m68k/irq: Rename irq_controller to irq_chip

Make it more similar to the genirq version:
  - Remove lock (unused as we don't do SMP anyway),
  - Prepend methods with irq_,
  - Make irq_startup() return unsigned int.

Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
diff --git a/arch/m68k/include/asm/irq.h b/arch/m68k/include/asm/irq.h
index 69ed0d74..d8c6f68 100644
--- a/arch/m68k/include/asm/irq.h
+++ b/arch/m68k/include/asm/irq.h
@@ -93,16 +93,15 @@
 	const char	*devname;
 };
 
-struct irq_controller {
+struct irq_chip {
 	const char *name;
-	spinlock_t lock;
-	int (*startup)(unsigned int irq);
-	void (*shutdown)(unsigned int irq);
-	void (*enable)(unsigned int irq);
-	void (*disable)(unsigned int irq);
+	unsigned int (*irq_startup)(unsigned int irq);
+	void (*irq_shutdown)(unsigned int irq);
+	void (*irq_enable)(unsigned int irq);
+	void (*irq_disable)(unsigned int irq);
 };
 
-extern int m68k_irq_startup(unsigned int);
+extern unsigned int m68k_irq_startup(unsigned int);
 extern void m68k_irq_shutdown(unsigned int);
 
 /*
@@ -113,7 +112,7 @@
 extern void m68k_setup_auto_interrupt(void (*handler)(unsigned int, struct pt_regs *));
 extern void m68k_setup_user_interrupt(unsigned int vec, unsigned int cnt,
 				      void (*handler)(unsigned int, struct pt_regs *));
-extern void m68k_setup_irq_controller(struct irq_controller *, unsigned int, unsigned int);
+extern void m68k_setup_irq_chip(struct irq_chip *, unsigned int, unsigned int);
 
 asmlinkage void m68k_handle_int(unsigned int);
 asmlinkage void __m68k_handle_int(unsigned int, struct pt_regs *);