[linux-2.6-block.git] / arch / m68k / emu / nfblock.c

/*
 * ARAnyM block device driver
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file COPYING in the main directory of this archive
 * for more details.
 */

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>

#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/genhd.h>
#include <linux/blkdev.h>
#include <linux/hdreg.h>
#include <linux/slab.h>

#include <asm/natfeat.h>

static long nfhd_id;

enum {
	/* emulation entry points */
	NFHD_READ_WRITE = 10,
	NFHD_GET_CAPACITY = 14,

	/* skip ACSI devices */
	NFHD_DEV_OFFSET = 8,
};

static inline s32 nfhd_read_write(u32 major, u32 minor, u32 rwflag, u32 recno,
				  u32 count, u32 buf)
{
	return nf_call(nfhd_id + NFHD_READ_WRITE, major, minor, rwflag, recno,
		       count, buf);
}

static inline s32 nfhd_get_capacity(u32 major, u32 minor, u32 *blocks,
				    u32 *blocksize)
{
	return nf_call(nfhd_id + NFHD_GET_CAPACITY, major, minor,
		       virt_to_phys(blocks), virt_to_phys(blocksize));
}

static LIST_HEAD(nfhd_list);

static int major_num;
module_param(major_num, int, 0);

struct nfhd_device {
	struct list_head list;
	int id;
	u32 blocks, bsize;
	int bshift;
	struct request_queue *queue;
	struct gendisk *disk;
};

static void nfhd_make_request(struct request_queue *queue, struct bio *bio)
{
	struct nfhd_device *dev = queue->queuedata;
	struct bio_vec bvec;
	struct bvec_iter iter;
	int dir, len, shift;
	sector_t sec = bio->bi_iter.bi_sector;

	dir = bio_data_dir(bio);
	shift = dev->bshift;
	bio_for_each_segment(bvec, bio, iter) {
		len = bvec.bv_len;
		len >>= 9;
		nfhd_read_write(dev->id, 0, dir, sec >> shift, len >> shift,
				bvec_to_phys(&bvec));
		sec += len;
	}
	bio_endio(bio, 0);
}

static int nfhd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
{
	struct nfhd_device *dev = bdev->bd_disk->private_data;

	geo->cylinders = dev->blocks >> (6 - dev->bshift);
	geo->heads = 4;
	geo->sectors = 16;

	return 0;
}

static const struct block_device_operations nfhd_ops = {
	.owner	= THIS_MODULE,
	.getgeo	= nfhd_getgeo,
};

static int __init nfhd_init_one(int id, u32 blocks, u32 bsize)
{
	struct nfhd_device *dev;
	int dev_id = id - NFHD_DEV_OFFSET;

	pr_info("nfhd%u: found device with %u blocks (%u bytes)\n", dev_id,
		blocks, bsize);

	if (bsize < 512 || (bsize & (bsize - 1))) {
		pr_warn("nfhd%u: invalid block size\n", dev_id);
		return -EINVAL;
	}

	dev = kmalloc(sizeof(struct nfhd_device), GFP_KERNEL);
	if (!dev)
		goto out;

	dev->id = id;
	dev->blocks = blocks;
	dev->bsize = bsize;
	dev->bshift = ffs(bsize) - 10;

	dev->queue = blk_alloc_queue(GFP_KERNEL);
	if (dev->queue == NULL)
		goto free_dev;

	dev->queue->queuedata = dev;
	blk_queue_make_request(dev->queue, nfhd_make_request);
	blk_queue_logical_block_size(dev->queue, bsize);

	dev->disk = alloc_disk(16);
	if (!dev->disk)
		goto free_queue;

	dev->disk->major = major_num;
	dev->disk->first_minor = dev_id * 16;
	dev->disk->fops = &nfhd_ops;
	dev->disk->private_data = dev;
	sprintf(dev->disk->disk_name, "nfhd%u", dev_id);
	set_capacity(dev->disk, (sector_t)blocks * (bsize / 512));
	dev->disk->queue = dev->queue;

	add_disk(dev->disk);

	list_add_tail(&dev->list, &nfhd_list);

	return 0;

