Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * IEEE 1284.3 Parallel port daisy chain and multiplexor code | |
3 | * | |
4 | * Copyright (C) 1999, 2000 Tim Waugh <tim@cyberelk.demon.co.uk> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public License | |
8 | * as published by the Free Software Foundation; either version | |
9 | * 2 of the License, or (at your option) any later version. | |
10 | * | |
11 | * ??-12-1998: Initial implementation. | |
12 | * 31-01-1999: Make port-cloning transparent. | |
13 | * 13-02-1999: Move DeviceID technique from parport_probe. | |
14 | * 13-03-1999: Get DeviceID from non-IEEE 1284.3 devices too. | |
15 | * 22-02-2000: Count devices that are actually detected. | |
16 | * | |
17 | * Any part of this program may be used in documents licensed under | |
18 | * the GNU Free Documentation License, Version 1.1 or any later version | |
19 | * published by the Free Software Foundation. | |
20 | */ | |
21 | ||
22 | #include <linux/module.h> | |
23 | #include <linux/parport.h> | |
24 | #include <linux/delay.h> | |
25 | #include <linux/sched.h> | |
26 | ||
27 | #include <asm/current.h> | |
28 | #include <asm/uaccess.h> | |
29 | ||
30 | #undef DEBUG | |
31 | ||
32 | #ifdef DEBUG | |
33 | #define DPRINTK(stuff...) printk (stuff) | |
34 | #else | |
35 | #define DPRINTK(stuff...) | |
36 | #endif | |
37 | ||
38 | static struct daisydev { | |
39 | struct daisydev *next; | |
40 | struct parport *port; | |
41 | int daisy; | |
42 | int devnum; | |
43 | } *topology = NULL; | |
44 | static DEFINE_SPINLOCK(topology_lock); | |
45 | ||
46 | static int numdevs = 0; | |
47 | ||
48 | /* Forward-declaration of lower-level functions. */ | |
49 | static int mux_present (struct parport *port); | |
50 | static int num_mux_ports (struct parport *port); | |
51 | static int select_port (struct parport *port); | |
52 | static int assign_addrs (struct parport *port); | |
53 | ||
54 | /* Add a device to the discovered topology. */ | |
55 | static void add_dev (int devnum, struct parport *port, int daisy) | |
56 | { | |
57 | struct daisydev *newdev, **p; | |
58 | newdev = kmalloc (sizeof (struct daisydev), GFP_KERNEL); | |
59 | if (newdev) { | |
60 | newdev->port = port; | |
61 | newdev->daisy = daisy; | |
62 | newdev->devnum = devnum; | |
63 | spin_lock(&topology_lock); | |
64 | for (p = &topology; *p && (*p)->devnum<devnum; p = &(*p)->next) | |
65 | ; | |
66 | newdev->next = *p; | |
67 | *p = newdev; | |
68 | spin_unlock(&topology_lock); | |
69 | } | |
70 | } | |
71 | ||
72 | /* Clone a parport (actually, make an alias). */ | |
73 | static struct parport *clone_parport (struct parport *real, int muxport) | |
74 | { | |
75 | struct parport *extra = parport_register_port (real->base, | |
76 | real->irq, | |
77 | real->dma, | |
78 | real->ops); | |
79 | if (extra) { | |
80 | extra->portnum = real->portnum; | |
81 | extra->physport = real; | |
82 | extra->muxport = muxport; | |
83 | real->slaves[muxport-1] = extra; | |
84 | } | |
85 | ||
86 | return extra; | |
87 | } | |
88 | ||
89 | /* Discover the IEEE1284.3 topology on a port -- muxes and daisy chains. | |
90 | * Return value is number of devices actually detected. */ | |
91 | int parport_daisy_init (struct parport *port) | |
92 | { | |
93 | int detected = 0; | |
94 | char *deviceid; | |
95 | static const char *th[] = { /*0*/"th", "st", "nd", "rd", "th" }; | |
96 | int num_ports; | |
97 | int i; | |
98 | int last_try = 0; | |
99 | ||
100 | again: | |
101 | /* Because this is called before any other devices exist, | |
102 | * we don't have to claim exclusive access. */ | |
