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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 | ||
671d40f4 | 157 | static DEFINE_SPINLOCK(pf_spin_lock); |
1da177e4 LT |
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); | |
165125e1 | 205 | static void do_pf_request(struct request_queue * q); |
1da177e4 LT |
206 | static int pf_ioctl(struct inode *inode, struct file *file, |
207 | unsigned int cmd, unsigned long arg); | |
a885c8c4 | 208 | static int pf_getgeo(struct block_device *bdev, struct hd_geometry *geo); |
1da177e4 LT |
209 | |
210 | static int pf_release(struct inode *inode, struct file *file); | |
211 | ||
212 | static int pf_detect(void); | |
213 | static void do_pf_read(void); | |
214 | static void do_pf_read_start(void); | |
215 | static void do_pf_write(void); | |
216 | static void do_pf_write_start(void); | |
217 | static void do_pf_read_drq(void); | |
218 | static void do_pf_write_done(void); | |
219 | ||
220 | #define PF_NM 0 | |
221 | #define PF_RO 1 | |
222 | #define PF_RW 2 | |
223 | ||
224 | #define PF_NAMELEN 8 | |
225 | ||
226 | struct pf_unit { | |
227 | struct pi_adapter pia; /* interface to paride layer */ | |
228 | struct pi_adapter *pi; | |
229 | int removable; /* removable media device ? */ | |
230 | int media_status; /* media present ? WP ? */ | |
231 | int drive; /* drive */ | |
232 | int lun; | |
233 | int access; /* count of active opens ... */ | |
234 | int present; /* device present ? */ | |
235 | char name[PF_NAMELEN]; /* pf0, pf1, ... */ | |
236 | struct gendisk *disk; | |
237 | }; | |
238 | ||
239 | static struct pf_unit units[PF_UNITS]; | |
240 | ||
241 | static int pf_identify(struct pf_unit *pf); | |
242 | static void pf_lock(struct pf_unit *pf, int func); | |
243 | static void pf_eject(struct pf_unit *pf); | |
244 | static int pf_check_media(struct gendisk *disk); | |
245 | ||
246 | static char pf_scratch[512]; /* scratch block buffer */ | |
247 | ||
248 | /* the variables below are used mainly in the I/O request engine, which | |
249 | processes only one request at a time. | |
250 | */ | |
251 | ||
252 | static int pf_retries = 0; /* i/o error retry count */ | |
253 | static int pf_busy = 0; /* request being processed ? */ | |
254 | static struct request *pf_req; /* current request */ | |
255 | static int pf_block; /* address of next requested block */ | |
256 | static int pf_count; /* number of blocks still to do */ | |
257 | static int pf_run; /* sectors in current cluster */ | |
258 | static int pf_cmd; /* current command READ/WRITE */ | |
259 | static struct pf_unit *pf_current;/* unit of current request */ | |
260 | static int pf_mask; /* stopper for pseudo-int */ | |
261 | static char *pf_buf; /* buffer for request in progress */ | |
262 | ||
263 | /* kernel glue structures */ | |
264 | ||
265 | static struct block_device_operations pf_fops = { | |
266 | .owner = THIS_MODULE, | |
267 | .open = pf_open, | |
268 | .release = pf_release, | |
269 | .ioctl = pf_ioctl, | |
a885c8c4 | 270 | .getgeo = pf_getgeo, |
1da177e4 LT |
271 | .media_changed = pf_check_media, |
