drivers/net/phy/dp83867.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * TI PHY drivers
   4  *
   5  */
   6 #include <common.h>
   7 #include <phy.h>
   8 #include <linux/compat.h>
   9 #include <malloc.h>
  10
  11 #include <dm.h>
  12 #include <dt-bindings/net/ti-dp83867.h>
  13
  14
  15 /* TI DP83867 */
  16 #define DP83867_DEVADDR         0x1f
  17
  18 #define MII_DP83867_PHYCTRL     0x10
  19 #define MII_DP83867_MICR        0x12
  20 #define MII_DP83867_CFG2        0x14
  21 #define MII_DP83867_BISCR       0x16
  22 #define DP83867_CTRL            0x1f
  23
  24 /* Extended Registers */
  25 #define DP83867_CFG4            0x0031
  26 #define DP83867_RGMIICTL        0x0032
  27 #define DP83867_STRAP_STS1      0x006E
  28 #define DP83867_STRAP_STS2      0x006f
  29 #define DP83867_RGMIIDCTL       0x0086
  30 #define DP83867_IO_MUX_CFG      0x0170
  31
  32 #define DP83867_SW_RESET        BIT(15)
  33 #define DP83867_SW_RESTART      BIT(14)
  34
  35 /* MICR Interrupt bits */
  36 #define MII_DP83867_MICR_AN_ERR_INT_EN          BIT(15)
  37 #define MII_DP83867_MICR_SPEED_CHNG_INT_EN      BIT(14)
  38 #define MII_DP83867_MICR_DUP_MODE_CHNG_INT_EN   BIT(13)
  39 #define MII_DP83867_MICR_PAGE_RXD_INT_EN        BIT(12)
  40 #define MII_DP83867_MICR_AUTONEG_COMP_INT_EN    BIT(11)
  41 #define MII_DP83867_MICR_LINK_STS_CHNG_INT_EN   BIT(10)
  42 #define MII_DP83867_MICR_FALSE_CARRIER_INT_EN   BIT(8)
  43 #define MII_DP83867_MICR_SLEEP_MODE_CHNG_INT_EN BIT(4)
  44 #define MII_DP83867_MICR_WOL_INT_EN             BIT(3)
  45 #define MII_DP83867_MICR_XGMII_ERR_INT_EN       BIT(2)
  46 #define MII_DP83867_MICR_POL_CHNG_INT_EN        BIT(1)
  47 #define MII_DP83867_MICR_JABBER_INT_EN          BIT(0)
  48
  49 /* RGMIICTL bits */
  50 #define DP83867_RGMII_TX_CLK_DELAY_EN           BIT(1)
  51 #define DP83867_RGMII_RX_CLK_DELAY_EN           BIT(0)
  52
  53 /* STRAP_STS1 bits */
  54 #define DP83867_STRAP_STS1_RESERVED             BIT(11)
  55
  56 /* STRAP_STS2 bits */
  57 #define DP83867_STRAP_STS2_CLK_SKEW_TX_MASK     GENMASK(6, 4)
  58 #define DP83867_STRAP_STS2_CLK_SKEW_TX_SHIFT    4
  59 #define DP83867_STRAP_STS2_CLK_SKEW_RX_MASK     GENMASK(2, 0)
  60 #define DP83867_STRAP_STS2_CLK_SKEW_RX_SHIFT    0
  61 #define DP83867_STRAP_STS2_CLK_SKEW_NONE        BIT(2)
  62
  63 /* PHY CTRL bits */
  64 #define DP83867_PHYCR_FIFO_DEPTH_SHIFT          14
  65 #define DP83867_PHYCR_RESERVED_MASK     BIT(11)
  66 #define DP83867_MDI_CROSSOVER           5
  67 #define DP83867_MDI_CROSSOVER_AUTO      2
  68 #define DP83867_MDI_CROSSOVER_MDIX      2
  69 #define DP83867_PHYCTRL_SGMIIEN                 0x0800
  70 #define DP83867_PHYCTRL_RXFIFO_SHIFT    12
  71 #define DP83867_PHYCTRL_TXFIFO_SHIFT    14
  72
  73 /* RGMIIDCTL bits */
  74 #define DP83867_RGMII_TX_CLK_DELAY_MAX          0xf
  75 #define DP83867_RGMII_TX_CLK_DELAY_SHIFT        4
  76 #define DP83867_RGMII_RX_CLK_DELAY_MAX          0xf
  77
  78 /* CFG2 bits */
