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z2ram.c

/*
** z2ram - Amiga pseudo-driver to access 16bit-RAM in ZorroII space
**         as a block device, to be used as a RAM disk or swap space
** 
** Copyright (C) 1994 by Ingo Wilken (Ingo.Wilken@informatik.uni-oldenburg.de)
**
** ++Geert: support for zorro_unused_z2ram, better range checking
** ++roman: translate accesses via an array
** ++Milan: support for ChipRAM usage
** ++yambo: converted to 2.0 kernel
** ++yambo: modularized and support added for 3 minor devices including:
**          MAJOR  MINOR  DESCRIPTION
**          -----  -----  ----------------------------------------------
**          37     0       Use Zorro II and Chip ram
**          37     1       Use only Zorro II ram
**          37     2       Use only Chip ram
**          37     4-7     Use memory list entry 1-4 (first is 0)
** ++jskov: support for 1-4th memory list entry.
**
** Permission to use, copy, modify, and distribute this software and its
** documentation for any purpose and without fee is hereby granted, provided
** that the above copyright notice appear in all copies and that both that
** copyright notice and this permission notice appear in supporting
** documentation.  This software is provided "as is" without express or
** implied warranty.
*/

#define DEVICE_NAME "Z2RAM"

#include <linux/major.h>
#include <linux/vmalloc.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/blkdev.h>
#include <linux/bitops.h>

#include <asm/setup.h>
#include <asm/amigahw.h>
#include <asm/pgtable.h>

#include <linux/zorro.h>


extern int m68k_realnum_memory;
extern struct mem_info m68k_memory[NUM_MEMINFO];

#define Z2MINOR_COMBINED      (0)
#define Z2MINOR_Z2ONLY        (1)
#define Z2MINOR_CHIPONLY      (2)
#define Z2MINOR_MEMLIST1      (4)
#define Z2MINOR_MEMLIST2      (5)
#define Z2MINOR_MEMLIST3      (6)
#define Z2MINOR_MEMLIST4      (7)
#define Z2MINOR_COUNT         (8) /* Move this down when adding a new minor */

#define Z2RAM_CHUNK1024       ( Z2RAM_CHUNKSIZE >> 10 )

static u_long *z2ram_map    = NULL;
static u_long z2ram_size    = 0;
static int z2_count         = 0;
static int chip_count       = 0;
static int list_count       = 0;
static int current_device   = -1;

static DEFINE_SPINLOCK(z2ram_lock);

static struct block_device_operations z2_fops;
static struct gendisk *z2ram_gendisk;

static void do_z2_request(struct request_queue *q)
{
      struct request *req;
      while ((req = elv_next_request(q)) != NULL) {
            unsigned long start = req->sector << 9;
            unsigned long len  = req->current_nr_sectors << 9;

            if (start + len > z2ram_size) {
                  printk( KERN_ERR DEVICE_NAME ": bad access: block=%lu, count=%u\n",
                        req->sector, req->current_nr_sectors);
                  end_request(req, 0);
                  continue;
            }
            while (len) {
                  unsigned long addr = start & Z2RAM_CHUNKMASK;
                  unsigned long size = Z2RAM_CHUNKSIZE - addr;
                  if (len < size)
                        size = len;
                  addr += z2ram_map[ start >> Z2RAM_CHUNKSHIFT ];
                  if (rq_data_dir(req) == READ)
                        memcpy(req->buffer, (char *)addr, size);
                  else
                        memcpy((char *)addr, req->buffer, size);
                  start += size;
                  len -= size;
            }
            end_request(req, 1);
      }
}

static void
get_z2ram( void )
{
    int i;

    for ( i = 0; i < Z2RAM_SIZE / Z2RAM_CHUNKSIZE; i++ )
    {
      if ( test_bit( i, zorro_unused_z2ram ) )
      {
          z2_count++;
          z2ram_map[ z2ram_size++ ] = 
            ZTWO_VADDR( Z2RAM_START ) + ( i << Z2RAM_CHUNKSHIFT );
          clear_bit( i, zorro_unused_z2ram );
      }
    }

