1 files changed, 159 insertions, 0 deletions
diff --git a/c/src/lib/libbsp/arm/tms570/clock/clock.c b/c/src/lib/libbsp/arm/tms570/clock/clock.c
new file mode 100644
index 0000000000..2a8bb5f4a6
--- /dev/null
+++ b/c/src/lib/libbsp/arm/tms570/clock/clock.c
@@ -0,0 +1,159 @@
+/**
+ * @file clock.c
+ *
+ * @ingroup tms570
+ *
+ * @brief clock functions definitions.
+ */
+
+/*
+ * Copyright (c) 2014 Premysl Houdek <kom541000@gmail.com>
+ *
+ * Google Summer of Code 2014 at
+ * Czech Technical University in Prague
+ * Zikova 1903/4
+ * 166 36 Praha 6
+ * Czech Republic
+ *
+ * Based on LPC24xx and LPC1768 BSP
+ * by embedded brains GmbH and others
+ *
+ * The license and distribution terms for this file may be
+ * found in the file LICENSE in this distribution or at
+ * http://www.rtems.org/license/LICENSE.
+ */
+
+#include <stdlib.h>
+
+#include <rtems.h>
+#include <bsp.h>
+#include <bsp/irq.h>
+#include <bsp/tms570-rti.h>
+
+/**
+ *  holds HW counter value since last interrupt event
+ *  sets in tms570_clock_driver_support_at_tick
+ *  used in tms570_clock_driver_nanoseconds_since_last_tick
+ */
+static uint32_t tms570_rti_last_tick_fcr0;
+
+/**
+ *  @brief Initialize the HW peripheral for clock driver
+ *
+ *  Clock driver is implemented by RTI module
+ *
+ * @retval Void
+ */
+static void tms570_clock_driver_support_initialize_hardware( void )
+{
+
+  uint32_t microsec_per_tick = rtems_configuration_get_microseconds_per_tick();
+
+  /* Hardware specific initialize */
+  TMS570_RTI.RTIGCTRL = 0;
+  TMS570_RTI.RTICPUC0 = BSP_PLL_OUT_CLOCK /1000000 / 2; /* prescaler */
+  TMS570_RTI.RTITBCTRL = 2;
+  TMS570_RTI.RTICAPCTRL = 0;
+  TMS570_RTI.RTICOMPCTRL = 0;
+  /* set counter to zero */
+  TMS570_RTI.RTIUC0 = 0;
+  TMS570_RTI.RTIFRC0 = 0;
+  /* clear interrupts*/
+  TMS570_RTI.RTICLEARINTENA = 0x00070f0f;
+  TMS570_RTI.RTIINTFLAG = 0x0007000f;
+  /* set timer */
+  TMS570_RTI.RTICOMP0 = TMS570_RTI.RTIFRC0 + microsec_per_tick;
+  TMS570_RTI.RTICOMP0CLR = TMS570_RTI.RTICOMP0 + microsec_per_tick / 2;
+  TMS570_RTI.RTIUDCP0 = microsec_per_tick;
+  /* enable interupt */
+  TMS570_RTI.RTISETINTENA = 0x1;
+  /* enable timer */
+  TMS570_RTI.RTIGCTRL = 1;
+}
+
+/**
+ * @brief Clears interrupt source
+ *
+ * @retval Void
+ */
+static void tms570_clock_driver_support_at_tick( void )
+{
+  TMS570_RTI.RTIINTFLAG = 0x00000001;
+  tms570_rti_last_tick_fcr0 = TMS570_RTI.RTICOMP0 - TMS570_RTI.RTIUDCP0;
+  /* TMS570_RTI.RTICOMP0 += 1000; */
+}
+
+/**
+ * @brief registers RTI interrupt handler
+ *
+ * @param[in] Clock_isr new ISR handler
+ * @param[in] Old_ticker old ISR handler (unused and type broken)
+ *
+ * @retval Void
+ */
+static void tms570_clock_driver_support_install_isr(
+  rtems_isr_entry Clock_isr
+)
+{
+  rtems_status_code sc = RTEMS_SUCCESSFUL;
+
+  sc = rtems_interrupt_handler_install(
+    TMS570_IRQ_TIMER_0,
+    "Clock",
+    RTEMS_INTERRUPT_UNIQUE,
+    (rtems_interrupt_handler) Clock_isr,
+    NULL
+  );
+  if ( sc != RTEMS_SUCCESSFUL ) {
+    rtems_fatal_error_occurred(0xdeadbeef);
+  }
+}
+
+/**
+ * @brief disables RTI interrupt
+ *
+ * Called when closing clock driver
+ *
+ * @retval Void
+ */
+static void tms570_clock_driver_support_shutdown_hardware( void )
+{
+  /* turn off the timer interrupts */
+  TMS570_RTI.RTICLEARINTENA = 0x20000;
+}
+
+/**
+ * @brief returns the nanoseconds since last tick
+ *
+ * Return the nanoseconds since last tick
+ *
+ * @retval x nanoseconds
+ *
+ */
+static uint32_t tms570_clock_driver_nanoseconds_since_last_tick( void )
+{
+  uint32_t actual_fcr0 = TMS570_RTI.RTIFRC0;
+  uint32_t usec_since_tick;
+
+  usec_since_tick = actual_fcr0 - tms570_rti_last_tick_fcr0;
+
+  return usec_since_tick * 1000;
+}
+
+#define Clock_driver_support_initialize_hardware \
+                        tms570_clock_driver_support_initialize_hardware
+#define Clock_driver_support_at_tick \
+                        tms570_clock_driver_support_at_tick
+#define Clock_driver_support_initialize_hardware \
+                        tms570_clock_driver_support_initialize_hardware
+#define Clock_driver_support_shutdown_hardware \
+                        tms570_clock_driver_support_shutdown_hardware
+#define Clock_driver_nanoseconds_since_last_tick \
+                        tms570_clock_driver_nanoseconds_since_last_tick
+
+#define Clock_driver_support_install_isr(Clock_isr, Old_ticker ) \
+              tms570_clock_driver_support_install_isr( Clock_isr )
+
+void Clock_isr(void *arg); /* to supress warning */
+
+#include "../../../shared/clockdrv_shell.h"