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1 | /* | |
2 | pf.c (c) 1997-8 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 disk | |
6 | drives based on chips supported by the paride module. | |
7 | ||
8 | By default, the driver will autoprobe for a single parallel | |
9 | port ATAPI disk drive, but if their individual parameters are | |
10 | specified, the driver can handle up to 4 drives. | |
11 | ||
12 | The behaviour of the pf driver can be altered by setting | |
13 | some parameters from the insmod command line. The following | |
14 | parameters are adjustable: | |
15 | ||
16 | drive0 These four arguments can be arrays of | |
17 | drive1 1-7 integers as follows: | |
18 | drive2 | |
19 | drive3 <prt>,<pro>,<uni>,<mod>,<slv>,<lun>,<dly> | |
20 | ||
21 | Where, | |
22 | ||
23 | <prt> is the base of the parallel port address for | |
24 | the corresponding drive. (required) | |
25 | ||
26 | <pro> is the protocol number for the adapter that | |
27 | supports this drive. These numbers are | |
28 | logged by 'paride' when the protocol modules | |
29 | are initialised. (0 if not given) | |
30 | ||
31 | <uni> for those adapters that support chained | |
32 | devices, this is the unit selector for the | |
33 | chain of devices on the given port. It should | |
34 | be zero for devices that don't support chaining. | |
35 | (0 if not given) | |
36 | ||
37 | <mod> this can be -1 to choose the best mode, or one | |
38 | of the mode numbers supported by the adapter. | |
39 | (-1 if not given) | |
40 | ||
41 | <slv> ATAPI CDroms can be jumpered to master or slave. | |
42 | Set this to 0 to choose the master drive, 1 to | |
43 | choose the slave, -1 (the default) to choose the | |
44 | first drive found. | |
45 | ||
46 | <lun> Some ATAPI devices support multiple LUNs. | |
47 | One example is the ATAPI PD/CD drive from | |
48 | Matshita/Panasonic. This device has a | |
49 | CD drive on LUN 0 and a PD drive on LUN 1. | |
50 | By default, the driver will search for the | |
51 | first LUN with a supported device. Set | |
52 | this parameter to force it to use a specific | |
53 | LUN. (default -1) | |
54 | ||
55 | <dly> some parallel ports require the driver to | |
56 | go more slowly. -1 sets a default value that | |
57 | should work with the chosen protocol. Otherwise, | |
58 | set this to a small integer, the larger it is | |
59 | the slower the port i/o. In some cases, setting | |
60 | this to zero will speed up the device. (default -1) | |
61 | ||
62 | major You may use this parameter to override the | |
63 | default major number (47) that this driver | |
64 | will use. Be sure to change the device | |
65 | name as well. | |
66 | ||
67 | name This parameter is a character string that | |
68 | contains the name the kernel will use for this | |
69 | device (in /proc output, for instance). | |
70 | (default "pf"). | |
71 | ||
72 | cluster The driver will attempt to aggregate requests | |
73 | for adjacent blocks into larger multi-block | |
74 | clusters. The maximum cluster size (in 512 | |
75 | byte sectors) is set with this parameter. | |
76 | (default 64) | |
77 | ||
78 | verbose This parameter controls the amount of logging | |
79 | that the driver will do. Set it to 0 for | |
80 | normal operation, 1 to see autoprobe progress | |
81 | messages, or 2 to see additional debugging | |
82 | output. (default 0) | |
83 | ||
84 | nice This parameter controls the driver's use of | |
85 | idle CPU time, at the expense of some speed. | |
86 | ||
87 | If this driver is built into the kernel, you can use the | |
88 | following command line parameters, with the same values | |
89 | as the corresponding module parameters listed above: | |
90 | ||
91 | pf.drive0 | |
92 | pf.drive1 | |
93 | pf.drive2 | |
94 | pf.drive3 | |
95 | pf.cluster | |
96 | pf.nice | |
97 | ||
98 | In addition, you can use the parameter pf.disable to disable | |
99 | the driver entirely. | |
100 | ||
101 | */ | |
102 | ||
103 | /* Changes: | |
104 | ||
105 | 1.01 GRG 1998.05.03 Changes for SMP. Eliminate sti(). | |
106 | Fix for drives that don't clear STAT_ERR | |
