64d5ba1a1337627559f9f9686894a82c03e920c9
[linux-2.6.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/module.h>
31 #include <linux/kernel.h>
32 #include <linux/types.h>
33 #include <linux/sched.h>
34 #include <linux/interrupt.h>
35 #include <linux/completion.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/device.h>
41 #include <linux/init.h>
42 #include <linux/mutex.h>
43 #include <linux/kthread.h>
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;
210 static DEFINE_MUTEX(ecard_mutex);
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         /*
268          * Allocate a mm.  We're not a lazy-TLB kernel task since we need
269          * to set page table entries where the user space would be.  Note
270          * that this also creates the page tables.  Failure is not an
271          * option here.
272          */
273         if (ecard_init_mm())
274                 panic("kecardd: unable to alloc mm\n");
275
276         while (1) {
277                 struct ecard_request *req;
278
279                 wait_event_interruptible(ecard_wait, ecard_req != NULL);
280
281                 req = xchg(&ecard_req, NULL);
282                 if (req != NULL) {
283                         req->fn(req);
284                         complete(req->complete);
285                 }
286         }
287 }
288
289 /*
290  * Wake the expansion card daemon to action our request.
291  *
292  * FIXME: The test here is not sufficient to detect if the
293  * kcardd is running.
294  */
295 static void ecard_call(struct ecard_request *req)
296 {
297         DECLARE_COMPLETION_ONSTACK(completion);
298
299         req->complete = &completion;
300
301         mutex_lock(&ecard_mutex);
302         ecard_req = req;
303         wake_up(&ecard_wait);
304
305         /*
306          * Now wait for kecardd to run.
307          */
308         wait_for_completion(&completion);
309         mutex_unlock(&ecard_mutex);
310 }
311
312 /* ======================= Mid-level card control ===================== */
313
314 static void
315 ecard_readbytes(void *addr, ecard_t *ec, int off, int len, int useld)
316 {
317         struct ecard_request req;
318
319         req.fn          = ecard_task_readbytes;
320         req.ec          = ec;
321         req.address     = off;
322         req.length      = len;
323         req.use_loader  = useld;
324         req.buffer      = addr;
325
326         ecard_call(&req);
327 }
328
329 int ecard_readchunk(struct in_chunk_dir *cd, ecard_t *ec, int id, int num)
330 {
331         struct ex_chunk_dir excd;
332         int index = 16;
333         int useld = 0;
334
335         if (!ec->cid.cd)
336                 return 0;
337
338         while(1) {
339                 ecard_readbytes(&excd, ec, index, 8, useld);
340                 index += 8;
341                 if (c_id(&excd) == 0) {
342                         if (!useld && ec->loader) {
343                                 useld = 1;
344                                 index = 0;
345                                 continue;
346                         }
347                         return 0;
348                 }
349                 if (c_id(&excd) == 0xf0) { /* link */
350                         index = c_start(&excd);
351                         continue;
352                 }
353                 if (c_id(&excd) == 0x80) { /* loader */
354                         if (!ec->loader) {
355                                 ec->loader = kmalloc(c_len(&excd),
356                                                                GFP_KERNEL);
357                                 if (ec->loader)
358                                         ecard_readbytes(ec->loader, ec,
359                                                         (int)c_start(&excd),
360                                                         c_len(&excd), useld);
361                                 else
362                                         return 0;
363                         }
364                         continue;
365                 }
366                 if (c_id(&excd) == id && num-- == 0)
367                         break;
368         }
369
370         if (c_id(&excd) & 0x80) {
371                 switch (c_id(&excd) & 0x70) {
372                 case 0x70:
373                         ecard_readbytes((unsigned char *)excd.d.string, ec,
374                                         (int)c_start(&excd), c_len(&excd),
375                                         useld);
376                         break;
377                 case 0x00:
378                         break;
379                 }
380         }
381         cd->start_offset = c_start(&excd);
382         memcpy(cd->d.string, excd.d.string, 256);
383         return 1;
384 }
385
386 /* ======================= Interrupt control ============================ */
387
