drivers/net/phy/dp83640.c

   1 /*
   2  * Driver for the National Semiconductor DP83640 PHYTER
   3  *
   4  * Copyright (C) 2010 OMICRON electronics GmbH
   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, or
   9  *  (at your option) any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, write to the Free Software
  18  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19  */
  20
  21 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  22
  23 #include <linux/crc32.h>
  24 #include <linux/ethtool.h>
  25 #include <linux/kernel.h>
  26 #include <linux/list.h>
  27 #include <linux/mii.h>
  28 #include <linux/module.h>
  29 #include <linux/net_tstamp.h>
  30 #include <linux/netdevice.h>
  31 #include <linux/if_vlan.h>
  32 #include <linux/phy.h>
  33 #include <linux/ptp_classify.h>
  34 #include <linux/ptp_clock_kernel.h>
  35
  36 #include "dp83640_reg.h"
  37
  38 #define DP83640_PHY_ID  0x20005ce1
  39 #define PAGESEL         0x13
  40 #define MAX_RXTS        64
  41 #define N_EXT_TS        6
  42 #define N_PER_OUT       7
  43 #define PSF_PTPVER      2
  44 #define PSF_EVNT        0x4000
  45 #define PSF_RX          0x2000
  46 #define PSF_TX          0x1000
  47 #define EXT_EVENT       1
  48 #define CAL_EVENT       7
  49 #define CAL_TRIGGER     1
  50 #define DP83640_N_PINS  12
  51
  52 #define MII_DP83640_MICR 0x11
  53 #define MII_DP83640_MISR 0x12
  54
  55 #define MII_DP83640_MICR_OE 0x1
  56 #define MII_DP83640_MICR_IE 0x2
  57
  58 #define MII_DP83640_MISR_RHF_INT_EN 0x01
  59 #define MII_DP83640_MISR_FHF_INT_EN 0x02
  60 #define MII_DP83640_MISR_ANC_INT_EN 0x04
  61 #define MII_DP83640_MISR_DUP_INT_EN 0x08
  62 #define MII_DP83640_MISR_SPD_INT_EN 0x10
  63 #define MII_DP83640_MISR_LINK_INT_EN 0x20
  64 #define MII_DP83640_MISR_ED_INT_EN 0x40
  65 #define MII_DP83640_MISR_LQ_INT_EN 0x80
  66
  67 /* phyter seems to miss the mark by 16 ns */
  68 #define ADJTIME_FIX     16
  69
  70 #define SKB_TIMESTAMP_TIMEOUT   2 /* jiffies */
  71
  72 #if defined(__BIG_ENDIAN)
  73 #define ENDIAN_FLAG     0
  74 #elif defined(__LITTLE_ENDIAN)
  75 #define ENDIAN_FLAG     PSF_ENDIAN
  76 #endif
  77
  78 struct dp83640_skb_info {
  79         int ptp_type;
  80         unsigned long tmo;
  81 };
  82
  83 struct phy_rxts {
  84         u16 ns_lo;   /* ns[15:0] */
  85         u16 ns_hi;   /* overflow[1:0], ns[29:16] */
  86         u16 sec_lo;  /* sec[15:0] */
  87         u16 sec_hi;  /* sec[31:16] */
  88         u16 seqid;   /* sequenceId[15:0] */
  89         u16 msgtype; /* messageType[3:0], hash[11:0] */
  90 };
  91
  92 struct phy_txts {
  93         u16 ns_lo;   /* ns[15:0] */
  94         u16 ns_hi;   /* overflow[1:0], ns[29:16] */
  95         u16 sec_lo;  /* sec[15:0] */
  96         u16 sec_hi;  /* sec[31:16] */
  97 };
  98
  99 struct rxts {
 100         struct list_head list;
 101         unsigned long tmo;
 102         u64 ns;
 103         u16 seqid;
 104         u8  msgtype;
 105         u16 hash;
 106 };
 107
 108 struct dp83640_clock;
 109
 110 struct dp83640_private {
 111         struct list_head list;
 112         struct dp83640_clock *clock;
 113         struct phy_device *phydev;
 114         struct delayed_work ts_work;
 115         int hwts_tx_en;
 116         int hwts_rx_en;
 117         int layer;
 118         int version;
 119         /* remember state of cfg0 during calibration */
 120         int cfg0;
 121         /* remember the last event time stamp */
 122         struct phy_txts edata;
 123         /* list of rx timestamps */
 124         struct list_head rxts;
 125         struct list_head rxpool;
 126         struct rxts rx_pool_data[MAX_RXTS];
 127         /* protects above three fields from concurrent access */
 128         spinlock_t rx_lock;
 129         /* queues of incoming and outgoing packets */
 130         struct sk_buff_head rx_queue;
 131         struct sk_buff_head tx_queue;
 132 };
 133
 134 struct dp83640_clock {
 135         /* keeps the instance in the 'phyter_clocks' list */
 136         struct list_head list;
 137         /* we create one clock instance per MII bus */
 138         struct mii_bus *bus;
 139         /* protects extended registers from concurrent access */
 140         struct mutex extreg_lock;
 141         /* remembers which page was last selected */
 142         int page;
 143         /* our advertised capabilities */
 144         struct ptp_clock_info caps;
 145         /* protects the three fields below from concurrent access */
 146         struct mutex clock_lock;
 147         /* the one phyter from which we shall read */
 148         struct dp83640_private *chosen;
 149         /* list of the other attached phyters, not chosen */
 150         struct list_head phylist;
 151         /* reference to our PTP hardware clock */
 152         struct ptp_clock *ptp_clock;
 153 };
 154
 155 /* globals */
 156
 157 enum {
 158         CALIBRATE_GPIO,
 159         PEROUT_GPIO,
 160         EXTTS0_GPIO,
 161         EXTTS1_GPIO,
 162         EXTTS2_GPIO,
 163         EXTTS3_GPIO,
 164         EXTTS4_GPIO,
 165         EXTTS5_GPIO,
 166         GPIO_TABLE_SIZE
 167 };
 168
 169 static int chosen_phy = -1;
 170 static ushort gpio_tab[GPIO_TABLE_SIZE] = {
 171         1, 2, 3, 4, 8, 9, 10, 11
 172 };
 173
 174 module_param(chosen_phy, int, 0444);
 175 module_param_array(gpio_tab, ushort, NULL, 0444);
 176
 177 MODULE_PARM_DESC(chosen_phy, \
 178         "The address of the PHY to use for the ancillary clock features");
 179 MODULE_PARM_DESC(gpio_tab, \
 180         "Which GPIO line to use for which purpose: cal,perout,extts1,...,extts6");
 181
 182 static void dp83640_gpio_defaults(struct ptp_pin_desc *pd)
 183 {
 184         int i, index;
 185
 186         for (i = 0; i < DP83640_N_PINS; i++) {
 187                 snprintf(pd[i].name, sizeof(pd[i].name), "GPIO%d", 1 + i);
 188                 pd[i].index = i;
 189         }
 190
 191         for (i = 0; i < GPIO_TABLE_SIZE; i++) {
 192                 if (gpio_tab[i] < 1 || gpio_tab[i] > DP83640_N_PINS) {
 193                         pr_err("gpio_tab[%d]=%hu out of range", i, gpio_tab[i]);
 194                         return;
 195                 }
 196         }
 197
 198         index = gpio_tab[CALIBRATE_GPIO] - 1;
 199         pd[index].func = PTP_PF_PHYSYNC;
 200         pd[index].chan = 0;
 201
 202         index = gpio_tab[PEROUT_GPIO] - 1;
 203         pd[index].func = PTP_PF_PEROUT;
 204         pd[index].chan = 0;
 205
 206         for (i = EXTTS0_GPIO; i < GPIO_TABLE_SIZE; i++) {
 207                 index = gpio_tab[i] - 1;
 208                 pd[index].func = PTP_PF_EXTTS;
 209                 pd[index].chan = i - EXTTS0_GPIO;
 210         }
 211 }
 212
 213 /* a list of clocks and a mutex to protect it */
 214 static LIST_HEAD(phyter_clocks);
 215 static DEFINE_MUTEX(phyter_clocks_lock);
 216
 217 static void rx_timestamp_work(struct work_struct *work);
