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 | ||
b7654914 | 121 | static inline int ppa_write_info(struct Scsi_Host *host, char *buffer, int length) |
1da177e4 | 122 | { |
b7654914 | 123 | ppa_struct *dev = ppa_dev(host); |
1da177e4 LT |
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; | |
cebadc5c | 134 | printk(KERN_INFO "ppa: recon_tmo set to %ld\n", x); |
1da177e4 LT |
135 | return length; |
136 | } | |
cebadc5c AC |
137 | printk(KERN_WARNING "ppa /proc: invalid variable\n"); |
138 | return -EINVAL; | |
1da177e4 LT |
139 | } |
140 | ||
b7654914 | 141 | static int ppa_show_info(struct seq_file *m, struct Scsi_Host *host) |
1da177e4 | 142 | { |
1da177e4 LT |
143 | ppa_struct *dev = ppa_dev(host); |
144 | ||
b7654914 AV |
145 | seq_printf(m, "Version : %s\n", PPA_VERSION); |
146 | seq_printf(m, "Parport : %s\n", dev->dev->port->name); | |
147 | seq_printf(m, "Mode : %s\n", PPA_MODE_STRING[dev->mode]); | |
1da177e4 | 148 | #if PPA_DEBUG > 0 |
b7654914 | 149 | seq_printf(m, "recon_tmo : %lu\n", dev->recon_tmo); |
1da177e4 | 150 | #endif |
b7654914 | 151 | return 0; |
1da177e4 LT |
152 | } |
153 | ||
154 | static int device_check(ppa_struct *dev); | |
155 | ||
156 | #if PPA_DEBUG > 0 | |
157 | #define ppa_fail(x,y) printk("ppa: ppa_fail(%i) from %s at line %d\n",\ | |
cadbd4a5 | 158 | y, __func__, __LINE__); ppa_fail_func(x,y); |
1da177e4 LT |
159 | static inline void ppa_fail_func(ppa_struct *dev, int error_code) |
160 | #else | |
161 | static inline void ppa_fail(ppa_struct *dev, int error_code) | |
162 | #endif | |
163 | { | |
164 | /* If we fail a device then we trash status / message bytes */ | |
165 | if (dev->cur_cmd) { | |
166 | dev->cur_cmd->result = error_code << 16; | |
167 | dev->failed = 1; | |
168 | } | |
169 | } | |
170 | ||
171 | /* | |
172 | * Wait for the high bit to be set. | |
173 | * | |
174 | * In principle, this could be tied to an interrupt, but the adapter | |
175 | * doesn't appear to be designed to support interrupts. We spin on | |
176 | * the 0x80 ready bit. | |
177 | */ | |
178 | static unsigned char ppa_wait(ppa_struct *dev) | |
179 | { | |
180 | int k; | |
181 | unsigned short ppb = dev->base; | |
182 | unsigned char r; | |
183 | ||
184 | k = PPA_SPIN_TMO; | |
185 | /* Wait for bit 6 and 7 - PJC */ | |
186 | for (r = r_str(ppb); ((r & 0xc0) != 0xc0) && (k); k--) { | |
187 | udelay(1); | |
188 | r = r_str(ppb); | |
189 | } | |
190 | ||
191 | /* | |
192 | * return some status information. | |
193 | * Semantics: 0xc0 = ZIP wants more data | |
194 | * 0xd0 = ZIP wants to send more data | |
195 | * 0xe0 = ZIP is expecting SCSI command data | |
196 | * 0xf0 = end of transfer, ZIP is sending status | |
197 | */ | |
198 | if (k) | |
199 | return (r & 0xf0); | |
200 | ||
201 | /* Counter expired - Time out occurred */ | |
202 | ppa_fail(dev, DID_TIME_OUT); | |
cebadc5c | 203 | printk(KERN_WARNING "ppa timeout in ppa_wait\n"); |
1da177e4 LT |
204 | return 0; /* command timed out */ |
205 | } | |
206 | ||
207 | /* | |
208 | * Clear EPP Timeout Bit | |
209 | */ | |
210 | static inline void epp_reset(unsigned short ppb) | |
211 | { | |
212 | int i; | |
213 | ||
214 | i = r_str(ppb); | |
215 | w_str(ppb, i); | |
216 | w_str(ppb, i & 0xfe); | |
217 | } | |
218 | ||
219 | /* | |
220 | * Wait for empty ECP fifo (if we are in ECP fifo mode only) | |
221 | */ | |
222 | static inline void ecp_sync(ppa_struct *dev) | |
223 | { | |
224 | int i, ppb_hi = dev->dev->port->base_hi; | |
225 | ||
226 | if (ppb_hi == 0) | |
227 | return; | |
228 | ||
229 | if ((r_ecr(ppb_hi) & 0xe0) == 0x60) { /* mode 011 == ECP fifo mode */ | |
230 | for (i = 0; i < 100; i++) { | |
231 | if (r_ecr(ppb_hi) & 0x01) | |
232 | return; | |
233 | udelay(5); | |
234 | } | |
cebadc5c | 235 | printk(KERN_WARNING "ppa: ECP sync failed as data still present in FIFO.\n"); |
1da177e4 LT |
236 | } |
237 | } | |
238 | ||
239 | static int ppa_byte_out(unsigned short base, const char *buffer, int len) | |
240 | { | |
241 | int i; | |
242 | ||
243 | for (i = len; i; i--) { | |
