[ARM] 5338/1: Add Nuvoton W90P910 Platform support

[pandora-kernel.git] / arch / arm / mach-w90x900 / irq.c

diff --git a/arch/arm/mach-w90x900/irq.c b/arch/arm/mach-w90x900/irq.c
new file mode 100644 (file)
index 0000000..0b4fc19
--- /dev/null
+++ b/arch/arm/mach-w90x900/irq.c
@@ -0,0 +1,76 @@
+/*
+ * linux/arch/arm/mach-w90x900/irq.c
+ *
+ * based on linux/arch/arm/plat-s3c24xx/irq.c by Ben Dooks
+ *
+ * Copyright (c) 2008 Nuvoton technology corporation
+ * All rights reserved.
+ *
+ * Wan ZongShun <mcuos.com@gmail.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/init.h>
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/ioport.h>
+#include <linux/ptrace.h>
+#include <linux/sysdev.h>
+#include <linux/io.h>
+
+#include <asm/irq.h>
+#include <asm/mach/irq.h>
+
+#include <mach/hardware.h>
+#include <mach/regs-irq.h>
+
+static void w90x900_irq_mask(unsigned int irq)
+{
+       __raw_writel(1 << irq, REG_AIC_MDCR);
+}
+
+/*
+ * By the w90p910 spec,any irq,only write 1
+ * to REG_AIC_EOSCR for ACK
+ */
+
+static void w90x900_irq_ack(unsigned int irq)
+{
+       __raw_writel(0x01, REG_AIC_EOSCR);
+}
+
+static void w90x900_irq_unmask(unsigned int irq)
+{
+       unsigned long mask;
+
+       if (irq == IRQ_T_INT_GROUP) {
+               mask = __raw_readl(REG_AIC_GEN);
+               __raw_writel(TIME_GROUP_IRQ | mask, REG_AIC_GEN);
+               __raw_writel(1 << IRQ_T_INT_GROUP, REG_AIC_MECR);
+       }
+       __raw_writel(1 << irq, REG_AIC_MECR);
+}
+
+static struct irq_chip w90x900_irq_chip = {
+       .ack       = w90x900_irq_ack,
+       .mask      = w90x900_irq_mask,
+       .unmask    = w90x900_irq_unmask,
+};
+
+void __init w90x900_init_irq(void)
+{
+       int irqno;
+
+       __raw_writel(0xFFFFFFFE, REG_AIC_MDCR);
+
+       for (irqno = IRQ_WDT; irqno <= IRQ_ADC; irqno++) {
+               set_irq_chip(irqno, &w90x900_irq_chip);
+               set_irq_handler(irqno, handle_level_irq);
+               set_irq_flags(irqno, IRQF_VALID);
+       }
+}