Commit | Line | Data |
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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 | * | |
1da177e4 LT |
9 | */ |
10 | ||
1da177e4 LT |
11 | #include <linux/init.h> |
12 | #include <linux/kernel.h> | |
5a0e3ad6 | 13 | #include <linux/slab.h> |
1da177e4 LT |
14 | #include <linux/module.h> |
15 | #include <linux/blkdev.h> | |
16 | #include <linux/parport.h> | |
17 | #include <linux/workqueue.h> | |
68b3aa7c | 18 | #include <linux/delay.h> |
60c904ae | 19 | #include <linux/jiffies.h> |
1da177e4 LT |
20 | #include <asm/io.h> |
21 | ||
22 | #include <scsi/scsi.h> | |
23 | #include <scsi/scsi_cmnd.h> | |
24 | #include <scsi/scsi_device.h> | |
25 | #include <scsi/scsi_host.h> | |
26 | ||
27 | ||
28 | static void ppa_reset_pulse(unsigned int base); | |
29 | ||
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 */ | |
c4028958 | 35 | struct delayed_work ppa_tq; /* Polling interrupt stuff */ |
1da177e4 LT |
36 | unsigned long jstart; /* Jiffies at start */ |
37 | unsigned long recon_tmo; /* How many usecs to wait for reconnection (6th bit) */ | |
38 | unsigned int failed:1; /* Failure flag */ | |
39 | unsigned wanted:1; /* Parport sharing busy flag */ | |
40 | wait_queue_head_t *waiting; | |
41 | struct Scsi_Host *host; | |
42 | struct list_head list; | |
43 | } ppa_struct; | |
44 | ||
45 | #include "ppa.h" | |
46 | ||
47 | static inline ppa_struct *ppa_dev(struct Scsi_Host *host) | |
48 | { | |
49 | return *(ppa_struct **)&host->hostdata; | |
50 | } | |
51 | ||
52 | static DEFINE_SPINLOCK(arbitration_lock); | |
53 | ||
54 | static void got_it(ppa_struct *dev) | |
55 | { | |
56 | dev->base = dev->dev->port->base; | |
57 | if (dev->cur_cmd) | |
58 | dev->cur_cmd->SCp.phase = 1; | |
59 | else | |
60 | wake_up(dev->waiting); | |
61 | } | |
62 | ||
63 | static void ppa_wakeup(void *ref) | |
64 | { | |
65 | ppa_struct *dev = (ppa_struct *) ref; | |
66 | unsigned long flags; | |
67 | ||
68 | spin_lock_irqsave(&arbitration_lock, flags); | |
69 | if (dev->wanted) { | |
70 | parport_claim(dev->dev); | |
71 | got_it(dev); | |
72 | dev->wanted = 0; | |
73 | } | |
74 | spin_unlock_irqrestore(&arbitration_lock, flags); | |
75 | return; | |
76 | } | |
77 | ||
78 | static int ppa_pb_claim(ppa_struct *dev) | |
79 | { | |
80 | unsigned long flags; | |
81 | int res = 1; | |
82 | spin_lock_irqsave(&arbitration_lock, flags); | |
83 | if (parport_claim(dev->dev) == 0) { | |
84 | got_it(dev); | |
85 | res = 0; | |
86 | } | |
87 | dev->wanted = res; | |
88 | spin_unlock_irqrestore(&arbitration_lock, flags); | |
89 | return res; | |
90 | } | |
91 | ||
92 | static void ppa_pb_dismiss(ppa_struct *dev) | |
93 | { | |
94 | unsigned long flags; | |
95 | int wanted; | |
96 | spin_lock_irqsave(&arbitration_lock, flags); | |
97 | wanted = dev->wanted; | |
98 | dev->wanted = 0; | |
99 | spin_unlock_irqrestore(&arbitration_lock, flags); | |
100 | if (!wanted) | |
101 | parport_release(dev->dev); | |
102 | } | |
103 | ||
104 | static inline void ppa_pb_release(ppa_struct *dev) | |
105 | { | |
106 | parport_release(dev->dev); | |
107 | } | |
108 | ||
109 | /* | |
110 | * Start of Chipset kludges | |
111 | */ | |
112 | ||
113 | /* This is to give the ppa driver a way to modify the timings (and other | |
114 | * parameters) by writing to the /proc/scsi/ppa/0 file. | |
