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09c434b8 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1da177e4 LT |
2 | /* imm.c -- low level driver for the IOMEGA MatchMaker |
3 | * parallel port SCSI host adapter. | |
4 | * | |
5 | * (The IMM is the embedded controller in the ZIP Plus drive.) | |
6 | * | |
25985edc | 7 | * My unofficial company acronym list is 21 pages long: |
1da177e4 LT |
8 | * FLA: Four letter acronym with built in facility for |
9 | * future expansion to five letters. | |
10 | */ | |
11 | ||
1da177e4 LT |
12 | #include <linux/init.h> |
13 | #include <linux/kernel.h> | |
14 | #include <linux/module.h> | |
15 | #include <linux/blkdev.h> | |
16 | #include <linux/parport.h> | |
17 | #include <linux/workqueue.h> | |
68b3aa7c | 18 | #include <linux/delay.h> |
5a0e3ad6 | 19 | #include <linux/slab.h> |
1da177e4 LT |
20 | #include <asm/io.h> |
21 | ||
22 | #include <scsi/scsi.h> | |
23 | #include <scsi/scsi_cmnd.h> | |
24 | #include <scsi/scsi_device.h> | |
25 | #include <scsi/scsi_host.h> | |
26 | ||
27 | /* The following #define is to avoid a clash with hosts.c */ | |
28 | #define IMM_PROBE_SPP 0x0001 | |
29 | #define IMM_PROBE_PS2 0x0002 | |
30 | #define IMM_PROBE_ECR 0x0010 | |
31 | #define IMM_PROBE_EPP17 0x0100 | |
32 | #define IMM_PROBE_EPP19 0x0200 | |
33 | ||
34 | ||
35 | typedef struct { | |
36 | struct pardevice *dev; /* Parport device entry */ | |
37 | int base; /* Actual port address */ | |
38 | int base_hi; /* Hi Base address for ECP-ISA chipset */ | |
39 | int mode; /* Transfer mode */ | |
40 | struct scsi_cmnd *cur_cmd; /* Current queued command */ | |
c4028958 | 41 | struct delayed_work imm_tq; /* Polling interrupt stuff */ |
1da177e4 LT |
42 | unsigned long jstart; /* Jiffies at start */ |
43 | unsigned failed:1; /* Failure flag */ | |
44 | unsigned dp:1; /* Data phase present */ | |
45 | unsigned rd:1; /* Read data in data phase */ | |
46 | unsigned wanted:1; /* Parport sharing busy flag */ | |
a290dd57 | 47 | unsigned int dev_no; /* Device number */ |
1da177e4 LT |
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) | |
6b66f09c | 69 | imm_scsi_pointer(dev->cur_cmd)->phase = 1; |
1da177e4 LT |
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) { | |
9ffeca3e SM |
81 | if (parport_claim(dev->dev) == 0) { |
82 | got_it(dev); | |
83 | dev->wanted = 0; | |
84 | } | |
1da177e4 LT |
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 | */ | |
fa5fd368 | 127 | static int imm_write_info(struct Scsi_Host *host, char *buffer, int length) |
1da177e4 | 128 | { |
fa5fd368 | 129 | imm_struct *dev = imm_dev(host); |
1da177e4 LT |
130 | |
131 | if ((length > 5) && (strncmp(buffer, "mode=", 5) == 0)) { | |
fa5fd368 | 132 | dev->mode = simple_strtoul(buffer + 5, NULL, 0); |
1da177e4 LT |
133 | return length; |
134 | } | |
135 | printk("imm /proc: invalid variable\n"); | |
fa5fd368 | 136 | return -EINVAL; |
1da177e4 LT |
137 | } |
138 | ||
fa5fd368 | 139 | static int imm_show_info(struct seq_file *m, struct Scsi_Host *host) |
1da177e4 LT |
140 | { |
141 | imm_struct *dev = imm_dev(host); | |
1da177e4 | 142 | |
fa5fd368 AV |
143 | seq_printf(m, "Version : %s\n", IMM_VERSION); |
144 | seq_printf(m, "Parport : %s\n", dev->dev->port->name); | |
145 | seq_printf(m, "Mode : %s\n", IMM_MODE_STRING[dev->mode]); | |
146 | return 0; | |
1da177e4 LT |
147 | } |
148 | ||
149 | #if IMM_DEBUG > 0 | |
150 | #define imm_fail(x,y) printk("imm: imm_fail(%i) from %s at line %d\n",\ | |
cadbd4a5 | 151 | y, __func__, __LINE__); imm_fail_func(x,y); |
1da177e4 LT |
152 | static inline void |
153 | imm_fail_func(imm_struct *dev, int error_code) | |
154 | #else | |
155 | static inline void | |
156 | imm_fail(imm_struct *dev, int error_code) | |
157 | #endif | |
158 | { | |
159 | /* If we fail a device then we trash status / message bytes */ | |
160 | if (dev->cur_cmd) { | |
161 | dev->cur_cmd->result = error_code << 16; | |
162 | dev->failed = 1; | |
163 | } | |
164 | } | |
165 | ||
166 | /* | |
167 | * Wait for the high bit to be set. | |
168 | * | |
169 | * In principle, this could be tied to an interrupt, but the adapter | |
170 | * doesn't appear to be designed to support interrupts. We spin on | |
171 | * the 0x80 ready bit. | |
172 | */ | |
173 | static unsigned char imm_wait(imm_struct *dev) | |
174 | { | |
175 | int k; | |
176 | unsigned short ppb = dev->base; | |
177 | unsigned char r; | |
178 | ||
179 | w_ctr(ppb, 0x0c); | |
180 | ||
181 | k = IMM_SPIN_TMO; | |
182 | do { | |
183 | r = r_str(ppb); | |
184 | k--; | |
185 | udelay(1); | |
186 | } | |
187 | while (!(r & 0x80) && (k)); | |
188 | ||
189 | /* | |
190 | * STR register (LPT base+1) to SCSI mapping: | |
191 | * | |
192 | * STR imm imm | |
193 | * =================================== | |
194 | * 0x80 S_REQ S_REQ | |
