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1da177e4 LT |
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 | * Current Maintainer: David Campbell (Perth, Western Australia, GMT+0800) | |
10 | * campbell@torque.net | |
11 | */ | |
12 | ||
13 | #include <linux/config.h> | |
14 | #include <linux/init.h> | |
15 | #include <linux/kernel.h> | |
16 | #include <linux/module.h> | |
17 | #include <linux/blkdev.h> | |
18 | #include <linux/parport.h> | |
19 | #include <linux/workqueue.h> | |
68b3aa7c | 20 | #include <linux/delay.h> |
60c904ae | 21 | #include <linux/jiffies.h> |
1da177e4 LT |
22 | #include <asm/io.h> |
23 | ||
24 | #include <scsi/scsi.h> | |
25 | #include <scsi/scsi_cmnd.h> | |
26 | #include <scsi/scsi_device.h> | |
27 | #include <scsi/scsi_host.h> | |
28 | ||
29 | ||
30 | static void ppa_reset_pulse(unsigned int base); | |
31 | ||
32 | typedef struct { | |
33 | struct pardevice *dev; /* Parport device entry */ | |
34 | int base; /* Actual port address */ | |
35 | int mode; /* Transfer mode */ | |
36 | struct scsi_cmnd *cur_cmd; /* Current queued command */ | |
37 | struct work_struct ppa_tq; /* Polling interrupt stuff */ | |
38 | unsigned long jstart; /* Jiffies at start */ | |
39 | unsigned long recon_tmo; /* How many usecs to wait for reconnection (6th bit) */ | |
40 | unsigned int failed:1; /* Failure flag */ | |
41 | unsigned wanted:1; /* Parport sharing busy flag */ | |
42 | wait_queue_head_t *waiting; | |
43 | struct Scsi_Host *host; | |
44 | struct list_head list; | |
45 | } ppa_struct; | |
46 | ||
47 | #include "ppa.h" | |
48 | ||
49 | static inline ppa_struct *ppa_dev(struct Scsi_Host *host) | |
50 | { | |
51 | return *(ppa_struct **)&host->hostdata; | |
52 | } | |
53 | ||
54 | static DEFINE_SPINLOCK(arbitration_lock); | |
55 | ||
56 | static void got_it(ppa_struct *dev) | |
57 | { | |
58 | dev->base = dev->dev->port->base; | |
59 | if (dev->cur_cmd) | |
60 | dev->cur_cmd->SCp.phase = 1; | |
61 | else | |
62 | wake_up(dev->waiting); | |
63 | } | |
64 | ||
65 | static void ppa_wakeup(void *ref) | |
66 | { | |
67 | ppa_struct *dev = (ppa_struct *) ref; | |
68 | unsigned long flags; | |
69 | ||
70 | spin_lock_irqsave(&arbitration_lock, flags); | |
71 | if (dev->wanted) { | |
72 | parport_claim(dev->dev); | |
73 | got_it(dev); | |
74 | dev->wanted = 0; | |
75 | } | |
76 | spin_unlock_irqrestore(&arbitration_lock, flags); | |
77 | return; | |
78 | } | |
79 | ||
80 | static int ppa_pb_claim(ppa_struct *dev) | |
81 | { | |
82 | unsigned long flags; | |
83 | int res = 1; | |
84 | spin_lock_irqsave(&arbitration_lock, flags); | |
85 | if (parport_claim(dev->dev) == 0) { | |
86 | got_it(dev); | |
87 | res = 0; | |
88 | } | |
89 | dev->wanted = res; | |
90 | spin_unlock_irqrestore(&arbitration_lock, flags); | |
91 | return res; | |
92 | } | |
93 | ||
94 | static void ppa_pb_dismiss(ppa_struct *dev) | |
95 | { | |
96 | unsigned long flags; | |
97 | int wanted; | |
98 | spin_lock_irqsave(&arbitration_lock, flags); | |
99 | wanted = dev->wanted; | |
100 | dev->wanted = 0; | |
101 | spin_unlock_irqrestore(&arbitration_lock, flags); | |
102 | if (!wanted) | |
103 | parport_release(dev->dev); | |
104 | } | |
105 | ||
106 | static inline void ppa_pb_release(ppa_struct *dev) | |
107 | { | |
108 | parport_release(dev->dev); | |
109 | } | |
110 | ||
111 | /* | |
112 | * Start of Chipset kludges | |
113 | */ | |
114 | ||
115 | /* This is to give the ppa driver a way to modify the timings (and other | |
116 | * parameters) by writing to the /proc/scsi/ppa/0 file. | |
117 | * Very simple method really... (To simple, no error checking :( ) | |
118 | * Reason: Kernel hackers HATE having to unload and reload modules for | |
119 | * testing... | |
120 | * Also gives a method to use a script to obtain optimum timings (TODO) | |
121 | */ | |
122 | ||
123 | static inline int ppa_proc_write(ppa_struct *dev, char *buffer, int length) | |
124 | { | |
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("ppa: recon_tmo set to %ld\n", x); | |
136 | return length; | |
137 | } | |
138 | printk("ppa /proc: invalid variable\n"); | |
139 | return (-EINVAL); | |
140 | } | |
141 | ||
142 | static int ppa_proc_info(struct Scsi_Host *host, char *buffer, char **start, off_t offset, int length, int inout) | |
143 | { | |
144 | int len = 0; | |
145 | ppa_struct *dev = ppa_dev(host); | |
146 | ||
147 | if (inout) | |
148 | return ppa_proc_write(dev, buffer, length); | |
