drivers/net/ethernet/microchip/encx24j600.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Microchip ENCX24J600 ethernet driver
   4  *
   5  * Copyright (C) 2015 Gridpoint
   6  * Author: Jon Ringle <jringle@gridpoint.com>
   7  */
   8
   9 #include <linux/device.h>
  10 #include <linux/errno.h>
  11 #include <linux/etherdevice.h>
  12 #include <linux/ethtool.h>
  13 #include <linux/interrupt.h>
  14 #include <linux/kernel.h>
  15 #include <linux/module.h>
  16 #include <linux/netdevice.h>
  17 #include <linux/regmap.h>
  18 #include <linux/skbuff.h>
  19 #include <linux/spi/spi.h>
  20
  21 #include "encx24j600_hw.h"
  22
  23 #define DRV_NAME        "encx24j600"
  24 #define DRV_VERSION     "1.0"
  25
  26 #define DEFAULT_MSG_ENABLE (NETIF_MSG_DRV | NETIF_MSG_PROBE | NETIF_MSG_LINK)
  27 static int debug = -1;
  28 module_param(debug, int, 0000);
  29 MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)");
  30
  31 /* SRAM memory layout:
  32  *
  33  * 0x0000-0x05ff TX buffers  1.5KB  (1*1536) reside in the GP area in SRAM
  34  * 0x0600-0x5fff RX buffers 22.5KB (15*1536) reside in the RX area in SRAM
  35  */
  36 #define ENC_TX_BUF_START 0x0000U
  37 #define ENC_RX_BUF_START 0x0600U
  38 #define ENC_RX_BUF_END   0x5fffU
  39 #define ENC_SRAM_SIZE    0x6000U
  40
  41 enum {
  42         RXFILTER_NORMAL,
  43         RXFILTER_MULTI,
  44         RXFILTER_PROMISC
  45 };
  46
  47 struct encx24j600_priv {
  48         struct net_device        *ndev;
  49         struct mutex              lock; /* device access lock */
  50         struct encx24j600_context ctx;
  51         struct sk_buff           *tx_skb;
  52         struct task_struct       *kworker_task;
  53         struct kthread_worker     kworker;
  54         struct kthread_work       tx_work;
  55         struct kthread_work       setrx_work;
  56         u16                       next_packet;
  57         bool                      hw_enabled;
  58         bool                      full_duplex;
  59         bool                      autoneg;
  60         u16                       speed;
  61         int                       rxfilter;
  62         u32                       msg_enable;
  63 };
  64
  65 static void dump_packet(const char *msg, int len, const char *data)
  66 {
  67         pr_debug(DRV_NAME ": %s - packet len:%d\n", msg, len);
  68         print_hex_dump_bytes("pk data: ", DUMP_PREFIX_OFFSET, data, len);
  69 }
  70
  71 static void encx24j600_dump_rsv(struct encx24j600_priv *priv, const char *msg,
  72                                 struct rsv *rsv)
  73 {
  74         struct net_device *dev = priv->ndev;
  75
  76         netdev_info(dev, "RX packet Len:%d\n", rsv->len);
  77         netdev_dbg(dev, "%s - NextPk: 0x%04x\n", msg,
  78                    rsv->next_packet);
  79         netdev_dbg(dev, "RxOK: %d, DribbleNibble: %d\n",
  80                    RSV_GETBIT(rsv->rxstat, RSV_RXOK),
  81                    RSV_GETBIT(rsv->rxstat, RSV_DRIBBLENIBBLE));
  82         netdev_dbg(dev, "CRCErr:%d, LenChkErr: %d, LenOutOfRange: %d\n",
  83                    RSV_GETBIT(rsv->rxstat, RSV_CRCERROR),
  84                    RSV_GETBIT(rsv->rxstat, RSV_LENCHECKERR),
  85                    RSV_GETBIT(rsv->rxstat, RSV_LENOUTOFRANGE));
  86         netdev_dbg(dev, "Multicast: %d, Broadcast: %d, LongDropEvent: %d, CarrierEvent: %d\n",
  87                    RSV_GETBIT(rsv->rxstat, RSV_RXMULTICAST),
  88                    RSV_GETBIT(rsv->rxstat, RSV_RXBROADCAST),
  89                    RSV_GETBIT(rsv->rxstat, RSV_RXLONGEVDROPEV),
  90                    RSV_GETBIT(rsv->rxstat, RSV_CARRIEREV));
  91         netdev_dbg(dev, "ControlFrame: %d, PauseFrame: %d, UnknownOp: %d, VLanTagFrame: %d\n",
  92                    RSV_GETBIT(rsv->rxstat, RSV_RXCONTROLFRAME),
  93                    RSV_GETBIT(rsv->rxstat, RSV_RXPAUSEFRAME),
  94                    RSV_GETBIT(rsv->rxstat, RSV_RXUNKNOWNOPCODE),
  95                    RSV_GETBIT(rsv->rxstat, RSV_RXTYPEVLAN));
  96 }
  97
  98 static u16 encx24j600_read_reg(struct encx24j600_priv *priv, u8 reg)
  99 {
 100         struct net_device *dev = priv->ndev;
 101         unsigned int val = 0;
 102         int ret = regmap_read(priv->ctx.regmap, reg, &val);
 103
 104         if (unlikely(ret))
 105                 netif_err(priv, drv, dev, "%s: error %d reading reg %02x\n",
 106                           __func__, ret, reg);
 107         return val;
 108 }
 109
 110 static void encx24j600_write_reg(struct encx24j600_priv *priv, u8 reg, u16 val)
 111 {
 112         struct net_device *dev = priv->ndev;
 113         int ret = regmap_write(priv->ctx.regmap, reg, val);
 114
 115         if (unlikely(ret))
 116                 netif_err(priv, drv, dev, "%s: error %d writing reg %02x=%04x\n",
 117                           __func__, ret, reg, val);
 118 }
 119
 120 static void encx24j600_update_reg(struct encx24j600_priv *priv, u8 reg,
 121                                   u16 mask, u16 val)
 122 {
 123         struct net_device *dev = priv->ndev;
 124         int ret = regmap_update_bits(priv->ctx.regmap, reg, mask, val);
 125
 126         if (unlikely(ret))
 127                 netif_err(priv, drv, dev, "%s: error %d updating reg %02x=%04x~%04x\n",
 128                           __func__, ret, reg, val, mask);
 129 }
 130
 131 static u16 encx24j600_read_phy(struct encx24j600_priv *priv, u8 reg)
 132 {
 133         struct net_device *dev = priv->ndev;
 134         unsigned int val = 0;
 135         int ret = regmap_read(priv->ctx.phymap, reg, &val);
 136
