drivers/net/ks8842.c

   1 /*
   2  * ks8842.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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  24
  25 #include <linux/kernel.h>
  26 #include <linux/module.h>
  27 #include <linux/platform_device.h>
  28 #include <linux/netdevice.h>
  29 #include <linux/etherdevice.h>
  30 #include <linux/ethtool.h>
  31 #include <linux/ks8842.h>
  32
  33 #define DRV_NAME "ks8842"
  34
  35 /* Timberdale specific Registers */
  36 #define REG_TIMB_RST    0x1c
  37
  38 /* KS8842 registers */
  39
  40 #define REG_SELECT_BANK 0x0e
  41
  42 /* bank 0 registers */
  43 #define REG_QRFCR       0x04
  44
  45 /* bank 2 registers */
  46 #define REG_MARL        0x00
  47 #define REG_MARM        0x02
  48 #define REG_MARH        0x04
  49
  50 /* bank 3 registers */
  51 #define REG_GRR         0x06
  52
  53 /* bank 16 registers */
  54 #define REG_TXCR        0x00
  55 #define REG_TXSR        0x02
  56 #define REG_RXCR        0x04
  57 #define REG_TXMIR       0x08
  58 #define REG_RXMIR       0x0A
  59
  60 /* bank 17 registers */
  61 #define REG_TXQCR       0x00
  62 #define REG_RXQCR       0x02
  63 #define REG_TXFDPR      0x04
  64 #define REG_RXFDPR      0x06
  65 #define REG_QMU_DATA_LO 0x08
  66 #define REG_QMU_DATA_HI 0x0A
  67
  68 /* bank 18 registers */
  69 #define REG_IER         0x00
  70 #define IRQ_LINK_CHANGE 0x8000
  71 #define IRQ_TX          0x4000
  72 #define IRQ_RX          0x2000
  73 #define IRQ_RX_OVERRUN  0x0800
  74 #define IRQ_TX_STOPPED  0x0200
  75 #define IRQ_RX_STOPPED  0x0100
  76 #define IRQ_RX_ERROR    0x0080
  77 #define ENABLED_IRQS    (IRQ_LINK_CHANGE | IRQ_TX | IRQ_RX | IRQ_RX_STOPPED | \
  78                 IRQ_TX_STOPPED | IRQ_RX_OVERRUN | IRQ_RX_ERROR)
  79 #define REG_ISR         0x02
  80 #define REG_RXSR        0x04
  81 #define RXSR_VALID      0x8000
  82 #define RXSR_BROADCAST  0x80
  83 #define RXSR_MULTICAST  0x40
  84 #define RXSR_UNICAST    0x20
  85 #define RXSR_FRAMETYPE  0x08
  86 #define RXSR_TOO_LONG   0x04
  87 #define RXSR_RUNT       0x02
  88 #define RXSR_CRC_ERROR  0x01
  89 #define RXSR_ERROR      (RXSR_TOO_LONG | RXSR_RUNT | RXSR_CRC_ERROR)
  90
  91 /* bank 32 registers */
  92 #define REG_SW_ID_AND_ENABLE    0x00
  93 #define REG_SGCR1               0x02
  94 #define REG_SGCR2               0x04
  95 #define REG_SGCR3               0x06
  96
  97 /* bank 39 registers */
  98 #define REG_MACAR1              0x00
  99 #define REG_MACAR2              0x02
 100 #define REG_MACAR3              0x04
 101
 102 /* bank 45 registers */
 103 #define REG_P1MBCR              0x00
 104 #define REG_P1MBSR              0x02
 105
 106 /* bank 46 registers */
 107 #define REG_P2MBCR              0x00
 108 #define REG_P2MBSR              0x02
 109
 110 /* bank 48 registers */
 111 #define REG_P1CR2               0x02
 112
 113 /* bank 49 registers */
 114 #define REG_P1CR4               0x02
 115 #define REG_P1SR                0x04
 116
 117 struct ks8842_adapter {
 118         void __iomem    *hw_addr;
 119         int             irq;
 120         struct tasklet_struct   tasklet;
 121         spinlock_t      lock; /* spinlock to be interrupt safe */
 122         struct platform_device *pdev;
 123 };
 124
 125 static inline void ks8842_select_bank(struct ks8842_adapter *adapter, u16 bank)
 126 {
 127         iowrite16(bank, adapter->hw_addr + REG_SELECT_BANK);
 128 }
 129
 130 static inline void ks8842_write8(struct ks8842_adapter *adapter, u16 bank,
 131         u8 value, int offset)
 132 {
 133         ks8842_select_bank(adapter, bank);
 134         iowrite8(value, adapter->hw_addr + offset);
 135 }
 136
 137 static inline void ks8842_write16(struct ks8842_adapter *adapter, u16 bank,
