drivers/net/phy/dp83tc811.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Driver for the Texas Instruments DP83TC811 PHY
   4  *
   5  * Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com/
   6  *
   7  */
   8
   9 #include <linux/ethtool.h>
  10 #include <linux/etherdevice.h>
  11 #include <linux/kernel.h>
  12 #include <linux/mii.h>
  13 #include <linux/module.h>
  14 #include <linux/of.h>
  15 #include <linux/phy.h>
  16 #include <linux/netdevice.h>
  17
  18 #define DP83TC811_PHY_ID        0x2000a253
  19 #define DP83811_DEVADDR         0x1f
  20
  21 #define MII_DP83811_SGMII_CTRL  0x09
  22 #define MII_DP83811_INT_STAT1   0x12
  23 #define MII_DP83811_INT_STAT2   0x13
  24 #define MII_DP83811_INT_STAT3   0x18
  25 #define MII_DP83811_RESET_CTRL  0x1f
  26
  27 #define DP83811_HW_RESET        BIT(15)
  28 #define DP83811_SW_RESET        BIT(14)
  29
  30 /* INT_STAT1 bits */
  31 #define DP83811_RX_ERR_HF_INT_EN        BIT(0)
  32 #define DP83811_MS_TRAINING_INT_EN      BIT(1)
  33 #define DP83811_ANEG_COMPLETE_INT_EN    BIT(2)
  34 #define DP83811_ESD_EVENT_INT_EN        BIT(3)
  35 #define DP83811_WOL_INT_EN              BIT(4)
  36 #define DP83811_LINK_STAT_INT_EN        BIT(5)
  37 #define DP83811_ENERGY_DET_INT_EN       BIT(6)
  38 #define DP83811_LINK_QUAL_INT_EN        BIT(7)
  39
  40 /* INT_STAT2 bits */
  41 #define DP83811_JABBER_DET_INT_EN       BIT(0)
  42 #define DP83811_POLARITY_INT_EN         BIT(1)
  43 #define DP83811_SLEEP_MODE_INT_EN       BIT(2)
  44 #define DP83811_OVERTEMP_INT_EN         BIT(3)
  45 #define DP83811_OVERVOLTAGE_INT_EN      BIT(6)
  46 #define DP83811_UNDERVOLTAGE_INT_EN     BIT(7)
  47
  48 /* INT_STAT3 bits */
  49 #define DP83811_LPS_INT_EN      BIT(0)
  50 #define DP83811_NO_FRAME_INT_EN BIT(3)
  51 #define DP83811_POR_DONE_INT_EN BIT(4)
  52
  53 #define MII_DP83811_RXSOP1      0x04a5
  54 #define MII_DP83811_RXSOP2      0x04a6
  55 #define MII_DP83811_RXSOP3      0x04a7
  56
  57 /* WoL Registers */
  58 #define MII_DP83811_WOL_CFG     0x04a0
  59 #define MII_DP83811_WOL_STAT    0x04a1
  60 #define MII_DP83811_WOL_DA1     0x04a2
  61 #define MII_DP83811_WOL_DA2     0x04a3
  62 #define MII_DP83811_WOL_DA3     0x04a4
  63
  64 /* WoL bits */
  65 #define DP83811_WOL_MAGIC_EN    BIT(0)
  66 #define DP83811_WOL_SECURE_ON   BIT(5)
  67 #define DP83811_WOL_EN          BIT(7)
  68 #define DP83811_WOL_INDICATION_SEL BIT(8)
  69 #define DP83811_WOL_CLR_INDICATION BIT(11)
  70
  71 /* SGMII CTRL bits */
  72 #define DP83811_TDR_AUTO                BIT(8)
  73 #define DP83811_SGMII_EN                BIT(12)
  74 #define DP83811_SGMII_AUTO_NEG_EN       BIT(13)
  75 #define DP83811_SGMII_TX_ERR_DIS        BIT(14)
  76 #define DP83811_SGMII_SOFT_RESET        BIT(15)
  77
  78 static int dp83811_ack_interrupt(struct phy_device *phydev)
  79 {
  80         int err;
  81
  82         err = phy_read(phydev, MII_DP83811_INT_STAT1);
  83         if (err < 0)
  84                 return err;
  85
  86         err = phy_read(phydev, MII_DP83811_INT_STAT2);
  87         if (err < 0)
  88                 return err;
  89
  90         err = phy_read(phydev, MII_DP83811_INT_STAT3);
  91         if (err < 0)
  92                 return err;
  93
  94         return 0;
  95 }
  96
  97 static int dp83811_set_wol(struct phy_device *phydev,
  98                            struct ethtool_wolinfo *wol)
  99 {
 100         struct net_device *ndev = phydev->attached_dev;
 101         const u8 *mac;
 102         u16 value;
 103
 104         if (wol->wolopts & (WAKE_MAGIC | WAKE_MAGICSECURE)) {
 105                 mac = (const u8 *)ndev->dev_addr;
 106
 107                 if (!is_valid_ether_addr(mac))
 108                         return -EINVAL;
 109
 110                 /* MAC addresses start with byte 5, but stored in mac[0].
