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Date: Wed, 26 Nov 2014 15:14:01 -0600
From: Dave Gerlach <d-gerlach@...com>
To: <linux-arm-kernel@...ts.infradead.org>,
<linux-kernel@...r.kernel.org>, <linux-omap@...r.kernel.org>,
<linux-arch@...r.kernel.org>, <devicetree@...r.kernel.org>
CC: Russ Dill <russ.dill@...com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Arnd Bergmann <arnd@...db.de>,
Philipp Zabel <p.zabel@...gutronix.de>,
Shawn Guo <shawn.guo@...escale.com>,
Tony Lindgren <tony@...mide.com>, <Anson.Huang@...escale.com>,
Russ Dill <Russ.Dill@...com>, Dave Gerlach <d-gerlach@...com>
Subject: [RFC PATCH 2/2] lib: devres: Add exec versions of devm_ioremap_resource and friends
From: Russ Dill <Russ.Dill@...com>
Now that there is an _exec version of ioremap, add devm support for it.
Signed-off-by: Russ Dill <Russ.Dill@...com>
Signed-off-by: Dave Gerlach <d-gerlach@...com>
---
include/linux/device.h | 19 +++++++-
include/linux/io.h | 9 +++-
lib/devres.c | 125 +++++++++++++++++++++++++++++++++++++++++++++++--
3 files changed, 147 insertions(+), 6 deletions(-)
diff --git a/include/linux/device.h b/include/linux/device.h
index ce1f2160..d336465 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -635,7 +635,24 @@ extern unsigned long devm_get_free_pages(struct device *dev,
gfp_t gfp_mask, unsigned int order);
extern void devm_free_pages(struct device *dev, unsigned long addr);
-void __iomem *devm_ioremap_resource(struct device *dev, struct resource *res);
+void __iomem *__devm_ioremap_resource(struct device *dev, struct resource *res,
+ bool exec);
+static inline void __iomem *devm_ioremap_resource(struct device *dev,
+ struct resource *res)
+{
+ return __devm_ioremap_resource(dev, res, false);
+}
+void __iomem *devm_request_and_ioremap(struct device *dev,
+ struct resource *res);
+
+static inline void __iomem *devm_ioremap_exec_resource(struct device *dev,
+ struct resource *res)
+{
+ return __devm_ioremap_resource(dev, res, true);
+}
+
+void __iomem *devm_request_and_ioremap_exec(struct device *dev,
+ struct resource *res);
/* allows to add/remove a custom action to devres stack */
int devm_add_action(struct device *dev, void (*action)(void *), void *data);
diff --git a/include/linux/io.h b/include/linux/io.h
index d5fc9b8..0c6405a 100644
--- a/include/linux/io.h
+++ b/include/linux/io.h
@@ -61,9 +61,14 @@ static inline void devm_ioport_unmap(struct device *dev, void __iomem *addr)
#define IOMEM_ERR_PTR(err) (__force void __iomem *)ERR_PTR(err)
void __iomem *devm_ioremap(struct device *dev, resource_size_t offset,
- unsigned long size);
+ unsigned long size);
void __iomem *devm_ioremap_nocache(struct device *dev, resource_size_t offset,
- unsigned long size);
+ unsigned long size);
+void __iomem *devm_ioremap_exec(struct device *dev, resource_size_t offset,
+ unsigned long size);
+void __iomem *devm_ioremap_exec_nocache(struct device *dev,
+ resource_size_t offset,
+ unsigned long size);
void devm_iounmap(struct device *dev, void __iomem *addr);
int check_signature(const volatile void __iomem *io_addr,
const unsigned char *signature, int length);
diff --git a/lib/devres.c b/lib/devres.c
index f4a195a..f5d0eac 100644
--- a/lib/devres.c
+++ b/lib/devres.c
@@ -72,6 +72,64 @@ void __iomem *devm_ioremap_nocache(struct device *dev, resource_size_t offset,
EXPORT_SYMBOL(devm_ioremap_nocache);
/**
+ * devm_ioremap_exec - Managed ioremap_exec()
+ * @dev: Generic device to remap IO address for
+ * @offset: BUS offset to map
+ * @size: Size of map
+ *
+ * Managed ioremap_exec(). Map is automatically unmapped on driver detach.
+ */
+void __iomem *devm_ioremap_exec(struct device *dev, resource_size_t offset,
+ unsigned long size)
+{
+ void __iomem **ptr, *addr;
+
+ ptr = devres_alloc(devm_ioremap_release, sizeof(*ptr), GFP_KERNEL);
+ if (!ptr)
+ return NULL;
+
+ addr = ioremap_exec(offset, size);
+ if (addr) {
+ *ptr = addr;
+ devres_add(dev, ptr);
+ } else
+ devres_free(ptr);
+
+ return addr;
+}
+EXPORT_SYMBOL(devm_ioremap_exec);
+
+/**
+ * devm_ioremap_exec_nocache - Managed ioremap_exec_nocache()
+ * @dev: Generic device to remap IO address for
+ * @offset: BUS offset to map
+ * @size: Size of map
+ *
+ * Managed ioremap_exec_nocache(). Map is automatically unmapped on driver
+ * detach.
