[deliverable/linux.git] / drivers / net / tulip / pnic2.c

/*
	drivers/net/tulip/pnic2.c

	Maintained by Valerie Henson <val_henson@linux.intel.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-user.{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/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)
		printk(KERN_INFO"%s: PNIC2 negotiation status %8.8x.\n",
                    dev->name,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=%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 = ioread32(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;
	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)
		printk(KERN_INFO"%s: PNIC2 link status interrupt %8.8x, "
                       " CSR5 %x, %8.8x.\n", dev->name, 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)
		                   printk(KERN_INFO "%s: funny autonegotiate result "
                                        "csr12 %8.8x advertising %4.4x\n",
			                 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 = (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 %8.8x/%x CSR12 "
                                      "%8.8x.\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 {
	                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 = (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)
			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 = (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);
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	drivers/net/tulip/pnic2.c
	3
6b92801b	4	Maintained by Valerie Henson <val_henson@linux.intel.com>
1da177e4 LT	5	Copyright 2000,2001 The Linux Kernel Team
	6	Written/copyright 1994-2001 by Donald Becker.
	7	Modified to hep support PNIC_II by Kevin B. Hendricks
	8
	9	This software may be used and distributed according to the terms
	10	of the GNU General Public License, incorporated herein by reference.
	11
	12	Please refer to Documentation/DocBook/tulip-user.{pdf,ps,html}
	13	for more information on this driver, or visit the project
	14	Web page at http://sourceforge.net/projects/tulip/
	15
	16	*/
	17
	18
	19	/* Understanding the PNIC_II - everything is this file is based
	20	* on the PNIC_II_PDF datasheet which is sorely lacking in detail
	21	*
	22	* As I understand things, here are the registers and bits that
	23	* explain the masks and constants used in this file that are
	24	* either different from the 21142/3 or important for basic operation.
	25	*
	26	*
	27	* CSR 6 (mask = 0xfe3bd1fd of bits not to change)
	28	* -----
	29	* Bit 24 - SCR
	30	* Bit 23 - PCS
	31	* Bit 22 - TTM (Trasmit Threshold Mode)
	32	* Bit 18 - Port Select
	33	* Bit 13 - Start - 1, Stop - 0 Transmissions
	34	* Bit 11:10 - Loop Back Operation Mode
	35	* Bit 9 - Full Duplex mode (Advertise 10BaseT-FD is CSR14<7> is set)
	36	* Bit 1 - Start - 1, Stop - 0 Receive
	37	*
	38	*
	39	* CSR 14 (mask = 0xfff0ee39 of bits not to change)
	40	* ------
	41	* Bit 19 - PAUSE-Pause
	42	* Bit 18 - Advertise T4
	43	* Bit 17 - Advertise 100baseTx-FD
	44	* Bit 16 - Advertise 100baseTx-HD
	45	* Bit 12 - LTE - Link Test Enable
	46	* Bit 7 - ANE - Auto Negotiate Enable
	47	* Bit 6 - HDE - Advertise 10baseT-HD
	48	* Bit 2 - Reset to Power down - kept as 1 for normal operation
	49	* Bit 1 - Loop Back enable for 10baseT MCC
	50	*
	51	*
	52	* CSR 12
	53	* ------
	54	* Bit 25 - Partner can do T4
	55	* Bit 24 - Partner can do 100baseTx-FD
	56	* Bit 23 - Partner can do 100baseTx-HD
	57	* Bit 22 - Partner can do 10baseT-FD
	58	* Bit 21 - Partner can do 10baseT-HD
	59	* Bit 15 - LPN is 1 if all above bits are valid other wise 0
	60	* Bit 14:12 - autonegotiation state (write 001 to start autonegotiate)
	61	* Bit 3 - Autopolarity state
	62	* Bit 2 - LS10B - link state of 10baseT 0 - good, 1 - failed
