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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 | // SPDX-License-Identifier: GPL-2.0+ /* * drivers/net/phy/lxt.c * * Driver for Intel LXT PHYs * * Author: Andy Fleming * * Copyright (c) 2004 Freescale Semiconductor, Inc. */ #include <linux/kernel.h> #include <linux/string.h> #include <linux/errno.h> #include <linux/unistd.h> #include <linux/interrupt.h> #include <linux/init.h> #include <linux/delay.h> #include <linux/netdevice.h> #include <linux/etherdevice.h> #include <linux/skbuff.h> #include <linux/spinlock.h> #include <linux/mm.h> #include <linux/module.h> #include <linux/mii.h> #include <linux/ethtool.h> #include <linux/phy.h> #include <asm/io.h> #include <asm/irq.h> #include <linux/uaccess.h> /* The Level one LXT970 is used by many boards */ #define MII_LXT970_IER 17 /* Interrupt Enable Register */ #define MII_LXT970_IER_IEN 0x0002 #define MII_LXT970_ISR 18 /* Interrupt Status Register */ #define MII_LXT970_IRS_MINT BIT(15) #define MII_LXT970_CONFIG 19 /* Configuration Register */ /* ------------------------------------------------------------------------- */ /* The Level one LXT971 is used on some of my custom boards */ /* register definitions for the 971 */ #define MII_LXT971_IER 18 /* Interrupt Enable Register */ #define MII_LXT971_IER_IEN 0x00f2 #define MII_LXT971_ISR 19 /* Interrupt Status Register */ #define MII_LXT971_ISR_MASK 0x00f0 /* register definitions for the 973 */ #define MII_LXT973_PCR 16 /* Port Configuration Register */ #define PCR_FIBER_SELECT 1 MODULE_DESCRIPTION("Intel LXT PHY driver"); MODULE_AUTHOR("Andy Fleming"); MODULE_LICENSE("GPL"); static int lxt970_ack_interrupt(struct phy_device *phydev) { int err; err = phy_read(phydev, MII_BMSR); if (err < 0) return err; err = phy_read(phydev, MII_LXT970_ISR); if (err < 0) return err; return 0; } static int lxt970_config_intr(struct phy_device *phydev) { int err; if (phydev->interrupts == PHY_INTERRUPT_ENABLED) { err = lxt970_ack_interrupt(phydev); if (err) return err; err = phy_write(phydev, MII_LXT970_IER, MII_LXT970_IER_IEN); } else { err = phy_write(phydev, MII_LXT970_IER, 0); if (err) return err; err = lxt970_ack_interrupt(phydev); } return err; } static irqreturn_t lxt970_handle_interrupt(struct phy_device *phydev) { int irq_status; /* The interrupt status register is cleared by reading BMSR * followed by MII_LXT970_ISR */ irq_status = phy_read(phydev, MII_BMSR); if (irq_status < 0) { phy_error(phydev); return IRQ_NONE; } irq_status = phy_read(phydev, MII_LXT970_ISR); if (irq_status < 0) { phy_error(phydev); return IRQ_NONE; } if (!(irq_status & MII_LXT970_IRS_MINT)) return IRQ_NONE; phy_trigger_machine(phydev); return IRQ_HANDLED; } static int lxt970_config_init(struct phy_device *phydev) { return phy_write(phydev, MII_LXT970_CONFIG, 0); } static int lxt971_ack_interrupt(struct phy_device *phydev) { int err = phy_read(phydev, MII_LXT971_ISR); if (err < 0) return err; return 0; } static int lxt971_config_intr(struct phy_device *phydev) { int err; if (phydev->interrupts == PHY_INTERRUPT_ENABLED) { err = lxt971_ack_interrupt(phydev); if (err) return err; err = phy_write(phydev, MII_LXT971_IER, MII_LXT971_IER_IEN); } else { err = phy_write(phydev, MII_LXT971_IER, 0); if (err) return err; err = lxt971_ack_interrupt(phydev); } return err; } static irqreturn_t lxt971_handle_interrupt(struct phy_device *phydev) { int irq_status; irq_status = phy_read(phydev, MII_LXT971_ISR); if (irq_status < 0) { phy_error(phydev); return IRQ_NONE; } if (!