source: xtideuniversalbios/trunk/XTIDE_Universal_BIOS/Inc/Controllers/XTCF.inc@ 489

; Project name  :   XTIDE Universal BIOS
; Description   :   Lo-tech XT-CFv2 board specifications.
;
;                   More information at http://www.lo-tech.co.uk/wiki/Lo-tech_XT-CFv2_Board

;
; XTIDE Universal BIOS and Associated Tools 
; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2012 by XTIDE Universal BIOS Team.
;
; This program is free software; you can redistribute it and/or modify
; it under the terms of the GNU General Public License as published by
; the Free Software Foundation; either version 2 of the License, or
; (at your option) any later version.
; 
; This program is distributed in the hope that it will be useful,
; but WITHOUT ANY WARRANTY; without even the implied warranty of
; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
; GNU General Public License for more details.      
; Visit http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
;

%ifndef XTCF_INC
%define XTCF_INC

OFFSET_TO_CONTROL_BLOCK_REGISTERS   EQU     8
DEFAULT_XTCF_SECTOR_WINDOW_SEGMENT  EQU     0D800h

; XT-CF requires that block must be less than 128 sectors (64 kiB).
; Instead of limiting block size to 64, we limit it to 32 (16 kiB).
; Transferring more than 16 kiB with 8237 DMA controller block or demand
; mode might interfere with DRAM refresh on XT systems.
XTCF_DMA_MODE_MAX_BLOCK_SIZE        EQU     32      ; Sectors

; Possible base addresses. Note that all XT-CF IDE registers are SHL 1 compared
; to standard IDE registers.
XTCF_BASE_PORT_1                    EQU     200h
XTCF_BASE_PORT_2                    EQU     240h
XTCF_BASE_PORT_3                    EQU     300h    ; Default setting
XTCF_BASE_PORT_4                    EQU     340h


; XT-CF Control Register (do not SHL 1 these!)
XTCF_CONTROL_REGISTER               EQU     1Fh
XTCT_CONTROL_REGISTER_INVERTED_in   EQU     1Eh

; Control Register contents:
;
; Control Register holds high byte from Sector Window segment if >= A0h
; (First possible segment for Sector Window is A000h)
; 
; 8-bit PIO transfers (port I/O) are used if Control Register is zero.
; Any other value means DMA transfers (using DMA channel 3).
XTCF_8BIT_PIO_MODE                      EQU     0
XTCF_DMA_MODE                           EQU     10h
XTCF_MEMORY_MAPPED_MODE                 EQU     0A0h
RAISE_DRQ_AND_CLEAR_XTCF_XFER_COUNTER   EQU     40h



; Subcommands for AH=1Eh, Lo-tech XT-CF features.
; Return values common for all subcommands:
;       AH:     RET_HD_SUCCESS if drive is XT-CF
;               RET_HD_INVALID if drive is not XT-CF
;       CF:     0 if successful, 1 if error

;--------------------------------------------------------------------
; IS_THIS_DRIVE_XTCF
;   Parameters:
;       DL:     Drive Number
;--------------------------------------------------------------------
IS_THIS_DRIVE_XTCF                  EQU     0

;--------------------------------------------------------------------
; READ_XTCF_CONTROL_REGISTER_TO_DH
;   Parameters:
;       DL:     Drive Number
;   Returns:
;       DH:     XT-CF Control Register contents
;--------------------------------------------------------------------
READ_XTCF_CONTROL_REGISTER_TO_DH    EQU     1

;--------------------------------------------------------------------
; WRITE_DH_TO_XTCF_CONTROL_REGISTER
;   Parameters:
;       DH:     Byte to write to XT-CF Control Register
;       DL:     Drive Number
;--------------------------------------------------------------------
WRITE_DH_TO_XTCF_CONTROL_REGISTER   EQU     2


%endif ; XTCF_INC