAIT(wait);
1015 ppa_struct *dev;
1016 int ports;
1017 int modes, ppb, ppb_hi;
1018 int err = -ENOMEM;
1019
1020 dev = kmalloc(sizeof(ppa_struct), GFP_KERNEL);
1021 if (!dev)
1022 return -ENOMEM;
1023 memset(dev, 0, sizeof(ppa_struct));
1024 dev->base = -1;
1025 dev->mode = PPA_AUTODETECT;
1026 dev->recon_tmo = PPA_RECON_TMO;
1027 init_waitqueue_head(&waiting);
1028 dev->dev = parport_register_device(pb, "ppa", NULL, ppa_wakeup,
1029 NULL, 0, dev);
1030
1031 if (!dev->dev)
1032 goto out;
1033
1034 /* Claim the bus so it remembers what we do to the control
1035 * registers. [ CTR and ECP ]
1036 */
1037 err = -EBUSY;
1038 dev->waiting = &waiting;
1039 prepare_to_wait(&waiting, &wait, TASK_UNINTERRUPTIBLE);
1040 if (ppa_pb_claim(dev))
1041 schedule_timeout(3 * HZ);
1042 if (dev->wanted) {
1043 printk(KERN_ERR "ppa%d: failed to claim parport because "
1044 "a pardevice is owning the port for too long "
1045 "time!\n", pb->number);
1046 ppa_pb_dismiss(dev);
1047 dev->waiting = NULL;
1048 finish_wait(&waiting, &wait);
1049 goto out1;
1050 }
1051 dev->waiting = NULL;
1052 finish_wait(&waiting, &wait);
1053 ppb = dev->base = dev->dev->port->base;
1054 ppb_hi = dev->dev->port->base_hi;
1055 w_ctr(ppb, 0x0c);
1056 modes = dev->dev->port->modes;
1057
1058 /* Mode detection works up the chain of speed
1059 * This avoids a nasty if-then-else-if-... tree
1060 */
1061 dev->mode = PPA_NIBBLE;
1062
1063 if (modes & PARPORT_MODE_TRISTATE)
1064 dev->mode = PPA_PS2;
1065
1066 if (modes & PARPORT_MODE_ECP) {
1067 w_ecr(ppb_hi, 0x20);
1068 dev->mode = PPA_PS2;
1069 }
1070 if ((modes & PARPORT_MODE_EPP) && (modes & PARPORT_MODE_ECP))
1071 w_ecr(ppb_hi, 0x80);
1072
1073 /* Done configuration */
1074
1075 err = ppa_init(dev);
1076 ppa_pb_release(dev);
1077
1078 if (err)
1079 goto out1;
1080
1081 /* now the glue ... */
1082 if (dev->mode == PPA_NIBBLE || dev->mode == PPA_PS2)
1083 ports = 3;
1084 else
1085 ports = 8;
1086
David Howellsc4028952006-11-22 14:57:56 +00001087 INIT_DELAYED_WORK(&dev->ppa_tq, ppa_interrupt);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001088
1089 err = -ENOMEM;
1090 host = scsi_host_alloc(&ppa_template, sizeof(ppa_struct *));
1091 if (!host)
1092 goto out1;
1093 host->io_port = pb->base;
1094 host->n_io_port = ports;
1095 host->dma_channel = -1;
1096 host->unique_id = pb->number;
1097 *(ppa_struct **)&host->hostdata = dev;
1098 dev->host = host;
1099 list_add_tail(&dev->list, &ppa_hosts);
1100 err = scsi_add_host(host, NULL);
1101 if (err)
1102 goto out2;
1103 scsi_scan_host(host);
1104 return 0;
1105out2:
1106 list_del_init(&dev->list);
1107 scsi_host_put(host);
1108out1:
1109 parport_unregister_device(dev->dev);
1110out:
1111 kfree(dev);
1112 return err;
1113}
1114
1115static void ppa_attach(struct parport *pb)
1116{
1117 __ppa_attach(pb);
1118}
1119
1120static void ppa_detach(struct parport *pb)
1121{
1122 ppa_struct *dev;
1123 list_for_each_entry(dev, &ppa_hosts, list) {
1124 if (dev->dev->port == pb) {
1125 list_del_init(&dev->list);
1126 scsi_remove_host(dev->host);
1127 scsi_host_put(dev->host);
1128 parport_unregister_device(dev->dev);
1129 kfree(dev);
1130 break;
1131 }
1132 }
1133}
1134
1135static struct parport_driver ppa_driver = {
1136 .name = "ppa",
1137 .attach = ppa_attach,
1138 .detach = ppa_detach,
1139};
1140
1141static int __init ppa_driver_init(void)
1142{
1143 printk("ppa: Version %s\n", PPA_VERSION);
1144 return parport_register_driver(&ppa_driver);
1145}
1146
1147static void __exit ppa_driver_exit(void)
1148{
1149 parport_unregister_driver(&ppa_driver);
1150}
1151
1152module_init(ppa_driver_init);
1153module_exit(ppa_driver_exit);
1154MODULE_LICENSE("GPL");