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1 /* linux/arch/arm/plat-s3c24xx/pm.c
3 * Copyright (c) 2004-2006 Simtec Electronics
4 * Ben Dooks <ben@simtec.co.uk>
6 * S3C24XX Power Manager (Suspend-To-RAM) support
8 * See Documentation/arm/Samsung-S3C24XX/Suspend.txt for more information
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.
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.
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
24 * Parts based on arch/arm/mach-pxa/pm.c
26 * Thanks to Dimitry Andric for debugging
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>
38 #include <plat/regs-serial.h>
39 #include <mach/regs-clock.h>
40 #include <mach/regs-gpio.h>
41 #include <mach/regs-irq.h>
43 #include <asm/mach/time.h>
45 #include <plat/gpio-cfg.h>
50 #define PFX "s3c24xx-pm: "
52 static struct sleep_save core_save
[] = {
53 SAVE_ITEM(S3C2410_LOCKTIME
),
54 SAVE_ITEM(S3C2410_CLKCON
),
56 /* we restore the timings here, with the proviso that the board
57 * brings the system up in an slower, or equal frequency setting
58 * to the original system.
60 * if we cannot guarantee this, then things are going to go very
61 * wrong here, as we modify the refresh and both pll settings.
64 SAVE_ITEM(S3C2410_BWSCON
),
65 SAVE_ITEM(S3C2410_BANKCON0
),
66 SAVE_ITEM(S3C2410_BANKCON1
),
67 SAVE_ITEM(S3C2410_BANKCON2
),
68 SAVE_ITEM(S3C2410_BANKCON3
),
69 SAVE_ITEM(S3C2410_BANKCON4
),
70 SAVE_ITEM(S3C2410_BANKCON5
),
72 #ifndef CONFIG_CPU_FREQ
73 SAVE_ITEM(S3C2410_CLKDIVN
),
74 SAVE_ITEM(S3C2410_MPLLCON
),
75 SAVE_ITEM(S3C2410_REFRESH
),
77 SAVE_ITEM(S3C2410_UPLLCON
),
78 SAVE_ITEM(S3C2410_CLKSLOW
),
81 static struct sleep_save misc_save
[] = {
82 SAVE_ITEM(S3C2410_DCLKCON
),
85 /* s3c_pm_check_resume_pin
87 * check to see if the pin is configured correctly for sleep mode, and
88 * make any necessary adjustments if it is not
91 static void s3c_pm_check_resume_pin(unsigned int pin
, unsigned int irqoffs
)
93 unsigned long irqstate
;
94 unsigned long pinstate
;
95 int irq
= gpio_to_irq(pin
);
98 irqstate
= s3c_irqwake_intmask
& (1L<<irqoffs
);
100 irqstate
= s3c_irqwake_eintmask
& (1L<<irqoffs
);
102 pinstate
= s3c_gpio_getcfg(pin
);
105 if (pinstate
== S3C2410_GPIO_IRQ
)
106 S3C_PMDBG("Leaving IRQ %d (pin %d) as is\n", irq
, pin
);
108 if (pinstate
== S3C2410_GPIO_IRQ
) {
109 S3C_PMDBG("Disabling IRQ %d (pin %d)\n", irq
, pin
);
110 s3c_gpio_cfgpin(pin
, S3C2410_GPIO_INPUT
);
115 /* s3c_pm_configure_extint
117 * configure all external interrupt pins
120 void s3c_pm_configure_extint(void)
124 /* for each of the external interrupts (EINT0..EINT15) we
125 * need to check whether it is an external interrupt source,
126 * and then configure it as an input if it is not
129 for (pin
= S3C2410_GPF(0); pin
<= S3C2410_GPF(7); pin
++) {
130 s3c_pm_check_resume_pin(pin
, pin
- S3C2410_GPF(0));
133 for (pin
= S3C2410_GPG(0); pin
<= S3C2410_GPG(7); pin
++) {
134 s3c_pm_check_resume_pin(pin
, (pin
- S3C2410_GPG(0))+8);
139 void s3c_pm_restore_core(void)
141 s3c_pm_do_restore_core(core_save
, ARRAY_SIZE(core_save
));
142 s3c_pm_do_restore(misc_save
, ARRAY_SIZE(misc_save
));
145 void s3c_pm_save_core(void)
147 s3c_pm_do_save(misc_save
, ARRAY_SIZE(misc_save
));
148 s3c_pm_do_save(core_save
, ARRAY_SIZE(core_save
));