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1da177e4 LT |
1 | /* |
2 | * linux/arch/arm/kernel/ecard.c | |
3 | * | |
4 | * Copyright 1995-2001 Russell King | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | * | |
10 | * Find all installed expansion cards, and handle interrupts from them. | |
11 | * | |
12 | * Created from information from Acorns RiscOS3 PRMs | |
13 | * | |
14 | * 08-Dec-1996 RMK Added code for the 9'th expansion card - the ether | |
15 | * podule slot. | |
16 | * 06-May-1997 RMK Added blacklist for cards whose loader doesn't work. | |
17 | * 12-Sep-1997 RMK Created new handling of interrupt enables/disables | |
18 | * - cards can now register their own routine to control | |
19 | * interrupts (recommended). | |
20 | * 29-Sep-1997 RMK Expansion card interrupt hardware not being re-enabled | |
21 | * on reset from Linux. (Caused cards not to respond | |
22 | * under RiscOS without hard reset). | |
23 | * 15-Feb-1998 RMK Added DMA support | |
24 | * 12-Sep-1998 RMK Added EASI support | |
25 | * 10-Jan-1999 RMK Run loaders in a simulated RISC OS environment. | |
26 | * 17-Apr-1999 RMK Support for EASI Type C cycles. | |
27 | */ | |
28 | #define ECARD_C | |
29 | ||
30 | #include <linux/config.h> | |
31 | #include <linux/module.h> | |
32 | #include <linux/kernel.h> | |
33 | #include <linux/types.h> | |
34 | #include <linux/sched.h> | |
35 | #include <linux/interrupt.h> | |
36 | #include <linux/completion.h> | |
37 | #include <linux/reboot.h> | |
38 | #include <linux/mm.h> | |
39 | #include <linux/slab.h> | |
40 | #include <linux/proc_fs.h> | |
41 | #include <linux/device.h> | |
42 | #include <linux/init.h> | |
00431707 | 43 | #include <linux/mutex.h> |
1da177e4 LT |
44 | |
45 | #include <asm/dma.h> | |
46 | #include <asm/ecard.h> | |
47 | #include <asm/hardware.h> | |
48 | #include <asm/io.h> | |
49 | #include <asm/irq.h> | |
50 | #include <asm/mmu_context.h> | |
51 | #include <asm/mach/irq.h> | |
52 | #include <asm/tlbflush.h> | |
53 | ||
54 | #ifndef CONFIG_ARCH_RPC | |
55 | #define HAVE_EXPMASK | |
56 | #endif | |
57 | ||
58 | struct ecard_request { | |
59 | void (*fn)(struct ecard_request *); | |
60 | ecard_t *ec; | |
61 | unsigned int address; | |
62 | unsigned int length; | |
63 | unsigned int use_loader; | |
64 | void *buffer; | |
65 | struct completion *complete; | |
66 | }; | |
67 | ||
68 | struct expcard_blacklist { | |
69 | unsigned short manufacturer; | |
70 | unsigned short product; | |
71 | const char *type; | |
72 | }; | |
73 | ||
74 | static ecard_t *cards; | |
75 | static ecard_t *slot_to_expcard[MAX_ECARDS]; | |
76 | static unsigned int ectcr; | |
77 | #ifdef HAS_EXPMASK | |
78 | static unsigned int have_expmask; | |
79 | #endif | |
80 | ||
81 | /* List of descriptions of cards which don't have an extended | |
82 | * identification, or chunk directories containing a description. | |
83 | */ | |
84 | static struct expcard_blacklist __initdata blacklist[] = { | |
85 | { MANU_ACORN, PROD_ACORN_ETHER1, "Acorn Ether1" } | |
86 | }; | |
87 | ||
88 | asmlinkage extern int | |
89 | ecard_loader_reset(unsigned long base, loader_t loader); | |
90 | asmlinkage extern int | |
91 | ecard_loader_read(int off, unsigned long base, loader_t loader); | |
92 | ||
93 | static inline unsigned short ecard_getu16(unsigned char *v) | |
94 | { | |
95 | return v[0] | v[1] << 8; | |
96 | } | |
97 | ||
98 | static inline signed long ecard_gets24(unsigned char *v) | |
99 | { | |
100 | return v[0] | v[1] << 8 | v[2] << 16 | ((v[2] & 0x80) ? 0xff000000 : 0); | |
101 | } | |
102 | ||
103 | static inline ecard_t *slot_to_ecard(unsigned int slot) | |
104 | { | |
105 | return slot < MAX_ECARDS ? slot_to_expcard[slot] : NULL; | |
106 | } | |
107 | ||
108 | /* ===================== Expansion card daemon ======================== */ | |
109 | /* | |
110 | * Since the loader programs on the expansion cards need to be run | |
111 | * in a specific environment, create a separate task with this | |
112 | * environment up, and pass requests to this task as and when we | |
113 | * need to. | |
114 | * | |
115 | * This should allow 99% of loaders to be called from Linux. | |
116 | * | |
117 | * From a security standpoint, we trust the card vendors. This | |
118 | * may be a misplaced trust. | |
119 | */ | |
120 | static void ecard_task_reset(struct ecard_request *req) | |
121 | { | |
122 | struct expansion_card *ec = req->ec; | |
123 | struct resource *res; | |
124 | ||
125 | res = ec->slot_no == 8 | |
126 | ? &ec->resource[ECARD_RES_MEMC] | |
127 | : ec->type == ECARD_EASI | |
128 | ? &ec->resource[ECARD_RES_EASI] | |
129 | : &ec->resource[ECARD_RES_IOCSYNC]; | |
130 | ||
131 | ecard_loader_reset(res->start, ec->loader); | |
132 | } | |
133 | ||
