arch/powerpc/platforms/44x/misc_44x.S

   1 /*
   2  * This file contains miscellaneous low-level functions for PPC 44x.
   3  *    Copyright 2007 David Gibson <dwg@au1.ibm.com>, IBM Corporation.
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License
   7  * as published by the Free Software Foundation; either version
   8  * 2 of the License, or (at your option) any later version.
   9  *
  10  */
  11
  12 #include <asm/reg.h>
  13 #include <asm/ppc_asm.h>
  14
  15         .text
  16
  17 /*
  18  * Do an IO access in AS1
  19  */
  20 _GLOBAL(as1_readb)
  21         mfmsr   r7
  22         ori     r0,r7,MSR_DS
  23         sync
  24         mtmsr   r0
  25         sync
  26         isync
  27         lbz     r3,0(r3)
  28         sync
  29         mtmsr   r7
  30         sync
  31         isync
  32         blr
  33
  34 _GLOBAL(as1_writeb)
  35         mfmsr   r7
  36         ori     r0,r7,MSR_DS
  37         sync
  38         mtmsr   r0
  39         sync
  40         isync
  41         stb     r3,0(r4)
  42         sync
  43         mtmsr   r7
  44         sync
  45         isync
  46         blr
  47
  48 /*
  49  * void ppc44x_reset_system(char *cmd)
  50  *
  51  * At present, this routine just applies a system reset.
  52  */
  53 _GLOBAL(ppc44x_reset_system)
  54         mfspr   r13,SPRN_DBCR0
  55         oris    r13,r13,DBCR0_RST_SYSTEM@h
  56         mtspr   SPRN_DBCR0,r13
  57         b       .                       /* Just in case the reset doesn't work */