/* drivers/net/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 refer to Documentation/DocBook/tulip-user.{pdf,ps,html} for more information on this driver. 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- 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/delay.h> void pnic2_timer(unsigned long data) { struct net_device *dev = (struct net_device *)data; struct tulip_private *tp = netdev_priv(dev); void __iomem *ioaddr = tp->base_addr; int next_tick = 60*HZ; if (tulip_debug > 3) dev_info(&dev->dev, "PNIC2 negotiation status %08x\n", ioread32(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 = netdev_priv(dev); void __iomem *ioaddr = tp->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 = (ioread32(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=%08x\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 = ioread32(ioaddr + CSR6); if (tulip_debug > 1) printk(KERN_DEBUG "%s: On Entry to Nway, csr6=%08x\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; iowrite32(csr14, ioaddr + CSR14); iowrite32(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 = (ioread32(ioaddr + CSR12) & 0xffff8fff); csr12 |= 0x1000; iowrite32(csr12, ioaddr + CSR12); } void pnic2_lnk_change(struct net_device *dev, int csr5) { struct tulip_private *tp = netdev_priv(dev); void __iomem *ioaddr = tp->base_addr; int csr14; /* read the staus register to find out what is up */ int csr12 = ioread32(ioaddr + CSR12); if (tulip_debug > 1) dev_info(&dev->dev, "PNIC2 link status interrupt %08x, CSR5 %x, %08x\n", csr12, csr5, ioread32(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 capabilities * 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) dev_info(&dev->dev, "funny autonegotiate result csr12 %08x advertising %04x\n", 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) dev_info(&dev->dev, "Switching to %s based on link negotiation %04x & %04x = %04x\n", 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 = (ioread32(ioaddr + CSR14) & 0xffffff7f); iowrite32(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 = (ioread32(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; iowrite32(1, ioaddr + CSR13); if (tulip_debug > 2) printk(KERN_DEBUG "%s: Setting CSR6 %08x/%x CSR12 %08x\n", dev->name, tp->csr6, ioread32(ioaddr + CSR6), ioread32(ioaddr + CSR12)); /* now the following actually writes out the * new csr6 values */ tulip_start_rxtx(tp); return; } else { dev_info(&dev->dev, "Autonegotiation failed, using %s, link beat status %04x\n", medianame[dev->if_port], csr12); /* remember to turn off bit 7 - autonegotiate * enable so we don't forget */ csr14 = (ioread32(ioaddr + CSR14) & 0xffffff7f); iowrite32(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 = (ioread32(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) dev_info(&dev->dev, "PNIC2 %s link beat %s\n", 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) dev_info(&dev->dev, "PNIC2 %s link beat %s\n", 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) dev_info(&dev->dev, "PNIC2 Link Change Default?\n"); /* if all else fails default to trying 10baseT-HD */ dev->if_port = 0; /* make sure autonegotiate enable is off */ csr14 = (ioread32(ioaddr + CSR14) & 0xffffff7f); iowrite32(csr14,ioaddr + CSR14); /* set to 10baseTx-HD - see Data Port Selection * comment given at the top of the file */ tp->csr6 = (ioread32(ioaddr + CSR6) & 0xfe3bd1fd); tp->csr6 |= 0x00400000; tulip_restart_rxtx(tp); }