text: /*
   *  linux/arch/arm/kernel/ecard.c
   *
   *  Copyright 1995-1998 Russell King
   *
   * This program is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License version 2 as
   * published by the Free Software Foundation.
   *
   *  Find all installed expansion cards, and handle interrupts from them.
   *
   *  Created from information from Acorns RiscOS3 PRMs
   *
   *  08-Dec-1996	RMK	Added code for the 9'th expansion card - the ether
   *			podule slot.
   *  06-May-1997	RMK	Added blacklist for cards whose loader doesn't work.
   *  12-Sep-1997	RMK	Created new handling of interrupt enables/disables
   *			- cards can now register their own routine to control
   *			interrupts (recommended).
   *  29-Sep-1997	RMK	Expansion card interrupt hardware not being re-enabled
   *			on reset from Linux. (Caused cards not to respond
   *			under RiscOS without hard reset).
   *  15-Feb-1998	RMK	Added DMA support
   *  12-Sep-1998	RMK	Added EASI support
   *  10-Jan-1999	RMK	Run loaders in a simulated RISC OS environment.
   *  17-Apr-1999	RMK	Support for EASI Type C cycles.
   */
  #define ECARD_C
  #define __KERNEL_SYSCALLS__
  
  #include <linux/config.h>
  #include <linux/module.h>
  #include <linux/kernel.h>
  #include <linux/types.h>
  #include <linux/sched.h>
  #include <linux/interrupt.h>
  #include <linux/mm.h>
  #include <linux/malloc.h>
  #include <linux/proc_fs.h>
  #include <linux/init.h>
  
  #include <asm/dma.h>
  #include <asm/ecard.h>
  #include <asm/hardware.h>
  #include <asm/io.h>
  #include <asm/irq.h>
  #include <asm/pgalloc.h>
  #include <asm/mmu_context.h>
  
  #ifndef CONFIG_ARCH_RPC
  #define HAVE_EXPMASK
  #endif
  
  enum req {
  	req_readbytes,
  	req_reset
  };
  
  struct ecard_request {
  	enum req	req;
  	ecard_t		*ec;
  	unsigned int	address;
  	unsigned int	length;
  	unsigned int	use_loader;
  	void		*buffer;
  };
  
  struct expcard_blacklist {
  	unsigned short	 manufacturer;
  	unsigned short	 product;
  	const char	*type;
  };
  
  static ecard_t *cards;
  static ecard_t *slot_to_expcard[MAX_ECARDS];
  static unsigned int ectcr;
  #ifdef HAS_EXPMASK
  static unsigned int have_expmask;
  #endif
  
  /* List of descriptions of cards which don't have an extended
   * identification, or chunk directories containing a description.
   */
  static struct expcard_blacklist __initdata blacklist[] = {
  	{ MANU_ACORN, PROD_ACORN_ETHER1, "Acorn Ether1" }
  };
  
  asmlinkage extern int
  ecard_loader_reset(volatile unsigned char *pa, loader_t loader);
  asmlinkage extern int
  ecard_loader_read(int off, volatile unsigned char *pa, loader_t loader);
  extern int setup_arm_irq(int, struct irqaction *);
  extern void do_ecard_IRQ(int, struct pt_regs *);
  
  
  static void
  ecard_irq_noexpmask(int intr_no, void *dev_id, struct pt_regs *regs);
  
  static struct irqaction irqexpansioncard = {
  	ecard_irq_noexpmask, SA_INTERRUPT, 0, "expansion cards", NULL, NULL
  };
  
  static inline unsigned short
  ecard_getu16(unsigned char *v)
  {
  	return v[0] | v[1] << 8;
  }
  
  static inline signed long
  ecard_gets24(unsigned char *v)
  {
  	return v[0] | v[1] << 8 | v[2] << 16 | ((v[2] & 0x80) ? 0xff000000 : 0);
  }
  
  static inline ecard_t *
  slot_to_ecard(unsigned int slot)
  {
  	return slot < MAX_ECARDS ? slot_to_expcard[slot] : NULL;
  }
  
