1 /* 2 drivers/net/ethernet/dec/tulip/media.c 3 4 Copyright 2000,2001 The Linux Kernel Team 5 Written/copyright 1994-2001 by Donald Becker. 6 7 This software may be used and distributed according to the terms 8 of the GNU General Public License, incorporated herein by reference. 9 10 Please submit bugs to http://bugzilla.kernel.org/ . 11 */ 12 13 #include <linux/kernel.h> 14 #include <linux/mii.h> 15 #include <linux/delay.h> 16 #include <linux/pci.h> 17 #include "tulip.h" 18 19 20 /* The maximum data clock rate is 2.5 Mhz. The minimum timing is usually 21 met by back-to-back PCI I/O cycles, but we insert a delay to avoid 22 "overclocking" issues or future 66Mhz PCI. */ 23 #define mdio_delay() ioread32(mdio_addr) 24 25 /* Read and write the MII registers using software-generated serial 26 MDIO protocol. It is just different enough from the EEPROM protocol 27 to not share code. The maxium data clock rate is 2.5 Mhz. */ 28 #define MDIO_SHIFT_CLK 0x10000 29 #define MDIO_DATA_WRITE0 0x00000 30 #define MDIO_DATA_WRITE1 0x20000 31 #define MDIO_ENB 0x00000 /* Ignore the 0x02000 databook setting. */ 32 #define MDIO_ENB_IN 0x40000 33 #define MDIO_DATA_READ 0x80000 34 35 static const unsigned char comet_miireg2offset[32] = { 36 0xB4, 0xB8, 0xBC, 0xC0, 0xC4, 0xC8, 0xCC, 0, 0,0,0,0, 0,0,0,0, 37 0,0xD0,0,0, 0,0,0,0, 0,0,0,0, 0, 0xD4, 0xD8, 0xDC, }; 38 39 40 /* MII transceiver control section. 41 Read and write the MII registers using software-generated serial 42 MDIO protocol. 43 See IEEE 802.3-2002.pdf (Section 2, Chapter "22.2.4 Management functions") 44 or DP83840A data sheet for more details. 45 */ 46 47 int tulip_mdio_read(struct net_device *dev, int phy_id, int location) 48 { 49 struct tulip_private *tp = netdev_priv(dev); 50 int i; 51 int read_cmd = (0xf6 << 10) | ((phy_id & 0x1f) << 5) | location; 52 int retval = 0; 53 void __iomem *ioaddr = tp->base_addr; 54 void __iomem *mdio_addr = ioaddr + CSR9; 55 unsigned long flags; 56 57 if (location & ~0x1f) 58 return 0xffff; 59 60 if (tp->chip_id == COMET && phy_id == 30) { 61 if (comet_miireg2offset[location]) 62 return ioread32(ioaddr + comet_miireg2offset[location]); 63 return 0xffff; 64 } 65 66 spin_lock_irqsave(&tp->mii_lock, flags); 67 if (tp->chip_id == LC82C168) { 68 iowrite32(0x60020000 + (phy_id<<23) + (location<<18), ioaddr + 0xA0); 69 ioread32(ioaddr + 0xA0); 70 ioread32(ioaddr + 0xA0); 71 for (i = 1000; i >= 0; --i) { 72 barrier(); 73 if ( ! ((retval = ioread32(ioaddr + 0xA0)) & 0x80000000)) 74 break; 75 } 76 spin_unlock_irqrestore(&tp->mii_lock, flags); 77 return retval & 0xffff; 78 } 79 80 /* Establish sync by sending at least 32 logic ones. */ 81 for (i = 32; i >= 0; i--) { 82 iowrite32(MDIO_ENB | MDIO_DATA_WRITE1, mdio_addr); 83 mdio_delay(); 84 iowrite32(MDIO_ENB | MDIO_DATA_WRITE1 | MDIO_SHIFT_CLK, mdio_addr); 85 mdio_delay(); 86 } 87 /* Shift the read command bits out. */ 88 for (i = 15; i >= 0; i--) { 89 int dataval = (read_cmd & (1 << i)) ? MDIO_DATA_WRITE1 : 0; 90 91 iowrite32(MDIO_ENB | dataval, mdio_addr); 92 mdio_delay(); 93 iowrite32(MDIO_ENB | dataval | MDIO_SHIFT_CLK, mdio_addr); 94 mdio_delay(); 95 } 96 /* Read the two transition, 16 data, and wire-idle bits. */ 97 for (i = 19; i > 0; i--) { 98 iowrite32(MDIO_ENB_IN, mdio_addr); 99 mdio_delay(); 100 retval = (retval << 1) | ((ioread32(mdio_addr) & MDIO_DATA_READ) ? 1 : 0); 101 iowrite32(MDIO_ENB_IN | MDIO_SHIFT_CLK, mdio_addr); 102 mdio_delay(); 103 } 104 105 spin_unlock_irqrestore(&tp->mii_lock, flags); 106 return (retval>>1) & 0xffff; 107 } 108 109 void tulip_mdio_write(struct net_device *dev, int phy_id, int location, int val) 110 { 111 struct tulip_private *tp = netdev_priv(dev); 112 int i; 113 int cmd = (0x5002 << 16) | ((phy_id & 0x1f) << 23) | (location<<18) | (val & 0xffff); 114 void __iomem *ioaddr = tp->base_addr; 115 void __iomem *mdio_addr = ioaddr + CSR9; 116 unsigned long flags; 117 118 if (location & ~0x1f) 119 return; 120 121 if (tp->chip_id == COMET && phy_id == 30) { 122 if (comet_miireg2offset[location]) 123 iowrite32(val, ioaddr + comet_miireg2offset[location]); 124 return; 125 } 126 127 spin_lock_irqsave(&tp->mii_lock, flags); 128 if (tp->chip_id == LC82C168) { 129 iowrite32(cmd, ioaddr + 0xA0); 130 for (i = 1000; i >= 0; --i) { 131 barrier(); 132 if ( ! (ioread32(ioaddr + 0xA0) & 0x80000000)) 133 break; 134 } 135 spin_unlock_irqrestore(&tp->mii_lock, flags); 136 return; 137 } 138 139 /* Establish sync by sending 32 logic ones. */ 140 for (i = 32; i >= 0; i--) { 141 iowrite32(MDIO_ENB | MDIO_DATA_WRITE1, mdio_addr); 142 mdio_delay(); 143 iowrite32(MDIO_ENB | MDIO_DATA_WRITE1 | MDIO_SHIFT_CLK, mdio_addr); 144 mdio_delay(); 145 } 146 /* Shift the command bits out. */ 147 for (i = 31; i >= 0; i--) { 148 int dataval = (cmd & (1 << i)) ? MDIO_DATA_WRITE1 : 0; 149 iowrite32(MDIO_ENB | dataval, mdio_addr); 150 mdio_delay(); 151 iowrite32(MDIO_ENB | dataval | MDIO_SHIFT_CLK, mdio_addr); 152 mdio_delay(); 153 } 154 /* Clear out extra bits. */ 155 for (i = 2; i > 0; i--) { 156 iowrite32(MDIO_ENB_IN, mdio_addr); 157 mdio_delay(); 158 iowrite32(MDIO_ENB_IN | MDIO_SHIFT_CLK, mdio_addr); 159 mdio_delay(); 160 } 161 162 spin_unlock_irqrestore(&tp->mii_lock, flags); 163 } 164 165 166 /* Set up the transceiver control registers for the selected media type. */ 167 void tulip_select_media(struct net_device *dev, int startup) 168 { 169 struct tulip_private *tp = netdev_priv(dev); 170 void __iomem *ioaddr = tp->base_addr; 171 struct mediatable *mtable = tp->mtable; 172 u32 new_csr6; 173 int i; 174 175 if (mtable) { 176 struct medialeaf *mleaf = &mtable->mleaf[tp->cur_index]; 177 unsigned char *p = mleaf->leafdata; 178 switch (mleaf->type) { 179 case 0: /* 21140 non-MII xcvr. */ 180 if (tulip_debug > 1) 181 netdev_dbg(dev, "Using a 21140 non-MII transceiver with control