404 lines · c
1/*2 drivers/net/ethernet/dec/tulip/pnic2.c3 4 Copyright 2000,2001 The Linux Kernel Team5 Written/copyright 1994-2001 by Donald Becker.6 Modified to hep support PNIC_II by Kevin B. Hendricks7 8 This software may be used and distributed according to the terms9 of the GNU General Public License, incorporated herein by reference.10 11 Please submit bugs to http://bugzilla.kernel.org/ .12*/13 14 15/* Understanding the PNIC_II - everything is this file is based16 * on the PNIC_II_PDF datasheet which is sorely lacking in detail17 *18 * As I understand things, here are the registers and bits that19 * explain the masks and constants used in this file that are20 * either different from the 21142/3 or important for basic operation.21 *22 *23 * CSR 6 (mask = 0xfe3bd1fd of bits not to change)24 * -----25 * Bit 24 - SCR26 * Bit 23 - PCS27 * Bit 22 - TTM (Trasmit Threshold Mode)28 * Bit 18 - Port Select29 * Bit 13 - Start - 1, Stop - 0 Transmissions30 * Bit 11:10 - Loop Back Operation Mode31 * Bit 9 - Full Duplex mode (Advertise 10BaseT-FD is CSR14<7> is set)32 * Bit 1 - Start - 1, Stop - 0 Receive33 *34 *35 * CSR 14 (mask = 0xfff0ee39 of bits not to change)36 * ------37 * Bit 19 - PAUSE-Pause38 * Bit 18 - Advertise T439 * Bit 17 - Advertise 100baseTx-FD40 * Bit 16 - Advertise 100baseTx-HD41 * Bit 12 - LTE - Link Test Enable42 * Bit 7 - ANE - Auto Negotiate Enable43 * Bit 6 - HDE - Advertise 10baseT-HD44 * Bit 2 - Reset to Power down - kept as 1 for normal operation45 * Bit 1 - Loop Back enable for 10baseT MCC46 *47 *48 * CSR 1249 * ------50 * Bit 25 - Partner can do T451 * Bit 24 - Partner can do 100baseTx-FD52 * Bit 23 - Partner can do 100baseTx-HD53 * Bit 22 - Partner can do 10baseT-FD54 * Bit 21 - Partner can do 10baseT-HD55 * Bit 15 - LPN is 1 if all above bits are valid other wise 056 * Bit 14:12 - autonegotiation state (write 001 to start autonegotiate)57 * Bit 3 - Autopolarity state58 * Bit 2 - LS10B - link state of 10baseT 0 - good, 1 - failed59 * Bit 1 - LS100B - link state of 100baseT 0 - good, 1 - failed60 *61 *62 * Data Port Selection Info63 *-------------------------64 *65 * CSR14<7> CSR6<18> CSR6<22> CSR6<23> CSR6<24> MODE/PORT66 * 1 0 0 (X) 0 (X) 1 NWAY67 * 0 0 1 0 (X) 0 10baseT68 * 0 1 0 1 1 (X) 100baseT69 *70 *71 */72 73 74 75#include "tulip.h"76#include <linux/delay.h>77 78 79void pnic2_timer(struct timer_list *t)80{81 struct tulip_private *tp = from_timer(tp, t, timer);82 struct net_device *dev = tp->dev;83 void __iomem *ioaddr = tp->base_addr;84 int next_tick = 60*HZ;85 86 if (tulip_debug > 3)87 dev_info(&dev->dev, "PNIC2 negotiation status %08x\n",88 ioread32(ioaddr + CSR12));89 90 if (next_tick) {91 mod_timer(&tp->timer, RUN_AT(next_tick));92 }93}94 95 96void pnic2_start_nway(struct net_device *dev)97{98 struct tulip_private *tp = netdev_priv(dev);99 void __iomem *ioaddr = tp->base_addr;100 int csr14;101 int csr12;102 103 /* set up what to advertise during the negotiation */104 105 /* load in csr14 and mask off bits not to touch106 * comment at top of file explains mask value107 */108 csr14 = (ioread32(ioaddr + CSR14) & 0xfff0ee39);109 110 /* bit 17 - advetise 100baseTx-FD */111 if (tp->sym_advertise & 0x0100) csr14 |= 0x00020000;112 113 /* bit 16 - advertise 100baseTx-HD */114 if (tp->sym_advertise & 0x0080) csr14 |= 0x00010000;115 116 /* bit 6 - advertise 10baseT-HD */117 if (tp->sym_advertise & 0x0020) csr14 |= 0x00000040;118 119 /* Now set bit 12 Link Test Enable, Bit 7 Autonegotiation Enable120 * and bit 0 Don't PowerDown 10baseT121 */122 csr14 |= 0x00001184;123 124 if (tulip_debug > 1)125 netdev_dbg(dev, "Restarting PNIC2 autonegotiation, csr14=%08x\n",126 csr14);127 128 /* tell pnic2_lnk_change we are doing an nway