TTY: serial, remove dead code from 68328
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / scsi / ppa.c
blobd164c9639361c773fb41717509608587cb2ab9a6
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 */
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>
22 #include <scsi/scsi.h>
23 #include <scsi/scsi_cmnd.h>
24 #include <scsi/scsi_device.h>
25 #include <scsi/scsi_host.h>
28 static void ppa_reset_pulse(unsigned int base);
30 typedef 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;
45 #include "ppa.h"
47 static inline ppa_struct *ppa_dev(struct Scsi_Host *host)
49 return *(ppa_struct **)&host->hostdata;
52 static DEFINE_SPINLOCK(arbitration_lock);
54 static void got_it(ppa_struct *dev)
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);
63 static void ppa_wakeup(void *ref)
65 ppa_struct *dev = (ppa_struct *) ref;
66 unsigned long flags;
68 spin_lock_irqsave(&arbitration_lock, flags);
69 if (dev->wanted) {
70 parport_claim(dev->dev);
71 got_it(dev);
72 dev->wanted = 0;
74 spin_unlock_irqrestore(&arbitration_lock, flags);
75 return;
78 static int ppa_pb_claim(ppa_struct *dev)
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;
87 dev->wanted = res;
88 spin_unlock_irqrestore(&arbitration_lock, flags);
89 return res;
92 static void ppa_pb_dismiss(ppa_struct *dev)
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);
104 static inline void ppa_pb_release(ppa_struct *dev)
106 parport_release(dev->dev);
110 * Start of Chipset kludges
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)
121 static inline int ppa_proc_write(ppa_struct *dev, char *buffer, int length)
123 unsigned long x;
125 if ((length > 5) && (strncmp(buffer, "mode=", 5) == 0)) {
126 x = simple_strtoul(buffer + 5, NULL, 0);
127 dev->mode = x;
128 return length;
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;
136 printk(KERN_WARNING "ppa /proc: invalid variable\n");
137 return -EINVAL;
140 static int ppa_proc_info(struct Scsi_Host *host, char *buffer, char **start, off_t offset, int length, int inout)
142 int len = 0;
143 ppa_struct *dev = ppa_dev(host);
145 if (inout)
146 return ppa_proc_write(dev, buffer, length);
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
160 /* Request for beyond end of buffer */
161 if (offset > length)
162 return 0;
164 *start = buffer + offset;
165 len -= offset;
166 if (len > length)
167 len = length;
168 return len;
171 static int device_check(ppa_struct *dev);
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);
176 static inline void ppa_fail_func(ppa_struct *dev, int error_code)
177 #else
178 static inline void ppa_fail(ppa_struct *dev, int error_code)
179 #endif
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;
189 * Wait for the high bit to be set.
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.
195 static unsigned char ppa_wait(ppa_struct *dev)
197 int k;
198 unsigned short ppb = dev->base;
199 unsigned char r;
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);
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
215 if (k)
216 return (r & 0xf0);
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 */
225 * Clear EPP Timeout Bit
227 static inline void epp_reset(unsigned short ppb)
229 int i;
231 i = r_str(ppb);
232 w_str(ppb, i);
233 w_str(ppb, i & 0xfe);
237 * Wait for empty ECP fifo (if we are in ECP fifo mode only)
239 static inline void ecp_sync(ppa_struct *dev)
241 int i, ppb_hi = dev->dev->port->base_hi;
243 if (ppb_hi == 0)
244 return;
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);
252 printk(KERN_WARNING "ppa: ECP sync failed as data still present in FIFO.\n");
256 static int ppa_byte_out(unsigned short base, const char *buffer, int len)
258 int i;
260 for (i = len; i; i--) {
261 w_dtr(base, *buffer++);
262 w_ctr(base, 0xe);
263 w_ctr(base, 0xc);
265 return 1; /* All went well - we hope! */
268 static int ppa_byte_in(unsigned short base, char *buffer, int len)
270 int i;
272 for (i = len; i; i--) {
273 *buffer++ = r_dtr(base);
274 w_ctr(base, 0x27);
275 w_ctr(base, 0x25);