  79 #define MII_DP83867_CFG2_SPEEDOPT_10EN          0x0040
  80 #define MII_DP83867_CFG2_SGMII_AUTONEGEN        0x0080
  81 #define MII_DP83867_CFG2_SPEEDOPT_ENH           0x0100
  82 #define MII_DP83867_CFG2_SPEEDOPT_CNT           0x0800
  83 #define MII_DP83867_CFG2_SPEEDOPT_INTLOW        0x2000
  84 #define MII_DP83867_CFG2_MASK                   0x003F
  85
  86 /* User setting - can be taken from DTS */
  87 #define DEFAULT_FIFO_DEPTH      DP83867_PHYCR_FIFO_DEPTH_4_B_NIB
  88
  89 /* IO_MUX_CFG bits */
  90 #define DP83867_IO_MUX_CFG_IO_IMPEDANCE_CTRL    0x1f
  91
  92 #define DP83867_IO_MUX_CFG_IO_IMPEDANCE_MAX     0x0
  93 #define DP83867_IO_MUX_CFG_IO_IMPEDANCE_MIN     0x1f
  94 #define DP83867_IO_MUX_CFG_CLK_O_DISABLE        BIT(6)
  95 #define DP83867_IO_MUX_CFG_CLK_O_SEL_SHIFT      8
  96 #define DP83867_IO_MUX_CFG_CLK_O_SEL_MASK       \
  97                 GENMASK(0x1f, DP83867_IO_MUX_CFG_CLK_O_SEL_SHIFT)
  98
  99 /* CFG4 bits */
 100 #define DP83867_CFG4_PORT_MIRROR_EN             BIT(0)
 101
 102 enum {
 103         DP83867_PORT_MIRRORING_KEEP,
 104         DP83867_PORT_MIRRORING_EN,
 105         DP83867_PORT_MIRRORING_DIS,
 106 };
 107
 108 struct dp83867_private {
 109         u32 rx_id_delay;
 110         u32 tx_id_delay;
 111         int fifo_depth;
 112         int io_impedance;
 113         bool rxctrl_strap_quirk;
 114         int port_mirroring;
 115         bool set_clk_output;
 116         unsigned int clk_output_sel;
 117 };
 118
 119 static int dp83867_config_port_mirroring(struct phy_device *phydev)
 120 {
 121         struct dp83867_private *dp83867 =
 122                 (struct dp83867_private *)phydev->priv;
 123         u16 val;
 124
 125         val = phy_read_mmd(phydev, DP83867_DEVADDR, DP83867_CFG4);
 126
 127         if (dp83867->port_mirroring == DP83867_PORT_MIRRORING_EN)
 128                 val |= DP83867_CFG4_PORT_MIRROR_EN;
 129         else
 130                 val &= ~DP83867_CFG4_PORT_MIRROR_EN;
 131
 132         phy_write_mmd(phydev, DP83867_DEVADDR, DP83867_CFG4, val);
 133
 134         return 0;
 135 }
 136
 137 #if defined(CONFIG_DM_ETH)
 138 /**
 139  * dp83867_data_init - Convenience function for setting PHY specific data
 140  *
 141  * @phydev: the phy_device struct
 142  */
 143 static int dp83867_of_init(struct phy_device *phydev)
 144 {
 145         struct dp83867_private *dp83867 = phydev->priv;
 146         ofnode node;
 147         int ret;
 148
 149         node = phy_get_ofnode(phydev);
 150         if (!ofnode_valid(node))
 151                 return -EINVAL;
 152
 153         /* Optional configuration */
 154         ret = ofnode_read_u32(node, "ti,clk-output-sel",
 155                               &dp83867->clk_output_sel);
 156         /* If not set, keep default */
 157         if (!ret) {
 158                 dp83867->set_clk_output = true;
 159                 /* Valid values are 0 to DP83867_CLK_O_SEL_REF_CLK or
 160                  * DP83867_CLK_O_SEL_OFF.