107 | until after next CDB delivered. | |
108 | Small change in pf_completion to round | |
109 | up transfer size. | |
110 | 1.02 GRG 1998.06.16 Eliminated an Ugh | |
111 | 1.03 GRG 1998.08.16 Use HZ in loop timings, extra debugging | |
112 | 1.04 GRG 1998.09.24 Added jumbo support | |
113 | ||
114 | */ | |
115 | ||
116 | #define PF_VERSION "1.04" | |
117 | #define PF_MAJOR 47 | |
118 | #define PF_NAME "pf" | |
119 | #define PF_UNITS 4 | |
120 | ||
121 | #include <linux/types.h> | |
122 | ||
123 | /* Here are things one can override from the insmod command. | |
124 | Most are autoprobed by paride unless set here. Verbose is off | |
125 | by default. | |
126 | ||
127 | */ | |
128 | ||
129 | static bool verbose = 0; | |
130 | static int major = PF_MAJOR; | |
131 | static char *name = PF_NAME; | |
132 | static int cluster = 64; | |
133 | static int nice = 0; | |
134 | static int disable = 0; | |
135 | ||
136 | static int drive0[7] = { 0, 0, 0, -1, -1, -1, -1 }; | |
137 | static int drive1[7] = { 0, 0, 0, -1, -1, -1, -1 }; | |
138 | static int drive2[7] = { 0, 0, 0, -1, -1, -1, -1 }; | |
139 | static int drive3[7] = { 0, 0, 0, -1, -1, -1, -1 }; | |
140 | ||
141 | static int (*drives[4])[7] = {&drive0, &drive1, &drive2, &drive3}; | |
142 | static int pf_drive_count; | |
143 | ||
144 | enum {D_PRT, D_PRO, D_UNI, D_MOD, D_SLV, D_LUN, D_DLY}; | |
145 | ||
146 | /* end of parameters */ | |
147 | ||
148 | #include <linux/module.h> | |
149 | #include <linux/init.h> | |
150 | #include <linux/fs.h> | |
151 | #include <linux/delay.h> | |
152 | #include <linux/hdreg.h> | |
153 | #include <linux/cdrom.h> | |
154 | #include <linux/spinlock.h> | |
155 | #include <linux/blkdev.h> | |
156 | #include <linux/blkpg.h> | |
157 | #include <linux/mutex.h> | |
158 | #include <linux/uaccess.h> | |
159 | ||
160 | static DEFINE_MUTEX(pf_mutex); | |
161 | static DEFINE_SPINLOCK(pf_spin_lock); | |
162 | ||
163 | module_param(verbose, bool, 0644); | |
164 | module_param(major, int, 0); | |
165 | module_param(name, charp, 0); | |
166 | module_param(cluster, int, 0); | |
167 | module_param(nice, int, 0); | |
168 | module_param_array(drive0, int, NULL, 0); | |
169 | module_param_array(drive1, int, NULL, 0); | |
170 | module_param_array(drive2, int, NULL, 0); | |
171 | module_param_array(drive3, int, NULL, 0); | |
172 | ||
173 | #include "paride.h" | |
174 | #include "pseudo.h" | |
175 | ||
176 | /* constants for faking geometry numbers */ | |
177 | ||
178 | #define PF_FD_MAX 8192 /* use FD geometry under this size */ | |
179 | #define PF_FD_HDS 2 | |
180 | #define PF_FD_SPT 18 | |
181 | #define PF_HD_HDS 64 | |
182 | #define PF_HD_SPT 32 | |
183 | ||
184 | #define PF_MAX_RETRIES 5 | |
185 | #define PF_TMO 800 /* interrupt timeout in jiffies */ | |
186 | #define PF_SPIN_DEL 50 /* spin delay in micro-seconds */ | |
187 | ||
188 | #define PF_SPIN (1000000*PF_TMO)/(HZ*PF_SPIN_DEL) | |
189 | ||
190 | #define STAT_ERR 0x00001 | |
191 | #define STAT_INDEX 0x00002 | |
192 | #define STAT_ECC 0x00004 | |
193 | #define STAT_DRQ 0x00008 | |
194 | #define STAT_SEEK 0x00010 | |
195 | #define STAT_WRERR 0x00020 | |
196 | #define STAT_READY 0x00040 | |
197 | #define STAT_BUSY 0x00080 | |
198 | ||
199 | #define ATAPI_REQ_SENSE 0x03 | |
200 | #define ATAPI_LOCK 0x1e | |
201 | #define ATAPI_DOOR 0x1b | |
202 | #define ATAPI_MODE_SENSE 0x5a | |
203 | #define ATAPI_CAPACITY 0x25 | |
204 | #define ATAPI_IDENTIFY 0x12 | |
205 | #define ATAPI_READ_10 0x28 | |
206 | #define ATAPI_WRITE_10 0x2a | |
207 | ||
208 | static int pf_open(struct block_device *bdev, fmode_t mode); | |
209 | static void do_pf_request(struct request_queue * q); | |
210 | static int pf_ioctl(struct block_device *bdev, fmode_t mode, | |
211 | unsigned int cmd, unsigned long arg); | |
212 | static int pf_getgeo(struct block_device *bdev, struct hd_geometry *geo); | |
213 | ||
214 | static void pf_release(struct gendisk *disk, fmode_t mode); | |
215 | ||
216 | static int pf_detect(void); | |
217 | static void do_pf_read(void); | |
218 | static void do_pf_read_start(void); | |
219 | static void do_pf_write(void); | |
220 | static void do_pf_write_start(void); | |
