drivers/net/phy/microchip.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (C) 2015 Microchip Technology
   4  */
   5 #include <linux/kernel.h>
   6 #include <linux/module.h>
   7 #include <linux/mii.h>
   8 #include <linux/ethtool.h>
   9 #include <linux/phy.h>
  10 #include <linux/microchipphy.h>
  11 #include <linux/delay.h>
  12 #include <linux/of.h>
  13 #include <dt-bindings/net/microchip-lan78xx.h>
  14
  15 #define DRIVER_AUTHOR   "WOOJUNG HUH <woojung.huh@microchip.com>"
  16 #define DRIVER_DESC     "Microchip LAN88XX PHY driver"
  17
  18 struct lan88xx_priv {
  19         int     chip_id;
  20         int     chip_rev;
  21         __u32   wolopts;
  22 };
  23
  24 static int lan88xx_read_page(struct phy_device *phydev)
  25 {
  26         return __phy_read(phydev, LAN88XX_EXT_PAGE_ACCESS);
  27 }
  28
  29 static int lan88xx_write_page(struct phy_device *phydev, int page)
  30 {
  31         return __phy_write(phydev, LAN88XX_EXT_PAGE_ACCESS, page);
  32 }
  33
  34 static int lan88xx_phy_config_intr(struct phy_device *phydev)
  35 {
  36         int rc;
  37
  38         if (phydev->interrupts == PHY_INTERRUPT_ENABLED) {
  39                 /* unmask all source and clear them before enable */
  40                 rc = phy_write(phydev, LAN88XX_INT_MASK, 0x7FFF);
  41                 rc = phy_read(phydev, LAN88XX_INT_STS);
  42                 rc = phy_write(phydev, LAN88XX_INT_MASK,
  43                                LAN88XX_INT_MASK_MDINTPIN_EN_ |
  44                                LAN88XX_INT_MASK_LINK_CHANGE_);
  45         } else {
  46                 rc = phy_write(phydev, LAN88XX_INT_MASK, 0);
  47         }
  48
  49         return rc < 0 ? rc : 0;
  50 }
  51
  52 static int lan88xx_phy_ack_interrupt(struct phy_device *phydev)
  53 {
  54         int rc = phy_read(phydev, LAN88XX_INT_STS);
  55
  56         return rc < 0 ? rc : 0;
  57 }
  58
  59 static int lan88xx_suspend(struct phy_device *phydev)
  60 {
  61         struct lan88xx_priv *priv = phydev->priv;
  62
  63         /* do not power down PHY when WOL is enabled */
  64         if (!priv->wolopts)
  65                 genphy_suspend(phydev);
  66
  67         return 0;
  68 }
  69
  70 static int lan88xx_TR_reg_set(struct phy_device *phydev, u16 regaddr,
  71                               u32 data)
  72 {
  73         int val, save_page, ret = 0;
  74         u16 buf;
  75
  76         /* Save current page */
  77         save_page = phy_save_page(phydev);
  78         if (save_page < 0) {
  79                 phydev_warn(phydev, "Failed to get current page\n");
  80                 goto err;
  81         }
  82
  83         /* Switch to TR page */
  84         lan88xx_write_page(phydev, LAN88XX_EXT_PAGE_ACCESS_TR);
  85
  86         ret = __phy_write(phydev, LAN88XX_EXT_PAGE_TR_LOW_DATA,
  87                           (data & 0xFFFF));
  88         if (ret < 0) {
  89                 phydev_warn(phydev, "Failed to write TR low data\n");
  90                 goto err;
  91         }
  92
  93         ret = __phy_write(phydev, LAN88XX_EXT_PAGE_TR_HIGH_DATA,
  94                           (data & 0x00FF0000) >> 16);
  95         if (ret < 0) {
  96                 phydev_warn(phydev, "Failed to write TR high data\n");
  97                 goto err;
  98         }
  99
 100         /* Config control bits [15:13] of register */
 101         buf = (regaddr & ~(0x3 << 13));/* Clr [14:13] to write data in reg */
 102         buf |= 0x8000; /* Set [15] to Packet transmit */
 103
 104         ret = __phy_write(phydev, LAN88XX_EXT_PAGE_TR_CR, buf);
 105         if (ret < 0) {
 106                 phydev_warn(phydev, "Failed to write data in reg\n");
 107                 goto err;
 108         }
 109
 110         usleep_range(1000, 2000);/* Wait for Data to be written */
 111         val = __phy_read(phydev, LAN88XX_EXT_PAGE_TR_CR);
 112         if (!(val & 0x8000))
 113                 phydev_warn(phydev, "TR Register[0x%X] configuration failed\n",
 114                             regaddr);
 115 err:
 116         return phy_restore_page(phydev, save_page, ret);
 117 }
 118
 119 static void lan88xx_config_TR_regs(struct phy_device *phydev)
 120 {
 121         int err;
 122
 123         /* Get access to Channel 0x1, Node 0xF , Register 0x01.
