indirect_pci.c

内核linux2.4.20,可跟rtlinux3.2打补丁 组成实时linux系统,编译内核

/*
 * BK Id: SCCS/s.indirect_pci.c 1.10 09/08/01 15:47:42 paulus
 */
/*
 * Support for indirect PCI bridges.
 *
 * Copyright (C) 1998 Gabriel Paubert.
 *
 * 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/kernel.h>
#include <linux/pci.h>
#include <linux/delay.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/bootmem.h>

#include <asm/io.h>
#include <asm/prom.h>
#include <asm/pci-bridge.h>
#include <asm/machdep.h>

#include "pci.h"

#define cfg_read(val, addr, type, op)	*val = op((type)(addr))
#define cfg_write(val, addr, type, op)	op((type *)(addr), (val))

#define INDIRECT_PCI_OP(rw, size, type, op, mask)			 \
static int								 \
indirect_##rw##_config_##size(struct pci_dev *dev, int offset, type val) \
{									 \
	struct pci_controller *hose = dev->sysdata;			 \
									 \
	out_be32(hose->cfg_addr, 					 \
		 ((offset & 0xfc) << 24) | (dev->devfn << 16)		 \
		 | (dev->bus->number << 8) | 0x80);			 \
	cfg_##rw(val, hose->cfg_data + (offset & mask), type, op);	 \
	return PCIBIOS_SUCCESSFUL;    					 \
}

INDIRECT_PCI_OP(read, byte, u8 *, in_8, 3)
INDIRECT_PCI_OP(read, word, u16 *, in_le16, 2)
INDIRECT_PCI_OP(read, dword, u32 *, in_le32, 0)
INDIRECT_PCI_OP(write, byte, u8, out_8, 3)
INDIRECT_PCI_OP(write, word, u16, out_le16, 2)
INDIRECT_PCI_OP(write, dword, u32, out_le32, 0)

static struct pci_ops indirect_pci_ops =
{
	indirect_read_config_byte,
	indirect_read_config_word,
	indirect_read_config_dword,
	indirect_write_config_byte,
	indirect_write_config_word,
	indirect_write_config_dword
};

void __init
setup_indirect_pci(struct pci_controller* hose, u32 cfg_addr, u32 cfg_data)
{
	hose->ops = &indirect_pci_ops;
	hose->cfg_addr = (unsigned int *) ioremap(cfg_addr, 4);
	hose->cfg_data = (unsigned char *) ioremap(cfg_data, 4);
}