134 | static void ecard_task_readbytes(struct ecard_request *req) | |
135 | { | |
136 | struct expansion_card *ec = req->ec; | |
137 | unsigned char *buf = req->buffer; | |
138 | unsigned int len = req->length; | |
139 | unsigned int off = req->address; | |
140 | ||
141 | if (ec->slot_no == 8) { | |
142 | void __iomem *base = (void __iomem *) | |
143 | ec->resource[ECARD_RES_MEMC].start; | |
144 | ||
145 | /* | |
146 | * The card maintains an index which increments the address | |
147 | * into a 4096-byte page on each access. We need to keep | |
148 | * track of the counter. | |
149 | */ | |
150 | static unsigned int index; | |
151 | unsigned int page; | |
152 | ||
153 | page = (off >> 12) * 4; | |
154 | if (page > 256 * 4) | |
155 | return; | |
156 | ||
157 | off &= 4095; | |
158 | ||
159 | /* | |
160 | * If we are reading offset 0, or our current index is | |
161 | * greater than the offset, reset the hardware index counter. | |
162 | */ | |
163 | if (off == 0 || index > off) { | |
164 | writeb(0, base); | |
165 | index = 0; | |
166 | } | |
167 | ||
168 | /* | |
169 | * Increment the hardware index counter until we get to the | |
170 | * required offset. The read bytes are discarded. | |
171 | */ | |
172 | while (index < off) { | |
173 | readb(base + page); | |
174 | index += 1; | |
175 | } | |
176 | ||
177 | while (len--) { | |
178 | *buf++ = readb(base + page); | |
179 | index += 1; | |
180 | } | |
181 | } else { | |
182 | unsigned long base = (ec->type == ECARD_EASI | |
183 | ? &ec->resource[ECARD_RES_EASI] | |
184 | : &ec->resource[ECARD_RES_IOCSYNC])->start; | |
185 | void __iomem *pbase = (void __iomem *)base; | |
186 | ||
187 | if (!req->use_loader || !ec->loader) { | |
188 | off *= 4; | |
189 | while (len--) { | |
190 | *buf++ = readb(pbase + off); | |
191 | off += 4; | |
192 | } | |
193 | } else { | |
194 | while(len--) { | |
195 | /* | |
196 | * The following is required by some | |
197 | * expansion card loader programs. | |
198 | */ | |
199 | *(unsigned long *)0x108 = 0; | |
200 | *buf++ = ecard_loader_read(off++, base, | |
201 | ec->loader); | |
202 | } | |
203 | } | |
204 | } | |
205 | ||
206 | } | |
207 | ||
208 | static DECLARE_WAIT_QUEUE_HEAD(ecard_wait); | |
209 | static struct ecard_request *ecard_req; | |
00431707 | 210 | static DEFINE_MUTEX(ecard_mutex); |
1da177e4 LT |
211 | |
212 | /* | |
213 | * Set up the expansion card daemon's page tables. | |
214 | */ | |
215 | static void ecard_init_pgtables(struct mm_struct *mm) | |
216 | { | |
217 | struct vm_area_struct vma; | |
218 | ||
219 | /* We want to set up the page tables for the following mapping: | |
220 | * Virtual Physical | |
221 | * 0x03000000 0x03000000 | |
222 | * 0x03010000 unmapped | |
223 | * 0x03210000 0x03210000 | |
224 | * 0x03400000 unmapped | |
225 | * 0x08000000 0x08000000 | |
226 | * 0x10000000 unmapped | |
227 | * | |
228 | * FIXME: we don't follow this 100% yet. | |
229 | */ | |
230 | pgd_t *src_pgd, *dst_pgd; | |
231 | ||
232 | src_pgd = pgd_offset(mm, (unsigned long)IO_BASE); | |
233 | dst_pgd = pgd_offset(mm, IO_START); | |
234 | ||
235 | memcpy(dst_pgd, src_pgd, sizeof(pgd_t) * (IO_SIZE / PGDIR_SIZE)); | |
236 | ||
237 | src_pgd = pgd_offset(mm, EASI_BASE); | |
238 | dst_pgd = pgd_offset(mm, EASI_START); | |
239 | ||
240 | memcpy(dst_pgd, src_pgd, sizeof(pgd_t) * (EASI_SIZE / PGDIR_SIZE)); | |
241 | ||
242 | vma.vm_mm = mm; | |
243 | ||
244 | flush_tlb_range(&vma, IO_START, IO_START + IO_SIZE); | |
245 | flush_tlb_range(&vma, EASI_START, EASI_START + EASI_SIZE); | |
246 | } | |
247 | ||
248 | static int ecard_init_mm(void) | |
249 | { | |
250 | struct mm_struct * mm = mm_alloc(); | |
251 | struct mm_struct *active_mm = current->active_mm; | |
252 | ||
253 | if (!mm) | |
254 | return -ENOMEM; | |
255 | ||
256 | current->mm = mm; | |
257 | current->active_mm = mm; | |
258 | activate_mm(active_mm, mm); | |
259 | mmdrop(active_mm); | |
260 | ecard_init_pgtables(mm); | |
261 | return 0; | |
262 | } | |
263 | ||
264 | static int | |
265 | ecard_task(void * unused) | |
266 | { | |
267 | daemonize("kecardd"); | |
268 | ||
269 | /* | |
270 | * Allocate a mm. We're not a lazy-TLB kernel task since we need | |
271 | * to set page table entries where the user space would be. Note | |
272 | * that this also creates the page tables. Failure is not an | |
273 | * option here. | |
274 | */ | |
275 | if (ecard_init_mm()) | |
276 | panic("kecardd: unable to alloc mm\n"); | |
277 | ||
278 | while (1) { | |
279 | struct ecard_request *req; | |
280 | ||
281 | wait_event_interruptible(ecard_wait, ecard_req != NULL); | |
282 | ||
283 | req = xchg(&ecard_req, NULL); | |
284 | if (req != NULL) { | |
285 | req->fn(req); | |
286 | complete(req->complete); | |
287 | } | |
288 | } | |
289 | } | |