195 | * 0x40 !S_BSY (????) | |
196 | * 0x20 !S_CD !S_CD | |
197 | * 0x10 !S_IO !S_IO | |
198 | * 0x08 (????) !S_BSY | |
199 | * | |
200 | * imm imm meaning | |
201 | * ================================== | |
202 | * 0xf0 0xb8 Bit mask | |
203 | * 0xc0 0x88 ZIP wants more data | |
204 | * 0xd0 0x98 ZIP wants to send more data | |
205 | * 0xe0 0xa8 ZIP is expecting SCSI command data | |
206 | * 0xf0 0xb8 end of transfer, ZIP is sending status | |
207 | */ | |
208 | w_ctr(ppb, 0x04); | |
209 | if (k) | |
210 | return (r & 0xb8); | |
211 | ||
212 | /* Counter expired - Time out occurred */ | |
213 | imm_fail(dev, DID_TIME_OUT); | |
214 | printk("imm timeout in imm_wait\n"); | |
215 | return 0; /* command timed out */ | |
216 | } | |
217 | ||
218 | static int imm_negotiate(imm_struct * tmp) | |
219 | { | |
220 | /* | |
221 | * The following is supposedly the IEEE 1284-1994 negotiate | |
222 | * sequence. I have yet to obtain a copy of the above standard | |
223 | * so this is a bit of a guess... | |
224 | * | |
225 | * A fair chunk of this is based on the Linux parport implementation | |
226 | * of IEEE 1284. | |
227 | * | |
228 | * Return 0 if data available | |
229 | * 1 if no data available | |
230 | */ | |
231 | ||
232 | unsigned short base = tmp->base; | |
233 | unsigned char a, mode; | |
234 | ||
235 | switch (tmp->mode) { | |
236 | case IMM_NIBBLE: | |
237 | mode = 0x00; | |
238 | break; | |
239 | case IMM_PS2: | |
240 | mode = 0x01; | |
241 | break; | |
242 | default: | |
243 | return 0; | |
244 | } | |
245 | ||
246 | w_ctr(base, 0x04); | |
247 | udelay(5); | |
248 | w_dtr(base, mode); | |
249 | udelay(100); | |
250 | w_ctr(base, 0x06); | |
251 | udelay(5); | |
252 | a = (r_str(base) & 0x20) ? 0 : 1; | |
253 | udelay(5); | |
254 | w_ctr(base, 0x07); | |
255 | udelay(5); | |
256 | w_ctr(base, 0x06); | |
257 | ||
258 | if (a) { | |
259 | printk | |
260 | ("IMM: IEEE1284 negotiate indicates no data available.\n"); | |
261 | imm_fail(tmp, DID_ERROR); | |
262 | } | |
263 | return a; | |
264 | } | |
265 | ||
266 | /* | |
267 | * Clear EPP timeout bit. | |
268 | */ | |
269 | static inline void epp_reset(unsigned short ppb) | |
270 | { | |
271 | int i; | |
272 | ||
273 | i = r_str(ppb); | |
274 | w_str(ppb, i); | |
275 | w_str(ppb, i & 0xfe); | |
276 | } | |
277 | ||
278 | /* | |
279 | * Wait for empty ECP fifo (if we are in ECP fifo mode only) | |
280 | */ | |
281 | static inline void ecp_sync(imm_struct *dev) | |
282 | { | |
283 | int i, ppb_hi = dev->base_hi; | |
284 | ||
285 | if (ppb_hi == 0) | |
286 | return; | |
287 | ||
288 | if ((r_ecr(ppb_hi) & 0xe0) == 0x60) { /* mode 011 == ECP fifo mode */ | |
289 | for (i = 0; i < 100; i++) { | |
290 | if (r_ecr(ppb_hi) & 0x01) | |
291 | return; | |
292 | udelay(5); | |
293 | } | |
294 | printk("imm: ECP sync failed as data still present in FIFO.\n"); | |
295 | } | |
296 | } | |
297 | ||
298 | static int imm_byte_out(unsigned short base, const char *buffer, int len) | |
299 | { | |
300 | int i; | |
301 | ||
302 | w_ctr(base, 0x4); /* apparently a sane mode */ | |
303 | for (i = len >> 1; i; i--) { | |
304 | w_dtr(base, *buffer++); | |
305 | w_ctr(base, 0x5); /* Drop STROBE low */ | |
306 | w_dtr(base, *buffer++); | |
307 | w_ctr(base, 0x0); /* STROBE high + INIT low */ | |
308 | } | |
309 | w_ctr(base, 0x4); /* apparently a sane mode */ | |
310 | return 1; /* All went well - we hope! */ | |
311 | } | |
312 | ||
313 | static int imm_nibble_in(unsigned short base, char *buffer, int len) | |
314 | { | |
315 | unsigned char l; | |
316 | int i; | |
317 | ||
318 | /* | |
319 | * The following is based on documented timing signals | |
320 | */ | |
321 | w_ctr(base, 0x4); | |
322 | for (i = len; i; i--) { | |
323 | w_ctr(base, 0x6); | |
324 | l = (r_str(base) & 0xf0) >> 4; | |
325 | w_ctr(base, 0x5); | |
326 | *buffer++ = (r_str(base) & 0xf0) | l; | |
327 | w_ctr(base, 0x4); | |
328 | } | |
329 | return 1; /* All went well - we hope! */ | |
330 | } | |
331 | ||
332 | static int imm_byte_in(unsigned short base, char *buffer, int len) | |
333 | { | |
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, 0x26); | |
342 | *buffer++ = r_dtr(base); | |
343 | w_ctr(base, 0x25); | |
344 | } | |
345 | return 1; /* All went well - we hope! */ | |
346 | } | |
347 | ||
348 | static int imm_out(imm_struct *dev, char *buffer, int len) | |
349 | { | |
350 | unsigned short ppb = dev->base; | |
351 | int r = imm_wait(dev); | |
352 | ||
353 | /* | |
354 | * Make sure that: | |
355 | * a) the SCSI bus is BUSY (device still listening) | |
356 | * b) the device is listening | |
357 | */ | |
358 | if ((r & 0x18) != 0x08) { | |
359 | imm_fail(dev, DID_ERROR); | |
360 | printk("IMM: returned SCSI status %2x\n", r); | |
361 | return 0; | |
362 | } | |
363 | switch (dev->mode) { | |