277 return 1; /* All went well - we hope! */
280 static int ppa_nibble_in(unsigned short base, char *buffer, int len)
282 for (; len; len--) {
283 unsigned char h;
285 w_ctr(base, 0x4);
286 h = r_str(base) & 0xf0;
287 w_ctr(base, 0x6);
288 *buffer++ = h | ((r_str(base) & 0xf0) >> 4);
290 return 1; /* All went well - we hope! */
293 static int ppa_out(ppa_struct *dev, char *buffer, int len)
295 int r;
296 unsigned short ppb = dev->base;
298 r = ppa_wait(dev);
300 if ((r & 0x50) != 0x40) {
301 ppa_fail(dev, DID_ERROR);
302 return 0;
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;
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;
331 default:
332 printk(KERN_ERR "PPA: bug in ppa_out()\n");
333 r = 0;
335 return r;
338 static int ppa_in(ppa_struct *dev, char *buffer, int len)
340 int r;
341 unsigned short ppb = dev->base;
343 r = ppa_wait(dev);
345 if ((r & 0x50) != 0x50) {
346 ppa_fail(dev, DID_ERROR);
347 return 0;
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;
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;
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;
384 default:
385 printk(KERN_ERR "PPA: bug in ppa_ins()\n");
386 r = 0;
387 break;
389 return r;
392 /* end of ppa_io.h */
393 static inline void ppa_d_pulse(unsigned short ppb, unsigned char b)
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);
403 static void ppa_disconnect(ppa_struct *dev)
405 unsigned short ppb = dev->base;
407 ppa_d_pulse(ppb, 0);
408 ppa_d_pulse(ppb, 0x3c);
409 ppa_d_pulse(ppb, 0x20);
410 ppa_d_pulse(ppb, 0xf);
413 static inline void ppa_c_pulse(unsigned short ppb, unsigned char b)
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);
422 static inline void ppa_connect(ppa_struct *dev, int flag)
424 unsigned short ppb = dev->base;
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);
435 static int ppa_select(ppa_struct *dev, int target)
437 int k;
438 unsigned short ppb = dev->base;
441 * Bit 6 (0x40) is the device selected bit.
442 * First we must wait till the current device goes off line...
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;
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);
458 k = PPA_SELECT_TMO;
459 do {
460 k--;
461 udelay(1);
463 while (!(r_str(ppb) & 0x40) && (k));
464 if (!k)
465 return 0;
467 return 1;
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.
475 * The return value from this function is just a hint about where the
476 * handshaking failed.
479 static int ppa_init(ppa_struct *dev)
481 int retv;
482 unsigned short ppb = dev->base;
484 ppa_disconnect(dev);
485 ppa_connect(dev, CONNECT_NORMAL);
487 retv = 2; /* Failed */
489 w_ctr(ppb, 0xe);
490 if ((r_str(ppb) & 0x08) == 0x08)
491 retv--;
493 w_ctr(ppb, 0xc);
494 if ((r_str(ppb) & 0x08) == 0x00)
495 retv--;
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 */
503 if (retv)
504 return -EIO;
506 return device_check(dev);
509 static inline int ppa_send_command(struct scsi_cmnd *cmd)
511 ppa_struct *dev = ppa_dev(cmd->device->host);
512 int k;
514 w_ctr(dev->base, 0x0c);
516 for (k = 0; k < cmd->cmd_len; k++)
517 if (!ppa_out(dev, &cmd->cmnd[k], 1))
518 return 0;
519 return 1;
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.
527 * The driver appears to remain stable if we speed up the parallel port
528 * i/o in this function, but not elsewhere.
530 static int ppa_completion(struct scsi_cmnd *cmd)
532 /* Return codes:
533 * -1 Error
534 * 0 Told to schedule
535 * 1 Finished data transfer
537 ppa_struct *dev = ppa_dev(cmd->device->host);
538 unsigned short ppb = dev->base;
539 unsigned long start_jiffies = jiffies;
541 unsigned char r, v;
542 int fast, bulk, status;
544 v = cmd->cmnd[0];
545 bulk = ((v == READ_6) ||
546 (v == READ_10) || (v == WRITE_6) || (v == WRITE_10));
549 * We only get here if the drive is ready to comunicate,
550 * hence no need for a full ppa_wait.
552 r = (r_str(ppb) & 0xf0);
554 while (r != (unsigned char) 0xf0) {
556 * If we have been running for more than a full timer tick
557 * then take a rest.
