1 files changed, 801 insertions, 0 deletions

diff --git a/arch/arm/plat-s3c24xx/irq.c b/arch/arm/plat-s3c24xx/irq.c
new file mode 100644
index 000000000000..ce186398e3fd
--- /dev/null
+++ b/arch/arm/plat-s3c24xx/irq.c
@@ -0,0 +1,801 @@
+/* linux/arch/arm/plat-s3c24xx/irq.c
+ *
+ * Copyright (c) 2003,2004 Simtec Electronics
+ *      Ben Dooks <ben@simtec.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ * Changelog:
+ *
+ *   22-Jul-2004  Ben Dooks <ben@simtec.co.uk>
+ *                Fixed compile warnings
+ *
+ *   22-Jul-2004  Roc Wu <cooloney@yahoo.com.cn>
+ *                Fixed s3c_extirq_type
+ *
+ *   21-Jul-2004  Arnaud Patard (Rtp) <arnaud.patard@rtp-net.org>
+ *                Addition of ADC/TC demux
+ *
+ *   04-Oct-2004  Klaus Fetscher <k.fetscher@fetron.de>
+ *                Fix for set_irq_type() on low EINT numbers
+ *
+ *   05-Oct-2004  Ben Dooks <ben@simtec.co.uk>
+ *                Tidy up KF's patch and sort out new release
+ *
+ *   05-Oct-2004  Ben Dooks <ben@simtec.co.uk>
+ *                Add support for power management controls
+ *
+ *   04-Nov-2004  Ben Dooks
+ *                Fix standard IRQ wake for EINT0..4 and RTC
+ *
+ *   22-Feb-2005  Ben Dooks
+ *                Fixed edge-triggering on ADC IRQ
+ *
+ *   28-Jun-2005  Ben Dooks
+ *                Mark IRQ_LCD valid
+ *
+ *   25-Jul-2005  Ben Dooks
+ *                Split the S3C2440 IRQ code to seperate file
+*/
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/ioport.h>
+#include <linux/ptrace.h>
+#include <linux/sysdev.h>
+
+#include <asm/hardware.h>
+#include <asm/irq.h>
+#include <asm/io.h>
+
+#include <asm/mach/irq.h>
+
+#include <asm/arch/regs-irq.h>
+#include <asm/arch/regs-gpio.h>
+
+#include <asm/plat-s3c24xx/cpu.h>
+#include <asm/plat-s3c24xx/pm.h>
+#include <asm/plat-s3c24xx/irq.h>
+
+/* wakeup irq control */
+
+#ifdef CONFIG_PM
+
+/* state for IRQs over sleep */
+
+/* default is to allow for EINT0..EINT15, and IRQ_RTC as wakeup sources
+ *
+ * set bit to 1 in allow bitfield to enable the wakeup settings on it
+*/
+
+unsigned long s3c_irqwake_intallow      = 1L << (IRQ_RTC - IRQ_EINT0) | 0xfL;
+unsigned long s3c_irqwake_intmask       = 0xffffffffL;
+unsigned long s3c_irqwake_eintallow     = 0x0000fff0L;
+unsigned long s3c_irqwake_eintmask      = 0xffffffffL;
+
+int
+s3c_irq_wake(unsigned int irqno, unsigned int state)
+{
+        unsigned long irqbit = 1 << (irqno - IRQ_EINT0);
+
+        if (!(s3c_irqwake_intallow & irqbit))
+                return -ENOENT;
+
+        printk(KERN_INFO "wake %s for irq %d\n",
+               state ? "enabled" : "disabled", irqno);
+
+        if (!state)
+                s3c_irqwake_intmask |= irqbit;
+        else
+                s3c_irqwake_intmask &= ~irqbit;
+
+        return 0;
+}
+
+static int
+s3c_irqext_wake(unsigned int irqno, unsigned int state)
+{
+        unsigned long bit = 1L << (irqno - EXTINT_OFF);
+
+        if (!(s3c_irqwake_eintallow & bit))
+                return -ENOENT;
+
+        printk(KERN_INFO "wake %s for irq %d\n",
+               state ? "enabled" : "disabled", irqno);
+
+        if (!state)
+                s3c_irqwake_eintmask |= bit;
+        else
+                s3c_irqwake_eintmask &= ~bit;
+
+        return 0;