244 | w_dtr(base, *buffer++); | |
245 | w_ctr(base, 0xe); | |
246 | w_ctr(base, 0xc); | |
247 | } | |
248 | return 1; /* All went well - we hope! */ | |
249 | } | |
250 | ||
251 | static int ppa_byte_in(unsigned short base, char *buffer, int len) | |
252 | { | |
253 | int i; | |
254 | ||
255 | for (i = len; i; i--) { | |
256 | *buffer++ = r_dtr(base); | |
257 | w_ctr(base, 0x27); | |
258 | w_ctr(base, 0x25); | |
259 | } | |
260 | return 1; /* All went well - we hope! */ | |
261 | } | |
262 | ||
263 | static int ppa_nibble_in(unsigned short base, char *buffer, int len) | |
264 | { | |
265 | for (; len; len--) { | |
266 | unsigned char h; | |
267 | ||
268 | w_ctr(base, 0x4); | |
269 | h = r_str(base) & 0xf0; | |
270 | w_ctr(base, 0x6); | |
271 | *buffer++ = h | ((r_str(base) & 0xf0) >> 4); | |
272 | } | |
273 | return 1; /* All went well - we hope! */ | |
274 | } | |
275 | ||
276 | static int ppa_out(ppa_struct *dev, char *buffer, int len) | |
277 | { | |
278 | int r; | |
279 | unsigned short ppb = dev->base; | |
280 | ||
281 | r = ppa_wait(dev); | |
282 | ||
283 | if ((r & 0x50) != 0x40) { | |
284 | ppa_fail(dev, DID_ERROR); | |
285 | return 0; | |
286 | } | |
287 | switch (dev->mode) { | |
288 | case PPA_NIBBLE: | |
289 | case PPA_PS2: | |
290 | /* 8 bit output, with a loop */ | |
291 | r = ppa_byte_out(ppb, buffer, len); | |
292 | break; | |
293 | ||
294 | case PPA_EPP_32: | |
295 | case PPA_EPP_16: | |
296 | case PPA_EPP_8: | |
297 | epp_reset(ppb); | |
298 | w_ctr(ppb, 0x4); | |
299 | #ifdef CONFIG_SCSI_IZIP_EPP16 | |
300 | if (!(((long) buffer | len) & 0x01)) | |
301 | outsw(ppb + 4, buffer, len >> 1); | |
302 | #else | |
303 | if (!(((long) buffer | len) & 0x03)) | |
304 | outsl(ppb + 4, buffer, len >> 2); | |
305 | #endif | |
306 | else | |
307 | outsb(ppb + 4, buffer, len); | |
308 | w_ctr(ppb, 0xc); | |
309 | r = !(r_str(ppb) & 0x01); | |
310 | w_ctr(ppb, 0xc); | |
311 | ecp_sync(dev); | |
312 | break; | |
313 | ||
314 | default: | |
cebadc5c | 315 | printk(KERN_ERR "PPA: bug in ppa_out()\n"); |
1da177e4 LT |
316 | r = 0; |
317 | } | |
318 | return r; | |
319 | } | |
320 | ||
321 | static int ppa_in(ppa_struct *dev, char *buffer, int len) | |
322 | { | |
323 | int r; | |
324 | unsigned short ppb = dev->base; | |
325 | ||
326 | r = ppa_wait(dev); | |
327 | ||
328 | if ((r & 0x50) != 0x50) { | |
329 | ppa_fail(dev, DID_ERROR); | |
330 | return 0; | |
331 | } | |
332 | switch (dev->mode) { | |
333 | case PPA_NIBBLE: | |
334 | /* 4 bit input, with a loop */ | |
335 | r = ppa_nibble_in(ppb, buffer, len); | |
336 | w_ctr(ppb, 0xc); | |
337 | break; | |
338 | ||
339 | case PPA_PS2: | |
340 | /* 8 bit input, with a loop */ | |
341 | w_ctr(ppb, 0x25); | |
342 | r = ppa_byte_in(ppb, buffer, len); | |
343 | w_ctr(ppb, 0x4); | |
344 | w_ctr(ppb, 0xc); | |
345 | break; | |
346 | ||
347 | case PPA_EPP_32: | |
348 | case PPA_EPP_16: | |
349 | case PPA_EPP_8: | |
350 | epp_reset(ppb); | |
351 | w_ctr(ppb, 0x24); | |
352 | #ifdef CONFIG_SCSI_IZIP_EPP16 | |
353 | if (!(((long) buffer | len) & 0x01)) | |
354 | insw(ppb + 4, buffer, len >> 1); | |
355 | #else | |
356 | if (!(((long) buffer | len) & 0x03)) | |
357 | insl(ppb + 4, buffer, len >> 2); | |
358 | #endif | |
359 | else | |
360 | insb(ppb + 4, buffer, len); | |
361 | w_ctr(ppb, 0x2c); | |
362 | r = !(r_str(ppb) & 0x01); | |
363 | w_ctr(ppb, 0x2c); | |
364 | ecp_sync(dev); | |
365 | break; | |
366 | ||
367 | default: | |
cebadc5c | 368 | printk(KERN_ERR "PPA: bug in ppa_ins()\n"); |
1da177e4 LT |
369 | r = 0; |
370 | break; | |
371 | } | |
372 | return r; | |
373 | } | |
374 | ||
375 | /* end of ppa_io.h */ | |
376 | static inline void ppa_d_pulse(unsigned short ppb, unsigned char b) | |
377 | { | |
378 | w_dtr(ppb, b); | |
379 | w_ctr(ppb, 0xc); | |
380 | w_ctr(ppb, 0xe); | |
381 | w_ctr(ppb, 0xc); | |
382 | w_ctr(ppb, 0x4); | |
383 | w_ctr(ppb, 0xc); | |
384 | } | |
385 | ||
386 | static void ppa_disconnect(ppa_struct *dev) | |
387 | { | |
388 | unsigned short ppb = dev->base; | |
389 | ||
390 | ppa_d_pulse(ppb, 0); | |
391 | ppa_d_pulse(ppb, 0x3c); | |
