include/linux/of_iommu.h

   1 #ifndef __OF_IOMMU_H
   2 #define __OF_IOMMU_H
   3
   4 #include <linux/device.h>
   5 #include <linux/iommu.h>
   6 #include <linux/of.h>
   7
   8 #ifdef CONFIG_OF_IOMMU
   9
  10 extern int of_get_dma_window(struct device_node *dn, const char *prefix,
  11                              int index, unsigned long *busno, dma_addr_t *addr,
  12                              size_t *size);
  13
  14 extern const struct iommu_ops *of_iommu_configure(struct device *dev,
  15                                         struct device_node *master_np);
  16
  17 #else
  18
  19 static inline int of_get_dma_window(struct device_node *dn, const char *prefix,
  20                             int index, unsigned long *busno, dma_addr_t *addr,
  21                             size_t *size)
  22 {
  23         return -EINVAL;
  24 }
  25
  26 static inline const struct iommu_ops *of_iommu_configure(struct device *dev,
  27                                          struct device_node *master_np)
  28 {
  29         return NULL;
  30 }
  31
  32 #endif  /* CONFIG_OF_IOMMU */
  33
  34 static inline void of_iommu_set_ops(struct device_node *np,
  35                                     const struct iommu_ops *ops)
  36 {
  37         iommu_register_instance(&np->fwnode, ops);
  38 }
  39
  40 static inline const struct iommu_ops *of_iommu_get_ops(struct device_node *np)
  41 {
  42         return iommu_get_instance(&np->fwnode);
  43 }
  44
  45 extern struct of_device_id __iommu_of_table;
  46
  47 typedef int (*of_iommu_init_fn)(struct device_node *);
  48
  49 #define IOMMU_OF_DECLARE(name, compat, fn) \
  50         _OF_DECLARE(iommu, name, compat, fn, of_iommu_init_fn)
  51
  52 #endif /* __OF_IOMMU_H */