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Linux/arch/m68k/emu/nfblock.c

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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 
 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 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         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, 0);
 80 }
 81 
 82 static 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 
 93 static const struct block_device_operations nfhd_ops = {
 94         .owner  = THIS_MODULE,
 95         .getgeo = nfhd_getgeo,
 96 };
 97 
 98 static 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 
146 free_queue:
147         blk_cleanup_queue(dev->queue);
148 free_dev:
149         kfree(dev);
150 out:
151         return -ENOMEM;
152 }
153 
154 static 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 
178 static 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 
192 module_init(nfhd_init);
193 module_exit(nfhd_exit);
194 
195 MODULE_LICENSE("GPL");
196 

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