Commit | Line | Data |
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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 | ||
505d3085 | 62 | major You may use this parameter to override the |
1da177e4 LT |
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 | ||
90ab5ee9 RR |
121 | #include <linux/types.h> |
122 | ||
1da177e4 LT |
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 | ||
90ab5ee9 | 129 | static bool verbose = 0; |
1da177e4 LT |
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> | |
77218ddf | 155 | #include <linux/blk-mq.h> |
1da177e4 | 156 | #include <linux/blkpg.h> |
2a48fc0a | 157 | #include <linux/mutex.h> |
7c0f6ba6 | 158 | #include <linux/uaccess.h> |
1da177e4 | 159 | |
2a48fc0a | 160 | static DEFINE_MUTEX(pf_mutex); |
671d40f4 | 161 | static DEFINE_SPINLOCK(pf_spin_lock); |
1da177e4 LT |
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 | ||
8cfc7ca4 | 208 | static int pf_open(struct block_device *bdev, fmode_t mode); |
77218ddf JA |
209 | static blk_status_t pf_queue_rq(struct blk_mq_hw_ctx *hctx, |
210 | const struct blk_mq_queue_data *bd); | |
8cfc7ca4 | 211 | static int pf_ioctl(struct block_device *bdev, fmode_t mode, |
1da177e4 | 212 | unsigned int cmd, unsigned long arg); |
a885c8c4 | 213 | static int pf_getgeo(struct block_device *bdev, struct hd_geometry *geo); |
1da177e4 | 214 | |
db2a144b | 215 | static void pf_release(struct gendisk *disk, fmode_t mode); |
1da177e4 LT |
216 | |
217 | static int pf_detect(void); | |
218 | static void do_pf_read(void); | |
219 | static void do_pf_read_start(void); | |
220 | static void do_pf_write(void); | |
221 | static void do_pf_write_start(void); | |
222 | static void do_pf_read_drq(void); | |
223 | static void do_pf_write_done(void); | |
224 | ||
225 | #define PF_NM 0 | |
226 | #define PF_RO 1 | |
227 | #define PF_RW 2 | |
228 | ||
229 | #define PF_NAMELEN 8 | |
230 | ||
231 | struct pf_unit { | |
232 | struct pi_adapter pia; /* interface to paride layer */ | |
233 | struct pi_adapter *pi; | |
234 | int removable; /* removable media device ? */ | |
235 | int media_status; /* media present ? WP ? */ | |
236 | int drive; /* drive */ | |
237 | int lun; | |
238 | int access; /* count of active opens ... */ | |
239 | int present; /* device present ? */ | |
240 | char name[PF_NAMELEN]; /* pf0, pf1, ... */ | |
241 | struct gendisk *disk; | |
77218ddf JA |
242 | struct blk_mq_tag_set tag_set; |
243 | struct list_head rq_list; | |
1da177e4 LT |
244 | }; |
245 | ||
246 | static struct pf_unit units[PF_UNITS]; | |
247 | ||
248 | static int pf_identify(struct pf_unit *pf); | |
249 | static void pf_lock(struct pf_unit *pf, int func); | |
250 | static void pf_eject(struct pf_unit *pf); | |
b1b56b93 TH |
251 | static unsigned int pf_check_events(struct gendisk *disk, |
252 | unsigned int clearing); | |
1da177e4 LT |
253 | |
254 | static char pf_scratch[512]; /* scratch block buffer */ | |
255 | ||
256 | /* the variables below are used mainly in the I/O request engine, which | |
257 | processes only one request at a time. | |
258 | */ | |
259 | ||
260 | static int pf_retries = 0; /* i/o error retry count */ | |
261 | static int pf_busy = 0; /* request being processed ? */ | |
262 | static struct request *pf_req; /* current request */ | |
263 | static int pf_block; /* address of next requested block */ | |
264 | static int pf_count; /* number of blocks still to do */ | |
265 | static int pf_run; /* sectors in current cluster */ | |
266 | static int pf_cmd; /* current command READ/WRITE */ | |
267 | static struct pf_unit *pf_current;/* unit of current request */ | |
268 | static int pf_mask; /* stopper for pseudo-int */ | |
269 | static char *pf_buf; /* buffer for request in progress */ | |
