1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * linux/arch/arm/kernel/ecard.c
4 *
5 * Copyright 1995-2001 Russell King
6 *
7 * Find all installed expansion cards, and handle interrupts from them.
8 *
9 * Created from information from Acorns RiscOS3 PRMs
10 *
11 * 08-Dec-1996 RMK Added code for the 9'th expansion card - the ether
12 * podule slot.
13 * 06-May-1997 RMK Added blacklist for cards whose loader doesn't work.
14 * 12-Sep-1997 RMK Created new handling of interrupt enables/disables
15 * - cards can now register their own routine to control
16 * interrupts (recommended).
17 * 29-Sep-1997 RMK Expansion card interrupt hardware not being re-enabled
18 * on reset from Linux. (Caused cards not to respond
19 * under RiscOS without hard reset).
20 * 15-Feb-1998 RMK Added DMA support
21 * 12-Sep-1998 RMK Added EASI support
22 * 10-Jan-1999 RMK Run loaders in a simulated RISC OS environment.
23 * 17-Apr-1999 RMK Support for EASI Type C cycles.
24 */
25 #define ECARD_C
26
27 #include <linux/module.h>
28 #include <linux/kernel.h>
29 #include <linux/types.h>
30 #include <linux/sched.h>
31 #include <linux/sched/mm.h>
32 #include <linux/interrupt.h>
33 #include <linux/completion.h>
34 #include <linux/reboot.h>
35 #include <linux/mm.h>
36 #include <linux/slab.h>
37 #include <linux/proc_fs.h>
38 #include <linux/seq_file.h>
39 #include <linux/device.h>
40 #include <linux/init.h>
41 #include <linux/mutex.h>
42 #include <linux/kthread.h>
43 #include <linux/irq.h>
44 #include <linux/io.h>
45
46 #include <asm/dma.h>
47 #include <asm/ecard.h>
48 #include <mach/hardware.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 #include "ecard.h"
55
56 struct ecard_request {
57 void (*fn)(struct ecard_request *);
58 ecard_t *ec;
59 unsigned int address;
60 unsigned int length;
61 unsigned int use_loader;
62 void *buffer;
63 struct completion *complete;
64 };
65
66 struct expcard_quirklist {
67 unsigned short manufacturer;
68 unsigned short product;
69 const char *type;
70 void (*init)(ecard_t *ec);
71 };
72
73 static ecard_t *cards;
74 static ecard_t *slot_to_expcard[MAX_ECARDS];
75 static unsigned int ectcr;
76
77 static void atomwide_3p_quirk(ecard_t *ec);
78
79 /* List of descriptions of cards which don't have an extended
80 * identification, or chunk directories containing a description.
81 */
82 static struct expcard_quirklist quirklist[] __initdata = {
83 { MANU_ACORN, PROD_ACORN_ETHER1, "Acorn Ether1" },
84 { MANU_ATOMWIDE, PROD_ATOMWIDE_3PSERIAL, NULL, atomwide_3p_quirk },
85 };
86
87 asmlinkage extern int
88 ecard_loader_reset(unsigned long base, loader_t loader);
89 asmlinkage extern int
90 ecard_loader_read(int off, unsigned long base, loader_t loader);
91
92 static inline unsigned short ecard_getu16(unsigned char *v)
93 {
94 return v[0] | v[1] << 8;
95 }
96
97 static 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
102 static 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 */
119 static 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->easi
127 ? &ec->resource[ECARD_RES_EASI]
128 : &ec->resource[ECARD_RES_IOCSYNC];
129
130 ecard_loader_reset(res->start, ec->loader);
131 }
132
133 static 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->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
207 static DECLARE_WAIT_QUEUE_HEAD(ecard_wait);
208 static struct ecard_request *ecard_req;
209 static DEFINE_MUTEX(ecard_mutex);
210
211 /*
212 * Set up the expansion card daemon's page tables.
