summaryrefslogtreecommitdiff
path: root/arch/arm/common/gic.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/arm/common/gic.c')
-rw-r--r--arch/arm/common/gic.c64
1 files changed, 46 insertions, 18 deletions
diff --git a/arch/arm/common/gic.c b/arch/arm/common/gic.c
index ada6359160eb..e6388dcd8cfa 100644
--- a/arch/arm/common/gic.c
+++ b/arch/arm/common/gic.c
@@ -146,9 +146,15 @@ static int gic_set_cpu(unsigned int irq, const struct cpumask *mask_val)
unsigned int shift = (irq % 4) * 8;
unsigned int cpu = cpumask_first(mask_val);
u32 val;
+ struct irq_desc *desc;
spin_lock(&irq_controller_lock);
- irq_desc[irq].node = cpu;
+ desc = irq_to_desc(irq);
+ if (desc == NULL) {
+ spin_unlock(&irq_controller_lock);
+ return -EINVAL;
+ }
+ desc->node = cpu;
val = readl(reg) & ~(0xff << shift);
val |= 1 << (cpu + shift);
writel(val, reg);
@@ -210,7 +216,7 @@ void __init gic_cascade_irq(unsigned int gic_nr, unsigned int irq)
void __init gic_dist_init(unsigned int gic_nr, void __iomem *base,
unsigned int irq_start)
{
- unsigned int max_irq, i;
+ unsigned int gic_irqs, irq_limit, i;
u32 cpumask = 1 << smp_processor_id();
if (gic_nr >= MAX_GIC_NR)
@@ -226,46 +232,49 @@ void __init gic_dist_init(unsigned int gic_nr, void __iomem *base,
/*
* Find out how many interrupts are supported.
- */
- max_irq = readl(base + GIC_DIST_CTR) & 0x1f;
- max_irq = (max_irq + 1) * 32;
-
- /*
* The GIC only supports up to 1020 interrupt sources.
- * Limit this to either the architected maximum, or the
- * platform maximum.
*/
- if (max_irq > max(1020, NR_IRQS))
- max_irq = max(1020, NR_IRQS);
+ gic_irqs = readl(base + GIC_DIST_CTR) & 0x1f;
+ gic_irqs = (gic_irqs + 1) * 32;
+ if (gic_irqs > 1020)
+ gic_irqs = 1020;
/*
* Set all global interrupts to be level triggered, active low.
*/
- for (i = 32; i < max_irq; i += 16)
+ for (i = 32; i < gic_irqs; i += 16)
writel(0, base + GIC_DIST_CONFIG + i * 4 / 16);
/*
* Set all global interrupts to this CPU only.
*/
- for (i = 32; i < max_irq; i += 4)
+ for (i = 32; i < gic_irqs; i += 4)
writel(cpumask, base + GIC_DIST_TARGET + i * 4 / 4);
/*
- * Set priority on all interrupts.
+ * Set priority on all global interrupts.
*/
- for (i = 0; i < max_irq; i += 4)
+ for (i = 32; i < gic_irqs; i += 4)
writel(0xa0a0a0a0, base + GIC_DIST_PRI + i * 4 / 4);
/*
- * Disable all interrupts.
+ * Disable all interrupts. Leave the PPI and SGIs alone
+ * as these enables are banked registers.
*/
- for (i = 0; i < max_irq; i += 32)
+ for (i = 32; i < gic_irqs; i += 32)
writel(0xffffffff, base + GIC_DIST_ENABLE_CLEAR + i * 4 / 32);
/*
+ * Limit number of interrupts registered to the platform maximum
+ */
+ irq_limit = gic_data[gic_nr].irq_offset + gic_irqs;
+ if (WARN_ON(irq_limit > NR_IRQS))
+ irq_limit = NR_IRQS;
+
+ /*
* Setup the Linux IRQ subsystem.
*/
- for (i = irq_start; i < gic_data[gic_nr].irq_offset + max_irq; i++) {
+ for (i = irq_start; i < irq_limit; i++) {
set_irq_chip(i, &gic_chip);
set_irq_chip_data(i, &gic_data[gic_nr]);
set_irq_handler(i, handle_level_irq);
@@ -277,11 +286,30 @@ void __init gic_dist_init(unsigned int gic_nr, void __iomem *base,
void __cpuinit gic_cpu_init(unsigned int gic_nr, void __iomem *base)
{
+ void __iomem *dist_base;
+ int i;
+
if (gic_nr >= MAX_GIC_NR)
BUG();
+ dist_base = gic_data[gic_nr].dist_base;
+ BUG_ON(!dist_base);
+
gic_data[gic_nr].cpu_base = base;
+ /*
+ * Deal with the banked PPI and SGI interrupts - disable all
+ * PPI interrupts, ensure all SGI interrupts are enabled.
+ */
+ writel(0xffff0000, dist_base + GIC_DIST_ENABLE_CLEAR);
+ writel(0x0000ffff, dist_base + GIC_DIST_ENABLE_SET);
+
+ /*
+ * Set priority on PPI and SGI interrupts
+ */
+ for (i = 0; i < 32; i += 4)
+ writel(0xa0a0a0a0, dist_base + GIC_DIST_PRI + i * 4 / 4);
+
writel(0xf0, base + GIC_CPU_PRIMASK);
writel(1, base + GIC_CPU_CTRL);
}