/*
   * Copyright (C) 1999, 2000, 2004  MIPS Technologies, Inc.
   *	All rights reserved.
   *	Authors: Carsten Langgaard <carstenl@mips.com>
   *		 Maciej W. Rozycki <macro@mips.com>
   *
   *  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.
   *
   * MIPS boards specific PCI support.
   */
  #include <linux/types.h>
  #include <linux/pci.h>
  #include <linux/kernel.h>
  
  #include <asm/mips-boards/bonito64.h>
  
  #define PCI_ACCESS_READ	 0
  #define PCI_ACCESS_WRITE 1
  
  #define CFG_SPACE_REG(offset) (void *)CKSEG1ADDR(_pcictrl_bonito_pcicfg + (offset))
  #define ID_SEL_BEGIN 10
  #define MAX_DEV_NUM (31 - ID_SEL_BEGIN)
  
  
  static int bonito64_pcibios_config_access(unsigned char access_type,
  				      struct pci_bus *bus,
  				      unsigned int devfn, int where,
  				      u32 * data)
  {
  	u32 busnum = bus->number;
  	u32 addr, type;
  	u32 dummy;
  	void *addrp;
  	int device = PCI_SLOT(devfn);
  	int function = PCI_FUNC(devfn);
  	int reg = where & ~3;
  
  	if (busnum == 0) {
  		/* Type 0 configuration for onboard PCI bus */
  		if (device > MAX_DEV_NUM)
  			return -1;
  
  		addr = (1 << (device + ID_SEL_BEGIN)) | (function << 8) | reg;
  		type = 0;
  	} else {
  		/* Type 1 configuration for offboard PCI bus */
  		addr = (busnum << 16) | (device << 11) | (function << 8) | reg;
  		type = 0x10000;
  	}
  
  	/* Clear aborts */
  	BONITO_PCICMD |= BONITO_PCICMD_MABORT_CLR | BONITO_PCICMD_MTABORT_CLR;
  
  	BONITO_PCIMAP_CFG = (addr >> 16) | type;
  
  	/* Flush Bonito register block */
  	dummy = BONITO_PCIMAP_CFG;
  	mmiowb();
  
  	addrp = CFG_SPACE_REG(addr & 0xffff);
  	if (access_type == PCI_ACCESS_WRITE) {
  		writel(cpu_to_le32(*data), addrp);
  		/* Wait till done */
  		while (BONITO_PCIMSTAT & 0xF);
  	} else {
  		*data = le32_to_cpu(readl(addrp));
  	}
  
  	/* Detect Master/Target abort */
  	if (BONITO_PCICMD & (BONITO_PCICMD_MABORT_CLR |
  			     BONITO_PCICMD_MTABORT_CLR)) {
  		/* Error occurred */
  
  		/* Clear bits */
  		BONITO_PCICMD |= (BONITO_PCICMD_MABORT_CLR |
  				  BONITO_PCICMD_MTABORT_CLR);
  
  		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 bonito64_pcibios_read(struct pci_bus *bus, unsigned int devfn,
  			     int where, int size, u32 * val)
  {
  	u32 data = 0;
  
  	if ((size == 2) && (where & 1))
  		return PCIBIOS_BAD_REGISTER_NUMBER;
  	else if ((size == 4) && (where & 3))
  		return PCIBIOS_BAD_REGISTER_NUMBER;
  
  	if (bonito64_pcibios_config_access(PCI_ACCESS_READ, bus, devfn, where,
  				       &data))
  		return -1;
  
  	if (size == 1)
  		*val = (data >> ((where & 3) << 3)) & 0xff;
  	else if (size == 2)
  		*val = (data >> ((where & 3) << 3)) & 0xffff;
  	else
  		*val = data;
  
  	return PCIBIOS_SUCCESSFUL;
  }
  
  static int bonito64_pcibios_write(struct pci_bus *bus, unsigned int devfn,
  			      int where, int size, u32 val)
  {
  	u32 data = 0;
  
  	if ((size == 2) && (where & 1))
  		return PCIBIOS_BAD_REGISTER_NUMBER;
  	else if ((size == 4) && (where & 3))
  		return PCIBIOS_BAD_REGISTER_NUMBER;
  
  	if (size == 4)
  		data = val;
  	else {
  		if (bonito64_pcibios_config_access(PCI_ACCESS_READ, bus, devfn,
  					       where, &data))
  			return -1;
  
  		if (size == 1)
  			data = (data & ~(0xff << ((where & 3) << 3))) |
  				(val << ((where & 3) << 3));
  		else if (size == 2)
  			data = (data & ~(0xffff << ((where & 3) << 3))) |
  				(val << ((where & 3) << 3));
  	}
  
  	if (bonito64_pcibios_config_access(PCI_ACCESS_WRITE, bus, devfn, where,
  				       &data))
  		return -1;
  
  	return PCIBIOS_SUCCESSFUL;
  }
  
  struct pci_ops bonito64_pci_ops = {
  	.read = bonito64_pcibios_read,
  	.write = bonito64_pcibios_write
  };