/*
  	Copyright (C) 2004 - 2006 rt2x00 SourceForge Project
  	<http://rt2x00.serialmonkey.com>
  
  	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 program is distributed in the hope that 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.
   */
  
  /*
  	Module: eeprom_93cx6
  	Abstract: EEPROM reader datastructures for 93cx6 chipsets.

  	Supported chipsets: 93c46, 93c56 and 93c66.

   */
  
  /*
   * EEPROM operation defines.
   */
  #define PCI_EEPROM_WIDTH_93C46	6

  #define PCI_EEPROM_WIDTH_93C56	8

  #define PCI_EEPROM_WIDTH_93C66	8

  #define PCI_EEPROM_WIDTH_93C86	8

  #define PCI_EEPROM_WIDTH_OPCODE	3
  #define PCI_EEPROM_WRITE_OPCODE	0x05

  #define PCI_EEPROM_ERASE_OPCODE 0x07

  #define PCI_EEPROM_READ_OPCODE	0x06
  #define PCI_EEPROM_EWDS_OPCODE	0x10
  #define PCI_EEPROM_EWEN_OPCODE	0x13
  
  /**
   * struct eeprom_93cx6 - control structure for setting the commands
   * for reading the eeprom data.
   * @data: private pointer for the driver.
   * @register_read(struct eeprom_93cx6 *eeprom): handler to
   * read the eeprom register, this function should set all reg_* fields.
   * @register_write(struct eeprom_93cx6 *eeprom): handler to
   * write to the eeprom register by using all reg_* fields.
   * @width: eeprom width, should be one of the PCI_EEPROM_WIDTH_* defines

   * @drive_data: Set if we're driving the data line.

   * @reg_data_in: register field to indicate data input
   * @reg_data_out: register field to indicate data output
   * @reg_data_clock: register field to set the data clock
   * @reg_chip_select: register field to set the chip select
   *
   * This structure is used for the communication between the driver
   * and the eeprom_93cx6 handlers for reading the eeprom.
   */
  struct eeprom_93cx6 {
  	void *data;
  
  	void (*register_read)(struct eeprom_93cx6 *eeprom);
  	void (*register_write)(struct eeprom_93cx6 *eeprom);
  
  	int width;

  	char drive_data;

  	char reg_data_in;
  	char reg_data_out;
  	char reg_data_clock;
  	char reg_chip_select;
  };
  
  extern void eeprom_93cx6_read(struct eeprom_93cx6 *eeprom,
  	const u8 word, u16 *data);
  extern void eeprom_93cx6_multiread(struct eeprom_93cx6 *eeprom,
  	const u8 word, __le16 *data, const u16 words);

  
  extern void eeprom_93cx6_wren(struct eeprom_93cx6 *eeprom, bool enable);
  
  extern void eeprom_93cx6_write(struct eeprom_93cx6 *eeprom,
  			       u8 addr, u16 data);