1 files changed, 125 insertions, 0 deletions
diff --git a/nuttx/arch/arm/src/c5471/c5471_timerisr.c b/nuttx/arch/arm/src/c5471/c5471_timerisr.c
new file mode 100644
index 0000000000..e37043173e
--- /dev/null
+++ b/nuttx/arch/arm/src/c5471/c5471_timerisr.c
@@ -0,0 +1,125 @@
+/************************************************************
+ * c5471/c5471_timerisr.c
+ *
+ *   Copyright (C) 2007 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name Gregory Nutt nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ************************************************************/
+
+/************************************************************
+ * Included Files
+ ************************************************************/
+
+#include <nuttx/config.h>
+#include <sys/types.h>
+#include <debug.h>
+#include <nuttx/arch.h>
+#include "clock_internal.h"
+#include "up_internal.h"
+#include "up_arch.h"
+
+/************************************************************
+ * Definitions
+ ************************************************************/
+
+/* We want the general purpose timer running at the rate
+ * MSEC_PER_TICK. The C5471 clock is 47.5MHz and we're using
+ * a timer PTV value of 3 (3 == divide incoming frequency by
+ * 16) which then yields a 16 bitCLKS_PER_INT value
+ * of 29687.
+ *
+ *   47500000 / 16 = 2968750 clocks/sec
+ *   2968750 / 100 = 29687   clocks/ 100Hz interrupt
+ *
+ */
+
+#define CLKS_PER_INT       29687
+#define CLKS_PER_INT_SHIFT 5
+#define AR                 0x00000010
+#define ST                 0x00000008
+#define PTV                0x00000003
+
+/************************************************************
+ * Private Types
+ ************************************************************/
+
+/************************************************************
+ * Private Function Prototypes
+ ************************************************************/
+
+/************************************************************
+ * Global Functions
+ ************************************************************/
+
+/************************************************************
+ * Function:  up_timerisr
+ *
+ * Description:
+ *   The timer ISR will perform a variety of services for
+ *   various portions of the systems.
+ *
+ ************************************************************/
+
+int up_timerisr(int irq, uint32 *regs)
+{
+   /* Process timer interrupt */
+
+   sched_process_timer();
+   return 0;
+}
+
+/************************************************************
+ * Function:  up_timerinit
+ *
+ * Description:
+ *   This function is called during start-up to initialize
+ *   the timer interrupt.
+ *
+ ************************************************************/
+
+void up_timerinit(void)
+{
+  uint32 val;
+
+  up_disable_irq(C5471_IRQ_SYSTIMER);
+
+  /* Start the general purpose timer running in auto-reload mode
+   * so that an interrupt is generated at the rate MSEC_PER_TICK.
+   */
+
+  val = ((CLKS_PER_INT-1) << CLKS_PER_INT_SHIFT) | AR | ST | PTV;
+  putreg32(val, C5471_TIMER2_CTRL);
+
+  /* Attach and enable the timer interrupt */
+
+  irq_attach(C5471_IRQ_SYSTIMER, (xcpt_t)up_timerisr);
+  up_enable_irq(C5471_IRQ_SYSTIMER);
+}
+