Merge branch 'restart' into for-linus

Conflicts:
	arch/arm/mach-exynos/cpu.c

The changes to arch/arm/mach-exynos/cpu.c were moved to
mach-exynos/common.c.

1 files changed, 713 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..d2acb0f948c6
--- /dev/null
+++ b/arch/arm/mach-exynos/common.c
@@ -0,0 +1,713 @@
+/*
+ * 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/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)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();
+}
+
+void exynos4_restart(char mode, const char *cmd)
+{
+        __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;
+
+        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);