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1da177e4 LT |
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 overide 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 | /* Here are things one can override from the insmod command. | |
122 | Most are autoprobed by paride unless set here. Verbose is off | |
123 | by default. | |
124 | ||
125 | */ | |
126 | ||
127 | static int verbose = 0; | |
128 | static int major = PF_MAJOR; | |
129 | static char *name = PF_NAME; | |
130 | static int cluster = 64; | |
131 | static int nice = 0; | |
132 | static int disable = 0; | |
133 | ||
134 | static int drive0[7] = { 0, 0, 0, -1, -1, -1, -1 }; | |
135 | static int drive1[7] = { 0, 0, 0, -1, -1, -1, -1 }; | |
136 | static int drive2[7] = { 0, 0, 0, -1, -1, -1, -1 }; | |
137 | static int drive3[7] = { 0, 0, 0, -1, -1, -1, -1 }; | |
138 | ||
139 | static int (*drives[4])[7] = {&drive0, &drive1, &drive2, &drive3}; | |
140 | static int pf_drive_count; | |
141 | ||
142 | enum {D_PRT, D_PRO, D_UNI, D_MOD, D_SLV, D_LUN, D_DLY}; | |
143 | ||
144 | /* end of parameters */ | |
145 | ||
146 | #include <linux/module.h> | |
147 | #include <linux/init.h> | |
148 | #include <linux/fs.h> | |
149 | #include <linux/delay.h> | |
150 | #include <linux/hdreg.h> | |
151 | #include <linux/cdrom.h> | |
152 | #include <linux/spinlock.h> | |
153 | #include <linux/blkdev.h> | |
154 | #include <linux/blkpg.h> | |
155 | #include <asm/uaccess.h> | |
156 | ||
157 | static spinlock_t pf_spin_lock; | |
158 | ||
159 | module_param(verbose, bool, 0644); | |
160 | module_param(major, int, 0); | |
161 | module_param(name, charp, 0); | |
162 | module_param(cluster, int, 0); | |
163 | module_param(nice, int, 0); | |
164 | module_param_array(drive0, int, NULL, 0); | |
165 | module_param_array(drive1, int, NULL, 0); | |
166 | module_param_array(drive2, int, NULL, 0); | |
167 | module_param_array(drive3, int, NULL, 0); | |
168 | ||
169 | #include "paride.h" | |
170 | #include "pseudo.h" | |
171 | ||
172 | /* constants for faking geometry numbers */ | |
173 | ||
174 | #define PF_FD_MAX 8192 /* use FD geometry under this size */ | |
175 | #define PF_FD_HDS 2 | |
176 | #define PF_FD_SPT 18 | |
177 | #define PF_HD_HDS 64 | |
178 | #define PF_HD_SPT 32 | |
179 | ||
180 | #define PF_MAX_RETRIES 5 | |
181 | #define PF_TMO 800 /* interrupt timeout in jiffies */ | |
182 | #define PF_SPIN_DEL 50 /* spin delay in micro-seconds */ | |
183 | ||
184 | #define PF_SPIN (1000000*PF_TMO)/(HZ*PF_SPIN_DEL) | |
185 | ||
186 | #define STAT_ERR 0x00001 | |
187 | #define STAT_INDEX 0x00002 | |
188 | #define STAT_ECC 0x00004 | |
189 | #define STAT_DRQ 0x00008 | |
190 | #define STAT_SEEK 0x00010 | |
191 | #define STAT_WRERR 0x00020 | |
192 | #define STAT_READY 0x00040 | |
193 | #define STAT_BUSY 0x00080 | |
194 | ||
195 | #define ATAPI_REQ_SENSE 0x03 | |
196 | #define ATAPI_LOCK 0x1e | |
197 | #define ATAPI_DOOR 0x1b | |
198 | #define ATAPI_MODE_SENSE 0x5a | |
199 | #define ATAPI_CAPACITY 0x25 | |
200 | #define ATAPI_IDENTIFY 0x12 | |
201 | #define ATAPI_READ_10 0x28 | |
202 | #define ATAPI_WRITE_10 0x2a | |
203 | ||
204 | static int pf_open(struct inode *inode, struct file *file); | |
205 | static void do_pf_request(request_queue_t * q); | |
206 | static int pf_ioctl(struct inode *inode, struct file *file, | |
207 | unsigned int cmd, unsigned long arg); | |
208 | ||
