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Message-Id: <1379510692-32435-6-git-send-email-treding@nvidia.com>
Date: Wed, 18 Sep 2013 15:24:47 +0200
From: Thierry Reding <thierry.reding@...il.com>
To: Rob Herring <rob.herring@...xeda.com>,
Grant Likely <grant.likely@...aro.org>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Thomas Gleixner <tglx@...utronix.de>
Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>,
Ralf Baechle <ralf@...ux-mips.org>,
Russell King <linux@....linux.org.uk>,
devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
linux-mips@...ux-mips.org, linuxppc-dev@...ts.ozlabs.org,
sparclinux@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2 05/10] of/irq: Introduce __irq_of_parse_and_map()
This is a version of irq_of_parse_and_map() that propagates the precise
error code instead of returning 0 for all errors. It will be used in
subsequent patches to allow further propagation of error codes.
To avoid code duplication, implement irq_of_parse_and_map() as a static
inline wrapper around the new __irq_of_parse_and_map(). Note that this
is somewhat complicated by the fact that SPARC implement its own version
of irq_of_parse_and_map(). Make SPARC implement __irq_of_parse_and_map()
so that the static inline wrapper can be used on all platforms.
Signed-off-by: Thierry Reding <treding@...dia.com>
---
Changes in v2:
- rename of_irq_get() to __irq_of_parse_and_map()
arch/sparc/kernel/of_device_common.c | 12 ++++++++----
drivers/of/irq.c | 18 ++++++++++++------
include/linux/of_irq.h | 19 ++++++++++++++-----
3 files changed, 34 insertions(+), 15 deletions(-)
diff --git a/arch/sparc/kernel/of_device_common.c b/arch/sparc/kernel/of_device_common.c
index de199bf..a69559f 100644
--- a/arch/sparc/kernel/of_device_common.c
+++ b/arch/sparc/kernel/of_device_common.c
@@ -11,16 +11,20 @@
#include "of_device_common.h"
-unsigned int irq_of_parse_and_map(struct device_node *node, int index)
+int __irq_of_parse_and_map(struct device_node *node, unsigned int index,
+ unsigned int *virqp)
{
struct platform_device *op = of_find_device_by_node(node);
if (!op || index >= op->archdata.num_irqs)
- return 0;
+ return !op ? -ENODEV : -EINVAL;
- return op->archdata.irqs[index];
+ if (virqp)
+ *virqp = op->archdata.irqs[index];
+
+ return 0;
}
-EXPORT_SYMBOL(irq_of_parse_and_map);
+EXPORT_SYMBOL(__irq_of_parse_and_map);
int of_address_to_resource(struct device_node *node, int index,
struct resource *r)
diff --git a/drivers/of/irq.c b/drivers/of/irq.c
index 5f44388..6ad46fd 100644
--- a/drivers/of/irq.c
+++ b/drivers/of/irq.c
@@ -27,24 +27,30 @@
#include <linux/slab.h>
/**
- * irq_of_parse_and_map - Parse and map an interrupt into linux virq space
+ * __irq_of_parse_and_map - Parse and map an interrupt into linux virq space
* @dev: Device node of the device whose interrupt is to be mapped
* @index: Index of the interrupt to map
+ * @virqp: Linux interrupt number filled by this function
*
* This function is a wrapper that chains of_irq_map_one() and
* irq_create_of_mapping() to make things easier to callers
+ *
+ * Returns 0 on success or a negative error code on failure.
*/
-unsigned int irq_of_parse_and_map(struct device_node *dev, int index)
+int __irq_of_parse_and_map(struct device_node *dev, unsigned int index,
+ unsigned int *virqp)
{
struct of_irq oirq;
+ int ret;
- if (of_irq_map_one(dev, index, &oirq))
- return 0;
+ ret = of_irq_map_one(dev, index, &oirq);
+ if (ret)
+ return ret;
return irq_create_of_mapping(oirq.controller, oirq.specifier,
- oirq.size);
+ oirq.size, virqp);
}
-EXPORT_SYMBOL_GPL(irq_of_parse_and_map);
+EXPORT_SYMBOL_GPL(__irq_of_parse_and_map);
/**
* of_irq_find_parent - Given a device node, find its interrupt parent node
diff --git a/include/linux/of_irq.h b/include/linux/of_irq.h
index 138266d..11da949 100644
--- a/include/linux/of_irq.h
+++ b/include/linux/of_irq.h
@@ -11,11 +11,12 @@ struct of_irq;
#include <linux/of.h>
/*
- * irq_of_parse_and_map() is used by all OF enabled platforms; but SPARC
+ * __irq_of_parse_and_map() is used by all OF enabled platforms; but SPARC
* implements it differently. However, the prototype is the same for all,
* so declare it here regardless of the CONFIG_OF_IRQ setting.
*/
-extern unsigned int irq_of_parse_and_map(struct device_node *node, int index);
+extern int __irq_of_parse_and_map(struct device_node *node, unsigned int index,
+ unsigned int *virqp);
#if defined(CONFIG_OF_IRQ)
/**
@@ -78,10 +79,11 @@ extern void of_irq_init(const struct of_device_id *matches);
#endif /* CONFIG_OF_IRQ */
#else /* !CONFIG_OF */
-static inline unsigned int irq_of_parse_and_map(struct device_node *dev,
- int index)
+static inline int __irq_of_parse_and_map(struct device_node *dev,
+ unsigned int index,
+ unsigned int *virqp)
{
- return 0;
+ return -ENOSYS;
}
static inline void *of_irq_find_parent(struct device_node *child)
@@ -90,4 +92,11 @@ static inline void *of_irq_find_parent(struct device_node *child)
}
#endif /* !CONFIG_OF */
+static inline unsigned int irq_of_parse_and_map(struct device_node *node,
+ unsigned int index)
+{
+ unsigned int irq;
+ return (__irq_of_parse_and_map(node, index, &irq) < 0) ? 0 : irq;
+}
+
#endif /* __OF_IRQ_H */
--
1.8.4
--
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