290 | ||
291 | /* | |
292 | * Wake the expansion card daemon to action our request. | |
293 | * | |
294 | * FIXME: The test here is not sufficient to detect if the | |
295 | * kcardd is running. | |
296 | */ | |
297 | static void ecard_call(struct ecard_request *req) | |
298 | { | |
299 | DECLARE_COMPLETION(completion); | |
300 | ||
301 | req->complete = &completion; | |
302 | ||
00431707 | 303 | mutex_lock(&ecard_mutex); |
1da177e4 LT |
304 | ecard_req = req; |
305 | wake_up(&ecard_wait); | |
306 | ||
307 | /* | |
308 | * Now wait for kecardd to run. | |
309 | */ | |
310 | wait_for_completion(&completion); | |
00431707 | 311 | mutex_unlock(&ecard_mutex); |
1da177e4 LT |
312 | } |
313 | ||
314 | /* ======================= Mid-level card control ===================== */ | |
315 | ||
316 | static void | |
317 | ecard_readbytes(void *addr, ecard_t *ec, int off, int len, int useld) | |
318 | { | |
319 | struct ecard_request req; | |
320 | ||
321 | req.fn = ecard_task_readbytes; | |
322 | req.ec = ec; | |
323 | req.address = off; | |
324 | req.length = len; | |
325 | req.use_loader = useld; | |
326 | req.buffer = addr; | |
327 | ||
328 | ecard_call(&req); | |
329 | } | |
330 | ||
331 | int ecard_readchunk(struct in_chunk_dir *cd, ecard_t *ec, int id, int num) | |
332 | { | |
333 | struct ex_chunk_dir excd; | |
334 | int index = 16; | |
335 | int useld = 0; | |
336 | ||
337 | if (!ec->cid.cd) | |
338 | return 0; | |
339 | ||
340 | while(1) { | |
341 | ecard_readbytes(&excd, ec, index, 8, useld); | |
342 | index += 8; | |
343 | if (c_id(&excd) == 0) { | |
344 | if (!useld && ec->loader) { | |
345 | useld = 1; | |
346 | index = 0; | |
347 | continue; | |
348 | } | |
349 | return 0; | |
350 | } | |
351 | if (c_id(&excd) == 0xf0) { /* link */ | |
352 | index = c_start(&excd); | |
353 | continue; | |
354 | } | |
355 | if (c_id(&excd) == 0x80) { /* loader */ | |
356 | if (!ec->loader) { | |
357 | ec->loader = (loader_t)kmalloc(c_len(&excd), | |
358 | GFP_KERNEL); | |
359 | if (ec->loader) | |
360 | ecard_readbytes(ec->loader, ec, | |
361 | (int)c_start(&excd), | |
362 | c_len(&excd), useld); | |
363 | else | |
364 | return 0; | |
365 | } | |
366 | continue; | |
367 | } | |
368 | if (c_id(&excd) == id && num-- == 0) | |
369 | break; | |
370 | } | |
371 | ||
372 | if (c_id(&excd) & 0x80) { | |
373 | switch (c_id(&excd) & 0x70) { | |
374 | case 0x70: | |
375 | ecard_readbytes((unsigned char *)excd.d.string, ec, | |
376 | (int)c_start(&excd), c_len(&excd), | |
377 | useld); | |
378 | break; | |
379 | case 0x00: | |
380 | break; | |
381 | } | |
382 | } | |
383 | cd->start_offset = c_start(&excd); | |
384 | memcpy(cd->d.string, excd.d.string, 256); | |
385 | return 1; | |
386 | } | |
387 | ||
388 | /* ======================= Interrupt control ============================ */ | |
389 | ||
390 | static void ecard_def_irq_enable(ecard_t *ec, int irqnr) | |
391 | { | |
392 | #ifdef HAS_EXPMASK | |
393 | if (irqnr < 4 && have_expmask) { | |
394 | have_expmask |= 1 << irqnr; | |
395 | __raw_writeb(have_expmask, EXPMASK_ENABLE); | |
396 | } | |
397 | #endif | |
398 | } | |
399 | ||
400 | static void ecard_def_irq_disable(ecard_t *ec, int irqnr) | |
401 | { | |
402 | #ifdef HAS_EXPMASK | |
403 | if (irqnr < 4 && have_expmask) { | |
404 | have_expmask &= ~(1 << irqnr); | |
405 | __raw_writeb(have_expmask, EXPMASK_ENABLE); | |
406 | } | |
407 | #endif | |
408 | } | |
409 | ||
410 | static int ecard_def_irq_pending(ecard_t *ec) | |
411 | { | |
412 | return !ec->irqmask || readb(ec->irqaddr) & ec->irqmask; | |
413 | } | |
414 | ||
415 | static void ecard_def_fiq_enable(ecard_t *ec, int fiqnr) | |
416 | { | |
417 | panic("ecard_def_fiq_enable called - impossible"); | |
418 | } | |
419 | ||
420 | static void ecard_def_fiq_disable(ecard_t *ec, int fiqnr) | |
421 | { | |
422 | panic("ecard_def_fiq_disable called - impossible"); | |
423 | } | |
424 | ||
425 | static int ecard_def_fiq_pending(ecard_t *ec) | |
426 | { | |
427 | return !ec->fiqmask || readb(ec->fiqaddr) & ec->fiqmask; | |
428 | } | |
429 | ||
430 | static expansioncard_ops_t ecard_default_ops = { | |
431 | ecard_def_irq_enable, | |
432 | ecard_def_irq_disable, | |
433 | ecard_def_irq_pending, | |
434 | ecard_def_fiq_enable, | |
435 | ecard_def_fiq_disable, | |
436 | ecard_def_fiq_pending | |
437 | }; | |
438 | ||
439 | /* | |
440 | * Enable and disable interrupts from expansion cards. | |
441 | * (interrupts are disabled for these functions). | |
442 | * | |
443 | * They are not meant to be called directly, but via enable/disable_irq. | |
444 | */ | |
445 | static void ecard_irq_unmask(unsigned int irqnr) | |
446 | { | |
447 | ecard_t *ec = slot_to_ecard(irqnr - 32); | |
448 | ||
449 | if (ec) { | |
450 | if (!ec->ops) | |