221 | static void do_pf_read_drq(void); | |
222 | static void do_pf_write_done(void); | |
223 | ||
224 | #define PF_NM 0 | |
225 | #define PF_RO 1 | |
226 | #define PF_RW 2 | |
227 | ||
228 | #define PF_NAMELEN 8 | |
229 | ||
230 | struct pf_unit { | |
231 | struct pi_adapter pia; /* interface to paride layer */ | |
232 | struct pi_adapter *pi; | |
233 | int removable; /* removable media device ? */ | |
234 | int media_status; /* media present ? WP ? */ | |
235 | int drive; /* drive */ | |
236 | int lun; | |
237 | int access; /* count of active opens ... */ | |
238 | int present; /* device present ? */ | |
239 | char name[PF_NAMELEN]; /* pf0, pf1, ... */ | |
240 | struct gendisk *disk; | |
241 | }; | |
242 | ||
243 | static struct pf_unit units[PF_UNITS]; | |
244 | ||
245 | static int pf_identify(struct pf_unit *pf); | |
246 | static void pf_lock(struct pf_unit *pf, int func); | |
247 | static void pf_eject(struct pf_unit *pf); | |
248 | static unsigned int pf_check_events(struct gendisk *disk, | |
249 | unsigned int clearing); | |
250 | ||
251 | static char pf_scratch[512]; /* scratch block buffer */ | |
252 | ||
253 | /* the variables below are used mainly in the I/O request engine, which | |
254 | processes only one request at a time. | |
255 | */ | |
256 | ||
257 | static int pf_retries = 0; /* i/o error retry count */ | |
258 | static int pf_busy = 0; /* request being processed ? */ | |
259 | static struct request *pf_req; /* current request */ | |
260 | static int pf_block; /* address of next requested block */ | |
261 | static int pf_count; /* number of blocks still to do */ | |
262 | static int pf_run; /* sectors in current cluster */ | |
263 | static int pf_cmd; /* current command READ/WRITE */ | |
264 | static struct pf_unit *pf_current;/* unit of current request */ | |
265 | static int pf_mask; /* stopper for pseudo-int */ | |
266 | static char *pf_buf; /* buffer for request in progress */ | |
267 | static void *par_drv; /* reference of parport driver */ | |
268 | ||
269 | /* kernel glue structures */ | |
270 | ||
271 | static const struct block_device_operations pf_fops = { | |
272 | .owner = THIS_MODULE, | |
273 | .open = pf_open, | |
274 | .release = pf_release, | |
275 | .ioctl = pf_ioctl, | |
276 | .getgeo = pf_getgeo, | |
277 | .check_events = pf_check_events, | |
278 | }; | |
279 | ||
280 | static void __init pf_init_units(void) | |
281 | { | |
282 | struct pf_unit *pf; | |
283 | int unit; | |
284 | ||
285 | pf_drive_count = 0; | |
286 | for (unit = 0, pf = units; unit < PF_UNITS; unit++, pf++) { | |
287 | struct gendisk *disk = alloc_disk(1); | |
288 | if (!disk) | |
289 | continue; | |
290 | disk->queue = blk_init_queue(do_pf_request, &pf_spin_lock); | |
291 | if (!disk->queue) { | |
292 | put_disk(disk); | |
293 | return; | |
294 | } | |
295 | blk_queue_max_segments(disk->queue, cluster); | |
296 | blk_queue_bounce_limit(disk->queue, BLK_BOUNCE_HIGH); | |
297 | pf->disk = disk; | |
298 | pf->pi = &pf->pia; | |
299 | pf->media_status = PF_NM; | |
300 | pf->drive = (*drives[unit])[D_SLV]; | |
301 | pf->lun = (*drives[unit])[D_LUN]; | |
302 | snprintf(pf->name, PF_NAMELEN, "%s%d", name, unit); | |
303 | disk->major = major; | |
304 | disk->first_minor = unit; | |
305 | strcpy(disk->disk_name, pf->name); | |
306 | disk->fops = &pf_fops; | |
307 | if (!(*drives[unit])[D_PRT]) | |
308 | pf_drive_count++; | |
309 | } | |
310 | } | |
311 | ||
312 | static int pf_open(struct block_device *bdev, fmode_t mode) | |
313 | { | |
314 | struct pf_unit *pf = bdev->bd_disk->private_data; | |
315 | int ret; | |
316 | ||
317 | mutex_lock(&pf_mutex); | |
318 | pf_identify(pf); | |
319 | ||
320 | ret = -ENODEV; | |
321 | if (pf->media_status == PF_NM) | |
322 | goto out; | |
323 | ||
324 | ret = -EROFS; | |
325 | if ((pf->media_status == PF_RO) && (mode & FMODE_WRITE)) | |
326 | goto out; | |
327 | ||
328 | ret = 0; | |
329 | pf->access++; | |
330 | if (pf->removable) | |
331 | pf_lock(pf, 1); | |
332 | out: | |
333 | mutex_unlock(&pf_mutex); | |
334 | return ret; | |
335 | } | |
336 | ||
