419 lines
9.1 KiB
C
419 lines
9.1 KiB
C
/*
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** z2ram - Amiga pseudo-driver to access 16bit-RAM in ZorroII space
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** as a block device, to be used as a RAM disk or swap space
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**
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** Copyright (C) 1994 by Ingo Wilken (Ingo.Wilken@informatik.uni-oldenburg.de)
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**
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** ++Geert: support for zorro_unused_z2ram, better range checking
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** ++roman: translate accesses via an array
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** ++Milan: support for ChipRAM usage
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** ++yambo: converted to 2.0 kernel
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** ++yambo: modularized and support added for 3 minor devices including:
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** MAJOR MINOR DESCRIPTION
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** ----- ----- ----------------------------------------------
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** 37 0 Use Zorro II and Chip ram
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** 37 1 Use only Zorro II ram
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** 37 2 Use only Chip ram
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** 37 4-7 Use memory list entry 1-4 (first is 0)
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** ++jskov: support for 1-4th memory list entry.
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**
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** Permission to use, copy, modify, and distribute this software and its
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** documentation for any purpose and without fee is hereby granted, provided
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** that the above copyright notice appear in all copies and that both that
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** copyright notice and this permission notice appear in supporting
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** documentation. This software is provided "as is" without express or
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** implied warranty.
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*/
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#define DEVICE_NAME "Z2RAM"
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#include <linux/major.h>
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#include <linux/vmalloc.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/blkdev.h>
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#include <linux/bitops.h>
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#include <linux/mutex.h>
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#include <linux/slab.h>
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#include <asm/setup.h>
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#include <asm/amigahw.h>
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#include <asm/pgtable.h>
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#include <linux/zorro.h>
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#define Z2MINOR_COMBINED (0)
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#define Z2MINOR_Z2ONLY (1)
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#define Z2MINOR_CHIPONLY (2)
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#define Z2MINOR_MEMLIST1 (4)
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#define Z2MINOR_MEMLIST2 (5)
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#define Z2MINOR_MEMLIST3 (6)
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#define Z2MINOR_MEMLIST4 (7)
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#define Z2MINOR_COUNT (8) /* Move this down when adding a new minor */
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#define Z2RAM_CHUNK1024 ( Z2RAM_CHUNKSIZE >> 10 )
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static DEFINE_MUTEX(z2ram_mutex);
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static u_long *z2ram_map = NULL;
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static u_long z2ram_size = 0;
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static int z2_count = 0;
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static int chip_count = 0;
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static int list_count = 0;
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static int current_device = -1;
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static DEFINE_SPINLOCK(z2ram_lock);
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static struct gendisk *z2ram_gendisk;
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static void do_z2_request(struct request_queue *q)
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{
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struct request *req;
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req = blk_fetch_request(q);
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while (req) {
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unsigned long start = blk_rq_pos(req) << 9;
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unsigned long len = blk_rq_cur_bytes(req);
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int err = 0;
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if (start + len > z2ram_size) {
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pr_err(DEVICE_NAME ": bad access: block=%llu, "
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"count=%u\n",
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(unsigned long long)blk_rq_pos(req),
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blk_rq_cur_sectors(req));
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err = -EIO;
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goto done;
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}
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while (len) {
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unsigned long addr = start & Z2RAM_CHUNKMASK;
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unsigned long size = Z2RAM_CHUNKSIZE - addr;
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void *buffer = bio_data(req->bio);
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if (len < size)
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size = len;
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addr += z2ram_map[ start >> Z2RAM_CHUNKSHIFT ];
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if (rq_data_dir(req) == READ)
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memcpy(buffer, (char *)addr, size);
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else
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memcpy((char *)addr, buffer, size);
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start += size;
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len -= size;
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}
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done:
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if (!__blk_end_request_cur(req, err))
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req = blk_fetch_request(q);
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}
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}
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static void
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get_z2ram( void )
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{
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int i;
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for ( i = 0; i < Z2RAM_SIZE / Z2RAM_CHUNKSIZE; i++ )
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{
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if ( test_bit( i, zorro_unused_z2ram ) )
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{
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z2_count++;
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z2ram_map[z2ram_size++] = (unsigned long)ZTWO_VADDR(Z2RAM_START) +
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(i << Z2RAM_CHUNKSHIFT);
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clear_bit( i, zorro_unused_z2ram );
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}
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}
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return;
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}
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static void
