kernel/drivers/net/phy/at803x.c

   1 /*
   2  * drivers/net/phy/at803x.c
   3  *
   4  * Driver for Atheros 803x PHY
   5  *
   6  * Author: Matus Ujhelyi <ujhelyi.m@gmail.com>
   7  *
   8  * This program is free software; you can redistribute  it and/or modify it
   9  * under  the terms of  the GNU General  Public License as published by the
  10  * Free Software Foundation;  either version 2 of the  License, or (at your
  11  * option) any later version.
  12  */
  13
  14 #include <linux/phy.h>
  15 #include <linux/module.h>
  16 #include <linux/string.h>
  17 #include <linux/netdevice.h>
  18 #include <linux/etherdevice.h>
  19 #include <linux/of_gpio.h>
  20 #include <linux/gpio/consumer.h>
  21
  22 #define AT803X_INTR_ENABLE                      0x12
  23 #define AT803X_INTR_STATUS                      0x13
  24 #define AT803X_SMART_SPEED                      0x14
  25 #define AT803X_LED_CONTROL                      0x18
  26 #define AT803X_WOL_ENABLE                       0x01
  27 #define AT803X_DEVICE_ADDR                      0x03
  28 #define AT803X_LOC_MAC_ADDR_0_15_OFFSET         0x804C
  29 #define AT803X_LOC_MAC_ADDR_16_31_OFFSET        0x804B
  30 #define AT803X_LOC_MAC_ADDR_32_47_OFFSET        0x804A
  31 #define AT803X_MMD_ACCESS_CONTROL               0x0D
  32 #define AT803X_MMD_ACCESS_CONTROL_DATA          0x0E
  33 #define AT803X_FUNC_DATA                        0x4003
  34 #define AT803X_INER                             0x0012
  35 #define AT803X_INER_INIT                        0xec00
  36 #define AT803X_INSR                             0x0013
  37 #define AT803X_DEBUG_ADDR                       0x1D
  38 #define AT803X_DEBUG_DATA                       0x1E
  39 #define AT803X_DEBUG_SYSTEM_MODE_CTRL           0x05
  40 #define AT803X_DEBUG_RGMII_TX_CLK_DLY           BIT(8)
  41
  42 #define ATH8030_PHY_ID 0x004dd076
  43 #define ATH8031_PHY_ID 0x004dd074
  44 #define ATH8035_PHY_ID 0x004dd072
  45
  46 MODULE_DESCRIPTION("Atheros 803x PHY driver");
  47 MODULE_AUTHOR("Matus Ujhelyi");
  48 MODULE_LICENSE("GPL");
  49
  50 struct at803x_priv {
  51         bool phy_reset:1;
  52         struct gpio_desc *gpiod_reset;
  53 };
  54
  55 struct at803x_context {
  56         u16 bmcr;
  57         u16 advertise;
  58         u16 control1000;
  59         u16 int_enable;
  60         u16 smart_speed;
  61         u16 led_control;
  62 };
  63
  64 /* save relevant PHY registers to private copy */
  65 static void at803x_context_save(struct phy_device *phydev,
  66                                 struct at803x_context *context)
  67 {
  68         context->bmcr = phy_read(phydev, MII_BMCR);
  69         context->advertise = phy_read(phydev, MII_ADVERTISE);
  70         context->control1000 = phy_read(phydev, MII_CTRL1000);
  71         context->int_enable = phy_read(phydev, AT803X_INTR_ENABLE);
  72         context->smart_speed = phy_read(phydev, AT803X_SMART_SPEED);
  73         context->led_control = phy_read(phydev, AT803X_LED_CONTROL);
  74 }
  75
  76 /* restore relevant PHY registers from private copy */
  77 static void at803x_context_restore(struct phy_device *phydev,
  78                                    const struct at803x_context *context)
  79 {
  80         phy_write(phydev, MII_BMCR, context->bmcr);
  81         phy_write(phydev, MII_ADVERTISE, context->advertise);
  82         phy_write(phydev, MII_CTRL1000, context->control1000);
  83         phy_write(phydev, AT803X_INTR_ENABLE, context->int_enable);
  84         phy_write(phydev, AT803X_SMART_SPEED, context->smart_speed);
  85         phy_write(phydev, AT803X_LED_CONTROL, context->led_control);
  86 }
  87
  88 static int at803x_set_wol(struct phy_device *phydev,
  89                           struct ethtool_wolinfo *wol)
  90 {
  91         struct net_device *ndev = phydev->attached_dev;
  92         const u8 *mac;
  93         int ret;
  94         u32 value;
  95         unsigned int i, offsets[] = {
  96                 AT803X_LOC_MAC_ADDR_32_47_OFFSET,
  97                 AT803X_LOC_MAC_ADDR_16_31_OFFSET,
  98                 AT803X_LOC_MAC_ADDR_0_15_OFFSET,
  99         };
 100
 101         if (!ndev)
 102                 return -ENODEV;
 103
 104         if (wol->wolopts & WAKE_MAGIC) {
 105                 mac = (const u8 *) ndev->dev_addr;
 106
 107                 if (!is_valid_ether_addr(mac))
 108                         return -EFAULT;
 109
 110                 for (i = 0; i < 3; i++) {
 111                         phy_write(phydev, AT803X_MMD_ACCESS_CONTROL,
 112                                   AT803X_DEVICE_ADDR);
 113                         phy_write(phydev, AT803X_MMD_ACCESS_CONTROL_DATA,
 114                                   offsets[i]);
 115                         phy_write(phydev, AT803X_MMD_ACCESS_CONTROL,
 116                                   AT803X_FUNC_DATA);
