1 // SPDX-License-Identifier: GPL-2.0+
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.rst for more information
9 //
10 // Parts based on arch/arm/mach-pxa/pm.c
11 //
12 // Thanks to Dimitry Andric for debugging
13
14 #include <linux/init.h>
15 #include <linux/suspend.h>
16 #include <linux/errno.h>
17 #include <linux/time.h>
18 #include <linux/gpio.h>
19 #include <linux/interrupt.h>
20 #include <linux/serial_core.h>
21 #include <linux/serial_s3c.h>
22 #include <linux/io.h>
23
24 #include "regs-clock.h"
25 #include "regs-gpio.h"
26 #include "regs-irq.h"
27 #include "gpio-samsung.h"
28
29 #include <asm/mach/time.h>
30
31 #include "gpio-cfg.h"
32 #include "pm.h"
33
34 #include "regs-mem-s3c24xx.h"
35
36 #define PFX "s3c24xx-pm: "
37
38 #ifdef CONFIG_PM_SLEEP
39 static struct sleep_save core_save[] = {
40 /* we restore the timings here, with the proviso that the board
41 * brings the system up in an slower, or equal frequency setting
42 * to the original system.
43 *
44 * if we cannot guarantee this, then things are going to go very
45 * wrong here, as we modify the refresh and both pll settings.
46 */
47
48 SAVE_ITEM(S3C2410_BWSCON),
49 SAVE_ITEM(S3C2410_BANKCON0),
50 SAVE_ITEM(S3C2410_BANKCON1),
51 SAVE_ITEM(S3C2410_BANKCON2),
52 SAVE_ITEM(S3C2410_BANKCON3),
53 SAVE_ITEM(S3C2410_BANKCON4),
54 SAVE_ITEM(S3C2410_BANKCON5),
55 };
56 #endif
57
58 /* s3c_pm_check_resume_pin
59 *
60 * check to see if the pin is configured correctly for sleep mode, and
61 * make any necessary adjustments if it is not
62 */
63
s3c_pm_check_resume_pin(unsigned int pin,unsigned int irqoffs)64 static void s3c_pm_check_resume_pin(unsigned int pin, unsigned int irqoffs)
65 {
66 unsigned long irqstate;
67 unsigned long pinstate;
68 int irq = gpio_to_irq(pin);
69
70 if (irqoffs < 4)
71 irqstate = s3c_irqwake_intmask & (1L<<irqoffs);
72 else
73 irqstate = s3c_irqwake_eintmask & (1L<<irqoffs);
74
75 pinstate = s3c_gpio_getcfg(pin);
76
77 if (!irqstate) {
78 if (pinstate == S3C2410_GPIO_IRQ)
79 S3C_PMDBG("Leaving IRQ %d (pin %d) as is\n", irq, pin);
80 } else {
81 if (pinstate == S3C2410_GPIO_IRQ) {
82 S3C_PMDBG("Disabling IRQ %d (pin %d)\n", irq, pin);
83 s3c_gpio_cfgpin(pin, S3C2410_GPIO_INPUT);
84 }
85 }
86 }
87
88 /* s3c_pm_configure_extint
89 *
90 * configure all external interrupt pins
91 */
92
s3c_pm_configure_extint(void)93 void s3c_pm_configure_extint(void)
94 {
95 int pin;
96
97 /* for each of the external interrupts (EINT0..EINT15) we
98 * need to check whether it is an external interrupt source,
99 * and then configure it as an input if it is not
100 */
101
102 for (pin = S3C2410_GPF(0); pin <= S3C2410_GPF(7); pin++) {
103 s3c_pm_check_resume_pin(pin, pin - S3C2410_GPF(0));
104 }
105
106 for (pin = S3C2410_GPG(0); pin <= S3C2410_GPG(7); pin++) {
107 s3c_pm_check_resume_pin(pin, (pin - S3C2410_GPG(0))+8);
108 }
109 }
110
111 #ifdef CONFIG_PM_SLEEP
s3c_pm_restore_core(void)112 void s3c_pm_restore_core(void)
113 {
114 s3c_pm_do_restore_core(core_save, ARRAY_SIZE(core_save));
115 }
116
s3c_pm_save_core(void)117 void s3c_pm_save_core(void)
118 {
119 s3c_pm_do_save(core_save, ARRAY_SIZE(core_save));
120 }
121 #endif
122