(irq_status & MII_LXT971_ISR_MASK)) return IRQ_NONE; phy_trigger_machine(phydev); return IRQ_HANDLED; } /* * A2 version of LXT973 chip has an ERRATA: it randomly return the contents * of the previous even register when you read a odd register regularly */ static int lxt973a2_update_link(struct phy_device *phydev) { int status; int control; int retry = 8; /* we try 8 times */ /* Do a fake read */ status = phy_read(phydev, MII_BMSR); if (status < 0) return status; control = phy_read(phydev, MII_BMCR); if (control < 0) return control; do { /* Read link and autonegotiation status */ status = phy_read(phydev, MII_BMSR); } while (status >= 0 && retry-- && status == control); if (status < 0) return status; if ((status & BMSR_LSTATUS) == 0) phydev->link = 0; else phydev->link = 1; return 0; } static int lxt973a2_read_status(struct phy_device *phydev) { int adv; int err; int lpa; /* Update the link, but return if there was an error */ err = lxt973a2_update_link(phydev); if (err) return err; if (AUTONEG_ENABLE == phydev->autoneg) { int retry = 1; adv = phy_read(phydev, MII_ADVERTISE); if (adv < 0) return adv; do { lpa = phy_read(phydev, MII_LPA); if (lpa < 0) return lpa; /* If both registers are equal, it is suspect but not * impossible, hence a new try */ } while (lpa == adv && retry--); mii_lpa_to_linkmode_lpa_t(phydev->lp_advertising, lpa); lpa &= adv; phydev->speed = SPEED_10; phydev->duplex = DUPLEX_HALF; phydev->pause = phydev->asym_pause = 0; if (lpa & (LPA_100FULL | LPA_100HALF)) { phydev->speed = SPEED_100; if (lpa & LPA_100FULL) phydev->duplex = DUPLEX_FULL; } else { if (lpa & LPA_10FULL) phydev->duplex = DUPLEX_FULL; } phy_resolve_aneg_pause(phydev); } else { err = genphy_read_status_fixed(phydev); if (err < 0) return err; phydev->pause = phydev->asym_pause = 0; linkmode_zero(phydev->lp_advertising); } return 0; } static int lxt973_probe(struct phy_device *phydev) { int val = phy_read(phydev, MII_LXT973_PCR); if (val & PCR_FIBER_SELECT) { /* * If fiber is selected, then the only correct setting * is 100Mbps, full duplex, and auto negotiation off. */ val = phy_read(phydev, MII_BMCR); val |= (BMCR_SPEED100 | BMCR_FULLDPLX); val &= ~BMCR_ANENABLE; phy_write(phydev, MII_BMCR, val); /* Remember that the port is in fiber mode. */ phydev->priv = lxt973_probe; phydev->port = PORT_FIBRE; } else { phydev->priv = NULL; } return 0; } static int lxt973_config_aneg(struct phy_device *phydev) { /* Do nothing if port is in fiber mode. */ return phydev->priv ? 0 : genphy_config_aneg(phydev); } static struct phy_driver lxt97x_driver[] = { { .phy_id = 0x78100000, .name = "LXT970", .phy_id_mask = 0xfffffff0, /* PHY_BASIC_FEATURES */ .config_init = lxt970_config_init, .config_intr = lxt970_config_intr, .handle_interrupt = lxt970_handle_interrupt, }, { .phy_id = 0x001378e0, .name = "LXT971", .phy_id_mask = 0xfffffff0, /* PHY_BASIC_FEATURES */ .config_intr = lxt971_config_intr, .handle_interrupt = lxt971_handle_interrupt, .suspend = genphy_suspend, .resume = genphy_resume, }, { .phy_id = 0x00137a10, .name = "LXT973-A2", .phy_id_mask = 0xffffffff, /* PHY_BASIC_FEATURES */ .flags = 0, .probe = lxt973_probe, .config_aneg = lxt973_config_aneg, .read_status = lxt973a2_read_status, .suspend = genphy_suspend, .resume = genphy_resume, }, { .phy_id = 0x00137a10, .name = "LXT973", .phy_id_mask = 0xfffffff0, /* PHY_BASIC_FEATURES */ .flags = 0, .probe = lxt973_probe, .config_aneg = lxt973_config_aneg, .suspend = genphy_suspend, .resume = genphy_resume, } }; module_phy_driver(lxt97x_driver); static struct mdio_device_id __maybe_unused lxt_tbl[] = { { 0x78100000, 0xfffffff0 }, { 0x001378e0, 0xfffffff0 }, { 0x00137a10, 0xfffffff0 }, { } }; MODULE_DEVICE_TABLE(mdio, lxt_tbl); |