388 static void ecard_def_irq_enable(ecard_t *ec, int irqnr)
389 {
390 #ifdef HAS_EXPMASK
391         if (irqnr < 4 && have_expmask) {
392                 have_expmask |= 1 << irqnr;
393                 __raw_writeb(have_expmask, EXPMASK_ENABLE);
394         }
395 #endif
396 }
397
398 static void ecard_def_irq_disable(ecard_t *ec, int irqnr)
399 {
400 #ifdef HAS_EXPMASK
401         if (irqnr < 4 && have_expmask) {
402                 have_expmask &= ~(1 << irqnr);
403                 __raw_writeb(have_expmask, EXPMASK_ENABLE);
404         }
405 #endif
406 }
407
408 static int ecard_def_irq_pending(ecard_t *ec)
409 {
410         return !ec->irqmask || readb(ec->irqaddr) & ec->irqmask;
411 }
412
413 static void ecard_def_fiq_enable(ecard_t *ec, int fiqnr)
414 {
415         panic("ecard_def_fiq_enable called - impossible");
416 }
417
418 static void ecard_def_fiq_disable(ecard_t *ec, int fiqnr)
419 {
420         panic("ecard_def_fiq_disable called - impossible");
421 }
422
423 static int ecard_def_fiq_pending(ecard_t *ec)
424 {
425         return !ec->fiqmask || readb(ec->fiqaddr) & ec->fiqmask;
426 }
427
428 static expansioncard_ops_t ecard_default_ops = {
429         ecard_def_irq_enable,
430         ecard_def_irq_disable,
431         ecard_def_irq_pending,
432         ecard_def_fiq_enable,
433         ecard_def_fiq_disable,
434         ecard_def_fiq_pending
435 };
436
437 /*
438  * Enable and disable interrupts from expansion cards.
439  * (interrupts are disabled for these functions).
440  *
441  * They are not meant to be called directly, but via enable/disable_irq.
442  */
443 static void ecard_irq_unmask(unsigned int irqnr)
444 {
445         ecard_t *ec = slot_to_ecard(irqnr - 32);
446
447         if (ec) {
448                 if (!ec->ops)
449                         ec->ops = &ecard_default_ops;
450
451                 if (ec->claimed && ec->ops->irqenable)
452                         ec->ops->irqenable(ec, irqnr);
453                 else
454                         printk(KERN_ERR "ecard: rejecting request to "
455                                 "enable IRQs for %d\n", irqnr);
456         }
457 }
458
459 static void ecard_irq_mask(unsigned int irqnr)
460 {
461         ecard_t *ec = slot_to_ecard(irqnr - 32);
462
463         if (ec) {
464                 if (!ec->ops)
465                         ec->ops = &ecard_default_ops;
466
467                 if (ec->ops && ec->ops->irqdisable)
468                         ec->ops->irqdisable(ec, irqnr);
469         }
470 }
471
472 static struct irq_chip ecard_chip = {
473         .name   = "ECARD",
474         .ack    = ecard_irq_mask,
475         .mask   = ecard_irq_mask,
476         .unmask = ecard_irq_unmask,
477 };
478
479 void ecard_enablefiq(unsigned int fiqnr)
480 {
481         ecard_t *ec = slot_to_ecard(fiqnr);
482
483         if (ec) {
484                 if (!ec->ops)
485                         ec->ops = &ecard_default_ops;
486
487                 if (ec->claimed && ec->ops->fiqenable)
488                         ec->ops->fiqenable(ec, fiqnr);
489                 else
490                         printk(KERN_ERR "ecard: rejecting request to "
491                                 "enable FIQs for %d\n", fiqnr);
492         }
493 }
494
495 void ecard_disablefiq(unsigned int fiqnr)
496 {
497         ecard_t *ec = slot_to_ecard(fiqnr);
498
499         if (ec) {
500                 if (!ec->ops)
501                         ec->ops = &ecard_default_ops;
502
503                 if (ec->ops->fiqdisable)
504                         ec->ops->fiqdisable(ec, fiqnr);
505         }
506 }
507
508 static void ecard_dump_irq_state(void)
509 {
510         ecard_t *ec;
511
512         printk("Expansion card IRQ state:\n");
513
514         for (ec = cards; ec; ec = ec->next) {
515                 if (ec->slot_no == 8)
516                         continue;
517
518                 printk("  %d: %sclaimed, ",
519                        ec->slot_no, ec->claimed ? "" : "not ");
520
521                 if (ec->ops && ec->ops->irqpending &&
522                     ec->ops != &ecard_default_ops)
523                         printk("irq %spending\n",
524                                ec->ops->irqpending(ec) ? "" : "not ");
525                 else
526                         printk("irqaddr %p, mask = %02X, status = %02X\n",
527                                ec->irqaddr, ec->irqmask, readb(ec->irqaddr));
528         }
529 }
530
531 static void ecard_check_lockup(struct irq_desc *desc)
532 {
533         static unsigned long last;
534         static int lockup;
535
536         /*
537          * If the timer interrupt has not run since the last million
538          * unrecognised expansion card interrupts, then there is
539          * something seriously wrong.  Disable the expansion card
540          * interrupts so at least we can continue.
