xref: /linux/drivers/net/ethernet/atheros/atl1c/atl1c_main.c (revision 4413e16d9d21673bb5048a2e542f1aaa00015c2e)
1 /*
2  * Copyright(c) 2008 - 2009 Atheros Corporation. All rights reserved.
3  *
4  * Derived from Intel e1000 driver
5  * Copyright(c) 1999 - 2005 Intel Corporation. All rights reserved.
6  *
7  * This program is free software; you can redistribute it and/or modify it
8  * under the terms of the GNU General Public License as published by the Free
9  * Software Foundation; either version 2 of the License, or (at your option)
10  * any later version.
11  *
12  * This program is distributed in the hope that it will be useful, but WITHOUT
13  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
14  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
15  * more details.
16  *
17  * You should have received a copy of the GNU General Public License along with
18  * this program; if not, write to the Free Software Foundation, Inc., 59
19  * Temple Place - Suite 330, Boston, MA  02111-1307, USA.
20  */
21 
22 #include "atl1c.h"
23 
24 #define ATL1C_DRV_VERSION "1.0.1.0-NAPI"
25 char atl1c_driver_name[] = "atl1c";
26 char atl1c_driver_version[] = ATL1C_DRV_VERSION;
27 
28 /*
29  * atl1c_pci_tbl - PCI Device ID Table
30  *
31  * Wildcard entries (PCI_ANY_ID) should come last
32  * Last entry must be all 0s
33  *
34  * { Vendor ID, Device ID, SubVendor ID, SubDevice ID,
35  *   Class, Class Mask, private data (not used) }
36  */
37 static DEFINE_PCI_DEVICE_TABLE(atl1c_pci_tbl) = {
38 	{PCI_DEVICE(PCI_VENDOR_ID_ATTANSIC, PCI_DEVICE_ID_ATTANSIC_L1C)},
39 	{PCI_DEVICE(PCI_VENDOR_ID_ATTANSIC, PCI_DEVICE_ID_ATTANSIC_L2C)},
40 	{PCI_DEVICE(PCI_VENDOR_ID_ATTANSIC, PCI_DEVICE_ID_ATHEROS_L2C_B)},
41 	{PCI_DEVICE(PCI_VENDOR_ID_ATTANSIC, PCI_DEVICE_ID_ATHEROS_L2C_B2)},
42 	{PCI_DEVICE(PCI_VENDOR_ID_ATTANSIC, PCI_DEVICE_ID_ATHEROS_L1D)},
43 	{PCI_DEVICE(PCI_VENDOR_ID_ATTANSIC, PCI_DEVICE_ID_ATHEROS_L1D_2_0)},
44 	/* required last entry */
45 	{ 0 }
46 };
47 MODULE_DEVICE_TABLE(pci, atl1c_pci_tbl);
48 
49 MODULE_AUTHOR("Jie Yang");
50 MODULE_AUTHOR("Qualcomm Atheros Inc., <nic-devel@qualcomm.com>");
51 MODULE_DESCRIPTION("Qualcom Atheros 100/1000M Ethernet Network Driver");
52 MODULE_LICENSE("GPL");
53 MODULE_VERSION(ATL1C_DRV_VERSION);
54 
55 static int atl1c_stop_mac(struct atl1c_hw *hw);
56 static void atl1c_disable_l0s_l1(struct atl1c_hw *hw);
57 static void atl1c_set_aspm(struct atl1c_hw *hw, u16 link_speed);
58 static void atl1c_start_mac(struct atl1c_adapter *adapter);
59 static void atl1c_clean_rx_irq(struct atl1c_adapter *adapter,
60 		   int *work_done, int work_to_do);
61 static int atl1c_up(struct atl1c_adapter *adapter);
62 static void atl1c_down(struct atl1c_adapter *adapter);
63 static int atl1c_reset_mac(struct atl1c_hw *hw);
64 static void atl1c_reset_dma_ring(struct atl1c_adapter *adapter);
65 static int atl1c_configure(struct atl1c_adapter *adapter);
66 static int atl1c_alloc_rx_buffer(struct atl1c_adapter *adapter);
67 
68 static const u16 atl1c_pay_load_size[] = {
69 	128, 256, 512, 1024, 2048, 4096,
70 };
71 
72 
73 static const u32 atl1c_default_msg = NETIF_MSG_DRV | NETIF_MSG_PROBE |
74 	NETIF_MSG_LINK | NETIF_MSG_TIMER | NETIF_MSG_IFDOWN | NETIF_MSG_IFUP;
75 static void atl1c_pcie_patch(struct atl1c_hw *hw)
76 {
77 	u32 mst_data, data;
78 
79 	/* pclk sel could switch to 25M */
80 	AT_READ_REG(hw, REG_MASTER_CTRL, &mst_data);
81 	mst_data &= ~MASTER_CTRL_CLK_SEL_DIS;
82 	AT_WRITE_REG(hw, REG_MASTER_CTRL, mst_data);
83 
84 	/* WoL/PCIE related settings */
85 	if (hw->nic_type == athr_l1c || hw->nic_type == athr_l2c) {
86 		AT_READ_REG(hw, REG_PCIE_PHYMISC, &data);
87 		data |= PCIE_PHYMISC_FORCE_RCV_DET;
88 		AT_WRITE_REG(hw, REG_PCIE_PHYMISC, data);
89 	} else { /* new dev set bit5 of MASTER */
90 		if (!(mst_data & MASTER_CTRL_WAKEN_25M))
91 			AT_WRITE_REG(hw, REG_MASTER_CTRL,
92 				mst_data | MASTER_CTRL_WAKEN_25M);
93 	}
94 	/* aspm/PCIE setting only for l2cb 1.0 */
95 	if (hw->nic_type == athr_l2c_b && hw->revision_id == L2CB_V10) {
96 		AT_READ_REG(hw, REG_PCIE_PHYMISC2, &data);
97 		data = FIELD_SETX(data, PCIE_PHYMISC2_CDR_BW,
98 			L2CB1_PCIE_PHYMISC2_CDR_BW);
99 		data = FIELD_SETX(data, PCIE_PHYMISC2_L0S_TH,
100 			L2CB1_PCIE_PHYMISC2_L0S_TH);
101 		AT_WRITE_REG(hw, REG_PCIE_PHYMISC2, data);
102 		/* extend L1 sync timer */
103 		AT_READ_REG(hw, REG_LINK_CTRL, &data);
104 		data |= LINK_CTRL_EXT_SYNC;
105 		AT_WRITE_REG(hw, REG_LINK_CTRL, data);
106 	}
107 	/* l2cb 1.x & l1d 1.x */
108 	if (hw->nic_type == athr_l2c_b || hw->nic_type == athr_l1d) {
109 		AT_READ_REG(hw, REG_PM_CTRL, &data);
110 		data |= PM_CTRL_L0S_BUFSRX_EN;
111 		AT_WRITE_REG(hw, REG_PM_CTRL, data);
112 		/* clear vendor msg */
113 		AT_READ_REG(hw, REG_DMA_DBG, &data);
114 		AT_WRITE_REG(hw, REG_DMA_DBG, data & ~DMA_DBG_VENDOR_MSG);
115 	}
116 }
117 
118 /* FIXME: no need any more ? */
119 /*
120  * atl1c_init_pcie - init PCIE module
121  */
122 static void atl1c_reset_pcie(struct atl1c_hw *hw, u32 flag)
123 {
124 	u32 data;
125 	u32 pci_cmd;
126 	struct pci_dev *pdev = hw->adapter->pdev;
127 	int pos;
128 
129 	AT_READ_REG(hw, PCI_COMMAND, &pci_cmd);
130 	pci_cmd &= ~PCI_COMMAND_INTX_DISABLE;
131 	pci_cmd |= (PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER |
132 		PCI_COMMAND_IO);
133 	AT_WRITE_REG(hw, PCI_COMMAND, pci_cmd);
134 
135 	/*
136 	 * Clear any PowerSaveing Settings
137 	 */
138 	pci_enable_wake(pdev, PCI_D3hot, 0);
139 	pci_enable_wake(pdev, PCI_D3cold, 0);
140 	/* wol sts read-clear */
141 	AT_READ_REG(hw, REG_WOL_CTRL, &data);
142 	AT_WRITE_REG(hw, REG_WOL_CTRL, 0);
143 
144 	/*
145 	 * Mask some pcie error bits
146 	 */
147 	pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_ERR);
148 	pci_read_config_dword(pdev, pos + PCI_ERR_UNCOR_SEVER, &data);
149 	data &= ~(PCI_ERR_UNC_DLP | PCI_ERR_UNC_FCP);
150 	pci_write_config_dword(pdev, pos + PCI_ERR_UNCOR_SEVER, data);
151 	/* clear error status */
152 	pcie_capability_write_word(pdev, PCI_EXP_DEVSTA,
153 			PCI_EXP_DEVSTA_NFED |
154 			PCI_EXP_DEVSTA_FED |
155 			PCI_EXP_DEVSTA_CED |
156 			PCI_EXP_DEVSTA_URD);
157 
158 	AT_READ_REG(hw, REG_LTSSM_ID_CTRL, &data);
159 	data &= ~LTSSM_ID_EN_WRO;
160 	AT_WRITE_REG(hw, REG_LTSSM_ID_CTRL, data);
161 
162 	atl1c_pcie_patch(hw);
163 	if (flag & ATL1C_PCIE_L0S_L1_DISABLE)
164 		atl1c_disable_l0s_l1(hw);
165 
166 	msleep(5);
167 }
168 
169 /**
170  * atl1c_irq_enable - Enable default interrupt generation settings
171  * @adapter: board private structure
172  */
173 static inline void atl1c_irq_enable(struct atl1c_adapter *adapter)
174 {
175 	if (likely(atomic_dec_and_test(&adapter->irq_sem))) {
176 		AT_WRITE_REG(&adapter->hw, REG_ISR, 0x7FFFFFFF);
177 		AT_WRITE_REG(&adapter->hw, REG_IMR, adapter->hw.intr_mask);
178 		AT_WRITE_FLUSH(&adapter->hw);
179 	}
180 }
181 
182 /**
183  * atl1c_irq_disable - Mask off interrupt generation on the NIC
184  * @adapter: board private structure
185  */
186 static inline void atl1c_irq_disable(struct atl1c_adapter *adapter)
187 {
188 	atomic_inc(&adapter->irq_sem);
189 	AT_WRITE_REG(&adapter->hw, REG_IMR, 0);
190 	AT_WRITE_REG(&adapter->hw, REG_ISR, ISR_DIS_INT);
191 	AT_WRITE_FLUSH(&adapter->hw);
192 	synchronize_irq(adapter->pdev->irq);
193 }
194 
195 /**
196  * atl1c_irq_reset - reset interrupt confiure on the NIC
197  * @adapter: board private structure
198  */
199 static inline void atl1c_irq_reset(struct atl1c_adapter *adapter)
200 {
201 	atomic_set(&adapter->irq_sem, 1);
202 	atl1c_irq_enable(adapter);
203 }
204 
205 /*
206  * atl1c_wait_until_idle - wait up to AT_HW_MAX_IDLE_DELAY reads
207  * of the idle status register until the device is actually idle
208  */
209 static u32 atl1c_wait_until_idle(struct atl1c_hw *hw, u32 modu_ctrl)
210 {
211 	int timeout;
212 	u32 data;
213 
214 	for (timeout = 0; timeout < AT_HW_MAX_IDLE_DELAY; timeout++) {
215 		AT_READ_REG(hw, REG_IDLE_STATUS, &data);
216 		if ((data & modu_ctrl) == 0)
217 			return 0;
218 		msleep(1);
219 	}
220 	return data;
221 }
222 
223 /**
224  * atl1c_phy_config - Timer Call-back
225  * @data: pointer to netdev cast into an unsigned long
226  */
227 static void atl1c_phy_config(unsigned long data)
228 {
229 	struct atl1c_adapter *adapter = (struct atl1c_adapter *) data;