  /* ===================== Expansion card daemon ======================== */
  /*
   * Since the loader programs on the expansion cards need to be run
   * in a specific environment, create a separate task with this
   * environment up, and pass requests to this task as and when we
   * need to.
   *
   * This should allow 99% of loaders to be called from Linux.
   *
   * From a security standpoint, we trust the card vendors.  This
   * may be a misplaced trust.
   */
  #define BUS_ADDR(x) ((((unsigned long)(x)) << 2) + IO_BASE)
  #define POD_INT_ADDR(x)	((volatile unsigned char *)\
  			 ((BUS_ADDR((x)) - IO_BASE) + IO_START))
  
  static void
  ecard_task_reset(struct ecard_request *req)
  {
  	if (req->ec == NULL) {
  		ecard_t *ec;
  
  		for (ec = cards; ec; ec = ec->next)
  			if (ec->loader)
  				ecard_loader_reset(POD_INT_ADDR(ec->podaddr),
  						   ec->loader);
  	} else if (req->ec->loader)
  		ecard_loader_reset(POD_INT_ADDR(req->ec->podaddr),
  				   req->ec->loader);
  }
  
  static void
  ecard_task_readbytes(struct ecard_request *req)
  {
  	unsigned char *buf = (unsigned char *)req->buffer;
  	volatile unsigned char *base_addr =
  		(volatile unsigned char *)POD_INT_ADDR(req->ec->podaddr);
  	unsigned int len = req->length;
  
  	if (req->ec->slot_no == 8) {
  		/*
  		 * The card maintains an index which
  		 * increments the address into a 4096-byte
  		 * page on each access.  We need to keep
  		 * track of the counter.
  		 */
  		static unsigned int index;
  		unsigned int offset, page;
  		unsigned char byte = 0; /* keep gcc quiet */
  
  		offset = req->address & 4095;
  		page   = req->address >> 12;
  
  		if (page > 256)
  			return;
  
  		page *= 4;
  
  		if (offset == 0 || index > offset) {
  			/*
  			 * We need to reset the index counter.
  			 */
  			*base_addr = 0;
  			index = 0;
  		}
  
  		while (index <= offset) {
  			byte = base_addr[page];
  			index += 1;
  		}
  
  		while (len--) {
  			*buf++ = byte;
  			if (len) {
  				byte = base_addr[page];
  				index += 1;
  			}
  		}
  	} else {
  		unsigned int off = req->address;
  
  		if (!req->use_loader || !req->ec->loader) {
  			off *= 4;
  			while (len--) {
  				*buf++ = base_addr[off];
  				off += 4;
  			}
  		} else {
  			while(len--) {
  				/*
  				 * The following is required by some
  				 * expansion card loader programs.
  				 */
  				*(unsigned long *)0x108 = 0;
  				*buf++ = ecard_loader_read(off++, base_addr,
  							   req->ec->loader);
  			}
  		}
  	}
  
  }
  
  #ifdef CONFIG_CPU_32
  static pid_t ecard_pid;
  static wait_queue_head_t ecard_wait;
  static wait_queue_head_t ecard_done;
  static struct ecard_request *ecard_req;
  
  /* to be removed when exec_mmap becomes extern */
  static int exec_mmap(void)
  {
  	struct mm_struct * mm, * old_mm;
  
  	old_mm = current->mm;
  	if (old_mm && atomic_read(&old_mm->mm_users) == 1) {
  		flush_cache_mm(old_mm);
  		mm_release();
  		exit_mmap(old_mm);
  		flush_tlb_mm(old_mm);
  		return 0;
  	}
  
  	mm = mm_alloc();
  	if (mm) {
  		struct mm_struct *active_mm = current->active_mm;
  
  		current->mm = mm;
  		current->active_mm = mm;
  		activate_mm(active_mm, mm);
  		mm_release();
  		if (old_mm) {
  			if (active_mm != old_mm) BUG();
  			mmput(old_mm);
  			return 0;
  		}
  		mmdrop(active_mm);
  		return 0;
  	}
  	return -ENOMEM;
  }
  
