1 // SPDX-License-Identifier: GPL-2.0 2 /* Driver for the Texas Instruments DP83867 PHY 3 * 4 * Copyright (C) 2015 Texas Instruments Inc. 5 */ 6 7 #include <linux/ethtool.h> 8 #include <linux/kernel.h> 9 #include <linux/mii.h> 10 #include <linux/module.h> 11 #include <linux/of.h> 12 #include <linux/phy.h> 13 #include <linux/delay.h> 14 #include <linux/netdevice.h> 15 #include <linux/etherdevice.h> 16 #include <linux/bitfield.h> 17 #include <linux/nvmem-consumer.h> 18 19 #include <dt-bindings/net/ti-dp83867.h> 20 21 #define DP83867_PHY_ID 0x2000a231 22 #define DP83867_DEVADDR 0x1f 23 24 #define MII_DP83867_PHYCTRL 0x10 25 #define MII_DP83867_PHYSTS 0x11 26 #define MII_DP83867_MICR 0x12 27 #define MII_DP83867_ISR 0x13 28 #define DP83867_CFG2 0x14 29 #define DP83867_CFG3 0x1e 30 #define DP83867_CTRL 0x1f 31 32 /* Extended Registers */ 33 #define DP83867_FLD_THR_CFG 0x002e 34 #define DP83867_CFG4 0x0031 35 #define DP83867_CFG4_SGMII_ANEG_MASK (BIT(5) | BIT(6)) 36 #define DP83867_CFG4_SGMII_ANEG_TIMER_11MS (3 << 5) 37 #define DP83867_CFG4_SGMII_ANEG_TIMER_800US (2 << 5) 38 #define DP83867_CFG4_SGMII_ANEG_TIMER_2US (1 << 5) 39 #define DP83867_CFG4_SGMII_ANEG_TIMER_16MS (0 << 5) 40 41 #define DP83867_RGMIICTL 0x0032 42 #define DP83867_STRAP_STS1 0x006E 43 #define DP83867_STRAP_STS2 0x006f 44 #define DP83867_RGMIIDCTL 0x0086 45 #define DP83867_RXFCFG 0x0134 46 #define DP83867_RXFPMD1 0x0136 47 #define DP83867_RXFPMD2 0x0137 48 #define DP83867_RXFPMD3 0x0138 49 #define DP83867_RXFSOP1 0x0139 50 #define DP83867_RXFSOP2 0x013A 51 #define DP83867_RXFSOP3 0x013B 52 #define DP83867_IO_MUX_CFG 0x0170 53 #define DP83867_SGMIICTL 0x00D3 54 #define DP83867_10M_SGMII_CFG 0x016F 55 #define DP83867_10M_SGMII_RATE_ADAPT_MASK BIT(7) 56 57 #define DP83867_SW_RESET BIT(15) 58 #define DP83867_SW_RESTART BIT(14) 59 60 /* MICR Interrupt bits */ 61 #define MII_DP83867_MICR_AN_ERR_INT_EN BIT(15) 62 #define MII_DP83867_MICR_SPEED_CHNG_INT_EN BIT(14) 63 #define MII_DP83867_MICR_DUP_MODE_CHNG_INT_EN BIT(13) 64 #define MII_DP83867_MICR_PAGE_RXD_INT_EN BIT(12) 65 #define MII_DP83867_MICR_AUTONEG_COMP_INT_EN BIT(11) 66 #define MII_DP83867_MICR_LINK_STS_CHNG_INT_EN BIT(10) 67 #define MII_DP83867_MICR_FALSE_CARRIER_INT_EN BIT(8) 68 #define MII_DP83867_MICR_SLEEP_MODE_CHNG_INT_EN BIT(4) 69 #define MII_DP83867_MICR_WOL_INT_EN BIT(3) 70 #define MII_DP83867_MICR_XGMII_ERR_INT_EN BIT(2) 71 #define MII_DP83867_MICR_POL_CHNG_INT_EN BIT(1) 72 #define MII_DP83867_MICR_JABBER_INT_EN BIT(0) 73 74 /* RGMIICTL bits */ 75 #define DP83867_RGMII_TX_CLK_DELAY_EN BIT(1) 76 #define DP83867_RGMII_RX_CLK_DELAY_EN BIT(0) 77 78 /* SGMIICTL bits */ 79 #define DP83867_SGMII_TYPE BIT(14) 80 81 /* RXFCFG bits*/ 82 #define DP83867_WOL_MAGIC_EN BIT(0) 83 #define DP83867_WOL_BCAST_EN BIT(2) 84 #define DP83867_WOL_UCAST_EN BIT(4) 85 #define DP83867_WOL_SEC_EN BIT(5) 86 #define DP83867_WOL_ENH_MAC BIT(7) 87 88 /* STRAP_STS1 bits */ 89 #define DP83867_STRAP_STS1_RESERVED BIT(11) 90 91 /* STRAP_STS2 bits */ 92 #define DP83867_STRAP_STS2_CLK_SKEW_TX_MASK GENMASK(6, 4) 93 #define DP83867_STRAP_STS2_CLK_SKEW_TX_SHIFT 4 94 #define DP83867_STRAP_STS2_CLK_SKEW_RX_MASK GENMASK(2, 0) 95 #define DP83867_STRAP_STS2_CLK_SKEW_RX_SHIFT 0 96 #define DP83867_STRAP_STS2_CLK_SKEW_NONE BIT(2) 97 #define DP83867_STRAP_STS2_STRAP_FLD BIT(10) 98 99 /* PHY CTRL bits */ 100 #define DP83867_PHYCR_TX_FIFO_DEPTH_SHIFT 14 101 #define DP83867_PHYCR_RX_FIFO_DEPTH_SHIFT 12 102 #define DP83867_PHYCR_FIFO_DEPTH_MAX 0x03 103 #define DP83867_PHYCR_TX_FIFO_DEPTH_MASK GENMASK(15, 14) 104 #define DP83867_PHYCR_RX_FIFO_DEPTH_MASK GENMASK(13, 12) 105 #define DP83867_PHYCR_RESERVED_MASK BIT(11) 106 #define DP83867_PHYCR_FORCE_LINK_GOOD BIT(10) 107 108 /* RGMIIDCTL bits */ 109 #define DP83867_RGMII_TX_CLK_DELAY_MAX 0xf 110 #define DP83867_RGMII_TX_CLK_DELAY_SHIFT 4 111 #define DP83867_RGMII_TX_CLK_DELAY_INV (DP83867_RGMII_TX_CLK_DELAY_MAX + 1) 112 #define DP83867_RGMII_RX_CLK_DELAY_MAX 0xf 113 #define DP83867_RGMII_RX_CLK_DELAY_SHIFT 0 114 #define DP83867_RGMII_RX_CLK_DELAY_INV (DP83867_RGMII_RX_CLK_DELAY_MAX + 1) 115 116 /* IO_MUX_CFG bits */ 117 #define DP83867_IO_MUX_CFG_IO_IMPEDANCE_MASK 0x1f 118 #define DP83867_IO_MUX_CFG_IO_IMPEDANCE_MAX 0x0 119 #define DP83867_IO_MUX_CFG_IO_IMPEDANCE_MIN 0x1f 120 #define DP83867_IO_MUX_CFG_CLK_O_DISABLE BIT(6) 121 #define DP83867_IO_MUX_CFG_CLK_O_SEL_MASK (0x1f << 8) 122 #define DP83867_IO_MUX_CFG_CLK_O_SEL_SHIFT 8 123 124 /* PHY STS bits */ 125 #define DP83867_PHYSTS_1000 BIT(15) 126 #define DP83867_PHYSTS_100 BIT(14) 127 #define DP83867_PHYSTS_DUPLEX BIT(13) 128 #define DP83867_PHYSTS_LINK BIT(10) 129 130 /* CFG2 bits */ 131 #define DP83867_DOWNSHIFT_EN (BIT(8) | BIT(9)) 132 #define DP83867_DOWNSHIFT_ATTEMPT_MASK (BIT(10) | BIT(11)) 133 #define DP83867_DOWNSHIFT_1_COUNT_VAL 0 134 #define DP83867_DOWNSHIFT_2_COUNT_VAL 1 135 #define DP83867_DOWNSHIFT_4_COUNT_VAL 2 136 #define DP83867_DOWNSHIFT_8_COUNT_VAL 3 137 #define DP83867_DOWNSHIFT_1_COUNT 1 138 #define DP83867_DOWNSHIFT_2_COUNT 2 139 #define DP83867_DOWNSHIFT_4_COUNT 4 140 #define DP83867_DOWNSHIFT_8_COUNT 8 141 #define DP83867_SGMII_AUTONEG_EN BIT(7) 142 143 /* CFG3 bits */ 144 #define DP83867_CFG3_INT_OE BIT(7) 145 #define DP83867_CFG3_ROBUST_AUTO_MDIX BIT(9) 146 147 /* CFG4 bits */ 148 #define DP83867_CFG4_PORT_MIRROR_EN BIT(0) 149 150 /* FLD_THR_CFG */ 151 #define DP83867_FLD_THR_CFG_ENERGY_LOST_THR_MASK 0x7 152 153 enum { 154 DP83867_PORT_MIRROING_KEEP, 155 DP83867_PORT_MIRROING_EN, 156 DP83867_PORT_MIRROING_DIS, 157 }; 158 159 struct dp83867_private { 160 u32 rx_id_delay; 161 u32 tx_id_delay; 162 u32 tx_fifo_depth; 163 u32 rx_fifo_depth; 164 int io_impedance; 165 int port_mirroring; 166 bool rxctrl_strap_quirk; 167 bool set_clk_output; 168 u32 clk_output_sel; 169 bool sgmii_ref_clk_en; 170 }; 171 172 static int dp83867_ack_interrupt(struct phy_device *phydev) 173 { 174 int err = phy_read(phydev, MII_DP83867_ISR); 175 176 if (err < 0) 177 return err; 178 179 return 0; 180 } 181 182 static int dp83867_set_wol(struct phy_device *phydev, 183 struct ethtool_wolinfo *wol) 184 { 185 struct net_device *ndev = phydev->attached_dev; 186 u16 val_rxcfg, val_micr; 187 const u8 *mac; 188 189 val_rxcfg = phy_read_mmd(phydev, DP83867_DEVADDR, DP83867_RXFCFG); 190 val_micr = phy_read(phydev, MII_DP83867_MICR); 191 192 if (wol->wolopts & (WAKE_MAGIC | WAKE_MAGICSECURE | WAKE_UCAST | 193 WAKE_BCAST)) { 194 val_rxcfg |= DP83867_WOL_ENH_MAC; 195 val_micr |= MII_DP83867_MICR_WOL_INT_EN; 196 197 if (wol->wolopts & WAKE_MAGIC) { 198 mac = (const u8 *)ndev->dev_addr; 199 200 if (!is_valid_ether_addr(mac)) 201 return -EINVAL; 202 203 phy_write_mmd(phydev, DP83867_DEVADDR, DP83867_RXFPMD1, 204 (mac[1] << 8 | mac[0])); 205 phy_write_mmd(phydev, DP83867_DEVADDR, DP83867_RXFPMD2, 206 (mac[3] << 8 | mac[2])); 207 phy_write_mmd(phydev, DP83867_DEVADDR, DP83867_RXFPMD3, 208 (mac[5] << 8 | mac[4])); 209 210 val_rxcfg |= DP83867_WOL_MAGIC_EN; 211 } else { 212 val_rxcfg &= ~DP83867_WOL_MAGIC_EN; 213 } 214 215 if (wol->wolopts & WAKE_MAGICSECURE) { 216 phy_write_mmd(phydev, DP83867_DEVADDR, DP83867_RXFSOP1, 217 (wol->sopass[1] << 8) | wol->sopass[0]); 218 phy_write_mmd(phydev, DP83867_DEVADDR, DP83867_RXFSOP2, 219 (wol->sopass[3] << 8) | wol->sopass[2]); 220 phy_write_mmd(phydev, DP83867_DEVADDR, DP83867_RXFSOP3, 221 (wol->sopass[5] << 8) | wol->sopass[4]); 222 223 val_rxcfg |= DP83867_WOL_SEC_EN; 224 } else { 225 val_rxcfg &= ~DP83867_WOL_SEC_EN; 226 } 227 228 if (wol->wolopts & WAKE_UCAST) 229 val_rxcfg |= DP83867_WOL_UCAST_EN; 230 else 231 val_rxcfg &= ~DP83867_WOL_UCAST_EN; 