1 files changed, 195 insertions, 0 deletions
diff --git a/c/src/lib/libbsp/i386/ts_386ex/timer/timer.c b/c/src/lib/libbsp/i386/ts_386ex/timer/timer.c
new file mode 100644
index 0000000000..fbbe92e347
--- /dev/null
+++ b/c/src/lib/libbsp/i386/ts_386ex/timer/timer.c
@@ -0,0 +1,195 @@
+/*  Timer_init()
+ *
+ *  This routine initializes the timer on the FORCE CPU-386 board.
+ *
+ *  Input parameters:  NONE
+ *
+ *  Output parameters:  NONE
+ *
+ *  NOTE: This routine will not work if the optimizer is enabled
+ *        for some compilers.  The multiple writes to the Z8036
+ *        may be optimized away.
+ *
+ *        It is important that the timer start/stop overhead be
+ *        determined when porting or modifying this code.
+ *
+ *  COPYRIGHT (c) 1989-1998.
+ *  On-Line Applications Research Corporation (OAR).
+ *  Copyright assigned to U.S. Government, 1994.
+ *
+ *  The license and distribution terms for this file may be
+ *  found in the file LICENSE in this distribution or at
+ *  http://www.OARcorp.com/rtems/license.html.
+ *
+ *  $Id$
+ */
+
+
+#include <rtems.h>
+#include <bsp.h>
+#include <stdlib.h>
+
+volatile rtems_unsigned32  Ttimer_val;  /* Updated from ISR!!! */
+rtems_boolean Timer_driver_Find_average_overhead;
+
+extern void timerisr();
+
+/* 
+ * Number of us per timer interrupt. Note: 1 us == 1 tick.
+ */
+
+#define  US_PER_ISR   250
+
+void TimerOn(const rtems_raw_irq_connect_data* used)
+{
+
+  Ttimer_val = 0;                           /* clear timer ISR count */
+
+  /* Select timer, stay in mode 0 */
+  outport_byte (TIMER_MODE, TIMER_SEL0|TIMER_16BIT|TIMER_RATEGEN);
+
+  /* Set to 250 usec interval */
+  outport_byte (TIMER_CNTR0, US_PER_ISR & 0xFF );
+  outport_byte (TIMER_CNTR0, (US_PER_ISR >> 8) & 0xFF );
+
+  /* Enable all timers */
+  outport_byte (TIMER_CONFIG, 0x00);
+
+  /*
+   * enable interrrupt at i8259 level
+   */
+  BSP_irq_enable_at_i8259s(used->idtIndex - BSP_IRQ_VECTOR_BASE);
+}
+
+static int TimerIsOn (const rtems_raw_irq_connect_data *used)
+{
+  return BSP_irq_enabled_at_i8259s(used->idtIndex - BSP_IRQ_VECTOR_BASE);
+}
+
+void TimerOff(const rtems_raw_irq_connect_data* used)
+{
+  /* Disable all timers */
+  outport_byte (TIMER_CONFIG, 0x80);
+
+  /*
+   * disable interrrupt at i8259 level
+   */
+  BSP_irq_disable_at_i8259s(used->idtIndex - BSP_IRQ_VECTOR_BASE);
+  /* reset timer mode to standard (DOS) value */
+}
+
+static rtems_raw_irq_connect_data timer_raw_irq_data = {
+  BSP_PERIODIC_TIMER + BSP_IRQ_VECTOR_BASE,
+  timerisr,
+  TimerOn,
+  TimerOff,
+  TimerIsOn
+};
+
+static rtems_raw_irq_connect_data old_raw_irq_data = {
+  BSP_PERIODIC_TIMER + BSP_IRQ_VECTOR_BASE,
+};  
+
+void Timer_exit()
+{
+ if (!i386_delete_idt_entry(&timer_raw_irq_data)) {
+      printk("Timer_exit:Timer raw handler removal failed\n");
+      rtems_fatal_error_occurred(1);
+ }
+}
+
+void Timer_initialize(void)
+{
+
+  static rtems_boolean First = TRUE;
+
+  if (First)
+  {
+    First = FALSE;
+
+    if (!i386_get_current_idt_entry (&old_raw_irq_data)) {
+      printk("Timer_initialize: failed to get old raw irq entry.\n");
+      rtems_fatal_error_occurred(1);
+    }
+
+    if (!i386_delete_idt_entry (&old_raw_irq_data)) {
+      printk("Timer_initialize: failed to delete old raw irq entry.\n");
+      rtems_fatal_error_occurred(1);
+    }
+
+    atexit(Timer_exit); /* Try not to hose the system at exit. */
+    if (!i386_set_idt_entry (&timer_raw_irq_data)) {
+      printk("Timer_initialize: raw handler installation failed.\n");
+      rtems_fatal_error_occurred(1);
+    }
+  }
+
+  /* wait for ISR to be called at least once */
+  Ttimer_val = 0;
+  while (Ttimer_val == 0)
+    continue;
+  Ttimer_val = 0;
+}
+
+
+#define AVG_OVERHEAD      3  /* It typically takes 3.0 microseconds */
+                             /* (3 ticks) to start/stop the timer. */
+#define LEAST_VALID       4  /* Don't trust a value lower than this */
+
+int Read_timer(void)
+{
+  register rtems_unsigned32 clicks, total;
+  register rtems_unsigned8 lsb, msb;
+
+  /* latch the count */
+  outport_byte (TIMER_MODE, TIMER_SEL0|TIMER_LATCH );
+
+  /* read the count */ 
+  inport_byte (TIMER_CNTR0, lsb );
+  inport_byte (TIMER_CNTR0, msb );
+
+  /*
+   * Timer ISR increments Ttimer_val every US_PER_ISR clock ticks,
+   * where 1 tick == 1 us. Below, 'click' is in microseconds.
+   *
+   * This assumes the timer input clocks are sourced from the system's
+   * prescaled clock (PSCLK), which is set to be at 1MHz.
+   */
+  clicks = (msb << 8) | lsb;
+  total = Ttimer_val * US_PER_ISR + (US_PER_ISR - clicks);
+
+  if ( Timer_driver_Find_average_overhead == 1 )
+    return total;          /* in one microsecond units */
+  else if ( total < LEAST_VALID )
+    return 0;            /* below timer resolution */
+  else
+    return (total - AVG_OVERHEAD);
+}
+
+rtems_status_code Empty_function( void )
+{
+  return RTEMS_SUCCESSFUL;
+}
+
+void Set_find_average_overhead(
+  rtems_boolean find_flag
+)
+{
+  Timer_driver_Find_average_overhead = find_flag;
+}
+
+/*
+ *  Wait_X_ms: a delay loop used by the network driver...
+ */
+
+#define SLOW_DOWN_IO  0x80      /* I/O port which does nothing */
+#define LOOP1MS        320      /* Just a guess....  */
+
+void Wait_X_ms (unsigned timeToWait)
+{
+  unsigned i, j;
+
+  for (j=0; j<timeToWait; j++)
+    for (i=0; i<LOOP1MS; i++)
+      outport_byte (SLOW_DOWN_IO, 0);
+}