v2.4.8 -> v2.4.8.1
[opensuse:kernel.git] / 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);