9f4ba6b0 | 270 | static void *par_drv; /* reference of parport driver */ |
1da177e4 LT |
271 | |
272 | /* kernel glue structures */ | |
273 | ||
83d5cde4 | 274 | static const struct block_device_operations pf_fops = { |
1da177e4 | 275 | .owner = THIS_MODULE, |
8cfc7ca4 AV |
276 | .open = pf_open, |
277 | .release = pf_release, | |
8a6cfeb6 | 278 | .ioctl = pf_ioctl, |
9452b1a3 | 279 | .compat_ioctl = pf_ioctl, |
a885c8c4 | 280 | .getgeo = pf_getgeo, |
b1b56b93 | 281 | .check_events = pf_check_events, |
1da177e4 LT |
282 | }; |
283 | ||
77218ddf JA |
284 | static const struct blk_mq_ops pf_mq_ops = { |
285 | .queue_rq = pf_queue_rq, | |
286 | }; | |
287 | ||
1da177e4 LT |
288 | static void __init pf_init_units(void) |
289 | { | |
290 | struct pf_unit *pf; | |
291 | int unit; | |
292 | ||
293 | pf_drive_count = 0; | |
294 | for (unit = 0, pf = units; unit < PF_UNITS; unit++, pf++) { | |
77218ddf JA |
295 | struct gendisk *disk; |
296 | ||
c684b577 CH |
297 | if (blk_mq_alloc_sq_tag_set(&pf->tag_set, &pf_mq_ops, 1, |
298 | BLK_MQ_F_SHOULD_MERGE)) | |
1da177e4 | 299 | continue; |
77218ddf | 300 | |
c684b577 CH |
301 | disk = blk_mq_alloc_disk(&pf->tag_set, pf); |
302 | if (IS_ERR(disk)) { | |
303 | blk_mq_free_tag_set(&pf->tag_set); | |
77218ddf | 304 | continue; |
3a644142 | 305 | } |
77218ddf JA |
306 | |
307 | INIT_LIST_HEAD(&pf->rq_list); | |
3a644142 | 308 | blk_queue_max_segments(disk->queue, cluster); |
8fc45044 | 309 | blk_queue_bounce_limit(disk->queue, BLK_BOUNCE_HIGH); |
1da177e4 LT |
310 | pf->disk = disk; |
311 | pf->pi = &pf->pia; | |
312 | pf->media_status = PF_NM; | |
313 | pf->drive = (*drives[unit])[D_SLV]; | |
314 | pf->lun = (*drives[unit])[D_LUN]; | |
315 | snprintf(pf->name, PF_NAMELEN, "%s%d", name, unit); | |
316 | disk->major = major; | |
317 | disk->first_minor = unit; | |
c684b577 | 318 | disk->minors = 1; |
1da177e4 LT |
319 | strcpy(disk->disk_name, pf->name); |
320 | disk->fops = &pf_fops; | |
773008f6 | 321 | disk->events = DISK_EVENT_MEDIA_CHANGE; |
1da177e4 LT |
322 | if (!(*drives[unit])[D_PRT]) |
323 | pf_drive_count++; | |
324 | } | |
325 | } | |
326 | ||
8cfc7ca4 | 327 | static int pf_open(struct block_device *bdev, fmode_t mode) |
1da177e4 | 328 | { |
8cfc7ca4 | 329 | struct pf_unit *pf = bdev->bd_disk->private_data; |
6e9624b8 | 330 | int ret; |
1da177e4 | 331 | |
2a48fc0a | 332 | mutex_lock(&pf_mutex); |
1da177e4 LT |
333 | pf_identify(pf); |
334 | ||
6e9624b8 | 335 | ret = -ENODEV; |
1da177e4 | 336 | if (pf->media_status == PF_NM) |
6e9624b8 | 337 | goto out; |
1da177e4 | 338 | |
6e9624b8 | 339 | ret = -EROFS; |
8cfc7ca4 | 340 | if ((pf->media_status == PF_RO) && (mode & FMODE_WRITE)) |
6e9624b8 | 341 | goto out; |
1da177e4 | 342 | |
6e9624b8 | 343 | ret = 0; |
1da177e4 LT |
344 | pf->access++; |
345 | if (pf->removable) | |
346 | pf_lock(pf, 1); | |
6e9624b8 | 347 | out: |
2a48fc0a | 348 | mutex_unlock(&pf_mutex); |
6e9624b8 | 349 | return ret; |
1da177e4 LT |
350 | } |
351 | ||
a885c8c4 | 352 | static int pf_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
1da177e4 | 353 | { |
a885c8c4 CH |
354 | struct pf_unit *pf = bdev->bd_disk->private_data; |
355 | sector_t capacity = get_capacity(pf->disk); | |
356 | ||
1da177e4 | 357 | if (capacity < PF_FD_MAX) { |
a885c8c4 CH |
358 | geo->cylinders = sector_div(capacity, PF_FD_HDS * PF_FD_SPT); |
359 | geo->heads = PF_FD_HDS; | |
360 | geo->sectors = PF_FD_SPT; | |
1da177e4 | 361 | } else { |
a885c8c4 CH |
362 | geo->cylinders = sector_div(capacity, PF_HD_HDS * PF_HD_SPT); |
363 | geo->heads = PF_HD_HDS; | |
364 | geo->sectors = PF_HD_SPT; | |
1da177e4 | 365 | } |
a885c8c4 CH |
366 | |
367 | return 0; | |
368 | } | |
