/*
* PicoDrive
- * (C) notaz, 2009,2010
+ * (C) notaz, 2009,2010,2013
*
* This work is licensed under the terms of MAME license.
* See COPYING file in the top-level directory.
*/
#include "../pico_int.h"
-static int pwm_cycle_counter;
static int pwm_cycles;
static int pwm_mult;
static int pwm_ptr;
+static int pwm_irq_reload;
-static int pwm_smp_cnt;
-static int pwm_smp_expect;
-
-static int timer_cycles[2];
-static int timer_tick_cycles[2];
-
-// timers. This includes PWM timer in 32x and internal SH2 timers
-void p32x_timers_recalc(void)
+void p32x_pwm_ctl_changed(void)
{
+ int control = Pico32x.regs[0x30 / 2];
int cycles = Pico32x.regs[0x32 / 2];
- int tmp, i;
cycles = (cycles - 1) & 0x0fff;
- if (cycles < 500) {
- elprintf(EL_32X|EL_PWM|EL_ANOMALY, "pwm: low cycle value: %d", cycles + 1);
- cycles = 500;
- }
pwm_cycles = cycles;
pwm_mult = 0x10000 / cycles;
- // SH2 timer step
- for (i = 0; i < 2; i++) {
- tmp = PREG8(Pico32xMem->sh2_peri_regs[i], 0x80) & 7;
- // Sclk cycles per timer tick
- if (tmp)
- cycles = 0x20 << tmp;
- else
- cycles = 2;
- timer_tick_cycles[i] = cycles;
- elprintf(EL_32X, "WDT cycles[%d] = %d", i, cycles);
+ pwm_irq_reload = (control & 0x0f00) >> 8;
+ pwm_irq_reload = ((pwm_irq_reload - 1) & 0x0f) + 1;
+
+ if (Pico32x.pwm_irq_cnt == 0)
+ Pico32x.pwm_irq_cnt = pwm_irq_reload;
+}
+
+static void do_pwm_irq(SH2 *sh2, unsigned int m68k_cycles)
+{
+ Pico32x.sh2irqs |= P32XI_PWM;
+ p32x_update_irls(sh2, m68k_cycles);
+
+ if (Pico32x.regs[0x30 / 2] & P32XP_RTP) {
+ p32x_event_schedule(m68k_cycles, P32X_EVENT_PWM, pwm_cycles / 3 + 1);
+ // note: might recurse
+ p32x_dreq1_trigger();
}
}
-// PWM irq for every tm samples
-void p32x_timers_do(unsigned int cycles)
+#define consume_fifo(sh2, m68k_cycles) { \
+ int cycles_diff = ((m68k_cycles) * 3) - Pico32x.pwm_cycle_p; \
+ if (cycles_diff >= pwm_cycles) \
+ consume_fifo_do(sh2, m68k_cycles, cycles_diff); \
+}
+
+static void consume_fifo_do(SH2 *sh2, unsigned int m68k_cycles,
+ int sh2_cycles_diff)
{
- int cnt, i;
-
- cycles *= 3;
-
- // since we run things in async fashion, allow pwm to lag behind
- // but don't allow our "queue" to be infinite
- cnt = pwm_smp_expect - pwm_smp_cnt;
- if (cnt <= 0 || cnt * pwm_cycles < OSC_NTSC/7*3 / 60 / 2) {
- pwm_cycle_counter += cycles;
- while (pwm_cycle_counter > pwm_cycles) {
- pwm_cycle_counter -= pwm_cycles;
- pwm_smp_expect++;
- }
+ int do_irq = 0;
