ARM: 8367/1: sa1100: prepare for moving irq driver to drivers/irqchip

Prepare for moving sa1100 irq driver to irqchip infrastructure - split
sa1100_init_irq into helper code and irq parts.

Signed-off-by: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

arch/arm/mach-sa1100/generic.c

@@ -20,6 +20,7 @@
 #include <linux/ioport.h>
 #include <linux/platform_device.h>
 #include <linux/reboot.h>
+#include <linux/irqchip/irq-sa11x0.h>
 
 #include <video/sa1100fb.h>
 
@@ -377,6 +378,18 @@ void __init sa1100_timer_init(void)
 	pxa_timer_nodt_init(IRQ_OST0, io_p2v(0x90000000), 3686400);
 }
 
+static struct resource irq_resource =
+	DEFINE_RES_MEM_NAMED(0x90050000, SZ_64K, "irqs");
+
+void __init sa1100_init_irq(void)
+{
+	request_resource(&iomem_resource, &irq_resource);
+
+	sa11x0_init_irq_nodt(IRQ_GPIO0_SC, irq_resource.start);
+
+	sa1100_init_gpio();
+}
+
 /*
  * Disable the memory bus request/grant signals on the SA1110 to
  * ensure that we don't receive spurious memory requests.  We set

arch/arm/mach-sa1100/irq.c

@@ -1,9 +1,10 @@
 /*
  * linux/arch/arm/mach-sa1100/irq.c
  *
+ * Copyright (C) 2015 Dmitry Eremin-Solenikov
  * Copyright (C) 1999-2001 Nicolas Pitre
  *
- * Generic IRQ handling for the SA11x0, GPIO 11-27 IRQ demultiplexing.
+ * Generic IRQ handling for the SA11x0.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
@@ -15,16 +16,13 @@
 #include <linux/io.h>
 #include <linux/irq.h>
 #include <linux/irqdomain.h>
-#include <linux/ioport.h>
 #include <linux/syscore_ops.h>
+#include <linux/irqchip/irq-sa11x0.h>
 
 #include <soc/sa1100/pwer.h>
 
-#include <mach/irqs.h>
 #include <asm/exception.h>
 
-#include "generic.h"
-
 #define ICIP	0x00  /* IC IRQ Pending reg. */
 #define ICMR	0x04  /* IC Mask Reg.        */
 #define ICLR	0x08  /* IC Level Reg.       */
@@ -86,9 +84,6 @@ static struct irq_domain_ops sa1100_normal_irqdomain_ops = {
 
 static struct irq_domain *sa1100_normal_irqdomain;
 
-static struct resource irq_resource =
-	DEFINE_RES_MEM_NAMED(0x90050000, SZ_64K, "irqs");
-
 static struct sa1100irq_state {
 	unsigned int	saved;
 	unsigned int	icmr;
@@ -156,11 +151,9 @@ sa1100_handle_irq(struct pt_regs *regs)
 	} while (1);
 }
 
-void __init sa1100_init_irq(void)
+void __init sa11x0_init_irq_nodt(int irq_start, resource_size_t io_start)
 {
-	request_resource(&iomem_resource, &irq_resource);
-
-	iobase = ioremap(irq_resource.start, SZ_64K);
+	iobase = ioremap(io_start, SZ_64K);
 	if (WARN_ON(!iobase))
 		return;
 
@@ -177,10 +170,8 @@ void __init sa1100_init_irq(void)
 	writel_relaxed(1, iobase + ICCR);
 
 	sa1100_normal_irqdomain = irq_domain_add_simple(NULL,
-			32, IRQ_GPIO0_SC,
+			32, irq_start,
 			&sa1100_normal_irqdomain_ops, NULL);
 
 	set_handle_irq(sa1100_handle_irq);
-
-	sa1100_init_gpio();
 }

include/linux/irqchip/irq-sa11x0.h

@@ -0,0 +1,17 @@
+/*
+ * Generic IRQ handling for the SA11x0.
+ *
+ * Copyright (C) 2015 Dmitry Eremin-Solenikov
+ * Copyright (C) 1999-2001 Nicolas Pitre
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef __INCLUDE_LINUX_IRQCHIP_IRQ_SA11x0_H
+#define __INCLUDE_LINUX_IRQCHIP_IRQ_SA11x0_H
+
+void __init sa11x0_init_irq_nodt(int irq_start, resource_size_t io_start);
+
+#endif