bsps/leon3: Make GPTIMER fall back mandatory

Using the auto reload counter which generates the clock ticks for the
timecounter or CPU counter is quite difficult and only works in
uniprocessor configurations.

Update #4954.

1 files changed, 38 insertions, 5 deletions

diff --git a/bsps/sparc/leon3/include/bsp/leon3.h b/bsps/sparc/leon3/include/bsp/leon3.h
index fdb43b5817..ad33d73631 100644
--- a/bsps/sparc/leon3/include/bsp/leon3.h
+++ b/bsps/sparc/leon3/include/bsp/leon3.h
@@ -11,6 +11,8 @@
 /*
  * Copyright (C) 2014, 2021 embedded brains GmbH & Co. KG
  *
+ * Copyright (C) 2015 Cobham Gaisler AB
+ *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
@@ -173,13 +175,48 @@ static inline uint32_t leon3_get_cpu_count( const irqamp *regs )
   return IRQAMP_MPSTAT_NCPU_GET( grlib_load_32( &regs->mpstat ) ) + 1;
 }
 
+#if !defined(LEON3_GPTIMER_BASE)
+/**
+ * @brief This object lets the user override which on-chip GPTIMER core will be
+ *   used for system clock timer.
+ *
+ * This controls which timer core will be accociated with LEON3_Timer_Regs
+ * registers base address. This value will by destroyed during initialization.
+ *
+ * * 0 = Default configuration. GPTIMER[0]
+ *
+ * * 1 = GPTIMER[1]
+ *
+ * * 2 = GPTIMER[2]
+ *
+ * * ...
+ */
+extern int leon3_timer_core_index;
+
+/**
+ * @brief This object lets the user override system clock timer prescaler.
+ *
+ * This affects all timer instances on the system clock timer core determined
+ * by ::leon3_timer_core_index.
+ *
+ * * 0 = Default configuration. Use bootloader configured value.
+ *
+ * * N = Prescaler is set to N. N must not be less that number of timers.
+ *
+ * * 8 = Prescaler is set to 8 (the fastest prescaler possible on all HW)
+ *
+ * * ...
+ */
+extern unsigned int leon3_timer_prescaler;
+#endif
+
 /**
  * @brief This constant defines the index of the GPTIMER timer used by the
  *   clock driver.
  */
 #if defined(RTEMS_MULTIPROCESSING)
 #define LEON3_CLOCK_INDEX \
-  ( rtems_configuration_get_user_multiprocessing_table() ? LEON3_Cpu_Index : 0 )
+  ( leon3_timer_core_index != 0 ? 0 : 2 * LEON3_Cpu_Index )
 #else
 #define LEON3_CLOCK_INDEX 0
 #endif
@@ -188,11 +225,7 @@ static inline uint32_t leon3_get_cpu_count( const irqamp *regs )
  * @brief This constant defines the index of the GPTIMER timer used by the
  *   CPU counter if the CPU counter uses the GPTIMER.
  */
-#if defined(RTEMS_SMP)
 #define LEON3_COUNTER_GPTIMER_INDEX ( LEON3_CLOCK_INDEX + 1 )
-#else
-#define LEON3_COUNTER_GPTIMER_INDEX LEON3_CLOCK_INDEX
-#endif
 
 /**
  * @brief This constant defines the frequency set by the boot loader of the