// SPDX-License-Identifier: GPL-2.0-only /* * Copyright (C) 2012 Antony Pavlov <antonynpavlov@gmail.com> */ /** * @file * @brief Clocksource based on JZ475x OS timer */ #include <init.h> #include <clock.h> #include <io.h> #include <mach/jz4750d_regs.h> #define JZ_TIMER_CLOCK 24000000 static uint64_t jz4750_cs_read(void) { return (uint64_t)__raw_readl((void *)TCU_OSTCNT); } static struct clocksource jz4750_cs = { .read = jz4750_cs_read, .mask = CLOCKSOURCE_MASK(32), }; static int clocksource_init(void) { clocks_calc_mult_shift(&jz4750_cs.mult, &jz4750_cs.shift, JZ_TIMER_CLOCK, NSEC_PER_SEC, 10); init_clock(&jz4750_cs); __raw_writel(TCU_OSTCSR_PRESCALE1 | TCU_OSTCSR_EXT_EN, (void *)TCU_OSTCSR); __raw_writel(0, (void *)TCU_OSTCNT); __raw_writel(0xffffffff, (void *)TCU_OSTDR); /* enable timer clock */ __raw_writel(TCU_TSCR_OSTSC, (void *)TCU_TSCR); /* start counting up */ __raw_writel(TCU_TESR_OSTST, (void *)TCU_TESR); return 0; } core_initcall(clocksource_init);