1 /* linux/arch/arm/plat-s3c24xx/pm.c
2 *
3 * Copyright (c) 2004,2006 Simtec Electronics
4 * Ben Dooks <ben@simtec.co.uk>
5 *
6 * S3C24XX Power Manager (Suspend-To-RAM) support
7 *
8 * See Documentation/arm/Samsung-S3C24XX/Suspend.txt for more information
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 *
24 * Parts based on arch/arm/mach-pxa/pm.c
25 *
26 * Thanks to Dimitry Andric for debugging
27 */
28
29 #include <linux/init.h>
30 #include <linux/suspend.h>
31 #include <linux/errno.h>
32 #include <linux/time.h>
33 #include <linux/gpio.h>
34 #include <linux/interrupt.h>
35 #include <linux/serial_core.h>
36 #include <linux/io.h>
37
38 #include <plat/regs-serial.h>
39 #include <mach/regs-clock.h>
40 #include <mach/regs-gpio.h>
41 #include <mach/regs-mem.h>
42 #include <mach/regs-irq.h>
43
44 #include <asm/mach/time.h>
45
46 #include <plat/pm.h>
47
48 #define PFX "s3c24xx-pm: "
49
50 static struct sleep_save core_save[] = {
51 SAVE_ITEM(S3C2410_LOCKTIME),
52 SAVE_ITEM(S3C2410_CLKCON),
53
54 /* we restore the timings here, with the proviso that the board
55 * brings the system up in an slower, or equal frequency setting
56 * to the original system.
57 *
58 * if we cannot guarantee this, then things are going to go very
59 * wrong here, as we modify the refresh and both pll settings.
60 */
61
62 SAVE_ITEM(S3C2410_BWSCON),
63 SAVE_ITEM(S3C2410_BANKCON0),
64 SAVE_ITEM(S3C2410_BANKCON1),
65 SAVE_ITEM(S3C2410_BANKCON2),
66 SAVE_ITEM(S3C2410_BANKCON3),
67 SAVE_ITEM(S3C2410_BANKCON4),
68 SAVE_ITEM(S3C2410_BANKCON5),
69
70 #ifndef CONFIG_CPU_FREQ
71 SAVE_ITEM(S3C2410_CLKDIVN),
72 SAVE_ITEM(S3C2410_MPLLCON),
73 SAVE_ITEM(S3C2410_REFRESH),
74 #endif
75 SAVE_ITEM(S3C2410_UPLLCON),
76 SAVE_ITEM(S3C2410_CLKSLOW),
77 };
78
79 static struct sleep_save misc_save[] = {
80 SAVE_ITEM(S3C2410_DCLKCON),
81 };
82
83 /* s3c_pm_check_resume_pin
84 *
85 * check to see if the pin is configured correctly for sleep mode, and
86 * make any necessary adjustments if it is not
87 */
88
89 static void s3c_pm_check_resume_pin(unsigned int pin, unsigned int irqoffs)
90 {
91 unsigned long irqstate;
92 unsigned long pinstate;
93 int irq = s3c2410_gpio_getirq(pin);
94
95 if (irqoffs < 4)
96 irqstate = s3c_irqwake_intmask & (1L<<irqoffs);
97 else
98 irqstate = s3c_irqwake_eintmask & (1L<<irqoffs);
99
100 pinstate = s3c2410_gpio_getcfg(pin);
101
102 if (!irqstate) {
103 if (pinstate == S3C2410_GPIO_IRQ)
104 S3C_PMDBG("Leaving IRQ %d (pin %d) enabled\n", irq, pin);
105 } else {
106 if (pinstate == S3C2410_GPIO_IRQ) {
107 S3C_PMDBG("Disabling IRQ %d (pin %d)\n", irq, pin);
108 s3c2410_gpio_cfgpin(pin, S3C2410_GPIO_INPUT);
109 }
110 }
111 }
112
113 /* s3c_pm_configure_extint
114 *
115 * configure all external interrupt pins
116 */
117
118 void s3c_pm_configure_extint(void)
119 {
120 int pin;
121
122 /* for each of the external interrupts (EINT0..EINT15) we
123 * need to check wether it is an external interrupt source,
124 * and then configure it as an input if it is not
125 */
126
127 for (pin = S3C2410_GPF(0); pin <= S3C2410_GPF(7); pin++) {
128 s3c_pm_check_resume_pin(pin, pin - S3C2410_GPF(0));
129 }
130
131 for (pin = S3C2410_GPG(0); pin <= S3C2410_GPG(7); pin++) {
132 s3c_pm_check_resume_pin(pin, (pin - S3C2410_GPG(0))+8);
133 }
134 }
135
136
137 void s3c_pm_restore_core(void)
138 {
139 s3c_pm_do_restore_core(core_save, ARRAY_SIZE(core_save));
140 s3c_pm_do_restore(misc_save, ARRAY_SIZE(misc_save));
141 }
142
143 void s3c_pm_save_core(void)
144 {
145 s3c_pm_do_save(misc_save, ARRAY_SIZE(misc_save));
146 s3c_pm_do_save(core_save, ARRAY_SIZE(core_save));
147 }
148
149
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