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irqchip: vf610-mscm: Support NVIC parent chip

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Support the NVIC interrupt controller as node parent of the MSCM
interrupt router. On the dual-core variants of Vybird (VF6xx), the
NVIC interrupt controller is used by the Cortex-M4. To support
running Linux on this core too, MSCM needs NVIC parent support too.

Signed-off-by: Stefan Agner <[email protected]>
Cc: [email protected]
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Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Thomas Gleixner <[email protected]>
This commit is contained in:
Stefan Agner 2015-05-16 11:44:17 +02:00 • committed by Thomas Gleixner
commit b5cc5cbc11
1 changed files with 17 additions and 6 deletions
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23
drivers/irqchip/irq-vf610-mscm-ir.c
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@ -47,6 +47,7 @@ struct vf610_mscm_ir_chip_data {
void __iomem *mscm_ir_base;
u16 cpu_mask;
u16 saved_irsprc[MSCM_IRSPRC_NUM];
bool is_nvic;
};
static struct vf610_mscm_ir_chip_data *mscm_ir_data;
@ -101,7 +102,7 @@ static void vf610_mscm_ir_enable(struct irq_data *data)
writew_relaxed(chip_data->cpu_mask,
chip_data->mscm_ir_base + MSCM_IRSPRC(hwirq));
irq_chip_unmask_parent(data);
irq_chip_enable_parent(data);
}
static void vf610_mscm_ir_disable(struct irq_data *data)
@ -111,7 +112,7 @@ static void vf610_mscm_ir_disable(struct irq_data *data)
writew_relaxed(0x0, chip_data->mscm_ir_base + MSCM_IRSPRC(hwirq));
irq_chip_mask_parent(data);
irq_chip_disable_parent(data);
}
static struct irq_chip vf610_mscm_ir_irq_chip = {
@ -143,10 +144,17 @@ static int vf610_mscm_ir_domain_alloc(struct irq_domain *domain, unsigned int vi
domain->host_data);
gic_data.np = domain->parent->of_node;
gic_data.args_count = 3;
gic_data.args[0] = GIC_SPI;
gic_data.args[1] = irq_data->args[0];
gic_data.args[2] = irq_data->args[1];
if (mscm_ir_data->is_nvic) {
gic_data.args_count = 1;
gic_data.args[0] = irq_data->args[0];
} else {
gic_data.args_count = 3;
gic_data.args[0] = GIC_SPI;
gic_data.args[1] = irq_data->args[0];
gic_data.args[2] = irq_data->args[1];
}
return irq_domain_alloc_irqs_parent(domain, virq, nr_irqs, &gic_data);
}
@ -199,6 +207,9 @@ static int __init vf610_mscm_ir_of_init(struct device_node *node,
goto out_unmap;
}
if (of_device_is_compatible(domain->parent->of_node, "arm,armv7m-nvic"))
mscm_ir_data->is_nvic = true;
cpu_pm_register_notifier(&mscm_ir_notifier_block);
return 0;