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