1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/src/gdrom/ide.h	Mon Dec 12 10:37:41 2005 +0000
     1.3 @@ -0,0 +1,91 @@
     1.4 +/*
     1.5 + * ide.h    31 Mar 2004  - IDE Interface definitions
     1.6 + *
     1.7 + * Copyright (c) 2004 Nathan Keynes. Distribution and modification permitted
     1.8 + * under the terms of the GNU General Public License version 2 or later. 
     1.9 + *
    1.10 + * This file defines the interface and structures of the dreamcast's IDE port. 
    1.11 + * Note that the register definitions are in asic.h, as the registers fall into
    1.12 + * the general ASIC ranges (and I don't want to use smaller pages at this
    1.13 + * stage). The registers here are exactly as per the ATA specifications, which
    1.14 + * makes things a little easier.
    1.15 + */
    1.16 +#ifndef dream_ide_H
    1.17 +#define dream_ide_H 1
    1.18 +
    1.19 +#include "dream.h"
    1.20 +
    1.21 +struct ide_registers {
    1.22 +    uint8_t status;  /* A05F709C + A05F7018 Read-only */
    1.23 +    uint8_t control; /* A05F7018 Write-only 01110 */
    1.24 +    uint8_t error;   /* A05F7084 Read-only  10001 */
    1.25 +    uint8_t feature; /* A05F7084 Write-only 10001 */
    1.26 +    uint8_t count;   /* A05F7088 Read/Write 10010 */
    1.27 +    uint8_t disc;    /* A05F708C Read-only 10011 */
    1.28 +    uint8_t lba0;    /* A05F708C Write-only 10011 (NB: Presumed, TBV */
    1.29 +    uint8_t lba1;    /* A05F7090 Read/Write 10100 */
    1.30 +    uint8_t lba2;    /* A05F7094 Read/Write 10101 */
    1.31 +    uint8_t device;  /* A05F7098 Read/Write 10110 */
    1.32 +    uint8_t command; /* A05F709C Write-only 10111 */
    1.33 +
    1.34 +    /* We don't keep the data register per se, rather the currently pending
    1.35 +     * data is kept here and read out a byte at a time (in PIO mode) or all at
    1.36 +     * once (in DMA mode). The IDE routines are responsible for managing this
    1.37 +     * memory. If dataptr == NULL, there is no data available.
    1.38 +     */
    1.39 +    char *data;
    1.40 +    uint16_t *readptr, *writeptr;
    1.41 +    int datalen;
    1.42 +};
    1.43 +
    1.44 +#define IDE_ST_BUSY  0x80
    1.45 +#define IDE_ST_READY 0x40
    1.46 +#define IDE_ST_SERV  0x10
    1.47 +#define IDE_ST_DATA  0x08
    1.48 +#define IDE_ST_ERROR 0x01
    1.49 +
    1.50 +#define IDE_CTL_RESET 0x04
    1.51 +#define IDE_CTL_IRQEN 0x02 /* IRQ enabled when == 0 */
    1.52 +
    1.53 +#define IDE_CMD_RESET_DEVICE 0x08
    1.54 +#define IDE_CMD_PACKET 0xA0
    1.55 +#define IDE_CMD_IDENTIFY_PACKET_DEVICE 0xA1
    1.56 +#define IDE_CMD_SERVICE 0xA2
    1.57 +#define IDE_CMD_SET_FEATURE 0xEF
    1.58 +
    1.59 +/* The disc register indicates the current contents of the drive. When open
    1.60 + * contains 0x06.
    1.61 + */
    1.62 +#define IDE_DISC_AUDIO 0x00
    1.63 +#define IDE_DISC_NONE  0x06
    1.64 +#define IDE_DISC_CDROM 0x20
    1.65 +#define IDE_DISC_GDROM 0x80
    1.66 +#define IDE_DISC_READY 0x01 /* ored with above */
    1.67 +#define IDE_DISC_IDLE  0x02 /* ie spun-down */
    1.68 +
    1.69 +#define PKT_CMD_RESET    0x00 /* Wild-ass guess */
    1.70 +#define PKT_CMD_IDENTIFY 0x11
    1.71 +
    1.72 +extern struct ide_registers idereg;
    1.73 +
    1.74 +/* Note: control can be written at any time - all other registers are writable
    1.75 + * only when ide_can_write_regs() is true
    1.76 + */
    1.77 +#define ide_can_write_regs() ((idereg.status&0x88)==0)
    1.78 +
    1.79 +/* Called upon:
    1.80 + *   a) Writing the command register
    1.81 + *   b) Reading the status (but not altstatus) register
    1.82 + *  (whether this actually has any effect an the ASIC event is TBD)
    1.83 + */
    1.84 +void ide_clear_interrupt(void);
    1.85 +
    1.86 +void ide_reset(void);
    1.87 +
    1.88 +uint16_t ide_read_data_pio(void);
    1.89 +void ide_write_data_pio( uint16_t value );
    1.90 +void ide_write_buffer( char * ); 
    1.91 +
    1.92 +void ide_write_command( uint8_t command );
    1.93 +void ide_write_control( uint8_t value );
    1.94 +#endif