103 | ||
104 | /* If mux present on normal port, need to create new | |
105 | * parports for each extra port. */ | |
106 | if (port->muxport < 0 && mux_present (port) && | |
107 | /* don't be fooled: a mux must have 2 or 4 ports. */ | |
108 | ((num_ports = num_mux_ports (port)) == 2 || num_ports == 4)) { | |
109 | /* Leave original as port zero. */ | |
110 | port->muxport = 0; | |
111 | printk (KERN_INFO | |
112 | "%s: 1st (default) port of %d-way multiplexor\n", | |
113 | port->name, num_ports); | |
114 | for (i = 1; i < num_ports; i++) { | |
115 | /* Clone the port. */ | |
116 | struct parport *extra = clone_parport (port, i); | |
117 | if (!extra) { | |
118 | if (signal_pending (current)) | |
119 | break; | |
120 | ||
121 | schedule (); | |
122 | continue; | |
123 | } | |
124 | ||
125 | printk (KERN_INFO | |
126 | "%s: %d%s port of %d-way multiplexor on %s\n", | |
127 | extra->name, i + 1, th[i + 1], num_ports, | |
128 | port->name); | |
129 | ||
130 | /* Analyse that port too. We won't recurse | |
131 | forever because of the 'port->muxport < 0' | |
132 | test above. */ | |
133 | parport_daisy_init(extra); | |
134 | } | |
135 | } | |
136 | ||
137 | if (port->muxport >= 0) | |
138 | select_port (port); | |
139 | ||
140 | parport_daisy_deselect_all (port); | |
141 | detected += assign_addrs (port); | |
142 | ||
143 | /* Count the potential legacy device at the end. */ | |
144 | add_dev (numdevs++, port, -1); | |
145 | ||
146 | /* Find out the legacy device's IEEE 1284 device ID. */ | |
147 | deviceid = kmalloc (1000, GFP_KERNEL); | |
148 | if (deviceid) { | |
149 | if (parport_device_id (numdevs - 1, deviceid, 1000) > 2) | |
150 | detected++; | |
151 | ||
152 | kfree (deviceid); | |
153 | } | |
154 | ||
155 | if (!detected && !last_try) { | |
156 | /* No devices were detected. Perhaps they are in some | |
157 | funny state; let's try to reset them and see if | |
158 | they wake up. */ | |
159 | parport_daisy_fini (port); | |
160 | parport_write_control (port, PARPORT_CONTROL_SELECT); | |
161 | udelay (50); | |
162 | parport_write_control (port, | |
163 | PARPORT_CONTROL_SELECT | | |
164 | PARPORT_CONTROL_INIT); | |
165 | udelay (50); | |
166 | last_try = 1; | |
167 | goto again; | |
168 | } | |
169 | ||
170 | return detected; | |
171 | } | |
172 | ||
173 | /* Forget about devices on a physical port. */ | |
174 | void parport_daisy_fini (struct parport *port) | |
175 | { | |
176 | struct daisydev **p; | |
177 | ||
178 | spin_lock(&topology_lock); | |
179 | p = &topology; | |
180 | while (*p) { | |
181 | struct daisydev *dev = *p; | |
182 | if (dev->port != port) { | |
183 | p = &dev->next; | |
184 | continue; | |
185 | } | |
186 | *p = dev->next; | |
187 | kfree(dev); | |
188 | } | |
189 | ||
190 | /* Gaps in the numbering could be handled better. How should | |
191 | someone enumerate through all IEEE1284.3 devices in the | |
192 | topology?. */ | |
193 | if (!topology) numdevs = 0; | |
194 | spin_unlock(&topology_lock); | |
195 | return; | |
196 | } | |
197 | ||
198 | /** | |
199 | * parport_open - find a device by canonical device number | |
200 | * @devnum: canonical device number | |
201 | * @name: name to associate with the device | |
202 | * @pf: preemption callback | |
203 | * @kf: kick callback | |
204 | * @irqf: interrupt handler | |
205 | * @flags: registration flags | |
206 | * @handle: driver data | |
207 | * | |
208 | * This function is similar to parport_register_device(), except | |
209 | * that it locates a device by its number rather than by the port | |
