irqchip: bcm2836: Move SMP startup code to arch/arm (v2)

In order to easily provide SMP for BCM2837 on 32-bit and 64-bit
the SMP startup code was placed in irq-bcm2836. That's not the
right approach. So move this code where it belongs.

Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
Fixes: 41f4988cc2 ("irqchip/bcm2836: Add SMP support for the 2836")
Tested-by: Eric Anholt <eric@anholt.net>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>

arch/arm/mach-bcm/Makefile

@@ -43,6 +43,11 @@ endif
 
 # BCM2835
 obj-$(CONFIG_ARCH_BCM2835)	+= board_bcm2835.o
+ifeq ($(CONFIG_ARCH_BCM2835),y)
+ifeq ($(CONFIG_ARM),y)
+obj-$(CONFIG_SMP)		+= platsmp.o
+endif
+endif
 
 # BCM5301X
 obj-$(CONFIG_ARCH_BCM_5301X)	+= bcm_5301x.o

arch/arm/mach-bcm/board_bcm2835.c

@@ -19,16 +19,20 @@
 #include <asm/mach/arch.h>
 #include <asm/mach/map.h>
 
+#include "platsmp.h"
+
 static const char * const bcm2835_compat[] = {
 #ifdef CONFIG_ARCH_MULTI_V6
 	"brcm,bcm2835",
 #endif
 #ifdef CONFIG_ARCH_MULTI_V7
 	"brcm,bcm2836",
+	"brcm,bcm2837",
 #endif
 	NULL
 };
 
 DT_MACHINE_START(BCM2835, "BCM2835")
-	.dt_compat = bcm2835_compat
+	.dt_compat = bcm2835_compat,
+	.smp = smp_ops(bcm2836_smp_ops),
 MACHINE_END

arch/arm/mach-bcm/platsmp.c

@@ -17,6 +17,7 @@
 #include <linux/errno.h>
 #include <linux/init.h>
 #include <linux/io.h>
+#include <linux/irqchip/irq-bcm2836.h>
 #include <linux/jiffies.h>
 #include <linux/of.h>
 #include <linux/of_address.h>
@@ -287,6 +288,35 @@ out:
 	return ret;
 }
 
+static int bcm2836_boot_secondary(unsigned int cpu, struct task_struct *idle)
+{
+	void __iomem *intc_base;
+	struct device_node *dn;
+	char *name;
+
+	name = "brcm,bcm2836-l1-intc";
+	dn = of_find_compatible_node(NULL, NULL, name);
+	if (!dn) {
+		pr_err("unable to find intc node\n");
+		return -ENODEV;
+	}
+
+	intc_base = of_iomap(dn, 0);
+	of_node_put(dn);
+
+	if (!intc_base) {
+		pr_err("unable to remap intc base register\n");
+		return -ENOMEM;
+	}
+
+	writel(virt_to_phys(secondary_startup),
+	       intc_base + LOCAL_MAILBOX3_SET0 + 16 * cpu);
+
+	iounmap(intc_base);
+
+	return 0;
+}
+
 static const struct smp_operations kona_smp_ops __initconst = {
 	.smp_prepare_cpus	= bcm_smp_prepare_cpus,
 	.smp_boot_secondary	= kona_boot_secondary,
@@ -305,3 +335,8 @@ static const struct smp_operations nsp_smp_ops __initconst = {
 	.smp_boot_secondary	= nsp_boot_secondary,
 };
 CPU_METHOD_OF_DECLARE(bcm_smp_nsp, "brcm,bcm-nsp-smp", &nsp_smp_ops);
+
+const struct smp_operations bcm2836_smp_ops __initconst = {
+	.smp_boot_secondary	= bcm2836_boot_secondary,
+};
+CPU_METHOD_OF_DECLARE(bcm_smp_bcm2836, "brcm,bcm2836-smp", &bcm2836_smp_ops);

arch/arm/mach-bcm/platsmp.h

@@ -0,0 +1,10 @@
+/*
+ * Copyright (C) 2017 Stefan Wahren <stefan.wahren@i2se.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ */
+
+extern const struct smp_operations bcm2836_smp_ops;