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1/*
2 * linux/arch/arm/kernel/ecard.c
3 *
4 * Copyright 1995-2001 Russell King
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 *
10 * Find all installed expansion cards, and handle interrupts from them.
11 *
12 * Created from information from Acorns RiscOS3 PRMs
13 *
14 * 08-Dec-1996 RMK Added code for the 9'th expansion card - the ether
15 * podule slot.
16 * 06-May-1997 RMK Added blacklist for cards whose loader doesn't work.
17 * 12-Sep-1997 RMK Created new handling of interrupt enables/disables
18 * - cards can now register their own routine to control
19 * interrupts (recommended).
20 * 29-Sep-1997 RMK Expansion card interrupt hardware not being re-enabled
21 * on reset from Linux. (Caused cards not to respond
22 * under RiscOS without hard reset).
23 * 15-Feb-1998 RMK Added DMA support
24 * 12-Sep-1998 RMK Added EASI support
25 * 10-Jan-1999 RMK Run loaders in a simulated RISC OS environment.
26 * 17-Apr-1999 RMK Support for EASI Type C cycles.
27 */
28#define ECARD_C
29
30#include <linux/config.h>
31#include <linux/module.h>
32#include <linux/kernel.h>
33#include <linux/types.h>
34#include <linux/sched.h>
35#include <linux/interrupt.h>
36#include <linux/completion.h>
37#include <linux/reboot.h>
38#include <linux/mm.h>
39#include <linux/slab.h>
40#include <linux/proc_fs.h>
41#include <linux/device.h>
42#include <linux/init.h>
43
44#include <asm/dma.h>
45#include <asm/ecard.h>
46#include <asm/hardware.h>
47#include <asm/io.h>
48#include <asm/irq.h>
49#include <asm/mmu_context.h>
50#include <asm/mach/irq.h>
51#include <asm/tlbflush.h>
52
53#ifndef CONFIG_ARCH_RPC
54#define HAVE_EXPMASK
55#endif
56
57struct ecard_request {
58 void (*fn)(struct ecard_request *);
59 ecard_t *ec;
60 unsigned int address;
61 unsigned int length;
62 unsigned int use_loader;
63 void *buffer;
64 struct completion *complete;
65};
66
67struct expcard_blacklist {
68 unsigned short manufacturer;
69 unsigned short product;
70 const char *type;
71};
72
73static ecard_t *cards;
74static ecard_t *slot_to_expcard[MAX_ECARDS];
75static unsigned int ectcr;
76#ifdef HAS_EXPMASK
77static unsigned int have_expmask;
78#endif
79
80/* List of descriptions of cards which don't have an extended
81 * identification, or chunk directories containing a description.
82 */
83static struct expcard_blacklist __initdata blacklist[] = {
84 { MANU_ACORN, PROD_ACORN_ETHER1, "Acorn Ether1" }
85};
86
87asmlinkage extern int
88ecard_loader_reset(unsigned long base, loader_t loader);
89asmlinkage extern int
90ecard_loader_read(int off, unsigned long base, loader_t loader);
91
92static inline unsigned short ecard_getu16(unsigned char *v)
93{
94 return v[0] | v[1] << 8;
95}
96
97static inline signed long ecard_gets24(unsigned char *v)
98{
99 return v[0] | v[1] << 8 | v[2] << 16 | ((v[2] & 0x80) ? 0xff000000 : 0);
100}
101
102static inline ecard_t *slot_to_ecard(unsigned int slot)
103{
104 return slot < MAX_ECARDS ? slot_to_expcard[slot] : NULL;
105}
106
107/* ===================== Expansion card daemon ======================== */
108/*
109 * Since the loader programs on the expansion cards need to be run
110 * in a specific environment, create a separate task with this
111 * environment up, and pass requests to this task as and when we
112 * need to.
113 *
114 * This should allow 99% of loaders to be called from Linux.
115 *
116 * From a security standpoint, we trust the card vendors. This
117 * may be a misplaced trust.
