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> | |
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 | { | |
55490050 GU |
44 | return nf_call(nfhd_id + NFHD_GET_CAPACITY, major, minor, |
45 | virt_to_phys(blocks), virt_to_phys(blocksize)); | |
b2edd2fd RZ |
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 | ||
dece1635 | 62 | static blk_qc_t nfhd_make_request(struct request_queue *queue, struct bio *bio) |
b2edd2fd RZ |
63 | { |
64 | struct nfhd_device *dev = queue->queuedata; | |
7988613b KO |
65 | struct bio_vec bvec; |
66 | struct bvec_iter iter; | |
67 | int dir, len, shift; | |
4f024f37 | 68 | sector_t sec = bio->bi_iter.bi_sector; |
b2edd2fd RZ |
69 | |
70 | dir = bio_data_dir(bio); | |
71 | shift = dev->bshift; | |
7988613b KO |
72 | bio_for_each_segment(bvec, bio, iter) { |
73 | len = bvec.bv_len; | |
b2edd2fd RZ |
74 | len >>= 9; |
75 | nfhd_read_write(dev->id, 0, dir, sec >> shift, len >> shift, | |
7988613b | 76 | bvec_to_phys(&bvec)); |
b2edd2fd RZ |
77 | sec += len; |
78 | } | |
4246a0b6 | 79 | bio_endio(bio); |
dece1635 | 80 | return BLK_QC_T_NONE; |
b2edd2fd RZ |
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"); |