 137         if (unlikely(ret))
 138                 netif_err(priv, drv, dev, "%s: error %d reading %02x\n",
 139                           __func__, ret, reg);
 140         return val;
 141 }
 142
 143 static void encx24j600_write_phy(struct encx24j600_priv *priv, u8 reg, u16 val)
 144 {
 145         struct net_device *dev = priv->ndev;
 146         int ret = regmap_write(priv->ctx.phymap, reg, val);
 147
 148         if (unlikely(ret))
 149                 netif_err(priv, drv, dev, "%s: error %d writing reg %02x=%04x\n",
 150                           __func__, ret, reg, val);
 151 }
 152
 153 static void encx24j600_clr_bits(struct encx24j600_priv *priv, u8 reg, u16 mask)
 154 {
 155         encx24j600_update_reg(priv, reg, mask, 0);
 156 }
 157
 158 static void encx24j600_set_bits(struct encx24j600_priv *priv, u8 reg, u16 mask)
 159 {
 160         encx24j600_update_reg(priv, reg, mask, mask);
 161 }
 162
 163 static void encx24j600_cmd(struct encx24j600_priv *priv, u8 cmd)
 164 {
 165         struct net_device *dev = priv->ndev;
 166         int ret = regmap_write(priv->ctx.regmap, cmd, 0);
 167
 168         if (unlikely(ret))
 169                 netif_err(priv, drv, dev, "%s: error %d with cmd %02x\n",
 170                           __func__, ret, cmd);
 171 }
 172
 173 static int encx24j600_raw_read(struct encx24j600_priv *priv, u8 reg, u8 *data,
 174                                size_t count)
 175 {
 176         int ret;
 177
 178         mutex_lock(&priv->ctx.mutex);
 179         ret = regmap_encx24j600_spi_read(&priv->ctx, reg, data, count);
 180         mutex_unlock(&priv->ctx.mutex);
 181
 182         return ret;
 183 }
 184
 185 static int encx24j600_raw_write(struct encx24j600_priv *priv, u8 reg,
 186                                 const u8 *data, size_t count)
 187 {
 188         int ret;
 189
 190         mutex_lock(&priv->ctx.mutex);
 191         ret = regmap_encx24j600_spi_write(&priv->ctx, reg, data, count);
 192         mutex_unlock(&priv->ctx.mutex);
 193
 194         return ret;
 195 }
 196
 197 static void encx24j600_update_phcon1(struct encx24j600_priv *priv)
 198 {
 199         u16 phcon1 = encx24j600_read_phy(priv, PHCON1);
 200
 201         if (priv->autoneg == AUTONEG_ENABLE) {
 202                 phcon1 |= ANEN | RENEG;
 203         } else {
 204                 phcon1 &= ~ANEN;
 205                 if (priv->speed == SPEED_100)
 206                         phcon1 |= SPD100;
 207                 else
 208                         phcon1 &= ~SPD100;
 209
 210                 if (priv->full_duplex)
 211                         phcon1 |= PFULDPX;
 212                 else
 213                         phcon1 &= ~PFULDPX;
 214         }
 215         encx24j600_write_phy(priv, PHCON1, phcon1);
 216 }
 217
 218 /* Waits for autonegotiation to complete. */
 219 static int encx24j600_wait_for_autoneg(struct encx24j600_priv *priv)
 220 {
 221         struct net_device *dev = priv->ndev;
 222         unsigned long timeout = jiffies + msecs_to_jiffies(2000);
 223         u16 phstat1;
 224         u16 estat;
 225
 226         phstat1 = encx24j600_read_phy(priv, PHSTAT1);
 227         while ((phstat1 & ANDONE) == 0) {
 228                 if (time_after(jiffies, timeout)) {
 229                         u16 phstat3;
 230
 231                         netif_notice(priv, drv, dev, "timeout waiting for autoneg done\n");
 232
 233                         priv->autoneg = AUTONEG_DISABLE;
 234                         phstat3 = encx24j600_read_phy(priv, PHSTAT3);
 235                         priv->speed = (phstat3 & PHY3SPD100)
 236                                       ? SPEED_100 : SPEED_10;
 237                         priv->full_duplex = (phstat3 & PHY3DPX) ? 1 : 0;
 238                         encx24j600_update_phcon1(priv);
 239                         netif_notice(priv, drv, dev, "Using parallel detection: %s/%s",
 240                                      priv->speed == SPEED_100 ? "100" : "10",
 241                                      priv->full_duplex ? "Full" : "Half");
 242
 243                         return -ETIMEDOUT;
 244                 }
 245                 cpu_relax();
 246                 phstat1 = encx24j600_read_phy(priv, PHSTAT1);
 247         }
 248
 249         estat = encx24j600_read_reg(priv, ESTAT);
 250         if (estat & PHYDPX) {
 251                 encx24j600_set_bits(priv, MACON2, FULDPX);
 252                 encx24j600_write_reg(priv, MABBIPG, 0x15);
 253         } else {
 254                 encx24j600_clr_bits(priv, MACON2, FULDPX);
 255                 encx24j600_write_reg(priv, MABBIPG, 0x12);
 256                 /* Max retransmittions attempt  */
 257                 encx24j600_write_reg(priv, MACLCON, 0x370f);
 258         }
 259
 260         return 0;
 261 }
 262
 263 /* Access the PHY to determine link status */
 264 static void encx24j600_check_link_status(struct encx24j600_priv *priv)
 265 {
 266         struct net_device *dev = priv->ndev;
 267         u16 estat;
 268
 269         estat = encx24j600_read_reg(priv, ESTAT);
 270
 271         if (estat & PHYLNK) {
 272                 if (priv->autoneg == AUTONEG_ENABLE)
 273                         encx24j600_wait_for_autoneg(priv);
 274
 275                 netif_carrier_on(dev);
 276                 netif_info(priv, ifup, dev, "link up\n");
 277         } else {
 278                 netif_info(priv, ifdown, dev, "link down\n");
 279
 280                 /* Re-enable autoneg since we won't know what we might be
 281                  * connected to when the link is brought back up again.
