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lxdream.org :: lxdream/src/gdrom/ide.h
lxdream 0.9.1
released Jun 29
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filename src/gdrom/ide.h
changeset 149:d88dd2e9a190
prev142:2f631c3a3946
next152:d42a4c5cc709
author nkeynes
date Sat May 20 06:24:49 2006 +0000 (14 years ago)
permissions -rw-r--r--
last change Add disc info + spin up (probably seek) commands
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     1 /**
     2  * $Id: ide.h,v 1.7 2006-05-20 06:24:49 nkeynes Exp $
     3  *
     4  * This file defines the interface and structures of the dreamcast's IDE 
     5  * port. Note that the register definitions are in asic.h, as the registers
     6  * fall into the general ASIC ranges (and I don't want to use smaller pages
     7  * at this stage). The registers here are exactly as per the ATA 
     8  * specifications, which makes things a little easier.
     9  *
    10  * Copyright (c) 2005 Nathan Keynes.
    11  *
    12  * This program is free software; you can redistribute it and/or modify
    13  * it under the terms of the GNU General Public License as published by
    14  * the Free Software Foundation; either version 2 of the License, or
    15  * (at your option) any later version.
    16  *
    17  * This program is distributed in the hope that it will be useful,
    18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
    19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    20  * GNU General Public License for more details.
    21  */
    23 #ifndef dream_ide_H
    24 #define dream_ide_H 1
    26 #include "dream.h"
    28 struct ide_registers {
    29     uint8_t status;  /* A05F709C + A05F7018 Read-only */
    30     uint8_t control; /* A05F7018 Write-only 01110 */
    31     uint8_t error;   /* A05F7084 Read-only  10001 */
    32     uint8_t feature; /* A05F7084 Write-only 10001 */
    33     uint8_t count;   /* A05F7088 Read/Write 10010 */
    34     uint8_t disc;    /* A05F708C Read-only 10011 */
    35     uint8_t lba0;    /* A05F708C Write-only 10011 (NB: Presumed, TBV */
    36     uint8_t lba1;    /* A05F7090 Read/Write 10100 */
    37     uint8_t lba2;    /* A05F7094 Read/Write 10101 */
    38     uint8_t device;  /* A05F7098 Read/Write 10110 */
    39     uint8_t command; /* A05F709C Write-only 10111 */
    40     uint8_t intrq_pending; /* Flag to indicate if the INTRQ line is active */
    42     /* We don't keep the data register per se, rather the currently pending
    43      * data is kept here and read out a byte at a time (in PIO mode) or all at
    44      * once (in DMA mode). The IDE routines are responsible for managing this
    45      * memory. If dataptr == NULL, there is no data available.
    46      */
    47     unsigned char *data;
    48     uint16_t *readptr, *writeptr;
    49     uint16_t gdrom_error; /* Lo-byte = error code, Hi-byte = subcode */
    50     int datalen;
    51     int blocksize; /* Used to determine the transfer unit size */
    52     int blockleft; /* Bytes remaining in the current block */
    53 };
    55 #define IDE_ST_BUSY  0x80
    56 #define IDE_ST_READY 0x40
    57 #define IDE_ST_SERV  0x10
    58 #define IDE_ST_DATA  0x08
    59 #define IDE_ST_ERROR 0x01
    61 #define IDE_FEAT_DMA 0x01
    62 #define IDE_FEAT_OVL 0x02
    64 #define IDE_COUNT_CD 0x01
    65 #define IDE_COUNT_IO 0x02
    66 #define IDE_COUNT_REL 0x04
    69 #define IDE_CTL_RESET 0x04
    70 #define IDE_CTL_IRQEN 0x02 /* IRQ enabled when == 0 */
    72 #define IDE_CMD_RESET_DEVICE 0x08
    73 #define IDE_CMD_PACKET 0xA0
    74 #define IDE_CMD_IDENTIFY_PACKET_DEVICE 0xA1
    75 #define IDE_CMD_SERVICE 0xA2
    76 #define IDE_CMD_SET_FEATURE 0xEF
    78 #define IDE_FEAT_SET_TRANSFER_MODE 0x03
    79 #define IDE_XFER_PIO        0x00
    80 #define IDE_XFER_PIO_FLOW   0x08
    81 #define IDE_XFER_MULTI_DMA  0x20
    82 #define IDE_XFER_ULTRA_DMA  0x40
    84 extern struct ide_registers idereg;
    86 /* Note: control can be written at any time - all other registers are writable
    87  * only when ide_can_write_regs() is true
    88  */
    89 #define ide_can_write_regs() ((idereg.status&0x88)==0)
    90 #define IS_IDE_IRQ_ENABLED() ((idereg.control&0x02)==0)
    93 uint16_t ide_read_data_pio(void);
    94 uint8_t ide_read_status(void);
    95 void ide_write_data_pio( uint16_t value );
    96 void ide_write_buffer( unsigned char *data, int length ); 
    98 void ide_write_command( uint8_t command );
    99 void ide_write_control( uint8_t value );
   100 #endif
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