118 */
119static void ecard_task_reset(struct ecard_request *req)
120{
121 struct expansion_card *ec = req->ec;
122 struct resource *res;
123
124 res = ec->slot_no == 8
125 ? &ec->resource[ECARD_RES_MEMC]
126 : ec->type == ECARD_EASI
127 ? &ec->resource[ECARD_RES_EASI]
128 : &ec->resource[ECARD_RES_IOCSYNC];
129
130 ecard_loader_reset(res->start, ec->loader);
131}
132
133static void ecard_task_readbytes(struct ecard_request *req)
134{
135 struct expansion_card *ec = req->ec;
136 unsigned char *buf = req->buffer;
137 unsigned int len = req->length;
138 unsigned int off = req->address;
139
140 if (ec->slot_no == 8) {
141 void __iomem *base = (void __iomem *)
142 ec->resource[ECARD_RES_MEMC].start;
143
144 /*
145 * The card maintains an index which increments the address
146 * into a 4096-byte page on each access. We need to keep
147 * track of the counter.
148 */
149 static unsigned int index;
150 unsigned int page;
151
152 page = (off >> 12) * 4;
153 if (page > 256 * 4)
154 return;
155
156 off &= 4095;
157
158 /*
159 * If we are reading offset 0, or our current index is
160 * greater than the offset, reset the hardware index counter.
161 */
162 if (off == 0 || index > off) {
163 writeb(0, base);
164 index = 0;
165 }
166
167 /*
168 * Increment the hardware index counter until we get to the
169 * required offset. The read bytes are discarded.
170 */
171 while (index < off) {
172 readb(base + page);
173 index += 1;
174 }
175
176 while (len--) {
177 *buf++ = readb(base + page);
178 index += 1;
179 }
180 } else {
181 unsigned long base = (ec->type == ECARD_EASI
182 ? &ec->resource[ECARD_RES_EASI]
183 : &ec->resource[ECARD_RES_IOCSYNC])->start;
184 void __iomem *pbase = (void __iomem *)base;
185
186 if (!req->use_loader || !ec->loader) {
187 off *= 4;
188 while (len--) {
189 *buf++ = readb(pbase + off);
190 off += 4;
191 }
192 } else {
193 while(len--) {
194 /*
195 * The following is required by some
196 * expansion card loader programs.
197 */
198 *(unsigned long *)0x108 = 0;
199 *buf++ = ecard_loader_read(off++, base,
200 ec->loader);
201 }
202 }
203 }
204
205}
206
207static DECLARE_WAIT_QUEUE_HEAD(ecard_wait);
208static struct ecard_request *ecard_req;
209static DECLARE_MUTEX(ecard_sem);
210
211/*
212 * Set up the expansion card daemon's page tables.
213 */
214static void ecard_init_pgtables(struct mm_struct *mm)
215{
216 struct vm_area_struct vma;
217
218 /* We want to set up the page tables for the following mapping:
219 * Virtual Physical
220 * 0x03000000 0x03000000
221 * 0x03010000 unmapped
222 * 0x03210000 0x03210000
223 * 0x03400000 unmapped
224 * 0x08000000 0x08000000
225 * 0x10000000 unmapped
226 *
227 * FIXME: we don't follow this 100% yet.
