Initial import

1 files changed, 418 insertions, 0 deletions

diff --git a/drivers/block/z2ram.c b/drivers/block/z2ram.c
new file mode 100644
index 000000000..968f9e52e
--- /dev/null
+++ b/drivers/block/z2ram.c
@@ -0,0 +1,418 @@
+/*
+** 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 <linux/mutex.h>
+#include <linux/slab.h>
+
+#include <asm/setup.h>
+#include <asm/amigahw.h>
+#include <asm/pgtable.h>
+
+#include <linux/zorro.h>
+
+
+#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 DEFINE_MUTEX(z2ram_mutex);
+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 gendisk *z2ram_gendisk;
+
+static void do_z2_request(struct request_queue *q)
+{
+	struct request *req;
+
+	req = blk_fetch_request(q);
+	while (req) {
+		unsigned long start = blk_rq_pos(req) << 9;
+		unsigned long len  = blk_rq_cur_bytes(req);
+		int err = 0;
+
+		if (start + len > z2ram_size) {
+			pr_err(DEVICE_NAME ": bad access: block=%llu, "
+			       "count=%u\n",
+			       (unsigned long long)blk_rq_pos(req),
+			       blk_rq_cur_sectors(req));
+			err = -EIO;
+			goto done;
+		}
+		while (len) {
+			unsigned long addr = start & Z2RAM_CHUNKMASK;
+			unsigned long size = Z2RAM_CHUNKSIZE - addr;
+			void *buffer = bio_data(req->bio);
+
+			if (len < size)
+				size = len;
+			addr += z2ram_map[ start >> Z2RAM_CHUNKSHIFT ];
+			if (rq_data_dir(req) == READ)
+				memcpy(buffer, (char *)addr, size);
+			else
+				memcpy((char *)addr, buffer, size);
+			start += size;
+			len -= size;
+		}
+	done:
+		if (!__blk_end_request_cur(req, err))
+			req = blk_fetch_request(q);
+	}
+}
+
+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++] = (unsigned long)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 block_device *bdev, fmode_t mode)
+{
+    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 = MINOR(bdev->bd_dev);
+
+    mutex_lock(&z2ram_mutex);
+    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);
+    }
+
+    mutex_unlock(&z2ram_mutex);
+    return 0;
+
+err_out_kfree:
+    kfree(z2ram_map);
+err_out:
+    mutex_unlock(&z2ram_mutex);
+    return rc;
+}
+
+static void
+z2_release(struct gendisk *disk, fmode_t mode)
+{
+    mutex_lock(&z2ram_mutex);
+    if ( current_device == -1 ) {
+    	mutex_unlock(&z2ram_mutex);
+    	return;
+    }
+    mutex_unlock(&z2ram_mutex);
+    /*
+     * FIXME: unmap memory
+     */
+}
+
+static const 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 -ENODEV;
+
+    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), Z2MINOR_COUNT);
+    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");