337 | static int pf_getgeo(struct block_device *bdev, struct hd_geometry *geo) | |
338 | { | |
339 | struct pf_unit *pf = bdev->bd_disk->private_data; | |
340 | sector_t capacity = get_capacity(pf->disk); | |
341 | ||
342 | if (capacity < PF_FD_MAX) { | |
343 | geo->cylinders = sector_div(capacity, PF_FD_HDS * PF_FD_SPT); | |
344 | geo->heads = PF_FD_HDS; | |
345 | geo->sectors = PF_FD_SPT; | |
346 | } else { | |
347 | geo->cylinders = sector_div(capacity, PF_HD_HDS * PF_HD_SPT); | |
348 | geo->heads = PF_HD_HDS; | |
349 | geo->sectors = PF_HD_SPT; | |
350 | } | |
351 | ||
352 | return 0; | |
353 | } | |
354 | ||
355 | static int pf_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd, unsigned long arg) | |
356 | { | |
357 | struct pf_unit *pf = bdev->bd_disk->private_data; | |
358 | ||
359 | if (cmd != CDROMEJECT) | |
360 | return -EINVAL; | |
361 | ||
362 | if (pf->access != 1) | |
363 | return -EBUSY; | |
364 | mutex_lock(&pf_mutex); | |
365 | pf_eject(pf); | |
366 | mutex_unlock(&pf_mutex); | |
367 | ||
368 | return 0; | |
369 | } | |
370 | ||
371 | static void pf_release(struct gendisk *disk, fmode_t mode) | |
372 | { | |
373 | struct pf_unit *pf = disk->private_data; | |
374 | ||
375 | mutex_lock(&pf_mutex); | |
376 | if (pf->access <= 0) { | |
377 | mutex_unlock(&pf_mutex); | |
378 | WARN_ON(1); | |
379 | return; | |
380 | } | |
381 | ||
382 | pf->access--; | |
383 | ||
384 | if (!pf->access && pf->removable) | |
385 | pf_lock(pf, 0); | |
386 | ||
387 | mutex_unlock(&pf_mutex); | |
388 | } | |
389 | ||
390 | static unsigned int pf_check_events(struct gendisk *disk, unsigned int clearing) | |
391 | { | |
392 | return DISK_EVENT_MEDIA_CHANGE; | |
393 | } | |
394 | ||
395 | static inline int status_reg(struct pf_unit *pf) | |
396 | { | |
397 | return pi_read_regr(pf->pi, 1, 6); | |
398 | } | |
399 | ||
400 | static inline int read_reg(struct pf_unit *pf, int reg) | |
401 | { | |
402 | return pi_read_regr(pf->pi, 0, reg); | |
403 | } | |
404 | ||
405 | static inline void write_reg(struct pf_unit *pf, int reg, int val) | |
406 | { | |
407 | pi_write_regr(pf->pi, 0, reg, val); | |
408 | } | |
409 | ||
410 | static int pf_wait(struct pf_unit *pf, int go, int stop, char *fun, char *msg) | |
411 | { | |
412 | int j, r, e, s, p; | |
413 | ||
414 | j = 0; | |
415 | while ((((r = status_reg(pf)) & go) || (stop && (!(r & stop)))) | |
416 | && (j++ < PF_SPIN)) | |
417 | udelay(PF_SPIN_DEL); | |
418 | ||
419 | if ((r & (STAT_ERR & stop)) || (j > PF_SPIN)) { | |
420 | s = read_reg(pf, 7); | |
421 | e = read_reg(pf, 1); | |
422 | p = read_reg(pf, 2); | |
423 | if (j > PF_SPIN) | |
424 | e |= 0x100; | |
425 | if (fun) | |
426 | printk("%s: %s %s: alt=0x%x stat=0x%x err=0x%x" | |
427 | " loop=%d phase=%d\n", | |
428 | pf->name, fun, msg, r, s, e, j, p); | |
429 | return (e << 8) + s; | |
430 | } | |
431 | return 0; | |
432 | } | |
433 | ||
434 | static int pf_command(struct pf_unit *pf, char *cmd, int dlen, char *fun) | |
435 | { | |
436 | pi_connect(pf->pi); | |
437 | ||
438 | write_reg(pf, 6, 0xa0+0x10*pf->drive); | |
439 | ||
440 | if (pf_wait(pf, STAT_BUSY | STAT_DRQ, 0, fun, "before command")) { | |
441 | pi_disconnect(pf->pi); | |
442 | return -1; | |
443 | } | |
444 | ||
445 | write_reg(pf, 4, dlen % 256); | |
446 | write_reg(pf, 5, dlen / 256); | |
447 | write_reg(pf, 7, 0xa0); /* ATAPI packet command */ | |
448 | ||
449 | if (pf_wait(pf, STAT_BUSY, STAT_DRQ, fun, "command DRQ")) { | |
450 | pi_disconnect(pf->pi); | |
451 | return -1; | |
452 | } | |
453 | ||
454 | if (read_reg(pf, 2) != 1) { | |
455 | printk("%s: %s: command phase error\n", pf->name, fun); | |
456 | pi_disconnect(pf->pi); | |
457 | return -1; | |
458 | } | |
459 | ||
460 | pi_write_block(pf->pi, cmd, 12); | |
461 | ||
462 | return 0; | |
463 | } | |
464 | ||
465 | static int pf_completion(struct pf_unit *pf, char *buf, char *fun) | |
466 | { | |
467 | int r, s, n; | |
468 | ||
469 | r = pf_wait(pf, STAT_BUSY, STAT_DRQ | STAT_READY | STAT_ERR, | |
470 | fun, "completion"); | |
471 | ||
472 | if ((read_reg(pf, 2) & 2) && (read_reg(pf, 7) & STAT_DRQ)) { | |
473 | n = (((read_reg(pf, 4) + 256 * read_reg(pf, 5)) + | |
