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 #include <linux/spinlock.h>
  26
  27 typedef struct {
  28         unsigned int base;
  29 } dcr_host_t;
  30
  31 #define DCR_MAP_OK(host)        (1)
  32
  33 #define dcr_map(dev, dcr_n, dcr_c)      ((dcr_host_t){ .base = (dcr_n) })
  34 #define dcr_unmap(host, dcr_c)          do {} while (0)
  35 #define dcr_read(host, dcr_n)           mfdcr(dcr_n + host.base)
  36 #define dcr_write(host, dcr_n, value)   mtdcr(dcr_n + host.base, value)
  37
  38 /* Device Control Registers */
  39 void __mtdcr(int reg, unsigned int val);
  40 unsigned int __mfdcr(int reg);
  41 #define mfdcr(rn)                                               \
  42         ({unsigned int rval;                                    \
  43         if (__builtin_constant_p(rn))                           \
  44                 asm volatile("mfdcr %0," __stringify(rn)        \
  45                               : "=r" (rval));                   \
  46         else                                                    \
  47                 rval = __mfdcr(rn);                             \
  48         rval;})
  49
  50 #define mtdcr(rn, v)                                            \
  51 do {                                                            \
  52         if (__builtin_constant_p(rn))                           \
  53                 asm volatile("mtdcr " __stringify(rn) ",%0"     \
  54                               : : "r" (v));                     \
  55         else                                                    \
  56                 __mtdcr(rn, v);                                 \
  57 } while (0)
  58
  59 /* R/W of indirect DCRs make use of standard naming conventions for DCRs */
  60 extern spinlock_t dcr_ind_lock;
  61
  62 static inline unsigned __mfdcri(int base_addr, int base_data, int reg)
  63 {
  64         unsigned long flags;
  65         unsigned int val;
  66
  67         spin_lock_irqsave(&dcr_ind_lock, flags);
  68         __mtdcr(base_addr, reg);
  69         val = __mfdcr(base_data);
  70         spin_unlock_irqrestore(&dcr_ind_lock, flags);
  71         return val;
  72 }
  73
  74 static inline void __mtdcri(int base_addr, int base_data, int reg,
  75                             unsigned val)
  76 {
  77         unsigned long flags;
  78
  79         spin_lock_irqsave(&dcr_ind_lock, flags);
  80         __mtdcr(base_addr, reg);
  81         __mtdcr(base_data, val);
  82         spin_unlock_irqrestore(&dcr_ind_lock, flags);
  83 }
  84
  85 #define mfdcri(base, reg)       __mfdcri(DCRN_ ## base ## _CONFIG_ADDR, \
  86                                          DCRN_ ## base ## _CONFIG_DATA, \
  87                                          reg)
  88
  89 #define mtdcri(base, reg, data) __mtdcri(DCRN_ ## base ## _CONFIG_ADDR, \
  90                                          DCRN_ ## base ## _CONFIG_DATA, \
  91                                          reg, data)
  92
  93 #endif /* __ASSEMBLY__ */
  94 #endif /* __KERNEL__ */
  95 #endif /* _ASM_POWERPC_DCR_NATIVE_H */