[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/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 gendisk *disk;
};

static void nfhd_submit_bio(struct bio *bio)
{
	struct nfhd_device *dev = bio->bi_bdev->bd_disk->private_data;
	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,
				page_to_phys(bvec.bv_page) + bvec.bv_offset);
		sec += len;
	}
	bio_endio(bio);
}

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,
	.submit_bio = nfhd_submit_bio,
	.getgeo	= nfhd_getgeo,
};

static int __init nfhd_init_one(int id, u32 blocks, u32 bsize)
{
	struct queue_limits lim = {
		.logical_block_size	= bsize,
	};
	struct nfhd_device *dev;
	int dev_id = id - NFHD_DEV_OFFSET;
	int err = -ENOMEM;

	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->disk = blk_alloc_disk(&lim, NUMA_NO_NODE);
	if (IS_ERR(dev->disk)) {
		err = PTR_ERR(dev->disk);
		goto free_dev;
	}

	dev->disk->major = major_num;
	dev->disk->first_minor = dev_id * 16;
	dev->disk->minors = 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));
	err = add_disk(dev->disk);
	if (err)
		goto out_cleanup_disk;

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

	return 0;

out_cleanup_disk:
	put_disk(dev->disk);
free_dev:
	kfree(dev);
out:
	return err;
}

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

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

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

	if (!major_num)
		major_num = ret;

