}
EXPORT_SYMBOL_GPL(acpi_dev_get_resources);
+static int is_memory(struct acpi_resource *ares, void *not_used)
+{
+ struct resource_win win;
+ struct resource *res = &win.res;
+
+ memset(&win, 0, sizeof(win));
+
+ return !(acpi_dev_resource_memory(ares, res)
+ || acpi_dev_resource_address_space(ares, &win)
+ || acpi_dev_resource_ext_address_space(ares, &win));
+}
+
+/**
+ * acpi_dev_get_dma_resources - Get current DMA resources of a device.
+ * @adev: ACPI device node to get the resources for.
+ * @list: Head of the resultant list of resources (must be empty).
+ *
+ * Evaluate the _DMA method for the given device node and process its
+ * output.
+ *
+ * The resultant struct resource objects are put on the list pointed to
+ * by @list, that must be empty initially, as members of struct
+ * resource_entry objects. Callers of this routine should use
+ * %acpi_dev_free_resource_list() to free that list.
+ *
+ * The number of resources in the output list is returned on success,
+ * an error code reflecting the error condition is returned otherwise.
+ */
+int acpi_dev_get_dma_resources(struct acpi_device *adev, struct list_head *list)
+{
+ return __acpi_dev_get_resources(adev, list, is_memory, NULL,
+ METHOD_NAME__DMA);
+}
+EXPORT_SYMBOL_GPL(acpi_dev_get_dma_resources);
+
/**
* acpi_dev_filter_resource_type - Filter ACPI resource according to resource
* types
}
/**
+ * acpi_dma_get_range() - Get device DMA parameters.
+ *
+ * @dev: device to configure
+ * @dma_addr: pointer device DMA address result
+ * @offset: pointer to the DMA offset result
+ * @size: pointer to DMA range size result
+ *
+ * Evaluate DMA regions and return respectively DMA region start, offset
+ * and size in dma_addr, offset and size on parsing success; it does not
+ * update the passed in values on failure.
+ *
+ * Return 0 on success, < 0 on failure.
+ */
+int acpi_dma_get_range(struct device *dev, u64 *dma_addr, u64 *offset,
+ u64 *size)
+{
+ struct acpi_device *adev;
+ LIST_HEAD(list);
+ struct resource_entry *rentry;
+ int ret;
+ struct device *dma_dev = dev;
+ u64 len, dma_start = U64_MAX, dma_end = 0, dma_offset = 0;
+
+ /*
+ * Walk the device tree chasing an ACPI companion with a _DMA
+ * object while we go. Stop if we find a device with an ACPI
+ * companion containing a _DMA method.
+ */
+ do {
+ adev = ACPI_COMPANION(dma_dev);
+ if (adev && acpi_has_method(adev->handle, METHOD_NAME__DMA))
+ break;
+
+ dma_dev = dma_dev->parent;
+ } while (dma_dev);
+
+ if (!dma_dev)
+ return -ENODEV;
+
+ if (!acpi_has_method(adev->handle, METHOD_NAME__CRS)) {
+ acpi_handle_warn(adev->handle, "_DMA is valid only if _CRS is present\n");
+ return -EINVAL;
+ }
+
+ ret = acpi_dev_get_dma_resources(adev, &list);
+ if (ret > 0) {
+ list_for_each_entry(rentry, &list, node) {
+ if (dma_offset && rentry->offset != dma_offset) {
+ ret = -EINVAL;
+ dev_warn(dma_dev, "Can't handle multiple windows with different offsets\n");
+ goto out;
+ }
+ dma_offset = rentry->offset;
+
+ /* Take lower and upper limits */
+ if (rentry->res->start < dma_start)
+ dma_start = rentry->res->start;
+ if (rentry->res->end > dma_end)
+ dma_end = rentry->res->end;
+ }
+
+ if (dma_start >= dma_end) {
+ ret = -EINVAL;
+ dev_dbg(dma_dev, "Invalid DMA regions configuration\n");
+ goto out;
+ }
+
+ *dma_addr = dma_start - dma_offset;
+ len = dma_end - dma_start;
+ *size = max(len, len + 1);
+ *offset = dma_offset;
+ }
+ out:
+ acpi_dev_free_resource_list(&list);
+
+ return ret >= 0 ? 0 : ret;
+}
+
+/**
* acpi_dma_configure - Set-up DMA configuration for the device.
* @dev: The pointer to the device
* @attr: device dma attributes
int acpi_dev_get_resources(struct acpi_device *adev, struct list_head *list,
int (*preproc)(struct acpi_resource *, void *),
void *preproc_data);
+int acpi_dev_get_dma_resources(struct acpi_device *adev,
+ struct list_head *list);
int acpi_dev_filter_resource_type(struct acpi_resource *ares,
unsigned long types);
return DEV_DMA_NOT_SUPPORTED;
}
+static inline int acpi_dma_get_range(struct device *dev, u64 *dma_addr,
+ u64 *offset, u64 *size)
+{
+ return -ENODEV;
+}
+
static inline int acpi_dma_configure(struct device *dev,
enum dev_dma_attr attr)
{