451 | ec->ops = &ecard_default_ops; | |
452 | ||
453 | if (ec->claimed && ec->ops->irqenable) | |
454 | ec->ops->irqenable(ec, irqnr); | |
455 | else | |
456 | printk(KERN_ERR "ecard: rejecting request to " | |
457 | "enable IRQs for %d\n", irqnr); | |
458 | } | |
459 | } | |
460 | ||
461 | static void ecard_irq_mask(unsigned int irqnr) | |
462 | { | |
463 | ecard_t *ec = slot_to_ecard(irqnr - 32); | |
464 | ||
465 | if (ec) { | |
466 | if (!ec->ops) | |
467 | ec->ops = &ecard_default_ops; | |
468 | ||
469 | if (ec->ops && ec->ops->irqdisable) | |
470 | ec->ops->irqdisable(ec, irqnr); | |
471 | } | |
472 | } | |
473 | ||
474 | static struct irqchip ecard_chip = { | |
475 | .ack = ecard_irq_mask, | |
476 | .mask = ecard_irq_mask, | |
477 | .unmask = ecard_irq_unmask, | |
478 | }; | |
479 | ||
480 | void ecard_enablefiq(unsigned int fiqnr) | |
481 | { | |
482 | ecard_t *ec = slot_to_ecard(fiqnr); | |
483 | ||
484 | if (ec) { | |
485 | if (!ec->ops) | |
486 | ec->ops = &ecard_default_ops; | |
487 | ||
488 | if (ec->claimed && ec->ops->fiqenable) | |
489 | ec->ops->fiqenable(ec, fiqnr); | |
490 | else | |
491 | printk(KERN_ERR "ecard: rejecting request to " | |
492 | "enable FIQs for %d\n", fiqnr); | |
493 | } | |
494 | } | |
495 | ||
496 | void ecard_disablefiq(unsigned int fiqnr) | |
497 | { | |
498 | ecard_t *ec = slot_to_ecard(fiqnr); | |
499 | ||
500 | if (ec) { | |
501 | if (!ec->ops) | |
502 | ec->ops = &ecard_default_ops; | |
503 | ||
504 | if (ec->ops->fiqdisable) | |
505 | ec->ops->fiqdisable(ec, fiqnr); | |
506 | } | |
507 | } | |
508 | ||
509 | static void ecard_dump_irq_state(void) | |
510 | { | |
511 | ecard_t *ec; | |
512 | ||
513 | printk("Expansion card IRQ state:\n"); | |
514 | ||
515 | for (ec = cards; ec; ec = ec->next) { | |
516 | if (ec->slot_no == 8) | |
517 | continue; | |
518 | ||
519 | printk(" %d: %sclaimed, ", | |
520 | ec->slot_no, ec->claimed ? "" : "not "); | |
521 | ||
522 | if (ec->ops && ec->ops->irqpending && | |
523 | ec->ops != &ecard_default_ops) | |
524 | printk("irq %spending\n", | |
525 | ec->ops->irqpending(ec) ? "" : "not "); | |
526 | else | |
527 | printk("irqaddr %p, mask = %02X, status = %02X\n", | |
528 | ec->irqaddr, ec->irqmask, readb(ec->irqaddr)); | |
529 | } | |
530 | } | |
531 | ||
532 | static void ecard_check_lockup(struct irqdesc *desc) | |
533 | { | |
534 | static unsigned long last; | |
535 | static int lockup; | |
536 | ||
537 | /* | |
538 | * If the timer interrupt has not run since the last million | |
539 | * unrecognised expansion card interrupts, then there is | |
540 | * something seriously wrong. Disable the expansion card | |
541 | * interrupts so at least we can continue. | |
542 | * | |
543 | * Maybe we ought to start a timer to re-enable them some time | |
544 | * later? | |
545 | */ | |
546 | if (last == jiffies) { | |
547 | lockup += 1; | |
548 | if (lockup > 1000000) { | |
549 | printk(KERN_ERR "\nInterrupt lockup detected - " | |
550 | "disabling all expansion card interrupts\n"); | |
551 | ||
552 | desc->chip->mask(IRQ_EXPANSIONCARD); | |
553 | ecard_dump_irq_state(); | |
554 | } | |
555 | } else | |
556 | lockup = 0; | |
557 | ||
558 | /* | |
559 | * If we did not recognise the source of this interrupt, | |
560 | * warn the user, but don't flood the user with these messages. | |
561 | */ | |
562 | if (!last || time_after(jiffies, last + 5*HZ)) { | |
563 | last = jiffies; | |
564 | printk(KERN_WARNING "Unrecognised interrupt from backplane\n"); | |
565 | ecard_dump_irq_state(); | |
566 | } | |
567 | } | |
568 | ||
569 | static void | |
570 | ecard_irq_handler(unsigned int irq, struct irqdesc *desc, struct pt_regs *regs) | |
571 | { | |
572 | ecard_t *ec; | |
573 | int called = 0; | |
574 | ||
575 | desc->chip->mask(irq); | |
576 | for (ec = cards; ec; ec = ec->next) { | |
577 | int pending; | |
578 | ||
579 | if (!ec->claimed || ec->irq == NO_IRQ || ec->slot_no == 8) | |
580 | continue; | |
581 | ||
582 | if (ec->ops && ec->ops->irqpending) | |
583 | pending = ec->ops->irqpending(ec); | |
584 | else | |
585 | pending = ecard_default_ops.irqpending(ec); | |
586 | ||
587 | if (pending) { | |
588 | struct irqdesc *d = irq_desc + ec->irq; | |
664399e1 | 589 | desc_handle_irq(ec->irq, d, regs); |
1da177e4 LT |
590 | called ++; |
591 | } | |
592 | } | |
593 | desc->chip->unmask(irq); | |
594 | ||
595 | if (called == 0) | |
596 | ecard_check_lockup(desc); | |
597 | } | |
598 | ||
599 | #ifdef HAS_EXPMASK | |
600 | static unsigned char priority_masks[] = | |
601 | { | |
602 | 0xf0, 0xf1, 0xf3, 0xf7, 0xff, 0xff, 0xff, 0xff | |
603 | }; | |
604 | ||
605 | static unsigned char first_set[] = | |
606 | { | |
607 | 0x00, 0x00, 0x01, 0x00, 0x02, 0x00, 0x01, 0x00, | |
608 | 0x03, 0x00, 0x01, 0x00, 0x02, 0x00, 0x01, 0x00 | |
