pci.c

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/*
 * Copyright (C) 2007 Lemote, Inc. & Institute of Computing Technology
 * Author: Fuxin Zhang, [email protected]
 *
 *  This program is free software; you can redistribute  it and/or modify it
 *  under  the terms of  the GNU General  Public License as published by the
 *  Free Software Foundation;  either version 2 of the  License, or (at your
 *  option) any later version.
 */
#include <linux/pci.h>

#include <pci.h>
#include <loongson.h>

static struct resource loongson_pci_mem_resource = {
    .name   = "pci memory space",
    .start  = LOONGSON_PCI_MEM_START,
    .end    = LOONGSON_PCI_MEM_END,
    .flags  = IORESOURCE_MEM,
};

static struct resource loongson_pci_io_resource = {
    .name   = "pci io space",
    .start  = LOONGSON_PCI_IO_START,
    .end    = IO_SPACE_LIMIT,
    .flags  = IORESOURCE_IO,
};

static struct pci_controller  loongson_pci_controller = {
    .pci_ops        = &loongson_pci_ops,
    .io_resource    = &loongson_pci_io_resource,
    .mem_resource   = &loongson_pci_mem_resource,
    .mem_offset     = 0x00000000UL,
    .io_offset      = 0x00000000UL,
};

static void __init setup_pcimap(void)
{
    /*
     * local to PCI mapping for CPU accessing PCI space
     * CPU address space [256M,448M] is window for accessing pci space
     * we set pcimap_lo[0,1,2] to map it to pci space[0M,64M], [320M,448M]
     *
     * pcimap: PCI_MAP2  PCI_Mem_Lo2 PCI_Mem_Lo1 PCI_Mem_Lo0
     *       [<2G]   [384M,448M] [320M,384M] [0M,64M]
     */
    LOONGSON_PCIMAP = LOONGSON_PCIMAP_PCIMAP_2 |
        LOONGSON_PCIMAP_WIN(2, LOONGSON_PCILO2_BASE) |
        LOONGSON_PCIMAP_WIN(1, LOONGSON_PCILO1_BASE) |
        LOONGSON_PCIMAP_WIN(0, 0);

    /*
     * PCI-DMA to local mapping: [2G,2G+256M] -> [0M,256M]
     */
    LOONGSON_PCIBASE0 = 0x80000000ul;   /* base: 2G -> mmap: 0M */
    /* size: 256M, burst transmission, pre-fetch enable, 64bit */
    LOONGSON_PCI_HIT0_SEL_L = 0xc000000cul;
    LOONGSON_PCI_HIT0_SEL_H = 0xfffffffful;
    LOONGSON_PCI_HIT1_SEL_L = 0x00000006ul; /* set this BAR as invalid */
    LOONGSON_PCI_HIT1_SEL_H = 0x00000000ul;
    LOONGSON_PCI_HIT2_SEL_L = 0x00000006ul; /* set this BAR as invalid */
    LOONGSON_PCI_HIT2_SEL_H = 0x00000000ul;

    /* avoid deadlock of PCI reading/writing lock operation */
    LOONGSON_PCI_ISR4C = 0xd2000001ul;

    /* can not change gnt to break pci transfer when device's gnt not
    deassert for some broken device */
    LOONGSON_PXARB_CFG = 0x00fe0105ul;

#ifdef CONFIG_CPU_SUPPORTS_ADDRWINCFG
    /*
     * set cpu addr window2 to map CPU address space to PCI address space
     */
    LOONGSON_ADDRWIN_CPUTOPCI(ADDRWIN_WIN2, LOONGSON_CPU_MEM_SRC,
        LOONGSON_PCI_MEM_DST, MMAP_CPUTOPCI_SIZE);
#endif
}

static int __init pcibios_init(void)
{
    setup_pcimap();

    loongson_pci_controller.io_map_base = mips_io_port_base;

    register_pci_controller(&loongson_pci_controller);

    return 0;
}

arch_initcall(pcibios_init);