drivers/net/pch_gbe/pch_gbe_main.c

   1 /*
   2  * Copyright (C) 1999 - 2010 Intel Corporation.
   3  * Copyright (C) 2010 OKI SEMICONDUCTOR CO., LTD.
   4  *
   5  * This code was derived from the Intel e1000e Linux driver.
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; version 2 of the License.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307, USA.
  19  */
  20
  21 #include "pch_gbe.h"
  22 #include "pch_gbe_api.h"
  23
  24 #define DRV_VERSION     "1.00"
  25 const char pch_driver_version[] = DRV_VERSION;
  26
  27 #define PCI_DEVICE_ID_INTEL_IOH1_GBE    0x8802          /* Pci device ID */
  28 #define PCH_GBE_MAR_ENTRIES             16
  29 #define PCH_GBE_SHORT_PKT               64
  30 #define DSC_INIT16                      0xC000
  31 #define PCH_GBE_DMA_ALIGN               0
  32 #define PCH_GBE_DMA_PADDING             2
  33 #define PCH_GBE_WATCHDOG_PERIOD         (1 * HZ)        /* watchdog time */
  34 #define PCH_GBE_COPYBREAK_DEFAULT       256
  35 #define PCH_GBE_PCI_BAR                 1
  36 #define PCH_GBE_RESERVE_MEMORY          0x200000        /* 2MB */
  37
  38 /* Macros for ML7223 */
  39 #define PCI_VENDOR_ID_ROHM                      0x10db
  40 #define PCI_DEVICE_ID_ROHM_ML7223_GBE           0x8013
  41
  42 /* Macros for ML7831 */
  43 #define PCI_DEVICE_ID_ROHM_ML7831_GBE           0x8802
  44
  45 #define PCH_GBE_TX_WEIGHT         64
  46 #define PCH_GBE_RX_WEIGHT         64
  47 #define PCH_GBE_RX_BUFFER_WRITE   16
  48
  49 /* Initialize the wake-on-LAN settings */
  50 #define PCH_GBE_WL_INIT_SETTING    (PCH_GBE_WLC_MP)
  51
  52 #define PCH_GBE_MAC_RGMII_CTRL_SETTING ( \
  53         PCH_GBE_CHIP_TYPE_INTERNAL | \
  54         PCH_GBE_RGMII_MODE_RGMII     \
  55         )
  56
  57 /* Ethertype field values */
  58 #define PCH_GBE_MAX_RX_BUFFER_SIZE      0x2880
  59 #define PCH_GBE_MAX_JUMBO_FRAME_SIZE    10318
  60 #define PCH_GBE_FRAME_SIZE_2048         2048
  61 #define PCH_GBE_FRAME_SIZE_4096         4096
  62 #define PCH_GBE_FRAME_SIZE_8192         8192
  63
  64 #define PCH_GBE_GET_DESC(R, i, type)    (&(((struct type *)((R).desc))[i]))
  65 #define PCH_GBE_RX_DESC(R, i)           PCH_GBE_GET_DESC(R, i, pch_gbe_rx_desc)
  66 #define PCH_GBE_TX_DESC(R, i)           PCH_GBE_GET_DESC(R, i, pch_gbe_tx_desc)
  67 #define PCH_GBE_DESC_UNUSED(R) \
  68         ((((R)->next_to_clean > (R)->next_to_use) ? 0 : (R)->count) + \
  69         (R)->next_to_clean - (R)->next_to_use - 1)
  70
  71 /* Pause packet value */
  72 #define PCH_GBE_PAUSE_PKT1_VALUE    0x00C28001
  73 #define PCH_GBE_PAUSE_PKT2_VALUE    0x00000100
  74 #define PCH_GBE_PAUSE_PKT4_VALUE    0x01000888
  75 #define PCH_GBE_PAUSE_PKT5_VALUE    0x0000FFFF
  76
  77 #define PCH_GBE_ETH_ALEN            6
  78
  79 /* This defines the bits that are set in the Interrupt Mask
  80  * Set/Read Register.  Each bit is documented below:
  81  *   o RXT0   = Receiver Timer Interrupt (ring 0)
  82  *   o TXDW   = Transmit Descriptor Written Back
  83  *   o RXDMT0 = Receive Descriptor Minimum Threshold hit (ring 0)
  84  *   o RXSEQ  = Receive Sequence Error
  85  *   o LSC    = Link Status Change
  86  */
  87 #define PCH_GBE_INT_ENABLE_MASK ( \
  88         PCH_GBE_INT_RX_DMA_CMPLT |    \
  89         PCH_GBE_INT_RX_DSC_EMP   |    \
  90         PCH_GBE_INT_RX_FIFO_ERR  |    \
  91         PCH_GBE_INT_WOL_DET      |    \
  92         PCH_GBE_INT_TX_CMPLT          \
  93         )
  94
  95 #define PCH_GBE_INT_DISABLE_ALL         0
  96
  97 static unsigned int copybreak __read_mostly = PCH_GBE_COPYBREAK_DEFAULT;
  98
  99 static int pch_gbe_mdio_read(struct net_device *netdev, int addr, int reg);
 100 static void pch_gbe_mdio_write(struct net_device *netdev, int addr, int reg,
 101                                int data);
 102
 103 inline void pch_gbe_mac_load_mac_addr(struct pch_gbe_hw *hw)
 104 {
 105         iowrite32(0x01, &hw->reg->MAC_ADDR_LOAD);
 106 }
 107
 108 /**
 109  * pch_gbe_mac_read_mac_addr - Read MAC address
 110  * @hw:             Pointer to the HW structure
 111  * Returns
 112  *      0:                      Successful.
 113  */
 114 s32 pch_gbe_mac_read_mac_addr(struct pch_gbe_hw *hw)
 115 {
 116         u32  adr1a, adr1b;
 117
 118         adr1a = ioread32(&hw->reg->mac_adr[0].high);
 119         adr1b = ioread32(&hw->reg->mac_adr[0].low);
 120
 121         hw->mac.addr[0] = (u8)(adr1a & 0xFF);
 122         hw->mac.addr[1] = (u8)((adr1a >> 8) & 0xFF);
 123         hw->mac.addr[2] = (u8)((adr1a >> 16) & 0xFF);
 124         hw->mac.addr[3] = (u8)((adr1a >> 24) & 0xFF);
 125         hw->mac.addr[4] = (u8)(adr1b & 0xFF);
 126         hw->mac.addr[5] = (u8)((adr1b >> 8) & 0xFF);
 127
 128         pr_debug("hw->mac.addr : %pM\n", hw->mac.addr);
 129         return 0;
 130 }
 131
 132 /**
 133  * pch_gbe_wait_clr_bit - Wait to clear a bit
 134  * @reg:        Pointer of register
 135  * @busy:       Busy bit
 136  */
 137 static void pch_gbe_wait_clr_bit(void *reg, u32 bit)
 138 {
 139         u32 tmp;
 140         /* wait busy */
 141         tmp = 1000;
 142         while ((ioread32(reg) & bit) && --tmp)
 143                 cpu_relax();
 144         if (!tmp)
 145                 pr_err("Error: busy bit is not cleared\n");
 146 }
 147
 148 /**
 149  * pch_gbe_wait_clr_bit_irq - Wait to clear a bit for interrupt context
 150  * @reg:        Pointer of register
 151  * @busy:       Busy bit
 152  */
 153 static int pch_gbe_wait_clr_bit_irq(void *reg, u32 bit)
 154 {
 155         u32 tmp;
 156         int ret = -1;
 157         /* wait busy */
 158         tmp = 20;
 159         while ((ioread32(reg) & bit) && --tmp)
 160                 udelay(5);
 161         if (!tmp)
 162                 pr_err("Error: busy bit is not cleared\n");
 163         else
 164                 ret = 0;
 165         return ret;
 166 }
 167
 168 /**
 169  * pch_gbe_mac_mar_set - Set MAC address register
 170  * @hw:     Pointer to the HW structure
 171  * @addr:   Pointer to the MAC address
 172  * @index:  MAC address array register
 173  */
 174 static void pch_gbe_mac_mar_set(struct pch_gbe_hw *hw, u8 * addr, u32 index)
 175 {
 176         u32 mar_low, mar_high, adrmask;
 177
 178         pr_debug("index : 0x%x\n", index);
 179
 180         /*
 181          * HW expects these in little endian so we reverse the byte order
 182          * from network order (big endian) to little endian
 183          */
 184         mar_high = ((u32) addr[0] | ((u32) addr[1] << 8) |
 185                    ((u32) addr[2] << 16) | ((u32) addr[3] << 24));
 186         mar_low = ((u32) addr[4] | ((u32) addr[5] << 8));
 187         /* Stop the MAC Address of index. */
 188         adrmask = ioread32(&hw->reg->ADDR_MASK);
 189         iowrite32((adrmask | (0x0001 << index)), &hw->reg->ADDR_MASK);
 190         /* wait busy */
 191         pch_gbe_wait_clr_bit(&hw->reg->ADDR_MASK, PCH_GBE_BUSY);
 192         /* Set the MAC address to the MAC address 1A/1B register */
 193         iowrite32(mar_high, &hw->reg->mac_adr[index].high);
 194         iowrite32(mar_low, &hw->reg->mac_adr[index].low);
 195         /* Start the MAC address of index */
 196         iowrite32((adrmask & ~(0x0001 << index)), &hw->reg->ADDR_MASK);
 197         /* wait busy */
 198         pch_gbe_wait_clr_bit(&hw->reg->ADDR_MASK, PCH_GBE_BUSY);
 199 }
 200
 201 /**
 202  * pch_gbe_mac_reset_hw - Reset hardware
 203  * @hw: Pointer to the HW structure
 204  */
 205 static void pch_gbe_mac_reset_hw(struct pch_gbe_hw *hw)
 206 {
 207         /* Read the MAC address. and store to the private data */
 208         pch_gbe_mac_read_mac_addr(hw);
 209         iowrite32(PCH_GBE_ALL_RST, &hw->reg->RESET);
 210 #ifdef PCH_GBE_MAC_IFOP_RGMII
 211         iowrite32(PCH_GBE_MODE_GMII_ETHER, &hw->reg->MODE);
 212 #endif
 213         pch_gbe_wait_clr_bit(&hw->reg->RESET, PCH_GBE_ALL_RST);
 214         /* Setup the receive address */
 215         pch_gbe_mac_mar_set(hw, hw->mac.addr, 0);
 216         return;
 217 }
 218
 219 static void pch_gbe_mac_reset_rx(struct pch_gbe_hw *hw)
 220 {
 221         /* Read the MAC address. and store to the private data */
 222         pch_gbe_mac_read_mac_addr(hw);
 223         iowrite32(PCH_GBE_RX_RST, &hw->reg->RESET);
 224         pch_gbe_wait_clr_bit_irq(&hw->reg->RESET, PCH_GBE_RX_RST);
 225         /* Setup the MAC address */
 226         pch_gbe_mac_mar_set(hw, hw->mac.addr, 0);
 227         return;
 228 }
 229
 230 /**
 231  * pch_gbe_mac_init_rx_addrs - Initialize receive address's
 232  * @hw: Pointer to the HW structure
 233  * @mar_count: Receive address registers
 234  */
 235 static void pch_gbe_mac_init_rx_addrs(struct pch_gbe_hw *hw, u16 mar_count)
 236 {
 237         u32 i;
 238
 239         /* Setup the receive address */
 240         pch_gbe_mac_mar_set(hw, hw->mac.addr, 0);
 241
 242         /* Zero out the other receive addresses */
 243         for (i = 1; i < mar_count; i++) {
 244                 iowrite32(0, &hw->reg->mac_adr[i].high);
 245                 iowrite32(0, &hw->reg->mac_adr[i].low);
 246         }
 247         iowrite32(0xFFFE, &hw->reg->ADDR_MASK);
 248         /* wait busy */
 249         pch_gbe_wait_clr_bit(&hw->reg->ADDR_MASK, PCH_GBE_BUSY);
 250 }
 251
 252
 253 /**
 254  * pch_gbe_mac_mc_addr_list_update - Update Multicast addresses
 255  * @hw:             Pointer to the HW structure
 256  * @mc_addr_list:   Array of multicast addresses to program
 257  * @mc_addr_count:  Number of multicast addresses to program
 258  * @mar_used_count: The first MAC Address register free to program
 259  * @mar_total_num:  Total number of supported MAC Address Registers
 260  */
 261 static void pch_gbe_mac_mc_addr_list_update(struct pch_gbe_hw *hw,
 262                                             u8 *mc_addr_list, u32 mc_addr_count,
 263                                             u32 mar_used_count, u32 mar_total_num)
 264 {
 265         u32 i, adrmask;
 266
 267         /* Load the first set of multicast addresses into the exact
 268          * filters (RAR).  If there are not enough to fill the RAR
 269          * array, clear the filters.
 270          */
 271         for (i = mar_used_count; i < mar_total_num; i++) {
 272                 if (mc_addr_count) {
 273                         pch_gbe_mac_mar_set(hw, mc_addr_list, i);
 274                         mc_addr_count--;
 275                         mc_addr_list += PCH_GBE_ETH_ALEN;
 276                 } else {
 277                         /* Clear MAC address mask */
 278                         adrmask = ioread32(&hw->reg->ADDR_MASK);
 279                         iowrite32((adrmask | (0x0001 << i)),
 280                                         &hw->reg->ADDR_MASK);
 281                         /* wait busy */
 282                         pch_gbe_wait_clr_bit(&hw->reg->ADDR_MASK, PCH_GBE_BUSY);
 283                         /* Clear MAC address */
 284                         iowrite32(0, &hw->reg->mac_adr[i].high);
 285                         iowrite32(0, &hw->reg->mac_adr[i].low);
 286                 }
 287         }
 288 }
 289
 290 /**
 291  * pch_gbe_mac_force_mac_fc - Force the MAC's flow control settings
 292  * @hw:             Pointer to the HW structure
 293  * Returns
 294  *      0:                      Successful.
 295  *      Negative value:         Failed.