 282                  */
 283                 priv->autoneg  = AUTONEG_ENABLE;
 284                 priv->full_duplex = true;
 285                 priv->speed = SPEED_100;
 286                 netif_carrier_off(dev);
 287         }
 288 }
 289
 290 static void encx24j600_int_link_handler(struct encx24j600_priv *priv)
 291 {
 292         struct net_device *dev = priv->ndev;
 293
 294         netif_dbg(priv, intr, dev, "%s", __func__);
 295         encx24j600_check_link_status(priv);
 296         encx24j600_clr_bits(priv, EIR, LINKIF);
 297 }
 298
 299 static void encx24j600_tx_complete(struct encx24j600_priv *priv, bool err)
 300 {
 301         struct net_device *dev = priv->ndev;
 302
 303         if (!priv->tx_skb) {
 304                 BUG();
 305                 return;
 306         }
 307
 308         mutex_lock(&priv->lock);
 309
 310         if (err)
 311                 dev->stats.tx_errors++;
 312         else
 313                 dev->stats.tx_packets++;
 314
 315         dev->stats.tx_bytes += priv->tx_skb->len;
 316
 317         encx24j600_clr_bits(priv, EIR, TXIF | TXABTIF);
 318
 319         netif_dbg(priv, tx_done, dev, "TX Done%s\n", err ? ": Err" : "");
 320
 321         dev_kfree_skb(priv->tx_skb);
 322         priv->tx_skb = NULL;
 323
 324         netif_wake_queue(dev);
 325
 326         mutex_unlock(&priv->lock);
 327 }
 328
 329 static int encx24j600_receive_packet(struct encx24j600_priv *priv,
 330                                      struct rsv *rsv)
 331 {
 332         struct net_device *dev = priv->ndev;
 333         struct sk_buff *skb = netdev_alloc_skb(dev, rsv->len + NET_IP_ALIGN);
 334
 335         if (!skb) {
 336                 pr_err_ratelimited("RX: OOM: packet dropped\n");
 337                 dev->stats.rx_dropped++;
 338                 return -ENOMEM;
 339         }
 340         skb_reserve(skb, NET_IP_ALIGN);
 341         encx24j600_raw_read(priv, RRXDATA, skb_put(skb, rsv->len), rsv->len);
 342
 343         if (netif_msg_pktdata(priv))
 344                 dump_packet("RX", skb->len, skb->data);
 345
 346         skb->dev = dev;
 347         skb->protocol = eth_type_trans(skb, dev);
 348         skb->ip_summed = CHECKSUM_COMPLETE;
 349
 350         /* Maintain stats */
 351         dev->stats.rx_packets++;
 352         dev->stats.rx_bytes += rsv->len;
 353
 354         netif_rx(skb);
 355
 356         return 0;
 357 }
 358
 359 static void encx24j600_rx_packets(struct encx24j600_priv *priv, u8 packet_count)
 360 {
 361         struct net_device *dev = priv->ndev;
 362
 363         while (packet_count--) {
 364                 struct rsv rsv;
 365                 u16 newrxtail;
 366
 367                 encx24j600_write_reg(priv, ERXRDPT, priv->next_packet);
 368                 encx24j600_raw_read(priv, RRXDATA, (u8 *)&rsv, sizeof(rsv));
 369
 370                 if (netif_msg_rx_status(priv))
 371                         encx24j600_dump_rsv(priv, __func__, &rsv);
 372
 373                 if (!RSV_GETBIT(rsv.rxstat, RSV_RXOK) ||
 374                     (rsv.len > MAX_FRAMELEN)) {
 375                         netif_err(priv, rx_err, dev, "RX Error %04x\n",
 376                                   rsv.rxstat);
 377                         dev->stats.rx_errors++;
 378
 379                         if (RSV_GETBIT(rsv.rxstat, RSV_CRCERROR))
 380                                 dev->stats.rx_crc_errors++;
 381                         if (RSV_GETBIT(rsv.rxstat, RSV_LENCHECKERR))
 382                                 dev->stats.rx_frame_errors++;
 383                         if (rsv.len > MAX_FRAMELEN)
 384                                 dev->stats.rx_over_errors++;
 385                 } else {
 386                         encx24j600_receive_packet(priv, &rsv);
 387                 }
 388
 389                 priv->next_packet = rsv.next_packet;
 390
 391                 newrxtail = priv->next_packet - 2;
 392                 if (newrxtail == ENC_RX_BUF_START)
 393                         newrxtail = SRAM_SIZE - 2;
 394
 395                 encx24j600_cmd(priv, SETPKTDEC);
 396                 encx24j600_write_reg(priv, ERXTAIL, newrxtail);
 397         }
 398 }
 399
 400 static irqreturn_t encx24j600_isr(int irq, void *dev_id)
 401 {
 402         struct encx24j600_priv *priv = dev_id;
 403         struct net_device *dev = priv->ndev;
 404         int eir;
 405
 406         /* Clear interrupts */
 407         encx24j600_cmd(priv, CLREIE);
 408
 409         eir = encx24j600_read_reg(priv, EIR);
 410
 411         if (eir & LINKIF)
 412                 encx24j600_int_link_handler(priv);
 413
 414         if (eir & TXIF)
 415                 encx24j600_tx_complete(priv, false);
 416
 417         if (eir & TXABTIF)
 418                 encx24j600_tx_complete(priv, true);
 419
 420         if (eir & RXABTIF) {
 421                 if (eir & PCFULIF) {
 422                         /* Packet counter is full */
 423                         netif_err(priv, rx_err, dev, "Packet counter full\n");
 424                 }
 425                 dev->stats.rx_dropped++;
 426                 encx24j600_clr_bits(priv, EIR, RXABTIF);
 427         }
 428
 429         if (eir & PKTIF) {
 430                 u8 packet_count;
 431
 432                 mutex_lock(&priv->lock);
 433
