1 /*
2  * (C) Copyright 2015 Rockchip Electronics Co., Ltd
3  *
4  * SPDX-License-Identifier:     GPL-2.0+
5  */
6 
7 #include <asm/arch/timer.h>
8 #include <asm/io.h>
9 #include <common.h>
10 #include <linux/types.h>
11 
12 struct rk_timer * const timer_ptr = (void *)CONFIG_SYS_TIMER_BASE;
13 
14 static uint64_t rockchip_get_ticks(void)
15 {
16 	uint64_t timebase_h, timebase_l;
17 
18 	timebase_l = readl(&timer_ptr->timer_curr_value0);
19 	timebase_h = readl(&timer_ptr->timer_curr_value1);
20 
21 	return timebase_h << 32 | timebase_l;
22 }
23 
24 static uint64_t usec_to_tick(unsigned int usec)
25 {
26 	uint64_t tick = usec;
27 	tick *= CONFIG_SYS_TIMER_RATE / (1000 * 1000);
28 	return tick;
29 }
30 
31 void rockchip_udelay(unsigned int usec)
32 {
33 	uint64_t tmp;
34 
35 	/* get timestamp */
36 	tmp = rockchip_get_ticks() + usec_to_tick(usec);
37 
38 	/* loop till event */
39 	while (rockchip_get_ticks() < tmp+1)
40 		;
41 }
42 
43 void rockchip_timer_init(void)
44 {
45 	writel(0xffffffff, &timer_ptr->timer_load_count0);
46 	writel(0xffffffff, &timer_ptr->timer_load_count1);
47 	writel(1, &timer_ptr->timer_ctrl_reg);
48 }
49