drivers/net/phy/dp83822.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /* Driver for the Texas Instruments DP83822, DP83825 and DP83826 PHYs.
   3  *
   4  * Copyright (C) 2017 Texas Instruments Inc.
   5  */
   6
   7 #include <linux/ethtool.h>
   8 #include <linux/etherdevice.h>
   9 #include <linux/kernel.h>
  10 #include <linux/mii.h>
  11 #include <linux/module.h>
  12 #include <linux/of.h>
  13 #include <linux/phy.h>
  14 #include <linux/netdevice.h>
  15
  16 #define DP83822_PHY_ID          0x2000a240
  17 #define DP83825S_PHY_ID         0x2000a140
  18 #define DP83825I_PHY_ID         0x2000a150
  19 #define DP83825CM_PHY_ID        0x2000a160
  20 #define DP83825CS_PHY_ID        0x2000a170
  21 #define DP83826C_PHY_ID         0x2000a130
  22 #define DP83826NC_PHY_ID        0x2000a110
  23
  24 #define DP83822_DEVADDR         0x1f
  25
  26 #define MII_DP83822_PHYSCR      0x11
  27 #define MII_DP83822_MISR1       0x12
  28 #define MII_DP83822_MISR2       0x13
  29 #define MII_DP83822_RESET_CTRL  0x1f
  30
  31 #define DP83822_HW_RESET        BIT(15)
  32 #define DP83822_SW_RESET        BIT(14)
  33
  34 /* PHYSCR Register Fields */
  35 #define DP83822_PHYSCR_INT_OE           BIT(0) /* Interrupt Output Enable */
  36 #define DP83822_PHYSCR_INTEN            BIT(1) /* Interrupt Enable */
  37
  38 /* MISR1 bits */
  39 #define DP83822_RX_ERR_HF_INT_EN        BIT(0)
  40 #define DP83822_FALSE_CARRIER_HF_INT_EN BIT(1)
  41 #define DP83822_ANEG_COMPLETE_INT_EN    BIT(2)
  42 #define DP83822_DUP_MODE_CHANGE_INT_EN  BIT(3)
  43 #define DP83822_SPEED_CHANGED_INT_EN    BIT(4)
  44 #define DP83822_LINK_STAT_INT_EN        BIT(5)
  45 #define DP83822_ENERGY_DET_INT_EN       BIT(6)
  46 #define DP83822_LINK_QUAL_INT_EN        BIT(7)
  47
  48 /* MISR2 bits */
  49 #define DP83822_JABBER_DET_INT_EN       BIT(0)
  50 #define DP83822_WOL_PKT_INT_EN          BIT(1)
  51 #define DP83822_SLEEP_MODE_INT_EN       BIT(2)
  52 #define DP83822_MDI_XOVER_INT_EN        BIT(3)
  53 #define DP83822_LB_FIFO_INT_EN          BIT(4)
  54 #define DP83822_PAGE_RX_INT_EN          BIT(5)
  55 #define DP83822_ANEG_ERR_INT_EN         BIT(6)
  56 #define DP83822_EEE_ERROR_CHANGE_INT_EN BIT(7)
  57
  58 /* INT_STAT1 bits */
  59 #define DP83822_WOL_INT_EN      BIT(4)
  60 #define DP83822_WOL_INT_STAT    BIT(12)
  61
  62 #define MII_DP83822_RXSOP1      0x04a5
  63 #define MII_DP83822_RXSOP2      0x04a6
  64 #define MII_DP83822_RXSOP3      0x04a7
  65
  66 /* WoL Registers */
  67 #define MII_DP83822_WOL_CFG     0x04a0
  68 #define MII_DP83822_WOL_STAT    0x04a1
  69 #define MII_DP83822_WOL_DA1     0x04a2
  70 #define MII_DP83822_WOL_DA2     0x04a3
  71 #define MII_DP83822_WOL_DA3     0x04a4
  72
  73 /* WoL bits */
  74 #define DP83822_WOL_MAGIC_EN    BIT(0)
  75 #define DP83822_WOL_SECURE_ON   BIT(5)
  76 #define DP83822_WOL_EN          BIT(7)
  77 #define DP83822_WOL_INDICATION_SEL BIT(8)
  78 #define DP83822_WOL_CLR_INDICATION BIT(11)
  79
  80 static int dp83822_ack_interrupt(struct phy_device *phydev)
  81 {
  82         int err;
  83
  84         err = phy_read(phydev, MII_DP83822_MISR1);
  85         if (err < 0)
  86                 return err;
  87
  88         err = phy_read(phydev, MII_DP83822_MISR2);
  89         if (err < 0)
  90                 return err;
  91
  92         return 0;
  93 }
  94
  95 static int dp83822_set_wol(struct phy_device *phydev,
  96                            struct ethtool_wolinfo *wol)
  97 {
  98         struct net_device *ndev = phydev->attached_dev;
  99         u16 value;
 100         const u8 *mac;
 101
 102         if (wol->wolopts & (WAKE_MAGIC | WAKE_MAGICSECURE)) {
 103                 mac = (const u8 *)ndev->dev_addr;
 104
 105                 if (!is_valid_ether_addr(mac))
 106                         return -EINVAL;
 107
 108                 /* MAC addresses start with byte 5, but stored in mac[0].