149 | ||
150 | len += sprintf(buffer + len, "Version : %s\n", PPA_VERSION); | |
151 | len += | |
152 | sprintf(buffer + len, "Parport : %s\n", | |
153 | dev->dev->port->name); | |
154 | len += | |
155 | sprintf(buffer + len, "Mode : %s\n", | |
156 | PPA_MODE_STRING[dev->mode]); | |
157 | #if PPA_DEBUG > 0 | |
158 | len += | |
159 | sprintf(buffer + len, "recon_tmo : %lu\n", dev->recon_tmo); | |
160 | #endif | |
161 | ||
162 | /* Request for beyond end of buffer */ | |
163 | if (offset > length) | |
164 | return 0; | |
165 | ||
166 | *start = buffer + offset; | |
167 | len -= offset; | |
168 | if (len > length) | |
169 | len = length; | |
170 | return len; | |
171 | } | |
172 | ||
173 | static int device_check(ppa_struct *dev); | |
174 | ||
175 | #if PPA_DEBUG > 0 | |
176 | #define ppa_fail(x,y) printk("ppa: ppa_fail(%i) from %s at line %d\n",\ | |
177 | y, __FUNCTION__, __LINE__); ppa_fail_func(x,y); | |
178 | static inline void ppa_fail_func(ppa_struct *dev, int error_code) | |
179 | #else | |
180 | static inline void ppa_fail(ppa_struct *dev, int error_code) | |
181 | #endif | |
182 | { | |
183 | /* If we fail a device then we trash status / message bytes */ | |
184 | if (dev->cur_cmd) { | |
185 | dev->cur_cmd->result = error_code << 16; | |
186 | dev->failed = 1; | |
187 | } | |
188 | } | |
189 | ||
190 | /* | |
191 | * Wait for the high bit to be set. | |
192 | * | |
193 | * In principle, this could be tied to an interrupt, but the adapter | |
194 | * doesn't appear to be designed to support interrupts. We spin on | |
195 | * the 0x80 ready bit. | |
196 | */ | |
197 | static unsigned char ppa_wait(ppa_struct *dev) | |
198 | { | |
199 | int k; | |
200 | unsigned short ppb = dev->base; | |
201 | unsigned char r; | |
202 | ||
203 | k = PPA_SPIN_TMO; | |
204 | /* Wait for bit 6 and 7 - PJC */ | |
205 | for (r = r_str(ppb); ((r & 0xc0) != 0xc0) && (k); k--) { | |
206 | udelay(1); | |
207 | r = r_str(ppb); | |
208 | } | |
209 | ||
210 | /* | |
211 | * return some status information. | |
212 | * Semantics: 0xc0 = ZIP wants more data | |
213 | * 0xd0 = ZIP wants to send more data | |
214 | * 0xe0 = ZIP is expecting SCSI command data | |
215 | * 0xf0 = end of transfer, ZIP is sending status | |
216 | */ | |
217 | if (k) | |
218 | return (r & 0xf0); | |
219 | ||
220 | /* Counter expired - Time out occurred */ | |
221 | ppa_fail(dev, DID_TIME_OUT); | |
222 | printk("ppa timeout in ppa_wait\n"); | |
223 | return 0; /* command timed out */ | |
224 | } | |
225 | ||
226 | /* | |
227 | * Clear EPP Timeout Bit | |
228 | */ | |
229 | static inline void epp_reset(unsigned short ppb) | |
230 | { | |
231 | int i; | |
232 | ||
233 | i = r_str(ppb); | |
234 | w_str(ppb, i); | |
235 | w_str(ppb, i & 0xfe); | |
236 | } | |
237 | ||
238 | /* | |
239 | * Wait for empty ECP fifo (if we are in ECP fifo mode only) | |
240 | */ | |
241 | static inline void ecp_sync(ppa_struct *dev) | |
242 | { | |
243 | int i, ppb_hi = dev->dev->port->base_hi; | |
244 | ||
245 | if (ppb_hi == 0) | |
246 | return; | |
247 | ||
248 | if ((r_ecr(ppb_hi) & 0xe0) == 0x60) { /* mode 011 == ECP fifo mode */ | |
249 | for (i = 0; i < 100; i++) { | |
250 | if (r_ecr(ppb_hi) & 0x01) | |
251 | return; | |
252 | udelay(5); | |
253 | } | |
254 | printk("ppa: ECP sync failed as data still present in FIFO.\n"); | |
255 | } | |
256 | } | |
257 | ||
258 | static int ppa_byte_out(unsigned short base, const char *buffer, int len) | |
259 | { | |
260 | int i; | |
261 | ||
262 | for (i = len; i; i--) { | |
263 | w_dtr(base, *buffer++); | |
264 | w_ctr(base, 0xe); | |
265 | w_ctr(base, 0xc); | |
266 | } | |
267 | return 1; /* All went well - we hope! */ | |
268 | } | |
269 | ||
270 | static int ppa_byte_in(unsigned short base, char *buffer, int len) | |
271 | { | |
272 | int i; | |
273 | ||
274 | for (i = len; i; i--) { | |
275 | *buffer++ = r_dtr(base); | |
276 | w_ctr(base, 0x27); | |
277 | w_ctr(base, 0x25); | |
278 | } | |
279 | return 1; /* All went well - we hope! */ | |
280 | } | |
281 | ||
282 | static int ppa_nibble_in(unsigned short base, char *buffer, int len) | |
283 | { | |
284 | for (; len; len--) { | |
285 | unsigned char h; | |
286 | ||
287 | w_ctr(base, 0x4); | |
288 | h = r_str(base) & 0xf0; | |
289 | w_ctr(base, 0x6); | |
290 | *buffer++ = h | ((r_str(base) & 0xf0) >> 4); | |
291 | } | |
292 | return 1; /* All went well - we hope! */ | |
293 | } | |
294 | ||