 161                  */
 162                 if (dp83867->clk_output_sel > DP83867_CLK_O_SEL_REF_CLK &&
 163                     dp83867->clk_output_sel != DP83867_CLK_O_SEL_OFF) {
 164                         pr_debug("ti,clk-output-sel value %u out of range\n",
 165                                  dp83867->clk_output_sel);
 166                         return -EINVAL;
 167                 }
 168         }
 169
 170         if (ofnode_read_bool(node, "ti,max-output-impedance"))
 171                 dp83867->io_impedance = DP83867_IO_MUX_CFG_IO_IMPEDANCE_MAX;
 172         else if (ofnode_read_bool(node, "ti,min-output-impedance"))
 173                 dp83867->io_impedance = DP83867_IO_MUX_CFG_IO_IMPEDANCE_MIN;
 174         else
 175                 dp83867->io_impedance = -EINVAL;
 176
 177         if (ofnode_read_bool(node, "ti,dp83867-rxctrl-strap-quirk"))
 178                 dp83867->rxctrl_strap_quirk = true;
 179
 180         /* Existing behavior was to use default pin strapping delay in rgmii
 181          * mode, but rgmii should have meant no delay.  Warn existing users.
 182          */
 183         if (phydev->interface == PHY_INTERFACE_MODE_RGMII) {
 184                 u16 val = phy_read_mmd(phydev, DP83867_DEVADDR,
 185                                        DP83867_STRAP_STS2);
 186                 u16 txskew = (val & DP83867_STRAP_STS2_CLK_SKEW_TX_MASK) >>
 187                              DP83867_STRAP_STS2_CLK_SKEW_TX_SHIFT;
 188                 u16 rxskew = (val & DP83867_STRAP_STS2_CLK_SKEW_RX_MASK) >>
 189                              DP83867_STRAP_STS2_CLK_SKEW_RX_SHIFT;
 190
 191                 if (txskew != DP83867_STRAP_STS2_CLK_SKEW_NONE ||
 192                     rxskew != DP83867_STRAP_STS2_CLK_SKEW_NONE)
 193                         pr_warn("PHY has delays via pin strapping, but phy-mode = 'rgmii'\n"
 194                                 "Should be 'rgmii-id' to use internal delays\n");
 195         }
 196
 197         /* RX delay *must* be specified if internal delay of RX is used. */
 198         if (phydev->interface == PHY_INTERFACE_MODE_RGMII_ID ||
 199             phydev->interface == PHY_INTERFACE_MODE_RGMII_RXID) {
 200                 ret = ofnode_read_u32(node, "ti,rx-internal-delay",
 201                                       &dp83867->rx_id_delay);
 202                 if (ret) {
 203                         pr_debug("ti,rx-internal-delay must be specified\n");
 204                         return ret;
 205                 }
 206                 if (dp83867->rx_id_delay > DP83867_RGMII_RX_CLK_DELAY_MAX) {
 207                         pr_debug("ti,rx-internal-delay value of %u out of range\n",
 208                                  dp83867->rx_id_delay);
 209                         return -EINVAL;
 210                 }
 211         }
 212
 213         /* TX delay *must* be specified if internal delay of RX is used. */
 214         if (phydev->interface == PHY_INTERFACE_MODE_RGMII_ID ||
 215             phydev->interface == PHY_INTERFACE_MODE_RGMII_TXID) {
 216                 ret = ofnode_read_u32(node, "ti,tx-internal-delay",
 217                                       &dp83867->tx_id_delay);
 218                 if (ret) {
 219                         debug("ti,tx-internal-delay must be specified\n");
 220                         return ret;
 221                 }
 222                 if (dp83867->tx_id_delay > DP83867_RGMII_TX_CLK_DELAY_MAX) {
 223                         pr_debug("ti,tx-internal-delay value of %u out of range\n",
 224                                  dp83867->tx_id_delay);
 225                         return -EINVAL;
 226                 }
 227         }
 228
 229         dp83867->fifo_depth = ofnode_read_u32_default(node, "ti,fifo-depth",
 230                                                       DEFAULT_FIFO_DEPTH);
 231         if (ofnode_read_bool(node, "enet-phy-lane-swap"))
 232                 dp83867->port_mirroring = DP83867_PORT_MIRRORING_EN;
 233
