425 lines
9.4 KiB
C
425 lines
9.4 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/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[Z2MINOR_COUNT];
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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 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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if (test_bit(i, zorro_unused_z2ram)) {
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z2_count++;
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z2ram_map[z2ram_size++] =
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(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 get_chipram(void)
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{
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while (amiga_chip_avail() > (Z2RAM_CHUNKSIZE * 4)) {
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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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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) * 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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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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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 =
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(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]), GFP_KERNEL);
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if (z2ram_map == NULL) {
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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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case Z2MINOR_COMBINED:
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z2ram_map =
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kmalloc(max_z2_map + max_chip_map,
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GFP_KERNEL);
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if (z2ram_map == NULL) {
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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 +
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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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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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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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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[device], 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 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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.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 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 z2ram_register_disk(int minor)
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{
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struct request_queue *q;
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struct gendisk *disk;
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disk = alloc_disk(1);
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if (!disk)
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return -ENOMEM;
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q = blk_mq_init_queue(&tag_set);
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if (IS_ERR(q)) {
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put_disk(disk);
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return PTR_ERR(q);
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}
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disk->major = Z2RAM_MAJOR;
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disk->first_minor = minor;
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disk->fops = &z2_fops;
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if (minor)
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sprintf(disk->disk_name, "z2ram%d", minor);
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else
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sprintf(disk->disk_name, "z2ram");
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disk->queue = q;
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z2ram_gendisk[minor] = disk;
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add_disk(disk);
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return 0;
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}
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static int __init z2_init(void)
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{
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int ret, i;
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if (!MACH_IS_AMIGA)
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return -ENODEV;
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if (register_blkdev(Z2RAM_MAJOR, DEVICE_NAME))
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return -EBUSY;
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tag_set.ops = &z2_mq_ops;
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tag_set.nr_hw_queues = 1;
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tag_set.nr_maps = 1;
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tag_set.queue_depth = 16;
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tag_set.numa_node = NUMA_NO_NODE;
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tag_set.flags = BLK_MQ_F_SHOULD_MERGE;
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ret = blk_mq_alloc_tag_set(&tag_set);
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if (ret)
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goto out_unregister_blkdev;
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for (i = 0; i < Z2MINOR_COUNT; i++) {
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ret = z2ram_register_disk(i);
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if (ret && i == 0)
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goto out_free_tagset;
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}
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return 0;
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out_free_tagset:
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blk_mq_free_tag_set(&tag_set);
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out_unregister_blkdev:
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unregister_blkdev(Z2RAM_MAJOR, DEVICE_NAME);
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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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unregister_blkdev(Z2RAM_MAJOR, DEVICE_NAME);
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for (i = 0; i < Z2MINOR_COUNT; i++) {
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del_gendisk(z2ram_gendisk[i]);
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blk_cleanup_queue(z2ram_gendisk[i]->queue);
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put_disk(z2ram_gendisk[i]);
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}
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blk_mq_free_tag_set(&tag_set);
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if (current_device != -1) {
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i = 0;
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for (j = 0; j < z2_count; j++) {
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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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if (z2ram_map[i]) {
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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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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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