ARM: EXYNOS: Add irq_domain support for interrupt combiner

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@secretlab.ca>
Signed-off-by: Thomas Abraham <thomas.abraham@linaro.org>
Acked-by: Rob Herring <rob.herring@calxeda.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>

1 files changed, 50 insertions, 38 deletions

diff --git a/arch/arm/mach-exynos/common.c b/arch/arm/mach-exynos/common.c
index 3302a8dca4e0..a688c17bc869 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>
@@ -399,6 +401,7 @@ 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)
@@ -411,14 +414,14 @@ 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);
 }
@@ -474,36 +477,58 @@ 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,
+};
+
+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);
+        }
 
-        /* Setup the Linux IRQ subsystem */
+        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));
         }
 }
 
@@ -516,7 +541,6 @@ 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;
@@ -528,12 +552,7 @@ 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.
@@ -545,17 +564,10 @@ void __init exynos4_init_irq(void)
 
 void __init exynos5_init_irq(void)
 {
-        int irq;
-
 #ifdef CONFIG_OF
         of_irq_init(exynos4_dt_irq_match);
 #endif
-
-        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.