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1da177e4 LT |
1 | /* |
2 | pt.c (c) 1998 Grant R. Guenther <grant@torque.net> | |
3 | Under the terms of the GNU General Public License. | |
4 | ||
5 | This is the high-level driver for parallel port ATAPI tape | |
6 | drives based on chips supported by the paride module. | |
7 | ||
8 | The driver implements both rewinding and non-rewinding | |
9 | devices, filemarks, and the rewind ioctl. It allocates | |
10 | a small internal "bounce buffer" for each open device, but | |
11 | otherwise expects buffering and blocking to be done at the | |
12 | user level. As with most block-structured tapes, short | |
13 | writes are padded to full tape blocks, so reading back a file | |
14 | may return more data than was actually written. | |
15 | ||
16 | By default, the driver will autoprobe for a single parallel | |
17 | port ATAPI tape drive, but if their individual parameters are | |
18 | specified, the driver can handle up to 4 drives. | |
19 | ||
20 | The rewinding devices are named /dev/pt0, /dev/pt1, ... | |
21 | while the non-rewinding devices are /dev/npt0, /dev/npt1, etc. | |
22 | ||
23 | The behaviour of the pt driver can be altered by setting | |
24 | some parameters from the insmod command line. The following | |
25 | parameters are adjustable: | |
26 | ||
27 | drive0 These four arguments can be arrays of | |
28 | drive1 1-6 integers as follows: | |
29 | drive2 | |
30 | drive3 <prt>,<pro>,<uni>,<mod>,<slv>,<dly> | |
31 | ||
32 | Where, | |
33 | ||
34 | <prt> is the base of the parallel port address for | |
35 | the corresponding drive. (required) | |
36 | ||
37 | <pro> is the protocol number for the adapter that | |
38 | supports this drive. These numbers are | |
39 | logged by 'paride' when the protocol modules | |
40 | are initialised. (0 if not given) | |
41 | ||
42 | <uni> for those adapters that support chained | |
43 | devices, this is the unit selector for the | |
44 | chain of devices on the given port. It should | |
45 | be zero for devices that don't support chaining. | |
46 | (0 if not given) | |
47 | ||
48 | <mod> this can be -1 to choose the best mode, or one | |
49 | of the mode numbers supported by the adapter. | |
50 | (-1 if not given) | |
51 | ||
52 | <slv> ATAPI devices can be jumpered to master or slave. | |
53 | Set this to 0 to choose the master drive, 1 to | |
54 | choose the slave, -1 (the default) to choose the | |
55 | first drive found. | |
56 | ||
57 | <dly> some parallel ports require the driver to | |
58 | go more slowly. -1 sets a default value that | |
59 | should work with the chosen protocol. Otherwise, | |
60 | set this to a small integer, the larger it is | |
61 | the slower the port i/o. In some cases, setting | |
62 | this to zero will speed up the device. (default -1) | |
63 | ||
64 | major You may use this parameter to overide the | |
65 | default major number (96) that this driver | |
66 | will use. Be sure to change the device | |
67 | name as well. | |
68 | ||
69 | name This parameter is a character string that | |
70 | contains the name the kernel will use for this | |
71 | device (in /proc output, for instance). | |
72 | (default "pt"). | |
73 | ||
74 | verbose This parameter controls the amount of logging | |
75 | that the driver will do. Set it to 0 for | |
76 | normal operation, 1 to see autoprobe progress | |
77 | messages, or 2 to see additional debugging | |
78 | output. (default 0) | |
79 | ||
80 | If this driver is built into the kernel, you can use | |
81 | the following command line parameters, with the same values | |
82 | as the corresponding module parameters listed above: | |
83 | ||
84 | pt.drive0 | |
85 | pt.drive1 | |
86 | pt.drive2 | |
87 | pt.drive3 | |
88 | ||
89 | In addition, you can use the parameter pt.disable to disable | |
90 | the driver entirely. | |
91 | ||
92 | */ | |
93 | ||
94 | /* Changes: | |
95 | ||