209 | static int pf_release(struct inode *inode, struct file *file); | |
210 | ||
211 | static int pf_detect(void); | |
212 | static void do_pf_read(void); | |
213 | static void do_pf_read_start(void); | |
214 | static void do_pf_write(void); | |
215 | static void do_pf_write_start(void); | |
216 | static void do_pf_read_drq(void); | |
217 | static void do_pf_write_done(void); | |
218 | ||
219 | #define PF_NM 0 | |
220 | #define PF_RO 1 | |
221 | #define PF_RW 2 | |
222 | ||
223 | #define PF_NAMELEN 8 | |
224 | ||
225 | struct pf_unit { | |
226 | struct pi_adapter pia; /* interface to paride layer */ | |
227 | struct pi_adapter *pi; | |
228 | int removable; /* removable media device ? */ | |
229 | int media_status; /* media present ? WP ? */ | |
230 | int drive; /* drive */ | |
231 | int lun; | |
232 | int access; /* count of active opens ... */ | |
233 | int present; /* device present ? */ | |
234 | char name[PF_NAMELEN]; /* pf0, pf1, ... */ | |
235 | struct gendisk *disk; | |
236 | }; | |
237 | ||
238 | static struct pf_unit units[PF_UNITS]; | |
239 | ||
240 | static int pf_identify(struct pf_unit *pf); | |
241 | static void pf_lock(struct pf_unit *pf, int func); | |
242 | static void pf_eject(struct pf_unit *pf); | |
243 | static int pf_check_media(struct gendisk *disk); | |
244 | ||
245 | static char pf_scratch[512]; /* scratch block buffer */ | |
246 | ||
247 | /* the variables below are used mainly in the I/O request engine, which | |
248 | processes only one request at a time. | |
249 | */ | |
250 | ||
251 | static int pf_retries = 0; /* i/o error retry count */ | |
252 | static int pf_busy = 0; /* request being processed ? */ | |
253 | static struct request *pf_req; /* current request */ | |
254 | static int pf_block; /* address of next requested block */ | |
255 | static int pf_count; /* number of blocks still to do */ | |
256 | static int pf_run; /* sectors in current cluster */ | |
257 | static int pf_cmd; /* current command READ/WRITE */ | |
258 | static struct pf_unit *pf_current;/* unit of current request */ | |
259 | static int pf_mask; /* stopper for pseudo-int */ | |
260 | static char *pf_buf; /* buffer for request in progress */ | |
261 | ||
262 | /* kernel glue structures */ | |
263 | ||
264 | static struct block_device_operations pf_fops = { | |
265 | .owner = THIS_MODULE, | |
266 | .open = pf_open, | |
267 | .release = pf_release, | |
268 | .ioctl = pf_ioctl, | |
269 | .media_changed = pf_check_media, | |
270 | }; | |
271 | ||
272 | static void __init pf_init_units(void) | |
273 | { | |
274 | struct pf_unit *pf; | |
275 | int unit; | |
276 | ||
277 | pf_drive_count = 0; | |
278 | for (unit = 0, pf = units; unit < PF_UNITS; unit++, pf++) { | |
279 | struct gendisk *disk = alloc_disk(1); | |
280 | if (!disk) | |
281 | continue; | |
282 | pf->disk = disk; | |
283 | pf->pi = &pf->pia; | |
284 | pf->media_status = PF_NM; | |
285 | pf->drive = (*drives[unit])[D_SLV]; | |
286 | pf->lun = (*drives[unit])[D_LUN]; | |
287 | snprintf(pf->name, PF_NAMELEN, "%s%d", name, unit); | |
288 | disk->major = major; | |
289 | disk->first_minor = unit; | |
290 | strcpy(disk->disk_name, pf->name); | |
291 | disk->fops = &pf_fops; | |
292 | if (!(*drives[unit])[D_PRT]) | |
293 | pf_drive_count++; | |
294 | } | |
295 | } | |
296 | ||
297 | static int pf_open(struct inode *inode, struct file *file) | |
298 | { | |
299 | struct pf_unit *pf = inode->i_bdev->bd_disk->private_data; | |
