1/* 2 drivers/net/tulip/pnic2.c 3 4 Maintained by Valerie Henson <val_henson@linux.intel.com> 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 79#include "tulip.h" 80#include <linux/delay.h> 81 82 83void 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 100void 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 175void 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 201 * bits 24-21 which show the partners capabilities 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