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1 | #ifndef _MC6821_H_ |
2 | #define _MC6821_H_ |
3 | |
4 | /* |
5 | * This file describes the memery mapping of the MC6821 PIA. |
6 | * The unions describe overlayed registers. Which of them is used is |
7 | * determined by bit 2 of the corresponding control register. |
8 | * this files expects the PIA_REG_PADWIDTH to be defined the numeric |
9 | * value of the register spacing. |
10 | * |
11 | * Data came from MFC-31-Developer Kit (from Ralph Seidel, |
12 | * zodiac@darkness.gun.de) and Motorola Data Sheet (from |
13 | * Richard Hirst, srh@gpt.co.uk) |
14 | * |
15 | * 6.11.95 copyright Joerg Dorchain (dorchain@mpi-sb.mpg.de) |
16 | * |
17 | */ |
18 | |
19 | #ifndef PIA_REG_PADWIDTH |
20 | #define PIA_REG_PADWIDTH 255 |
21 | #endif |
22 | |
23 | struct pia { |
24 | union { |
25 | volatile u_char pra; |
26 | volatile u_char ddra; |
27 | } ua; |
28 | u_char pad1[PIA_REG_PADWIDTH]; |
29 | volatile u_char cra; |
30 | u_char pad2[PIA_REG_PADWIDTH]; |
31 | union { |
32 | volatile u_char prb; |
33 | volatile u_char ddrb; |
34 | } ub; |
35 | u_char pad3[PIA_REG_PADWIDTH]; |
36 | volatile u_char crb; |
37 | u_char pad4[PIA_REG_PADWIDTH]; |
38 | }; |
39 | |
40 | #define ppra ua.pra |
41 | #define pddra ua.ddra |
42 | #define pprb ub.prb |
43 | #define pddrb ub.ddrb |
44 | |
45 | #define PIA_C1_ENABLE_IRQ (1<<0) |
46 | #define PIA_C1_LOW_TO_HIGH (1<<1) |
47 | #define PIA_DDR (1<<2) |
48 | #define PIA_IRQ2 (1<<6) |
49 | #define PIA_IRQ1 (1<<7) |
50 | |
51 | #endif |
52 |
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