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ecard.c

/*
 *  linux/arch/arm/kernel/ecard.c
 *
 *  Copyright 1995-2001 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

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/sched.h>
#include <linux/interrupt.h>
#include <linux/completion.h>
#include <linux/reboot.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/device.h>
#include <linux/init.h>
#include <linux/mutex.h>
#include <linux/kthread.h>
#include <linux/io.h>

#include <asm/dma.h>
#include <asm/ecard.h>
#include <mach/hardware.h>
#include <asm/irq.h>
#include <asm/mmu_context.h>
#include <asm/mach/irq.h>
#include <asm/tlbflush.h>

#include "ecard.h"

#ifndef CONFIG_ARCH_RPC
#define HAVE_EXPMASK
#endif

00061 struct ecard_request {
      void        (*fn)(struct ecard_request *);
      ecard_t           *ec;
      unsigned int      address;
      unsigned int      length;
      unsigned int      use_loader;
      void        *buffer;
      struct completion *complete;
};

00071 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(unsigned long base, loader_t loader);
asmlinkage extern int
ecard_loader_read(int off, unsigned long base, loader_t loader);

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.
 */
static void ecard_task_reset(struct ecard_request *req)
{
      struct expansion_card *ec = req->ec;
      struct resource *res;

      res = ec->slot_no == 8
            ? &ec->resource[ECARD_RES_MEMC]
            : ec->easi
              ? &ec->resource[ECARD_RES_EASI]
              : &ec->resource[ECARD_RES_IOCSYNC];

      ecard_loader_reset(res->start, ec->loader);
}

static void ecard_task_readbytes(struct ecard_request *req)
{
      struct expansion_card *ec = req->ec;
      unsigned char *buf = req->buffer;
      unsigned int len = req->length;
      unsigned int off = req->address;

      if (ec->slot_no == 8) {
            void __iomem *base = (void __iomem *)
                        ec->resource[ECARD_RES_MEMC].start;

            /*
             * 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 page;

            page = (off >> 12) * 4;
            if (page > 256 * 4)
                  return;

            off &= 4095;

            /*
             * If we are reading offset 0, or our current index is
             * greater than the offset, reset the hardware index counter.
             */
            if (off == 0 || index > off) {
                  writeb(0, base);
                  index = 0;
            }

            /*
             * Increment the hardware index counter until we get to the
             * required offset.  The read bytes are discarded.
             */
            while (index < off) {
                  readb(base + page);
                  index += 1;
            }

            while (len--) {
                  *buf++ = readb(base + page);
                  index += 1;
            }
      } else {
            unsigned long base = (ec->easi
                   ? &ec->resource[ECARD_RES_EASI]
                   : &ec->resource[ECARD_RES_IOCSYNC])->start;
            void __iomem *pbase = (void __iomem *)base;

            if (!req->use_loader || !ec->loader) {
                  off *= 4;
                  while (len--) {
                        *buf++ = readb(pbase + 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,
                                             ec->loader);
                  }
            }
      }

}

static DECLARE_WAIT_QUEUE_HEAD(ecard_wait);
static struct ecard_request *ecard_req;
static DEFINE_MUTEX(ecard_mutex);

/*
 * Set up the expansion card daemon's page tables.
 */
static void ecard_init_pgtables(struct mm_struct *mm)
{
      struct vm_area_struct vma;

      /* 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;

      src_pgd = pgd_offset(mm, (unsigned long)IO_BASE);
      dst_pgd = pgd_offset(mm, IO_START);

      memcpy(dst_pgd, src_pgd, sizeof(pgd_t) * (IO_SIZE / PGDIR_SIZE));

      src_pgd = pgd_offset(mm, EASI_BASE);
      dst_pgd = pgd_offset(mm, EASI_START);

      memcpy(dst_pgd, src_pgd, sizeof(pgd_t) * (EASI_SIZE / PGDIR_SIZE));

      vma.vm_mm = mm;

      flush_tlb_range(&vma, IO_START, IO_START + IO_SIZE);
      flush_tlb_range(&vma, EASI_START, EASI_START + EASI_SIZE);
}