+}
+
+#else
+#define s3c_irqext_wake NULL
+#define s3c_irq_wake NULL
+#endif
+
+
+static void
+s3c_irq_mask(unsigned int irqno)
+{
+        unsigned long mask;
+
+        irqno -= IRQ_EINT0;
+
+        mask = __raw_readl(S3C2410_INTMSK);
+        mask |= 1UL << irqno;
+        __raw_writel(mask, S3C2410_INTMSK);
+}
+
+static inline void
+s3c_irq_ack(unsigned int irqno)
+{
+        unsigned long bitval = 1UL << (irqno - IRQ_EINT0);
+
+        __raw_writel(bitval, S3C2410_SRCPND);
+        __raw_writel(bitval, S3C2410_INTPND);
+}
+
+static inline void
+s3c_irq_maskack(unsigned int irqno)
+{
+        unsigned long bitval = 1UL << (irqno - IRQ_EINT0);
+        unsigned long mask;
+
+        mask = __raw_readl(S3C2410_INTMSK);
+        __raw_writel(mask|bitval, S3C2410_INTMSK);
+
+        __raw_writel(bitval, S3C2410_SRCPND);
+        __raw_writel(bitval, S3C2410_INTPND);
+}
+
+
+static void
+s3c_irq_unmask(unsigned int irqno)
+{
+        unsigned long mask;
+
+        if (irqno != IRQ_TIMER4 && irqno != IRQ_EINT8t23)
+                irqdbf2("s3c_irq_unmask %d\n", irqno);
+
+        irqno -= IRQ_EINT0;
+
+        mask = __raw_readl(S3C2410_INTMSK);
+        mask &= ~(1UL << irqno);
+        __raw_writel(mask, S3C2410_INTMSK);
+}
+
+struct irq_chip s3c_irq_level_chip = {
+        .name           = "s3c-level",
+        .ack            = s3c_irq_maskack,
+        .mask           = s3c_irq_mask,
+        .unmask         = s3c_irq_unmask,
+        .set_wake       = s3c_irq_wake
+};
+
+static struct irq_chip s3c_irq_chip = {
+        .name           = "s3c",
+        .ack            = s3c_irq_ack,
+        .mask           = s3c_irq_mask,
+        .unmask         = s3c_irq_unmask,
+        .set_wake       = s3c_irq_wake
+};
+
+static void
+s3c_irqext_mask(unsigned int irqno)
+{
+        unsigned long mask;
+
+        irqno -= EXTINT_OFF;
+
+        mask = __raw_readl(S3C24XX_EINTMASK);
+        mask |= ( 1UL << irqno);
+        __raw_writel(mask, S3C24XX_EINTMASK);
+}
+
+static void
+s3c_irqext_ack(unsigned int irqno)
+{
+        unsigned long req;
+        unsigned long bit;
+        unsigned long mask;
+
+        bit = 1UL << (irqno - EXTINT_OFF);
+
+        mask = __raw_readl(S3C24XX_EINTMASK);
+
+        __raw_writel(bit, S3C24XX_EINTPEND);
+
+        req = __raw_readl(S3C24XX_EINTPEND);
+        req &= ~mask;
+
+        /* not sure if we should be acking the parent irq... */
+
+        if (irqno <= IRQ_EINT7 ) {
+                if ((req & 0xf0) == 0)
+                        s3c_irq_ack(IRQ_EINT4t7);
+        } else {
+                if ((req >> 8) == 0)
+                        s3c_irq_ack(IRQ_EINT8t23);
+        }
+}
+
+static void
+s3c_irqext_unmask(unsigned int irqno)
+{
+        unsigned long mask;
+
+        irqno -= EXTINT_OFF;
+
+        mask = __raw_readl(S3C24XX_EINTMASK);
+        mask &= ~( 1UL << irqno);
+        __raw_writel(mask, S3C24XX_EINTMASK);
+}
+
+int
+s3c_irqext_type(unsigned int irq, unsigned int type)
+{
+        void __iomem *extint_reg;
+        void __iomem *gpcon_reg;
+        unsigned long gpcon_offset, extint_offset;
+        unsigned long newvalue = 0, value;
+
+        if ((irq >= IRQ_EINT0) && (irq <= IRQ_EINT3))
+        {
+                gpcon_reg = S3C2410_GPFCON;
