1 | // SPDX-License-Identifier: GPL-2.0-only |
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 | * |
7 | * My unofficial company acronym list is 21 pages long: |
8 | * FLA: Four letter acronym with built in facility for |
9 | * future expansion to five letters. |
10 | */ |
11 | |
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> |
18 | #include <linux/delay.h> |
19 | #include <linux/slab.h> |
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 */ |
41 | struct delayed_work imm_tq; /* Polling interrupt stuff */ |
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 */ |
47 | unsigned int dev_no; /* Device number */ |
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, bool autodetect); |
55 | |
56 | #include "imm.h" |
57 | |
58 | static unsigned int mode = IMM_AUTODETECT; |
59 | module_param(mode, uint, 0644); |
60 | MODULE_PARM_DESC(mode, "Transfer mode (0 = Autodetect, 1 = SPP 4-bit, " |
61 | "2 = SPP 8-bit, 3 = EPP 8-bit, 4 = EPP 16-bit, 5 = EPP 32-bit" ); |
62 | |
63 | static inline imm_struct *imm_dev(struct Scsi_Host *host) |
64 | { |
65 | return *(imm_struct **)&host->hostdata; |
66 | } |
67 | |
68 | static DEFINE_SPINLOCK(arbitration_lock); |
69 | |
70 | static void got_it(imm_struct *dev) |
71 | { |
72 | dev->base = dev->dev->port->base; |
73 | if (dev->cur_cmd) |
74 | imm_scsi_pointer(cmd: dev->cur_cmd)->phase = 1; |
75 | else |
76 | wake_up(dev->waiting); |
77 | } |
78 | |
79 | static void imm_wakeup(void *ref) |
80 | { |
81 | imm_struct *dev = (imm_struct *) ref; |
82 | unsigned long flags; |
83 | |
84 | spin_lock_irqsave(&arbitration_lock, flags); |
85 | if (dev->wanted) { |
86 | if (parport_claim(dev: dev->dev) == 0) { |
87 | got_it(dev); |
88 | dev->wanted = 0; |
89 | } |
90 | } |
91 | spin_unlock_irqrestore(lock: &arbitration_lock, flags); |
92 | } |
93 | |
94 | static int imm_pb_claim(imm_struct *dev) |
95 | { |
96 | unsigned long flags; |
97 | int res = 1; |
98 | spin_lock_irqsave(&arbitration_lock, flags); |
99 | if (parport_claim(dev: dev->dev) == 0) { |
100 | got_it(dev); |
101 | res = 0; |
102 | } |
103 | dev->wanted = res; |
104 | spin_unlock_irqrestore(lock: &arbitration_lock, flags); |
105 | return res; |
106 | } |
107 | |
108 | static void imm_pb_dismiss(imm_struct *dev) |
109 | { |
110 | unsigned long flags; |
111 | int wanted; |
112 | spin_lock_irqsave(&arbitration_lock, flags); |
113 | wanted = dev->wanted; |
114 | dev->wanted = 0; |
115 | spin_unlock_irqrestore(lock: &arbitration_lock, flags); |
116 | if (!wanted) |
117 | parport_release(dev: dev->dev); |
118 | } |
119 | |
120 | static inline void imm_pb_release(imm_struct *dev) |
121 | { |
122 | parport_release(dev: dev->dev); |
123 | } |
124 | |
125 | /* This is to give the imm driver a way to modify the timings (and other |
126 | * parameters) by writing to the /proc/scsi/imm/0 file. |
127 | * Very simple method really... (Too simple, no error checking :( ) |
128 | * Reason: Kernel hackers HATE having to unload and reload modules for |
129 | * testing... |
130 | * Also gives a method to use a script to obtain optimum timings (TODO) |
131 | */ |
132 | static int imm_write_info(struct Scsi_Host *host, char *buffer, int length) |
133 | { |
134 | imm_struct *dev = imm_dev(host); |
135 | |
136 | if ((length > 5) && (strncmp(buffer, "mode=" , 5) == 0)) { |
137 | dev->mode = simple_strtoul(buffer + 5, NULL, 0); |
138 | return length; |
139 | } |
140 | printk("imm /proc: invalid variable\n" ); |
141 | return -EINVAL; |
142 | } |
143 | |
144 | static int imm_show_info(struct seq_file *m, struct Scsi_Host *host) |
145 | { |
146 | imm_struct *dev = imm_dev(host); |
147 | |
148 | seq_printf(m, fmt: "Version : %s\n" , IMM_VERSION); |
149 | seq_printf(m, fmt: "Parport : %s\n" , dev->dev->port->name); |
150 | seq_printf(m, fmt: "Mode : %s\n" , IMM_MODE_STRING[dev->mode]); |
151 | return 0; |
152 | } |
153 | |
154 | #if IMM_DEBUG > 0 |
155 | #define imm_fail(x,y) printk("imm: imm_fail(%i) from %s at line %d\n",\ |
156 | y, __func__, __LINE__); imm_fail_func(x,y); |
157 | static inline void |
158 | imm_fail_func(imm_struct *dev, int error_code) |
159 | #else |
160 | static inline void |
161 | imm_fail(imm_struct *dev, int error_code) |
162 | #endif |
163 | { |
164 | /* If we fail a device then we trash status / message bytes */ |
165 | if (dev->cur_cmd) { |
166 | dev->cur_cmd->result = error_code << 16; |
167 | dev->failed = 1; |
168 | } |
169 | } |
170 | |
171 | /* |
172 | * Wait for the high bit to be set. |
173 | * |
174 | * In principle, this could be tied to an interrupt, but the adapter |
175 | * doesn't appear to be designed to support interrupts. We spin on |
176 | * the 0x80 ready bit. |
177 | */ |
178 | static unsigned char imm_wait(imm_struct *dev) |