 296  */
 297 s32 pch_gbe_mac_force_mac_fc(struct pch_gbe_hw *hw)
 298 {
 299         struct pch_gbe_mac_info *mac = &hw->mac;
 300         u32 rx_fctrl;
 301
 302         pr_debug("mac->fc = %u\n", mac->fc);
 303
 304         rx_fctrl = ioread32(&hw->reg->RX_FCTRL);
 305
 306         switch (mac->fc) {
 307         case PCH_GBE_FC_NONE:
 308                 rx_fctrl &= ~PCH_GBE_FL_CTRL_EN;
 309                 mac->tx_fc_enable = false;
 310                 break;
 311         case PCH_GBE_FC_RX_PAUSE:
 312                 rx_fctrl |= PCH_GBE_FL_CTRL_EN;
 313                 mac->tx_fc_enable = false;
 314                 break;
 315         case PCH_GBE_FC_TX_PAUSE:
 316                 rx_fctrl &= ~PCH_GBE_FL_CTRL_EN;
 317                 mac->tx_fc_enable = true;
 318                 break;
 319         case PCH_GBE_FC_FULL:
 320                 rx_fctrl |= PCH_GBE_FL_CTRL_EN;
 321                 mac->tx_fc_enable = true;
 322                 break;
 323         default:
 324                 pr_err("Flow control param set incorrectly\n");
 325                 return -EINVAL;
 326         }
 327         if (mac->link_duplex == DUPLEX_HALF)
 328                 rx_fctrl &= ~PCH_GBE_FL_CTRL_EN;
 329         iowrite32(rx_fctrl, &hw->reg->RX_FCTRL);
 330         pr_debug("RX_FCTRL reg : 0x%08x  mac->tx_fc_enable : %d\n",
 331                  ioread32(&hw->reg->RX_FCTRL), mac->tx_fc_enable);
 332         return 0;
 333 }
 334
 335 /**
 336  * pch_gbe_mac_set_wol_event - Set wake-on-lan event
 337  * @hw:     Pointer to the HW structure
 338  * @wu_evt: Wake up event
 339  */
 340 static void pch_gbe_mac_set_wol_event(struct pch_gbe_hw *hw, u32 wu_evt)
 341 {
 342         u32 addr_mask;
 343
 344         pr_debug("wu_evt : 0x%08x  ADDR_MASK reg : 0x%08x\n",
 345                  wu_evt, ioread32(&hw->reg->ADDR_MASK));
 346
 347         if (wu_evt) {
 348                 /* Set Wake-On-Lan address mask */
 349                 addr_mask = ioread32(&hw->reg->ADDR_MASK);
 350                 iowrite32(addr_mask, &hw->reg->WOL_ADDR_MASK);
 351                 /* wait busy */
 352                 pch_gbe_wait_clr_bit(&hw->reg->WOL_ADDR_MASK, PCH_GBE_WLA_BUSY);
 353                 iowrite32(0, &hw->reg->WOL_ST);
 354                 iowrite32((wu_evt | PCH_GBE_WLC_WOL_MODE), &hw->reg->WOL_CTRL);
 355                 iowrite32(0x02, &hw->reg->TCPIP_ACC);
 356                 iowrite32(PCH_GBE_INT_ENABLE_MASK, &hw->reg->INT_EN);
 357         } else {
 358                 iowrite32(0, &hw->reg->WOL_CTRL);
 359                 iowrite32(0, &hw->reg->WOL_ST);
 360         }
 361         return;
 362 }
 363
 364 /**
 365  * pch_gbe_mac_ctrl_miim - Control MIIM interface
 366  * @hw:   Pointer to the HW structure
 367  * @addr: Address of PHY
 368  * @dir:  Operetion. (Write or Read)
 369  * @reg:  Access register of PHY
 370  * @data: Write data.
 371  *
 372  * Returns: Read date.
 373  */
 374 u16 pch_gbe_mac_ctrl_miim(struct pch_gbe_hw *hw, u32 addr, u32 dir, u32 reg,
 375                         u16 data)
 376 {
 377         u32 data_out = 0;
 378         unsigned int i;
 379         unsigned long flags;
 380
 381         spin_lock_irqsave(&hw->miim_lock, flags);
 382
 383         for (i = 100; i; --i) {
 384                 if ((ioread32(&hw->reg->MIIM) & PCH_GBE_MIIM_OPER_READY))
 385                         break;
 386                 udelay(20);
 387         }
 388         if (i == 0) {
 389                 pr_err("pch-gbe.miim won't go Ready\n");
 390                 spin_unlock_irqrestore(&hw->miim_lock, flags);
 391                 return 0;       /* No way to indicate timeout error */
 392         }
 393         iowrite32(((reg << PCH_GBE_MIIM_REG_ADDR_SHIFT) |
 394                   (addr << PCH_GBE_MIIM_PHY_ADDR_SHIFT) |
 395                   dir | data), &hw->reg->MIIM);
 396         for (i = 0; i < 100; i++) {
 397                 udelay(20);
 398                 data_out = ioread32(&hw->reg->MIIM);
 399                 if ((data_out & PCH_GBE_MIIM_OPER_READY))
 400                         break;
 401         }
 402         spin_unlock_irqrestore(&hw->miim_lock, flags);
 403
 404         pr_debug("PHY %s: reg=%d, data=0x%04X\n",
 405                  dir == PCH_GBE_MIIM_OPER_READ ? "READ" : "WRITE", reg,
 406                  dir == PCH_GBE_MIIM_OPER_READ ? data_out : data);
 407         return (u16) data_out;
 408 }
 409
 410 /**
 411  * pch_gbe_mac_set_pause_packet - Set pause packet
 412  * @hw:   Pointer to the HW structure
 413  */
 414 static void pch_gbe_mac_set_pause_packet(struct pch_gbe_hw *hw)
 415 {
 416         unsigned long tmp2, tmp3;
 417
 418         /* Set Pause packet */
 419         tmp2 = hw->mac.addr[1];
 420         tmp2 = (tmp2 << 8) | hw->mac.addr[0];
 421         tmp2 = PCH_GBE_PAUSE_PKT2_VALUE | (tmp2 << 16);
 422
 423         tmp3 = hw->mac.addr[5];
 424         tmp3 = (tmp3 << 8) | hw->mac.addr[4];
 425         tmp3 = (tmp3 << 8) | hw->mac.addr[3];
 426         tmp3 = (tmp3 << 8) | hw->mac.addr[2];
 427
 428         iowrite32(PCH_GBE_PAUSE_PKT1_VALUE, &hw->reg->PAUSE_PKT1);
 429         iowrite32(tmp2, &hw->reg->PAUSE_PKT2);
 430         iowrite32(tmp3, &hw->reg->PAUSE_PKT3);
 431         iowrite32(PCH_GBE_PAUSE_PKT4_VALUE, &hw->reg->PAUSE_PKT4);
 432         iowrite32(PCH_GBE_PAUSE_PKT5_VALUE, &hw->reg->PAUSE_PKT5);
 433
 434         /* Transmit Pause Packet */
 435         iowrite32(PCH_GBE_PS_PKT_RQ, &hw->reg->PAUSE_REQ);
 436
 437         pr_debug("PAUSE_PKT1-5 reg : 0x%08x 0x%08x 0x%08x 0x%08x 0x%08x\n",
 438                  ioread32(&hw->reg->PAUSE_PKT1), ioread32(&hw->reg->PAUSE_PKT2),
 439                  ioread32(&hw->reg->PAUSE_PKT3), ioread32(&hw->reg->PAUSE_PKT4),
 440                  ioread32(&hw->reg->PAUSE_PKT5));
 441
 442         return;
 443 }
 444
 445
 446 /**
 447  * pch_gbe_alloc_queues - Allocate memory for all rings
 448  * @adapter:  Board private structure to initialize
 449  * Returns
 450  *      0:      Successfully
 451  *      Negative value: Failed
 452  */
 453 static int pch_gbe_alloc_queues(struct pch_gbe_adapter *adapter)
 454 {
 455         int size;
 456
 457         size = (int)sizeof(struct pch_gbe_tx_ring);
 458         adapter->tx_ring = kzalloc(size, GFP_KERNEL);
 459         if (!adapter->tx_ring)
 460                 return -ENOMEM;
 461         size = (int)sizeof(struct pch_gbe_rx_ring);
 462         adapter->rx_ring = kzalloc(size, GFP_KERNEL);
 463         if (!adapter->rx_ring) {
 464                 kfree(adapter->tx_ring);
 465                 return -ENOMEM;
 466         }
 467         return 0;
 468 }
 469
 470 /**
 471  * pch_gbe_init_stats - Initialize status
 472  * @adapter:  Board private structure to initialize
 473  */
 474 static void pch_gbe_init_stats(struct pch_gbe_adapter *adapter)
 475 {
 476         memset(&adapter->stats, 0, sizeof(adapter->stats));
 477         return;
 478 }
 479
 480 /**
 481  * pch_gbe_init_phy - Initialize PHY
 482  * @adapter:  Board private structure to initialize
 483  * Returns
 484  *      0:      Successfully
 485  *      Negative value: Failed
 486  */
 487 static int pch_gbe_init_phy(struct pch_gbe_adapter *adapter)
 488 {
 489         struct net_device *netdev = adapter->netdev;
 490         u32 addr;
 491         u16 bmcr, stat;
 492
 493         /* Discover phy addr by searching addrs in order {1,0,2,..., 31} */
 494         for (addr = 0; addr < PCH_GBE_PHY_REGS_LEN; addr++) {
 495                 adapter->mii.phy_id = (addr == 0) ? 1 : (addr == 1) ? 0 : addr;
 496                 bmcr = pch_gbe_mdio_read(netdev, adapter->mii.phy_id, MII_BMCR);
 497                 stat = pch_gbe_mdio_read(netdev, adapter->mii.phy_id, MII_BMSR);
 498                 stat = pch_gbe_mdio_read(netdev, adapter->mii.phy_id, MII_BMSR);
 499                 if (!((bmcr == 0xFFFF) || ((stat == 0) && (bmcr == 0))))
 500                         break;
 501         }
 502         adapter->hw.phy.addr = adapter->mii.phy_id;
 503         pr_debug("phy_addr = %d\n", adapter->mii.phy_id);
 504         if (addr == 32)
 505                 return -EAGAIN;
 506         /* Selected the phy and isolate the rest */
 507         for (addr = 0; addr < PCH_GBE_PHY_REGS_LEN; addr++) {
 508                 if (addr != adapter->mii.phy_id) {
 509                         pch_gbe_mdio_write(netdev, addr, MII_BMCR,
 510                                            BMCR_ISOLATE);
 511                 } else {
 512                         bmcr = pch_gbe_mdio_read(netdev, addr, MII_BMCR);
 513                         pch_gbe_mdio_write(netdev, addr, MII_BMCR,
 514                                            bmcr & ~BMCR_ISOLATE);
 515                 }
 516         }
 517
 518         /* MII setup */
 519         adapter->mii.phy_id_mask = 0x1F;
 520         adapter->mii.reg_num_mask = 0x1F;
 521         adapter->mii.dev = adapter->netdev;
 522         adapter->mii.mdio_read = pch_gbe_mdio_read;
 523         adapter->mii.mdio_write = pch_gbe_mdio_write;
 524         adapter->mii.supports_gmii = mii_check_gmii_support(&adapter->mii);
 525         return 0;
 526 }
 527
 528 /**
 529  * pch_gbe_mdio_read - The read function for mii
 530  * @netdev: Network interface device structure
 531  * @addr:   Phy ID
 532  * @reg:    Access location
 533  * Returns
 534  *      0:      Successfully
 535  *      Negative value: Failed
 536  */
 537 static int pch_gbe_mdio_read(struct net_device *netdev, int addr, int reg)
 538 {
 539         struct pch_gbe_adapter *adapter = netdev_priv(netdev);
 540         struct pch_gbe_hw *hw = &adapter->hw;
 541
 542         return pch_gbe_mac_ctrl_miim(hw, addr, PCH_GBE_HAL_MIIM_READ, reg,
 543                                      (u16) 0);
 544 }
 545
 546 /**
 547  * pch_gbe_mdio_write - The write function for mii
 548  * @netdev: Network interface device structure
 549  * @addr:   Phy ID (not used)
 550  * @reg:    Access location
 551  * @data:   Write data
 552  */
 553 static void pch_gbe_mdio_write(struct net_device *netdev,
 554                                int addr, int reg, int data)
 555 {
 556         struct pch_gbe_adapter *adapter = netdev_priv(netdev);
 557         struct pch_gbe_hw *hw = &adapter->hw;
 558
 559         pch_gbe_mac_ctrl_miim(hw, addr, PCH_GBE_HAL_MIIM_WRITE, reg, data);
 560 }
 561
 562 /**
 563  * pch_gbe_reset_task - Reset processing at the time of transmission timeout
 564  * @work:  Pointer of board private structure
 565  */
 566 static void pch_gbe_reset_task(struct work_struct *work)
 567 {
 568         struct pch_gbe_adapter *adapter;
 569         adapter = container_of(work, struct pch_gbe_adapter, reset_task);
 570
 571         rtnl_lock();
 572         pch_gbe_reinit_locked(adapter);
 573         rtnl_unlock();
 574 }
 575
 576 /**
 577  * pch_gbe_reinit_locked- Re-initialization
 578  * @adapter:  Board private structure
 579  */
 580 void pch_gbe_reinit_locked(struct pch_gbe_adapter *adapter)
 581 {
 582         pch_gbe_down(adapter);
 583         pch_gbe_up(adapter);
 584 }
 585
 586 /**
 587  * pch_gbe_reset - Reset GbE
 588  * @adapter:  Board private structure
 589  */
 590 void pch_gbe_reset(struct pch_gbe_adapter *adapter)
 591 {
 592         pch_gbe_mac_reset_hw(&adapter->hw);
 593         /* Setup the receive address. */
 594         pch_gbe_mac_init_rx_addrs(&adapter->hw, PCH_GBE_MAR_ENTRIES);
 595         if (pch_gbe_hal_init_hw(&adapter->hw))
 596                 pr_err("Hardware Error\n");
 597 }
 598
 599 /**
 600  * pch_gbe_free_irq - Free an interrupt
 601  * @adapter:  Board private structure
 602  */
 603 static void pch_gbe_free_irq(struct pch_gbe_adapter *adapter)
 604 {
 605         struct net_device *netdev = adapter->netdev;
 606
 607         free_irq(adapter->pdev->irq, netdev);
 608         if (adapter->have_msi) {
 609                 pci_disable_msi(adapter->pdev);
 610                 pr_debug("call pci_disable_msi\n");
 611         }
 612 }
 613
 614 /**
 615  * pch_gbe_irq_disable - Mask off interrupt generation on the NIC
 616  * @adapter:  Board private structure
 617  */
 618 static void pch_gbe_irq_disable(struct pch_gbe_adapter *adapter)
 619 {
 620         struct pch_gbe_hw *hw = &adapter->hw;
 621
 622         atomic_inc(&adapter->irq_sem);
 623         iowrite32(0, &hw->reg->INT_EN);
 624         ioread32(&hw->reg->INT_ST);
 625         synchronize_irq(adapter->pdev->irq);
 626
 627         pr_debug("INT_EN reg : 0x%08x\n", ioread32(&hw->reg->INT_EN));
 628 }
 629
 630 /**
 631  * pch_gbe_irq_enable - Enable default interrupt generation settings
 632  * @adapter:  Board private structure
 633  */
 634 static void pch_gbe_irq_enable(struct pch_gbe_adapter *adapter)
 635 {
 636         struct pch_gbe_hw *hw = &adapter->hw;
 637
 638         if (likely(atomic_dec_and_test(&adapter->irq_sem)))
 639                 iowrite32(PCH_GBE_INT_ENABLE_MASK, &hw->reg->INT_EN);
 640         ioread32(&hw->reg->INT_ST);
 641         pr_debug("INT_EN reg : 0x%08x\n", ioread32(&hw->reg->INT_EN));
 642 }
 643
 644
 645
 646 /**
 647  * pch_gbe_setup_tctl - configure the Transmit control registers
 648  * @adapter:  Board private structure
 649  */
 650 static void pch_gbe_setup_tctl(struct pch_gbe_adapter *adapter)
 651 {
 652         struct pch_gbe_hw *hw = &adapter->hw;
 653         u32 tx_mode, tcpip;
 654
 655         tx_mode = PCH_GBE_TM_LONG_PKT |
 656                 PCH_GBE_TM_ST_AND_FD |
 657                 PCH_GBE_TM_SHORT_PKT |
 658                 PCH_GBE_TM_TH_TX_STRT_8 |