+
+ if (pwm_cycles == 0)
+ return;
+
+ elprintf(EL_PWM, "pwm: %u: consume %d/%d, %d,%d ptr %d",
+ m68k_cycles, sh2_cycles_diff, sh2_cycles_diff / pwm_cycles,
+ Pico32x.pwm_p[0], Pico32x.pwm_p[1], pwm_ptr);
+
+ if (sh2_cycles_diff >= pwm_cycles * 17) {
+ // silence/skip
+ Pico32x.pwm_cycle_p = m68k_cycles * 3;
+ Pico32x.pwm_p[0] = Pico32x.pwm_p[1] = 0;
+ return;
}
- // WDT timers
- for (i = 0; i < 2; i++) {
- void *pregs = Pico32xMem->sh2_peri_regs[i];
- if (PREG8(pregs, 0x80) & 0x20) { // TME
- timer_cycles[i] += cycles;
- cnt = PREG8(pregs, 0x81);
- while (timer_cycles[i] >= timer_tick_cycles[i]) {
- timer_cycles[i] -= timer_tick_cycles[i];
- cnt++;
- }
- if (cnt >= 0x100) {
- int level = PREG8(pregs, 0xe3) >> 4;
- int vector = PREG8(pregs, 0xe4) & 0x7f;
- elprintf(EL_32X, "%csh2 WDT irq (%d, %d)",
- i ? 's' : 'm', level, vector);
- sh2_internal_irq(&sh2s[i], level, vector);
- cnt &= 0xff;
- }
- PREG8(pregs, 0x81) = cnt;
+ while (sh2_cycles_diff >= pwm_cycles) {
+ struct Pico32xMem *mem = Pico32xMem;
+ short *fifo_l = mem->pwm_fifo[0];
+ short *fifo_r = mem->pwm_fifo[1];
+
+ if (Pico32x.pwm_p[0] > 0) {
+ fifo_l[0] = fifo_l[1];
+ fifo_l[1] = fifo_l[2];
+ fifo_l[2] = fifo_l[3];
+ Pico32x.pwm_p[0]--;
+ }
+ if (Pico32x.pwm_p[1] > 0) {
+ fifo_r[0] = fifo_r[1];
+ fifo_r[1] = fifo_r[2];
+ fifo_r[2] = fifo_r[3];
+ Pico32x.pwm_p[1]--;
+ }
+
+ mem->pwm[pwm_ptr * 2 ] = fifo_l[0];
+ mem->pwm[pwm_ptr * 2 + 1] = fifo_r[0];
+ pwm_ptr = (pwm_ptr + 1) & (PWM_BUFF_LEN - 1);
+
+ sh2_cycles_diff -= pwm_cycles;
+
+ if (--Pico32x.pwm_irq_cnt == 0) {
+ Pico32x.pwm_irq_cnt = pwm_irq_reload;
+ // irq also does dreq1, so call it after cycle update
+ do_irq = 1;
+ break;
}
}
+ Pico32x.pwm_cycle_p = m68k_cycles * 3 - sh2_cycles_diff;
+
+ if (do_irq)
+ do_pwm_irq(sh2, m68k_cycles);
}
-void p32x_pwm_schedule(unsigned int now)
+static int p32x_pwm_schedule_(SH2 *sh2, unsigned int m68k_now)
{
- int tm;
+ unsigned int sh2_now = m68k_now * 3;
+ int cycles_diff_sh2;
+
+ if (pwm_cycles == 0)
+ return 0;
+
+ cycles_diff_sh2 = sh2_now - Pico32x.pwm_cycle_p;
+ if (cycles_diff_sh2 >= pwm_cycles)
+ consume_fifo_do(sh2, m68k_now, cycles_diff_sh2);
- if (Pico32x.emu_flags & P32XF_PWM_PEND)
- return; // already scheduled
if (Pico32x.sh2irqs & P32XI_PWM)
- return; // previous not acked
+ return 0; // previous not acked
if (!((Pico32x.sh2irq_mask[0] | Pico32x.sh2irq_mask[1]) & 1))
- return; // masked by everyone
