1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * (C) Copyright 2012 Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@renesas.com> 4 * (C) Copyright 2012 Renesas Solutions Corp. 5 */ 6 7 #include <common.h> 8 #include <div64.h> 9 #include <init.h> 10 #include <time.h> 11 #include <asm/io.h> 12 #include <asm/arch-armv7/globaltimer.h> 13 #include <asm/arch/rmobile.h> 14 #include <linux/delay.h> 15 16 static struct globaltimer *global_timer = \ 17 (struct globaltimer *)GLOBAL_TIMER_BASE_ADDR; 18 19 #define CLK2MHZ(clk) (clk / 1000 / 1000) get_cpu_global_timer(void)20static u64 get_cpu_global_timer(void) 21 { 22 u32 low, high; 23 u64 timer; 24 25 u32 old = readl(&global_timer->cnt_h); 26 while (1) { 27 low = readl(&global_timer->cnt_l); 28 high = readl(&global_timer->cnt_h); 29 if (old == high) 30 break; 31 else 32 old = high; 33 } 34 35 timer = high; 36 return (u64)((timer << 32) | low); 37 } 38 get_time_us(void)39static u64 get_time_us(void) 40 { 41 u64 timer = get_cpu_global_timer(); 42 43 timer = ((timer << 2) + (CLK2MHZ(CONFIG_SYS_CPU_CLK) >> 1)); 44 do_div(timer, CLK2MHZ(CONFIG_SYS_CPU_CLK)); 45 return timer; 46 } 47 get_time_ms(void)48static ulong get_time_ms(void) 49 { 50 u64 us = get_time_us(); 51 52 do_div(us, 1000); 53 return us; 54 } 55 timer_init(void)56int timer_init(void) 57 { 58 writel(0x01, &global_timer->ctl); 59 return 0; 60 } 61 __udelay(unsigned long usec)62void __udelay(unsigned long usec) 63 { 64 u64 start, current; 65 u64 wait; 66 67 start = get_cpu_global_timer(); 68 wait = (u64)((usec * CLK2MHZ(CONFIG_SYS_CPU_CLK)) >> 2); 69 do { 70 current = get_cpu_global_timer(); 71 } while ((current - start) < wait); 72 } 73 get_timer(ulong base)74ulong get_timer(ulong base) 75 { 76 return get_time_ms() - base; 77 } 78 get_ticks(void)79unsigned long long get_ticks(void) 80 { 81 return get_cpu_global_timer(); 82 } 83 get_tbclk(void)84ulong get_tbclk(void) 85 { 86 return (ulong)(CONFIG_SYS_CPU_CLK >> 2); 87 } 88