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Ingenic Jz4740: should fix timer (thanks to Rafaël Carré)

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@21184 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Maurus Cuelenaere 2009-06-03 22:52:54 +00:00
parent 63bc7c9009
commit 398e1059c5
2 changed files with 27 additions and 27 deletions
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50
firmware/target/mips/ingenic_jz47xx/timer-jz4740.c
View file

@ -28,69 +28,67 @@
void TCU1(void) void TCU1(void)
{ {
__tcu_clear_full_match_flag(1); __tcu_clear_full_match_flag(1);
if (pfn_timer != NULL) if (pfn_timer != NULL)
pfn_timer(); pfn_timer();
} }
/* TODO: figure out what cycles means */
bool __timer_set(long cycles, bool start) bool __timer_set(long cycles, bool start)
{ {
unsigned int latch, old_irq; unsigned int divider = cycles, prescaler_bit = 0, prescaler = 1, old_irq;
if(cycles < 1) if(cycles < 1)
return false; return false;
if (start && pfn_unregister != NULL) if(start && pfn_unregister != NULL)
{ {
pfn_unregister(); pfn_unregister();
pfn_unregister = NULL; pfn_unregister = NULL;
} }
old_irq = disable_irq_save(); old_irq = disable_irq_save();
__tcu_stop_counter(1); __tcu_stop_counter(1);
__tcu_disable_pwm_output(1); __tcu_disable_pwm_output(1);
__tcu_mask_half_match_irq(1); __tcu_mask_half_match_irq(1);
__tcu_unmask_full_match_irq(1); __tcu_unmask_full_match_irq(1);
/* EXTAL clock = 12Mhz */ /* EXTAL clock = CFG_EXTAL (12Mhz in most targets) */
__tcu_select_extalclk(1); __tcu_select_extalclk(1);
/* 12Mhz / 4 = 3Mhz */
__tcu_select_clk_div4(1);
latch = cycles;
/* 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);
REG_TCU_TCNT(1) = 0; REG_TCU_TCNT(1) = 0;
REG_TCU_TDFR(1) = latch; REG_TCU_TDHR(1) = 0;
REG_TCU_TDHR(1) = latch; REG_TCU_TDFR(1) = divider;
__tcu_clear_full_match_flag(1); __tcu_clear_full_match_flag(1);
system_enable_irq(IRQ_TCU1); system_enable_irq(IRQ_TCU1);
restore_irq(old_irq); restore_irq(old_irq);
return true; return true;
} }
bool __timer_register(void) bool __timer_register(void)
{ {
unsigned int old_irq = disable_irq_save();
__tcu_start_counter(1); __tcu_start_counter(1);
restore_irq(old_irq);
return true; return true;
} }
void __timer_unregister(void) void __timer_unregister(void)
{ {
unsigned int old_irq = disable_irq_save(); unsigned int old_irq = disable_irq_save();
__tcu_stop_counter(1); __tcu_stop_counter(1);
restore_irq(old_irq); restore_irq(old_irq);
} }

4
firmware/target/mips/ingenic_jz47xx/timer-target.h
View file

@ -22,7 +22,9 @@
#ifndef __TIMER_H_ #ifndef __TIMER_H_
#define __TIMER_H_ #define __TIMER_H_
#define TIMER_FREQ (27000000) #include "config.h"
#define TIMER_FREQ (CFG_EXTAL) /* For full precision! */
bool __timer_set(long cycles, bool set); bool __timer_set(long cycles, bool set);
bool __timer_register(void); bool __timer_register(void);