  /*
   * Set up the expansion card
   * daemon's environment.
   */
  static void ecard_init_task(int force)
  {
  	/* We want to set up the page tables for the following mapping:
  	 *  Virtual	Physical
  	 *  0x03000000	0x03000000
  	 *  0x03010000	unmapped
  	 *  0x03210000	0x03210000
  	 *  0x03400000	unmapped
  	 *  0x08000000	0x08000000
  	 *  0x10000000	unmapped
  	 *
  	 * FIXME: we don't follow this 100% yet.
  	 */
  	pgd_t *src_pgd, *dst_pgd;
  	unsigned int dst_addr = IO_START;
  
  	if (!force)
  		exec_mmap();
  
  	src_pgd = pgd_offset(current->mm, IO_BASE);
  	dst_pgd = pgd_offset(current->mm, dst_addr);
  
  	while (dst_addr < IO_START + IO_SIZE) {
  		*dst_pgd++ = *src_pgd++;
  		dst_addr += PGDIR_SIZE;
  	}
  
  	flush_tlb_range(current->mm, IO_START, IO_START + IO_SIZE);
  
  	dst_addr = EASI_START;
  	src_pgd = pgd_offset(current->mm, EASI_BASE);
  	dst_pgd = pgd_offset(current->mm, dst_addr);
  
  	while (dst_addr < EASI_START + EASI_SIZE) {
  		*dst_pgd++ = *src_pgd++;
  		dst_addr += PGDIR_SIZE;
  	}
  
  	flush_tlb_range(current->mm, EASI_START, EASI_START + EASI_SIZE);
  }
  
  static int
  ecard_task(void * unused)
  {
  	struct task_struct *tsk = current;
  
  	tsk->session = 1;
  	tsk->pgrp = 1;
  
  	/*
  	 * We don't want /any/ signals, not even SIGKILL
  	 */
  	sigfillset(&tsk->blocked);
  	sigemptyset(&tsk->pending.signal);
  	recalc_sigpending(tsk);
  
  	strcpy(tsk->comm, "kecardd");
  
  	/*
  	 * Set up the environment
  	 */
  	ecard_init_task(0);
  
  	while (1) {
  		struct ecard_request *req;
  
  		do {
  			req = xchg(&ecard_req, NULL);
  
  			if (req == NULL) {
  				sigemptyset(&tsk->pending.signal);
  				interruptible_sleep_on(&ecard_wait);
  			}
  		} while (req == NULL);
  
  		switch (req->req) {
  		case req_readbytes:
  			ecard_task_readbytes(req);
  			break;
  
  		case req_reset:
  			ecard_task_reset(req);
  			break;
  		}
  		wake_up(&ecard_done);
  	}
  }
  
  /*
   * Wake the expansion card daemon to action our request.
   *
   * FIXME: The test here is not sufficient to detect if the
   * kcardd is running.
   */
  static inline void
  ecard_call(struct ecard_request *req)
  {
  	/*
  	 * If we're called from task 0, or from an
  	 * interrupt (will be keyboard interrupt),
  	 * we forcefully set up the memory map, and
  	 * call the loader.  We can't schedule, or
  	 * sleep for this call.
  	 */
  	if ((current == &init_task || in_interrupt()) &&
  	    req->req == req_reset && req->ec == NULL) {
  		ecard_init_task(1);
  		ecard_task_reset(req);
  	} else {
  		if (ecard_pid <= 0)
  			ecard_pid = kernel_thread(ecard_task, NULL,
  					CLONE_FS | CLONE_FILES | CLONE_SIGHAND);
  
  		ecard_req = req;
  
  		wake_up(&ecard_wait);
  
  		sleep_on(&ecard_done);
  	}
  }
  #else
  /*
   * On 26-bit processors, we don't need the kcardd thread to access the
   * expansion card loaders.  We do it directly.
   */
  static inline void
  ecard_call(struct ecard_request *req)
  {
  	if (req->req == req_reset)
  		ecard_task_reset(req);
  	else
  		ecard_task_readbytes(req);
  }
  #endif
  
  /* ======================= Mid-level card control ===================== */
  /*
   * This is called to reset the loaders for each expansion card on reboot.
   *
   * This is required to make sure that the card is in the correct state
   * that RiscOS expects it to be.
   */
  void
  ecard_reset(int slot)
  {
  	struct ecard_request req;
  
  	req.req = req_reset;
  
  	if (slot < 0)
  		req.ec = NULL;
  	else
  		req.ec = slot_to_ecard(slot);
  
  	ecard_call(&req);
  
