drm/radeon/kms: make atombios_dvo_setup() version based
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / arch / m68k / emu / nfblock.c
blob48e50f8c1c7e07f10d2ac4a400f763585f45a7d1
1 /*
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
6 * for more details.
7 */
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>
23 static long nfhd_id;
25 enum {
26 /* emulation entry points */
27 NFHD_READ_WRITE = 10,
28 NFHD_GET_CAPACITY = 14,
30 /* skip ACSI devices */
31 NFHD_DEV_OFFSET = 8,
34 static inline s32 nfhd_read_write(u32 major, u32 minor, u32 rwflag, u32 recno,
35 u32 count, u32 buf)
37 return nf_call(nfhd_id + NFHD_READ_WRITE, major, minor, rwflag, recno,
38 count, buf);
41 static inline s32 nfhd_get_capacity(u32 major, u32 minor, u32 *blocks,
42 u32 *blocksize)
44 return nf_call(nfhd_id + NFHD_GET_CAPACITY, major, minor, blocks,
45 blocksize);
48 static LIST_HEAD(nfhd_list);
50 static int major_num;
51 module_param(major_num, int, 0);
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;
62 static int nfhd_make_request(struct request_queue *queue, struct bio *bio)
64 struct nfhd_device *dev = queue->queuedata;
65 struct bio_vec *bvec;
66 int i, dir, len, shift;
67 sector_t sec = bio->bi_sector;
69 dir = bio_data_dir(bio);
70 shift = dev->bshift;
71 bio_for_each_segment(bvec, bio, i) {
72 len = bvec->bv_len;
73 len >>= 9;
74 nfhd_read_write(dev->id, 0, dir, sec >> shift, len >> shift,
75 bvec_to_phys(bvec));
76 sec += len;
78 bio_endio(bio, 0);
79 return 0;
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);
87 geo->heads = 4;
88 geo->sectors = 16;
90 return 0;
93 static const struct block_device_operations nfhd_ops = {
94 .owner = THIS_MODULE,
95 .getgeo = nfhd_getgeo,
98 static int __init nfhd_init_one(int id, u32 blocks, u32 bsize)
100 struct nfhd_device *dev;
101 int dev_id = id - NFHD_DEV_OFFSET;
103 pr_info("nfhd%u: found device with %u blocks (%u bytes)\n", dev_id,
104 blocks, bsize);
106 if (bsize < 512 || (bsize & (bsize - 1))) {
107 pr_warn("nfhd%u: invalid block size\n", dev_id);
108 return -EINVAL;
111 dev = kmalloc(sizeof(struct nfhd_device), GFP_KERNEL);
112 if (!dev)
113 goto out;
115 dev->id = id;
116 dev->blocks = blocks;
117 dev->bsize = bsize;
118 dev->bshift = ffs(bsize) - 10;
120 dev->queue = blk_alloc_queue(GFP_KERNEL);
121 if (dev->queue == NULL)
122 goto free_dev;
124 dev->queue->queuedata = dev;
125 blk_queue_make_request(dev->queue, nfhd_make_request);
126 blk_queue_logical_block_size(dev->queue, bsize);
128 dev->disk = alloc_disk(16);
129 if (!dev->disk)
130 goto free_queue;
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;
140 add_disk(dev->disk);
142 list_add_tail(&dev->list, &nfhd_list);
144 return 0;
146 free_queue:
147 blk_cleanup_queue(dev->queue);
148 free_dev:
149 kfree(dev);
150 out:
151 return -ENOMEM;
154 static int __init nfhd_init(void)
156 u32 blocks, bsize;
157 int i;
159 nfhd_id = nf_get_id("XHDI");
160 if (!nfhd_id)
161 return -ENODEV;
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;
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);
175 return 0;
178 static void __exit nfhd_exit(void)
180 struct nfhd_device *dev, *next;
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);
189 unregister_blkdev(major_num, "nfhd");
192 module_init(nfhd_init);
193 module_exit(nfhd_exit);
195 MODULE_LICENSE("GPL");