/*
   * (c) Copyright 2006 Benjamin Herrenschmidt, IBM Corp.
   *                    <benh@kernel.crashing.org>
   *
   *   This program is free software;  you can redistribute it and/or modify
   *   it under the terms of the GNU General Public License as published by
   *   the Free Software Foundation; either version 2 of the License, or
   *   (at your option) any later version.
   *
   *   This program is distributed in the hope that it will be useful,
   *   but WITHOUT ANY WARRANTY;  without even the implied warranty of
   *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
   *   the GNU General Public License for more details.
   *
   *   You should have received a copy of the GNU General Public License
   *   along with this program;  if not, write to the Free Software
   *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
   */
  
  #ifndef _ASM_POWERPC_DCR_MMIO_H
  #define _ASM_POWERPC_DCR_MMIO_H
  #ifdef __KERNEL__
  
  #include <asm/io.h>
  
  typedef struct { void __iomem *token; unsigned int stride; } dcr_host_t;
  
  #define DCR_MAP_OK(host)	((host).token != NULL)
  
  extern dcr_host_t dcr_map(struct device_node *dev, unsigned int dcr_n,
  			  unsigned int dcr_c);
  extern void dcr_unmap(dcr_host_t host, unsigned int dcr_n, unsigned int dcr_c);
  
  static inline u32 dcr_read(dcr_host_t host, unsigned int dcr_n)
  {
  	return in_be32(host.token + dcr_n * host.stride);
  }
  
  static inline void dcr_write(dcr_host_t host, unsigned int dcr_n, u32 value)
  {
  	out_be32(host.token + dcr_n * host.stride, value);
  }
  
  extern u64 of_translate_dcr_address(struct device_node *dev,
  				    unsigned int dcr_n,
  				    unsigned int *stride);
  
  #endif /* __KERNEL__ */
  #endif /* _ASM_POWERPC_DCR_MMIO_H */