Andy Fleming | 00db818 | 2005-07-30 19:31:23 -0400 | [diff] [blame^] | 1 | /* |
| 2 | * drivers/net/phy/phy.c |
| 3 | * |
| 4 | * Framework for configuring and reading PHY devices |
| 5 | * Based on code in sungem_phy.c and gianfar_phy.c |
| 6 | * |
| 7 | * Author: Andy Fleming |
| 8 | * |
| 9 | * Copyright (c) 2004 Freescale Semiconductor, Inc. |
| 10 | * |
| 11 | * This program is free software; you can redistribute it and/or modify it |
| 12 | * under the terms of the GNU General Public License as published by the |
| 13 | * Free Software Foundation; either version 2 of the License, or (at your |
| 14 | * option) any later version. |
| 15 | * |
| 16 | */ |
| 17 | #include <linux/config.h> |
| 18 | #include <linux/kernel.h> |
| 19 | #include <linux/sched.h> |
| 20 | #include <linux/string.h> |
| 21 | #include <linux/errno.h> |
| 22 | #include <linux/unistd.h> |
| 23 | #include <linux/slab.h> |
| 24 | #include <linux/interrupt.h> |
| 25 | #include <linux/init.h> |
| 26 | #include <linux/delay.h> |
| 27 | #include <linux/netdevice.h> |
| 28 | #include <linux/etherdevice.h> |
| 29 | #include <linux/skbuff.h> |
| 30 | #include <linux/spinlock.h> |
| 31 | #include <linux/mm.h> |
| 32 | #include <linux/module.h> |
| 33 | #include <linux/version.h> |
| 34 | #include <linux/mii.h> |
| 35 | #include <linux/ethtool.h> |
| 36 | #include <linux/phy.h> |
| 37 | |
| 38 | #include <asm/io.h> |
| 39 | #include <asm/irq.h> |
| 40 | #include <asm/uaccess.h> |
| 41 | |
| 42 | static void phy_change(void *data); |
| 43 | static void phy_timer(unsigned long data); |
| 44 | |
| 45 | /* Convenience function to print out the current phy status |
| 46 | */ |
| 47 | void phy_print_status(struct phy_device *phydev) |
| 48 | { |
| 49 | pr_info("%s: Link is %s", phydev->dev.bus_id, |
| 50 | phydev->link ? "Up" : "Down"); |
| 51 | if (phydev->link) |
| 52 | printk(" - %d/%s", phydev->speed, |
| 53 | DUPLEX_FULL == phydev->duplex ? |
| 54 | "Full" : "Half"); |
| 55 | |
| 56 | printk("\n"); |
| 57 | } |
| 58 | EXPORT_SYMBOL(phy_print_status); |
| 59 | |
| 60 | |
| 61 | /* Convenience functions for reading/writing a given PHY |
| 62 | * register. They MUST NOT be called from interrupt context, |
| 63 | * because the bus read/write functions may wait for an interrupt |
| 64 | * to conclude the operation. */ |
| 65 | int phy_read(struct phy_device *phydev, u16 regnum) |
| 66 | { |
| 67 | int retval; |
| 68 | struct mii_bus *bus = phydev->bus; |
| 69 | |
| 70 | spin_lock_bh(&bus->mdio_lock); |
| 71 | retval = bus->read(bus, phydev->addr, regnum); |
| 72 | spin_unlock_bh(&bus->mdio_lock); |
| 73 | |
| 74 | return retval; |
| 75 | } |
| 76 | EXPORT_SYMBOL(phy_read); |
| 77 | |
| 78 | int phy_write(struct phy_device *phydev, u16 regnum, u16 val) |
| 79 | { |
| 80 | int err; |
| 81 | struct mii_bus *bus = phydev->bus; |
| 82 | |
| 83 | spin_lock_bh(&bus->mdio_lock); |
| 84 | err = bus->write(bus, phydev->addr, regnum, val); |
| 85 | spin_unlock_bh(&bus->mdio_lock); |
| 86 | |
| 87 | return err; |
| 88 | } |
| 89 | EXPORT_SYMBOL(phy_write); |
| 90 | |
| 91 | |
| 92 | int phy_clear_interrupt(struct phy_device *phydev) |
| 93 | { |
| 94 | int err = 0; |
| 95 | |
| 96 | if (phydev->drv->ack_interrupt) |
| 97 | err = phydev->drv->ack_interrupt(phydev); |
| 98 | |
| 99 | return err; |
| 100 | } |
| 101 | |
| 102 | |
