1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * Copyright(c) 2008 - 2009 Atheros Corporation. All rights reserved.
4  *
5  * Derived from Intel e1000 driver
6  * Copyright(c) 1999 - 2005 Intel Corporation. All rights reserved.
7  */
8 
9 #include "atl1c.h"
10 
11 char atl1c_driver_name[] = "atl1c";
12 
13 /*
14  * atl1c_pci_tbl - PCI Device ID Table
15  *
16  * Wildcard entries (PCI_ANY_ID) should come last
17  * Last entry must be all 0s
18  *
19  * { Vendor ID, Device ID, SubVendor ID, SubDevice ID,
20  *   Class, Class Mask, private data (not used) }
21  */
22 static const struct pci_device_id atl1c_pci_tbl[] = {
23 	{PCI_DEVICE(PCI_VENDOR_ID_ATTANSIC, PCI_DEVICE_ID_ATTANSIC_L1C)},
24 	{PCI_DEVICE(PCI_VENDOR_ID_ATTANSIC, PCI_DEVICE_ID_ATTANSIC_L2C)},
25 	{PCI_DEVICE(PCI_VENDOR_ID_ATTANSIC, PCI_DEVICE_ID_ATHEROS_L2C_B)},
26 	{PCI_DEVICE(PCI_VENDOR_ID_ATTANSIC, PCI_DEVICE_ID_ATHEROS_L2C_B2)},
27 	{PCI_DEVICE(PCI_VENDOR_ID_ATTANSIC, PCI_DEVICE_ID_ATHEROS_L1D)},
28 	{PCI_DEVICE(PCI_VENDOR_ID_ATTANSIC, PCI_DEVICE_ID_ATHEROS_L1D_2_0)},
29 	/* required last entry */
30 	{ 0 }
31 };
32 MODULE_DEVICE_TABLE(pci, atl1c_pci_tbl);
33 
34 MODULE_AUTHOR("Jie Yang");
35 MODULE_AUTHOR("Qualcomm Atheros Inc., <nic-devel@qualcomm.com>");
36 MODULE_DESCRIPTION("Qualcomm Atheros 100/1000M Ethernet Network Driver");
37 MODULE_LICENSE("GPL");
38 
39 static int atl1c_stop_mac(struct atl1c_hw *hw);
40 static void atl1c_disable_l0s_l1(struct atl1c_hw *hw);
41 static void atl1c_set_aspm(struct atl1c_hw *hw, u16 link_speed);
42 static void atl1c_start_mac(struct atl1c_adapter *adapter);
43 static void atl1c_clean_rx_irq(struct atl1c_adapter *adapter,
44 		   int *work_done, int work_to_do);
45 static int atl1c_up(struct atl1c_adapter *adapter);
46 static void atl1c_down(struct atl1c_adapter *adapter);
47 static int atl1c_reset_mac(struct atl1c_hw *hw);
48 static void atl1c_reset_dma_ring(struct atl1c_adapter *adapter);
49 static int atl1c_configure(struct atl1c_adapter *adapter);
50 static int atl1c_alloc_rx_buffer(struct atl1c_adapter *adapter);
51 
52 
53 static const u32 atl1c_default_msg = NETIF_MSG_DRV | NETIF_MSG_PROBE |
54 	NETIF_MSG_LINK | NETIF_MSG_TIMER | NETIF_MSG_IFDOWN | NETIF_MSG_IFUP;
55 static void atl1c_pcie_patch(struct atl1c_hw *hw)
56 {
57 	u32 mst_data, data;
58 
59 	/* pclk sel could switch to 25M */
60 	AT_READ_REG(hw, REG_MASTER_CTRL, &mst_data);
61 	mst_data &= ~MASTER_CTRL_CLK_SEL_DIS;
62 	AT_WRITE_REG(hw, REG_MASTER_CTRL, mst_data);
63 
64 	/* WoL/PCIE related settings */
65 	if (hw->nic_type == athr_l1c || hw->nic_type == athr_l2c) {
66 		AT_READ_REG(hw, REG_PCIE_PHYMISC, &data);
67 		data |= PCIE_PHYMISC_FORCE_RCV_DET;
68 		AT_WRITE_REG(hw, REG_PCIE_PHYMISC, data);
69 	} else { /* new dev set bit5 of MASTER */
70 		if (!(mst_data & MASTER_CTRL_WAKEN_25M))
71 			AT_WRITE_REG(hw, REG_MASTER_CTRL,
72 				mst_data | MASTER_CTRL_WAKEN_25M);
73 	}
74 	/* aspm/PCIE setting only for l2cb 1.0 */
75 	if (hw->nic_type == athr_l2c_b && hw->revision_id == L2CB_V10) {
76 		AT_READ_REG(hw, REG_PCIE_PHYMISC2, &data);
77 		data = FIELD_SETX(data, PCIE_PHYMISC2_CDR_BW,
78 			L2CB1_PCIE_PHYMISC2_CDR_BW);
79 		data = FIELD_SETX(data, PCIE_PHYMISC2_L0S_TH,
80 			L2CB1_PCIE_PHYMISC2_L0S_TH);
81 		AT_WRITE_REG(hw, REG_PCIE_PHYMISC2, data);
82 		/* extend L1 sync timer */
83 		AT_READ_REG(hw, REG_LINK_CTRL, &data);
84 		data |= LINK_CTRL_EXT_SYNC;
85 		AT_WRITE_REG(hw, REG_LINK_CTRL, data);
86 	}
87 	/* l2cb 1.x & l1d 1.x */
88 	if (hw->nic_type == athr_l2c_b || hw->nic_type == athr_l1d) {
89 		AT_READ_REG(hw, REG_PM_CTRL, &data);
90 		data |= PM_CTRL_L0S_BUFSRX_EN;
91 		AT_WRITE_REG(hw, REG_PM_CTRL, data);
92 		/* clear vendor msg */
93 		AT_READ_REG(hw, REG_DMA_DBG, &data);
94 		AT_WRITE_REG(hw, REG_DMA_DBG, data & ~DMA_DBG_VENDOR_MSG);
95 	}
96 }
97 
98 /* FIXME: no need any more ? */
99 /*
100  * atl1c_init_pcie - init PCIE module
101  */
102 static void atl1c_reset_pcie(struct atl1c_hw *hw, u32 flag)
103 {
104 	u32 data;
105 	u32 pci_cmd;
106 	struct pci_dev *pdev = hw->adapter->pdev;
107 	int pos;
108 
109 	AT_READ_REG(hw, PCI_COMMAND, &pci_cmd);
110 	pci_cmd &= ~PCI_COMMAND_INTX_DISABLE;
111 	pci_cmd |= (PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER |
112 		PCI_COMMAND_IO);
113 	AT_WRITE_REG(hw, PCI_COMMAND, pci_cmd);
114 
115 	/*
116 	 * Clear any PowerSaveing Settings
117 	 */
118 	pci_enable_wake(pdev, PCI_D3hot, 0);
119 	pci_enable_wake(pdev, PCI_D3cold, 0);
120 	/* wol sts read-clear */
121 	AT_READ_REG(hw, REG_WOL_CTRL, &data);
122 	AT_WRITE_REG(hw, REG_WOL_CTRL, 0);
123 
124 	/*
125 	 * Mask some pcie error bits
126 	 */
127 	pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_ERR);
128 	if (pos) {
129 		pci_read_config_dword(pdev, pos + PCI_ERR_UNCOR_SEVER, &data);
130 		data &= ~(PCI_ERR_UNC_DLP | PCI_ERR_UNC_FCP);
131 		pci_write_config_dword(pdev, pos + PCI_ERR_UNCOR_SEVER, data);
132 	}
133 	/* clear error status */
134 	pcie_capability_write_word(pdev, PCI_EXP_DEVSTA,
135 			PCI_EXP_DEVSTA_NFED |
136 			PCI_EXP_DEVSTA_FED |
137 			PCI_EXP_DEVSTA_CED |
138 			PCI_EXP_DEVSTA_URD);
139 
140 	AT_READ_REG(hw, REG_LTSSM_ID_CTRL, &data);
141 	data &= ~LTSSM_ID_EN_WRO;
142 	AT_WRITE_REG(hw, REG_LTSSM_ID_CTRL, data);
143 
144 	atl1c_pcie_patch(hw);
145 	if (flag & ATL1C_PCIE_L0S_L1_DISABLE)
146 		atl1c_disable_l0s_l1(hw);
147 
148 	msleep(5);
149 }
150 
151 /**
152  * atl1c_irq_enable - Enable default interrupt generation settings
153  * @adapter: board private structure
154  */
155 static inline void atl1c_irq_enable(struct atl1c_adapter *adapter)
156 {
157 	if (likely(atomic_dec_and_test(&adapter->irq_sem))) {
158 		AT_WRITE_REG(&adapter->hw, REG_ISR, 0x7FFFFFFF);
159 		AT_WRITE_REG(&adapter->hw, REG_IMR, adapter->hw.intr_mask);
160 		AT_WRITE_FLUSH(&adapter->hw);
161 	}
162 }
163 
164 /**
165  * atl1c_irq_disable - Mask off interrupt generation on the NIC
166  * @adapter: board private structure
167  */
168 static inline void atl1c_irq_disable(struct atl1c_adapter *adapter)
169 {
170 	atomic_inc(&adapter->irq_sem);
171 	AT_WRITE_REG(&adapter->hw, REG_IMR, 0);
172 	AT_WRITE_REG(&adapter->hw, REG_ISR, ISR_DIS_INT);
173 	AT_WRITE_FLUSH(&adapter->hw);
174 	synchronize_irq(adapter->pdev->irq);
175 }
176 
177 /**
178  * atl1c_irq_reset - reset interrupt confiure on the NIC
179  * @adapter: board private structure
180  */
181 static inline void atl1c_irq_reset(struct atl1c_adapter *adapter)
182 {
183 	atomic_set(&adapter->irq_sem, 1);
184 	atl1c_irq_enable(adapter);
185 }
186 
187 /*
188  * atl1c_wait_until_idle - wait up to AT_HW_MAX_IDLE_DELAY reads
189  * of the idle status register until the device is actually idle
190  */
191 static u32 atl1c_wait_until_idle(struct atl1c_hw *hw, u32 modu_ctrl)
192 {
193 	int timeout;
194 	u32 data;
195 
196 	for (timeout = 0; timeout < AT_HW_MAX_IDLE_DELAY; timeout++) {
197 		AT_READ_REG(hw, REG_IDLE_STATUS, &data);
198 		if ((data & modu_ctrl) == 0)
199 			return 0;
200 		msleep(1);
201 	}
202 	return data;
203 }
204 
205 /**
206  * atl1c_phy_config - Timer Call-back
207  * @data: pointer to netdev cast into an unsigned long
208  */
209 static void atl1c_phy_config(struct timer_list *t)
210 {
211 	struct atl1c_adapter *adapter = from_timer(adapter, t,
212 						   phy_config_timer);
213 	struct atl1c_hw *hw = &adapter->hw;
214 	unsigned long flags;
215 
216 	spin_lock_irqsave(&adapter->mdio_lock, flags);
217 	atl1c_restart_autoneg(hw);
218 	spin_unlock_irqrestore(&adapter->mdio_lock, flags);
219 }
220 
221 void atl1c_reinit_locked(struct atl1c_adapter *adapter)
222 {
223 	WARN_ON(in_interrupt());
224 	atl1c_down(adapter);
225 	atl1c_up(adapter);
226 	clear_bit(__AT_RESETTING, &adapter->flags);
227 }
228 
229 static void atl1c_check_link_status(struct atl1c_adapter *adapter)
230 {
231 	struct atl1c_hw *hw = &adapter->hw;
232 	struct net_device *netdev = adapter->netdev;
233 	struct pci_dev    *pdev   = adapter->pdev;
234 	int err;
235 	unsigned long flags;
236 	u16 speed, duplex, phy_data;
237 
238 	spin_lock_irqsave(&adapter->mdio_lock, flags);
239 	/* MII_BMSR must read twise */
240 	atl1c_read_phy_reg(hw, MII_BMSR, &phy_data);
241 	atl1c_read_phy_reg(hw, MII_BMSR, &phy_data);
242 	spin_unlock_irqrestore(&adapter->mdio_lock, flags);
243 
244 	if ((phy_data & BMSR_LSTATUS) == 0) {
245 		/* link down */
246 		netif_carrier_off(netdev);
247 		hw->hibernate = true;
248 		if (atl1c_reset_mac(hw) != 0)
249 			if (netif_msg_hw(adapter))
250 				dev_warn(&pdev->dev, "reset mac failed\n");
251 		atl1c_set_aspm(hw, SPEED_0);
252 		atl1c_post_phy_linkchg(hw, SPEED_0);
253 		atl1c_reset_dma_ring(adapter);
254 		atl1c_configure(adapter);
255 	} else {
256 		/* Link Up */
257 		hw->hibernate = false;
258 		spin_lock_irqsave(&adapter->mdio_lock, flags);
259 		err = atl1c_get_speed_and_duplex(hw, &speed, &duplex);
260 		spin_unlock_irqrestore(&adapter->mdio_lock, flags);
261 		if (unlikely(err))
262 			return;
263 		/* link result is our setting */
264 		if (adapter->link_speed != speed ||
265 		    adapter->link_duplex != duplex) {
266 			adapter->link_speed  = speed;
267 			adapter->link_duplex = duplex;
268 			atl1c_set_aspm(hw, speed);
269 			atl1c_post_phy_linkchg(hw, speed);
270 			atl1c_start_mac(adapter);
271 			if (netif_msg_link(adapter))
272 				dev_info(&pdev->dev,
273 					"%s: %s NIC Link is Up<%d Mbps %s>\n",
274 					atl1c_driver_name, netdev->name,
275 					adapter->link_speed,
276 					adapter->link_duplex == FULL_DUPLEX ?
277 					"Full Duplex" : "Half Duplex");
278 		}
279 		if (!netif_carrier_ok(netdev))
280 			netif_carrier_on(netdev);
281 	}
282 }
283 
284 static void atl1c_link_chg_event(struct atl1c_adapter *adapter)
285 {
286 	struct net_device *netdev = adapter->netdev;
287 	struct pci_dev    *pdev   = adapter->pdev;
288 	u16 phy_data;
289 	u16 link_up;
290 
291 	spin_lock(&adapter->mdio_lock);
292 	atl1c_read_phy_reg(&adapter->hw, MII_BMSR, &phy_data);
293 	atl1c_read_phy_reg(&adapter->hw, MII_BMSR, &phy_data);
294 	spin_unlock(&adapter->mdio_lock);
295 	link_up = phy_data & BMSR_LSTATUS;
296 	/* notify upper layer link down ASAP */
297 	if (!link_up) {
298 		if (netif_carrier_ok(netdev)) {
299 			/* old link state: Up */
300 			netif_carrier_off(netdev);
301 			if (netif_msg_link(adapter))
302 				dev_info(&pdev->dev,
303 					"%s: %s NIC Link is Down\n",
304 					atl1c_driver_name, netdev->name);
305 			adapter->link_speed = SPEED_0;
306 		}
307 	}
308 
309 	set_bit(ATL1C_WORK_EVENT_LINK_CHANGE, &adapter->work_event);
310 	schedule_work(&adapter->common_task);
311 }
312 
313 static void atl1c_common_task(struct work_struct *work)
314 {
315 	struct atl1c_adapter *adapter;
316 	struct net_device *netdev;
317 
318 	adapter = container_of(work, struct atl1c_adapter, common_task);
319 	netdev = adapter->netdev;
320 
321 	if (test_bit(__AT_DOWN, &adapter->flags))
322 		return;
323 
324 	if (test_and_clear_bit(ATL1C_WORK_EVENT_RESET, &adapter->work_event)) {
325 		netif_device_detach(netdev);
326 		atl1c_down(adapter);
327 		atl1c_up(adapter);
328 		netif_device_attach(netdev);
329 	}
330 
331 	if (test_and_clear_bit(ATL1C_WORK_EVENT_LINK_CHANGE,
332 		&adapter->work_event)) {
333 		atl1c_irq_disable(adapter);
334 		atl1c_check_link_status(adapter);
335 		atl1c_irq_enable(adapter);
336 	}
337 }
338 
339 
340 static void atl1c_del_timer(struct atl1c_adapter *adapter)
341 {
342 	del_timer_sync(&adapter->phy_config_timer);
343 }
344 
345 
346 /**
347  * atl1c_tx_timeout - Respond to a Tx Hang
348  * @netdev: network interface device structure
349  */
350 static void atl1c_tx_timeout(struct net_device *netdev, unsigned int txqueue)
351 {
352 	struct atl1c_adapter *adapter = netdev_priv(netdev);
353 
354 	/* Do the reset outside of interrupt context */
355 	set_bit(ATL1C_WORK_EVENT_RESET, &adapter->work_event);
356 	schedule_work(&adapter->common_task);
357 }
358 
359 /**
360  * atl1c_set_multi - Multicast and Promiscuous mode set
361  * @netdev: network interface device structure
362  *
363  * The set_multi entry point is called whenever the multicast address
364  * list or the network interface flags are updated.  This routine is
365  * responsible for configuring the hardware for proper multicast,
366  * promiscuous mode, and all-multi behavior.
