clarify PicoDrive's license

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

diff --git a/pico/32x/pwm.c b/pico/32x/pwm.c
index 102794b..018a200 100644 (file)
--- a/pico/32x/pwm.c
+++ b/pico/32x/pwm.c
@@ -1,3 +1,10 @@
+/*
+ * PicoDrive
+ * (C) notaz, 2009,2010
+ *
+ * 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_line_samples;
@@ -6,15 +13,18 @@ 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) {
-    elprintf(EL_32X|EL_ANOMALY, "pwm: low cycle value: %d", cycles + 1);
+    elprintf(EL_32X|EL_PWM|EL_ANOMALY, "pwm: low cycle value: %d", cycles + 1);
     cycles = 500;
   }
   pwm_cycles = cycles;
@@ -25,21 +35,60 @@ 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(void)
+// PWM irq for every tm samples
+void p32x_timers_do(int line_call)
 {
-  int tm = (Pico32x.regs[0x30 / 2] & 0x0f00) >> 8;
-  if (tm == 0)
-    return; // TODO: verify
-
-  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;
+
+  if (PicoOpt & POPT_EN_PWM)
+  {
+    tm = (Pico32x.regs[0x30 / 2] & 0x0f00) >> 8;
+    if (tm != 0) {
+      if (line_call)
+        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(!line_call);
+      }
+    }
+  }
+
+  if (!line_call)
+    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;
+    }
   }
 }
 
@@ -58,7 +107,7 @@ unsigned int p32x_pwm_read16(unsigned int a)
     case 6: // R ch
     case 8: // MONO
       predict = (pwm_line_samples * Pico.m.scanline) >> 16;
-      elprintf(EL_32X, "pwm: read status: ptr %d/%d, predict %d",
+      elprintf(EL_PWM, "pwm: read status: ptr %d/%d, predict %d",
         pwm_frame_smp_cnt, (pwm_line_samples * scanlines_total) >> 16, predict);
       if (pwm_frame_smp_cnt > predict + 3)
         d |= P32XP_FULL;
@@ -77,7 +126,7 @@ 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) {
@@ -96,14 +145,13 @@ void p32x_pwm_write16(unsigned int a, unsigned int d)
     if (a >= 6) { // R or MONO
       pwm_frame_smp_cnt++;
       pwm_ptr = (pwm_ptr + 1) & (PWM_BUFF_LEN - 1);
-        elprintf(EL_32X, "pwm: smp_cnt %d, ptr %d, smp %x", pwm_frame_smp_cnt, pwm_ptr, d);
+        elprintf(EL_PWM, "pwm: smp_cnt %d, ptr %d, smp %x", pwm_frame_smp_cnt, pwm_ptr, d);
     }
   }
 }
 
 void p32x_pwm_update(int *buf32, int length, int stereo)
 {
-  extern int pwm_ptr;
   short *pwmb;
   int step;
   int p = 0;
@@ -136,7 +184,7 @@ void p32x_pwm_update(int *buf32, int length, int stereo)
     }
   }
 
-  elprintf(EL_STATUS, "pwm_update: pwm_ptr %d, len %d, step %04x, done %d",
+  elprintf(EL_PWM, "pwm_update: pwm_ptr %d, len %d, step %04x, done %d",
     pwm_ptr, length, step, (pwmb - Pico32xMem->pwm) / 2);
 
   pwm_ptr = 0;