setting %02x\n", 182 p[1]); 183 dev->if_port = p[0]; 184 if (startup) 185 iowrite32(mtable->csr12dir | 0x100, ioaddr + CSR12); 186 iowrite32(p[1], ioaddr + CSR12); 187 new_csr6 = 0x02000000 | ((p[2] & 0x71) << 18); 188 break; 189 case 2: case 4: { 190 u16 setup[5]; 191 u32 csr13val, csr14val, csr15dir, csr15val; 192 for (i = 0; i < 5; i++) 193 setup[i] = get_u16(&p[i*2 + 1]); 194 195 dev->if_port = p[0] & MEDIA_MASK; 196 if (tulip_media_cap[dev->if_port] & MediaAlwaysFD) 197 tp->full_duplex = 1; 198 199 if (startup && mtable->has_reset) { 200 struct medialeaf *rleaf = &mtable->mleaf[mtable->has_reset]; 201 unsigned char *rst = rleaf->leafdata; 202 if (tulip_debug > 1) 203 netdev_dbg(dev, "Resetting the transceiver\n"); 204 for (i = 0; i < rst[0]; i++) 205 iowrite32(get_u16(rst + 1 + (i<<1)) << 16, ioaddr + CSR15); 206 } 207 if (tulip_debug > 1) 208 netdev_dbg(dev, "21143 non-MII %s transceiver control %04x/%04x\n", 209 medianame[dev->if_port], 210 setup[0], setup[1]); 211 if (p[0] & 0x40) { /* SIA (CSR13-15) setup values are provided. */ 212 csr13val = setup[0]; 213 csr14val = setup[1]; 214 csr15dir = (setup[3]<<16) | setup[2]; 215 csr15val = (setup[4]<<16) | setup[2]; 216 iowrite32(0, ioaddr + CSR13); 217 iowrite32(csr14val, ioaddr + CSR14); 218 iowrite32(csr15dir, ioaddr + CSR15); /* Direction */ 219 iowrite32(csr15val, ioaddr + CSR15); /* Data */ 220 iowrite32(csr13val, ioaddr + CSR13); 221 } else { 222 csr13val = 1; 223 csr14val = 0; 224 csr15dir = (setup[0]<<16) | 0x0008; 225 csr15val = (setup[1]<<16) | 0x0008; 226 if (dev->if_port <= 4) 227 csr14val = t21142_csr14[dev->if_port]; 228 if (startup) { 229 iowrite32(0, ioaddr + CSR13); 230 iowrite32(csr14val, ioaddr + CSR14); 231 } 232 iowrite32(csr15dir, ioaddr + CSR15); /* Direction */ 233 iowrite32(csr15val, ioaddr + CSR15); /* Data */ 234 if (startup) iowrite32(csr13val, ioaddr + CSR13); 235 } 236 if (tulip_debug > 1) 237 netdev_dbg(dev, "Setting CSR15 to %08x/%08x\n", 238 csr15dir, csr15val); 239 if (mleaf->type == 4) 240 new_csr6 = 0x82020000 | ((setup[2] & 0x71) << 18); 241 else 242 new_csr6 = 0x82420000; 243 break; 244 } 245 case 1: case 3: { 246 int phy_num = p[0]; 247 int init_length = p[1]; 248 u16 *misc_info, tmp_info; 249 250 dev->if_port = 11; 251 new_csr6 = 0x020E0000; 252 if (mleaf->type == 3) { /* 21142 */ 253 u16 *init_sequence = (u16*)(p+2); 254 u16 *reset_sequence = &((u16*)(p+3))[init_length]; 255 int reset_length = p[2 + init_length*2]; 256 misc_info = reset_sequence + reset_length; 257 if (startup) { 258 int timeout = 10; /* max 1 ms */ 259 for (i = 0; i < reset_length; i++) 260 iowrite32(get_u16(&reset_sequence[i]) << 16, ioaddr + CSR15); 261 262 /* flush posted writes */ 263 ioread32(ioaddr + CSR15); 264 265 /* Sect 3.10.3 in DP83840A.pdf (p39) */ 266 udelay(500); 267 268 /* Section 4.2 in DP83840A.pdf (p43) */ 269 /* and IEEE 802.3 "22.2.4.1.1 Reset" */ 270 while (timeout-- && 271 (tulip_mdio_read (dev, phy_num, MII_BMCR) & BMCR_RESET)) 272 udelay(100); 273 } 274 for (i = 0; i < init_length; i++) 275 iowrite32(get_u16(&init_sequence[i]) << 16, ioaddr + CSR15); 276 277 ioread32(ioaddr + CSR15); /* flush posted writes */ 278 } else { 279 u8 *init_sequence = p + 2; 280 u8 *reset_sequence = p + 3 + init_length; 281 int reset_length = p[2 + init_length]; 282 misc_info = (u16*)(reset_sequence + reset_length); 283 if (startup) { 284 int timeout = 10; /* max 1 ms */ 285 iowrite32(mtable->csr12dir | 0x100, ioaddr + CSR12); 286 for (i = 0; i < reset_length; i++) 287 iowrite32(reset_sequence[i], ioaddr + CSR12); 288 289 /* flush posted writes */ 290 ioread32(ioaddr + CSR12); 291 292 /* Sect 3.10.3 in DP83840A.pdf (p39) */ 293 udelay(500); 294 295 /* Section 4.2 in DP83840A.pdf (p43) */ 296 /* and IEEE 802.3 "22.2.4.1.1 Reset" */ 297 while (timeout-- && 298 (tulip_mdio_read (dev, phy_num, MII_BMCR) & BMCR_RESET)) 299 udelay(100); 300 } 301 for (i = 0; i < init_length; i++) 302 iowrite32(init_sequence[i], ioaddr + CSR12); 303 304 ioread32(ioaddr + CSR12); /* flush posted writes */ 305 } 306 307 tmp_info = get_u16(&misc_info[1]); 308 if (tmp_info) 309 tp->advertising[phy_num] = tmp_info | 1; 310 if (tmp_info && startup < 2) { 311 if (tp->mii_advertise == 0) 312 tp->mii_advertise = tp->advertising[phy_num]; 313 if (tulip_debug > 1) 314 netdev_dbg(dev, " Advertising %04x on MII %d\n", 315 tp->mii_advertise, 316 tp->phys[phy_num]); 317 tulip_mdio_write(dev, tp->phys[phy_num], 4, tp->mii_advertise); 318 } 319 break; 320 } 321 case 5: case 6: { 322 u16 setup[5]; 323 324 new_csr6 = 0; /* FIXME */ 325 326 for (i = 0; i < 5; i++) 327 setup[i] = get_u16(&p[i*2 + 1]); 328 329 if (startup && mtable->has_reset) { 330 struct medialeaf *rleaf = &mtable->mleaf[mtable->has_reset]; 331 unsigned char *rst = rleaf->leafdata; 332 if (tulip_debug > 1) 333 netdev_dbg(dev, "Resetting the transceiver\n"); 334 for (i = 0; i < rst[0]; i++) 335 iowrite32(get_u16(rst + 1 + (i<<1)) << 16, ioaddr + CSR15); 336 } 337 338 break; 339 } 340 default: 341 netdev_dbg(dev, " Invalid media table selection %d\n", 342 mleaf->type); 343 new_csr6 = 0x020E0000; 344 } 345 if (tulip_debug > 1) 346 netdev_dbg(dev, "Using media type %s, CSR12 is %02x\n", 347 medianame[dev->if_port], 348 ioread32(ioaddr + CSR12) & 0xff); 349 } else if (tp->chip_id == LC82C168) { 350 if (startup && ! tp->medialock) 351 dev->if_port = tp->mii_cnt ? 11 : 0; 352 if (tulip_debug > 1) 353 netdev_dbg(dev, "PNIC PHY status is %3.3x, media %s\n", 354 ioread32(ioaddr + 0xB8), 355 medianame[dev->if_port]); 356 if (tp->mii_cnt) { 357 new_csr6 = 0x810C0000; 358 iowrite32(0x0001, ioaddr + CSR15); 359 iowrite32(0x0201B07A, ioaddr + 0xB8); 360 } else if (startup) { 361 /* Start with 10mbps to do autonegotiation. */ 362 iowrite32(0x32, ioaddr + CSR12); 363 new_csr6 = 0x00420000; 364 iowrite32(0x0001B078, ioaddr + 0xB8); 365 iowrite32(0x0201B078, ioaddr + 0xB8); 366 } else if (dev->if_port == 3 || dev->if_port == 5) { 367 iowrite32(0x33, ioaddr + CSR12); 368 new_csr6 = 0x01860000; 369 /* Trigger autonegotiation. */ 370 iowrite32(startup ? 