diff options
Diffstat (limited to 'src/soc/mediatek/common/timer.c')
| -rw-r--r-- | src/soc/mediatek/common/timer.c | 27 |
1 files changed, 20 insertions, 7 deletions
diff --git a/src/soc/mediatek/common/timer.c b/src/soc/mediatek/common/timer.c index 0762c2b4b4..c8af2be113 100644 --- a/src/soc/mediatek/common/timer.c +++ b/src/soc/mediatek/common/timer.c @@ -25,21 +25,34 @@ static struct mtk_gpt_regs *const mtk_gpt = (void *)GPT_BASE; __weak void timer_prepare(void) { /* do nothing */ } +static uint64_t timer_raw_value(void) +{ + /* + * According to "General-Purpose Timer (GPT).pdf", The read operation of + * gpt6_cnt_l will make gpt6_cnt_h fixed until the next read operation + * of gpt6_cnt_l. Therefore, we must read gpt6_cnt_l before gpt6_cnt_h. + */ + uint32_t low = read32(&mtk_gpt->gpt6_cnt_l); + uint32_t high = read32(&mtk_gpt->gpt6_cnt_h); + + return low | (uint64_t)high << 32; +} + void timer_monotonic_get(struct mono_time *mt) { - mono_time_set_usecs(mt, read32(&mtk_gpt->gpt4_cnt) / GPT4_MHZ); + mono_time_set_usecs(mt, timer_raw_value() / GPT_MHZ); } void init_timer(void) { timer_prepare(); - /* Disable GPT4 and clear the counter */ - clrbits_le32(&mtk_gpt->gpt4_con, GPT_CON_EN); - setbits_le32(&mtk_gpt->gpt4_con, GPT_CON_CLR); + /* Disable timer and clear the counter */ + clrbits_le32(&mtk_gpt->gpt6_con, GPT_CON_EN); + setbits_le32(&mtk_gpt->gpt6_con, GPT_CON_CLR); /* Set clock source to system clock and set clock divider to 1 */ - write32(&mtk_gpt->gpt4_clk, GPT_SYS_CLK | GPT_CLK_DIV1); - /* Set operation mode to FREERUN mode and enable GTP4 */ - write32(&mtk_gpt->gpt4_con, GPT_CON_EN | GPT_MODE_FREERUN); + write32(&mtk_gpt->gpt6_clk, GPT_SYS_CLK | GPT_CLK_DIV1); + /* Set operation mode to FREERUN mode and enable timer */ + write32(&mtk_gpt->gpt6_con, GPT_CON_EN | GPT_MODE_FREERUN); } |