272 | }; | |
273 | ||
274 | static void __init pf_init_units(void) | |
275 | { | |
276 | struct pf_unit *pf; | |
277 | int unit; | |
278 | ||
279 | pf_drive_count = 0; | |
280 | for (unit = 0, pf = units; unit < PF_UNITS; unit++, pf++) { | |
281 | struct gendisk *disk = alloc_disk(1); | |
282 | if (!disk) | |
283 | continue; | |
284 | pf->disk = disk; | |
285 | pf->pi = &pf->pia; | |
286 | pf->media_status = PF_NM; | |
287 | pf->drive = (*drives[unit])[D_SLV]; | |
288 | pf->lun = (*drives[unit])[D_LUN]; | |
289 | snprintf(pf->name, PF_NAMELEN, "%s%d", name, unit); | |
290 | disk->major = major; | |
291 | disk->first_minor = unit; | |
292 | strcpy(disk->disk_name, pf->name); | |
293 | disk->fops = &pf_fops; | |
294 | if (!(*drives[unit])[D_PRT]) | |
295 | pf_drive_count++; | |
296 | } | |
297 | } | |
298 | ||
299 | static int pf_open(struct inode *inode, struct file *file) | |
300 | { | |
301 | struct pf_unit *pf = inode->i_bdev->bd_disk->private_data; | |
302 | ||
303 | pf_identify(pf); | |
304 | ||
305 | if (pf->media_status == PF_NM) | |
306 | return -ENODEV; | |
307 | ||
308 | if ((pf->media_status == PF_RO) && (file->f_mode & 2)) | |
309 | return -EROFS; | |
310 | ||
311 | pf->access++; | |
312 | if (pf->removable) | |
313 | pf_lock(pf, 1); | |
314 | ||
315 | return 0; | |
316 | } | |
317 | ||
a885c8c4 | 318 | static int pf_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
1da177e4 | 319 | { |
a885c8c4 CH |
320 | struct pf_unit *pf = bdev->bd_disk->private_data; |
321 | sector_t capacity = get_capacity(pf->disk); | |
322 | ||
1da177e4 | 323 | if (capacity < PF_FD_MAX) { |
a885c8c4 CH |
324 | geo->cylinders = sector_div(capacity, PF_FD_HDS * PF_FD_SPT); |
325 | geo->heads = PF_FD_HDS; | |
326 | geo->sectors = PF_FD_SPT; | |
1da177e4 | 327 | } else { |
a885c8c4 CH |
328 | geo->cylinders = sector_div(capacity, PF_HD_HDS * PF_HD_SPT); |
329 | geo->heads = PF_HD_HDS; | |
330 | geo->sectors = PF_HD_SPT; | |
1da177e4 | 331 | } |
a885c8c4 CH |
332 | |
333 | return 0; | |
334 | } | |
335 | ||
336 | static int pf_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg) | |
337 | { | |
338 | struct pf_unit *pf = inode->i_bdev->bd_disk->private_data; | |
339 | ||
340 | if (cmd != CDROMEJECT) | |
341 | return -EINVAL; | |
342 | ||
343 | if (pf->access != 1) | |
344 | return -EBUSY; | |
345 | pf_eject(pf); | |
1da177e4 LT |
346 | return 0; |
347 | } | |
348 | ||
349 | static int pf_release(struct inode *inode, struct file *file) | |
350 | { | |
351 | struct pf_unit *pf = inode->i_bdev->bd_disk->private_data; | |
352 | ||
353 | if (pf->access <= 0) | |
354 | return -EINVAL; | |
355 | ||
356 | pf->access--; | |
357 | ||
358 | if (!pf->access && pf->removable) | |
359 | pf_lock(pf, 0); | |
360 | ||
361 | return 0; | |
362 | ||
363 | } | |
364 | ||
365 | static int pf_check_media(struct gendisk *disk) | |
366 | { | |
367 | return 1; | |
368 | } | |
369 | ||
370 | static inline int status_reg(struct pf_unit *pf) | |
371 | { | |
372 | return pi_read_regr(pf->pi, 1, 6); | |
373 | } | |
374 | ||
