--- /dev/null
+/*
+** 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");
Code Review / kvmfornfv.git / blobdiff