 659                 PCH_GBE_TM_TH_ALM_EMP_4 | PCH_GBE_TM_TH_ALM_FULL_8;
 660
 661         iowrite32(tx_mode, &hw->reg->TX_MODE);
 662
 663         tcpip = ioread32(&hw->reg->TCPIP_ACC);
 664         tcpip |= PCH_GBE_TX_TCPIPACC_EN;
 665         iowrite32(tcpip, &hw->reg->TCPIP_ACC);
 666         return;
 667 }
 668
 669 /**
 670  * pch_gbe_configure_tx - Configure Transmit Unit after Reset
 671  * @adapter:  Board private structure
 672  */
 673 static void pch_gbe_configure_tx(struct pch_gbe_adapter *adapter)
 674 {
 675         struct pch_gbe_hw *hw = &adapter->hw;
 676         u32 tdba, tdlen, dctrl;
 677
 678         pr_debug("dma addr = 0x%08llx  size = 0x%08x\n",
 679                  (unsigned long long)adapter->tx_ring->dma,
 680                  adapter->tx_ring->size);
 681
 682         /* Setup the HW Tx Head and Tail descriptor pointers */
 683         tdba = adapter->tx_ring->dma;
 684         tdlen = adapter->tx_ring->size - 0x10;
 685         iowrite32(tdba, &hw->reg->TX_DSC_BASE);
 686         iowrite32(tdlen, &hw->reg->TX_DSC_SIZE);
 687         iowrite32(tdba, &hw->reg->TX_DSC_SW_P);
 688
 689         /* Enables Transmission DMA */
 690         dctrl = ioread32(&hw->reg->DMA_CTRL);
 691         dctrl |= PCH_GBE_TX_DMA_EN;
 692         iowrite32(dctrl, &hw->reg->DMA_CTRL);
 693 }
 694
 695 /**
 696  * pch_gbe_setup_rctl - Configure the receive control registers
 697  * @adapter:  Board private structure
 698  */
 699 static void pch_gbe_setup_rctl(struct pch_gbe_adapter *adapter)
 700 {
 701         struct net_device *netdev = adapter->netdev;
 702         struct pch_gbe_hw *hw = &adapter->hw;
 703         u32 rx_mode, tcpip;
 704
 705         rx_mode = PCH_GBE_ADD_FIL_EN | PCH_GBE_MLT_FIL_EN |
 706         PCH_GBE_RH_ALM_EMP_4 | PCH_GBE_RH_ALM_FULL_4 | PCH_GBE_RH_RD_TRG_8;
 707
 708         iowrite32(rx_mode, &hw->reg->RX_MODE);
 709
 710         tcpip = ioread32(&hw->reg->TCPIP_ACC);
 711
 712         tcpip |= PCH_GBE_RX_TCPIPACC_OFF;
 713         tcpip &= ~PCH_GBE_RX_TCPIPACC_EN;
 714         iowrite32(tcpip, &hw->reg->TCPIP_ACC);
 715         return;
 716 }
 717
 718 /**
 719  * pch_gbe_configure_rx - Configure Receive Unit after Reset
 720  * @adapter:  Board private structure
 721  */
 722 static void pch_gbe_configure_rx(struct pch_gbe_adapter *adapter)
 723 {
 724         struct pch_gbe_hw *hw = &adapter->hw;
 725         u32 rdba, rdlen, rctl, rxdma;
 726
 727         pr_debug("dma adr = 0x%08llx  size = 0x%08x\n",
 728                  (unsigned long long)adapter->rx_ring->dma,
 729                  adapter->rx_ring->size);
 730
 731         pch_gbe_mac_force_mac_fc(hw);
 732
 733         /* Disables Receive MAC */
 734         rctl = ioread32(&hw->reg->MAC_RX_EN);
 735         iowrite32((rctl & ~PCH_GBE_MRE_MAC_RX_EN), &hw->reg->MAC_RX_EN);
 736
 737         /* Disables Receive DMA */
 738         rxdma = ioread32(&hw->reg->DMA_CTRL);
 739         rxdma &= ~PCH_GBE_RX_DMA_EN;
 740         iowrite32(rxdma, &hw->reg->DMA_CTRL);
 741
 742         pr_debug("MAC_RX_EN reg = 0x%08x  DMA_CTRL reg = 0x%08x\n",
 743                  ioread32(&hw->reg->MAC_RX_EN),
 744                  ioread32(&hw->reg->DMA_CTRL));
 745
 746         /* Setup the HW Rx Head and Tail Descriptor Pointers and
 747          * the Base and Length of the Rx Descriptor Ring */
 748         rdba = adapter->rx_ring->dma;
 749         rdlen = adapter->rx_ring->size - 0x10;
 750         iowrite32(rdba, &hw->reg->RX_DSC_BASE);
 751         iowrite32(rdlen, &hw->reg->RX_DSC_SIZE);
 752         iowrite32((rdba + rdlen), &hw->reg->RX_DSC_SW_P);
 753 }
 754
 755 /**
 756  * pch_gbe_unmap_and_free_tx_resource - Unmap and free tx socket buffer
 757  * @adapter:     Board private structure
 758  * @buffer_info: Buffer information structure
 759  */
 760 static void pch_gbe_unmap_and_free_tx_resource(
 761         struct pch_gbe_adapter *adapter, struct pch_gbe_buffer *buffer_info)
 762 {
 763         if (buffer_info->mapped) {
 764                 dma_unmap_single(&adapter->pdev->dev, buffer_info->dma,
 765                                  buffer_info->length, DMA_TO_DEVICE);
 766                 buffer_info->mapped = false;
 767         }
 768         if (buffer_info->skb) {
 769                 dev_kfree_skb_any(buffer_info->skb);
 770                 buffer_info->skb = NULL;
 771         }
 772 }
 773
 774 /**
 775  * pch_gbe_unmap_and_free_rx_resource - Unmap and free rx socket buffer
 776  * @adapter:      Board private structure
 777  * @buffer_info:  Buffer information structure
 778  */
 779 static void pch_gbe_unmap_and_free_rx_resource(
 780                                         struct pch_gbe_adapter *adapter,
 781                                         struct pch_gbe_buffer *buffer_info)
 782 {
 783         if (buffer_info->mapped) {
 784                 dma_unmap_single(&adapter->pdev->dev, buffer_info->dma,
 785                                  buffer_info->length, DMA_FROM_DEVICE);
 786                 buffer_info->mapped = false;
 787         }
 788         if (buffer_info->skb) {
 789                 dev_kfree_skb_any(buffer_info->skb);
 790                 buffer_info->skb = NULL;
 791         }
 792 }
 793
 794 /**
 795  * pch_gbe_clean_tx_ring - Free Tx Buffers
 796  * @adapter:  Board private structure
 797  * @tx_ring:  Ring to be cleaned
 798  */
 799 static void pch_gbe_clean_tx_ring(struct pch_gbe_adapter *adapter,
 800                                    struct pch_gbe_tx_ring *tx_ring)
 801 {
 802         struct pch_gbe_hw *hw = &adapter->hw;
 803         struct pch_gbe_buffer *buffer_info;
 804         unsigned long size;
 805         unsigned int i;
 806
 807         /* Free all the Tx ring sk_buffs */
 808         for (i = 0; i < tx_ring->count; i++) {
 809                 buffer_info = &tx_ring->buffer_info[i];
 810                 pch_gbe_unmap_and_free_tx_resource(adapter, buffer_info);
 811         }
 812         pr_debug("call pch_gbe_unmap_and_free_tx_resource() %d count\n", i);
 813
 814         size = (unsigned long)sizeof(struct pch_gbe_buffer) * tx_ring->count;
 815         memset(tx_ring->buffer_info, 0, size);
 816
 817         /* Zero out the descriptor ring */
 818         memset(tx_ring->desc, 0, tx_ring->size);
 819         tx_ring->next_to_use = 0;
 820         tx_ring->next_to_clean = 0;
 821         iowrite32(tx_ring->dma, &hw->reg->TX_DSC_HW_P);
 822         iowrite32((tx_ring->size - 0x10), &hw->reg->TX_DSC_SIZE);
 823 }
 824
 825 /**
 826  * pch_gbe_clean_rx_ring - Free Rx Buffers
 827  * @adapter:  Board private structure
 828  * @rx_ring:  Ring to free buffers from
 829  */
 830 static void
 831 pch_gbe_clean_rx_ring(struct pch_gbe_adapter *adapter,
 832                       struct pch_gbe_rx_ring *rx_ring)
 833 {
 834         struct pch_gbe_hw *hw = &adapter->hw;
 835         struct pch_gbe_buffer *buffer_info;
 836         unsigned long size;
 837         unsigned int i;
 838
 839         /* Free all the Rx ring sk_buffs */
 840         for (i = 0; i < rx_ring->count; i++) {
 841                 buffer_info = &rx_ring->buffer_info[i];
 842                 pch_gbe_unmap_and_free_rx_resource(adapter, buffer_info);
 843         }
 844         pr_debug("call pch_gbe_unmap_and_free_rx_resource() %d count\n", i);
 845         size = (unsigned long)sizeof(struct pch_gbe_buffer) * rx_ring->count;
 846         memset(rx_ring->buffer_info, 0, size);
 847
 848         /* Zero out the descriptor ring */
 849         memset(rx_ring->desc, 0, rx_ring->size);
 850         rx_ring->next_to_clean = 0;
 851         rx_ring->next_to_use = 0;
 852         iowrite32(rx_ring->dma, &hw->reg->RX_DSC_HW_P);
 853         iowrite32((rx_ring->size - 0x10), &hw->reg->RX_DSC_SIZE);
 854 }
 855
 856 static void pch_gbe_set_rgmii_ctrl(struct pch_gbe_adapter *adapter, u16 speed,
 857                                     u16 duplex)
 858 {
 859         struct pch_gbe_hw *hw = &adapter->hw;
 860         unsigned long rgmii = 0;
 861
 862         /* Set the RGMII control. */
 863 #ifdef PCH_GBE_MAC_IFOP_RGMII
 864         switch (speed) {
 865         case SPEED_10:
 866                 rgmii = (PCH_GBE_RGMII_RATE_2_5M |
 867                          PCH_GBE_MAC_RGMII_CTRL_SETTING);
 868                 break;
 869         case SPEED_100:
 870                 rgmii = (PCH_GBE_RGMII_RATE_25M |
 871                          PCH_GBE_MAC_RGMII_CTRL_SETTING);
 872                 break;
 873         case SPEED_1000:
 874                 rgmii = (PCH_GBE_RGMII_RATE_125M |
 875                          PCH_GBE_MAC_RGMII_CTRL_SETTING);
 876                 break;
 877         }
 878         iowrite32(rgmii, &hw->reg->RGMII_CTRL);
 879 #else   /* GMII */
 880         rgmii = 0;
 881         iowrite32(rgmii, &hw->reg->RGMII_CTRL);
 882 #endif
 883 }
 884 static void pch_gbe_set_mode(struct pch_gbe_adapter *adapter, u16 speed,
 885                               u16 duplex)
 886 {
 887         struct net_device *netdev = adapter->netdev;
 888         struct pch_gbe_hw *hw = &adapter->hw;
 889         unsigned long mode = 0;
 890
 891         /* Set the communication mode */
 892         switch (speed) {
 893         case SPEED_10:
 894                 mode = PCH_GBE_MODE_MII_ETHER;
 895                 netdev->tx_queue_len = 10;
 896                 break;
 897         case SPEED_100:
 898                 mode = PCH_GBE_MODE_MII_ETHER;
 899                 netdev->tx_queue_len = 100;
 900                 break;
 901         case SPEED_1000:
 902                 mode = PCH_GBE_MODE_GMII_ETHER;
 903                 break;
 904         }
 905         if (duplex == DUPLEX_FULL)
 906                 mode |= PCH_GBE_MODE_FULL_DUPLEX;
 907         else
 908                 mode |= PCH_GBE_MODE_HALF_DUPLEX;
 909         iowrite32(mode, &hw->reg->MODE);
 910 }
 911
 912 /**
 913  * pch_gbe_watchdog - Watchdog process
 914  * @data:  Board private structure
 915  */
 916 static void pch_gbe_watchdog(unsigned long data)
 917 {
 918         struct pch_gbe_adapter *adapter = (struct pch_gbe_adapter *)data;
 919         struct net_device *netdev = adapter->netdev;
 920         struct pch_gbe_hw *hw = &adapter->hw;
 921
 922         pr_debug("right now = %ld\n", jiffies);
 923
 924         pch_gbe_update_stats(adapter);
 925         if ((mii_link_ok(&adapter->mii)) && (!netif_carrier_ok(netdev))) {
 926                 struct ethtool_cmd cmd = { .cmd = ETHTOOL_GSET };
 927                 netdev->tx_queue_len = adapter->tx_queue_len;
 928                 /* mii library handles link maintenance tasks */
 929                 if (mii_ethtool_gset(&adapter->mii, &cmd)) {
 930                         pr_err("ethtool get setting Error\n");
 931                         mod_timer(&adapter->watchdog_timer,
 932                                   round_jiffies(jiffies +
 933                                                 PCH_GBE_WATCHDOG_PERIOD));
 934                         return;
 935                 }
 936                 hw->mac.link_speed = ethtool_cmd_speed(&cmd);
 937                 hw->mac.link_duplex = cmd.duplex;
 938                 /* Set the RGMII control. */
 939                 pch_gbe_set_rgmii_ctrl(adapter, hw->mac.link_speed,
 940                                                 hw->mac.link_duplex);
 941                 /* Set the communication mode */
 942                 pch_gbe_set_mode(adapter, hw->mac.link_speed,
 943                                  hw->mac.link_duplex);
 944                 netdev_dbg(netdev,
 945                            "Link is Up %d Mbps %s-Duplex\n",
 946                            hw->mac.link_speed,
 947                            cmd.duplex == DUPLEX_FULL ? "Full" : "Half");
 948                 netif_carrier_on(netdev);
 949                 netif_wake_queue(netdev);
 950         } else if ((!mii_link_ok(&adapter->mii)) &&
 951                    (netif_carrier_ok(netdev))) {
 952                 netdev_dbg(netdev, "NIC Link is Down\n");
 953                 hw->mac.link_speed = SPEED_10;
 954                 hw->mac.link_duplex = DUPLEX_HALF;
 955                 netif_carrier_off(netdev);
 956                 netif_stop_queue(netdev);
 957         }
 958         mod_timer(&adapter->watchdog_timer,
 959                   round_jiffies(jiffies + PCH_GBE_WATCHDOG_PERIOD));
 960 }
 961
 962 /**
 963  * pch_gbe_tx_queue - Carry out queuing of the transmission data
 964  * @adapter:  Board private structure
 965  * @tx_ring:  Tx descriptor ring structure
 966  * @skb:      Sockt buffer structure
 967  */
 968 static void pch_gbe_tx_queue(struct pch_gbe_adapter *adapter,
 969                               struct pch_gbe_tx_ring *tx_ring,
 970                               struct sk_buff *skb)
 971 {
 972         struct pch_gbe_hw *hw = &adapter->hw;
 973         struct pch_gbe_tx_desc *tx_desc;
 974         struct pch_gbe_buffer *buffer_info;
 975         struct sk_buff *tmp_skb;
 976         unsigned int frame_ctrl;
 977         unsigned int ring_num;
 978         unsigned long flags;
 979
 980         /*-- Set frame control --*/
 981         frame_ctrl = 0;
 982         if (unlikely(skb->len < PCH_GBE_SHORT_PKT))
 983                 frame_ctrl |= PCH_GBE_TXD_CTRL_APAD;
 984         if (skb->ip_summed == CHECKSUM_NONE)
 985                 frame_ctrl |= PCH_GBE_TXD_CTRL_TCPIP_ACC_OFF;
 986
 987         /* Performs checksum processing */
 988         /*
 989          * It is because the hardware accelerator does not support a checksum,
 990          * when the received data size is less than 64 bytes.