 138         u16 value, int offset)
 139 {
 140         ks8842_select_bank(adapter, bank);
 141         iowrite16(value, adapter->hw_addr + offset);
 142 }
 143
 144 static inline void ks8842_enable_bits(struct ks8842_adapter *adapter, u16 bank,
 145         u16 bits, int offset)
 146 {
 147         u16 reg;
 148         ks8842_select_bank(adapter, bank);
 149         reg = ioread16(adapter->hw_addr + offset);
 150         reg |= bits;
 151         iowrite16(reg, adapter->hw_addr + offset);
 152 }
 153
 154 static inline void ks8842_clear_bits(struct ks8842_adapter *adapter, u16 bank,
 155         u16 bits, int offset)
 156 {
 157         u16 reg;
 158         ks8842_select_bank(adapter, bank);
 159         reg = ioread16(adapter->hw_addr + offset);
 160         reg &= ~bits;
 161         iowrite16(reg, adapter->hw_addr + offset);
 162 }
 163
 164 static inline void ks8842_write32(struct ks8842_adapter *adapter, u16 bank,
 165         u32 value, int offset)
 166 {
 167         ks8842_select_bank(adapter, bank);
 168         iowrite32(value, adapter->hw_addr + offset);
 169 }
 170
 171 static inline u8 ks8842_read8(struct ks8842_adapter *adapter, u16 bank,
 172         int offset)
 173 {
 174         ks8842_select_bank(adapter, bank);
 175         return ioread8(adapter->hw_addr + offset);
 176 }
 177
 178 static inline u16 ks8842_read16(struct ks8842_adapter *adapter, u16 bank,
 179         int offset)
 180 {
 181         ks8842_select_bank(adapter, bank);
 182         return ioread16(adapter->hw_addr + offset);
 183 }
 184
 185 static inline u32 ks8842_read32(struct ks8842_adapter *adapter, u16 bank,
 186         int offset)
 187 {
 188         ks8842_select_bank(adapter, bank);
 189         return ioread32(adapter->hw_addr + offset);
 190 }
 191
 192 static void ks8842_reset(struct ks8842_adapter *adapter)
 193 {
 194         /* The KS8842 goes haywire when doing softare reset
 195          * a work around in the timberdale IP is implemented to
 196          * do a hardware reset instead
 197         ks8842_write16(adapter, 3, 1, REG_GRR);
 198         msleep(10);
 199         iowrite16(0, adapter->hw_addr + REG_GRR);
 200         */
 201         iowrite16(32, adapter->hw_addr + REG_SELECT_BANK);
 202         iowrite32(0x1, adapter->hw_addr + REG_TIMB_RST);
 203         msleep(20);
 204 }
 205
 206 static void ks8842_update_link_status(struct net_device *netdev,
 207         struct ks8842_adapter *adapter)
 208 {
 209         /* check the status of the link */
 210         if (ks8842_read16(adapter, 45, REG_P1MBSR) & 0x4) {
 211                 netif_carrier_on(netdev);
 212                 netif_wake_queue(netdev);
 213         } else {
 214                 netif_stop_queue(netdev);
 215                 netif_carrier_off(netdev);
 216         }
 217 }
 218
 219 static void ks8842_enable_tx(struct ks8842_adapter *adapter)
 220 {
 221         ks8842_enable_bits(adapter, 16, 0x01, REG_TXCR);
 222 }
 223
 224 static void ks8842_disable_tx(struct ks8842_adapter *adapter)
 225 {
 226         ks8842_clear_bits(adapter, 16, 0x01, REG_TXCR);
 227 }
 228
 229 static void ks8842_enable_rx(struct ks8842_adapter *adapter)
 230 {
 231         ks8842_enable_bits(adapter, 16, 0x01, REG_RXCR);
 232 }
 233
 234 static void ks8842_disable_rx(struct ks8842_adapter *adapter)
 235 {
 236         ks8842_clear_bits(adapter, 16, 0x01, REG_RXCR);
 237 }
 238
 239 static void ks8842_reset_hw(struct ks8842_adapter *adapter)
 240 {
 241         /* reset the HW */
 242         ks8842_reset(adapter);
 243
 244         /* Enable QMU Transmit flow control / transmit padding / Transmit CRC */
 245         ks8842_write16(adapter, 16, 0x000E, REG_TXCR);
 246
