drivers/net/phy/micrel.c

   1 /*
   2  * drivers/net/phy/micrel.c
   3  *
   4  * Driver for Micrel PHYs
   5  *
   6  * Author: David J. Choi
   7  *
   8  * Copyright (c) 2010-2013 Micrel, Inc.
   9  * Copyright (c) 2014 Johan Hovold <johan@kernel.org>
  10  *
  11  * This program is free software; you can redistribute  it and/or modify it
  12  * under  the terms of  the GNU General  Public License as published by the
  13  * Free Software Foundation;  either version 2 of the  License, or (at your
  14  * option) any later version.
  15  *
  16  * Support : Micrel Phys:
  17  *              Giga phys: ksz9021, ksz9031, ksz9131
  18  *              100/10 Phys : ksz8001, ksz8721, ksz8737, ksz8041
  19  *                         ksz8021, ksz8031, ksz8051,
  20  *                         ksz8081, ksz8091,
  21  *                         ksz8061,
  22  *              Switch : ksz8873, ksz886x
  23  *                       ksz9477
  24  */
  25
  26 #include <linux/kernel.h>
  27 #include <linux/module.h>
  28 #include <linux/phy.h>
  29 #include <linux/micrel_phy.h>
  30 #include <linux/of.h>
  31 #include <linux/clk.h>
  32
  33 /* Operation Mode Strap Override */
  34 #define MII_KSZPHY_OMSO                         0x16
  35 #define KSZPHY_OMSO_B_CAST_OFF                  BIT(9)
  36 #define KSZPHY_OMSO_NAND_TREE_ON                BIT(5)
  37 #define KSZPHY_OMSO_RMII_OVERRIDE               BIT(1)
  38 #define KSZPHY_OMSO_MII_OVERRIDE                BIT(0)
  39
  40 /* general Interrupt control/status reg in vendor specific block. */
  41 #define MII_KSZPHY_INTCS                        0x1B
  42 #define KSZPHY_INTCS_JABBER                     BIT(15)
  43 #define KSZPHY_INTCS_RECEIVE_ERR                BIT(14)
  44 #define KSZPHY_INTCS_PAGE_RECEIVE               BIT(13)
  45 #define KSZPHY_INTCS_PARELLEL                   BIT(12)
  46 #define KSZPHY_INTCS_LINK_PARTNER_ACK           BIT(11)
  47 #define KSZPHY_INTCS_LINK_DOWN                  BIT(10)
  48 #define KSZPHY_INTCS_REMOTE_FAULT               BIT(9)
  49 #define KSZPHY_INTCS_LINK_UP                    BIT(8)
  50 #define KSZPHY_INTCS_ALL                        (KSZPHY_INTCS_LINK_UP |\
  51                                                 KSZPHY_INTCS_LINK_DOWN)
  52
  53 /* PHY Control 1 */
  54 #define MII_KSZPHY_CTRL_1                       0x1e
  55
  56 /* PHY Control 2 / PHY Control (if no PHY Control 1) */
  57 #define MII_KSZPHY_CTRL_2                       0x1f
  58 #define MII_KSZPHY_CTRL                         MII_KSZPHY_CTRL_2
  59 /* bitmap of PHY register to set interrupt mode */
  60 #define KSZPHY_CTRL_INT_ACTIVE_HIGH             BIT(9)
  61 #define KSZPHY_RMII_REF_CLK_SEL                 BIT(7)
  62
  63 /* Write/read to/from extended registers */
  64 #define MII_KSZPHY_EXTREG                       0x0b
  65 #define KSZPHY_EXTREG_WRITE                     0x8000
  66
  67 #define MII_KSZPHY_EXTREG_WRITE                 0x0c
  68 #define MII_KSZPHY_EXTREG_READ                  0x0d
  69
  70 /* Extended registers */
  71 #define MII_KSZPHY_CLK_CONTROL_PAD_SKEW         0x104
  72 #define MII_KSZPHY_RX_DATA_PAD_SKEW             0x105
  73 #define MII_KSZPHY_TX_DATA_PAD_SKEW             0x106
  74
  75 #define PS_TO_REG                               200
  76
  77 struct kszphy_hw_stat {
  78         const char *string;
  79         u8 reg;
  80         u8 bits;
  81 };
  82
  83 static struct kszphy_hw_stat kszphy_hw_stats[] = {
  84         { "phy_receive_errors", 21, 16},
  85         { "phy_idle_errors", 10, 8 },
  86 };
  87
  88 struct kszphy_type {
  89         u32 led_mode_reg;
  90         u16 interrupt_level_mask;
  91         bool has_broadcast_disable;
  92         bool has_nand_tree_disable;
  93         bool has_rmii_ref_clk_sel;
  94 };
  95
  96 struct kszphy_priv {
  97         const struct kszphy_type *type;
  98         int led_mode;
  99         bool rmii_ref_clk_sel;
 100         bool rmii_ref_clk_sel_val;
 101         u64 stats[ARRAY_SIZE(kszphy_hw_stats)];
 102 };
 103
 104 static const struct kszphy_type ksz8021_type = {
 105         .led_mode_reg           = MII_KSZPHY_CTRL_2,
 106         .has_broadcast_disable  = true,
 107         .has_nand_tree_disable  = true,
 108         .has_rmii_ref_clk_sel   = true,
 109 };
 110
 111 static const struct kszphy_type ksz8041_type = {
 112         .led_mode_reg           = MII_KSZPHY_CTRL_1,
 113 };
 114
 115 static const struct kszphy_type ksz8051_type = {
 116         .led_mode_reg           = MII_KSZPHY_CTRL_2,
 117         .has_nand_tree_disable  = true,
 118 };
 119
 120 static const struct kszphy_type ksz8081_type = {
 121         .led_mode_reg           = MII_KSZPHY_CTRL_2,
 122         .has_broadcast_disable  = true,
 123         .has_nand_tree_disable  = true,
 124         .has_rmii_ref_clk_sel   = true,
 125 };
 126
 127 static const struct kszphy_type ks8737_type = {
 128         .interrupt_level_mask   = BIT(14),
 129 };
 130
 131 static const struct kszphy_type ksz9021_type = {
 132         .interrupt_level_mask   = BIT(14),
 133 };
 134
 135 static int kszphy_extended_write(struct phy_device *phydev,
 136                                 u32 regnum, u16 val)
 137 {
 138         phy_write(phydev, MII_KSZPHY_EXTREG, KSZPHY_EXTREG_WRITE | regnum);
 139         return phy_write(phydev, MII_KSZPHY_EXTREG_WRITE, val);
 140 }
 141
 142 static int kszphy_extended_read(struct phy_device *phydev,
 143                                 u32 regnum)
 144 {
 145         phy_write(phydev, MII_KSZPHY_EXTREG, regnum);
 146         return phy_read(phydev, MII_KSZPHY_EXTREG_READ);