375 | static inline int read_reg(struct pf_unit *pf, int reg) | |
376 | { | |
377 | return pi_read_regr(pf->pi, 0, reg); | |
378 | } | |
379 | ||
380 | static inline void write_reg(struct pf_unit *pf, int reg, int val) | |
381 | { | |
382 | pi_write_regr(pf->pi, 0, reg, val); | |
383 | } | |
384 | ||
385 | static int pf_wait(struct pf_unit *pf, int go, int stop, char *fun, char *msg) | |
386 | { | |
387 | int j, r, e, s, p; | |
388 | ||
389 | j = 0; | |
390 | while ((((r = status_reg(pf)) & go) || (stop && (!(r & stop)))) | |
391 | && (j++ < PF_SPIN)) | |
392 | udelay(PF_SPIN_DEL); | |
393 | ||
394 | if ((r & (STAT_ERR & stop)) || (j >= PF_SPIN)) { | |
395 | s = read_reg(pf, 7); | |
396 | e = read_reg(pf, 1); | |
397 | p = read_reg(pf, 2); | |
398 | if (j >= PF_SPIN) | |
399 | e |= 0x100; | |
400 | if (fun) | |
401 | printk("%s: %s %s: alt=0x%x stat=0x%x err=0x%x" | |
402 | " loop=%d phase=%d\n", | |
403 | pf->name, fun, msg, r, s, e, j, p); | |
404 | return (e << 8) + s; | |
405 | } | |
406 | return 0; | |
407 | } | |
408 | ||
409 | static int pf_command(struct pf_unit *pf, char *cmd, int dlen, char *fun) | |
410 | { | |
411 | pi_connect(pf->pi); | |
412 | ||
413 | write_reg(pf, 6, 0xa0+0x10*pf->drive); | |
414 | ||
415 | if (pf_wait(pf, STAT_BUSY | STAT_DRQ, 0, fun, "before command")) { | |
416 | pi_disconnect(pf->pi); | |
417 | return -1; | |
418 | } | |
419 | ||
420 | write_reg(pf, 4, dlen % 256); | |
421 | write_reg(pf, 5, dlen / 256); | |
422 | write_reg(pf, 7, 0xa0); /* ATAPI packet command */ | |
423 | ||
424 | if (pf_wait(pf, STAT_BUSY, STAT_DRQ, fun, "command DRQ")) { | |
425 | pi_disconnect(pf->pi); | |
426 | return -1; | |
427 | } | |
428 | ||
429 | if (read_reg(pf, 2) != 1) { | |
430 | printk("%s: %s: command phase error\n", pf->name, fun); | |
431 | pi_disconnect(pf->pi); | |
432 | return -1; | |
433 | } | |
434 | ||
435 | pi_write_block(pf->pi, cmd, 12); | |
436 | ||
437 | return 0; | |
438 | } | |
439 | ||
440 | static int pf_completion(struct pf_unit *pf, char *buf, char *fun) | |
441 | { | |
442 | int r, s, n; | |
443 | ||
444 | r = pf_wait(pf, STAT_BUSY, STAT_DRQ | STAT_READY | STAT_ERR, | |
445 | fun, "completion"); | |
446 | ||
447 | if ((read_reg(pf, 2) & 2) && (read_reg(pf, 7) & STAT_DRQ)) { | |
448 | n = (((read_reg(pf, 4) + 256 * read_reg(pf, 5)) + | |
449 | 3) & 0xfffc); | |
450 | pi_read_block(pf->pi, buf, n); | |
451 | } | |
452 | ||
453 | s = pf_wait(pf, STAT_BUSY, STAT_READY | STAT_ERR, fun, "data done"); | |
454 | ||
455 | pi_disconnect(pf->pi); | |
456 | ||
457 | return (r ? r : s); | |
458 | } | |
459 | ||
460 | static void pf_req_sense(struct pf_unit *pf, int quiet) | |
461 | { | |
462 | char rs_cmd[12] = | |
463 | { ATAPI_REQ_SENSE, pf->lun << 5, 0, 0, 16, 0, 0, 0, 0, 0, 0, 0 }; | |
464 | char buf[16]; | |
465 | int r; | |
466 | ||
467 | r = pf_command(pf, rs_cmd, 16, "Request sense"); | |
468 | mdelay(1); | |
469 | if (!r) | |
470 | pf_completion(pf, buf, "Request sense"); | |
471 | ||
472 | if ((!r) && (!quiet)) | |
473 | printk("%s: Sense key: %x, ASC: %x, ASQ: %x\n", | |
474 | pf->name, buf[2] & 0xf, buf[12], buf[13]); | |