609 | }; | |
610 | ||
611 | static void | |
612 | ecard_irqexp_handler(unsigned int irq, struct irqdesc *desc, struct pt_regs *regs) | |
613 | { | |
614 | const unsigned int statusmask = 15; | |
615 | unsigned int status; | |
616 | ||
617 | status = __raw_readb(EXPMASK_STATUS) & statusmask; | |
618 | if (status) { | |
619 | unsigned int slot = first_set[status]; | |
620 | ecard_t *ec = slot_to_ecard(slot); | |
621 | ||
622 | if (ec->claimed) { | |
623 | struct irqdesc *d = irqdesc + ec->irq; | |
624 | /* | |
625 | * this ugly code is so that we can operate a | |
626 | * prioritorising system: | |
627 | * | |
628 | * Card 0 highest priority | |
629 | * Card 1 | |
630 | * Card 2 | |
631 | * Card 3 lowest priority | |
632 | * | |
633 | * Serial cards should go in 0/1, ethernet/scsi in 2/3 | |
634 | * otherwise you will lose serial data at high speeds! | |
635 | */ | |
664399e1 | 636 | desc_handle_irq(ec->irq, d, regs); |
1da177e4 LT |
637 | } else { |
638 | printk(KERN_WARNING "card%d: interrupt from unclaimed " | |
639 | "card???\n", slot); | |
640 | have_expmask &= ~(1 << slot); | |
641 | __raw_writeb(have_expmask, EXPMASK_ENABLE); | |
642 | } | |
643 | } else | |
644 | printk(KERN_WARNING "Wild interrupt from backplane (masks)\n"); | |
645 | } | |
646 | ||
647 | static int __init ecard_probeirqhw(void) | |
648 | { | |
649 | ecard_t *ec; | |
650 | int found; | |
651 | ||
652 | __raw_writeb(0x00, EXPMASK_ENABLE); | |
653 | __raw_writeb(0xff, EXPMASK_STATUS); | |
654 | found = (__raw_readb(EXPMASK_STATUS) & 15) == 0; | |
655 | __raw_writeb(0xff, EXPMASK_ENABLE); | |
656 | ||
657 | if (found) { | |
658 | printk(KERN_DEBUG "Expansion card interrupt " | |
659 | "management hardware found\n"); | |
660 | ||
661 | /* for each card present, set a bit to '1' */ | |
662 | have_expmask = 0x80000000; | |
663 | ||
664 | for (ec = cards; ec; ec = ec->next) | |
665 | have_expmask |= 1 << ec->slot_no; | |
666 | ||
667 | __raw_writeb(have_expmask, EXPMASK_ENABLE); | |
668 | } | |
669 | ||
670 | return found; | |
671 | } | |
672 | #else | |
673 | #define ecard_irqexp_handler NULL | |
674 | #define ecard_probeirqhw() (0) | |
675 | #endif | |
676 | ||
677 | #ifndef IO_EC_MEMC8_BASE | |
678 | #define IO_EC_MEMC8_BASE 0 | |
679 | #endif | |
680 | ||
681 | unsigned int __ecard_address(ecard_t *ec, card_type_t type, card_speed_t speed) | |
682 | { | |
683 | unsigned long address = 0; | |
684 | int slot = ec->slot_no; | |
685 | ||
686 | if (ec->slot_no == 8) | |
687 | return IO_EC_MEMC8_BASE; | |
688 | ||
689 | ectcr &= ~(1 << slot); | |
690 | ||
691 | switch (type) { | |
692 | case ECARD_MEMC: | |
693 | if (slot < 4) | |
694 | address = IO_EC_MEMC_BASE + (slot << 12); | |
695 | break; | |
696 | ||
697 | case ECARD_IOC: | |
698 | if (slot < 4) | |
699 | address = IO_EC_IOC_BASE + (slot << 12); | |
700 | #ifdef IO_EC_IOC4_BASE | |
701 | else | |
702 | address = IO_EC_IOC4_BASE + ((slot - 4) << 12); | |
703 | #endif | |
704 | if (address) | |
705 | address += speed << 17; | |
706 | break; | |
707 | ||
708 | #ifdef IO_EC_EASI_BASE | |
709 | case ECARD_EASI: | |
710 | address = IO_EC_EASI_BASE + (slot << 22); | |
711 | if (speed == ECARD_FAST) | |
712 | ectcr |= 1 << slot; | |
713 | break; | |
714 | #endif | |
715 | default: | |
716 | break; | |
717 | } | |
718 | ||
719 | #ifdef IOMD_ECTCR | |
720 | iomd_writeb(ectcr, IOMD_ECTCR); | |
721 | #endif | |
722 | return address; | |
723 | } | |
724 | ||
725 | static int ecard_prints(char *buffer, ecard_t *ec) | |
726 | { | |
727 | char *start = buffer; | |
728 | ||
729 | buffer += sprintf(buffer, " %d: %s ", ec->slot_no, | |
730 | ec->type == ECARD_EASI ? "EASI" : " "); | |
731 | ||
732 | if (ec->cid.id == 0) { | |
733 | struct in_chunk_dir incd; | |
734 | ||
735 | buffer += sprintf(buffer, "[%04X:%04X] ", | |
736 | ec->cid.manufacturer, ec->cid.product); | |
737 | ||
738 | if (!ec->card_desc && ec->cid.cd && | |
739 | ecard_readchunk(&incd, ec, 0xf5, 0)) { | |
740 | ec->card_desc = kmalloc(strlen(incd.d.string)+1, GFP_KERNEL); | |
741 | ||
742 | if (ec->card_desc) | |
743 | strcpy((char *)ec->card_desc, incd.d.string); | |
744 | } | |
745 | ||
746 | buffer += sprintf(buffer, "%s\n", ec->card_desc ? ec->card_desc : "*unknown*"); | |
747 | } else | |
748 | buffer += sprintf(buffer, "Simple card %d\n", ec->cid.id); | |
749 | ||
750 | return buffer - start; | |
751 | } | |
752 | ||
753 | static int get_ecard_dev_info(char *buf, char **start, off_t pos, int count) | |
754 | { | |
755 | ecard_t *ec = cards; | |
756 | off_t at = 0; | |
757 | int len, cnt; | |
758 | ||
759 | cnt = 0; | |
760 | while (ec && count > cnt) { | |
761 | len = ecard_prints(buf, ec); | |
762 | at += len; | |
763 | if (at >= pos) { | |
764 | if (!*start) { | |
