diff options
Diffstat (limited to 'arch/arm/common/gic.c')
| -rw-r--r-- | arch/arm/common/gic.c | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/arch/arm/common/gic.c b/arch/arm/common/gic.c index 337741f734a..7dfa9a85bc0 100644 --- a/arch/arm/common/gic.c +++ b/arch/arm/common/gic.c @@ -108,6 +108,51 @@ static void gic_unmask_irq(unsigned int irq) spin_unlock(&irq_controller_lock); } +static int gic_set_type(unsigned int irq, unsigned int type) +{ + void __iomem *base = gic_dist_base(irq); + unsigned int gicirq = gic_irq(irq); + u32 enablemask = 1 << (gicirq % 32); + u32 enableoff = (gicirq / 32) * 4; + u32 confmask = 0x2 << ((gicirq % 16) * 2); + u32 confoff = (gicirq / 16) * 4; + bool enabled = false; + u32 val; + + /* Interrupt configuration for SGIs can't be changed */ + if (gicirq < 16) + return -EINVAL; + + if (type != IRQ_TYPE_LEVEL_HIGH && type != IRQ_TYPE_EDGE_RISING) + return -EINVAL; + + spin_lock(&irq_controller_lock); + + val = readl(base + GIC_DIST_CONFIG + confoff); + if (type == IRQ_TYPE_LEVEL_HIGH) + val &= ~confmask; + else if (type == IRQ_TYPE_EDGE_RISING) + val |= confmask; + + /* + * As recommended by the spec, disable the interrupt before changing + * the configuration + */ + if (readl(base + GIC_DIST_ENABLE_SET + enableoff) & enablemask) { + writel(enablemask, base + GIC_DIST_ENABLE_CLEAR + enableoff); + enabled = true; + } + + writel(val, base + GIC_DIST_CONFIG + confoff); + + if (enabled) + writel(enablemask, base + GIC_DIST_ENABLE_SET + enableoff); + + spin_unlock(&irq_controller_lock); + + return 0; +} + #ifdef CONFIG_SMP static int gic_set_cpu(unsigned int irq, const struct cpumask *mask_val) { @@ -161,6 +206,7 @@ static struct irq_chip gic_chip = { .ack = gic_ack_irq, .mask = gic_mask_irq, .unmask = gic_unmask_irq, + .set_type = gic_set_type, #ifdef CONFIG_SMP .set_affinity = gic_set_cpu, #endif |