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Diffstat (limited to 'arch/arm/plat-s5p/irq-gpioint.c')
-rw-r--r--arch/arm/plat-s5p/irq-gpioint.c242
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;
+}
generated by cgit v1.2.3 (git 2.0.4) at 2024-10-30 15:25:58 +0000