230 	struct atl1c_hw *hw = &adapter->hw;
231 	unsigned long flags;
232 
233 	spin_lock_irqsave(&adapter->mdio_lock, flags);
234 	atl1c_restart_autoneg(hw);
235 	spin_unlock_irqrestore(&adapter->mdio_lock, flags);
236 }
237 
238 void atl1c_reinit_locked(struct atl1c_adapter *adapter)
239 {
240 	WARN_ON(in_interrupt());
241 	atl1c_down(adapter);
242 	atl1c_up(adapter);
243 	clear_bit(__AT_RESETTING, &adapter->flags);
244 }
245 
246 static void atl1c_check_link_status(struct atl1c_adapter *adapter)
247 {
248 	struct atl1c_hw *hw = &adapter->hw;
249 	struct net_device *netdev = adapter->netdev;
250 	struct pci_dev    *pdev   = adapter->pdev;
251 	int err;
252 	unsigned long flags;
253 	u16 speed, duplex, phy_data;
254 
255 	spin_lock_irqsave(&adapter->mdio_lock, flags);
256 	/* MII_BMSR must read twise */
257 	atl1c_read_phy_reg(hw, MII_BMSR, &phy_data);
258 	atl1c_read_phy_reg(hw, MII_BMSR, &phy_data);
259 	spin_unlock_irqrestore(&adapter->mdio_lock, flags);
260 
261 	if ((phy_data & BMSR_LSTATUS) == 0) {
262 		/* link down */
263 		netif_carrier_off(netdev);
264 		hw->hibernate = true;
265 		if (atl1c_reset_mac(hw) != 0)
266 			if (netif_msg_hw(adapter))
267 				dev_warn(&pdev->dev, "reset mac failed\n");
268 		atl1c_set_aspm(hw, SPEED_0);
269 		atl1c_post_phy_linkchg(hw, SPEED_0);
270 		atl1c_reset_dma_ring(adapter);
271 		atl1c_configure(adapter);
272 	} else {
273 		/* Link Up */
274 		hw->hibernate = false;
275 		spin_lock_irqsave(&adapter->mdio_lock, flags);
276 		err = atl1c_get_speed_and_duplex(hw, &speed, &duplex);
277 		spin_unlock_irqrestore(&adapter->mdio_lock, flags);
278 		if (unlikely(err))
279 			return;
280 		/* link result is our setting */
281 		if (adapter->link_speed != speed ||
282 		    adapter->link_duplex != duplex) {
283 			adapter->link_speed  = speed;
284 			adapter->link_duplex = duplex;
285 			atl1c_set_aspm(hw, speed);
286 			atl1c_post_phy_linkchg(hw, speed);
287 			atl1c_start_mac(adapter);
288 			if (netif_msg_link(adapter))
289 				dev_info(&pdev->dev,
290 					"%s: %s NIC Link is Up<%d Mbps %s>\n",
291 					atl1c_driver_name, netdev->name,
292 					adapter->link_speed,
293 					adapter->link_duplex == FULL_DUPLEX ?
294 					"Full Duplex" : "Half Duplex");
295 		}
296 		if (!netif_carrier_ok(netdev))
297 			netif_carrier_on(netdev);
298 	}
299 }
300 
301 static void atl1c_link_chg_event(struct atl1c_adapter *adapter)
302 {
303 	struct net_device *netdev = adapter->netdev;
304 	struct pci_dev    *pdev   = adapter->pdev;
305 	u16 phy_data;
306 	u16 link_up;
307 
308 	spin_lock(&adapter->mdio_lock);
309 	atl1c_read_phy_reg(&adapter->hw, MII_BMSR, &phy_data);
310 	atl1c_read_phy_reg(&adapter->hw, MII_BMSR, &phy_data);
311 	spin_unlock(&adapter->mdio_lock);
312 	link_up = phy_data & BMSR_LSTATUS;
313 	/* notify upper layer link down ASAP */
314 	if (!link_up) {
315 		if (netif_carrier_ok(netdev)) {
316 			/* old link state: Up */
317 			netif_carrier_off(netdev);
318 			if (netif_msg_link(adapter))
319 				dev_info(&pdev->dev,
320 					"%s: %s NIC Link is Down\n",
321 					atl1c_driver_name, netdev->name);
322 			adapter->link_speed = SPEED_0;
323 		}
324 	}
325 
326 	set_bit(ATL1C_WORK_EVENT_LINK_CHANGE, &adapter->work_event);
327 	schedule_work(&adapter->common_task);
328 }
329 
330 static void atl1c_common_task(struct work_struct *work)
331 {
332 	struct atl1c_adapter *adapter;
333 	struct net_device *netdev;
334 
335 	adapter = container_of(work, struct atl1c_adapter, common_task);
336 	netdev = adapter->netdev;
337 
338 	if (test_bit(__AT_DOWN, &adapter->flags))
339 		return;
340 
341 	if (test_and_clear_bit(ATL1C_WORK_EVENT_RESET, &adapter->work_event)) {
342 		netif_device_detach(netdev);
343 		atl1c_down(adapter);
344 		atl1c_up(adapter);
345 		netif_device_attach(netdev);
346 	}
347 
348 	if (test_and_clear_bit(ATL1C_WORK_EVENT_LINK_CHANGE,
349 		&adapter->work_event)) {
350 		atl1c_irq_disable(adapter);
351 		atl1c_check_link_status(adapter);
352 		atl1c_irq_enable(adapter);
353 	}
354 }
355 
356 
357 static void atl1c_del_timer(struct atl1c_adapter *adapter)
358 {
359 	del_timer_sync(&adapter->phy_config_timer);
360 }
361 
362 
363 /**
364  * atl1c_tx_timeout - Respond to a Tx Hang
365  * @netdev: network interface device structure
366  */
367 static void atl1c_tx_timeout(struct net_device *netdev)
368 {
369 	struct atl1c_adapter *adapter = netdev_priv(netdev);
370 
371 	/* Do the reset outside of interrupt context */
372 	set_bit(ATL1C_WORK_EVENT_RESET, &adapter->work_event);
373 	schedule_work(&adapter->common_task);
374 }
375 
376 /**
377  * atl1c_set_multi - Multicast and Promiscuous mode set
378  * @netdev: network interface device structure
379  *
380  * The set_multi entry point is called whenever the multicast address
381  * list or the network interface flags are updated.  This routine is
382  * responsible for configuring the hardware for proper multicast,
383  * promiscuous mode, and all-multi behavior.
384  */
385 static void atl1c_set_multi(struct net_device *netdev)
386 {
387 	struct atl1c_adapter *adapter = netdev_priv(netdev);
388 	struct atl1c_hw *hw = &adapter->hw;
389 	struct netdev_hw_addr *ha;
390 	u32 mac_ctrl_data;
391 	u32 hash_value;
392 
393 	/* Check for Promiscuous and All Multicast modes */
394 	AT_READ_REG(hw, REG_MAC_CTRL, &mac_ctrl_data);
395 
396 	if (netdev->flags & IFF_PROMISC) {
397 		mac_ctrl_data |= MAC_CTRL_PROMIS_EN;
398 	} else if (netdev->flags & IFF_ALLMULTI) {
399 		mac_ctrl_data |= MAC_CTRL_MC_ALL_EN;
400 		mac_ctrl_data &= ~MAC_CTRL_PROMIS_EN;
401 	} else {
402 		mac_ctrl_data &= ~(MAC_CTRL_PROMIS_EN | MAC_CTRL_MC_ALL_EN);
403 	}
404 
405 	AT_WRITE_REG(hw, REG_MAC_CTRL, mac_ctrl_data);
406 
407 	/* clear the old settings from the multicast hash table */
408 	AT_WRITE_REG(hw, REG_RX_HASH_TABLE, 0);
409 	AT_WRITE_REG_ARRAY(hw, REG_RX_HASH_TABLE, 1, 0);
410 
411 	/* comoute mc addresses' hash value ,and put it into hash table */
412 	netdev_for_each_mc_addr(ha, netdev) {
413 		hash_value = atl1c_hash_mc_addr(hw, ha->addr);
414 		atl1c_hash_set(hw, hash_value);
415 	}
416 }
417 
418 static void __atl1c_vlan_mode(netdev_features_t features, u32 *mac_ctrl_data)
419 {
420 	if (features & NETIF_F_HW_VLAN_RX) {
421 		/* enable VLAN tag insert/strip */
422 		*mac_ctrl_data |= MAC_CTRL_RMV_VLAN;
423 	} else {
424 		/* disable VLAN tag insert/strip */
425 		*mac_ctrl_data &= ~MAC_CTRL_RMV_VLAN;
426 	}
427 }
428 
429 static void atl1c_vlan_mode(struct net_device *netdev,
430 	netdev_features_t features)
431 {
432 	struct atl1c_adapter *adapter = netdev_priv(netdev);
433 	struct pci_dev *pdev = adapter->pdev;
434 	u32 mac_ctrl_data = 0;
435 
436 	if (netif_msg_pktdata(adapter))
437 		dev_dbg(&pdev->dev, "atl1c_vlan_mode\n");
438 
439 	atl1c_irq_disable(adapter);
440 	AT_READ_REG(&adapter->hw, REG_MAC_CTRL, &mac_ctrl_data);
441 	__atl1c_vlan_mode(features, &mac_ctrl_data);
442 	AT_WRITE_REG(&adapter->hw, REG_MAC_CTRL, mac_ctrl_data);
443 	atl1c_irq_enable(adapter);
444 }
445 
446 static void atl1c_restore_vlan(struct atl1c_adapter *adapter)
447 {
448 	struct pci_dev *pdev = adapter->pdev;
449 
450 	if (netif_msg_pktdata(adapter))
451 		dev_dbg(&pdev->dev, "atl1c_restore_vlan\n");
452 	atl1c_vlan_mode(adapter->netdev, adapter->netdev->features);
453 }
454 
455 /**
456  * atl1c_set_mac - Change the Ethernet Address of the NIC
457  * @netdev: network interface device structure
458  * @p: pointer to an address structure
459  *
460  * Returns 0 on success, negative on failure
461  */
462 static int atl1c_set_mac_addr(struct net_device *netdev, void *p)
463 {
464 	struct atl1c_adapter *adapter = netdev_priv(netdev);
465 	struct sockaddr *addr = p;
466 
467 	if (!is_valid_ether_addr(addr->sa_data))
468 		return -EADDRNOTAVAIL;
469 
470 	if (netif_running(netdev))
471 		return -EBUSY;
472 
473 	memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
474 	memcpy(adapter->hw.mac_addr, addr->sa_data, netdev->addr_len);
475 	netdev->addr_assign_type &= ~NET_ADDR_RANDOM;
476 
477 	atl1c_hw_set_mac_addr(&adapter->hw, adapter->hw.mac_addr);
478 
479 	return 0;
480 }
481 
482 static void atl1c_set_rxbufsize(struct atl1c_adapter *adapter,
483 				struct net_device *dev)
484 {
485 	int mtu = dev->mtu;
486 
487 	adapter->rx_buffer_len = mtu > AT_RX_BUF_SIZE ?