 991          */
 992         if (skb->len < PCH_GBE_SHORT_PKT && skb->ip_summed != CHECKSUM_NONE) {
 993                 frame_ctrl |= PCH_GBE_TXD_CTRL_APAD |
 994                               PCH_GBE_TXD_CTRL_TCPIP_ACC_OFF;
 995                 if (skb->protocol == htons(ETH_P_IP)) {
 996                         struct iphdr *iph = ip_hdr(skb);
 997                         unsigned int offset;
 998                         iph->check = 0;
 999                         iph->check = ip_fast_csum((u8 *) iph, iph->ihl);
1000                         offset = skb_transport_offset(skb);
1001                         if (iph->protocol == IPPROTO_TCP) {
1002                                 skb->csum = 0;
1003                                 tcp_hdr(skb)->check = 0;
1004                                 skb->csum = skb_checksum(skb, offset,
1005                                                          skb->len - offset, 0);
1006                                 tcp_hdr(skb)->check =
1007                                         csum_tcpudp_magic(iph->saddr,
1008                                                           iph->daddr,
1009                                                           skb->len - offset,
1010                                                           IPPROTO_TCP,
1011                                                           skb->csum);
1012                         } else if (iph->protocol == IPPROTO_UDP) {
1013                                 skb->csum = 0;
1014                                 udp_hdr(skb)->check = 0;
1015                                 skb->csum =
1016                                         skb_checksum(skb, offset,
1017                                                      skb->len - offset, 0);
1018                                 udp_hdr(skb)->check =
1019                                         csum_tcpudp_magic(iph->saddr,
1020                                                           iph->daddr,
1021                                                           skb->len - offset,
1022                                                           IPPROTO_UDP,
1023                                                           skb->csum);
1024                         }
1025                 }
1026         }
1027         spin_lock_irqsave(&tx_ring->tx_lock, flags);
1028         ring_num = tx_ring->next_to_use;
1029         if (unlikely((ring_num + 1) == tx_ring->count))
1030                 tx_ring->next_to_use = 0;
1031         else
1032                 tx_ring->next_to_use = ring_num + 1;
1033
1034         spin_unlock_irqrestore(&tx_ring->tx_lock, flags);
1035         buffer_info = &tx_ring->buffer_info[ring_num];
1036         tmp_skb = buffer_info->skb;
1037
1038         /* [Header:14][payload] ---> [Header:14][paddong:2][payload]    */
1039         memcpy(tmp_skb->data, skb->data, ETH_HLEN);
1040         tmp_skb->data[ETH_HLEN] = 0x00;
1041         tmp_skb->data[ETH_HLEN + 1] = 0x00;
1042         tmp_skb->len = skb->len;
1043         memcpy(&tmp_skb->data[ETH_HLEN + 2], &skb->data[ETH_HLEN],
1044                (skb->len - ETH_HLEN));
1045         /*-- Set Buffer information --*/
1046         buffer_info->length = tmp_skb->len;
1047         buffer_info->dma = dma_map_single(&adapter->pdev->dev, tmp_skb->data,
1048                                           buffer_info->length,
1049                                           DMA_TO_DEVICE);
1050         if (dma_mapping_error(&adapter->pdev->dev, buffer_info->dma)) {
1051                 pr_err("TX DMA map failed\n");
1052                 buffer_info->dma = 0;
1053                 buffer_info->time_stamp = 0;
1054                 tx_ring->next_to_use = ring_num;
1055                 return;
1056         }
1057         buffer_info->mapped = true;
1058         buffer_info->time_stamp = jiffies;
1059
1060         /*-- Set Tx descriptor --*/
1061         tx_desc = PCH_GBE_TX_DESC(*tx_ring, ring_num);
1062         tx_desc->buffer_addr = (buffer_info->dma);
1063         tx_desc->length = (tmp_skb->len);
1064         tx_desc->tx_words_eob = ((tmp_skb->len + 3));
1065         tx_desc->tx_frame_ctrl = (frame_ctrl);
1066         tx_desc->gbec_status = (DSC_INIT16);
1067
1068         if (unlikely(++ring_num == tx_ring->count))
1069                 ring_num = 0;
1070
1071         /* Update software pointer of TX descriptor */
1072         iowrite32(tx_ring->dma +
1073                   (int)sizeof(struct pch_gbe_tx_desc) * ring_num,
1074                   &hw->reg->TX_DSC_SW_P);
1075         dev_kfree_skb_any(skb);
1076 }
1077
1078 /**
1079  * pch_gbe_update_stats - Update the board statistics counters
1080  * @adapter:  Board private structure
1081  */
1082 void pch_gbe_update_stats(struct pch_gbe_adapter *adapter)
1083 {
1084         struct net_device *netdev = adapter->netdev;
1085         struct pci_dev *pdev = adapter->pdev;
1086         struct pch_gbe_hw_stats *stats = &adapter->stats;
1087         unsigned long flags;
1088
1089         /*
1090          * Prevent stats update while adapter is being reset, or if the pci
1091          * connection is down.
1092          */
1093         if ((pdev->error_state) && (pdev->error_state != pci_channel_io_normal))
1094                 return;
1095
1096         spin_lock_irqsave(&adapter->stats_lock, flags);
1097
1098         /* Update device status "adapter->stats" */
1099         stats->rx_errors = stats->rx_crc_errors + stats->rx_frame_errors;
1100         stats->tx_errors = stats->tx_length_errors +
1101             stats->tx_aborted_errors +
1102             stats->tx_carrier_errors + stats->tx_timeout_count;
1103
1104         /* Update network device status "adapter->net_stats" */
1105         netdev->stats.rx_packets = stats->rx_packets;
1106         netdev->stats.rx_bytes = stats->rx_bytes;
1107         netdev->stats.rx_dropped = stats->rx_dropped;
1108         netdev->stats.tx_packets = stats->tx_packets;
1109         netdev->stats.tx_bytes = stats->tx_bytes;
1110         netdev->stats.tx_dropped = stats->tx_dropped;
1111         /* Fill out the OS statistics structure */
1112         netdev->stats.multicast = stats->multicast;
1113         netdev->stats.collisions = stats->collisions;
1114         /* Rx Errors */
1115         netdev->stats.rx_errors = stats->rx_errors;
1116         netdev->stats.rx_crc_errors = stats->rx_crc_errors;
1117         netdev->stats.rx_frame_errors = stats->rx_frame_errors;
1118         /* Tx Errors */
1119         netdev->stats.tx_errors = stats->tx_errors;
1120         netdev->stats.tx_aborted_errors = stats->tx_aborted_errors;
1121         netdev->stats.tx_carrier_errors = stats->tx_carrier_errors;
1122
1123         spin_unlock_irqrestore(&adapter->stats_lock, flags);
1124 }
1125
1126 static void pch_gbe_stop_receive(struct pch_gbe_adapter *adapter)
1127 {
1128         struct pch_gbe_hw *hw = &adapter->hw;
1129         u32 rxdma;
1130         u16 value;
1131         int ret;
1132
1133         /* Disable Receive DMA */
1134         rxdma = ioread32(&hw->reg->DMA_CTRL);
1135         rxdma &= ~PCH_GBE_RX_DMA_EN;
1136         iowrite32(rxdma, &hw->reg->DMA_CTRL);
1137         /* Wait Rx DMA BUS is IDLE */
1138         ret = pch_gbe_wait_clr_bit_irq(&hw->reg->RX_DMA_ST, PCH_GBE_IDLE_CHECK);
1139         if (ret) {
1140                 /* Disable Bus master */
1141                 pci_read_config_word(adapter->pdev, PCI_COMMAND, &value);
1142                 value &= ~PCI_COMMAND_MASTER;
1143                 pci_write_config_word(adapter->pdev, PCI_COMMAND, value);
1144                 /* Stop Receive */
1145                 pch_gbe_mac_reset_rx(hw);
1146                 /* Enable Bus master */
1147                 value |= PCI_COMMAND_MASTER;
1148                 pci_write_config_word(adapter->pdev, PCI_COMMAND, value);
1149         } else {
1150                 /* Stop Receive */
1151                 pch_gbe_mac_reset_rx(hw);
1152         }
1153 }
1154
1155 static void pch_gbe_start_receive(struct pch_gbe_hw *hw)
1156 {
1157         u32 rxdma;
1158
1159         /* Enables Receive DMA */
1160         rxdma = ioread32(&hw->reg->DMA_CTRL);
1161         rxdma |= PCH_GBE_RX_DMA_EN;
1162         iowrite32(rxdma, &hw->reg->DMA_CTRL);
1163         /* Enables Receive */
1164         iowrite32(PCH_GBE_MRE_MAC_RX_EN, &hw->reg->MAC_RX_EN);
1165         return;
1166 }
1167
1168 /**
1169  * pch_gbe_intr - Interrupt Handler
1170  * @irq:   Interrupt number
1171  * @data:  Pointer to a network interface device structure
1172  * Returns
1173  *      - IRQ_HANDLED:  Our interrupt
1174  *      - IRQ_NONE:     Not our interrupt
1175  */
1176 static irqreturn_t pch_gbe_intr(int irq, void *data)
1177 {
1178         struct net_device *netdev = data;
1179         struct pch_gbe_adapter *adapter = netdev_priv(netdev);
1180         struct pch_gbe_hw *hw = &adapter->hw;
1181         u32 int_st;
1182         u32 int_en;
1183
1184         /* Check request status */
1185         int_st = ioread32(&hw->reg->INT_ST);
1186         int_st = int_st & ioread32(&hw->reg->INT_EN);
1187         /* When request status is no interruption factor */
1188         if (unlikely(!int_st))
1189                 return IRQ_NONE;        /* Not our interrupt. End processing. */
1190         pr_debug("%s occur int_st = 0x%08x\n", __func__, int_st);
1191         if (int_st & PCH_GBE_INT_RX_FRAME_ERR)
1192                 adapter->stats.intr_rx_frame_err_count++;
1193         if (int_st & PCH_GBE_INT_RX_FIFO_ERR)
1194                 if (!adapter->rx_stop_flag) {
1195                         adapter->stats.intr_rx_fifo_err_count++;
1196                         pr_debug("Rx fifo over run\n");
1197                         adapter->rx_stop_flag = true;
1198                         int_en = ioread32(&hw->reg->INT_EN);
1199                         iowrite32((int_en & ~PCH_GBE_INT_RX_FIFO_ERR),
1200                                   &hw->reg->INT_EN);
1201                         pch_gbe_stop_receive(adapter);
1202                         int_st |= ioread32(&hw->reg->INT_ST);
1203                         int_st = int_st & ioread32(&hw->reg->INT_EN);
1204                 }
1205         if (int_st & PCH_GBE_INT_RX_DMA_ERR)
1206                 adapter->stats.intr_rx_dma_err_count++;
1207         if (int_st & PCH_GBE_INT_TX_FIFO_ERR)
1208                 adapter->stats.intr_tx_fifo_err_count++;
1209         if (int_st & PCH_GBE_INT_TX_DMA_ERR)
1210                 adapter->stats.intr_tx_dma_err_count++;
1211         if (int_st & PCH_GBE_INT_TCPIP_ERR)
1212                 adapter->stats.intr_tcpip_err_count++;
1213         /* When Rx descriptor is empty  */
1214         if ((int_st & PCH_GBE_INT_RX_DSC_EMP)) {
1215                 adapter->stats.intr_rx_dsc_empty_count++;
1216                 pr_debug("Rx descriptor is empty\n");
1217                 int_en = ioread32(&hw->reg->INT_EN);
1218                 iowrite32((int_en & ~PCH_GBE_INT_RX_DSC_EMP), &hw->reg->INT_EN);
1219                 if (hw->mac.tx_fc_enable) {
1220                         /* Set Pause packet */
1221                         pch_gbe_mac_set_pause_packet(hw);
1222                 }
1223         }
1224
1225         /* When request status is Receive interruption */
1226         if ((int_st & (PCH_GBE_INT_RX_DMA_CMPLT | PCH_GBE_INT_TX_CMPLT)) ||
1227             (adapter->rx_stop_flag == true)) {
1228                 if (likely(napi_schedule_prep(&adapter->napi))) {
1229                         /* Enable only Rx Descriptor empty */
1230                         atomic_inc(&adapter->irq_sem);
1231                         int_en = ioread32(&hw->reg->INT_EN);
1232                         int_en &=
1233                             ~(PCH_GBE_INT_RX_DMA_CMPLT | PCH_GBE_INT_TX_CMPLT);
1234                         iowrite32(int_en, &hw->reg->INT_EN);
1235                         /* Start polling for NAPI */
1236                         __napi_schedule(&adapter->napi);
1237                 }
1238         }
1239         pr_debug("return = 0x%08x  INT_EN reg = 0x%08x\n",
1240                  IRQ_HANDLED, ioread32(&hw->reg->INT_EN));
1241         return IRQ_HANDLED;
1242 }
1243
1244 /**
1245  * pch_gbe_alloc_rx_buffers - Replace used receive buffers; legacy & extended
1246  * @adapter:       Board private structure
1247  * @rx_ring:       Rx descriptor ring
1248  * @cleaned_count: Cleaned count
1249  */
1250 static void
1251 pch_gbe_alloc_rx_buffers(struct pch_gbe_adapter *adapter,
1252                          struct pch_gbe_rx_ring *rx_ring, int cleaned_count)
1253 {
1254         struct net_device *netdev = adapter->netdev;
1255         struct pci_dev *pdev = adapter->pdev;
1256         struct pch_gbe_hw *hw = &adapter->hw;
1257         struct pch_gbe_rx_desc *rx_desc;
1258         struct pch_gbe_buffer *buffer_info;
1259         struct sk_buff *skb;
1260         unsigned int i;
1261         unsigned int bufsz;
1262
1263         bufsz = adapter->rx_buffer_len + NET_IP_ALIGN;
1264         i = rx_ring->next_to_use;
1265
1266         while ((cleaned_count--)) {
1267                 buffer_info = &rx_ring->buffer_info[i];
1268                 skb = netdev_alloc_skb(netdev, bufsz);
1269                 if (unlikely(!skb)) {
1270                         /* Better luck next round */
1271                         adapter->stats.rx_alloc_buff_failed++;
1272                         break;
1273                 }
1274                 /* align */
1275                 skb_reserve(skb, NET_IP_ALIGN);
