32x: watchdog for Star Wars, SCI IRQs for X-men (also needs idle loop hacks)

[picodrive.git] / pico / 32x / pwm.c

diff --git a/pico/32x/pwm.c b/pico/32x/pwm.c
index 9475c00..0e73078 100644 (file)
--- a/pico/32x/pwm.c
+++ b/pico/32x/pwm.c
@@ -6,11 +6,14 @@ static int pwm_mult;
 static int pwm_ptr;
 int pwm_frame_smp_cnt;
 
+static int timer_line_ticks[2];
 
-void p32x_pwm_refresh(void)
+// timers. This includes PWM timer in 32x and internal SH2 timers
+void p32x_timers_recalc(void)
 {
   int cycles = Pico32x.regs[0x32 / 2];
   int frame_samples;
+  int tmp, i;
 
   cycles = (cycles - 1) & 0x0fff;
   if (cycles < 500) {
@@ -25,22 +28,56 @@ void p32x_pwm_refresh(void)
     frame_samples = OSC_NTSC / 7 * 3 / 60 / cycles;
 
   pwm_line_samples = (frame_samples << 16) / scanlines_total;
+
+  // 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;
+    if (Pico.m.pal)
+      tmp = OSC_PAL / 7 * 3 / 50 / scanlines_total;
+    else
+      tmp = OSC_NTSC / 7 * 3 / 60 / scanlines_total;
+    timer_line_ticks[i] = (tmp << 16) / cycles;
+    elprintf(EL_32X, "timer_line_ticks[%d] = %.3f", i, (double)timer_line_ticks[i] / 0x10000);
+  }
 }
 
-// irq for every sample??
-// FIXME: we need to hit more than once per line :(
-void p32x_pwm_irq_check(int new_line)
+// PWM irq for every tm samples
+void p32x_timers_do(int new_line)
 {
-  int tm = (Pico32x.regs[0x30 / 2] & 0x0f00) >> 8;
-  if (tm == 0)
-    return; // TODO: verify
-
-  if (new_line)
-    Pico32x.pwm_irq_sample_cnt += pwm_line_samples;
-  if (Pico32x.pwm_irq_sample_cnt >= (tm << 16)) {
-    Pico32x.pwm_irq_sample_cnt -= tm << 16;
-    Pico32x.sh2irqs |= P32XI_PWM;
-    p32x_update_irls();
+  int tm, cnt, i;
+  tm = (Pico32x.regs[0x30 / 2] & 0x0f00) >> 8;
+  if (tm != 0) {
+    if (new_line)
+      Pico32x.pwm_irq_sample_cnt += pwm_line_samples;
+    if (Pico32x.pwm_irq_sample_cnt >= (tm << 16)) {
+      Pico32x.pwm_irq_sample_cnt -= tm << 16;
+      Pico32x.sh2irqs |= P32XI_PWM;
+      p32x_update_irls();
+    }
+  }
+
+  if (!new_line)
+    return;
+
+  for (i = 0; i < 2; i++) {
+    void *pregs = Pico32xMem->sh2_peri_regs[i];
+    if (PREG8(pregs, 0x80) & 0x20) { // TME
+      cnt = PREG8(pregs, 0x81);
+      cnt += timer_line_ticks[i];
+      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;
+    }
   }
 }
 
@@ -78,7 +115,7 @@ void p32x_pwm_write16(unsigned int a, unsigned int d)
     Pico32x.regs[0x30 / 2] = d;
   else if (a == 2) { // cycle
     Pico32x.regs[0x32 / 2] = d & 0x0fff;
-    p32x_pwm_refresh();
+    p32x_timers_recalc();
     Pico32x.pwm_irq_sample_cnt = 0; // resets?
   }
   else if (a <= 8) {