File: /usr/src/linux/arch/arm/kernel/ecard.c
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/reboot.h>
37 #include <linux/mm.h>
38 #include <linux/slab.h>
39 #include <linux/proc_fs.h>
40 #include <linux/notifier.h>
41 #include <linux/init.h>
42
43 #include <asm/dma.h>
44 #include <asm/ecard.h>
45 #include <asm/hardware.h>
46 #include <asm/io.h>
47 #include <asm/irq.h>
48 #include <asm/pgalloc.h>
49 #include <asm/mmu_context.h>
50 #include <asm/mach/irq.h>
51
52 #ifndef CONFIG_ARCH_RPC
53 #define HAVE_EXPMASK
54 #endif
55
56 enum req {
57 req_readbytes,
58 req_reset_all
59 };
60
61 struct ecard_request {
62 enum req req;
63 ecard_t *ec;
64 unsigned int address;
65 unsigned int length;
66 unsigned int use_loader;
67 void *buffer;
68 };
69
70 struct expcard_blacklist {
71 unsigned short manufacturer;
72 unsigned short product;
73 const char *type;
74 };
75
76 static ecard_t *cards;
77 static ecard_t *slot_to_expcard[MAX_ECARDS];
78 static unsigned int ectcr;
79 #ifdef HAS_EXPMASK
80 static unsigned int have_expmask;
81 #endif
82
83 /* List of descriptions of cards which don't have an extended
84 * identification, or chunk directories containing a description.
85 */
86 static struct expcard_blacklist __initdata blacklist[] = {
87 { MANU_ACORN, PROD_ACORN_ETHER1, "Acorn Ether1" }
88 };
89
90 asmlinkage extern int
91 ecard_loader_reset(volatile unsigned char *pa, loader_t loader);
92 asmlinkage extern int
93 ecard_loader_read(int off, volatile unsigned char *pa, loader_t loader);
94 extern int setup_arm_irq(int, struct irqaction *);
95 extern void do_ecard_IRQ(int, struct pt_regs *);
96
97
98 static void
99 ecard_irq_noexpmask(int intr_no, void *dev_id, struct pt_regs *regs);
100
101 static struct irqaction irqexpansioncard = {
102 ecard_irq_noexpmask, SA_INTERRUPT, 0, "expansion cards", NULL, NULL
103 };
104
105 static inline unsigned short
106 ecard_getu16(unsigned char *v)
107 {
108 return v[0] | v[1] << 8;
109 }
110
111 static inline signed long
112 ecard_gets24(unsigned char *v)
113 {
114 return v[0] | v[1] << 8 | v[2] << 16 | ((v[2] & 0x80) ? 0xff000000 : 0);
115 }
116
117 static inline ecard_t *
118 slot_to_ecard(unsigned int slot)
119 {
120 return slot < MAX_ECARDS ? slot_to_expcard[slot] : NULL;
121 }
122
123 /* ===================== Expansion card daemon ======================== */
124 /*
125 * Since the loader programs on the expansion cards need to be run
126 * in a specific environment, create a separate task with this
127 * environment up, and pass requests to this task as and when we
128 * need to.
129 *
130 * This should allow 99% of loaders to be called from Linux.
131 *
132 * From a security standpoint, we trust the card vendors. This
133 * may be a misplaced trust.
134 */
135 #define BUS_ADDR(x) ((((unsigned long)(x)) << 2) + IO_BASE)
136 #define POD_INT_ADDR(x) ((volatile unsigned char *)\
137 ((BUS_ADDR((x)) - IO_BASE) + IO_START))
138
139 static inline void ecard_task_reset(void)
140 {
141 ecard_t *ec;
142
143 for (ec = cards; ec; ec = ec->next)
144 if (ec->loader)
145 ecard_loader_reset(POD_INT_ADDR(ec->podaddr),
146 ec->loader);
147 }
148
149 static void
150 ecard_task_readbytes(struct ecard_request *req)
151 {
152 unsigned char *buf = (unsigned char *)req->buffer;
153 volatile unsigned char *base_addr =
154 (volatile unsigned char *)POD_INT_ADDR(req->ec->podaddr);
155 unsigned int len = req->length;
156 unsigned int off = req->address;
157
158 if (req->ec->slot_no == 8) {
159 /*
160 * The card maintains an index which increments the address
161 * into a 4096-byte page on each access. We need to keep
162 * track of the counter.