free_queue:
	blk_cleanup_queue(dev->queue);
free_dev:
	kfree(dev);
out:
	return -ENOMEM;
}

static int __init nfhd_init(void)
{
	u32 blocks, bsize;
	int i;

	nfhd_id = nf_get_id("XHDI");
	if (!nfhd_id)
		return -ENODEV;

	major_num = register_blkdev(major_num, "nfhd");
	if (major_num <= 0) {
		pr_warn("nfhd: unable to get major number\n");
		return major_num;
	}

	for (i = NFHD_DEV_OFFSET; i < 24; i++) {
		if (nfhd_get_capacity(i, 0, &blocks, &bsize))
			continue;
		nfhd_init_one(i, blocks, bsize);
	}

	return 0;
}

static void __exit nfhd_exit(void)
{
	struct nfhd_device *dev, *next;

	list_for_each_entry_safe(dev, next, &nfhd_list, list) {
		list_del(&dev->list);
		del_gendisk(dev->disk);
		put_disk(dev->disk);
		blk_cleanup_queue(dev->queue);
		kfree(dev);
	}
	unregister_blkdev(major_num, "nfhd");
}

module_init(nfhd_init);
module_exit(nfhd_exit);

MODULE_LICENSE("GPL");
Commit	Line	Data
b2edd2fd RZ	1	/*
	2	* ARAnyM block device driver
	3	*
	4	* This file is subject to the terms and conditions of the GNU General Public
	5	* License. See the file COPYING in the main directory of this archive
	6	* for more details.
	7	*/
	8
	9	#include <linux/module.h>
	10	#include <linux/moduleparam.h>
	11	#include <linux/init.h>
	12
	13	#include <linux/kernel.h>
	14	#include <linux/errno.h>
	15	#include <linux/types.h>
	16	#include <linux/genhd.h>
	17	#include <linux/blkdev.h>
	18	#include <linux/hdreg.h>
	19	#include <linux/slab.h>
	20
	21	#include <asm/natfeat.h>
	22
	23	static long nfhd_id;
	24
	25	enum {
	26	/* emulation entry points */
	27	NFHD_READ_WRITE = 10,
	28	NFHD_GET_CAPACITY = 14,
	29
	30	/* skip ACSI devices */
	31	NFHD_DEV_OFFSET = 8,
	32	};
	33
	34	static inline s32 nfhd_read_write(u32 major, u32 minor, u32 rwflag, u32 recno,
	35	u32 count, u32 buf)
	36	{
	37	return nf_call(nfhd_id + NFHD_READ_WRITE, major, minor, rwflag, recno,
	38	count, buf);
	39	}
	40
	41	static inline s32 nfhd_get_capacity(u32 major, u32 minor, u32 *blocks,
	42	u32 *blocksize)
	43	{
55490050 GU	44	return nf_call(nfhd_id + NFHD_GET_CAPACITY, major, minor,
55490050 GU	45	virt_to_phys(blocks), virt_to_phys(blocksize));
b2edd2fd RZ	46	}
	47
	48	static LIST_HEAD(nfhd_list);
	49
	50	static int major_num;
	51	module_param(major_num, int, 0);
	52
	53	struct nfhd_device {
	54	struct list_head list;
	55	int id;
	56	u32 blocks, bsize;
	57	int bshift;
	58	struct request_queue *queue;
	59	struct gendisk *disk;
	60	};
	61
5a7bbad2	62	static void nfhd_make_request(struct request_queue queue, struct bio bio)
b2edd2fd RZ	63	{
b2edd2fd RZ	64	struct nfhd_device *dev = queue->queuedata;
7988613b KO	65	struct bio_vec bvec;
	66	struct bvec_iter iter;
	67	int dir, len, shift;
4f024f37	68	sector_t sec = bio->bi_iter.bi_sector;
b2edd2fd RZ	69
	70	dir = bio_data_dir(bio);
	71	shift = dev->bshift;
7988613b KO	72	bio_for_each_segment(bvec, bio, iter) {
7988613b KO	73	len = bvec.bv_len;
b2edd2fd RZ	74	len >>= 9;