	63	* Bit 1 - LS100B - link state of 100baseT 0 - good, 1- faild
	64	*
	65	*
	66	* Data Port Selection Info
	67	*-------------------------
	68	*
69	* CSR14<7> CSR6<18> CSR6<22> CSR6<23> CSR6<24> MODE/PORT
70	* 1 0 0 (X) 0 (X) 1 NWAY
71	* 0 0 1 0 (X) 0 10baseT
72	* 0 1 0 1 1 (X) 100baseT
73	*
74	*
75	*/
76
77
78
1da177e4 LT	79	#include "tulip.h"
	80	#include <linux/delay.h>
	81
	82
	83	void pnic2_timer(unsigned long data)
	84	{
	85	struct net_device dev = (struct net_device )data;
	86	struct tulip_private *tp = netdev_priv(dev);
	87	void __iomem *ioaddr = tp->base_addr;
	88	int next_tick = 60*HZ;
	89
	90	if (tulip_debug > 3)
	91	printk(KERN_INFO"%s: PNIC2 negotiation status %8.8x.\n",
	92	dev->name,ioread32(ioaddr + CSR12));
	93
	94	if (next_tick) {
	95	mod_timer(&tp->timer, RUN_AT(next_tick));
	96	}
	97	}
	98
	99
	100	void pnic2_start_nway(struct net_device *dev)
	101	{
	102	struct tulip_private *tp = netdev_priv(dev);
	103	void __iomem *ioaddr = tp->base_addr;
	104	int csr14;
	105	int csr12;
	106
	107	/* set up what to advertise during the negotiation */
	108
	109	/* load in csr14 and mask off bits not to touch
	110	* comment at top of file explains mask value
	111	*/
	112	csr14 = (ioread32(ioaddr + CSR14) & 0xfff0ee39);
	113
	114	/* bit 17 - advetise 100baseTx-FD */
	115	if (tp->sym_advertise & 0x0100) csr14 \|= 0x00020000;
	116
	117	/* bit 16 - advertise 100baseTx-HD */
	118	if (tp->sym_advertise & 0x0080) csr14 \|= 0x00010000;
	119
	120	/* bit 6 - advertise 10baseT-HD */
	121	if (tp->sym_advertise & 0x0020) csr14 \|= 0x00000040;
	122
	123	/* Now set bit 12 Link Test Enable, Bit 7 Autonegotiation Enable
	124	* and bit 0 Don't PowerDown 10baseT
	125	*/
	126	csr14 \|= 0x00001184;
	127
	128	if (tulip_debug > 1)
	129	printk(KERN_DEBUG "%s: Restarting PNIC2 autonegotiation, "
	130	"csr14=%8.8x.\n", dev->name, csr14);
	131
	132	/* tell pnic2_lnk_change we are doing an nway negotiation */
	133	dev->if_port = 0;
	134	tp->nway = tp->mediasense = 1;
	135	tp->nwayset = tp->lpar = 0;
	136
	137	/* now we have to set up csr6 for NWAY state */
	138
	139	tp->csr6 = ioread32(ioaddr + CSR6);
	140	if (tulip_debug > 1)
	141	printk(KERN_DEBUG "%s: On Entry to Nway, "
	142	"csr6=%8.8x.\n", dev->name, tp->csr6);
143
144	/* mask off any bits not to touch
145	* comment at top of file explains mask value
146	*/
147	tp->csr6 = tp->csr6 & 0xfe3bd1fd;
148
149	/* don't forget that bit 9 is also used for advertising */
150	/* advertise 10baseT-FD for the negotiation (bit 9) */
151	if (tp->sym_advertise & 0x0040) tp->csr6 \|= 0x00000200;
152
153	/* set bit 24 for nway negotiation mode ...
154	* see Data Port Selection comment at top of file
155	* and "Stop" - reset both Transmit (bit 13) and Receive (bit 1)
156	*/
157	tp->csr6 \|= 0x01000000;
158	iowrite32(csr14, ioaddr + CSR14);
159	iowrite32(tp->csr6, ioaddr + CSR6);
160	udelay(100);
161
162	/* all set up so now force the negotiation to begin */
163
164	/* read in current values and mask off all but the
165	* Autonegotiation bits 14:12. Writing a 001 to those bits
166	* should start the autonegotiation
167	*/
168	csr12 = (ioread32(ioaddr + CSR12) & 0xffff8fff);
169	csr12 \|= 0x1000;
170	iowrite32(csr12, ioaddr + CSR12);
171	}
172
173
174
175	void pnic2_lnk_change(struct net_device *dev, int csr5)
176	{
177	struct tulip_private *tp = netdev_priv(dev);
178	void __iomem *ioaddr = tp->base_addr;
179	int csr14;
180
181	/* read the staus register to find out what is up */
182	int csr12 = ioread32(ioaddr + CSR12);
183
184	if (tulip_debug > 1)
185	printk(KERN_INFO"%s: PNIC2 link status interrupt %8.8x, "
186	" CSR5 %x, %8.8x.\n", dev->name, csr12,
187	csr5, ioread32(ioaddr + CSR14));
188
189	/* If NWay finished and we have a negotiated partner capability.