  #ifdef HAS_EXPMASK
  	if (have_expmask && slot < 0) {
  		have_expmask |= ~0;
  		EXPMASK_ENABLE = have_expmask;
  	}
  #endif
  }
  
  static void
  ecard_readbytes(void *addr, ecard_t *ec, int off, int len, int useld)
  {
  	struct ecard_request req;
  
  	req.req		= req_readbytes;
  	req.ec		= ec;
  	req.address	= off;
  	req.length	= len;
  	req.use_loader	= useld;
  	req.buffer	= addr;
  
  	ecard_call(&req);
  }
  
  int ecard_readchunk(struct in_chunk_dir *cd, ecard_t *ec, int id, int num)
  {
  	struct ex_chunk_dir excd;
  	int index = 16;
  	int useld = 0;
  
  	if (!ec->cid.cd)
  		return 0;
  
  	while(1) {
  		ecard_readbytes(&excd, ec, index, 8, useld);
  		index += 8;
  		if (c_id(&excd) == 0) {
  			if (!useld && ec->loader) {
  				useld = 1;
  				index = 0;
  				continue;
  			}
  			return 0;
  		}
  		if (c_id(&excd) == 0xf0) { /* link */
  			index = c_start(&excd);
  			continue;
  		}
  		if (c_id(&excd) == 0x80) { /* loader */
  			if (!ec->loader) {
  				ec->loader = (loader_t)kmalloc(c_len(&excd),
  							       GFP_KERNEL);
  				if (ec->loader)
  					ecard_readbytes(ec->loader, ec,
  							(int)c_start(&excd),
  							c_len(&excd), useld);
  				else
  					return 0;
  			}
  			continue;
  		}
  		if (c_id(&excd) == id && num-- == 0)
  			break;
  	}
  
  	if (c_id(&excd) & 0x80) {
  		switch (c_id(&excd) & 0x70) {
  		case 0x70:
  			ecard_readbytes((unsigned char *)excd.d.string, ec,
  					(int)c_start(&excd), c_len(&excd),
  					useld);
  			break;
  		case 0x00:
  			break;
  		}
  	}
  	cd->start_offset = c_start(&excd);
  	memcpy(cd->d.string, excd.d.string, 256);
  	return 1;
  }
  
  /* ======================= Interrupt control ============================ */
  
  static void ecard_def_irq_enable(ecard_t *ec, int irqnr)
  {
  #ifdef HAS_EXPMASK
  	if (irqnr < 4 && have_expmask) {
  		have_expmask |= 1 << irqnr;
  		EXPMASK_ENABLE = have_expmask;
  	}
  #endif
  }
  
  static void ecard_def_irq_disable(ecard_t *ec, int irqnr)
  {
  #ifdef HAS_EXPMASK
  	if (irqnr < 4 && have_expmask) {
  		have_expmask &= ~(1 << irqnr);
  		EXPMASK_ENABLE = have_expmask;
  	}
  #endif
  }
  
  static int ecard_def_irq_pending(ecard_t *ec)
  {
  	return !ec->irqmask || ec->irqaddr[0] & ec->irqmask;
  }
  
  static void ecard_def_fiq_enable(ecard_t *ec, int fiqnr)
  {
  	panic("ecard_def_fiq_enable called - impossible");
  }
  
  static void ecard_def_fiq_disable(ecard_t *ec, int fiqnr)
  {
  	panic("ecard_def_fiq_disable called - impossible");
  }
  
  static int ecard_def_fiq_pending(ecard_t *ec)
  {
  	return !ec->fiqmask || ec->fiqaddr[0] & ec->fiqmask;
  }
  
  static expansioncard_ops_t ecard_default_ops = {
  	ecard_def_irq_enable,
  	ecard_def_irq_disable,
  	ecard_def_irq_pending,
  	ecard_def_fiq_enable,
  	ecard_def_fiq_disable,
  	ecard_def_fiq_pending
  };
  
