drivers/ptp/ptp_ines.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 //
   3 // Copyright (C) 2018 MOSER-BAER AG
   4 //
   5
   6 #define pr_fmt(fmt) "InES_PTP: " fmt
   7
   8 #include <linux/ethtool.h>
   9 #include <linux/export.h>
  10 #include <linux/if_vlan.h>
  11 #include <linux/mii_timestamper.h>
  12 #include <linux/module.h>
  13 #include <linux/net_tstamp.h>
  14 #include <linux/of.h>
  15 #include <linux/of_address.h>
  16 #include <linux/of_irq.h>
  17 #include <linux/phy.h>
  18 #include <linux/platform_device.h>
  19 #include <linux/ptp_classify.h>
  20 #include <linux/ptp_clock_kernel.h>
  21 #include <linux/stddef.h>
  22
  23 MODULE_DESCRIPTION("Driver for the ZHAW InES PTP time stamping IP core");
  24 MODULE_AUTHOR("Richard Cochran <richardcochran@gmail.com>");
  25 MODULE_VERSION("1.0");
  26 MODULE_LICENSE("GPL");
  27
  28 /* GLOBAL register */
  29 #define MCAST_MAC_SELECT_SHIFT  2
  30 #define MCAST_MAC_SELECT_MASK   0x3
  31 #define IO_RESET                BIT(1)
  32 #define PTP_RESET               BIT(0)
  33
  34 /* VERSION register */
  35 #define IF_MAJOR_VER_SHIFT      12
  36 #define IF_MAJOR_VER_MASK       0xf
  37 #define IF_MINOR_VER_SHIFT      8
  38 #define IF_MINOR_VER_MASK       0xf
  39 #define FPGA_MAJOR_VER_SHIFT    4
  40 #define FPGA_MAJOR_VER_MASK     0xf
  41 #define FPGA_MINOR_VER_SHIFT    0
  42 #define FPGA_MINOR_VER_MASK     0xf
  43
  44 /* INT_STAT register */
  45 #define RX_INTR_STATUS_3        BIT(5)
  46 #define RX_INTR_STATUS_2        BIT(4)
  47 #define RX_INTR_STATUS_1        BIT(3)
  48 #define TX_INTR_STATUS_3        BIT(2)
  49 #define TX_INTR_STATUS_2        BIT(1)
  50 #define TX_INTR_STATUS_1        BIT(0)
  51
  52 /* INT_MSK register */
  53 #define RX_INTR_MASK_3          BIT(5)
  54 #define RX_INTR_MASK_2          BIT(4)
  55 #define RX_INTR_MASK_1          BIT(3)
  56 #define TX_INTR_MASK_3          BIT(2)
  57 #define TX_INTR_MASK_2          BIT(1)
  58 #define TX_INTR_MASK_1          BIT(0)
  59
  60 /* BUF_STAT register */
  61 #define RX_FIFO_NE_3            BIT(5)
  62 #define RX_FIFO_NE_2            BIT(4)
  63 #define RX_FIFO_NE_1            BIT(3)
  64 #define TX_FIFO_NE_3            BIT(2)
  65 #define TX_FIFO_NE_2            BIT(1)
  66 #define TX_FIFO_NE_1            BIT(0)
  67
  68 /* PORT_CONF register */
  69 #define CM_ONE_STEP             BIT(6)
  70 #define PHY_SPEED_SHIFT         4
  71 #define PHY_SPEED_MASK          0x3
  72 #define P2P_DELAY_WR_POS_SHIFT  2
  73 #define P2P_DELAY_WR_POS_MASK   0x3
  74 #define PTP_MODE_SHIFT          0
  75 #define PTP_MODE_MASK           0x3
  76
  77 /* TS_STAT_TX register */
  78 #define TS_ENABLE               BIT(15)
  79 #define DATA_READ_POS_SHIFT     8
  80 #define DATA_READ_POS_MASK      0x1f
  81 #define DISCARDED_EVENTS_SHIFT  4
  82 #define DISCARDED_EVENTS_MASK   0xf
  83
  84 #define INES_N_PORTS            3
  85 #define INES_REGISTER_SIZE      0x80
  86 #define INES_PORT_OFFSET        0x20
  87 #define INES_PORT_SIZE          0x20
  88 #define INES_FIFO_DEPTH         90
  89 #define INES_MAX_EVENTS         100
  90
  91 #define BC_PTP_V1               0
  92 #define BC_PTP_V2               1
  93 #define TC_E2E_PTP_V2           2
  94 #define TC_P2P_PTP_V2           3
  95
  96 #define PHY_SPEED_10            0
  97 #define PHY_SPEED_100           1
  98 #define PHY_SPEED_1000          2
  99
 100 #define PORT_CONF \
 101         ((PHY_SPEED_1000 << PHY_SPEED_SHIFT) | (BC_PTP_V2 << PTP_MODE_SHIFT))
 102
 103 #define ines_read32(s, r)       __raw_readl((void __iomem *)&s->regs->r)