232 233 if (wol->wolopts & WAKE_BCAST) 234 val_rxcfg |= DP83867_WOL_BCAST_EN; 235 else 236 val_rxcfg &= ~DP83867_WOL_BCAST_EN; 237 } else { 238 val_rxcfg &= ~DP83867_WOL_ENH_MAC; 239 val_micr &= ~MII_DP83867_MICR_WOL_INT_EN; 240 } 241 242 phy_write_mmd(phydev, DP83867_DEVADDR, DP83867_RXFCFG, val_rxcfg); 243 phy_write(phydev, MII_DP83867_MICR, val_micr); 244 245 return 0; 246 } 247 248 static void dp83867_get_wol(struct phy_device *phydev, 249 struct ethtool_wolinfo *wol) 250 { 251 u16 value, sopass_val; 252 253 wol->supported = (WAKE_UCAST | WAKE_BCAST | WAKE_MAGIC | 254 WAKE_MAGICSECURE); 255 wol->wolopts = 0; 256 257 value = phy_read_mmd(phydev, DP83867_DEVADDR, DP83867_RXFCFG); 258 259 if (value & DP83867_WOL_UCAST_EN) 260 wol->wolopts |= WAKE_UCAST; 261 262 if (value & DP83867_WOL_BCAST_EN) 263 wol->wolopts |= WAKE_BCAST; 264 265 if (value & DP83867_WOL_MAGIC_EN) 266 wol->wolopts |= WAKE_MAGIC; 267 268 if (value & DP83867_WOL_SEC_EN) { 269 sopass_val = phy_read_mmd(phydev, DP83867_DEVADDR, 270 DP83867_RXFSOP1); 271 wol->sopass[0] = (sopass_val & 0xff); 272 wol->sopass[1] = (sopass_val >> 8); 273 274 sopass_val = phy_read_mmd(phydev, DP83867_DEVADDR, 275 DP83867_RXFSOP2); 276 wol->sopass[2] = (sopass_val & 0xff); 277 wol->sopass[3] = (sopass_val >> 8); 278 279 sopass_val = phy_read_mmd(phydev, DP83867_DEVADDR, 280 DP83867_RXFSOP3); 281 wol->sopass[4] = (sopass_val & 0xff); 282 wol->sopass[5] = (sopass_val >> 8); 283 284 wol->wolopts |= WAKE_MAGICSECURE; 285 } 286 287 if (!(value & DP83867_WOL_ENH_MAC)) 288 wol->wolopts = 0; 289 } 290 291 static int dp83867_config_intr(struct phy_device *phydev) 292 { 293 int micr_status, err; 294 295 if (phydev->interrupts == PHY_INTERRUPT_ENABLED) { 296 err = dp83867_ack_interrupt(phydev); 297 if (err) 298 return err; 299 300 micr_status = phy_read(phydev, MII_DP83867_MICR); 301 if (micr_status < 0) 302 return micr_status; 303 304 micr_status |= 305 (MII_DP83867_MICR_AN_ERR_INT_EN | 306 MII_DP83867_MICR_SPEED_CHNG_INT_EN | 307 MII_DP83867_MICR_AUTONEG_COMP_INT_EN | 308 MII_DP83867_MICR_LINK_STS_CHNG_INT_EN | 309 MII_DP83867_MICR_DUP_MODE_CHNG_INT_EN | 310 MII_DP83867_MICR_SLEEP_MODE_CHNG_INT_EN); 311 312 err = phy_write(phydev, MII_DP83867_MICR, micr_status); 313 } else { 314 micr_status = 0x0; 315 err = phy_write(phydev, MII_DP83867_MICR, micr_status); 316 if (err) 317 return err; 318 319 err = dp83867_ack_interrupt(phydev); 320 } 321 322 return err; 323 } 324 325 static irqreturn_t dp83867_handle_interrupt(struct phy_device *phydev) 326 { 327 int irq_status, irq_enabled; 328 329 irq_status = phy_read(phydev, MII_DP83867_ISR); 330 if (irq_status < 0) { 331 phy_error(phydev); 332 return IRQ_NONE; 333 } 334 335 irq_enabled = phy_read(phydev, MII_DP83867_MICR); 336 if (irq_enabled < 0) { 337 phy_error(phydev); 338 return IRQ_NONE; 339 } 340 341 if (!(irq_status & irq_enabled)) 342 return IRQ_NONE; 343 344 phy_trigger_machine(phydev); 345 346 return IRQ_HANDLED; 347 } 348 349 static int dp83867_read_status(struct phy_device *phydev) 350 { 351 int status = phy_read(phydev, MII_DP83867_PHYSTS); 352 int ret; 353 354 ret = genphy_read_status(phydev); 355 if (ret) 356 return ret; 357 358 if (status < 0) 359 return status; 360 361 if (status & DP83867_PHYSTS_DUPLEX) 362 phydev->duplex = DUPLEX_FULL; 363 else 364 phydev->duplex = DUPLEX_HALF; 365 366 if (status & DP83867_PHYSTS_1000) 367 phydev->speed = SPEED_1000; 368 else if (status & DP83867_PHYSTS_100) 369 phydev->speed = SPEED_100; 370 else 371 phydev->speed = SPEED_10; 372 373 return 0; 374 } 375 376 static int dp83867_get_downshift(struct phy_device *phydev, u8 *data) 377 { 378 int val, cnt, enable, count; 379 380 val = phy_read(phydev, DP83867_CFG2); 381 if (val < 0) 382 return val; 383 384 enable = FIELD_GET(DP83867_DOWNSHIFT_EN, val); 385 cnt = FIELD_GET(DP83867_DOWNSHIFT_ATTEMPT_MASK, val); 386 387 switch (cnt) { 388 case DP83867_DOWNSHIFT_1_COUNT_VAL: 389 count = DP83867_DOWNSHIFT_1_COUNT; 390 break; 391 case DP83867_DOWNSHIFT_2_COUNT_VAL: 392 count = DP83867_DOWNSHIFT_2_COUNT; 393 break; 394 case DP83867_DOWNSHIFT_4_COUNT_VAL: 395 count = DP83867_DOWNSHIFT_4_COUNT; 396 break; 397 case DP83867_DOWNSHIFT_8_COUNT_VAL: 398 count = DP83867_DOWNSHIFT_8_COUNT; 399 break; 400 default: 401 return -EINVAL; 402 } 403 404 *data = enable ? count : DOWNSHIFT_DEV_DISABLE; 405 406 return 0; 407 } 408 409 static int dp83867_set_downshift(struct phy_device *phydev, u8 cnt) 410 { 411 int val, count; 412 413 if (cnt > DP83867_DOWNSHIFT_8_COUNT) 414 return -E2BIG; 415 416 if (!cnt) 417 return phy_clear_bits(phydev, DP83867_CFG2, 418 DP83867_DOWNSHIFT_EN); 419 420 switch (cnt) { 421 case DP83867_DOWNSHIFT_1_COUNT: 422 count = DP83867_DOWNSHIFT_1_COUNT_VAL; 423 break; 424 case DP83867_DOWNSHIFT_2_COUNT: 425 count = DP83867_DOWNSHIFT_2_COUNT_VAL; 426 break; 427 case DP83867_DOWNSHIFT_4_COUNT: 428 count = DP83867_DOWNSHIFT_4_COUNT_VAL; 429 break; 430 case DP83867_DOWNSHIFT_8_COUNT: 431 count = DP83867_DOWNSHIFT_8_COUNT_VAL; 432 break; 433 default: 434 phydev_err(phydev, 435 "Downshift count must be 1, 2, 4 or 8\n"); 436 return -EINVAL; 437 } 438 439 val = DP83867_DOWNSHIFT_EN; 440 val |= FIELD_PREP(DP83867_DOWNSHIFT_ATTEMPT_MASK, count); 441 442 return phy_modify(phydev, DP83867_CFG2, 443 DP83867_DOWNSHIFT_EN | DP83867_DOWNSHIFT_ATTEMPT_MASK, 444 val); 445 } 446 447 static int dp83867_get_tunable(struct phy_device *phydev, 448 struct ethtool_tunable *tuna, void *data) 449 { 450 switch (tuna->id) { 451 case ETHTOOL_PHY_DOWNSHIFT: 452 return dp83867_get_downshift(phydev, data); 453 default: 454 return -EOPNOTSUPP; 455 } 456 } 457 458 static int dp83867_set_tunable(struct phy_device *phydev, 459 struct ethtool_tunable *tuna, const void *data) 460 { 461 switch (tuna->id) { 462 case ETHTOOL_PHY_DOWNSHIFT: 463 return dp83867_set_downshift(phydev, *(const u8 *)data); 464 default: 465 return -EOPNOTSUPP; 466 } 467 } 468 469 static int dp83867_config_port_mirroring(struct phy_device *phydev) 470 { 471 struct dp83867_private *dp83867 = 472 (struct dp83867_private *)phydev->priv; 473 474 if (dp83867->port_mirroring == DP83867_PORT_MIRROING_EN) 475 phy_set_bits_mmd(phydev, DP83867_DEVADDR, DP83867_CFG4, 476 DP83867_CFG4_PORT_MIRROR_EN); 477 else 478 phy_clear_bits_mmd(phydev, DP83867_DEVADDR, DP83867_CFG4, 479 DP83867_CFG4_PORT_MIRROR_EN); 480 return 0; 481 } 482 483 static int dp83867_verify_rgmii_cfg(struct phy_device *phydev) 484 { 485 struct dp83867_private *dp83867 = phydev->priv; 486 487 /* Existing behavior was to use default pin strapping delay in rgmii 488 * mode, but rgmii should have meant no delay. Warn existing users. 489 */ 490 if (phydev->interface == PHY_INTERFACE_MODE_RGMII) { 491 const u16 val = phy_read_mmd(phydev, DP83867_DEVADDR, 492 DP83867_STRAP_STS2); 493 const u16 txskew = (val & DP83867_STRAP_STS2_CLK_SKEW_TX_MASK) >> 494 DP83867_STRAP_STS2_CLK_SKEW_TX_SHIFT; 495 const u16 rxskew = (val & DP83867_STRAP_STS2_CLK_SKEW_RX_MASK) >> 496 DP83867_STRAP_STS2_CLK_SKEW_RX_SHIFT; 497 498 if (txskew != DP83867_STRAP_STS2_CLK_SKEW_NONE || 499 rxskew != DP83867_STRAP_STS2_CLK_SKEW_NONE) 500 phydev_warn(phydev, 501 "PHY has delays via pin strapping, but phy-mode = 'rgmii'\n" 502 "Should be 'rgmii-id' to use internal delays txskew:%x rxskew:%x\n", 503 txskew, rxskew); 504 } 505 506 /* RX delay *must* be specified if internal delay of RX is used. */ 507 if ((phydev->interface == PHY_INTERFACE_MODE_RGMII_ID || 508 phydev->interface == PHY_INTERFACE_MODE_RGMII_RXID) && 509 dp83867->rx_id_delay == DP83867_RGMII_RX_CLK_DELAY_INV) { 510 