 434                 packet_count = encx24j600_read_reg(priv, ESTAT) & 0xff;
 435                 while (packet_count) {
 436                         encx24j600_rx_packets(priv, packet_count);
 437                         packet_count = encx24j600_read_reg(priv, ESTAT) & 0xff;
 438                 }
 439
 440                 mutex_unlock(&priv->lock);
 441         }
 442
 443         /* Enable interrupts */
 444         encx24j600_cmd(priv, SETEIE);
 445
 446         return IRQ_HANDLED;
 447 }
 448
 449 static int encx24j600_soft_reset(struct encx24j600_priv *priv)
 450 {
 451         int ret = 0;
 452         int timeout;
 453         u16 eudast;
 454
 455         /* Write and verify a test value to EUDAST */
 456         regcache_cache_bypass(priv->ctx.regmap, true);
 457         timeout = 10;
 458         do {
 459                 encx24j600_write_reg(priv, EUDAST, EUDAST_TEST_VAL);
 460                 eudast = encx24j600_read_reg(priv, EUDAST);
 461                 usleep_range(25, 100);
 462         } while ((eudast != EUDAST_TEST_VAL) && --timeout);
 463         regcache_cache_bypass(priv->ctx.regmap, false);
 464
 465         if (timeout == 0) {
 466                 ret = -ETIMEDOUT;
 467                 goto err_out;
 468         }
 469
 470         /* Wait for CLKRDY to become set */
 471         timeout = 10;
 472         while (!(encx24j600_read_reg(priv, ESTAT) & CLKRDY) && --timeout)
 473                 usleep_range(25, 100);
 474
 475         if (timeout == 0) {
 476                 ret = -ETIMEDOUT;
 477                 goto err_out;
 478         }
 479
 480         /* Issue a System Reset command */
 481         encx24j600_cmd(priv, SETETHRST);
 482         usleep_range(25, 100);
 483
 484         /* Confirm that EUDAST has 0000h after system reset */
 485         if (encx24j600_read_reg(priv, EUDAST) != 0) {
 486                 ret = -EINVAL;
 487                 goto err_out;
 488         }
 489
 490         /* Wait for PHY register and status bits to become available */
 491         usleep_range(256, 1000);
 492
 493 err_out:
 494         return ret;
 495 }
 496
 497 static int encx24j600_hw_reset(struct encx24j600_priv *priv)
 498 {
 499         int ret;
 500
 501         mutex_lock(&priv->lock);
 502         ret = encx24j600_soft_reset(priv);
 503         mutex_unlock(&priv->lock);
 504
 505         return ret;
 506 }
 507
 508 static void encx24j600_reset_hw_tx(struct encx24j600_priv *priv)
 509 {
 510         encx24j600_set_bits(priv, ECON2, TXRST);
 511         encx24j600_clr_bits(priv, ECON2, TXRST);
 512 }
 513
 514 static void encx24j600_hw_init_tx(struct encx24j600_priv *priv)
 515 {
 516         /* Reset TX */
 517         encx24j600_reset_hw_tx(priv);
 518
 519         /* Clear the TXIF flag if were previously set */
 520         encx24j600_clr_bits(priv, EIR, TXIF | TXABTIF);
 521
 522         /* Write the Tx Buffer pointer */
 523         encx24j600_write_reg(priv, EGPWRPT, ENC_TX_BUF_START);
 524 }
 525
 526 static void encx24j600_hw_init_rx(struct encx24j600_priv *priv)
 527 {
 528         encx24j600_cmd(priv, DISABLERX);
 529
 530         /* Set up RX packet start address in the SRAM */
 531         encx24j600_write_reg(priv, ERXST, ENC_RX_BUF_START);
 532
 533         /* Preload the RX Data pointer to the beginning of the RX area */
 534         encx24j600_write_reg(priv, ERXRDPT, ENC_RX_BUF_START);
 535
 536         priv->next_packet = ENC_RX_BUF_START;
 537
 538         /* Set up RX end address in the SRAM */
 539         encx24j600_write_reg(priv, ERXTAIL, ENC_SRAM_SIZE - 2);
 540
 541         /* Reset the  user data pointers    */
 542         encx24j600_write_reg(priv, EUDAST, ENC_SRAM_SIZE);
 543         encx24j600_write_reg(priv, EUDAND, ENC_SRAM_SIZE + 1);
 544
 545         /* Set Max Frame length */
 546         encx24j600_write_reg(priv, MAMXFL, MAX_FRAMELEN);
 547 }
 548
 549 static void encx24j600_dump_config(struct encx24j600_priv *priv,
 550                                    const char *msg)
 551 {
 552         pr_info(DRV_NAME ": %s\n", msg);
 553
 554         /* CHIP configuration */
 555         pr_info(DRV_NAME " ECON1:   %04X\n", encx24j600_read_reg(priv, ECON1));
 556         pr_info(DRV_NAME " ECON2:   %04X\n", encx24j600_read_reg(priv, ECON2));
 557         pr_info(DRV_NAME " ERXFCON: %04X\n", encx24j600_read_reg(priv,
 558                                                                  ERXFCON));
 559         pr_info(DRV_NAME " ESTAT:   %04X\n", encx24j600_read_reg(priv, ESTAT));
 560         pr_info(DRV_NAME " EIR:     %04X\n", encx24j600_read_reg(priv, EIR));
 561         pr_info(DRV_NAME " EIDLED:  %04X\n", encx24j600_read_reg(priv, EIDLED));
 562
 563         /* MAC layer configuration */
 564         pr_info(DRV_NAME " MACON1:  %04X\n", encx24j600_read_reg(priv, MACON1));
 565         pr_info(DRV_NAME " MACON2:  %04X\n", encx24j600_read_reg(priv, MACON2));
 566         pr_info(DRV_NAME " MAIPG:   %04X\n", encx24j600_read_reg(priv, MAIPG));
 567         pr_info(DRV_NAME " MACLCON: %04X\n", encx24j600_read_reg(priv,
 568                                                                  MACLCON));
 569         pr_info(DRV_NAME " MABBIPG: %04X\n", encx24j600_read_reg(priv,
 570                                                                  MABBIPG));
