[linux-block.git] / 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/blk-mq.h>
#include <linux/bitops.h>
#include <linux/mutex.h>
#include <linux/slab.h>
#include <linux/pgtable.h>

#include <asm/setup.h>
#include <asm/amigahw.h>

#include <linux/zorro.h>

#define Z2MINOR_COMBINED      (0)
#define Z2MINOR_Z2ONLY        (1)
#define Z2MINOR_CHIPONLY      (2)
#define Z2MINOR_MEMLIST1      (4)
#define Z2MINOR_MEMLIST2      (5)
#define Z2MINOR_MEMLIST3      (6)
#define Z2MINOR_MEMLIST4      (7)
#define Z2MINOR_COUNT         (8)	/* Move this down when adding a new minor */

#define Z2RAM_CHUNK1024       ( Z2RAM_CHUNKSIZE >> 10 )

static DEFINE_MUTEX(z2ram_mutex);
static u_long *z2ram_map = NULL;
static u_long z2ram_size = 0;
static int z2_count = 0;
static int chip_count = 0;
static int list_count = 0;
static int current_device = -1;

static DEFINE_SPINLOCK(z2ram_lock);

static struct gendisk *z2ram_gendisk[Z2MINOR_COUNT];

static blk_status_t z2_queue_rq(struct blk_mq_hw_ctx *hctx,
				const struct blk_mq_queue_data *bd)
{
	struct request *req = bd->rq;
	unsigned long start = blk_rq_pos(req) << 9;
	unsigned long len = blk_rq_cur_bytes(req);

	blk_mq_start_request(req);

	if (start + len > z2ram_size) {
		pr_err(DEVICE_NAME ": bad access: block=%llu, "
		       "count=%u\n",
		       (unsigned long long)blk_rq_pos(req),
		       blk_rq_cur_sectors(req));
		return BLK_STS_IOERR;
	}

	spin_lock_irq(&z2ram_lock);

	while (len) {
		unsigned long addr = start & Z2RAM_CHUNKMASK;
		unsigned long size = Z2RAM_CHUNKSIZE - addr;
		void *buffer = bio_data(req->bio);

		if (len < size)
			size = len;
		addr += z2ram_map[start >> Z2RAM_CHUNKSHIFT];
		if (rq_data_dir(req) == READ)
			memcpy(buffer, (char *)addr, size);
		else
			memcpy((char *)addr, buffer, size);
		start += size;
		len -= size;
	}

	spin_unlock_irq(&z2ram_lock);
	blk_mq_end_request(req, BLK_STS_OK);
	return BLK_STS_OK;
}

static void get_z2ram(void)
{
	int i;

	for (i = 0; i < Z2RAM_SIZE / Z2RAM_CHUNKSIZE; i++) {
		if (test_bit(i, zorro_unused_z2ram)) {
			z2_count++;
			z2ram_map[z2ram_size++] =
			    (unsigned long)ZTWO_VADDR(Z2RAM_START) +
			    (i << Z2RAM_CHUNKSHIFT);
			clear_bit(i, zorro_unused_z2ram);
		}
	}

	return;
}

static void get_chipram(void)
{

	while (amiga_chip_avail() > (Z2RAM_CHUNKSIZE * 4)) {
		chip_count++;
		z2ram_map[z2ram_size] =
		    (u_long) amiga_chip_alloc(Z2RAM_CHUNKSIZE, "z2ram");

		if (z2ram_map[z2ram_size] == 0) {
			break;
		}

		z2ram_size++;
	}

	return;
}

static int z2_open(struct gendisk *disk, blk_mode_t mode)
{
	int device = disk->first_minor;
	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;

	mutex_lock(&z2ram_mutex);
	if (current_device != -1 && current_device != device) {
		rc = -EBUSY;
		goto err_out;
	}

	if (current_device == -1) {
		z2_count = 0;
		chip_count = 0;
		list_count = 0;
		z2ram_size = 0;

		/* Use a specific list entry. */
		if (device >= Z2MINOR_MEMLIST1 && device <= Z2MINOR_MEMLIST4) {
			int index = device - Z2MINOR_MEMLIST1 + 1;
			unsigned long size, paddr, vaddr;

			if (index >= m68k_realnum_memory) {
				printk(KERN_ERR DEVICE_NAME
				       ": no such entry in z2ram_map\n");
				goto err_out;
			}

			paddr = m68k_memory[index].addr;
			size = m68k_memory[index].size & ~(Z2RAM_CHUNKSIZE - 1);