474 | 3) & 0xfffc); | |
475 | pi_read_block(pf->pi, buf, n); | |
476 | } | |
477 | ||
478 | s = pf_wait(pf, STAT_BUSY, STAT_READY | STAT_ERR, fun, "data done"); | |
479 | ||
480 | pi_disconnect(pf->pi); | |
481 | ||
482 | return (r ? r : s); | |
483 | } | |
484 | ||
485 | static void pf_req_sense(struct pf_unit *pf, int quiet) | |
486 | { | |
487 | char rs_cmd[12] = | |
488 | { ATAPI_REQ_SENSE, pf->lun << 5, 0, 0, 16, 0, 0, 0, 0, 0, 0, 0 }; | |
489 | char buf[16]; | |
490 | int r; | |
491 | ||
492 | r = pf_command(pf, rs_cmd, 16, "Request sense"); | |
493 | mdelay(1); | |
494 | if (!r) | |
495 | pf_completion(pf, buf, "Request sense"); | |
496 | ||
497 | if ((!r) && (!quiet)) | |
498 | printk("%s: Sense key: %x, ASC: %x, ASQ: %x\n", | |
499 | pf->name, buf[2] & 0xf, buf[12], buf[13]); | |
500 | } | |
501 | ||
502 | static int pf_atapi(struct pf_unit *pf, char *cmd, int dlen, char *buf, char *fun) | |
503 | { | |
504 | int r; | |
505 | ||
506 | r = pf_command(pf, cmd, dlen, fun); | |
507 | mdelay(1); | |
508 | if (!r) | |
509 | r = pf_completion(pf, buf, fun); | |
510 | if (r) | |
511 | pf_req_sense(pf, !fun); | |
512 | ||
513 | return r; | |
514 | } | |
515 | ||
516 | static void pf_lock(struct pf_unit *pf, int func) | |
517 | { | |
518 | char lo_cmd[12] = { ATAPI_LOCK, pf->lun << 5, 0, 0, func, 0, 0, 0, 0, 0, 0, 0 }; | |
519 | ||
520 | pf_atapi(pf, lo_cmd, 0, pf_scratch, func ? "lock" : "unlock"); | |
521 | } | |
522 | ||
523 | static void pf_eject(struct pf_unit *pf) | |
524 | { | |
525 | char ej_cmd[12] = { ATAPI_DOOR, pf->lun << 5, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0 }; | |
526 | ||
527 | pf_lock(pf, 0); | |
528 | pf_atapi(pf, ej_cmd, 0, pf_scratch, "eject"); | |
529 | } | |
530 | ||
531 | #define PF_RESET_TMO 30 /* in tenths of a second */ | |
532 | ||
533 | static void pf_sleep(int cs) | |
534 | { | |
535 | schedule_timeout_interruptible(cs); | |
536 | } | |
537 | ||
538 | /* the ATAPI standard actually specifies the contents of all 7 registers | |
539 | after a reset, but the specification is ambiguous concerning the last | |
540 | two bytes, and different drives interpret the standard differently. | |
541 | */ | |
542 | ||
543 | static int pf_reset(struct pf_unit *pf) | |
544 | { | |
545 | int i, k, flg; | |
546 | int expect[5] = { 1, 1, 1, 0x14, 0xeb }; | |
547 | ||
548 | pi_connect(pf->pi); | |
549 | write_reg(pf, 6, 0xa0+0x10*pf->drive); | |
550 | write_reg(pf, 7, 8); | |
551 | ||
552 | pf_sleep(20 * HZ / 1000); | |
553 | ||
554 | k = 0; | |
555 | while ((k++ < PF_RESET_TMO) && (status_reg(pf) & STAT_BUSY)) | |
556 | pf_sleep(HZ / 10); | |
557 | ||
558 | flg = 1; | |
559 | for (i = 0; i < 5; i++) | |
560 | flg &= (read_reg(pf, i + 1) == expect[i]); | |
561 | ||
562 | if (verbose) { | |
563 | printk("%s: Reset (%d) signature = ", pf->name, k); | |
564 | for (i = 0; i < 5; i++) | |
565 | printk("%3x", read_reg(pf, i + 1)); | |
566 | if (!flg) | |
567 | printk(" (incorrect)"); | |
568 | printk("\n"); | |
569 | } | |
570 | ||
571 | pi_disconnect(pf->pi); | |
572 | return flg - 1; | |
573 | } | |
574 | ||
575 | static void pf_mode_sense(struct pf_unit *pf) | |
576 | { | |
577 | char ms_cmd[12] = | |
578 | { ATAPI_MODE_SENSE, pf->lun << 5, 0, 0, 0, 0, 0, 0, 8, 0, 0, 0 }; | |
579 | char buf[8]; | |
580 | ||
581 | pf_atapi(pf, ms_cmd, 8, buf, "mode sense"); | |
582 | pf->media_status = PF_RW; | |
583 | if (buf[3] & 0x80) | |
584 | pf->media_status = PF_RO; | |
585 | } | |
586 | ||
587 | static void xs(char *buf, char *targ, int offs, int len) | |
588 | { | |
589 | int j, k, l; | |
590 | ||
591 | j = 0; | |
592 | l = 0; | |
593 | for (k = 0; k < len; k++) | |
594 | if ((buf[k + offs] != 0x20) || (buf[k + offs] != l)) | |
595 | l = targ[j++] = buf[k + offs]; | |
596 | if (l == 0x20) | |
597 | j--; | |
598 | targ[j] = 0; | |
599 | } | |
600 | ||
601 | static int xl(char *buf, int offs) | |
602 | { | |
603 | int v, k; | |
604 | ||
605 | v = 0; | |
606 | for (k = 0; k < 4; k++) | |
607 | v = v * 256 + (buf[k + offs] & 0xff); | |
608 | return v; | |
609 | } | |
610 | ||
611 | static void pf_get_capacity(struct pf_unit *pf) | |
