From 57f0f512b273f60d52568b8c6b77e17f5636edc0 Mon Sep 17 00:00:00 2001
From: André Fabian Silva Delgado <emulatorman@parabola.nu>
Date: Wed, 5 Aug 2015 17:04:01 -0300
Subject: Initial import

---
 arch/m68k/kernel/ints.c | 169 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 169 insertions(+)
 create mode 100644 arch/m68k/kernel/ints.c

(limited to 'arch/m68k/kernel/ints.c')

diff --git a/arch/m68k/kernel/ints.c b/arch/m68k/kernel/ints.c
new file mode 100644
index 000000000..5b8d66fbf
--- /dev/null
+++ b/arch/m68k/kernel/ints.c
@@ -0,0 +1,169 @@
+/*
+ * linux/arch/m68k/kernel/ints.c -- Linux/m68k general interrupt handling code
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file COPYING in the main directory of this archive
+ * for more details.
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/sched.h>
+#include <linux/interrupt.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/irq.h>
+
+#include <asm/setup.h>
+#include <asm/irq.h>
+#include <asm/traps.h>
+#include <asm/page.h>
+#include <asm/machdep.h>
+#include <asm/cacheflush.h>
+#include <asm/irq_regs.h>
+
+#ifdef CONFIG_Q40
+#include <asm/q40ints.h>
+#endif
+
+extern u32 auto_irqhandler_fixup[];
+extern u16 user_irqvec_fixup[];
+
+static int m68k_first_user_vec;
+
+static struct irq_chip auto_irq_chip = {
+	.name		= "auto",
+	.irq_startup	= m68k_irq_startup,
+	.irq_shutdown	= m68k_irq_shutdown,
+};
+
+static struct irq_chip user_irq_chip = {
+	.name		= "user",
+	.irq_startup	= m68k_irq_startup,
+	.irq_shutdown	= m68k_irq_shutdown,
+};
+
+/*
+ * void init_IRQ(void)
+ *
+ * Parameters:	None
+ *
+ * Returns:	Nothing
+ *
+ * This function should be called during kernel startup to initialize
+ * the IRQ handling routines.
+ */
+
+void __init init_IRQ(void)
+{
+	int i;
+
+	for (i = IRQ_AUTO_1; i <= IRQ_AUTO_7; i++)
+		irq_set_chip_and_handler(i, &auto_irq_chip, handle_simple_irq);
+
+	mach_init_IRQ();
+}
+
+/**
+ * m68k_setup_auto_interrupt
+ * @handler: called from auto vector interrupts
+ *
+ * setup the handler to be called from auto vector interrupts instead of the
+ * standard do_IRQ(), it will be called with irq numbers in the range
+ * from IRQ_AUTO_1 - IRQ_AUTO_7.
+ */
+void __init m68k_setup_auto_interrupt(void (*handler)(unsigned int, struct pt_regs *))
+{
+	if (handler)
+		*auto_irqhandler_fixup = (u32)handler;
+	flush_icache();
+}
+
+/**
+ * m68k_setup_user_interrupt
+ * @vec: first user vector interrupt to handle
+ * @cnt: number of active user vector interrupts
+ *
+ * setup user vector interrupts, this includes activating the specified range
+ * of interrupts, only then these interrupts can be requested (note: this is
+ * different from auto vector interrupts).
+ */
+void __init m68k_setup_user_interrupt(unsigned int vec, unsigned int cnt)
+{
+	int i;
+
+	BUG_ON(IRQ_USER + cnt > NR_IRQS);
+	m68k_first_user_vec = vec;
+	for (i = 0; i < cnt; i++)
+		irq_set_chip_and_handler(i, &user_irq_chip, handle_simple_irq);
+	*user_irqvec_fixup = vec - IRQ_USER;
+	flush_icache();
+}
+
+/**
+ * m68k_setup_irq_controller
+ * @chip: irq chip which controls specified irq
+ * @handle: flow handler which handles specified irq
+ * @irq: first irq to be managed by the controller
+ * @cnt: number of irqs to be managed by the controller
+ *
+ * Change the controller for the specified range of irq, which will be used to
+ * manage these irq. auto/user irq already have a default controller, which can
+ * be changed as well, but the controller probably should use m68k_irq_startup/
+ * m68k_irq_shutdown.
+ */
+void m68k_setup_irq_controller(struct irq_chip *chip,
+			       irq_flow_handler_t handle, unsigned int irq,
+			       unsigned int cnt)
+{
+	int i;
+
+	for (i = 0; i < cnt; i++) {
+		irq_set_chip(irq + i, chip);
+		if (handle)
+			irq_set_handler(irq + i, handle);
+	}
+}
+
+unsigned int m68k_irq_startup_irq(unsigned int irq)
+{
+	if (irq <= IRQ_AUTO_7)
+		vectors[VEC_SPUR + irq] = auto_inthandler;
+	else
+		vectors[m68k_first_user_vec + irq - IRQ_USER] = user_inthandler;
+	return 0;
+}
+
+unsigned int m68k_irq_startup(struct irq_data *data)
+{
+	return m68k_irq_startup_irq(data->irq);
+}
+
+void m68k_irq_shutdown(struct irq_data *data)
+{
+	unsigned int irq = data->irq;
+
+	if (irq <= IRQ_AUTO_7)
+		vectors[VEC_SPUR + irq] = bad_inthandler;
+	else
+		vectors[m68k_first_user_vec + irq - IRQ_USER] = bad_inthandler;
+}
+
+
+unsigned int irq_canonicalize(unsigned int irq)
+{
+#ifdef CONFIG_Q40
+	if (MACH_IS_Q40 && irq == 11)
+		irq = 10;
+#endif
+	return irq;
+}
+
+EXPORT_SYMBOL(irq_canonicalize);
+
+
+asmlinkage void handle_badint(struct pt_regs *regs)
+{
+	atomic_inc(&irq_err_count);
+	pr_warn("unexpected interrupt from %u\n", regs->vector);
+}
-- 
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