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1da177e4 LT |
1 | /* imm.c -- low level driver for the IOMEGA MatchMaker |
2 | * parallel port SCSI host adapter. | |
3 | * | |
4 | * (The IMM is the embedded controller in the ZIP Plus drive.) | |
5 | * | |
25985edc | 6 | * My unofficial company acronym list is 21 pages long: |
1da177e4 LT |
7 | * FLA: Four letter acronym with built in facility for |
8 | * future expansion to five letters. | |
9 | */ | |
10 | ||
1da177e4 LT |
11 | #include <linux/init.h> |
12 | #include <linux/kernel.h> | |
13 | #include <linux/module.h> | |
14 | #include <linux/blkdev.h> | |
15 | #include <linux/parport.h> | |
16 | #include <linux/workqueue.h> | |
68b3aa7c | 17 | #include <linux/delay.h> |
5a0e3ad6 | 18 | #include <linux/slab.h> |
1da177e4 LT |
19 | #include <asm/io.h> |
20 | ||
21 | #include <scsi/scsi.h> | |
22 | #include <scsi/scsi_cmnd.h> | |
23 | #include <scsi/scsi_device.h> | |
24 | #include <scsi/scsi_host.h> | |
25 | ||
26 | /* The following #define is to avoid a clash with hosts.c */ | |
27 | #define IMM_PROBE_SPP 0x0001 | |
28 | #define IMM_PROBE_PS2 0x0002 | |
29 | #define IMM_PROBE_ECR 0x0010 | |
30 | #define IMM_PROBE_EPP17 0x0100 | |
31 | #define IMM_PROBE_EPP19 0x0200 | |
32 | ||
33 | ||
34 | typedef struct { | |
35 | struct pardevice *dev; /* Parport device entry */ | |
36 | int base; /* Actual port address */ | |
37 | int base_hi; /* Hi Base address for ECP-ISA chipset */ | |
38 | int mode; /* Transfer mode */ | |
39 | struct scsi_cmnd *cur_cmd; /* Current queued command */ | |
c4028958 | 40 | struct delayed_work imm_tq; /* Polling interrupt stuff */ |
1da177e4 LT |
41 | unsigned long jstart; /* Jiffies at start */ |
42 | unsigned failed:1; /* Failure flag */ | |
43 | unsigned dp:1; /* Data phase present */ | |
44 | unsigned rd:1; /* Read data in data phase */ | |
45 | unsigned wanted:1; /* Parport sharing busy flag */ | |
a290dd57 | 46 | unsigned int dev_no; /* Device number */ |
1da177e4 LT |
47 | wait_queue_head_t *waiting; |
48 | struct Scsi_Host *host; | |
49 | struct list_head list; | |
50 | } imm_struct; | |
51 | ||
52 | static void imm_reset_pulse(unsigned int base); | |
53 | static int device_check(imm_struct *dev); | |
54 | ||
55 | #include "imm.h" | |
56 | ||
57 | static inline imm_struct *imm_dev(struct Scsi_Host *host) | |
58 | { | |
59 | return *(imm_struct **)&host->hostdata; | |
60 | } | |
61 | ||
62 | static DEFINE_SPINLOCK(arbitration_lock); | |
63 | ||
64 | static void got_it(imm_struct *dev) | |
65 | { | |
66 | dev->base = dev->dev->port->base; | |
67 | if (dev->cur_cmd) | |
68 | dev->cur_cmd->SCp.phase = 1; | |
69 | else | |
70 | wake_up(dev->waiting); | |
71 | } | |
72 | ||
73 | static void imm_wakeup(void *ref) | |
74 | { | |
75 | imm_struct *dev = (imm_struct *) ref; | |
76 | unsigned long flags; | |
77 | ||
78 | spin_lock_irqsave(&arbitration_lock, flags); | |
79 | if (dev->wanted) { | |
9ffeca3e SM |
80 | if (parport_claim(dev->dev) == 0) { |
81 | got_it(dev); | |
82 | dev->wanted = 0; | |
83 | } | |
1da177e4 LT |
84 | } |
85 | spin_unlock_irqrestore(&arbitration_lock, flags); | |
86 | } | |
87 | ||
88 | static int imm_pb_claim(imm_struct *dev) | |
89 | { | |
90 | unsigned long flags; | |
91 | int res = 1; | |
92 | spin_lock_irqsave(&arbitration_lock, flags); | |
93 | if (parport_claim(dev->dev) == 0) { | |
94 | got_it(dev); | |
95 | res = 0; | |
96 | } | |
97 | dev->wanted = res; | |
98 | spin_unlock_irqrestore(&arbitration_lock, flags); | |
99 | return res; | |
100 | } | |
101 | ||
102 | static void imm_pb_dismiss(imm_struct *dev) | |
103 | { | |
104 | unsigned long flags; | |
105 | int wanted; | |
106 | spin_lock_irqsave(&arbitration_lock, flags); | |
107 | wanted = dev->wanted; | |
108 | dev->wanted = 0; | |
109 | spin_unlock_irqrestore(&arbitration_lock, flags); | |
110 | if (!wanted) | |
111 | parport_release(dev->dev); | |
112 | } | |
113 | ||
114 | static inline void imm_pb_release(imm_struct *dev) | |
115 | { | |
116 | parport_release(dev->dev); | |
117 | } | |
118 | ||
119 | /* This is to give the imm driver a way to modify the timings (and other | |
120 | * parameters) by writing to the /proc/scsi/imm/0 file. | |
121 | * Very simple method really... (Too simple, no error checking :( ) | |
122 | * Reason: Kernel hackers HATE having to unload and reload modules for | |
123 | * testing... | |
124 | * Also gives a method to use a script to obtain optimum timings (TODO) | |
125 | */ | |
fa5fd368 | 126 | static int imm_write_info(struct Scsi_Host *host, char *buffer, int length) |
1da177e4 | 127 | { |
fa5fd368 | 128 | imm_struct *dev = imm_dev(host); |
1da177e4 LT |
129 | |
130 | if ((length > 5) && (strncmp(buffer, "mode=", 5) == 0)) { | |
fa5fd368 | 131 | dev->mode = simple_strtoul(buffer + 5, NULL, 0); |
1da177e4 LT |
132 | return length; |
133 | } | |
134 | printk("imm /proc: invalid variable\n"); | |
fa5fd368 | 135 | return -EINVAL; |
1da177e4 LT |
136 | } |
137 | ||
fa5fd368 | 138 | static int imm_show_info(struct seq_file *m, struct Scsi_Host *host) |
1da177e4 LT |
139 | { |
140 | imm_struct *dev = imm_dev(host); | |
1da177e4 | 141 | |
fa5fd368 AV |
142 | seq_printf(m, "Version : %s\n", IMM_VERSION); |
143 | seq_printf(m, "Parport : %s\n", dev->dev->port->name); | |