213 */
214 static void ecard_init_pgtables(struct mm_struct *mm)
215 {
216 struct vm_area_struct vma = TLB_FLUSH_VMA(mm, VM_EXEC);
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, (unsigned long)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 flush_tlb_range(&vma, IO_START, IO_START + IO_SIZE);
242 flush_tlb_range(&vma, EASI_START, EASI_START + EASI_SIZE);
243 }
244
245 static int ecard_init_mm(void)
246 {
247 struct mm_struct * mm = mm_alloc();
248 struct mm_struct *active_mm = current->active_mm;
249
250 if (!mm)
251 return -ENOMEM;
252
253 current->mm = mm;
254 current->active_mm = mm;
255 activate_mm(active_mm, mm);
256 mmdrop_lazy_tlb(active_mm);
257 ecard_init_pgtables(mm);
258 return 0;
259 }
260
261 static int
262 ecard_task(void * unused)
263 {
264 /*
265 * Allocate a mm. We're not a lazy-TLB kernel task since we need
266 * to set page table entries where the user space would be. Note
267 * that this also creates the page tables. Failure is not an
268 * option here.
269 */
270 if (ecard_init_mm())
271 panic("kecardd: unable to alloc mm\n");
272
273 while (1) {
274 struct ecard_request *req;
275
276 wait_event_interruptible(ecard_wait, ecard_req != NULL);
277
278 req = xchg(&ecard_req, NULL);
279 if (req != NULL) {
280 req->fn(req);
281 complete(req->complete);
282 }
283 }
284 }
285
286 /*
287 * Wake the expansion card daemon to action our request.
288 *
289 * FIXME: The test here is not sufficient to detect if the
290 * kcardd is running.
291 */
292 static void ecard_call(struct ecard_request *req)
293 {
294 DECLARE_COMPLETION_ONSTACK(completion);
295
296 req->complete = &completion;
297
298 mutex_lock(&ecard_mutex);
299 ecard_req = req;
300 wake_up(&ecard_wait);
301
302 /*
303 * Now wait for kecardd to run.
304 */
305 wait_for_completion(&completion);
306 mutex_unlock(&ecard_mutex);
307 }
308
309 /* ======================= Mid-level card control ===================== */
310
311 static void
312 ecard_readbytes(void *addr, ecard_t *ec, int off, int len, int useld)
313 {
314 struct ecard_request req;
315
316 req.fn = ecard_task_readbytes;
317 req.ec = ec;
318 req.address = off;
319 req.length = len;
320 req.use_loader = useld;
321 req.buffer = addr;
322
323 ecard_call(&req);
324 }
325
326 int ecard_readchunk(struct in_chunk_dir *cd, ecard_t *ec, int id, int num)
327 {
328 struct ex_chunk_dir excd;
329 int index = 16;
330 int useld = 0;
331
332 if (!ec->cid.cd)
333 return 0;
334
335 while(1) {
336 ecard_readbytes(&excd, ec, index, 8, useld);
337 index += 8;
338 if (c_id(&excd) == 0) {
339 if (!useld && ec->loader) {
340 useld = 1;
341 index = 0;
342 continue;
343 }
344 return 0;
345 }
346 if (c_id(&excd) == 0xf0) { /* link */
347 index = c_start(&excd);
348 continue;
349 }
350 if (c_id(&excd) == 0x80) { /* loader */
351 if (!ec->loader) {
352 ec->loader = kmalloc(c_len(&excd),
353 GFP_KERNEL);
354 if (ec->loader)
355 ecard_readbytes(ec->loader, ec,
356 (int)c_start(&excd),
357 c_len(&excd), useld);
358 else
359 return 0;
360 }
361 continue;
362 }
363 if (c_id(&excd) == id && num-- == 0)
364 break;
365 }
366
367 if (c_id(&excd) & 0x80) {
368 switch (c_id(&excd) & 0x70) {
369 case 0x70:
370 ecard_readbytes((unsigned char *)excd.d.string, ec,
371 (int)c_start(&excd), c_len(&excd),
372 useld);
373 break;
374 case 0x00:
375 break;
376 }
377 }
378 cd->start_offset = c_start(&excd);
379 memcpy(cd->d.string, excd.d.string, 256);
380 return 1;
381 }
382
383 /* ======================= Interrupt control ============================ */
384
385 static void ecard_def_irq_enable(ecard_t *ec, int irqnr)
386 {
387 }
388
389 static void ecard_def_irq_disable(ecard_t *ec, int irqnr)
390 {
391 }
392
393 static int ecard_def_irq_pending(ecard_t *ec)
394 {
395 return !ec->irqmask || readb(ec->irqaddr) & ec->irqmask;
396 }
397
398 static void ecard_def_fiq_enable(ecard_t *ec, int fiqnr)
399 {
400 panic("ecard_def_fiq_enable called - impossible");
401 }
402
403 static void ecard_def_fiq_disable(ecard_t *ec, int fiqnr)
404 {
405 panic("ecard_def_fiq_disable called - impossible");
406 }
407
408 static int ecard_def_fiq_pending(ecard_t *ec)
409 {
410 return !ec->fiqmask || readb(ec->fiqaddr) & ec->fiqmask;
411 }
412
413 static expansioncard_ops_t ecard_default_ops = {
414 ecard_def_irq_enable,
415 ecard_def_irq_disable,
416 ecard_def_irq_pending,
417 ecard_def_fiq_enable,
418 ecard_def_fiq_disable,
419 ecard_def_fiq_pending
420 };
421
422 /*
423 * Enable and disable interrupts from expansion cards.