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get_chipram( void )
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{
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while ( amiga_chip_avail() > ( Z2RAM_CHUNKSIZE * 4 ) )
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{
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chip_count++;
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z2ram_map[ z2ram_size ] =
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(u_long)amiga_chip_alloc( Z2RAM_CHUNKSIZE, "z2ram" );
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if ( z2ram_map[ z2ram_size ] == 0 )
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{
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break;
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}
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z2ram_size++;
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}
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return;
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}
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static int z2_open(struct block_device *bdev, fmode_t mode)
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{
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int device;
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int max_z2_map = ( Z2RAM_SIZE / Z2RAM_CHUNKSIZE ) *
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sizeof( z2ram_map[0] );
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int max_chip_map = ( amiga_chip_size / Z2RAM_CHUNKSIZE ) *
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sizeof( z2ram_map[0] );
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int rc = -ENOMEM;
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device = MINOR(bdev->bd_dev);
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mutex_lock(&z2ram_mutex);
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if ( current_device != -1 && current_device != device )
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{
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rc = -EBUSY;
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goto err_out;
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}
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if ( current_device == -1 )
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{
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z2_count = 0;
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chip_count = 0;
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list_count = 0;
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z2ram_size = 0;
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/* Use a specific list entry. */
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if (device >= Z2MINOR_MEMLIST1 && device <= Z2MINOR_MEMLIST4) {
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int index = device - Z2MINOR_MEMLIST1 + 1;
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unsigned long size, paddr, vaddr;
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if (index >= m68k_realnum_memory) {
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printk( KERN_ERR DEVICE_NAME
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": no such entry in z2ram_map\n" );
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goto err_out;
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}
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paddr = m68k_memory[index].addr;
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size = m68k_memory[index].size & ~(Z2RAM_CHUNKSIZE-1);
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#ifdef __powerpc__
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/* FIXME: ioremap doesn't build correct memory tables. */
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{
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vfree(vmalloc (size));
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}
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vaddr = (unsigned long) __ioremap (paddr, size,
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_PAGE_WRITETHRU);
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#else
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vaddr = (unsigned long)z_remap_nocache_nonser(paddr, size);
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#endif
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z2ram_map =
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kmalloc((size/Z2RAM_CHUNKSIZE)*sizeof(z2ram_map[0]),
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GFP_KERNEL);
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if ( z2ram_map == NULL )
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{
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printk( KERN_ERR DEVICE_NAME
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": cannot get mem for z2ram_map\n" );
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goto err_out;
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}
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while (size) {
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z2ram_map[ z2ram_size++ ] = vaddr;
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size -= Z2RAM_CHUNKSIZE;
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vaddr += Z2RAM_CHUNKSIZE;
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list_count++;
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}
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if ( z2ram_size != 0 )
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printk( KERN_INFO DEVICE_NAME
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": using %iK List Entry %d Memory\n",
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list_count * Z2RAM_CHUNK1024, index );
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} else
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switch ( device )
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{
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case Z2MINOR_COMBINED:
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z2ram_map = kmalloc( max_z2_map + max_chip_map, GFP_KERNEL );
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if ( z2ram_map == NULL )
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{
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printk( KERN_ERR DEVICE_NAME
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": cannot get mem for z2ram_map\n" );
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goto err_out;
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}
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get_z2ram();
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get_chipram();
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if ( z2ram_size != 0 )
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printk( KERN_INFO DEVICE_NAME
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": using %iK Zorro II RAM and %iK Chip RAM (Total %dK)\n",
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z2_count * Z2RAM_CHUNK1024,
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chip_count * Z2RAM_CHUNK1024,
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( z2_count + chip_count ) * Z2RAM_CHUNK1024 );
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break;
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case Z2MINOR_Z2ONLY:
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z2ram_map = kmalloc( max_z2_map, GFP_KERNEL );
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if ( z2ram_map == NULL )
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{
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printk( KERN_ERR DEVICE_NAME
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": cannot get mem for z2ram_map\n" );
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goto err_out;
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}
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get_z2ram();
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if ( z2ram_size != 0 )
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printk( KERN_INFO DEVICE_NAME
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": using %iK of Zorro II RAM\n",
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z2_count * Z2RAM_CHUNK1024 );
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break;
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case Z2MINOR_CHIPONLY:
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z2ram_map = kmalloc( max_chip_map, GFP_KERNEL );
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if ( z2ram_map == NULL )
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{
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printk( KERN_ERR DEVICE_NAME