541          *
542          * Maybe we ought to start a timer to re-enable them some time
543          * later?
544          */
545         if (last == jiffies) {
546                 lockup += 1;
547                 if (lockup > 1000000) {
548                         printk(KERN_ERR "\nInterrupt lockup detected - "
549                                "disabling all expansion card interrupts\n");
550
551                         desc->chip->mask(IRQ_EXPANSIONCARD);
552                         ecard_dump_irq_state();
553                 }
554         } else
555                 lockup = 0;
556
557         /*
558          * If we did not recognise the source of this interrupt,
559          * warn the user, but don't flood the user with these messages.
560          */
561         if (!last || time_after(jiffies, last + 5*HZ)) {
562                 last = jiffies;
563                 printk(KERN_WARNING "Unrecognised interrupt from backplane\n");
564                 ecard_dump_irq_state();
565         }
566 }
567
568 static void
569 ecard_irq_handler(unsigned int irq, struct irq_desc *desc)
570 {
571         ecard_t *ec;
572         int called = 0;
573
574         desc->chip->mask(irq);
575         for (ec = cards; ec; ec = ec->next) {
576                 int pending;
577
578                 if (!ec->claimed || ec->irq == NO_IRQ || ec->slot_no == 8)
579                         continue;
580
581                 if (ec->ops && ec->ops->irqpending)
582                         pending = ec->ops->irqpending(ec);
583                 else
584                         pending = ecard_default_ops.irqpending(ec);
585
586                 if (pending) {
587                         struct irq_desc *d = irq_desc + ec->irq;
588                         desc_handle_irq(ec->irq, d);
589                         called ++;
590                 }
591         }
592         desc->chip->unmask(irq);
593
594         if (called == 0)
595                 ecard_check_lockup(desc);
596 }
597
598 #ifdef HAS_EXPMASK
599 static unsigned char priority_masks[] =
600 {
601         0xf0, 0xf1, 0xf3, 0xf7, 0xff, 0xff, 0xff, 0xff
602 };
603
604 static unsigned char first_set[] =
605 {
606         0x00, 0x00, 0x01, 0x00, 0x02, 0x00, 0x01, 0x00,
607         0x03, 0x00, 0x01, 0x00, 0x02, 0x00, 0x01, 0x00
608 };
609
610 static void
611 ecard_irqexp_handler(unsigned int irq, struct irq_desc *desc)
612 {
613         const unsigned int statusmask = 15;
614         unsigned int status;
615
616         status = __raw_readb(EXPMASK_STATUS) & statusmask;
617         if (status) {
618                 unsigned int slot = first_set[status];
619                 ecard_t *ec = slot_to_ecard(slot);
620
621                 if (ec->claimed) {
622                         struct irq_desc *d = irq_desc + ec->irq;
623                         /*
624                          * this ugly code is so that we can operate a
625                          * prioritorising system:
626                          *
627                          * Card 0       highest priority
628                          * Card 1
629                          * Card 2
630                          * Card 3       lowest priority
631                          *
632                          * Serial cards should go in 0/1, ethernet/scsi in 2/3
633                          * otherwise you will lose serial data at high speeds!