367  */
368 static void atl1c_set_multi(struct net_device *netdev)
369 {
370 	struct atl1c_adapter *adapter = netdev_priv(netdev);
371 	struct atl1c_hw *hw = &adapter->hw;
372 	struct netdev_hw_addr *ha;
373 	u32 mac_ctrl_data;
374 	u32 hash_value;
375 
376 	/* Check for Promiscuous and All Multicast modes */
377 	AT_READ_REG(hw, REG_MAC_CTRL, &mac_ctrl_data);
378 
379 	if (netdev->flags & IFF_PROMISC) {
380 		mac_ctrl_data |= MAC_CTRL_PROMIS_EN;
381 	} else if (netdev->flags & IFF_ALLMULTI) {
382 		mac_ctrl_data |= MAC_CTRL_MC_ALL_EN;
383 		mac_ctrl_data &= ~MAC_CTRL_PROMIS_EN;
384 	} else {
385 		mac_ctrl_data &= ~(MAC_CTRL_PROMIS_EN | MAC_CTRL_MC_ALL_EN);
386 	}
387 
388 	AT_WRITE_REG(hw, REG_MAC_CTRL, mac_ctrl_data);
389 
390 	/* clear the old settings from the multicast hash table */
391 	AT_WRITE_REG(hw, REG_RX_HASH_TABLE, 0);
392 	AT_WRITE_REG_ARRAY(hw, REG_RX_HASH_TABLE, 1, 0);
393 
394 	/* comoute mc addresses' hash value ,and put it into hash table */
395 	netdev_for_each_mc_addr(ha, netdev) {
396 		hash_value = atl1c_hash_mc_addr(hw, ha->addr);
397 		atl1c_hash_set(hw, hash_value);
398 	}
399 }
400 
401 static void __atl1c_vlan_mode(netdev_features_t features, u32 *mac_ctrl_data)
402 {
403 	if (features & NETIF_F_HW_VLAN_CTAG_RX) {
404 		/* enable VLAN tag insert/strip */
405 		*mac_ctrl_data |= MAC_CTRL_RMV_VLAN;
406 	} else {
407 		/* disable VLAN tag insert/strip */
408 		*mac_ctrl_data &= ~MAC_CTRL_RMV_VLAN;
409 	}
410 }
411 
412 static void atl1c_vlan_mode(struct net_device *netdev,
413 	netdev_features_t features)
414 {
415 	struct atl1c_adapter *adapter = netdev_priv(netdev);
416 	struct pci_dev *pdev = adapter->pdev;
417 	u32 mac_ctrl_data = 0;
418 
419 	if (netif_msg_pktdata(adapter))
420 		dev_dbg(&pdev->dev, "atl1c_vlan_mode\n");
421 
422 	atl1c_irq_disable(adapter);
423 	AT_READ_REG(&adapter->hw, REG_MAC_CTRL, &mac_ctrl_data);
424 	__atl1c_vlan_mode(features, &mac_ctrl_data);
425 	AT_WRITE_REG(&adapter->hw, REG_MAC_CTRL, mac_ctrl_data);
426 	atl1c_irq_enable(adapter);
427 }
428 
429 static void atl1c_restore_vlan(struct atl1c_adapter *adapter)
430 {
431 	struct pci_dev *pdev = adapter->pdev;
432 
433 	if (netif_msg_pktdata(adapter))
434 		dev_dbg(&pdev->dev, "atl1c_restore_vlan\n");
435 	atl1c_vlan_mode(adapter->netdev, adapter->netdev->features);
436 }
437 
438 /**
439  * atl1c_set_mac - Change the Ethernet Address of the NIC
440  * @netdev: network interface device structure
441  * @p: pointer to an address structure
442  *
443  * Returns 0 on success, negative on failure
444  */
445 static int atl1c_set_mac_addr(struct net_device *netdev, void *p)
446 {
447 	struct atl1c_adapter *adapter = netdev_priv(netdev);
448 	struct sockaddr *addr = p;
449 
450 	if (!is_valid_ether_addr(addr->sa_data))
451 		return -EADDRNOTAVAIL;
452 
453 	if (netif_running(netdev))
454 		return -EBUSY;
455 
456 	memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
457 	memcpy(adapter->hw.mac_addr, addr->sa_data, netdev->addr_len);
458 
459 	atl1c_hw_set_mac_addr(&adapter->hw, adapter->hw.mac_addr);
460 
461 	return 0;
462 }
463 
464 static void atl1c_set_rxbufsize(struct atl1c_adapter *adapter,
465 				struct net_device *dev)
466 {
467 	unsigned int head_size;
468 	int mtu = dev->mtu;
469 
470 	adapter->rx_buffer_len = mtu > AT_RX_BUF_SIZE ?
471 		roundup(mtu + ETH_HLEN + ETH_FCS_LEN + VLAN_HLEN, 8) : AT_RX_BUF_SIZE;
472 
473 	head_size = SKB_DATA_ALIGN(adapter->rx_buffer_len + NET_SKB_PAD) +
474 		    SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
475 	adapter->rx_frag_size = roundup_pow_of_two(head_size);
476 }
477 
478 static netdev_features_t atl1c_fix_features(struct net_device *netdev,
479 	netdev_features_t features)
480 {
481 	/*
482 	 * Since there is no support for separate rx/tx vlan accel
483 	 * enable/disable make sure tx flag is always in same state as rx.
484 	 */
485 	if (features & NETIF_F_HW_VLAN_CTAG_RX)
486 		features |= NETIF_F_HW_VLAN_CTAG_TX;
487 	else
488 		features &= ~NETIF_F_HW_VLAN_CTAG_TX;
489 
490 	if (netdev->mtu > MAX_TSO_FRAME_SIZE)
491 		features &= ~(NETIF_F_TSO | NETIF_F_TSO6);
492 
493 	return features;
494 }
495 
496 static int atl1c_set_features(struct net_device *netdev,
497 	netdev_features_t features)
498 {
499 	netdev_features_t changed = netdev->features ^ features;
500 
501 	if (changed & NETIF_F_HW_VLAN_CTAG_RX)
502 		atl1c_vlan_mode(netdev, features);
503 
504 	return 0;
505 }
506 
507 static void atl1c_set_max_mtu(struct net_device *netdev)
508 {
509 	struct atl1c_adapter *adapter = netdev_priv(netdev);
510 	struct atl1c_hw *hw = &adapter->hw;
511 
512 	switch (hw->nic_type) {
513 	/* These (GbE) devices support jumbo packets, max_mtu 6122 */
514 	case athr_l1c:
515 	case athr_l1d:
516 	case athr_l1d_2:
517 		netdev->max_mtu = MAX_JUMBO_FRAME_SIZE -
518 				  (ETH_HLEN + ETH_FCS_LEN + VLAN_HLEN);
519 		break;
520 	/* The 10/100 devices don't support jumbo packets, max_mtu 1500 */
521 	default:
522 		netdev->max_mtu = ETH_DATA_LEN;
523 		break;
524 	}
525 }
526 
527 /**
528  * atl1c_change_mtu - Change the Maximum Transfer Unit
529  * @netdev: network interface device structure
530  * @new_mtu: new value for maximum frame size
531  *
532  * Returns 0 on success, negative on failure
533  */
534 static int atl1c_change_mtu(struct net_device *netdev, int new_mtu)
535 {
536 	struct atl1c_adapter *adapter = netdev_priv(netdev);
537 
538 	/* set MTU */
539 	if (netif_running(netdev)) {
540 		while (test_and_set_bit(__AT_RESETTING, &adapter->flags))
541 			msleep(1);
542 		netdev->mtu = new_mtu;
543 		adapter->hw.max_frame_size = new_mtu;
544 		atl1c_set_rxbufsize(adapter, netdev);
545 		atl1c_down(adapter);
546 		netdev_update_features(netdev);
547 		atl1c_up(adapter);
548 		clear_bit(__AT_RESETTING, &adapter->flags);
549 	}
550 	return 0;
551 }
552 
553 /*
554  *  caller should hold mdio_lock
555  */
556 static int atl1c_mdio_read(struct net_device *netdev, int phy_id, int reg_num)
557 {
558 	struct atl1c_adapter *adapter = netdev_priv(netdev);
559 	u16 result;
560 
561 	atl1c_read_phy_reg(&adapter->hw, reg_num, &result);
562 	return result;
563 }
564 
565 static void atl1c_mdio_write(struct net_device *netdev, int phy_id,
566 			     int reg_num, int val)
567 {
568 	struct atl1c_adapter *adapter = netdev_priv(netdev);
569 
570 	atl1c_write_phy_reg(&adapter->hw, reg_num, val);
571 }
572 
573 static int atl1c_mii_ioctl(struct net_device *netdev,
574 			   struct ifreq *ifr, int cmd)
575 {
576 	struct atl1c_adapter *adapter = netdev_priv(netdev);
577 	struct pci_dev *pdev = adapter->pdev;
578 	struct mii_ioctl_data *data = if_mii(ifr);
579 	unsigned long flags;
580 	int retval = 0;
581 
582 	if (!netif_running(netdev))
583 		return -EINVAL;
584 
585 	spin_lock_irqsave(&adapter->mdio_lock, flags);
586 	switch (cmd) {
587 	case SIOCGMIIPHY:
588 		data->phy_id = 0;
589 		break;
590 
591 	case SIOCGMIIREG:
592 		if (atl1c_read_phy_reg(&adapter->hw, data->reg_num & 0x1F,
593 				    &data->val_out)) {
594 			retval = -EIO;
595 			goto out;
596 		}
597 		break;
598 
599 	case SIOCSMIIREG:
600 		if (data->reg_num & ~(0x1F)) {
601 			retval = -EFAULT;
602 			goto out;
603 		}
604 
605 		dev_dbg(&pdev->dev, "<atl1c_mii_ioctl> write %x %x",
606 				data->reg_num, data->val_in);
607 		if (atl1c_write_phy_reg(&adapter->hw,
608 				     data->reg_num, data->val_in)) {
609 			retval = -EIO;
610 			goto out;
611 		}
612 		break;
613 
614 	default:
615 		retval = -EOPNOTSUPP;
616 		break;
617 	}
618 out:
619 	spin_unlock_irqrestore(&adapter->mdio_lock, flags);
620 	return retval;
621 }
622 
623 static int atl1c_ioctl(struct net_device *netdev, struct ifreq *ifr, int cmd)
624 {
625 	switch (cmd) {
626 	case SIOCGMIIPHY:
627 	case SIOCGMIIREG:
628 	case SIOCSMIIREG:
629 		return atl1c_mii_ioctl(netdev, ifr, cmd);
630 	default:
631 		return -EOPNOTSUPP;
632 	}
633 }
634 
635 /**
636  * atl1c_alloc_queues - Allocate memory for all rings
637  * @adapter: board private structure to initialize
638  *
639  */
640 static int atl1c_alloc_queues(struct atl1c_adapter *adapter)
641 {
642 	return 0;
643 }
644 
645 static void atl1c_set_mac_type(struct atl1c_hw *hw)
646 {
647 	switch (hw->device_id) {
648 	case PCI_DEVICE_ID_ATTANSIC_L2C:
649 		hw->nic_type = athr_l2c;
650 		break;
651 	case PCI_DEVICE_ID_ATTANSIC_L1C:
652 		hw->nic_type = athr_l1c;
653 		break;
654 	case PCI_DEVICE_ID_ATHEROS_L2C_B:
655 		hw->nic_type = athr_l2c_b;
656 		break;
657 	case PCI_DEVICE_ID_ATHEROS_L2C_B2:
658 		hw->nic_type = athr_l2c_b2;
659 		break;
660 	case PCI_DEVICE_ID_ATHEROS_L1D:
661 		hw->nic_type = athr_l1d;
662 		break;
663 	case PCI_DEVICE_ID_ATHEROS_L1D_2_0:
664 		hw->nic_type = athr_l1d_2;
665 		break;
666 	default:
667 		break;
668 	}
669 }
670 
671 static int atl1c_setup_mac_funcs(struct atl1c_hw *hw)
672 {
673 	u32 link_ctrl_data;
674 
675 	atl1c_set_mac_type(hw);
676 	AT_READ_REG(hw, REG_LINK_CTRL, &link_ctrl_data);
677 
678 	hw->ctrl_flags = ATL1C_INTR_MODRT_ENABLE  |
679 			 ATL1C_TXQ_MODE_ENHANCE;
680 	hw->ctrl_flags |= ATL1C_ASPM_L0S_SUPPORT |
681 			  ATL1C_ASPM_L1_SUPPORT;
682 	hw->ctrl_flags |= ATL1C_ASPM_CTRL_MON;
683 
684 	if (hw->nic_type == athr_l1c ||
685 	    hw->nic_type == athr_l1d ||
686 	    hw->nic_type == athr_l1d_2)
687 		hw->link_cap_flags |= ATL1C_LINK_CAP_1000M;
688 	return 0;
689 }
690 
691 struct atl1c_platform_patch {
692 	u16 pci_did;
693 	u8  pci_revid;
694 	u16 subsystem_vid;
695 	u16 subsystem_did;
696 	u32 patch_flag;
697 #define ATL1C_LINK_PATCH	0x1
698 };
699 static const struct atl1c_platform_patch plats[] = {
700 {0x2060, 0xC1, 0x1019, 0x8152, 0x1},
701 {0x2060, 0xC1, 0x1019, 0x2060, 0x1},
702 {0x2060, 0xC1, 0x1019, 0xE000, 0x1},
703 {0x2062, 0xC0, 0x1019, 0x8152, 0x1},
704 {0x2062, 0xC0, 0x1019, 0x2062, 0x1},
705 {0x2062, 0xC0, 0x1458, 0xE000, 0x1},
706 {0x2062, 0xC1, 0x1019, 0x8152, 0x1},
707 {0x2062, 0xC1, 0x1019, 0x2062, 0x1},
708 {0x2062, 0xC1, 0x1458, 0xE000, 0x1},
709 {0x2062, 0xC1, 0x1565, 0x2802, 0x1},
710 {0x2062, 0xC1, 0x1565, 0x2801, 0x1},
711 {0x1073, 0xC0, 0x1019, 0x8151, 0x1},
712 {0x1073, 0xC0, 0x1019, 0x1073, 0x1},
713 {0x1073, 0xC0, 0x1458, 0xE000, 0x1},
714 {0x1083, 0xC0, 0x1458, 0xE000, 0x1},
715 {0x1083, 0xC0, 0x1019, 0x8151, 0x1},
716 {0x1083, 0xC0, 0x1019, 0x1083, 0x1},
717 {0x1083, 0xC0, 0x1462, 0x7680, 0x1},
718 {0x1083, 0xC0, 0x1565, 0x2803, 0x1},
719 {0},
720 };
721 
722 static void atl1c_patch_assign(struct atl1c_hw *hw)
723 {
724 	struct pci_dev	*pdev = hw->adapter->pdev;
725 	u32 misc_ctrl;
726 	int i = 0;
727 
728 	hw->msi_lnkpatch = false;
729 
730 	while (plats[i].pci_did != 0) {
731 		if (plats[i].pci_did == hw->device_id &&
732 		    plats[i].pci_revid == hw->revision_id &&
733 		    plats[i].subsystem_vid == hw->subsystem_vendor_id &&
734 		    plats[i].subsystem_did == hw->subsystem_id) {
735 			if (plats[i].patch_flag & ATL1C_LINK_PATCH)
736 				hw->msi_lnkpatch = true;
737 		}
738 		i++;
739 	}
740 
741 	if (hw->device_id == PCI_DEVICE_ID_ATHEROS_L2C_B2 &&
742 	    hw->revision_id == L2CB_V21) {
743 		/* config access mode */
744 		pci_write_config_dword(pdev, REG_PCIE_IND_ACC_ADDR,
745 				       REG_PCIE_DEV_MISC_CTRL);
746 		pci_read_config_dword(pdev, REG_PCIE_IND_ACC_DATA, &misc_ctrl);
747 		misc_ctrl &= ~0x100;
748 		pci_write_config_dword(pdev, REG_PCIE_IND_ACC_ADDR,
749 				       REG_PCIE_DEV_MISC_CTRL);
750 		pci_write_config_dword(pdev, REG_PCIE_IND_ACC_DATA, misc_ctrl);
751 	}
752 }
753 /**
754  * atl1c_sw_init - Initialize general software structures (struct atl1c_adapter)
755  * @adapter: board private structure to initialize
756  *
757  * atl1c_sw_init initializes the Adapter private data structure.