 124          * Write 24-bit value 0x12B00A to register. Setting MrvlTrFix1000Kf,
 125          * MrvlTrFix1000Kp, MasterEnableTR bits.
 126          */
 127         err = lan88xx_TR_reg_set(phydev, 0x0F82, 0x12B00A);
 128         if (err < 0)
 129                 phydev_warn(phydev, "Failed to Set Register[0x0F82]\n");
 130
 131         /* Get access to Channel b'10, Node b'1101, Register 0x06.
 132          * Write 24-bit value 0xD2C46F to register. Setting SSTrKf1000Slv,
 133          * SSTrKp1000Mas bits.
 134          */
 135         err = lan88xx_TR_reg_set(phydev, 0x168C, 0xD2C46F);
 136         if (err < 0)
 137                 phydev_warn(phydev, "Failed to Set Register[0x168C]\n");
 138
 139         /* Get access to Channel b'10, Node b'1111, Register 0x11.
 140          * Write 24-bit value 0x620 to register. Setting rem_upd_done_thresh
 141          * bits
 142          */
 143         err = lan88xx_TR_reg_set(phydev, 0x17A2, 0x620);
 144         if (err < 0)
 145                 phydev_warn(phydev, "Failed to Set Register[0x17A2]\n");
 146
 147         /* Get access to Channel b'10, Node b'1101, Register 0x10.
 148          * Write 24-bit value 0xEEFFDD to register. Setting
 149          * eee_TrKp1Long_1000, eee_TrKp2Long_1000, eee_TrKp3Long_1000,
 150          * eee_TrKp1Short_1000,eee_TrKp2Short_1000, eee_TrKp3Short_1000 bits.
 151          */
 152         err = lan88xx_TR_reg_set(phydev, 0x16A0, 0xEEFFDD);
 153         if (err < 0)
 154                 phydev_warn(phydev, "Failed to Set Register[0x16A0]\n");
 155
 156         /* Get access to Channel b'10, Node b'1101, Register 0x13.
 157          * Write 24-bit value 0x071448 to register. Setting
 158          * slv_lpi_tr_tmr_val1, slv_lpi_tr_tmr_val2 bits.
 159          */
 160         err = lan88xx_TR_reg_set(phydev, 0x16A6, 0x071448);
 161         if (err < 0)
 162                 phydev_warn(phydev, "Failed to Set Register[0x16A6]\n");
 163
 164         /* Get access to Channel b'10, Node b'1101, Register 0x12.
 165          * Write 24-bit value 0x13132F to register. Setting
 166          * slv_sigdet_timer_val1, slv_sigdet_timer_val2 bits.
 167          */
 168         err = lan88xx_TR_reg_set(phydev, 0x16A4, 0x13132F);
 169         if (err < 0)
 170                 phydev_warn(phydev, "Failed to Set Register[0x16A4]\n");
 171
 172         /* Get access to Channel b'10, Node b'1101, Register 0x14.
 173          * Write 24-bit value 0x0 to register. Setting eee_3level_delay,
 174          * eee_TrKf_freeze_delay bits.
