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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 257:62fa1cabc46c
prev254:7c9e34c37670
next342:850502f0e8de
author nkeynes
date Fri Dec 29 00:21:46 2006 +0000 (13 years ago)
permissions -rw-r--r--
last change Fix comment for the IO bit
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     1 /**
     2  * $Id: ide.h,v 1.12 2006-12-29 00:21:46 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     /* IDE interface registers */
    30     uint8_t status;  /* A05F709C + A05F7018 Read-only */
    31     uint8_t control; /* A05F7018 Write-only 01110 */
    32     uint8_t error;   /* A05F7084 Read-only  10001 */
    33     uint8_t feature; /* A05F7084 Write-only 10001 */
    34     uint8_t count;   /* A05F7088 Read/Write 10010 */
    35     uint8_t disc;    /* A05F708C Read-only 10011 */
    36     uint8_t lba0;    /* A05F708C Write-only 10011 (NB: Presumed, TBV */
    37     uint8_t lba1;    /* A05F7090 Read/Write 10100 */
    38     uint8_t lba2;    /* A05F7094 Read/Write 10101 */
    39     uint8_t device;  /* A05F7098 Read/Write 10110 */
    40     uint8_t command; /* A05F709C Write-only 10111 */
    42     /* Internal IDE state */
    43     uint8_t intrq_pending; /* Flag to indicate if the INTRQ line is active */
    44     gboolean interface_enabled;
    45     gboolean was_reset; /* Flag indicating that the device has just been reset */
    46     int state;
    48     /* Sense response for the last executed packet command */
    49     unsigned char gdrom_sense[10];
    52     /* offset in the buffer of the next word to read/write, or -1
    53      * if inactive.
    54      */ 
    55     int data_offset;
    56     int data_length;
    58     int block_length; /* Used to determine the transfer unit size */
    59     int block_left; /* Bytes remaining in the current block */
    61     /* Status reporting information */
    62     uint8_t last_read_track;
    63     uint32_t last_read_lba;
    64 };
    66 #define IDE_STATE_IDLE      0 
    67 #define IDE_STATE_CMD_WRITE 1
    68 #define IDE_STATE_PIO_READ  2
    69 #define IDE_STATE_PIO_WRITE 3
    70 #define IDE_STATE_DMA_READ  4
    71 #define IDE_STATE_DMA_WRITE 5
    72 #define IDE_STATE_BUSY      6
    74 /* Flag bits */
    75 #define IDE_STATUS_BSY  0x80    /* Busy */
    76 #define IDE_STATUS_DRDY 0x40    /* Device ready */
    77 #define IDE_STATUS_DMRD 0x20    /* DMA Request */
    78 #define IDE_STATUS_SERV 0x10   
    79 #define IDE_STATUS_DRQ  0x08
    80 #define IDE_STATUS_CHK  0x01    /* Check condition (ie error) */
    82 #define IDE_FEAT_DMA 0x01
    83 #define IDE_FEAT_OVL 0x02
    85 #define IDE_COUNT_CD 0x01       /* Command (1)/Data (0) */
    86 #define IDE_COUNT_IO 0x02       /* Input (1)/Output (0) */
    87 #define IDE_COUNT_REL 0x04      /* Release device */
    90 #define IDE_CTL_RESET 0x04
    91 #define IDE_CTL_IRQEN 0x02 /* IRQ enabled when == 0 */
    93 #define IDE_CMD_NOP 0x00
    94 #define IDE_CMD_RESET_DEVICE 0x08
    95 #define IDE_CMD_PACKET 0xA0
    96 #define IDE_CMD_IDENTIFY_PACKET_DEVICE 0xA1
    97 #define IDE_CMD_SERVICE 0xA2
    98 #define IDE_CMD_SET_FEATURE 0xEF
   100 #define IDE_FEAT_SET_TRANSFER_MODE 0x03
   101 #define IDE_XFER_PIO        0x00
   102 #define IDE_XFER_PIO_FLOW   0x08
   103 #define IDE_XFER_MULTI_DMA  0x20
   104 #define IDE_XFER_ULTRA_DMA  0x40
   106 extern struct ide_registers idereg;
   108 /* Note: control can be written at any time - all other registers are writable
   109  * only when ide_can_write_regs() is true
   110  */
   111 #define ide_can_write_regs() ((idereg.status&0x80)==0)
   112 #define IS_IDE_IRQ_ENABLED() ((idereg.control&0x02)==0)
   115 uint16_t ide_read_data_pio(void);
   116 void ide_write_data_pio( uint16_t value );
   117 uint32_t ide_read_data_dma( uint32_t addr, uint32_t length );
   118 uint8_t ide_read_status(void);
   119 void ide_write_buffer( unsigned char *data, int length ); 
   121 void ide_write_command( uint8_t command );
   122 void ide_write_control( uint8_t value );
   124 void ide_dma_read_req( uint32_t addr, uint32_t length );
   125 #endif
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