179 | { |
180 | int k; |
181 | unsigned short ppb = dev->base; |
182 | unsigned char r; |
183 | |
184 | w_ctr(ppb, 0x0c); |
185 | |
186 | k = IMM_SPIN_TMO; |
187 | do { |
188 | r = r_str(ppb); |
189 | k--; |
190 | udelay(1); |
191 | } |
192 | while (!(r & 0x80) && (k)); |
193 | |
194 | /* |
195 | * STR register (LPT base+1) to SCSI mapping: |
196 | * |
197 | * STR imm imm |
198 | * =================================== |
199 | * 0x80 S_REQ S_REQ |
200 | * 0x40 !S_BSY (????) |
201 | * 0x20 !S_CD !S_CD |
202 | * 0x10 !S_IO !S_IO |
203 | * 0x08 (????) !S_BSY |
204 | * |
205 | * imm imm meaning |
206 | * ================================== |
207 | * 0xf0 0xb8 Bit mask |
208 | * 0xc0 0x88 ZIP wants more data |
209 | * 0xd0 0x98 ZIP wants to send more data |
210 | * 0xe0 0xa8 ZIP is expecting SCSI command data |
211 | * 0xf0 0xb8 end of transfer, ZIP is sending status |
212 | */ |
213 | w_ctr(ppb, 0x04); |
214 | if (k) |
215 | return (r & 0xb8); |
216 | |
217 | /* Counter expired - Time out occurred */ |
218 | imm_fail(dev, error_code: DID_TIME_OUT); |
219 | printk("imm timeout in imm_wait\n" ); |
220 | return 0; /* command timed out */ |
221 | } |
222 | |
223 | static int imm_negotiate(imm_struct * tmp) |
224 | { |
225 | /* |
226 | * The following is supposedly the IEEE 1284-1994 negotiate |
227 | * sequence. I have yet to obtain a copy of the above standard |
228 | * so this is a bit of a guess... |
229 | * |
230 | * A fair chunk of this is based on the Linux parport implementation |
231 | * of IEEE 1284. |
232 | * |
233 | * Return 0 if data available |
234 | * 1 if no data available |
235 | */ |
236 | |
237 | unsigned short base = tmp->base; |
238 | unsigned char a, mode; |
239 | |
240 | switch (tmp->mode) { |
241 | case IMM_NIBBLE: |
242 | mode = 0x00; |
243 | break; |
244 | case IMM_PS2: |
245 | mode = 0x01; |
246 | break; |
247 | default: |
248 | return 0; |
249 | } |
250 | |
251 | w_ctr(base, 0x04); |
252 | udelay(5); |
253 | w_dtr(base, mode); |
254 | udelay(100); |
255 | w_ctr(base, 0x06); |
256 | udelay(5); |
257 | a = (r_str(base) & 0x20) ? 0 : 1; |
258 | udelay(5); |
259 | w_ctr(base, 0x07); |
260 | udelay(5); |
261 | w_ctr(base, 0x06); |
262 | |
263 | if (a) { |
264 | printk |
265 | ("IMM: IEEE1284 negotiate indicates no data available.\n" ); |
266 | imm_fail(dev: tmp, error_code: DID_ERROR); |
267 | } |
268 | return a; |
269 | } |
270 | |
271 | /* |
272 | * Clear EPP timeout bit. |
273 | */ |
274 | static inline void epp_reset(unsigned short ppb) |
275 | { |
276 | int i; |
277 | |
278 | i = r_str(ppb); |
279 | w_str(ppb, i); |
280 | w_str(ppb, i & 0xfe); |
281 | } |
282 | |
283 | /* |
284 | * Wait for empty ECP fifo (if we are in ECP fifo mode only) |
285 | */ |
286 | static inline void ecp_sync(imm_struct *dev) |
287 | { |
288 | int i, ppb_hi = dev->base_hi; |
289 | |
290 | if (ppb_hi == 0) |
291 | return; |
292 | |
293 | if ((r_ecr(ppb_hi) & 0xe0) == 0x60) { /* mode 011 == ECP fifo mode */ |
294 | for (i = 0; i < 100; i++) { |
295 | if (r_ecr(ppb_hi) & 0x01) |
296 | return; |
297 | udelay(5); |
298 | } |
299 | printk("imm: ECP sync failed as data still present in FIFO.\n" ); |
300 | } |
301 | } |
302 | |
303 | static int imm_byte_out(unsigned short base, const char *buffer, int len) |
304 | { |
305 | int i; |
306 | |
307 | w_ctr(base, 0x4); /* apparently a sane mode */ |
308 | for (i = len >> 1; i; i--) { |
309 | w_dtr(base, *buffer++); |
310 | w_ctr(base, 0x5); /* Drop STROBE low */ |
311 | w_dtr(base, *buffer++); |
312 | w_ctr(base, 0x0); /* STROBE high + INIT low */ |
313 | } |
314 | w_ctr(base, 0x4); /* apparently a sane mode */ |
315 | return 1; /* All went well - we hope! */ |
316 | } |
317 | |
318 | static int imm_nibble_in(unsigned short base, char *buffer, int len) |
319 | { |
320 | unsigned char l; |
321 | int i; |
322 | |
323 | /* |
324 | * The following is based on documented timing signals |
325 | */ |
326 | w_ctr(base, 0x4); |
327 | for (i = len; i; i--) { |
328 | w_ctr(base, 0x6); |
329 | l = (r_str(base) & 0xf0) >> 4; |
330 | w_ctr(base, 0x5); |
331 | *buffer++ = (r_str(base) & 0xf0) | l; |
332 | w_ctr(base, 0x4); |
333 | } |
334 | return 1; /* All went well - we hope! */ |
335 | } |
336 | |
337 | static int imm_byte_in(unsigned short base, char *buffer, int len) |
338 | { |
339 | int i; |
340 | |
341 | /* |
342 | * The following is based on documented timing signals |
343 | */ |
344 | w_ctr(base, 0x4); |
345 | for (i = len; i; i--) { |
346 | w_ctr(base, 0x26); |
347 | *buffer++ = r_dtr(base); |
348 | w_ctr(base, 0x25); |
349 | } |
350 | return 1; /* All went well - we hope! */ |
351 | } |
352 | |
353 | static int imm_out(imm_struct *dev, char *buffer, int len) |
354 | { |
355 | unsigned short ppb = dev->base; |