static int ecard_init_mm(void)
{
      struct mm_struct * mm = mm_alloc();
      struct mm_struct *active_mm = current->active_mm;

      if (!mm)
            return -ENOMEM;

      current->mm = mm;
      current->active_mm = mm;
      activate_mm(active_mm, mm);
      mmdrop(active_mm);
      ecard_init_pgtables(mm);
      return 0;
}

static int
ecard_task(void * unused)
{
      /*
       * Allocate a mm.  We're not a lazy-TLB kernel task since we need
       * to set page table entries where the user space would be.  Note
       * that this also creates the page tables.  Failure is not an
       * option here.
       */
      if (ecard_init_mm())
            panic("kecardd: unable to alloc mm\n");

      while (1) {
            struct ecard_request *req;

            wait_event_interruptible(ecard_wait, ecard_req != NULL);

            req = xchg(&ecard_req, NULL);
            if (req != NULL) {
                  req->fn(req);
                  complete(req->complete);
            }
      }
}

/*
 * Wake the expansion card daemon to action our request.
 *
 * FIXME: The test here is not sufficient to detect if the
 * kcardd is running.
 */
static void ecard_call(struct ecard_request *req)
{
      DECLARE_COMPLETION_ONSTACK(completion);

      req->complete = &completion;

      mutex_lock(&ecard_mutex);
      ecard_req = req;
      wake_up(&ecard_wait);

      /*
       * Now wait for kecardd to run.
       */
      wait_for_completion(&completion);
      mutex_unlock(&ecard_mutex);
}

/* ======================= Mid-level card control ===================== */

static void
ecard_readbytes(void *addr, ecard_t *ec, int off, int len, int useld)
{
      struct ecard_request req;

      req.fn            = ecard_task_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 = 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;
            __raw_writeb(have_expmask, EXPMASK_ENABLE);
      }
#endif
}

static void ecard_def_irq_disable(ecard_t *ec, int irqnr)
{
#ifdef HAS_EXPMASK
      if (irqnr < 4 && have_expmask) {
            have_expmask &= ~(1 << irqnr);
            __raw_writeb(have_expmask, EXPMASK_ENABLE);
      }
#endif
}

static int ecard_def_irq_pending(ecard_t *ec)
{
      return !ec->irqmask || readb(ec->irqaddr) & 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 || readb(ec->fiqaddr) & 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.
 */
static void ecard_irq_unmask(struct irq_data *d)
{
      ecard_t *ec = slot_to_ecard(d->irq - 32);

      if (ec) {
            if (!ec->ops)
                  ec->ops = &ecard_default_ops;

            if (ec->claimed && ec->ops->irqenable)
                  ec->ops->irqenable(ec, d->irq);
            else
                  printk(KERN_ERR "ecard: rejecting request to "
                        "enable IRQs for %d\n", d->irq);
      }
}

static void ecard_irq_mask(struct irq_data *d)
{
      ecard_t *ec = slot_to_ecard(d->irq - 32);

      if (ec) {
            if (!ec->ops)
                  ec->ops = &ecard_default_ops;

            if (ec->ops && ec->ops->irqdisable)
                  ec->ops->irqdisable(ec, d->irq);
      }
}

static struct irq_chip ecard_chip = {
      .name       = "ECARD",
      .irq_ack    = ecard_irq_mask,
      .irq_mask   = ecard_irq_mask,
      .irq_unmask = ecard_irq_unmask,
};

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(void)
{
      ecard_t *ec;

      printk("Expansion card IRQ state:\n");

      for (ec = cards; ec; ec = ec->next) {
            if (ec->slot_no == 8)
                  continue;

            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, readb(ec->irqaddr));
      }
}

static void ecard_check_lockup(struct irq_desc *desc)
{
      static unsigned long last;
      static int lockup;

