diff --git a/drivers/irqchip/irq-gic-common.c b/drivers/irqchip/irq-gic-common.c index 9448e391cb71..44a077f3a4a2 100644 --- a/drivers/irqchip/irq-gic-common.c +++ b/drivers/irqchip/irq-gic-common.c @@ -21,6 +21,17 @@ #include "irq-gic-common.h" +void gic_enable_quirks(u32 iidr, const struct gic_quirk *quirks, + void *data) +{ + for (; quirks->desc; quirks++) { + if (quirks->iidr != (quirks->mask & iidr)) + continue; + quirks->init(data); + pr_info("GIC: enabling workaround for %s\n", quirks->desc); + } +} + int gic_configure_irq(unsigned int irq, unsigned int type, void __iomem *base, void (*sync_access)(void)) { diff --git a/drivers/irqchip/irq-gic-common.h b/drivers/irqchip/irq-gic-common.h index 35a9884778bd..fff697db8e22 100644 --- a/drivers/irqchip/irq-gic-common.h +++ b/drivers/irqchip/irq-gic-common.h @@ -20,10 +20,19 @@ #include #include +struct gic_quirk { + const char *desc; + void (*init)(void *data); + u32 iidr; + u32 mask; +}; + int gic_configure_irq(unsigned int irq, unsigned int type, void __iomem *base, void (*sync_access)(void)); void gic_dist_config(void __iomem *base, int gic_irqs, void (*sync_access)(void)); void gic_cpu_config(void __iomem *base, void (*sync_access)(void)); +void gic_enable_quirks(u32 iidr, const struct gic_quirk *quirks, + void *data); #endif /* _IRQ_GIC_COMMON_H */ diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c index 549e71670f23..82622afc916b 100644 --- a/drivers/irqchip/irq-gic-v3-its.c +++ b/drivers/irqchip/irq-gic-v3-its.c @@ -37,6 +37,8 @@ #include #include +#include "irq-gic-common.h" + #define ITS_FLAGS_CMDQ_NEEDS_FLUSHING (1 << 0) #define RDIST_FLAGS_PROPBASE_NEEDS_FLUSHING (1 << 0) @@ -1375,6 +1377,18 @@ static int its_force_quiescent(void __iomem *base) } } +static const struct gic_quirk its_quirks[] = { + { + } +}; + +static void its_enable_quirks(struct its_node *its) +{ + u32 iidr = readl_relaxed(its->base + GITS_IIDR); + + gic_enable_quirks(iidr, its_quirks, its); +} + static int its_probe(struct device_node *node, struct irq_domain *parent) { struct resource res; @@ -1433,6 +1447,8 @@ static int its_probe(struct device_node *node, struct irq_domain *parent) } its->cmd_write = its->cmd_base; + its_enable_quirks(its); + err = its_alloc_tables(node->full_name, its); if (err) goto out_free_cmd;