 218
 219 /* extended register access functions */
 220
 221 #define BROADCAST_ADDR 31
 222
 223 static inline int broadcast_write(struct phy_device *phydev, u32 regnum,
 224                                   u16 val)
 225 {
 226         return mdiobus_write(phydev->mdio.bus, BROADCAST_ADDR, regnum, val);
 227 }
 228
 229 /* Caller must hold extreg_lock. */
 230 static int ext_read(struct phy_device *phydev, int page, u32 regnum)
 231 {
 232         struct dp83640_private *dp83640 = phydev->priv;
 233         int val;
 234
 235         if (dp83640->clock->page != page) {
 236                 broadcast_write(phydev, PAGESEL, page);
 237                 dp83640->clock->page = page;
 238         }
 239         val = phy_read(phydev, regnum);
 240
 241         return val;
 242 }
 243
 244 /* Caller must hold extreg_lock. */
 245 static void ext_write(int broadcast, struct phy_device *phydev,
 246                       int page, u32 regnum, u16 val)
 247 {
 248         struct dp83640_private *dp83640 = phydev->priv;
 249
 250         if (dp83640->clock->page != page) {
 251                 broadcast_write(phydev, PAGESEL, page);
 252                 dp83640->clock->page = page;
 253         }
 254         if (broadcast)
 255                 broadcast_write(phydev, regnum, val);
 256         else
 257                 phy_write(phydev, regnum, val);
 258 }
 259
 260 /* Caller must hold extreg_lock. */
 261 static int tdr_write(int bc, struct phy_device *dev,
 262                      const struct timespec64 *ts, u16 cmd)
 263 {
 264         ext_write(bc, dev, PAGE4, PTP_TDR, ts->tv_nsec & 0xffff);/* ns[15:0]  */
 265         ext_write(bc, dev, PAGE4, PTP_TDR, ts->tv_nsec >> 16);   /* ns[31:16] */
 266         ext_write(bc, dev, PAGE4, PTP_TDR, ts->tv_sec & 0xffff); /* sec[15:0] */
 267         ext_write(bc, dev, PAGE4, PTP_TDR, ts->tv_sec >> 16);    /* sec[31:16]*/
 268
 269         ext_write(bc, dev, PAGE4, PTP_CTL, cmd);
 270
 271         return 0;
 272 }
 273
 274 /* convert phy timestamps into driver timestamps */
 275
 276 static void phy2rxts(struct phy_rxts *p, struct rxts *rxts)
 277 {
 278         u32 sec;
 279
 280         sec = p->sec_lo;
 281         sec |= p->sec_hi << 16;
 282
 283         rxts->ns = p->ns_lo;
 284         rxts->ns |= (p->ns_hi & 0x3fff) << 16;
 285         rxts->ns += ((u64)sec) * 1000000000ULL;
 286         rxts->seqid = p->seqid;
 287         rxts->msgtype = (p->msgtype >> 12) & 0xf;
 288         rxts->hash = p->msgtype & 0x0fff;
 289         rxts->tmo = jiffies + SKB_TIMESTAMP_TIMEOUT;
 290 }
 291
 292 static u64 phy2txts(struct phy_txts *p)
 293 {
 294         u64 ns;
 295         u32 sec;
 296
 297         sec = p->sec_lo;
 298         sec |= p->sec_hi << 16;
 299
 300         ns = p->ns_lo;
 301         ns |= (p->ns_hi & 0x3fff) << 16;
 302         ns += ((u64)sec) * 1000000000ULL;
 303
 304         return ns;
 305 }
 306
 307 static int periodic_output(struct dp83640_clock *clock,
 308                            struct ptp_clock_request *clkreq, bool on,
 309                            int trigger)
 310 {
 311         struct dp83640_private *dp83640 = clock->chosen;
 312         struct phy_device *phydev = dp83640->phydev;
 313         u32 sec, nsec, pwidth;
 314         u16 gpio, ptp_trig, val;
 315
 316         if (on) {
 317                 gpio = 1 + ptp_find_pin(clock->ptp_clock, PTP_PF_PEROUT,
 318                                         trigger);
 319                 if (gpio < 1)
 320                         return -EINVAL;
 321         } else {
 322                 gpio = 0;
 323         }
 324
 325         ptp_trig = TRIG_WR |
 326                 (trigger & TRIG_CSEL_MASK) << TRIG_CSEL_SHIFT |
 327                 (gpio & TRIG_GPIO_MASK) << TRIG_GPIO_SHIFT |
 328                 TRIG_PER |
 329                 TRIG_PULSE;
 330
 331         val = (trigger & TRIG_SEL_MASK) << TRIG_SEL_SHIFT;
 332
 333         if (!on) {
 334                 val |= TRIG_DIS;
 335                 mutex_lock(&clock->extreg_lock);
 336                 ext_write(0, phydev, PAGE5, PTP_TRIG, ptp_trig);
 337                 ext_write(0, phydev, PAGE4, PTP_CTL, val);
 338                 mutex_unlock(&clock->extreg_lock);
 339                 return 0;
 340         }
 341
 342         sec = clkreq->perout.start.sec;
 343         nsec = clkreq->perout.start.nsec;
 344         pwidth = clkreq->perout.period.sec * 1000000000UL;
 345         pwidth += clkreq->perout.period.nsec;
 346         pwidth /= 2;
 347
 348         mutex_lock(&clock->extreg_lock);
 349
 350         ext_write(0, phydev, PAGE5, PTP_TRIG, ptp_trig);
 351
 352         /*load trigger*/
 353         val |= TRIG_LOAD;
 354         ext_write(0, phydev, PAGE4, PTP_CTL, val);
 355         ext_write(0, phydev, PAGE4, PTP_TDR, nsec & 0xffff);   /* ns[15:0] */
 356         ext_write(0, phydev, PAGE4, PTP_TDR, nsec >> 16);      /* ns[31:16] */
 357         ext_write(0, phydev, PAGE4, PTP_TDR, sec & 0xffff);    /* sec[15:0] */
 358         ext_write(0, phydev, PAGE4, PTP_TDR, sec >> 16);       /* sec[31:16] */
 359         ext_write(0, phydev, PAGE4, PTP_TDR, pwidth & 0xffff); /* ns[15:0] */
 360         ext_write(0, phydev, PAGE4, PTP_TDR, pwidth >> 16);    /* ns[31:16] */
 361         /* Triggers 0 and 1 has programmable pulsewidth2 */
 362         if (trigger < 2) {
 363                 ext_write(0, phydev, PAGE4, PTP_TDR, pwidth & 0xffff);
 364                 ext_write(0, phydev, PAGE4, PTP_TDR, pwidth >> 16);
 365         }
 366
 367         /*enable trigger*/
 368         val &= ~TRIG_LOAD;
 369         val |= TRIG_EN;
 370         ext_write(0, phydev, PAGE4, PTP_CTL, val);
 371
 372         mutex_unlock(&clock->extreg_lock);
 373         return 0;
 374 }
 375
 376 /* ptp clock methods */
 377
 378 static int ptp_dp83640_adjfreq(struct ptp_clock_info *ptp, s32 ppb)
 379 {
 380         struct dp83640_clock *clock =
 381                 container_of(ptp, struct dp83640_clock, caps);
 382         struct phy_device *phydev = clock->chosen->phydev;
 383         u64 rate;
 384         int neg_adj = 0;
 385         u16 hi, lo;
 386
 387         if (ppb < 0) {
 388                 neg_adj = 1;
 389                 ppb = -ppb;
 390         }
 391         rate = ppb;
 392         rate <<= 26;
 393         rate = div_u64(rate, 1953125);
 394
 395         hi = (rate >> 16) & PTP_RATE_HI_MASK;
 396         if (neg_adj)
 397                 hi |= PTP_RATE_DIR;
 398
 399         lo = rate & 0xffff;
 400
 401         mutex_lock(&clock->extreg_lock);
 402
 403         ext_write(1, phydev, PAGE4, PTP_RATEH, hi);
 404         ext_write(1, phydev, PAGE4, PTP_RATEL, lo);
 405
 406         mutex_unlock(&clock->extreg_lock);
 407
 408         return 0;
 409 }
 410
 411 static int ptp_dp83640_adjtime(struct ptp_clock_info *ptp, s64 delta)
 412 {
 413         struct dp83640_clock *clock =