364 | case IMM_EPP_32: | |
365 | case IMM_EPP_16: | |
366 | case IMM_EPP_8: | |
367 | epp_reset(ppb); | |
368 | w_ctr(ppb, 0x4); | |
369 | #ifdef CONFIG_SCSI_IZIP_EPP16 | |
370 | if (!(((long) buffer | len) & 0x01)) | |
371 | outsw(ppb + 4, buffer, len >> 1); | |
372 | #else | |
373 | if (!(((long) buffer | len) & 0x03)) | |
374 | outsl(ppb + 4, buffer, len >> 2); | |
375 | #endif | |
376 | else | |
377 | outsb(ppb + 4, buffer, len); | |
378 | w_ctr(ppb, 0xc); | |
379 | r = !(r_str(ppb) & 0x01); | |
380 | w_ctr(ppb, 0xc); | |
381 | ecp_sync(dev); | |
382 | break; | |
383 | ||
384 | case IMM_NIBBLE: | |
385 | case IMM_PS2: | |
386 | /* 8 bit output, with a loop */ | |
387 | r = imm_byte_out(ppb, buffer, len); | |
388 | break; | |
389 | ||
390 | default: | |
391 | printk("IMM: bug in imm_out()\n"); | |
392 | r = 0; | |
393 | } | |
394 | return r; | |
395 | } | |
396 | ||
397 | static int imm_in(imm_struct *dev, char *buffer, int len) | |
398 | { | |
399 | unsigned short ppb = dev->base; | |
400 | int r = imm_wait(dev); | |
401 | ||
402 | /* | |
403 | * Make sure that: | |
404 | * a) the SCSI bus is BUSY (device still listening) | |
405 | * b) the device is sending data | |
406 | */ | |
407 | if ((r & 0x18) != 0x18) { | |
408 | imm_fail(dev, DID_ERROR); | |
409 | return 0; | |
410 | } | |
411 | switch (dev->mode) { | |
412 | case IMM_NIBBLE: | |
413 | /* 4 bit input, with a loop */ | |
414 | r = imm_nibble_in(ppb, buffer, len); | |
415 | w_ctr(ppb, 0xc); | |
416 | break; | |
417 | ||
418 | case IMM_PS2: | |
419 | /* 8 bit input, with a loop */ | |
420 | r = imm_byte_in(ppb, buffer, len); | |
421 | w_ctr(ppb, 0xc); | |
422 | break; | |
423 | ||
424 | case IMM_EPP_32: | |
425 | case IMM_EPP_16: | |
426 | case IMM_EPP_8: | |
427 | epp_reset(ppb); | |
428 | w_ctr(ppb, 0x24); | |
429 | #ifdef CONFIG_SCSI_IZIP_EPP16 | |
430 | if (!(((long) buffer | len) & 0x01)) | |
431 | insw(ppb + 4, buffer, len >> 1); | |
432 | #else | |
433 | if (!(((long) buffer | len) & 0x03)) | |
434 | insl(ppb + 4, buffer, len >> 2); | |
435 | #endif | |
436 | else | |
437 | insb(ppb + 4, buffer, len); | |
438 | w_ctr(ppb, 0x2c); | |
439 | r = !(r_str(ppb) & 0x01); | |
440 | w_ctr(ppb, 0x2c); | |
441 | ecp_sync(dev); | |
442 | break; | |
443 | ||
444 | default: | |
445 | printk("IMM: bug in imm_ins()\n"); | |
446 | r = 0; | |
447 | break; | |
448 | } | |
449 | return r; | |
450 | } | |
451 | ||
452 | static int imm_cpp(unsigned short ppb, unsigned char b) | |
453 | { | |
454 | /* | |
455 | * Comments on udelay values refer to the | |
456 | * Command Packet Protocol (CPP) timing diagram. | |
457 | */ | |
458 | ||
459 | unsigned char s1, s2, s3; | |
460 | w_ctr(ppb, 0x0c); | |
461 | udelay(2); /* 1 usec - infinite */ | |
462 | w_dtr(ppb, 0xaa); | |
463 | udelay(10); /* 7 usec - infinite */ | |
464 | w_dtr(ppb, 0x55); | |
465 | udelay(10); /* 7 usec - infinite */ | |
466 | w_dtr(ppb, 0x00); | |
467 | udelay(10); /* 7 usec - infinite */ | |
468 | w_dtr(ppb, 0xff); | |
469 | udelay(10); /* 7 usec - infinite */ | |
470 | s1 = r_str(ppb) & 0xb8; | |
471 | w_dtr(ppb, 0x87); | |
472 | udelay(10); /* 7 usec - infinite */ | |
473 | s2 = r_str(ppb) & 0xb8; | |
474 | w_dtr(ppb, 0x78); | |
475 | udelay(10); /* 7 usec - infinite */ | |
476 | s3 = r_str(ppb) & 0x38; | |
477 | /* | |
478 | * Values for b are: | |
479 | * 0000 00aa Assign address aa to current device | |
480 | * 0010 00aa Select device aa in EPP Winbond mode | |
481 | * 0010 10aa Select device aa in EPP mode | |
482 | * 0011 xxxx Deselect all devices | |
483 | * 0110 00aa Test device aa | |
484 | * 1101 00aa Select device aa in ECP mode | |
485 | * 1110 00aa Select device aa in Compatible mode | |
486 | */ | |
487 | w_dtr(ppb, b); | |
488 | udelay(2); /* 1 usec - infinite */ | |
489 | w_ctr(ppb, 0x0c); | |
490 | udelay(10); /* 7 usec - infinite */ | |
491 | w_ctr(ppb, 0x0d); | |
492 | udelay(2); /* 1 usec - infinite */ | |
493 | w_ctr(ppb, 0x0c); | |
494 | udelay(10); /* 7 usec - infinite */ | |
495 | w_dtr(ppb, 0xff); | |
496 | udelay(10); /* 7 usec - infinite */ | |
497 | ||
498 | /* | |
499 | * The following table is electrical pin values. | |
500 | * (BSY is inverted at the CTR register) | |
501 | * | |
502 | * BSY ACK POut SEL Fault | |
503 | * S1 0 X 1 1 1 | |
504 | * S2 1 X 0 1 1 | |
505 | * S3 L X 1 1 S | |
506 | * | |
507 | * L => Last device in chain | |
508 | * S => Selected | |
509 | * | |
510 | * Observered values for S1,S2,S3 are: | |
511 | * Disconnect => f8/58/78 | |
512 | * Connect => f8/58/70 | |
513 | */ | |
514 | if ((s1 == 0xb8) && (s2 == 0x18) && (s3 == 0x30)) | |
515 | return 1; /* Connected */ | |
516 | if ((s1 == 0xb8) && (s2 == 0x18) && (s3 == 0x38)) | |
517 | return 0; /* Disconnected */ | |
518 | ||
519 | return -1; /* No device present */ | |