424 * (interrupts are disabled for these functions).
425 *
426 * They are not meant to be called directly, but via enable/disable_irq.
427 */
428 static void ecard_irq_unmask(struct irq_data *d)
429 {
430 ecard_t *ec = irq_data_get_irq_chip_data(d);
431
432 if (ec) {
433 if (!ec->ops)
434 ec->ops = &ecard_default_ops;
435
436 if (ec->claimed && ec->ops->irqenable)
437 ec->ops->irqenable(ec, d->irq);
438 else
439 printk(KERN_ERR "ecard: rejecting request to "
440 "enable IRQs for %d\n", d->irq);
441 }
442 }
443
444 static void ecard_irq_mask(struct irq_data *d)
445 {
446 ecard_t *ec = irq_data_get_irq_chip_data(d);
447
448 if (ec) {
449 if (!ec->ops)
450 ec->ops = &ecard_default_ops;
451
452 if (ec->ops && ec->ops->irqdisable)
453 ec->ops->irqdisable(ec, d->irq);
454 }
455 }
456
457 static struct irq_chip ecard_chip = {
458 .name = "ECARD",
459 .irq_ack = ecard_irq_mask,
460 .irq_mask = ecard_irq_mask,
461 .irq_unmask = ecard_irq_unmask,
462 };
463
464 void ecard_enablefiq(unsigned int fiqnr)
465 {
466 ecard_t *ec = slot_to_ecard(fiqnr);
467
468 if (ec) {
469 if (!ec->ops)
470 ec->ops = &ecard_default_ops;
471
472 if (ec->claimed && ec->ops->fiqenable)
473 ec->ops->fiqenable(ec, fiqnr);
474 else
475 printk(KERN_ERR "ecard: rejecting request to "
476 "enable FIQs for %d\n", fiqnr);
477 }
478 }
479
480 void ecard_disablefiq(unsigned int fiqnr)
481 {
482 ecard_t *ec = slot_to_ecard(fiqnr);
483
484 if (ec) {
485 if (!ec->ops)
486 ec->ops = &ecard_default_ops;
487
488 if (ec->ops->fiqdisable)
489 ec->ops->fiqdisable(ec, fiqnr);
490 }
491 }
492
493 static void ecard_dump_irq_state(void)
494 {
495 ecard_t *ec;
496
497 printk("Expansion card IRQ state:\n");
498
499 for (ec = cards; ec; ec = ec->next) {
500 const char *claimed;
501
502 if (ec->slot_no == 8)
503 continue;
504
505 claimed = ec->claimed ? "" : "not ";
506
507 if (ec->ops && ec->ops->irqpending &&
508 ec->ops != &ecard_default_ops)
509 printk(" %d: %sclaimed irq %spending\n",
510 ec->slot_no, claimed,
511 ec->ops->irqpending(ec) ? "" : "not ");
512 else
513 printk(" %d: %sclaimed irqaddr %p, mask = %02X, status = %02X\n",
514 ec->slot_no, claimed,
515 ec->irqaddr, ec->irqmask, readb(ec->irqaddr));
516 }
517 }
518
519 static void ecard_check_lockup(struct irq_desc *desc)
520 {
521 static unsigned long last;
522 static int lockup;
523
524 /*
525 * If the timer interrupt has not run since the last million
526 * unrecognised expansion card interrupts, then there is
527 * something seriously wrong. Disable the expansion card
528 * interrupts so at least we can continue.
