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 #define DP83867_CFG3 0x1e 33 34 /* Extended Registers */ 35 #define DP83867_CFG4 0x0031 36 #define DP83867_RGMIICTL 0x0032 37 #define DP83867_STRAP_STS1 0x006E 38 #define DP83867_RGMIIDCTL 0x0086 39 #define DP83867_IO_MUX_CFG 0x0170 40 41 #define DP83867_SW_RESET BIT(15) 42 #define DP83867_SW_RESTART BIT(14) 43 44 /* MICR Interrupt bits */ 45 #define MII_DP83867_MICR_AN_ERR_INT_EN BIT(15) 46 #define MII_DP83867_MICR_SPEED_CHNG_INT_EN BIT(14) 47 #define MII_DP83867_MICR_DUP_MODE_CHNG_INT_EN BIT(13) 48 #define MII_DP83867_MICR_PAGE_RXD_INT_EN BIT(12) 49 #define MII_DP83867_MICR_AUTONEG_COMP_INT_EN BIT(11) 50 #define MII_DP83867_MICR_LINK_STS_CHNG_INT_EN BIT(10) 51 #define MII_DP83867_MICR_FALSE_CARRIER_INT_EN BIT(8) 52 #define MII_DP83867_MICR_SLEEP_MODE_CHNG_INT_EN BIT(4) 53 #define MII_DP83867_MICR_WOL_INT_EN BIT(3) 54 #define MII_DP83867_MICR_XGMII_ERR_INT_EN BIT(2) 55 #define MII_DP83867_MICR_POL_CHNG_INT_EN BIT(1) 56 #define MII_DP83867_MICR_JABBER_INT_EN BIT(0) 57 58 /* RGMIICTL bits */ 59 #define DP83867_RGMII_TX_CLK_DELAY_EN BIT(1) 60 #define DP83867_RGMII_RX_CLK_DELAY_EN BIT(0) 61 62 /* STRAP_STS1 bits */ 63 #define DP83867_STRAP_STS1_RESERVED BIT(11) 64 65 /* PHY CTRL bits */ 66 #define DP83867_PHYCR_FIFO_DEPTH_SHIFT 14 67 #define DP83867_PHYCR_FIFO_DEPTH_MASK (3 << 14) 68 #define DP83867_PHYCR_RESERVED_MASK BIT(11) 69 70 /* RGMIIDCTL bits */ 71 #define DP83867_RGMII_TX_CLK_DELAY_SHIFT 4 72 73 /* IO_MUX_CFG bits */ 74 #define DP83867_IO_MUX_CFG_IO_IMPEDANCE_CTRL 0x1f 75 76 #define DP83867_IO_MUX_CFG_IO_IMPEDANCE_MAX 0x0 77 #define DP83867_IO_MUX_CFG_IO_IMPEDANCE_MIN 0x1f 78 #define DP83867_IO_MUX_CFG_CLK_O_SEL_MASK (0x1f << 8) 79 #define DP83867_IO_MUX_CFG_CLK_O_SEL_SHIFT 8 80 81 /* CFG4 bits */ 82 #define DP83867_CFG4_PORT_MIRROR_EN BIT(0) 83 84 enum { 85 DP83867_PORT_MIRROING_KEEP, 86 DP83867_PORT_MIRROING_EN, 87 DP83867_PORT_MIRROING_DIS, 88 }; 89 90 struct dp83867_private { 91 int rx_id_delay; 92 int tx_id_delay; 93 int fifo_depth; 94 int io_impedance; 95 int port_mirroring; 96 bool rxctrl_strap_quirk; 97 int clk_output_sel; 98 }; 99 100 static int dp83867_ack_interrupt(struct phy_device *phydev) 101 { 102 int err = phy_read(phydev, MII_DP83867_ISR); 103 104 if (err < 0) 105 return err; 106 107 return 0; 108 } 109 110 static int dp83867_config_intr(struct phy_device *phydev) 111 { 112 int micr_status; 113 114 if (phydev->interrupts == PHY_INTERRUPT_ENABLED) { 115 micr_status = phy_read(phydev, MII_DP83867_MICR); 116 if (micr_status < 0) 117 return micr_status; 118 119 micr_status |= 120 (MII_DP83867_MICR_AN_ERR_INT_EN | 121 MII_DP83867_MICR_SPEED_CHNG_INT_EN | 122 MII_DP83867_MICR_AUTONEG_COMP_INT_EN | 123 MII_DP83867_MICR_LINK_STS_CHNG_INT_EN | 124 MII_DP83867_MICR_DUP_MODE_CHNG_INT_EN | 125 MII_DP83867_MICR_SLEEP_MODE_CHNG_INT_EN); 126 127 return phy_write(phydev, MII_DP83867_MICR, micr_status); 128 } 129 130 micr_status = 0x0; 131 return phy_write(phydev, MII_DP83867_MICR, micr_status); 132 } 133 134 static int dp83867_config_port_mirroring(struct phy_device *phydev) 135 { 136 struct dp83867_private *dp83867 = 137 (struct dp83867_private *)phydev->priv; 138 u16 val; 139 140 val = phy_read_mmd(phydev, DP83867_DEVADDR, DP83867_CFG4); 141 142 if (dp83867->port_mirroring == DP83867_PORT_MIRROING_EN) 143 val |= DP83867_CFG4_PORT_MIRROR_EN; 144 else 145 val &= ~DP83867_CFG4_PORT_MIRROR_EN; 146 147 phy_write_mmd(phydev, DP83867_DEVADDR, DP83867_CFG4, val); 148 149 return 0; 150 } 151 152 #ifdef CONFIG_OF_MDIO 153 static int dp83867_of_init(struct phy_device *phydev) 154 { 155 struct dp83867_private *dp83867 = phydev->priv; 156 struct device *dev = &phydev->mdio.dev; 157 struct device_node *of_node = dev->of_node; 158 int ret; 159 160 if (!of_node) 161 return -ENODEV; 162 163 dp83867->io_impedance = -EINVAL; 164 165 /* Optional configuration */ 166 ret = of_property_read_u32(of_node, "ti,clk-output-sel", 167 &dp83867->clk_output_sel); 168 if (ret || dp83867->clk_output_sel > DP83867_CLK_O_SEL_REF_CLK) 169 /* Keep the default value if ti,clk-output-sel is not set 170 * or too high 171 */ 172 dp83867->clk_output_sel = DP83867_CLK_O_SEL_REF_CLK; 173 174 if (of_property_read_bool(of_node, "ti,max-output-impedance")) 175 dp83867->io_impedance = DP83867_IO_MUX_CFG_IO_IMPEDANCE_MAX; 176 else if (of_property_read_bool(of_node, "ti,min-output-impedance")) 177 dp83867->io_impedance = DP83867_IO_MUX_CFG_IO_IMPEDANCE_MIN; 178 179 dp83867->rxctrl_strap_quirk = of_property_read_bool(of_node, 180 "ti,dp83867-rxctrl-strap-quirk"); 181 182 ret = of_property_read_u32(of_node, "ti,rx-internal-delay", 183 &dp83867->rx_id_delay); 184 if (ret && 185 (phydev->interface == PHY_INTERFACE_MODE_RGMII_ID || 186 phydev->interface == PHY_INTERFACE_MODE_RGMII_RXID)) 187 return ret; 188 189 ret = of_property_read_u32(of_node, "ti,tx-internal-delay", 190 &dp83867->tx_id_delay); 191 if (ret && 192 (phydev->interface == PHY_INTERFACE_MODE_RGMII_ID || 193 phydev->interface == PHY_INTERFACE_MODE_RGMII_TXID)) 194 return ret; 195 196 if (of_property_read_bool(of_node, "enet-phy-lane-swap")) 197 dp83867->port_mirroring = DP83867_PORT_MIRROING_EN; 198 199 if (of_property_read_bool(of_node, "enet-phy-lane-no-swap")) 200 dp83867->port_mirroring = DP83867_PORT_MIRROING_DIS; 201 202 return of_property_read_u32(of_node, "ti,fifo-depth", 203 &dp83867->fifo_depth); 204 } 205 #else 206 static int dp83867_of_init(struct phy_device *phydev) 207 { 208 return 0; 209 } 210 #endif /* CONFIG_OF_MDIO */ 211 212 static int dp83867_config_init(struct phy_device *phydev) 213 { 214 struct dp83867_private *dp83867; 215 int ret, val, bs; 216 u16 delay; 217 218 if (!phydev->priv) { 219 dp83867 = devm_kzalloc(&phydev->mdio.dev, sizeof(*dp83867), 220 GFP_KERNEL); 221 if (!dp83867) 222 return -ENOMEM; 223 224 phydev->priv = dp83867; 225 ret = dp83867_of_init(phydev); 226 if (ret) 227 return ret; 228 } else { 229 dp83867 = (struct dp83867_private *)phydev->priv; 230 } 231 232 /* RX_DV/RX_CTRL strapped in mode 1 or mode 2 workaround */ 233 if (dp83867->rxctrl_strap_quirk) { 234 val = phy_read_mmd(phydev, DP83867_DEVADDR, DP83867_CFG4); 235 val &= ~BIT(7); 236 phy_write_mmd(phydev, DP83867_DEVADDR, DP83867_CFG4, val); 237 } 238 239 if (phy_interface_is_rgmii(phydev)) { 240 val = phy_read(phydev, MII_DP83867_PHYCTRL); 241 if (val < 0) 242 return val; 243 val &= ~DP83867_PHYCR_FIFO_DEPTH_MASK; 244 val |= (dp83867->fifo_depth << DP83867_PHYCR_FIFO_DEPTH_SHIFT); 245 246 /* The code below checks if "port mirroring" N/A MODE4 has been 247 * enabled during power on bootstrap. 248 * 249 * Such N/A mode enabled by mistake can put PHY IC in some 250 * internal testing mode and disable RGMII transmission. 