+                extint_reg = S3C24XX_EXTINT0;
+                gpcon_offset = (irq - IRQ_EINT0) * 2;
+                extint_offset = (irq - IRQ_EINT0) * 4;
+        }
+        else if ((irq >= IRQ_EINT4) && (irq <= IRQ_EINT7))
+        {
+                gpcon_reg = S3C2410_GPFCON;
+                extint_reg = S3C24XX_EXTINT0;
+                gpcon_offset = (irq - (EXTINT_OFF)) * 2;
+                extint_offset = (irq - (EXTINT_OFF)) * 4;
+        }
+        else if ((irq >= IRQ_EINT8) && (irq <= IRQ_EINT15))
+        {
+                gpcon_reg = S3C2410_GPGCON;
+                extint_reg = S3C24XX_EXTINT1;
+                gpcon_offset = (irq - IRQ_EINT8) * 2;
+                extint_offset = (irq - IRQ_EINT8) * 4;
+        }
+        else if ((irq >= IRQ_EINT16) && (irq <= IRQ_EINT23))
+        {
+                gpcon_reg = S3C2410_GPGCON;
+                extint_reg = S3C24XX_EXTINT2;
+                gpcon_offset = (irq - IRQ_EINT8) * 2;
+                extint_offset = (irq - IRQ_EINT16) * 4;
+        } else
+                return -1;
+
+        /* Set the GPIO to external interrupt mode */
+        value = __raw_readl(gpcon_reg);
+        value = (value & ~(3 << gpcon_offset)) | (0x02 << gpcon_offset);
+        __raw_writel(value, gpcon_reg);
+
+        /* Set the external interrupt to pointed trigger type */
+        switch (type)
+        {
+                case IRQT_NOEDGE:
+                        printk(KERN_WARNING "No edge setting!\n");
+                        break;
+
+                case IRQT_RISING:
+                        newvalue = S3C2410_EXTINT_RISEEDGE;
+                        break;
+
+                case IRQT_FALLING:
+                        newvalue = S3C2410_EXTINT_FALLEDGE;
+                        break;
+
+                case IRQT_BOTHEDGE:
+                        newvalue = S3C2410_EXTINT_BOTHEDGE;
+                        break;
+
+                case IRQT_LOW:
+                        newvalue = S3C2410_EXTINT_LOWLEV;
+                        break;
+
+                case IRQT_HIGH:
+                        newvalue = S3C2410_EXTINT_HILEV;
+                        break;
+
+                default:
+                        printk(KERN_ERR "No such irq type %d", type);
+                        return -1;
+        }
+
+        value = __raw_readl(extint_reg);
+        value = (value & ~(7 << extint_offset)) | (newvalue << extint_offset);
+        __raw_writel(value, extint_reg);
+
+        return 0;
+}
+
+static struct irq_chip s3c_irqext_chip = {
+        .name           = "s3c-ext",
+        .mask           = s3c_irqext_mask,
+        .unmask         = s3c_irqext_unmask,
+        .ack            = s3c_irqext_ack,
+        .set_type       = s3c_irqext_type,
+        .set_wake       = s3c_irqext_wake
+};
+
+static struct irq_chip s3c_irq_eint0t4 = {
+        .name           = "s3c-ext0",
+        .ack            = s3c_irq_ack,
+        .mask           = s3c_irq_mask,
+        .unmask         = s3c_irq_unmask,
+        .set_wake       = s3c_irq_wake,
+        .set_type       = s3c_irqext_type,
+};
+
+/* mask values for the parent registers for each of the interrupt types */
+
+#define INTMSK_UART0     (1UL << (IRQ_UART0 - IRQ_EINT0))