488 		roundup(mtu + ETH_HLEN + ETH_FCS_LEN + VLAN_HLEN, 8) : AT_RX_BUF_SIZE;
489 }
490 
491 static netdev_features_t atl1c_fix_features(struct net_device *netdev,
492 	netdev_features_t features)
493 {
494 	/*
495 	 * Since there is no support for separate rx/tx vlan accel
496 	 * enable/disable make sure tx flag is always in same state as rx.
497 	 */
498 	if (features & NETIF_F_HW_VLAN_RX)
499 		features |= NETIF_F_HW_VLAN_TX;
500 	else
501 		features &= ~NETIF_F_HW_VLAN_TX;
502 
503 	if (netdev->mtu > MAX_TSO_FRAME_SIZE)
504 		features &= ~(NETIF_F_TSO | NETIF_F_TSO6);
505 
506 	return features;
507 }
508 
509 static int atl1c_set_features(struct net_device *netdev,
510 	netdev_features_t features)
511 {
512 	netdev_features_t changed = netdev->features ^ features;
513 
514 	if (changed & NETIF_F_HW_VLAN_RX)
515 		atl1c_vlan_mode(netdev, features);
516 
517 	return 0;
518 }
519 
520 /**
521  * atl1c_change_mtu - Change the Maximum Transfer Unit
522  * @netdev: network interface device structure
523  * @new_mtu: new value for maximum frame size
524  *
525  * Returns 0 on success, negative on failure
526  */
527 static int atl1c_change_mtu(struct net_device *netdev, int new_mtu)
528 {
529 	struct atl1c_adapter *adapter = netdev_priv(netdev);
530 	struct atl1c_hw *hw = &adapter->hw;
531 	int old_mtu   = netdev->mtu;
532 	int max_frame = new_mtu + ETH_HLEN + ETH_FCS_LEN + VLAN_HLEN;
533 
534 	/* Fast Ethernet controller doesn't support jumbo packet */
535 	if (((hw->nic_type == athr_l2c ||
536 	      hw->nic_type == athr_l2c_b ||
537 	      hw->nic_type == athr_l2c_b2) && new_mtu > ETH_DATA_LEN) ||
538 	      max_frame < ETH_ZLEN + ETH_FCS_LEN ||
539 	      max_frame > MAX_JUMBO_FRAME_SIZE) {
540 		if (netif_msg_link(adapter))
541 			dev_warn(&adapter->pdev->dev, "invalid MTU setting\n");
542 		return -EINVAL;
543 	}
544 	/* set MTU */
545 	if (old_mtu != new_mtu && netif_running(netdev)) {
546 		while (test_and_set_bit(__AT_RESETTING, &adapter->flags))
547 			msleep(1);
548 		netdev->mtu = new_mtu;
549 		adapter->hw.max_frame_size = new_mtu;
550 		atl1c_set_rxbufsize(adapter, netdev);
551 		atl1c_down(adapter);
552 		netdev_update_features(netdev);
553 		atl1c_up(adapter);
554 		clear_bit(__AT_RESETTING, &adapter->flags);
555 	}
556 	return 0;
557 }
558 
559 /*
560  *  caller should hold mdio_lock
561  */
562 static int atl1c_mdio_read(struct net_device *netdev, int phy_id, int reg_num)
563 {
564 	struct atl1c_adapter *adapter = netdev_priv(netdev);
565 	u16 result;
566 
567 	atl1c_read_phy_reg(&adapter->hw, reg_num, &result);
568 	return result;
569 }
570 
571 static void atl1c_mdio_write(struct net_device *netdev, int phy_id,
572 			     int reg_num, int val)
573 {
574 	struct atl1c_adapter *adapter = netdev_priv(netdev);
575 
576 	atl1c_write_phy_reg(&adapter->hw, reg_num, val);
577 }
578 
579 static int atl1c_mii_ioctl(struct net_device *netdev,
580 			   struct ifreq *ifr, int cmd)
581 {
582 	struct atl1c_adapter *adapter = netdev_priv(netdev);
583 	struct pci_dev *pdev = adapter->pdev;
584 	struct mii_ioctl_data *data = if_mii(ifr);
585 	unsigned long flags;
586 	int retval = 0;
587 
588 	if (!netif_running(netdev))
589 		return -EINVAL;
590 
591 	spin_lock_irqsave(&adapter->mdio_lock, flags);
592 	switch (cmd) {
593 	case SIOCGMIIPHY:
594 		data->phy_id = 0;
595 		break;
596 
597 	case SIOCGMIIREG:
598 		if (atl1c_read_phy_reg(&adapter->hw, data->reg_num & 0x1F,
599 				    &data->val_out)) {
600 			retval = -EIO;
601 			goto out;
602 		}
603 		break;
604 
605 	case SIOCSMIIREG:
606 		if (data->reg_num & ~(0x1F)) {
607 			retval = -EFAULT;
608 			goto out;
609 		}
610 
611 		dev_dbg(&pdev->dev, "<atl1c_mii_ioctl> write %x %x",
612 				data->reg_num, data->val_in);
613 		if (atl1c_write_phy_reg(&adapter->hw,
614 				     data->reg_num, data->val_in)) {
615 			retval = -EIO;
616 			goto out;
617 		}
618 		break;
619 
620 	default:
621 		retval = -EOPNOTSUPP;
622 		break;
623 	}
624 out:
625 	spin_unlock_irqrestore(&adapter->mdio_lock, flags);
626 	return retval;
627 }
628 
629 static int atl1c_ioctl(struct net_device *netdev, struct ifreq *ifr, int cmd)
630 {
631 	switch (cmd) {
632 	case SIOCGMIIPHY:
633 	case SIOCGMIIREG:
634 	case SIOCSMIIREG:
635 		return atl1c_mii_ioctl(netdev, ifr, cmd);
636 	default:
637 		return -EOPNOTSUPP;
638 	}
639 }
640 
641 /**
642  * atl1c_alloc_queues - Allocate memory for all rings
643  * @adapter: board private structure to initialize
644  *
645  */
646 static int __devinit atl1c_alloc_queues(struct atl1c_adapter *adapter)
647 {
648 	return 0;
649 }
650 
651 static void atl1c_set_mac_type(struct atl1c_hw *hw)
652 {
653 	switch (hw->device_id) {
654 	case PCI_DEVICE_ID_ATTANSIC_L2C:
655 		hw->nic_type = athr_l2c;
656 		break;
657 	case PCI_DEVICE_ID_ATTANSIC_L1C:
658 		hw->nic_type = athr_l1c;
659 		break;
660 	case PCI_DEVICE_ID_ATHEROS_L2C_B:
661 		hw->nic_type = athr_l2c_b;
662 		break;
663 	case PCI_DEVICE_ID_ATHEROS_L2C_B2:
664 		hw->nic_type = athr_l2c_b2;
665 		break;
666 	case PCI_DEVICE_ID_ATHEROS_L1D:
667 		hw->nic_type = athr_l1d;
668 		break;
669 	case PCI_DEVICE_ID_ATHEROS_L1D_2_0:
670 		hw->nic_type = athr_l1d_2;
671 		break;
672 	default:
673 		break;
674 	}
675 }
676 
677 static int atl1c_setup_mac_funcs(struct atl1c_hw *hw)
678 {
679 	u32 link_ctrl_data;
680 
681 	atl1c_set_mac_type(hw);
682 	AT_READ_REG(hw, REG_LINK_CTRL, &link_ctrl_data);
683 
684 	hw->ctrl_flags = ATL1C_INTR_MODRT_ENABLE  |
685 			 ATL1C_TXQ_MODE_ENHANCE;
686 	hw->ctrl_flags |= ATL1C_ASPM_L0S_SUPPORT |
687 			  ATL1C_ASPM_L1_SUPPORT;
688 	hw->ctrl_flags |= ATL1C_ASPM_CTRL_MON;
689 
690 	if (hw->nic_type == athr_l1c ||
691 	    hw->nic_type == athr_l1d ||
692 	    hw->nic_type == athr_l1d_2)
693 		hw->link_cap_flags |= ATL1C_LINK_CAP_1000M;
694 	return 0;
695 }
696 
697 struct atl1c_platform_patch {
698 	u16 pci_did;
699 	u8  pci_revid;
700 	u16 subsystem_vid;
701 	u16 subsystem_did;
702 	u32 patch_flag;
703 #define ATL1C_LINK_PATCH	0x1
704 };
705 static const struct atl1c_platform_patch plats[] __devinitdata = {
706 {0x2060, 0xC1, 0x1019, 0x8152, 0x1},
707 {0x2060, 0xC1, 0x1019, 0x2060, 0x1},
708 {0x2060, 0xC1, 0x1019, 0xE000, 0x1},
709 {0x2062, 0xC0, 0x1019, 0x8152, 0x1},
710 {0x2062, 0xC0, 0x1019, 0x2062, 0x1},
711 {0x2062, 0xC0, 0x1458, 0xE000, 0x1},
712 {0x2062, 0xC1, 0x1019, 0x8152, 0x1},
713 {0x2062, 0xC1, 0x1019, 0x2062, 0x1},
714 {0x2062, 0xC1, 0x1458, 0xE000, 0x1},
715 {0x2062, 0xC1, 0x1565, 0x2802, 0x1},
716 {0x2062, 0xC1, 0x1565, 0x2801, 0x1},
717 {0x1073, 0xC0, 0x1019, 0x8151, 0x1},
718 {0x1073, 0xC0, 0x1019, 0x1073, 0x1},
719 {0x1073, 0xC0, 0x1458, 0xE000, 0x1},
720 {0x1083, 0xC0, 0x1458, 0xE000, 0x1},
721 {0x1083, 0xC0, 0x1019, 0x8151, 0x1},
722 {0x1083, 0xC0, 0x1019, 0x1083, 0x1},
723 {0x1083, 0xC0, 0x1462, 0x7680, 0x1},
724 {0x1083, 0xC0, 0x1565, 0x2803, 0x1},
725 {0},
726 };
727 
728 static void __devinit atl1c_patch_assign(struct atl1c_hw *hw)
729 {
730 	struct pci_dev	*pdev = hw->adapter->pdev;
731 	u32 misc_ctrl;
732 	int i = 0;
733 
734 	hw->msi_lnkpatch = false;
735 
736 	while (plats[i].pci_did != 0) {
737 		if (plats[i].pci_did == hw->device_id &&
738 		    plats[i].pci_revid == hw->revision_id &&
739 		    plats[i].subsystem_vid == hw->subsystem_vendor_id &&
740 		    plats[i].subsystem_did == hw->subsystem_id) {
741 			if (plats[i].patch_flag & ATL1C_LINK_PATCH)
742 				hw->msi_lnkpatch = true;
743 		}
744 		i++;
745 	}
746 
747 	if (hw->device_id == PCI_DEVICE_ID_ATHEROS_L2C_B2 &&
748 	    hw->revision_id == L2CB_V21) {
749 		/* config acess mode */
750 		pci_write_config_dword(pdev, REG_PCIE_IND_ACC_ADDR,
751 				       REG_PCIE_DEV_MISC_CTRL);
752 		pci_read_config_dword(pdev, REG_PCIE_IND_ACC_DATA, &misc_ctrl);
753 		misc_ctrl &= ~0x100;
754 		pci_write_config_dword(pdev, REG_PCIE_IND_ACC_ADDR,
755 				       REG_PCIE_DEV_MISC_CTRL);
756 		pci_write_config_dword(pdev, REG_PCIE_IND_ACC_DATA, misc_ctrl);
757 	}
758 }
759 /**
760  * atl1c_sw_init - Initialize general software structures (struct atl1c_adapter)
761  * @adapter: board private structure to initialize
762  *
763  * atl1c_sw_init initializes the Adapter private data structure.
