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/arch/arm/mach-rpc/ecard.c

https://github.com/gby/linux
C | 1146 lines | 816 code | 190 blank | 140 comment | 144 complexity | ee050150f9771e1ba431a432f503c972 MD5 | raw file
   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/sched/mm.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/seq_file.h>
  42#include <linux/device.h>
  43#include <linux/init.h>
  44#include <linux/mutex.h>
  45#include <linux/kthread.h>
  46#include <linux/irq.h>
  47#include <linux/io.h>
  48
  49#include <asm/dma.h>
  50#include <asm/ecard.h>
  51#include <mach/hardware.h>
  52#include <asm/irq.h>
  53#include <asm/mmu_context.h>
  54#include <asm/mach/irq.h>
  55#include <asm/tlbflush.h>
  56
  57#include "ecard.h"
  58
  59struct ecard_request {
  60	void		(*fn)(struct ecard_request *);
  61	ecard_t		*ec;
  62	unsigned int	address;
  63	unsigned int	length;
  64	unsigned int	use_loader;
  65	void		*buffer;
  66	struct completion *complete;
  67};
  68
  69struct expcard_blacklist {
  70	unsigned short	 manufacturer;
  71	unsigned short	 product;
  72	const char	*type;
  73};
  74
  75static ecard_t *cards;
  76static ecard_t *slot_to_expcard[MAX_ECARDS];
  77static unsigned int ectcr;
  78
  79/* List of descriptions of cards which don't have an extended
  80 * identification, or chunk directories containing a description.
  81 */
  82static struct expcard_blacklist __initdata blacklist[] = {
  83	{ MANU_ACORN, PROD_ACORN_ETHER1, "Acorn Ether1" }
  84};
  85
  86asmlinkage extern int
  87ecard_loader_reset(unsigned long base, loader_t loader);
  88asmlinkage extern int
  89ecard_loader_read(int off, unsigned long base, loader_t loader);
  90
  91static inline unsigned short ecard_getu16(unsigned char *v)
  92{
  93	return v[0] | v[1] << 8;
  94}
  95
  96static inline signed long ecard_gets24(unsigned char *v)
  97{
  98	return v[0] | v[1] << 8 | v[2] << 16 | ((v[2] & 0x80) ? 0xff000000 : 0);
  99}
 100
 101static inline ecard_t *slot_to_ecard(unsigned int slot)
 102{
 103	return slot < MAX_ECARDS ? slot_to_expcard[slot] : NULL;
 104}
 105
 106/* ===================== Expansion card daemon ======================== */
 107/*
 108 * Since the loader programs on the expansion cards need to be run
 109 * in a specific environment, create a separate task with this
 110 * environment up, and pass requests to this task as and when we
 111 * need to.
 112 *
 113 * This should allow 99% of loaders to be called from Linux.
 114 *
 115 * From a security standpoint, we trust the card vendors.  This
 116 * may be a misplaced trust.
 117 */
 118static void ecard_task_reset(struct ecard_request *req)
 119{
 120	struct expansion_card *ec = req->ec;
 121	struct resource *res;
 122
 123	res = ec->slot_no == 8
 124		? &ec->resource[ECARD_RES_MEMC]
 125		: ec->easi
 126		  ? &ec->resource[ECARD_RES_EASI]
 127		  : &ec->resource[ECARD_RES_IOCSYNC];
 128
 129	ecard_loader_reset(res->start, ec->loader);
 130}
 131
 132static void ecard_task_readbytes(struct ecard_request *req)
 133{
 134	struct expansion_card *ec = req->ec;
 135	unsigned char *buf = req->buffer;
 136	unsigned int len = req->length;
 137	unsigned int off = req->address;
 138
 139	if (ec->slot_no == 8) {
 140		void __iomem *base = (void __iomem *)
 141				ec->resource[ECARD_RES_MEMC].start;
 142
 143		/*
 144		 * The card maintains an index which increments the address
 145		 * into a 4096-byte page on each access.  We need to keep
 146		 * track of the counter.
 147		 */
 148		static unsigned int index;
 149		unsigned int page;
 150
 151		page = (off >> 12) * 4;
 152		if (page > 256 * 4)
 153			return;
 154
 155		off &= 4095;
 156
 157		/*
 158		 * If we are reading offset 0, or our current index is
 159		 * greater than the offset, reset the hardware index counter.
 160		 */
 161		if (off == 0 || index > off) {
 162			writeb(0, base);
 163			index = 0;
 164		}
 165
 166		/*
 167		 * Increment the hardware index counter until we get to the
 168		 * required offset.  The read bytes are discarded.