 104 #define ines_write32(s, v, r)   __raw_writel(v, (void __iomem *)&s->regs->r)
 105
 106 #define MESSAGE_TYPE_SYNC               1
 107 #define MESSAGE_TYPE_P_DELAY_REQ        2
 108 #define MESSAGE_TYPE_P_DELAY_RESP       3
 109 #define MESSAGE_TYPE_DELAY_REQ          4
 110
 111 static LIST_HEAD(ines_clocks);
 112 static DEFINE_MUTEX(ines_clocks_lock);
 113
 114 struct ines_global_regs {
 115         u32 id;
 116         u32 test;
 117         u32 global;
 118         u32 version;
 119         u32 test2;
 120         u32 int_stat;
 121         u32 int_msk;
 122         u32 buf_stat;
 123 };
 124
 125 struct ines_port_registers {
 126         u32 port_conf;
 127         u32 p_delay;
 128         u32 ts_stat_tx;
 129         u32 ts_stat_rx;
 130         u32 ts_tx;
 131         u32 ts_rx;
 132 };
 133
 134 struct ines_timestamp {
 135         struct list_head list;
 136         unsigned long   tmo;
 137         u16             tag;
 138         u64             sec;
 139         u64             nsec;
 140         u64             clkid;
 141         u16             portnum;
 142         u16             seqid;
 143 };
 144
 145 struct ines_port {
 146         struct ines_port_registers      *regs;
 147         struct mii_timestamper          mii_ts;
 148         struct ines_clock               *clock;
 149         bool                            rxts_enabled;
 150         bool                            txts_enabled;
 151         unsigned int                    index;
 152         struct delayed_work             ts_work;
 153         /* lock protects event list and tx_skb */
 154         spinlock_t                      lock;
 155         struct sk_buff                  *tx_skb;
 156         struct list_head                events;
 157         struct list_head                pool;
 158         struct ines_timestamp           pool_data[INES_MAX_EVENTS];
 159 };
 160
 161 struct ines_clock {
 162         struct ines_port                port[INES_N_PORTS];
 163         struct ines_global_regs __iomem *regs;
 164         void __iomem                    *base;
 165         struct device_node              *node;
 166         struct device                   *dev;
 167         struct list_head                list;
 168 };
 169
 170 static bool ines_match(struct sk_buff *skb, unsigned int ptp_class,
 171                        struct ines_timestamp *ts, struct device *dev);
 172 static int ines_rxfifo_read(struct ines_port *port);
 173 static u64 ines_rxts64(struct ines_port *port, unsigned int words);
 174 static bool ines_timestamp_expired(struct ines_timestamp *ts);
 175 static u64 ines_txts64(struct ines_port *port, unsigned int words);
 176 static void ines_txtstamp_work(struct work_struct *work);
 177 static bool is_sync_pdelay_resp(struct sk_buff *skb, int type);
 178 static u8 tag_to_msgtype(u8 tag);
 179
 180 static void ines_clock_cleanup(struct ines_clock *clock)
 181 {
 182         struct ines_port *port;
 183         int i;
 184
 185         for (i = 0; i < INES_N_PORTS; i++) {
 186                 port = &clock->port[i];
 187                 cancel_delayed_work_sync(&port->ts_work);
 188         }
 189 }
 190
 191 static int ines_clock_init(struct ines_clock *clock, struct device *device,
 192                            void __iomem *addr)
 193 {
 194         struct device_node *node = device->of_node;
 195         unsigned long port_addr;
 196         struct ines_port *port;
 197         int i, j;
 198
 199         INIT_LIST_HEAD(&clock->list);
 200         clock->node = node;
 201         clock->dev  = device;
 202         clock->base = addr;
 203         clock->regs = clock->base;