356 | int r = imm_wait(dev); |
357 | |
358 | /* |
359 | * Make sure that: |
360 | * a) the SCSI bus is BUSY (device still listening) |
361 | * b) the device is listening |
362 | */ |
363 | if ((r & 0x18) != 0x08) { |
364 | imm_fail(dev, error_code: DID_ERROR); |
365 | printk("IMM: returned SCSI status %2x\n" , r); |
366 | return 0; |
367 | } |
368 | switch (dev->mode) { |
369 | case IMM_EPP_32: |
370 | case IMM_EPP_16: |
371 | case IMM_EPP_8: |
372 | epp_reset(ppb); |
373 | w_ctr(ppb, 0x4); |
374 | if (dev->mode == IMM_EPP_32 && !(((long) buffer | len) & 0x03)) |
375 | outsl(port: ppb + 4, addr: buffer, count: len >> 2); |
376 | else if (dev->mode == IMM_EPP_16 && !(((long) buffer | len) & 0x01)) |
377 | outsw(port: ppb + 4, addr: buffer, count: len >> 1); |
378 | else |
379 | outsb(port: ppb + 4, addr: buffer, count: len); |
380 | w_ctr(ppb, 0xc); |
381 | r = !(r_str(ppb) & 0x01); |
382 | w_ctr(ppb, 0xc); |
383 | ecp_sync(dev); |
384 | break; |
385 | |
386 | case IMM_NIBBLE: |
387 | case IMM_PS2: |
388 | /* 8 bit output, with a loop */ |
389 | r = imm_byte_out(base: ppb, buffer, len); |
390 | break; |
391 | |
392 | default: |
393 | printk("IMM: bug in imm_out()\n" ); |
394 | r = 0; |
395 | } |
396 | return r; |
397 | } |
398 | |
399 | static int imm_in(imm_struct *dev, char *buffer, int len) |
400 | { |
401 | unsigned short ppb = dev->base; |
402 | int r = imm_wait(dev); |
403 | |
404 | /* |
405 | * Make sure that: |
406 | * a) the SCSI bus is BUSY (device still listening) |
407 | * b) the device is sending data |
408 | */ |
409 | if ((r & 0x18) != 0x18) { |
410 | imm_fail(dev, error_code: DID_ERROR); |
411 | return 0; |
412 | } |
413 | switch (dev->mode) { |
414 | case IMM_NIBBLE: |
415 | /* 4 bit input, with a loop */ |
416 | r = imm_nibble_in(base: ppb, buffer, len); |
417 | w_ctr(ppb, 0xc); |
418 | break; |
419 | |
420 | case IMM_PS2: |
421 | /* 8 bit input, with a loop */ |
422 | r = imm_byte_in(base: ppb, buffer, len); |
423 | w_ctr(ppb, 0xc); |
424 | break; |
425 | |
426 | case IMM_EPP_32: |
427 | case IMM_EPP_16: |
428 | case IMM_EPP_8: |
429 | epp_reset(ppb); |
430 | w_ctr(ppb, 0x24); |
431 | if (dev->mode == IMM_EPP_32 && !(((long) buffer | len) & 0x03)) |
432 | insw(port: ppb + 4, addr: buffer, count: len >> 2); |
433 | else if (dev->mode == IMM_EPP_16 && !(((long) buffer | len) & 0x01)) |
434 | insl(port: ppb + 4, addr: buffer, count: len >> 1); |
435 | else |
436 | insb(port: ppb + 4, addr: buffer, count: len); |
437 | w_ctr(ppb, 0x2c); |
438 | r = !(r_str(ppb) & 0x01); |
439 | w_ctr(ppb, 0x2c); |
440 | ecp_sync(dev); |
441 | break; |
442 | |
443 | default: |
444 | printk("IMM: bug in imm_ins()\n" ); |
445 | r = 0; |
446 | break; |
447 | } |
448 | return r; |
449 | } |
450 | |
451 | static int imm_cpp(unsigned short ppb, unsigned char b) |
452 | { |
453 | /* |
454 | * Comments on udelay values refer to the |
455 | * Command Packet Protocol (CPP) timing diagram. |
456 | */ |
457 | |
458 | unsigned char s1, s2, s3; |
459 | w_ctr(ppb, 0x0c); |
460 | udelay(2); /* 1 usec - infinite */ |
461 | w_dtr(ppb, 0xaa); |
462 | udelay(10); /* 7 usec - infinite */ |
463 | w_dtr(ppb, 0x55); |
464 | udelay(10); /* 7 usec - infinite */ |
465 | w_dtr(ppb, 0x00); |
466 | udelay(10); /* 7 usec - infinite */ |
467 | w_dtr(ppb, 0xff); |
468 | udelay(10); /* 7 usec - infinite */ |
469 | s1 = r_str(ppb) & 0xb8; |
470 | w_dtr(ppb, 0x87); |
471 | udelay(10); /* 7 usec - infinite */ |
472 | s2 = r_str(ppb) & 0xb8; |
473 | w_dtr(ppb, 0x78); |
474 | udelay(10); /* 7 usec - infinite */ |
475 | s3 = r_str(ppb) & 0x38; |
476 | /* |
477 | * Values for b are: |
478 | * 0000 00aa Assign address aa to current device |
479 | * 0010 00aa Select device aa in EPP Winbond mode |
480 | * 0010 10aa Select device aa in EPP mode |
481 | * 0011 xxxx Deselect all devices |
482 | * 0110 00aa Test device aa |
483 | * 1101 00aa Select device aa in ECP mode |
484 | * 1110 00aa Select device aa in Compatible mode |
485 | */ |
486 | w_dtr(ppb, b); |
487 | udelay(2); /* 1 usec - infinite */ |
488 | w_ctr(ppb, 0x0c); |
489 | udelay(10); /* 7 usec - infinite */ |
490 | w_ctr(ppb, 0x0d); |
491 | udelay(2); /* 1 usec - infinite */ |
492 | w_ctr(ppb, 0x0c); |
493 | udelay(10); /* 7 usec - infinite */ |
494 | w_dtr(ppb, 0xff); |
495 | udelay(10); /* 7 usec - infinite */ |
496 | |
497 | /* |
498 | * The following table is electrical pin values. |
499 | * (BSY is inverted at the CTR register) |
500 | * |
501 | * BSY ACK POut SEL Fault |
502 | * S1 0 X 1 1 1 |
503 | * S2 1 X 0 1 1 |
504 | * S3 L X 1 1 S |
505 | * |
506 | * L => Last device in chain |
507 | * S => Selected |
508 | * |
509 | * Observered values for S1,S2,S3 are: |
510 | * Disconnect => f8/58/78 |
511 | * Connect => f8/58/70 |
