source: mainline/uspace/srv/bd/ata_bd/ata_bd.h@ d9f4c76

/*
 * Copyright (c) 2009 Jiri Svoboda
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/** @addtogroup bd
 * @{
 */
/** @file
 */

#ifndef __ATA_BD_H__
#define __ATA_BD_H__

#include <sys/types.h>

enum {
        CTL_READ_START  = 0,
        CTL_WRITE_START = 1,
};

enum {
        STATUS_FAILURE  = 0
};

enum {
        MAX_DISKS       = 2
};

typedef union {
        /* Read */
        struct {
                uint8_t data_port;
                uint8_t error;
                uint8_t sector_count;
                uint8_t sector_number;
                uint8_t cylinder_low;
                uint8_t cylinder_high;
                uint8_t drive_head;
                uint8_t status;
        };

        /* Write */
        struct {
                uint8_t pad0[7];
                uint8_t command;
        };
} ata_cmd_t;

typedef union {
        /* Read */
        struct {
                uint8_t pad0[6];
                uint8_t alt_status;
                uint8_t drive_address;
        };

        /* Write */
        struct {
                uint8_t pad1[6];
                uint8_t device_control;
                uint8_t pad2;
        };
} ata_ctl_t;

enum devctl_bits {
        DCR_SRST        = 0x04, /**< Software Reset */
        DCR_nIEN        = 0x02  /**< Interrupt Enable (negated) */
};

enum status_bits {
        SR_BSY          = 0x80, /**< Busy */
        SR_DRDY         = 0x40, /**< Drive Ready */
        SR_DWF          = 0x20, /**< Drive Write Fault */
        SR_DSC          = 0x10, /**< Drive Seek Complete */
        SR_DRQ          = 0x08, /**< Data Request */
        SR_CORR         = 0x04, /**< Corrected Data */
        SR_IDX          = 0x02, /**< Index */
        SR_ERR          = 0x01  /**< Error */
};

enum drive_head_bits {
        DHR_DRV         = 0x10
};

enum error_bits {
        ER_BBK          = 0x80, /**< Bad Block Detected */
        ER_UNC          = 0x40, /**< Uncorrectable Data Error */
        ER_MC           = 0x20, /**< Media Changed */
        ER_IDNF         = 0x10, /**< ID Not Found */
        ER_MCR          = 0x08, /**< Media Change Request */
        ER_ABRT         = 0x04, /**< Aborted Command */
        ER_TK0NF        = 0x02, /**< Track 0 Not Found */
        ER_AMNF         = 0x01  /**< Address Mark Not Found */
};

enum ata_command {
        CMD_IDENTIFY_DRIVE      = 0xEC,
        CMD_READ_SECTORS        = 0x20,
        CMD_WRITE_SECTORS       = 0x30
};

typedef struct {
        bool present;
        unsigned heads;
        unsigned cylinders;
        unsigned sectors;
        uint64_t blocks;
} disk_t;

#endif

/** @}
 */