+ return 0; // masked by everyone
+
+ cycles_diff_sh2 = sh2_now - Pico32x.pwm_cycle_p;
+ return (Pico32x.pwm_irq_cnt * pwm_cycles
+ - cycles_diff_sh2) / 3 + 1;
+}
- tm = (Pico32x.regs[0x30 / 2] & 0x0f00) >> 8;
- tm = ((tm - 1) & 0x0f) + 1;
- p32x_event_schedule(P32X_EVENT_PWM, now, pwm_cycles * tm / 3);
- Pico32x.emu_flags |= P32XF_PWM_PEND;
+void p32x_pwm_schedule(unsigned int m68k_now)
+{
+ int after = p32x_pwm_schedule_(NULL, m68k_now);
+ if (after != 0)
+ p32x_event_schedule(m68k_now, P32X_EVENT_PWM, after);
}
-unsigned int p32x_pwm_read16(unsigned int a)
+void p32x_pwm_schedule_sh2(SH2 *sh2)
+{
+ int after = p32x_pwm_schedule_(sh2, sh2_cycles_done_m68k(sh2));
+ if (after != 0)
+ p32x_event_schedule_sh2(sh2, P32X_EVENT_PWM, after);
+}
+
+void p32x_pwm_irq_event(unsigned int m68k_now)
+{
+ p32x_pwm_schedule(m68k_now);
+}
+
+unsigned int p32x_pwm_read16(unsigned int a, SH2 *sh2,
+ unsigned int m68k_cycles)
{
unsigned int d = 0;
- int diff;
+
+ consume_fifo(sh2, m68k_cycles);
a &= 0x0e;
switch (a) {
case 0: // control
case 2: // cycle
- return Pico32x.regs[(0x30 + a) / 2];
+ d = Pico32x.regs[(0x30 + a) / 2];
+ break;
case 4: // L ch
+ if (Pico32x.pwm_p[0] == 3)
+ d |= P32XP_FULL;
+ else if (Pico32x.pwm_p[0] == 0)
+ d |= P32XP_EMPTY;
+ break;
+
case 6: // R ch
case 8: // MONO
- diff = pwm_smp_cnt - pwm_smp_expect;
- elprintf(EL_PWM, "pwm: read status: ptr %d/%d %d",
- pwm_smp_cnt, pwm_smp_expect, diff);
- if (diff > 3)
+ if (Pico32x.pwm_p[1] == 3)
d |= P32XP_FULL;
- else if (diff < 0)
+ else if (Pico32x.pwm_p[1] == 0)
d |= P32XP_EMPTY;
break;
}
+ elprintf(EL_PWM, "pwm: %u: r16 %02x %04x (p %d %d)",
+ m68k_cycles, a, d, Pico32x.pwm_p[0], Pico32x.pwm_p[1]);
return d;
}
-void p32x_pwm_write16(unsigned int a, unsigned int d)
+void p32x_pwm_write16(unsigned int a, unsigned int d,
+ SH2 *sh2, unsigned int m68k_cycles)
{
+ elprintf(EL_PWM, "pwm: %u: w16 %02x %04x (p %d %d)",
+ m68k_cycles, a & 0x0e, d, Pico32x.pwm_p[0], Pico32x.pwm_p[1]);
+
+ consume_fifo(sh2, m68k_cycles);
+
a &= 0x0e;
- if (a == 0) // control
+ if (a == 0) { // control
+ // supposedly we should stop FIFO when xMd is 0,
+ // but mars test disagrees
Pico32x.regs[0x30 / 2] = d;
+ p32x_pwm_ctl_changed();
+ Pico32x.pwm_irq_cnt = pwm_irq_reload; // ?
+ }
else if (a == 2) { // cycle
Pico32x.regs[0x32 / 2] = d & 0x0fff;
- p32x_timers_recalc();
- Pico32x.pwm_irq_sample_cnt = 0; // resets?