764  * Fields are initialized based on PCI device information and
765  * OS network device settings (MTU size).
766  */
767 static int __devinit atl1c_sw_init(struct atl1c_adapter *adapter)
768 {
769 	struct atl1c_hw *hw   = &adapter->hw;
770 	struct pci_dev	*pdev = adapter->pdev;
771 	u32 revision;
772 
773 
774 	adapter->wol = 0;
775 	device_set_wakeup_enable(&pdev->dev, false);
776 	adapter->link_speed = SPEED_0;
777 	adapter->link_duplex = FULL_DUPLEX;
778 	adapter->tpd_ring[0].count = 1024;
779 	adapter->rfd_ring.count = 512;
780 
781 	hw->vendor_id = pdev->vendor;
782 	hw->device_id = pdev->device;
783 	hw->subsystem_vendor_id = pdev->subsystem_vendor;
784 	hw->subsystem_id = pdev->subsystem_device;
785 	pci_read_config_dword(pdev, PCI_CLASS_REVISION, &revision);
786 	hw->revision_id = revision & 0xFF;
787 	/* before link up, we assume hibernate is true */
788 	hw->hibernate = true;
789 	hw->media_type = MEDIA_TYPE_AUTO_SENSOR;
790 	if (atl1c_setup_mac_funcs(hw) != 0) {
791 		dev_err(&pdev->dev, "set mac function pointers failed\n");
792 		return -1;
793 	}
794 	atl1c_patch_assign(hw);
795 
796 	hw->intr_mask = IMR_NORMAL_MASK;
797 	hw->phy_configured = false;
798 	hw->preamble_len = 7;
799 	hw->max_frame_size = adapter->netdev->mtu;
800 	hw->autoneg_advertised = ADVERTISED_Autoneg;
801 	hw->indirect_tab = 0xE4E4E4E4;
802 	hw->base_cpu = 0;
803 
804 	hw->ict = 50000;		/* 100ms */
805 	hw->smb_timer = 200000;	  	/* 400ms */
806 	hw->rx_imt = 200;
807 	hw->tx_imt = 1000;
808 
809 	hw->tpd_burst = 5;
810 	hw->rfd_burst = 8;
811 	hw->dma_order = atl1c_dma_ord_out;
812 	hw->dmar_block = atl1c_dma_req_1024;
813 
814 	if (atl1c_alloc_queues(adapter)) {
815 		dev_err(&pdev->dev, "Unable to allocate memory for queues\n");
816 		return -ENOMEM;
817 	}
818 	/* TODO */
819 	atl1c_set_rxbufsize(adapter, adapter->netdev);
820 	atomic_set(&adapter->irq_sem, 1);
821 	spin_lock_init(&adapter->mdio_lock);
822 	spin_lock_init(&adapter->tx_lock);
823 	set_bit(__AT_DOWN, &adapter->flags);
824 
825 	return 0;
826 }
827 
828 static inline void atl1c_clean_buffer(struct pci_dev *pdev,
829 				struct atl1c_buffer *buffer_info, int in_irq)
830 {
831 	u16 pci_driection;
832 	if (buffer_info->flags & ATL1C_BUFFER_FREE)
833 		return;
834 	if (buffer_info->dma) {
835 		if (buffer_info->flags & ATL1C_PCIMAP_FROMDEVICE)
836 			pci_driection = PCI_DMA_FROMDEVICE;
837 		else
838 			pci_driection = PCI_DMA_TODEVICE;
839 
840 		if (buffer_info->flags & ATL1C_PCIMAP_SINGLE)
841 			pci_unmap_single(pdev, buffer_info->dma,
842 					buffer_info->length, pci_driection);
843 		else if (buffer_info->flags & ATL1C_PCIMAP_PAGE)
844 			pci_unmap_page(pdev, buffer_info->dma,
845 					buffer_info->length, pci_driection);
846 	}
847 	if (buffer_info->skb) {
848 		if (in_irq)
849 			dev_kfree_skb_irq(buffer_info->skb);
850 		else
851 			dev_kfree_skb(buffer_info->skb);
852 	}
853 	buffer_info->dma = 0;
854 	buffer_info->skb = NULL;
855 	ATL1C_SET_BUFFER_STATE(buffer_info, ATL1C_BUFFER_FREE);
856 }
857 /**
858  * atl1c_clean_tx_ring - Free Tx-skb
859  * @adapter: board private structure
860  */
861 static void atl1c_clean_tx_ring(struct atl1c_adapter *adapter,
862 				enum atl1c_trans_queue type)
863 {
864 	struct atl1c_tpd_ring *tpd_ring = &adapter->tpd_ring[type];
865 	struct atl1c_buffer *buffer_info;
866 	struct pci_dev *pdev = adapter->pdev;
867 	u16 index, ring_count;
868 
869 	ring_count = tpd_ring->count;
870 	for (index = 0; index < ring_count; index++) {
871 		buffer_info = &tpd_ring->buffer_info[index];
872 		atl1c_clean_buffer(pdev, buffer_info, 0);
873 	}
874 
875 	/* Zero out Tx-buffers */
876 	memset(tpd_ring->desc, 0, sizeof(struct atl1c_tpd_desc) *
877 		ring_count);
878 	atomic_set(&tpd_ring->next_to_clean, 0);
879 	tpd_ring->next_to_use = 0;
880 }
881 
882 /**
883  * atl1c_clean_rx_ring - Free rx-reservation skbs
884  * @adapter: board private structure
885  */
886 static void atl1c_clean_rx_ring(struct atl1c_adapter *adapter)
887 {
888 	struct atl1c_rfd_ring *rfd_ring = &adapter->rfd_ring;
889 	struct atl1c_rrd_ring *rrd_ring = &adapter->rrd_ring;
890 	struct atl1c_buffer *buffer_info;
891 	struct pci_dev *pdev = adapter->pdev;
892 	int j;
893 
894 	for (j = 0; j < rfd_ring->count; j++) {
895 		buffer_info = &rfd_ring->buffer_info[j];
896 		atl1c_clean_buffer(pdev, buffer_info, 0);
897 	}
898 	/* zero out the descriptor ring */
899 	memset(rfd_ring->desc, 0, rfd_ring->size);
900 	rfd_ring->next_to_clean = 0;
901 	rfd_ring->next_to_use = 0;
902 	rrd_ring->next_to_use = 0;
903 	rrd_ring->next_to_clean = 0;
904 }
905 
906 /*
907  * Read / Write Ptr Initialize:
908  */
909 static void atl1c_init_ring_ptrs(struct atl1c_adapter *adapter)
910 {
911 	struct atl1c_tpd_ring *tpd_ring = adapter->tpd_ring;
912 	struct atl1c_rfd_ring *rfd_ring = &adapter->rfd_ring;
913 	struct atl1c_rrd_ring *rrd_ring = &adapter->rrd_ring;
914 	struct atl1c_buffer *buffer_info;
915 	int i, j;
916 
917 	for (i = 0; i < AT_MAX_TRANSMIT_QUEUE; i++) {
918 		tpd_ring[i].next_to_use = 0;
919 		atomic_set(&tpd_ring[i].next_to_clean, 0);
920 		buffer_info = tpd_ring[i].buffer_info;
921 		for (j = 0; j < tpd_ring->count; j++)
922 			ATL1C_SET_BUFFER_STATE(&buffer_info[i],
923 					ATL1C_BUFFER_FREE);
924 	}
925 	rfd_ring->next_to_use = 0;
926 	rfd_ring->next_to_clean = 0;
927 	rrd_ring->next_to_use = 0;
928 	rrd_ring->next_to_clean = 0;
929 	for (j = 0; j < rfd_ring->count; j++) {
930 		buffer_info = &rfd_ring->buffer_info[j];
931 		ATL1C_SET_BUFFER_STATE(buffer_info, ATL1C_BUFFER_FREE);
932 	}
933 }
934 
935 /**
936  * atl1c_free_ring_resources - Free Tx / RX descriptor Resources
937  * @adapter: board private structure
938  *
939  * Free all transmit software resources
940  */
941 static void atl1c_free_ring_resources(struct atl1c_adapter *adapter)
942 {
943 	struct pci_dev *pdev = adapter->pdev;
944 
945 	pci_free_consistent(pdev, adapter->ring_header.size,
946 					adapter->ring_header.desc,
947 					adapter->ring_header.dma);
948 	adapter->ring_header.desc = NULL;
949 
950 	/* Note: just free tdp_ring.buffer_info,
951 	*  it contain rfd_ring.buffer_info, do not double free */
952 	if (adapter->tpd_ring[0].buffer_info) {
953 		kfree(adapter->tpd_ring[0].buffer_info);
954 		adapter->tpd_ring[0].buffer_info = NULL;
955 	}
956 }
957 
958 /**
959  * atl1c_setup_mem_resources - allocate Tx / RX descriptor resources
960  * @adapter: board private structure
961  *
962  * Return 0 on success, negative on failure
963  */
964 static int atl1c_setup_ring_resources(struct atl1c_adapter *adapter)
965 {
966 	struct pci_dev *pdev = adapter->pdev;
967 	struct atl1c_tpd_ring *tpd_ring = adapter->tpd_ring;
968 	struct atl1c_rfd_ring *rfd_ring = &adapter->rfd_ring;
969 	struct atl1c_rrd_ring *rrd_ring = &adapter->rrd_ring;
970 	struct atl1c_ring_header *ring_header = &adapter->ring_header;
971 	int size;
972 	int i;
973 	int count = 0;
974 	int rx_desc_count = 0;
975 	u32 offset = 0;
976 
977 	rrd_ring->count = rfd_ring->count;
978 	for (i = 1; i < AT_MAX_TRANSMIT_QUEUE; i++)
979 		tpd_ring[i].count = tpd_ring[0].count;
980 
981 	/* 2 tpd queue, one high priority queue,
982 	 * another normal priority queue */
983 	size = sizeof(struct atl1c_buffer) * (tpd_ring->count * 2 +
984 		rfd_ring->count);
985 	tpd_ring->buffer_info = kzalloc(size, GFP_KERNEL);
986 	if (unlikely(!tpd_ring->buffer_info)) {
987 		dev_err(&pdev->dev, "kzalloc failed, size = %d\n",
988 			size);
989 		goto err_nomem;
990 	}
991 	for (i = 0; i < AT_MAX_TRANSMIT_QUEUE; i++) {
992 		tpd_ring[i].buffer_info =
993 			(tpd_ring->buffer_info + count);
994 		count += tpd_ring[i].count;
995 	}
996 
997 	rfd_ring->buffer_info =
998 		(tpd_ring->buffer_info + count);
999 	count += rfd_ring->count;
1000 	rx_desc_count += rfd_ring->count;
1001 
1002 	/*
1003 	 * real ring DMA buffer
1004 	 * each ring/block may need up to 8 bytes for alignment, hence the
1005 	 * additional bytes tacked onto the end.
