drivers/net/ks8842.c

   1 /*
   2  * ks8842_main.c timberdale KS8842 ethernet driver
   3  * Copyright (c) 2009 Intel Corporation
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  17  */
  18
  19 /* Supports:
  20  * The Micrel KS8842 behind the timberdale FPGA
  21  */
  22
  23 #include <linux/kernel.h>
  24 #include <linux/module.h>
  25 #include <linux/platform_device.h>
  26 #include <linux/netdevice.h>
  27 #include <linux/etherdevice.h>
  28 #include <linux/ethtool.h>
  29
  30 #define DRV_NAME "ks8842"
  31
  32 /* Timberdale specific Registers */
  33 #define REG_TIMB_RST    0x1c
  34
  35 /* KS8842 registers */
  36
  37 #define REG_SELECT_BANK 0x0e
  38
  39 /* bank 0 registers */
  40 #define REG_QRFCR       0x04
  41
  42 /* bank 2 registers */
  43 #define REG_MARL        0x00
  44 #define REG_MARM        0x02
  45 #define REG_MARH        0x04
  46
  47 /* bank 3 registers */
  48 #define REG_GRR         0x06
  49
  50 /* bank 16 registers */
  51 #define REG_TXCR        0x00
  52 #define REG_TXSR        0x02
  53 #define REG_RXCR        0x04
  54 #define REG_TXMIR       0x08
  55 #define REG_RXMIR       0x0A
  56
  57 /* bank 17 registers */
  58 #define REG_TXQCR       0x00
  59 #define REG_RXQCR       0x02
  60 #define REG_TXFDPR      0x04
  61 #define REG_RXFDPR      0x06
  62 #define REG_QMU_DATA_LO 0x08
  63 #define REG_QMU_DATA_HI 0x0A
  64
  65 /* bank 18 registers */
  66 #define REG_IER         0x00
  67 #define IRQ_LINK_CHANGE 0x8000
  68 #define IRQ_TX          0x4000
  69 #define IRQ_RX          0x2000
  70 #define IRQ_RX_OVERRUN  0x0800
  71 #define IRQ_TX_STOPPED  0x0200
  72 #define IRQ_RX_STOPPED  0x0100
  73 #define IRQ_RX_ERROR    0x0080
  74 #define ENABLED_IRQS    (IRQ_LINK_CHANGE | IRQ_TX | IRQ_RX | IRQ_RX_STOPPED | \
  75                 IRQ_TX_STOPPED | IRQ_RX_OVERRUN | IRQ_RX_ERROR)
  76 #define REG_ISR         0x02
  77 #define REG_RXSR        0x04
  78 #define RXSR_VALID      0x8000
  79 #define RXSR_BROADCAST  0x80
  80 #define RXSR_MULTICAST  0x40
  81 #define RXSR_UNICAST    0x20
  82 #define RXSR_FRAMETYPE  0x08
  83 #define RXSR_TOO_LONG   0x04
  84 #define RXSR_RUNT       0x02
  85 #define RXSR_CRC_ERROR  0x01
  86 #define RXSR_ERROR      (RXSR_TOO_LONG | RXSR_RUNT | RXSR_CRC_ERROR)
  87
  88 /* bank 32 registers */
  89 #define REG_SW_ID_AND_ENABLE    0x00
  90 #define REG_SGCR1               0x02
  91 #define REG_SGCR2               0x04
  92 #define REG_SGCR3               0x06
  93
  94 /* bank 39 registers */
  95 #define REG_MACAR1              0x00
  96 #define REG_MACAR2              0x02
  97 #define REG_MACAR3              0x04
  98
  99 /* bank 45 registers */
 100 #define REG_P1MBCR              0x00
 101 #define REG_P1MBSR              0x02
 102
 103 /* bank 46 registers */
 104 #define REG_P2MBCR              0x00
 105 #define REG_P2MBSR              0x02
 106
 107 /* bank 48 registers */
 108 #define REG_P1CR2               0x02
 109
 110 /* bank 49 registers */
 111 #define REG_P1CR4               0x02
 112 #define REG_P1SR                0x04
 113
 114 struct ks8842_adapter {
 115         void __iomem    *hw_addr;
 116         int             irq;
 117         struct tasklet_struct   tasklet;
 118         spinlock_t      lock; /* spinlock to be interrupt safe */
 119         struct platform_device *pdev;
 120 };
 121
 122 static inline void ks8842_select_bank(struct ks8842_adapter *adapter, u16 bank)
 123 {
 124         iowrite16(bank, adapter->hw_addr + REG_SELECT_BANK);
 125 }
 126
 127 static inline void ks8842_write8(struct ks8842_adapter *adapter, u16 bank,
