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Jz4740 timer driver: only init timer in timer_set() when start is true

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@22075 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Maurus Cuelenaere 2009-07-27 19:01:40 +00:00
parent e38f3abac9
commit d0a132a7a4
1 changed files with 19 additions and 12 deletions
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21
firmware/target/mips/ingenic_jz47xx/timer-jz4740.c
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@ -46,9 +46,19 @@ bool timer_set(long cycles, bool start)
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(1);
if(start)
{
__tcu_disable_pwm_output(1);
__tcu_mask_half_match_irq(1);
@ -56,13 +66,6 @@ bool timer_set(long cycles, bool start)
/* EXTAL clock = CFG_EXTAL (12Mhz in most targets) */
__tcu_select_extalclk(1);
/* 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;
}
REG_TCU_TCSR(1) = (REG_TCU_TCSR(1) & ~TCU_TCSR_PRESCALE_MASK) | (prescaler_bit << TCU_TCSR_PRESCALE_BIT);
@ -72,7 +75,11 @@ bool timer_set(long cycles, bool start)
__tcu_clear_full_match_flag(1);
if(start)
{
system_enable_irq(IRQ_TCU1);
__tcu_start_counter(1);
}
restore_irq(old_irq);