ARM: 7257/1: EXYNOS: introduce arch/arm/mach-exynos/common.[ch]

This patch introduces common.[ch] which are used only in the
arch/arm/mach-exynos/ directory. The common.c file merges
the cpu.c, init.c, irq-combiner.c and irq-eint.c files which
are used commonly on EXYNOS SoCs and the common.h file replaces
with plat/exynos4.h file.

Cc: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 723 insertions, 0 deletions

diff --git a/arch/arm/mach-exynos/common.c b/arch/arm/mach-exynos/common.c
new file mode 100644
index 000000000000..eecac125307a
--- /dev/null
+++ b/arch/arm/mach-exynos/common.c
@@ -0,0 +1,723 @@
+/*
+ * Copyright (c) 2010-2011 Samsung Electronics Co., Ltd.
+ *		http://www.samsung.com
+ *
+ * Common Codes for EXYNOS
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/kernel.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/io.h>
+#include <linux/sysdev.h>
+#include <linux/gpio.h>
+#include <linux/sched.h>
+#include <linux/serial_core.h>
+
+#include <asm/proc-fns.h>
+#include <asm/hardware/cache-l2x0.h>
+#include <asm/hardware/gic.h>
+#include <asm/mach/map.h>
+#include <asm/mach/irq.h>
+
+#include <mach/regs-irq.h>
+#include <mach/regs-pmu.h>
+#include <mach/regs-gpio.h>
+
+#include <plat/cpu.h>
+#include <plat/clock.h>
+#include <plat/devs.h>
+#include <plat/pm.h>
+#include <plat/reset.h>
+#include <plat/sdhci.h>
+#include <plat/gpio-cfg.h>
+#include <plat/adc-core.h>
+#include <plat/fb-core.h>
+#include <plat/fimc-core.h>
+#include <plat/iic-core.h>
+#include <plat/tv-core.h>
+#include <plat/regs-serial.h>
+
+#include "common.h"
+
+unsigned int gic_bank_offset __read_mostly;
+
+static const char name_exynos4210[] = "EXYNOS4210";
+static const char name_exynos4212[] = "EXYNOS4212";
+static const char name_exynos4412[] = "EXYNOS4412";
+
+static struct cpu_table cpu_ids[] __initdata = {
+	{
+		.idcode		= EXYNOS4210_CPU_ID,
+		.idmask		= EXYNOS4_CPU_MASK,
+		.map_io		= exynos4_map_io,
+		.init_clocks	= exynos4_init_clocks,
+		.init_uarts	= exynos4_init_uarts,
+		.init		= exynos_init,
+		.name		= name_exynos4210,
+	}, {
+		.idcode		= EXYNOS4212_CPU_ID,
+		.idmask		= EXYNOS4_CPU_MASK,
+		.map_io		= exynos4_map_io,
+		.init_clocks	= exynos4_init_clocks,
+		.init_uarts	= exynos4_init_uarts,
+		.init		= exynos_init,
+		.name		= name_exynos4212,
+	}, {
+		.idcode		= EXYNOS4412_CPU_ID,
+		.idmask		= EXYNOS4_CPU_MASK,
+		.map_io		= exynos4_map_io,
+		.init_clocks	= exynos4_init_clocks,
+		.init_uarts	= exynos4_init_uarts,
+		.init		= exynos_init,
+		.name		= name_exynos4412,
+	},
+};
+
+/* Initial IO mappings */
+
+static struct map_desc exynos_iodesc[] __initdata = {
+	{
+		.virtual	= (unsigned long)S5P_VA_CHIPID,
+		.pfn		= __phys_to_pfn(EXYNOS4_PA_CHIPID),
+		.length		= SZ_4K,
+		.type		= MT_DEVICE,
+	}, {
+		.virtual	= (unsigned long)S3C_VA_SYS,
+		.pfn		= __phys_to_pfn(EXYNOS4_PA_SYSCON),
+		.length		= SZ_64K,
+		.type		= MT_DEVICE,