 204
 205         for (i = 0; i < INES_N_PORTS; i++) {
 206                 port = &clock->port[i];
 207                 port_addr = (unsigned long) clock->base +
 208                         INES_PORT_OFFSET + i * INES_PORT_SIZE;
 209                 port->regs = (struct ines_port_registers *) port_addr;
 210                 port->clock = clock;
 211                 port->index = i;
 212                 INIT_DELAYED_WORK(&port->ts_work, ines_txtstamp_work);
 213                 spin_lock_init(&port->lock);
 214                 INIT_LIST_HEAD(&port->events);
 215                 INIT_LIST_HEAD(&port->pool);
 216                 for (j = 0; j < INES_MAX_EVENTS; j++)
 217                         list_add(&port->pool_data[j].list, &port->pool);
 218         }
 219
 220         ines_write32(clock, 0xBEEF, test);
 221         ines_write32(clock, 0xBEEF, test2);
 222
 223         dev_dbg(device, "ID      0x%x\n", ines_read32(clock, id));
 224         dev_dbg(device, "TEST    0x%x\n", ines_read32(clock, test));
 225         dev_dbg(device, "VERSION 0x%x\n", ines_read32(clock, version));
 226         dev_dbg(device, "TEST2   0x%x\n", ines_read32(clock, test2));
 227
 228         for (i = 0; i < INES_N_PORTS; i++) {
 229                 port = &clock->port[i];
 230                 ines_write32(port, PORT_CONF, port_conf);
 231         }
 232
 233         return 0;
 234 }
 235
 236 static struct ines_port *ines_find_port(struct device_node *node, u32 index)
 237 {
 238         struct ines_port *port = NULL;
 239         struct ines_clock *clock;
 240         struct list_head *this;
 241
 242         mutex_lock(&ines_clocks_lock);
 243         list_for_each(this, &ines_clocks) {
 244                 clock = list_entry(this, struct ines_clock, list);
 245                 if (clock->node == node) {
 246                         port = &clock->port[index];
 247                         break;
 248                 }
 249         }
 250         mutex_unlock(&ines_clocks_lock);
 251         return port;
 252 }
 253
 254 static u64 ines_find_rxts(struct ines_port *port, struct sk_buff *skb, int type)
 255 {
 256         struct list_head *this, *next;
 257         struct ines_timestamp *ts;
 258         unsigned long flags;
 259         u64 ns = 0;
 260
 261         if (type == PTP_CLASS_NONE)
 262                 return 0;
 263
 264         spin_lock_irqsave(&port->lock, flags);
 265         ines_rxfifo_read(port);
 266         list_for_each_safe(this, next, &port->events) {
 267                 ts = list_entry(this, struct ines_timestamp, list);
 268                 if (ines_timestamp_expired(ts)) {
 269                         list_del_init(&ts->list);
 270                         list_add(&ts->list, &port->pool);
 271                         continue;
 272                 }
 273                 if (ines_match(skb, type, ts, port->clock->dev)) {
 274                         ns = ts->sec * 1000000000ULL + ts->nsec;
 275                         list_del_init(&ts->list);
 276                         list_add(&ts->list, &port->pool);
 277                         break;
 278                 }
 279         }
 280         spin_unlock_irqrestore(&port->lock, flags);
 281
 282         return ns;
 283 }
 284
 285 static u64 ines_find_txts(struct ines_port *port, struct sk_buff *skb)
 286 {
 287         unsigned int class = ptp_classify_raw(skb), i;
 288         u32 data_rd_pos, buf_stat, mask, ts_stat_tx;
 289         struct ines_timestamp ts;
 290         unsigned long flags;
 291         u64 ns = 0;
 292
 293         mask = TX_FIFO_NE_1 << port->index;
 294