475 | } | |
476 | ||
477 | static int pf_atapi(struct pf_unit *pf, char *cmd, int dlen, char *buf, char *fun) | |
478 | { | |
479 | int r; | |
480 | ||
481 | r = pf_command(pf, cmd, dlen, fun); | |
482 | mdelay(1); | |
483 | if (!r) | |
484 | r = pf_completion(pf, buf, fun); | |
485 | if (r) | |
486 | pf_req_sense(pf, !fun); | |
487 | ||
488 | return r; | |
489 | } | |
490 | ||
491 | #define DBMSG(msg) ((verbose>1)?(msg):NULL) | |
492 | ||
493 | static void pf_lock(struct pf_unit *pf, int func) | |
494 | { | |
495 | char lo_cmd[12] = { ATAPI_LOCK, pf->lun << 5, 0, 0, func, 0, 0, 0, 0, 0, 0, 0 }; | |
496 | ||
497 | pf_atapi(pf, lo_cmd, 0, pf_scratch, func ? "unlock" : "lock"); | |
498 | } | |
499 | ||
500 | static void pf_eject(struct pf_unit *pf) | |
501 | { | |
502 | char ej_cmd[12] = { ATAPI_DOOR, pf->lun << 5, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0 }; | |
503 | ||
504 | pf_lock(pf, 0); | |
505 | pf_atapi(pf, ej_cmd, 0, pf_scratch, "eject"); | |
506 | } | |
507 | ||
508 | #define PF_RESET_TMO 30 /* in tenths of a second */ | |
509 | ||
510 | static void pf_sleep(int cs) | |
511 | { | |
86e84862 | 512 | schedule_timeout_interruptible(cs); |
1da177e4 LT |
513 | } |
514 | ||
515 | /* the ATAPI standard actually specifies the contents of all 7 registers | |
516 | after a reset, but the specification is ambiguous concerning the last | |
517 | two bytes, and different drives interpret the standard differently. | |
518 | */ | |
519 | ||
520 | static int pf_reset(struct pf_unit *pf) | |
521 | { | |
522 | int i, k, flg; | |
523 | int expect[5] = { 1, 1, 1, 0x14, 0xeb }; | |
524 | ||
525 | pi_connect(pf->pi); | |
526 | write_reg(pf, 6, 0xa0+0x10*pf->drive); | |
527 | write_reg(pf, 7, 8); | |
528 | ||
529 | pf_sleep(20 * HZ / 1000); | |
530 | ||
531 | k = 0; | |
532 | while ((k++ < PF_RESET_TMO) && (status_reg(pf) & STAT_BUSY)) | |
533 | pf_sleep(HZ / 10); | |
534 | ||
535 | flg = 1; | |
536 | for (i = 0; i < 5; i++) | |
537 | flg &= (read_reg(pf, i + 1) == expect[i]); | |
538 | ||
539 | if (verbose) { | |
540 | printk("%s: Reset (%d) signature = ", pf->name, k); | |
541 | for (i = 0; i < 5; i++) | |
542 | printk("%3x", read_reg(pf, i + 1)); | |
543 | if (!flg) | |
544 | printk(" (incorrect)"); | |
545 | printk("\n"); | |
546 | } | |
547 | ||
548 | pi_disconnect(pf->pi); | |
549 | return flg - 1; | |
550 | } | |
551 | ||
552 | static void pf_mode_sense(struct pf_unit *pf) | |
553 | { | |
554 | char ms_cmd[12] = | |
555 | { ATAPI_MODE_SENSE, pf->lun << 5, 0, 0, 0, 0, 0, 0, 8, 0, 0, 0 }; | |
556 | char buf[8]; | |
557 | ||
558 | pf_atapi(pf, ms_cmd, 8, buf, DBMSG("mode sense")); | |
559 | pf->media_status = PF_RW; | |
560 | if (buf[3] & 0x80) | |
561 | pf->media_status = PF_RO; | |
562 | } | |
563 | ||
564 | static void xs(char *buf, char *targ, int offs, int len) | |
565 | { | |
566 | int j, k, l; | |
567 | ||
568 | j = 0; | |
569 | l = 0; | |
570 | for (k = 0; k < len; k++) | |
571 | if ((buf[k + offs] != 0x20) || (buf[k + offs] != l)) | |
572 | l = targ[j++] = buf[k + offs]; | |
