linux-imx

 *

 *  res = platform_get_resource(pdev, IORESOURCE_MEM, 0);

 *  base = devm_ioremap_resource(&pdev->dev, res);

 *  if (IS_ERR(base))

 *      return PTR_ERR(base);

 */

void __iomem *devm_ioremap_resource(struct device *dev, struct resource *res)

{

    resource_size_t size;

    void __iomem *dest_ptr;

​

    BUG_ON(!dev);

​

    if (!res || resource_type(res) != IORESOURCE_MEM) {

        dev_err(dev, "invalid resource\n");

        return IOMEM_ERR_PTR(-EINVAL);

    }

​

    size = resource_size(res);

​

        dev_err(dev, "can't request region for resource %pR\n", res);

        return IOMEM_ERR_PTR(-EBUSY);

    }

​

    dest_ptr = devm_ioremap(dev, res->start, size);

    if (!dest_ptr) {

        dev_err(dev, "ioremap failed for resource %pR\n", res);

        devm_release_mem_region(dev, res->start, size);

        dest_ptr = IOMEM_ERR_PTR(-ENOMEM);

    }