negotiation */129 dev->if_port = 0;130 tp->nway = tp->mediasense = 1;131 tp->nwayset = tp->lpar = 0;132 133 /* now we have to set up csr6 for NWAY state */134 135 tp->csr6 = ioread32(ioaddr + CSR6);136 if (tulip_debug > 1)137 netdev_dbg(dev, "On Entry to Nway, csr6=%08x\n", tp->csr6);138 139 /* mask off any bits not to touch140 * comment at top of file explains mask value141 */142 tp->csr6 = tp->csr6 & 0xfe3bd1fd;143 144 /* don't forget that bit 9 is also used for advertising */145 /* advertise 10baseT-FD for the negotiation (bit 9) */146 if (tp->sym_advertise & 0x0040) tp->csr6 |= 0x00000200;147 148 /* set bit 24 for nway negotiation mode ...149 * see Data Port Selection comment at top of file150 * and "Stop" - reset both Transmit (bit 13) and Receive (bit 1)151 */152 tp->csr6 |= 0x01000000;153 iowrite32(csr14, ioaddr + CSR14);154 iowrite32(tp->csr6, ioaddr + CSR6);155 udelay(100);156 157 /* all set up so now force the negotiation to begin */158 159 /* read in current values and mask off all but the160 * Autonegotiation bits 14:12. Writing a 001 to those bits161 * should start the autonegotiation162 */163 csr12 = (ioread32(ioaddr + CSR12) & 0xffff8fff);164 csr12 |= 0x1000;165 iowrite32(csr12, ioaddr + CSR12);166}167 168 169 170void pnic2_lnk_change(struct net_device *dev, int csr5)171{172 struct tulip_private *tp = netdev_priv(dev);173 void __iomem *ioaddr = tp->base_addr;174 int csr14;175 176 /* read the staus register to find out what is up */177 int csr12 = ioread32(ioaddr + CSR12);178 179 if (tulip_debug > 1)180 dev_info(&dev->dev,181 "PNIC2 link status interrupt %08x, CSR5 %x, %08x\n",182 csr12, csr5, ioread32(ioaddr + CSR14));183 184 /* If NWay finished and we have a negotiated partner capability.185 * check bits 14:12 for bit pattern 101 - all is good186 */187 if (tp->nway && !tp->nwayset) {188 189 /* we did an auto negotiation */190 191 if ((csr12 & 0x7000) == 0x5000) {192 193 /* negotiation ended successfully */194 195 /* get the link partners reply and mask out all but196 * bits 24-21 which show the partners capabilities197 * and match those to what we advertised198 *199 * then begin to interpret the results of the negotiation.200 * Always go in this order : (we are ignoring T4 for now)201 * 100baseTx-FD, 100baseTx-HD, 10baseT-FD, 10baseT-HD202 */203 204 int negotiated = ((csr12 >> 16) & 0x01E0) & tp->sym_advertise;205 tp->lpar = (csr12 >> 16);206 tp->nwayset = 1;207 208 if (negotiated & 0x0100) dev->if_port = 5;209 else if (negotiated & 0x0080) dev->if_port = 3;210 else if (negotiated & 0x0040) dev->if_port = 4;211 else if (negotiated & 0x0020) dev->if_port = 0;212 else {213 if (tulip_debug > 1)214 dev_info(&dev->dev,215 "funny autonegotiate result csr12 %08x advertising %04x\n",216 csr12, tp->sym_advertise);217 tp->nwayset = 0;218 /* so check if 100baseTx link state is okay */219 if ((csr12 & 2) == 0 && (tp->sym_advertise & 0x0180))220 dev->if_port = 3;221 }222 223 /* now record the duplex that was negotiated */224 tp->full_duplex = 0;225 if ((dev->if_port == 4) || (dev->if_port == 5))226 tp->full_duplex = 1;227 228 if (tulip_debug > 1) {229 if (tp->nwayset)230 dev_info(&dev->dev,231 "Switching to %s based on link negotiation %04x & %04x = %04x\n",232 medianame[dev->if_port],233 tp->sym_advertise, tp->lpar,234 negotiated);235 }236 237 /* remember to turn off bit 7 - autonegotiate238 * enable so we can properly end nway mode and239 * set duplex (ie. use csr6<9> again)240 */241 csr14 = (ioread32(ioaddr + CSR14) & 0xffffff7f);242 iowrite32(csr14,ioaddr + CSR14);243 244 245 /* now set the data port and operating mode246 * (see the Data Port Selection comments at247 * the top of the file248 */249 250 /* get current csr6 and mask off bits not to