arch/nds32/include/asm/macro.h

   1 /*
   2  * include/asm-nds32/macro.h
   3  *
   4  * Copyright (C) 2009 Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
   5  * Copyright (C) 2011 Andes Technology Corporation
   6  * Macpaul Lin, Andes Technology Corporation <macpaul@andestech.com>
   7  *
   8  * See file CREDITS for list of people who contributed to this
   9  * project.
  10  *
  11  * This program is free software; you can redistribute it and/or
  12  * modify it under the terms of the GNU General Public License as
  13  * published by the Free Software Foundation; either version 2 of
  14  * the License, or (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  24  * MA 02111-1307 USA
  25  */
  26
  27 #ifndef __ASM_NDS_MACRO_H
  28 #define __ASM_NDS_MACRO_H
  29 #ifdef __ASSEMBLY__
  30
  31 /*
  32  * These macros provide a convenient way to write 8, 16 and 32 bit data
  33  * to an "immediate address (address used by periphal)" only.
  34  * Registers r4 and r5 are used, any data in these registers are
  35  * overwritten by the macros.
  36  * The macros are valid for any NDS32 architecture, they do not implement
  37  * any memory barriers so caution is recommended when using these when the
  38  * caches are enabled or on a multi-core system.
  39  */
  40
  41 .macro  write32, addr, data
  42         li      $r4, addr
  43         li      $r5, data
  44         swi     $r5, [$r4]
  45 .endm
  46
  47 .macro  write16, addr, data
  48         li      $r4, addr
  49         li      $r5, data
  50         shi     $r5, [$r4]
  51 .endm
  52
  53 .macro  write8, addr, data
  54         li      $r4, addr
  55         li      $r5, data
  56         sbi     $r5, [$r4]
  57 .endm
  58
  59 /*
  60  * This macro read a value from a register, then do OR operation
  61  * (set bit fields) to the value, and then store it back to the register.
  62  * Note: Instruction 'ori' supports immediate value up to 15 bits.
  63  */
  64 .macro  setbf32, addr, data
  65         li      $r4, addr
  66         lwi     $r5, [$r4]
  67         li      $r6, data
  68         or      $r5, $r5, $r6
  69         swi     $r5, [$r4]
  70 .endm
  71
  72 .macro  setbf15, addr, data
  73         li      $r4, addr
  74         lwi     $r5, [$r4]
  75         ori     $r5, $r5, data
  76         swi     $r5, [$r4]
  77 .endm
  78
  79 /*
  80  * This macro generates a loop that can be used for delays in the code.
  81  * Register r4 is used, any data in this register is overwritten by the
  82  * macro.
  83  * The macro is valid for any NDS32 architeture. The actual time spent in the
  84  * loop will vary from CPU to CPU though.
  85  */
  86
  87 .macro  wait_timer, time
  88         li      $r4, time
  89 1:
  90         nop
  91         addi    $r4, $r4, -1
  92         bnez    $r4, 1b
  93 .endm
  94
  95 #endif /* __ASSEMBLY__ */
  96 #endif /* __ASM_ARM_MACRO_H */