irqchip: exynos: allocate combiner_data dynamically

The number of combiners on a given SoC is a platform specific
constant, and we cannot encode this number on a multiplatform
kernel since the header file defining it is not available.

Allocating the structure dynamically ends up cleaner anyway
since we keep all the data local.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 23 insertions, 13 deletions

diff --git a/drivers/irqchip/exynos-combiner.c b/drivers/irqchip/exynos-combiner.c
index d8683836ee1e..7fcdeee869ce 100644
--- a/drivers/irqchip/exynos-combiner.c
+++ b/drivers/irqchip/exynos-combiner.c
@@ -12,6 +12,7 @@
 #include <linux/export.h>
 #include <linux/init.h>
 #include <linux/io.h>
+#include <linux/slab.h>
 #include <linux/irqdomain.h>
 #include <linux/of_address.h>
 #include <linux/of_irq.h>
@@ -37,7 +38,6 @@ struct combiner_chip_data {
 };
 
 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)
 {
@@ -114,26 +114,26 @@ static struct irq_chip combiner_chip = {
 #endif
 };
 
-static void __init combiner_cascade_irq(unsigned int combiner_nr,
+static void __init combiner_cascade_irq(struct combiner_chip_data *combiner_data,
                                         unsigned int irq)
 {
-        if (irq_set_handler_data(irq, &combiner_data[combiner_nr]) != 0)
+        if (irq_set_handler_data(irq, combiner_data) != 0)
                 BUG();
         irq_set_chained_handler(irq, combiner_handle_cascade_irq);
 }
 
-static void __init combiner_init_one(unsigned int combiner_nr,
+static void __init combiner_init_one(struct combiner_chip_data *combiner_data,
+                                     unsigned int combiner_nr,
                                      void __iomem *base, unsigned int irq)
 {
-        combiner_data[combiner_nr].base = base;
-        combiner_data[combiner_nr].irq_offset = irq_find_mapping(
+        combiner_data->base = base;
+        combiner_data->irq_offset = irq_find_mapping(
                 combiner_irq_domain, combiner_nr * IRQ_IN_COMBINER);
-        combiner_data[combiner_nr].irq_mask = 0xff << ((combiner_nr % 4) << 3);
-        combiner_data[combiner_nr].parent_irq = irq;
+        combiner_data->irq_mask = 0xff << ((combiner_nr % 4) << 3);
+        combiner_data->parent_irq = irq;
 
         /* Disable all interrupts */
-        __raw_writel(combiner_data[combiner_nr].irq_mask,
-                     base + COMBINER_ENABLE_CLEAR);
+        __raw_writel(combiner_data->irq_mask, base + COMBINER_ENABLE_CLEAR);
 }
 
 #ifdef CONFIG_OF
@@ -168,6 +168,8 @@ static int combiner_irq_domain_xlate(struct irq_domain *d,
 static int combiner_irq_domain_map(struct irq_domain *d, unsigned int irq,
                                    irq_hw_number_t hw)
 {
+        struct combiner_chip_data *combiner_data = d->host_data;
+
         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);
@@ -202,6 +204,7 @@ void __init combiner_init(void __iomem *combiner_base,
 {
         int i, irq, irq_base;
         unsigned int nr_irq;
+        struct combiner_chip_data *combiner_data;
 
         nr_irq = max_nr * IRQ_IN_COMBINER;
 
@@ -211,8 +214,14 @@ void __init combiner_init(void __iomem *combiner_base,
                 pr_warning("%s: irq desc alloc failed. Continuing with %d as linux irq base\n", __func__, irq_base);
         }
 
+        combiner_data = kcalloc(max_nr, sizeof (*combiner_data), GFP_KERNEL);
+        if (!combiner_data) {
+                pr_warning("%s: could not allocate combiner data\n", __func__);
+                return;
+        }
+
         combiner_irq_domain = irq_domain_add_legacy(np, nr_irq, irq_base, 0,
-                                &combiner_irq_domain_ops, &combiner_data);
+                                &combiner_irq_domain_ops, combiner_data);
         if (WARN_ON(!combiner_irq_domain)) {
                 pr_warning("%s: irq domain init failed\n", __func__);
                 return;
@@ -227,8 +236,9 @@ void __init combiner_init(void __iomem *combiner_base,
                 if (np)
                         irq = irq_of_parse_and_map(np, i);
 #endif
-                combiner_init_one(i, combiner_base + (i >> 2) * 0x10, irq);
-                combiner_cascade_irq(i, irq);
+                combiner_init_one(&combiner_data[i], i,
+                                  combiner_base + (i >> 2) * 0x10, irq);
+                combiner_cascade_irq(&combiner_data[i], irq);
         }
 }