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4507 svoboda 1
/*
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 * Copyright (c) 2009 Jiri Svoboda
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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/** @addtogroup bd
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 * @{
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 */
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/** @file
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 */
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#ifndef __ATA_BD_H__
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#define __ATA_BD_H__
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#include <sys/types.h>
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enum {
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    CTL_READ_START  = 0,
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    CTL_WRITE_START = 1,
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};
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enum {
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    STATUS_FAILURE  = 0
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};
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enum {
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    MAX_DISKS   = 2
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};
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/** ATA Command Register Block. */
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typedef union {
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    /* Read/Write */
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    struct {
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        uint16_t data_port;
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        uint8_t sector_count;
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        uint8_t sector_number;
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        uint8_t cylinder_low;
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        uint8_t cylinder_high;
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        uint8_t drive_head;
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        uint8_t pad_rw0;       
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    };
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    /* Read Only */
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    struct {
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        uint8_t pad_ro0;
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        uint8_t error;
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        uint8_t pad_ro1[5];
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        uint8_t status;
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    };
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    /* Write Only */
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    struct {
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        uint8_t pad_wo0;
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        uint8_t features;
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        uint8_t pad_wo1[5];
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        uint8_t command;
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    };
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} ata_cmd_t;
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typedef union {
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    /* Read */
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    struct {
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        uint8_t pad0[6];
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        uint8_t alt_status;
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        uint8_t drive_address;
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    };
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    /* Write */
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    struct {
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        uint8_t pad1[6];
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        uint8_t device_control;
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        uint8_t pad2;
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    };
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} ata_ctl_t;
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enum devctl_bits {
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    DCR_SRST    = 0x04, /**< Software Reset */
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    DCR_nIEN    = 0x02  /**< Interrupt Enable (negated) */
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};
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enum status_bits {
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    SR_BSY      = 0x80, /**< Busy */
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    SR_DRDY     = 0x40, /**< Drive Ready */
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    SR_DWF      = 0x20, /**< Drive Write Fault */
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    SR_DSC      = 0x10, /**< Drive Seek Complete */
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    SR_DRQ      = 0x08, /**< Data Request */
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    SR_CORR     = 0x04, /**< Corrected Data */
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    SR_IDX      = 0x02, /**< Index */
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    SR_ERR      = 0x01  /**< Error */
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};
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enum drive_head_bits {
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    DHR_DRV     = 0x10
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};
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enum error_bits {
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    ER_BBK      = 0x80, /**< Bad Block Detected */
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    ER_UNC      = 0x40, /**< Uncorrectable Data Error */
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    ER_MC       = 0x20, /**< Media Changed */
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    ER_IDNF     = 0x10, /**< ID Not Found */
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    ER_MCR      = 0x08, /**< Media Change Request */
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    ER_ABRT     = 0x04, /**< Aborted Command */
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    ER_TK0NF    = 0x02, /**< Track 0 Not Found */
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    ER_AMNF     = 0x01  /**< Address Mark Not Found */
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};
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enum ata_command {
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    CMD_IDENTIFY_DRIVE  = 0xEC,
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    CMD_READ_SECTORS    = 0x20,
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    CMD_WRITE_SECTORS   = 0x30
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};
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typedef struct {
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    bool present;
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    unsigned heads;
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    unsigned cylinders;
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    unsigned sectors;
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    uint64_t blocks;
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} disk_t;
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#endif
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/** @}
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 */