 414                 container_of(ptp, struct dp83640_clock, caps);
 415         struct phy_device *phydev = clock->chosen->phydev;
 416         struct timespec64 ts;
 417         int err;
 418
 419         delta += ADJTIME_FIX;
 420
 421         ts = ns_to_timespec64(delta);
 422
 423         mutex_lock(&clock->extreg_lock);
 424
 425         err = tdr_write(1, phydev, &ts, PTP_STEP_CLK);
 426
 427         mutex_unlock(&clock->extreg_lock);
 428
 429         return err;
 430 }
 431
 432 static int ptp_dp83640_gettime(struct ptp_clock_info *ptp,
 433                                struct timespec64 *ts)
 434 {
 435         struct dp83640_clock *clock =
 436                 container_of(ptp, struct dp83640_clock, caps);
 437         struct phy_device *phydev = clock->chosen->phydev;
 438         unsigned int val[4];
 439
 440         mutex_lock(&clock->extreg_lock);
 441
 442         ext_write(0, phydev, PAGE4, PTP_CTL, PTP_RD_CLK);
 443
 444         val[0] = ext_read(phydev, PAGE4, PTP_TDR); /* ns[15:0] */
 445         val[1] = ext_read(phydev, PAGE4, PTP_TDR); /* ns[31:16] */
 446         val[2] = ext_read(phydev, PAGE4, PTP_TDR); /* sec[15:0] */
 447         val[3] = ext_read(phydev, PAGE4, PTP_TDR); /* sec[31:16] */
 448
 449         mutex_unlock(&clock->extreg_lock);
 450
 451         ts->tv_nsec = val[0] | (val[1] << 16);
 452         ts->tv_sec  = val[2] | (val[3] << 16);
 453
 454         return 0;
 455 }
 456
 457 static int ptp_dp83640_settime(struct ptp_clock_info *ptp,
 458                                const struct timespec64 *ts)
 459 {
 460         struct dp83640_clock *clock =
 461                 container_of(ptp, struct dp83640_clock, caps);
 462         struct phy_device *phydev = clock->chosen->phydev;
 463         int err;
 464
 465         mutex_lock(&clock->extreg_lock);
 466
 467         err = tdr_write(1, phydev, ts, PTP_LOAD_CLK);
 468
 469         mutex_unlock(&clock->extreg_lock);
 470
 471         return err;
 472 }
 473
 474 static int ptp_dp83640_enable(struct ptp_clock_info *ptp,
 475                               struct ptp_clock_request *rq, int on)
 476 {
 477         struct dp83640_clock *clock =
 478                 container_of(ptp, struct dp83640_clock, caps);
 479         struct phy_device *phydev = clock->chosen->phydev;
 480         unsigned int index;
 481         u16 evnt, event_num, gpio_num;
 482
 483         switch (rq->type) {
 484         case PTP_CLK_REQ_EXTTS:
 485                 index = rq->extts.index;
 486                 if (index >= N_EXT_TS)
 487                         return -EINVAL;
 488                 event_num = EXT_EVENT + index;
 489                 evnt = EVNT_WR | (event_num & EVNT_SEL_MASK) << EVNT_SEL_SHIFT;
 490                 if (on) {
 491                         gpio_num = 1 + ptp_find_pin(clock->ptp_clock,
 492                                                     PTP_PF_EXTTS, index);
 493                         if (gpio_num < 1)
 494                                 return -EINVAL;
 495                         evnt |= (gpio_num & EVNT_GPIO_MASK) << EVNT_GPIO_SHIFT;
 496                         if (rq->extts.flags & PTP_FALLING_EDGE)
 497                                 evnt |= EVNT_FALL;
 498                         else
 499                                 evnt |= EVNT_RISE;
 500                 }
 501                 mutex_lock(&clock->extreg_lock);
 502                 ext_write(0, phydev, PAGE5, PTP_EVNT, evnt);
 503                 mutex_unlock(&clock->extreg_lock);
 504                 return 0;
 505
 506         case PTP_CLK_REQ_PEROUT:
 507                 if (rq->perout.index >= N_PER_OUT)
 508                         return -EINVAL;
 509                 return periodic_output(clock, rq, on, rq->perout.index);
 510
 511         default:
 512                 break;
 513         }
 514
 515         return -EOPNOTSUPP;
 516 }
 517
 518 static int ptp_dp83640_verify(struct ptp_clock_info *ptp, unsigned int pin,
 519                               enum ptp_pin_function func, unsigned int chan)
 520 {
 521         struct dp83640_clock *clock =
 522                 container_of(ptp, struct dp83640_clock, caps);
 523
 524         if (clock->caps.pin_config[pin].func == PTP_PF_PHYSYNC &&
 525             !list_empty(&clock->phylist))
 526                 return 1;
 527
 528         if (func == PTP_PF_PHYSYNC)
 529                 return 1;
 530
 531         return 0;
 532 }
 533
 534 static u8 status_frame_dst[6] = { 0x01, 0x1B, 0x19, 0x00, 0x00, 0x00 };
 535 static u8 status_frame_src[6] = { 0x08, 0x00, 0x17, 0x0B, 0x6B, 0x0F };
 536
 537 static void enable_status_frames(struct phy_device *phydev, bool on)
 538 {
 539         struct dp83640_private *dp83640 = phydev->priv;
 540         struct dp83640_clock *clock = dp83640->clock;
 541         u16 cfg0 = 0, ver;
 542
 543         if (on)
 544                 cfg0 = PSF_EVNT_EN | PSF_RXTS_EN | PSF_TXTS_EN | ENDIAN_FLAG;
 545
 546         ver = (PSF_PTPVER & VERSIONPTP_MASK) << VERSIONPTP_SHIFT;
 547
 548         mutex_lock(&clock->extreg_lock);
 549
 550         ext_write(0, phydev, PAGE5, PSF_CFG0, cfg0);
 551         ext_write(0, phydev, PAGE6, PSF_CFG1, ver);
 552
 553         mutex_unlock(&clock->extreg_lock);
 554
 555         if (!phydev->attached_dev) {
 556                 pr_warn("expected to find an attached netdevice\n");
 557                 return;
 558         }
 559
 560         if (on) {
 561                 if (dev_mc_add(phydev->attached_dev, status_frame_dst))
 562                         pr_warn("failed to add mc address\n");
 563         } else {
 564                 if (dev_mc_del(phydev->attached_dev, status_frame_dst))
 565                         pr_warn("failed to delete mc address\n");
 566         }
 567 }
 568
 569 static bool is_status_frame(struct sk_buff *skb, int type)
 570 {
 571         struct ethhdr *h = eth_hdr(skb);
 572
 573         if (PTP_CLASS_V2_L2 == type &&
 574             !memcmp(h->h_source, status_frame_src, sizeof(status_frame_src)))
 575                 return true;
 576         else
 577                 return false;
 578 }
 579
 580 static int expired(struct rxts *rxts)
 581 {
 582         return time_after(jiffies, rxts->tmo);
 583 }
 584
 585 /* Caller must hold rx_lock. */
 586 static void prune_rx_ts(struct dp83640_private *dp83640)
 587 {
 588         struct list_head *this, *next;
 589         struct rxts *rxts;
 590
 591         list_for_each_safe(this, next, &dp83640->rxts) {
 592                 rxts = list_entry(this, struct rxts, list);
 593                 if (expired(rxts)) {
 594                         list_del_init(&rxts->list);
 595                         list_add(&rxts->list, &dp83640->rxpool);
 596                 }
 597         }
 598 }
 599
 600 /* synchronize the phyters so they act as one clock */
 601
 602 static void enable_broadcast(struct phy_device *phydev, int init_page, int on)
