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  * The genuine Micrel KS8841/42 device with ISA 16/32bit bus interface
  22  */
  23
  24 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  25
  26 #include <linux/kernel.h>
  27 #include <linux/module.h>
  28 #include <linux/platform_device.h>
  29 #include <linux/netdevice.h>
  30 #include <linux/etherdevice.h>
  31 #include <linux/ethtool.h>
  32 #include <linux/ks8842.h>
  33
  34 #define DRV_NAME "ks8842"
  35
  36 /* Timberdale specific Registers */
  37 #define REG_TIMB_RST    0x1c
  38
  39 /* KS8842 registers */
  40
  41 #define REG_SELECT_BANK 0x0e
  42
  43 /* bank 0 registers */
  44 #define REG_QRFCR       0x04
  45
  46 /* bank 2 registers */
  47 #define REG_MARL        0x00
  48 #define REG_MARM        0x02
  49 #define REG_MARH        0x04
  50
  51 /* bank 3 registers */
  52 #define REG_GRR         0x06
  53
  54 /* bank 16 registers */
  55 #define REG_TXCR        0x00
  56 #define REG_TXSR        0x02
  57 #define REG_RXCR        0x04
  58 #define REG_TXMIR       0x08
  59 #define REG_RXMIR       0x0A
  60
  61 /* bank 17 registers */
  62 #define REG_TXQCR       0x00
  63 #define REG_RXQCR       0x02
  64 #define REG_TXFDPR      0x04
  65 #define REG_RXFDPR      0x06
  66 #define REG_QMU_DATA_LO 0x08
  67 #define REG_QMU_DATA_HI 0x0A
  68
  69 /* bank 18 registers */
  70 #define REG_IER         0x00
  71 #define IRQ_LINK_CHANGE 0x8000
  72 #define IRQ_TX          0x4000
  73 #define IRQ_RX          0x2000
  74 #define IRQ_RX_OVERRUN  0x0800
  75 #define IRQ_TX_STOPPED  0x0200
  76 #define IRQ_RX_STOPPED  0x0100
  77 #define IRQ_RX_ERROR    0x0080
  78 #define ENABLED_IRQS    (IRQ_LINK_CHANGE | IRQ_TX | IRQ_RX | IRQ_RX_STOPPED | \
  79                 IRQ_TX_STOPPED | IRQ_RX_OVERRUN | IRQ_RX_ERROR)
  80 #define REG_ISR         0x02
  81 #define REG_RXSR        0x04
  82 #define RXSR_VALID      0x8000
  83 #define RXSR_BROADCAST  0x80
  84 #define RXSR_MULTICAST  0x40
  85 #define RXSR_UNICAST    0x20
  86 #define RXSR_FRAMETYPE  0x08
  87 #define RXSR_TOO_LONG   0x04
  88 #define RXSR_RUNT       0x02
  89 #define RXSR_CRC_ERROR  0x01
  90 #define RXSR_ERROR      (RXSR_TOO_LONG | RXSR_RUNT | RXSR_CRC_ERROR)
  91
  92 /* bank 32 registers */
  93 #define REG_SW_ID_AND_ENABLE    0x00
  94 #define REG_SGCR1               0x02
  95 #define REG_SGCR2               0x04
  96 #define REG_SGCR3               0x06
  97
  98 /* bank 39 registers */
  99 #define REG_MACAR1              0x00
 100 #define REG_MACAR2              0x02
 101 #define REG_MACAR3              0x04
 102
 103 /* bank 45 registers */
 104 #define REG_P1MBCR              0x00
 105 #define REG_P1MBSR              0x02
 106
 107 /* bank 46 registers */
 108 #define REG_P2MBCR              0x00
 109 #define REG_P2MBSR              0x02
 110
 111 /* bank 48 registers */
 112 #define REG_P1CR2               0x02
 113
 114 /* bank 49 registers */
 115 #define REG_P1CR4               0x02
 116 #define REG_P1SR                0x04
 117
 118 /* flags passed by platform_device for configuration */
 119 #define MICREL_KS884X           0x01    /* 0=Timeberdale(FPGA), 1=Micrel */
 120 #define KS884X_16BIT            0x02    /*  1=16bit, 0=32bit */
 121
 122 struct ks8842_adapter {
 123         void __iomem    *hw_addr;
 124         int             irq;