512 | */ |
513 | if ((s1 == 0xb8) && (s2 == 0x18) && (s3 == 0x30)) |
514 | return 1; /* Connected */ |
515 | if ((s1 == 0xb8) && (s2 == 0x18) && (s3 == 0x38)) |
516 | return 0; /* Disconnected */ |
517 | |
518 | return -1; /* No device present */ |
519 | } |
520 | |
521 | static inline int imm_connect(imm_struct *dev, int flag) |
522 | { |
523 | unsigned short ppb = dev->base; |
524 | |
525 | imm_cpp(ppb, b: 0xe0); /* Select device 0 in compatible mode */ |
526 | imm_cpp(ppb, b: 0x30); /* Disconnect all devices */ |
527 | |
528 | if ((dev->mode == IMM_EPP_8) || |
529 | (dev->mode == IMM_EPP_16) || |
530 | (dev->mode == IMM_EPP_32)) |
531 | return imm_cpp(ppb, b: 0x28); /* Select device 0 in EPP mode */ |
532 | return imm_cpp(ppb, b: 0xe0); /* Select device 0 in compatible mode */ |
533 | } |
534 | |
535 | static void imm_disconnect(imm_struct *dev) |
536 | { |
537 | imm_cpp(ppb: dev->base, b: 0x30); /* Disconnect all devices */ |
538 | } |
539 | |
540 | static int imm_select(imm_struct *dev, int target) |
541 | { |
542 | int k; |
543 | unsigned short ppb = dev->base; |
544 | |
545 | /* |
546 | * Firstly we want to make sure there is nothing |
547 | * holding onto the SCSI bus. |
548 | */ |
549 | w_ctr(ppb, 0xc); |
550 | |
551 | k = IMM_SELECT_TMO; |
552 | do { |
553 | k--; |
554 | } while ((r_str(ppb) & 0x08) && (k)); |
555 | |
556 | if (!k) |
557 | return 0; |
558 | |
559 | /* |
560 | * Now assert the SCSI ID (HOST and TARGET) on the data bus |
561 | */ |
562 | w_ctr(ppb, 0x4); |
563 | w_dtr(ppb, 0x80 | (1 << target)); |
564 | udelay(1); |
565 | |
566 | /* |
567 | * Deassert SELIN first followed by STROBE |
568 | */ |
569 | w_ctr(ppb, 0xc); |
570 | w_ctr(ppb, 0xd); |
571 | |
572 | /* |
573 | * ACK should drop low while SELIN is deasserted. |
574 | * FAULT should drop low when the SCSI device latches the bus. |
575 | */ |
576 | k = IMM_SELECT_TMO; |
577 | do { |
578 | k--; |
579 | } |
580 | while (!(r_str(ppb) & 0x08) && (k)); |
581 | |
582 | /* |
583 | * Place the interface back into a sane state (status mode) |
584 | */ |
585 | w_ctr(ppb, 0xc); |
586 | return (k) ? 1 : 0; |
587 | } |
588 | |
589 | static int imm_init(imm_struct *dev) |
590 | { |
591 | bool autodetect = dev->mode == IMM_AUTODETECT; |
592 | |
593 | if (autodetect) { |
594 | int modes = dev->dev->port->modes; |
595 | |
596 | /* Mode detection works up the chain of speed |
597 | * This avoids a nasty if-then-else-if-... tree |
598 | */ |
599 | dev->mode = IMM_NIBBLE; |
600 | |
601 | if (modes & PARPORT_MODE_TRISTATE) |
602 | dev->mode = IMM_PS2; |
603 | } |
604 | |
605 | if (imm_connect(dev, flag: 0) != 1) |
606 | return -EIO; |
607 | imm_reset_pulse(base: dev->base); |
608 | mdelay(1); /* Delay to allow devices to settle */ |
609 | imm_disconnect(dev); |
610 | mdelay(1); /* Another delay to allow devices to settle */ |
611 | |
612 | return device_check(dev, autodetect); |
613 | } |
614 | |
615 | static inline int imm_send_command(struct scsi_cmnd *cmd) |
616 | { |
617 | imm_struct *dev = imm_dev(host: cmd->device->host); |
618 | int k; |
619 | |
620 | /* NOTE: IMM uses byte pairs */ |
621 | for (k = 0; k < cmd->cmd_len; k += 2) |
622 | if (!imm_out(dev, buffer: &cmd->cmnd[k], len: 2)) |
623 | return 0; |
624 | return 1; |
625 | } |
626 | |
627 | /* |
628 | * The bulk flag enables some optimisations in the data transfer loops, |
629 | * it should be true for any command that transfers data in integral |
630 | * numbers of sectors. |
631 | * |
632 | * The driver appears to remain stable if we speed up the parallel port |
633 | * i/o in this function, but not elsewhere. |
634 | */ |
635 | static int imm_completion(struct scsi_cmnd *const cmd) |
636 | { |
637 | /* Return codes: |
638 | * -1 Error |
639 | * 0 Told to schedule |
640 | * 1 Finished data transfer |
641 | */ |
642 | struct scsi_pointer *scsi_pointer = imm_scsi_pointer(cmd); |
643 | imm_struct *dev = imm_dev(host: cmd->device->host); |
644 | unsigned short ppb = dev->base; |
645 | unsigned long start_jiffies = jiffies; |
646 | |
647 | unsigned char r, v; |
648 | int fast, bulk, status; |
649 | |
650 | v = cmd->cmnd[0]; |
651 | bulk = ((v == READ_6) || |
652 | (v == READ_10) || (v == WRITE_6) || (v == WRITE_10)); |
653 | |
654 | /* |
655 | * We only get here if the drive is ready to comunicate, |
656 | * hence no need for a full imm_wait. |
657 | */ |
658 | w_ctr(ppb, 0x0c); |
659 | r = (r_str(ppb) & 0xb8); |
660 | |
661 | /* |
662 | * while (device is not ready to send status byte) |
663 | * loop; |
664 | */ |
665 | while (r != (unsigned char) 0xb8) { |
666 | /* |
667 | * If we have been running for more than a full timer tick |
668 | * then take a rest. |
669 | */ |
670 | if (time_after(jiffies, start_jiffies + 1)) |
