mirror of
https://github.com/AsahiLinux/u-boot
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143 lines
3.6 KiB
C
143 lines
3.6 KiB
C
/*
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* (C) Copyright 2003
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* Texas Instruments <www.ti.com>
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*
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* (C) Copyright 2002
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* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
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* Marius Groeger <mgroeger@sysgo.de>
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*
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* (C) Copyright 2002
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* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
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* Alex Zuepke <azu@sysgo.de>
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*
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* (C) Copyright 2002-2004
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* Gary Jennejohn, DENX Software Engineering, <garyj@denx.de>
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*
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* (C) Copyright 2004
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* Philippe Robin, ARM Ltd. <philippe.robin@arm.com>
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*
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* Copyright (C) 2007 Sergey Kubushyn <ksi@koi8.net>
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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 <asm/io.h>
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#include <asm/arch/timer_defs.h>
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#include <div64.h>
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DECLARE_GLOBAL_DATA_PTR;
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static struct davinci_timer * const timer =
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(struct davinci_timer *)CONFIG_SYS_TIMERBASE;
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#define TIMER_LOAD_VAL 0xffffffff
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#define TIM_CLK_DIV 16
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int timer_init(void)
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{
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/* We are using timer34 in unchained 32-bit mode, full speed */
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writel(0x0, &timer->tcr);
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writel(0x0, &timer->tgcr);
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writel(0x06 | ((TIM_CLK_DIV - 1) << 8), &timer->tgcr);
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writel(0x0, &timer->tim34);
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writel(TIMER_LOAD_VAL, &timer->prd34);
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writel(2 << 22, &timer->tcr);
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gd->timer_rate_hz = CONFIG_SYS_HZ_CLOCK / TIM_CLK_DIV;
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gd->timer_reset_value = 0;
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return(0);
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}
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/*
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* Get the current 64 bit timer tick count
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*/
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unsigned long long get_ticks(void)
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{
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unsigned long now = readl(&timer->tim34);
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/* increment tbu if tbl has rolled over */
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if (now < gd->tbl)
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gd->tbu++;
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gd->tbl = now;
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return (((unsigned long long)gd->tbu) << 32) | gd->tbl;
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}
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ulong get_timer(ulong base)
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{
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unsigned long long timer_diff;
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timer_diff = get_ticks() - gd->timer_reset_value;
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return lldiv(timer_diff, (gd->timer_rate_hz / CONFIG_SYS_HZ)) - base;
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}
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void __udelay(unsigned long usec)
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{
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unsigned long long endtime;
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endtime = lldiv((unsigned long long)usec * gd->timer_rate_hz,
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1000000UL);
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endtime += get_ticks();
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while (get_ticks() < endtime)
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;
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}
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/*
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* This function is derived from PowerPC code (timebase clock frequency).
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* On ARM it returns the number of timer ticks per second.
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*/
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ulong get_tbclk(void)
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{
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return gd->timer_rate_hz;
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}
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#ifdef CONFIG_HW_WATCHDOG
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static struct davinci_timer * const wdttimer =
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(struct davinci_timer *)CONFIG_SYS_WDTTIMERBASE;
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/*
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* See prufw2.pdf for using Timer as a WDT
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*/
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void davinci_hw_watchdog_enable(void)
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{
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writel(0x0, &wdttimer->tcr);
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writel(0x0, &wdttimer->tgcr);
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/* TIMMODE = 2h */
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writel(0x08 | 0x03 | ((TIM_CLK_DIV - 1) << 8), &wdttimer->tgcr);
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writel(CONFIG_SYS_WDT_PERIOD_LOW, &wdttimer->prd12);
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writel(CONFIG_SYS_WDT_PERIOD_HIGH, &wdttimer->prd34);
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writel(2 << 22, &wdttimer->tcr);
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writel(0x0, &wdttimer->tim12);
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writel(0x0, &wdttimer->tim34);
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/* set WDEN bit, WDKEY 0xa5c6 */
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writel(0xa5c64000, &wdttimer->wdtcr);
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/* clear counter register */
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writel(0xda7e4000, &wdttimer->wdtcr);
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}
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void davinci_hw_watchdog_reset(void)
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{
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writel(0xa5c64000, &wdttimer->wdtcr);
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writel(0xda7e4000, &wdttimer->wdtcr);
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}
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#endif
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