300 | ||
301 | pf_identify(pf); | |
302 | ||
303 | if (pf->media_status == PF_NM) | |
304 | return -ENODEV; | |
305 | ||
306 | if ((pf->media_status == PF_RO) && (file->f_mode & 2)) | |
307 | return -EROFS; | |
308 | ||
309 | pf->access++; | |
310 | if (pf->removable) | |
311 | pf_lock(pf, 1); | |
312 | ||
313 | return 0; | |
314 | } | |
315 | ||
316 | static int pf_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg) | |
317 | { | |
318 | struct pf_unit *pf = inode->i_bdev->bd_disk->private_data; | |
319 | struct hd_geometry __user *geo = (struct hd_geometry __user *) arg; | |
320 | struct hd_geometry g; | |
321 | sector_t capacity; | |
322 | ||
323 | if (cmd == CDROMEJECT) { | |
324 | if (pf->access == 1) { | |
325 | pf_eject(pf); | |
326 | return 0; | |
327 | } | |
328 | return -EBUSY; | |
329 | } | |
330 | if (cmd != HDIO_GETGEO) | |
331 | return -EINVAL; | |
332 | capacity = get_capacity(pf->disk); | |
333 | if (capacity < PF_FD_MAX) { | |
334 | g.cylinders = sector_div(capacity, PF_FD_HDS * PF_FD_SPT); | |
335 | g.heads = PF_FD_HDS; | |
336 | g.sectors = PF_FD_SPT; | |
337 | } else { | |
338 | g.cylinders = sector_div(capacity, PF_HD_HDS * PF_HD_SPT); | |
339 | g.heads = PF_HD_HDS; | |
340 | g.sectors = PF_HD_SPT; | |
341 | } | |
342 | if (copy_to_user(geo, &g, sizeof(g))) | |
343 | return -EFAULT; | |
344 | return 0; | |
345 | } | |
346 | ||
347 | static int pf_release(struct inode *inode, struct file *file) | |
348 | { | |
349 | struct pf_unit *pf = inode->i_bdev->bd_disk->private_data; | |
350 | ||
351 | if (pf->access <= 0) | |
352 | return -EINVAL; | |
353 | ||
354 | pf->access--; | |
355 | ||
356 | if (!pf->access && pf->removable) | |
357 | pf_lock(pf, 0); | |
358 | ||
359 | return 0; | |
360 | ||
361 | } | |
362 | ||
363 | static int pf_check_media(struct gendisk *disk) | |
364 | { | |
365 | return 1; | |
366 | } | |
367 | ||
368 | static inline int status_reg(struct pf_unit *pf) | |
369 | { | |
370 | return pi_read_regr(pf->pi, 1, 6); | |
371 | } | |
372 | ||
373 | static inline int read_reg(struct pf_unit *pf, int reg) | |
374 | { | |
375 | return pi_read_regr(pf->pi, 0, reg); | |
376 | } | |
377 | ||
378 | static inline void write_reg(struct pf_unit *pf, int reg, int val) | |
379 | { | |
380 | pi_write_regr(pf->pi, 0, reg, val); | |
381 | } | |
382 | ||
383 | static int pf_wait(struct pf_unit *pf, int go, int stop, char *fun, char *msg) | |
384 | { | |
385 | int j, r, e, s, p; | |
386 | ||
387 | j = 0; | |
388 | while ((((r = status_reg(pf)) & go) || (stop && (!(r & stop)))) | |
389 | && (j++ < PF_SPIN)) | |
390 | udelay(PF_SPIN_DEL); | |
391 | ||
392 | if ((r & (STAT_ERR & stop)) || (j >= PF_SPIN)) { | |
393 | s = read_reg(pf, 7); | |
394 | e = read_reg(pf, 1); | |
395 | p = read_reg(pf, 2); | |
396 | if (j >= PF_SPIN) | |
397 | e |= 0x100; | |
398 | if (fun) | |
399 | printk("%s: %s %s: alt=0x%x stat=0x%x err=0x%x" | |
400 | " loop=%d phase=%d\n", | |
401 | pf->name, fun, msg, r, s, e, j, p); | |
402 | return (e << 8) + s; | |
403 | } | |
404 | return 0; | |
405 | } | |
406 | ||
407 | static int pf_command(struct pf_unit *pf, char *cmd, int dlen, char *fun) | |
408 | { | |
409 | pi_connect(pf->pi); | |
410 | ||
411 | write_reg(pf, 6, 0xa0+0x10*pf->drive); | |
412 | ||
413 | if (pf_wait(pf, STAT_BUSY | STAT_DRQ, 0, fun, "before command")) { | |
414 | pi_disconnect(pf->pi); | |
415 | return -1; | |