| 103 | int phy_config_interrupt(struct phy_device *phydev, u32 interrupts) |
| 104 | { |
| 105 | int err = 0; |
| 106 | |
| 107 | phydev->interrupts = interrupts; |
| 108 | if (phydev->drv->config_intr) |
| 109 | err = phydev->drv->config_intr(phydev); |
| 110 | |
| 111 | return err; |
| 112 | } |
| 113 | |
| 114 | |
| 115 | /* phy_aneg_done |
| 116 | * |
| 117 | * description: Reads the status register and returns 0 either if |
| 118 | * auto-negotiation is incomplete, or if there was an error. |
| 119 | * Returns BMSR_ANEGCOMPLETE if auto-negotiation is done. |
| 120 | */ |
| 121 | static inline int phy_aneg_done(struct phy_device *phydev) |
| 122 | { |
| 123 | int retval; |
| 124 | |
| 125 | retval = phy_read(phydev, MII_BMSR); |
| 126 | |
| 127 | return (retval < 0) ? retval : (retval & BMSR_ANEGCOMPLETE); |
| 128 | } |
| 129 | |
| 130 | /* phy_start_aneg |
| 131 | * |
| 132 | * description: Calls the PHY driver's config_aneg, and then |
| 133 | * sets the PHY state to PHY_AN if auto-negotiation is enabled, |
| 134 | * and to PHY_FORCING if auto-negotiation is disabled. Unless |
| 135 | * the PHY is currently HALTED. |
| 136 | */ |
| 137 | int phy_start_aneg(struct phy_device *phydev) |
| 138 | { |
| 139 | int err; |
| 140 | |
| 141 | spin_lock(&phydev->lock); |
| 142 | |
| 143 | if (AUTONEG_DISABLE == phydev->autoneg) |
| 144 | phy_sanitize_settings(phydev); |
| 145 | |
| 146 | err = phydev->drv->config_aneg(phydev); |
| 147 | |
| 148 | if (err < 0) |
| 149 | goto out_unlock; |
| 150 | |
| 151 | if (phydev->state != PHY_HALTED) { |
| 152 | if (AUTONEG_ENABLE == phydev->autoneg) { |
| 153 | phydev->state = PHY_AN; |
| 154 | phydev->link_timeout = PHY_AN_TIMEOUT; |
| 155 | } else { |
| 156 | phydev->state = PHY_FORCING; |
| 157 | phydev->link_timeout = PHY_FORCE_TIMEOUT; |
| 158 | } |
| 159 | } |
| 160 | |
| 161 | out_unlock: |
| 162 | spin_unlock(&phydev->lock); |
| 163 | return err; |
| 164 | } |
| 165 | EXPORT_SYMBOL(phy_start_aneg); |
| 166 | |
| 167 | |
| 168 | /* A structure for mapping a particular speed and duplex |
| 169 | * combination to a particular SUPPORTED and ADVERTISED value */ |
| 170 | struct phy_setting { |
| 171 | int speed; |
| 172 | int duplex; |
| 173 | u32 setting; |
| 174 | }; |
| 175 | |
| 176 | /* A mapping of all SUPPORTED settings to speed/duplex */ |
| 177 | static struct phy_setting settings[] = { |
| 178 | { |
| 179 | .speed = 10000, |
| 180 | .duplex = DUPLEX_FULL, |
| 181 | .setting = SUPPORTED_10000baseT_Full, |
| 182 | }, |
| 183 | { |
| 184 | .speed = SPEED_1000, |
| 185 | .duplex = DUPLEX_FULL, |
| 186 | .setting = SUPPORTED_1000baseT_Full, |
| 187 | }, |
| 188 | { |
| 189 | .speed = SPEED_1000, |
| 190 | .duplex = DUPLEX_HALF, |
| 191 | .setting = SUPPORTED_1000baseT_Half, |
| 192 | }, |
| 193 | { |
| 194 | .speed = SPEED_100, |
| 195 | .duplex = DUPLEX_FULL, |
| 196 | .setting = SUPPORTED_100baseT_Full, |
| 197 | }, |
| 198 | { |
| 199 | .speed = SPEED_100, |
| 200 | .duplex = DUPLEX_HALF, |
| 201 | .setting = SUPPORTED_100baseT_Half, |
| 202 | }, |
| 203 | { |
| 204 | .speed = SPEED_10, |
| 205 | .duplex = DUPLEX_FULL, |
| 206 | .setting = SUPPORTED_10baseT_Full, |
| 207 | }, |
| 208 | { |
| 209 | .speed = SPEED_10, |
| 210 | .duplex = DUPLEX_HALF, |
| 211 | .setting = SUPPORTED_10baseT_Half, |
| 212 | }, |
| 213 | }; |
| 214 | |
| 215 | #define MAX_NUM_SETTINGS (sizeof(settings)/sizeof(struct phy_setting)) |