 571
 572         /* PHY configuration */
 573         pr_info(DRV_NAME " PHCON1:  %04X\n", encx24j600_read_phy(priv, PHCON1));
 574         pr_info(DRV_NAME " PHCON2:  %04X\n", encx24j600_read_phy(priv, PHCON2));
 575         pr_info(DRV_NAME " PHANA:   %04X\n", encx24j600_read_phy(priv, PHANA));
 576         pr_info(DRV_NAME " PHANLPA: %04X\n", encx24j600_read_phy(priv,
 577                                                                  PHANLPA));
 578         pr_info(DRV_NAME " PHANE:   %04X\n", encx24j600_read_phy(priv, PHANE));
 579         pr_info(DRV_NAME " PHSTAT1: %04X\n", encx24j600_read_phy(priv,
 580                                                                  PHSTAT1));
 581         pr_info(DRV_NAME " PHSTAT2: %04X\n", encx24j600_read_phy(priv,
 582                                                                  PHSTAT2));
 583         pr_info(DRV_NAME " PHSTAT3: %04X\n", encx24j600_read_phy(priv,
 584                                                                  PHSTAT3));
 585 }
 586
 587 static void encx24j600_set_rxfilter_mode(struct encx24j600_priv *priv)
 588 {
 589         switch (priv->rxfilter) {
 590         case RXFILTER_PROMISC:
 591                 encx24j600_set_bits(priv, MACON1, PASSALL);
 592                 encx24j600_write_reg(priv, ERXFCON, UCEN | MCEN | NOTMEEN);
 593                 break;
 594         case RXFILTER_MULTI:
 595                 encx24j600_clr_bits(priv, MACON1, PASSALL);
 596                 encx24j600_write_reg(priv, ERXFCON, UCEN | CRCEN | BCEN | MCEN);
 597                 break;
 598         case RXFILTER_NORMAL:
 599         default:
 600                 encx24j600_clr_bits(priv, MACON1, PASSALL);
 601                 encx24j600_write_reg(priv, ERXFCON, UCEN | CRCEN | BCEN);
 602                 break;
 603         }
 604 }
 605
 606 static void encx24j600_hw_init(struct encx24j600_priv *priv)
 607 {
 608         u16 macon2;
 609
 610         priv->hw_enabled = false;
 611
 612         /* PHY Leds: link status,
 613          * LEDA: Link State + collision events
 614          * LEDB: Link State + transmit/receive events
 615          */
 616         encx24j600_update_reg(priv, EIDLED, 0xff00, 0xcb00);
 617
 618         /* Loopback disabled */
 619         encx24j600_write_reg(priv, MACON1, 0x9);
 620
 621         /* interpacket gap value */
 622         encx24j600_write_reg(priv, MAIPG, 0x0c12);
 623
 624         /* Write the auto negotiation pattern */
 625         encx24j600_write_phy(priv, PHANA, PHANA_DEFAULT);
 626
 627         encx24j600_update_phcon1(priv);
 628         encx24j600_check_link_status(priv);
 629
 630         macon2 = MACON2_RSV1 | TXCRCEN | PADCFG0 | PADCFG2 | MACON2_DEFER;
 631         if ((priv->autoneg == AUTONEG_DISABLE) && priv->full_duplex)
 632                 macon2 |= FULDPX;
 633
 634         encx24j600_set_bits(priv, MACON2, macon2);
 635
 636         priv->rxfilter = RXFILTER_NORMAL;
 637         encx24j600_set_rxfilter_mode(priv);
 638
 639         /* Program the Maximum frame length */
 640         encx24j600_write_reg(priv, MAMXFL, MAX_FRAMELEN);
 641
 642         /* Init Tx pointers */
 643         encx24j600_hw_init_tx(priv);
 644
 645         /* Init Rx pointers */
 646         encx24j600_hw_init_rx(priv);
 647
 648         if (netif_msg_hw(priv))
 649                 encx24j600_dump_config(priv, "Hw is initialized");
 650 }
 651
 652 static void encx24j600_hw_enable(struct encx24j600_priv *priv)
 653 {
 654         /* Clear the interrupt flags in case was set */
 655         encx24j600_clr_bits(priv, EIR, (PCFULIF | RXABTIF | TXABTIF | TXIF |
 656                                         PKTIF | LINKIF));
 657
 658         /* Enable the interrupts */
 659         encx24j600_write_reg(priv, EIE, (PCFULIE | RXABTIE | TXABTIE | TXIE |
 660                                          PKTIE | LINKIE | INTIE));
 661
 662         /* Enable RX */
 663         encx24j600_cmd(priv, ENABLERX);
 664
 665         priv->hw_enabled = true;
 666 }
 667
 668 static void encx24j600_hw_disable(struct encx24j600_priv *priv)
 669 {
 670         /* Disable all interrupts */
 671         encx24j600_write_reg(priv, EIE, 0);
 672
 673         /* Disable RX */
 674         encx24j600_cmd(priv, DISABLERX);
 675
 676         priv->hw_enabled = false;
 677 }
 678
 679 static int encx24j600_setlink(struct net_device *dev, u8 autoneg, u16 speed,
 680                               u8 duplex)
 681 {
 682         struct encx24j600_priv *priv = netdev_priv(dev);
 683         int ret = 0;
 684
 685         if (!priv->hw_enabled) {
 686                 /* link is in low power mode now; duplex setting
 687                  * will take effect on next encx24j600_hw_init()
 688                  */
 689                 if (speed == SPEED_10 || speed == SPEED_100) {
 690                         priv->autoneg = (autoneg == AUTONEG_ENABLE);
 691                         priv->full_duplex = (duplex == DUPLEX_FULL);
 692                         priv->speed = (speed == SPEED_100);
 693                 } else {
 694                         netif_warn(priv, link, dev, "unsupported link speed setting\n");
 695                         /*speeds other than SPEED_10 and SPEED_100 */
 696                         /*are not supported by chip */