416 | } | |
417 | ||
418 | write_reg(pf, 4, dlen % 256); | |
419 | write_reg(pf, 5, dlen / 256); | |
420 | write_reg(pf, 7, 0xa0); /* ATAPI packet command */ | |
421 | ||
422 | if (pf_wait(pf, STAT_BUSY, STAT_DRQ, fun, "command DRQ")) { | |
423 | pi_disconnect(pf->pi); | |
424 | return -1; | |
425 | } | |
426 | ||
427 | if (read_reg(pf, 2) != 1) { | |
428 | printk("%s: %s: command phase error\n", pf->name, fun); | |
429 | pi_disconnect(pf->pi); | |
430 | return -1; | |
431 | } | |
432 | ||
433 | pi_write_block(pf->pi, cmd, 12); | |
434 | ||
435 | return 0; | |
436 | } | |
437 | ||
438 | static int pf_completion(struct pf_unit *pf, char *buf, char *fun) | |
439 | { | |
440 | int r, s, n; | |
441 | ||
442 | r = pf_wait(pf, STAT_BUSY, STAT_DRQ | STAT_READY | STAT_ERR, | |
443 | fun, "completion"); | |
444 | ||
445 | if ((read_reg(pf, 2) & 2) && (read_reg(pf, 7) & STAT_DRQ)) { | |
446 | n = (((read_reg(pf, 4) + 256 * read_reg(pf, 5)) + | |
447 | 3) & 0xfffc); | |
448 | pi_read_block(pf->pi, buf, n); | |
449 | } | |
450 | ||
451 | s = pf_wait(pf, STAT_BUSY, STAT_READY | STAT_ERR, fun, "data done"); | |
452 | ||
453 | pi_disconnect(pf->pi); | |
454 | ||
455 | return (r ? r : s); | |
456 | } | |
457 | ||
458 | static void pf_req_sense(struct pf_unit *pf, int quiet) | |
459 | { | |
460 | char rs_cmd[12] = | |
461 | { ATAPI_REQ_SENSE, pf->lun << 5, 0, 0, 16, 0, 0, 0, 0, 0, 0, 0 }; | |
462 | char buf[16]; | |
463 | int r; | |
464 | ||
465 | r = pf_command(pf, rs_cmd, 16, "Request sense"); | |
466 | mdelay(1); | |
467 | if (!r) | |
468 | pf_completion(pf, buf, "Request sense"); | |
469 | ||
470 | if ((!r) && (!quiet)) | |
471 | printk("%s: Sense key: %x, ASC: %x, ASQ: %x\n", | |
472 | pf->name, buf[2] & 0xf, buf[12], buf[13]); | |
473 | } | |
474 | ||
475 | static int pf_atapi(struct pf_unit *pf, char *cmd, int dlen, char *buf, char *fun) | |
476 | { | |
477 | int r; | |
478 | ||
479 | r = pf_command(pf, cmd, dlen, fun); | |
480 | mdelay(1); | |
481 | if (!r) | |
482 | r = pf_completion(pf, buf, fun); | |
483 | if (r) | |
484 | pf_req_sense(pf, !fun); | |
485 | ||
486 | return r; | |
487 | } | |
488 | ||
489 | #define DBMSG(msg) ((verbose>1)?(msg):NULL) | |
490 | ||
491 | static void pf_lock(struct pf_unit *pf, int func) | |
492 | { | |
493 | char lo_cmd[12] = { ATAPI_LOCK, pf->lun << 5, 0, 0, func, 0, 0, 0, 0, 0, 0, 0 }; | |
494 | ||
495 | pf_atapi(pf, lo_cmd, 0, pf_scratch, func ? "unlock" : "lock"); | |
496 | } | |
497 | ||
498 | static void pf_eject(struct pf_unit *pf) | |
499 | { | |
500 | char ej_cmd[12] = { ATAPI_DOOR, pf->lun << 5, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0 }; | |
501 | ||
502 | pf_lock(pf, 0); | |
503 | pf_atapi(pf, ej_cmd, 0, pf_scratch, "eject"); | |
504 | } | |
505 | ||
506 | #define PF_RESET_TMO 30 /* in tenths of a second */ | |
507 | ||
508 | static void pf_sleep(int cs) | |
509 | { | |
86e84862 | 510 | schedule_timeout_interruptible(cs); |
1da177e4 LT |
511 | } |
512 | ||
513 | /* the ATAPI standard actually specifies the contents of all 7 registers | |
514 | after a reset, but the specification is ambiguous concerning the last | |
515 | two bytes, and different drives interpret the standard differently. | |
516 | */ | |
517 | ||
518 | static int pf_reset(struct pf_unit *pf) | |
519 | { | |
520 | int i, k, flg; | |
521 | int expect[5] = { 1, 1, 1, 0x14, 0xeb }; | |
522 | ||
