pnic2.c
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上传日期:2013-02-24
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- /*
- drivers/net/tulip/pnic2.c
- Maintained by Jeff Garzik <jgarzik@mandrakesoft.com>
- 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 refer to Documentation/DocBook/tulip.{pdf,ps,html}
- for more information on this driver, or visit the project
- Web page at http://sourceforge.net/projects/tulip/
- */
- /* 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- faild
- *
- *
- * 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/pci.h>
- #include <linux/delay.h>
- void pnic2_timer(unsigned long data)
- {
- struct net_device *dev = (struct net_device *)data;
- struct tulip_private *tp = (struct tulip_private *)dev->priv;
- long ioaddr = dev->base_addr;
- int next_tick = 60*HZ;
- if (tulip_debug > 3)
- printk(KERN_INFO"%s: PNIC2 negotiation status %8.8x.n",
- dev->name,inl(ioaddr + CSR12));
- if (next_tick) {
- mod_timer(&tp->timer, RUN_AT(next_tick));
- }
- }
- void pnic2_start_nway(struct net_device *dev)
- {
- struct tulip_private *tp = (struct tulip_private *)dev->priv;
- long ioaddr = dev->base_addr;
- int csr14;
- int csr12;
- /* set up what to advertise during the negotiation */
- /* load in csr14 and mask off bits not to touch
- * comment at top of file explains mask value
- */
- csr14 = (inl(ioaddr + CSR14) & 0xfff0ee39);
- /* bit 17 - advetise 100baseTx-FD */
- if (tp->sym_advertise & 0x0100) csr14 |= 0x00020000;
- /* bit 16 - advertise 100baseTx-HD */
- if (tp->sym_advertise & 0x0080) csr14 |= 0x00010000;
- /* bit 6 - advertise 10baseT-HD */
- if (tp->sym_advertise & 0x0020) csr14 |= 0x00000040;
- /* Now set bit 12 Link Test Enable, Bit 7 Autonegotiation Enable
- * and bit 0 Don't PowerDown 10baseT
- */
- csr14 |= 0x00001184;
- if (tulip_debug > 1)
- printk(KERN_DEBUG "%s: Restarting PNIC2 autonegotiation, "
- "csr14=%8.8x.n", dev->name, csr14);
- /* tell pnic2_lnk_change we are doing an nway negotiation */
- dev->if_port = 0;
- tp->nway = tp->mediasense = 1;
- tp->nwayset = tp->lpar = 0;
- /* now we have to set up csr6 for NWAY state */
- tp->csr6 = inl(ioaddr + CSR6);
- if (tulip_debug > 1)
- printk(KERN_DEBUG "%s: On Entry to Nway, "
- "csr6=%8.8x.n", dev->name, tp->csr6);
- /* mask off any bits not to touch
- * comment at top of file explains mask value
- */
- tp->csr6 = tp->csr6 & 0xfe3bd1fd;
- /* don't forget that bit 9 is also used for advertising */
- /* advertise 10baseT-FD for the negotiation (bit 9) */
- if (tp->sym_advertise & 0x0040) tp->csr6 |= 0x00000200;
- /* set bit 24 for nway negotiation mode ...
- * see Data Port Selection comment at top of file
- * and "Stop" - reset both Transmit (bit 13) and Receive (bit 1)
- */
- tp->csr6 |= 0x01000000;
- outl(csr14, ioaddr + CSR14);
- outl(tp->csr6, ioaddr + CSR6);
- udelay(100);
- /* all set up so now force the negotiation to begin */
- /* read in current values and mask off all but the
- * Autonegotiation bits 14:12. Writing a 001 to those bits
- * should start the autonegotiation
- */
- csr12 = (inl(ioaddr + CSR12) & 0xffff8fff);
- csr12 |= 0x1000;
- outl(csr12, ioaddr + CSR12);
- }
- void pnic2_lnk_change(struct net_device *dev, int csr5)
- {
- struct tulip_private *tp = (struct tulip_private *)dev->priv;
- long ioaddr = dev->base_addr;
- int csr14;
- /* read the staus register to find out what is up */
- int csr12 = inl(ioaddr + CSR12);
- if (tulip_debug > 1)
- printk(KERN_INFO"%s: PNIC2 link status interrupt %8.8x, "
- " CSR5 %x, %8.8x.n", dev->name, csr12,
- csr5, inl(ioaddr + CSR14));
- /* If NWay finished and we have a negotiated partner capability.
- * check bits 14:12 for bit pattern 101 - all is good
- */
- if (tp->nway && !tp->nwayset) {
- /* we did an auto negotiation */
- if ((csr12 & 0x7000) == 0x5000) {
- /* negotiation ended successfully */
- /* get the link partners reply and mask out all but
- * bits 24-21 which show the partners capabilites
- * and match those to what we advertised
- *
- * then begin to interpret the results of the negotiation.
