131 lines
2.8 KiB
C
131 lines
2.8 KiB
C
/*
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* (C) Copyright 2009
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* Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
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*
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* (C) Copyright 2007-2012
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* Nobobuhiro Iwamatsu <iwamatsu@nigauri.org>
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*
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* (C) Copyright 2003
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* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <common.h>
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#include <div64.h>
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#include <asm/processor.h>
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#include <asm/io.h>
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#include <sh_tmu.h>
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static struct tmu_regs *tmu = (struct tmu_regs *)TMU_BASE;
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static u16 bit;
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static unsigned long last_tcnt;
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static unsigned long long overflow_ticks;
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unsigned long get_tbclk(void)
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{
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return get_tmu0_clk_rate() >> ((bit + 1) * 2);
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}
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static inline unsigned long long tick_to_time(unsigned long long tick)
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{
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tick *= CONFIG_SYS_HZ;
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do_div(tick, get_tbclk());
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return tick;
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}
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static inline unsigned long long usec_to_tick(unsigned long long usec)
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{
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usec *= get_tbclk();
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do_div(usec, 1000000);
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return usec;
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}
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static void tmu_timer_start(unsigned int timer)
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{
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if (timer > 2)
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return;
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writeb(readb(&tmu->tstr) | (1 << timer), &tmu->tstr);
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}
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static void tmu_timer_stop(unsigned int timer)
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{
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if (timer > 2)
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return;
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writeb(readb(&tmu->tstr) & ~(1 << timer), &tmu->tstr);
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}
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int timer_init(void)
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{
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bit = (ffs(CONFIG_SYS_TMU_CLK_DIV) >> 1) - 1;
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writew(readw(&tmu->tcr0) | bit, &tmu->tcr0);
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tmu_timer_stop(0);
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tmu_timer_start(0);
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last_tcnt = 0;
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overflow_ticks = 0;
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return 0;
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}
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unsigned long long get_ticks(void)
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{
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unsigned long tcnt = 0 - readl(&tmu->tcnt0);
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if (last_tcnt > tcnt) /* overflow */
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overflow_ticks++;
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last_tcnt = tcnt;
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return (overflow_ticks << 32) | tcnt;
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}
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void __udelay(unsigned long usec)
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{
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unsigned long long tmp;
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ulong tmo;
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tmo = usec_to_tick(usec);
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tmp = get_ticks() + tmo; /* get current timestamp */
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while (get_ticks() < tmp) /* loop till event */
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/*NOP*/;
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}
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unsigned long get_timer(unsigned long base)
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{
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/* return msec */
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return tick_to_time(get_ticks()) - base;
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}
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void set_timer(unsigned long t)
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{
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writel((0 - t), &tmu->tcnt0);
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}
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void reset_timer(void)
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{
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tmu_timer_stop(0);
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set_timer(0);
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tmu_timer_start(0);
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}
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