 169		 */
 170		while (index < off) {
 171			readb(base + page);
 172			index += 1;
 173		}
 174
 175		while (len--) {
 176			*buf++ = readb(base + page);
 177			index += 1;
 178		}
 179	} else {
 180		unsigned long base = (ec->easi
 181			 ? &ec->resource[ECARD_RES_EASI]
 182			 : &ec->resource[ECARD_RES_IOCSYNC])->start;
 183		void __iomem *pbase = (void __iomem *)base;
 184
 185		if (!req->use_loader || !ec->loader) {
 186			off *= 4;
 187			while (len--) {
 188				*buf++ = readb(pbase + off);
 189				off += 4;
 190			}
 191		} else {
 192			while(len--) {
 193				/*
 194				 * The following is required by some
 195				 * expansion card loader programs.
 196				 */
 197				*(unsigned long *)0x108 = 0;
 198				*buf++ = ecard_loader_read(off++, base,
 199							   ec->loader);
 200			}
 201		}
 202	}
 203
 204}
 205
 206static DECLARE_WAIT_QUEUE_HEAD(ecard_wait);
 207static struct ecard_request *ecard_req;
 208static DEFINE_MUTEX(ecard_mutex);
 209
 210/*
 211 * Set up the expansion card daemon's page tables.
 212 */
 213static void ecard_init_pgtables(struct mm_struct *mm)
 214{
 215	struct vm_area_struct vma;
 216
 217	/* We want to set up the page tables for the following mapping:
 218	 *  Virtual	Physical
 219	 *  0x03000000	0x03000000
 220	 *  0x03010000	unmapped
 221	 *  0x03210000	0x03210000
 222	 *  0x03400000	unmapped
 223	 *  0x08000000	0x08000000
 224	 *  0x10000000	unmapped
 225	 *
 226	 * FIXME: we don't follow this 100% yet.
 227	 */
 228	pgd_t *src_pgd, *dst_pgd;
 229
 230	src_pgd = pgd_offset(mm, (unsigned long)IO_BASE);
 231	dst_pgd = pgd_offset(mm, IO_START);
 232
 233	memcpy(dst_pgd, src_pgd, sizeof(pgd_t) * (IO_SIZE / PGDIR_SIZE));
 234
 235	src_pgd = pgd_offset(mm, (unsigned long)EASI_BASE);
 236	dst_pgd = pgd_offset(mm, EASI_START);
 237
 238	memcpy(dst_pgd, src_pgd, sizeof(pgd_t) * (EASI_SIZE / PGDIR_SIZE));
 239
 240	vma.vm_flags = VM_EXEC;
 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	/*
 267	 * Allocate a mm.  We're not a lazy-TLB kernel task since we need
 268	 * to set page table entries where the user space would be.  Note
 269	 * that this also creates the page tables.  Failure is not an
 270	 * option here.
 271	 */
 272	if (ecard_init_mm())
 273		panic("kecardd: unable to alloc mm\n");
 274
 275	while (1) {
 276		struct ecard_request *req;
 277
 278		wait_event_interruptible(ecard_wait, ecard_req != NULL);
 279
 280		req = xchg(&ecard_req, NULL);
 281		if (req != NULL) {
 282			req->fn(req);
 283			complete(req->complete);
 284		}
 285	}
 286}
 287
 288/*
 289 * Wake the expansion card daemon to action our request.
 290 *
 291 * FIXME: The test here is not sufficient to detect if the
 292 * kcardd is running.
 293 */
 294static void ecard_call(struct ecard_request *req)
 295{
 296	DECLARE_COMPLETION_ONSTACK(completion);
 297
 298	req->complete = &completion;
 299
 300	mutex_lock(&ecard_mutex);
 301	ecard_req = req;
 302	wake_up(&ecard_wait);
 303
 304	/*
 305	 * Now wait for kecardd to run.