758  * Fields are initialized based on PCI device information and
759  * OS network device settings (MTU size).
760  */
761 static int atl1c_sw_init(struct atl1c_adapter *adapter)
762 {
763 	struct atl1c_hw *hw   = &adapter->hw;
764 	struct pci_dev	*pdev = adapter->pdev;
765 	u32 revision;
766 
767 
768 	adapter->wol = 0;
769 	device_set_wakeup_enable(&pdev->dev, false);
770 	adapter->link_speed = SPEED_0;
771 	adapter->link_duplex = FULL_DUPLEX;
772 	adapter->tpd_ring[0].count = 1024;
773 	adapter->rfd_ring.count = 512;
774 
775 	hw->vendor_id = pdev->vendor;
776 	hw->device_id = pdev->device;
777 	hw->subsystem_vendor_id = pdev->subsystem_vendor;
778 	hw->subsystem_id = pdev->subsystem_device;
779 	pci_read_config_dword(pdev, PCI_CLASS_REVISION, &revision);
780 	hw->revision_id = revision & 0xFF;
781 	/* before link up, we assume hibernate is true */
782 	hw->hibernate = true;
783 	hw->media_type = MEDIA_TYPE_AUTO_SENSOR;
784 	if (atl1c_setup_mac_funcs(hw) != 0) {
785 		dev_err(&pdev->dev, "set mac function pointers failed\n");
786 		return -1;
787 	}
788 	atl1c_patch_assign(hw);
789 
790 	hw->intr_mask = IMR_NORMAL_MASK;
791 	hw->phy_configured = false;
792 	hw->preamble_len = 7;
793 	hw->max_frame_size = adapter->netdev->mtu;
794 	hw->autoneg_advertised = ADVERTISED_Autoneg;
795 	hw->indirect_tab = 0xE4E4E4E4;
796 	hw->base_cpu = 0;
797 
798 	hw->ict = 50000;		/* 100ms */
799 	hw->smb_timer = 200000;	  	/* 400ms */
800 	hw->rx_imt = 200;
801 	hw->tx_imt = 1000;
802 
803 	hw->tpd_burst = 5;
804 	hw->rfd_burst = 8;
805 	hw->dma_order = atl1c_dma_ord_out;
806 	hw->dmar_block = atl1c_dma_req_1024;
807 
808 	if (atl1c_alloc_queues(adapter)) {
809 		dev_err(&pdev->dev, "Unable to allocate memory for queues\n");
810 		return -ENOMEM;
811 	}
812 	/* TODO */
813 	atl1c_set_rxbufsize(adapter, adapter->netdev);
814 	atomic_set(&adapter->irq_sem, 1);
815 	spin_lock_init(&adapter->mdio_lock);
816 	set_bit(__AT_DOWN, &adapter->flags);
817 
818 	return 0;
819 }
820 
821 static inline void atl1c_clean_buffer(struct pci_dev *pdev,
822 				struct atl1c_buffer *buffer_info)
823 {
824 	u16 pci_driection;
825 	if (buffer_info->flags & ATL1C_BUFFER_FREE)
826 		return;
827 	if (buffer_info->dma) {
828 		if (buffer_info->flags & ATL1C_PCIMAP_FROMDEVICE)
829 			pci_driection = PCI_DMA_FROMDEVICE;
830 		else
831 			pci_driection = PCI_DMA_TODEVICE;
832 
833 		if (buffer_info->flags & ATL1C_PCIMAP_SINGLE)
834 			pci_unmap_single(pdev, buffer_info->dma,
835 					buffer_info->length, pci_driection);
836 		else if (buffer_info->flags & ATL1C_PCIMAP_PAGE)
837 			pci_unmap_page(pdev, buffer_info->dma,
838 					buffer_info->length, pci_driection);
839 	}
840 	if (buffer_info->skb)
841 		dev_consume_skb_any(buffer_info->skb);
842 	buffer_info->dma = 0;
843 	buffer_info->skb = NULL;
844 	ATL1C_SET_BUFFER_STATE(buffer_info, ATL1C_BUFFER_FREE);
845 }
846 /**
847  * atl1c_clean_tx_ring - Free Tx-skb
848  * @adapter: board private structure
849  */
850 static void atl1c_clean_tx_ring(struct atl1c_adapter *adapter,
851 				enum atl1c_trans_queue type)
852 {
853 	struct atl1c_tpd_ring *tpd_ring = &adapter->tpd_ring[type];
854 	struct atl1c_buffer *buffer_info;
855 	struct pci_dev *pdev = adapter->pdev;
856 	u16 index, ring_count;
857 
858 	ring_count = tpd_ring->count;
859 	for (index = 0; index < ring_count; index++) {
860 		buffer_info = &tpd_ring->buffer_info[index];
861 		atl1c_clean_buffer(pdev, buffer_info);
862 	}
863 
864 	netdev_reset_queue(adapter->netdev);
865 
866 	/* Zero out Tx-buffers */
867 	memset(tpd_ring->desc, 0, sizeof(struct atl1c_tpd_desc) *
868 		ring_count);
869 	atomic_set(&tpd_ring->next_to_clean, 0);
870 	tpd_ring->next_to_use = 0;
871 }
872 
873 /**
874  * atl1c_clean_rx_ring - Free rx-reservation skbs
875  * @adapter: board private structure
876  */
877 static void atl1c_clean_rx_ring(struct atl1c_adapter *adapter)
878 {
879 	struct atl1c_rfd_ring *rfd_ring = &adapter->rfd_ring;
880 	struct atl1c_rrd_ring *rrd_ring = &adapter->rrd_ring;
881 	struct atl1c_buffer *buffer_info;
882 	struct pci_dev *pdev = adapter->pdev;
883 	int j;
884 
885 	for (j = 0; j < rfd_ring->count; j++) {
886 		buffer_info = &rfd_ring->buffer_info[j];
887 		atl1c_clean_buffer(pdev, buffer_info);
888 	}
889 	/* zero out the descriptor ring */
890 	memset(rfd_ring->desc, 0, rfd_ring->size);
891 	rfd_ring->next_to_clean = 0;
892 	rfd_ring->next_to_use = 0;
893 	rrd_ring->next_to_use = 0;
894 	rrd_ring->next_to_clean = 0;
895 }
896 
897 /*
898  * Read / Write Ptr Initialize:
899  */
900 static void atl1c_init_ring_ptrs(struct atl1c_adapter *adapter)
901 {
902 	struct atl1c_tpd_ring *tpd_ring = adapter->tpd_ring;
903 	struct atl1c_rfd_ring *rfd_ring = &adapter->rfd_ring;
904 	struct atl1c_rrd_ring *rrd_ring = &adapter->rrd_ring;
905 	struct atl1c_buffer *buffer_info;
906 	int i, j;
907 
908 	for (i = 0; i < AT_MAX_TRANSMIT_QUEUE; i++) {
909 		tpd_ring[i].next_to_use = 0;
910 		atomic_set(&tpd_ring[i].next_to_clean, 0);
911 		buffer_info = tpd_ring[i].buffer_info;
912 		for (j = 0; j < tpd_ring->count; j++)
913 			ATL1C_SET_BUFFER_STATE(&buffer_info[i],
914 					ATL1C_BUFFER_FREE);
915 	}
916 	rfd_ring->next_to_use = 0;
917 	rfd_ring->next_to_clean = 0;
918 	rrd_ring->next_to_use = 0;
919 	rrd_ring->next_to_clean = 0;
920 	for (j = 0; j < rfd_ring->count; j++) {
921 		buffer_info = &rfd_ring->buffer_info[j];
922 		ATL1C_SET_BUFFER_STATE(buffer_info, ATL1C_BUFFER_FREE);
923 	}
924 }
925 
926 /**
927  * atl1c_free_ring_resources - Free Tx / RX descriptor Resources
928  * @adapter: board private structure
929  *
930  * Free all transmit software resources
931  */
932 static void atl1c_free_ring_resources(struct atl1c_adapter *adapter)
933 {
934 	struct pci_dev *pdev = adapter->pdev;
935 
936 	pci_free_consistent(pdev, adapter->ring_header.size,
937 					adapter->ring_header.desc,
938 					adapter->ring_header.dma);
939 	adapter->ring_header.desc = NULL;
940 
941 	/* Note: just free tdp_ring.buffer_info,
942 	*  it contain rfd_ring.buffer_info, do not double free */
943 	if (adapter->tpd_ring[0].buffer_info) {
944 		kfree(adapter->tpd_ring[0].buffer_info);
945 		adapter->tpd_ring[0].buffer_info = NULL;
946 	}
947 	if (adapter->rx_page) {
948 		put_page(adapter->rx_page);
949 		adapter->rx_page = NULL;
950 	}
951 }
952 
953 /**
954  * atl1c_setup_mem_resources - allocate Tx / RX descriptor resources
955  * @adapter: board private structure
956  *
957  * Return 0 on success, negative on failure
958  */
959 static int atl1c_setup_ring_resources(struct atl1c_adapter *adapter)
960 {
961 	struct pci_dev *pdev = adapter->pdev;
962 	struct atl1c_tpd_ring *tpd_ring = adapter->tpd_ring;
963 	struct atl1c_rfd_ring *rfd_ring = &adapter->rfd_ring;
964 	struct atl1c_rrd_ring *rrd_ring = &adapter->rrd_ring;
965 	struct atl1c_ring_header *ring_header = &adapter->ring_header;
966 	int size;
967 	int i;
968 	int count = 0;
969 	int rx_desc_count = 0;
970 	u32 offset = 0;
971 
972 	rrd_ring->count = rfd_ring->count;
973 	for (i = 1; i < AT_MAX_TRANSMIT_QUEUE; i++)
974 		tpd_ring[i].count = tpd_ring[0].count;
975 
976 	/* 2 tpd queue, one high priority queue,
977 	 * another normal priority queue */
978 	size = sizeof(struct atl1c_buffer) * (tpd_ring->count * 2 +
979 		rfd_ring->count);
980 	tpd_ring->buffer_info = kzalloc(size, GFP_KERNEL);
981 	if (unlikely(!tpd_ring->buffer_info))
982 		goto err_nomem;
983 
984 	for (i = 0; i < AT_MAX_TRANSMIT_QUEUE; i++) {
985 		tpd_ring[i].buffer_info =
986 			(tpd_ring->buffer_info + count);
987 		count += tpd_ring[i].count;
988 	}
989 
990 	rfd_ring->buffer_info =
991 		(tpd_ring->buffer_info + count);
992 	count += rfd_ring->count;
993 	rx_desc_count += rfd_ring->count;
994 
995 	/*
996 	 * real ring DMA buffer
997 	 * each ring/block may need up to 8 bytes for alignment, hence the
998 	 * additional bytes tacked onto the end.
999 	 */
1000 	ring_header->size = size =
1001 		sizeof(struct atl1c_tpd_desc) * tpd_ring->count * 2 +
1002 		sizeof(struct atl1c_rx_free_desc) * rx_desc_count +
1003 		sizeof(struct atl1c_recv_ret_status) * rx_desc_count +
1004 		8 * 4;
1005 
1006 	ring_header->desc = dma_alloc_coherent(&pdev->dev, ring_header->size,
1007 					       &ring_header->dma, GFP_KERNEL);
1008 	if (unlikely(!ring_header->desc)) {
1009 		dev_err(&pdev->dev, "could not get memory for DMA buffer\n");
1010 		goto err_nomem;
1011 	}
1012 	/* init TPD ring */
1013 
1014 	tpd_ring[0].dma = roundup(ring_header->dma, 8);
1015 	offset = tpd_ring[0].dma - ring_header->dma;
1016 	for (i = 0; i < AT_MAX_TRANSMIT_QUEUE; i++) {
1017 		tpd_ring[i].dma = ring_header->dma + offset;
1018 		tpd_ring[i].desc = (u8 *) ring_header->desc + offset;
1019 		tpd_ring[i].size =
1020 			sizeof(struct atl1c_tpd_desc) * tpd_ring[i].count;
1021 		offset += roundup(tpd_ring[i].size, 8);
1022 	}
1023 	/* init RFD ring */
1024 	rfd_ring->dma = ring_header->dma + offset;
1025 	rfd_ring->desc = (u8 *) ring_header->desc + offset;
1026 	rfd_ring->size = sizeof(struct atl1c_rx_free_desc) * rfd_ring->count;
1027 	offset += roundup(rfd_ring->size, 8);
1028 
1029 	/* init RRD ring */
1030 	rrd_ring->dma = ring_header->dma + offset;
1031 	rrd_ring->desc = (u8 *) ring_header->desc + offset;
1032 	rrd_ring->size = sizeof(struct atl1c_recv_ret_status) *
1033 		rrd_ring->count;
1034 	offset += roundup(rrd_ring->size, 8);
1035 
1036 	return 0;
1037 
1038 err_nomem:
1039 	kfree(tpd_ring->buffer_info);
1040 	return -ENOMEM;
1041 }
1042 
1043 static void atl1c_configure_des_ring(struct atl1c_adapter *adapter)
1044 {
1045 	struct atl1c_hw *hw = &adapter->hw;
1046 	struct atl1c_rfd_ring *rfd_ring = &adapter->rfd_ring;
1047 	struct atl1c_rrd_ring *rrd_ring = &adapter->rrd_ring;
1048 	struct atl1c_tpd_ring *tpd_ring = (struct atl1c_tpd_ring *)
1049 				adapter->tpd_ring;
1050 
1051 	/* TPD */
1052 	AT_WRITE_REG(hw, REG_TX_BASE_ADDR_HI,
1053 			(u32)((tpd_ring[atl1c_trans_normal].dma &
1054 				AT_DMA_HI_ADDR_MASK) >> 32));
1055 	/* just enable normal priority TX queue */
1056 	AT_WRITE_REG(hw, REG_TPD_PRI0_ADDR_LO,
1057 			(u32)(tpd_ring[atl1c_trans_normal].dma &
1058 				AT_DMA_LO_ADDR_MASK));
1059 	AT_WRITE_REG(hw, REG_TPD_PRI1_ADDR_LO,
1060 			(u32)(tpd_ring[atl1c_trans_high].dma &
1061 				AT_DMA_LO_ADDR_MASK));
1062 	AT_WRITE_REG(hw, REG_TPD_RING_SIZE,
1063 			(u32)(tpd_ring[0].count & TPD_RING_SIZE_MASK));
1064 
1065 
1066 	/* RFD */
1067 	AT_WRITE_REG(hw, REG_RX_BASE_ADDR_HI,
1068 			(u32)((rfd_ring->dma & AT_DMA_HI_ADDR_MASK) >> 32));
1069 	AT_WRITE_REG(hw, REG_RFD0_HEAD_ADDR_LO,
1070 			(u32)(rfd_ring->dma & AT_DMA_LO_ADDR_MASK));
1071 
1072 	AT_WRITE_REG(hw, REG_RFD_RING_SIZE,
1073 			rfd_ring->count & RFD_RING_SIZE_MASK);
1074 	AT_WRITE_REG(hw, REG_RX_BUF_SIZE,
1075 			adapter->rx_buffer_len & RX_BUF_SIZE_MASK);
1076 
1077 	/* RRD */
1078 	AT_WRITE_REG(hw, REG_RRD0_HEAD_ADDR_LO,
1079 			(u32)(rrd_ring->dma & AT_DMA_LO_ADDR_MASK));
1080 	AT_WRITE_REG(hw, REG_RRD_RING_SIZE,
1081 			(rrd_ring->count & RRD_RING_SIZE_MASK));
1082 
1083 	if (hw->nic_type == athr_l2c_b) {
1084 		AT_WRITE_REG(hw, REG_SRAM_RXF_LEN, 0x02a0L);
1085 		AT_WRITE_REG(hw, REG_SRAM_TXF_LEN, 0x0100L);
1086 		AT_WRITE_REG(hw, REG_SRAM_RXF_ADDR, 0x029f0000L);
1087 		AT_WRITE_REG(hw, REG_SRAM_RFD0_INFO, 0x02bf02a0L);
1088 		AT_WRITE_REG(hw, REG_SRAM_TXF_ADDR, 0x03bf02c0L);
1089 		AT_WRITE_REG(hw, REG_SRAM_TRD_ADDR, 0x03df03c0L);
1090 		AT_WRITE_REG(hw, REG_TXF_WATER_MARK, 0);	/* TX watermark, to enter l1 state.*/
1091 		AT_WRITE_REG(hw, REG_RXD_DMA_CTRL, 0);		/* RXD threshold.*/
1092 	}
1093 	/* Load all of base address above */
1094 	AT_WRITE_REG(hw, REG_LOAD_PTR, 1);
1095 }
1096 
1097 static void atl1c_configure_tx(struct atl1c_adapter *adapter)
1098 {
1099 	struct atl1c_hw *hw = &adapter->hw;
1100 	int max_pay_load;
1101 	u16 tx_offload_thresh;
1102 	u32 txq_ctrl_data;
1103 
1104 	tx_offload_thresh = MAX_TSO_FRAME_SIZE;
1105 	AT_WRITE_REG(hw, REG_TX_TSO_OFFLOAD_THRESH,
1106 		(tx_offload_thresh >> 3) & TX_TSO_OFFLOAD_THRESH_MASK);
1107 	max_pay_load = pcie_get_readrq(adapter->pdev) >> 8;
1108 	hw->dmar_block = min_t(u32, max_pay_load, hw->dmar_block);
1109 	/*
1110 	 * if BIOS had changed the dam-read-max-length to an invalid value,
1111 	 * restore it to default value
1112 	 */
1113 	if (hw->dmar_block < DEVICE_CTRL_MAXRRS_MIN) {
1114 		pcie_set_readrq(adapter->pdev, 128 << DEVICE_CTRL_MAXRRS_MIN);
1115 		hw->dmar_block = DEVICE_CTRL_MAXRRS_MIN;
1116 	}
1117 	txq_ctrl_data =
1118 		hw->nic_type == athr_l2c_b || hw->nic_type == athr_l2c_b2 ?