163 */
164 static unsigned int index;
165 unsigned int page;
166
167 page = (off >> 12) * 4;
168 if (page > 256 * 4)
169 return;
170
171 off &= 4095;
172
173 /*
174 * If we are reading offset 0, or our current index is
175 * greater than the offset, reset the hardware index counter.
176 */
177 if (off == 0 || index > off) {
178 *base_addr = 0;
179 index = 0;
180 }
181
182 /*
183 * Increment the hardware index counter until we get to the
184 * required offset. The read bytes are discarded.
185 */
186 while (index < off) {
187 unsigned char byte;
188 byte = base_addr[page];
189 index += 1;
190 }
191
192 while (len--) {
193 *buf++ = base_addr[page];
194 index += 1;
195 }
196 } else {
197
198 if (!req->use_loader || !req->ec->loader) {
199 off *= 4;
200 while (len--) {
201 *buf++ = base_addr[off];
202 off += 4;
203 }
204 } else {
205 while(len--) {
206 /*
207 * The following is required by some
208 * expansion card loader programs.
209 */
210 *(unsigned long *)0x108 = 0;
211 *buf++ = ecard_loader_read(off++, base_addr,
212 req->ec->loader);
213 }
214 }
215 }
216
217 }
218
219 static void ecard_do_request(struct ecard_request *req)
220 {
221 switch (req->req) {
222 case req_readbytes:
223 ecard_task_readbytes(req);
224 break;
225
226 case req_reset_all:
227 ecard_task_reset();
228 break;
229 }
230 }
231
232 #ifdef CONFIG_CPU_32
233 #include <linux/completion.h>
234
235 static pid_t ecard_pid;
236 static wait_queue_head_t ecard_wait;
237 static struct ecard_request *ecard_req;
238
239 static DECLARE_COMPLETION(ecard_completion);
240
241 /*
242 * Set up the expansion card daemon's page tables.
243 */
244 static void ecard_init_pgtables(struct mm_struct *mm)
245 {
246 /* We want to set up the page tables for the following mapping:
247 * Virtual Physical
248 * 0x03000000 0x03000000
249 * 0x03010000 unmapped
250 * 0x03210000 0x03210000
251 * 0x03400000 unmapped
252 * 0x08000000 0x08000000
253 * 0x10000000 unmapped
254 *
255 * FIXME: we don't follow this 100% yet.
256 */
257 pgd_t *src_pgd, *dst_pgd;
258 unsigned int dst_addr = IO_START;
259
260 src_pgd = pgd_offset(mm, IO_BASE);
261 dst_pgd = pgd_offset(mm, dst_addr);
262
263 while (dst_addr < IO_START + IO_SIZE) {
264 *dst_pgd++ = *src_pgd++;
265 dst_addr += PGDIR_SIZE;
266 }
267
268 dst_addr = EASI_START;
269 src_pgd = pgd_offset(mm, EASI_BASE);
270 dst_pgd = pgd_offset(mm, dst_addr);
271
272 while (dst_addr < EASI_START + EASI_SIZE) {
273 *dst_pgd++ = *src_pgd++;
274 dst_addr += PGDIR_SIZE;
275 }
276
277 flush_tlb_range(mm, IO_START, IO_START + IO_SIZE);
278 flush_tlb_range(mm, EASI_START, EASI_START + EASI_SIZE);
279 }
280
281 static int ecard_init_mm(void)
282 {
283 struct mm_struct * mm = mm_alloc();
284 struct mm_struct *active_mm = current->active_mm;
285
286 if (!mm)
287 return -ENOMEM;
288
289 current->mm = mm;
290 current->active_mm = mm;
291 activate_mm(active_mm, mm);
292 mmdrop(active_mm);
293 ecard_init_pgtables(mm);
294 return 0;
295 }
296
297 static int
298 ecard_task(void * unused)
299 {
300 struct task_struct *tsk = current;
301
302 /*
303 * We don't want /any/ signals, not even SIGKILL
304 */
305 sigfillset(&tsk->blocked);
306 sigemptyset(&tsk->pending.signal);
307 recalc_sigpending(tsk);
308 strcpy(tsk->comm, "kecardd");
309 daemonize();
310
311 /*
312 * Allocate a mm. We're not a lazy-TLB kernel task since we need
313 * to set page table entries where the user space would be. Note
314 * that this also creates the page tables. Failure is not an
315 * option here.
