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 <wuzj@lemote.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
  18 #include <asm/i8259.h>
  19 #include <asm/mipsregs.h>
  20 #include <asm/bootinfo.h>
  21
  22 #include <loongson.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
  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
  52 /*
  53  * The i8042 is connnected to i8259A
  54  */
  55 void setup_wakeup_events(void)
  56 {
  57         int irq_mask;
  58
  59         switch (mips_machtype) {
  60         case MACH_LEMOTE_ML2F7:
  61         case MACH_LEMOTE_YL2F89:
  62                 /* open the keyboard irq in i8259A */
  63                 outb((0xff & ~(1 << I8042_KBD_IRQ)), PIC_MASTER_IMR);
  64                 irq_mask = inb(PIC_MASTER_IMR);
  65
  66                 /* enable keyboard port */
  67                 i8042_enable_kbd_port();
  68                 break;
  69
  70         default:
  71                 break;
  72         }
  73 }