block: remove support for bio remapping from ->make_request
[linux-3.10.git] / arch / m68k / emu / nfblock.c
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 {
44         return nf_call(nfhd_id + NFHD_GET_CAPACITY, major, minor, blocks,
45                        blocksize);
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
62 static void nfhd_make_request(struct request_queue *queue, struct bio *bio)
63 {
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;
68
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;
77         }
78         bio_endio(bio, 0);
79 }
80
81 static int nfhd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
82 {
83         struct nfhd_device *dev = bdev->bd_disk->private_data;
84
85         geo->cylinders = dev->blocks >> (6 - dev->bshift);
86         geo->heads = 4;
87         geo->sectors = 16;
88
89         return 0;
90 }
91
92 static const struct block_device_operations nfhd_ops = {
93         .owner  = THIS_MODULE,
94         .getgeo = nfhd_getgeo,
95 };
96
97 static int __init nfhd_init_one(int id, u32 blocks, u32 bsize)
98 {
99         struct nfhd_device *dev;
100         int dev_id = id - NFHD_DEV_OFFSET;
101
102         pr_info("nfhd%u: found device with %u blocks (%u bytes)\n", dev_id,
103                 blocks, bsize);
104
105         if (bsize < 512 || (bsize & (bsize - 1))) {
106                 pr_warn("nfhd%u: invalid block size\n", dev_id);
107                 return -EINVAL;
108         }
109
110         dev = kmalloc(sizeof(struct nfhd_device), GFP_KERNEL);
111         if (!dev)
112                 goto out;
113
114         dev->id = id;
115         dev->blocks = blocks;
116         dev->bsize = bsize;
117         dev->bshift = ffs(bsize) - 10;
118
119         dev->queue = blk_alloc_queue(GFP_KERNEL);
120         if (dev->queue == NULL)
121                 goto free_dev;
122
123         dev->queue->queuedata = dev;
124         blk_queue_make_request(dev->queue, nfhd_make_request);
125         blk_queue_logical_block_size(dev->queue, bsize);
126
127         dev->disk = alloc_disk(16);
128         if (!dev->disk)
129                 goto free_queue;
130
131         dev->disk->major = major_num;
132         dev->disk->first_minor = dev_id * 16;
133         dev->disk->fops = &nfhd_ops;
134         dev->disk->private_data = dev;
135         sprintf(dev->disk->disk_name, "nfhd%u", dev_id);
136         set_capacity(dev->disk, (sector_t)blocks * (bsize / 512));
137         dev->disk->queue = dev->queue;
138
139         add_disk(dev->disk);
140
141         list_add_tail(&dev->list, &nfhd_list);
142
143         return 0;
144
145 free_queue:
146         blk_cleanup_queue(dev->queue);
147 free_dev:
148         kfree(dev);
149 out:
150         return -ENOMEM;
151 }
152
153 static int __init nfhd_init(void)
154 {
155         u32 blocks, bsize;
156         int i;
157
158         nfhd_id = nf_get_id("XHDI");
159         if (!nfhd_id)
160                 return -ENODEV;
161
162         major_num = register_blkdev(major_num, "nfhd");
163         if (major_num <= 0) {
164                 pr_warn("nfhd: unable to get major number\n");
165                 return major_num;
166         }
167
168         for (i = NFHD_DEV_OFFSET; i < 24; i++) {
169                 if (nfhd_get_capacity(i, 0, &blocks, &bsize))
170                         continue;
171                 nfhd_init_one(i, blocks, bsize);
172         }
173
174         return 0;
175 }
176
177 static void __exit nfhd_exit(void)
178 {
179         struct nfhd_device *dev, *next;
180
181         list_for_each_entry_safe(dev, next, &nfhd_list, list) {
182                 list_del(&dev->list);
183                 del_gendisk(dev->disk);
184                 put_disk(dev->disk);
185                 blk_cleanup_queue(dev->queue);
186                 kfree(dev);
187         }
188         unregister_blkdev(major_num, "nfhd");
189 }
190
191 module_init(nfhd_init);
192 module_exit(nfhd_exit);
193
194 MODULE_LICENSE("GPL");