573 | if (l == 0x20) | |
574 | j--; | |
575 | targ[j] = 0; | |
576 | } | |
577 | ||
578 | static int xl(char *buf, int offs) | |
579 | { | |
580 | int v, k; | |
581 | ||
582 | v = 0; | |
583 | for (k = 0; k < 4; k++) | |
584 | v = v * 256 + (buf[k + offs] & 0xff); | |
585 | return v; | |
586 | } | |
587 | ||
588 | static void pf_get_capacity(struct pf_unit *pf) | |
589 | { | |
590 | char rc_cmd[12] = { ATAPI_CAPACITY, pf->lun << 5, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }; | |
591 | char buf[8]; | |
592 | int bs; | |
593 | ||
594 | if (pf_atapi(pf, rc_cmd, 8, buf, DBMSG("get capacity"))) { | |
595 | pf->media_status = PF_NM; | |
596 | return; | |
597 | } | |
598 | set_capacity(pf->disk, xl(buf, 0) + 1); | |
599 | bs = xl(buf, 4); | |
600 | if (bs != 512) { | |
601 | set_capacity(pf->disk, 0); | |
602 | if (verbose) | |
603 | printk("%s: Drive %d, LUN %d," | |
604 | " unsupported block size %d\n", | |
605 | pf->name, pf->drive, pf->lun, bs); | |
606 | } | |
607 | } | |
608 | ||
609 | static int pf_identify(struct pf_unit *pf) | |
610 | { | |
611 | int dt, s; | |
612 | char *ms[2] = { "master", "slave" }; | |
613 | char mf[10], id[18]; | |
614 | char id_cmd[12] = | |
615 | { ATAPI_IDENTIFY, pf->lun << 5, 0, 0, 36, 0, 0, 0, 0, 0, 0, 0 }; | |
616 | char buf[36]; | |
617 | ||
618 | s = pf_atapi(pf, id_cmd, 36, buf, "identify"); | |
619 | if (s) | |
620 | return -1; | |
621 | ||
622 | dt = buf[0] & 0x1f; | |
623 | if ((dt != 0) && (dt != 7)) { | |
624 | if (verbose) | |
625 | printk("%s: Drive %d, LUN %d, unsupported type %d\n", | |
626 | pf->name, pf->drive, pf->lun, dt); | |
627 | return -1; | |
628 | } | |
629 | ||
630 | xs(buf, mf, 8, 8); | |
631 | xs(buf, id, 16, 16); | |
632 | ||
633 | pf->removable = (buf[1] & 0x80); | |
634 | ||
635 | pf_mode_sense(pf); | |
636 | pf_mode_sense(pf); | |
637 | pf_mode_sense(pf); | |
638 | ||
639 | pf_get_capacity(pf); | |
640 | ||
641 | printk("%s: %s %s, %s LUN %d, type %d", | |
642 | pf->name, mf, id, ms[pf->drive], pf->lun, dt); | |
643 | if (pf->removable) | |
644 | printk(", removable"); | |
645 | if (pf->media_status == PF_NM) | |
646 | printk(", no media\n"); | |
647 | else { | |
648 | if (pf->media_status == PF_RO) | |
649 | printk(", RO"); | |
650 | printk(", %llu blocks\n", | |
651 | (unsigned long long)get_capacity(pf->disk)); | |
652 | } | |
653 | return 0; | |
654 | } | |
655 | ||
656 | /* returns 0, with id set if drive is detected | |
657 | -1, if drive detection failed | |
658 | */ | |
659 | static int pf_probe(struct pf_unit *pf) | |
660 | { | |
661 | if (pf->drive == -1) { | |
662 | for (pf->drive = 0; pf->drive <= 1; pf->drive++) | |
663 | if (!pf_reset(pf)) { | |
664 | if (pf->lun != -1) | |
665 | return pf_identify(pf); | |
666 | else | |
667 | for (pf->lun = 0; pf->lun < 8; pf->lun++) | |
668 | if (!pf_identify(pf)) | |
669 | return 0; | |
670 | } | |
671 | } else { | |
672 | if (pf_reset(pf)) | |
673 | return -1; | |
674 | if (pf->lun != -1) | |
675 | return pf_identify(pf); | |
676 | for (pf->lun = 0; pf->lun < 8; pf->lun++) | |
677 | if (!pf_identify(pf)) | |