 128         u8 value, int offset)
 129 {
 130         ks8842_select_bank(adapter, bank);
 131         iowrite8(value, adapter->hw_addr + offset);
 132 }
 133
 134 static inline void ks8842_write16(struct ks8842_adapter *adapter, u16 bank,
 135         u16 value, int offset)
 136 {
 137         ks8842_select_bank(adapter, bank);
 138         iowrite16(value, adapter->hw_addr + offset);
 139 }
 140
 141 static inline void ks8842_enable_bits(struct ks8842_adapter *adapter, u16 bank,
 142         u16 bits, int offset)
 143 {
 144         u16 reg;
 145         ks8842_select_bank(adapter, bank);
 146         reg = ioread16(adapter->hw_addr + offset);
 147         reg |= bits;
 148         iowrite16(reg, adapter->hw_addr + offset);
 149 }
 150
 151 static inline void ks8842_clear_bits(struct ks8842_adapter *adapter, u16 bank,
 152         u16 bits, int offset)
 153 {
 154         u16 reg;
 155         ks8842_select_bank(adapter, bank);
 156         reg = ioread16(adapter->hw_addr + offset);
 157         reg &= ~bits;
 158         iowrite16(reg, adapter->hw_addr + offset);
 159 }
 160
 161 static inline void ks8842_write32(struct ks8842_adapter *adapter, u16 bank,
 162         u32 value, int offset)
 163 {
 164         ks8842_select_bank(adapter, bank);
 165         iowrite32(value, adapter->hw_addr + offset);
 166 }
 167
 168 static inline u8 ks8842_read8(struct ks8842_adapter *adapter, u16 bank,
 169         int offset)
 170 {
 171         ks8842_select_bank(adapter, bank);
 172         return ioread8(adapter->hw_addr + offset);
 173 }
 174
 175 static inline u16 ks8842_read16(struct ks8842_adapter *adapter, u16 bank,
 176         int offset)
 177 {
 178         ks8842_select_bank(adapter, bank);
 179         return ioread16(adapter->hw_addr + offset);
 180 }
 181
 182 static inline u32 ks8842_read32(struct ks8842_adapter *adapter, u16 bank,
 183         int offset)
 184 {
 185         ks8842_select_bank(adapter, bank);
 186         return ioread32(adapter->hw_addr + offset);
 187 }
 188
 189 static void ks8842_reset(struct ks8842_adapter *adapter)
 190 {
 191         /* The KS8842 goes haywire when doing softare reset
 192          * a work around in the timberdale IP is implemented to
 193          * do a hardware reset instead
 194         ks8842_write16(adapter, 3, 1, REG_GRR);
 195         msleep(10);
 196         iowrite16(0, adapter->hw_addr + REG_GRR);
 197         */
 198         iowrite16(32, adapter->hw_addr + REG_SELECT_BANK);
 199         iowrite32(0x1, adapter->hw_addr + REG_TIMB_RST);
 200         msleep(20);
 201 }
 202
 203 static void ks8842_update_link_status(struct net_device *netdev,
 204         struct ks8842_adapter *adapter)
 205 {
 206         /* check the status of the link */
 207         if (ks8842_read16(adapter, 45, REG_P1MBSR) & 0x4) {
 208                 netif_carrier_on(netdev);
 209                 netif_wake_queue(netdev);
 210         } else {
 211                 netif_stop_queue(netdev);
 212                 netif_carrier_off(netdev);
 213         }
 214 }
 215
 216 static void ks8842_enable_tx(struct ks8842_adapter *adapter)
 217 {
 218         ks8842_enable_bits(adapter, 16, 0x01, REG_TXCR);
 219 }
 220
 221 static void ks8842_disable_tx(struct ks8842_adapter *adapter)
 222 {
 223         ks8842_clear_bits(adapter, 16, 0x01, REG_TXCR);
 224 }
 225
 226 static void ks8842_enable_rx(struct ks8842_adapter *adapter)
 227 {
 228         ks8842_enable_bits(adapter, 16, 0x01, REG_RXCR);
 229 }
 230
 231 static void ks8842_disable_rx(struct ks8842_adapter *adapter)
 232 {
 233         ks8842_clear_bits(adapter, 16, 0x01, REG_RXCR);