295 | static int ppa_out(ppa_struct *dev, char *buffer, int len) | |
296 | { | |
297 | int r; | |
298 | unsigned short ppb = dev->base; | |
299 | ||
300 | r = ppa_wait(dev); | |
301 | ||
302 | if ((r & 0x50) != 0x40) { | |
303 | ppa_fail(dev, DID_ERROR); | |
304 | return 0; | |
305 | } | |
306 | switch (dev->mode) { | |
307 | case PPA_NIBBLE: | |
308 | case PPA_PS2: | |
309 | /* 8 bit output, with a loop */ | |
310 | r = ppa_byte_out(ppb, buffer, len); | |
311 | break; | |
312 | ||
313 | case PPA_EPP_32: | |
314 | case PPA_EPP_16: | |
315 | case PPA_EPP_8: | |
316 | epp_reset(ppb); | |
317 | w_ctr(ppb, 0x4); | |
318 | #ifdef CONFIG_SCSI_IZIP_EPP16 | |
319 | if (!(((long) buffer | len) & 0x01)) | |
320 | outsw(ppb + 4, buffer, len >> 1); | |
321 | #else | |
322 | if (!(((long) buffer | len) & 0x03)) | |
323 | outsl(ppb + 4, buffer, len >> 2); | |
324 | #endif | |
325 | else | |
326 | outsb(ppb + 4, buffer, len); | |
327 | w_ctr(ppb, 0xc); | |
328 | r = !(r_str(ppb) & 0x01); | |
329 | w_ctr(ppb, 0xc); | |
330 | ecp_sync(dev); | |
331 | break; | |
332 | ||
333 | default: | |
334 | printk("PPA: bug in ppa_out()\n"); | |
335 | r = 0; | |
336 | } | |
337 | return r; | |
338 | } | |
339 | ||
340 | static int ppa_in(ppa_struct *dev, char *buffer, int len) | |
341 | { | |
342 | int r; | |
343 | unsigned short ppb = dev->base; | |
344 | ||
345 | r = ppa_wait(dev); | |
346 | ||
347 | if ((r & 0x50) != 0x50) { | |
348 | ppa_fail(dev, DID_ERROR); | |
349 | return 0; | |
350 | } | |
351 | switch (dev->mode) { | |
352 | case PPA_NIBBLE: | |
353 | /* 4 bit input, with a loop */ | |
354 | r = ppa_nibble_in(ppb, buffer, len); | |
355 | w_ctr(ppb, 0xc); | |
356 | break; | |
357 | ||
358 | case PPA_PS2: | |
359 | /* 8 bit input, with a loop */ | |
360 | w_ctr(ppb, 0x25); | |
361 | r = ppa_byte_in(ppb, buffer, len); | |
362 | w_ctr(ppb, 0x4); | |
363 | w_ctr(ppb, 0xc); | |
364 | break; | |
365 | ||
366 | case PPA_EPP_32: | |
367 | case PPA_EPP_16: | |
368 | case PPA_EPP_8: | |
369 | epp_reset(ppb); | |
370 | w_ctr(ppb, 0x24); | |
371 | #ifdef CONFIG_SCSI_IZIP_EPP16 | |
372 | if (!(((long) buffer | len) & 0x01)) | |
373 | insw(ppb + 4, buffer, len >> 1); | |
374 | #else | |
375 | if (!(((long) buffer | len) & 0x03)) | |
376 | insl(ppb + 4, buffer, len >> 2); | |
377 | #endif | |
378 | else | |
379 | insb(ppb + 4, buffer, len); | |
380 | w_ctr(ppb, 0x2c); | |
381 | r = !(r_str(ppb) & 0x01); | |
382 | w_ctr(ppb, 0x2c); | |
383 | ecp_sync(dev); | |
384 | break; | |
385 | ||
386 | default: | |
387 | printk("PPA: bug in ppa_ins()\n"); | |
388 | r = 0; | |
389 | break; | |
390 | } | |
391 | return r; | |
392 | } | |
393 | ||
394 | /* end of ppa_io.h */ | |
395 | static inline void ppa_d_pulse(unsigned short ppb, unsigned char b) | |
396 | { | |
397 | w_dtr(ppb, b); | |
398 | w_ctr(ppb, 0xc); | |
399 | w_ctr(ppb, 0xe); | |
400 | w_ctr(ppb, 0xc); | |
401 | w_ctr(ppb, 0x4); | |
402 | w_ctr(ppb, 0xc); | |
403 | } | |
404 | ||
405 | static void ppa_disconnect(ppa_struct *dev) | |
406 | { | |
407 | unsigned short ppb = dev->base; | |
408 | ||
409 | ppa_d_pulse(ppb, 0); | |
410 | ppa_d_pulse(ppb, 0x3c); | |
411 | ppa_d_pulse(ppb, 0x20); | |
412 | ppa_d_pulse(ppb, 0xf); | |
413 | } | |
414 | ||
415 | static inline void ppa_c_pulse(unsigned short ppb, unsigned char b) | |
416 | { | |
417 | w_dtr(ppb, b); | |
418 | w_ctr(ppb, 0x4); | |
419 | w_ctr(ppb, 0x6); | |
420 | w_ctr(ppb, 0x4); | |
421 | w_ctr(ppb, 0xc); | |
422 | } | |
423 | ||
424 | static inline void ppa_connect(ppa_struct *dev, int flag) | |
425 | { | |
426 | unsigned short ppb = dev->base; | |
427 | ||
428 | ppa_c_pulse(ppb, 0); | |
429 | ppa_c_pulse(ppb, 0x3c); | |
430 | ppa_c_pulse(ppb, 0x20); | |
431 | if ((flag == CONNECT_EPP_MAYBE) && IN_EPP_MODE(dev->mode)) | |
432 | ppa_c_pulse(ppb, 0xcf); | |
433 | else | |
434 | ppa_c_pulse(ppb, 0x8f); | |
435 | } | |
436 | ||
437 | static int ppa_select(ppa_struct *dev, int target) | |
438 | { | |
439 | int k; | |
440 | unsigned short ppb = dev->base; | |
441 | ||
442 | /* | |
443 | * Bit 6 (0x40) is the device selected bit. | |
444 | * First we must wait till the current device goes off line... | |
445 | */ | |
446 | k = PPA_SELECT_TMO; | |
447 | do { | |
448 | k--; | |
449 | udelay(1); | |
450 | } while ((r_str(ppb) & 0x40) && (k)); | |
451 | if (!k) | |
452 | return 0; | |
453 | ||
454 | w_dtr(ppb, (1 << target)); | |
455 | w_ctr(ppb, 0xe); | |
456 | w_ctr(ppb, 0xc); | |