210 | * it is attached to. | |
211 | * | |
212 | * All parameters except for @devnum are the same as for | |
213 | * parport_register_device(). The return value is the same as | |
214 | * for parport_register_device(). | |
215 | **/ | |
216 | ||
217 | struct pardevice *parport_open (int devnum, const char *name, | |
218 | int (*pf) (void *), void (*kf) (void *), | |
219 | void (*irqf) (int, void *, struct pt_regs *), | |
220 | int flags, void *handle) | |
221 | { | |
222 | struct daisydev *p = topology; | |
223 | struct parport *port; | |
224 | struct pardevice *dev; | |
225 | int daisy; | |
226 | ||
227 | spin_lock(&topology_lock); | |
228 | while (p && p->devnum != devnum) | |
229 | p = p->next; | |
230 | ||
231 | if (!p) { | |
232 | spin_unlock(&topology_lock); | |
233 | return NULL; | |
234 | } | |
235 | ||
236 | daisy = p->daisy; | |
237 | port = parport_get_port(p->port); | |
238 | spin_unlock(&topology_lock); | |
239 | ||
240 | dev = parport_register_device (port, name, pf, kf, | |
241 | irqf, flags, handle); | |
242 | parport_put_port(port); | |
243 | if (!dev) | |
244 | return NULL; | |
245 | ||
246 | dev->daisy = daisy; | |
247 | ||
248 | /* Check that there really is a device to select. */ | |
249 | if (daisy >= 0) { | |
250 | int selected; | |
251 | parport_claim_or_block (dev); | |
252 | selected = port->daisy; | |
253 | parport_release (dev); | |
254 | ||
c29a75ed | 255 | if (selected != daisy) { |
1da177e4 LT |
256 | /* No corresponding device. */ |
257 | parport_unregister_device (dev); | |
258 | return NULL; | |
259 | } | |
260 | } | |
261 | ||
262 | return dev; | |
263 | } | |
264 | ||
265 | /** | |
266 | * parport_close - close a device opened with parport_open() | |
267 | * @dev: device to close | |
268 | * | |
269 | * This is to parport_open() as parport_unregister_device() is to | |
270 | * parport_register_device(). | |
271 | **/ | |
272 | ||
273 | void parport_close (struct pardevice *dev) | |
274 | { | |
275 | parport_unregister_device (dev); | |
276 | } | |
277 | ||
278 | /** | |
279 | * parport_device_num - convert device coordinates | |
280 | * @parport: parallel port number | |
281 | * @mux: multiplexor port number (-1 for no multiplexor) | |
282 | * @daisy: daisy chain address (-1 for no daisy chain address) | |
283 | * | |
284 | * This tries to locate a device on the given parallel port, | |
285 | * multiplexor port and daisy chain address, and returns its | |
286 | * device number or -NXIO if no device with those coordinates | |
287 | * exists. | |
288 | **/ | |
289 | ||
290 | int parport_device_num (int parport, int mux, int daisy) | |
291 | { | |
292 | int res = -ENXIO; | |
293 | struct daisydev *dev; | |
294 | ||
295 | spin_lock(&topology_lock); | |
296 | dev = topology; | |
297 | while (dev && dev->port->portnum != parport && | |
298 | dev->port->muxport != mux && dev->daisy != daisy) | |
299 | dev = dev->next; | |
300 | if (dev) | |
301 | res = dev->devnum; | |
302 | spin_unlock(&topology_lock); | |
303 | ||
304 | return res; | |
305 | } | |
306 | ||
307 | /* Send a daisy-chain-style CPP command packet. */ | |
308 | static int cpp_daisy (struct parport *port, int cmd) | |
309 | { | |
310 | unsigned char s; | |
311 | ||
312 | parport_data_forward (port); | |
313 | parport_write_data (port, 0xaa); udelay (2); | |
314 | parport_write_data (port, 0x55); udelay (2); | |
315 | parport_write_data (port, 0x00); udelay (2); | |
316 | parport_write_data (port, 0xff); udelay (2); | |
317 | s = parport_read_status (port) & (PARPORT_STATUS_BUSY | |
318 | | PARPORT_STATUS_PAPEROUT | |
