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-rw-r--r--arch/arm/plat-s5p/irq-eint.c219
1 files changed, 219 insertions, 0 deletions
diff --git a/arch/arm/plat-s5p/irq-eint.c b/arch/arm/plat-s5p/irq-eint.c
new file mode 100644
index 00000000000..c496b359c37
--- /dev/null
+++ b/arch/arm/plat-s5p/irq-eint.c
@@ -0,0 +1,219 @@
+/* linux/arch/arm/plat-s5p/irq-eint.c
+ *
+ * Copyright (c) 2010 Samsung Electronics Co., Ltd.
+ * http://www.samsung.com
+ *
+ * S5P - IRQ EINT support
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+*/
+
+#include <linux/kernel.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/io.h>
+#include <linux/device.h>
+#include <linux/gpio.h>
+
+#include <asm/hardware/vic.h>
+
+#include <plat/regs-irqtype.h>
+
+#include <mach/map.h>
+#include <plat/cpu.h>
+#include <plat/pm.h>
+
+#include <plat/gpio-cfg.h>
+#include <mach/regs-gpio.h>
+
+static inline void s5p_irq_eint_mask(struct irq_data *data)
+{
+ u32 mask;
+
+ mask = __raw_readl(S5P_EINT_MASK(EINT_REG_NR(data->irq)));
+ mask |= eint_irq_to_bit(data->irq);
+ __raw_writel(mask, S5P_EINT_MASK(EINT_REG_NR(data->irq)));
+}
+
+static void s5p_irq_eint_unmask(struct irq_data *data)
+{
+ u32 mask;
+
+ mask = __raw_readl(S5P_EINT_MASK(EINT_REG_NR(data->irq)));
+ mask &= ~(eint_irq_to_bit(data->irq));
+ __raw_writel(mask, S5P_EINT_MASK(EINT_REG_NR(data->irq)));
+}
+
+static inline void s5p_irq_eint_ack(struct irq_data *data)
+{
+ __raw_writel(eint_irq_to_bit(data->irq),
+ S5P_EINT_PEND(EINT_REG_NR(data->irq)));
+}
+
+static void s5p_irq_eint_maskack(struct irq_data *data)
+{
+ /* compiler should in-line these */
+ s5p_irq_eint_mask(data);
+ s5p_irq_eint_ack(data);
+}
+
+static int s5p_irq_eint_set_type(struct irq_data *data, unsigned int type)
+{
+ int offs = EINT_OFFSET(data->irq);
+ int shift;
+ u32 ctrl, mask;
+ u32 newvalue = 0;
+
+ switch (type) {
+ case IRQ_TYPE_EDGE_RISING:
+ newvalue = S5P_IRQ_TYPE_EDGE_RISING;
+ break;
+
+ case IRQ_TYPE_EDGE_FALLING:
+ newvalue = S5P_IRQ_TYPE_EDGE_FALLING;
+ break;
+
+ case IRQ_TYPE_EDGE_BOTH:
+ newvalue = S5P_IRQ_TYPE_EDGE_BOTH;
+ break;
+
+ case IRQ_TYPE_LEVEL_LOW:
+ newvalue = S5P_IRQ_TYPE_LEVEL_LOW;
+ break;
+
+ case IRQ_TYPE_LEVEL_HIGH:
+ newvalue = S5P_IRQ_TYPE_LEVEL_HIGH;
+ break;
+
+ default:
+ printk(KERN_ERR "No such irq type %d", type);
+ return -EINVAL;
+ }
+
+ shift = (offs & 0x7) * 4;
+ mask = 0x7 << shift;
+
+ ctrl = __raw_readl(S5P_EINT_CON(EINT_REG_NR(data->irq)));
+ ctrl &= ~mask;
+ ctrl |= newvalue << shift;
+ __raw_writel(ctrl, S5P_EINT_CON(EINT_REG_NR(data->irq)));
+
+ if ((0 <= offs) && (offs < 8))
+ s3c_gpio_cfgpin(EINT_GPIO_0(offs & 0x7), EINT_MODE);
+
+ else if ((8 <= offs) && (offs < 16))
+ s3c_gpio_cfgpin(EINT_GPIO_1(offs & 0x7), EINT_MODE);
+
+ else if ((16 <= offs) && (offs < 24))
+ s3c_gpio_cfgpin(EINT_GPIO_2(offs & 0x7), EINT_MODE);
+
+ else if ((24 <= offs) && (offs < 32))
+ s3c_gpio_cfgpin(EINT_GPIO_3(offs & 0x7), EINT_MODE);
+
+ else
+ printk(KERN_ERR "No such irq number %d", offs);
+
+ return 0;
+}
+
+static struct irq_chip s5p_irq_eint = {
+ .name = "s5p-eint",
+ .irq_mask = s5p_irq_eint_mask,
+ .irq_unmask = s5p_irq_eint_unmask,
+ .irq_mask_ack = s5p_irq_eint_maskack,
+ .irq_ack = s5p_irq_eint_ack,
+ .irq_set_type = s5p_irq_eint_set_type,
+#ifdef CONFIG_PM
+ .irq_set_wake = s3c_irqext_wake,
+#endif
+};
+
+/* s5p_irq_demux_eint
+ *
+ * This function demuxes the IRQ from the group0 external interrupts,
+ * from EINTs 16 to 31. It is designed to be inlined into the specific
+ * handler s5p_irq_demux_eintX_Y.
