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}
156