1006 	 */
1007 	ring_header->size = size =
1008 		sizeof(struct atl1c_tpd_desc) * tpd_ring->count * 2 +
1009 		sizeof(struct atl1c_rx_free_desc) * rx_desc_count +
1010 		sizeof(struct atl1c_recv_ret_status) * rx_desc_count +
1011 		8 * 4;
1012 
1013 	ring_header->desc = pci_alloc_consistent(pdev, ring_header->size,
1014 				&ring_header->dma);
1015 	if (unlikely(!ring_header->desc)) {
1016 		dev_err(&pdev->dev, "pci_alloc_consistend failed\n");
1017 		goto err_nomem;
1018 	}
1019 	memset(ring_header->desc, 0, ring_header->size);
1020 	/* init TPD ring */
1021 
1022 	tpd_ring[0].dma = roundup(ring_header->dma, 8);
1023 	offset = tpd_ring[0].dma - ring_header->dma;
1024 	for (i = 0; i < AT_MAX_TRANSMIT_QUEUE; i++) {
1025 		tpd_ring[i].dma = ring_header->dma + offset;
1026 		tpd_ring[i].desc = (u8 *) ring_header->desc + offset;
1027 		tpd_ring[i].size =
1028 			sizeof(struct atl1c_tpd_desc) * tpd_ring[i].count;
1029 		offset += roundup(tpd_ring[i].size, 8);
1030 	}
1031 	/* init RFD ring */
1032 	rfd_ring->dma = ring_header->dma + offset;
1033 	rfd_ring->desc = (u8 *) ring_header->desc + offset;
1034 	rfd_ring->size = sizeof(struct atl1c_rx_free_desc) * rfd_ring->count;
1035 	offset += roundup(rfd_ring->size, 8);
1036 
1037 	/* init RRD ring */
1038 	rrd_ring->dma = ring_header->dma + offset;
1039 	rrd_ring->desc = (u8 *) ring_header->desc + offset;
1040 	rrd_ring->size = sizeof(struct atl1c_recv_ret_status) *
1041 		rrd_ring->count;
1042 	offset += roundup(rrd_ring->size, 8);
1043 
1044 	return 0;
1045 
1046 err_nomem:
1047 	kfree(tpd_ring->buffer_info);
1048 	return -ENOMEM;
1049 }
1050 
1051 static void atl1c_configure_des_ring(struct atl1c_adapter *adapter)
1052 {
1053 	struct atl1c_hw *hw = &adapter->hw;
1054 	struct atl1c_rfd_ring *rfd_ring = &adapter->rfd_ring;
1055 	struct atl1c_rrd_ring *rrd_ring = &adapter->rrd_ring;
1056 	struct atl1c_tpd_ring *tpd_ring = (struct atl1c_tpd_ring *)
1057 				adapter->tpd_ring;
1058 
1059 	/* TPD */
1060 	AT_WRITE_REG(hw, REG_TX_BASE_ADDR_HI,
1061 			(u32)((tpd_ring[atl1c_trans_normal].dma &
1062 				AT_DMA_HI_ADDR_MASK) >> 32));
1063 	/* just enable normal priority TX queue */
1064 	AT_WRITE_REG(hw, REG_TPD_PRI0_ADDR_LO,
1065 			(u32)(tpd_ring[atl1c_trans_normal].dma &
1066 				AT_DMA_LO_ADDR_MASK));
1067 	AT_WRITE_REG(hw, REG_TPD_PRI1_ADDR_LO,
1068 			(u32)(tpd_ring[atl1c_trans_high].dma &
1069 				AT_DMA_LO_ADDR_MASK));
1070 	AT_WRITE_REG(hw, REG_TPD_RING_SIZE,
1071 			(u32)(tpd_ring[0].count & TPD_RING_SIZE_MASK));
1072 
1073 
1074 	/* RFD */
1075 	AT_WRITE_REG(hw, REG_RX_BASE_ADDR_HI,
1076 			(u32)((rfd_ring->dma & AT_DMA_HI_ADDR_MASK) >> 32));
1077 	AT_WRITE_REG(hw, REG_RFD0_HEAD_ADDR_LO,
1078 			(u32)(rfd_ring->dma & AT_DMA_LO_ADDR_MASK));
1079 
1080 	AT_WRITE_REG(hw, REG_RFD_RING_SIZE,
1081 			rfd_ring->count & RFD_RING_SIZE_MASK);
1082 	AT_WRITE_REG(hw, REG_RX_BUF_SIZE,
1083 			adapter->rx_buffer_len & RX_BUF_SIZE_MASK);
1084 
1085 	/* RRD */
1086 	AT_WRITE_REG(hw, REG_RRD0_HEAD_ADDR_LO,
1087 			(u32)(rrd_ring->dma & AT_DMA_LO_ADDR_MASK));
1088 	AT_WRITE_REG(hw, REG_RRD_RING_SIZE,
1089 			(rrd_ring->count & RRD_RING_SIZE_MASK));
1090 
1091 	if (hw->nic_type == athr_l2c_b) {
1092 		AT_WRITE_REG(hw, REG_SRAM_RXF_LEN, 0x02a0L);
1093 		AT_WRITE_REG(hw, REG_SRAM_TXF_LEN, 0x0100L);
1094 		AT_WRITE_REG(hw, REG_SRAM_RXF_ADDR, 0x029f0000L);
1095 		AT_WRITE_REG(hw, REG_SRAM_RFD0_INFO, 0x02bf02a0L);
1096 		AT_WRITE_REG(hw, REG_SRAM_TXF_ADDR, 0x03bf02c0L);
1097 		AT_WRITE_REG(hw, REG_SRAM_TRD_ADDR, 0x03df03c0L);
1098 		AT_WRITE_REG(hw, REG_TXF_WATER_MARK, 0);	/* TX watermark, to enter l1 state.*/
1099 		AT_WRITE_REG(hw, REG_RXD_DMA_CTRL, 0);		/* RXD threshold.*/
1100 	}
1101 	/* Load all of base address above */
1102 	AT_WRITE_REG(hw, REG_LOAD_PTR, 1);
1103 }
1104 
1105 static void atl1c_configure_tx(struct atl1c_adapter *adapter)
1106 {
1107 	struct atl1c_hw *hw = &adapter->hw;
1108 	int max_pay_load;
1109 	u16 tx_offload_thresh;
1110 	u32 txq_ctrl_data;
1111 
1112 	tx_offload_thresh = MAX_TSO_FRAME_SIZE;
1113 	AT_WRITE_REG(hw, REG_TX_TSO_OFFLOAD_THRESH,
1114 		(tx_offload_thresh >> 3) & TX_TSO_OFFLOAD_THRESH_MASK);
1115 	max_pay_load = pcie_get_readrq(adapter->pdev) >> 8;
1116 	hw->dmar_block = min_t(u32, max_pay_load, hw->dmar_block);
1117 	/*
1118 	 * if BIOS had changed the dam-read-max-length to an invalid value,
1119 	 * restore it to default value
1120 	 */
1121 	if (hw->dmar_block < DEVICE_CTRL_MAXRRS_MIN) {
1122 		pcie_set_readrq(adapter->pdev, 128 << DEVICE_CTRL_MAXRRS_MIN);
1123 		hw->dmar_block = DEVICE_CTRL_MAXRRS_MIN;
1124 	}
1125 	txq_ctrl_data =
1126 		hw->nic_type == athr_l2c_b || hw->nic_type == athr_l2c_b2 ?
1127 		L2CB_TXQ_CFGV : L1C_TXQ_CFGV;
1128 
1129 	AT_WRITE_REG(hw, REG_TXQ_CTRL, txq_ctrl_data);
1130 }
1131 
1132 static void atl1c_configure_rx(struct atl1c_adapter *adapter)
1133 {
1134 	struct atl1c_hw *hw = &adapter->hw;
1135 	u32 rxq_ctrl_data;
1136 
1137 	rxq_ctrl_data = (hw->rfd_burst & RXQ_RFD_BURST_NUM_MASK) <<
1138 			RXQ_RFD_BURST_NUM_SHIFT;
1139 
1140 	if (hw->ctrl_flags & ATL1C_RX_IPV6_CHKSUM)
1141 		rxq_ctrl_data |= IPV6_CHKSUM_CTRL_EN;
1142 
1143 	/* aspm for gigabit */
1144 	if (hw->nic_type != athr_l1d_2 && (hw->device_id & 1) != 0)
1145 		rxq_ctrl_data = FIELD_SETX(rxq_ctrl_data, ASPM_THRUPUT_LIMIT,
1146 			ASPM_THRUPUT_LIMIT_100M);
1147 
1148 	AT_WRITE_REG(hw, REG_RXQ_CTRL, rxq_ctrl_data);
1149 }
1150 
1151 static void atl1c_configure_dma(struct atl1c_adapter *adapter)
1152 {
1153 	struct atl1c_hw *hw = &adapter->hw;
1154 	u32 dma_ctrl_data;
1155 
1156 	dma_ctrl_data = FIELDX(DMA_CTRL_RORDER_MODE, DMA_CTRL_RORDER_MODE_OUT) |
1157 		DMA_CTRL_RREQ_PRI_DATA |
1158 		FIELDX(DMA_CTRL_RREQ_BLEN, hw->dmar_block) |
1159 		FIELDX(DMA_CTRL_WDLY_CNT, DMA_CTRL_WDLY_CNT_DEF) |
1160 		FIELDX(DMA_CTRL_RDLY_CNT, DMA_CTRL_RDLY_CNT_DEF);
1161 
1162 	AT_WRITE_REG(hw, REG_DMA_CTRL, dma_ctrl_data);
1163 }
1164 
1165 /*
1166  * Stop the mac, transmit and receive units
1167  * hw - Struct containing variables accessed by shared code
1168  * return : 0  or  idle status (if error)
1169  */
1170 static int atl1c_stop_mac(struct atl1c_hw *hw)
1171 {
1172 	u32 data;
1173 
1174 	AT_READ_REG(hw, REG_RXQ_CTRL, &data);
1175 	data &= ~RXQ_CTRL_EN;
1176 	AT_WRITE_REG(hw, REG_RXQ_CTRL, data);
1177 
1178 	AT_READ_REG(hw, REG_TXQ_CTRL, &data);
1179 	data &= ~TXQ_CTRL_EN;
1180 	AT_WRITE_REG(hw, REG_TXQ_CTRL, data);
1181 
1182 	atl1c_wait_until_idle(hw, IDLE_STATUS_RXQ_BUSY | IDLE_STATUS_TXQ_BUSY);
1183 
1184 	AT_READ_REG(hw, REG_MAC_CTRL, &data);
1185 	data &= ~(MAC_CTRL_TX_EN | MAC_CTRL_RX_EN);
1186 	AT_WRITE_REG(hw, REG_MAC_CTRL, data);
1187 
1188 	return (int)atl1c_wait_until_idle(hw,
1189 		IDLE_STATUS_TXMAC_BUSY | IDLE_STATUS_RXMAC_BUSY);
1190 }
1191 
1192 static void atl1c_start_mac(struct atl1c_adapter *adapter)
1193 {
1194 	struct atl1c_hw *hw = &adapter->hw;
1195 	u32 mac, txq, rxq;
1196 
1197 	hw->mac_duplex = adapter->link_duplex == FULL_DUPLEX ? true : false;
1198 	hw->mac_speed = adapter->link_speed == SPEED_1000 ?