 306	 */
 307	wait_for_completion(&completion);
 308	mutex_unlock(&ecard_mutex);
 309}
 310
 311/* ======================= Mid-level card control ===================== */
 312
 313static void
 314ecard_readbytes(void *addr, ecard_t *ec, int off, int len, int useld)
 315{
 316	struct ecard_request req;
 317
 318	req.fn		= ecard_task_readbytes;
 319	req.ec		= ec;
 320	req.address	= off;
 321	req.length	= len;
 322	req.use_loader	= useld;
 323	req.buffer	= addr;
 324
 325	ecard_call(&req);
 326}
 327
 328int ecard_readchunk(struct in_chunk_dir *cd, ecard_t *ec, int id, int num)
 329{
 330	struct ex_chunk_dir excd;
 331	int index = 16;
 332	int useld = 0;
 333
 334	if (!ec->cid.cd)
 335		return 0;
 336
 337	while(1) {
 338		ecard_readbytes(&excd, ec, index, 8, useld);
 339		index += 8;
 340		if (c_id(&excd) == 0) {
 341			if (!useld && ec->loader) {
 342				useld = 1;
 343				index = 0;
 344				continue;
 345			}
 346			return 0;
 347		}
 348		if (c_id(&excd) == 0xf0) { /* link */
 349			index = c_start(&excd);
 350			continue;
 351		}
 352		if (c_id(&excd) == 0x80) { /* loader */
 353			if (!ec->loader) {
 354				ec->loader = kmalloc(c_len(&excd),
 355							       GFP_KERNEL);
 356				if (ec->loader)
 357					ecard_readbytes(ec->loader, ec,
 358							(int)c_start(&excd),
 359							c_len(&excd), useld);
 360				else
 361					return 0;
 362			}
 363			continue;
 364		}
 365		if (c_id(&excd) == id && num-- == 0)
 366			break;
 367	}
 368
 369	if (c_id(&excd) & 0x80) {
 370		switch (c_id(&excd) & 0x70) {
 371		case 0x70:
 372			ecard_readbytes((unsigned char *)excd.d.string, ec,
 373					(int)c_start(&excd), c_len(&excd),
 374					useld);
 375			break;
 376		case 0x00:
 377			break;
 378		}
 379	}
 380	cd->start_offset = c_start(&excd);
 381	memcpy(cd->d.string, excd.d.string, 256);
 382	return 1;
 383}
 384
 385/* ======================= Interrupt control ============================ */
 386
 387static void ecard_def_irq_enable(ecard_t *ec, int irqnr)
 388{
 389}
 390
 391static void ecard_def_irq_disable(ecard_t *ec, int irqnr)
 392{
 393}
 394
 395static int ecard_def_irq_pending(ecard_t *ec)
 396{
 397	return !ec->irqmask || readb(ec->irqaddr) & ec->irqmask;
 398}
 399
 400static void ecard_def_fiq_enable(ecard_t *ec, int fiqnr)
 401{
 402	panic("ecard_def_fiq_enable called - impossible");
 403}
 404
 405static void ecard_def_fiq_disable(ecard_t *ec, int fiqnr)
 406{
 407	panic("ecard_def_fiq_disable called - impossible");
 408}
 409
 410static int ecard_def_fiq_pending(ecard_t *ec)
 411{
 412	return !ec->fiqmask || readb(ec->fiqaddr) & ec->fiqmask;
 413}
 414
 415static expansioncard_ops_t ecard_default_ops = {
 416	ecard_def_irq_enable,
 417	ecard_def_irq_disable,
 418	ecard_def_irq_pending,
 419	ecard_def_fiq_enable,
 420	ecard_def_fiq_disable,
 421	ecard_def_fiq_pending
 422};
 423
 424/*
 425 * Enable and disable interrupts from expansion cards.
 426 * (interrupts are disabled for these functions).
 427 *
 428 * They are not meant to be called directly, but via enable/disable_irq.
