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429 lines
9.5 KiB
429 lines
9.5 KiB
/* |
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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 ([email protected]) |
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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/blk-mq.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 <linux/pgtable.h> |
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#include <asm/setup.h> |
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#include <asm/amigahw.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 blk_status_t z2_queue_rq(struct blk_mq_hw_ctx *hctx, |
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const struct blk_mq_queue_data *bd) |
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{ |
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struct request *req = bd->rq; |
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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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blk_mq_start_request(req); |
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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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return BLK_STS_IOERR; |
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} |
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spin_lock_irq(&z2ram_lock); |
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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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spin_unlock_irq(&z2ram_lock); |
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blk_mq_end_request(req, BLK_STS_OK); |
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return BLK_STS_OK; |
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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_wt(paddr, size); |
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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_array(size / Z2RAM_CHUNKSIZE, |
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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_and_module(z2ram_gendisk); |
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} |
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static struct request_queue *z2_queue; |
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static struct blk_mq_tag_set tag_set; |
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static const struct blk_mq_ops z2_mq_ops = { |
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.queue_rq = z2_queue_rq, |
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}; |
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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_mq_init_sq_queue(&tag_set, &z2_mq_ops, 16, |
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BLK_MQ_F_SHOULD_MERGE); |
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if (IS_ERR(z2_queue)) { |
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ret = PTR_ERR(z2_queue); |
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z2_queue = NULL; |
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goto out_queue; |
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} |
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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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blk_mq_free_tag_set(&tag_set); |
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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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