release/src-rt-6.x.4708/linux/linux-2.6.36/arch/mips/loongson/common/pci.c

   1 /*
   2  * Copyright (C) 2007 Lemote, Inc. & Institute of Computing Technology
   3  * Author: Fuxin Zhang, zhangfx@lemote.com
   4  *
   5  *  This program is free software; you can redistribute  it and/or modify it
   6  *  under  the terms of  the GNU General  Public License as published by the
   7  *  Free Software Foundation;  either version 2 of the  License, or (at your
   8  *  option) any later version.
   9  */
  10 #include <linux/pci.h>
  11
  12 #include <pci.h>
  13 #include <loongson.h>
  14
  15 static struct resource loongson_pci_mem_resource = {
  16         .name   = "pci memory space",
  17         .start  = LOONGSON_PCI_MEM_START,
  18         .end    = LOONGSON_PCI_MEM_END,
  19         .flags  = IORESOURCE_MEM,
  20 };
  21
  22 static struct resource loongson_pci_io_resource = {
  23         .name   = "pci io space",
  24         .start  = LOONGSON_PCI_IO_START,
  25         .end    = IO_SPACE_LIMIT,
  26         .flags  = IORESOURCE_IO,
  27 };
  28
  29 static struct pci_controller  loongson_pci_controller = {
  30         .pci_ops        = &loongson_pci_ops,
  31         .io_resource    = &loongson_pci_io_resource,
  32         .mem_resource   = &loongson_pci_mem_resource,
  33         .mem_offset     = 0x00000000UL,
  34         .io_offset      = 0x00000000UL,
  35 };
  36
  37 static void __init setup_pcimap(void)
  38 {
  39         /*
  40          * local to PCI mapping for CPU accessing PCI space
  41          * CPU address space [256M,448M] is window for accessing pci space
  42          * we set pcimap_lo[0,1,2] to map it to pci space[0M,64M], [320M,448M]
  43          *
  44          * pcimap: PCI_MAP2  PCI_Mem_Lo2 PCI_Mem_Lo1 PCI_Mem_Lo0
  45          *           [<2G]   [384M,448M] [320M,384M] [0M,64M]
  46          */
  47         LOONGSON_PCIMAP = LOONGSON_PCIMAP_PCIMAP_2 |
  48                 LOONGSON_PCIMAP_WIN(2, LOONGSON_PCILO2_BASE) |
  49                 LOONGSON_PCIMAP_WIN(1, LOONGSON_PCILO1_BASE) |
  50                 LOONGSON_PCIMAP_WIN(0, 0);
  51
  52         /*
  53          * PCI-DMA to local mapping: [2G,2G+256M] -> [0M,256M]
  54          */
  55         LOONGSON_PCIBASE0 = 0x80000000ul;   /* base: 2G -> mmap: 0M */
  56         /* size: 256M, burst transmission, pre-fetch enable, 64bit */
  57         LOONGSON_PCI_HIT0_SEL_L = 0xc000000cul;
  58         LOONGSON_PCI_HIT0_SEL_H = 0xfffffffful;
  59         LOONGSON_PCI_HIT1_SEL_L = 0x00000006ul; /* set this BAR as invalid */
  60         LOONGSON_PCI_HIT1_SEL_H = 0x00000000ul;
  61         LOONGSON_PCI_HIT2_SEL_L = 0x00000006ul; /* set this BAR as invalid */
  62         LOONGSON_PCI_HIT2_SEL_H = 0x00000000ul;
  63
  64         /* avoid deadlock of PCI reading/writing lock operation */
  65         LOONGSON_PCI_ISR4C = 0xd2000001ul;
  66
  67         /* can not change gnt to break pci transfer when device's gnt not
  68         deassert for some broken device */
  69         LOONGSON_PXARB_CFG = 0x00fe0105ul;
  70
  71 #ifdef CONFIG_CPU_SUPPORTS_ADDRWINCFG
  72         /*
  73          * set cpu addr window2 to map CPU address space to PCI address space
  74          */
  75         LOONGSON_ADDRWIN_CPUTOPCI(ADDRWIN_WIN2, LOONGSON_CPU_MEM_SRC,
  76                 LOONGSON_PCI_MEM_DST, MMAP_CPUTOPCI_SIZE);
  77 #endif
  78 }
  79
  80 static int __init pcibios_init(void)
  81 {
  82         setup_pcimap();
  83
  84         loongson_pci_controller.io_map_base = mips_io_port_base;
  85
  86         register_pci_controller(&loongson_pci_controller);
  87
  88         return 0;
  89 }
  90
  91 arch_initcall(pcibios_init);