| /* SPDX-License-Identifier: GPL-2.0-only */ |
| |
| #include <timer.h> |
| #include <delay.h> |
| #include <device/mmio.h> |
| |
| #include "dmtimer.h" |
| #include "clock.h" |
| |
| struct am335x_dmtimer *dmtimer_2 = (struct am335x_dmtimer *)DMTIMER_2; |
| |
| #define CLKSEL_M_OSC (0x01 << 0) |
| |
| static uint32_t timer_raw_value(void) |
| { |
| return read32(&dmtimer_2->tcrr); |
| } |
| |
| void timer_monotonic_get(struct mono_time *mt) |
| { |
| mono_time_set_usecs(mt, timer_raw_value() / M_OSC_MHZ); |
| } |
| |
| void init_timer(void) |
| { |
| write32(&am335x_cm_dpll->clksel_timer2_clk, CLKSEL_M_OSC); |
| |
| // Start the dmtimer in autoreload mode without any prescalers |
| // With M_OSC at 24MHz, this gives a few minutes before the timer overflows |
| write32(&dmtimer_2->tclr, TCLR_ST | TCLR_AR); |
| } |
