drivers/net/ethernet/atheros/atl1c/atl1c_main.c

   1 /*
   2  * Copyright(c) 2008 - 2009 Atheros Corporation. All rights reserved.
   3  *
   4  * Derived from Intel e1000 driver
   5  * Copyright(c) 1999 - 2005 Intel Corporation. All rights reserved.
   6  *
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the terms of the GNU General Public License as published by the Free
   9  * Software Foundation; either version 2 of the License, or (at your option)
  10  * any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful, but WITHOUT
  13  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  15  * more details.
  16  *
  17  * You should have received a copy of the GNU General Public License along with
  18  * this program; if not, write to the Free Software Foundation, Inc., 59
  19  * Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  20  */
  21
  22 #include "atl1c.h"
  23
  24 #define ATL1C_DRV_VERSION "1.0.1.0-NAPI"
  25 char atl1c_driver_name[] = "atl1c";
  26 char atl1c_driver_version[] = ATL1C_DRV_VERSION;
  27
  28 /*
  29  * atl1c_pci_tbl - PCI Device ID Table
  30  *
  31  * Wildcard entries (PCI_ANY_ID) should come last
  32  * Last entry must be all 0s
  33  *
  34  * { Vendor ID, Device ID, SubVendor ID, SubDevice ID,
  35  *   Class, Class Mask, private data (not used) }
  36  */
  37 static DEFINE_PCI_DEVICE_TABLE(atl1c_pci_tbl) = {
  38         {PCI_DEVICE(PCI_VENDOR_ID_ATTANSIC, PCI_DEVICE_ID_ATTANSIC_L1C)},
  39         {PCI_DEVICE(PCI_VENDOR_ID_ATTANSIC, PCI_DEVICE_ID_ATTANSIC_L2C)},
  40         {PCI_DEVICE(PCI_VENDOR_ID_ATTANSIC, PCI_DEVICE_ID_ATHEROS_L2C_B)},
  41         {PCI_DEVICE(PCI_VENDOR_ID_ATTANSIC, PCI_DEVICE_ID_ATHEROS_L2C_B2)},
  42         {PCI_DEVICE(PCI_VENDOR_ID_ATTANSIC, PCI_DEVICE_ID_ATHEROS_L1D)},
  43         {PCI_DEVICE(PCI_VENDOR_ID_ATTANSIC, PCI_DEVICE_ID_ATHEROS_L1D_2_0)},
  44         /* required last entry */
  45         { 0 }
  46 };
  47 MODULE_DEVICE_TABLE(pci, atl1c_pci_tbl);
  48
  49 MODULE_AUTHOR("Jie Yang");
  50 MODULE_AUTHOR("Qualcomm Atheros Inc., <nic-devel@qualcomm.com>");
  51 MODULE_DESCRIPTION("Qualcom Atheros 100/1000M Ethernet Network Driver");
  52 MODULE_LICENSE("GPL");
  53 MODULE_VERSION(ATL1C_DRV_VERSION);
  54
  55 static int atl1c_stop_mac(struct atl1c_hw *hw);
  56 static void atl1c_disable_l0s_l1(struct atl1c_hw *hw);
  57 static void atl1c_set_aspm(struct atl1c_hw *hw, u16 link_speed);
  58 static void atl1c_start_mac(struct atl1c_adapter *adapter);
  59 static void atl1c_clean_rx_irq(struct atl1c_adapter *adapter,
  60                    int *work_done, int work_to_do);
  61 static int atl1c_up(struct atl1c_adapter *adapter);
  62 static void atl1c_down(struct atl1c_adapter *adapter);
  63 static int atl1c_reset_mac(struct atl1c_hw *hw);
  64 static void atl1c_reset_dma_ring(struct atl1c_adapter *adapter);
  65 static int atl1c_configure(struct atl1c_adapter *adapter);
  66 static int atl1c_alloc_rx_buffer(struct atl1c_adapter *adapter);
  67
  68 static const u16 atl1c_pay_load_size[] = {
  69         128, 256, 512, 1024, 2048, 4096,
  70 };
  71
  72
  73 static const u32 atl1c_default_msg = NETIF_MSG_DRV | NETIF_MSG_PROBE |
  74         NETIF_MSG_LINK | NETIF_MSG_TIMER | NETIF_MSG_IFDOWN | NETIF_MSG_IFUP;
  75 static void atl1c_pcie_patch(struct atl1c_hw *hw)
  76 {
  77         u32 mst_data, data;
  78
  79         /* pclk sel could switch to 25M */
  80         AT_READ_REG(hw, REG_MASTER_CTRL, &mst_data);
  81         mst_data &= ~MASTER_CTRL_CLK_SEL_DIS;
  82         AT_WRITE_REG(hw, REG_MASTER_CTRL, mst_data);
  83
  84         /* WoL/PCIE related settings */
  85         if (hw->nic_type == athr_l1c || hw->nic_type == athr_l2c) {
  86                 AT_READ_REG(hw, REG_PCIE_PHYMISC, &data);
  87                 data |= PCIE_PHYMISC_FORCE_RCV_DET;
  88                 AT_WRITE_REG(hw, REG_PCIE_PHYMISC, data);
  89         } else { /* new dev set bit5 of MASTER */
  90                 if (!(mst_data & MASTER_CTRL_WAKEN_25M))
  91                         AT_WRITE_REG(hw, REG_MASTER_CTRL,
  92                                 mst_data | MASTER_CTRL_WAKEN_25M);
  93         }
  94         /* aspm/PCIE setting only for l2cb 1.0 */
  95         if (hw->nic_type == athr_l2c_b && hw->revision_id == L2CB_V10) {
  96                 AT_READ_REG(hw, REG_PCIE_PHYMISC2, &data);
  97                 data = FIELD_SETX(data, PCIE_PHYMISC2_CDR_BW,
  98                         L2CB1_PCIE_PHYMISC2_CDR_BW);
  99                 data = FIELD_SETX(data, PCIE_PHYMISC2_L0S_TH,
 100                         L2CB1_PCIE_PHYMISC2_L0S_TH);
 101                 AT_WRITE_REG(hw, REG_PCIE_PHYMISC2, data);
 102                 /* extend L1 sync timer */
 103                 AT_READ_REG(hw, REG_LINK_CTRL, &data);
 104                 data |= LINK_CTRL_EXT_SYNC;
 105                 AT_WRITE_REG(hw, REG_LINK_CTRL, data);
 106         }
 107         /* l2cb 1.x & l1d 1.x */
 108         if (hw->nic_type == athr_l2c_b || hw->nic_type == athr_l1d) {
 109                 AT_READ_REG(hw, REG_PM_CTRL, &data);
 110                 data |= PM_CTRL_L0S_BUFSRX_EN;
 111                 AT_WRITE_REG(hw, REG_PM_CTRL, data);
 112                 /* clear vendor msg */
 113                 AT_READ_REG(hw, REG_DMA_DBG, &data);
 114                 AT_WRITE_REG(hw, REG_DMA_DBG, data & ~DMA_DBG_VENDOR_MSG);
 115         }
 116 }
 117
 118 /* FIXME: no need any more ? */
 119 /*
 120  * atl1c_init_pcie - init PCIE module
 121  */
 122 static void atl1c_reset_pcie(struct atl1c_hw *hw, u32 flag)
 123 {
 124         u32 data;
 125         u32 pci_cmd;
 126         struct pci_dev *pdev = hw->adapter->pdev;
 127         int pos;
 128
 129         AT_READ_REG(hw, PCI_COMMAND, &pci_cmd);
 130         pci_cmd &= ~PCI_COMMAND_INTX_DISABLE;
 131         pci_cmd |= (PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER |
 132                 PCI_COMMAND_IO);
 133         AT_WRITE_REG(hw, PCI_COMMAND, pci_cmd);
 134
 135         /*
 136          * Clear any PowerSaveing Settings
 137          */
 138         pci_enable_wake(pdev, PCI_D3hot, 0);
 139         pci_enable_wake(pdev, PCI_D3cold, 0);
 140         /* wol sts read-clear */
 141         AT_READ_REG(hw, REG_WOL_CTRL, &data);
 142         AT_WRITE_REG(hw, REG_WOL_CTRL, 0);
 143
 144         /*
 145          * Mask some pcie error bits
 146          */
 147         pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_ERR);
 148         pci_read_config_dword(pdev, pos + PCI_ERR_UNCOR_SEVER, &data);
 149         data &= ~(PCI_ERR_UNC_DLP | PCI_ERR_UNC_FCP);
 150         pci_write_config_dword(pdev, pos + PCI_ERR_UNCOR_SEVER, data);
 151         /* clear error status */
 152         pcie_capability_write_word(pdev, PCI_EXP_DEVSTA,
 153                         PCI_EXP_DEVSTA_NFED |
 154                         PCI_EXP_DEVSTA_FED |
 155                         PCI_EXP_DEVSTA_CED |
 156                         PCI_EXP_DEVSTA_URD);
 157
 158         AT_READ_REG(hw, REG_LTSSM_ID_CTRL, &data);
 159         data &= ~LTSSM_ID_EN_WRO;
 160         AT_WRITE_REG(hw, REG_LTSSM_ID_CTRL, data);
 161
 162         atl1c_pcie_patch(hw);
 163         if (flag & ATL1C_PCIE_L0S_L1_DISABLE)
 164                 atl1c_disable_l0s_l1(hw);
 165
 166         msleep(5);
 167 }
 168
 169 /**
 170  * atl1c_irq_enable - Enable default interrupt generation settings
 171  * @adapter: board private structure
 172  */
 173 static inline void atl1c_irq_enable(struct atl1c_adapter *adapter)
 174 {
 175         if (likely(atomic_dec_and_test(&adapter->irq_sem))) {
 176                 AT_WRITE_REG(&adapter->hw, REG_ISR, 0x7FFFFFFF);
 177                 AT_WRITE_REG(&adapter->hw, REG_IMR, adapter->hw.intr_mask);
 178                 AT_WRITE_FLUSH(&adapter->hw);
 179         }
 180 }
 181
 182 /**
 183  * atl1c_irq_disable - Mask off interrupt generation on the NIC
 184  * @adapter: board private structure
 185  */
 186 static inline void atl1c_irq_disable(struct atl1c_adapter *adapter)
 187 {
 188         atomic_inc(&adapter->irq_sem);
 189         AT_WRITE_REG(&adapter->hw, REG_IMR, 0);
 190         AT_WRITE_REG(&adapter->hw, REG_ISR, ISR_DIS_INT);
 191         AT_WRITE_FLUSH(&adapter->hw);
 192         synchronize_irq(adapter->pdev->irq);
 193 }
 194
 195 /**
 196  * atl1c_irq_reset - reset interrupt confiure on the NIC
 197  * @adapter: board private structure
 198  */
 199 static inline void atl1c_irq_reset(struct atl1c_adapter *adapter)
 200 {
 201         atomic_set(&adapter->irq_sem, 1);
 202         atl1c_irq_enable(adapter);
 203 }
 204
 205 /*
 206  * atl1c_wait_until_idle - wait up to AT_HW_MAX_IDLE_DELAY reads
 207  * of the idle status register until the device is actually idle
 208  */
 209 static u32 atl1c_wait_until_idle(struct atl1c_hw *hw, u32 modu_ctrl)
 210 {
 211         int timeout;
 212         u32 data;
 213
 214         for (timeout = 0; timeout < AT_HW_MAX_IDLE_DELAY; timeout++) {
 215                 AT_READ_REG(hw, REG_IDLE_STATUS, &data);
 216                 if ((data & modu_ctrl) == 0)
 217                         return 0;
 218                 msleep(1);
 219         }
 220         return data;
 221 }
 222
 223 /**
 224  * atl1c_phy_config - Timer Call-back
 225  * @data: pointer to netdev cast into an unsigned long
 226  */
 227 static void atl1c_phy_config(unsigned long data)
 228 {
 229         struct atl1c_adapter *adapter = (struct atl1c_adapter *) data;
 230         struct atl1c_hw *hw = &adapter->hw;
 231         unsigned long flags;
 232
 233         spin_lock_irqsave(&adapter->mdio_lock, flags);
 234         atl1c_restart_autoneg(hw);
 235         spin_unlock_irqrestore(&adapter->mdio_lock, flags);
 236 }
 237
 238 void atl1c_reinit_locked(struct atl1c_adapter *adapter)
 239 {
 240         WARN_ON(in_interrupt());
 241         atl1c_down(adapter);
 242         atl1c_up(adapter);
 243         clear_bit(__AT_RESETTING, &adapter->flags);
 244 }
 245
 246 static void atl1c_check_link_status(struct atl1c_adapter *adapter)
 247 {
 248         struct atl1c_hw *hw = &adapter->hw;
 249         struct net_device *netdev = adapter->netdev;
 250         struct pci_dev    *pdev   = adapter->pdev;
 251         int err;
 252         unsigned long flags;
 253         u16 speed, duplex, phy_data;
 254
 255         spin_lock_irqsave(&adapter->mdio_lock, flags);
 256         /* MII_BMSR must read twise */
 257         atl1c_read_phy_reg(hw, MII_BMSR, &phy_data);
 258         atl1c_read_phy_reg(hw, MII_BMSR, &phy_data);
 259         spin_unlock_irqrestore(&adapter->mdio_lock, flags);
 260
 261         if ((phy_data & BMSR_LSTATUS) == 0) {
 262                 /* link down */
 263                 netif_carrier_off(netdev);
 264                 hw->hibernate = true;
 265                 if (atl1c_reset_mac(hw) != 0)
 266                         if (netif_msg_hw(adapter))
 267                                 dev_warn(&pdev->dev, "reset mac failed\n");
 268                 atl1c_set_aspm(hw, SPEED_0);
 269                 atl1c_post_phy_linkchg(hw, SPEED_0);
 270                 atl1c_reset_dma_ring(adapter);
 271                 atl1c_configure(adapter);
 272         } else {
 273                 /* Link Up */
 274                 hw->hibernate = false;
 275                 spin_lock_irqsave(&adapter->mdio_lock, flags);
 276                 err = atl1c_get_speed_and_duplex(hw, &speed, &duplex);
 277                 spin_unlock_irqrestore(&adapter->mdio_lock, flags);
 278                 if (unlikely(err))
 279                         return;
 280                 /* link result is our setting */
 281                 if (adapter->link_speed != speed ||
 282                     adapter->link_duplex != duplex) {
 283                         adapter->link_speed  = speed;
 284                         adapter->link_duplex = duplex;
 285                         atl1c_set_aspm(hw, speed);
 286                         atl1c_post_phy_linkchg(hw, speed);
 287                         atl1c_start_mac(adapter);
 288                         if (netif_msg_link(adapter))
 289                                 dev_info(&pdev->dev,
 290                                         "%s: %s NIC Link is Up<%d Mbps %s>\n",
 291                                         atl1c_driver_name, netdev->name,
 292                                         adapter->link_speed,
 293                                         adapter->link_duplex == FULL_DUPLEX ?