 234         if (ofnode_read_bool(node, "enet-phy-lane-no-swap"))
 235                 dp83867->port_mirroring = DP83867_PORT_MIRRORING_DIS;
 236
 237         return 0;
 238 }
 239 #else
 240 static int dp83867_of_init(struct phy_device *phydev)
 241 {
 242         struct dp83867_private *dp83867 = phydev->priv;
 243
 244         dp83867->rx_id_delay = DP83867_RGMIIDCTL_2_25_NS;
 245         dp83867->tx_id_delay = DP83867_RGMIIDCTL_2_75_NS;
 246         dp83867->fifo_depth = DEFAULT_FIFO_DEPTH;
 247         dp83867->io_impedance = -EINVAL;
 248
 249         return 0;
 250 }
 251 #endif
 252
 253 static int dp83867_config(struct phy_device *phydev)
 254 {
 255         struct dp83867_private *dp83867;
 256         unsigned int val, delay, cfg2;
 257         int ret, bs;
 258
 259         dp83867 = (struct dp83867_private *)phydev->priv;
 260
 261         ret = dp83867_of_init(phydev);
 262         if (ret)
 263                 return ret;
 264
 265         /* Restart the PHY.  */
 266         val = phy_read(phydev, MDIO_DEVAD_NONE, DP83867_CTRL);
 267         phy_write(phydev, MDIO_DEVAD_NONE, DP83867_CTRL,
 268                   val | DP83867_SW_RESTART);
 269
 270         /* Mode 1 or 2 workaround */
 271         if (dp83867->rxctrl_strap_quirk) {
 272                 val = phy_read_mmd(phydev, DP83867_DEVADDR,
 273                                    DP83867_CFG4);
 274                 val &= ~BIT(7);
 275                 phy_write_mmd(phydev, DP83867_DEVADDR,
 276                               DP83867_CFG4, val);
 277         }
 278
 279         if (phy_interface_is_rgmii(phydev)) {
 280                 ret = phy_write(phydev, MDIO_DEVAD_NONE, MII_DP83867_PHYCTRL,
 281                         (DP83867_MDI_CROSSOVER_AUTO << DP83867_MDI_CROSSOVER) |
 282                         (dp83867->fifo_depth << DP83867_PHYCR_FIFO_DEPTH_SHIFT));
 283                 if (ret)
 284                         goto err_out;
 285
 286                 /* The code below checks if "port mirroring" N/A MODE4 has been
 287                  * enabled during power on bootstrap.
 288                  *
 289                  * Such N/A mode enabled by mistake can put PHY IC in some
 290                  * internal testing mode and disable RGMII transmission.
 291                  *
 292                  * In this particular case one needs to check STRAP_STS1
 293                  * register's bit 11 (marked as RESERVED).
 294                  */
 295
 296                 bs = phy_read_mmd(phydev, DP83867_DEVADDR,
 297                                   DP83867_STRAP_STS1);
 298                 val = phy_read(phydev, MDIO_DEVAD_NONE, MII_DP83867_PHYCTRL);
 299                 if (bs & DP83867_STRAP_STS1_RESERVED) {
 300                         val &= ~DP83867_PHYCR_RESERVED_MASK;
 301                         phy_write(phydev, MDIO_DEVAD_NONE, MII_DP83867_PHYCTRL,
 302                                   val);
 303                 }
 304
 305         } else if (phy_interface_is_sgmii(phydev)) {
 306                 phy_write(phydev, MDIO_DEVAD_NONE, MII_BMCR,
 307                           (BMCR_ANENABLE | BMCR_FULLDPLX | BMCR_SPEED1000));
 308
 309                 cfg2 = phy_read(phydev, phydev->addr, MII_DP83867_CFG2);
 310                 cfg2 &= MII_DP83867_CFG2_MASK;
 311                 cfg2 |= (MII_DP83867_CFG2_SPEEDOPT_10EN |
 312                          MII_DP83867_CFG2_SGMII_AUTONEGEN |
 313                          MII_DP83867_CFG2_SPEEDOPT_ENH |
 314                          MII_DP83867_CFG2_SPEEDOPT_CNT |
 315                          MII_DP83867_CFG2_SPEEDOPT_INTLOW);
 316                 phy_write(phydev, MDIO_DEVAD_NONE, MII_DP83867_CFG2, cfg2);
 317
 318                 phy_write_mmd(phydev, DP83867_DEVADDR,
 319                               DP83867_RGMIICTL, 0x0);
 320
 321                 phy_write(phydev, MDIO_DEVAD_NONE, MII_DP83867_PHYCTRL,
 322                           DP83867_PHYCTRL_SGMIIEN |
 323                           (DP83867_MDI_CROSSOVER_MDIX <<