 175          */
 176         err = lan88xx_TR_reg_set(phydev, 0x16A8, 0x0);
 177         if (err < 0)
 178                 phydev_warn(phydev, "Failed to Set Register[0x16A8]\n");
 179
 180         /* Get access to Channel b'01, Node b'1111, Register 0x34.
 181          * Write 24-bit value 0x91B06C to register. Setting
 182          * FastMseSearchThreshLong1000, FastMseSearchThreshShort1000,
 183          * FastMseSearchUpdGain1000 bits.
 184          */
 185         err = lan88xx_TR_reg_set(phydev, 0x0FE8, 0x91B06C);
 186         if (err < 0)
 187                 phydev_warn(phydev, "Failed to Set Register[0x0FE8]\n");
 188
 189         /* Get access to Channel b'01, Node b'1111, Register 0x3E.
 190          * Write 24-bit value 0xC0A028 to register. Setting
 191          * FastMseKp2ThreshLong1000, FastMseKp2ThreshShort1000,
 192          * FastMseKp2UpdGain1000, FastMseKp2ExitEn1000 bits.
 193          */
 194         err = lan88xx_TR_reg_set(phydev, 0x0FFC, 0xC0A028);
 195         if (err < 0)
 196                 phydev_warn(phydev, "Failed to Set Register[0x0FFC]\n");
 197
 198         /* Get access to Channel b'01, Node b'1111, Register 0x35.
 199          * Write 24-bit value 0x041600 to register. Setting
 200          * FastMseSearchPhShNum1000, FastMseSearchClksPerPh1000,
 201          * FastMsePhChangeDelay1000 bits.
 202          */
 203         err = lan88xx_TR_reg_set(phydev, 0x0FEA, 0x041600);
 204         if (err < 0)
 205                 phydev_warn(phydev, "Failed to Set Register[0x0FEA]\n");
 206
 207         /* Get access to Channel b'10, Node b'1101, Register 0x03.
 208          * Write 24-bit value 0x000004 to register. Setting TrFreeze bits.
 209          */
 210         err = lan88xx_TR_reg_set(phydev, 0x1686, 0x000004);
 211         if (err < 0)
 212                 phydev_warn(phydev, "Failed to Set Register[0x1686]\n");
 213 }
 214
 215 static int lan88xx_probe(struct phy_device *phydev)
 216 {
 217         struct device *dev = &phydev->mdio.dev;
 218         struct lan88xx_priv *priv;
 219         u32 led_modes[4];
 220         int len;
 221
 222         priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
 223         if (!priv)
 224                 return -ENOMEM;
 225
 226         priv->wolopts = 0;
 227
 228         len = of_property_read_variable_u32_array(dev->of_node,
 229                                                   "microchip,led-modes",
 230                                                   led_modes,
 231                                                   0,
 232                                                   ARRAY_SIZE(led_modes));
 233         if (len >= 0) {
 234                 u32 reg = 0;
 235                 int i;
 236
 237                 for (i = 0; i < len; i++) {
 238                         if (led_modes[i] > 15)
 239                                 return -EINVAL;
 240                         reg |= led_modes[i] << (i * 4);
 241                 }
 242                 for (; i < ARRAY_SIZE(led_modes); i++)
 243                         reg |= LAN78XX_FORCE_LED_OFF << (i * 4);
 244                 (void)phy_write(phydev, LAN78XX_PHY_LED_MODE_SELECT, reg);
 245         } else if (len == -EOVERFLOW) {
 246                 return -EINVAL;
 247         }
 248
 249         /* these values can be used to identify internal PHY */
 250         priv->chip_id = phy_read_mmd(phydev, 3, LAN88XX_MMD3_CHIP_ID);
 251         priv->chip_rev = phy_read_mmd(phydev, 3, LAN88XX_MMD3_CHIP_REV);
 252
