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 "1.0.1.1-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 const struct pci_device_id 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("Qualcomm 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 
69 static const u32 atl1c_default_msg = NETIF_MSG_DRV | NETIF_MSG_PROBE |
70 	NETIF_MSG_LINK | NETIF_MSG_TIMER | NETIF_MSG_IFDOWN | NETIF_MSG_IFUP;
71 static void atl1c_pcie_patch(struct atl1c_hw *hw)
72 {
73 	u32 mst_data, data;
74 
75 	/* pclk sel could switch to 25M */
76 	AT_READ_REG(hw, REG_MASTER_CTRL, &mst_data);
77 	mst_data &= ~MASTER_CTRL_CLK_SEL_DIS;
78 	AT_WRITE_REG(hw, REG_MASTER_CTRL, mst_data);
79 
80 	/* WoL/PCIE related settings */
81 	if (hw->nic_type == athr_l1c || hw->nic_type == athr_l2c) {
82 		AT_READ_REG(hw, REG_PCIE_PHYMISC, &data);
83 		data |= PCIE_PHYMISC_FORCE_RCV_DET;
84 		AT_WRITE_REG(hw, REG_PCIE_PHYMISC, data);
85 	} else { /* new dev set bit5 of MASTER */
86 		if (!(mst_data & MASTER_CTRL_WAKEN_25M))
87 			AT_WRITE_REG(hw, REG_MASTER_CTRL,
88 				mst_data | MASTER_CTRL_WAKEN_25M);
89 	}
90 	/* aspm/PCIE setting only for l2cb 1.0 */
91 	if (hw->nic_type == athr_l2c_b && hw->revision_id == L2CB_V10) {
92 		AT_READ_REG(hw, REG_PCIE_PHYMISC2, &data);
93 		data = FIELD_SETX(data, PCIE_PHYMISC2_CDR_BW,
94 			L2CB1_PCIE_PHYMISC2_CDR_BW);
95 		data = FIELD_SETX(data, PCIE_PHYMISC2_L0S_TH,
96 			L2CB1_PCIE_PHYMISC2_L0S_TH);
97 		AT_WRITE_REG(hw, REG_PCIE_PHYMISC2, data);
98 		/* extend L1 sync timer */
99 		AT_READ_REG(hw, REG_LINK_CTRL, &data);
100 		data |= LINK_CTRL_EXT_SYNC;
101 		AT_WRITE_REG(hw, REG_LINK_CTRL, data);
102 	}
103 	/* l2cb 1.x & l1d 1.x */
104 	if (hw->nic_type == athr_l2c_b || hw->nic_type == athr_l1d) {
105 		AT_READ_REG(hw, REG_PM_CTRL, &data);
106 		data |= PM_CTRL_L0S_BUFSRX_EN;
107 		AT_WRITE_REG(hw, REG_PM_CTRL, data);
108 		/* clear vendor msg */
109 		AT_READ_REG(hw, REG_DMA_DBG, &data);
110 		AT_WRITE_REG(hw, REG_DMA_DBG, data & ~DMA_DBG_VENDOR_MSG);
111 	}
112 }
113 
114 /* FIXME: no need any more ? */
115 /*
116  * atl1c_init_pcie - init PCIE module
117  */
118 static void atl1c_reset_pcie(struct atl1c_hw *hw, u32 flag)
119 {
120 	u32 data;
121 	u32 pci_cmd;
122 	struct pci_dev *pdev = hw->adapter->pdev;
123 	int pos;
124 
125 	AT_READ_REG(hw, PCI_COMMAND, &pci_cmd);
126 	pci_cmd &= ~PCI_COMMAND_INTX_DISABLE;
127 	pci_cmd |= (PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER |
128 		PCI_COMMAND_IO);
129 	AT_WRITE_REG(hw, PCI_COMMAND, pci_cmd);
130 
131 	/*
132 	 * Clear any PowerSaveing Settings
133 	 */
134 	pci_enable_wake(pdev, PCI_D3hot, 0);
135 	pci_enable_wake(pdev, PCI_D3cold, 0);
136 	/* wol sts read-clear */
137 	AT_READ_REG(hw, REG_WOL_CTRL, &data);
138 	AT_WRITE_REG(hw, REG_WOL_CTRL, 0);
139 
140 	/*
141 	 * Mask some pcie error bits
142 	 */
143 	pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_ERR);
144 	if (pos) {
145 		pci_read_config_dword(pdev, pos + PCI_ERR_UNCOR_SEVER, &data);
146 		data &= ~(PCI_ERR_UNC_DLP | PCI_ERR_UNC_FCP);
147 		pci_write_config_dword(pdev, pos + PCI_ERR_UNCOR_SEVER, data);
148 	}
149 	/* clear error status */
150 	pcie_capability_write_word(pdev, PCI_EXP_DEVSTA,
151 			PCI_EXP_DEVSTA_NFED |
152 			PCI_EXP_DEVSTA_FED |
153 			PCI_EXP_DEVSTA_CED |
154 			PCI_EXP_DEVSTA_URD);
155 
156 	AT_READ_REG(hw, REG_LTSSM_ID_CTRL, &data);
157 	data &= ~LTSSM_ID_EN_WRO;
158 	AT_WRITE_REG(hw, REG_LTSSM_ID_CTRL, data);
159 
160 	atl1c_pcie_patch(hw);
161 	if (flag & ATL1C_PCIE_L0S_L1_DISABLE)
162 		atl1c_disable_l0s_l1(hw);
163 
164 	msleep(5);
165 }
166 
167 /**
168  * atl1c_irq_enable - Enable default interrupt generation settings
169  * @adapter: board private structure
170  */
171 static inline void atl1c_irq_enable(struct atl1c_adapter *adapter)
172 {
173 	if (likely(atomic_dec_and_test(&adapter->irq_sem))) {
174 		AT_WRITE_REG(&adapter->hw, REG_ISR, 0x7FFFFFFF);
175 		AT_WRITE_REG(&adapter->hw, REG_IMR, adapter->hw.intr_mask);
176 		AT_WRITE_FLUSH(&adapter->hw);
177 	}
178 }
179 
180 /**
181  * atl1c_irq_disable - Mask off interrupt generation on the NIC
182  * @adapter: board private structure
183  */
184 static inline void atl1c_irq_disable(struct atl1c_adapter *adapter)
185 {
186 	atomic_inc(&adapter->irq_sem);
187 	AT_WRITE_REG(&adapter->hw, REG_IMR, 0);
188 	AT_WRITE_REG(&adapter->hw, REG_ISR, ISR_DIS_INT);
189 	AT_WRITE_FLUSH(&adapter->hw);
190 	synchronize_irq(adapter->pdev->irq);
191 }
192 
193 /**
194  * atl1c_irq_reset - reset interrupt confiure on the NIC
195  * @adapter: board private structure
196  */
197 static inline void atl1c_irq_reset(struct atl1c_adapter *adapter)
198 {
199 	atomic_set(&adapter->irq_sem, 1);
200 	atl1c_irq_enable(adapter);
201 }
202 
203 /*
204  * atl1c_wait_until_idle - wait up to AT_HW_MAX_IDLE_DELAY reads
205  * of the idle status register until the device is actually idle
206  */
207 static u32 atl1c_wait_until_idle(struct atl1c_hw *hw, u32 modu_ctrl)
208 {
209 	int timeout;
210 	u32 data;
211 
212 	for (timeout = 0; timeout < AT_HW_MAX_IDLE_DELAY; timeout++) {
213 		AT_READ_REG(hw, REG_IDLE_STATUS, &data);
214 		if ((data & modu_ctrl) == 0)
215 			return 0;
216 		msleep(1);
217 	}
218 	return data;
219 }
220 
221 /**
222  * atl1c_phy_config - Timer Call-back
223  * @data: pointer to netdev cast into an unsigned long
224  */
225 static void atl1c_phy_config(struct timer_list *t)
226 {
227 	struct atl1c_adapter *adapter = from_timer(adapter, t,
228 						   phy_config_timer);
229 	struct atl1c_hw *hw = &adapter->hw;
230 	unsigned long flags;
231 
232 	spin_lock_irqsave(&adapter->mdio_lock, flags);
233 	atl1c_restart_autoneg(hw);
234 	spin_unlock_irqrestore(&adapter->mdio_lock, flags);
235 }
236 
237 void atl1c_reinit_locked(struct atl1c_adapter *adapter)
238 {
239 	WARN_ON(in_interrupt());
240 	atl1c_down(adapter);
241 	atl1c_up(adapter);
242 	clear_bit(__AT_RESETTING, &adapter->flags);
243 }
244 
245 static void atl1c_check_link_status(struct atl1c_adapter *adapter)
246 {
247 	struct atl1c_hw *hw = &adapter->hw;
248 	struct net_device *netdev = adapter->netdev;
249 	struct pci_dev    *pdev   = adapter->pdev;
250 	int err;
251 	unsigned long flags;
252 	u16 speed, duplex, phy_data;
253 
254 	spin_lock_irqsave(&adapter->mdio_lock, flags);
255 	/* MII_BMSR must read twise */
256 	atl1c_read_phy_reg(hw, MII_BMSR, &phy_data);
257 	atl1c_read_phy_reg(hw, MII_BMSR, &phy_data);
258 	spin_unlock_irqrestore(&adapter->mdio_lock, flags);
259 
260 	if ((phy_data & BMSR_LSTATUS) == 0) {
261 		/* link down */
262 		netif_carrier_off(netdev);
263 		hw->hibernate = true;
264 		if (atl1c_reset_mac(hw) != 0)
265 			if (netif_msg_hw(adapter))
266 				dev_warn(&pdev->dev, "reset mac failed\n");
267 		atl1c_set_aspm(hw, SPEED_0);
268 		atl1c_post_phy_linkchg(hw, SPEED_0);
269 		atl1c_reset_dma_ring(adapter);
270 		atl1c_configure(adapter);
271 	} else {
272 		/* Link Up */
273 		hw->hibernate = false;
274 		spin_lock_irqsave(&adapter->mdio_lock, flags);
275 		err = atl1c_get_speed_and_duplex(hw, &speed, &duplex);
276 		spin_unlock_irqrestore(&adapter->mdio_lock, flags);
277 		if (unlikely(err))
278 			return;
279 		/* link result is our setting */
280 		if (adapter->link_speed != speed ||
281 		    adapter->link_duplex != duplex) {
282 			adapter->link_speed  = speed;
283 			adapter->link_duplex = duplex;
284 			atl1c_set_aspm(hw, speed);
285 			atl1c_post_phy_linkchg(hw, speed);
286 			atl1c_start_mac(adapter);
287 			if (netif_msg_link(adapter))
288 				dev_info(&pdev->dev,
289 					"%s: %s NIC Link is Up<%d Mbps %s>\n",
290 					atl1c_driver_name, netdev->name,
291 					adapter->link_speed,
292 					adapter->link_duplex == FULL_DUPLEX ?
293 					"Full Duplex" : "Half Duplex");
294 		}
295 		if (!netif_carrier_ok(netdev))
296 			netif_carrier_on(netdev);
297 	}
298 }
299 
300 static void atl1c_link_chg_event(struct atl1c_adapter *adapter)
301 {
302 	struct net_device *netdev = adapter->netdev;
303 	struct pci_dev    *pdev   = adapter->pdev;
304 	u16 phy_data;
305 	u16 link_up;
306 
307 	spin_lock(&adapter->mdio_lock);
308 	atl1c_read_phy_reg(&adapter->hw, MII_BMSR, &phy_data);
309 	atl1c_read_phy_reg(&adapter->hw, MII_BMSR, &phy_data);
310 	spin_unlock(&adapter->mdio_lock);
311 	link_up = phy_data & BMSR_LSTATUS;
312 	/* notify upper layer link down ASAP */
313 	if (!link_up) {
314 		if (netif_carrier_ok(netdev)) {
315 			/* old link state: Up */
316 			netif_carrier_off(netdev);
317 			if (netif_msg_link(adapter))
318 				dev_info(&pdev->dev,
319 					"%s: %s NIC Link is Down\n",
320 					atl1c_driver_name, netdev->name);
321 			adapter->link_speed = SPEED_0;
322 		}
323 	}
324 
325 	set_bit(ATL1C_WORK_EVENT_LINK_CHANGE, &adapter->work_event);
326 	schedule_work(&adapter->common_task);
327 }
328 
329 static void atl1c_common_task(struct work_struct *work)
330 {
331 	struct atl1c_adapter *adapter;
332 	struct net_device *netdev;
333 
334 	adapter = container_of(work, struct atl1c_adapter, common_task);
335 	netdev = adapter->netdev;
336 
337 	if (test_bit(__AT_DOWN, &adapter->flags))
338 		return;
339 
340 	if (test_and_clear_bit(ATL1C_WORK_EVENT_RESET, &adapter->work_event)) {
341 		netif_device_detach(netdev);
342 		atl1c_down(adapter);
343 		atl1c_up(adapter);
344 		netif_device_attach(netdev);
345 	}
346 
347 	if (test_and_clear_bit(ATL1C_WORK_EVENT_LINK_CHANGE,
348 		&adapter->work_event)) {
349 		atl1c_irq_disable(adapter);
350 		atl1c_check_link_status(adapter);
351 		atl1c_irq_enable(adapter);
352 	}
353 }
354 
355 
356 static void atl1c_del_timer(struct atl1c_adapter *adapter)
357 {
358 	del_timer_sync(&adapter->phy_config_timer);
359 }
360 
361 
362 /**
363  * atl1c_tx_timeout - Respond to a Tx Hang
364  * @netdev: network interface device structure
365  */
366 static void atl1c_tx_timeout(struct net_device *netdev)
367 {
368 	struct atl1c_adapter *adapter = netdev_priv(netdev);
369 
370 	/* Do the reset outside of interrupt context */
371 	set_bit(ATL1C_WORK_EVENT_RESET, &adapter->work_event);
372 	schedule_work(&adapter->common_task);
373 }
374 
375 /**
376  * atl1c_set_multi - Multicast and Promiscuous mode set
377  * @netdev: network interface device structure
378  *
379  * The set_multi entry point is called whenever the multicast address
380  * list or the network interface flags are updated.  This routine is
381  * responsible for configuring the hardware for proper multicast,
382  * promiscuous mode, and all-multi behavior.
