arch/frv/kernel/pm-mb93093.c

   1 /*
   2  * FR-V MB93093 Power Management Routines
   3  *
   4  * Copyright (c) 2004 Red Hat, Inc.
   5  *
   6  * Written by: msalter@redhat.com
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License.
  10  *
  11  */
  12
  13 #include <linux/config.h>
  14 #include <linux/init.h>
  15 #include <linux/pm.h>
  16 #include <linux/sched.h>
  17 #include <linux/interrupt.h>
  18 #include <linux/sysctl.h>
  19 #include <linux/errno.h>
  20 #include <linux/delay.h>
  21 #include <asm/uaccess.h>
  22
  23 #include <asm/mb86943a.h>
  24
  25 #include "local.h"
  26
  27 static unsigned long imask;
  28 /*
  29  * Setup interrupt masks, etc to enable wakeup by power switch
  30  */
  31 static void mb93093_power_switch_setup(void)
  32 {
  33         /* mask all but FPGA interrupt sources. */
  34         imask = *(volatile unsigned long *)0xfeff9820;
  35         *(volatile unsigned long *)0xfeff9820 = ~(1 << (IRQ_XIRQ2_LEVEL + 16)) & 0xfffe0000;
  36 }
  37
  38 /*
  39  * Cleanup interrupt masks, etc after wakeup by power switch
  40  */
  41 static void mb93093_power_switch_cleanup(void)
  42 {
  43         *(volatile unsigned long *)0xfeff9820 = imask;
  44 }
  45
  46 /*
  47  * Return non-zero if wakeup irq was caused by power switch
  48  */
  49 static int mb93093_power_switch_check(void)
  50 {
  51         return 1;
  52 }
  53
  54 /*
  55  * Initialize power interface
  56  */
  57 static int __init mb93093_pm_init(void)
  58 {
  59         __power_switch_wake_setup = mb93093_power_switch_setup;
  60         __power_switch_wake_check = mb93093_power_switch_check;
  61         __power_switch_wake_cleanup = mb93093_power_switch_cleanup;
  62         return 0;
  63 }
  64
  65 __initcall(mb93093_pm_init);
  66