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1 | /* $Id: avm_cs.c,v 1.4.6.3 2001/09/23 22:24:33 kai Exp $ |
2 | * | |
3 | * A PCMCIA client driver for AVM B1/M1/M2 | |
4 | * | |
5 | * Copyright 1999 by Carsten Paeth <calle@calle.de> | |
6 | * | |
7 | * This software may be used and distributed according to the terms | |
8 | * of the GNU General Public License, incorporated herein by reference. | |
9 | * | |
10 | */ | |
11 | ||
12 | #include <linux/module.h> | |
13 | #include <linux/kernel.h> | |
14 | #include <linux/init.h> | |
15 | #include <linux/sched.h> | |
16 | #include <linux/ptrace.h> | |
17 | #include <linux/slab.h> | |
18 | #include <linux/string.h> | |
19 | #include <linux/tty.h> | |
20 | #include <linux/serial.h> | |
21 | #include <linux/major.h> | |
22 | #include <asm/io.h> | |
23 | #include <asm/system.h> | |
24 | ||
25 | #include <pcmcia/version.h> | |
26 | #include <pcmcia/cs_types.h> | |
27 | #include <pcmcia/cs.h> | |
28 | #include <pcmcia/cistpl.h> | |
29 | #include <pcmcia/ciscode.h> | |
30 | #include <pcmcia/ds.h> | |
31 | #include <pcmcia/cisreg.h> | |
32 | ||
33 | #include <linux/skbuff.h> | |
34 | #include <linux/capi.h> | |
35 | #include <linux/b1lli.h> | |
36 | #include <linux/b1pcmcia.h> | |
37 | ||
38 | /*====================================================================*/ | |
39 | ||
40 | MODULE_DESCRIPTION("CAPI4Linux: PCMCIA client driver for AVM B1/M1/M2"); | |
41 | MODULE_AUTHOR("Carsten Paeth"); | |
42 | MODULE_LICENSE("GPL"); | |
43 | ||
44 | /*====================================================================*/ | |
45 | ||
46 | /* | |
47 | The event() function is this driver's Card Services event handler. | |
48 | It will be called by Card Services when an appropriate card status | |
49 | event is received. The config() and release() entry points are | |
50 | used to configure or release a socket, in response to card insertion | |
51 | and ejection events. They are invoked from the skeleton event | |
52 | handler. | |
53 | */ | |
54 | ||
55 | static void avmcs_config(dev_link_t *link); | |
56 | static void avmcs_release(dev_link_t *link); | |
57 | static int avmcs_event(event_t event, int priority, | |
58 | event_callback_args_t *args); | |
59 | ||
60 | /* | |
61 | The attach() and detach() entry points are used to create and destroy | |
62 | "instances" of the driver, where each instance represents everything | |
63 | needed to manage one actual PCMCIA card. | |
64 | */ | |
65 | ||
66 | static dev_link_t *avmcs_attach(void); | |
67 | static void avmcs_detach(dev_link_t *); | |
68 | ||
69 | /* | |
70 | The dev_info variable is the "key" that is used to match up this | |
71 | device driver with appropriate cards, through the card configuration | |
72 | database. | |
73 | */ | |
74 | ||
75 | static dev_info_t dev_info = "avm_cs"; | |
76 | ||
77 | /* | |
78 | A linked list of "instances" of the skeleton device. Each actual | |
79 | PCMCIA card corresponds to one device instance, and is described | |
80 | by one dev_link_t structure (defined in ds.h). | |
81 | ||
82 | You may not want to use a linked list for this -- for example, the | |
83 | memory card driver uses an array of dev_link_t pointers, where minor | |
84 | device numbers are used to derive the corresponding array index. | |
85 | */ | |
86 | ||
87 | static dev_link_t *dev_list = NULL; | |
88 | ||
89 | /* | |
90 | A dev_link_t structure has fields for most things that are needed | |
91 | to keep track of a socket, but there will usually be some device | |
92 | specific information that also needs to be kept track of. The | |
93 | 'priv' pointer in a dev_link_t structure can be used to point to | |
94 | a device-specific private data structure, like this. | |