| 216 | |
| 217 | /* phy_find_setting |
| 218 | * |
| 219 | * description: Searches the settings array for the setting which |
| 220 | * matches the desired speed and duplex, and returns the index |
| 221 | * of that setting. Returns the index of the last setting if |
| 222 | * none of the others match. |
| 223 | */ |
| 224 | static inline int phy_find_setting(int speed, int duplex) |
| 225 | { |
| 226 | int idx = 0; |
| 227 | |
| 228 | while (idx < ARRAY_SIZE(settings) && |
| 229 | (settings[idx].speed != speed || |
| 230 | settings[idx].duplex != duplex)) |
| 231 | idx++; |
| 232 | |
| 233 | return idx < MAX_NUM_SETTINGS ? idx : MAX_NUM_SETTINGS - 1; |
| 234 | } |
| 235 | |
| 236 | /* phy_find_valid |
| 237 | * idx: The first index in settings[] to search |
| 238 | * features: A mask of the valid settings |
| 239 | * |
| 240 | * description: Returns the index of the first valid setting less |
| 241 | * than or equal to the one pointed to by idx, as determined by |
| 242 | * the mask in features. Returns the index of the last setting |
| 243 | * if nothing else matches. |
| 244 | */ |
| 245 | static inline int phy_find_valid(int idx, u32 features) |
| 246 | { |
| 247 | while (idx < MAX_NUM_SETTINGS && !(settings[idx].setting & features)) |
| 248 | idx++; |
| 249 | |
| 250 | return idx < MAX_NUM_SETTINGS ? idx : MAX_NUM_SETTINGS - 1; |
| 251 | } |
| 252 | |
| 253 | /* phy_sanitize_settings |
| 254 | * |
| 255 | * description: Make sure the PHY is set to supported speeds and |
| 256 | * duplexes. Drop down by one in this order: 1000/FULL, |
| 257 | * 1000/HALF, 100/FULL, 100/HALF, 10/FULL, 10/HALF |
| 258 | */ |
| 259 | void phy_sanitize_settings(struct phy_device *phydev) |
| 260 | { |
| 261 | u32 features = phydev->supported; |
| 262 | int idx; |
| 263 | |
| 264 | /* Sanitize settings based on PHY capabilities */ |
| 265 | if ((features & SUPPORTED_Autoneg) == 0) |
| 266 | phydev->autoneg = 0; |
| 267 | |
| 268 | idx = phy_find_valid(phy_find_setting(phydev->speed, phydev->duplex), |
| 269 | features); |
| 270 | |
| 271 | phydev->speed = settings[idx].speed; |
| 272 | phydev->duplex = settings[idx].duplex; |
| 273 | } |
| 274 | EXPORT_SYMBOL(phy_sanitize_settings); |
| 275 | |
| 276 | /* phy_force_reduction |
| 277 | * |
| 278 | * description: Reduces the speed/duplex settings by |
| 279 | * one notch. The order is so: |
| 280 | * 1000/FULL, 1000/HALF, 100/FULL, 100/HALF, |
| 281 | * 10/FULL, 10/HALF. The function bottoms out at 10/HALF. |
| 282 | */ |
| 283 | static void phy_force_reduction(struct phy_device *phydev) |
| 284 | { |
| 285 | int idx; |
| 286 | |
| 287 | idx = phy_find_setting(phydev->speed, phydev->duplex); |
| 288 | |
| 289 | idx++; |
| 290 | |
| 291 | idx = phy_find_valid(idx, phydev->supported); |
| 292 | |
| 293 | phydev->speed = settings[idx].speed; |
| 294 | phydev->duplex = settings[idx].duplex; |
| 295 | |
| 296 | pr_info("Trying %d/%s\n", phydev->speed, |
| 297 | DUPLEX_FULL == phydev->duplex ? |
| 298 | "FULL" : "HALF"); |
| 299 | } |
| 300 | |
| 301 | /* phy_ethtool_sset: |
| 302 | * A generic ethtool sset function. Handles all the details |
| 303 | * |
| 304 | * A few notes about parameter checking: |
| 305 | * - We don't set port or transceiver, so we don't care what they |
| 306 | * were set to. |
| 307 | * - phy_start_aneg() will make sure forced settings are sane, and |