96 | 1.01 GRG 1998.05.06 Round up transfer size, fix ready_wait, | |
97 | loosed interpretation of ATAPI standard | |
98 | for clearing error status. | |
99 | Eliminate sti(); | |
100 | 1.02 GRG 1998.06.16 Eliminate an Ugh. | |
101 | 1.03 GRG 1998.08.15 Adjusted PT_TMO, use HZ in loop timing, | |
102 | extra debugging | |
103 | 1.04 GRG 1998.09.24 Repair minor coding error, added jumbo support | |
104 | ||
105 | */ | |
106 | ||
107 | #define PT_VERSION "1.04" | |
108 | #define PT_MAJOR 96 | |
109 | #define PT_NAME "pt" | |
110 | #define PT_UNITS 4 | |
111 | ||
112 | /* Here are things one can override from the insmod command. | |
113 | Most are autoprobed by paride unless set here. Verbose is on | |
114 | by default. | |
115 | ||
116 | */ | |
117 | ||
118 | static int verbose = 0; | |
119 | static int major = PT_MAJOR; | |
120 | static char *name = PT_NAME; | |
121 | static int disable = 0; | |
122 | ||
123 | static int drive0[6] = { 0, 0, 0, -1, -1, -1 }; | |
124 | static int drive1[6] = { 0, 0, 0, -1, -1, -1 }; | |
125 | static int drive2[6] = { 0, 0, 0, -1, -1, -1 }; | |
126 | static int drive3[6] = { 0, 0, 0, -1, -1, -1 }; | |
127 | ||
128 | static int (*drives[4])[6] = {&drive0, &drive1, &drive2, &drive3}; | |
129 | ||
130 | #define D_PRT 0 | |
131 | #define D_PRO 1 | |
132 | #define D_UNI 2 | |
133 | #define D_MOD 3 | |
134 | #define D_SLV 4 | |
135 | #define D_DLY 5 | |
136 | ||
137 | #define DU (*drives[unit]) | |
138 | ||
139 | /* end of parameters */ | |
140 | ||
141 | #include <linux/module.h> | |
142 | #include <linux/init.h> | |
143 | #include <linux/fs.h> | |
144 | #include <linux/devfs_fs_kernel.h> | |
145 | #include <linux/delay.h> | |
146 | #include <linux/slab.h> | |
147 | #include <linux/mtio.h> | |
148 | #include <linux/device.h> | |
149 | ||
150 | #include <asm/uaccess.h> | |
151 | ||
152 | module_param(verbose, bool, 0); | |
153 | module_param(major, int, 0); | |
154 | module_param(name, charp, 0); | |
155 | module_param_array(drive0, int, NULL, 0); | |
156 | module_param_array(drive1, int, NULL, 0); | |
157 | module_param_array(drive2, int, NULL, 0); | |
158 | module_param_array(drive3, int, NULL, 0); | |
159 | ||
160 | #include "paride.h" | |
161 | ||
162 | #define PT_MAX_RETRIES 5 | |
163 | #define PT_TMO 3000 /* interrupt timeout in jiffies */ | |
164 | #define PT_SPIN_DEL 50 /* spin delay in micro-seconds */ | |
165 | #define PT_RESET_TMO 30 /* 30 seconds */ | |
166 | #define PT_READY_TMO 60 /* 60 seconds */ | |
167 | #define PT_REWIND_TMO 1200 /* 20 minutes */ | |
168 | ||
169 | #define PT_SPIN ((1000000/(HZ*PT_SPIN_DEL))*PT_TMO) | |
170 | ||
171 | #define STAT_ERR 0x00001 | |
172 | #define STAT_INDEX 0x00002 | |
173 | #define STAT_ECC 0x00004 | |
174 | #define STAT_DRQ 0x00008 | |
175 | #define STAT_SEEK 0x00010 | |
176 | #define STAT_WRERR 0x00020 | |
177 | #define STAT_READY 0x00040 | |
178 | #define STAT_BUSY 0x00080 | |
179 | #define STAT_SENSE 0x1f000 | |
180 | ||
181 | #define ATAPI_TEST_READY 0x00 | |
182 | #define ATAPI_REWIND 0x01 | |
183 | #define ATAPI_REQ_SENSE 0x03 | |
184 | #define ATAPI_READ_6 0x08 | |
185 | #define ATAPI_WRITE_6 0x0a | |
186 | #define ATAPI_WFM 0x10 | |
187 | #define ATAPI_IDENTIFY 0x12 | |
188 | #define ATAPI_MODE_SENSE 0x1a | |
189 | #define ATAPI_LOG_SENSE 0x4d | |
190 | ||
191 | static int pt_open(struct inode *inode, struct file *file); | |
192 | static int pt_ioctl(struct inode *inode, struct file *file, | |
193 | unsigned int cmd, unsigned long arg); | |
194 | static int pt_release(struct inode *inode, struct file *file); | |
195 | static ssize_t pt_read(struct file *filp, char __user *buf, | |
196 | size_t count, loff_t * ppos); | |
197 | static ssize_t pt_write(struct file *filp, const char __user *buf, | |
198 | size_t count, loff_t * ppos); | |
199 | static int pt_detect(void); | |
200 | ||
201 | /* bits in tape->flags */ | |
202 | ||
203 | #define PT_MEDIA 1 | |
204 | #define PT_WRITE_OK 2 | |
205 | #define PT_REWIND 4 | |
