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
 36static 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
 47static 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
 59static u32 irq_uart_mask[SERIAL_SAMSUNG_UARTS];
 60
 61static 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
 82static 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
103static struct syscore_ops s3c64xx_irq_syscore_ops = {
104	.suspend = s3c64xx_irq_pm_suspend,
105	.resume	 = s3c64xx_irq_pm_resume,
106};
107
108static __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
119core_initcall(s3c64xx_syscore_init);