      /*
       * 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");

                  desc->irq_data.chip->irq_mask(&desc->irq_data);
                  ecard_dump_irq_state();
            }
      } 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");
            ecard_dump_irq_state();
      }
}

static void
ecard_irq_handler(unsigned int irq, struct irq_desc *desc)
{
      ecard_t *ec;
      int called = 0;

      desc->irq_data.chip->irq_mask(&desc->irq_data);
      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) {
                  generic_handle_irq(ec->irq);
                  called ++;
            }
      }
      desc->irq_data.chip->irq_unmask(&desc->irq_data);

      if (called == 0)
            ecard_check_lockup(desc);
}

#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_irqexp_handler(unsigned int irq, struct irq_desc *desc)
{
      const unsigned int statusmask = 15;
      unsigned int status;

      status = __raw_readb(EXPMASK_STATUS) & statusmask;
      if (status) {
            unsigned int slot = first_set[status];
            ecard_t *ec = slot_to_ecard(slot);

            if (ec->claimed) {
                  /*
                   * 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!
                   */
                  generic_handle_irq(ec->irq);
            } else {
                  printk(KERN_WARNING "card%d: interrupt from unclaimed "
                         "card???\n", slot);
                  have_expmask &= ~(1 << slot);
                  __raw_writeb(have_expmask, EXPMASK_ENABLE);
            }
      } else
            printk(KERN_WARNING "Wild interrupt from backplane (masks)\n");
}

static int __init ecard_probeirqhw(void)
{
      ecard_t *ec;
      int found;

      __raw_writeb(0x00, EXPMASK_ENABLE);
      __raw_writeb(0xff, EXPMASK_STATUS);
      found = (__raw_readb(EXPMASK_STATUS) & 15) == 0;
      __raw_writeb(0xff, EXPMASK_ENABLE);

      if (found) {
            printk(KERN_DEBUG "Expansion card interrupt "
                   "management hardware found\n");

            /* 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;

            __raw_writeb(have_expmask, EXPMASK_ENABLE);
      }

      return found;
}
#else
#define ecard_irqexp_handler NULL
#define ecard_probeirqhw() (0)
#endif

#ifndef IO_EC_MEMC8_BASE
#define IO_EC_MEMC8_BASE 0
#endif

static 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
      iomd_writeb(ectcr, IOMD_ECTCR);
#endif
      return address;
}

static int ecard_prints(struct seq_file *m, ecard_t *ec)
{
      seq_printf(m, "  %d: %s ", ec->slot_no, ec->easi ? "EASI" : "    ");

      if (ec->cid.id == 0) {
            struct in_chunk_dir incd;

            seq_printf(m, "[%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);
            }

            seq_printf(m, "%s\n", ec->card_desc ? ec->card_desc : "*unknown*");
      } else
            seq_printf(m, "Simple card %d\n", ec->cid.id);

      return 0;
}

static int ecard_devices_proc_show(struct seq_file *m, void *v)
{
      ecard_t *ec = cards;

      while (ec) {
            ecard_prints(m, ec);
            ec = ec->next;
      }
      return 0;
}

static int ecard_devices_proc_open(struct inode *inode, struct file *file)
{
      return single_open(file, ecard_devices_proc_show, NULL);
}

static const struct file_operations bus_ecard_proc_fops = {
      .owner            = THIS_MODULE,
      .open       = ecard_devices_proc_open,
      .read       = seq_read,
      .llseek           = seq_lseek,
      .release    = single_release,
};

static struct proc_dir_entry *proc_bus_ecard_dir = NULL;

static void ecard_proc_init(void)
{
      proc_bus_ecard_dir = proc_mkdir("bus/ecard", NULL);
      proc_create("devices", 0, proc_bus_ecard_dir, &bus_ecard_proc_fops);
}