 125         unsigned long   conf_flags;     /* copy of platform_device config */
 126         struct tasklet_struct   tasklet;
 127         spinlock_t      lock; /* spinlock to be interrupt safe */
 128         struct work_struct timeout_work;
 129         struct net_device *netdev;
 130 };
 131
 132 static inline void ks8842_select_bank(struct ks8842_adapter *adapter, u16 bank)
 133 {
 134         iowrite16(bank, adapter->hw_addr + REG_SELECT_BANK);
 135 }
 136
 137 static inline void ks8842_write8(struct ks8842_adapter *adapter, u16 bank,
 138         u8 value, int offset)
 139 {
 140         ks8842_select_bank(adapter, bank);
 141         iowrite8(value, adapter->hw_addr + offset);
 142 }
 143
 144 static inline void ks8842_write16(struct ks8842_adapter *adapter, u16 bank,
 145         u16 value, int offset)
 146 {
 147         ks8842_select_bank(adapter, bank);
 148         iowrite16(value, adapter->hw_addr + offset);
 149 }
 150
 151 static inline void ks8842_enable_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_clear_bits(struct ks8842_adapter *adapter, u16 bank,
 162         u16 bits, int offset)
 163 {
 164         u16 reg;
 165         ks8842_select_bank(adapter, bank);
 166         reg = ioread16(adapter->hw_addr + offset);
 167         reg &= ~bits;
 168         iowrite16(reg, adapter->hw_addr + offset);
 169 }
 170
 171 static inline void ks8842_write32(struct ks8842_adapter *adapter, u16 bank,
 172         u32 value, int offset)
 173 {
 174         ks8842_select_bank(adapter, bank);
 175         iowrite32(value, adapter->hw_addr + offset);
 176 }
 177
 178 static inline u8 ks8842_read8(struct ks8842_adapter *adapter, u16 bank,
 179         int offset)
 180 {
 181         ks8842_select_bank(adapter, bank);
 182         return ioread8(adapter->hw_addr + offset);
 183 }
 184
 185 static inline u16 ks8842_read16(struct ks8842_adapter *adapter, u16 bank,
 186         int offset)
 187 {
 188         ks8842_select_bank(adapter, bank);
 189         return ioread16(adapter->hw_addr + offset);
 190 }
 191
 192 static inline u32 ks8842_read32(struct ks8842_adapter *adapter, u16 bank,
 193         int offset)
 194 {
 195         ks8842_select_bank(adapter, bank);
 196         return ioread32(adapter->hw_addr + offset);
 197 }
 198
 199 static void ks8842_reset(struct ks8842_adapter *adapter)
 200 {
 201         if (adapter->conf_flags & MICREL_KS884X) {
 202                 ks8842_write16(adapter, 3, 1, REG_GRR);
 203                 msleep(10);
 204                 iowrite16(0, adapter->hw_addr + REG_GRR);
 205         } else {
 206                 /* The KS8842 goes haywire when doing softare reset
 207                 * a work around in the timberdale IP is implemented to
 208                 * do a hardware reset instead
 209                 ks8842_write16(adapter, 3, 1, REG_GRR);
 210                 msleep(10);
 211                 iowrite16(0, adapter->hw_addr + REG_GRR);
 212                 */
 213                 iowrite32(0x1, adapter->hw_addr + REG_TIMB_RST);
 214                 msleep(20);
 215         }
 216 }
 217
 218 static void ks8842_update_link_status(struct net_device *netdev,
 219         struct ks8842_adapter *adapter)
 220 {
 221         /* check the status of the link */
 222         if (ks8842_read16(adapter, 45, REG_P1MBSR) & 0x4) {