    return;
}

static void
get_chipram( void )
{

    while ( amiga_chip_avail() > ( Z2RAM_CHUNKSIZE * 4 ) )
    {
      chip_count++;
      z2ram_map[ z2ram_size ] =
          (u_long)amiga_chip_alloc( Z2RAM_CHUNKSIZE, "z2ram" );

      if ( z2ram_map[ z2ram_size ] == 0 )
      {
          break;
      }

      z2ram_size++;
    }
      
    return;
}

static int
z2_open( struct inode *inode, struct file *filp )
{
    int device;
    int max_z2_map = ( Z2RAM_SIZE / Z2RAM_CHUNKSIZE ) *
      sizeof( z2ram_map[0] );
    int max_chip_map = ( amiga_chip_size / Z2RAM_CHUNKSIZE ) *
      sizeof( z2ram_map[0] );
    int rc = -ENOMEM;

    device = iminor(inode);

    if ( current_device != -1 && current_device != device )
    {
      rc = -EBUSY;
      goto err_out;
    }

    if ( current_device == -1 )
    {
      z2_count   = 0;
      chip_count = 0;
      list_count = 0;
      z2ram_size = 0;

      /* Use a specific list entry. */
      if (device >= Z2MINOR_MEMLIST1 && device <= Z2MINOR_MEMLIST4) {
            int index = device - Z2MINOR_MEMLIST1 + 1;
            unsigned long size, paddr, vaddr;

            if (index >= m68k_realnum_memory) {
                  printk( KERN_ERR DEVICE_NAME
                        ": no such entry in z2ram_map\n" );
                    goto err_out;
            }

            paddr = m68k_memory[index].addr;
            size = m68k_memory[index].size & ~(Z2RAM_CHUNKSIZE-1);

#ifdef __powerpc__
            /* FIXME: ioremap doesn't build correct memory tables. */
            {
                  vfree(vmalloc (size));
            }

            vaddr = (unsigned long) __ioremap (paddr, size, 
                                       _PAGE_WRITETHRU);

#else
            vaddr = (unsigned long)z_remap_nocache_nonser(paddr, size);
#endif
            z2ram_map = 
                  kmalloc((size/Z2RAM_CHUNKSIZE)*sizeof(z2ram_map[0]),
                        GFP_KERNEL);
            if ( z2ram_map == NULL )
            {
                printk( KERN_ERR DEVICE_NAME
                  ": cannot get mem for z2ram_map\n" );
                goto err_out;
            }

            while (size) {
                  z2ram_map[ z2ram_size++ ] = vaddr;
                  size -= Z2RAM_CHUNKSIZE;
                  vaddr += Z2RAM_CHUNKSIZE;
                  list_count++;
            }

            if ( z2ram_size != 0 )
                printk( KERN_INFO DEVICE_NAME
                  ": using %iK List Entry %d Memory\n",
                  list_count * Z2RAM_CHUNK1024, index );
      } else

      switch ( device )
      {
          case Z2MINOR_COMBINED:

            z2ram_map = kmalloc( max_z2_map + max_chip_map, GFP_KERNEL );
            if ( z2ram_map == NULL )
            {
                printk( KERN_ERR DEVICE_NAME
                  ": cannot get mem for z2ram_map\n" );
                goto err_out;
            }

            get_z2ram();
            get_chipram();

            if ( z2ram_size != 0 )
                printk( KERN_INFO DEVICE_NAME 
                  ": using %iK Zorro II RAM and %iK Chip RAM (Total %dK)\n",
                  z2_count * Z2RAM_CHUNK1024,
                  chip_count * Z2RAM_CHUNK1024,
                  ( z2_count + chip_count ) * Z2RAM_CHUNK1024 );

          break;

          case Z2MINOR_Z2ONLY:
            z2ram_map = kmalloc( max_z2_map, GFP_KERNEL );
            if ( z2ram_map == NULL )
            {
                printk( KERN_ERR DEVICE_NAME
                  ": cannot get mem for z2ram_map\n" );
                goto err_out;
            }

            get_z2ram();

