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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/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/seq_file.h>
41#include <linux/device.h>
42#include <linux/init.h>
43#include <linux/mutex.h>
44#include <linux/kthread.h>
45#include <linux/io.h>
46
47#include <asm/dma.h>
48#include <asm/ecard.h>
49#include <mach/hardware.h>
50#include <asm/irq.h>
51#include <asm/mmu_context.h>
52#include <asm/mach/irq.h>
53#include <asm/tlbflush.h>
54
55#include "ecard.h"
56
57#ifndef CONFIG_ARCH_RPC
58#define HAVE_EXPMASK
59#endif
60
61struct ecard_request {
62 void (*fn)(struct ecard_request *);
63 ecard_t *ec;
64 unsigned int address;
65 unsigned int length;
66 unsigned int use_loader;
67 void *buffer;
68 struct completion *complete;
69};
70
71struct expcard_blacklist {
72 unsigned short manufacturer;
73 unsigned short product;
74 const char *type;
75};
76
77static ecard_t *cards;
78static ecard_t *slot_to_expcard[MAX_ECARDS];
79static unsigned int ectcr;
80#ifdef HAS_EXPMASK
81static unsigned int have_expmask;
82#endif
83
84/* List of descriptions of cards which don't have an extended
85 * identification, or chunk directories containing a description.
86 */
87static struct expcard_blacklist __initdata blacklist[] = {
88 { MANU_ACORN, PROD_ACORN_ETHER1, "Acorn Ether1" }
89};
90
91asmlinkage extern int
92ecard_loader_reset(unsigned long base, loader_t loader);
93asmlinkage extern int
94ecard_loader_read(int off, unsigned long base, loader_t loader);
95
96static inline unsigned short ecard_getu16(unsigned char *v)
97{
98 return v[0] | v[1] << 8;
99}
100
101static inline signed long ecard_gets24(unsigned char *v)
102{
103 return v[0] | v[1] << 8 | v[2] << 16 | ((v[2] & 0x80) ? 0xff000000 : 0);
104}
105
106static inline ecard_t *slot_to_ecard(unsigned int slot)
107{
108 return slot < MAX_ECARDS ? slot_to_expcard[slot] : NULL;
109}
110
111/* ===================== Expansion card daemon ======================== */
112/*
113 * Since the loader programs on the expansion cards need to be run
114 * in a specific environment, create a separate task with this
115 * environment up, and pass requests to this task as and when we
116 * need to.
117 *
118 * This should allow 99% of loaders to be called from Linux.
119 *
120 * From a security standpoint, we trust the card vendors. This
121 * may be a misplaced trust.
122 */
123static void ecard_task_reset(struct ecard_request *req)
124{
125 struct expansion_card *ec = req->ec;
126 struct resource *res;
127
128 res = ec->slot_no == 8
129 ? &ec->resource[ECARD_RES_MEMC]
130 : ec->easi
131 ? &ec->resource[ECARD_RES_EASI]
132 : &ec->resource[ECARD_RES_IOCSYNC];
133
134 ecard_loader_reset(res->start, ec->loader);
135}
136
137static void ecard_task_readbytes(struct ecard_request *req)
138{
139 struct expansion_card *ec = req->ec;
140 unsigned char *buf = req->buffer;
141 unsigned int len = req->length;
142 unsigned int off = req->address;
143
144 if (ec->slot_no == 8) {
145 void __iomem *base = (void __iomem *)
146 ec->resource[ECARD_RES_MEMC].start;
147
148 /*
149 * The card maintains an index which increments the address
150 * into a 4096-byte page on each access. We need to keep
151 * track of the counter.
152 */
153 static unsigned int index;
154 unsigned int page;
155
156 page = (off >> 12) * 4;
157 if (page > 256 * 4)
158 return;
159
160 off &= 4095;
161
162 /*
163 * If we are reading offset 0, or our current index is
164 * greater than the offset, reset the hardware index counter.
165 */
166 if (off == 0 || index > off) {
167 writeb(0, base);
168 index = 0;
169 }
170
171 /*
172 * Increment the hardware index counter until we get to the
173 * required offset. The read bytes are discarded.
174 */
175 while (index < off) {
176 readb(base + page);
177 index += 1;
178 }
179
180 while (len--) {
181 *buf++ = readb(base + page);
182 index += 1;
183 }
184 } else {
185 unsigned long base = (ec->easi
186 ? &ec->resource[ECARD_RES_EASI]
187 : &ec->resource[ECARD_RES_IOCSYNC])->start;
188 void __iomem *pbase = (void __iomem *)base;
189
190 if (!req->use_loader || !ec->loader) {
191 off *= 4;
192 while (len--) {
193 *buf++ = readb(pbase + off);
194 off += 4;
195 }
196 } else {
197 while(len--) {
198 /*
199 * The following is required by some
200 * expansion card loader programs.