1276                 buffer_info->skb = skb;
1277
1278                 buffer_info->dma = dma_map_single(&pdev->dev,
1279                                                   buffer_info->rx_buffer,
1280                                                   buffer_info->length,
1281                                                   DMA_FROM_DEVICE);
1282                 if (dma_mapping_error(&adapter->pdev->dev, buffer_info->dma)) {
1283                         dev_kfree_skb(skb);
1284                         buffer_info->skb = NULL;
1285                         buffer_info->dma = 0;
1286                         adapter->stats.rx_alloc_buff_failed++;
1287                         break; /* while !buffer_info->skb */
1288                 }
1289                 buffer_info->mapped = true;
1290                 rx_desc = PCH_GBE_RX_DESC(*rx_ring, i);
1291                 rx_desc->buffer_addr = (buffer_info->dma);
1292                 rx_desc->gbec_status = DSC_INIT16;
1293
1294                 pr_debug("i = %d  buffer_info->dma = 0x08%llx  buffer_info->length = 0x%x\n",
1295                          i, (unsigned long long)buffer_info->dma,
1296                          buffer_info->length);
1297
1298                 if (unlikely(++i == rx_ring->count))
1299                         i = 0;
1300         }
1301         if (likely(rx_ring->next_to_use != i)) {
1302                 rx_ring->next_to_use = i;
1303                 if (unlikely(i-- == 0))
1304                         i = (rx_ring->count - 1);
1305                 iowrite32(rx_ring->dma +
1306                           (int)sizeof(struct pch_gbe_rx_desc) * i,
1307                           &hw->reg->RX_DSC_SW_P);
1308         }
1309         return;
1310 }
1311
1312 static int
1313 pch_gbe_alloc_rx_buffers_pool(struct pch_gbe_adapter *adapter,
1314                          struct pch_gbe_rx_ring *rx_ring, int cleaned_count)
1315 {
1316         struct pci_dev *pdev = adapter->pdev;
1317         struct pch_gbe_buffer *buffer_info;
1318         unsigned int i;
1319         unsigned int bufsz;
1320         unsigned int size;
1321
1322         bufsz = adapter->rx_buffer_len;
1323
1324         size = rx_ring->count * bufsz + PCH_GBE_RESERVE_MEMORY;
1325         rx_ring->rx_buff_pool = dma_alloc_coherent(&pdev->dev, size,
1326                                                 &rx_ring->rx_buff_pool_logic,
1327                                                 GFP_KERNEL);
1328         if (!rx_ring->rx_buff_pool) {
1329                 pr_err("Unable to allocate memory for the receive poll buffer\n");
1330                 return -ENOMEM;
1331         }
1332         memset(rx_ring->rx_buff_pool, 0, size);
1333         rx_ring->rx_buff_pool_size = size;
1334         for (i = 0; i < rx_ring->count; i++) {
1335                 buffer_info = &rx_ring->buffer_info[i];
1336                 buffer_info->rx_buffer = rx_ring->rx_buff_pool + bufsz * i;
1337                 buffer_info->length = bufsz;
1338         }
1339         return 0;
1340 }
1341
1342 /**
1343  * pch_gbe_alloc_tx_buffers - Allocate transmit buffers
1344  * @adapter:   Board private structure
1345  * @tx_ring:   Tx descriptor ring
1346  */
1347 static void pch_gbe_alloc_tx_buffers(struct pch_gbe_adapter *adapter,
1348                                         struct pch_gbe_tx_ring *tx_ring)
1349 {
1350         struct pch_gbe_buffer *buffer_info;
1351         struct sk_buff *skb;
1352         unsigned int i;
1353         unsigned int bufsz;
1354         struct pch_gbe_tx_desc *tx_desc;
1355
1356         bufsz =
1357             adapter->hw.mac.max_frame_size + PCH_GBE_DMA_ALIGN + NET_IP_ALIGN;
1358
1359         for (i = 0; i < tx_ring->count; i++) {
1360                 buffer_info = &tx_ring->buffer_info[i];
1361                 skb = netdev_alloc_skb(adapter->netdev, bufsz);
1362                 skb_reserve(skb, PCH_GBE_DMA_ALIGN);
1363                 buffer_info->skb = skb;
1364                 tx_desc = PCH_GBE_TX_DESC(*tx_ring, i);
1365                 tx_desc->gbec_status = (DSC_INIT16);
1366         }
1367         return;
1368 }
1369
1370 /**
1371  * pch_gbe_clean_tx - Reclaim resources after transmit completes
1372  * @adapter:   Board private structure
1373  * @tx_ring:   Tx descriptor ring
1374  * Returns
1375  *      true:  Cleaned the descriptor
1376  *      false: Not cleaned the descriptor
1377  */
1378 static bool
1379 pch_gbe_clean_tx(struct pch_gbe_adapter *adapter,
1380                  struct pch_gbe_tx_ring *tx_ring)
1381 {
1382         struct pch_gbe_tx_desc *tx_desc;
1383         struct pch_gbe_buffer *buffer_info;
1384         struct sk_buff *skb;
1385         unsigned int i;
1386         unsigned int cleaned_count = 0;
1387         bool cleaned = true;
1388
1389         pr_debug("next_to_clean : %d\n", tx_ring->next_to_clean);
1390
1391         i = tx_ring->next_to_clean;
1392         tx_desc = PCH_GBE_TX_DESC(*tx_ring, i);
1393         pr_debug("gbec_status:0x%04x  dma_status:0x%04x\n",
1394                  tx_desc->gbec_status, tx_desc->dma_status);
1395
1396         while ((tx_desc->gbec_status & DSC_INIT16) == 0x0000) {
1397                 pr_debug("gbec_status:0x%04x\n", tx_desc->gbec_status);
1398                 buffer_info = &tx_ring->buffer_info[i];
1399                 skb = buffer_info->skb;
1400
1401                 if ((tx_desc->gbec_status & PCH_GBE_TXD_GMAC_STAT_ABT)) {
1402                         adapter->stats.tx_aborted_errors++;
1403                         pr_err("Transfer Abort Error\n");
1404                 } else if ((tx_desc->gbec_status & PCH_GBE_TXD_GMAC_STAT_CRSER)
1405                           ) {
1406                         adapter->stats.tx_carrier_errors++;
1407                         pr_err("Transfer Carrier Sense Error\n");
1408                 } else if ((tx_desc->gbec_status & PCH_GBE_TXD_GMAC_STAT_EXCOL)
1409                           ) {
1410                         adapter->stats.tx_aborted_errors++;
1411                         pr_err("Transfer Collision Abort Error\n");
1412                 } else if ((tx_desc->gbec_status &
1413                             (PCH_GBE_TXD_GMAC_STAT_SNGCOL |
1414                              PCH_GBE_TXD_GMAC_STAT_MLTCOL))) {
1415                         adapter->stats.collisions++;
1416                         adapter->stats.tx_packets++;
1417                         adapter->stats.tx_bytes += skb->len;
1418                         pr_debug("Transfer Collision\n");
1419                 } else if ((tx_desc->gbec_status & PCH_GBE_TXD_GMAC_STAT_CMPLT)
1420                           ) {
1421                         adapter->stats.tx_packets++;
1422                         adapter->stats.tx_bytes += skb->len;
1423                 }
1424                 if (buffer_info->mapped) {
1425                         pr_debug("unmap buffer_info->dma : %d\n", i);
1426                         dma_unmap_single(&adapter->pdev->dev, buffer_info->dma,
1427                                          buffer_info->length, DMA_TO_DEVICE);
1428                         buffer_info->mapped = false;
1429                 }
1430                 if (buffer_info->skb) {
1431                         pr_debug("trim buffer_info->skb : %d\n", i);
1432                         skb_trim(buffer_info->skb, 0);
1433                 }
1434                 tx_desc->gbec_status = DSC_INIT16;
1435                 if (unlikely(++i == tx_ring->count))
1436                         i = 0;
1437                 tx_desc = PCH_GBE_TX_DESC(*tx_ring, i);
1438
1439                 /* weight of a sort for tx, to avoid endless transmit cleanup */
1440                 if (cleaned_count++ == PCH_GBE_TX_WEIGHT) {
1441                         cleaned = false;
1442                         break;
1443                 }
1444         }
1445         pr_debug("called pch_gbe_unmap_and_free_tx_resource() %d count\n",
1446                  cleaned_count);
1447         /* Recover from running out of Tx resources in xmit_frame */
1448         if (unlikely(cleaned && (netif_queue_stopped(adapter->netdev)))) {
1449                 netif_wake_queue(adapter->netdev);
1450                 adapter->stats.tx_restart_count++;
1451                 pr_debug("Tx wake queue\n");
1452         }
1453         spin_lock(&adapter->tx_queue_lock);
1454         tx_ring->next_to_clean = i;
1455         spin_unlock(&adapter->tx_queue_lock);
1456         pr_debug("next_to_clean : %d\n", tx_ring->next_to_clean);
1457         return cleaned;
1458 }
1459
1460 /**
1461  * pch_gbe_clean_rx - Send received data up the network stack; legacy
1462  * @adapter:     Board private structure
1463  * @rx_ring:     Rx descriptor ring
1464  * @work_done:   Completed count
1465  * @work_to_do:  Request count
1466  * Returns
1467  *      true:  Cleaned the descriptor
1468  *      false: Not cleaned the descriptor
1469  */
1470 static bool
1471 pch_gbe_clean_rx(struct pch_gbe_adapter *adapter,
1472                  struct pch_gbe_rx_ring *rx_ring,
1473                  int *work_done, int work_to_do)
1474 {
1475         struct net_device *netdev = adapter->netdev;
1476         struct pci_dev *pdev = adapter->pdev;
1477         struct pch_gbe_buffer *buffer_info;
1478         struct pch_gbe_rx_desc *rx_desc;
1479         u32 length;
1480         unsigned int i;
1481         unsigned int cleaned_count = 0;
1482         bool cleaned = false;
1483         struct sk_buff *skb;
1484         u8 dma_status;
1485         u16 gbec_status;
1486         u32 tcp_ip_status;
1487
1488         i = rx_ring->next_to_clean;
1489
1490         while (*work_done < work_to_do) {
1491                 /* Check Rx descriptor status */
1492                 rx_desc = PCH_GBE_RX_DESC(*rx_ring, i);
1493                 if (rx_desc->gbec_status == DSC_INIT16)
1494                         break;
1495                 cleaned = true;
1496                 cleaned_count++;
1497
1498                 dma_status = rx_desc->dma_status;
1499                 gbec_status = rx_desc->gbec_status;
1500                 tcp_ip_status = rx_desc->tcp_ip_status;
1501                 rx_desc->gbec_status = DSC_INIT16;
1502                 buffer_info = &rx_ring->buffer_info[i];
1503                 skb = buffer_info->skb;
1504                 buffer_info->skb = NULL;
1505
1506                 /* unmap dma */
1507                 dma_unmap_single(&pdev->dev, buffer_info->dma,
1508                                    buffer_info->length, DMA_FROM_DEVICE);
1509                 buffer_info->mapped = false;
1510
1511                 pr_debug("RxDecNo = 0x%04x  Status[DMA:0x%02x GBE:0x%04x "
1512                          "TCP:0x%08x]  BufInf = 0x%p\n",
1513                          i, dma_status, gbec_status, tcp_ip_status,
1514                          buffer_info);
1515                 /* Error check */
1516                 if (unlikely(gbec_status & PCH_GBE_RXD_GMAC_STAT_NOTOCTAL)) {
1517                         adapter->stats.rx_frame_errors++;
1518                         pr_err("Receive Not Octal Error\n");
1519                 } else if (unlikely(gbec_status &
1520                                 PCH_GBE_RXD_GMAC_STAT_NBLERR)) {
1521                         adapter->stats.rx_frame_errors++;
1522                         pr_err("Receive Nibble Error\n");
1523                 } else if (unlikely(gbec_status &
1524                                 PCH_GBE_RXD_GMAC_STAT_CRCERR)) {
1525                         adapter->stats.rx_crc_errors++;
1526                         pr_err("Receive CRC Error\n");
1527                 } else {
1528                         /* get receive length */
1529                         /* length convert[-3], length includes FCS length */
1530                         length = (rx_desc->rx_words_eob) - 3 - ETH_FCS_LEN;
1531                         if (rx_desc->rx_words_eob & 0x02)
1532                                 length = length - 4;
1533                         /*
1534                          * buffer_info->rx_buffer: [Header:14][payload]
1535                          * skb->data: [Reserve:2][Header:14][payload]
1536                          */
1537                         memcpy(skb->data, buffer_info->rx_buffer, length);
1538
1539                         /* update status of driver */
1540                         adapter->stats.rx_bytes += length;
1541                         adapter->stats.rx_packets++;
1542                         if ((gbec_status & PCH_GBE_RXD_GMAC_STAT_MARMLT))
1543                                 adapter->stats.multicast++;
1544                         /* Write meta date of skb */
1545                         skb_put(skb, length);
1546                         skb->protocol = eth_type_trans(skb, netdev);
1547                         if (tcp_ip_status & PCH_GBE_RXD_ACC_STAT_TCPIPOK)
1548                                 skb->ip_summed = CHECKSUM_NONE;
1549                         else
1550                                 skb->ip_summed = CHECKSUM_UNNECESSARY;
1551
1552                         napi_gro_receive(&adapter->napi, skb);
1553                         (*work_done)++;
1554                         pr_debug("Receive skb->ip_summed: %d length: %d\n",
1555                                  skb->ip_summed, length);
1556                 }
1557                 /* return some buffers to hardware, one at a time is too slow */
1558                 if (unlikely(cleaned_count >= PCH_GBE_RX_BUFFER_WRITE)) {
