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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> |
1da177e4 LT |
21 | #include <asm/io.h> |
22 | ||
23 | #include <scsi/scsi.h> | |
24 | #include <scsi/scsi_cmnd.h> | |
25 | #include <scsi/scsi_device.h> | |
26 | #include <scsi/scsi_host.h> | |
27 | ||
28 | ||
29 | static void ppa_reset_pulse(unsigned int base); | |
30 | ||
31 | typedef struct { | |
32 | struct pardevice *dev; /* Parport device entry */ | |
33 | int base; /* Actual port address */ | |
34 | int mode; /* Transfer mode */ | |
35 | struct scsi_cmnd *cur_cmd; /* Current queued command */ | |
36 | struct work_struct ppa_tq; /* Polling interrupt stuff */ | |
37 | unsigned long jstart; /* Jiffies at start */ | |
38 | unsigned long recon_tmo; /* How many usecs to wait for reconnection (6th bit) */ | |
39 | unsigned int failed:1; /* Failure flag */ | |
40 | unsigned wanted:1; /* Parport sharing busy flag */ | |
41 | wait_queue_head_t *waiting; | |
42 | struct Scsi_Host *host; | |
43 | struct list_head list; | |
44 | } ppa_struct; | |
45 | ||
46 | #include "ppa.h" | |
47 | ||
48 | static inline ppa_struct *ppa_dev(struct Scsi_Host *host) | |
49 | { | |
50 | return *(ppa_struct **)&host->hostdata; | |
51 | } | |
52 | ||
53 | static DEFINE_SPINLOCK(arbitration_lock); | |
54 | ||
55 | static void got_it(ppa_struct *dev) | |
56 | { | |
57 | dev->base = dev->dev->port->base; | |
58 | if (dev->cur_cmd) | |
59 | dev->cur_cmd->SCp.phase = 1; | |
60 | else | |
61 | wake_up(dev->waiting); | |
62 | } | |
63 | ||
64 | static void ppa_wakeup(void *ref) | |
65 | { | |
66 | ppa_struct *dev = (ppa_struct *) ref; | |
67 | unsigned long flags; | |
68 | ||
69 | spin_lock_irqsave(&arbitration_lock, flags); | |
70 | if (dev->wanted) { | |
71 | parport_claim(dev->dev); | |
72 | got_it(dev); | |
73 | dev->wanted = 0; | |
74 | } | |
75 | spin_unlock_irqrestore(&arbitration_lock, flags); | |
76 | return; | |
77 | } | |
78 | ||
79 | static int ppa_pb_claim(ppa_struct *dev) | |
80 | { | |
81 | unsigned long flags; | |
82 | int res = 1; | |
83 | spin_lock_irqsave(&arbitration_lock, flags); | |
84 | if (parport_claim(dev->dev) == 0) { | |
85 | got_it(dev); | |
86 | res = 0; | |
87 | } | |
88 | dev->wanted = res; | |
89 | spin_unlock_irqrestore(&arbitration_lock, flags); | |
90 | return res; | |
91 | } | |
92 | ||
93 | static void ppa_pb_dismiss(ppa_struct *dev) | |
94 | { | |
95 | unsigned long flags; | |
96 | int wanted; | |
97 | spin_lock_irqsave(&arbitration_lock, flags); | |
98 | wanted = dev->wanted; | |
99 | dev->wanted = 0; | |
100 | spin_unlock_irqrestore(&arbitration_lock, flags); | |
101 | if (!wanted) | |
102 | parport_release(dev->dev); | |
103 | } | |
104 | ||
105 | static inline void ppa_pb_release(ppa_struct *dev) | |
106 | { | |
107 | parport_release(dev->dev); | |
108 | } | |
109 | ||
110 | /* | |
111 | * Start of Chipset kludges | |
112 | */ | |
113 | ||
114 | /* This is to give the ppa driver a way to modify the timings (and other | |
115 | * parameters) by writing to the /proc/scsi/ppa/0 file. | |
116 | * Very simple method really... (To simple, no error checking :( ) | |
117 | * Reason: Kernel hackers HATE having to unload and reload modules for | |
118 | * testing... | |
119 | * Also gives a method to use a script to obtain optimum timings (TODO) | |
120 | */ | |
121 | ||
122 | static inline int ppa_proc_write(ppa_struct *dev, char *buffer, int length) | |
123 | { | |
124 | unsigned long x; | |
125 | ||
126 | if ((length > 5) && (strncmp(buffer, "mode=", 5) == 0)) { | |
127 | x = simple_strtoul(buffer + 5, NULL, 0); | |
128 | dev->mode = x; | |
129 | return length; | |
130 | } | |
131 | if ((length > 10) && (strncmp(buffer, "recon_tmo=", 10) == 0)) { | |
132 | x = simple_strtoul(buffer + 10, NULL, 0); | |
133 | dev->recon_tmo = x; | |
134 | printk("ppa: recon_tmo set to %ld\n", x); | |
135 | return length; | |
136 | } | |
137 | printk("ppa /proc: invalid variable\n"); | |
138 | return (-EINVAL); | |
139 | } | |
140 | ||
141 | static int ppa_proc_info(struct Scsi_Host *host, char *buffer, char **start, off_t offset, int length, int inout) | |
142 | { | |
143 | int len = 0; | |
144 | ppa_struct *dev = ppa_dev(host); | |
145 | ||
146 | if (inout) | |
147 | return ppa_proc_write(dev, buffer, length); | |
148 | ||
149 | len += sprintf(buffer + len, "Version : %s\n", PPA_VERSION); | |
150 | len += | |
