2 * ARAnyM block device driver
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
9 #include <linux/module.h>
10 #include <linux/moduleparam.h>
11 #include <linux/init.h>
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>
21 #include <asm/natfeat.h>
26 /* emulation entry points */
28 NFHD_GET_CAPACITY = 14,
30 /* skip ACSI devices */
34 static inline s32 nfhd_read_write(u32 major, u32 minor, u32 rwflag, u32 recno,
37 return nf_call(nfhd_id + NFHD_READ_WRITE, major, minor, rwflag, recno,
41 static inline s32 nfhd_get_capacity(u32 major, u32 minor, u32 *blocks,
44 return nf_call(nfhd_id + NFHD_GET_CAPACITY, major, minor,
45 virt_to_phys(blocks), virt_to_phys(blocksize));
48 static LIST_HEAD(nfhd_list);
51 module_param(major_num, int, 0);
54 struct list_head list;
61 static blk_qc_t nfhd_submit_bio(struct bio *bio)
63 struct nfhd_device *dev = bio->bi_bdev->bd_disk->private_data;
65 struct bvec_iter iter;
67 sector_t sec = bio->bi_iter.bi_sector;
69 dir = bio_data_dir(bio);
71 bio_for_each_segment(bvec, bio, iter) {
74 nfhd_read_write(dev->id, 0, dir, sec >> shift, len >> shift,
75 page_to_phys(bvec.bv_page) + bvec.bv_offset);
82 static int nfhd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
84 struct nfhd_device *dev = bdev->bd_disk->private_data;
86 geo->cylinders = dev->blocks >> (6 - dev->bshift);
93 static const struct block_device_operations nfhd_ops = {
95 .submit_bio = nfhd_submit_bio,
96 .getgeo = nfhd_getgeo,
99 static int __init nfhd_init_one(int id, u32 blocks, u32 bsize)
101 struct nfhd_device *dev;
102 int dev_id = id - NFHD_DEV_OFFSET;
104 pr_info("nfhd%u: found device with %u blocks (%u bytes)\n", dev_id,
107 if (bsize < 512 || (bsize & (bsize - 1))) {
108 pr_warn("nfhd%u: invalid block size\n", dev_id);
112 dev = kmalloc(sizeof(struct nfhd_device), GFP_KERNEL);
117 dev->blocks = blocks;
119 dev->bshift = ffs(bsize) - 10;
121 dev->disk = blk_alloc_disk(NUMA_NO_NODE);
125 dev->disk->major = major_num;
126 dev->disk->first_minor = dev_id * 16;
127 dev->disk->minors = 16;
128 dev->disk->fops = &nfhd_ops;
129 dev->disk->private_data = dev;
130 sprintf(dev->disk->disk_name, "nfhd%u", dev_id);
131 set_capacity(dev->disk, (sector_t)blocks * (bsize / 512));
132 blk_queue_logical_block_size(dev->disk->queue, bsize);
135 list_add_tail(&dev->list, &nfhd_list);
145 static int __init nfhd_init(void)
151 nfhd_id = nf_get_id("XHDI");
155 ret = register_blkdev(major_num, "nfhd");
157 pr_warn("nfhd: unable to get major number\n");
164 for (i = NFHD_DEV_OFFSET; i < 24; i++) {
165 if (nfhd_get_capacity(i, 0, &blocks, &bsize))
167 nfhd_init_one(i, blocks, bsize);
173 static void __exit nfhd_exit(void)
175 struct nfhd_device *dev, *next;
177 list_for_each_entry_safe(dev, next, &nfhd_list, list) {
178 list_del(&dev->list);
179 del_gendisk(dev->disk);
180 blk_cleanup_disk(dev->disk);
183 unregister_blkdev(major_num, "nfhd");
186 module_init(nfhd_init);
187 module_exit(nfhd_exit);
189 MODULE_LICENSE("GPL");