95 | ||
96 | A driver needs to provide a dev_node_t structure for each device | |
97 | on a card. In some cases, there is only one device per card (for | |
98 | example, ethernet cards, modems). In other cases, there may be | |
99 | many actual or logical devices (SCSI adapters, memory cards with | |
100 | multiple partitions). The dev_node_t structures need to be kept | |
101 | in a linked list starting at the 'dev' field of a dev_link_t | |
102 | structure. We allocate them in the card's private data structure, | |
103 | because they generally can't be allocated dynamically. | |
104 | */ | |
105 | ||
106 | typedef struct local_info_t { | |
107 | dev_node_t node; | |
108 | } local_info_t; | |
109 | ||
110 | /*====================================================================== | |
111 | ||
112 | avmcs_attach() creates an "instance" of the driver, allocating | |
113 | local data structures for one device. The device is registered | |
114 | with Card Services. | |
115 | ||
116 | The dev_link structure is initialized, but we don't actually | |
117 | configure the card at this point -- we wait until we receive a | |
118 | card insertion event. | |
119 | ||
120 | ======================================================================*/ | |
121 | ||
122 | static dev_link_t *avmcs_attach(void) | |
123 | { | |
124 | client_reg_t client_reg; | |
125 | dev_link_t *link; | |
126 | local_info_t *local; | |
127 | int ret; | |
128 | ||
129 | /* Initialize the dev_link_t structure */ | |
130 | link = kmalloc(sizeof(struct dev_link_t), GFP_KERNEL); | |
131 | if (!link) | |
132 | goto err; | |
133 | memset(link, 0, sizeof(struct dev_link_t)); | |
134 | ||
135 | /* The io structure describes IO port mapping */ | |
136 | link->io.NumPorts1 = 16; | |
137 | link->io.Attributes1 = IO_DATA_PATH_WIDTH_8; | |
138 | link->io.NumPorts2 = 0; | |
139 | ||
140 | /* Interrupt setup */ | |
141 | link->irq.Attributes = IRQ_TYPE_EXCLUSIVE; | |
142 | link->irq.Attributes = IRQ_TYPE_DYNAMIC_SHARING|IRQ_FIRST_SHARED; | |
143 | ||
144 | link->irq.IRQInfo1 = IRQ_LEVEL_ID; | |
145 | ||
146 | /* General socket configuration */ | |
147 | link->conf.Attributes = CONF_ENABLE_IRQ; | |
148 | link->conf.Vcc = 50; | |
149 | link->conf.IntType = INT_MEMORY_AND_IO; | |
150 | link->conf.ConfigIndex = 1; | |
151 | link->conf.Present = PRESENT_OPTION; | |
152 | ||
153 | /* Allocate space for private device-specific data */ | |
154 | local = kmalloc(sizeof(local_info_t), GFP_KERNEL); | |
155 | if (!local) | |
156 | goto err_kfree; | |
157 | memset(local, 0, sizeof(local_info_t)); | |
158 | link->priv = local; | |
159 | ||
160 | /* Register with Card Services */ | |
161 | link->next = dev_list; | |
162 | dev_list = link; | |
163 | client_reg.dev_info = &dev_info; | |
164 | client_reg.EventMask = | |
165 | CS_EVENT_CARD_INSERTION | CS_EVENT_CARD_REMOVAL | | |
166 | CS_EVENT_RESET_PHYSICAL | CS_EVENT_CARD_RESET | | |
167 | CS_EVENT_PM_SUSPEND | CS_EVENT_PM_RESUME; | |
168 | client_reg.event_handler = &avmcs_event; | |
169 | client_reg.Version = 0x0210; | |
170 | client_reg.event_callback_args.client_data = link; | |
171 | ret = pcmcia_register_client(&link->handle, &client_reg); | |
172 | if (ret != 0) { | |
173 | cs_error(link->handle, RegisterClient, ret); | |
174 | avmcs_detach(link); | |
175 | goto err; | |
176 | } | |
177 | return link; | |
178 | ||
179 | err_kfree: | |
180 | kfree(link); | |
181 | err: | |
182 | return NULL; | |
183 | } /* avmcs_attach */ | |
184 | ||
185 | /*====================================================================== | |
186 | ||
187 | This deletes a driver "instance". The device is de-registered | |
188 | with Card Services. If it has been released, all local data | |
