1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Driver for the Texas Instruments DP83867 PHY 4 * 5 * Copyright (C) 2015 Texas Instruments Inc. 6 */ 7 8 #include <linux/ethtool.h> 9 #include <linux/kernel.h> 10 #include <linux/mii.h> 11 #include <linux/module.h> 12 #include <linux/of.h> 13 #include <linux/phy.h> 14 #include <linux/delay.h> 15 16 #include <dt-bindings/net/ti-dp83867.h> 17 18 #define DP83867_PHY_ID 0x2000a231 19 #define DP83867_DEVADDR 0x1f 20 21 #define MII_DP83867_PHYCTRL 0x10 22 #define MII_DP83867_MICR 0x12 23 #define MII_DP83867_ISR 0x13 24 #define DP83867_CTRL 0x1f 25 #define DP83867_CFG3 0x1e 26 27 /* Extended Registers */ 28 #define DP83867_CFG4 0x0031 29 #define DP83867_CFG4_SGMII_ANEG_MASK (BIT(5) | BIT(6)) 30 #define DP83867_CFG4_SGMII_ANEG_TIMER_11MS (3 << 5) 31 #define DP83867_CFG4_SGMII_ANEG_TIMER_800US (2 << 5) 32 #define DP83867_CFG4_SGMII_ANEG_TIMER_2US (1 << 5) 33 #define DP83867_CFG4_SGMII_ANEG_TIMER_16MS (0 << 5) 34 35 #define DP83867_RGMIICTL 0x0032 36 #define DP83867_STRAP_STS1 0x006E 37 #define DP83867_RGMIIDCTL 0x0086 38 #define DP83867_IO_MUX_CFG 0x0170 39 #define DP83867_10M_SGMII_CFG 0x016F 40 #define DP83867_10M_SGMII_RATE_ADAPT_MASK BIT(7) 41 42 #define DP83867_SW_RESET BIT(15) 43 #define DP83867_SW_RESTART BIT(14) 44 45 /* MICR Interrupt bits */ 46 #define MII_DP83867_MICR_AN_ERR_INT_EN BIT(15) 47 #define MII_DP83867_MICR_SPEED_CHNG_INT_EN BIT(14) 48 #define MII_DP83867_MICR_DUP_MODE_CHNG_INT_EN BIT(13) 49 #define MII_DP83867_MICR_PAGE_RXD_INT_EN BIT(12) 50 #define MII_DP83867_MICR_AUTONEG_COMP_INT_EN BIT(11) 51 #define MII_DP83867_MICR_LINK_STS_CHNG_INT_EN BIT(10) 52 #define MII_DP83867_MICR_FALSE_CARRIER_INT_EN BIT(8) 53 #define MII_DP83867_MICR_SLEEP_MODE_CHNG_INT_EN BIT(4) 54 #define MII_DP83867_MICR_WOL_INT_EN BIT(3) 55 #define MII_DP83867_MICR_XGMII_ERR_INT_EN BIT(2) 56 #define MII_DP83867_MICR_POL_CHNG_INT_EN BIT(1) 57 #define MII_DP83867_MICR_JABBER_INT_EN BIT(0) 58 59 /* RGMIICTL bits */ 60 #define DP83867_RGMII_TX_CLK_DELAY_EN BIT(1) 61 #define DP83867_RGMII_RX_CLK_DELAY_EN BIT(0) 62 63 /* STRAP_STS1 bits */ 64 #define DP83867_STRAP_STS1_RESERVED BIT(11) 65 66 /* PHY CTRL bits */ 67 #define DP83867_PHYCR_FIFO_DEPTH_SHIFT 14 68 #define DP83867_PHYCR_FIFO_DEPTH_MASK (3 << 14) 69 #define DP83867_PHYCR_RESERVED_MASK BIT(11) 70 71 /* RGMIIDCTL bits */ 72 #define DP83867_RGMII_TX_CLK_DELAY_SHIFT 4 73 74 /* IO_MUX_CFG bits */ 75 #define DP83867_IO_MUX_CFG_IO_IMPEDANCE_CTRL 0x1f 76 77 #define DP83867_IO_MUX_CFG_IO_IMPEDANCE_MAX 0x0 78 #define DP83867_IO_MUX_CFG_IO_IMPEDANCE_MIN 0x1f 79 #define DP83867_IO_MUX_CFG_CLK_O_SEL_MASK (0x1f << 8) 80 #define DP83867_IO_MUX_CFG_CLK_O_SEL_SHIFT 8 81 82 /* CFG4 bits */ 83 #define DP83867_CFG4_PORT_MIRROR_EN BIT(0) 84 85 enum { 86 DP83867_PORT_MIRROING_KEEP, 87 DP83867_PORT_MIRROING_EN, 