1199 		atl1c_mac_speed_1000 : atl1c_mac_speed_10_100;
1200 
1201 	AT_READ_REG(hw, REG_TXQ_CTRL, &txq);
1202 	AT_READ_REG(hw, REG_RXQ_CTRL, &rxq);
1203 	AT_READ_REG(hw, REG_MAC_CTRL, &mac);
1204 
1205 	txq |= TXQ_CTRL_EN;
1206 	rxq |= RXQ_CTRL_EN;
1207 	mac |= MAC_CTRL_TX_EN | MAC_CTRL_TX_FLOW |
1208 	       MAC_CTRL_RX_EN | MAC_CTRL_RX_FLOW |
1209 	       MAC_CTRL_ADD_CRC | MAC_CTRL_PAD |
1210 	       MAC_CTRL_BC_EN | MAC_CTRL_SINGLE_PAUSE_EN |
1211 	       MAC_CTRL_HASH_ALG_CRC32;
1212 	if (hw->mac_duplex)
1213 		mac |= MAC_CTRL_DUPLX;
1214 	else
1215 		mac &= ~MAC_CTRL_DUPLX;
1216 	mac = FIELD_SETX(mac, MAC_CTRL_SPEED, hw->mac_speed);
1217 	mac = FIELD_SETX(mac, MAC_CTRL_PRMLEN, hw->preamble_len);
1218 
1219 	AT_WRITE_REG(hw, REG_TXQ_CTRL, txq);
1220 	AT_WRITE_REG(hw, REG_RXQ_CTRL, rxq);
1221 	AT_WRITE_REG(hw, REG_MAC_CTRL, mac);
1222 }
1223 
1224 /*
1225  * Reset the transmit and receive units; mask and clear all interrupts.
1226  * hw - Struct containing variables accessed by shared code
1227  * return : 0  or  idle status (if error)
1228  */
1229 static int atl1c_reset_mac(struct atl1c_hw *hw)
1230 {
1231 	struct atl1c_adapter *adapter = hw->adapter;
1232 	struct pci_dev *pdev = adapter->pdev;
1233 	u32 ctrl_data = 0;
1234 
1235 	atl1c_stop_mac(hw);
1236 	/*
1237 	 * Issue Soft Reset to the MAC.  This will reset the chip's
1238 	 * transmit, receive, DMA.  It will not effect
1239 	 * the current PCI configuration.  The global reset bit is self-
1240 	 * clearing, and should clear within a microsecond.
1241 	 */
1242 	AT_READ_REG(hw, REG_MASTER_CTRL, &ctrl_data);
1243 	ctrl_data |= MASTER_CTRL_OOB_DIS;
1244 	AT_WRITE_REG(hw, REG_MASTER_CTRL, ctrl_data | MASTER_CTRL_SOFT_RST);
1245 
1246 	AT_WRITE_FLUSH(hw);
1247 	msleep(10);
1248 	/* Wait at least 10ms for All module to be Idle */
1249 
1250 	if (atl1c_wait_until_idle(hw, IDLE_STATUS_MASK)) {
1251 		dev_err(&pdev->dev,
1252 			"MAC state machine can't be idle since"
1253 			" disabled for 10ms second\n");
1254 		return -1;
1255 	}
1256 	AT_WRITE_REG(hw, REG_MASTER_CTRL, ctrl_data);
1257 
1258 	/* driver control speed/duplex */
1259 	AT_READ_REG(hw, REG_MAC_CTRL, &ctrl_data);
1260 	AT_WRITE_REG(hw, REG_MAC_CTRL, ctrl_data | MAC_CTRL_SPEED_MODE_SW);
1261 
1262 	/* clk switch setting */
1263 	AT_READ_REG(hw, REG_SERDES, &ctrl_data);
1264 	switch (hw->nic_type) {
1265 	case athr_l2c_b:
1266 		ctrl_data &= ~(SERDES_PHY_CLK_SLOWDOWN |
1267 				SERDES_MAC_CLK_SLOWDOWN);
1268 		AT_WRITE_REG(hw, REG_SERDES, ctrl_data);
1269 		break;
1270 	case athr_l2c_b2:
1271 	case athr_l1d_2:
1272 		ctrl_data |= SERDES_PHY_CLK_SLOWDOWN | SERDES_MAC_CLK_SLOWDOWN;
1273 		AT_WRITE_REG(hw, REG_SERDES, ctrl_data);
1274 		break;
1275 	default:
1276 		break;
1277 	}
1278 
1279 	return 0;
1280 }
1281 
1282 static void atl1c_disable_l0s_l1(struct atl1c_hw *hw)
1283 {
1284 	u16 ctrl_flags = hw->ctrl_flags;
1285 
1286 	hw->ctrl_flags &= ~(ATL1C_ASPM_L0S_SUPPORT | ATL1C_ASPM_L1_SUPPORT);
1287 	atl1c_set_aspm(hw, SPEED_0);
1288 	hw->ctrl_flags = ctrl_flags;
1289 }
1290 
1291 /*
1292  * Set ASPM state.
1293  * Enable/disable L0s/L1 depend on link state.
1294  */
1295 static void atl1c_set_aspm(struct atl1c_hw *hw, u16 link_speed)
1296 {
1297 	u32 pm_ctrl_data;
1298 	u32 link_l1_timer;
1299 
1300 	AT_READ_REG(hw, REG_PM_CTRL, &pm_ctrl_data);
1301 	pm_ctrl_data &= ~(PM_CTRL_ASPM_L1_EN |
1302 			  PM_CTRL_ASPM_L0S_EN |
1303 			  PM_CTRL_MAC_ASPM_CHK);
1304 	/* L1 timer */
1305 	if (hw->nic_type == athr_l2c_b2 || hw->nic_type == athr_l1d_2) {
1306 		pm_ctrl_data &= ~PMCTRL_TXL1_AFTER_L0S;
1307 		link_l1_timer =
1308 			link_speed == SPEED_1000 || link_speed == SPEED_100 ?
1309 			L1D_PMCTRL_L1_ENTRY_TM_16US : 1;
1310 		pm_ctrl_data = FIELD_SETX(pm_ctrl_data,
1311 			L1D_PMCTRL_L1_ENTRY_TM, link_l1_timer);
1312 	} else {
1313 		link_l1_timer = hw->nic_type == athr_l2c_b ?
1314 			L2CB1_PM_CTRL_L1_ENTRY_TM : L1C_PM_CTRL_L1_ENTRY_TM;
1315 		if (link_speed != SPEED_1000 && link_speed != SPEED_100)
1316 			link_l1_timer = 1;
1317 		pm_ctrl_data = FIELD_SETX(pm_ctrl_data,
1318 			PM_CTRL_L1_ENTRY_TIMER, link_l1_timer);
1319 	}
1320 
1321 	/* L0S/L1 enable */
1322 	if ((hw->ctrl_flags & ATL1C_ASPM_L0S_SUPPORT) && link_speed != SPEED_0)
1323 		pm_ctrl_data |= PM_CTRL_ASPM_L0S_EN | PM_CTRL_MAC_ASPM_CHK;
1324 	if (hw->ctrl_flags & ATL1C_ASPM_L1_SUPPORT)
1325 		pm_ctrl_data |= PM_CTRL_ASPM_L1_EN | PM_CTRL_MAC_ASPM_CHK;
1326 
1327 	/* l2cb & l1d & l2cb2 & l1d2 */
1328 	if (hw->nic_type == athr_l2c_b || hw->nic_type == athr_l1d ||
1329 	    hw->nic_type == athr_l2c_b2 || hw->nic_type == athr_l1d_2) {
1330 		pm_ctrl_data = FIELD_SETX(pm_ctrl_data,
1331 			PM_CTRL_PM_REQ_TIMER, PM_CTRL_PM_REQ_TO_DEF);
1332 		pm_ctrl_data |= PM_CTRL_RCVR_WT_TIMER |
1333 				PM_CTRL_SERDES_PD_EX_L1 |
1334 				PM_CTRL_CLK_SWH_L1;
1335 		pm_ctrl_data &= ~(PM_CTRL_SERDES_L1_EN |
1336 				  PM_CTRL_SERDES_PLL_L1_EN |
1337 				  PM_CTRL_SERDES_BUFS_RX_L1_EN |
1338 				  PM_CTRL_SA_DLY_EN |
1339 				  PM_CTRL_HOTRST);
1340 		/* disable l0s if link down or l2cb */
1341 		if (link_speed == SPEED_0 || hw->nic_type == athr_l2c_b)
1342 			pm_ctrl_data &= ~PM_CTRL_ASPM_L0S_EN;
1343 	} else { /* l1c */
1344 		pm_ctrl_data =
1345 			FIELD_SETX(pm_ctrl_data, PM_CTRL_L1_ENTRY_TIMER, 0);
1346 		if (link_speed != SPEED_0) {
1347 			pm_ctrl_data |= PM_CTRL_SERDES_L1_EN |
1348 					PM_CTRL_SERDES_PLL_L1_EN |
1349 					PM_CTRL_SERDES_BUFS_RX_L1_EN;
1350 			pm_ctrl_data &= ~(PM_CTRL_SERDES_PD_EX_L1 |
1351 					  PM_CTRL_CLK_SWH_L1 |
1352 					  PM_CTRL_ASPM_L0S_EN |
1353 					  PM_CTRL_ASPM_L1_EN);
1354 		} else { /* link down */
1355 			pm_ctrl_data |= PM_CTRL_CLK_SWH_L1;
1356 			pm_ctrl_data &= ~(PM_CTRL_SERDES_L1_EN |
1357 					  PM_CTRL_SERDES_PLL_L1_EN |
1358 					  PM_CTRL_SERDES_BUFS_RX_L1_EN |
1359 					  PM_CTRL_ASPM_L0S_EN);
1360 		}
1361 	}
1362 	AT_WRITE_REG(hw, REG_PM_CTRL, pm_ctrl_data);
1363 
1364 	return;
1365 }
1366 
1367 /**
1368  * atl1c_configure - Configure Transmit&Receive Unit after Reset
1369  * @adapter: board private structure
1370  *
1371  * Configure the Tx /Rx unit of the MAC after a reset.
