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/**
* @file
*
* @ingroup rtems_blkdev
*
* Block device management.
*/
/*
* Copyright (C) 2001 OKTET Ltd., St.-Petersburg, Russia
* Author: Victor V. Vengerov <vvv@oktet.ru>
*
* @(#) $Id$
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include <errno.h>
#include <string.h>
#include <rtems.h>
#include <rtems/libio.h>
#include <sys/ioctl.h>
#include "rtems/diskdevs.h"
#include "rtems/bdbuf.h"
/* rtems_blkdev_generic_read --
* Generic block device read primitive. Implemented using block device
* buffer management primitives.
*/
rtems_device_driver
rtems_blkdev_generic_read(
rtems_device_major_number major __attribute__((unused)),
rtems_device_minor_number minor __attribute__((unused)),
void * arg)
{
rtems_status_code rc = RTEMS_SUCCESSFUL;
rtems_libio_rw_args_t *args = arg;
rtems_libio_t *iop = args->iop;
rtems_disk_device *dd = iop->data1;
uint32_t block_size = dd->block_size;
char *buf = args->buffer;
uint32_t count = args->count;
rtems_blkdev_bnum block = (rtems_blkdev_bnum) (args->offset / block_size);
uint32_t blkofs = (uint32_t) (args->offset % block_size);
args->bytes_moved = 0;
while (count > 0)
{
rtems_bdbuf_buffer *diskbuf;
uint32_t copy;
rc = rtems_bdbuf_read(dd, block, &diskbuf);
if (rc != RTEMS_SUCCESSFUL)
break;
copy = block_size - blkofs;
if (copy > count)
copy = count;
memcpy(buf, (char *)diskbuf->buffer + blkofs, copy);
rc = rtems_bdbuf_release(diskbuf);
args->bytes_moved += copy;
if (rc != RTEMS_SUCCESSFUL)
break;
count -= copy;
buf += copy;
blkofs = 0;
block++;
}
return rc;
}
/* rtems_blkdev_generic_write --
* Generic block device write primitive. Implemented using block device
* buffer management primitives.
*/
rtems_device_driver
rtems_blkdev_generic_write(
rtems_device_major_number major __attribute__((unused)),
rtems_device_minor_number minor __attribute__((unused)),
void * arg)
{
rtems_status_code rc = RTEMS_SUCCESSFUL;
rtems_libio_rw_args_t *args = arg;
rtems_libio_t *iop = args->iop;
rtems_disk_device *dd = iop->data1;
uint32_t block_size = dd->block_size;
char *buf = args->buffer;
uint32_t count = args->count;
rtems_blkdev_bnum block = (rtems_blkdev_bnum) (args->offset / block_size);
uint32_t blkofs = (uint32_t) (args->offset % block_size);
args->bytes_moved = 0;
while (count > 0)
{
rtems_bdbuf_buffer *diskbuf;
uint32_t copy;
if ((blkofs == 0) && (count >= block_size))
rc = rtems_bdbuf_get(dd, block, &diskbuf);
else
rc = rtems_bdbuf_read(dd, block, &diskbuf);
if (rc != RTEMS_SUCCESSFUL)
break;
copy = block_size - blkofs;
if (copy > count)
copy = count;
memcpy((char *)diskbuf->buffer + blkofs, buf, copy);
args->bytes_moved += copy;
rc = rtems_bdbuf_release_modified(diskbuf);
if (rc != RTEMS_SUCCESSFUL)
break;
count -= copy;
buf += copy;
blkofs = 0;
block++;
}
return rc;
}
/* blkdev_generic_open --
* Generic block device open primitive.
*/
rtems_device_driver
rtems_blkdev_generic_open(
rtems_device_major_number major,
rtems_device_minor_number minor,
void * arg)
{
rtems_libio_open_close_args_t *oc = arg;
rtems_libio_t *iop = oc->iop;
dev_t dev = rtems_filesystem_make_dev_t(major, minor);
rtems_disk_device *dd = rtems_disk_obtain(dev);
iop->data1 = dd;
if (dd != NULL)
return RTEMS_SUCCESSFUL;
else
return RTEMS_UNSATISFIED;
}
/* blkdev_generic_close --
* Generic block device close primitive.
*/
rtems_device_driver
rtems_blkdev_generic_close(
rtems_device_major_number major __attribute__((unused)),
rtems_device_minor_number minor __attribute__((unused)),
void * arg)
{
rtems_libio_open_close_args_t *oc = arg;
rtems_libio_t *iop = oc->iop;
rtems_disk_device *dd = iop->data1;
rtems_disk_release(dd);
return RTEMS_SUCCESSFUL;
}
/* blkdev_generic_ioctl --
* Generic block device ioctl primitive.
*/
rtems_device_driver
rtems_blkdev_generic_ioctl(
rtems_device_major_number major __attribute__((unused)),
rtems_device_minor_number minor __attribute__((unused)),
void * arg)
{
rtems_libio_ioctl_args_t *args = arg;
rtems_libio_t *iop = args->iop;
rtems_disk_device *dd = iop->data1;
int rc;
switch (args->command)
{
case RTEMS_BLKIO_GETMEDIABLKSIZE:
*((uint32_t *) args->buffer) = dd->media_block_size;
args->ioctl_return = 0;
break;
case RTEMS_BLKIO_GETBLKSIZE:
*((uint32_t *) args->buffer) = dd->block_size;
args->ioctl_return = 0;
break;
case RTEMS_BLKIO_SETBLKSIZE:
dd->block_size = *((uint32_t *) args->buffer);
args->ioctl_return = 0;
break;
case RTEMS_BLKIO_GETSIZE:
*((rtems_blkdev_bnum *) args->buffer) = dd->size;
args->ioctl_return = 0;
break;
case RTEMS_BLKIO_SYNCDEV:
rc = rtems_bdbuf_syncdev(dd);
args->ioctl_return = (uint32_t) (rc == RTEMS_SUCCESSFUL ? 0 : -1);
break;
case RTEMS_BLKIO_GETDISKDEV:
*((rtems_disk_device **) args->buffer) = dd;
args->ioctl_return = 0;
break;
case RTEMS_BLKIO_REQUEST:
/*
* It is not allowed to directly access the driver circumventing
* the cache.
*/
args->ioctl_return = (uint32_t) -1;
break;
default:
args->ioctl_return = (uint32_t) dd->ioctl(dd->phys_dev,
args->command,
args->buffer);
break;
}
return RTEMS_SUCCESSFUL;
}
int
rtems_blkdev_ioctl(rtems_disk_device *dd, uint32_t req, void *argp)
{
size_t *arg_size = argp;
int rc = 0;
switch (req)
{
case RTEMS_BLKIO_GETMEDIABLKSIZE:
*arg_size = dd->media_block_size;
break;
case RTEMS_BLKIO_GETBLKSIZE:
*arg_size = dd->block_size;
break;
case RTEMS_BLKIO_SETBLKSIZE:
dd->block_size = *arg_size;
break;
case RTEMS_BLKIO_GETSIZE:
*arg_size = dd->size;
break;
default:
errno = EINVAL;
rc = -1;
break;
}
return rc;
}
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