678 | return 0; | |
679 | } | |
680 | return -1; | |
681 | } | |
682 | ||
683 | static int pf_detect(void) | |
684 | { | |
685 | struct pf_unit *pf = units; | |
686 | int k, unit; | |
687 | ||
688 | printk("%s: %s version %s, major %d, cluster %d, nice %d\n", | |
689 | name, name, PF_VERSION, major, cluster, nice); | |
690 | ||
691 | k = 0; | |
692 | if (pf_drive_count == 0) { | |
693 | if (pi_init(pf->pi, 1, -1, -1, -1, -1, -1, pf_scratch, PI_PF, | |
694 | verbose, pf->name)) { | |
695 | if (!pf_probe(pf) && pf->disk) { | |
696 | pf->present = 1; | |
697 | k++; | |
698 | } else | |
699 | pi_release(pf->pi); | |
700 | } | |
701 | ||
702 | } else | |
703 | for (unit = 0; unit < PF_UNITS; unit++, pf++) { | |
704 | int *conf = *drives[unit]; | |
705 | if (!conf[D_PRT]) | |
706 | continue; | |
707 | if (pi_init(pf->pi, 0, conf[D_PRT], conf[D_MOD], | |
708 | conf[D_UNI], conf[D_PRO], conf[D_DLY], | |
709 | pf_scratch, PI_PF, verbose, pf->name)) { | |
8e53cfc8 | 710 | if (pf->disk && !pf_probe(pf)) { |
1da177e4 LT |
711 | pf->present = 1; |
712 | k++; | |
713 | } else | |
714 | pi_release(pf->pi); | |
715 | } | |
716 | } | |
717 | if (k) | |
718 | return 0; | |
719 | ||
720 | printk("%s: No ATAPI disk detected\n", name); | |
721 | for (pf = units, unit = 0; unit < PF_UNITS; pf++, unit++) | |
722 | put_disk(pf->disk); | |
723 | return -1; | |
724 | } | |
725 | ||
726 | /* The i/o request engine */ | |
727 | ||
728 | static int pf_start(struct pf_unit *pf, int cmd, int b, int c) | |
729 | { | |
730 | int i; | |
731 | char io_cmd[12] = { cmd, pf->lun << 5, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }; | |
732 | ||
733 | for (i = 0; i < 4; i++) { | |
734 | io_cmd[5 - i] = b & 0xff; | |
735 | b = b >> 8; | |
736 | } | |
737 | ||
738 | io_cmd[8] = c & 0xff; | |
739 | io_cmd[7] = (c >> 8) & 0xff; | |
740 | ||
741 | i = pf_command(pf, io_cmd, c * 512, "start i/o"); | |
742 | ||
743 | mdelay(1); | |
744 | ||
745 | return i; | |
746 | } | |
747 | ||
748 | static int pf_ready(void) | |
749 | { | |
750 | return (((status_reg(pf_current) & (STAT_BUSY | pf_mask)) == pf_mask)); | |
751 | } | |
752 | ||
753 | static struct request_queue *pf_queue; | |
754 | ||
9564df1f JA |
755 | static void pf_end_request(int uptodate) |
756 | { | |
757 | if (pf_req) { | |
758 | end_request(pf_req, uptodate); | |
759 | pf_req = NULL; | |
760 | } | |
761 | } | |
762 | ||
165125e1 | 763 | static void do_pf_request(struct request_queue * q) |
1da177e4 LT |
764 | { |
765 | if (pf_busy) | |
766 | return; | |
767 | repeat: | |
768 | pf_req = elv_next_request(q); | |
769 | if (!pf_req) | |
770 | return; | |
771 | ||
772 | pf_current = pf_req->rq_disk->private_data; | |
773 | pf_block = pf_req->sector; | |
774 | pf_run = pf_req->nr_sectors; | |
775 | pf_count = pf_req->current_nr_sectors; | |
776 | ||
777 | if (pf_block + pf_count > get_capacity(pf_req->rq_disk)) { | |
9564df1f | 778 | pf_end_request(0); |
1da177e4 LT |
779 | goto repeat; |
780 | } | |
781 | ||
782 | pf_cmd = rq_data_dir(pf_req); | |
783 | pf_buf = pf_req->buffer; | |