 294                                         "Full Duplex" : "Half Duplex");
 295                 }
 296                 if (!netif_carrier_ok(netdev))
 297                         netif_carrier_on(netdev);
 298         }
 299 }
 300
 301 static void atl1c_link_chg_event(struct atl1c_adapter *adapter)
 302 {
 303         struct net_device *netdev = adapter->netdev;
 304         struct pci_dev    *pdev   = adapter->pdev;
 305         u16 phy_data;
 306         u16 link_up;
 307
 308         spin_lock(&adapter->mdio_lock);
 309         atl1c_read_phy_reg(&adapter->hw, MII_BMSR, &phy_data);
 310         atl1c_read_phy_reg(&adapter->hw, MII_BMSR, &phy_data);
 311         spin_unlock(&adapter->mdio_lock);
 312         link_up = phy_data & BMSR_LSTATUS;
 313         /* notify upper layer link down ASAP */
 314         if (!link_up) {
 315                 if (netif_carrier_ok(netdev)) {
 316                         /* old link state: Up */
 317                         netif_carrier_off(netdev);
 318                         if (netif_msg_link(adapter))
 319                                 dev_info(&pdev->dev,
 320                                         "%s: %s NIC Link is Down\n",
 321                                         atl1c_driver_name, netdev->name);
 322                         adapter->link_speed = SPEED_0;
 323                 }
 324         }
 325
 326         set_bit(ATL1C_WORK_EVENT_LINK_CHANGE, &adapter->work_event);
 327         schedule_work(&adapter->common_task);
 328 }
 329
 330 static void atl1c_common_task(struct work_struct *work)
 331 {
 332         struct atl1c_adapter *adapter;
 333         struct net_device *netdev;
 334
 335         adapter = container_of(work, struct atl1c_adapter, common_task);
 336         netdev = adapter->netdev;
 337
 338         if (test_bit(__AT_DOWN, &adapter->flags))
 339                 return;
 340
 341         if (test_and_clear_bit(ATL1C_WORK_EVENT_RESET, &adapter->work_event)) {
 342                 netif_device_detach(netdev);
 343                 atl1c_down(adapter);
 344                 atl1c_up(adapter);
 345                 netif_device_attach(netdev);
 346         }
 347
 348         if (test_and_clear_bit(ATL1C_WORK_EVENT_LINK_CHANGE,
 349                 &adapter->work_event)) {
 350                 atl1c_irq_disable(adapter);
 351                 atl1c_check_link_status(adapter);
 352                 atl1c_irq_enable(adapter);
 353         }
 354 }
 355
 356
 357 static void atl1c_del_timer(struct atl1c_adapter *adapter)
 358 {
 359         del_timer_sync(&adapter->phy_config_timer);
 360 }
 361
 362
 363 /**
 364  * atl1c_tx_timeout - Respond to a Tx Hang
 365  * @netdev: network interface device structure
 366  */
 367 static void atl1c_tx_timeout(struct net_device *netdev)
 368 {
 369         struct atl1c_adapter *adapter = netdev_priv(netdev);
 370
 371         /* Do the reset outside of interrupt context */
 372         set_bit(ATL1C_WORK_EVENT_RESET, &adapter->work_event);
 373         schedule_work(&adapter->common_task);
 374 }
 375
 376 /**
 377  * atl1c_set_multi - Multicast and Promiscuous mode set
 378  * @netdev: network interface device structure
 379  *
 380  * The set_multi entry point is called whenever the multicast address
 381  * list or the network interface flags are updated.  This routine is
 382  * responsible for configuring the hardware for proper multicast,
 383  * promiscuous mode, and all-multi behavior.
 384  */
 385 static void atl1c_set_multi(struct net_device *netdev)
 386 {
 387         struct atl1c_adapter *adapter = netdev_priv(netdev);
 388         struct atl1c_hw *hw = &adapter->hw;
 389         struct netdev_hw_addr *ha;
 390         u32 mac_ctrl_data;
 391         u32 hash_value;
 392
 393         /* Check for Promiscuous and All Multicast modes */
 394         AT_READ_REG(hw, REG_MAC_CTRL, &mac_ctrl_data);
 395
 396         if (netdev->flags & IFF_PROMISC) {
 397                 mac_ctrl_data |= MAC_CTRL_PROMIS_EN;
 398         } else if (netdev->flags & IFF_ALLMULTI) {
 399                 mac_ctrl_data |= MAC_CTRL_MC_ALL_EN;
 400                 mac_ctrl_data &= ~MAC_CTRL_PROMIS_EN;
 401         } else {
 402                 mac_ctrl_data &= ~(MAC_CTRL_PROMIS_EN | MAC_CTRL_MC_ALL_EN);
 403         }
 404
 405         AT_WRITE_REG(hw, REG_MAC_CTRL, mac_ctrl_data);
 406
 407         /* clear the old settings from the multicast hash table */
 408         AT_WRITE_REG(hw, REG_RX_HASH_TABLE, 0);
 409         AT_WRITE_REG_ARRAY(hw, REG_RX_HASH_TABLE, 1, 0);
 410
 411         /* comoute mc addresses' hash value ,and put it into hash table */
 412         netdev_for_each_mc_addr(ha, netdev) {
 413                 hash_value = atl1c_hash_mc_addr(hw, ha->addr);
 414                 atl1c_hash_set(hw, hash_value);
 415         }
 416 }
 417
 418 static void __atl1c_vlan_mode(netdev_features_t features, u32 *mac_ctrl_data)
 419 {
 420         if (features & NETIF_F_HW_VLAN_RX) {
 421                 /* enable VLAN tag insert/strip */
 422                 *mac_ctrl_data |= MAC_CTRL_RMV_VLAN;
 423         } else {
 424                 /* disable VLAN tag insert/strip */
 425                 *mac_ctrl_data &= ~MAC_CTRL_RMV_VLAN;
 426         }
 427 }
 428
 429 static void atl1c_vlan_mode(struct net_device *netdev,
 430         netdev_features_t features)
 431 {
 432         struct atl1c_adapter *adapter = netdev_priv(netdev);
 433         struct pci_dev *pdev = adapter->pdev;
 434         u32 mac_ctrl_data = 0;
 435
 436         if (netif_msg_pktdata(adapter))
 437                 dev_dbg(&pdev->dev, "atl1c_vlan_mode\n");
 438
 439         atl1c_irq_disable(adapter);
 440         AT_READ_REG(&adapter->hw, REG_MAC_CTRL, &mac_ctrl_data);
 441         __atl1c_vlan_mode(features, &mac_ctrl_data);
 442         AT_WRITE_REG(&adapter->hw, REG_MAC_CTRL, mac_ctrl_data);
 443         atl1c_irq_enable(adapter);
 444 }
 445
 446 static void atl1c_restore_vlan(struct atl1c_adapter *adapter)
 447 {
 448         struct pci_dev *pdev = adapter->pdev;
 449
 450         if (netif_msg_pktdata(adapter))
 451                 dev_dbg(&pdev->dev, "atl1c_restore_vlan\n");
 452         atl1c_vlan_mode(adapter->netdev, adapter->netdev->features);
 453 }
 454
 455 /**
 456  * atl1c_set_mac - Change the Ethernet Address of the NIC
 457  * @netdev: network interface device structure
 458  * @p: pointer to an address structure
 459  *
 460  * Returns 0 on success, negative on failure
 461  */
 462 static int atl1c_set_mac_addr(struct net_device *netdev, void *p)
 463 {
 464         struct atl1c_adapter *adapter = netdev_priv(netdev);
 465         struct sockaddr *addr = p;
 466
 467         if (!is_valid_ether_addr(addr->sa_data))
 468                 return -EADDRNOTAVAIL;
 469
 470         if (netif_running(netdev))
 471                 return -EBUSY;
 472
 473         memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
 474         memcpy(adapter->hw.mac_addr, addr->sa_data, netdev->addr_len);
 475         netdev->addr_assign_type &= ~NET_ADDR_RANDOM;
 476
 477         atl1c_hw_set_mac_addr(&adapter->hw, adapter->hw.mac_addr);
 478
 479         return 0;
 480 }
 481
 482 static void atl1c_set_rxbufsize(struct atl1c_adapter *adapter,
 483                                 struct net_device *dev)
 484 {
 485         int mtu = dev->mtu;
 486
 487         adapter->rx_buffer_len = mtu > AT_RX_BUF_SIZE ?
 488                 roundup(mtu + ETH_HLEN + ETH_FCS_LEN + VLAN_HLEN, 8) : AT_RX_BUF_SIZE;
 489 }
 490
 491 static netdev_features_t atl1c_fix_features(struct net_device *netdev,
 492         netdev_features_t features)
 493 {
 494         /*
 495          * Since there is no support for separate rx/tx vlan accel
 496          * enable/disable make sure tx flag is always in same state as rx.
 497          */
 498         if (features & NETIF_F_HW_VLAN_RX)
 499                 features |= NETIF_F_HW_VLAN_TX;
 500         else
 501                 features &= ~NETIF_F_HW_VLAN_TX;
 502
 503         if (netdev->mtu > MAX_TSO_FRAME_SIZE)
 504                 features &= ~(NETIF_F_TSO | NETIF_F_TSO6);
 505
 506         return features;
 507 }
 508
 509 static int atl1c_set_features(struct net_device *netdev,
 510         netdev_features_t features)
 511 {
 512         netdev_features_t changed = netdev->features ^ features;
 513
 514         if (changed & NETIF_F_HW_VLAN_RX)
 515                 atl1c_vlan_mode(netdev, features);
 516
 517         return 0;
 518 }
 519
 520 /**
 521  * atl1c_change_mtu - Change the Maximum Transfer Unit
 522  * @netdev: network interface device structure
 523  * @new_mtu: new value for maximum frame size
 524  *
 525  * Returns 0 on success, negative on failure
 526  */
 527 static int atl1c_change_mtu(struct net_device *netdev, int new_mtu)
 528 {
 529         struct atl1c_adapter *adapter = netdev_priv(netdev);
 530         struct atl1c_hw *hw = &adapter->hw;
 531         int old_mtu   = netdev->mtu;
 532         int max_frame = new_mtu + ETH_HLEN + ETH_FCS_LEN + VLAN_HLEN;
 533
 534         /* Fast Ethernet controller doesn't support jumbo packet */
 535         if (((hw->nic_type == athr_l2c ||
 536               hw->nic_type == athr_l2c_b ||
 537               hw->nic_type == athr_l2c_b2) && new_mtu > ETH_DATA_LEN) ||
 538               max_frame < ETH_ZLEN + ETH_FCS_LEN ||
 539               max_frame > MAX_JUMBO_FRAME_SIZE) {
 540                 if (netif_msg_link(adapter))
 541                         dev_warn(&adapter->pdev->dev, "invalid MTU setting\n");
 542                 return -EINVAL;
 543         }
 544         /* set MTU */
 545         if (old_mtu != new_mtu && netif_running(netdev)) {
 546                 while (test_and_set_bit(__AT_RESETTING, &adapter->flags))
 547                         msleep(1);
 548                 netdev->mtu = new_mtu;
 549                 adapter->hw.max_frame_size = new_mtu;
 550                 atl1c_set_rxbufsize(adapter, netdev);
 551                 atl1c_down(adapter);
 552                 netdev_update_features(netdev);
 553                 atl1c_up(adapter);
 554                 clear_bit(__AT_RESETTING, &adapter->flags);
 555         }
 556         return 0;
 557 }
 558
 559 /*
 560  *  caller should hold mdio_lock
 561  */
 562 static int atl1c_mdio_read(struct net_device *netdev, int phy_id, int reg_num)
 563 {
 564         struct atl1c_adapter *adapter = netdev_priv(netdev);
 565         u16 result;
 566
 567         atl1c_read_phy_reg(&adapter->hw, reg_num, &result);
 568         return result;
 569 }
 570
 571 static void atl1c_mdio_write(struct net_device *netdev, int phy_id,
 572                              int reg_num, int val)
 573 {
 574         struct atl1c_adapter *adapter = netdev_priv(netdev);
 575
 576         atl1c_write_phy_reg(&adapter->hw, reg_num, val);
 577 }
 578
 579 static int atl1c_mii_ioctl(struct net_device *netdev,
 580                            struct ifreq *ifr, int cmd)
 581 {
 582         struct atl1c_adapter *adapter = netdev_priv(netdev);
 583         struct pci_dev *pdev = adapter->pdev;
 584         struct mii_ioctl_data *data = if_mii(ifr);
 585         unsigned long flags;
 586         int retval = 0;
 587
 588         if (!netif_running(netdev))
 589                 return -EINVAL;
 590
 591         spin_lock_irqsave(&adapter->mdio_lock, flags);
 592         switch (cmd) {
 593         case SIOCGMIIPHY:
 594                 data->phy_id = 0;
 595                 break;
 596
 597         case SIOCGMIIREG:
 598                 if (atl1c_read_phy_reg(&adapter->hw, data->reg_num & 0x1F,
 599                                     &data->val_out)) {
 600                         retval = -EIO;
 601                         goto out;
 602                 }
 603                 break;
 604
 605         case SIOCSMIIREG:
 606                 if (data->reg_num & ~(0x1F)) {
 607                         retval = -EFAULT;
 608                         goto out;
 609                 }
 610
 611                 dev_dbg(&pdev->dev, "<atl1c_mii_ioctl> write %x %x",
 612                                 data->reg_num, data->val_in);
 613                 if (atl1c_write_phy_reg(&adapter->hw,
 614                                      data->reg_num, data->val_in)) {
 615                         retval = -EIO;
 616                         goto out;
 617                 }
 618                 break;
 619
 620         default:
 621                 retval = -EOPNOTSUPP;
 622                 break;
 623         }
 624 out:
 625         spin_unlock_irqrestore(&adapter->mdio_lock, flags);
 626         return retval;
 627 }
 628
 629 static int atl1c_ioctl(struct net_device *netdev, struct ifreq *ifr, int cmd)
 630 {
 631         switch (cmd) {
 632         case SIOCGMIIPHY:
 633         case SIOCGMIIREG:
 634         case SIOCSMIIREG:
 635                 return atl1c_mii_ioctl(netdev, ifr, cmd);
 636         default:
 637                 return -EOPNOTSUPP;
 638         }
 639 }
 640
 641 /**
 642  * atl1c_alloc_queues - Allocate memory for all rings
 643  * @adapter: board private structure to initialize
 644  *
 645  */
 646 static int atl1c_alloc_queues(struct atl1c_adapter *adapter)
 647 {
 648         return 0;
 649 }
 650
 651 static void atl1c_set_mac_type(struct atl1c_hw *hw)
 652 {
 653         switch (hw->device_id) {
 654         case PCI_DEVICE_ID_ATTANSIC_L2C:
 655                 hw->nic_type = athr_l2c;
 656                 break;
 657         case PCI_DEVICE_ID_ATTANSIC_L1C:
 658                 hw->nic_type = athr_l1c;
 659                 break;
 660         case PCI_DEVICE_ID_ATHEROS_L2C_B:
 661                 hw->nic_type = athr_l2c_b;
 662                 break;
 663         case PCI_DEVICE_ID_ATHEROS_L2C_B2:
 664                 hw->nic_type = athr_l2c_b2;
 665                 break;
 666         case PCI_DEVICE_ID_ATHEROS_L1D:
 667                 hw->nic_type = athr_l1d;
 668                 break;
 669         case PCI_DEVICE_ID_ATHEROS_L1D_2_0:
 670                 hw->nic_type = athr_l1d_2;
 671                 break;
 672         default:
 673                 break;
 674         }
 675 }
 676
 677 static int atl1c_setup_mac_funcs(struct atl1c_hw *hw)
 678 {
 679         u32 link_ctrl_data;
 680
 681         atl1c_set_mac_type(hw);
 682         AT_READ_REG(hw, REG_LINK_CTRL, &link_ctrl_data);
 683
 684         hw->ctrl_flags = ATL1C_INTR_MODRT_ENABLE  |
 685                          ATL1C_TXQ_MODE_ENHANCE;
 686         hw->ctrl_flags |= ATL1C_ASPM_L0S_SUPPORT |
 687                           ATL1C_ASPM_L1_SUPPORT;
 688         hw->ctrl_flags |= ATL1C_ASPM_CTRL_MON;
 689
 690         if (hw->nic_type == athr_l1c ||
 691             hw->nic_type == athr_l1d ||
 692             hw->nic_type == athr_l1d_2)
 693                 hw->link_cap_flags |= ATL1C_LINK_CAP_1000M;
 694         return 0;
 695 }
 696
 697 struct atl1c_platform_patch {
 698         u16 pci_did;
 699         u8  pci_revid;
 700         u16 subsystem_vid;
 701         u16 subsystem_did;
 702         u32 patch_flag;
 703 #define ATL1C_LINK_PATCH        0x1
 704 };
 705 static const struct atl1c_platform_patch plats[] = {
 706 {0x2060, 0xC1, 0x1019, 0x8152, 0x1},
 707 {0x2060, 0xC1, 0x1019, 0x2060, 0x1},
 708 {0x2060, 0xC1, 0x1019, 0xE000, 0x1},
 709 {0x2062, 0xC0, 0x1019, 0x8152, 0x1},
 710 {0x2062, 0xC0, 0x1019, 0x2062, 0x1},
 711 {0x2062, 0xC0, 0x1458, 0xE000, 0x1},
 712 {0x2062, 0xC1, 0x1019, 0x8152, 0x1},
 713 {0x2062, 0xC1, 0x1019, 0x2062, 0x1},
 714 {0x2062, 0xC1, 0x1458, 0xE000, 0x1},
 715 {0x2062, 0xC1, 0x1565, 0x2802, 0x1},
 716 {0x2062, 0xC1, 0x1565, 0x2801, 0x1},
 717 {0x1073, 0xC0, 0x1019, 0x8151, 0x1},
 718 {0x1073, 0xC0, 0x1019, 0x1073, 0x1},
 719 {0x1073, 0xC0, 0x1458, 0xE000, 0x1},
 720 {0x1083, 0xC0, 0x1458, 0xE000, 0x1},
 721 {0x1083, 0xC0, 0x1019, 0x8151, 0x1},
 722 {0x1083, 0xC0, 0x1019, 0x1083, 0x1},
 723 {0x1083, 0xC0, 0x1462, 0x7680, 0x1},
 724 {0x1083, 0xC0, 0x1565, 0x2803, 0x1},
 725 {0},
 726 };
 727
 728 static void atl1c_patch_assign(struct atl1c_hw *hw)
 729 {
 730         struct pci_dev  *pdev = hw->adapter->pdev;
 731         u32 misc_ctrl;
 732         int i = 0;
 733
 734         hw->msi_lnkpatch = false;
 735
 736         while (plats[i].pci_did != 0) {
 737                 if (plats[i].pci_did == hw->device_id &&
 738                     plats[i].pci_revid == hw->revision_id &&
 739                     plats[i].subsystem_vid == hw->subsystem_vendor_id &&
 740                     plats[i].subsystem_did == hw->subsystem_id) {
 741                         if (plats[i].patch_flag & ATL1C_LINK_PATCH)
 742                                 hw->msi_lnkpatch = true;
 743                 }
 744                 i++;
 745         }
 746
 747         if (hw->device_id == PCI_DEVICE_ID_ATHEROS_L2C_B2 &&
 748             hw->revision_id == L2CB_V21) {
 749                 /* config acess mode */
 750                 pci_write_config_dword(pdev, REG_PCIE_IND_ACC_ADDR,
 751                                        REG_PCIE_DEV_MISC_CTRL);
 752                 pci_read_config_dword(pdev, REG_PCIE_IND_ACC_DATA, &misc_ctrl);
 753                 misc_ctrl &= ~0x100;
 754                 pci_write_config_dword(pdev, REG_PCIE_IND_ACC_ADDR,
 755                                        REG_PCIE_DEV_MISC_CTRL);
 756                 pci_write_config_dword(pdev, REG_PCIE_IND_ACC_DATA, misc_ctrl);
 757         }
 758 }
 759 /**
 760  * atl1c_sw_init - Initialize general software structures (struct atl1c_adapter)
 761  * @adapter: board private structure to initialize
 762  *
 763  * atl1c_sw_init initializes the Adapter private data structure.