316 */
317 if (ecard_init_mm())
318 panic("kecardd: unable to alloc mm\n");
319
320 while (1) {
321 struct ecard_request *req;
322
323 do {
324 req = xchg(&ecard_req, NULL);
325
326 if (req == NULL) {
327 sigemptyset(&tsk->pending.signal);
328 interruptible_sleep_on(&ecard_wait);
329 }
330 } while (req == NULL);
331
332 ecard_do_request(req);
333 complete(&ecard_completion);
334 }
335 }
336
337 /*
338 * Wake the expansion card daemon to action our request.
339 *
340 * FIXME: The test here is not sufficient to detect if the
341 * kcardd is running.
342 */
343 static void
344 ecard_call(struct ecard_request *req)
345 {
346 /*
347 * Make sure we have a context that is able to sleep.
348 */
349 if (current == &init_task || in_interrupt())
350 BUG();
351
352 if (ecard_pid <= 0)
353 ecard_pid = kernel_thread(ecard_task, NULL,
354 CLONE_FS | CLONE_FILES | CLONE_SIGHAND);
355
356 ecard_req = req;
357 wake_up(&ecard_wait);
358
359 /*
360 * Now wait for kecardd to run.
361 */
362 wait_for_completion(&ecard_completion);
363 }
364 #else
365 /*
366 * On 26-bit processors, we don't need the kcardd thread to access the
367 * expansion card loaders. We do it directly.
368 */
369 #define ecard_call(req) ecard_do_request(req)
370 #endif
371
372 /* ======================= Mid-level card control ===================== */
373
374 /*
375 * This function is responsible for resetting the expansion cards to a
376 * sensible state immediately prior to rebooting the system. This function
377 * has process state (keventd), so we can sleep.
378 *
379 * Possible "val" values here:
380 * SYS_RESTART - restarting system
381 * SYS_HALT - halting system
382 * SYS_POWER_OFF - powering down system
383 *
384 * We ignore all calls, unless it is a SYS_RESTART call - power down/halts
385 * will be followed by a SYS_RESTART if ctrl-alt-del is pressed again.
386 */
387 static int ecard_reboot(struct notifier_block *me, unsigned long val, void *v)
388 {
389 struct ecard_request req;
390
391 if (val != SYS_RESTART)
392 return 0;
393
394 /*
395 * Disable the expansion card interrupt
396 */
397 disable_irq(IRQ_EXPANSIONCARD);
398
399 /*
400 * If we have any expansion card loader code which will handle
401 * the reset for us, call it now.
402 */
403 req.req = req_reset_all;
404 ecard_call(&req);
405
406 /*
407 * Disable the expansion card interrupt again, just to be sure.
408 */
409 disable_irq(IRQ_EXPANSIONCARD);
410
411 /*
412 * Finally, reset the expansion card interrupt mask to
413 * all enable (RISC OS doesn't set this)
414 */
415 #ifdef HAS_EXPMASK
416 have_expmask = ~0;
417 __raw_writeb(have_expmask, EXPMASK_ENABLE);
418 #endif
419 return 0;
420 }
421
422 static struct notifier_block ecard_reboot_notifier = {
423 notifier_call: ecard_reboot,
424 };
425
426
427
428 static void
429 ecard_readbytes(void *addr, ecard_t *ec, int off, int len, int useld)
430 {