88 DP83867_PORT_MIRROING_DIS, 89 }; 90 91 struct dp83867_private { 92 int rx_id_delay; 93 int tx_id_delay; 94 int fifo_depth; 95 int io_impedance; 96 int port_mirroring; 97 bool rxctrl_strap_quirk; 98 int clk_output_sel; 99 }; 100 101 static int dp83867_ack_interrupt(struct phy_device *phydev) 102 { 103 int err = phy_read(phydev, MII_DP83867_ISR); 104 105 if (err < 0) 106 return err; 107 108 return 0; 109 } 110 111 static int dp83867_config_intr(struct phy_device *phydev) 112 { 113 int micr_status; 114 115 if (phydev->interrupts == PHY_INTERRUPT_ENABLED) { 116 micr_status = phy_read(phydev, MII_DP83867_MICR); 117 if (micr_status < 0) 118 return micr_status; 119 120 micr_status |= 121 (MII_DP83867_MICR_AN_ERR_INT_EN | 122 MII_DP83867_MICR_SPEED_CHNG_INT_EN | 123 MII_DP83867_MICR_AUTONEG_COMP_INT_EN | 124 MII_DP83867_MICR_LINK_STS_CHNG_INT_EN | 125 MII_DP83867_MICR_DUP_MODE_CHNG_INT_EN | 126 MII_DP83867_MICR_SLEEP_MODE_CHNG_INT_EN); 127 128 return phy_write(phydev, MII_DP83867_MICR, micr_status); 129 } 130 131 micr_status = 0x0; 132 return phy_write(phydev, MII_DP83867_MICR, micr_status); 133 } 134 135 static int dp83867_config_port_mirroring(struct phy_device *phydev) 136 { 137 struct dp83867_private *dp83867 = 138 (struct dp83867_private *)phydev->priv; 139 140 if (dp83867->port_mirroring == DP83867_PORT_MIRROING_EN) 141 phy_set_bits_mmd(phydev, DP83867_DEVADDR, DP83867_CFG4, 142 DP83867_CFG4_PORT_MIRROR_EN); 143 else 144 phy_clear_bits_mmd(phydev, DP83867_DEVADDR, DP83867_CFG4, 145 DP83867_CFG4_PORT_MIRROR_EN); 146 return 0; 147 } 148 149 #ifdef CONFIG_OF_MDIO 150 static int dp83867_of_init(struct phy_device *phydev) 151 { 152 struct dp83867_private *dp83867 = phydev->priv; 153 struct device *dev = &phydev->mdio.dev; 154 struct device_node *of_node = dev->of_node; 155 int ret; 156 157 if (!of_node) 158 return -ENODEV; 159 160 dp83867->io_impedance = -EINVAL; 161 162 /* Optional configuration */ 163 ret = of_property_read_u32(of_node, "ti,clk-output-sel", 164 &dp83867->clk_output_sel); 165 if (ret || dp83867->clk_output_sel > DP83867_CLK_O_SEL_REF_CLK) 166 /* Keep the default value if ti,clk-output-sel is not set 167 * or too high 168 */ 169 dp83867->clk_output_sel = DP83867_CLK_O_SEL_REF_CLK; 170 171 if (of_property_read_bool(of_node, "ti,max-output-impedance")) 172 dp83867->io_impedance = DP83867_IO_MUX_CFG_IO_IMPEDANCE_MAX; 173 else if (of_property_read_bool(of_node, "ti,min-output-impedance")) 174 dp83867->io_impedance = DP83867_IO_MUX_CFG_IO_IMPEDANCE_MIN; 175 176 dp83867->rxctrl_strap_quirk = of_property_read_bool(of_node, 177 "ti,dp83867-rxctrl-strap-quirk"); 178 179 ret = of_property_read_u32(of_node, "ti,rx-internal-delay", 180 &dp83867->rx_id_delay); 181 if (ret && 182 (phydev->interface == PHY_INTERFACE_MODE_RGMII_ID || 183 phydev->interface == PHY_INTERFACE_MODE_RGMII_RXID)) 184 return ret; 185 186 ret = of_property_read_u32(of_node, "ti,tx-internal-delay", 187 &dp83867->tx_id_delay); 188 if (ret && 189 (phydev->interface == PHY_INTERFACE_MODE_RGMII_ID || 190 phydev->interface == PHY_INTERFACE_MODE_RGMII_TXID)) 191 return ret; 192 193 if (of_property_read_bool(of_node, "enet-phy-lane-swap")) 194 dp83867->port_mirroring = DP83867_PORT_MIRROING_EN; 195 196 if (of_property_read_bool(of_node, "enet-phy-lane-no-swap")) 197 dp83867->port_mirroring = DP83867_PORT_MIRROING_DIS; 198 199 return of_property_read_u32(of_node, "ti,fifo-depth", 200 &dp83867->fifo_depth); 201 } 202 #else 203 static int dp83867_of_init(struct phy_device *phydev) 204 { 205 return 0; 206 } 207 #endif /* CONFIG_OF_MDIO */ 208 209 static int dp83867_config_init(struct phy_device *phydev) 210 { 211 struct dp83867_private *dp83867; 212 int ret, val, bs; 213 u16 delay; 214 215 if (!phydev->priv) { 216 dp83867 = devm_kzalloc(&phydev->mdio.dev, sizeof(*dp83867), 217 GFP_KERNEL); 218 if (!dp83867) 219 return -ENOMEM; 220 221 phydev->priv = dp83867; 222 ret = dp83867_of_init(phydev); 223 if (ret) 224 return ret; 225 } else { 226 dp83867 = (struct dp83867_private *)phydev->priv; 227 } 228 229 /* RX_DV/RX_CTRL strapped in mode 1 or mode 2 workaround */ 230 if (dp83867->rxctrl_strap_quirk) 231 phy_clear_bits_mmd(phydev, DP83867_DEVADDR, DP83867_CFG4, 232 BIT(7)); 233 234 if (phy_interface_is_rgmii(phydev)) { 235 val = phy_read(phydev, MII_DP83867_PHYCTRL); 236 if (val < 0) 237 return val; 238 val &= ~DP83867_PHYCR_FIFO_DEPTH_MASK; 239 val |= (dp83867->fifo_depth << DP83867_PHYCR_FIFO_DEPTH_SHIFT); 240 241 /* The code below checks if "port mirroring" N/A MODE4 has been 242 * enabled during power on bootstrap. 243 * 244 * Such N/A mode enabled by mistake can put PHY IC in some 245 * internal testing mode and disable RGMII transmission. 246 * 247 * In this particular case one needs to check STRAP_STS1 248 * register's bit 11 (marked as RESERVED). 249 */ 250 251 bs = phy_read_mmd(phydev, DP83867_DEVADDR, DP83867_STRAP_STS1); 252 if (bs & DP83867_STRAP_STS1_RESERVED) 253 val &= ~DP83867_PHYCR_RESERVED_MASK; 254 255 ret = phy_write(phydev, MII_DP83867_PHYCTRL, val); 256 if (ret) 257 return ret; 258 259 /* Set up RGMII delays */ 260 val = phy_read_mmd(phydev, DP83867_DEVADDR, DP83867_RGMIICTL); 261 262 if (phydev->interface == PHY_INTERFACE_MODE_RGMII_ID) 263 val |= (DP83867_RGMII_TX_CLK_DELAY_EN | DP83867_RGMII_RX_CLK_DELAY_EN); 264 265 if (phydev->interface == PHY_INTERFACE_MODE_RGMII_TXID) 266 val |= DP83867_RGMII_TX_CLK_DELAY_EN; 267 268 if (phydev->interface == PHY_INTERFACE_MODE_RGMII_RXID) 269 val |= DP83867_RGMII_RX_CLK_DELAY_EN; 270 271 phy_write_mmd(phydev, DP83867_DEVADDR, DP83867_RGMIICTL, val); 272 273 delay = (dp83867->rx_id_delay | 274 (dp83867->tx_id_delay << DP83867_RGMII_TX_CLK_DELAY_SHIFT)); 275 276 phy_write_mmd(phydev, DP83867_DEVADDR, DP83867_RGMIIDCTL, 277 delay); 278 279 if (dp83867->io_impedance >= 0) 280 phy_modify_mmd(phydev, DP83867_DEVADDR, DP83867_IO_MUX_CFG, 281 DP83867_IO_MUX_CFG_IO_IMPEDANCE_CTRL, 282 dp83867->io_impedance & 283 DP83867_IO_MUX_CFG_IO_IMPEDANCE_CTRL); 284 } 285 286 if (phydev->interface == PHY_INTERFACE_MODE_SGMII) { 287 /* For support SPEED_10 in SGMII mode 288 * DP83867_10M_SGMII_RATE_ADAPT bit 289 * has to be cleared by software. That 290 * does not affect SPEED_100 and 291 * SPEED_1000. 292 */ 293 ret = phy_modify_mmd(phydev, DP83867_DEVADDR, 294 DP83867_10M_SGMII_CFG, 295 DP83867_10M_SGMII_RATE_ADAPT_MASK, 296 0); 297 if (ret) 298 return ret; 299 300 /* After reset SGMII Autoneg timer is set to 2us (bits 6 and 5 301 * are 01). That is not enough to finalize autoneg on some 302 * devices. Increase this timer duration to maximum 16ms. 303 */ 304 ret = phy_modify_mmd(phydev, DP83867_DEVADDR, 305 DP83867_CFG4, 306 DP83867_CFG4_SGMII_ANEG_MASK, 307 DP83867_CFG4_SGMII_ANEG_TIMER_16MS); 308 309 if (ret) 310 return ret; 311 } 312 313 /* Enable Interrupt output INT_OE in CFG3 register */ 314 if (phy_interrupt_is_valid(phydev)) { 315 val = phy_read(phydev, DP83867_CFG3); 316 val |= BIT(7); 317 phy_write(phydev, DP83867_CFG3, val); 318 } 319 320 if (dp83867->port_mirroring != DP83867_PORT_MIRROING_KEEP) 321 dp83867_config_port_mirroring(phydev); 322 323 /* Clock output selection if muxing property is set */ 324 if (dp83867->clk_output_sel != DP83867_CLK_O_SEL_REF_CLK) 325 phy_modify_mmd(phydev, DP83867_DEVADDR, DP83867_IO_MUX_CFG, 326 DP83867_IO_MUX_CFG_CLK_O_SEL_MASK, 327 dp83867->clk_output_sel << 328 DP83867_IO_MUX_CFG_CLK_O_SEL_SHIFT); 329 330 return 0; 331 } 332 333 static int dp83867_phy_reset(struct phy_device *phydev) 334 { 335 int err; 336 337 err = phy_write(phydev, DP83867_CTRL, DP83867_SW_RESET); 338 if (err < 0) 339 return err; 340 341 usleep_range(10, 20); 342 343 return 0; 344 } 345 346 static struct phy_driver dp83867_driver[] = { 347 { 348 .phy_id = DP83867_PHY_ID, 349 .phy_id_mask = 0xfffffff0, 350 .name = "TI DP83867", 351 /* PHY_GBIT_FEATURES */ 352 353 .config_init = dp83867_config_init, 354 .soft_reset = dp83867_phy_reset, 355 356 /* IRQ related */ 357 .ack_interrupt = dp83867_ack_interrupt, 358 .config_intr = dp83867_config_intr, 359 360 .suspend = genphy_suspend, 361 .resume = genphy_resume, 362 }, 363 }; 364 module_phy_driver(dp83867_driver); 365 366 static struct mdio_device_id __maybe_unused dp83867_tbl[] = { 367 { DP83867_PHY_ID, 0xfffffff0 }, 368 { } 369 }; 370 371 MODULE_DEVICE_TABLE(mdio, dp83867_tbl); 372 373 MODULE_DESCRIPTION("Texas Instruments DP83867 PHY driver"); 374 MODULE_AUTHOR("Dan Murphy <dmurphy@ti.com"); 375 MODULE_LICENSE("GPL v2"); 376