201 */
202 *(unsigned long *)0x108 = 0;
203 *buf++ = ecard_loader_read(off++, base,
204 ec->loader);
205 }
206 }
207 }
208
209}
210
211static DECLARE_WAIT_QUEUE_HEAD(ecard_wait);
212static struct ecard_request *ecard_req;
213static DEFINE_MUTEX(ecard_mutex);
214
215/*
216 * Set up the expansion card daemon's page tables.
217 */
218static void ecard_init_pgtables(struct mm_struct *mm)
219{
220 struct vm_area_struct vma;
221
222 /* We want to set up the page tables for the following mapping:
223 * Virtual Physical
224 * 0x03000000 0x03000000
225 * 0x03010000 unmapped
226 * 0x03210000 0x03210000
227 * 0x03400000 unmapped
228 * 0x08000000 0x08000000
229 * 0x10000000 unmapped
230 *
231 * FIXME: we don't follow this 100% yet.
232 */
233 pgd_t *src_pgd, *dst_pgd;
234
235 src_pgd = pgd_offset(mm, (unsigned long)IO_BASE);
236 dst_pgd = pgd_offset(mm, IO_START);
237
238 memcpy(dst_pgd, src_pgd, sizeof(pgd_t) * (IO_SIZE / PGDIR_SIZE));
239
240 src_pgd = pgd_offset(mm, EASI_BASE);
241 dst_pgd = pgd_offset(mm, EASI_START);
242
243 memcpy(dst_pgd, src_pgd, sizeof(pgd_t) * (EASI_SIZE / PGDIR_SIZE));
244
245 vma.vm_mm = mm;
246
247 flush_tlb_range(&vma, IO_START, IO_START + IO_SIZE);
248 flush_tlb_range(&vma, EASI_START, EASI_START + EASI_SIZE);
249}
250
251static int ecard_init_mm(void)
252{
253 struct mm_struct * mm = mm_alloc();
254 struct mm_struct *active_mm = current->active_mm;
255
256 if (!mm)
257 return -ENOMEM;
258
259 current->mm = mm;
260 current->active_mm = mm;
261 activate_mm(active_mm, mm);
262 mmdrop(active_mm);
263 ecard_init_pgtables(mm);
264 return 0;
265}
266
267static int
268ecard_task(void * unused)
269{
270 /*
271 * Allocate a mm. We're not a lazy-TLB kernel task since we need
272 * to set page table entries where the user space would be. Note
273 * that this also creates the page tables. Failure is not an
274 * option here.
275 */
276 if (ecard_init_mm())
277 panic("kecardd: unable to alloc mm\n");
278
279 while (1) {
280 struct ecard_request *req;
281
282 wait_event_interruptible(ecard_wait, ecard_req != NULL);
283
284 req = xchg(&ecard_req, NULL);
285 if (req != NULL) {
286 req->fn(req);
287 complete(req->complete);
288 }
289 }
290}
291
292/*
293 * Wake the expansion card daemon to action our request.
294 *
295 * FIXME: The test here is not sufficient to detect if the
296 * kcardd is running.
297 */
298static void ecard_call(struct ecard_request *req)
299{
300 DECLARE_COMPLETION_ONSTACK(completion);
301
302 req->complete = &completion;
303
304 mutex_lock(&ecard_mutex);
305 ecard_req = req;
306 wake_up(&ecard_wait);
307
308 /*
309 * Now wait for kecardd to run.
310 */
311 wait_for_completion(&completion);
312 mutex_unlock(&ecard_mutex);
313}
314
315/* ======================= Mid-level card control ===================== */
316
317static void
318ecard_readbytes(void *addr, ecard_t *ec, int off, int len, int useld)
319{
320 struct ecard_request req;
321
322 req.fn = ecard_task_readbytes;
323 req.ec = ec;
324 req.address = off;
325 req.length = len;
326 req.use_loader = useld;
327 req.buffer = addr;
328
329 ecard_call(&req);
330}
331
332int ecard_readchunk(struct in_chunk_dir *cd, ecard_t *ec, int id, int num)
333{
334 struct ex_chunk_dir excd;
335 int index = 16;
336 int useld = 0;
337
338 if (!ec->cid.cd)
339 return 0;
340
341 while(1) {
342 ecard_readbytes(&excd, ec, index, 8, useld);
343 index += 8;
344 if (c_id(&excd) == 0) {
345 if (!useld && ec->loader) {
346 useld = 1;
347 index = 0;
348 continue;
349 }
350 return 0;
351 }
352 if (c_id(&excd) == 0xf0) { /* link */
353 index = c_start(&excd);
354 continue;
355 }
356 if (c_id(&excd) == 0x80) { /* loader */
357 if (!ec->loader) {
358 ec->loader = kmalloc(c_len(&excd),
359 GFP_KERNEL);
360 if (ec->loader)
361 ecard_readbytes(ec->loader, ec,
362 (int)c_start(&excd),
363 c_len(&excd), useld);
364 else
365 return 0;
366 }
367 continue;
368 }
369 if (c_id(&excd) == id && num-- == 0)
370 break;
371 }
372
373 if (c_id(&excd) & 0x80) {
374 switch (c_id(&excd) & 0x70) {
375 case 0x70:
376 ecard_readbytes((unsigned char *)excd.d.string, ec,
377 (int)c_start(&excd), c_len(&excd),
378 useld);
379 break;
380 case 0x00:
381 break;
382 }
383 }
384 cd->start_offset = c_start(&excd);
385 memcpy(cd->d.string, excd.d.string, 256);
386 return 1;
387}
388
389/* ======================= Interrupt control ============================ */
390
391static void ecard_def_irq_enable(ecard_t *ec, int irqnr)
392{
393#ifdef HAS_EXPMASK
394 if (irqnr < 4 && have_expmask) {
395 have_expmask |= 1 << irqnr;
396 __raw_writeb(have_expmask, EXPMASK_ENABLE);
397 }
398#endif
399}
400
401static void ecard_def_irq_disable(ecard_t *ec, int irqnr)
402{
403#ifdef HAS_EXPMASK
404 if (irqnr < 4 && have_expmask) {
405 have_expmask &= ~(1 << irqnr);
406 __raw_writeb(have_expmask, EXPMASK_ENABLE);
407 }
408#endif
409}
410
411static int ecard_def_irq_pending(ecard_t *ec)
412{
413 return !ec->irqmask || readb(ec->irqaddr) & ec->irqmask;
414}
415
416static void ecard_def_fiq_enable(ecard_t *ec, int fiqnr)
417{
418 panic("ecard_def_fiq_enable called - impossible");
419}
420
421static void ecard_def_fiq_disable(ecard_t *ec, int fiqnr)
422{
423 panic("ecard_def_fiq_disable called - impossible");
424}
425
426static int ecard_def_fiq_pending(ecard_t *ec)
427{
428 return !ec->fiqmask || readb(ec->fiqaddr) & ec->fiqmask;
429}
430
431static expansioncard_ops_t ecard_default_ops = {
432 ecard_def_irq_enable,
433 ecard_def_irq_disable,
434 ecard_def_irq_pending,
435 ecard_def_fiq_enable,
436 ecard_def_fiq_disable,
437 ecard_def_fiq_pending
438};
439
440/*
441 * Enable and disable interrupts from expansion cards.
442 * (interrupts are disabled for these functions).
443 *
444 * They are not meant to be called directly, but via enable/disable_irq.
445 */
446static void ecard_irq_unmask(struct irq_data *d)
447{
448 ecard_t *ec = slot_to_ecard(d->irq - 32);
449
450 if (ec) {
451 if (!ec->ops)
452 ec->ops = &ecard_default_ops;
453
454 if (ec->claimed && ec->ops->irqenable)
455 ec->ops->irqenable(ec, d->irq);
456 else
457 printk(KERN_ERR "ecard: rejecting request to "
458 "enable IRQs for %d\n", d->irq);
459 }
460}
461
462static void ecard_irq_mask(struct irq_data *d)
463{
464 ecard_t *ec = slot_to_ecard(d->irq - 32);
465
466 if (ec) {
467 if (!ec->ops)
468 ec->ops = &ecard_default_ops;
469
470 if (ec->ops && ec->ops->irqdisable)
471 ec->ops->irqdisable(ec, d->irq);
472 }
473}
474
475static struct irq_chip ecard_chip = {
476 .name = "ECARD",
477 .irq_ack = ecard_irq_mask,
478 .irq_mask = ecard_irq_mask,
479 .irq_unmask = ecard_irq_unmask,
480};
481
482void ecard_enablefiq(unsigned int fiqnr)
483{
484 ecard_t *ec = slot_to_ecard(fiqnr);
485
486 if (ec) {
487 if (!ec->ops)
488 ec->ops = &ecard_default_ops;
489
490 if (ec->claimed && ec->ops->fiqenable)
491 ec->ops->fiqenable(ec, fiqnr);
492 else
493 printk(KERN_ERR "ecard: rejecting request to "
494 "enable FIQs for %d\n", fiqnr);
495 }
496}
497
498void ecard_disablefiq(unsigned int fiqnr)
499{
500 ecard_t *ec = slot_to_ecard(fiqnr);
501
502 if (ec) {
503 if (!ec->ops)
504 ec->ops = &ecard_default_ops;
505
506 if (ec->ops->fiqdisable)
507 ec->ops->fiqdisable(ec, fiqnr);
508 }
509}
510
511static void ecard_dump_irq_state(void)
512{
513 ecard_t *ec;
514
515 printk("Expansion card IRQ state:\n");
516
517 for (ec = cards; ec; ec = ec->next) {
518 if (ec->slot_no == 8)
519 continue;
520
521 printk(" %d: %sclaimed, ",
522 ec->slot_no, ec->claimed ? "" : "not ");
523
524 if (ec->ops && ec->ops->irqpending &&
525 ec->ops != &ecard_default_ops)
526 printk("irq %spending\n",
527 ec->ops->irqpending(ec) ? "" : "not ");
528 else
529 printk("irqaddr %p, mask = %02X, status = %02X\n",
530 ec->irqaddr, ec->irqmask, readb(ec->irqaddr));
531 }
532}
533
534static void ecard_check_lockup(struct irq_desc *desc)
535{
536 static unsigned long last;
537 static int lockup;
538
539 /*
540 * If the timer interrupt has not run since the last million
541 * unrecognised expansion card interrupts, then there is
542 * something seriously wrong. Disable the expansion card
543 * interrupts so at least we can continue.