 253         phydev->priv = priv;
 254
 255         return 0;
 256 }
 257
 258 static void lan88xx_remove(struct phy_device *phydev)
 259 {
 260         struct device *dev = &phydev->mdio.dev;
 261         struct lan88xx_priv *priv = phydev->priv;
 262
 263         if (priv)
 264                 devm_kfree(dev, priv);
 265 }
 266
 267 static int lan88xx_set_wol(struct phy_device *phydev,
 268                            struct ethtool_wolinfo *wol)
 269 {
 270         struct lan88xx_priv *priv = phydev->priv;
 271
 272         priv->wolopts = wol->wolopts;
 273
 274         return 0;
 275 }
 276
 277 static void lan88xx_set_mdix(struct phy_device *phydev)
 278 {
 279         int buf;
 280         int val;
 281
 282         switch (phydev->mdix_ctrl) {
 283         case ETH_TP_MDI:
 284                 val = LAN88XX_EXT_MODE_CTRL_MDI_;
 285                 break;
 286         case ETH_TP_MDI_X:
 287                 val = LAN88XX_EXT_MODE_CTRL_MDI_X_;
 288                 break;
 289         case ETH_TP_MDI_AUTO:
 290                 val = LAN88XX_EXT_MODE_CTRL_AUTO_MDIX_;
 291                 break;
 292         default:
 293                 return;
 294         }
 295
 296         phy_write(phydev, LAN88XX_EXT_PAGE_ACCESS, LAN88XX_EXT_PAGE_SPACE_1);
 297         buf = phy_read(phydev, LAN88XX_EXT_MODE_CTRL);
 298         buf &= ~LAN88XX_EXT_MODE_CTRL_MDIX_MASK_;
 299         buf |= val;
 300         phy_write(phydev, LAN88XX_EXT_MODE_CTRL, buf);
 301         phy_write(phydev, LAN88XX_EXT_PAGE_ACCESS, LAN88XX_EXT_PAGE_SPACE_0);
 302 }
 303
 304 static int lan88xx_config_init(struct phy_device *phydev)
 305 {
 306         int val;
 307
 308         genphy_config_init(phydev);
 309         /*Zerodetect delay enable */
 310         val = phy_read_mmd(phydev, MDIO_MMD_PCS,
 311                            PHY_ARDENNES_MMD_DEV_3_PHY_CFG);
 312         val |= PHY_ARDENNES_MMD_DEV_3_PHY_CFG_ZD_DLY_EN_;
 313
 314         phy_write_mmd(phydev, MDIO_MMD_PCS, PHY_ARDENNES_MMD_DEV_3_PHY_CFG,
 315                       val);
 316
 317         /* Config DSP registers */
 318         lan88xx_config_TR_regs(phydev);
 319
 320         return 0;
 321 }
 322
 323 static int lan88xx_config_aneg(struct phy_device *phydev)
 324 {
 325         lan88xx_set_mdix(phydev);
 326
 327         return genphy_config_aneg(phydev);
 328 }
 329
 330 static struct phy_driver microchip_phy_driver[] = {
 331 {
 332         .phy_id         = 0x0007c130,
 333         .phy_id_mask    = 0xfffffff0,
 334         .name           = "Microchip LAN88xx",
 335
 336         /* PHY_GBIT_FEATURES */
 337
 338         .probe          = lan88xx_probe,
 339         .remove         = lan88xx_remove,
 340
 341         .config_init    = lan88xx_config_init,
 342         .config_aneg    = lan88xx_config_aneg,
 343
 344         .ack_interrupt  = lan88xx_phy_ack_interrupt,
 345         .config_intr    = lan88xx_phy_config_intr,
 346
 347         .suspend        = lan88xx_suspend,
 348         .resume         = genphy_resume,
 349         .set_wol        = lan88xx_set_wol,
 350         .read_page      = lan88xx_read_page,
 351         .write_page     = lan88xx_write_page,
 352 } };
 353
 354 module_phy_driver(microchip_phy_driver);
 355
 356 static struct mdio_device_id __maybe_unused microchip_tbl[] = {
 357         { 0x0007c130, 0xfffffff0 },
 358         { }
 359 };
 360
 361 MODULE_DEVICE_TABLE(mdio, microchip_tbl);
 362
 363 MODULE_AUTHOR(DRIVER_AUTHOR);
 364 MODULE_DESCRIPTION(DRIVER_DESC);
 365 MODULE_LICENSE("GPL");