392 | ppa_d_pulse(ppb, 0x20); | |
393 | ppa_d_pulse(ppb, 0xf); | |
394 | } | |
395 | ||
396 | static inline void ppa_c_pulse(unsigned short ppb, unsigned char b) | |
397 | { | |
398 | w_dtr(ppb, b); | |
399 | w_ctr(ppb, 0x4); | |
400 | w_ctr(ppb, 0x6); | |
401 | w_ctr(ppb, 0x4); | |
402 | w_ctr(ppb, 0xc); | |
403 | } | |
404 | ||
405 | static inline void ppa_connect(ppa_struct *dev, int flag) | |
406 | { | |
407 | unsigned short ppb = dev->base; | |
408 | ||
409 | ppa_c_pulse(ppb, 0); | |
410 | ppa_c_pulse(ppb, 0x3c); | |
411 | ppa_c_pulse(ppb, 0x20); | |
412 | if ((flag == CONNECT_EPP_MAYBE) && IN_EPP_MODE(dev->mode)) | |
413 | ppa_c_pulse(ppb, 0xcf); | |
414 | else | |
415 | ppa_c_pulse(ppb, 0x8f); | |
416 | } | |
417 | ||
418 | static int ppa_select(ppa_struct *dev, int target) | |
419 | { | |
420 | int k; | |
421 | unsigned short ppb = dev->base; | |
422 | ||
423 | /* | |
424 | * Bit 6 (0x40) is the device selected bit. | |
425 | * First we must wait till the current device goes off line... | |
426 | */ | |
427 | k = PPA_SELECT_TMO; | |
428 | do { | |
429 | k--; | |
430 | udelay(1); | |
431 | } while ((r_str(ppb) & 0x40) && (k)); | |
432 | if (!k) | |
433 | return 0; | |
434 | ||
435 | w_dtr(ppb, (1 << target)); | |
436 | w_ctr(ppb, 0xe); | |
437 | w_ctr(ppb, 0xc); | |
438 | w_dtr(ppb, 0x80); /* This is NOT the initator */ | |
439 | w_ctr(ppb, 0x8); | |
440 | ||
441 | k = PPA_SELECT_TMO; | |
442 | do { | |
443 | k--; | |
444 | udelay(1); | |
445 | } | |
446 | while (!(r_str(ppb) & 0x40) && (k)); | |
447 | if (!k) | |
448 | return 0; | |
449 | ||
450 | return 1; | |
451 | } | |
452 | ||
453 | /* | |
454 | * This is based on a trace of what the Iomega DOS 'guest' driver does. | |
455 | * I've tried several different kinds of parallel ports with guest and | |
456 | * coded this to react in the same ways that it does. | |
457 | * | |
458 | * The return value from this function is just a hint about where the | |
459 | * handshaking failed. | |
460 | * | |
461 | */ | |
462 | static int ppa_init(ppa_struct *dev) | |
463 | { | |
464 | int retv; | |
465 | unsigned short ppb = dev->base; | |
466 | ||
467 | ppa_disconnect(dev); | |
468 | ppa_connect(dev, CONNECT_NORMAL); | |
469 | ||
470 | retv = 2; /* Failed */ | |
471 | ||
472 | w_ctr(ppb, 0xe); | |
473 | if ((r_str(ppb) & 0x08) == 0x08) | |
474 | retv--; | |
475 | ||
476 | w_ctr(ppb, 0xc); | |
477 | if ((r_str(ppb) & 0x08) == 0x00) | |
478 | retv--; | |
479 | ||
480 | if (!retv) | |
481 | ppa_reset_pulse(ppb); | |
482 | udelay(1000); /* Allow devices to settle down */ | |
483 | ppa_disconnect(dev); | |
484 | udelay(1000); /* Another delay to allow devices to settle */ | |
485 | ||
486 | if (retv) | |
487 | return -EIO; | |
488 | ||
489 | return device_check(dev); | |
490 | } | |
491 | ||
492 | static inline int ppa_send_command(struct scsi_cmnd *cmd) | |
493 | { | |
494 | ppa_struct *dev = ppa_dev(cmd->device->host); | |
495 | int k; | |
496 | ||
497 | w_ctr(dev->base, 0x0c); | |
498 | ||
499 | for (k = 0; k < cmd->cmd_len; k++) | |
500 | if (!ppa_out(dev, &cmd->cmnd[k], 1)) | |
501 | return 0; | |
502 | return 1; | |
503 | } | |
504 | ||
505 | /* | |
506 | * The bulk flag enables some optimisations in the data transfer loops, | |
507 | * it should be true for any command that transfers data in integral | |
508 | * numbers of sectors. | |
509 | * | |
510 | * The driver appears to remain stable if we speed up the parallel port | |
511 | * i/o in this function, but not elsewhere. | |
512 | */ | |
513 | static int ppa_completion(struct scsi_cmnd *cmd) | |
514 | { | |
515 | /* Return codes: | |
516 | * -1 Error | |
517 | * 0 Told to schedule | |
518 | * 1 Finished data transfer | |
519 | */ | |
520 | ppa_struct *dev = ppa_dev(cmd->device->host); | |
521 | unsigned short ppb = dev->base; | |
522 | unsigned long start_jiffies = jiffies; | |
523 | ||
524 | unsigned char r, v; | |
525 | int fast, bulk, status; | |
526 | ||
527 | v = cmd->cmnd[0]; | |
528 | bulk = ((v == READ_6) || | |
529 | (v == READ_10) || (v == WRITE_6) || (v == WRITE_10)); | |