228 */
229 pgd_t *src_pgd, *dst_pgd;
230
231 src_pgd = pgd_offset(mm, (unsigned long)IO_BASE);
232 dst_pgd = pgd_offset(mm, IO_START);
233
234 memcpy(dst_pgd, src_pgd, sizeof(pgd_t) * (IO_SIZE / PGDIR_SIZE));
235
236 src_pgd = pgd_offset(mm, EASI_BASE);
237 dst_pgd = pgd_offset(mm, EASI_START);
238
239 memcpy(dst_pgd, src_pgd, sizeof(pgd_t) * (EASI_SIZE / PGDIR_SIZE));
240
241 vma.vm_mm = mm;
242
243 flush_tlb_range(&vma, IO_START, IO_START + IO_SIZE);
244 flush_tlb_range(&vma, EASI_START, EASI_START + EASI_SIZE);
245}
246
247static int ecard_init_mm(void)
248{
249 struct mm_struct * mm = mm_alloc();
250 struct mm_struct *active_mm = current->active_mm;
251
252 if (!mm)
253 return -ENOMEM;
254
255 current->mm = mm;
256 current->active_mm = mm;
257 activate_mm(active_mm, mm);
258 mmdrop(active_mm);
259 ecard_init_pgtables(mm);
260 return 0;
261}
262
263static int
264ecard_task(void * unused)
265{
266 daemonize("kecardd");
267
268 /*
269 * Allocate a mm. We're not a lazy-TLB kernel task since we need
270 * to set page table entries where the user space would be. Note
271 * that this also creates the page tables. Failure is not an
272 * option here.
273 */
274 if (ecard_init_mm())
275 panic("kecardd: unable to alloc mm\n");
276
277 while (1) {
278 struct ecard_request *req;
279
280 wait_event_interruptible(ecard_wait, ecard_req != NULL);
281
282 req = xchg(&ecard_req, NULL);
283 if (req != NULL) {
284 req->fn(req);
285 complete(req->complete);
286 }
287 }
288}
289
290/*
291 * Wake the expansion card daemon to action our request.
292 *
293 * FIXME: The test here is not sufficient to detect if the
294 * kcardd is running.
295 */
296static void ecard_call(struct ecard_request *req)
297{
298 DECLARE_COMPLETION(completion);
299
300 req->complete = &completion;
301
302 down(&ecard_sem);
303 ecard_req = req;
304 wake_up(&ecard_wait);
305
306 /*
307 * Now wait for kecardd to run.
308 */
309 wait_for_completion(&completion);
310 up(&ecard_sem);
311}
312
313/* ======================= Mid-level card control ===================== */
314
315static void
316ecard_readbytes(void *addr, ecard_t *ec, int off, int len, int useld)
317{
318 struct ecard_request req;
319
320 req.fn = ecard_task_readbytes;
321 req.ec = ec;
322 req.address = off;
323 req.length = len;
324 req.use_loader = useld;
325 req.buffer = addr;
326
327 ecard_call(&req);
328}
329
330int ecard_readchunk(struct in_chunk_dir *cd, ecard_t *ec, int id, int num)
331{
332 struct ex_chunk_dir excd;
333 int index = 16;
334 int useld = 0;
335
336 if (!ec->cid.cd)
337 return 0;
338
339 while(1) {
340 ecard_readbytes(&excd, ec, index, 8, useld);
341 index += 8;
342 if (c_id(&excd) == 0) {
343 if (!useld && ec->loader) {
344 useld = 1;
345 index = 0;
346 continue;
347 }
348 return 0;
349 }
350 if (c_id(&excd) == 0xf0) { /* link */
351 index = c_start(&excd);
352 continue;
353 }
354 if (c_id(&excd) == 0x80) { /* loader */
355 if (!ec->loader) {
356 ec->loader = (loader_t)kmalloc(c_len(&excd),
357 GFP_KERNEL);
358 if (ec->loader)
359 ecard_readbytes(ec->loader, ec,
360 (int)c_start(&excd),
361 c_len(&excd), useld);
362 else
363 return 0;
364 }
365 continue;
366 }
367 if (c_id(&excd) == id && num-- == 0)
368 break;
369 }
370