 147 }
 148
 149 static int kszphy_ack_interrupt(struct phy_device *phydev)
 150 {
 151         /* bit[7..0] int status, which is a read and clear register. */
 152         int rc;
 153
 154         rc = phy_read(phydev, MII_KSZPHY_INTCS);
 155
 156         return (rc < 0) ? rc : 0;
 157 }
 158
 159 static int kszphy_config_intr(struct phy_device *phydev)
 160 {
 161         const struct kszphy_type *type = phydev->drv->driver_data;
 162         int temp;
 163         u16 mask;
 164
 165         if (type && type->interrupt_level_mask)
 166                 mask = type->interrupt_level_mask;
 167         else
 168                 mask = KSZPHY_CTRL_INT_ACTIVE_HIGH;
 169
 170         /* set the interrupt pin active low */
 171         temp = phy_read(phydev, MII_KSZPHY_CTRL);
 172         if (temp < 0)
 173                 return temp;
 174         temp &= ~mask;
 175         phy_write(phydev, MII_KSZPHY_CTRL, temp);
 176
 177         /* enable / disable interrupts */
 178         if (phydev->interrupts == PHY_INTERRUPT_ENABLED)
 179                 temp = KSZPHY_INTCS_ALL;
 180         else
 181                 temp = 0;
 182
 183         return phy_write(phydev, MII_KSZPHY_INTCS, temp);
 184 }
 185
 186 static int kszphy_rmii_clk_sel(struct phy_device *phydev, bool val)
 187 {
 188         int ctrl;
 189
 190         ctrl = phy_read(phydev, MII_KSZPHY_CTRL);
 191         if (ctrl < 0)
 192                 return ctrl;
 193
 194         if (val)
 195                 ctrl |= KSZPHY_RMII_REF_CLK_SEL;
 196         else
 197                 ctrl &= ~KSZPHY_RMII_REF_CLK_SEL;
 198
 199         return phy_write(phydev, MII_KSZPHY_CTRL, ctrl);
 200 }
 201
 202 static int kszphy_setup_led(struct phy_device *phydev, u32 reg, int val)
 203 {
 204         int rc, temp, shift;
 205
 206         switch (reg) {
 207         case MII_KSZPHY_CTRL_1:
 208                 shift = 14;
 209                 break;
 210         case MII_KSZPHY_CTRL_2:
 211                 shift = 4;
 212                 break;
 213         default:
 214                 return -EINVAL;
 215         }
 216
 217         temp = phy_read(phydev, reg);
 218         if (temp < 0) {
 219                 rc = temp;
 220                 goto out;
 221         }
 222
 223         temp &= ~(3 << shift);
 224         temp |= val << shift;
 225         rc = phy_write(phydev, reg, temp);
 226 out:
 227         if (rc < 0)
 228                 phydev_err(phydev, "failed to set led mode\n");
 229
 230         return rc;
 231 }
 232
 233 /* Disable PHY address 0 as the broadcast address, so that it can be used as a
 234  * unique (non-broadcast) address on a shared bus.
 235  */
 236 static int kszphy_broadcast_disable(struct phy_device *phydev)
 237 {
 238         int ret;
 239
 240         ret = phy_read(phydev, MII_KSZPHY_OMSO);
 241         if (ret < 0)
 242                 goto out;
 243
 244         ret = phy_write(phydev, MII_KSZPHY_OMSO, ret | KSZPHY_OMSO_B_CAST_OFF);
 245 out:
 246         if (ret)
 247                 phydev_err(phydev, "failed to disable broadcast address\n");
 248
 249         return ret;
 250 }
 251
 252 static int kszphy_nand_tree_disable(struct phy_device *phydev)
 253 {
 254         int ret;
 255
 256         ret = phy_read(phydev, MII_KSZPHY_OMSO);
 257         if (ret < 0)
 258                 goto out;
 259
 260         if (!(ret & KSZPHY_OMSO_NAND_TREE_ON))
 261                 return 0;
 262
 263         ret = phy_write(phydev, MII_KSZPHY_OMSO,
 264                         ret & ~KSZPHY_OMSO_NAND_TREE_ON);
 265 out:
 266         if (ret)
 267                 phydev_err(phydev, "failed to disable NAND tree mode\n");
 268
 269         return ret;
 270 }
 271
 272 /* Some config bits need to be set again on resume, handle them here. */
 273 static int kszphy_config_reset(struct phy_device *phydev)
 274 {
 275         struct kszphy_priv *priv = phydev->priv;
 276         int ret;
 277
 278         if (priv->rmii_ref_clk_sel) {
 279                 ret = kszphy_rmii_clk_sel(phydev, priv->rmii_ref_clk_sel_val);
 280                 if (ret) {
 281                         phydev_err(phydev,
 282                                    "failed to set rmii reference clock\n");
 283                         return ret;
 284                 }
 285         }
 286
 287         if (priv->led_mode >= 0)
 288                 kszphy_setup_led(phydev, priv->type->led_mode_reg, priv->led_mode);
 289
 290         return 0;
 291 }
 292
 293 static int kszphy_config_init(struct phy_device *phydev)
 294 {
 295         struct kszphy_priv *priv = phydev->priv;
 296         const struct kszphy_type *type;
 297
 298         if (!priv)
 299                 return 0;
 300
 301         type = priv->type;
 302
 303         if (type->has_broadcast_disable)
 304                 kszphy_broadcast_disable(phydev);
 305
 306         if (type->has_nand_tree_disable)
 307                 kszphy_nand_tree_disable(phydev);
 308
 309         return kszphy_config_reset(phydev);
 310 }
 311
 312 static int ksz8041_config_init(struct phy_device *phydev)
 313 {
 314         struct device_node *of_node = phydev->mdio.dev.of_node;
 315
 316         /* Limit supported and advertised modes in fiber mode */
 317         if (of_property_read_bool(of_node, "micrel,fiber-mode")) {
 318                 phydev->dev_flags |= MICREL_PHY_FXEN;
 319                 phydev->supported &= SUPPORTED_100baseT_Full |
 320                                      SUPPORTED_100baseT_Half;
 321                 phydev->supported |= SUPPORTED_FIBRE;
 322                 phydev->advertising &= ADVERTISED_100baseT_Full |