523 | pi_connect(pf->pi); | |
524 | write_reg(pf, 6, 0xa0+0x10*pf->drive); | |
525 | write_reg(pf, 7, 8); | |
526 | ||
527 | pf_sleep(20 * HZ / 1000); | |
528 | ||
529 | k = 0; | |
530 | while ((k++ < PF_RESET_TMO) && (status_reg(pf) & STAT_BUSY)) | |
531 | pf_sleep(HZ / 10); | |
532 | ||
533 | flg = 1; | |
534 | for (i = 0; i < 5; i++) | |
535 | flg &= (read_reg(pf, i + 1) == expect[i]); | |
536 | ||
537 | if (verbose) { | |
538 | printk("%s: Reset (%d) signature = ", pf->name, k); | |
539 | for (i = 0; i < 5; i++) | |
540 | printk("%3x", read_reg(pf, i + 1)); | |
541 | if (!flg) | |
542 | printk(" (incorrect)"); | |
543 | printk("\n"); | |
544 | } | |
545 | ||
546 | pi_disconnect(pf->pi); | |
547 | return flg - 1; | |
548 | } | |
549 | ||
550 | static void pf_mode_sense(struct pf_unit *pf) | |
551 | { | |
552 | char ms_cmd[12] = | |
553 | { ATAPI_MODE_SENSE, pf->lun << 5, 0, 0, 0, 0, 0, 0, 8, 0, 0, 0 }; | |
554 | char buf[8]; | |
555 | ||
556 | pf_atapi(pf, ms_cmd, 8, buf, DBMSG("mode sense")); | |
557 | pf->media_status = PF_RW; | |
558 | if (buf[3] & 0x80) | |
559 | pf->media_status = PF_RO; | |
560 | } | |
561 | ||
562 | static void xs(char *buf, char *targ, int offs, int len) | |
563 | { | |
564 | int j, k, l; | |
565 | ||
566 | j = 0; | |
567 | l = 0; | |
568 | for (k = 0; k < len; k++) | |
569 | if ((buf[k + offs] != 0x20) || (buf[k + offs] != l)) | |
570 | l = targ[j++] = buf[k + offs]; | |
571 | if (l == 0x20) | |
572 | j--; | |
573 | targ[j] = 0; | |
574 | } | |
575 | ||
576 | static int xl(char *buf, int offs) | |
577 | { | |
578 | int v, k; | |
579 | ||
580 | v = 0; | |
581 | for (k = 0; k < 4; k++) | |
582 | v = v * 256 + (buf[k + offs] & 0xff); | |
583 | return v; | |
584 | } | |
585 | ||
586 | static void pf_get_capacity(struct pf_unit *pf) | |
587 | { | |
588 | char rc_cmd[12] = { ATAPI_CAPACITY, pf->lun << 5, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }; | |
589 | char buf[8]; | |
590 | int bs; | |
591 | ||
592 | if (pf_atapi(pf, rc_cmd, 8, buf, DBMSG("get capacity"))) { | |
593 | pf->media_status = PF_NM; | |
594 | return; | |
595 | } | |
596 | set_capacity(pf->disk, xl(buf, 0) + 1); | |
597 | bs = xl(buf, 4); | |
598 | if (bs != 512) { | |
599 | set_capacity(pf->disk, 0); | |
600 | if (verbose) | |
601 | printk("%s: Drive %d, LUN %d," | |
602 | " unsupported block size %d\n", | |
603 | pf->name, pf->drive, pf->lun, bs); | |
604 | } | |
605 | } | |
606 | ||
607 | static int pf_identify(struct pf_unit *pf) | |
608 | { | |
609 | int dt, s; | |
610 | char *ms[2] = { "master", "slave" }; | |
611 | char mf[10], id[18]; | |
612 | char id_cmd[12] = | |
613 | { ATAPI_IDENTIFY, pf->lun << 5, 0, 0, 36, 0, 0, 0, 0, 0, 0, 0 }; | |
614 | char buf[36]; | |
615 | ||
616 | s = pf_atapi(pf, id_cmd, 36, buf, "identify"); | |
617 | if (s) | |
618 | return -1; | |
619 | ||
620 | dt = buf[0] & 0x1f; | |
621 | if ((dt != 0) && (dt != 7)) { | |
622 | if (verbose) | |
623 | printk("%s: Drive %d, LUN %d, unsupported type %d\n", | |
624 | pf->name, pf->drive, pf->lun, dt); | |
625 | return -1; | |
626 | } | |
627 | ||
628 | xs(buf, mf, 8, 8); | |
629 | xs(buf, id, 16, 16); | |
630 | ||
631 | pf->removable = (buf[1] & 0x80); | |
632 | ||
633 | pf_mode_sense(pf); | |
634 | pf_mode_sense(pf); | |
635 | pf_mode_sense(pf); | |
636 | ||
637 | pf_get_capacity(pf); | |
638 | ||
639 | printk("%s: %s %s, %s LUN %d, type %d", | |