520 | } | |
521 | ||
522 | static inline int imm_connect(imm_struct *dev, int flag) | |
523 | { | |
524 | unsigned short ppb = dev->base; | |
525 | ||
526 | imm_cpp(ppb, 0xe0); /* Select device 0 in compatible mode */ | |
527 | imm_cpp(ppb, 0x30); /* Disconnect all devices */ | |
528 | ||
529 | if ((dev->mode == IMM_EPP_8) || | |
530 | (dev->mode == IMM_EPP_16) || | |
531 | (dev->mode == IMM_EPP_32)) | |
532 | return imm_cpp(ppb, 0x28); /* Select device 0 in EPP mode */ | |
533 | return imm_cpp(ppb, 0xe0); /* Select device 0 in compatible mode */ | |
534 | } | |
535 | ||
536 | static void imm_disconnect(imm_struct *dev) | |
537 | { | |
538 | imm_cpp(dev->base, 0x30); /* Disconnect all devices */ | |
539 | } | |
540 | ||
541 | static int imm_select(imm_struct *dev, int target) | |
542 | { | |
543 | int k; | |
544 | unsigned short ppb = dev->base; | |
545 | ||
546 | /* | |
547 | * Firstly we want to make sure there is nothing | |
548 | * holding onto the SCSI bus. | |
549 | */ | |
550 | w_ctr(ppb, 0xc); | |
551 | ||
552 | k = IMM_SELECT_TMO; | |
553 | do { | |
554 | k--; | |
555 | } while ((r_str(ppb) & 0x08) && (k)); | |
556 | ||
557 | if (!k) | |
558 | return 0; | |
559 | ||
560 | /* | |
561 | * Now assert the SCSI ID (HOST and TARGET) on the data bus | |
562 | */ | |
563 | w_ctr(ppb, 0x4); | |
564 | w_dtr(ppb, 0x80 | (1 << target)); | |
565 | udelay(1); | |
566 | ||
567 | /* | |
568 | * Deassert SELIN first followed by STROBE | |
569 | */ | |
570 | w_ctr(ppb, 0xc); | |
571 | w_ctr(ppb, 0xd); | |
572 | ||
573 | /* | |
574 | * ACK should drop low while SELIN is deasserted. | |
575 | * FAULT should drop low when the SCSI device latches the bus. | |
576 | */ | |
577 | k = IMM_SELECT_TMO; | |
578 | do { | |
579 | k--; | |
580 | } | |
581 | while (!(r_str(ppb) & 0x08) && (k)); | |
582 | ||
583 | /* | |
584 | * Place the interface back into a sane state (status mode) | |
585 | */ | |
586 | w_ctr(ppb, 0xc); | |
587 | return (k) ? 1 : 0; | |
588 | } | |
589 | ||
590 | static int imm_init(imm_struct *dev) | |
591 | { | |
592 | if (imm_connect(dev, 0) != 1) | |
593 | return -EIO; | |
594 | imm_reset_pulse(dev->base); | |
68b3aa7c | 595 | mdelay(1); /* Delay to allow devices to settle */ |
1da177e4 | 596 | imm_disconnect(dev); |
68b3aa7c | 597 | mdelay(1); /* Another delay to allow devices to settle */ |
1da177e4 LT |
598 | return device_check(dev); |
599 | } | |
600 | ||
601 | static inline int imm_send_command(struct scsi_cmnd *cmd) | |
602 | { | |
603 | imm_struct *dev = imm_dev(cmd->device->host); | |
604 | int k; | |
605 | ||
606 | /* NOTE: IMM uses byte pairs */ | |
607 | for (k = 0; k < cmd->cmd_len; k += 2) | |
608 | if (!imm_out(dev, &cmd->cmnd[k], 2)) | |
609 | return 0; | |
610 | return 1; | |
611 | } | |
612 | ||
613 | /* | |
614 | * The bulk flag enables some optimisations in the data transfer loops, | |
615 | * it should be true for any command that transfers data in integral | |
616 | * numbers of sectors. | |
617 | * | |
618 | * The driver appears to remain stable if we speed up the parallel port | |
619 | * i/o in this function, but not elsewhere. | |
620 | */ | |
6b66f09c | 621 | static int imm_completion(struct scsi_cmnd *const cmd) |
1da177e4 LT |
622 | { |
623 | /* Return codes: | |
624 | * -1 Error | |
625 | * 0 Told to schedule | |
626 | * 1 Finished data transfer | |
627 | */ | |
6b66f09c | 628 | struct scsi_pointer *scsi_pointer = imm_scsi_pointer(cmd); |
1da177e4 LT |
629 | imm_struct *dev = imm_dev(cmd->device->host); |
630 | unsigned short ppb = dev->base; | |
631 | unsigned long start_jiffies = jiffies; | |
632 | ||
633 | unsigned char r, v; | |
634 | int fast, bulk, status; | |
635 | ||
636 | v = cmd->cmnd[0]; | |
637 | bulk = ((v == READ_6) || | |
638 | (v == READ_10) || (v == WRITE_6) || (v == WRITE_10)); | |
639 | ||
640 | /* | |
641 | * We only get here if the drive is ready to comunicate, | |
642 | * hence no need for a full imm_wait. | |
643 | */ | |
644 | w_ctr(ppb, 0x0c); | |
645 | r = (r_str(ppb) & 0xb8); | |
646 | ||
647 | /* | |
648 | * while (device is not ready to send status byte) | |
649 | * loop; | |
650 | */ | |
651 | while (r != (unsigned char) 0xb8) { | |
652 | /* | |
653 | * If we have been running for more than a full timer tick | |
654 | * then take a rest. | |
655 | */ | |
656 | if (time_after(jiffies, start_jiffies + 1)) | |
657 | return 0; | |
658 | ||
659 | /* | |
660 | * FAIL if: | |
661 | * a) Drive status is screwy (!ready && !present) | |
662 | * b) Drive is requesting/sending more data than expected | |
663 | */ | |
6b66f09c | 664 | if ((r & 0x88) != 0x88 || scsi_pointer->this_residual <= 0) { |
1da177e4 LT |
665 | imm_fail(dev, DID_ERROR); |
666 | return -1; /* ERROR_RETURN */ | |
667 | } | |
668 | /* determine if we should use burst I/O */ | |
