arch/arm/mach-s3c/pm-s3c24xx.c

   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
  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
  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
 112 void s3c_pm_restore_core(void)
 113 {
 114         s3c_pm_do_restore_core(core_save, ARRAY_SIZE(core_save));
 115 }
 116
 117 void s3c_pm_save_core(void)
 118 {
 119         s3c_pm_do_save(core_save, ARRAY_SIZE(core_save));
 120 }
 121 #endif