| /* SPDX-License-Identifier: GPL-2.0-only */ |
| /* This file is part of the coreboot project. */ |
| |
| #include <device/mmio.h> |
| #include <timer.h> |
| #include <delay.h> |
| #include <thread.h> |
| |
| #include <soc/addressmap.h> |
| #include <soc/timer.h> |
| |
| 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, timer_raw_value() / GPT_MHZ); |
| } |
| |
| void init_timer(void) |
| { |
| timer_prepare(); |
| |
| /* Disable timer and clear the counter */ |
| clrbits32(&mtk_gpt->gpt6_con, GPT_CON_EN); |
| setbits32(&mtk_gpt->gpt6_con, GPT_CON_CLR); |
| |
| /* Set clock source to system clock and set clock divider to 1 */ |
| 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); |
| } |