            if ( z2ram_size != 0 )
                printk( KERN_INFO DEVICE_NAME 
                  ": using %iK of Zorro II RAM\n",
                  z2_count * Z2RAM_CHUNK1024 );

          break;

          case Z2MINOR_CHIPONLY:
            z2ram_map = kmalloc( max_chip_map, GFP_KERNEL );
            if ( z2ram_map == NULL )
            {
                printk( KERN_ERR DEVICE_NAME
                  ": cannot get mem for z2ram_map\n" );
                goto err_out;
            }

            get_chipram();

            if ( z2ram_size != 0 )
                printk( KERN_INFO DEVICE_NAME 
                  ": using %iK Chip RAM\n",
                  chip_count * Z2RAM_CHUNK1024 );
                
          break;

          default:
            rc = -ENODEV;
            goto err_out;
      
          break;
      }

      if ( z2ram_size == 0 )
      {
          printk( KERN_NOTICE DEVICE_NAME
            ": no unused ZII/Chip RAM found\n" );
          goto err_out_kfree;
      }

      current_device = device;
      z2ram_size <<= Z2RAM_CHUNKSHIFT;
      set_capacity(z2ram_gendisk, z2ram_size >> 9);
    }

    return 0;

err_out_kfree:
    kfree(z2ram_map);
err_out:
    return rc;
}

static int
z2_release( struct inode *inode, struct file *filp )
{
    if ( current_device == -1 )
      return 0;     

    /*
     * FIXME: unmap memory
     */

    return 0;
}

static struct block_device_operations z2_fops =
{
      .owner            = THIS_MODULE,
      .open       = z2_open,
      .release    = z2_release,
};

static struct kobject *z2_find(dev_t dev, int *part, void *data)
{
      *part = 0;
      return get_disk(z2ram_gendisk);
}

static struct request_queue *z2_queue;

static int __init 
z2_init(void)
{
    int ret;

    if (!MACH_IS_AMIGA)
      return -ENXIO;

    ret = -EBUSY;
    if (register_blkdev(Z2RAM_MAJOR, DEVICE_NAME))
      goto err;

    ret = -ENOMEM;
    z2ram_gendisk = alloc_disk(1);
    if (!z2ram_gendisk)
      goto out_disk;

    z2_queue = blk_init_queue(do_z2_request, &z2ram_lock);
    if (!z2_queue)
      goto out_queue;

    z2ram_gendisk->major = Z2RAM_MAJOR;
    z2ram_gendisk->first_minor = 0;
    z2ram_gendisk->fops = &z2_fops;
    sprintf(z2ram_gendisk->disk_name, "z2ram");

    z2ram_gendisk->queue = z2_queue;
    add_disk(z2ram_gendisk);
    blk_register_region(MKDEV(Z2RAM_MAJOR, 0), Z2MINOR_COUNT, THIS_MODULE,
                        z2_find, NULL, NULL);

    return 0;

out_queue:
    put_disk(z2ram_gendisk);
out_disk:
    unregister_blkdev(Z2RAM_MAJOR, DEVICE_NAME);
err:
    return ret;
}

static void __exit z2_exit(void)
{
    int i, j;
    blk_unregister_region(MKDEV(Z2RAM_MAJOR, 0), 256);
    unregister_blkdev(Z2RAM_MAJOR, DEVICE_NAME);
    del_gendisk(z2ram_gendisk);
    put_disk(z2ram_gendisk);
    blk_cleanup_queue(z2_queue);

    if ( current_device != -1 )
    {
      i = 0;

      for ( j = 0 ; j < z2_count; j++ )
      {
          set_bit( i++, zorro_unused_z2ram ); 
      }

      for ( j = 0 ; j < chip_count; j++ )
      {
          if ( z2ram_map[ i ] )
          {
            amiga_chip_free( (void *) z2ram_map[ i++ ] );
          }
      }

      if ( z2ram_map != NULL )
      {
          kfree( z2ram_map );
      }
    }

    return;
} 

module_init(z2_init);
module_exit(z2_exit);
MODULE_LICENSE("GPL");

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