linux/arch/powerpc/include/asm/dcr-mmio.h
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   1/*
   2 * (c) Copyright 2006 Benjamin Herrenschmidt, IBM Corp.
   3 *                    <benh@kernel.crashing.org>
   4 *
   5 *   This program is free software;  you can redistribute it and/or modify
   6 *   it under the terms of the GNU General Public License as published by
   7 *   the Free Software Foundation; either version 2 of the License, or
   8 *   (at your option) any later version.
   9 *
  10 *   This program is distributed in the hope that it will be useful,
  11 *   but WITHOUT ANY WARRANTY;  without even the implied warranty of
  12 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  13 *   the GNU General Public License for more details.
  14 *
  15 *   You should have received a copy of the GNU General Public License
  16 *   along with this program;  if not, write to the Free Software
  17 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  18 */
  19
  20#ifndef _ASM_POWERPC_DCR_MMIO_H
  21#define _ASM_POWERPC_DCR_MMIO_H
  22#ifdef __KERNEL__
  23
  24#include <asm/io.h>
  25
  26typedef struct {
  27        void __iomem *token;
  28        unsigned int stride;
  29        unsigned int base;
  30} dcr_host_mmio_t;
  31
  32static inline bool dcr_map_ok_mmio(dcr_host_mmio_t host)
  33{
  34        return host.token != NULL;
  35}
  36
  37extern dcr_host_mmio_t dcr_map_mmio(struct device_node *dev,
  38                                    unsigned int dcr_n,
  39                                    unsigned int dcr_c);
  40extern void dcr_unmap_mmio(dcr_host_mmio_t host, unsigned int dcr_c);
  41
  42static inline u32 dcr_read_mmio(dcr_host_mmio_t host, unsigned int dcr_n)
  43{
  44        return in_be32(host.token + ((host.base + dcr_n) * host.stride));
  45}
  46
  47static inline void dcr_write_mmio(dcr_host_mmio_t host,
  48                                  unsigned int dcr_n,
  49                                  u32 value)
  50{
  51        out_be32(host.token + ((host.base + dcr_n) * host.stride), value);
  52}
  53
  54extern u64 of_translate_dcr_address(struct device_node *dev,
  55                                    unsigned int dcr_n,
  56                                    unsigned int *stride);
  57
  58#endif /* __KERNEL__ */
  59#endif /* _ASM_POWERPC_DCR_MMIO_H */
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