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pci.c

/*
 * pci.c
 *
 * Copyright (C) 2007 Lemote, Inc. & Institute of Computing Technology
 * Author: Fuxin Zhang, zhangfx@lemote.com
 *
 *  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.
 *
 *  THIS  SOFTWARE  IS PROVIDED   ``AS  IS'' AND   ANY  EXPRESS OR IMPLIED
 *  WARRANTIES,   INCLUDING, BUT NOT  LIMITED  TO, THE IMPLIED WARRANTIES OF
 *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
 *  NO  EVENT  SHALL   THE AUTHOR  BE    LIABLE FOR ANY   DIRECT, INDIRECT,
 *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 *  NOT LIMITED   TO, PROCUREMENT OF  SUBSTITUTE GOODS  OR SERVICES; LOSS OF
 *  USE, DATA,  OR PROFITS; OR  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 *  ANY THEORY OF LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT
 *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 *  You should have received a copy of the  GNU General Public License along
 *  with this program; if not, write  to the Free Software Foundation, Inc.,
 *  675 Mass Ave, Cambridge, MA 02139, USA.
 *
 */
#include <linux/types.h>
#include <linux/pci.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <asm/mips-boards/bonito64.h>
#include <asm/mach-lemote/pci.h>

extern struct pci_ops bonito64_pci_ops;

static struct resource loongson2e_pci_mem_resource = {
      .name   = "LOONGSON2E PCI MEM",
      .start  = LOONGSON2E_PCI_MEM_START,
      .end    = LOONGSON2E_PCI_MEM_END,
      .flags  = IORESOURCE_MEM,
};

static struct resource loongson2e_pci_io_resource = {
      .name   = "LOONGSON2E PCI IO MEM",
      .start  = LOONGSON2E_PCI_IO_START,
      .end    = IO_SPACE_LIMIT,
      .flags  = IORESOURCE_IO,
};

static struct pci_controller  loongson2e_pci_controller = {
      .pci_ops        = &bonito64_pci_ops,
      .io_resource    = &loongson2e_pci_io_resource,
      .mem_resource   = &loongson2e_pci_mem_resource,
      .mem_offset     = 0x00000000UL,
      .io_offset      = 0x00000000UL,
};

static void __init ict_pcimap(void)
{
      /*
       * local to PCI mapping: [256M,512M] -> [256M,512M]; differ from PMON
       *
       * CPU address space [256M,448M] is window for accessing pci space
       * we set pcimap_lo[0,1,2] to map it to pci space [256M,448M]
       * pcimap: bit18,pcimap_2; bit[17-12],lo2;bit[11-6],lo1;bit[5-0],lo0
       */
      /* 1,00 0110 ,0001 01,00 0000 */
      BONITO_PCIMAP = 0x46140;

      /* 1, 00 0010, 0000,01, 00 0000 */
      /* BONITO_PCIMAP = 0x42040; */

      /*
       * PCI to local mapping: [2G,2G+256M] -> [0,256M]
       */
      BONITO_PCIBASE0 = 0x80000000;
      BONITO_PCIBASE1 = 0x00800000;
      BONITO_PCIBASE2 = 0x90000000;

}

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

      loongson2e_pci_controller.io_map_base =
          (unsigned long) ioremap(LOONGSON2E_IO_PORT_BASE,
                            loongson2e_pci_io_resource.end -
                            loongson2e_pci_io_resource.start + 1);

      register_pci_controller(&loongson2e_pci_controller);

      return 0;
}

arch_initcall(pcibios_init);

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