 324                           DP83867_MDI_CROSSOVER) |
 325                           (dp83867->fifo_depth << DP83867_PHYCTRL_RXFIFO_SHIFT) |
 326                           (dp83867->fifo_depth << DP83867_PHYCTRL_TXFIFO_SHIFT));
 327                 phy_write(phydev, MDIO_DEVAD_NONE, MII_DP83867_BISCR, 0x0);
 328         }
 329
 330         if (phy_interface_is_rgmii(phydev)) {
 331                 val = phy_read_mmd(phydev, DP83867_DEVADDR,
 332                                    DP83867_RGMIICTL);
 333
 334                 val &= ~(DP83867_RGMII_TX_CLK_DELAY_EN |
 335                          DP83867_RGMII_RX_CLK_DELAY_EN);
 336                 if (phydev->interface == PHY_INTERFACE_MODE_RGMII_ID)
 337                         val |= (DP83867_RGMII_TX_CLK_DELAY_EN |
 338                                 DP83867_RGMII_RX_CLK_DELAY_EN);
 339
 340                 if (phydev->interface == PHY_INTERFACE_MODE_RGMII_TXID)
 341                         val |= DP83867_RGMII_TX_CLK_DELAY_EN;
 342
 343                 if (phydev->interface == PHY_INTERFACE_MODE_RGMII_RXID)
 344                         val |= DP83867_RGMII_RX_CLK_DELAY_EN;
 345
 346                 phy_write_mmd(phydev, DP83867_DEVADDR,
 347                               DP83867_RGMIICTL, val);
 348
 349                 delay = (dp83867->rx_id_delay |
 350                          (dp83867->tx_id_delay << DP83867_RGMII_TX_CLK_DELAY_SHIFT));
 351
 352                 phy_write_mmd(phydev, DP83867_DEVADDR,
 353                               DP83867_RGMIIDCTL, delay);
 354         }
 355
 356         if (dp83867->io_impedance >= 0) {
 357                 val = phy_read_mmd(phydev,
 358                                    DP83867_DEVADDR,
 359                                    DP83867_IO_MUX_CFG);
 360                 val &= ~DP83867_IO_MUX_CFG_IO_IMPEDANCE_CTRL;
 361                 val |= dp83867->io_impedance &
 362                        DP83867_IO_MUX_CFG_IO_IMPEDANCE_CTRL;
 363                 phy_write_mmd(phydev, DP83867_DEVADDR,
 364                               DP83867_IO_MUX_CFG, val);
 365         }
 366
 367         if (dp83867->port_mirroring != DP83867_PORT_MIRRORING_KEEP)
 368                 dp83867_config_port_mirroring(phydev);
 369
 370         /* Clock output selection if muxing property is set */
 371         if (dp83867->set_clk_output) {
 372                 val = phy_read_mmd(phydev, DP83867_DEVADDR,
 373                                    DP83867_IO_MUX_CFG);
 374
 375                 if (dp83867->clk_output_sel == DP83867_CLK_O_SEL_OFF) {
 376                         val |= DP83867_IO_MUX_CFG_CLK_O_DISABLE;
 377                 } else {
 378                         val &= ~(DP83867_IO_MUX_CFG_CLK_O_SEL_MASK |
 379                                  DP83867_IO_MUX_CFG_CLK_O_DISABLE);
 380                         val |= dp83867->clk_output_sel <<
 381                                DP83867_IO_MUX_CFG_CLK_O_SEL_SHIFT;
 382                 }
 383                 phy_write_mmd(phydev, DP83867_DEVADDR,
 384                               DP83867_IO_MUX_CFG, val);
 385         }
 386
 387         genphy_config_aneg(phydev);
 388         return 0;
 389
 390 err_out:
 391         return ret;
 392 }
 393
 394 static int dp83867_probe(struct phy_device *phydev)
 395 {
 396         struct dp83867_private *dp83867;
 397
 398         dp83867 = kzalloc(sizeof(*dp83867), GFP_KERNEL);
 399         if (!dp83867)
 400                 return -ENOMEM;
 401
 402         phydev->priv = dp83867;
 403         return 0;
 404 }
 405
 406 static struct phy_driver DP83867_driver = {
 407         .name = "TI DP83867",
 408         .uid = 0x2000a231,
 409         .mask = 0xfffffff0,
 410         .features = PHY_GBIT_FEATURES,
 411         .probe = dp83867_probe,
 412         .config = &dp83867_config,
 413         .startup = &genphy_startup,
 414         .shutdown = &genphy_shutdown,
 415 };
 416
 417 int phy_ti_init(void)
 418 {
 419         phy_register(&DP83867_driver);
 420         return 0;
 421 }