3 * (C) notaz, 2009,2010,2013
5 * This work is licensed under the terms of MAME license.
6 * See COPYING file in the top-level directory.
8 #include "../pico_int.h"
10 static int pwm_cycles;
13 static int pwm_irq_reload;
15 static int timer_cycles[2];
16 static int timer_tick_cycles[2];
18 // timers. This includes PWM timer in 32x and internal SH2 timers
19 void p32x_timers_recalc(void)
21 int control = Pico32x.regs[0x30 / 2];
22 int cycles = Pico32x.regs[0x32 / 2];
25 cycles = (cycles - 1) & 0x0fff;
27 pwm_mult = 0x10000 / cycles;
29 pwm_irq_reload = (control & 0x0f00) >> 8;
30 pwm_irq_reload = ((pwm_irq_reload - 1) & 0x0f) + 1;
32 if (Pico32x.pwm_irq_cnt == 0)
33 Pico32x.pwm_irq_cnt = pwm_irq_reload;
36 for (i = 0; i < 2; i++) {
37 tmp = PREG8(Pico32xMem->sh2_peri_regs[i], 0x80) & 7;
38 // Sclk cycles per timer tick
43 timer_tick_cycles[i] = cycles;
44 elprintf(EL_32X, "WDT cycles[%d] = %d", i, cycles);
48 static void do_pwm_irq(unsigned int m68k_cycles)
50 Pico32x.sh2irqs |= P32XI_PWM;
51 p32x_update_irls(NULL);
53 if (Pico32x.regs[0x30 / 2] & P32XP_RTP) {
54 p32x_event_schedule(m68k_cycles, P32X_EVENT_PWM, pwm_cycles / 3 + 1);
55 // note: might recurse
60 #define consume_fifo(m68k_cycles) { \
61 int cycles_diff = ((m68k_cycles) * 3) - Pico32x.pwm_cycle_p; \
62 if (cycles_diff >= pwm_cycles) \
63 consume_fifo_do(m68k_cycles, cycles_diff); \
66 static void consume_fifo_do(unsigned int m68k_cycles, int sh2_cycles_diff)
73 elprintf(EL_PWM, "pwm: %u: consume %d/%d, %d,%d ptr %d",
74 m68k_cycles, sh2_cycles_diff, sh2_cycles_diff / pwm_cycles,
75 Pico32x.pwm_p[0], Pico32x.pwm_p[1], pwm_ptr);
77 if (sh2_cycles_diff >= pwm_cycles * 17) {
79 Pico32x.pwm_cycle_p = m68k_cycles * 3;
80 Pico32x.pwm_p[0] = Pico32x.pwm_p[1] = 0;
84 while (sh2_cycles_diff >= pwm_cycles) {
85 struct Pico32xMem *mem = Pico32xMem;
86 short *fifo_l = mem->pwm_fifo[0];
87 short *fifo_r = mem->pwm_fifo[1];
89 if (Pico32x.pwm_p[0] > 0) {
90 fifo_l[0] = fifo_l[1];
91 fifo_l[1] = fifo_l[2];
92 fifo_l[2] = fifo_l[3];
95 if (Pico32x.pwm_p[1] > 0) {
96 fifo_r[0] = fifo_r[1];
97 fifo_r[1] = fifo_r[2];
98 fifo_r[2] = fifo_r[3];
102 mem->pwm[pwm_ptr * 2 ] = fifo_l[0];
103 mem->pwm[pwm_ptr * 2 + 1] = fifo_r[0];
104 pwm_ptr = (pwm_ptr + 1) & (PWM_BUFF_LEN - 1);
106 sh2_cycles_diff -= pwm_cycles;
108 if (--Pico32x.pwm_irq_cnt == 0) {
109 Pico32x.pwm_irq_cnt = pwm_irq_reload;
110 // irq also does dreq1, so call it after cycle update
115 Pico32x.pwm_cycle_p = m68k_cycles * 3 - sh2_cycles_diff;
118 do_pwm_irq(m68k_cycles);
121 void p32x_timers_do(unsigned int m68k_now, unsigned int m68k_slice)
123 unsigned int cycles = m68k_slice * 3;
126 //consume_fifo(m68k_now);
129 for (i = 0; i < 2; i++) {
130 void *pregs = Pico32xMem->sh2_peri_regs[i];
131 if (PREG8(pregs, 0x80) & 0x20) { // TME
132 timer_cycles[i] += cycles;
133 cnt = PREG8(pregs, 0x81);
134 while (timer_cycles[i] >= timer_tick_cycles[i]) {
135 timer_cycles[i] -= timer_tick_cycles[i];
139 int level = PREG8(pregs, 0xe3) >> 4;
140 int vector = PREG8(pregs, 0xe4) & 0x7f;
141 elprintf(EL_32X, "%csh2 WDT irq (%d, %d)",
142 i ? 's' : 'm', level, vector);
143 sh2_internal_irq(&sh2s[i], level, vector);
146 PREG8(pregs, 0x81) = cnt;