 109                  * 822 PHYs store bytes 4|5, 2|3, 0|1
 110                  */
 111                 phy_write_mmd(phydev, DP83822_DEVADDR, MII_DP83822_WOL_DA1,
 112                               (mac[1] << 8) | mac[0]);
 113                 phy_write_mmd(phydev, DP83822_DEVADDR, MII_DP83822_WOL_DA2,
 114                               (mac[3] << 8) | mac[2]);
 115                 phy_write_mmd(phydev, DP83822_DEVADDR, MII_DP83822_WOL_DA3,
 116                               (mac[5] << 8) | mac[4]);
 117
 118                 value = phy_read_mmd(phydev, DP83822_DEVADDR,
 119                                      MII_DP83822_WOL_CFG);
 120                 if (wol->wolopts & WAKE_MAGIC)
 121                         value |= DP83822_WOL_MAGIC_EN;
 122                 else
 123                         value &= ~DP83822_WOL_MAGIC_EN;
 124
 125                 if (wol->wolopts & WAKE_MAGICSECURE) {
 126                         phy_write_mmd(phydev, DP83822_DEVADDR,
 127                                       MII_DP83822_RXSOP1,
 128                                       (wol->sopass[1] << 8) | wol->sopass[0]);
 129                         phy_write_mmd(phydev, DP83822_DEVADDR,
 130                                       MII_DP83822_RXSOP2,
 131                                       (wol->sopass[3] << 8) | wol->sopass[2]);
 132                         phy_write_mmd(phydev, DP83822_DEVADDR,
 133                                       MII_DP83822_RXSOP3,
 134                                       (wol->sopass[5] << 8) | wol->sopass[4]);
 135                         value |= DP83822_WOL_SECURE_ON;
 136                 } else {
 137                         value &= ~DP83822_WOL_SECURE_ON;
 138                 }
 139
 140                 /* Clear any pending WoL interrupt */
 141                 phy_read(phydev, MII_DP83822_MISR2);
 142
 143                 value |= DP83822_WOL_EN | DP83822_WOL_INDICATION_SEL |
 144                          DP83822_WOL_CLR_INDICATION;
 145
 146                 return phy_write_mmd(phydev, DP83822_DEVADDR,
 147                                      MII_DP83822_WOL_CFG, value);
 148         } else {
 149                 return phy_clear_bits_mmd(phydev, DP83822_DEVADDR,
 150                                           MII_DP83822_WOL_CFG, DP83822_WOL_EN);
 151         }
 152 }
 153
 154 static void dp83822_get_wol(struct phy_device *phydev,
 155                             struct ethtool_wolinfo *wol)
 156 {
 157         int value;
 158         u16 sopass_val;
 159
 160         wol->supported = (WAKE_MAGIC | WAKE_MAGICSECURE);
 161         wol->wolopts = 0;
 162
 163         value = phy_read_mmd(phydev, DP83822_DEVADDR, MII_DP83822_WOL_CFG);
 164
 165         if (value & DP83822_WOL_MAGIC_EN)
 166                 wol->wolopts |= WAKE_MAGIC;
 167
 168         if (value & DP83822_WOL_SECURE_ON) {
 169                 sopass_val = phy_read_mmd(phydev, DP83822_DEVADDR,
 170                                           MII_DP83822_RXSOP1);
 171                 wol->sopass[0] = (sopass_val & 0xff);
 172                 wol->sopass[1] = (sopass_val >> 8);
 173
 174                 sopass_val = phy_read_mmd(phydev, DP83822_DEVADDR,
 175                                           MII_DP83822_RXSOP2);
 176                 wol->sopass[2] = (sopass_val & 0xff);
 177                 wol->sopass[3] = (sopass_val >> 8);
 178
