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[tomato.git] / release / src-rt-6.x.4708 / linux / linux-2.6.36 / drivers / block / z2ram.c

/*
** 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/smp_lock.h>
#include <linux/slab.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 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) {
                        printk( KERN_ERR DEVICE_NAME ": bad access: block=%lu, count=%u\n",
                                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;
                        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;
                }
        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++ ] = 
                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);

    lock_kernel();
    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__
                {
                        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);
    }

    unlock_kernel();
    return 0;

err_out_kfree:
    kfree(z2ram_map);
err_out:
    unlock_kernel();
    return rc;
}

static int
z2_release(struct gendisk *disk, fmode_t mode)
{
    lock_kernel();
    if ( current_device == -1 ) {
        unlock_kernel();
        return 0;
    }
    unlock_kernel();

    return 0;
}

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");