383  */
384 static void atl1c_set_multi(struct net_device *netdev)
385 {
386 	struct atl1c_adapter *adapter = netdev_priv(netdev);
387 	struct atl1c_hw *hw = &adapter->hw;
388 	struct netdev_hw_addr *ha;
389 	u32 mac_ctrl_data;
390 	u32 hash_value;
391 
392 	/* Check for Promiscuous and All Multicast modes */
393 	AT_READ_REG(hw, REG_MAC_CTRL, &mac_ctrl_data);
394 
395 	if (netdev->flags & IFF_PROMISC) {
396 		mac_ctrl_data |= MAC_CTRL_PROMIS_EN;
397 	} else if (netdev->flags & IFF_ALLMULTI) {
398 		mac_ctrl_data |= MAC_CTRL_MC_ALL_EN;
399 		mac_ctrl_data &= ~MAC_CTRL_PROMIS_EN;
400 	} else {
401 		mac_ctrl_data &= ~(MAC_CTRL_PROMIS_EN | MAC_CTRL_MC_ALL_EN);
402 	}
403 
404 	AT_WRITE_REG(hw, REG_MAC_CTRL, mac_ctrl_data);
405 
406 	/* clear the old settings from the multicast hash table */
407 	AT_WRITE_REG(hw, REG_RX_HASH_TABLE, 0);
408 	AT_WRITE_REG_ARRAY(hw, REG_RX_HASH_TABLE, 1, 0);
409 
410 	/* comoute mc addresses' hash value ,and put it into hash table */
411 	netdev_for_each_mc_addr(ha, netdev) {
412 		hash_value = atl1c_hash_mc_addr(hw, ha->addr);
413 		atl1c_hash_set(hw, hash_value);
414 	}
415 }
416 
417 static void __atl1c_vlan_mode(netdev_features_t features, u32 *mac_ctrl_data)
418 {
419 	if (features & NETIF_F_HW_VLAN_CTAG_RX) {
420 		/* enable VLAN tag insert/strip */
421 		*mac_ctrl_data |= MAC_CTRL_RMV_VLAN;
422 	} else {
423 		/* disable VLAN tag insert/strip */
424 		*mac_ctrl_data &= ~MAC_CTRL_RMV_VLAN;
425 	}
426 }
427 
428 static void atl1c_vlan_mode(struct net_device *netdev,
429 	netdev_features_t features)
430 {
431 	struct atl1c_adapter *adapter = netdev_priv(netdev);
432 	struct pci_dev *pdev = adapter->pdev;
433 	u32 mac_ctrl_data = 0;
434 
435 	if (netif_msg_pktdata(adapter))
436 		dev_dbg(&pdev->dev, "atl1c_vlan_mode\n");
437 
438 	atl1c_irq_disable(adapter);
439 	AT_READ_REG(&adapter->hw, REG_MAC_CTRL, &mac_ctrl_data);
440 	__atl1c_vlan_mode(features, &mac_ctrl_data);
441 	AT_WRITE_REG(&adapter->hw, REG_MAC_CTRL, mac_ctrl_data);
442 	atl1c_irq_enable(adapter);
443 }
444 
445 static void atl1c_restore_vlan(struct atl1c_adapter *adapter)
446 {
447 	struct pci_dev *pdev = adapter->pdev;
448 
449 	if (netif_msg_pktdata(adapter))
450 		dev_dbg(&pdev->dev, "atl1c_restore_vlan\n");
451 	atl1c_vlan_mode(adapter->netdev, adapter->netdev->features);
452 }
453 
454 /**
455  * atl1c_set_mac - Change the Ethernet Address of the NIC
456  * @netdev: network interface device structure
457  * @p: pointer to an address structure
458  *
459  * Returns 0 on success, negative on failure
460  */
461 static int atl1c_set_mac_addr(struct net_device *netdev, void *p)
462 {
463 	struct atl1c_adapter *adapter = netdev_priv(netdev);
464 	struct sockaddr *addr = p;
465 
466 	if (!is_valid_ether_addr(addr->sa_data))
467 		return -EADDRNOTAVAIL;
468 
469 	if (netif_running(netdev))
470 		return -EBUSY;
471 
472 	memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
473 	memcpy(adapter->hw.mac_addr, addr->sa_data, netdev->addr_len);
474 
475 	atl1c_hw_set_mac_addr(&adapter->hw, adapter->hw.mac_addr);
476 
477 	return 0;
478 }
479 
480 static void atl1c_set_rxbufsize(struct atl1c_adapter *adapter,
481 				struct net_device *dev)
482 {
483 	unsigned int head_size;
484 	int mtu = dev->mtu;
485 
486 	adapter->rx_buffer_len = mtu > AT_RX_BUF_SIZE ?
487 		roundup(mtu + ETH_HLEN + ETH_FCS_LEN + VLAN_HLEN, 8) : AT_RX_BUF_SIZE;
488 
489 	head_size = SKB_DATA_ALIGN(adapter->rx_buffer_len + NET_SKB_PAD) +
490 		    SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
491 	adapter->rx_frag_size = roundup_pow_of_two(head_size);
492 }
493 
494 static netdev_features_t atl1c_fix_features(struct net_device *netdev,
495 	netdev_features_t features)
496 {
497 	/*
498 	 * Since there is no support for separate rx/tx vlan accel
499 	 * enable/disable make sure tx flag is always in same state as rx.
500 	 */
501 	if (features & NETIF_F_HW_VLAN_CTAG_RX)
502 		features |= NETIF_F_HW_VLAN_CTAG_TX;
503 	else
504 		features &= ~NETIF_F_HW_VLAN_CTAG_TX;
505 
506 	if (netdev->mtu > MAX_TSO_FRAME_SIZE)
507 		features &= ~(NETIF_F_TSO | NETIF_F_TSO6);
508 
509 	return features;
510 }
511 
512 static int atl1c_set_features(struct net_device *netdev,
513 	netdev_features_t features)
514 {
515 	netdev_features_t changed = netdev->features ^ features;
516 
517 	if (changed & NETIF_F_HW_VLAN_CTAG_RX)
518 		atl1c_vlan_mode(netdev, features);
519 
520 	return 0;
521 }
522 
523 static void atl1c_set_max_mtu(struct net_device *netdev)
524 {
525 	struct atl1c_adapter *adapter = netdev_priv(netdev);
526 	struct atl1c_hw *hw = &adapter->hw;
527 
528 	switch (hw->nic_type) {
529 	/* These (GbE) devices support jumbo packets, max_mtu 6122 */
530 	case athr_l1c:
531 	case athr_l1d:
532 	case athr_l1d_2:
533 		netdev->max_mtu = MAX_JUMBO_FRAME_SIZE -
534 				  (ETH_HLEN + ETH_FCS_LEN + VLAN_HLEN);
535 		break;
536 	/* The 10/100 devices don't support jumbo packets, max_mtu 1500 */
537 	default:
538 		netdev->max_mtu = ETH_DATA_LEN;
539 		break;
540 	}
541 }
542 
543 /**
544  * atl1c_change_mtu - Change the Maximum Transfer Unit
545  * @netdev: network interface device structure
546  * @new_mtu: new value for maximum frame size
547  *
548  * Returns 0 on success, negative on failure
549  */
550 static int atl1c_change_mtu(struct net_device *netdev, int new_mtu)
551 {
552 	struct atl1c_adapter *adapter = netdev_priv(netdev);
553 
554 	/* set MTU */
555 	if (netif_running(netdev)) {
556 		while (test_and_set_bit(__AT_RESETTING, &adapter->flags))
557 			msleep(1);
558 		netdev->mtu = new_mtu;
559 		adapter->hw.max_frame_size = new_mtu;
560 		atl1c_set_rxbufsize(adapter, netdev);
561 		atl1c_down(adapter);
562 		netdev_update_features(netdev);
563 		atl1c_up(adapter);
564 		clear_bit(__AT_RESETTING, &adapter->flags);
565 	}
566 	return 0;
567 }
568 
569 /*
570  *  caller should hold mdio_lock
571  */
572 static int atl1c_mdio_read(struct net_device *netdev, int phy_id, int reg_num)
573 {
574 	struct atl1c_adapter *adapter = netdev_priv(netdev);
575 	u16 result;
576 
577 	atl1c_read_phy_reg(&adapter->hw, reg_num, &result);
578 	return result;
579 }
580 
581 static void atl1c_mdio_write(struct net_device *netdev, int phy_id,
582 			     int reg_num, int val)
583 {
584 	struct atl1c_adapter *adapter = netdev_priv(netdev);
585 
586 	atl1c_write_phy_reg(&adapter->hw, reg_num, val);
587 }
588 
589 static int atl1c_mii_ioctl(struct net_device *netdev,
590 			   struct ifreq *ifr, int cmd)
591 {
592 	struct atl1c_adapter *adapter = netdev_priv(netdev);
593 	struct pci_dev *pdev = adapter->pdev;
594 	struct mii_ioctl_data *data = if_mii(ifr);
595 	unsigned long flags;
596 	int retval = 0;
597 
598 	if (!netif_running(netdev))
599 		return -EINVAL;
600 
601 	spin_lock_irqsave(&adapter->mdio_lock, flags);
602 	switch (cmd) {
603 	case SIOCGMIIPHY:
604 		data->phy_id = 0;
605 		break;
606 
607 	case SIOCGMIIREG:
608 		if (atl1c_read_phy_reg(&adapter->hw, data->reg_num & 0x1F,
609 				    &data->val_out)) {
610 			retval = -EIO;
611 			goto out;
612 		}
613 		break;
614 
615 	case SIOCSMIIREG:
616 		if (data->reg_num & ~(0x1F)) {
617 			retval = -EFAULT;
618 			goto out;
619 		}
620 
621 		dev_dbg(&pdev->dev, "<atl1c_mii_ioctl> write %x %x",
622 				data->reg_num, data->val_in);
623 		if (atl1c_write_phy_reg(&adapter->hw,
624 				     data->reg_num, data->val_in)) {
625 			retval = -EIO;
626 			goto out;
627 		}
628 		break;
629 
630 	default:
631 		retval = -EOPNOTSUPP;
632 		break;
633 	}
634 out:
635 	spin_unlock_irqrestore(&adapter->mdio_lock, flags);
636 	return retval;
637 }
638 
639 static int atl1c_ioctl(struct net_device *netdev, struct ifreq *ifr, int cmd)
640 {
641 	switch (cmd) {
642 	case SIOCGMIIPHY:
643 	case SIOCGMIIREG:
644 	case SIOCSMIIREG:
645 		return atl1c_mii_ioctl(netdev, ifr, cmd);
646 	default:
647 		return -EOPNOTSUPP;
648 	}
649 }
650 
651 /**
652  * atl1c_alloc_queues - Allocate memory for all rings
653  * @adapter: board private structure to initialize
654  *
655  */
656 static int atl1c_alloc_queues(struct atl1c_adapter *adapter)
657 {
658 	return 0;
659 }
660 
661 static void atl1c_set_mac_type(struct atl1c_hw *hw)
662 {
663 	switch (hw->device_id) {
664 	case PCI_DEVICE_ID_ATTANSIC_L2C:
665 		hw->nic_type = athr_l2c;
666 		break;
667 	case PCI_DEVICE_ID_ATTANSIC_L1C:
668 		hw->nic_type = athr_l1c;
669 		break;
670 	case PCI_DEVICE_ID_ATHEROS_L2C_B:
671 		hw->nic_type = athr_l2c_b;
672 		break;
673 	case PCI_DEVICE_ID_ATHEROS_L2C_B2:
674 		hw->nic_type = athr_l2c_b2;
675 		break;
676 	case PCI_DEVICE_ID_ATHEROS_L1D:
677 		hw->nic_type = athr_l1d;
678 		break;
679 	case PCI_DEVICE_ID_ATHEROS_L1D_2_0:
680 		hw->nic_type = athr_l1d_2;
681 		break;
682 	default:
683 		break;
684 	}
685 }
686 
687 static int atl1c_setup_mac_funcs(struct atl1c_hw *hw)
688 {
689 	u32 link_ctrl_data;
690 
691 	atl1c_set_mac_type(hw);
692 	AT_READ_REG(hw, REG_LINK_CTRL, &link_ctrl_data);
693 
694 	hw->ctrl_flags = ATL1C_INTR_MODRT_ENABLE  |
695 			 ATL1C_TXQ_MODE_ENHANCE;
696 	hw->ctrl_flags |= ATL1C_ASPM_L0S_SUPPORT |
697 			  ATL1C_ASPM_L1_SUPPORT;
698 	hw->ctrl_flags |= ATL1C_ASPM_CTRL_MON;
699 
700 	if (hw->nic_type == athr_l1c ||
701 	    hw->nic_type == athr_l1d ||
702 	    hw->nic_type == athr_l1d_2)
703 		hw->link_cap_flags |= ATL1C_LINK_CAP_1000M;
704 	return 0;
705 }
706 
707 struct atl1c_platform_patch {
708 	u16 pci_did;
709 	u8  pci_revid;
710 	u16 subsystem_vid;
711 	u16 subsystem_did;
712 	u32 patch_flag;
713 #define ATL1C_LINK_PATCH	0x1
714 };
715 static const struct atl1c_platform_patch plats[] = {
716 {0x2060, 0xC1, 0x1019, 0x8152, 0x1},
717 {0x2060, 0xC1, 0x1019, 0x2060, 0x1},
718 {0x2060, 0xC1, 0x1019, 0xE000, 0x1},
719 {0x2062, 0xC0, 0x1019, 0x8152, 0x1},
720 {0x2062, 0xC0, 0x1019, 0x2062, 0x1},
721 {0x2062, 0xC0, 0x1458, 0xE000, 0x1},
722 {0x2062, 0xC1, 0x1019, 0x8152, 0x1},
723 {0x2062, 0xC1, 0x1019, 0x2062, 0x1},
724 {0x2062, 0xC1, 0x1458, 0xE000, 0x1},
725 {0x2062, 0xC1, 0x1565, 0x2802, 0x1},
726 {0x2062, 0xC1, 0x1565, 0x2801, 0x1},
727 {0x1073, 0xC0, 0x1019, 0x8151, 0x1},
728 {0x1073, 0xC0, 0x1019, 0x1073, 0x1},
729 {0x1073, 0xC0, 0x1458, 0xE000, 0x1},
730 {0x1083, 0xC0, 0x1458, 0xE000, 0x1},
731 {0x1083, 0xC0, 0x1019, 0x8151, 0x1},
732 {0x1083, 0xC0, 0x1019, 0x1083, 0x1},
733 {0x1083, 0xC0, 0x1462, 0x7680, 0x1},
734 {0x1083, 0xC0, 0x1565, 0x2803, 0x1},
735 {0},
736 };
737 
738 static void atl1c_patch_assign(struct atl1c_hw *hw)
739 {
740 	struct pci_dev	*pdev = hw->adapter->pdev;
741 	u32 misc_ctrl;
742 	int i = 0;
743 
744 	hw->msi_lnkpatch = false;
745 
746 	while (plats[i].pci_did != 0) {
747 		if (plats[i].pci_did == hw->device_id &&
748 		    plats[i].pci_revid == hw->revision_id &&
749 		    plats[i].subsystem_vid == hw->subsystem_vendor_id &&
750 		    plats[i].subsystem_did == hw->subsystem_id) {
751 			if (plats[i].patch_flag & ATL1C_LINK_PATCH)
752 				hw->msi_lnkpatch = true;
753 		}
754 		i++;
755 	}
756 
757 	if (hw->device_id == PCI_DEVICE_ID_ATHEROS_L2C_B2 &&
758 	    hw->revision_id == L2CB_V21) {
759 		/* config access mode */
760 		pci_write_config_dword(pdev, REG_PCIE_IND_ACC_ADDR,
761 				       REG_PCIE_DEV_MISC_CTRL);
762 		pci_read_config_dword(pdev, REG_PCIE_IND_ACC_DATA, &misc_ctrl);
763 		misc_ctrl &= ~0x100;
764 		pci_write_config_dword(pdev, REG_PCIE_IND_ACC_ADDR,
765 				       REG_PCIE_DEV_MISC_CTRL);
766 		pci_write_config_dword(pdev, REG_PCIE_IND_ACC_DATA, misc_ctrl);
767 	}
768 }
769 /**
770  * atl1c_sw_init - Initialize general software structures (struct atl1c_adapter)
771  * @adapter: board private structure to initialize
772  *
773  * atl1c_sw_init initializes the Adapter private data structure.
774  * Fields are initialized based on PCI device information and
775  * OS network device settings (MTU size).
