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Date: Tue, 21 Jul 2015 15:50:46 +0200
From: Tomeu Vizoso <tomeu.vizoso@...labora.com>
To: linux-kernel@...r.kernel.org
Cc: Stephen Warren <swarren@...dotorg.org>,
"Rafael J. Wysocki" <rjw@...ysocki.net>,
linux-arm-kernel@...ts.infradead.org,
Arnd Bergmann <arnd@...db.de>, Mark Brown <broonie@...nel.org>,
Tomeu Vizoso <tomeu.vizoso@...labora.com>
Subject: [RFC PATCH 04/16] Add DEVM_IOMAP()
Signed-off-by: Tomeu Vizoso <tomeu.vizoso@...labora.com>
---
drivers/base/devres.c | 56 ++++++++++++++++++++++++++++++++++++++++++++++++++
include/linux/device.h | 19 +++++++++++++++++
2 files changed, 75 insertions(+)
diff --git a/drivers/base/devres.c b/drivers/base/devres.c
index 5198ccd28123..6af1ca9fa804 100644
--- a/drivers/base/devres.c
+++ b/drivers/base/devres.c
@@ -8,7 +8,10 @@
*/
#include <linux/device.h>
+#include <linux/io.h>
#include <linux/module.h>
+#include <linux/of_address.h>
+#include <linux/platform_device.h>
#include <linux/slab.h>
#include "base.h"
@@ -1034,3 +1037,56 @@ int devm_resource_alloc(struct device *dev,
return 0;
}
EXPORT_SYMBOL_GPL(devm_resource_alloc);
+
+int devm_acquire_iomap(struct device *dev,
+ const struct devm_resource *resource)
+{
+ struct resource res, *resp = NULL;
+ void __iomem *vaddr;
+ void * __iomem *vaddrp;
+ int index, ret;
+
+ /* find mem resource from platform device */
+ if (dev->bus == &platform_bus_type) {
+ struct platform_device *pdev = to_platform_device(dev);
+
+ if (resource->name)
+ resp = platform_get_resource_byname(pdev,
+ IORESOURCE_MEM, resource->name);
+ else
+ resp = platform_get_resource(pdev,
+ IORESOURCE_MEM, resource->index);
+ }
+
+ /* try getting resource from device tree if that failed */
+ if (!resp && dev->of_node) {
+ if (resource->name)
+ index = of_property_match_string(dev->of_node,
+ "reg-names",
+ resource->name);
+ else
+ index = resource->index;
+
+ ret = of_address_to_resource(dev->of_node, index, &res);
+ if (ret)
+ return ret;
+ resp = &res;
+ }
+
+
+ if (resource->flags & DEVM_IOMAP_NOREQUEST) {
+ vaddr = devm_ioremap(dev, resp->start, resource_size(resp));
+ if (!vaddr)
+ return -EINVAL;
+ } else {
+ vaddr = devm_ioremap_resource(dev, resp);
+ if (IS_ERR(vaddr))
+ return PTR_ERR(vaddr);
+ }
+
+ vaddrp = dev_get_drvdata(dev) + resource->offset;
+ *vaddrp = vaddr;
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(devm_acquire_iomap);
diff --git a/include/linux/device.h b/include/linux/device.h
index c2bbee6b60ad..edcdc7a30114 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -687,6 +687,25 @@ extern int devm_resource_alloc(struct device *dev,
#define DEVM_ALLOC(_struct) \
{ .initfunc = devm_resource_alloc, .offset = sizeof(struct _struct), }
+extern int devm_acquire_iomap(struct device *dev,
+ const struct devm_resource *resource);
+
+#define DEVM_IOMAP_NOREQUEST 1
+
+#define DEVM_IOMAP(_struct, _member, _index, _flags) { \
+ .initfunc = devm_acquire_iomap, \
+ .offset = offsetof_t(struct _struct, _member, void __iomem *), \
+ .index = _index, \
+ .flags = _flags, \
+}
+
+#define DEVM_IOMAP_NAMED(_struct, _member, _name, _flags) { \
+ .initfunc = devm_acquire_iomap, \
+ .offset = offsetof_t(struct _struct, _member, void __iomem *), \
+ .name = _name, \
+ .flags = _flags, \
+}
+
void __iomem *devm_ioremap_resource(struct device *dev, struct resource *res);
/* allows to add/remove a custom action to devres stack */
--
2.4.3
--
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