 429 */
 430static void ecard_irq_unmask(struct irq_data *d)
 431{
 432	ecard_t *ec = irq_data_get_irq_chip_data(d);
 433
 434	if (ec) {
 435		if (!ec->ops)
 436			ec->ops = &ecard_default_ops;
 437
 438		if (ec->claimed && ec->ops->irqenable)
 439			ec->ops->irqenable(ec, d->irq);
 440		else
 441			printk(KERN_ERR "ecard: rejecting request to "
 442				"enable IRQs for %d\n", d->irq);
 443	}
 444}
 445
 446static void ecard_irq_mask(struct irq_data *d)
 447{
 448	ecard_t *ec = irq_data_get_irq_chip_data(d);
 449
 450	if (ec) {
 451		if (!ec->ops)
 452			ec->ops = &ecard_default_ops;
 453
 454		if (ec->ops && ec->ops->irqdisable)
 455			ec->ops->irqdisable(ec, d->irq);
 456	}
 457}
 458
 459static struct irq_chip ecard_chip = {
 460	.name		= "ECARD",
 461	.irq_ack	= ecard_irq_mask,
 462	.irq_mask	= ecard_irq_mask,
 463	.irq_unmask	= ecard_irq_unmask,
 464};
 465
 466void ecard_enablefiq(unsigned int fiqnr)
 467{
 468	ecard_t *ec = slot_to_ecard(fiqnr);
 469
 470	if (ec) {
 471		if (!ec->ops)
 472			ec->ops = &ecard_default_ops;
 473
 474		if (ec->claimed && ec->ops->fiqenable)
 475			ec->ops->fiqenable(ec, fiqnr);
 476		else
 477			printk(KERN_ERR "ecard: rejecting request to "
 478				"enable FIQs for %d\n", fiqnr);
 479	}
 480}
 481
 482void ecard_disablefiq(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->ops->fiqdisable)
 491			ec->ops->fiqdisable(ec, fiqnr);
 492	}
 493}
 494
 495static void ecard_dump_irq_state(void)
 496{
 497	ecard_t *ec;
 498
 499	printk("Expansion card IRQ state:\n");
 500
 501	for (ec = cards; ec; ec = ec->next) {
 502		if (ec->slot_no == 8)
 503			continue;
 504
 505		printk("  %d: %sclaimed, ",
 506		       ec->slot_no, ec->claimed ? "" : "not ");
 507
 508		if (ec->ops && ec->ops->irqpending &&
 509		    ec->ops != &ecard_default_ops)
 510			printk("irq %spending\n",
 511			       ec->ops->irqpending(ec) ? "" : "not ");
 512		else
 513			printk("irqaddr %p, mask = %02X, status = %02X\n",
 514			       ec->irqaddr, ec->irqmask, readb(ec->irqaddr));
 515	}
 516}
 517
 518static void ecard_check_lockup(struct irq_desc *desc)
 519{
 520	static unsigned long last;
 521	static int lockup;
 522
 523	/*
 524	 * If the timer interrupt has not run since the last million
 525	 * unrecognised expansion card interrupts, then there is
 526	 * something seriously wrong.  Disable the expansion card
 527	 * interrupts so at least we can continue.
 528	 *
 529	 * Maybe we ought to start a timer to re-enable them some time
 530	 * later?
 531	 */
 532	if (last == jiffies) {
 533		lockup += 1;
 534		if (lockup > 1000000) {
 535			printk(KERN_ERR "\nInterrupt lockup detected - "
 536			       "disabling all expansion card interrupts\n");
 537
 538			desc->irq_data.chip->irq_mask(&desc->irq_data);
 539			ecard_dump_irq_state();
 540		}
 541	} else
 542		lockup = 0;
 543
 544	/*
 545	 * If we did not recognise the source of this interrupt,
 546	 * warn the user, but don't flood the user with these messages.
 547	 */
 548	if (!last || time_after(jiffies, last + 5*HZ)) {
 549		last = jiffies;
 550		printk(KERN_WARNING "Unrecognised interrupt from backplane\n");
 551		ecard_dump_irq_state();
 552	}
 553}
 554
 555static void ecard_irq_handler(struct irq_desc *desc)
 556{
 557	ecard_t *ec;
 558	int called = 0;
 559
 560	desc->irq_data.chip->irq_mask(&desc->irq_data);
 561	for (ec = cards; ec; ec = ec->next) {
 562		int pending;
 563
 564		if (!ec->claimed || !ec->irq || ec->slot_no == 8)
 565			continue;
 566
 567		if (ec->ops && ec->ops->irqpending)
 568			pending = ec->ops->irqpending(ec);
 569		else
 570			pending = ecard_default_ops.irqpending(ec);
 571
 572		if (pending) {