 223                 netif_carrier_on(netdev);
 224                 netif_wake_queue(netdev);
 225         } else {
 226                 netif_stop_queue(netdev);
 227                 netif_carrier_off(netdev);
 228         }
 229 }
 230
 231 static void ks8842_enable_tx(struct ks8842_adapter *adapter)
 232 {
 233         ks8842_enable_bits(adapter, 16, 0x01, REG_TXCR);
 234 }
 235
 236 static void ks8842_disable_tx(struct ks8842_adapter *adapter)
 237 {
 238         ks8842_clear_bits(adapter, 16, 0x01, REG_TXCR);
 239 }
 240
 241 static void ks8842_enable_rx(struct ks8842_adapter *adapter)
 242 {
 243         ks8842_enable_bits(adapter, 16, 0x01, REG_RXCR);
 244 }
 245
 246 static void ks8842_disable_rx(struct ks8842_adapter *adapter)
 247 {
 248         ks8842_clear_bits(adapter, 16, 0x01, REG_RXCR);
 249 }
 250
 251 static void ks8842_reset_hw(struct ks8842_adapter *adapter)
 252 {
 253         /* reset the HW */
 254         ks8842_reset(adapter);
 255
 256         /* Enable QMU Transmit flow control / transmit padding / Transmit CRC */
 257         ks8842_write16(adapter, 16, 0x000E, REG_TXCR);
 258
 259         /* enable the receiver, uni + multi + broadcast + flow ctrl
 260                 + crc strip */
 261         ks8842_write16(adapter, 16, 0x8 | 0x20 | 0x40 | 0x80 | 0x400,
 262                 REG_RXCR);
 263
 264         /* TX frame pointer autoincrement */
 265         ks8842_write16(adapter, 17, 0x4000, REG_TXFDPR);
 266
 267         /* RX frame pointer autoincrement */
 268         ks8842_write16(adapter, 17, 0x4000, REG_RXFDPR);
 269
 270         /* RX 2 kb high watermark */
 271         ks8842_write16(adapter, 0, 0x1000, REG_QRFCR);
 272
 273         /* aggresive back off in half duplex */
 274         ks8842_enable_bits(adapter, 32, 1 << 8, REG_SGCR1);
 275
 276         /* enable no excessive collison drop */
 277         ks8842_enable_bits(adapter, 32, 1 << 3, REG_SGCR2);
 278
 279         /* Enable port 1 force flow control / back pressure / transmit / recv */
 280         ks8842_write16(adapter, 48, 0x1E07, REG_P1CR2);
 281
 282         /* restart port auto-negotiation */
 283         ks8842_enable_bits(adapter, 49, 1 << 13, REG_P1CR4);
 284
 285         if (!(adapter->conf_flags & MICREL_KS884X))
 286                 /* only advertise 10Mbps */
 287                 ks8842_clear_bits(adapter, 49, 3 << 2, REG_P1CR4);
 288
 289         /* Enable the transmitter */
 290         ks8842_enable_tx(adapter);
 291
 292         /* Enable the receiver */
 293         ks8842_enable_rx(adapter);
 294
 295         /* clear all interrupts */
 296         ks8842_write16(adapter, 18, 0xffff, REG_ISR);
 297
 298         /* enable interrupts */
 299         ks8842_write16(adapter, 18, ENABLED_IRQS, REG_IER);
 300
 301         /* enable the switch */
 302         ks8842_write16(adapter, 32, 0x1, REG_SW_ID_AND_ENABLE);
 303 }
 304
 305 static void ks8842_read_mac_addr(struct ks8842_adapter *adapter, u8 *dest)
 306 {
 307         int i;
 308         u16 mac;
 309
 310         for (i = 0; i < ETH_ALEN; i++)
 311                 dest[ETH_ALEN - i - 1] = ks8842_read8(adapter, 2, REG_MARL + i);
 312
 313         if (adapter->conf_flags & MICREL_KS884X) {
 314                 /*
 315                 the sequence of saving mac addr between MAC and Switch is
 316                 different.