 603 {
 604         int val;
 605         phy_write(phydev, PAGESEL, 0);
 606         val = phy_read(phydev, PHYCR2);
 607         if (on)
 608                 val |= BC_WRITE;
 609         else
 610                 val &= ~BC_WRITE;
 611         phy_write(phydev, PHYCR2, val);
 612         phy_write(phydev, PAGESEL, init_page);
 613 }
 614
 615 static void recalibrate(struct dp83640_clock *clock)
 616 {
 617         s64 now, diff;
 618         struct phy_txts event_ts;
 619         struct timespec64 ts;
 620         struct list_head *this;
 621         struct dp83640_private *tmp;
 622         struct phy_device *master = clock->chosen->phydev;
 623         u16 cal_gpio, cfg0, evnt, ptp_trig, trigger, val;
 624
 625         trigger = CAL_TRIGGER;
 626         cal_gpio = 1 + ptp_find_pin(clock->ptp_clock, PTP_PF_PHYSYNC, 0);
 627         if (cal_gpio < 1) {
 628                 pr_err("PHY calibration pin not available - PHY is not calibrated.");
 629                 return;
 630         }
 631
 632         mutex_lock(&clock->extreg_lock);
 633
 634         /*
 635          * enable broadcast, disable status frames, enable ptp clock
 636          */
 637         list_for_each(this, &clock->phylist) {
 638                 tmp = list_entry(this, struct dp83640_private, list);
 639                 enable_broadcast(tmp->phydev, clock->page, 1);
 640                 tmp->cfg0 = ext_read(tmp->phydev, PAGE5, PSF_CFG0);
 641                 ext_write(0, tmp->phydev, PAGE5, PSF_CFG0, 0);
 642                 ext_write(0, tmp->phydev, PAGE4, PTP_CTL, PTP_ENABLE);
 643         }
 644         enable_broadcast(master, clock->page, 1);
 645         cfg0 = ext_read(master, PAGE5, PSF_CFG0);
 646         ext_write(0, master, PAGE5, PSF_CFG0, 0);
 647         ext_write(0, master, PAGE4, PTP_CTL, PTP_ENABLE);
 648
 649         /*
 650          * enable an event timestamp
 651          */
 652         evnt = EVNT_WR | EVNT_RISE | EVNT_SINGLE;
 653         evnt |= (CAL_EVENT & EVNT_SEL_MASK) << EVNT_SEL_SHIFT;
 654         evnt |= (cal_gpio & EVNT_GPIO_MASK) << EVNT_GPIO_SHIFT;
 655
 656         list_for_each(this, &clock->phylist) {
 657                 tmp = list_entry(this, struct dp83640_private, list);
 658                 ext_write(0, tmp->phydev, PAGE5, PTP_EVNT, evnt);
 659         }
 660         ext_write(0, master, PAGE5, PTP_EVNT, evnt);
 661
 662         /*
 663          * configure a trigger
 664          */
 665         ptp_trig = TRIG_WR | TRIG_IF_LATE | TRIG_PULSE;
 666         ptp_trig |= (trigger  & TRIG_CSEL_MASK) << TRIG_CSEL_SHIFT;
 667         ptp_trig |= (cal_gpio & TRIG_GPIO_MASK) << TRIG_GPIO_SHIFT;
 668         ext_write(0, master, PAGE5, PTP_TRIG, ptp_trig);
 669
 670         /* load trigger */
 671         val = (trigger & TRIG_SEL_MASK) << TRIG_SEL_SHIFT;
 672         val |= TRIG_LOAD;
 673         ext_write(0, master, PAGE4, PTP_CTL, val);
 674
 675         /* enable trigger */
 676         val &= ~TRIG_LOAD;
 677         val |= TRIG_EN;
 678         ext_write(0, master, PAGE4, PTP_CTL, val);
 679
 680         /* disable trigger */
 681         val = (trigger & TRIG_SEL_MASK) << TRIG_SEL_SHIFT;
 682         val |= TRIG_DIS;
 683         ext_write(0, master, PAGE4, PTP_CTL, val);
 684
 685         /*
 686          * read out and correct offsets
 687          */
 688         val = ext_read(master, PAGE4, PTP_STS);
 689         pr_info("master PTP_STS  0x%04hx\n", val);
 690         val = ext_read(master, PAGE4, PTP_ESTS);
 691         pr_info("master PTP_ESTS 0x%04hx\n", val);
 692         event_ts.ns_lo  = ext_read(master, PAGE4, PTP_EDATA);
 693         event_ts.ns_hi  = ext_read(master, PAGE4, PTP_EDATA);
 694         event_ts.sec_lo = ext_read(master, PAGE4, PTP_EDATA);
 695         event_ts.sec_hi = ext_read(master, PAGE4, PTP_EDATA);
 696         now = phy2txts(&event_ts);
 697
 698         list_for_each(this, &clock->phylist) {
 699                 tmp = list_entry(this, struct dp83640_private, list);
 700                 val = ext_read(tmp->phydev, PAGE4, PTP_STS);
 701                 pr_info("slave  PTP_STS  0x%04hx\n", val);
 702                 val = ext_read(tmp->phydev, PAGE4, PTP_ESTS);
 703                 pr_info("slave  PTP_ESTS 0x%04hx\n", val);
 704                 event_ts.ns_lo  = ext_read(tmp->phydev, PAGE4, PTP_EDATA);
 705                 event_ts.ns_hi  = ext_read(tmp->phydev, PAGE4, PTP_EDATA);
 706                 event_ts.sec_lo = ext_read(tmp->phydev, PAGE4, PTP_EDATA);
 707                 event_ts.sec_hi = ext_read(tmp->phydev, PAGE4, PTP_EDATA);
 708                 diff = now - (s64) phy2txts(&event_ts);
 709                 pr_info("slave offset %lld nanoseconds\n", diff);
 710                 diff += ADJTIME_FIX;
 711                 ts = ns_to_timespec64(diff);
 712                 tdr_write(0, tmp->phydev, &ts, PTP_STEP_CLK);
 713         }
 714
 715         /*
 716          * restore status frames
 717          */
 718         list_for_each(this, &clock->phylist) {
 719                 tmp = list_entry(this, struct dp83640_private, list);
 720                 ext_write(0, tmp->phydev, PAGE5, PSF_CFG0, tmp->cfg0);
 721         }
 722         ext_write(0, master, PAGE5, PSF_CFG0, cfg0);
 723
 724         mutex_unlock(&clock->extreg_lock);
 725 }
 726
 727 /* time stamping methods */
 728
 729 static inline u16 exts_chan_to_edata(int ch)
 730 {
 731         return 1 << ((ch + EXT_EVENT) * 2);
 732 }
 733
 734 static int decode_evnt(struct dp83640_private *dp83640,
 735                        void *data, int len, u16 ests)
 736 {
 737         struct phy_txts *phy_txts;
 738         struct ptp_clock_event event;
 739         int i, parsed;
 740         int words = (ests >> EVNT_TS_LEN_SHIFT) & EVNT_TS_LEN_MASK;
 741         u16 ext_status = 0;
 742
 743         /* calculate length of the event timestamp status message */
 744         if (ests & MULT_EVNT)
 745                 parsed = (words + 2) * sizeof(u16);
 746         else
 747                 parsed = (words + 1) * sizeof(u16);
 748
 749         /* check if enough data is available */
 750         if (len < parsed)
 751                 return len;
 752
 753         if (ests & MULT_EVNT) {
 754                 ext_status = *(u16 *) data;
 755                 data += sizeof(ext_status);
 756         }
 757
 758         phy_txts = data;
 759
 760         switch (words) { /* fall through in every case */
 761         case 3:
 762                 dp83640->edata.sec_hi = phy_txts->sec_hi;
 763         case 2:
 764                 dp83640->edata.sec_lo = phy_txts->sec_lo;
 765         case 1:
 766                 dp83640->edata.ns_hi = phy_txts->ns_hi;
 767         case 0:
 768                 dp83640->edata.ns_lo = phy_txts->ns_lo;
 769         }
 770
 771         if (!ext_status) {
 772                 i = ((ests >> EVNT_NUM_SHIFT) & EVNT_NUM_MASK) - EXT_EVENT;
