linux/drivers/net/ethernet/dec/tulip/eeprom.c

/*
	drivers/net/ethernet/dec/tulip/eeprom.c

	Copyright 2000,2001  The Linux Kernel Team
	Written/copyright 1994-2001 by Donald Becker.

	This software may be used and distributed according to the terms
	of the GNU General Public License, incorporated herein by reference.

	Please submit bug reports to http://bugzilla.kernel.org/.
*/

#include <linux/pci.h>
#include <linux/slab.h>
#include "tulip.h"
#include <asm/unaligned.h>



/* Serial EEPROM section. */
/* The main routine to parse the very complicated SROM structure.
   Search www.digital.com for "21X4 SROM" to get details.
   This code is very complex, and will require changes to support
   additional cards, so I'll be verbose about what is going on.
   */

/* Known cards that have old-style EEPROMs. */
static struct eeprom_fixup eeprom_fixups[] = …;


static const char *const block_name[] = …;


/**
 * tulip_build_fake_mediatable - Build a fake mediatable entry.
 * @tp: Ptr to the tulip private data.
 *
 * Some cards like the 3x5 HSC cards (J3514A) do not have a standard
 * srom and can not be handled under the fixup routine.  These cards
 * still need a valid mediatable entry for correct csr12 setup and
 * mii handling.
 *
 * Since this is currently a parisc-linux specific function, the
 * #ifdef __hppa__ should completely optimize this function away for
 * non-parisc hardware.
 */
static void tulip_build_fake_mediatable(struct tulip_private *tp)
{ … }

void tulip_parse_eeprom(struct net_device *dev)
{ … }
/* Reading a serial EEPROM is a "bit" grungy, but we work our way through:->.*/

/*  EEPROM_Ctrl bits. */
#define EE_SHIFT_CLK …
#define EE_CS …
#define EE_DATA_WRITE …
#define EE_WRITE_0 …
#define EE_WRITE_1 …
#define EE_DATA_READ …
#define EE_ENB …

/* Delay between EEPROM clock transitions.
   Even at 33Mhz current PCI implementations don't overrun the EEPROM clock.
   We add a bus turn-around to insure that this remains true. */
#define eeprom_delay() …

/* The EEPROM commands include the alway-set leading bit. */
#define EE_READ_CMD …

/* Note: this routine returns extra data bits for size detection. */
int tulip_read_eeprom(struct net_device *dev, int location, int addr_len)
{ … }