 317                 */
 318
 319                 mac = ks8842_read16(adapter, 2, REG_MARL);
 320                 ks8842_write16(adapter, 39, mac, REG_MACAR3);
 321                 mac = ks8842_read16(adapter, 2, REG_MARM);
 322                 ks8842_write16(adapter, 39, mac, REG_MACAR2);
 323                 mac = ks8842_read16(adapter, 2, REG_MARH);
 324                 ks8842_write16(adapter, 39, mac, REG_MACAR1);
 325         } else {
 326
 327                 /* make sure the switch port uses the same MAC as the QMU */
 328                 mac = ks8842_read16(adapter, 2, REG_MARL);
 329                 ks8842_write16(adapter, 39, mac, REG_MACAR1);
 330                 mac = ks8842_read16(adapter, 2, REG_MARM);
 331                 ks8842_write16(adapter, 39, mac, REG_MACAR2);
 332                 mac = ks8842_read16(adapter, 2, REG_MARH);
 333                 ks8842_write16(adapter, 39, mac, REG_MACAR3);
 334         }
 335 }
 336
 337 static void ks8842_write_mac_addr(struct ks8842_adapter *adapter, u8 *mac)
 338 {
 339         unsigned long flags;
 340         unsigned i;
 341
 342         spin_lock_irqsave(&adapter->lock, flags);
 343         for (i = 0; i < ETH_ALEN; i++) {
 344                 ks8842_write8(adapter, 2, mac[ETH_ALEN - i - 1], REG_MARL + i);
 345                 if (!(adapter->conf_flags & MICREL_KS884X))
 346                         ks8842_write8(adapter, 39, mac[ETH_ALEN - i - 1],
 347                                 REG_MACAR1 + i);
 348         }
 349
 350         if (adapter->conf_flags & MICREL_KS884X) {
 351                 /*
 352                 the sequence of saving mac addr between MAC and Switch is
 353                 different.
 354                 */
 355
 356                 u16 mac;
 357
 358                 mac = ks8842_read16(adapter, 2, REG_MARL);
 359                 ks8842_write16(adapter, 39, mac, REG_MACAR3);
 360                 mac = ks8842_read16(adapter, 2, REG_MARM);
 361                 ks8842_write16(adapter, 39, mac, REG_MACAR2);
 362                 mac = ks8842_read16(adapter, 2, REG_MARH);
 363                 ks8842_write16(adapter, 39, mac, REG_MACAR1);
 364         }
 365         spin_unlock_irqrestore(&adapter->lock, flags);
 366 }
 367
 368 static inline u16 ks8842_tx_fifo_space(struct ks8842_adapter *adapter)
 369 {
 370         return ks8842_read16(adapter, 16, REG_TXMIR) & 0x1fff;
 371 }
 372
 373 static int ks8842_tx_frame(struct sk_buff *skb, struct net_device *netdev)
 374 {
 375         struct ks8842_adapter *adapter = netdev_priv(netdev);
 376         int len = skb->len;
 377
 378         netdev_dbg(netdev, "%s: len %u head %p data %p tail %p end %p\n",
 379                 __func__, skb->len, skb->head, skb->data,
 380                 skb_tail_pointer(skb), skb_end_pointer(skb));
 381
 382         /* check FIFO buffer space, we need space for CRC and command bits */
 383         if (ks8842_tx_fifo_space(adapter) < len + 8)
 384                 return NETDEV_TX_BUSY;
 385
 386         if (adapter->conf_flags & KS884X_16BIT) {
 387                 u16 *ptr16 = (u16 *)skb->data;
 388                 ks8842_write16(adapter, 17, 0x8000 | 0x100, REG_QMU_DATA_LO);
 389                 ks8842_write16(adapter, 17, (u16)len, REG_QMU_DATA_HI);
 390                 netdev->stats.tx_bytes += len;
 391
 392                 /* copy buffer */
 393                 while (len > 0) {
 394                         iowrite16(*ptr16++, adapter->hw_addr + REG_QMU_DATA_LO);
 395                         iowrite16(*ptr16++, adapter->hw_addr + REG_QMU_DATA_HI);
 396                         len -= sizeof(u32);
 397                 }
 398         } else {
 399
 400                 u32 *ptr = (u32 *)skb->data;
 401                 u32 ctrl;
 402                 /* the control word, enable IRQ, port 1 and the length */
 403                 ctrl = 0x8000 | 0x100 | (len << 16);
 404                 ks8842_write32(adapter, 17, ctrl, REG_QMU_DATA_LO);
 405
 406                 netdev->stats.tx_bytes += len;
 407
 408                 /* copy buffer */