189 | structures are freed. Otherwise, the structures will be freed | |
190 | when the device is released. | |
191 | ||
192 | ======================================================================*/ | |
193 | ||
194 | static void avmcs_detach(dev_link_t *link) | |
195 | { | |
196 | dev_link_t **linkp; | |
197 | ||
198 | /* Locate device structure */ | |
199 | for (linkp = &dev_list; *linkp; linkp = &(*linkp)->next) | |
200 | if (*linkp == link) break; | |
201 | if (*linkp == NULL) | |
202 | return; | |
203 | ||
204 | /* | |
205 | If the device is currently configured and active, we won't | |
206 | actually delete it yet. Instead, it is marked so that when | |
207 | the release() function is called, that will trigger a proper | |
208 | detach(). | |
209 | */ | |
210 | if (link->state & DEV_CONFIG) { | |
211 | link->state |= DEV_STALE_LINK; | |
212 | return; | |
213 | } | |
214 | ||
215 | /* Break the link with Card Services */ | |
216 | if (link->handle) | |
217 | pcmcia_deregister_client(link->handle); | |
218 | ||
219 | /* Unlink device structure, free pieces */ | |
220 | *linkp = link->next; | |
221 | if (link->priv) { | |
222 | kfree(link->priv); | |
223 | } | |
224 | kfree(link); | |
225 | ||
226 | } /* avmcs_detach */ | |
227 | ||
228 | /*====================================================================== | |
229 | ||
230 | avmcs_config() is scheduled to run after a CARD_INSERTION event | |
231 | is received, to configure the PCMCIA socket, and to make the | |
232 | ethernet device available to the system. | |
233 | ||
234 | ======================================================================*/ | |
235 | ||
236 | static int get_tuple(client_handle_t handle, tuple_t *tuple, | |
237 | cisparse_t *parse) | |
238 | { | |
239 | int i = pcmcia_get_tuple_data(handle, tuple); | |
240 | if (i != CS_SUCCESS) return i; | |
241 | return pcmcia_parse_tuple(handle, tuple, parse); | |
242 | } | |
243 | ||
244 | static int first_tuple(client_handle_t handle, tuple_t *tuple, | |
245 | cisparse_t *parse) | |
246 | { | |
247 | int i = pcmcia_get_first_tuple(handle, tuple); | |
248 | if (i != CS_SUCCESS) return i; | |
249 | return get_tuple(handle, tuple, parse); | |
250 | } | |
251 | ||
252 | static int next_tuple(client_handle_t handle, tuple_t *tuple, | |
253 | cisparse_t *parse) | |
254 | { | |
255 | int i = pcmcia_get_next_tuple(handle, tuple); | |
256 | if (i != CS_SUCCESS) return i; | |
257 | return get_tuple(handle, tuple, parse); | |
258 | } | |
259 | ||
260 | static void avmcs_config(dev_link_t *link) | |
261 | { | |
262 | client_handle_t handle; | |
263 | tuple_t tuple; | |
264 | cisparse_t parse; | |
265 | cistpl_cftable_entry_t *cf = &parse.cftable_entry; | |
266 | local_info_t *dev; | |
267 | int i; | |
268 | u_char buf[64]; | |
269 | char devname[128]; | |
270 | int cardtype; | |
271 | int (*addcard)(unsigned int port, unsigned irq); | |
272 | ||
273 | handle = link->handle; | |
274 | dev = link->priv; | |
275 | ||
276 | /* | |
277 | This reads the card's CONFIG tuple to find its configuration | |
278 | registers. | |
279 | */ | |
280 | do { | |
281 | tuple.DesiredTuple = CISTPL_CONFIG; | |
282 | i = pcmcia_get_first_tuple(handle, &tuple); | |
283 | if (i != CS_SUCCESS) break; | |
284 | tuple.TupleData = buf; | |
285 | tuple.TupleDataMax = 64; | |
286 | tuple.TupleOffset = 0; | |
287 | i = pcmcia_get_tuple_data(handle, &tuple); | |
288 | if (i != CS_SUCCESS) break; | |
289 | i = pcmcia_parse_tuple(handle, &tuple, &parse); | |
290 | if (i != CS_SUCCESS) break; | |
291 | link->conf.ConfigBase = parse.config.base; | |
292 | } while (0); | |
293 | if (i != CS_SUCCESS) { | |
294 | cs_error(link->handle, ParseTuple, i); | |
