include/linux/of_iommu.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef __OF_IOMMU_H
   3 #define __OF_IOMMU_H
   4
   5 #include <linux/device.h>
   6 #include <linux/iommu.h>
   7 #include <linux/of.h>
   8
   9 #ifdef CONFIG_OF_IOMMU
  10
  11 extern int of_get_dma_window(struct device_node *dn, const char *prefix,
  12                              int index, unsigned long *busno, dma_addr_t *addr,
  13                              size_t *size);
  14
  15 extern const struct iommu_ops *of_iommu_configure(struct device *dev,
  16                                         struct device_node *master_np,
  17                                         const u32 *id);
  18
  19 #else
  20
  21 static inline int of_get_dma_window(struct device_node *dn, const char *prefix,
  22                             int index, unsigned long *busno, dma_addr_t *addr,
  23                             size_t *size)
  24 {
  25         return -EINVAL;
  26 }
  27
  28 static inline const struct iommu_ops *of_iommu_configure(struct device *dev,
  29                                          struct device_node *master_np,
  30                                          const u32 *id)
  31 {
  32         return NULL;
  33 }
  34
  35 #endif  /* CONFIG_OF_IOMMU */
  36
  37 #endif /* __OF_IOMMU_H */