404 lines
12 KiB
C
Executable file
404 lines
12 KiB
C
Executable file
/*
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drivers/net/ethernet/dec/tulip/pnic2.c
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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 submit bugs to http://bugzilla.kernel.org/ .
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*/
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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 - failed
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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/delay.h>
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void pnic2_timer(struct timer_list *t)
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{
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struct tulip_private *tp = from_timer(tp, t, timer);
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struct net_device *dev = tp->dev;
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void __iomem *ioaddr = tp->base_addr;
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int next_tick = 60*HZ;
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if (tulip_debug > 3)
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dev_info(&dev->dev, "PNIC2 negotiation status %08x\n",
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ioread32(ioaddr + CSR12));
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if (next_tick) {
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mod_timer(&tp->timer, RUN_AT(next_tick));
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}
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}
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void pnic2_start_nway(struct net_device *dev)
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{
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struct tulip_private *tp = netdev_priv(dev);
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void __iomem *ioaddr = tp->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 = (ioread32(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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netdev_dbg(dev, "Restarting PNIC2 autonegotiation, csr14=%08x\n",
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csr14);
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/* tell pnic2_lnk_change we are doing an nway negotiation */
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dev->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 = ioread32(ioaddr + CSR6);
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if (tulip_debug > 1)
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netdev_dbg(dev, "On Entry to Nway, csr6=%08x\n", 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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iowrite32(csr14, ioaddr + CSR14);
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iowrite32(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 = (ioread32(ioaddr + CSR12) & 0xffff8fff);
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csr12 |= 0x1000;
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iowrite32(csr12, ioaddr + CSR12);
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}
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void pnic2_lnk_change(struct net_device *dev, int csr5)
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{
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struct tulip_private *tp = netdev_priv(dev);
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void __iomem *ioaddr = tp->base_addr;
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int csr14;
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/* read the staus register to find out what is up */
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int csr12 = ioread32(ioaddr + CSR12);
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if (tulip_debug > 1)
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dev_info(&dev->dev,
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"PNIC2 link status interrupt %08x, CSR5 %x, %08x\n",
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csr12, csr5, ioread32(ioaddr + CSR14));
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/* If NWay finished and we have a negotiated partner capability.
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* check bits 14:12 for bit pattern 101 - all is good
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*/
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if (tp->nway && !tp->nwayset) {
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/* we did an auto negotiation */
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if ((csr12 & 0x7000) == 0x5000) {
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/* negotiation ended successfully */
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/* get the link partners reply and mask out all but
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* bits 24-21 which show the partners capabilities
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* and match those to what we advertised
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*
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* then begin to interpret the results of the negotiation.
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* Always go in this order : (we are ignoring T4 for now)
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* 100baseTx-FD, 100baseTx-HD, 10baseT-FD, 10baseT-HD
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*/
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int negotiated = ((csr12 >> 16) & 0x01E0) & tp->sym_advertise;
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tp->lpar = (csr12 >> 16);
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tp->nwayset = 1;
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if (negotiated & 0x0100) dev->if_port = 5;
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else if (negotiated & 0x0080) dev->if_port = 3;
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else if (negotiated & 0x0040) dev->if_port = 4;
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else if (negotiated & 0x0020) dev->if_port = 0;
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else {
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if (tulip_debug > 1)
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dev_info(&dev->dev,
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"funny autonegotiate result csr12 %08x advertising %04x\n",
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csr12, tp->sym_advertise);
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tp->nwayset = 0;
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/* so check if 100baseTx link state is okay */
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if ((csr12 & 2) == 0 && (tp->sym_advertise & 0x0180))
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dev->if_port = 3;
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}
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/* now record the duplex that was negotiated */
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tp->full_duplex = 0;
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if ((dev->if_port == 4) || (dev->if_port == 5))
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tp->full_duplex = 1;
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if (tulip_debug > 1) {
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if (tp->nwayset)
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dev_info(&dev->dev,
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"Switching to %s based on link negotiation %04x & %04x = %04x\n",
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medianame[dev->if_port],
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tp->sym_advertise, tp->lpar,
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negotiated);
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}
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/* remember to turn off bit 7 - autonegotiate
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* enable so we can properly end nway mode and
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* set duplex (ie. use csr6<9> again)
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*/
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csr14 = (ioread32(ioaddr + CSR14) & 0xffffff7f);
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iowrite32(csr14,ioaddr + CSR14);
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/* now set the data port and operating mode
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* (see the Data Port Selection comments at
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* the top of the file
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*/
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/* get current csr6 and mask off bits not to touch */
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/* see comment at top of file */
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tp->csr6 = (ioread32(ioaddr + CSR6) & 0xfe3bd1fd);
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/* so if using if_port 3 or 5 then select the 100baseT
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* port else select the 10baseT port.