 697                         ret = -EOPNOTSUPP;
 698                 }
 699         } else {
 700                 netif_warn(priv, link, dev, "Warning: hw must be disabled to set link mode\n");
 701                 ret = -EBUSY;
 702         }
 703         return ret;
 704 }
 705
 706 static void encx24j600_hw_get_macaddr(struct encx24j600_priv *priv,
 707                                       unsigned char *ethaddr)
 708 {
 709         unsigned short val;
 710
 711         val = encx24j600_read_reg(priv, MAADR1);
 712
 713         ethaddr[0] = val & 0x00ff;
 714         ethaddr[1] = (val & 0xff00) >> 8;
 715
 716         val = encx24j600_read_reg(priv, MAADR2);
 717
 718         ethaddr[2] = val & 0x00ffU;
 719         ethaddr[3] = (val & 0xff00U) >> 8;
 720
 721         val = encx24j600_read_reg(priv, MAADR3);
 722
 723         ethaddr[4] = val & 0x00ffU;
 724         ethaddr[5] = (val & 0xff00U) >> 8;
 725 }
 726
 727 /* Program the hardware MAC address from dev->dev_addr.*/
 728 static int encx24j600_set_hw_macaddr(struct net_device *dev)
 729 {
 730         struct encx24j600_priv *priv = netdev_priv(dev);
 731
 732         if (priv->hw_enabled) {
 733                 netif_info(priv, drv, dev, "Hardware must be disabled to set Mac address\n");
 734                 return -EBUSY;
 735         }
 736
 737         mutex_lock(&priv->lock);
 738
 739         netif_info(priv, drv, dev, "%s: Setting MAC address to %pM\n",
 740                    dev->name, dev->dev_addr);
 741
 742         encx24j600_write_reg(priv, MAADR3, (dev->dev_addr[4] |
 743                              dev->dev_addr[5] << 8));
 744         encx24j600_write_reg(priv, MAADR2, (dev->dev_addr[2] |
 745                              dev->dev_addr[3] << 8));
 746         encx24j600_write_reg(priv, MAADR1, (dev->dev_addr[0] |
 747                              dev->dev_addr[1] << 8));
 748
 749         mutex_unlock(&priv->lock);
 750
 751         return 0;
 752 }
 753
 754 /* Store the new hardware address in dev->dev_addr, and update the MAC.*/
 755 static int encx24j600_set_mac_address(struct net_device *dev, void *addr)
 756 {
 757         struct sockaddr *address = addr;
 758
 759         if (netif_running(dev))
 760                 return -EBUSY;
 761         if (!is_valid_ether_addr(address->sa_data))
 762                 return -EADDRNOTAVAIL;
 763
 764         eth_hw_addr_set(dev, address->sa_data);
 765         return encx24j600_set_hw_macaddr(dev);
 766 }
 767
 768 static int encx24j600_open(struct net_device *dev)
 769 {
 770         struct encx24j600_priv *priv = netdev_priv(dev);
 771
 772         int ret = request_threaded_irq(priv->ctx.spi->irq, NULL, encx24j600_isr,
 773                                        IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
 774                                        DRV_NAME, priv);
 775         if (unlikely(ret < 0)) {
 776                 netdev_err(dev, "request irq %d failed (ret = %d)\n",
 777                            priv->ctx.spi->irq, ret);
 778                 return ret;
 779         }
 780
 781         encx24j600_hw_disable(priv);
 782         encx24j600_hw_init(priv);
 783         encx24j600_hw_enable(priv);
 784         netif_start_queue(dev);
 785
 786         return 0;
 787 }
 788
 789 static int encx24j600_stop(struct net_device *dev)
 790 {
 791         struct encx24j600_priv *priv = netdev_priv(dev);
 792
 793         netif_stop_queue(dev);
 794         free_irq(priv->ctx.spi->irq, priv);
 795         return 0;
 796 }
 797
 798 static void encx24j600_setrx_proc(struct kthread_work *ws)
 799 {
 800         struct encx24j600_priv *priv =
 801                         container_of(ws, struct encx24j600_priv, setrx_work);
 802
 803         mutex_lock(&priv->lock);
 804         encx24j600_set_rxfilter_mode(priv);
 805         mutex_unlock(&priv->lock);
 806 }
 807
 808 static void encx24j600_set_multicast_list(struct net_device *dev)
 809 {
 810         struct encx24j600_priv *priv = netdev_priv(dev);
 811         int oldfilter = priv->rxfilter;
 812
 813         if (dev->flags & IFF_PROMISC) {
 814                 netif_dbg(priv, link, dev, "promiscuous mode\n");
 815                 priv->rxfilter = RXFILTER_PROMISC;
 816         } else if ((dev->flags & IFF_ALLMULTI) || !netdev_mc_empty(dev)) {
 817                 netif_dbg(priv, link, dev, "%smulticast mode\n",
 818                           (dev->flags & IFF_ALLMULTI) ? "all-" : "");
 819                 priv->rxfilter = RXFILTER_MULTI;
 820         } else {
 821                 netif_dbg(priv, link, dev, "normal mode\n");
 822                 priv->rxfilter = RXFILTER_NORMAL;
 823         }
 824
 825         if (oldfilter != priv->rxfilter)
 826                 kthread_queue_work(&priv->kworker, &priv->setrx_work);
 827 }
 828
 829 static void encx24j600_hw_tx(struct encx24j600_priv *priv)
 830 {
 831         struct net_device *dev = priv->ndev;
 832
 833         netif_info(priv, tx_queued, dev, "TX Packet Len:%d\n",
 834                    priv->tx_skb->len);
 835
 836         if (netif_msg_pktdata(priv))
 837                 dump_packet("TX", priv->tx_skb->len, priv->tx_skb->data);
 838
 839         if (encx24j600_read_reg(priv, EIR) & TXABTIF)
 840                 /* Last transmission aborted due to error.