 234 }
 235
 236 static void ks8842_reset_hw(struct ks8842_adapter *adapter)
 237 {
 238         /* reset the HW */
 239         ks8842_reset(adapter);
 240
 241         /* Enable QMU Transmit flow control / transmit padding / Transmit CRC */
 242         ks8842_write16(adapter, 16, 0x000E, REG_TXCR);
 243
 244         /* enable the receiver, uni + multi + broadcast + flow ctrl
 245                 + crc strip */
 246         ks8842_write16(adapter, 16, 0x8 | 0x20 | 0x40 | 0x80 | 0x400,
 247                 REG_RXCR);
 248
 249         /* TX frame pointer autoincrement */
 250         ks8842_write16(adapter, 17, 0x4000, REG_TXFDPR);
 251
 252         /* RX frame pointer autoincrement */
 253         ks8842_write16(adapter, 17, 0x4000, REG_RXFDPR);
 254
 255         /* RX 2 kb high watermark */
 256         ks8842_write16(adapter, 0, 0x1000, REG_QRFCR);
 257
 258         /* aggresive back off in half duplex */
 259         ks8842_enable_bits(adapter, 32, 1 << 8, REG_SGCR1);
 260
 261         /* enable no excessive collison drop */
 262         ks8842_enable_bits(adapter, 32, 1 << 3, REG_SGCR2);
 263
 264         /* Enable port 1 force flow control / back pressure / transmit / recv */
 265         ks8842_write16(adapter, 48, 0x1E07, REG_P1CR2);
 266
 267         /* restart port auto-negotiation */
 268         ks8842_enable_bits(adapter, 49, 1 << 13, REG_P1CR4);
 269         /* only advertise 10Mbps */
 270         ks8842_clear_bits(adapter, 49, 3 << 2, REG_P1CR4);
 271
 272         /* Enable the transmitter */
 273         ks8842_enable_tx(adapter);
 274
 275         /* Enable the receiver */
 276         ks8842_enable_rx(adapter);
 277
 278         /* clear all interrupts */
 279         ks8842_write16(adapter, 18, 0xffff, REG_ISR);
 280
 281         /* enable interrupts */
 282         ks8842_write16(adapter, 18, ENABLED_IRQS, REG_IER);
 283
 284         /* enable the switch */
 285         ks8842_write16(adapter, 32, 0x1, REG_SW_ID_AND_ENABLE);
 286 }
 287
 288 static void ks8842_read_mac_addr(struct ks8842_adapter *adapter, u8 *dest)
 289 {
 290         int i;
 291         u16 mac;
 292
 293         for (i = 0; i < ETH_ALEN; i++)
 294                 dest[ETH_ALEN - i - 1] = ks8842_read8(adapter, 2, REG_MARL + i);
 295
 296         /* make sure the switch port uses the same MAC as the QMU */
 297         mac = ks8842_read16(adapter, 2, REG_MARL);
 298         ks8842_write16(adapter, 39, mac, REG_MACAR1);
 299         mac = ks8842_read16(adapter, 2, REG_MARM);
 300         ks8842_write16(adapter, 39, mac, REG_MACAR2);
 301         mac = ks8842_read16(adapter, 2, REG_MARH);
 302         ks8842_write16(adapter, 39, mac, REG_MACAR3);
 303 }
 304
 305 static inline u16 ks8842_tx_fifo_space(struct ks8842_adapter *adapter)
 306 {
 307         return ks8842_read16(adapter, 16, REG_TXMIR) & 0x1fff;
 308 }
 309
 310 static int ks8842_tx_frame(struct sk_buff *skb, struct net_device *netdev)
 311 {
 312         struct ks8842_adapter *adapter = netdev_priv(netdev);
 313         int len = skb->len;
 314         u32 *ptr = (u32 *)skb->data;
 315         u32 ctrl;
 316
 317         dev_dbg(&adapter->pdev->dev,
 318                 "%s: len %u head %p data %p tail %p end %p\n",
 319                 __func__, skb->len, skb->head, skb->data,
 320                 skb_tail_pointer(skb), skb_end_pointer(skb));
 321
 322         /* check FIFO buffer space, we need space for CRC and command bits */
 323         if (ks8842_tx_fifo_space(adapter) < len + 8)
 324                 return NETDEV_TX_BUSY;
 325
