From 5db6b51759fa1b2e9595a177414874fc928d5180 Mon Sep 17 00:00:00 2001
From: Karl Kurbjun <kkurbjun@gmail.com>
Date: Wed, 7 Nov 2007 05:30:31 +0000
Subject: Get the user timer working properly consequentially fixing doom
 without a hack.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@15510 a1c6a512-1295-4272-9138-f99709370657
---
 firmware/target/arm/tms320dm320/kernel-dm320.c |  2 +-
 firmware/target/arm/tms320dm320/system-dm320.c |  4 ++
 firmware/target/arm/tms320dm320/timer-dm320.c  | 52 +++++++++++---------------
 3 files changed, 27 insertions(+), 31 deletions(-)

(limited to 'firmware')

diff --git a/firmware/target/arm/tms320dm320/kernel-dm320.c b/firmware/target/arm/tms320dm320/kernel-dm320.c
index be2b14b3cb..6608aea096 100644
--- a/firmware/target/arm/tms320dm320/kernel-dm320.c
+++ b/firmware/target/arm/tms320dm320/kernel-dm320.c
@@ -32,7 +32,7 @@ void tick_start(unsigned int interval_in_ms)
     /*  Setup the Prescalar (Divide by 10)
      *  Based on linux/include/asm-arm/arch-integrator/timex.h 
      */
-    IO_TIMER1_TMPRSCL = 0x000A;
+    IO_TIMER1_TMPRSCL = 0x0009;
 
     /* Setup the Divisor */
     IO_TIMER1_TMDIV = (TIMER_FREQ / (10*1000))*interval_in_ms;
diff --git a/firmware/target/arm/tms320dm320/system-dm320.c b/firmware/target/arm/tms320dm320/system-dm320.c
index c009766f21..da3b9913a2 100644
--- a/firmware/target/arm/tms320dm320/system-dm320.c
+++ b/firmware/target/arm/tms320dm320/system-dm320.c
@@ -169,6 +169,10 @@ void system_init(void)
 
     IO_INTC_ENTRY_TBA0 = 0;
     IO_INTC_ENTRY_TBA1 = 0;
+    
+    /* Turn off other timers */
+    IO_TIMER2_TMMD = CONFIG_TIMER2_TMMD_STOP;
+    IO_TIMER3_TMMD = CONFIG_TIMER3_TMMD_STOP;
 
     /* set GIO26 (reset pin) to output and low */
     IO_GIO_BITCLR1=(1<<10);
diff --git a/firmware/target/arm/tms320dm320/timer-dm320.c b/firmware/target/arm/tms320dm320/timer-dm320.c
index 21449ed19f..482fef9f12 100644
--- a/firmware/target/arm/tms320dm320/timer-dm320.c
+++ b/firmware/target/arm/tms320dm320/timer-dm320.c
@@ -32,32 +32,16 @@ void TIMER0(void)
     IO_INTC_IRQ0 |= 1<<IRQ_TIMER0;
 }
 
-static void stop_timer(void)
-{
-    IO_INTC_EINT0 &= ~(1<<IRQ_TIMER0);
-
-    IO_INTC_IRQ0 |= 1<<IRQ_TIMER0;
-    
-    IO_TIMER0_TMMD = CONFIG_TIMER0_TMMD_STOP;
-}
-
 bool __timer_set(long cycles, bool start)
 {
     int oldlevel;
-    unsigned int divider;
-    /* taken from linux/arch/arm/mach-itdm320-20/time.c and timer-meg-fx.c */
+    unsigned int divider=cycles, prescaler=0;
 
-  	/* Turn off all timers */
-    IO_TIMER0_TMMD = CONFIG_TIMER0_TMMD_STOP;
-	IO_TIMER1_TMMD = CONFIG_TIMER1_TMMD_STOP;
-	IO_TIMER2_TMMD = CONFIG_TIMER2_TMMD_STOP;
-	IO_TIMER3_TMMD = CONFIG_TIMER3_TMMD_STOP;
+    if(cycles<1)
+        return false;
 
-    /* Find the minimum factor that puts the counter in range 1-65535 */
-    unsigned int prescaler = (cycles + 65534) / 65535;
+    IO_TIMER0_TMMD = CONFIG_TIMER0_TMMD_STOP;
 
-    /* Test this by writing 1's to registers to see how many bits we have */
-    /* Maximum divider setting is x / 1024 / 65536 = x / 67108864 */
     if (start && pfn_unregister != NULL)
     {
         pfn_unregister();
@@ -66,13 +50,14 @@ bool __timer_set(long cycles, bool start)
 
     oldlevel = set_irq_level(HIGHEST_IRQ_LEVEL);
 
-    /* Max prescale is 1023+1 */
-    for (divider = 0; prescaler > 1024; prescaler >>= 1, divider++);
+    /* Increase prescale values starting from 0 to make the cycle count fit */
+    while(divider>65535 && prescaler<1024)
+    {
+        prescaler++;
+        divider=cycles/(prescaler+1);
+    }
 
-    /* Setup the Prescalar */
     IO_TIMER0_TMPRSCL = prescaler;
-
-    /* Setup the Divisor */
     IO_TIMER0_TMDIV = divider;
 
     set_irq_level(oldlevel);
@@ -80,22 +65,29 @@ bool __timer_set(long cycles, bool start)
     return true;
 }
 
-bool __timer_register(void)
+static void stop_timer(void)
 {
-    bool retval = true;
+    IO_INTC_EINT0 &= ~(1<<IRQ_TIMER0);
+
+    IO_INTC_IRQ0 |= 1<<IRQ_TIMER0;
+    
+    IO_TIMER0_TMMD = CONFIG_TIMER0_TMMD_STOP;
+}
 
+bool __timer_register(void)
+{
     int oldstatus = set_interrupt_status(IRQ_FIQ_DISABLED, IRQ_FIQ_STATUS);
 
     stop_timer();
 
     /* Turn Timer0 to Free Run mode */
-	IO_TIMER0_TMMD = CONFIG_TIMER0_TMMD_FREE_RUN;
+    IO_TIMER0_TMMD = CONFIG_TIMER0_TMMD_FREE_RUN;
 
-	IO_INTC_EINT0 |= 1<<IRQ_TIMER0;
+    IO_INTC_EINT0 |= 1<<IRQ_TIMER0;
 
     set_interrupt_status(oldstatus, IRQ_FIQ_STATUS);
 
-    return retval;
+    return true;
 }
 
 void __timer_unregister(void)
-- 
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