Changeset e57b0e2 in rtems for c/src/lib/libcpu/powerpc/ppc403/clock/clock.c

Timestamp:

12/05/95 19:23:05 (27 years ago)

Author:

Joel Sherrill <joel.sherrill@…>

Branches:

4.10, 4.11, 4.8, 4.9, 5, master

Children:

e88d2db

Parents:

289ad86

Message:

update from Andy Bray <andy@…>

File:

• c/src/lib/libcpu/powerpc/ppc403/clock/clock.c (modified) (7 diffs)

c/src/lib/libcpu/powerpc/ppc403/clock/clock.c

@@ -4 +4 @@
  *  PowerPC 403 CPU.  The tick frequency is specified by the bsp.
  *
- *  Author:     Andrew Bray <andy@i-cubed.demon.co.uk>
+ *  Author: Andrew Bray <andy@i-cubed.co.uk>
  *
  *  COPYRIGHT (c) 1995 by i-cubed ltd.
@@ -57 +57 @@
     register rtems_unsigned32 rc;
 
-    asm volatile ("mftblo %0" : "=r" ((rc)));
+    asm volatile ("mfspr %0, 0x3dd" : "=r" ((rc))); /* TBLO */
 
     return rc;
@@ -70 +70 @@
 {
     if (!auto_restart)
-        {
-            rtems_unsigned32 clicks_til_next_interrupt;
-            rtems_unsigned32 itimer_value;
-
-            /*
-             * setup for next interrupt; making sure the new value is reasonably
-             * in the future.... in case we lost out on an interrupt somehow
-             */
-
-            itimer_value = get_itimer();
-            tick_time += pit_value;
-
-            /*
-             * how far away is next interrupt *really*
-             * It may be a long time; this subtraction works even if
-             * Clock_clicks_interrupt < Clock_clicks_low_order via
-             * the miracle of unsigned math.
-             */
-            clicks_til_next_interrupt = tick_time - itimer_value;
-
-            /*
-             * If it is too soon then bump it up.
-             * This should only happen if CPU_HPPA_CLICKS_PER_TICK is too small.
-             * But setting it low is useful for debug, so...
-             */
-
-            if (clicks_til_next_interrupt < 400)
-                {
-                    tick_time = itimer_value + 1000;
-                    clicks_til_next_interrupt = 1000;
-                    /* XXX: count these! this should be rare */
-                }
-
-            /*
-             * If it is too late, that means we missed the interrupt somehow.
-             * Rather than wait 35-50s for a wrap, we just fudge it here.
-             */
-            
-            if (clicks_til_next_interrupt > pit_value)
-                {
-                    tick_time = itimer_value + 1000;
-                    clicks_til_next_interrupt = 1000;
-                    /* XXX: count these! this should never happen :-) */
-                }
-
-            asm volatile ("mtpit %0" :: "r" (clicks_til_next_interrupt));
-        }
-
-    asm volatile ( "mttsr %0" :: "r" (0x08000000));
-
+    {
+      rtems_unsigned32 clicks_til_next_interrupt;
+      rtems_unsigned32 itimer_value;
+ 
+      /*
+       * setup for next interrupt; making sure the new value is reasonably
+       * in the future.... in case we lost out on an interrupt somehow
+       */
+ 
+      itimer_value = get_itimer();
+      tick_time += pit_value;
+ 
+      /*
+       * how far away is next interrupt *really*
+       * It may be a long time; this subtraction works even if
+       * Clock_clicks_interrupt < Clock_clicks_low_order via
+       * the miracle of unsigned math.
+       */
+      clicks_til_next_interrupt = tick_time - itimer_value;
+ 
+      /*
+       * If it is too soon then bump it up.
+       * This should only happen if CPU_HPPA_CLICKS_PER_TICK is too small.
+       * But setting it low is useful for debug, so...
+       */
+ 
+      if (clicks_til_next_interrupt < 400)
+      {
+        tick_time = itimer_value + 1000;
+        clicks_til_next_interrupt = 1000;
+        /* XXX: count these! this should be rare */