115 | * Very simple method really... (To simple, no error checking :( ) | |
116 | * Reason: Kernel hackers HATE having to unload and reload modules for | |
117 | * testing... | |
118 | * Also gives a method to use a script to obtain optimum timings (TODO) | |
119 | */ | |
120 | ||
121 | static inline int ppa_proc_write(ppa_struct *dev, char *buffer, int length) | |
122 | { | |
123 | unsigned long x; | |
124 | ||
125 | if ((length > 5) && (strncmp(buffer, "mode=", 5) == 0)) { | |
126 | x = simple_strtoul(buffer + 5, NULL, 0); | |
127 | dev->mode = x; | |
128 | return length; | |
129 | } | |
130 | if ((length > 10) && (strncmp(buffer, "recon_tmo=", 10) == 0)) { | |
131 | x = simple_strtoul(buffer + 10, NULL, 0); | |
132 | dev->recon_tmo = x; | |
cebadc5c | 133 | printk(KERN_INFO "ppa: recon_tmo set to %ld\n", x); |
1da177e4 LT |
134 | return length; |
135 | } | |
cebadc5c AC |
136 | printk(KERN_WARNING "ppa /proc: invalid variable\n"); |
137 | return -EINVAL; | |
1da177e4 LT |
138 | } |
139 | ||
140 | static int ppa_proc_info(struct Scsi_Host *host, char *buffer, char **start, off_t offset, int length, int inout) | |
141 | { | |
142 | int len = 0; | |
143 | ppa_struct *dev = ppa_dev(host); | |
144 | ||
145 | if (inout) | |
146 | return ppa_proc_write(dev, buffer, length); | |
147 | ||
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 | |
159 | ||
160 | /* Request for beyond end of buffer */ | |
161 | if (offset > length) | |
162 | return 0; | |
163 | ||
164 | *start = buffer + offset; | |
165 | len -= offset; | |
166 | if (len > length) | |
167 | len = length; | |
168 | return len; | |
169 | } | |
170 | ||
171 | static int device_check(ppa_struct *dev); | |
172 | ||
173 | #if PPA_DEBUG > 0 | |
174 | #define ppa_fail(x,y) printk("ppa: ppa_fail(%i) from %s at line %d\n",\ | |
cadbd4a5 | 175 | y, __func__, __LINE__); ppa_fail_func(x,y); |
1da177e4 LT |
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 | |
180 | { | |
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; | |
185 | } | |
186 | } | |
187 | ||
188 | /* | |
189 | * Wait for the high bit to be set. | |
190 | * | |
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. | |
194 | */ | |
195 | static unsigned char ppa_wait(ppa_struct *dev) | |
196 | { | |
197 | int k; | |
198 | unsigned short ppb = dev->base; | |
199 | unsigned char r; | |
200 | ||
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); | |
206 | } | |
207 | ||
208 | /* | |
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 | |
214 | */ | |
215 | if (k) | |
216 | return (r & 0xf0); | |
217 | ||
218 | /* Counter expired - Time out occurred */ | |
219 | ppa_fail(dev, DID_TIME_OUT); | |
cebadc5c | 220 | printk(KERN_WARNING "ppa timeout in ppa_wait\n"); |
1da177e4 LT |
221 | return 0; /* command timed out */ |
222 | } | |
223 | ||
224 | /* | |
225 | * Clear EPP Timeout Bit | |
226 | */ | |
227 | static inline void epp_reset(unsigned short ppb) | |
228 | { | |
229 | int i; | |
230 | ||
231 | i = r_str(ppb); | |
232 | w_str(ppb, i); | |
233 | w_str(ppb, i & 0xfe); | |
234 | } | |
235 | ||
236 | /* | |
237 | * Wait for empty ECP fifo (if we are in ECP fifo mode only) | |
238 | */ | |
239 | static inline void ecp_sync(ppa_struct *dev) | |
240 | { | |
241 | int i, ppb_hi = dev->dev->port->base_hi; | |
242 | ||
243 | if (ppb_hi == 0) | |
244 | return; | |
