1 files changed, 242 insertions, 0 deletions

diff --git a/arch/arm/plat-s5p/irq-gpioint.c b/arch/arm/plat-s5p/irq-gpioint.c
new file mode 100644
index 000000000000..32263a306c90
--- /dev/null
+++ b/arch/arm/plat-s5p/irq-gpioint.c
@@ -0,0 +1,242 @@
+/* linux/arch/arm/plat-s5p/irq-gpioint.c
+ *
+ * Copyright (c) 2010 Samsung Electronics Co., Ltd.
+ * Author: Kyungmin Park <kyungmin.park@samsung.com>
+ * Author: Joonyoung Shim <jy0922.shim@samsung.com>
+ * Author: Marek Szyprowski <m.szyprowski@samsung.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.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/io.h>
+#include <linux/gpio.h>
+
+#include <mach/map.h>
+#include <plat/gpio-core.h>
+#include <plat/gpio-cfg.h>
+
+#define S5P_GPIOREG(x)                  (S5P_VA_GPIO + (x))
+
+#define GPIOINT_CON_OFFSET              0x700
+#define GPIOINT_MASK_OFFSET             0x900
+#define GPIOINT_PEND_OFFSET             0xA00
+
+#define GPIOINT_LEVEL_LOW               0x0
+#define GPIOINT_LEVEL_HIGH              0x1
+#define GPIOINT_EDGE_FALLING            0x2
+#define GPIOINT_EDGE_RISING             0x3
+#define GPIOINT_EDGE_BOTH               0x4
+
+static struct s3c_gpio_chip *irq_chips[S5P_GPIOINT_GROUP_MAXNR];
+
+static int s5p_gpioint_get_group(unsigned int irq)
+{
+        struct gpio_chip *chip = get_irq_data(irq);
+        struct s3c_gpio_chip *s3c_chip = container_of(chip,
+                        struct s3c_gpio_chip, chip);
+        int group;
+
+        for (group = 0; group < S5P_GPIOINT_GROUP_MAXNR; group++)
+                if (s3c_chip == irq_chips[group])
+                        break;
+
+        return group;
+}
+
+static int s5p_gpioint_get_offset(unsigned int irq)
+{
+        struct gpio_chip *chip = get_irq_data(irq);
+        struct s3c_gpio_chip *s3c_chip = container_of(chip,
+                        struct s3c_gpio_chip, chip);
+
+        return irq - s3c_chip->irq_base;
+}
+
+static void s5p_gpioint_ack(unsigned int irq)
+{
+        int group, offset, pend_offset;
+        unsigned int value;
+
+        group = s5p_gpioint_get_group(irq);
+        offset = s5p_gpioint_get_offset(irq);
+        pend_offset = group << 2;
+
+        value = __raw_readl(S5P_GPIOREG(GPIOINT_PEND_OFFSET) + pend_offset);
+        value |= 1 << offset;
+        __raw_writel(value, S5P_GPIOREG(GPIOINT_PEND_OFFSET) + pend_offset);
+}
+
+static void s5p_gpioint_mask(unsigned int irq)
+{
+        int group, offset, mask_offset;
+        unsigned int value;
+
+        group = s5p_gpioint_get_group(irq);
+        offset = s5p_gpioint_get_offset(irq);
+        mask_offset = group << 2;
+
+        value = __raw_readl(S5P_GPIOREG(GPIOINT_MASK_OFFSET) + mask_offset);
+        value |= 1 << offset;
+        __raw_writel(value, S5P_GPIOREG(GPIOINT_MASK_OFFSET) + mask_offset);
+}
+
+static void s5p_gpioint_unmask(unsigned int irq)
+{
+        int group, offset, mask_offset;
+        unsigned int value;
+
+        group = s5p_gpioint_get_group(irq);
+        offset = s5p_gpioint_get_offset(irq);
+        mask_offset = group << 2;
+
+        value = __raw_readl(S5P_GPIOREG(GPIOINT_MASK_OFFSET) + mask_offset);
+        value &= ~(1 << offset);
+        __raw_writel(value, S5P_GPIOREG(GPIOINT_MASK_OFFSET) + mask_offset);
+}
+
+static void s5p_gpioint_mask_ack(unsigned int irq)
+{
+        s5p_gpioint_mask(irq);
+        s5p_gpioint_ack(irq);
+}
+
+static int s5p_gpioint_set_type(unsigned int irq, unsigned int type)
+{
+        int group, offset, con_offset;
+        unsigned int value;
+
+        group = s5p_gpioint_get_group(irq);
+        offset = s5p_gpioint_get_offset(irq);
+        con_offset = group << 2;
+
+        switch (type) {
+        case IRQ_TYPE_EDGE_RISING:
+                type = GPIOINT_EDGE_RISING;
+                break;
+        case IRQ_TYPE_EDGE_FALLING:
+                type = GPIOINT_EDGE_FALLING;
+                break;
+        case IRQ_TYPE_EDGE_BOTH:
