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Diffstat (limited to 'arch/arm/plat-samsung/s5p-irq-gpioint.c')
-rw-r--r--arch/arm/plat-samsung/s5p-irq-gpioint.c215
1 files changed, 215 insertions, 0 deletions
diff --git a/arch/arm/plat-samsung/s5p-irq-gpioint.c b/arch/arm/plat-samsung/s5p-irq-gpioint.c
new file mode 100644
index 0000000..f9431fe
--- /dev/null
+++ b/arch/arm/plat-samsung/s5p-irq-gpioint.c
@@ -0,0 +1,215 @@
+/*
+ * 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 <linux/slab.h>
+
+#include <mach/map.h>
+#include <plat/gpio-core.h>
+#include <plat/gpio-cfg.h>
+
+#include <asm/mach/irq.h>
+
+#define GPIO_BASE(chip) (((unsigned long)(chip)->base) & 0xFFFFF000u)
+
+#define CON_OFFSET 0x700
+#define MASK_OFFSET 0x900
+#define PEND_OFFSET 0xA00
+#define REG_OFFSET(x) ((x) << 2)
+
+struct s5p_gpioint_bank {
+ struct list_head list;
+ int start;
+ int nr_groups;
+ int irq;
+ struct samsung_gpio_chip **chips;
+ void (*handler)(unsigned int, struct irq_desc *);
+};
+
+static LIST_HEAD(banks);
+
+static int s5p_gpioint_set_type(struct irq_data *d, unsigned int type)
+{
+ struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
+ struct irq_chip_type *ct = gc->chip_types;
+ unsigned int shift = (d->irq - gc->irq_base) << 2;
+
+ switch (type) {
+ case IRQ_TYPE_EDGE_RISING:
+ type = S5P_IRQ_TYPE_EDGE_RISING;
+ break;
+ case IRQ_TYPE_EDGE_FALLING:
+ type = S5P_IRQ_TYPE_EDGE_FALLING;
+ break;
+ case IRQ_TYPE_EDGE_BOTH:
+ type = S5P_IRQ_TYPE_EDGE_BOTH;
+ break;
+ case IRQ_TYPE_LEVEL_HIGH:
+ type = S5P_IRQ_TYPE_LEVEL_HIGH;
+ break;
+ case IRQ_TYPE_LEVEL_LOW:
+ type = S5P_IRQ_TYPE_LEVEL_LOW;
+ break;
+ case IRQ_TYPE_NONE:
+ default:
+ printk(KERN_WARNING "No irq type\n");
+ return -EINVAL;
+ }
+
+ gc->type_cache &= ~(0x7 << shift);
+ gc->type_cache |= type << shift;
+ writel(gc->type_cache, gc->reg_base + ct->regs.type);
+ return 0;
+}
+
+static void s5p_gpioint_handler(unsigned int irq, struct irq_desc *desc)
+{
+ struct s5p_gpioint_bank *bank = irq_get_handler_data(irq);
+ int group, pend_offset, mask_offset;
+ unsigned int pend, mask;
+
+ struct irq_chip *chip = irq_get_chip(irq);
+ chained_irq_enter(chip, desc);
+
+ for (group = 0; group < bank->nr_groups; group++) {
+ struct samsung_gpio_chip *chip = bank->chips[group];
+ if (!chip)
+ continue;
+
+ pend_offset = REG_OFFSET(group);
+ pend = __raw_readl(GPIO_BASE(chip) + PEND_OFFSET + pend_offset);
+ if (!pend)
+ continue;
+
+ mask_offset = REG_OFFSET(group);
+ mask = __raw_readl(GPIO_BASE(chip) + MASK_OFFSET + mask_offset);
+ pend &= ~mask;
+
+ while (pend) {
+ int offset = fls(pend) - 1;
+ int real_irq = chip->irq_base + offset;
+ generic_handle_irq(real_irq);
+ pend &= ~BIT(offset);
+ }
+ }
+ chained_irq_exit(chip, desc);
+}
+
+static __init int s5p_gpioint_add(struct samsung_gpio_chip *chip)
+{
+ static int used_gpioint_groups = 0;
+ int group = chip->group;
+ struct s5p_gpioint_bank *b, *bank = NULL;
+ struct irq_chip_generic *gc;
+ struct irq_chip_type *ct;
+
+ if (used_gpioint_groups >= S5P_GPIOINT_GROUP_COUNT)
+ return -ENOMEM;
+
+ list_for_each_entry(b, &banks, list) {
+ if (group >= b->start && group < b->start + b->nr_groups) {
+ bank = b;
+ break;
+ }
+ }
+ if (!bank)
+ return -EINVAL;
+
+ if (!bank->handler) {
+ bank->chips = kzalloc(sizeof(struct samsung_gpio_chip *) *
+ bank->nr_groups, GFP_KERNEL);
+ if (!bank->chips)
+ return -ENOMEM;
+
+ irq_set_chained_handler(bank->irq, s5p_gpioint_handler);
+ irq_set_handler_data(bank->irq, bank);
+ bank->handler = s5p_gpioint_handler;
+ printk(KERN_INFO "Registered chained gpio int handler for interrupt %d.\n",
+ bank->irq);
+ }
+
+ /*
+ * chained GPIO irq has been successfully registered, allocate new gpio
+ * int group and assign irq nubmers
+ */
+ chip->irq_base = S5P_GPIOINT_BASE +
+ used_gpioint_groups * S5P_GPIOINT_GROUP_SIZE;
+ used_gpioint_groups++;
+
+ bank->chips[group - bank->start] = chip;
+
+ gc = irq_alloc_generic_chip("s5p_gpioint", 1, chip->irq_base,
+ (void __iomem *)GPIO_BASE(chip),
+ handle_level_irq);
+ if (!gc)
+ return -ENOMEM;
+ ct = gc->chip_types;
+ ct->chip.irq_ack = irq_gc_ack_set_bit;
+ ct->chip.irq_mask = irq_gc_mask_set_bit;
+ ct->chip.irq_unmask = irq_gc_mask_clr_bit;
+ ct->chip.irq_set_type = s5p_gpioint_set_type,
+ ct->regs.ack = PEND_OFFSET + REG_OFFSET(group - bank->start);
+ ct->regs.mask = MASK_OFFSET + REG_OFFSET(group - bank->start);
+ ct->regs.type = CON_OFFSET + REG_OFFSET(group - bank->start);
+ irq_setup_generic_chip(gc, IRQ_MSK(chip->chip.ngpio),
+ IRQ_GC_INIT_MASK_CACHE,
+ IRQ_NOREQUEST | IRQ_NOPROBE, 0);
+ return 0;
+}
+
+int __init s5p_register_gpio_interrupt(int pin)
+{
+ struct samsung_gpio_chip *my_chip = samsung_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) {
+ my_chip->chip.to_irq = samsung_gpiolib_to_irq;
+ printk(KERN_INFO "Registered interrupt support for gpio group %d.\n",
+ group);
+ return my_chip->irq_base + offset;
+ }
+ return ret;
+}
+
+int __init s5p_register_gpioint_bank(int chain_irq, int start, int nr_groups)
+{
+ struct s5p_gpioint_bank *bank;
+
+ bank = kzalloc(sizeof(*bank), GFP_KERNEL);
+ if (!bank)
+ return -ENOMEM;
+
+ bank->start = start;
+ bank->nr_groups = nr_groups;
+ bank->irq = chain_irq;
+
+ list_add_tail(&bank->list, &banks);
+ return 0;
+}