linux/drivers/net/ethernet/dec/tulip/pnic2.c

/*
	drivers/net/ethernet/dec/tulip/pnic2.c

	Copyright 2000,2001  The Linux Kernel Team
	Written/copyright 1994-2001 by Donald Becker.
        Modified to hep support PNIC_II by Kevin B. Hendricks

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

        Please submit bugs to http://bugzilla.kernel.org/ .
*/


/* Understanding the PNIC_II - everything is this file is based
 * on the PNIC_II_PDF datasheet which is sorely lacking in detail
 *
 * As I understand things, here are the registers and bits that
 * explain the masks and constants used in this file that are
 * either different from the 21142/3 or important for basic operation.
 *
 *
 * CSR 6  (mask = 0xfe3bd1fd of bits not to change)
 * -----
 * Bit 24    - SCR
 * Bit 23    - PCS
 * Bit 22    - TTM (Trasmit Threshold Mode)
 * Bit 18    - Port Select
 * Bit 13    - Start - 1, Stop - 0 Transmissions
 * Bit 11:10 - Loop Back Operation Mode
 * Bit 9     - Full Duplex mode (Advertise 10BaseT-FD is CSR14<7> is set)
 * Bit 1     - Start - 1, Stop - 0 Receive
 *
 *
 * CSR 14  (mask = 0xfff0ee39 of bits not to change)
 * ------
 * Bit 19    - PAUSE-Pause
 * Bit 18    - Advertise T4
 * Bit 17    - Advertise 100baseTx-FD
 * Bit 16    - Advertise 100baseTx-HD
 * Bit 12    - LTE - Link Test Enable
 * Bit 7     - ANE - Auto Negotiate Enable
 * Bit 6     - HDE - Advertise 10baseT-HD
 * Bit 2     - Reset to Power down - kept as 1 for normal operation
 * Bit 1     -  Loop Back enable for 10baseT MCC
 *
 *
 * CSR 12
 * ------
 * Bit 25    - Partner can do T4
 * Bit 24    - Partner can do 100baseTx-FD
 * Bit 23    - Partner can do 100baseTx-HD
 * Bit 22    - Partner can do 10baseT-FD
 * Bit 21    - Partner can do 10baseT-HD
 * Bit 15    - LPN is 1 if all above bits are valid other wise 0
 * Bit 14:12 - autonegotiation state (write 001 to start autonegotiate)
 * Bit 3     - Autopolarity state
 * Bit 2     - LS10B - link state of 10baseT 0 - good, 1 - failed
 * Bit 1     - LS100B - link state of 100baseT 0 - good, 1 - failed
 *
 *
 * Data Port Selection Info
 *-------------------------
 *
 * CSR14<7>   CSR6<18>    CSR6<22>    CSR6<23>    CSR6<24>   MODE/PORT
 *   1           0           0 (X)       0 (X)       1        NWAY
 *   0           0           1           0 (X)       0        10baseT
 *   0           1           0           1           1 (X)    100baseT
 *
 *
 */



#include "tulip.h"
#include <linux/delay.h>


void pnic2_timer(struct timer_list *t)
{ … }


void pnic2_start_nway(struct net_device *dev)
{ … }



void pnic2_lnk_change(struct net_device *dev, int csr5)
{ … }