+ *
+ * Each EINT pend/mask registers handle eight of them.
+ */
+static inline void s5p_irq_demux_eint(unsigned int start)
+{
+ u32 status = __raw_readl(S5P_EINT_PEND(EINT_REG_NR(start)));
+ u32 mask = __raw_readl(S5P_EINT_MASK(EINT_REG_NR(start)));
+ unsigned int irq;
+
+ status &= ~mask;
+ status &= 0xff;
+
+ while (status) {
+ irq = fls(status) - 1;
+ generic_handle_irq(irq + start);
+ status &= ~(1 << irq);
+ }
+}
+
+static void s5p_irq_demux_eint16_31(unsigned int irq, struct irq_desc *desc)
+{
+ s5p_irq_demux_eint(IRQ_EINT(16));
+ s5p_irq_demux_eint(IRQ_EINT(24));
+}
+
+static inline void s5p_irq_vic_eint_mask(struct irq_data *data)
+{
+ void __iomem *base = irq_data_get_irq_chip_data(data);
+
+ s5p_irq_eint_mask(data);
+ writel(1 << EINT_OFFSET(data->irq), base + VIC_INT_ENABLE_CLEAR);
+}
+
+static void s5p_irq_vic_eint_unmask(struct irq_data *data)
+{
+ void __iomem *base = irq_data_get_irq_chip_data(data);
+
+ s5p_irq_eint_unmask(data);
+ writel(1 << EINT_OFFSET(data->irq), base + VIC_INT_ENABLE);
+}
+
+static inline void s5p_irq_vic_eint_ack(struct irq_data *data)
+{
+ __raw_writel(eint_irq_to_bit(data->irq),
+ S5P_EINT_PEND(EINT_REG_NR(data->irq)));
+}
+
+static void s5p_irq_vic_eint_maskack(struct irq_data *data)
+{
+ s5p_irq_vic_eint_mask(data);
+ s5p_irq_vic_eint_ack(data);
+}
+
+static struct irq_chip s5p_irq_vic_eint = {
+ .name = "s5p_vic_eint",
+ .irq_mask = s5p_irq_vic_eint_mask,
+ .irq_unmask = s5p_irq_vic_eint_unmask,
+ .irq_mask_ack = s5p_irq_vic_eint_maskack,
+ .irq_ack = s5p_irq_vic_eint_ack,
+ .irq_set_type = s5p_irq_eint_set_type,
+#ifdef CONFIG_PM
+ .irq_set_wake = s3c_irqext_wake,
+#endif
+};
+
+int __init s5p_init_irq_eint(void)
+{
+ int irq;
+
+ for (irq = IRQ_EINT(0); irq <= IRQ_EINT(15); irq++)
+ irq_set_chip(irq, &s5p_irq_vic_eint);
+
+ for (irq = IRQ_EINT(16); irq <= IRQ_EINT(31); irq++) {
+ irq_set_chip_and_handler(irq, &s5p_irq_eint, handle_level_irq);
+ set_irq_flags(irq, IRQF_VALID);
+ }
+
+ irq_set_chained_handler(IRQ_EINT16_31, s5p_irq_demux_eint16_31);
+ return 0;
+}
+
+arch_initcall(s5p_init_irq_eint);