 295         spin_lock_irqsave(&port->lock, flags);
 296
 297         for (i = 0; i < INES_FIFO_DEPTH; i++) {
 298
 299                 buf_stat = ines_read32(port->clock, buf_stat);
 300                 if (!(buf_stat & mask)) {
 301                         dev_dbg(port->clock->dev,
 302                                   "Tx timestamp FIFO unexpectedly empty\n");
 303                         break;
 304                 }
 305                 ts_stat_tx = ines_read32(port, ts_stat_tx);
 306                 data_rd_pos = (ts_stat_tx >> DATA_READ_POS_SHIFT) &
 307                         DATA_READ_POS_MASK;
 308                 if (data_rd_pos) {
 309                         dev_err(port->clock->dev,
 310                                 "unexpected Tx read pos %u\n", data_rd_pos);
 311                         break;
 312                 }
 313
 314                 ts.tag     = ines_read32(port, ts_tx);
 315                 ts.sec     = ines_txts64(port, 3);
 316                 ts.nsec    = ines_txts64(port, 2);
 317                 ts.clkid   = ines_txts64(port, 4);
 318                 ts.portnum = ines_read32(port, ts_tx);
 319                 ts.seqid   = ines_read32(port, ts_tx);
 320
 321                 if (ines_match(skb, class, &ts, port->clock->dev)) {
 322                         ns = ts.sec * 1000000000ULL + ts.nsec;
 323                         break;
 324                 }
 325         }
 326
 327         spin_unlock_irqrestore(&port->lock, flags);
 328         return ns;
 329 }
 330
 331 static int ines_hwtstamp(struct mii_timestamper *mii_ts, struct ifreq *ifr)
 332 {
 333         struct ines_port *port = container_of(mii_ts, struct ines_port, mii_ts);
 334         u32 cm_one_step = 0, port_conf, ts_stat_rx, ts_stat_tx;
 335         struct hwtstamp_config cfg;
 336         unsigned long flags;
 337
 338         if (copy_from_user(&cfg, ifr->ifr_data, sizeof(cfg)))
 339                 return -EFAULT;
 340
 341         /* reserved for future extensions */
 342         if (cfg.flags)
 343                 return -EINVAL;
 344
 345         switch (cfg.tx_type) {
 346         case HWTSTAMP_TX_OFF:
 347                 ts_stat_tx = 0;
 348                 break;
 349         case HWTSTAMP_TX_ON:
 350                 ts_stat_tx = TS_ENABLE;
 351                 break;
 352         case HWTSTAMP_TX_ONESTEP_P2P:
 353                 ts_stat_tx = TS_ENABLE;
 354                 cm_one_step = CM_ONE_STEP;
 355                 break;
 356         default:
 357                 return -ERANGE;
 358         }
 359
 360         switch (cfg.rx_filter) {
 361         case HWTSTAMP_FILTER_NONE:
 362                 ts_stat_rx = 0;
 363                 break;
 364         case HWTSTAMP_FILTER_ALL:
 365         case HWTSTAMP_FILTER_PTP_V1_L4_EVENT:
 366         case HWTSTAMP_FILTER_PTP_V1_L4_SYNC:
 367         case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ:
 368                 return -ERANGE;
 369         case HWTSTAMP_FILTER_PTP_V2_L4_EVENT:
 370         case HWTSTAMP_FILTER_PTP_V2_L4_SYNC:
 371         case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ:
 372         case HWTSTAMP_FILTER_PTP_V2_L2_EVENT:
 373         case HWTSTAMP_FILTER_PTP_V2_L2_SYNC:
 374         case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ:
 375         case HWTSTAMP_FILTER_PTP_V2_EVENT:
 376         case HWTSTAMP_FILTER_PTP_V2_SYNC:
 377         case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ:
 378                 ts_stat_rx = TS_ENABLE;
 379                 cfg.rx_filter = HWTSTAMP_FILTER_PTP_V2_EVENT;
 380                 break;
 381         default:
 382                 return -ERANGE;
 383         }
 384
 385         spin_lock_irqsave(&port->lock, flags);
 386
 387         port_conf = ines_read32(port, port_conf);
 388         port_conf &= ~CM_ONE_STEP;
 389         port_conf |= cm_one_step;
 390
 391         ines_write32(port, port_conf, port_conf);
 392         ines_write32(port, ts_stat_rx, ts_stat_rx);
 393         ines_write32(port, ts_stat_tx, ts_stat_tx);
 394
 395         port->rxts_enabled = ts_stat_rx == TS_ENABLE;
 396         port->txts_enabled = ts_stat_tx == TS_ENABLE;
 397
 398         spin_unlock_irqrestore(&port->lock, flags);
 399
 400         return copy_to_user(ifr->ifr_data, &cfg, sizeof(cfg)) ? -EFAULT : 0;
 401 }
 402
 403 static void ines_link_state(struct mii_timestamper *mii_ts,
 404                             struct phy_device *phydev)
 405 {
 406         struct ines_port *port = container_of(mii_ts, struct ines_port, mii_ts);
 407         u32 port_conf, speed_conf;
 408         unsigned long flags;
 409
 410         switch (phydev->speed) {
 411         case SPEED_10:
 412                 speed_conf = PHY_SPEED_10 << PHY_SPEED_SHIFT;
 413                 break;
 414         case SPEED_100:
 415                 speed_conf = PHY_SPEED_100 << PHY_SPEED_SHIFT;
 416                 break;
 417         case SPEED_1000:
 418                 speed_conf = PHY_SPEED_1000 << PHY_SPEED_SHIFT;
 419                 break;
 420         default:
 421                 dev_err(port->clock->dev, "bad speed: %d\n", phydev->speed);
 422                 return;
 423         }
 424         spin_lock_irqsave(&port->lock, flags);
 425
 426         port_conf = ines_read32(port, port_conf);
 427         port_conf &= ~(0x3 << PHY_SPEED_SHIFT);
 428         port_conf |= speed_conf;
 429
 430         ines_write32(port, port_conf, port_conf);
 431
 432         spin_unlock_irqrestore(&port->lock, flags);
 433 }
 434
 435 static bool ines_match(struct sk_buff *skb, unsigned int ptp_class,
 436                        struct ines_timestamp *ts, struct device *dev)
 437 {
 438         struct ptp_header *hdr;
 439         u16 portn, seqid;
 440         u8 msgtype;
 441         u64 clkid;
 442
 443         if (unlikely(ptp_class & PTP_CLASS_V1))
 444                 return false;
 445
 446         hdr = ptp_parse_header(skb, ptp_class);
 447         if (!hdr)
 448                 return false;
 449
 450         msgtype = ptp_get_msgtype(hdr, ptp_class);
 451         clkid = be64_to_cpup((__be64 *)&hdr->source_port_identity.clock_identity.id[0]);
 452         portn = be16_to_cpu(hdr->source_port_identity.port_number);
 453         seqid = be16_to_cpu(hdr->sequence_id);
 454
 455         if (tag_to_msgtype(ts->tag & 0x7) != msgtype) {
 456                 dev_dbg(dev, "msgtype mismatch ts %hhu != skb %hhu\n",
 457                         tag_to_msgtype(ts->tag & 0x7), msgtype);
 458                 return false;
 459         }
 460         if (ts->clkid != clkid) {
 461                 dev_dbg(dev, "clkid mismatch ts %llx != skb %llx\n",
 462                         ts->clkid, clkid);
 463                 return false;
 464         }
 465         if (ts->portnum != portn) {
 466                 dev_dbg(dev, "portn mismatch ts %hu != skb %hu\n",
 467                         ts->portnum, portn);
 468                 return false;
 469         }
 470         if (ts->seqid != seqid) {
 471                 dev_dbg(dev, "seqid mismatch ts %hu != skb %hu\n",
 472                         ts->seqid, seqid);
 473                 return false;
 474         }
 475
 476         return true;
 477 }
 478
