irqchip: vf610-mscm: Support NVIC parent chip

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 <stefan@agner.ch>
Cc: marc.zyngier@arm.com
Cc: linux@arm.linux.org.uk
Cc: u.kleine-koenig@pengutronix.de
Cc: olof@lixom.net
Cc: arnd@arndb.de
Cc: daniel.lezcano@linaro.org
Cc: mark.rutland@arm.com
Cc: pawel.moll@arm.com
Cc: robh+dt@kernel.org
Cc: ijc+devicetree@hellion.org.uk
Cc: galak@codeaurora.org
Cc: mcoquelin.stm32@gmail.com
Cc: linux-arm-kernel@lists.infradead.org
Cc: shawn.guo@linaro.org
Cc: kernel@pengutronix.de
Cc: jason@lakedaemon.net
Link: http://lkml.kernel.org/r/1431769465-26867-6-git-send-email-stefan@agner.ch
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 17 insertions, 6 deletions

diff --git a/drivers/irqchip/irq-vf610-mscm-ir.c b/drivers/irqchip/irq-vf610-mscm-ir.c
index 9521057d4744..b932ecb7b730 100644
--- a/drivers/irqchip/irq-vf610-mscm-ir.c
+++ b/drivers/irqchip/irq-vf610-mscm-ir.c
@@ -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;