From 590501cfe404b5463adecc70628e5bc7c8f142a2 Mon Sep 17 00:00:00 2001
From: Will Robertson <aliask@rockbox.org>
Date: Fri, 21 Sep 2007 15:51:53 +0000
Subject: Merge the Gigabeat S branch back into trunk. Fingers crossed nothing
 breaks.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@14805 a1c6a512-1295-4272-9138-f99709370657
---
 firmware/kernel.c | 49 +++++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 47 insertions(+), 2 deletions(-)

(limited to 'firmware/kernel.c')

diff --git a/firmware/kernel.c b/firmware/kernel.c
index bb67ced64d..11b10e287e 100644
--- a/firmware/kernel.c
+++ b/firmware/kernel.c
@@ -24,8 +24,11 @@
 #include "cpu.h"
 #include "system.h"
 #include "panic.h"
+#if CONFIG_CPU == IMX31L
+#include "avic-imx31.h"
+#endif
 
-#if !defined(CPU_PP) || !defined(BOOTLOADER) 
+#if (!defined(CPU_PP) && (CONFIG_CPU != IMX31L)) || !defined(BOOTLOADER) 
 volatile long current_tick NOCACHEDATA_ATTR = 0;
 #endif
 
@@ -83,7 +86,7 @@ void sleep(int ticks)
 
 void yield(void)
 {
-#if ((CONFIG_CPU == S3C2440 || defined(ELIO_TPJ1022)) && defined(BOOTLOADER))
+#if ((CONFIG_CPU == S3C2440 || defined(ELIO_TPJ1022) || CONFIG_CPU == IMX31L) && defined(BOOTLOADER))
     /* Some targets don't like yielding in the bootloader */
 #else
     switch_thread(true, NULL);
@@ -708,6 +711,48 @@ void tick_start(unsigned int interval_in_ms)
 
     TIMER0.ctrl |= 0x80;  /* Enable the counter */
 }
+#elif CONFIG_CPU == IMX31L
+void tick_start(unsigned int interval_in_ms)
+{
+    EPITCR1 &= ~0x1;        /* Disable the counter */
+
+    EPITCR1 &= ~0xE;        /* Disable interrupt, count down from 0xFFFFFFFF */
+    EPITCR1 &= ~0xFFF0;     /* Clear prescaler */
+#ifdef BOOTLOADER
+    EPITCR1 |= (2700 << 2); /* Prescaler = 2700 */
+#endif
+    EPITCR1 &= ~(0x3 << 24);
+    EPITCR1 |= (0x2 << 24); /* Set clock source to external clock (27mhz) */
+    EPITSR1 = 1;            /* Clear the interrupt request */
+#ifndef BOOTLOADER
+    EPITLR1 = 27000000 * interval_in_ms / 1000;
+    EPITCMPR1 = 27000000 * interval_in_ms / 1000;
+#else
+    (void)interval_in_ms;
+#endif
+
+    //avic_enable_int(EPIT1, IRQ, EPIT_HANDLER);
+
+    EPITCR1 |= 0x1;           /* Enable the counter */
+}
+
+#ifndef BOOTLOADER
+void EPIT_HANDLER(void) __attribute__((interrupt("IRQ")));
+void EPIT_HANDLER(void) {
+    int i;
+
+    /* Run through the list of tick tasks */
+    for(i = 0;i < MAX_NUM_TICK_TASKS;i++)
+    {
+        if(tick_funcs[i])
+            tick_funcs[i]();
+    }
+
+    current_tick++;
+
+    EPITSR1 = 1;            /* Clear the interrupt request */
+}
+#endif
 #endif
 
 int tick_add_task(void (*f)(void))
-- 
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