include/asm-powerpc/dcr-mmio.h

   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
  26 typedef struct {
  27         void __iomem *token;
  28         unsigned int stride;
  29         unsigned int base;
  30 } dcr_host_t;
  31
  32 #define DCR_MAP_OK(host)        ((host).token != NULL)
  33
  34 extern dcr_host_t dcr_map(struct device_node *dev, unsigned int dcr_n,
  35                           unsigned int dcr_c);
  36 extern void dcr_unmap(dcr_host_t host, unsigned int dcr_c);
  37
  38 static inline u32 dcr_read(dcr_host_t host, unsigned int dcr_n)
  39 {
  40         return in_be32(host.token + ((host.base + dcr_n) * host.stride));
  41 }
  42
  43 static inline void dcr_write(dcr_host_t host, unsigned int dcr_n, u32 value)
  44 {
  45         out_be32(host.token + ((host.base + dcr_n) * host.stride), value);
  46 }
  47
  48 extern u64 of_translate_dcr_address(struct device_node *dev,
  49                                     unsigned int dcr_n,
  50                                     unsigned int *stride);
  51
  52 #endif /* __KERNEL__ */
  53 #endif /* _ASM_POWERPC_DCR_MMIO_H */
  54
  55