 117                         phy_write(phydev, AT803X_MMD_ACCESS_CONTROL_DATA,
 118                                   mac[(i * 2) + 1] | (mac[(i * 2)] << 8));
 119                 }
 120
 121                 value = phy_read(phydev, AT803X_INTR_ENABLE);
 122                 value |= AT803X_WOL_ENABLE;
 123                 ret = phy_write(phydev, AT803X_INTR_ENABLE, value);
 124                 if (ret)
 125                         return ret;
 126                 value = phy_read(phydev, AT803X_INTR_STATUS);
 127         } else {
 128                 value = phy_read(phydev, AT803X_INTR_ENABLE);
 129                 value &= (~AT803X_WOL_ENABLE);
 130                 ret = phy_write(phydev, AT803X_INTR_ENABLE, value);
 131                 if (ret)
 132                         return ret;
 133                 value = phy_read(phydev, AT803X_INTR_STATUS);
 134         }
 135
 136         return ret;
 137 }
 138
 139 static void at803x_get_wol(struct phy_device *phydev,
 140                            struct ethtool_wolinfo *wol)
 141 {
 142         u32 value;
 143
 144         wol->supported = WAKE_MAGIC;
 145         wol->wolopts = 0;
 146
 147         value = phy_read(phydev, AT803X_INTR_ENABLE);
 148         if (value & AT803X_WOL_ENABLE)
 149                 wol->wolopts |= WAKE_MAGIC;
 150 }
 151
 152 static int at803x_suspend(struct phy_device *phydev)
 153 {
 154         int value;
 155         int wol_enabled;
 156
 157         mutex_lock(&phydev->lock);
 158
 159         value = phy_read(phydev, AT803X_INTR_ENABLE);
 160         wol_enabled = value & AT803X_WOL_ENABLE;
 161
 162         value = phy_read(phydev, MII_BMCR);
 163
 164         if (wol_enabled)
 165                 value |= BMCR_ISOLATE;
 166         else
 167                 value |= BMCR_PDOWN;
 168
 169         phy_write(phydev, MII_BMCR, value);
 170
 171         mutex_unlock(&phydev->lock);
 172
 173         return 0;
 174 }
 175
 176 static int at803x_resume(struct phy_device *phydev)
 177 {
 178         int value;
 179
 180         mutex_lock(&phydev->lock);
 181
 182         value = phy_read(phydev, MII_BMCR);
 183         value &= ~(BMCR_PDOWN | BMCR_ISOLATE);
 184         phy_write(phydev, MII_BMCR, value);
 185
 186         mutex_unlock(&phydev->lock);
 187
 188         return 0;
 189 }
 190
 191 static int at803x_probe(struct phy_device *phydev)
 192 {
 193         struct device *dev = &phydev->dev;
 194         struct at803x_priv *priv;
 195         struct gpio_desc *gpiod_reset;
 196
 197         priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
 198         if (!priv)
 199                 return -ENOMEM;
 200
 201         gpiod_reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
 202         if (IS_ERR(gpiod_reset))
 203                 return PTR_ERR(gpiod_reset);
 204
 205         priv->gpiod_reset = gpiod_reset;
 206
 207         phydev->priv = priv;
 208
 209         return 0;
 210 }
 211
 212 static int at803x_config_init(struct phy_device *phydev)
 213 {
 214         int ret;
 215
 216         ret = genphy_config_init(phydev);
 217         if (ret < 0)
 218                 return ret;
 219
 220         if (phydev->interface == PHY_INTERFACE_MODE_RGMII_TXID) {
 221                 ret = phy_write(phydev, AT803X_DEBUG_ADDR,
 222                                 AT803X_DEBUG_SYSTEM_MODE_CTRL);
 223                 if (ret)
 224                         return ret;
 225                 ret = phy_write(phydev, AT803X_DEBUG_DATA,
 226                                 AT803X_DEBUG_RGMII_TX_CLK_DLY);
 227                 if (ret)
 228                         return ret;
 229         }
 230
 231         return 0;
 232 }
 233
 234 static int at803x_ack_interrupt(struct phy_device *phydev)
 235 {
 236         int err;
 237
 238         err = phy_read(phydev, AT803X_INSR);
 239
 240         return (err < 0) ? err : 0;
 241 }
 242
 243 static int at803x_config_intr(struct phy_device *phydev)
 244 {
 245         int err;
 246         int value;
 247
 248         value = phy_read(phydev, AT803X_INER);
 249
 250         if (phydev->interrupts == PHY_INTERRUPT_ENABLED)
 251                 err = phy_write(phydev, AT803X_INER,
 252                                 value | AT803X_INER_INIT);
 253         else
 254                 err = phy_write(phydev, AT803X_INER, 0);
 255
 256         return err;
 257 }
 258
 259 static void at803x_link_change_notify(struct phy_device *phydev)
 260 {
 261         struct at803x_priv *priv = phydev->priv;
 262
 263         /*
 264          * Conduct a hardware reset for AT8030 every time a link loss is
 265          * signalled. This is necessary to circumvent a hardware bug that
 266          * occurs when the cable is unplugged while TX packets are pending
 267          * in the FIFO. In such cases, the FIFO enters an error mode it
 268          * cannot recover from by software.