671 | return 0; |
672 | |
673 | /* |
674 | * FAIL if: |
675 | * a) Drive status is screwy (!ready && !present) |
676 | * b) Drive is requesting/sending more data than expected |
677 | */ |
678 | if ((r & 0x88) != 0x88 || scsi_pointer->this_residual <= 0) { |
679 | imm_fail(dev, error_code: DID_ERROR); |
680 | return -1; /* ERROR_RETURN */ |
681 | } |
682 | /* determine if we should use burst I/O */ |
683 | if (dev->rd == 0) { |
684 | fast = bulk && scsi_pointer->this_residual >= |
685 | IMM_BURST_SIZE ? IMM_BURST_SIZE : 2; |
686 | status = imm_out(dev, buffer: scsi_pointer->ptr, len: fast); |
687 | } else { |
688 | fast = bulk && scsi_pointer->this_residual >= |
689 | IMM_BURST_SIZE ? IMM_BURST_SIZE : 1; |
690 | status = imm_in(dev, buffer: scsi_pointer->ptr, len: fast); |
691 | } |
692 | |
693 | scsi_pointer->ptr += fast; |
694 | scsi_pointer->this_residual -= fast; |
695 | |
696 | if (!status) { |
697 | imm_fail(dev, error_code: DID_BUS_BUSY); |
698 | return -1; /* ERROR_RETURN */ |
699 | } |
700 | if (scsi_pointer->buffer && !scsi_pointer->this_residual) { |
701 | /* if scatter/gather, advance to the next segment */ |
702 | if (scsi_pointer->buffers_residual--) { |
703 | scsi_pointer->buffer = |
704 | sg_next(scsi_pointer->buffer); |
705 | scsi_pointer->this_residual = |
706 | scsi_pointer->buffer->length; |
707 | scsi_pointer->ptr = sg_virt(sg: scsi_pointer->buffer); |
708 | |
709 | /* |
710 | * Make sure that we transfer even number of bytes |
711 | * otherwise it makes imm_byte_out() messy. |
712 | */ |
713 | if (scsi_pointer->this_residual & 0x01) |
714 | scsi_pointer->this_residual++; |
715 | } |
716 | } |
717 | /* Now check to see if the drive is ready to comunicate */ |
718 | w_ctr(ppb, 0x0c); |
719 | r = (r_str(ppb) & 0xb8); |
720 | |
721 | /* If not, drop back down to the scheduler and wait a timer tick */ |
722 | if (!(r & 0x80)) |
723 | return 0; |
724 | } |
725 | return 1; /* FINISH_RETURN */ |
726 | } |
727 | |
728 | /* |
729 | * Since the IMM itself doesn't generate interrupts, we use |
730 | * the scheduler's task queue to generate a stream of call-backs and |
731 | * complete the request when the drive is ready. |
732 | */ |
733 | static void imm_interrupt(struct work_struct *work) |
734 | { |
735 | imm_struct *dev = container_of(work, imm_struct, imm_tq.work); |
736 | struct scsi_cmnd *cmd = dev->cur_cmd; |
737 | struct Scsi_Host *host = cmd->device->host; |
738 | unsigned long flags; |
739 | |
740 | if (imm_engine(dev, cmd)) { |
741 | schedule_delayed_work(dwork: &dev->imm_tq, delay: 1); |
742 | return; |
743 | } |
744 | /* Command must of completed hence it is safe to let go... */ |
745 | #if IMM_DEBUG > 0 |
746 | switch ((cmd->result >> 16) & 0xff) { |
747 | case DID_OK: |
748 | break; |
749 | case DID_NO_CONNECT: |
750 | printk("imm: no device at SCSI ID %i\n" , cmd->device->id); |
751 | break; |
752 | case DID_BUS_BUSY: |
753 | printk("imm: BUS BUSY - EPP timeout detected\n" ); |
754 | break; |
755 | case DID_TIME_OUT: |
756 | printk("imm: unknown timeout\n" ); |
757 | break; |
758 | case DID_ABORT: |
759 | printk("imm: told to abort\n" ); |
760 | break; |
761 | case DID_PARITY: |
762 | printk("imm: parity error (???)\n" ); |
763 | break; |
764 | case DID_ERROR: |
765 | printk("imm: internal driver error\n" ); |
766 | break; |
767 | case DID_RESET: |
768 | printk("imm: told to reset device\n" ); |
769 | break; |
770 | case DID_BAD_INTR: |
771 | printk("imm: bad interrupt (???)\n" ); |
772 | break; |
773 | default: |
774 | printk("imm: bad return code (%02x)\n" , |
775 | (cmd->result >> 16) & 0xff); |
776 | } |
777 | #endif |
778 | |
779 | if (imm_scsi_pointer(cmd)->phase > 1) |
780 | imm_disconnect(dev); |
781 | |
782 | imm_pb_dismiss(dev); |
783 | |
784 | spin_lock_irqsave(host->host_lock, flags); |
785 | dev->cur_cmd = NULL; |
786 | scsi_done(cmd); |
787 | spin_unlock_irqrestore(lock: host->host_lock, flags); |
788 | return; |
789 | } |
790 | |
791 | static int imm_engine(imm_struct *dev, struct scsi_cmnd *const cmd) |
792 | { |
793 | struct scsi_pointer *scsi_pointer = imm_scsi_pointer(cmd); |
794 | unsigned short ppb = dev->base; |
795 | unsigned char l = 0, h = 0; |
796 | int retv, x; |
797 | |
798 | /* First check for any errors that may have occurred |
799 | * Here we check for internal errors |
800 | */ |
801 | if (dev->failed) |
802 | return 0; |
803 | |
804 | switch (scsi_pointer->phase) { |
805 | case 0: /* Phase 0 - Waiting for parport */ |
806 | if (time_after(jiffies, dev->jstart + HZ)) { |
807 | /* |
808 | * We waited more than a second |
809 | * for parport to call us |
810 | */ |
811 | imm_fail(dev, error_code: DID_BUS_BUSY); |
812 | return 0; |
813 | } |
814 | return 1; /* wait until imm_wakeup claims parport */ |