776  */
777 static int atl1c_sw_init(struct atl1c_adapter *adapter)
778 {
779 	struct atl1c_hw *hw   = &adapter->hw;
780 	struct pci_dev	*pdev = adapter->pdev;
781 	u32 revision;
782 
783 
784 	adapter->wol = 0;
785 	device_set_wakeup_enable(&pdev->dev, false);
786 	adapter->link_speed = SPEED_0;
787 	adapter->link_duplex = FULL_DUPLEX;
788 	adapter->tpd_ring[0].count = 1024;
789 	adapter->rfd_ring.count = 512;
790 
791 	hw->vendor_id = pdev->vendor;
792 	hw->device_id = pdev->device;
793 	hw->subsystem_vendor_id = pdev->subsystem_vendor;
794 	hw->subsystem_id = pdev->subsystem_device;
795 	pci_read_config_dword(pdev, PCI_CLASS_REVISION, &revision);
796 	hw->revision_id = revision & 0xFF;
797 	/* before link up, we assume hibernate is true */
798 	hw->hibernate = true;
799 	hw->media_type = MEDIA_TYPE_AUTO_SENSOR;
800 	if (atl1c_setup_mac_funcs(hw) != 0) {
801 		dev_err(&pdev->dev, "set mac function pointers failed\n");
802 		return -1;
803 	}
804 	atl1c_patch_assign(hw);
805 
806 	hw->intr_mask = IMR_NORMAL_MASK;
807 	hw->phy_configured = false;
808 	hw->preamble_len = 7;
809 	hw->max_frame_size = adapter->netdev->mtu;
810 	hw->autoneg_advertised = ADVERTISED_Autoneg;
811 	hw->indirect_tab = 0xE4E4E4E4;
812 	hw->base_cpu = 0;
813 
814 	hw->ict = 50000;		/* 100ms */
815 	hw->smb_timer = 200000;	  	/* 400ms */
816 	hw->rx_imt = 200;
817 	hw->tx_imt = 1000;
818 
819 	hw->tpd_burst = 5;
820 	hw->rfd_burst = 8;
821 	hw->dma_order = atl1c_dma_ord_out;
822 	hw->dmar_block = atl1c_dma_req_1024;
823 
824 	if (atl1c_alloc_queues(adapter)) {
825 		dev_err(&pdev->dev, "Unable to allocate memory for queues\n");
826 		return -ENOMEM;
827 	}
828 	/* TODO */
829 	atl1c_set_rxbufsize(adapter, adapter->netdev);
830 	atomic_set(&adapter->irq_sem, 1);
831 	spin_lock_init(&adapter->mdio_lock);
832 	set_bit(__AT_DOWN, &adapter->flags);
833 
834 	return 0;
835 }
836 
837 static inline void atl1c_clean_buffer(struct pci_dev *pdev,
838 				struct atl1c_buffer *buffer_info)
839 {
840 	u16 pci_driection;
841 	if (buffer_info->flags & ATL1C_BUFFER_FREE)
842 		return;
843 	if (buffer_info->dma) {
844 		if (buffer_info->flags & ATL1C_PCIMAP_FROMDEVICE)
845 			pci_driection = PCI_DMA_FROMDEVICE;
846 		else
847 			pci_driection = PCI_DMA_TODEVICE;
848 
849 		if (buffer_info->flags & ATL1C_PCIMAP_SINGLE)
850 			pci_unmap_single(pdev, buffer_info->dma,
851 					buffer_info->length, pci_driection);
852 		else if (buffer_info->flags & ATL1C_PCIMAP_PAGE)
853 			pci_unmap_page(pdev, buffer_info->dma,
854 					buffer_info->length, pci_driection);
855 	}
856 	if (buffer_info->skb)
857 		dev_consume_skb_any(buffer_info->skb);
858 	buffer_info->dma = 0;
859 	buffer_info->skb = NULL;
860 	ATL1C_SET_BUFFER_STATE(buffer_info, ATL1C_BUFFER_FREE);
861 }
862 /**
863  * atl1c_clean_tx_ring - Free Tx-skb
864  * @adapter: board private structure
865  */
866 static void atl1c_clean_tx_ring(struct atl1c_adapter *adapter,
867 				enum atl1c_trans_queue type)
868 {
869 	struct atl1c_tpd_ring *tpd_ring = &adapter->tpd_ring[type];
870 	struct atl1c_buffer *buffer_info;
871 	struct pci_dev *pdev = adapter->pdev;
872 	u16 index, ring_count;
873 
874 	ring_count = tpd_ring->count;
875 	for (index = 0; index < ring_count; index++) {
876 		buffer_info = &tpd_ring->buffer_info[index];
877 		atl1c_clean_buffer(pdev, buffer_info);
878 	}
879 
880 	netdev_reset_queue(adapter->netdev);
881 
882 	/* Zero out Tx-buffers */
883 	memset(tpd_ring->desc, 0, sizeof(struct atl1c_tpd_desc) *
884 		ring_count);
885 	atomic_set(&tpd_ring->next_to_clean, 0);
886 	tpd_ring->next_to_use = 0;
887 }
888 
889 /**
890  * atl1c_clean_rx_ring - Free rx-reservation skbs
891  * @adapter: board private structure
892  */
893 static void atl1c_clean_rx_ring(struct atl1c_adapter *adapter)
894 {
895 	struct atl1c_rfd_ring *rfd_ring = &adapter->rfd_ring;
896 	struct atl1c_rrd_ring *rrd_ring = &adapter->rrd_ring;
897 	struct atl1c_buffer *buffer_info;
898 	struct pci_dev *pdev = adapter->pdev;
899 	int j;
900 
901 	for (j = 0; j < rfd_ring->count; j++) {
902 		buffer_info = &rfd_ring->buffer_info[j];
903 		atl1c_clean_buffer(pdev, buffer_info);
904 	}
905 	/* zero out the descriptor ring */
906 	memset(rfd_ring->desc, 0, rfd_ring->size);
907 	rfd_ring->next_to_clean = 0;
908 	rfd_ring->next_to_use = 0;
909 	rrd_ring->next_to_use = 0;
910 	rrd_ring->next_to_clean = 0;
911 }
912 
913 /*
914  * Read / Write Ptr Initialize:
915  */
916 static void atl1c_init_ring_ptrs(struct atl1c_adapter *adapter)
917 {
918 	struct atl1c_tpd_ring *tpd_ring = adapter->tpd_ring;
919 	struct atl1c_rfd_ring *rfd_ring = &adapter->rfd_ring;
920 	struct atl1c_rrd_ring *rrd_ring = &adapter->rrd_ring;
921 	struct atl1c_buffer *buffer_info;
922 	int i, j;
923 
924 	for (i = 0; i < AT_MAX_TRANSMIT_QUEUE; i++) {
925 		tpd_ring[i].next_to_use = 0;
926 		atomic_set(&tpd_ring[i].next_to_clean, 0);
927 		buffer_info = tpd_ring[i].buffer_info;
928 		for (j = 0; j < tpd_ring->count; j++)
929 			ATL1C_SET_BUFFER_STATE(&buffer_info[i],
930 					ATL1C_BUFFER_FREE);
931 	}
932 	rfd_ring->next_to_use = 0;
933 	rfd_ring->next_to_clean = 0;
934 	rrd_ring->next_to_use = 0;
935 	rrd_ring->next_to_clean = 0;
936 	for (j = 0; j < rfd_ring->count; j++) {
937 		buffer_info = &rfd_ring->buffer_info[j];
938 		ATL1C_SET_BUFFER_STATE(buffer_info, ATL1C_BUFFER_FREE);
939 	}
940 }
941 
942 /**
943  * atl1c_free_ring_resources - Free Tx / RX descriptor Resources
944  * @adapter: board private structure
945  *
946  * Free all transmit software resources
947  */
948 static void atl1c_free_ring_resources(struct atl1c_adapter *adapter)
949 {
950 	struct pci_dev *pdev = adapter->pdev;
951 
952 	pci_free_consistent(pdev, adapter->ring_header.size,
953 					adapter->ring_header.desc,
954 					adapter->ring_header.dma);
955 	adapter->ring_header.desc = NULL;
956 
957 	/* Note: just free tdp_ring.buffer_info,
958 	*  it contain rfd_ring.buffer_info, do not double free */
959 	if (adapter->tpd_ring[0].buffer_info) {
960 		kfree(adapter->tpd_ring[0].buffer_info);
961 		adapter->tpd_ring[0].buffer_info = NULL;
962 	}
963 	if (adapter->rx_page) {
964 		put_page(adapter->rx_page);
965 		adapter->rx_page = NULL;
966 	}
967 }
968 
969 /**
970  * atl1c_setup_mem_resources - allocate Tx / RX descriptor resources
971  * @adapter: board private structure
972  *
973  * Return 0 on success, negative on failure
974  */
975 static int atl1c_setup_ring_resources(struct atl1c_adapter *adapter)
976 {
977 	struct pci_dev *pdev = adapter->pdev;
978 	struct atl1c_tpd_ring *tpd_ring = adapter->tpd_ring;
979 	struct atl1c_rfd_ring *rfd_ring = &adapter->rfd_ring;
980 	struct atl1c_rrd_ring *rrd_ring = &adapter->rrd_ring;
981 	struct atl1c_ring_header *ring_header = &adapter->ring_header;
982 	int size;
983 	int i;
984 	int count = 0;
985 	int rx_desc_count = 0;
986 	u32 offset = 0;
987 
988 	rrd_ring->count = rfd_ring->count;
989 	for (i = 1; i < AT_MAX_TRANSMIT_QUEUE; i++)
990 		tpd_ring[i].count = tpd_ring[0].count;
991 
992 	/* 2 tpd queue, one high priority queue,
993 	 * another normal priority queue */
994 	size = sizeof(struct atl1c_buffer) * (tpd_ring->count * 2 +
995 		rfd_ring->count);
996 	tpd_ring->buffer_info = kzalloc(size, GFP_KERNEL);
997 	if (unlikely(!tpd_ring->buffer_info))
998 		goto err_nomem;
999 
1000 	for (i = 0; i < AT_MAX_TRANSMIT_QUEUE; i++) {
1001 		tpd_ring[i].buffer_info =
1002 			(tpd_ring->buffer_info + count);
1003 		count += tpd_ring[i].count;
1004 	}
1005 
1006 	rfd_ring->buffer_info =
1007 		(tpd_ring->buffer_info + count);
1008 	count += rfd_ring->count;
1009 	rx_desc_count += rfd_ring->count;
1010 
1011 	/*
1012 	 * real ring DMA buffer
1013 	 * each ring/block may need up to 8 bytes for alignment, hence the
1014 	 * additional bytes tacked onto the end.
1015 	 */
1016 	ring_header->size = size =
1017 		sizeof(struct atl1c_tpd_desc) * tpd_ring->count * 2 +
1018 		sizeof(struct atl1c_rx_free_desc) * rx_desc_count +
1019 		sizeof(struct atl1c_recv_ret_status) * rx_desc_count +
1020 		8 * 4;
1021 
1022 	ring_header->desc = dma_zalloc_coherent(&pdev->dev, ring_header->size,
1023 						&ring_header->dma, GFP_KERNEL);
1024 	if (unlikely(!ring_header->desc)) {
1025 		dev_err(&pdev->dev, "could not get memory for DMA buffer\n");
1026 		goto err_nomem;
1027 	}
1028 	/* init TPD ring */
1029 
1030 	tpd_ring[0].dma = roundup(ring_header->dma, 8);
1031 	offset = tpd_ring[0].dma - ring_header->dma;
1032 	for (i = 0; i < AT_MAX_TRANSMIT_QUEUE; i++) {
1033 		tpd_ring[i].dma = ring_header->dma + offset;
1034 		tpd_ring[i].desc = (u8 *) ring_header->desc + offset;
1035 		tpd_ring[i].size =
1036 			sizeof(struct atl1c_tpd_desc) * tpd_ring[i].count;
1037 		offset += roundup(tpd_ring[i].size, 8);
1038 	}
1039 	/* init RFD ring */
1040 	rfd_ring->dma = ring_header->dma + offset;
1041 	rfd_ring->desc = (u8 *) ring_header->desc + offset;
1042 	rfd_ring->size = sizeof(struct atl1c_rx_free_desc) * rfd_ring->count;
1043 	offset += roundup(rfd_ring->size, 8);
1044 
1045 	/* init RRD ring */
1046 	rrd_ring->dma = ring_header->dma + offset;
1047 	rrd_ring->desc = (u8 *) ring_header->desc + offset;
1048 	rrd_ring->size = sizeof(struct atl1c_recv_ret_status) *
1049 		rrd_ring->count;
1050 	offset += roundup(rrd_ring->size, 8);
1051 
1052 	return 0;
1053 
1054 err_nomem:
1055 	kfree(tpd_ring->buffer_info);
1056 	return -ENOMEM;
1057 }
1058 
1059 static void atl1c_configure_des_ring(struct atl1c_adapter *adapter)
1060 {
1061 	struct atl1c_hw *hw = &adapter->hw;
1062 	struct atl1c_rfd_ring *rfd_ring = &adapter->rfd_ring;
1063 	struct atl1c_rrd_ring *rrd_ring = &adapter->rrd_ring;
1064 	struct atl1c_tpd_ring *tpd_ring = (struct atl1c_tpd_ring *)
1065 				adapter->tpd_ring;
1066 
1067 	/* TPD */
1068 	AT_WRITE_REG(hw, REG_TX_BASE_ADDR_HI,
1069 			(u32)((tpd_ring[atl1c_trans_normal].dma &
1070 				AT_DMA_HI_ADDR_MASK) >> 32));
1071 	/* just enable normal priority TX queue */
1072 	AT_WRITE_REG(hw, REG_TPD_PRI0_ADDR_LO,
1073 			(u32)(tpd_ring[atl1c_trans_normal].dma &
1074 				AT_DMA_LO_ADDR_MASK));
1075 	AT_WRITE_REG(hw, REG_TPD_PRI1_ADDR_LO,
1076 			(u32)(tpd_ring[atl1c_trans_high].dma &
1077 				AT_DMA_LO_ADDR_MASK));
1078 	AT_WRITE_REG(hw, REG_TPD_RING_SIZE,
1079 			(u32)(tpd_ring[0].count & TPD_RING_SIZE_MASK));
1080 
1081 
1082 	/* RFD */
1083 	AT_WRITE_REG(hw, REG_RX_BASE_ADDR_HI,
1084 			(u32)((rfd_ring->dma & AT_DMA_HI_ADDR_MASK) >> 32));
1085 	AT_WRITE_REG(hw, REG_RFD0_HEAD_ADDR_LO,
1086 			(u32)(rfd_ring->dma & AT_DMA_LO_ADDR_MASK));
1087 
1088 	AT_WRITE_REG(hw, REG_RFD_RING_SIZE,
1089 			rfd_ring->count & RFD_RING_SIZE_MASK);
1090 	AT_WRITE_REG(hw, REG_RX_BUF_SIZE,
1091 			adapter->rx_buffer_len & RX_BUF_SIZE_MASK);
1092 
1093 	/* RRD */
1094 	AT_WRITE_REG(hw, REG_RRD0_HEAD_ADDR_LO,
1095 			(u32)(rrd_ring->dma & AT_DMA_LO_ADDR_MASK));
1096 	AT_WRITE_REG(hw, REG_RRD_RING_SIZE,
1097 			(rrd_ring->count & RRD_RING_SIZE_MASK));
1098 
1099 	if (hw->nic_type == athr_l2c_b) {
1100 		AT_WRITE_REG(hw, REG_SRAM_RXF_LEN, 0x02a0L);
1101 		AT_WRITE_REG(hw, REG_SRAM_TXF_LEN, 0x0100L);
1102 		AT_WRITE_REG(hw, REG_SRAM_RXF_ADDR, 0x029f0000L);
1103 		AT_WRITE_REG(hw, REG_SRAM_RFD0_INFO, 0x02bf02a0L);
1104 		AT_WRITE_REG(hw, REG_SRAM_TXF_ADDR, 0x03bf02c0L);
1105 		AT_WRITE_REG(hw, REG_SRAM_TRD_ADDR, 0x03df03c0L);
1106 		AT_WRITE_REG(hw, REG_TXF_WATER_MARK, 0);	/* TX watermark, to enter l1 state.*/
1107 		AT_WRITE_REG(hw, REG_RXD_DMA_CTRL, 0);		/* RXD threshold.*/
1108 	}
1109 	/* Load all of base address above */
1110 	AT_WRITE_REG(hw, REG_LOAD_PTR, 1);
1111 }
1112 
1113 static void atl1c_configure_tx(struct atl1c_adapter *adapter)
1114 {
1115 	struct atl1c_hw *hw = &adapter->hw;
1116 	int max_pay_load;
1117 	u16 tx_offload_thresh;
1118 	u32 txq_ctrl_data;
1119 
1120 	tx_offload_thresh = MAX_TSO_FRAME_SIZE;
1121 	AT_WRITE_REG(hw, REG_TX_TSO_OFFLOAD_THRESH,
1122 		(tx_offload_thresh >> 3) & TX_TSO_OFFLOAD_THRESH_MASK);
1123 	max_pay_load = pcie_get_readrq(adapter->pdev) >> 8;
1124 	hw->dmar_block = min_t(u32, max_pay_load, hw->dmar_block);
1125 	/*
1126 	 * if BIOS had changed the dam-read-max-length to an invalid value,
1127 	 * restore it to default value
1128 	 */
1129 	if (hw->dmar_block < DEVICE_CTRL_MAXRRS_MIN) {
1130 		pcie_set_readrq(adapter->pdev, 128 << DEVICE_CTRL_MAXRRS_MIN);
1131 		hw->dmar_block = DEVICE_CTRL_MAXRRS_MIN;
1132 	}
1133 	txq_ctrl_data =
1134 		hw->nic_type == athr_l2c_b || hw->nic_type == athr_l2c_b2 ?