431 struct ecard_request req;
432
433 req.req = req_readbytes;
434 req.ec = ec;
435 req.address = off;
436 req.length = len;
437 req.use_loader = useld;
438 req.buffer = addr;
439
440 ecard_call(&req);
441 }
442
443 int ecard_readchunk(struct in_chunk_dir *cd, ecard_t *ec, int id, int num)
444 {
445 struct ex_chunk_dir excd;
446 int index = 16;
447 int useld = 0;
448
449 if (!ec->cid.cd)
450 return 0;
451
452 while(1) {
453 ecard_readbytes(&excd, ec, index, 8, useld);
454 index += 8;
455 if (c_id(&excd) == 0) {
456 if (!useld && ec->loader) {
457 useld = 1;
458 index = 0;
459 continue;
460 }
461 return 0;
462 }
463 if (c_id(&excd) == 0xf0) { /* link */
464 index = c_start(&excd);
465 continue;
466 }
467 if (c_id(&excd) == 0x80) { /* loader */
468 if (!ec->loader) {
469 ec->loader = (loader_t)kmalloc(c_len(&excd),
470 GFP_KERNEL);
471 if (ec->loader)
472 ecard_readbytes(ec->loader, ec,
473 (int)c_start(&excd),
474 c_len(&excd), useld);
475 else
476 return 0;
477 }
478 continue;
479 }
480 if (c_id(&excd) == id && num-- == 0)
481 break;
482 }
483
484 if (c_id(&excd) & 0x80) {
485 switch (c_id(&excd) & 0x70) {
486 case 0x70:
487 ecard_readbytes((unsigned char *)excd.d.string, ec,
488 (int)c_start(&excd), c_len(&excd),
489 useld);
490 break;
491 case 0x00:
492 break;
493 }
494 }
495 cd->start_offset = c_start(&excd);
496 memcpy(cd->d.string, excd.d.string, 256);
497 return 1;
498 }
499
500 /* ======================= Interrupt control ============================ */
501
502 static void ecard_def_irq_enable(ecard_t *ec, int irqnr)
503 {
504 #ifdef HAS_EXPMASK
505 if (irqnr < 4 && have_expmask) {
506 have_expmask |= 1 << irqnr;
507 __raw_writeb(have_expmask, EXPMASK_ENABLE);
508 }
509 #endif
510 }
511
512 static void ecard_def_irq_disable(ecard_t *ec, int irqnr)
513 {
514 #ifdef HAS_EXPMASK
515 if (irqnr < 4 && have_expmask) {
516 have_expmask &= ~(1 << irqnr);
517 __raw_writeb(have_expmask, EXPMASK_ENABLE);
518 }
519 #endif
520 }
521
522 static int ecard_def_irq_pending(ecard_t *ec)
523 {
524 return !ec->irqmask || ec->irqaddr[0] & ec->irqmask;
525 }
526
527 static void ecard_def_fiq_enable(ecard_t *ec, int fiqnr)
528 {
529 panic("ecard_def_fiq_enable called - impossible");
530 }
531
532 static void ecard_def_fiq_disable(ecard_t *ec, int fiqnr)
533 {
534 panic("ecard_def_fiq_disable called - impossible");
535 }
536
537 static int ecard_def_fiq_pending(ecard_t *ec)
538 {
539 return !ec->fiqmask || ec->fiqaddr[0] & ec->fiqmask;
540 }
541
542 static expansioncard_ops_t ecard_default_ops = {
543 ecard_def_irq_enable,
544 ecard_def_irq_disable,
545 ecard_def_irq_pending,
546 ecard_def_fiq_enable,
547 ecard_def_fiq_disable,
548 ecard_def_fiq_pending
549 };
550
551 /*
552 * Enable and disable interrupts from expansion cards.
553 * (interrupts are disabled for these functions).
554 *
555 * They are not meant to be called directly, but via enable/disable_irq.