245 | ||
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); | |
251 | } | |
cebadc5c | 252 | printk(KERN_WARNING "ppa: ECP sync failed as data still present in FIFO.\n"); |
1da177e4 LT |
253 | } |
254 | } | |
255 | ||
256 | static int ppa_byte_out(unsigned short base, const char *buffer, int len) | |
257 | { | |
258 | int i; | |
259 | ||
260 | for (i = len; i; i--) { | |
261 | w_dtr(base, *buffer++); | |
262 | w_ctr(base, 0xe); | |
263 | w_ctr(base, 0xc); | |
264 | } | |
265 | return 1; /* All went well - we hope! */ | |
266 | } | |
267 | ||
268 | static int ppa_byte_in(unsigned short base, char *buffer, int len) | |
269 | { | |
270 | int i; | |
271 | ||
272 | for (i = len; i; i--) { | |
273 | *buffer++ = r_dtr(base); | |
274 | w_ctr(base, 0x27); | |
275 | w_ctr(base, 0x25); | |
276 | } | |
277 | return 1; /* All went well - we hope! */ | |
278 | } | |
279 | ||
280 | static int ppa_nibble_in(unsigned short base, char *buffer, int len) | |
281 | { | |
282 | for (; len; len--) { | |
283 | unsigned char h; | |
284 | ||
285 | w_ctr(base, 0x4); | |
286 | h = r_str(base) & 0xf0; | |
287 | w_ctr(base, 0x6); | |
288 | *buffer++ = h | ((r_str(base) & 0xf0) >> 4); | |
289 | } | |
290 | return 1; /* All went well - we hope! */ | |
291 | } | |
292 | ||
293 | static int ppa_out(ppa_struct *dev, char *buffer, int len) | |
294 | { | |
295 | int r; | |
296 | unsigned short ppb = dev->base; | |
297 | ||
298 | r = ppa_wait(dev); | |
299 | ||
300 | if ((r & 0x50) != 0x40) { | |
301 | ppa_fail(dev, DID_ERROR); | |
302 | return 0; | |
303 | } | |
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; | |
310 | ||
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; | |
330 | ||
331 | default: | |
cebadc5c | 332 | printk(KERN_ERR "PPA: bug in ppa_out()\n"); |
1da177e4 LT |
333 | r = 0; |
334 | } | |
335 | return r; | |
336 | } | |
337 | ||
338 | static int ppa_in(ppa_struct *dev, char *buffer, int len) | |
339 | { | |
340 | int r; | |
341 | unsigned short ppb = dev->base; | |
342 | ||
343 | r = ppa_wait(dev); | |
344 | ||
345 | if ((r & 0x50) != 0x50) { | |
346 | ppa_fail(dev, DID_ERROR); | |
347 | return 0; | |
348 | } | |
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; | |
355 | ||
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; | |
363 | ||
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; | |
383 | ||
384 | default: | |
cebadc5c | 385 | printk(KERN_ERR "PPA: bug in ppa_ins()\n"); |
1da177e4 LT |
386 | r = 0; |
387 | break; | |
388 | } | |
389 | return r; | |
390 | } | |
391 | ||
392 | /* end of ppa_io.h */ | |
393 | static inline void ppa_d_pulse(unsigned short ppb, unsigned char b) | |
394 | { | |
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); | |
401 | } | |
402 | ||
403 | static void ppa_disconnect(ppa_struct *dev) | |
404 | { | |
405 | unsigned short ppb = dev->base; | |
406 | ||
407 | ppa_d_pulse(ppb, 0); | |
408 | ppa_d_pulse(ppb, 0x3c); | |
409 | ppa_d_pulse(ppb, 0x20); | |
410 | ppa_d_pulse(ppb, 0xf); | |
411 | } | |
412 | ||
413 | static inline void ppa_c_pulse(unsigned short ppb, unsigned char b) | |
414 | { | |
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); | |
420 | } | |
421 | ||
422 | static inline void ppa_connect(ppa_struct *dev, int flag) | |
423 | { | |
424 | unsigned short ppb = dev->base; | |
425 | ||