- * Always go in this order : (we are ignoring T4 for now)
- * 100baseTx-FD, 100baseTx-HD, 10baseT-FD, 10baseT-HD
- */
- int negotiated = ((csr12 >> 16) & 0x01E0) & tp->sym_advertise;
- tp->lpar = (csr12 >> 16);
- tp->nwayset = 1;
- if (negotiated & 0x0100) dev->if_port = 5;
- else if (negotiated & 0x0080) dev->if_port = 3;
- else if (negotiated & 0x0040) dev->if_port = 4;
- else if (negotiated & 0x0020) dev->if_port = 0;
- else {
- if (tulip_debug > 1)
- printk(KERN_INFO "%s: funny autonegotiate result "
- "csr12 %8.8x advertising %4.4xn",
- dev->name, csr12, tp->sym_advertise);
- tp->nwayset = 0;
- /* so check if 100baseTx link state is okay */
- if ((csr12 & 2) == 0 && (tp->sym_advertise & 0x0180))
- dev->if_port = 3;
- }
- /* now record the duplex that was negotiated */
- tp->full_duplex = 0;
- if ((dev->if_port == 4) || (dev->if_port == 5))
- tp->full_duplex = 1;
- if (tulip_debug > 1) {
- if (tp->nwayset)
- printk(KERN_INFO "%s: Switching to %s based on link "
- "negotiation %4.4x & %4.4x = %4.4x.n",
- dev->name, medianame[dev->if_port],
- tp->sym_advertise, tp->lpar, negotiated);
- }
- /* remember to turn off bit 7 - autonegotiate
- * enable so we can properly end nway mode and
- * set duplex (ie. use csr6<9> again)
- */
- csr14 = (inl(ioaddr + CSR14) & 0xffffff7f);
- outl(csr14,ioaddr + CSR14);
- /* now set the data port and operating mode
- * (see the Data Port Selection comments at
- * the top of the file
- */
- /* get current csr6 and mask off bits not to touch */
- /* see comment at top of file */
- tp->csr6 = (inl(ioaddr + CSR6) & 0xfe3bd1fd);
- /* so if using if_port 3 or 5 then select the 100baseT
- * port else select the 10baseT port.
- * See the Data Port Selection table at the top
- * of the file which was taken from the PNIC_II.PDF
- * datasheet
- */
- if (dev->if_port & 1) tp->csr6 |= 0x01840000;
- else tp->csr6 |= 0x00400000;
- /* now set the full duplex bit appropriately */
- if (tp->full_duplex) tp->csr6 |= 0x00000200;
- outl(1, ioaddr + CSR13);
- if (tulip_debug > 2)
- printk(KERN_DEBUG "%s: Setting CSR6 %8.8x/%x CSR12 "
- "%8.8x.n", dev->name, tp->csr6,
- inl(ioaddr + CSR6), inl(ioaddr + CSR12));
- /* now the following actually writes out the
- * new csr6 values
- */
- tulip_start_rxtx(tp);
- return;
- } else {
- printk(KERN_INFO "%s: Autonegotiation failed, "
- "using %s, link beat status %4.4x.n",
- dev->name, medianame[dev->if_port], csr12);
- /* remember to turn off bit 7 - autonegotiate
- * enable so we don't forget
- */
- csr14 = (inl(ioaddr + CSR14) & 0xffffff7f);
- outl(csr14,ioaddr + CSR14);
- /* what should we do when autonegotiate fails?
- * should we try again or default to baseline
- * case. I just don't know.
- *
- * for now default to some baseline case
- */
- dev->if_port = 0;
- tp->nway = 0;
- tp->nwayset = 1;
- /* set to 10baseTx-HD - see Data Port Selection
- * comment given at the top of the file
- */
- tp->csr6 = (inl(ioaddr + CSR6) & 0xfe3bd1fd);
- tp->csr6 |= 0x00400000;
- tulip_restart_rxtx(tp);
- return;
- }
- }
- if ((tp->nwayset && (csr5 & 0x08000000)
- && (dev->if_port == 3 || dev->if_port == 5)
- && (csr12 & 2) == 2) || (tp->nway && (csr5 & (TPLnkFail)))) {
- /* Link blew? Maybe restart NWay. */
- if (tulip_debug > 2)
- printk(KERN_DEBUG "%s: Ugh! Link blew?n", dev->name);
- del_timer_sync(&tp->timer);
- pnic2_start_nway(dev);
- tp->timer.expires = RUN_AT(3*HZ);
- add_timer(&tp->timer);
- return;
- }
- if (dev->if_port == 3 || dev->if_port == 5) {
- /* we are at 100mb and a potential link change occurred */
- if (tulip_debug > 1)
- printk(KERN_INFO"%s: PNIC2 %s link beat %s.n",
- dev->name, medianame[dev->if_port],
- (csr12 & 2) ? "failed" : "good");
- /* check 100 link beat */
- tp->nway = 0;
- tp->nwayset = 1;
- /* if failed then try doing an nway to get in sync */
- if ((csr12 & 2) && ! tp->medialock) {
- del_timer_sync(&tp->timer);
- pnic2_start_nway(dev);
- tp->timer.expires = RUN_AT(3*HZ);
- add_timer(&tp->timer);
- }
- return;
- }
- if (dev->if_port == 0 || dev->if_port == 4) {
- /* we are at 10mb and a potential link change occurred */
- if (tulip_debug > 1)
- printk(KERN_INFO"%s: PNIC2 %s link beat %s.n",
- dev->name, medianame[dev->if_port],
- (csr12 & 4) ? "failed" : "good");
- tp->nway = 0;
- tp->nwayset = 1;
- /* if failed, try doing an nway to get in sync */
- if ((csr12 & 4) && ! tp->medialock) {
- del_timer_sync(&tp->timer);
- pnic2_start_nway(dev);
- tp->timer.expires = RUN_AT(3*HZ);
- add_timer(&tp->timer);
- }
- return;
- }
- if (tulip_debug > 1)
- printk(KERN_INFO"%s: PNIC2 Link Change Default?n",dev->name);
- /* if all else fails default to trying 10baseT-HD */
- dev->if_port = 0;
- /* make sure autonegotiate enable is off */
- csr14 = (inl(ioaddr + CSR14) & 0xffffff7f);
- outl(csr14,ioaddr + CSR14);
- /* set to 10baseTx-HD - see Data Port Selection
- * comment given at the top of the file
- */
- tp->csr6 = (inl(ioaddr + CSR6) & 0xfe3bd1fd);
- tp->csr6 |= 0x00400000;
- tulip_restart_rxtx(tp);
- }