556 */
557 static void ecard_enableirq(unsigned int irqnr)
558 {
559 ecard_t *ec = slot_to_ecard(irqnr - 32);
560
561 if (ec) {
562 if (!ec->ops)
563 ec->ops = &ecard_default_ops;
564
565 if (ec->claimed && ec->ops->irqenable)
566 ec->ops->irqenable(ec, irqnr);
567 else
568 printk(KERN_ERR "ecard: rejecting request to "
569 "enable IRQs for %d\n", irqnr);
570 }
571 }
572
573 static void ecard_disableirq(unsigned int irqnr)
574 {
575 ecard_t *ec = slot_to_ecard(irqnr - 32);
576
577 if (ec) {
578 if (!ec->ops)
579 ec->ops = &ecard_default_ops;
580
581 if (ec->ops && ec->ops->irqdisable)
582 ec->ops->irqdisable(ec, irqnr);
583 }
584 }
585
586 void ecard_enablefiq(unsigned int fiqnr)
587 {
588 ecard_t *ec = slot_to_ecard(fiqnr);
589
590 if (ec) {
591 if (!ec->ops)
592 ec->ops = &ecard_default_ops;
593
594 if (ec->claimed && ec->ops->fiqenable)
595 ec->ops->fiqenable(ec, fiqnr);
596 else
597 printk(KERN_ERR "ecard: rejecting request to "
598 "enable FIQs for %d\n", fiqnr);
599 }
600 }
601
602 void ecard_disablefiq(unsigned int fiqnr)
603 {
604 ecard_t *ec = slot_to_ecard(fiqnr);
605
606 if (ec) {
607 if (!ec->ops)
608 ec->ops = &ecard_default_ops;
609
610 if (ec->ops->fiqdisable)
611 ec->ops->fiqdisable(ec, fiqnr);
612 }
613 }
614
615 static void
616 ecard_dump_irq_state(ecard_t *ec)
617 {
618 printk(" %d: %sclaimed, ",
619 ec->slot_no,
620 ec->claimed ? "" : "not ");
621
622 if (ec->ops && ec->ops->irqpending &&
623 ec->ops != &ecard_default_ops)
624 printk("irq %spending\n",
625 ec->ops->irqpending(ec) ? "" : "not ");
626 else
627 printk("irqaddr %p, mask = %02X, status = %02X\n",
628 ec->irqaddr, ec->irqmask, *ec->irqaddr);
629 }
630
631 static void
632 ecard_check_lockup(void)
633 {
634 static int last, lockup;
635 ecard_t *ec;
636
637 /*
638 * If the timer interrupt has not run since the last million
639 * unrecognised expansion card interrupts, then there is
640 * something seriously wrong. Disable the expansion card
641 * interrupts so at least we can continue.
642 *
643 * Maybe we ought to start a timer to re-enable them some time
644 * later?
645 */
646 if (last == jiffies) {
647 lockup += 1;
648 if (lockup > 1000000) {
649 printk(KERN_ERR "\nInterrupt lockup detected - "
650 "disabling all expansion card interrupts\n");
651
652 disable_irq(IRQ_EXPANSIONCARD);
653
654 printk("Expansion card IRQ state:\n");
655
656 for (ec = cards; ec; ec = ec->next)
657 ecard_dump_irq_state(ec);
658 }
659 } else
660 lockup = 0;
661
662 /*
663 * If we did not recognise the source of this interrupt,
664 * warn the user, but don't flood the user with these messages.
665 */
666 if (!last || time_after(jiffies, last + 5*HZ)) {
667 last = jiffies;
668 printk(KERN_WARNING "Unrecognised interrupt from backplane\n");
669 }
670 }
671
672 static void
673 ecard_irq_noexpmask(int intr_no, void *dev_id, struct pt_regs *regs)
674 {
675 ecard_t *ec;
676 int called = 0;
677
678 for (ec = cards; ec; ec = ec->next) {
679 int pending;
680
681 if (!ec->claimed || ec->irq == NO_IRQ || ec->slot_no == 8)
682 continue;
683
684 if (ec->ops && ec->ops->irqpending)
685 pending = ec->ops->irqpending(ec);
686 else
687 pending = ecard_default_ops.irqpending(ec);
688
689 if (pending) {
690 do_ecard_IRQ(ec->irq, regs);
691 called ++;
692 }
693 }
694 cli();
695
696 if (called == 0)
697 ecard_check_lockup();
698 }
699
700 #ifdef HAS_EXPMASK
701 static unsigned char priority_masks[] =
702 {
703 0xf0, 0xf1, 0xf3, 0xf7, 0xff, 0xff, 0xff, 0xff
704 };
705
706 static unsigned char first_set[] =
707 {
708 0x00, 0x00, 0x01, 0x00, 0x02, 0x00, 0x01, 0x00,
709 0x03, 0x00, 0x01, 0x00, 0x02, 0x00, 0x01, 0x00
710 };
711
712 static void
713 ecard_irq_expmask(int intr_no, void *dev_id, struct pt_regs *regs)
714 {
715 const unsigned int statusmask = 15;
716 unsigned int status;
717
718 status = __raw_readb(EXPMASK_STATUS) & statusmask;
719 if (status) {
720 unsigned int slot;
721 ecard_t *ec;
722 again:
723 slot = first_set[status];
724 ec = slot_to_ecard(slot);
725 if (ec->claimed) {
726 unsigned int oldexpmask;
727 /*
728 * this ugly code is so that we can operate a
729 * prioritorising system:
730 *
731 * Card 0 highest priority
732 * Card 1
733 * Card 2
734 * Card 3 lowest priority
735 *
736 * Serial cards should go in 0/1, ethernet/scsi in 2/3
737 * otherwise you will lose serial data at high speeds!
