arch/arm/mach-s5p64x0/irq-pm.c

   1 /* linux/arch/arm/mach-s5p64x0/irq-pm.c
   2  *
   3  * Copyright (c) 2011 Samsung Electronics Co., Ltd.
   4  *              http://www.samsung.com
   5  *
   6  * S5P64X0 - Interrupt handling Power Management
   7  *
   8  * Based on arch/arm/mach-s3c64xx/irq-pm.c by Ben Dooks
   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 version 2 as
  12  * published by the Free Software Foundation.
  13  */
  14
  15 #include <linux/syscore_ops.h>
  16 #include <linux/serial_core.h>
  17 #include <linux/serial_s3c.h>
  18 #include <linux/io.h>
  19
  20 #include <plat/pm.h>
  21
  22 #include <mach/regs-gpio.h>
  23
  24 static struct sleep_save irq_save[] = {
  25         SAVE_ITEM(S5P64X0_EINT0CON0),
  26         SAVE_ITEM(S5P64X0_EINT0FLTCON0),
  27         SAVE_ITEM(S5P64X0_EINT0FLTCON1),
  28         SAVE_ITEM(S5P64X0_EINT0MASK),
  29 };
  30
  31 static struct irq_grp_save {
  32         u32     con;
  33         u32     fltcon;
  34         u32     mask;
  35 } eint_grp_save[4];
  36
  37 #ifdef CONFIG_SERIAL_SAMSUNG
  38 static u32 irq_uart_mask[CONFIG_SERIAL_SAMSUNG_UARTS];
  39 #endif
  40
  41 static int s5p64x0_irq_pm_suspend(void)
  42 {
  43         struct irq_grp_save *grp = eint_grp_save;
  44         int i;
  45
  46         S3C_PMDBG("%s: suspending IRQs\n", __func__);
  47
  48         s3c_pm_do_save(irq_save, ARRAY_SIZE(irq_save));
  49
  50 #ifdef CONFIG_SERIAL_SAMSUNG
  51         for (i = 0; i < CONFIG_SERIAL_SAMSUNG_UARTS; i++)
  52                 irq_uart_mask[i] = __raw_readl(S3C_VA_UARTx(i) + S3C64XX_UINTM);
  53 #endif
  54
  55         for (i = 0; i < ARRAY_SIZE(eint_grp_save); i++, grp++) {
  56                 grp->con = __raw_readl(S5P64X0_EINT12CON + (i * 4));
  57                 grp->mask = __raw_readl(S5P64X0_EINT12MASK + (i * 4));
  58                 grp->fltcon = __raw_readl(S5P64X0_EINT12FLTCON + (i * 4));
  59         }
  60
  61         return 0;
  62 }
  63
  64 static void s5p64x0_irq_pm_resume(void)
  65 {
  66         struct irq_grp_save *grp = eint_grp_save;
  67         int i;
  68
  69         S3C_PMDBG("%s: resuming IRQs\n", __func__);
  70
  71         s3c_pm_do_restore(irq_save, ARRAY_SIZE(irq_save));
  72
  73 #ifdef CONFIG_SERIAL_SAMSUNG
  74         for (i = 0; i < CONFIG_SERIAL_SAMSUNG_UARTS; i++)
  75                 __raw_writel(irq_uart_mask[i], S3C_VA_UARTx(i) + S3C64XX_UINTM);
  76 #endif
  77
  78         for (i = 0; i < ARRAY_SIZE(eint_grp_save); i++, grp++) {
  79                 __raw_writel(grp->con, S5P64X0_EINT12CON + (i * 4));
  80                 __raw_writel(grp->mask, S5P64X0_EINT12MASK + (i * 4));
  81                 __raw_writel(grp->fltcon, S5P64X0_EINT12FLTCON + (i * 4));
  82         }
  83
  84         S3C_PMDBG("%s: IRQ configuration restored\n", __func__);
  85 }
  86
  87 static struct syscore_ops s5p64x0_irq_syscore_ops = {
  88         .suspend = s5p64x0_irq_pm_suspend,
  89         .resume  = s5p64x0_irq_pm_resume,
  90 };
  91
  92 static int __init s5p64x0_syscore_init(void)
  93 {
  94         register_syscore_ops(&s5p64x0_irq_syscore_ops);
  95
  96         return 0;
  97 }
  98 core_initcall(s5p64x0_syscore_init);