559 if (time_after(jiffies, start_jiffies + 1))
560 return 0;
562 if ((cmd->SCp.this_residual <= 0)) {
563 ppa_fail(dev, DID_ERROR);
564 return -1; /* ERROR_RETURN */
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.
577 if ((r & 0xc0) != 0xc0) {
578 /* Wait for reconnection should be no more than
579 * jiffy/2 = 5ms = 5000 loops
581 unsigned long k = dev->recon_tmo;
582 for (; k && ((r = (r_str(ppb) & 0xf0)) & 0xc0) != 0xc0;
583 k--)
584 udelay(1);
586 if (!k)
587 return 0;
590 /* determine if we should use burst I/O */
591 fast = (bulk && (cmd->SCp.this_residual >= PPA_BURST_SIZE))
592 ? PPA_BURST_SIZE : 1;
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);
599 cmd->SCp.ptr += fast;
600 cmd->SCp.this_residual -= fast;
602 if (!status) {
603 ppa_fail(dev, DID_BUS_BUSY);
604 return -1; /* ERROR_RETURN */
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);
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;
621 return 1; /* FINISH_RETURN */
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.
629 static void ppa_interrupt(struct work_struct *work)
631 ppa_struct *dev = container_of(work, ppa_struct, ppa_tq.work);
632 struct scsi_cmnd *cmd = dev->cur_cmd;
634 if (!cmd) {
635 printk(KERN_ERR "PPA: bug in ppa_interrupt\n");
636 return;
638 if (ppa_engine(dev, cmd)) {
639 schedule_delayed_work(&dev->ppa_tq, 1);
640 return;
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);
675 #endif
677 if (cmd->SCp.phase > 1)
678 ppa_disconnect(dev);
680 ppa_pb_dismiss(dev);
682 dev->cur_cmd = NULL;
684 cmd->scsi_done(cmd);
687 static int ppa_engine(ppa_struct *dev, struct scsi_cmnd *cmd)
689 unsigned short ppb = dev->base;
690 unsigned char l = 0, h = 0;
691 int retv;
693 /* First check for any errors that may of occurred
694 * Here we check for internal errors
696 if (dev->failed)
697 return 0;
699 switch (cmd->SCp.phase) {
700 case 0: /* Phase 0 - Waiting for parport */
701 if (time_after(jiffies, dev->jstart + HZ)) {
703 * We waited more than a second
704 * for parport to call us
706 ppa_fail(dev, DID_BUS_BUSY);
707 return 0;
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 */
714 ppa_connect(dev, CONNECT_EPP_MAYBE);
716 w_ctr(ppb, 0xe);
717 if ((r_str(ppb) & 0x08) == 0x08)
718 retv--;
720 w_ctr(ppb, 0xc);
721 if ((r_str(ppb) & 0x08) == 0x00)
722 retv--;
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 */
734 cmd->SCp.phase++;
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;
742 cmd->SCp.phase++;
744 case 3: /* Phase 3 - Ready to accept a command */
745 w_ctr(ppb, 0x0c);
746 if (!(r_str(ppb) & 0x80))
747 return 1;
749 if (!ppa_send_command(cmd))
750 return 0;
751 cmd->SCp.phase++;
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;
763 cmd->SCp.buffers_residual = scsi_sg_count(cmd) - 1;
764 cmd->SCp.phase++;
766 case 5: /* Phase 5 - Data transfer stage */
767 w_ctr(ppb, 0x0c);
768 if (!(r_str(ppb) & 0x80))
769 return 1;
771 retv = ppa_completion(cmd);
772 if (retv == -1)
773 return 0;
774 if (retv == 0)
775 return 1;
776 cmd->SCp.phase++;
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;
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);
792 return 0; /* Finished */
793 break;
795 default:
796 printk(KERN_ERR "ppa: Invalid scsi phase\n");
798 return 0;
801 static int ppa_queuecommand_lck(struct scsi_cmnd *cmd,
802 void (*done) (struct scsi_cmnd *))
804 ppa_struct *dev = ppa_dev(cmd->device->host);
806 if (dev->cur_cmd) {
807 printk(KERN_ERR "PPA: bug in ppa_queuecommand\n");
808 return 0;
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 */
817 schedule_delayed_work(&dev->ppa_tq, 0);
819 ppa_pb_claim(dev);
821 return 0;
824 static DEF_SCSI_QCMD(ppa_queuecommand)
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.
