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#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
64void 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 */
98static 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
106	case PM_SUSPEND_MEM:
107		return -ENOTSUPP;
108
109	default:
110		return -EINVAL;
111	}
112
113	return error;
114}
115
116/*
117 *	bfin_pm_enter - Actually enter a sleep state.
118 *	@state:		State we're entering.
119 *
120 */
121static int bfin_pm_enter(suspend_state_t state)
122{
123	switch (state) {
124	case PM_SUSPEND_STANDBY:
125		bfin_pm_suspend_standby_enter();
126		break;
127
128	case PM_SUSPEND_MEM:
129		return -ENOTSUPP;
130
131	default:
132		return -EINVAL;
133	}
134
135	return 0;
136}
137
138/*
139 *	bfin_pm_finish - Finish up suspend sequence.
140 *	@state:		State we're coming out of.
141 *
142 *	This is called after we wake back up (or if entering the sleep state
143 *	failed).
144 */
145static int bfin_pm_finish(suspend_state_t state)
146{
147	switch (state) {
148	case PM_SUSPEND_STANDBY:
149		break;
150
151	case PM_SUSPEND_MEM:
152		return -ENOTSUPP;
153
154	default:
155		return -EINVAL;
156	}
157
158	return 0;
159}
160
161struct pm_ops bfin_pm_ops = {
162	.prepare = bfin_pm_prepare,
163	.enter = bfin_pm_enter,
164	.finish = bfin_pm_finish,
165};
166
167static int __init bfin_pm_init(void)
168{
169	pm_set_ops(&bfin_pm_ops);
170	return 0;
171}
172
173__initcall(bfin_pm_init);
174