544 *
545 * Maybe we ought to start a timer to re-enable them some time
546 * later?
547 */
548 if (last == jiffies) {
549 lockup += 1;
550 if (lockup > 1000000) {
551 printk(KERN_ERR "\nInterrupt lockup detected - "
552 "disabling all expansion card interrupts\n");
553
554 desc->irq_data.chip->irq_mask(&desc->irq_data);
555 ecard_dump_irq_state();
556 }
557 } else
558 lockup = 0;
559
560 /*
561 * If we did not recognise the source of this interrupt,
562 * warn the user, but don't flood the user with these messages.
563 */
564 if (!last || time_after(jiffies, last + 5*HZ)) {
565 last = jiffies;
566 printk(KERN_WARNING "Unrecognised interrupt from backplane\n");
567 ecard_dump_irq_state();
568 }
569}
570
571static void
572ecard_irq_handler(unsigned int irq, struct irq_desc *desc)
573{
574 ecard_t *ec;
575 int called = 0;
576
577 desc->irq_data.chip->irq_mask(&desc->irq_data);
578 for (ec = cards; ec; ec = ec->next) {
579 int pending;
580
581 if (!ec->claimed || ec->irq == NO_IRQ || ec->slot_no == 8)
582 continue;
583
584 if (ec->ops && ec->ops->irqpending)
585 pending = ec->ops->irqpending(ec);
586 else
587 pending = ecard_default_ops.irqpending(ec);
588
589 if (pending) {
590 generic_handle_irq(ec->irq);
591 called ++;
592 }
593 }
594 desc->irq_data.chip->irq_unmask(&desc->irq_data);
595
596 if (called == 0)
597 ecard_check_lockup(desc);
598}
599
600#ifdef HAS_EXPMASK
601static unsigned char priority_masks[] =
602{
603 0xf0, 0xf1, 0xf3, 0xf7, 0xff, 0xff, 0xff, 0xff
604};
605
606static unsigned char first_set[] =
607{
608 0x00, 0x00, 0x01, 0x00, 0x02, 0x00, 0x01, 0x00,
609 0x03, 0x00, 0x01, 0x00, 0x02, 0x00, 0x01, 0x00
610};
611
612static void
613ecard_irqexp_handler(unsigned int irq, struct irq_desc *desc)
614{
615 const unsigned int statusmask = 15;
616 unsigned int status;
617
618 status = __raw_readb(EXPMASK_STATUS) & statusmask;
619 if (status) {
620 unsigned int slot = first_set[status];
621 ecard_t *ec = slot_to_ecard(slot);
622
623 if (ec->claimed) {
624 /*
625 * this ugly code is so that we can operate a
626 * prioritorising system:
627 *
628 * Card 0 highest priority
629 * Card 1
630 * Card 2
631 * Card 3 lowest priority
632 *
633 * Serial cards should go in 0/1, ethernet/scsi in 2/3
634 * otherwise you will lose serial data at high speeds!