529 *
530 * Maybe we ought to start a timer to re-enable them some time
531 * later?
532 */
533 if (last == jiffies) {
534 lockup += 1;
535 if (lockup > 1000000) {
536 printk(KERN_ERR "\nInterrupt lockup detected - "
537 "disabling all expansion card interrupts\n");
538
539 desc->irq_data.chip->irq_mask(&desc->irq_data);
540 ecard_dump_irq_state();
541 }
542 } else
543 lockup = 0;
544
545 /*
546 * If we did not recognise the source of this interrupt,
547 * warn the user, but don't flood the user with these messages.
548 */
549 if (!last || time_after(jiffies, last + 5*HZ)) {
550 last = jiffies;
551 printk(KERN_WARNING "Unrecognised interrupt from backplane\n");
552 ecard_dump_irq_state();
553 }
554 }
555
556 static void ecard_irq_handler(struct irq_desc *desc)
557 {
558 ecard_t *ec;
559 int called = 0;
560
561 desc->irq_data.chip->irq_mask(&desc->irq_data);
562 for (ec = cards; ec; ec = ec->next) {
563 int pending;
564
565 if (!ec->claimed || !ec->irq || ec->slot_no == 8)
566 continue;
567
568 if (ec->ops && ec->ops->irqpending)
569 pending = ec->ops->irqpending(ec);
570 else
571 pending = ecard_default_ops.irqpending(ec);
572
573 if (pending) {
574 generic_handle_irq(ec->irq);
575 called ++;
576 }
577 }
578 desc->irq_data.chip->irq_unmask(&desc->irq_data);
579
580 if (called == 0)
581 ecard_check_lockup(desc);
582 }
583
584 static void __iomem *__ecard_address(ecard_t *ec, card_type_t type, card_speed_t speed)
585 {
586 void __iomem *address = NULL;
587 int slot = ec->slot_no;
588
589 if (ec->slot_no == 8)
590 return ECARD_MEMC8_BASE;
591
592 ectcr &= ~(1 << slot);
593
594 switch (type) {
595 case ECARD_MEMC:
596 if (slot < 4)
597 address = ECARD_MEMC_BASE + (slot << 14);
598 break;
599
600 case ECARD_IOC:
601 if (slot < 4)
602 address = ECARD_IOC_BASE + (slot << 14);
603 else
604 address = ECARD_IOC4_BASE + ((slot - 4) << 14);
605 if (address)
606 address += speed << 19;
607 break;
608
609 case ECARD_EASI:
610 address = ECARD_EASI_BASE + (slot << 24);
611 if (speed == ECARD_FAST)
612 ectcr |= 1 << slot;
613 break;
614
615 default:
616 break;
617 }
618
619 #ifdef IOMD_ECTCR
620 iomd_writeb(ectcr, IOMD_ECTCR);
621 #endif
622 return address;
623 }
624
625 static int ecard_prints(struct seq_file *m, ecard_t *ec)
626 {
627 seq_printf(m, " %d: %s ", ec->slot_no, ec->easi ? "EASI" : " ");
628
629 if (ec->cid.id == 0) {
630 struct in_chunk_dir incd;
631
632 seq_printf(m, "[%04X:%04X] ",
633 ec->cid.manufacturer, ec->cid.product);
634
635 if (!ec->card_desc && ec->cid.cd &&
636 ecard_readchunk(&incd, ec, 0xf5, 0)) {
637 ec->card_desc = kmalloc(strlen(incd.d.string)+1, GFP_KERNEL);
638
639 if (ec->card_desc)
640 strcpy((char *)ec->card_desc, incd.d.string);
641 }
642
643 seq_printf(m, "%s\n", ec->card_desc ? ec->card_desc : "*unknown*");
644 } else
645 seq_printf(m, "Simple card %d\n", ec->cid.id);
646
647 return 0;
648 }
649
650 static int ecard_devices_proc_show(struct seq_file *m, void *v)
651 {
652 ecard_t *ec = cards;
653
654 while (ec) {
655 ecard_prints(m, ec);
656 ec = ec->next;
657 }
658 return 0;
659 }
660
661 static struct proc_dir_entry *proc_bus_ecard_dir = NULL;