319 | | PARPORT_STATUS_SELECT | |
320 | | PARPORT_STATUS_ERROR); | |
321 | if (s != (PARPORT_STATUS_BUSY | |
322 | | PARPORT_STATUS_PAPEROUT | |
323 | | PARPORT_STATUS_SELECT | |
324 | | PARPORT_STATUS_ERROR)) { | |
325 | DPRINTK (KERN_DEBUG "%s: cpp_daisy: aa5500ff(%02x)\n", | |
326 | port->name, s); | |
327 | return -ENXIO; | |
328 | } | |
329 | ||
330 | parport_write_data (port, 0x87); udelay (2); | |
331 | s = parport_read_status (port) & (PARPORT_STATUS_BUSY | |
332 | | PARPORT_STATUS_PAPEROUT | |
333 | | PARPORT_STATUS_SELECT | |
334 | | PARPORT_STATUS_ERROR); | |
335 | if (s != (PARPORT_STATUS_SELECT | PARPORT_STATUS_ERROR)) { | |
336 | DPRINTK (KERN_DEBUG "%s: cpp_daisy: aa5500ff87(%02x)\n", | |
337 | port->name, s); | |
338 | return -ENXIO; | |
339 | } | |
340 | ||
341 | parport_write_data (port, 0x78); udelay (2); | |
342 | parport_write_data (port, cmd); udelay (2); | |
343 | parport_frob_control (port, | |
344 | PARPORT_CONTROL_STROBE, | |
345 | PARPORT_CONTROL_STROBE); | |
346 | udelay (1); | |
347 | parport_frob_control (port, PARPORT_CONTROL_STROBE, 0); | |
348 | udelay (1); | |
349 | s = parport_read_status (port); | |
350 | parport_write_data (port, 0xff); udelay (2); | |
351 | ||
352 | return s; | |
353 | } | |
354 | ||
355 | /* Send a mux-style CPP command packet. */ | |
356 | static int cpp_mux (struct parport *port, int cmd) | |
357 | { | |
358 | unsigned char s; | |
359 | int rc; | |
360 | ||
361 | parport_data_forward (port); | |
362 | parport_write_data (port, 0xaa); udelay (2); | |
363 | parport_write_data (port, 0x55); udelay (2); | |
364 | parport_write_data (port, 0xf0); udelay (2); | |
365 | parport_write_data (port, 0x0f); udelay (2); | |
366 | parport_write_data (port, 0x52); udelay (2); | |
367 | parport_write_data (port, 0xad); udelay (2); | |
368 | parport_write_data (port, cmd); udelay (2); | |
369 | ||
370 | s = parport_read_status (port); | |
371 | if (!(s & PARPORT_STATUS_ACK)) { | |
372 | DPRINTK (KERN_DEBUG "%s: cpp_mux: aa55f00f52ad%02x(%02x)\n", | |
373 | port->name, cmd, s); | |
374 | return -EIO; | |
375 | } | |
376 | ||
377 | rc = (((s & PARPORT_STATUS_SELECT ? 1 : 0) << 0) | | |
378 | ((s & PARPORT_STATUS_PAPEROUT ? 1 : 0) << 1) | | |
379 | ((s & PARPORT_STATUS_BUSY ? 0 : 1) << 2) | | |
380 | ((s & PARPORT_STATUS_ERROR ? 0 : 1) << 3)); | |
381 | ||
382 | return rc; | |
383 | } | |
384 | ||
385 | void parport_daisy_deselect_all (struct parport *port) | |
386 | { | |
387 | cpp_daisy (port, 0x30); | |
388 | } | |
389 | ||
390 | int parport_daisy_select (struct parport *port, int daisy, int mode) | |
391 | { | |
392 | switch (mode) | |
393 | { | |
394 | // For these modes we should switch to EPP mode: | |
395 | case IEEE1284_MODE_EPP: | |
396 | case IEEE1284_MODE_EPPSL: | |
397 | case IEEE1284_MODE_EPPSWE: | |
398 | return (cpp_daisy (port, 0x20 + daisy) & | |
399 | PARPORT_STATUS_ERROR); | |
400 | ||
401 | // For these modes we should switch to ECP mode: | |
402 | case IEEE1284_MODE_ECP: | |
403 | case IEEE1284_MODE_ECPRLE: | |
404 | case IEEE1284_MODE_ECPSWE: | |
405 | return (cpp_daisy (port, 0xd0 + daisy) & | |
406 | PARPORT_STATUS_ERROR); | |
407 | ||
408 | // Nothing was told for BECP in Daisy chain specification. | |
409 | // May be it's wise to use ECP? | |
410 | case IEEE1284_MODE_BECP: | |
411 | // Others use compat mode | |
412 | case IEEE1284_MODE_NIBBLE: | |
413 | case IEEE1284_MODE_BYTE: | |
414 | case IEEE1284_MODE_COMPAT: | |
415 | default: | |
416 | return (cpp_daisy (port, 0xe0 + daisy) & | |
417 | PARPORT_STATUS_ERROR); | |
418 | } | |