 179                 sopass_val = phy_read_mmd(phydev, DP83822_DEVADDR,
 180                                           MII_DP83822_RXSOP3);
 181                 wol->sopass[4] = (sopass_val & 0xff);
 182                 wol->sopass[5] = (sopass_val >> 8);
 183
 184                 wol->wolopts |= WAKE_MAGICSECURE;
 185         }
 186
 187         /* WoL is not enabled so set wolopts to 0 */
 188         if (!(value & DP83822_WOL_EN))
 189                 wol->wolopts = 0;
 190 }
 191
 192 static int dp83822_config_intr(struct phy_device *phydev)
 193 {
 194         int misr_status;
 195         int physcr_status;
 196         int err;
 197
 198         if (phydev->interrupts == PHY_INTERRUPT_ENABLED) {
 199                 misr_status = phy_read(phydev, MII_DP83822_MISR1);
 200                 if (misr_status < 0)
 201                         return misr_status;
 202
 203                 misr_status |= (DP83822_RX_ERR_HF_INT_EN |
 204                                 DP83822_FALSE_CARRIER_HF_INT_EN |
 205                                 DP83822_ANEG_COMPLETE_INT_EN |
 206                                 DP83822_DUP_MODE_CHANGE_INT_EN |
 207                                 DP83822_SPEED_CHANGED_INT_EN |
 208                                 DP83822_LINK_STAT_INT_EN |
 209                                 DP83822_ENERGY_DET_INT_EN |
 210                                 DP83822_LINK_QUAL_INT_EN);
 211
 212                 err = phy_write(phydev, MII_DP83822_MISR1, misr_status);
 213                 if (err < 0)
 214                         return err;
 215
 216                 misr_status = phy_read(phydev, MII_DP83822_MISR2);
 217                 if (misr_status < 0)
 218                         return misr_status;
 219
 220                 misr_status |= (DP83822_JABBER_DET_INT_EN |
 221                                 DP83822_WOL_PKT_INT_EN |
 222                                 DP83822_SLEEP_MODE_INT_EN |
 223                                 DP83822_MDI_XOVER_INT_EN |
 224                                 DP83822_LB_FIFO_INT_EN |
 225                                 DP83822_PAGE_RX_INT_EN |
 226                                 DP83822_ANEG_ERR_INT_EN |
 227                                 DP83822_EEE_ERROR_CHANGE_INT_EN);
 228
 229                 err = phy_write(phydev, MII_DP83822_MISR2, misr_status);
 230                 if (err < 0)
 231                         return err;
 232
 233                 physcr_status = phy_read(phydev, MII_DP83822_PHYSCR);
 234                 if (physcr_status < 0)
 235                         return physcr_status;
 236
 237                 physcr_status |= DP83822_PHYSCR_INT_OE | DP83822_PHYSCR_INTEN;
 238
 239         } else {
 240                 err = phy_write(phydev, MII_DP83822_MISR1, 0);
 241                 if (err < 0)
 242                         return err;
 243
 244                 err = phy_write(phydev, MII_DP83822_MISR1, 0);
 245                 if (err < 0)
 246                         return err;
 247
 248                 physcr_status = phy_read(phydev, MII_DP83822_PHYSCR);
 249                 if (physcr_status < 0)
 250                         return physcr_status;
 251
 252                 physcr_status &= ~DP83822_PHYSCR_INTEN;
 253         }
 254
 255         return phy_write(phydev, MII_DP83822_PHYSCR, physcr_status);
 256 }
 257
 258 static int dp83822_config_init(struct phy_device *phydev)
 259 {
