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 AH1Eh_XTCF.asm). |
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57 | ; |
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58 | XTCF_8BIT_PIO_MODE EQU 0 ; XT-CF using 8-bit PIO mode |
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59 | XTCF_8BIT_PIO_MODE_WITH_BIU_OFFLOAD EQU 1 ; XT-CF using 8-bit PIO mode, but with 16-bit instructions |
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60 | XTCF_16BIT_PIO_MODE_WITH_BIU_OFFLOAD EQU 2 ; Lo-tech 8-bit IDE Adapter |
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61 | XTCF_DMA_MODE EQU 3 ; XT-CFv3 using DMA |
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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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