151 | sprintf(buffer + len, "Parport : %s\n", | |
152 | dev->dev->port->name); | |
153 | len += | |
154 | sprintf(buffer + len, "Mode : %s\n", | |
155 | PPA_MODE_STRING[dev->mode]); | |
156 | #if PPA_DEBUG > 0 | |
157 | len += | |
158 | sprintf(buffer + len, "recon_tmo : %lu\n", dev->recon_tmo); | |
159 | #endif | |
160 | ||
161 | /* Request for beyond end of buffer */ | |
162 | if (offset > length) | |
163 | return 0; | |
164 | ||
165 | *start = buffer + offset; | |
166 | len -= offset; | |
167 | if (len > length) | |
168 | len = length; | |
169 | return len; | |
170 | } | |
171 | ||
172 | static int device_check(ppa_struct *dev); | |
173 | ||
174 | #if PPA_DEBUG > 0 | |
175 | #define ppa_fail(x,y) printk("ppa: ppa_fail(%i) from %s at line %d\n",\ | |
176 | y, __FUNCTION__, __LINE__); ppa_fail_func(x,y); | |
177 | static inline void ppa_fail_func(ppa_struct *dev, int error_code) | |
178 | #else | |
179 | static inline void ppa_fail(ppa_struct *dev, int error_code) | |
180 | #endif | |
181 | { | |
182 | /* If we fail a device then we trash status / message bytes */ | |
183 | if (dev->cur_cmd) { | |
184 | dev->cur_cmd->result = error_code << 16; | |
185 | dev->failed = 1; | |
186 | } | |
187 | } | |
188 | ||
189 | /* | |
190 | * Wait for the high bit to be set. | |
191 | * | |
192 | * In principle, this could be tied to an interrupt, but the adapter | |
193 | * doesn't appear to be designed to support interrupts. We spin on | |
194 | * the 0x80 ready bit. | |
195 | */ | |
196 | static unsigned char ppa_wait(ppa_struct *dev) | |
197 | { | |
198 | int k; | |
199 | unsigned short ppb = dev->base; | |
200 | unsigned char r; | |
201 | ||
202 | k = PPA_SPIN_TMO; | |
203 | /* Wait for bit 6 and 7 - PJC */ | |
204 | for (r = r_str(ppb); ((r & 0xc0) != 0xc0) && (k); k--) { | |
205 | udelay(1); | |
206 | r = r_str(ppb); | |
207 | } | |
208 | ||
209 | /* | |
210 | * return some status information. | |
211 | * Semantics: 0xc0 = ZIP wants more data | |
212 | * 0xd0 = ZIP wants to send more data | |
213 | * 0xe0 = ZIP is expecting SCSI command data | |
214 | * 0xf0 = end of transfer, ZIP is sending status | |
215 | */ | |
216 | if (k) | |
217 | return (r & 0xf0); | |
218 | ||
219 | /* Counter expired - Time out occurred */ | |
220 | ppa_fail(dev, DID_TIME_OUT); | |
221 | printk("ppa timeout in ppa_wait\n"); | |
222 | return 0; /* command timed out */ | |
223 | } | |
224 | ||
225 | /* | |
226 | * Clear EPP Timeout Bit | |
227 | */ | |
228 | static inline void epp_reset(unsigned short ppb) | |
229 | { | |
230 | int i; | |
231 | ||
232 | i = r_str(ppb); | |
233 | w_str(ppb, i); | |
234 | w_str(ppb, i & 0xfe); | |
235 | } | |
236 | ||
237 | /* | |
238 | * Wait for empty ECP fifo (if we are in ECP fifo mode only) | |
239 | */ | |
240 | static inline void ecp_sync(ppa_struct *dev) | |
241 | { | |
242 | int i, ppb_hi = dev->dev->port->base_hi; | |
243 | ||
244 | if (ppb_hi == 0) | |
245 | return; | |
246 | ||
247 | if ((r_ecr(ppb_hi) & 0xe0) == 0x60) { /* mode 011 == ECP fifo mode */ | |
248 | for (i = 0; i < 100; i++) { | |
249 | if (r_ecr(ppb_hi) & 0x01) | |
250 | return; | |
251 | udelay(5); | |
252 | } | |
253 | printk("ppa: ECP sync failed as data still present in FIFO.\n"); | |
254 | } | |
255 | } | |
256 | ||
257 | static int ppa_byte_out(unsigned short base, const char *buffer, int len) | |
258 | { | |
259 | int i; | |
260 | ||
261 | for (i = len; i; i--) { | |
262 | w_dtr(base, *buffer++); | |
263 | w_ctr(base, 0xe); | |
264 | w_ctr(base, 0xc); | |
265 | } | |
266 | return 1; /* All went well - we hope! */ | |
267 | } | |
268 | ||
269 | static int ppa_byte_in(unsigned short base, char *buffer, int len) | |
270 | { | |
271 | int i; | |
272 | ||
273 | for (i = len; i; i--) { | |
274 | *buffer++ = r_dtr(base); | |
275 | w_ctr(base, 0x27); | |
276 | w_ctr(base, 0x25); | |
277 | } | |
278 | return 1; /* All went well - we hope! */ | |
279 | } | |
280 | ||
281 | static int ppa_nibble_in(unsigned short base, char *buffer, int len) | |
282 | { | |
283 | for (; len; len--) { | |
284 | unsigned char h; | |
285 | ||
286 | w_ctr(base, 0x4); | |
287 | h = r_str(base) & 0xf0; | |
288 | w_ctr(base, 0x6); | |
289 | *buffer++ = h | ((r_str(base) & 0xf0) >> 4); | |
290 | } | |
291 | return 1; /* All went well - we hope! */ | |
292 | } | |
293 | ||
294 | static int ppa_out(ppa_struct *dev, char *buffer, int len) | |
295 | { | |
296 | int r; | |