530 | ||
531 | /* | |
532 | * We only get here if the drive is ready to comunicate, | |
533 | * hence no need for a full ppa_wait. | |
534 | */ | |
535 | r = (r_str(ppb) & 0xf0); | |
536 | ||
537 | while (r != (unsigned char) 0xf0) { | |
538 | /* | |
539 | * If we have been running for more than a full timer tick | |
540 | * then take a rest. | |
541 | */ | |
542 | if (time_after(jiffies, start_jiffies + 1)) | |
543 | return 0; | |
544 | ||
545 | if ((cmd->SCp.this_residual <= 0)) { | |
546 | ppa_fail(dev, DID_ERROR); | |
547 | return -1; /* ERROR_RETURN */ | |
548 | } | |
549 | ||
550 | /* On some hardware we have SCSI disconnected (6th bit low) | |
551 | * for about 100usecs. It is too expensive to wait a | |
552 | * tick on every loop so we busy wait for no more than | |
553 | * 500usecs to give the drive a chance first. We do not | |
554 | * change things for "normal" hardware since generally | |
555 | * the 6th bit is always high. | |
556 | * This makes the CPU load higher on some hardware | |
557 | * but otherwise we can not get more than 50K/secs | |
558 | * on this problem hardware. | |
559 | */ | |
560 | if ((r & 0xc0) != 0xc0) { | |
561 | /* Wait for reconnection should be no more than | |
562 | * jiffy/2 = 5ms = 5000 loops | |
563 | */ | |
564 | unsigned long k = dev->recon_tmo; | |
565 | for (; k && ((r = (r_str(ppb) & 0xf0)) & 0xc0) != 0xc0; | |
566 | k--) | |
567 | udelay(1); | |
568 | ||
569 | if (!k) | |
570 | return 0; | |
571 | } | |
572 | ||
573 | /* determine if we should use burst I/O */ | |
574 | fast = (bulk && (cmd->SCp.this_residual >= PPA_BURST_SIZE)) | |
575 | ? PPA_BURST_SIZE : 1; | |
576 | ||
577 | if (r == (unsigned char) 0xc0) | |
578 | status = ppa_out(dev, cmd->SCp.ptr, fast); | |
579 | else | |
580 | status = ppa_in(dev, cmd->SCp.ptr, fast); | |
581 | ||
582 | cmd->SCp.ptr += fast; | |
583 | cmd->SCp.this_residual -= fast; | |
584 | ||
585 | if (!status) { | |
586 | ppa_fail(dev, DID_BUS_BUSY); | |
587 | return -1; /* ERROR_RETURN */ | |
588 | } | |
589 | if (cmd->SCp.buffer && !cmd->SCp.this_residual) { | |
590 | /* if scatter/gather, advance to the next segment */ | |
591 | if (cmd->SCp.buffers_residual--) { | |
592 | cmd->SCp.buffer++; | |
593 | cmd->SCp.this_residual = | |
594 | cmd->SCp.buffer->length; | |
45711f1a | 595 | cmd->SCp.ptr = sg_virt(cmd->SCp.buffer); |
1da177e4 LT |
596 | } |
597 | } | |
598 | /* Now check to see if the drive is ready to comunicate */ | |
599 | r = (r_str(ppb) & 0xf0); | |
600 | /* If not, drop back down to the scheduler and wait a timer tick */ | |
601 | if (!(r & 0x80)) | |
602 | return 0; | |
603 | } | |
604 | return 1; /* FINISH_RETURN */ | |
605 | } | |
606 | ||
607 | /* | |
608 | * Since the PPA itself doesn't generate interrupts, we use | |
609 | * the scheduler's task queue to generate a stream of call-backs and | |
610 | * complete the request when the drive is ready. | |
611 | */ | |
c4028958 | 612 | static void ppa_interrupt(struct work_struct *work) |
1da177e4 | 613 | { |
c4028958 | 614 | ppa_struct *dev = container_of(work, ppa_struct, ppa_tq.work); |
1da177e4 LT |
615 | struct scsi_cmnd *cmd = dev->cur_cmd; |
616 | ||
617 | if (!cmd) { | |
cebadc5c | 618 | printk(KERN_ERR "PPA: bug in ppa_interrupt\n"); |
1da177e4 LT |
619 | return; |
620 | } | |
621 | if (ppa_engine(dev, cmd)) { | |
1da177e4 LT |
622 | schedule_delayed_work(&dev->ppa_tq, 1); |
623 | return; | |
624 | } | |
625 | /* Command must of completed hence it is safe to let go... */ | |
626 | #if PPA_DEBUG > 0 | |
627 | switch ((cmd->result >> 16) & 0xff) { | |
628 | case DID_OK: | |
629 | break; | |
630 | case DID_NO_CONNECT: | |
cebadc5c | 631 | printk(KERN_DEBUG "ppa: no device at SCSI ID %i\n", cmd->device->target); |
1da177e4 LT |
632 | break; |
633 | case DID_BUS_BUSY: | |
cebadc5c | 634 | printk(KERN_DEBUG "ppa: BUS BUSY - EPP timeout detected\n"); |
1da177e4 LT |
635 | break; |
636 | case DID_TIME_OUT: | |
cebadc5c | 637 | printk(KERN_DEBUG "ppa: unknown timeout\n"); |
1da177e4 LT |
638 | break; |