765 | *start = buf + (pos - (at - len)); | |
766 | cnt = at - pos; | |
767 | } else | |
768 | cnt += len; | |
769 | buf += len; | |
770 | } | |
771 | ec = ec->next; | |
772 | } | |
773 | return (count > cnt) ? cnt : count; | |
774 | } | |
775 | ||
776 | static struct proc_dir_entry *proc_bus_ecard_dir = NULL; | |
777 | ||
778 | static void ecard_proc_init(void) | |
779 | { | |
780 | proc_bus_ecard_dir = proc_mkdir("ecard", proc_bus); | |
781 | create_proc_info_entry("devices", 0, proc_bus_ecard_dir, | |
782 | get_ecard_dev_info); | |
783 | } | |
784 | ||
785 | #define ec_set_resource(ec,nr,st,sz) \ | |
786 | do { \ | |
787 | (ec)->resource[nr].name = ec->dev.bus_id; \ | |
788 | (ec)->resource[nr].start = st; \ | |
789 | (ec)->resource[nr].end = (st) + (sz) - 1; \ | |
790 | (ec)->resource[nr].flags = IORESOURCE_MEM; \ | |
791 | } while (0) | |
792 | ||
793 | static void __init ecard_free_card(struct expansion_card *ec) | |
794 | { | |
795 | int i; | |
796 | ||
797 | for (i = 0; i < ECARD_NUM_RESOURCES; i++) | |
798 | if (ec->resource[i].flags) | |
799 | release_resource(&ec->resource[i]); | |
800 | ||
801 | kfree(ec); | |
802 | } | |
803 | ||
804 | static struct expansion_card *__init ecard_alloc_card(int type, int slot) | |
805 | { | |
806 | struct expansion_card *ec; | |
807 | unsigned long base; | |
808 | int i; | |
809 | ||
d2a02b93 | 810 | ec = kzalloc(sizeof(ecard_t), GFP_KERNEL); |
1da177e4 LT |
811 | if (!ec) { |
812 | ec = ERR_PTR(-ENOMEM); | |
813 | goto nomem; | |
814 | } | |
815 | ||
1da177e4 LT |
816 | ec->slot_no = slot; |
817 | ec->type = type; | |
818 | ec->irq = NO_IRQ; | |
819 | ec->fiq = NO_IRQ; | |
820 | ec->dma = NO_DMA; | |
821 | ec->ops = &ecard_default_ops; | |
822 | ||
823 | snprintf(ec->dev.bus_id, sizeof(ec->dev.bus_id), "ecard%d", slot); | |
824 | ec->dev.parent = NULL; | |
825 | ec->dev.bus = &ecard_bus_type; | |
826 | ec->dev.dma_mask = &ec->dma_mask; | |
827 | ec->dma_mask = (u64)0xffffffff; | |
828 | ||
829 | if (slot < 4) { | |
830 | ec_set_resource(ec, ECARD_RES_MEMC, | |
831 | PODSLOT_MEMC_BASE + (slot << 14), | |
832 | PODSLOT_MEMC_SIZE); | |
833 | base = PODSLOT_IOC0_BASE + (slot << 14); | |
834 | } else | |
835 | base = PODSLOT_IOC4_BASE + ((slot - 4) << 14); | |
836 | ||
837 | #ifdef CONFIG_ARCH_RPC | |
838 | if (slot < 8) { | |
839 | ec_set_resource(ec, ECARD_RES_EASI, | |
840 | PODSLOT_EASI_BASE + (slot << 24), | |
841 | PODSLOT_EASI_SIZE); | |
842 | } | |
843 | ||
844 | if (slot == 8) { | |
845 | ec_set_resource(ec, ECARD_RES_MEMC, NETSLOT_BASE, NETSLOT_SIZE); | |
846 | } else | |
847 | #endif | |
848 | ||
849 | for (i = 0; i <= ECARD_RES_IOCSYNC - ECARD_RES_IOCSLOW; i++) | |
850 | ec_set_resource(ec, i + ECARD_RES_IOCSLOW, | |
851 | base + (i << 19), PODSLOT_IOC_SIZE); | |
852 | ||
853 | for (i = 0; i < ECARD_NUM_RESOURCES; i++) { | |
854 | if (ec->resource[i].flags && | |
855 | request_resource(&iomem_resource, &ec->resource[i])) { | |
856 | printk(KERN_ERR "%s: resource(s) not available\n", | |
857 | ec->dev.bus_id); | |
858 | ec->resource[i].end -= ec->resource[i].start; | |
859 | ec->resource[i].start = 0; | |
860 | ec->resource[i].flags = 0; | |
861 | } | |
862 | } | |
863 | ||
864 | nomem: | |
865 | return ec; | |
866 | } | |
867 | ||
ff381d22 | 868 | static ssize_t ecard_show_irq(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
869 | { |
870 | struct expansion_card *ec = ECARD_DEV(dev); | |
871 | return sprintf(buf, "%u\n", ec->irq); | |
872 | } | |
873 | ||
ff381d22 | 874 | static ssize_t ecard_show_dma(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
875 | { |
876 | struct expansion_card *ec = ECARD_DEV(dev); | |
877 | return sprintf(buf, "%u\n", ec->dma); | |
878 | } | |
879 | ||
ff381d22 | 880 | static ssize_t ecard_show_resources(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
881 | { |
882 | struct expansion_card *ec = ECARD_DEV(dev); | |
883 | char *str = buf; | |
884 | int i; | |
885 | ||
886 | for (i = 0; i < ECARD_NUM_RESOURCES; i++) | |
887 | str += sprintf(str, "%08lx %08lx %08lx\n", | |
888 | ec->resource[i].start, | |
889 | ec->resource[i].end, | |
890 | ec->resource[i].flags); | |
891 | ||
892 | return str - buf; | |
893 | } | |
894 | ||
ff381d22 | 895 | static ssize_t ecard_show_vendor(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
896 | { |
897 | struct expansion_card *ec = ECARD_DEV(dev); | |
898 | return sprintf(buf, "%u\n", ec->cid.manufacturer); | |
899 | } | |
900 | ||
ff381d22 | 901 | static ssize_t ecard_show_device(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
902 | { |
903 | struct expansion_card *ec = ECARD_DEV(dev); | |
904 | return sprintf(buf, "%u\n", ec->cid.product); | |
905 | } | |
906 | ||
