1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 *  Lemote loongson2f family machines' specific suspend support
4 *
5 *  Copyright (C) 2009 Lemote Inc.
6 *  Author: Wu Zhangjin <wuzhangjin@gmail.com>
7 */
8
9#include <linux/suspend.h>
10#include <linux/interrupt.h>
11#include <linux/pm.h>
12#include <linux/i8042.h>
13#include <linux/export.h>
14
15#include <asm/i8259.h>
16#include <asm/mipsregs.h>
17#include <asm/bootinfo.h>
18
19#include <loongson.h>
20
21#include <cs5536/cs5536_mfgpt.h>
22#include "ec_kb3310b.h"
23
24#define I8042_KBD_IRQ		1
25#define I8042_CTR_KBDINT	0x01
26#define I8042_CTR_KBDDIS	0x10
27
28static unsigned char i8042_ctr;
29
30static int i8042_enable_kbd_port(void)
31{
32	if (i8042_command(&i8042_ctr, I8042_CMD_CTL_RCTR)) {
33		pr_err("i8042.c: Can't read CTR while enabling i8042 kbd port."
34		       "\n");
35		return -EIO;
36	}
37
38	i8042_ctr &= ~I8042_CTR_KBDDIS;
39	i8042_ctr |= I8042_CTR_KBDINT;
40
41	if (i8042_command(&i8042_ctr, I8042_CMD_CTL_WCTR)) {
42		i8042_ctr &= ~I8042_CTR_KBDINT;
43		i8042_ctr |= I8042_CTR_KBDDIS;
44		pr_err("i8042.c: Failed to enable KBD port.\n");
45
46		return -EIO;
47	}
48
49	return 0;
50}
51
52void setup_wakeup_events(void)
53{
54	int irq_mask;
55
56	switch (mips_machtype) {
57	case MACH_LEMOTE_ML2F7:
58	case MACH_LEMOTE_YL2F89:
59		/* open the keyboard irq in i8259A */
60		outb((0xff & ~(1 << I8042_KBD_IRQ)), PIC_MASTER_IMR);
61		irq_mask = inb(PIC_MASTER_IMR);
62
63		/* enable keyboard port */
64		i8042_enable_kbd_port();
65
66		/* Wakeup CPU via SCI lid open event */
67		outb(irq_mask & ~(1 << PIC_CASCADE_IR), PIC_MASTER_IMR);
68		inb(PIC_MASTER_IMR);
69		outb(0xff & ~(1 << (SCI_IRQ_NUM - 8)), PIC_SLAVE_IMR);
70		inb(PIC_SLAVE_IMR);
71
72		break;
73
74	default:
75		break;
76	}
77}
78
79static struct delayed_work lid_task;
80static int initialized;
81/* yeeloong_report_lid_status will be implemented in yeeloong_laptop.c */
82sci_handler yeeloong_report_lid_status;
83EXPORT_SYMBOL(yeeloong_report_lid_status);
84static void yeeloong_lid_update_task(struct work_struct *work)
85{
86	if (yeeloong_report_lid_status)
87		yeeloong_report_lid_status(BIT_LID_DETECT_ON);
88}
89
90int wakeup_loongson(void)
91{
92	int irq;
93
94	/* query the interrupt number */
95	irq = mach_i8259_irq();
96	if (irq < 0)
97		return 0;
98
99	printk(KERN_INFO "%s: irq = %d\n", __func__, irq);
100
101	if (irq == I8042_KBD_IRQ)
102		return 1;
103	else if (irq == SCI_IRQ_NUM) {
104		int ret, sci_event;
105		/* query the event number */
106		ret = ec_query_seq(CMD_GET_EVENT_NUM);
107		if (ret < 0)
108			return 0;
109		sci_event = ec_get_event_num();
110		if (sci_event < 0)
111			return 0;
112		if (sci_event == EVENT_LID) {
113			int lid_status;
114			/* check the LID status */
115			lid_status = ec_read(REG_LID_DETECT);
116			/* wakeup cpu when people open the LID */
117			if (lid_status == BIT_LID_DETECT_ON) {
118				/* If we call it directly here, the WARNING
119				 * will be sent out by getnstimeofday
120				 * via "WARN_ON(timekeeping_suspended);"
121				 * because we can not schedule in suspend mode.
122				 */
123				if (initialized == 0) {
124					INIT_DELAYED_WORK(&lid_task,
125						yeeloong_lid_update_task);
126					initialized = 1;
127				}
128				schedule_delayed_work(&lid_task, 1);
129				return 1;
130			}
131		}
132	}
133
134	return 0;
135}
136
137void __weak mach_suspend(void)
138{
139	disable_mfgpt0_counter();
140}
141
142void __weak mach_resume(void)
143{
144	enable_mfgpt0_counter();
145}
146