Import of Linux/MIPS 2.1.36

1 files changed, 354 insertions, 0 deletions

diff --git a/drivers/block/z2ram.c b/drivers/block/z2ram.c
new file mode 100644
index 000000000..0f556752d
--- /dev/null
+++ b/drivers/block/z2ram.c
@@ -0,0 +1,354 @@
+/*
+** 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
+**
+** 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 MAJOR_NR    Z2RAM_MAJOR
+
+#include <linux/major.h>
+#include <linux/malloc.h>
+#include <linux/blk.h>
+
+#if defined(MODULE)
+#include <linux/module.h>
+#endif
+
+#include <asm/setup.h>
+#include <asm/bitops.h>
+#include <asm/amigahw.h>
+#include <linux/zorro.h>
+
+#define TRUE                  (1)
+#define FALSE                 (0)
+
+#define Z2MINOR_COMBINED      (0)
+#define Z2MINOR_Z2ONLY        (1)
+#define Z2MINOR_CHIPONLY      (2)
+
+#define Z2RAM_CHUNK1024       ( Z2RAM_CHUNKSIZE >> 10 )
+
+static u_long *z2ram_map    = NULL;
+static u_long z2ram_size    = 0;
+static int z2_blocksizes[3] = { 1024, 1024, 1024 };
+static int z2_sizes[3]      = {    0,    0,    0 };
+static int z2_count         = 0;
+static int chip_count       = 0;
+static int current_device   = -1;
+
+static void
+do_z2_request( void )
+{
+    u_long start, len, addr, size;
+
+    while ( TRUE )
+    {
+        INIT_REQUEST;
+
+        start = CURRENT->sector << 9;
+        len  = CURRENT->current_nr_sectors << 9;
+
+        if ( ( start + len ) > z2ram_size )
+        {
+            printk( KERN_ERR DEVICE_NAME ": bad access: block=%ld, count=%ld\n",
+                CURRENT->sector,
+                CURRENT->current_nr_sectors);
+            end_request( FALSE );
+            continue;
+        }
+
+        if ( ( CURRENT->cmd != READ ) && ( CURRENT->cmd != WRITE ) )
+        {
+            printk( KERN_ERR DEVICE_NAME ": bad command: %d\n", CURRENT->cmd );
+            end_request( FALSE );
+            continue;
+        }
+
+        while ( len ) 
+        {
+            addr = start & Z2RAM_CHUNKMASK;
+            size = Z2RAM_CHUNKSIZE - addr;
+            if ( len < size )
+                size = len;
+
+            addr += z2ram_map[ start >> Z2RAM_CHUNKSHIFT ];
+
+            if ( CURRENT->cmd == READ )
+                memcpy( CURRENT->buffer, (char *)addr, size );
+            else
+                memcpy( (char *)addr, CURRENT->buffer, size );
+
+            start += size;
+            len -= size;
+        }
+
+        end_request( TRUE );
+    }
+}
+
+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 );
+
+        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] );
+
+    device = DEVICE_NR( inode->i_rdev );
+
+    if ( current_device != -1 && current_device != device )
+    {
+        return -EBUSY;
+    }
+
+    if ( current_device == -1 )
+    {
+        z2_count   = 0;
+        chip_count = 0;
+        z2ram_size = 0;
+
+        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" );
+                    return -ENOMEM;
+                }
+
+                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" );
+                    return -ENOMEM;
+                }
+
+                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" );
+                    return -ENOMEM;
+                }
+
+                get_chipram();
+
+                if ( z2ram_size != 0 )
+                    printk( KERN_INFO DEVICE_NAME 
+                        ": using %iK Chip RAM\n",
+                        chip_count * Z2RAM_CHUNK1024 );
+                    
+            break;
+
+            default:
+                return -ENODEV;
+        }
+
+        if ( z2ram_size == 0 )
+        {
+            kfree( z2ram_map );
+            printk( KERN_NOTICE DEVICE_NAME
+                ": no unused ZII/Chip RAM found\n" );
+            return -ENOMEM;
+        }
+
+        current_device = device;
+        z2ram_size <<= Z2RAM_CHUNKSHIFT;
+        z2_sizes[ device ] = z2ram_size >> 10;
+        blk_size[ MAJOR_NR ] = z2_sizes;
+    }
+
+#if defined(MODULE)
+    MOD_INC_USE_COUNT;
+#endif
+
+    return 0;
+}
+
+static void 
+z2_release( struct inode *inode, struct file *filp )
+{
+
+    if ( current_device == -1 )
+        return;     
+
+    sync_dev( inode->i_rdev );
+
+#if defined(MODULE)
+    MOD_DEC_USE_COUNT;
+#endif
+
+    return;
+}
+
+static struct file_operations z2_fops =
+{
+        NULL,                   /* lseek - default */
+        block_read,             /* read - general block-dev read */
+        block_write,            /* write - general block-dev write */
+        NULL,                   /* readdir - bad */
+        NULL,                   /* poll */
+        NULL,                   /* ioctl */
+        NULL,                   /* mmap */
+        z2_open,                /* open */
+        z2_release,             /* release */
+        block_fsync             /* fsync */
+};
+
+int
+z2_init( void )
+{
+
+    if ( !MACH_IS_AMIGA )
+        return -ENXIO;
+
+    if ( register_blkdev( MAJOR_NR, DEVICE_NAME, &z2_fops ) )
+    {
+        printk( KERN_ERR DEVICE_NAME ": Unable to get major %d\n",
+            MAJOR_NR );
+        return -EBUSY;
+    }
+   
+    blk_dev[ MAJOR_NR ].request_fn = DEVICE_REQUEST;
+    blksize_size[ MAJOR_NR ] = z2_blocksizes;
+    blk_size[ MAJOR_NR ] = z2_sizes;
+
+    return 0;
+}
+
+#if defined(MODULE)
+int
+init_module( void )
+{
+    int error;
+    
+    error = z2_init();
+    if ( error == 0 )
+    {
+        printk( KERN_INFO DEVICE_NAME ": loaded as module\n" );
+    }
+    
+    return error;
+}
+
+void
+cleanup_module( void )
+{
+    int i, j;
+
+    if ( unregister_blkdev( MAJOR_NR, DEVICE_NAME ) != 0 )
+        printk( KERN_ERR DEVICE_NAME ": unregister of device failed\n");
+
+    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;
+} 
+#endif