1119 		L2CB_TXQ_CFGV : L1C_TXQ_CFGV;
1120 
1121 	AT_WRITE_REG(hw, REG_TXQ_CTRL, txq_ctrl_data);
1122 }
1123 
1124 static void atl1c_configure_rx(struct atl1c_adapter *adapter)
1125 {
1126 	struct atl1c_hw *hw = &adapter->hw;
1127 	u32 rxq_ctrl_data;
1128 
1129 	rxq_ctrl_data = (hw->rfd_burst & RXQ_RFD_BURST_NUM_MASK) <<
1130 			RXQ_RFD_BURST_NUM_SHIFT;
1131 
1132 	if (hw->ctrl_flags & ATL1C_RX_IPV6_CHKSUM)
1133 		rxq_ctrl_data |= IPV6_CHKSUM_CTRL_EN;
1134 
1135 	/* aspm for gigabit */
1136 	if (hw->nic_type != athr_l1d_2 && (hw->device_id & 1) != 0)
1137 		rxq_ctrl_data = FIELD_SETX(rxq_ctrl_data, ASPM_THRUPUT_LIMIT,
1138 			ASPM_THRUPUT_LIMIT_100M);
1139 
1140 	AT_WRITE_REG(hw, REG_RXQ_CTRL, rxq_ctrl_data);
1141 }
1142 
1143 static void atl1c_configure_dma(struct atl1c_adapter *adapter)
1144 {
1145 	struct atl1c_hw *hw = &adapter->hw;
1146 	u32 dma_ctrl_data;
1147 
1148 	dma_ctrl_data = FIELDX(DMA_CTRL_RORDER_MODE, DMA_CTRL_RORDER_MODE_OUT) |
1149 		DMA_CTRL_RREQ_PRI_DATA |
1150 		FIELDX(DMA_CTRL_RREQ_BLEN, hw->dmar_block) |
1151 		FIELDX(DMA_CTRL_WDLY_CNT, DMA_CTRL_WDLY_CNT_DEF) |
1152 		FIELDX(DMA_CTRL_RDLY_CNT, DMA_CTRL_RDLY_CNT_DEF);
1153 
1154 	AT_WRITE_REG(hw, REG_DMA_CTRL, dma_ctrl_data);
1155 }
1156 
1157 /*
1158  * Stop the mac, transmit and receive units
1159  * hw - Struct containing variables accessed by shared code
1160  * return : 0  or  idle status (if error)
1161  */
1162 static int atl1c_stop_mac(struct atl1c_hw *hw)
1163 {
1164 	u32 data;
1165 
1166 	AT_READ_REG(hw, REG_RXQ_CTRL, &data);
1167 	data &= ~RXQ_CTRL_EN;
1168 	AT_WRITE_REG(hw, REG_RXQ_CTRL, data);
1169 
1170 	AT_READ_REG(hw, REG_TXQ_CTRL, &data);
1171 	data &= ~TXQ_CTRL_EN;
1172 	AT_WRITE_REG(hw, REG_TXQ_CTRL, data);
1173 
1174 	atl1c_wait_until_idle(hw, IDLE_STATUS_RXQ_BUSY | IDLE_STATUS_TXQ_BUSY);
1175 
1176 	AT_READ_REG(hw, REG_MAC_CTRL, &data);
1177 	data &= ~(MAC_CTRL_TX_EN | MAC_CTRL_RX_EN);
1178 	AT_WRITE_REG(hw, REG_MAC_CTRL, data);
1179 
1180 	return (int)atl1c_wait_until_idle(hw,
1181 		IDLE_STATUS_TXMAC_BUSY | IDLE_STATUS_RXMAC_BUSY);
1182 }
1183 
1184 static void atl1c_start_mac(struct atl1c_adapter *adapter)
1185 {
1186 	struct atl1c_hw *hw = &adapter->hw;
1187 	u32 mac, txq, rxq;
1188 
1189 	hw->mac_duplex = adapter->link_duplex == FULL_DUPLEX;
1190 	hw->mac_speed = adapter->link_speed == SPEED_1000 ?
1191 		atl1c_mac_speed_1000 : atl1c_mac_speed_10_100;
1192 
1193 	AT_READ_REG(hw, REG_TXQ_CTRL, &txq);
1194 	AT_READ_REG(hw, REG_RXQ_CTRL, &rxq);
1195 	AT_READ_REG(hw, REG_MAC_CTRL, &mac);
1196 
1197 	txq |= TXQ_CTRL_EN;
1198 	rxq |= RXQ_CTRL_EN;
1199 	mac |= MAC_CTRL_TX_EN | MAC_CTRL_TX_FLOW |
1200 	       MAC_CTRL_RX_EN | MAC_CTRL_RX_FLOW |
1201 	       MAC_CTRL_ADD_CRC | MAC_CTRL_PAD |
1202 	       MAC_CTRL_BC_EN | MAC_CTRL_SINGLE_PAUSE_EN |
1203 	       MAC_CTRL_HASH_ALG_CRC32;
1204 	if (hw->mac_duplex)
1205 		mac |= MAC_CTRL_DUPLX;
1206 	else
1207 		mac &= ~MAC_CTRL_DUPLX;
1208 	mac = FIELD_SETX(mac, MAC_CTRL_SPEED, hw->mac_speed);
1209 	mac = FIELD_SETX(mac, MAC_CTRL_PRMLEN, hw->preamble_len);
1210 
1211 	AT_WRITE_REG(hw, REG_TXQ_CTRL, txq);
1212 	AT_WRITE_REG(hw, REG_RXQ_CTRL, rxq);
1213 	AT_WRITE_REG(hw, REG_MAC_CTRL, mac);
1214 }
1215 
1216 /*
1217  * Reset the transmit and receive units; mask and clear all interrupts.
1218  * hw - Struct containing variables accessed by shared code
1219  * return : 0  or  idle status (if error)
1220  */
1221 static int atl1c_reset_mac(struct atl1c_hw *hw)
1222 {
1223 	struct atl1c_adapter *adapter = hw->adapter;
1224 	struct pci_dev *pdev = adapter->pdev;
1225 	u32 ctrl_data = 0;
1226 
1227 	atl1c_stop_mac(hw);
1228 	/*
1229 	 * Issue Soft Reset to the MAC.  This will reset the chip's
1230 	 * transmit, receive, DMA.  It will not effect
1231 	 * the current PCI configuration.  The global reset bit is self-
1232 	 * clearing, and should clear within a microsecond.
1233 	 */
1234 	AT_READ_REG(hw, REG_MASTER_CTRL, &ctrl_data);
1235 	ctrl_data |= MASTER_CTRL_OOB_DIS;
1236 	AT_WRITE_REG(hw, REG_MASTER_CTRL, ctrl_data | MASTER_CTRL_SOFT_RST);
1237 
1238 	AT_WRITE_FLUSH(hw);
1239 	msleep(10);
1240 	/* Wait at least 10ms for All module to be Idle */
1241 
1242 	if (atl1c_wait_until_idle(hw, IDLE_STATUS_MASK)) {
1243 		dev_err(&pdev->dev,
1244 			"MAC state machine can't be idle since"
1245 			" disabled for 10ms second\n");
1246 		return -1;
1247 	}
1248 	AT_WRITE_REG(hw, REG_MASTER_CTRL, ctrl_data);
1249 
1250 	/* driver control speed/duplex */
1251 	AT_READ_REG(hw, REG_MAC_CTRL, &ctrl_data);
1252 	AT_WRITE_REG(hw, REG_MAC_CTRL, ctrl_data | MAC_CTRL_SPEED_MODE_SW);
1253 
1254 	/* clk switch setting */
1255 	AT_READ_REG(hw, REG_SERDES, &ctrl_data);
1256 	switch (hw->nic_type) {
1257 	case athr_l2c_b:
1258 		ctrl_data &= ~(SERDES_PHY_CLK_SLOWDOWN |
1259 				SERDES_MAC_CLK_SLOWDOWN);
1260 		AT_WRITE_REG(hw, REG_SERDES, ctrl_data);
1261 		break;
1262 	case athr_l2c_b2:
1263 	case athr_l1d_2:
1264 		ctrl_data |= SERDES_PHY_CLK_SLOWDOWN | SERDES_MAC_CLK_SLOWDOWN;
1265 		AT_WRITE_REG(hw, REG_SERDES, ctrl_data);
1266 		break;
1267 	default:
1268 		break;
1269 	}
1270 
1271 	return 0;
1272 }
1273 
1274 static void atl1c_disable_l0s_l1(struct atl1c_hw *hw)
1275 {
1276 	u16 ctrl_flags = hw->ctrl_flags;
1277 
1278 	hw->ctrl_flags &= ~(ATL1C_ASPM_L0S_SUPPORT | ATL1C_ASPM_L1_SUPPORT);
1279 	atl1c_set_aspm(hw, SPEED_0);
1280 	hw->ctrl_flags = ctrl_flags;
1281 }
1282 
1283 /*
1284  * Set ASPM state.
1285  * Enable/disable L0s/L1 depend on link state.
1286  */
1287 static void atl1c_set_aspm(struct atl1c_hw *hw, u16 link_speed)
1288 {
1289 	u32 pm_ctrl_data;
1290 	u32 link_l1_timer;
1291 
1292 	AT_READ_REG(hw, REG_PM_CTRL, &pm_ctrl_data);
1293 	pm_ctrl_data &= ~(PM_CTRL_ASPM_L1_EN |
1294 			  PM_CTRL_ASPM_L0S_EN |
1295 			  PM_CTRL_MAC_ASPM_CHK);
1296 	/* L1 timer */
1297 	if (hw->nic_type == athr_l2c_b2 || hw->nic_type == athr_l1d_2) {
1298 		pm_ctrl_data &= ~PMCTRL_TXL1_AFTER_L0S;
1299 		link_l1_timer =
1300 			link_speed == SPEED_1000 || link_speed == SPEED_100 ?
1301 			L1D_PMCTRL_L1_ENTRY_TM_16US : 1;
1302 		pm_ctrl_data = FIELD_SETX(pm_ctrl_data,
1303 			L1D_PMCTRL_L1_ENTRY_TM, link_l1_timer);
1304 	} else {
1305 		link_l1_timer = hw->nic_type == athr_l2c_b ?
1306 			L2CB1_PM_CTRL_L1_ENTRY_TM : L1C_PM_CTRL_L1_ENTRY_TM;
1307 		if (link_speed != SPEED_1000 && link_speed != SPEED_100)
1308 			link_l1_timer = 1;
1309 		pm_ctrl_data = FIELD_SETX(pm_ctrl_data,
1310 			PM_CTRL_L1_ENTRY_TIMER, link_l1_timer);
1311 	}
1312 
1313 	/* L0S/L1 enable */
1314 	if ((hw->ctrl_flags & ATL1C_ASPM_L0S_SUPPORT) && link_speed != SPEED_0)
1315 		pm_ctrl_data |= PM_CTRL_ASPM_L0S_EN | PM_CTRL_MAC_ASPM_CHK;
1316 	if (hw->ctrl_flags & ATL1C_ASPM_L1_SUPPORT)
1317 		pm_ctrl_data |= PM_CTRL_ASPM_L1_EN | PM_CTRL_MAC_ASPM_CHK;
1318 
1319 	/* l2cb & l1d & l2cb2 & l1d2 */
1320 	if (hw->nic_type == athr_l2c_b || hw->nic_type == athr_l1d ||
1321 	    hw->nic_type == athr_l2c_b2 || hw->nic_type == athr_l1d_2) {
1322 		pm_ctrl_data = FIELD_SETX(pm_ctrl_data,
1323 			PM_CTRL_PM_REQ_TIMER, PM_CTRL_PM_REQ_TO_DEF);
1324 		pm_ctrl_data |= PM_CTRL_RCVR_WT_TIMER |
1325 				PM_CTRL_SERDES_PD_EX_L1 |
1326 				PM_CTRL_CLK_SWH_L1;
1327 		pm_ctrl_data &= ~(PM_CTRL_SERDES_L1_EN |
1328 				  PM_CTRL_SERDES_PLL_L1_EN |
1329 				  PM_CTRL_SERDES_BUFS_RX_L1_EN |
1330 				  PM_CTRL_SA_DLY_EN |
1331 				  PM_CTRL_HOTRST);
1332 		/* disable l0s if link down or l2cb */
1333 		if (link_speed == SPEED_0 || hw->nic_type == athr_l2c_b)
1334 			pm_ctrl_data &= ~PM_CTRL_ASPM_L0S_EN;
1335 	} else { /* l1c */
1336 		pm_ctrl_data =
1337 			FIELD_SETX(pm_ctrl_data, PM_CTRL_L1_ENTRY_TIMER, 0);
1338 		if (link_speed != SPEED_0) {
1339 			pm_ctrl_data |= PM_CTRL_SERDES_L1_EN |
1340 					PM_CTRL_SERDES_PLL_L1_EN |
1341 					PM_CTRL_SERDES_BUFS_RX_L1_EN;
1342 			pm_ctrl_data &= ~(PM_CTRL_SERDES_PD_EX_L1 |
1343 					  PM_CTRL_CLK_SWH_L1 |
1344 					  PM_CTRL_ASPM_L0S_EN |
1345 					  PM_CTRL_ASPM_L1_EN);
1346 		} else { /* link down */
1347 			pm_ctrl_data |= PM_CTRL_CLK_SWH_L1;
1348 			pm_ctrl_data &= ~(PM_CTRL_SERDES_L1_EN |
1349 					  PM_CTRL_SERDES_PLL_L1_EN |
1350 					  PM_CTRL_SERDES_BUFS_RX_L1_EN |
1351 					  PM_CTRL_ASPM_L0S_EN);
1352 		}
1353 	}
1354 	AT_WRITE_REG(hw, REG_PM_CTRL, pm_ctrl_data);
1355 
1356 	return;
1357 }
1358 
1359 /**
1360  * atl1c_configure - Configure Transmit&Receive Unit after Reset
1361  * @adapter: board private structure
1362  *
1363  * Configure the Tx /Rx unit of the MAC after a reset.