#ifdef __powerpc__
			/* FIXME: ioremap doesn't build correct memory tables. */
			{
				vfree(vmalloc(size));
			}

			vaddr = (unsigned long)ioremap_wt(paddr, size);

#else
			vaddr =
			    (unsigned long)z_remap_nocache_nonser(paddr, size);
#endif
			z2ram_map =
			    kmalloc_array(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)
					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)
					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[device], z2ram_size >> 9);
	}

	mutex_unlock(&z2ram_mutex);
	return 0;

err_out_kfree:
	kfree(z2ram_map);
err_out:
	mutex_unlock(&z2ram_mutex);
	return rc;
}

static void z2_release(struct gendisk *disk)
{
	mutex_lock(&z2ram_mutex);
	if (current_device == -1) {
		mutex_unlock(&z2ram_mutex);
		return;
	}
	mutex_unlock(&z2ram_mutex);
	/*
	 * FIXME: unmap memory
	 */
}

static const struct block_device_operations z2_fops = {
	.owner = THIS_MODULE,
	.open = z2_open,
	.release = z2_release,
};

static struct blk_mq_tag_set tag_set;

static const struct blk_mq_ops z2_mq_ops = {
	.queue_rq = z2_queue_rq,
};

static int z2ram_register_disk(int minor)
{
	struct gendisk *disk;
	int err;

	disk = blk_mq_alloc_disk(&tag_set, NULL);
	if (IS_ERR(disk))
		return PTR_ERR(disk);

	disk->major = Z2RAM_MAJOR;
	disk->first_minor = minor;
	disk->minors = 1;
	disk->flags |= GENHD_FL_NO_PART;
	disk->fops = &z2_fops;
	if (minor)
		sprintf(disk->disk_name, "z2ram%d", minor);
	else
		sprintf(disk->disk_name, "z2ram");

	z2ram_gendisk[minor] = disk;
	err = add_disk(disk);
	if (err)
		put_disk(disk);
	return err;
}

static int __init z2_init(void)
{
	int ret, i;

	if (!MACH_IS_AMIGA)
		return -ENODEV;

	if (register_blkdev(Z2RAM_MAJOR, DEVICE_NAME))
		return -EBUSY;

	tag_set.ops = &z2_mq_ops;
	tag_set.nr_hw_queues = 1;
	tag_set.nr_maps = 1;
	tag_set.queue_depth = 16;
	tag_set.numa_node = NUMA_NO_NODE;
	tag_set.flags = BLK_MQ_F_SHOULD_MERGE;
	ret = blk_mq_alloc_tag_set(&tag_set);
	if (ret)
		goto out_unregister_blkdev;

	for (i = 0; i < Z2MINOR_COUNT; i++) {
		ret = z2ram_register_disk(i);
		if (ret && i == 0)
			goto out_free_tagset;
	}

	return 0;

out_free_tagset:
	blk_mq_free_tag_set(&tag_set);
out_unregister_blkdev:
	unregister_blkdev(Z2RAM_MAJOR, DEVICE_NAME);
	return ret;
}

static void __exit z2_exit(void)
{
	int i, j;

	unregister_blkdev(Z2RAM_MAJOR, DEVICE_NAME);

	for (i = 0; i < Z2MINOR_COUNT; i++) {
		del_gendisk(z2ram_gendisk[i]);
		put_disk(z2ram_gendisk[i]);
	}
	blk_mq_free_tag_set(&tag_set);

