1 /* SPDX-License-Identifier: GPL-2.0-only */
3 #include <device/mmio.h>
8 #include <soc/addressmap.h>
11 static struct mtk_gpt_regs
*const mtk_gpt
= (void *)GPT_BASE
;
13 __weak
void timer_prepare(void) { /* do nothing */ }
15 static uint64_t timer_raw_value(void)
18 * According to "General-Purpose Timer (GPT).pdf", The read operation of
19 * gpt6_cnt_l will make gpt6_cnt_h fixed until the next read operation
20 * of gpt6_cnt_l. Therefore, we must read gpt6_cnt_l before gpt6_cnt_h.
22 uint32_t low
= read32(&mtk_gpt
->gpt6_cnt_l
);
23 uint32_t high
= read32(&mtk_gpt
->gpt6_cnt_h
);
25 return low
| (uint64_t)high
<< 32;
28 void timer_monotonic_get(struct mono_time
*mt
)
30 mono_time_set_usecs(mt
, timer_raw_value() / TIMER_MHZ
);
37 /* Disable timer and clear the counter */
38 clrbits32(&mtk_gpt
->gpt6_con
, GPT6_CON_EN
);
39 setbits32(&mtk_gpt
->gpt6_con
, GPT6_CON_CLR
);
41 /* Set clock source to system clock and set clock divider to 1 */
42 SET32_BITFIELDS(&GPT6_CLOCK_REG(mtk_gpt
),
43 GPT6_CLK_CLK6
, GPT6_CLK_CLK6_SYS
,
44 GPT6_CLK_CLKDIV6
, GPT6_CLK_CLKDIV_DIV1
);
45 /* Set operation mode to FREERUN mode and enable timer */
46 SET32_BITFIELDS(&mtk_gpt
->gpt6_con
,
47 GPT6_CON_MODE6
, GPT6_MODE_FREERUN
,
48 GPT6_CON_EN6
, GPT6_CON_EN
);