1 /* 2 * (C) Copyright 2009 3 * Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com> 4 * 5 * (C) Copyright 2007-2012 6 * Nobobuhiro Iwamatsu <iwamatsu@nigauri.org> 7 * 8 * (C) Copyright 2003 9 * Wolfgang Denk, DENX Software Engineering, wd@denx.de. 10 * 11 * SPDX-License-Identifier: GPL-2.0+ 12 */ 13 14 #include <common.h> 15 #include <div64.h> 16 #include <asm/processor.h> 17 #include <asm/io.h> 18 #include <sh_tmu.h> 19 20 static struct tmu_regs *tmu = (struct tmu_regs *)TMU_BASE; 21 22 static u16 bit; 23 static unsigned long last_tcnt; 24 static unsigned long long overflow_ticks; 25 26 unsigned long get_tbclk(void) 27 { 28 return get_tmu0_clk_rate() >> ((bit + 1) * 2); 29 } 30 31 static inline unsigned long long tick_to_time(unsigned long long tick) 32 { 33 tick *= CONFIG_SYS_HZ; 34 do_div(tick, get_tbclk()); 35 36 return tick; 37 } 38 39 static inline unsigned long long usec_to_tick(unsigned long long usec) 40 { 41 usec *= get_tbclk(); 42 do_div(usec, 1000000); 43 44 return usec; 45 } 46 47 static void tmu_timer_start(unsigned int timer) 48 { 49 if (timer > 2) 50 return; 51 writeb(readb(&tmu->tstr) | (1 << timer), &tmu->tstr); 52 } 53 54 static void tmu_timer_stop(unsigned int timer) 55 { 56 if (timer > 2) 57 return; 58 writeb(readb(&tmu->tstr) & ~(1 << timer), &tmu->tstr); 59 } 60 61 int timer_init(void) 62 { 63 bit = (ffs(CONFIG_SYS_TMU_CLK_DIV) >> 1) - 1; 64 writew(readw(&tmu->tcr0) | bit, &tmu->tcr0); 65 66 tmu_timer_stop(0); 67 tmu_timer_start(0); 68 69 last_tcnt = 0; 70 overflow_ticks = 0; 71 72 return 0; 73 } 74 75 unsigned long long get_ticks(void) 76 { 77 unsigned long tcnt = 0 - readl(&tmu->tcnt0); 78 79 if (last_tcnt > tcnt) /* overflow */ 80 overflow_ticks++; 81 last_tcnt = tcnt; 82 83 return (overflow_ticks << 32) | tcnt; 84 } 85 86 void __udelay(unsigned long usec) 87 { 88 unsigned long long tmp; 89 ulong tmo; 90 91 tmo = usec_to_tick(usec); 92 tmp = get_ticks() + tmo; /* get current timestamp */ 93 94 while (get_ticks() < tmp) /* loop till event */ 95 /*NOP*/; 96 } 97 98 unsigned long get_timer(unsigned long base) 99 { 100 /* return msec */ 101 return tick_to_time(get_ticks()) - base; 102 } 103 104 void set_timer(unsigned long t) 105 { 106 writel((0 - t), &tmu->tcnt0); 107 } 108 109 void reset_timer(void) 110 { 111 tmu_timer_stop(0); 112 set_timer(0); 113 tmu_timer_start(0); 114 } 115