+      }
+ 
+      /*
+       * If it is too late, that means we missed the interrupt somehow.
+       * Rather than wait 35-50s for a wrap, we just fudge it here.
+       */
+ 
+      if (clicks_til_next_interrupt > pit_value)
+      {
+        tick_time = itimer_value + 1000;
+        clicks_til_next_interrupt = 1000;
+        /* XXX: count these! this should never happen :-) */
+      }
+ 
+      asm volatile ("mtspr 0x3db, %0" :: "r" 
+                         (clicks_til_next_interrupt)); /* PIT */
+  }
+ 
+    asm volatile ( "mtspr 0x3d8, %0" :: "r" (0x08000000)); /* TSR */
+ 
     Clock_driver_ticks++;
-
+ 
     rtems_clock_tick();
 }
@@ -129 +130 @@
     rtems_isr_entry previous_isr;
     rtems_unsigned32 pvr, iocr;
-
+ 
     Clock_driver_ticks = 0;
-
-    asm volatile ("mfiocr %0" : "=r" (iocr));
+ 
+    asm volatile ("mfdcr %0, 0xa0" : "=r" (iocr)); /* IOCR */
     iocr &= ~4;
     iocr |= 4;  /* Select external timer clock */
-    asm volatile ("mtiocr %0" : "=r" (iocr) : "0" (iocr));
-
-    asm volatile ("mfpvr %0" : "=r" ((pvr)));
-
+    asm volatile ("mtdcr 0xa0, %0" : "=r" (iocr) : "0" (iocr)); /* IOCR */
+ 
+    asm volatile ("mfspr %0, 0x11f" : "=r" ((pvr))); /* PVR */
+ 
     if (((pvr & 0xffff0000) >> 16) != 0x0020)
-        return; /* Not a ppc403 */
-
+      return; /* Not a ppc403 */
+ 
     if ((pvr & 0xff00) == 0x0000) /* 403GA */
-        auto_restart = (pvr & 0x00f0) > 0x0000 ? 1 : 0;
+      auto_restart = (pvr & 0x00f0) > 0x0000 ? 1 : 0;
     else if ((pvr & 0xff00) == 0x0100) /* 403GB */
-        auto_restart = 1;
-
+      auto_restart = 1;
+ 
     pit_value = BSP_Configuration.microseconds_per_tick *
-        Cpu_table.clicks_per_usec;
-
+      Cpu_table.clicks_per_usec;
+ 
     if (BSP_Configuration.ticks_per_timeslice)
     {
-        register rtems_unsigned32 tcr;
+      register rtems_unsigned32 tcr;
+
         /*
          * initialize the interval here
@@ -160 +162 @@
          * interrupt overhead
          */
-
-        rtems_interrupt_catch(clock_isr, PPC_IRQ_PIT,
-                              &previous_isr);
-
-        asm volatile ("mtpit %0" : : "r" (pit_value));
-
-        asm volatile ("mftcr %0" : "=r" ((tcr)));
-
-        tcr &= ~ 0x04400000;
-
-        tcr |= (auto_restart ? 0x04400000 : 0x04000000);
-
-        tick_time = get_itimer() + pit_value;
-
-        asm volatile ("mttcr %0" : "=r" ((tcr)) : "0" ((tcr)));
+ 
+      rtems_interrupt_catch(clock_isr, PPC_IRQ_PIT, &previous_isr);
+ 
+      asm volatile ("mtspr 0x3db, %0" : : "r" (pit_value)); /* PIT */
+ 
+      asm volatile ("mfspr %0, 0x3da" : "=r" ((tcr))); /* TCR */
+ 
+      tcr &= ~ 0x04400000;
+ 
+      tcr |= (auto_restart ? 0x04400000 : 0x04000000);
+ 
+      tick_time = get_itimer() + pit_value;
+ 
+      asm volatile ("mtspr 0x3da, %0" : "=r" ((tcr)) : "0" ((tcr))); /* TCR */
     }
     atexit(Clock_exit);
@@ -187 +188 @@
     rtems_interrupt_disable(isrlevel);
     
-    rtems_interrupt_catch(new_clock_isr, PPC_IRQ_PIT,
-                          &previous_isr);
+    rtems_interrupt_catch(new_clock_isr, PPC_IRQ_PIT, &previous_isr);
 
     rtems_interrupt_enable(isrlevel);
@@ -204 +204 @@
     if ( BSP_Configuration.ticks_per_timeslice )
     {
-        register rtems_unsigned32 tcr;
-
-        asm volatile ("mftcr %0" : "=r" ((tcr)));
-
-        tcr &= ~ 0x04400000;
-
-        asm volatile ("mttcr %0" : "=r" ((tcr)) : "0" ((tcr)));
-
-        (void) set_vector(0, PPC_IRQ_PIT, 1);
-    }
+      register rtems_unsigned32 tcr;
+ 
+      asm volatile ("mfspr %0, 0x3da" : "=r" ((tcr))); /* TCR */
+ 
+      tcr &= ~ 0x04400000;
+ 
+      asm volatile ("mtspr 0x3da, %0" : "=r" ((tcr)) : "0" ((tcr))); /* TCR */
+ 
+      (void) set_vector(0, PPC_IRQ_PIT, 1);
+    }
+
 }