190	* check bits 14:12 for bit pattern 101 - all is good
191	*/
192	if (tp->nway && !tp->nwayset) {
193
194	/* we did an auto negotiation */
195
196	if ((csr12 & 0x7000) == 0x5000) {
197
198	/* negotiation ended successfully */
199
200	/* get the link partners reply and mask out all but
7f927fcc	201	* bits 24-21 which show the partners capabilities
1da177e4 LT	202	* and match those to what we advertised
	203	*
	204	* then begin to interpret the results of the negotiation.
	205	* Always go in this order : (we are ignoring T4 for now)
	206	* 100baseTx-FD, 100baseTx-HD, 10baseT-FD, 10baseT-HD
	207	*/
	208
	209	int negotiated = ((csr12 >> 16) & 0x01E0) & tp->sym_advertise;
	210	tp->lpar = (csr12 >> 16);
	211	tp->nwayset = 1;
	212
	213	if (negotiated & 0x0100) dev->if_port = 5;
	214	else if (negotiated & 0x0080) dev->if_port = 3;
	215	else if (negotiated & 0x0040) dev->if_port = 4;
	216	else if (negotiated & 0x0020) dev->if_port = 0;
	217	else {
	218	if (tulip_debug > 1)
	219	printk(KERN_INFO "%s: funny autonegotiate result "
	220	"csr12 %8.8x advertising %4.4x\n",
	221	dev->name, csr12, tp->sym_advertise);
	222	tp->nwayset = 0;
	223	/* so check if 100baseTx link state is okay */
	224	if ((csr12 & 2) == 0 && (tp->sym_advertise & 0x0180))
	225	dev->if_port = 3;
	226	}
	227
	228	/* now record the duplex that was negotiated */
	229	tp->full_duplex = 0;
	230	if ((dev->if_port == 4) \|\| (dev->if_port == 5))
	231	tp->full_duplex = 1;
	232
	233	if (tulip_debug > 1) {
	234	if (tp->nwayset)
	235	printk(KERN_INFO "%s: Switching to %s based on link "
	236	"negotiation %4.4x & %4.4x = %4.4x.\n",
	237	dev->name, medianame[dev->if_port],
	238	tp->sym_advertise, tp->lpar, negotiated);
	239	}
	240
	241	/* remember to turn off bit 7 - autonegotiate
	242	* enable so we can properly end nway mode and
	243	* set duplex (ie. use csr6<9> again)
	244	*/
	245	csr14 = (ioread32(ioaddr + CSR14) & 0xffffff7f);
	246	iowrite32(csr14,ioaddr + CSR14);
	247
	248
	249	/* now set the data port and operating mode
	250	* (see the Data Port Selection comments at
	251	* the top of the file
	252	*/
	253
	254	/* get current csr6 and mask off bits not to touch */
	255	/* see comment at top of file */
	256
	257	tp->csr6 = (ioread32(ioaddr + CSR6) & 0xfe3bd1fd);
	258
	259	/* so if using if_port 3 or 5 then select the 100baseT
	260	* port else select the 10baseT port.
	261	* See the Data Port Selection table at the top
	262	* of the file which was taken from the PNIC_II.PDF
	263	* datasheet
	264	*/
	265	if (dev->if_port & 1) tp->csr6 \|= 0x01840000;
266	else tp->csr6 \|= 0x00400000;
267
268	/* now set the full duplex bit appropriately */
269	if (tp->full_duplex) tp->csr6 \|= 0x00000200;
270
271	iowrite32(1, ioaddr + CSR13);
272
273	if (tulip_debug > 2)
274	printk(KERN_DEBUG "%s: Setting CSR6 %8.8x/%x CSR12 "
275	"%8.8x.\n", dev->name, tp->csr6,
276	ioread32(ioaddr + CSR6), ioread32(ioaddr + CSR12));
277
278	/* now the following actually writes out the
279	* new csr6 values
280	*/
281	tulip_start_rxtx(tp);
282
283	return;
284
285	} else {
286	printk(KERN_INFO "%s: Autonegotiation failed, "
287	"using %s, link beat status %4.4x.\n",
288	dev->name, medianame[dev->if_port], csr12);
289
290	/* remember to turn off bit 7 - autonegotiate
291	* enable so we don't forget
292	*/
293	csr14 = (ioread32(ioaddr + CSR14) & 0xffffff7f);
294	iowrite32(csr14,ioaddr + CSR14);
295
296	/* what should we do when autonegotiate fails?