457 | w_dtr(ppb, 0x80); /* This is NOT the initator */ | |
458 | w_ctr(ppb, 0x8); | |
459 | ||
460 | k = PPA_SELECT_TMO; | |
461 | do { | |
462 | k--; | |
463 | udelay(1); | |
464 | } | |
465 | while (!(r_str(ppb) & 0x40) && (k)); | |
466 | if (!k) | |
467 | return 0; | |
468 | ||
469 | return 1; | |
470 | } | |
471 | ||
472 | /* | |
473 | * This is based on a trace of what the Iomega DOS 'guest' driver does. | |
474 | * I've tried several different kinds of parallel ports with guest and | |
475 | * coded this to react in the same ways that it does. | |
476 | * | |
477 | * The return value from this function is just a hint about where the | |
478 | * handshaking failed. | |
479 | * | |
480 | */ | |
481 | static int ppa_init(ppa_struct *dev) | |
482 | { | |
483 | int retv; | |
484 | unsigned short ppb = dev->base; | |
485 | ||
486 | ppa_disconnect(dev); | |
487 | ppa_connect(dev, CONNECT_NORMAL); | |
488 | ||
489 | retv = 2; /* Failed */ | |
490 | ||
491 | w_ctr(ppb, 0xe); | |
492 | if ((r_str(ppb) & 0x08) == 0x08) | |
493 | retv--; | |
494 | ||
495 | w_ctr(ppb, 0xc); | |
496 | if ((r_str(ppb) & 0x08) == 0x00) | |
497 | retv--; | |
498 | ||
499 | if (!retv) | |
500 | ppa_reset_pulse(ppb); | |
501 | udelay(1000); /* Allow devices to settle down */ | |
502 | ppa_disconnect(dev); | |
503 | udelay(1000); /* Another delay to allow devices to settle */ | |
504 | ||
505 | if (retv) | |
506 | return -EIO; | |
507 | ||
508 | return device_check(dev); | |
509 | } | |
510 | ||
511 | static inline int ppa_send_command(struct scsi_cmnd *cmd) | |
512 | { | |
513 | ppa_struct *dev = ppa_dev(cmd->device->host); | |
514 | int k; | |
515 | ||
516 | w_ctr(dev->base, 0x0c); | |
517 | ||
518 | for (k = 0; k < cmd->cmd_len; k++) | |
519 | if (!ppa_out(dev, &cmd->cmnd[k], 1)) | |
520 | return 0; | |
521 | return 1; | |
522 | } | |
523 | ||
524 | /* | |
525 | * The bulk flag enables some optimisations in the data transfer loops, | |
526 | * it should be true for any command that transfers data in integral | |
527 | * numbers of sectors. | |
528 | * | |
529 | * The driver appears to remain stable if we speed up the parallel port | |
530 | * i/o in this function, but not elsewhere. | |
531 | */ | |
532 | static int ppa_completion(struct scsi_cmnd *cmd) | |
533 | { | |
534 | /* Return codes: | |
535 | * -1 Error | |
536 | * 0 Told to schedule | |
537 | * 1 Finished data transfer | |
538 | */ | |
539 | ppa_struct *dev = ppa_dev(cmd->device->host); | |
540 | unsigned short ppb = dev->base; | |
541 | unsigned long start_jiffies = jiffies; | |
542 | ||
543 | unsigned char r, v; | |
544 | int fast, bulk, status; | |
545 | ||
546 | v = cmd->cmnd[0]; | |
547 | bulk = ((v == READ_6) || | |
548 | (v == READ_10) || (v == WRITE_6) || (v == WRITE_10)); | |
549 | ||
550 | /* | |
551 | * We only get here if the drive is ready to comunicate, | |
552 | * hence no need for a full ppa_wait. | |
553 | */ | |
554 | r = (r_str(ppb) & 0xf0); | |
555 | ||
556 | while (r != (unsigned char) 0xf0) { | |
557 | /* | |
558 | * If we have been running for more than a full timer tick | |
559 | * then take a rest. | |
560 | */ | |
561 | if (time_after(jiffies, start_jiffies + 1)) | |
562 | return 0; | |
563 | ||
564 | if ((cmd->SCp.this_residual <= 0)) { | |
565 | ppa_fail(dev, DID_ERROR); | |
566 | return -1; /* ERROR_RETURN */ | |
567 | } | |
568 | ||
569 | /* On some hardware we have SCSI disconnected (6th bit low) | |
570 | * for about 100usecs. It is too expensive to wait a | |
571 | * tick on every loop so we busy wait for no more than | |
572 | * 500usecs to give the drive a chance first. We do not | |
573 | * change things for "normal" hardware since generally | |
574 | * the 6th bit is always high. | |
575 | * This makes the CPU load higher on some hardware | |
576 | * but otherwise we can not get more than 50K/secs | |
577 | * on this problem hardware. | |
578 | */ | |
579 | if ((r & 0xc0) != 0xc0) { | |
580 | /* Wait for reconnection should be no more than | |
581 | * jiffy/2 = 5ms = 5000 loops | |
582 | */ | |
583 | unsigned long k = dev->recon_tmo; | |
584 | for (; k && ((r = (r_str(ppb) & 0xf0)) & 0xc0) != 0xc0; | |
585 | k--) | |
586 | udelay(1); | |
587 | ||
588 | if (!k) | |
589 | return 0; | |
590 | } | |
591 | ||
592 | /* determine if we should use burst I/O */ | |
593 | fast = (bulk && (cmd->SCp.this_residual >= PPA_BURST_SIZE)) | |
594 | ? PPA_BURST_SIZE : 1; | |
595 | ||
596 | if (r == (unsigned char) 0xc0) | |
