arch/mips/loongson2ef/lemote-2f/reset.c

Source file repositories/reference/linux-study-clean/arch/mips/loongson2ef/lemote-2f/reset.c

File Facts

System
Linux kernel
Corpus path
arch/mips/loongson2ef/lemote-2f/reset.c
Extension
.c
Size
3370 bytes
Lines
156
Domain
Architecture Layer
Bucket
arch/mips
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0-or-later
/* Board-specific reboot/shutdown routines
 *
 * Copyright (c) 2009 Philippe Vachon <philippe@cowpig.ca>
 *
 * Copyright (C) 2009 Lemote Inc.
 * Author: Wu Zhangjin, wuzhangjin@gmail.com
 */

#include <linux/io.h>
#include <linux/delay.h>
#include <linux/types.h>

#include <asm/bootinfo.h>

#include <loongson.h>

#include <cs5536/cs5536.h>
#include "ec_kb3310b.h"

static void reset_cpu(void)
{
	/*
	 * reset cpu to full speed, this is needed when enabling cpu frequency
	 * scalling
	 */
	writel(readl(LOONGSON_CHIPCFG) | 0x7, LOONGSON_CHIPCFG);
}

/* reset support for fuloong2f */

static void fl2f_reboot(void)
{
	reset_cpu();

	/* send a reset signal to south bridge.
	 *
	 * NOTE: if enable "Power Management" in kernel, rtl8169 will not reset
	 * normally with this reset operation and it will not work in PMON, but
	 * you can type halt command and then reboot, seems the hardware reset
	 * logic not work normally.
	 */
	{
		u32 hi, lo;
		_rdmsr(DIVIL_MSR_REG(DIVIL_SOFT_RESET), &hi, &lo);
		lo |= 0x00000001;
		_wrmsr(DIVIL_MSR_REG(DIVIL_SOFT_RESET), hi, lo);
	}
}

static void fl2f_shutdown(void)
{
	u32 hi, lo, val;
	int gpio_base;

	/* get gpio base */
	_rdmsr(DIVIL_MSR_REG(DIVIL_LBAR_GPIO), &hi, &lo);
	gpio_base = lo & 0xff00;

	/* make cs5536 gpio13 output enable */
	val = inl(gpio_base + GPIOL_OUT_EN);
	val &= ~(1 << (16 + 13));
	val |= (1 << 13);
	outl(val, gpio_base + GPIOL_OUT_EN);
	mmiowb();
	/* make cs5536 gpio13 output low level voltage. */
	val = inl(gpio_base + GPIOL_OUT_VAL) & ~(1 << (13));
	val |= (1 << (16 + 13));
	outl(val, gpio_base + GPIOL_OUT_VAL);
	mmiowb();
}

/* reset support for yeeloong2f and mengloong2f notebook */

static void ml2f_reboot(void)
{
	reset_cpu();

	/* sending an reset signal to EC(embedded controller) */
	ec_write(REG_RESET, BIT_RESET_ON);
}

#define yl2f89_reboot ml2f_reboot

/* menglong(7inches) laptop has different shutdown logic from 8.9inches */
#define EC_SHUTDOWN_IO_PORT_HIGH 0xff2d
#define EC_SHUTDOWN_IO_PORT_LOW	 0xff2e
#define EC_SHUTDOWN_IO_PORT_DATA 0xff2f
#define REG_SHUTDOWN_HIGH	 0xFC
#define REG_SHUTDOWN_LOW	 0x29

Annotation

Implementation Notes