4.104.114.84.95
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1 | /* |
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2 | * This file contains a typical set of register access routines which may be |
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3 | * used with the mc68681 chip if accesses to the chip are as follows: |
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4 | * |
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5 | * + registers are accessed as bytes |
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6 | * + registers are only byte-aligned (no address gaps) |
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7 | * |
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8 | * COPYRIGHT (c) 1989-1997. |
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9 | * On-Line Applications Research Corporation (OAR). |
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10 | * |
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11 | * The license and distribution terms for this file may be |
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12 | * found in the file LICENSE in this distribution or at |
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13 | * http://www.rtems.com/license/LICENSE. |
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14 | * |
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15 | * $Id$ |
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16 | */ |
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17 | |
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18 | #include <rtems.h> |
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19 | |
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20 | #ifndef _MC68681_MULTIPLIER |
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21 | #define _MC68681_MULTIPLIER 1 |
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22 | #define _MC68681_NAME(_X) _X |
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23 | #define _MC68681_TYPE uint8_t |
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24 | #endif |
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25 | |
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26 | #define CALCULATE_REGISTER_ADDRESS( _base, _reg ) \ |
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27 | (_MC68681_TYPE *)((_base) + ((_reg) * _MC68681_MULTIPLIER )) |
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28 | |
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29 | /* |
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30 | * MC68681 Get Register Routine |
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31 | */ |
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32 | |
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33 | uint8_t _MC68681_NAME(mc68681_get_register)( |
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34 | uint32_t ulCtrlPort, |
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35 | uint8_t ucRegNum |
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36 | ) |
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37 | { |
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38 | _MC68681_TYPE *port; |
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39 | |
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40 | port = CALCULATE_REGISTER_ADDRESS( ulCtrlPort, ucRegNum ); |
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41 | |
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42 | return *port; |
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43 | } |
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44 | |
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45 | /* |
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46 | * MC68681 Set Register Routine |
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47 | */ |
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48 | |
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49 | void _MC68681_NAME(mc68681_set_register)( |
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50 | uint32_t ulCtrlPort, |
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51 | uint8_t ucRegNum, |
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52 | uint8_t ucData |
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53 | ) |
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54 | { |
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55 | _MC68681_TYPE *port; |
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56 | |
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57 | port = CALCULATE_REGISTER_ADDRESS( ulCtrlPort, ucRegNum ); |
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58 | |
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59 | *port = ucData; |
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60 | } |
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