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irqchip/gic: Isolate early GIC initialisation code 

To re-use the code that initialises the GIC (found in
__gic_init_bases()), from within a platform driver, it is necessary to
move the code from the __init section so that it is always present and
not removed. Unfortunately, it is not possible to simply drop the __init
from the function declaration for __gic_init_bases() because it contains
calls to set_smp_cross_call() and set_handle_irq() which are both
located in the __init section. Fortunately, these calls are only
required for the root controller and because the initial platform driver
will only support non-root controllers that can be initialised later in
the boot process, we can move these calls to another function.

Move the bulk of the code from __gic_init_bases() to a new function
called gic_init_bases() which is not located in the __init section and
can be used by the platform driver. Update __gic_init_bases() to call
gic_init_bases() and if necessary, set_smp_cross_call() and
set_handle_irq().

Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
This commit is contained in:
Jon Hunter 2016-06-07 16:12:30 +01:00 committed by Marc Zyngier
parent be45beb2df
commit d6ce564cea
1 changed files with 32 additions and 23 deletions
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55
drivers/irqchip/irq-gic.c
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@ -1032,14 +1032,11 @@ static const struct irq_domain_ops gic_irq_domain_ops = {
.unmap = gic_irq_domain_unmap,
};
static int __init __gic_init_bases(struct gic_chip_data *gic, int irq_start,
struct fwnode_handle *handle)
static int gic_init_bases(struct gic_chip_data *gic, int irq_start,
struct fwnode_handle *handle)
{
irq_hw_number_t hwirq_base;
int gic_irqs, irq_base, i, ret;
if (WARN_ON(!gic || gic->domain))
return -EINVAL;
int gic_irqs, irq_base, ret;
/* Initialize irq_chip */
gic->chip = gic_chip;
@ -1138,23 +1135,6 @@ static int __init __gic_init_bases(struct gic_chip_data *gic, int irq_start,
goto error;
}
if (gic == &gic_data[0]) {
/*
* Initialize the CPU interface map to all CPUs.
* It will be refined as each CPU probes its ID.
* This is only necessary for the primary GIC.
*/
for (i = 0; i < NR_GIC_CPU_IF; i++)
gic_cpu_map[i] = 0xff;
#ifdef CONFIG_SMP
set_smp_cross_call(gic_raise_softirq);
register_cpu_notifier(&gic_cpu_notifier);
#endif
set_handle_irq(gic_handle_irq);
if (static_key_true(&supports_deactivate))
pr_info("GIC: Using split EOI/Deactivate mode\n");
}
gic_dist_init(gic);
ret = gic_cpu_init(gic);
if (ret)
@ -1177,6 +1157,35 @@ static int __init __gic_init_bases(struct gic_chip_data *gic, int irq_start,
return ret;
}
static int __init __gic_init_bases(struct gic_chip_data *gic,
int irq_start,
struct fwnode_handle *handle)
{
int i;
if (WARN_ON(!gic || gic->domain))
return -EINVAL;
if (gic == &gic_data[0]) {
/*
* Initialize the CPU interface map to all CPUs.
* It will be refined as each CPU probes its ID.
* This is only necessary for the primary GIC.
*/
for (i = 0; i < NR_GIC_CPU_IF; i++)
gic_cpu_map[i] = 0xff;
#ifdef CONFIG_SMP
set_smp_cross_call(gic_raise_softirq);
register_cpu_notifier(&gic_cpu_notifier);
#endif
set_handle_irq(gic_handle_irq);
if (static_key_true(&supports_deactivate))
pr_info("GIC: Using split EOI/Deactivate mode\n");
}
return gic_init_bases(gic, irq_start, handle);
}
void __init gic_init(unsigned int gic_nr, int irq_start,
void __iomem *dist_base, void __iomem *cpu_base)
{