dac51fb06f22b5f2e8037f923c52c13ac693d383
[linux-2.6.git] / arch / blackfin / mach-common / pm.c
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/suspend.h>
36 #include <linux/sched.h>
37 #include <linux/proc_fs.h>
38 #include <linux/io.h>
39 #include <linux/irq.h>
40
41 #include <asm/dpmc.h>
42 #include <asm/gpio.h>
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  *      bfin_pm_valid - Tell the PM core that we only support the standby sleep
94  *                      state
95  *      @state:         suspend state we're checking.
96  *
97  */
98 static int bfin_pm_valid(suspend_state_t state)
99 {
100         return (state == PM_SUSPEND_STANDBY);
101 }
102
103 /*
104  *      bfin_pm_enter - Actually enter a sleep state.
105  *      @state:         State we're entering.
106  *
107  */
108 static int bfin_pm_enter(suspend_state_t state)
109 {
110         switch (state) {
111         case PM_SUSPEND_STANDBY:
112                 bfin_pm_suspend_standby_enter();
113                 break;
114
115         case PM_SUSPEND_MEM:
116                 return -ENOTSUPP;
117
118         default:
119                 return -EINVAL;
120         }
121
122         return 0;
123 }
124
125 struct platform_suspend_ops bfin_pm_ops = {
126         .enter = bfin_pm_enter,
127         .valid  = bfin_pm_valid,
128 };
129
130 static int __init bfin_pm_init(void)
131 {
132         suspend_set_ops(&bfin_pm_ops);
133         return 0;
134 }
135
136 __initcall(bfin_pm_init);