 479 static bool ines_rxtstamp(struct mii_timestamper *mii_ts,
 480                           struct sk_buff *skb, int type)
 481 {
 482         struct ines_port *port = container_of(mii_ts, struct ines_port, mii_ts);
 483         struct skb_shared_hwtstamps *ssh;
 484         u64 ns;
 485
 486         if (!port->rxts_enabled)
 487                 return false;
 488
 489         ns = ines_find_rxts(port, skb, type);
 490         if (!ns)
 491                 return false;
 492
 493         ssh = skb_hwtstamps(skb);
 494         ssh->hwtstamp = ns_to_ktime(ns);
 495         netif_rx(skb);
 496
 497         return true;
 498 }
 499
 500 static int ines_rxfifo_read(struct ines_port *port)
 501 {
 502         u32 data_rd_pos, buf_stat, mask, ts_stat_rx;
 503         struct ines_timestamp *ts;
 504         unsigned int i;
 505
 506         mask = RX_FIFO_NE_1 << port->index;
 507
 508         for (i = 0; i < INES_FIFO_DEPTH; i++) {
 509                 if (list_empty(&port->pool)) {
 510                         dev_err(port->clock->dev, "event pool is empty\n");
 511                         return -1;
 512                 }
 513                 buf_stat = ines_read32(port->clock, buf_stat);
 514                 if (!(buf_stat & mask))
 515                         break;
 516
 517                 ts_stat_rx = ines_read32(port, ts_stat_rx);
 518                 data_rd_pos = (ts_stat_rx >> DATA_READ_POS_SHIFT) &
 519                         DATA_READ_POS_MASK;
 520                 if (data_rd_pos) {
 521                         dev_err(port->clock->dev, "unexpected Rx read pos %u\n",
 522                                 data_rd_pos);
 523                         break;
 524                 }
 525
 526                 ts = list_first_entry(&port->pool, struct ines_timestamp, list);
 527                 ts->tmo     = jiffies + HZ;
 528                 ts->tag     = ines_read32(port, ts_rx);
 529                 ts->sec     = ines_rxts64(port, 3);
 530                 ts->nsec    = ines_rxts64(port, 2);
 531                 ts->clkid   = ines_rxts64(port, 4);
 532                 ts->portnum = ines_read32(port, ts_rx);
 533                 ts->seqid   = ines_read32(port, ts_rx);
 534
 535                 list_del_init(&ts->list);
 536                 list_add_tail(&ts->list, &port->events);
 537         }
 538
 539         return 0;
 540 }
 541
 542 static u64 ines_rxts64(struct ines_port *port, unsigned int words)
 543 {
 544         unsigned int i;
 545         u64 result;
 546         u16 word;
 547
 548         word = ines_read32(port, ts_rx);
 549         result = word;
 550         words--;
 551         for (i = 0; i < words; i++) {
 552                 word = ines_read32(port, ts_rx);
 553                 result <<= 16;
 554                 result |= word;
 555         }
 556         return result;
 557 }
 558
 559 static bool ines_timestamp_expired(struct ines_timestamp *ts)
 560 {
 561         return time_after(jiffies, ts->tmo);
 562 }
 563
 564 static int ines_ts_info(struct mii_timestamper *mii_ts,
 565                         struct ethtool_ts_info *info)
 566 {
 567         info->so_timestamping =
 568                 SOF_TIMESTAMPING_TX_HARDWARE |
 569                 SOF_TIMESTAMPING_TX_SOFTWARE |
 570                 SOF_TIMESTAMPING_RX_HARDWARE |
 571                 SOF_TIMESTAMPING_RX_SOFTWARE |
 572                 SOF_TIMESTAMPING_SOFTWARE |
 573                 SOF_TIMESTAMPING_RAW_HARDWARE;
 574
 575         info->phc_index = -1;
 576
 577         info->tx_types =
 578                 (1 << HWTSTAMP_TX_OFF) |
 579                 (1 << HWTSTAMP_TX_ON) |