669 | if (dev->rd == 0) { | |
6b66f09c BVA |
670 | fast = bulk && scsi_pointer->this_residual >= |
671 | IMM_BURST_SIZE ? IMM_BURST_SIZE : 2; | |
672 | status = imm_out(dev, scsi_pointer->ptr, fast); | |
1da177e4 | 673 | } else { |
6b66f09c BVA |
674 | fast = bulk && scsi_pointer->this_residual >= |
675 | IMM_BURST_SIZE ? IMM_BURST_SIZE : 1; | |
676 | status = imm_in(dev, scsi_pointer->ptr, fast); | |
1da177e4 LT |
677 | } |
678 | ||
6b66f09c BVA |
679 | scsi_pointer->ptr += fast; |
680 | scsi_pointer->this_residual -= fast; | |
1da177e4 LT |
681 | |
682 | if (!status) { | |
683 | imm_fail(dev, DID_BUS_BUSY); | |
684 | return -1; /* ERROR_RETURN */ | |
685 | } | |
6b66f09c | 686 | if (scsi_pointer->buffer && !scsi_pointer->this_residual) { |
1da177e4 | 687 | /* if scatter/gather, advance to the next segment */ |
6b66f09c BVA |
688 | if (scsi_pointer->buffers_residual--) { |
689 | scsi_pointer->buffer = | |
690 | sg_next(scsi_pointer->buffer); | |
691 | scsi_pointer->this_residual = | |
692 | scsi_pointer->buffer->length; | |
693 | scsi_pointer->ptr = sg_virt(scsi_pointer->buffer); | |
1da177e4 LT |
694 | |
695 | /* | |
696 | * Make sure that we transfer even number of bytes | |
697 | * otherwise it makes imm_byte_out() messy. | |
698 | */ | |
6b66f09c BVA |
699 | if (scsi_pointer->this_residual & 0x01) |
700 | scsi_pointer->this_residual++; | |
1da177e4 LT |
701 | } |
702 | } | |
703 | /* Now check to see if the drive is ready to comunicate */ | |
704 | w_ctr(ppb, 0x0c); | |
705 | r = (r_str(ppb) & 0xb8); | |
706 | ||
707 | /* If not, drop back down to the scheduler and wait a timer tick */ | |
708 | if (!(r & 0x80)) | |
709 | return 0; | |
710 | } | |
711 | return 1; /* FINISH_RETURN */ | |
712 | } | |
713 | ||
714 | /* | |
715 | * Since the IMM itself doesn't generate interrupts, we use | |
716 | * the scheduler's task queue to generate a stream of call-backs and | |
717 | * complete the request when the drive is ready. | |
718 | */ | |
c4028958 | 719 | static void imm_interrupt(struct work_struct *work) |
1da177e4 | 720 | { |
c4028958 | 721 | imm_struct *dev = container_of(work, imm_struct, imm_tq.work); |
1da177e4 LT |
722 | struct scsi_cmnd *cmd = dev->cur_cmd; |
723 | struct Scsi_Host *host = cmd->device->host; | |
724 | unsigned long flags; | |
725 | ||
1da177e4 | 726 | if (imm_engine(dev, cmd)) { |
1da177e4 LT |
727 | schedule_delayed_work(&dev->imm_tq, 1); |
728 | return; | |
729 | } | |
730 | /* Command must of completed hence it is safe to let go... */ | |
731 | #if IMM_DEBUG > 0 | |
732 | switch ((cmd->result >> 16) & 0xff) { | |
733 | case DID_OK: | |
734 | break; | |
735 | case DID_NO_CONNECT: | |
736 | printk("imm: no device at SCSI ID %i\n", cmd->device->id); | |
737 | break; | |
738 | case DID_BUS_BUSY: | |
739 | printk("imm: BUS BUSY - EPP timeout detected\n"); | |
740 | break; | |
741 | case DID_TIME_OUT: | |
742 | printk("imm: unknown timeout\n"); | |
743 | break; | |
744 | case DID_ABORT: | |
745 | printk("imm: told to abort\n"); | |
746 | break; | |
747 | case DID_PARITY: | |
748 | printk("imm: parity error (???)\n"); | |
749 | break; | |
750 | case DID_ERROR: | |
751 | printk("imm: internal driver error\n"); | |
752 | break; | |
753 | case DID_RESET: | |
754 | printk("imm: told to reset device\n"); | |
755 | break; | |
756 | case DID_BAD_INTR: | |
757 | printk("imm: bad interrupt (???)\n"); | |
758 | break; | |
759 | default: | |
760 | printk("imm: bad return code (%02x)\n", | |
761 | (cmd->result >> 16) & 0xff); | |
762 | } | |
763 | #endif | |
764 | ||
6b66f09c | 765 | if (imm_scsi_pointer(cmd)->phase > 1) |
1da177e4 LT |
766 | imm_disconnect(dev); |
767 | ||
768 | imm_pb_dismiss(dev); | |
769 | ||
770 | spin_lock_irqsave(host->host_lock, flags); | |
771 | dev->cur_cmd = NULL; | |
0233196e | 772 | scsi_done(cmd); |
1da177e4 LT |
773 | spin_unlock_irqrestore(host->host_lock, flags); |
774 | return; | |
775 | } | |
776 | ||
6b66f09c | 777 | static int imm_engine(imm_struct *dev, struct scsi_cmnd *const cmd) |
1da177e4 | 778 | { |
6b66f09c | 779 | struct scsi_pointer *scsi_pointer = imm_scsi_pointer(cmd); |
1da177e4 LT |
780 | unsigned short ppb = dev->base; |
781 | unsigned char l = 0, h = 0; | |
782 | int retv, x; | |
783 | ||
784 | /* First check for any errors that may have occurred | |
785 | * Here we check for internal errors | |
786 | */ | |
787 | if (dev->failed) | |
788 | return 0; | |
789 | ||
6b66f09c | 790 | switch (scsi_pointer->phase) { |
1da177e4 LT |
791 | case 0: /* Phase 0 - Waiting for parport */ |
792 | if (time_after(jiffies, dev->jstart + HZ)) { | |
793 | /* | |
794 | * We waited more than a second | |
795 | * for parport to call us | |
796 | */ | |
797 | imm_fail(dev, DID_BUS_BUSY); | |
798 | return 0; | |
799 | } | |
