/* * Carsten Langgaard, carstenl@mips.com * Copyright (C) 1999, 2000 MIPS Technologies, Inc.  All rights reserved. * *  This program is free software; you can distribute it and/or modify it *  under the terms of the GNU General Public License (Version 2) as *  published by the Free Software Foundation. * *  This program is distributed in the hope it will be useful, but WITHOUT *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License *  for more details. * *  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., *  59 Temple Place - Suite 330, Boston MA 02111-1307, USA. */#include <linux/types.h>#include <linux/pci.h>#include <linux/kernel.h>#include <linux/init.h>#include <asm/mips-boards/msc01_pci.h>#define PCI_ACCESS_READ  0#define PCI_ACCESS_WRITE 1/* *  PCI configuration cycle AD bus definition *//* Type 0 */#define PCI_CFG_TYPE0_REG_SHF           0#define PCI_CFG_TYPE0_FUNC_SHF          8/* Type 1 */#define PCI_CFG_TYPE1_REG_SHF           0#define PCI_CFG_TYPE1_FUNC_SHF          8#define PCI_CFG_TYPE1_DEV_SHF           11#define PCI_CFG_TYPE1_BUS_SHF           16static int msc_config_access(unsigned char access_type,	struct pci_dev *dev, unsigned char where, u32 *data){	unsigned char bus = dev->bus->number;	unsigned char dev_fn = dev->devfn;	unsigned char type;	u32 intr, dummy;	u64 pci_addr;	if ((bus == 0) && (PCI_SLOT(dev_fn) == 0))	        return -1;	/* Clear status register bits. */	MSC_WRITE(MSC01_PCI_INTSTAT,		  (MSC01_PCI_INTCFG_MA_BIT | MSC01_PCI_INTCFG_TA_BIT));	/* Setup address */	if (bus == 0)		type = 0;  /* Type 0 */	else		type = 1;  /* Type 1 */	MSC_WRITE(MSC01_PCI_CFGADDR,		  ((bus              << MSC01_PCI_CFGADDR_BNUM_SHF) |		   (PCI_SLOT(dev_fn) << MSC01_PCI_CFGADDR_DNUM_SHF) |		   (PCI_FUNC(dev_fn) << MSC01_PCI_CFGADDR_FNUM_SHF) |		   ((where /4 )      << MSC01_PCI_CFGADDR_RNUM_SHF) |		   (type)));	/* Perform access */	if (access_type == PCI_ACCESS_WRITE) {	        MSC_WRITE(MSC01_PCI_CFGDATA, *data);	} else {		MSC_READ(MSC01_PCI_CFGDATA, *data);	}	/* Detect Master/Target abort */	MSC_READ(MSC01_PCI_INTSTAT, intr);	if (intr & (MSC01_PCI_INTCFG_MA_BIT | MSC01_PCI_INTCFG_TA_BIT)) {	        /* Error occurred */	        /* Clear bits */		MSC_READ(MSC01_PCI_INTSTAT, intr);		MSC_WRITE(MSC01_PCI_INTSTAT,			  (MSC01_PCI_INTCFG_MA_BIT |			   MSC01_PCI_INTCFG_TA_BIT));		return -1;	}	return 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 msc_read_config_byte (struct pci_dev *dev, int where,	u8 *val){	u32 data = 0;	if (msc_config_access(PCI_ACCESS_READ, dev, where, &data))		return -1;	*val = (data >> ((where & 3) << 3)) & 0xff;	return PCIBIOS_SUCCESSFUL;}static int msc_read_config_word (struct pci_dev *dev, int where,	u16 *val){	u32 data = 0;	if (where & 1)		return PCIBIOS_BAD_REGISTER_NUMBER;	if (msc_config_access(PCI_ACCESS_READ, dev, where, &data))	       return -1;	*val = (data >> ((where & 3) << 3)) & 0xffff;	return PCIBIOS_SUCCESSFUL;}static int msc_read_config_dword (struct pci_dev *dev, int where,	u32 *val){	u32 data = 0;	if (where & 3)		return PCIBIOS_BAD_REGISTER_NUMBER;	if (msc_config_access(PCI_ACCESS_READ, dev, where, &data))		return -1;	*val = data;	return PCIBIOS_SUCCESSFUL;}static int msc_write_config_byte (struct pci_dev *dev, int where,	u8 val){	u32 data = 0;	if (msc_config_access(PCI_ACCESS_READ, dev, where, &data))		return -1;	data = (data & ~(0xff << ((where & 3) << 3))) |	       (val << ((where & 3) << 3));	if (msc_config_access(PCI_ACCESS_WRITE, dev, where, &data))		return -1;	return PCIBIOS_SUCCESSFUL;}static int msc_write_config_word (struct pci_dev *dev, int where,	u16 val){        u32 data = 0;	if (where & 1)		return PCIBIOS_BAD_REGISTER_NUMBER;        if (msc_config_access(PCI_ACCESS_READ, dev, where, &data))	       return -1;	data = (data & ~(0xffff << ((where & 3) << 3))) |	       (val << ((where & 3) << 3));	if (msc_config_access(PCI_ACCESS_WRITE, dev, where, &data))	       return -1;	return PCIBIOS_SUCCESSFUL;}static int msc_write_config_dword(struct pci_dev *dev, int where,	u32 val){	if (where & 3)		return PCIBIOS_BAD_REGISTER_NUMBER;	if (msc_config_access(PCI_ACCESS_WRITE, dev, where, &val))	       return -1;	return PCIBIOS_SUCCESSFUL;}struct pci_ops msc_pci_ops = {	msc_read_config_byte,        msc_read_config_word,	msc_read_config_dword,	msc_write_config_byte,	msc_write_config_word,	msc_write_config_dword};