 573			generic_handle_irq(ec->irq);
 574			called ++;
 575		}
 576	}
 577	desc->irq_data.chip->irq_unmask(&desc->irq_data);
 578
 579	if (called == 0)
 580		ecard_check_lockup(desc);
 581}
 582
 583static void __iomem *__ecard_address(ecard_t *ec, card_type_t type, card_speed_t speed)
 584{
 585	void __iomem *address = NULL;
 586	int slot = ec->slot_no;
 587
 588	if (ec->slot_no == 8)
 589		return ECARD_MEMC8_BASE;
 590
 591	ectcr &= ~(1 << slot);
 592
 593	switch (type) {
 594	case ECARD_MEMC:
 595		if (slot < 4)
 596			address = ECARD_MEMC_BASE + (slot << 14);
 597		break;
 598
 599	case ECARD_IOC:
 600		if (slot < 4)
 601			address = ECARD_IOC_BASE + (slot << 14);
 602		else
 603			address = ECARD_IOC4_BASE + ((slot - 4) << 14);
 604		if (address)
 605			address += speed << 19;
 606		break;
 607
 608	case ECARD_EASI:
 609		address = ECARD_EASI_BASE + (slot << 24);
 610		if (speed == ECARD_FAST)
 611			ectcr |= 1 << slot;
 612		break;
 613
 614	default:
 615		break;
 616	}
 617
 618#ifdef IOMD_ECTCR
 619	iomd_writeb(ectcr, IOMD_ECTCR);
 620#endif
 621	return address;
 622}
 623
 624static int ecard_prints(struct seq_file *m, ecard_t *ec)
 625{
 626	seq_printf(m, "  %d: %s ", ec->slot_no, ec->easi ? "EASI" : "    ");
 627
 628	if (ec->cid.id == 0) {
 629		struct in_chunk_dir incd;
 630
 631		seq_printf(m, "[%04X:%04X] ",
 632			ec->cid.manufacturer, ec->cid.product);
 633
 634		if (!ec->card_desc && ec->cid.cd &&
 635		    ecard_readchunk(&incd, ec, 0xf5, 0)) {
 636			ec->card_desc = kmalloc(strlen(incd.d.string)+1, GFP_KERNEL);
 637
 638			if (ec->card_desc)
 639				strcpy((char *)ec->card_desc, incd.d.string);
 640		}
 641
 642		seq_printf(m, "%s\n", ec->card_desc ? ec->card_desc : "*unknown*");
 643	} else
 644		seq_printf(m, "Simple card %d\n", ec->cid.id);
 645
 646	return 0;
 647}
 648
 649static int ecard_devices_proc_show(struct seq_file *m, void *v)
 650{
 651	ecard_t *ec = cards;
 652
 653	while (ec) {
 654		ecard_prints(m, ec);
 655		ec = ec->next;
 656	}
 657	return 0;
 658}
 659
 660static int ecard_devices_proc_open(struct inode *inode, struct file *file)
 661{
 662	return single_open(file, ecard_devices_proc_show, NULL);
 663}
 664
 665static const struct file_operations bus_ecard_proc_fops = {
 666	.owner		= THIS_MODULE,
 667	.open		= ecard_devices_proc_open,
 668	.read		= seq_read,
 669	.llseek		= seq_lseek,
 670	.release	= single_release,
 671};
 672
 673static struct proc_dir_entry *proc_bus_ecard_dir = NULL;
 674
 675static void ecard_proc_init(void)
 676{
 677	proc_bus_ecard_dir = proc_mkdir("bus/ecard", NULL);
 678	proc_create("devices", 0, proc_bus_ecard_dir, &bus_ecard_proc_fops);
 679}
 680
 681#define ec_set_resource(ec,nr,st,sz)				\
 682	do {							\
 683		(ec)->resource[nr].name = dev_name(&ec->dev);	\
 684		(ec)->resource[nr].start = st;			\
 685		(ec)->resource[nr].end = (st) + (sz) - 1;	\
 686		(ec)->resource[nr].flags = IORESOURCE_MEM;	\
 687	} while (0)
 688
 689static void __init ecard_free_card(struct expansion_card *ec)
 690{
 691	int i;
 692
 693	for (i = 0; i < ECARD_NUM_RESOURCES; i++)
 694		if (ec->resource[i].flags)
 695			release_resource(&ec->resource[i]);
 696
 697	kfree(ec);
 698}
 699
 700static struct expansion_card *__init ecard_alloc_card(int type, int slot)
 701{
 702	struct expansion_card *ec;
 703	unsigned long base;
 704	int i;
 705
 706	ec = kzalloc(sizeof(ecard_t), GFP_KERNEL);
 707	if (!ec) {
 708		ec = ERR_PTR(-ENOMEM);
 709		goto nomem;
 710	}
 711
 712	ec->slot_no = slot;
 713	ec->easi = type == ECARD_EASI;
 714	ec->irq = 0;
 715	ec->fiq = 0;
 716	ec->dma = NO_DMA;
 717	ec->ops = &ecard_default_ops;
 718