phydev_err(phydev, "ti,rx-internal-delay must be specified\n"); 511 return -EINVAL; 512 } 513 514 /* TX delay *must* be specified if internal delay of TX is used. */ 515 if ((phydev->interface == PHY_INTERFACE_MODE_RGMII_ID || 516 phydev->interface == PHY_INTERFACE_MODE_RGMII_TXID) && 517 dp83867->tx_id_delay == DP83867_RGMII_TX_CLK_DELAY_INV) { 518 phydev_err(phydev, "ti,tx-internal-delay must be specified\n"); 519 return -EINVAL; 520 } 521 522 return 0; 523 } 524 525 #if IS_ENABLED(CONFIG_OF_MDIO) 526 static int dp83867_of_init_io_impedance(struct phy_device *phydev) 527 { 528 struct dp83867_private *dp83867 = phydev->priv; 529 struct device *dev = &phydev->mdio.dev; 530 struct device_node *of_node = dev->of_node; 531 struct nvmem_cell *cell; 532 u8 *buf, val; 533 int ret; 534 535 cell = of_nvmem_cell_get(of_node, "io_impedance_ctrl"); 536 if (IS_ERR(cell)) { 537 ret = PTR_ERR(cell); 538 if (ret != -ENOENT && ret != -EOPNOTSUPP) 539 return phydev_err_probe(phydev, ret, 540 "failed to get nvmem cell io_impedance_ctrl\n"); 541 542 /* If no nvmem cell, check for the boolean properties. */ 543 if (of_property_read_bool(of_node, "ti,max-output-impedance")) 544 dp83867->io_impedance = DP83867_IO_MUX_CFG_IO_IMPEDANCE_MAX; 545 else if (of_property_read_bool(of_node, "ti,min-output-impedance")) 546 dp83867->io_impedance = DP83867_IO_MUX_CFG_IO_IMPEDANCE_MIN; 547 else 548 dp83867->io_impedance = -1; /* leave at default */ 549 550 return 0; 551 } 552 553 buf = nvmem_cell_read(cell, NULL); 554 nvmem_cell_put(cell); 555 556 if (IS_ERR(buf)) 557 return PTR_ERR(buf); 558 559 val = *buf; 560 kfree(buf); 561 562 if ((val & DP83867_IO_MUX_CFG_IO_IMPEDANCE_MASK) != val) { 563 phydev_err(phydev, "nvmem cell 'io_impedance_ctrl' contents out of range\n"); 564 return -ERANGE; 565 } 566 dp83867->io_impedance = val; 567 568 return 0; 569 } 570 571 static int dp83867_of_init(struct phy_device *phydev) 572 { 573 struct dp83867_private *dp83867 = phydev->priv; 574 struct device *dev = &phydev->mdio.dev; 575 struct device_node *of_node = dev->of_node; 576 int ret; 577 578 if (!of_node) 579 return -ENODEV; 580 581 /* Optional configuration */ 582 ret = of_property_read_u32(of_node, "ti,clk-output-sel", 583 &dp83867->clk_output_sel); 584 /* If not set, keep default */ 585 if (!ret) { 586 dp83867->set_clk_output = true; 587 /* Valid values are 0 to DP83867_CLK_O_SEL_REF_CLK or 588 * DP83867_CLK_O_SEL_OFF. 589 */ 590 if (dp83867->clk_output_sel > DP83867_CLK_O_SEL_REF_CLK && 591 dp83867->clk_output_sel != DP83867_CLK_O_SEL_OFF) { 592 phydev_err(phydev, "ti,clk-output-sel value %u out of range\n", 593 dp83867->clk_output_sel); 594 return -EINVAL; 595 } 596 } 597 598 ret = dp83867_of_init_io_impedance(phydev); 599 if (ret) 600 return ret; 601 602 dp83867->rxctrl_strap_quirk = of_property_read_bool(of_node, 603 "ti,dp83867-rxctrl-strap-quirk"); 604 605 dp83867->sgmii_ref_clk_en = of_property_read_bool(of_node, 606 "ti,sgmii-ref-clock-output-enable"); 607 608 dp83867->rx_id_delay = DP83867_RGMII_RX_CLK_DELAY_INV; 609 ret = of_property_read_u32(of_node, "ti,rx-internal-delay", 610 &dp83867->rx_id_delay); 611 if (!ret && dp83867->rx_id_delay > DP83867_RGMII_RX_CLK_DELAY_MAX) { 612 phydev_err(phydev, 613 "ti,rx-internal-delay value of %u out of range\n", 614 dp83867->rx_id_delay); 615 return -EINVAL; 616 } 617 618 dp83867->tx_id_delay = DP83867_RGMII_TX_CLK_DELAY_INV; 619 ret = of_property_read_u32(of_node, "ti,tx-internal-delay", 620 &dp83867->tx_id_delay); 621 if (!ret && dp83867->tx_id_delay > DP83867_RGMII_TX_CLK_DELAY_MAX) { 622 phydev_err(phydev, 623 "ti,tx-internal-delay value of %u out of range\n", 624 dp83867->tx_id_delay); 625 return -EINVAL; 626 } 627 628 if (of_property_read_bool(of_node, "enet-phy-lane-swap")) 629 dp83867->port_mirroring = DP83867_PORT_MIRROING_EN; 