| 308 | * choose the next best ones from the ones selected, so we don't |
| 309 | * care if ethtool tries to give us bad values |
| 310 | */ |
| 311 | int phy_ethtool_sset(struct phy_device *phydev, struct ethtool_cmd *cmd) |
| 312 | { |
| 313 | if (cmd->phy_address != phydev->addr) |
| 314 | return -EINVAL; |
| 315 | |
| 316 | /* We make sure that we don't pass unsupported |
| 317 | * values in to the PHY */ |
| 318 | cmd->advertising &= phydev->supported; |
| 319 | |
| 320 | /* Verify the settings we care about. */ |
| 321 | if (cmd->autoneg != AUTONEG_ENABLE && cmd->autoneg != AUTONEG_DISABLE) |
| 322 | return -EINVAL; |
| 323 | |
| 324 | if (cmd->autoneg == AUTONEG_ENABLE && cmd->advertising == 0) |
| 325 | return -EINVAL; |
| 326 | |
| 327 | if (cmd->autoneg == AUTONEG_DISABLE |
| 328 | && ((cmd->speed != SPEED_1000 |
| 329 | && cmd->speed != SPEED_100 |
| 330 | && cmd->speed != SPEED_10) |
| 331 | || (cmd->duplex != DUPLEX_HALF |
| 332 | && cmd->duplex != DUPLEX_FULL))) |
| 333 | return -EINVAL; |
| 334 | |
| 335 | phydev->autoneg = cmd->autoneg; |
| 336 | |
| 337 | phydev->speed = cmd->speed; |
| 338 | |
| 339 | phydev->advertising = cmd->advertising; |
| 340 | |
| 341 | if (AUTONEG_ENABLE == cmd->autoneg) |
| 342 | phydev->advertising |= ADVERTISED_Autoneg; |
| 343 | else |
| 344 | phydev->advertising &= ~ADVERTISED_Autoneg; |
| 345 | |
| 346 | phydev->duplex = cmd->duplex; |
| 347 | |
| 348 | /* Restart the PHY */ |
| 349 | phy_start_aneg(phydev); |
| 350 | |
| 351 | return 0; |
| 352 | } |
| 353 | |
| 354 | int phy_ethtool_gset(struct phy_device *phydev, struct ethtool_cmd *cmd) |
| 355 | { |
| 356 | cmd->supported = phydev->supported; |
| 357 | |
| 358 | cmd->advertising = phydev->advertising; |
| 359 | |
| 360 | cmd->speed = phydev->speed; |
| 361 | cmd->duplex = phydev->duplex; |
| 362 | cmd->port = PORT_MII; |
| 363 | cmd->phy_address = phydev->addr; |
| 364 | cmd->transceiver = XCVR_EXTERNAL; |
| 365 | cmd->autoneg = phydev->autoneg; |
| 366 | |
| 367 | return 0; |
| 368 | } |
| 369 | |
| 370 | |
| 371 | /* Note that this function is currently incompatible with the |
| 372 | * PHYCONTROL layer. It changes registers without regard to |
| 373 | * current state. Use at own risk |
| 374 | */ |
| 375 | int phy_mii_ioctl(struct phy_device *phydev, |
| 376 | struct mii_ioctl_data *mii_data, int cmd) |
| 377 | { |
| 378 | u16 val = mii_data->val_in; |
| 379 | |
| 380 | switch (cmd) { |
| 381 | case SIOCGMIIPHY: |
| 382 | mii_data->phy_id = phydev->addr; |
| 383 | break; |
| 384 | case SIOCGMIIREG: |
| 385 | mii_data->val_out = phy_read(phydev, mii_data->reg_num); |
| 386 | break; |
| 387 | |
| 388 | case SIOCSMIIREG: |
| 389 | if (!capable(CAP_NET_ADMIN)) |
| 390 | return -EPERM; |
| 391 | |
| 392 | if (mii_data->phy_id == phydev->addr) { |
| 393 | switch(mii_data->reg_num) { |
| 394 | case MII_BMCR: |
| 395 | if (val & (BMCR_RESET|BMCR_ANENABLE)) |
| 396 | phydev->autoneg = AUTONEG_DISABLE; |
| 397 | else |
| 398 | phydev->autoneg = AUTONEG_ENABLE; |
| 399 | if ((!phydev->autoneg) && (val & BMCR_FULLDPLX)) |
| 400 | phydev->duplex = DUPLEX_FULL; |
| 401 | else |
| 402 | phydev->duplex = DUPLEX_HALF; |
| 403 | break; |
| 404 | case MII_ADVERTISE: |
| 405 | phydev->advertising = val; |
| 406 | break; |
| 407 | default: |
| 408 | /* do nothing */ |
| 409 | break; |