369 | ||
8cfc7ca4 | 370 | static int pf_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd, unsigned long arg) |
a885c8c4 | 371 | { |
8cfc7ca4 | 372 | struct pf_unit *pf = bdev->bd_disk->private_data; |
a885c8c4 CH |
373 | |
374 | if (cmd != CDROMEJECT) | |
375 | return -EINVAL; | |
376 | ||
377 | if (pf->access != 1) | |
378 | return -EBUSY; | |
2a48fc0a | 379 | mutex_lock(&pf_mutex); |
a885c8c4 | 380 | pf_eject(pf); |
2a48fc0a | 381 | mutex_unlock(&pf_mutex); |
8a6cfeb6 | 382 | |
1da177e4 LT |
383 | return 0; |
384 | } | |
385 | ||
db2a144b | 386 | static void pf_release(struct gendisk *disk, fmode_t mode) |
1da177e4 | 387 | { |
8cfc7ca4 | 388 | struct pf_unit *pf = disk->private_data; |
1da177e4 | 389 | |
2a48fc0a | 390 | mutex_lock(&pf_mutex); |
6e9624b8 | 391 | if (pf->access <= 0) { |
2a48fc0a | 392 | mutex_unlock(&pf_mutex); |
db2a144b AV |
393 | WARN_ON(1); |
394 | return; | |
6e9624b8 | 395 | } |
1da177e4 LT |
396 | |
397 | pf->access--; | |
398 | ||
399 | if (!pf->access && pf->removable) | |
400 | pf_lock(pf, 0); | |
401 | ||
2a48fc0a | 402 | mutex_unlock(&pf_mutex); |
1da177e4 LT |
403 | } |
404 | ||
b1b56b93 | 405 | static unsigned int pf_check_events(struct gendisk *disk, unsigned int clearing) |
1da177e4 | 406 | { |
b1b56b93 | 407 | return DISK_EVENT_MEDIA_CHANGE; |
1da177e4 LT |
408 | } |
409 | ||
410 | static inline int status_reg(struct pf_unit *pf) | |
411 | { | |
412 | return pi_read_regr(pf->pi, 1, 6); | |
413 | } | |
414 | ||
415 | static inline int read_reg(struct pf_unit *pf, int reg) | |
416 | { | |
417 | return pi_read_regr(pf->pi, 0, reg); | |
418 | } | |
419 | ||
420 | static inline void write_reg(struct pf_unit *pf, int reg, int val) | |
421 | { | |
422 | pi_write_regr(pf->pi, 0, reg, val); | |
423 | } | |
424 | ||
425 | static int pf_wait(struct pf_unit *pf, int go, int stop, char *fun, char *msg) | |
426 | { | |
427 | int j, r, e, s, p; | |
428 | ||
429 | j = 0; | |
430 | while ((((r = status_reg(pf)) & go) || (stop && (!(r & stop)))) | |
431 | && (j++ < PF_SPIN)) | |
432 | udelay(PF_SPIN_DEL); | |
433 | ||
c12ec0a2 | 434 | if ((r & (STAT_ERR & stop)) || (j > PF_SPIN)) { |
1da177e4 LT |
435 | s = read_reg(pf, 7); |
436 | e = read_reg(pf, 1); | |
437 | p = read_reg(pf, 2); | |
c12ec0a2 | 438 | if (j > PF_SPIN) |
1da177e4 LT |
439 | e |= 0x100; |
440 | if (fun) | |
441 | printk("%s: %s %s: alt=0x%x stat=0x%x err=0x%x" | |
442 | " loop=%d phase=%d\n", | |
443 | pf->name, fun, msg, r, s, e, j, p); | |
444 | return (e << 8) + s; | |
445 | } | |
446 | return 0; | |
447 | } | |
448 | ||
449 | static int pf_command(struct pf_unit *pf, char *cmd, int dlen, char *fun) | |
450 | { | |
451 | pi_connect(pf->pi); | |
452 | ||
453 | write_reg(pf, 6, 0xa0+0x10*pf->drive); | |
454 | ||
455 | if (pf_wait(pf, STAT_BUSY | STAT_DRQ, 0, fun, "before command")) { | |
456 | pi_disconnect(pf->pi); | |
457 | return -1; | |
458 | } | |
459 | ||
460 | write_reg(pf, 4, dlen % 256); | |
461 | write_reg(pf, 5, dlen / 256); | |
462 | write_reg(pf, 7, 0xa0); /* ATAPI packet command */ | |
463 | ||
464 | if (pf_wait(pf, STAT_BUSY, STAT_DRQ, fun, "command DRQ")) { | |
465 | pi_disconnect(pf->pi); | |
466 | return -1; | |
467 | } | |
468 | ||
469 | if (read_reg(pf, 2) != 1) { | |
470 | printk("%s: %s: command phase error\n", pf->name, fun); | |
471 | pi_disconnect(pf->pi); | |
472 | return -1; | |
473 | } | |
474 | ||
475 | pi_write_block(pf->pi, cmd, 12); | |
476 | ||
477 | return 0; | |
478 | } | |
479 | ||
480 | static int pf_completion(struct pf_unit *pf, char *buf, char *fun) | |
481 | { | |
482 | int r, s, n; | |
483 | ||
484 | r = pf_wait(pf, STAT_BUSY, STAT_DRQ | STAT_READY | STAT_ERR, | |
485 | fun, "completion"); | |
486 | ||
