LXR linux/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
  15static 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
  22static 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
  29static struct pci_controller  loongson_pci_controller = {
  30        .pci_ops        = &bonito64_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
  37static 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        BONITO_PCIMAP = BONITO_PCIMAP_PCIMAP_2 |
  48                BONITO_PCIMAP_WIN(2, BONITO_PCILO2_BASE) |
  49                BONITO_PCIMAP_WIN(1, BONITO_PCILO1_BASE) |
  50                BONITO_PCIMAP_WIN(0, 0);
  51
  52        /*
  53         * PCI-DMA to local mapping: [2G,2G+256M] -> [0M,256M]
  54         */
  55        BONITO_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
  72static int __init pcibios_init(void)
  73{
  74        setup_pcimap();
  75
  76        loongson_pci_controller.io_map_base = mips_io_port_base;
  77
  78        register_pci_controller(&loongson_pci_controller);
  79
  80        return 0;
  81}
  82
  83arch_initcall(pcibios_init);
  84