+                type = GPIOINT_EDGE_BOTH;
+                break;
+        case IRQ_TYPE_LEVEL_HIGH:
+                type = GPIOINT_LEVEL_HIGH;
+                break;
+        case IRQ_TYPE_LEVEL_LOW:
+                type = GPIOINT_LEVEL_LOW;
+                break;
+        case IRQ_TYPE_NONE:
+        default:
+                printk(KERN_WARNING "No irq type\n");
+                return -EINVAL;
+        }
+
+        value = __raw_readl(S5P_GPIOREG(GPIOINT_CON_OFFSET) + con_offset);
+        value &= ~(0x7 << (offset * 0x4));
+        value |= (type << (offset * 0x4));
+        __raw_writel(value, S5P_GPIOREG(GPIOINT_CON_OFFSET) + con_offset);
+
+        return 0;
+}
+
+struct irq_chip s5p_gpioint = {
+        .name           = "s5p_gpioint",
+        .ack            = s5p_gpioint_ack,
+        .mask           = s5p_gpioint_mask,
+        .mask_ack       = s5p_gpioint_mask_ack,
+        .unmask         = s5p_gpioint_unmask,
+        .set_type       = s5p_gpioint_set_type,
+};
+
+static void s5p_gpioint_handler(unsigned int irq, struct irq_desc *desc)
+{
+        int group, offset, pend_offset, mask_offset;
+        int real_irq;
+        unsigned int pend, mask;
+
+        for (group = 0; group < S5P_GPIOINT_GROUP_MAXNR; group++) {
+                pend_offset = group << 2;
+                pend = __raw_readl(S5P_GPIOREG(GPIOINT_PEND_OFFSET) +
+                                pend_offset);
+                if (!pend)
+                        continue;
+
+                mask_offset = group << 2;
+                mask = __raw_readl(S5P_GPIOREG(GPIOINT_MASK_OFFSET) +
+                                mask_offset);
+                pend &= ~mask;
+
+                for (offset = 0; offset < 8; offset++) {
+                        if (pend & (1 << offset)) {
+                                struct s3c_gpio_chip *chip = irq_chips[group];
+                                if (chip) {
+                                        real_irq = chip->irq_base + offset;
+                                        generic_handle_irq(real_irq);
+                                }
+                        }
+                }
+        }
+}
+
+static __init int s5p_gpioint_add(struct s3c_gpio_chip *chip)
+{
+        static int used_gpioint_groups = 0;
+        static bool handler_registered = 0;
+        int irq, group = chip->group;
+        int i;
+
+        if (used_gpioint_groups >= S5P_GPIOINT_GROUP_COUNT)
+                return -ENOMEM;
+
+        chip->irq_base = S5P_GPIOINT_BASE +
+                         used_gpioint_groups * S5P_GPIOINT_GROUP_SIZE;
+        used_gpioint_groups++;
+
+        if (!handler_registered) {
+                set_irq_chained_handler(IRQ_GPIOINT, s5p_gpioint_handler);
+                handler_registered = 1;
+        }
+
+        irq_chips[group] = chip;
+        for (i = 0; i < chip->chip.ngpio; i++) {
+                irq = chip->irq_base + i;
+                set_irq_chip(irq, &s5p_gpioint);
+                set_irq_data(irq, &chip->chip);
+                set_irq_handler(irq, handle_level_irq);
+                set_irq_flags(irq, IRQF_VALID);
+        }
+        return 0;
+}
+
+int __init s5p_register_gpio_interrupt(int pin)
+{
+        struct s3c_gpio_chip *my_chip = s3c_gpiolib_getchip(pin);
+        int offset, group;
+        int ret;
+
+        if (!my_chip)
+                return -EINVAL;
+
+        offset = pin - my_chip->chip.base;
+        group = my_chip->group;
+
+        /* check if the group has been already registered */
+        if (my_chip->irq_base)
+                return my_chip->irq_base + offset;
+
+        /* register gpio group */
+        ret = s5p_gpioint_add(my_chip);
+        if (ret == 0) {
+                printk(KERN_INFO "Registered interrupt support for gpio group %d.\n",
+                       group);
+                return my_chip->irq_base + offset;
+        }
+        return ret;
+}