pci.c

linux内核源码

/*
 * pci.c
 *
 * Copyright (C) 2007 Lemote, Inc. & Institute of Computing Technology
 * Author: Fuxin Zhang, [e-mail]
 *
 *  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>

extern struct pci_ops bonito64_pci_ops;

static struct resource loongson2e_pci_mem_resource = {
	.name   = "LOONGSON2E PCI MEM",
	.start  = 0x14000000UL,
	.end    = 0x1fffffffUL,
	.flags  = IORESOURCE_MEM,
};

static struct resource loongson2e_pci_io_resource = {
	.name   = "LOONGSON2E PCI IO MEM",
	.start  = 0x00004000UL,
	.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)
{
	extern int pci_probe_only;
	pci_probe_only = 0;

	ict_pcimap();
	register_pci_controller(&loongson2e_pci_controller);

	return 0;
}

arch_initcall(pcibios_init);