297 | unsigned short ppb = dev->base; | |
298 | ||
299 | r = ppa_wait(dev); | |
300 | ||
301 | if ((r & 0x50) != 0x40) { | |
302 | ppa_fail(dev, DID_ERROR); | |
303 | return 0; | |
304 | } | |
305 | switch (dev->mode) { | |
306 | case PPA_NIBBLE: | |
307 | case PPA_PS2: | |
308 | /* 8 bit output, with a loop */ | |
309 | r = ppa_byte_out(ppb, buffer, len); | |
310 | break; | |
311 | ||
312 | case PPA_EPP_32: | |
313 | case PPA_EPP_16: | |
314 | case PPA_EPP_8: | |
315 | epp_reset(ppb); | |
316 | w_ctr(ppb, 0x4); | |
317 | #ifdef CONFIG_SCSI_IZIP_EPP16 | |
318 | if (!(((long) buffer | len) & 0x01)) | |
319 | outsw(ppb + 4, buffer, len >> 1); | |
320 | #else | |
321 | if (!(((long) buffer | len) & 0x03)) | |
322 | outsl(ppb + 4, buffer, len >> 2); | |
323 | #endif | |
324 | else | |
325 | outsb(ppb + 4, buffer, len); | |
326 | w_ctr(ppb, 0xc); | |
327 | r = !(r_str(ppb) & 0x01); | |
328 | w_ctr(ppb, 0xc); | |
329 | ecp_sync(dev); | |
330 | break; | |
331 | ||
332 | default: | |
333 | printk("PPA: bug in ppa_out()\n"); | |
334 | r = 0; | |
335 | } | |
336 | return r; | |
337 | } | |
338 | ||
339 | static int ppa_in(ppa_struct *dev, char *buffer, int len) | |
340 | { | |
341 | int r; | |
342 | unsigned short ppb = dev->base; | |
343 | ||
344 | r = ppa_wait(dev); | |
345 | ||
346 | if ((r & 0x50) != 0x50) { | |
347 | ppa_fail(dev, DID_ERROR); | |
348 | return 0; | |
349 | } | |
350 | switch (dev->mode) { | |
351 | case PPA_NIBBLE: | |
352 | /* 4 bit input, with a loop */ | |
353 | r = ppa_nibble_in(ppb, buffer, len); | |
354 | w_ctr(ppb, 0xc); | |
355 | break; | |
356 | ||
357 | case PPA_PS2: | |
358 | /* 8 bit input, with a loop */ | |
359 | w_ctr(ppb, 0x25); | |
360 | r = ppa_byte_in(ppb, buffer, len); | |
361 | w_ctr(ppb, 0x4); | |
362 | w_ctr(ppb, 0xc); | |
363 | break; | |
364 | ||
365 | case PPA_EPP_32: | |
366 | case PPA_EPP_16: | |
367 | case PPA_EPP_8: | |
368 | epp_reset(ppb); | |
369 | w_ctr(ppb, 0x24); | |
370 | #ifdef CONFIG_SCSI_IZIP_EPP16 | |
371 | if (!(((long) buffer | len) & 0x01)) | |
372 | insw(ppb + 4, buffer, len >> 1); | |
373 | #else | |
374 | if (!(((long) buffer | len) & 0x03)) | |
375 | insl(ppb + 4, buffer, len >> 2); | |
376 | #endif | |
377 | else | |
378 | insb(ppb + 4, buffer, len); | |
379 | w_ctr(ppb, 0x2c); | |
380 | r = !(r_str(ppb) & 0x01); | |
381 | w_ctr(ppb, 0x2c); | |
382 | ecp_sync(dev); | |
383 | break; | |
384 | ||
385 | default: | |
386 | printk("PPA: bug in ppa_ins()\n"); | |
387 | r = 0; | |
388 | break; | |
389 | } | |
390 | return r; | |
391 | } | |
392 | ||
393 | /* end of ppa_io.h */ | |
394 | static inline void ppa_d_pulse(unsigned short ppb, unsigned char b) | |
395 | { | |
396 | w_dtr(ppb, b); | |
397 | w_ctr(ppb, 0xc); | |
398 | w_ctr(ppb, 0xe); | |
399 | w_ctr(ppb, 0xc); | |
400 | w_ctr(ppb, 0x4); | |
401 | w_ctr(ppb, 0xc); | |
402 | } | |
403 | ||
404 | static void ppa_disconnect(ppa_struct *dev) | |
405 | { | |
406 | unsigned short ppb = dev->base; | |
407 | ||
408 | ppa_d_pulse(ppb, 0); | |
409 | ppa_d_pulse(ppb, 0x3c); | |
410 | ppa_d_pulse(ppb, 0x20); | |
411 | ppa_d_pulse(ppb, 0xf); | |
412 | } | |
413 | ||
414 | static inline void ppa_c_pulse(unsigned short ppb, unsigned char b) | |
415 | { | |
416 | w_dtr(ppb, b); | |
417 | w_ctr(ppb, 0x4); | |
418 | w_ctr(ppb, 0x6); | |
419 | w_ctr(ppb, 0x4); | |
420 | w_ctr(ppb, 0xc); | |
421 | } | |
422 | ||
423 | static inline void ppa_connect(ppa_struct *dev, int flag) | |
424 | { | |
425 | unsigned short ppb = dev->base; | |
426 | ||
427 | ppa_c_pulse(ppb, 0); | |
428 | ppa_c_pulse(ppb, 0x3c); | |
429 | ppa_c_pulse(ppb, 0x20); | |
430 | if ((flag == CONNECT_EPP_MAYBE) && IN_EPP_MODE(dev->mode)) | |
431 | ppa_c_pulse(ppb, 0xcf); | |
432 | else | |
433 | ppa_c_pulse(ppb, 0x8f); | |
434 | } | |
435 | ||
436 | static int ppa_select(ppa_struct *dev, int target) | |
437 | { | |
438 | int k; | |
439 | unsigned short ppb = dev->base; | |
440 | ||
441 | /* | |
442 | * Bit 6 (0x40) is the device selected bit. | |
443 | * First we must wait till the current device goes off line... | |
444 | */ | |
445 | k = PPA_SELECT_TMO; | |
446 | do { | |
447 | k--; | |
448 | udelay(1); | |
449 | } while ((r_str(ppb) & 0x40) && (k)); | |
450 | if (!k) | |
451 | return 0; | |
452 | ||
453 | w_dtr(ppb, (1 << target)); | |
454 | w_ctr(ppb, 0xe); | |
455 | w_ctr(ppb, 0xc); | |
456 | w_dtr(ppb, 0x80); /* This is NOT the initator */ | |
457 | w_ctr(ppb, 0x8); | |
458 | ||
