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   1 /*
   2  * File:         arch/blackfin/mach-common/pm.c
   3  * Based on:     arm/mach-omap/pm.c
   4  * Author:       Cliff Brake <cbrake@accelent.com> Copyright (c) 2001
   5  *
   6  * Created:      2001
   7  * Description:  Power management for the bfin
   8  *
   9  * Modified:     Nicolas Pitre - PXA250 support
  10  *                Copyright (c) 2002 Monta Vista Software, Inc.
  11  *               David Singleton - OMAP1510
  12  *                Copyright (c) 2002 Monta Vista Software, Inc.
  13  *               Dirk Behme <dirk.behme@de.bosch.com> - OMAP1510/1610
  14  *                Copyright 2004
  15  *               Copyright 2004-2006 Analog Devices Inc.
  16  *
  17  * Bugs:         Enter bugs at http://blackfin.uclinux.org/
  18  *
  19  * This program is free software; you can redistribute it and/or modify
  20  * it under the terms of the GNU General Public License as published by
  21  * the Free Software Foundation; either version 2 of the License, or
  22  * (at your option) any later version.
  23  *
  24  * This program is distributed in the hope that it will be useful,
  25  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  26  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  27  * GNU General Public License for more details.
  28  *
  29  * You should have received a copy of the GNU General Public License
  30  * along with this program; if not, see the file COPYING, or write
  31  * to the Free Software Foundation, Inc.,
  32  * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  33  */
  34
  35 #include <linux/pm.h>
  36 #include <linux/sched.h>
  37 #include <linux/proc_fs.h>
  38
  39 #include <asm/io.h>
  40 #include <asm/dpmc.h>
  41 #include <asm/irq.h>
  42
  43
  44 #ifdef CONFIG_PM_WAKEUP_GPIO_POLAR_H
  45 #define WAKEUP_TYPE     PM_WAKE_HIGH
  46 #endif
  47
  48 #ifdef CONFIG_PM_WAKEUP_GPIO_POLAR_L
  49 #define WAKEUP_TYPE     PM_WAKE_LOW
  50 #endif
  51
  52 #ifdef CONFIG_PM_WAKEUP_GPIO_POLAR_EDGE_F
  53 #define WAKEUP_TYPE     PM_WAKE_FALLING
  54 #endif
  55
  56 #ifdef CONFIG_PM_WAKEUP_GPIO_POLAR_EDGE_R
  57 #define WAKEUP_TYPE     PM_WAKE_RISING
  58 #endif
  59
  60 #ifdef CONFIG_PM_WAKEUP_GPIO_POLAR_EDGE_B
  61 #define WAKEUP_TYPE     PM_WAKE_BOTH_EDGES
  62 #endif
  63
  64 void bfin_pm_suspend_standby_enter(void)
  65 {
  66 #ifdef CONFIG_PM_WAKEUP_BY_GPIO
  67         gpio_pm_wakeup_request(CONFIG_PM_WAKEUP_GPIO_NUMBER, WAKEUP_TYPE);
  68 #endif
  69
  70 #if defined(CONFIG_PM_WAKEUP_BY_GPIO) || defined(CONFIG_PM_WAKEUP_GPIO_API)
  71         {
  72                 u32 flags;
  73
  74                 local_irq_save(flags);
  75
  76                 sleep_deeper(gpio_pm_setup()); /*Goto Sleep*/
  77
  78                 gpio_pm_restore();
  79
  80                 bfin_write_SIC_IWR(IWR_ENABLE_ALL);
  81
  82                 local_irq_restore(flags);
  83         }
  84 #endif
  85
  86 #if defined(CONFIG_PM_WAKEUP_GPIO_BY_SIC_IWR)
  87         sleep_deeper(CONFIG_PM_WAKEUP_SIC_IWR);
  88         bfin_write_SIC_IWR(IWR_ENABLE_ALL);
  89 #endif                          /* CONFIG_PM_WAKEUP_GPIO_BY_SIC_IWR */
  90 }
  91
  92
  93 /*
  94  *      bfin_pm_prepare - Do preliminary suspend work.
  95  *      @state:         suspend state we're entering.
  96  *
  97  */
  98 static int bfin_pm_prepare(suspend_state_t state)
  99 {
 100         int error = 0;
 101
 102         switch (state) {
 103         case PM_SUSPEND_STANDBY:
 104                 break;
 105         case PM_SUSPEND_MEM:
 106                 return -ENOTSUPP;
 107
 108         case PM_SUSPEND_DISK:
 109                 return -ENOTSUPP;
 110
 111         default:
 112                 return -EINVAL;
 113         }
 114
 115         return error;
 116 }
 117
 118 /*
 119  *      bfin_pm_enter - Actually enter a sleep state.
 120  *      @state:         State we're entering.
 121  *
 122  */
 123 static int bfin_pm_enter(suspend_state_t state)
 124 {
 125         switch (state) {
 126         case PM_SUSPEND_STANDBY:
 127                 bfin_pm_suspend_standby_enter();
 128                 break;
 129         case PM_SUSPEND_MEM:
 130                 return -ENOTSUPP;
 131
 132         case PM_SUSPEND_DISK:
 133                 return -ENOTSUPP;
 134
 135         default:
 136                 return -EINVAL;
 137         }
 138
 139         return 0;
 140 }
 141
 142 /*
 143  *      bfin_pm_finish - Finish up suspend sequence.
 144  *      @state:         State we're coming out of.
 145  *
 146  *      This is called after we wake back up (or if entering the sleep state
 147  *      failed).
 148  */
 149 static int bfin_pm_finish(suspend_state_t state)
 150 {
 151         switch (state) {
 152         case PM_SUSPEND_STANDBY:
 153                 break;
 154
 155         case PM_SUSPEND_MEM:
 156                 return -ENOTSUPP;
 157
 158         case PM_SUSPEND_DISK:
 159                 return -ENOTSUPP;
 160
 161         default:
 162                 return -EINVAL;
 163         }
 164
 165         return 0;
 166 }
 167
 168 struct pm_ops bfin_pm_ops = {
 169         .pm_disk_mode = PM_DISK_PLATFORM,
 170         .prepare = bfin_pm_prepare,
 171         .enter = bfin_pm_enter,
 172         .finish = bfin_pm_finish,
 173 };
 174
 175 static int __init bfin_pm_init(void)
 176 {
 177         pm_set_ops(&bfin_pm_ops);
 178         return 0;
 179 }
 180
 181 __initcall(bfin_pm_init);