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// SPDX-License-Identifier: GPL-2.0+
/*
* JZ4780 common routines
*
* Copyright (c) 2013 Imagination Technologies
* Author: Paul Burton <paul.burton@imgtec.com>
*/
#include <config.h>
#include <common.h>
#include <asm/io.h>
#include <linux/bitops.h>
#include <mach/jz4780.h>
/* WDT */
#define WDT_TDR 0x00
#define WDT_TCER 0x04
#define WDT_TCNT 0x08
#define WDT_TCSR 0x0C
/* Register definition */
#define WDT_TCSR_PRESCALE_BIT 3
#define WDT_TCSR_PRESCALE_MASK (0x7 << WDT_TCSR_PRESCALE_BIT)
#define WDT_TCSR_PRESCALE1 (0x0 << WDT_TCSR_PRESCALE_BIT)
#define WDT_TCSR_PRESCALE4 (0x1 << WDT_TCSR_PRESCALE_BIT)
#define WDT_TCSR_PRESCALE16 (0x2 << WDT_TCSR_PRESCALE_BIT)
#define WDT_TCSR_PRESCALE64 (0x3 << WDT_TCSR_PRESCALE_BIT)
#define WDT_TCSR_PRESCALE256 (0x4 << WDT_TCSR_PRESCALE_BIT)
#define WDT_TCSR_PRESCALE1024 (0x5 << WDT_TCSR_PRESCALE_BIT)
#define WDT_TCSR_EXT_EN BIT(2)
#define WDT_TCSR_RTC_EN BIT(1)
#define WDT_TCSR_PCK_EN BIT(0)
#define WDT_TCER_TCEN BIT(0)
void _machine_restart(void)
{
void __iomem *wdt_regs = (void __iomem *)WDT_BASE;
/* EXTAL as the timer clock input. */
writew(WDT_TCSR_PRESCALE1 | WDT_TCSR_EXT_EN, wdt_regs + WDT_TCSR);
/* Reset the WDT counter and timeout. */
writew(0, wdt_regs + WDT_TCNT);
writew(0, wdt_regs + WDT_TDR);
jz4780_tcu_wdt_start();
/* WDT start */
writeb(WDT_TCER_TCEN, wdt_regs + WDT_TCER);
for (;;)
;
}
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