738 */
739 oldexpmask = have_expmask;
740 have_expmask &= priority_masks[slot];
741 __raw_writeb(have_expmask, EXPMASK_ENABLE);
742 sti();
743 do_ecard_IRQ(ec->irq, regs);
744 cli();
745 have_expmask = oldexpmask;
746 __raw_writeb(have_expmask, EXPMASK_ENABLE);
747 status = __raw_readb(EXPMASK_STATUS) & statusmask;
748 if (status)
749 goto again;
750 } else {
751 printk(KERN_WARNING "card%d: interrupt from unclaimed "
752 "card???\n", slot);
753 have_expmask &= ~(1 << slot);
754 __raw_writeb(have_expmask, EXPMASK_ENABLE);
755 }
756 } else
757 printk(KERN_WARNING "Wild interrupt from backplane (masks)\n");
758 }
759
760 static void __init
761 ecard_probeirqhw(void)
762 {
763 ecard_t *ec;
764 int found;
765
766 __raw_writeb(0x00, EXPMASK_ENABLE);
767 __raw_writeb(0xff, EXPMASK_STATUS);
768 found = (__raw_readb(EXPMASK_STATUS) & 15) == 0;
769 __raw_writeb(0xff, EXPMASK_ENABLE);
770
771 if (!found)
772 return;
773
774 printk(KERN_DEBUG "Expansion card interrupt "
775 "management hardware found\n");
776
777 irqexpansioncard.handler = ecard_irq_expmask;
778
779 /* for each card present, set a bit to '1' */
780 have_expmask = 0x80000000;
781
782 for (ec = cards; ec; ec = ec->next)
783 have_expmask |= 1 << ec->slot_no;
784
785 __raw_writeb(have_expmask, EXPMASK_ENABLE);
786 }
787 #else
788 #define ecard_probeirqhw()
789 #endif
790
791 #ifndef IO_EC_MEMC8_BASE
792 #define IO_EC_MEMC8_BASE 0
793 #endif
794
795 unsigned int ecard_address(ecard_t *ec, card_type_t type, card_speed_t speed)
796 {
797 unsigned long address = 0;
798 int slot = ec->slot_no;
799
800 if (ec->slot_no == 8)
801 return IO_EC_MEMC8_BASE;
802
803 ectcr &= ~(1 << slot);
804
805 switch (type) {
806 case ECARD_MEMC:
807 if (slot < 4)
808 address = IO_EC_MEMC_BASE + (slot << 12);
809 break;
810
811 case ECARD_IOC:
812 if (slot < 4)
813 address = IO_EC_IOC_BASE + (slot << 12);
814 #ifdef IO_EC_IOC4_BASE
815 else
816 address = IO_EC_IOC4_BASE + ((slot - 4) << 12);
817 #endif
818 if (address)
819 address += speed << 17;
820 break;
821
822 #ifdef IO_EC_EASI_BASE
823 case ECARD_EASI:
824 address = IO_EC_EASI_BASE + (slot << 22);
825 if (speed == ECARD_FAST)
826 ectcr |= 1 << slot;
827 break;
828 #endif
829 default:
830 break;
831 }
832
833 #ifdef IOMD_ECTCR
834 iomd_writeb(ectcr, IOMD_ECTCR);
835 #endif
836 return address;
837 }
838
839 static int ecard_prints(char *buffer, ecard_t *ec)
840 {
841 char *start = buffer;
842
843 buffer += sprintf(buffer, " %d: %s ", ec->slot_no,
844 ec->type == ECARD_EASI ? "EASI" : " ");
845
846 if (ec->cid.id == 0) {
847 struct in_chunk_dir incd;
848
849 buffer += sprintf(buffer, "[%04X:%04X] ",
850 ec->cid.manufacturer, ec->cid.product);
851
852 if (!ec->card_desc && ec->cid.cd &&
853 ecard_readchunk(&incd, ec, 0xf5, 0)) {
854 ec->card_desc = kmalloc(strlen(incd.d.string)+1, GFP_KERNEL);
855
856 if (ec->card_desc)