635 */
636 generic_handle_irq(ec->irq);
637 } else {
638 printk(KERN_WARNING "card%d: interrupt from unclaimed "
639 "card???\n", slot);
640 have_expmask &= ~(1 << slot);
641 __raw_writeb(have_expmask, EXPMASK_ENABLE);
642 }
643 } else
644 printk(KERN_WARNING "Wild interrupt from backplane (masks)\n");
645}
646
647static int __init ecard_probeirqhw(void)
648{
649 ecard_t *ec;
650 int found;
651
652 __raw_writeb(0x00, EXPMASK_ENABLE);
653 __raw_writeb(0xff, EXPMASK_STATUS);
654 found = (__raw_readb(EXPMASK_STATUS) & 15) == 0;
655 __raw_writeb(0xff, EXPMASK_ENABLE);
656
657 if (found) {
658 printk(KERN_DEBUG "Expansion card interrupt "
659 "management hardware found\n");
660
661 /* for each card present, set a bit to '1' */
662 have_expmask = 0x80000000;
663
664 for (ec = cards; ec; ec = ec->next)
665 have_expmask |= 1 << ec->slot_no;
666
667 __raw_writeb(have_expmask, EXPMASK_ENABLE);
668 }
669
670 return found;
671}
672#else
673#define ecard_irqexp_handler NULL
674#define ecard_probeirqhw() (0)
675#endif
676
677#ifndef IO_EC_MEMC8_BASE
678#define IO_EC_MEMC8_BASE 0
679#endif
680
681static unsigned int __ecard_address(ecard_t *ec, card_type_t type, card_speed_t speed)
682{
683 unsigned long address = 0;
684 int slot = ec->slot_no;
685
686 if (ec->slot_no == 8)
687 return IO_EC_MEMC8_BASE;
688
689 ectcr &= ~(1 << slot);
690
691 switch (type) {
692 case ECARD_MEMC:
693 if (slot < 4)
694 address = IO_EC_MEMC_BASE + (slot << 12);
695 break;
696
697 case ECARD_IOC:
698 if (slot < 4)
699 address = IO_EC_IOC_BASE + (slot << 12);
700#ifdef IO_EC_IOC4_BASE
701 else
702 address = IO_EC_IOC4_BASE + ((slot - 4) << 12);
703#endif
704 if (address)
705 address += speed << 17;
706 break;
707
708#ifdef IO_EC_EASI_BASE
709 case ECARD_EASI:
710 address = IO_EC_EASI_BASE + (slot << 22);
711 if (speed == ECARD_FAST)
712 ectcr |= 1 << slot;
713 break;
714#endif
715 default:
716 break;
717 }
718
719#ifdef IOMD_ECTCR
720 iomd_writeb(ectcr, IOMD_ECTCR);
721#endif
722 return address;
723}
724
725static int ecard_prints(struct seq_file *m, ecard_t *ec)
726{
727 seq_printf(m, " %d: %s ", ec->slot_no, ec->easi ? "EASI" : " ");
728
729 if (ec->cid.id == 0) {
730 struct in_chunk_dir incd;
731
732 seq_printf(m, "[%04X:%04X] ",
733 ec->cid.manufacturer, ec->cid.product);
734
735 if (!ec->card_desc && ec->cid.cd &&
736 ecard_readchunk(&incd, ec, 0xf5, 0)) {
737 ec->card_desc = kmalloc(strlen(incd.d.string)+1, GFP_KERNEL);
738
739 if (ec->card_desc)
740 strcpy((char *)ec->card_desc, incd.d.string);
741 }
742
743 seq_printf(m, "%s\n", ec->card_desc ? ec->card_desc : "*unknown*");
744 } else
745 seq_printf(m, "Simple card %d\n", ec->cid.id);
746
747 return 0;
748}
749
750static int ecard_devices_proc_show(struct seq_file *m, void *v)
751{
752 ecard_t *ec = cards;
753
754 while (ec) {
755 ecard_prints(m, ec);
756 ec = ec->next;
757 }
758 return 0;
759}
760
761static int ecard_devices_proc_open(struct inode *inode, struct file *file)
762{
763 return single_open(file, ecard_devices_proc_show, NULL);
764}
765
766static const struct file_operations bus_ecard_proc_fops = {
767 .owner = THIS_MODULE,
768 .open = ecard_devices_proc_open,
769 .read = seq_read,
770 .llseek = seq_lseek,
771 .release = single_release,
772};
773
774static struct proc_dir_entry *proc_bus_ecard_dir = NULL;
775
776static void ecard_proc_init(void)
777{
778 proc_bus_ecard_dir = proc_mkdir("bus/ecard", NULL);
779 proc_create("devices", 0, proc_bus_ecard_dir, &bus_ecard_proc_fops);
780}
781
782#define ec_set_resource(ec,nr,st,sz) \
783 do { \
784 (ec)->resource[nr].name = dev_name(&ec->dev); \
785 (ec)->resource[nr].start = st; \
786 (ec)->resource[nr].end = (st) + (sz) - 1; \
787 (ec)->resource[nr].flags = IORESOURCE_MEM; \
788 } while (0)
789
790static void __init ecard_free_card(struct expansion_card *ec)
791{
792 int i;
793
794 for (i = 0; i < ECARD_NUM_RESOURCES; i++)
795 if (ec->resource[i].flags)
796 release_resource(&ec->resource[i]);
797
798 kfree(ec);
799}
800
801static struct expansion_card *__init ecard_alloc_card(int type, int slot)
802{
803 struct expansion_card *ec;
804 unsigned long base;
805 int i;
806
807 ec = kzalloc(sizeof(ecard_t), GFP_KERNEL);
808 if (!ec) {
809 ec = ERR_PTR(-ENOMEM);
810 goto nomem;
811 }
812
813 ec->slot_no = slot;
814 ec->easi = type == ECARD_EASI;
815 ec->irq = NO_IRQ;
816 ec->fiq = NO_IRQ;
817 ec->dma = NO_DMA;
818 ec->ops = &ecard_default_ops;
819
820 dev_set_name(&ec->dev, "ecard%d", slot);
821 ec->dev.parent = NULL;
822 ec->dev.bus = &ecard_bus_type;
823 ec->dev.dma_mask = &ec->dma_mask;