634                          */
635                         desc_handle_irq(ec->irq, d);
636                 } else {
637                         printk(KERN_WARNING "card%d: interrupt from unclaimed "
638                                "card???\n", slot);
639                         have_expmask &= ~(1 << slot);
640                         __raw_writeb(have_expmask, EXPMASK_ENABLE);
641                 }
642         } else
643                 printk(KERN_WARNING "Wild interrupt from backplane (masks)\n");
644 }
645
646 static int __init ecard_probeirqhw(void)
647 {
648         ecard_t *ec;
649         int found;
650
651         __raw_writeb(0x00, EXPMASK_ENABLE);
652         __raw_writeb(0xff, EXPMASK_STATUS);
653         found = (__raw_readb(EXPMASK_STATUS) & 15) == 0;
654         __raw_writeb(0xff, EXPMASK_ENABLE);
655
656         if (found) {
657                 printk(KERN_DEBUG "Expansion card interrupt "
658                        "management hardware found\n");
659
660                 /* for each card present, set a bit to '1' */
661                 have_expmask = 0x80000000;
662
663                 for (ec = cards; ec; ec = ec->next)
664                         have_expmask |= 1 << ec->slot_no;
665
666                 __raw_writeb(have_expmask, EXPMASK_ENABLE);
667         }
668
669         return found;
670 }
671 #else
672 #define ecard_irqexp_handler NULL
673 #define ecard_probeirqhw() (0)
674 #endif
675
676 #ifndef IO_EC_MEMC8_BASE
677 #define IO_EC_MEMC8_BASE 0
678 #endif
679
680 unsigned int __ecard_address(ecard_t *ec, card_type_t type, card_speed_t speed)
681 {
682         unsigned long address = 0;
683         int slot = ec->slot_no;
684
685         if (ec->slot_no == 8)
686                 return IO_EC_MEMC8_BASE;
687
688         ectcr &= ~(1 << slot);
689
690         switch (type) {
691         case ECARD_MEMC:
692                 if (slot < 4)
693                         address = IO_EC_MEMC_BASE + (slot << 12);
694                 break;
695
696         case ECARD_IOC:
697                 if (slot < 4)
698                         address = IO_EC_IOC_BASE + (slot << 12);
699 #ifdef IO_EC_IOC4_BASE
700                 else
701                         address = IO_EC_IOC4_BASE + ((slot - 4) << 12);
702 #endif
703                 if (address)
704                         address +=  speed << 17;
705                 break;
706
707 #ifdef IO_EC_EASI_BASE
708         case ECARD_EASI:
709                 address = IO_EC_EASI_BASE + (slot << 22);
710                 if (speed == ECARD_FAST)
711                         ectcr |= 1 << slot;
712                 break;
713 #endif
714         default:
715                 break;
716         }
717
718 #ifdef IOMD_ECTCR
719         iomd_writeb(ectcr, IOMD_ECTCR);
720 #endif
721         return address;
722 }
723
724 static int ecard_prints(char *buffer, ecard_t *ec)
725 {
726         char *start = buffer;
727
728         buffer += sprintf(buffer, "  %d: %s ", ec->slot_no,
729                           ec->type == ECARD_EASI ? "EASI" : "    ");
730
731         if (ec->cid.id == 0) {
732                 struct in_chunk_dir incd;
733
734                 buffer += sprintf(buffer, "[%04X:%04X] ",
735                         ec->cid.manufacturer, ec->cid.product);
736
737                 if (!ec->card_desc && ec->cid.cd &&
738                     ecard_readchunk(&incd, ec, 0xf5, 0)) {
739                         ec->card_desc = kmalloc(strlen(incd.d.string)+1, GFP_KERNEL);
740
741                         if (ec->card_desc)
742                                 strcpy((char *)ec->card_desc, incd.d.string);
743                 }
744
745                 buffer += sprintf(buffer, "%s\n", ec->card_desc ? ec->card_desc : "*unknown*");
746         } else
747                 buffer += sprintf(buffer, "Simple card %d\n", ec->cid.id);
748
749         return buffer - start;
750 }
751
752 static int get_ecard_dev_info(char *buf, char **start, off_t pos, int count)
753 {
754         ecard_t *ec = cards;
755         off_t at = 0;
756         int len, cnt;
757
758         cnt = 0;
759         while (ec && count > cnt) {
760                 len = ecard_prints(buf, ec);
761                 at += len;
762                 if (at >= pos) {
763                         if (!*start) {
