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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
23static long nfhd_id;
24
25enum {
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
34static 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
41static 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
48static LIST_HEAD(nfhd_list);
49
50static int major_num;
51module_param(major_num, int, 0);
52
53struct 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
62static int 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 return 0;
80}
81
82static int nfhd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
83{
84 struct nfhd_device *dev = bdev->bd_disk->private_data;
85
86 geo->cylinders = dev->blocks >> (6 - dev->bshift);
87 geo->heads = 4;
88 geo->sectors = 16;
89
90 return 0;
91}
92
93static const struct block_device_operations nfhd_ops = {
94 .owner = THIS_MODULE,
95 .getgeo = nfhd_getgeo,
96};
97
98static int __init nfhd_init_one(int id, u32 blocks, u32 bsize)
99{
100 struct nfhd_device *dev;
101 int dev_id = id - NFHD_DEV_OFFSET;
102
103 pr_info("nfhd%u: found device with %u blocks (%u bytes)\n", dev_id,
104 blocks, bsize);
105
106 if (bsize < 512 || (bsize & (bsize - 1))) {
107 pr_warn("nfhd%u: invalid block size\n", dev_id);
108 return -EINVAL;
109 }
110
111 dev = kmalloc(sizeof(struct nfhd_device), GFP_KERNEL);
112 if (!dev)
113 goto out;
114
115 dev->id = id;
116 dev->blocks = blocks;
117 dev->bsize = bsize;
118 dev->bshift = ffs(bsize) - 10;
119
120 dev->queue = blk_alloc_queue(GFP_KERNEL);
121 if (dev->queue == NULL)
122 goto free_dev;
123
124 dev->queue->queuedata = dev;
125 blk_queue_make_request(dev->queue, nfhd_make_request);
126 blk_queue_logical_block_size(dev->queue, bsize);
127
128 dev->disk = alloc_disk(16);
129 if (!dev->disk)
130 goto free_queue;
131
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;
139
140 add_disk(dev->disk);
141
142 list_add_tail(&dev->list, &nfhd_list);
143
144 return 0;
145
146free_queue:
147 blk_cleanup_queue(dev->queue);
148free_dev:
149 kfree(dev);
150out:
151 return -ENOMEM;
152}
153
154static int __init nfhd_init(void)
155{
156 u32 blocks, bsize;
157 int i;
158
159 nfhd_id = nf_get_id("XHDI");
160 if (!nfhd_id)
161 return -ENODEV;
162
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;
167 }
168
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);
173 }
174
175 return 0;
176}
177
178static void __exit nfhd_exit(void)
179{
180 struct nfhd_device *dev, *next;
181
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);
188 }
189 unregister_blkdev(major_num, "nfhd");
190}
191
192module_init(nfhd_init);
193module_exit(nfhd_exit);
194
195MODULE_LICENSE("GPL");
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/blkdev.h>
17#include <linux/hdreg.h>
18#include <linux/slab.h>
19
20#include <asm/natfeat.h>
21
22static long nfhd_id;
23
24enum {
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
33static 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
40static inline s32 nfhd_get_capacity(u32 major, u32 minor, u32 *blocks,
41 u32 *blocksize)
42{
43 return nf_call(nfhd_id + NFHD_GET_CAPACITY, major, minor,
44 virt_to_phys(blocks), virt_to_phys(blocksize));
45}
46
47static LIST_HEAD(nfhd_list);
48
49static int major_num;
50module_param(major_num, int, 0);
51
52struct nfhd_device {
53 struct list_head list;
54 int id;
55 u32 blocks, bsize;
56 int bshift;
57 struct gendisk *disk;
58};
59
60static void nfhd_submit_bio(struct bio *bio)
61{
62 struct nfhd_device *dev = bio->bi_bdev->bd_disk->private_data;
63 struct bio_vec bvec;
64 struct bvec_iter iter;
65 int dir, len, shift;
66 sector_t sec = bio->bi_iter.bi_sector;
67
68 dir = bio_data_dir(bio);
69 shift = dev->bshift;
70 bio_for_each_segment(bvec, bio, iter) {
71 len = bvec.bv_len;
72 len >>= 9;
73 nfhd_read_write(dev->id, 0, dir, sec >> shift, len >> shift,
74 bvec_phys(&bvec));
75 sec += len;
76 }
77 bio_endio(bio);
78}
79
80static 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
91static const struct block_device_operations nfhd_ops = {
92 .owner = THIS_MODULE,
93 .submit_bio = nfhd_submit_bio,
94 .getgeo = nfhd_getgeo,
95};
96
97static int __init nfhd_init_one(int id, u32 blocks, u32 bsize)
98{
99 struct queue_limits lim = {
100 .logical_block_size = bsize,
101 .features = BLK_FEAT_ROTATIONAL,
102 };
103 struct nfhd_device *dev;
104 int dev_id = id - NFHD_DEV_OFFSET;
105 int err = -ENOMEM;
106
107 pr_info("nfhd%u: found device with %u blocks (%u bytes)\n", dev_id,
108 blocks, bsize);
109
110 if (bsize < 512 || (bsize & (bsize - 1))) {
111 pr_warn("nfhd%u: invalid block size\n", dev_id);
112 return -EINVAL;
113 }
114
115 dev = kmalloc(sizeof(struct nfhd_device), GFP_KERNEL);
116 if (!dev)
117 goto out;
118
119 dev->id = id;
120 dev->blocks = blocks;
121 dev->bsize = bsize;
122 dev->bshift = ffs(bsize) - 10;
123
124 dev->disk = blk_alloc_disk(&lim, NUMA_NO_NODE);
125 if (IS_ERR(dev->disk)) {
126 err = PTR_ERR(dev->disk);
127 goto free_dev;
128 }
129
130 dev->disk->major = major_num;
131 dev->disk->first_minor = dev_id * 16;
132 dev->disk->minors = 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 err = add_disk(dev->disk);
138 if (err)
139 goto out_cleanup_disk;
140
141 list_add_tail(&dev->list, &nfhd_list);
142
143 return 0;
144
145out_cleanup_disk:
146 put_disk(dev->disk);
147free_dev:
148 kfree(dev);
149out:
150 return err;
151}
152
153static int __init nfhd_init(void)
154{
155 u32 blocks, bsize;
156 int ret;
157 int i;
158
159 nfhd_id = nf_get_id("XHDI");
160 if (!nfhd_id)
161 return -ENODEV;
162
163 ret = register_blkdev(major_num, "nfhd");
164 if (ret < 0) {
165 pr_warn("nfhd: unable to get major number\n");
166 return ret;
167 }
168
169 if (!major_num)
170 major_num = ret;
171
172 for (i = NFHD_DEV_OFFSET; i < 24; i++) {
173 if (nfhd_get_capacity(i, 0, &blocks, &bsize))
174 continue;
175 nfhd_init_one(i, blocks, bsize);
176 }
177
178 return 0;
179}
180
181static void __exit nfhd_exit(void)
182{
183 struct nfhd_device *dev, *next;
184
185 list_for_each_entry_safe(dev, next, &nfhd_list, list) {
186 list_del(&dev->list);
187 del_gendisk(dev->disk);
188 put_disk(dev->disk);
189 kfree(dev);
190 }
191 unregister_blkdev(major_num, "nfhd");
192}
193
194module_init(nfhd_init);
195module_exit(nfhd_exit);
196
197MODULE_DESCRIPTION("Atari NatFeat block device driver");
198MODULE_LICENSE("GPL");