662
663 static void ecard_proc_init(void)
664 {
665 proc_bus_ecard_dir = proc_mkdir("bus/ecard", NULL);
666 proc_create_single("devices", 0, proc_bus_ecard_dir,
667 ecard_devices_proc_show);
668 }
669
670 #define ec_set_resource(ec,nr,st,sz) \
671 do { \
672 (ec)->resource[nr].name = dev_name(&ec->dev); \
673 (ec)->resource[nr].start = st; \
674 (ec)->resource[nr].end = (st) + (sz) - 1; \
675 (ec)->resource[nr].flags = IORESOURCE_MEM; \
676 } while (0)
677
678 static void __init ecard_free_card(struct expansion_card *ec)
679 {
680 int i;
681
682 for (i = 0; i < ECARD_NUM_RESOURCES; i++)
683 if (ec->resource[i].flags)
684 release_resource(&ec->resource[i]);
685
686 kfree(ec);
687 }
688
689 static struct expansion_card *__init ecard_alloc_card(int type, int slot)
690 {
691 struct expansion_card *ec;
692 unsigned long base;
693 int i;
694
695 ec = kzalloc(sizeof(ecard_t), GFP_KERNEL);
696 if (!ec) {
697 ec = ERR_PTR(-ENOMEM);
698 goto nomem;
699 }
700
701 ec->slot_no = slot;
702 ec->easi = type == ECARD_EASI;
703 ec->irq = 0;
704 ec->fiq = 0;
705 ec->dma = NO_DMA;
706 ec->ops = &ecard_default_ops;
707
708 dev_set_name(&ec->dev, "ecard%d", slot);
709 ec->dev.parent = NULL;
710 ec->dev.bus = &ecard_bus_type;
711 ec->dev.dma_mask = &ec->dma_mask;
712 ec->dma_mask = (u64)0xffffffff;
713 ec->dev.coherent_dma_mask = ec->dma_mask;
714
715 if (slot < 4) {
716 ec_set_resource(ec, ECARD_RES_MEMC,
717 PODSLOT_MEMC_BASE + (slot << 14),
718 PODSLOT_MEMC_SIZE);
719 base = PODSLOT_IOC0_BASE + (slot << 14);
720 } else
721 base = PODSLOT_IOC4_BASE + ((slot - 4) << 14);
722
723 #ifdef CONFIG_ARCH_RPC
724 if (slot < 8) {
725 ec_set_resource(ec, ECARD_RES_EASI,
726 PODSLOT_EASI_BASE + (slot << 24),
727 PODSLOT_EASI_SIZE);
728 }
729
730 if (slot == 8) {
731 ec_set_resource(ec, ECARD_RES_MEMC, NETSLOT_BASE, NETSLOT_SIZE);
732 } else
733 #endif
734
735 for (i = 0; i <= ECARD_RES_IOCSYNC - ECARD_RES_IOCSLOW; i++)
736 ec_set_resource(ec, i + ECARD_RES_IOCSLOW,
737 base + (i << 19), PODSLOT_IOC_SIZE);
738
739 for (i = 0; i < ECARD_NUM_RESOURCES; i++) {
740 if (ec->resource[i].flags &&
741 request_resource(&iomem_resource, &ec->resource[i])) {
742 dev_err(&ec->dev, "resource(s) not available\n");
743 ec->resource[i].end -= ec->resource[i].start;
744 ec->resource[i].start = 0;
745 ec->resource[i].flags = 0;
746 }
747 }
748
749 nomem:
750 return ec;
751 }
752
753 static ssize_t irq_show(struct device *dev, struct device_attribute *attr, char *buf)
754 {
755 struct expansion_card *ec = ECARD_DEV(dev);
756 return sprintf(buf, "%u\n", ec->irq);
757 }
758 static DEVICE_ATTR_RO(irq);
759
760 static ssize_t dma_show(struct device *dev, struct device_attribute *attr, char *buf)
761 {
762 struct expansion_card *ec = ECARD_DEV(dev);
763 return sprintf(buf, "%u\n", ec->dma);
764 }
765 static DEVICE_ATTR_RO(dma);
766
767 static ssize_t resource_show(struct device *dev, struct device_attribute *attr, char *buf)
768 {
769 struct expansion_card *ec = ECARD_DEV(dev);
770 char *str = buf;
771 int i;
772
773 for (i = 0; i < ECARD_NUM_RESOURCES; i++)
774 str += sprintf(str, "%08x %08x %08lx\n",