1135 		L2CB_TXQ_CFGV : L1C_TXQ_CFGV;
1136 
1137 	AT_WRITE_REG(hw, REG_TXQ_CTRL, txq_ctrl_data);
1138 }
1139 
1140 static void atl1c_configure_rx(struct atl1c_adapter *adapter)
1141 {
1142 	struct atl1c_hw *hw = &adapter->hw;
1143 	u32 rxq_ctrl_data;
1144 
1145 	rxq_ctrl_data = (hw->rfd_burst & RXQ_RFD_BURST_NUM_MASK) <<
1146 			RXQ_RFD_BURST_NUM_SHIFT;
1147 
1148 	if (hw->ctrl_flags & ATL1C_RX_IPV6_CHKSUM)
1149 		rxq_ctrl_data |= IPV6_CHKSUM_CTRL_EN;
1150 
1151 	/* aspm for gigabit */
1152 	if (hw->nic_type != athr_l1d_2 && (hw->device_id & 1) != 0)
1153 		rxq_ctrl_data = FIELD_SETX(rxq_ctrl_data, ASPM_THRUPUT_LIMIT,
1154 			ASPM_THRUPUT_LIMIT_100M);
1155 
1156 	AT_WRITE_REG(hw, REG_RXQ_CTRL, rxq_ctrl_data);
1157 }
1158 
1159 static void atl1c_configure_dma(struct atl1c_adapter *adapter)
1160 {
1161 	struct atl1c_hw *hw = &adapter->hw;
1162 	u32 dma_ctrl_data;
1163 
1164 	dma_ctrl_data = FIELDX(DMA_CTRL_RORDER_MODE, DMA_CTRL_RORDER_MODE_OUT) |
1165 		DMA_CTRL_RREQ_PRI_DATA |
1166 		FIELDX(DMA_CTRL_RREQ_BLEN, hw->dmar_block) |
1167 		FIELDX(DMA_CTRL_WDLY_CNT, DMA_CTRL_WDLY_CNT_DEF) |
1168 		FIELDX(DMA_CTRL_RDLY_CNT, DMA_CTRL_RDLY_CNT_DEF);
1169 
1170 	AT_WRITE_REG(hw, REG_DMA_CTRL, dma_ctrl_data);
1171 }
1172 
1173 /*
1174  * Stop the mac, transmit and receive units
1175  * hw - Struct containing variables accessed by shared code
1176  * return : 0  or  idle status (if error)
1177  */
1178 static int atl1c_stop_mac(struct atl1c_hw *hw)
1179 {
1180 	u32 data;
1181 
1182 	AT_READ_REG(hw, REG_RXQ_CTRL, &data);
1183 	data &= ~RXQ_CTRL_EN;
1184 	AT_WRITE_REG(hw, REG_RXQ_CTRL, data);
1185 
1186 	AT_READ_REG(hw, REG_TXQ_CTRL, &data);
1187 	data &= ~TXQ_CTRL_EN;
1188 	AT_WRITE_REG(hw, REG_TXQ_CTRL, data);
1189 
1190 	atl1c_wait_until_idle(hw, IDLE_STATUS_RXQ_BUSY | IDLE_STATUS_TXQ_BUSY);
1191 
1192 	AT_READ_REG(hw, REG_MAC_CTRL, &data);
1193 	data &= ~(MAC_CTRL_TX_EN | MAC_CTRL_RX_EN);
1194 	AT_WRITE_REG(hw, REG_MAC_CTRL, data);
1195 
1196 	return (int)atl1c_wait_until_idle(hw,
1197 		IDLE_STATUS_TXMAC_BUSY | IDLE_STATUS_RXMAC_BUSY);
1198 }
1199 
1200 static void atl1c_start_mac(struct atl1c_adapter *adapter)
1201 {
1202 	struct atl1c_hw *hw = &adapter->hw;
1203 	u32 mac, txq, rxq;
1204 
1205 	hw->mac_duplex = adapter->link_duplex == FULL_DUPLEX ? true : false;
1206 	hw->mac_speed = adapter->link_speed == SPEED_1000 ?
1207 		atl1c_mac_speed_1000 : atl1c_mac_speed_10_100;
1208 
1209 	AT_READ_REG(hw, REG_TXQ_CTRL, &txq);
1210 	AT_READ_REG(hw, REG_RXQ_CTRL, &rxq);
1211 	AT_READ_REG(hw, REG_MAC_CTRL, &mac);
1212 
1213 	txq |= TXQ_CTRL_EN;
1214 	rxq |= RXQ_CTRL_EN;
1215 	mac |= MAC_CTRL_TX_EN | MAC_CTRL_TX_FLOW |
1216 	       MAC_CTRL_RX_EN | MAC_CTRL_RX_FLOW |
1217 	       MAC_CTRL_ADD_CRC | MAC_CTRL_PAD |
1218 	       MAC_CTRL_BC_EN | MAC_CTRL_SINGLE_PAUSE_EN |
1219 	       MAC_CTRL_HASH_ALG_CRC32;
1220 	if (hw->mac_duplex)
1221 		mac |= MAC_CTRL_DUPLX;
1222 	else
1223 		mac &= ~MAC_CTRL_DUPLX;
1224 	mac = FIELD_SETX(mac, MAC_CTRL_SPEED, hw->mac_speed);
1225 	mac = FIELD_SETX(mac, MAC_CTRL_PRMLEN, hw->preamble_len);
1226 
1227 	AT_WRITE_REG(hw, REG_TXQ_CTRL, txq);
1228 	AT_WRITE_REG(hw, REG_RXQ_CTRL, rxq);
1229 	AT_WRITE_REG(hw, REG_MAC_CTRL, mac);
1230 }
1231 
1232 /*
1233  * Reset the transmit and receive units; mask and clear all interrupts.
1234  * hw - Struct containing variables accessed by shared code
1235  * return : 0  or  idle status (if error)
1236  */
1237 static int atl1c_reset_mac(struct atl1c_hw *hw)
1238 {
1239 	struct atl1c_adapter *adapter = hw->adapter;
1240 	struct pci_dev *pdev = adapter->pdev;
1241 	u32 ctrl_data = 0;
1242 
1243 	atl1c_stop_mac(hw);
1244 	/*
1245 	 * Issue Soft Reset to the MAC.  This will reset the chip's
1246 	 * transmit, receive, DMA.  It will not effect
1247 	 * the current PCI configuration.  The global reset bit is self-
1248 	 * clearing, and should clear within a microsecond.
1249 	 */
1250 	AT_READ_REG(hw, REG_MASTER_CTRL, &ctrl_data);
1251 	ctrl_data |= MASTER_CTRL_OOB_DIS;
1252 	AT_WRITE_REG(hw, REG_MASTER_CTRL, ctrl_data | MASTER_CTRL_SOFT_RST);
1253 
1254 	AT_WRITE_FLUSH(hw);
1255 	msleep(10);
1256 	/* Wait at least 10ms for All module to be Idle */
1257 
1258 	if (atl1c_wait_until_idle(hw, IDLE_STATUS_MASK)) {
1259 		dev_err(&pdev->dev,
1260 			"MAC state machine can't be idle since"
1261 			" disabled for 10ms second\n");
1262 		return -1;
1263 	}
1264 	AT_WRITE_REG(hw, REG_MASTER_CTRL, ctrl_data);
1265 
1266 	/* driver control speed/duplex */
1267 	AT_READ_REG(hw, REG_MAC_CTRL, &ctrl_data);
1268 	AT_WRITE_REG(hw, REG_MAC_CTRL, ctrl_data | MAC_CTRL_SPEED_MODE_SW);
1269 
1270 	/* clk switch setting */
1271 	AT_READ_REG(hw, REG_SERDES, &ctrl_data);
1272 	switch (hw->nic_type) {
1273 	case athr_l2c_b:
1274 		ctrl_data &= ~(SERDES_PHY_CLK_SLOWDOWN |
1275 				SERDES_MAC_CLK_SLOWDOWN);
1276 		AT_WRITE_REG(hw, REG_SERDES, ctrl_data);
1277 		break;
1278 	case athr_l2c_b2:
1279 	case athr_l1d_2:
1280 		ctrl_data |= SERDES_PHY_CLK_SLOWDOWN | SERDES_MAC_CLK_SLOWDOWN;
1281 		AT_WRITE_REG(hw, REG_SERDES, ctrl_data);
1282 		break;
1283 	default:
1284 		break;
1285 	}
1286 
1287 	return 0;
1288 }
1289 
1290 static void atl1c_disable_l0s_l1(struct atl1c_hw *hw)
1291 {
1292 	u16 ctrl_flags = hw->ctrl_flags;
1293 
1294 	hw->ctrl_flags &= ~(ATL1C_ASPM_L0S_SUPPORT | ATL1C_ASPM_L1_SUPPORT);
1295 	atl1c_set_aspm(hw, SPEED_0);
1296 	hw->ctrl_flags = ctrl_flags;
1297 }
1298 
1299 /*
1300  * Set ASPM state.
1301  * Enable/disable L0s/L1 depend on link state.
1302  */
1303 static void atl1c_set_aspm(struct atl1c_hw *hw, u16 link_speed)
1304 {
1305 	u32 pm_ctrl_data;
1306 	u32 link_l1_timer;
1307 
1308 	AT_READ_REG(hw, REG_PM_CTRL, &pm_ctrl_data);
1309 	pm_ctrl_data &= ~(PM_CTRL_ASPM_L1_EN |
1310 			  PM_CTRL_ASPM_L0S_EN |
1311 			  PM_CTRL_MAC_ASPM_CHK);
1312 	/* L1 timer */
1313 	if (hw->nic_type == athr_l2c_b2 || hw->nic_type == athr_l1d_2) {
1314 		pm_ctrl_data &= ~PMCTRL_TXL1_AFTER_L0S;
1315 		link_l1_timer =
1316 			link_speed == SPEED_1000 || link_speed == SPEED_100 ?
1317 			L1D_PMCTRL_L1_ENTRY_TM_16US : 1;
1318 		pm_ctrl_data = FIELD_SETX(pm_ctrl_data,
1319 			L1D_PMCTRL_L1_ENTRY_TM, link_l1_timer);
1320 	} else {
1321 		link_l1_timer = hw->nic_type == athr_l2c_b ?
1322 			L2CB1_PM_CTRL_L1_ENTRY_TM : L1C_PM_CTRL_L1_ENTRY_TM;
1323 		if (link_speed != SPEED_1000 && link_speed != SPEED_100)
1324 			link_l1_timer = 1;
1325 		pm_ctrl_data = FIELD_SETX(pm_ctrl_data,
1326 			PM_CTRL_L1_ENTRY_TIMER, link_l1_timer);
1327 	}
1328 
1329 	/* L0S/L1 enable */
1330 	if ((hw->ctrl_flags & ATL1C_ASPM_L0S_SUPPORT) && link_speed != SPEED_0)
1331 		pm_ctrl_data |= PM_CTRL_ASPM_L0S_EN | PM_CTRL_MAC_ASPM_CHK;
1332 	if (hw->ctrl_flags & ATL1C_ASPM_L1_SUPPORT)
1333 		pm_ctrl_data |= PM_CTRL_ASPM_L1_EN | PM_CTRL_MAC_ASPM_CHK;
1334 
1335 	/* l2cb & l1d & l2cb2 & l1d2 */
1336 	if (hw->nic_type == athr_l2c_b || hw->nic_type == athr_l1d ||
1337 	    hw->nic_type == athr_l2c_b2 || hw->nic_type == athr_l1d_2) {
1338 		pm_ctrl_data = FIELD_SETX(pm_ctrl_data,
1339 			PM_CTRL_PM_REQ_TIMER, PM_CTRL_PM_REQ_TO_DEF);
1340 		pm_ctrl_data |= PM_CTRL_RCVR_WT_TIMER |
1341 				PM_CTRL_SERDES_PD_EX_L1 |
1342 				PM_CTRL_CLK_SWH_L1;
1343 		pm_ctrl_data &= ~(PM_CTRL_SERDES_L1_EN |
1344 				  PM_CTRL_SERDES_PLL_L1_EN |
1345 				  PM_CTRL_SERDES_BUFS_RX_L1_EN |
1346 				  PM_CTRL_SA_DLY_EN |
1347 				  PM_CTRL_HOTRST);
1348 		/* disable l0s if link down or l2cb */
1349 		if (link_speed == SPEED_0 || hw->nic_type == athr_l2c_b)
1350 			pm_ctrl_data &= ~PM_CTRL_ASPM_L0S_EN;
1351 	} else { /* l1c */
1352 		pm_ctrl_data =
1353 			FIELD_SETX(pm_ctrl_data, PM_CTRL_L1_ENTRY_TIMER, 0);
1354 		if (link_speed != SPEED_0) {
1355 			pm_ctrl_data |= PM_CTRL_SERDES_L1_EN |
1356 					PM_CTRL_SERDES_PLL_L1_EN |
1357 					PM_CTRL_SERDES_BUFS_RX_L1_EN;
1358 			pm_ctrl_data &= ~(PM_CTRL_SERDES_PD_EX_L1 |
1359 					  PM_CTRL_CLK_SWH_L1 |
1360 					  PM_CTRL_ASPM_L0S_EN |
1361 					  PM_CTRL_ASPM_L1_EN);
1362 		} else { /* link down */
1363 			pm_ctrl_data |= PM_CTRL_CLK_SWH_L1;
1364 			pm_ctrl_data &= ~(PM_CTRL_SERDES_L1_EN |
1365 					  PM_CTRL_SERDES_PLL_L1_EN |
1366 					  PM_CTRL_SERDES_BUFS_RX_L1_EN |
1367 					  PM_CTRL_ASPM_L0S_EN);
1368 		}
1369 	}
1370 	AT_WRITE_REG(hw, REG_PM_CTRL, pm_ctrl_data);
1371 
1372 	return;
1373 }
1374 
1375 /**
1376  * atl1c_configure - Configure Transmit&Receive Unit after Reset
1377  * @adapter: board private structure
1378  *
1379  * Configure the Tx /Rx unit of the MAC after a reset.
1380  */
1381 static int atl1c_configure_mac(struct atl1c_adapter *adapter)
1382 {
1383 	struct atl1c_hw *hw = &adapter->hw;
1384 	u32 master_ctrl_data = 0;
1385 	u32 intr_modrt_data;
1386 	u32 data;
1387 
1388 	AT_READ_REG(hw, REG_MASTER_CTRL, &master_ctrl_data);
1389 	master_ctrl_data &= ~(MASTER_CTRL_TX_ITIMER_EN |
1390 			      MASTER_CTRL_RX_ITIMER_EN |
1391 			      MASTER_CTRL_INT_RDCLR);
1392 	/* clear interrupt status */
1393 	AT_WRITE_REG(hw, REG_ISR, 0xFFFFFFFF);
1394 	/*  Clear any WOL status */
1395 	AT_WRITE_REG(hw, REG_WOL_CTRL, 0);
1396 	/* set Interrupt Clear Timer
1397 	 * HW will enable self to assert interrupt event to system after
1398 	 * waiting x-time for software to notify it accept interrupt.