459 | k = PPA_SELECT_TMO; | |
460 | do { | |
461 | k--; | |
462 | udelay(1); | |
463 | } | |
464 | while (!(r_str(ppb) & 0x40) && (k)); | |
465 | if (!k) | |
466 | return 0; | |
467 | ||
468 | return 1; | |
469 | } | |
470 | ||
471 | /* | |
472 | * This is based on a trace of what the Iomega DOS 'guest' driver does. | |
473 | * I've tried several different kinds of parallel ports with guest and | |
474 | * coded this to react in the same ways that it does. | |
475 | * | |
476 | * The return value from this function is just a hint about where the | |
477 | * handshaking failed. | |
478 | * | |
479 | */ | |
480 | static int ppa_init(ppa_struct *dev) | |
481 | { | |
482 | int retv; | |
483 | unsigned short ppb = dev->base; | |
484 | ||
485 | ppa_disconnect(dev); | |
486 | ppa_connect(dev, CONNECT_NORMAL); | |
487 | ||
488 | retv = 2; /* Failed */ | |
489 | ||
490 | w_ctr(ppb, 0xe); | |
491 | if ((r_str(ppb) & 0x08) == 0x08) | |
492 | retv--; | |
493 | ||
494 | w_ctr(ppb, 0xc); | |
495 | if ((r_str(ppb) & 0x08) == 0x00) | |
496 | retv--; | |
497 | ||
498 | if (!retv) | |
499 | ppa_reset_pulse(ppb); | |
500 | udelay(1000); /* Allow devices to settle down */ | |
501 | ppa_disconnect(dev); | |
502 | udelay(1000); /* Another delay to allow devices to settle */ | |
503 | ||
504 | if (retv) | |
505 | return -EIO; | |
506 | ||
507 | return device_check(dev); | |
508 | } | |
509 | ||
510 | static inline int ppa_send_command(struct scsi_cmnd *cmd) | |
511 | { | |
512 | ppa_struct *dev = ppa_dev(cmd->device->host); | |
513 | int k; | |
514 | ||
515 | w_ctr(dev->base, 0x0c); | |
516 | ||
517 | for (k = 0; k < cmd->cmd_len; k++) | |
518 | if (!ppa_out(dev, &cmd->cmnd[k], 1)) | |
519 | return 0; | |
520 | return 1; | |
521 | } | |
522 | ||
523 | /* | |
524 | * The bulk flag enables some optimisations in the data transfer loops, | |
525 | * it should be true for any command that transfers data in integral | |
526 | * numbers of sectors. | |
527 | * | |
528 | * The driver appears to remain stable if we speed up the parallel port | |
529 | * i/o in this function, but not elsewhere. | |
530 | */ | |
531 | static int ppa_completion(struct scsi_cmnd *cmd) | |
532 | { | |
533 | /* Return codes: | |
534 | * -1 Error | |
535 | * 0 Told to schedule | |
536 | * 1 Finished data transfer | |
537 | */ | |
538 | ppa_struct *dev = ppa_dev(cmd->device->host); | |
539 | unsigned short ppb = dev->base; | |
540 | unsigned long start_jiffies = jiffies; | |
541 | ||
542 | unsigned char r, v; | |
543 | int fast, bulk, status; | |
544 | ||
545 | v = cmd->cmnd[0]; | |
546 | bulk = ((v == READ_6) || | |
547 | (v == READ_10) || (v == WRITE_6) || (v == WRITE_10)); | |
548 | ||
549 | /* | |
550 | * We only get here if the drive is ready to comunicate, | |
551 | * hence no need for a full ppa_wait. | |
552 | */ | |
553 | r = (r_str(ppb) & 0xf0); | |
554 | ||
555 | while (r != (unsigned char) 0xf0) { | |
556 | /* | |
557 | * If we have been running for more than a full timer tick | |
558 | * then take a rest. | |
559 | */ | |
560 | if (time_after(jiffies, start_jiffies + 1)) | |
561 | return 0; | |
562 | ||
563 | if ((cmd->SCp.this_residual <= 0)) { | |
564 | ppa_fail(dev, DID_ERROR); | |
565 | return -1; /* ERROR_RETURN */ | |
566 | } | |
567 | ||
568 | /* On some hardware we have SCSI disconnected (6th bit low) | |
569 | * for about 100usecs. It is too expensive to wait a | |
570 | * tick on every loop so we busy wait for no more than | |
571 | * 500usecs to give the drive a chance first. We do not | |
572 | * change things for "normal" hardware since generally | |
573 | * the 6th bit is always high. | |
574 | * This makes the CPU load higher on some hardware | |
575 | * but otherwise we can not get more than 50K/secs | |
576 | * on this problem hardware. | |
577 | */ | |
578 | if ((r & 0xc0) != 0xc0) { | |
579 | /* Wait for reconnection should be no more than | |
580 | * jiffy/2 = 5ms = 5000 loops | |
581 | */ | |
582 | unsigned long k = dev->recon_tmo; | |
583 | for (; k && ((r = (r_str(ppb) & 0xf0)) & 0xc0) != 0xc0; | |
584 | k--) | |
585 | udelay(1); | |
586 | ||
587 | if (!k) | |
588 | return 0; | |
589 | } | |
590 | ||
591 | /* determine if we should use burst I/O */ | |
592 | fast = (bulk && (cmd->SCp.this_residual >= PPA_BURST_SIZE)) | |
593 | ? PPA_BURST_SIZE : 1; | |
594 | ||
595 | if (r == (unsigned char) 0xc0) | |
596 | status = ppa_out(dev, cmd->SCp.ptr, fast); | |