 773                 ext_status = exts_chan_to_edata(i);
 774         }
 775
 776         event.type = PTP_CLOCK_EXTTS;
 777         event.timestamp = phy2txts(&dp83640->edata);
 778
 779         /* Compensate for input path and synchronization delays */
 780         event.timestamp -= 35;
 781
 782         for (i = 0; i < N_EXT_TS; i++) {
 783                 if (ext_status & exts_chan_to_edata(i)) {
 784                         event.index = i;
 785                         ptp_clock_event(dp83640->clock->ptp_clock, &event);
 786                 }
 787         }
 788
 789         return parsed;
 790 }
 791
 792 #define DP83640_PACKET_HASH_OFFSET      20
 793 #define DP83640_PACKET_HASH_LEN         10
 794
 795 static int match(struct sk_buff *skb, unsigned int type, struct rxts *rxts)
 796 {
 797         u16 *seqid, hash;
 798         unsigned int offset = 0;
 799         u8 *msgtype, *data = skb_mac_header(skb);
 800
 801         /* check sequenceID, messageType, 12 bit hash of offset 20-29 */
 802
 803         if (type & PTP_CLASS_VLAN)
 804                 offset += VLAN_HLEN;
 805
 806         switch (type & PTP_CLASS_PMASK) {
 807         case PTP_CLASS_IPV4:
 808                 offset += ETH_HLEN + IPV4_HLEN(data + offset) + UDP_HLEN;
 809                 break;
 810         case PTP_CLASS_IPV6:
 811                 offset += ETH_HLEN + IP6_HLEN + UDP_HLEN;
 812                 break;
 813         case PTP_CLASS_L2:
 814                 offset += ETH_HLEN;
 815                 break;
 816         default:
 817                 return 0;
 818         }
 819
 820         if (skb->len + ETH_HLEN < offset + OFF_PTP_SEQUENCE_ID + sizeof(*seqid))
 821                 return 0;
 822
 823         if (unlikely(type & PTP_CLASS_V1))
 824                 msgtype = data + offset + OFF_PTP_CONTROL;
 825         else
 826                 msgtype = data + offset;
 827         if (rxts->msgtype != (*msgtype & 0xf))
 828                 return 0;
 829
 830         seqid = (u16 *)(data + offset + OFF_PTP_SEQUENCE_ID);
 831         if (rxts->seqid != ntohs(*seqid))
 832                 return 0;
 833
 834         hash = ether_crc(DP83640_PACKET_HASH_LEN,
 835                          data + offset + DP83640_PACKET_HASH_OFFSET) >> 20;
 836         if (rxts->hash != hash)
 837                 return 0;
 838
 839         return 1;
 840 }
 841
 842 static void decode_rxts(struct dp83640_private *dp83640,
 843                         struct phy_rxts *phy_rxts)
 844 {
 845         struct rxts *rxts;
 846         struct skb_shared_hwtstamps *shhwtstamps = NULL;
 847         struct sk_buff *skb;
 848         unsigned long flags;
 849
 850         spin_lock_irqsave(&dp83640->rx_lock, flags);
 851
 852         prune_rx_ts(dp83640);
 853
 854         if (list_empty(&dp83640->rxpool)) {
 855                 pr_debug("rx timestamp pool is empty\n");
 856                 goto out;
 857         }
 858         rxts = list_first_entry(&dp83640->rxpool, struct rxts, list);
 859         list_del_init(&rxts->list);
 860         phy2rxts(phy_rxts, rxts);
 861
 862         spin_lock(&dp83640->rx_queue.lock);
 863         skb_queue_walk(&dp83640->rx_queue, skb) {
 864                 struct dp83640_skb_info *skb_info;
 865
 866                 skb_info = (struct dp83640_skb_info *)skb->cb;
 867                 if (match(skb, skb_info->ptp_type, rxts)) {
 868                         __skb_unlink(skb, &dp83640->rx_queue);
 869                         shhwtstamps = skb_hwtstamps(skb);
 870                         memset(shhwtstamps, 0, sizeof(*shhwtstamps));
 871                         shhwtstamps->hwtstamp = ns_to_ktime(rxts->ns);
 872                         netif_rx_ni(skb);
 873                         list_add(&rxts->list, &dp83640->rxpool);
 874                         break;
 875                 }
 876         }
 877         spin_unlock(&dp83640->rx_queue.lock);
 878
 879         if (!shhwtstamps)
 880                 list_add_tail(&rxts->list, &dp83640->rxts);
 881 out:
 882         spin_unlock_irqrestore(&dp83640->rx_lock, flags);
 883 }
 884
 885 static void decode_txts(struct dp83640_private *dp83640,
 886                         struct phy_txts *phy_txts)
 887 {
 888         struct skb_shared_hwtstamps shhwtstamps;
 889         struct sk_buff *skb;
 890         u64 ns;
 891
 892         /* We must already have the skb that triggered this. */
 893
 894         skb = skb_dequeue(&dp83640->tx_queue);
 895
 896         if (!skb) {
 897                 pr_debug("have timestamp but tx_queue empty\n");
 898                 return;
 899         }
 900         ns = phy2txts(phy_txts);
 901         memset(&shhwtstamps, 0, sizeof(shhwtstamps));
 902         shhwtstamps.hwtstamp = ns_to_ktime(ns);
 903         skb_complete_tx_timestamp(skb, &shhwtstamps);
 904 }
 905
 906 static void decode_status_frame(struct dp83640_private *dp83640,
 907                                 struct sk_buff *skb)
 908 {
 909         struct phy_rxts *phy_rxts;
 910         struct phy_txts *phy_txts;
 911         u8 *ptr;
 912         int len, size;
 913         u16 ests, type;
 914
 915         ptr = skb->data + 2;
 916
 917         for (len = skb_headlen(skb) - 2; len > sizeof(type); len -= size) {
 918
 919                 type = *(u16 *)ptr;
 920                 ests = type & 0x0fff;
 921                 type = type & 0xf000;
 922                 len -= sizeof(type);
 923                 ptr += sizeof(type);
 924
 925                 if (PSF_RX == type && len >= sizeof(*phy_rxts)) {
 926
 927                         phy_rxts = (struct phy_rxts *) ptr;
 928                         decode_rxts(dp83640, phy_rxts);
 929                         size = sizeof(*phy_rxts);
 930
 931                 } else if (PSF_TX == type && len >= sizeof(*phy_txts)) {
 932
 933                         phy_txts = (struct phy_txts *) ptr;
 934                         decode_txts(dp83640, phy_txts);
 935                         size = sizeof(*phy_txts);
 936
 937                 } else if (PSF_EVNT == type) {
 938
 939                         size = decode_evnt(dp83640, ptr, len, ests);
 940
 941                 } else {
 942                         size = 0;
 943                         break;
 944                 }
 945                 ptr += size;
 946         }
 947 }
 948
 949 static int is_sync(struct sk_buff *skb, int type)
 950 {
 951         u8 *data = skb->data, *msgtype;
 952         unsigned int offset = 0;
 953
 954         if (type & PTP_CLASS_VLAN)
 955                 offset += VLAN_HLEN;
 956
 957         switch (type & PTP_CLASS_PMASK) {
 958         case PTP_CLASS_IPV4:
 959                 offset += ETH_HLEN + IPV4_HLEN(data + offset) + UDP_HLEN;
 960                 break;
 961         case PTP_CLASS_IPV6:
 962                 offset += ETH_HLEN + IP6_HLEN + UDP_HLEN;
 963                 break;
 964         case PTP_CLASS_L2:
