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
28 static unsigned char i8042_ctr;
29
i8042_enable_kbd_port(void)30 static 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
setup_wakeup_events(void)52 void 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
79 static struct delayed_work lid_task;
80 static int initialized;
81 /* yeeloong_report_lid_status will be implemented in yeeloong_laptop.c */
82 sci_handler yeeloong_report_lid_status;
83 EXPORT_SYMBOL(yeeloong_report_lid_status);
yeeloong_lid_update_task(struct work_struct * work)84 static 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
wakeup_loongson(void)90 int 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
mach_suspend(void)137 void __weak mach_suspend(void)
138 {
139 disable_mfgpt0_counter();
140 }
141
mach_resume(void)142 void __weak mach_resume(void)
143 {
144 enable_mfgpt0_counter();
145 }
146