0x0201F868 : 0x0001F868, ioaddr + 0xB8); 371 } else { 372 iowrite32(0x32, ioaddr + CSR12); 373 new_csr6 = 0x00420000; 374 iowrite32(0x1F078, ioaddr + 0xB8); 375 } 376 } else { /* Unknown chip type with no media table. */ 377 if (tp->default_port == 0) 378 dev->if_port = tp->mii_cnt ? 11 : 3; 379 if (tulip_media_cap[dev->if_port] & MediaIsMII) { 380 new_csr6 = 0x020E0000; 381 } else if (tulip_media_cap[dev->if_port] & MediaIsFx) { 382 new_csr6 = 0x02860000; 383 } else 384 new_csr6 = 0x03860000; 385 if (tulip_debug > 1) 386 netdev_dbg(dev, "No media description table, assuming %s transceiver, CSR12 %02x\n", 387 medianame[dev->if_port], 388 ioread32(ioaddr + CSR12)); 389 } 390 391 tp->csr6 = new_csr6 | (tp->csr6 & 0xfdff) | (tp->full_duplex ? 0x0200 : 0); 392 393 mdelay(1); 394 } 395 396 /* 397 Check the MII negotiated duplex and change the CSR6 setting if 398 required. 399 Return 0 if everything is OK. 400 Return < 0 if the transceiver is missing or has no link beat. 401 */ 402 int tulip_check_duplex(struct net_device *dev) 403 { 404 struct tulip_private *tp = netdev_priv(dev); 405 unsigned int bmsr, lpa, negotiated, new_csr6; 406 407 bmsr = tulip_mdio_read(dev, tp->phys[0], MII_BMSR); 408 lpa = tulip_mdio_read(dev, tp->phys[0], MII_LPA); 409 if (tulip_debug > 1) 410 dev_info(&dev->dev, "MII status %04x, Link partner report %04x\n", 411 bmsr, lpa); 412 if (bmsr == 0xffff) 413 return -2; 414 if ((bmsr & BMSR_LSTATUS) == 0) { 415 int new_bmsr = tulip_mdio_read(dev, tp->phys[0], MII_BMSR); 416 if ((new_bmsr & BMSR_LSTATUS) == 0) { 417 if (tulip_debug > 1) 418 dev_info(&dev->dev, 419 "No link beat on the MII interface, status %04x\n", 420 new_bmsr); 421 return -1; 422 } 423 } 424 negotiated = lpa & tp->advertising[0]; 425 tp->full_duplex = mii_duplex(tp->full_duplex_lock, negotiated); 426 427 new_csr6 = tp->csr6; 428 429 if (negotiated & LPA_100) new_csr6 &= ~TxThreshold; 430 else new_csr6 |= TxThreshold; 431 if (tp->full_duplex) new_csr6 |= FullDuplex; 432 else new_csr6 &= ~FullDuplex; 433 434 if (new_csr6 != tp->csr6) { 435 tp->csr6 = new_csr6; 436 tulip_restart_rxtx(tp); 437 438 if (tulip_debug > 0) 439 dev_info(&dev->dev, 440 "Setting %s-duplex based on MII#%d link partner capability of %04x\n", 441 tp->full_duplex ? "full" : "half", 442 tp->phys[0], lpa); 443 return 1; 444 } 445 446 return 0; 447 } 448 449 void tulip_find_mii(struct net_device *dev, int board_idx) 450 { 451 struct tulip_private *tp = netdev_priv(dev); 452 int phyn, phy_idx = 0; 453 int mii_reg0; 454 int mii_advert; 455 unsigned int to_advert, new_bmcr, ane_switch; 456 457 /* Find the connected MII xcvrs. 