1364  */
1365 static int atl1c_configure_mac(struct atl1c_adapter *adapter)
1366 {
1367 	struct atl1c_hw *hw = &adapter->hw;
1368 	u32 master_ctrl_data = 0;
1369 	u32 intr_modrt_data;
1370 	u32 data;
1371 
1372 	AT_READ_REG(hw, REG_MASTER_CTRL, &master_ctrl_data);
1373 	master_ctrl_data &= ~(MASTER_CTRL_TX_ITIMER_EN |
1374 			      MASTER_CTRL_RX_ITIMER_EN |
1375 			      MASTER_CTRL_INT_RDCLR);
1376 	/* clear interrupt status */
1377 	AT_WRITE_REG(hw, REG_ISR, 0xFFFFFFFF);
1378 	/*  Clear any WOL status */
1379 	AT_WRITE_REG(hw, REG_WOL_CTRL, 0);
1380 	/* set Interrupt Clear Timer
1381 	 * HW will enable self to assert interrupt event to system after
1382 	 * waiting x-time for software to notify it accept interrupt.
1383 	 */
1384 
1385 	data = CLK_GATING_EN_ALL;
1386 	if (hw->ctrl_flags & ATL1C_CLK_GATING_EN) {
1387 		if (hw->nic_type == athr_l2c_b)
1388 			data &= ~CLK_GATING_RXMAC_EN;
1389 	} else
1390 		data = 0;
1391 	AT_WRITE_REG(hw, REG_CLK_GATING_CTRL, data);
1392 
1393 	AT_WRITE_REG(hw, REG_INT_RETRIG_TIMER,
1394 		hw->ict & INT_RETRIG_TIMER_MASK);
1395 
1396 	atl1c_configure_des_ring(adapter);
1397 
1398 	if (hw->ctrl_flags & ATL1C_INTR_MODRT_ENABLE) {
1399 		intr_modrt_data = (hw->tx_imt & IRQ_MODRT_TIMER_MASK) <<
1400 					IRQ_MODRT_TX_TIMER_SHIFT;
1401 		intr_modrt_data |= (hw->rx_imt & IRQ_MODRT_TIMER_MASK) <<
1402 					IRQ_MODRT_RX_TIMER_SHIFT;
1403 		AT_WRITE_REG(hw, REG_IRQ_MODRT_TIMER_INIT, intr_modrt_data);
1404 		master_ctrl_data |=
1405 			MASTER_CTRL_TX_ITIMER_EN | MASTER_CTRL_RX_ITIMER_EN;
1406 	}
1407 
1408 	if (hw->ctrl_flags & ATL1C_INTR_CLEAR_ON_READ)
1409 		master_ctrl_data |= MASTER_CTRL_INT_RDCLR;
1410 
1411 	master_ctrl_data |= MASTER_CTRL_SA_TIMER_EN;
1412 	AT_WRITE_REG(hw, REG_MASTER_CTRL, master_ctrl_data);
1413 
1414 	AT_WRITE_REG(hw, REG_SMB_STAT_TIMER,
1415 		hw->smb_timer & SMB_STAT_TIMER_MASK);
1416 
1417 	/* set MTU */
1418 	AT_WRITE_REG(hw, REG_MTU, hw->max_frame_size + ETH_HLEN +
1419 			VLAN_HLEN + ETH_FCS_LEN);
1420 
1421 	atl1c_configure_tx(adapter);
1422 	atl1c_configure_rx(adapter);
1423 	atl1c_configure_dma(adapter);
1424 
1425 	return 0;
1426 }
1427 
1428 static int atl1c_configure(struct atl1c_adapter *adapter)
1429 {
1430 	struct net_device *netdev = adapter->netdev;
1431 	int num;
1432 
1433 	atl1c_init_ring_ptrs(adapter);
1434 	atl1c_set_multi(netdev);
1435 	atl1c_restore_vlan(adapter);
1436 
1437 	num = atl1c_alloc_rx_buffer(adapter);
1438 	if (unlikely(num == 0))
1439 		return -ENOMEM;
1440 
1441 	if (atl1c_configure_mac(adapter))
1442 		return -EIO;
1443 
1444 	return 0;
1445 }
1446 
1447 static void atl1c_update_hw_stats(struct atl1c_adapter *adapter)
1448 {
1449 	u16 hw_reg_addr = 0;
1450 	unsigned long *stats_item = NULL;
1451 	u32 data;
1452 
1453 	/* update rx status */
1454 	hw_reg_addr = REG_MAC_RX_STATUS_BIN;
1455 	stats_item  = &adapter->hw_stats.rx_ok;
1456 	while (hw_reg_addr <= REG_MAC_RX_STATUS_END) {
1457 		AT_READ_REG(&adapter->hw, hw_reg_addr, &data);
1458 		*stats_item += data;
1459 		stats_item++;
1460 		hw_reg_addr += 4;
1461 	}
1462 /* update tx status */
1463 	hw_reg_addr = REG_MAC_TX_STATUS_BIN;
1464 	stats_item  = &adapter->hw_stats.tx_ok;
1465 	while (hw_reg_addr <= REG_MAC_TX_STATUS_END) {
1466 		AT_READ_REG(&adapter->hw, hw_reg_addr, &data);
1467 		*stats_item += data;
1468 		stats_item++;
1469 		hw_reg_addr += 4;
1470 	}
1471 }
1472 
1473 /**
1474  * atl1c_get_stats - Get System Network Statistics
1475  * @netdev: network interface device structure
1476  *
1477  * Returns the address of the device statistics structure.
1478  * The statistics are actually updated from the timer callback.
1479  */
1480 static struct net_device_stats *atl1c_get_stats(struct net_device *netdev)
1481 {
1482 	struct atl1c_adapter *adapter = netdev_priv(netdev);
1483 	struct atl1c_hw_stats  *hw_stats = &adapter->hw_stats;
1484 	struct net_device_stats *net_stats = &netdev->stats;
1485 
1486 	atl1c_update_hw_stats(adapter);
1487 	net_stats->rx_bytes   = hw_stats->rx_byte_cnt;
1488 	net_stats->tx_bytes   = hw_stats->tx_byte_cnt;
1489 	net_stats->multicast  = hw_stats->rx_mcast;
1490 	net_stats->collisions = hw_stats->tx_1_col +
1491 				hw_stats->tx_2_col +
1492 				hw_stats->tx_late_col +
1493 				hw_stats->tx_abort_col;
1494 
1495 	net_stats->rx_errors  = hw_stats->rx_frag +
1496 				hw_stats->rx_fcs_err +
1497 				hw_stats->rx_len_err +
1498 				hw_stats->rx_sz_ov +
1499 				hw_stats->rx_rrd_ov +
1500 				hw_stats->rx_align_err +
1501 				hw_stats->rx_rxf_ov;
1502 
1503 	net_stats->rx_fifo_errors   = hw_stats->rx_rxf_ov;
1504 	net_stats->rx_length_errors = hw_stats->rx_len_err;
1505 	net_stats->rx_crc_errors    = hw_stats->rx_fcs_err;
1506 	net_stats->rx_frame_errors  = hw_stats->rx_align_err;
1507 	net_stats->rx_dropped       = hw_stats->rx_rrd_ov;
1508 
1509 	net_stats->tx_errors = hw_stats->tx_late_col +
1510 			       hw_stats->tx_abort_col +
1511 			       hw_stats->tx_underrun +
1512 			       hw_stats->tx_trunc;
1513 
1514 	net_stats->tx_fifo_errors    = hw_stats->tx_underrun;
1515 	net_stats->tx_aborted_errors = hw_stats->tx_abort_col;
1516 	net_stats->tx_window_errors  = hw_stats->tx_late_col;
1517 
1518 	net_stats->rx_packets = hw_stats->rx_ok + net_stats->rx_errors;
1519 	net_stats->tx_packets = hw_stats->tx_ok + net_stats->tx_errors;
1520 
1521 	return net_stats;
1522 }
1523 
1524 static inline void atl1c_clear_phy_int(struct atl1c_adapter *adapter)
1525 {
1526 	u16 phy_data;
1527 
1528 	spin_lock(&adapter->mdio_lock);
1529 	atl1c_read_phy_reg(&adapter->hw, MII_ISR, &phy_data);
1530 	spin_unlock(&adapter->mdio_lock);
1531 }
1532 
1533 static bool atl1c_clean_tx_irq(struct atl1c_adapter *adapter,
1534 				enum atl1c_trans_queue type)
1535 {
1536 	struct atl1c_tpd_ring *tpd_ring = &adapter->tpd_ring[type];
1537 	struct atl1c_buffer *buffer_info;
1538 	struct pci_dev *pdev = adapter->pdev;
1539 	u16 next_to_clean = atomic_read(&tpd_ring->next_to_clean);
1540 	u16 hw_next_to_clean;
1541 	u16 reg;
1542 	unsigned int total_bytes = 0, total_packets = 0;
1543 
1544 	reg = type == atl1c_trans_high ? REG_TPD_PRI1_CIDX : REG_TPD_PRI0_CIDX;
1545 
1546 	AT_READ_REGW(&adapter->hw, reg, &hw_next_to_clean);
1547 
1548 	while (next_to_clean != hw_next_to_clean) {
1549 		buffer_info = &tpd_ring->buffer_info[next_to_clean];
1550 		if (buffer_info->skb) {
1551 			total_bytes += buffer_info->skb->len;
1552 			total_packets++;
1553 		}
1554 		atl1c_clean_buffer(pdev, buffer_info);
1555 		if (++next_to_clean == tpd_ring->count)
1556 			next_to_clean = 0;
1557 		atomic_set(&tpd_ring->next_to_clean, next_to_clean);
1558 	}
1559 
1560 	netdev_completed_queue(adapter->netdev, total_packets, total_bytes);
1561 
1562 	if (netif_queue_stopped(adapter->netdev) &&
1563 			netif_carrier_ok(adapter->netdev)) {
1564 		netif_wake_queue(adapter->netdev);
1565 	}
1566 
1567 	return true;
1568 }
1569 
1570 /**
1571  * atl1c_intr - Interrupt Handler
1572  * @irq: interrupt number
1573  * @data: pointer to a network interface device structure
1574  */
1575 static irqreturn_t atl1c_intr(int irq, void *data)
1576 {
1577 	struct net_device *netdev  = data;
1578 	struct atl1c_adapter *adapter = netdev_priv(netdev);
1579 	struct pci_dev *pdev = adapter->pdev;
1580 	struct atl1c_hw *hw = &adapter->hw;
1581 	int max_ints = AT_MAX_INT_WORK;
1582 	int handled = IRQ_NONE;
1583 	u32 status;
1584 	u32 reg_data;
1585 
1586 	do {
1587 		AT_READ_REG(hw, REG_ISR, &reg_data);
1588 		status = reg_data & hw->intr_mask;
1589 
1590 		if (status == 0 || (status & ISR_DIS_INT) != 0) {
1591 			if (max_ints != AT_MAX_INT_WORK)
1592 				handled = IRQ_HANDLED;
1593 			break;
1594 		}
1595 		/* link event */
1596 		if (status & ISR_GPHY)
1597 			atl1c_clear_phy_int(adapter);
1598 		/* Ack ISR */
1599 		AT_WRITE_REG(hw, REG_ISR, status | ISR_DIS_INT);
1600 		if (status & ISR_RX_PKT) {
1601 			if (likely(napi_schedule_prep(&adapter->napi))) {
1602 				hw->intr_mask &= ~ISR_RX_PKT;
1603 				AT_WRITE_REG(hw, REG_IMR, hw->intr_mask);
1604 				__napi_schedule(&adapter->napi);
1605 			}
1606 		}
1607 		if (status & ISR_TX_PKT)
1608 			atl1c_clean_tx_irq(adapter, atl1c_trans_normal);
1609 
1610 		handled = IRQ_HANDLED;
1611 		/* check if PCIE PHY Link down */
1612 		if (status & ISR_ERROR) {
1613 			if (netif_msg_hw(adapter))
1614 				dev_err(&pdev->dev,
1615 					"atl1c hardware error (status = 0x%x)\n",
1616 					status & ISR_ERROR);
1617 			/* reset MAC */
1618 			set_bit(ATL1C_WORK_EVENT_RESET, &adapter->work_event);
1619 			schedule_work(&adapter->common_task);
1620 			return IRQ_HANDLED;
1621 		}
1622 
1623 		if (status & ISR_OVER)
1624 			if (netif_msg_intr(adapter))
1625 				dev_warn(&pdev->dev,
1626 					"TX/RX overflow (status = 0x%x)\n",
1627 					status & ISR_OVER);
1628 
1629 		/* link event */
1630 		if (status & (ISR_GPHY | ISR_MANUAL)) {
1631 			netdev->stats.tx_carrier_errors++;
1632 			atl1c_link_chg_event(adapter);
1633 			break;
1634 		}
1635 
1636 	} while (--max_ints > 0);
1637 	/* re-enable Interrupt*/
1638 	AT_WRITE_REG(&adapter->hw, REG_ISR, 0);
1639 	return handled;
1640 }
1641 
1642 static inline void atl1c_rx_checksum(struct atl1c_adapter *adapter,
1643 		  struct sk_buff *skb, struct atl1c_recv_ret_status *prrs)
1644 {
1645 	/*
1646 	 * The pid field in RRS in not correct sometimes, so we
1647 	 * cannot figure out if the packet is fragmented or not,
1648 	 * so we tell the KERNEL CHECKSUM_NONE
1649 	 */
1650 	skb_checksum_none_assert(skb);
1651 }
1652 
1653 static struct sk_buff *atl1c_alloc_skb(struct atl1c_adapter *adapter)
1654 {
1655 	struct sk_buff *skb;
1656 	struct page *page;
1657 
1658 	if (adapter->rx_frag_size > PAGE_SIZE)
1659 		return netdev_alloc_skb(adapter->netdev,
1660 					adapter->rx_buffer_len);
1661 
1662 	page = adapter->rx_page;
1663 	if (!page) {
1664 		adapter->rx_page = page = alloc_page(GFP_ATOMIC);
1665 		if (unlikely(!page))
1666 			return NULL;
1667 		adapter->rx_page_offset = 0;
1668 	}
1669 
1670 	skb = build_skb(page_address(page) + adapter->rx_page_offset,
1671 			adapter->rx_frag_size);
1672 	if (likely(skb)) {
1673 		skb_reserve(skb, NET_SKB_PAD);
1674 		adapter->rx_page_offset += adapter->rx_frag_size;
1675 		if (adapter->rx_page_offset >= PAGE_SIZE)
1676 			adapter->rx_page = NULL;
1677 		else
1678 			get_page(page);
1679 	}
1680 	return skb;
1681 }
1682 
1683 static int atl1c_alloc_rx_buffer(struct atl1c_adapter *adapter)
1684 {
1685 	struct atl1c_rfd_ring *rfd_ring = &adapter->rfd_ring;
1686 	struct pci_dev *pdev = adapter->pdev;
1687 	struct atl1c_buffer *buffer_info, *next_info;
1688 	struct sk_buff *skb;
1689 	void *vir_addr = NULL;
1690 	u16 num_alloc = 0;
1691 	u16 rfd_next_to_use, next_next;
1692 	struct atl1c_rx_free_desc *rfd_desc;
1693 	dma_addr_t mapping;
1694 
1695 	next_next = rfd_next_to_use = rfd_ring->next_to_use;
1696 	if (++next_next == rfd_ring->count)
1697 		next_next = 0;
1698 	buffer_info = &rfd_ring->buffer_info[rfd_next_to_use];
1699 	next_info = &rfd_ring->buffer_info[next_next];
1700 
1701 	while (next_info->flags & ATL1C_BUFFER_FREE) {
1702 		rfd_desc = ATL1C_RFD_DESC(rfd_ring, rfd_next_to_use);
1703 
1704 		skb = atl1c_alloc_skb(adapter);
1705 		if (unlikely(!skb)) {
1706 			if (netif_msg_rx_err(adapter))
1707 				dev_warn(&pdev->dev, "alloc rx buffer failed\n");
1708 			break;
1709 		}
1710 
1711 		/*