597 | status = ppa_out(dev, cmd->SCp.ptr, fast); | |
598 | else | |
599 | status = ppa_in(dev, cmd->SCp.ptr, fast); | |
600 | ||
601 | cmd->SCp.ptr += fast; | |
602 | cmd->SCp.this_residual -= fast; | |
603 | ||
604 | if (!status) { | |
605 | ppa_fail(dev, DID_BUS_BUSY); | |
606 | return -1; /* ERROR_RETURN */ | |
607 | } | |
608 | if (cmd->SCp.buffer && !cmd->SCp.this_residual) { | |
609 | /* if scatter/gather, advance to the next segment */ | |
610 | if (cmd->SCp.buffers_residual--) { | |
611 | cmd->SCp.buffer++; | |
612 | cmd->SCp.this_residual = | |
613 | cmd->SCp.buffer->length; | |
614 | cmd->SCp.ptr = | |
615 | page_address(cmd->SCp.buffer->page) + | |
616 | cmd->SCp.buffer->offset; | |
617 | } | |
618 | } | |
619 | /* Now check to see if the drive is ready to comunicate */ | |
620 | r = (r_str(ppb) & 0xf0); | |
621 | /* If not, drop back down to the scheduler and wait a timer tick */ | |
622 | if (!(r & 0x80)) | |
623 | return 0; | |
624 | } | |
625 | return 1; /* FINISH_RETURN */ | |
626 | } | |
627 | ||
628 | /* | |
629 | * Since the PPA itself doesn't generate interrupts, we use | |
630 | * the scheduler's task queue to generate a stream of call-backs and | |
631 | * complete the request when the drive is ready. | |
632 | */ | |
633 | static void ppa_interrupt(void *data) | |
634 | { | |
635 | ppa_struct *dev = (ppa_struct *) data; | |
636 | struct scsi_cmnd *cmd = dev->cur_cmd; | |
637 | ||
638 | if (!cmd) { | |
639 | printk("PPA: bug in ppa_interrupt\n"); | |
640 | return; | |
641 | } | |
642 | if (ppa_engine(dev, cmd)) { | |
643 | dev->ppa_tq.data = (void *) dev; | |
644 | schedule_delayed_work(&dev->ppa_tq, 1); | |
645 | return; | |
646 | } | |
647 | /* Command must of completed hence it is safe to let go... */ | |
648 | #if PPA_DEBUG > 0 | |
649 | switch ((cmd->result >> 16) & 0xff) { | |
650 | case DID_OK: | |
651 | break; | |
652 | case DID_NO_CONNECT: | |
653 | printk("ppa: no device at SCSI ID %i\n", cmd->device->target); | |
654 | break; | |
655 | case DID_BUS_BUSY: | |
656 | printk("ppa: BUS BUSY - EPP timeout detected\n"); | |
657 | break; | |
658 | case DID_TIME_OUT: | |
659 | printk("ppa: unknown timeout\n"); | |
660 | break; | |
661 | case DID_ABORT: | |
662 | printk("ppa: told to abort\n"); | |
663 | break; | |
664 | case DID_PARITY: | |
665 | printk("ppa: parity error (???)\n"); | |
666 | break; | |
667 | case DID_ERROR: | |
668 | printk("ppa: internal driver error\n"); | |
669 | break; | |
670 | case DID_RESET: | |
671 | printk("ppa: told to reset device\n"); | |
672 | break; | |
673 | case DID_BAD_INTR: | |
674 | printk("ppa: bad interrupt (???)\n"); | |
675 | break; | |
676 | default: | |
677 | printk("ppa: bad return code (%02x)\n", | |
678 | (cmd->result >> 16) & 0xff); | |
679 | } | |
680 | #endif | |
681 | ||
682 | if (cmd->SCp.phase > 1) | |
683 | ppa_disconnect(dev); | |
684 | ||
685 | ppa_pb_dismiss(dev); | |
686 | ||
687 | dev->cur_cmd = NULL; | |
688 | ||
689 | cmd->scsi_done(cmd); | |
690 | } | |
691 | ||
692 | static int ppa_engine(ppa_struct *dev, struct scsi_cmnd *cmd) | |
693 | { | |
694 | unsigned short ppb = dev->base; | |
695 | unsigned char l = 0, h = 0; | |
696 | int retv; | |
697 | ||
698 | /* First check for any errors that may of occurred | |
699 | * Here we check for internal errors | |
700 | */ | |
701 | if (dev->failed) | |
702 | return 0; | |
703 | ||
704 | switch (cmd->SCp.phase) { | |
705 | case 0: /* Phase 0 - Waiting for parport */ | |
706 | if (time_after(jiffies, dev->jstart + HZ)) { | |
707 | /* | |
708 | * We waited more than a second | |
709 | * for parport to call us | |
710 | */ | |
711 | ppa_fail(dev, DID_BUS_BUSY); | |
712 | return 0; | |
713 | } | |
714 | return 1; /* wait until ppa_wakeup claims parport */ | |
715 | case 1: /* Phase 1 - Connected */ | |
716 | { /* Perform a sanity check for cable unplugged */ | |
717 | int retv = 2; /* Failed */ | |
718 | ||
719 | ppa_connect(dev, CONNECT_EPP_MAYBE); | |
720 | ||
721 | w_ctr(ppb, 0xe); | |
722 | if ((r_str(ppb) & 0x08) == 0x08) | |
723 | retv--; | |
724 | ||
725 | w_ctr(ppb, 0xc); | |
726 | if ((r_str(ppb) & 0x08) == 0x00) | |
727 | retv--; | |
728 | ||
729 | if (retv) { | |
60c904ae | 730 | if (time_after(jiffies, dev->jstart + (1 * HZ))) { |
1da177e4 LT |
731 | printk |
732 | ("ppa: Parallel port cable is unplugged!!\n"); | |
733 | ppa_fail(dev, DID_BUS_BUSY); | |
734 | return 0; | |
735 | } else { | |
