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 #include <boot_param.h>
  15
  16 static struct resource loongson_pci_mem_resource = {
  17         .name   = "pci memory space",
  18         .start  = LOONGSON_PCI_MEM_START,
  19         .end    = LOONGSON_PCI_MEM_END,
  20         .flags  = IORESOURCE_MEM,
  21 };
  22
  23 static struct resource loongson_pci_io_resource = {
  24         .name   = "pci io space",
  25         .start  = LOONGSON_PCI_IO_START,
  26         .end    = IO_SPACE_LIMIT,
  27         .flags  = IORESOURCE_IO,
  28 };
  29
  30 static struct pci_controller  loongson_pci_controller = {
  31         .pci_ops        = &loongson_pci_ops,
  32         .io_resource    = &loongson_pci_io_resource,
  33         .mem_resource   = &loongson_pci_mem_resource,
  34         .mem_offset     = 0x00000000UL,
  35         .io_offset      = 0x00000000UL,
  36 };
  37
  38 static void __init setup_pcimap(void)
  39 {
  40         /*
  41          * local to PCI mapping for CPU accessing PCI space
  42          * CPU address space [256M,448M] is window for accessing pci space
  43          * we set pcimap_lo[0,1,2] to map it to pci space[0M,64M], [320M,448M]
  44          *
  45          * pcimap: PCI_MAP2  PCI_Mem_Lo2 PCI_Mem_Lo1 PCI_Mem_Lo0
  46          *           [<2G]   [384M,448M] [320M,384M] [0M,64M]
  47          */
  48         LOONGSON_PCIMAP = LOONGSON_PCIMAP_PCIMAP_2 |
  49                 LOONGSON_PCIMAP_WIN(2, LOONGSON_PCILO2_BASE) |
  50                 LOONGSON_PCIMAP_WIN(1, LOONGSON_PCILO1_BASE) |
  51                 LOONGSON_PCIMAP_WIN(0, 0);
  52
  53         /*
  54          * PCI-DMA to local mapping: [2G,2G+256M] -> [0M,256M]
  55          */
  56         LOONGSON_PCIBASE0 = 0x80000000ul;   /* base: 2G -> mmap: 0M */
  57         /* size: 256M, burst transmission, pre-fetch enable, 64bit */
  58         LOONGSON_PCI_HIT0_SEL_L = 0xc000000cul;
  59         LOONGSON_PCI_HIT0_SEL_H = 0xfffffffful;
  60         LOONGSON_PCI_HIT1_SEL_L = 0x00000006ul; /* set this BAR as invalid */
  61         LOONGSON_PCI_HIT1_SEL_H = 0x00000000ul;
  62         LOONGSON_PCI_HIT2_SEL_L = 0x00000006ul; /* set this BAR as invalid */
  63         LOONGSON_PCI_HIT2_SEL_H = 0x00000000ul;
  64
  65         /* avoid deadlock of PCI reading/writing lock operation */
  66         LOONGSON_PCI_ISR4C = 0xd2000001ul;
  67
  68         /* can not change gnt to break pci transfer when device's gnt not
  69         deassert for some broken device */
  70         LOONGSON_PXARB_CFG = 0x00fe0105ul;
  71
  72 #ifdef CONFIG_CPU_SUPPORTS_ADDRWINCFG
  73         /*
  74          * set cpu addr window2 to map CPU address space to PCI address space
  75          */
  76         LOONGSON_ADDRWIN_CPUTOPCI(ADDRWIN_WIN2, LOONGSON_CPU_MEM_SRC,
  77                 LOONGSON_PCI_MEM_DST, MMAP_CPUTOPCI_SIZE);
  78 #endif
  79 }
  80
  81 static int __init pcibios_init(void)
  82 {
  83         setup_pcimap();
  84
  85         loongson_pci_controller.io_map_base = mips_io_port_base;
  86 #ifdef CONFIG_LEFI_FIRMWARE_INTERFACE
  87         loongson_pci_mem_resource.start = loongson_sysconf.pci_mem_start_addr;
  88         loongson_pci_mem_resource.end = loongson_sysconf.pci_mem_end_addr;
  89 #endif
  90         register_pci_controller(&loongson_pci_controller);
  91
  92         return 0;
  93 }
  94
  95 arch_initcall(pcibios_init);