ff381d22 | 907 | static ssize_t ecard_show_type(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
908 | { |
909 | struct expansion_card *ec = ECARD_DEV(dev); | |
910 | return sprintf(buf, "%s\n", ec->type == ECARD_EASI ? "EASI" : "IOC"); | |
911 | } | |
912 | ||
913 | static struct device_attribute ecard_dev_attrs[] = { | |
914 | __ATTR(device, S_IRUGO, ecard_show_device, NULL), | |
915 | __ATTR(dma, S_IRUGO, ecard_show_dma, NULL), | |
916 | __ATTR(irq, S_IRUGO, ecard_show_irq, NULL), | |
917 | __ATTR(resource, S_IRUGO, ecard_show_resources, NULL), | |
918 | __ATTR(type, S_IRUGO, ecard_show_type, NULL), | |
919 | __ATTR(vendor, S_IRUGO, ecard_show_vendor, NULL), | |
920 | __ATTR_NULL, | |
921 | }; | |
922 | ||
923 | ||
924 | int ecard_request_resources(struct expansion_card *ec) | |
925 | { | |
926 | int i, err = 0; | |
927 | ||
928 | for (i = 0; i < ECARD_NUM_RESOURCES; i++) { | |
929 | if (ecard_resource_end(ec, i) && | |
930 | !request_mem_region(ecard_resource_start(ec, i), | |
931 | ecard_resource_len(ec, i), | |
932 | ec->dev.driver->name)) { | |
933 | err = -EBUSY; | |
934 | break; | |
935 | } | |
936 | } | |
937 | ||
938 | if (err) { | |
939 | while (i--) | |
940 | if (ecard_resource_end(ec, i)) | |
941 | release_mem_region(ecard_resource_start(ec, i), | |
942 | ecard_resource_len(ec, i)); | |
943 | } | |
944 | return err; | |
945 | } | |
946 | EXPORT_SYMBOL(ecard_request_resources); | |
947 | ||
948 | void ecard_release_resources(struct expansion_card *ec) | |
949 | { | |
950 | int i; | |
951 | ||
952 | for (i = 0; i < ECARD_NUM_RESOURCES; i++) | |
953 | if (ecard_resource_end(ec, i)) | |
954 | release_mem_region(ecard_resource_start(ec, i), | |
955 | ecard_resource_len(ec, i)); | |
956 | } | |
957 | EXPORT_SYMBOL(ecard_release_resources); | |
958 | ||
959 | /* | |
960 | * Probe for an expansion card. | |
961 | * | |
962 | * If bit 1 of the first byte of the card is set, then the | |
963 | * card does not exist. | |
964 | */ | |
965 | static int __init | |
966 | ecard_probe(int slot, card_type_t type) | |
967 | { | |
968 | ecard_t **ecp; | |
969 | ecard_t *ec; | |
970 | struct ex_ecid cid; | |
971 | int i, rc; | |
972 | ||
973 | ec = ecard_alloc_card(type, slot); | |
974 | if (IS_ERR(ec)) { | |
975 | rc = PTR_ERR(ec); | |
976 | goto nomem; | |
977 | } | |
978 | ||
979 | rc = -ENODEV; | |
980 | if ((ec->podaddr = ecard_address(ec, type, ECARD_SYNC)) == 0) | |
981 | goto nodev; | |
982 | ||
983 | cid.r_zero = 1; | |
984 | ecard_readbytes(&cid, ec, 0, 16, 0); | |
985 | if (cid.r_zero) | |
986 | goto nodev; | |
987 | ||
988 | ec->cid.id = cid.r_id; | |
989 | ec->cid.cd = cid.r_cd; | |
990 | ec->cid.is = cid.r_is; | |
991 | ec->cid.w = cid.r_w; | |
992 | ec->cid.manufacturer = ecard_getu16(cid.r_manu); | |
993 | ec->cid.product = ecard_getu16(cid.r_prod); | |
994 | ec->cid.country = cid.r_country; | |
995 | ec->cid.irqmask = cid.r_irqmask; | |
996 | ec->cid.irqoff = ecard_gets24(cid.r_irqoff); | |
997 | ec->cid.fiqmask = cid.r_fiqmask; | |
998 | ec->cid.fiqoff = ecard_gets24(cid.r_fiqoff); | |
999 | ec->fiqaddr = | |
1000 | ec->irqaddr = (void __iomem *)ioaddr(ec->podaddr); | |
1001 | ||
1002 | if (ec->cid.is) { | |
1003 | ec->irqmask = ec->cid.irqmask; | |
1004 | ec->irqaddr += ec->cid.irqoff; | |
1005 | ec->fiqmask = ec->cid.fiqmask; | |
1006 | ec->fiqaddr += ec->cid.fiqoff; | |
1007 | } else { | |
1008 | ec->irqmask = 1; | |
1009 | ec->fiqmask = 4; | |
1010 | } | |
1011 | ||
1012 | for (i = 0; i < sizeof(blacklist) / sizeof(*blacklist); i++) | |
1013 | if (blacklist[i].manufacturer == ec->cid.manufacturer && | |
1014 | blacklist[i].product == ec->cid.product) { | |
1015 | ec->card_desc = blacklist[i].type; | |
1016 | break; | |
1017 | } | |
1018 | ||
1019 | /* | |
1020 | * hook the interrupt handlers | |
1021 | */ | |
1022 | if (slot < 8) { | |
1023 | ec->irq = 32 + slot; | |
1024 | set_irq_chip(ec->irq, &ecard_chip); | |
1025 | set_irq_handler(ec->irq, do_level_IRQ); | |
1026 | set_irq_flags(ec->irq, IRQF_VALID); | |
1027 | } | |
1028 | ||
1029 | #ifdef IO_EC_MEMC8_BASE | |
1030 | if (slot == 8) | |
1031 | ec->irq = 11; | |
1032 | #endif | |
1033 | #ifdef CONFIG_ARCH_RPC | |
1034 | /* On RiscPC, only first two slots have DMA capability */ | |
1035 | if (slot < 2) | |
1036 | ec->dma = 2 + slot; | |
1037 | #endif | |
1038 | ||
1039 | for (ecp = &cards; *ecp; ecp = &(*ecp)->next); | |
1040 | ||
1041 | *ecp = ec; | |
1042 | slot_to_expcard[slot] = ec; | |
1043 | ||
1044 | device_register(&ec->dev); | |
1045 | ||
1046 | return 0; | |
1047 | ||
1048 | nodev: | |
1049 | ecard_free_card(ec); | |
1050 | nomem: | |
1051 | return rc; | |
1052 | } | |
1053 | ||
1054 | /* | |
1055 | * Initialise the expansion card system. | |
1056 | * Locate all hardware - interrupt management and | |
1057 | * actual cards. | |