612 | { | |
613 | char rc_cmd[12] = { ATAPI_CAPACITY, pf->lun << 5, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }; | |
614 | char buf[8]; | |
615 | int bs; | |
616 | ||
617 | if (pf_atapi(pf, rc_cmd, 8, buf, "get capacity")) { | |
618 | pf->media_status = PF_NM; | |
619 | return; | |
620 | } | |
621 | set_capacity(pf->disk, xl(buf, 0) + 1); | |
622 | bs = xl(buf, 4); | |
623 | if (bs != 512) { | |
624 | set_capacity(pf->disk, 0); | |
625 | if (verbose) | |
626 | printk("%s: Drive %d, LUN %d," | |
627 | " unsupported block size %d\n", | |
628 | pf->name, pf->drive, pf->lun, bs); | |
629 | } | |
630 | } | |
631 | ||
632 | static int pf_identify(struct pf_unit *pf) | |
633 | { | |
634 | int dt, s; | |
635 | char *ms[2] = { "master", "slave" }; | |
636 | char mf[10], id[18]; | |
637 | char id_cmd[12] = | |
638 | { ATAPI_IDENTIFY, pf->lun << 5, 0, 0, 36, 0, 0, 0, 0, 0, 0, 0 }; | |
639 | char buf[36]; | |
640 | ||
641 | s = pf_atapi(pf, id_cmd, 36, buf, "identify"); | |
642 | if (s) | |
643 | return -1; | |
644 | ||
645 | dt = buf[0] & 0x1f; | |
646 | if ((dt != 0) && (dt != 7)) { | |
647 | if (verbose) | |
648 | printk("%s: Drive %d, LUN %d, unsupported type %d\n", | |
649 | pf->name, pf->drive, pf->lun, dt); | |
650 | return -1; | |
651 | } | |
652 | ||
653 | xs(buf, mf, 8, 8); | |
654 | xs(buf, id, 16, 16); | |
655 | ||
656 | pf->removable = (buf[1] & 0x80); | |
657 | ||
658 | pf_mode_sense(pf); | |
659 | pf_mode_sense(pf); | |
660 | pf_mode_sense(pf); | |
661 | ||
662 | pf_get_capacity(pf); | |
663 | ||
664 | printk("%s: %s %s, %s LUN %d, type %d", | |
665 | pf->name, mf, id, ms[pf->drive], pf->lun, dt); | |
666 | if (pf->removable) | |
667 | printk(", removable"); | |
668 | if (pf->media_status == PF_NM) | |
669 | printk(", no media\n"); | |
670 | else { | |
671 | if (pf->media_status == PF_RO) | |
672 | printk(", RO"); | |
673 | printk(", %llu blocks\n", | |
674 | (unsigned long long)get_capacity(pf->disk)); | |
675 | } | |
676 | return 0; | |
677 | } | |
678 | ||
679 | /* returns 0, with id set if drive is detected | |
680 | -1, if drive detection failed | |
681 | */ | |
682 | static int pf_probe(struct pf_unit *pf) | |
683 | { | |
684 | if (pf->drive == -1) { | |
685 | for (pf->drive = 0; pf->drive <= 1; pf->drive++) | |
686 | if (!pf_reset(pf)) { | |
687 | if (pf->lun != -1) | |
688 | return pf_identify(pf); | |
689 | else | |
690 | for (pf->lun = 0; pf->lun < 8; pf->lun++) | |
691 | if (!pf_identify(pf)) | |
692 | return 0; | |
693 | } | |
694 | } else { | |
695 | if (pf_reset(pf)) | |
696 | return -1; | |
697 | if (pf->lun != -1) | |
698 | return pf_identify(pf); | |
699 | for (pf->lun = 0; pf->lun < 8; pf->lun++) | |
700 | if (!pf_identify(pf)) | |
701 | return 0; | |
702 | } | |
703 | return -1; | |
704 | } | |
705 | ||
706 | static int pf_detect(void) | |
707 | { | |
708 | struct pf_unit *pf = units; | |
709 | int k, unit; | |
710 | ||
711 | printk("%s: %s version %s, major %d, cluster %d, nice %d\n", | |
712 | name, name, PF_VERSION, major, cluster, nice); | |
713 | ||
714 | par_drv = pi_register_driver(name); | |
715 | if (!par_drv) { | |
716 | pr_err("failed to register %s driver\n", name); | |
717 | return -1; | |
718 | } | |
719 | k = 0; | |
720 | if (pf_drive_count == 0) { | |
721 | if (pi_init(pf->pi, 1, -1, -1, -1, -1, -1, pf_scratch, PI_PF, | |
722 | verbose, pf->name)) { | |
723 | if (!pf_probe(pf) && pf->disk) { | |
724 | pf->present = 1; | |
725 | k++; | |
726 | } else | |
727 | pi_release(pf->pi); | |
728 | } | |
729 | ||
730 | } else | |
731 | for (unit = 0; unit < PF_UNITS; unit++, pf++) { | |
732 | int *conf = *drives[unit]; | |
733 | if (!conf[D_PRT]) | |
734 | continue; | |
735 | if (pi_init(pf->pi, 0, conf[D_PRT], conf[D_MOD], | |
736 | conf[D_UNI], conf[D_PRO], conf[D_DLY], | |
737 | pf_scratch, PI_PF, verbose, pf->name)) { | |
738 | if (pf->disk && !pf_probe(pf)) { | |
739 | pf->present = 1; | |
740 | k++; | |
741 | } else | |
742 | pi_release(pf->pi); | |
743 | } | |
744 | } | |
745 | if (k) | |
746 | return 0; | |
747 | ||
748 | printk("%s: No ATAPI disk detected\n", name); | |
