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 * (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
 *   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

#ifdef __KERNEL__

#include <asm/io.h>

typedef struct {
      void __iomem *token;
      unsigned int stride;
      unsigned int base;
} dcr_host_mmio_t;

static inline bool dcr_map_ok_mmio(dcr_host_mmio_t host)
      return host.token != NULL;

extern dcr_host_mmio_t dcr_map_mmio(struct device_node *dev,
                            unsigned int dcr_n,
                            unsigned int dcr_c);
extern void dcr_unmap_mmio(dcr_host_mmio_t host, unsigned int dcr_c);

static inline u32 dcr_read_mmio(dcr_host_mmio_t host, unsigned int dcr_n)
      return in_be32(host.token + ((host.base + dcr_n) * host.stride));

static inline void dcr_write_mmio(dcr_host_mmio_t host,
                          unsigned int dcr_n,
                          u32 value)
      out_be32(host.token + ((host.base + 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 */

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