/*
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drivers/net/tulip/pnic2.c
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Maintained by Jeff Garzik <jgarzik@mandrakesoft.com>
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Copyright 2000,2001 The Linux Kernel Team
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Written/copyright 1994-2001 by Donald Becker.
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Modified to hep support PNIC_II by Kevin B. Hendricks
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This software may be used and distributed according to the terms
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of the GNU General Public License, incorporated herein by reference.
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Please refer to Documentation/DocBook/tulip.{pdf,ps,html}
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for more information on this driver, or visit the project
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Web page at http://sourceforge.net/projects/tulip/
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*/
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/* Ported to RTnet by Wittawat Yamwong <wittawat@web.de> */
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/* Understanding the PNIC_II - everything is this file is based
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* on the PNIC_II_PDF datasheet which is sorely lacking in detail
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*
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* As I understand things, here are the registers and bits that
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* explain the masks and constants used in this file that are
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* either different from the 21142/3 or important for basic operation.
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*
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*
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* CSR 6 (mask = 0xfe3bd1fd of bits not to change)
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* -----
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* Bit 24 - SCR
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* Bit 23 - PCS
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* Bit 22 - TTM (Trasmit Threshold Mode)
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* Bit 18 - Port Select
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* Bit 13 - Start - 1, Stop - 0 Transmissions
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* Bit 11:10 - Loop Back Operation Mode
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* Bit 9 - Full Duplex mode (Advertise 10BaseT-FD is CSR14<7> is set)
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* Bit 1 - Start - 1, Stop - 0 Receive
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*
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*
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* CSR 14 (mask = 0xfff0ee39 of bits not to change)
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* ------
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* Bit 19 - PAUSE-Pause
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* Bit 18 - Advertise T4
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* Bit 17 - Advertise 100baseTx-FD
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* Bit 16 - Advertise 100baseTx-HD
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* Bit 12 - LTE - Link Test Enable
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* Bit 7 - ANE - Auto Negotiate Enable
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* Bit 6 - HDE - Advertise 10baseT-HD
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* Bit 2 - Reset to Power down - kept as 1 for normal operation
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* Bit 1 - Loop Back enable for 10baseT MCC
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*
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*
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* CSR 12
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* ------
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* Bit 25 - Partner can do T4
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* Bit 24 - Partner can do 100baseTx-FD
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* Bit 23 - Partner can do 100baseTx-HD
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* Bit 22 - Partner can do 10baseT-FD
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* Bit 21 - Partner can do 10baseT-HD
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* Bit 15 - LPN is 1 if all above bits are valid other wise 0
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* Bit 14:12 - autonegotiation state (write 001 to start autonegotiate)
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* Bit 3 - Autopolarity state
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* Bit 2 - LS10B - link state of 10baseT 0 - good, 1 - failed
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* Bit 1 - LS100B - link state of 100baseT 0 - good, 1- faild
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*
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*
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* Data Port Selection Info
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*-------------------------
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*
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* CSR14<7> CSR6<18> CSR6<22> CSR6<23> CSR6<24> MODE/PORT
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* 1 0 0 (X) 0 (X) 1 NWAY
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* 0 0 1 0 (X) 0 10baseT
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* 0 1 0 1 1 (X) 100baseT
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*
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*
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*/
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#include "tulip.h"
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#include <linux/pci.h>
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#include <linux/delay.h>
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void pnic2_start_nway(/*RTnet*/struct rtnet_device *rtdev)
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{
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struct tulip_private *tp = (struct tulip_private *)rtdev->priv;
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long ioaddr = rtdev->base_addr;
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int csr14;
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int csr12;
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/* set up what to advertise during the negotiation */
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/* load in csr14 and mask off bits not to touch
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* comment at top of file explains mask value
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*/
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csr14 = (inl(ioaddr + CSR14) & 0xfff0ee39);
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/* bit 17 - advetise 100baseTx-FD */
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if (tp->sym_advertise & 0x0100) csr14 |= 0x00020000;
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/* bit 16 - advertise 100baseTx-HD */
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if (tp->sym_advertise & 0x0080) csr14 |= 0x00010000;
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/* bit 6 - advertise 10baseT-HD */
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if (tp->sym_advertise & 0x0020) csr14 |= 0x00000040;
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/* Now set bit 12 Link Test Enable, Bit 7 Autonegotiation Enable
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* and bit 0 Don't PowerDown 10baseT
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*/
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csr14 |= 0x00001184;
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if (tulip_debug > 1)
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printk(KERN_DEBUG "%s: Restarting PNIC2 autonegotiation, "
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"csr14=%8.8x.\n", rtdev->name, csr14);
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/* tell pnic2_lnk_change we are doing an nway negotiation */
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rtdev->if_port = 0;
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tp->nway = tp->mediasense = 1;
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tp->nwayset = tp->lpar = 0;
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/* now we have to set up csr6 for NWAY state */
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tp->csr6 = inl(ioaddr + CSR6);
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if (tulip_debug > 1)
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printk(KERN_DEBUG "%s: On Entry to Nway, "
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"csr6=%8.8x.\n", rtdev->name, tp->csr6);
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/* mask off any bits not to touch
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* comment at top of file explains mask value
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*/
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tp->csr6 = tp->csr6 & 0xfe3bd1fd;
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/* don't forget that bit 9 is also used for advertising */
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/* advertise 10baseT-FD for the negotiation (bit 9) */
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if (tp->sym_advertise & 0x0040) tp->csr6 |= 0x00000200;
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/* set bit 24 for nway negotiation mode ...
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* see Data Port Selection comment at top of file
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* and "Stop" - reset both Transmit (bit 13) and Receive (bit 1)
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*/
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tp->csr6 |= 0x01000000;
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outl(csr14, ioaddr + CSR14);
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outl(tp->csr6, ioaddr + CSR6);
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udelay(100);
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/* all set up so now force the negotiation to begin */
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/* read in current values and mask off all but the
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* Autonegotiation bits 14:12. Writing a 001 to those bits
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* should start the autonegotiation
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*/
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csr12 = (inl(ioaddr + CSR12) & 0xffff8fff);
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csr12 |= 0x1000;
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outl(csr12, ioaddr + CSR12);
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}
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