419 | } | |
420 | ||
421 | static int mux_present (struct parport *port) | |
422 | { | |
423 | return cpp_mux (port, 0x51) == 3; | |
424 | } | |
425 | ||
426 | static int num_mux_ports (struct parport *port) | |
427 | { | |
428 | return cpp_mux (port, 0x58); | |
429 | } | |
430 | ||
431 | static int select_port (struct parport *port) | |
432 | { | |
433 | int muxport = port->muxport; | |
434 | return cpp_mux (port, 0x60 + muxport) == muxport; | |
435 | } | |
436 | ||
437 | static int assign_addrs (struct parport *port) | |
438 | { | |
310c8c32 | 439 | unsigned char s; |
1da177e4 LT |
440 | unsigned char daisy; |
441 | int thisdev = numdevs; | |
442 | int detected; | |
443 | char *deviceid; | |
444 | ||
445 | parport_data_forward (port); | |
446 | parport_write_data (port, 0xaa); udelay (2); | |
447 | parport_write_data (port, 0x55); udelay (2); | |
448 | parport_write_data (port, 0x00); udelay (2); | |
449 | parport_write_data (port, 0xff); udelay (2); | |
450 | s = parport_read_status (port) & (PARPORT_STATUS_BUSY | |
451 | | PARPORT_STATUS_PAPEROUT | |
452 | | PARPORT_STATUS_SELECT | |
453 | | PARPORT_STATUS_ERROR); | |
454 | if (s != (PARPORT_STATUS_BUSY | |
455 | | PARPORT_STATUS_PAPEROUT | |
456 | | PARPORT_STATUS_SELECT | |
457 | | PARPORT_STATUS_ERROR)) { | |
458 | DPRINTK (KERN_DEBUG "%s: assign_addrs: aa5500ff(%02x)\n", | |
459 | port->name, s); | |
460 | return 0; | |
461 | } | |
462 | ||
463 | parport_write_data (port, 0x87); udelay (2); | |
464 | s = parport_read_status (port) & (PARPORT_STATUS_BUSY | |
465 | | PARPORT_STATUS_PAPEROUT | |
466 | | PARPORT_STATUS_SELECT | |
467 | | PARPORT_STATUS_ERROR); | |
468 | if (s != (PARPORT_STATUS_SELECT | PARPORT_STATUS_ERROR)) { | |
469 | DPRINTK (KERN_DEBUG "%s: assign_addrs: aa5500ff87(%02x)\n", | |
470 | port->name, s); | |
471 | return 0; | |
472 | } | |
473 | ||
474 | parport_write_data (port, 0x78); udelay (2); | |
310c8c32 | 475 | s = parport_read_status (port); |
1da177e4 | 476 | |
310c8c32 MK |
477 | for (daisy = 0; |
478 | (s & (PARPORT_STATUS_PAPEROUT|PARPORT_STATUS_SELECT)) | |
479 | == (PARPORT_STATUS_PAPEROUT|PARPORT_STATUS_SELECT) | |
480 | && daisy < 4; | |
481 | ++daisy) { | |
1da177e4 LT |
482 | parport_write_data (port, daisy); |
483 | udelay (2); | |
484 | parport_frob_control (port, | |
485 | PARPORT_CONTROL_STROBE, | |
486 | PARPORT_CONTROL_STROBE); | |
487 | udelay (1); | |
488 | parport_frob_control (port, PARPORT_CONTROL_STROBE, 0); | |
489 | udelay (1); | |
490 | ||
310c8c32 | 491 | add_dev (numdevs++, port, daisy); |
1da177e4 | 492 | |
310c8c32 MK |
493 | /* See if this device thought it was the last in the |
494 | * chain. */ | |
495 | if (!(s & PARPORT_STATUS_BUSY)) | |
496 | break; | |
1da177e4 | 497 | |
310c8c32 MK |
498 | /* We are seeing pass through status now. We see |
499 | last_dev from next device or if last_dev does not | |
500 | work status lines from some non-daisy chain | |
501 | device. */ | |
502 | s = parport_read_status (port); | |
1da177e4 LT |
503 | } |
504 | ||
505 | parport_write_data (port, 0xff); udelay (2); | |
506 | detected = numdevs - thisdev; | |
507 | DPRINTK (KERN_DEBUG "%s: Found %d daisy-chained devices\n", port->name, | |
508 | detected); | |
509 | ||
510 | /* Ask the new devices to introduce themselves. */ | |
511 | deviceid = kmalloc (1000, GFP_KERNEL); | |
512 | if (!deviceid) return 0; | |
513 | ||
514 | for (daisy = 0; thisdev < numdevs; thisdev++, daisy++) | |
515 | parport_device_id (thisdev, deviceid, 1000); | |
516 | ||
517 | kfree (deviceid); | |
518 | return detected; | |
519 | } |