1 /* 2 * (C) Copyright 2000-2009 3 * Wolfgang Denk, DENX Software Engineering, wd@denx.de. 4 * 5 * SPDX-License-Identifier: GPL-2.0+ 6 */ 7 8 #include <common.h> 9 #include <dm.h> 10 #include <errno.h> 11 #include <timer.h> 12 #include <watchdog.h> 13 #include <div64.h> 14 #include <asm/io.h> 15 16 #ifndef CONFIG_WD_PERIOD 17 # define CONFIG_WD_PERIOD (10 * 1000 * 1000) /* 10 seconds default */ 18 #endif 19 20 DECLARE_GLOBAL_DATA_PTR; 21 22 #ifdef CONFIG_SYS_TIMER_RATE 23 /* Returns tick rate in ticks per second */ 24 ulong notrace get_tbclk(void) 25 { 26 return CONFIG_SYS_TIMER_RATE; 27 } 28 #endif 29 30 #ifdef CONFIG_SYS_TIMER_COUNTER 31 unsigned long notrace timer_read_counter(void) 32 { 33 #ifdef CONFIG_SYS_TIMER_COUNTS_DOWN 34 return ~readl(CONFIG_SYS_TIMER_COUNTER); 35 #else 36 return readl(CONFIG_SYS_TIMER_COUNTER); 37 #endif 38 } 39 #else 40 extern unsigned long __weak timer_read_counter(void); 41 #endif 42 43 #ifdef CONFIG_TIMER 44 static int notrace dm_timer_init(void) 45 { 46 struct udevice *dev; 47 int ret; 48 49 if (!gd->timer) { 50 ret = uclass_first_device(UCLASS_TIMER, &dev); 51 if (ret) 52 return ret; 53 if (!dev) 54 return -ENODEV; 55 gd->timer = dev; 56 } 57 58 return 0; 59 } 60 61 ulong notrace get_tbclk(void) 62 { 63 int ret; 64 65 ret = dm_timer_init(); 66 if (ret) 67 return ret; 68 69 return timer_get_rate(gd->timer); 70 } 71 72 unsigned long notrace timer_read_counter(void) 73 { 74 unsigned long count; 75 int ret; 76 77 ret = dm_timer_init(); 78 if (ret) 79 return ret; 80 81 ret = timer_get_count(gd->timer, &count); 82 if (ret) 83 return ret; 84 85 return count; 86 } 87 #endif /* CONFIG_TIMER */ 88 89 uint64_t __weak notrace get_ticks(void) 90 { 91 unsigned long now = timer_read_counter(); 92 93 /* increment tbu if tbl has rolled over */ 94 if (now < gd->timebase_l) 95 gd->timebase_h++; 96 gd->timebase_l = now; 97 return ((uint64_t)gd->timebase_h << 32) | gd->timebase_l; 98 } 99 100 /* Returns time in milliseconds */ 101 static uint64_t notrace tick_to_time(uint64_t tick) 102 { 103 ulong div = get_tbclk(); 104 105 tick *= CONFIG_SYS_HZ; 106 do_div(tick, div); 107 return tick; 108 } 109 110 int __weak timer_init(void) 111 { 112 return 0; 113 } 114 115 /* Returns time in milliseconds */ 116 ulong __weak get_timer(ulong base) 117 { 118 return tick_to_time(get_ticks()) - base; 119 } 120 121 unsigned long __weak notrace timer_get_us(void) 122 { 123 return tick_to_time(get_ticks() * 1000); 124 } 125 126 static uint64_t usec_to_tick(unsigned long usec) 127 { 128 uint64_t tick = usec; 129 tick *= get_tbclk(); 130 do_div(tick, 1000000); 131 return tick; 132 } 133 134 void __weak __udelay(unsigned long usec) 135 { 136 uint64_t tmp; 137 138 tmp = get_ticks() + usec_to_tick(usec); /* get current timestamp */ 139 140 while (get_ticks() < tmp+1) /* loop till event */ 141 /*NOP*/; 142 } 143 144 /* ------------------------------------------------------------------------- */ 145 146 void udelay(unsigned long usec) 147 { 148 ulong kv; 149 150 do { 151 WATCHDOG_RESET(); 152 kv = usec > CONFIG_WD_PERIOD ? CONFIG_WD_PERIOD : usec; 153 __udelay (kv); 154 usec -= kv; 155 } while(usec); 156 } 157 158 void mdelay(unsigned long msec) 159 { 160 while (msec--) 161 udelay(1000); 162 } 163