1559                         pch_gbe_alloc_rx_buffers(adapter, rx_ring,
1560                                                  cleaned_count);
1561                         cleaned_count = 0;
1562                 }
1563                 if (++i == rx_ring->count)
1564                         i = 0;
1565         }
1566         rx_ring->next_to_clean = i;
1567         if (cleaned_count)
1568                 pch_gbe_alloc_rx_buffers(adapter, rx_ring, cleaned_count);
1569         return cleaned;
1570 }
1571
1572 /**
1573  * pch_gbe_setup_tx_resources - Allocate Tx resources (Descriptors)
1574  * @adapter:  Board private structure
1575  * @tx_ring:  Tx descriptor ring (for a specific queue) to setup
1576  * Returns
1577  *      0:              Successfully
1578  *      Negative value: Failed
1579  */
1580 int pch_gbe_setup_tx_resources(struct pch_gbe_adapter *adapter,
1581                                 struct pch_gbe_tx_ring *tx_ring)
1582 {
1583         struct pci_dev *pdev = adapter->pdev;
1584         struct pch_gbe_tx_desc *tx_desc;
1585         int size;
1586         int desNo;
1587
1588         size = (int)sizeof(struct pch_gbe_buffer) * tx_ring->count;
1589         tx_ring->buffer_info = vzalloc(size);
1590         if (!tx_ring->buffer_info) {
1591                 pr_err("Unable to allocate memory for the buffer information\n");
1592                 return -ENOMEM;
1593         }
1594
1595         tx_ring->size = tx_ring->count * (int)sizeof(struct pch_gbe_tx_desc);
1596
1597         tx_ring->desc = dma_alloc_coherent(&pdev->dev, tx_ring->size,
1598                                            &tx_ring->dma, GFP_KERNEL);
1599         if (!tx_ring->desc) {
1600                 vfree(tx_ring->buffer_info);
1601                 pr_err("Unable to allocate memory for the transmit descriptor ring\n");
1602                 return -ENOMEM;
1603         }
1604         memset(tx_ring->desc, 0, tx_ring->size);
1605
1606         tx_ring->next_to_use = 0;
1607         tx_ring->next_to_clean = 0;
1608         spin_lock_init(&tx_ring->tx_lock);
1609
1610         for (desNo = 0; desNo < tx_ring->count; desNo++) {
1611                 tx_desc = PCH_GBE_TX_DESC(*tx_ring, desNo);
1612                 tx_desc->gbec_status = DSC_INIT16;
1613         }
1614         pr_debug("tx_ring->desc = 0x%p  tx_ring->dma = 0x%08llx\n"
1615                  "next_to_clean = 0x%08x  next_to_use = 0x%08x\n",
1616                  tx_ring->desc, (unsigned long long)tx_ring->dma,
1617                  tx_ring->next_to_clean, tx_ring->next_to_use);
1618         return 0;
1619 }
1620
1621 /**
1622  * pch_gbe_setup_rx_resources - Allocate Rx resources (Descriptors)
1623  * @adapter:  Board private structure
1624  * @rx_ring:  Rx descriptor ring (for a specific queue) to setup
1625  * Returns
1626  *      0:              Successfully
1627  *      Negative value: Failed
1628  */
1629 int pch_gbe_setup_rx_resources(struct pch_gbe_adapter *adapter,
1630                                 struct pch_gbe_rx_ring *rx_ring)
1631 {
1632         struct pci_dev *pdev = adapter->pdev;
1633         struct pch_gbe_rx_desc *rx_desc;
1634         int size;
1635         int desNo;
1636
1637         size = (int)sizeof(struct pch_gbe_buffer) * rx_ring->count;
1638         rx_ring->buffer_info = vzalloc(size);
1639         if (!rx_ring->buffer_info) {
1640                 pr_err("Unable to allocate memory for the receive descriptor ring\n");
1641                 return -ENOMEM;
1642         }
1643         rx_ring->size = rx_ring->count * (int)sizeof(struct pch_gbe_rx_desc);
1644         rx_ring->desc = dma_alloc_coherent(&pdev->dev, rx_ring->size,
1645                                            &rx_ring->dma, GFP_KERNEL);
1646
1647         if (!rx_ring->desc) {
1648                 pr_err("Unable to allocate memory for the receive descriptor ring\n");
1649                 vfree(rx_ring->buffer_info);
1650                 return -ENOMEM;
1651         }
1652         memset(rx_ring->desc, 0, rx_ring->size);
1653         rx_ring->next_to_clean = 0;
1654         rx_ring->next_to_use = 0;
1655         for (desNo = 0; desNo < rx_ring->count; desNo++) {
1656                 rx_desc = PCH_GBE_RX_DESC(*rx_ring, desNo);
1657                 rx_desc->gbec_status = DSC_INIT16;
1658         }
1659         pr_debug("rx_ring->desc = 0x%p  rx_ring->dma = 0x%08llx "
1660                  "next_to_clean = 0x%08x  next_to_use = 0x%08x\n",
1661                  rx_ring->desc, (unsigned long long)rx_ring->dma,
1662                  rx_ring->next_to_clean, rx_ring->next_to_use);
1663         return 0;
1664 }
1665
1666 /**
1667  * pch_gbe_free_tx_resources - Free Tx Resources
1668  * @adapter:  Board private structure
1669  * @tx_ring:  Tx descriptor ring for a specific queue
1670  */
1671 void pch_gbe_free_tx_resources(struct pch_gbe_adapter *adapter,
1672                                 struct pch_gbe_tx_ring *tx_ring)
1673 {
1674         struct pci_dev *pdev = adapter->pdev;
1675
1676         pch_gbe_clean_tx_ring(adapter, tx_ring);
1677         vfree(tx_ring->buffer_info);
1678         tx_ring->buffer_info = NULL;
1679         pci_free_consistent(pdev, tx_ring->size, tx_ring->desc, tx_ring->dma);
1680         tx_ring->desc = NULL;
1681 }
1682
1683 /**
1684  * pch_gbe_free_rx_resources - Free Rx Resources
1685  * @adapter:  Board private structure
1686  * @rx_ring:  Ring to clean the resources from
1687  */
1688 void pch_gbe_free_rx_resources(struct pch_gbe_adapter *adapter,
1689                                 struct pch_gbe_rx_ring *rx_ring)
1690 {
1691         struct pci_dev *pdev = adapter->pdev;
1692
1693         pch_gbe_clean_rx_ring(adapter, rx_ring);
1694         vfree(rx_ring->buffer_info);
1695         rx_ring->buffer_info = NULL;
1696         pci_free_consistent(pdev, rx_ring->size, rx_ring->desc, rx_ring->dma);
1697         rx_ring->desc = NULL;
1698 }
1699
1700 /**
1701  * pch_gbe_request_irq - Allocate an interrupt line
1702  * @adapter:  Board private structure
1703  * Returns
1704  *      0:              Successfully
1705  *      Negative value: Failed
1706  */
1707 static int pch_gbe_request_irq(struct pch_gbe_adapter *adapter)
1708 {
1709         struct net_device *netdev = adapter->netdev;
1710         int err;
1711         int flags;
1712
1713         flags = IRQF_SHARED;
1714         adapter->have_msi = false;
1715         err = pci_enable_msi(adapter->pdev);
1716         pr_debug("call pci_enable_msi\n");
1717         if (err) {
1718                 pr_debug("call pci_enable_msi - Error: %d\n", err);
1719         } else {
1720                 flags = 0;
1721                 adapter->have_msi = true;
1722         }
1723         err = request_irq(adapter->pdev->irq, &pch_gbe_intr,
1724                           flags, netdev->name, netdev);
1725         if (err)
1726                 pr_err("Unable to allocate interrupt Error: %d\n", err);
1727         pr_debug("adapter->have_msi : %d  flags : 0x%04x  return : 0x%04x\n",
1728                  adapter->have_msi, flags, err);
1729         return err;
1730 }
1731
1732
1733 static void pch_gbe_set_multi(struct net_device *netdev);
1734 /**
1735  * pch_gbe_up - Up GbE network device
1736  * @adapter:  Board private structure
1737  * Returns
1738  *      0:              Successfully
1739  *      Negative value: Failed
1740  */
1741 int pch_gbe_up(struct pch_gbe_adapter *adapter)
1742 {
1743         struct net_device *netdev = adapter->netdev;
1744         struct pch_gbe_tx_ring *tx_ring = adapter->tx_ring;
1745         struct pch_gbe_rx_ring *rx_ring = adapter->rx_ring;
1746         int err;
1747
1748         /* hardware has been reset, we need to reload some things */
1749         pch_gbe_set_multi(netdev);
1750
1751         pch_gbe_setup_tctl(adapter);
1752         pch_gbe_configure_tx(adapter);
1753         pch_gbe_setup_rctl(adapter);
1754         pch_gbe_configure_rx(adapter);
1755
1756         err = pch_gbe_request_irq(adapter);
1757         if (err) {
1758                 pr_err("Error: can't bring device up\n");
1759                 return err;
1760         }
1761         err = pch_gbe_alloc_rx_buffers_pool(adapter, rx_ring, rx_ring->count);
1762         if (err) {
1763                 pr_err("Error: can't bring device up\n");
1764                 return err;
1765         }
1766         pch_gbe_alloc_tx_buffers(adapter, tx_ring);
1767         pch_gbe_alloc_rx_buffers(adapter, rx_ring, rx_ring->count);
1768         adapter->tx_queue_len = netdev->tx_queue_len;
1769         pch_gbe_start_receive(&adapter->hw);
1770
1771         mod_timer(&adapter->watchdog_timer, jiffies);
1772
1773         napi_enable(&adapter->napi);
1774         pch_gbe_irq_enable(adapter);
1775         netif_start_queue(adapter->netdev);
1776
1777         return 0;
1778 }
1779
1780 /**
1781  * pch_gbe_down - Down GbE network device
1782  * @adapter:  Board private structure
1783  */
1784 void pch_gbe_down(struct pch_gbe_adapter *adapter)
1785 {
1786         struct net_device *netdev = adapter->netdev;
1787         struct pch_gbe_rx_ring *rx_ring = adapter->rx_ring;
1788
1789         /* signal that we're down so the interrupt handler does not
1790          * reschedule our watchdog timer */
1791         napi_disable(&adapter->napi);
1792         atomic_set(&adapter->irq_sem, 0);
1793
1794         pch_gbe_irq_disable(adapter);
1795         pch_gbe_free_irq(adapter);
1796
1797         del_timer_sync(&adapter->watchdog_timer);
1798
1799         netdev->tx_queue_len = adapter->tx_queue_len;
1800         netif_carrier_off(netdev);
1801         netif_stop_queue(netdev);
1802
1803         pch_gbe_reset(adapter);
1804         pch_gbe_clean_tx_ring(adapter, adapter->tx_ring);
1805         pch_gbe_clean_rx_ring(adapter, adapter->rx_ring);
1806
1807         pci_free_consistent(adapter->pdev, rx_ring->rx_buff_pool_size,
1808                             rx_ring->rx_buff_pool, rx_ring->rx_buff_pool_logic);
1809         rx_ring->rx_buff_pool_logic = 0;
1810         rx_ring->rx_buff_pool_size = 0;
1811         rx_ring->rx_buff_pool = NULL;
1812 }
1813
1814 /**
1815  * pch_gbe_sw_init - Initialize general software structures (struct pch_gbe_adapter)
1816  * @adapter:  Board private structure to initialize
1817  * Returns
1818  *      0:              Successfully
1819  *      Negative value: Failed
1820  */
1821 static int pch_gbe_sw_init(struct pch_gbe_adapter *adapter)
1822 {
1823         struct pch_gbe_hw *hw = &adapter->hw;
1824         struct net_device *netdev = adapter->netdev;
1825
1826         adapter->rx_buffer_len = PCH_GBE_FRAME_SIZE_2048;
1827         hw->mac.max_frame_size = netdev->mtu + ETH_HLEN + ETH_FCS_LEN;
1828         hw->mac.min_frame_size = ETH_ZLEN + ETH_FCS_LEN;
1829
1830         /* Initialize the hardware-specific values */
1831         if (pch_gbe_hal_setup_init_funcs(hw)) {
1832                 pr_err("Hardware Initialization Failure\n");
1833                 return -EIO;
1834         }
1835         if (pch_gbe_alloc_queues(adapter)) {
1836                 pr_err("Unable to allocate memory for queues\n");
1837                 return -ENOMEM;
1838         }
1839         spin_lock_init(&adapter->hw.miim_lock);
1840         spin_lock_init(&adapter->tx_queue_lock);
1841         spin_lock_init(&adapter->stats_lock);
1842         spin_lock_init(&adapter->ethtool_lock);
1843         atomic_set(&adapter->irq_sem, 0);
1844         pch_gbe_irq_disable(adapter);
1845
1846         pch_gbe_init_stats(adapter);
1847
1848         pr_debug("rx_buffer_len : %d  mac.min_frame_size : %d  mac.max_frame_size : %d\n",
1849                  (u32) adapter->rx_buffer_len,
1850                  hw->mac.min_frame_size, hw->mac.max_frame_size);
1851         return 0;
1852 }
1853
1854 /**
1855  * pch_gbe_open - Called when a network interface is made active
1856  * @netdev:     Network interface device structure
1857  * Returns
1858  *      0:              Successfully
1859  *      Negative value: Failed
1860  */
1861 static int pch_gbe_open(struct net_device *netdev)
1862 {
1863         struct pch_gbe_adapter *adapter = netdev_priv(netdev);
1864         struct pch_gbe_hw *hw = &adapter->hw;
1865         int err;
1866
1867         /* allocate transmit descriptors */
1868         err = pch_gbe_setup_tx_resources(adapter, adapter->tx_ring);
1869         if (err)
1870                 goto err_setup_tx;
1871         /* allocate receive descriptors */
1872         err = pch_gbe_setup_rx_resources(adapter, adapter->rx_ring);
1873         if (err)
1874                 goto err_setup_rx;
1875         pch_gbe_hal_power_up_phy(hw);
1876         err = pch_gbe_up(adapter);
1877         if (err)
1878                 goto err_up;
1879         pr_debug("Success End\n");
1880         return 0;
1881
1882 err_up:
1883         if (!adapter->wake_up_evt)
1884                 pch_gbe_hal_power_down_phy(hw);
1885         pch_gbe_free_rx_resources(adapter, adapter->rx_ring);
1886 err_setup_rx:
1887         pch_gbe_free_tx_resources(adapter, adapter->tx_ring);
1888 err_setup_tx:
1889         pch_gbe_reset(adapter);
1890         pr_err("Error End\n");
1891         return err;
1892 }
1893
1894 /**
1895  * pch_gbe_stop - Disables a network interface
1896  * @netdev:  Network interface device structure
1897  * Returns
1898  *      0: Successfully
1899  */
1900 static int pch_gbe_stop(struct net_device *netdev)
1901 {
1902         struct pch_gbe_adapter *adapter = netdev_priv(netdev);
1903         struct pch_gbe_hw *hw = &adapter->hw;