	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");
Commit	Line	Data
1da177e4 LT	1	/*
	2	** z2ram - Amiga pseudo-driver to access 16bit-RAM in ZorroII space
	3	** as a block device, to be used as a RAM disk or swap space
	4	**
	5	** Copyright (C) 1994 by Ingo Wilken (Ingo.Wilken@informatik.uni-oldenburg.de)
	6	**
	7	** ++Geert: support for zorro_unused_z2ram, better range checking
	8	** ++roman: translate accesses via an array
	9	** ++Milan: support for ChipRAM usage
	10	** ++yambo: converted to 2.0 kernel
	11	** ++yambo: modularized and support added for 3 minor devices including:
	12	** MAJOR MINOR DESCRIPTION
	13	** ----- ----- ----------------------------------------------
	14	** 37 0 Use Zorro II and Chip ram
	15	** 37 1 Use only Zorro II ram
	16	** 37 2 Use only Chip ram
	17	** 37 4-7 Use memory list entry 1-4 (first is 0)
	18	** ++jskov: support for 1-4th memory list entry.
	19	**
	20	** Permission to use, copy, modify, and distribute this software and its
	21	** documentation for any purpose and without fee is hereby granted, provided
	22	** that the above copyright notice appear in all copies and that both that
	23	** copyright notice and this permission notice appear in supporting
	24	** documentation. This software is provided "as is" without express or
	25	** implied warranty.
	26	*/
	27
	28	#define DEVICE_NAME "Z2RAM"
	29
	30	#include <linux/major.h>
	31	#include <linux/vmalloc.h>
	32	#include <linux/init.h>
	33	#include <linux/module.h>
8535fd6f	34	#include <linux/blk-mq.h>
1da177e4	35	#include <linux/bitops.h>
2a48fc0a	36	#include <linux/mutex.h>
5a0e3ad6	37	#include <linux/slab.h>
65fddcfc	38	#include <linux/pgtable.h>
1da177e4 LT	39
	40	#include <asm/setup.h>
	41	#include <asm/amigahw.h>
1da177e4 LT	42
	43	#include <linux/zorro.h>
	44
1da177e4 LT	45	#define Z2MINOR_COMBINED (0)
	46	#define Z2MINOR_Z2ONLY (1)
	47	#define Z2MINOR_CHIPONLY (2)
	48	#define Z2MINOR_MEMLIST1 (4)
	49	#define Z2MINOR_MEMLIST2 (5)
	50	#define Z2MINOR_MEMLIST3 (6)
	51	#define Z2MINOR_MEMLIST4 (7)
6c3a05e1	52	#define Z2MINOR_COUNT (8) /* Move this down when adding a new minor */
1da177e4 LT	53
	54	#define Z2RAM_CHUNK1024 ( Z2RAM_CHUNKSIZE >> 10 )
	55
2a48fc0a	56	static DEFINE_MUTEX(z2ram_mutex);
6c3a05e1 CH	57	static u_long *z2ram_map = NULL;
	58	static u_long z2ram_size = 0;
	59	static int z2_count = 0;
	60	static int chip_count = 0;
	61	static int list_count = 0;
	62	static int current_device = -1;
1da177e4 LT	63
	64	static DEFINE_SPINLOCK(z2ram_lock);
	65
76487f02	66	static struct gendisk *z2ram_gendisk[Z2MINOR_COUNT];
1da177e4	67
8535fd6f JA	68	static blk_status_t z2_queue_rq(struct blk_mq_hw_ctx *hctx,
8535fd6f JA	69	const struct blk_mq_queue_data *bd)
1da177e4	70	{
8535fd6f JA	71	struct request *req = bd->rq;
8535fd6f JA	72	unsigned long start = blk_rq_pos(req) << 9;
6c3a05e1	73	unsigned long len = blk_rq_cur_bytes(req);
8535fd6f JA	74
	75	blk_mq_start_request(req);
	76
	77	if (start + len > z2ram_size) {
	78	pr_err(DEVICE_NAME ": bad access: block=%llu, "