639 | case DID_ABORT: | |
cebadc5c | 640 | printk(KERN_DEBUG "ppa: told to abort\n"); |
1da177e4 LT |
641 | break; |
642 | case DID_PARITY: | |
cebadc5c | 643 | printk(KERN_DEBUG "ppa: parity error (???)\n"); |
1da177e4 LT |
644 | break; |
645 | case DID_ERROR: | |
cebadc5c | 646 | printk(KERN_DEBUG "ppa: internal driver error\n"); |
1da177e4 LT |
647 | break; |
648 | case DID_RESET: | |
cebadc5c | 649 | printk(KERN_DEBUG "ppa: told to reset device\n"); |
1da177e4 LT |
650 | break; |
651 | case DID_BAD_INTR: | |
cebadc5c | 652 | printk(KERN_WARNING "ppa: bad interrupt (???)\n"); |
1da177e4 LT |
653 | break; |
654 | default: | |
cebadc5c | 655 | printk(KERN_WARNING "ppa: bad return code (%02x)\n", |
1da177e4 LT |
656 | (cmd->result >> 16) & 0xff); |
657 | } | |
658 | #endif | |
659 | ||
660 | if (cmd->SCp.phase > 1) | |
661 | ppa_disconnect(dev); | |
662 | ||
663 | ppa_pb_dismiss(dev); | |
664 | ||
665 | dev->cur_cmd = NULL; | |
666 | ||
667 | cmd->scsi_done(cmd); | |
668 | } | |
669 | ||
670 | static int ppa_engine(ppa_struct *dev, struct scsi_cmnd *cmd) | |
671 | { | |
672 | unsigned short ppb = dev->base; | |
673 | unsigned char l = 0, h = 0; | |
674 | int retv; | |
675 | ||
676 | /* First check for any errors that may of occurred | |
677 | * Here we check for internal errors | |
678 | */ | |
679 | if (dev->failed) | |
680 | return 0; | |
681 | ||
682 | switch (cmd->SCp.phase) { | |
683 | case 0: /* Phase 0 - Waiting for parport */ | |
684 | if (time_after(jiffies, dev->jstart + HZ)) { | |
685 | /* | |
686 | * We waited more than a second | |
687 | * for parport to call us | |
688 | */ | |
689 | ppa_fail(dev, DID_BUS_BUSY); | |
690 | return 0; | |
691 | } | |
692 | return 1; /* wait until ppa_wakeup claims parport */ | |
693 | case 1: /* Phase 1 - Connected */ | |
694 | { /* Perform a sanity check for cable unplugged */ | |
695 | int retv = 2; /* Failed */ | |
696 | ||
697 | ppa_connect(dev, CONNECT_EPP_MAYBE); | |
698 | ||
699 | w_ctr(ppb, 0xe); | |
700 | if ((r_str(ppb) & 0x08) == 0x08) | |
701 | retv--; | |
702 | ||
703 | w_ctr(ppb, 0xc); | |
704 | if ((r_str(ppb) & 0x08) == 0x00) | |
705 | retv--; | |
706 | ||
707 | if (retv) { | |
60c904ae | 708 | if (time_after(jiffies, dev->jstart + (1 * HZ))) { |
cebadc5c | 709 | printk(KERN_ERR "ppa: Parallel port cable is unplugged.\n"); |
1da177e4 LT |
710 | ppa_fail(dev, DID_BUS_BUSY); |
711 | return 0; | |
712 | } else { | |
713 | ppa_disconnect(dev); | |
714 | return 1; /* Try again in a jiffy */ | |
715 | } | |
716 | } | |
717 | cmd->SCp.phase++; | |
718 | } | |
719 | ||
720 | case 2: /* Phase 2 - We are now talking to the scsi bus */ | |
422c0d61 | 721 | if (!ppa_select(dev, scmd_id(cmd))) { |
1da177e4 LT |
722 | ppa_fail(dev, DID_NO_CONNECT); |
723 | return 0; | |
724 | } | |
725 | cmd->SCp.phase++; | |
726 | ||
727 | case 3: /* Phase 3 - Ready to accept a command */ | |
728 | w_ctr(ppb, 0x0c); | |
729 | if (!(r_str(ppb) & 0x80)) | |
730 | return 1; | |
731 | ||
732 | if (!ppa_send_command(cmd)) | |
733 | return 0; | |
734 | cmd->SCp.phase++; | |
735 | ||
736 | case 4: /* Phase 4 - Setup scatter/gather buffers */ | |
57643c71 BH |
737 | if (scsi_bufflen(cmd)) { |
738 | cmd->SCp.buffer = scsi_sglist(cmd); | |
1da177e4 | 739 | cmd->SCp.this_residual = cmd->SCp.buffer->length; |
45711f1a | 740 | cmd->SCp.ptr = sg_virt(cmd->SCp.buffer); |
1da177e4 | 741 | } else { |
1da177e4 | 742 | cmd->SCp.buffer = NULL; |
57643c71 BH |
743 | cmd->SCp.this_residual = 0; |
744 | cmd->SCp.ptr = NULL; | |
1da177e4 | 745 | } |
57643c71 | 746 | cmd->SCp.buffers_residual = scsi_sg_count(cmd) - 1; |
1da177e4 LT |
747 | cmd->SCp.phase++; |
748 | ||
749 | case 5: /* Phase 5 - Data transfer stage */ | |
750 | w_ctr(ppb, 0x0c); | |
751 | if (!(r_str(ppb) & 0x80)) | |
752 | return 1; | |
753 | ||
754 | retv = ppa_completion(cmd); | |
755 | if (retv == -1) | |
756 | return 0; | |
757 | if (retv == 0) | |
758 | return 1; | |
759 | cmd->SCp.phase++; | |
760 | ||
761 | case 6: /* Phase 6 - Read status/message */ | |
762 | cmd->result = DID_OK << 16; | |