 764  * Fields are initialized based on PCI device information and
 765  * OS network device settings (MTU size).
 766  */
 767 static int atl1c_sw_init(struct atl1c_adapter *adapter)
 768 {
 769         struct atl1c_hw *hw   = &adapter->hw;
 770         struct pci_dev  *pdev = adapter->pdev;
 771         u32 revision;
 772
 773
 774         adapter->wol = 0;
 775         device_set_wakeup_enable(&pdev->dev, false);
 776         adapter->link_speed = SPEED_0;
 777         adapter->link_duplex = FULL_DUPLEX;
 778         adapter->tpd_ring[0].count = 1024;
 779         adapter->rfd_ring.count = 512;
 780
 781         hw->vendor_id = pdev->vendor;
 782         hw->device_id = pdev->device;
 783         hw->subsystem_vendor_id = pdev->subsystem_vendor;
 784         hw->subsystem_id = pdev->subsystem_device;
 785         pci_read_config_dword(pdev, PCI_CLASS_REVISION, &revision);
 786         hw->revision_id = revision & 0xFF;
 787         /* before link up, we assume hibernate is true */
 788         hw->hibernate = true;
 789         hw->media_type = MEDIA_TYPE_AUTO_SENSOR;
 790         if (atl1c_setup_mac_funcs(hw) != 0) {
 791                 dev_err(&pdev->dev, "set mac function pointers failed\n");
 792                 return -1;
 793         }
 794         atl1c_patch_assign(hw);
 795
 796         hw->intr_mask = IMR_NORMAL_MASK;
 797         hw->phy_configured = false;
 798         hw->preamble_len = 7;
 799         hw->max_frame_size = adapter->netdev->mtu;
 800         hw->autoneg_advertised = ADVERTISED_Autoneg;
 801         hw->indirect_tab = 0xE4E4E4E4;
 802         hw->base_cpu = 0;
 803
 804         hw->ict = 50000;                /* 100ms */
 805         hw->smb_timer = 200000;         /* 400ms */
 806         hw->rx_imt = 200;
 807         hw->tx_imt = 1000;
 808
 809         hw->tpd_burst = 5;
 810         hw->rfd_burst = 8;
 811         hw->dma_order = atl1c_dma_ord_out;
 812         hw->dmar_block = atl1c_dma_req_1024;
 813
 814         if (atl1c_alloc_queues(adapter)) {
 815                 dev_err(&pdev->dev, "Unable to allocate memory for queues\n");
 816                 return -ENOMEM;
 817         }
 818         /* TODO */
 819         atl1c_set_rxbufsize(adapter, adapter->netdev);
 820         atomic_set(&adapter->irq_sem, 1);
 821         spin_lock_init(&adapter->mdio_lock);
 822         spin_lock_init(&adapter->tx_lock);
 823         set_bit(__AT_DOWN, &adapter->flags);
 824
 825         return 0;
 826 }
 827
 828 static inline void atl1c_clean_buffer(struct pci_dev *pdev,
 829                                 struct atl1c_buffer *buffer_info, int in_irq)
 830 {
 831         u16 pci_driection;
 832         if (buffer_info->flags & ATL1C_BUFFER_FREE)
 833                 return;
 834         if (buffer_info->dma) {
 835                 if (buffer_info->flags & ATL1C_PCIMAP_FROMDEVICE)
 836                         pci_driection = PCI_DMA_FROMDEVICE;
 837                 else
 838                         pci_driection = PCI_DMA_TODEVICE;
 839
 840                 if (buffer_info->flags & ATL1C_PCIMAP_SINGLE)
 841                         pci_unmap_single(pdev, buffer_info->dma,
 842                                         buffer_info->length, pci_driection);
 843                 else if (buffer_info->flags & ATL1C_PCIMAP_PAGE)
 844                         pci_unmap_page(pdev, buffer_info->dma,
 845                                         buffer_info->length, pci_driection);
 846         }
 847         if (buffer_info->skb) {
 848                 if (in_irq)
 849                         dev_kfree_skb_irq(buffer_info->skb);
 850                 else
 851                         dev_kfree_skb(buffer_info->skb);
 852         }
 853         buffer_info->dma = 0;
 854         buffer_info->skb = NULL;
 855         ATL1C_SET_BUFFER_STATE(buffer_info, ATL1C_BUFFER_FREE);
 856 }
 857 /**
 858  * atl1c_clean_tx_ring - Free Tx-skb
 859  * @adapter: board private structure
 860  */
 861 static void atl1c_clean_tx_ring(struct atl1c_adapter *adapter,
 862                                 enum atl1c_trans_queue type)
 863 {
 864         struct atl1c_tpd_ring *tpd_ring = &adapter->tpd_ring[type];
 865         struct atl1c_buffer *buffer_info;
 866         struct pci_dev *pdev = adapter->pdev;
 867         u16 index, ring_count;
 868
 869         ring_count = tpd_ring->count;
 870         for (index = 0; index < ring_count; index++) {
 871                 buffer_info = &tpd_ring->buffer_info[index];
 872                 atl1c_clean_buffer(pdev, buffer_info, 0);
 873         }
 874
 875         /* Zero out Tx-buffers */
 876         memset(tpd_ring->desc, 0, sizeof(struct atl1c_tpd_desc) *
 877                 ring_count);
 878         atomic_set(&tpd_ring->next_to_clean, 0);
 879         tpd_ring->next_to_use = 0;
 880 }
 881
 882 /**
 883  * atl1c_clean_rx_ring - Free rx-reservation skbs
 884  * @adapter: board private structure
 885  */
 886 static void atl1c_clean_rx_ring(struct atl1c_adapter *adapter)
 887 {
 888         struct atl1c_rfd_ring *rfd_ring = &adapter->rfd_ring;
 889         struct atl1c_rrd_ring *rrd_ring = &adapter->rrd_ring;
 890         struct atl1c_buffer *buffer_info;
 891         struct pci_dev *pdev = adapter->pdev;
 892         int j;
 893
 894         for (j = 0; j < rfd_ring->count; j++) {
 895                 buffer_info = &rfd_ring->buffer_info[j];
 896                 atl1c_clean_buffer(pdev, buffer_info, 0);
 897         }
 898         /* zero out the descriptor ring */
 899         memset(rfd_ring->desc, 0, rfd_ring->size);
 900         rfd_ring->next_to_clean = 0;
 901         rfd_ring->next_to_use = 0;
 902         rrd_ring->next_to_use = 0;
 903         rrd_ring->next_to_clean = 0;
 904 }
 905
 906 /*
 907  * Read / Write Ptr Initialize:
 908  */
 909 static void atl1c_init_ring_ptrs(struct atl1c_adapter *adapter)
 910 {
 911         struct atl1c_tpd_ring *tpd_ring = adapter->tpd_ring;
 912         struct atl1c_rfd_ring *rfd_ring = &adapter->rfd_ring;
 913         struct atl1c_rrd_ring *rrd_ring = &adapter->rrd_ring;
 914         struct atl1c_buffer *buffer_info;
 915         int i, j;
 916
 917         for (i = 0; i < AT_MAX_TRANSMIT_QUEUE; i++) {
 918                 tpd_ring[i].next_to_use = 0;
 919                 atomic_set(&tpd_ring[i].next_to_clean, 0);
 920                 buffer_info = tpd_ring[i].buffer_info;
 921                 for (j = 0; j < tpd_ring->count; j++)
 922                         ATL1C_SET_BUFFER_STATE(&buffer_info[i],
 923                                         ATL1C_BUFFER_FREE);
 924         }
 925         rfd_ring->next_to_use = 0;
 926         rfd_ring->next_to_clean = 0;
 927         rrd_ring->next_to_use = 0;
 928         rrd_ring->next_to_clean = 0;
 929         for (j = 0; j < rfd_ring->count; j++) {
 930                 buffer_info = &rfd_ring->buffer_info[j];
 931                 ATL1C_SET_BUFFER_STATE(buffer_info, ATL1C_BUFFER_FREE);
 932         }
 933 }
 934
 935 /**
 936  * atl1c_free_ring_resources - Free Tx / RX descriptor Resources
 937  * @adapter: board private structure
 938  *
 939  * Free all transmit software resources
 940  */
 941 static void atl1c_free_ring_resources(struct atl1c_adapter *adapter)
 942 {
 943         struct pci_dev *pdev = adapter->pdev;
 944
 945         pci_free_consistent(pdev, adapter->ring_header.size,
 946                                         adapter->ring_header.desc,
 947                                         adapter->ring_header.dma);
 948         adapter->ring_header.desc = NULL;
 949
 950         /* Note: just free tdp_ring.buffer_info,
 951         *  it contain rfd_ring.buffer_info, do not double free */
 952         if (adapter->tpd_ring[0].buffer_info) {
 953                 kfree(adapter->tpd_ring[0].buffer_info);
 954                 adapter->tpd_ring[0].buffer_info = NULL;
 955         }
 956 }
 957
 958 /**
 959  * atl1c_setup_mem_resources - allocate Tx / RX descriptor resources
 960  * @adapter: board private structure
 961  *
 962  * Return 0 on success, negative on failure
 963  */
 964 static int atl1c_setup_ring_resources(struct atl1c_adapter *adapter)
 965 {
 966         struct pci_dev *pdev = adapter->pdev;
 967         struct atl1c_tpd_ring *tpd_ring = adapter->tpd_ring;
 968         struct atl1c_rfd_ring *rfd_ring = &adapter->rfd_ring;
 969         struct atl1c_rrd_ring *rrd_ring = &adapter->rrd_ring;
 970         struct atl1c_ring_header *ring_header = &adapter->ring_header;
 971         int size;
 972         int i;
 973         int count = 0;
 974         int rx_desc_count = 0;
 975         u32 offset = 0;
 976
 977         rrd_ring->count = rfd_ring->count;
 978         for (i = 1; i < AT_MAX_TRANSMIT_QUEUE; i++)
 979                 tpd_ring[i].count = tpd_ring[0].count;
 980
 981         /* 2 tpd queue, one high priority queue,
 982          * another normal priority queue */
 983         size = sizeof(struct atl1c_buffer) * (tpd_ring->count * 2 +
 984                 rfd_ring->count);
 985         tpd_ring->buffer_info = kzalloc(size, GFP_KERNEL);
 986         if (unlikely(!tpd_ring->buffer_info)) {
 987                 dev_err(&pdev->dev, "kzalloc failed, size = %d\n",
 988                         size);
 989                 goto err_nomem;
 990         }
 991         for (i = 0; i < AT_MAX_TRANSMIT_QUEUE; i++) {
 992                 tpd_ring[i].buffer_info =
 993                         (tpd_ring->buffer_info + count);
 994                 count += tpd_ring[i].count;
 995         }
 996
 997         rfd_ring->buffer_info =
 998                 (tpd_ring->buffer_info + count);
 999         count += rfd_ring->count;
1000         rx_desc_count += rfd_ring->count;
1001
1002         /*
1003          * real ring DMA buffer
1004          * each ring/block may need up to 8 bytes for alignment, hence the
1005          * additional bytes tacked onto the end.
