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 #include <uthread.h>
21
22 #ifndef CFG_WD_PERIOD
23 # define CFG_WD_PERIOD (10 * 1000 * 1000) /* 10 seconds default */
24 #endif
25
26 DECLARE_GLOBAL_DATA_PTR;
27
28 #ifdef CFG_SYS_TIMER_RATE
29 /* Returns tick rate in ticks per second */
get_tbclk(void)30 ulong notrace get_tbclk(void)
31 {
32 return CFG_SYS_TIMER_RATE;
33 }
34 #endif
35
36 #ifdef CFG_SYS_TIMER_COUNTER
timer_read_counter(void)37 unsigned long notrace timer_read_counter(void)
38 {
39 #ifdef CONFIG_SYS_TIMER_COUNTS_DOWN
40 return ~readl(CFG_SYS_TIMER_COUNTER);
41 #else
42 return readl(CFG_SYS_TIMER_COUNTER);
43 #endif
44 }
45
timer_get_boot_us(void)46 ulong timer_get_boot_us(void)
47 {
48 ulong count = timer_read_counter();
49
50 #ifdef CFG_SYS_TIMER_RATE
51 const ulong timer_rate = CFG_SYS_TIMER_RATE;
52
53 if (timer_rate == 1000000)
54 return count;
55 else if (timer_rate > 1000000)
56 return lldiv(count, timer_rate / 1000000);
57 else
58 return (unsigned long long)count * 1000000 / timer_rate;
59 #else
60 /* Assume the counter is in microseconds */
61 return count;
62 #endif
63 }
64
65 #else
66 extern unsigned long timer_read_counter(void);
67 #endif
68
69 #if CONFIG_IS_ENABLED(TIMER)
get_tbclk(void)70 ulong notrace get_tbclk(void)
71 {
72 if (!gd->timer) {
73 int ret;
74
75 if (IS_ENABLED(CONFIG_TIMER_EARLY))
76 return timer_early_get_rate();
77
78 ret = dm_timer_init();
79 if (ret)
80 return ret;
81 }
82
83 return timer_get_rate(gd->timer);
84 }
85
get_ticks(void)86 uint64_t notrace get_ticks(void)
87 {
88 u64 count;
89 int ret;
90
91 if (!gd->timer) {
92 int ret;
93
94 if (IS_ENABLED(CONFIG_TIMER_EARLY))
95 return timer_early_get_count();
96
97 ret = dm_timer_init();
98 if (ret)
99 panic("Could not initialize timer (err %d)\n", ret);
100 }
101
102 ret = timer_get_count(gd->timer, &count);
103 if (ret) {
104 if (xpl_phase() > PHASE_TPL)
105 panic("Could not read count from timer (err %d)\n",
106 ret);
107 else
108 panic("no timer (err %d)\n", ret);
109 }
110
111 return count;
112 }
113
114 #else /* !CONFIG_TIMER */
115
get_ticks(void)116 uint64_t __weak notrace get_ticks(void)
117 {
118 unsigned long now = timer_read_counter();
119
120 /* increment tbu if tbl has rolled over */
121 if (now < gd->timebase_l)
122 gd->timebase_h++;
123 gd->timebase_l = now;
124 return ((uint64_t)gd->timebase_h << 32) | gd->timebase_l;
125 }
126
127 #endif /* CONFIG_TIMER */
128
129 /* Returns time in milliseconds */
tick_to_time(uint64_t tick)130 static uint64_t notrace tick_to_time(uint64_t tick)
131 {
132 ulong div = get_tbclk();
133
134 tick *= CONFIG_SYS_HZ;
135 do_div(tick, div);
136 return tick;
137 }
138
timer_init(void)139 int __weak timer_init(void)
140 {
141 return 0;
142 }
143
144 /* Returns time in milliseconds */
get_timer(ulong base)145 ulong __weak get_timer(ulong base)
146 {
147 return tick_to_time(get_ticks()) - base;
148 }
149
tick_to_time_us(uint64_t tick)150 static uint64_t notrace tick_to_time_us(uint64_t tick)
151 {
152 ulong div = get_tbclk() / 1000;
153
154 tick *= CONFIG_SYS_HZ;
155 do_div(tick, div);
156 return tick;
157 }
158
get_timer_us(uint64_t base)159 uint64_t __weak get_timer_us(uint64_t base)
160 {
161 return tick_to_time_us(get_ticks()) - base;
162 }
163
get_timer_us_long(unsigned long base)164 unsigned long __weak get_timer_us_long(unsigned long base)
165 {
166 return timer_get_us() - base;
167 }
168
timer_get_us(void)169 unsigned long __weak notrace timer_get_us(void)
170 {
171 return tick_to_time(get_ticks() * 1000);
172 }
173
usec_to_tick(unsigned long usec)174 uint64_t usec_to_tick(unsigned long usec)
175 {
176 uint64_t tick = usec;
177 tick *= get_tbclk();
178 do_div(tick, 1000000);
179 return tick;
180 }
181
__udelay(unsigned long usec)182 void __weak __udelay(unsigned long usec)
183 {
184 uint64_t tmp;
185
186 tmp = get_ticks() + usec_to_tick(usec); /* get current timestamp */
187
188 while (get_ticks() < tmp+1) /* loop till event */
189 /*NOP*/;
190 }
191
192 /* ------------------------------------------------------------------------- */
193
udelay(unsigned long usec)194 void udelay(unsigned long usec)
195 {
196 ulong kv;
197
198 do {
199 schedule();
200 kv = usec > CFG_WD_PERIOD ? CFG_WD_PERIOD : usec;
201 if (CONFIG_IS_ENABLED(UTHREAD)) {
202 ulong t0 = timer_get_us();
203 while (timer_get_us() - t0 < kv)
204 uthread_schedule();
205 } else {
206 __udelay(kv);
207 }
208 usec -= kv;
209 } while(usec);
210 }
211