 323                                        ADVERTISED_100baseT_Half;
 324                 phydev->advertising |= ADVERTISED_FIBRE;
 325                 phydev->autoneg = AUTONEG_DISABLE;
 326         }
 327
 328         return kszphy_config_init(phydev);
 329 }
 330
 331 static int ksz8041_config_aneg(struct phy_device *phydev)
 332 {
 333         /* Skip auto-negotiation in fiber mode */
 334         if (phydev->dev_flags & MICREL_PHY_FXEN) {
 335                 phydev->speed = SPEED_100;
 336                 return 0;
 337         }
 338
 339         return genphy_config_aneg(phydev);
 340 }
 341
 342 static int ksz9021_load_values_from_of(struct phy_device *phydev,
 343                                        const struct device_node *of_node,
 344                                        u16 reg,
 345                                        const char *field1, const char *field2,
 346                                        const char *field3, const char *field4)
 347 {
 348         int val1 = -1;
 349         int val2 = -2;
 350         int val3 = -3;
 351         int val4 = -4;
 352         int newval;
 353         int matches = 0;
 354
 355         if (!of_property_read_u32(of_node, field1, &val1))
 356                 matches++;
 357
 358         if (!of_property_read_u32(of_node, field2, &val2))
 359                 matches++;
 360
 361         if (!of_property_read_u32(of_node, field3, &val3))
 362                 matches++;
 363
 364         if (!of_property_read_u32(of_node, field4, &val4))
 365                 matches++;
 366
 367         if (!matches)
 368                 return 0;
 369
 370         if (matches < 4)
 371                 newval = kszphy_extended_read(phydev, reg);
 372         else
 373                 newval = 0;
 374
 375         if (val1 != -1)
 376                 newval = ((newval & 0xfff0) | ((val1 / PS_TO_REG) & 0xf) << 0);
 377
 378         if (val2 != -2)
 379                 newval = ((newval & 0xff0f) | ((val2 / PS_TO_REG) & 0xf) << 4);
 380
 381         if (val3 != -3)
 382                 newval = ((newval & 0xf0ff) | ((val3 / PS_TO_REG) & 0xf) << 8);
 383
 384         if (val4 != -4)
 385                 newval = ((newval & 0x0fff) | ((val4 / PS_TO_REG) & 0xf) << 12);
 386
 387         return kszphy_extended_write(phydev, reg, newval);
 388 }
 389
 390 static int ksz9021_config_init(struct phy_device *phydev)
 391 {
 392         const struct device *dev = &phydev->mdio.dev;
 393         const struct device_node *of_node = dev->of_node;
 394         const struct device *dev_walker;
 395
 396         /* The Micrel driver has a deprecated option to place phy OF
 397          * properties in the MAC node. Walk up the tree of devices to
 398          * find a device with an OF node.
 399          */
 400         dev_walker = &phydev->mdio.dev;
 401         do {
 402                 of_node = dev_walker->of_node;
 403                 dev_walker = dev_walker->parent;
 404
 405         } while (!of_node && dev_walker);
 406
 407         if (of_node) {
 408                 ksz9021_load_values_from_of(phydev, of_node,
 409                                     MII_KSZPHY_CLK_CONTROL_PAD_SKEW,
 410                                     "txen-skew-ps", "txc-skew-ps",
 411                                     "rxdv-skew-ps", "rxc-skew-ps");
 412                 ksz9021_load_values_from_of(phydev, of_node,
 413                                     MII_KSZPHY_RX_DATA_PAD_SKEW,
 414                                     "rxd0-skew-ps", "rxd1-skew-ps",
 415                                     "rxd2-skew-ps", "rxd3-skew-ps");
 416                 ksz9021_load_values_from_of(phydev, of_node,
 417                                     MII_KSZPHY_TX_DATA_PAD_SKEW,
 418                                     "txd0-skew-ps", "txd1-skew-ps",
 419                                     "txd2-skew-ps", "txd3-skew-ps");
 420         }
 421         return 0;
 422 }
 423
 424 #define MII_KSZ9031RN_MMD_CTRL_REG      0x0d
 425 #define MII_KSZ9031RN_MMD_REGDATA_REG   0x0e
 426 #define OP_DATA                         1
 427 #define KSZ9031_PS_TO_REG               60
 428
 429 /* Extended registers */
 430 /* MMD Address 0x0 */
 431 #define MII_KSZ9031RN_FLP_BURST_TX_LO   3
 432 #define MII_KSZ9031RN_FLP_BURST_TX_HI   4
 433
 434 /* MMD Address 0x2 */
 435 #define MII_KSZ9031RN_CONTROL_PAD_SKEW  4
 436 #define MII_KSZ9031RN_RX_DATA_PAD_SKEW  5
 437 #define MII_KSZ9031RN_TX_DATA_PAD_SKEW  6
 438 #define MII_KSZ9031RN_CLK_PAD_SKEW      8
 439
 440 /* MMD Address 0x1C */
 441 #define MII_KSZ9031RN_EDPD              0x23
 442 #define MII_KSZ9031RN_EDPD_ENABLE       BIT(0)
 443
 444 static int ksz9031_extended_write(struct phy_device *phydev,
 445                                   u8 mode, u32 dev_addr, u32 regnum, u16 val)
 446 {
 447         phy_write(phydev, MII_KSZ9031RN_MMD_CTRL_REG, dev_addr);
 448         phy_write(phydev, MII_KSZ9031RN_MMD_REGDATA_REG, regnum);
 449         phy_write(phydev, MII_KSZ9031RN_MMD_CTRL_REG, (mode << 14) | dev_addr);
 450         return phy_write(phydev, MII_KSZ9031RN_MMD_REGDATA_REG, val);
 451 }
 452
 453 static int ksz9031_extended_read(struct phy_device *phydev,
 454                                  u8 mode, u32 dev_addr, u32 regnum)
 455 {
 456         phy_write(phydev, MII_KSZ9031RN_MMD_CTRL_REG, dev_addr);
 457         phy_write(phydev, MII_KSZ9031RN_MMD_REGDATA_REG, regnum);
 458         phy_write(phydev, MII_KSZ9031RN_MMD_CTRL_REG, (mode << 14) | dev_addr);
 459         return phy_read(phydev, MII_KSZ9031RN_MMD_REGDATA_REG);
 460 }
 461
