1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * (C) Copyright 2009 4 * Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com> 5 * 6 * (C) Copyright 2007-2012 7 * Nobobuhiro Iwamatsu <iwamatsu@nigauri.org> 8 * 9 * (C) Copyright 2003 10 * Wolfgang Denk, DENX Software Engineering, wd@denx.de. 11 */ 12 13 #include <common.h> 14 #include <asm/processor.h> 15 #include <asm/io.h> 16 #include <sh_tmu.h> 17 18 #define TCR_TPSC 0x07 19 20 static struct tmu_regs *tmu = (struct tmu_regs *)TMU_BASE; 21 22 unsigned long get_tbclk(void) 23 { 24 u16 tmu_bit = (ffs(CONFIG_SYS_TMU_CLK_DIV) >> 1) - 1; 25 return get_tmu0_clk_rate() >> ((tmu_bit + 1) * 2); 26 } 27 28 unsigned long timer_read_counter(void) 29 { 30 return ~readl(&tmu->tcnt0); 31 } 32 33 static void tmu_timer_start(unsigned int timer) 34 { 35 if (timer > 2) 36 return; 37 writeb(readb(&tmu->tstr) | (1 << timer), &tmu->tstr); 38 } 39 40 static void tmu_timer_stop(unsigned int timer) 41 { 42 if (timer > 2) 43 return; 44 writeb(readb(&tmu->tstr) & ~(1 << timer), &tmu->tstr); 45 } 46 47 int timer_init(void) 48 { 49 u16 tmu_bit = (ffs(CONFIG_SYS_TMU_CLK_DIV) >> 1) - 1; 50 writew((readw(&tmu->tcr0) & ~TCR_TPSC) | tmu_bit, &tmu->tcr0); 51 52 tmu_timer_stop(0); 53 tmu_timer_start(0); 54 55 return 0; 56 } 57 58