371 if (c_id(&excd) & 0x80) {
372 switch (c_id(&excd) & 0x70) {
373 case 0x70:
374 ecard_readbytes((unsigned char *)excd.d.string, ec,
375 (int)c_start(&excd), c_len(&excd),
376 useld);
377 break;
378 case 0x00:
379 break;
380 }
381 }
382 cd->start_offset = c_start(&excd);
383 memcpy(cd->d.string, excd.d.string, 256);
384 return 1;
385}
386
387/* ======================= Interrupt control ============================ */
388
389static void ecard_def_irq_enable(ecard_t *ec, int irqnr)
390{
391#ifdef HAS_EXPMASK
392 if (irqnr < 4 && have_expmask) {
393 have_expmask |= 1 << irqnr;
394 __raw_writeb(have_expmask, EXPMASK_ENABLE);
395 }
396#endif
397}
398
399static void ecard_def_irq_disable(ecard_t *ec, int irqnr)
400{
401#ifdef HAS_EXPMASK
402 if (irqnr < 4 && have_expmask) {
403 have_expmask &= ~(1 << irqnr);
404 __raw_writeb(have_expmask, EXPMASK_ENABLE);
405 }
406#endif
407}
408
409static int ecard_def_irq_pending(ecard_t *ec)
410{
411 return !ec->irqmask || readb(ec->irqaddr) & ec->irqmask;
412}
413
414static void ecard_def_fiq_enable(ecard_t *ec, int fiqnr)
415{
416 panic("ecard_def_fiq_enable called - impossible");
417}
418
419static void ecard_def_fiq_disable(ecard_t *ec, int fiqnr)
420{
421 panic("ecard_def_fiq_disable called - impossible");
422}
423
424static int ecard_def_fiq_pending(ecard_t *ec)
425{
426 return !ec->fiqmask || readb(ec->fiqaddr) & ec->fiqmask;
427}
428
429static expansioncard_ops_t ecard_default_ops = {
430 ecard_def_irq_enable,
431 ecard_def_irq_disable,
432 ecard_def_irq_pending,
433 ecard_def_fiq_enable,
434 ecard_def_fiq_disable,
435 ecard_def_fiq_pending
436};
437
438/*
439 * Enable and disable interrupts from expansion cards.
440 * (interrupts are disabled for these functions).
441 *
442 * They are not meant to be called directly, but via enable/disable_irq.
443 */
444static void ecard_irq_unmask(unsigned int irqnr)
445{
446 ecard_t *ec = slot_to_ecard(irqnr - 32);
447
448 if (ec) {
449 if (!ec->ops)
450 ec->ops = &ecard_default_ops;
451
452 if (ec->claimed && ec->ops->irqenable)
453 ec->ops->irqenable(ec, irqnr);
454 else
455 printk(KERN_ERR "ecard: rejecting request to "
456 "enable IRQs for %d\n", irqnr);
457 }
458}
459
460static void ecard_irq_mask(unsigned int irqnr)
461{
462 ecard_t *ec = slot_to_ecard(irqnr - 32);
463
464 if (ec) {
465 if (!ec->ops)
466 ec->ops = &ecard_default_ops;
467
468 if (ec->ops && ec->ops->irqdisable)
469 ec->ops->irqdisable(ec, irqnr);
470 }
471}
472
473static struct irqchip ecard_chip = {
474 .ack = ecard_irq_mask,
475 .mask = ecard_irq_mask,
476 .unmask = ecard_irq_unmask,
477};
478
479void 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
495void 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
508static 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
531static void ecard_check_lockup(struct irqdesc *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
568static void
569ecard_irq_handler(unsigned int irq, struct irqdesc *desc, struct pt_regs *regs)
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 irqdesc *d = irq_desc + ec->irq;
588 d->handle(ec->irq, d, regs);
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
599static unsigned char priority_masks[] =
600{