 247         /* enable the receiver, uni + multi + broadcast + flow ctrl
 248                 + crc strip */
 249         ks8842_write16(adapter, 16, 0x8 | 0x20 | 0x40 | 0x80 | 0x400,
 250                 REG_RXCR);
 251
 252         /* TX frame pointer autoincrement */
 253         ks8842_write16(adapter, 17, 0x4000, REG_TXFDPR);
 254
 255         /* RX frame pointer autoincrement */
 256         ks8842_write16(adapter, 17, 0x4000, REG_RXFDPR);
 257
 258         /* RX 2 kb high watermark */
 259         ks8842_write16(adapter, 0, 0x1000, REG_QRFCR);
 260
 261         /* aggresive back off in half duplex */
 262         ks8842_enable_bits(adapter, 32, 1 << 8, REG_SGCR1);
 263
 264         /* enable no excessive collison drop */
 265         ks8842_enable_bits(adapter, 32, 1 << 3, REG_SGCR2);
 266
 267         /* Enable port 1 force flow control / back pressure / transmit / recv */
 268         ks8842_write16(adapter, 48, 0x1E07, REG_P1CR2);
 269
 270         /* restart port auto-negotiation */
 271         ks8842_enable_bits(adapter, 49, 1 << 13, REG_P1CR4);
 272         /* only advertise 10Mbps */
 273         ks8842_clear_bits(adapter, 49, 3 << 2, REG_P1CR4);
 274
 275         /* Enable the transmitter */
 276         ks8842_enable_tx(adapter);
 277
 278         /* Enable the receiver */
 279         ks8842_enable_rx(adapter);
 280
 281         /* clear all interrupts */
 282         ks8842_write16(adapter, 18, 0xffff, REG_ISR);
 283
 284         /* enable interrupts */
 285         ks8842_write16(adapter, 18, ENABLED_IRQS, REG_IER);
 286
 287         /* enable the switch */
 288         ks8842_write16(adapter, 32, 0x1, REG_SW_ID_AND_ENABLE);
 289 }
 290
 291 static void ks8842_read_mac_addr(struct ks8842_adapter *adapter, u8 *dest)
 292 {
 293         int i;
 294         u16 mac;
 295
 296         for (i = 0; i < ETH_ALEN; i++)
 297                 dest[ETH_ALEN - i - 1] = ks8842_read8(adapter, 2, REG_MARL + i);
 298
 299         /* make sure the switch port uses the same MAC as the QMU */
 300         mac = ks8842_read16(adapter, 2, REG_MARL);
 301         ks8842_write16(adapter, 39, mac, REG_MACAR1);
 302         mac = ks8842_read16(adapter, 2, REG_MARM);
 303         ks8842_write16(adapter, 39, mac, REG_MACAR2);
 304         mac = ks8842_read16(adapter, 2, REG_MARH);
 305         ks8842_write16(adapter, 39, mac, REG_MACAR3);
 306 }
 307
 308 static void ks8842_write_mac_addr(struct ks8842_adapter *adapter, u8 *mac)
 309 {
 310         unsigned long flags;
 311         unsigned i;
 312
 313         spin_lock_irqsave(&adapter->lock, flags);
 314         for (i = 0; i < ETH_ALEN; i++) {
 315                 ks8842_write8(adapter, 2, mac[ETH_ALEN - i - 1], REG_MARL + i);
 316                 ks8842_write8(adapter, 39, mac[ETH_ALEN - i - 1],
 317                         REG_MACAR1 + i);
 318         }
 319         spin_unlock_irqrestore(&adapter->lock, flags);
 320 }
 321
 322 static inline u16 ks8842_tx_fifo_space(struct ks8842_adapter *adapter)
 323 {
 324         return ks8842_read16(adapter, 16, REG_TXMIR) & 0x1fff;
 325 }
 326
 327 static int ks8842_tx_frame(struct sk_buff *skb, struct net_device *netdev)
 328 {
 329         struct ks8842_adapter *adapter = netdev_priv(netdev);
 330         int len = skb->len;
 331         u32 *ptr = (u32 *)skb->data;
 332         u32 ctrl;
 333
 334         dev_dbg(&adapter->pdev->dev,
 335                 "%s: len %u head %p data %p tail %p end %p\n",
 336                 __func__, skb->len, skb->head, skb->data,
 337                 skb_tail_pointer(skb), skb_end_pointer(skb));
 338
 339         /* check FIFO buffer space, we need space for CRC and command bits */
 340         if (ks8842_tx_fifo_space(adapter) < len + 8)
 341                 return NETDEV_TX_BUSY;