1058 | */ | |
1059 | static int __init ecard_init(void) | |
1060 | { | |
1061 | int slot, irqhw, ret; | |
1062 | ||
1063 | ret = kernel_thread(ecard_task, NULL, CLONE_KERNEL); | |
1064 | if (ret < 0) { | |
1065 | printk(KERN_ERR "Ecard: unable to create kernel thread: %d\n", | |
1066 | ret); | |
1067 | return ret; | |
1068 | } | |
1069 | ||
1070 | printk("Probing expansion cards\n"); | |
1071 | ||
1072 | for (slot = 0; slot < 8; slot ++) { | |
1073 | if (ecard_probe(slot, ECARD_EASI) == -ENODEV) | |
1074 | ecard_probe(slot, ECARD_IOC); | |
1075 | } | |
1076 | ||
1077 | #ifdef IO_EC_MEMC8_BASE | |
1078 | ecard_probe(8, ECARD_IOC); | |
1079 | #endif | |
1080 | ||
1081 | irqhw = ecard_probeirqhw(); | |
1082 | ||
1083 | set_irq_chained_handler(IRQ_EXPANSIONCARD, | |
1084 | irqhw ? ecard_irqexp_handler : ecard_irq_handler); | |
1085 | ||
1086 | ecard_proc_init(); | |
1087 | ||
1088 | return 0; | |
1089 | } | |
1090 | ||
1091 | subsys_initcall(ecard_init); | |
1092 | ||
1093 | /* | |
1094 | * ECARD "bus" | |
1095 | */ | |
1096 | static const struct ecard_id * | |
1097 | ecard_match_device(const struct ecard_id *ids, struct expansion_card *ec) | |
1098 | { | |
1099 | int i; | |
1100 | ||
1101 | for (i = 0; ids[i].manufacturer != 65535; i++) | |
1102 | if (ec->cid.manufacturer == ids[i].manufacturer && | |
1103 | ec->cid.product == ids[i].product) | |
1104 | return ids + i; | |
1105 | ||
1106 | return NULL; | |
1107 | } | |
1108 | ||
1109 | static int ecard_drv_probe(struct device *dev) | |
1110 | { | |
1111 | struct expansion_card *ec = ECARD_DEV(dev); | |
1112 | struct ecard_driver *drv = ECARD_DRV(dev->driver); | |
1113 | const struct ecard_id *id; | |
1114 | int ret; | |
1115 | ||
1116 | id = ecard_match_device(drv->id_table, ec); | |
1117 | ||
1118 | ecard_claim(ec); | |
1119 | ret = drv->probe(ec, id); | |
1120 | if (ret) | |
1121 | ecard_release(ec); | |
1122 | return ret; | |
1123 | } | |
1124 | ||
1125 | static int ecard_drv_remove(struct device *dev) | |
1126 | { | |
1127 | struct expansion_card *ec = ECARD_DEV(dev); | |
1128 | struct ecard_driver *drv = ECARD_DRV(dev->driver); | |
1129 | ||
1130 | drv->remove(ec); | |
1131 | ecard_release(ec); | |
1132 | ||
1133 | return 0; | |
1134 | } | |
1135 | ||
1136 | /* | |
1137 | * Before rebooting, we must make sure that the expansion card is in a | |
1138 | * sensible state, so it can be re-detected. This means that the first | |
1139 | * page of the ROM must be visible. We call the expansion cards reset | |
1140 | * handler, if any. | |
1141 | */ | |
1142 | static void ecard_drv_shutdown(struct device *dev) | |
1143 | { | |
1144 | struct expansion_card *ec = ECARD_DEV(dev); | |
1145 | struct ecard_driver *drv = ECARD_DRV(dev->driver); | |
1146 | struct ecard_request req; | |
1147 | ||
e08b7541 RK |
1148 | if (dev->driver) { |
1149 | if (drv->shutdown) | |
1150 | drv->shutdown(ec); | |
1151 | ecard_release(ec); | |
1152 | } | |
1da177e4 LT |
1153 | |
1154 | /* | |
1155 | * If this card has a loader, call the reset handler. | |
1156 | */ | |
1157 | if (ec->loader) { | |
1158 | req.fn = ecard_task_reset; | |
1159 | req.ec = ec; | |
1160 | ecard_call(&req); | |
1161 | } | |
1162 | } | |
1163 | ||
1164 | int ecard_register_driver(struct ecard_driver *drv) | |
1165 | { | |
1166 | drv->drv.bus = &ecard_bus_type; | |
1da177e4 LT |
1167 | |
1168 | return driver_register(&drv->drv); | |
1169 | } | |
1170 | ||
1171 | void ecard_remove_driver(struct ecard_driver *drv) | |
1172 | { | |
1173 | driver_unregister(&drv->drv); | |
1174 | } | |
1175 | ||
1176 | static int ecard_match(struct device *_dev, struct device_driver *_drv) | |
1177 | { | |
1178 | struct expansion_card *ec = ECARD_DEV(_dev); | |
1179 | struct ecard_driver *drv = ECARD_DRV(_drv); | |
1180 | int ret; | |
1181 | ||
1182 | if (drv->id_table) { | |
1183 | ret = ecard_match_device(drv->id_table, ec) != NULL; | |
1184 | } else { | |
1185 | ret = ec->cid.id == drv->id; | |
1186 | } | |
1187 | ||
1188 | return ret; | |
1189 | } | |
1190 | ||
1191 | struct bus_type ecard_bus_type = { | |
1192 | .name = "ecard", | |
1193 | .dev_attrs = ecard_dev_attrs, | |
1194 | .match = ecard_match, | |
e08b7541 RK |
1195 | .probe = ecard_drv_probe, |
1196 | .remove = ecard_drv_remove, | |
1197 | .shutdown = ecard_drv_shutdown, | |
1da177e4 LT |
1198 | }; |
1199 | ||
1200 | static int ecard_bus_init(void) | |
1201 | { | |
1202 | return bus_register(&ecard_bus_type); | |
1203 | } | |
1204 | ||
1205 | postcore_initcall(ecard_bus_init); | |
1206 | ||
1207 | EXPORT_SYMBOL(ecard_readchunk); | |
1208 | EXPORT_SYMBOL(__ecard_address); | |
1209 | EXPORT_SYMBOL(ecard_register_driver); | |
1210 | EXPORT_SYMBOL(ecard_remove_driver); | |
1211 | EXPORT_SYMBOL(ecard_bus_type); |