 326         /* the control word, enable IRQ, port 1 and the length */
 327         ctrl = 0x8000 | 0x100 | (len << 16);
 328         ks8842_write32(adapter, 17, ctrl, REG_QMU_DATA_LO);
 329
 330         netdev->stats.tx_bytes += len;
 331
 332         /* copy buffer */
 333         while (len > 0) {
 334                 iowrite32(*ptr, adapter->hw_addr + REG_QMU_DATA_LO);
 335                 len -= sizeof(u32);
 336                 ptr++;
 337         }
 338
 339         /* enqueue packet */
 340         ks8842_write16(adapter, 17, 1, REG_TXQCR);
 341
 342         dev_kfree_skb(skb);
 343
 344         return NETDEV_TX_OK;
 345 }
 346
 347 static void ks8842_rx_frame(struct net_device *netdev,
 348         struct ks8842_adapter *adapter)
 349 {
 350         u32 status = ks8842_read32(adapter, 17, REG_QMU_DATA_LO);
 351         int len = (status >> 16) & 0x7ff;
 352
 353         status &= 0xffff;
 354
 355         dev_dbg(&adapter->pdev->dev, "%s - rx_data: status: %x\n",
 356                 __func__, status);
 357
 358         /* check the status */
 359         if ((status & RXSR_VALID) && !(status & RXSR_ERROR)) {
 360                 struct sk_buff *skb = netdev_alloc_skb_ip_align(netdev, len);
 361
 362                 dev_dbg(&adapter->pdev->dev, "%s, got package, len: %d\n",
 363                         __func__, len);
 364                 if (skb) {
 365                         u32 *data;
 366
 367                         netdev->stats.rx_packets++;
 368                         netdev->stats.rx_bytes += len;
 369                         if (status & RXSR_MULTICAST)
 370                                 netdev->stats.multicast++;
 371
 372                         data = (u32 *)skb_put(skb, len);
 373
 374                         ks8842_select_bank(adapter, 17);
 375                         while (len > 0) {
 376                                 *data++ = ioread32(adapter->hw_addr +
 377                                         REG_QMU_DATA_LO);
 378                                 len -= sizeof(u32);
 379                         }
 380
 381                         skb->protocol = eth_type_trans(skb, netdev);
 382                         netif_rx(skb);
 383                 } else
 384                         netdev->stats.rx_dropped++;
 385         } else {
 386                 dev_dbg(&adapter->pdev->dev, "RX error, status: %x\n", status);
 387                 netdev->stats.rx_errors++;
 388                 if (status & RXSR_TOO_LONG)
 389                         netdev->stats.rx_length_errors++;
 390                 if (status & RXSR_CRC_ERROR)
 391                         netdev->stats.rx_crc_errors++;
 392                 if (status & RXSR_RUNT)
 393                         netdev->stats.rx_frame_errors++;
 394         }
 395
 396         /* set high watermark to 3K */
 397         ks8842_clear_bits(adapter, 0, 1 << 12, REG_QRFCR);
 398
 399         /* release the frame */
 400         ks8842_write16(adapter, 17, 0x01, REG_RXQCR);
 401
 402         /* set high watermark to 2K */
 403         ks8842_enable_bits(adapter, 0, 1 << 12, REG_QRFCR);
 404 }
 405
 406 void ks8842_handle_rx(struct net_device *netdev, struct ks8842_adapter *adapter)
 407 {
 408         u16 rx_data = ks8842_read16(adapter, 16, REG_RXMIR) & 0x1fff;
 409         dev_dbg(&adapter->pdev->dev, "%s Entry - rx_data: %d\n",
 410                 __func__, rx_data);
 411         while (rx_data) {
 412                 ks8842_rx_frame(netdev, adapter);
 413                 rx_data = ks8842_read16(adapter, 16, REG_RXMIR) & 0x1fff;
 414         }
 415 }
 416