 342
 343         /* the control word, enable IRQ, port 1 and the length */
 344         ctrl = 0x8000 | 0x100 | (len << 16);
 345         ks8842_write32(adapter, 17, ctrl, REG_QMU_DATA_LO);
 346
 347         netdev->stats.tx_bytes += len;
 348
 349         /* copy buffer */
 350         while (len > 0) {
 351                 iowrite32(*ptr, adapter->hw_addr + REG_QMU_DATA_LO);
 352                 len -= sizeof(u32);
 353                 ptr++;
 354         }
 355
 356         /* enqueue packet */
 357         ks8842_write16(adapter, 17, 1, REG_TXQCR);
 358
 359         dev_kfree_skb(skb);
 360
 361         return NETDEV_TX_OK;
 362 }
 363
 364 static void ks8842_rx_frame(struct net_device *netdev,
 365         struct ks8842_adapter *adapter)
 366 {
 367         u32 status = ks8842_read32(adapter, 17, REG_QMU_DATA_LO);
 368         int len = (status >> 16) & 0x7ff;
 369
 370         status &= 0xffff;
 371
 372         dev_dbg(&adapter->pdev->dev, "%s - rx_data: status: %x\n",
 373                 __func__, status);
 374
 375         /* check the status */
 376         if ((status & RXSR_VALID) && !(status & RXSR_ERROR)) {
 377                 struct sk_buff *skb = netdev_alloc_skb_ip_align(netdev, len);
 378
 379                 dev_dbg(&adapter->pdev->dev, "%s, got package, len: %d\n",
 380                         __func__, len);
 381                 if (skb) {
 382                         u32 *data;
 383
 384                         netdev->stats.rx_packets++;
 385                         netdev->stats.rx_bytes += len;
 386                         if (status & RXSR_MULTICAST)
 387                                 netdev->stats.multicast++;
 388
 389                         data = (u32 *)skb_put(skb, len);
 390
 391                         ks8842_select_bank(adapter, 17);
 392                         while (len > 0) {
 393                                 *data++ = ioread32(adapter->hw_addr +
 394                                         REG_QMU_DATA_LO);
 395                                 len -= sizeof(u32);
 396                         }
 397
 398                         skb->protocol = eth_type_trans(skb, netdev);
 399                         netif_rx(skb);
 400                 } else
 401                         netdev->stats.rx_dropped++;
 402         } else {
 403                 dev_dbg(&adapter->pdev->dev, "RX error, status: %x\n", status);
 404                 netdev->stats.rx_errors++;
 405                 if (status & RXSR_TOO_LONG)
 406                         netdev->stats.rx_length_errors++;
 407                 if (status & RXSR_CRC_ERROR)
 408                         netdev->stats.rx_crc_errors++;
 409                 if (status & RXSR_RUNT)
 410                         netdev->stats.rx_frame_errors++;
 411         }
 412
 413         /* set high watermark to 3K */
 414         ks8842_clear_bits(adapter, 0, 1 << 12, REG_QRFCR);
 415
 416         /* release the frame */
 417         ks8842_write16(adapter, 17, 0x01, REG_RXQCR);
 418
 419         /* set high watermark to 2K */
 420         ks8842_enable_bits(adapter, 0, 1 << 12, REG_QRFCR);
 421 }
 422
 423 void ks8842_handle_rx(struct net_device *netdev, struct ks8842_adapter *adapter)
 424 {
 425         u16 rx_data = ks8842_read16(adapter, 16, REG_RXMIR) & 0x1fff;
 426         dev_dbg(&adapter->pdev->dev, "%s Entry - rx_data: %d\n",
 427                 __func__, rx_data);
 428         while (rx_data) {
 429                 ks8842_rx_frame(netdev, adapter);
 430                 rx_data = ks8842_read16(adapter, 16, REG_RXMIR) & 0x1fff;
 431         }
 432 }
 433
 434 void ks8842_handle_tx(struct net_device *netdev, struct ks8842_adapter *adapter)
 435 {
 436         u16 sr = ks8842_read16(adapter, 16, REG_TXSR);
