linux-kernel - [PATCH 3/9] lib: devres: provide new variants for devm_ioremap

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Date:   Thu, 29 Aug 2019 16:37:36 +0200
From:   Bartosz Golaszewski <brgl@...ev.pl>
To:     Jonathan Corbet <corbet@....net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Alban Bedel <albeu@...e.fr>,
        Linus Walleij <linus.walleij@...aro.org>,
        Arnd Bergmann <arnd@...db.de>,
        Geert Uytterhoeven <geert+renesas@...der.be>
Cc:     linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-gpio@...r.kernel.org, Julia Lawall <Julia.Lawall@...6.fr>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>
Subject: [PATCH 3/9] lib: devres: provide new variants for devm_ioremap_resource()

From: Bartosz Golaszewski <bgolaszewski@...libre.com>

Provide two new variants of devm_ioremap_resource() - one for nocache
and one for write-combined ioremap.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@...libre.com>
---
 .../driver-api/driver-model/devres.rst        |  2 ++
 include/linux/device.h                        |  4 +++
 lib/devres.c                                  | 29 +++++++++++++++++++
 3 files changed, 35 insertions(+)

diff --git a/Documentation/driver-api/driver-model/devres.rst b/Documentation/driver-api/driver-model/devres.rst
index 8e3087662daf..20c4be0389ab 100644
--- a/Documentation/driver-api/driver-model/devres.rst
+++ b/Documentation/driver-api/driver-model/devres.rst
@@ -316,6 +316,8 @@ IOMAP
   devm_ioremap_nocache()
   devm_ioremap_wc()
   devm_ioremap_resource() : checks resource, requests memory region, ioremaps
+  devm_ioremap_resource_nocache()
+  devm_ioremap_resource_wc()
   devm_platform_ioremap_resource() : calls devm_ioremap_resource() for platform device
   devm_iounmap()
   pcim_iomap()
diff --git a/include/linux/device.h b/include/linux/device.h
index 6717adee33f0..e8aa916e8eb2 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -710,6 +710,10 @@ extern void devm_free_pages(struct device *dev, unsigned long addr);
 
 void __iomem *devm_ioremap_resource(struct device *dev,
 				    const struct resource *res);
+void __iomem *devm_ioremap_resource_nocache(struct device *dev,
+					    const struct resource *res);
+void __iomem *devm_ioremap_resource_wc(struct device *dev,
+				       const struct resource *res);
 
 void __iomem *devm_of_iomap(struct device *dev,
 			    struct device_node *node, int index,
diff --git a/lib/devres.c b/lib/devres.c
index a14c727128c1..f1297bcc8891 100644
--- a/lib/devres.c
+++ b/lib/devres.c
@@ -169,6 +169,35 @@ void __iomem *devm_ioremap_resource(struct device *dev,
 }
 EXPORT_SYMBOL(devm_ioremap_resource);
 
+/**
+ * devm_ioremap_resource_nocache() - nocache variant of devm_ioremap_resource()
+ * @dev: generic device to handle the resource for
+ * @res: resource to be handled
+ *
+ * Returns a pointer to the remapped memory or an ERR_PTR() encoded error code
+ * on failure. Usage example:
+ */
+void __iomem *devm_ioremap_resource_nocache(struct device *dev,
+					    const struct resource *res)
+{
+	return __devm_ioremap_resource(dev, res, DEVM_IOREMAP_NC);
+}
+
+/**
+ * devm_ioremap_resource_wc() - write-combined variant of
+ *				devm_ioremap_resource()
+ * @dev: generic device to handle the resource for
+ * @res: resource to be handled
+ *
+ * Returns a pointer to the remapped memory or an ERR_PTR() encoded error code
+ * on failure. Usage example:
+ */
+void __iomem *devm_ioremap_resource_wc(struct device *dev,
+				       const struct resource *res)
+{
+	return __devm_ioremap_resource(dev, res, DEVM_IOREMAP_WC);
+}
+
 /*
  * devm_of_iomap - Requests a resource and maps the memory mapped IO
  *		   for a given device_node managed by a given device
-- 
2.21.0