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); | |
433 | } | |
434 | ||
435 | static int ppa_select(ppa_struct *dev, int target) | |
436 | { | |
437 | int k; | |
438 | unsigned short ppb = dev->base; | |
439 | ||
440 | /* | |
441 | * Bit 6 (0x40) is the device selected bit. | |
442 | * First we must wait till the current device goes off line... | |
443 | */ | |
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; | |
451 | ||
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); | |
457 | ||
458 | k = PPA_SELECT_TMO; | |
459 | do { | |
460 | k--; | |
461 | udelay(1); | |
462 | } | |
463 | while (!(r_str(ppb) & 0x40) && (k)); | |
464 | if (!k) | |
465 | return 0; | |
466 | ||
467 | return 1; | |
468 | } | |
469 | ||
470 | /* | |
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. | |
474 | * | |
475 | * The return value from this function is just a hint about where the | |
476 | * handshaking failed. | |
477 | * | |
478 | */ | |
479 | static int ppa_init(ppa_struct *dev) | |
480 | { | |
481 | int retv; | |
482 | unsigned short ppb = dev->base; | |
483 | ||
484 | ppa_disconnect(dev); | |
485 | ppa_connect(dev, CONNECT_NORMAL); | |
486 | ||
487 | retv = 2; /* Failed */ | |
488 | ||
489 | w_ctr(ppb, 0xe); | |
490 | if ((r_str(ppb) & 0x08) == 0x08) | |
491 | retv--; | |
492 | ||
493 | w_ctr(ppb, 0xc); | |
494 | if ((r_str(ppb) & 0x08) == 0x00) | |
495 | retv--; | |
496 | ||
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 */ | |
502 | ||
503 | if (retv) | |
504 | return -EIO; | |
505 | ||
506 | return device_check(dev); | |
507 | } | |
508 | ||
509 | static inline int ppa_send_command(struct scsi_cmnd *cmd) | |
510 | { | |
511 | ppa_struct *dev = ppa_dev(cmd->device->host); | |
512 | int k; | |
513 | ||
514 | w_ctr(dev->base, 0x0c); | |
515 | ||
516 | for (k = 0; k < cmd->cmd_len; k++) | |
517 | if (!ppa_out(dev, &cmd->cmnd[k], 1)) | |
518 | return 0; | |
519 | return 1; | |
520 | } | |
521 | ||
522 | /* | |
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. | |
526 | * | |
527 | * The driver appears to remain stable if we speed up the parallel port | |
528 | * i/o in this function, but not elsewhere. | |
529 | */ | |
530 | static int ppa_completion(struct scsi_cmnd *cmd) | |
531 | { | |
532 | /* Return codes: | |
533 | * -1 Error | |
534 | * 0 Told to schedule | |
535 | * 1 Finished data transfer | |
536 | */ | |
537 | ppa_struct *dev = ppa_dev(cmd->device->host); | |
538 | unsigned short ppb = dev->base; | |
539 | unsigned long start_jiffies = jiffies; | |
540 | ||
541 | unsigned char r, v; | |
542 | int fast, bulk, status; | |
543 | ||
544 | v = cmd->cmnd[0]; | |
545 | bulk = ((v == READ_6) || | |
546 | (v == READ_10) || (v == WRITE_6) || (v == WRITE_10)); | |
547 | ||
548 | /* | |
549 | * We only get here if the drive is ready to comunicate, | |
550 | * hence no need for a full ppa_wait. | |
551 | */ | |
552 | r = (r_str(ppb) & 0xf0); | |
553 | ||
554 | while (r != (unsigned char) 0xf0) { | |
555 | /* | |
556 | * If we have been running for more than a full timer tick | |
557 | * then take a rest. | |
558 | */ | |
559 | if (time_after(jiffies, start_jiffies + 1)) | |
560 | return 0; | |
561 | ||
562 | if ((cmd->SCp.this_residual <= 0)) { | |
563 | ppa_fail(dev, DID_ERROR); | |
564 | return -1; /* ERROR_RETURN */ | |
565 | } | |
566 | ||