487 | if ((read_reg(pf, 2) & 2) && (read_reg(pf, 7) & STAT_DRQ)) { | |
488 | n = (((read_reg(pf, 4) + 256 * read_reg(pf, 5)) + | |
489 | 3) & 0xfffc); | |
490 | pi_read_block(pf->pi, buf, n); | |
491 | } | |
492 | ||
493 | s = pf_wait(pf, STAT_BUSY, STAT_READY | STAT_ERR, fun, "data done"); | |
494 | ||
495 | pi_disconnect(pf->pi); | |
496 | ||
497 | return (r ? r : s); | |
498 | } | |
499 | ||
500 | static void pf_req_sense(struct pf_unit *pf, int quiet) | |
501 | { | |
502 | char rs_cmd[12] = | |
503 | { ATAPI_REQ_SENSE, pf->lun << 5, 0, 0, 16, 0, 0, 0, 0, 0, 0, 0 }; | |
504 | char buf[16]; | |
505 | int r; | |
506 | ||
507 | r = pf_command(pf, rs_cmd, 16, "Request sense"); | |
508 | mdelay(1); | |
509 | if (!r) | |
510 | pf_completion(pf, buf, "Request sense"); | |
511 | ||
512 | if ((!r) && (!quiet)) | |
513 | printk("%s: Sense key: %x, ASC: %x, ASQ: %x\n", | |
514 | pf->name, buf[2] & 0xf, buf[12], buf[13]); | |
515 | } | |
516 | ||
517 | static int pf_atapi(struct pf_unit *pf, char *cmd, int dlen, char *buf, char *fun) | |
518 | { | |
519 | int r; | |
520 | ||
521 | r = pf_command(pf, cmd, dlen, fun); | |
522 | mdelay(1); | |
523 | if (!r) | |
524 | r = pf_completion(pf, buf, fun); | |
525 | if (r) | |
526 | pf_req_sense(pf, !fun); | |
527 | ||
528 | return r; | |
529 | } | |
530 | ||
1da177e4 LT |
531 | static void pf_lock(struct pf_unit *pf, int func) |
532 | { | |
533 | char lo_cmd[12] = { ATAPI_LOCK, pf->lun << 5, 0, 0, func, 0, 0, 0, 0, 0, 0, 0 }; | |
534 | ||
e62aa046 | 535 | pf_atapi(pf, lo_cmd, 0, pf_scratch, func ? "lock" : "unlock"); |
1da177e4 LT |
536 | } |
537 | ||
538 | static void pf_eject(struct pf_unit *pf) | |
539 | { | |
540 | char ej_cmd[12] = { ATAPI_DOOR, pf->lun << 5, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0 }; | |
541 | ||
542 | pf_lock(pf, 0); | |
543 | pf_atapi(pf, ej_cmd, 0, pf_scratch, "eject"); | |
544 | } | |
545 | ||
546 | #define PF_RESET_TMO 30 /* in tenths of a second */ | |
547 | ||
548 | static void pf_sleep(int cs) | |
549 | { | |
86e84862 | 550 | schedule_timeout_interruptible(cs); |
1da177e4 LT |
551 | } |
552 | ||
553 | /* the ATAPI standard actually specifies the contents of all 7 registers | |
554 | after a reset, but the specification is ambiguous concerning the last | |
555 | two bytes, and different drives interpret the standard differently. | |
556 | */ | |
557 | ||
558 | static int pf_reset(struct pf_unit *pf) | |
559 | { | |
560 | int i, k, flg; | |
561 | int expect[5] = { 1, 1, 1, 0x14, 0xeb }; | |
562 | ||
563 | pi_connect(pf->pi); | |
564 | write_reg(pf, 6, 0xa0+0x10*pf->drive); | |
565 | write_reg(pf, 7, 8); | |
566 | ||
567 | pf_sleep(20 * HZ / 1000); | |
568 | ||
569 | k = 0; | |
570 | while ((k++ < PF_RESET_TMO) && (status_reg(pf) & STAT_BUSY)) | |
571 | pf_sleep(HZ / 10); | |
572 | ||
573 | flg = 1; | |
574 | for (i = 0; i < 5; i++) | |
575 | flg &= (read_reg(pf, i + 1) == expect[i]); | |
576 | ||
577 | if (verbose) { | |
578 | printk("%s: Reset (%d) signature = ", pf->name, k); | |
579 | for (i = 0; i < 5; i++) | |
580 | printk("%3x", read_reg(pf, i + 1)); | |
581 | if (!flg) | |
582 | printk(" (incorrect)"); | |
583 | printk("\n"); | |
584 | } | |
585 | ||
586 | pi_disconnect(pf->pi); | |
587 | return flg - 1; | |
588 | } | |
589 | ||
590 | static void pf_mode_sense(struct pf_unit *pf) | |
591 | { | |
592 | char ms_cmd[12] = | |
593 | { ATAPI_MODE_SENSE, pf->lun << 5, 0, 0, 0, 0, 0, 0, 8, 0, 0, 0 }; | |
594 | char buf[8]; | |
595 | ||
e62aa046 | 596 | pf_atapi(pf, ms_cmd, 8, buf, "mode sense"); |
1da177e4 LT |
597 | pf->media_status = PF_RW; |
598 | if (buf[3] & 0x80) | |
599 | pf->media_status = PF_RO; | |
600 | } | |
601 | ||
