include/asm-x86_64/calgary.h

   1 /*
   2  * Derived from include/asm-powerpc/iommu.h
   3  *
   4  * Copyright (C) 2006 Jon Mason <jdmason@us.ibm.com>, IBM Corporation
   5  * Copyright (C) 2006 Muli Ben-Yehuda <muli@il.ibm.com>, IBM Corporation
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  20  */
  21
  22 #ifndef _ASM_X86_64_CALGARY_H
  23 #define _ASM_X86_64_CALGARY_H
  24
  25 #include <linux/config.h>
  26 #include <linux/spinlock.h>
  27 #include <linux/device.h>
  28 #include <linux/dma-mapping.h>
  29 #include <asm/types.h>
  30
  31 struct iommu_table {
  32         unsigned long  it_base;      /* mapped address of tce table */
  33         unsigned long  it_hint;      /* Hint for next alloc */
  34         unsigned long *it_map;       /* A simple allocation bitmap for now */
  35         spinlock_t     it_lock;      /* Protects it_map */
  36         unsigned int   it_size;      /* Size of iommu table in entries */
  37         unsigned char  it_busno;     /* Bus number this table belongs to */
  38         void __iomem  *bbar;
  39         u64            tar_val;
  40         struct timer_list watchdog_timer;
  41 };
  42
  43 #define TCE_TABLE_SIZE_UNSPECIFIED      ~0
  44 #define TCE_TABLE_SIZE_64K              0
  45 #define TCE_TABLE_SIZE_128K             1
  46 #define TCE_TABLE_SIZE_256K             2
  47 #define TCE_TABLE_SIZE_512K             3
  48 #define TCE_TABLE_SIZE_1M               4
  49 #define TCE_TABLE_SIZE_2M               5
  50 #define TCE_TABLE_SIZE_4M               6
  51 #define TCE_TABLE_SIZE_8M               7
  52
  53 #ifdef CONFIG_CALGARY_IOMMU
  54 extern int calgary_iommu_init(void);
  55 extern void detect_calgary(void);
  56 #else
  57 static inline int calgary_iommu_init(void) { return 1; }
  58 static inline void detect_calgary(void) { return; }
  59 #endif
  60
  61 static inline unsigned int bus_to_phb(unsigned char busno)
  62 {
  63         return ((busno % 15 == 0) ? 0 : busno / 2 + 1);
  64 }
  65
  66 #endif /* _ASM_X86_64_CALGARY_H */