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. | |
576 | */ | |
577 | if ((r & 0xc0) != 0xc0) { | |
578 | /* Wait for reconnection should be no more than | |
579 | * jiffy/2 = 5ms = 5000 loops | |
580 | */ | |
581 | unsigned long k = dev->recon_tmo; | |
582 | for (; k && ((r = (r_str(ppb) & 0xf0)) & 0xc0) != 0xc0; | |
583 | k--) | |
584 | udelay(1); | |
585 | ||
586 | if (!k) | |
587 | return 0; | |
588 | } | |
589 | ||
590 | /* determine if we should use burst I/O */ | |
591 | fast = (bulk && (cmd->SCp.this_residual >= PPA_BURST_SIZE)) | |
592 | ? PPA_BURST_SIZE : 1; | |
593 | ||
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); | |
598 | ||
599 | cmd->SCp.ptr += fast; | |
600 | cmd->SCp.this_residual -= fast; | |
601 | ||
602 | if (!status) { | |
603 | ppa_fail(dev, DID_BUS_BUSY); | |
604 | return -1; /* ERROR_RETURN */ | |
605 | } | |
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; | |
45711f1a | 612 | cmd->SCp.ptr = sg_virt(cmd->SCp.buffer); |
1da177e4 LT |
613 | } |
614 | } | |
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; | |
620 | } | |
621 | return 1; /* FINISH_RETURN */ | |
622 | } | |
623 | ||
624 | /* | |
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. | |
628 | */ | |
c4028958 | 629 | static void ppa_interrupt(struct work_struct *work) |
1da177e4 | 630 | { |
c4028958 | 631 | ppa_struct *dev = container_of(work, ppa_struct, ppa_tq.work); |
1da177e4 LT |
632 | struct scsi_cmnd *cmd = dev->cur_cmd; |
633 | ||
634 | if (!cmd) { | |
cebadc5c | 635 | printk(KERN_ERR "PPA: bug in ppa_interrupt\n"); |
1da177e4 LT |
636 | return; |
637 | } | |
638 | if (ppa_engine(dev, cmd)) { | |
1da177e4 LT |
639 | schedule_delayed_work(&dev->ppa_tq, 1); |
640 | return; | |
641 | } | |
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: | |
cebadc5c | 648 | printk(KERN_DEBUG "ppa: no device at SCSI ID %i\n", cmd->device->target); |
1da177e4 LT |
649 | break; |
650 | case DID_BUS_BUSY: | |
cebadc5c | 651 | printk(KERN_DEBUG "ppa: BUS BUSY - EPP timeout detected\n"); |
1da177e4 LT |
652 | break; |
653 | case DID_TIME_OUT: | |
cebadc5c | 654 | printk(KERN_DEBUG "ppa: unknown timeout\n"); |
1da177e4 LT |
655 | break; |
656 | case DID_ABORT: | |
cebadc5c | 657 | printk(KERN_DEBUG "ppa: told to abort\n"); |
1da177e4 LT |
658 | break; |
659 | case DID_PARITY: | |
cebadc5c | 660 | printk(KERN_DEBUG "ppa: parity error (???)\n"); |
1da177e4 LT |
661 | break; |
662 | case DID_ERROR: | |
cebadc5c | 663 | printk(KERN_DEBUG "ppa: internal driver error\n"); |
1da177e4 LT |
664 | break; |
665 | case DID_RESET: | |
cebadc5c | 666 | printk(KERN_DEBUG "ppa: told to reset device\n"); |
1da177e4 LT |
667 | break; |
668 | case DID_BAD_INTR: | |
cebadc5c | 669 | printk(KERN_WARNING "ppa: bad interrupt (???)\n"); |
1da177e4 LT |
670 | break; |
671 | default: | |
cebadc5c | 672 | printk(KERN_WARNING "ppa: bad return code (%02x)\n", |
1da177e4 LT |
673 | (cmd->result >> 16) & 0xff); |
674 | } | |
675 | #endif | |
676 | ||
677 | if (cmd->SCp.phase > 1) | |
678 | ppa_disconnect(dev); | |
679 | ||
680 | ppa_pb_dismiss(dev); | |
681 | ||
682 | dev->cur_cmd = NULL; | |
683 | ||
684 | cmd->scsi_done(cmd); | |
685 | } | |
686 | ||
687 | static int ppa_engine(ppa_struct *dev, struct scsi_cmnd *cmd) | |
688 | { | |
689 | unsigned short ppb = dev->base; | |
690 | unsigned char l = 0, h = 0; | |
691 | int retv; | |