 437         dev_dbg(&adapter->pdev->dev, "%s - entry, sr: %x\n", __func__, sr);
 438         netdev->stats.tx_packets++;
 439         if (netif_queue_stopped(netdev))
 440                 netif_wake_queue(netdev);
 441 }
 442
 443 void ks8842_handle_rx_overrun(struct net_device *netdev,
 444         struct ks8842_adapter *adapter)
 445 {
 446         dev_dbg(&adapter->pdev->dev, "%s: entry\n", __func__);
 447         netdev->stats.rx_errors++;
 448         netdev->stats.rx_fifo_errors++;
 449 }
 450
 451 void ks8842_tasklet(unsigned long arg)
 452 {
 453         struct net_device *netdev = (struct net_device *)arg;
 454         struct ks8842_adapter *adapter = netdev_priv(netdev);
 455         u16 isr;
 456         unsigned long flags;
 457         u16 entry_bank;
 458
 459         /* read current bank to be able to set it back */
 460         spin_lock_irqsave(&adapter->lock, flags);
 461         entry_bank = ioread16(adapter->hw_addr + REG_SELECT_BANK);
 462         spin_unlock_irqrestore(&adapter->lock, flags);
 463
 464         isr = ks8842_read16(adapter, 18, REG_ISR);
 465         dev_dbg(&adapter->pdev->dev, "%s - ISR: 0x%x\n", __func__, isr);
 466
 467         /* Ack */
 468         ks8842_write16(adapter, 18, isr, REG_ISR);
 469
 470         if (!netif_running(netdev))
 471                 return;
 472
 473         if (isr & IRQ_LINK_CHANGE)
 474                 ks8842_update_link_status(netdev, adapter);
 475
 476         if (isr & (IRQ_RX | IRQ_RX_ERROR))
 477                 ks8842_handle_rx(netdev, adapter);
 478
 479         if (isr & IRQ_TX)
 480                 ks8842_handle_tx(netdev, adapter);
 481
 482         if (isr & IRQ_RX_OVERRUN)
 483                 ks8842_handle_rx_overrun(netdev, adapter);
 484
 485         if (isr & IRQ_TX_STOPPED) {
 486                 ks8842_disable_tx(adapter);
 487                 ks8842_enable_tx(adapter);
 488         }
 489
 490         if (isr & IRQ_RX_STOPPED) {
 491                 ks8842_disable_rx(adapter);
 492                 ks8842_enable_rx(adapter);
 493         }
 494
 495         /* re-enable interrupts, put back the bank selection register */
 496         spin_lock_irqsave(&adapter->lock, flags);
 497         ks8842_write16(adapter, 18, ENABLED_IRQS, REG_IER);
 498         iowrite16(entry_bank, adapter->hw_addr + REG_SELECT_BANK);
 499         spin_unlock_irqrestore(&adapter->lock, flags);
 500 }
 501
 502 static irqreturn_t ks8842_irq(int irq, void *devid)
 503 {
 504         struct ks8842_adapter *adapter = devid;
 505         u16 isr;
 506         u16 entry_bank = ioread16(adapter->hw_addr + REG_SELECT_BANK);
 507         irqreturn_t ret = IRQ_NONE;
 508
 509         isr = ks8842_read16(adapter, 18, REG_ISR);
 510         dev_dbg(&adapter->pdev->dev, "%s - ISR: 0x%x\n", __func__, isr);
 511
 512         if (isr) {
 513                 /* disable IRQ */
 514                 ks8842_write16(adapter, 18, 0x00, REG_IER);
 515
 516                 /* schedule tasklet */
 517                 tasklet_schedule(&adapter->tasklet);
 518
 519                 ret = IRQ_HANDLED;
 520         }
 521
 522         iowrite16(entry_bank, adapter->hw_addr + REG_SELECT_BANK);
 523
 524         return ret;
 525 }
 526
 527
 528 /* Netdevice operations */
 529
 530 static int ks8842_open(struct net_device *netdev)
 531 {
 532         struct ks8842_adapter *adapter = netdev_priv(netdev);
 533         int err;
 534
 535         dev_dbg(&adapter->pdev->dev, "%s - entry\n", __func__);
 536
 537         /* reset the HW */
 538         ks8842_reset_hw(adapter);
 539
 540         ks8842_write_mac_addr(adapter, netdev->dev_addr);
 541
 542         ks8842_update_link_status(netdev, adapter);
 543
