1 files changed, 250 insertions, 0 deletions

diff --git a/arch/arm/mach-s3c24xx/irq-s3c2416.c b/arch/arm/mach-s3c24xx/irq-s3c2416.c
new file mode 100644
index 000000000000..fd49f35e448e
--- /dev/null
+++ b/arch/arm/mach-s3c24xx/irq-s3c2416.c
@@ -0,0 +1,250 @@
+/* linux/arch/arm/mach-s3c2416/irq.c
+ *
+ * Copyright (c) 2009 Yauhen Kharuzhy <jekhor@gmail.com>,
+ *      as part of OpenInkpot project
+ * Copyright (c) 2009 Promwad Innovation Company
+ *      Yauhen Kharuzhy <yauhen.kharuzhy@promwad.com>
+ *
+ * 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
+ *
+*/
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/ioport.h>
+#include <linux/device.h>
+#include <linux/io.h>
+
+#include <mach/hardware.h>
+#include <asm/irq.h>
+
+#include <asm/mach/irq.h>
+
+#include <mach/regs-irq.h>
+#include <mach/regs-gpio.h>
+
+#include <plat/cpu.h>
+#include <plat/pm.h>
+#include <plat/irq.h>
+
+#define INTMSK(start, end) ((1 << ((end) + 1 - (start))) - 1)
+
+static inline void s3c2416_irq_demux(unsigned int irq, unsigned int len)
+{
+        unsigned int subsrc, submsk;
+        unsigned int end;
+
+        /* 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 >>= (irq - S3C2410_IRQSUB(0));
+        subsrc  &= (1 << len)-1;
+
+        end = len + irq;
+
+        for (; irq < end && subsrc; irq++) {
+                if (subsrc & 1)
+                        generic_handle_irq(irq);
+
+                subsrc >>= 1;
+        }
+}
+
+/* WDT/AC97 sub interrupts */
+
+static void s3c2416_irq_demux_wdtac97(unsigned int irq, struct irq_desc *desc)
+{
+        s3c2416_irq_demux(IRQ_S3C2443_WDT, 4);
+}
+
+#define INTMSK_WDTAC97  (1UL << (IRQ_WDT - IRQ_EINT0))
+#define SUBMSK_WDTAC97  INTMSK(IRQ_S3C2443_WDT, IRQ_S3C2443_AC97)
+
+static void s3c2416_irq_wdtac97_mask(struct irq_data *data)
+{
+        s3c_irqsub_mask(data->irq, INTMSK_WDTAC97, SUBMSK_WDTAC97);
+}
+
+static void s3c2416_irq_wdtac97_unmask(struct irq_data *data)
+{
+        s3c_irqsub_unmask(data->irq, INTMSK_WDTAC97);
+}
+
+static void s3c2416_irq_wdtac97_ack(struct irq_data *data)
+{
+        s3c_irqsub_maskack(data->irq, INTMSK_WDTAC97, SUBMSK_WDTAC97);
+}
+
+static struct irq_chip s3c2416_irq_wdtac97 = {
+        .irq_mask       = s3c2416_irq_wdtac97_mask,
+        .irq_unmask     = s3c2416_irq_wdtac97_unmask,
+        .irq_ack        = s3c2416_irq_wdtac97_ack,
+};
+
+/* LCD sub interrupts */
+
+static void s3c2416_irq_demux_lcd(unsigned int irq, struct irq_desc *desc)
+{
+        s3c2416_irq_demux(IRQ_S3C2443_LCD1, 4);
+}
+
+#define INTMSK_LCD      (1UL << (IRQ_LCD - IRQ_EINT0))
+#define SUBMSK_LCD      INTMSK(IRQ_S3C2443_LCD1, IRQ_S3C2443_LCD4)
+
+static void s3c2416_irq_lcd_mask(struct irq_data *data)
+{
+        s3c_irqsub_mask(data->irq, INTMSK_LCD, SUBMSK_LCD);
+}
+
+static void s3c2416_irq_lcd_unmask(struct irq_data *data)
+{
+        s3c_irqsub_unmask(data->irq, INTMSK_LCD);
+}
+
+static void s3c2416_irq_lcd_ack(struct irq_data *data)
+{
+        s3c_irqsub_maskack(data->irq, INTMSK_LCD, SUBMSK_LCD);
+}
+
+static struct irq_chip s3c2416_irq_lcd = {
+        .irq_mask       = s3c2416_irq_lcd_mask,
+        .irq_unmask     = s3c2416_irq_lcd_unmask,
+        .irq_ack        = s3c2416_irq_lcd_ack,
+};
+
+/* DMA sub interrupts */
+
+static void s3c2416_irq_demux_dma(unsigned int irq, struct irq_desc *desc)
+{
+        s3c2416_irq_demux(IRQ_S3C2443_DMA0, 6);
+}
+
+#define INTMSK_DMA      (1UL << (IRQ_S3C2443_DMA - IRQ_EINT0))