1399 	 */
1400 
1401 	data = CLK_GATING_EN_ALL;
1402 	if (hw->ctrl_flags & ATL1C_CLK_GATING_EN) {
1403 		if (hw->nic_type == athr_l2c_b)
1404 			data &= ~CLK_GATING_RXMAC_EN;
1405 	} else
1406 		data = 0;
1407 	AT_WRITE_REG(hw, REG_CLK_GATING_CTRL, data);
1408 
1409 	AT_WRITE_REG(hw, REG_INT_RETRIG_TIMER,
1410 		hw->ict & INT_RETRIG_TIMER_MASK);
1411 
1412 	atl1c_configure_des_ring(adapter);
1413 
1414 	if (hw->ctrl_flags & ATL1C_INTR_MODRT_ENABLE) {
1415 		intr_modrt_data = (hw->tx_imt & IRQ_MODRT_TIMER_MASK) <<
1416 					IRQ_MODRT_TX_TIMER_SHIFT;
1417 		intr_modrt_data |= (hw->rx_imt & IRQ_MODRT_TIMER_MASK) <<
1418 					IRQ_MODRT_RX_TIMER_SHIFT;
1419 		AT_WRITE_REG(hw, REG_IRQ_MODRT_TIMER_INIT, intr_modrt_data);
1420 		master_ctrl_data |=
1421 			MASTER_CTRL_TX_ITIMER_EN | MASTER_CTRL_RX_ITIMER_EN;
1422 	}
1423 
1424 	if (hw->ctrl_flags & ATL1C_INTR_CLEAR_ON_READ)
1425 		master_ctrl_data |= MASTER_CTRL_INT_RDCLR;
1426 
1427 	master_ctrl_data |= MASTER_CTRL_SA_TIMER_EN;
1428 	AT_WRITE_REG(hw, REG_MASTER_CTRL, master_ctrl_data);
1429 
1430 	AT_WRITE_REG(hw, REG_SMB_STAT_TIMER,
1431 		hw->smb_timer & SMB_STAT_TIMER_MASK);
1432 
1433 	/* set MTU */
1434 	AT_WRITE_REG(hw, REG_MTU, hw->max_frame_size + ETH_HLEN +
1435 			VLAN_HLEN + ETH_FCS_LEN);
1436 
1437 	atl1c_configure_tx(adapter);
1438 	atl1c_configure_rx(adapter);
1439 	atl1c_configure_dma(adapter);
1440 
1441 	return 0;
1442 }
1443 
1444 static int atl1c_configure(struct atl1c_adapter *adapter)
1445 {
1446 	struct net_device *netdev = adapter->netdev;
1447 	int num;
1448 
1449 	atl1c_init_ring_ptrs(adapter);
1450 	atl1c_set_multi(netdev);
1451 	atl1c_restore_vlan(adapter);
1452 
1453 	num = atl1c_alloc_rx_buffer(adapter);
1454 	if (unlikely(num == 0))
1455 		return -ENOMEM;
1456 
1457 	if (atl1c_configure_mac(adapter))
1458 		return -EIO;
1459 
1460 	return 0;
1461 }
1462 
1463 static void atl1c_update_hw_stats(struct atl1c_adapter *adapter)
1464 {
1465 	u16 hw_reg_addr = 0;
1466 	unsigned long *stats_item = NULL;
1467 	u32 data;
1468 
1469 	/* update rx status */
1470 	hw_reg_addr = REG_MAC_RX_STATUS_BIN;
1471 	stats_item  = &adapter->hw_stats.rx_ok;
1472 	while (hw_reg_addr <= REG_MAC_RX_STATUS_END) {
1473 		AT_READ_REG(&adapter->hw, hw_reg_addr, &data);
1474 		*stats_item += data;
1475 		stats_item++;
1476 		hw_reg_addr += 4;
1477 	}
1478 /* update tx status */
1479 	hw_reg_addr = REG_MAC_TX_STATUS_BIN;
1480 	stats_item  = &adapter->hw_stats.tx_ok;
1481 	while (hw_reg_addr <= REG_MAC_TX_STATUS_END) {
1482 		AT_READ_REG(&adapter->hw, hw_reg_addr, &data);
1483 		*stats_item += data;
1484 		stats_item++;
1485 		hw_reg_addr += 4;
1486 	}
1487 }
1488 
1489 /**
1490  * atl1c_get_stats - Get System Network Statistics
1491  * @netdev: network interface device structure
1492  *
1493  * Returns the address of the device statistics structure.
1494  * The statistics are actually updated from the timer callback.
1495  */
1496 static struct net_device_stats *atl1c_get_stats(struct net_device *netdev)
1497 {
1498 	struct atl1c_adapter *adapter = netdev_priv(netdev);
1499 	struct atl1c_hw_stats  *hw_stats = &adapter->hw_stats;
1500 	struct net_device_stats *net_stats = &netdev->stats;
1501 
1502 	atl1c_update_hw_stats(adapter);
1503 	net_stats->rx_bytes   = hw_stats->rx_byte_cnt;
1504 	net_stats->tx_bytes   = hw_stats->tx_byte_cnt;
1505 	net_stats->multicast  = hw_stats->rx_mcast;
1506 	net_stats->collisions = hw_stats->tx_1_col +
1507 				hw_stats->tx_2_col +
1508 				hw_stats->tx_late_col +
1509 				hw_stats->tx_abort_col;
1510 
1511 	net_stats->rx_errors  = hw_stats->rx_frag +
1512 				hw_stats->rx_fcs_err +
1513 				hw_stats->rx_len_err +
1514 				hw_stats->rx_sz_ov +
1515 				hw_stats->rx_rrd_ov +
1516 				hw_stats->rx_align_err +
1517 				hw_stats->rx_rxf_ov;
1518 
1519 	net_stats->rx_fifo_errors   = hw_stats->rx_rxf_ov;
1520 	net_stats->rx_length_errors = hw_stats->rx_len_err;
1521 	net_stats->rx_crc_errors    = hw_stats->rx_fcs_err;
1522 	net_stats->rx_frame_errors  = hw_stats->rx_align_err;
1523 	net_stats->rx_dropped       = hw_stats->rx_rrd_ov;
1524 
1525 	net_stats->tx_errors = hw_stats->tx_late_col +
1526 			       hw_stats->tx_abort_col +
1527 			       hw_stats->tx_underrun +
1528 			       hw_stats->tx_trunc;
1529 
1530 	net_stats->tx_fifo_errors    = hw_stats->tx_underrun;
1531 	net_stats->tx_aborted_errors = hw_stats->tx_abort_col;
1532 	net_stats->tx_window_errors  = hw_stats->tx_late_col;
1533 
1534 	net_stats->rx_packets = hw_stats->rx_ok + net_stats->rx_errors;
1535 	net_stats->tx_packets = hw_stats->tx_ok + net_stats->tx_errors;
1536 
1537 	return net_stats;
1538 }
1539 
1540 static inline void atl1c_clear_phy_int(struct atl1c_adapter *adapter)
1541 {
1542 	u16 phy_data;
1543 
1544 	spin_lock(&adapter->mdio_lock);
1545 	atl1c_read_phy_reg(&adapter->hw, MII_ISR, &phy_data);
1546 	spin_unlock(&adapter->mdio_lock);
1547 }
1548 
1549 static bool atl1c_clean_tx_irq(struct atl1c_adapter *adapter,
1550 				enum atl1c_trans_queue type)
1551 {
1552 	struct atl1c_tpd_ring *tpd_ring = &adapter->tpd_ring[type];
1553 	struct atl1c_buffer *buffer_info;
1554 	struct pci_dev *pdev = adapter->pdev;
1555 	u16 next_to_clean = atomic_read(&tpd_ring->next_to_clean);
1556 	u16 hw_next_to_clean;
1557 	u16 reg;
1558 	unsigned int total_bytes = 0, total_packets = 0;
1559 
1560 	reg = type == atl1c_trans_high ? REG_TPD_PRI1_CIDX : REG_TPD_PRI0_CIDX;
1561 
1562 	AT_READ_REGW(&adapter->hw, reg, &hw_next_to_clean);
1563 
1564 	while (next_to_clean != hw_next_to_clean) {
1565 		buffer_info = &tpd_ring->buffer_info[next_to_clean];
1566 		if (buffer_info->skb) {
1567 			total_bytes += buffer_info->skb->len;
1568 			total_packets++;
1569 		}
1570 		atl1c_clean_buffer(pdev, buffer_info);
1571 		if (++next_to_clean == tpd_ring->count)
1572 			next_to_clean = 0;
1573 		atomic_set(&tpd_ring->next_to_clean, next_to_clean);
1574 	}
1575 
1576 	netdev_completed_queue(adapter->netdev, total_packets, total_bytes);
1577 
1578 	if (netif_queue_stopped(adapter->netdev) &&
1579 			netif_carrier_ok(adapter->netdev)) {
1580 		netif_wake_queue(adapter->netdev);
1581 	}
1582 
1583 	return true;
1584 }
1585 
1586 /**
1587  * atl1c_intr - Interrupt Handler
1588  * @irq: interrupt number
1589  * @data: pointer to a network interface device structure
1590  */
1591 static irqreturn_t atl1c_intr(int irq, void *data)
1592 {
1593 	struct net_device *netdev  = data;
1594 	struct atl1c_adapter *adapter = netdev_priv(netdev);
1595 	struct pci_dev *pdev = adapter->pdev;
1596 	struct atl1c_hw *hw = &adapter->hw;
1597 	int max_ints = AT_MAX_INT_WORK;
1598 	int handled = IRQ_NONE;
1599 	u32 status;
1600 	u32 reg_data;
1601 
1602 	do {
1603 		AT_READ_REG(hw, REG_ISR, &reg_data);
1604 		status = reg_data & hw->intr_mask;
1605 
1606 		if (status == 0 || (status & ISR_DIS_INT) != 0) {
1607 			if (max_ints != AT_MAX_INT_WORK)
1608 				handled = IRQ_HANDLED;
1609 			break;
1610 		}
1611 		/* link event */
1612 		if (status & ISR_GPHY)
1613 			atl1c_clear_phy_int(adapter);
1614 		/* Ack ISR */
1615 		AT_WRITE_REG(hw, REG_ISR, status | ISR_DIS_INT);
1616 		if (status & ISR_RX_PKT) {
1617 			if (likely(napi_schedule_prep(&adapter->napi))) {
1618 				hw->intr_mask &= ~ISR_RX_PKT;
1619 				AT_WRITE_REG(hw, REG_IMR, hw->intr_mask);
1620 				__napi_schedule(&adapter->napi);
1621 			}
1622 		}
1623 		if (status & ISR_TX_PKT)
1624 			atl1c_clean_tx_irq(adapter, atl1c_trans_normal);
1625 
1626 		handled = IRQ_HANDLED;
1627 		/* check if PCIE PHY Link down */
1628 		if (status & ISR_ERROR) {
1629 			if (netif_msg_hw(adapter))
1630 				dev_err(&pdev->dev,
1631 					"atl1c hardware error (status = 0x%x)\n",
1632 					status & ISR_ERROR);
1633 			/* reset MAC */
1634 			set_bit(ATL1C_WORK_EVENT_RESET, &adapter->work_event);
1635 			schedule_work(&adapter->common_task);
1636 			return IRQ_HANDLED;
1637 		}
1638 
1639 		if (status & ISR_OVER)
1640 			if (netif_msg_intr(adapter))
1641 				dev_warn(&pdev->dev,
1642 					"TX/RX overflow (status = 0x%x)\n",
1643 					status & ISR_OVER);
1644 
1645 		/* link event */
1646 		if (status & (ISR_GPHY | ISR_MANUAL)) {
1647 			netdev->stats.tx_carrier_errors++;
1648 			atl1c_link_chg_event(adapter);
1649 			break;
1650 		}
1651 
1652 	} while (--max_ints > 0);
1653 	/* re-enable Interrupt*/
1654 	AT_WRITE_REG(&adapter->hw, REG_ISR, 0);
1655 	return handled;
1656 }
1657 
1658 static inline void atl1c_rx_checksum(struct atl1c_adapter *adapter,
1659 		  struct sk_buff *skb, struct atl1c_recv_ret_status *prrs)
1660 {
1661 	/*
1662 	 * The pid field in RRS in not correct sometimes, so we
1663 	 * cannot figure out if the packet is fragmented or not,
1664 	 * so we tell the KERNEL CHECKSUM_NONE
1665 	 */
1666 	skb_checksum_none_assert(skb);
1667 }
1668 
1669 static struct sk_buff *atl1c_alloc_skb(struct atl1c_adapter *adapter)
1670 {
1671 	struct sk_buff *skb;
1672 	struct page *page;
1673 
1674 	if (adapter->rx_frag_size > PAGE_SIZE)
1675 		return netdev_alloc_skb(adapter->netdev,
1676 					adapter->rx_buffer_len);
1677 
1678 	page = adapter->rx_page;
1679 	if (!page) {
1680 		adapter->rx_page = page = alloc_page(GFP_ATOMIC);
1681 		if (unlikely(!page))
1682 			return NULL;
1683 		adapter->rx_page_offset = 0;
1684 	}
1685 
1686 	skb = build_skb(page_address(page) + adapter->rx_page_offset,
1687 			adapter->rx_frag_size);
1688 	if (likely(skb)) {
1689 		adapter->rx_page_offset += adapter->rx_frag_size;
1690 		if (adapter->rx_page_offset >= PAGE_SIZE)
1691 			adapter->rx_page = NULL;
1692 		else
1693 			get_page(page);
1694 	}
1695 	return skb;
1696 }
1697 
1698 static int atl1c_alloc_rx_buffer(struct atl1c_adapter *adapter)
1699 {
1700 	struct atl1c_rfd_ring *rfd_ring = &adapter->rfd_ring;
1701 	struct pci_dev *pdev = adapter->pdev;
1702 	struct atl1c_buffer *buffer_info, *next_info;
1703 	struct sk_buff *skb;
1704 	void *vir_addr = NULL;
1705 	u16 num_alloc = 0;
1706 	u16 rfd_next_to_use, next_next;
1707 	struct atl1c_rx_free_desc *rfd_desc;
1708 	dma_addr_t mapping;
1709 
1710 	next_next = rfd_next_to_use = rfd_ring->next_to_use;
1711 	if (++next_next == rfd_ring->count)
1712 		next_next = 0;
1713 	buffer_info = &rfd_ring->buffer_info[rfd_next_to_use];
1714 	next_info = &rfd_ring->buffer_info[next_next];
1715 
1716 	while (next_info->flags & ATL1C_BUFFER_FREE) {
1717 		rfd_desc = ATL1C_RFD_DESC(rfd_ring, rfd_next_to_use);
1718 
1719 		skb = atl1c_alloc_skb(adapter);
1720 		if (unlikely(!skb)) {
1721 			if (netif_msg_rx_err(adapter))
1722 				dev_warn(&pdev->dev, "alloc rx buffer failed\n");
1723 			break;
1724 		}
1725 
1726 		/*
1727 		 * Make buffer alignment 2 beyond a 16 byte boundary
1728 		 * this will result in a 16 byte aligned IP header after
1729 		 * the 14 byte MAC header is removed
1730 		 */
1731 		vir_addr = skb->data;
1732 		ATL1C_SET_BUFFER_STATE(buffer_info, ATL1C_BUFFER_BUSY);
1733 		buffer_info->skb = skb;
1734 		buffer_info->length = adapter->rx_buffer_len;
1735 		mapping = pci_map_single(pdev, vir_addr,
1736 						buffer_info->length,
1737 						PCI_DMA_FROMDEVICE);
1738 		if (unlikely(pci_dma_mapping_error(pdev, mapping))) {
1739 			dev_kfree_skb(skb);