 965                 offset += ETH_HLEN;
 966                 break;
 967         default:
 968                 return 0;
 969         }
 970
 971         if (type & PTP_CLASS_V1)
 972                 offset += OFF_PTP_CONTROL;
 973
 974         if (skb->len < offset + 1)
 975                 return 0;
 976
 977         msgtype = data + offset;
 978
 979         return (*msgtype & 0xf) == 0;
 980 }
 981
 982 static void dp83640_free_clocks(void)
 983 {
 984         struct dp83640_clock *clock;
 985         struct list_head *this, *next;
 986
 987         mutex_lock(&phyter_clocks_lock);
 988
 989         list_for_each_safe(this, next, &phyter_clocks) {
 990                 clock = list_entry(this, struct dp83640_clock, list);
 991                 if (!list_empty(&clock->phylist)) {
 992                         pr_warn("phy list non-empty while unloading\n");
 993                         BUG();
 994                 }
 995                 list_del(&clock->list);
 996                 mutex_destroy(&clock->extreg_lock);
 997                 mutex_destroy(&clock->clock_lock);
 998                 put_device(&clock->bus->dev);
 999                 kfree(clock->caps.pin_config);
1000                 kfree(clock);
1001         }
1002
1003         mutex_unlock(&phyter_clocks_lock);
1004 }
1005
1006 static void dp83640_clock_init(struct dp83640_clock *clock, struct mii_bus *bus)
1007 {
1008         INIT_LIST_HEAD(&clock->list);
1009         clock->bus = bus;
1010         mutex_init(&clock->extreg_lock);
1011         mutex_init(&clock->clock_lock);
1012         INIT_LIST_HEAD(&clock->phylist);
1013         clock->caps.owner = THIS_MODULE;
1014         sprintf(clock->caps.name, "dp83640 timer");
1015         clock->caps.max_adj     = 1953124;
1016         clock->caps.n_alarm     = 0;
1017         clock->caps.n_ext_ts    = N_EXT_TS;
1018         clock->caps.n_per_out   = N_PER_OUT;
1019         clock->caps.n_pins      = DP83640_N_PINS;
1020         clock->caps.pps         = 0;
1021         clock->caps.adjfreq     = ptp_dp83640_adjfreq;
1022         clock->caps.adjtime     = ptp_dp83640_adjtime;
1023         clock->caps.gettime64   = ptp_dp83640_gettime;
1024         clock->caps.settime64   = ptp_dp83640_settime;
1025         clock->caps.enable      = ptp_dp83640_enable;
1026         clock->caps.verify      = ptp_dp83640_verify;
1027         /*
1028          * Convert the module param defaults into a dynamic pin configuration.
1029          */
1030         dp83640_gpio_defaults(clock->caps.pin_config);
1031         /*
1032          * Get a reference to this bus instance.
1033          */
1034         get_device(&bus->dev);
1035 }
1036
1037 static int choose_this_phy(struct dp83640_clock *clock,
1038                            struct phy_device *phydev)
1039 {
1040         if (chosen_phy == -1 && !clock->chosen)
1041                 return 1;
1042
1043         if (chosen_phy == phydev->mdio.addr)
1044                 return 1;
1045
1046         return 0;
1047 }
1048
1049 static struct dp83640_clock *dp83640_clock_get(struct dp83640_clock *clock)
1050 {
1051         if (clock)
1052                 mutex_lock(&clock->clock_lock);
1053         return clock;
1054 }
1055
1056 /*
1057  * Look up and lock a clock by bus instance.
1058  * If there is no clock for this bus, then create it first.
1059  */
1060 static struct dp83640_clock *dp83640_clock_get_bus(struct mii_bus *bus)
1061 {
1062         struct dp83640_clock *clock = NULL, *tmp;
1063         struct list_head *this;
1064
1065         mutex_lock(&phyter_clocks_lock);
1066
1067         list_for_each(this, &phyter_clocks) {
1068                 tmp = list_entry(this, struct dp83640_clock, list);
1069                 if (tmp->bus == bus) {
1070                         clock = tmp;
1071                         break;
1072                 }
1073         }
1074         if (clock)
1075                 goto out;
1076
1077         clock = kzalloc(sizeof(struct dp83640_clock), GFP_KERNEL);
1078         if (!clock)
1079                 goto out;
1080
1081         clock->caps.pin_config = kzalloc(sizeof(struct ptp_pin_desc) *
1082                                          DP83640_N_PINS, GFP_KERNEL);
1083         if (!clock->caps.pin_config) {
1084                 kfree(clock);
1085                 clock = NULL;
1086                 goto out;
1087         }
1088         dp83640_clock_init(clock, bus);
1089         list_add_tail(&phyter_clocks, &clock->list);
1090 out:
1091         mutex_unlock(&phyter_clocks_lock);
1092
1093         return dp83640_clock_get(clock);
1094 }
1095
1096 static void dp83640_clock_put(struct dp83640_clock *clock)
1097 {
1098         mutex_unlock(&clock->clock_lock);
1099 }
1100
1101 static int dp83640_probe(struct phy_device *phydev)
1102 {
1103         struct dp83640_clock *clock;
1104         struct dp83640_private *dp83640;
1105         int err = -ENOMEM, i;
1106
1107         if (phydev->mdio.addr == BROADCAST_ADDR)
1108                 return 0;
1109
1110         clock = dp83640_clock_get_bus(phydev->mdio.bus);
1111         if (!clock)
1112                 goto no_clock;
1113
1114         dp83640 = kzalloc(sizeof(struct dp83640_private), GFP_KERNEL);
1115         if (!dp83640)
1116                 goto no_memory;
1117
1118         dp83640->phydev = phydev;
1119         INIT_DELAYED_WORK(&dp83640->ts_work, rx_timestamp_work);
1120
1121         INIT_LIST_HEAD(&dp83640->rxts);
1122         INIT_LIST_HEAD(&dp83640->rxpool);
1123         for (i = 0; i < MAX_RXTS; i++)
1124                 list_add(&dp83640->rx_pool_data[i].list, &dp83640->rxpool);
1125
1126         phydev->priv = dp83640;
1127
1128         spin_lock_init(&dp83640->rx_lock);
1129         skb_queue_head_init(&dp83640->rx_queue);
1130         skb_queue_head_init(&dp83640->tx_queue);
1131
1132         dp83640->clock = clock;
1133
1134         if (choose_this_phy(clock, phydev)) {
1135                 clock->chosen = dp83640;
1136                 clock->ptp_clock = ptp_clock_register(&clock->caps,
1137                                                       &phydev->mdio.dev);
1138                 if (IS_ERR(clock->ptp_clock)) {
1139                         err = PTR_ERR(clock->ptp_clock);
1140                         goto no_register;
1141                 }
1142         } else
1143                 list_add_tail(&dp83640->list, &clock->phylist);
1144
1145         dp83640_clock_put(clock);
1146         return 0;
1147
1148 no_register:
1149         clock->chosen = NULL;
1150         kfree(dp83640);
1151 no_memory:
1152         dp83640_clock_put(clock);
1153 no_clock:
1154         return err;
1155 }
1156
1157 static void dp83640_remove(struct phy_device *phydev)
1158 {
1159         struct dp83640_clock *clock;
1160         struct list_head *this, *next;
1161         struct dp83640_private *tmp, *dp83640 = phydev->priv;
1162
1163         if (phydev->mdio.addr == BROADCAST_ADDR)
