1 /* 2 drivers/net/ethernet/dec/tulip/pnic2.c 3 4 Copyright 2000,2001 The Linux Kernel Team 5 Written/copyright 1994-2001 by Donald Becker. 6 Modified to hep support PNIC_II by Kevin B. Hendricks 7 8 This software may be used and distributed according to the terms 9 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 based 16 * on the PNIC_II_PDF datasheet which is sorely lacking in detail 17 * 18 * As I understand things, here are the registers and bits that 19 * explain the masks and constants used in this file that are 20 * 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 - SCR 26 * Bit 23 - PCS 27 * Bit 22 - TTM (Trasmit Threshold Mode) 28 * Bit 18 - Port Select 29 * Bit 13 - Start - 1, Stop - 0 Transmissions 30 * Bit 11:10 - Loop Back Operation Mode 31 * Bit 9 - Full Duplex mode (Advertise 10BaseT-FD is CSR14<7> is set) 32 * Bit 1 - Start - 1, Stop - 0 Receive 33 * 34 * 35 * CSR 14 (mask = 0xfff0ee39 of bits not to change) 36 * ------ 37 * Bit 19 - PAUSE-Pause 38 * Bit 18 - Advertise T4 39 * Bit 17 - Advertise 100baseTx-FD 40 * Bit 16 - Advertise 100baseTx-HD 41 * Bit 12 - LTE - Link Test Enable 42 * Bit 7 - ANE - Auto Negotiate Enable 43 * Bit 6 - HDE - Advertise 10baseT-HD 44 * Bit 2 - Reset to Power down - kept as 1 for normal operation 45 * Bit 1 - Loop Back enable for 10baseT MCC 46 * 47 * 48 * CSR 12 49 * ------ 50 * Bit 25 - Partner can do T4 51 * Bit 24 - Partner can do 100baseTx-FD 52 * Bit 23 - Partner can do 100baseTx-HD 53 * Bit 22 - Partner can do 10baseT-FD 54 * Bit 21 - Partner can do 10baseT-HD 55 * Bit 15 - LPN is 1 if all above bits are valid other wise 0 56 * Bit 14:12 - autonegotiation state (write 001 to start autonegotiate) 57 * Bit 3 - Autopolarity state 58 * Bit 2 - LS10B - link state of 10baseT 0 - good, 1 - failed 59 * Bit 1 - LS100B - link state of 100baseT 0 - good, 1 - failed 60 * 61 * 62 * Data Port Selection Info 63 *------------------------- 64 * 65 * CSR14<7> CSR6<18> CSR6<22> CSR6<23> CSR6<24> MODE/PORT 66 * 1 0 0 (X) 0 (X) 1 NWAY 67 * 0 0 1 0 (X) 0 10baseT 68 * 0 1 0 1 1 (X) 100baseT 69 * 70 * 71 */ 72 73 74 75 #include "tulip.h" 76 #include <linux/delay.h> 77 78 79 void 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 96 void 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 touch 106 * comment at top of file explains mask value 107 */ 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 Enable 120 * and bit 0 Don't PowerDown 10baseT 121 */ 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 touch 140 * comment at top of file explains mask value 141 */ 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 file 150 * 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 the 160 * Autonegotiation bits 14:12. Writing a 001 to those bits 161 * should start the autonegotiation 162 */ 163 csr12 = (ioread32(ioaddr + CSR12) & 0xffff8fff); 164 csr12 |= 0x1000; 165 iowrite32(csr12, ioaddr + CSR12); 166 } 167 168 169 170 void 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 good 186 */ 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 but 196 * bits 24-21 which show the partners capabilities 197 * and match those to what we advertised 198 * 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-HD 202 */ 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 - autonegotiate 238 * enable so we can properly end nway mode and 239 * 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 mode 246 * (see the Data Port Selection comments at 247 * the top of the file 248 */ 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 100baseT 256 * port else select the 10baseT port. 257 * See the Data Port Selection table at the top 258 * of the file which was taken from the PNIC_II.PDF 259 * datasheet 260 */ 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 the 276 * new csr6 values 277 */ 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 - autonegotiate 288 * enable so we don't forget 289 */ 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 baseline 295 * case. I just don't know. 296 * 297 * for now default to some baseline case 298 */ 299 300 dev->if_port = 0; 301 tp->nway = 0; 302 tp->nwayset = 1; 303 304 /* set to 10baseTx-HD - see Data Port Selection 305 * comment given at the top of the file 306 */ 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 Selection 396 * comment given at the top of the file 397 */ 398 tp->csr6 = (ioread32(ioaddr + CSR6) & 0xfe3bd1fd); 399 tp->csr6 |= 0x00400000; 400 401 tulip_restart_rxtx(tp); 402 } 403 404