Merge master.kernel.org:/pub/scm/linux/kernel/git/davem/sparc-2.6
[linux-2.6] / 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/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);