+ p32x_pwm_ctl_changed();
}
else if (a <= 8) {
- d &= 0x0fff;
+ d = (d - 1) & 0x0fff;
if (d > pwm_cycles)
d = pwm_cycles;
d = (d - pwm_cycles / 2) * pwm_mult;
- if (a < 6) // L ch
- Pico32xMem->pwm[pwm_ptr * 2] = d;
- else if (a == 6) // R ch
- Pico32xMem->pwm[pwm_ptr * 2 + 1] = d;
- else // MONO
- Pico32xMem->pwm[pwm_ptr * 2] = Pico32xMem->pwm[pwm_ptr * 2 + 1] = d;
-
- if (a >= 6) { // R or MONO
- pwm_smp_cnt++;
- pwm_ptr = (pwm_ptr + 1) & (PWM_BUFF_LEN - 1);
- elprintf(EL_PWM, "pwm: smp_cnt %d, ptr %d, smp %x",
- pwm_smp_cnt, pwm_ptr, d);
+ if (a == 4 || a == 8) { // L ch or MONO
+ short *fifo = Pico32xMem->pwm_fifo[0];
+ if (Pico32x.pwm_p[0] < 3)
+ Pico32x.pwm_p[0]++;
+ else {
+ fifo[1] = fifo[2];
+ fifo[2] = fifo[3];
+ }
+ fifo[Pico32x.pwm_p[0]] = d;
+ }
+ if (a == 6 || a == 8) { // R ch or MONO
+ short *fifo = Pico32xMem->pwm_fifo[1];
+ if (Pico32x.pwm_p[1] < 3)
+ Pico32x.pwm_p[1]++;
+ else {
+ fifo[1] = fifo[2];
+ fifo[2] = fifo[3];
+ }
+ fifo[Pico32x.pwm_p[1]] = d;
}
}
}
short *pwmb;
int step;
int p = 0;
+ int xmd;
- if (pwm_ptr <= 16) // at least some samples..
- return;
+ xmd = Pico32x.regs[0x30 / 2] & 0x0f;
+ if ((xmd != 0x05 && xmd != 0x0a) || pwm_ptr <= 16)
+ goto out;
step = (pwm_ptr << 16) / length; // FIXME: division..
pwmb = Pico32xMem->pwm;
if (stereo)
{
- while (length-- > 0) {
- *buf32++ += pwmb[0];
- *buf32++ += pwmb[1];
+ if (xmd == 0x0a) {
+ // channel swap
+ while (length-- > 0) {
+ *buf32++ += pwmb[1];
+ *buf32++ += pwmb[0];
- p += step;
- pwmb += (p >> 16) * 2;
- p &= 0xffff;
+ p += step;
+ pwmb += (p >> 16) * 2;
+ p &= 0xffff;
+ }
+ }
+ else {
+ while (length-- > 0) {
+ *buf32++ += pwmb[0];
+ *buf32++ += pwmb[1];
+
+ p += step;
+ pwmb += (p >> 16) * 2;
+ p &= 0xffff;
+ }
}
}
else
elprintf(EL_PWM, "pwm_update: pwm_ptr %d, len %d, step %04x, done %d",
pwm_ptr, length, step, (pwmb - Pico32xMem->pwm) / 2);
+out:
pwm_ptr = 0;
}
+void p32x_pwm_state_loaded(void)
+{
+ int cycles_diff_sh2;
+
+ p32x_pwm_ctl_changed();
+
+ // for old savestates
+ cycles_diff_sh2 = SekCycleCntT * 3 - Pico32x.pwm_cycle_p;
+ if (cycles_diff_sh2 >= pwm_cycles || cycles_diff_sh2 < 0) {
+ Pico32x.pwm_irq_cnt = pwm_irq_reload;
+ Pico32x.pwm_cycle_p = SekCycleCntT * 3;
+ p32x_pwm_schedule(SekCycleCntT);
+ }
+}
+
// vim:shiftwidth=2:ts=2:expandtab