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