 462 static int ksz9031_of_load_skew_values(struct phy_device *phydev,
 463                                        const struct device_node *of_node,
 464                                        u16 reg, size_t field_sz,
 465                                        const char *field[], u8 numfields)
 466 {
 467         int val[4] = {-1, -2, -3, -4};
 468         int matches = 0;
 469         u16 mask;
 470         u16 maxval;
 471         u16 newval;
 472         int i;
 473
 474         for (i = 0; i < numfields; i++)
 475                 if (!of_property_read_u32(of_node, field[i], val + i))
 476                         matches++;
 477
 478         if (!matches)
 479                 return 0;
 480
 481         if (matches < numfields)
 482                 newval = ksz9031_extended_read(phydev, OP_DATA, 2, reg);
 483         else
 484                 newval = 0;
 485
 486         maxval = (field_sz == 4) ? 0xf : 0x1f;
 487         for (i = 0; i < numfields; i++)
 488                 if (val[i] != -(i + 1)) {
 489                         mask = 0xffff;
 490                         mask ^= maxval << (field_sz * i);
 491                         newval = (newval & mask) |
 492                                 (((val[i] / KSZ9031_PS_TO_REG) & maxval)
 493                                         << (field_sz * i));
 494                 }
 495
 496         return ksz9031_extended_write(phydev, OP_DATA, 2, reg, newval);
 497 }
 498
 499 /* Center KSZ9031RNX FLP timing at 16ms. */
 500 static int ksz9031_center_flp_timing(struct phy_device *phydev)
 501 {
 502         int result;
 503
 504         result = ksz9031_extended_write(phydev, OP_DATA, 0,
 505                                         MII_KSZ9031RN_FLP_BURST_TX_HI, 0x0006);
 506         if (result)
 507                 return result;
 508
 509         result = ksz9031_extended_write(phydev, OP_DATA, 0,
 510                                         MII_KSZ9031RN_FLP_BURST_TX_LO, 0x1A80);
 511         if (result)
 512                 return result;
 513
 514         return genphy_restart_aneg(phydev);
 515 }
 516
 517 /* Enable energy-detect power-down mode */
 518 static int ksz9031_enable_edpd(struct phy_device *phydev)
 519 {
 520         int reg;
 521
 522         reg = ksz9031_extended_read(phydev, OP_DATA, 0x1C, MII_KSZ9031RN_EDPD);
 523         if (reg < 0)
 524                 return reg;
 525         return ksz9031_extended_write(phydev, OP_DATA, 0x1C, MII_KSZ9031RN_EDPD,
 526                                       reg | MII_KSZ9031RN_EDPD_ENABLE);
 527 }
 528
 529 static int ksz9031_config_init(struct phy_device *phydev)
 530 {
 531         const struct device *dev = &phydev->mdio.dev;
 532         const struct device_node *of_node = dev->of_node;
 533         static const char *clk_skews[2] = {"rxc-skew-ps", "txc-skew-ps"};
 534         static const char *rx_data_skews[4] = {
 535                 "rxd0-skew-ps", "rxd1-skew-ps",
 536                 "rxd2-skew-ps", "rxd3-skew-ps"
 537         };
 538         static const char *tx_data_skews[4] = {
 539                 "txd0-skew-ps", "txd1-skew-ps",
 540                 "txd2-skew-ps", "txd3-skew-ps"
 541         };
 542         static const char *control_skews[2] = {"txen-skew-ps", "rxdv-skew-ps"};
 543         const struct device *dev_walker;
 544         int result;
 545
 546         result = ksz9031_enable_edpd(phydev);
 547         if (result < 0)
 548                 return result;
 549
 550         /* The Micrel driver has a deprecated option to place phy OF
 551          * properties in the MAC node. Walk up the tree of devices to
 552          * find a device with an OF node.
 553          */
 554         dev_walker = &phydev->mdio.dev;
 555         do {
 556                 of_node = dev_walker->of_node;
 557                 dev_walker = dev_walker->parent;
 558         } while (!of_node && dev_walker);
 559
 560         if (of_node) {
 561                 ksz9031_of_load_skew_values(phydev, of_node,
 562                                 MII_KSZ9031RN_CLK_PAD_SKEW, 5,
 563                                 clk_skews, 2);
 564
 565                 ksz9031_of_load_skew_values(phydev, of_node,
 566                                 MII_KSZ9031RN_CONTROL_PAD_SKEW, 4,
 567                                 control_skews, 2);
 568
 569                 ksz9031_of_load_skew_values(phydev, of_node,
 570                                 MII_KSZ9031RN_RX_DATA_PAD_SKEW, 4,
 571                                 rx_data_skews, 4);
 572
 573                 ksz9031_of_load_skew_values(phydev, of_node,
 574                                 MII_KSZ9031RN_TX_DATA_PAD_SKEW, 4,
 575                                 tx_data_skews, 4);
 576
 577                 /* Silicon Errata Sheet (DS80000691D or DS80000692D):
 578                  * When the device links in the 1000BASE-T slave mode only,
 579                  * the optional 125MHz reference output clock (CLK125_NDO)
 580                  * has wide duty cycle variation.
 581                  *
 582                  * The optional CLK125_NDO clock does not meet the RGMII
 583                  * 45/55 percent (min/max) duty cycle requirement and therefore
 584                  * cannot be used directly by the MAC side for clocking
 585                  * applications that have setup/hold time requirements on
 586                  * rising and falling clock edges.
 587                  *
 588                  * Workaround:
 589                  * Force the phy to be the master to receive a stable clock
 590                  * which meets the duty cycle requirement.