601 0xf0, 0xf1, 0xf3, 0xf7, 0xff, 0xff, 0xff, 0xff
602};
603
604static 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
610static void
611ecard_irqexp_handler(unsigned int irq, struct irqdesc *desc, struct pt_regs *regs)
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 irqdesc *d = irqdesc + 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 d->handle(ec->irq, d, regs);
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
646static 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
680unsigned 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
724static 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
752static 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
775static struct proc_dir_entry *proc_bus_ecard_dir = NULL;
776
777static 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
792static 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
803static 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 = kmalloc(sizeof(ecard_t), GFP_KERNEL);
810 if (!ec) {
811 ec = ERR_PTR(-ENOMEM);
812 goto nomem;
813 }
814
815 memset(ec, 0, sizeof(ecard_t));
816
817 ec->slot_no = slot;
818 ec->type = type;
819 ec->irq = NO_IRQ;
820 ec->fiq = NO_IRQ;
821 ec->dma = NO_DMA;
822 ec->ops = &ecard_default_ops;
823
824 snprintf(ec->dev.bus_id, sizeof(ec->dev.bus_id), "ecard%d", slot);
825 ec->dev.parent = NULL;
826 ec->dev.bus = &ecard_bus_type;
827 ec->dev.dma_mask = &ec->dma_mask;
828 ec->dma_mask = (u64)0xffffffff;
829
830 if (slot < 4) {
831 ec_set_resource(ec, ECARD_RES_MEMC,
832 PODSLOT_MEMC_BASE + (slot << 14),
833 PODSLOT_MEMC_SIZE);
834 base = PODSLOT_IOC0_BASE + (slot << 14);
835 } else
836 base = PODSLOT_IOC4_BASE + ((slot - 4) << 14);
837
838#ifdef CONFIG_ARCH_RPC
839 if (slot < 8) {
840 ec_set_resource(ec, ECARD_RES_EASI,
841 PODSLOT_EASI_BASE + (slot << 24),
842 PODSLOT_EASI_SIZE);
843 }
844
845 if (slot == 8) {
846 ec_set_resource(ec, ECARD_RES_MEMC, NETSLOT_BASE, NETSLOT_SIZE);
847 } else
848#endif
849
850 for (i = 0; i <= ECARD_RES_IOCSYNC - ECARD_RES_IOCSLOW; i++)
851 ec_set_resource(ec, i + ECARD_RES_IOCSLOW,
852 base + (i << 19), PODSLOT_IOC_SIZE);
853
854 for (i = 0; i < ECARD_NUM_RESOURCES; i++) {
855 if (ec->resource[i].flags &&
856 request_resource(&iomem_resource, &ec->resource[i])) {
857 printk(KERN_ERR "%s: resource(s) not available\n",
858 ec->dev.bus_id);
859 ec->resource[i].end -= ec->resource[i].start;
860 ec->resource[i].start = 0;
861 ec->resource[i].flags = 0;
862 }
863 }
864
865 nomem:
866 return ec;
867}
868
869static ssize_t ecard_show_irq(struct device *dev, char *buf)
870{
871 struct expansion_card *ec = ECARD_DEV(dev);
872 return sprintf(buf, "%u\n", ec->irq);
873}
874
875static ssize_t ecard_show_dma(struct device *dev, char *buf)
876{
877 struct expansion_card *ec = ECARD_DEV(dev);
878 return sprintf(buf, "%u\n", ec->dma);
879}
880
881static ssize_t ecard_show_resources(struct device *dev, char *buf)
882{
883 struct expansion_card *ec = ECARD_DEV(dev);
884 char *str = buf;
885 int i;
886
887 for (i = 0; i < ECARD_NUM_RESOURCES; i++)
888 str += sprintf(str, "%08lx %08lx %08lx\n",
889 ec->resource[i].start,
890 ec->resource[i].end,
891 ec->resource[i].flags);
892
893 return str - buf;
894}
895