736 | ppa_disconnect(dev); | |
737 | return 1; /* Try again in a jiffy */ | |
738 | } | |
739 | } | |
740 | cmd->SCp.phase++; | |
741 | } | |
742 | ||
743 | case 2: /* Phase 2 - We are now talking to the scsi bus */ | |
422c0d61 | 744 | if (!ppa_select(dev, scmd_id(cmd))) { |
1da177e4 LT |
745 | ppa_fail(dev, DID_NO_CONNECT); |
746 | return 0; | |
747 | } | |
748 | cmd->SCp.phase++; | |
749 | ||
750 | case 3: /* Phase 3 - Ready to accept a command */ | |
751 | w_ctr(ppb, 0x0c); | |
752 | if (!(r_str(ppb) & 0x80)) | |
753 | return 1; | |
754 | ||
755 | if (!ppa_send_command(cmd)) | |
756 | return 0; | |
757 | cmd->SCp.phase++; | |
758 | ||
759 | case 4: /* Phase 4 - Setup scatter/gather buffers */ | |
760 | if (cmd->use_sg) { | |
761 | /* if many buffers are available, start filling the first */ | |
762 | cmd->SCp.buffer = | |
763 | (struct scatterlist *) cmd->request_buffer; | |
764 | cmd->SCp.this_residual = cmd->SCp.buffer->length; | |
765 | cmd->SCp.ptr = | |
766 | page_address(cmd->SCp.buffer->page) + | |
767 | cmd->SCp.buffer->offset; | |
768 | } else { | |
769 | /* else fill the only available buffer */ | |
770 | cmd->SCp.buffer = NULL; | |
771 | cmd->SCp.this_residual = cmd->request_bufflen; | |
772 | cmd->SCp.ptr = cmd->request_buffer; | |
773 | } | |
774 | cmd->SCp.buffers_residual = cmd->use_sg - 1; | |
775 | cmd->SCp.phase++; | |
776 | ||
777 | case 5: /* Phase 5 - Data transfer stage */ | |
778 | w_ctr(ppb, 0x0c); | |
779 | if (!(r_str(ppb) & 0x80)) | |
780 | return 1; | |
781 | ||
782 | retv = ppa_completion(cmd); | |
783 | if (retv == -1) | |
784 | return 0; | |
785 | if (retv == 0) | |
786 | return 1; | |
787 | cmd->SCp.phase++; | |
788 | ||
789 | case 6: /* Phase 6 - Read status/message */ | |
790 | cmd->result = DID_OK << 16; | |
791 | /* Check for data overrun */ | |
792 | if (ppa_wait(dev) != (unsigned char) 0xf0) { | |
793 | ppa_fail(dev, DID_ERROR); | |
794 | return 0; | |
795 | } | |
796 | if (ppa_in(dev, &l, 1)) { /* read status byte */ | |
797 | /* Check for optional message byte */ | |
798 | if (ppa_wait(dev) == (unsigned char) 0xf0) | |
799 | ppa_in(dev, &h, 1); | |
800 | cmd->result = | |
801 | (DID_OK << 16) + (h << 8) + (l & STATUS_MASK); | |
802 | } | |
803 | return 0; /* Finished */ | |
804 | break; | |
805 | ||
806 | default: | |
807 | printk("ppa: Invalid scsi phase\n"); | |
808 | } | |
809 | return 0; | |
810 | } | |
811 | ||
812 | static int ppa_queuecommand(struct scsi_cmnd *cmd, | |
813 | void (*done) (struct scsi_cmnd *)) | |
814 | { | |
815 | ppa_struct *dev = ppa_dev(cmd->device->host); | |
816 | ||
817 | if (dev->cur_cmd) { | |
818 | printk("PPA: bug in ppa_queuecommand\n"); | |
819 | return 0; | |
820 | } | |
821 | dev->failed = 0; | |
822 | dev->jstart = jiffies; | |
823 | dev->cur_cmd = cmd; | |
824 | cmd->scsi_done = done; | |
825 | cmd->result = DID_ERROR << 16; /* default return code */ | |
826 | cmd->SCp.phase = 0; /* bus free */ | |
827 | ||
828 | dev->ppa_tq.data = dev; | |
829 | schedule_work(&dev->ppa_tq); | |
830 | ||
831 | ppa_pb_claim(dev); | |
832 | ||
833 | return 0; | |
834 | } | |
835 | ||
836 | /* | |
837 | * Apparently the disk->capacity attribute is off by 1 sector | |
838 | * for all disk drives. We add the one here, but it should really | |
839 | * be done in sd.c. Even if it gets fixed there, this will still | |
840 | * work. | |
841 | */ | |
842 | static int ppa_biosparam(struct scsi_device *sdev, struct block_device *dev, | |
843 | sector_t capacity, int ip[]) | |
844 | { | |
845 | ip[0] = 0x40; | |
846 | ip[1] = 0x20; | |
847 | ip[2] = ((unsigned long) capacity + 1) / (ip[0] * ip[1]); | |
848 | if (ip[2] > 1024) { | |
849 | ip[0] = 0xff; | |
850 | ip[1] = 0x3f; | |
851 | ip[2] = ((unsigned long) capacity + 1) / (ip[0] * ip[1]); | |
852 | if (ip[2] > 1023) | |
853 | ip[2] = 1023; | |
854 | } | |
855 | return 0; | |
856 | } | |
857 | ||
858 | static int ppa_abort(struct scsi_cmnd *cmd) | |
859 | { | |
860 | ppa_struct *dev = ppa_dev(cmd->device->host); | |
861 | /* | |
862 | * There is no method for aborting commands since Iomega | |
863 | * have tied the SCSI_MESSAGE line high in the interface | |
864 | */ | |
865 | ||
866 | switch (cmd->SCp.phase) { | |
867 | case 0: /* Do not have access to parport */ | |
868 | case 1: /* Have not connected to interface */ | |
869 | dev->cur_cmd = NULL; /* Forget the problem */ | |
870 | return SUCCESS; | |
871 | break; | |