 409                 while (len > 0) {
 410                         iowrite32(*ptr, adapter->hw_addr + REG_QMU_DATA_LO);
 411                         len -= sizeof(u32);
 412                         ptr++;
 413                 }
 414         }
 415
 416         /* enqueue packet */
 417         ks8842_write16(adapter, 17, 1, REG_TXQCR);
 418
 419         dev_kfree_skb(skb);
 420
 421         return NETDEV_TX_OK;
 422 }
 423
 424 static void ks8842_rx_frame(struct net_device *netdev,
 425         struct ks8842_adapter *adapter)
 426 {
 427         u32 status;
 428         int len;
 429
 430         if (adapter->conf_flags & KS884X_16BIT) {
 431                 status = ks8842_read16(adapter, 17, REG_QMU_DATA_LO);
 432                 len = ks8842_read16(adapter, 17, REG_QMU_DATA_HI);
 433                 netdev_dbg(netdev, "%s - rx_data: status: %x\n",
 434                            __func__, status);
 435         } else {
 436                 status = ks8842_read32(adapter, 17, REG_QMU_DATA_LO);
 437                 len = (status >> 16) & 0x7ff;
 438                 status &= 0xffff;
 439                 netdev_dbg(netdev, "%s - rx_data: status: %x\n",
 440                            __func__, status);
 441         }
 442
 443         /* check the status */
 444         if ((status & RXSR_VALID) && !(status & RXSR_ERROR)) {
 445                 struct sk_buff *skb = netdev_alloc_skb_ip_align(netdev, len);
 446
 447                 netdev_dbg(netdev, "%s, got package, len: %d\n", __func__, len);
 448                 if (skb) {
 449
 450                         netdev->stats.rx_packets++;
 451                         netdev->stats.rx_bytes += len;
 452                         if (status & RXSR_MULTICAST)
 453                                 netdev->stats.multicast++;
 454
 455                         if (adapter->conf_flags & KS884X_16BIT) {
 456                                 u16 *data16 = (u16 *)skb_put(skb, len);
 457                                 ks8842_select_bank(adapter, 17);
 458                                 while (len > 0) {
 459                                         *data16++ = ioread16(adapter->hw_addr +
 460                                                 REG_QMU_DATA_LO);
 461                                         *data16++ = ioread16(adapter->hw_addr +
 462                                                 REG_QMU_DATA_HI);
 463                                         len -= sizeof(u32);
 464                                 }
 465                         } else {
 466                                 u32 *data = (u32 *)skb_put(skb, len);
 467
 468                                 ks8842_select_bank(adapter, 17);
 469                                 while (len > 0) {
 470                                         *data++ = ioread32(adapter->hw_addr +
 471                                                 REG_QMU_DATA_LO);
 472                                         len -= sizeof(u32);
 473                                 }
 474                         }
 475                         skb->protocol = eth_type_trans(skb, netdev);
 476                         netif_rx(skb);
 477                 } else
 478                         netdev->stats.rx_dropped++;
 479         } else {
 480                 netdev_dbg(netdev, "RX error, status: %x\n", status);
 481                 netdev->stats.rx_errors++;
 482                 if (status & RXSR_TOO_LONG)
 483                         netdev->stats.rx_length_errors++;
 484                 if (status & RXSR_CRC_ERROR)
 485                         netdev->stats.rx_crc_errors++;
 486                 if (status & RXSR_RUNT)
 487                         netdev->stats.rx_frame_errors++;
 488         }
 489
 490         /* set high watermark to 3K */
 491         ks8842_clear_bits(adapter, 0, 1 << 12, REG_QRFCR);
 492
 493         /* release the frame */
 494         ks8842_write16(adapter, 17, 0x01, REG_RXQCR);
 495
 496         /* set high watermark to 2K */
 497         ks8842_enable_bits(adapter, 0, 1 << 12, REG_QRFCR);
 498 }
 499