1006          */
1007         ring_header->size = size =
1008                 sizeof(struct atl1c_tpd_desc) * tpd_ring->count * 2 +
1009                 sizeof(struct atl1c_rx_free_desc) * rx_desc_count +
1010                 sizeof(struct atl1c_recv_ret_status) * rx_desc_count +
1011                 8 * 4;
1012
1013         ring_header->desc = pci_alloc_consistent(pdev, ring_header->size,
1014                                 &ring_header->dma);
1015         if (unlikely(!ring_header->desc)) {
1016                 dev_err(&pdev->dev, "pci_alloc_consistend failed\n");
1017                 goto err_nomem;
1018         }
1019         memset(ring_header->desc, 0, ring_header->size);
1020         /* init TPD ring */
1021
1022         tpd_ring[0].dma = roundup(ring_header->dma, 8);
1023         offset = tpd_ring[0].dma - ring_header->dma;
1024         for (i = 0; i < AT_MAX_TRANSMIT_QUEUE; i++) {
1025                 tpd_ring[i].dma = ring_header->dma + offset;
1026                 tpd_ring[i].desc = (u8 *) ring_header->desc + offset;
1027                 tpd_ring[i].size =
1028                         sizeof(struct atl1c_tpd_desc) * tpd_ring[i].count;
1029                 offset += roundup(tpd_ring[i].size, 8);
1030         }
1031         /* init RFD ring */
1032         rfd_ring->dma = ring_header->dma + offset;
1033         rfd_ring->desc = (u8 *) ring_header->desc + offset;
1034         rfd_ring->size = sizeof(struct atl1c_rx_free_desc) * rfd_ring->count;
1035         offset += roundup(rfd_ring->size, 8);
1036
1037         /* init RRD ring */
1038         rrd_ring->dma = ring_header->dma + offset;
1039         rrd_ring->desc = (u8 *) ring_header->desc + offset;
1040         rrd_ring->size = sizeof(struct atl1c_recv_ret_status) *
1041                 rrd_ring->count;
1042         offset += roundup(rrd_ring->size, 8);
1043
1044         return 0;
1045
1046 err_nomem:
1047         kfree(tpd_ring->buffer_info);
1048         return -ENOMEM;
1049 }
1050
1051 static void atl1c_configure_des_ring(struct atl1c_adapter *adapter)
1052 {
1053         struct atl1c_hw *hw = &adapter->hw;
1054         struct atl1c_rfd_ring *rfd_ring = &adapter->rfd_ring;
1055         struct atl1c_rrd_ring *rrd_ring = &adapter->rrd_ring;
1056         struct atl1c_tpd_ring *tpd_ring = (struct atl1c_tpd_ring *)
1057                                 adapter->tpd_ring;
1058
1059         /* TPD */
1060         AT_WRITE_REG(hw, REG_TX_BASE_ADDR_HI,
1061                         (u32)((tpd_ring[atl1c_trans_normal].dma &
1062                                 AT_DMA_HI_ADDR_MASK) >> 32));
1063         /* just enable normal priority TX queue */
1064         AT_WRITE_REG(hw, REG_TPD_PRI0_ADDR_LO,
1065                         (u32)(tpd_ring[atl1c_trans_normal].dma &
1066                                 AT_DMA_LO_ADDR_MASK));
1067         AT_WRITE_REG(hw, REG_TPD_PRI1_ADDR_LO,
1068                         (u32)(tpd_ring[atl1c_trans_high].dma &
1069                                 AT_DMA_LO_ADDR_MASK));
1070         AT_WRITE_REG(hw, REG_TPD_RING_SIZE,
1071                         (u32)(tpd_ring[0].count & TPD_RING_SIZE_MASK));
1072
1073
1074         /* RFD */
1075         AT_WRITE_REG(hw, REG_RX_BASE_ADDR_HI,
1076                         (u32)((rfd_ring->dma & AT_DMA_HI_ADDR_MASK) >> 32));
1077         AT_WRITE_REG(hw, REG_RFD0_HEAD_ADDR_LO,
1078                         (u32)(rfd_ring->dma & AT_DMA_LO_ADDR_MASK));
1079
1080         AT_WRITE_REG(hw, REG_RFD_RING_SIZE,
1081                         rfd_ring->count & RFD_RING_SIZE_MASK);
1082         AT_WRITE_REG(hw, REG_RX_BUF_SIZE,
1083                         adapter->rx_buffer_len & RX_BUF_SIZE_MASK);
1084
1085         /* RRD */
1086         AT_WRITE_REG(hw, REG_RRD0_HEAD_ADDR_LO,
1087                         (u32)(rrd_ring->dma & AT_DMA_LO_ADDR_MASK));
1088         AT_WRITE_REG(hw, REG_RRD_RING_SIZE,
1089                         (rrd_ring->count & RRD_RING_SIZE_MASK));
1090
1091         if (hw->nic_type == athr_l2c_b) {
1092                 AT_WRITE_REG(hw, REG_SRAM_RXF_LEN, 0x02a0L);
1093                 AT_WRITE_REG(hw, REG_SRAM_TXF_LEN, 0x0100L);
1094                 AT_WRITE_REG(hw, REG_SRAM_RXF_ADDR, 0x029f0000L);
1095                 AT_WRITE_REG(hw, REG_SRAM_RFD0_INFO, 0x02bf02a0L);
1096                 AT_WRITE_REG(hw, REG_SRAM_TXF_ADDR, 0x03bf02c0L);
1097                 AT_WRITE_REG(hw, REG_SRAM_TRD_ADDR, 0x03df03c0L);
1098                 AT_WRITE_REG(hw, REG_TXF_WATER_MARK, 0);        /* TX watermark, to enter l1 state.*/
1099                 AT_WRITE_REG(hw, REG_RXD_DMA_CTRL, 0);          /* RXD threshold.*/
1100         }
1101         /* Load all of base address above */
1102         AT_WRITE_REG(hw, REG_LOAD_PTR, 1);
1103 }
1104
1105 static void atl1c_configure_tx(struct atl1c_adapter *adapter)
1106 {
1107         struct atl1c_hw *hw = &adapter->hw;
1108         int max_pay_load;
1109         u16 tx_offload_thresh;
1110         u32 txq_ctrl_data;
1111
1112         tx_offload_thresh = MAX_TSO_FRAME_SIZE;
1113         AT_WRITE_REG(hw, REG_TX_TSO_OFFLOAD_THRESH,
1114                 (tx_offload_thresh >> 3) & TX_TSO_OFFLOAD_THRESH_MASK);
1115         max_pay_load = pcie_get_readrq(adapter->pdev) >> 8;
1116         hw->dmar_block = min_t(u32, max_pay_load, hw->dmar_block);
1117         /*
1118          * if BIOS had changed the dam-read-max-length to an invalid value,
1119          * restore it to default value
1120          */
1121         if (hw->dmar_block < DEVICE_CTRL_MAXRRS_MIN) {
1122                 pcie_set_readrq(adapter->pdev, 128 << DEVICE_CTRL_MAXRRS_MIN);
1123                 hw->dmar_block = DEVICE_CTRL_MAXRRS_MIN;
1124         }
1125         txq_ctrl_data =
1126                 hw->nic_type == athr_l2c_b || hw->nic_type == athr_l2c_b2 ?
1127                 L2CB_TXQ_CFGV : L1C_TXQ_CFGV;
1128
1129         AT_WRITE_REG(hw, REG_TXQ_CTRL, txq_ctrl_data);
1130 }
1131
1132 static void atl1c_configure_rx(struct atl1c_adapter *adapter)
1133 {
1134         struct atl1c_hw *hw = &adapter->hw;
1135         u32 rxq_ctrl_data;
1136
1137         rxq_ctrl_data = (hw->rfd_burst & RXQ_RFD_BURST_NUM_MASK) <<
1138                         RXQ_RFD_BURST_NUM_SHIFT;
1139
1140         if (hw->ctrl_flags & ATL1C_RX_IPV6_CHKSUM)
1141                 rxq_ctrl_data |= IPV6_CHKSUM_CTRL_EN;
1142
1143         /* aspm for gigabit */
1144         if (hw->nic_type != athr_l1d_2 && (hw->device_id & 1) != 0)
1145                 rxq_ctrl_data = FIELD_SETX(rxq_ctrl_data, ASPM_THRUPUT_LIMIT,
1146                         ASPM_THRUPUT_LIMIT_100M);
1147
1148         AT_WRITE_REG(hw, REG_RXQ_CTRL, rxq_ctrl_data);
1149 }
1150
1151 static void atl1c_configure_dma(struct atl1c_adapter *adapter)
1152 {
1153         struct atl1c_hw *hw = &adapter->hw;
1154         u32 dma_ctrl_data;
1155
1156         dma_ctrl_data = FIELDX(DMA_CTRL_RORDER_MODE, DMA_CTRL_RORDER_MODE_OUT) |
1157                 DMA_CTRL_RREQ_PRI_DATA |
1158                 FIELDX(DMA_CTRL_RREQ_BLEN, hw->dmar_block) |
1159                 FIELDX(DMA_CTRL_WDLY_CNT, DMA_CTRL_WDLY_CNT_DEF) |
1160                 FIELDX(DMA_CTRL_RDLY_CNT, DMA_CTRL_RDLY_CNT_DEF);
1161
1162         AT_WRITE_REG(hw, REG_DMA_CTRL, dma_ctrl_data);
1163 }
1164
1165 /*
1166  * Stop the mac, transmit and receive units
1167  * hw - Struct containing variables accessed by shared code
1168  * return : 0  or  idle status (if error)
1169  */
1170 static int atl1c_stop_mac(struct atl1c_hw *hw)
1171 {
1172         u32 data;
1173
1174         AT_READ_REG(hw, REG_RXQ_CTRL, &data);
1175         data &= ~RXQ_CTRL_EN;
1176         AT_WRITE_REG(hw, REG_RXQ_CTRL, data);
1177
1178         AT_READ_REG(hw, REG_TXQ_CTRL, &data);
1179         data &= ~TXQ_CTRL_EN;
1180         AT_WRITE_REG(hw, REG_TXQ_CTRL, data);
1181
1182         atl1c_wait_until_idle(hw, IDLE_STATUS_RXQ_BUSY | IDLE_STATUS_TXQ_BUSY);
1183
1184         AT_READ_REG(hw, REG_MAC_CTRL, &data);
1185         data &= ~(MAC_CTRL_TX_EN | MAC_CTRL_RX_EN);
1186         AT_WRITE_REG(hw, REG_MAC_CTRL, data);
1187
1188         return (int)atl1c_wait_until_idle(hw,
1189                 IDLE_STATUS_TXMAC_BUSY | IDLE_STATUS_RXMAC_BUSY);
1190 }
1191
1192 static void atl1c_start_mac(struct atl1c_adapter *adapter)
1193 {
1194         struct atl1c_hw *hw = &adapter->hw;
1195         u32 mac, txq, rxq;
1196
1197         hw->mac_duplex = adapter->link_duplex == FULL_DUPLEX ? true : false;
1198         hw->mac_speed = adapter->link_speed == SPEED_1000 ?
1199                 atl1c_mac_speed_1000 : atl1c_mac_speed_10_100;
1200
1201         AT_READ_REG(hw, REG_TXQ_CTRL, &txq);
1202         AT_READ_REG(hw, REG_RXQ_CTRL, &rxq);
1203         AT_READ_REG(hw, REG_MAC_CTRL, &mac);
1204
1205         txq |= TXQ_CTRL_EN;
1206         rxq |= RXQ_CTRL_EN;
1207         mac |= MAC_CTRL_TX_EN | MAC_CTRL_TX_FLOW |
1208                MAC_CTRL_RX_EN | MAC_CTRL_RX_FLOW |
1209                MAC_CTRL_ADD_CRC | MAC_CTRL_PAD |
1210                MAC_CTRL_BC_EN | MAC_CTRL_SINGLE_PAUSE_EN |
1211                MAC_CTRL_HASH_ALG_CRC32;
1212         if (hw->mac_duplex)
1213                 mac |= MAC_CTRL_DUPLX;
1214         else
1215                 mac &= ~MAC_CTRL_DUPLX;
1216         mac = FIELD_SETX(mac, MAC_CTRL_SPEED, hw->mac_speed);
1217         mac = FIELD_SETX(mac, MAC_CTRL_PRMLEN, hw->preamble_len);
1218
1219         AT_WRITE_REG(hw, REG_TXQ_CTRL, txq);
1220         AT_WRITE_REG(hw, REG_RXQ_CTRL, rxq);
1221         AT_WRITE_REG(hw, REG_MAC_CTRL, mac);
1222 }
1223
1224 /*
1225  * Reset the transmit and receive units; mask and clear all interrupts.
1226  * hw - Struct containing variables accessed by shared code
1227  * return : 0  or  idle status (if error)
1228  */
1229 static int atl1c_reset_mac(struct atl1c_hw *hw)
1230 {
1231         struct atl1c_adapter *adapter = hw->adapter;
1232         struct pci_dev *pdev = adapter->pdev;
1233         u32 ctrl_data = 0;
1234
1235         atl1c_stop_mac(hw);
1236         /*
1237          * Issue Soft Reset to the MAC.  This will reset the chip's
1238          * transmit, receive, DMA.  It will not effect
1239          * the current PCI configuration.  The global reset bit is self-
1240          * clearing, and should clear within a microsecond.
1241          */
1242         AT_READ_REG(hw, REG_MASTER_CTRL, &ctrl_data);
1243         ctrl_data |= MASTER_CTRL_OOB_DIS;
1244         AT_WRITE_REG(hw, REG_MASTER_CTRL, ctrl_data | MASTER_CTRL_SOFT_RST);
1245
1246         AT_WRITE_FLUSH(hw);
1247         msleep(10);
1248         /* Wait at least 10ms for All module to be Idle */
1249
1250         if (atl1c_wait_until_idle(hw, IDLE_STATUS_MASK)) {
1251                 dev_err(&pdev->dev,
1252                         "MAC state machine can't be idle since"
1253                         " disabled for 10ms second\n");
1254                 return -1;
1255         }
1256         AT_WRITE_REG(hw, REG_MASTER_CTRL, ctrl_data);
1257
1258         /* driver control speed/duplex */
1259         AT_READ_REG(hw, REG_MAC_CTRL, &ctrl_data);
1260         AT_WRITE_REG(hw, REG_MAC_CTRL, ctrl_data | MAC_CTRL_SPEED_MODE_SW);
1261
1262         /* clk switch setting */
1263         AT_READ_REG(hw, REG_SERDES, &ctrl_data);
1264         switch (hw->nic_type) {
1265         case athr_l2c_b:
1266                 ctrl_data &= ~(SERDES_PHY_CLK_SLOWDOWN |
1267                                 SERDES_MAC_CLK_SLOWDOWN);
1268                 AT_WRITE_REG(hw, REG_SERDES, ctrl_data);
1269                 break;
1270         case athr_l2c_b2:
1271         case athr_l1d_2:
1272                 ctrl_data |= SERDES_PHY_CLK_SLOWDOWN | SERDES_MAC_CLK_SLOWDOWN;
1273                 AT_WRITE_REG(hw, REG_SERDES, ctrl_data);
1274                 break;
1275         default:
1276                 break;
1277         }
1278
1279         return 0;
1280 }
1281
1282 static void atl1c_disable_l0s_l1(struct atl1c_hw *hw)
1283 {
1284         u16 ctrl_flags = hw->ctrl_flags;
1285
1286         hw->ctrl_flags &= ~(ATL1C_ASPM_L0S_SUPPORT | ATL1C_ASPM_L1_SUPPORT);
1287         atl1c_set_aspm(hw, SPEED_0);
1288         hw->ctrl_flags = ctrl_flags;
1289 }
1290
1291 /*
1292  * Set ASPM state.
1293  * Enable/disable L0s/L1 depend on link state.
1294  */
1295 static void atl1c_set_aspm(struct atl1c_hw *hw, u16 link_speed)
1296 {
1297         u32 pm_ctrl_data;
1298         u32 link_l1_timer;
1299
1300         AT_READ_REG(hw, REG_PM_CTRL, &pm_ctrl_data);
1301         pm_ctrl_data &= ~(PM_CTRL_ASPM_L1_EN |
1302                           PM_CTRL_ASPM_L0S_EN |
1303                           PM_CTRL_MAC_ASPM_CHK);
1304         /* L1 timer */
1305         if (hw->nic_type == athr_l2c_b2 || hw->nic_type == athr_l1d_2) {
1306                 pm_ctrl_data &= ~PMCTRL_TXL1_AFTER_L0S;
1307                 link_l1_timer =
1308                         link_speed == SPEED_1000 || link_speed == SPEED_100 ?
1309                         L1D_PMCTRL_L1_ENTRY_TM_16US : 1;
1310                 pm_ctrl_data = FIELD_SETX(pm_ctrl_data,
1311                         L1D_PMCTRL_L1_ENTRY_TM, link_l1_timer);
1312         } else {
1313                 link_l1_timer = hw->nic_type == athr_l2c_b ?