692 | ||
693 | /* First check for any errors that may of occurred | |
694 | * Here we check for internal errors | |
695 | */ | |
696 | if (dev->failed) | |
697 | return 0; | |
698 | ||
699 | switch (cmd->SCp.phase) { | |
700 | case 0: /* Phase 0 - Waiting for parport */ | |
701 | if (time_after(jiffies, dev->jstart + HZ)) { | |
702 | /* | |
703 | * We waited more than a second | |
704 | * for parport to call us | |
705 | */ | |
706 | ppa_fail(dev, DID_BUS_BUSY); | |
707 | return 0; | |
708 | } | |
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 */ | |
713 | ||
714 | ppa_connect(dev, CONNECT_EPP_MAYBE); | |
715 | ||
716 | w_ctr(ppb, 0xe); | |
717 | if ((r_str(ppb) & 0x08) == 0x08) | |
718 | retv--; | |
719 | ||
720 | w_ctr(ppb, 0xc); | |
721 | if ((r_str(ppb) & 0x08) == 0x00) | |
722 | retv--; | |
723 | ||
724 | if (retv) { | |
60c904ae | 725 | if (time_after(jiffies, dev->jstart + (1 * HZ))) { |
cebadc5c | 726 | printk(KERN_ERR "ppa: Parallel port cable is unplugged.\n"); |
1da177e4 LT |
727 | ppa_fail(dev, DID_BUS_BUSY); |
728 | return 0; | |
729 | } else { | |
730 | ppa_disconnect(dev); | |
731 | return 1; /* Try again in a jiffy */ | |
732 | } | |
733 | } | |
734 | cmd->SCp.phase++; | |
735 | } | |
736 | ||
737 | case 2: /* Phase 2 - We are now talking to the scsi bus */ | |
422c0d61 | 738 | if (!ppa_select(dev, scmd_id(cmd))) { |
1da177e4 LT |
739 | ppa_fail(dev, DID_NO_CONNECT); |
740 | return 0; | |
741 | } | |
742 | cmd->SCp.phase++; | |
743 | ||
744 | case 3: /* Phase 3 - Ready to accept a command */ | |
745 | w_ctr(ppb, 0x0c); | |
746 | if (!(r_str(ppb) & 0x80)) | |
747 | return 1; | |
748 | ||
749 | if (!ppa_send_command(cmd)) | |
750 | return 0; | |
751 | cmd->SCp.phase++; | |
752 | ||
753 | case 4: /* Phase 4 - Setup scatter/gather buffers */ | |
57643c71 BH |
754 | if (scsi_bufflen(cmd)) { |
755 | cmd->SCp.buffer = scsi_sglist(cmd); | |
1da177e4 | 756 | cmd->SCp.this_residual = cmd->SCp.buffer->length; |
45711f1a | 757 | cmd->SCp.ptr = sg_virt(cmd->SCp.buffer); |
1da177e4 | 758 | } else { |
1da177e4 | 759 | cmd->SCp.buffer = NULL; |
57643c71 BH |
760 | cmd->SCp.this_residual = 0; |
761 | cmd->SCp.ptr = NULL; | |
1da177e4 | 762 | } |
57643c71 | 763 | cmd->SCp.buffers_residual = scsi_sg_count(cmd) - 1; |
1da177e4 LT |
764 | cmd->SCp.phase++; |
765 | ||
766 | case 5: /* Phase 5 - Data transfer stage */ | |
767 | w_ctr(ppb, 0x0c); | |
768 | if (!(r_str(ppb) & 0x80)) | |
769 | return 1; | |
770 | ||
771 | retv = ppa_completion(cmd); | |
772 | if (retv == -1) | |
773 | return 0; | |
774 | if (retv == 0) | |
775 | return 1; | |
776 | cmd->SCp.phase++; | |
777 | ||
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; | |
784 | } | |
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); | |
791 | } | |
792 | return 0; /* Finished */ | |
793 | break; | |
794 | ||
795 | default: | |
cebadc5c | 796 | printk(KERN_ERR "ppa: Invalid scsi phase\n"); |
1da177e4 LT |
797 | } |
798 | return 0; | |
799 | } | |
800 | ||
f281233d | 801 | static int ppa_queuecommand_lck(struct scsi_cmnd *cmd, |
1da177e4 LT |
802 | void (*done) (struct scsi_cmnd *)) |
803 | { | |
804 | ppa_struct *dev = ppa_dev(cmd->device->host); | |
805 | ||
806 | if (dev->cur_cmd) { | |
cebadc5c | 807 | printk(KERN_ERR "PPA: bug in ppa_queuecommand\n"); |
1da177e4 LT |
808 | return 0; |
809 | } | |
