Replacement for the sis bsp which supports the simulator and real

hardware.  From Jiri Gaisler <jgais@wd.estec.esa.nl>.  Supports sis
2.6 and later.

1 files changed, 262 insertions, 0 deletions

diff --git a/c/src/lib/libbsp/sparc/erc32/clock/ckinit.c b/c/src/lib/libbsp/sparc/erc32/clock/ckinit.c
new file mode 100644
index 0000000000..2a391228c7
--- /dev/null
+++ b/c/src/lib/libbsp/sparc/erc32/clock/ckinit.c
@@ -0,0 +1,262 @@
+/*
+ *  Clock Tick Device Driver
+ *
+ *  This routine initializes the Real Time Clock Counter Timer which is
+ *  part of the MEC on the ERC32 CPU.
+ *
+ *  The tick frequency is directly programmed to the configured number of
+ *  microseconds per tick.
+ *
+ *  COPYRIGHT (c) 1989, 1990, 1991, 1992, 1993, 1994.
+ *  On-Line Applications Research Corporation (OAR).
+ *  All rights assigned to U.S. Government, 1994.
+ *
+ *  This material may be reproduced by or for the U.S. Government pursuant
+ *  to the copyright license under the clause at DFARS 252.227-7013.  This
+ *  notice must appear in all copies of this file and its derivatives.
+ *
+ *  Ported to ERC32 implementation of the SPARC by On-Line Applications
+ *  Research Corporation (OAR) under contract to the European Space 
+ *  Agency (ESA).
+ *
+ *  ERC32 modifications of respective RTEMS file: COPYRIGHT (c) 1995. 
+ *  European Space Agency.
+ *
+ *  $Id$
+ */
+
+#include <stdlib.h>
+
+#include <bsp.h>
+#include <rtems/libio.h>
+
+/*
+ *  The Real Time Clock Counter Timer uses this trap type.
+ */
+
+#define CLOCK_VECTOR ERC32_TRAP_TYPE( ERC32_INTERRUPT_REAL_TIME_CLOCK )
+
+/*
+ *  Clock ticks since initialization
+ */
+
+volatile rtems_unsigned32 Clock_driver_ticks;
+
+/*
+ *  This is the value programmed into the count down timer.  It
+ *  is artificially lowered when SIMSPARC_FAST_IDLE is defined to
+ *  cut down how long we spend in the idle task while executing on
+ *  the simulator.
+ */
+
+extern rtems_unsigned32 CPU_SPARC_CLICKS_PER_TICK;
+
+rtems_isr_entry  Old_ticker;
+
+void Clock_exit( void );
+ 
+/*
+ * These are set by clock driver during its init
+ */
+ 
+rtems_device_major_number rtems_clock_major = ~0;
+rtems_device_minor_number rtems_clock_minor;
+
+/*
+ *  Clock_isr
+ *
+ *  This is the clock tick interrupt handler.
+ *
+ *  Input parameters:
+ *    vector - vector number
+ *
+ *  Output parameters:  NONE
+ *
+ *  Return values:      NONE
+ *
+ */
+
+rtems_isr Clock_isr(
+  rtems_vector_number vector
+)
+{
+  /*
+   *  If we are in "fast idle" mode, then the value for clicks per tick
+   *  is lowered to decrease the amount of time spent executing the idle
+   *  task while using the SPARC Instruction Simulator.
+   */
+
+#if SIMSPARC_FAST_IDLE
+  ERC32_MEC.Real_Time_Clock_Counter = CPU_SPARC_CLICKS_PER_TICK;
+  ERC32_MEC_Set_Real_Time_Clock_Timer_Control(
+    ERC32_MEC_TIMER_COUNTER_ENABLE_COUNTING | 
+      ERC32_MEC_TIMER_COUNTER_LOAD_COUNTER
+  );
+#endif
+
+  /*
+   *  The driver has seen another tick.
+   */
+
+  Clock_driver_ticks += 1;
+
+  /*
+   *  Real Time Clock counter/timer is set to automatically reload.
+   */
+
+  rtems_clock_tick();
+}
+
+/*
+ *  Install_clock
+ *
+ *  This routine actually performs the hardware initialization for the clock.
+ *
+ *  Input parameters:
+ *    clock_isr - clock interrupt service routine entry point
