1 files changed, 127 insertions, 0 deletions

diff --git a/firmware/target/arm/s3c2440/gigabeat-fx/timer-meg-fx.c b/firmware/target/arm/s3c2440/gigabeat-fx/timer-meg-fx.c
new file mode 100644
index 0000000000..4654c7c845
--- /dev/null
+++ b/firmware/target/arm/s3c2440/gigabeat-fx/timer-meg-fx.c
@@ -0,0 +1,127 @@
+/***************************************************************************
+*             __________               __   ___.
+*   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+*   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+*   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+*   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+*                     \/            \/     \/    \/            \/
+* $Id$
+*
+* Copyright (C) 2007 by Michael Sevakis
+*
+* All files in this archive are subject to the GNU General Public License.
+* See the file COPYING in the source tree root for full license agreement.
+*
+* 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"
+
+/* GPB0/TOUT0 should already have been configured as output so that pin
+   should not be a functional pin and TIMER0 output unseen there */
+void TIMER0(void)
+{
+    if (pfn_timer != NULL)
+        pfn_timer();
+
+    SRCPND = TIMER0_MASK;
+    INTPND = TIMER0_MASK;
+}
+
+static void stop_timer(void)
+{
+    /* mask interrupt */
+    INTMSK |= TIMER0_MASK;
+
+    /* stop any running TIMER0 */
+    TCON &= ~(1 << 0);
+
+    /* clear pending */
+    SRCPND = TIMER0_MASK;
+    INTPND = TIMER0_MASK;
+}
+
+bool __timer_set(long cycles, bool start)
+{
+    bool retval = false;
+
+    /* Find the minimum factor that puts the counter in range 1-65535 */
+    unsigned int prescaler = (cycles + 65534) / 65535;
+
+    /* Maximum divider setting is x / 256 / 16 = x / 4096 */
+    if (prescaler <= 4096)
+    {
+        int oldlevel;
+        unsigned int divider;
+
+        if (start && pfn_unregister != NULL)
+        {
+            pfn_unregister();
+            pfn_unregister = NULL;
+        }
+
+        oldlevel = set_irq_level(HIGHEST_IRQ_LEVEL);
+
+        TCMPB0 = 0;
+        TCNTB0 = (unsigned int)cycles / prescaler;
+
+        /* Max prescale is 255+1 */
+        for (divider = 0; prescaler > 256; prescaler >>= 1, divider++);
+
+        TCFG0 = (TCFG0 & ~0xff) | (prescaler - 1);
+        TCFG1 = (TCFG1 & ~0xf) | divider;
+
+        set_irq_level(oldlevel);
+
+        retval = true;
+    }
+
+    return retval;
+}
+
+bool __timer_register(void)
+{
+    bool retval = true;
+
+    int oldstatus = set_interrupt_status(IRQ_FIQ_DISABLED, IRQ_FIQ_STATUS);
+
+    stop_timer();
+
+    /* neurosis - make sure something didn't set GPB0 to TOUT0 */
+    if ((GPBCON & 0x3) != 0x2)
+    {
+        /* manual update: on (to reset count) */
+        TCON |= (1 << 1);
+        /* dead zone: off, inverter: off, manual off */
+        TCON &= ~((1 << 4) | (1 << 2) | (1 << 1));
+        /* interval mode (auto reload): on */
+        TCON |= (1 << 3);
+        /* start timer */
+        TCON |= (1 << 0);
+        /* unmask interrupt */
+        INTMSK &= ~TIMER0_MASK;
+    }
+
+    if (!(TCON & (1 << 0)))
+    {
+        /* timer could not be started due to config error */
+        logf("Timer error: GPB0 set to TOUT0");
+        retval = false;
+    }
+
+    set_interrupt_status(oldstatus, IRQ_FIQ_STATUS);
+
+    return retval;
+}
+
+void __timer_unregister(void)
+{
+    int oldstatus = set_interrupt_status(IRQ_FIQ_DISABLED, IRQ_FIQ_STATUS);
+    stop_timer();
+    set_interrupt_status(oldstatus, IRQ_FIQ_STATUS);
+}