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mca_32.c

/*
 *  Written by Martin Kolinek, February 1996
 *
 * Changes:
 *
 *    Chris Beauregard July 28th, 1996
 *    - Fixed up integrated SCSI detection
 *
 *    Chris Beauregard August 3rd, 1996
 *    - Made mca_info local
 *    - Made integrated registers accessible through standard function calls
 *    - Added name field
 *    - More sanity checking
 *
 *    Chris Beauregard August 9th, 1996
 *    - Rewrote /proc/mca
 *
 *    Chris Beauregard January 7th, 1997
 *    - Added basic NMI-processing
 *    - Added more information to mca_info structure
 *
 *    David Weinehall October 12th, 1998
 *    - Made a lot of cleaning up in the source
 *    - Added use of save_flags / restore_flags
 *    - Added the 'driver_loaded' flag in MCA_adapter
 *    - Added an alternative implemention of ZP Gu's mca_find_unused_adapter
 *
 *    David Weinehall March 24th, 1999
 *    - Fixed the output of 'Driver Installed' in /proc/mca/pos
 *    - Made the Integrated Video & SCSI show up even if they have id 0000
 *
 *    Alexander Viro November 9th, 1999
 *    - Switched to regular procfs methods
 *
 *    Alfred Arnold & David Weinehall August 23rd, 2000
 *    - Added support for Planar POS-registers
 */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/mca.h>
#include <linux/kprobes.h>
#include <asm/system.h>
#include <asm/io.h>
#include <linux/proc_fs.h>
#include <linux/mman.h>
#include <linux/mm.h>
#include <linux/pagemap.h>
#include <linux/ioport.h>
#include <asm/uaccess.h>
#include <linux/init.h>
#include <asm/arch_hooks.h>

static unsigned char which_scsi = 0;

int MCA_bus = 0;
EXPORT_SYMBOL(MCA_bus);

/*
 * Motherboard register spinlock. Untested on SMP at the moment, but
 * are there any MCA SMP boxes?
 *
 * Yes - Alan
 */
static DEFINE_SPINLOCK(mca_lock);

/* Build the status info for the adapter */

static void mca_configure_adapter_status(struct mca_device *mca_dev) {
      mca_dev->status = MCA_ADAPTER_NONE;

      mca_dev->pos_id = mca_dev->pos[0]
            + (mca_dev->pos[1] << 8);

      if(!mca_dev->pos_id && mca_dev->slot < MCA_MAX_SLOT_NR) {

            /* id = 0x0000 usually indicates hardware failure,
             * however, ZP Gu (zpg@castle.net> reports that his 9556
             * has 0x0000 as id and everything still works. There
             * also seem to be an adapter with id = 0x0000; the
             * NCR Parallel Bus Memory Card. Until this is confirmed,
             * however, this code will stay.
             */

            mca_dev->status = MCA_ADAPTER_ERROR;

            return;
      } else if(mca_dev->pos_id != 0xffff) {

            /* 0xffff usually indicates that there's no adapter,
             * however, some integrated adapters may have 0xffff as
             * their id and still be valid. Examples are on-board
             * VGA of the 55sx, the integrated SCSI of the 56 & 57,
             * and possibly also the 95 ULTIMEDIA.
             */

            mca_dev->status = MCA_ADAPTER_NORMAL;
      }

      if((mca_dev->pos_id == 0xffff ||
          mca_dev->pos_id == 0x0000) && mca_dev->slot >= MCA_MAX_SLOT_NR) {
            int j;

            for(j = 2; j < 8; j++) {
                  if(mca_dev->pos[j] != 0xff) {
                        mca_dev->status = MCA_ADAPTER_NORMAL;
                        break;
                  }
            }
      }

      if(!(mca_dev->pos[2] & MCA_ENABLED)) {

            /* enabled bit is in POS 2 */

            mca_dev->status = MCA_ADAPTER_DISABLED;
      }
} /* mca_configure_adapter_status */

