irqchip: irq-armada-370-xp: Do the set_smp_cross_call() in the driver

Instead of having the SoC code in arch/arm/mach-mvebu/platsmp.c do the
set_smp_cross_call() to register the IPI-triggering function, it makes
more sense to do exactly what the GIC driver is doing: let the irqchip
driver do it. This way, it avoids having to expose the
armada_mpic_send_doorbell() function between the irqchip driver and
the SoC code.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Link: https://lkml.kernel.org/r/1397483648-26611-5-git-send-email-thomas.petazzoni@free-electrons.com
Signed-off-by: Jason Cooper <jason@lakedaemon.net>

arch/arm/mach-mvebu/armada-370-xp.h

@@ -20,7 +20,6 @@
 
 #define ARMADA_XP_MAX_CPUS 4
 
-void armada_mpic_send_doorbell(const struct cpumask *mask, unsigned int irq);
 void armada_xp_mpic_smp_cpu_init(void);
 void armada_xp_secondary_startup(void);
 extern struct smp_operations armada_xp_smp_ops;

arch/arm/mach-mvebu/platsmp.c

@@ -90,8 +90,6 @@ static void __init armada_xp_smp_init_cpus(void)
 
 	if (ncores == 0 || ncores > ARMADA_XP_MAX_CPUS)
 		panic("Invalid number of CPUs in DT\n");
-
-	set_smp_cross_call(armada_mpic_send_doorbell);
 }
 
 static void __init armada_xp_smp_prepare_cpus(unsigned int max_cpus)

drivers/irqchip/irq-armada-370-xp.c

@@ -315,7 +315,8 @@ static int armada_370_xp_mpic_irq_map(struct irq_domain *h,
 }
 
 #ifdef CONFIG_SMP
-void armada_mpic_send_doorbell(const struct cpumask *mask, unsigned int irq)
+static void armada_mpic_send_doorbell(const struct cpumask *mask,
+				      unsigned int irq)
 {
 	int cpu;
 	unsigned long map = 0;
@@ -511,6 +512,9 @@ static int __init armada_370_xp_mpic_of_init(struct device_node *node,
 	if (parent_irq <= 0) {
 		irq_set_default_host(armada_370_xp_mpic_domain);
 		set_handle_irq(armada_370_xp_handle_irq);
+#ifdef CONFIG_SMP
+		set_smp_cross_call(armada_mpic_send_doorbell);
+#endif
 	} else {
 		irq_set_chained_handler(parent_irq,
 					armada_370_xp_mpic_handle_cascade_irq);