| /* |
| ** 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 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(struct request_queue *q) |
| { |
| struct request *req; |
| while ((req = elv_next_request(q)) != NULL) { |
| unsigned long start = blk_rq_pos(req) << 9; |
| unsigned long len = blk_rq_cur_bytes(req); |
| |
| if (start + len > z2ram_size) { |
| printk( KERN_ERR DEVICE_NAME ": bad access: block=%lu, count=%u\n", |
| blk_rq_pos(req), blk_rq_cur_sectors(req)); |
| __blk_end_request_cur(req, -EIO); |
| 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; |
| } |
| __blk_end_request_cur(req, 0); |
| } |
| } |
| |
| 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 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); |
| |
| 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 gendisk *disk, fmode_t mode) |
| { |
| 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; |
| |
| 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), 256); |
| 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"); |