800 | return 1; /* wait until imm_wakeup claims parport */ | |
9fa29a67 GS |
801 | |
802 | case 1: /* Phase 1 - Connected */ | |
1da177e4 | 803 | imm_connect(dev, CONNECT_EPP_MAYBE); |
6b66f09c | 804 | scsi_pointer->phase++; |
df561f66 | 805 | fallthrough; |
1da177e4 | 806 | |
9fa29a67 | 807 | case 2: /* Phase 2 - We are now talking to the scsi bus */ |
422c0d61 | 808 | if (!imm_select(dev, scmd_id(cmd))) { |
1da177e4 LT |
809 | imm_fail(dev, DID_NO_CONNECT); |
810 | return 0; | |
811 | } | |
6b66f09c | 812 | scsi_pointer->phase++; |
df561f66 | 813 | fallthrough; |
1da177e4 | 814 | |
9fa29a67 | 815 | case 3: /* Phase 3 - Ready to accept a command */ |
1da177e4 LT |
816 | w_ctr(ppb, 0x0c); |
817 | if (!(r_str(ppb) & 0x80)) | |
818 | return 1; | |
819 | ||
820 | if (!imm_send_command(cmd)) | |
821 | return 0; | |
6b66f09c | 822 | scsi_pointer->phase++; |
df561f66 | 823 | fallthrough; |
1da177e4 | 824 | |
9fa29a67 | 825 | case 4: /* Phase 4 - Setup scatter/gather buffers */ |
3ce7c658 | 826 | if (scsi_bufflen(cmd)) { |
6b66f09c BVA |
827 | scsi_pointer->buffer = scsi_sglist(cmd); |
828 | scsi_pointer->this_residual = scsi_pointer->buffer->length; | |
829 | scsi_pointer->ptr = sg_virt(scsi_pointer->buffer); | |
1da177e4 | 830 | } else { |
6b66f09c BVA |
831 | scsi_pointer->buffer = NULL; |
832 | scsi_pointer->this_residual = 0; | |
833 | scsi_pointer->ptr = NULL; | |
1da177e4 | 834 | } |
6b66f09c BVA |
835 | scsi_pointer->buffers_residual = scsi_sg_count(cmd) - 1; |
836 | scsi_pointer->phase++; | |
837 | if (scsi_pointer->this_residual & 0x01) | |
838 | scsi_pointer->this_residual++; | |
df561f66 | 839 | fallthrough; |
9fa29a67 GS |
840 | |
841 | case 5: /* Phase 5 - Pre-Data transfer stage */ | |
1da177e4 LT |
842 | /* Spin lock for BUSY */ |
843 | w_ctr(ppb, 0x0c); | |
844 | if (!(r_str(ppb) & 0x80)) | |
845 | return 1; | |
846 | ||
847 | /* Require negotiation for read requests */ | |
848 | x = (r_str(ppb) & 0xb8); | |
849 | dev->rd = (x & 0x10) ? 1 : 0; | |
850 | dev->dp = (x & 0x20) ? 0 : 1; | |
851 | ||
852 | if ((dev->dp) && (dev->rd)) | |
853 | if (imm_negotiate(dev)) | |
854 | return 0; | |
6b66f09c | 855 | scsi_pointer->phase++; |
df561f66 | 856 | fallthrough; |
1da177e4 | 857 | |
9fa29a67 | 858 | case 6: /* Phase 6 - Data transfer stage */ |
1da177e4 LT |
859 | /* Spin lock for BUSY */ |
860 | w_ctr(ppb, 0x0c); | |
861 | if (!(r_str(ppb) & 0x80)) | |
862 | return 1; | |
863 | ||
864 | if (dev->dp) { | |
865 | retv = imm_completion(cmd); | |
866 | if (retv == -1) | |
867 | return 0; | |
868 | if (retv == 0) | |
869 | return 1; | |
870 | } | |
6b66f09c | 871 | scsi_pointer->phase++; |
df561f66 | 872 | fallthrough; |
1da177e4 | 873 | |
9fa29a67 | 874 | case 7: /* Phase 7 - Post data transfer stage */ |
1da177e4 LT |
875 | if ((dev->dp) && (dev->rd)) { |
876 | if ((dev->mode == IMM_NIBBLE) || (dev->mode == IMM_PS2)) { | |
877 | w_ctr(ppb, 0x4); | |
878 | w_ctr(ppb, 0xc); | |
879 | w_ctr(ppb, 0xe); | |
880 | w_ctr(ppb, 0x4); | |
881 | } | |
882 | } | |
6b66f09c | 883 | scsi_pointer->phase++; |
df561f66 | 884 | fallthrough; |
1da177e4 | 885 | |
9fa29a67 | 886 | case 8: /* Phase 8 - Read status/message */ |
1da177e4 LT |
887 | /* Check for data overrun */ |
888 | if (imm_wait(dev) != (unsigned char) 0xb8) { | |
889 | imm_fail(dev, DID_ERROR); | |
890 | return 0; | |
891 | } | |
892 | if (imm_negotiate(dev)) | |
893 | return 0; | |
894 | if (imm_in(dev, &l, 1)) { /* read status byte */ | |
895 | /* Check for optional message byte */ | |
896 | if (imm_wait(dev) == (unsigned char) 0xb8) | |
897 | imm_in(dev, &h, 1); | |
6bec4c38 | 898 | cmd->result = (DID_OK << 16) | (l & STATUS_MASK); |
1da177e4 LT |
899 | } |
900 | if ((dev->mode == IMM_NIBBLE) || (dev->mode == IMM_PS2)) { | |
901 | w_ctr(ppb, 0x4); | |
902 | w_ctr(ppb, 0xc); | |
903 | w_ctr(ppb, 0xe); | |
904 | w_ctr(ppb, 0x4); | |
905 | } | |
906 | return 0; /* Finished */ | |
1da177e4 LT |
907 | |
908 | default: | |
909 | printk("imm: Invalid scsi phase\n"); | |
910 | } | |
911 | return 0; | |
912 | } | |
913 | ||
af049dfd | 914 | static int imm_queuecommand_lck(struct scsi_cmnd *cmd) |
1da177e4 LT |
915 | { |
916 | imm_struct *dev = imm_dev(cmd->device->host); | |
917 | ||
918 | if (dev->cur_cmd) { | |
919 | printk("IMM: bug in imm_queuecommand\n"); | |
920 | return 0; | |
921 | } | |
922 | dev->failed = 0; | |
923 | dev->jstart = jiffies; | |
924 | dev->cur_cmd = cmd; | |
1da177e4 | 925 | cmd->result = DID_ERROR << 16; /* default return code */ |
6b66f09c | 926 | imm_scsi_pointer(cmd)->phase = 0; /* bus free */ |
1da177e4 | 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 | ||
6b66f09c | 965 | switch (imm_scsi_pointer(cmd)->phase) { |
1da177e4 LT |
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; | |
1da177e4 LT |
970 | default: /* SCSI command sent, can not abort */ |