| 410 | } |
| 411 | } |
| 412 | |
| 413 | phy_write(phydev, mii_data->reg_num, val); |
| 414 | |
| 415 | if (mii_data->reg_num == MII_BMCR |
| 416 | && val & BMCR_RESET |
| 417 | && phydev->drv->config_init) |
| 418 | phydev->drv->config_init(phydev); |
| 419 | break; |
| 420 | } |
| 421 | |
| 422 | return 0; |
| 423 | } |
| 424 | |
| 425 | /* phy_start_machine: |
| 426 | * |
| 427 | * description: The PHY infrastructure can run a state machine |
| 428 | * which tracks whether the PHY is starting up, negotiating, |
| 429 | * etc. This function starts the timer which tracks the state |
| 430 | * of the PHY. If you want to be notified when the state |
| 431 | * changes, pass in the callback, otherwise, pass NULL. If you |
| 432 | * want to maintain your own state machine, do not call this |
| 433 | * function. */ |
| 434 | void phy_start_machine(struct phy_device *phydev, |
| 435 | void (*handler)(struct net_device *)) |
| 436 | { |
| 437 | phydev->adjust_state = handler; |
| 438 | |
| 439 | init_timer(&phydev->phy_timer); |
| 440 | phydev->phy_timer.function = &phy_timer; |
| 441 | phydev->phy_timer.data = (unsigned long) phydev; |
| 442 | mod_timer(&phydev->phy_timer, jiffies + HZ); |
| 443 | } |
| 444 | |
| 445 | /* phy_stop_machine |
| 446 | * |
| 447 | * description: Stops the state machine timer, sets the state to |
| 448 | * UP (unless it wasn't up yet), and then frees the interrupt, |
| 449 | * if it is in use. This function must be called BEFORE |
| 450 | * phy_detach. |
| 451 | */ |
| 452 | void phy_stop_machine(struct phy_device *phydev) |
| 453 | { |
| 454 | del_timer_sync(&phydev->phy_timer); |
| 455 | |
| 456 | spin_lock(&phydev->lock); |
| 457 | if (phydev->state > PHY_UP) |
| 458 | phydev->state = PHY_UP; |
| 459 | spin_unlock(&phydev->lock); |
| 460 | |
| 461 | if (phydev->irq != PHY_POLL) |
| 462 | phy_stop_interrupts(phydev); |
| 463 | |
| 464 | phydev->adjust_state = NULL; |
| 465 | } |
| 466 | |
| 467 | #ifdef CONFIG_PHYCONTROL |
| 468 | /* phy_error: |
| 469 | * |
| 470 | * Moves the PHY to the HALTED state in response to a read |
| 471 | * or write error, and tells the controller the link is down. |
| 472 | * Must not be called from interrupt context, or while the |
| 473 | * phydev->lock is held. |
| 474 | */ |
| 475 | void phy_error(struct phy_device *phydev) |
| 476 | { |
| 477 | spin_lock(&phydev->lock); |
| 478 | phydev->state = PHY_HALTED; |
| 479 | spin_unlock(&phydev->lock); |
| 480 | } |
| 481 | |
| 482 | /* phy_interrupt |
| 483 | * |
| 484 | * description: When a PHY interrupt occurs, the handler disables |
| 485 | * interrupts, and schedules a work task to clear the interrupt. |
| 486 | */ |
| 487 | static irqreturn_t phy_interrupt(int irq, void *phy_dat, struct pt_regs *regs) |
| 488 | { |
| 489 | struct phy_device *phydev = phy_dat; |
| 490 | |
| 491 | /* The MDIO bus is not allowed to be written in interrupt |
| 492 | * context, so we need to disable the irq here. A work |
| 493 | * queue will write the PHY to disable and clear the |
| 494 | * interrupt, and then reenable the irq line. */ |
| 495 | disable_irq_nosync(irq); |
| 496 | |
| 497 | schedule_work(&phydev->phy_queue); |
| 498 | |
| 499 | return IRQ_HANDLED; |
| 500 | } |
| 501 | |
| 502 | /* Enable the interrupts from the PHY side */ |
| 503 | int phy_enable_interrupts(struct phy_device *phydev) |
