/* ** 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 #include #include #include #if defined(MODULE) #include #endif #include #include #include #include #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 */ }; __initfunc(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