872 | default: /* SCSI command sent, can not abort */ | |
873 | return FAILED; | |
874 | break; | |
875 | } | |
876 | } | |
877 | ||
878 | static void ppa_reset_pulse(unsigned int base) | |
879 | { | |
880 | w_dtr(base, 0x40); | |
881 | w_ctr(base, 0x8); | |
882 | udelay(30); | |
883 | w_ctr(base, 0xc); | |
884 | } | |
885 | ||
886 | static int ppa_reset(struct scsi_cmnd *cmd) | |
887 | { | |
888 | ppa_struct *dev = ppa_dev(cmd->device->host); | |
889 | ||
890 | if (cmd->SCp.phase) | |
891 | ppa_disconnect(dev); | |
892 | dev->cur_cmd = NULL; /* Forget the problem */ | |
893 | ||
894 | ppa_connect(dev, CONNECT_NORMAL); | |
895 | ppa_reset_pulse(dev->base); | |
68b3aa7c | 896 | mdelay(1); /* device settle delay */ |
1da177e4 | 897 | ppa_disconnect(dev); |
68b3aa7c | 898 | mdelay(1); /* device settle delay */ |
1da177e4 LT |
899 | return SUCCESS; |
900 | } | |
901 | ||
902 | static int device_check(ppa_struct *dev) | |
903 | { | |
904 | /* This routine looks for a device and then attempts to use EPP | |
905 | to send a command. If all goes as planned then EPP is available. */ | |
906 | ||
907 | static char cmd[6] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }; | |
908 | int loop, old_mode, status, k, ppb = dev->base; | |
909 | unsigned char l; | |
910 | ||
911 | old_mode = dev->mode; | |
912 | for (loop = 0; loop < 8; loop++) { | |
913 | /* Attempt to use EPP for Test Unit Ready */ | |
914 | if ((ppb & 0x0007) == 0x0000) | |
915 | dev->mode = PPA_EPP_32; | |
916 | ||
917 | second_pass: | |
918 | ppa_connect(dev, CONNECT_EPP_MAYBE); | |
919 | /* Select SCSI device */ | |
920 | if (!ppa_select(dev, loop)) { | |
921 | ppa_disconnect(dev); | |
922 | continue; | |
923 | } | |
924 | printk("ppa: Found device at ID %i, Attempting to use %s\n", | |
925 | loop, PPA_MODE_STRING[dev->mode]); | |
926 | ||
927 | /* Send SCSI command */ | |
928 | status = 1; | |
929 | w_ctr(ppb, 0x0c); | |
930 | for (l = 0; (l < 6) && (status); l++) | |
931 | status = ppa_out(dev, cmd, 1); | |
932 | ||
933 | if (!status) { | |
934 | ppa_disconnect(dev); | |
935 | ppa_connect(dev, CONNECT_EPP_MAYBE); | |
936 | w_dtr(ppb, 0x40); | |
937 | w_ctr(ppb, 0x08); | |
938 | udelay(30); | |
939 | w_ctr(ppb, 0x0c); | |
940 | udelay(1000); | |
941 | ppa_disconnect(dev); | |
942 | udelay(1000); | |
943 | if (dev->mode == PPA_EPP_32) { | |
944 | dev->mode = old_mode; | |
945 | goto second_pass; | |
946 | } | |
947 | return -EIO; | |
948 | } | |
949 | w_ctr(ppb, 0x0c); | |
950 | k = 1000000; /* 1 Second */ | |
951 | do { | |
952 | l = r_str(ppb); | |
953 | k--; | |
954 | udelay(1); | |
955 | } while (!(l & 0x80) && (k)); | |
956 | ||
957 | l &= 0xf0; | |
958 | ||
959 | if (l != 0xf0) { | |
960 | ppa_disconnect(dev); | |
961 | ppa_connect(dev, CONNECT_EPP_MAYBE); | |
962 | ppa_reset_pulse(ppb); | |
963 | udelay(1000); | |
964 | ppa_disconnect(dev); | |
965 | udelay(1000); | |
966 | if (dev->mode == PPA_EPP_32) { | |
967 | dev->mode = old_mode; | |
968 | goto second_pass; | |
969 | } | |
970 | return -EIO; | |
971 | } | |
972 | ppa_disconnect(dev); | |
973 | printk("ppa: Communication established with ID %i using %s\n", | |
974 | loop, PPA_MODE_STRING[dev->mode]); | |
975 | ppa_connect(dev, CONNECT_EPP_MAYBE); | |
976 | ppa_reset_pulse(ppb); | |
977 | udelay(1000); | |
978 | ppa_disconnect(dev); | |
979 | udelay(1000); | |
980 | return 0; | |
981 | } | |
982 | return -ENODEV; | |
983 | } | |
984 | ||
985 | static struct scsi_host_template ppa_template = { | |
986 | .module = THIS_MODULE, | |
987 | .proc_name = "ppa", | |
988 | .proc_info = ppa_proc_info, | |
989 | .name = "Iomega VPI0 (ppa) interface", | |
990 | .queuecommand = ppa_queuecommand, | |
991 | .eh_abort_handler = ppa_abort, | |
992 | .eh_bus_reset_handler = ppa_reset, | |
993 | .eh_host_reset_handler = ppa_reset, | |
994 | .bios_param = ppa_biosparam, | |
995 | .this_id = -1, | |
996 | .sg_tablesize = SG_ALL, | |
997 | .cmd_per_lun = 1, | |
998 | .use_clustering = ENABLE_CLUSTERING, | |
999 | .can_queue = 1, | |
1000 | }; | |
1001 | ||
1002 | /*************************************************************************** | |
1003 | * Parallel port probing routines * | |
1004 | ***************************************************************************/ | |
1005 | ||
1006 | static LIST_HEAD(ppa_hosts); | |
1007 | ||
1008 | static int __ppa_attach(struct parport *pb) | |
1009 | { | |
1010 | struct Scsi_Host *host; | |
1011 | DECLARE_WAIT_QUEUE_HEAD(waiting); | |