251 * 252 * In this particular case one needs to check STRAP_STS1 253 * register's bit 11 (marked as RESERVED). 254 */ 255 256 bs = phy_read_mmd(phydev, DP83867_DEVADDR, DP83867_STRAP_STS1); 257 if (bs & DP83867_STRAP_STS1_RESERVED) 258 val &= ~DP83867_PHYCR_RESERVED_MASK; 259 260 ret = phy_write(phydev, MII_DP83867_PHYCTRL, val); 261 if (ret) 262 return ret; 263 } 264 265 if ((phydev->interface >= PHY_INTERFACE_MODE_RGMII_ID) && 266 (phydev->interface <= PHY_INTERFACE_MODE_RGMII_RXID)) { 267 val = phy_read_mmd(phydev, DP83867_DEVADDR, DP83867_RGMIICTL); 268 269 if (phydev->interface == PHY_INTERFACE_MODE_RGMII_ID) 270 val |= (DP83867_RGMII_TX_CLK_DELAY_EN | DP83867_RGMII_RX_CLK_DELAY_EN); 271 272 if (phydev->interface == PHY_INTERFACE_MODE_RGMII_TXID) 273 val |= DP83867_RGMII_TX_CLK_DELAY_EN; 274 275 if (phydev->interface == PHY_INTERFACE_MODE_RGMII_RXID) 276 val |= DP83867_RGMII_RX_CLK_DELAY_EN; 277 278 phy_write_mmd(phydev, DP83867_DEVADDR, DP83867_RGMIICTL, val); 279 280 delay = (dp83867->rx_id_delay | 281 (dp83867->tx_id_delay << DP83867_RGMII_TX_CLK_DELAY_SHIFT)); 282 283 phy_write_mmd(phydev, DP83867_DEVADDR, DP83867_RGMIIDCTL, 284 delay); 285 286 if (dp83867->io_impedance >= 0) { 287 val = phy_read_mmd(phydev, DP83867_DEVADDR, 288 DP83867_IO_MUX_CFG); 289 290 val &= ~DP83867_IO_MUX_CFG_IO_IMPEDANCE_CTRL; 291 val |= dp83867->io_impedance & 292 DP83867_IO_MUX_CFG_IO_IMPEDANCE_CTRL; 293 294 phy_write_mmd(phydev, DP83867_DEVADDR, 295 DP83867_IO_MUX_CFG, val); 296 } 297 } 298 299 /* Enable Interrupt output INT_OE in CFG3 register */ 300 if (phy_interrupt_is_valid(phydev)) { 301 val = phy_read(phydev, DP83867_CFG3); 302 val |= BIT(7); 303 phy_write(phydev, DP83867_CFG3, val); 304 } 305 306 if (dp83867->port_mirroring != DP83867_PORT_MIRROING_KEEP) 307 dp83867_config_port_mirroring(phydev); 308 309 /* Clock output selection if muxing property is set */ 310 if (dp83867->clk_output_sel != DP83867_CLK_O_SEL_REF_CLK) { 311 val = phy_read_mmd(phydev, DP83867_DEVADDR, DP83867_IO_MUX_CFG); 312 val &= ~DP83867_IO_MUX_CFG_CLK_O_SEL_MASK; 313 val |= (dp83867->clk_output_sel << DP83867_IO_MUX_CFG_CLK_O_SEL_SHIFT); 314 phy_write_mmd(phydev, DP83867_DEVADDR, DP83867_IO_MUX_CFG, val); 315 } 316 317 return 0; 318 } 319 320 static int dp83867_phy_reset(struct phy_device *phydev) 321 { 322 int err; 323 324 err = phy_write(phydev, DP83867_CTRL, DP83867_SW_RESET); 325 if (err < 0) 326 return err; 327 328 return dp83867_config_init(phydev); 329 } 330 331 static struct phy_driver dp83867_driver[] = { 332 { 333 .phy_id = DP83867_PHY_ID, 334 .phy_id_mask = 0xfffffff0, 335 .name = "TI DP83867", 336 .features = PHY_GBIT_FEATURES, 337 .flags = PHY_HAS_INTERRUPT, 338 339 .config_init = dp83867_config_init, 340 .soft_reset = dp83867_phy_reset, 341 342 /* IRQ related */ 343 .ack_interrupt = dp83867_ack_interrupt, 344 .config_intr = dp83867_config_intr, 345 346 .suspend = genphy_suspend, 347 .resume = genphy_resume, 348 }, 349 }; 350 module_phy_driver(dp83867_driver); 351 352 static struct mdio_device_id __maybe_unused dp83867_tbl[] = { 353 { DP83867_PHY_ID, 0xfffffff0 }, 354 { } 355 }; 356 357 MODULE_DEVICE_TABLE(mdio, dp83867_tbl); 358 359 MODULE_DESCRIPTION("Texas Instruments DP83867 PHY driver"); 360 MODULE_AUTHOR("Dan Murphy <dmurphy@ti.com"); 361 MODULE_LICENSE("GPL"); 362