1904
1905         pch_gbe_down(adapter);
1906         if (!adapter->wake_up_evt)
1907                 pch_gbe_hal_power_down_phy(hw);
1908         pch_gbe_free_tx_resources(adapter, adapter->tx_ring);
1909         pch_gbe_free_rx_resources(adapter, adapter->rx_ring);
1910         return 0;
1911 }
1912
1913 /**
1914  * pch_gbe_xmit_frame - Packet transmitting start
1915  * @skb:     Socket buffer structure
1916  * @netdev:  Network interface device structure
1917  * Returns
1918  *      - NETDEV_TX_OK:   Normal end
1919  *      - NETDEV_TX_BUSY: Error end
1920  */
1921 static int pch_gbe_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
1922 {
1923         struct pch_gbe_adapter *adapter = netdev_priv(netdev);
1924         struct pch_gbe_tx_ring *tx_ring = adapter->tx_ring;
1925         unsigned long flags;
1926
1927         if (unlikely(skb->len > (adapter->hw.mac.max_frame_size - 4))) {
1928                 pr_err("Transfer length Error: skb len: %d > max: %d\n",
1929                        skb->len, adapter->hw.mac.max_frame_size);
1930                 dev_kfree_skb_any(skb);
1931                 adapter->stats.tx_length_errors++;
1932                 return NETDEV_TX_OK;
1933         }
1934         if (!spin_trylock_irqsave(&tx_ring->tx_lock, flags)) {
1935                 /* Collision - tell upper layer to requeue */
1936                 return NETDEV_TX_LOCKED;
1937         }
1938         if (unlikely(!PCH_GBE_DESC_UNUSED(tx_ring))) {
1939                 netif_stop_queue(netdev);
1940                 spin_unlock_irqrestore(&tx_ring->tx_lock, flags);
1941                 pr_debug("Return : BUSY  next_to use : 0x%08x  next_to clean : 0x%08x\n",
1942                          tx_ring->next_to_use, tx_ring->next_to_clean);
1943                 return NETDEV_TX_BUSY;
1944         }
1945         spin_unlock_irqrestore(&tx_ring->tx_lock, flags);
1946
1947         /* CRC,ITAG no support */
1948         pch_gbe_tx_queue(adapter, tx_ring, skb);
1949         return NETDEV_TX_OK;
1950 }
1951
1952 /**
1953  * pch_gbe_get_stats - Get System Network Statistics
1954  * @netdev:  Network interface device structure
1955  * Returns:  The current stats
1956  */
1957 static struct net_device_stats *pch_gbe_get_stats(struct net_device *netdev)
1958 {
1959         /* only return the current stats */
1960         return &netdev->stats;
1961 }
1962
1963 /**
1964  * pch_gbe_set_multi - Multicast and Promiscuous mode set
1965  * @netdev:   Network interface device structure
1966  */
1967 static void pch_gbe_set_multi(struct net_device *netdev)
1968 {
1969         struct pch_gbe_adapter *adapter = netdev_priv(netdev);
1970         struct pch_gbe_hw *hw = &adapter->hw;
1971         struct netdev_hw_addr *ha;
1972         u8 *mta_list;
1973         u32 rctl;
1974         int i;
1975         int mc_count;
1976
1977         pr_debug("netdev->flags : 0x%08x\n", netdev->flags);
1978
1979         /* Check for Promiscuous and All Multicast modes */
1980         rctl = ioread32(&hw->reg->RX_MODE);
1981         mc_count = netdev_mc_count(netdev);
1982         if ((netdev->flags & IFF_PROMISC)) {
1983                 rctl &= ~PCH_GBE_ADD_FIL_EN;
1984                 rctl &= ~PCH_GBE_MLT_FIL_EN;
1985         } else if ((netdev->flags & IFF_ALLMULTI)) {
1986                 /* all the multicasting receive permissions */
1987                 rctl |= PCH_GBE_ADD_FIL_EN;
1988                 rctl &= ~PCH_GBE_MLT_FIL_EN;
1989         } else {
1990                 if (mc_count >= PCH_GBE_MAR_ENTRIES) {
1991                         /* all the multicasting receive permissions */
1992                         rctl |= PCH_GBE_ADD_FIL_EN;
1993                         rctl &= ~PCH_GBE_MLT_FIL_EN;
1994                 } else {
1995                         rctl |= (PCH_GBE_ADD_FIL_EN | PCH_GBE_MLT_FIL_EN);
1996                 }
1997         }
1998         iowrite32(rctl, &hw->reg->RX_MODE);
1999
2000         if (mc_count >= PCH_GBE_MAR_ENTRIES)
2001                 return;
2002         mta_list = kmalloc(mc_count * ETH_ALEN, GFP_ATOMIC);
2003         if (!mta_list)
2004                 return;
2005
2006         /* The shared function expects a packed array of only addresses. */
2007         i = 0;
2008         netdev_for_each_mc_addr(ha, netdev) {
2009                 if (i == mc_count)
2010                         break;
2011                 memcpy(mta_list + (i++ * ETH_ALEN), &ha->addr, ETH_ALEN);
2012         }
2013         pch_gbe_mac_mc_addr_list_update(hw, mta_list, i, 1,
2014                                         PCH_GBE_MAR_ENTRIES);
2015         kfree(mta_list);
2016
2017         pr_debug("RX_MODE reg(check bit31,30 ADD,MLT) : 0x%08x  netdev->mc_count : 0x%08x\n",
2018                  ioread32(&hw->reg->RX_MODE), mc_count);
2019 }
2020
2021 /**
2022  * pch_gbe_set_mac - Change the Ethernet Address of the NIC
2023  * @netdev: Network interface device structure
2024  * @addr:   Pointer to an address structure
2025  * Returns
2026  *      0:              Successfully
2027  *      -EADDRNOTAVAIL: Failed
2028  */
2029 static int pch_gbe_set_mac(struct net_device *netdev, void *addr)
2030 {
2031         struct pch_gbe_adapter *adapter = netdev_priv(netdev);
2032         struct sockaddr *skaddr = addr;
2033         int ret_val;
2034
2035         if (!is_valid_ether_addr(skaddr->sa_data)) {
2036                 ret_val = -EADDRNOTAVAIL;
2037         } else {
2038                 memcpy(netdev->dev_addr, skaddr->sa_data, netdev->addr_len);
2039                 memcpy(adapter->hw.mac.addr, skaddr->sa_data, netdev->addr_len);
2040                 pch_gbe_mac_mar_set(&adapter->hw, adapter->hw.mac.addr, 0);
2041                 ret_val = 0;
2042         }
2043         pr_debug("ret_val : 0x%08x\n", ret_val);
2044         pr_debug("dev_addr : %pM\n", netdev->dev_addr);
2045         pr_debug("mac_addr : %pM\n", adapter->hw.mac.addr);
2046         pr_debug("MAC_ADR1AB reg : 0x%08x 0x%08x\n",
2047                  ioread32(&adapter->hw.reg->mac_adr[0].high),
2048                  ioread32(&adapter->hw.reg->mac_adr[0].low));
2049         return ret_val;
2050 }
2051
2052 /**
2053  * pch_gbe_change_mtu - Change the Maximum Transfer Unit
2054  * @netdev:   Network interface device structure
2055  * @new_mtu:  New value for maximum frame size
2056  * Returns
2057  *      0:              Successfully
2058  *      -EINVAL:        Failed
2059  */
2060 static int pch_gbe_change_mtu(struct net_device *netdev, int new_mtu)
2061 {
2062         struct pch_gbe_adapter *adapter = netdev_priv(netdev);
2063         int max_frame;
2064         unsigned long old_rx_buffer_len = adapter->rx_buffer_len;
2065         int err;
2066
2067         max_frame = new_mtu + ETH_HLEN + ETH_FCS_LEN;
2068         if ((max_frame < ETH_ZLEN + ETH_FCS_LEN) ||
2069                 (max_frame > PCH_GBE_MAX_JUMBO_FRAME_SIZE)) {
2070                 pr_err("Invalid MTU setting\n");
2071                 return -EINVAL;
2072         }
2073         if (max_frame <= PCH_GBE_FRAME_SIZE_2048)
2074                 adapter->rx_buffer_len = PCH_GBE_FRAME_SIZE_2048;
2075         else if (max_frame <= PCH_GBE_FRAME_SIZE_4096)
2076                 adapter->rx_buffer_len = PCH_GBE_FRAME_SIZE_4096;
2077         else if (max_frame <= PCH_GBE_FRAME_SIZE_8192)
2078                 adapter->rx_buffer_len = PCH_GBE_FRAME_SIZE_8192;
2079         else
2080                 adapter->rx_buffer_len = PCH_GBE_MAX_RX_BUFFER_SIZE;
2081
2082         if (netif_running(netdev)) {
2083                 pch_gbe_down(adapter);
2084                 err = pch_gbe_up(adapter);
2085                 if (err) {
2086                         adapter->rx_buffer_len = old_rx_buffer_len;
2087                         pch_gbe_up(adapter);
2088                         return -ENOMEM;
2089                 } else {
2090                         netdev->mtu = new_mtu;
2091                         adapter->hw.mac.max_frame_size = max_frame;
2092                 }
2093         } else {
2094                 pch_gbe_reset(adapter);
2095                 netdev->mtu = new_mtu;
2096                 adapter->hw.mac.max_frame_size = max_frame;
2097         }
2098
2099         pr_debug("max_frame : %d  rx_buffer_len : %d  mtu : %d  max_frame_size : %d\n",
2100                  max_frame, (u32) adapter->rx_buffer_len, netdev->mtu,
2101                  adapter->hw.mac.max_frame_size);
2102         return 0;
2103 }
2104
2105 /**
2106  * pch_gbe_set_features - Reset device after features changed
2107  * @netdev:   Network interface device structure
2108  * @features:  New features
2109  * Returns
2110  *      0:              HW state updated successfully
2111  */
2112 static int pch_gbe_set_features(struct net_device *netdev, u32 features)
2113 {
2114         struct pch_gbe_adapter *adapter = netdev_priv(netdev);
2115         u32 changed = features ^ netdev->features;
2116
2117         if (!(changed & NETIF_F_RXCSUM))
2118                 return 0;
2119
2120         if (netif_running(netdev))
2121                 pch_gbe_reinit_locked(adapter);
2122         else
2123                 pch_gbe_reset(adapter);
2124
2125         return 0;
2126 }
2127
2128 /**
2129  * pch_gbe_ioctl - Controls register through a MII interface
2130  * @netdev:   Network interface device structure
2131  * @ifr:      Pointer to ifr structure
2132  * @cmd:      Control command
2133  * Returns
2134  *      0:      Successfully
2135  *      Negative value: Failed
2136  */
2137 static int pch_gbe_ioctl(struct net_device *netdev, struct ifreq *ifr, int cmd)
2138 {
2139         struct pch_gbe_adapter *adapter = netdev_priv(netdev);
2140
2141         pr_debug("cmd : 0x%04x\n", cmd);
2142
2143         return generic_mii_ioctl(&adapter->mii, if_mii(ifr), cmd, NULL);
2144 }
2145
2146 /**
2147  * pch_gbe_tx_timeout - Respond to a Tx Hang
2148  * @netdev:   Network interface device structure
2149  */
2150 static void pch_gbe_tx_timeout(struct net_device *netdev)
2151 {
2152         struct pch_gbe_adapter *adapter = netdev_priv(netdev);
2153
2154         /* Do the reset outside of interrupt context */
2155         adapter->stats.tx_timeout_count++;
2156         schedule_work(&adapter->reset_task);
2157 }
2158
2159 /**
2160  * pch_gbe_napi_poll - NAPI receive and transfer polling callback
2161  * @napi:    Pointer of polling device struct
2162  * @budget:  The maximum number of a packet
2163  * Returns
2164  *      false:  Exit the polling mode
2165  *      true:   Continue the polling mode
2166  */
2167 static int pch_gbe_napi_poll(struct napi_struct *napi, int budget)
2168 {
2169         struct pch_gbe_adapter *adapter =
2170             container_of(napi, struct pch_gbe_adapter, napi);
2171         int work_done = 0;
2172         bool poll_end_flag = false;
2173         bool cleaned = false;
2174         u32 int_en;
2175
2176         pr_debug("budget : %d\n", budget);
2177
2178         pch_gbe_clean_rx(adapter, adapter->rx_ring, &work_done, budget);
2179         cleaned = pch_gbe_clean_tx(adapter, adapter->tx_ring);
2180
2181         if (!cleaned)
2182                 work_done = budget;
2183         /* If no Tx and not enough Rx work done,
2184          * exit the polling mode
2185          */
2186         if (work_done < budget)
2187                 poll_end_flag = true;
2188
2189         if (poll_end_flag) {
2190                 napi_complete(napi);
2191                 if (adapter->rx_stop_flag) {
2192                         adapter->rx_stop_flag = false;
2193                         pch_gbe_start_receive(&adapter->hw);
2194                 }
2195                 pch_gbe_irq_enable(adapter);
2196         } else
2197                 if (adapter->rx_stop_flag) {
2198                         adapter->rx_stop_flag = false;
2199                         pch_gbe_start_receive(&adapter->hw);
2200                         int_en = ioread32(&adapter->hw.reg->INT_EN);
2201                         iowrite32((int_en | PCH_GBE_INT_RX_FIFO_ERR),
2202                                 &adapter->hw.reg->INT_EN);
2203                 }
2204
2205         pr_debug("poll_end_flag : %d  work_done : %d  budget : %d\n",
2206                  poll_end_flag, work_done, budget);
2207
2208         return work_done;
2209 }
2210
2211 #ifdef CONFIG_NET_POLL_CONTROLLER
2212 /**
2213  * pch_gbe_netpoll - Used by things like netconsole to send skbs
2214  * @netdev:  Network interface device structure
2215  */
2216 static void pch_gbe_netpoll(struct net_device *netdev)
2217 {
2218         struct pch_gbe_adapter *adapter = netdev_priv(netdev);
2219
2220         disable_irq(adapter->pdev->irq);
2221         pch_gbe_intr(adapter->pdev->irq, netdev);
2222         enable_irq(adapter->pdev->irq);
2223 }
2224 #endif
2225
2226 static const struct net_device_ops pch_gbe_netdev_ops = {
2227         .ndo_open = pch_gbe_open,
2228         .ndo_stop = pch_gbe_stop,
2229         .ndo_start_xmit = pch_gbe_xmit_frame,
2230         .ndo_get_stats = pch_gbe_get_stats,
2231         .ndo_set_mac_address = pch_gbe_set_mac,
2232         .ndo_tx_timeout = pch_gbe_tx_timeout,
2233         .ndo_change_mtu = pch_gbe_change_mtu,
2234         .ndo_set_features = pch_gbe_set_features,
2235         .ndo_do_ioctl = pch_gbe_ioctl,
2236         .ndo_set_multicast_list = &pch_gbe_set_multi,
2237 #ifdef CONFIG_NET_POLL_CONTROLLER
2238         .ndo_poll_controller = pch_gbe_netpoll,
2239 #endif
2240 };
2241
2242 static pci_ers_result_t pch_gbe_io_error_detected(struct pci_dev *pdev,