+	}, {
+		.virtual	= (unsigned long)S3C_VA_TIMER,
+		.pfn		= __phys_to_pfn(EXYNOS4_PA_TIMER),
+		.length		= SZ_16K,
+		.type		= MT_DEVICE,
+	}, {
+		.virtual	= (unsigned long)S3C_VA_WATCHDOG,
+		.pfn		= __phys_to_pfn(EXYNOS4_PA_WATCHDOG),
+		.length		= SZ_4K,
+		.type		= MT_DEVICE,
+	}, {
+		.virtual	= (unsigned long)S5P_VA_SROMC,
+		.pfn		= __phys_to_pfn(EXYNOS4_PA_SROMC),
+		.length		= SZ_4K,
+		.type		= MT_DEVICE,
+	}, {
+		.virtual	= (unsigned long)S5P_VA_SYSTIMER,
+		.pfn		= __phys_to_pfn(EXYNOS4_PA_SYSTIMER),
+		.length		= SZ_4K,
+		.type		= MT_DEVICE,
+	}, {
+		.virtual	= (unsigned long)S5P_VA_PMU,
+		.pfn		= __phys_to_pfn(EXYNOS4_PA_PMU),
+		.length		= SZ_64K,
+		.type		= MT_DEVICE,
+	}, {
+		.virtual	= (unsigned long)S5P_VA_COMBINER_BASE,
+		.pfn		= __phys_to_pfn(EXYNOS4_PA_COMBINER),
+		.length		= SZ_4K,
+		.type		= MT_DEVICE,
+	}, {
+		.virtual	= (unsigned long)S5P_VA_GIC_CPU,
+		.pfn		= __phys_to_pfn(EXYNOS4_PA_GIC_CPU),
+		.length		= SZ_64K,
+		.type		= MT_DEVICE,
+	}, {
+		.virtual	= (unsigned long)S5P_VA_GIC_DIST,
+		.pfn		= __phys_to_pfn(EXYNOS4_PA_GIC_DIST),
+		.length		= SZ_64K,
+		.type		= MT_DEVICE,
+	}, {
+		.virtual	= (unsigned long)S3C_VA_UART,
+		.pfn		= __phys_to_pfn(EXYNOS4_PA_UART),
+		.length		= SZ_512K,
+		.type		= MT_DEVICE,
+	},
+};
+
+static struct map_desc exynos4_iodesc[] __initdata = {
+	{
+		.virtual	= (unsigned long)S5P_VA_CMU,
+		.pfn		= __phys_to_pfn(EXYNOS4_PA_CMU),
+		.length		= SZ_128K,
+		.type		= MT_DEVICE,
+	}, {
+		.virtual	= (unsigned long)S5P_VA_COREPERI_BASE,
+		.pfn		= __phys_to_pfn(EXYNOS4_PA_COREPERI),
+		.length		= SZ_8K,
+		.type		= MT_DEVICE,
+	}, {
+		.virtual	= (unsigned long)S5P_VA_L2CC,
+		.pfn		= __phys_to_pfn(EXYNOS4_PA_L2CC),
+		.length		= SZ_4K,
+		.type		= MT_DEVICE,
+	}, {
+		.virtual	= (unsigned long)S5P_VA_GPIO1,
+		.pfn		= __phys_to_pfn(EXYNOS4_PA_GPIO1),
+		.length		= SZ_4K,
+		.type		= MT_DEVICE,
+	}, {
+		.virtual	= (unsigned long)S5P_VA_GPIO2,
+		.pfn		= __phys_to_pfn(EXYNOS4_PA_GPIO2),
+		.length		= SZ_4K,
+		.type		= MT_DEVICE,
+	}, {
+		.virtual	= (unsigned long)S5P_VA_GPIO3,
+		.pfn		= __phys_to_pfn(EXYNOS4_PA_GPIO3),
+		.length		= SZ_256,
+		.type		= MT_DEVICE,
+	}, {
+		.virtual	= (unsigned long)S5P_VA_DMC0,
+		.pfn		= __phys_to_pfn(EXYNOS4_PA_DMC0),
+		.length		= SZ_4K,
+		.type		= MT_DEVICE,
+	}, {
+		.virtual	= (unsigned long)S5P_VA_SROMC,
+		.pfn		= __phys_to_pfn(EXYNOS4_PA_SROMC),
+		.length		= SZ_4K,
+		.type		= MT_DEVICE,
+	}, {
+		.virtual	= (unsigned long)S3C_VA_USB_HSPHY,
+		.pfn		= __phys_to_pfn(EXYNOS4_PA_HSPHY),
+		.length		= SZ_4K,
+		.type		= MT_DEVICE,
+	},
+};
+
+static struct map_desc exynos4_iodesc0[] __initdata = {
+	{
+		.virtual	= (unsigned long)S5P_VA_SYSRAM,
+		.pfn		= __phys_to_pfn(EXYNOS4_PA_SYSRAM0),
+		.length		= SZ_4K,
+		.type		= MT_DEVICE,
+	},
+};
+
+static struct map_desc exynos4_iodesc1[] __initdata = {
+	{