832 static int ppa_biosparam(struct scsi_device *sdev, struct block_device *dev,
833 sector_t capacity, int ip[])
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;
845 return 0;
848 static int ppa_abort(struct scsi_cmnd *cmd)
850 ppa_struct *dev = ppa_dev(cmd->device->host);
852 * There is no method for aborting commands since Iomega
853 * have tied the SCSI_MESSAGE line high in the interface
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;
868 static void ppa_reset_pulse(unsigned int base)
870 w_dtr(base, 0x40);
871 w_ctr(base, 0x8);
872 udelay(30);
873 w_ctr(base, 0xc);
876 static int ppa_reset(struct scsi_cmnd *cmd)
878 ppa_struct *dev = ppa_dev(cmd->device->host);
880 if (cmd->SCp.phase)
881 ppa_disconnect(dev);
882 dev->cur_cmd = NULL; /* Forget the problem */
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;
892 static int device_check(ppa_struct *dev)
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. */
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;
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;
907 second_pass:
908 ppa_connect(dev, CONNECT_EPP_MAYBE);
909 /* Select SCSI device */
910 if (!ppa_select(dev, loop)) {
911 ppa_disconnect(dev);
912 continue;
914 printk(KERN_INFO "ppa: Found device at ID %i, Attempting to use %s\n",
915 loop, PPA_MODE_STRING[dev->mode]);
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);
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;
937 return -EIO;
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));
947 l &= 0xf0;
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;
960 return -EIO;
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;
972 return -ENODEV;
975 static int ppa_adjust_queue(struct scsi_device *device)
977 blk_queue_bounce_limit(device->request_queue, BLK_BOUNCE_HIGH);
978 return 0;
981 static 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,
999 /***************************************************************************
1000 * Parallel port probing routines *
1001 ***************************************************************************/
1003 static LIST_HEAD(ppa_hosts);
1005 static int __ppa_attach(struct parport *pb)
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;
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);
1025 if (!dev->dev)
1026 goto out;
1028 /* Claim the bus so it remembers what we do to the control
1029 * registers. [ CTR and ECP ]
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;
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;
1052 /* Mode detection works up the chain of speed
1053 * This avoids a nasty if-then-else-if-... tree
1055 dev->mode = PPA_NIBBLE;
1057 if (modes & PARPORT_MODE_TRISTATE)
1058 dev->mode = PPA_PS2;
1060 if (modes & PARPORT_MODE_ECP) {
1061 w_ecr(ppb_hi, 0x20);
1062 dev->mode = PPA_PS2;
1064 if ((modes & PARPORT_MODE_EPP) && (modes & PARPORT_MODE_ECP))
1065 w_ecr(ppb_hi, 0x80);
1067 /* Done configuration */
1069 err = ppa_init(dev);
1070 ppa_pb_release(dev);
1072 if (err)
1073 goto out1;
1075 /* now the glue ... */
1076 if (dev->mode == PPA_NIBBLE || dev->mode == PPA_PS2)
1077 ports = 3;
1078 else
1079 ports = 8;
1081 INIT_DELAYED_WORK(&dev->ppa_tq, ppa_interrupt);
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;
1099 out2:
1100 list_del_init(&dev->list);
1101 scsi_host_put(host);
1102 out1:
1103 parport_unregister_device(dev->dev);
1104 out:
1105 kfree(dev);
1106 return err;
1109 static void ppa_attach(struct parport *pb)
1111 __ppa_attach(pb);
1114 static void ppa_detach(struct parport *pb)
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;
1129 static struct parport_driver ppa_driver = {
1130 .name = "ppa",
1131 .attach = ppa_attach,
1132 .detach = ppa_detach,
1135 static int __init ppa_driver_init(void)
1137 printk(KERN_INFO "ppa: Version %s\n", PPA_VERSION);
1138 return parport_register_driver(&ppa_driver);
1141 static void __exit ppa_driver_exit(void)
1143 parport_unregister_driver(&ppa_driver);
1146 module_init(ppa_driver_init);
1147 module_exit(ppa_driver_exit);
1148 MODULE_LICENSE("GPL");