144 | seq_printf(m, "Mode : %s\n", IMM_MODE_STRING[dev->mode]); | |
145 | return 0; | |
1da177e4 LT |
146 | } |
147 | ||
148 | #if IMM_DEBUG > 0 | |
149 | #define imm_fail(x,y) printk("imm: imm_fail(%i) from %s at line %d\n",\ | |
cadbd4a5 | 150 | y, __func__, __LINE__); imm_fail_func(x,y); |
1da177e4 LT |
151 | static inline void |
152 | imm_fail_func(imm_struct *dev, int error_code) | |
153 | #else | |
154 | static inline void | |
155 | imm_fail(imm_struct *dev, int error_code) | |
156 | #endif | |
157 | { | |
158 | /* If we fail a device then we trash status / message bytes */ | |
159 | if (dev->cur_cmd) { | |
160 | dev->cur_cmd->result = error_code << 16; | |
161 | dev->failed = 1; | |
162 | } | |
163 | } | |
164 | ||
165 | /* | |
166 | * Wait for the high bit to be set. | |
167 | * | |
168 | * In principle, this could be tied to an interrupt, but the adapter | |
169 | * doesn't appear to be designed to support interrupts. We spin on | |
170 | * the 0x80 ready bit. | |
171 | */ | |
172 | static unsigned char imm_wait(imm_struct *dev) | |
173 | { | |
174 | int k; | |
175 | unsigned short ppb = dev->base; | |
176 | unsigned char r; | |
177 | ||
178 | w_ctr(ppb, 0x0c); | |
179 | ||
180 | k = IMM_SPIN_TMO; | |
181 | do { | |
182 | r = r_str(ppb); | |
183 | k--; | |
184 | udelay(1); | |
185 | } | |
186 | while (!(r & 0x80) && (k)); | |
187 | ||
188 | /* | |
189 | * STR register (LPT base+1) to SCSI mapping: | |
190 | * | |
191 | * STR imm imm | |
192 | * =================================== | |
193 | * 0x80 S_REQ S_REQ | |
194 | * 0x40 !S_BSY (????) | |
195 | * 0x20 !S_CD !S_CD | |
196 | * 0x10 !S_IO !S_IO | |
197 | * 0x08 (????) !S_BSY | |
198 | * | |
199 | * imm imm meaning | |
200 | * ================================== | |
201 | * 0xf0 0xb8 Bit mask | |
202 | * 0xc0 0x88 ZIP wants more data | |
203 | * 0xd0 0x98 ZIP wants to send more data | |
204 | * 0xe0 0xa8 ZIP is expecting SCSI command data | |
205 | * 0xf0 0xb8 end of transfer, ZIP is sending status | |
206 | */ | |
207 | w_ctr(ppb, 0x04); | |
208 | if (k) | |
209 | return (r & 0xb8); | |
210 | ||
211 | /* Counter expired - Time out occurred */ | |
212 | imm_fail(dev, DID_TIME_OUT); | |
213 | printk("imm timeout in imm_wait\n"); | |
214 | return 0; /* command timed out */ | |
215 | } | |
216 | ||
217 | static int imm_negotiate(imm_struct * tmp) | |
218 | { | |
219 | /* | |
220 | * The following is supposedly the IEEE 1284-1994 negotiate | |
221 | * sequence. I have yet to obtain a copy of the above standard | |
222 | * so this is a bit of a guess... | |
223 | * | |
224 | * A fair chunk of this is based on the Linux parport implementation | |
225 | * of IEEE 1284. | |
226 | * | |
227 | * Return 0 if data available | |
228 | * 1 if no data available | |
229 | */ | |
230 | ||
231 | unsigned short base = tmp->base; | |
232 | unsigned char a, mode; | |
233 | ||
234 | switch (tmp->mode) { | |
235 | case IMM_NIBBLE: | |
236 | mode = 0x00; | |
237 | break; | |
238 | case IMM_PS2: | |
239 | mode = 0x01; | |
240 | break; | |
241 | default: | |
242 | return 0; | |
243 | } | |
244 | ||
245 | w_ctr(base, 0x04); | |
246 | udelay(5); | |
247 | w_dtr(base, mode); | |
248 | udelay(100); | |
249 | w_ctr(base, 0x06); | |
250 | udelay(5); | |
251 | a = (r_str(base) & 0x20) ? 0 : 1; | |
252 | udelay(5); | |
253 | w_ctr(base, 0x07); | |
254 | udelay(5); | |
255 | w_ctr(base, 0x06); | |
256 | ||
257 | if (a) { | |
258 | printk | |
259 | ("IMM: IEEE1284 negotiate indicates no data available.\n"); | |
260 | imm_fail(tmp, DID_ERROR); | |
261 | } | |
262 | return a; | |
263 | } | |
264 | ||
265 | /* | |
266 | * Clear EPP timeout bit. | |
267 | */ | |
268 | static inline void epp_reset(unsigned short ppb) | |
269 | { | |
270 | int i; | |
271 | ||
272 | i = r_str(ppb); | |
273 | w_str(ppb, i); | |
274 | w_str(ppb, i & 0xfe); | |
275 | } | |
276 | ||
277 | /* | |
278 | * Wait for empty ECP fifo (if we are in ECP fifo mode only) | |
279 | */ | |
280 | static inline void ecp_sync(imm_struct *dev) | |
281 | { | |
282 | int i, ppb_hi = dev->base_hi; | |
283 | ||
284 | if (ppb_hi == 0) | |
285 | return; | |
286 | ||
287 | if ((r_ecr(ppb_hi) & 0xe0) == 0x60) { /* mode 011 == ECP fifo mode */ | |
288 | for (i = 0; i < 100; i++) { | |
289 | if (r_ecr(ppb_hi) & 0x01) | |
290 | return; | |
291 | udelay(5); | |
292 | } | |
293 | printk("imm: ECP sync failed as data still present in FIFO.\n"); | |
294 | } | |
295 | } | |
296 | ||
297 | static int imm_byte_out(unsigned short base, const char *buffer, int len) | |
298 | { | |
299 | int i; | |
300 | ||
301 | w_ctr(base, 0x4); /* apparently a sane mode */ | |
302 | for (i = len >> 1; i; i--) { | |
303 | w_dtr(base, *buffer++); | |
304 | w_ctr(base, 0x5); /* Drop STROBE low */ | |
305 | w_dtr(base, *buffer++); | |
306 | w_ctr(base, 0x0); /* STROBE high + INIT low */ | |
307 | } | |
308 | w_ctr(base, 0x4); /* apparently a sane mode */ | |
309 | return 1; /* All went well - we hope! */ | |
310 | } | |
311 | ||
312 | static int imm_nibble_in(unsigned short base, char *buffer, int len) | |
313 | { | |
314 | unsigned char l; | |
315 | int i; | |
316 | ||
317 | /* | |
318 | * The following is based on documented timing signals | |
319 | */ | |
320 | w_ctr(base, 0x4); | |
