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