775 ec->resource[i].start,
776 ec->resource[i].end,
777 ec->resource[i].flags);
778
779 return str - buf;
780 }
781 static DEVICE_ATTR_RO(resource);
782
783 static ssize_t vendor_show(struct device *dev, struct device_attribute *attr, char *buf)
784 {
785 struct expansion_card *ec = ECARD_DEV(dev);
786 return sprintf(buf, "%u\n", ec->cid.manufacturer);
787 }
788 static DEVICE_ATTR_RO(vendor);
789
790 static ssize_t device_show(struct device *dev, struct device_attribute *attr, char *buf)
791 {
792 struct expansion_card *ec = ECARD_DEV(dev);
793 return sprintf(buf, "%u\n", ec->cid.product);
794 }
795 static DEVICE_ATTR_RO(device);
796
797 static ssize_t type_show(struct device *dev, struct device_attribute *attr, char *buf)
798 {
799 struct expansion_card *ec = ECARD_DEV(dev);
800 return sprintf(buf, "%s\n", ec->easi ? "EASI" : "IOC");
801 }
802 static DEVICE_ATTR_RO(type);
803
804 static struct attribute *ecard_dev_attrs[] = {
805 &dev_attr_device.attr,
806 &dev_attr_dma.attr,
807 &dev_attr_irq.attr,
808 &dev_attr_resource.attr,
809 &dev_attr_type.attr,
810 &dev_attr_vendor.attr,
811 NULL,
812 };
813 ATTRIBUTE_GROUPS(ecard_dev);
814
815 int ecard_request_resources(struct expansion_card *ec)
816 {
817 int i, err = 0;
818
819 for (i = 0; i < ECARD_NUM_RESOURCES; i++) {
820 if (ecard_resource_end(ec, i) &&
821 !request_mem_region(ecard_resource_start(ec, i),
822 ecard_resource_len(ec, i),
823 ec->dev.driver->name)) {
824 err = -EBUSY;
825 break;
826 }
827 }
828
829 if (err) {
830 while (i--)
831 if (ecard_resource_end(ec, i))
832 release_mem_region(ecard_resource_start(ec, i),
833 ecard_resource_len(ec, i));
834 }
835 return err;
836 }
837 EXPORT_SYMBOL(ecard_request_resources);
838
839 void ecard_release_resources(struct expansion_card *ec)
840 {
841 int i;
842
843 for (i = 0; i < ECARD_NUM_RESOURCES; i++)
844 if (ecard_resource_end(ec, i))
845 release_mem_region(ecard_resource_start(ec, i),
846 ecard_resource_len(ec, i));
847 }
848 EXPORT_SYMBOL(ecard_release_resources);
849
850 void ecard_setirq(struct expansion_card *ec, const struct expansion_card_ops *ops, void *irq_data)
851 {
852 ec->irq_data = irq_data;
853 barrier();
854 ec->ops = ops;
855 }
856 EXPORT_SYMBOL(ecard_setirq);
857
858 void __iomem *ecardm_iomap(struct expansion_card *ec, unsigned int res,
859 unsigned long offset, unsigned long maxsize)
860 {
861 unsigned long start = ecard_resource_start(ec, res);
862 unsigned long end = ecard_resource_end(ec, res);
863
864 if (offset > (end - start))
865 return NULL;
866
867 start += offset;
868 if (maxsize && end - start > maxsize)
869 end = start + maxsize;
870
871 return devm_ioremap(&ec->dev, start, end - start);
872 }
873 EXPORT_SYMBOL(ecardm_iomap);
874
875 static void atomwide_3p_quirk(ecard_t *ec)
876 {
877 void __iomem *addr = __ecard_address(ec, ECARD_IOC, ECARD_SYNC);
878 unsigned int i;
879
880 /* Disable interrupts on each port */
881 for (i = 0x2000; i <= 0x2800; i += 0x0400)
882 writeb(0, addr + i + 4);
883 }
884
885 /*
886 * Probe for an expansion card.
887 *
888 * If bit 1 of the first byte of the card is set, then the
889 * card does not exist.