+		.virtual	= (unsigned long)S5P_VA_SYSRAM,
+		.pfn		= __phys_to_pfn(EXYNOS4_PA_SYSRAM1),
+		.length		= SZ_4K,
+		.type		= MT_DEVICE,
+	},
+};
+
+static void exynos_idle(void)
+{
+	if (!need_resched())
+		cpu_do_idle();
+
+	local_irq_enable();
+}
+
+static void exynos4_sw_reset(void)
+{
+	__raw_writel(0x1, S5P_SWRESET);
+}
+
+/*
+ * exynos_map_io
+ *
+ * register the standard cpu IO areas
+ */
+
+void __init exynos_init_io(struct map_desc *mach_desc, int size)
+{
+	/* initialize the io descriptors we need for initialization */
+	iotable_init(exynos_iodesc, ARRAY_SIZE(exynos_iodesc));
+	if (mach_desc)
+		iotable_init(mach_desc, size);
+
+	/* detect cpu id and rev. */
+	s5p_init_cpu(S5P_VA_CHIPID);
+
+	s3c_init_cpu(samsung_cpu_id, cpu_ids, ARRAY_SIZE(cpu_ids));
+}
+
+void __init exynos4_map_io(void)
+{
+	iotable_init(exynos4_iodesc, ARRAY_SIZE(exynos4_iodesc));
+
+	if (soc_is_exynos4210() && samsung_rev() == EXYNOS4210_REV_0)
+		iotable_init(exynos4_iodesc0, ARRAY_SIZE(exynos4_iodesc0));
+	else
+		iotable_init(exynos4_iodesc1, ARRAY_SIZE(exynos4_iodesc1));
+
+	/* initialize device information early */
+	exynos4_default_sdhci0();
+	exynos4_default_sdhci1();
+	exynos4_default_sdhci2();
+	exynos4_default_sdhci3();
+
+	s3c_adc_setname("samsung-adc-v3");
+
+	s3c_fimc_setname(0, "exynos4-fimc");
+	s3c_fimc_setname(1, "exynos4-fimc");
+	s3c_fimc_setname(2, "exynos4-fimc");
+	s3c_fimc_setname(3, "exynos4-fimc");
+
+	/* The I2C bus controllers are directly compatible with s3c2440 */
+	s3c_i2c0_setname("s3c2440-i2c");
+	s3c_i2c1_setname("s3c2440-i2c");
+	s3c_i2c2_setname("s3c2440-i2c");
+
+	s5p_fb_setname(0, "exynos4-fb");
+	s5p_hdmi_setname("exynos4-hdmi");
+}
+
+void __init exynos4_init_clocks(int xtal)
+{
+	printk(KERN_DEBUG "%s: initializing clocks\n", __func__);
+
+	s3c24xx_register_baseclocks(xtal);
+	s5p_register_clocks(xtal);
+
+	if (soc_is_exynos4210())
+		exynos4210_register_clocks();
+	else if (soc_is_exynos4212() || soc_is_exynos4412())
+		exynos4212_register_clocks();
+
+	exynos4_register_clocks();
+	exynos4_setup_clocks();
+}
+
+#define COMBINER_ENABLE_SET	0x0
+#define COMBINER_ENABLE_CLEAR	0x4
+#define COMBINER_INT_STATUS	0xC
+
+static DEFINE_SPINLOCK(irq_controller_lock);
+
+struct combiner_chip_data {
+	unsigned int irq_offset;
+	unsigned int irq_mask;
+	void __iomem *base;
+};
+
+static struct combiner_chip_data combiner_data[MAX_COMBINER_NR];
+
+static inline void __iomem *combiner_base(struct irq_data *data)
+{
+	struct combiner_chip_data *combiner_data =
+		irq_data_get_irq_chip_data(data);
+
+	return combiner_data->base;
+}
+
+static void combiner_mask_irq(struct irq_data *data)
+{
+	u32 mask = 1 << (data->irq % 32);
+
+	__raw_writel(mask, combiner_base(data) + COMBINER_ENABLE_CLEAR);
+}
+
+static void combiner_unmask_irq(struct irq_data *data)
+{
+	u32 mask = 1 << (data->irq % 32);
+
+	__raw_writel(mask, combiner_base(data) + COMBINER_ENABLE_SET);