784 | pf_retries = 0; | |
785 | ||
786 | pf_busy = 1; | |
787 | if (pf_cmd == READ) | |
788 | pi_do_claimed(pf_current->pi, do_pf_read); | |
789 | else if (pf_cmd == WRITE) | |
790 | pi_do_claimed(pf_current->pi, do_pf_write); | |
791 | else { | |
792 | pf_busy = 0; | |
9564df1f | 793 | pf_end_request(0); |
1da177e4 LT |
794 | goto repeat; |
795 | } | |
796 | } | |
797 | ||
798 | static int pf_next_buf(void) | |
799 | { | |
800 | unsigned long saved_flags; | |
801 | ||
802 | pf_count--; | |
803 | pf_run--; | |
804 | pf_buf += 512; | |
805 | pf_block++; | |
806 | if (!pf_run) | |
807 | return 0; | |
808 | if (!pf_count) | |
809 | return 1; | |
810 | spin_lock_irqsave(&pf_spin_lock, saved_flags); | |
9564df1f | 811 | pf_end_request(1); |
1da177e4 LT |
812 | spin_unlock_irqrestore(&pf_spin_lock, saved_flags); |
813 | return 1; | |
814 | } | |
815 | ||
816 | static inline void next_request(int success) | |
817 | { | |
818 | unsigned long saved_flags; | |
819 | ||
820 | spin_lock_irqsave(&pf_spin_lock, saved_flags); | |
9564df1f | 821 | pf_end_request(success); |
1da177e4 LT |
822 | pf_busy = 0; |
823 | do_pf_request(pf_queue); | |
824 | spin_unlock_irqrestore(&pf_spin_lock, saved_flags); | |
825 | } | |
826 | ||
827 | /* detach from the calling context - in case the spinlock is held */ | |
828 | static void do_pf_read(void) | |
829 | { | |
830 | ps_set_intr(do_pf_read_start, NULL, 0, nice); | |
831 | } | |
832 | ||
833 | static void do_pf_read_start(void) | |
834 | { | |
835 | pf_busy = 1; | |
836 | ||
837 | if (pf_start(pf_current, ATAPI_READ_10, pf_block, pf_run)) { | |
838 | pi_disconnect(pf_current->pi); | |
839 | if (pf_retries < PF_MAX_RETRIES) { | |
840 | pf_retries++; | |
841 | pi_do_claimed(pf_current->pi, do_pf_read_start); | |
842 | return; | |
843 | } | |
844 | next_request(0); | |
845 | return; | |
846 | } | |
847 | pf_mask = STAT_DRQ; | |
848 | ps_set_intr(do_pf_read_drq, pf_ready, PF_TMO, nice); | |
849 | } | |
850 | ||
851 | static void do_pf_read_drq(void) | |
852 | { | |
853 | while (1) { | |
854 | if (pf_wait(pf_current, STAT_BUSY, STAT_DRQ | STAT_ERR, | |
855 | "read block", "completion") & STAT_ERR) { | |
856 | pi_disconnect(pf_current->pi); | |
857 | if (pf_retries < PF_MAX_RETRIES) { | |
858 | pf_req_sense(pf_current, 0); | |
859 | pf_retries++; | |
860 | pi_do_claimed(pf_current->pi, do_pf_read_start); | |
861 | return; | |
862 | } | |
863 | next_request(0); | |
864 | return; | |
865 | } | |
866 | pi_read_block(pf_current->pi, pf_buf, 512); | |
867 | if (pf_next_buf()) | |
868 | break; | |
869 | } | |
870 | pi_disconnect(pf_current->pi); | |
871 | next_request(1); | |
872 | } | |
873 | ||
874 | static void do_pf_write(void) | |
875 | { | |
876 | ps_set_intr(do_pf_write_start, NULL, 0, nice); | |
877 | } | |
878 | ||
879 | static void do_pf_write_start(void) | |
880 | { | |
881 | pf_busy = 1; | |
882 | ||
883 | if (pf_start(pf_current, ATAPI_WRITE_10, pf_block, pf_run)) { | |
884 | pi_disconnect(pf_current->pi); | |
885 | if (pf_retries < PF_MAX_RETRIES) { | |
886 | pf_retries++; | |