764                                 *start = buf + (pos - (at - len));
765                                 cnt = at - pos;
766                         } else
767                                 cnt += len;
768                         buf += len;
769                 }
770                 ec = ec->next;
771         }
772         return (count > cnt) ? cnt : count;
773 }
774
775 static struct proc_dir_entry *proc_bus_ecard_dir = NULL;
776
777 static void ecard_proc_init(void)
778 {
779         proc_bus_ecard_dir = proc_mkdir("ecard", proc_bus);
780         create_proc_info_entry("devices", 0, proc_bus_ecard_dir,
781                 get_ecard_dev_info);
782 }
783
784 #define ec_set_resource(ec,nr,st,sz)                            \
785         do {                                                    \
786                 (ec)->resource[nr].name = ec->dev.bus_id;       \
787                 (ec)->resource[nr].start = st;                  \
788                 (ec)->resource[nr].end = (st) + (sz) - 1;       \
789                 (ec)->resource[nr].flags = IORESOURCE_MEM;      \
790         } while (0)
791
792 static void __init ecard_free_card(struct expansion_card *ec)
793 {
794         int i;
795
796         for (i = 0; i < ECARD_NUM_RESOURCES; i++)
797                 if (ec->resource[i].flags)
798                         release_resource(&ec->resource[i]);
799
800         kfree(ec);
801 }
802
803 static struct expansion_card *__init ecard_alloc_card(int type, int slot)
804 {
805         struct expansion_card *ec;
806         unsigned long base;
807         int i;
808
809         ec = kzalloc(sizeof(ecard_t), GFP_KERNEL);
810         if (!ec) {
811                 ec = ERR_PTR(-ENOMEM);
812                 goto nomem;
813         }
814
815         ec->slot_no = slot;
816         ec->type = type;
817         ec->irq = NO_IRQ;
818         ec->fiq = NO_IRQ;
819         ec->dma = NO_DMA;
820         ec->ops = &ecard_default_ops;
821
822         snprintf(ec->dev.bus_id, sizeof(ec->dev.bus_id), "ecard%d", slot);
823         ec->dev.parent = NULL;
824         ec->dev.bus = &ecard_bus_type;
825         ec->dev.dma_mask = &ec->dma_mask;
826         ec->dma_mask = (u64)0xffffffff;
827         ec->dev.coherent_dma_mask = ec->dma_mask;
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
868 static ssize_t ecard_show_irq(struct device *dev, struct device_attribute *attr, char *buf)
869 {
870         struct expansion_card *ec = ECARD_DEV(dev);
871         return sprintf(buf, "%u\n", ec->irq);
872 }
873
874 static ssize_t ecard_show_dma(struct device *dev, struct device_attribute *attr, char *buf)
875 {
876         struct expansion_card *ec = ECARD_DEV(dev);
877         return sprintf(buf, "%u\n", ec->dma);
878 }
879
880 static ssize_t ecard_show_resources(struct device *dev, struct device_attribute *attr, char *buf)
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, "%08x %08x %08lx\n",
888                                 ec->resource[i].start,
889                                 ec->resource[i].end,
890                                 ec->resource[i].flags);
891
892         return str - buf;
893 }
894
895 static ssize_t ecard_show_vendor(struct device *dev, struct device_attribute *attr, char *buf)
896 {
897         struct expansion_card *ec = ECARD_DEV(dev);
898         return sprintf(buf, "%u\n", ec->cid.manufacturer);
899 }
900
901 static ssize_t ecard_show_device(struct device *dev, struct device_attribute *attr, char *buf)
902 {
903         struct expansion_card *ec = ECARD_DEV(dev);
904         return sprintf(buf, "%u\n", ec->cid.product);
905 }
906
907 static ssize_t ecard_show_type(struct device *dev, struct device_attribute *attr, char *buf)
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 < ARRAY_SIZE(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, handle_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         struct task_struct *task;
1062         int slot, irqhw;
1063
1064         task = kthread_run(ecard_task, NULL, "kecardd");
1065         if (IS_ERR(task)) {
1066                 printk(KERN_ERR "Ecard: unable to create kernel thread: %ld\n",
1067                        PTR_ERR(task));
1068                 return PTR_ERR(task);
1069         }
1070