857 strcpy((char *)ec->card_desc, incd.d.string);
858 }
859
860 buffer += sprintf(buffer, "%s\n", ec->card_desc ? ec->card_desc : "*unknown*");
861 } else
862 buffer += sprintf(buffer, "Simple card %d\n", ec->cid.id);
863
864 return buffer - start;
865 }
866
867 static int get_ecard_dev_info(char *buf, char **start, off_t pos, int count)
868 {
869 ecard_t *ec = cards;
870 off_t at = 0;
871 int len, cnt;
872
873 cnt = 0;
874 while (ec && count > cnt) {
875 len = ecard_prints(buf, ec);
876 at += len;
877 if (at >= pos) {
878 if (!*start) {
879 *start = buf + (pos - (at - len));
880 cnt = at - pos;
881 } else
882 cnt += len;
883 buf += len;
884 }
885 ec = ec->next;
886 }
887 return (count > cnt) ? cnt : count;
888 }
889
890 static struct proc_dir_entry *proc_bus_ecard_dir = NULL;
891
892 static void ecard_proc_init(void)
893 {
894 proc_bus_ecard_dir = proc_mkdir("ecard", proc_bus);
895 create_proc_info_entry("devices", 0, proc_bus_ecard_dir,
896 get_ecard_dev_info);
897 }
898
899 /*
900 * Probe for an expansion card.
901 *
902 * If bit 1 of the first byte of the card is set, then the
903 * card does not exist.
904 */
905 static int __init
906 ecard_probe(int slot, card_type_t type)
907 {
908 ecard_t **ecp;
909 ecard_t *ec;
910 struct ex_ecid cid;
911 int i, rc = -ENOMEM;
912
913 ec = kmalloc(sizeof(ecard_t), GFP_KERNEL);
914 if (!ec)
915 goto nomem;
916
917 memset(ec, 0, sizeof(ecard_t));
918
919 ec->slot_no = slot;
920 ec->type = type;
921 ec->irq = NO_IRQ;
922 ec->fiq = NO_IRQ;
923 ec->dma = NO_DMA;
924 ec->card_desc = NULL;
925 ec->ops = &ecard_default_ops;
926
927 rc = -ENODEV;
928 if ((ec->podaddr = ecard_address(ec, type, ECARD_SYNC)) == 0)
929 goto nodev;
930
931 cid.r_zero = 1;
932 ecard_readbytes(&cid, ec, 0, 16, 0);
933 if (cid.r_zero)
934 goto nodev;
935
936 ec->cid.id = cid.r_id;
937 ec->cid.cd = cid.r_cd;
938 ec->cid.is = cid.r_is;
939 ec->cid.w = cid.r_w;
940 ec->cid.manufacturer = ecard_getu16(cid.r_manu);
941 ec->cid.product = ecard_getu16(cid.r_prod);
942 ec->cid.country = cid.r_country;
943 ec->cid.irqmask = cid.r_irqmask;
944 ec->cid.irqoff = ecard_gets24(cid.r_irqoff);
945 ec->cid.fiqmask = cid.r_fiqmask;
946 ec->cid.fiqoff = ecard_gets24(cid.r_fiqoff);
947 ec->fiqaddr =
948 ec->irqaddr = (unsigned char *)ioaddr(ec->podaddr);
949
950 if (ec->cid.is) {
951 ec->irqmask = ec->cid.irqmask;
952 ec->irqaddr += ec->cid.irqoff;
953 ec->fiqmask = ec->cid.fiqmask;
954 ec->fiqaddr += ec->cid.fiqoff;
955 } else {
956 ec->irqmask = 1;
957 ec->fiqmask = 4;
958 }
959
960 for (i = 0; i < sizeof(blacklist) / sizeof(*blacklist); i++)
961 if (blacklist[i].manufacturer == ec->cid.manufacturer &&
962 blacklist[i].product == ec->cid.product) {
963 ec->card_desc = blacklist[i].type;
964 break;
965 }
966
967 ec->irq = 32 + slot;
968 #ifdef IO_EC_MEMC8_BASE
969 if (slot == 8)
970 ec->irq = 11;