+#define INTMSK_UART1     (1UL << (IRQ_UART1 - IRQ_EINT0))
+#define INTMSK_UART2     (1UL << (IRQ_UART2 - IRQ_EINT0))
+#define INTMSK_ADCPARENT (1UL << (IRQ_ADCPARENT - IRQ_EINT0))
+
+
+/* UART0 */
+
+static void
+s3c_irq_uart0_mask(unsigned int irqno)
+{
+        s3c_irqsub_mask(irqno, INTMSK_UART0, 7);
+}
+
+static void
+s3c_irq_uart0_unmask(unsigned int irqno)
+{
+        s3c_irqsub_unmask(irqno, INTMSK_UART0);
+}
+
+static void
+s3c_irq_uart0_ack(unsigned int irqno)
+{
+        s3c_irqsub_maskack(irqno, INTMSK_UART0, 7);
+}
+
+static struct irq_chip s3c_irq_uart0 = {
+        .name           = "s3c-uart0",
+        .mask           = s3c_irq_uart0_mask,
+        .unmask         = s3c_irq_uart0_unmask,
+        .ack            = s3c_irq_uart0_ack,
+};
+
+/* UART1 */
+
+static void
+s3c_irq_uart1_mask(unsigned int irqno)
+{
+        s3c_irqsub_mask(irqno, INTMSK_UART1, 7 << 3);
+}
+
+static void
+s3c_irq_uart1_unmask(unsigned int irqno)
+{
+        s3c_irqsub_unmask(irqno, INTMSK_UART1);
+}
+
+static void
+s3c_irq_uart1_ack(unsigned int irqno)
+{
+        s3c_irqsub_maskack(irqno, INTMSK_UART1, 7 << 3);
+}
+
+static struct irq_chip s3c_irq_uart1 = {
+        .name           = "s3c-uart1",
+        .mask           = s3c_irq_uart1_mask,
+        .unmask         = s3c_irq_uart1_unmask,
+        .ack            = s3c_irq_uart1_ack,
+};
+
+/* UART2 */
+
+static void
+s3c_irq_uart2_mask(unsigned int irqno)
+{
+        s3c_irqsub_mask(irqno, INTMSK_UART2, 7 << 6);
+}
+
+static void
+s3c_irq_uart2_unmask(unsigned int irqno)
+{
+        s3c_irqsub_unmask(irqno, INTMSK_UART2);
+}
+
+static void
+s3c_irq_uart2_ack(unsigned int irqno)
+{
+        s3c_irqsub_maskack(irqno, INTMSK_UART2, 7 << 6);
+}
+
+static struct irq_chip s3c_irq_uart2 = {
+        .name           = "s3c-uart2",
+        .mask           = s3c_irq_uart2_mask,
+        .unmask         = s3c_irq_uart2_unmask,
+        .ack            = s3c_irq_uart2_ack,
+};
+
+/* ADC and Touchscreen */
+
+static void
+s3c_irq_adc_mask(unsigned int irqno)
+{
+        s3c_irqsub_mask(irqno, INTMSK_ADCPARENT, 3 << 9);
+}
+
+static void
+s3c_irq_adc_unmask(unsigned int irqno)
+{
+        s3c_irqsub_unmask(irqno, INTMSK_ADCPARENT);
+}
+
+static void
+s3c_irq_adc_ack(unsigned int irqno)
+{
+        s3c_irqsub_ack(irqno, INTMSK_ADCPARENT, 3 << 9);
+}
+
+static struct irq_chip s3c_irq_adc = {
+        .name           = "s3c-adc",
+        .mask           = s3c_irq_adc_mask,
+        .unmask         = s3c_irq_adc_unmask,
+        .ack            = s3c_irq_adc_ack,
+};
+
+/* irq demux for adc */
+static void s3c_irq_demux_adc(unsigned int irq,
+                              struct irq_desc *desc)
+{
+        unsigned int subsrc, submsk;
+        unsigned int offset = 9;
+        struct irq_desc *mydesc;
+
+        /* read the current pending interrupts, and the mask
+         * for what it is available */
+
+        subsrc = __raw_readl(S3C2410_SUBSRCPND);
+        submsk = __raw_readl(S3C2410_INTSUBMSK);
+
+        subsrc &= ~submsk;
+        subsrc >>= offset;
+        subsrc &= 3;
+
+        if (subsrc != 0) {
+                if (subsrc & 1) {
+                        mydesc = irq_desc + IRQ_TC;
+                        desc_handle_irq(IRQ_TC, mydesc);