206 | #define PT_WRITING 8 | |
207 | #define PT_READING 16 | |
208 | #define PT_EOF 32 | |
209 | ||
210 | #define PT_NAMELEN 8 | |
211 | #define PT_BUFSIZE 16384 | |
212 | ||
213 | struct pt_unit { | |
214 | struct pi_adapter pia; /* interface to paride layer */ | |
215 | struct pi_adapter *pi; | |
216 | int flags; /* various state flags */ | |
217 | int last_sense; /* result of last request sense */ | |
218 | int drive; /* drive */ | |
219 | atomic_t available; /* 1 if access is available 0 otherwise */ | |
220 | int bs; /* block size */ | |
221 | int capacity; /* Size of tape in KB */ | |
222 | int present; /* device present ? */ | |
223 | char *bufptr; | |
224 | char name[PT_NAMELEN]; /* pf0, pf1, ... */ | |
225 | }; | |
226 | ||
227 | static int pt_identify(struct pt_unit *tape); | |
228 | ||
229 | static struct pt_unit pt[PT_UNITS]; | |
230 | ||
231 | static char pt_scratch[512]; /* scratch block buffer */ | |
232 | ||
233 | /* kernel glue structures */ | |
234 | ||
235 | static struct file_operations pt_fops = { | |
236 | .owner = THIS_MODULE, | |
237 | .read = pt_read, | |
238 | .write = pt_write, | |
239 | .ioctl = pt_ioctl, | |
240 | .open = pt_open, | |
241 | .release = pt_release, | |
242 | }; | |
243 | ||
244 | /* sysfs class support */ | |
245 | static struct class_simple *pt_class; | |
246 | ||
247 | static inline int status_reg(struct pi_adapter *pi) | |
248 | { | |
249 | return pi_read_regr(pi, 1, 6); | |
250 | } | |
251 | ||
252 | static inline int read_reg(struct pi_adapter *pi, int reg) | |
253 | { | |
254 | return pi_read_regr(pi, 0, reg); | |
255 | } | |
256 | ||
257 | static inline void write_reg(struct pi_adapter *pi, int reg, int val) | |
258 | { | |
259 | pi_write_regr(pi, 0, reg, val); | |
260 | } | |
261 | ||
262 | static inline u8 DRIVE(struct pt_unit *tape) | |
263 | { | |
264 | return 0xa0+0x10*tape->drive; | |
265 | } | |
266 | ||
267 | static int pt_wait(struct pt_unit *tape, int go, int stop, char *fun, char *msg) | |
268 | { | |
269 | int j, r, e, s, p; | |
270 | struct pi_adapter *pi = tape->pi; | |
271 | ||
272 | j = 0; | |
273 | while ((((r = status_reg(pi)) & go) || (stop && (!(r & stop)))) | |
274 | && (j++ < PT_SPIN)) | |
275 | udelay(PT_SPIN_DEL); | |
276 | ||
277 | if ((r & (STAT_ERR & stop)) || (j >= PT_SPIN)) { | |
278 | s = read_reg(pi, 7); | |
279 | e = read_reg(pi, 1); | |
280 | p = read_reg(pi, 2); | |
281 | if (j >= PT_SPIN) | |
282 | e |= 0x100; | |
283 | if (fun) | |
284 | printk("%s: %s %s: alt=0x%x stat=0x%x err=0x%x" | |
285 | " loop=%d phase=%d\n", | |
286 | tape->name, fun, msg, r, s, e, j, p); | |
287 | return (e << 8) + s; | |
288 | } | |
289 | return 0; | |
290 | } | |
291 | ||
292 | static int pt_command(struct pt_unit *tape, char *cmd, int dlen, char *fun) | |
293 | { | |
294 | struct pi_adapter *pi = tape->pi; | |
295 | pi_connect(pi); | |
296 | ||
297 | write_reg(pi, 6, DRIVE(tape)); | |
298 | ||
299 | if (pt_wait(tape, STAT_BUSY | STAT_DRQ, 0, fun, "before command")) { | |
300 | pi_disconnect(pi); | |
301 | return -1; | |
302 | } | |
303 | ||
304 | write_reg(pi, 4, dlen % 256); | |
305 | write_reg(pi, 5, dlen / 256); | |
306 | write_reg(pi, 7, 0xa0); /* ATAPI packet command */ | |
307 | ||
308 | if (pt_wait(tape, STAT_BUSY, STAT_DRQ, fun, "command DRQ")) { | |
309 | pi_disconnect(pi); | |
310 | return -1; | |
311 | } | |
312 | ||
313 | if (read_reg(pi, 2) != 1) { | |
314 | printk("%s: %s: command phase error\n", tape->name, fun); | |
315 | pi_disconnect(pi); | |
316 | return -1; | |
317 | } | |
318 | ||
319 | pi_write_block(pi, cmd, 12); | |
320 | ||
321 | return 0; | |
322 | } | |
323 | ||
324 | static int pt_completion(struct pt_unit *tape, char *buf, char *fun) | |
325 | { | |
326 | struct pi_adapter *pi = tape->pi; | |
327 | int r, s, n, p; | |
328 | ||
329 | r = pt_wait(tape, STAT_BUSY, STAT_DRQ | STAT_READY | STAT_ERR, | |
330 | fun, "completion"); | |
331 | ||
332 | if (read_reg(pi, 7) & STAT_DRQ) { | |