971 #endif
972 /*
973 * hook the interrupt handlers
974 */
975 if (ec->irq != 0 && ec->irq >= 32) {
976 irq_desc[ec->irq].mask_ack = ecard_disableirq;
977 irq_desc[ec->irq].mask = ecard_disableirq;
978 irq_desc[ec->irq].unmask = ecard_enableirq;
979 irq_desc[ec->irq].valid = 1;
980 }
981
982 #ifdef CONFIG_ARCH_RPC
983 /* On RiscPC, only first two slots have DMA capability */
984 if (slot < 2)
985 ec->dma = 2 + slot;
986 #endif
987
988 for (ecp = &cards; *ecp; ecp = &(*ecp)->next);
989
990 *ecp = ec;
991 slot_to_expcard[slot] = ec;
992 return 0;
993
994 nodev:
995 kfree(ec);
996 nomem:
997 return rc;
998 }
999
1000 static ecard_t *finding_pos;
1001
1002 void ecard_startfind(void)
1003 {
1004 finding_pos = NULL;
1005 }
1006
1007 ecard_t *ecard_find(int cid, const card_ids *cids)
1008 {
1009 if (!finding_pos)
1010 finding_pos = cards;
1011 else
1012 finding_pos = finding_pos->next;
1013
1014 for (; finding_pos; finding_pos = finding_pos->next) {
1015 if (finding_pos->claimed)
1016 continue;
1017
1018 if (!cids) {
1019 if ((finding_pos->cid.id ^ cid) == 0)
1020 break;
1021 } else {
1022 unsigned int manufacturer, product;
1023 int i;
1024
1025 manufacturer = finding_pos->cid.manufacturer;
1026 product = finding_pos->cid.product;
1027
1028 for (i = 0; cids[i].manufacturer != 65535; i++)
1029 if (manufacturer == cids[i].manufacturer &&
1030 product == cids[i].product)
1031 break;
1032
1033 if (cids[i].manufacturer != 65535)
1034 break;
1035 }
1036 }
1037
1038 return finding_pos;
1039 }
1040
1041 static void __init ecard_free_all(void)
1042 {
1043 ecard_t *ec, *ecn;
1044
1045 for (ec = cards; ec; ec = ecn) {
1046 ecn = ec->next;
1047
1048 kfree(ec);
1049 }
1050
1051 cards = NULL;
1052
1053 memset(slot_to_expcard, 0, sizeof(slot_to_expcard));
1054 }
1055
1056 /*
1057 * Initialise the expansion card system.
1058 * Locate all hardware - interrupt management and
1059 * actual cards.
1060 */
1061 void __init ecard_init(void)
1062 {
1063 int slot;
1064
1065 /*
1066 * Register our reboot notifier
1067 */
1068 register_reboot_notifier(&ecard_reboot_notifier);
1069
1070 #ifdef CONFIG_CPU_32
1071 init_waitqueue_head(&ecard_wait);
1072 #endif
1073
1074 printk("Probing expansion cards\n");
1075
1076 for (slot = 0; slot < 8; slot ++) {
1077 if (ecard_probe(slot, ECARD_EASI) == -ENODEV)
1078 ecard_probe(slot, ECARD_IOC);
1079 }
1080
1081 #ifdef IO_EC_MEMC8_BASE
1082 ecard_probe(8, ECARD_IOC);
1083 #endif
1084
1085 ecard_probeirqhw();
1086
1087 if (setup_arm_irq(IRQ_EXPANSIONCARD, &irqexpansioncard)) {
1088 printk(KERN_ERR "Unable to claim IRQ%d for expansion cards\n",
1089 IRQ_EXPANSIONCARD);
1090 ecard_free_all();
1091 }
1092
1093 ecard_proc_init();
1094 }
1095
1096 EXPORT_SYMBOL(ecard_startfind);
1097 EXPORT_SYMBOL(ecard_find);
1098 EXPORT_SYMBOL(ecard_readchunk);
1099 EXPORT_SYMBOL(ecard_address);
1100