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/init.h>
  14 #include <linux/pm.h>
  15 #include <linux/sched.h>
  16 #include <linux/interrupt.h>
  17 #include <linux/sysctl.h>
  18 #include <linux/errno.h>
  19 #include <linux/delay.h>
  20 #include <asm/uaccess.h>
  21
  22 #include <asm/mb86943a.h>
  23
  24 #include "local.h"
  25
  26 static unsigned long imask;
  27 /*
  28  * Setup interrupt masks, etc to enable wakeup by power switch
  29  */
  30 static void mb93093_power_switch_setup(void)
  31 {
  32         /* mask all but FPGA interrupt sources. */
  33         imask = *(volatile unsigned long *)0xfeff9820;
  34         *(volatile unsigned long *)0xfeff9820 = ~(1 << (IRQ_XIRQ2_LEVEL + 16)) & 0xfffe0000;
  35 }
  36
  37 /*
  38  * Cleanup interrupt masks, etc after wakeup by power switch
  39  */
  40 static void mb93093_power_switch_cleanup(void)
  41 {
  42         *(volatile unsigned long *)0xfeff9820 = imask;
  43 }
  44
  45 /*
  46  * Return non-zero if wakeup irq was caused by power switch
  47  */
  48 static int mb93093_power_switch_check(void)
  49 {
  50         return 1;
  51 }
  52
  53 /*
  54  * Initialize power interface
  55  */
  56 static int __init mb93093_pm_init(void)
  57 {
  58         __power_switch_wake_setup = mb93093_power_switch_setup;
  59         __power_switch_wake_check = mb93093_power_switch_check;
  60         __power_switch_wake_cleanup = mb93093_power_switch_cleanup;
  61         return 0;
  62 }
  63
  64 __initcall(mb93093_pm_init);
  65