| 504 | { |
| 505 | int err; |
| 506 | |
| 507 | err = phy_clear_interrupt(phydev); |
| 508 | |
| 509 | if (err < 0) |
| 510 | return err; |
| 511 | |
| 512 | err = phy_config_interrupt(phydev, PHY_INTERRUPT_ENABLED); |
| 513 | |
| 514 | return err; |
| 515 | } |
| 516 | EXPORT_SYMBOL(phy_enable_interrupts); |
| 517 | |
| 518 | /* Disable the PHY interrupts from the PHY side */ |
| 519 | int phy_disable_interrupts(struct phy_device *phydev) |
| 520 | { |
| 521 | int err; |
| 522 | |
| 523 | /* Disable PHY interrupts */ |
| 524 | err = phy_config_interrupt(phydev, PHY_INTERRUPT_DISABLED); |
| 525 | |
| 526 | if (err) |
| 527 | goto phy_err; |
| 528 | |
| 529 | /* Clear the interrupt */ |
| 530 | err = phy_clear_interrupt(phydev); |
| 531 | |
| 532 | if (err) |
| 533 | goto phy_err; |
| 534 | |
| 535 | return 0; |
| 536 | |
| 537 | phy_err: |
| 538 | phy_error(phydev); |
| 539 | |
| 540 | return err; |
| 541 | } |
| 542 | EXPORT_SYMBOL(phy_disable_interrupts); |
| 543 | |
| 544 | /* phy_start_interrupts |
| 545 | * |
| 546 | * description: Request the interrupt for the given PHY. If |
| 547 | * this fails, then we set irq to PHY_POLL. |
| 548 | * Otherwise, we enable the interrupts in the PHY. |
| 549 | * Returns 0 on success. |
| 550 | * This should only be called with a valid IRQ number. |
| 551 | */ |
| 552 | int phy_start_interrupts(struct phy_device *phydev) |
| 553 | { |
| 554 | int err = 0; |
| 555 | |
| 556 | INIT_WORK(&phydev->phy_queue, phy_change, phydev); |
| 557 | |
| 558 | if (request_irq(phydev->irq, phy_interrupt, |
| 559 | SA_SHIRQ, |
| 560 | "phy_interrupt", |
| 561 | phydev) < 0) { |
| 562 | printk(KERN_WARNING "%s: Can't get IRQ %d (PHY)\n", |
| 563 | phydev->bus->name, |
| 564 | phydev->irq); |
| 565 | phydev->irq = PHY_POLL; |
| 566 | return 0; |
| 567 | } |
| 568 | |
| 569 | err = phy_enable_interrupts(phydev); |
| 570 | |
| 571 | return err; |
| 572 | } |
| 573 | EXPORT_SYMBOL(phy_start_interrupts); |
| 574 | |
| 575 | int phy_stop_interrupts(struct phy_device *phydev) |
| 576 | { |
| 577 | int err; |
| 578 | |
| 579 | err = phy_disable_interrupts(phydev); |
| 580 | |
| 581 | if (err) |
| 582 | phy_error(phydev); |
| 583 | |
| 584 | free_irq(phydev->irq, phydev); |
| 585 | |
| 586 | return err; |
| 587 | } |
| 588 | EXPORT_SYMBOL(phy_stop_interrupts); |
| 589 | |
| 590 | |
| 591 | /* Scheduled by the phy_interrupt/timer to handle PHY changes */ |
| 592 | static void phy_change(void *data) |
| 593 | { |
| 594 | int err; |
| 595 | struct phy_device *phydev = data; |
| 596 | |
| 597 | err = phy_disable_interrupts(phydev); |
| 598 | |
| 599 | if (err) |
| 600 | goto phy_err; |
| 601 | |
| 602 | spin_lock(&phydev->lock); |
| 603 | if ((PHY_RUNNING == phydev->state) || (PHY_NOLINK == phydev->state)) |
| 604 | phydev->state = PHY_CHANGELINK; |
| 605 | spin_unlock(&phydev->lock); |
| 606 | |
| 607 | enable_irq(phydev->irq); |
| 608 | |
| 609 | /* Reenable interrupts */ |
| 610 | err = phy_config_interrupt(phydev, PHY_INTERRUPT_ENABLED); |
| 611 | |
| 612 | if (err) |
| 613 | goto irq_enable_err; |
| 614 | |
| 615 | return; |
| 616 | |
| 617 | irq_enable_err: |
| 618 | disable_irq(phydev->irq); |
| 619 | phy_err: |
| 620 | phy_error(phydev); |
| 621 | } |
| 622 | |
| 623 | /* Bring down the PHY link, and stop checking the status. */ |
| 624 | void phy_stop(struct phy_device *phydev) |