458 Doing this in open() would allow detecting external xcvrs later, 459 but takes much time. */ 460 for (phyn = 1; phyn <= 32 && phy_idx < ARRAY_SIZE(tp->phys); phyn++) { 461 int phy = phyn & 0x1f; 462 int mii_status = tulip_mdio_read (dev, phy, MII_BMSR); 463 if ((mii_status & 0x8301) == 0x8001 || 464 ((mii_status & BMSR_100BASE4) == 0 && 465 (mii_status & 0x7800) != 0)) { 466 /* preserve Becker logic, gain indentation level */ 467 } else { 468 continue; 469 } 470 471 mii_reg0 = tulip_mdio_read (dev, phy, MII_BMCR); 472 mii_advert = tulip_mdio_read (dev, phy, MII_ADVERTISE); 473 ane_switch = 0; 474 475 /* if not advertising at all, gen an 476 * advertising value from the capability 477 * bits in BMSR 478 */ 479 if ((mii_advert & ADVERTISE_ALL) == 0) { 480 unsigned int tmpadv = tulip_mdio_read (dev, phy, MII_BMSR); 481 mii_advert = ((tmpadv >> 6) & 0x3e0) | 1; 482 } 483 484 if (tp->mii_advertise) { 485 tp->advertising[phy_idx] = 486 to_advert = tp->mii_advertise; 487 } else if (tp->advertising[phy_idx]) { 488 to_advert = tp->advertising[phy_idx]; 489 } else { 490 tp->advertising[phy_idx] = 491 tp->mii_advertise = 492 to_advert = mii_advert; 493 } 494 495 tp->phys[phy_idx++] = phy; 496 497 pr_info("tulip%d: MII transceiver #%d config %04x status %04x advertising %04x\n", 498 board_idx, phy, mii_reg0, mii_status, mii_advert); 499 500 /* Fixup for DLink with miswired PHY. */ 501 if (mii_advert != to_advert) { 502 pr_debug("tulip%d: Advertising %04x on PHY %d, previously advertising %04x\n", 503 board_idx, to_advert, phy, mii_advert); 504 tulip_mdio_write (dev, phy, 4, to_advert); 505 } 506 507 /* Enable autonegotiation: some boards default to off. */ 508 if (tp->default_port == 0) { 509 new_bmcr = mii_reg0 | BMCR_ANENABLE; 510 if (new_bmcr != mii_reg0) { 511 new_bmcr |= BMCR_ANRESTART; 512 ane_switch = 1; 513 } 514 } 515 /* ...or disable nway, if forcing media */ 516 else { 517 new_bmcr = mii_reg0 & ~BMCR_ANENABLE; 518 if (new_bmcr != mii_reg0) 519 ane_switch = 1; 520 } 521 522 /* clear out bits we never want at this point */ 523 new_bmcr &= ~(BMCR_CTST | BMCR_FULLDPLX | BMCR_ISOLATE | 524 BMCR_PDOWN | BMCR_SPEED100 | BMCR_LOOPBACK | 525 BMCR_RESET); 526 527 if (tp->full_duplex) 528 new_bmcr |= BMCR_FULLDPLX; 529 if (tulip_media_cap[tp->default_port] & MediaIs100) 530 new_bmcr |= BMCR_SPEED100; 531 532 if (new_bmcr != mii_reg0) { 533 /* some phys need the ANE switch to 534 * happen before forced media settings 535 * will "take." However, we write the 536 * same value twice in order not to 537 * confuse the sane phys. 538 */ 539 if (ane_switch) { 540 tulip_mdio_write (dev, phy, MII_BMCR, new_bmcr); 541 udelay (10); 542 } 543 tulip_mdio_write (dev, phy, MII_BMCR, new_bmcr); 544 } 545 } 546 tp->mii_cnt = phy_idx; 547 if (tp->mtable && tp->mtable->has_mii && phy_idx == 0) { 548 pr_info("tulip%d: ***WARNING***: No MII transceiver found!\n", 549 board_idx); 550 tp->phys[0] = 1; 551 } 552 } 553