1372  */
1373 static int atl1c_configure_mac(struct atl1c_adapter *adapter)
1374 {
1375 	struct atl1c_hw *hw = &adapter->hw;
1376 	u32 master_ctrl_data = 0;
1377 	u32 intr_modrt_data;
1378 	u32 data;
1379 
1380 	AT_READ_REG(hw, REG_MASTER_CTRL, &master_ctrl_data);
1381 	master_ctrl_data &= ~(MASTER_CTRL_TX_ITIMER_EN |
1382 			      MASTER_CTRL_RX_ITIMER_EN |
1383 			      MASTER_CTRL_INT_RDCLR);
1384 	/* clear interrupt status */
1385 	AT_WRITE_REG(hw, REG_ISR, 0xFFFFFFFF);
1386 	/*  Clear any WOL status */
1387 	AT_WRITE_REG(hw, REG_WOL_CTRL, 0);
1388 	/* set Interrupt Clear Timer
1389 	 * HW will enable self to assert interrupt event to system after
1390 	 * waiting x-time for software to notify it accept interrupt.
1391 	 */
1392 
1393 	data = CLK_GATING_EN_ALL;
1394 	if (hw->ctrl_flags & ATL1C_CLK_GATING_EN) {
1395 		if (hw->nic_type == athr_l2c_b)
1396 			data &= ~CLK_GATING_RXMAC_EN;
1397 	} else
1398 		data = 0;
1399 	AT_WRITE_REG(hw, REG_CLK_GATING_CTRL, data);
1400 
1401 	AT_WRITE_REG(hw, REG_INT_RETRIG_TIMER,
1402 		hw->ict & INT_RETRIG_TIMER_MASK);
1403 
1404 	atl1c_configure_des_ring(adapter);
1405 
1406 	if (hw->ctrl_flags & ATL1C_INTR_MODRT_ENABLE) {
1407 		intr_modrt_data = (hw->tx_imt & IRQ_MODRT_TIMER_MASK) <<
1408 					IRQ_MODRT_TX_TIMER_SHIFT;
1409 		intr_modrt_data |= (hw->rx_imt & IRQ_MODRT_TIMER_MASK) <<
1410 					IRQ_MODRT_RX_TIMER_SHIFT;
1411 		AT_WRITE_REG(hw, REG_IRQ_MODRT_TIMER_INIT, intr_modrt_data);
1412 		master_ctrl_data |=
1413 			MASTER_CTRL_TX_ITIMER_EN | MASTER_CTRL_RX_ITIMER_EN;
1414 	}
1415 
1416 	if (hw->ctrl_flags & ATL1C_INTR_CLEAR_ON_READ)
1417 		master_ctrl_data |= MASTER_CTRL_INT_RDCLR;
1418 
1419 	master_ctrl_data |= MASTER_CTRL_SA_TIMER_EN;
1420 	AT_WRITE_REG(hw, REG_MASTER_CTRL, master_ctrl_data);
1421 
1422 	AT_WRITE_REG(hw, REG_SMB_STAT_TIMER,
1423 		hw->smb_timer & SMB_STAT_TIMER_MASK);
1424 
1425 	/* set MTU */
1426 	AT_WRITE_REG(hw, REG_MTU, hw->max_frame_size + ETH_HLEN +
1427 			VLAN_HLEN + ETH_FCS_LEN);
1428 
1429 	atl1c_configure_tx(adapter);
1430 	atl1c_configure_rx(adapter);
1431 	atl1c_configure_dma(adapter);
1432 
1433 	return 0;
1434 }
1435 
1436 static int atl1c_configure(struct atl1c_adapter *adapter)
1437 {
1438 	struct net_device *netdev = adapter->netdev;
1439 	int num;
1440 
1441 	atl1c_init_ring_ptrs(adapter);
1442 	atl1c_set_multi(netdev);
1443 	atl1c_restore_vlan(adapter);
1444 
1445 	num = atl1c_alloc_rx_buffer(adapter);
1446 	if (unlikely(num == 0))
1447 		return -ENOMEM;
1448 
1449 	if (atl1c_configure_mac(adapter))
1450 		return -EIO;
1451 
1452 	return 0;
1453 }
1454 
1455 static void atl1c_update_hw_stats(struct atl1c_adapter *adapter)
1456 {
1457 	u16 hw_reg_addr = 0;
1458 	unsigned long *stats_item = NULL;
1459 	u32 data;
1460 
1461 	/* update rx status */
1462 	hw_reg_addr = REG_MAC_RX_STATUS_BIN;
1463 	stats_item  = &adapter->hw_stats.rx_ok;
1464 	while (hw_reg_addr <= REG_MAC_RX_STATUS_END) {
1465 		AT_READ_REG(&adapter->hw, hw_reg_addr, &data);
1466 		*stats_item += data;
1467 		stats_item++;
1468 		hw_reg_addr += 4;
1469 	}
1470 /* update tx status */
1471 	hw_reg_addr = REG_MAC_TX_STATUS_BIN;
1472 	stats_item  = &adapter->hw_stats.tx_ok;
1473 	while (hw_reg_addr <= REG_MAC_TX_STATUS_END) {
1474 		AT_READ_REG(&adapter->hw, hw_reg_addr, &data);
1475 		*stats_item += data;
1476 		stats_item++;
1477 		hw_reg_addr += 4;
1478 	}
1479 }
1480 
1481 /**
1482  * atl1c_get_stats - Get System Network Statistics
1483  * @netdev: network interface device structure
1484  *
1485  * Returns the address of the device statistics structure.
1486  * The statistics are actually updated from the timer callback.
1487  */
1488 static struct net_device_stats *atl1c_get_stats(struct net_device *netdev)
1489 {
1490 	struct atl1c_adapter *adapter = netdev_priv(netdev);
1491 	struct atl1c_hw_stats  *hw_stats = &adapter->hw_stats;
1492 	struct net_device_stats *net_stats = &netdev->stats;
1493 
1494 	atl1c_update_hw_stats(adapter);
1495 	net_stats->rx_packets = hw_stats->rx_ok;
1496 	net_stats->tx_packets = hw_stats->tx_ok;
1497 	net_stats->rx_bytes   = hw_stats->rx_byte_cnt;
1498 	net_stats->tx_bytes   = hw_stats->tx_byte_cnt;
1499 	net_stats->multicast  = hw_stats->rx_mcast;
1500 	net_stats->collisions = hw_stats->tx_1_col +
1501 				hw_stats->tx_2_col * 2 +
1502 				hw_stats->tx_late_col + hw_stats->tx_abort_col;
1503 	net_stats->rx_errors  = hw_stats->rx_frag + hw_stats->rx_fcs_err +
1504 				hw_stats->rx_len_err + hw_stats->rx_sz_ov +
1505 				hw_stats->rx_rrd_ov + hw_stats->rx_align_err;
1506 	net_stats->rx_fifo_errors   = hw_stats->rx_rxf_ov;
1507 	net_stats->rx_length_errors = hw_stats->rx_len_err;
1508 	net_stats->rx_crc_errors    = hw_stats->rx_fcs_err;
1509 	net_stats->rx_frame_errors  = hw_stats->rx_align_err;
1510 	net_stats->rx_over_errors   = hw_stats->rx_rrd_ov + hw_stats->rx_rxf_ov;
1511 
1512 	net_stats->rx_missed_errors = hw_stats->rx_rrd_ov + hw_stats->rx_rxf_ov;
1513 
1514 	net_stats->tx_errors = hw_stats->tx_late_col + hw_stats->tx_abort_col +
1515 				hw_stats->tx_underrun + hw_stats->tx_trunc;
1516 	net_stats->tx_fifo_errors    = hw_stats->tx_underrun;
1517 	net_stats->tx_aborted_errors = hw_stats->tx_abort_col;
1518 	net_stats->tx_window_errors  = hw_stats->tx_late_col;
1519 
1520 	return net_stats;
1521 }
1522 
1523 static inline void atl1c_clear_phy_int(struct atl1c_adapter *adapter)
1524 {
1525 	u16 phy_data;
1526 
1527 	spin_lock(&adapter->mdio_lock);
1528 	atl1c_read_phy_reg(&adapter->hw, MII_ISR, &phy_data);
1529 	spin_unlock(&adapter->mdio_lock);
1530 }
1531 
1532 static bool atl1c_clean_tx_irq(struct atl1c_adapter *adapter,
1533 				enum atl1c_trans_queue type)
1534 {
1535 	struct atl1c_tpd_ring *tpd_ring = &adapter->tpd_ring[type];
1536 	struct atl1c_buffer *buffer_info;
1537 	struct pci_dev *pdev = adapter->pdev;
1538 	u16 next_to_clean = atomic_read(&tpd_ring->next_to_clean);
1539 	u16 hw_next_to_clean;
1540 	u16 reg;
1541 
1542 	reg = type == atl1c_trans_high ? REG_TPD_PRI1_CIDX : REG_TPD_PRI0_CIDX;
1543 
1544 	AT_READ_REGW(&adapter->hw, reg, &hw_next_to_clean);
1545 
1546 	while (next_to_clean != hw_next_to_clean) {
1547 		buffer_info = &tpd_ring->buffer_info[next_to_clean];
1548 		atl1c_clean_buffer(pdev, buffer_info, 1);
1549 		if (++next_to_clean == tpd_ring->count)
1550 			next_to_clean = 0;
1551 		atomic_set(&tpd_ring->next_to_clean, next_to_clean);
1552 	}
1553 
1554 	if (netif_queue_stopped(adapter->netdev) &&
1555 			netif_carrier_ok(adapter->netdev)) {
1556 		netif_wake_queue(adapter->netdev);
1557 	}
1558 
1559 	return true;
1560 }
1561 
1562 /**
1563  * atl1c_intr - Interrupt Handler
1564  * @irq: interrupt number
1565  * @data: pointer to a network interface device structure
1566  */
1567 static irqreturn_t atl1c_intr(int irq, void *data)
1568 {
1569 	struct net_device *netdev  = data;
1570 	struct atl1c_adapter *adapter = netdev_priv(netdev);
1571 	struct pci_dev *pdev = adapter->pdev;
1572 	struct atl1c_hw *hw = &adapter->hw;
1573 	int max_ints = AT_MAX_INT_WORK;
1574 	int handled = IRQ_NONE;
1575 	u32 status;
1576 	u32 reg_data;
1577 
1578 	do {
1579 		AT_READ_REG(hw, REG_ISR, &reg_data);
1580 		status = reg_data & hw->intr_mask;
1581 
1582 		if (status == 0 || (status & ISR_DIS_INT) != 0) {