763 | /* Check for data overrun */ | |
764 | if (ppa_wait(dev) != (unsigned char) 0xf0) { | |
765 | ppa_fail(dev, DID_ERROR); | |
766 | return 0; | |
767 | } | |
768 | if (ppa_in(dev, &l, 1)) { /* read status byte */ | |
769 | /* Check for optional message byte */ | |
770 | if (ppa_wait(dev) == (unsigned char) 0xf0) | |
771 | ppa_in(dev, &h, 1); | |
772 | cmd->result = | |
773 | (DID_OK << 16) + (h << 8) + (l & STATUS_MASK); | |
774 | } | |
775 | return 0; /* Finished */ | |
776 | break; | |
777 | ||
778 | default: | |
cebadc5c | 779 | printk(KERN_ERR "ppa: Invalid scsi phase\n"); |
1da177e4 LT |
780 | } |
781 | return 0; | |
782 | } | |
783 | ||
f281233d | 784 | static int ppa_queuecommand_lck(struct scsi_cmnd *cmd, |
1da177e4 LT |
785 | void (*done) (struct scsi_cmnd *)) |
786 | { | |
787 | ppa_struct *dev = ppa_dev(cmd->device->host); | |
788 | ||
789 | if (dev->cur_cmd) { | |
cebadc5c | 790 | printk(KERN_ERR "PPA: bug in ppa_queuecommand\n"); |
1da177e4 LT |
791 | return 0; |
792 | } | |
793 | dev->failed = 0; | |
794 | dev->jstart = jiffies; | |
795 | dev->cur_cmd = cmd; | |
796 | cmd->scsi_done = done; | |
797 | cmd->result = DID_ERROR << 16; /* default return code */ | |
798 | cmd->SCp.phase = 0; /* bus free */ | |
799 | ||
c4028958 | 800 | schedule_delayed_work(&dev->ppa_tq, 0); |
1da177e4 LT |
801 | |
802 | ppa_pb_claim(dev); | |
803 | ||
804 | return 0; | |
805 | } | |
806 | ||
f281233d JG |
807 | static DEF_SCSI_QCMD(ppa_queuecommand) |
808 | ||
1da177e4 LT |
809 | /* |
810 | * Apparently the disk->capacity attribute is off by 1 sector | |
811 | * for all disk drives. We add the one here, but it should really | |
812 | * be done in sd.c. Even if it gets fixed there, this will still | |
813 | * work. | |
814 | */ | |
815 | static int ppa_biosparam(struct scsi_device *sdev, struct block_device *dev, | |
816 | sector_t capacity, int ip[]) | |
817 | { | |
818 | ip[0] = 0x40; | |
819 | ip[1] = 0x20; | |
820 | ip[2] = ((unsigned long) capacity + 1) / (ip[0] * ip[1]); | |
821 | if (ip[2] > 1024) { | |
822 | ip[0] = 0xff; | |
823 | ip[1] = 0x3f; | |
824 | ip[2] = ((unsigned long) capacity + 1) / (ip[0] * ip[1]); | |
825 | if (ip[2] > 1023) | |
826 | ip[2] = 1023; | |
827 | } | |
828 | return 0; | |
829 | } | |
830 | ||
831 | static int ppa_abort(struct scsi_cmnd *cmd) | |
832 | { | |
833 | ppa_struct *dev = ppa_dev(cmd->device->host); | |
834 | /* | |
835 | * There is no method for aborting commands since Iomega | |
836 | * have tied the SCSI_MESSAGE line high in the interface | |
837 | */ | |
838 | ||
839 | switch (cmd->SCp.phase) { | |
840 | case 0: /* Do not have access to parport */ | |
841 | case 1: /* Have not connected to interface */ | |
842 | dev->cur_cmd = NULL; /* Forget the problem */ | |
843 | return SUCCESS; | |
844 | break; | |
845 | default: /* SCSI command sent, can not abort */ | |
846 | return FAILED; | |
847 | break; | |
848 | } | |
849 | } | |
850 | ||
851 | static void ppa_reset_pulse(unsigned int base) | |
852 | { | |
853 | w_dtr(base, 0x40); | |
854 | w_ctr(base, 0x8); | |
855 | udelay(30); | |
856 | w_ctr(base, 0xc); | |
857 | } | |
858 | ||
859 | static int ppa_reset(struct scsi_cmnd *cmd) | |
860 | { | |
861 | ppa_struct *dev = ppa_dev(cmd->device->host); | |
862 | ||
863 | if (cmd->SCp.phase) | |
864 | ppa_disconnect(dev); | |
865 | dev->cur_cmd = NULL; /* Forget the problem */ | |
866 | ||
867 | ppa_connect(dev, CONNECT_NORMAL); | |
868 | ppa_reset_pulse(dev->base); | |
68b3aa7c | 869 | mdelay(1); /* device settle delay */ |
1da177e4 | 870 | ppa_disconnect(dev); |
68b3aa7c | 871 | mdelay(1); /* device settle delay */ |
1da177e4 LT |
872 | return SUCCESS; |
873 | } | |
874 | ||
875 | static int device_check(ppa_struct *dev) | |
876 | { | |
877 | /* This routine looks for a device and then attempts to use EPP | |
878 | to send a command. If all goes as planned then EPP is available. */ | |
879 | ||
cebadc5c | 880 | static u8 cmd[6] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }; |
1da177e4 LT |
881 | int loop, old_mode, status, k, ppb = dev->base; |