295 | link->state &= ~DEV_CONFIG_PENDING; | |
296 | return; | |
297 | } | |
298 | ||
299 | /* Configure card */ | |
300 | link->state |= DEV_CONFIG; | |
301 | ||
302 | do { | |
303 | ||
304 | tuple.Attributes = 0; | |
305 | tuple.TupleData = buf; | |
306 | tuple.TupleDataMax = 254; | |
307 | tuple.TupleOffset = 0; | |
308 | tuple.DesiredTuple = CISTPL_VERS_1; | |
309 | ||
310 | devname[0] = 0; | |
311 | if( !first_tuple(handle, &tuple, &parse) && parse.version_1.ns > 1 ) { | |
312 | strlcpy(devname,parse.version_1.str + parse.version_1.ofs[1], | |
313 | sizeof(devname)); | |
314 | } | |
315 | /* | |
316 | * find IO port | |
317 | */ | |
318 | tuple.TupleData = (cisdata_t *)buf; | |
319 | tuple.TupleOffset = 0; tuple.TupleDataMax = 255; | |
320 | tuple.Attributes = 0; | |
321 | tuple.DesiredTuple = CISTPL_CFTABLE_ENTRY; | |
322 | i = first_tuple(handle, &tuple, &parse); | |
323 | while (i == CS_SUCCESS) { | |
324 | if (cf->io.nwin > 0) { | |
325 | link->conf.ConfigIndex = cf->index; | |
326 | link->io.BasePort1 = cf->io.win[0].base; | |
327 | link->io.NumPorts1 = cf->io.win[0].len; | |
328 | link->io.NumPorts2 = 0; | |
329 | printk(KERN_INFO "avm_cs: testing i/o %#x-%#x\n", | |
330 | link->io.BasePort1, | |
331 | link->io.BasePort1+link->io.NumPorts1-1); | |
332 | i = pcmcia_request_io(link->handle, &link->io); | |
333 | if (i == CS_SUCCESS) goto found_port; | |
334 | } | |
335 | i = next_tuple(handle, &tuple, &parse); | |
336 | } | |
337 | ||
338 | found_port: | |
339 | if (i != CS_SUCCESS) { | |
340 | cs_error(link->handle, RequestIO, i); | |
341 | break; | |
342 | } | |
343 | ||
344 | /* | |
345 | * allocate an interrupt line | |
346 | */ | |
347 | i = pcmcia_request_irq(link->handle, &link->irq); | |
348 | if (i != CS_SUCCESS) { | |
349 | cs_error(link->handle, RequestIRQ, i); | |
350 | pcmcia_release_io(link->handle, &link->io); | |
351 | break; | |
352 | } | |
353 | ||
354 | /* | |
355 | * configure the PCMCIA socket | |
356 | */ | |
357 | i = pcmcia_request_configuration(link->handle, &link->conf); | |
358 | if (i != CS_SUCCESS) { | |
359 | cs_error(link->handle, RequestConfiguration, i); | |
360 | pcmcia_release_io(link->handle, &link->io); | |
361 | pcmcia_release_irq(link->handle, &link->irq); | |
362 | break; | |
363 | } | |
364 | ||
365 | } while (0); | |
366 | ||
367 | /* At this point, the dev_node_t structure(s) should be | |
368 | initialized and arranged in a linked list at link->dev. */ | |
369 | ||
370 | if (devname[0]) { | |
371 | char *s = strrchr(devname, ' '); | |
372 | if (!s) | |
373 | s = devname; | |
374 | else s++; | |
375 | strcpy(dev->node.dev_name, s); | |
376 | if (strcmp("M1", s) == 0) { | |
377 | cardtype = AVM_CARDTYPE_M1; | |
378 | } else if (strcmp("M2", s) == 0) { | |
379 | cardtype = AVM_CARDTYPE_M2; | |
380 | } else { | |
381 | cardtype = AVM_CARDTYPE_B1; | |
382 | } | |
383 | } else { | |
384 | strcpy(dev->node.dev_name, "b1"); | |
385 | cardtype = AVM_CARDTYPE_B1; | |
386 | } | |
387 | ||
388 | dev->node.major = 64; | |
389 | dev->node.minor = 0; | |
390 | link->dev = &dev->node; | |
391 | ||
392 | link->state &= ~DEV_CONFIG_PENDING; | |
393 | /* If any step failed, release any partially configured state */ | |
394 | if (i != 0) { | |
395 | avmcs_release(link); | |
396 | return; | |
397 | } | |
398 | ||
399 | ||
400 | switch (cardtype) { | |
401 | case AVM_CARDTYPE_M1: addcard = b1pcmcia_addcard_m1; break; | |
402 | case AVM_CARDTYPE_M2: addcard = b1pcmcia_addcard_m2; break; | |
403 | default: | |
404 | case AVM_CARDTYPE_B1: addcard = b1pcmcia_addcard_b1; break; | |
405 | } | |
406 | if ((i = (*addcard)(link->io.BasePort1, link->irq.AssignedIRQ)) < 0) { | |
407 | printk(KERN_ERR "avm_cs: failed to add AVM-%s-Controller at i/o %#x, irq %d\n", | |