824 ec->dma_mask = (u64)0xffffffff;
825 ec->dev.coherent_dma_mask = ec->dma_mask;
826
827 if (slot < 4) {
828 ec_set_resource(ec, ECARD_RES_MEMC,
829 PODSLOT_MEMC_BASE + (slot << 14),
830 PODSLOT_MEMC_SIZE);
831 base = PODSLOT_IOC0_BASE + (slot << 14);
832 } else
833 base = PODSLOT_IOC4_BASE + ((slot - 4) << 14);
834
835#ifdef CONFIG_ARCH_RPC
836 if (slot < 8) {
837 ec_set_resource(ec, ECARD_RES_EASI,
838 PODSLOT_EASI_BASE + (slot << 24),
839 PODSLOT_EASI_SIZE);
840 }
841
842 if (slot == 8) {
843 ec_set_resource(ec, ECARD_RES_MEMC, NETSLOT_BASE, NETSLOT_SIZE);
844 } else
845#endif
846
847 for (i = 0; i <= ECARD_RES_IOCSYNC - ECARD_RES_IOCSLOW; i++)
848 ec_set_resource(ec, i + ECARD_RES_IOCSLOW,
849 base + (i << 19), PODSLOT_IOC_SIZE);
850
851 for (i = 0; i < ECARD_NUM_RESOURCES; i++) {
852 if (ec->resource[i].flags &&
853 request_resource(&iomem_resource, &ec->resource[i])) {
854 dev_err(&ec->dev, "resource(s) not available\n");
855 ec->resource[i].end -= ec->resource[i].start;
856 ec->resource[i].start = 0;
857 ec->resource[i].flags = 0;
858 }
859 }
860
861 nomem:
862 return ec;
863}
864
865static ssize_t ecard_show_irq(struct device *dev, struct device_attribute *attr, char *buf)
866{
867 struct expansion_card *ec = ECARD_DEV(dev);
868 return sprintf(buf, "%u\n", ec->irq);
869}
870
871static ssize_t ecard_show_dma(struct device *dev, struct device_attribute *attr, char *buf)
872{
873 struct expansion_card *ec = ECARD_DEV(dev);
874 return sprintf(buf, "%u\n", ec->dma);
875}
876
877static ssize_t ecard_show_resources(struct device *dev, struct device_attribute *attr, char *buf)
878{
879 struct expansion_card *ec = ECARD_DEV(dev);
880 char *str = buf;
881 int i;
882
883 for (i = 0; i < ECARD_NUM_RESOURCES; i++)
884 str += sprintf(str, "%08x %08x %08lx\n",
885 ec->resource[i].start,
886 ec->resource[i].end,
887 ec->resource[i].flags);
888
889 return str - buf;
890}
891
892static ssize_t ecard_show_vendor(struct device *dev, struct device_attribute *attr, char *buf)
893{
894 struct expansion_card *ec = ECARD_DEV(dev);
895 return sprintf(buf, "%u\n", ec->cid.manufacturer);
896}
897
898static ssize_t ecard_show_device(struct device *dev, struct device_attribute *attr, char *buf)
899{
900 struct expansion_card *ec = ECARD_DEV(dev);
901 return sprintf(buf, "%u\n", ec->cid.product);
902}
903
904static ssize_t ecard_show_type(struct device *dev, struct device_attribute *attr, char *buf)
905{
906 struct expansion_card *ec = ECARD_DEV(dev);
907 return sprintf(buf, "%s\n", ec->easi ? "EASI" : "IOC");
908}
909
910static struct device_attribute ecard_dev_attrs[] = {
911 __ATTR(device, S_IRUGO, ecard_show_device, NULL),
912 __ATTR(dma, S_IRUGO, ecard_show_dma, NULL),
913 __ATTR(irq, S_IRUGO, ecard_show_irq, NULL),
914 __ATTR(resource, S_IRUGO, ecard_show_resources, NULL),
915 __ATTR(type, S_IRUGO, ecard_show_type, NULL),
916 __ATTR(vendor, S_IRUGO, ecard_show_vendor, NULL),
917 __ATTR_NULL,
918};
919
920
921int ecard_request_resources(struct expansion_card *ec)
922{
923 int i, err = 0;
924
925 for (i = 0; i < ECARD_NUM_RESOURCES; i++) {
926 if (ecard_resource_end(ec, i) &&
927 !request_mem_region(ecard_resource_start(ec, i),
928 ecard_resource_len(ec, i),
929 ec->dev.driver->name)) {
930 err = -EBUSY;
931 break;
932 }
933 }
934
935 if (err) {
936 while (i--)
937 if (ecard_resource_end(ec, i))
938 release_mem_region(ecard_resource_start(ec, i),
939 ecard_resource_len(ec, i));
940 }
941 return err;
942}
943EXPORT_SYMBOL(ecard_request_resources);
944
945void ecard_release_resources(struct expansion_card *ec)
946{
947 int i;
948
949 for (i = 0; i < ECARD_NUM_RESOURCES; i++)
950 if (ecard_resource_end(ec, i))
951 release_mem_region(ecard_resource_start(ec, i),
952 ecard_resource_len(ec, i));
953}
954EXPORT_SYMBOL(ecard_release_resources);
955
956void ecard_setirq(struct expansion_card *ec, const struct expansion_card_ops *ops, void *irq_data)
957{
958 ec->irq_data = irq_data;
959 barrier();
960 ec->ops = ops;
961}
962EXPORT_SYMBOL(ecard_setirq);
963
964void __iomem *ecardm_iomap(struct expansion_card *ec, unsigned int res,
965 unsigned long offset, unsigned long maxsize)
966{
967 unsigned long start = ecard_resource_start(ec, res);
968 unsigned long end = ecard_resource_end(ec, res);
969
970 if (offset > (end - start))
971 return NULL;
972
973 start += offset;
974 if (maxsize && end - start > maxsize)
975 end = start + maxsize;
976
977 return devm_ioremap(&ec->dev, start, end - start);
978}
979EXPORT_SYMBOL(ecardm_iomap);
980
981/*
982 * Probe for an expansion card.