 417 void ks8842_handle_tx(struct net_device *netdev, struct ks8842_adapter *adapter)
 418 {
 419         u16 sr = ks8842_read16(adapter, 16, REG_TXSR);
 420         dev_dbg(&adapter->pdev->dev, "%s - entry, sr: %x\n", __func__, sr);
 421         netdev->stats.tx_packets++;
 422         if (netif_queue_stopped(netdev))
 423                 netif_wake_queue(netdev);
 424 }
 425
 426 void ks8842_handle_rx_overrun(struct net_device *netdev,
 427         struct ks8842_adapter *adapter)
 428 {
 429         dev_dbg(&adapter->pdev->dev, "%s: entry\n", __func__);
 430         netdev->stats.rx_errors++;
 431         netdev->stats.rx_fifo_errors++;
 432 }
 433
 434 void ks8842_tasklet(unsigned long arg)
 435 {
 436         struct net_device *netdev = (struct net_device *)arg;
 437         struct ks8842_adapter *adapter = netdev_priv(netdev);
 438         u16 isr;
 439         unsigned long flags;
 440         u16 entry_bank;
 441
 442         /* read current bank to be able to set it back */
 443         spin_lock_irqsave(&adapter->lock, flags);
 444         entry_bank = ioread16(adapter->hw_addr + REG_SELECT_BANK);
 445         spin_unlock_irqrestore(&adapter->lock, flags);
 446
 447         isr = ks8842_read16(adapter, 18, REG_ISR);
 448         dev_dbg(&adapter->pdev->dev, "%s - ISR: 0x%x\n", __func__, isr);
 449
 450         /* Ack */
 451         ks8842_write16(adapter, 18, isr, REG_ISR);
 452
 453         if (!netif_running(netdev))
 454                 return;
 455
 456         if (isr & IRQ_LINK_CHANGE)
 457                 ks8842_update_link_status(netdev, adapter);
 458
 459         if (isr & (IRQ_RX | IRQ_RX_ERROR))
 460                 ks8842_handle_rx(netdev, adapter);
 461
 462         if (isr & IRQ_TX)
 463                 ks8842_handle_tx(netdev, adapter);
 464
 465         if (isr & IRQ_RX_OVERRUN)
 466                 ks8842_handle_rx_overrun(netdev, adapter);
 467
 468         if (isr & IRQ_TX_STOPPED) {
 469                 ks8842_disable_tx(adapter);
 470                 ks8842_enable_tx(adapter);
 471         }
 472
 473         if (isr & IRQ_RX_STOPPED) {
 474                 ks8842_disable_rx(adapter);
 475                 ks8842_enable_rx(adapter);
 476         }
 477
 478         /* re-enable interrupts, put back the bank selection register */
 479         spin_lock_irqsave(&adapter->lock, flags);
 480         ks8842_write16(adapter, 18, ENABLED_IRQS, REG_IER);
 481         iowrite16(entry_bank, adapter->hw_addr + REG_SELECT_BANK);
 482         spin_unlock_irqrestore(&adapter->lock, flags);
 483 }
 484
 485 static irqreturn_t ks8842_irq(int irq, void *devid)
 486 {
 487         struct ks8842_adapter *adapter = devid;
 488         u16 isr;
 489         u16 entry_bank = ioread16(adapter->hw_addr + REG_SELECT_BANK);
 490         irqreturn_t ret = IRQ_NONE;
 491
 492         isr = ks8842_read16(adapter, 18, REG_ISR);
 493         dev_dbg(&adapter->pdev->dev, "%s - ISR: 0x%x\n", __func__, isr);
 494
 495         if (isr) {
 496                 /* disable IRQ */
 497                 ks8842_write16(adapter, 18, 0x00, REG_IER);
 498
 499                 /* schedule tasklet */
 500                 tasklet_schedule(&adapter->tasklet);
 501
 502                 ret = IRQ_HANDLED;
 503         }
 504
 505         iowrite16(entry_bank, adapter->hw_addr + REG_SELECT_BANK);
 506
 507         return ret;
 508 }
 509
 510
 511 /* Netdevice operations */
 512
 513 static int ks8842_open(struct net_device *netdev)
 514 {
 515         struct ks8842_adapter *adapter = netdev_priv(netdev);
 516         int err;
 517
 518         dev_dbg(&adapter->pdev->dev, "%s - entry\n", __func__);