#define ec_set_resource(ec,nr,st,sz)                        \
      do {                                      \
            (ec)->resource[nr].name = dev_name(&ec->dev);   \
            (ec)->resource[nr].start = st;                  \
            (ec)->resource[nr].end = (st) + (sz) - 1; \
            (ec)->resource[nr].flags = IORESOURCE_MEM;      \
      } while (0)

static void __init ecard_free_card(struct expansion_card *ec)
{
      int i;

      for (i = 0; i < ECARD_NUM_RESOURCES; i++)
            if (ec->resource[i].flags)
                  release_resource(&ec->resource[i]);

      kfree(ec);
}

static struct expansion_card *__init ecard_alloc_card(int type, int slot)
{
      struct expansion_card *ec;
      unsigned long base;
      int i;

      ec = kzalloc(sizeof(ecard_t), GFP_KERNEL);
      if (!ec) {
            ec = ERR_PTR(-ENOMEM);
            goto nomem;
      }

      ec->slot_no = slot;
      ec->easi = type == ECARD_EASI;
      ec->irq = NO_IRQ;
      ec->fiq = NO_IRQ;
      ec->dma = NO_DMA;
      ec->ops = &ecard_default_ops;

      dev_set_name(&ec->dev, "ecard%d", slot);
      ec->dev.parent = NULL;
      ec->dev.bus = &ecard_bus_type;
      ec->dev.dma_mask = &ec->dma_mask;
      ec->dma_mask = (u64)0xffffffff;
      ec->dev.coherent_dma_mask = ec->dma_mask;

      if (slot < 4) {
            ec_set_resource(ec, ECARD_RES_MEMC,
                        PODSLOT_MEMC_BASE + (slot << 14),
                        PODSLOT_MEMC_SIZE);
            base = PODSLOT_IOC0_BASE + (slot << 14);
      } else
            base = PODSLOT_IOC4_BASE + ((slot - 4) << 14);

#ifdef CONFIG_ARCH_RPC
      if (slot < 8) {
            ec_set_resource(ec, ECARD_RES_EASI,
                        PODSLOT_EASI_BASE + (slot << 24),
                        PODSLOT_EASI_SIZE);
      }

      if (slot == 8) {
            ec_set_resource(ec, ECARD_RES_MEMC, NETSLOT_BASE, NETSLOT_SIZE);
      } else
#endif

      for (i = 0; i <= ECARD_RES_IOCSYNC - ECARD_RES_IOCSLOW; i++)
            ec_set_resource(ec, i + ECARD_RES_IOCSLOW,
                        base + (i << 19), PODSLOT_IOC_SIZE);

      for (i = 0; i < ECARD_NUM_RESOURCES; i++) {
            if (ec->resource[i].flags &&
                request_resource(&iomem_resource, &ec->resource[i])) {
                  dev_err(&ec->dev, "resource(s) not available\n");
                  ec->resource[i].end -= ec->resource[i].start;
                  ec->resource[i].start = 0;
                  ec->resource[i].flags = 0;
            }
      }

 nomem:
      return ec;
}

static ssize_t ecard_show_irq(struct device *dev, struct device_attribute *attr, char *buf)
{
      struct expansion_card *ec = ECARD_DEV(dev);
      return sprintf(buf, "%u\n", ec->irq);
}

static ssize_t ecard_show_dma(struct device *dev, struct device_attribute *attr, char *buf)
{
      struct expansion_card *ec = ECARD_DEV(dev);
      return sprintf(buf, "%u\n", ec->dma);
}

static ssize_t ecard_show_resources(struct device *dev, struct device_attribute *attr, char *buf)
{
      struct expansion_card *ec = ECARD_DEV(dev);
      char *str = buf;
      int i;

      for (i = 0; i < ECARD_NUM_RESOURCES; i++)
            str += sprintf(str, "%08x %08x %08lx\n",
                        ec->resource[i].start,
                        ec->resource[i].end,
                        ec->resource[i].flags);

      return str - buf;
}

static ssize_t ecard_show_vendor(struct device *dev, struct device_attribute *attr, char *buf)
{
      struct expansion_card *ec = ECARD_DEV(dev);
      return sprintf(buf, "%u\n", ec->cid.manufacturer);
}

static ssize_t ecard_show_device(struct device *dev, struct device_attribute *attr, char *buf)
{
      struct expansion_card *ec = ECARD_DEV(dev);
      return sprintf(buf, "%u\n", ec->cid.product);
}