749 | for (pf = units, unit = 0; unit < PF_UNITS; pf++, unit++) | |
750 | put_disk(pf->disk); | |
751 | pi_unregister_driver(par_drv); | |
752 | return -1; | |
753 | } | |
754 | ||
755 | /* The i/o request engine */ | |
756 | ||
757 | static int pf_start(struct pf_unit *pf, int cmd, int b, int c) | |
758 | { | |
759 | int i; | |
760 | char io_cmd[12] = { cmd, pf->lun << 5, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }; | |
761 | ||
762 | for (i = 0; i < 4; i++) { | |
763 | io_cmd[5 - i] = b & 0xff; | |
764 | b = b >> 8; | |
765 | } | |
766 | ||
767 | io_cmd[8] = c & 0xff; | |
768 | io_cmd[7] = (c >> 8) & 0xff; | |
769 | ||
770 | i = pf_command(pf, io_cmd, c * 512, "start i/o"); | |
771 | ||
772 | mdelay(1); | |
773 | ||
774 | return i; | |
775 | } | |
776 | ||
777 | static int pf_ready(void) | |
778 | { | |
779 | return (((status_reg(pf_current) & (STAT_BUSY | pf_mask)) == pf_mask)); | |
780 | } | |
781 | ||
782 | static int pf_queue; | |
783 | ||
784 | static int set_next_request(void) | |
785 | { | |
786 | struct pf_unit *pf; | |
787 | struct request_queue *q; | |
788 | int old_pos = pf_queue; | |
789 | ||
790 | do { | |
791 | pf = &units[pf_queue]; | |
792 | q = pf->present ? pf->disk->queue : NULL; | |
793 | if (++pf_queue == PF_UNITS) | |
794 | pf_queue = 0; | |
795 | if (q) { | |
796 | pf_req = blk_fetch_request(q); | |
797 | if (pf_req) | |
798 | break; | |
799 | } | |
800 | } while (pf_queue != old_pos); | |
801 | ||
802 | return pf_req != NULL; | |
803 | } | |
804 | ||
805 | static void pf_end_request(blk_status_t err) | |
806 | { | |
807 | if (pf_req && !__blk_end_request_cur(pf_req, err)) | |
808 | pf_req = NULL; | |
809 | } | |
810 | ||
811 | static void pf_request(void) | |
812 | { | |
813 | if (pf_busy) | |
814 | return; | |
815 | repeat: | |
816 | if (!pf_req && !set_next_request()) | |
817 | return; | |
818 | ||
819 | pf_current = pf_req->rq_disk->private_data; | |
820 | pf_block = blk_rq_pos(pf_req); | |
821 | pf_run = blk_rq_sectors(pf_req); | |
822 | pf_count = blk_rq_cur_sectors(pf_req); | |
823 | ||
824 | if (pf_block + pf_count > get_capacity(pf_req->rq_disk)) { | |
825 | pf_end_request(BLK_STS_IOERR); | |
826 | goto repeat; | |
827 | } | |
828 | ||
829 | pf_cmd = rq_data_dir(pf_req); | |
830 | pf_buf = bio_data(pf_req->bio); | |
831 | pf_retries = 0; | |
832 | ||
833 | pf_busy = 1; | |
834 | if (pf_cmd == READ) | |
835 | pi_do_claimed(pf_current->pi, do_pf_read); | |
836 | else if (pf_cmd == WRITE) | |
837 | pi_do_claimed(pf_current->pi, do_pf_write); | |
838 | else { | |
839 | pf_busy = 0; | |
840 | pf_end_request(BLK_STS_IOERR); | |
841 | goto repeat; | |
842 | } | |
843 | } | |
844 | ||
845 | static void do_pf_request(struct request_queue *q) | |
846 | { | |
847 | pf_request(); | |
848 | } | |
849 | ||
850 | static int pf_next_buf(void) | |
851 | { | |
852 | unsigned long saved_flags; | |
853 | ||
854 | pf_count--; | |
855 | pf_run--; | |
856 | pf_buf += 512; | |
857 | pf_block++; | |
858 | if (!pf_run) | |
859 | return 1; | |
860 | if (!pf_count) { | |
861 | spin_lock_irqsave(&pf_spin_lock, saved_flags); | |
862 | pf_end_request(0); | |
863 | spin_unlock_irqrestore(&pf_spin_lock, saved_flags); | |
864 | if (!pf_req) | |
865 | return 1; | |
866 | pf_count = blk_rq_cur_sectors(pf_req); | |
867 | pf_buf = bio_data(pf_req->bio); | |
868 | } | |
869 | return 0; | |
870 | } | |
871 | ||
872 | static inline void next_request(blk_status_t err) | |
873 | { | |
874 | unsigned long saved_flags; | |
875 | ||
876 | spin_lock_irqsave(&pf_spin_lock, saved_flags); | |
877 | pf_end_request(err); | |
878 | pf_busy = 0; | |
879 | pf_request(); | |
880 | spin_unlock_irqrestore(&pf_spin_lock, saved_flags); | |
881 | } | |
882 | ||
883 | /* detach from the calling context - in case the spinlock is held */ | |
884 | static void do_pf_read(void) | |
885 | { | |
886 | ps_set_intr(do_pf_read_start, NULL, 0, nice); | |
887 | } | |
888 | ||
889 | static void do_pf_read_start(void) | |
890 | { | |
891 | pf_busy = 1; | |
892 | ||
893 | if (pf_start(pf_current, ATAPI_READ_10, pf_block, pf_run)) { | |
894 | pi_disconnect(pf_current->pi); | |