630 631 if (of_property_read_bool(of_node, "enet-phy-lane-no-swap")) 632 dp83867->port_mirroring = DP83867_PORT_MIRROING_DIS; 633 634 ret = of_property_read_u32(of_node, "ti,fifo-depth", 635 &dp83867->tx_fifo_depth); 636 if (ret) { 637 ret = of_property_read_u32(of_node, "tx-fifo-depth", 638 &dp83867->tx_fifo_depth); 639 if (ret) 640 dp83867->tx_fifo_depth = 641 DP83867_PHYCR_FIFO_DEPTH_4_B_NIB; 642 } 643 644 if (dp83867->tx_fifo_depth > DP83867_PHYCR_FIFO_DEPTH_MAX) { 645 phydev_err(phydev, "tx-fifo-depth value %u out of range\n", 646 dp83867->tx_fifo_depth); 647 return -EINVAL; 648 } 649 650 ret = of_property_read_u32(of_node, "rx-fifo-depth", 651 &dp83867->rx_fifo_depth); 652 if (ret) 653 dp83867->rx_fifo_depth = DP83867_PHYCR_FIFO_DEPTH_4_B_NIB; 654 655 if (dp83867->rx_fifo_depth > DP83867_PHYCR_FIFO_DEPTH_MAX) { 656 phydev_err(phydev, "rx-fifo-depth value %u out of range\n", 657 dp83867->rx_fifo_depth); 658 return -EINVAL; 659 } 660 661 return 0; 662 } 663 #else 664 static int dp83867_of_init(struct phy_device *phydev) 665 { 666 struct dp83867_private *dp83867 = phydev->priv; 667 u16 delay; 668 669 /* For non-OF device, the RX and TX ID values are either strapped 670 * or take from default value. So, we init RX & TX ID values here 671 * so that the RGMIIDCTL is configured correctly later in 672 * dp83867_config_init(); 673 */ 674 delay = phy_read_mmd(phydev, DP83867_DEVADDR, DP83867_RGMIIDCTL); 675 dp83867->rx_id_delay = delay & DP83867_RGMII_RX_CLK_DELAY_MAX; 676 dp83867->tx_id_delay = (delay >> DP83867_RGMII_TX_CLK_DELAY_SHIFT) & 677 DP83867_RGMII_TX_CLK_DELAY_MAX; 678 679 /* Per datasheet, IO impedance is default to 50-ohm, so we set the 680 * same here or else the default '0' means highest IO impedance 681 * which is wrong. 682 */ 683 dp83867->io_impedance = DP83867_IO_MUX_CFG_IO_IMPEDANCE_MIN / 2; 684 685 /* For non-OF device, the RX and TX FIFO depths are taken from 686 * default value. So, we init RX & TX FIFO depths here 687 * so that it is configured correctly later in dp83867_config_init(); 688 */ 689 dp83867->tx_fifo_depth = DP83867_PHYCR_FIFO_DEPTH_4_B_NIB; 690 dp83867->rx_fifo_depth = DP83867_PHYCR_FIFO_DEPTH_4_B_NIB; 691 692 return 0; 693 } 694 #endif /* CONFIG_OF_MDIO */ 695 696 static int dp83867_probe(struct phy_device *phydev) 697 { 698 struct dp83867_private *dp83867; 699 700 dp83867 = devm_kzalloc(&phydev->mdio.dev, sizeof(*dp83867), 701 GFP_KERNEL); 702 if (!dp83867) 703 return -ENOMEM; 704 705 phydev->priv = dp83867; 706 707 return dp83867_of_init(phydev); 708 } 709 710 static int dp83867_config_init(struct phy_device *phydev) 711 { 712 struct dp83867_private *dp83867 = phydev->priv; 713 int ret, val, bs; 714 u16 delay; 715 716 /* Force speed optimization for the PHY even if it strapped */ 717 ret = phy_modify(phydev, DP83867_CFG2, DP83867_DOWNSHIFT_EN, 718 DP83867_DOWNSHIFT_EN); 719 if (ret) 720 return ret; 721 722 ret = dp83867_verify_rgmii_cfg(phydev); 723 if (ret) 724 return ret; 725 726 /* RX_DV/RX_CTRL strapped in mode 1 or mode 2 workaround */ 727 if (dp83867->rxctrl_strap_quirk) 728 phy_clear_bits_mmd(phydev, DP83867_DEVADDR, DP83867_CFG4, 729 BIT(7)); 730 731 bs = phy_read_mmd(phydev, DP83867_DEVADDR, DP83867_STRAP_STS2); 732 if (bs & DP83867_STRAP_STS2_STRAP_FLD) { 733 /* When using strap to enable FLD, the ENERGY_LOST_FLD_THR will 734 * be set to 0x2. This may causes the PHY link to be unstable - 735 * the default value 0x1 need to be restored. 