333 | n = (((read_reg(pi, 4) + 256 * read_reg(pi, 5)) + | |
334 | 3) & 0xfffc); | |
335 | p = read_reg(pi, 2) & 3; | |
336 | if (p == 0) | |
337 | pi_write_block(pi, buf, n); | |
338 | if (p == 2) | |
339 | pi_read_block(pi, buf, n); | |
340 | } | |
341 | ||
342 | s = pt_wait(tape, STAT_BUSY, STAT_READY | STAT_ERR, fun, "data done"); | |
343 | ||
344 | pi_disconnect(pi); | |
345 | ||
346 | return (r ? r : s); | |
347 | } | |
348 | ||
349 | static void pt_req_sense(struct pt_unit *tape, int quiet) | |
350 | { | |
351 | char rs_cmd[12] = { ATAPI_REQ_SENSE, 0, 0, 0, 16, 0, 0, 0, 0, 0, 0, 0 }; | |
352 | char buf[16]; | |
353 | int r; | |
354 | ||
355 | r = pt_command(tape, rs_cmd, 16, "Request sense"); | |
356 | mdelay(1); | |
357 | if (!r) | |
358 | pt_completion(tape, buf, "Request sense"); | |
359 | ||
360 | tape->last_sense = -1; | |
361 | if (!r) { | |
362 | if (!quiet) | |
363 | printk("%s: Sense key: %x, ASC: %x, ASQ: %x\n", | |
364 | tape->name, buf[2] & 0xf, buf[12], buf[13]); | |
365 | tape->last_sense = (buf[2] & 0xf) | ((buf[12] & 0xff) << 8) | |
366 | | ((buf[13] & 0xff) << 16); | |
367 | } | |
368 | } | |
369 | ||
370 | static int pt_atapi(struct pt_unit *tape, char *cmd, int dlen, char *buf, char *fun) | |
371 | { | |
372 | int r; | |
373 | ||
374 | r = pt_command(tape, cmd, dlen, fun); | |
375 | mdelay(1); | |
376 | if (!r) | |
377 | r = pt_completion(tape, buf, fun); | |
378 | if (r) | |
379 | pt_req_sense(tape, !fun); | |
380 | ||
381 | return r; | |
382 | } | |
383 | ||
384 | static void pt_sleep(int cs) | |
385 | { | |
386 | current->state = TASK_INTERRUPTIBLE; | |
387 | schedule_timeout(cs); | |
388 | } | |
389 | ||
390 | static int pt_poll_dsc(struct pt_unit *tape, int pause, int tmo, char *msg) | |
391 | { | |
392 | struct pi_adapter *pi = tape->pi; | |
393 | int k, e, s; | |
394 | ||
395 | k = 0; | |
396 | e = 0; | |
397 | s = 0; | |
398 | while (k < tmo) { | |
399 | pt_sleep(pause); | |
400 | k++; | |
401 | pi_connect(pi); | |
402 | write_reg(pi, 6, DRIVE(tape)); | |
403 | s = read_reg(pi, 7); | |
404 | e = read_reg(pi, 1); | |
405 | pi_disconnect(pi); | |
406 | if (s & (STAT_ERR | STAT_SEEK)) | |
407 | break; | |
408 | } | |
409 | if ((k >= tmo) || (s & STAT_ERR)) { | |
410 | if (k >= tmo) | |
411 | printk("%s: %s DSC timeout\n", tape->name, msg); | |
412 | else | |
413 | printk("%s: %s stat=0x%x err=0x%x\n", tape->name, msg, s, | |
414 | e); | |
415 | pt_req_sense(tape, 0); | |
416 | return 0; | |
417 | } | |
418 | return 1; | |
419 | } | |
420 | ||
421 | static void pt_media_access_cmd(struct pt_unit *tape, int tmo, char *cmd, char *fun) | |
422 | { | |
423 | if (pt_command(tape, cmd, 0, fun)) { | |
424 | pt_req_sense(tape, 0); | |
425 | return; | |
426 | } | |
427 | pi_disconnect(tape->pi); | |
428 | pt_poll_dsc(tape, HZ, tmo, fun); | |
429 | } | |
430 | ||
431 | static void pt_rewind(struct pt_unit *tape) | |
432 | { | |
433 | char rw_cmd[12] = { ATAPI_REWIND, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }; | |
434 | ||
435 | pt_media_access_cmd(tape, PT_REWIND_TMO, rw_cmd, "rewind"); | |
436 | } | |
437 | ||
438 | static void pt_write_fm(struct pt_unit *tape) | |
439 | { | |
440 | char wm_cmd[12] = { ATAPI_WFM, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0 }; | |
441 | ||
442 | pt_media_access_cmd(tape, PT_TMO, wm_cmd, "write filemark"); | |
443 | } | |
444 | ||
445 | #define DBMSG(msg) ((verbose>1)?(msg):NULL) | |
446 | ||
447 | static int pt_reset(struct pt_unit *tape) | |
448 | { | |
449 | struct pi_adapter *pi = tape->pi; | |
450 | int i, k, flg; | |
451 | int expect[5] = { 1, 1, 1, 0x14, 0xeb }; | |
452 | ||
453 | pi_connect(pi); | |
454 | write_reg(pi, 6, DRIVE(tape)); | |
455 | write_reg(pi, 7, 8); | |
456 | ||
457 | pt_sleep(20 * HZ / 1000); | |
458 | ||
459 | k = 0; | |
460 | while ((k++ < PT_RESET_TMO) && (status_reg(pi) & STAT_BUSY)) | |
461 | pt_sleep(HZ / 10); | |
462 | ||
463 | flg = 1; | |
