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403 lines
12 KiB
403 lines
12 KiB
/* |
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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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