static ssize_t ecard_show_type(struct device *dev, struct device_attribute *attr, char *buf)
{
      struct expansion_card *ec = ECARD_DEV(dev);
      return sprintf(buf, "%s\n", ec->easi ? "EASI" : "IOC");
}

static struct device_attribute ecard_dev_attrs[] = {
      __ATTR(device,   S_IRUGO, ecard_show_device,    NULL),
      __ATTR(dma,      S_IRUGO, ecard_show_dma,       NULL),
      __ATTR(irq,      S_IRUGO, ecard_show_irq,       NULL),
      __ATTR(resource, S_IRUGO, ecard_show_resources, NULL),
      __ATTR(type,     S_IRUGO, ecard_show_type,      NULL),
      __ATTR(vendor,   S_IRUGO, ecard_show_vendor,    NULL),
      __ATTR_NULL,
};


int ecard_request_resources(struct expansion_card *ec)
{
      int i, err = 0;

      for (i = 0; i < ECARD_NUM_RESOURCES; i++) {
            if (ecard_resource_end(ec, i) &&
                !request_mem_region(ecard_resource_start(ec, i),
                              ecard_resource_len(ec, i),
                              ec->dev.driver->name)) {
                  err = -EBUSY;
                  break;
            }
      }

      if (err) {
            while (i--)
                  if (ecard_resource_end(ec, i))
                        release_mem_region(ecard_resource_start(ec, i),
                                       ecard_resource_len(ec, i));
      }
      return err;
}
EXPORT_SYMBOL(ecard_request_resources);

void ecard_release_resources(struct expansion_card *ec)
{
      int i;

      for (i = 0; i < ECARD_NUM_RESOURCES; i++)
            if (ecard_resource_end(ec, i))
                  release_mem_region(ecard_resource_start(ec, i),
                                 ecard_resource_len(ec, i));
}
EXPORT_SYMBOL(ecard_release_resources);

void ecard_setirq(struct expansion_card *ec, const struct expansion_card_ops *ops, void *irq_data)
{
      ec->irq_data = irq_data;
      barrier();
      ec->ops = ops;
}
EXPORT_SYMBOL(ecard_setirq);

void __iomem *ecardm_iomap(struct expansion_card *ec, unsigned int res,
                     unsigned long offset, unsigned long maxsize)
{
      unsigned long start = ecard_resource_start(ec, res);
      unsigned long end = ecard_resource_end(ec, res);

      if (offset > (end - start))
            return NULL;

      start += offset;
      if (maxsize && end - start > maxsize)
            end = start + maxsize;
      
      return devm_ioremap(&ec->dev, start, end - start);
}
EXPORT_SYMBOL(ecardm_iomap);

/*
 * 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;

      ec = ecard_alloc_card(type, slot);
      if (IS_ERR(ec)) {
            rc = PTR_ERR(ec);
            goto nomem;
      }

      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 = (void __iomem *)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 < ARRAY_SIZE(blacklist); i++)
            if (blacklist[i].manufacturer == ec->cid.manufacturer &&
                blacklist[i].product == ec->cid.product) {
                  ec->card_desc = blacklist[i].type;
                  break;
            }

      /*
       * hook the interrupt handlers
       */
      if (slot < 8) {
            ec->irq = 32 + slot;
            set_irq_chip(ec->irq, &ecard_chip);
            set_irq_handler(ec->irq, handle_level_irq);
            set_irq_flags(ec->irq, IRQF_VALID);
      }

#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

      for (ecp = &cards; *ecp; ecp = &(*ecp)->next);

      *ecp = ec;
      slot_to_expcard[slot] = ec;

      device_register(&ec->dev);

      return 0;

 nodev:
      ecard_free_card(ec);
 nomem:
      return rc;
}

/*
 * Initialise the expansion card system.
 * Locate all hardware - interrupt management and
 * actual cards.
 */
static int __init ecard_init(void)
{
      struct task_struct *task;
      int slot, irqhw;

      task = kthread_run(ecard_task, NULL, "kecardd");
      if (IS_ERR(task)) {
            printk(KERN_ERR "Ecard: unable to create kernel thread: %ld\n",
                   PTR_ERR(task));
            return PTR_ERR(task);
      }

