include/asm-powerpc/dcr-native.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_NATIVE_H
  21 #define _ASM_POWERPC_DCR_NATIVE_H
  22 #ifdef __KERNEL__
  23 #ifndef __ASSEMBLY__
  24
  25 typedef struct {
  26         unsigned int base;
  27 } dcr_host_t;
  28
  29 #define DCR_MAP_OK(host)        (1)
  30
  31 #define dcr_map(dev, dcr_n, dcr_c)      ((dcr_host_t){ .base = (dcr_n) })
  32 #define dcr_unmap(host, dcr_n, dcr_c)   do {} while (0)
  33 #define dcr_read(host, dcr_n)           mfdcr(dcr_n + host.base)
  34 #define dcr_write(host, dcr_n, value)   mtdcr(dcr_n + host.base, value)
  35
  36 /* Device Control Registers */
  37 void __mtdcr(int reg, unsigned int val);
  38 unsigned int __mfdcr(int reg);
  39 #define mfdcr(rn)                                               \
  40         ({unsigned int rval;                                    \
  41         if (__builtin_constant_p(rn))                           \
  42                 asm volatile("mfdcr %0," __stringify(rn)        \
  43                               : "=r" (rval));                   \
  44         else                                                    \
  45                 rval = __mfdcr(rn);                             \
  46         rval;})
  47
  48 #define mtdcr(rn, v)                                            \
  49 do {                                                            \
  50         if (__builtin_constant_p(rn))                           \
  51                 asm volatile("mtdcr " __stringify(rn) ",%0"     \
  52                               : : "r" (v));                     \
  53         else                                                    \
  54                 __mtdcr(rn, v);                                 \
  55 } while (0)
  56
  57 /* R/W of indirect DCRs make use of standard naming conventions for DCRs */
  58 #define mfdcri(base, reg)                       \
  59 ({                                              \
  60         mtdcr(base ## _CFGADDR, base ## _ ## reg);      \
  61         mfdcr(base ## _CFGDATA);                        \
  62 })
  63
  64 #define mtdcri(base, reg, data)                 \
  65 do {                                            \
  66         mtdcr(base ## _CFGADDR, base ## _ ## reg);      \
  67         mtdcr(base ## _CFGDATA, data);          \
  68 } while (0)
  69
  70 #endif /* __ASSEMBLY__ */
  71 #endif /* __KERNEL__ */
  72 #endif /* _ASM_POWERPC_DCR_NATIVE_H */
  73
  74