	79	"count=%u\n",
	80	(unsigned long long)blk_rq_pos(req),
	81	blk_rq_cur_sectors(req));
	82	return BLK_STS_IOERR;
	83	}
	84
	85	spin_lock_irq(&z2ram_lock);
	86
	87	while (len) {
	88	unsigned long addr = start & Z2RAM_CHUNKMASK;
	89	unsigned long size = Z2RAM_CHUNKSIZE - addr;
	90	void *buffer = bio_data(req->bio);
	91
	92	if (len < size)
	93	size = len;
6c3a05e1	94	addr += z2ram_map[start >> Z2RAM_CHUNKSHIFT];
8535fd6f JA	95	if (rq_data_dir(req) == READ)
	96	memcpy(buffer, (char *)addr, size);
	97	else
	98	memcpy((char *)addr, buffer, size);
	99	start += size;
	100	len -= size;
1da177e4	101	}
8535fd6f JA	102
	103	spin_unlock_irq(&z2ram_lock);
	104	blk_mq_end_request(req, BLK_STS_OK);
	105	return BLK_STS_OK;
1da177e4 LT	106	}
1da177e4 LT	107
6c3a05e1	108	static void get_z2ram(void)
1da177e4	109	{
6c3a05e1 CH	110	int i;
	111
	112	for (i = 0; i < Z2RAM_SIZE / Z2RAM_CHUNKSIZE; i++) {
	113	if (test_bit(i, zorro_unused_z2ram)) {
	114	z2_count++;
	115	z2ram_map[z2ram_size++] =
	116	(unsigned long)ZTWO_VADDR(Z2RAM_START) +
	117	(i << Z2RAM_CHUNKSHIFT);
	118	clear_bit(i, zorro_unused_z2ram);
	119	}
1da177e4	120	}
1da177e4	121
6c3a05e1	122	return;
1da177e4 LT	123	}
1da177e4 LT	124
6c3a05e1	125	static void get_chipram(void)
1da177e4 LT	126	{
1da177e4 LT	127
6c3a05e1 CH	128	while (amiga_chip_avail() > (Z2RAM_CHUNKSIZE * 4)) {
	129	chip_count++;
	130	z2ram_map[z2ram_size] =
	131	(u_long) amiga_chip_alloc(Z2RAM_CHUNKSIZE, "z2ram");
1da177e4	132
6c3a05e1 CH	133	if (z2ram_map[z2ram_size] == 0) {
	134	break;
	135	}
	136
	137	z2ram_size++;
1da177e4 LT	138	}
1da177e4 LT	139
6c3a05e1	140	return;
1da177e4 LT	141	}
1da177e4 LT	142
05bdb996	143	static int z2_open(struct gendisk *disk, blk_mode_t mode)
1da177e4	144	{
d32e2bf8	145	int device = disk->first_minor;
6c3a05e1 CH	146	int max_z2_map = (Z2RAM_SIZE / Z2RAM_CHUNKSIZE) * sizeof(z2ram_map[0]);
	147	int max_chip_map = (amiga_chip_size / Z2RAM_CHUNKSIZE) *
	148	sizeof(z2ram_map[0]);
	149	int rc = -ENOMEM;
1da177e4	150
6c3a05e1 CH	151	mutex_lock(&z2ram_mutex);
	152	if (current_device != -1 && current_device != device) {
	153	rc = -EBUSY;
	154	goto err_out;
	155	}
1da177e4	156
6c3a05e1 CH	157	if (current_device == -1) {
	158	z2_count = 0;
	159	chip_count = 0;
	160	list_count = 0;
	161	z2ram_size = 0;
1da177e4	162
6c3a05e1 CH	163	/* Use a specific list entry. */
	164	if (device >= Z2MINOR_MEMLIST1 && device <= Z2MINOR_MEMLIST4) {
	165	int index = device - Z2MINOR_MEMLIST1 + 1;
	166	unsigned long size, paddr, vaddr;
1da177e4	167
6c3a05e1 CH	168	if (index >= m68k_realnum_memory) {
	169	printk(KERN_ERR DEVICE_NAME
	170	": no such entry in z2ram_map\n");
	171	goto err_out;
	172	}
1da177e4	173
6c3a05e1 CH	174	paddr = m68k_memory[index].addr;
6c3a05e1 CH	175	size = m68k_memory[index].size & ~(Z2RAM_CHUNKSIZE - 1);
1da177e4	176
6c3a05e1 CH	177	#ifdef __powerpc__
	178	/* FIXME: ioremap doesn't build correct memory tables. */
	179	{
	180	vfree(vmalloc(size));
	181	}
1da177e4	182