      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

      irqhw = ecard_probeirqhw();

      set_irq_chained_handler(IRQ_EXPANSIONCARD,
                        irqhw ? ecard_irqexp_handler : ecard_irq_handler);

      ecard_proc_init();

      return 0;
}

subsys_initcall(ecard_init);

/*
 *    ECARD "bus"
 */
static const struct ecard_id *
ecard_match_device(const struct ecard_id *ids, struct expansion_card *ec)
{
      int i;

      for (i = 0; ids[i].manufacturer != 65535; i++)
            if (ec->cid.manufacturer == ids[i].manufacturer &&
                ec->cid.product == ids[i].product)
                  return ids + i;

      return NULL;
}

static int ecard_drv_probe(struct device *dev)
{
      struct expansion_card *ec = ECARD_DEV(dev);
      struct ecard_driver *drv = ECARD_DRV(dev->driver);
      const struct ecard_id *id;
      int ret;

      id = ecard_match_device(drv->id_table, ec);

      ec->claimed = 1;
      ret = drv->probe(ec, id);
      if (ret)
            ec->claimed = 0;
      return ret;
}

static int ecard_drv_remove(struct device *dev)
{
      struct expansion_card *ec = ECARD_DEV(dev);
      struct ecard_driver *drv = ECARD_DRV(dev->driver);

      drv->remove(ec);
      ec->claimed = 0;

      /*
       * Restore the default operations.  We ensure that the
       * ops are set before we change the data.
       */
      ec->ops = &ecard_default_ops;
      barrier();
      ec->irq_data = NULL;

      return 0;
}

/*
 * Before rebooting, we must make sure that the expansion card is in a
 * sensible state, so it can be re-detected.  This means that the first
 * page of the ROM must be visible.  We call the expansion cards reset
 * handler, if any.
 */
static void ecard_drv_shutdown(struct device *dev)
{
      struct expansion_card *ec = ECARD_DEV(dev);
      struct ecard_driver *drv = ECARD_DRV(dev->driver);
      struct ecard_request req;

      if (dev->driver) {
            if (drv->shutdown)
                  drv->shutdown(ec);
            ec->claimed = 0;
      }

      /*
       * If this card has a loader, call the reset handler.
       */
      if (ec->loader) {
            req.fn = ecard_task_reset;
            req.ec = ec;
            ecard_call(&req);
      }
}

int ecard_register_driver(struct ecard_driver *drv)
{
      drv->drv.bus = &ecard_bus_type;

      return driver_register(&drv->drv);
}

void ecard_remove_driver(struct ecard_driver *drv)
{
      driver_unregister(&drv->drv);
}

static int ecard_match(struct device *_dev, struct device_driver *_drv)
{
      struct expansion_card *ec = ECARD_DEV(_dev);
      struct ecard_driver *drv = ECARD_DRV(_drv);
      int ret;

      if (drv->id_table) {
            ret = ecard_match_device(drv->id_table, ec) != NULL;
      } else {
            ret = ec->cid.id == drv->id;
      }

      return ret;
}

struct bus_type ecard_bus_type = {
      .name       = "ecard",
      .dev_attrs  = ecard_dev_attrs,
      .match            = ecard_match,
      .probe            = ecard_drv_probe,
      .remove           = ecard_drv_remove,
      .shutdown   = ecard_drv_shutdown,
};

static int ecard_bus_init(void)
{
      return bus_register(&ecard_bus_type);
}

postcore_initcall(ecard_bus_init);

EXPORT_SYMBOL(ecard_readchunk);
EXPORT_SYMBOL(ecard_register_driver);
EXPORT_SYMBOL(ecard_remove_driver);
EXPORT_SYMBOL(ecard_bus_type);

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