602 | static void xs(char *buf, char *targ, int offs, int len) | |
603 | { | |
604 | int j, k, l; | |
605 | ||
606 | j = 0; | |
607 | l = 0; | |
608 | for (k = 0; k < len; k++) | |
609 | if ((buf[k + offs] != 0x20) || (buf[k + offs] != l)) | |
610 | l = targ[j++] = buf[k + offs]; | |
611 | if (l == 0x20) | |
612 | j--; | |
613 | targ[j] = 0; | |
614 | } | |
615 | ||
616 | static int xl(char *buf, int offs) | |
617 | { | |
618 | int v, k; | |
619 | ||
620 | v = 0; | |
621 | for (k = 0; k < 4; k++) | |
622 | v = v * 256 + (buf[k + offs] & 0xff); | |
623 | return v; | |
624 | } | |
625 | ||
626 | static void pf_get_capacity(struct pf_unit *pf) | |
627 | { | |
628 | char rc_cmd[12] = { ATAPI_CAPACITY, pf->lun << 5, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }; | |
629 | char buf[8]; | |
630 | int bs; | |
631 | ||
e62aa046 | 632 | if (pf_atapi(pf, rc_cmd, 8, buf, "get capacity")) { |
1da177e4 LT |
633 | pf->media_status = PF_NM; |
634 | return; | |
635 | } | |
636 | set_capacity(pf->disk, xl(buf, 0) + 1); | |
637 | bs = xl(buf, 4); | |
638 | if (bs != 512) { | |
639 | set_capacity(pf->disk, 0); | |
640 | if (verbose) | |
641 | printk("%s: Drive %d, LUN %d," | |
642 | " unsupported block size %d\n", | |
643 | pf->name, pf->drive, pf->lun, bs); | |
644 | } | |
645 | } | |
646 | ||
647 | static int pf_identify(struct pf_unit *pf) | |
648 | { | |
649 | int dt, s; | |
650 | char *ms[2] = { "master", "slave" }; | |
651 | char mf[10], id[18]; | |
652 | char id_cmd[12] = | |
653 | { ATAPI_IDENTIFY, pf->lun << 5, 0, 0, 36, 0, 0, 0, 0, 0, 0, 0 }; | |
654 | char buf[36]; | |
655 | ||
656 | s = pf_atapi(pf, id_cmd, 36, buf, "identify"); | |
657 | if (s) | |
658 | return -1; | |
659 | ||
660 | dt = buf[0] & 0x1f; | |
661 | if ((dt != 0) && (dt != 7)) { | |
662 | if (verbose) | |
663 | printk("%s: Drive %d, LUN %d, unsupported type %d\n", | |
664 | pf->name, pf->drive, pf->lun, dt); | |
665 | return -1; | |
666 | } | |
667 | ||
668 | xs(buf, mf, 8, 8); | |
669 | xs(buf, id, 16, 16); | |
670 | ||
671 | pf->removable = (buf[1] & 0x80); | |
672 | ||
673 | pf_mode_sense(pf); | |
674 | pf_mode_sense(pf); | |
675 | pf_mode_sense(pf); | |
676 | ||
677 | pf_get_capacity(pf); | |
678 | ||
679 | printk("%s: %s %s, %s LUN %d, type %d", | |
680 | pf->name, mf, id, ms[pf->drive], pf->lun, dt); | |
681 | if (pf->removable) | |
682 | printk(", removable"); | |
683 | if (pf->media_status == PF_NM) | |
684 | printk(", no media\n"); | |
685 | else { | |
686 | if (pf->media_status == PF_RO) | |
687 | printk(", RO"); | |
688 | printk(", %llu blocks\n", | |
689 | (unsigned long long)get_capacity(pf->disk)); | |
690 | } | |
691 | return 0; | |
692 | } | |
693 | ||
694 | /* returns 0, with id set if drive is detected | |
695 | -1, if drive detection failed | |
696 | */ | |
697 | static int pf_probe(struct pf_unit *pf) | |
698 | { | |
699 | if (pf->drive == -1) { | |
700 | for (pf->drive = 0; pf->drive <= 1; pf->drive++) | |
701 | if (!pf_reset(pf)) { | |
702 | if (pf->lun != -1) | |
703 | return pf_identify(pf); | |
704 | else | |
705 | for (pf->lun = 0; pf->lun < 8; pf->lun++) | |
706 | if (!pf_identify(pf)) | |
707 | return 0; | |
708 | } | |
709 | } else { | |
710 | if (pf_reset(pf)) | |
711 | return -1; | |
712 | if (pf->lun != -1) | |
713 | return pf_identify(pf); | |
714 | for (pf->lun = 0; pf->lun < 8; pf->lun++) | |
715 | if (!pf_identify(pf)) | |
716 | return 0; | |
717 | } | |
718 | return -1; | |
719 | } | |
720 | ||
721 | static int pf_detect(void) | |
722 | { | |
723 | struct pf_unit *pf = units; | |
724 | int k, unit; | |
725 | ||
726 | printk("%s: %s version %s, major %d, cluster %d, nice %d\n", | |
727 | name, name, PF_VERSION, major, cluster, nice); | |
728 | ||
9f4ba6b0 SM |
