aboutsummaryrefslogtreecommitdiffstats
path: root/arch/arm/plat-s5pc1xx/irq-eint.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/arm/plat-s5pc1xx/irq-eint.c')
-rw-r--r--arch/arm/plat-s5pc1xx/irq-eint.c281
1 files changed, 281 insertions, 0 deletions
diff --git a/arch/arm/plat-s5pc1xx/irq-eint.c b/arch/arm/plat-s5pc1xx/irq-eint.c
new file mode 100644
index 0000000..373122f
--- /dev/null
+++ b/arch/arm/plat-s5pc1xx/irq-eint.c
@@ -0,0 +1,281 @@
+/*
+ * linux/arch/arm/plat-s5pc1xx/irq-eint.c
+ *
+ * Copyright 2009 Samsung Electronics Co.
+ * Byungho Min <bhmin@samsung.com>
+ * Kyungin Park <kyungmin.park@samsung.com>
+ *
+ * Based on plat-s3c64xx/irq-eint.c
+ *
+ * S5PC1XX - Interrupt handling for IRQ_EINT(x)
+ *
+ * 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/sysdev.h>
+#include <linux/pm.h>
+#include <linux/gpio.h>
+
+#include <asm/hardware/vic.h>
+
+#include <mach/map.h>
+
+#include <plat/gpio-cfg.h>
+#include <plat/gpio-ext.h>
+#include <plat/pm.h>
+#include <plat/regs-gpio.h>
+#include <plat/regs-irqtype.h>
+
+/*
+ * bank is a group of external interrupt
+ * bank0 means EINT0 ... EINT7
+ * bank1 means EINT8 ... EINT15
+ * bank2 means EINT16 ... EINT23
+ * bank3 means EINT24 ... EINT31
+ */
+
+static inline int s3c_get_eint(unsigned int irq)
+{
+ int real;
+
+ if (irq < IRQ_EINT16_31)
+ real = (irq - IRQ_EINT0);
+ else
+ real = (irq - S3C_IRQ_EINT_BASE) + IRQ_EINT16_31 - IRQ_EINT0;
+
+ return real;
+}
+
+static inline int s3c_get_bank(unsigned int irq)
+{
+ return s3c_get_eint(irq) >> 3;
+}
+
+static inline int s3c_eint_to_bit(unsigned int irq)
+{
+ int real, bit;
+
+ real = s3c_get_eint(irq);
+ bit = 1 << (real & (8 - 1));
+
+ return bit;
+}
+
+static inline void s3c_irq_eint_mask(unsigned int irq)
+{
+ u32 mask;
+ u32 bank = s3c_get_bank(irq);
+
+ mask = __raw_readl(S5PC1XX_WKUP_INT_MASK(bank));
+ mask |= s3c_eint_to_bit(irq);
+ __raw_writel(mask, S5PC1XX_WKUP_INT_MASK(bank));
+}
+
+static void s3c_irq_eint_unmask(unsigned int irq)
+{
+ u32 mask;
+ u32 bank = s3c_get_bank(irq);
+
+ mask = __raw_readl(S5PC1XX_WKUP_INT_MASK(bank));
+ mask &= ~(s3c_eint_to_bit(irq));
+ __raw_writel(mask, S5PC1XX_WKUP_INT_MASK(bank));
+}
+
+static inline void s3c_irq_eint_ack(unsigned int irq)
+{
+ u32 bank = s3c_get_bank(irq);
+
+ __raw_writel(s3c_eint_to_bit(irq), S5PC1XX_WKUP_INT_PEND(bank));
+}
+
+static void s3c_irq_eint_maskack(unsigned int irq)
+{
+ /* compiler should in-line these */
+ s3c_irq_eint_mask(irq);
+ s3c_irq_eint_ack(irq);
+}
+
+static int s3c_irq_eint_set_type(unsigned int irq, unsigned int type)
+{
+ u32 bank = s3c_get_bank(irq);
+ int real = s3c_get_eint(irq);
+ int gpio, shift, sfn;
+ u32 ctrl, con = 0;
+
+ switch (type) {
+ case IRQ_TYPE_NONE:
+ printk(KERN_WARNING "No edge setting!\n");
+ break;
+
+ case IRQ_TYPE_EDGE_RISING:
+ con = S5PC1XX_WKUP_INT_RISEEDGE;
+ break;
+
+ case IRQ_TYPE_EDGE_FALLING:
+ con = S5PC1XX_WKUP_INT_FALLEDGE;
+ break;
+
+ case IRQ_TYPE_EDGE_BOTH:
+ con = S5PC1XX_WKUP_INT_BOTHEDGE;
+ break;
+
+ case IRQ_TYPE_LEVEL_LOW:
+ con = S5PC1XX_WKUP_INT_LOWLEV;
+ break;
+
+ case IRQ_TYPE_LEVEL_HIGH:
+ con = S5PC1XX_WKUP_INT_HILEV;
+ break;
+
+ default:
+ printk(KERN_ERR "No such irq type %d", type);
+ return -EINVAL;
+ }
+
+ gpio = real & (8 - 1);
+ shift = gpio << 2;