 269          */
 270         if (phydev->drv->phy_id == ATH8030_PHY_ID) {
 271                 if (phydev->state == PHY_NOLINK) {
 272                         if (priv->gpiod_reset && !priv->phy_reset) {
 273                                 struct at803x_context context;
 274
 275                                 at803x_context_save(phydev, &context);
 276
 277                                 gpiod_set_value(priv->gpiod_reset, 0);
 278                                 msleep(1);
 279                                 gpiod_set_value(priv->gpiod_reset, 1);
 280                                 msleep(1);
 281
 282                                 at803x_context_restore(phydev, &context);
 283
 284                                 dev_dbg(&phydev->dev, "%s(): phy was reset\n",
 285                                         __func__);
 286                                 priv->phy_reset = true;
 287                         }
 288                 } else {
 289                         priv->phy_reset = false;
 290                 }
 291         }
 292 }
 293
 294 static struct phy_driver at803x_driver[] = {
 295 {
 296         /* ATHEROS 8035 */
 297         .phy_id                 = ATH8035_PHY_ID,
 298         .name                   = "Atheros 8035 ethernet",
 299         .phy_id_mask            = 0xffffffef,
 300         .probe                  = at803x_probe,
 301         .config_init            = at803x_config_init,
 302         .link_change_notify     = at803x_link_change_notify,
 303         .set_wol                = at803x_set_wol,
 304         .get_wol                = at803x_get_wol,
 305         .suspend                = at803x_suspend,
 306         .resume                 = at803x_resume,
 307         .features               = PHY_GBIT_FEATURES,
 308         .flags                  = PHY_HAS_INTERRUPT,
 309         .config_aneg            = genphy_config_aneg,
 310         .read_status            = genphy_read_status,
 311         .driver                 = {
 312                 .owner = THIS_MODULE,
 313         },
 314 }, {
 315         /* ATHEROS 8030 */
 316         .phy_id                 = ATH8030_PHY_ID,
 317         .name                   = "Atheros 8030 ethernet",
 318         .phy_id_mask            = 0xffffffef,
 319         .probe                  = at803x_probe,
 320         .config_init            = at803x_config_init,
 321         .link_change_notify     = at803x_link_change_notify,
 322         .set_wol                = at803x_set_wol,
 323         .get_wol                = at803x_get_wol,
 324         .suspend                = at803x_suspend,
 325         .resume                 = at803x_resume,
 326         .features               = PHY_GBIT_FEATURES,
 327         .flags                  = PHY_HAS_INTERRUPT,
 328         .config_aneg            = genphy_config_aneg,
 329         .read_status            = genphy_read_status,
 330         .driver                 = {
 331                 .owner = THIS_MODULE,
 332         },
 333 }, {
 334         /* ATHEROS 8031 */
 335         .phy_id                 = ATH8031_PHY_ID,
 336         .name                   = "Atheros 8031 ethernet",
 337         .phy_id_mask            = 0xffffffef,
 338         .probe                  = at803x_probe,
 339         .config_init            = at803x_config_init,
 340         .link_change_notify     = at803x_link_change_notify,
 341         .set_wol                = at803x_set_wol,
 342         .get_wol                = at803x_get_wol,
 343         .suspend                = at803x_suspend,
 344         .resume                 = at803x_resume,
 345         .features               = PHY_GBIT_FEATURES,
 346         .flags                  = PHY_HAS_INTERRUPT,
 347         .config_aneg            = genphy_config_aneg,
 348         .read_status            = genphy_read_status,
 349         .ack_interrupt          = &at803x_ack_interrupt,
 350         .config_intr            = &at803x_config_intr,
 351         .driver                 = {
 352                 .owner = THIS_MODULE,
 353         },
 354 } };
 355
 356 module_phy_driver(at803x_driver);
 357
 358 static struct mdio_device_id __maybe_unused atheros_tbl[] = {
 359         { ATH8030_PHY_ID, 0xffffffef },
 360         { ATH8031_PHY_ID, 0xffffffef },
 361         { ATH8035_PHY_ID, 0xffffffef },
 362         { }
 363 };
 364
 365 MODULE_DEVICE_TABLE(mdio, atheros_tbl);