blkdev.h

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/*
 * Copyright (C) 2001 OKTET Ltd., St.-Petersburg, Russia
 * Author: Victor V. Vengerov <vvv@oktet.ru>
 */

#ifndef _RTEMS_BLKDEV_H
#define _RTEMS_BLKDEV_H

#include <rtems.h>
#include <rtems/diskdevs.h>
#include <rtems/bspIo.h>
#include <sys/ioctl.h>
#include <stdio.h>

#ifdef __cplusplus
extern "C" {
#endif

typedef enum rtems_blkdev_request_op {
  RTEMS_BLKDEV_REQ_READ,       
  RTEMS_BLKDEV_REQ_WRITE,      
  RTEMS_BLKDEV_REQ_SYNC        
} rtems_blkdev_request_op;

struct rtems_blkdev_request;

typedef void (*rtems_blkdev_request_cb)(
  struct rtems_blkdev_request *req,
  rtems_status_code status
);

typedef struct rtems_blkdev_sg_buffer {
  rtems_blkdev_bnum block;

  uint32_t length;

  void *buffer;

  void *user;
} rtems_blkdev_sg_buffer;

typedef struct rtems_blkdev_request {
  rtems_blkdev_request_op req;

  rtems_blkdev_request_cb done;

  void *done_arg;

  rtems_status_code status;

  uint32_t bufnum;

  rtems_id io_task;

  /*
   * TODO: The use of these req blocks is not a great design. The req is a
   *       struct with a single 'bufs' declared in the req struct and the
   *       others are added in the outer level struct. This relies on the
   *       structs joining as a single array and that assumes the compiler
   *       packs the structs. Why not just place on a list ? The BD has a
   *       node that can be used.
   */

  rtems_blkdev_sg_buffer bufs[RTEMS_ZERO_LENGTH_ARRAY];
} rtems_blkdev_request;

static inline void rtems_blkdev_request_done(
  rtems_blkdev_request *req,
  rtems_status_code status
)
{
  (*req->done)(req, status);
}

#define RTEMS_BLKDEV_START_BLOCK(req) (req->bufs[0].block)

#define RTEMS_BLKIO_REQUEST         _IOWR('B', 1, rtems_blkdev_request)
#define RTEMS_BLKIO_GETMEDIABLKSIZE _IOR('B', 2, uint32_t)
#define RTEMS_BLKIO_GETBLKSIZE      _IOR('B', 3, uint32_t)
#define RTEMS_BLKIO_SETBLKSIZE      _IOW('B', 4, uint32_t)
#define RTEMS_BLKIO_GETSIZE         _IOR('B', 5, rtems_blkdev_bnum)
#define RTEMS_BLKIO_SYNCDEV         _IO('B', 6)
#define RTEMS_BLKIO_DELETED         _IO('B', 7)
#define RTEMS_BLKIO_CAPABILITIES    _IO('B', 8)
#define RTEMS_BLKIO_GETDISKDEV      _IOR('B', 9, rtems_disk_device *)
#define RTEMS_BLKIO_PURGEDEV        _IO('B', 10)
#define RTEMS_BLKIO_GETDEVSTATS     _IOR('B', 11, rtems_blkdev_stats *)
#define RTEMS_BLKIO_RESETDEVSTATS   _IO('B', 12)

static inline int rtems_disk_fd_get_media_block_size(
  int fd,
  uint32_t *media_block_size
)
{
  return ioctl(fd, RTEMS_BLKIO_GETMEDIABLKSIZE, media_block_size);
}

static inline int rtems_disk_fd_get_block_size(int fd, uint32_t *block_size)
{
  return ioctl(fd, RTEMS_BLKIO_GETBLKSIZE, block_size);
}

static inline int rtems_disk_fd_set_block_size(int fd, uint32_t block_size)
{
  return ioctl(fd, RTEMS_BLKIO_SETBLKSIZE, &block_size);
}

static inline int rtems_disk_fd_get_block_count(
  int fd,
  rtems_blkdev_bnum *block_count
)
{
  return ioctl(fd, RTEMS_BLKIO_GETSIZE, block_count);
}

static inline int rtems_disk_fd_get_disk_device(
  int fd,
  rtems_disk_device **dd_ptr
)
{
  return ioctl(fd, RTEMS_BLKIO_GETDISKDEV, dd_ptr);
}

static inline int rtems_disk_fd_sync(int fd)
{
  return ioctl(fd, RTEMS_BLKIO_SYNCDEV);
}

static inline int rtems_disk_fd_purge(int fd)
{
  return ioctl(fd, RTEMS_BLKIO_PURGEDEV);
}

static inline int rtems_disk_fd_get_device_stats(
  int fd,
  rtems_blkdev_stats *stats
)
{
  return ioctl(fd, RTEMS_BLKIO_GETDEVSTATS, stats);
}

static inline int rtems_disk_fd_reset_device_stats(int fd)
{
  return ioctl(fd, RTEMS_BLKIO_RESETDEVSTATS);
}

#define RTEMS_BLKDEV_CAP_MULTISECTOR_CONT (1 << 0)

#define RTEMS_BLKDEV_CAP_SYNC (1 << 1)

int
rtems_blkdev_ioctl(rtems_disk_device *dd, uint32_t req, void *argp);

rtems_status_code rtems_blkdev_create(
  const char *device,
  uint32_t media_block_size,
  rtems_blkdev_bnum media_block_count,
  rtems_block_device_ioctl handler,
  void *driver_data
);

rtems_status_code rtems_blkdev_create_partition(
  const char *partition,
  const char *parent_block_device,
  rtems_blkdev_bnum media_block_begin,
  rtems_blkdev_bnum media_block_count
);

void rtems_blkdev_print_stats(
  const rtems_blkdev_stats *stats,
  rtems_printk_plugin_t print,
  void *print_arg
);

void rtems_blkstats(
  FILE *output,
  const char *device,
  bool reset
);

#define RTEMS_GENERIC_BLOCK_DEVICE_DRIVER_ENTRIES \
  rtems_blkdev_generic_open, \
  rtems_blkdev_generic_close, \
  rtems_blkdev_generic_read, \
  rtems_blkdev_generic_write, \
  rtems_blkdev_generic_ioctl

rtems_device_driver
rtems_blkdev_generic_read(
    rtems_device_major_number major,
    rtems_device_minor_number minor,
    void                    * arg
);

rtems_device_driver
rtems_blkdev_generic_write(
    rtems_device_major_number major,
    rtems_device_minor_number minor,
    void                    * arg
);

rtems_device_driver
rtems_blkdev_generic_open(
    rtems_device_major_number major,
    rtems_device_minor_number minor,
    void                    * arg
);

rtems_device_driver
rtems_blkdev_generic_close(
    rtems_device_major_number major,
    rtems_device_minor_number minor,
    void                    * arg
);

rtems_device_driver
rtems_blkdev_generic_ioctl(
    rtems_device_major_number major,
    rtems_device_minor_number minor,
    void                    * arg
);

extern const rtems_driver_address_table rtems_blkdev_generic_ops;

#ifdef __cplusplus
}
#endif

#endif