drivers/net/phy/dp83867.c

   1 /*
   2  * Driver for the Texas Instruments DP83867 PHY
   3  *
   4  * Copyright (C) 2015 Texas Instruments Inc.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  */
  15
  16 #include <linux/ethtool.h>
  17 #include <linux/kernel.h>
  18 #include <linux/mii.h>
  19 #include <linux/module.h>
  20 #include <linux/of.h>
  21 #include <linux/phy.h>
  22
  23 #include <dt-bindings/net/ti-dp83867.h>
  24
  25 #define DP83867_PHY_ID          0x2000a231
  26 #define DP83867_DEVADDR         0x1f
  27
  28 #define MII_DP83867_PHYCTRL     0x10
  29 #define MII_DP83867_MICR        0x12
  30 #define MII_DP83867_ISR         0x13
  31 #define DP83867_CTRL            0x1f
  32
  33 /* Extended Registers */
  34 #define DP83867_RGMIICTL        0x0032
  35 #define DP83867_RGMIIDCTL       0x0086
  36
  37 #define DP83867_SW_RESET        BIT(15)
  38 #define DP83867_SW_RESTART      BIT(14)
  39
  40 /* MICR Interrupt bits */
  41 #define MII_DP83867_MICR_AN_ERR_INT_EN          BIT(15)
  42 #define MII_DP83867_MICR_SPEED_CHNG_INT_EN      BIT(14)
  43 #define MII_DP83867_MICR_DUP_MODE_CHNG_INT_EN   BIT(13)
  44 #define MII_DP83867_MICR_PAGE_RXD_INT_EN        BIT(12)
  45 #define MII_DP83867_MICR_AUTONEG_COMP_INT_EN    BIT(11)
  46 #define MII_DP83867_MICR_LINK_STS_CHNG_INT_EN   BIT(10)
  47 #define MII_DP83867_MICR_FALSE_CARRIER_INT_EN   BIT(8)
  48 #define MII_DP83867_MICR_SLEEP_MODE_CHNG_INT_EN BIT(4)
  49 #define MII_DP83867_MICR_WOL_INT_EN             BIT(3)
  50 #define MII_DP83867_MICR_XGMII_ERR_INT_EN       BIT(2)
  51 #define MII_DP83867_MICR_POL_CHNG_INT_EN        BIT(1)
  52 #define MII_DP83867_MICR_JABBER_INT_EN          BIT(0)
  53
  54 /* RGMIICTL bits */
  55 #define DP83867_RGMII_TX_CLK_DELAY_EN           BIT(1)
  56 #define DP83867_RGMII_RX_CLK_DELAY_EN           BIT(0)
  57
  58 /* PHY CTRL bits */
  59 #define DP83867_PHYCR_FIFO_DEPTH_SHIFT          14
  60
  61 /* RGMIIDCTL bits */
  62 #define DP83867_RGMII_TX_CLK_DELAY_SHIFT        4
  63
  64 struct dp83867_private {
  65         int rx_id_delay;
  66         int tx_id_delay;
  67         int fifo_depth;
  68 };
  69
  70 static int dp83867_ack_interrupt(struct phy_device *phydev)
  71 {
  72         int err = phy_read(phydev, MII_DP83867_ISR);
  73
  74         if (err < 0)
  75                 return err;
  76
  77         return 0;
  78 }
  79
  80 static int dp83867_config_intr(struct phy_device *phydev)
  81 {
  82         int micr_status;
  83
  84         if (phydev->interrupts == PHY_INTERRUPT_ENABLED) {
  85                 micr_status = phy_read(phydev, MII_DP83867_MICR);
  86                 if (micr_status < 0)
  87                         return micr_status;
  88
  89                 micr_status |=
  90                         (MII_DP83867_MICR_AN_ERR_INT_EN |
  91                         MII_DP83867_MICR_SPEED_CHNG_INT_EN |
  92                         MII_DP83867_MICR_DUP_MODE_CHNG_INT_EN |
  93                         MII_DP83867_MICR_SLEEP_MODE_CHNG_INT_EN);
  94
  95                 return phy_write(phydev, MII_DP83867_MICR, micr_status);
  96         }
  97
  98         micr_status = 0x0;
  99         return phy_write(phydev, MII_DP83867_MICR, micr_status);
 100 }
 101
 102 #ifdef CONFIG_OF_MDIO
 103 static int dp83867_of_init(struct phy_device *phydev)
 104 {
 105         struct dp83867_private *dp83867 = phydev->priv;
 106         struct device *dev = &phydev->mdio.dev;
 107         struct device_node *of_node = dev->of_node;
 108         int ret;
 109
 110         if (!of_node)
 111                 return -ENODEV;
 112
 113         ret = of_property_read_u32(of_node, "ti,rx-internal-delay",
 114                                    &dp83867->rx_id_delay);
 115         if (ret)
 116                 return ret;
 117
 118         ret = of_property_read_u32(of_node, "ti,tx-internal-delay",
 119                                    &dp83867->tx_id_delay);
 120         if (ret)
 121                 return ret;
 122
 123         return of_property_read_u32(of_node, "ti,fifo-depth",