+ */
+void __iomem *devm_ioremap_exec_nocache(struct device *dev,
+ resource_size_t offset,
+ unsigned long size)
+{
+ void __iomem **ptr, *addr;
+
+ ptr = devres_alloc(devm_ioremap_release, sizeof(*ptr), GFP_KERNEL);
+ if (!ptr)
+ return NULL;
+
+ addr = ioremap_exec_nocache(offset, size);
+ if (addr) {
+ *ptr = addr;
+ devres_add(dev, ptr);
+ } else
+ devres_free(ptr);
+
+ return addr;
+}
+EXPORT_SYMBOL(devm_ioremap_exec_nocache);
+
+/**
* devm_iounmap - Managed iounmap()
* @dev: Generic device to unmap for
* @addr: Address to unmap
@@ -104,7 +162,8 @@ EXPORT_SYMBOL(devm_iounmap);
* if (IS_ERR(base))
* return PTR_ERR(base);
*/
-void __iomem *devm_ioremap_resource(struct device *dev, struct resource *res)
+void __iomem *__devm_ioremap_resource(struct device *dev, struct resource *res,
+ bool exec)
{
resource_size_t size;
const char *name;
@@ -125,7 +184,11 @@ void __iomem *devm_ioremap_resource(struct device *dev, struct resource *res)
return IOMEM_ERR_PTR(-EBUSY);
}
- if (res->flags & IORESOURCE_CACHEABLE)
+ if (exec && res->flags & IORESOURCE_CACHEABLE)
+ dest_ptr = devm_ioremap_exec(dev, res->start, size);
+ else if (exec)
+ dest_ptr = devm_ioremap_exec_nocache(dev, res->start, size);
+ else if (res->flags & IORESOURCE_CACHEABLE)
dest_ptr = devm_ioremap(dev, res->start, size);
else
dest_ptr = devm_ioremap_nocache(dev, res->start, size);
@@ -138,7 +201,63 @@ void __iomem *devm_ioremap_resource(struct device *dev, struct resource *res)
return dest_ptr;
}
-EXPORT_SYMBOL(devm_ioremap_resource);
+EXPORT_SYMBOL(__devm_ioremap_resource);
+
+/**
+ * devm_request_and_ioremap() - Check, request region, and ioremap resource
+ * @dev: Generic device to handle the resource for
+ * @res: resource to be handled
+ *
+ * Takes all necessary steps to ioremap a mem resource. Uses managed device, so
+ * everything is undone on driver detach. Checks arguments, so you can feed
+ * it the result from e.g. platform_get_resource() directly. Returns the
+ * remapped pointer or NULL on error. Usage example:
+ *
+ * res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ * base = devm_request_and_ioremap(&pdev->dev, res);
+ * if (!base)
+ * return -EADDRNOTAVAIL;
+ */
+void __iomem *devm_request_and_ioremap(struct device *device,
+ struct resource *res)
+{
+ void __iomem *dest_ptr;
+
+ dest_ptr = devm_ioremap_resource(device, res);
+ if (IS_ERR(dest_ptr))
+ return NULL;
+
+ return dest_ptr;
+}
+EXPORT_SYMBOL(devm_request_and_ioremap);
+
+/**
+ * devm_request_and_ioremap_exec() - Check, request region, and ioremap resource
+ * @dev: Generic device to handle the resource for
+ * @res: resource to be handled
+ *
+ * Takes all necessary steps to ioremap a mem resource. Uses managed device, so
+ * everything is undone on driver detach. Checks arguments, so you can feed
+ * it the result from e.g. platform_get_resource() directly. Returns the
+ * remapped pointer or NULL on error. Usage example:
+ *
+ * res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ * base = devm_request_and_ioremap_exec(&pdev->dev, res);
+ * if (!base)
+ * return -EADDRNOTAVAIL;
+ */
+void __iomem *devm_request_and_ioremap_exec(struct device *device,
+ struct resource *res)
+{
+ void __iomem *dest_ptr;
+
+ dest_ptr = devm_ioremap_exec_resource(device, res);
+ if (IS_ERR(dest_ptr))
+ return NULL;
+
+ return dest_ptr;
+}
+EXPORT_SYMBOL(devm_request_and_ioremap_exec);
#ifdef CONFIG_HAS_IOPORT_MAP
/*
--
2.1.0
--
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