+                }
+                if (subsrc & 2) {
+                        mydesc = irq_desc + IRQ_ADC;
+                        desc_handle_irq(IRQ_ADC, mydesc);
+                }
+        }
+}
+
+static void s3c_irq_demux_uart(unsigned int start)
+{
+        unsigned int subsrc, submsk;
+        unsigned int offset = start - IRQ_S3CUART_RX0;
+        struct irq_desc *desc;
+
+        /* read the current pending interrupts, and the mask
+         * for what it is available */
+
+        subsrc = __raw_readl(S3C2410_SUBSRCPND);
+        submsk = __raw_readl(S3C2410_INTSUBMSK);
+
+        irqdbf2("s3c_irq_demux_uart: start=%d (%d), subsrc=0x%08x,0x%08x\n",
+                start, offset, subsrc, submsk);
+
+        subsrc &= ~submsk;
+        subsrc >>= offset;
+        subsrc &= 7;
+
+        if (subsrc != 0) {
+                desc = irq_desc + start;
+
+                if (subsrc & 1)
+                        desc_handle_irq(start, desc);
+
+                desc++;
+
+                if (subsrc & 2)
+                        desc_handle_irq(start+1, desc);
+
+                desc++;
+
+                if (subsrc & 4)
+                        desc_handle_irq(start+2, desc);
+        }
+}
+
+/* uart demux entry points */
+
+static void
+s3c_irq_demux_uart0(unsigned int irq,
+                    struct irq_desc *desc)
+{
+        irq = irq;
+        s3c_irq_demux_uart(IRQ_S3CUART_RX0);
+}
+
+static void
+s3c_irq_demux_uart1(unsigned int irq,
+                    struct irq_desc *desc)
+{
+        irq = irq;
+        s3c_irq_demux_uart(IRQ_S3CUART_RX1);
+}
+
+static void
+s3c_irq_demux_uart2(unsigned int irq,
+                    struct irq_desc *desc)
+{
+        irq = irq;
+        s3c_irq_demux_uart(IRQ_S3CUART_RX2);
+}
+
+static void
+s3c_irq_demux_extint8(unsigned int irq,
+                      struct irq_desc *desc)
+{
+        unsigned long eintpnd = __raw_readl(S3C24XX_EINTPEND);
+        unsigned long eintmsk = __raw_readl(S3C24XX_EINTMASK);
+
+        eintpnd &= ~eintmsk;
+        eintpnd &= ~0xff;       /* ignore lower irqs */
+
+        /* we may as well handle all the pending IRQs here */
+
+        while (eintpnd) {
+                irq = __ffs(eintpnd);
+                eintpnd &= ~(1<<irq);
+
+                irq += (IRQ_EINT4 - 4);
+                desc_handle_irq(irq, irq_desc + irq);
+        }
+
+}
+
+static void
+s3c_irq_demux_extint4t7(unsigned int irq,
+                        struct irq_desc *desc)
+{
+        unsigned long eintpnd = __raw_readl(S3C24XX_EINTPEND);
+        unsigned long eintmsk = __raw_readl(S3C24XX_EINTMASK);
+
+        eintpnd &= ~eintmsk;
+        eintpnd &= 0xff;        /* only lower irqs */
+
+        /* we may as well handle all the pending IRQs here */
+
+        while (eintpnd) {
+                irq = __ffs(eintpnd);
+                eintpnd &= ~(1<<irq);
+
+                irq += (IRQ_EINT4 - 4);
+
+                desc_handle_irq(irq, irq_desc + irq);
+        }
+}
+
+#ifdef CONFIG_PM
+
+static struct sleep_save irq_save[] = {
+        SAVE_ITEM(S3C2410_INTMSK),
+        SAVE_ITEM(S3C2410_INTSUBMSK),
+};
+
+/* the extint values move between the s3c2410/s3c2440 and the s3c2412
+ * so we use an array to hold them, and to calculate the address of