1314                         L2CB1_PM_CTRL_L1_ENTRY_TM : L1C_PM_CTRL_L1_ENTRY_TM;
1315                 if (link_speed != SPEED_1000 && link_speed != SPEED_100)
1316                         link_l1_timer = 1;
1317                 pm_ctrl_data = FIELD_SETX(pm_ctrl_data,
1318                         PM_CTRL_L1_ENTRY_TIMER, link_l1_timer);
1319         }
1320
1321         /* L0S/L1 enable */
1322         if ((hw->ctrl_flags & ATL1C_ASPM_L0S_SUPPORT) && link_speed != SPEED_0)
1323                 pm_ctrl_data |= PM_CTRL_ASPM_L0S_EN | PM_CTRL_MAC_ASPM_CHK;
1324         if (hw->ctrl_flags & ATL1C_ASPM_L1_SUPPORT)
1325                 pm_ctrl_data |= PM_CTRL_ASPM_L1_EN | PM_CTRL_MAC_ASPM_CHK;
1326
1327         /* l2cb & l1d & l2cb2 & l1d2 */
1328         if (hw->nic_type == athr_l2c_b || hw->nic_type == athr_l1d ||
1329             hw->nic_type == athr_l2c_b2 || hw->nic_type == athr_l1d_2) {
1330                 pm_ctrl_data = FIELD_SETX(pm_ctrl_data,
1331                         PM_CTRL_PM_REQ_TIMER, PM_CTRL_PM_REQ_TO_DEF);
1332                 pm_ctrl_data |= PM_CTRL_RCVR_WT_TIMER |
1333                                 PM_CTRL_SERDES_PD_EX_L1 |
1334                                 PM_CTRL_CLK_SWH_L1;
1335                 pm_ctrl_data &= ~(PM_CTRL_SERDES_L1_EN |
1336                                   PM_CTRL_SERDES_PLL_L1_EN |
1337                                   PM_CTRL_SERDES_BUFS_RX_L1_EN |
1338                                   PM_CTRL_SA_DLY_EN |
1339                                   PM_CTRL_HOTRST);
1340                 /* disable l0s if link down or l2cb */
1341                 if (link_speed == SPEED_0 || hw->nic_type == athr_l2c_b)
1342                         pm_ctrl_data &= ~PM_CTRL_ASPM_L0S_EN;
1343         } else { /* l1c */
1344                 pm_ctrl_data =
1345                         FIELD_SETX(pm_ctrl_data, PM_CTRL_L1_ENTRY_TIMER, 0);
1346                 if (link_speed != SPEED_0) {
1347                         pm_ctrl_data |= PM_CTRL_SERDES_L1_EN |
1348                                         PM_CTRL_SERDES_PLL_L1_EN |
1349                                         PM_CTRL_SERDES_BUFS_RX_L1_EN;
1350                         pm_ctrl_data &= ~(PM_CTRL_SERDES_PD_EX_L1 |
1351                                           PM_CTRL_CLK_SWH_L1 |
1352                                           PM_CTRL_ASPM_L0S_EN |
1353                                           PM_CTRL_ASPM_L1_EN);
1354                 } else { /* link down */
1355                         pm_ctrl_data |= PM_CTRL_CLK_SWH_L1;
1356                         pm_ctrl_data &= ~(PM_CTRL_SERDES_L1_EN |
1357                                           PM_CTRL_SERDES_PLL_L1_EN |
1358                                           PM_CTRL_SERDES_BUFS_RX_L1_EN |
1359                                           PM_CTRL_ASPM_L0S_EN);
1360                 }
1361         }
1362         AT_WRITE_REG(hw, REG_PM_CTRL, pm_ctrl_data);
1363
1364         return;
1365 }
1366
1367 /**
1368  * atl1c_configure - Configure Transmit&Receive Unit after Reset
1369  * @adapter: board private structure
1370  *
1371  * Configure the Tx /Rx unit of the MAC after a reset.
1372  */
1373 static int atl1c_configure_mac(struct atl1c_adapter *adapter)
1374 {
1375         struct atl1c_hw *hw = &adapter->hw;
1376         u32 master_ctrl_data = 0;
1377         u32 intr_modrt_data;
1378         u32 data;
1379
1380         AT_READ_REG(hw, REG_MASTER_CTRL, &master_ctrl_data);
1381         master_ctrl_data &= ~(MASTER_CTRL_TX_ITIMER_EN |
1382                               MASTER_CTRL_RX_ITIMER_EN |
1383                               MASTER_CTRL_INT_RDCLR);
1384         /* clear interrupt status */
1385         AT_WRITE_REG(hw, REG_ISR, 0xFFFFFFFF);
1386         /*  Clear any WOL status */
1387         AT_WRITE_REG(hw, REG_WOL_CTRL, 0);
1388         /* set Interrupt Clear Timer
1389          * HW will enable self to assert interrupt event to system after
1390          * waiting x-time for software to notify it accept interrupt.
1391          */
1392
1393         data = CLK_GATING_EN_ALL;
1394         if (hw->ctrl_flags & ATL1C_CLK_GATING_EN) {
1395                 if (hw->nic_type == athr_l2c_b)
1396                         data &= ~CLK_GATING_RXMAC_EN;
1397         } else
1398                 data = 0;
1399         AT_WRITE_REG(hw, REG_CLK_GATING_CTRL, data);
1400
1401         AT_WRITE_REG(hw, REG_INT_RETRIG_TIMER,
1402                 hw->ict & INT_RETRIG_TIMER_MASK);
1403
1404         atl1c_configure_des_ring(adapter);
1405
1406         if (hw->ctrl_flags & ATL1C_INTR_MODRT_ENABLE) {
1407                 intr_modrt_data = (hw->tx_imt & IRQ_MODRT_TIMER_MASK) <<
1408                                         IRQ_MODRT_TX_TIMER_SHIFT;
1409                 intr_modrt_data |= (hw->rx_imt & IRQ_MODRT_TIMER_MASK) <<
1410                                         IRQ_MODRT_RX_TIMER_SHIFT;
1411                 AT_WRITE_REG(hw, REG_IRQ_MODRT_TIMER_INIT, intr_modrt_data);
1412                 master_ctrl_data |=
1413                         MASTER_CTRL_TX_ITIMER_EN | MASTER_CTRL_RX_ITIMER_EN;
1414         }
1415
1416         if (hw->ctrl_flags & ATL1C_INTR_CLEAR_ON_READ)
1417                 master_ctrl_data |= MASTER_CTRL_INT_RDCLR;
1418
1419         master_ctrl_data |= MASTER_CTRL_SA_TIMER_EN;
1420         AT_WRITE_REG(hw, REG_MASTER_CTRL, master_ctrl_data);
1421
1422         AT_WRITE_REG(hw, REG_SMB_STAT_TIMER,
1423                 hw->smb_timer & SMB_STAT_TIMER_MASK);
1424
1425         /* set MTU */
1426         AT_WRITE_REG(hw, REG_MTU, hw->max_frame_size + ETH_HLEN +
1427                         VLAN_HLEN + ETH_FCS_LEN);
1428
1429         atl1c_configure_tx(adapter);
1430         atl1c_configure_rx(adapter);
1431         atl1c_configure_dma(adapter);
1432
1433         return 0;
1434 }
1435
1436 static int atl1c_configure(struct atl1c_adapter *adapter)
1437 {
1438         struct net_device *netdev = adapter->netdev;
1439         int num;
1440
1441         atl1c_init_ring_ptrs(adapter);
1442         atl1c_set_multi(netdev);
1443         atl1c_restore_vlan(adapter);
1444
1445         num = atl1c_alloc_rx_buffer(adapter);
1446         if (unlikely(num == 0))
1447                 return -ENOMEM;
1448
1449         if (atl1c_configure_mac(adapter))
1450                 return -EIO;
1451
1452         return 0;
1453 }
1454
1455 static void atl1c_update_hw_stats(struct atl1c_adapter *adapter)
1456 {
1457         u16 hw_reg_addr = 0;
1458         unsigned long *stats_item = NULL;
1459         u32 data;
1460
1461         /* update rx status */
1462         hw_reg_addr = REG_MAC_RX_STATUS_BIN;
1463         stats_item  = &adapter->hw_stats.rx_ok;
1464         while (hw_reg_addr <= REG_MAC_RX_STATUS_END) {
1465                 AT_READ_REG(&adapter->hw, hw_reg_addr, &data);
1466                 *stats_item += data;
1467                 stats_item++;
1468                 hw_reg_addr += 4;
1469         }
1470 /* update tx status */
1471         hw_reg_addr = REG_MAC_TX_STATUS_BIN;
1472         stats_item  = &adapter->hw_stats.tx_ok;
1473         while (hw_reg_addr <= REG_MAC_TX_STATUS_END) {
1474                 AT_READ_REG(&adapter->hw, hw_reg_addr, &data);
1475                 *stats_item += data;
1476                 stats_item++;
1477                 hw_reg_addr += 4;
1478         }
1479 }
1480
1481 /**
1482  * atl1c_get_stats - Get System Network Statistics
1483  * @netdev: network interface device structure
1484  *
1485  * Returns the address of the device statistics structure.
1486  * The statistics are actually updated from the timer callback.
1487  */
1488 static struct net_device_stats *atl1c_get_stats(struct net_device *netdev)
1489 {
1490         struct atl1c_adapter *adapter = netdev_priv(netdev);
1491         struct atl1c_hw_stats  *hw_stats = &adapter->hw_stats;
1492         struct net_device_stats *net_stats = &netdev->stats;
1493
1494         atl1c_update_hw_stats(adapter);
1495         net_stats->rx_packets = hw_stats->rx_ok;
1496         net_stats->tx_packets = hw_stats->tx_ok;
1497         net_stats->rx_bytes   = hw_stats->rx_byte_cnt;
1498         net_stats->tx_bytes   = hw_stats->tx_byte_cnt;
1499         net_stats->multicast  = hw_stats->rx_mcast;
1500         net_stats->collisions = hw_stats->tx_1_col +
1501                                 hw_stats->tx_2_col * 2 +
1502                                 hw_stats->tx_late_col + hw_stats->tx_abort_col;
1503         net_stats->rx_errors  = hw_stats->rx_frag + hw_stats->rx_fcs_err +
1504                                 hw_stats->rx_len_err + hw_stats->rx_sz_ov +
1505                                 hw_stats->rx_rrd_ov + hw_stats->rx_align_err;
1506         net_stats->rx_fifo_errors   = hw_stats->rx_rxf_ov;
1507         net_stats->rx_length_errors = hw_stats->rx_len_err;
1508         net_stats->rx_crc_errors    = hw_stats->rx_fcs_err;
1509         net_stats->rx_frame_errors  = hw_stats->rx_align_err;
1510         net_stats->rx_over_errors   = hw_stats->rx_rrd_ov + hw_stats->rx_rxf_ov;
1511
1512         net_stats->rx_missed_errors = hw_stats->rx_rrd_ov + hw_stats->rx_rxf_ov;
1513
1514         net_stats->tx_errors = hw_stats->tx_late_col + hw_stats->tx_abort_col +
1515                                 hw_stats->tx_underrun + hw_stats->tx_trunc;
1516         net_stats->tx_fifo_errors    = hw_stats->tx_underrun;
1517         net_stats->tx_aborted_errors = hw_stats->tx_abort_col;
1518         net_stats->tx_window_errors  = hw_stats->tx_late_col;
1519
1520         return net_stats;
1521 }
1522
1523 static inline void atl1c_clear_phy_int(struct atl1c_adapter *adapter)
1524 {
1525         u16 phy_data;
1526
1527         spin_lock(&adapter->mdio_lock);
1528         atl1c_read_phy_reg(&adapter->hw, MII_ISR, &phy_data);
1529         spin_unlock(&adapter->mdio_lock);
1530 }
1531
1532 static bool atl1c_clean_tx_irq(struct atl1c_adapter *adapter,
1533                                 enum atl1c_trans_queue type)
1534 {
1535         struct atl1c_tpd_ring *tpd_ring = &adapter->tpd_ring[type];
1536         struct atl1c_buffer *buffer_info;
1537         struct pci_dev *pdev = adapter->pdev;
1538         u16 next_to_clean = atomic_read(&tpd_ring->next_to_clean);
1539         u16 hw_next_to_clean;
1540         u16 reg;
1541
1542         reg = type == atl1c_trans_high ? REG_TPD_PRI1_CIDX : REG_TPD_PRI0_CIDX;
1543
1544         AT_READ_REGW(&adapter->hw, reg, &hw_next_to_clean);
1545
1546         while (next_to_clean != hw_next_to_clean) {
1547                 buffer_info = &tpd_ring->buffer_info[next_to_clean];
1548                 atl1c_clean_buffer(pdev, buffer_info, 1);
1549                 if (++next_to_clean == tpd_ring->count)
1550                         next_to_clean = 0;
1551                 atomic_set(&tpd_ring->next_to_clean, next_to_clean);
1552         }
1553
1554         if (netif_queue_stopped(adapter->netdev) &&
1555                         netif_carrier_ok(adapter->netdev)) {
1556                 netif_wake_queue(adapter->netdev);
1557         }
1558
1559         return true;
1560 }
1561
1562 /**
1563  * atl1c_intr - Interrupt Handler
1564  * @irq: interrupt number
1565  * @data: pointer to a network interface device structure
1566  */
1567 static irqreturn_t atl1c_intr(int irq, void *data)
1568 {
1569         struct net_device *netdev  = data;
1570         struct atl1c_adapter *adapter = netdev_priv(netdev);
1571         struct pci_dev *pdev = adapter->pdev;
1572         struct atl1c_hw *hw = &adapter->hw;
1573         int max_ints = AT_MAX_INT_WORK;
1574         int handled = IRQ_NONE;
1575         u32 status;
1576         u32 reg_data;
1577
1578         do {
1579                 AT_READ_REG(hw, REG_ISR, &reg_data);
1580                 status = reg_data & hw->intr_mask;
1581
1582                 if (status == 0 || (status & ISR_DIS_INT) != 0) {
1583                         if (max_ints != AT_MAX_INT_WORK)
1584                                 handled = IRQ_HANDLED;
1585                         break;
1586                 }
1587                 /* link event */
1588                 if (status & ISR_GPHY)
1589                         atl1c_clear_phy_int(adapter);
1590                 /* Ack ISR */
1591                 AT_WRITE_REG(hw, REG_ISR, status | ISR_DIS_INT);
1592                 if (status & ISR_RX_PKT) {
1593                         if (likely(napi_schedule_prep(&adapter->napi))) {
1594                                 hw->intr_mask &= ~ISR_RX_PKT;
1595                                 AT_WRITE_REG(hw, REG_IMR, hw->intr_mask);
1596                                 __napi_schedule(&adapter->napi);
1597                         }
1598                 }
1599                 if (status & ISR_TX_PKT)
1600                         atl1c_clean_tx_irq(adapter, atl1c_trans_normal);
1601
1602                 handled = IRQ_HANDLED;
1603                 /* check if PCIE PHY Link down */
1604                 if (status & ISR_ERROR) {
1605                         if (netif_msg_hw(adapter))
1606                                 dev_err(&pdev->dev,
1607                                         "atl1c hardware error (status = 0x%x)\n",
1608                                         status & ISR_ERROR);
1609                         /* reset MAC */
1610                         set_bit(ATL1C_WORK_EVENT_RESET, &adapter->work_event);
1611                         schedule_work(&adapter->common_task);
1612                         return IRQ_HANDLED;
1613                 }
1614
1615                 if (status & ISR_OVER)
1616                         if (netif_msg_intr(adapter))
1617                                 dev_warn(&pdev->dev,
1618                                         "TX/RX overflow (status = 0x%x)\n",
1619                                         status & ISR_OVER);
1620
1621                 /* link event */
1622                 if (status & (ISR_GPHY | ISR_MANUAL)) {
1623                         netdev->stats.tx_carrier_errors++;
1624                         atl1c_link_chg_event(adapter);
1625                         break;
1626                 }
1627
1628         } while (--max_ints > 0);
1629         /* re-enable Interrupt*/
1630         AT_WRITE_REG(&adapter->hw, REG_ISR, 0);
1631         return handled;
1632 }
1633
1634 static inline void atl1c_rx_checksum(struct atl1c_adapter *adapter,
1635                   struct sk_buff *skb, struct atl1c_recv_ret_status *prrs)
1636 {
1637         /*
1638          * The pid field in RRS in not correct sometimes, so we
1639          * cannot figure out if the packet is fragmented or not,
1640          * so we tell the KERNEL CHECKSUM_NONE
1641          */
1642         skb_checksum_none_assert(skb);