 841                  * Reset TX interface
 842                  */
 843                 encx24j600_reset_hw_tx(priv);
 844
 845         /* Clear the TXIF flag if were previously set */
 846         encx24j600_clr_bits(priv, EIR, TXIF);
 847
 848         /* Set the data pointer to the TX buffer address in the SRAM */
 849         encx24j600_write_reg(priv, EGPWRPT, ENC_TX_BUF_START);
 850
 851         /* Copy the packet into the SRAM */
 852         encx24j600_raw_write(priv, WGPDATA, (u8 *)priv->tx_skb->data,
 853                              priv->tx_skb->len);
 854
 855         /* Program the Tx buffer start pointer */
 856         encx24j600_write_reg(priv, ETXST, ENC_TX_BUF_START);
 857
 858         /* Program the packet length */
 859         encx24j600_write_reg(priv, ETXLEN, priv->tx_skb->len);
 860
 861         /* Start the transmission */
 862         encx24j600_cmd(priv, SETTXRTS);
 863 }
 864
 865 static void encx24j600_tx_proc(struct kthread_work *ws)
 866 {
 867         struct encx24j600_priv *priv =
 868                         container_of(ws, struct encx24j600_priv, tx_work);
 869
 870         mutex_lock(&priv->lock);
 871         encx24j600_hw_tx(priv);
 872         mutex_unlock(&priv->lock);
 873 }
 874
 875 static netdev_tx_t encx24j600_tx(struct sk_buff *skb, struct net_device *dev)
 876 {
 877         struct encx24j600_priv *priv = netdev_priv(dev);
 878
 879         netif_stop_queue(dev);
 880
 881         /* save the timestamp */
 882         netif_trans_update(dev);
 883
 884         /* Remember the skb for deferred processing */
 885         priv->tx_skb = skb;
 886
 887         kthread_queue_work(&priv->kworker, &priv->tx_work);
 888
 889         return NETDEV_TX_OK;
 890 }
 891
 892 /* Deal with a transmit timeout */
 893 static void encx24j600_tx_timeout(struct net_device *dev, unsigned int txqueue)
 894 {
 895         struct encx24j600_priv *priv = netdev_priv(dev);
 896
 897         netif_err(priv, tx_err, dev, "TX timeout at %ld, latency %ld\n",
 898                   jiffies, jiffies - dev_trans_start(dev));
 899
 900         dev->stats.tx_errors++;
 901         netif_wake_queue(dev);
 902 }
 903
 904 static int encx24j600_get_regs_len(struct net_device *dev)
 905 {
 906         return SFR_REG_COUNT;
 907 }
 908
 909 static void encx24j600_get_regs(struct net_device *dev,
 910                                 struct ethtool_regs *regs, void *p)
 911 {
 912         struct encx24j600_priv *priv = netdev_priv(dev);
 913         u16 *buff = p;
 914         u8 reg;
 915
 916         regs->version = 1;
 917         mutex_lock(&priv->lock);
 918         for (reg = 0; reg < SFR_REG_COUNT; reg += 2) {
 919                 unsigned int val = 0;
 920                 /* ignore errors for unreadable registers */
 921                 regmap_read(priv->ctx.regmap, reg, &val);
 922                 buff[reg] = val & 0xffff;
 923         }
 924         mutex_unlock(&priv->lock);
 925 }
 926
 927 static void encx24j600_get_drvinfo(struct net_device *dev,
 928                                    struct ethtool_drvinfo *info)
 929 {
 930         strscpy(info->driver, DRV_NAME, sizeof(info->driver));
 931         strscpy(info->version, DRV_VERSION, sizeof(info->version));
 932         strscpy(info->bus_info, dev_name(dev->dev.parent),
 933                 sizeof(info->bus_info));
 934 }
 935
 936 static int encx24j600_get_link_ksettings(struct net_device *dev,
 937                                          struct ethtool_link_ksettings *cmd)
 938 {
 939         struct encx24j600_priv *priv = netdev_priv(dev);
 940         u32 supported;
 941
 942         supported = SUPPORTED_10baseT_Half | SUPPORTED_10baseT_Full |
 943                          SUPPORTED_100baseT_Half | SUPPORTED_100baseT_Full |
 944                          SUPPORTED_Autoneg | SUPPORTED_TP;
 945
 946         ethtool_convert_legacy_u32_to_link_mode(cmd->link_modes.supported,
 947                                                 supported);
 948
 949         cmd->base.speed = priv->speed;
 950         cmd->base.duplex = priv->full_duplex ? DUPLEX_FULL : DUPLEX_HALF;
 951         cmd->base.port = PORT_TP;
 952         cmd->base.autoneg = priv->autoneg ? AUTONEG_ENABLE : AUTONEG_DISABLE;
 953
 954         return 0;
 955 }
 956
 957 static int
 958 encx24j600_set_link_ksettings(struct net_device *dev,
 959                               const struct ethtool_link_ksettings *cmd)
 960 {
 961         return encx24j600_setlink(dev, cmd->base.autoneg,
 962                                   cmd->base.speed, cmd->base.duplex);
 963 }
 964
 965 static u32 encx24j600_get_msglevel(struct net_device *dev)
 966 {
 967         struct encx24j600_priv *priv = netdev_priv(dev);
 968
 969         return priv->msg_enable;
 970 }
 971
 972 static void encx24j600_set_msglevel(struct net_device *dev, u32 val)
 973 {
 974         struct encx24j600_priv *priv = netdev_priv(dev);
 975
 976         priv->msg_enable = val;
 977 }
 978
 979 static const struct ethtool_ops encx24j600_ethtool_ops = {
 980         .get_drvinfo = encx24j600_get_drvinfo,
 981         .get_msglevel = encx24j600_get_msglevel,