895 | if (pf_retries < PF_MAX_RETRIES) { | |
896 | pf_retries++; | |
897 | pi_do_claimed(pf_current->pi, do_pf_read_start); | |
898 | return; | |
899 | } | |
900 | next_request(BLK_STS_IOERR); | |
901 | return; | |
902 | } | |
903 | pf_mask = STAT_DRQ; | |
904 | ps_set_intr(do_pf_read_drq, pf_ready, PF_TMO, nice); | |
905 | } | |
906 | ||
907 | static void do_pf_read_drq(void) | |
908 | { | |
909 | while (1) { | |
910 | if (pf_wait(pf_current, STAT_BUSY, STAT_DRQ | STAT_ERR, | |
911 | "read block", "completion") & STAT_ERR) { | |
912 | pi_disconnect(pf_current->pi); | |
913 | if (pf_retries < PF_MAX_RETRIES) { | |
914 | pf_req_sense(pf_current, 0); | |
915 | pf_retries++; | |
916 | pi_do_claimed(pf_current->pi, do_pf_read_start); | |
917 | return; | |
918 | } | |
919 | next_request(BLK_STS_IOERR); | |
920 | return; | |
921 | } | |
922 | pi_read_block(pf_current->pi, pf_buf, 512); | |
923 | if (pf_next_buf()) | |
924 | break; | |
925 | } | |
926 | pi_disconnect(pf_current->pi); | |
927 | next_request(0); | |
928 | } | |
929 | ||
930 | static void do_pf_write(void) | |
931 | { | |
932 | ps_set_intr(do_pf_write_start, NULL, 0, nice); | |
933 | } | |
934 | ||
935 | static void do_pf_write_start(void) | |
936 | { | |
937 | pf_busy = 1; | |
938 | ||
939 | if (pf_start(pf_current, ATAPI_WRITE_10, pf_block, pf_run)) { | |
940 | pi_disconnect(pf_current->pi); | |
941 | if (pf_retries < PF_MAX_RETRIES) { | |
942 | pf_retries++; | |
943 | pi_do_claimed(pf_current->pi, do_pf_write_start); | |
944 | return; | |
945 | } | |
946 | next_request(BLK_STS_IOERR); | |
947 | return; | |
948 | } | |
949 | ||
950 | while (1) { | |
951 | if (pf_wait(pf_current, STAT_BUSY, STAT_DRQ | STAT_ERR, | |
952 | "write block", "data wait") & STAT_ERR) { | |
953 | pi_disconnect(pf_current->pi); | |
954 | if (pf_retries < PF_MAX_RETRIES) { | |
955 | pf_retries++; | |
956 | pi_do_claimed(pf_current->pi, do_pf_write_start); | |
957 | return; | |
958 | } | |
959 | next_request(BLK_STS_IOERR); | |
960 | return; | |
961 | } | |
962 | pi_write_block(pf_current->pi, pf_buf, 512); | |
963 | if (pf_next_buf()) | |
964 | break; | |
965 | } | |
966 | pf_mask = 0; | |
967 | ps_set_intr(do_pf_write_done, pf_ready, PF_TMO, nice); | |
968 | } | |
969 | ||
970 | static void do_pf_write_done(void) | |
971 | { | |
972 | if (pf_wait(pf_current, STAT_BUSY, 0, "write block", "done") & STAT_ERR) { | |
973 | pi_disconnect(pf_current->pi); | |
974 | if (pf_retries < PF_MAX_RETRIES) { | |
975 | pf_retries++; | |
976 | pi_do_claimed(pf_current->pi, do_pf_write_start); | |
977 | return; | |
978 | } | |
979 | next_request(BLK_STS_IOERR); | |
980 | return; | |
981 | } | |
982 | pi_disconnect(pf_current->pi); | |
983 | next_request(0); | |
984 | } | |
985 | ||
986 | static int __init pf_init(void) | |
987 | { /* preliminary initialisation */ | |
988 | struct pf_unit *pf; | |
989 | int unit; | |
990 | ||
991 | if (disable) | |
992 | return -EINVAL; | |
993 | ||
994 | pf_init_units(); | |
995 | ||
996 | if (pf_detect()) | |
997 | return -ENODEV; | |
998 | pf_busy = 0; | |
999 | ||
1000 | if (register_blkdev(major, name)) { | |
1001 | for (pf = units, unit = 0; unit < PF_UNITS; pf++, unit++) | |
1002 | put_disk(pf->disk); | |
1003 | return -EBUSY; | |
1004 | } | |
1005 | ||
1006 | for (pf = units, unit = 0; unit < PF_UNITS; pf++, unit++) { | |
1007 | struct gendisk *disk = pf->disk; | |
1008 | ||
1009 | if (!pf->present) | |
1010 | continue; | |
1011 | disk->private_data = pf; | |
1012 | add_disk(disk); | |
1013 | } | |
1014 | return 0; | |
1015 | } | |
1016 | ||
1017 | static void __exit pf_exit(void) | |
1018 | { | |
1019 | struct pf_unit *pf; | |
1020 | int unit; | |
1021 | unregister_blkdev(major, name); | |
1022 | for (pf = units, unit = 0; unit < PF_UNITS; pf++, unit++) { | |
1023 | if (!pf->present) | |
1024 | continue; | |
1025 | del_gendisk(pf->disk); | |
1026 | blk_cleanup_queue(pf->disk->queue); | |
1027 | put_disk(pf->disk); | |
1028 | pi_release(pf->pi); | |
1029 | } | |
1030 | } | |
1031 | ||
1032 | MODULE_LICENSE("GPL"); | |
1033 | module_init(pf_init) | |
1034 | module_exit(pf_exit) |