597 | else | |
598 | status = ppa_in(dev, cmd->SCp.ptr, fast); | |
599 | ||
600 | cmd->SCp.ptr += fast; | |
601 | cmd->SCp.this_residual -= fast; | |
602 | ||
603 | if (!status) { | |
604 | ppa_fail(dev, DID_BUS_BUSY); | |
605 | return -1; /* ERROR_RETURN */ | |
606 | } | |
607 | if (cmd->SCp.buffer && !cmd->SCp.this_residual) { | |
608 | /* if scatter/gather, advance to the next segment */ | |
609 | if (cmd->SCp.buffers_residual--) { | |
610 | cmd->SCp.buffer++; | |
611 | cmd->SCp.this_residual = | |
612 | cmd->SCp.buffer->length; | |
613 | cmd->SCp.ptr = | |
614 | page_address(cmd->SCp.buffer->page) + | |
615 | cmd->SCp.buffer->offset; | |
616 | } | |
617 | } | |
618 | /* Now check to see if the drive is ready to comunicate */ | |
619 | r = (r_str(ppb) & 0xf0); | |
620 | /* If not, drop back down to the scheduler and wait a timer tick */ | |
621 | if (!(r & 0x80)) | |
622 | return 0; | |
623 | } | |
624 | return 1; /* FINISH_RETURN */ | |
625 | } | |
626 | ||
627 | /* | |
628 | * Since the PPA itself doesn't generate interrupts, we use | |
629 | * the scheduler's task queue to generate a stream of call-backs and | |
630 | * complete the request when the drive is ready. | |
631 | */ | |
632 | static void ppa_interrupt(void *data) | |
633 | { | |
634 | ppa_struct *dev = (ppa_struct *) data; | |
635 | struct scsi_cmnd *cmd = dev->cur_cmd; | |
636 | ||
637 | if (!cmd) { | |
638 | printk("PPA: bug in ppa_interrupt\n"); | |
639 | return; | |
640 | } | |
641 | if (ppa_engine(dev, cmd)) { | |
642 | dev->ppa_tq.data = (void *) dev; | |
643 | schedule_delayed_work(&dev->ppa_tq, 1); | |
644 | return; | |
645 | } | |
646 | /* Command must of completed hence it is safe to let go... */ | |
647 | #if PPA_DEBUG > 0 | |
648 | switch ((cmd->result >> 16) & 0xff) { | |
649 | case DID_OK: | |
650 | break; | |
651 | case DID_NO_CONNECT: | |
652 | printk("ppa: no device at SCSI ID %i\n", cmd->device->target); | |
653 | break; | |
654 | case DID_BUS_BUSY: | |
655 | printk("ppa: BUS BUSY - EPP timeout detected\n"); | |
656 | break; | |
657 | case DID_TIME_OUT: | |
658 | printk("ppa: unknown timeout\n"); | |
659 | break; | |
660 | case DID_ABORT: | |
661 | printk("ppa: told to abort\n"); | |
662 | break; | |
663 | case DID_PARITY: | |
664 | printk("ppa: parity error (???)\n"); | |
665 | break; | |
666 | case DID_ERROR: | |
667 | printk("ppa: internal driver error\n"); | |
668 | break; | |
669 | case DID_RESET: | |
670 | printk("ppa: told to reset device\n"); | |
671 | break; | |
672 | case DID_BAD_INTR: | |
673 | printk("ppa: bad interrupt (???)\n"); | |
674 | break; | |
675 | default: | |
676 | printk("ppa: bad return code (%02x)\n", | |
677 | (cmd->result >> 16) & 0xff); | |
678 | } | |
679 | #endif | |
680 | ||
681 | if (cmd->SCp.phase > 1) | |
682 | ppa_disconnect(dev); | |
683 | ||
684 | ppa_pb_dismiss(dev); | |
685 | ||
686 | dev->cur_cmd = NULL; | |
687 | ||
688 | cmd->scsi_done(cmd); | |
689 | } | |
690 | ||
691 | static int ppa_engine(ppa_struct *dev, struct scsi_cmnd *cmd) | |
692 | { | |
693 | unsigned short ppb = dev->base; | |
694 | unsigned char l = 0, h = 0; | |
695 | int retv; | |
696 | ||
697 | /* First check for any errors that may of occurred | |
698 | * Here we check for internal errors | |
699 | */ | |
700 | if (dev->failed) | |
701 | return 0; | |
702 | ||
703 | switch (cmd->SCp.phase) { | |
704 | case 0: /* Phase 0 - Waiting for parport */ | |
705 | if (time_after(jiffies, dev->jstart + HZ)) { | |
706 | /* | |
707 | * We waited more than a second | |
708 | * for parport to call us | |
709 | */ | |
710 | ppa_fail(dev, DID_BUS_BUSY); | |
711 | return 0; | |
712 | } | |
713 | return 1; /* wait until ppa_wakeup claims parport */ | |
714 | case 1: /* Phase 1 - Connected */ | |
715 | { /* Perform a sanity check for cable unplugged */ | |
716 | int retv = 2; /* Failed */ | |
717 | ||
718 | ppa_connect(dev, CONNECT_EPP_MAYBE); | |
719 | ||
720 | w_ctr(ppb, 0xe); | |
721 | if ((r_str(ppb) & 0x08) == 0x08) | |
722 | retv--; | |
723 | ||
724 | w_ctr(ppb, 0xc); | |
725 | if ((r_str(ppb) & 0x08) == 0x00) | |
726 | retv--; | |
727 | ||
728 | if (retv) { | |
729 | if ((jiffies - dev->jstart) > (1 * HZ)) { | |
730 | printk | |
731 | ("ppa: Parallel port cable is unplugged!!\n"); | |
732 | ppa_fail(dev, DID_BUS_BUSY); | |
733 | return 0; | |
734 | } else { | |
735 | ppa_disconnect(dev); | |
736 | return 1; /* Try again in a jiffy */ | |