464 | for (i = 0; i < 5; i++) | |
465 | flg &= (read_reg(pi, i + 1) == expect[i]); | |
466 | ||
467 | if (verbose) { | |
468 | printk("%s: Reset (%d) signature = ", tape->name, k); | |
469 | for (i = 0; i < 5; i++) | |
470 | printk("%3x", read_reg(pi, i + 1)); | |
471 | if (!flg) | |
472 | printk(" (incorrect)"); | |
473 | printk("\n"); | |
474 | } | |
475 | ||
476 | pi_disconnect(pi); | |
477 | return flg - 1; | |
478 | } | |
479 | ||
480 | static int pt_ready_wait(struct pt_unit *tape, int tmo) | |
481 | { | |
482 | char tr_cmd[12] = { ATAPI_TEST_READY, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }; | |
483 | int k, p; | |
484 | ||
485 | k = 0; | |
486 | while (k < tmo) { | |
487 | tape->last_sense = 0; | |
488 | pt_atapi(tape, tr_cmd, 0, NULL, DBMSG("test unit ready")); | |
489 | p = tape->last_sense; | |
490 | if (!p) | |
491 | return 0; | |
492 | if (!(((p & 0xffff) == 0x0402) || ((p & 0xff) == 6))) | |
493 | return p; | |
494 | k++; | |
495 | pt_sleep(HZ); | |
496 | } | |
497 | return 0x000020; /* timeout */ | |
498 | } | |
499 | ||
500 | static void xs(char *buf, char *targ, int offs, int len) | |
501 | { | |
502 | int j, k, l; | |
503 | ||
504 | j = 0; | |
505 | l = 0; | |
506 | for (k = 0; k < len; k++) | |
507 | if ((buf[k + offs] != 0x20) || (buf[k + offs] != l)) | |
508 | l = targ[j++] = buf[k + offs]; | |
509 | if (l == 0x20) | |
510 | j--; | |
511 | targ[j] = 0; | |
512 | } | |
513 | ||
514 | static int xn(char *buf, int offs, int size) | |
515 | { | |
516 | int v, k; | |
517 | ||
518 | v = 0; | |
519 | for (k = 0; k < size; k++) | |
520 | v = v * 256 + (buf[k + offs] & 0xff); | |
521 | return v; | |
522 | } | |
523 | ||
524 | static int pt_identify(struct pt_unit *tape) | |
525 | { | |
526 | int dt, s; | |
527 | char *ms[2] = { "master", "slave" }; | |
528 | char mf[10], id[18]; | |
529 | char id_cmd[12] = { ATAPI_IDENTIFY, 0, 0, 0, 36, 0, 0, 0, 0, 0, 0, 0 }; | |
530 | char ms_cmd[12] = | |
531 | { ATAPI_MODE_SENSE, 0, 0x2a, 0, 36, 0, 0, 0, 0, 0, 0, 0 }; | |
532 | char ls_cmd[12] = | |
533 | { ATAPI_LOG_SENSE, 0, 0x71, 0, 0, 0, 0, 0, 36, 0, 0, 0 }; | |
534 | char buf[36]; | |
535 | ||
536 | s = pt_atapi(tape, id_cmd, 36, buf, "identify"); | |
537 | if (s) | |
538 | return -1; | |
539 | ||
540 | dt = buf[0] & 0x1f; | |
541 | if (dt != 1) { | |
542 | if (verbose) | |
543 | printk("%s: Drive %d, unsupported type %d\n", | |
544 | tape->name, tape->drive, dt); | |
545 | return -1; | |
546 | } | |
547 | ||
548 | xs(buf, mf, 8, 8); | |
549 | xs(buf, id, 16, 16); | |
550 | ||
551 | tape->flags = 0; | |
552 | tape->capacity = 0; | |
553 | tape->bs = 0; | |
554 | ||
555 | if (!pt_ready_wait(tape, PT_READY_TMO)) | |
556 | tape->flags |= PT_MEDIA; | |
557 | ||
558 | if (!pt_atapi(tape, ms_cmd, 36, buf, "mode sense")) { | |
559 | if (!(buf[2] & 0x80)) | |
560 | tape->flags |= PT_WRITE_OK; | |
561 | tape->bs = xn(buf, 10, 2); | |
562 | } | |
563 | ||
564 | if (!pt_atapi(tape, ls_cmd, 36, buf, "log sense")) | |
565 | tape->capacity = xn(buf, 24, 4); | |
566 | ||
567 | printk("%s: %s %s, %s", tape->name, mf, id, ms[tape->drive]); | |
568 | if (!(tape->flags & PT_MEDIA)) | |
569 | printk(", no media\n"); | |
570 | else { | |
571 | if (!(tape->flags & PT_WRITE_OK)) | |
572 | printk(", RO"); | |
573 | printk(", blocksize %d, %d MB\n", tape->bs, tape->capacity / 1024); | |
574 | } | |
575 | ||
576 | return 0; | |
577 | } | |
578 | ||
579 | ||
580 | /* | |
581 | * returns 0, with id set if drive is detected | |
582 | * -1, if drive detection failed | |
583 | */ | |
584 | static int pt_probe(struct pt_unit *tape) | |
585 | { | |
586 | if (tape->drive == -1) { | |
587 | for (tape->drive = 0; tape->drive <= 1; tape->drive++) | |
588 | if (!pt_reset(tape)) | |
589 | return pt_identify(tape); | |
590 | } else { | |
591 | if (!pt_reset(tape)) | |
592 | return pt_identify(tape); | |
593 | } | |
594 | return -1; | |
595 | } | |
596 | ||
597 | static int pt_detect(void) | |