 519
 520         /* reset the HW */
 521         ks8842_reset_hw(adapter);
 522
 523         ks8842_update_link_status(netdev, adapter);
 524
 525         err = request_irq(adapter->irq, ks8842_irq, IRQF_SHARED, DRV_NAME,
 526                 adapter);
 527         if (err) {
 528                 printk(KERN_ERR "Failed to request IRQ: %d: %d\n",
 529                         adapter->irq, err);
 530                 return err;
 531         }
 532
 533         return 0;
 534 }
 535
 536 static int ks8842_close(struct net_device *netdev)
 537 {
 538         struct ks8842_adapter *adapter = netdev_priv(netdev);
 539
 540         dev_dbg(&adapter->pdev->dev, "%s - entry\n", __func__);
 541
 542         /* free the irq */
 543         free_irq(adapter->irq, adapter);
 544
 545         /* disable the switch */
 546         ks8842_write16(adapter, 32, 0x0, REG_SW_ID_AND_ENABLE);
 547
 548         return 0;
 549 }
 550
 551 static netdev_tx_t ks8842_xmit_frame(struct sk_buff *skb,
 552                                      struct net_device *netdev)
 553 {
 554         int ret;
 555         struct ks8842_adapter *adapter = netdev_priv(netdev);
 556
 557         dev_dbg(&adapter->pdev->dev, "%s: entry\n", __func__);
 558
 559         ret = ks8842_tx_frame(skb, netdev);
 560
 561         if (ks8842_tx_fifo_space(adapter) <  netdev->mtu + 8)
 562                 netif_stop_queue(netdev);
 563
 564         return ret;
 565 }
 566
 567 static int ks8842_set_mac(struct net_device *netdev, void *p)
 568 {
 569         struct ks8842_adapter *adapter = netdev_priv(netdev);
 570         unsigned long flags;
 571         struct sockaddr *addr = p;
 572         char *mac = (u8 *)addr->sa_data;
 573         int i;
 574
 575         dev_dbg(&adapter->pdev->dev, "%s: entry\n", __func__);
 576
 577         if (!is_valid_ether_addr(addr->sa_data))
 578                 return -EADDRNOTAVAIL;
 579
 580         memcpy(netdev->dev_addr, mac, netdev->addr_len);
 581
 582         spin_lock_irqsave(&adapter->lock, flags);
 583         for (i = 0; i < ETH_ALEN; i++) {
 584                 ks8842_write8(adapter, 2, mac[ETH_ALEN - i - 1], REG_MARL + i);
 585                 ks8842_write8(adapter, 39, mac[ETH_ALEN - i - 1],
 586                         REG_MACAR1 + i);
 587         }
 588         spin_unlock_irqrestore(&adapter->lock, flags);
 589         return 0;
 590 }
 591
 592 static void ks8842_tx_timeout(struct net_device *netdev)
 593 {
 594         struct ks8842_adapter *adapter = netdev_priv(netdev);
 595         unsigned long flags;
 596
 597         dev_dbg(&adapter->pdev->dev, "%s: entry\n", __func__);
 598
 599         spin_lock_irqsave(&adapter->lock, flags);
 600         /* disable interrupts */
 601         ks8842_write16(adapter, 18, 0, REG_IER);
 602         ks8842_write16(adapter, 18, 0xFFFF, REG_ISR);
 603         spin_unlock_irqrestore(&adapter->lock, flags);
 604
 605         ks8842_reset_hw(adapter);
 606
 607         ks8842_update_link_status(netdev, adapter);
 608 }
 609
 610 static const struct net_device_ops ks8842_netdev_ops = {
 611         .ndo_open               = ks8842_open,
 612         .ndo_stop               = ks8842_close,
 613         .ndo_start_xmit         = ks8842_xmit_frame,
 614         .ndo_set_mac_address    = ks8842_set_mac,
 615         .ndo_tx_timeout         = ks8842_tx_timeout,
 616         .ndo_validate_addr      = eth_validate_addr
 617 };
 618
 619 static const struct ethtool_ops ks8842_ethtool_ops = {
 620         .get_link               = ethtool_op_get_link,
 621 };
 622