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 */ | |
816 | ||
c4028958 | 817 | schedule_delayed_work(&dev->ppa_tq, 0); |
1da177e4 LT |
818 | |
819 | ppa_pb_claim(dev); | |
820 | ||
821 | return 0; | |
822 | } | |
823 | ||
f281233d JG |
824 | static DEF_SCSI_QCMD(ppa_queuecommand) |
825 | ||
1da177e4 LT |
826 | /* |
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. | |
831 | */ | |
832 | static int ppa_biosparam(struct scsi_device *sdev, struct block_device *dev, | |
833 | sector_t capacity, int ip[]) | |
834 | { | |
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; | |
844 | } | |
845 | return 0; | |
846 | } | |
847 | ||
848 | static int ppa_abort(struct scsi_cmnd *cmd) | |
849 | { | |
850 | ppa_struct *dev = ppa_dev(cmd->device->host); | |
851 | /* | |
852 | * There is no method for aborting commands since Iomega | |
853 | * have tied the SCSI_MESSAGE line high in the interface | |
854 | */ | |
855 | ||
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; | |
865 | } | |
866 | } | |
867 | ||
868 | static void ppa_reset_pulse(unsigned int base) | |
869 | { | |
870 | w_dtr(base, 0x40); | |
871 | w_ctr(base, 0x8); | |
872 | udelay(30); | |
873 | w_ctr(base, 0xc); | |
874 | } | |
875 | ||
876 | static int ppa_reset(struct scsi_cmnd *cmd) | |
877 | { | |
878 | ppa_struct *dev = ppa_dev(cmd->device->host); | |
879 | ||
880 | if (cmd->SCp.phase) | |
881 | ppa_disconnect(dev); | |
882 | dev->cur_cmd = NULL; /* Forget the problem */ | |
883 | ||
884 | ppa_connect(dev, CONNECT_NORMAL); | |
885 | ppa_reset_pulse(dev->base); | |
68b3aa7c | 886 | mdelay(1); /* device settle delay */ |
1da177e4 | 887 | ppa_disconnect(dev); |
68b3aa7c | 888 | mdelay(1); /* device settle delay */ |
1da177e4 LT |
889 | return SUCCESS; |
890 | } | |
891 | ||
892 | static int device_check(ppa_struct *dev) | |
893 | { | |
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. */ | |
896 | ||
cebadc5c | 897 | static u8 cmd[6] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }; |
1da177e4 LT |
898 | int loop, old_mode, status, k, ppb = dev->base; |
899 | unsigned char l; | |
900 | ||
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; | |
906 | ||
cebadc5c | 907 | second_pass: |
1da177e4 LT |
908 | ppa_connect(dev, CONNECT_EPP_MAYBE); |
909 | /* Select SCSI device */ | |
910 | if (!ppa_select(dev, loop)) { | |
911 | ppa_disconnect(dev); | |
912 | continue; | |
913 | } | |
cebadc5c | 914 | printk(KERN_INFO "ppa: Found device at ID %i, Attempting to use %s\n", |
1da177e4 LT |
915 | loop, PPA_MODE_STRING[dev->mode]); |
916 | ||
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); | |
922 | ||
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; | |
936 | } | |
937 | return -EIO; | |
938 | } | |
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)); | |
946 | ||
947 | l &= 0xf0; | |
948 | ||
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; | |
959 | } | |
960 | return -EIO; | |
961 | } | |
962 | ppa_disconnect(dev); | |
cebadc5c | 963 | printk(KERN_INFO "ppa: Communication established with ID %i using %s\n", |
1da177e4 LT |
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; | |
971 | } | |
972 | return -ENODEV; | |
973 | } | |
974 | ||
78a904b6 RD |
975 | static int ppa_adjust_queue(struct scsi_device *device) |
976 | { | |
977 | blk_queue_bounce_limit(device->request_queue, BLK_BOUNCE_HIGH); | |