 982         .set_msglevel = encx24j600_set_msglevel,
 983         .get_regs_len = encx24j600_get_regs_len,
 984         .get_regs = encx24j600_get_regs,
 985         .get_link_ksettings = encx24j600_get_link_ksettings,
 986         .set_link_ksettings = encx24j600_set_link_ksettings,
 987 };
 988
 989 static const struct net_device_ops encx24j600_netdev_ops = {
 990         .ndo_open = encx24j600_open,
 991         .ndo_stop = encx24j600_stop,
 992         .ndo_start_xmit = encx24j600_tx,
 993         .ndo_set_rx_mode = encx24j600_set_multicast_list,
 994         .ndo_set_mac_address = encx24j600_set_mac_address,
 995         .ndo_tx_timeout = encx24j600_tx_timeout,
 996         .ndo_validate_addr = eth_validate_addr,
 997 };
 998
 999 static int encx24j600_spi_probe(struct spi_device *spi)
1000 {
1001         int ret;
1002
1003         struct net_device *ndev;
1004         struct encx24j600_priv *priv;
1005         u16 eidled;
1006         u8 addr[ETH_ALEN];
1007
1008         ndev = alloc_etherdev(sizeof(struct encx24j600_priv));
1009
1010         if (!ndev) {
1011                 ret = -ENOMEM;
1012                 goto error_out;
1013         }
1014
1015         priv = netdev_priv(ndev);
1016         spi_set_drvdata(spi, priv);
1017         dev_set_drvdata(&spi->dev, priv);
1018         SET_NETDEV_DEV(ndev, &spi->dev);
1019
1020         priv->msg_enable = netif_msg_init(debug, DEFAULT_MSG_ENABLE);
1021         priv->ndev = ndev;
1022
1023         /* Default configuration PHY configuration */
1024         priv->full_duplex = true;
1025         priv->autoneg = AUTONEG_ENABLE;
1026         priv->speed = SPEED_100;
1027
1028         priv->ctx.spi = spi;
1029         ndev->irq = spi->irq;
1030         ndev->netdev_ops = &encx24j600_netdev_ops;
1031
1032         ret = devm_regmap_init_encx24j600(&spi->dev, &priv->ctx);
1033         if (ret)
1034                 goto out_free;
1035
1036         mutex_init(&priv->lock);
1037
1038         /* Reset device and check if it is connected */
1039         if (encx24j600_hw_reset(priv)) {
1040                 netif_err(priv, probe, ndev,
1041                           DRV_NAME ": Chip is not detected\n");
1042                 ret = -EIO;
1043                 goto out_free;
1044         }
1045
1046         /* Initialize the device HW to the consistent state */
1047         encx24j600_hw_init(priv);
1048
1049         kthread_init_worker(&priv->kworker);
1050         kthread_init_work(&priv->tx_work, encx24j600_tx_proc);
1051         kthread_init_work(&priv->setrx_work, encx24j600_setrx_proc);
1052
1053         priv->kworker_task = kthread_run(kthread_worker_fn, &priv->kworker,
1054                                          "encx24j600");
1055
1056         if (IS_ERR(priv->kworker_task)) {
1057                 ret = PTR_ERR(priv->kworker_task);
1058                 goto out_free;
1059         }
1060
1061         /* Get the MAC address from the chip */
1062         encx24j600_hw_get_macaddr(priv, addr);
1063         eth_hw_addr_set(ndev, addr);
1064
1065         ndev->ethtool_ops = &encx24j600_ethtool_ops;
1066
1067         ret = register_netdev(ndev);
1068         if (unlikely(ret)) {
1069                 netif_err(priv, probe, ndev, "Error %d initializing card encx24j600 card\n",
1070                           ret);
1071                 goto out_stop;
1072         }
1073
1074         eidled = encx24j600_read_reg(priv, EIDLED);
1075         if (((eidled & DEVID_MASK) >> DEVID_SHIFT) != ENCX24J600_DEV_ID) {
1076                 ret = -EINVAL;
1077                 goto out_unregister;
1078         }
1079
1080         netif_info(priv, probe, ndev, "Silicon rev ID: 0x%02x\n",
1081                    (eidled & REVID_MASK) >> REVID_SHIFT);
1082
1083         netif_info(priv, drv, priv->ndev, "MAC address %pM\n", ndev->dev_addr);
1084
1085         return ret;
1086
1087 out_unregister:
1088         unregister_netdev(priv->ndev);
1089 out_stop:
1090         kthread_stop(priv->kworker_task);
1091 out_free:
1092         free_netdev(ndev);
1093
1094 error_out:
1095         return ret;
1096 }
1097
1098 static void encx24j600_spi_remove(struct spi_device *spi)
1099 {
1100         struct encx24j600_priv *priv = dev_get_drvdata(&spi->dev);
1101
1102         unregister_netdev(priv->ndev);
1103         kthread_stop(priv->kworker_task);
1104
1105         free_netdev(priv->ndev);
1106 }
1107
1108 static const struct spi_device_id encx24j600_spi_id_table[] = {
1109         { .name = "encx24j600" },
1110         { /* sentinel */ }
1111 };
1112 MODULE_DEVICE_TABLE(spi, encx24j600_spi_id_table);
1113
1114 static struct spi_driver encx24j600_spi_net_driver = {
1115         .driver = {
1116                 .name   = DRV_NAME,
1117                 .bus    = &spi_bus_type,
1118         },
1119         .probe          = encx24j600_spi_probe,
1120         .remove         = encx24j600_spi_remove,
1121         .id_table       = encx24j600_spi_id_table,
1122 };
1123
1124 module_spi_driver(encx24j600_spi_net_driver);
1125
1126 MODULE_DESCRIPTION(DRV_NAME " ethernet driver");
1127 MODULE_AUTHOR("Jon Ringle <jringle@gridpoint.com>");
1128 MODULE_LICENSE("GPL");