/*--------------------------------------------------------------------*/

static struct resource mca_standard_resources[] = {
      { .start = 0x60, .end = 0x60, .name = "system control port B (MCA)" },
      { .start = 0x90, .end = 0x90, .name = "arbitration (MCA)" },
      { .start = 0x91, .end = 0x91, .name = "card Select Feedback (MCA)" },
      { .start = 0x92, .end = 0x92, .name = "system Control port A (MCA)" },
      { .start = 0x94, .end = 0x94, .name = "system board setup (MCA)" },
      { .start = 0x96, .end = 0x97, .name = "POS (MCA)" },
      { .start = 0x100, .end = 0x107, .name = "POS (MCA)" }
};

#define MCA_STANDARD_RESOURCES      ARRAY_SIZE(mca_standard_resources)

/**
 *    mca_read_and_store_pos - read the POS registers into a memory buffer
 *      @pos: a char pointer to 8 bytes, contains the POS register value on
 *            successful return
 *
 *    Returns 1 if a card actually exists (i.e. the pos isn't
 *    all 0xff) or 0 otherwise
 */
static int mca_read_and_store_pos(unsigned char *pos) {
      int j;
      int found = 0;

      for(j=0; j<8; j++) {
            if((pos[j] = inb_p(MCA_POS_REG(j))) != 0xff) {
                  /* 0xff all across means no device. 0x00 means
                   * something's broken, but a device is
                   * probably there.  However, if you get 0x00
                   * from a motherboard register it won't matter
                   * what we find.  For the record, on the
                   * 57SLC, the integrated SCSI adapter has
                   * 0xffff for the adapter ID, but nonzero for
                   * other registers.  */

                  found = 1;
            }
      }
      return found;
}

static unsigned char mca_pc_read_pos(struct mca_device *mca_dev, int reg)
{
      unsigned char byte;
      unsigned long flags;

      if(reg < 0 || reg >= 8)
            return 0;

      spin_lock_irqsave(&mca_lock, flags);
      if(mca_dev->pos_register) {
            /* Disable adapter setup, enable motherboard setup */

            outb_p(0, MCA_ADAPTER_SETUP_REG);
            outb_p(mca_dev->pos_register, MCA_MOTHERBOARD_SETUP_REG);

            byte = inb_p(MCA_POS_REG(reg));
            outb_p(0xff, MCA_MOTHERBOARD_SETUP_REG);
      } else {

            /* Make sure motherboard setup is off */

            outb_p(0xff, MCA_MOTHERBOARD_SETUP_REG);

            /* Read the appropriate register */

            outb_p(0x8|(mca_dev->slot & 0xf), MCA_ADAPTER_SETUP_REG);
            byte = inb_p(MCA_POS_REG(reg));
            outb_p(0, MCA_ADAPTER_SETUP_REG);
      }
      spin_unlock_irqrestore(&mca_lock, flags);

      mca_dev->pos[reg] = byte;

      return byte;
}

static void mca_pc_write_pos(struct mca_device *mca_dev, int reg,
                       unsigned char byte)
{
      unsigned long flags;

      if(reg < 0 || reg >= 8)
            return;

      spin_lock_irqsave(&mca_lock, flags);

      /* Make sure motherboard setup is off */

      outb_p(0xff, MCA_MOTHERBOARD_SETUP_REG);

      /* Read in the appropriate register */

      outb_p(0x8|(mca_dev->slot&0xf), MCA_ADAPTER_SETUP_REG);
      outb_p(byte, MCA_POS_REG(reg));
      outb_p(0, MCA_ADAPTER_SETUP_REG);

      spin_unlock_irqrestore(&mca_lock, flags);

      /* Update the global register list, while we have the byte */

      mca_dev->pos[reg] = byte;

}

/* for the primary MCA bus, we have identity transforms */
static int mca_dummy_transform_irq(struct mca_device * mca_dev, int irq)
{
      return irq;
}

static int mca_dummy_transform_ioport(struct mca_device * mca_dev, int port)
{
      return port;
}

static void *mca_dummy_transform_memory(struct mca_device * mca_dev, void *mem)
{
      return mem;
}


static int __init mca_init(void)
{
      unsigned int i, j;
      struct mca_device *mca_dev;
      unsigned char pos[8];
      short mca_builtin_scsi_ports[] = {0xf7, 0xfd, 0x00};
      struct mca_bus *bus;

