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| author | Bartosz Golaszewski <bgolaszewski@baylibre.com> | 2019-10-22 10:43:13 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-11-05 18:32:21 +0100 |
| commit | b873af620e58863b70ae9cf97f6fab4cf4c544af (patch) | |
| tree | 11d74bd61433e6949461435d450b1819c9de4218 | |
| parent | 6e924822752cb1664fa8f76cb9c0927490bca139 (diff) | |
| download | lwn-b873af620e58863b70ae9cf97f6fab4cf4c544af.tar.gz lwn-b873af620e58863b70ae9cf97f6fab4cf4c544af.zip | |
lib: devres: provide devm_ioremap_resource_wc()
Provide a variant of devm_ioremap_resource() for write-combined ioremap.
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Link: https://lore.kernel.org/r/20191022084318.22256-4-brgl@bgdev.pl
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | Documentation/driver-api/driver-model/devres.rst | 1 | ||||
| -rw-r--r-- | include/linux/device.h | 2 | ||||
| -rw-r--r-- | lib/devres.c | 15 |
3 files changed, 18 insertions, 0 deletions
diff --git a/Documentation/driver-api/driver-model/devres.rst b/Documentation/driver-api/driver-model/devres.rst index 8e3087662daf..e605bb9df6e1 100644 --- a/Documentation/driver-api/driver-model/devres.rst +++ b/Documentation/driver-api/driver-model/devres.rst @@ -316,6 +316,7 @@ IOMAP devm_ioremap_nocache() devm_ioremap_wc() devm_ioremap_resource() : checks resource, requests memory region, ioremaps + 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 d1bcc8f122f6..f05c5b92e61f 100644 --- a/include/linux/device.h +++ b/include/linux/device.h @@ -962,6 +962,8 @@ 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_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..97fb44e5b4d6 100644 --- a/lib/devres.c +++ b/lib/devres.c @@ -169,6 +169,21 @@ void __iomem *devm_ioremap_resource(struct device *dev, } EXPORT_SYMBOL(devm_ioremap_resource); +/** + * 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 |