1643 }
1644
1645 static int atl1c_alloc_rx_buffer(struct atl1c_adapter *adapter)
1646 {
1647         struct atl1c_rfd_ring *rfd_ring = &adapter->rfd_ring;
1648         struct pci_dev *pdev = adapter->pdev;
1649         struct atl1c_buffer *buffer_info, *next_info;
1650         struct sk_buff *skb;
1651         void *vir_addr = NULL;
1652         u16 num_alloc = 0;
1653         u16 rfd_next_to_use, next_next;
1654         struct atl1c_rx_free_desc *rfd_desc;
1655
1656         next_next = rfd_next_to_use = rfd_ring->next_to_use;
1657         if (++next_next == rfd_ring->count)
1658                 next_next = 0;
1659         buffer_info = &rfd_ring->buffer_info[rfd_next_to_use];
1660         next_info = &rfd_ring->buffer_info[next_next];
1661
1662         while (next_info->flags & ATL1C_BUFFER_FREE) {
1663                 rfd_desc = ATL1C_RFD_DESC(rfd_ring, rfd_next_to_use);
1664
1665                 skb = netdev_alloc_skb(adapter->netdev, adapter->rx_buffer_len);
1666                 if (unlikely(!skb)) {
1667                         if (netif_msg_rx_err(adapter))
1668                                 dev_warn(&pdev->dev, "alloc rx buffer failed\n");
1669                         break;
1670                 }
1671
1672                 /*
1673                  * Make buffer alignment 2 beyond a 16 byte boundary
1674                  * this will result in a 16 byte aligned IP header after
1675                  * the 14 byte MAC header is removed
1676                  */
1677                 vir_addr = skb->data;
1678                 ATL1C_SET_BUFFER_STATE(buffer_info, ATL1C_BUFFER_BUSY);
1679                 buffer_info->skb = skb;
1680                 buffer_info->length = adapter->rx_buffer_len;
1681                 buffer_info->dma = pci_map_single(pdev, vir_addr,
1682                                                 buffer_info->length,
1683                                                 PCI_DMA_FROMDEVICE);
1684                 ATL1C_SET_PCIMAP_TYPE(buffer_info, ATL1C_PCIMAP_SINGLE,
1685                         ATL1C_PCIMAP_FROMDEVICE);
1686                 rfd_desc->buffer_addr = cpu_to_le64(buffer_info->dma);
1687                 rfd_next_to_use = next_next;
1688                 if (++next_next == rfd_ring->count)
1689                         next_next = 0;
1690                 buffer_info = &rfd_ring->buffer_info[rfd_next_to_use];
1691                 next_info = &rfd_ring->buffer_info[next_next];
1692                 num_alloc++;
1693         }
1694
1695         if (num_alloc) {
1696                 /* TODO: update mailbox here */
1697                 wmb();
1698                 rfd_ring->next_to_use = rfd_next_to_use;
1699                 AT_WRITE_REG(&adapter->hw, REG_MB_RFD0_PROD_IDX,
1700                         rfd_ring->next_to_use & MB_RFDX_PROD_IDX_MASK);
1701         }
1702
1703         return num_alloc;
1704 }
1705
1706 static void atl1c_clean_rrd(struct atl1c_rrd_ring *rrd_ring,
1707                         struct  atl1c_recv_ret_status *rrs, u16 num)
1708 {
1709         u16 i;
1710         /* the relationship between rrd and rfd is one map one */
1711         for (i = 0; i < num; i++, rrs = ATL1C_RRD_DESC(rrd_ring,
1712                                         rrd_ring->next_to_clean)) {
1713                 rrs->word3 &= ~RRS_RXD_UPDATED;
1714                 if (++rrd_ring->next_to_clean == rrd_ring->count)
1715                         rrd_ring->next_to_clean = 0;
1716         }
1717 }
1718
1719 static void atl1c_clean_rfd(struct atl1c_rfd_ring *rfd_ring,
1720         struct atl1c_recv_ret_status *rrs, u16 num)
1721 {
1722         u16 i;
1723         u16 rfd_index;
1724         struct atl1c_buffer *buffer_info = rfd_ring->buffer_info;
1725
1726         rfd_index = (rrs->word0 >> RRS_RX_RFD_INDEX_SHIFT) &
1727                         RRS_RX_RFD_INDEX_MASK;
1728         for (i = 0; i < num; i++) {
1729                 buffer_info[rfd_index].skb = NULL;
1730                 ATL1C_SET_BUFFER_STATE(&buffer_info[rfd_index],
1731                                         ATL1C_BUFFER_FREE);
1732                 if (++rfd_index == rfd_ring->count)
1733                         rfd_index = 0;
1734         }
1735         rfd_ring->next_to_clean = rfd_index;
1736 }
1737
1738 static void atl1c_clean_rx_irq(struct atl1c_adapter *adapter,
1739                    int *work_done, int work_to_do)
1740 {
1741         u16 rfd_num, rfd_index;
1742         u16 count = 0;
1743         u16 length;
1744         struct pci_dev *pdev = adapter->pdev;
1745         struct net_device *netdev  = adapter->netdev;
1746         struct atl1c_rfd_ring *rfd_ring = &adapter->rfd_ring;
1747         struct atl1c_rrd_ring *rrd_ring = &adapter->rrd_ring;
1748         struct sk_buff *skb;
1749         struct atl1c_recv_ret_status *rrs;
1750         struct atl1c_buffer *buffer_info;
1751
1752         while (1) {
1753                 if (*work_done >= work_to_do)
1754                         break;
1755                 rrs = ATL1C_RRD_DESC(rrd_ring, rrd_ring->next_to_clean);
1756                 if (likely(RRS_RXD_IS_VALID(rrs->word3))) {
1757                         rfd_num = (rrs->word0 >> RRS_RX_RFD_CNT_SHIFT) &
1758                                 RRS_RX_RFD_CNT_MASK;
1759                         if (unlikely(rfd_num != 1))
1760                                 /* TODO support mul rfd*/
1761                                 if (netif_msg_rx_err(adapter))
1762                                         dev_warn(&pdev->dev,
1763                                                 "Multi rfd not support yet!\n");
1764                         goto rrs_checked;
1765                 } else {
1766                         break;
1767                 }
1768 rrs_checked:
1769                 atl1c_clean_rrd(rrd_ring, rrs, rfd_num);
1770                 if (rrs->word3 & (RRS_RX_ERR_SUM | RRS_802_3_LEN_ERR)) {
1771                         atl1c_clean_rfd(rfd_ring, rrs, rfd_num);
1772                                 if (netif_msg_rx_err(adapter))
1773                                         dev_warn(&pdev->dev,
1774                                                 "wrong packet! rrs word3 is %x\n",
1775                                                 rrs->word3);
1776                         continue;
1777                 }
1778
1779                 length = le16_to_cpu((rrs->word3 >> RRS_PKT_SIZE_SHIFT) &
1780                                 RRS_PKT_SIZE_MASK);
1781                 /* Good Receive */
1782                 if (likely(rfd_num == 1)) {
1783                         rfd_index = (rrs->word0 >> RRS_RX_RFD_INDEX_SHIFT) &
1784                                         RRS_RX_RFD_INDEX_MASK;
1785                         buffer_info = &rfd_ring->buffer_info[rfd_index];
1786                         pci_unmap_single(pdev, buffer_info->dma,
1787                                 buffer_info->length, PCI_DMA_FROMDEVICE);
1788                         skb = buffer_info->skb;
1789                 } else {
1790                         /* TODO */
1791                         if (netif_msg_rx_err(adapter))
1792                                 dev_warn(&pdev->dev,
1793                                         "Multi rfd not support yet!\n");
1794                         break;
1795                 }
1796                 atl1c_clean_rfd(rfd_ring, rrs, rfd_num);
1797                 skb_put(skb, length - ETH_FCS_LEN);
1798                 skb->protocol = eth_type_trans(skb, netdev);
1799                 atl1c_rx_checksum(adapter, skb, rrs);
1800                 if (rrs->word3 & RRS_VLAN_INS) {
1801                         u16 vlan;
1802
1803                         AT_TAG_TO_VLAN(rrs->vlan_tag, vlan);
1804                         vlan = le16_to_cpu(vlan);
1805                         __vlan_hwaccel_put_tag(skb, vlan);
1806                 }
1807                 netif_receive_skb(skb);
1808
1809                 (*work_done)++;
1810                 count++;
1811         }
1812         if (count)
1813                 atl1c_alloc_rx_buffer(adapter);
1814 }
1815
1816 /**
1817  * atl1c_clean - NAPI Rx polling callback
1818  */
1819 static int atl1c_clean(struct napi_struct *napi, int budget)
1820 {
1821         struct atl1c_adapter *adapter =
1822                         container_of(napi, struct atl1c_adapter, napi);
1823         int work_done = 0;
1824
1825         /* Keep link state information with original netdev */
1826         if (!netif_carrier_ok(adapter->netdev))
1827                 goto quit_polling;
1828         /* just enable one RXQ */
1829         atl1c_clean_rx_irq(adapter, &work_done, budget);
1830
1831         if (work_done < budget) {
1832 quit_polling:
1833                 napi_complete(napi);
1834                 adapter->hw.intr_mask |= ISR_RX_PKT;
1835                 AT_WRITE_REG(&adapter->hw, REG_IMR, adapter->hw.intr_mask);
1836         }
1837         return work_done;
1838 }
1839
1840 #ifdef CONFIG_NET_POLL_CONTROLLER
1841
1842 /*
1843  * Polling 'interrupt' - used by things like netconsole to send skbs
1844  * without having to re-enable interrupts. It's not called while
1845  * the interrupt routine is executing.
1846  */
1847 static void atl1c_netpoll(struct net_device *netdev)
1848 {
1849         struct atl1c_adapter *adapter = netdev_priv(netdev);
1850
1851         disable_irq(adapter->pdev->irq);
1852         atl1c_intr(adapter->pdev->irq, netdev);
1853         enable_irq(adapter->pdev->irq);
1854 }
1855 #endif
1856
1857 static inline u16 atl1c_tpd_avail(struct atl1c_adapter *adapter, enum atl1c_trans_queue type)
1858 {
1859         struct atl1c_tpd_ring *tpd_ring = &adapter->tpd_ring[type];
1860         u16 next_to_use = 0;
1861         u16 next_to_clean = 0;
1862
1863         next_to_clean = atomic_read(&tpd_ring->next_to_clean);
1864         next_to_use   = tpd_ring->next_to_use;
1865
1866         return (u16)(next_to_clean > next_to_use) ?
1867                 (next_to_clean - next_to_use - 1) :
1868                 (tpd_ring->count + next_to_clean - next_to_use - 1);
1869 }
1870
1871 /*
1872  * get next usable tpd
1873  * Note: should call atl1c_tdp_avail to make sure
1874  * there is enough tpd to use
1875  */
1876 static struct atl1c_tpd_desc *atl1c_get_tpd(struct atl1c_adapter *adapter,
1877         enum atl1c_trans_queue type)
1878 {
1879         struct atl1c_tpd_ring *tpd_ring = &adapter->tpd_ring[type];
1880         struct atl1c_tpd_desc *tpd_desc;
1881         u16 next_to_use = 0;
1882
1883         next_to_use = tpd_ring->next_to_use;
1884         if (++tpd_ring->next_to_use == tpd_ring->count)
1885                 tpd_ring->next_to_use = 0;
1886         tpd_desc = ATL1C_TPD_DESC(tpd_ring, next_to_use);
1887         memset(tpd_desc, 0, sizeof(struct atl1c_tpd_desc));
1888         return  tpd_desc;
1889 }
1890
1891 static struct atl1c_buffer *
1892 atl1c_get_tx_buffer(struct atl1c_adapter *adapter, struct atl1c_tpd_desc *tpd)
1893 {
1894         struct atl1c_tpd_ring *tpd_ring = adapter->tpd_ring;
1895
1896         return &tpd_ring->buffer_info[tpd -
1897                         (struct atl1c_tpd_desc *)tpd_ring->desc];
1898 }
1899
1900 /* Calculate the transmit packet descript needed*/
1901 static u16 atl1c_cal_tpd_req(const struct sk_buff *skb)
1902 {
1903         u16 tpd_req;
1904         u16 proto_hdr_len = 0;
1905
1906         tpd_req = skb_shinfo(skb)->nr_frags + 1;
1907
1908         if (skb_is_gso(skb)) {
1909                 proto_hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
1910                 if (proto_hdr_len < skb_headlen(skb))
1911                         tpd_req++;
1912                 if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6)
1913                         tpd_req++;
1914         }
1915         return tpd_req;
1916 }
1917
1918 static int atl1c_tso_csum(struct atl1c_adapter *adapter,
1919                           struct sk_buff *skb,
1920                           struct atl1c_tpd_desc **tpd,
1921                           enum atl1c_trans_queue type)
1922 {
1923         struct pci_dev *pdev = adapter->pdev;
1924         u8 hdr_len;
1925         u32 real_len;
1926         unsigned short offload_type;
1927         int err;
1928
1929         if (skb_is_gso(skb)) {
1930                 if (skb_header_cloned(skb)) {
1931                         err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
1932                         if (unlikely(err))
1933                                 return -1;
1934                 }
1935                 offload_type = skb_shinfo(skb)->gso_type;
1936
1937                 if (offload_type & SKB_GSO_TCPV4) {
1938                         real_len = (((unsigned char *)ip_hdr(skb) - skb->data)
1939                                         + ntohs(ip_hdr(skb)->tot_len));
1940
1941                         if (real_len < skb->len)
1942                                 pskb_trim(skb, real_len);
1943
1944                         hdr_len = (skb_transport_offset(skb) + tcp_hdrlen(skb));
1945                         if (unlikely(skb->len == hdr_len)) {
1946                                 /* only xsum need */
1947                                 if (netif_msg_tx_queued(adapter))
1948                                         dev_warn(&pdev->dev,
1949                                                 "IPV4 tso with zero data??\n");
1950                                 goto check_sum;
1951                         } else {
1952                                 ip_hdr(skb)->check = 0;
1953                                 tcp_hdr(skb)->check = ~csum_tcpudp_magic(
1954                                                         ip_hdr(skb)->saddr,
1955                                                         ip_hdr(skb)->daddr,
1956                                                         0, IPPROTO_TCP, 0);
1957                                 (*tpd)->word1 |= 1 << TPD_IPV4_PACKET_SHIFT;
1958                         }
1959                 }
1960
1961                 if (offload_type & SKB_GSO_TCPV6) {
1962                         struct atl1c_tpd_ext_desc *etpd =
1963                                 *(struct atl1c_tpd_ext_desc **)(tpd);
1964
1965                         memset(etpd, 0, sizeof(struct atl1c_tpd_ext_desc));
1966                         *tpd = atl1c_get_tpd(adapter, type);
1967                         ipv6_hdr(skb)->payload_len = 0;
1968                         /* check payload == 0 byte ? */
1969                         hdr_len = (skb_transport_offset(skb) + tcp_hdrlen(skb));
1970                         if (unlikely(skb->len == hdr_len)) {
1971                                 /* only xsum need */