 623 static int __devinit ks8842_probe(struct platform_device *pdev)
 624 {
 625         int err = -ENOMEM;
 626         struct resource *iomem;
 627         struct net_device *netdev;
 628         struct ks8842_adapter *adapter;
 629         u16 id;
 630
 631         iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 632         if (!request_mem_region(iomem->start, resource_size(iomem), DRV_NAME))
 633                 goto err_mem_region;
 634
 635         netdev = alloc_etherdev(sizeof(struct ks8842_adapter));
 636         if (!netdev)
 637                 goto err_alloc_etherdev;
 638
 639         SET_NETDEV_DEV(netdev, &pdev->dev);
 640
 641         adapter = netdev_priv(netdev);
 642         adapter->hw_addr = ioremap(iomem->start, resource_size(iomem));
 643         if (!adapter->hw_addr)
 644                 goto err_ioremap;
 645
 646         adapter->irq = platform_get_irq(pdev, 0);
 647         if (adapter->irq < 0) {
 648                 err = adapter->irq;
 649                 goto err_get_irq;
 650         }
 651
 652         adapter->pdev = pdev;
 653
 654         tasklet_init(&adapter->tasklet, ks8842_tasklet, (unsigned long)netdev);
 655         spin_lock_init(&adapter->lock);
 656
 657         netdev->netdev_ops = &ks8842_netdev_ops;
 658         netdev->ethtool_ops = &ks8842_ethtool_ops;
 659
 660         ks8842_read_mac_addr(adapter, netdev->dev_addr);
 661
 662         id = ks8842_read16(adapter, 32, REG_SW_ID_AND_ENABLE);
 663
 664         strcpy(netdev->name, "eth%d");
 665         err = register_netdev(netdev);
 666         if (err)
 667                 goto err_register;
 668
 669         platform_set_drvdata(pdev, netdev);
 670
 671         printk(KERN_INFO DRV_NAME
 672                 " Found chip, family: 0x%x, id: 0x%x, rev: 0x%x\n",
 673                 (id >> 8) & 0xff, (id >> 4) & 0xf, (id >> 1) & 0x7);
 674
 675         return 0;
 676
 677 err_register:
 678 err_get_irq:
 679         iounmap(adapter->hw_addr);
 680 err_ioremap:
 681         free_netdev(netdev);
 682 err_alloc_etherdev:
 683         release_mem_region(iomem->start, resource_size(iomem));
 684 err_mem_region:
 685         return err;
 686 }
 687
 688 static int __devexit ks8842_remove(struct platform_device *pdev)
 689 {
 690         struct net_device *netdev = platform_get_drvdata(pdev);
 691         struct ks8842_adapter *adapter = netdev_priv(netdev);
 692         struct resource *iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 693
 694         unregister_netdev(netdev);
 695         tasklet_kill(&adapter->tasklet);
 696         iounmap(adapter->hw_addr);
 697         free_netdev(netdev);
 698         release_mem_region(iomem->start, resource_size(iomem));
 699         platform_set_drvdata(pdev, NULL);
 700         return 0;
 701 }
 702
 703
 704 static struct platform_driver ks8842_platform_driver = {
 705         .driver = {
 706                 .name   = DRV_NAME,
 707                 .owner  = THIS_MODULE,
 708         },
 709         .probe          = ks8842_probe,
 710         .remove         = ks8842_remove,
 711 };
 712
 713 static int __init ks8842_init(void)
 714 {
 715         return platform_driver_register(&ks8842_platform_driver);
 716 }
 717
 718 static void __exit ks8842_exit(void)
 719 {
 720         platform_driver_unregister(&ks8842_platform_driver);
 721 }
 722
 723 module_init(ks8842_init);
 724 module_exit(ks8842_exit);
 725
 726 MODULE_DESCRIPTION("Timberdale KS8842 ethernet driver");
 727 MODULE_AUTHOR("Mocean Laboratories <info@mocean-labs.com>");
 728 MODULE_LICENSE("GPL v2");
 729 MODULE_ALIAS("platform:ks8842");
 730