640 | pf->name, mf, id, ms[pf->drive], pf->lun, dt); | |
641 | if (pf->removable) | |
642 | printk(", removable"); | |
643 | if (pf->media_status == PF_NM) | |
644 | printk(", no media\n"); | |
645 | else { | |
646 | if (pf->media_status == PF_RO) | |
647 | printk(", RO"); | |
648 | printk(", %llu blocks\n", | |
649 | (unsigned long long)get_capacity(pf->disk)); | |
650 | } | |
651 | return 0; | |
652 | } | |
653 | ||
654 | /* returns 0, with id set if drive is detected | |
655 | -1, if drive detection failed | |
656 | */ | |
657 | static int pf_probe(struct pf_unit *pf) | |
658 | { | |
659 | if (pf->drive == -1) { | |
660 | for (pf->drive = 0; pf->drive <= 1; pf->drive++) | |
661 | if (!pf_reset(pf)) { | |
662 | if (pf->lun != -1) | |
663 | return pf_identify(pf); | |
664 | else | |
665 | for (pf->lun = 0; pf->lun < 8; pf->lun++) | |
666 | if (!pf_identify(pf)) | |
667 | return 0; | |
668 | } | |
669 | } else { | |
670 | if (pf_reset(pf)) | |
671 | return -1; | |
672 | if (pf->lun != -1) | |
673 | return pf_identify(pf); | |
674 | for (pf->lun = 0; pf->lun < 8; pf->lun++) | |
675 | if (!pf_identify(pf)) | |
676 | return 0; | |
677 | } | |
678 | return -1; | |
679 | } | |
680 | ||
681 | static int pf_detect(void) | |
682 | { | |
683 | struct pf_unit *pf = units; | |
684 | int k, unit; | |
685 | ||
686 | printk("%s: %s version %s, major %d, cluster %d, nice %d\n", | |
687 | name, name, PF_VERSION, major, cluster, nice); | |
688 | ||
689 | k = 0; | |
690 | if (pf_drive_count == 0) { | |
691 | if (pi_init(pf->pi, 1, -1, -1, -1, -1, -1, pf_scratch, PI_PF, | |
692 | verbose, pf->name)) { | |
693 | if (!pf_probe(pf) && pf->disk) { | |
694 | pf->present = 1; | |
695 | k++; | |
696 | } else | |
697 | pi_release(pf->pi); | |
698 | } | |
699 | ||
700 | } else | |
701 | for (unit = 0; unit < PF_UNITS; unit++, pf++) { | |
702 | int *conf = *drives[unit]; | |
703 | if (!conf[D_PRT]) | |
704 | continue; | |
705 | if (pi_init(pf->pi, 0, conf[D_PRT], conf[D_MOD], | |
706 | conf[D_UNI], conf[D_PRO], conf[D_DLY], | |
707 | pf_scratch, PI_PF, verbose, pf->name)) { | |
708 | if (!pf_probe(pf) && pf->disk) { | |
709 | pf->present = 1; | |
710 | k++; | |
711 | } else | |
712 | pi_release(pf->pi); | |
713 | } | |
714 | } | |
715 | if (k) | |
716 | return 0; | |
717 | ||
718 | printk("%s: No ATAPI disk detected\n", name); | |
719 | for (pf = units, unit = 0; unit < PF_UNITS; pf++, unit++) | |
720 | put_disk(pf->disk); | |
721 | return -1; | |
722 | } | |
723 | ||
724 | /* The i/o request engine */ | |
725 | ||
726 | static int pf_start(struct pf_unit *pf, int cmd, int b, int c) | |
727 | { | |
728 | int i; | |
729 | char io_cmd[12] = { cmd, pf->lun << 5, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }; | |
730 | ||
731 | for (i = 0; i < 4; i++) { | |
732 | io_cmd[5 - i] = b & 0xff; | |
733 | b = b >> 8; | |
734 | } | |
735 | ||
736 | io_cmd[8] = c & 0xff; | |
737 | io_cmd[7] = (c >> 8) & 0xff; | |
738 | ||
739 | i = pf_command(pf, io_cmd, c * 512, "start i/o"); | |
740 | ||
741 | mdelay(1); | |
742 | ||
743 | return i; | |
744 | } | |
745 | ||
746 | static int pf_ready(void) | |
747 | { | |
748 | return (((status_reg(pf_current) & (STAT_BUSY | pf_mask)) == pf_mask)); | |
749 | } | |
750 | ||
751 | static struct request_queue *pf_queue; | |
752 | ||
9564df1f JA |
753 | static void pf_end_request(int uptodate) |
754 | { | |
755 | if (pf_req) { | |
756 | end_request(pf_req, uptodate); | |