882 | unsigned char l; | |
883 | ||
884 | old_mode = dev->mode; | |
885 | for (loop = 0; loop < 8; loop++) { | |
886 | /* Attempt to use EPP for Test Unit Ready */ | |
887 | if ((ppb & 0x0007) == 0x0000) | |
888 | dev->mode = PPA_EPP_32; | |
889 | ||
cebadc5c | 890 | second_pass: |
1da177e4 LT |
891 | ppa_connect(dev, CONNECT_EPP_MAYBE); |
892 | /* Select SCSI device */ | |
893 | if (!ppa_select(dev, loop)) { | |
894 | ppa_disconnect(dev); | |
895 | continue; | |
896 | } | |
cebadc5c | 897 | printk(KERN_INFO "ppa: Found device at ID %i, Attempting to use %s\n", |
1da177e4 LT |
898 | loop, PPA_MODE_STRING[dev->mode]); |
899 | ||
900 | /* Send SCSI command */ | |
901 | status = 1; | |
902 | w_ctr(ppb, 0x0c); | |
903 | for (l = 0; (l < 6) && (status); l++) | |
904 | status = ppa_out(dev, cmd, 1); | |
905 | ||
906 | if (!status) { | |
907 | ppa_disconnect(dev); | |
908 | ppa_connect(dev, CONNECT_EPP_MAYBE); | |
909 | w_dtr(ppb, 0x40); | |
910 | w_ctr(ppb, 0x08); | |
911 | udelay(30); | |
912 | w_ctr(ppb, 0x0c); | |
913 | udelay(1000); | |
914 | ppa_disconnect(dev); | |
915 | udelay(1000); | |
916 | if (dev->mode == PPA_EPP_32) { | |
917 | dev->mode = old_mode; | |
918 | goto second_pass; | |
919 | } | |
920 | return -EIO; | |
921 | } | |
922 | w_ctr(ppb, 0x0c); | |
923 | k = 1000000; /* 1 Second */ | |
924 | do { | |
925 | l = r_str(ppb); | |
926 | k--; | |
927 | udelay(1); | |
928 | } while (!(l & 0x80) && (k)); | |
929 | ||
930 | l &= 0xf0; | |
931 | ||
932 | if (l != 0xf0) { | |
933 | ppa_disconnect(dev); | |
934 | ppa_connect(dev, CONNECT_EPP_MAYBE); | |
935 | ppa_reset_pulse(ppb); | |
936 | udelay(1000); | |
937 | ppa_disconnect(dev); | |
938 | udelay(1000); | |
939 | if (dev->mode == PPA_EPP_32) { | |
940 | dev->mode = old_mode; | |
941 | goto second_pass; | |
942 | } | |
943 | return -EIO; | |
944 | } | |
945 | ppa_disconnect(dev); | |
cebadc5c | 946 | printk(KERN_INFO "ppa: Communication established with ID %i using %s\n", |
1da177e4 LT |
947 | loop, PPA_MODE_STRING[dev->mode]); |
948 | ppa_connect(dev, CONNECT_EPP_MAYBE); | |
949 | ppa_reset_pulse(ppb); | |
950 | udelay(1000); | |
951 | ppa_disconnect(dev); | |
952 | udelay(1000); | |
953 | return 0; | |
954 | } | |
955 | return -ENODEV; | |
956 | } | |
957 | ||
78a904b6 RD |
958 | static int ppa_adjust_queue(struct scsi_device *device) |
959 | { | |
960 | blk_queue_bounce_limit(device->request_queue, BLK_BOUNCE_HIGH); | |
961 | return 0; | |
962 | } | |
963 | ||
1da177e4 LT |
964 | static struct scsi_host_template ppa_template = { |
965 | .module = THIS_MODULE, | |
966 | .proc_name = "ppa", | |
b7654914 AV |
967 | .show_info = ppa_show_info, |
968 | .write_info = ppa_write_info, | |
1da177e4 LT |
969 | .name = "Iomega VPI0 (ppa) interface", |
970 | .queuecommand = ppa_queuecommand, | |
971 | .eh_abort_handler = ppa_abort, | |
972 | .eh_bus_reset_handler = ppa_reset, | |
973 | .eh_host_reset_handler = ppa_reset, | |
974 | .bios_param = ppa_biosparam, | |
975 | .this_id = -1, | |
976 | .sg_tablesize = SG_ALL, | |
1da177e4 LT |
977 | .use_clustering = ENABLE_CLUSTERING, |
978 | .can_queue = 1, | |
78a904b6 | 979 | .slave_alloc = ppa_adjust_queue, |
1da177e4 LT |
980 | }; |
981 | ||
982 | /*************************************************************************** | |
983 | * Parallel port probing routines * | |
984 | ***************************************************************************/ | |
985 | ||
986 | static LIST_HEAD(ppa_hosts); | |
987 | ||
988 | static int __ppa_attach(struct parport *pb) | |
989 | { | |
990 | struct Scsi_Host *host; | |
7259f0d0 | 991 | DECLARE_WAIT_QUEUE_HEAD_ONSTACK(waiting); |
1da177e4 LT |
992 | DEFINE_WAIT(wait); |
993 | ppa_struct *dev; | |
994 | int ports; | |
995 | int modes, ppb, ppb_hi; | |
996 | int err = -ENOMEM; | |
997 | ||
dd00cc48 | 998 | dev = kzalloc(sizeof(ppa_struct), GFP_KERNEL); |
1da177e4 LT |
999 | if (!dev) |
1000 | return -ENOMEM; | |
1da177e4 LT |
1001 | dev->base = -1; |
1002 | dev->mode = PPA_AUTODETECT; | |
1003 | dev->recon_tmo = PPA_RECON_TMO; | |