 544         err = request_irq(adapter->irq, ks8842_irq, IRQF_SHARED, DRV_NAME,
 545                 adapter);
 546         if (err) {
 547                 pr_err("Failed to request IRQ: %d: %d\n", adapter->irq, err);
 548                 return err;
 549         }
 550
 551         return 0;
 552 }
 553
 554 static int ks8842_close(struct net_device *netdev)
 555 {
 556         struct ks8842_adapter *adapter = netdev_priv(netdev);
 557
 558         dev_dbg(&adapter->pdev->dev, "%s - entry\n", __func__);
 559
 560         /* free the irq */
 561         free_irq(adapter->irq, adapter);
 562
 563         /* disable the switch */
 564         ks8842_write16(adapter, 32, 0x0, REG_SW_ID_AND_ENABLE);
 565
 566         return 0;
 567 }
 568
 569 static netdev_tx_t ks8842_xmit_frame(struct sk_buff *skb,
 570                                      struct net_device *netdev)
 571 {
 572         int ret;
 573         struct ks8842_adapter *adapter = netdev_priv(netdev);
 574
 575         dev_dbg(&adapter->pdev->dev, "%s: entry\n", __func__);
 576
 577         ret = ks8842_tx_frame(skb, netdev);
 578
 579         if (ks8842_tx_fifo_space(adapter) <  netdev->mtu + 8)
 580                 netif_stop_queue(netdev);
 581
 582         return ret;
 583 }
 584
 585 static int ks8842_set_mac(struct net_device *netdev, void *p)
 586 {
 587         struct ks8842_adapter *adapter = netdev_priv(netdev);
 588         struct sockaddr *addr = p;
 589         char *mac = (u8 *)addr->sa_data;
 590
 591         dev_dbg(&adapter->pdev->dev, "%s: entry\n", __func__);
 592
 593         if (!is_valid_ether_addr(addr->sa_data))
 594                 return -EADDRNOTAVAIL;
 595
 596         memcpy(netdev->dev_addr, mac, netdev->addr_len);
 597
 598         ks8842_write_mac_addr(adapter, mac);
 599         return 0;
 600 }
 601
 602 static void ks8842_tx_timeout(struct net_device *netdev)
 603 {
 604         struct ks8842_adapter *adapter = netdev_priv(netdev);
 605         unsigned long flags;
 606
 607         dev_dbg(&adapter->pdev->dev, "%s: entry\n", __func__);
 608
 609         spin_lock_irqsave(&adapter->lock, flags);
 610         /* disable interrupts */
 611         ks8842_write16(adapter, 18, 0, REG_IER);
 612         ks8842_write16(adapter, 18, 0xFFFF, REG_ISR);
 613         spin_unlock_irqrestore(&adapter->lock, flags);
 614
 615         ks8842_reset_hw(adapter);
 616
 617         ks8842_write_mac_addr(adapter, netdev->dev_addr);
 618
 619         ks8842_update_link_status(netdev, adapter);
 620 }
 621
 622 static const struct net_device_ops ks8842_netdev_ops = {
 623         .ndo_open               = ks8842_open,
 624         .ndo_stop               = ks8842_close,
 625         .ndo_start_xmit         = ks8842_xmit_frame,
 626         .ndo_set_mac_address    = ks8842_set_mac,
 627         .ndo_tx_timeout         = ks8842_tx_timeout,
 628         .ndo_validate_addr      = eth_validate_addr
 629 };
 630
 631 static const struct ethtool_ops ks8842_ethtool_ops = {
 632         .get_link               = ethtool_op_get_link,
 633 };
 634
 635 static int __devinit ks8842_probe(struct platform_device *pdev)
 636 {
 637         int err = -ENOMEM;
 638         struct resource *iomem;
 639         struct net_device *netdev;
 640         struct ks8842_adapter *adapter;
 641         struct ks8842_platform_data *pdata = pdev->dev.platform_data;
 642         u16 id;
 643         unsigned i;
 644
 645         iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 646         if (!request_mem_region(iomem->start, resource_size(iomem), DRV_NAME))
 647                 goto err_mem_region;
 648
 649         netdev = alloc_etherdev(sizeof(struct ks8842_adapter));
 650         if (!netdev)
 651                 goto err_alloc_etherdev;