2243                                                 pci_channel_state_t state)
2244 {
2245         struct net_device *netdev = pci_get_drvdata(pdev);
2246         struct pch_gbe_adapter *adapter = netdev_priv(netdev);
2247
2248         netif_device_detach(netdev);
2249         if (netif_running(netdev))
2250                 pch_gbe_down(adapter);
2251         pci_disable_device(pdev);
2252         /* Request a slot slot reset. */
2253         return PCI_ERS_RESULT_NEED_RESET;
2254 }
2255
2256 static pci_ers_result_t pch_gbe_io_slot_reset(struct pci_dev *pdev)
2257 {
2258         struct net_device *netdev = pci_get_drvdata(pdev);
2259         struct pch_gbe_adapter *adapter = netdev_priv(netdev);
2260         struct pch_gbe_hw *hw = &adapter->hw;
2261
2262         if (pci_enable_device(pdev)) {
2263                 pr_err("Cannot re-enable PCI device after reset\n");
2264                 return PCI_ERS_RESULT_DISCONNECT;
2265         }
2266         pci_set_master(pdev);
2267         pci_enable_wake(pdev, PCI_D0, 0);
2268         pch_gbe_hal_power_up_phy(hw);
2269         pch_gbe_reset(adapter);
2270         /* Clear wake up status */
2271         pch_gbe_mac_set_wol_event(hw, 0);
2272
2273         return PCI_ERS_RESULT_RECOVERED;
2274 }
2275
2276 static void pch_gbe_io_resume(struct pci_dev *pdev)
2277 {
2278         struct net_device *netdev = pci_get_drvdata(pdev);
2279         struct pch_gbe_adapter *adapter = netdev_priv(netdev);
2280
2281         if (netif_running(netdev)) {
2282                 if (pch_gbe_up(adapter)) {
2283                         pr_debug("can't bring device back up after reset\n");
2284                         return;
2285                 }
2286         }
2287         netif_device_attach(netdev);
2288 }
2289
2290 static int __pch_gbe_suspend(struct pci_dev *pdev)
2291 {
2292         struct net_device *netdev = pci_get_drvdata(pdev);
2293         struct pch_gbe_adapter *adapter = netdev_priv(netdev);
2294         struct pch_gbe_hw *hw = &adapter->hw;
2295         u32 wufc = adapter->wake_up_evt;
2296         int retval = 0;
2297
2298         netif_device_detach(netdev);
2299         if (netif_running(netdev))
2300                 pch_gbe_down(adapter);
2301         if (wufc) {
2302                 pch_gbe_set_multi(netdev);
2303                 pch_gbe_setup_rctl(adapter);
2304                 pch_gbe_configure_rx(adapter);
2305                 pch_gbe_set_rgmii_ctrl(adapter, hw->mac.link_speed,
2306                                         hw->mac.link_duplex);
2307                 pch_gbe_set_mode(adapter, hw->mac.link_speed,
2308                                         hw->mac.link_duplex);
2309                 pch_gbe_mac_set_wol_event(hw, wufc);
2310                 pci_disable_device(pdev);
2311         } else {
2312                 pch_gbe_hal_power_down_phy(hw);
2313                 pch_gbe_mac_set_wol_event(hw, wufc);
2314                 pci_disable_device(pdev);
2315         }
2316         return retval;
2317 }
2318
2319 #ifdef CONFIG_PM
2320 static int pch_gbe_suspend(struct device *device)
2321 {
2322         struct pci_dev *pdev = to_pci_dev(device);
2323
2324         return __pch_gbe_suspend(pdev);
2325 }
2326
2327 static int pch_gbe_resume(struct device *device)
2328 {
2329         struct pci_dev *pdev = to_pci_dev(device);
2330         struct net_device *netdev = pci_get_drvdata(pdev);
2331         struct pch_gbe_adapter *adapter = netdev_priv(netdev);
2332         struct pch_gbe_hw *hw = &adapter->hw;
2333         u32 err;
2334
2335         err = pci_enable_device(pdev);
2336         if (err) {
2337                 pr_err("Cannot enable PCI device from suspend\n");
2338                 return err;
2339         }
2340         pci_set_master(pdev);
2341         pch_gbe_hal_power_up_phy(hw);
2342         pch_gbe_reset(adapter);
2343         /* Clear wake on lan control and status */
2344         pch_gbe_mac_set_wol_event(hw, 0);
2345
2346         if (netif_running(netdev))
2347                 pch_gbe_up(adapter);
2348         netif_device_attach(netdev);
2349
2350         return 0;
2351 }
2352 #endif /* CONFIG_PM */
2353
2354 static void pch_gbe_shutdown(struct pci_dev *pdev)
2355 {
2356         __pch_gbe_suspend(pdev);
2357         if (system_state == SYSTEM_POWER_OFF) {
2358                 pci_wake_from_d3(pdev, true);
2359                 pci_set_power_state(pdev, PCI_D3hot);
2360         }
2361 }
2362
2363 static void pch_gbe_remove(struct pci_dev *pdev)
2364 {
2365         struct net_device *netdev = pci_get_drvdata(pdev);
2366         struct pch_gbe_adapter *adapter = netdev_priv(netdev);
2367
2368         cancel_work_sync(&adapter->reset_task);
2369         unregister_netdev(netdev);
2370
2371         pch_gbe_hal_phy_hw_reset(&adapter->hw);
2372
2373         kfree(adapter->tx_ring);
2374         kfree(adapter->rx_ring);
2375
2376         iounmap(adapter->hw.reg);
2377         pci_release_regions(pdev);
2378         free_netdev(netdev);
2379         pci_disable_device(pdev);
2380 }
2381
2382 static int pch_gbe_probe(struct pci_dev *pdev,
2383                           const struct pci_device_id *pci_id)
2384 {
2385         struct net_device *netdev;
2386         struct pch_gbe_adapter *adapter;
2387         int ret;
2388
2389         ret = pci_enable_device(pdev);
2390         if (ret)
2391                 return ret;
2392
2393         if (pci_set_dma_mask(pdev, DMA_BIT_MASK(64))
2394                 || pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64))) {
2395                 ret = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
2396                 if (ret) {
2397                         ret = pci_set_consistent_dma_mask(pdev,
2398                                                           DMA_BIT_MASK(32));
2399                         if (ret) {
2400                                 dev_err(&pdev->dev, "ERR: No usable DMA "
2401                                         "configuration, aborting\n");
2402                                 goto err_disable_device;
2403                         }
2404                 }
2405         }
2406
2407         ret = pci_request_regions(pdev, KBUILD_MODNAME);
2408         if (ret) {
2409                 dev_err(&pdev->dev,
2410                         "ERR: Can't reserve PCI I/O and memory resources\n");
2411                 goto err_disable_device;
2412         }
2413         pci_set_master(pdev);
2414
2415         netdev = alloc_etherdev((int)sizeof(struct pch_gbe_adapter));
2416         if (!netdev) {
2417                 ret = -ENOMEM;
2418                 dev_err(&pdev->dev,
2419                         "ERR: Can't allocate and set up an Ethernet device\n");
2420                 goto err_release_pci;
2421         }
2422         SET_NETDEV_DEV(netdev, &pdev->dev);
2423
2424         pci_set_drvdata(pdev, netdev);
2425         adapter = netdev_priv(netdev);
2426         adapter->netdev = netdev;
2427         adapter->pdev = pdev;
2428         adapter->hw.back = adapter;
2429         adapter->hw.reg = pci_iomap(pdev, PCH_GBE_PCI_BAR, 0);
2430         if (!adapter->hw.reg) {
2431                 ret = -EIO;
2432                 dev_err(&pdev->dev, "Can't ioremap\n");
2433                 goto err_free_netdev;
2434         }
2435
2436         netdev->netdev_ops = &pch_gbe_netdev_ops;
2437         netdev->watchdog_timeo = PCH_GBE_WATCHDOG_PERIOD;
2438         netif_napi_add(netdev, &adapter->napi,
2439                        pch_gbe_napi_poll, PCH_GBE_RX_WEIGHT);
2440         netdev->hw_features = NETIF_F_RXCSUM |
2441                 NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM;
2442         netdev->features = netdev->hw_features;
2443         pch_gbe_set_ethtool_ops(netdev);
2444
2445         pch_gbe_mac_load_mac_addr(&adapter->hw);
2446         pch_gbe_mac_reset_hw(&adapter->hw);
2447
2448         /* setup the private structure */
2449         ret = pch_gbe_sw_init(adapter);
2450         if (ret)
2451                 goto err_iounmap;
2452
2453         /* Initialize PHY */
2454         ret = pch_gbe_init_phy(adapter);
2455         if (ret) {
2456                 dev_err(&pdev->dev, "PHY initialize error\n");
2457                 goto err_free_adapter;
2458         }
2459         pch_gbe_hal_get_bus_info(&adapter->hw);
2460
2461         /* Read the MAC address. and store to the private data */
2462         ret = pch_gbe_hal_read_mac_addr(&adapter->hw);
2463         if (ret) {
2464                 dev_err(&pdev->dev, "MAC address Read Error\n");
2465                 goto err_free_adapter;
2466         }
2467
2468         memcpy(netdev->dev_addr, adapter->hw.mac.addr, netdev->addr_len);
2469         if (!is_valid_ether_addr(netdev->dev_addr)) {
2470                 dev_err(&pdev->dev, "Invalid MAC Address\n");
2471                 ret = -EIO;
2472                 goto err_free_adapter;
2473         }
2474         setup_timer(&adapter->watchdog_timer, pch_gbe_watchdog,
2475                     (unsigned long)adapter);
2476
2477         INIT_WORK(&adapter->reset_task, pch_gbe_reset_task);
2478
2479         pch_gbe_check_options(adapter);
2480
2481         /* initialize the wol settings based on the eeprom settings */
2482         adapter->wake_up_evt = PCH_GBE_WL_INIT_SETTING;
2483         dev_info(&pdev->dev, "MAC address : %pM\n", netdev->dev_addr);
2484
2485         /* reset the hardware with the new settings */
2486         pch_gbe_reset(adapter);
2487
2488         ret = register_netdev(netdev);
2489         if (ret)
2490                 goto err_free_adapter;
2491         /* tell the stack to leave us alone until pch_gbe_open() is called */
2492         netif_carrier_off(netdev);
2493         netif_stop_queue(netdev);
2494
2495         dev_dbg(&pdev->dev, "OKIsemi(R) PCH Network Connection\n");
2496
2497         device_set_wakeup_enable(&pdev->dev, 1);
2498         return 0;
2499
2500 err_free_adapter:
2501         pch_gbe_hal_phy_hw_reset(&adapter->hw);
2502         kfree(adapter->tx_ring);
2503         kfree(adapter->rx_ring);
2504 err_iounmap:
2505         iounmap(adapter->hw.reg);
2506 err_free_netdev:
2507         free_netdev(netdev);
2508 err_release_pci:
2509         pci_release_regions(pdev);
2510 err_disable_device:
2511         pci_disable_device(pdev);
2512         return ret;
2513 }
2514
2515 static DEFINE_PCI_DEVICE_TABLE(pch_gbe_pcidev_id) = {
2516         {.vendor = PCI_VENDOR_ID_INTEL,
2517          .device = PCI_DEVICE_ID_INTEL_IOH1_GBE,
2518          .subvendor = PCI_ANY_ID,
2519          .subdevice = PCI_ANY_ID,
2520          .class = (PCI_CLASS_NETWORK_ETHERNET << 8),
2521          .class_mask = (0xFFFF00)
2522          },
2523         {.vendor = PCI_VENDOR_ID_ROHM,
2524          .device = PCI_DEVICE_ID_ROHM_ML7223_GBE,
2525          .subvendor = PCI_ANY_ID,
2526          .subdevice = PCI_ANY_ID,
2527          .class = (PCI_CLASS_NETWORK_ETHERNET << 8),
2528          .class_mask = (0xFFFF00)
2529          },
2530         {.vendor = PCI_VENDOR_ID_ROHM,
2531          .device = PCI_DEVICE_ID_ROHM_ML7831_GBE,
2532          .subvendor = PCI_ANY_ID,
2533          .subdevice = PCI_ANY_ID,
2534          .class = (PCI_CLASS_NETWORK_ETHERNET << 8),
2535          .class_mask = (0xFFFF00)
2536          },
2537         /* required last entry */
2538         {0}
2539 };
2540
2541 #ifdef CONFIG_PM
2542 static const struct dev_pm_ops pch_gbe_pm_ops = {
2543         .suspend = pch_gbe_suspend,
2544         .resume = pch_gbe_resume,
2545         .freeze = pch_gbe_suspend,
2546         .thaw = pch_gbe_resume,
2547         .poweroff = pch_gbe_suspend,
2548         .restore = pch_gbe_resume,
2549 };
2550 #endif
2551
2552 static struct pci_error_handlers pch_gbe_err_handler = {
2553         .error_detected = pch_gbe_io_error_detected,
2554         .slot_reset = pch_gbe_io_slot_reset,
2555         .resume = pch_gbe_io_resume
2556 };
2557
2558 static struct pci_driver pch_gbe_driver = {
2559         .name = KBUILD_MODNAME,
2560         .id_table = pch_gbe_pcidev_id,
2561         .probe = pch_gbe_probe,
2562         .remove = pch_gbe_remove,
2563 #ifdef CONFIG_PM
2564         .driver.pm = &pch_gbe_pm_ops,
2565 #endif
2566         .shutdown = pch_gbe_shutdown,
2567         .err_handler = &pch_gbe_err_handler
2568 };
2569
2570
2571 static int __init pch_gbe_init_module(void)
2572 {
2573         int ret;
2574
2575         ret = pci_register_driver(&pch_gbe_driver);
2576         if (copybreak != PCH_GBE_COPYBREAK_DEFAULT) {
2577                 if (copybreak == 0) {
2578                         pr_info("copybreak disabled\n");
2579                 } else {
2580                         pr_info("copybreak enabled for packets <= %u bytes\n",
2581                                 copybreak);
2582                 }
2583         }
2584         return ret;
2585 }
2586
2587 static void __exit pch_gbe_exit_module(void)
2588 {
2589         pci_unregister_driver(&pch_gbe_driver);
2590 }
2591
2592 module_init(pch_gbe_init_module);
2593 module_exit(pch_gbe_exit_module);
2594
2595 MODULE_DESCRIPTION("EG20T PCH Gigabit ethernet Driver");
2596 MODULE_AUTHOR("OKI SEMICONDUCTOR, <toshiharu-linux@dsn.okisemi.com>");
2597 MODULE_LICENSE("GPL");
2598 MODULE_VERSION(DRV_VERSION);
2599 MODULE_DEVICE_TABLE(pci, pch_gbe_pcidev_id);
2600
2601 module_param(copybreak, uint, 0644);
2602 MODULE_PARM_DESC(copybreak,
2603         "Maximum size of packet that is copied to a new buffer on receive");
2604
2605 /* pch_gbe_main.c */