729 | par_drv = pi_register_driver(name); |
730 | if (!par_drv) { | |
731 | pr_err("failed to register %s driver\n", name); | |
732 | return -1; | |
733 | } | |
1da177e4 LT |
734 | k = 0; |
735 | if (pf_drive_count == 0) { | |
736 | if (pi_init(pf->pi, 1, -1, -1, -1, -1, -1, pf_scratch, PI_PF, | |
737 | verbose, pf->name)) { | |
738 | if (!pf_probe(pf) && pf->disk) { | |
739 | pf->present = 1; | |
740 | k++; | |
741 | } else | |
742 | pi_release(pf->pi); | |
743 | } | |
744 | ||
745 | } else | |
746 | for (unit = 0; unit < PF_UNITS; unit++, pf++) { | |
747 | int *conf = *drives[unit]; | |
748 | if (!conf[D_PRT]) | |
749 | continue; | |
750 | if (pi_init(pf->pi, 0, conf[D_PRT], conf[D_MOD], | |
751 | conf[D_UNI], conf[D_PRO], conf[D_DLY], | |
752 | pf_scratch, PI_PF, verbose, pf->name)) { | |
8e53cfc8 | 753 | if (pf->disk && !pf_probe(pf)) { |
1da177e4 LT |
754 | pf->present = 1; |
755 | k++; | |
756 | } else | |
757 | pi_release(pf->pi); | |
758 | } | |
759 | } | |
760 | if (k) | |
761 | return 0; | |
762 | ||
763 | printk("%s: No ATAPI disk detected\n", name); | |
6ce59025 | 764 | for (pf = units, unit = 0; unit < PF_UNITS; pf++, unit++) { |
58ccd2d3 Y |
765 | if (!pf->disk) |
766 | continue; | |
c684b577 | 767 | blk_cleanup_disk(pf->disk); |
6ce59025 | 768 | blk_mq_free_tag_set(&pf->tag_set); |
6ce59025 | 769 | } |
9f4ba6b0 | 770 | pi_unregister_driver(par_drv); |
1da177e4 LT |
771 | return -1; |
772 | } | |
773 | ||
774 | /* The i/o request engine */ | |
775 | ||
776 | static int pf_start(struct pf_unit *pf, int cmd, int b, int c) | |
777 | { | |
778 | int i; | |
779 | char io_cmd[12] = { cmd, pf->lun << 5, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }; | |
780 | ||
781 | for (i = 0; i < 4; i++) { | |
782 | io_cmd[5 - i] = b & 0xff; | |
783 | b = b >> 8; | |
784 | } | |
785 | ||
786 | io_cmd[8] = c & 0xff; | |
787 | io_cmd[7] = (c >> 8) & 0xff; | |
788 | ||
789 | i = pf_command(pf, io_cmd, c * 512, "start i/o"); | |
790 | ||
791 | mdelay(1); | |
792 | ||
793 | return i; | |
794 | } | |
795 | ||
796 | static int pf_ready(void) | |
797 | { | |
798 | return (((status_reg(pf_current) & (STAT_BUSY | pf_mask)) == pf_mask)); | |
799 | } | |
800 | ||
3a644142 OS |
801 | static int pf_queue; |
802 | ||
803 | static int set_next_request(void) | |
804 | { | |
805 | struct pf_unit *pf; | |
3a644142 OS |
806 | int old_pos = pf_queue; |
807 | ||
808 | do { | |
809 | pf = &units[pf_queue]; | |
3a644142 OS |
810 | if (++pf_queue == PF_UNITS) |
811 | pf_queue = 0; | |
77218ddf JA |
812 | if (pf->present && !list_empty(&pf->rq_list)) { |
813 | pf_req = list_first_entry(&pf->rq_list, struct request, | |
814 | queuelist); | |
815 | list_del_init(&pf_req->queuelist); | |
816 | blk_mq_start_request(pf_req); | |
817 | break; | |
3a644142 OS |
818 | } |
819 | } while (pf_queue != old_pos); | |
820 | ||
821 | return pf_req != NULL; | |
822 | } | |
1da177e4 | 823 | |
2a842aca | 824 | static void pf_end_request(blk_status_t err) |
9564df1f | 825 | { |
77218ddf JA |
826 | if (!pf_req) |
827 | return; | |
828 | if (!blk_update_request(pf_req, err, blk_rq_cur_bytes(pf_req))) { | |
829 | __blk_mq_end_request(pf_req, err); | |
9564df1f | 830 | pf_req = NULL; |
77218ddf | 831 | } |
9564df1f JA |
832 | } |
833 | ||
3a644142 | 834 | static void pf_request(void) |
1da177e4 LT |
835 | { |
836 | if (pf_busy) | |
837 | return; | |
838 | repeat: | |
3a644142 OS |
839 | if (!pf_req && !set_next_request()) |
840 | return; | |
1da177e4 LT |
841 | |
842 | pf_current = pf_req->rq_disk->private_data; | |
83096ebf TH |
843 | pf_block = blk_rq_pos(pf_req); |
844 | pf_run = blk_rq_sectors(pf_req); | |
845 | pf_count = blk_rq_cur_sectors(pf_req); | |
1da177e4 LT |
846 | |