| 625 | { |
| 626 | spin_lock(&phydev->lock); |
| 627 | |
| 628 | if (PHY_HALTED == phydev->state) |
| 629 | goto out_unlock; |
| 630 | |
| 631 | if (phydev->irq != PHY_POLL) { |
| 632 | /* Clear any pending interrupts */ |
| 633 | phy_clear_interrupt(phydev); |
| 634 | |
| 635 | /* Disable PHY Interrupts */ |
| 636 | phy_config_interrupt(phydev, PHY_INTERRUPT_DISABLED); |
| 637 | } |
| 638 | |
| 639 | phydev->state = PHY_HALTED; |
| 640 | |
| 641 | out_unlock: |
| 642 | spin_unlock(&phydev->lock); |
| 643 | } |
| 644 | |
| 645 | |
| 646 | /* phy_start |
| 647 | * |
| 648 | * description: Indicates the attached device's readiness to |
| 649 | * handle PHY-related work. Used during startup to start the |
| 650 | * PHY, and after a call to phy_stop() to resume operation. |
| 651 | * Also used to indicate the MDIO bus has cleared an error |
| 652 | * condition. |
| 653 | */ |
| 654 | void phy_start(struct phy_device *phydev) |
| 655 | { |
| 656 | spin_lock(&phydev->lock); |
| 657 | |
| 658 | switch (phydev->state) { |
| 659 | case PHY_STARTING: |
| 660 | phydev->state = PHY_PENDING; |
| 661 | break; |
| 662 | case PHY_READY: |
| 663 | phydev->state = PHY_UP; |
| 664 | break; |
| 665 | case PHY_HALTED: |
| 666 | phydev->state = PHY_RESUMING; |
| 667 | default: |
| 668 | break; |
| 669 | } |
| 670 | spin_unlock(&phydev->lock); |
| 671 | } |
| 672 | EXPORT_SYMBOL(phy_stop); |
| 673 | EXPORT_SYMBOL(phy_start); |
| 674 | |
| 675 | /* PHY timer which handles the state machine */ |
| 676 | static void phy_timer(unsigned long data) |
| 677 | { |
| 678 | struct phy_device *phydev = (struct phy_device *)data; |
| 679 | int needs_aneg = 0; |
| 680 | int err = 0; |
| 681 | |
| 682 | spin_lock(&phydev->lock); |
| 683 | |
| 684 | if (phydev->adjust_state) |
| 685 | phydev->adjust_state(phydev->attached_dev); |
| 686 | |
| 687 | switch(phydev->state) { |
| 688 | case PHY_DOWN: |
| 689 | case PHY_STARTING: |
| 690 | case PHY_READY: |
| 691 | case PHY_PENDING: |
| 692 | break; |
| 693 | case PHY_UP: |
| 694 | needs_aneg = 1; |
| 695 | |
| 696 | phydev->link_timeout = PHY_AN_TIMEOUT; |
| 697 | |
| 698 | break; |
| 699 | case PHY_AN: |
| 700 | /* Check if negotiation is done. Break |
| 701 | * if there's an error */ |
| 702 | err = phy_aneg_done(phydev); |
| 703 | if (err < 0) |
| 704 | break; |
| 705 | |
| 706 | /* If auto-negotiation is done, we change to |
| 707 | * either RUNNING, or NOLINK */ |
| 708 | if (err > 0) { |
| 709 | err = phy_read_status(phydev); |
| 710 | |
| 711 | if (err) |
| 712 | break; |
| 713 | |
| 714 | if (phydev->link) { |
| 715 | phydev->state = PHY_RUNNING; |
| 716 | netif_carrier_on(phydev->attached_dev); |
| 717 | } else { |
| 718 | phydev->state = PHY_NOLINK; |
| 719 | netif_carrier_off(phydev->attached_dev); |
| 720 | } |
| 721 | |
| 722 | phydev->adjust_link(phydev->attached_dev); |
| 723 | |
| 724 | } else if (0 == phydev->link_timeout--) { |
| 725 | /* The counter expired, so either we |
| 726 | * switch to forced mode, or the |
| 727 | * magic_aneg bit exists, and we try aneg |
| 728 | * again */ |
| 729 | if (!(phydev->drv->flags & PHY_HAS_MAGICANEG)) { |
| 730 | int idx; |
| 731 | |
| 732 | /* We'll start from the |
| 733 | * fastest speed, and work |
| 734 | * our way down */ |
| 735 | idx = phy_find_valid(0, |
| 736 | phydev->supported); |
| 737 | |
| 738 | phydev->speed = settings[idx].speed; |
