1 /* SPDX-License-Identifier: GPL-2.0 */ <<
2 #ifndef _MC6821_H_ 1 #ifndef _MC6821_H_
3 #define _MC6821_H_ 2 #define _MC6821_H_
4 3
5 /* 4 /*
6 * This file describes the memery mapping of t 5 * This file describes the memery mapping of the MC6821 PIA.
7 * The unions describe overlayed registers. Wh 6 * The unions describe overlayed registers. Which of them is used is
8 * determined by bit 2 of the corresponding co 7 * determined by bit 2 of the corresponding control register.
9 * this files expects the PIA_REG_PADWIDTH to 8 * this files expects the PIA_REG_PADWIDTH to be defined the numeric
10 * value of the register spacing. 9 * value of the register spacing.
11 * 10 *
12 * Data came from MFC-31-Developer Kit (from R 11 * Data came from MFC-31-Developer Kit (from Ralph Seidel,
13 * zodiac@darkness.gun.de) and Motorola Data S 12 * zodiac@darkness.gun.de) and Motorola Data Sheet (from
14 * Richard Hirst, srh@gpt.co.uk) 13 * Richard Hirst, srh@gpt.co.uk)
15 * 14 *
16 * 6.11.95 copyright Joerg Dorchain (dorchain@ 15 * 6.11.95 copyright Joerg Dorchain (dorchain@mpi-sb.mpg.de)
17 * 16 *
18 */ 17 */
19 18
20 #ifndef PIA_REG_PADWIDTH 19 #ifndef PIA_REG_PADWIDTH
21 #define PIA_REG_PADWIDTH 255 20 #define PIA_REG_PADWIDTH 255
22 #endif 21 #endif
23 22
24 struct pia { 23 struct pia {
25 union { 24 union {
26 volatile u_char pra; 25 volatile u_char pra;
27 volatile u_char ddra; 26 volatile u_char ddra;
28 } ua; 27 } ua;
29 u_char pad1[PIA_REG_PADWIDTH]; 28 u_char pad1[PIA_REG_PADWIDTH];
30 volatile u_char cra; 29 volatile u_char cra;
31 u_char pad2[PIA_REG_PADWIDTH]; 30 u_char pad2[PIA_REG_PADWIDTH];
32 union { 31 union {
33 volatile u_char prb; 32 volatile u_char prb;
34 volatile u_char ddrb; 33 volatile u_char ddrb;
35 } ub; 34 } ub;
36 u_char pad3[PIA_REG_PADWIDTH]; 35 u_char pad3[PIA_REG_PADWIDTH];
37 volatile u_char crb; 36 volatile u_char crb;
38 u_char pad4[PIA_REG_PADWIDTH]; 37 u_char pad4[PIA_REG_PADWIDTH];
39 }; 38 };
40 39
41 #define ppra ua.pra 40 #define ppra ua.pra
42 #define pddra ua.ddra 41 #define pddra ua.ddra
43 #define pprb ub.prb 42 #define pprb ub.prb
44 #define pddrb ub.ddrb 43 #define pddrb ub.ddrb
45 44
46 #define PIA_C1_ENABLE_IRQ (1<<0) 45 #define PIA_C1_ENABLE_IRQ (1<<0)
47 #define PIA_C1_LOW_TO_HIGH (1<<1) 46 #define PIA_C1_LOW_TO_HIGH (1<<1)
48 #define PIA_DDR (1<<2) 47 #define PIA_DDR (1<<2)
49 #define PIA_IRQ2 (1<<6) 48 #define PIA_IRQ2 (1<<6)
50 #define PIA_IRQ1 (1<<7) 49 #define PIA_IRQ1 (1<<7)
51 50
52 #endif 51 #endif
53 52
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