touch */251 /* see comment at top of file */252 253 tp->csr6 = (ioread32(ioaddr + CSR6) & 0xfe3bd1fd);254 255 /* so if using if_port 3 or 5 then select the 100baseT256 * port else select the 10baseT port.257 * See the Data Port Selection table at the top258 * of the file which was taken from the PNIC_II.PDF259 * datasheet260 */261 if (dev->if_port & 1) tp->csr6 |= 0x01840000;262 else tp->csr6 |= 0x00400000;263 264 /* now set the full duplex bit appropriately */265 if (tp->full_duplex) tp->csr6 |= 0x00000200;266 267 iowrite32(1, ioaddr + CSR13);268 269 if (tulip_debug > 2)270 netdev_dbg(dev, "Setting CSR6 %08x/%x CSR12 %08x\n",271 tp->csr6,272 ioread32(ioaddr + CSR6),273 ioread32(ioaddr + CSR12));274 275 /* now the following actually writes out the276 * new csr6 values277 */278 tulip_start_rxtx(tp);279 280 return;281 282 } else {283 dev_info(&dev->dev,284 "Autonegotiation failed, using %s, link beat status %04x\n",285 medianame[dev->if_port], csr12);286 287 /* remember to turn off bit 7 - autonegotiate288 * enable so we don't forget289 */290 csr14 = (ioread32(ioaddr + CSR14) & 0xffffff7f);291 iowrite32(csr14,ioaddr + CSR14);292 293 /* what should we do when autonegotiate fails?294 * should we try again or default to baseline295 * case. I just don't know.296 *297 * for now default to some baseline case298 */299 300 dev->if_port = 0;301 tp->nway = 0;302 tp->nwayset = 1;303 304 /* set to 10baseTx-HD - see Data Port Selection305 * comment given at the top of the file306 */307 tp->csr6 = (ioread32(ioaddr + CSR6) & 0xfe3bd1fd);308 tp->csr6 |= 0x00400000;309 310 tulip_restart_rxtx(tp);311 312 return;313 314 }315 }316 317 if ((tp->nwayset && (csr5 & 0x08000000) &&318 (dev->if_port == 3 || dev->if_port == 5) &&319 (csr12 & 2) == 2) || (tp->nway && (csr5 & (TPLnkFail)))) {320 321 /* Link blew? Maybe restart NWay. */322 323 if (tulip_debug > 2)324 netdev_dbg(dev, "Ugh! Link blew?\n");325 326 del_timer_sync(&tp->timer);327 pnic2_start_nway(dev);328 tp->timer.expires = RUN_AT(3*HZ);329 add_timer(&tp->timer);330 331 return;332 }333 334 335 if (dev->if_port == 3 || dev->if_port == 5) {336 337 /* we are at 100mb and a potential link change occurred */338 339 if (tulip_debug > 1)340 dev_info(&dev->dev, "PNIC2 %s link beat %s\n",341 medianame[dev->if_port],342 (csr12 & 2) ? "failed" : "good");343 344 /* check 100 link beat */345 346 tp->nway = 0;347 tp->nwayset = 1;348 349 /* if failed then try doing an nway to get in sync */350 if ((csr12 & 2) && ! tp->medialock) {351 del_timer_sync(&tp->timer);352 pnic2_start_nway(dev);353 tp->timer.expires = RUN_AT(3*HZ);354 add_timer(&tp->timer);355 }356 357 return;358 }359 360 if (dev->if_port == 0 || dev->if_port == 4) {361 362 /* we are at 10mb and a potential link change occurred */363 364 if (tulip_debug > 1)365 dev_info(&dev->dev, "PNIC2 %s link beat %s\n",366 medianame[dev->if_port],367 (csr12 & 4) ? "failed" : "good");368 369 370 tp->nway = 0;371 tp->nwayset = 1;372 373 /* if failed, try doing an nway to get in sync */374 if ((csr12 & 4) && ! tp->medialock) {375 del_timer_sync(&tp->timer);376 pnic2_start_nway(dev);377 tp->timer.expires = RUN_AT(3*HZ);378 add_timer(&tp->timer);379 }380 381 return;382 }383 384 385 if (tulip_debug > 1)386 dev_info(&dev->dev, "PNIC2 Link Change Default?\n");387 388 /* if all else fails default to trying 10baseT-HD */389 dev->if_port = 0;390 391 /* make sure autonegotiate enable is off */392 csr14 = (ioread32(ioaddr + CSR14) & 0xffffff7f);393 iowrite32(csr14,ioaddr + CSR14);394 395 /* set to 10baseTx-HD - see Data Port Selection396 * comment given at the top of the file397 */398 tp->csr6 = (ioread32(ioaddr + CSR6) & 0xfe3bd1fd);399 tp->csr6 |= 0x00400000;400 401 tulip_restart_rxtx(tp);402}403 404