737 | } | |
738 | } | |
739 | cmd->SCp.phase++; | |
740 | } | |
741 | ||
742 | case 2: /* Phase 2 - We are now talking to the scsi bus */ | |
743 | if (!ppa_select(dev, cmd->device->id)) { | |
744 | ppa_fail(dev, DID_NO_CONNECT); | |
745 | return 0; | |
746 | } | |
747 | cmd->SCp.phase++; | |
748 | ||
749 | case 3: /* Phase 3 - Ready to accept a command */ | |
750 | w_ctr(ppb, 0x0c); | |
751 | if (!(r_str(ppb) & 0x80)) | |
752 | return 1; | |
753 | ||
754 | if (!ppa_send_command(cmd)) | |
755 | return 0; | |
756 | cmd->SCp.phase++; | |
757 | ||
758 | case 4: /* Phase 4 - Setup scatter/gather buffers */ | |
759 | if (cmd->use_sg) { | |
760 | /* if many buffers are available, start filling the first */ | |
761 | cmd->SCp.buffer = | |
762 | (struct scatterlist *) cmd->request_buffer; | |
763 | cmd->SCp.this_residual = cmd->SCp.buffer->length; | |
764 | cmd->SCp.ptr = | |
765 | page_address(cmd->SCp.buffer->page) + | |
766 | cmd->SCp.buffer->offset; | |
767 | } else { | |
768 | /* else fill the only available buffer */ | |
769 | cmd->SCp.buffer = NULL; | |
770 | cmd->SCp.this_residual = cmd->request_bufflen; | |
771 | cmd->SCp.ptr = cmd->request_buffer; | |
772 | } | |
773 | cmd->SCp.buffers_residual = cmd->use_sg - 1; | |
774 | cmd->SCp.phase++; | |
775 | ||
776 | case 5: /* Phase 5 - Data transfer stage */ | |
777 | w_ctr(ppb, 0x0c); | |
778 | if (!(r_str(ppb) & 0x80)) | |
779 | return 1; | |
780 | ||
781 | retv = ppa_completion(cmd); | |
782 | if (retv == -1) | |
783 | return 0; | |
784 | if (retv == 0) | |
785 | return 1; | |
786 | cmd->SCp.phase++; | |
787 | ||
788 | case 6: /* Phase 6 - Read status/message */ | |
789 | cmd->result = DID_OK << 16; | |
790 | /* Check for data overrun */ | |
791 | if (ppa_wait(dev) != (unsigned char) 0xf0) { | |
792 | ppa_fail(dev, DID_ERROR); | |
793 | return 0; | |
794 | } | |
795 | if (ppa_in(dev, &l, 1)) { /* read status byte */ | |
796 | /* Check for optional message byte */ | |
797 | if (ppa_wait(dev) == (unsigned char) 0xf0) | |
798 | ppa_in(dev, &h, 1); | |
799 | cmd->result = | |
800 | (DID_OK << 16) + (h << 8) + (l & STATUS_MASK); | |
801 | } | |
802 | return 0; /* Finished */ | |
803 | break; | |
804 | ||
805 | default: | |
806 | printk("ppa: Invalid scsi phase\n"); | |
807 | } | |
808 | return 0; | |
809 | } | |
810 | ||
811 | static int ppa_queuecommand(struct scsi_cmnd *cmd, | |
812 | void (*done) (struct scsi_cmnd *)) | |
813 | { | |
814 | ppa_struct *dev = ppa_dev(cmd->device->host); | |
815 | ||
816 | if (dev->cur_cmd) { | |
817 | printk("PPA: bug in ppa_queuecommand\n"); | |
818 | return 0; | |
819 | } | |
820 | dev->failed = 0; | |
821 | dev->jstart = jiffies; | |
822 | dev->cur_cmd = cmd; | |
823 | cmd->scsi_done = done; | |
824 | cmd->result = DID_ERROR << 16; /* default return code */ | |
825 | cmd->SCp.phase = 0; /* bus free */ | |
826 | ||
827 | dev->ppa_tq.data = dev; | |
828 | schedule_work(&dev->ppa_tq); | |
829 | ||
830 | ppa_pb_claim(dev); | |
831 | ||
832 | return 0; | |
833 | } | |
834 | ||
835 | /* | |
836 | * Apparently the disk->capacity attribute is off by 1 sector | |
837 | * for all disk drives. We add the one here, but it should really | |
838 | * be done in sd.c. Even if it gets fixed there, this will still | |
839 | * work. | |
840 | */ | |
841 | static int ppa_biosparam(struct scsi_device *sdev, struct block_device *dev, | |
842 | sector_t capacity, int ip[]) | |
843 | { | |
844 | ip[0] = 0x40; | |
845 | ip[1] = 0x20; | |
846 | ip[2] = ((unsigned long) capacity + 1) / (ip[0] * ip[1]); | |
847 | if (ip[2] > 1024) { | |
848 | ip[0] = 0xff; | |
849 | ip[1] = 0x3f; | |
850 | ip[2] = ((unsigned long) capacity + 1) / (ip[0] * ip[1]); | |
851 | if (ip[2] > 1023) | |
852 | ip[2] = 1023; | |
853 | } | |
854 | return 0; | |
855 | } | |
856 | ||
857 | static int ppa_abort(struct scsi_cmnd *cmd) | |
858 | { | |
859 | ppa_struct *dev = ppa_dev(cmd->device->host); | |
860 | /* | |
861 | * There is no method for aborting commands since Iomega | |
862 | * have tied the SCSI_MESSAGE line high in the interface | |
863 | */ | |
864 | ||
865 | switch (cmd->SCp.phase) { | |
866 | case 0: /* Do not have access to parport */ | |
867 | case 1: /* Have not connected to interface */ | |
868 | dev->cur_cmd = NULL; /* Forget the problem */ | |
869 | return SUCCESS; | |
870 | break; | |
871 | default: /* SCSI command sent, can not abort */ | |
872 | return FAILED; | |