321 | for (i = len; i; i--) { | |
322 | w_ctr(base, 0x6); | |
323 | l = (r_str(base) & 0xf0) >> 4; | |
324 | w_ctr(base, 0x5); | |
325 | *buffer++ = (r_str(base) & 0xf0) | l; | |
326 | w_ctr(base, 0x4); | |
327 | } | |
328 | return 1; /* All went well - we hope! */ | |
329 | } | |
330 | ||
331 | static int imm_byte_in(unsigned short base, char *buffer, int len) | |
332 | { | |
333 | int i; | |
334 | ||
335 | /* | |
336 | * The following is based on documented timing signals | |
337 | */ | |
338 | w_ctr(base, 0x4); | |
339 | for (i = len; i; i--) { | |
340 | w_ctr(base, 0x26); | |
341 | *buffer++ = r_dtr(base); | |
342 | w_ctr(base, 0x25); | |
343 | } | |
344 | return 1; /* All went well - we hope! */ | |
345 | } | |
346 | ||
347 | static int imm_out(imm_struct *dev, char *buffer, int len) | |
348 | { | |
349 | unsigned short ppb = dev->base; | |
350 | int r = imm_wait(dev); | |
351 | ||
352 | /* | |
353 | * Make sure that: | |
354 | * a) the SCSI bus is BUSY (device still listening) | |
355 | * b) the device is listening | |
356 | */ | |
357 | if ((r & 0x18) != 0x08) { | |
358 | imm_fail(dev, DID_ERROR); | |
359 | printk("IMM: returned SCSI status %2x\n", r); | |
360 | return 0; | |
361 | } | |
362 | switch (dev->mode) { | |
363 | case IMM_EPP_32: | |
364 | case IMM_EPP_16: | |
365 | case IMM_EPP_8: | |
366 | epp_reset(ppb); | |
367 | w_ctr(ppb, 0x4); | |
368 | #ifdef CONFIG_SCSI_IZIP_EPP16 | |
369 | if (!(((long) buffer | len) & 0x01)) | |
370 | outsw(ppb + 4, buffer, len >> 1); | |
371 | #else | |
372 | if (!(((long) buffer | len) & 0x03)) | |
373 | outsl(ppb + 4, buffer, len >> 2); | |
374 | #endif | |
375 | else | |
376 | outsb(ppb + 4, buffer, len); | |
377 | w_ctr(ppb, 0xc); | |
378 | r = !(r_str(ppb) & 0x01); | |
379 | w_ctr(ppb, 0xc); | |
380 | ecp_sync(dev); | |
381 | break; | |
382 | ||
383 | case IMM_NIBBLE: | |
384 | case IMM_PS2: | |
385 | /* 8 bit output, with a loop */ | |
386 | r = imm_byte_out(ppb, buffer, len); | |
387 | break; | |
388 | ||
389 | default: | |
390 | printk("IMM: bug in imm_out()\n"); | |
391 | r = 0; | |
392 | } | |
393 | return r; | |
394 | } | |
395 | ||
396 | static int imm_in(imm_struct *dev, char *buffer, int len) | |
397 | { | |
398 | unsigned short ppb = dev->base; | |
399 | int r = imm_wait(dev); | |
400 | ||
401 | /* | |
402 | * Make sure that: | |
403 | * a) the SCSI bus is BUSY (device still listening) | |
404 | * b) the device is sending data | |
405 | */ | |
406 | if ((r & 0x18) != 0x18) { | |
407 | imm_fail(dev, DID_ERROR); | |
408 | return 0; | |
409 | } | |
410 | switch (dev->mode) { | |
411 | case IMM_NIBBLE: | |
412 | /* 4 bit input, with a loop */ | |
413 | r = imm_nibble_in(ppb, buffer, len); | |
414 | w_ctr(ppb, 0xc); | |
415 | break; | |
416 | ||
417 | case IMM_PS2: | |
418 | /* 8 bit input, with a loop */ | |
419 | r = imm_byte_in(ppb, buffer, len); | |
420 | w_ctr(ppb, 0xc); | |
421 | break; | |
422 | ||
423 | case IMM_EPP_32: | |
424 | case IMM_EPP_16: | |
425 | case IMM_EPP_8: | |
426 | epp_reset(ppb); | |
427 | w_ctr(ppb, 0x24); | |
428 | #ifdef CONFIG_SCSI_IZIP_EPP16 | |
429 | if (!(((long) buffer | len) & 0x01)) | |
430 | insw(ppb + 4, buffer, len >> 1); | |
431 | #else | |
432 | if (!(((long) buffer | len) & 0x03)) | |
433 | insl(ppb + 4, buffer, len >> 2); | |
434 | #endif | |
435 | else | |
436 | insb(ppb + 4, buffer, len); | |
437 | w_ctr(ppb, 0x2c); | |
438 | r = !(r_str(ppb) & 0x01); | |
439 | w_ctr(ppb, 0x2c); | |
440 | ecp_sync(dev); | |
441 | break; | |
442 | ||
443 | default: | |
444 | printk("IMM: bug in imm_ins()\n"); | |
445 | r = 0; | |
446 | break; | |
447 | } | |
448 | return r; | |
449 | } | |
450 | ||
451 | static int imm_cpp(unsigned short ppb, unsigned char b) | |
452 | { | |
453 | /* | |
454 | * Comments on udelay values refer to the | |
455 | * Command Packet Protocol (CPP) timing diagram. | |
456 | */ | |
457 | ||
458 | unsigned char s1, s2, s3; | |
459 | w_ctr(ppb, 0x0c); | |
460 | udelay(2); /* 1 usec - infinite */ | |
461 | w_dtr(ppb, 0xaa); | |
462 | udelay(10); /* 7 usec - infinite */ | |
463 | w_dtr(ppb, 0x55); | |
464 | udelay(10); /* 7 usec - infinite */ | |
465 | w_dtr(ppb, 0x00); | |
466 | udelay(10); /* 7 usec - infinite */ | |
467 | w_dtr(ppb, 0xff); | |
468 | udelay(10); /* 7 usec - infinite */ | |
469 | s1 = r_str(ppb) & 0xb8; | |
470 | w_dtr(ppb, 0x87); | |
471 | udelay(10); /* 7 usec - infinite */ | |
472 | s2 = r_str(ppb) & 0xb8; | |
473 | w_dtr(ppb, 0x78); | |
474 | udelay(10); /* 7 usec - infinite */ | |
475 | s3 = r_str(ppb) & 0x38; | |
476 | /* | |
477 | * Values for b are: | |
478 | * 0000 00aa Assign address aa to current device | |
479 | * 0010 00aa Select device aa in EPP Winbond mode | |
480 | * 0010 10aa Select device aa in EPP mode | |
481 | * 0011 xxxx Deselect all devices | |
482 | * 0110 00aa Test device aa | |
483 | * 1101 00aa Select device aa in ECP mode | |
484 | * 1110 00aa Select device aa in Compatible mode | |
485 | */ | |
486 | w_dtr(ppb, b); | |
487 | udelay(2); /* 1 usec - infinite */ | |
488 | w_ctr(ppb, 0x0c); | |
489 | udelay(10); /* 7 usec - infinite */ | |
490 | w_ctr(ppb, 0x0d); | |
491 | udelay(2); /* 1 usec - infinite */ | |
492 | w_ctr(ppb, 0x0c); | |
493 | udelay(10); /* 7 usec - infinite */ | |
494 | w_dtr(ppb, 0xff); | |