 719	dev_set_name(&ec->dev, "ecard%d", slot);
 720	ec->dev.parent = NULL;
 721	ec->dev.bus = &ecard_bus_type;
 722	ec->dev.dma_mask = &ec->dma_mask;
 723	ec->dma_mask = (u64)0xffffffff;
 724	ec->dev.coherent_dma_mask = ec->dma_mask;
 725
 726	if (slot < 4) {
 727		ec_set_resource(ec, ECARD_RES_MEMC,
 728				PODSLOT_MEMC_BASE + (slot << 14),
 729				PODSLOT_MEMC_SIZE);
 730		base = PODSLOT_IOC0_BASE + (slot << 14);
 731	} else
 732		base = PODSLOT_IOC4_BASE + ((slot - 4) << 14);
 733
 734#ifdef CONFIG_ARCH_RPC
 735	if (slot < 8) {
 736		ec_set_resource(ec, ECARD_RES_EASI,
 737				PODSLOT_EASI_BASE + (slot << 24),
 738				PODSLOT_EASI_SIZE);
 739	}
 740
 741	if (slot == 8) {
 742		ec_set_resource(ec, ECARD_RES_MEMC, NETSLOT_BASE, NETSLOT_SIZE);
 743	} else
 744#endif
 745
 746	for (i = 0; i <= ECARD_RES_IOCSYNC - ECARD_RES_IOCSLOW; i++)
 747		ec_set_resource(ec, i + ECARD_RES_IOCSLOW,
 748				base + (i << 19), PODSLOT_IOC_SIZE);
 749
 750	for (i = 0; i < ECARD_NUM_RESOURCES; i++) {
 751		if (ec->resource[i].flags &&
 752		    request_resource(&iomem_resource, &ec->resource[i])) {
 753			dev_err(&ec->dev, "resource(s) not available\n");
 754			ec->resource[i].end -= ec->resource[i].start;
 755			ec->resource[i].start = 0;
 756			ec->resource[i].flags = 0;
 757		}
 758	}
 759
 760 nomem:
 761	return ec;
 762}
 763
 764static ssize_t irq_show(struct device *dev, struct device_attribute *attr, char *buf)
 765{
 766	struct expansion_card *ec = ECARD_DEV(dev);
 767	return sprintf(buf, "%u\n", ec->irq);
 768}
 769static DEVICE_ATTR_RO(irq);
 770
 771static ssize_t dma_show(struct device *dev, struct device_attribute *attr, char *buf)
 772{
 773	struct expansion_card *ec = ECARD_DEV(dev);
 774	return sprintf(buf, "%u\n", ec->dma);
 775}
 776static DEVICE_ATTR_RO(dma);
 777
 778static ssize_t resource_show(struct device *dev, struct device_attribute *attr, char *buf)
 779{
 780	struct expansion_card *ec = ECARD_DEV(dev);
 781	char *str = buf;
 782	int i;
 783
 784	for (i = 0; i < ECARD_NUM_RESOURCES; i++)
 785		str += sprintf(str, "%08x %08x %08lx\n",
 786				ec->resource[i].start,
 787				ec->resource[i].end,
 788				ec->resource[i].flags);
 789
 790	return str - buf;
 791}
 792static DEVICE_ATTR_RO(resource);
 793
 794static ssize_t vendor_show(struct device *dev, struct device_attribute *attr, char *buf)
 795{
 796	struct expansion_card *ec = ECARD_DEV(dev);
 797	return sprintf(buf, "%u\n", ec->cid.manufacturer);
 798}
 799static DEVICE_ATTR_RO(vendor);
 800
 801static ssize_t device_show(struct device *dev, struct device_attribute *attr, char *buf)
 802{
 803	struct expansion_card *ec = ECARD_DEV(dev);
 804	return sprintf(buf, "%u\n", ec->cid.product);
 805}
 806static DEVICE_ATTR_RO(device);
 807
 808static ssize_t type_show(struct device *dev, struct device_attribute *attr, char *buf)
 809{
 810	struct expansion_card *ec = ECARD_DEV(dev);
 811	return sprintf(buf, "%s\n", ec->easi ? "EASI" : "IOC");
 812}
 813static DEVICE_ATTR_RO(type);
 814
 815static struct attribute *ecard_dev_attrs[] = {
 816	&dev_attr_device.attr,
 817	&dev_attr_dma.attr,
 818	&dev_attr_irq.attr,
 819	&dev_attr_resource.attr,
 820	&dev_attr_type.attr,
 821	&dev_attr_vendor.attr,
 822	NULL,
 823};
 824ATTRIBUTE_GROUPS(ecard_dev);
 825
 826int ecard_request_resources(struct expansion_card *ec)
 827{
 828	int i, err = 0;
 829
 830	for (i = 0; i < ECARD_NUM_RESOURCES; i++) {
 831		if (ecard_resource_end(ec, i) &&
 832		    !request_mem_region(ecard_resource_start(ec, i),
 833					ecard_resource_len(ec, i),
 834					ec->dev.driver->name)) {
 835			err = -EBUSY;
 836			break;
 837		}
 838	}
 839
 840	if (err) {
 841		while (i--)