757 | pf_req = NULL; | |
758 | } | |
759 | } | |
760 | ||
1da177e4 LT |
761 | static void do_pf_request(request_queue_t * q) |
762 | { | |
763 | if (pf_busy) | |
764 | return; | |
765 | repeat: | |
766 | pf_req = elv_next_request(q); | |
767 | if (!pf_req) | |
768 | return; | |
769 | ||
770 | pf_current = pf_req->rq_disk->private_data; | |
771 | pf_block = pf_req->sector; | |
772 | pf_run = pf_req->nr_sectors; | |
773 | pf_count = pf_req->current_nr_sectors; | |
774 | ||
775 | if (pf_block + pf_count > get_capacity(pf_req->rq_disk)) { | |
9564df1f | 776 | pf_end_request(0); |
1da177e4 LT |
777 | goto repeat; |
778 | } | |
779 | ||
780 | pf_cmd = rq_data_dir(pf_req); | |
781 | pf_buf = pf_req->buffer; | |
782 | pf_retries = 0; | |
783 | ||
784 | pf_busy = 1; | |
785 | if (pf_cmd == READ) | |
786 | pi_do_claimed(pf_current->pi, do_pf_read); | |
787 | else if (pf_cmd == WRITE) | |
788 | pi_do_claimed(pf_current->pi, do_pf_write); | |
789 | else { | |
790 | pf_busy = 0; | |
9564df1f | 791 | pf_end_request(0); |
1da177e4 LT |
792 | goto repeat; |
793 | } | |
794 | } | |
795 | ||
796 | static int pf_next_buf(void) | |
797 | { | |
798 | unsigned long saved_flags; | |
799 | ||
800 | pf_count--; | |
801 | pf_run--; | |
802 | pf_buf += 512; | |
803 | pf_block++; | |
804 | if (!pf_run) | |
805 | return 0; | |
806 | if (!pf_count) | |
807 | return 1; | |
808 | spin_lock_irqsave(&pf_spin_lock, saved_flags); | |
9564df1f | 809 | pf_end_request(1); |
1da177e4 LT |
810 | spin_unlock_irqrestore(&pf_spin_lock, saved_flags); |
811 | return 1; | |
812 | } | |
813 | ||
814 | static inline void next_request(int success) | |
815 | { | |
816 | unsigned long saved_flags; | |
817 | ||
818 | spin_lock_irqsave(&pf_spin_lock, saved_flags); | |
9564df1f | 819 | pf_end_request(success); |
1da177e4 LT |
820 | pf_busy = 0; |
821 | do_pf_request(pf_queue); | |
822 | spin_unlock_irqrestore(&pf_spin_lock, saved_flags); | |
823 | } | |
824 | ||
825 | /* detach from the calling context - in case the spinlock is held */ | |
826 | static void do_pf_read(void) | |
827 | { | |
828 | ps_set_intr(do_pf_read_start, NULL, 0, nice); | |
829 | } | |
830 | ||
831 | static void do_pf_read_start(void) | |
832 | { | |
833 | pf_busy = 1; | |
834 | ||
835 | if (pf_start(pf_current, ATAPI_READ_10, pf_block, pf_run)) { | |
836 | pi_disconnect(pf_current->pi); | |
837 | if (pf_retries < PF_MAX_RETRIES) { | |
838 | pf_retries++; | |
839 | pi_do_claimed(pf_current->pi, do_pf_read_start); | |
840 | return; | |
841 | } | |
842 | next_request(0); | |
843 | return; | |
844 | } | |
845 | pf_mask = STAT_DRQ; | |
846 | ps_set_intr(do_pf_read_drq, pf_ready, PF_TMO, nice); | |
847 | } | |
848 | ||
849 | static void do_pf_read_drq(void) | |
850 | { | |
851 | while (1) { | |
852 | if (pf_wait(pf_current, STAT_BUSY, STAT_DRQ | STAT_ERR, | |
853 | "read block", "completion") & STAT_ERR) { | |
854 | pi_disconnect(pf_current->pi); | |
855 | if (pf_retries < PF_MAX_RETRIES) { | |
856 | pf_req_sense(pf_current, 0); | |
857 | pf_retries++; | |
858 | pi_do_claimed(pf_current->pi, do_pf_read_start); | |
859 | return; | |
860 | } | |
861 | next_request(0); | |
862 | return; | |
863 | } | |
864 | pi_read_block(pf_current->pi, pf_buf, 512); | |
865 | if (pf_next_buf()) | |
866 | break; | |
867 | } | |
868 | pi_disconnect(pf_current->pi); | |
869 | next_request(1); | |
870 | } | |
871 | ||
