^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) * ARAnyM block device driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * This file is subject to the terms and conditions of the GNU General Public
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * License. See the file COPYING in the main directory of this archive
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * for more details.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/moduleparam.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/genhd.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/blkdev.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/hdreg.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <asm/natfeat.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) static long nfhd_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) enum {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) /* emulation entry points */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) NFHD_READ_WRITE = 10,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) NFHD_GET_CAPACITY = 14,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) /* skip ACSI devices */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) NFHD_DEV_OFFSET = 8,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) static inline s32 nfhd_read_write(u32 major, u32 minor, u32 rwflag, u32 recno,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) u32 count, u32 buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) return nf_call(nfhd_id + NFHD_READ_WRITE, major, minor, rwflag, recno,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) count, buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) static inline s32 nfhd_get_capacity(u32 major, u32 minor, u32 *blocks,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) u32 *blocksize)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) return nf_call(nfhd_id + NFHD_GET_CAPACITY, major, minor,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) virt_to_phys(blocks), virt_to_phys(blocksize));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) static LIST_HEAD(nfhd_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) static int major_num;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) module_param(major_num, int, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) struct nfhd_device {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) struct list_head list;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) int id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) u32 blocks, bsize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) int bshift;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) struct request_queue *queue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) struct gendisk *disk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) static blk_qc_t nfhd_submit_bio(struct bio *bio)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) struct nfhd_device *dev = bio->bi_disk->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) struct bio_vec bvec;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) struct bvec_iter iter;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) int dir, len, shift;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) sector_t sec = bio->bi_iter.bi_sector;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) dir = bio_data_dir(bio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) shift = dev->bshift;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) bio_for_each_segment(bvec, bio, iter) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) len = bvec.bv_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) len >>= 9;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) nfhd_read_write(dev->id, 0, dir, sec >> shift, len >> shift,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) page_to_phys(bvec.bv_page) + bvec.bv_offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) sec += len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) bio_endio(bio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) return BLK_QC_T_NONE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) static int nfhd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) struct nfhd_device *dev = bdev->bd_disk->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) geo->cylinders = dev->blocks >> (6 - dev->bshift);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) geo->heads = 4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) geo->sectors = 16;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) static const struct block_device_operations nfhd_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) .owner = THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) .submit_bio = nfhd_submit_bio,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) .getgeo = nfhd_getgeo,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) static int __init nfhd_init_one(int id, u32 blocks, u32 bsize)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) struct nfhd_device *dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) int dev_id = id - NFHD_DEV_OFFSET;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) pr_info("nfhd%u: found device with %u blocks (%u bytes)\n", dev_id,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) blocks, bsize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) if (bsize < 512 || (bsize & (bsize - 1))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) pr_warn("nfhd%u: invalid block size\n", dev_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) dev = kmalloc(sizeof(struct nfhd_device), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) if (!dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) dev->id = id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) dev->blocks = blocks;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) dev->bsize = bsize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) dev->bshift = ffs(bsize) - 10;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) dev->queue = blk_alloc_queue(NUMA_NO_NODE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) if (dev->queue == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) goto free_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) blk_queue_logical_block_size(dev->queue, bsize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) dev->disk = alloc_disk(16);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) if (!dev->disk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) goto free_queue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) dev->disk->major = major_num;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) dev->disk->first_minor = dev_id * 16;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) dev->disk->fops = &nfhd_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) dev->disk->private_data = dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) sprintf(dev->disk->disk_name, "nfhd%u", dev_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) set_capacity(dev->disk, (sector_t)blocks * (bsize / 512));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) dev->disk->queue = dev->queue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) add_disk(dev->disk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) list_add_tail(&dev->list, &nfhd_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) free_queue:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) blk_cleanup_queue(dev->queue);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) free_dev:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) kfree(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) static int __init nfhd_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) u32 blocks, bsize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) nfhd_id = nf_get_id("XHDI");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) if (!nfhd_id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) ret = register_blkdev(major_num, "nfhd");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) pr_warn("nfhd: unable to get major number\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) if (!major_num)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) major_num = ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) for (i = NFHD_DEV_OFFSET; i < 24; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) if (nfhd_get_capacity(i, 0, &blocks, &bsize))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) nfhd_init_one(i, blocks, bsize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) static void __exit nfhd_exit(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) struct nfhd_device *dev, *next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) list_for_each_entry_safe(dev, next, &nfhd_list, list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) list_del(&dev->list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) del_gendisk(dev->disk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) put_disk(dev->disk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) blk_cleanup_queue(dev->queue);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) kfree(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) unregister_blkdev(major_num, "nfhd");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) module_init(nfhd_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) module_exit(nfhd_exit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) MODULE_LICENSE("GPL");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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