ARM: Introduce plat-tcc irq framework

Introduce lowlevel interrupt routines.

Signed-off-by: "Hans J. Koch" <hjk@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

3 files changed, 113 insertions, 1 deletions

diff --git a/arch/arm/mach-tcc8k/Makefile b/arch/arm/mach-tcc8k/Makefile
index 805d850919eb..53bc2f58549b 100644
--- a/arch/arm/mach-tcc8k/Makefile
+++ b/arch/arm/mach-tcc8k/Makefile
@@ -3,4 +3,4 @@
 #
 
 # Common support
-obj-y += clock.o
+obj-y += clock.o irq.o
diff --git a/arch/arm/mach-tcc8k/common.h b/arch/arm/mach-tcc8k/common.h
index e2c902c1639c..e539548e58d2 100644
--- a/arch/arm/mach-tcc8k/common.h
+++ b/arch/arm/mach-tcc8k/common.h
@@ -2,5 +2,6 @@
 #define MACH_TCC8K_COMMON_H
 
 extern void tcc_clocks_init(unsigned long xi_freq, unsigned long xti_freq);
+extern void tcc8k_init_irq(void);
 
 #endif
diff --git a/arch/arm/mach-tcc8k/irq.c b/arch/arm/mach-tcc8k/irq.c
new file mode 100644
index 000000000000..34575c4963f0
--- /dev/null
+++ b/arch/arm/mach-tcc8k/irq.c
@@ -0,0 +1,111 @@
+/*
+ * Copyright (C) Telechips, Inc.
+ * Copyright (C) 2009-2010 Hans J. Koch <hjk@linutronix.de>
+ *
+ * Licensed under the terms of the GNU GPL version 2.
+ */
+
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+
+#include <asm/irq.h>
+#include <asm/mach/irq.h>
+
+#include <mach/tcc8k-regs.h>
+#include <mach/irqs.h>
+
+#include "common.h"
+
+/* Disable IRQ */
+static void tcc8000_mask_ack_irq0(unsigned int irq)
+{
+        PIC0_IEN &= ~(1 << irq);
+        PIC0_CREQ |=  (1 << irq);
+}
+
+static void tcc8000_mask_ack_irq1(unsigned int irq)
+{
+        PIC1_IEN &= ~(1 << (irq - 32));
+        PIC1_CREQ |= (1 << (irq - 32));
+}
+
+static void tcc8000_mask_irq0(unsigned int irq)
+{
+        PIC0_IEN &= ~(1 << irq);
+}
+
+static void tcc8000_mask_irq1(unsigned int irq)
+{
+        PIC1_IEN &= ~(1 << (irq - 32));
+}
+
+static void tcc8000_ack_irq0(unsigned int irq)
+{
+        PIC0_CREQ |=  (1 << irq);
+}
+
+static void tcc8000_ack_irq1(unsigned int irq)
+{
+        PIC1_CREQ |= (1 << (irq - 32));
+}
+
+/* Enable IRQ */
+static void tcc8000_unmask_irq0(unsigned int irq)
+{
+        PIC0_IEN |= (1 << irq);
+        PIC0_INTOEN |= (1 << irq);
+}
+
+static void tcc8000_unmask_irq1(unsigned int irq)
+{
+        PIC1_IEN |= (1 << (irq - 32));
+        PIC1_INTOEN |= (1 << (irq - 32));
+}
+
+static struct irq_chip tcc8000_irq_chip0 = {
+        .name           = "tcc_irq0",
+        .mask           = tcc8000_mask_irq0,
+        .ack            = tcc8000_ack_irq0,
+        .mask_ack       = tcc8000_mask_ack_irq0,
+        .unmask         = tcc8000_unmask_irq0,
+};
+
+static struct irq_chip tcc8000_irq_chip1 = {
+        .name           = "tcc_irq1",
+        .mask           = tcc8000_mask_irq1,
+        .ack            = tcc8000_ack_irq1,
+        .mask_ack       = tcc8000_mask_ack_irq1,
+        .unmask         = tcc8000_unmask_irq1,
+};
+
+void __init tcc8k_init_irq(void)
+{
+        int irqno;
+
+        /* Mask and clear all interrupts */
+        PIC0_IEN = 0x00000000;
+        PIC0_CREQ = 0xffffffff;
+        PIC1_IEN = 0x00000000;
+        PIC1_CREQ = 0xffffffff;
+
+        PIC0_MEN0 = 0x00000003;
+        PIC1_MEN1 = 0x00000003;
+        PIC1_MEN = 0x00000003;
+
+        /* let all IRQs be level triggered */
+        PIC0_TMODE = 0xffffffff;
+        PIC1_TMODE = 0xffffffff;
+        /* all IRQs are IRQs (not FIQs) */
+        PIC0_IRQSEL = 0xffffffff;
+        PIC1_IRQSEL = 0xffffffff;
+
+        for (irqno = 0; irqno < NR_IRQS; irqno++) {
+                if (irqno < 32)
+                        set_irq_chip(irqno, &tcc8000_irq_chip0);
+                else
+                        set_irq_chip(irqno, &tcc8000_irq_chip1);
+                set_irq_handler(irqno, handle_level_irq);
+                set_irq_flags(irqno, IRQF_VALID);
+        }
+}