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* See the Data Port Selection table at the top
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* of the file which was taken from the PNIC_II.PDF
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* datasheet
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*/
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if (dev->if_port & 1) tp->csr6 |= 0x01840000;
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else tp->csr6 |= 0x00400000;
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/* now set the full duplex bit appropriately */
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if (tp->full_duplex) tp->csr6 |= 0x00000200;
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iowrite32(1, ioaddr + CSR13);
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if (tulip_debug > 2)
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netdev_dbg(dev, "Setting CSR6 %08x/%x CSR12 %08x\n",
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tp->csr6,
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ioread32(ioaddr + CSR6),
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ioread32(ioaddr + CSR12));
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/* now the following actually writes out the
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* new csr6 values
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*/
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tulip_start_rxtx(tp);
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return;
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} else {
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dev_info(&dev->dev,
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"Autonegotiation failed, using %s, link beat status %04x\n",
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medianame[dev->if_port], csr12);
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/* remember to turn off bit 7 - autonegotiate
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* enable so we don't forget
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*/
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csr14 = (ioread32(ioaddr + CSR14) & 0xffffff7f);
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iowrite32(csr14,ioaddr + CSR14);
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/* what should we do when autonegotiate fails?
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* should we try again or default to baseline
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* case. I just don't know.
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*
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* for now default to some baseline case
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*/
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dev->if_port = 0;
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tp->nway = 0;
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tp->nwayset = 1;
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/* set to 10baseTx-HD - see Data Port Selection
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* comment given at the top of the file
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*/
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tp->csr6 = (ioread32(ioaddr + CSR6) & 0xfe3bd1fd);
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tp->csr6 |= 0x00400000;
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tulip_restart_rxtx(tp);
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return;
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}
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}
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if ((tp->nwayset && (csr5 & 0x08000000) &&
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(dev->if_port == 3 || dev->if_port == 5) &&
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(csr12 & 2) == 2) || (tp->nway && (csr5 & (TPLnkFail)))) {
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/* Link blew? Maybe restart NWay. */
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if (tulip_debug > 2)
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netdev_dbg(dev, "Ugh! Link blew?\n");
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del_timer_sync(&tp->timer);
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pnic2_start_nway(dev);
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tp->timer.expires = RUN_AT(3*HZ);
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add_timer(&tp->timer);
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return;
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}
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if (dev->if_port == 3 || dev->if_port == 5) {
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/* we are at 100mb and a potential link change occurred */
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if (tulip_debug > 1)
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dev_info(&dev->dev, "PNIC2 %s link beat %s\n",
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medianame[dev->if_port],
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(csr12 & 2) ? "failed" : "good");
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/* check 100 link beat */
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tp->nway = 0;
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tp->nwayset = 1;
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/* if failed then try doing an nway to get in sync */
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if ((csr12 & 2) && ! tp->medialock) {
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del_timer_sync(&tp->timer);
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pnic2_start_nway(dev);
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tp->timer.expires = RUN_AT(3*HZ);
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add_timer(&tp->timer);
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}
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return;
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}
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if (dev->if_port == 0 || dev->if_port == 4) {
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/* we are at 10mb and a potential link change occurred */
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if (tulip_debug > 1)
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dev_info(&dev->dev, "PNIC2 %s link beat %s\n",
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medianame[dev->if_port],
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(csr12 & 4) ? "failed" : "good");
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tp->nway = 0;
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tp->nwayset = 1;
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/* if failed, try doing an nway to get in sync */
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if ((csr12 & 4) && ! tp->medialock) {
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del_timer_sync(&tp->timer);
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pnic2_start_nway(dev);
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tp->timer.expires = RUN_AT(3*HZ);
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add_timer(&tp->timer);
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}
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return;
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}
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if (tulip_debug > 1)
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dev_info(&dev->dev, "PNIC2 Link Change Default?\n");
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/* if all else fails default to trying 10baseT-HD */
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dev->if_port = 0;
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/* make sure autonegotiate enable is off */
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csr14 = (ioread32(ioaddr + CSR14) & 0xffffff7f);
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iowrite32(csr14,ioaddr + CSR14);
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/* set to 10baseTx-HD - see Data Port Selection
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* comment given at the top of the file
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*/
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tp->csr6 = (ioread32(ioaddr + CSR6) & 0xfe3bd1fd);
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tp->csr6 |= 0x00400000;
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tulip_restart_rxtx(tp);
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}
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