495 | udelay(10); /* 7 usec - infinite */ | |
496 | ||
497 | /* | |
498 | * The following table is electrical pin values. | |
499 | * (BSY is inverted at the CTR register) | |
500 | * | |
501 | * BSY ACK POut SEL Fault | |
502 | * S1 0 X 1 1 1 | |
503 | * S2 1 X 0 1 1 | |
504 | * S3 L X 1 1 S | |
505 | * | |
506 | * L => Last device in chain | |
507 | * S => Selected | |
508 | * | |
509 | * Observered values for S1,S2,S3 are: | |
510 | * Disconnect => f8/58/78 | |
511 | * Connect => f8/58/70 | |
512 | */ | |
513 | if ((s1 == 0xb8) && (s2 == 0x18) && (s3 == 0x30)) | |
514 | return 1; /* Connected */ | |
515 | if ((s1 == 0xb8) && (s2 == 0x18) && (s3 == 0x38)) | |
516 | return 0; /* Disconnected */ | |
517 | ||
518 | return -1; /* No device present */ | |
519 | } | |
520 | ||
521 | static inline int imm_connect(imm_struct *dev, int flag) | |
522 | { | |
523 | unsigned short ppb = dev->base; | |
524 | ||
525 | imm_cpp(ppb, 0xe0); /* Select device 0 in compatible mode */ | |
526 | imm_cpp(ppb, 0x30); /* Disconnect all devices */ | |
527 | ||
528 | if ((dev->mode == IMM_EPP_8) || | |
529 | (dev->mode == IMM_EPP_16) || | |
530 | (dev->mode == IMM_EPP_32)) | |
531 | return imm_cpp(ppb, 0x28); /* Select device 0 in EPP mode */ | |
532 | return imm_cpp(ppb, 0xe0); /* Select device 0 in compatible mode */ | |
533 | } | |
534 | ||
535 | static void imm_disconnect(imm_struct *dev) | |
536 | { | |
537 | imm_cpp(dev->base, 0x30); /* Disconnect all devices */ | |
538 | } | |
539 | ||
540 | static int imm_select(imm_struct *dev, int target) | |
541 | { | |
542 | int k; | |
543 | unsigned short ppb = dev->base; | |
544 | ||
545 | /* | |
546 | * Firstly we want to make sure there is nothing | |
547 | * holding onto the SCSI bus. | |
548 | */ | |
549 | w_ctr(ppb, 0xc); | |
550 | ||
551 | k = IMM_SELECT_TMO; | |
552 | do { | |
553 | k--; | |
554 | } while ((r_str(ppb) & 0x08) && (k)); | |
555 | ||
556 | if (!k) | |
557 | return 0; | |
558 | ||
559 | /* | |
560 | * Now assert the SCSI ID (HOST and TARGET) on the data bus | |
561 | */ | |
562 | w_ctr(ppb, 0x4); | |
563 | w_dtr(ppb, 0x80 | (1 << target)); | |
564 | udelay(1); | |
565 | ||
566 | /* | |
567 | * Deassert SELIN first followed by STROBE | |
568 | */ | |
569 | w_ctr(ppb, 0xc); | |
570 | w_ctr(ppb, 0xd); | |
571 | ||
572 | /* | |
573 | * ACK should drop low while SELIN is deasserted. | |
574 | * FAULT should drop low when the SCSI device latches the bus. | |
575 | */ | |
576 | k = IMM_SELECT_TMO; | |
577 | do { | |
578 | k--; | |
579 | } | |
580 | while (!(r_str(ppb) & 0x08) && (k)); | |
581 | ||
582 | /* | |
583 | * Place the interface back into a sane state (status mode) | |
584 | */ | |
585 | w_ctr(ppb, 0xc); | |
586 | return (k) ? 1 : 0; | |
587 | } | |
588 | ||
589 | static int imm_init(imm_struct *dev) | |
590 | { | |
591 | if (imm_connect(dev, 0) != 1) | |
592 | return -EIO; | |
593 | imm_reset_pulse(dev->base); | |
68b3aa7c | 594 | mdelay(1); /* Delay to allow devices to settle */ |
1da177e4 | 595 | imm_disconnect(dev); |
68b3aa7c | 596 | mdelay(1); /* Another delay to allow devices to settle */ |
1da177e4 LT |
597 | return device_check(dev); |
598 | } | |
599 | ||
600 | static inline int imm_send_command(struct scsi_cmnd *cmd) | |
601 | { | |
602 | imm_struct *dev = imm_dev(cmd->device->host); | |
603 | int k; | |
604 | ||
605 | /* NOTE: IMM uses byte pairs */ | |
606 | for (k = 0; k < cmd->cmd_len; k += 2) | |
607 | if (!imm_out(dev, &cmd->cmnd[k], 2)) | |
608 | return 0; | |
609 | return 1; | |
610 | } | |
611 | ||
612 | /* | |
613 | * The bulk flag enables some optimisations in the data transfer loops, | |
614 | * it should be true for any command that transfers data in integral | |
615 | * numbers of sectors. | |
616 | * | |
617 | * The driver appears to remain stable if we speed up the parallel port | |
618 | * i/o in this function, but not elsewhere. | |
619 | */ | |
620 | static int imm_completion(struct scsi_cmnd *cmd) | |
621 | { | |
622 | /* Return codes: | |
623 | * -1 Error | |
624 | * 0 Told to schedule | |
625 | * 1 Finished data transfer | |
626 | */ | |
627 | imm_struct *dev = imm_dev(cmd->device->host); | |
628 | unsigned short ppb = dev->base; | |
629 | unsigned long start_jiffies = jiffies; | |
630 | ||
631 | unsigned char r, v; | |
632 | int fast, bulk, status; | |
633 | ||
634 | v = cmd->cmnd[0]; | |
635 | bulk = ((v == READ_6) || | |
636 | (v == READ_10) || (v == WRITE_6) || (v == WRITE_10)); | |
637 | ||
638 | /* | |
639 | * We only get here if the drive is ready to comunicate, | |
640 | * hence no need for a full imm_wait. | |
641 | */ | |
642 | w_ctr(ppb, 0x0c); | |
643 | r = (r_str(ppb) & 0xb8); | |
644 | ||
645 | /* | |
646 | * while (device is not ready to send status byte) | |
647 | * loop; | |
648 | */ | |
649 | while (r != (unsigned char) 0xb8) { | |
650 | /* | |
651 | * If we have been running for more than a full timer tick | |
652 | * then take a rest. | |
653 | */ | |
654 | if (time_after(jiffies, start_jiffies + 1)) | |
655 | return 0; | |
656 | ||
657 | /* | |
658 | * FAIL if: | |
659 | * a) Drive status is screwy (!ready && !present) | |
660 | * b) Drive is requesting/sending more data than expected | |
661 | */ | |
