arch/arm/mach-s3c/irq-pm-s3c64xx.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 //
   3 // Copyright 2008 Openmoko, Inc.
   4 // Copyright 2008 Simtec Electronics
   5 //      Ben Dooks <ben@simtec.co.uk>
   6 //      http://armlinux.simtec.co.uk/
   7 //
   8 // S3C64XX - Interrupt handling Power Management
   9
  10 /*
  11  * NOTE: Code in this file is not used when booting with Device Tree support.
  12  */
  13
  14 #include <linux/kernel.h>
  15 #include <linux/syscore_ops.h>
  16 #include <linux/interrupt.h>
  17 #include <linux/serial_core.h>
  18 #include <linux/serial_s3c.h>
  19 #include <linux/irq.h>
  20 #include <linux/io.h>
  21 #include <linux/of.h>
  22
  23 #include "map.h"
  24
  25 #include "regs-gpio.h"
  26 #include "cpu.h"
  27 #include "pm.h"
  28
  29 /* We handled all the IRQ types in this code, to save having to make several
  30  * small files to handle each different type separately. Having the EINT_GRP
  31  * code here shouldn't be as much bloat as the IRQ table space needed when
  32  * they are enabled. The added benefit is we ensure that these registers are
  33  * in the same state as we suspended.
  34  */
  35
  36 static struct sleep_save irq_save[] = {
  37         SAVE_ITEM(S3C64XX_PRIORITY),
  38         SAVE_ITEM(S3C64XX_EINT0CON0),
  39         SAVE_ITEM(S3C64XX_EINT0CON1),
  40         SAVE_ITEM(S3C64XX_EINT0FLTCON0),
  41         SAVE_ITEM(S3C64XX_EINT0FLTCON1),
  42         SAVE_ITEM(S3C64XX_EINT0FLTCON2),
  43         SAVE_ITEM(S3C64XX_EINT0FLTCON3),
  44         SAVE_ITEM(S3C64XX_EINT0MASK),
  45 };
  46
  47 static struct irq_grp_save {
  48         u32     fltcon;
  49         u32     con;
  50         u32     mask;
  51 } eint_grp_save[5];
  52
  53 #ifndef CONFIG_SERIAL_SAMSUNG_UARTS
  54 #define SERIAL_SAMSUNG_UARTS 0
  55 #else
  56 #define SERIAL_SAMSUNG_UARTS CONFIG_SERIAL_SAMSUNG_UARTS
  57 #endif
  58
  59 static u32 irq_uart_mask[SERIAL_SAMSUNG_UARTS];
  60
  61 static int s3c64xx_irq_pm_suspend(void)
  62 {
  63         struct irq_grp_save *grp = eint_grp_save;
  64         int i;
  65
  66         S3C_PMDBG("%s: suspending IRQs\n", __func__);
  67
  68         s3c_pm_do_save(irq_save, ARRAY_SIZE(irq_save));
  69
  70         for (i = 0; i < SERIAL_SAMSUNG_UARTS; i++)
  71                 irq_uart_mask[i] = __raw_readl(S3C_VA_UARTx(i) + S3C64XX_UINTM);
  72
  73         for (i = 0; i < ARRAY_SIZE(eint_grp_save); i++, grp++) {
  74                 grp->con = __raw_readl(S3C64XX_EINT12CON + (i * 4));
  75                 grp->mask = __raw_readl(S3C64XX_EINT12MASK + (i * 4));
  76                 grp->fltcon = __raw_readl(S3C64XX_EINT12FLTCON + (i * 4));
  77         }
  78
  79         return 0;
  80 }
  81
  82 static void s3c64xx_irq_pm_resume(void)
  83 {
  84         struct irq_grp_save *grp = eint_grp_save;
  85         int i;
  86
  87         S3C_PMDBG("%s: resuming IRQs\n", __func__);
  88
  89         s3c_pm_do_restore(irq_save, ARRAY_SIZE(irq_save));
  90
  91         for (i = 0; i < SERIAL_SAMSUNG_UARTS; i++)
  92                 __raw_writel(irq_uart_mask[i], S3C_VA_UARTx(i) + S3C64XX_UINTM);
  93
  94         for (i = 0; i < ARRAY_SIZE(eint_grp_save); i++, grp++) {
  95                 __raw_writel(grp->con, S3C64XX_EINT12CON + (i * 4));
  96                 __raw_writel(grp->mask, S3C64XX_EINT12MASK + (i * 4));
  97                 __raw_writel(grp->fltcon, S3C64XX_EINT12FLTCON + (i * 4));
  98         }
  99
 100         S3C_PMDBG("%s: IRQ configuration restored\n", __func__);
 101 }
 102
 103 static struct syscore_ops s3c64xx_irq_syscore_ops = {
 104         .suspend = s3c64xx_irq_pm_suspend,
 105         .resume  = s3c64xx_irq_pm_resume,
 106 };
 107
 108 static __init int s3c64xx_syscore_init(void)
 109 {
 110         /* Appropriate drivers (pinctrl, uart) handle this when using DT. */
 111         if (of_have_populated_dt() || !soc_is_s3c64xx())
 112                 return 0;
 113
 114         register_syscore_ops(&s3c64xx_irq_syscore_ops);
 115
 116         return 0;
 117 }
 118
 119 core_initcall(s3c64xx_syscore_init);