887 | pi_do_claimed(pf_current->pi, do_pf_write_start); | |
888 | return; | |
889 | } | |
890 | next_request(0); | |
891 | return; | |
892 | } | |
893 | ||
894 | while (1) { | |
895 | if (pf_wait(pf_current, STAT_BUSY, STAT_DRQ | STAT_ERR, | |
896 | "write block", "data wait") & STAT_ERR) { | |
897 | pi_disconnect(pf_current->pi); | |
898 | if (pf_retries < PF_MAX_RETRIES) { | |
899 | pf_retries++; | |
900 | pi_do_claimed(pf_current->pi, do_pf_write_start); | |
901 | return; | |
902 | } | |
903 | next_request(0); | |
904 | return; | |
905 | } | |
906 | pi_write_block(pf_current->pi, pf_buf, 512); | |
907 | if (pf_next_buf()) | |
908 | break; | |
909 | } | |
910 | pf_mask = 0; | |
911 | ps_set_intr(do_pf_write_done, pf_ready, PF_TMO, nice); | |
912 | } | |
913 | ||
914 | static void do_pf_write_done(void) | |
915 | { | |
916 | if (pf_wait(pf_current, STAT_BUSY, 0, "write block", "done") & STAT_ERR) { | |
917 | pi_disconnect(pf_current->pi); | |
918 | if (pf_retries < PF_MAX_RETRIES) { | |
919 | pf_retries++; | |
920 | pi_do_claimed(pf_current->pi, do_pf_write_start); | |
921 | return; | |
922 | } | |
923 | next_request(0); | |
924 | return; | |
925 | } | |
926 | pi_disconnect(pf_current->pi); | |
927 | next_request(1); | |
928 | } | |
929 | ||
930 | static int __init pf_init(void) | |
931 | { /* preliminary initialisation */ | |
932 | struct pf_unit *pf; | |
933 | int unit; | |
934 | ||
935 | if (disable) | |
8bca98ca | 936 | return -EINVAL; |
1da177e4 LT |
937 | |
938 | pf_init_units(); | |
939 | ||
940 | if (pf_detect()) | |
8bca98ca | 941 | return -ENODEV; |
1da177e4 LT |
942 | pf_busy = 0; |
943 | ||
944 | if (register_blkdev(major, name)) { | |
945 | for (pf = units, unit = 0; unit < PF_UNITS; pf++, unit++) | |
946 | put_disk(pf->disk); | |
8bca98ca | 947 | return -EBUSY; |
1da177e4 LT |
948 | } |
949 | pf_queue = blk_init_queue(do_pf_request, &pf_spin_lock); | |
950 | if (!pf_queue) { | |
951 | unregister_blkdev(major, name); | |
952 | for (pf = units, unit = 0; unit < PF_UNITS; pf++, unit++) | |
953 | put_disk(pf->disk); | |
8bca98ca | 954 | return -ENOMEM; |
1da177e4 LT |
955 | } |
956 | ||
957 | blk_queue_max_phys_segments(pf_queue, cluster); | |
958 | blk_queue_max_hw_segments(pf_queue, cluster); | |
959 | ||
960 | for (pf = units, unit = 0; unit < PF_UNITS; pf++, unit++) { | |
961 | struct gendisk *disk = pf->disk; | |
962 | ||
963 | if (!pf->present) | |
964 | continue; | |
965 | disk->private_data = pf; | |
966 | disk->queue = pf_queue; | |
967 | add_disk(disk); | |
968 | } | |
969 | return 0; | |
970 | } | |
971 | ||
972 | static void __exit pf_exit(void) | |
973 | { | |
974 | struct pf_unit *pf; | |
975 | int unit; | |
976 | unregister_blkdev(major, name); | |
977 | for (pf = units, unit = 0; unit < PF_UNITS; pf++, unit++) { | |
978 | if (!pf->present) | |
979 | continue; | |
980 | del_gendisk(pf->disk); | |
981 | put_disk(pf->disk); | |
982 | pi_release(pf->pi); | |
983 | } | |
984 | blk_cleanup_queue(pf_queue); | |
985 | } | |
986 | ||
987 | MODULE_LICENSE("GPL"); | |
988 | module_init(pf_init) | |
989 | module_exit(pf_exit) |