1012 | DEFINE_WAIT(wait); | |
1013 | ppa_struct *dev; | |
1014 | int ports; | |
1015 | int modes, ppb, ppb_hi; | |
1016 | int err = -ENOMEM; | |
1017 | ||
1018 | dev = kmalloc(sizeof(ppa_struct), GFP_KERNEL); | |
1019 | if (!dev) | |
1020 | return -ENOMEM; | |
1021 | memset(dev, 0, sizeof(ppa_struct)); | |
1022 | dev->base = -1; | |
1023 | dev->mode = PPA_AUTODETECT; | |
1024 | dev->recon_tmo = PPA_RECON_TMO; | |
1025 | init_waitqueue_head(&waiting); | |
1026 | dev->dev = parport_register_device(pb, "ppa", NULL, ppa_wakeup, | |
1027 | NULL, 0, dev); | |
1028 | ||
1029 | if (!dev->dev) | |
1030 | goto out; | |
1031 | ||
1032 | /* Claim the bus so it remembers what we do to the control | |
1033 | * registers. [ CTR and ECP ] | |
1034 | */ | |
1035 | err = -EBUSY; | |
1036 | dev->waiting = &waiting; | |
1037 | prepare_to_wait(&waiting, &wait, TASK_UNINTERRUPTIBLE); | |
1038 | if (ppa_pb_claim(dev)) | |
1039 | schedule_timeout(3 * HZ); | |
1040 | if (dev->wanted) { | |
1041 | printk(KERN_ERR "ppa%d: failed to claim parport because " | |
1042 | "a pardevice is owning the port for too long " | |
1043 | "time!\n", pb->number); | |
1044 | ppa_pb_dismiss(dev); | |
1045 | dev->waiting = NULL; | |
1046 | finish_wait(&waiting, &wait); | |
1047 | goto out1; | |
1048 | } | |
1049 | dev->waiting = NULL; | |
1050 | finish_wait(&waiting, &wait); | |
1051 | ppb = dev->base = dev->dev->port->base; | |
1052 | ppb_hi = dev->dev->port->base_hi; | |
1053 | w_ctr(ppb, 0x0c); | |
1054 | modes = dev->dev->port->modes; | |
1055 | ||
1056 | /* Mode detection works up the chain of speed | |
1057 | * This avoids a nasty if-then-else-if-... tree | |
1058 | */ | |
1059 | dev->mode = PPA_NIBBLE; | |
1060 | ||
1061 | if (modes & PARPORT_MODE_TRISTATE) | |
1062 | dev->mode = PPA_PS2; | |
1063 | ||
1064 | if (modes & PARPORT_MODE_ECP) { | |
1065 | w_ecr(ppb_hi, 0x20); | |
1066 | dev->mode = PPA_PS2; | |
1067 | } | |
1068 | if ((modes & PARPORT_MODE_EPP) && (modes & PARPORT_MODE_ECP)) | |
1069 | w_ecr(ppb_hi, 0x80); | |
1070 | ||
1071 | /* Done configuration */ | |
1072 | ||
1073 | err = ppa_init(dev); | |
1074 | ppa_pb_release(dev); | |
1075 | ||
1076 | if (err) | |
1077 | goto out1; | |
1078 | ||
1079 | /* now the glue ... */ | |
1080 | if (dev->mode == PPA_NIBBLE || dev->mode == PPA_PS2) | |
1081 | ports = 3; | |
1082 | else | |
1083 | ports = 8; | |
1084 | ||
1085 | INIT_WORK(&dev->ppa_tq, ppa_interrupt, dev); | |
1086 | ||
1087 | err = -ENOMEM; | |
1088 | host = scsi_host_alloc(&ppa_template, sizeof(ppa_struct *)); | |
1089 | if (!host) | |
1090 | goto out1; | |
1091 | host->io_port = pb->base; | |
1092 | host->n_io_port = ports; | |
1093 | host->dma_channel = -1; | |
1094 | host->unique_id = pb->number; | |
1095 | *(ppa_struct **)&host->hostdata = dev; | |
1096 | dev->host = host; | |
1097 | list_add_tail(&dev->list, &ppa_hosts); | |
1098 | err = scsi_add_host(host, NULL); | |
1099 | if (err) | |
1100 | goto out2; | |
1101 | scsi_scan_host(host); | |
1102 | return 0; | |
1103 | out2: | |
1104 | list_del_init(&dev->list); | |
1105 | scsi_host_put(host); | |
1106 | out1: | |
1107 | parport_unregister_device(dev->dev); | |
1108 | out: | |
1109 | kfree(dev); | |
1110 | return err; | |
1111 | } | |
1112 | ||
1113 | static void ppa_attach(struct parport *pb) | |
1114 | { | |
1115 | __ppa_attach(pb); | |
1116 | } | |
1117 | ||
1118 | static void ppa_detach(struct parport *pb) | |
1119 | { | |
1120 | ppa_struct *dev; | |
1121 | list_for_each_entry(dev, &ppa_hosts, list) { | |
1122 | if (dev->dev->port == pb) { | |
1123 | list_del_init(&dev->list); | |
1124 | scsi_remove_host(dev->host); | |
1125 | scsi_host_put(dev->host); | |
1126 | parport_unregister_device(dev->dev); | |
1127 | kfree(dev); | |
1128 | break; | |
1129 | } | |
1130 | } | |
1131 | } | |
1132 | ||
1133 | static struct parport_driver ppa_driver = { | |
1134 | .name = "ppa", | |
1135 | .attach = ppa_attach, | |
1136 | .detach = ppa_detach, | |
1137 | }; | |
1138 | ||
1139 | static int __init ppa_driver_init(void) | |
1140 | { | |
1141 | printk("ppa: Version %s\n", PPA_VERSION); | |
1142 | return parport_register_driver(&ppa_driver); | |
1143 | } | |
1144 | ||
1145 | static void __exit ppa_driver_exit(void) | |
1146 | { | |
1147 | parport_unregister_driver(&ppa_driver); | |
1148 | } | |
1149 | ||
1150 | module_init(ppa_driver_init); | |
1151 | module_exit(ppa_driver_exit); | |
1152 | MODULE_LICENSE("GPL"); |