 500 void ks8842_handle_rx(struct net_device *netdev, struct ks8842_adapter *adapter)
 501 {
 502         u16 rx_data = ks8842_read16(adapter, 16, REG_RXMIR) & 0x1fff;
 503         netdev_dbg(netdev, "%s Entry - rx_data: %d\n", __func__, rx_data);
 504         while (rx_data) {
 505                 ks8842_rx_frame(netdev, adapter);
 506                 rx_data = ks8842_read16(adapter, 16, REG_RXMIR) & 0x1fff;
 507         }
 508 }
 509
 510 void ks8842_handle_tx(struct net_device *netdev, struct ks8842_adapter *adapter)
 511 {
 512         u16 sr = ks8842_read16(adapter, 16, REG_TXSR);
 513         netdev_dbg(netdev, "%s - entry, sr: %x\n", __func__, sr);
 514         netdev->stats.tx_packets++;
 515         if (netif_queue_stopped(netdev))
 516                 netif_wake_queue(netdev);
 517 }
 518
 519 void ks8842_handle_rx_overrun(struct net_device *netdev,
 520         struct ks8842_adapter *adapter)
 521 {
 522         netdev_dbg(netdev, "%s: entry\n", __func__);
 523         netdev->stats.rx_errors++;
 524         netdev->stats.rx_fifo_errors++;
 525 }
 526
 527 void ks8842_tasklet(unsigned long arg)
 528 {
 529         struct net_device *netdev = (struct net_device *)arg;
 530         struct ks8842_adapter *adapter = netdev_priv(netdev);
 531         u16 isr;
 532         unsigned long flags;
 533         u16 entry_bank;
 534
 535         /* read current bank to be able to set it back */
 536         spin_lock_irqsave(&adapter->lock, flags);
 537         entry_bank = ioread16(adapter->hw_addr + REG_SELECT_BANK);
 538         spin_unlock_irqrestore(&adapter->lock, flags);
 539
 540         isr = ks8842_read16(adapter, 18, REG_ISR);
 541         netdev_dbg(netdev, "%s - ISR: 0x%x\n", __func__, isr);
 542
 543         /* Ack */
 544         ks8842_write16(adapter, 18, isr, REG_ISR);
 545
 546         if (!netif_running(netdev))
 547                 return;
 548
 549         if (isr & IRQ_LINK_CHANGE)
 550                 ks8842_update_link_status(netdev, adapter);
 551
 552         if (isr & (IRQ_RX | IRQ_RX_ERROR))
 553                 ks8842_handle_rx(netdev, adapter);
 554
 555         if (isr & IRQ_TX)
 556                 ks8842_handle_tx(netdev, adapter);
 557
 558         if (isr & IRQ_RX_OVERRUN)
 559                 ks8842_handle_rx_overrun(netdev, adapter);
 560
 561         if (isr & IRQ_TX_STOPPED) {
 562                 ks8842_disable_tx(adapter);
 563                 ks8842_enable_tx(adapter);
 564         }
 565
 566         if (isr & IRQ_RX_STOPPED) {
 567                 ks8842_disable_rx(adapter);
 568                 ks8842_enable_rx(adapter);
 569         }
 570
 571         /* re-enable interrupts, put back the bank selection register */
 572         spin_lock_irqsave(&adapter->lock, flags);
 573         ks8842_write16(adapter, 18, ENABLED_IRQS, REG_IER);
 574         iowrite16(entry_bank, adapter->hw_addr + REG_SELECT_BANK);
 575         spin_unlock_irqrestore(&adapter->lock, flags);
 576 }
 577
 578 static irqreturn_t ks8842_irq(int irq, void *devid)
 579 {
 580         struct net_device *netdev = devid;
 581         struct ks8842_adapter *adapter = netdev_priv(netdev);
 582         u16 isr;
 583         u16 entry_bank = ioread16(adapter->hw_addr + REG_SELECT_BANK);
 584         irqreturn_t ret = IRQ_NONE;
 585
 586         isr = ks8842_read16(adapter, 18, REG_ISR);
 587         netdev_dbg(netdev, "%s - ISR: 0x%x\n", __func__, isr);
 588
 589         if (isr) {
 590                 /* disable IRQ */
 591                 ks8842_write16(adapter, 18, 0x00, REG_IER);
 592
 593                 /* schedule tasklet */
 594                 tasklet_schedule(&adapter->tasklet);
 595
 596                 ret = IRQ_HANDLED;
 597         }
 598
 599         iowrite16(entry_bank, adapter->hw_addr + REG_SELECT_BANK);
 600
 601         return ret;
 602 }
 603
 604
 605 /* Netdevice operations */
 606
 607 static int ks8842_open(struct net_device *netdev)
 608 {
 609         struct ks8842_adapter *adapter = netdev_priv(netdev);
 610         int err;
 611
 612         netdev_dbg(netdev, "%s - entry\n", __func__);
