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