release/src-rt-6.x.4708/linux/linux-2.6.36/arch/mips/loongson/lemote-2f/pm.c

   1 /*
   2  *  Lemote loongson2f family machines' specific suspend support
   3  *
   4  *  Copyright (C) 2009 Lemote Inc.
   5  *  Author: Wu Zhangjin <wuzhangjin@gmail.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  */
  12
  13 #include <linux/suspend.h>
  14 #include <linux/interrupt.h>
  15 #include <linux/pm.h>
  16 #include <linux/i8042.h>
  17 #include <linux/module.h>
  18
  19 #include <asm/i8259.h>
  20 #include <asm/mipsregs.h>
  21 #include <asm/bootinfo.h>
  22
  23 #include <loongson.h>
  24
  25 #include <cs5536/cs5536_mfgpt.h>
  26 #include "ec_kb3310b.h"
  27
  28 #define I8042_KBD_IRQ           1
  29 #define I8042_CTR_KBDINT        0x01
  30 #define I8042_CTR_KBDDIS        0x10
  31
  32 static unsigned char i8042_ctr;
  33
  34 static int i8042_enable_kbd_port(void)
  35 {
  36         if (i8042_command(&i8042_ctr, I8042_CMD_CTL_RCTR)) {
  37                 pr_err("i8042.c: Can't read CTR while enabling i8042 kbd port."
  38                        "\n");
  39                 return -EIO;
  40         }
  41
  42         i8042_ctr &= ~I8042_CTR_KBDDIS;
  43         i8042_ctr |= I8042_CTR_KBDINT;
  44
  45         if (i8042_command(&i8042_ctr, I8042_CMD_CTL_WCTR)) {
  46                 i8042_ctr &= ~I8042_CTR_KBDINT;
  47                 i8042_ctr |= I8042_CTR_KBDDIS;
  48                 pr_err("i8042.c: Failed to enable KBD port.\n");
  49
  50                 return -EIO;
  51         }
  52
  53         return 0;
  54 }
  55
  56 void setup_wakeup_events(void)
  57 {
  58         int irq_mask;
  59
  60         switch (mips_machtype) {
  61         case MACH_LEMOTE_ML2F7:
  62         case MACH_LEMOTE_YL2F89:
  63                 /* open the keyboard irq in i8259A */
  64                 outb((0xff & ~(1 << I8042_KBD_IRQ)), PIC_MASTER_IMR);
  65                 irq_mask = inb(PIC_MASTER_IMR);
  66
  67                 /* enable keyboard port */
  68                 i8042_enable_kbd_port();
  69
  70                 /* Wakeup CPU via SCI lid open event */
  71                 outb(irq_mask & ~(1 << PIC_CASCADE_IR), PIC_MASTER_IMR);
  72                 inb(PIC_MASTER_IMR);
  73                 outb(0xff & ~(1 << (SCI_IRQ_NUM - 8)), PIC_SLAVE_IMR);
  74                 inb(PIC_SLAVE_IMR);
  75
  76                 break;
  77
  78         default:
  79                 break;
  80         }
  81 }
  82
  83 static struct delayed_work lid_task;
  84 static int initialized;
  85 /* yeeloong_report_lid_status will be implemented in yeeloong_laptop.c */
  86 sci_handler yeeloong_report_lid_status;
  87 EXPORT_SYMBOL(yeeloong_report_lid_status);
  88 static void yeeloong_lid_update_task(struct work_struct *work)
  89 {
  90         if (yeeloong_report_lid_status)
  91                 yeeloong_report_lid_status(BIT_LID_DETECT_ON);
  92 }
  93
  94 int wakeup_loongson(void)
  95 {
  96         int irq;
  97
  98         /* query the interrupt number */
  99         irq = mach_i8259_irq();
 100         if (irq < 0)
 101                 return 0;
 102
 103         printk(KERN_INFO "%s: irq = %d\n", __func__, irq);
 104
 105         if (irq == I8042_KBD_IRQ)
 106                 return 1;
 107         else if (irq == SCI_IRQ_NUM) {
 108                 int ret, sci_event;
 109                 /* query the event number */
 110                 ret = ec_query_seq(CMD_GET_EVENT_NUM);
 111                 if (ret < 0)
 112                         return 0;
 113                 sci_event = ec_get_event_num();
 114                 if (sci_event < 0)
 115                         return 0;
 116                 if (sci_event == EVENT_LID) {
 117                         int lid_status;
 118                         /* check the LID status */
 119                         lid_status = ec_read(REG_LID_DETECT);
 120                         /* wakeup cpu when people open the LID */
 121                         if (lid_status == BIT_LID_DETECT_ON) {
 122                                 /* If we call it directly here, the WARNING
 123                                  * will be sent out by getnstimeofday
 124                                  * via "WARN_ON(timekeeping_suspended);"
 125                                  * because we can not schedule in suspend mode.
 126                                  */
 127                                 if (initialized == 0) {
 128                                         INIT_DELAYED_WORK(&lid_task,
 129                                                 yeeloong_lid_update_task);
 130                                         initialized = 1;
 131                                 }
 132                                 schedule_delayed_work(&lid_task, 1);
 133                                 return 1;
 134                         }
 135                 }
 136         }
 137
 138         return 0;
 139 }
 140
 141 void __weak mach_suspend(void)
 142 {
 143         disable_mfgpt0_counter();
 144 }
 145
 146 void __weak mach_resume(void)
 147 {
 148         enable_mfgpt0_counter();
 149 }