1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * (C) Copyright 2000-2009
4 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
5 */
6
7#include <clock_legacy.h>
8#include <bootstage.h>
9#include <dm.h>
10#include <errno.h>
11#include <init.h>
12#include <spl.h>
13#include <time.h>
14#include <timer.h>
15#include <watchdog.h>
16#include <div64.h>
17#include <asm/global_data.h>
18#include <asm/io.h>
19#include <linux/delay.h>
20
21#ifndef CFG_WD_PERIOD
22# define CFG_WD_PERIOD	(10 * 1000 * 1000)	/* 10 seconds default */
23#endif
24
25DECLARE_GLOBAL_DATA_PTR;
26
27#ifdef CFG_SYS_TIMER_RATE
28/* Returns tick rate in ticks per second */
29ulong notrace get_tbclk(void)
30{
31	return CFG_SYS_TIMER_RATE;
32}
33#endif
34
35#ifdef CFG_SYS_TIMER_COUNTER
36unsigned long notrace timer_read_counter(void)
37{
38#ifdef CONFIG_SYS_TIMER_COUNTS_DOWN
39	return ~readl(CFG_SYS_TIMER_COUNTER);
40#else
41	return readl(CFG_SYS_TIMER_COUNTER);
42#endif
43}
44
45ulong timer_get_boot_us(void)
46{
47	ulong count = timer_read_counter();
48
49#ifdef CFG_SYS_TIMER_RATE
50	const ulong timer_rate = CFG_SYS_TIMER_RATE;
51
52	if (timer_rate == 1000000)
53		return count;
54	else if (timer_rate > 1000000)
55		return lldiv(count, timer_rate / 1000000);
56	else
57		return (unsigned long long)count * 1000000 / timer_rate;
58#else
59	/* Assume the counter is in microseconds */
60	return count;
61#endif
62}
63
64#else
65extern unsigned long timer_read_counter(void);
66#endif
67
68#if CONFIG_IS_ENABLED(TIMER)
69ulong notrace get_tbclk(void)
70{
71	if (!gd->timer) {
72		int ret;
73
74		if (IS_ENABLED(CONFIG_TIMER_EARLY))
75			return timer_early_get_rate();
76
77		ret = dm_timer_init();
78		if (ret)
79			return ret;
80	}
81
82	return timer_get_rate(gd->timer);
83}
84
85uint64_t notrace get_ticks(void)
86{
87	u64 count;
88	int ret;
89
90	if (!gd->timer) {
91		int ret;
92
93		if (IS_ENABLED(CONFIG_TIMER_EARLY))
94			return timer_early_get_count();
95
96		ret = dm_timer_init();
97		if (ret)
98			panic("Could not initialize timer (err %d)\n", ret);
99	}
100
101	ret = timer_get_count(gd->timer, &count);
102	if (ret) {
103		if (spl_phase() > PHASE_TPL)
104			panic("Could not read count from timer (err %d)\n",
105			      ret);
106		else
107			panic("no timer (err %d)\n", ret);
108	}
109
110	return count;
111}
112
113#else /* !CONFIG_TIMER */
114
115uint64_t __weak notrace get_ticks(void)
116{
117	unsigned long now = timer_read_counter();
118
119	/* increment tbu if tbl has rolled over */
120	if (now < gd->timebase_l)
121		gd->timebase_h++;
122	gd->timebase_l = now;
123	return ((uint64_t)gd->timebase_h << 32) | gd->timebase_l;
124}
125
126#endif /* CONFIG_TIMER */
127
128/* Returns time in milliseconds */
129static uint64_t notrace tick_to_time(uint64_t tick)
130{
131	ulong div = get_tbclk();
132
133	tick *= CONFIG_SYS_HZ;
134	do_div(tick, div);
135	return tick;
136}
137
138int __weak timer_init(void)
139{
140	return 0;
141}
142
143/* Returns time in milliseconds */
144ulong __weak get_timer(ulong base)
145{
146	return tick_to_time(get_ticks()) - base;
147}
148
149static uint64_t notrace tick_to_time_us(uint64_t tick)
150{
151	ulong div = get_tbclk() / 1000;
152
153	tick *= CONFIG_SYS_HZ;
154	do_div(tick, div);
155	return tick;
156}
157
158uint64_t __weak get_timer_us(uint64_t base)
159{
160	return tick_to_time_us(get_ticks()) - base;
161}
162
163unsigned long __weak get_timer_us_long(unsigned long base)
164{
165	return timer_get_us() - base;
166}
167
168unsigned long __weak notrace timer_get_us(void)
169{
170	return tick_to_time(get_ticks() * 1000);
171}
172
173uint64_t usec_to_tick(unsigned long usec)
174{
175	uint64_t tick = usec;
176	tick *= get_tbclk();
177	do_div(tick, 1000000);
178	return tick;
179}
180
181void __weak __udelay(unsigned long usec)
182{
183	uint64_t tmp;
184
185	tmp = get_ticks() + usec_to_tick(usec);	/* get current timestamp */
186
187	while (get_ticks() < tmp+1)	/* loop till event */
188		 /*NOP*/;
189}
190
191/* ------------------------------------------------------------------------- */
192
193void udelay(unsigned long usec)
194{
195	ulong kv;
196
197	do {
198		schedule();
199		kv = usec > CFG_WD_PERIOD ? CFG_WD_PERIOD : usec;
200		__udelay(kv);
201		usec -= kv;
202	} while(usec);
203}
204