mirror of
https://github.com/AsahiLinux/u-boot
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157 lines
3 KiB
C
157 lines
3 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 2007-2010
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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/clk.h>
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#include <asm/io.h>
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#define TMU_MAX_COUNTER (~0UL)
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static ulong timer_freq;
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static unsigned long last_tcnt;
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static unsigned long long overflow_ticks;
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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, timer_freq);
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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 *= timer_freq;
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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(TSTR) | (1 << timer), 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(TSTR) & ~(1 << timer), TSTR);
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}
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int timer_init (void)
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{
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/* Divide clock by CONFIG_SYS_TMU_CLK_DIV */
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u16 bit = 0;
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switch (CONFIG_SYS_TMU_CLK_DIV) {
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case 1024:
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bit = 4;
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break;
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case 256:
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bit = 3;
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break;
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case 64:
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bit = 2;
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break;
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case 16:
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bit = 1;
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break;
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case 4:
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default:
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break;
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}
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writew(readw(TCR0) | bit, TCR0);
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/* Calc clock rate */
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timer_freq = get_tmu0_clk_rate() >> ((bit + 1) * 2);
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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(TCNT0);
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unsigned long ticks;
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if (last_tcnt > tcnt) { /* overflow */
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overflow_ticks++;
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ticks = (0xffffffff - last_tcnt) + tcnt;
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} else {
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ticks = tcnt;
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}
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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), 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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unsigned long get_tbclk (void)
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{
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return timer_freq;
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}
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