      /* WARNING: Be careful when making changes here. Putting an adapter
       * and the motherboard simultaneously into setup mode may result in
       * damage to chips (according to The Indispensible PC Hardware Book
       * by Hans-Peter Messmer). Also, we disable system interrupts (so
       * that we are not disturbed in the middle of this).
       */

      /* Make sure the MCA bus is present */

      if (mca_system_init()) {
            printk(KERN_ERR "MCA bus system initialisation failed\n");
            return -ENODEV;
      }

      if (!MCA_bus)
            return -ENODEV;

      printk(KERN_INFO "Micro Channel bus detected.\n");

      /* All MCA systems have at least a primary bus */
      bus = mca_attach_bus(MCA_PRIMARY_BUS);
      if (!bus)
            goto out_nomem;
      bus->default_dma_mask = 0xffffffffLL;
      bus->f.mca_write_pos = mca_pc_write_pos;
      bus->f.mca_read_pos = mca_pc_read_pos;
      bus->f.mca_transform_irq = mca_dummy_transform_irq;
      bus->f.mca_transform_ioport = mca_dummy_transform_ioport;
      bus->f.mca_transform_memory = mca_dummy_transform_memory;

      /* get the motherboard device */
      mca_dev = kzalloc(sizeof(struct mca_device), GFP_KERNEL);
      if(unlikely(!mca_dev))
            goto out_nomem;

      /*
       * We do not expect many MCA interrupts during initialization,
       * but let us be safe:
       */
      spin_lock_irq(&mca_lock);

      /* Make sure adapter setup is off */

      outb_p(0, MCA_ADAPTER_SETUP_REG);

      /* Read motherboard POS registers */

      mca_dev->pos_register = 0x7f;
      outb_p(mca_dev->pos_register, MCA_MOTHERBOARD_SETUP_REG);
      mca_dev->name[0] = 0;
      mca_read_and_store_pos(mca_dev->pos);
      mca_configure_adapter_status(mca_dev);
      /* fake POS and slot for a motherboard */
      mca_dev->pos_id = MCA_MOTHERBOARD_POS;
      mca_dev->slot = MCA_MOTHERBOARD;
      mca_register_device(MCA_PRIMARY_BUS, mca_dev);

      mca_dev = kzalloc(sizeof(struct mca_device), GFP_ATOMIC);
      if(unlikely(!mca_dev))
            goto out_unlock_nomem;

      /* Put motherboard into video setup mode, read integrated video
       * POS registers, and turn motherboard setup off.
       */

      mca_dev->pos_register = 0xdf;
      outb_p(mca_dev->pos_register, MCA_MOTHERBOARD_SETUP_REG);
      mca_dev->name[0] = 0;
      mca_read_and_store_pos(mca_dev->pos);
      mca_configure_adapter_status(mca_dev);
      /* fake POS and slot for the integrated video */
      mca_dev->pos_id = MCA_INTEGVIDEO_POS;
      mca_dev->slot = MCA_INTEGVIDEO;
      mca_register_device(MCA_PRIMARY_BUS, mca_dev);

      /* Put motherboard into scsi setup mode, read integrated scsi
       * POS registers, and turn motherboard setup off.
       *
       * It seems there are two possible SCSI registers. Martin says that
       * for the 56,57, 0xf7 is the one, but fails on the 76.
       * Alfredo (apena@vnet.ibm.com) says
       * 0xfd works on his machine. We'll try both of them. I figure it's
       * a good bet that only one could be valid at a time. This could
       * screw up though if one is used for something else on the other
       * machine.
       */

      for(i = 0; (which_scsi = mca_builtin_scsi_ports[i]) != 0; i++) {
            outb_p(which_scsi, MCA_MOTHERBOARD_SETUP_REG);
            if(mca_read_and_store_pos(pos))
                  break;
      }
      if(which_scsi) {
            /* found a scsi card */
            mca_dev = kzalloc(sizeof(struct mca_device), GFP_ATOMIC);
            if(unlikely(!mca_dev))
                  goto out_unlock_nomem;

            for(j = 0; j < 8; j++)
                  mca_dev->pos[j] = pos[j];

            mca_configure_adapter_status(mca_dev);
            /* fake POS and slot for integrated SCSI controller */
            mca_dev->pos_id = MCA_INTEGSCSI_POS;
            mca_dev->slot = MCA_INTEGSCSI;
            mca_dev->pos_register = which_scsi;
            mca_register_device(MCA_PRIMARY_BUS, mca_dev);
      }

