irqchip: irq-armada-370-xp: Use cpu notifier to initialize secondary CPUs
Some irqchip initialization must be done on secondary CPUs. On mvebu platforms, this is currently achieved by having the arch/arm/mach-mvebu/platsmp.c code directly call into a function exported by the irqchip driver, which isn't really nice. This commit changes this by using the same solution as the one used in the GIC driver: the irqchip driver registers a CPU notifier, which is used to do the secondary CPU IRQ initialization. This way, the irqchip driver is completely autonomous, and the function no longer needs to be exposed from the irqchip driver to the SoC code. Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Link: https://lkml.kernel.org/r/1397483648-26611-6-git-send-email-thomas.petazzoni@free-electrons.com Signed-off-by: Jason Cooper <jason@lakedaemon.net>
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@ -20,7 +20,6 @@
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#define ARMADA_XP_MAX_CPUS 4
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void armada_xp_mpic_smp_cpu_init(void);
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void armada_xp_secondary_startup(void);
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extern struct smp_operations armada_xp_smp_ops;
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#endif
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@ -70,11 +70,6 @@ static void __init set_secondary_cpus_clock(void)
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}
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}
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static void armada_xp_secondary_init(unsigned int cpu)
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{
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armada_xp_mpic_smp_cpu_init();
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}
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static int armada_xp_boot_secondary(unsigned int cpu, struct task_struct *idle)
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{
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pr_info("Booting CPU %d\n", cpu);
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@ -122,7 +117,6 @@ static void __init armada_xp_smp_prepare_cpus(unsigned int max_cpus)
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struct smp_operations armada_xp_smp_ops __initdata = {
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.smp_init_cpus = armada_xp_smp_init_cpus,
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.smp_prepare_cpus = armada_xp_smp_prepare_cpus,
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.smp_secondary_init = armada_xp_secondary_init,
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.smp_boot_secondary = armada_xp_boot_secondary,
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#ifdef CONFIG_HOTPLUG_CPU
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.cpu_die = armada_xp_cpu_die,
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@ -19,6 +19,7 @@
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#include <linux/irq.h>
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#include <linux/interrupt.h>
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#include <linux/irqchip/chained_irq.h>
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#include <linux/cpu.h>
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#include <linux/io.h>
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#include <linux/of_address.h>
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#include <linux/of_irq.h>
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@ -336,7 +337,7 @@ static void armada_mpic_send_doorbell(const struct cpumask *mask,
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ARMADA_370_XP_SW_TRIG_INT_OFFS);
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}
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void armada_xp_mpic_smp_cpu_init(void)
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static void armada_xp_mpic_smp_cpu_init(void)
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{
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/* Clear pending IPIs */
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writel(0, per_cpu_int_base + ARMADA_370_XP_IN_DRBEL_CAUSE_OFFS);
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@ -348,6 +349,20 @@ void armada_xp_mpic_smp_cpu_init(void)
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/* Unmask IPI interrupt */
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writel(0, per_cpu_int_base + ARMADA_370_XP_INT_CLEAR_MASK_OFFS);
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}
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static int armada_xp_mpic_secondary_init(struct notifier_block *nfb,
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unsigned long action, void *hcpu)
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{
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if (action == CPU_STARTING || action == CPU_STARTING_FROZEN)
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armada_xp_mpic_smp_cpu_init();
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return NOTIFY_OK;
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}
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static struct notifier_block armada_370_xp_mpic_cpu_notifier = {
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.notifier_call = armada_xp_mpic_secondary_init,
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.priority = 100,
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};
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#endif /* CONFIG_SMP */
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static struct irq_domain_ops armada_370_xp_mpic_irq_ops = {
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@ -514,6 +529,7 @@ static int __init armada_370_xp_mpic_of_init(struct device_node *node,
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set_handle_irq(armada_370_xp_handle_irq);
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#ifdef CONFIG_SMP
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set_smp_cross_call(armada_mpic_send_doorbell);
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register_cpu_notifier(&armada_370_xp_mpic_cpu_notifier);
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#endif
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} else {
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irq_set_chained_handler(parent_irq,
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