598 | { | |
599 | struct pt_unit *tape; | |
600 | int specified = 0, found = 0; | |
601 | int unit; | |
602 | ||
603 | printk("%s: %s version %s, major %d\n", name, name, PT_VERSION, major); | |
604 | ||
605 | specified = 0; | |
606 | for (unit = 0; unit < PT_UNITS; unit++) { | |
607 | struct pt_unit *tape = &pt[unit]; | |
608 | tape->pi = &tape->pia; | |
609 | atomic_set(&tape->available, 1); | |
610 | tape->flags = 0; | |
611 | tape->last_sense = 0; | |
612 | tape->present = 0; | |
613 | tape->bufptr = NULL; | |
614 | tape->drive = DU[D_SLV]; | |
615 | snprintf(tape->name, PT_NAMELEN, "%s%d", name, unit); | |
616 | if (!DU[D_PRT]) | |
617 | continue; | |
618 | specified++; | |
619 | if (pi_init(tape->pi, 0, DU[D_PRT], DU[D_MOD], DU[D_UNI], | |
620 | DU[D_PRO], DU[D_DLY], pt_scratch, PI_PT, | |
621 | verbose, tape->name)) { | |
622 | if (!pt_probe(tape)) { | |
623 | tape->present = 1; | |
624 | found++; | |
625 | } else | |
626 | pi_release(tape->pi); | |
627 | } | |
628 | } | |
629 | if (specified == 0) { | |
630 | tape = pt; | |
631 | if (pi_init(tape->pi, 1, -1, -1, -1, -1, -1, pt_scratch, | |
632 | PI_PT, verbose, tape->name)) { | |
633 | if (!pt_probe(tape)) { | |
634 | tape->present = 1; | |
635 | found++; | |
636 | } else | |
637 | pi_release(tape->pi); | |
638 | } | |
639 | ||
640 | } | |
641 | if (found) | |
642 | return 0; | |
643 | ||
644 | printk("%s: No ATAPI tape drive detected\n", name); | |
645 | return -1; | |
646 | } | |
647 | ||
648 | static int pt_open(struct inode *inode, struct file *file) | |
649 | { | |
650 | int unit = iminor(inode) & 0x7F; | |
651 | struct pt_unit *tape = pt + unit; | |
652 | int err; | |
653 | ||
654 | if (unit >= PT_UNITS || (!tape->present)) | |
655 | return -ENODEV; | |
656 | ||
657 | err = -EBUSY; | |
658 | if (!atomic_dec_and_test(&tape->available)) | |
659 | goto out; | |
660 | ||
661 | pt_identify(tape); | |
662 | ||
663 | err = -ENODEV; | |
664 | if (!tape->flags & PT_MEDIA) | |
665 | goto out; | |
666 | ||
667 | err = -EROFS; | |
668 | if ((!tape->flags & PT_WRITE_OK) && (file->f_mode & 2)) | |
669 | goto out; | |
670 | ||
671 | if (!(iminor(inode) & 128)) | |
672 | tape->flags |= PT_REWIND; | |
673 | ||
674 | err = -ENOMEM; | |
675 | tape->bufptr = kmalloc(PT_BUFSIZE, GFP_KERNEL); | |
676 | if (tape->bufptr == NULL) { | |
677 | printk("%s: buffer allocation failed\n", tape->name); | |
678 | goto out; | |
679 | } | |
680 | ||
681 | file->private_data = tape; | |
682 | return 0; | |
683 | ||
684 | out: | |
685 | atomic_inc(&tape->available); | |
686 | return err; | |
687 | } | |
688 | ||
689 | static int pt_ioctl(struct inode *inode, struct file *file, | |
690 | unsigned int cmd, unsigned long arg) | |
691 | { | |
692 | struct pt_unit *tape = file->private_data; | |
693 | struct mtop __user *p = (void __user *)arg; | |
694 | struct mtop mtop; | |
695 | ||
696 | switch (cmd) { | |
697 | case MTIOCTOP: | |
698 | if (copy_from_user(&mtop, p, sizeof(struct mtop))) | |
699 | return -EFAULT; | |
700 | ||
701 | switch (mtop.mt_op) { | |
702 | ||
703 | case MTREW: | |
704 | pt_rewind(tape); | |
705 | return 0; | |
706 | ||
707 | case MTWEOF: | |
708 | pt_write_fm(tape); | |
709 | return 0; | |
710 | ||
711 | default: | |
712 | printk("%s: Unimplemented mt_op %d\n", tape->name, | |
713 | mtop.mt_op); | |
714 | return -EINVAL; | |
715 | } | |
716 | ||
717 | default: | |
718 | printk("%s: Unimplemented ioctl 0x%x\n", tape->name, cmd); | |
719 | return -EINVAL; | |
720 | ||
721 | } | |
722 | } | |
723 | ||
724 | static int | |
725 | pt_release(struct inode *inode, struct file *file) | |
726 | { | |
727 | struct pt_unit *tape = file->private_data; | |
728 | ||
729 | if (atomic_read(&tape->available) > 1) | |
730 | return -EINVAL; | |
731 | ||
732 | if (tape->flags & PT_WRITING) | |
733 | pt_write_fm(tape); | |
734 | ||
735 | if (tape->flags & PT_REWIND) | |
736 | pt_rewind(tape); | |
737 | ||
738 | kfree(tape->bufptr); | |