1972                                 if (netif_msg_tx_queued(adapter))
1973                                         dev_warn(&pdev->dev,
1974                                                 "IPV6 tso with zero data??\n");
1975                                 goto check_sum;
1976                         } else
1977                                 tcp_hdr(skb)->check = ~csum_ipv6_magic(
1978                                                 &ipv6_hdr(skb)->saddr,
1979                                                 &ipv6_hdr(skb)->daddr,
1980                                                 0, IPPROTO_TCP, 0);
1981                         etpd->word1 |= 1 << TPD_LSO_EN_SHIFT;
1982                         etpd->word1 |= 1 << TPD_LSO_VER_SHIFT;
1983                         etpd->pkt_len = cpu_to_le32(skb->len);
1984                         (*tpd)->word1 |= 1 << TPD_LSO_VER_SHIFT;
1985                 }
1986
1987                 (*tpd)->word1 |= 1 << TPD_LSO_EN_SHIFT;
1988                 (*tpd)->word1 |= (skb_transport_offset(skb) & TPD_TCPHDR_OFFSET_MASK) <<
1989                                 TPD_TCPHDR_OFFSET_SHIFT;
1990                 (*tpd)->word1 |= (skb_shinfo(skb)->gso_size & TPD_MSS_MASK) <<
1991                                 TPD_MSS_SHIFT;
1992                 return 0;
1993         }
1994
1995 check_sum:
1996         if (likely(skb->ip_summed == CHECKSUM_PARTIAL)) {
1997                 u8 css, cso;
1998                 cso = skb_checksum_start_offset(skb);
1999
2000                 if (unlikely(cso & 0x1)) {
2001                         if (netif_msg_tx_err(adapter))
2002                                 dev_err(&adapter->pdev->dev,
2003                                         "payload offset should not an event number\n");
2004                         return -1;
2005                 } else {
2006                         css = cso + skb->csum_offset;
2007
2008                         (*tpd)->word1 |= ((cso >> 1) & TPD_PLOADOFFSET_MASK) <<
2009                                         TPD_PLOADOFFSET_SHIFT;
2010                         (*tpd)->word1 |= ((css >> 1) & TPD_CCSUM_OFFSET_MASK) <<
2011                                         TPD_CCSUM_OFFSET_SHIFT;
2012                         (*tpd)->word1 |= 1 << TPD_CCSUM_EN_SHIFT;
2013                 }
2014         }
2015         return 0;
2016 }
2017
2018 static void atl1c_tx_map(struct atl1c_adapter *adapter,
2019                       struct sk_buff *skb, struct atl1c_tpd_desc *tpd,
2020                         enum atl1c_trans_queue type)
2021 {
2022         struct atl1c_tpd_desc *use_tpd = NULL;
2023         struct atl1c_buffer *buffer_info = NULL;
2024         u16 buf_len = skb_headlen(skb);
2025         u16 map_len = 0;
2026         u16 mapped_len = 0;
2027         u16 hdr_len = 0;
2028         u16 nr_frags;
2029         u16 f;
2030         int tso;
2031
2032         nr_frags = skb_shinfo(skb)->nr_frags;
2033         tso = (tpd->word1 >> TPD_LSO_EN_SHIFT) & TPD_LSO_EN_MASK;
2034         if (tso) {
2035                 /* TSO */
2036                 map_len = hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
2037                 use_tpd = tpd;
2038
2039                 buffer_info = atl1c_get_tx_buffer(adapter, use_tpd);
2040                 buffer_info->length = map_len;
2041                 buffer_info->dma = pci_map_single(adapter->pdev,
2042                                         skb->data, hdr_len, PCI_DMA_TODEVICE);
2043                 ATL1C_SET_BUFFER_STATE(buffer_info, ATL1C_BUFFER_BUSY);
2044                 ATL1C_SET_PCIMAP_TYPE(buffer_info, ATL1C_PCIMAP_SINGLE,
2045                         ATL1C_PCIMAP_TODEVICE);
2046                 mapped_len += map_len;
2047                 use_tpd->buffer_addr = cpu_to_le64(buffer_info->dma);
2048                 use_tpd->buffer_len = cpu_to_le16(buffer_info->length);
2049         }
2050
2051         if (mapped_len < buf_len) {
2052                 /* mapped_len == 0, means we should use the first tpd,
2053                    which is given by caller  */
2054                 if (mapped_len == 0)
2055                         use_tpd = tpd;
2056                 else {
2057                         use_tpd = atl1c_get_tpd(adapter, type);
2058                         memcpy(use_tpd, tpd, sizeof(struct atl1c_tpd_desc));
2059                 }
2060                 buffer_info = atl1c_get_tx_buffer(adapter, use_tpd);
2061                 buffer_info->length = buf_len - mapped_len;
2062                 buffer_info->dma =
2063                         pci_map_single(adapter->pdev, skb->data + mapped_len,
2064                                         buffer_info->length, PCI_DMA_TODEVICE);
2065                 ATL1C_SET_BUFFER_STATE(buffer_info, ATL1C_BUFFER_BUSY);
2066                 ATL1C_SET_PCIMAP_TYPE(buffer_info, ATL1C_PCIMAP_SINGLE,
2067                         ATL1C_PCIMAP_TODEVICE);
2068                 use_tpd->buffer_addr = cpu_to_le64(buffer_info->dma);
2069                 use_tpd->buffer_len  = cpu_to_le16(buffer_info->length);
2070         }
2071
2072         for (f = 0; f < nr_frags; f++) {
2073                 struct skb_frag_struct *frag;
2074
2075                 frag = &skb_shinfo(skb)->frags[f];
2076
2077                 use_tpd = atl1c_get_tpd(adapter, type);
2078                 memcpy(use_tpd, tpd, sizeof(struct atl1c_tpd_desc));
2079
2080                 buffer_info = atl1c_get_tx_buffer(adapter, use_tpd);
2081                 buffer_info->length = skb_frag_size(frag);
2082                 buffer_info->dma = skb_frag_dma_map(&adapter->pdev->dev,
2083                                                     frag, 0,
2084                                                     buffer_info->length,
2085                                                     DMA_TO_DEVICE);
2086                 ATL1C_SET_BUFFER_STATE(buffer_info, ATL1C_BUFFER_BUSY);
2087                 ATL1C_SET_PCIMAP_TYPE(buffer_info, ATL1C_PCIMAP_PAGE,
2088                         ATL1C_PCIMAP_TODEVICE);
2089                 use_tpd->buffer_addr = cpu_to_le64(buffer_info->dma);
2090                 use_tpd->buffer_len  = cpu_to_le16(buffer_info->length);
2091         }
2092
2093         /* The last tpd */
2094         use_tpd->word1 |= 1 << TPD_EOP_SHIFT;
2095         /* The last buffer info contain the skb address,
2096            so it will be free after unmap */
2097         buffer_info->skb = skb;
2098 }
2099
2100 static void atl1c_tx_queue(struct atl1c_adapter *adapter, struct sk_buff *skb,
2101                            struct atl1c_tpd_desc *tpd, enum atl1c_trans_queue type)
2102 {
2103         struct atl1c_tpd_ring *tpd_ring = &adapter->tpd_ring[type];
2104         u16 reg;
2105
2106         reg = type == atl1c_trans_high ? REG_TPD_PRI1_PIDX : REG_TPD_PRI0_PIDX;
2107         AT_WRITE_REGW(&adapter->hw, reg, tpd_ring->next_to_use);
2108 }
2109
2110 static netdev_tx_t atl1c_xmit_frame(struct sk_buff *skb,
2111                                           struct net_device *netdev)
2112 {
2113         struct atl1c_adapter *adapter = netdev_priv(netdev);
2114         unsigned long flags;
2115         u16 tpd_req = 1;
2116         struct atl1c_tpd_desc *tpd;
2117         enum atl1c_trans_queue type = atl1c_trans_normal;
2118
2119         if (test_bit(__AT_DOWN, &adapter->flags)) {
2120                 dev_kfree_skb_any(skb);
2121                 return NETDEV_TX_OK;
2122         }
2123
2124         tpd_req = atl1c_cal_tpd_req(skb);
2125         if (!spin_trylock_irqsave(&adapter->tx_lock, flags)) {
2126                 if (netif_msg_pktdata(adapter))
2127                         dev_info(&adapter->pdev->dev, "tx locked\n");
2128                 return NETDEV_TX_LOCKED;
2129         }
2130
2131         if (atl1c_tpd_avail(adapter, type) < tpd_req) {
2132                 /* no enough descriptor, just stop queue */
2133                 netif_stop_queue(netdev);
2134                 spin_unlock_irqrestore(&adapter->tx_lock, flags);
2135                 return NETDEV_TX_BUSY;
2136         }
2137
2138         tpd = atl1c_get_tpd(adapter, type);
2139
2140         /* do TSO and check sum */
2141         if (atl1c_tso_csum(adapter, skb, &tpd, type) != 0) {
2142                 spin_unlock_irqrestore(&adapter->tx_lock, flags);
2143                 dev_kfree_skb_any(skb);
2144                 return NETDEV_TX_OK;
2145         }
2146
2147         if (unlikely(vlan_tx_tag_present(skb))) {
2148                 u16 vlan = vlan_tx_tag_get(skb);
2149                 __le16 tag;
2150
2151                 vlan = cpu_to_le16(vlan);
2152                 AT_VLAN_TO_TAG(vlan, tag);
2153                 tpd->word1 |= 1 << TPD_INS_VTAG_SHIFT;
2154                 tpd->vlan_tag = tag;
2155         }
2156
2157         if (skb_network_offset(skb) != ETH_HLEN)
2158                 tpd->word1 |= 1 << TPD_ETH_TYPE_SHIFT; /* Ethernet frame */
2159
2160         atl1c_tx_map(adapter, skb, tpd, type);
2161         atl1c_tx_queue(adapter, skb, tpd, type);
2162
2163         spin_unlock_irqrestore(&adapter->tx_lock, flags);
2164         return NETDEV_TX_OK;
2165 }
2166
2167 static void atl1c_free_irq(struct atl1c_adapter *adapter)
2168 {
2169         struct net_device *netdev = adapter->netdev;
2170
2171         free_irq(adapter->pdev->irq, netdev);
2172
2173         if (adapter->have_msi)
2174                 pci_disable_msi(adapter->pdev);
2175 }
2176
2177 static int atl1c_request_irq(struct atl1c_adapter *adapter)
2178 {
2179         struct pci_dev    *pdev   = adapter->pdev;
2180         struct net_device *netdev = adapter->netdev;
2181         int flags = 0;
2182         int err = 0;
2183
2184         adapter->have_msi = true;
2185         err = pci_enable_msi(adapter->pdev);
2186         if (err) {
2187                 if (netif_msg_ifup(adapter))
2188                         dev_err(&pdev->dev,
2189                                 "Unable to allocate MSI interrupt Error: %d\n",
2190                                 err);
2191                 adapter->have_msi = false;
2192         }
2193
2194         if (!adapter->have_msi)
2195                 flags |= IRQF_SHARED;
2196         err = request_irq(adapter->pdev->irq, atl1c_intr, flags,
2197                         netdev->name, netdev);
2198         if (err) {
2199                 if (netif_msg_ifup(adapter))
2200                         dev_err(&pdev->dev,
2201                                 "Unable to allocate interrupt Error: %d\n",
2202                                 err);
2203                 if (adapter->have_msi)
2204                         pci_disable_msi(adapter->pdev);
2205                 return err;
2206         }
2207         if (netif_msg_ifup(adapter))
2208                 dev_dbg(&pdev->dev, "atl1c_request_irq OK\n");
2209         return err;
2210 }
2211
2212
2213 static void atl1c_reset_dma_ring(struct atl1c_adapter *adapter)
2214 {
2215         /* release tx-pending skbs and reset tx/rx ring index */
2216         atl1c_clean_tx_ring(adapter, atl1c_trans_normal);
2217         atl1c_clean_tx_ring(adapter, atl1c_trans_high);
2218         atl1c_clean_rx_ring(adapter);
2219 }
2220
2221 static int atl1c_up(struct atl1c_adapter *adapter)
2222 {
2223         struct net_device *netdev = adapter->netdev;
2224         int err;
2225
2226         netif_carrier_off(netdev);
2227
2228         err = atl1c_configure(adapter);
2229         if (unlikely(err))
2230                 goto err_up;
2231
2232         err = atl1c_request_irq(adapter);
2233         if (unlikely(err))
2234                 goto err_up;
2235
2236         atl1c_check_link_status(adapter);
2237         clear_bit(__AT_DOWN, &adapter->flags);
2238         napi_enable(&adapter->napi);
2239         atl1c_irq_enable(adapter);
2240         netif_start_queue(netdev);
2241         return err;
2242
2243 err_up:
2244         atl1c_clean_rx_ring(adapter);
2245         return err;
2246 }
2247
2248 static void atl1c_down(struct atl1c_adapter *adapter)
2249 {
2250         struct net_device *netdev = adapter->netdev;
2251
2252         atl1c_del_timer(adapter);
2253         adapter->work_event = 0; /* clear all event */
2254         /* signal that we're down so the interrupt handler does not
2255          * reschedule our watchdog timer */
2256         set_bit(__AT_DOWN, &adapter->flags);
2257         netif_carrier_off(netdev);
2258         napi_disable(&adapter->napi);
2259         atl1c_irq_disable(adapter);
2260         atl1c_free_irq(adapter);
2261         /* disable ASPM if device inactive */
2262         atl1c_disable_l0s_l1(&adapter->hw);
2263         /* reset MAC to disable all RX/TX */
2264         atl1c_reset_mac(&adapter->hw);
2265         msleep(1);
2266
2267         adapter->link_speed = SPEED_0;
2268         adapter->link_duplex = -1;
2269         atl1c_reset_dma_ring(adapter);
2270 }
2271
2272 /**
2273  * atl1c_open - Called when a network interface is made active
2274  * @netdev: network interface device structure
2275  *
2276  * Returns 0 on success, negative value on failure
2277  *
2278  * The open entry point is called when a network interface is made
2279  * active by the system (IFF_UP).  At this point all resources needed
2280  * for transmit and receive operations are allocated, the interrupt
2281  * handler is registered with the OS, the watchdog timer is started,
2282  * and the stack is notified that the interface is ready.
2283  */
2284 static int atl1c_open(struct net_device *netdev)
2285 {
2286         struct atl1c_adapter *adapter = netdev_priv(netdev);
2287         int err;
2288
2289         /* disallow open during test */
2290         if (test_bit(__AT_TESTING, &adapter->flags))
2291                 return -EBUSY;
2292
2293         /* allocate rx/tx dma buffer & descriptors */
2294         err = atl1c_setup_ring_resources(adapter);
2295         if (unlikely(err))
2296                 return err;
2297
2298         err = atl1c_up(adapter);
2299         if (unlikely(err))
2300                 goto err_up;
2301
2302         return 0;
2303
2304 err_up:
2305         atl1c_free_irq(adapter);
2306         atl1c_free_ring_resources(adapter);
2307         atl1c_reset_mac(&adapter->hw);
2308         return err;
2309 }
2310
2311 /**
2312  * atl1c_close - Disables a network interface
2313  * @netdev: network interface device structure
2314  *
2315  * Returns 0, this is not allowed to fail
2316  *
2317  * The close entry point is called when an interface is de-activated
2318  * by the OS.  The hardware is still under the drivers control, but
2319  * needs to be disabled.  A global MAC reset is issued to stop the
2320  * hardware, and all transmit and receive resources are freed.
