Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/klassert/ipsec
[linux-2.6-microblaze.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,
45                        virt_to_phys(blocks), virt_to_phys(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 blk_qc_t nfhd_make_request(struct request_queue *queue, struct bio *bio)
63 {
64         struct nfhd_device *dev = queue->queuedata;
65         struct bio_vec bvec;
66         struct bvec_iter iter;
67         int dir, len, shift;
68         sector_t sec = bio->bi_iter.bi_sector;
69
70         dir = bio_data_dir(bio);
71         shift = dev->bshift;
72         bio_for_each_segment(bvec, bio, iter) {
73                 len = bvec.bv_len;
74                 len >>= 9;
75                 nfhd_read_write(dev->id, 0, dir, sec >> shift, len >> shift,
76                                 bvec_to_phys(&bvec));
77                 sec += len;
78         }
79         bio_endio(bio);
80         return BLK_QC_T_NONE;
81 }
82
83 static int nfhd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
84 {
85         struct nfhd_device *dev = bdev->bd_disk->private_data;
86
87         geo->cylinders = dev->blocks >> (6 - dev->bshift);
88         geo->heads = 4;
89         geo->sectors = 16;
90
91         return 0;
92 }
93
94 static const struct block_device_operations nfhd_ops = {
95         .owner  = THIS_MODULE,
96         .getgeo = nfhd_getgeo,
97 };
98
99 static int __init nfhd_init_one(int id, u32 blocks, u32 bsize)
100 {
101         struct nfhd_device *dev;
102         int dev_id = id - NFHD_DEV_OFFSET;
103
104         pr_info("nfhd%u: found device with %u blocks (%u bytes)\n", dev_id,
105                 blocks, bsize);
106
107         if (bsize < 512 || (bsize & (bsize - 1))) {
108                 pr_warn("nfhd%u: invalid block size\n", dev_id);
109                 return -EINVAL;
110         }
111
112         dev = kmalloc(sizeof(struct nfhd_device), GFP_KERNEL);
113         if (!dev)
114                 goto out;
115
116         dev->id = id;
117         dev->blocks = blocks;
118         dev->bsize = bsize;
119         dev->bshift = ffs(bsize) - 10;
120
121         dev->queue = blk_alloc_queue(GFP_KERNEL);
122         if (dev->queue == NULL)
123                 goto free_dev;
124
125         dev->queue->queuedata = dev;
126         blk_queue_make_request(dev->queue, nfhd_make_request);
127         blk_queue_logical_block_size(dev->queue, bsize);
128
129         dev->disk = alloc_disk(16);
130         if (!dev->disk)
131                 goto free_queue;
132
133         dev->disk->major = major_num;
134         dev->disk->first_minor = dev_id * 16;
135         dev->disk->fops = &nfhd_ops;
136         dev->disk->private_data = dev;
137         sprintf(dev->disk->disk_name, "nfhd%u", dev_id);
138         set_capacity(dev->disk, (sector_t)blocks * (bsize / 512));
139         dev->disk->queue = dev->queue;
140
141         add_disk(dev->disk);
142
143         list_add_tail(&dev->list, &nfhd_list);
144
145         return 0;
146
147 free_queue:
148         blk_cleanup_queue(dev->queue);
149 free_dev:
150         kfree(dev);
151 out:
152         return -ENOMEM;
153 }
154
155 static int __init nfhd_init(void)
156 {
157         u32 blocks, bsize;
158         int i;
159
160         nfhd_id = nf_get_id("XHDI");
161         if (!nfhd_id)
162                 return -ENODEV;
163
164         major_num = register_blkdev(major_num, "nfhd");
165         if (major_num <= 0) {
166                 pr_warn("nfhd: unable to get major number\n");
167                 return major_num;
168         }
169
170         for (i = NFHD_DEV_OFFSET; i < 24; i++) {
171                 if (nfhd_get_capacity(i, 0, &blocks, &bsize))
172                         continue;
173                 nfhd_init_one(i, blocks, bsize);
174         }
175
176         return 0;
177 }
178
179 static void __exit nfhd_exit(void)
180 {
181         struct nfhd_device *dev, *next;
182
183         list_for_each_entry_safe(dev, next, &nfhd_list, list) {
184                 list_del(&dev->list);
185                 del_gendisk(dev->disk);
186                 put_disk(dev->disk);
187                 blk_cleanup_queue(dev->queue);
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");