+}
+
+static void combiner_handle_cascade_irq(unsigned int irq, struct irq_desc *desc)
+{
+	struct combiner_chip_data *chip_data = irq_get_handler_data(irq);
+	struct irq_chip *chip = irq_get_chip(irq);
+	unsigned int cascade_irq, combiner_irq;
+	unsigned long status;
+
+	chained_irq_enter(chip, desc);
+
+	spin_lock(&irq_controller_lock);
+	status = __raw_readl(chip_data->base + COMBINER_INT_STATUS);
+	spin_unlock(&irq_controller_lock);
+	status &= chip_data->irq_mask;
+
+	if (status == 0)
+		goto out;
+
+	combiner_irq = __ffs(status);
+
+	cascade_irq = combiner_irq + (chip_data->irq_offset & ~31);
+	if (unlikely(cascade_irq >= NR_IRQS))
+		do_bad_IRQ(cascade_irq, desc);
+	else
+		generic_handle_irq(cascade_irq);
+
+ out:
+	chained_irq_exit(chip, desc);
+}
+
+static struct irq_chip combiner_chip = {
+	.name		= "COMBINER",
+	.irq_mask	= combiner_mask_irq,
+	.irq_unmask	= combiner_unmask_irq,
+};
+
+static void __init combiner_cascade_irq(unsigned int combiner_nr, unsigned int irq)
+{
+	if (combiner_nr >= MAX_COMBINER_NR)
+		BUG();
+	if (irq_set_handler_data(irq, &combiner_data[combiner_nr]) != 0)
+		BUG();
+	irq_set_chained_handler(irq, combiner_handle_cascade_irq);
+}
+
+static void __init combiner_init(unsigned int combiner_nr, void __iomem *base,
+			  unsigned int irq_start)
+{
+	unsigned int i;
+
+	if (combiner_nr >= MAX_COMBINER_NR)
+		BUG();
+
+	combiner_data[combiner_nr].base = base;
+	combiner_data[combiner_nr].irq_offset = irq_start;
+	combiner_data[combiner_nr].irq_mask = 0xff << ((combiner_nr % 4) << 3);
+
+	/* Disable all interrupts */
+
+	__raw_writel(combiner_data[combiner_nr].irq_mask,
+		     base + COMBINER_ENABLE_CLEAR);
+
+	/* Setup the Linux IRQ subsystem */
+
+	for (i = irq_start; i < combiner_data[combiner_nr].irq_offset
+				+ MAX_IRQ_IN_COMBINER; i++) {
+		irq_set_chip_and_handler(i, &combiner_chip, handle_level_irq);
+		irq_set_chip_data(i, &combiner_data[combiner_nr]);
+		set_irq_flags(i, IRQF_VALID | IRQF_PROBE);
+	}
+}
+
+static void exynos4_gic_irq_fix_base(struct irq_data *d)
+{
+	struct gic_chip_data *gic_data = irq_data_get_irq_chip_data(d);
+
+	gic_data->cpu_base = S5P_VA_GIC_CPU +
+			    (gic_bank_offset * smp_processor_id());
+
+	gic_data->dist_base = S5P_VA_GIC_DIST +
+			    (gic_bank_offset * smp_processor_id());
+}
+
+void __init exynos4_init_irq(void)
+{
+	int irq;
+
+	gic_bank_offset = soc_is_exynos4412() ? 0x4000 : 0x8000;
+
+	gic_init(0, IRQ_PPI(0), S5P_VA_GIC_DIST, S5P_VA_GIC_CPU);
+	gic_arch_extn.irq_eoi = exynos4_gic_irq_fix_base;
+	gic_arch_extn.irq_unmask = exynos4_gic_irq_fix_base;
+	gic_arch_extn.irq_mask = exynos4_gic_irq_fix_base;
+
+	for (irq = 0; irq < MAX_COMBINER_NR; irq++) {
+
+		combiner_init(irq, (void __iomem *)S5P_VA_COMBINER(irq),
+				COMBINER_IRQ(irq, 0));
+		combiner_cascade_irq(irq, IRQ_SPI(irq));
+	}
+
+	/*
+	 * The parameters of s5p_init_irq() are for VIC init.