662 | if (((r & 0x88) != 0x88) || (cmd->SCp.this_residual <= 0)) { | |
663 | imm_fail(dev, DID_ERROR); | |
664 | return -1; /* ERROR_RETURN */ | |
665 | } | |
666 | /* determine if we should use burst I/O */ | |
667 | if (dev->rd == 0) { | |
668 | fast = (bulk | |
669 | && (cmd->SCp.this_residual >= | |
670 | IMM_BURST_SIZE)) ? IMM_BURST_SIZE : 2; | |
671 | status = imm_out(dev, cmd->SCp.ptr, fast); | |
672 | } else { | |
673 | fast = (bulk | |
674 | && (cmd->SCp.this_residual >= | |
675 | IMM_BURST_SIZE)) ? IMM_BURST_SIZE : 1; | |
676 | status = imm_in(dev, cmd->SCp.ptr, fast); | |
677 | } | |
678 | ||
679 | cmd->SCp.ptr += fast; | |
680 | cmd->SCp.this_residual -= fast; | |
681 | ||
682 | if (!status) { | |
683 | imm_fail(dev, DID_BUS_BUSY); | |
684 | return -1; /* ERROR_RETURN */ | |
685 | } | |
686 | if (cmd->SCp.buffer && !cmd->SCp.this_residual) { | |
687 | /* if scatter/gather, advance to the next segment */ | |
688 | if (cmd->SCp.buffers_residual--) { | |
689 | cmd->SCp.buffer++; | |
690 | cmd->SCp.this_residual = | |
691 | cmd->SCp.buffer->length; | |
45711f1a | 692 | cmd->SCp.ptr = sg_virt(cmd->SCp.buffer); |
1da177e4 LT |
693 | |
694 | /* | |
695 | * Make sure that we transfer even number of bytes | |
696 | * otherwise it makes imm_byte_out() messy. | |
697 | */ | |
698 | if (cmd->SCp.this_residual & 0x01) | |
699 | cmd->SCp.this_residual++; | |
700 | } | |
701 | } | |
702 | /* Now check to see if the drive is ready to comunicate */ | |
703 | w_ctr(ppb, 0x0c); | |
704 | r = (r_str(ppb) & 0xb8); | |
705 | ||
706 | /* If not, drop back down to the scheduler and wait a timer tick */ | |
707 | if (!(r & 0x80)) | |
708 | return 0; | |
709 | } | |
710 | return 1; /* FINISH_RETURN */ | |
711 | } | |
712 | ||
713 | /* | |
714 | * Since the IMM itself doesn't generate interrupts, we use | |
715 | * the scheduler's task queue to generate a stream of call-backs and | |
716 | * complete the request when the drive is ready. | |
717 | */ | |
c4028958 | 718 | static void imm_interrupt(struct work_struct *work) |
1da177e4 | 719 | { |
c4028958 | 720 | imm_struct *dev = container_of(work, imm_struct, imm_tq.work); |
1da177e4 LT |
721 | struct scsi_cmnd *cmd = dev->cur_cmd; |
722 | struct Scsi_Host *host = cmd->device->host; | |
723 | unsigned long flags; | |
724 | ||
1da177e4 | 725 | if (imm_engine(dev, cmd)) { |
1da177e4 LT |
726 | schedule_delayed_work(&dev->imm_tq, 1); |
727 | return; | |
728 | } | |
729 | /* Command must of completed hence it is safe to let go... */ | |
730 | #if IMM_DEBUG > 0 | |
731 | switch ((cmd->result >> 16) & 0xff) { | |
732 | case DID_OK: | |
733 | break; | |
734 | case DID_NO_CONNECT: | |
735 | printk("imm: no device at SCSI ID %i\n", cmd->device->id); | |
736 | break; | |
737 | case DID_BUS_BUSY: | |
738 | printk("imm: BUS BUSY - EPP timeout detected\n"); | |
739 | break; | |
740 | case DID_TIME_OUT: | |
741 | printk("imm: unknown timeout\n"); | |
742 | break; | |
743 | case DID_ABORT: | |
744 | printk("imm: told to abort\n"); | |
745 | break; | |
746 | case DID_PARITY: | |
747 | printk("imm: parity error (???)\n"); | |
748 | break; | |
749 | case DID_ERROR: | |
750 | printk("imm: internal driver error\n"); | |
751 | break; | |
752 | case DID_RESET: | |
753 | printk("imm: told to reset device\n"); | |
754 | break; | |
755 | case DID_BAD_INTR: | |
756 | printk("imm: bad interrupt (???)\n"); | |
757 | break; | |
758 | default: | |
759 | printk("imm: bad return code (%02x)\n", | |
760 | (cmd->result >> 16) & 0xff); | |
761 | } | |
762 | #endif | |
763 | ||
764 | if (cmd->SCp.phase > 1) | |
765 | imm_disconnect(dev); | |
766 | ||
767 | imm_pb_dismiss(dev); | |
768 | ||
769 | spin_lock_irqsave(host->host_lock, flags); | |
770 | dev->cur_cmd = NULL; | |
771 | cmd->scsi_done(cmd); | |
772 | spin_unlock_irqrestore(host->host_lock, flags); | |
773 | return; | |
774 | } | |
775 | ||
776 | static int imm_engine(imm_struct *dev, struct scsi_cmnd *cmd) | |
777 | { | |
778 | unsigned short ppb = dev->base; | |
779 | unsigned char l = 0, h = 0; | |
780 | int retv, x; | |
781 | ||
782 | /* First check for any errors that may have occurred | |
783 | * Here we check for internal errors | |
784 | */ | |
785 | if (dev->failed) | |
786 | return 0; | |
787 | ||
788 | switch (cmd->SCp.phase) { | |
789 | case 0: /* Phase 0 - Waiting for parport */ | |
790 | if (time_after(jiffies, dev->jstart + HZ)) { | |
791 | /* | |
792 | * We waited more than a second | |
793 | * for parport to call us | |
794 | */ | |
795 | imm_fail(dev, DID_BUS_BUSY); | |
796 | return 0; | |
797 | } | |
798 | return 1; /* wait until imm_wakeup claims parport */ | |
799 | /* Phase 1 - Connected */ | |
800 | case 1: | |
801 | imm_connect(dev, CONNECT_EPP_MAYBE); | |
802 | cmd->SCp.phase++; | |
803 | ||
804 | /* Phase 2 - We are now talking to the scsi bus */ | |
805 | case 2: | |
422c0d61 | 806 | if (!imm_select(dev, scmd_id(cmd))) { |
1da177e4 LT |
807 | imm_fail(dev, DID_NO_CONNECT); |
808 | return 0; | |
809 | } | |
810 | cmd->SCp.phase++; | |
811 | ||
812 | /* Phase 3 - Ready to accept a command */ | |
813 | case 3: | |
814 | w_ctr(ppb, 0x0c); | |
815 | if (!(r_str(ppb) & 0x80)) | |
816 | return 1; | |
817 | ||
818 | if (!imm_send_command(cmd)) | |
819 | return 0; | |
820 | cmd->SCp.phase++; | |
821 | ||