 580                 (1 << HWTSTAMP_TX_ONESTEP_P2P);
 581
 582         info->rx_filters =
 583                 (1 << HWTSTAMP_FILTER_NONE) |
 584                 (1 << HWTSTAMP_FILTER_PTP_V2_EVENT);
 585
 586         return 0;
 587 }
 588
 589 static u64 ines_txts64(struct ines_port *port, unsigned int words)
 590 {
 591         unsigned int i;
 592         u64 result;
 593         u16 word;
 594
 595         word = ines_read32(port, ts_tx);
 596         result = word;
 597         words--;
 598         for (i = 0; i < words; i++) {
 599                 word = ines_read32(port, ts_tx);
 600                 result <<= 16;
 601                 result |= word;
 602         }
 603         return result;
 604 }
 605
 606 static bool ines_txts_onestep(struct ines_port *port, struct sk_buff *skb, int type)
 607 {
 608         unsigned long flags;
 609         u32 port_conf;
 610
 611         spin_lock_irqsave(&port->lock, flags);
 612         port_conf = ines_read32(port, port_conf);
 613         spin_unlock_irqrestore(&port->lock, flags);
 614
 615         if (port_conf & CM_ONE_STEP)
 616                 return is_sync_pdelay_resp(skb, type);
 617
 618         return false;
 619 }
 620
 621 static void ines_txtstamp(struct mii_timestamper *mii_ts,
 622                           struct sk_buff *skb, int type)
 623 {
 624         struct ines_port *port = container_of(mii_ts, struct ines_port, mii_ts);
 625         struct sk_buff *old_skb = NULL;
 626         unsigned long flags;
 627
 628         if (!port->txts_enabled || ines_txts_onestep(port, skb, type)) {
 629                 kfree_skb(skb);
 630                 return;
 631         }
 632
 633         spin_lock_irqsave(&port->lock, flags);
 634
 635         if (port->tx_skb)
 636                 old_skb = port->tx_skb;
 637
 638         port->tx_skb = skb;
 639
 640         spin_unlock_irqrestore(&port->lock, flags);
 641
 642         kfree_skb(old_skb);
 643
 644         schedule_delayed_work(&port->ts_work, 1);
 645 }
 646
 647 static void ines_txtstamp_work(struct work_struct *work)
 648 {
 649         struct ines_port *port =
 650                 container_of(work, struct ines_port, ts_work.work);
 651         struct skb_shared_hwtstamps ssh;
 652         struct sk_buff *skb;
 653         unsigned long flags;
 654         u64 ns;
 655
 656         spin_lock_irqsave(&port->lock, flags);
 657         skb = port->tx_skb;
 658         port->tx_skb = NULL;
 659         spin_unlock_irqrestore(&port->lock, flags);
 660
 661         ns = ines_find_txts(port, skb);
 662         if (!ns) {
 663                 kfree_skb(skb);
 664                 return;
 665         }
 666         ssh.hwtstamp = ns_to_ktime(ns);
 667         skb_complete_tx_timestamp(skb, &ssh);
 668 }
 669
 670 static bool is_sync_pdelay_resp(struct sk_buff *skb, int type)
 671 {
 672         struct ptp_header *hdr;
 673         u8 msgtype;
 674
 675         hdr = ptp_parse_header(skb, type);
 676         if (!hdr)
 677                 return false;
 678
 679         msgtype = ptp_get_msgtype(hdr, type);
 680
 681         switch (msgtype) {
 682         case PTP_MSGTYPE_SYNC:
 683         case PTP_MSGTYPE_PDELAY_RESP:
 684                 return true;
 685         default:
 686                 return false;
 687         }
 688 }
 689
 690 static u8 tag_to_msgtype(u8 tag)
 691 {
 692         switch (tag) {
 693         case MESSAGE_TYPE_SYNC:
 694                 return PTP_MSGTYPE_SYNC;
 695         case MESSAGE_TYPE_P_DELAY_REQ:
 696                 return PTP_MSGTYPE_PDELAY_REQ;
 697         case MESSAGE_TYPE_P_DELAY_RESP:
 698                 return PTP_MSGTYPE_PDELAY_RESP;
 699         case MESSAGE_TYPE_DELAY_REQ:
 700                 return PTP_MSGTYPE_DELAY_REQ;
 701         }
 702         return 0xf;
 703 }
 704
 705 static struct mii_timestamper *ines_ptp_probe_channel(struct device *device,
 706                                                       unsigned int index)
 707 {
 708         struct device_node *node = device->of_node;
 709         struct ines_port *port;
 710
 711         if (index > INES_N_PORTS - 1) {
 712                 dev_err(device, "bad port index %u\n", index);
 713                 return ERR_PTR(-EINVAL);
 714         }
 715         port = ines_find_port(node, index);
 716         if (!port) {
 717                 dev_err(device, "missing port index %u\n", index);
 718                 return ERR_PTR(-ENODEV);
 719         }
 720         port->mii_ts.rxtstamp = ines_rxtstamp;
 721         port->mii_ts.txtstamp = ines_txtstamp;
 722         port->mii_ts.hwtstamp = ines_hwtstamp;
 723         port->mii_ts.link_state = ines_link_state;
 724         port->mii_ts.ts_info = ines_ts_info;
 725
 726         return &port->mii_ts;
 727 }
 728
 729 static void ines_ptp_release_channel(struct device *device,
 730                                      struct mii_timestamper *mii_ts)
 731 {
 732 }
 733
 734 static struct mii_timestamping_ctrl ines_ctrl = {
 735         .probe_channel = ines_ptp_probe_channel,
 736         .release_channel = ines_ptp_release_channel,
 737 };
 738
 739 static int ines_ptp_ctrl_probe(struct platform_device *pld)
 740 {
 741         struct ines_clock *clock;
 742         void __iomem *addr;
 743         int err = 0;
 744
 745         addr = devm_platform_ioremap_resource(pld, 0);
 746         if (IS_ERR(addr)) {
 747                 err = PTR_ERR(addr);
 748                 goto out;
 749         }
 750         clock = kzalloc(sizeof(*clock), GFP_KERNEL);
 751         if (!clock) {
 752                 err = -ENOMEM;
 753                 goto out;
 754         }
 755         if (ines_clock_init(clock, &pld->dev, addr)) {
 756                 kfree(clock);
 757                 err = -ENOMEM;
 758                 goto out;
 759         }
 760         err = register_mii_tstamp_controller(&pld->dev, &ines_ctrl);
 761         if (err) {
 762                 kfree(clock);
 763                 goto out;
 764         }
 765         mutex_lock(&ines_clocks_lock);
 766         list_add_tail(&ines_clocks, &clock->list);
 767         mutex_unlock(&ines_clocks_lock);
 768
 769         dev_set_drvdata(&pld->dev, clock);
 770 out:
 771         return err;
 772 }
 773
 774 static int ines_ptp_ctrl_remove(struct platform_device *pld)
 775 {
 776         struct ines_clock *clock = dev_get_drvdata(&pld->dev);
 777
 778         unregister_mii_tstamp_controller(&pld->dev);
 779         mutex_lock(&ines_clocks_lock);
 780         list_del(&clock->list);
 781         mutex_unlock(&ines_clocks_lock);
 782         ines_clock_cleanup(clock);
 783         kfree(clock);
 784         return 0;
 785 }
 786
 787 static const struct of_device_id ines_ptp_ctrl_of_match[] = {
 788         { .compatible = "ines,ptp-ctrl" },
 789         { }
 790 };
 791
 792 MODULE_DEVICE_TABLE(of, ines_ptp_ctrl_of_match);
 793
 794 static struct platform_driver ines_ptp_ctrl_driver = {
 795         .probe  = ines_ptp_ctrl_probe,
 796         .remove = ines_ptp_ctrl_remove,
 797         .driver = {
 798                 .name = "ines_ptp_ctrl",
 799                 .of_match_table = of_match_ptr(ines_ptp_ctrl_of_match),
 800         },
 801 };
 802 module_platform_driver(ines_ptp_ctrl_driver);