 111                  * 811 PHYs store bytes 4|5, 2|3, 0|1
 112                  */
 113                 phy_write_mmd(phydev, DP83811_DEVADDR, MII_DP83811_WOL_DA1,
 114                               (mac[1] << 8) | mac[0]);
 115                 phy_write_mmd(phydev, DP83811_DEVADDR, MII_DP83811_WOL_DA2,
 116                               (mac[3] << 8) | mac[2]);
 117                 phy_write_mmd(phydev, DP83811_DEVADDR, MII_DP83811_WOL_DA3,
 118                               (mac[5] << 8) | mac[4]);
 119
 120                 value = phy_read_mmd(phydev, DP83811_DEVADDR,
 121                                      MII_DP83811_WOL_CFG);
 122                 if (wol->wolopts & WAKE_MAGIC)
 123                         value |= DP83811_WOL_MAGIC_EN;
 124                 else
 125                         value &= ~DP83811_WOL_MAGIC_EN;
 126
 127                 if (wol->wolopts & WAKE_MAGICSECURE) {
 128                         phy_write_mmd(phydev, DP83811_DEVADDR,
 129                                       MII_DP83811_RXSOP1,
 130                                       (wol->sopass[1] << 8) | wol->sopass[0]);
 131                         phy_write_mmd(phydev, DP83811_DEVADDR,
 132                                       MII_DP83811_RXSOP2,
 133                                       (wol->sopass[3] << 8) | wol->sopass[2]);
 134                         phy_write_mmd(phydev, DP83811_DEVADDR,
 135                                       MII_DP83811_RXSOP3,
 136                                       (wol->sopass[5] << 8) | wol->sopass[4]);
 137                         value |= DP83811_WOL_SECURE_ON;
 138                 } else {
 139                         value &= ~DP83811_WOL_SECURE_ON;
 140                 }
 141
 142                 /* Clear any pending WoL interrupt */
 143                 phy_read(phydev, MII_DP83811_INT_STAT1);
 144
 145                 value |= DP83811_WOL_EN | DP83811_WOL_INDICATION_SEL |
 146                          DP83811_WOL_CLR_INDICATION;
 147
 148                 return phy_write_mmd(phydev, DP83811_DEVADDR,
 149                                      MII_DP83811_WOL_CFG, value);
 150         } else {
 151                 return phy_clear_bits_mmd(phydev, DP83811_DEVADDR,
 152                                           MII_DP83811_WOL_CFG, DP83811_WOL_EN);
 153         }
 154
 155 }
 156
 157 static void dp83811_get_wol(struct phy_device *phydev,
 158                             struct ethtool_wolinfo *wol)
 159 {
 160         u16 sopass_val;
 161         int value;
 162
 163         wol->supported = (WAKE_MAGIC | WAKE_MAGICSECURE);
 164         wol->wolopts = 0;
 165
 166         value = phy_read_mmd(phydev, DP83811_DEVADDR, MII_DP83811_WOL_CFG);
 167
 168         if (value & DP83811_WOL_MAGIC_EN)
 169                 wol->wolopts |= WAKE_MAGIC;
 170
 171         if (value & DP83811_WOL_SECURE_ON) {
 172                 sopass_val = phy_read_mmd(phydev, DP83811_DEVADDR,
 173                                           MII_DP83811_RXSOP1);
 174                 wol->sopass[0] = (sopass_val & 0xff);
 175                 wol->sopass[1] = (sopass_val >> 8);
 176
 177                 sopass_val = phy_read_mmd(phydev, DP83811_DEVADDR,
 178                                           MII_DP83811_RXSOP2);
 179                 wol->sopass[2] = (sopass_val & 0xff);
 180                 wol->sopass[3] = (sopass_val >> 8);
 181
 182                 sopass_val = phy_read_mmd(phydev, DP83811_DEVADDR,
 183                                           MII_DP83811_RXSOP3);
 184                 wol->sopass[4] = (sopass_val & 0xff);
 185                 wol->sopass[5] = (sopass_val >> 8);
 186
 187                 wol->wolopts |= WAKE_MAGICSECURE;