6c3a05e1	183	vaddr = (unsigned long)ioremap_wt(paddr, size);
1da177e4	184
6c3a05e1 CH	185	#else
	186	vaddr =
	187	(unsigned long)z_remap_nocache_nonser(paddr, size);
	188	#endif
	189	z2ram_map =
	190	kmalloc_array(size / Z2RAM_CHUNKSIZE,
	191	sizeof(z2ram_map[0]), GFP_KERNEL);
	192	if (z2ram_map == NULL) {
	193	printk(KERN_ERR DEVICE_NAME
	194	": cannot get mem for z2ram_map\n");
	195	goto err_out;
	196	}
	197
	198	while (size) {
	199	z2ram_map[z2ram_size++] = vaddr;
	200	size -= Z2RAM_CHUNKSIZE;
	201	vaddr += Z2RAM_CHUNKSIZE;
	202	list_count++;
	203	}
	204
	205	if (z2ram_size != 0)
	206	printk(KERN_INFO DEVICE_NAME
	207	": using %iK List Entry %d Memory\n",
	208	list_count * Z2RAM_CHUNK1024, index);
	209	} else
	210	switch (device) {
	211	case Z2MINOR_COMBINED:
	212
	213	z2ram_map =
	214	kmalloc(max_z2_map + max_chip_map,
	215	GFP_KERNEL);
	216	if (z2ram_map == NULL) {
	217	printk(KERN_ERR DEVICE_NAME
	218	": cannot get mem for z2ram_map\n");
	219	goto err_out;
	220	}
	221
	222	get_z2ram();
	223	get_chipram();
	224
	225	if (z2ram_size != 0)
	226	printk(KERN_INFO DEVICE_NAME
	227	": using %iK Zorro II RAM and %iK Chip RAM (Total %dK)\n",
	228	z2_count * Z2RAM_CHUNK1024,
	229	chip_count * Z2RAM_CHUNK1024,
	230	(z2_count +
	231	chip_count) * Z2RAM_CHUNK1024);
	232
	233	break;
	234
	235	case Z2MINOR_Z2ONLY:
	236	z2ram_map = kmalloc(max_z2_map, GFP_KERNEL);
ec1e7e88	237	if (!z2ram_map)
6c3a05e1	238	goto err_out;
6c3a05e1 CH	239
	240	get_z2ram();
	241
	242	if (z2ram_size != 0)
	243	printk(KERN_INFO DEVICE_NAME
	244	": using %iK of Zorro II RAM\n",
	245	z2_count * Z2RAM_CHUNK1024);
	246
	247	break;
	248
	249	case Z2MINOR_CHIPONLY:
	250	z2ram_map = kmalloc(max_chip_map, GFP_KERNEL);
ec1e7e88	251	if (!z2ram_map)
6c3a05e1	252	goto err_out;
6c3a05e1 CH	253
	254	get_chipram();
	255
	256	if (z2ram_size != 0)
	257	printk(KERN_INFO DEVICE_NAME
	258	": using %iK Chip RAM\n",
	259	chip_count * Z2RAM_CHUNK1024);
	260
	261	break;
	262
	263	default:
	264	rc = -ENODEV;
	265	goto err_out;
	266
	267	break;
	268	}
	269
	270	if (z2ram_size == 0) {
	271	printk(KERN_NOTICE DEVICE_NAME
	272	": no unused ZII/Chip RAM found\n");
	273	goto err_out_kfree;
1da177e4 LT	274	}
1da177e4 LT	275
6c3a05e1 CH	276	current_device = device;
6c3a05e1 CH	277	z2ram_size <<= Z2RAM_CHUNKSHIFT;
76487f02	278	set_capacity(z2ram_gendisk[device], z2ram_size >> 9);
1da177e4 LT	279	}
1da177e4 LT	280
6c3a05e1 CH	281	mutex_unlock(&z2ram_mutex);
6c3a05e1 CH	282	return 0;
1da177e4 LT	283
1da177e4 LT	284	err_out_kfree:
6c3a05e1	285	kfree(z2ram_map);
1da177e4	286	err_out:
6c3a05e1 CH	287	mutex_unlock(&z2ram_mutex);
6c3a05e1 CH	288	return rc;
1da177e4 LT	289	}
1da177e4 LT	290
ae220766	291	static void z2_release(struct gendisk *disk)
1da177e4	292	{
6c3a05e1 CH	293	mutex_lock(&z2ram_mutex);
	294	if (current_device == -1) {
	295	mutex_unlock(&z2ram_mutex);
	296	return;
	297	}
	298	mutex_unlock(&z2ram_mutex);
	299	/*
	300	* FIXME: unmap memory
	301	*/
1da177e4 LT	302	}
1da177e4 LT	303