 591                  */
 592                 if (of_property_read_bool(of_node, "micrel,force-master")) {
 593                         result = phy_read(phydev, MII_CTRL1000);
 594                         if (result < 0)
 595                                 goto err_force_master;
 596
 597                         /* enable master mode, config & prefer master */
 598                         result |= CTL1000_ENABLE_MASTER | CTL1000_AS_MASTER;
 599                         result = phy_write(phydev, MII_CTRL1000, result);
 600                         if (result < 0)
 601                                 goto err_force_master;
 602                 }
 603         }
 604
 605         return ksz9031_center_flp_timing(phydev);
 606
 607 err_force_master:
 608         phydev_err(phydev, "failed to force the phy to master mode\n");
 609         return result;
 610 }
 611
 612 #define KSZ9131_SKEW_5BIT_MAX   2400
 613 #define KSZ9131_SKEW_4BIT_MAX   800
 614 #define KSZ9131_OFFSET          700
 615 #define KSZ9131_STEP            100
 616
 617 static int ksz9131_of_load_skew_values(struct phy_device *phydev,
 618                                        struct device_node *of_node,
 619                                        u16 reg, size_t field_sz,
 620                                        char *field[], u8 numfields)
 621 {
 622         int val[4] = {-(1 + KSZ9131_OFFSET), -(2 + KSZ9131_OFFSET),
 623                       -(3 + KSZ9131_OFFSET), -(4 + KSZ9131_OFFSET)};
 624         int skewval, skewmax = 0;
 625         int matches = 0;
 626         u16 maxval;
 627         u16 newval;
 628         u16 mask;
 629         int i;
 630
 631         /* psec properties in dts should mean x pico seconds */
 632         if (field_sz == 5)
 633                 skewmax = KSZ9131_SKEW_5BIT_MAX;
 634         else
 635                 skewmax = KSZ9131_SKEW_4BIT_MAX;
 636
 637         for (i = 0; i < numfields; i++)
 638                 if (!of_property_read_s32(of_node, field[i], &skewval)) {
 639                         if (skewval < -KSZ9131_OFFSET)
 640                                 skewval = -KSZ9131_OFFSET;
 641                         else if (skewval > skewmax)
 642                                 skewval = skewmax;
 643
 644                         val[i] = skewval + KSZ9131_OFFSET;
 645                         matches++;
 646                 }
 647
 648         if (!matches)
 649                 return 0;
 650
 651         if (matches < numfields)
 652                 newval = ksz9031_extended_read(phydev, OP_DATA, 2, reg);
 653         else
 654                 newval = 0;
 655
 656         maxval = (field_sz == 4) ? 0xf : 0x1f;
 657         for (i = 0; i < numfields; i++)
 658                 if (val[i] != -(i + 1 + KSZ9131_OFFSET)) {
 659                         mask = 0xffff;
 660                         mask ^= maxval << (field_sz * i);
 661                         newval = (newval & mask) |
 662                                 (((val[i] / KSZ9131_STEP) & maxval)
 663                                         << (field_sz * i));
 664                 }
 665
 666         return ksz9031_extended_write(phydev, OP_DATA, 2, reg, newval);
 667 }
 668
 669 static int ksz9131_config_init(struct phy_device *phydev)
 670 {
 671         const struct device *dev = &phydev->mdio.dev;
 672         struct device_node *of_node = dev->of_node;
 673         char *clk_skews[2] = {"rxc-skew-psec", "txc-skew-psec"};
 674         char *rx_data_skews[4] = {
 675                 "rxd0-skew-psec", "rxd1-skew-psec",
 676                 "rxd2-skew-psec", "rxd3-skew-psec"
 677         };
 678         char *tx_data_skews[4] = {
 679                 "txd0-skew-psec", "txd1-skew-psec",
 680                 "txd2-skew-psec", "txd3-skew-psec"
 681         };
 682         char *control_skews[2] = {"txen-skew-psec", "rxdv-skew-psec"};
 683         const struct device *dev_walker;
 684         int ret;
 685
 686         dev_walker = &phydev->mdio.dev;
 687         do {
 688                 of_node = dev_walker->of_node;
 689                 dev_walker = dev_walker->parent;
 690         } while (!of_node && dev_walker);
 691
 692         if (!of_node)
 693                 return 0;
 694
 695         ret = ksz9131_of_load_skew_values(phydev, of_node,
 696                                           MII_KSZ9031RN_CLK_PAD_SKEW, 5,
 697                                           clk_skews, 2);
 698         if (ret < 0)
 699                 return ret;
 700
 701         ret = ksz9131_of_load_skew_values(phydev, of_node,
 702                                           MII_KSZ9031RN_CONTROL_PAD_SKEW, 4,
 703                                           control_skews, 2);
 704         if (ret < 0)
 705                 return ret;
 706
 707         ret = ksz9131_of_load_skew_values(phydev, of_node,
 708                                           MII_KSZ9031RN_RX_DATA_PAD_SKEW, 4,
 709                                           rx_data_skews, 4);
 710         if (ret < 0)
 711                 return ret;
 712
 713         ret = ksz9131_of_load_skew_values(phydev, of_node,
 714                                           MII_KSZ9031RN_TX_DATA_PAD_SKEW, 4,
 715                                           tx_data_skews, 4);
 716         if (ret < 0)
 717                 return ret;
 718
 719         return 0;
 720 }
 721
 722 #define KSZ8873MLL_GLOBAL_CONTROL_4     0x06
 723 #define KSZ8873MLL_GLOBAL_CONTROL_4_DUPLEX      BIT(6)
 724 #define KSZ8873MLL_GLOBAL_CONTROL_4_SPEED       BIT(4)
 725 static int ksz8873mll_read_status(struct phy_device *phydev)
 726 {
 727         int regval;
 728
 729         /* dummy read */
 730         regval = phy_read(phydev, KSZ8873MLL_GLOBAL_CONTROL_4);
 731
 732         regval = phy_read(phydev, KSZ8873MLL_GLOBAL_CONTROL_4);
 733
 734         if (regval & KSZ8873MLL_GLOBAL_CONTROL_4_DUPLEX)
 735                 phydev->duplex = DUPLEX_HALF;
 736         else
 737                 phydev->duplex = DUPLEX_FULL;
 738
 739         if (regval & KSZ8873MLL_GLOBAL_CONTROL_4_SPEED)
 740                 phydev->speed = SPEED_10;
 741         else
 742                 phydev->speed = SPEED_100;
 743
 744         phydev->link = 1;
 745         phydev->pause = phydev->asym_pause = 0;
 746
 747         return 0;
 748 }
 749
 750 static int ksz9031_read_status(struct phy_device *phydev)
 751 {
 752         int err;
 753         int regval;
 754
 755         err = genphy_read_status(phydev);
 756         if (err)
 757                 return err;
 758
 759         /* Make sure the PHY is not broken. Read idle error count,
 760          * and reset the PHY if it is maxed out.