1164                 return;
1165
1166         enable_status_frames(phydev, false);
1167         cancel_delayed_work_sync(&dp83640->ts_work);
1168
1169         skb_queue_purge(&dp83640->rx_queue);
1170         skb_queue_purge(&dp83640->tx_queue);
1171
1172         clock = dp83640_clock_get(dp83640->clock);
1173
1174         if (dp83640 == clock->chosen) {
1175                 ptp_clock_unregister(clock->ptp_clock);
1176                 clock->chosen = NULL;
1177         } else {
1178                 list_for_each_safe(this, next, &clock->phylist) {
1179                         tmp = list_entry(this, struct dp83640_private, list);
1180                         if (tmp == dp83640) {
1181                                 list_del_init(&tmp->list);
1182                                 break;
1183                         }
1184                 }
1185         }
1186
1187         dp83640_clock_put(clock);
1188         kfree(dp83640);
1189 }
1190
1191 static int dp83640_config_init(struct phy_device *phydev)
1192 {
1193         struct dp83640_private *dp83640 = phydev->priv;
1194         struct dp83640_clock *clock = dp83640->clock;
1195
1196         if (clock->chosen && !list_empty(&clock->phylist))
1197                 recalibrate(clock);
1198         else {
1199                 mutex_lock(&clock->extreg_lock);
1200                 enable_broadcast(phydev, clock->page, 1);
1201                 mutex_unlock(&clock->extreg_lock);
1202         }
1203
1204         enable_status_frames(phydev, true);
1205
1206         mutex_lock(&clock->extreg_lock);
1207         ext_write(0, phydev, PAGE4, PTP_CTL, PTP_ENABLE);
1208         mutex_unlock(&clock->extreg_lock);
1209
1210         return 0;
1211 }
1212
1213 static int dp83640_ack_interrupt(struct phy_device *phydev)
1214 {
1215         int err = phy_read(phydev, MII_DP83640_MISR);
1216
1217         if (err < 0)
1218                 return err;
1219
1220         return 0;
1221 }
1222
1223 static int dp83640_config_intr(struct phy_device *phydev)
1224 {
1225         int micr;
1226         int misr;
1227         int err;
1228
1229         if (phydev->interrupts == PHY_INTERRUPT_ENABLED) {
1230                 misr = phy_read(phydev, MII_DP83640_MISR);
1231                 if (misr < 0)
1232                         return misr;
1233                 misr |=
1234                         (MII_DP83640_MISR_ANC_INT_EN |
1235                         MII_DP83640_MISR_DUP_INT_EN |
1236                         MII_DP83640_MISR_SPD_INT_EN |
1237                         MII_DP83640_MISR_LINK_INT_EN);
1238                 err = phy_write(phydev, MII_DP83640_MISR, misr);
1239                 if (err < 0)
1240                         return err;
1241
1242                 micr = phy_read(phydev, MII_DP83640_MICR);
1243                 if (micr < 0)
1244                         return micr;
1245                 micr |=
1246                         (MII_DP83640_MICR_OE |
1247                         MII_DP83640_MICR_IE);
1248                 return phy_write(phydev, MII_DP83640_MICR, micr);
1249         } else {
1250                 micr = phy_read(phydev, MII_DP83640_MICR);
1251                 if (micr < 0)
1252                         return micr;
1253                 micr &=
1254                         ~(MII_DP83640_MICR_OE |
1255                         MII_DP83640_MICR_IE);
1256                 err = phy_write(phydev, MII_DP83640_MICR, micr);
1257                 if (err < 0)
1258                         return err;
1259
1260                 misr = phy_read(phydev, MII_DP83640_MISR);
1261                 if (misr < 0)
1262                         return misr;
1263                 misr &=
1264                         ~(MII_DP83640_MISR_ANC_INT_EN |
1265                         MII_DP83640_MISR_DUP_INT_EN |
1266                         MII_DP83640_MISR_SPD_INT_EN |
1267                         MII_DP83640_MISR_LINK_INT_EN);
1268                 return phy_write(phydev, MII_DP83640_MISR, misr);
1269         }
1270 }
1271
1272 static int dp83640_hwtstamp(struct phy_device *phydev, struct ifreq *ifr)
1273 {
1274         struct dp83640_private *dp83640 = phydev->priv;
1275         struct hwtstamp_config cfg;
1276         u16 txcfg0, rxcfg0;
1277
1278         if (copy_from_user(&cfg, ifr->ifr_data, sizeof(cfg)))
1279                 return -EFAULT;
1280
1281         if (cfg.flags) /* reserved for future extensions */
1282                 return -EINVAL;
1283
1284         if (cfg.tx_type < 0 || cfg.tx_type > HWTSTAMP_TX_ONESTEP_SYNC)
1285                 return -ERANGE;
1286
1287         dp83640->hwts_tx_en = cfg.tx_type;
1288
1289         switch (cfg.rx_filter) {
1290         case HWTSTAMP_FILTER_NONE:
1291                 dp83640->hwts_rx_en = 0;
1292                 dp83640->layer = 0;
1293                 dp83640->version = 0;
1294                 break;
1295         case HWTSTAMP_FILTER_PTP_V1_L4_EVENT:
1296         case HWTSTAMP_FILTER_PTP_V1_L4_SYNC:
1297         case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ:
1298                 dp83640->hwts_rx_en = 1;
1299                 dp83640->layer = PTP_CLASS_L4;
1300                 dp83640->version = PTP_CLASS_V1;
1301                 break;
1302         case HWTSTAMP_FILTER_PTP_V2_L4_EVENT:
1303         case HWTSTAMP_FILTER_PTP_V2_L4_SYNC:
1304         case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ:
1305                 dp83640->hwts_rx_en = 1;
1306                 dp83640->layer = PTP_CLASS_L4;
1307                 dp83640->version = PTP_CLASS_V2;
1308                 break;
1309         case HWTSTAMP_FILTER_PTP_V2_L2_EVENT:
1310         case HWTSTAMP_FILTER_PTP_V2_L2_SYNC:
1311         case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ:
1312                 dp83640->hwts_rx_en = 1;
1313                 dp83640->layer = PTP_CLASS_L2;
1314                 dp83640->version = PTP_CLASS_V2;
1315                 break;
1316         case HWTSTAMP_FILTER_PTP_V2_EVENT:
1317         case HWTSTAMP_FILTER_PTP_V2_SYNC:
1318         case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ:
1319                 dp83640->hwts_rx_en = 1;
1320                 dp83640->layer = PTP_CLASS_L4 | PTP_CLASS_L2;
1321                 dp83640->version = PTP_CLASS_V2;
1322                 break;
1323         default:
1324                 return -ERANGE;
1325         }
1326
1327         txcfg0 = (dp83640->version & TX_PTP_VER_MASK) << TX_PTP_VER_SHIFT;
1328         rxcfg0 = (dp83640->version & TX_PTP_VER_MASK) << TX_PTP_VER_SHIFT;
1329
1330         if (dp83640->layer & PTP_CLASS_L2) {
1331                 txcfg0 |= TX_L2_EN;
1332                 rxcfg0 |= RX_L2_EN;
1333         }
1334         if (dp83640->layer & PTP_CLASS_L4) {
1335                 txcfg0 |= TX_IPV6_EN | TX_IPV4_EN;
1336                 rxcfg0 |= RX_IPV6_EN | RX_IPV4_EN;
1337         }
1338
1339         if (dp83640->hwts_tx_en)
