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 <watchdog.h> 10 #include <div64.h> 11 #include <asm/io.h> 12 13 #if CONFIG_SYS_HZ != 1000 14 #warning "CONFIG_SYS_HZ must be 1000 and should not be defined by platforms" 15 #endif 16 17 #ifndef CONFIG_WD_PERIOD 18 # define CONFIG_WD_PERIOD (10 * 1000 * 1000) /* 10 seconds default*/ 19 #endif 20 21 DECLARE_GLOBAL_DATA_PTR; 22 23 #ifdef CONFIG_SYS_TIMER_RATE 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 unsigned long long __weak notrace get_ticks(void) 44 { 45 unsigned long now = timer_read_counter(); 46 47 /* increment tbu if tbl has rolled over */ 48 if (now < gd->timebase_l) 49 gd->timebase_h++; 50 gd->timebase_l = now; 51 return ((unsigned long long)gd->timebase_h << 32) | gd->timebase_l; 52 } 53 54 static unsigned long long notrace tick_to_time(unsigned long long tick) 55 { 56 unsigned int div = get_tbclk(); 57 58 tick *= CONFIG_SYS_HZ; 59 do_div(tick, div); 60 return tick; 61 } 62 63 ulong __weak get_timer(ulong base) 64 { 65 return tick_to_time(get_ticks()) - base; 66 } 67 68 unsigned long __weak notrace timer_get_us(void) 69 { 70 return tick_to_time(get_ticks() * 1000); 71 } 72 static unsigned long long usec_to_tick(unsigned long usec) 73 { 74 unsigned long long tick = usec * get_tbclk(); 75 usec *= get_tbclk(); 76 do_div(tick, 1000000); 77 return tick; 78 } 79 80 void __weak __udelay(unsigned long usec) 81 { 82 unsigned long long tmp; 83 ulong tmo; 84 85 tmo = usec_to_tick(usec); 86 tmp = get_ticks() + tmo; /* get current timestamp */ 87 88 while (get_ticks() < tmp) /* loop till event */ 89 /*NOP*/; 90 } 91 92 /* ------------------------------------------------------------------------- */ 93 94 void udelay(unsigned long usec) 95 { 96 ulong kv; 97 98 do { 99 WATCHDOG_RESET(); 100 kv = usec > CONFIG_WD_PERIOD ? CONFIG_WD_PERIOD : usec; 101 __udelay (kv); 102 usec -= kv; 103 } while(usec); 104 } 105 106 void mdelay(unsigned long msec) 107 { 108 while (msec--) 109 udelay(1000); 110 } 111