	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);
		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>
b2edd2fd RZ	16	#include <linux/blkdev.h>
	17	#include <linux/hdreg.h>
	18	#include <linux/slab.h>
	19
	20	#include <asm/natfeat.h>
	21
	22	static long nfhd_id;
	23
	24	enum {
	25	/* emulation entry points */
	26	NFHD_READ_WRITE = 10,
	27	NFHD_GET_CAPACITY = 14,
	28
	29	/* skip ACSI devices */
	30	NFHD_DEV_OFFSET = 8,
	31	};
	32
	33	static inline s32 nfhd_read_write(u32 major, u32 minor, u32 rwflag, u32 recno,
	34	u32 count, u32 buf)
	35	{
	36	return nf_call(nfhd_id + NFHD_READ_WRITE, major, minor, rwflag, recno,
	37	count, buf);
	38	}
	39
	40	static inline s32 nfhd_get_capacity(u32 major, u32 minor, u32 *blocks,
	41	u32 *blocksize)
	42	{
55490050 GU	43	return nf_call(nfhd_id + NFHD_GET_CAPACITY, major, minor,
55490050 GU	44	virt_to_phys(blocks), virt_to_phys(blocksize));
b2edd2fd RZ	45	}
	46
	47	static LIST_HEAD(nfhd_list);
	48
	49	static int major_num;
	50	module_param(major_num, int, 0);
	51
	52	struct nfhd_device {
	53	struct list_head list;
	54	int id;
	55	u32 blocks, bsize;
	56	int bshift;
b2edd2fd RZ	57	struct gendisk *disk;
	58	};
	59
3e08773c	60	static void nfhd_submit_bio(struct bio *bio)
b2edd2fd	61	{
309dca30	62	struct nfhd_device *dev = bio->bi_bdev->bd_disk->private_data;
7988613b KO	63	struct bio_vec bvec;
	64	struct bvec_iter iter;
	65	int dir, len, shift;
4f024f37	66	sector_t sec = bio->bi_iter.bi_sector;
b2edd2fd RZ	67
	68	dir = bio_data_dir(bio);
	69	shift = dev->bshift;
7988613b KO	70	bio_for_each_segment(bvec, bio, iter) {
7988613b KO	71	len = bvec.bv_len;
b2edd2fd RZ	72	len >>= 9;
b2edd2fd RZ	73	nfhd_read_write(dev->id, 0, dir, sec >> shift, len >> shift,
6e768461	74	page_to_phys(bvec.bv_page) + bvec.bv_offset);
b2edd2fd RZ	75	sec += len;
b2edd2fd RZ	76	}
4246a0b6	77	bio_endio(bio);
b2edd2fd RZ	78	}
	79
	80	static int nfhd_getgeo(struct block_device bdev, struct hd_geometry geo)
	81	{
	82	struct nfhd_device *dev = bdev->bd_disk->private_data;
	83
	84	geo->cylinders = dev->blocks >> (6 - dev->bshift);
	85	geo->heads = 4;
	86	geo->sectors = 16;
	87
	88	return 0;
	89	}
	90
	91	static const struct block_device_operations nfhd_ops = {
	92	.owner = THIS_MODULE,
c62b37d9	93	.submit_bio = nfhd_submit_bio,
b2edd2fd RZ	94	.getgeo = nfhd_getgeo,
	95	};
	96
	97	static int __init nfhd_init_one(int id, u32 blocks, u32 bsize)
	98	{
2cfe0104 CH	99	struct queue_limits lim = {
	100	.logical_block_size = bsize,
	101	};
b2edd2fd RZ	102	struct nfhd_device *dev;
b2edd2fd RZ	103	int dev_id = id - NFHD_DEV_OFFSET;
21fd880d	104	int err = -ENOMEM;
b2edd2fd RZ	105
	106	pr_info("nfhd%u: found device with %u blocks (%u bytes)\n", dev_id,
	107	blocks, bsize);
	108
	109	if (bsize < 512 \|\| (bsize & (bsize - 1))) {
	110	pr_warn("nfhd%u: invalid block size\n", dev_id);
	111	return -EINVAL;
	112	}
	113
	114	dev = kmalloc(sizeof(struct nfhd_device), GFP_KERNEL);
	115	if (!dev)
	116	goto out;
	117
	118	dev->id = id;
	119	dev->blocks = blocks;
	120	dev->bsize = bsize;
	121	dev->bshift = ffs(bsize) - 10;
	122
2cfe0104	123	dev->disk = blk_alloc_disk(&lim, NUMA_NO_NODE);
74fa8f9c CH	124	if (IS_ERR(dev->disk)) {
74fa8f9c CH	125	err = PTR_ERR(dev->disk);
c3e23538	126	goto free_dev;
74fa8f9c	127	}
b2edd2fd RZ	128
	129	dev->disk->major = major_num;
	130	dev->disk->first_minor = dev_id * 16;
c3e23538	131	dev->disk->minors = 16;
b2edd2fd RZ	132	dev->disk->fops = &nfhd_ops;
	133	dev->disk->private_data = dev;
	134	sprintf(dev->disk->disk_name, "nfhd%u", dev_id);
	135	set_capacity(dev->disk, (sector_t)blocks * (bsize / 512));
21fd880d LC	136	err = add_disk(dev->disk);
	137	if (err)
	138	goto out_cleanup_disk;
b2edd2fd RZ	139
	140	list_add_tail(&dev->list, &nfhd_list);
	141
	142	return 0;
	143
21fd880d	144	out_cleanup_disk:
8b9ab626	145	put_disk(dev->disk);
b2edd2fd RZ	146	free_dev:
	147	kfree(dev);
	148	out:
21fd880d	149	return err;
b2edd2fd RZ	150	}
	151
	152	static int __init nfhd_init(void)
	153	{
	154	u32 blocks, bsize;
30363d65	155	int ret;
b2edd2fd RZ	156	int i;
	157
	158	nfhd_id = nf_get_id("XHDI");
	159	if (!nfhd_id)
	160	return -ENODEV;
	161
30363d65 CX	162	ret = register_blkdev(major_num, "nfhd");
30363d65 CX	163	if (ret < 0) {
b2edd2fd	164	pr_warn("nfhd: unable to get major number\n");
30363d65	165	return ret;
b2edd2fd RZ	166	}
b2edd2fd RZ	167
30363d65 CX	168	if (!major_num)
	169	major_num = ret;
	170
b2edd2fd RZ	171	for (i = NFHD_DEV_OFFSET; i < 24; i++) {
	172	if (nfhd_get_capacity(i, 0, &blocks, &bsize))
	173	continue;
	174	nfhd_init_one(i, blocks, bsize);
	175	}
	176
	177	return 0;
	178	}
	179
	180	static void __exit nfhd_exit(void)
	181	{
	182	struct nfhd_device dev, next;
	183
	184	list_for_each_entry_safe(dev, next, &nfhd_list, list) {
	185	list_del(&dev->list);
	186	del_gendisk(dev->disk);
8b9ab626	187	put_disk(dev->disk);
b2edd2fd RZ	188	kfree(dev);
	189	}
	190	unregister_blkdev(major_num, "nfhd");
	191	}
	192
	193	module_init(nfhd_init);
	194	module_exit(nfhd_exit);
	195
	196	MODULE_LICENSE("GPL");