1340                 txcfg0 |= TX_TS_EN;
1341
1342         if (dp83640->hwts_tx_en == HWTSTAMP_TX_ONESTEP_SYNC)
1343                 txcfg0 |= SYNC_1STEP | CHK_1STEP;
1344
1345         if (dp83640->hwts_rx_en)
1346                 rxcfg0 |= RX_TS_EN;
1347
1348         mutex_lock(&dp83640->clock->extreg_lock);
1349
1350         ext_write(0, phydev, PAGE5, PTP_TXCFG0, txcfg0);
1351         ext_write(0, phydev, PAGE5, PTP_RXCFG0, rxcfg0);
1352
1353         mutex_unlock(&dp83640->clock->extreg_lock);
1354
1355         return copy_to_user(ifr->ifr_data, &cfg, sizeof(cfg)) ? -EFAULT : 0;
1356 }
1357
1358 static void rx_timestamp_work(struct work_struct *work)
1359 {
1360         struct dp83640_private *dp83640 =
1361                 container_of(work, struct dp83640_private, ts_work.work);
1362         struct sk_buff *skb;
1363
1364         /* Deliver expired packets. */
1365         while ((skb = skb_dequeue(&dp83640->rx_queue))) {
1366                 struct dp83640_skb_info *skb_info;
1367
1368                 skb_info = (struct dp83640_skb_info *)skb->cb;
1369                 if (!time_after(jiffies, skb_info->tmo)) {
1370                         skb_queue_head(&dp83640->rx_queue, skb);
1371                         break;
1372                 }
1373
1374                 netif_rx_ni(skb);
1375         }
1376
1377         if (!skb_queue_empty(&dp83640->rx_queue))
1378                 schedule_delayed_work(&dp83640->ts_work, SKB_TIMESTAMP_TIMEOUT);
1379 }
1380
1381 static bool dp83640_rxtstamp(struct phy_device *phydev,
1382                              struct sk_buff *skb, int type)
1383 {
1384         struct dp83640_private *dp83640 = phydev->priv;
1385         struct dp83640_skb_info *skb_info = (struct dp83640_skb_info *)skb->cb;
1386         struct list_head *this, *next;
1387         struct rxts *rxts;
1388         struct skb_shared_hwtstamps *shhwtstamps = NULL;
1389         unsigned long flags;
1390
1391         if (is_status_frame(skb, type)) {
1392                 decode_status_frame(dp83640, skb);
1393                 kfree_skb(skb);
1394                 return true;
1395         }
1396
1397         if (!dp83640->hwts_rx_en)
1398                 return false;
1399
1400         if ((type & dp83640->version) == 0 || (type & dp83640->layer) == 0)
1401                 return false;
1402
1403         spin_lock_irqsave(&dp83640->rx_lock, flags);
1404         prune_rx_ts(dp83640);
1405         list_for_each_safe(this, next, &dp83640->rxts) {
1406                 rxts = list_entry(this, struct rxts, list);
1407                 if (match(skb, type, rxts)) {
1408                         shhwtstamps = skb_hwtstamps(skb);
1409                         memset(shhwtstamps, 0, sizeof(*shhwtstamps));
1410                         shhwtstamps->hwtstamp = ns_to_ktime(rxts->ns);
1411                         netif_rx_ni(skb);
1412                         list_del_init(&rxts->list);
1413                         list_add(&rxts->list, &dp83640->rxpool);
1414                         break;
1415                 }
1416         }
1417         spin_unlock_irqrestore(&dp83640->rx_lock, flags);
1418
1419         if (!shhwtstamps) {
1420                 skb_info->ptp_type = type;
1421                 skb_info->tmo = jiffies + SKB_TIMESTAMP_TIMEOUT;
1422                 skb_queue_tail(&dp83640->rx_queue, skb);
1423                 schedule_delayed_work(&dp83640->ts_work, SKB_TIMESTAMP_TIMEOUT);
1424         } else {
1425                 netif_rx_ni(skb);
1426         }
1427
1428         return true;
1429 }
1430
1431 static void dp83640_txtstamp(struct phy_device *phydev,
1432                              struct sk_buff *skb, int type)
1433 {
1434         struct dp83640_private *dp83640 = phydev->priv;
1435
1436         switch (dp83640->hwts_tx_en) {
1437
1438         case HWTSTAMP_TX_ONESTEP_SYNC:
1439                 if (is_sync(skb, type)) {
1440                         kfree_skb(skb);
1441                         return;
1442                 }
1443                 /* fall through */
1444         case HWTSTAMP_TX_ON:
1445                 skb_shinfo(skb)->tx_flags |= SKBTX_IN_PROGRESS;
1446                 skb_queue_tail(&dp83640->tx_queue, skb);
1447                 break;
1448
1449         case HWTSTAMP_TX_OFF:
1450         default:
1451                 kfree_skb(skb);
1452                 break;
1453         }
1454 }
1455
1456 static int dp83640_ts_info(struct phy_device *dev, struct ethtool_ts_info *info)
1457 {
1458         struct dp83640_private *dp83640 = dev->priv;
1459
1460         info->so_timestamping =
1461                 SOF_TIMESTAMPING_TX_HARDWARE |
1462                 SOF_TIMESTAMPING_RX_HARDWARE |
1463                 SOF_TIMESTAMPING_RAW_HARDWARE;
1464         info->phc_index = ptp_clock_index(dp83640->clock->ptp_clock);
1465         info->tx_types =
1466                 (1 << HWTSTAMP_TX_OFF) |
1467                 (1 << HWTSTAMP_TX_ON) |
1468                 (1 << HWTSTAMP_TX_ONESTEP_SYNC);
1469         info->rx_filters =
1470                 (1 << HWTSTAMP_FILTER_NONE) |
1471                 (1 << HWTSTAMP_FILTER_PTP_V1_L4_EVENT) |
1472                 (1 << HWTSTAMP_FILTER_PTP_V2_L4_EVENT) |
1473                 (1 << HWTSTAMP_FILTER_PTP_V2_L2_EVENT) |
1474                 (1 << HWTSTAMP_FILTER_PTP_V2_EVENT);
1475         return 0;
1476 }
1477
1478 static struct phy_driver dp83640_driver = {
1479         .phy_id         = DP83640_PHY_ID,
1480         .phy_id_mask    = 0xfffffff0,
1481         .name           = "NatSemi DP83640",
1482         .features       = PHY_BASIC_FEATURES,
1483         .flags          = PHY_HAS_INTERRUPT,
1484         .probe          = dp83640_probe,
1485         .remove         = dp83640_remove,
1486         .config_init    = dp83640_config_init,
1487         .config_aneg    = genphy_config_aneg,
1488         .read_status    = genphy_read_status,
1489         .ack_interrupt  = dp83640_ack_interrupt,
1490         .config_intr    = dp83640_config_intr,
1491         .ts_info        = dp83640_ts_info,
1492         .hwtstamp       = dp83640_hwtstamp,
1493         .rxtstamp       = dp83640_rxtstamp,
1494         .txtstamp       = dp83640_txtstamp,
1495 };
1496
1497 static int __init dp83640_init(void)
1498 {
1499         return phy_driver_register(&dp83640_driver, THIS_MODULE);
1500 }
1501
1502 static void __exit dp83640_exit(void)
1503 {
1504         dp83640_free_clocks();
1505         phy_driver_unregister(&dp83640_driver);
1506 }
1507
1508 MODULE_DESCRIPTION("National Semiconductor DP83640 PHY driver");
1509 MODULE_AUTHOR("Richard Cochran <richardcochran@gmail.com>");
1510 MODULE_LICENSE("GPL");
1511
1512 module_init(dp83640_init);
1513 module_exit(dp83640_exit);
1514
1515 static struct mdio_device_id __maybe_unused dp83640_tbl[] = {
1516         { DP83640_PHY_ID, 0xfffffff0 },
1517         { }
1518 };
1519
1520 MODULE_DEVICE_TABLE(mdio, dp83640_tbl);