739 | tape->bufptr = NULL; | |
740 | ||
741 | atomic_inc(&tape->available); | |
742 | ||
743 | return 0; | |
744 | ||
745 | } | |
746 | ||
747 | static ssize_t pt_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos) | |
748 | { | |
749 | struct pt_unit *tape = filp->private_data; | |
750 | struct pi_adapter *pi = tape->pi; | |
751 | char rd_cmd[12] = { ATAPI_READ_6, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }; | |
752 | int k, n, r, p, s, t, b; | |
753 | ||
754 | if (!(tape->flags & (PT_READING | PT_WRITING))) { | |
755 | tape->flags |= PT_READING; | |
756 | if (pt_atapi(tape, rd_cmd, 0, NULL, "start read-ahead")) | |
757 | return -EIO; | |
758 | } else if (tape->flags & PT_WRITING) | |
759 | return -EIO; | |
760 | ||
761 | if (tape->flags & PT_EOF) | |
762 | return 0; | |
763 | ||
764 | t = 0; | |
765 | ||
766 | while (count > 0) { | |
767 | ||
768 | if (!pt_poll_dsc(tape, HZ / 100, PT_TMO, "read")) | |
769 | return -EIO; | |
770 | ||
771 | n = count; | |
772 | if (n > 32768) | |
773 | n = 32768; /* max per command */ | |
774 | b = (n - 1 + tape->bs) / tape->bs; | |
775 | n = b * tape->bs; /* rounded up to even block */ | |
776 | ||
777 | rd_cmd[4] = b; | |
778 | ||
779 | r = pt_command(tape, rd_cmd, n, "read"); | |
780 | ||
781 | mdelay(1); | |
782 | ||
783 | if (r) { | |
784 | pt_req_sense(tape, 0); | |
785 | return -EIO; | |
786 | } | |
787 | ||
788 | while (1) { | |
789 | ||
790 | r = pt_wait(tape, STAT_BUSY, | |
791 | STAT_DRQ | STAT_ERR | STAT_READY, | |
792 | DBMSG("read DRQ"), ""); | |
793 | ||
794 | if (r & STAT_SENSE) { | |
795 | pi_disconnect(pi); | |
796 | pt_req_sense(tape, 0); | |
797 | return -EIO; | |
798 | } | |
799 | ||
800 | if (r) | |
801 | tape->flags |= PT_EOF; | |
802 | ||
803 | s = read_reg(pi, 7); | |
804 | ||
805 | if (!(s & STAT_DRQ)) | |
806 | break; | |
807 | ||
808 | n = (read_reg(pi, 4) + 256 * read_reg(pi, 5)); | |
809 | p = (read_reg(pi, 2) & 3); | |
810 | if (p != 2) { | |
811 | pi_disconnect(pi); | |
812 | printk("%s: Phase error on read: %d\n", tape->name, | |
813 | p); | |
814 | return -EIO; | |
815 | } | |
816 | ||
817 | while (n > 0) { | |
818 | k = n; | |
819 | if (k > PT_BUFSIZE) | |
820 | k = PT_BUFSIZE; | |
821 | pi_read_block(pi, tape->bufptr, k); | |
822 | n -= k; | |
823 | b = k; | |
824 | if (b > count) | |
825 | b = count; | |
826 | if (copy_to_user(buf + t, tape->bufptr, b)) { | |
827 | pi_disconnect(pi); | |
828 | return -EFAULT; | |
829 | } | |
830 | t += b; | |
831 | count -= b; | |
832 | } | |
833 | ||
834 | } | |
835 | pi_disconnect(pi); | |
836 | if (tape->flags & PT_EOF) | |
837 | break; | |
838 | } | |
839 | ||
840 | return t; | |
841 | ||
842 | } | |
843 | ||
844 | static ssize_t pt_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos) | |
845 | { | |
846 | struct pt_unit *tape = filp->private_data; | |
847 | struct pi_adapter *pi = tape->pi; | |
848 | char wr_cmd[12] = { ATAPI_WRITE_6, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }; | |
849 | int k, n, r, p, s, t, b; | |
850 | ||
851 | if (!(tape->flags & PT_WRITE_OK)) | |
852 | return -EROFS; | |
853 | ||
854 | if (!(tape->flags & (PT_READING | PT_WRITING))) { | |
855 | tape->flags |= PT_WRITING; | |
856 | if (pt_atapi | |
857 | (tape, wr_cmd, 0, NULL, "start buffer-available mode")) | |
858 | return -EIO; | |
859 | } else if (tape->flags & PT_READING) | |
860 | return -EIO; | |
861 | ||
862 | if (tape->flags & PT_EOF) | |
863 | return -ENOSPC; | |
864 | ||
865 | t = 0; | |
866 | ||
867 | while (count > 0) { | |
868 | ||
869 | if (!pt_poll_dsc(tape, HZ / 100, PT_TMO, "write")) | |
870 | return -EIO; | |
871 | ||
872 | n = count; | |
873 | if (n > 32768) | |
874 | n = 32768; /* max per command */ | |
875 | b = (n - 1 + tape->bs) / tape->bs; | |
876 | n = b * tape->bs; /* rounded up to even block */ | |
877 | ||
878 | wr_cmd[4] = b; | |
879 | ||
880 | r = pt_command(tape, wr_cmd, n, "write"); | |
881 | ||
882 | mdelay(1); | |
