arch/mips/include/asm/mach-loongson2ef/pci.h

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 /*
   3  * Copyright (c) 2008 Zhang Le <r0bertz@gentoo.org>
   4  * Copyright (c) 2009 Wu Zhangjin <wuzhangjin@gmail.com>
   5  */
   6
   7 #ifndef __ASM_MACH_LOONGSON2EF_PCI_H_
   8 #define __ASM_MACH_LOONGSON2EF_PCI_H_
   9
  10 extern struct pci_ops loongson_pci_ops;
  11
  12 /* this is an offset from mips_io_port_base */
  13 #define LOONGSON_PCI_IO_START   0x00004000UL
  14
  15 #ifdef CONFIG_CPU_SUPPORTS_ADDRWINCFG
  16
  17 /*
  18  * we use address window2 to map cpu address space to pci space
  19  * window2: cpu [1G, 2G] -> pci [1G, 2G]
  20  * why not use window 0 & 1? because they are used by cpu when booting.
  21  * window0: cpu [0, 256M] -> ddr [0, 256M]
  22  * window1: cpu [256M, 512M] -> pci [256M, 512M]
  23  */
  24
  25 /* the smallest LOONGSON_CPU_MEM_SRC can be 512M */
  26 #define LOONGSON_CPU_MEM_SRC    0x40000000ul            /* 1G */
  27 #define LOONGSON_PCI_MEM_DST    LOONGSON_CPU_MEM_SRC
  28
  29 #define LOONGSON_PCI_MEM_START  LOONGSON_PCI_MEM_DST
  30 #define LOONGSON_PCI_MEM_END    (0x80000000ul-1)        /* 2G */
  31
  32 #define MMAP_CPUTOPCI_SIZE      (LOONGSON_PCI_MEM_END - \
  33                                         LOONGSON_PCI_MEM_START + 1)
  34
  35 #else   /* loongson2f/32bit & loongson2e */
  36
  37 /* this pci memory space is mapped by pcimap in pci.c */
  38 #define LOONGSON_PCI_MEM_START  LOONGSON_PCILO1_BASE
  39 #define LOONGSON_PCI_MEM_END    (LOONGSON_PCILO1_BASE + 0x04000000 * 2)
  40
  41 /* this is an offset from mips_io_port_base */
  42 #define LOONGSON_PCI_IO_START   0x00004000UL
  43
  44 #endif  /* !CONFIG_CPU_SUPPORTS_ADDRWINCFG */
  45
  46 #endif /* !__ASM_MACH_LOONGSON2EF_PCI_H_ */