983 *
984 * If bit 1 of the first byte of the card is set, then the
985 * card does not exist.
986 */
987static int __init
988ecard_probe(int slot, card_type_t type)
989{
990 ecard_t **ecp;
991 ecard_t *ec;
992 struct ex_ecid cid;
993 int i, rc;
994
995 ec = ecard_alloc_card(type, slot);
996 if (IS_ERR(ec)) {
997 rc = PTR_ERR(ec);
998 goto nomem;
999 }
1000
1001 rc = -ENODEV;
1002 if ((ec->podaddr = __ecard_address(ec, type, ECARD_SYNC)) == 0)
1003 goto nodev;
1004
1005 cid.r_zero = 1;
1006 ecard_readbytes(&cid, ec, 0, 16, 0);
1007 if (cid.r_zero)
1008 goto nodev;
1009
1010 ec->cid.id = cid.r_id;
1011 ec->cid.cd = cid.r_cd;
1012 ec->cid.is = cid.r_is;
1013 ec->cid.w = cid.r_w;
1014 ec->cid.manufacturer = ecard_getu16(cid.r_manu);
1015 ec->cid.product = ecard_getu16(cid.r_prod);
1016 ec->cid.country = cid.r_country;
1017 ec->cid.irqmask = cid.r_irqmask;
1018 ec->cid.irqoff = ecard_gets24(cid.r_irqoff);
1019 ec->cid.fiqmask = cid.r_fiqmask;
1020 ec->cid.fiqoff = ecard_gets24(cid.r_fiqoff);
1021 ec->fiqaddr =
1022 ec->irqaddr = (void __iomem *)ioaddr(ec->podaddr);
1023
1024 if (ec->cid.is) {
1025 ec->irqmask = ec->cid.irqmask;
1026 ec->irqaddr += ec->cid.irqoff;
1027 ec->fiqmask = ec->cid.fiqmask;
1028 ec->fiqaddr += ec->cid.fiqoff;
1029 } else {
1030 ec->irqmask = 1;
1031 ec->fiqmask = 4;
1032 }
1033
1034 for (i = 0; i < ARRAY_SIZE(blacklist); i++)
1035 if (blacklist[i].manufacturer == ec->cid.manufacturer &&
1036 blacklist[i].product == ec->cid.product) {
1037 ec->card_desc = blacklist[i].type;
1038 break;
1039 }
1040
1041 /*
1042 * hook the interrupt handlers
1043 */
1044 if (slot < 8) {
1045 ec->irq = 32 + slot;
1046 irq_set_chip_and_handler(ec->irq, &ecard_chip,
1047 handle_level_irq);
1048 set_irq_flags(ec->irq, IRQF_VALID);
1049 }
1050
1051#ifdef IO_EC_MEMC8_BASE
1052 if (slot == 8)
1053 ec->irq = 11;
1054#endif
1055#ifdef CONFIG_ARCH_RPC
1056 /* On RiscPC, only first two slots have DMA capability */
1057 if (slot < 2)
1058 ec->dma = 2 + slot;
1059#endif
1060
1061 for (ecp = &cards; *ecp; ecp = &(*ecp)->next);
1062
1063 *ecp = ec;
1064 slot_to_expcard[slot] = ec;
1065
1066 device_register(&ec->dev);
1067
1068 return 0;
1069
1070 nodev:
1071 ecard_free_card(ec);
1072 nomem:
1073 return rc;
1074}
1075
1076/*
1077 * Initialise the expansion card system.
1078 * Locate all hardware - interrupt management and
1079 * actual cards.
