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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 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");
197 

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