sh: mach-dreamcast: Convert to sparseirq.

Signed-off-by: Paul Mundt <[e-mail]>

arch/sh/Kconfig

···
 
 config SPARSE_IRQ
 	def_bool y
-	depends on SUPERH32 && !SH_DREAMCAST && !SH_HIGHLANDER && \
-		   !SH_RTS7751R2D
+	depends on SUPERH32 && !SH_HIGHLANDER && !SH_RTS7751R2D
 	help
 	  This enables support for sparse irqs. This is useful in general
 	  as most CPUs have a fairly sparse array of IRQ vectors, which

arch/sh/boards/mach-dreamcast/irq.c

···
 	/* Not reached */
 	return irq;
 }
+
+void systemasic_irq_init(void)
+{
+	int i, nid = cpu_to_node(boot_cpu_data);
+
+	/* Assign all virtual IRQs to the System ASIC int. handler */
+	for (i = HW_EVENT_IRQ_BASE; i < HW_EVENT_IRQ_MAX; i++) {
+		unsigned int irq;
+
+		irq = create_irq_nr(i, nid);
+		if (unlikely(irq == 0)) {
+			pr_err("%s: failed hooking irq %d for systemasic\n",
+			       __func__, i);
+			return;
+		}
+
+		if (unlikely(irq != i)) {
+			pr_err("%s: got irq %d but wanted %d, bailing.\n",
+			       __func__, irq, i);
+			destroy_irq(irq);
+			return;
+		}
+
+		set_irq_chip_and_handler(i, &systemasic_int,
+					 handle_level_irq);
+	}
+}

arch/sh/boards/mach-dreamcast/setup.c

···
 #include <asm/machvec.h>
 #include <mach/sysasic.h>
 
-extern struct irq_chip systemasic_int;
-extern void aica_time_init(void);
-extern int systemasic_irq_demux(int);
-
 static void __init dreamcast_setup(char **cmdline_p)
 {
-	int i;
-
-	/* Mask all hardware events */
-	/* XXX */
-
-	/* Acknowledge any previous events */
-	/* XXX */
-
-	/* Assign all virtual IRQs to the System ASIC int. handler */
-	for (i = HW_EVENT_IRQ_BASE; i < HW_EVENT_IRQ_MAX; i++)
-		set_irq_chip_and_handler(i, &systemasic_int,
-					 handle_level_irq);
-
 	board_time_init = aica_time_init;
 }
 
···
 	.mv_name		= "Sega Dreamcast",
 	.mv_setup		= dreamcast_setup,
 	.mv_irq_demux		= systemasic_irq_demux,
+	.mv_init_irq		= systemasic_irq_init,
 };

arch/sh/include/mach-dreamcast/mach/sysasic.h

···
 
 #define HW_EVENT_IRQ_MAX (HW_EVENT_IRQ_BASE + 95)
 
+/* arch/sh/boards/mach-dreamcast/irq.c */
+extern int systemasic_irq_demux(int);
+extern void systemasic_irq_init(void);
+extern void aica_time_init(void);
+
 #endif /* __ASM_SH_DREAMCAST_SYSASIC_H */