+ * the register at run-time
+*/
+
+static unsigned long save_extint[3];
+static unsigned long save_eintflt[4];
+static unsigned long save_eintmask;
+
+int s3c24xx_irq_suspend(struct sys_device *dev, pm_message_t state)
+{
+        unsigned int i;
+
+        for (i = 0; i < ARRAY_SIZE(save_extint); i++)
+                save_extint[i] = __raw_readl(S3C24XX_EXTINT0 + (i*4));
+
+        for (i = 0; i < ARRAY_SIZE(save_eintflt); i++)
+                save_eintflt[i] = __raw_readl(S3C24XX_EINFLT0 + (i*4));
+
+        s3c2410_pm_do_save(irq_save, ARRAY_SIZE(irq_save));
+        save_eintmask = __raw_readl(S3C24XX_EINTMASK);
+
+        return 0;
+}
+
+int s3c24xx_irq_resume(struct sys_device *dev)
+{
+        unsigned int i;
+
+        for (i = 0; i < ARRAY_SIZE(save_extint); i++)
+                __raw_writel(save_extint[i], S3C24XX_EXTINT0 + (i*4));
+
+        for (i = 0; i < ARRAY_SIZE(save_eintflt); i++)
+                __raw_writel(save_eintflt[i], S3C24XX_EINFLT0 + (i*4));
+
+        s3c2410_pm_do_restore(irq_save, ARRAY_SIZE(irq_save));
+        __raw_writel(save_eintmask, S3C24XX_EINTMASK);
+
+        return 0;
+}
+
+#else
+#define s3c24xx_irq_suspend NULL
+#define s3c24xx_irq_resume  NULL
+#endif
+
+/* s3c24xx_init_irq
+ *
+ * Initialise S3C2410 IRQ system
+*/
+
+void __init s3c24xx_init_irq(void)
+{
+        unsigned long pend;
+        unsigned long last;
+        int irqno;
+        int i;
+
+        irqdbf("s3c2410_init_irq: clearing interrupt status flags\n");
+
+        /* first, clear all interrupts pending... */
+
+        last = 0;
+        for (i = 0; i < 4; i++) {
+                pend = __raw_readl(S3C24XX_EINTPEND);
+
+                if (pend == 0 || pend == last)
+                        break;
+
+                __raw_writel(pend, S3C24XX_EINTPEND);
+                printk("irq: clearing pending ext status %08x\n", (int)pend);
+                last = pend;
+        }
+
+        last = 0;
+        for (i = 0; i < 4; i++) {
+                pend = __raw_readl(S3C2410_INTPND);
+
+                if (pend == 0 || pend == last)
+                        break;
+
+                __raw_writel(pend, S3C2410_SRCPND);
+                __raw_writel(pend, S3C2410_INTPND);
+                printk("irq: clearing pending status %08x\n", (int)pend);
+                last = pend;
+        }
+
+        last = 0;
+        for (i = 0; i < 4; i++) {
+                pend = __raw_readl(S3C2410_SUBSRCPND);
+
+                if (pend == 0 || pend == last)
+                        break;
+
+                printk("irq: clearing subpending status %08x\n", (int)pend);
+                __raw_writel(pend, S3C2410_SUBSRCPND);
+                last = pend;
+        }
+
+        /* register the main interrupts */
+
+        irqdbf("s3c2410_init_irq: registering s3c2410 interrupt handlers\n");
+
+        for (irqno = IRQ_EINT4t7; irqno <= IRQ_ADCPARENT; irqno++) {
+                /* set all the s3c2410 internal irqs */
+
+                switch (irqno) {
+                        /* deal with the special IRQs (cascaded) */
+
+                case IRQ_EINT4t7:
+                case IRQ_EINT8t23:
+                case IRQ_UART0:
+                case IRQ_UART1:
+                case IRQ_UART2:
