diff options
Diffstat (limited to 'firmware/target/mips/ingenic_jz47xx/system-jz4760.c')
-rw-r--r-- | firmware/target/mips/ingenic_jz47xx/system-jz4760.c | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/firmware/target/mips/ingenic_jz47xx/system-jz4760.c b/firmware/target/mips/ingenic_jz47xx/system-jz4760.c index eb20985b97..899b346b54 100644 --- a/firmware/target/mips/ingenic_jz47xx/system-jz4760.c +++ b/firmware/target/mips/ingenic_jz47xx/system-jz4760.c @@ -338,11 +338,11 @@ void tlb_refill_handler(void) } #ifdef USE_HW_UDELAY -/* This enables the HW timer, set to EXT_XTAL / 16 (so @ 12MHz, 1 us = 750 ticks) */ +/* This enables the HW timer, set to EXT_XTAL / 4 (so @ 12/4 = 3MHz, 1 us = 3 ticks) */ static void init_delaytimer(void) { __tcu_disable_ost(); - REG_OST_OSTCSR = OSTCSR_EXT_EN | OSTCSR_PRESCALE16 | OSTCSR_CNT_MD; + REG_OST_OSTCSR = OSTCSR_EXT_EN | OSTCSR_PRESCALE4 | OSTCSR_CNT_MD; REG_OST_OSTCNT = 0; REG_OST_OSTDR = 0; __tcu_enable_ost(); @@ -353,10 +353,12 @@ void udelay(unsigned int usec) if (!__tcu_ost_enabled()) init_delaytimer(); + unsigned int now = REG_OST_OSTCNT; + /* Figure out how many ticks we need */ - usec = (CFG_EXTAL / 16 / 1000) * (usec + 1); + usec = (CFG_EXTAL / (4 * 1000 * 1000)) * (usec + 1); - while (usec < REG_OST_OSTCNT) { } + while (REG_OST_OSTCNT - now < usec) { } } #else void udelay(unsigned int usec) |