| 1 | ; Project name : XTIDE Universal BIOS |
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| 2 | ; Description : Lo-tech XT-CF board specifications. |
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| 3 | ; |
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| 4 | ; More information at http://www.lo-tech.co.uk/XT-CF |
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| 5 | |
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| 6 | ; |
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| 7 | ; XTIDE Universal BIOS and Associated Tools |
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| 8 | ; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2013 by XTIDE Universal BIOS Team. |
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| 9 | ; |
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| 10 | ; This program is free software; you can redistribute it and/or modify |
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| 11 | ; it under the terms of the GNU General Public License as published by |
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| 12 | ; the Free Software Foundation; either version 2 of the License, or |
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| 13 | ; (at your option) any later version. |
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| 14 | ; |
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| 15 | ; This program is distributed in the hope that it will be useful, |
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| 16 | ; but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 17 | ; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 18 | ; GNU General Public License for more details. |
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| 19 | ; Visit http://www.gnu.org/licenses/old-licenses/gpl-2.0.html |
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| 20 | ; |
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| 21 | |
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| 22 | %ifndef XTCF_INC |
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| 23 | %define XTCF_INC |
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| 24 | |
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| 25 | ; XT-CF requires that block must be less than 128 sectors (64 kiB) for DMA transfers. |
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| 26 | ; |
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| 27 | ; Note: XT-CFv3 DMA will not interfere with PC & PC/XT memory refresh, |
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| 28 | ; since the XT-CFv3 detaches itself from the bus every 16 bytes transferred. |
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| 29 | ; |
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| 30 | XTCF_DMA_MODE_MAX_BLOCK_SIZE EQU 64 ; Sectors |
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| 31 | |
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| 32 | ; Possible base addresses. Note that all XT-CF IDE registers are SHL 1 compared |
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| 33 | ; to standard IDE registers. |
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| 34 | XTCF_BASE_PORT_1 EQU 200h |
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| 35 | XTCF_BASE_PORT_2 EQU 240h |
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| 36 | XTCF_BASE_PORT_3 EQU 300h ; Default setting |
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| 37 | XTCF_BASE_PORT_4 EQU 340h |
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| 38 | |
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| 39 | |
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| 40 | ; XT-CF Control Register (do not SHL 1 these!) |
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| 41 | ; Note: XT-CFv3 control register is used *only* to raise DRQ. The register cannot be read. |
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| 42 | ; |
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| 43 | XTCF_CONTROL_REGISTER EQU 1Eh |
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| 44 | |
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| 45 | ; Transfer Mode Constants |
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| 46 | ; |
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| 47 | ; Available transfer modes depend on the controller. All XT-CF controllers |
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| 48 | ; support 8-bit PIO, either with 8-bit or 16-bit instructions (i.e., data |
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| 49 | ; can be fetched from the controller with REP INSW or REP INSB since A0 is |
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| 50 | ; not decoded). However, errors in the implementation of the BIU on some |
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| 51 | ; machines will prevent 16-bit instructions delivering data correctly. |
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| 52 | ; |
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| 53 | ; For XT-CFv3 adapter, DMA transfers are also supported via channel 3. |
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| 54 | ; |
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| 55 | ; XT-CFv3 cannot be distinguished by software, so user must decide and set |
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| 56 | ; the mode via a call to Int 13h function 1Eh accordingly (see AH1E_XTCF.asm). |
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| 57 | ; |
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| 58 | XTCF_8BIT_PIO_MODE EQU ((DEVICE_8BIT_XTCF_PIO8 >> 1) - XTCF_DEVICE_OFFSET) |
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| 59 | XTCF_8BIT_PIO_MODE_WITH_BIU_OFFLOAD EQU (XTCF_8BIT_PIO_MODE + 1) |
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| 60 | XTCF_16BIT_PIO_WITH_BIU_OFFLOAD EQU (XTCF_8BIT_PIO_MODE + 2) ; Lo-tech 8-bit IDE Adapter |
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| 61 | XTCF_DMA_MODE EQU (XTCF_8BIT_PIO_MODE + 3) |
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| 62 | |
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| 63 | |
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| 64 | ; Subcommands for AH=1Eh, Lo-tech XT-CF features. |
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| 65 | ; Return values common for all subcommands: |
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| 66 | ; AH: RET_HD_SUCCESS if drive is XT-CF |
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| 67 | ; RET_HD_INVALID if drive is not XT-CF |
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| 68 | ; CF: 0 if successful, 1 if error |
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| 69 | |
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| 70 | ;-------------------------------------------------------------------- |
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| 71 | ; IS_THIS_DRIVE_XTCF |
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| 72 | ; Parameters: |
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| 73 | ; DL: Drive Number |
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| 74 | ;-------------------------------------------------------------------- |
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| 75 | IS_THIS_DRIVE_XTCF EQU 0 |
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| 76 | |
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| 77 | ;-------------------------------------------------------------------- |
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| 78 | ; SET_XTCF_TRANSFER_MODE |
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| 79 | ; Parameters: |
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| 80 | ; DH: Mode to select, i.e. XTCF_8BIT_PIO_MODE |
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| 81 | ; Note there's no way to know if an XT-CF adapter |
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| 82 | ; supports DMA, so the user should enable DMA |
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| 83 | ; only if a DMA-enabled XT-CFv3 is fitted. |
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| 84 | ; DL: Drive Number |
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| 85 | ;-------------------------------------------------------------------- |
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| 86 | SET_XTCF_TRANSFER_MODE EQU 1 |
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| 87 | |
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| 88 | ;-------------------------------------------------------------------- |
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| 89 | ; GET_XTCF_TRANSFER_MODE |
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| 90 | ; Parameters: |
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| 91 | ; DL: Drive Number |
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| 92 | ; Returns: |
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| 93 | ; DH: One of the mode values listed above, |
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| 94 | ; i.e. XTCF_8BIT_PIO_MODE |
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| 95 | ; DL: Block mode sectors per block configured |
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| 96 | ;-------------------------------------------------------------------- |
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| 97 | GET_XTCF_TRANSFER_MODE EQU 2 |
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| 98 | |
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| 99 | |
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| 100 | %endif ; XTCF_INC |
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