1080 */
1081static int __init ecard_init(void)
1082{
1083 struct task_struct *task;
1084 int slot, irqhw;
1085
1086 task = kthread_run(ecard_task, NULL, "kecardd");
1087 if (IS_ERR(task)) {
1088 printk(KERN_ERR "Ecard: unable to create kernel thread: %ld\n",
1089 PTR_ERR(task));
1090 return PTR_ERR(task);
1091 }
1092
1093 printk("Probing expansion cards\n");
1094
1095 for (slot = 0; slot < 8; slot ++) {
1096 if (ecard_probe(slot, ECARD_EASI) == -ENODEV)
1097 ecard_probe(slot, ECARD_IOC);
1098 }
1099
1100#ifdef IO_EC_MEMC8_BASE
1101 ecard_probe(8, ECARD_IOC);
1102#endif
1103
1104 irqhw = ecard_probeirqhw();
1105
1106 irq_set_chained_handler(IRQ_EXPANSIONCARD,
1107 irqhw ? ecard_irqexp_handler : ecard_irq_handler);
1108
1109 ecard_proc_init();
1110
1111 return 0;
1112}
1113
1114subsys_initcall(ecard_init);
1115
1116/*
1117 * ECARD "bus"
1118 */
1119static const struct ecard_id *
1120ecard_match_device(const struct ecard_id *ids, struct expansion_card *ec)
1121{
1122 int i;
1123
1124 for (i = 0; ids[i].manufacturer != 65535; i++)
1125 if (ec->cid.manufacturer == ids[i].manufacturer &&
1126 ec->cid.product == ids[i].product)
1127 return ids + i;
1128
1129 return NULL;
1130}
1131
1132static int ecard_drv_probe(struct device *dev)
1133{
1134 struct expansion_card *ec = ECARD_DEV(dev);
1135 struct ecard_driver *drv = ECARD_DRV(dev->driver);
1136 const struct ecard_id *id;
1137 int ret;
1138
1139 id = ecard_match_device(drv->id_table, ec);
1140
1141 ec->claimed = 1;
1142 ret = drv->probe(ec, id);
1143 if (ret)
1144 ec->claimed = 0;
1145 return ret;
1146}
1147
1148static int ecard_drv_remove(struct device *dev)
1149{
1150 struct expansion_card *ec = ECARD_DEV(dev);
1151 struct ecard_driver *drv = ECARD_DRV(dev->driver);
1152
1153 drv->remove(ec);
1154 ec->claimed = 0;
1155
1156 /*
1157 * Restore the default operations. We ensure that the
1158 * ops are set before we change the data.
1159 */
1160 ec->ops = &ecard_default_ops;
1161 barrier();
1162 ec->irq_data = NULL;
1163
1164 return 0;
1165}
1166
1167/*
1168 * Before rebooting, we must make sure that the expansion card is in a
1169 * sensible state, so it can be re-detected. This means that the first
1170 * page of the ROM must be visible. We call the expansion cards reset
1171 * handler, if any.
1172 */
1173static void ecard_drv_shutdown(struct device *dev)
1174{
1175 struct expansion_card *ec = ECARD_DEV(dev);
1176 struct ecard_driver *drv = ECARD_DRV(dev->driver);
1177 struct ecard_request req;
1178
1179 if (dev->driver) {
1180 if (drv->shutdown)
1181 drv->shutdown(ec);
1182 ec->claimed = 0;
1183 }
1184
1185 /*
1186 * If this card has a loader, call the reset handler.
1187 */
1188 if (ec->loader) {
1189 req.fn = ecard_task_reset;
1190 req.ec = ec;
1191 ecard_call(&req);
1192 }
1193}
1194
1195int ecard_register_driver(struct ecard_driver *drv)
1196{
1197 drv->drv.bus = &ecard_bus_type;
1198
1199 return driver_register(&drv->drv);
1200}
1201
1202void ecard_remove_driver(struct ecard_driver *drv)
1203{
1204 driver_unregister(&drv->drv);
1205}
1206
1207static int ecard_match(struct device *_dev, struct device_driver *_drv)
1208{
1209 struct expansion_card *ec = ECARD_DEV(_dev);
1210 struct ecard_driver *drv = ECARD_DRV(_drv);
1211 int ret;
1212
1213 if (drv->id_table) {
1214 ret = ecard_match_device(drv->id_table, ec) != NULL;
1215 } else {
1216 ret = ec->cid.id == drv->id;
1217 }
1218
1219 return ret;
1220}
1221
1222struct bus_type ecard_bus_type = {
1223 .name = "ecard",
1224 .dev_attrs = ecard_dev_attrs,
1225 .match = ecard_match,
1226 .probe = ecard_drv_probe,
1227 .remove = ecard_drv_remove,
1228 .shutdown = ecard_drv_shutdown,
1229};
1230
1231static int ecard_bus_init(void)
1232{
1233 return bus_register(&ecard_bus_type);
1234}
1235
1236postcore_initcall(ecard_bus_init);
1237
1238EXPORT_SYMBOL(ecard_readchunk);
1239EXPORT_SYMBOL(ecard_register_driver);
1240EXPORT_SYMBOL(ecard_remove_driver);
1241EXPORT_SYMBOL(ecard_bus_type);