1740 			buffer_info->skb = NULL;
1741 			buffer_info->length = 0;
1742 			ATL1C_SET_BUFFER_STATE(buffer_info, ATL1C_BUFFER_FREE);
1743 			netif_warn(adapter, rx_err, adapter->netdev, "RX pci_map_single failed");
1744 			break;
1745 		}
1746 		buffer_info->dma = mapping;
1747 		ATL1C_SET_PCIMAP_TYPE(buffer_info, ATL1C_PCIMAP_SINGLE,
1748 			ATL1C_PCIMAP_FROMDEVICE);
1749 		rfd_desc->buffer_addr = cpu_to_le64(buffer_info->dma);
1750 		rfd_next_to_use = next_next;
1751 		if (++next_next == rfd_ring->count)
1752 			next_next = 0;
1753 		buffer_info = &rfd_ring->buffer_info[rfd_next_to_use];
1754 		next_info = &rfd_ring->buffer_info[next_next];
1755 		num_alloc++;
1756 	}
1757 
1758 	if (num_alloc) {
1759 		/* TODO: update mailbox here */
1760 		wmb();
1761 		rfd_ring->next_to_use = rfd_next_to_use;
1762 		AT_WRITE_REG(&adapter->hw, REG_MB_RFD0_PROD_IDX,
1763 			rfd_ring->next_to_use & MB_RFDX_PROD_IDX_MASK);
1764 	}
1765 
1766 	return num_alloc;
1767 }
1768 
1769 static void atl1c_clean_rrd(struct atl1c_rrd_ring *rrd_ring,
1770 			struct	atl1c_recv_ret_status *rrs, u16 num)
1771 {
1772 	u16 i;
1773 	/* the relationship between rrd and rfd is one map one */
1774 	for (i = 0; i < num; i++, rrs = ATL1C_RRD_DESC(rrd_ring,
1775 					rrd_ring->next_to_clean)) {
1776 		rrs->word3 &= ~RRS_RXD_UPDATED;
1777 		if (++rrd_ring->next_to_clean == rrd_ring->count)
1778 			rrd_ring->next_to_clean = 0;
1779 	}
1780 }
1781 
1782 static void atl1c_clean_rfd(struct atl1c_rfd_ring *rfd_ring,
1783 	struct atl1c_recv_ret_status *rrs, u16 num)
1784 {
1785 	u16 i;
1786 	u16 rfd_index;
1787 	struct atl1c_buffer *buffer_info = rfd_ring->buffer_info;
1788 
1789 	rfd_index = (rrs->word0 >> RRS_RX_RFD_INDEX_SHIFT) &
1790 			RRS_RX_RFD_INDEX_MASK;
1791 	for (i = 0; i < num; i++) {
1792 		buffer_info[rfd_index].skb = NULL;
1793 		ATL1C_SET_BUFFER_STATE(&buffer_info[rfd_index],
1794 					ATL1C_BUFFER_FREE);
1795 		if (++rfd_index == rfd_ring->count)
1796 			rfd_index = 0;
1797 	}
1798 	rfd_ring->next_to_clean = rfd_index;
1799 }
1800 
1801 static void atl1c_clean_rx_irq(struct atl1c_adapter *adapter,
1802 		   int *work_done, int work_to_do)
1803 {
1804 	u16 rfd_num, rfd_index;
1805 	u16 count = 0;
1806 	u16 length;
1807 	struct pci_dev *pdev = adapter->pdev;
1808 	struct net_device *netdev  = adapter->netdev;
1809 	struct atl1c_rfd_ring *rfd_ring = &adapter->rfd_ring;
1810 	struct atl1c_rrd_ring *rrd_ring = &adapter->rrd_ring;
1811 	struct sk_buff *skb;
1812 	struct atl1c_recv_ret_status *rrs;
1813 	struct atl1c_buffer *buffer_info;
1814 
1815 	while (1) {
1816 		if (*work_done >= work_to_do)
1817 			break;
1818 		rrs = ATL1C_RRD_DESC(rrd_ring, rrd_ring->next_to_clean);
1819 		if (likely(RRS_RXD_IS_VALID(rrs->word3))) {
1820 			rfd_num = (rrs->word0 >> RRS_RX_RFD_CNT_SHIFT) &
1821 				RRS_RX_RFD_CNT_MASK;
1822 			if (unlikely(rfd_num != 1))
1823 				/* TODO support mul rfd*/
1824 				if (netif_msg_rx_err(adapter))
1825 					dev_warn(&pdev->dev,
1826 						"Multi rfd not support yet!\n");
1827 			goto rrs_checked;
1828 		} else {
1829 			break;
1830 		}
1831 rrs_checked:
1832 		atl1c_clean_rrd(rrd_ring, rrs, rfd_num);
1833 		if (rrs->word3 & (RRS_RX_ERR_SUM | RRS_802_3_LEN_ERR)) {
1834 			atl1c_clean_rfd(rfd_ring, rrs, rfd_num);
1835 				if (netif_msg_rx_err(adapter))
1836 					dev_warn(&pdev->dev,
1837 						"wrong packet! rrs word3 is %x\n",
1838 						rrs->word3);
1839 			continue;
1840 		}
1841 
1842 		length = le16_to_cpu((rrs->word3 >> RRS_PKT_SIZE_SHIFT) &
1843 				RRS_PKT_SIZE_MASK);
1844 		/* Good Receive */
1845 		if (likely(rfd_num == 1)) {
1846 			rfd_index = (rrs->word0 >> RRS_RX_RFD_INDEX_SHIFT) &
1847 					RRS_RX_RFD_INDEX_MASK;
1848 			buffer_info = &rfd_ring->buffer_info[rfd_index];
1849 			pci_unmap_single(pdev, buffer_info->dma,
1850 				buffer_info->length, PCI_DMA_FROMDEVICE);
1851 			skb = buffer_info->skb;
1852 		} else {
1853 			/* TODO */
1854 			if (netif_msg_rx_err(adapter))
1855 				dev_warn(&pdev->dev,
1856 					"Multi rfd not support yet!\n");
1857 			break;
1858 		}
1859 		atl1c_clean_rfd(rfd_ring, rrs, rfd_num);
1860 		skb_put(skb, length - ETH_FCS_LEN);
1861 		skb->protocol = eth_type_trans(skb, netdev);
1862 		atl1c_rx_checksum(adapter, skb, rrs);
1863 		if (rrs->word3 & RRS_VLAN_INS) {
1864 			u16 vlan;
1865 
1866 			AT_TAG_TO_VLAN(rrs->vlan_tag, vlan);
1867 			vlan = le16_to_cpu(vlan);
1868 			__vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), vlan);
1869 		}
1870 		netif_receive_skb(skb);
1871 
1872 		(*work_done)++;
1873 		count++;
1874 	}
1875 	if (count)
1876 		atl1c_alloc_rx_buffer(adapter);
1877 }
1878 
1879 /**
1880  * atl1c_clean - NAPI Rx polling callback
1881  */
1882 static int atl1c_clean(struct napi_struct *napi, int budget)
1883 {
1884 	struct atl1c_adapter *adapter =
1885 			container_of(napi, struct atl1c_adapter, napi);
1886 	int work_done = 0;
1887 
1888 	/* Keep link state information with original netdev */
1889 	if (!netif_carrier_ok(adapter->netdev))
1890 		goto quit_polling;
1891 	/* just enable one RXQ */
1892 	atl1c_clean_rx_irq(adapter, &work_done, budget);
1893 
1894 	if (work_done < budget) {
1895 quit_polling:
1896 		napi_complete_done(napi, work_done);
1897 		adapter->hw.intr_mask |= ISR_RX_PKT;
1898 		AT_WRITE_REG(&adapter->hw, REG_IMR, adapter->hw.intr_mask);
1899 	}
1900 	return work_done;
1901 }
1902 
1903 #ifdef CONFIG_NET_POLL_CONTROLLER
1904 
1905 /*
1906  * Polling 'interrupt' - used by things like netconsole to send skbs
1907  * without having to re-enable interrupts. It's not called while
1908  * the interrupt routine is executing.
1909  */
1910 static void atl1c_netpoll(struct net_device *netdev)
1911 {
1912 	struct atl1c_adapter *adapter = netdev_priv(netdev);
1913 
1914 	disable_irq(adapter->pdev->irq);
1915 	atl1c_intr(adapter->pdev->irq, netdev);
1916 	enable_irq(adapter->pdev->irq);
1917 }
1918 #endif
1919 
1920 static inline u16 atl1c_tpd_avail(struct atl1c_adapter *adapter, enum atl1c_trans_queue type)
1921 {
1922 	struct atl1c_tpd_ring *tpd_ring = &adapter->tpd_ring[type];
1923 	u16 next_to_use = 0;
1924 	u16 next_to_clean = 0;
1925 
1926 	next_to_clean = atomic_read(&tpd_ring->next_to_clean);
1927 	next_to_use   = tpd_ring->next_to_use;
1928 
1929 	return (u16)(next_to_clean > next_to_use) ?
1930 		(next_to_clean - next_to_use - 1) :
1931 		(tpd_ring->count + next_to_clean - next_to_use - 1);
1932 }
1933 
1934 /*
1935  * get next usable tpd
1936  * Note: should call atl1c_tdp_avail to make sure
1937  * there is enough tpd to use
1938  */
1939 static struct atl1c_tpd_desc *atl1c_get_tpd(struct atl1c_adapter *adapter,
1940 	enum atl1c_trans_queue type)
1941 {
1942 	struct atl1c_tpd_ring *tpd_ring = &adapter->tpd_ring[type];
1943 	struct atl1c_tpd_desc *tpd_desc;
1944 	u16 next_to_use = 0;
1945 
1946 	next_to_use = tpd_ring->next_to_use;
1947 	if (++tpd_ring->next_to_use == tpd_ring->count)
1948 		tpd_ring->next_to_use = 0;
1949 	tpd_desc = ATL1C_TPD_DESC(tpd_ring, next_to_use);
1950 	memset(tpd_desc, 0, sizeof(struct atl1c_tpd_desc));
1951 	return	tpd_desc;
1952 }
1953 
1954 static struct atl1c_buffer *
1955 atl1c_get_tx_buffer(struct atl1c_adapter *adapter, struct atl1c_tpd_desc *tpd)
1956 {
1957 	struct atl1c_tpd_ring *tpd_ring = adapter->tpd_ring;
1958 
1959 	return &tpd_ring->buffer_info[tpd -
1960 			(struct atl1c_tpd_desc *)tpd_ring->desc];
1961 }
1962 
1963 /* Calculate the transmit packet descript needed*/
1964 static u16 atl1c_cal_tpd_req(const struct sk_buff *skb)
1965 {
1966 	u16 tpd_req;
1967 	u16 proto_hdr_len = 0;
1968 
1969 	tpd_req = skb_shinfo(skb)->nr_frags + 1;
1970 
1971 	if (skb_is_gso(skb)) {
1972 		proto_hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
1973 		if (proto_hdr_len < skb_headlen(skb))
1974 			tpd_req++;
1975 		if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6)
1976 			tpd_req++;
1977 	}
1978 	return tpd_req;
1979 }
1980 
1981 static int atl1c_tso_csum(struct atl1c_adapter *adapter,
1982 			  struct sk_buff *skb,
1983 			  struct atl1c_tpd_desc **tpd,
1984 			  enum atl1c_trans_queue type)
1985 {
1986 	struct pci_dev *pdev = adapter->pdev;
1987 	unsigned short offload_type;
1988 	u8 hdr_len;
1989 	u32 real_len;
1990 
1991 	if (skb_is_gso(skb)) {
1992 		int err;
1993 
1994 		err = skb_cow_head(skb, 0);
1995 		if (err < 0)
1996 			return err;
1997 
1998 		offload_type = skb_shinfo(skb)->gso_type;
1999 
2000 		if (offload_type & SKB_GSO_TCPV4) {
2001 			real_len = (((unsigned char *)ip_hdr(skb) - skb->data)
2002 					+ ntohs(ip_hdr(skb)->tot_len));
2003 
2004 			if (real_len < skb->len)
2005 				pskb_trim(skb, real_len);
2006 
2007 			hdr_len = (skb_transport_offset(skb) + tcp_hdrlen(skb));
2008 			if (unlikely(skb->len == hdr_len)) {
2009 				/* only xsum need */
2010 				if (netif_msg_tx_queued(adapter))
2011 					dev_warn(&pdev->dev,
2012 						"IPV4 tso with zero data??\n");
2013 				goto check_sum;
2014 			} else {
2015 				ip_hdr(skb)->check = 0;
2016 				tcp_hdr(skb)->check = ~csum_tcpudp_magic(
2017 							ip_hdr(skb)->saddr,
2018 							ip_hdr(skb)->daddr,
2019 							0, IPPROTO_TCP, 0);
2020 				(*tpd)->word1 |= 1 << TPD_IPV4_PACKET_SHIFT;
2021 			}
2022 		}
2023 
2024 		if (offload_type & SKB_GSO_TCPV6) {
2025 			struct atl1c_tpd_ext_desc *etpd =
2026 				*(struct atl1c_tpd_ext_desc **)(tpd);
2027 
2028 			memset(etpd, 0, sizeof(struct atl1c_tpd_ext_desc));
2029 			*tpd = atl1c_get_tpd(adapter, type);
2030 			ipv6_hdr(skb)->payload_len = 0;
2031 			/* check payload == 0 byte ? */
2032 			hdr_len = (skb_transport_offset(skb) + tcp_hdrlen(skb));
2033 			if (unlikely(skb->len == hdr_len)) {
2034 				/* only xsum need */
2035 				if (netif_msg_tx_queued(adapter))
2036 					dev_warn(&pdev->dev,
2037 						"IPV6 tso with zero data??\n");
2038 				goto check_sum;
2039 			} else
2040 				tcp_hdr(skb)->check = ~csum_ipv6_magic(
2041 						&ipv6_hdr(skb)->saddr,
2042 						&ipv6_hdr(skb)->daddr,
2043 						0, IPPROTO_TCP, 0);
2044 			etpd->word1 |= 1 << TPD_LSO_EN_SHIFT;
2045 			etpd->word1 |= 1 << TPD_LSO_VER_SHIFT;
2046 			etpd->pkt_len = cpu_to_le32(skb->len);
2047 			(*tpd)->word1 |= 1 << TPD_LSO_VER_SHIFT;
2048 		}
2049 
2050 		(*tpd)->word1 |= 1 << TPD_LSO_EN_SHIFT;
2051 		(*tpd)->word1 |= (skb_transport_offset(skb) & TPD_TCPHDR_OFFSET_MASK) <<
2052 				TPD_TCPHDR_OFFSET_SHIFT;
2053 		(*tpd)->word1 |= (skb_shinfo(skb)->gso_size & TPD_MSS_MASK) <<
2054 				TPD_MSS_SHIFT;
2055 		return 0;
2056 	}
2057 
2058 check_sum:
2059 	if (likely(skb->ip_summed == CHECKSUM_PARTIAL)) {
2060 		u8 css, cso;
2061 		cso = skb_checksum_start_offset(skb);
2062 
2063 		if (unlikely(cso & 0x1)) {
2064 			if (netif_msg_tx_err(adapter))
2065 				dev_err(&adapter->pdev->dev,
2066 					"payload offset should not an event number\n");
2067 			return -1;
2068 		} else {
2069 			css = cso + skb->csum_offset;
2070 
2071 			(*tpd)->word1 |= ((cso >> 1) & TPD_PLOADOFFSET_MASK) <<
2072 					TPD_PLOADOFFSET_SHIFT;
2073 			(*tpd)->word1 |= ((css >> 1) & TPD_CCSUM_OFFSET_MASK) <<
2074 					TPD_CCSUM_OFFSET_SHIFT;
2075 			(*tpd)->word1 |= 1 << TPD_CCSUM_EN_SHIFT;
2076 		}
2077 	}
2078 	return 0;
2079 }
2080 
