include/linux/of_pdt.h

   1 /*
   2  * Definitions for building a device tree by calling into the
   3  * Open Firmware PROM.
   4  *
   5  * Copyright (C) 2010  Andres Salomon <dilinger@queued.net>
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License
   9  * as published by the Free Software Foundation; either version
  10  * 2 of the License, or (at your option) any later version.
  11  */
  12
  13 #ifndef _LINUX_OF_PDT_H
  14 #define _LINUX_OF_PDT_H
  15
  16 /* overridable operations for calling into the PROM */
  17 struct of_pdt_ops {
  18         /*
  19          * buf should be 32 bytes; return 0 on success.
  20          * If prev is NULL, the first property will be returned.
  21          */
  22         int (*nextprop)(phandle node, char *prev, char *buf);
  23
  24         /* for both functions, return proplen on success; -1 on error */
  25         int (*getproplen)(phandle node, const char *prop);
  26         int (*getproperty)(phandle node, const char *prop, char *buf,
  27                         int bufsize);
  28
  29         /* phandles are 0 if no child or sibling exists */
  30         phandle (*getchild)(phandle parent);
  31         phandle (*getsibling)(phandle node);
  32
  33         /* return 0 on success; fill in 'len' with number of bytes in path */
  34         int (*pkg2path)(phandle node, char *buf, const int buflen, int *len);
  35 };
  36
  37 extern void *prom_early_alloc(unsigned long size);
  38
  39 /* for building the device tree */
  40 extern void of_pdt_build_devicetree(phandle root_node, struct of_pdt_ops *ops);
  41
  42 extern void (*of_pdt_build_more)(struct device_node *dp,
  43                 struct device_node ***nextp);
  44
  45 #endif /* _LINUX_OF_PDT_H */