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Subject[PATCH v2 2/4] m68k/atari: ARAnyM - Add support for block access
Date
From: Roman Zippel <zippel@linux-m68k.org>

[geert: Cleanups and updates]

Signed-off-by: Roman Zippel <zippel@linux-m68k.org>
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Acked-by: Petr Stehlik <pstehlik@sophics.cz>

---
v2: No changes
v1:
- Wrap natfeat calls
Add wrappers with proper prototypes for the natfeat calls in nfblock.
This fixes the problem where sector_t was pushed on the stack as a 64-bit
value if CONFIG_LBDAF=y, while all parameters of the nf_call() varargs
function are 32-bit.

- Update for v2.6.31 block layer changes,
- nfblock needs <linux/slab.h>,
- Make needlessly global functions static,
- Make struct block_device_operations const,
- Use pr_*(),
- Propagate error code from register_blkdev().

arch/m68k/Kconfig | 8 ++
arch/m68k/emu/Makefile | 2 +
arch/m68k/emu/nfblock.c | 195 +++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 205 insertions(+), 0 deletions(-)
create mode 100644 arch/m68k/emu/nfblock.c
diff --git a/arch/m68k/Kconfig b/arch/m68k/Kconfig
index f668a58..2c890b5 100644
--- a/arch/m68k/Kconfig
+++ b/arch/m68k/Kconfig
@@ -247,6 +247,14 @@ config NATFEAT
This option enables support for ARAnyM native features, such as
access to a disk image as /dev/hda.

+config NFBLOCK
+ tristate "NatFeat block device support"
+ depends on BLOCK && NATFEAT
+ help
+ Say Y to include support for the ARAnyM NatFeat block device
+ which allows direct access to the hard drives without using
+ the hardware emulation.
+
comment "Processor type"

config M68020
diff --git a/arch/m68k/emu/Makefile b/arch/m68k/emu/Makefile
index 34cfa34..fc4f77a 100644
--- a/arch/m68k/emu/Makefile
+++ b/arch/m68k/emu/Makefile
@@ -3,3 +3,5 @@
#