815 | |
816 | case 1: /* Phase 1 - Connected */ |
817 | imm_connect(dev, CONNECT_EPP_MAYBE); |
818 | scsi_pointer->phase++; |
819 | fallthrough; |
820 | |
821 | case 2: /* Phase 2 - We are now talking to the scsi bus */ |
822 | if (!imm_select(dev, scmd_id(cmd))) { |
823 | imm_fail(dev, error_code: DID_NO_CONNECT); |
824 | return 0; |
825 | } |
826 | scsi_pointer->phase++; |
827 | fallthrough; |
828 | |
829 | case 3: /* Phase 3 - Ready to accept a command */ |
830 | w_ctr(ppb, 0x0c); |
831 | if (!(r_str(ppb) & 0x80)) |
832 | return 1; |
833 | |
834 | if (!imm_send_command(cmd)) |
835 | return 0; |
836 | scsi_pointer->phase++; |
837 | fallthrough; |
838 | |
839 | case 4: /* Phase 4 - Setup scatter/gather buffers */ |
840 | if (scsi_bufflen(cmd)) { |
841 | scsi_pointer->buffer = scsi_sglist(cmd); |
842 | scsi_pointer->this_residual = scsi_pointer->buffer->length; |
843 | scsi_pointer->ptr = sg_virt(sg: scsi_pointer->buffer); |
844 | } else { |
845 | scsi_pointer->buffer = NULL; |
846 | scsi_pointer->this_residual = 0; |
847 | scsi_pointer->ptr = NULL; |
848 | } |
849 | scsi_pointer->buffers_residual = scsi_sg_count(cmd) - 1; |
850 | scsi_pointer->phase++; |
851 | if (scsi_pointer->this_residual & 0x01) |
852 | scsi_pointer->this_residual++; |
853 | fallthrough; |
854 | |
855 | case 5: /* Phase 5 - Pre-Data transfer stage */ |
856 | /* Spin lock for BUSY */ |
857 | w_ctr(ppb, 0x0c); |
858 | if (!(r_str(ppb) & 0x80)) |
859 | return 1; |
860 | |
861 | /* Require negotiation for read requests */ |
862 | x = (r_str(ppb) & 0xb8); |
863 | dev->rd = (x & 0x10) ? 1 : 0; |
864 | dev->dp = (x & 0x20) ? 0 : 1; |
865 | |
866 | if ((dev->dp) && (dev->rd)) |
867 | if (imm_negotiate(tmp: dev)) |
868 | return 0; |
869 | scsi_pointer->phase++; |
870 | fallthrough; |
871 | |
872 | case 6: /* Phase 6 - Data transfer stage */ |
873 | /* Spin lock for BUSY */ |
874 | w_ctr(ppb, 0x0c); |
875 | if (!(r_str(ppb) & 0x80)) |
876 | return 1; |
877 | |
878 | if (dev->dp) { |
879 | retv = imm_completion(cmd); |
880 | if (retv == -1) |
881 | return 0; |
882 | if (retv == 0) |
883 | return 1; |
884 | } |
885 | scsi_pointer->phase++; |
886 | fallthrough; |
887 | |
888 | case 7: /* Phase 7 - Post data transfer stage */ |
889 | if ((dev->dp) && (dev->rd)) { |
890 | if ((dev->mode == IMM_NIBBLE) || (dev->mode == IMM_PS2)) { |
891 | w_ctr(ppb, 0x4); |
892 | w_ctr(ppb, 0xc); |
893 | w_ctr(ppb, 0xe); |
894 | w_ctr(ppb, 0x4); |
895 | } |
896 | } |
897 | scsi_pointer->phase++; |
898 | fallthrough; |
899 | |
900 | case 8: /* Phase 8 - Read status/message */ |
901 | /* Check for data overrun */ |
902 | if (imm_wait(dev) != (unsigned char) 0xb8) { |
903 | imm_fail(dev, error_code: DID_ERROR); |
904 | return 0; |
905 | } |
906 | if (imm_negotiate(tmp: dev)) |
907 | return 0; |
908 | if (imm_in(dev, buffer: &l, len: 1)) { /* read status byte */ |
909 | /* Check for optional message byte */ |
910 | if (imm_wait(dev) == (unsigned char) 0xb8) |
911 | imm_in(dev, buffer: &h, len: 1); |
912 | cmd->result = (DID_OK << 16) | (l & STATUS_MASK); |
913 | } |
914 | if ((dev->mode == IMM_NIBBLE) || (dev->mode == IMM_PS2)) { |
915 | w_ctr(ppb, 0x4); |
916 | w_ctr(ppb, 0xc); |
917 | w_ctr(ppb, 0xe); |
918 | w_ctr(ppb, 0x4); |
919 | } |
920 | return 0; /* Finished */ |
921 | |
922 | default: |
923 | printk("imm: Invalid scsi phase\n" ); |
924 | } |
925 | return 0; |
926 | } |
927 | |
928 | static int imm_queuecommand_lck(struct scsi_cmnd *cmd) |
929 | { |
930 | imm_struct *dev = imm_dev(host: cmd->device->host); |
931 | |
932 | if (dev->cur_cmd) { |
933 | printk("IMM: bug in imm_queuecommand\n" ); |
934 | return 0; |
935 | } |
936 | dev->failed = 0; |
937 | dev->jstart = jiffies; |
938 | dev->cur_cmd = cmd; |
939 | cmd->result = DID_ERROR << 16; /* default return code */ |
940 | imm_scsi_pointer(cmd)->phase = 0; /* bus free */ |
941 | |
942 | schedule_delayed_work(dwork: &dev->imm_tq, delay: 0); |
943 | |
944 | imm_pb_claim(dev); |
945 | |
946 | return 0; |
947 | } |
948 | |
949 | static DEF_SCSI_QCMD(imm_queuecommand) |
950 | |
951 | /* |
952 | * Apparently the disk->capacity attribute is off by 1 sector |
953 | * for all disk drives. We add the one here, but it should really |
954 | * be done in sd.c. Even if it gets fixed there, this will still |
955 | * work. |
956 | */ |
957 | static int imm_biosparam(struct scsi_device *sdev, struct block_device *dev, |
958 | sector_t capacity, int ip[]) |
959 | { |
960 | ip[0] = 0x40; |
961 | ip[1] = 0x20; |
962 | ip[2] = ((unsigned long) capacity + 1) / (ip[0] * ip[1]); |
963 | if (ip[2] > 1024) { |
964 | ip[0] = 0xff; |
965 | ip[1] = 0x3f; |
966 | ip[2] = ((unsigned long) capacity + 1) / (ip[0] * ip[1]); |
967 | } |
968 | return 0; |
969 | } |