  /*
   * Enable and disable interrupts from expansion cards.
   * (interrupts are disabled for these functions).
   *
   * They are not meant to be called directly, but via enable/disable_irq.
   */
  void ecard_enableirq(unsigned int irqnr)
  {
  	ecard_t *ec = slot_to_ecard(irqnr - 32);
  
  	if (ec) {
  		if (!ec->ops)
  			ec->ops = &ecard_default_ops;
  
  		if (ec->claimed && ec->ops->irqenable)
  			ec->ops->irqenable(ec, irqnr);
  		else
  			printk(KERN_ERR "ecard: rejecting request to "
  				"enable IRQs for %d\n", irqnr);
  	}
  }
  
  void ecard_disableirq(unsigned int irqnr)
  {
  	ecard_t *ec = slot_to_ecard(irqnr - 32);
  
  	if (ec) {
  		if (!ec->ops)
  			ec->ops = &ecard_default_ops;
  
  		if (ec->ops && ec->ops->irqdisable)
  			ec->ops->irqdisable(ec, irqnr);
  	}
  }
  
  void ecard_enablefiq(unsigned int fiqnr)
  {
  	ecard_t *ec = slot_to_ecard(fiqnr);
  
  	if (ec) {
  		if (!ec->ops)
  			ec->ops = &ecard_default_ops;
  
  		if (ec->claimed && ec->ops->fiqenable)
  			ec->ops->fiqenable(ec, fiqnr);
  		else
  			printk(KERN_ERR "ecard: rejecting request to "
  				"enable FIQs for %d\n", fiqnr);
  	}
  }
  
  void ecard_disablefiq(unsigned int fiqnr)
  {
  	ecard_t *ec = slot_to_ecard(fiqnr);
  
  	if (ec) {
  		if (!ec->ops)
  			ec->ops = &ecard_default_ops;
  
  		if (ec->ops->fiqdisable)
  			ec->ops->fiqdisable(ec, fiqnr);
  	}
  }
  
  static void
  ecard_dump_irq_state(ecard_t *ec)
  {
  	printk("  %d: %sclaimed, ",
  	       ec->slot_no,
  	       ec->claimed ? "" : "not ");
  
  	if (ec->ops && ec->ops->irqpending &&
  	    ec->ops != &ecard_default_ops)
  		printk("irq %spending\n",
  		       ec->ops->irqpending(ec) ? "" : "not ");
  	else
  		printk("irqaddr %p, mask = %02X, status = %02X\n",
  		       ec->irqaddr, ec->irqmask, *ec->irqaddr);
  }
  
  static void
  ecard_check_lockup(void)
  {
  	static int last, lockup;
  	ecard_t *ec;
  
  	/*
  	 * If the timer interrupt has not run since the last million
  	 * unrecognised expansion card interrupts, then there is
  	 * something seriously wrong.  Disable the expansion card
  	 * interrupts so at least we can continue.
  	 *
  	 * Maybe we ought to start a timer to re-enable them some time
  	 * later?
  	 */
  	if (last == jiffies) {
  		lockup += 1;
  		if (lockup > 1000000) {
  			printk(KERN_ERR "\nInterrupt lockup detected - "
  			       "disabling all expansion card interrupts\n");
  
  			disable_irq(IRQ_EXPANSIONCARD);
  
  			printk("Expansion card IRQ state:\n");
  
  			for (ec = cards; ec; ec = ec->next)
  				ecard_dump_irq_state(ec);
  		}
  	} else
  		lockup = 0;
  
  	/*
  	 * If we did not recognise the source of this interrupt,
  	 * warn the user, but don't flood the user with these messages.
  	 */
  	if (!last || time_after(jiffies, last + 5*HZ)) {
  		last = jiffies;
  		printk(KERN_WARNING "Unrecognised interrupt from backplane\n");
  	}
  }
  
  static void
  ecard_irq_noexpmask(int intr_no, void *dev_id, struct pt_regs *regs)
  {
  	ecard_t *ec;
  	int called = 0;
  
  	for (ec = cards; ec; ec = ec->next) {
  		int pending;
  
  		if (!ec->claimed || ec->irq == NO_IRQ || ec->slot_no == 8)
  			continue;
  
  		if (ec->ops && ec->ops->irqpending)
  			pending = ec->ops->irqpending(ec);
  		else
  			pending = ecard_default_ops.irqpending(ec);
  
  		if (pending) {
  			do_ecard_IRQ(ec->irq, regs);
  			called ++;
  		}
  	}
  	cli();
  