      /* Turn off motherboard setup */

      outb_p(0xff, MCA_MOTHERBOARD_SETUP_REG);

      /* Now loop over MCA slots: put each adapter into setup mode, and
       * read its POS registers. Then put adapter setup off.
       */

      for(i=0; i<MCA_MAX_SLOT_NR; i++) {
            outb_p(0x8|(i&0xf), MCA_ADAPTER_SETUP_REG);
            if(!mca_read_and_store_pos(pos))
                  continue;

            mca_dev = kzalloc(sizeof(struct mca_device), GFP_ATOMIC);
            if(unlikely(!mca_dev))
                  goto out_unlock_nomem;

            for(j=0; j<8; j++)
                  mca_dev->pos[j]=pos[j];

            mca_dev->driver_loaded = 0;
            mca_dev->slot = i;
            mca_dev->pos_register = 0;
            mca_configure_adapter_status(mca_dev);
            mca_register_device(MCA_PRIMARY_BUS, mca_dev);
      }
      outb_p(0, MCA_ADAPTER_SETUP_REG);

      /* Enable interrupts and return memory start */
      spin_unlock_irq(&mca_lock);

      for (i = 0; i < MCA_STANDARD_RESOURCES; i++)
            request_resource(&ioport_resource, mca_standard_resources + i);

      mca_do_proc_init();

      return 0;

 out_unlock_nomem:
      spin_unlock_irq(&mca_lock);
 out_nomem:
      printk(KERN_EMERG "Failed memory allocation in MCA setup!\n");
      return -ENOMEM;
}

subsys_initcall(mca_init);

/*--------------------------------------------------------------------*/

static __kprobes void
mca_handle_nmi_device(struct mca_device *mca_dev, int check_flag)
{
      int slot = mca_dev->slot;

      if(slot == MCA_INTEGSCSI) {
            printk(KERN_CRIT "NMI: caused by MCA integrated SCSI adapter (%s)\n",
                  mca_dev->name);
      } else if(slot == MCA_INTEGVIDEO) {
            printk(KERN_CRIT "NMI: caused by MCA integrated video adapter (%s)\n",
                  mca_dev->name);
      } else if(slot == MCA_MOTHERBOARD) {
            printk(KERN_CRIT "NMI: caused by motherboard (%s)\n",
                  mca_dev->name);
      }

      /* More info available in POS 6 and 7? */

      if(check_flag) {
            unsigned char pos6, pos7;

            pos6 = mca_device_read_pos(mca_dev, 6);
            pos7 = mca_device_read_pos(mca_dev, 7);

            printk(KERN_CRIT "NMI: POS 6 = 0x%x, POS 7 = 0x%x\n", pos6, pos7);
      }

} /* mca_handle_nmi_slot */

/*--------------------------------------------------------------------*/

static int __kprobes mca_handle_nmi_callback(struct device *dev, void *data)
{
      struct mca_device *mca_dev = to_mca_device(dev);
      unsigned char pos5;

      pos5 = mca_device_read_pos(mca_dev, 5);

      if(!(pos5 & 0x80)) {
            /* Bit 7 of POS 5 is reset when this adapter has a hardware
             * error. Bit 7 it reset if there's error information
             * available in POS 6 and 7.
             */
            mca_handle_nmi_device(mca_dev, !(pos5 & 0x40));
            return 1;
      }
      return 0;
}

void __kprobes mca_handle_nmi(void)
{
      /* First try - scan the various adapters and see if a specific
       * adapter was responsible for the error.
       */
      bus_for_each_dev(&mca_bus_type, NULL, NULL, mca_handle_nmi_callback);

      mca_nmi_hook();
} /* mca_handle_nmi */

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