+	 * Theses parameters should be NULL and 0 because EXYNOS4
+	 * uses GIC instead of VIC.
+	 */
+	s5p_init_irq(NULL, 0);
+}
+
+struct sysdev_class exynos4_sysclass = {
+	.name	= "exynos4-core",
+};
+
+static struct sys_device exynos4_sysdev = {
+	.cls	= &exynos4_sysclass,
+};
+
+static int __init exynos4_core_init(void)
+{
+	return sysdev_class_register(&exynos4_sysclass);
+}
+core_initcall(exynos4_core_init);
+
+#ifdef CONFIG_CACHE_L2X0
+static int __init exynos4_l2x0_cache_init(void)
+{
+	/* TAG, Data Latency Control: 2cycle */
+	__raw_writel(0x110, S5P_VA_L2CC + L2X0_TAG_LATENCY_CTRL);
+
+	if (soc_is_exynos4210())
+		__raw_writel(0x110, S5P_VA_L2CC + L2X0_DATA_LATENCY_CTRL);
+	else if (soc_is_exynos4212() || soc_is_exynos4412())
+		__raw_writel(0x120, S5P_VA_L2CC + L2X0_DATA_LATENCY_CTRL);
+
+	/* L2X0 Prefetch Control */
+	__raw_writel(0x30000007, S5P_VA_L2CC + L2X0_PREFETCH_CTRL);
+
+	/* L2X0 Power Control */
+	__raw_writel(L2X0_DYNAMIC_CLK_GATING_EN | L2X0_STNDBY_MODE_EN,
+		     S5P_VA_L2CC + L2X0_POWER_CTRL);
+
+	l2x0_init(S5P_VA_L2CC, 0x7C470001, 0xC200ffff);
+
+	return 0;
+}
+
+early_initcall(exynos4_l2x0_cache_init);
+#endif
+
+int __init exynos_init(void)
+{
+	printk(KERN_INFO "EXYNOS: Initializing architecture\n");
+
+	/* set idle function */
+	pm_idle = exynos_idle;
+
+	/* set sw_reset function */
+	if (soc_is_exynos4210() || soc_is_exynos4212() || soc_is_exynos4412())
+		s5p_reset_hook = exynos4_sw_reset;
+
+	return sysdev_register(&exynos4_sysdev);
+}
+
+static struct s3c24xx_uart_clksrc exynos4_serial_clocks[] = {
+	[0] = {
+		.name		= "uclk1",
+		.divisor	= 1,
+		.min_baud	= 0,
+		.max_baud	= 0,
+	},
+};
+
+/* uart registration process */
+
+void __init exynos4_init_uarts(struct s3c2410_uartcfg *cfg, int no)
+{
+	struct s3c2410_uartcfg *tcfg = cfg;
+	u32 ucnt;
+
+	for (ucnt = 0; ucnt < no; ucnt++, tcfg++) {
+		if (!tcfg->clocks) {
+			tcfg->has_fracval = 1;
+			tcfg->clocks = exynos4_serial_clocks;
+			tcfg->clocks_size = ARRAY_SIZE(exynos4_serial_clocks);
+		}
+		tcfg->flags |= NO_NEED_CHECK_CLKSRC;
+	}
+
+	s3c24xx_init_uartdevs("s5pv210-uart", s5p_uart_resources, cfg, no);
+}
+
+static DEFINE_SPINLOCK(eint_lock);
+
+static unsigned int eint0_15_data[16];
+
+static unsigned int exynos4_get_irq_nr(unsigned int number)
+{
+	u32 ret = 0;
+
+	switch (number) {
+	case 0 ... 3:
+		ret = (number + IRQ_EINT0);
+		break;