890 */
891 static int __init ecard_probe(int slot, unsigned irq, card_type_t type)
892 {
893 ecard_t **ecp;
894 ecard_t *ec;
895 struct ex_ecid cid;
896 void __iomem *addr;
897 int i, rc;
898
899 ec = ecard_alloc_card(type, slot);
900 if (IS_ERR(ec)) {
901 rc = PTR_ERR(ec);
902 goto nomem;
903 }
904
905 rc = -ENODEV;
906 if ((addr = __ecard_address(ec, type, ECARD_SYNC)) == NULL)
907 goto nodev;
908
909 cid.r_zero = 1;
910 ecard_readbytes(&cid, ec, 0, 16, 0);
911 if (cid.r_zero)
912 goto nodev;
913
914 ec->cid.id = cid.r_id;
915 ec->cid.cd = cid.r_cd;
916 ec->cid.is = cid.r_is;
917 ec->cid.w = cid.r_w;
918 ec->cid.manufacturer = ecard_getu16(cid.r_manu);
919 ec->cid.product = ecard_getu16(cid.r_prod);
920 ec->cid.country = cid.r_country;
921 ec->cid.irqmask = cid.r_irqmask;
922 ec->cid.irqoff = ecard_gets24(cid.r_irqoff);
923 ec->cid.fiqmask = cid.r_fiqmask;
924 ec->cid.fiqoff = ecard_gets24(cid.r_fiqoff);
925 ec->fiqaddr =
926 ec->irqaddr = addr;
927
928 if (ec->cid.is) {
929 ec->irqmask = ec->cid.irqmask;
930 ec->irqaddr += ec->cid.irqoff;
931 ec->fiqmask = ec->cid.fiqmask;
932 ec->fiqaddr += ec->cid.fiqoff;
933 } else {
934 ec->irqmask = 1;
935 ec->fiqmask = 4;
936 }
937
938 for (i = 0; i < ARRAY_SIZE(quirklist); i++)
939 if (quirklist[i].manufacturer == ec->cid.manufacturer &&
940 quirklist[i].product == ec->cid.product) {
941 if (quirklist[i].type)
942 ec->card_desc = quirklist[i].type;
943 if (quirklist[i].init)
944 quirklist[i].init(ec);
945 break;
946 }
947
948 ec->irq = irq;
949
950 /*
951 * hook the interrupt handlers
952 */
953 if (slot < 8) {
954 irq_set_chip_and_handler(ec->irq, &ecard_chip,
955 handle_level_irq);
956 irq_set_chip_data(ec->irq, ec);
957 irq_clear_status_flags(ec->irq, IRQ_NOREQUEST);
958 }
959
960 #ifdef CONFIG_ARCH_RPC
961 /* On RiscPC, only first two slots have DMA capability */
962 if (slot < 2)
963 ec->dma = 2 + slot;
964 #endif
965
966 for (ecp = &cards; *ecp; ecp = &(*ecp)->next);
967
968 *ecp = ec;
969 slot_to_expcard[slot] = ec;
970
971 rc = device_register(&ec->dev);
972 if (rc)
973 goto nodev;
974
975 return 0;
976
977 nodev:
978 ecard_free_card(ec);
979 nomem:
980 return rc;
981 }
982
983 /*
984 * Initialise the expansion card system.
985 * Locate all hardware - interrupt management and
986 * actual cards.