873 | break; | |
874 | } | |
875 | } | |
876 | ||
877 | static void ppa_reset_pulse(unsigned int base) | |
878 | { | |
879 | w_dtr(base, 0x40); | |
880 | w_ctr(base, 0x8); | |
881 | udelay(30); | |
882 | w_ctr(base, 0xc); | |
883 | } | |
884 | ||
885 | static int ppa_reset(struct scsi_cmnd *cmd) | |
886 | { | |
887 | ppa_struct *dev = ppa_dev(cmd->device->host); | |
888 | ||
889 | if (cmd->SCp.phase) | |
890 | ppa_disconnect(dev); | |
891 | dev->cur_cmd = NULL; /* Forget the problem */ | |
892 | ||
893 | ppa_connect(dev, CONNECT_NORMAL); | |
894 | ppa_reset_pulse(dev->base); | |
68b3aa7c | 895 | mdelay(1); /* device settle delay */ |
1da177e4 | 896 | ppa_disconnect(dev); |
68b3aa7c | 897 | mdelay(1); /* device settle delay */ |
1da177e4 LT |
898 | return SUCCESS; |
899 | } | |
900 | ||
901 | static int device_check(ppa_struct *dev) | |
902 | { | |
903 | /* This routine looks for a device and then attempts to use EPP | |
904 | to send a command. If all goes as planned then EPP is available. */ | |
905 | ||
906 | static char cmd[6] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }; | |
907 | int loop, old_mode, status, k, ppb = dev->base; | |
908 | unsigned char l; | |
909 | ||
910 | old_mode = dev->mode; | |
911 | for (loop = 0; loop < 8; loop++) { | |
912 | /* Attempt to use EPP for Test Unit Ready */ | |
913 | if ((ppb & 0x0007) == 0x0000) | |
914 | dev->mode = PPA_EPP_32; | |
915 | ||
916 | second_pass: | |
917 | ppa_connect(dev, CONNECT_EPP_MAYBE); | |
918 | /* Select SCSI device */ | |
919 | if (!ppa_select(dev, loop)) { | |
920 | ppa_disconnect(dev); | |
921 | continue; | |
922 | } | |
923 | printk("ppa: Found device at ID %i, Attempting to use %s\n", | |
924 | loop, PPA_MODE_STRING[dev->mode]); | |
925 | ||
926 | /* Send SCSI command */ | |
927 | status = 1; | |
928 | w_ctr(ppb, 0x0c); | |
929 | for (l = 0; (l < 6) && (status); l++) | |
930 | status = ppa_out(dev, cmd, 1); | |
931 | ||
932 | if (!status) { | |
933 | ppa_disconnect(dev); | |
934 | ppa_connect(dev, CONNECT_EPP_MAYBE); | |
935 | w_dtr(ppb, 0x40); | |
936 | w_ctr(ppb, 0x08); | |
937 | udelay(30); | |
938 | w_ctr(ppb, 0x0c); | |
939 | udelay(1000); | |
940 | ppa_disconnect(dev); | |
941 | udelay(1000); | |
942 | if (dev->mode == PPA_EPP_32) { | |
943 | dev->mode = old_mode; | |
944 | goto second_pass; | |
945 | } | |
946 | return -EIO; | |
947 | } | |
948 | w_ctr(ppb, 0x0c); | |
949 | k = 1000000; /* 1 Second */ | |
950 | do { | |
951 | l = r_str(ppb); | |
952 | k--; | |
953 | udelay(1); | |
954 | } while (!(l & 0x80) && (k)); | |
955 | ||
956 | l &= 0xf0; | |
957 | ||
958 | if (l != 0xf0) { | |
959 | ppa_disconnect(dev); | |
960 | ppa_connect(dev, CONNECT_EPP_MAYBE); | |
961 | ppa_reset_pulse(ppb); | |
962 | udelay(1000); | |
963 | ppa_disconnect(dev); | |
964 | udelay(1000); | |
965 | if (dev->mode == PPA_EPP_32) { | |
966 | dev->mode = old_mode; | |
967 | goto second_pass; | |
968 | } | |
969 | return -EIO; | |
970 | } | |
971 | ppa_disconnect(dev); | |
972 | printk("ppa: Communication established with ID %i using %s\n", | |
973 | loop, PPA_MODE_STRING[dev->mode]); | |
974 | ppa_connect(dev, CONNECT_EPP_MAYBE); | |
975 | ppa_reset_pulse(ppb); | |
976 | udelay(1000); | |
977 | ppa_disconnect(dev); | |
978 | udelay(1000); | |
979 | return 0; | |
980 | } | |
981 | return -ENODEV; | |
982 | } | |
983 | ||
984 | static struct scsi_host_template ppa_template = { | |
985 | .module = THIS_MODULE, | |
986 | .proc_name = "ppa", | |
987 | .proc_info = ppa_proc_info, | |
988 | .name = "Iomega VPI0 (ppa) interface", | |
989 | .queuecommand = ppa_queuecommand, | |
990 | .eh_abort_handler = ppa_abort, | |
991 | .eh_bus_reset_handler = ppa_reset, | |
992 | .eh_host_reset_handler = ppa_reset, | |
993 | .bios_param = ppa_biosparam, | |
994 | .this_id = -1, | |
995 | .sg_tablesize = SG_ALL, | |
996 | .cmd_per_lun = 1, | |
997 | .use_clustering = ENABLE_CLUSTERING, | |
998 | .can_queue = 1, | |
999 | }; | |
1000 | ||
1001 | /*************************************************************************** | |
1002 | * Parallel port probing routines * | |
1003 | ***************************************************************************/ | |
1004 | ||
1005 | static LIST_HEAD(ppa_hosts); | |
1006 | ||
1007 | static int __ppa_attach(struct parport *pb) | |
1008 | { | |
1009 | struct Scsi_Host *host; | |
1010 | DECLARE_WAIT_QUEUE_HEAD(waiting); | |
