diff options
Diffstat (limited to 'kernel/drivers/block/z2ram.c')
| -rw-r--r-- | kernel/drivers/block/z2ram.c | 418 |
1 files changed, 418 insertions, 0 deletions
diff --git a/kernel/drivers/block/z2ram.c b/kernel/drivers/block/z2ram.c new file mode 100644 index 000000000..968f9e52e --- /dev/null +++ b/kernel/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"); |