+                case IRQ_ADCPARENT:
+                        set_irq_chip(irqno, &s3c_irq_level_chip);
+                        set_irq_handler(irqno, handle_level_irq);
+                        break;
+
+                case IRQ_RESERVED6:
+                case IRQ_RESERVED24:
+                        /* no IRQ here */
+                        break;
+
+                default:
+                        //irqdbf("registering irq %d (s3c irq)\n", irqno);
+                        set_irq_chip(irqno, &s3c_irq_chip);
+                        set_irq_handler(irqno, handle_edge_irq);
+                        set_irq_flags(irqno, IRQF_VALID);
+                }
+        }
+
+        /* setup the cascade irq handlers */
+
+        set_irq_chained_handler(IRQ_EINT4t7, s3c_irq_demux_extint4t7);
+        set_irq_chained_handler(IRQ_EINT8t23, s3c_irq_demux_extint8);
+
+        set_irq_chained_handler(IRQ_UART0, s3c_irq_demux_uart0);
+        set_irq_chained_handler(IRQ_UART1, s3c_irq_demux_uart1);
+        set_irq_chained_handler(IRQ_UART2, s3c_irq_demux_uart2);
+        set_irq_chained_handler(IRQ_ADCPARENT, s3c_irq_demux_adc);
+
+        /* external interrupts */
+
+        for (irqno = IRQ_EINT0; irqno <= IRQ_EINT3; irqno++) {
+                irqdbf("registering irq %d (ext int)\n", irqno);
+                set_irq_chip(irqno, &s3c_irq_eint0t4);
+                set_irq_handler(irqno, handle_edge_irq);
+                set_irq_flags(irqno, IRQF_VALID);
+        }
+
+        for (irqno = IRQ_EINT4; irqno <= IRQ_EINT23; irqno++) {
+                irqdbf("registering irq %d (extended s3c irq)\n", irqno);
+                set_irq_chip(irqno, &s3c_irqext_chip);
+                set_irq_handler(irqno, handle_edge_irq);
+                set_irq_flags(irqno, IRQF_VALID);
+        }
+
+        /* register the uart interrupts */
+
+        irqdbf("s3c2410: registering external interrupts\n");
+
+        for (irqno = IRQ_S3CUART_RX0; irqno <= IRQ_S3CUART_ERR0; irqno++) {
+                irqdbf("registering irq %d (s3c uart0 irq)\n", irqno);
+                set_irq_chip(irqno, &s3c_irq_uart0);
+                set_irq_handler(irqno, handle_level_irq);
+                set_irq_flags(irqno, IRQF_VALID);
+        }
+
+        for (irqno = IRQ_S3CUART_RX1; irqno <= IRQ_S3CUART_ERR1; irqno++) {
+                irqdbf("registering irq %d (s3c uart1 irq)\n", irqno);
+                set_irq_chip(irqno, &s3c_irq_uart1);
+                set_irq_handler(irqno, handle_level_irq);
+                set_irq_flags(irqno, IRQF_VALID);
+        }
+
+        for (irqno = IRQ_S3CUART_RX2; irqno <= IRQ_S3CUART_ERR2; irqno++) {
+                irqdbf("registering irq %d (s3c uart2 irq)\n", irqno);
+                set_irq_chip(irqno, &s3c_irq_uart2);
+                set_irq_handler(irqno, handle_level_irq);
+                set_irq_flags(irqno, IRQF_VALID);
+        }
+
+        for (irqno = IRQ_TC; irqno <= IRQ_ADC; irqno++) {
+                irqdbf("registering irq %d (s3c adc irq)\n", irqno);
+                set_irq_chip(irqno, &s3c_irq_adc);
+                set_irq_handler(irqno, handle_edge_irq);
+                set_irq_flags(irqno, IRQF_VALID);
+        }
+
+        irqdbf("s3c2410: registered interrupt handlers\n");
+}