1 files changed, 101 insertions, 0 deletions

diff --git a/firmware/target/mips/ingenic_jz47xx/timer-jz4760.c b/firmware/target/mips/ingenic_jz47xx/timer-jz4760.c
new file mode 100644
index 0000000000..0f16825b34
--- /dev/null
+++ b/firmware/target/mips/ingenic_jz47xx/timer-jz4760.c
@@ -0,0 +1,101 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2016 by Roman Stolyarov
+ *
+ * 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"
+
+/* Interrupt handler */
+void TCU1(void)
+{
+    __tcu_clear_full_match_flag(5);
+
+    if (pfn_timer != NULL)
+        pfn_timer();
+}
+
+bool timer_set(long cycles, bool start)
+{
+    unsigned int divider = cycles, prescaler_bit = 0, prescaler = 1, old_irq;
+
+    if(cycles < 1)
+        return false;
+
+    if(start && pfn_unregister != NULL)
+    {
+        pfn_unregister();
+        pfn_unregister = NULL;
+    }
+
+    /* Increase prescale values starting from 0 to make the cycle count fit */
+    while(divider > 65535 && prescaler <= 1024)
+    {
+        prescaler <<= 2; /* 1, 4, 16, 64, 256, 1024 */
+        prescaler_bit++;
+        divider = cycles / prescaler;
+    }
+
+    old_irq = disable_irq_save();
+
+    __tcu_stop_counter(5);
+    if(start)
+    {
+        __tcu_disable_pwm_output(5);
+
+        __tcu_mask_half_match_irq(5); 
+        __tcu_unmask_full_match_irq(5);
+
+        /* EXTAL clock = CFG_EXTAL (12Mhz in most targets) */
+        __tcu_select_extalclk(5);
+    }
+
+    REG_TCU_TCSR(5) = (REG_TCU_TCSR(5) & ~TCSR_PRESCALE_MASK) | (prescaler_bit << TCSR_PRESCALE_LSB);
+    REG_TCU_TCNT(5) = 0;
+    REG_TCU_TDHR(5) = 0;
+    REG_TCU_TDFR(5) = divider;
+
+    __tcu_clear_full_match_flag(5);
+
+    if(start)
+    {
+        system_enable_irq(IRQ_TCU1);
+        __tcu_start_counter(5);
+    }
+
+    restore_irq(old_irq);
+
+    return true;
+}
+
+bool timer_start(void)
+{
+    __tcu_start_counter(5);
+
+    return true;
+}
+
+void timer_stop(void)
+{
+    unsigned int old_irq = disable_irq_save();
+    __tcu_stop_counter(5);
+    restore_irq(old_irq);
+}