obj-y += natfeat.o
+
+obj-$(CONFIG_NFBLOCK) += nfblock.o
diff --git a/arch/m68k/emu/nfblock.c b/arch/m68k/emu/nfblock.c
new file mode 100644
index 0000000..48e50f8
--- /dev/null
+++ b/arch/m68k/emu/nfblock.c
@@ -0,0 +1,195 @@
+/*
+ * ARAnyM block device driver
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file COPYING in the main directory of this archive
+ * for more details.
+ */
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/init.h>
+
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/genhd.h>
+#include <linux/blkdev.h>
+#include <linux/hdreg.h>
+#include <linux/slab.h>
+
+#include <asm/natfeat.h>
+
+static long nfhd_id;
+
+enum {
+ /* emulation entry points */
+ NFHD_READ_WRITE = 10,
+ NFHD_GET_CAPACITY = 14,
+
+ /* skip ACSI devices */
+ NFHD_DEV_OFFSET = 8,
+};
+
+static inline s32 nfhd_read_write(u32 major, u32 minor, u32 rwflag, u32 recno,
+ u32 count, u32 buf)
+{
+ return nf_call(nfhd_id + NFHD_READ_WRITE, major, minor, rwflag, recno,
+ count, buf);
+}
+
+static inline s32 nfhd_get_capacity(u32 major, u32 minor, u32 *blocks,
+ u32 *blocksize)
+{
+ return nf_call(nfhd_id + NFHD_GET_CAPACITY, major, minor, blocks,
+ blocksize);
+}
+
+static LIST_HEAD(nfhd_list);
+
+static int major_num;
+module_param(major_num, int, 0);
+
+struct nfhd_device {
+ struct list_head list;
+ int id;
+ u32 blocks, bsize;
+ int bshift;
+ struct request_queue *queue;
+ struct gendisk *disk;
+};
+
+static int nfhd_make_request(struct request_queue *queue, struct bio *bio)
+{
+ struct nfhd_device *dev = queue->queuedata;
+ struct bio_vec *bvec;
+ int i, dir, len, shift;
+ sector_t sec = bio->bi_sector;
+
+ dir = bio_data_dir(bio);
+ shift = dev->bshift;
+ bio_for_each_segment(bvec, bio, i) {
+ len = bvec->bv_len;
+ len >>= 9;
+ nfhd_read_write(dev->id, 0, dir, sec >> shift, len >> shift,
+ bvec_to_phys(bvec));
+ sec += len;
+ }
+ bio_endio(bio, 0);
+ return 0;
+}
+
+static int nfhd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
+{
+ struct nfhd_device *dev = bdev->bd_disk->private_data;
+
+ geo->cylinders = dev->blocks >> (6 - dev->bshift);
+ geo->heads = 4;
+ geo->sectors = 16;
+
+ return 0;
+}
+
+static const struct block_device_operations nfhd_ops = {
+ .owner = THIS_MODULE,
+ .getgeo = nfhd_getgeo,
+};
+
+static int __init nfhd_init_one(int id, u32 blocks, u32 bsize)
+{
+ struct nfhd_device *dev;
+ int dev_id = id - NFHD_DEV_OFFSET;
+
+ pr_info("nfhd%u: found device with %u blocks (%u bytes)\n", dev_id,
+ blocks, bsize);
+
+ if (bsize < 512 || (bsize & (bsize - 1))) {
+ pr_warn("nfhd%u: invalid block size\n", dev_id);
+ return -EINVAL;
+ }
+
+ dev = kmalloc(sizeof(struct nfhd_device), GFP_KERNEL);
+ if (!dev)
+ goto out;
+
+ dev->id = id;
+ dev->blocks = blocks;
+ dev->bsize = bsize;
+ dev->bshift = ffs(bsize) - 10;
+
+ dev->queue = blk_alloc_queue(GFP_KERNEL);
+ if (dev->queue == NULL)
+ goto free_dev;
+
+ dev->queue->queuedata = dev;
+ blk_queue_make_request(dev->queue, nfhd_make_request);
+ blk_queue_logical_block_size(dev->queue, bsize);
+
+ dev->disk = alloc_disk(16);
+ if (!dev->disk)
+ goto free_queue;
+
+ dev->disk->major = major_num;
+ dev->disk->first_minor = dev_id * 16;
+ dev->disk->fops = &nfhd_ops;
+ dev->disk->private_data = dev;
+ sprintf(dev->disk->disk_name, "nfhd%u", dev_id);
+ set_capacity(dev->disk, (sector_t)blocks * (bsize / 512));
+ dev->disk->queue = dev->queue;
+
+ add_disk(dev->disk);
+
+ list_add_tail(&dev->list, &nfhd_list);
+
+ return 0;
+
+free_queue:
+ blk_cleanup_queue(dev->queue);
+free_dev:
+ kfree(dev);
+out:
+ return -ENOMEM;
+}
+
+static int __init nfhd_init(void)
+{
+ u32 blocks, bsize;
+ int i;
+
+ nfhd_id = nf_get_id("XHDI");
+ if (!nfhd_id)
+ return -ENODEV;
+
+ major_num = register_blkdev(major_num, "nfhd");
+ if (major_num <= 0) {
+ pr_warn("nfhd: unable to get major number\n");
+ return major_num;
+ }
+
+ for (i = NFHD_DEV_OFFSET; i < 24; i++) {
+ if (nfhd_get_capacity(i, 0, &blocks, &bsize))
+ continue;
+ nfhd_init_one(i, blocks, bsize);
+ }
+
+ return 0;
+}
+
+static void __exit nfhd_exit(void)
+{
+ struct nfhd_device *dev, *next;
+
+ list_for_each_entry_safe(dev, next, &nfhd_list, list) {
+ list_del(&dev->list);
+ del_gendisk(dev->disk);
+ put_disk(dev->disk);
+ blk_cleanup_queue(dev->queue);
+ kfree(dev);
+ }
+ unregister_blkdev(major_num, "nfhd");
+}
+
+module_init(nfhd_init);
+module_exit(nfhd_exit);
+
+MODULE_LICENSE("GPL");
--
1.7.0.4


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