 842			if (ecard_resource_end(ec, i))
 843				release_mem_region(ecard_resource_start(ec, i),
 844						   ecard_resource_len(ec, i));
 845	}
 846	return err;
 847}
 848EXPORT_SYMBOL(ecard_request_resources);
 849
 850void ecard_release_resources(struct expansion_card *ec)
 851{
 852	int i;
 853
 854	for (i = 0; i < ECARD_NUM_RESOURCES; i++)
 855		if (ecard_resource_end(ec, i))
 856			release_mem_region(ecard_resource_start(ec, i),
 857					   ecard_resource_len(ec, i));
 858}
 859EXPORT_SYMBOL(ecard_release_resources);
 860
 861void ecard_setirq(struct expansion_card *ec, const struct expansion_card_ops *ops, void *irq_data)
 862{
 863	ec->irq_data = irq_data;
 864	barrier();
 865	ec->ops = ops;
 866}
 867EXPORT_SYMBOL(ecard_setirq);
 868
 869void __iomem *ecardm_iomap(struct expansion_card *ec, unsigned int res,
 870			   unsigned long offset, unsigned long maxsize)
 871{
 872	unsigned long start = ecard_resource_start(ec, res);
 873	unsigned long end = ecard_resource_end(ec, res);
 874
 875	if (offset > (end - start))
 876		return NULL;
 877
 878	start += offset;
 879	if (maxsize && end - start > maxsize)
 880		end = start + maxsize;
 881	
 882	return devm_ioremap(&ec->dev, start, end - start);
 883}
 884EXPORT_SYMBOL(ecardm_iomap);
 885
 886/*
 887 * Probe for an expansion card.
 888 *
 889 * If bit 1 of the first byte of the card is set, then the
 890 * card does not exist.
 891 */
 892static int __init ecard_probe(int slot, unsigned irq, card_type_t type)
 893{
 894	ecard_t **ecp;
 895	ecard_t *ec;
 896	struct ex_ecid cid;
 897	void __iomem *addr;
 898	int i, rc;
 899
 900	ec = ecard_alloc_card(type, slot);
 901	if (IS_ERR(ec)) {
 902		rc = PTR_ERR(ec);
 903		goto nomem;
 904	}
 905
 906	rc = -ENODEV;
 907	if ((addr = __ecard_address(ec, type, ECARD_SYNC)) == NULL)
 908		goto nodev;
 909
 910	cid.r_zero = 1;
 911	ecard_readbytes(&cid, ec, 0, 16, 0);
 912	if (cid.r_zero)
 913		goto nodev;
 914
 915	ec->cid.id	= cid.r_id;
 916	ec->cid.cd	= cid.r_cd;
 917	ec->cid.is	= cid.r_is;
 918	ec->cid.w	= cid.r_w;
 919	ec->cid.manufacturer = ecard_getu16(cid.r_manu);
 920	ec->cid.product = ecard_getu16(cid.r_prod);
 921	ec->cid.country = cid.r_country;
 922	ec->cid.irqmask = cid.r_irqmask;
 923	ec->cid.irqoff  = ecard_gets24(cid.r_irqoff);
 924	ec->cid.fiqmask = cid.r_fiqmask;
 925	ec->cid.fiqoff  = ecard_gets24(cid.r_fiqoff);
 926	ec->fiqaddr	=
 927	ec->irqaddr	= addr;
 928
 929	if (ec->cid.is) {
 930		ec->irqmask = ec->cid.irqmask;
 931		ec->irqaddr += ec->cid.irqoff;
 932		ec->fiqmask = ec->cid.fiqmask;
 933		ec->fiqaddr += ec->cid.fiqoff;
 934	} else {
 935		ec->irqmask = 1;
 936		ec->fiqmask = 4;
 937	}
 938
 939	for (i = 0; i < ARRAY_SIZE(blacklist); i++)
 940		if (blacklist[i].manufacturer == ec->cid.manufacturer &&
 941		    blacklist[i].product == ec->cid.product) {
 942			ec->card_desc = blacklist[i].type;
 943			break;
 944		}
 945
 946	ec->irq = irq;
 947
 948	/*
 949	 * hook the interrupt handlers
 950	 */
 951	if (slot < 8) {
 952		irq_set_chip_and_handler(ec->irq, &ecard_chip,
 953					 handle_level_irq);
 954		irq_set_chip_data(ec->irq, ec);
 955		irq_clear_status_flags(ec->irq, IRQ_NOREQUEST);
 956	}
 957
 958#ifdef CONFIG_ARCH_RPC
 959	/* On RiscPC, only first two slots have DMA capability */
 960	if (slot < 2)
 961		ec->dma = 2 + slot;
 962#endif
 963
 964	for (ecp = &cards; *ecp; ecp = &(*ecp)->next);
 965
 966	*ecp = ec;
 967	slot_to_expcard[slot] = ec;
 968
 969	rc = device_register(&ec->dev);
 970	if (rc)
 971		goto nodev;
 972
 973	return 0;
 974
 975 nodev:
 976	ecard_free_card(ec);
 977 nomem:
 978	return rc;
 979}
 980
 981/*
 982 * Initialise the expansion card system.