971 | return FAILED; | |
1da177e4 LT |
972 | } |
973 | } | |
974 | ||
975 | static void imm_reset_pulse(unsigned int base) | |
976 | { | |
977 | w_ctr(base, 0x04); | |
978 | w_dtr(base, 0x40); | |
979 | udelay(1); | |
980 | w_ctr(base, 0x0c); | |
981 | w_ctr(base, 0x0d); | |
982 | udelay(50); | |
983 | w_ctr(base, 0x0c); | |
984 | w_ctr(base, 0x04); | |
985 | } | |
986 | ||
987 | static int imm_reset(struct scsi_cmnd *cmd) | |
988 | { | |
989 | imm_struct *dev = imm_dev(cmd->device->host); | |
990 | ||
6b66f09c | 991 | if (imm_scsi_pointer(cmd)->phase) |
1da177e4 LT |
992 | imm_disconnect(dev); |
993 | dev->cur_cmd = NULL; /* Forget the problem */ | |
994 | ||
995 | imm_connect(dev, CONNECT_NORMAL); | |
996 | imm_reset_pulse(dev->base); | |
68b3aa7c | 997 | mdelay(1); /* device settle delay */ |
1da177e4 | 998 | imm_disconnect(dev); |
68b3aa7c | 999 | mdelay(1); /* device settle delay */ |
1da177e4 LT |
1000 | return SUCCESS; |
1001 | } | |
1002 | ||
1003 | static int device_check(imm_struct *dev) | |
1004 | { | |
1005 | /* This routine looks for a device and then attempts to use EPP | |
1006 | to send a command. If all goes as planned then EPP is available. */ | |
1007 | ||
1008 | static char cmd[6] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }; | |
1009 | int loop, old_mode, status, k, ppb = dev->base; | |
1010 | unsigned char l; | |
1011 | ||
1012 | old_mode = dev->mode; | |
1013 | for (loop = 0; loop < 8; loop++) { | |
1014 | /* Attempt to use EPP for Test Unit Ready */ | |
1015 | if ((ppb & 0x0007) == 0x0000) | |
1016 | dev->mode = IMM_EPP_32; | |
1017 | ||
1018 | second_pass: | |
1019 | imm_connect(dev, CONNECT_EPP_MAYBE); | |
1020 | /* Select SCSI device */ | |
1021 | if (!imm_select(dev, loop)) { | |
1022 | imm_disconnect(dev); | |
1023 | continue; | |
1024 | } | |
1025 | printk("imm: Found device at ID %i, Attempting to use %s\n", | |
1026 | loop, IMM_MODE_STRING[dev->mode]); | |
1027 | ||
1028 | /* Send SCSI command */ | |
1029 | status = 1; | |
1030 | w_ctr(ppb, 0x0c); | |
1031 | for (l = 0; (l < 3) && (status); l++) | |
1032 | status = imm_out(dev, &cmd[l << 1], 2); | |
1033 | ||
1034 | if (!status) { | |
1035 | imm_disconnect(dev); | |
1036 | imm_connect(dev, CONNECT_EPP_MAYBE); | |
1037 | imm_reset_pulse(dev->base); | |
1038 | udelay(1000); | |
1039 | imm_disconnect(dev); | |
1040 | udelay(1000); | |
1041 | if (dev->mode == IMM_EPP_32) { | |
1042 | dev->mode = old_mode; | |
1043 | goto second_pass; | |
1044 | } | |
1045 | printk("imm: Unable to establish communication\n"); | |
1046 | return -EIO; | |
1047 | } | |
1048 | w_ctr(ppb, 0x0c); | |
1049 | ||
1050 | k = 1000000; /* 1 Second */ | |
1051 | do { | |
1052 | l = r_str(ppb); | |
1053 | k--; | |
1054 | udelay(1); | |
1055 | } while (!(l & 0x80) && (k)); | |
1056 | ||
1057 | l &= 0xb8; | |
1058 | ||
1059 | if (l != 0xb8) { | |
1060 | imm_disconnect(dev); | |
1061 | imm_connect(dev, CONNECT_EPP_MAYBE); | |
1062 | imm_reset_pulse(dev->base); | |
1063 | udelay(1000); | |
1064 | imm_disconnect(dev); | |
1065 | udelay(1000); | |
1066 | if (dev->mode == IMM_EPP_32) { | |
1067 | dev->mode = old_mode; | |
1068 | goto second_pass; | |
1069 | } | |
1070 | printk | |
1071 | ("imm: Unable to establish communication\n"); | |
1072 | return -EIO; | |
1073 | } | |
1074 | imm_disconnect(dev); | |
1075 | printk | |
1076 | ("imm: Communication established at 0x%x with ID %i using %s\n", | |
1077 | ppb, loop, IMM_MODE_STRING[dev->mode]); | |
1078 | imm_connect(dev, CONNECT_EPP_MAYBE); | |
1079 | imm_reset_pulse(dev->base); | |
1080 | udelay(1000); | |
1081 | imm_disconnect(dev); | |
1082 | udelay(1000); | |
1083 | return 0; | |
1084 | } | |
1085 | printk("imm: No devices found\n"); | |
1086 | return -ENODEV; | |
1087 | } | |
1088 | ||
979dca38 RD |
1089 | /* |
1090 | * imm cannot deal with highmem, so this causes all IO pages for this host | |
1091 | * to reside in low memory (hence mapped) | |
1092 | */ | |
1da177e4 LT |
1093 | static int imm_adjust_queue(struct scsi_device *device) |
1094 | { | |
1095 | blk_queue_bounce_limit(device->request_queue, BLK_BOUNCE_HIGH); | |
1096 | return 0; | |
1097 | } | |
1098 | ||
09dce26c | 1099 | static const struct scsi_host_template imm_template = { |
1da177e4 LT |
1100 | .module = THIS_MODULE, |
1101 | .proc_name = "imm", | |
fa5fd368 AV |
1102 | .show_info = imm_show_info, |
1103 | .write_info = imm_write_info, | |
1da177e4 LT |
1104 | .name = "Iomega VPI2 (imm) interface", |
1105 | .queuecommand = imm_queuecommand, | |
1106 | .eh_abort_handler = imm_abort, | |
1da177e4 LT |
1107 | .eh_host_reset_handler = imm_reset, |
1108 | .bios_param = imm_biosparam, | |
1109 | .this_id = 7, | |
1110 | .sg_tablesize = SG_ALL, | |
1da177e4 LT |
1111 | .can_queue = 1, |
1112 | .slave_alloc = imm_adjust_queue, | |