+	case 4 ... 7:
+		ret = (number + (IRQ_EINT4 - 4));
+		break;
+	case 8 ... 15:
+		ret = (number + (IRQ_EINT8 - 8));
+		break;
+	default:
+		printk(KERN_ERR "number available : %d\n", number);
+	}
+
+	return ret;
+}
+
+static inline void exynos4_irq_eint_mask(struct irq_data *data)
+{
+	u32 mask;
+
+	spin_lock(&eint_lock);
+	mask = __raw_readl(S5P_EINT_MASK(EINT_REG_NR(data->irq)));
+	mask |= eint_irq_to_bit(data->irq);
+	__raw_writel(mask, S5P_EINT_MASK(EINT_REG_NR(data->irq)));
+	spin_unlock(&eint_lock);
+}
+
+static void exynos4_irq_eint_unmask(struct irq_data *data)
+{
+	u32 mask;
+
+	spin_lock(&eint_lock);
+	mask = __raw_readl(S5P_EINT_MASK(EINT_REG_NR(data->irq)));
+	mask &= ~(eint_irq_to_bit(data->irq));
+	__raw_writel(mask, S5P_EINT_MASK(EINT_REG_NR(data->irq)));
+	spin_unlock(&eint_lock);
+}
+
+static inline void exynos4_irq_eint_ack(struct irq_data *data)
+{
+	__raw_writel(eint_irq_to_bit(data->irq),
+		     S5P_EINT_PEND(EINT_REG_NR(data->irq)));
+}
+
+static void exynos4_irq_eint_maskack(struct irq_data *data)
+{
+	exynos4_irq_eint_mask(data);
+	exynos4_irq_eint_ack(data);
+}
+
+static int exynos4_irq_eint_set_type(struct irq_data *data, unsigned int type)
+{
+	int offs = EINT_OFFSET(data->irq);
+	int shift;
+	u32 ctrl, mask;
+	u32 newvalue = 0;
+
+	switch (type) {
+	case IRQ_TYPE_EDGE_RISING:
+		newvalue = S5P_IRQ_TYPE_EDGE_RISING;
+		break;
+
+	case IRQ_TYPE_EDGE_FALLING:
+		newvalue = S5P_IRQ_TYPE_EDGE_FALLING;
+		break;
+
+	case IRQ_TYPE_EDGE_BOTH:
+		newvalue = S5P_IRQ_TYPE_EDGE_BOTH;
+		break;
+
+	case IRQ_TYPE_LEVEL_LOW:
+		newvalue = S5P_IRQ_TYPE_LEVEL_LOW;
+		break;
+
+	case IRQ_TYPE_LEVEL_HIGH:
+		newvalue = S5P_IRQ_TYPE_LEVEL_HIGH;
+		break;
+
+	default:
+		printk(KERN_ERR "No such irq type %d", type);
+		return -EINVAL;
+	}
+
+	shift = (offs & 0x7) * 4;
+	mask = 0x7 << shift;
+
+	spin_lock(&eint_lock);
+	ctrl = __raw_readl(S5P_EINT_CON(EINT_REG_NR(data->irq)));
+	ctrl &= ~mask;
+	ctrl |= newvalue << shift;
+	__raw_writel(ctrl, S5P_EINT_CON(EINT_REG_NR(data->irq)));
+	spin_unlock(&eint_lock);
+
+	switch (offs) {
+	case 0 ... 7:
+		s3c_gpio_cfgpin(EINT_GPIO_0(offs & 0x7), EINT_MODE);
+		break;
+	case 8 ... 15:
+		s3c_gpio_cfgpin(EINT_GPIO_1(offs & 0x7), EINT_MODE);
+		break;
+	case 16 ... 23:
+		s3c_gpio_cfgpin(EINT_GPIO_2(offs & 0x7), EINT_MODE);
+		break;
+	case 24 ... 31:
+		s3c_gpio_cfgpin(EINT_GPIO_3(offs & 0x7), EINT_MODE);
