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