1004 | init_waitqueue_head(&waiting); | |
1005 | dev->dev = parport_register_device(pb, "ppa", NULL, ppa_wakeup, | |
1006 | NULL, 0, dev); | |
1007 | ||
1008 | if (!dev->dev) | |
1009 | goto out; | |
1010 | ||
1011 | /* Claim the bus so it remembers what we do to the control | |
1012 | * registers. [ CTR and ECP ] | |
1013 | */ | |
1014 | err = -EBUSY; | |
1015 | dev->waiting = &waiting; | |
1016 | prepare_to_wait(&waiting, &wait, TASK_UNINTERRUPTIBLE); | |
1017 | if (ppa_pb_claim(dev)) | |
1018 | schedule_timeout(3 * HZ); | |
1019 | if (dev->wanted) { | |
1020 | printk(KERN_ERR "ppa%d: failed to claim parport because " | |
1021 | "a pardevice is owning the port for too long " | |
1022 | "time!\n", pb->number); | |
1023 | ppa_pb_dismiss(dev); | |
1024 | dev->waiting = NULL; | |
1025 | finish_wait(&waiting, &wait); | |
1026 | goto out1; | |
1027 | } | |
1028 | dev->waiting = NULL; | |
1029 | finish_wait(&waiting, &wait); | |
1030 | ppb = dev->base = dev->dev->port->base; | |
1031 | ppb_hi = dev->dev->port->base_hi; | |
1032 | w_ctr(ppb, 0x0c); | |
1033 | modes = dev->dev->port->modes; | |
1034 | ||
1035 | /* Mode detection works up the chain of speed | |
1036 | * This avoids a nasty if-then-else-if-... tree | |
1037 | */ | |
1038 | dev->mode = PPA_NIBBLE; | |
1039 | ||
1040 | if (modes & PARPORT_MODE_TRISTATE) | |
1041 | dev->mode = PPA_PS2; | |
1042 | ||
1043 | if (modes & PARPORT_MODE_ECP) { | |
1044 | w_ecr(ppb_hi, 0x20); | |
1045 | dev->mode = PPA_PS2; | |
1046 | } | |
1047 | if ((modes & PARPORT_MODE_EPP) && (modes & PARPORT_MODE_ECP)) | |
1048 | w_ecr(ppb_hi, 0x80); | |
1049 | ||
1050 | /* Done configuration */ | |
1051 | ||
1052 | err = ppa_init(dev); | |
1053 | ppa_pb_release(dev); | |
1054 | ||
1055 | if (err) | |
1056 | goto out1; | |
1057 | ||
1058 | /* now the glue ... */ | |
1059 | if (dev->mode == PPA_NIBBLE || dev->mode == PPA_PS2) | |
1060 | ports = 3; | |
1061 | else | |
1062 | ports = 8; | |
1063 | ||
c4028958 | 1064 | INIT_DELAYED_WORK(&dev->ppa_tq, ppa_interrupt); |
1da177e4 LT |
1065 | |
1066 | err = -ENOMEM; | |
1067 | host = scsi_host_alloc(&ppa_template, sizeof(ppa_struct *)); | |
1068 | if (!host) | |
1069 | goto out1; | |
1070 | host->io_port = pb->base; | |
1071 | host->n_io_port = ports; | |
1072 | host->dma_channel = -1; | |
1073 | host->unique_id = pb->number; | |
1074 | *(ppa_struct **)&host->hostdata = dev; | |
1075 | dev->host = host; | |
1076 | list_add_tail(&dev->list, &ppa_hosts); | |
1077 | err = scsi_add_host(host, NULL); | |
1078 | if (err) | |
1079 | goto out2; | |
1080 | scsi_scan_host(host); | |
1081 | return 0; | |
1082 | out2: | |
1083 | list_del_init(&dev->list); | |
1084 | scsi_host_put(host); | |
1085 | out1: | |
1086 | parport_unregister_device(dev->dev); | |
1087 | out: | |
1088 | kfree(dev); | |
1089 | return err; | |
1090 | } | |
1091 | ||
1092 | static void ppa_attach(struct parport *pb) | |
1093 | { | |
1094 | __ppa_attach(pb); | |
1095 | } | |
1096 | ||
1097 | static void ppa_detach(struct parport *pb) | |
1098 | { | |
1099 | ppa_struct *dev; | |
1100 | list_for_each_entry(dev, &ppa_hosts, list) { | |
1101 | if (dev->dev->port == pb) { | |
1102 | list_del_init(&dev->list); | |
1103 | scsi_remove_host(dev->host); | |
1104 | scsi_host_put(dev->host); | |
1105 | parport_unregister_device(dev->dev); | |
1106 | kfree(dev); | |
1107 | break; | |
1108 | } | |
1109 | } | |
1110 | } | |
1111 | ||
1112 | static struct parport_driver ppa_driver = { | |
1113 | .name = "ppa", | |
1114 | .attach = ppa_attach, | |
1115 | .detach = ppa_detach, | |
1116 | }; | |
1117 | ||
1118 | static int __init ppa_driver_init(void) | |
1119 | { | |
cebadc5c | 1120 | printk(KERN_INFO "ppa: Version %s\n", PPA_VERSION); |
1da177e4 LT |
1121 | return parport_register_driver(&ppa_driver); |
1122 | } | |
1123 | ||
1124 | static void __exit ppa_driver_exit(void) | |
1125 | { | |
1126 | parport_unregister_driver(&ppa_driver); | |
1127 | } | |
1128 | ||
1129 | module_init(ppa_driver_init); | |
1130 | module_exit(ppa_driver_exit); | |
1131 | MODULE_LICENSE("GPL"); |