1011 | DEFINE_WAIT(wait); | |
1012 | ppa_struct *dev; | |
1013 | int ports; | |
1014 | int modes, ppb, ppb_hi; | |
1015 | int err = -ENOMEM; | |
1016 | ||
1017 | dev = kmalloc(sizeof(ppa_struct), GFP_KERNEL); | |
1018 | if (!dev) | |
1019 | return -ENOMEM; | |
1020 | memset(dev, 0, sizeof(ppa_struct)); | |
1021 | dev->base = -1; | |
1022 | dev->mode = PPA_AUTODETECT; | |
1023 | dev->recon_tmo = PPA_RECON_TMO; | |
1024 | init_waitqueue_head(&waiting); | |
1025 | dev->dev = parport_register_device(pb, "ppa", NULL, ppa_wakeup, | |
1026 | NULL, 0, dev); | |
1027 | ||
1028 | if (!dev->dev) | |
1029 | goto out; | |
1030 | ||
1031 | /* Claim the bus so it remembers what we do to the control | |
1032 | * registers. [ CTR and ECP ] | |
1033 | */ | |
1034 | err = -EBUSY; | |
1035 | dev->waiting = &waiting; | |
1036 | prepare_to_wait(&waiting, &wait, TASK_UNINTERRUPTIBLE); | |
1037 | if (ppa_pb_claim(dev)) | |
1038 | schedule_timeout(3 * HZ); | |
1039 | if (dev->wanted) { | |
1040 | printk(KERN_ERR "ppa%d: failed to claim parport because " | |
1041 | "a pardevice is owning the port for too long " | |
1042 | "time!\n", pb->number); | |
1043 | ppa_pb_dismiss(dev); | |
1044 | dev->waiting = NULL; | |
1045 | finish_wait(&waiting, &wait); | |
1046 | goto out1; | |
1047 | } | |
1048 | dev->waiting = NULL; | |
1049 | finish_wait(&waiting, &wait); | |
1050 | ppb = dev->base = dev->dev->port->base; | |
1051 | ppb_hi = dev->dev->port->base_hi; | |
1052 | w_ctr(ppb, 0x0c); | |
1053 | modes = dev->dev->port->modes; | |
1054 | ||
1055 | /* Mode detection works up the chain of speed | |
1056 | * This avoids a nasty if-then-else-if-... tree | |
1057 | */ | |
1058 | dev->mode = PPA_NIBBLE; | |
1059 | ||
1060 | if (modes & PARPORT_MODE_TRISTATE) | |
1061 | dev->mode = PPA_PS2; | |
1062 | ||
1063 | if (modes & PARPORT_MODE_ECP) { | |
1064 | w_ecr(ppb_hi, 0x20); | |
1065 | dev->mode = PPA_PS2; | |
1066 | } | |
1067 | if ((modes & PARPORT_MODE_EPP) && (modes & PARPORT_MODE_ECP)) | |
1068 | w_ecr(ppb_hi, 0x80); | |
1069 | ||
1070 | /* Done configuration */ | |
1071 | ||
1072 | err = ppa_init(dev); | |
1073 | ppa_pb_release(dev); | |
1074 | ||
1075 | if (err) | |
1076 | goto out1; | |
1077 | ||
1078 | /* now the glue ... */ | |
1079 | if (dev->mode == PPA_NIBBLE || dev->mode == PPA_PS2) | |
1080 | ports = 3; | |
1081 | else | |
1082 | ports = 8; | |
1083 | ||
1084 | INIT_WORK(&dev->ppa_tq, ppa_interrupt, dev); | |
1085 | ||
1086 | err = -ENOMEM; | |
1087 | host = scsi_host_alloc(&ppa_template, sizeof(ppa_struct *)); | |
1088 | if (!host) | |
1089 | goto out1; | |
1090 | host->io_port = pb->base; | |
1091 | host->n_io_port = ports; | |
1092 | host->dma_channel = -1; | |
1093 | host->unique_id = pb->number; | |
1094 | *(ppa_struct **)&host->hostdata = dev; | |
1095 | dev->host = host; | |
1096 | list_add_tail(&dev->list, &ppa_hosts); | |
1097 | err = scsi_add_host(host, NULL); | |
1098 | if (err) | |
1099 | goto out2; | |
1100 | scsi_scan_host(host); | |
1101 | return 0; | |
1102 | out2: | |
1103 | list_del_init(&dev->list); | |
1104 | scsi_host_put(host); | |
1105 | out1: | |
1106 | parport_unregister_device(dev->dev); | |
1107 | out: | |
1108 | kfree(dev); | |
1109 | return err; | |
1110 | } | |
1111 | ||
1112 | static void ppa_attach(struct parport *pb) | |
1113 | { | |
1114 | __ppa_attach(pb); | |
1115 | } | |
1116 | ||
1117 | static void ppa_detach(struct parport *pb) | |
1118 | { | |
1119 | ppa_struct *dev; | |
1120 | list_for_each_entry(dev, &ppa_hosts, list) { | |
1121 | if (dev->dev->port == pb) { | |
1122 | list_del_init(&dev->list); | |
1123 | scsi_remove_host(dev->host); | |
1124 | scsi_host_put(dev->host); | |
1125 | parport_unregister_device(dev->dev); | |
1126 | kfree(dev); | |
1127 | break; | |
1128 | } | |
1129 | } | |
1130 | } | |
1131 | ||
1132 | static struct parport_driver ppa_driver = { | |
1133 | .name = "ppa", | |
1134 | .attach = ppa_attach, | |
1135 | .detach = ppa_detach, | |
1136 | }; | |
1137 | ||
1138 | static int __init ppa_driver_init(void) | |
1139 | { | |
1140 | printk("ppa: Version %s\n", PPA_VERSION); | |
1141 | return parport_register_driver(&ppa_driver); | |
1142 | } | |
1143 | ||
1144 | static void __exit ppa_driver_exit(void) | |
1145 | { | |
1146 | parport_unregister_driver(&ppa_driver); | |
1147 | } | |
1148 | ||
1149 | module_init(ppa_driver_init); | |
1150 | module_exit(ppa_driver_exit); | |
1151 | MODULE_LICENSE("GPL"); |