1071         printk("Probing expansion cards\n");
1072
1073         for (slot = 0; slot < 8; slot ++) {
1074                 if (ecard_probe(slot, ECARD_EASI) == -ENODEV)
1075                         ecard_probe(slot, ECARD_IOC);
1076         }
1077
1078 #ifdef IO_EC_MEMC8_BASE
1079         ecard_probe(8, ECARD_IOC);
1080 #endif
1081
1082         irqhw = ecard_probeirqhw();
1083
1084         set_irq_chained_handler(IRQ_EXPANSIONCARD,
1085                                 irqhw ? ecard_irqexp_handler : ecard_irq_handler);
1086
1087         ecard_proc_init();
1088
1089         return 0;
1090 }
1091
1092 subsys_initcall(ecard_init);
1093
1094 /*
1095  *      ECARD "bus"
1096  */
1097 static const struct ecard_id *
1098 ecard_match_device(const struct ecard_id *ids, struct expansion_card *ec)
1099 {
1100         int i;
1101
1102         for (i = 0; ids[i].manufacturer != 65535; i++)
1103                 if (ec->cid.manufacturer == ids[i].manufacturer &&
1104                     ec->cid.product == ids[i].product)
1105                         return ids + i;
1106
1107         return NULL;
1108 }
1109
1110 static int ecard_drv_probe(struct device *dev)
1111 {
1112         struct expansion_card *ec = ECARD_DEV(dev);
1113         struct ecard_driver *drv = ECARD_DRV(dev->driver);
1114         const struct ecard_id *id;
1115         int ret;
1116
1117         id = ecard_match_device(drv->id_table, ec);
1118
1119         ecard_claim(ec);
1120         ret = drv->probe(ec, id);
1121         if (ret)
1122                 ecard_release(ec);
1123         return ret;
1124 }
1125
1126 static int ecard_drv_remove(struct device *dev)
1127 {
1128         struct expansion_card *ec = ECARD_DEV(dev);
1129         struct ecard_driver *drv = ECARD_DRV(dev->driver);
1130
1131         drv->remove(ec);
1132         ecard_release(ec);
1133
1134         return 0;
1135 }
1136
1137 /*
1138  * Before rebooting, we must make sure that the expansion card is in a
1139  * sensible state, so it can be re-detected.  This means that the first
1140  * page of the ROM must be visible.  We call the expansion cards reset
1141  * handler, if any.
1142  */
1143 static void ecard_drv_shutdown(struct device *dev)
1144 {
1145         struct expansion_card *ec = ECARD_DEV(dev);
1146         struct ecard_driver *drv = ECARD_DRV(dev->driver);
1147         struct ecard_request req;
1148
1149         if (dev->driver) {
1150                 if (drv->shutdown)
1151                         drv->shutdown(ec);
1152                 ecard_release(ec);
1153         }
1154
1155         /*
1156          * If this card has a loader, call the reset handler.
1157          */
1158         if (ec->loader) {
1159                 req.fn = ecard_task_reset;
1160                 req.ec = ec;
1161                 ecard_call(&req);
1162         }
1163 }
1164
1165 int ecard_register_driver(struct ecard_driver *drv)
1166 {
1167         drv->drv.bus = &ecard_bus_type;
1168
1169         return driver_register(&drv->drv);
1170 }
1171
1172 void ecard_remove_driver(struct ecard_driver *drv)
1173 {
1174         driver_unregister(&drv->drv);
1175 }
1176
1177 static int ecard_match(struct device *_dev, struct device_driver *_drv)
1178 {
1179         struct expansion_card *ec = ECARD_DEV(_dev);
1180         struct ecard_driver *drv = ECARD_DRV(_drv);
1181         int ret;
1182
1183         if (drv->id_table) {
1184                 ret = ecard_match_device(drv->id_table, ec) != NULL;
1185         } else {
1186                 ret = ec->cid.id == drv->id;
1187         }
1188
1189         return ret;
1190 }
1191
1192 struct bus_type ecard_bus_type = {
1193         .name           = "ecard",
1194         .dev_attrs      = ecard_dev_attrs,
1195         .match          = ecard_match,
1196         .probe          = ecard_drv_probe,
1197         .remove         = ecard_drv_remove,
1198         .shutdown       = ecard_drv_shutdown,
1199 };
1200
1201 static int ecard_bus_init(void)
1202 {
1203         return bus_register(&ecard_bus_type);
1204 }
1205
1206 postcore_initcall(ecard_bus_init);
1207
1208 EXPORT_SYMBOL(ecard_readchunk);
1209 EXPORT_SYMBOL(__ecard_address);
1210 EXPORT_SYMBOL(ecard_register_driver);
1211 EXPORT_SYMBOL(ecard_remove_driver);
1212 EXPORT_SYMBOL(ecard_bus_type);