include/soc/arc/aux.h

   1 /*
   2  * Copyright (C) 2016-2017 Synopsys, Inc. (www.synopsys.com)
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2 as
   6  * published by the Free Software Foundation.
   7  *
   8  */
   9
  10 #ifndef __SOC_ARC_AUX_H__
  11 #define __SOC_ARC_AUX_H__
  12
  13 #ifdef CONFIG_ARC
  14
  15 #define read_aux_reg(r)         __builtin_arc_lr(r)
  16
  17 /* gcc builtin sr needs reg param to be long immediate */
  18 #define write_aux_reg(r, v)     __builtin_arc_sr((unsigned int)(v), r)
  19
  20 #else   /* !CONFIG_ARC */
  21
  22 static inline int read_aux_reg(u32 r)
  23 {
  24         return 0;
  25 }
  26
  27 /*
  28  * function helps elide unused variable warning
  29  * see: http://lists.infradead.org/pipermail/linux-snps-arc/2016-November/001748.html
  30  */
  31 static inline void write_aux_reg(u32 r, u32 v)
  32 {
  33         ;
  34 }
  35
  36 #endif
  37
  38 #define READ_BCR(reg, into)                             \
  39 {                                                       \
  40         unsigned int tmp;                               \
  41         tmp = read_aux_reg(reg);                        \
  42         if (sizeof(tmp) == sizeof(into)) {              \
  43                 into = *((typeof(into) *)&tmp);         \
  44         } else {                                        \
  45                 extern void bogus_undefined(void);      \
  46                 bogus_undefined();                      \
  47         }                                               \
  48 }
  49
  50 #define WRITE_AUX(reg, into)                            \
  51 {                                                       \
  52         unsigned int tmp;                               \
  53         if (sizeof(tmp) == sizeof(into)) {              \
  54                 tmp = (*(unsigned int *)&(into));       \
  55                 write_aux_reg(reg, tmp);                \
  56         } else  {                                       \
  57                 extern void bogus_undefined(void);      \
  58                 bogus_undefined();                      \
  59         }                                               \
  60 }
  61
  62
  63 #endif