408 | dev->node.dev_name, link->io.BasePort1, link->irq.AssignedIRQ); | |
409 | avmcs_release(link); | |
410 | return; | |
411 | } | |
412 | dev->node.minor = i; | |
413 | ||
414 | } /* avmcs_config */ | |
415 | ||
416 | /*====================================================================== | |
417 | ||
418 | After a card is removed, avmcs_release() will unregister the net | |
419 | device, and release the PCMCIA configuration. If the device is | |
420 | still open, this will be postponed until it is closed. | |
421 | ||
422 | ======================================================================*/ | |
423 | ||
424 | static void avmcs_release(dev_link_t *link) | |
425 | { | |
426 | b1pcmcia_delcard(link->io.BasePort1, link->irq.AssignedIRQ); | |
427 | ||
428 | /* Unlink the device chain */ | |
429 | link->dev = NULL; | |
430 | ||
431 | /* Don't bother checking to see if these succeed or not */ | |
432 | pcmcia_release_configuration(link->handle); | |
433 | pcmcia_release_io(link->handle, &link->io); | |
434 | pcmcia_release_irq(link->handle, &link->irq); | |
435 | link->state &= ~DEV_CONFIG; | |
436 | ||
437 | if (link->state & DEV_STALE_LINK) | |
438 | avmcs_detach(link); | |
439 | ||
440 | } /* avmcs_release */ | |
441 | ||
442 | /*====================================================================== | |
443 | ||
444 | The card status event handler. Mostly, this schedules other | |
445 | stuff to run after an event is received. A CARD_REMOVAL event | |
446 | also sets some flags to discourage the net drivers from trying | |
447 | to talk to the card any more. | |
448 | ||
449 | When a CARD_REMOVAL event is received, we immediately set a flag | |
450 | to block future accesses to this device. All the functions that | |
451 | actually access the device should check this flag to make sure | |
452 | the card is still present. | |
453 | ||
454 | ======================================================================*/ | |
455 | ||
456 | static int avmcs_event(event_t event, int priority, | |
457 | event_callback_args_t *args) | |
458 | { | |
459 | dev_link_t *link = args->client_data; | |
460 | ||
461 | switch (event) { | |
462 | case CS_EVENT_CARD_REMOVAL: | |
463 | link->state &= ~DEV_PRESENT; | |
464 | if (link->state & DEV_CONFIG) | |
465 | avmcs_release(link); | |
466 | break; | |
467 | case CS_EVENT_CARD_INSERTION: | |
468 | link->state |= DEV_PRESENT | DEV_CONFIG_PENDING; | |
469 | avmcs_config(link); | |
470 | break; | |
471 | case CS_EVENT_PM_SUSPEND: | |
472 | link->state |= DEV_SUSPEND; | |
473 | /* Fall through... */ | |
474 | case CS_EVENT_RESET_PHYSICAL: | |
475 | if (link->state & DEV_CONFIG) | |
476 | pcmcia_release_configuration(link->handle); | |
477 | break; | |
478 | case CS_EVENT_PM_RESUME: | |
479 | link->state &= ~DEV_SUSPEND; | |
480 | /* Fall through... */ | |
481 | case CS_EVENT_CARD_RESET: | |
482 | if (link->state & DEV_CONFIG) | |
483 | pcmcia_request_configuration(link->handle, &link->conf); | |
484 | break; | |
485 | } | |
486 | return 0; | |
487 | } /* avmcs_event */ | |
488 | ||
489 | static struct pcmcia_driver avmcs_driver = { | |
490 | .owner = THIS_MODULE, | |
491 | .drv = { | |
492 | .name = "avm_cs", | |
493 | }, | |
494 | .attach = avmcs_attach, | |
495 | .detach = avmcs_detach, | |
496 | }; | |
497 | ||
498 | static int __init avmcs_init(void) | |
499 | { | |
500 | return pcmcia_register_driver(&avmcs_driver); | |
501 | } | |
502 | ||
503 | static void __exit avmcs_exit(void) | |
504 | { | |
505 | pcmcia_unregister_driver(&avmcs_driver); | |
506 | BUG_ON(dev_list != NULL); | |
507 | } | |
508 | ||
509 | module_init(avmcs_init); | |
510 | module_exit(avmcs_exit); |