2081 static void atl1c_tx_rollback(struct atl1c_adapter *adpt,
2082 			      struct atl1c_tpd_desc *first_tpd,
2083 			      enum atl1c_trans_queue type)
2084 {
2085 	struct atl1c_tpd_ring *tpd_ring = &adpt->tpd_ring[type];
2086 	struct atl1c_buffer *buffer_info;
2087 	struct atl1c_tpd_desc *tpd;
2088 	u16 first_index, index;
2089 
2090 	first_index = first_tpd - (struct atl1c_tpd_desc *)tpd_ring->desc;
2091 	index = first_index;
2092 	while (index != tpd_ring->next_to_use) {
2093 		tpd = ATL1C_TPD_DESC(tpd_ring, index);
2094 		buffer_info = &tpd_ring->buffer_info[index];
2095 		atl1c_clean_buffer(adpt->pdev, buffer_info);
2096 		memset(tpd, 0, sizeof(struct atl1c_tpd_desc));
2097 		if (++index == tpd_ring->count)
2098 			index = 0;
2099 	}
2100 	tpd_ring->next_to_use = first_index;
2101 }
2102 
2103 static int atl1c_tx_map(struct atl1c_adapter *adapter,
2104 		      struct sk_buff *skb, struct atl1c_tpd_desc *tpd,
2105 			enum atl1c_trans_queue type)
2106 {
2107 	struct atl1c_tpd_desc *use_tpd = NULL;
2108 	struct atl1c_buffer *buffer_info = NULL;
2109 	u16 buf_len = skb_headlen(skb);
2110 	u16 map_len = 0;
2111 	u16 mapped_len = 0;
2112 	u16 hdr_len = 0;
2113 	u16 nr_frags;
2114 	u16 f;
2115 	int tso;
2116 
2117 	nr_frags = skb_shinfo(skb)->nr_frags;
2118 	tso = (tpd->word1 >> TPD_LSO_EN_SHIFT) & TPD_LSO_EN_MASK;
2119 	if (tso) {
2120 		/* TSO */
2121 		map_len = hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
2122 		use_tpd = tpd;
2123 
2124 		buffer_info = atl1c_get_tx_buffer(adapter, use_tpd);
2125 		buffer_info->length = map_len;
2126 		buffer_info->dma = pci_map_single(adapter->pdev,
2127 					skb->data, hdr_len, PCI_DMA_TODEVICE);
2128 		if (unlikely(pci_dma_mapping_error(adapter->pdev,
2129 						   buffer_info->dma)))
2130 			goto err_dma;
2131 		ATL1C_SET_BUFFER_STATE(buffer_info, ATL1C_BUFFER_BUSY);
2132 		ATL1C_SET_PCIMAP_TYPE(buffer_info, ATL1C_PCIMAP_SINGLE,
2133 			ATL1C_PCIMAP_TODEVICE);
2134 		mapped_len += map_len;
2135 		use_tpd->buffer_addr = cpu_to_le64(buffer_info->dma);
2136 		use_tpd->buffer_len = cpu_to_le16(buffer_info->length);
2137 	}
2138 
2139 	if (mapped_len < buf_len) {
2140 		/* mapped_len == 0, means we should use the first tpd,
2141 		   which is given by caller  */
2142 		if (mapped_len == 0)
2143 			use_tpd = tpd;
2144 		else {
2145 			use_tpd = atl1c_get_tpd(adapter, type);
2146 			memcpy(use_tpd, tpd, sizeof(struct atl1c_tpd_desc));
2147 		}
2148 		buffer_info = atl1c_get_tx_buffer(adapter, use_tpd);
2149 		buffer_info->length = buf_len - mapped_len;
2150 		buffer_info->dma =
2151 			pci_map_single(adapter->pdev, skb->data + mapped_len,
2152 					buffer_info->length, PCI_DMA_TODEVICE);
2153 		if (unlikely(pci_dma_mapping_error(adapter->pdev,
2154 						   buffer_info->dma)))
2155 			goto err_dma;
2156 
2157 		ATL1C_SET_BUFFER_STATE(buffer_info, ATL1C_BUFFER_BUSY);
2158 		ATL1C_SET_PCIMAP_TYPE(buffer_info, ATL1C_PCIMAP_SINGLE,
2159 			ATL1C_PCIMAP_TODEVICE);
2160 		use_tpd->buffer_addr = cpu_to_le64(buffer_info->dma);
2161 		use_tpd->buffer_len  = cpu_to_le16(buffer_info->length);
2162 	}
2163 
2164 	for (f = 0; f < nr_frags; f++) {
2165 		struct skb_frag_struct *frag;
2166 
2167 		frag = &skb_shinfo(skb)->frags[f];
2168 
2169 		use_tpd = atl1c_get_tpd(adapter, type);
2170 		memcpy(use_tpd, tpd, sizeof(struct atl1c_tpd_desc));
2171 
2172 		buffer_info = atl1c_get_tx_buffer(adapter, use_tpd);
2173 		buffer_info->length = skb_frag_size(frag);
2174 		buffer_info->dma = skb_frag_dma_map(&adapter->pdev->dev,
2175 						    frag, 0,
2176 						    buffer_info->length,
2177 						    DMA_TO_DEVICE);
2178 		if (dma_mapping_error(&adapter->pdev->dev, buffer_info->dma))
2179 			goto err_dma;
2180 
2181 		ATL1C_SET_BUFFER_STATE(buffer_info, ATL1C_BUFFER_BUSY);
2182 		ATL1C_SET_PCIMAP_TYPE(buffer_info, ATL1C_PCIMAP_PAGE,
2183 			ATL1C_PCIMAP_TODEVICE);
2184 		use_tpd->buffer_addr = cpu_to_le64(buffer_info->dma);
2185 		use_tpd->buffer_len  = cpu_to_le16(buffer_info->length);
2186 	}
2187 
2188 	/* The last tpd */
2189 	use_tpd->word1 |= 1 << TPD_EOP_SHIFT;
2190 	/* The last buffer info contain the skb address,
2191 	   so it will be free after unmap */
2192 	buffer_info->skb = skb;
2193 
2194 	return 0;
2195 
2196 err_dma:
2197 	buffer_info->dma = 0;
2198 	buffer_info->length = 0;
2199 	return -1;
2200 }
2201 
2202 static void atl1c_tx_queue(struct atl1c_adapter *adapter, struct sk_buff *skb,
2203 			   struct atl1c_tpd_desc *tpd, enum atl1c_trans_queue type)
2204 {
2205 	struct atl1c_tpd_ring *tpd_ring = &adapter->tpd_ring[type];
2206 	u16 reg;
2207 
2208 	reg = type == atl1c_trans_high ? REG_TPD_PRI1_PIDX : REG_TPD_PRI0_PIDX;
2209 	AT_WRITE_REGW(&adapter->hw, reg, tpd_ring->next_to_use);
2210 }
2211 
2212 static netdev_tx_t atl1c_xmit_frame(struct sk_buff *skb,
2213 					  struct net_device *netdev)
2214 {
2215 	struct atl1c_adapter *adapter = netdev_priv(netdev);
2216 	u16 tpd_req = 1;
2217 	struct atl1c_tpd_desc *tpd;
2218 	enum atl1c_trans_queue type = atl1c_trans_normal;
2219 
2220 	if (test_bit(__AT_DOWN, &adapter->flags)) {
2221 		dev_kfree_skb_any(skb);
2222 		return NETDEV_TX_OK;
2223 	}
2224 
2225 	tpd_req = atl1c_cal_tpd_req(skb);
2226 
2227 	if (atl1c_tpd_avail(adapter, type) < tpd_req) {
2228 		/* no enough descriptor, just stop queue */
2229 		netif_stop_queue(netdev);
2230 		return NETDEV_TX_BUSY;
2231 	}
2232 
2233 	tpd = atl1c_get_tpd(adapter, type);
2234 
2235 	/* do TSO and check sum */
2236 	if (atl1c_tso_csum(adapter, skb, &tpd, type) != 0) {
2237 		dev_kfree_skb_any(skb);
2238 		return NETDEV_TX_OK;
2239 	}
2240 
2241 	if (unlikely(skb_vlan_tag_present(skb))) {
2242 		u16 vlan = skb_vlan_tag_get(skb);
2243 		__le16 tag;
2244 
2245 		vlan = cpu_to_le16(vlan);
2246 		AT_VLAN_TO_TAG(vlan, tag);
2247 		tpd->word1 |= 1 << TPD_INS_VTAG_SHIFT;
2248 		tpd->vlan_tag = tag;
2249 	}
2250 
2251 	if (skb_network_offset(skb) != ETH_HLEN)
2252 		tpd->word1 |= 1 << TPD_ETH_TYPE_SHIFT; /* Ethernet frame */
2253 
2254 	if (atl1c_tx_map(adapter, skb, tpd, type) < 0) {
2255 		netif_info(adapter, tx_done, adapter->netdev,
2256 			   "tx-skb dropped due to dma error\n");
2257 		/* roll back tpd/buffer */
2258 		atl1c_tx_rollback(adapter, tpd, type);
2259 		dev_kfree_skb_any(skb);
2260 	} else {
2261 		netdev_sent_queue(adapter->netdev, skb->len);
2262 		atl1c_tx_queue(adapter, skb, tpd, type);
2263 	}
2264 
2265 	return NETDEV_TX_OK;
2266 }
2267 
2268 static void atl1c_free_irq(struct atl1c_adapter *adapter)
2269 {
2270 	struct net_device *netdev = adapter->netdev;
2271 
2272 	free_irq(adapter->pdev->irq, netdev);
2273 
2274 	if (adapter->have_msi)
2275 		pci_disable_msi(adapter->pdev);
2276 }
2277 
2278 static int atl1c_request_irq(struct atl1c_adapter *adapter)
2279 {
2280 	struct pci_dev    *pdev   = adapter->pdev;
2281 	struct net_device *netdev = adapter->netdev;
2282 	int flags = 0;
2283 	int err = 0;
2284 
2285 	adapter->have_msi = true;
2286 	err = pci_enable_msi(adapter->pdev);
2287 	if (err) {
2288 		if (netif_msg_ifup(adapter))
2289 			dev_err(&pdev->dev,
2290 				"Unable to allocate MSI interrupt Error: %d\n",
2291 				err);
2292 		adapter->have_msi = false;
2293 	}
2294 
2295 	if (!adapter->have_msi)
2296 		flags |= IRQF_SHARED;
2297 	err = request_irq(adapter->pdev->irq, atl1c_intr, flags,
2298 			netdev->name, netdev);
2299 	if (err) {
2300 		if (netif_msg_ifup(adapter))
2301 			dev_err(&pdev->dev,
2302 				"Unable to allocate interrupt Error: %d\n",
2303 				err);
2304 		if (adapter->have_msi)
2305 			pci_disable_msi(adapter->pdev);
2306 		return err;
2307 	}
2308 	if (netif_msg_ifup(adapter))
2309 		dev_dbg(&pdev->dev, "atl1c_request_irq OK\n");
2310 	return err;
2311 }
2312 
2313 
2314 static void atl1c_reset_dma_ring(struct atl1c_adapter *adapter)
2315 {
2316 	/* release tx-pending skbs and reset tx/rx ring index */
2317 	atl1c_clean_tx_ring(adapter, atl1c_trans_normal);
2318 	atl1c_clean_tx_ring(adapter, atl1c_trans_high);
2319 	atl1c_clean_rx_ring(adapter);
2320 }
2321 
2322 static int atl1c_up(struct atl1c_adapter *adapter)
2323 {
2324 	struct net_device *netdev = adapter->netdev;
2325 	int err;
2326 
2327 	netif_carrier_off(netdev);
2328 
2329 	err = atl1c_configure(adapter);
2330 	if (unlikely(err))
2331 		goto err_up;
2332 
2333 	err = atl1c_request_irq(adapter);
2334 	if (unlikely(err))
2335 		goto err_up;
2336 
2337 	atl1c_check_link_status(adapter);
2338 	clear_bit(__AT_DOWN, &adapter->flags);
2339 	napi_enable(&adapter->napi);
2340 	atl1c_irq_enable(adapter);
2341 	netif_start_queue(netdev);
2342 	return err;
2343 
2344 err_up:
2345 	atl1c_clean_rx_ring(adapter);
2346 	return err;
2347 }
2348 
2349 static void atl1c_down(struct atl1c_adapter *adapter)
2350 {
2351 	struct net_device *netdev = adapter->netdev;
2352 
2353 	atl1c_del_timer(adapter);
2354 	adapter->work_event = 0; /* clear all event */
2355 	/* signal that we're down so the interrupt handler does not
2356 	 * reschedule our watchdog timer */
2357 	set_bit(__AT_DOWN, &adapter->flags);
2358 	netif_carrier_off(netdev);
2359 	napi_disable(&adapter->napi);
2360 	atl1c_irq_disable(adapter);
2361 	atl1c_free_irq(adapter);
2362 	/* disable ASPM if device inactive */
2363 	atl1c_disable_l0s_l1(&adapter->hw);
2364 	/* reset MAC to disable all RX/TX */
2365 	atl1c_reset_mac(&adapter->hw);
2366 	msleep(1);
2367 
2368 	adapter->link_speed = SPEED_0;
2369 	adapter->link_duplex = -1;
2370 	atl1c_reset_dma_ring(adapter);
2371 }
2372 
2373 /**
2374  * atl1c_open - Called when a network interface is made active
2375  * @netdev: network interface device structure
2376  *
2377  * Returns 0 on success, negative value on failure
2378  *
2379  * The open entry point is called when a network interface is made
2380  * active by the system (IFF_UP).  At this point all resources needed
2381  * for transmit and receive operations are allocated, the interrupt
2382  * handler is registered with the OS, the watchdog timer is started,
2383  * and the stack is notified that the interface is ready.
2384  */
2385 static int atl1c_open(struct net_device *netdev)
2386 {
2387 	struct atl1c_adapter *adapter = netdev_priv(netdev);
2388 	int err;
2389 
2390 	/* disallow open during test */
2391 	if (test_bit(__AT_TESTING, &adapter->flags))
2392 		return -EBUSY;
2393 
2394 	/* allocate rx/tx dma buffer & descriptors */
2395 	err = atl1c_setup_ring_resources(adapter);
2396 	if (unlikely(err))
2397 		return err;
2398 
2399 	err = atl1c_up(adapter);
2400 	if (unlikely(err))
2401 		goto err_up;
2402 
2403 	return 0;
2404 
2405 err_up:
2406 	atl1c_free_irq(adapter);
2407 	atl1c_free_ring_resources(adapter);
2408 	atl1c_reset_mac(&adapter->hw);
2409 	return err;
2410 }
2411 
2412 /**
2413  * atl1c_close - Disables a network interface
2414  * @netdev: network interface device structure
2415  *
2416  * Returns 0, this is not allowed to fail
2417  *
2418  * The close entry point is called when an interface is de-activated
2419  * by the OS.  The hardware is still under the drivers control, but
2420  * needs to be disabled.  A global MAC reset is issued to stop the
2421  * hardware, and all transmit and receive resources are freed.