1712 		 * Make buffer alignment 2 beyond a 16 byte boundary
1713 		 * this will result in a 16 byte aligned IP header after
1714 		 * the 14 byte MAC header is removed
1715 		 */
1716 		vir_addr = skb->data;
1717 		ATL1C_SET_BUFFER_STATE(buffer_info, ATL1C_BUFFER_BUSY);
1718 		buffer_info->skb = skb;
1719 		buffer_info->length = adapter->rx_buffer_len;
1720 		mapping = pci_map_single(pdev, vir_addr,
1721 						buffer_info->length,
1722 						PCI_DMA_FROMDEVICE);
1723 		if (unlikely(pci_dma_mapping_error(pdev, mapping))) {
1724 			dev_kfree_skb(skb);
1725 			buffer_info->skb = NULL;
1726 			buffer_info->length = 0;
1727 			ATL1C_SET_BUFFER_STATE(buffer_info, ATL1C_BUFFER_FREE);
1728 			netif_warn(adapter, rx_err, adapter->netdev, "RX pci_map_single failed");
1729 			break;
1730 		}
1731 		buffer_info->dma = mapping;
1732 		ATL1C_SET_PCIMAP_TYPE(buffer_info, ATL1C_PCIMAP_SINGLE,
1733 			ATL1C_PCIMAP_FROMDEVICE);
1734 		rfd_desc->buffer_addr = cpu_to_le64(buffer_info->dma);
1735 		rfd_next_to_use = next_next;
1736 		if (++next_next == rfd_ring->count)
1737 			next_next = 0;
1738 		buffer_info = &rfd_ring->buffer_info[rfd_next_to_use];
1739 		next_info = &rfd_ring->buffer_info[next_next];
1740 		num_alloc++;
1741 	}
1742 
1743 	if (num_alloc) {
1744 		/* TODO: update mailbox here */
1745 		wmb();
1746 		rfd_ring->next_to_use = rfd_next_to_use;
1747 		AT_WRITE_REG(&adapter->hw, REG_MB_RFD0_PROD_IDX,
1748 			rfd_ring->next_to_use & MB_RFDX_PROD_IDX_MASK);
1749 	}
1750 
1751 	return num_alloc;
1752 }
1753 
1754 static void atl1c_clean_rrd(struct atl1c_rrd_ring *rrd_ring,
1755 			struct	atl1c_recv_ret_status *rrs, u16 num)
1756 {
1757 	u16 i;
1758 	/* the relationship between rrd and rfd is one map one */
1759 	for (i = 0; i < num; i++, rrs = ATL1C_RRD_DESC(rrd_ring,
1760 					rrd_ring->next_to_clean)) {
1761 		rrs->word3 &= ~RRS_RXD_UPDATED;
1762 		if (++rrd_ring->next_to_clean == rrd_ring->count)
1763 			rrd_ring->next_to_clean = 0;
1764 	}
1765 }
1766 
1767 static void atl1c_clean_rfd(struct atl1c_rfd_ring *rfd_ring,
1768 	struct atl1c_recv_ret_status *rrs, u16 num)
1769 {
1770 	u16 i;
1771 	u16 rfd_index;
1772 	struct atl1c_buffer *buffer_info = rfd_ring->buffer_info;
1773 
1774 	rfd_index = (rrs->word0 >> RRS_RX_RFD_INDEX_SHIFT) &
1775 			RRS_RX_RFD_INDEX_MASK;
1776 	for (i = 0; i < num; i++) {
1777 		buffer_info[rfd_index].skb = NULL;
1778 		ATL1C_SET_BUFFER_STATE(&buffer_info[rfd_index],
1779 					ATL1C_BUFFER_FREE);
1780 		if (++rfd_index == rfd_ring->count)
1781 			rfd_index = 0;
1782 	}
1783 	rfd_ring->next_to_clean = rfd_index;
1784 }
1785 
1786 static void atl1c_clean_rx_irq(struct atl1c_adapter *adapter,
1787 		   int *work_done, int work_to_do)
1788 {
1789 	u16 rfd_num, rfd_index;
1790 	u16 count = 0;
1791 	u16 length;
1792 	struct pci_dev *pdev = adapter->pdev;
1793 	struct net_device *netdev  = adapter->netdev;
1794 	struct atl1c_rfd_ring *rfd_ring = &adapter->rfd_ring;
1795 	struct atl1c_rrd_ring *rrd_ring = &adapter->rrd_ring;
1796 	struct sk_buff *skb;
1797 	struct atl1c_recv_ret_status *rrs;
1798 	struct atl1c_buffer *buffer_info;
1799 
1800 	while (1) {
1801 		if (*work_done >= work_to_do)
1802 			break;
1803 		rrs = ATL1C_RRD_DESC(rrd_ring, rrd_ring->next_to_clean);
1804 		if (likely(RRS_RXD_IS_VALID(rrs->word3))) {
1805 			rfd_num = (rrs->word0 >> RRS_RX_RFD_CNT_SHIFT) &
1806 				RRS_RX_RFD_CNT_MASK;
1807 			if (unlikely(rfd_num != 1))
1808 				/* TODO support mul rfd*/
1809 				if (netif_msg_rx_err(adapter))
1810 					dev_warn(&pdev->dev,
1811 						"Multi rfd not support yet!\n");
1812 			goto rrs_checked;
1813 		} else {
1814 			break;
1815 		}
1816 rrs_checked:
1817 		atl1c_clean_rrd(rrd_ring, rrs, rfd_num);
1818 		if (rrs->word3 & (RRS_RX_ERR_SUM | RRS_802_3_LEN_ERR)) {
1819 			atl1c_clean_rfd(rfd_ring, rrs, rfd_num);
1820 			if (netif_msg_rx_err(adapter))
1821 				dev_warn(&pdev->dev,
1822 					 "wrong packet! rrs word3 is %x\n",
1823 					 rrs->word3);
1824 			continue;
1825 		}
1826 
1827 		length = le16_to_cpu((rrs->word3 >> RRS_PKT_SIZE_SHIFT) &
1828 				RRS_PKT_SIZE_MASK);
1829 		/* Good Receive */
1830 		if (likely(rfd_num == 1)) {
1831 			rfd_index = (rrs->word0 >> RRS_RX_RFD_INDEX_SHIFT) &
1832 					RRS_RX_RFD_INDEX_MASK;
1833 			buffer_info = &rfd_ring->buffer_info[rfd_index];
1834 			pci_unmap_single(pdev, buffer_info->dma,
1835 				buffer_info->length, PCI_DMA_FROMDEVICE);
1836 			skb = buffer_info->skb;
1837 		} else {
1838 			/* TODO */
1839 			if (netif_msg_rx_err(adapter))
1840 				dev_warn(&pdev->dev,
1841 					"Multi rfd not support yet!\n");
1842 			break;
1843 		}
1844 		atl1c_clean_rfd(rfd_ring, rrs, rfd_num);
1845 		skb_put(skb, length - ETH_FCS_LEN);
1846 		skb->protocol = eth_type_trans(skb, netdev);
1847 		atl1c_rx_checksum(adapter, skb, rrs);
1848 		if (rrs->word3 & RRS_VLAN_INS) {
1849 			u16 vlan;
1850 
1851 			AT_TAG_TO_VLAN(rrs->vlan_tag, vlan);
1852 			vlan = le16_to_cpu(vlan);
1853 			__vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), vlan);
1854 		}
1855 		netif_receive_skb(skb);
1856 
1857 		(*work_done)++;
1858 		count++;
1859 	}
1860 	if (count)
1861 		atl1c_alloc_rx_buffer(adapter);
1862 }
1863 
1864 /**
1865  * atl1c_clean - NAPI Rx polling callback
1866  */
1867 static int atl1c_clean(struct napi_struct *napi, int budget)
1868 {
1869 	struct atl1c_adapter *adapter =
1870 			container_of(napi, struct atl1c_adapter, napi);
1871 	int work_done = 0;
1872 
1873 	/* Keep link state information with original netdev */
1874 	if (!netif_carrier_ok(adapter->netdev))
1875 		goto quit_polling;
1876 	/* just enable one RXQ */
1877 	atl1c_clean_rx_irq(adapter, &work_done, budget);
1878 
1879 	if (work_done < budget) {
1880 quit_polling:
1881 		napi_complete_done(napi, work_done);
1882 		adapter->hw.intr_mask |= ISR_RX_PKT;
1883 		AT_WRITE_REG(&adapter->hw, REG_IMR, adapter->hw.intr_mask);
1884 	}
1885 	return work_done;
1886 }
1887 
1888 #ifdef CONFIG_NET_POLL_CONTROLLER
1889 
1890 /*
1891  * Polling 'interrupt' - used by things like netconsole to send skbs
1892  * without having to re-enable interrupts. It's not called while
1893  * the interrupt routine is executing.
1894  */
1895 static void atl1c_netpoll(struct net_device *netdev)
1896 {
1897 	struct atl1c_adapter *adapter = netdev_priv(netdev);
1898 
1899 	disable_irq(adapter->pdev->irq);
1900 	atl1c_intr(adapter->pdev->irq, netdev);
1901 	enable_irq(adapter->pdev->irq);
1902 }
1903 #endif
1904 
1905 static inline u16 atl1c_tpd_avail(struct atl1c_adapter *adapter, enum atl1c_trans_queue type)
1906 {
1907 	struct atl1c_tpd_ring *tpd_ring = &adapter->tpd_ring[type];
1908 	u16 next_to_use = 0;
1909 	u16 next_to_clean = 0;
1910 
1911 	next_to_clean = atomic_read(&tpd_ring->next_to_clean);
1912 	next_to_use   = tpd_ring->next_to_use;
1913 
1914 	return (u16)(next_to_clean > next_to_use) ?
1915 		(next_to_clean - next_to_use - 1) :
1916 		(tpd_ring->count + next_to_clean - next_to_use - 1);
1917 }
1918 
1919 /*
1920  * get next usable tpd
1921  * Note: should call atl1c_tdp_avail to make sure
1922  * there is enough tpd to use
1923  */
1924 static struct atl1c_tpd_desc *atl1c_get_tpd(struct atl1c_adapter *adapter,
1925 	enum atl1c_trans_queue type)
1926 {
1927 	struct atl1c_tpd_ring *tpd_ring = &adapter->tpd_ring[type];
1928 	struct atl1c_tpd_desc *tpd_desc;
1929 	u16 next_to_use = 0;
1930 
1931 	next_to_use = tpd_ring->next_to_use;
1932 	if (++tpd_ring->next_to_use == tpd_ring->count)
1933 		tpd_ring->next_to_use = 0;
1934 	tpd_desc = ATL1C_TPD_DESC(tpd_ring, next_to_use);
1935 	memset(tpd_desc, 0, sizeof(struct atl1c_tpd_desc));
1936 	return	tpd_desc;
1937 }
1938 
1939 static struct atl1c_buffer *
1940 atl1c_get_tx_buffer(struct atl1c_adapter *adapter, struct atl1c_tpd_desc *tpd)
1941 {
1942 	struct atl1c_tpd_ring *tpd_ring = adapter->tpd_ring;
1943 
1944 	return &tpd_ring->buffer_info[tpd -
1945 			(struct atl1c_tpd_desc *)tpd_ring->desc];
1946 }
1947 
1948 /* Calculate the transmit packet descript needed*/
1949 static u16 atl1c_cal_tpd_req(const struct sk_buff *skb)
1950 {
1951 	u16 tpd_req;
1952 	u16 proto_hdr_len = 0;
1953 
1954 	tpd_req = skb_shinfo(skb)->nr_frags + 1;
1955 
1956 	if (skb_is_gso(skb)) {
1957 		proto_hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
1958 		if (proto_hdr_len < skb_headlen(skb))
1959 			tpd_req++;
1960 		if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6)
1961 			tpd_req++;
1962 	}
1963 	return tpd_req;
1964 }
1965 
1966 static int atl1c_tso_csum(struct atl1c_adapter *adapter,
1967 			  struct sk_buff *skb,
1968 			  struct atl1c_tpd_desc **tpd,
1969 			  enum atl1c_trans_queue type)
1970 {
1971 	struct pci_dev *pdev = adapter->pdev;
1972 	unsigned short offload_type;
1973 	u8 hdr_len;
1974 	u32 real_len;
1975 
1976 	if (skb_is_gso(skb)) {
1977 		int err;
1978 
1979 		err = skb_cow_head(skb, 0);
1980 		if (err < 0)
1981 			return err;
1982 
1983 		offload_type = skb_shinfo(skb)->gso_type;
1984 
1985 		if (offload_type & SKB_GSO_TCPV4) {
1986 			real_len = (((unsigned char *)ip_hdr(skb) - skb->data)
1987 					+ ntohs(ip_hdr(skb)->tot_len));
1988 
1989 			if (real_len < skb->len)
1990 				pskb_trim(skb, real_len);
1991 
1992 			hdr_len = (skb_transport_offset(skb) + tcp_hdrlen(skb));
1993 			if (unlikely(skb->len == hdr_len)) {
1994 				/* only xsum need */
1995 				if (netif_msg_tx_queued(adapter))
1996 					dev_warn(&pdev->dev,
1997 						"IPV4 tso with zero data??\n");
1998 				goto check_sum;
1999 			} else {
2000 				ip_hdr(skb)->check = 0;
2001 				tcp_hdr(skb)->check = ~csum_tcpudp_magic(
2002 							ip_hdr(skb)->saddr,
2003 							ip_hdr(skb)->daddr,
2004 							0, IPPROTO_TCP, 0);
2005 				(*tpd)->word1 |= 1 << TPD_IPV4_PACKET_SHIFT;
2006 			}
2007 		}
2008 
2009 		if (offload_type & SKB_GSO_TCPV6) {
2010 			struct atl1c_tpd_ext_desc *etpd =
2011 				*(struct atl1c_tpd_ext_desc **)(tpd);
2012 
2013 			memset(etpd, 0, sizeof(struct atl1c_tpd_ext_desc));
2014 			*tpd = atl1c_get_tpd(adapter, type);
2015 			ipv6_hdr(skb)->payload_len = 0;
2016 			/* check payload == 0 byte ? */
2017 			hdr_len = (skb_transport_offset(skb) + tcp_hdrlen(skb));
2018 			if (unlikely(skb->len == hdr_len)) {
2019 				/* only xsum need */
2020 				if (netif_msg_tx_queued(adapter))
2021 					dev_warn(&pdev->dev,
2022 						"IPV6 tso with zero data??\n");
2023 				goto check_sum;
2024 			} else
2025 				tcp_v6_gso_csum_prep(skb);
2026 
2027 			etpd->word1 |= 1 << TPD_LSO_EN_SHIFT;
2028 			etpd->word1 |= 1 << TPD_LSO_VER_SHIFT;
2029 			etpd->pkt_len = cpu_to_le32(skb->len);
2030 			(*tpd)->word1 |= 1 << TPD_LSO_VER_SHIFT;
2031 		}
2032 
2033 		(*tpd)->word1 |= 1 << TPD_LSO_EN_SHIFT;
2034 		(*tpd)->word1 |= (skb_transport_offset(skb) & TPD_TCPHDR_OFFSET_MASK) <<
2035 				TPD_TCPHDR_OFFSET_SHIFT;
2036 		(*tpd)->word1 |= (skb_shinfo(skb)->gso_size & TPD_MSS_MASK) <<
2037 				TPD_MSS_SHIFT;
2038 		return 0;
2039 	}
2040 
2041 check_sum:
2042 	if (likely(skb->ip_summed == CHECKSUM_PARTIAL)) {
2043 		u8 css, cso;
2044 		cso = skb_checksum_start_offset(skb);
2045 
2046 		if (unlikely(cso & 0x1)) {
2047 			if (netif_msg_tx_err(adapter))
2048 				dev_err(&adapter->pdev->dev,
2049 					"payload offset should not an event number\n");
2050 			return -1;
2051 		} else {
2052 			css = cso + skb->csum_offset;
2053 
2054 			(*tpd)->word1 |= ((cso >> 1) & TPD_PLOADOFFSET_MASK) <<