 613
 614         /* reset the HW */
 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         err = request_irq(adapter->irq, ks8842_irq, IRQF_SHARED, DRV_NAME,
 622                 netdev);
 623         if (err) {
 624                 pr_err("Failed to request IRQ: %d: %d\n", adapter->irq, err);
 625                 return err;
 626         }
 627
 628         return 0;
 629 }
 630
 631 static int ks8842_close(struct net_device *netdev)
 632 {
 633         struct ks8842_adapter *adapter = netdev_priv(netdev);
 634
 635         netdev_dbg(netdev, "%s - entry\n", __func__);
 636
 637         cancel_work_sync(&adapter->timeout_work);
 638
 639         /* free the irq */
 640         free_irq(adapter->irq, netdev);
 641
 642         /* disable the switch */
 643         ks8842_write16(adapter, 32, 0x0, REG_SW_ID_AND_ENABLE);
 644
 645         return 0;
 646 }
 647
 648 static netdev_tx_t ks8842_xmit_frame(struct sk_buff *skb,
 649                                      struct net_device *netdev)
 650 {
 651         int ret;
 652         struct ks8842_adapter *adapter = netdev_priv(netdev);
 653
 654         netdev_dbg(netdev, "%s: entry\n", __func__);
 655
 656         ret = ks8842_tx_frame(skb, netdev);
 657
 658         if (ks8842_tx_fifo_space(adapter) <  netdev->mtu + 8)
 659                 netif_stop_queue(netdev);
 660
 661         return ret;
 662 }
 663
 664 static int ks8842_set_mac(struct net_device *netdev, void *p)
 665 {
 666         struct ks8842_adapter *adapter = netdev_priv(netdev);
 667         struct sockaddr *addr = p;
 668         char *mac = (u8 *)addr->sa_data;
 669
 670         netdev_dbg(netdev, "%s: entry\n", __func__);
 671
 672         if (!is_valid_ether_addr(addr->sa_data))
 673                 return -EADDRNOTAVAIL;
 674
 675         memcpy(netdev->dev_addr, mac, netdev->addr_len);
 676
 677         ks8842_write_mac_addr(adapter, mac);
 678         return 0;
 679 }
 680
 681 static void ks8842_tx_timeout_work(struct work_struct *work)
 682 {
 683         struct ks8842_adapter *adapter =
 684                 container_of(work, struct ks8842_adapter, timeout_work);
 685         struct net_device *netdev = adapter->netdev;
 686         unsigned long flags;
 687
 688         netdev_dbg(netdev, "%s: entry\n", __func__);
 689
 690         spin_lock_irqsave(&adapter->lock, flags);
 691         /* disable interrupts */
 692         ks8842_write16(adapter, 18, 0, REG_IER);
 693         ks8842_write16(adapter, 18, 0xFFFF, REG_ISR);
 694
 695         netif_stop_queue(netdev);
 696
 697         spin_unlock_irqrestore(&adapter->lock, flags);
 698
 699         ks8842_reset_hw(adapter);
 700
 701         ks8842_write_mac_addr(adapter, netdev->dev_addr);
 702
 703         ks8842_update_link_status(netdev, adapter);
 704 }
 705
 706 static void ks8842_tx_timeout(struct net_device *netdev)
 707 {
 708         struct ks8842_adapter *adapter = netdev_priv(netdev);
 709
 710         netdev_dbg(netdev, "%s: entry\n", __func__);
 711
 712         schedule_work(&adapter->timeout_work);
 713 }
 714
 715 static const struct net_device_ops ks8842_netdev_ops = {
 716         .ndo_open               = ks8842_open,
 717         .ndo_stop               = ks8842_close,
 718         .ndo_start_xmit         = ks8842_xmit_frame,
 719         .ndo_set_mac_address    = ks8842_set_mac,
 720         .ndo_tx_timeout         = ks8842_tx_timeout,
 721         .ndo_validate_addr      = eth_validate_addr
 722 };
 723
 724 static const struct ethtool_ops ks8842_ethtool_ops = {
 725         .get_link               = ethtool_op_get_link,
 726 };
 727
 728 static int __devinit ks8842_probe(struct platform_device *pdev)
 729 {
 730         int err = -ENOMEM;
 731         struct resource *iomem;
 732         struct net_device *netdev;
 733         struct ks8842_adapter *adapter;
 734         struct ks8842_platform_data *pdata = pdev->dev.platform_data;
 735         u16 id;
 736         unsigned i;
 737
 738         iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 739         if (!request_mem_region(iomem->start, resource_size(iomem), DRV_NAME))
