arch/powerpc/include/asm/tce.h

   1 /*
   2  * Copyright (C) 2001 Mike Corrigan & Dave Engebretsen, IBM Corporation
   3  * Rewrite, cleanup:
   4  * Copyright (C) 2004 Olof Johansson <olof@lixom.net>, IBM Corporation
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  19  */
  20
  21 #ifndef _ASM_POWERPC_TCE_H
  22 #define _ASM_POWERPC_TCE_H
  23 #ifdef __KERNEL__
  24
  25 #include <asm/iommu.h>
  26
  27 /*
  28  * Tces come in two formats, one for the virtual bus and a different
  29  * format for PCI.  PCI TCEs can have hardware or software maintianed
  30  * coherency.
  31  */
  32 #define TCE_VB                  0
  33 #define TCE_PCI                 1
  34
  35 /* TCE page size is 4096 bytes (1 << 12) */
  36
  37 #define TCE_SHIFT       12
  38 #define TCE_PAGE_SIZE   (1 << TCE_SHIFT)
  39
  40 #define TCE_ENTRY_SIZE          8               /* each TCE is 64 bits */
  41
  42 #define TCE_RPN_MASK            0xfffffffffful  /* 40-bit RPN (4K pages) */
  43 #define TCE_RPN_SHIFT           12
  44 #define TCE_VALID               0x800           /* TCE valid */
  45 #define TCE_ALLIO               0x400           /* TCE valid for all lpars */
  46 #define TCE_PCI_WRITE           0x2             /* write from PCI allowed */
  47 #define TCE_PCI_READ            0x1             /* read from PCI allowed */
  48 #define TCE_VB_WRITE            0x1             /* write from VB allowed */
  49
  50 #endif /* __KERNEL__ */
  51 #endif /* _ASM_POWERPC_TCE_H */