2422  */
2423 static int atl1c_close(struct net_device *netdev)
2424 {
2425 	struct atl1c_adapter *adapter = netdev_priv(netdev);
2426 
2427 	WARN_ON(test_bit(__AT_RESETTING, &adapter->flags));
2428 	set_bit(__AT_DOWN, &adapter->flags);
2429 	cancel_work_sync(&adapter->common_task);
2430 	atl1c_down(adapter);
2431 	atl1c_free_ring_resources(adapter);
2432 	return 0;
2433 }
2434 
2435 static int atl1c_suspend(struct device *dev)
2436 {
2437 	struct pci_dev *pdev = to_pci_dev(dev);
2438 	struct net_device *netdev = pci_get_drvdata(pdev);
2439 	struct atl1c_adapter *adapter = netdev_priv(netdev);
2440 	struct atl1c_hw *hw = &adapter->hw;
2441 	u32 wufc = adapter->wol;
2442 
2443 	atl1c_disable_l0s_l1(hw);
2444 	if (netif_running(netdev)) {
2445 		WARN_ON(test_bit(__AT_RESETTING, &adapter->flags));
2446 		atl1c_down(adapter);
2447 	}
2448 	netif_device_detach(netdev);
2449 
2450 	if (wufc)
2451 		if (atl1c_phy_to_ps_link(hw) != 0)
2452 			dev_dbg(&pdev->dev, "phy power saving failed");
2453 
2454 	atl1c_power_saving(hw, wufc);
2455 
2456 	return 0;
2457 }
2458 
2459 #ifdef CONFIG_PM_SLEEP
2460 static int atl1c_resume(struct device *dev)
2461 {
2462 	struct pci_dev *pdev = to_pci_dev(dev);
2463 	struct net_device *netdev = pci_get_drvdata(pdev);
2464 	struct atl1c_adapter *adapter = netdev_priv(netdev);
2465 
2466 	AT_WRITE_REG(&adapter->hw, REG_WOL_CTRL, 0);
2467 	atl1c_reset_pcie(&adapter->hw, ATL1C_PCIE_L0S_L1_DISABLE);
2468 
2469 	atl1c_phy_reset(&adapter->hw);
2470 	atl1c_reset_mac(&adapter->hw);
2471 	atl1c_phy_init(&adapter->hw);
2472 
2473 #if 0
2474 	AT_READ_REG(&adapter->hw, REG_PM_CTRLSTAT, &pm_data);
2475 	pm_data &= ~PM_CTRLSTAT_PME_EN;
2476 	AT_WRITE_REG(&adapter->hw, REG_PM_CTRLSTAT, pm_data);
2477 #endif
2478 
2479 	netif_device_attach(netdev);
2480 	if (netif_running(netdev))
2481 		atl1c_up(adapter);
2482 
2483 	return 0;
2484 }
2485 #endif
2486 
2487 static void atl1c_shutdown(struct pci_dev *pdev)
2488 {
2489 	struct net_device *netdev = pci_get_drvdata(pdev);
2490 	struct atl1c_adapter *adapter = netdev_priv(netdev);
2491 
2492 	atl1c_suspend(&pdev->dev);
2493 	pci_wake_from_d3(pdev, adapter->wol);
2494 	pci_set_power_state(pdev, PCI_D3hot);
2495 }
2496 
2497 static const struct net_device_ops atl1c_netdev_ops = {
2498 	.ndo_open		= atl1c_open,
2499 	.ndo_stop		= atl1c_close,
2500 	.ndo_validate_addr	= eth_validate_addr,
2501 	.ndo_start_xmit		= atl1c_xmit_frame,
2502 	.ndo_set_mac_address	= atl1c_set_mac_addr,
2503 	.ndo_set_rx_mode	= atl1c_set_multi,
2504 	.ndo_change_mtu		= atl1c_change_mtu,
2505 	.ndo_fix_features	= atl1c_fix_features,
2506 	.ndo_set_features	= atl1c_set_features,
2507 	.ndo_do_ioctl		= atl1c_ioctl,
2508 	.ndo_tx_timeout		= atl1c_tx_timeout,
2509 	.ndo_get_stats		= atl1c_get_stats,
2510 #ifdef CONFIG_NET_POLL_CONTROLLER
2511 	.ndo_poll_controller	= atl1c_netpoll,
2512 #endif
2513 };
2514 
2515 static int atl1c_init_netdev(struct net_device *netdev, struct pci_dev *pdev)
2516 {
2517 	SET_NETDEV_DEV(netdev, &pdev->dev);
2518 	pci_set_drvdata(pdev, netdev);
2519 
2520 	netdev->netdev_ops = &atl1c_netdev_ops;
2521 	netdev->watchdog_timeo = AT_TX_WATCHDOG;
2522 	netdev->min_mtu = ETH_ZLEN - (ETH_HLEN + VLAN_HLEN);
2523 	atl1c_set_ethtool_ops(netdev);
2524 
2525 	/* TODO: add when ready */
2526 	netdev->hw_features =	NETIF_F_SG		|
2527 				NETIF_F_HW_CSUM		|
2528 				NETIF_F_HW_VLAN_CTAG_RX	|
2529 				NETIF_F_TSO		|
2530 				NETIF_F_TSO6;
2531 	netdev->features =	netdev->hw_features	|
2532 				NETIF_F_HW_VLAN_CTAG_TX;
2533 	return 0;
2534 }
2535 
2536 /**
2537  * atl1c_probe - Device Initialization Routine
2538  * @pdev: PCI device information struct
2539  * @ent: entry in atl1c_pci_tbl
2540  *
2541  * Returns 0 on success, negative on failure
2542  *
2543  * atl1c_probe initializes an adapter identified by a pci_dev structure.
2544  * The OS initialization, configuring of the adapter private structure,
2545  * and a hardware reset occur.
2546  */
2547 static int atl1c_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
2548 {
2549 	struct net_device *netdev;
2550 	struct atl1c_adapter *adapter;
2551 	static int cards_found;
2552 
2553 	int err = 0;
2554 
2555 	/* enable device (incl. PCI PM wakeup and hotplug setup) */
2556 	err = pci_enable_device_mem(pdev);
2557 	if (err) {
2558 		dev_err(&pdev->dev, "cannot enable PCI device\n");
2559 		return err;
2560 	}
2561 
2562 	/*
2563 	 * The atl1c chip can DMA to 64-bit addresses, but it uses a single
2564 	 * shared register for the high 32 bits, so only a single, aligned,
2565 	 * 4 GB physical address range can be used at a time.
2566 	 *
2567 	 * Supporting 64-bit DMA on this hardware is more trouble than it's
2568 	 * worth.  It is far easier to limit to 32-bit DMA than update
2569 	 * various kernel subsystems to support the mechanics required by a
2570 	 * fixed-high-32-bit system.
2571 	 */
2572 	if ((pci_set_dma_mask(pdev, DMA_BIT_MASK(32)) != 0) ||
2573 	    (pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32)) != 0)) {
2574 		dev_err(&pdev->dev, "No usable DMA configuration,aborting\n");
2575 		goto err_dma;
2576 	}
2577 
2578 	err = pci_request_regions(pdev, atl1c_driver_name);
2579 	if (err) {
2580 		dev_err(&pdev->dev, "cannot obtain PCI resources\n");
2581 		goto err_pci_reg;
2582 	}
2583 
2584 	pci_set_master(pdev);
2585 
2586 	netdev = alloc_etherdev(sizeof(struct atl1c_adapter));
2587 	if (netdev == NULL) {
2588 		err = -ENOMEM;
2589 		goto err_alloc_etherdev;
2590 	}
2591 
2592 	err = atl1c_init_netdev(netdev, pdev);
2593 	if (err) {
2594 		dev_err(&pdev->dev, "init netdevice failed\n");
2595 		goto err_init_netdev;
2596 	}
2597 	adapter = netdev_priv(netdev);
2598 	adapter->bd_number = cards_found;
2599 	adapter->netdev = netdev;
2600 	adapter->pdev = pdev;
2601 	adapter->hw.adapter = adapter;
2602 	adapter->msg_enable = netif_msg_init(-1, atl1c_default_msg);
2603 	adapter->hw.hw_addr = ioremap(pci_resource_start(pdev, 0), pci_resource_len(pdev, 0));
2604 	if (!adapter->hw.hw_addr) {
2605 		err = -EIO;
2606 		dev_err(&pdev->dev, "cannot map device registers\n");
2607 		goto err_ioremap;
2608 	}
2609 
2610 	/* init mii data */
2611 	adapter->mii.dev = netdev;
2612 	adapter->mii.mdio_read  = atl1c_mdio_read;
2613 	adapter->mii.mdio_write = atl1c_mdio_write;
2614 	adapter->mii.phy_id_mask = 0x1f;
2615 	adapter->mii.reg_num_mask = MDIO_CTRL_REG_MASK;
2616 	netif_napi_add(netdev, &adapter->napi, atl1c_clean, 64);
2617 	timer_setup(&adapter->phy_config_timer, atl1c_phy_config, 0);
2618 	/* setup the private structure */
2619 	err = atl1c_sw_init(adapter);
2620 	if (err) {
2621 		dev_err(&pdev->dev, "net device private data init failed\n");
2622 		goto err_sw_init;
2623 	}
2624 	/* set max MTU */
2625 	atl1c_set_max_mtu(netdev);
2626 
2627 	atl1c_reset_pcie(&adapter->hw, ATL1C_PCIE_L0S_L1_DISABLE);
2628 
2629 	/* Init GPHY as early as possible due to power saving issue  */
2630 	atl1c_phy_reset(&adapter->hw);
2631 
2632 	err = atl1c_reset_mac(&adapter->hw);
2633 	if (err) {
2634 		err = -EIO;
2635 		goto err_reset;
2636 	}
2637 
2638 	/* reset the controller to
2639 	 * put the device in a known good starting state */
2640 	err = atl1c_phy_init(&adapter->hw);
2641 	if (err) {
2642 		err = -EIO;
2643 		goto err_reset;
2644 	}
2645 	if (atl1c_read_mac_addr(&adapter->hw)) {
2646 		/* got a random MAC address, set NET_ADDR_RANDOM to netdev */
2647 		netdev->addr_assign_type = NET_ADDR_RANDOM;
2648 	}
2649 	memcpy(netdev->dev_addr, adapter->hw.mac_addr, netdev->addr_len);
2650 	if (netif_msg_probe(adapter))
2651 		dev_dbg(&pdev->dev, "mac address : %pM\n",
2652 			adapter->hw.mac_addr);
2653 
2654 	atl1c_hw_set_mac_addr(&adapter->hw, adapter->hw.mac_addr);
2655 	INIT_WORK(&adapter->common_task, atl1c_common_task);
2656 	adapter->work_event = 0;
2657 	err = register_netdev(netdev);
2658 	if (err) {
2659 		dev_err(&pdev->dev, "register netdevice failed\n");
2660 		goto err_register;
2661 	}
2662 
2663 	if (netif_msg_probe(adapter))
2664 		dev_info(&pdev->dev, "version %s\n", ATL1C_DRV_VERSION);
2665 	cards_found++;
2666 	return 0;
2667 
2668 err_reset:
2669 err_register:
2670 err_sw_init:
2671 	iounmap(adapter->hw.hw_addr);
2672 err_init_netdev:
2673 err_ioremap:
2674 	free_netdev(netdev);
2675 err_alloc_etherdev:
2676 	pci_release_regions(pdev);
2677 err_pci_reg:
2678 err_dma:
2679 	pci_disable_device(pdev);
2680 	return err;
2681 }
2682 
2683 /**
2684  * atl1c_remove - Device Removal Routine
2685  * @pdev: PCI device information struct
2686  *
2687  * atl1c_remove is called by the PCI subsystem to alert the driver
2688  * that it should release a PCI device.  The could be caused by a
2689  * Hot-Plug event, or because the driver is going to be removed from
2690  * memory.
2691  */
2692 static void atl1c_remove(struct pci_dev *pdev)
2693 {
2694 	struct net_device *netdev = pci_get_drvdata(pdev);
2695 	struct atl1c_adapter *adapter = netdev_priv(netdev);
2696 
2697 	unregister_netdev(netdev);
2698 	/* restore permanent address */
2699 	atl1c_hw_set_mac_addr(&adapter->hw, adapter->hw.perm_mac_addr);
2700 	atl1c_phy_disable(&adapter->hw);
2701 
2702 	iounmap(adapter->hw.hw_addr);
2703 
2704 	pci_release_regions(pdev);
2705 	pci_disable_device(pdev);
2706 	free_netdev(netdev);
2707 }
2708 
2709 /**
2710  * atl1c_io_error_detected - called when PCI error is detected
2711  * @pdev: Pointer to PCI device
2712  * @state: The current pci connection state
2713  *
2714  * This function is called after a PCI bus error affecting
2715  * this device has been detected.
2716  */
2717 static pci_ers_result_t atl1c_io_error_detected(struct pci_dev *pdev,
2718 						pci_channel_state_t state)
2719 {
2720 	struct net_device *netdev = pci_get_drvdata(pdev);
2721 	struct atl1c_adapter *adapter = netdev_priv(netdev);
2722 
2723 	netif_device_detach(netdev);
2724 
2725 	if (state == pci_channel_io_perm_failure)
2726 		return PCI_ERS_RESULT_DISCONNECT;
2727 
2728 	if (netif_running(netdev))
2729 		atl1c_down(adapter);
2730 
2731 	pci_disable_device(pdev);
2732 
2733 	/* Request a slot slot reset. */
2734 	return PCI_ERS_RESULT_NEED_RESET;
2735 }
2736 
2737 /**
2738  * atl1c_io_slot_reset - called after the pci bus has been reset.
2739  * @pdev: Pointer to PCI device
2740  *
2741  * Restart the card from scratch, as if from a cold-boot. Implementation
2742  * resembles the first-half of the e1000_resume routine.
2743  */
2744 static pci_ers_result_t atl1c_io_slot_reset(struct pci_dev *pdev)
2745 {
2746 	struct net_device *netdev = pci_get_drvdata(pdev);
2747 	struct atl1c_adapter *adapter = netdev_priv(netdev);
2748 
2749 	if (pci_enable_device(pdev)) {
2750 		if (netif_msg_hw(adapter))
2751 			dev_err(&pdev->dev,
2752 				"Cannot re-enable PCI device after reset\n");
2753 		return PCI_ERS_RESULT_DISCONNECT;
2754 	}
2755 	pci_set_master(pdev);
2756 
2757 	pci_enable_wake(pdev, PCI_D3hot, 0);
2758 	pci_enable_wake(pdev, PCI_D3cold, 0);
2759 
2760 	atl1c_reset_mac(&adapter->hw);
2761 
2762 	return PCI_ERS_RESULT_RECOVERED;
2763 }
2764 
2765 /**
2766  * atl1c_io_resume - called when traffic can start flowing again.
2767  * @pdev: Pointer to PCI device
2768  *
2769  * This callback is called when the error recovery driver tells us that
2770  * its OK to resume normal operation. Implementation resembles the
2771  * second-half of the atl1c_resume routine.
2772  */
2773 static void atl1c_io_resume(struct pci_dev *pdev)
2774 {
2775 	struct net_device *netdev = pci_get_drvdata(pdev);
2776 	struct atl1c_adapter *adapter = netdev_priv(netdev);
2777 
2778 	if (netif_running(netdev)) {
2779 		if (atl1c_up(adapter)) {
2780 			if (netif_msg_hw(adapter))
2781 				dev_err(&pdev->dev,
2782 					"Cannot bring device back up after reset\n");
2783 			return;
2784 		}
2785 	}
2786 
2787 	netif_device_attach(netdev);
2788 }
2789 
2790 static const struct pci_error_handlers atl1c_err_handler = {
2791 	.error_detected = atl1c_io_error_detected,
2792 	.slot_reset = atl1c_io_slot_reset,
2793 	.resume = atl1c_io_resume,
2794 };
2795 
2796 static SIMPLE_DEV_PM_OPS(atl1c_pm_ops, atl1c_suspend, atl1c_resume);
2797 
2798 static struct pci_driver atl1c_driver = {
2799 	.name     = atl1c_driver_name,
2800 	.id_table = atl1c_pci_tbl,
2801 	.probe    = atl1c_probe,
2802 	.remove   = atl1c_remove,
2803 	.shutdown = atl1c_shutdown,
2804 	.err_handler = &atl1c_err_handler,
2805 	.driver.pm = &atl1c_pm_ops,
2806 };
2807 
2808 module_pci_driver(atl1c_driver);
2809