970 | |
971 | static int imm_abort(struct scsi_cmnd *cmd) |
972 | { |
973 | imm_struct *dev = imm_dev(host: cmd->device->host); |
974 | /* |
975 | * There is no method for aborting commands since Iomega |
976 | * have tied the SCSI_MESSAGE line high in the interface |
977 | */ |
978 | |
979 | switch (imm_scsi_pointer(cmd)->phase) { |
980 | case 0: /* Do not have access to parport */ |
981 | case 1: /* Have not connected to interface */ |
982 | dev->cur_cmd = NULL; /* Forget the problem */ |
983 | return SUCCESS; |
984 | default: /* SCSI command sent, can not abort */ |
985 | return FAILED; |
986 | } |
987 | } |
988 | |
989 | static void imm_reset_pulse(unsigned int base) |
990 | { |
991 | w_ctr(base, 0x04); |
992 | w_dtr(base, 0x40); |
993 | udelay(1); |
994 | w_ctr(base, 0x0c); |
995 | w_ctr(base, 0x0d); |
996 | udelay(50); |
997 | w_ctr(base, 0x0c); |
998 | w_ctr(base, 0x04); |
999 | } |
1000 | |
1001 | static int imm_reset(struct scsi_cmnd *cmd) |
1002 | { |
1003 | imm_struct *dev = imm_dev(host: cmd->device->host); |
1004 | |
1005 | if (imm_scsi_pointer(cmd)->phase) |
1006 | imm_disconnect(dev); |
1007 | dev->cur_cmd = NULL; /* Forget the problem */ |
1008 | |
1009 | imm_connect(dev, CONNECT_NORMAL); |
1010 | imm_reset_pulse(base: dev->base); |
1011 | mdelay(1); /* device settle delay */ |
1012 | imm_disconnect(dev); |
1013 | mdelay(1); /* device settle delay */ |
1014 | return SUCCESS; |
1015 | } |
1016 | |
1017 | static int device_check(imm_struct *dev, bool autodetect) |
1018 | { |
1019 | /* This routine looks for a device and then attempts to use EPP |
1020 | to send a command. If all goes as planned then EPP is available. */ |
1021 | |
1022 | static char cmd[6] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }; |
1023 | int loop, old_mode, status, k, ppb = dev->base; |
1024 | unsigned char l; |
1025 | |
1026 | old_mode = dev->mode; |
1027 | for (loop = 0; loop < 8; loop++) { |
1028 | /* Attempt to use EPP for Test Unit Ready */ |
1029 | if (autodetect && (ppb & 0x0007) == 0x0000) |
1030 | dev->mode = IMM_EPP_8; |
1031 | |
1032 | second_pass: |
1033 | imm_connect(dev, CONNECT_EPP_MAYBE); |
1034 | /* Select SCSI device */ |
1035 | if (!imm_select(dev, target: loop)) { |
1036 | imm_disconnect(dev); |
1037 | continue; |
1038 | } |
1039 | printk("imm: Found device at ID %i, Attempting to use %s\n" , |
1040 | loop, IMM_MODE_STRING[dev->mode]); |
1041 | |
1042 | /* Send SCSI command */ |
1043 | status = 1; |
1044 | w_ctr(ppb, 0x0c); |
1045 | for (l = 0; (l < 3) && (status); l++) |
1046 | status = imm_out(dev, buffer: &cmd[l << 1], len: 2); |
1047 | |
1048 | if (!status) { |
1049 | imm_disconnect(dev); |
1050 | imm_connect(dev, CONNECT_EPP_MAYBE); |
1051 | imm_reset_pulse(base: dev->base); |
1052 | udelay(1000); |
1053 | imm_disconnect(dev); |
1054 | udelay(1000); |
1055 | if (dev->mode != old_mode) { |
1056 | dev->mode = old_mode; |
1057 | goto second_pass; |
1058 | } |
1059 | printk("imm: Unable to establish communication\n" ); |
1060 | return -EIO; |
1061 | } |
1062 | w_ctr(ppb, 0x0c); |
1063 | |
1064 | k = 1000000; /* 1 Second */ |
1065 | do { |
1066 | l = r_str(ppb); |
1067 | k--; |
1068 | udelay(1); |
1069 | } while (!(l & 0x80) && (k)); |
1070 | |
1071 | l &= 0xb8; |
1072 | |
1073 | if (l != 0xb8) { |
1074 | imm_disconnect(dev); |
1075 | imm_connect(dev, CONNECT_EPP_MAYBE); |
1076 | imm_reset_pulse(base: dev->base); |
1077 | udelay(1000); |
1078 | imm_disconnect(dev); |
1079 | udelay(1000); |
1080 | if (dev->mode != old_mode) { |
1081 | dev->mode = old_mode; |
1082 | goto second_pass; |
1083 | } |
1084 | printk |
1085 | ("imm: Unable to establish communication\n" ); |
1086 | return -EIO; |
1087 | } |
1088 | imm_disconnect(dev); |
1089 | printk |
1090 | ("imm: Communication established at 0x%x with ID %i using %s\n" , |
1091 | ppb, loop, IMM_MODE_STRING[dev->mode]); |
1092 | imm_connect(dev, CONNECT_EPP_MAYBE); |
1093 | imm_reset_pulse(base: dev->base); |
1094 | udelay(1000); |
1095 | imm_disconnect(dev); |
1096 | udelay(1000); |
1097 | return 0; |
1098 | } |
1099 | printk("imm: No devices found\n" ); |
1100 | return -ENODEV; |
1101 | } |
1102 | |
1103 | /* |
1104 | * imm cannot deal with highmem, so this causes all IO pages for this host |
1105 | * to reside in low memory (hence mapped) |
1106 | */ |
1107 | static int imm_adjust_queue(struct scsi_device *device) |
1108 | { |
1109 | blk_queue_bounce_limit(q: device->request_queue, limit: BLK_BOUNCE_HIGH); |
1110 | return 0; |
1111 | } |
1112 | |
1113 | static const struct scsi_host_template imm_template = { |
1114 | .module = THIS_MODULE, |
1115 | .proc_name = "imm" , |
1116 | .show_info = imm_show_info, |
1117 | .write_info = imm_write_info, |
1118 | .name = "Iomega VPI2 (imm) interface" , |