  	if (called == 0)
  		ecard_check_lockup();
  }
  
  #ifdef HAS_EXPMASK
  static unsigned char priority_masks[] =
  {
  	0xf0, 0xf1, 0xf3, 0xf7, 0xff, 0xff, 0xff, 0xff
  };
  
  static unsigned char first_set[] =
  {
  	0x00, 0x00, 0x01, 0x00, 0x02, 0x00, 0x01, 0x00,
  	0x03, 0x00, 0x01, 0x00, 0x02, 0x00, 0x01, 0x00
  };
  
  static void
  ecard_irq_expmask(int intr_no, void *dev_id, struct pt_regs *regs)
  {
  	const unsigned int statusmask = 15;
  	unsigned int status;
  
  	status = EXPMASK_STATUS & statusmask;
  	if (status) {
  		unsigned int slot;
  		ecard_t *ec;
  again:
  		slot = first_set[status];
  		ec = slot_to_ecard(slot);
  		if (ec->claimed) {
  			unsigned int oldexpmask;
  			/*
  			 * this ugly code is so that we can operate a
  			 * prioritorising system:
  			 *
  			 * Card 0 	highest priority
  			 * Card 1
  			 * Card 2
  			 * Card 3	lowest priority
  			 *
  			 * Serial cards should go in 0/1, ethernet/scsi in 2/3
  			 * otherwise you will lose serial data at high speeds!
  			 */
  			oldexpmask = have_expmask;
  			EXPMASK_ENABLE = (have_expmask &= priority_masks[slot]);
  			sti();
  			do_ecard_IRQ(ec->irq, regs);
  			cli();
  			EXPMASK_ENABLE = have_expmask = oldexpmask;
  			status = EXPMASK_STATUS & statusmask;
  			if (status)
  				goto again;
  		} else {
  			printk(KERN_WARNING "card%d: interrupt from unclaimed "
  			       "card???\n", slot);
  			EXPMASK_ENABLE = (have_expmask &= ~(1 << slot));
  		}
  	} else
  		printk(KERN_WARNING "Wild interrupt from backplane (masks)\n");
  }
  
  static void __init
  ecard_probeirqhw(void)
  {
  	ecard_t *ec;
  	int found;
  
  	EXPMASK_ENABLE = 0x00;
  	EXPMASK_STATUS = 0xff;
  	found = ((EXPMASK_STATUS & 15) == 0);
  	EXPMASK_ENABLE = 0xff;
  
  	if (!found)
  		return;
  
  	printk(KERN_DEBUG "Expansion card interrupt "
  	       "management hardware found\n");
  
  	irqexpansioncard.handler = ecard_irq_expmask;
  
  	/* for each card present, set a bit to '1' */
  	have_expmask = 0x80000000;
  
  	for (ec = cards; ec; ec = ec->next)
  		have_expmask |= 1 << ec->slot_no;
  
  	EXPMASK_ENABLE = have_expmask;
  }
  #else
  #define ecard_probeirqhw()
  #endif
  
  #ifndef IO_EC_MEMC8_BASE
  #define IO_EC_MEMC8_BASE 0
  #endif
  
  unsigned int ecard_address(ecard_t *ec, card_type_t type, card_speed_t speed)
  {
  	unsigned long address = 0;
  	int slot = ec->slot_no;
  
  	if (ec->slot_no == 8)
  		return IO_EC_MEMC8_BASE;
  
  	ectcr &= ~(1 << slot);
  
  	switch (type) {
  	case ECARD_MEMC:
  		if (slot < 4)
  			address = IO_EC_MEMC_BASE + (slot << 12);
  		break;
  
  	case ECARD_IOC:
  		if (slot < 4)
  			address = IO_EC_IOC_BASE + (slot << 12);
  #ifdef IO_EC_IOC4_BASE
  		else
  			address = IO_EC_IOC4_BASE + ((slot - 4) << 12);
  #endif
  		if (address)
  			address +=  speed << 17;
  		break;
  
  #ifdef IO_EC_EASI_BASE
  	case ECARD_EASI:
  		address = IO_EC_EASI_BASE + (slot << 22);
  		if (speed == ECARD_FAST)
  			ectcr |= 1 << slot;
  		break;
  #endif
  	default:
  		break;
  	}
  
