1 files changed, 429 insertions, 0 deletions

diff --git a/drivers/block/z2ram.c b/drivers/block/z2ram.c
new file mode 100644
index 000000000000..007f6a662439
--- /dev/null
+++ b/drivers/block/z2ram.c
@@ -0,0 +1,429 @@
+/*
+** 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 TRUE                  (1)
+#define FALSE                 (0)
+
+#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(request_queue_t *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;
+
+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");
+    strcpy(z2ram_gendisk->devfs_name, z2ram_gendisk->disk_name);
+
+    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;
+}
+
+#if defined(MODULE)
+
+MODULE_LICENSE("GPL");
+
+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;
+    blk_unregister_region(MKDEV(Z2RAM_MAJOR, 0), 256);
+    if ( unregister_blkdev( Z2RAM_MAJOR, DEVICE_NAME ) != 0 )
+        printk( KERN_ERR DEVICE_NAME ": unregister of device failed\n");
+
+    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;
+} 
+#endif