 761          */
 762         regval = phy_read(phydev, MII_STAT1000);
 763         if ((regval & 0xFF) == 0xFF) {
 764                 phy_init_hw(phydev);
 765                 phydev->link = 0;
 766                 if (phydev->drv->config_intr && phy_interrupt_is_valid(phydev))
 767                         phydev->drv->config_intr(phydev);
 768                 return genphy_config_aneg(phydev);
 769         }
 770
 771         return 0;
 772 }
 773
 774 static int ksz8873mll_config_aneg(struct phy_device *phydev)
 775 {
 776         return 0;
 777 }
 778
 779 static int kszphy_get_sset_count(struct phy_device *phydev)
 780 {
 781         return ARRAY_SIZE(kszphy_hw_stats);
 782 }
 783
 784 static void kszphy_get_strings(struct phy_device *phydev, u8 *data)
 785 {
 786         int i;
 787
 788         for (i = 0; i < ARRAY_SIZE(kszphy_hw_stats); i++) {
 789                 strlcpy(data + i * ETH_GSTRING_LEN,
 790                         kszphy_hw_stats[i].string, ETH_GSTRING_LEN);
 791         }
 792 }
 793
 794 static u64 kszphy_get_stat(struct phy_device *phydev, int i)
 795 {
 796         struct kszphy_hw_stat stat = kszphy_hw_stats[i];
 797         struct kszphy_priv *priv = phydev->priv;
 798         int val;
 799         u64 ret;
 800
 801         val = phy_read(phydev, stat.reg);
 802         if (val < 0) {
 803                 ret = U64_MAX;
 804         } else {
 805                 val = val & ((1 << stat.bits) - 1);
 806                 priv->stats[i] += val;
 807                 ret = priv->stats[i];
 808         }
 809
 810         return ret;
 811 }
 812
 813 static void kszphy_get_stats(struct phy_device *phydev,
 814                              struct ethtool_stats *stats, u64 *data)
 815 {
 816         int i;
 817
 818         for (i = 0; i < ARRAY_SIZE(kszphy_hw_stats); i++)
 819                 data[i] = kszphy_get_stat(phydev, i);
 820 }
 821
 822 static int kszphy_suspend(struct phy_device *phydev)
 823 {
 824         /* Disable PHY Interrupts */
 825         if (phy_interrupt_is_valid(phydev)) {
 826                 phydev->interrupts = PHY_INTERRUPT_DISABLED;
 827                 if (phydev->drv->config_intr)
 828                         phydev->drv->config_intr(phydev);
 829         }
 830
 831         return genphy_suspend(phydev);
 832 }
 833
 834 static int kszphy_resume(struct phy_device *phydev)
 835 {
 836         int ret;
 837
 838         genphy_resume(phydev);
 839
 840         ret = kszphy_config_reset(phydev);
 841         if (ret)
 842                 return ret;
 843
 844         /* Enable PHY Interrupts */
 845         if (phy_interrupt_is_valid(phydev)) {
 846                 phydev->interrupts = PHY_INTERRUPT_ENABLED;
 847                 if (phydev->drv->config_intr)
 848                         phydev->drv->config_intr(phydev);
 849         }
 850
 851         return 0;
 852 }
 853
 854 static int kszphy_probe(struct phy_device *phydev)
 855 {
 856         const struct kszphy_type *type = phydev->drv->driver_data;
 857         const struct device_node *np = phydev->mdio.dev.of_node;
 858         struct kszphy_priv *priv;
 859         struct clk *clk;
 860         int ret;
 861
 862         priv = devm_kzalloc(&phydev->mdio.dev, sizeof(*priv), GFP_KERNEL);
 863         if (!priv)
 864                 return -ENOMEM;
 865
 866         phydev->priv = priv;
 867
 868         priv->type = type;
 869
 870         if (type->led_mode_reg) {
 871                 ret = of_property_read_u32(np, "micrel,led-mode",
 872                                 &priv->led_mode);
 873                 if (ret)
 874                         priv->led_mode = -1;
 875
 876                 if (priv->led_mode > 3) {
 877                         phydev_err(phydev, "invalid led mode: 0x%02x\n",
 878                                    priv->led_mode);
 879                         priv->led_mode = -1;
 880                 }
 881         } else {
 882                 priv->led_mode = -1;
 883         }
 884
 885         clk = devm_clk_get(&phydev->mdio.dev, "rmii-ref");
 886         /* NOTE: clk may be NULL if building without CONFIG_HAVE_CLK */
 887         if (!IS_ERR_OR_NULL(clk)) {
 888                 unsigned long rate = clk_get_rate(clk);
 889                 bool rmii_ref_clk_sel_25_mhz;
 890
 891                 priv->rmii_ref_clk_sel = type->has_rmii_ref_clk_sel;
 892                 rmii_ref_clk_sel_25_mhz = of_property_read_bool(np,
 893                                 "micrel,rmii-reference-clock-select-25-mhz");
 894
 895                 if (rate > 24500000 && rate < 25500000) {
 896                         priv->rmii_ref_clk_sel_val = rmii_ref_clk_sel_25_mhz;
 897                 } else if (rate > 49500000 && rate < 50500000) {
 898                         priv->rmii_ref_clk_sel_val = !rmii_ref_clk_sel_25_mhz;
 899                 } else {
 900                         phydev_err(phydev, "Clock rate out of range: %ld\n",
 901                                    rate);
 902                         return -EINVAL;
 903                 }
 904         }
 905
 906         /* Support legacy board-file configuration */
 907         if (phydev->dev_flags & MICREL_PHY_50MHZ_CLK) {
 908                 priv->rmii_ref_clk_sel = true;
 909                 priv->rmii_ref_clk_sel_val = true;
 910         }
 911
 912         return 0;
 913 }
 914
 915 static struct phy_driver ksphy_driver[] = {
 916 {
