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/*
* (C) Copyright 2002
* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
* Marius Groeger <mgroeger@sysgo.de>
*
* (C) Copyright 2002
* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
* Alex Zuepke <azu@sysgo.de>
*
* (C) Copyright 2002
* Gary Jennejohn, DENX Software Engineering, <gj@denx.de>
*
* See file CREDITS for list of people who contributed to this
* project.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
#include <common.h>
#include <init.h>
#include <clock.h>
#include <notifier.h>
#include <mach/imx-regs.h>
#include <mach/clock.h>
#include <asm/io.h>
#define GPT(x) __REG(IMX_TIM1_BASE + (x))
#define timer_base (IMX_TIM1_BASE)
uint64_t imx_clocksource_read(void)
{
return readl(timer_base + GPT_TCN);
}
static struct clocksource cs = {
.read = imx_clocksource_read,
.mask = 0xffffffff,
.shift = 10,
};
static int imx_clocksource_clock_change(struct notifier_block *nb, unsigned long event, void *data)
{
cs.mult = clocksource_hz2mult(imx_get_gptclk(), cs.shift);
return 0;
}
static struct notifier_block imx_clock_notifier = {
.notifier_call = imx_clocksource_clock_change,
};
static int clocksource_init (void)
{
int i;
uint32_t val;
/* setup GP Timer 1 */
writel(TCTL_SWR, timer_base + GPT_TCTL);
#ifdef CONFIG_ARCH_IMX21
PCCR1 |= PCCR1_GPT1_EN;
#endif
#ifdef CONFIG_ARCH_IMX27
PCCR0 |= PCCR0_GPT1_EN;
PCCR1 |= PCCR1_PERCLK1_EN;
#endif
for (i = 0; i < 100; i++)
writel(0, timer_base + GPT_TCTL); /* We have no udelay by now */
writel(0, timer_base + GPT_TPRER);
val = readl(timer_base + GPT_TCTL);
val |= TCTL_FRR | (1 << TCTL_CLKSOURCE) | TCTL_TEN; /* Freerun Mode, PERCLK1 input */
writel(val, timer_base + GPT_TCTL);
cs.mult = clocksource_hz2mult(imx_get_gptclk(), cs.shift);
init_clock(&cs);
clock_register_client(&imx_clock_notifier);
return 0;
}
core_initcall(clocksource_init);
/*
* Reset the cpu by setting up the watchdog timer and let it time out
*/
void __noreturn reset_cpu (unsigned long ignored)
{
/* Disable watchdog and set Time-Out field to 0 */
WCR = 0x0000;
/* Write Service Sequence */
WSR = 0x5555;
WSR = 0xAAAA;
/* Enable watchdog */
WCR = WCR_WDE;
while (1);
/*NOTREACHED*/
}
EXPORT_SYMBOL(reset_cpu);
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