text: /* SPDX-License-Identifier: GPL-2.0 */
  #ifndef __OF_IOMMU_H
  #define __OF_IOMMU_H
  
  #include <linux/device.h>
  #include <linux/iommu.h>
  #include <linux/of.h>
  
  #ifdef CONFIG_OF_IOMMU
  
  extern int of_get_dma_window(struct device_node *dn, const char *prefix,
  			     int index, unsigned long *busno, dma_addr_t *addr,
  			     size_t *size);
  
  extern const struct iommu_ops *of_iommu_configure(struct device *dev,
  					struct device_node *master_np);
  
  #else
  
  static inline int of_get_dma_window(struct device_node *dn, const char *prefix,
  			    int index, unsigned long *busno, dma_addr_t *addr,
  			    size_t *size)
  {
  	return -EINVAL;
  }
  
  static inline const struct iommu_ops *of_iommu_configure(struct device *dev,
  					 struct device_node *master_np)
  {
  	return NULL;
  }
  
  #endif	/* CONFIG_OF_IOMMU */
  
  extern struct of_device_id __iommu_of_table;
  
  typedef int (*of_iommu_init_fn)(struct device_node *);
  
  #define IOMMU_OF_DECLARE(name, compat, fn) \
  	_OF_DECLARE(iommu, name, compat, fn, of_iommu_init_fn)
  
  #endif /* __OF_IOMMU_H */
  