| 739 | phydev->duplex = settings[idx].duplex; |
| 740 | |
| 741 | phydev->autoneg = AUTONEG_DISABLE; |
| 742 | phydev->state = PHY_FORCING; |
| 743 | phydev->link_timeout = |
| 744 | PHY_FORCE_TIMEOUT; |
| 745 | |
| 746 | pr_info("Trying %d/%s\n", |
| 747 | phydev->speed, |
| 748 | DUPLEX_FULL == |
| 749 | phydev->duplex ? |
| 750 | "FULL" : "HALF"); |
| 751 | } |
| 752 | |
| 753 | needs_aneg = 1; |
| 754 | } |
| 755 | break; |
| 756 | case PHY_NOLINK: |
| 757 | err = phy_read_status(phydev); |
| 758 | |
| 759 | if (err) |
| 760 | break; |
| 761 | |
| 762 | if (phydev->link) { |
| 763 | phydev->state = PHY_RUNNING; |
| 764 | netif_carrier_on(phydev->attached_dev); |
| 765 | phydev->adjust_link(phydev->attached_dev); |
| 766 | } |
| 767 | break; |
| 768 | case PHY_FORCING: |
| 769 | err = phy_read_status(phydev); |
| 770 | |
| 771 | if (err) |
| 772 | break; |
| 773 | |
| 774 | if (phydev->link) { |
| 775 | phydev->state = PHY_RUNNING; |
| 776 | netif_carrier_on(phydev->attached_dev); |
| 777 | } else { |
| 778 | if (0 == phydev->link_timeout--) { |
| 779 | phy_force_reduction(phydev); |
| 780 | needs_aneg = 1; |
| 781 | } |
| 782 | } |
| 783 | |
| 784 | phydev->adjust_link(phydev->attached_dev); |
| 785 | break; |
| 786 | case PHY_RUNNING: |
| 787 | /* Only register a CHANGE if we are |
| 788 | * polling */ |
| 789 | if (PHY_POLL == phydev->irq) |
| 790 | phydev->state = PHY_CHANGELINK; |
| 791 | break; |
| 792 | case PHY_CHANGELINK: |
| 793 | err = phy_read_status(phydev); |
| 794 | |
| 795 | if (err) |
| 796 | break; |
| 797 | |
| 798 | if (phydev->link) { |
| 799 | phydev->state = PHY_RUNNING; |
| 800 | netif_carrier_on(phydev->attached_dev); |
| 801 | } else { |
| 802 | phydev->state = PHY_NOLINK; |
| 803 | netif_carrier_off(phydev->attached_dev); |
| 804 | } |
| 805 | |
| 806 | phydev->adjust_link(phydev->attached_dev); |
| 807 | |
| 808 | if (PHY_POLL != phydev->irq) |
| 809 | err = phy_config_interrupt(phydev, |
| 810 | PHY_INTERRUPT_ENABLED); |
| 811 | break; |
| 812 | case PHY_HALTED: |
| 813 | if (phydev->link) { |
| 814 | phydev->link = 0; |
| 815 | netif_carrier_off(phydev->attached_dev); |
| 816 | phydev->adjust_link(phydev->attached_dev); |
| 817 | } |
| 818 | break; |
| 819 | case PHY_RESUMING: |
| 820 | |
| 821 | err = phy_clear_interrupt(phydev); |
| 822 | |
| 823 | if (err) |
| 824 | break; |
| 825 | |
| 826 | err = phy_config_interrupt(phydev, |
| 827 | PHY_INTERRUPT_ENABLED); |
| 828 | |
| 829 | if (err) |
| 830 | break; |
| 831 | |
| 832 | if (AUTONEG_ENABLE == phydev->autoneg) { |
| 833 | err = phy_aneg_done(phydev); |
| 834 | if (err < 0) |
| 835 | break; |
| 836 | |
| 837 | /* err > 0 if AN is done. |
| 838 | * Otherwise, it's 0, and we're |
| 839 | * still waiting for AN */ |
| 840 | if (err > 0) { |
| 841 | phydev->state = PHY_RUNNING; |
| 842 | } else { |
| 843 | phydev->state = PHY_AN; |
| 844 | phydev->link_timeout = PHY_AN_TIMEOUT; |
| 845 | } |
| 846 | } else |
| 847 | phydev->state = PHY_RUNNING; |
| 848 | break; |
| 849 | } |
| 850 | |
| 851 | spin_unlock(&phydev->lock); |
| 852 | |
| 853 | if (needs_aneg) |
| 854 | err = phy_start_aneg(phydev); |
| 855 | |
| 856 | if (err < 0) |
| 857 | phy_error(phydev); |
| 858 | |
| 859 | mod_timer(&phydev->phy_timer, jiffies + PHY_STATE_TIME * HZ); |
| 860 | } |
| 861 | |
| 862 | #endif /* CONFIG_PHYCONTROL */ |