Add irq_domain support for hardware interrupts of the interrupt combiner.
The hardware interrupts of all the instances of the combiner are grouped
in a single irq_domain.
Cc: Grant Likely <grant.likely@xxxxxxxxxxxx>
Signed-off-by: Thomas Abraham <thomas.abraham@xxxxxxxxxx>
Acked-by: Rob Herring <rob.herring@xxxxxxxxxxx>
---
arch/arm/mach-exynos/common.c | 87 +++++++++++++++++++++++-----------------
1 files changed, 50 insertions(+), 37 deletions(-)
diff --git a/arch/arm/mach-exynos/common.c b/arch/arm/mach-exynos/common.c
index 85ed8b5..7518945 100644
--- a/arch/arm/mach-exynos/common.c
+++ b/arch/arm/mach-exynos/common.c
@@ -19,6 +19,8 @@
#include <linux/serial_core.h>
#include <linux/of.h>
#include <linux/of_irq.h>
+#include <linux/export.h>
+#include <linux/irqdomain.h>
#include <asm/proc-fns.h>
#include <asm/exception.h>
@@ -394,6 +396,7 @@ struct combiner_chip_data {
void __iomem *base;
};
+static struct irq_domain *combiner_irq_domain;
static struct combiner_chip_data combiner_data[MAX_COMBINER_NR];
static inline void __iomem *combiner_base(struct irq_data *data)
@@ -406,14 +409,14 @@ static inline void __iomem *combiner_base(struct irq_data *data)
static void combiner_mask_irq(struct irq_data *data)
{
- u32 mask = 1 << (data->irq % 32);
+ u32 mask = 1 << (data->hwirq % 32);
__raw_writel(mask, combiner_base(data) + COMBINER_ENABLE_CLEAR);
}
static void combiner_unmask_irq(struct irq_data *data)
{
- u32 mask = 1 << (data->irq % 32);
+ u32 mask = 1 << (data->hwirq % 32);
__raw_writel(mask, combiner_base(data) + COMBINER_ENABLE_SET);
}
@@ -469,36 +472,59 @@ static void __init combiner_cascade_irq(unsigned int combiner_nr, unsigned int i
irq_set_chained_handler(irq, combiner_handle_cascade_irq);
}
-static void __init combiner_init(unsigned int combiner_nr, void __iomem *base,
- unsigned int irq_start)
+static void __init combiner_init_one(unsigned int combiner_nr,
+ void __iomem *base)
{
- unsigned int i;
- unsigned int max_nr;
-
- if (soc_is_exynos5250())
- max_nr = EXYNOS5_MAX_COMBINER_NR;
- else
- max_nr = EXYNOS4_MAX_COMBINER_NR;
-
- if (combiner_nr >= max_nr)
- BUG();
-
combiner_data[combiner_nr].base = base;
- combiner_data[combiner_nr].irq_offset = irq_start;
+ combiner_data[combiner_nr].irq_offset = irq_find_mapping(
+ combiner_irq_domain, combiner_nr * MAX_IRQ_IN_COMBINER);
combiner_data[combiner_nr].irq_mask = 0xff << ((combiner_nr % 4) << 3);
/* Disable all interrupts */
__raw_writel(combiner_data[combiner_nr].irq_mask,
base + COMBINER_ENABLE_CLEAR);
+}
+
+static int combiner_irq_domain_map(struct irq_domain *d, unsigned int irq,
+ irq_hw_number_t hw)
+{
+ irq_set_chip_and_handler(irq, &combiner_chip, handle_level_irq);
+ irq_set_chip_data(irq, &combiner_data[hw >> 3]);
+ set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
+ return 0;
+}
+
+static struct irq_domain_ops combiner_irq_domain_ops = {
+ .map = combiner_irq_domain_map,
+};
- /* Setup the Linux IRQ subsystem */
+void __init combiner_init(void __iomem *combiner_base, struct device_node *np)
+{
+ int i, irq_base;
+ unsigned int max_nr, nr_irq;
+
+ max_nr = soc_is_exynos5250() ? EXYNOS5_MAX_COMBINER_NR :
+ EXYNOS4_MAX_COMBINER_NR;
+ nr_irq = max_nr * MAX_IRQ_IN_COMBINER;
+
+ irq_base = irq_alloc_descs(COMBINER_IRQ(0, 0), 1, nr_irq, 0);
+ if (IS_ERR_VALUE(irq_base)) {
+ irq_base = COMBINER_IRQ(0, 0);
+ pr_warning("%s: irq desc alloc failed. Continuing with %d as "
+ "linux irq base\n", __func__, irq_base);
+ }
+
+ combiner_irq_domain = irq_domain_add_legacy(np, nr_irq, irq_base, 0,
+ &combiner_irq_domain_ops, &combiner_data);
+ if (WARN_ON(!combiner_irq_domain)) {
+ pr_warning("%s: irq domain init failed\n", __func__);
+ return;
+ }
- for (i = irq_start; i < combiner_data[combiner_nr].irq_offset
- + MAX_IRQ_IN_COMBINER; i++) {
- irq_set_chip_and_handler(i, &combiner_chip, handle_level_irq);
- irq_set_chip_data(i, &combiner_data[combiner_nr]);
- set_irq_flags(i, IRQF_VALID | IRQF_PROBE);
+ for (i = 0; i < max_nr; i++) {
+ combiner_init_one(i, combiner_base + (i >> 2) * 0x10);
+ combiner_cascade_irq(i, IRQ_SPI(i));
}
}
@@ -511,7 +537,6 @@ static const struct of_device_id exynos4_dt_irq_match[] = {
void __init exynos4_init_irq(void)
{
- int irq;
unsigned int gic_bank_offset;
gic_bank_offset = soc_is_exynos4412() ? 0x4000 : 0x8000;
@@ -523,12 +548,7 @@ void __init exynos4_init_irq(void)
of_irq_init(exynos4_dt_irq_match);
#endif
- for (irq = 0; irq < EXYNOS4_MAX_COMBINER_NR; irq++) {
-
- combiner_init(irq, (void __iomem *)S5P_VA_COMBINER(irq),
- COMBINER_IRQ(irq, 0));
- combiner_cascade_irq(irq, IRQ_SPI(irq));
- }
+ combiner_init(S5P_VA_COMBINER_BASE, NULL);
/*
* The parameters of s5p_init_irq() are for VIC init.
@@ -540,15 +560,8 @@ void __init exynos4_init_irq(void)
void __init exynos5_init_irq(void)
{
- int irq;
-
gic_init(0, IRQ_PPI(0), S5P_VA_GIC_DIST, S5P_VA_GIC_CPU);
-
- for (irq = 0; irq < EXYNOS5_MAX_COMBINER_NR; irq++) {
- combiner_init(irq, (void __iomem *)S5P_VA_COMBINER(irq),
- COMBINER_IRQ(irq, 0));
- combiner_cascade_irq(irq, IRQ_SPI(irq));
- }
+ combiner_init(S5P_VA_COMBINER_BASE, NULL);
/*
* The parameters of s5p_init_irq() are for VIC init.
--
1.6.6.rc2
--
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