From 3260740c920ea811e18bc1743c863fce74ac89b7 Mon Sep 17 00:00:00 2001
From: florian <florian@3c298f89-4303-0410-b956-a3cf2f4a3e73>
Date: Mon, 2 Apr 2007 16:59:59 +0000
Subject: Add preliminary RouterBoard RB1xx support

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@6839 3c298f89-4303-0410-b956-a3cf2f4a3e73
---
 .../linux/rb1xx-2.6/files/arch/mips/adm5120/irq.c  | 156 +++++++++++++++++++++
 1 file changed, 156 insertions(+)
 create mode 100644 target/linux/rb1xx-2.6/files/arch/mips/adm5120/irq.c

(limited to 'target/linux/rb1xx-2.6/files/arch/mips/adm5120/irq.c')

diff --git a/target/linux/rb1xx-2.6/files/arch/mips/adm5120/irq.c b/target/linux/rb1xx-2.6/files/arch/mips/adm5120/irq.c
new file mode 100644
index 000000000..46f3bb05e
--- /dev/null
+++ b/target/linux/rb1xx-2.6/files/arch/mips/adm5120/irq.c
@@ -0,0 +1,156 @@
+/*
+ *	Copyright (C) ADMtek Incorporated.
+ *		Creator : daniell@admtek.com.tw
+ *	Carsten Langgaard, carstenl@mips.com
+ *	Copyright (C) 2000, 2001 MIPS Technologies, Inc.
+ *	Copyright (C) 2001 Ralf Baechle
+ *	Copyright (C) 2005 Jeroen Vreeken (pe1rxq@amsat.org)
+ */
+
+#include <linux/autoconf.h>
+#include <linux/init.h>
+#include <linux/kernel_stat.h>
+#include <linux/signal.h>
+#include <linux/sched.h>
+#include <linux/interrupt.h>
+#include <linux/slab.h>
+#include <linux/random.h>
+#include <linux/pm.h>
+
+#include <asm/irq.h>
+#include <asm/time.h>
+#include <asm/mipsregs.h>
+#include <asm/gdb-stub.h>
+#include <asm/irq_cpu.h>
+
+#define MIPS_CPU_TIMER_IRQ 7
+
+extern int setup_irq(unsigned int irq, struct irqaction *irqaction);
+extern irq_desc_t irq_desc[];
+extern asmlinkage void mipsIRQ(void);
+
+int mips_int_lock(void);
+void mips_int_unlock(int);
+
+unsigned int mips_counter_frequency;
+
+#define ADM5120_INTC_REG(reg)	(*(volatile u32 *)(KSEG1ADDR(0x12200000+(reg))))
+#define ADM5120_INTC_STATUS	ADM5120_INTC_REG(0x00)
+#define ADM5120_INTC_ENABLE	ADM5120_INTC_REG(0x08)
+#define ADM5120_INTC_DISABLE	ADM5120_INTC_REG(0x0c)
+#define ADM5120_IRQ_MAX		9
+#define ADM5120_IRQ_MASK	0x3ff
+
+void adm5120_hw0_irqdispatch(struct pt_regs *regs)
+{
+	unsigned long intsrc;
+	int i;
+
+	intsrc = ADM5120_INTC_STATUS & ADM5120_IRQ_MASK;
+
+	for (i = 0; intsrc; intsrc >>= 1, i++)
+		if (intsrc & 0x1)
+			do_IRQ(i);
+		else
+			spurious_interrupt();
+}
+
+void mips_timer_interrupt(struct pt_regs *regs)
+{
+        write_c0_compare(read_c0_count()+ mips_counter_frequency/HZ);
+        ll_timer_interrupt(MIPS_CPU_TIMER_IRQ);
+}
+
+/* Main interrupt dispatcher */
+asmlinkage void plat_irq_dispatch(struct pt_regs *regs)
+{
+        unsigned int cp0_cause = read_c0_cause() & read_c0_status();
+
+        if (cp0_cause & CAUSEF_IP7) {
+                mips_timer_interrupt( regs);
+        } else if (cp0_cause & CAUSEF_IP2) {
+                adm5120_hw0_irqdispatch( regs);
+        }
+}
+
+void enable_adm5120_irq(unsigned int irq)
+{
+	int s;
+
+	/* Disable all interrupts (FIQ/IRQ) */
+	s = mips_int_lock();
+
+	if ((irq < 0) || (irq > ADM5120_IRQ_MAX)) 
+		goto err_exit;
+
+	ADM5120_INTC_ENABLE = (1<<irq);
+
+err_exit:
+
+	/* Restore the interrupts states */
+	mips_int_unlock(s);
+}
+
+
+void disable_adm5120_irq(unsigned int irq)
+{
+	int s;
+
+	/* Disable all interrupts (FIQ/IRQ) */
+	s = mips_int_lock();
+
+	if ((irq < 0) || (irq > ADM5120_IRQ_MAX)) 
+		goto err_exit;
+
+	ADM5120_INTC_DISABLE = (1<<irq);
+
+err_exit:
+	/* Restore the interrupts states */
+	mips_int_unlock(s);
+}
+
+unsigned int startup_adm5120_irq(unsigned int irq)
+{
+	enable_adm5120_irq(irq);
+	return 0;
+}
+
+void shutdown_adm5120_irq(unsigned int irq)
+{
+	disable_adm5120_irq(irq);
+}
+
+static inline void ack_adm5120_irq(unsigned int irq_nr)
+{
+	ADM5120_INTC_DISABLE = (1 << irq_nr);
+}
+
+
+static void end_adm5120_irq(unsigned int irq_nr)
+{
+	ADM5120_INTC_ENABLE = (1 << irq_nr);
+}
+
+static hw_irq_controller adm5120_irq_type = {
+	.typename 	= "MIPS",
+	.startup	= startup_adm5120_irq,
+	.shutdown	= shutdown_adm5120_irq,
+	.enable		= enable_adm5120_irq,
+	.disable	= disable_adm5120_irq,
+	.ack 		= ack_adm5120_irq,
+	.end		= end_adm5120_irq,
+	.set_affinity	= NULL,
+};
+
+
+void __init arch_init_irq(void)
+{
+	int i;
+	
+	for (i = 0; i <= ADM5120_IRQ_MAX; i++) {
+		irq_desc[i].status = IRQ_DISABLED;
+		irq_desc[i].action = 0;
+		irq_desc[i].depth = 1;
+		irq_desc[i].chip = &adm5120_irq_type;
+	}
+}
-- 
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