arch/mips/pci/ops-sni.c

/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * SNI specific PCI support for RM200/RM300.
 *
 * Copyright (C) 1997 - 2000, 2003 Ralf Baechle
 */
#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/types.h>
#include <asm/byteorder.h>
#include <asm/sni.h>

#define mkaddr(dev, where)                                                   \
do {                                                                         \
	if ((dev)->bus->number == 0)                                         \
		return -1;                                                   \
	*(volatile u32 *)PCIMT_CONFIG_ADDRESS =                              \
		 ((dev->bus->number    & 0xff) << 0x10) |                    \
	         ((dev->devfn & 0xff) << 0x08) |                             \
	         (where  & 0xfc);                                            \
} while(0)

/*
 * We can't address 8 and 16 bit words directly.  Instead we have to
 * read/write a 32bit word and mask/modify the data we actually want.
 */
static int pcimt_read_config_byte (struct pci_dev *dev,
                                   int where, unsigned char *val)
{
	u32 res;

	mkaddr(dev, where);
	res = *(volatile u32 *)PCIMT_CONFIG_DATA;
	res = (le32_to_cpu(res) >> ((where & 3) << 3)) & 0xff;
	*val = res;

	return PCIBIOS_SUCCESSFUL;
}

static int pcimt_read_config_word (struct pci_dev *dev,
                                   int where, unsigned short *val)
{
	u32 res;

	if (where & 1)
		return PCIBIOS_BAD_REGISTER_NUMBER;
	mkaddr(dev, where);
	res = *(volatile u32 *)PCIMT_CONFIG_DATA;
	res = (le32_to_cpu(res) >> ((where & 3) << 3)) & 0xffff;
	*val = res;

	return PCIBIOS_SUCCESSFUL;
}

static int pcimt_read_config_dword (struct pci_dev *dev,
                                    int where, unsigned int *val)
{
	u32 res;

		if (where & 3)
		return PCIBIOS_BAD_REGISTER_NUMBER;
	mkaddr(dev, where);
	res = *(volatile u32 *)PCIMT_CONFIG_DATA;
	res = le32_to_cpu(res);
	*val = res;

	return PCIBIOS_SUCCESSFUL;
}

static int pcimt_write_config_byte (struct pci_dev *dev,
                                    int where, unsigned char val)
{
	mkaddr(dev, where);
	*(volatile u8 *)(PCIMT_CONFIG_DATA + (where & 3)) = val;

	return PCIBIOS_SUCCESSFUL;
}

static int pcimt_write_config_word (struct pci_dev *dev,
                                    int where, unsigned short val)
{
	if (where & 1)
		return PCIBIOS_BAD_REGISTER_NUMBER;
	mkaddr(dev, where);
	*(volatile u16 *)(PCIMT_CONFIG_DATA + (where & 3)) = le16_to_cpu(val);

	return PCIBIOS_SUCCESSFUL;
}

static int pcimt_write_config_dword (struct pci_dev *dev,
                                     int where, unsigned int val)
{
	if (where & 3)
		return PCIBIOS_BAD_REGISTER_NUMBER;
	mkaddr(dev, where);
	*(volatile u32 *)PCIMT_CONFIG_DATA = le32_to_cpu(val);

	return PCIBIOS_SUCCESSFUL;
}

struct pci_ops sni_pci_ops = {
	pcimt_read_config_byte,
	pcimt_read_config_word,
	pcimt_read_config_dword,
	pcimt_write_config_byte,
	pcimt_write_config_word,
	pcimt_write_config_dword
};