151 static int p32x_pwm_schedule_(unsigned int m68k_now)
153 unsigned int sh2_now = m68k_now * 3;
159 cycles_diff_sh2 = sh2_now - Pico32x.pwm_cycle_p;
160 if (cycles_diff_sh2 >= pwm_cycles)
161 consume_fifo_do(m68k_now, cycles_diff_sh2);
163 if (Pico32x.sh2irqs & P32XI_PWM)
164 return 0; // previous not acked
165 if (!((Pico32x.sh2irq_mask[0] | Pico32x.sh2irq_mask[1]) & 1))
166 return 0; // masked by everyone
168 cycles_diff_sh2 = sh2_now - Pico32x.pwm_cycle_p;
169 return (Pico32x.pwm_irq_cnt * pwm_cycles
170 - cycles_diff_sh2) / 3 + 1;
173 void p32x_pwm_schedule(unsigned int m68k_now)
175 int after = p32x_pwm_schedule_(m68k_now);
177 p32x_event_schedule(m68k_now, P32X_EVENT_PWM, after);
180 void p32x_pwm_schedule_sh2(SH2 *sh2)
182 int after = p32x_pwm_schedule_(sh2_cycles_done_m68k(sh2));
184 p32x_event_schedule_sh2(sh2, P32X_EVENT_PWM, after);
187 void p32x_pwm_irq_event(unsigned int m68k_now)
189 p32x_pwm_schedule(m68k_now);
192 unsigned int p32x_pwm_read16(unsigned int a, unsigned int m68k_cycles)
196 consume_fifo(m68k_cycles);
202 d = Pico32x.regs[(0x30 + a) / 2];
206 if (Pico32x.pwm_p[0] == 3)
208 else if (Pico32x.pwm_p[0] == 0)
214 if (Pico32x.pwm_p[1] == 3)
216 else if (Pico32x.pwm_p[1] == 0)
221 elprintf(EL_PWM, "pwm: %u: r16 %02x %04x (p %d %d)",
222 m68k_cycles, a, d, Pico32x.pwm_p[0], Pico32x.pwm_p[1]);
226 void p32x_pwm_write16(unsigned int a, unsigned int d,
227 unsigned int m68k_cycles)
229 elprintf(EL_PWM, "pwm: %u: w16 %02x %04x (p %d %d)",
230 m68k_cycles, a & 0x0e, d, Pico32x.pwm_p[0], Pico32x.pwm_p[1]);
232 consume_fifo(m68k_cycles);
235 if (a == 0) { // control
236 // supposedly we should stop FIFO when xMd is 0,
237 // but mars test disagrees
238 Pico32x.regs[0x30 / 2] = d;
239 p32x_timers_recalc();
240 Pico32x.pwm_irq_cnt = pwm_irq_reload; // ?
242 else if (a == 2) { // cycle
243 Pico32x.regs[0x32 / 2] = d & 0x0fff;
244 p32x_timers_recalc();
247 d = (d - 1) & 0x0fff;
250 d = (d - pwm_cycles / 2) * pwm_mult;
252 if (a == 4 || a == 8) { // L ch or MONO
253 short *fifo = Pico32xMem->pwm_fifo[0];
254 if (Pico32x.pwm_p[0] < 3)
260 fifo[Pico32x.pwm_p[0]] = d;
262 if (a == 6 || a == 8) { // R ch or MONO
263 short *fifo = Pico32xMem->pwm_fifo[1];
264 if (Pico32x.pwm_p[1] < 3)
270 fifo[Pico32x.pwm_p[1]] = d;
275 void p32x_pwm_update(int *buf32, int length, int stereo)
282 xmd = Pico32x.regs[0x30 / 2] & 0x0f;
283 if ((xmd != 0x05 && xmd != 0x0a) || pwm_ptr <= 16)
286 step = (pwm_ptr << 16) / length; // FIXME: division..
287 pwmb = Pico32xMem->pwm;
293 while (length-- > 0) {
298 pwmb += (p >> 16) * 2;
303 while (length-- > 0) {
308 pwmb += (p >> 16) * 2;
315 while (length-- > 0) {
319 pwmb += (p >> 16) * 2;
324 elprintf(EL_PWM, "pwm_update: pwm_ptr %d, len %d, step %04x, done %d",
325 pwm_ptr, length, step, (pwmb - Pico32xMem->pwm) / 2);
331 void p32x_pwm_state_loaded(void)
335 p32x_timers_recalc();
337 // for old savestates
338 cycles_diff_sh2 = SekCycleCntT * 3 - Pico32x.pwm_cycle_p;
339 if (cycles_diff_sh2 >= pwm_cycles || cycles_diff_sh2 < 0) {
340 Pico32x.pwm_irq_cnt = pwm_irq_reload;
341 Pico32x.pwm_cycle_p = SekCycleCntT * 3;
342 p32x_pwm_schedule(SekCycleCntT);
346 // vim:shiftwidth=2:ts=2:expandtab