[people/ms/u-boot.git] / arch / arm / mach-rmobile / timer.c

/*
 * (C) Copyright 2012 Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@renesas.com>
 * (C) Copyright 2012 Renesas Solutions Corp.
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

#include <common.h>
#include <div64.h>
#include <asm/io.h>
#include <asm/arch-armv7/globaltimer.h>
#include <asm/arch/rmobile.h>

static struct globaltimer *global_timer = \
		(struct globaltimer *)GLOBAL_TIMER_BASE_ADDR;

#define CLK2MHZ(clk)	(clk / 1000 / 1000)
static u64 get_cpu_global_timer(void)
{
	u32 low, high;
	u64 timer;

	u32 old = readl(&global_timer->cnt_h);
	while (1) {
		low = readl(&global_timer->cnt_l);
		high = readl(&global_timer->cnt_h);
		if (old == high)
			break;
		else
			old = high;
	}

	timer = high;
	return (u64)((timer << 32) | low);
}

static u64 get_time_us(void)
{
	u64 timer = get_cpu_global_timer();

	timer = ((timer << 2) + (CLK2MHZ(CONFIG_SYS_CPU_CLK) >> 1));
	do_div(timer, CLK2MHZ(CONFIG_SYS_CPU_CLK));
	return timer;
}

static ulong get_time_ms(void)
{
	u64 us = get_time_us();

	do_div(us, 1000);
	return us;
}

int timer_init(void)
{
	writel(0x01, &global_timer->ctl);
	return 0;
}

void __udelay(unsigned long usec)
{
	u64 start, current;
	u64 wait;

	start = get_cpu_global_timer();
	wait = (u64)((usec * CLK2MHZ(CONFIG_SYS_CPU_CLK)) >> 2);
	do {
		current = get_cpu_global_timer();
	} while ((current - start) < wait);
}

ulong get_timer(ulong base)
{
	return get_time_ms() - base;
}

unsigned long long get_ticks(void)
{
	return get_cpu_global_timer();
}

ulong get_tbclk(void)
{
	return (ulong)(CONFIG_SYS_CPU_CLK >> 2);
}
Commit	Line	Data
4fb44e22 NI	1	/*
	2	* (C) Copyright 2012 Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@renesas.com>
	3	* (C) Copyright 2012 Renesas Solutions Corp.
	4	*
1a459660	5	* SPDX-License-Identifier: GPL-2.0+
4fb44e22 NI	6	*/
	7
	8	#include <common.h>
7579751c	9	#include <div64.h>
4fb44e22 NI	10	#include <asm/io.h>
	11	#include <asm/arch-armv7/globaltimer.h>
	12	#include <asm/arch/rmobile.h>
	13
	14	static struct globaltimer *global_timer = \
	15	(struct globaltimer *)GLOBAL_TIMER_BASE_ADDR;
	16
	17	#define CLK2MHZ(clk) (clk / 1000 / 1000)
	18	static u64 get_cpu_global_timer(void)
	19	{
	20	u32 low, high;
	21	u64 timer;
	22
	23	u32 old = readl(&global_timer->cnt_h);
	24	while (1) {
	25	low = readl(&global_timer->cnt_l);
	26	high = readl(&global_timer->cnt_h);
	27	if (old == high)
	28	break;
	29	else
	30	old = high;
	31	}
	32
	33	timer = high;
	34	return (u64)((timer << 32) \| low);
	35	}
	36
	37	static u64 get_time_us(void)
	38	{
	39	u64 timer = get_cpu_global_timer();
	40
	41	timer = ((timer << 2) + (CLK2MHZ(CONFIG_SYS_CPU_CLK) >> 1));
7579751c	42	do_div(timer, CLK2MHZ(CONFIG_SYS_CPU_CLK));
4fb44e22 NI	43	return timer;
	44	}
	45
	46	static ulong get_time_ms(void)
	47	{
7579751c NI	48	u64 us = get_time_us();
	49
	50	do_div(us, 1000);
	51	return us;
4fb44e22 NI	52	}
	53
	54	int timer_init(void)
	55	{
	56	writel(0x01, &global_timer->ctl);
	57	return 0;
	58	}
	59
	60	void __udelay(unsigned long usec)
	61	{
	62	u64 start, current;
	63	u64 wait;
	64
	65	start = get_cpu_global_timer();
	66	wait = (u64)((usec * CLK2MHZ(CONFIG_SYS_CPU_CLK)) >> 2);
	67	do {
	68	current = get_cpu_global_timer();
	69	} while ((current - start) < wait);
	70	}
	71
	72	ulong get_timer(ulong base)
	73	{
	74	return get_time_ms() - base;
	75	}
	76
	77	unsigned long long get_ticks(void)
	78	{
	79	return get_cpu_global_timer();
	80	}
	81
	82	ulong get_tbclk(void)
	83	{
	84	return (ulong)(CONFIG_SYS_CPU_CLK >> 2);
	85	}