 983 * Locate all hardware - interrupt management and
 984 * actual cards.
 985 */
 986static int __init ecard_init(void)
 987{
 988	struct task_struct *task;
 989	int slot, irqbase;
 990
 991	irqbase = irq_alloc_descs(-1, 0, 8, -1);
 992	if (irqbase < 0)
 993		return irqbase;
 994
 995	task = kthread_run(ecard_task, NULL, "kecardd");
 996	if (IS_ERR(task)) {
 997		printk(KERN_ERR "Ecard: unable to create kernel thread: %ld\n",
 998		       PTR_ERR(task));
 999		irq_free_descs(irqbase, 8);
1000		return PTR_ERR(task);
1001	}
1002
1003	printk("Probing expansion cards\n");
1004
1005	for (slot = 0; slot < 8; slot ++) {
1006		if (ecard_probe(slot, irqbase + slot, ECARD_EASI) == -ENODEV)
1007			ecard_probe(slot, irqbase + slot, ECARD_IOC);
1008	}
1009
1010	ecard_probe(8, 11, ECARD_IOC);
1011
1012	irq_set_chained_handler(IRQ_EXPANSIONCARD, ecard_irq_handler);
1013
1014	ecard_proc_init();
1015
1016	return 0;
1017}
1018
1019subsys_initcall(ecard_init);
1020
1021/*
1022 *	ECARD "bus"
1023 */
1024static const struct ecard_id *
1025ecard_match_device(const struct ecard_id *ids, struct expansion_card *ec)
1026{
1027	int i;
1028
1029	for (i = 0; ids[i].manufacturer != 65535; i++)
1030		if (ec->cid.manufacturer == ids[i].manufacturer &&
1031		    ec->cid.product == ids[i].product)
1032			return ids + i;
1033
1034	return NULL;
1035}
1036
1037static int ecard_drv_probe(struct device *dev)
1038{
1039	struct expansion_card *ec = ECARD_DEV(dev);
1040	struct ecard_driver *drv = ECARD_DRV(dev->driver);
1041	const struct ecard_id *id;
1042	int ret;
1043
1044	id = ecard_match_device(drv->id_table, ec);
1045
1046	ec->claimed = 1;
1047	ret = drv->probe(ec, id);
1048	if (ret)
1049		ec->claimed = 0;
1050	return ret;
1051}
1052
1053static int ecard_drv_remove(struct device *dev)
1054{
1055	struct expansion_card *ec = ECARD_DEV(dev);
1056	struct ecard_driver *drv = ECARD_DRV(dev->driver);
1057
1058	drv->remove(ec);
1059	ec->claimed = 0;
1060
1061	/*
1062	 * Restore the default operations.  We ensure that the
1063	 * ops are set before we change the data.
1064	 */
1065	ec->ops = &ecard_default_ops;
1066	barrier();
1067	ec->irq_data = NULL;
1068
1069	return 0;
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 */
1078static 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
1100int ecard_register_driver(struct ecard_driver *drv)
1101{
1102	drv->drv.bus = &ecard_bus_type;
1103
1104	return driver_register(&drv->drv);
1105}
1106
1107void ecard_remove_driver(struct ecard_driver *drv)
1108{
1109	driver_unregister(&drv->drv);
1110}
1111
1112static int ecard_match(struct device *_dev, 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
1127struct 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
1136static int ecard_bus_init(void)
1137{
1138	return bus_register(&ecard_bus_type);
1139}
1140
1141postcore_initcall(ecard_bus_init);
1142
1143EXPORT_SYMBOL(ecard_readchunk);
1144EXPORT_SYMBOL(ecard_register_driver);
1145EXPORT_SYMBOL(ecard_remove_driver);
1146EXPORT_SYMBOL(ecard_bus_type);