 917         .phy_id         = PHY_ID_KS8737,
 918         .phy_id_mask    = MICREL_PHY_ID_MASK,
 919         .name           = "Micrel KS8737",
 920         .features       = PHY_BASIC_FEATURES,
 921         .driver_data    = &ks8737_type,
 922         .config_init    = kszphy_config_init,
 923         .ack_interrupt  = kszphy_ack_interrupt,
 924         .config_intr    = kszphy_config_intr,
 925         .suspend        = genphy_suspend,
 926         .resume         = genphy_resume,
 927 }, {
 928         .phy_id         = PHY_ID_KSZ8021,
 929         .phy_id_mask    = 0x00ffffff,
 930         .name           = "Micrel KSZ8021 or KSZ8031",
 931         .features       = PHY_BASIC_FEATURES,
 932         .driver_data    = &ksz8021_type,
 933         .probe          = kszphy_probe,
 934         .config_init    = kszphy_config_init,
 935         .ack_interrupt  = kszphy_ack_interrupt,
 936         .config_intr    = kszphy_config_intr,
 937         .get_sset_count = kszphy_get_sset_count,
 938         .get_strings    = kszphy_get_strings,
 939         .get_stats      = kszphy_get_stats,
 940         .suspend        = genphy_suspend,
 941         .resume         = genphy_resume,
 942 }, {
 943         .phy_id         = PHY_ID_KSZ8031,
 944         .phy_id_mask    = 0x00ffffff,
 945         .name           = "Micrel KSZ8031",
 946         .features       = PHY_BASIC_FEATURES,
 947         .driver_data    = &ksz8021_type,
 948         .probe          = kszphy_probe,
 949         .config_init    = kszphy_config_init,
 950         .ack_interrupt  = kszphy_ack_interrupt,
 951         .config_intr    = kszphy_config_intr,
 952         .get_sset_count = kszphy_get_sset_count,
 953         .get_strings    = kszphy_get_strings,
 954         .get_stats      = kszphy_get_stats,
 955         .suspend        = genphy_suspend,
 956         .resume         = genphy_resume,
 957 }, {
 958         .phy_id         = PHY_ID_KSZ8041,
 959         .phy_id_mask    = MICREL_PHY_ID_MASK,
 960         .name           = "Micrel KSZ8041",
 961         .features       = PHY_BASIC_FEATURES,
 962         .driver_data    = &ksz8041_type,
 963         .probe          = kszphy_probe,
 964         .config_init    = ksz8041_config_init,
 965         .config_aneg    = ksz8041_config_aneg,
 966         .ack_interrupt  = kszphy_ack_interrupt,
 967         .config_intr    = kszphy_config_intr,
 968         .get_sset_count = kszphy_get_sset_count,
 969         .get_strings    = kszphy_get_strings,
 970         .get_stats      = kszphy_get_stats,
 971         .suspend        = genphy_suspend,
 972         .resume         = genphy_resume,
 973 }, {
 974         .phy_id         = PHY_ID_KSZ8041RNLI,
 975         .phy_id_mask    = MICREL_PHY_ID_MASK,
 976         .name           = "Micrel KSZ8041RNLI",
 977         .features       = PHY_BASIC_FEATURES,
 978         .driver_data    = &ksz8041_type,
 979         .probe          = kszphy_probe,
 980         .config_init    = kszphy_config_init,
 981         .ack_interrupt  = kszphy_ack_interrupt,
 982         .config_intr    = kszphy_config_intr,
 983         .get_sset_count = kszphy_get_sset_count,
 984         .get_strings    = kszphy_get_strings,
 985         .get_stats      = kszphy_get_stats,
 986         .suspend        = genphy_suspend,
 987         .resume         = genphy_resume,
 988 }, {
 989         .phy_id         = PHY_ID_KSZ8051,
 990         .phy_id_mask    = MICREL_PHY_ID_MASK,
 991         .name           = "Micrel KSZ8051",
 992         .features       = PHY_BASIC_FEATURES,
 993         .driver_data    = &ksz8051_type,
 994         .probe          = kszphy_probe,
 995         .config_init    = kszphy_config_init,
 996         .ack_interrupt  = kszphy_ack_interrupt,
 997         .config_intr    = kszphy_config_intr,
 998         .get_sset_count = kszphy_get_sset_count,
 999         .get_strings    = kszphy_get_strings,
1000         .get_stats      = kszphy_get_stats,
1001         .suspend        = genphy_suspend,
1002         .resume         = genphy_resume,
1003 }, {
1004         .phy_id         = PHY_ID_KSZ8001,
1005         .name           = "Micrel KSZ8001 or KS8721",
1006         .phy_id_mask    = 0x00fffffc,
1007         .features       = PHY_BASIC_FEATURES,
1008         .driver_data    = &ksz8041_type,
1009         .probe          = kszphy_probe,
1010         .config_init    = kszphy_config_init,
1011         .ack_interrupt  = kszphy_ack_interrupt,
1012         .config_intr    = kszphy_config_intr,
1013         .get_sset_count = kszphy_get_sset_count,
1014         .get_strings    = kszphy_get_strings,
1015         .get_stats      = kszphy_get_stats,
1016         .suspend        = genphy_suspend,
1017         .resume         = genphy_resume,
1018 }, {
1019         .phy_id         = PHY_ID_KSZ8081,
1020         .name           = "Micrel KSZ8081 or KSZ8091",
1021         .phy_id_mask    = MICREL_PHY_ID_MASK,
1022         .features       = PHY_BASIC_FEATURES,
1023         .driver_data    = &ksz8081_type,
1024         .probe          = kszphy_probe,
1025         .config_init    = kszphy_config_init,
1026         .ack_interrupt  = kszphy_ack_interrupt,
1027         .config_intr    = kszphy_config_intr,
1028         .get_sset_count = kszphy_get_sset_count,
1029         .get_strings    = kszphy_get_strings,
1030         .get_stats      = kszphy_get_stats,
1031         .suspend        = kszphy_suspend,
