giz rc1 release
[picodrive.git] / Pico / cd / Pico.c
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1// (c) Copyright 2007 notaz, All rights reserved.
2
3
4#include "../PicoInt.h"
5
6
7extern unsigned char formatted_bram[4*0x10];
8extern unsigned int s68k_poll_adclk;
9
10void (*PicoMCDopenTray)(void) = NULL;
11int (*PicoMCDcloseTray)(void) = NULL;
12
13#define dump_ram(ram,fname) \
14{ \
15 int i, d; \
16 FILE *f; \
17\
18 for (i = 0; i < sizeof(ram); i+=2) { \
19 d = (ram[i]<<8) | ram[i+1]; \
20 *(unsigned short *)(ram+i) = d; \
21 } \
22 f = fopen(fname, "wb"); \
23 if (f) { \
24 fwrite(ram, 1, sizeof(ram), f); \
25 fclose(f); \
26 } \
27 for (i = 0; i < sizeof(ram); i+=2) { \
28 d = (ram[i]<<8) | ram[i+1]; \
29 *(unsigned short *)(ram+i) = d; \
30 } \
31}
32
33
34PICO_INTERNAL int PicoInitMCD(void)
35{
36 SekInitS68k();
37 Init_CD_Driver();
38
39 return 0;
40}
41
42
43PICO_INTERNAL void PicoExitMCD(void)
44{
45 End_CD_Driver();
46
47 //dump_ram(Pico_mcd->prg_ram, "prg.bin");
48 //dump_ram(Pico.ram, "ram.bin");
49}
50
51PICO_INTERNAL int PicoResetMCD(int hard)
52{
53 if (hard) {
54 int fmt_size = sizeof(formatted_bram);
55 memset(Pico_mcd->prg_ram, 0, sizeof(Pico_mcd->prg_ram));
56 memset(Pico_mcd->word_ram2M, 0, sizeof(Pico_mcd->word_ram2M));
57 memset(Pico_mcd->pcm_ram, 0, sizeof(Pico_mcd->pcm_ram));
58 memset(Pico_mcd->bram, 0, sizeof(Pico_mcd->bram));
59 memcpy(Pico_mcd->bram + sizeof(Pico_mcd->bram) - fmt_size, formatted_bram, fmt_size);
60 }
61 memset(Pico_mcd->s68k_regs, 0, sizeof(Pico_mcd->s68k_regs));
62 memset(&Pico_mcd->pcm, 0, sizeof(Pico_mcd->pcm));
63 memset(&Pico_mcd->m, 0, sizeof(Pico_mcd->m));
64
65 *(unsigned int *)(Pico_mcd->bios + 0x70) = 0xffffffff; // reset hint vector (simplest way to implement reg6)
66 Pico_mcd->m.state_flags |= 1; // s68k reset pending
67 Pico_mcd->s68k_regs[3] = 1; // 2M word RAM mode with m68k access after reset
68
69 Reset_CD();
70 LC89510_Reset();
71 gfx_cd_reset();
72#ifdef _ASM_CD_MEMORY_C
73 PicoMemResetCD(1);
74 //PicoMemResetCDdecode(1); // don't have to call this in 2M mode
75#endif
76
77 // use SRam.data for RAM cart
78 if (SRam.data) free(SRam.data);
79 SRam.data = NULL;
80 if (PicoOpt&0x8000)
81 SRam.data = calloc(1, 0x12000);
82
83 return 0;
84}
85
86static __inline void SekRunM68k(int cyc)
87{
88 int cyc_do;
89 SekCycleAim+=cyc;
90 if((cyc_do=SekCycleAim-SekCycleCnt) < 0) return;
91#if defined(EMU_C68K)
92 PicoCpu.cycles=cyc_do;
93 CycloneRun(&PicoCpu);
94 SekCycleCnt+=cyc_do-PicoCpu.cycles;
95#elif defined(EMU_M68K)
96 m68k_set_context(&PicoM68kCPU);
97 SekCycleCnt+=m68k_execute(cyc_do);
98#endif
99}
100
101static __inline void SekRunS68k(int cyc)
102{
103 int cyc_do;
104 SekCycleAimS68k+=cyc;
105 if((cyc_do=SekCycleAimS68k-SekCycleCntS68k) < 0) return;
106#if defined(EMU_C68K)
107 PicoCpuS68k.cycles=cyc_do;
108 CycloneRun(&PicoCpuS68k);
109 SekCycleCntS68k+=cyc_do-PicoCpuS68k.cycles;
110#elif defined(EMU_M68K)
111 m68k_set_context(&PicoS68kCPU);
112 SekCycleCntS68k+=m68k_execute(cyc_do);
113#endif
114}
115
116#define PS_STEP_M68K ((488<<16)/20) // ~24
117//#define PS_STEP_S68K 13
118
119#ifdef _ASM_CD_PICO_C
120void SekRunPS(int cyc_m68k, int cyc_s68k);
121#else
122static __inline void SekRunPS(int cyc_m68k, int cyc_s68k)
123{
124 int cycn, cycn_s68k, cyc_do;