978 | return 0; | |
979 | } | |
980 | ||
1da177e4 LT |
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, | |
78a904b6 | 996 | .slave_alloc = ppa_adjust_queue, |
1da177e4 LT |
997 | }; |
998 | ||
999 | /*************************************************************************** | |
1000 | * Parallel port probing routines * | |
1001 | ***************************************************************************/ | |
1002 | ||
1003 | static LIST_HEAD(ppa_hosts); | |
1004 | ||
1005 | static int __ppa_attach(struct parport *pb) | |
1006 | { | |
1007 | struct Scsi_Host *host; | |
7259f0d0 | 1008 | DECLARE_WAIT_QUEUE_HEAD_ONSTACK(waiting); |
1da177e4 LT |
1009 | DEFINE_WAIT(wait); |
1010 | ppa_struct *dev; | |
1011 | int ports; | |
1012 | int modes, ppb, ppb_hi; | |
1013 | int err = -ENOMEM; | |
1014 | ||
dd00cc48 | 1015 | dev = kzalloc(sizeof(ppa_struct), GFP_KERNEL); |
1da177e4 LT |
1016 | if (!dev) |
1017 | return -ENOMEM; | |
1da177e4 LT |
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); | |
1024 | ||
1025 | if (!dev->dev) | |
1026 | goto out; | |
1027 | ||
1028 | /* Claim the bus so it remembers what we do to the control | |
1029 | * registers. [ CTR and ECP ] | |
1030 | */ | |
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; | |
1044 | } | |
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; | |
1051 | ||
1052 | /* Mode detection works up the chain of speed | |
1053 | * This avoids a nasty if-then-else-if-... tree | |
1054 | */ | |
1055 | dev->mode = PPA_NIBBLE; | |
1056 | ||
1057 | if (modes & PARPORT_MODE_TRISTATE) | |
1058 | dev->mode = PPA_PS2; | |
1059 | ||
1060 | if (modes & PARPORT_MODE_ECP) { | |
1061 | w_ecr(ppb_hi, 0x20); | |
1062 | dev->mode = PPA_PS2; | |
1063 | } | |
1064 | if ((modes & PARPORT_MODE_EPP) && (modes & PARPORT_MODE_ECP)) | |
1065 | w_ecr(ppb_hi, 0x80); | |
1066 | ||
1067 | /* Done configuration */ | |
1068 | ||
1069 | err = ppa_init(dev); | |
1070 | ppa_pb_release(dev); | |
1071 | ||
1072 | if (err) | |
1073 | goto out1; | |
1074 | ||
1075 | /* now the glue ... */ | |
1076 | if (dev->mode == PPA_NIBBLE || dev->mode == PPA_PS2) | |
1077 | ports = 3; | |
1078 | else | |
1079 | ports = 8; | |
1080 | ||
c4028958 | 1081 | INIT_DELAYED_WORK(&dev->ppa_tq, ppa_interrupt); |
1da177e4 LT |
1082 | |
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; | |
1107 | } | |
1108 | ||
1109 | static void ppa_attach(struct parport *pb) | |
1110 | { | |
1111 | __ppa_attach(pb); | |
1112 | } | |
1113 | ||
1114 | static void ppa_detach(struct parport *pb) | |
1115 | { | |
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; | |
1125 | } | |
1126 | } | |
1127 | } | |
1128 | ||
1129 | static struct parport_driver ppa_driver = { | |
1130 | .name = "ppa", | |
1131 | .attach = ppa_attach, | |
1132 | .detach = ppa_detach, | |
1133 | }; | |
1134 | ||
1135 | static int __init ppa_driver_init(void) | |
1136 | { | |
cebadc5c | 1137 | printk(KERN_INFO "ppa: Version %s\n", PPA_VERSION); |
1da177e4 LT |
1138 | return parport_register_driver(&ppa_driver); |
1139 | } | |
1140 | ||
1141 | static void __exit ppa_driver_exit(void) | |
1142 | { | |
1143 | parport_unregister_driver(&ppa_driver); | |
1144 | } | |
1145 | ||
1146 | module_init(ppa_driver_init); | |
1147 | module_exit(ppa_driver_exit); | |
1148 | MODULE_LICENSE("GPL"); |