896static ssize_t ecard_show_vendor(struct device *dev, char *buf)
897{
898 struct expansion_card *ec = ECARD_DEV(dev);
899 return sprintf(buf, "%u\n", ec->cid.manufacturer);
900}
901
902static ssize_t ecard_show_device(struct device *dev, char *buf)
903{
904 struct expansion_card *ec = ECARD_DEV(dev);
905 return sprintf(buf, "%u\n", ec->cid.product);
906}
907
908static ssize_t ecard_show_type(struct device *dev, char *buf)
909{
910 struct expansion_card *ec = ECARD_DEV(dev);
911 return sprintf(buf, "%s\n", ec->type == ECARD_EASI ? "EASI" : "IOC");
912}
913
914static struct device_attribute ecard_dev_attrs[] = {
915 __ATTR(device, S_IRUGO, ecard_show_device, NULL),
916 __ATTR(dma, S_IRUGO, ecard_show_dma, NULL),
917 __ATTR(irq, S_IRUGO, ecard_show_irq, NULL),
918 __ATTR(resource, S_IRUGO, ecard_show_resources, NULL),
919 __ATTR(type, S_IRUGO, ecard_show_type, NULL),
920 __ATTR(vendor, S_IRUGO, ecard_show_vendor, NULL),
921 __ATTR_NULL,
922};
923
924
925int ecard_request_resources(struct expansion_card *ec)
926{
927 int i, err = 0;
928
929 for (i = 0; i < ECARD_NUM_RESOURCES; i++) {
930 if (ecard_resource_end(ec, i) &&
931 !request_mem_region(ecard_resource_start(ec, i),
932 ecard_resource_len(ec, i),
933 ec->dev.driver->name)) {
934 err = -EBUSY;
935 break;
936 }
937 }
938
939 if (err) {
940 while (i--)
941 if (ecard_resource_end(ec, i))
942 release_mem_region(ecard_resource_start(ec, i),
943 ecard_resource_len(ec, i));
944 }
945 return err;
946}
947EXPORT_SYMBOL(ecard_request_resources);
948
949void ecard_release_resources(struct expansion_card *ec)
950{
951 int i;
952
953 for (i = 0; i < ECARD_NUM_RESOURCES; i++)
954 if (ecard_resource_end(ec, i))
955 release_mem_region(ecard_resource_start(ec, i),
956 ecard_resource_len(ec, i));
957}
958EXPORT_SYMBOL(ecard_release_resources);
959
960/*
961 * Probe for an expansion card.
962 *
963 * If bit 1 of the first byte of the card is set, then the
964 * card does not exist.
965 */
966static int __init
967ecard_probe(int slot, card_type_t type)
968{
969 ecard_t **ecp;
970 ecard_t *ec;
971 struct ex_ecid cid;
972 int i, rc;
973
974 ec = ecard_alloc_card(type, slot);
975 if (IS_ERR(ec)) {
976 rc = PTR_ERR(ec);
977 goto nomem;
978 }
979
980 rc = -ENODEV;
981 if ((ec->podaddr = ecard_address(ec, type, ECARD_SYNC)) == 0)
982 goto nodev;
983
984 cid.r_zero = 1;
985 ecard_readbytes(&cid, ec, 0, 16, 0);
986 if (cid.r_zero)
987 goto nodev;
988
989 ec->cid.id = cid.r_id;
990 ec->cid.cd = cid.r_cd;
991 ec->cid.is = cid.r_is;
992 ec->cid.w = cid.r_w;
993 ec->cid.manufacturer = ecard_getu16(cid.r_manu);
994 ec->cid.product = ecard_getu16(cid.r_prod);
995 ec->cid.country = cid.r_country;
996 ec->cid.irqmask = cid.r_irqmask;
997 ec->cid.irqoff = ecard_gets24(cid.r_irqoff);
998 ec->cid.fiqmask = cid.r_fiqmask;
999 ec->cid.fiqoff = ecard_gets24(cid.r_fiqoff);
1000 ec->fiqaddr =
1001 ec->irqaddr = (void __iomem *)ioaddr(ec->podaddr);
1002
1003 if (ec->cid.is) {
1004 ec->irqmask = ec->cid.irqmask;
1005 ec->irqaddr += ec->cid.irqoff;
1006 ec->fiqmask = ec->cid.fiqmask;
1007 ec->fiqaddr += ec->cid.fiqoff;
1008 } else {
1009 ec->irqmask = 1;
1010 ec->fiqmask = 4;
1011 }
1012
1013 for (i = 0; i < sizeof(blacklist) / sizeof(*blacklist); i++)