883 | ||
884 | if (r) { /* error delivering command only */ | |
885 | pt_req_sense(tape, 0); | |
886 | return -EIO; | |
887 | } | |
888 | ||
889 | while (1) { | |
890 | ||
891 | r = pt_wait(tape, STAT_BUSY, | |
892 | STAT_DRQ | STAT_ERR | STAT_READY, | |
893 | DBMSG("write DRQ"), NULL); | |
894 | ||
895 | if (r & STAT_SENSE) { | |
896 | pi_disconnect(pi); | |
897 | pt_req_sense(tape, 0); | |
898 | return -EIO; | |
899 | } | |
900 | ||
901 | if (r) | |
902 | tape->flags |= PT_EOF; | |
903 | ||
904 | s = read_reg(pi, 7); | |
905 | ||
906 | if (!(s & STAT_DRQ)) | |
907 | break; | |
908 | ||
909 | n = (read_reg(pi, 4) + 256 * read_reg(pi, 5)); | |
910 | p = (read_reg(pi, 2) & 3); | |
911 | if (p != 0) { | |
912 | pi_disconnect(pi); | |
913 | printk("%s: Phase error on write: %d \n", | |
914 | tape->name, p); | |
915 | return -EIO; | |
916 | } | |
917 | ||
918 | while (n > 0) { | |
919 | k = n; | |
920 | if (k > PT_BUFSIZE) | |
921 | k = PT_BUFSIZE; | |
922 | b = k; | |
923 | if (b > count) | |
924 | b = count; | |
925 | if (copy_from_user(tape->bufptr, buf + t, b)) { | |
926 | pi_disconnect(pi); | |
927 | return -EFAULT; | |
928 | } | |
929 | pi_write_block(pi, tape->bufptr, k); | |
930 | t += b; | |
931 | count -= b; | |
932 | n -= k; | |
933 | } | |
934 | ||
935 | } | |
936 | pi_disconnect(pi); | |
937 | if (tape->flags & PT_EOF) | |
938 | break; | |
939 | } | |
940 | ||
941 | return t; | |
942 | } | |
943 | ||
944 | static int __init pt_init(void) | |
945 | { | |
946 | int unit, err = 0; | |
947 | ||
948 | if (disable) { | |
949 | err = -1; | |
950 | goto out; | |
951 | } | |
952 | ||
953 | if (pt_detect()) { | |
954 | err = -1; | |
955 | goto out; | |
956 | } | |
957 | ||
958 | if (register_chrdev(major, name, &pt_fops)) { | |
959 | printk("pt_init: unable to get major number %d\n", major); | |
960 | for (unit = 0; unit < PT_UNITS; unit++) | |
961 | if (pt[unit].present) | |
962 | pi_release(pt[unit].pi); | |
963 | err = -1; | |
964 | goto out; | |
965 | } | |
966 | pt_class = class_simple_create(THIS_MODULE, "pt"); | |
967 | if (IS_ERR(pt_class)) { | |
968 | err = PTR_ERR(pt_class); | |
969 | goto out_chrdev; | |
970 | } | |
971 | ||
972 | devfs_mk_dir("pt"); | |
973 | for (unit = 0; unit < PT_UNITS; unit++) | |
974 | if (pt[unit].present) { | |
975 | class_simple_device_add(pt_class, MKDEV(major, unit), | |
976 | NULL, "pt%d", unit); | |
977 | err = devfs_mk_cdev(MKDEV(major, unit), | |
978 | S_IFCHR | S_IRUSR | S_IWUSR, | |
979 | "pt/%d", unit); | |
980 | if (err) { | |
981 | class_simple_device_remove(MKDEV(major, unit)); | |
982 | goto out_class; | |
983 | } | |
984 | class_simple_device_add(pt_class, MKDEV(major, unit + 128), | |
985 | NULL, "pt%dn", unit); | |
986 | err = devfs_mk_cdev(MKDEV(major, unit + 128), | |
987 | S_IFCHR | S_IRUSR | S_IWUSR, | |
988 | "pt/%dn", unit); | |
989 | if (err) { | |
990 | class_simple_device_remove(MKDEV(major, unit + 128)); | |
991 | goto out_class; | |
992 | } | |
993 | } | |
994 | goto out; | |
995 | ||
996 | out_class: | |
997 | class_simple_destroy(pt_class); | |
998 | out_chrdev: | |
999 | unregister_chrdev(major, "pt"); | |
1000 | out: | |
1001 | return err; | |
1002 | } | |
1003 | ||
1004 | static void __exit pt_exit(void) | |
1005 | { | |
1006 | int unit; | |
1007 | for (unit = 0; unit < PT_UNITS; unit++) | |
1008 | if (pt[unit].present) { | |
1009 | class_simple_device_remove(MKDEV(major, unit)); | |
1010 | devfs_remove("pt/%d", unit); | |
1011 | class_simple_device_remove(MKDEV(major, unit + 128)); | |
1012 | devfs_remove("pt/%dn", unit); | |
1013 | } | |
1014 | class_simple_destroy(pt_class); | |
1015 | devfs_remove("pt"); | |
1016 | unregister_chrdev(major, name); | |
1017 | for (unit = 0; unit < PT_UNITS; unit++) | |
1018 | if (pt[unit].present) | |
1019 | pi_release(pt[unit].pi); | |
1020 | } | |
1021 | ||
1022 | MODULE_LICENSE("GPL"); | |
1023 | module_init(pt_init) | |
1024 | module_exit(pt_exit) |