822 | /* Phase 4 - Setup scatter/gather buffers */ | |
823 | case 4: | |
3ce7c658 BH |
824 | if (scsi_bufflen(cmd)) { |
825 | cmd->SCp.buffer = scsi_sglist(cmd); | |
1da177e4 | 826 | cmd->SCp.this_residual = cmd->SCp.buffer->length; |
45711f1a | 827 | cmd->SCp.ptr = sg_virt(cmd->SCp.buffer); |
1da177e4 | 828 | } else { |
1da177e4 | 829 | cmd->SCp.buffer = NULL; |
3ce7c658 BH |
830 | cmd->SCp.this_residual = 0; |
831 | cmd->SCp.ptr = NULL; | |
1da177e4 | 832 | } |
3ce7c658 | 833 | cmd->SCp.buffers_residual = scsi_sg_count(cmd) - 1; |
1da177e4 LT |
834 | cmd->SCp.phase++; |
835 | if (cmd->SCp.this_residual & 0x01) | |
836 | cmd->SCp.this_residual++; | |
837 | /* Phase 5 - Pre-Data transfer stage */ | |
838 | case 5: | |
839 | /* Spin lock for BUSY */ | |
840 | w_ctr(ppb, 0x0c); | |
841 | if (!(r_str(ppb) & 0x80)) | |
842 | return 1; | |
843 | ||
844 | /* Require negotiation for read requests */ | |
845 | x = (r_str(ppb) & 0xb8); | |
846 | dev->rd = (x & 0x10) ? 1 : 0; | |
847 | dev->dp = (x & 0x20) ? 0 : 1; | |
848 | ||
849 | if ((dev->dp) && (dev->rd)) | |
850 | if (imm_negotiate(dev)) | |
851 | return 0; | |
852 | cmd->SCp.phase++; | |
853 | ||
854 | /* Phase 6 - Data transfer stage */ | |
855 | case 6: | |
856 | /* Spin lock for BUSY */ | |
857 | w_ctr(ppb, 0x0c); | |
858 | if (!(r_str(ppb) & 0x80)) | |
859 | return 1; | |
860 | ||
861 | if (dev->dp) { | |
862 | retv = imm_completion(cmd); | |
863 | if (retv == -1) | |
864 | return 0; | |
865 | if (retv == 0) | |
866 | return 1; | |
867 | } | |
868 | cmd->SCp.phase++; | |
869 | ||
870 | /* Phase 7 - Post data transfer stage */ | |
871 | case 7: | |
872 | if ((dev->dp) && (dev->rd)) { | |
873 | if ((dev->mode == IMM_NIBBLE) || (dev->mode == IMM_PS2)) { | |
874 | w_ctr(ppb, 0x4); | |
875 | w_ctr(ppb, 0xc); | |
876 | w_ctr(ppb, 0xe); | |
877 | w_ctr(ppb, 0x4); | |
878 | } | |
879 | } | |
880 | cmd->SCp.phase++; | |
881 | ||
882 | /* Phase 8 - Read status/message */ | |
883 | case 8: | |
884 | /* Check for data overrun */ | |
885 | if (imm_wait(dev) != (unsigned char) 0xb8) { | |
886 | imm_fail(dev, DID_ERROR); | |
887 | return 0; | |
888 | } | |
889 | if (imm_negotiate(dev)) | |
890 | return 0; | |
891 | if (imm_in(dev, &l, 1)) { /* read status byte */ | |
892 | /* Check for optional message byte */ | |
893 | if (imm_wait(dev) == (unsigned char) 0xb8) | |
894 | imm_in(dev, &h, 1); | |
6bec4c38 | 895 | cmd->result = (DID_OK << 16) | (l & STATUS_MASK); |
1da177e4 LT |
896 | } |
897 | if ((dev->mode == IMM_NIBBLE) || (dev->mode == IMM_PS2)) { | |
898 | w_ctr(ppb, 0x4); | |
899 | w_ctr(ppb, 0xc); | |
900 | w_ctr(ppb, 0xe); | |
901 | w_ctr(ppb, 0x4); | |
902 | } | |
903 | return 0; /* Finished */ | |
904 | break; | |
905 | ||
906 | default: | |
907 | printk("imm: Invalid scsi phase\n"); | |
908 | } | |
909 | return 0; | |
910 | } | |
911 | ||
f281233d | 912 | static int imm_queuecommand_lck(struct scsi_cmnd *cmd, |
1da177e4 LT |
913 | void (*done)(struct scsi_cmnd *)) |
914 | { | |
915 | imm_struct *dev = imm_dev(cmd->device->host); | |
916 | ||
917 | if (dev->cur_cmd) { | |
918 | printk("IMM: bug in imm_queuecommand\n"); | |
919 | return 0; | |
920 | } | |
921 | dev->failed = 0; | |
922 | dev->jstart = jiffies; | |
923 | dev->cur_cmd = cmd; | |
924 | cmd->scsi_done = done; | |
925 | cmd->result = DID_ERROR << 16; /* default return code */ | |
926 | cmd->SCp.phase = 0; /* bus free */ | |
927 | ||
c4028958 | 928 | schedule_delayed_work(&dev->imm_tq, 0); |
1da177e4 LT |
929 | |
930 | imm_pb_claim(dev); | |
931 | ||
932 | return 0; | |
933 | } | |
934 | ||
f281233d JG |
935 | static DEF_SCSI_QCMD(imm_queuecommand) |
936 | ||
1da177e4 LT |
937 | /* |
938 | * Apparently the disk->capacity attribute is off by 1 sector | |
939 | * for all disk drives. We add the one here, but it should really | |
940 | * be done in sd.c. Even if it gets fixed there, this will still | |
941 | * work. | |
942 | */ | |
943 | static int imm_biosparam(struct scsi_device *sdev, struct block_device *dev, | |
944 | sector_t capacity, int ip[]) | |
945 | { | |
946 | ip[0] = 0x40; | |
947 | ip[1] = 0x20; | |
948 | ip[2] = ((unsigned long) capacity + 1) / (ip[0] * ip[1]); | |
949 | if (ip[2] > 1024) { | |
950 | ip[0] = 0xff; | |
951 | ip[1] = 0x3f; | |
952 | ip[2] = ((unsigned long) capacity + 1) / (ip[0] * ip[1]); | |
953 | } | |
954 | return 0; | |
955 | } | |
956 | ||
957 | static int imm_abort(struct scsi_cmnd *cmd) | |
958 | { | |
959 | imm_struct *dev = imm_dev(cmd->device->host); | |
960 | /* | |
961 | * There is no method for aborting commands since Iomega | |
962 | * have tied the SCSI_MESSAGE line high in the interface | |
963 | */ | |
964 | ||
965 | switch (cmd->SCp.phase) { | |
966 | case 0: /* Do not have access to parport */ | |
967 | case 1: /* Have not connected to interface */ | |
968 | dev->cur_cmd = NULL; /* Forget the problem */ | |
969 | return SUCCESS; | |
970 | break; | |
971 | default: /* SCSI command sent, can not abort */ | |
972 | return FAILED; | |
973 | break; | |
974 | } | |
975 | } | |
976 | ||
977 | static void imm_reset_pulse(unsigned int base) | |
978 | { | |
979 | w_ctr(base, 0x04); | |
980 | w_dtr(base, 0x40); | |
981 | udelay(1); | |
982 | w_ctr(base, 0x0c); | |
983 | w_ctr(base, 0x0d); | |