847 | if (pf_block + pf_count > get_capacity(pf_req->rq_disk)) { | |
2a842aca | 848 | pf_end_request(BLK_STS_IOERR); |
1da177e4 LT |
849 | goto repeat; |
850 | } | |
851 | ||
852 | pf_cmd = rq_data_dir(pf_req); | |
b4f42e28 | 853 | pf_buf = bio_data(pf_req->bio); |
1da177e4 LT |
854 | pf_retries = 0; |
855 | ||
856 | pf_busy = 1; | |
857 | if (pf_cmd == READ) | |
858 | pi_do_claimed(pf_current->pi, do_pf_read); | |
859 | else if (pf_cmd == WRITE) | |
860 | pi_do_claimed(pf_current->pi, do_pf_write); | |
861 | else { | |
862 | pf_busy = 0; | |
2a842aca | 863 | pf_end_request(BLK_STS_IOERR); |
1da177e4 LT |
864 | goto repeat; |
865 | } | |
866 | } | |
867 | ||
77218ddf JA |
868 | static blk_status_t pf_queue_rq(struct blk_mq_hw_ctx *hctx, |
869 | const struct blk_mq_queue_data *bd) | |
3a644142 | 870 | { |
77218ddf JA |
871 | struct pf_unit *pf = hctx->queue->queuedata; |
872 | ||
873 | spin_lock_irq(&pf_spin_lock); | |
874 | list_add_tail(&bd->rq->queuelist, &pf->rq_list); | |
3a644142 | 875 | pf_request(); |
77218ddf JA |
876 | spin_unlock_irq(&pf_spin_lock); |
877 | ||
878 | return BLK_STS_OK; | |
3a644142 OS |
879 | } |
880 | ||
1da177e4 LT |
881 | static int pf_next_buf(void) |
882 | { | |
883 | unsigned long saved_flags; | |
884 | ||
885 | pf_count--; | |
886 | pf_run--; | |
887 | pf_buf += 512; | |
888 | pf_block++; | |
889 | if (!pf_run) | |
1da177e4 | 890 | return 1; |
e62aa046 OZ |
891 | if (!pf_count) { |
892 | spin_lock_irqsave(&pf_spin_lock, saved_flags); | |
f06d9a2b | 893 | pf_end_request(0); |
e62aa046 OZ |
894 | spin_unlock_irqrestore(&pf_spin_lock, saved_flags); |
895 | if (!pf_req) | |
896 | return 1; | |
83096ebf | 897 | pf_count = blk_rq_cur_sectors(pf_req); |
b4f42e28 | 898 | pf_buf = bio_data(pf_req->bio); |
e62aa046 OZ |
899 | } |
900 | return 0; | |
1da177e4 LT |
901 | } |
902 | ||
2a842aca | 903 | static inline void next_request(blk_status_t err) |
1da177e4 LT |
904 | { |
905 | unsigned long saved_flags; | |
906 | ||
907 | spin_lock_irqsave(&pf_spin_lock, saved_flags); | |
f06d9a2b | 908 | pf_end_request(err); |
1da177e4 | 909 | pf_busy = 0; |
3a644142 | 910 | pf_request(); |
1da177e4 LT |
911 | spin_unlock_irqrestore(&pf_spin_lock, saved_flags); |
912 | } | |
913 | ||
914 | /* detach from the calling context - in case the spinlock is held */ | |
915 | static void do_pf_read(void) | |
916 | { | |
917 | ps_set_intr(do_pf_read_start, NULL, 0, nice); | |
918 | } | |
919 | ||
920 | static void do_pf_read_start(void) | |
921 | { | |
922 | pf_busy = 1; | |
923 | ||
924 | if (pf_start(pf_current, ATAPI_READ_10, pf_block, pf_run)) { | |
925 | pi_disconnect(pf_current->pi); | |
926 | if (pf_retries < PF_MAX_RETRIES) { | |
927 | pf_retries++; | |
928 | pi_do_claimed(pf_current->pi, do_pf_read_start); | |
929 | return; | |
930 | } | |
2a842aca | 931 | next_request(BLK_STS_IOERR); |
1da177e4 LT |
932 | return; |
933 | } | |
934 | pf_mask = STAT_DRQ; | |
935 | ps_set_intr(do_pf_read_drq, pf_ready, PF_TMO, nice); | |
936 | } | |
937 | ||
938 | static void do_pf_read_drq(void) | |
939 | { | |
940 | while (1) { | |
941 | if (pf_wait(pf_current, STAT_BUSY, STAT_DRQ | STAT_ERR, | |
942 | "read block", "completion") & STAT_ERR) { | |
943 | pi_disconnect(pf_current->pi); | |
944 | if (pf_retries < PF_MAX_RETRIES) { | |
945 | pf_req_sense(pf_current, 0); | |
946 | pf_retries++; | |
947 | pi_do_claimed(pf_current->pi, do_pf_read_start); | |
948 | return; | |
949 | } | |
2a842aca | 950 | next_request(BLK_STS_IOERR); |
1da177e4 LT |
951 | return; |
952 | } | |
953 | pi_read_block(pf_current->pi, pf_buf, 512); | |
954 | if (pf_next_buf()) | |
955 | break; | |
956 | } | |
957 | pi_disconnect(pf_current->pi); | |
f06d9a2b | 958 | next_request(0); |
