sparc32: introduce build_device_irq

build_device_irq() is used to encapsulate the plaform
specific details when we build an irq.
For now the default is a simple 1:1 but sun4d differs.
This patch refactors functionality - but does not change
the existing functionality.

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

arch/sparc/kernel/irq.h

@@ -1,3 +1,5 @@
+#include <linux/platform_device.h>
+
 #include <asm/btfixup.h>
 
 /*
@@ -7,6 +9,8 @@
  */
 struct sparc_irq_config {
 	void (*init_timers)(irq_handler_t);
+	unsigned int (*build_device_irq)(struct platform_device *op,
+	                                 unsigned int real_irq);
 };
 extern struct sparc_irq_config sparc_irq_config;
 

arch/sparc/kernel/irq_32.c

@@ -582,6 +582,12 @@ int probe_irq_off(unsigned long mask)
 }
 EXPORT_SYMBOL(probe_irq_off);
 
+static unsigned int build_device_irq(struct platform_device *op,
+                                     unsigned int real_irq)
+{
+	return real_irq;
+}
+
 /* djhr
  * This could probably be made indirect too and assigned in the CPU
  * bits of the code. That would be much nicer I think and would also
@@ -592,6 +598,8 @@ EXPORT_SYMBOL(probe_irq_off);
 
 void __init init_IRQ(void)
 {
+	sparc_irq_config.build_device_irq = build_device_irq;
+
 	switch (sparc_cpu_model) {
 	case sun4c:
 	case sun4:

arch/sparc/kernel/of_device_32.c

@@ -13,6 +13,7 @@
 #include <asm/leon_amba.h>
 
 #include "of_device_common.h"
+#include "irq.h"
 
 /*
  * PCI bus specific translator
@@ -355,7 +356,8 @@ static struct platform_device * __init scan_one_device(struct device_node *dp,
 	if (intr) {
 		op->archdata.num_irqs = len / sizeof(struct linux_prom_irqs);
 		for (i = 0; i < op->archdata.num_irqs; i++)
-			op->archdata.irqs[i] = intr[i].pri;
+			op->archdata.irqs[i] =
+			    sparc_irq_config.build_device_irq(op, intr[i].pri);
 	} else {
 		const unsigned int *irq =
 			of_get_property(dp, "interrupts", &len);
@@ -363,64 +365,13 @@ static struct platform_device * __init scan_one_device(struct device_node *dp,
 		if (irq) {
 			op->archdata.num_irqs = len / sizeof(unsigned int);
 			for (i = 0; i < op->archdata.num_irqs; i++)
-				op->archdata.irqs[i] = irq[i];
+				op->archdata.irqs[i] =
+				    sparc_irq_config.build_device_irq(op, irq[i]);
 		} else {
 			op->archdata.num_irqs = 0;
 		}
 	}
-	if (sparc_cpu_model == sun4d) {
-		static int pil_to_sbus[] = {
-			0, 0, 1, 2, 0, 3, 0, 4, 0, 5, 0, 6, 0, 7, 0, 0,
-		};
-		struct device_node *io_unit, *sbi = dp->parent;
-		const struct linux_prom_registers *regs;
-		int board, slot;
 
-		while (sbi) {
-			if (!strcmp(sbi->name, "sbi"))
-				break;
-
-			sbi = sbi->parent;
-		}
-		if (!sbi)
-			goto build_resources;
-
-		regs = of_get_property(dp, "reg", NULL);
-		if (!regs)
-			goto build_resources;
-
-		slot = regs->which_io;
-
-		/* If SBI's parent is not io-unit or the io-unit lacks
-		 * a "board#" property, something is very wrong.
-		 */
-		if (!sbi->parent || strcmp(sbi->parent->name, "io-unit")) {
-			printk("%s: Error, parent is not io-unit.\n",
-			       sbi->full_name);
-			goto build_resources;
-		}
-		io_unit = sbi->parent;
-		board = of_getintprop_default(io_unit, "board#", -1);
-		if (board == -1) {
-			printk("%s: Error, lacks board# property.\n",
-			       io_unit->full_name);
-			goto build_resources;
-		}
-
-		for (i = 0; i < op->archdata.num_irqs; i++) {
-			int this_irq = op->archdata.irqs[i];
-			int sbusl = pil_to_sbus[this_irq];
-
-			if (sbusl)
-				this_irq = (((board + 1) << 5) +
-					    (sbusl << 2) +
-					    slot);
-
-			op->archdata.irqs[i] = this_irq;
-		}
-	}
-
-build_resources:
 	build_device_resources(op, parent);
 
 	op->dev.parent = parent;

arch/sparc/kernel/sun4d_irq.c

@@ -440,6 +440,56 @@ static void __init sun4d_load_profile_irqs(void)
 	}
 }
 
+unsigned int sun4d_build_device_irq(struct platform_device *op,
+                                    unsigned int real_irq)
+{
+	static int pil_to_sbus[] = {
+		0, 0, 1, 2, 0, 3, 0, 4, 0, 5, 0, 6, 0, 7, 0, 0,
+	};
+	struct device_node *dp = op->dev.of_node;
+	struct device_node *io_unit, *sbi = dp->parent;
+	const struct linux_prom_registers *regs;
+	int board, slot;
+	int sbusl;
+
+	while (sbi) {
+		if (!strcmp(sbi->name, "sbi"))
+			break;
+
+		sbi = sbi->parent;
+	}
+	if (!sbi)
+		goto err_out;
+
+	regs = of_get_property(dp, "reg", NULL);
+	if (!regs)
+		goto err_out;
+
+	slot = regs->which_io;
+
+	/*
+	 *  If SBI's parent is not io-unit or the io-unit lacks
+	 * a "board#" property, something is very wrong.
+	 */
+	if (!sbi->parent || strcmp(sbi->parent->name, "io-unit")) {
+		printk("%s: Error, parent is not io-unit.\n", sbi->full_name);
+		goto err_out;
+	}
+	io_unit = sbi->parent;
+	board = of_getintprop_default(io_unit, "board#", -1);
+	if (board == -1) {
+		printk("%s: Error, lacks board# property.\n", io_unit->full_name);
+		goto err_out;
+	}
+
+	sbusl = pil_to_sbus[real_irq];
+	if (sbusl)
+		return (((board + 1) << 5) + (sbusl << 2) + slot);
+
+err_out:
+	return real_irq;
+}
+
 static void __init sun4d_fixup_trap_table(void)
 {
 #ifdef CONFIG_SMP
@@ -559,6 +609,7 @@ void __init sun4d_init_IRQ(void)
 	BTFIXUPSET_CALL(load_profile_irq, sun4d_load_profile_irq, BTFIXUPCALL_NORM);
 
 	sparc_irq_config.init_timers = sun4d_init_timers;
+	sparc_irq_config.build_device_irq = sun4d_build_device_irq;
 
 #ifdef CONFIG_SMP
 	BTFIXUPSET_CALL(set_cpu_int, sun4d_set_cpu_int, BTFIXUPCALL_NORM);