b2edd2fd RZ	75	nfhd_read_write(dev->id, 0, dir, sec >> shift, len >> shift,
7988613b	76	bvec_to_phys(&bvec));
b2edd2fd RZ	77	sec += len;
	78	}
	79	bio_endio(bio, 0);
b2edd2fd RZ	80	}
	81
	82	static int nfhd_getgeo(struct block_device bdev, struct hd_geometry geo)
	83	{
	84	struct nfhd_device *dev = bdev->bd_disk->private_data;
	85
	86	geo->cylinders = dev->blocks >> (6 - dev->bshift);
	87	geo->heads = 4;
	88	geo->sectors = 16;
	89
	90	return 0;
	91	}
	92
	93	static const struct block_device_operations nfhd_ops = {
	94	.owner = THIS_MODULE,
	95	.getgeo = nfhd_getgeo,
	96	};
	97
	98	static int __init nfhd_init_one(int id, u32 blocks, u32 bsize)
	99	{
	100	struct nfhd_device *dev;
	101	int dev_id = id - NFHD_DEV_OFFSET;
	102
	103	pr_info("nfhd%u: found device with %u blocks (%u bytes)\n", dev_id,
	104	blocks, bsize);
	105
	106	if (bsize < 512 \|\| (bsize & (bsize - 1))) {
	107	pr_warn("nfhd%u: invalid block size\n", dev_id);
	108	return -EINVAL;
	109	}
	110
	111	dev = kmalloc(sizeof(struct nfhd_device), GFP_KERNEL);
	112	if (!dev)
	113	goto out;
	114
	115	dev->id = id;
	116	dev->blocks = blocks;
	117	dev->bsize = bsize;
	118	dev->bshift = ffs(bsize) - 10;
	119
	120	dev->queue = blk_alloc_queue(GFP_KERNEL);
	121	if (dev->queue == NULL)
	122	goto free_dev;
	123
	124	dev->queue->queuedata = dev;
	125	blk_queue_make_request(dev->queue, nfhd_make_request);
	126	blk_queue_logical_block_size(dev->queue, bsize);
	127
	128	dev->disk = alloc_disk(16);
	129	if (!dev->disk)
	130	goto free_queue;
	131
	132	dev->disk->major = major_num;
	133	dev->disk->first_minor = dev_id * 16;
	134	dev->disk->fops = &nfhd_ops;
	135	dev->disk->private_data = dev;
	136	sprintf(dev->disk->disk_name, "nfhd%u", dev_id);
	137	set_capacity(dev->disk, (sector_t)blocks * (bsize / 512));
	138	dev->disk->queue = dev->queue;
	139
	140	add_disk(dev->disk);
	141
	142	list_add_tail(&dev->list, &nfhd_list);
	143
144	return 0;
145
146	free_queue:
147	blk_cleanup_queue(dev->queue);
148	free_dev:
149	kfree(dev);
150	out:
151	return -ENOMEM;
152	}
153
154	static int __init nfhd_init(void)
155	{
156	u32 blocks, bsize;
157	int i;
158
159	nfhd_id = nf_get_id("XHDI");
160	if (!nfhd_id)
161	return -ENODEV;
162
163	major_num = register_blkdev(major_num, "nfhd");
164	if (major_num <= 0) {
165	pr_warn("nfhd: unable to get major number\n");
166	return major_num;
167	}
168
169	for (i = NFHD_DEV_OFFSET; i < 24; i++) {
170	if (nfhd_get_capacity(i, 0, &blocks, &bsize))
171	continue;
172	nfhd_init_one(i, blocks, bsize);
173	}
174
175	return 0;
176	}
177
178	static void __exit nfhd_exit(void)
179	{
180	struct nfhd_device dev, next;
181
182	list_for_each_entry_safe(dev, next, &nfhd_list, list) {
183	list_del(&dev->list);
184	del_gendisk(dev->disk);
185	put_disk(dev->disk);
186	blk_cleanup_queue(dev->queue);
187	kfree(dev);
188	}
189	unregister_blkdev(major_num, "nfhd");
190	}
191
192	module_init(nfhd_init);
193	module_exit(nfhd_exit);
194
195	MODULE_LICENSE("GPL");