6b66f09c | 1113 | .cmd_size = sizeof(struct scsi_pointer), |
1da177e4 LT |
1114 | }; |
1115 | ||
1116 | /*************************************************************************** | |
1117 | * Parallel port probing routines * | |
1118 | ***************************************************************************/ | |
1119 | ||
1120 | static LIST_HEAD(imm_hosts); | |
1121 | ||
a290dd57 SM |
1122 | /* |
1123 | * Finds the first available device number that can be alloted to the | |
1124 | * new imm device and returns the address of the previous node so that | |
1125 | * we can add to the tail and have a list in the ascending order. | |
1126 | */ | |
1127 | ||
1128 | static inline imm_struct *find_parent(void) | |
1129 | { | |
1130 | imm_struct *dev, *par = NULL; | |
1131 | unsigned int cnt = 0; | |
1132 | ||
1133 | if (list_empty(&imm_hosts)) | |
1134 | return NULL; | |
1135 | ||
1136 | list_for_each_entry(dev, &imm_hosts, list) { | |
1137 | if (dev->dev_no != cnt) | |
1138 | return par; | |
1139 | cnt++; | |
1140 | par = dev; | |
1141 | } | |
1142 | ||
1143 | return par; | |
1144 | } | |
1145 | ||
1da177e4 LT |
1146 | static int __imm_attach(struct parport *pb) |
1147 | { | |
1148 | struct Scsi_Host *host; | |
a290dd57 | 1149 | imm_struct *dev, *temp; |
7259f0d0 | 1150 | DECLARE_WAIT_QUEUE_HEAD_ONSTACK(waiting); |
1da177e4 LT |
1151 | DEFINE_WAIT(wait); |
1152 | int ports; | |
1153 | int modes, ppb; | |
1154 | int err = -ENOMEM; | |
a290dd57 | 1155 | struct pardev_cb imm_cb; |
1da177e4 LT |
1156 | |
1157 | init_waitqueue_head(&waiting); | |
1158 | ||
dd00cc48 | 1159 | dev = kzalloc(sizeof(imm_struct), GFP_KERNEL); |
1da177e4 LT |
1160 | if (!dev) |
1161 | return -ENOMEM; | |
1162 | ||
1da177e4 LT |
1163 | |
1164 | dev->base = -1; | |
1165 | dev->mode = IMM_AUTODETECT; | |
1166 | INIT_LIST_HEAD(&dev->list); | |
1167 | ||
a290dd57 SM |
1168 | temp = find_parent(); |
1169 | if (temp) | |
1170 | dev->dev_no = temp->dev_no + 1; | |
1171 | ||
1172 | memset(&imm_cb, 0, sizeof(imm_cb)); | |
1173 | imm_cb.private = dev; | |
1174 | imm_cb.wakeup = imm_wakeup; | |
1da177e4 | 1175 | |
a290dd57 | 1176 | dev->dev = parport_register_dev_model(pb, "imm", &imm_cb, dev->dev_no); |
1da177e4 LT |
1177 | if (!dev->dev) |
1178 | goto out; | |
1179 | ||
1180 | ||
1181 | /* Claim the bus so it remembers what we do to the control | |
1182 | * registers. [ CTR and ECP ] | |
1183 | */ | |
1184 | err = -EBUSY; | |
1185 | dev->waiting = &waiting; | |
1186 | prepare_to_wait(&waiting, &wait, TASK_UNINTERRUPTIBLE); | |
1187 | if (imm_pb_claim(dev)) | |
1188 | schedule_timeout(3 * HZ); | |
1189 | if (dev->wanted) { | |
1190 | printk(KERN_ERR "imm%d: failed to claim parport because " | |
1191 | "a pardevice is owning the port for too long " | |
1192 | "time!\n", pb->number); | |
1193 | imm_pb_dismiss(dev); | |
1194 | dev->waiting = NULL; | |
1195 | finish_wait(&waiting, &wait); | |
1196 | goto out1; | |
1197 | } | |
1198 | dev->waiting = NULL; | |
1199 | finish_wait(&waiting, &wait); | |
1200 | ppb = dev->base = dev->dev->port->base; | |
1201 | dev->base_hi = dev->dev->port->base_hi; | |
1202 | w_ctr(ppb, 0x0c); | |
1203 | modes = dev->dev->port->modes; | |
1204 | ||
1205 | /* Mode detection works up the chain of speed | |
1206 | * This avoids a nasty if-then-else-if-... tree | |
1207 | */ | |
1208 | dev->mode = IMM_NIBBLE; | |
1209 | ||
1210 | if (modes & PARPORT_MODE_TRISTATE) | |
1211 | dev->mode = IMM_PS2; | |
1212 | ||
1213 | /* Done configuration */ | |
1214 | ||
1215 | err = imm_init(dev); | |
1216 | ||
1217 | imm_pb_release(dev); | |
1218 | ||
1219 | if (err) | |
1220 | goto out1; | |
1221 | ||
1222 | /* now the glue ... */ | |
1223 | if (dev->mode == IMM_NIBBLE || dev->mode == IMM_PS2) | |
1224 | ports = 3; | |
1225 | else | |
1226 | ports = 8; | |
1227 | ||
c4028958 | 1228 | INIT_DELAYED_WORK(&dev->imm_tq, imm_interrupt); |
1da177e4 LT |
1229 | |
1230 | err = -ENOMEM; | |
1231 | host = scsi_host_alloc(&imm_template, sizeof(imm_struct *)); | |
1232 | if (!host) | |
1233 | goto out1; | |
1234 | host->io_port = pb->base; | |
1235 | host->n_io_port = ports; | |
1236 | host->dma_channel = -1; | |
1237 | host->unique_id = pb->number; | |
1238 | *(imm_struct **)&host->hostdata = dev; | |
1239 | dev->host = host; | |
a290dd57 SM |
1240 | if (!temp) |
1241 | list_add_tail(&dev->list, &imm_hosts); | |
1242 | else | |
1243 | list_add_tail(&dev->list, &temp->list); | |
1da177e4 LT |
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 = { | |
a290dd57 SM |
1281 | .name = "imm", |
1282 | .match_port = imm_attach, | |
1283 | .detach = imm_detach, | |
1284 | .devmodel = true, | |
1da177e4 | 1285 | }; |
0e025183 | 1286 | module_parport_driver(imm_driver); |
1da177e4 LT |
1287 | |
1288 | MODULE_LICENSE("GPL"); |