/*
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 - failed
*
*
* 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);
}
