Commit | Line | Data |
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b2edd2fd RZ |
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> | |
b2edd2fd RZ |
16 | #include <linux/blkdev.h> |
17 | #include <linux/hdreg.h> | |
18 | #include <linux/slab.h> | |
19 | ||
20 | #include <asm/natfeat.h> | |
21 | ||
22 | static long nfhd_id; | |
23 | ||
24 | enum { | |
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 | ||
33 | static 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 | ||
40 | static inline s32 nfhd_get_capacity(u32 major, u32 minor, u32 *blocks, | |
41 | u32 *blocksize) | |
42 | { | |
55490050 GU |
43 | return nf_call(nfhd_id + NFHD_GET_CAPACITY, major, minor, |
44 | virt_to_phys(blocks), virt_to_phys(blocksize)); | |
b2edd2fd RZ |
45 | } |
46 | ||
47 | static LIST_HEAD(nfhd_list); | |
48 | ||
49 | static int major_num; | |
50 | module_param(major_num, int, 0); | |
51 | ||
52 | struct nfhd_device { | |
53 | struct list_head list; | |
54 | int id; | |
55 | u32 blocks, bsize; | |
56 | int bshift; | |
b2edd2fd RZ |
57 | struct gendisk *disk; |
58 | }; | |
59 | ||
3e08773c | 60 | static void nfhd_submit_bio(struct bio *bio) |
b2edd2fd | 61 | { |
309dca30 | 62 | struct nfhd_device *dev = bio->bi_bdev->bd_disk->private_data; |
7988613b KO |
63 | struct bio_vec bvec; |
64 | struct bvec_iter iter; | |
65 | int dir, len, shift; | |
4f024f37 | 66 | sector_t sec = bio->bi_iter.bi_sector; |
b2edd2fd RZ |
67 | |
68 | dir = bio_data_dir(bio); | |
69 | shift = dev->bshift; | |
7988613b KO |
70 | bio_for_each_segment(bvec, bio, iter) { |
71 | len = bvec.bv_len; | |
b2edd2fd RZ |
72 | len >>= 9; |
73 | nfhd_read_write(dev->id, 0, dir, sec >> shift, len >> shift, | |
6e768461 | 74 | page_to_phys(bvec.bv_page) + bvec.bv_offset); |
b2edd2fd RZ |
75 | sec += len; |
76 | } | |
4246a0b6 | 77 | bio_endio(bio); |
b2edd2fd RZ |
78 | } |
79 | ||
80 | static 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 | ||
91 | static const struct block_device_operations nfhd_ops = { | |
92 | .owner = THIS_MODULE, | |
c62b37d9 | 93 | .submit_bio = nfhd_submit_bio, |
b2edd2fd RZ |
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; | |
21fd880d | 101 | int err = -ENOMEM; |
b2edd2fd RZ |
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 | ||
c3e23538 | 120 | dev->disk = blk_alloc_disk(NUMA_NO_NODE); |
b2edd2fd | 121 | if (!dev->disk) |
c3e23538 | 122 | goto free_dev; |
b2edd2fd RZ |
123 | |
124 | dev->disk->major = major_num; | |
125 | dev->disk->first_minor = dev_id * 16; | |
c3e23538 | 126 | dev->disk->minors = 16; |
b2edd2fd RZ |
127 | dev->disk->fops = &nfhd_ops; |
128 | dev->disk->private_data = dev; | |
129 | sprintf(dev->disk->disk_name, "nfhd%u", dev_id); | |
130 | set_capacity(dev->disk, (sector_t)blocks * (bsize / 512)); | |
c3e23538 | 131 | blk_queue_logical_block_size(dev->disk->queue, bsize); |
21fd880d LC |
132 | err = add_disk(dev->disk); |
133 | if (err) | |
134 | goto out_cleanup_disk; | |
b2edd2fd RZ |
135 | |
136 | list_add_tail(&dev->list, &nfhd_list); | |
137 | ||
138 | return 0; | |
139 | ||
21fd880d LC |
140 | out_cleanup_disk: |
141 | blk_cleanup_disk(dev->disk); | |
b2edd2fd RZ |
142 | free_dev: |
143 | kfree(dev); | |
144 | out: | |
21fd880d | 145 | return err; |
b2edd2fd RZ |
146 | } |
147 | ||
148 | static int __init nfhd_init(void) | |
149 | { | |
150 | u32 blocks, bsize; | |
30363d65 | 151 | int ret; |
b2edd2fd RZ |
152 | int i; |
153 | ||
154 | nfhd_id = nf_get_id("XHDI"); | |
155 | if (!nfhd_id) | |
156 | return -ENODEV; | |
157 | ||
30363d65 CX |
158 | ret = register_blkdev(major_num, "nfhd"); |
159 | if (ret < 0) { | |
b2edd2fd | 160 | pr_warn("nfhd: unable to get major number\n"); |
30363d65 | 161 | return ret; |
b2edd2fd RZ |
162 | } |
163 | ||
30363d65 CX |
164 | if (!major_num) |
165 | major_num = ret; | |
166 | ||
b2edd2fd RZ |
167 | for (i = NFHD_DEV_OFFSET; i < 24; i++) { |
168 | if (nfhd_get_capacity(i, 0, &blocks, &bsize)) | |
169 | continue; | |
170 | nfhd_init_one(i, blocks, bsize); | |
171 | } | |
172 | ||
173 | return 0; | |
174 | } | |
175 | ||
176 | static void __exit nfhd_exit(void) | |
177 | { | |
178 | struct nfhd_device *dev, *next; | |
179 | ||
180 | list_for_each_entry_safe(dev, next, &nfhd_list, list) { | |
181 | list_del(&dev->list); | |
182 | del_gendisk(dev->disk); | |
c3e23538 | 183 | blk_cleanup_disk(dev->disk); |
b2edd2fd RZ |
184 | kfree(dev); |
185 | } | |
186 | unregister_blkdev(major_num, "nfhd"); | |
187 | } | |
188 | ||
189 | module_init(nfhd_init); | |
190 | module_exit(nfhd_exit); | |
191 | ||
192 | MODULE_LICENSE("GPL"); |