1119 | .queuecommand = imm_queuecommand, |
1120 | .eh_abort_handler = imm_abort, |
1121 | .eh_host_reset_handler = imm_reset, |
1122 | .bios_param = imm_biosparam, |
1123 | .this_id = 7, |
1124 | .sg_tablesize = SG_ALL, |
1125 | .can_queue = 1, |
1126 | .slave_alloc = imm_adjust_queue, |
1127 | .cmd_size = sizeof(struct scsi_pointer), |
1128 | }; |
1129 | |
1130 | /*************************************************************************** |
1131 | * Parallel port probing routines * |
1132 | ***************************************************************************/ |
1133 | |
1134 | static LIST_HEAD(imm_hosts); |
1135 | |
1136 | /* |
1137 | * Finds the first available device number that can be alloted to the |
1138 | * new imm device and returns the address of the previous node so that |
1139 | * we can add to the tail and have a list in the ascending order. |
1140 | */ |
1141 | |
1142 | static inline imm_struct *find_parent(void) |
1143 | { |
1144 | imm_struct *dev, *par = NULL; |
1145 | unsigned int cnt = 0; |
1146 | |
1147 | if (list_empty(head: &imm_hosts)) |
1148 | return NULL; |
1149 | |
1150 | list_for_each_entry(dev, &imm_hosts, list) { |
1151 | if (dev->dev_no != cnt) |
1152 | return par; |
1153 | cnt++; |
1154 | par = dev; |
1155 | } |
1156 | |
1157 | return par; |
1158 | } |
1159 | |
1160 | static int __imm_attach(struct parport *pb) |
1161 | { |
1162 | struct Scsi_Host *host; |
1163 | imm_struct *dev, *temp; |
1164 | DECLARE_WAIT_QUEUE_HEAD_ONSTACK(waiting); |
1165 | DEFINE_WAIT(wait); |
1166 | int ports; |
1167 | int err = -ENOMEM; |
1168 | struct pardev_cb imm_cb; |
1169 | |
1170 | init_waitqueue_head(&waiting); |
1171 | |
1172 | dev = kzalloc(size: sizeof(imm_struct), GFP_KERNEL); |
1173 | if (!dev) |
1174 | return -ENOMEM; |
1175 | |
1176 | |
1177 | dev->base = -1; |
1178 | dev->mode = mode < IMM_UNKNOWN ? mode : IMM_AUTODETECT; |
1179 | INIT_LIST_HEAD(list: &dev->list); |
1180 | |
1181 | temp = find_parent(); |
1182 | if (temp) |
1183 | dev->dev_no = temp->dev_no + 1; |
1184 | |
1185 | memset(&imm_cb, 0, sizeof(imm_cb)); |
1186 | imm_cb.private = dev; |
1187 | imm_cb.wakeup = imm_wakeup; |
1188 | |
1189 | dev->dev = parport_register_dev_model(port: pb, name: "imm" , par_dev_cb: &imm_cb, cnt: dev->dev_no); |
1190 | if (!dev->dev) |
1191 | goto out; |
1192 | |
1193 | |
1194 | /* Claim the bus so it remembers what we do to the control |
1195 | * registers. [ CTR and ECP ] |
1196 | */ |
1197 | err = -EBUSY; |
1198 | dev->waiting = &waiting; |
1199 | prepare_to_wait(wq_head: &waiting, wq_entry: &wait, TASK_UNINTERRUPTIBLE); |
1200 | if (imm_pb_claim(dev)) |
1201 | schedule_timeout(timeout: 3 * HZ); |
1202 | if (dev->wanted) { |
1203 | printk(KERN_ERR "imm%d: failed to claim parport because " |
1204 | "a pardevice is owning the port for too long " |
1205 | "time!\n" , pb->number); |
1206 | imm_pb_dismiss(dev); |
1207 | dev->waiting = NULL; |
1208 | finish_wait(wq_head: &waiting, wq_entry: &wait); |
1209 | goto out1; |
1210 | } |
1211 | dev->waiting = NULL; |
1212 | finish_wait(wq_head: &waiting, wq_entry: &wait); |
1213 | dev->base = dev->dev->port->base; |
1214 | dev->base_hi = dev->dev->port->base_hi; |
1215 | w_ctr(dev->base, 0x0c); |
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_DELAYED_WORK(&dev->imm_tq, imm_interrupt); |
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 | if (!temp) |
1245 | list_add_tail(new: &dev->list, head: &imm_hosts); |
1246 | else |
1247 | list_add_tail(new: &dev->list, head: &temp->list); |
1248 | err = scsi_add_host(host, NULL); |
1249 | if (err) |
1250 | goto out2; |
1251 | scsi_scan_host(host); |
1252 | return 0; |
1253 | |
1254 | out2: |
1255 | list_del_init(entry: &dev->list); |
1256 | scsi_host_put(t: host); |
1257 | out1: |
1258 | parport_unregister_device(dev: dev->dev); |
1259 | out: |
1260 | kfree(objp: dev); |
1261 | return err; |
1262 | } |
1263 | |
1264 | static void imm_attach(struct parport *pb) |
1265 | { |
1266 | __imm_attach(pb); |
1267 | } |
1268 | |
1269 | static void imm_detach(struct parport *pb) |
1270 | { |
1271 | imm_struct *dev; |
1272 | list_for_each_entry(dev, &imm_hosts, list) { |
1273 | if (dev->dev->port == pb) { |
1274 | list_del_init(entry: &dev->list); |
1275 | scsi_remove_host(dev->host); |
1276 | scsi_host_put(t: dev->host); |
1277 | parport_unregister_device(dev: dev->dev); |
1278 | kfree(objp: dev); |
1279 | break; |
1280 | } |
1281 | } |
1282 | } |
1283 | |
1284 | static struct parport_driver imm_driver = { |
1285 | .name = "imm" , |
1286 | .match_port = imm_attach, |
1287 | .detach = imm_detach, |
1288 | .devmodel = true, |
1289 | }; |
1290 | module_parport_driver(imm_driver); |
1291 | |
1292 | MODULE_LICENSE("GPL" ); |
1293 | |