2055 					TPD_PLOADOFFSET_SHIFT;
2056 			(*tpd)->word1 |= ((css >> 1) & TPD_CCSUM_OFFSET_MASK) <<
2057 					TPD_CCSUM_OFFSET_SHIFT;
2058 			(*tpd)->word1 |= 1 << TPD_CCSUM_EN_SHIFT;
2059 		}
2060 	}
2061 	return 0;
2062 }
2063 
2064 static void atl1c_tx_rollback(struct atl1c_adapter *adpt,
2065 			      struct atl1c_tpd_desc *first_tpd,
2066 			      enum atl1c_trans_queue type)
2067 {
2068 	struct atl1c_tpd_ring *tpd_ring = &adpt->tpd_ring[type];
2069 	struct atl1c_buffer *buffer_info;
2070 	struct atl1c_tpd_desc *tpd;
2071 	u16 first_index, index;
2072 
2073 	first_index = first_tpd - (struct atl1c_tpd_desc *)tpd_ring->desc;
2074 	index = first_index;
2075 	while (index != tpd_ring->next_to_use) {
2076 		tpd = ATL1C_TPD_DESC(tpd_ring, index);
2077 		buffer_info = &tpd_ring->buffer_info[index];
2078 		atl1c_clean_buffer(adpt->pdev, buffer_info);
2079 		memset(tpd, 0, sizeof(struct atl1c_tpd_desc));
2080 		if (++index == tpd_ring->count)
2081 			index = 0;
2082 	}
2083 	tpd_ring->next_to_use = first_index;
2084 }
2085 
2086 static int atl1c_tx_map(struct atl1c_adapter *adapter,
2087 		      struct sk_buff *skb, struct atl1c_tpd_desc *tpd,
2088 			enum atl1c_trans_queue type)
2089 {
2090 	struct atl1c_tpd_desc *use_tpd = NULL;
2091 	struct atl1c_buffer *buffer_info = NULL;
2092 	u16 buf_len = skb_headlen(skb);
2093 	u16 map_len = 0;
2094 	u16 mapped_len = 0;
2095 	u16 hdr_len = 0;
2096 	u16 nr_frags;
2097 	u16 f;
2098 	int tso;
2099 
2100 	nr_frags = skb_shinfo(skb)->nr_frags;
2101 	tso = (tpd->word1 >> TPD_LSO_EN_SHIFT) & TPD_LSO_EN_MASK;
2102 	if (tso) {
2103 		/* TSO */
2104 		map_len = hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
2105 		use_tpd = tpd;
2106 
2107 		buffer_info = atl1c_get_tx_buffer(adapter, use_tpd);
2108 		buffer_info->length = map_len;
2109 		buffer_info->dma = pci_map_single(adapter->pdev,
2110 					skb->data, hdr_len, PCI_DMA_TODEVICE);
2111 		if (unlikely(pci_dma_mapping_error(adapter->pdev,
2112 						   buffer_info->dma)))
2113 			goto err_dma;
2114 		ATL1C_SET_BUFFER_STATE(buffer_info, ATL1C_BUFFER_BUSY);
2115 		ATL1C_SET_PCIMAP_TYPE(buffer_info, ATL1C_PCIMAP_SINGLE,
2116 			ATL1C_PCIMAP_TODEVICE);
2117 		mapped_len += map_len;
2118 		use_tpd->buffer_addr = cpu_to_le64(buffer_info->dma);
2119 		use_tpd->buffer_len = cpu_to_le16(buffer_info->length);
2120 	}
2121 
2122 	if (mapped_len < buf_len) {
2123 		/* mapped_len == 0, means we should use the first tpd,
2124 		   which is given by caller  */
2125 		if (mapped_len == 0)
2126 			use_tpd = tpd;
2127 		else {
2128 			use_tpd = atl1c_get_tpd(adapter, type);
2129 			memcpy(use_tpd, tpd, sizeof(struct atl1c_tpd_desc));
2130 		}
2131 		buffer_info = atl1c_get_tx_buffer(adapter, use_tpd);
2132 		buffer_info->length = buf_len - mapped_len;
2133 		buffer_info->dma =
2134 			pci_map_single(adapter->pdev, skb->data + mapped_len,
2135 					buffer_info->length, PCI_DMA_TODEVICE);
2136 		if (unlikely(pci_dma_mapping_error(adapter->pdev,
2137 						   buffer_info->dma)))
2138 			goto err_dma;
2139 
2140 		ATL1C_SET_BUFFER_STATE(buffer_info, ATL1C_BUFFER_BUSY);
2141 		ATL1C_SET_PCIMAP_TYPE(buffer_info, ATL1C_PCIMAP_SINGLE,
2142 			ATL1C_PCIMAP_TODEVICE);
2143 		use_tpd->buffer_addr = cpu_to_le64(buffer_info->dma);
2144 		use_tpd->buffer_len  = cpu_to_le16(buffer_info->length);
2145 	}
2146 
2147 	for (f = 0; f < nr_frags; f++) {
2148 		skb_frag_t *frag = &skb_shinfo(skb)->frags[f];
2149 
2150 		use_tpd = atl1c_get_tpd(adapter, type);
2151 		memcpy(use_tpd, tpd, sizeof(struct atl1c_tpd_desc));
2152 
2153 		buffer_info = atl1c_get_tx_buffer(adapter, use_tpd);
2154 		buffer_info->length = skb_frag_size(frag);
2155 		buffer_info->dma = skb_frag_dma_map(&adapter->pdev->dev,
2156 						    frag, 0,
2157 						    buffer_info->length,
2158 						    DMA_TO_DEVICE);
2159 		if (dma_mapping_error(&adapter->pdev->dev, buffer_info->dma))
2160 			goto err_dma;
2161 
2162 		ATL1C_SET_BUFFER_STATE(buffer_info, ATL1C_BUFFER_BUSY);
2163 		ATL1C_SET_PCIMAP_TYPE(buffer_info, ATL1C_PCIMAP_PAGE,
2164 			ATL1C_PCIMAP_TODEVICE);
2165 		use_tpd->buffer_addr = cpu_to_le64(buffer_info->dma);
2166 		use_tpd->buffer_len  = cpu_to_le16(buffer_info->length);
2167 	}
2168 
2169 	/* The last tpd */
2170 	use_tpd->word1 |= 1 << TPD_EOP_SHIFT;
2171 	/* The last buffer info contain the skb address,
2172 	   so it will be free after unmap */
2173 	buffer_info->skb = skb;
2174 
2175 	return 0;
2176 
2177 err_dma:
2178 	buffer_info->dma = 0;
2179 	buffer_info->length = 0;
2180 	return -1;
2181 }
2182 
2183 static void atl1c_tx_queue(struct atl1c_adapter *adapter, struct sk_buff *skb,
2184 			   struct atl1c_tpd_desc *tpd, enum atl1c_trans_queue type)
2185 {
2186 	struct atl1c_tpd_ring *tpd_ring = &adapter->tpd_ring[type];
2187 	u16 reg;
2188 
2189 	reg = type == atl1c_trans_high ? REG_TPD_PRI1_PIDX : REG_TPD_PRI0_PIDX;
2190 	AT_WRITE_REGW(&adapter->hw, reg, tpd_ring->next_to_use);
2191 }
2192 
2193 static netdev_tx_t atl1c_xmit_frame(struct sk_buff *skb,
2194 					  struct net_device *netdev)
2195 {
2196 	struct atl1c_adapter *adapter = netdev_priv(netdev);
2197 	u16 tpd_req;
2198 	struct atl1c_tpd_desc *tpd;
2199 	enum atl1c_trans_queue type = atl1c_trans_normal;
2200 
2201 	if (test_bit(__AT_DOWN, &adapter->flags)) {
2202 		dev_kfree_skb_any(skb);
2203 		return NETDEV_TX_OK;
2204 	}
2205 
2206 	tpd_req = atl1c_cal_tpd_req(skb);
2207 
2208 	if (atl1c_tpd_avail(adapter, type) < tpd_req) {
2209 		/* no enough descriptor, just stop queue */
2210 		netif_stop_queue(netdev);
2211 		return NETDEV_TX_BUSY;
2212 	}
2213 
2214 	tpd = atl1c_get_tpd(adapter, type);
2215 
2216 	/* do TSO and check sum */
2217 	if (atl1c_tso_csum(adapter, skb, &tpd, type) != 0) {
2218 		dev_kfree_skb_any(skb);
2219 		return NETDEV_TX_OK;
2220 	}
2221 
2222 	if (unlikely(skb_vlan_tag_present(skb))) {
2223 		u16 vlan = skb_vlan_tag_get(skb);
2224 		__le16 tag;
2225 
2226 		vlan = cpu_to_le16(vlan);
2227 		AT_VLAN_TO_TAG(vlan, tag);
2228 		tpd->word1 |= 1 << TPD_INS_VTAG_SHIFT;
2229 		tpd->vlan_tag = tag;
2230 	}
2231 
2232 	if (skb_network_offset(skb) != ETH_HLEN)
2233 		tpd->word1 |= 1 << TPD_ETH_TYPE_SHIFT; /* Ethernet frame */
2234 
2235 	if (atl1c_tx_map(adapter, skb, tpd, type) < 0) {
2236 		netif_info(adapter, tx_done, adapter->netdev,
2237 			   "tx-skb dropped due to dma error\n");
2238 		/* roll back tpd/buffer */
2239 		atl1c_tx_rollback(adapter, tpd, type);
2240 		dev_kfree_skb_any(skb);
2241 	} else {
2242 		netdev_sent_queue(adapter->netdev, skb->len);
2243 		atl1c_tx_queue(adapter, skb, tpd, type);
2244 	}
2245 
2246 	return NETDEV_TX_OK;
2247 }
2248 
2249 static void atl1c_free_irq(struct atl1c_adapter *adapter)
2250 {
2251 	struct net_device *netdev = adapter->netdev;
2252 
2253 	free_irq(adapter->pdev->irq, netdev);
2254 
2255 	if (adapter->have_msi)
2256 		pci_disable_msi(adapter->pdev);
2257 }
2258 
2259 static int atl1c_request_irq(struct atl1c_adapter *adapter)
2260 {
2261 	struct pci_dev    *pdev   = adapter->pdev;
2262 	struct net_device *netdev = adapter->netdev;
2263 	int flags = 0;
2264 	int err = 0;
2265 
2266 	adapter->have_msi = true;
2267 	err = pci_enable_msi(adapter->pdev);
2268 	if (err) {
2269 		if (netif_msg_ifup(adapter))
2270 			dev_err(&pdev->dev,
2271 				"Unable to allocate MSI interrupt Error: %d\n",
2272 				err);
2273 		adapter->have_msi = false;
2274 	}
2275 
2276 	if (!adapter->have_msi)
2277 		flags |= IRQF_SHARED;
2278 	err = request_irq(adapter->pdev->irq, atl1c_intr, flags,
2279 			netdev->name, netdev);
2280 	if (err) {
2281 		if (netif_msg_ifup(adapter))
2282 			dev_err(&pdev->dev,
2283 				"Unable to allocate interrupt Error: %d\n",
2284 				err);
2285 		if (adapter->have_msi)
2286 			pci_disable_msi(adapter->pdev);
2287 		return err;
2288 	}
2289 	if (netif_msg_ifup(adapter))
2290 		dev_dbg(&pdev->dev, "atl1c_request_irq OK\n");
2291 	return err;
2292 }
2293 
2294 
2295 static void atl1c_reset_dma_ring(struct atl1c_adapter *adapter)
2296 {
2297 	/* release tx-pending skbs and reset tx/rx ring index */
2298 	atl1c_clean_tx_ring(adapter, atl1c_trans_normal);
2299 	atl1c_clean_tx_ring(adapter, atl1c_trans_high);
2300 	atl1c_clean_rx_ring(adapter);
2301 }
2302 
2303 static int atl1c_up(struct atl1c_adapter *adapter)
2304 {
2305 	struct net_device *netdev = adapter->netdev;
2306 	int err;
2307 
2308 	netif_carrier_off(netdev);
2309 
2310 	err = atl1c_configure(adapter);
2311 	if (unlikely(err))
2312 		goto err_up;
2313 
2314 	err = atl1c_request_irq(adapter);
2315 	if (unlikely(err))
2316 		goto err_up;
2317 
2318 	atl1c_check_link_status(adapter);
2319 	clear_bit(__AT_DOWN, &adapter->flags);
2320 	napi_enable(&adapter->napi);
2321 	atl1c_irq_enable(adapter);
2322 	netif_start_queue(netdev);
2323 	return err;
2324 
2325 err_up:
2326 	atl1c_clean_rx_ring(adapter);
2327 	return err;
2328 }
2329 
2330 static void atl1c_down(struct atl1c_adapter *adapter)
2331 {
2332 	struct net_device *netdev = adapter->netdev;
2333 
2334 	atl1c_del_timer(adapter);
2335 	adapter->work_event = 0; /* clear all event */
2336 	/* signal that we're down so the interrupt handler does not
2337 	 * reschedule our watchdog timer */
2338 	set_bit(__AT_DOWN, &adapter->flags);
2339 	netif_carrier_off(netdev);
2340 	napi_disable(&adapter->napi);
2341 	atl1c_irq_disable(adapter);
2342 	atl1c_free_irq(adapter);
2343 	/* disable ASPM if device inactive */
2344 	atl1c_disable_l0s_l1(&adapter->hw);
2345 	/* reset MAC to disable all RX/TX */
2346 	atl1c_reset_mac(&adapter->hw);
2347 	msleep(1);
2348 
2349 	adapter->link_speed = SPEED_0;
2350 	adapter->link_duplex = -1;
2351 	atl1c_reset_dma_ring(adapter);
2352 }
2353 
2354 /**
2355  * atl1c_open - Called when a network interface is made active
2356  * @netdev: network interface device structure
2357  *
2358  * Returns 0 on success, negative value on failure
2359  *
2360  * The open entry point is called when a network interface is made
2361  * active by the system (IFF_UP).  At this point all resources needed
2362  * for transmit and receive operations are allocated, the interrupt
2363  * handler is registered with the OS, the watchdog timer is started,
2364  * and the stack is notified that the interface is ready.
2365  */
2366 static int atl1c_open(struct net_device *netdev)
2367 {
2368 	struct atl1c_adapter *adapter = netdev_priv(netdev);
2369 	int err;
2370 
2371 	/* disallow open during test */
2372 	if (test_bit(__AT_TESTING, &adapter->flags))
2373 		return -EBUSY;
2374 
2375 	/* allocate rx/tx dma buffer & descriptors */
2376 	err = atl1c_setup_ring_resources(adapter);
2377 	if (unlikely(err))
2378 		return err;
2379 
2380 	err = atl1c_up(adapter);
2381 	if (unlikely(err))
2382 		goto err_up;
2383 
2384 	return 0;
2385 
2386 err_up:
2387 	atl1c_free_irq(adapter);
2388 	atl1c_free_ring_resources(adapter);
2389 	atl1c_reset_mac(&adapter->hw);
2390 	return err;
2391 }
2392 
2393 /**
2394  * atl1c_close - Disables a network interface
2395  * @netdev: network interface device structure
2396  *
2397  * Returns 0, this is not allowed to fail
2398  *
2399  * The close entry point is called when an interface is de-activated
2400  * by the OS.  The hardware is still under the drivers control, but
2401  * needs to be disabled.  A global MAC reset is issued to stop the
2402  * hardware, and all transmit and receive resources are freed.