1032         .resume         = kszphy_resume,
1033 }, {
1034         .phy_id         = PHY_ID_KSZ8061,
1035         .name           = "Micrel KSZ8061",
1036         .phy_id_mask    = MICREL_PHY_ID_MASK,
1037         .features       = PHY_BASIC_FEATURES,
1038         .config_init    = kszphy_config_init,
1039         .ack_interrupt  = kszphy_ack_interrupt,
1040         .config_intr    = kszphy_config_intr,
1041         .suspend        = genphy_suspend,
1042         .resume         = genphy_resume,
1043 }, {
1044         .phy_id         = PHY_ID_KSZ9021,
1045         .phy_id_mask    = 0x000ffffe,
1046         .name           = "Micrel KSZ9021 Gigabit PHY",
1047         .features       = PHY_GBIT_FEATURES,
1048         .driver_data    = &ksz9021_type,
1049         .probe          = kszphy_probe,
1050         .config_init    = ksz9021_config_init,
1051         .ack_interrupt  = kszphy_ack_interrupt,
1052         .config_intr    = kszphy_config_intr,
1053         .get_sset_count = kszphy_get_sset_count,
1054         .get_strings    = kszphy_get_strings,
1055         .get_stats      = kszphy_get_stats,
1056         .suspend        = genphy_suspend,
1057         .resume         = genphy_resume,
1058         .read_mmd       = genphy_read_mmd_unsupported,
1059         .write_mmd      = genphy_write_mmd_unsupported,
1060 }, {
1061         .phy_id         = PHY_ID_KSZ9031,
1062         .phy_id_mask    = MICREL_PHY_ID_MASK,
1063         .name           = "Micrel KSZ9031 Gigabit PHY",
1064         .features       = PHY_GBIT_FEATURES,
1065         .driver_data    = &ksz9021_type,
1066         .probe          = kszphy_probe,
1067         .config_init    = ksz9031_config_init,
1068         .read_status    = ksz9031_read_status,
1069         .ack_interrupt  = kszphy_ack_interrupt,
1070         .config_intr    = kszphy_config_intr,
1071         .get_sset_count = kszphy_get_sset_count,
1072         .get_strings    = kszphy_get_strings,
1073         .get_stats      = kszphy_get_stats,
1074         .suspend        = genphy_suspend,
1075         .resume         = kszphy_resume,
1076 }, {
1077         .phy_id         = PHY_ID_KSZ9131,
1078         .phy_id_mask    = MICREL_PHY_ID_MASK,
1079         .name           = "Microchip KSZ9131 Gigabit PHY",
1080         .features       = PHY_GBIT_FEATURES,
1081         .driver_data    = &ksz9021_type,
1082         .probe          = kszphy_probe,
1083         .config_init    = ksz9131_config_init,
1084         .read_status    = ksz9031_read_status,
1085         .ack_interrupt  = kszphy_ack_interrupt,
1086         .config_intr    = kszphy_config_intr,
1087         .get_sset_count = kszphy_get_sset_count,
1088         .get_strings    = kszphy_get_strings,
1089         .get_stats      = kszphy_get_stats,
1090         .suspend        = genphy_suspend,
1091         .resume         = kszphy_resume,
1092 }, {
1093         .phy_id         = PHY_ID_KSZ8873MLL,
1094         .phy_id_mask    = MICREL_PHY_ID_MASK,
1095         .name           = "Micrel KSZ8873MLL Switch",
1096         .config_init    = kszphy_config_init,
1097         .config_aneg    = ksz8873mll_config_aneg,
1098         .read_status    = ksz8873mll_read_status,
1099         .suspend        = genphy_suspend,
1100         .resume         = genphy_resume,
1101 }, {
1102         .phy_id         = PHY_ID_KSZ886X,
1103         .phy_id_mask    = MICREL_PHY_ID_MASK,
1104         .name           = "Micrel KSZ886X Switch",
1105         .features       = PHY_BASIC_FEATURES,
1106         .config_init    = kszphy_config_init,
1107         .suspend        = genphy_suspend,
1108         .resume         = genphy_resume,
1109 }, {
1110         .phy_id         = PHY_ID_KSZ8795,
1111         .phy_id_mask    = MICREL_PHY_ID_MASK,
1112         .name           = "Micrel KSZ8795",
1113         .features       = PHY_BASIC_FEATURES,
1114         .config_init    = kszphy_config_init,
1115         .config_aneg    = ksz8873mll_config_aneg,
1116         .read_status    = ksz8873mll_read_status,
1117         .suspend        = genphy_suspend,
1118         .resume         = genphy_resume,
1119 }, {
1120         .phy_id         = PHY_ID_KSZ9477,
1121         .phy_id_mask    = MICREL_PHY_ID_MASK,
1122         .name           = "Microchip KSZ9477",
1123         .features       = PHY_GBIT_FEATURES,
1124         .config_init    = kszphy_config_init,
1125         .suspend        = genphy_suspend,
1126         .resume         = genphy_resume,
1127 } };
1128
1129 module_phy_driver(ksphy_driver);
1130
1131 MODULE_DESCRIPTION("Micrel PHY driver");
1132 MODULE_AUTHOR("David J. Choi");
1133 MODULE_LICENSE("GPL");
1134
1135 static struct mdio_device_id __maybe_unused micrel_tbl[] = {
1136         { PHY_ID_KSZ9021, 0x000ffffe },
1137         { PHY_ID_KSZ9031, MICREL_PHY_ID_MASK },
1138         { PHY_ID_KSZ9131, MICREL_PHY_ID_MASK },
1139         { PHY_ID_KSZ8001, 0x00fffffc },
1140         { PHY_ID_KS8737, MICREL_PHY_ID_MASK },
1141         { PHY_ID_KSZ8021, 0x00ffffff },
1142         { PHY_ID_KSZ8031, 0x00ffffff },
1143         { PHY_ID_KSZ8041, MICREL_PHY_ID_MASK },
1144         { PHY_ID_KSZ8051, MICREL_PHY_ID_MASK },
1145         { PHY_ID_KSZ8061, MICREL_PHY_ID_MASK },
1146         { PHY_ID_KSZ8081, MICREL_PHY_ID_MASK },
1147         { PHY_ID_KSZ8873MLL, MICREL_PHY_ID_MASK },
1148         { PHY_ID_KSZ886X, MICREL_PHY_ID_MASK },
1149         { }
1150 };
1151
1152 MODULE_DEVICE_TABLE(mdio, micrel_tbl);