arch/mips/include/asm/mach-loongson/pci.h

   1 /*
   2  * Copyright (c) 2008 Zhang Le <r0bertz@gentoo.org>
   3  * Copyright (c) 2009 Wu Zhangjin <wuzj@lemote.com>
   4  *
   5  * This program is free software; you can redistribute it
   6  * and/or modify it under the terms of the GNU General
   7  * Public License as published by the Free Software
   8  * Foundation; either version 2 of the License, or (at your
   9  * option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be
  12  * useful, but WITHOUT ANY WARRANTY; without even the implied
  13  * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
  14  * PURPOSE.  See the GNU General Public License for more
  15  * details.
  16  *
  17  * You should have received a copy of the GNU General Public
  18  * License along with this program; if not, write to the Free
  19  * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA
  20  * 02139, USA.
  21  */
  22
  23 #ifndef __ASM_MACH_LOONGSON_PCI_H_
  24 #define __ASM_MACH_LOONGSON_PCI_H_
  25
  26 extern struct pci_ops loongson_pci_ops;
  27
  28 /* this is an offset from mips_io_port_base */
  29 #define LOONGSON_PCI_IO_START   0x00004000UL
  30
  31 #ifdef CONFIG_CPU_SUPPORTS_ADDRWINCFG
  32
  33 /*
  34  * we use address window2 to map cpu address space to pci space
  35  * window2: cpu [1G, 2G] -> pci [1G, 2G]
  36  * why not use window 0 & 1? because they are used by cpu when booting.
  37  * window0: cpu [0, 256M] -> ddr [0, 256M]
  38  * window1: cpu [256M, 512M] -> pci [256M, 512M]
  39  */
  40
  41 /* the smallest LOONGSON_CPU_MEM_SRC can be 512M */
  42 #define LOONGSON_CPU_MEM_SRC    0x40000000ul            /* 1G */
  43 #define LOONGSON_PCI_MEM_DST    LOONGSON_CPU_MEM_SRC
  44
  45 #define LOONGSON_PCI_MEM_START  LOONGSON_PCI_MEM_DST
  46 #define LOONGSON_PCI_MEM_END    (0x80000000ul-1)        /* 2G */
  47
  48 #define MMAP_CPUTOPCI_SIZE      (LOONGSON_PCI_MEM_END - \
  49                                         LOONGSON_PCI_MEM_START + 1)
  50
  51 #else   /* loongson2f/32bit & loongson2e */
  52
  53 /* this pci memory space is mapped by pcimap in pci.c */
  54 #define LOONGSON_PCI_MEM_START  LOONGSON_PCILO1_BASE
  55 #define LOONGSON_PCI_MEM_END    (LOONGSON_PCILO1_BASE + 0x04000000 * 2)
  56 /* this is an offset from mips_io_port_base */
  57 #define LOONGSON_PCI_IO_START   0x00004000UL
  58
  59 #endif  /* !CONFIG_CPU_SUPPORTS_ADDRWINCFG */
  60
  61 #endif /* !__ASM_MACH_LOONGSON_PCI_H_ */