1/* Copyright (c) 2013-2015 Jeffrey Pfau
 2 *
 3 * This Source Code Form is subject to the terms of the Mozilla Public
 4 * License, v. 2.0. If a copy of the MPL was not distributed with this
 5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 6#ifndef GBA_SIO_H
 7#define GBA_SIO_H
 8
 9#include "util/common.h"
10
11#include "core/log.h"
12#include "gba/interface.h"
13
14#define MAX_GBAS 4
15
16extern const int GBASIOCyclesPerTransfer[4][MAX_GBAS];
17
18mLOG_DECLARE_CATEGORY(GBA_SIO);
19
20enum {
21	RCNT_INITIAL = 0x8000
22};
23
24struct GBASIODriverSet {
25	struct GBASIODriver* normal;
26	struct GBASIODriver* multiplayer;
27	struct GBASIODriver* joybus;
28};
29
30struct GBASIO {
31	struct GBA* p;
32
33	enum GBASIOMode mode;
34	struct GBASIODriverSet drivers;
35	struct GBASIODriver* activeDriver;
36
37	uint16_t rcnt;
38	// TODO: Convert to bitfields
39	union {
40		struct {
41			unsigned sc : 1;
42			unsigned internalSc : 1;
43			unsigned si : 1;
44			unsigned idleSo : 1;
45			unsigned : 4;
46			unsigned start : 1;
47			unsigned : 3;
48			unsigned length : 1;
49			unsigned : 1;
50			unsigned irq : 1;
51			unsigned : 1;
52		} normalControl;
53
54		struct {
55			unsigned baud : 2;
56			unsigned slave : 1;
57			unsigned ready : 1;
58			unsigned id : 2;
59			unsigned error : 1;
60			unsigned busy : 1;
61			unsigned : 6;
62			unsigned irq : 1;
63			unsigned : 1;
64		} multiplayerControl;
65
66		uint16_t siocnt;
67	};
68};
69
70void GBASIOInit(struct GBASIO* sio);
71void GBASIODeinit(struct GBASIO* sio);
72void GBASIOReset(struct GBASIO* sio);
73
74void GBASIOSetDriverSet(struct GBASIO* sio, struct GBASIODriverSet* drivers);
75void GBASIOSetDriver(struct GBASIO* sio, struct GBASIODriver* driver, enum GBASIOMode mode);
76
77void GBASIOWriteRCNT(struct GBASIO* sio, uint16_t value);
78void GBASIOWriteSIOCNT(struct GBASIO* sio, uint16_t value);
79uint16_t GBASIOWriteRegister(struct GBASIO* sio, uint32_t address, uint16_t value);
80
81int32_t GBASIOProcessEvents(struct GBASIO* sio, int32_t cycles);
82
83#endif