+		break;
+	default:
+		printk(KERN_ERR "No such irq number %d", offs);
+	}
+
+	return 0;
+}
+
+static struct irq_chip exynos4_irq_eint = {
+	.name		= "exynos4-eint",
+	.irq_mask	= exynos4_irq_eint_mask,
+	.irq_unmask	= exynos4_irq_eint_unmask,
+	.irq_mask_ack	= exynos4_irq_eint_maskack,
+	.irq_ack	= exynos4_irq_eint_ack,
+	.irq_set_type	= exynos4_irq_eint_set_type,
+#ifdef CONFIG_PM
+	.irq_set_wake	= s3c_irqext_wake,
+#endif
+};
+
+/*
+ * exynos4_irq_demux_eint
+ *
+ * This function demuxes the IRQ from from EINTs 16 to 31.
+ * It is designed to be inlined into the specific handler
+ * s5p_irq_demux_eintX_Y.
+ *
+ * Each EINT pend/mask registers handle eight of them.
+ */
+static inline void exynos4_irq_demux_eint(unsigned int start)
+{
+	unsigned int irq;
+
+	u32 status = __raw_readl(S5P_EINT_PEND(EINT_REG_NR(start)));
+	u32 mask = __raw_readl(S5P_EINT_MASK(EINT_REG_NR(start)));
+
+	status &= ~mask;
+	status &= 0xff;
+
+	while (status) {
+		irq = fls(status) - 1;
+		generic_handle_irq(irq + start);
+		status &= ~(1 << irq);
+	}
+}
+
+static void exynos4_irq_demux_eint16_31(unsigned int irq, struct irq_desc *desc)
+{
+	struct irq_chip *chip = irq_get_chip(irq);
+	chained_irq_enter(chip, desc);
+	exynos4_irq_demux_eint(IRQ_EINT(16));
+	exynos4_irq_demux_eint(IRQ_EINT(24));
+	chained_irq_exit(chip, desc);
+}
+
+static void exynos4_irq_eint0_15(unsigned int irq, struct irq_desc *desc)
+{
+	u32 *irq_data = irq_get_handler_data(irq);
+	struct irq_chip *chip = irq_get_chip(irq);
+
+	chained_irq_enter(chip, desc);
+	chip->irq_mask(&desc->irq_data);
+
+	if (chip->irq_ack)
+		chip->irq_ack(&desc->irq_data);
+
+	generic_handle_irq(*irq_data);
+
+	chip->irq_unmask(&desc->irq_data);
+	chained_irq_exit(chip, desc);
+}
+
+int __init exynos4_init_irq_eint(void)
+{
+	int irq;
+
+	for (irq = 0 ; irq <= 31 ; irq++) {
+		irq_set_chip_and_handler(IRQ_EINT(irq), &exynos4_irq_eint,
+					 handle_level_irq);
+		set_irq_flags(IRQ_EINT(irq), IRQF_VALID);
+	}
+
+	irq_set_chained_handler(IRQ_EINT16_31, exynos4_irq_demux_eint16_31);
+
+	for (irq = 0 ; irq <= 15 ; irq++) {
+		eint0_15_data[irq] = IRQ_EINT(irq);
+
+		irq_set_handler_data(exynos4_get_irq_nr(irq),
+				     &eint0_15_data[irq]);
+		irq_set_chained_handler(exynos4_get_irq_nr(irq),
+					exynos4_irq_eint0_15);
+	}
+
+	return 0;
+}
+arch_initcall(exynos4_init_irq_eint);