 188         }
 189
 190         /* WoL is not enabled so set wolopts to 0 */
 191         if (!(value & DP83811_WOL_EN))
 192                 wol->wolopts = 0;
 193 }
 194
 195 static int dp83811_config_intr(struct phy_device *phydev)
 196 {
 197         int misr_status, err;
 198
 199         if (phydev->interrupts == PHY_INTERRUPT_ENABLED) {
 200                 err = dp83811_ack_interrupt(phydev);
 201                 if (err)
 202                         return err;
 203
 204                 misr_status = phy_read(phydev, MII_DP83811_INT_STAT1);
 205                 if (misr_status < 0)
 206                         return misr_status;
 207
 208                 misr_status |= (DP83811_RX_ERR_HF_INT_EN |
 209                                 DP83811_MS_TRAINING_INT_EN |
 210                                 DP83811_ANEG_COMPLETE_INT_EN |
 211                                 DP83811_ESD_EVENT_INT_EN |
 212                                 DP83811_WOL_INT_EN |
 213                                 DP83811_LINK_STAT_INT_EN |
 214                                 DP83811_ENERGY_DET_INT_EN |
 215                                 DP83811_LINK_QUAL_INT_EN);
 216
 217                 err = phy_write(phydev, MII_DP83811_INT_STAT1, misr_status);
 218                 if (err < 0)
 219                         return err;
 220
 221                 misr_status = phy_read(phydev, MII_DP83811_INT_STAT2);
 222                 if (misr_status < 0)
 223                         return misr_status;
 224
 225                 misr_status |= (DP83811_JABBER_DET_INT_EN |
 226                                 DP83811_POLARITY_INT_EN |
 227                                 DP83811_SLEEP_MODE_INT_EN |
 228                                 DP83811_OVERTEMP_INT_EN |
 229                                 DP83811_OVERVOLTAGE_INT_EN |
 230                                 DP83811_UNDERVOLTAGE_INT_EN);
 231
 232                 err = phy_write(phydev, MII_DP83811_INT_STAT2, misr_status);
 233                 if (err < 0)
 234                         return err;
 235
 236                 misr_status = phy_read(phydev, MII_DP83811_INT_STAT3);
 237                 if (misr_status < 0)
 238                         return misr_status;
 239
 240                 misr_status |= (DP83811_LPS_INT_EN |
 241                                 DP83811_NO_FRAME_INT_EN |
 242                                 DP83811_POR_DONE_INT_EN);
 243
 244                 err = phy_write(phydev, MII_DP83811_INT_STAT3, misr_status);
 245
 246         } else {
 247                 err = phy_write(phydev, MII_DP83811_INT_STAT1, 0);
 248                 if (err < 0)
 249                         return err;
 250
 251                 err = phy_write(phydev, MII_DP83811_INT_STAT2, 0);
 252                 if (err < 0)
 253                         return err;
 254
 255                 err = phy_write(phydev, MII_DP83811_INT_STAT3, 0);
 256                 if (err < 0)
 257                         return err;
 258
 259                 err = dp83811_ack_interrupt(phydev);
 260         }
 261
 262         return err;
 263 }
 264
 265 static irqreturn_t dp83811_handle_interrupt(struct phy_device *phydev)
 266 {
 267         int irq_status;
 268
 269         /* The INT_STAT registers 1, 2 and 3 are holding the interrupt status
 270          * in the upper half (15:8), while the lower half (7:0) is used for
 271          * controlling the interrupt enable state of those individual interrupt
 272          * sources. To determine the possible interrupt sources, just read the
 273          * INT_STAT* register and use it directly to know which interrupts have
 274          * been enabled previously or not.
