reset.c

  1// SPDX-License-Identifier: GPL-2.0-or-later
  2/* Board-specific reboot/shutdown routines
  3 *
  4 * Copyright (c) 2009 Philippe Vachon <philippe@cowpig.ca>
  5 *
  6 * Copyright (C) 2009 Lemote Inc.
  7 * Author: Wu Zhangjin, wuzhangjin@gmail.com
  8 */
  9
 10#include <linux/io.h>
 11#include <linux/delay.h>
 12#include <linux/types.h>
 13
 14#include <asm/bootinfo.h>
 15
 16#include <loongson.h>
 17
 18#include <cs5536/cs5536.h>
 19#include "ec_kb3310b.h"
 20
 21static void reset_cpu(void)
 22{
 23	/*
 24	 * reset cpu to full speed, this is needed when enabling cpu frequency
 25	 * scalling
 26	 */
 27	writel(readl(LOONGSON_CHIPCFG) | 0x7, LOONGSON_CHIPCFG);
 28}
 29
 30/* reset support for fuloong2f */
 31
 32static void fl2f_reboot(void)
 33{
 34	reset_cpu();
 35
 36	/* send a reset signal to south bridge.
 37	 *
 38	 * NOTE: if enable "Power Management" in kernel, rtl8169 will not reset
 39	 * normally with this reset operation and it will not work in PMON, but
 40	 * you can type halt command and then reboot, seems the hardware reset
 41	 * logic not work normally.
 42	 */
 43	{
 44		u32 hi, lo;
 45		_rdmsr(DIVIL_MSR_REG(DIVIL_SOFT_RESET), &hi, &lo);
 46		lo |= 0x00000001;
 47		_wrmsr(DIVIL_MSR_REG(DIVIL_SOFT_RESET), hi, lo);
 48	}
 49}
 50
 51static void fl2f_shutdown(void)
 52{
 53	u32 hi, lo, val;
 54	int gpio_base;
 55
 56	/* get gpio base */
 57	_rdmsr(DIVIL_MSR_REG(DIVIL_LBAR_GPIO), &hi, &lo);
 58	gpio_base = lo & 0xff00;
 59
 60	/* make cs5536 gpio13 output enable */
 61	val = inl(gpio_base + GPIOL_OUT_EN);
 62	val &= ~(1 << (16 + 13));
 63	val |= (1 << 13);
 64	outl(val, gpio_base + GPIOL_OUT_EN);
 65	mmiowb();
 66	/* make cs5536 gpio13 output low level voltage. */
 67	val = inl(gpio_base + GPIOL_OUT_VAL) & ~(1 << (13));
 68	val |= (1 << (16 + 13));
 69	outl(val, gpio_base + GPIOL_OUT_VAL);
 70	mmiowb();
 71}
 72
 73/* reset support for yeeloong2f and mengloong2f notebook */
 74
 75static void ml2f_reboot(void)
 76{
 77	reset_cpu();
 78
 79	/* sending an reset signal to EC(embedded controller) */
 80	ec_write(REG_RESET, BIT_RESET_ON);
 81}
 82
 83#define yl2f89_reboot ml2f_reboot
 84
 85/* menglong(7inches) laptop has different shutdown logic from 8.9inches */
 86#define EC_SHUTDOWN_IO_PORT_HIGH 0xff2d
 87#define EC_SHUTDOWN_IO_PORT_LOW	 0xff2e
 88#define EC_SHUTDOWN_IO_PORT_DATA 0xff2f
 89#define REG_SHUTDOWN_HIGH	 0xFC
 90#define REG_SHUTDOWN_LOW	 0x29
 91#define BIT_SHUTDOWN_ON		 (1 << 1)
 92
 93static void ml2f_shutdown(void)
 94{
 95	u8 val;
 96	u64 i;
 97
 98	outb(REG_SHUTDOWN_HIGH, EC_SHUTDOWN_IO_PORT_HIGH);
 99	outb(REG_SHUTDOWN_LOW, EC_SHUTDOWN_IO_PORT_LOW);
100	mmiowb();
101	val = inb(EC_SHUTDOWN_IO_PORT_DATA);
102	outb(val & (~BIT_SHUTDOWN_ON), EC_SHUTDOWN_IO_PORT_DATA);
103	mmiowb();
104	/* need enough wait here... how many microseconds needs? */
105	for (i = 0; i < 0x10000; i++)
106		delay();
107	outb(val | BIT_SHUTDOWN_ON, EC_SHUTDOWN_IO_PORT_DATA);
108	mmiowb();
109}
110
111static void yl2f89_shutdown(void)
112{
113	/* cpu-gpio0 output low */
114	LOONGSON_GPIODATA &= ~0x00000001;
115	/* cpu-gpio0 as output */
116	LOONGSON_GPIOIE &= ~0x00000001;
117}
118
119void mach_prepare_reboot(void)
120{
121	switch (mips_machtype) {
122	case MACH_LEMOTE_FL2F:
123	case MACH_LEMOTE_NAS:
124	case MACH_LEMOTE_LL2F:
125		fl2f_reboot();
126		break;
127	case MACH_LEMOTE_ML2F7:
128		ml2f_reboot();
129		break;
130	case MACH_LEMOTE_YL2F89:
131		yl2f89_reboot();
132		break;
133	default:
134		break;
135	}
136}
137
138void mach_prepare_shutdown(void)
139{
140	switch (mips_machtype) {
141	case MACH_LEMOTE_FL2F:
142	case MACH_LEMOTE_NAS:
143	case MACH_LEMOTE_LL2F:
144		fl2f_shutdown();
145		break;
146	case MACH_LEMOTE_ML2F7:
147		ml2f_shutdown();
148		break;
149	case MACH_LEMOTE_YL2F89:
150		yl2f89_shutdown();
151		break;
152	default:
153		break;
154	}
155}