// SPDX-License-Identifier: GPL-2.0+ /* * Copyright (C) 2012-2015 Masahiro Yamada <yamada.masahiro@socionext.com> */ #include <config.h> #include <init.h> #include <linux/io.h> #include "arm-mpcore.h" #define PERIPHCLK (50 * 1000 * 1000) /* 50 MHz */ #define PRESCALER ((PERIPHCLK) / (CONFIG_SYS_TIMER_RATE) - 1) static void *get_global_timer_base(void) { void *val; asm("mrc p15, 4, %0, c15, c0, 0" : "=r" (val) : : "memory"); return val + GLOBAL_TIMER_OFFSET; } unsigned long timer_read_counter(void) { /* * ARM 64bit Global Timer is too much for our purpose. * We use only lower 32 bit of the timer counter. */ return readl(get_global_timer_base() + GTIMER_CNT_L); } int timer_init(void) { /* enable timer */ writel(PRESCALER << 8 | 1, get_global_timer_base() + GTIMER_CTRL); return 0; }