 275          */
 276         irq_status = phy_read(phydev, MII_DP83811_INT_STAT1);
 277         if (irq_status < 0) {
 278                 phy_error(phydev);
 279                 return IRQ_NONE;
 280         }
 281         if (irq_status & ((irq_status & GENMASK(7, 0)) << 8))
 282                 goto trigger_machine;
 283
 284         irq_status = phy_read(phydev, MII_DP83811_INT_STAT2);
 285         if (irq_status < 0) {
 286                 phy_error(phydev);
 287                 return IRQ_NONE;
 288         }
 289         if (irq_status & ((irq_status & GENMASK(7, 0)) << 8))
 290                 goto trigger_machine;
 291
 292         irq_status = phy_read(phydev, MII_DP83811_INT_STAT3);
 293         if (irq_status < 0) {
 294                 phy_error(phydev);
 295                 return IRQ_NONE;
 296         }
 297         if (irq_status & ((irq_status & GENMASK(7, 0)) << 8))
 298                 goto trigger_machine;
 299
 300         return IRQ_NONE;
 301
 302 trigger_machine:
 303         phy_trigger_machine(phydev);
 304
 305         return IRQ_HANDLED;
 306 }
 307
 308 static int dp83811_config_aneg(struct phy_device *phydev)
 309 {
 310         int value, err;
 311
 312         if (phydev->interface == PHY_INTERFACE_MODE_SGMII) {
 313                 value = phy_read(phydev, MII_DP83811_SGMII_CTRL);
 314                 if (phydev->autoneg == AUTONEG_ENABLE) {
 315                         err = phy_write(phydev, MII_DP83811_SGMII_CTRL,
 316                                         (DP83811_SGMII_AUTO_NEG_EN | value));
 317                         if (err < 0)
 318                                 return err;
 319                 } else {
 320                         err = phy_write(phydev, MII_DP83811_SGMII_CTRL,
 321                                         (~DP83811_SGMII_AUTO_NEG_EN & value));
 322                         if (err < 0)
 323                                 return err;
 324                 }
 325         }
 326
 327         return genphy_config_aneg(phydev);
 328 }
 329
 330 static int dp83811_config_init(struct phy_device *phydev)
 331 {
 332         int value, err;
 333
 334         value = phy_read(phydev, MII_DP83811_SGMII_CTRL);
 335         if (phydev->interface == PHY_INTERFACE_MODE_SGMII) {
 336                 err = phy_write(phydev, MII_DP83811_SGMII_CTRL,
 337                                         (DP83811_SGMII_EN | value));
 338         } else {
 339                 err = phy_write(phydev, MII_DP83811_SGMII_CTRL,
 340                                 (~DP83811_SGMII_EN & value));
 341         }
 342
 343         if (err < 0)
 344
 345                 return err;
 346
 347         value = DP83811_WOL_MAGIC_EN | DP83811_WOL_SECURE_ON | DP83811_WOL_EN;
 348
 349         return phy_clear_bits_mmd(phydev, DP83811_DEVADDR, MII_DP83811_WOL_CFG,
 350                                   value);
 351 }
 352
 353 static int dp83811_phy_reset(struct phy_device *phydev)
 354 {
 355         int err;
 356
 357         err = phy_write(phydev, MII_DP83811_RESET_CTRL, DP83811_HW_RESET);
 358         if (err < 0)
 359                 return err;
 360
 361         return 0;
 362 }
 363
 364 static int dp83811_suspend(struct phy_device *phydev)
 365 {
 366         int value;
 367
 368         value = phy_read_mmd(phydev, DP83811_DEVADDR, MII_DP83811_WOL_CFG);
 369
 370         if (!(value & DP83811_WOL_EN))
 371                 genphy_suspend(phydev);
 372
 373         return 0;
 374 }
 375
 376 static int dp83811_resume(struct phy_device *phydev)
 377 {
 378         genphy_resume(phydev);
 379
 380         phy_set_bits_mmd(phydev, DP83811_DEVADDR, MII_DP83811_WOL_CFG,
 381                          DP83811_WOL_CLR_INDICATION);
 382
 383         return 0;
 384 }
 385
 386 static struct phy_driver dp83811_driver[] = {
 387         {
 388                 .phy_id = DP83TC811_PHY_ID,
 389                 .phy_id_mask = 0xfffffff0,
 390                 .name = "TI DP83TC811",
 391                 /* PHY_BASIC_FEATURES */
 392                 .config_init = dp83811_config_init,
 393                 .config_aneg = dp83811_config_aneg,
 394                 .soft_reset = dp83811_phy_reset,
 395                 .get_wol = dp83811_get_wol,
 396                 .set_wol = dp83811_set_wol,
 397                 .config_intr = dp83811_config_intr,
 398                 .handle_interrupt = dp83811_handle_interrupt,
 399                 .suspend = dp83811_suspend,
 400                 .resume = dp83811_resume,
 401          },
 402 };
 403 module_phy_driver(dp83811_driver);
 404
 405 static struct mdio_device_id __maybe_unused dp83811_tbl[] = {
 406         { DP83TC811_PHY_ID, 0xfffffff0 },
 407         { },
 408 };
 409 MODULE_DEVICE_TABLE(mdio, dp83811_tbl);
 410
 411 MODULE_DESCRIPTION("Texas Instruments DP83TC811 PHY driver");
 412 MODULE_AUTHOR("Dan Murphy <dmurphy@ti.com");
 413 MODULE_LICENSE("GPL");