2403  */
2404 static int atl1c_close(struct net_device *netdev)
2405 {
2406 	struct atl1c_adapter *adapter = netdev_priv(netdev);
2407 
2408 	WARN_ON(test_bit(__AT_RESETTING, &adapter->flags));
2409 	set_bit(__AT_DOWN, &adapter->flags);
2410 	cancel_work_sync(&adapter->common_task);
2411 	atl1c_down(adapter);
2412 	atl1c_free_ring_resources(adapter);
2413 	return 0;
2414 }
2415 
2416 static int atl1c_suspend(struct device *dev)
2417 {
2418 	struct net_device *netdev = dev_get_drvdata(dev);
2419 	struct atl1c_adapter *adapter = netdev_priv(netdev);
2420 	struct atl1c_hw *hw = &adapter->hw;
2421 	u32 wufc = adapter->wol;
2422 
2423 	atl1c_disable_l0s_l1(hw);
2424 	if (netif_running(netdev)) {
2425 		WARN_ON(test_bit(__AT_RESETTING, &adapter->flags));
2426 		atl1c_down(adapter);
2427 	}
2428 	netif_device_detach(netdev);
2429 
2430 	if (wufc)
2431 		if (atl1c_phy_to_ps_link(hw) != 0)
2432 			dev_dbg(dev, "phy power saving failed");
2433 
2434 	atl1c_power_saving(hw, wufc);
2435 
2436 	return 0;
2437 }
2438 
2439 #ifdef CONFIG_PM_SLEEP
2440 static int atl1c_resume(struct device *dev)
2441 {
2442 	struct net_device *netdev = dev_get_drvdata(dev);
2443 	struct atl1c_adapter *adapter = netdev_priv(netdev);
2444 
2445 	AT_WRITE_REG(&adapter->hw, REG_WOL_CTRL, 0);
2446 	atl1c_reset_pcie(&adapter->hw, ATL1C_PCIE_L0S_L1_DISABLE);
2447 
2448 	atl1c_phy_reset(&adapter->hw);
2449 	atl1c_reset_mac(&adapter->hw);
2450 	atl1c_phy_init(&adapter->hw);
2451 
2452 	netif_device_attach(netdev);
2453 	if (netif_running(netdev))
2454 		atl1c_up(adapter);
2455 
2456 	return 0;
2457 }
2458 #endif
2459 
2460 static void atl1c_shutdown(struct pci_dev *pdev)
2461 {
2462 	struct net_device *netdev = pci_get_drvdata(pdev);
2463 	struct atl1c_adapter *adapter = netdev_priv(netdev);
2464 
2465 	atl1c_suspend(&pdev->dev);
2466 	pci_wake_from_d3(pdev, adapter->wol);
2467 	pci_set_power_state(pdev, PCI_D3hot);
2468 }
2469 
2470 static const struct net_device_ops atl1c_netdev_ops = {
2471 	.ndo_open		= atl1c_open,
2472 	.ndo_stop		= atl1c_close,
2473 	.ndo_validate_addr	= eth_validate_addr,
2474 	.ndo_start_xmit		= atl1c_xmit_frame,
2475 	.ndo_set_mac_address	= atl1c_set_mac_addr,
2476 	.ndo_set_rx_mode	= atl1c_set_multi,
2477 	.ndo_change_mtu		= atl1c_change_mtu,
2478 	.ndo_fix_features	= atl1c_fix_features,
2479 	.ndo_set_features	= atl1c_set_features,
2480 	.ndo_do_ioctl		= atl1c_ioctl,
2481 	.ndo_tx_timeout		= atl1c_tx_timeout,
2482 	.ndo_get_stats		= atl1c_get_stats,
2483 #ifdef CONFIG_NET_POLL_CONTROLLER
2484 	.ndo_poll_controller	= atl1c_netpoll,
2485 #endif
2486 };
2487 
2488 static int atl1c_init_netdev(struct net_device *netdev, struct pci_dev *pdev)
2489 {
2490 	SET_NETDEV_DEV(netdev, &pdev->dev);
2491 	pci_set_drvdata(pdev, netdev);
2492 
2493 	netdev->netdev_ops = &atl1c_netdev_ops;
2494 	netdev->watchdog_timeo = AT_TX_WATCHDOG;
2495 	netdev->min_mtu = ETH_ZLEN - (ETH_HLEN + VLAN_HLEN);
2496 	atl1c_set_ethtool_ops(netdev);
2497 
2498 	/* TODO: add when ready */
2499 	netdev->hw_features =	NETIF_F_SG		|
2500 				NETIF_F_HW_CSUM		|
2501 				NETIF_F_HW_VLAN_CTAG_RX	|
2502 				NETIF_F_TSO		|
2503 				NETIF_F_TSO6;
2504 	netdev->features =	netdev->hw_features	|
2505 				NETIF_F_HW_VLAN_CTAG_TX;
2506 	return 0;
2507 }
2508 
2509 /**
2510  * atl1c_probe - Device Initialization Routine
2511  * @pdev: PCI device information struct
2512  * @ent: entry in atl1c_pci_tbl
2513  *
2514  * Returns 0 on success, negative on failure
2515  *
2516  * atl1c_probe initializes an adapter identified by a pci_dev structure.
2517  * The OS initialization, configuring of the adapter private structure,
2518  * and a hardware reset occur.
2519  */
2520 static int atl1c_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
2521 {
2522 	struct net_device *netdev;
2523 	struct atl1c_adapter *adapter;
2524 	static int cards_found;
2525 
2526 	int err = 0;
2527 
2528 	/* enable device (incl. PCI PM wakeup and hotplug setup) */
2529 	err = pci_enable_device_mem(pdev);
2530 	if (err) {
2531 		dev_err(&pdev->dev, "cannot enable PCI device\n");
2532 		return err;
2533 	}
2534 
2535 	/*
2536 	 * The atl1c chip can DMA to 64-bit addresses, but it uses a single
2537 	 * shared register for the high 32 bits, so only a single, aligned,
2538 	 * 4 GB physical address range can be used at a time.
2539 	 *
2540 	 * Supporting 64-bit DMA on this hardware is more trouble than it's
2541 	 * worth.  It is far easier to limit to 32-bit DMA than update
2542 	 * various kernel subsystems to support the mechanics required by a
2543 	 * fixed-high-32-bit system.
2544 	 */
2545 	if ((pci_set_dma_mask(pdev, DMA_BIT_MASK(32)) != 0) ||
2546 	    (pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32)) != 0)) {
2547 		dev_err(&pdev->dev, "No usable DMA configuration,aborting\n");
2548 		goto err_dma;
2549 	}
2550 
2551 	err = pci_request_regions(pdev, atl1c_driver_name);
2552 	if (err) {
2553 		dev_err(&pdev->dev, "cannot obtain PCI resources\n");
2554 		goto err_pci_reg;
2555 	}
2556 
2557 	pci_set_master(pdev);
2558 
2559 	netdev = alloc_etherdev(sizeof(struct atl1c_adapter));
2560 	if (netdev == NULL) {
2561 		err = -ENOMEM;
2562 		goto err_alloc_etherdev;
2563 	}
2564 
2565 	err = atl1c_init_netdev(netdev, pdev);
2566 	if (err) {
2567 		dev_err(&pdev->dev, "init netdevice failed\n");
2568 		goto err_init_netdev;
2569 	}
2570 	adapter = netdev_priv(netdev);
2571 	adapter->bd_number = cards_found;
2572 	adapter->netdev = netdev;
2573 	adapter->pdev = pdev;
2574 	adapter->hw.adapter = adapter;
2575 	adapter->msg_enable = netif_msg_init(-1, atl1c_default_msg);
2576 	adapter->hw.hw_addr = ioremap(pci_resource_start(pdev, 0), pci_resource_len(pdev, 0));
2577 	if (!adapter->hw.hw_addr) {
2578 		err = -EIO;
2579 		dev_err(&pdev->dev, "cannot map device registers\n");
2580 		goto err_ioremap;
2581 	}
2582 
2583 	/* init mii data */
2584 	adapter->mii.dev = netdev;
2585 	adapter->mii.mdio_read  = atl1c_mdio_read;
2586 	adapter->mii.mdio_write = atl1c_mdio_write;
2587 	adapter->mii.phy_id_mask = 0x1f;
2588 	adapter->mii.reg_num_mask = MDIO_CTRL_REG_MASK;
2589 	netif_napi_add(netdev, &adapter->napi, atl1c_clean, 64);
2590 	timer_setup(&adapter->phy_config_timer, atl1c_phy_config, 0);
2591 	/* setup the private structure */
2592 	err = atl1c_sw_init(adapter);
2593 	if (err) {
2594 		dev_err(&pdev->dev, "net device private data init failed\n");
2595 		goto err_sw_init;
2596 	}
2597 	/* set max MTU */
2598 	atl1c_set_max_mtu(netdev);
2599 
2600 	atl1c_reset_pcie(&adapter->hw, ATL1C_PCIE_L0S_L1_DISABLE);
2601 
2602 	/* Init GPHY as early as possible due to power saving issue  */
2603 	atl1c_phy_reset(&adapter->hw);
2604 
2605 	err = atl1c_reset_mac(&adapter->hw);
2606 	if (err) {
2607 		err = -EIO;
2608 		goto err_reset;
2609 	}
2610 
2611 	/* reset the controller to
2612 	 * put the device in a known good starting state */
2613 	err = atl1c_phy_init(&adapter->hw);
2614 	if (err) {
2615 		err = -EIO;
2616 		goto err_reset;
2617 	}
2618 	if (atl1c_read_mac_addr(&adapter->hw)) {
2619 		/* got a random MAC address, set NET_ADDR_RANDOM to netdev */
2620 		netdev->addr_assign_type = NET_ADDR_RANDOM;
2621 	}
2622 	memcpy(netdev->dev_addr, adapter->hw.mac_addr, netdev->addr_len);
2623 	if (netif_msg_probe(adapter))
2624 		dev_dbg(&pdev->dev, "mac address : %pM\n",
2625 			adapter->hw.mac_addr);
2626 
2627 	atl1c_hw_set_mac_addr(&adapter->hw, adapter->hw.mac_addr);
2628 	INIT_WORK(&adapter->common_task, atl1c_common_task);
2629 	adapter->work_event = 0;
2630 	err = register_netdev(netdev);
2631 	if (err) {
2632 		dev_err(&pdev->dev, "register netdevice failed\n");
2633 		goto err_register;
2634 	}
2635 
2636 	cards_found++;
2637 	return 0;
2638 
2639 err_reset:
2640 err_register:
2641 err_sw_init:
2642 	iounmap(adapter->hw.hw_addr);
2643 err_init_netdev:
2644 err_ioremap:
2645 	free_netdev(netdev);
2646 err_alloc_etherdev:
2647 	pci_release_regions(pdev);
2648 err_pci_reg:
2649 err_dma:
2650 	pci_disable_device(pdev);
2651 	return err;
2652 }
2653 
2654 /**
2655  * atl1c_remove - Device Removal Routine
2656  * @pdev: PCI device information struct
2657  *
2658  * atl1c_remove is called by the PCI subsystem to alert the driver
2659  * that it should release a PCI device.  The could be caused by a
2660  * Hot-Plug event, or because the driver is going to be removed from
2661  * memory.
2662  */
2663 static void atl1c_remove(struct pci_dev *pdev)
2664 {
2665 	struct net_device *netdev = pci_get_drvdata(pdev);
2666 	struct atl1c_adapter *adapter = netdev_priv(netdev);
2667 
2668 	unregister_netdev(netdev);
2669 	/* restore permanent address */
2670 	atl1c_hw_set_mac_addr(&adapter->hw, adapter->hw.perm_mac_addr);
2671 	atl1c_phy_disable(&adapter->hw);
2672 
2673 	iounmap(adapter->hw.hw_addr);
2674 
2675 	pci_release_regions(pdev);
2676 	pci_disable_device(pdev);
2677 	free_netdev(netdev);
2678 }
2679 
2680 /**
2681  * atl1c_io_error_detected - called when PCI error is detected
2682  * @pdev: Pointer to PCI device
2683  * @state: The current pci connection state
2684  *
2685  * This function is called after a PCI bus error affecting
2686  * this device has been detected.
2687  */
2688 static pci_ers_result_t atl1c_io_error_detected(struct pci_dev *pdev,
2689 						pci_channel_state_t state)
2690 {
2691 	struct net_device *netdev = pci_get_drvdata(pdev);
2692 	struct atl1c_adapter *adapter = netdev_priv(netdev);
2693 
2694 	netif_device_detach(netdev);
2695 
2696 	if (state == pci_channel_io_perm_failure)
2697 		return PCI_ERS_RESULT_DISCONNECT;
2698 
2699 	if (netif_running(netdev))
2700 		atl1c_down(adapter);
2701 
2702 	pci_disable_device(pdev);
2703 
2704 	/* Request a slot slot reset. */
2705 	return PCI_ERS_RESULT_NEED_RESET;
2706 }
2707 
2708 /**
2709  * atl1c_io_slot_reset - called after the pci bus has been reset.
2710  * @pdev: Pointer to PCI device
2711  *
2712  * Restart the card from scratch, as if from a cold-boot. Implementation
2713  * resembles the first-half of the e1000_resume routine.
2714  */
2715 static pci_ers_result_t atl1c_io_slot_reset(struct pci_dev *pdev)
2716 {
2717 	struct net_device *netdev = pci_get_drvdata(pdev);
2718 	struct atl1c_adapter *adapter = netdev_priv(netdev);
2719 
2720 	if (pci_enable_device(pdev)) {
2721 		if (netif_msg_hw(adapter))
2722 			dev_err(&pdev->dev,
2723 				"Cannot re-enable PCI device after reset\n");
2724 		return PCI_ERS_RESULT_DISCONNECT;
2725 	}
2726 	pci_set_master(pdev);
2727 
2728 	pci_enable_wake(pdev, PCI_D3hot, 0);
2729 	pci_enable_wake(pdev, PCI_D3cold, 0);
2730 
2731 	atl1c_reset_mac(&adapter->hw);
2732 
2733 	return PCI_ERS_RESULT_RECOVERED;
2734 }
2735 
2736 /**
2737  * atl1c_io_resume - called when traffic can start flowing again.
2738  * @pdev: Pointer to PCI device
2739  *
2740  * This callback is called when the error recovery driver tells us that
2741  * its OK to resume normal operation. Implementation resembles the
2742  * second-half of the atl1c_resume routine.
2743  */
2744 static void atl1c_io_resume(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 (netif_running(netdev)) {
2750 		if (atl1c_up(adapter)) {
2751 			if (netif_msg_hw(adapter))
2752 				dev_err(&pdev->dev,
2753 					"Cannot bring device back up after reset\n");
2754 			return;
2755 		}
2756 	}
2757 
2758 	netif_device_attach(netdev);
2759 }
2760 
2761 static const struct pci_error_handlers atl1c_err_handler = {
2762 	.error_detected = atl1c_io_error_detected,
2763 	.slot_reset = atl1c_io_slot_reset,
2764 	.resume = atl1c_io_resume,
2765 };
2766 
2767 static SIMPLE_DEV_PM_OPS(atl1c_pm_ops, atl1c_suspend, atl1c_resume);
2768 
2769 static struct pci_driver atl1c_driver = {
2770 	.name     = atl1c_driver_name,
2771 	.id_table = atl1c_pci_tbl,
2772 	.probe    = atl1c_probe,
2773 	.remove   = atl1c_remove,
2774 	.shutdown = atl1c_shutdown,
2775 	.err_handler = &atl1c_err_handler,
2776 	.driver.pm = &atl1c_pm_ops,
2777 };
2778 
2779 module_pci_driver(atl1c_driver);
2780