+
+ ctrl = __raw_readl(S5PC1XX_WKUP_INT_CON(bank));
+ ctrl &= ~(0x7 << shift);
+ ctrl |= con << shift;
+ __raw_writel(ctrl, S5PC1XX_WKUP_INT_CON(bank));
+
+ switch (real) {
+ case 0 ... 7:
+ gpio = S5PC100_GPH0(gpio);
+ break;
+ case 8 ... 15:
+ gpio = S5PC100_GPH1(gpio);
+ break;
+ case 16 ... 23:
+ gpio = S5PC100_GPH2(gpio);
+ break;
+ case 24 ... 31:
+ gpio = S5PC100_GPH3(gpio);
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ sfn = S3C_GPIO_SFN(0x2);
+ s3c_gpio_cfgpin(gpio, sfn);
+
+ return 0;
+}
+
+static struct irq_chip s3c_irq_eint = {
+ .name = "EINT",
+ .mask = s3c_irq_eint_mask,
+ .unmask = s3c_irq_eint_unmask,
+ .mask_ack = s3c_irq_eint_maskack,
+ .ack = s3c_irq_eint_ack,
+ .set_type = s3c_irq_eint_set_type,
+ .set_wake = s3c_irqext_wake,
+};
+
+/* s3c_irq_demux_eint
+ *
+ * This function demuxes the IRQ from external interrupts,
+ * from IRQ_EINT(16) to IRQ_EINT(31). It is designed to be inlined into
+ * the specific handlers s3c_irq_demux_eintX_Y.
+ */
+static inline void s3c_irq_demux_eint(unsigned int start, unsigned int end)
+{
+ u32 status = __raw_readl(S5PC1XX_WKUP_INT_PEND((start >> 3)));
+ u32 mask = __raw_readl(S5PC1XX_WKUP_INT_MASK((start >> 3)));
+ unsigned int irq;
+
+ status &= ~mask;
+ status &= (1 << (end - start + 1)) - 1;
+
+ for (irq = IRQ_EINT(start); irq <= IRQ_EINT(end); irq++) {
+ if (status & 1)
+ generic_handle_irq(irq);
+
+ status >>= 1;
+ }
+}
+
+static void s3c_irq_demux_eint16_31(unsigned int irq, struct irq_desc *desc)
+{
+ s3c_irq_demux_eint(16, 23);
+ s3c_irq_demux_eint(24, 31);
+}
+
+/*
+ * Handle EINT0 ... EINT15 at VIC directly
+ */
+static void s3c_irq_vic_eint_mask(unsigned int irq)
+{
+ void __iomem *base = get_irq_chip_data(irq);
+ unsigned int real;
+
+ s3c_irq_eint_mask(irq);
+ real = s3c_get_eint(irq);
+ writel(1 << real, base + VIC_INT_ENABLE_CLEAR);
+}
+
+static void s3c_irq_vic_eint_unmask(unsigned int irq)
+{
+ void __iomem *base = get_irq_chip_data(irq);
+ unsigned int real;
+
+ s3c_irq_eint_unmask(irq);
+ real = s3c_get_eint(irq);
+ writel(1 << real, base + VIC_INT_ENABLE);
+}
+
+static inline void s3c_irq_vic_eint_ack(unsigned int irq)
+{
+ u32 bit;
+ u32 bank = s3c_get_bank(irq);
+
+ bit = s3c_eint_to_bit(irq);
+ __raw_writel(bit, S5PC1XX_WKUP_INT_PEND(bank));
+}
+
+static void s3c_irq_vic_eint_maskack(unsigned int irq)
+{
+ /* compiler should in-line these */
+ s3c_irq_vic_eint_mask(irq);
+ s3c_irq_vic_eint_ack(irq);
+}
+
+static struct irq_chip s3c_irq_vic_eint = {
+ .name = "EINT",
+ .mask = s3c_irq_vic_eint_mask,
+ .unmask = s3c_irq_vic_eint_unmask,
+ .mask_ack = s3c_irq_vic_eint_maskack,
+ .ack = s3c_irq_vic_eint_ack,
+ .set_type = s3c_irq_eint_set_type,
+ .set_wake = s3c_irqext_wake,
+};
+
+static int __init s5pc1xx_init_irq_eint(void)
+{
+ int irq;
+
+ for (irq = IRQ_EINT0; irq <= IRQ_EINT15; irq++) {
+ set_irq_chip(irq, &s3c_irq_vic_eint);
+ set_irq_handler(irq, handle_level_irq);
+ set_irq_flags(irq, IRQF_VALID);
+ }
+
+ for (irq = IRQ_EINT(16); irq <= IRQ_EINT(31); irq++) {
+ set_irq_chip(irq, &s3c_irq_eint);
+ set_irq_handler(irq, handle_level_irq);
+ set_irq_flags(irq, IRQF_VALID);
+ }
+
+ set_irq_chained_handler(IRQ_EINT16_31, s3c_irq_demux_eint16_31);
+
+ return 0;
+}
+
+arch_initcall(s5pc1xx_init_irq_eint);