984 | udelay(50); | |
985 | w_ctr(base, 0x0c); | |
986 | w_ctr(base, 0x04); | |
987 | } | |
988 | ||
989 | static int imm_reset(struct scsi_cmnd *cmd) | |
990 | { | |
991 | imm_struct *dev = imm_dev(cmd->device->host); | |
992 | ||
993 | if (cmd->SCp.phase) | |
994 | imm_disconnect(dev); | |
995 | dev->cur_cmd = NULL; /* Forget the problem */ | |
996 | ||
997 | imm_connect(dev, CONNECT_NORMAL); | |
998 | imm_reset_pulse(dev->base); | |
68b3aa7c | 999 | mdelay(1); /* device settle delay */ |
1da177e4 | 1000 | imm_disconnect(dev); |
68b3aa7c | 1001 | mdelay(1); /* device settle delay */ |
1da177e4 LT |
1002 | return SUCCESS; |
1003 | } | |
1004 | ||
1005 | static int device_check(imm_struct *dev) | |
1006 | { | |
1007 | /* This routine looks for a device and then attempts to use EPP | |
1008 | to send a command. If all goes as planned then EPP is available. */ | |
1009 | ||
1010 | static char cmd[6] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }; | |
1011 | int loop, old_mode, status, k, ppb = dev->base; | |
1012 | unsigned char l; | |
1013 | ||
1014 | old_mode = dev->mode; | |
1015 | for (loop = 0; loop < 8; loop++) { | |
1016 | /* Attempt to use EPP for Test Unit Ready */ | |
1017 | if ((ppb & 0x0007) == 0x0000) | |
1018 | dev->mode = IMM_EPP_32; | |
1019 | ||
1020 | second_pass: | |
1021 | imm_connect(dev, CONNECT_EPP_MAYBE); | |
1022 | /* Select SCSI device */ | |
1023 | if (!imm_select(dev, loop)) { | |
1024 | imm_disconnect(dev); | |
1025 | continue; | |
1026 | } | |
1027 | printk("imm: Found device at ID %i, Attempting to use %s\n", | |
1028 | loop, IMM_MODE_STRING[dev->mode]); | |
1029 | ||
1030 | /* Send SCSI command */ | |
1031 | status = 1; | |
1032 | w_ctr(ppb, 0x0c); | |
1033 | for (l = 0; (l < 3) && (status); l++) | |
1034 | status = imm_out(dev, &cmd[l << 1], 2); | |
1035 | ||
1036 | if (!status) { | |
1037 | imm_disconnect(dev); | |
1038 | imm_connect(dev, CONNECT_EPP_MAYBE); | |
1039 | imm_reset_pulse(dev->base); | |
1040 | udelay(1000); | |
1041 | imm_disconnect(dev); | |
1042 | udelay(1000); | |
1043 | if (dev->mode == IMM_EPP_32) { | |
1044 | dev->mode = old_mode; | |
1045 | goto second_pass; | |
1046 | } | |
1047 | printk("imm: Unable to establish communication\n"); | |
1048 | return -EIO; | |
1049 | } | |
1050 | w_ctr(ppb, 0x0c); | |
1051 | ||
1052 | k = 1000000; /* 1 Second */ | |
1053 | do { | |
1054 | l = r_str(ppb); | |
1055 | k--; | |
1056 | udelay(1); | |
1057 | } while (!(l & 0x80) && (k)); | |
1058 | ||
1059 | l &= 0xb8; | |
1060 | ||
1061 | if (l != 0xb8) { | |
1062 | imm_disconnect(dev); | |
1063 | imm_connect(dev, CONNECT_EPP_MAYBE); | |
1064 | imm_reset_pulse(dev->base); | |
1065 | udelay(1000); | |
1066 | imm_disconnect(dev); | |
1067 | udelay(1000); | |
1068 | if (dev->mode == IMM_EPP_32) { | |
1069 | dev->mode = old_mode; | |
1070 | goto second_pass; | |
1071 | } | |
1072 | printk | |
1073 | ("imm: Unable to establish communication\n"); | |
1074 | return -EIO; | |
1075 | } | |
1076 | imm_disconnect(dev); | |
1077 | printk | |
1078 | ("imm: Communication established at 0x%x with ID %i using %s\n", | |
1079 | ppb, loop, IMM_MODE_STRING[dev->mode]); | |
1080 | imm_connect(dev, CONNECT_EPP_MAYBE); | |
1081 | imm_reset_pulse(dev->base); | |
1082 | udelay(1000); | |
1083 | imm_disconnect(dev); | |
1084 | udelay(1000); | |
1085 | return 0; | |
1086 | } | |
1087 | printk("imm: No devices found\n"); | |
1088 | return -ENODEV; | |
1089 | } | |
1090 | ||
979dca38 RD |
1091 | /* |
1092 | * imm cannot deal with highmem, so this causes all IO pages for this host | |
1093 | * to reside in low memory (hence mapped) | |
1094 | */ | |
1da177e4 LT |
1095 | static int imm_adjust_queue(struct scsi_device *device) |
1096 | { | |
1097 | blk_queue_bounce_limit(device->request_queue, BLK_BOUNCE_HIGH); | |
1098 | return 0; | |
1099 | } | |
1100 | ||
1101 | static struct scsi_host_template imm_template = { | |
1102 | .module = THIS_MODULE, | |
1103 | .proc_name = "imm", | |
fa5fd368 AV |
1104 | .show_info = imm_show_info, |
1105 | .write_info = imm_write_info, | |
1da177e4 LT |
1106 | .name = "Iomega VPI2 (imm) interface", |
1107 | .queuecommand = imm_queuecommand, | |
1108 | .eh_abort_handler = imm_abort, | |
1da177e4 LT |
1109 | .eh_host_reset_handler = imm_reset, |
1110 | .bios_param = imm_biosparam, | |
1111 | .this_id = 7, | |
1112 | .sg_tablesize = SG_ALL, | |
1da177e4 LT |
1113 | .use_clustering = ENABLE_CLUSTERING, |
1114 | .can_queue = 1, | |
1115 | .slave_alloc = imm_adjust_queue, | |
1da177e4 LT |
1116 | }; |
1117 | ||
1118 | /*************************************************************************** | |
1119 | * Parallel port probing routines * | |
1120 | ***************************************************************************/ | |
1121 | ||
1122 | static LIST_HEAD(imm_hosts); | |
1123 | ||
a290dd57 SM |
1124 | /* |
1125 | * Finds the first available device number that can be alloted to the | |
1126 | * new imm device and returns the address of the previous node so that | |
1127 | * we can add to the tail and have a list in the ascending order. | |
1128 | */ | |
1129 | ||
1130 | static inline imm_struct *find_parent(void) | |
1131 | { | |
1132 | imm_struct *dev, *par = NULL; | |
1133 | unsigned int cnt = 0; | |
1134 | ||