 260         int value = DP83822_WOL_EN | DP83822_WOL_MAGIC_EN |
 261                     DP83822_WOL_SECURE_ON;
 262
 263         return phy_clear_bits_mmd(phydev, DP83822_DEVADDR,
 264                                   MII_DP83822_WOL_CFG, value);
 265 }
 266
 267 static int dp83822_phy_reset(struct phy_device *phydev)
 268 {
 269         int err;
 270
 271         err = phy_write(phydev, MII_DP83822_RESET_CTRL, DP83822_HW_RESET);
 272         if (err < 0)
 273                 return err;
 274
 275         dp83822_config_init(phydev);
 276
 277         return 0;
 278 }
 279
 280 static int dp83822_suspend(struct phy_device *phydev)
 281 {
 282         int value;
 283
 284         value = phy_read_mmd(phydev, DP83822_DEVADDR, MII_DP83822_WOL_CFG);
 285
 286         if (!(value & DP83822_WOL_EN))
 287                 genphy_suspend(phydev);
 288
 289         return 0;
 290 }
 291
 292 static int dp83822_resume(struct phy_device *phydev)
 293 {
 294         int value;
 295
 296         genphy_resume(phydev);
 297
 298         value = phy_read_mmd(phydev, DP83822_DEVADDR, MII_DP83822_WOL_CFG);
 299
 300         phy_write_mmd(phydev, DP83822_DEVADDR, MII_DP83822_WOL_CFG, value |
 301                       DP83822_WOL_CLR_INDICATION);
 302
 303         return 0;
 304 }
 305
 306 #define DP83822_PHY_DRIVER(_id, _name)                          \
 307         {                                                       \
 308                 PHY_ID_MATCH_MODEL(_id),                        \
 309                 .name           = (_name),                      \
 310                 /* PHY_BASIC_FEATURES */                        \
 311                 .soft_reset     = dp83822_phy_reset,            \
 312                 .config_init    = dp83822_config_init,          \
 313                 .get_wol = dp83822_get_wol,                     \
 314                 .set_wol = dp83822_set_wol,                     \
 315                 .ack_interrupt = dp83822_ack_interrupt,         \
 316                 .config_intr = dp83822_config_intr,             \
 317                 .suspend = dp83822_suspend,                     \
 318                 .resume = dp83822_resume,                       \
 319         }
 320
 321 static struct phy_driver dp83822_driver[] = {
 322         DP83822_PHY_DRIVER(DP83822_PHY_ID, "TI DP83822"),
 323         DP83822_PHY_DRIVER(DP83825I_PHY_ID, "TI DP83825I"),
 324         DP83822_PHY_DRIVER(DP83826C_PHY_ID, "TI DP83826C"),
 325         DP83822_PHY_DRIVER(DP83826NC_PHY_ID, "TI DP83826NC"),
 326         DP83822_PHY_DRIVER(DP83825S_PHY_ID, "TI DP83825S"),
 327         DP83822_PHY_DRIVER(DP83825CM_PHY_ID, "TI DP83825M"),
 328         DP83822_PHY_DRIVER(DP83825CS_PHY_ID, "TI DP83825CS"),
 329 };
 330 module_phy_driver(dp83822_driver);
 331
 332 static struct mdio_device_id __maybe_unused dp83822_tbl[] = {
 333         { DP83822_PHY_ID, 0xfffffff0 },
 334         { DP83825I_PHY_ID, 0xfffffff0 },
 335         { DP83826C_PHY_ID, 0xfffffff0 },
 336         { DP83826NC_PHY_ID, 0xfffffff0 },
 337         { DP83825S_PHY_ID, 0xfffffff0 },
 338         { DP83825CM_PHY_ID, 0xfffffff0 },
 339         { DP83825CS_PHY_ID, 0xfffffff0 },
 340         { },
 341 };
 342 MODULE_DEVICE_TABLE(mdio, dp83822_tbl);
 343
 344 MODULE_DESCRIPTION("Texas Instruments DP83822 PHY driver");
 345 MODULE_AUTHOR("Dan Murphy <dmurphy@ti.com");
 346 MODULE_LICENSE("GPL v2");