 124                                    &dp83867->fifo_depth);
 125 }
 126 #else
 127 static int dp83867_of_init(struct phy_device *phydev)
 128 {
 129         return 0;
 130 }
 131 #endif /* CONFIG_OF_MDIO */
 132
 133 static int dp83867_config_init(struct phy_device *phydev)
 134 {
 135         struct dp83867_private *dp83867;
 136         int ret;
 137         u16 val, delay;
 138
 139         if (!phydev->priv) {
 140                 dp83867 = devm_kzalloc(&phydev->mdio.dev, sizeof(*dp83867),
 141                                        GFP_KERNEL);
 142                 if (!dp83867)
 143                         return -ENOMEM;
 144
 145                 phydev->priv = dp83867;
 146                 ret = dp83867_of_init(phydev);
 147                 if (ret)
 148                         return ret;
 149         } else {
 150                 dp83867 = (struct dp83867_private *)phydev->priv;
 151         }
 152
 153         if (phy_interface_is_rgmii(phydev)) {
 154                 ret = phy_write(phydev, MII_DP83867_PHYCTRL,
 155                         (dp83867->fifo_depth << DP83867_PHYCR_FIFO_DEPTH_SHIFT));
 156                 if (ret)
 157                         return ret;
 158         }
 159
 160         if ((phydev->interface >= PHY_INTERFACE_MODE_RGMII_ID) &&
 161             (phydev->interface <= PHY_INTERFACE_MODE_RGMII_RXID)) {
 162                 val = phy_read_mmd_indirect(phydev, DP83867_RGMIICTL,
 163                                             DP83867_DEVADDR);
 164
 165                 if (phydev->interface == PHY_INTERFACE_MODE_RGMII_ID)
 166                         val |= (DP83867_RGMII_TX_CLK_DELAY_EN | DP83867_RGMII_RX_CLK_DELAY_EN);
 167
 168                 if (phydev->interface == PHY_INTERFACE_MODE_RGMII_TXID)
 169                         val |= DP83867_RGMII_TX_CLK_DELAY_EN;
 170
 171                 if (phydev->interface == PHY_INTERFACE_MODE_RGMII_RXID)
 172                         val |= DP83867_RGMII_RX_CLK_DELAY_EN;
 173
 174                 phy_write_mmd_indirect(phydev, DP83867_RGMIICTL,
 175                                        DP83867_DEVADDR, val);
 176
 177                 delay = (dp83867->rx_id_delay |
 178                         (dp83867->tx_id_delay << DP83867_RGMII_TX_CLK_DELAY_SHIFT));
 179
 180                 phy_write_mmd_indirect(phydev, DP83867_RGMIIDCTL,
 181                                        DP83867_DEVADDR, delay);
 182         }
 183
 184         return 0;
 185 }
 186
 187 static int dp83867_phy_reset(struct phy_device *phydev)
 188 {
 189         int err;
 190
 191         err = phy_write(phydev, DP83867_CTRL, DP83867_SW_RESET);
 192         if (err < 0)
 193                 return err;
 194
 195         return dp83867_config_init(phydev);
 196 }
 197
 198 static struct phy_driver dp83867_driver[] = {
 199         {
 200                 .phy_id         = DP83867_PHY_ID,
 201                 .phy_id_mask    = 0xfffffff0,
 202                 .name           = "TI DP83867",
 203                 .features       = PHY_GBIT_FEATURES,
 204                 .flags          = PHY_HAS_INTERRUPT,
 205
 206                 .config_init    = dp83867_config_init,
 207                 .soft_reset     = dp83867_phy_reset,
 208
 209                 /* IRQ related */
 210                 .ack_interrupt  = dp83867_ack_interrupt,
 211                 .config_intr    = dp83867_config_intr,
 212
 213                 .config_aneg    = genphy_config_aneg,
 214                 .read_status    = genphy_read_status,
 215                 .suspend        = genphy_suspend,
 216                 .resume         = genphy_resume,
 217         },
 218 };
 219 module_phy_driver(dp83867_driver);
 220
 221 static struct mdio_device_id __maybe_unused dp83867_tbl[] = {
 222         { DP83867_PHY_ID, 0xfffffff0 },
 223         { }
 224 };
 225
 226 MODULE_DEVICE_TABLE(mdio, dp83867_tbl);
 227
 228 MODULE_DESCRIPTION("Texas Instruments DP83867 PHY driver");
 229 MODULE_AUTHOR("Dan Murphy <dmurphy@ti.com");
 230 MODULE_LICENSE("GPL");