872 | static void do_pf_write(void) | |
873 | { | |
874 | ps_set_intr(do_pf_write_start, NULL, 0, nice); | |
875 | } | |
876 | ||
877 | static void do_pf_write_start(void) | |
878 | { | |
879 | pf_busy = 1; | |
880 | ||
881 | if (pf_start(pf_current, ATAPI_WRITE_10, pf_block, pf_run)) { | |
882 | pi_disconnect(pf_current->pi); | |
883 | if (pf_retries < PF_MAX_RETRIES) { | |
884 | pf_retries++; | |
885 | pi_do_claimed(pf_current->pi, do_pf_write_start); | |
886 | return; | |
887 | } | |
888 | next_request(0); | |
889 | return; | |
890 | } | |
891 | ||
892 | while (1) { | |
893 | if (pf_wait(pf_current, STAT_BUSY, STAT_DRQ | STAT_ERR, | |
894 | "write block", "data wait") & STAT_ERR) { | |
895 | pi_disconnect(pf_current->pi); | |
896 | if (pf_retries < PF_MAX_RETRIES) { | |
897 | pf_retries++; | |
898 | pi_do_claimed(pf_current->pi, do_pf_write_start); | |
899 | return; | |
900 | } | |
901 | next_request(0); | |
902 | return; | |
903 | } | |
904 | pi_write_block(pf_current->pi, pf_buf, 512); | |
905 | if (pf_next_buf()) | |
906 | break; | |
907 | } | |
908 | pf_mask = 0; | |
909 | ps_set_intr(do_pf_write_done, pf_ready, PF_TMO, nice); | |
910 | } | |
911 | ||
912 | static void do_pf_write_done(void) | |
913 | { | |
914 | if (pf_wait(pf_current, STAT_BUSY, 0, "write block", "done") & STAT_ERR) { | |
915 | pi_disconnect(pf_current->pi); | |
916 | if (pf_retries < PF_MAX_RETRIES) { | |
917 | pf_retries++; | |
918 | pi_do_claimed(pf_current->pi, do_pf_write_start); | |
919 | return; | |
920 | } | |
921 | next_request(0); | |
922 | return; | |
923 | } | |
924 | pi_disconnect(pf_current->pi); | |
925 | next_request(1); | |
926 | } | |
927 | ||
928 | static int __init pf_init(void) | |
929 | { /* preliminary initialisation */ | |
930 | struct pf_unit *pf; | |
931 | int unit; | |
932 | ||
933 | if (disable) | |
934 | return -1; | |
935 | ||
936 | pf_init_units(); | |
937 | ||
938 | if (pf_detect()) | |
939 | return -1; | |
940 | pf_busy = 0; | |
941 | ||
942 | if (register_blkdev(major, name)) { | |
943 | for (pf = units, unit = 0; unit < PF_UNITS; pf++, unit++) | |
944 | put_disk(pf->disk); | |
945 | return -1; | |
946 | } | |
947 | pf_queue = blk_init_queue(do_pf_request, &pf_spin_lock); | |
948 | if (!pf_queue) { | |
949 | unregister_blkdev(major, name); | |
950 | for (pf = units, unit = 0; unit < PF_UNITS; pf++, unit++) | |
951 | put_disk(pf->disk); | |
952 | return -1; | |
953 | } | |
954 | ||
955 | blk_queue_max_phys_segments(pf_queue, cluster); | |
956 | blk_queue_max_hw_segments(pf_queue, cluster); | |
957 | ||
958 | for (pf = units, unit = 0; unit < PF_UNITS; pf++, unit++) { | |
959 | struct gendisk *disk = pf->disk; | |
960 | ||
961 | if (!pf->present) | |
962 | continue; | |
963 | disk->private_data = pf; | |
964 | disk->queue = pf_queue; | |
965 | add_disk(disk); | |
966 | } | |
967 | return 0; | |
968 | } | |
969 | ||
970 | static void __exit pf_exit(void) | |
971 | { | |
972 | struct pf_unit *pf; | |
973 | int unit; | |
974 | unregister_blkdev(major, name); | |
975 | for (pf = units, unit = 0; unit < PF_UNITS; pf++, unit++) { | |
976 | if (!pf->present) | |
977 | continue; | |
978 | del_gendisk(pf->disk); | |
979 | put_disk(pf->disk); | |
980 | pi_release(pf->pi); | |
981 | } | |
982 | blk_cleanup_queue(pf_queue); | |
983 | } | |
984 | ||
985 | MODULE_LICENSE("GPL"); | |
986 | module_init(pf_init) | |
987 | module_exit(pf_exit) |