736 */ 737 ret = phy_modify_mmd(phydev, DP83867_DEVADDR, 738 DP83867_FLD_THR_CFG, 739 DP83867_FLD_THR_CFG_ENERGY_LOST_THR_MASK, 740 0x1); 741 if (ret) 742 return ret; 743 } 744 745 if (phy_interface_is_rgmii(phydev) || 746 phydev->interface == PHY_INTERFACE_MODE_SGMII) { 747 val = phy_read(phydev, MII_DP83867_PHYCTRL); 748 if (val < 0) 749 return val; 750 751 val &= ~DP83867_PHYCR_TX_FIFO_DEPTH_MASK; 752 val |= (dp83867->tx_fifo_depth << 753 DP83867_PHYCR_TX_FIFO_DEPTH_SHIFT); 754 755 if (phydev->interface == PHY_INTERFACE_MODE_SGMII) { 756 val &= ~DP83867_PHYCR_RX_FIFO_DEPTH_MASK; 757 val |= (dp83867->rx_fifo_depth << 758 DP83867_PHYCR_RX_FIFO_DEPTH_SHIFT); 759 } 760 761 ret = phy_write(phydev, MII_DP83867_PHYCTRL, val); 762 if (ret) 763 return ret; 764 } 765 766 if (phy_interface_is_rgmii(phydev)) { 767 val = phy_read(phydev, MII_DP83867_PHYCTRL); 768 if (val < 0) 769 return val; 770 771 /* The code below checks if "port mirroring" N/A MODE4 has been 772 * enabled during power on bootstrap. 773 * 774 * Such N/A mode enabled by mistake can put PHY IC in some 775 * internal testing mode and disable RGMII transmission. 776 * 777 * In this particular case one needs to check STRAP_STS1 778 * register's bit 11 (marked as RESERVED). 779 */ 780 781 bs = phy_read_mmd(phydev, DP83867_DEVADDR, DP83867_STRAP_STS1); 782 if (bs & DP83867_STRAP_STS1_RESERVED) 783 val &= ~DP83867_PHYCR_RESERVED_MASK; 784 785 ret = phy_write(phydev, MII_DP83867_PHYCTRL, val); 786 if (ret) 787 return ret; 788 789 /* If rgmii mode with no internal delay is selected, we do NOT use 790 * aligned mode as one might expect. Instead we use the PHY's default 791 * based on pin strapping. And the "mode 0" default is to *use* 792 * internal delay with a value of 7 (2.00 ns). 793 * 794 * Set up RGMII delays 795 */ 796 val = phy_read_mmd(phydev, DP83867_DEVADDR, DP83867_RGMIICTL); 797 798 val &= ~(DP83867_RGMII_TX_CLK_DELAY_EN | DP83867_RGMII_RX_CLK_DELAY_EN); 799 if (phydev->interface == PHY_INTERFACE_MODE_RGMII_ID) 800 val |= (DP83867_RGMII_TX_CLK_DELAY_EN | DP83867_RGMII_RX_CLK_DELAY_EN); 801 802 if (phydev->interface == PHY_INTERFACE_MODE_RGMII_TXID) 803 val |= DP83867_RGMII_TX_CLK_DELAY_EN; 804 805 if (phydev->interface == PHY_INTERFACE_MODE_RGMII_RXID) 806 val |= DP83867_RGMII_RX_CLK_DELAY_EN; 807 808 phy_write_mmd(phydev, DP83867_DEVADDR, DP83867_RGMIICTL, val); 809 810 delay = 0; 811 if (dp83867->rx_id_delay != DP83867_RGMII_RX_CLK_DELAY_INV) 812 delay |= dp83867->rx_id_delay; 813 if (dp83867->tx_id_delay != DP83867_RGMII_TX_CLK_DELAY_INV) 814 delay |= dp83867->tx_id_delay << 815 DP83867_RGMII_TX_CLK_DELAY_SHIFT; 816 817 phy_write_mmd(phydev, DP83867_DEVADDR, DP83867_RGMIIDCTL, 818 delay); 819 } 820 821 /* If specified, set io impedance */ 822 if (dp83867->io_impedance >= 0) 823 phy_modify_mmd(phydev, DP83867_DEVADDR, DP83867_IO_MUX_CFG, 824 DP83867_IO_MUX_CFG_IO_IMPEDANCE_MASK, 825 dp83867->io_impedance); 826 827 if (phydev->interface == PHY_INTERFACE_MODE_SGMII) { 828 /* For support SPEED_10 in SGMII mode 829 * DP83867_10M_SGMII_RATE_ADAPT bit 830 * has to be cleared by software. That 831 * does not affect SPEED_100 and 832 * SPEED_1000. 833 */ 834 ret = phy_modify_mmd(phydev, DP83867_DEVADDR, 835 DP83867_10M_SGMII_CFG, 836 DP83867_10M_SGMII_RATE_ADAPT_MASK, 837 0); 838 if (ret) 839 return ret; 840 841 /* After reset SGMII Autoneg timer is set to 2us (bits 6 and 5 842 * are 01). That is not enough to finalize autoneg on some 843 * devices. Increase this timer duration to maximum 16ms. 844 */ 845 ret = phy_modify_mmd(phydev, DP83867_DEVADDR, 846 DP83867_CFG4, 847 DP83867_CFG4_SGMII_ANEG_MASK, 848 DP83867_CFG4_SGMII_ANEG_TIMER_16MS); 849 850 if (ret) 851 return ret; 852 853 val = phy_read_mmd(phydev, DP83867_DEVADDR, DP83867_SGMIICTL); 854 /* SGMII type is set to 4-wire mode by default. 855 * If we place appropriate property in dts (see above) 856 * switch on 6-wire mode. 857 */ 858 if (dp83867->sgmii_ref_clk_en) 859 val |= DP83867_SGMII_TYPE; 860 else 861 val &= ~DP83867_SGMII_TYPE; 862 phy_write_mmd(phydev, DP83867_DEVADDR, DP83867_SGMIICTL, val); 863 864 /* This is a SW workaround for link instability if RX_CTRL is 865 * not strapped to mode 3 or 4 in HW. This is required for SGMII 866 * in addition to clearing bit 7, handled above. 