1 files changed, 123 insertions, 0 deletions
diff --git a/firmware/target/arm/at91sam/lyre_proto1/timer-lyre_proto1.c b/firmware/target/arm/at91sam/lyre_proto1/timer-lyre_proto1.c
new file mode 100644
index 0000000000..5924438d10
--- /dev/null
+++ b/firmware/target/arm/at91sam/lyre_proto1/timer-lyre_proto1.c
@@ -0,0 +1,123 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ *
+ *
+ * Copyright (C) 2009 by Jorge Pinto
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+
+#include "config.h"
+#include "cpu.h"
+#include "system.h"
+#include "timer.h"
+#include "logf.h"
+#include "at91sam9260.h"
+
+/*-----------------------------------------------------------------------------
+ * Function Name       : pitc_handler
+ * Object              : Handler for PITC interrupt
+ *---------------------------------------------------------------------------*/
+void pitc_handler(void)
+{
+    unsigned long pivr = 0;
+    unsigned long pisr = 0;
+
+    /* Read the PISR */
+    pisr = AT91C_PITC_PISR & AT91C_PITC_PITS;
+
+    if (pisr != 0)
+    {
+        /* Read the PIVR. It acknowledges the IT */
+        pivr = AT91C_PITC_PIVR;
+
+        if (pfn_timer != NULL)
+            pfn_timer();
+    }
+}
+
+bool __timer_set(long cycles, bool start)
+{
+    if (cycles < 1000) /* Max value on PITC?? */
+    {
+        if (start && pfn_unregister != NULL)
+        {
+            pfn_unregister();
+            pfn_unregister = NULL;
+        }
+
+        /* Configure a resolution of <cycles> ms */
+        AT91C_PITC_PIMR = MCK_FREQ / ( 16 * cycles) - 1;
+
+        return true;
+    }
+
+    return false;
+}
+
+bool __timer_register(void)
+{
+    bool retval = true;
+    volatile unsigned long pimr = 0;
+
+    /* Configure a resolution of 1 ms */
+    AT91C_PITC_PIMR = MCK_FREQ / (16 * 1000) - 1;
+
+    /* Enable interrupts */
+    /* Disable the interrupt on the interrupt controller */
+    AT91C_AIC_IDCR = (1 << AT91C_ID_SYS);
+
+    /* Save the interrupt handler routine pointer and the interrupt priority */
+    AT91C_AIC_SVR(AT91C_ID_SYS) = (unsigned long) pitc_handler;
+    /* Store the Source Mode Register */
+    AT91C_AIC_SMR(AT91C_ID_SYS) = AT91C_AIC_SRCTYPE_INT_LEVEL_SENSITIVE | \
+    AT91C_AIC_PRIOR_LOWEST;
+    /* Clear the interrupt on the interrupt controller */
+    AT91C_AIC_ICCR = (1 << AT91C_ID_SYS);
+
+    /* Enable the interrupt on the interrupt controller */
+    AT91C_AIC_IECR = (1 << AT91C_ID_SYS);
+
+    /* Enable the interrupt on the pit */
+    pimr = AT91C_PITC_PIMR;
+    AT91C_PITC_PIMR = pimr | AT91C_PITC_PITIEN;
+
+    /* Enable the pit */
+    pimr = AT91C_PITC_PIMR;
+    AT91C_PITC_PIMR = pimr | AT91C_PITC_PITEN;
+
+    return retval;
+}
+
+void __timer_unregister(void)
+{
+    volatile unsigned long pimr = 0;
+
+    /* Disable the interrupt on the interrupt controller */
+    AT91C_AIC_IDCR = (1 << AT91C_ID_SYS);
+
+    /* Clear the interrupt on the interrupt controller */
+    AT91C_AIC_ICCR = (1 << AT91C_ID_SYS);
+
+    /* Disable the interrupt on the pit */
+    pimr = AT91C_PITC_PIMR;
+    pimr &= ~AT91C_PITC_PITIEN;
+    AT91C_PITC_PIMR = pimr;
+
+    /* Disable the pit */
+    pimr = AT91C_PITC_PIMR;
+    pimr &= ~AT91C_PITC_PITEN;
+    AT91C_PITC_PIMR = pimr;
+}