cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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reset.c (3370B)

      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}