867 */ 868 if (dp83867->rxctrl_strap_quirk) 869 phy_set_bits_mmd(phydev, DP83867_DEVADDR, DP83867_CFG4, 870 BIT(8)); 871 } 872 873 val = phy_read(phydev, DP83867_CFG3); 874 /* Enable Interrupt output INT_OE in CFG3 register */ 875 if (phy_interrupt_is_valid(phydev)) 876 val |= DP83867_CFG3_INT_OE; 877 878 val |= DP83867_CFG3_ROBUST_AUTO_MDIX; 879 phy_write(phydev, DP83867_CFG3, val); 880 881 if (dp83867->port_mirroring != DP83867_PORT_MIRROING_KEEP) 882 dp83867_config_port_mirroring(phydev); 883 884 /* Clock output selection if muxing property is set */ 885 if (dp83867->set_clk_output) { 886 u16 mask = DP83867_IO_MUX_CFG_CLK_O_DISABLE; 887 888 if (dp83867->clk_output_sel == DP83867_CLK_O_SEL_OFF) { 889 val = DP83867_IO_MUX_CFG_CLK_O_DISABLE; 890 } else { 891 mask |= DP83867_IO_MUX_CFG_CLK_O_SEL_MASK; 892 val = dp83867->clk_output_sel << 893 DP83867_IO_MUX_CFG_CLK_O_SEL_SHIFT; 894 } 895 896 phy_modify_mmd(phydev, DP83867_DEVADDR, DP83867_IO_MUX_CFG, 897 mask, val); 898 } 899 900 return 0; 901 } 902 903 static int dp83867_phy_reset(struct phy_device *phydev) 904 { 905 int err; 906 907 err = phy_write(phydev, DP83867_CTRL, DP83867_SW_RESTART); 908 if (err < 0) 909 return err; 910 911 usleep_range(10, 20); 912 913 return phy_modify(phydev, MII_DP83867_PHYCTRL, 914 DP83867_PHYCR_FORCE_LINK_GOOD, 0); 915 } 916 917 static void dp83867_link_change_notify(struct phy_device *phydev) 918 { 919 /* There is a limitation in DP83867 PHY device where SGMII AN is 920 * only triggered once after the device is booted up. Even after the 921 * PHY TPI is down and up again, SGMII AN is not triggered and 922 * hence no new in-band message from PHY to MAC side SGMII. 923 * This could cause an issue during power up, when PHY is up prior 924 * to MAC. At this condition, once MAC side SGMII is up, MAC side 925 * SGMII wouldn`t receive new in-band message from TI PHY with 926 * correct link status, speed and duplex info. 927 * Thus, implemented a SW solution here to retrigger SGMII Auto-Neg 928 * whenever there is a link change. 929 */ 930 if (phydev->interface == PHY_INTERFACE_MODE_SGMII) { 931 int val = 0; 932 933 val = phy_clear_bits(phydev, DP83867_CFG2, 934 DP83867_SGMII_AUTONEG_EN); 935 if (val < 0) 936 return; 937 938 phy_set_bits(phydev, DP83867_CFG2, 939 DP83867_SGMII_AUTONEG_EN); 940 } 941 } 942 943 static int dp83867_loopback(struct phy_device *phydev, bool enable) 944 { 945 return phy_modify(phydev, MII_BMCR, BMCR_LOOPBACK, 946 enable ? BMCR_LOOPBACK : 0); 947 } 948 949 static struct phy_driver dp83867_driver[] = { 950 { 951 .phy_id = DP83867_PHY_ID, 952 .phy_id_mask = 0xfffffff0, 953 .name = "TI DP83867", 954 /* PHY_GBIT_FEATURES */ 955 956 .probe = dp83867_probe, 957 .config_init = dp83867_config_init, 958 .soft_reset = dp83867_phy_reset, 959 960 .read_status = dp83867_read_status, 961 .get_tunable = dp83867_get_tunable, 962 .set_tunable = dp83867_set_tunable, 963 964 .get_wol = dp83867_get_wol, 965 .set_wol = dp83867_set_wol, 966 967 /* IRQ related */ 968 .config_intr = dp83867_config_intr, 969 .handle_interrupt = dp83867_handle_interrupt, 970 971 .suspend = genphy_suspend, 972 .resume = genphy_resume, 973 974 .link_change_notify = dp83867_link_change_notify, 975 .set_loopback = dp83867_loopback, 976 }, 977 }; 978 module_phy_driver(dp83867_driver); 979 980 static struct mdio_device_id __maybe_unused dp83867_tbl[] = { 981 { DP83867_PHY_ID, 0xfffffff0 }, 982 { } 983 }; 984 985 MODULE_DEVICE_TABLE(mdio, dp83867_tbl); 986 987 MODULE_DESCRIPTION("Texas Instruments DP83867 PHY driver"); 988 MODULE_AUTHOR("Dan Murphy <dmurphy@ti.com"); 989 MODULE_LICENSE("GPL v2"); 990