1135 | if (list_empty(&imm_hosts)) | |
1136 | return NULL; | |
1137 | ||
1138 | list_for_each_entry(dev, &imm_hosts, list) { | |
1139 | if (dev->dev_no != cnt) | |
1140 | return par; | |
1141 | cnt++; | |
1142 | par = dev; | |
1143 | } | |
1144 | ||
1145 | return par; | |
1146 | } | |
1147 | ||
1da177e4 LT |
1148 | static int __imm_attach(struct parport *pb) |
1149 | { | |
1150 | struct Scsi_Host *host; | |
a290dd57 | 1151 | imm_struct *dev, *temp; |
7259f0d0 | 1152 | DECLARE_WAIT_QUEUE_HEAD_ONSTACK(waiting); |
1da177e4 LT |
1153 | DEFINE_WAIT(wait); |
1154 | int ports; | |
1155 | int modes, ppb; | |
1156 | int err = -ENOMEM; | |
a290dd57 | 1157 | struct pardev_cb imm_cb; |
1da177e4 LT |
1158 | |
1159 | init_waitqueue_head(&waiting); | |
1160 | ||
dd00cc48 | 1161 | dev = kzalloc(sizeof(imm_struct), GFP_KERNEL); |
1da177e4 LT |
1162 | if (!dev) |
1163 | return -ENOMEM; | |
1164 | ||
1da177e4 LT |
1165 | |
1166 | dev->base = -1; | |
1167 | dev->mode = IMM_AUTODETECT; | |
1168 | INIT_LIST_HEAD(&dev->list); | |
1169 | ||
a290dd57 SM |
1170 | temp = find_parent(); |
1171 | if (temp) | |
1172 | dev->dev_no = temp->dev_no + 1; | |
1173 | ||
1174 | memset(&imm_cb, 0, sizeof(imm_cb)); | |
1175 | imm_cb.private = dev; | |
1176 | imm_cb.wakeup = imm_wakeup; | |
1da177e4 | 1177 | |
a290dd57 | 1178 | dev->dev = parport_register_dev_model(pb, "imm", &imm_cb, dev->dev_no); |
1da177e4 LT |
1179 | if (!dev->dev) |
1180 | goto out; | |
1181 | ||
1182 | ||
1183 | /* Claim the bus so it remembers what we do to the control | |
1184 | * registers. [ CTR and ECP ] | |
1185 | */ | |
1186 | err = -EBUSY; | |
1187 | dev->waiting = &waiting; | |
1188 | prepare_to_wait(&waiting, &wait, TASK_UNINTERRUPTIBLE); | |
1189 | if (imm_pb_claim(dev)) | |
1190 | schedule_timeout(3 * HZ); | |
1191 | if (dev->wanted) { | |
1192 | printk(KERN_ERR "imm%d: failed to claim parport because " | |
1193 | "a pardevice is owning the port for too long " | |
1194 | "time!\n", pb->number); | |
1195 | imm_pb_dismiss(dev); | |
1196 | dev->waiting = NULL; | |
1197 | finish_wait(&waiting, &wait); | |
1198 | goto out1; | |
1199 | } | |
1200 | dev->waiting = NULL; | |
1201 | finish_wait(&waiting, &wait); | |
1202 | ppb = dev->base = dev->dev->port->base; | |
1203 | dev->base_hi = dev->dev->port->base_hi; | |
1204 | w_ctr(ppb, 0x0c); | |
1205 | modes = dev->dev->port->modes; | |
1206 | ||
1207 | /* Mode detection works up the chain of speed | |
1208 | * This avoids a nasty if-then-else-if-... tree | |
1209 | */ | |
1210 | dev->mode = IMM_NIBBLE; | |
1211 | ||
1212 | if (modes & PARPORT_MODE_TRISTATE) | |
1213 | dev->mode = IMM_PS2; | |
1214 | ||
1215 | /* Done configuration */ | |
1216 | ||
1217 | err = imm_init(dev); | |
1218 | ||
1219 | imm_pb_release(dev); | |
1220 | ||
1221 | if (err) | |
1222 | goto out1; | |
1223 | ||
1224 | /* now the glue ... */ | |
1225 | if (dev->mode == IMM_NIBBLE || dev->mode == IMM_PS2) | |
1226 | ports = 3; | |
1227 | else | |
1228 | ports = 8; | |
1229 | ||
c4028958 | 1230 | INIT_DELAYED_WORK(&dev->imm_tq, imm_interrupt); |
1da177e4 LT |
1231 | |
1232 | err = -ENOMEM; | |
1233 | host = scsi_host_alloc(&imm_template, sizeof(imm_struct *)); | |
1234 | if (!host) | |
1235 | goto out1; | |
1236 | host->io_port = pb->base; | |
1237 | host->n_io_port = ports; | |
1238 | host->dma_channel = -1; | |
1239 | host->unique_id = pb->number; | |
1240 | *(imm_struct **)&host->hostdata = dev; | |
1241 | dev->host = host; | |
a290dd57 SM |
1242 | if (!temp) |
1243 | list_add_tail(&dev->list, &imm_hosts); | |
1244 | else | |
1245 | list_add_tail(&dev->list, &temp->list); | |
1da177e4 LT |
1246 | err = scsi_add_host(host, NULL); |
1247 | if (err) | |
1248 | goto out2; | |
1249 | scsi_scan_host(host); | |
1250 | return 0; | |
1251 | ||
1252 | out2: | |
1253 | list_del_init(&dev->list); | |
1254 | scsi_host_put(host); | |
1255 | out1: | |
1256 | parport_unregister_device(dev->dev); | |
1257 | out: | |
1258 | kfree(dev); | |
1259 | return err; | |
1260 | } | |
1261 | ||
1262 | static void imm_attach(struct parport *pb) | |
1263 | { | |
1264 | __imm_attach(pb); | |
1265 | } | |
1266 | ||
1267 | static void imm_detach(struct parport *pb) | |
1268 | { | |
1269 | imm_struct *dev; | |
1270 | list_for_each_entry(dev, &imm_hosts, list) { | |
1271 | if (dev->dev->port == pb) { | |
1272 | list_del_init(&dev->list); | |
1273 | scsi_remove_host(dev->host); | |
1274 | scsi_host_put(dev->host); | |
1275 | parport_unregister_device(dev->dev); | |
1276 | kfree(dev); | |
1277 | break; | |
1278 | } | |
1279 | } | |
1280 | } | |
1281 | ||
1282 | static struct parport_driver imm_driver = { | |
a290dd57 SM |
1283 | .name = "imm", |
1284 | .match_port = imm_attach, | |
1285 | .detach = imm_detach, | |
1286 | .devmodel = true, | |
1da177e4 LT |
1287 | }; |
1288 | ||
1289 | static int __init imm_driver_init(void) | |
1290 | { | |
1291 | printk("imm: Version %s\n", IMM_VERSION); | |
1292 | return parport_register_driver(&imm_driver); | |
1293 | } | |
1294 | ||
1295 | static void __exit imm_driver_exit(void) | |
1296 | { | |
1297 | parport_unregister_driver(&imm_driver); | |
1298 | } | |
1299 | ||
1300 | module_init(imm_driver_init); | |
1301 | module_exit(imm_driver_exit); | |
1302 | ||
1303 | MODULE_LICENSE("GPL"); |