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": cannot get mem for z2ram_map\n" );
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goto err_out;
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}
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get_chipram();
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if ( z2ram_size != 0 )
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printk( KERN_INFO DEVICE_NAME
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": using %iK Chip RAM\n",
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chip_count * Z2RAM_CHUNK1024 );
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break;
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default:
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rc = -ENODEV;
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goto err_out;
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break;
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}
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if ( z2ram_size == 0 )
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{
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printk( KERN_NOTICE DEVICE_NAME
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": no unused ZII/Chip RAM found\n" );
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goto err_out_kfree;
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}
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current_device = device;
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z2ram_size <<= Z2RAM_CHUNKSHIFT;
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set_capacity(z2ram_gendisk, z2ram_size >> 9);
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}
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mutex_unlock(&z2ram_mutex);
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return 0;
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err_out_kfree:
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kfree(z2ram_map);
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err_out:
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mutex_unlock(&z2ram_mutex);
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return rc;
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}
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static void
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z2_release(struct gendisk *disk, fmode_t mode)
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{
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mutex_lock(&z2ram_mutex);
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if ( current_device == -1 ) {
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mutex_unlock(&z2ram_mutex);
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return;
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}
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mutex_unlock(&z2ram_mutex);
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/*
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* FIXME: unmap memory
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*/
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}
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static const struct block_device_operations z2_fops =
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{
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.owner = THIS_MODULE,
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.open = z2_open,
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.release = z2_release,
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};
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static struct kobject *z2_find(dev_t dev, int *part, void *data)
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{
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*part = 0;
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return get_disk(z2ram_gendisk);
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}
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static struct request_queue *z2_queue;
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static int __init
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z2_init(void)
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{
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int ret;
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if (!MACH_IS_AMIGA)
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return -ENODEV;
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ret = -EBUSY;
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if (register_blkdev(Z2RAM_MAJOR, DEVICE_NAME))
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goto err;
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ret = -ENOMEM;
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z2ram_gendisk = alloc_disk(1);
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if (!z2ram_gendisk)
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goto out_disk;
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z2_queue = blk_init_queue(do_z2_request, &z2ram_lock);
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if (!z2_queue)
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goto out_queue;
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z2ram_gendisk->major = Z2RAM_MAJOR;
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z2ram_gendisk->first_minor = 0;
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z2ram_gendisk->fops = &z2_fops;
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sprintf(z2ram_gendisk->disk_name, "z2ram");
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z2ram_gendisk->queue = z2_queue;
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add_disk(z2ram_gendisk);
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blk_register_region(MKDEV(Z2RAM_MAJOR, 0), Z2MINOR_COUNT, THIS_MODULE,
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z2_find, NULL, NULL);
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return 0;
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out_queue:
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put_disk(z2ram_gendisk);
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out_disk:
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unregister_blkdev(Z2RAM_MAJOR, DEVICE_NAME);
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err:
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return ret;
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}
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static void __exit z2_exit(void)
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{
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int i, j;
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blk_unregister_region(MKDEV(Z2RAM_MAJOR, 0), Z2MINOR_COUNT);
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unregister_blkdev(Z2RAM_MAJOR, DEVICE_NAME);
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del_gendisk(z2ram_gendisk);
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put_disk(z2ram_gendisk);
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blk_cleanup_queue(z2_queue);
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if ( current_device != -1 )
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{
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i = 0;
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for ( j = 0 ; j < z2_count; j++ )
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{
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set_bit( i++, zorro_unused_z2ram );
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}
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for ( j = 0 ; j < chip_count; j++ )
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{
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if ( z2ram_map[ i ] )
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{
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amiga_chip_free( (void *) z2ram_map[ i++ ] );
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}
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}
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if ( z2ram_map != NULL )
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{
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kfree( z2ram_map );
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}
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}
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return;
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}
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module_init(z2_init);
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module_exit(z2_exit);
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MODULE_LICENSE("GPL");
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