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driver: add support for requesting resource by name 

this will allow to avoid issue with resource order

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Jean-Christophe PLAGNIOL-VILLARD 2012-10-17 15:05:14 +02:00 committed by Sascha Hauer
parent 87feda4eb1
commit d54f5b1b48
2 changed files with 61 additions and 0 deletions
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46
drivers/base/driver.c
View File

@ -252,6 +252,52 @@ void *dev_get_mem_region(struct device_d *dev, int num)
}
EXPORT_SYMBOL(dev_get_mem_region);
struct resource *dev_get_resource_by_name(struct device_d *dev,
const char *name)
{
int i;
for (i = 0; i < dev->num_resources; i++) {
struct resource *res = &dev->resource[i];
if (resource_type(res) != IORESOURCE_MEM)
continue;
if (!res->name)
continue;
if (!strcmp(name, res->name))
return res;
}
return NULL;
}
void *dev_get_mem_region_by_name(struct device_d *dev, const char *name)
{
struct resource *res;
res = dev_get_resource_by_name(dev, name);
if (!res)
return NULL;
return (void __force *)res->start;
}
EXPORT_SYMBOL(dev_get_mem_region_by_name);
void __iomem *dev_request_mem_region_by_name(struct device_d *dev, const char *name)
{
struct resource *res;
res = dev_get_resource_by_name(dev, name);
if (!res)
return NULL;
res = request_iomem_region(dev_name(dev), res->start, res->end);
if (!res)
return NULL;
return (void __force __iomem *)res->start;
}
EXPORT_SYMBOL(dev_request_mem_region_by_name);
void __iomem *dev_request_mem_region(struct device_d *dev, int num)
{
struct resource *res;

15
include/driver.h
View File

@ -192,6 +192,21 @@ static inline const char *dev_name(const struct device_d *dev)
return dev_id(dev);
}
/*
* get resource base 'name' for a device
*/
struct resource *dev_get_resource_by_name(struct device_d *dev,
const char *name);
/*
* get register base 'name' for a device
*/
void *dev_get_mem_region_by_name(struct device_d *dev, const char *name);
/*
* exlusively request register base 'name' for a device
*/
void __iomem *dev_request_mem_region_by_name(struct device_d *dev,
const char *name);
/*
* get register base 'num' for a device
*/