 740                 goto err_mem_region;
 741
 742         netdev = alloc_etherdev(sizeof(struct ks8842_adapter));
 743         if (!netdev)
 744                 goto err_alloc_etherdev;
 745
 746         SET_NETDEV_DEV(netdev, &pdev->dev);
 747
 748         adapter = netdev_priv(netdev);
 749         adapter->netdev = netdev;
 750         INIT_WORK(&adapter->timeout_work, ks8842_tx_timeout_work);
 751         adapter->hw_addr = ioremap(iomem->start, resource_size(iomem));
 752         adapter->conf_flags = iomem->flags;
 753
 754         if (!adapter->hw_addr)
 755                 goto err_ioremap;
 756
 757         adapter->irq = platform_get_irq(pdev, 0);
 758         if (adapter->irq < 0) {
 759                 err = adapter->irq;
 760                 goto err_get_irq;
 761         }
 762
 763         tasklet_init(&adapter->tasklet, ks8842_tasklet, (unsigned long)netdev);
 764         spin_lock_init(&adapter->lock);
 765
 766         netdev->netdev_ops = &ks8842_netdev_ops;
 767         netdev->ethtool_ops = &ks8842_ethtool_ops;
 768
 769         /* Check if a mac address was given */
 770         i = netdev->addr_len;
 771         if (pdata) {
 772                 for (i = 0; i < netdev->addr_len; i++)
 773                         if (pdata->macaddr[i] != 0)
 774                                 break;
 775
 776                 if (i < netdev->addr_len)
 777                         /* an address was passed, use it */
 778                         memcpy(netdev->dev_addr, pdata->macaddr,
 779                                 netdev->addr_len);
 780         }
 781
 782         if (i == netdev->addr_len) {
 783                 ks8842_read_mac_addr(adapter, netdev->dev_addr);
 784
 785                 if (!is_valid_ether_addr(netdev->dev_addr))
 786                         random_ether_addr(netdev->dev_addr);
 787         }
 788
 789         id = ks8842_read16(adapter, 32, REG_SW_ID_AND_ENABLE);
 790
 791         strcpy(netdev->name, "eth%d");
 792         err = register_netdev(netdev);
 793         if (err)
 794                 goto err_register;
 795
 796         platform_set_drvdata(pdev, netdev);
 797
 798         pr_info("Found chip, family: 0x%x, id: 0x%x, rev: 0x%x\n",
 799                 (id >> 8) & 0xff, (id >> 4) & 0xf, (id >> 1) & 0x7);
 800
 801         return 0;
 802
 803 err_register:
 804 err_get_irq:
 805         iounmap(adapter->hw_addr);
 806 err_ioremap:
 807         free_netdev(netdev);
 808 err_alloc_etherdev:
 809         release_mem_region(iomem->start, resource_size(iomem));
 810 err_mem_region:
 811         return err;
 812 }
 813
 814 static int __devexit ks8842_remove(struct platform_device *pdev)
 815 {
 816         struct net_device *netdev = platform_get_drvdata(pdev);
 817         struct ks8842_adapter *adapter = netdev_priv(netdev);
 818         struct resource *iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 819
 820         unregister_netdev(netdev);
 821         tasklet_kill(&adapter->tasklet);
 822         iounmap(adapter->hw_addr);
 823         free_netdev(netdev);
 824         release_mem_region(iomem->start, resource_size(iomem));
 825         platform_set_drvdata(pdev, NULL);
 826         return 0;
 827 }
 828
 829
 830 static struct platform_driver ks8842_platform_driver = {
 831         .driver = {
 832                 .name   = DRV_NAME,
 833                 .owner  = THIS_MODULE,
 834         },
 835         .probe          = ks8842_probe,
 836         .remove         = ks8842_remove,
 837 };
 838
 839 static int __init ks8842_init(void)
 840 {
 841         return platform_driver_register(&ks8842_platform_driver);
 842 }
 843
 844 static void __exit ks8842_exit(void)
 845 {
 846         platform_driver_unregister(&ks8842_platform_driver);
 847 }
 848
 849 module_init(ks8842_init);
 850 module_exit(ks8842_exit);
 851
 852 MODULE_DESCRIPTION("Timberdale KS8842 ethernet driver");
 853 MODULE_AUTHOR("Mocean Laboratories <info@mocean-labs.com>");
 854 MODULE_LICENSE("GPL v2");
 855 MODULE_ALIAS("platform:ks8842");
 856