987 */
988 static int __init ecard_init(void)
989 {
990 struct task_struct *task;
991 int slot, irqbase;
992
993 irqbase = irq_alloc_descs(-1, 0, 8, -1);
994 if (irqbase < 0)
995 return irqbase;
996
997 task = kthread_run(ecard_task, NULL, "kecardd");
998 if (IS_ERR(task)) {
999 printk(KERN_ERR "Ecard: unable to create kernel thread: %ld\n",
1000 PTR_ERR(task));
1001 irq_free_descs(irqbase, 8);
1002 return PTR_ERR(task);
1003 }
1004
1005 printk("Probing expansion cards\n");
1006
1007 for (slot = 0; slot < 8; slot ++) {
1008 if (ecard_probe(slot, irqbase + slot, ECARD_EASI) == -ENODEV)
1009 ecard_probe(slot, irqbase + slot, ECARD_IOC);
1010 }
1011
1012 ecard_probe(8, 11, ECARD_IOC);
1013
1014 irq_set_chained_handler(IRQ_EXPANSIONCARD, ecard_irq_handler);
1015
1016 ecard_proc_init();
1017
1018 return 0;
1019 }
1020
1021 subsys_initcall(ecard_init);
1022
1023 /*
1024 * ECARD "bus"
1025 */
1026 static const struct ecard_id *
1027 ecard_match_device(const struct ecard_id *ids, struct expansion_card *ec)
1028 {
1029 int i;
1030
1031 for (i = 0; ids[i].manufacturer != 65535; i++)
1032 if (ec->cid.manufacturer == ids[i].manufacturer &&
1033 ec->cid.product == ids[i].product)
1034 return ids + i;
1035
1036 return NULL;
1037 }
1038
1039 static int ecard_drv_probe(struct device *dev)
1040 {
1041 struct expansion_card *ec = ECARD_DEV(dev);
1042 struct ecard_driver *drv = ECARD_DRV(dev->driver);
1043 const struct ecard_id *id;
1044 int ret;
1045
1046 id = ecard_match_device(drv->id_table, ec);
1047
1048 ec->claimed = 1;
1049 ret = drv->probe(ec, id);
1050 if (ret)
1051 ec->claimed = 0;
1052 return ret;
1053 }
1054
1055 static void ecard_drv_remove(struct device *dev)
1056 {
1057 struct expansion_card *ec = ECARD_DEV(dev);
1058 struct ecard_driver *drv = ECARD_DRV(dev->driver);
1059
1060 drv->remove(ec);
1061 ec->claimed = 0;
1062
1063 /*
1064 * Restore the default operations. We ensure that the
1065 * ops are set before we change the data.
1066 */
1067 ec->ops = &ecard_default_ops;
1068 barrier();
1069 ec->irq_data = NULL;
1070 }
1071
1072 /*
1073 * Before rebooting, we must make sure that the expansion card is in a
1074 * sensible state, so it can be re-detected. This means that the first
1075 * page of the ROM must be visible. We call the expansion cards reset
1076 * handler, if any.
1077 */
1078 static void ecard_drv_shutdown(struct device *dev)
1079 {
1080 struct expansion_card *ec = ECARD_DEV(dev);
1081 struct ecard_driver *drv = ECARD_DRV(dev->driver);
1082 struct ecard_request req;
1083
1084 if (dev->driver) {
1085 if (drv->shutdown)
1086 drv->shutdown(ec);
1087 ec->claimed = 0;
1088 }
1089
1090 /*
1091 * If this card has a loader, call the reset handler.
1092 */
1093 if (ec->loader) {
1094 req.fn = ecard_task_reset;
1095 req.ec = ec;
1096 ecard_call(&req);
1097 }
1098 }
1099
1100 int ecard_register_driver(struct ecard_driver *drv)
1101 {
1102 drv->drv.bus = &ecard_bus_type;
1103
1104 return driver_register(&drv->drv);
1105 }
1106
1107 void ecard_remove_driver(struct ecard_driver *drv)
1108 {
1109 driver_unregister(&drv->drv);
1110 }
1111
1112 static int ecard_match(struct device *_dev, const struct device_driver *_drv)
1113 {
1114 struct expansion_card *ec = ECARD_DEV(_dev);
1115 struct ecard_driver *drv = ECARD_DRV(_drv);
1116 int ret;
1117
1118 if (drv->id_table) {
1119 ret = ecard_match_device(drv->id_table, ec) != NULL;
1120 } else {
1121 ret = ec->cid.id == drv->id;
1122 }
1123
1124 return ret;
1125 }
1126
1127 struct bus_type ecard_bus_type = {
1128 .name = "ecard",
1129 .dev_groups = ecard_dev_groups,
1130 .match = ecard_match,
1131 .probe = ecard_drv_probe,
1132 .remove = ecard_drv_remove,
1133 .shutdown = ecard_drv_shutdown,
1134 };
1135
1136 static int ecard_bus_init(void)
1137 {
1138 return bus_register(&ecard_bus_type);
1139 }
1140
1141 postcore_initcall(ecard_bus_init);
1142
1143 EXPORT_SYMBOL(ecard_readchunk);
1144 EXPORT_SYMBOL(ecard_register_driver);
1145 EXPORT_SYMBOL(ecard_remove_driver);
1146 EXPORT_SYMBOL(ecard_bus_type);
1147
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