6c3a05e1 CH	304	static const struct block_device_operations z2_fops = {
	305	.owner = THIS_MODULE,
	306	.open = z2_open,
	307	.release = z2_release,
1da177e4 LT	308	};
1da177e4 LT	309
8535fd6f JA	310	static struct blk_mq_tag_set tag_set;
	311
	312	static const struct blk_mq_ops z2_mq_ops = {
6c3a05e1	313	.queue_rq = z2_queue_rq,
8535fd6f	314	};
1da177e4	315
76487f02 CH	316	static int z2ram_register_disk(int minor)
76487f02 CH	317	{
76487f02	318	struct gendisk *disk;
15733754	319	int err;
76487f02	320
ec06c989 CH	321	disk = blk_mq_alloc_disk(&tag_set, NULL);
	322	if (IS_ERR(disk))
	323	return PTR_ERR(disk);
76487f02 CH	324
	325	disk->major = Z2RAM_MAJOR;
	326	disk->first_minor = minor;
ec06c989	327	disk->minors = 1;
1ebe2e5f	328	disk->flags \|= GENHD_FL_NO_PART;
76487f02 CH	329	disk->fops = &z2_fops;
	330	if (minor)
	331	sprintf(disk->disk_name, "z2ram%d", minor);
	332	else
	333	sprintf(disk->disk_name, "z2ram");
76487f02 CH	334
76487f02 CH	335	z2ram_gendisk[minor] = disk;
15733754 LC	336	err = add_disk(disk);
15733754 LC	337	if (err)
8b9ab626	338	put_disk(disk);
15733754	339	return err;
76487f02 CH	340	}
76487f02 CH	341
6c3a05e1	342	static int __init z2_init(void)
1da177e4	343	{
76487f02	344	int ret, i;
1da177e4	345
6c3a05e1 CH	346	if (!MACH_IS_AMIGA)
6c3a05e1 CH	347	return -ENODEV;
1da177e4	348
6c3a05e1	349	if (register_blkdev(Z2RAM_MAJOR, DEVICE_NAME))
76487f02 CH	350	return -EBUSY;
	351
	352	tag_set.ops = &z2_mq_ops;
	353	tag_set.nr_hw_queues = 1;
	354	tag_set.nr_maps = 1;
	355	tag_set.queue_depth = 16;
	356	tag_set.numa_node = NUMA_NO_NODE;
	357	tag_set.flags = BLK_MQ_F_SHOULD_MERGE;
	358	ret = blk_mq_alloc_tag_set(&tag_set);
	359	if (ret)
	360	goto out_unregister_blkdev;
	361
	362	for (i = 0; i < Z2MINOR_COUNT; i++) {
	363	ret = z2ram_register_disk(i);
	364	if (ret && i == 0)
	365	goto out_free_tagset;
6c3a05e1	366	}
1da177e4	367
6c3a05e1	368	return 0;
1da177e4	369
76487f02 CH	370	out_free_tagset:
	371	blk_mq_free_tag_set(&tag_set);
	372	out_unregister_blkdev:
6c3a05e1	373	unregister_blkdev(Z2RAM_MAJOR, DEVICE_NAME);
6c3a05e1	374	return ret;
1da177e4 LT	375	}
1da177e4 LT	376
f39d88ad	377	static void __exit z2_exit(void)
1da177e4	378	{
6c3a05e1	379	int i, j;
76487f02	380
6c3a05e1	381	unregister_blkdev(Z2RAM_MAJOR, DEVICE_NAME);
76487f02 CH	382
	383	for (i = 0; i < Z2MINOR_COUNT; i++) {
	384	del_gendisk(z2ram_gendisk[i]);
76487f02 CH	385	put_disk(z2ram_gendisk[i]);
76487f02 CH	386	}
6c3a05e1 CH	387	blk_mq_free_tag_set(&tag_set);
	388
	389	if (current_device != -1) {
	390	i = 0;
	391
	392	for (j = 0; j < z2_count; j++) {
	393	set_bit(i++, zorro_unused_z2ram);
	394	}
1da177e4	395
6c3a05e1 CH	396	for (j = 0; j < chip_count; j++) {
	397	if (z2ram_map[i]) {
	398	amiga_chip_free((void *)z2ram_map[i++]);
	399	}
	400	}
1da177e4	401
6c3a05e1 CH	402	if (z2ram_map != NULL) {
	403	kfree(z2ram_map);
	404	}
1da177e4	405	}
1da177e4	406
6c3a05e1 CH	407	return;
6c3a05e1 CH	408	}
f39d88ad AV	409
	410	module_init(z2_init);
	411	module_exit(z2_exit);
	412	MODULE_LICENSE("GPL");