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;
14 static int timer_cycles[2];
15 static int timer_tick_cycles[2];
17 // timers. This includes PWM timer in 32x and internal SH2 timers
18 void p32x_timers_recalc(void)
20 int cycles = Pico32x.regs[0x32 / 2];
23 cycles = (cycles - 1) & 0x0fff;
25 pwm_mult = 0x10000 / cycles;
28 for (i = 0; i < 2; i++) {
29 tmp = PREG8(Pico32xMem->sh2_peri_regs[i], 0x80) & 7;
30 // Sclk cycles per timer tick
35 timer_tick_cycles[i] = cycles;
36 elprintf(EL_32X, "WDT cycles[%d] = %d", i, cycles);
40 #define consume_fifo(cycles) { \
41 int cycles_diff = (cycles) - Pico32x.pwm_cycle_p; \
42 if (cycles_diff >= pwm_cycles) \
43 consume_fifo_do((cycles), cycles_diff); \
46 static void consume_fifo_do(unsigned int cycles, int cycles_diff)
51 elprintf(EL_PWM, "pwm: %u: consume %d/%d, %d,%d ptr %d",
52 cycles, cycles_diff, cycles_diff / pwm_cycles,
53 Pico32x.pwm_p[0], Pico32x.pwm_p[1], pwm_ptr);
55 if (cycles_diff > pwm_cycles * 9) {
57 Pico32x.pwm_cycle_p = cycles;
58 Pico32x.pwm_p[0] = Pico32x.pwm_p[1] = 0;
62 for (; cycles_diff >= pwm_cycles; cycles_diff -= pwm_cycles) {
63 struct Pico32xMem *mem = Pico32xMem;
64 short *fifo_l = mem->pwm_fifo[0];
65 short *fifo_r = mem->pwm_fifo[1];
67 if (Pico32x.pwm_p[0] > 0) {
68 fifo_l[0] = fifo_l[1];
69 fifo_l[1] = fifo_l[2];
70 fifo_l[2] = fifo_l[3];
73 if (Pico32x.pwm_p[1] > 0) {
74 fifo_r[0] = fifo_r[1];
75 fifo_r[1] = fifo_r[2];
76 fifo_r[2] = fifo_r[3];
80 mem->pwm[pwm_ptr * 2 ] = fifo_l[0];
81 mem->pwm[pwm_ptr * 2 + 1] = fifo_r[0];
82 pwm_ptr = (pwm_ptr + 1) & (PWM_BUFF_LEN - 1);
84 Pico32x.pwm_cycle_p = cycles - cycles_diff;
87 void p32x_timers_do(unsigned int m68k_now, unsigned int m68k_slice)
89 unsigned int cycles = m68k_slice * 3;
92 consume_fifo(m68k_now * 3);
95 for (i = 0; i < 2; i++) {
96 void *pregs = Pico32xMem->sh2_peri_regs[i];
97 if (PREG8(pregs, 0x80) & 0x20) { // TME
98 timer_cycles[i] += cycles;
99 cnt = PREG8(pregs, 0x81);
100 while (timer_cycles[i] >= timer_tick_cycles[i]) {
101 timer_cycles[i] -= timer_tick_cycles[i];
105 int level = PREG8(pregs, 0xe3) >> 4;
106 int vector = PREG8(pregs, 0xe4) & 0x7f;
107 elprintf(EL_32X, "%csh2 WDT irq (%d, %d)",
108 i ? 's' : 'm', level, vector);
109 sh2_internal_irq(&sh2s[i], level, vector);
112 PREG8(pregs, 0x81) = cnt;
117 static int p32x_pwm_schedule_(void)
121 if (Pico32x.emu_flags & P32XF_PWM_PEND)
122 return 0; // already scheduled
123 if (Pico32x.sh2irqs & P32XI_PWM)
124 return 0; // previous not acked
125 if (!((Pico32x.sh2irq_mask[0] | Pico32x.sh2irq_mask[1]) & 1))
126 return 0; // masked by everyone
128 Pico32x.emu_flags |= P32XF_PWM_PEND;
129 tm = (Pico32x.regs[0x30 / 2] & 0x0f00) >> 8;
130 tm = ((tm - 1) & 0x0f) + 1;
131 return pwm_cycles * tm / 3;
134 void p32x_pwm_schedule(unsigned int now)
136 int after = p32x_pwm_schedule_();
138 p32x_event_schedule(now, P32X_EVENT_PWM, after);
141 void p32x_pwm_schedule_sh2(SH2 *sh2)
143 int after = p32x_pwm_schedule_();
145 p32x_event_schedule_sh2(sh2, P32X_EVENT_PWM, after);
148 unsigned int p32x_pwm_read16(unsigned int a, unsigned int cycles)
152 consume_fifo(cycles);
158 d = Pico32x.regs[(0x30 + a) / 2];
162 if (Pico32x.pwm_p[0] == 3)
164 else if (Pico32x.pwm_p[0] == 0)
170 if (Pico32x.pwm_p[1] == 3)
172 else if (Pico32x.pwm_p[1] == 0)
177 elprintf(EL_PWM, "pwm: read %02x %04x (p %d %d), c %u",
178 a, d, Pico32x.pwm_p[0], Pico32x.pwm_p[1], cycles);
182 void p32x_pwm_write16(unsigned int a, unsigned int d, unsigned int cycles)
184 consume_fifo(cycles);
187 if (a == 0) { // control
188 // supposedly we should stop FIFO when xMd is 0,
189 // but mars test disagrees
190 Pico32x.regs[0x30 / 2] = d;
192 else if (a == 2) { // cycle
193 Pico32x.regs[0x32 / 2] = d & 0x0fff;
194 p32x_timers_recalc();
195 Pico32x.pwm_irq_sample_cnt = 0; // resets?
198 d = (d - 1) & 0x0fff;
201 d = (d - pwm_cycles / 2) * pwm_mult;
203 if (a == 4 || a == 8) { // L ch or MONO
204 short *fifo = Pico32xMem->pwm_fifo[0];
205 if (Pico32x.pwm_p[0] < 3)
211 fifo[Pico32x.pwm_p[0]] = d;
213 if (a == 6 || a == 8) { // R ch or MONO
214 short *fifo = Pico32xMem->pwm_fifo[1];
215 if (Pico32x.pwm_p[1] < 3)
221 fifo[Pico32x.pwm_p[1]] = d;
226 void p32x_pwm_update(int *buf32, int length, int stereo)
233 xmd = Pico32x.regs[0x30 / 2] & 0x0f;
234 if ((xmd != 0x05 && xmd != 0x0a) || pwm_ptr <= 16)
237 step = (pwm_ptr << 16) / length; // FIXME: division..
238 pwmb = Pico32xMem->pwm;
244 while (length-- > 0) {
249 pwmb += (p >> 16) * 2;
254 while (length-- > 0) {
259 pwmb += (p >> 16) * 2;
266 while (length-- > 0) {
270 pwmb += (p >> 16) * 2;
275 elprintf(EL_PWM, "pwm_update: pwm_ptr %d, len %d, step %04x, done %d",
276 pwm_ptr, length, step, (pwmb - Pico32xMem->pwm) / 2);
282 // vim:shiftwidth=2:ts=2:expandtab