297	* should we try again or default to baseline
298	* case. I just don't know.
299	*
300	* for now default to some baseline case
301	*/
302
303	dev->if_port = 0;
304	tp->nway = 0;
305	tp->nwayset = 1;
306
307	/* set to 10baseTx-HD - see Data Port Selection
308	* comment given at the top of the file
309	*/
310	tp->csr6 = (ioread32(ioaddr + CSR6) & 0xfe3bd1fd);
311	tp->csr6 \|= 0x00400000;
312
313	tulip_restart_rxtx(tp);
314
315	return;
316
317	}
318	}
319
320	if ((tp->nwayset && (csr5 & 0x08000000)
321	&& (dev->if_port == 3 \|\| dev->if_port == 5)
322	&& (csr12 & 2) == 2) \|\| (tp->nway && (csr5 & (TPLnkFail)))) {
323
324	/* Link blew? Maybe restart NWay. */
325
326	if (tulip_debug > 2)
327	printk(KERN_DEBUG "%s: Ugh! Link blew?\n", dev->name);
328
329	del_timer_sync(&tp->timer);
330	pnic2_start_nway(dev);
331	tp->timer.expires = RUN_AT(3*HZ);
332	add_timer(&tp->timer);
333
334	return;
335	}
336
337
338	if (dev->if_port == 3 \|\| dev->if_port == 5) {
339
340	/* we are at 100mb and a potential link change occurred */
341
342	if (tulip_debug > 1)
343	printk(KERN_INFO"%s: PNIC2 %s link beat %s.\n",
344	dev->name, medianame[dev->if_port],
345	(csr12 & 2) ? "failed" : "good");
346
347	/* check 100 link beat */
348
349	tp->nway = 0;
350	tp->nwayset = 1;
351
352	/* if failed then try doing an nway to get in sync */
353	if ((csr12 & 2) && ! tp->medialock) {
354	del_timer_sync(&tp->timer);
355	pnic2_start_nway(dev);
356	tp->timer.expires = RUN_AT(3*HZ);
357	add_timer(&tp->timer);
358	}
359
360	return;
361	}
362
363	if (dev->if_port == 0 \|\| dev->if_port == 4) {
364
365	/* we are at 10mb and a potential link change occurred */
366
367	if (tulip_debug > 1)
368	printk(KERN_INFO"%s: PNIC2 %s link beat %s.\n",
369	dev->name, medianame[dev->if_port],
370	(csr12 & 4) ? "failed" : "good");
371
372
373	tp->nway = 0;
374	tp->nwayset = 1;
375
376	/* if failed, try doing an nway to get in sync */
377	if ((csr12 & 4) && ! tp->medialock) {
378	del_timer_sync(&tp->timer);
379	pnic2_start_nway(dev);
380	tp->timer.expires = RUN_AT(3*HZ);
381	add_timer(&tp->timer);
382	}
383
384	return;
385	}
386
387
388	if (tulip_debug > 1)
389	printk(KERN_INFO"%s: PNIC2 Link Change Default?\n",dev->name);
390
391	/* if all else fails default to trying 10baseT-HD */
392	dev->if_port = 0;
393
394	/* make sure autonegotiate enable is off */
395	csr14 = (ioread32(ioaddr + CSR14) & 0xffffff7f);
396	iowrite32(csr14,ioaddr + CSR14);
397
398	/* set to 10baseTx-HD - see Data Port Selection
399	* comment given at the top of the file
400	*/
401	tp->csr6 = (ioread32(ioaddr + CSR6) & 0xfe3bd1fd);
402	tp->csr6 \|= 0x00400000;
403
404	tulip_restart_rxtx(tp);
405	}
406