1da177e4 LT |
959 | } |
960 | ||
961 | static void do_pf_write(void) | |
962 | { | |
963 | ps_set_intr(do_pf_write_start, NULL, 0, nice); | |
964 | } | |
965 | ||
966 | static void do_pf_write_start(void) | |
967 | { | |
968 | pf_busy = 1; | |
969 | ||
970 | if (pf_start(pf_current, ATAPI_WRITE_10, pf_block, pf_run)) { | |
971 | pi_disconnect(pf_current->pi); | |
972 | if (pf_retries < PF_MAX_RETRIES) { | |
973 | pf_retries++; | |
974 | pi_do_claimed(pf_current->pi, do_pf_write_start); | |
975 | return; | |
976 | } | |
2a842aca | 977 | next_request(BLK_STS_IOERR); |
1da177e4 LT |
978 | return; |
979 | } | |
980 | ||
981 | while (1) { | |
982 | if (pf_wait(pf_current, STAT_BUSY, STAT_DRQ | STAT_ERR, | |
983 | "write block", "data wait") & STAT_ERR) { | |
984 | pi_disconnect(pf_current->pi); | |
985 | if (pf_retries < PF_MAX_RETRIES) { | |
986 | pf_retries++; | |
987 | pi_do_claimed(pf_current->pi, do_pf_write_start); | |
988 | return; | |
989 | } | |
2a842aca | 990 | next_request(BLK_STS_IOERR); |
1da177e4 LT |
991 | return; |
992 | } | |
993 | pi_write_block(pf_current->pi, pf_buf, 512); | |
994 | if (pf_next_buf()) | |
995 | break; | |
996 | } | |
997 | pf_mask = 0; | |
998 | ps_set_intr(do_pf_write_done, pf_ready, PF_TMO, nice); | |
999 | } | |
1000 | ||
1001 | static void do_pf_write_done(void) | |
1002 | { | |
1003 | if (pf_wait(pf_current, STAT_BUSY, 0, "write block", "done") & STAT_ERR) { | |
1004 | pi_disconnect(pf_current->pi); | |
1005 | if (pf_retries < PF_MAX_RETRIES) { | |
1006 | pf_retries++; | |
1007 | pi_do_claimed(pf_current->pi, do_pf_write_start); | |
1008 | return; | |
1009 | } | |
2a842aca | 1010 | next_request(BLK_STS_IOERR); |
1da177e4 LT |
1011 | return; |
1012 | } | |
1013 | pi_disconnect(pf_current->pi); | |
f06d9a2b | 1014 | next_request(0); |
1da177e4 LT |
1015 | } |
1016 | ||
1017 | static int __init pf_init(void) | |
1018 | { /* preliminary initialisation */ | |
1019 | struct pf_unit *pf; | |
1020 | int unit; | |
1021 | ||
1022 | if (disable) | |
8bca98ca | 1023 | return -EINVAL; |
1da177e4 LT |
1024 | |
1025 | pf_init_units(); | |
1026 | ||
1027 | if (pf_detect()) | |
8bca98ca | 1028 | return -ENODEV; |
1da177e4 LT |
1029 | pf_busy = 0; |
1030 | ||
1031 | if (register_blkdev(major, name)) { | |
58ccd2d3 Y |
1032 | for (pf = units, unit = 0; unit < PF_UNITS; pf++, unit++) { |
1033 | if (!pf->disk) | |
1034 | continue; | |
1035 | blk_cleanup_queue(pf->disk->queue); | |
1036 | blk_mq_free_tag_set(&pf->tag_set); | |
1da177e4 | 1037 | put_disk(pf->disk); |
58ccd2d3 | 1038 | } |
8bca98ca | 1039 | return -EBUSY; |
1da177e4 | 1040 | } |
1da177e4 LT |
1041 | |
1042 | for (pf = units, unit = 0; unit < PF_UNITS; pf++, unit++) { | |
1043 | struct gendisk *disk = pf->disk; | |
1044 | ||
1045 | if (!pf->present) | |
1046 | continue; | |
1047 | disk->private_data = pf; | |
1da177e4 LT |
1048 | add_disk(disk); |
1049 | } | |
1050 | return 0; | |
1051 | } | |
1052 | ||
1053 | static void __exit pf_exit(void) | |
1054 | { | |
1055 | struct pf_unit *pf; | |
1056 | int unit; | |
1057 | unregister_blkdev(major, name); | |
1058 | for (pf = units, unit = 0; unit < PF_UNITS; pf++, unit++) { | |
58ccd2d3 Y |
1059 | if (!pf->disk) |
1060 | continue; | |
1061 | ||
6ce59025 JA |
1062 | if (pf->present) |
1063 | del_gendisk(pf->disk); | |
1064 | ||
3a644142 | 1065 | blk_cleanup_queue(pf->disk->queue); |
77218ddf | 1066 | blk_mq_free_tag_set(&pf->tag_set); |
1da177e4 | 1067 | put_disk(pf->disk); |
6ce59025 JA |
1068 | |
1069 | if (pf->present) | |
1070 | pi_release(pf->pi); | |
1da177e4 | 1071 | } |
1da177e4 LT |
1072 | } |
1073 | ||
1074 | MODULE_LICENSE("GPL"); | |
1075 | module_init(pf_init) | |
1076 | module_exit(pf_exit) |