  #ifdef IOMD_ECTCR
  	outb(ectcr, IOMD_ECTCR);
  #endif
  	return address;
  }
  
  static int ecard_prints(char *buffer, ecard_t *ec)
  {
  	char *start = buffer;
  
  	buffer += sprintf(buffer, "  %d: %s ", ec->slot_no,
  			  ec->type == ECARD_EASI ? "EASI" : "    ");
  
  	if (ec->cid.id == 0) {
  		struct in_chunk_dir incd;
  
  		buffer += sprintf(buffer, "[%04X:%04X] ",
  			ec->cid.manufacturer, ec->cid.product);
  
  		if (!ec->card_desc && ec->cid.cd &&
  		    ecard_readchunk(&incd, ec, 0xf5, 0)) {
  			ec->card_desc = kmalloc(strlen(incd.d.string)+1, GFP_KERNEL);
  
  			if (ec->card_desc)
  				strcpy((char *)ec->card_desc, incd.d.string);
  		}
  
  		buffer += sprintf(buffer, "%s\n", ec->card_desc ? ec->card_desc : "*unknown*");
  	} else
  		buffer += sprintf(buffer, "Simple card %d\n", ec->cid.id);
  
  	return buffer - start;
  }
  
  static int get_ecard_dev_info(char *buf, char **start, off_t pos, int count)
  {
  	ecard_t *ec = cards;
  	off_t at = 0;
  	int len, cnt;
  
  	cnt = 0;
  	while (ec && count > cnt) {
  		len = ecard_prints(buf, ec);
  		at += len;
  		if (at >= pos) {
  			if (!*start) {
  				*start = buf + (pos - (at - len));
  				cnt = at - pos;
  			} else
  				cnt += len;
  			buf += len;
  		}
  		ec = ec->next;
  	}
  	return (count > cnt) ? cnt : count;
  }
  
  static struct proc_dir_entry *proc_bus_ecard_dir = NULL;
  
  static void ecard_proc_init(void)
  {
  	proc_bus_ecard_dir = proc_mkdir("ecard", proc_bus);
  	create_proc_info_entry("devices", 0, proc_bus_ecard_dir,
  		get_ecard_dev_info);
  }
  
  /*
   * Probe for an expansion card.
   *
   * If bit 1 of the first byte of the card is set, then the
   * card does not exist.
   */
  static int __init
  ecard_probe(int slot, card_type_t type)
  {
  	ecard_t **ecp;
  	ecard_t *ec;
  	struct ex_ecid cid;
  	int i, rc = -ENOMEM;
  
  	ec = kmalloc(sizeof(ecard_t), GFP_KERNEL);
  
  	if (!ec)
  		goto nodev;
  
  	memset(ec, 0, sizeof(ecard_t));
  
  	ec->slot_no	= slot;
  	ec->type	= type;
  	ec->irq		= NO_IRQ;
  	ec->fiq		= NO_IRQ;
  	ec->dma		= NO_DMA;
  	ec->card_desc	= NULL;
  	ec->ops		= &ecard_default_ops;
  
  	rc = -ENODEV;
  	if ((ec->podaddr = ecard_address(ec, type, ECARD_SYNC)) == 0)
  		goto nodev;
  
  	cid.r_zero = 1;
  	ecard_readbytes(&cid, ec, 0, 16, 0);
  	if (cid.r_zero)
  		goto nodev;
  
  	ec->cid.id	= cid.r_id;
  	ec->cid.cd	= cid.r_cd;
  	ec->cid.is	= cid.r_is;
  	ec->cid.w	= cid.r_w;
  	ec->cid.manufacturer = ecard_getu16(cid.r_manu);
  	ec->cid.product = ecard_getu16(cid.r_prod);
  	ec->cid.country = cid.r_country;
  	ec->cid.irqmask = cid.r_irqmask;
  	ec->cid.irqoff  = ecard_gets24(cid.r_irqoff);
  	ec->cid.fiqmask = cid.r_fiqmask;
  	ec->cid.fiqoff  = ecard_gets24(cid.r_fiqoff);
  	ec->fiqaddr	=
  	ec->irqaddr	= (unsigned char *)ioaddr(ec->podaddr);
  
