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