+#define SUBMSK_DMA      INTMSK(IRQ_S3C2443_DMA0, IRQ_S3C2443_DMA5)
+
+
+static void s3c2416_irq_dma_mask(struct irq_data *data)
+{
+        s3c_irqsub_mask(data->irq, INTMSK_DMA, SUBMSK_DMA);
+}
+
+static void s3c2416_irq_dma_unmask(struct irq_data *data)
+{
+        s3c_irqsub_unmask(data->irq, INTMSK_DMA);
+}
+
+static void s3c2416_irq_dma_ack(struct irq_data *data)
+{
+        s3c_irqsub_maskack(data->irq, INTMSK_DMA, SUBMSK_DMA);
+}
+
+static struct irq_chip s3c2416_irq_dma = {
+        .irq_mask       = s3c2416_irq_dma_mask,
+        .irq_unmask     = s3c2416_irq_dma_unmask,
+        .irq_ack        = s3c2416_irq_dma_ack,
+};
+
+/* UART3 sub interrupts */
+
+static void s3c2416_irq_demux_uart3(unsigned int irq, struct irq_desc *desc)
+{
+        s3c2416_irq_demux(IRQ_S3C2443_RX3, 3);
+}
+
+#define INTMSK_UART3    (1UL << (IRQ_S3C2443_UART3 - IRQ_EINT0))
+#define SUBMSK_UART3    (0x7 << (IRQ_S3C2443_RX3 - S3C2410_IRQSUB(0)))
+
+static void s3c2416_irq_uart3_mask(struct irq_data *data)
+{
+        s3c_irqsub_mask(data->irq, INTMSK_UART3, SUBMSK_UART3);
+}
+
+static void s3c2416_irq_uart3_unmask(struct irq_data *data)
+{
+        s3c_irqsub_unmask(data->irq, INTMSK_UART3);
+}
+
+static void s3c2416_irq_uart3_ack(struct irq_data *data)
+{
+        s3c_irqsub_maskack(data->irq, INTMSK_UART3, SUBMSK_UART3);
+}
+
+static struct irq_chip s3c2416_irq_uart3 = {
+        .irq_mask       = s3c2416_irq_uart3_mask,
+        .irq_unmask     = s3c2416_irq_uart3_unmask,
+        .irq_ack        = s3c2416_irq_uart3_ack,
+};
+
+/* IRQ initialisation code */
+
+static int __init s3c2416_add_sub(unsigned int base,
+                                   void (*demux)(unsigned int,
+                                                 struct irq_desc *),
+                                   struct irq_chip *chip,
+                                   unsigned int start, unsigned int end)
+{
+        unsigned int irqno;
+
+        irq_set_chip_and_handler(base, &s3c_irq_level_chip, handle_level_irq);
+        irq_set_chained_handler(base, demux);
+
+        for (irqno = start; irqno <= end; irqno++) {
+                irq_set_chip_and_handler(irqno, chip, handle_level_irq);
+                set_irq_flags(irqno, IRQF_VALID);
+        }
+
+        return 0;
+}
+
+static int __init s3c2416_irq_add(struct device *dev,
+                                  struct subsys_interface *sif)
+{
+        printk(KERN_INFO "S3C2416: IRQ Support\n");
+
+        s3c2416_add_sub(IRQ_LCD, s3c2416_irq_demux_lcd, &s3c2416_irq_lcd,
+                        IRQ_S3C2443_LCD2, IRQ_S3C2443_LCD4);
+
+        s3c2416_add_sub(IRQ_S3C2443_DMA, s3c2416_irq_demux_dma,
+                        &s3c2416_irq_dma, IRQ_S3C2443_DMA0, IRQ_S3C2443_DMA5);
+
+        s3c2416_add_sub(IRQ_S3C2443_UART3, s3c2416_irq_demux_uart3,
+                        &s3c2416_irq_uart3,
+                        IRQ_S3C2443_RX3, IRQ_S3C2443_ERR3);
+
+        s3c2416_add_sub(IRQ_WDT, s3c2416_irq_demux_wdtac97,
+                        &s3c2416_irq_wdtac97,
+                        IRQ_S3C2443_WDT, IRQ_S3C2443_AC97);
+
+        return 0;
+}
+
+static struct subsys_interface s3c2416_irq_interface = {
+        .name           = "s3c2416_irq",
+        .subsys         = &s3c2416_subsys,
+        .add_dev        = s3c2416_irq_add,
+};
+
+static int __init s3c2416_irq_init(void)
+{
+        return subsys_interface_register(&s3c2416_irq_interface);
+}
+
+arch_initcall(s3c2416_irq_init);
+