  	if (ec->cid.is) {
  		ec->irqmask = ec->cid.irqmask;
  		ec->irqaddr += ec->cid.irqoff;
  		ec->fiqmask = ec->cid.fiqmask;
  		ec->fiqaddr += ec->cid.fiqoff;
  	} else {
  		ec->irqmask = 1;
  		ec->fiqmask = 4;
  	}
  
  	for (i = 0; i < sizeof(blacklist) / sizeof(*blacklist); i++)
  		if (blacklist[i].manufacturer == ec->cid.manufacturer &&
  		    blacklist[i].product == ec->cid.product) {
  			ec->card_desc = blacklist[i].type;
  			break;
  		}
  
  	ec->irq = 32 + slot;
  #ifdef IO_EC_MEMC8_BASE
  	if (slot == 8)
  		ec->irq = 11;
  #endif
  #ifdef CONFIG_ARCH_RPC
  	/* On RiscPC, only first two slots have DMA capability */
  	if (slot < 2)
  		ec->dma = 2 + slot;
  #endif
  #if 0	/* We don't support FIQs on expansion cards at the moment */
  	ec->fiq = 96 + slot;
  #endif
  
  	rc = 0;
  
  	for (ecp = &cards; *ecp; ecp = &(*ecp)->next);
  
  	*ecp = ec;
  
  nodev:
  	if (rc && ec)
  		kfree(ec);
  	else
  		slot_to_expcard[slot] = ec;
  
  	return rc;
  }
  
  static ecard_t *finding_pos;
  
  void ecard_startfind(void)
  {
  	finding_pos = NULL;
  }
  
  ecard_t *ecard_find(int cid, const card_ids *cids)
  {
  	if (!finding_pos)
  		finding_pos = cards;
  	else
  		finding_pos = finding_pos->next;
  
  	for (; finding_pos; finding_pos = finding_pos->next) {
  		if (finding_pos->claimed)
  			continue;
  
  		if (!cids) {
  			if ((finding_pos->cid.id ^ cid) == 0)
  				break;
  		} else {
  			unsigned int manufacturer, product;
  			int i;
  
  			manufacturer = finding_pos->cid.manufacturer;
  			product = finding_pos->cid.product;
  
  			for (i = 0; cids[i].manufacturer != 65535; i++)
  				if (manufacturer == cids[i].manufacturer &&
  				    product == cids[i].product)
  					break;
  
  			if (cids[i].manufacturer != 65535)
  				break;
  		}
  	}
  
  	return finding_pos;
  }
  
  static void __init ecard_free_all(void)
  {
  	ecard_t *ec, *ecn;
  
  	for (ec = cards; ec; ec = ecn) {
  		ecn = ec->next;
  
  		kfree(ec);
  	}
  
  	cards = NULL;
  
  	memset(slot_to_expcard, 0, sizeof(slot_to_expcard));
  }
  
  /*
   * Initialise the expansion card system.
   * Locate all hardware - interrupt management and
   * actual cards.
   */
  void __init ecard_init(void)
  {
  	int slot;
  
  #ifdef CONFIG_CPU_32
  	init_waitqueue_head(&ecard_wait);
  	init_waitqueue_head(&ecard_done);
  #endif
  
  	printk("Probing expansion cards\n");
  
  	for (slot = 0; slot < 8; slot ++) {
  		if (ecard_probe(slot, ECARD_EASI) == -ENODEV)
  			ecard_probe(slot, ECARD_IOC);
  	}
  
  #ifdef IO_EC_MEMC8_BASE
  	ecard_probe(8, ECARD_IOC);
  #endif
  
  	ecard_probeirqhw();
  
  	if (setup_arm_irq(IRQ_EXPANSIONCARD, &irqexpansioncard)) {
  		printk(KERN_ERR "Unable to claim IRQ%d for expansion cards\n",
  		       IRQ_EXPANSIONCARD);
  		ecard_free_all();
  	}
  
  	ecard_proc_init();
  }
  
  EXPORT_SYMBOL(ecard_startfind);
  EXPORT_SYMBOL(ecard_find);
  EXPORT_SYMBOL(ecard_readchunk);
  EXPORT_SYMBOL(ecard_address);
  