+ *
+ *  Output parameters:  NONE
+ *
+ *  Return values:      NONE
+ *
+ */
+
+extern int CLOCK_SPEED;
+
+void Install_clock(
+  rtems_isr_entry clock_isr
+)
+{
+  Clock_driver_ticks = 0;
+
+  if ( BSP_Configuration.ticks_per_timeslice ) {
+    Old_ticker = (rtems_isr_entry) set_vector( clock_isr, CLOCK_VECTOR, 1 );
+
+    /* approximately 1 us per countdown */
+    ERC32_MEC.Real_Time_Clock_Scalar  = CLOCK_SPEED - 1;
+    ERC32_MEC.Real_Time_Clock_Counter = CPU_SPARC_CLICKS_PER_TICK;
+
+    ERC32_MEC_Set_Real_Time_Clock_Timer_Control(
+      ERC32_MEC_TIMER_COUNTER_ENABLE_COUNTING | 
+        ERC32_MEC_TIMER_COUNTER_LOAD_SCALER | 
+        ERC32_MEC_TIMER_COUNTER_LOAD_COUNTER 
+    );
+ 
+    ERC32_MEC_Set_Real_Time_Clock_Timer_Control(
+      ERC32_MEC_TIMER_COUNTER_ENABLE_COUNTING |
+        ERC32_MEC_TIMER_COUNTER_RELOAD_AT_ZERO 
+    );
+
+    atexit( Clock_exit );
+  }
+
+}
+
+/*
+ *  Clock_exit
+ *
+ *  This routine allows the clock driver to exit by masking the interrupt and
+ *  disabling the clock's counter.
+ *
+ *  Input parameters:   NONE
+ *
+ *  Output parameters:  NONE
+ *
+ *  Return values:      NONE
+ *
+ */
+
+void Clock_exit( void )
+{
+  if ( BSP_Configuration.ticks_per_timeslice ) {
+    ERC32_Mask_interrupt( ERC32_INTERRUPT_REAL_TIME_CLOCK );
+
+    ERC32_MEC_Set_Real_Time_Clock_Timer_Control(
+      ERC32_MEC_TIMER_COUNTER_DISABLE_COUNTING 
+    );
+
+    /* do not restore old vector */
+  }
+}
+ 
+/*
+ *  Clock_initialize
+ *
+ *  This routine initializes the clock driver.
+ *
+ *  Input parameters:
+ *    major - clock device major number
+ *    minor - clock device minor number
+ *    parg  - pointer to optional device driver arguments
+ *
+ *  Output parameters:  NONE
+ *
+ *  Return values:
+ *    rtems_device_driver status code
+ */
+
+rtems_device_driver Clock_initialize(
+  rtems_device_major_number major,
+  rtems_device_minor_number minor,
+  void *pargp
+)
+{
+  Install_clock( Clock_isr );
+ 
+  /*
+   * make major/minor avail to others such as shared memory driver
+   */
+ 
+  rtems_clock_major = major;
+  rtems_clock_minor = minor;
+ 
+  return RTEMS_SUCCESSFUL;
+}
+ 
+/*
+ *  Clock_control
+ *
+ *  This routine is the clock device driver control entry point.
+ *
+ *  Input parameters:
+ *    major - clock device major number
+ *    minor - clock device minor number
+ *    parg  - pointer to optional device driver arguments
+ *
+ *  Output parameters:  NONE
+ *
+ *  Return values:
+ *    rtems_device_driver status code
+ */
+
+rtems_device_driver Clock_control(
+  rtems_device_major_number major,
+  rtems_device_minor_number minor,
+  void *pargp
+)
+{
+    rtems_unsigned32 isrlevel;
+    rtems_libio_ioctl_args_t *args = pargp;
+ 
+    if (args == 0)
+        goto done;
+ 
+    /*
+     * This is hokey, but until we get a defined interface
+     * to do this, it will just be this simple...
+     */
+ 
+    if (args->command == rtems_build_name('I', 'S', 'R', ' '))
+    {
+        Clock_isr(CLOCK_VECTOR);
+    }
+    else if (args->command == rtems_build_name('N', 'E', 'W', ' '))
+    {
+      rtems_interrupt_disable( isrlevel );
+       (void) set_vector( args->buffer, CLOCK_VECTOR, 1 );
+      rtems_interrupt_enable( isrlevel );
+    }
+ 
+done:
+    return RTEMS_SUCCESSFUL;
+}