2321  */
2322 static int atl1c_close(struct net_device *netdev)
2323 {
2324         struct atl1c_adapter *adapter = netdev_priv(netdev);
2325
2326         WARN_ON(test_bit(__AT_RESETTING, &adapter->flags));
2327         set_bit(__AT_DOWN, &adapter->flags);
2328         cancel_work_sync(&adapter->common_task);
2329         atl1c_down(adapter);
2330         atl1c_free_ring_resources(adapter);
2331         return 0;
2332 }
2333
2334 static int atl1c_suspend(struct device *dev)
2335 {
2336         struct pci_dev *pdev = to_pci_dev(dev);
2337         struct net_device *netdev = pci_get_drvdata(pdev);
2338         struct atl1c_adapter *adapter = netdev_priv(netdev);
2339         struct atl1c_hw *hw = &adapter->hw;
2340         u32 wufc = adapter->wol;
2341
2342         atl1c_disable_l0s_l1(hw);
2343         if (netif_running(netdev)) {
2344                 WARN_ON(test_bit(__AT_RESETTING, &adapter->flags));
2345                 atl1c_down(adapter);
2346         }
2347         netif_device_detach(netdev);
2348
2349         if (wufc)
2350                 if (atl1c_phy_to_ps_link(hw) != 0)
2351                         dev_dbg(&pdev->dev, "phy power saving failed");
2352
2353         atl1c_power_saving(hw, wufc);
2354
2355         return 0;
2356 }
2357
2358 #ifdef CONFIG_PM_SLEEP
2359 static int atl1c_resume(struct device *dev)
2360 {
2361         struct pci_dev *pdev = to_pci_dev(dev);
2362         struct net_device *netdev = pci_get_drvdata(pdev);
2363         struct atl1c_adapter *adapter = netdev_priv(netdev);
2364
2365         AT_WRITE_REG(&adapter->hw, REG_WOL_CTRL, 0);
2366         atl1c_reset_pcie(&adapter->hw, ATL1C_PCIE_L0S_L1_DISABLE);
2367
2368         atl1c_phy_reset(&adapter->hw);
2369         atl1c_reset_mac(&adapter->hw);
2370         atl1c_phy_init(&adapter->hw);
2371
2372 #if 0
2373         AT_READ_REG(&adapter->hw, REG_PM_CTRLSTAT, &pm_data);
2374         pm_data &= ~PM_CTRLSTAT_PME_EN;
2375         AT_WRITE_REG(&adapter->hw, REG_PM_CTRLSTAT, pm_data);
2376 #endif
2377
2378         netif_device_attach(netdev);
2379         if (netif_running(netdev))
2380                 atl1c_up(adapter);
2381
2382         return 0;
2383 }
2384 #endif
2385
2386 static void atl1c_shutdown(struct pci_dev *pdev)
2387 {
2388         struct net_device *netdev = pci_get_drvdata(pdev);
2389         struct atl1c_adapter *adapter = netdev_priv(netdev);
2390
2391         atl1c_suspend(&pdev->dev);
2392         pci_wake_from_d3(pdev, adapter->wol);
2393         pci_set_power_state(pdev, PCI_D3hot);
2394 }
2395
2396 static const struct net_device_ops atl1c_netdev_ops = {
2397         .ndo_open               = atl1c_open,
2398         .ndo_stop               = atl1c_close,
2399         .ndo_validate_addr      = eth_validate_addr,
2400         .ndo_start_xmit         = atl1c_xmit_frame,
2401         .ndo_set_mac_address    = atl1c_set_mac_addr,
2402         .ndo_set_rx_mode        = atl1c_set_multi,
2403         .ndo_change_mtu         = atl1c_change_mtu,
2404         .ndo_fix_features       = atl1c_fix_features,
2405         .ndo_set_features       = atl1c_set_features,
2406         .ndo_do_ioctl           = atl1c_ioctl,
2407         .ndo_tx_timeout         = atl1c_tx_timeout,
2408         .ndo_get_stats          = atl1c_get_stats,
2409 #ifdef CONFIG_NET_POLL_CONTROLLER
2410         .ndo_poll_controller    = atl1c_netpoll,
2411 #endif
2412 };
2413
2414 static int atl1c_init_netdev(struct net_device *netdev, struct pci_dev *pdev)
2415 {
2416         SET_NETDEV_DEV(netdev, &pdev->dev);
2417         pci_set_drvdata(pdev, netdev);
2418
2419         netdev->netdev_ops = &atl1c_netdev_ops;
2420         netdev->watchdog_timeo = AT_TX_WATCHDOG;
2421         atl1c_set_ethtool_ops(netdev);
2422
2423         /* TODO: add when ready */
2424         netdev->hw_features =   NETIF_F_SG         |
2425                                 NETIF_F_HW_CSUM    |
2426                                 NETIF_F_HW_VLAN_RX |
2427                                 NETIF_F_TSO        |
2428                                 NETIF_F_TSO6;
2429         netdev->features =      netdev->hw_features |
2430                                 NETIF_F_HW_VLAN_TX;
2431         return 0;
2432 }
2433
2434 /**
2435  * atl1c_probe - Device Initialization Routine
2436  * @pdev: PCI device information struct
2437  * @ent: entry in atl1c_pci_tbl
2438  *
2439  * Returns 0 on success, negative on failure
2440  *
2441  * atl1c_probe initializes an adapter identified by a pci_dev structure.
2442  * The OS initialization, configuring of the adapter private structure,
2443  * and a hardware reset occur.
2444  */
2445 static int atl1c_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
2446 {
2447         struct net_device *netdev;
2448         struct atl1c_adapter *adapter;
2449         static int cards_found;
2450
2451         int err = 0;
2452
2453         /* enable device (incl. PCI PM wakeup and hotplug setup) */
2454         err = pci_enable_device_mem(pdev);
2455         if (err) {
2456                 dev_err(&pdev->dev, "cannot enable PCI device\n");
2457                 return err;
2458         }
2459
2460         /*
2461          * The atl1c chip can DMA to 64-bit addresses, but it uses a single
2462          * shared register for the high 32 bits, so only a single, aligned,
2463          * 4 GB physical address range can be used at a time.
2464          *
2465          * Supporting 64-bit DMA on this hardware is more trouble than it's
2466          * worth.  It is far easier to limit to 32-bit DMA than update
2467          * various kernel subsystems to support the mechanics required by a
2468          * fixed-high-32-bit system.
2469          */
2470         if ((pci_set_dma_mask(pdev, DMA_BIT_MASK(32)) != 0) ||
2471             (pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32)) != 0)) {
2472                 dev_err(&pdev->dev, "No usable DMA configuration,aborting\n");
2473                 goto err_dma;
2474         }
2475
2476         err = pci_request_regions(pdev, atl1c_driver_name);
2477         if (err) {
2478                 dev_err(&pdev->dev, "cannot obtain PCI resources\n");
2479                 goto err_pci_reg;
2480         }
2481
2482         pci_set_master(pdev);
2483
2484         netdev = alloc_etherdev(sizeof(struct atl1c_adapter));
2485         if (netdev == NULL) {
2486                 err = -ENOMEM;
2487                 goto err_alloc_etherdev;
2488         }
2489
2490         err = atl1c_init_netdev(netdev, pdev);
2491         if (err) {
2492                 dev_err(&pdev->dev, "init netdevice failed\n");
2493                 goto err_init_netdev;
2494         }
2495         adapter = netdev_priv(netdev);
2496         adapter->bd_number = cards_found;
2497         adapter->netdev = netdev;
2498         adapter->pdev = pdev;
2499         adapter->hw.adapter = adapter;
2500         adapter->msg_enable = netif_msg_init(-1, atl1c_default_msg);
2501         adapter->hw.hw_addr = ioremap(pci_resource_start(pdev, 0), pci_resource_len(pdev, 0));
2502         if (!adapter->hw.hw_addr) {
2503                 err = -EIO;
2504                 dev_err(&pdev->dev, "cannot map device registers\n");
2505                 goto err_ioremap;
2506         }
2507
2508         /* init mii data */
2509         adapter->mii.dev = netdev;
2510         adapter->mii.mdio_read  = atl1c_mdio_read;
2511         adapter->mii.mdio_write = atl1c_mdio_write;
2512         adapter->mii.phy_id_mask = 0x1f;
2513         adapter->mii.reg_num_mask = MDIO_CTRL_REG_MASK;
2514         netif_napi_add(netdev, &adapter->napi, atl1c_clean, 64);
2515         setup_timer(&adapter->phy_config_timer, atl1c_phy_config,
2516                         (unsigned long)adapter);
2517         /* setup the private structure */
2518         err = atl1c_sw_init(adapter);
2519         if (err) {
2520                 dev_err(&pdev->dev, "net device private data init failed\n");
2521                 goto err_sw_init;
2522         }
2523         atl1c_reset_pcie(&adapter->hw, ATL1C_PCIE_L0S_L1_DISABLE);
2524
2525         /* Init GPHY as early as possible due to power saving issue  */
2526         atl1c_phy_reset(&adapter->hw);
2527
2528         err = atl1c_reset_mac(&adapter->hw);
2529         if (err) {
2530                 err = -EIO;
2531                 goto err_reset;
2532         }
2533
2534         /* reset the controller to
2535          * put the device in a known good starting state */
2536         err = atl1c_phy_init(&adapter->hw);
2537         if (err) {
2538                 err = -EIO;
2539                 goto err_reset;
2540         }
2541         if (atl1c_read_mac_addr(&adapter->hw)) {
2542                 /* got a random MAC address, set NET_ADDR_RANDOM to netdev */
2543                 netdev->addr_assign_type |= NET_ADDR_RANDOM;
2544         }
2545         memcpy(netdev->dev_addr, adapter->hw.mac_addr, netdev->addr_len);
2546         memcpy(netdev->perm_addr, adapter->hw.mac_addr, netdev->addr_len);
2547         if (netif_msg_probe(adapter))
2548                 dev_dbg(&pdev->dev, "mac address : %pM\n",
2549                         adapter->hw.mac_addr);
2550
2551         atl1c_hw_set_mac_addr(&adapter->hw, adapter->hw.mac_addr);
2552         INIT_WORK(&adapter->common_task, atl1c_common_task);
2553         adapter->work_event = 0;
2554         err = register_netdev(netdev);
2555         if (err) {
2556                 dev_err(&pdev->dev, "register netdevice failed\n");
2557                 goto err_register;
2558         }
2559
2560         if (netif_msg_probe(adapter))
2561                 dev_info(&pdev->dev, "version %s\n", ATL1C_DRV_VERSION);
2562         cards_found++;
2563         return 0;
2564
2565 err_reset:
2566 err_register:
2567 err_sw_init:
2568         iounmap(adapter->hw.hw_addr);
2569 err_init_netdev:
2570 err_ioremap:
2571         free_netdev(netdev);
2572 err_alloc_etherdev:
2573         pci_release_regions(pdev);
2574 err_pci_reg:
2575 err_dma:
2576         pci_disable_device(pdev);
2577         return err;
2578 }
2579
2580 /**
2581  * atl1c_remove - Device Removal Routine
2582  * @pdev: PCI device information struct
2583  *
2584  * atl1c_remove is called by the PCI subsystem to alert the driver
2585  * that it should release a PCI device.  The could be caused by a
2586  * Hot-Plug event, or because the driver is going to be removed from
2587  * memory.
2588  */
2589 static void atl1c_remove(struct pci_dev *pdev)
2590 {
2591         struct net_device *netdev = pci_get_drvdata(pdev);
2592         struct atl1c_adapter *adapter = netdev_priv(netdev);
2593
2594         unregister_netdev(netdev);
2595         /* restore permanent address */
2596         atl1c_hw_set_mac_addr(&adapter->hw, adapter->hw.perm_mac_addr);
2597         atl1c_phy_disable(&adapter->hw);
2598
2599         iounmap(adapter->hw.hw_addr);
2600
2601         pci_release_regions(pdev);
2602         pci_disable_device(pdev);
2603         free_netdev(netdev);
2604 }
2605
2606 /**
2607  * atl1c_io_error_detected - called when PCI error is detected
2608  * @pdev: Pointer to PCI device
2609  * @state: The current pci connection state
2610  *
2611  * This function is called after a PCI bus error affecting
2612  * this device has been detected.
2613  */
2614 static pci_ers_result_t atl1c_io_error_detected(struct pci_dev *pdev,
2615                                                 pci_channel_state_t state)
2616 {
2617         struct net_device *netdev = pci_get_drvdata(pdev);
2618         struct atl1c_adapter *adapter = netdev_priv(netdev);
2619
2620         netif_device_detach(netdev);
2621
2622         if (state == pci_channel_io_perm_failure)
2623                 return PCI_ERS_RESULT_DISCONNECT;
2624
2625         if (netif_running(netdev))
2626                 atl1c_down(adapter);
2627
2628         pci_disable_device(pdev);
2629
2630         /* Request a slot slot reset. */
2631         return PCI_ERS_RESULT_NEED_RESET;
2632 }
2633
2634 /**
2635  * atl1c_io_slot_reset - called after the pci bus has been reset.
2636  * @pdev: Pointer to PCI device
2637  *
2638  * Restart the card from scratch, as if from a cold-boot. Implementation
2639  * resembles the first-half of the e1000_resume routine.
2640  */
2641 static pci_ers_result_t atl1c_io_slot_reset(struct pci_dev *pdev)
2642 {
2643         struct net_device *netdev = pci_get_drvdata(pdev);
2644         struct atl1c_adapter *adapter = netdev_priv(netdev);
2645
2646         if (pci_enable_device(pdev)) {
2647                 if (netif_msg_hw(adapter))
2648                         dev_err(&pdev->dev,
2649                                 "Cannot re-enable PCI device after reset\n");
2650                 return PCI_ERS_RESULT_DISCONNECT;
2651         }
2652         pci_set_master(pdev);
2653
2654         pci_enable_wake(pdev, PCI_D3hot, 0);
2655         pci_enable_wake(pdev, PCI_D3cold, 0);
2656
2657         atl1c_reset_mac(&adapter->hw);
2658
2659         return PCI_ERS_RESULT_RECOVERED;
2660 }
2661
2662 /**
2663  * atl1c_io_resume - called when traffic can start flowing again.
2664  * @pdev: Pointer to PCI device
2665  *
2666  * This callback is called when the error recovery driver tells us that
2667  * its OK to resume normal operation. Implementation resembles the
2668  * second-half of the atl1c_resume routine.
2669  */
2670 static void atl1c_io_resume(struct pci_dev *pdev)
2671 {
2672         struct net_device *netdev = pci_get_drvdata(pdev);
2673         struct atl1c_adapter *adapter = netdev_priv(netdev);
2674
2675         if (netif_running(netdev)) {
2676                 if (atl1c_up(adapter)) {
2677                         if (netif_msg_hw(adapter))
2678                                 dev_err(&pdev->dev,
2679                                         "Cannot bring device back up after reset\n");
2680                         return;
2681                 }
2682         }
2683
2684         netif_device_attach(netdev);
2685 }
2686
2687 static const struct pci_error_handlers atl1c_err_handler = {
2688         .error_detected = atl1c_io_error_detected,
2689         .slot_reset = atl1c_io_slot_reset,
2690         .resume = atl1c_io_resume,
2691 };
2692
2693 static SIMPLE_DEV_PM_OPS(atl1c_pm_ops, atl1c_suspend, atl1c_resume);
2694
2695 static struct pci_driver atl1c_driver = {
2696         .name     = atl1c_driver_name,
2697         .id_table = atl1c_pci_tbl,
2698         .probe    = atl1c_probe,
2699         .remove   = atl1c_remove,
2700         .shutdown = atl1c_shutdown,
2701         .err_handler = &atl1c_err_handler,
2702         .driver.pm = &atl1c_pm_ops,
2703 };
2704
2705 /**
2706  * atl1c_init_module - Driver Registration Routine
2707  *
2708  * atl1c_init_module is the first routine called when the driver is
2709  * loaded. All it does is register with the PCI subsystem.
2710  */
2711 static int __init atl1c_init_module(void)
2712 {
2713         return pci_register_driver(&atl1c_driver);
2714 }
2715
2716 /**
2717  * atl1c_exit_module - Driver Exit Cleanup Routine
2718  *
2719  * atl1c_exit_module is called just before the driver is removed
2720  * from memory.
2721  */
2722 static void __exit atl1c_exit_module(void)
2723 {
2724         pci_unregister_driver(&atl1c_driver);
2725 }
2726
2727 module_init(atl1c_init_module);
2728 module_exit(atl1c_exit_module);