1014 if (blacklist[i].manufacturer == ec->cid.manufacturer &&
1015 blacklist[i].product == ec->cid.product) {
1016 ec->card_desc = blacklist[i].type;
1017 break;
1018 }
1019
1020 /*
1021 * hook the interrupt handlers
1022 */
1023 if (slot < 8) {
1024 ec->irq = 32 + slot;
1025 set_irq_chip(ec->irq, &ecard_chip);
1026 set_irq_handler(ec->irq, do_level_IRQ);
1027 set_irq_flags(ec->irq, IRQF_VALID);
1028 }
1029
1030#ifdef IO_EC_MEMC8_BASE
1031 if (slot == 8)
1032 ec->irq = 11;
1033#endif
1034#ifdef CONFIG_ARCH_RPC
1035 /* On RiscPC, only first two slots have DMA capability */
1036 if (slot < 2)
1037 ec->dma = 2 + slot;
1038#endif
1039
1040 for (ecp = &cards; *ecp; ecp = &(*ecp)->next);
1041
1042 *ecp = ec;
1043 slot_to_expcard[slot] = ec;
1044
1045 device_register(&ec->dev);
1046
1047 return 0;
1048
1049 nodev:
1050 ecard_free_card(ec);
1051 nomem:
1052 return rc;
1053}
1054
1055/*
1056 * Initialise the expansion card system.
1057 * Locate all hardware - interrupt management and
1058 * actual cards.
1059 */
1060static int __init ecard_init(void)
1061{
1062 int slot, irqhw, ret;
1063
1064 ret = kernel_thread(ecard_task, NULL, CLONE_KERNEL);
1065 if (ret < 0) {
1066 printk(KERN_ERR "Ecard: unable to create kernel thread: %d\n",
1067 ret);
1068 return ret;
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
1092subsys_initcall(ecard_init);
1093
1094/*
1095 * ECARD "bus"
1096 */
1097static const struct ecard_id *
1098ecard_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
1110static 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
1126static 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 */
1143static 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 (drv->shutdown)
1150 drv->shutdown(ec);
1151 ecard_release(ec);
1152
1153 /*
1154 * If this card has a loader, call the reset handler.
1155 */
1156 if (ec->loader) {
1157 req.fn = ecard_task_reset;
1158 req.ec = ec;
1159 ecard_call(&req);
1160 }
1161}
1162
1163int ecard_register_driver(struct ecard_driver *drv)
1164{
1165 drv->drv.bus = &ecard_bus_type;
1166 drv->drv.probe = ecard_drv_probe;
1167 drv->drv.remove = ecard_drv_remove;
1168 drv->drv.shutdown = ecard_drv_shutdown;
1169
1170 return driver_register(&drv->drv);
1171}
1172
1173void ecard_remove_driver(struct ecard_driver *drv)
1174{
1175 driver_unregister(&drv->drv);
1176}
1177
1178static int ecard_match(struct device *_dev, struct device_driver *_drv)
1179{
1180 struct expansion_card *ec = ECARD_DEV(_dev);
1181 struct ecard_driver *drv = ECARD_DRV(_drv);
1182 int ret;
1183
1184 if (drv->id_table) {
1185 ret = ecard_match_device(drv->id_table, ec) != NULL;
1186 } else {
1187 ret = ec->cid.id == drv->id;
1188 }
1189
1190 return ret;
1191}
1192
1193struct bus_type ecard_bus_type = {
1194 .name = "ecard",
1195 .dev_attrs = ecard_dev_attrs,
1196 .match = ecard_match,
1197};
1198
1199static int ecard_bus_init(void)
1200{
1201 return bus_register(&ecard_bus_type);
1202}
1203
1204postcore_initcall(ecard_bus_init);
1205
1206EXPORT_SYMBOL(ecard_readchunk);
1207EXPORT_SYMBOL(__ecard_address);
1208EXPORT_SYMBOL(ecard_register_driver);
1209EXPORT_SYMBOL(ecard_remove_driver);
1210EXPORT_SYMBOL(ecard_bus_type);
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-17 19:41:11 -0500