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path: root/drivers/amba/bus.c
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Diffstat (limited to 'drivers/amba/bus.c')
-rw-r--r--drivers/amba/bus.c26
1 files changed, 21 insertions, 5 deletions
diff --git a/drivers/amba/bus.c b/drivers/amba/bus.c
index 3d763fdf99b..768d973d0de 100644
--- a/drivers/amba/bus.c
+++ b/drivers/amba/bus.c
@@ -204,6 +204,7 @@ static void amba_device_release(struct device *dev)
int amba_device_register(struct amba_device *dev, struct resource *parent)
{
u32 pid, cid;
+ u32 size;
void __iomem *tmp;
int i, ret;
@@ -219,16 +220,25 @@ int amba_device_register(struct amba_device *dev, struct resource *parent)
if (ret)
goto err_out;
- tmp = ioremap(dev->res.start, SZ_4K);
+ /*
+ * Dynamically calculate the size of the resource
+ * and use this for iomap
+ */
+ size = resource_size(&dev->res);
+ tmp = ioremap(dev->res.start, size);
if (!tmp) {
ret = -ENOMEM;
goto err_release;
}
+ /*
+ * Read pid and cid based on size of resource
+ * they are located at end of region
+ */
for (pid = 0, i = 0; i < 4; i++)
- pid |= (readl(tmp + 0xfe0 + 4 * i) & 255) << (i * 8);
+ pid |= (readl(tmp + size - 0x20 + 4 * i) & 255) << (i * 8);
for (cid = 0, i = 0; i < 4; i++)
- cid |= (readl(tmp + 0xff0 + 4 * i) & 255) << (i * 8);
+ cid |= (readl(tmp + size - 0x10 + 4 * i) & 255) << (i * 8);
iounmap(tmp);
@@ -343,11 +353,14 @@ amba_find_device(const char *busid, struct device *parent, unsigned int id,
int amba_request_regions(struct amba_device *dev, const char *name)
{
int ret = 0;
+ u32 size;
if (!name)
name = dev->dev.driver->name;
- if (!request_mem_region(dev->res.start, SZ_4K, name))
+ size = resource_size(&dev->res);
+
+ if (!request_mem_region(dev->res.start, size, name))
ret = -EBUSY;
return ret;
@@ -361,7 +374,10 @@ int amba_request_regions(struct amba_device *dev, const char *name)
*/
void amba_release_regions(struct amba_device *dev)
{
- release_mem_region(dev->res.start, SZ_4K);
+ u32 size;
+
+ size = resource_size(&dev->res);
+ release_mem_region(dev->res.start, size);
}
EXPORT_SYMBOL(amba_driver_register);