 652
 653         SET_NETDEV_DEV(netdev, &pdev->dev);
 654
 655         adapter = netdev_priv(netdev);
 656         adapter->hw_addr = ioremap(iomem->start, resource_size(iomem));
 657         if (!adapter->hw_addr)
 658                 goto err_ioremap;
 659
 660         adapter->irq = platform_get_irq(pdev, 0);
 661         if (adapter->irq < 0) {
 662                 err = adapter->irq;
 663                 goto err_get_irq;
 664         }
 665
 666         adapter->pdev = pdev;
 667
 668         tasklet_init(&adapter->tasklet, ks8842_tasklet, (unsigned long)netdev);
 669         spin_lock_init(&adapter->lock);
 670
 671         netdev->netdev_ops = &ks8842_netdev_ops;
 672         netdev->ethtool_ops = &ks8842_ethtool_ops;
 673
 674         /* Check if a mac address was given */
 675         i = netdev->addr_len;
 676         if (pdata) {
 677                 for (i = 0; i < netdev->addr_len; i++)
 678                         if (pdata->macaddr[i] != 0)
 679                                 break;
 680
 681                 if (i < netdev->addr_len)
 682                         /* an address was passed, use it */
 683                         memcpy(netdev->dev_addr, pdata->macaddr,
 684                                 netdev->addr_len);
 685         }
 686
 687         if (i == netdev->addr_len) {
 688                 ks8842_read_mac_addr(adapter, netdev->dev_addr);
 689
 690                 if (!is_valid_ether_addr(netdev->dev_addr))
 691                         random_ether_addr(netdev->dev_addr);
 692         }
 693
 694         id = ks8842_read16(adapter, 32, REG_SW_ID_AND_ENABLE);
 695
 696         strcpy(netdev->name, "eth%d");
 697         err = register_netdev(netdev);
 698         if (err)
 699                 goto err_register;
 700
 701         platform_set_drvdata(pdev, netdev);
 702
 703         pr_info("Found chip, family: 0x%x, id: 0x%x, rev: 0x%x\n",
 704                 (id >> 8) & 0xff, (id >> 4) & 0xf, (id >> 1) & 0x7);
 705
 706         return 0;
 707
 708 err_register:
 709 err_get_irq:
 710         iounmap(adapter->hw_addr);
 711 err_ioremap:
 712         free_netdev(netdev);
 713 err_alloc_etherdev:
 714         release_mem_region(iomem->start, resource_size(iomem));
 715 err_mem_region:
 716         return err;
 717 }
 718
 719 static int __devexit ks8842_remove(struct platform_device *pdev)
 720 {
 721         struct net_device *netdev = platform_get_drvdata(pdev);
 722         struct ks8842_adapter *adapter = netdev_priv(netdev);
 723         struct resource *iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 724
 725         unregister_netdev(netdev);
 726         tasklet_kill(&adapter->tasklet);
 727         iounmap(adapter->hw_addr);
 728         free_netdev(netdev);
 729         release_mem_region(iomem->start, resource_size(iomem));
 730         platform_set_drvdata(pdev, NULL);
 731         return 0;
 732 }
 733
 734
 735 static struct platform_driver ks8842_platform_driver = {
 736         .driver = {
 737                 .name   = DRV_NAME,
 738                 .owner  = THIS_MODULE,
 739         },
 740         .probe          = ks8842_probe,
 741         .remove         = ks8842_remove,
 742 };
 743
 744 static int __init ks8842_init(void)
 745 {
 746         return platform_driver_register(&ks8842_platform_driver);
 747 }
 748
 749 static void __exit ks8842_exit(void)
 750 {
 751         platform_driver_unregister(&ks8842_platform_driver);
 752 }
 753
 754 module_init(ks8842_init);
 755 module_exit(ks8842_exit);
 756
 757 MODULE_DESCRIPTION("Timberdale KS8842 ethernet driver");
 758 MODULE_AUTHOR("Mocean Laboratories <info@mocean-labs.com>");
 759 MODULE_LICENSE("GPL v2");
 760 MODULE_ALIAS("platform:ks8842");
 761