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
  56struct 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
  66struct expcard_quirklist {
  67	unsigned short	 manufacturer;
  68	unsigned short	 product;
  69	const char	*type;
  70	void (*init)(ecard_t *ec);
  71};
  72
  73static ecard_t *cards;
  74static ecard_t *slot_to_expcard[MAX_ECARDS];
  75static unsigned int ectcr;
  76
  77static 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 */
  82static 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
  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->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->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 DEFINE_MUTEX(ecard_mutex);
 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 = 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
 245static 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
 261static int
 262ecard_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 */
 292static 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
 311static void
 312ecard_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
 326int 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
 385static void ecard_def_irq_enable(ecard_t *ec, int irqnr)
 386{
 387}
 388
 389static void ecard_def_irq_disable(ecard_t *ec, int irqnr)
 390{
 391}
 392
 393static int ecard_def_irq_pending(ecard_t *ec)
 394{
 395	return !ec->irqmask || readb(ec->irqaddr) & ec->irqmask;
 396}
 397
 398static void ecard_def_fiq_enable(ecard_t *ec, int fiqnr)
 399{
 400	panic("ecard_def_fiq_enable called - impossible");
 401}
 402
 403static void ecard_def_fiq_disable(ecard_t *ec, int fiqnr)
 404{
 405	panic("ecard_def_fiq_disable called - impossible");
 406}
 407
 408static int ecard_def_fiq_pending(ecard_t *ec)
 409{
 410	return !ec->fiqmask || readb(ec->fiqaddr) & ec->fiqmask;
 411}
 412
 413static 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 */
 428static 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
 444static 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
 457static 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
 464void 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
 480void 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
 493static 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
 519static 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
 556static 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
 584static 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
 625static 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
 650static 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
 661static struct proc_dir_entry *proc_bus_ecard_dir = NULL;
 662
 663static 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
 678static 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
 689static 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
 753static 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}
 758static DEVICE_ATTR_RO(irq);
 759
 760static 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}
 765static DEVICE_ATTR_RO(dma);
 766
 767static 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}
 781static DEVICE_ATTR_RO(resource);
 782
 783static 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}
 788static DEVICE_ATTR_RO(vendor);
 789
 790static 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}
 795static DEVICE_ATTR_RO(device);
 796
 797static 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}
 802static DEVICE_ATTR_RO(type);
 803
 804static 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};
 813ATTRIBUTE_GROUPS(ecard_dev);
 814
 815int 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}
 837EXPORT_SYMBOL(ecard_request_resources);
 838
 839void 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}
 848EXPORT_SYMBOL(ecard_release_resources);
 849
 850void 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}
 856EXPORT_SYMBOL(ecard_setirq);
 857
 858void __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}
 873EXPORT_SYMBOL(ecardm_iomap);
 874
 875static 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 */
 891static 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 */
 988static 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
1021subsys_initcall(ecard_init);
1022
1023/*
1024 *	ECARD "bus"
1025 */
1026static const struct ecard_id *
1027ecard_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
1039static 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
1055static 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 */
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, 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
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);