125 int ex;
126 SekCycleAim+=cyc_m68k;
127 SekCycleAimS68k+=cyc_s68k;
128
129// fprintf(stderr, "=== start %3i/%3i [%3i/%3i] {%05i.%i} ===\n", cyc_m68k, cyc_s68k,
130// SekCycleAim-SekCycleCnt, SekCycleAimS68k-SekCycleCntS68k, Pico.m.frame_count, Pico.m.scanline);
131
132 /* loop 488 downto 0 in steps of PS_STEP */
133 for (cycn = (488<<16)-PS_STEP_M68K; cycn >= 0; cycn -= PS_STEP_M68K)
134 {
135 ex = 0;
136 cycn_s68k = (cycn + cycn/2 + cycn/8) >> 16;
137 if ((cyc_do = SekCycleAim-SekCycleCnt-(cycn>>16)) > 0) {
138#if defined(EMU_C68K)
139 PicoCpu.cycles = cyc_do;
140 CycloneRun(&PicoCpu);
141 SekCycleCnt += cyc_do - PicoCpu.cycles;
142#elif defined(EMU_M68K)
143 m68k_set_context(&PicoM68kCPU);
144 SekCycleCnt += (ex = m68k_execute(cyc_do));
145#endif
146 }
147 if ((cyc_do = SekCycleAimS68k-SekCycleCntS68k-cycn_s68k) > 0) {
148#if defined(EMU_C68K)
149 PicoCpuS68k.cycles = cyc_do;
150 CycloneRun(&PicoCpuS68k);
151 SekCycleCntS68k += cyc_do - PicoCpuS68k.cycles;
152#elif defined(EMU_M68K)
153 m68k_set_context(&PicoS68kCPU);
154 SekCycleCntS68k += (ex = m68k_execute(cyc_do));
155#endif
156 }
157 }
158}
159#endif
160
161
162static __inline void check_cd_dma(void)
163{
164 int ddx;
165
166 if (!(Pico_mcd->scd.Status_CDC & 0x08)) return;
167
168 ddx = Pico_mcd->s68k_regs[4] & 7;
169 if (ddx < 2) return; // invalid
170 if (ddx < 4) {
171 Pico_mcd->s68k_regs[4] |= 0x40; // Data set ready in host port
172 return;
173 }
174 if (ddx == 6) return; // invalid
175
176 Update_CDC_TRansfer(ddx); // now go and do the actual transfer
177}
178
179static __inline void update_chips(void)
180{
181 int counter_timer, int3_set;
182 int counter75hz_lim = Pico.m.pal ? 2080 : 2096;
183
184 // 75Hz CDC update
185 if ((Pico_mcd->m.counter75hz+=10) >= counter75hz_lim) {
186 Pico_mcd->m.counter75hz -= counter75hz_lim;
187 Check_CD_Command();
188 }
189
190 // update timers
191 counter_timer = Pico.m.pal ? 0x21630 : 0x2121c; // 136752 : 135708;
192 Pico_mcd->m.timer_stopwatch += counter_timer;
193 if ((int3_set = Pico_mcd->s68k_regs[0x31])) {
194 Pico_mcd->m.timer_int3 -= counter_timer;
195 if (Pico_mcd->m.timer_int3 < 0) {
196 if (Pico_mcd->s68k_regs[0x33] & (1<<3)) {
197 elprintf(EL_INTS, "s68k: timer irq 3");
198 SekInterruptS68k(3);
199 Pico_mcd->m.timer_int3 += int3_set << 16;
200 }
201 // is this really what happens if irq3 is masked out?
202 Pico_mcd->m.timer_int3 &= 0xffffff;
203 }
204 }
205
206 // update gfx chip
207 if (Pico_mcd->rot_comp.Reg_58 & 0x8000)
208 gfx_cd_update();
209
210 // delayed setting of DMNA bit (needed for Silpheed)
211 if (Pico_mcd->m.state_flags & 2) {
212 Pico_mcd->m.state_flags &= ~2;
213 if (!(Pico_mcd->s68k_regs[3] & 4)) {
214 Pico_mcd->s68k_regs[3] |= 2;
215 Pico_mcd->s68k_regs[3] &= ~1;
216#ifdef USE_POLL_DETECT
217 if ((s68k_poll_adclk&0xfe) == 2) {
218 SekSetStopS68k(0); s68k_poll_adclk = 0;
219 }
220#endif
221 }
222 }
223}
224
225
226static __inline void getSamples(int y)
227{
228 int len = sound_render(0, PsndLen);
229 if (PicoWriteSound) PicoWriteSound(len);
230 // clear sound buffer
231 sound_clear();
232}
233
234
235#define PICO_CD
236#include "../PicoFrameHints.c"
237
238
239PICO_INTERNAL int PicoFrameMCD(void)
240{
241 if(!(PicoOpt&0x10))
242 PicoFrameStart();
243
244 PicoFrameHints();
245
246 return 0;
247}
248
249