1583 			if (max_ints != AT_MAX_INT_WORK)
1584 				handled = IRQ_HANDLED;
1585 			break;
1586 		}
1587 		/* link event */
1588 		if (status & ISR_GPHY)
1589 			atl1c_clear_phy_int(adapter);
1590 		/* Ack ISR */
1591 		AT_WRITE_REG(hw, REG_ISR, status | ISR_DIS_INT);
1592 		if (status & ISR_RX_PKT) {
1593 			if (likely(napi_schedule_prep(&adapter->napi))) {
1594 				hw->intr_mask &= ~ISR_RX_PKT;
1595 				AT_WRITE_REG(hw, REG_IMR, hw->intr_mask);
1596 				__napi_schedule(&adapter->napi);
1597 			}
1598 		}
1599 		if (status & ISR_TX_PKT)
1600 			atl1c_clean_tx_irq(adapter, atl1c_trans_normal);
1601 
1602 		handled = IRQ_HANDLED;
1603 		/* check if PCIE PHY Link down */
1604 		if (status & ISR_ERROR) {
1605 			if (netif_msg_hw(adapter))
1606 				dev_err(&pdev->dev,
1607 					"atl1c hardware error (status = 0x%x)\n",
1608 					status & ISR_ERROR);
1609 			/* reset MAC */
1610 			set_bit(ATL1C_WORK_EVENT_RESET, &adapter->work_event);
1611 			schedule_work(&adapter->common_task);
1612 			return IRQ_HANDLED;
1613 		}
1614 
1615 		if (status & ISR_OVER)
1616 			if (netif_msg_intr(adapter))
1617 				dev_warn(&pdev->dev,
1618 					"TX/RX overflow (status = 0x%x)\n",
1619 					status & ISR_OVER);
1620 
1621 		/* link event */
1622 		if (status & (ISR_GPHY | ISR_MANUAL)) {
1623 			netdev->stats.tx_carrier_errors++;
1624 			atl1c_link_chg_event(adapter);
1625 			break;
1626 		}
1627 
1628 	} while (--max_ints > 0);
1629 	/* re-enable Interrupt*/
1630 	AT_WRITE_REG(&adapter->hw, REG_ISR, 0);
1631 	return handled;
1632 }
1633 
1634 static inline void atl1c_rx_checksum(struct atl1c_adapter *adapter,
1635 		  struct sk_buff *skb, struct atl1c_recv_ret_status *prrs)
1636 {
1637 	/*
1638 	 * The pid field in RRS in not correct sometimes, so we
1639 	 * cannot figure out if the packet is fragmented or not,
1640 	 * so we tell the KERNEL CHECKSUM_NONE
1641 	 */
1642 	skb_checksum_none_assert(skb);
1643 }
1644 
1645 static int atl1c_alloc_rx_buffer(struct atl1c_adapter *adapter)
1646 {
1647 	struct atl1c_rfd_ring *rfd_ring = &adapter->rfd_ring;
1648 	struct pci_dev *pdev = adapter->pdev;
1649 	struct atl1c_buffer *buffer_info, *next_info;
1650 	struct sk_buff *skb;
1651 	void *vir_addr = NULL;
1652 	u16 num_alloc = 0;
1653 	u16 rfd_next_to_use, next_next;
1654 	struct atl1c_rx_free_desc *rfd_desc;
1655 
1656 	next_next = rfd_next_to_use = rfd_ring->next_to_use;
1657 	if (++next_next == rfd_ring->count)
1658 		next_next = 0;
1659 	buffer_info = &rfd_ring->buffer_info[rfd_next_to_use];
1660 	next_info = &rfd_ring->buffer_info[next_next];
1661 
1662 	while (next_info->flags & ATL1C_BUFFER_FREE) {
1663 		rfd_desc = ATL1C_RFD_DESC(rfd_ring, rfd_next_to_use);
1664 
1665 		skb = netdev_alloc_skb(adapter->netdev, adapter->rx_buffer_len);
1666 		if (unlikely(!skb)) {
1667 			if (netif_msg_rx_err(adapter))
1668 				dev_warn(&pdev->dev, "alloc rx buffer failed\n");
1669 			break;
1670 		}
1671 
1672 		/*
1673 		 * Make buffer alignment 2 beyond a 16 byte boundary
1674 		 * this will result in a 16 byte aligned IP header after
1675 		 * the 14 byte MAC header is removed
1676 		 */
1677 		vir_addr = skb->data;
1678 		ATL1C_SET_BUFFER_STATE(buffer_info, ATL1C_BUFFER_BUSY);
1679 		buffer_info->skb = skb;
1680 		buffer_info->length = adapter->rx_buffer_len;
1681 		buffer_info->dma = pci_map_single(pdev, vir_addr,
1682 						buffer_info->length,
1683 						PCI_DMA_FROMDEVICE);
1684 		ATL1C_SET_PCIMAP_TYPE(buffer_info, ATL1C_PCIMAP_SINGLE,
1685 			ATL1C_PCIMAP_FROMDEVICE);
1686 		rfd_desc->buffer_addr = cpu_to_le64(buffer_info->dma);
1687 		rfd_next_to_use = next_next;
1688 		if (++next_next == rfd_ring->count)
1689 			next_next = 0;
1690 		buffer_info = &rfd_ring->buffer_info[rfd_next_to_use];
1691 		next_info = &rfd_ring->buffer_info[next_next];
1692 		num_alloc++;
1693 	}
1694 
1695 	if (num_alloc) {
1696 		/* TODO: update mailbox here */
1697 		wmb();
1698 		rfd_ring->next_to_use = rfd_next_to_use;
1699 		AT_WRITE_REG(&adapter->hw, REG_MB_RFD0_PROD_IDX,
1700 			rfd_ring->next_to_use & MB_RFDX_PROD_IDX_MASK);
1701 	}
1702 
1703 	return num_alloc;
1704 }
1705 
1706 static void atl1c_clean_rrd(struct atl1c_rrd_ring *rrd_ring,
1707 			struct	atl1c_recv_ret_status *rrs, u16 num)
1708 {
1709 	u16 i;
1710 	/* the relationship between rrd and rfd is one map one */
1711 	for (i = 0; i < num; i++, rrs = ATL1C_RRD_DESC(rrd_ring,
1712 					rrd_ring->next_to_clean)) {
1713 		rrs->word3 &= ~RRS_RXD_UPDATED;
1714 		if (++rrd_ring->next_to_clean == rrd_ring->count)
1715 			rrd_ring->next_to_clean = 0;
1716 	}
1717 }
1718 
1719 static void atl1c_clean_rfd(struct atl1c_rfd_ring *rfd_ring,
1720 	struct atl1c_recv_ret_status *rrs, u16 num)
1721 {
1722 	u16 i;
1723 	u16 rfd_index;
1724 	struct atl1c_buffer *buffer_info = rfd_ring->buffer_info;
1725 
1726 	rfd_index = (rrs->word0 >> RRS_RX_RFD_INDEX_SHIFT) &
1727 			RRS_RX_RFD_INDEX_MASK;
1728 	for (i = 0; i < num; i++) {
1729 		buffer_info[rfd_index].skb = NULL;
1730 		ATL1C_SET_BUFFER_STATE(&buffer_info[rfd_index],
1731 					ATL1C_BUFFER_FREE);
1732 		if (++rfd_index == rfd_ring->count)
1733 			rfd_index = 0;
1734 	}
1735 	rfd_ring->next_to_clean = rfd_index;
1736 }
1737 
1738 static void atl1c_clean_rx_irq(struct atl1c_adapter *adapter,
1739 		   int *work_done, int work_to_do)
1740 {
1741 	u16 rfd_num, rfd_index;
1742 	u16 count = 0;
1743 	u16 length;
1744 	struct pci_dev *pdev = adapter->pdev;
1745 	struct net_device *netdev  = adapter->netdev;
1746 	struct atl1c_rfd_ring *rfd_ring = &adapter->rfd_ring;
1747 	struct atl1c_rrd_ring *rrd_ring = &adapter->rrd_ring;
1748 	struct sk_buff *skb;
1749 	struct atl1c_recv_ret_status *rrs;
1750 	struct atl1c_buffer *buffer_info;
1751 
1752 	while (1) {
1753 		if (*work_done >= work_to_do)
1754 			break;
1755 		rrs = ATL1C_RRD_DESC(rrd_ring, rrd_ring->next_to_clean);
1756 		if (likely(RRS_RXD_IS_VALID(rrs->word3))) {
1757 			rfd_num = (rrs->word0 >> RRS_RX_RFD_CNT_SHIFT) &
1758 				RRS_RX_RFD_CNT_MASK;
1759 			if (unlikely(rfd_num != 1))
1760 				/* TODO support mul rfd*/
1761 				if (netif_msg_rx_err(adapter))
1762 					dev_warn(&pdev->dev,
1763 						"Multi rfd not support yet!\n");
1764 			goto rrs_checked;
1765 		} else {
1766 			break;
1767 		}
1768 rrs_checked:
1769 		atl1c_clean_rrd(rrd_ring, rrs, rfd_num);
1770 		if (rrs->word3 & (RRS_RX_ERR_SUM | RRS_802_3_LEN_ERR)) {
1771 			atl1c_clean_rfd(rfd_ring, rrs, rfd_num);
1772 				if (netif_msg_rx_err(adapter))
1773 					dev_warn(&pdev->dev,
1774 						"wrong packet! rrs word3 is %x\n",
1775 						rrs->word3);
1776 			continue;
1777 		}
1778 
1779 		length = le16_to_cpu((rrs->word3 >> RRS_PKT_SIZE_SHIFT) &
1780 				RRS_PKT_SIZE_MASK);
1781 		/* Good Receive */
1782 		if (likely(rfd_num == 1)) {
1783 			rfd_index = (rrs->word0 >> RRS_RX_RFD_INDEX_SHIFT) &
1784 					RRS_RX_RFD_INDEX_MASK;
1785 			buffer_info = &rfd_ring->buffer_info[rfd_index];
1786 			pci_unmap_single(pdev, buffer_info->dma,
1787 				buffer_info->length, PCI_DMA_FROMDEVICE);
1788 			skb = buffer_info->skb;
1789 		} else {
1790 			/* TODO */
1791 			if (netif_msg_rx_err(adapter))
1792 				dev_warn(&pdev->dev,
1793 					"Multi rfd not support yet!\n");
1794 			break;
1795 		}
1796 		atl1c_clean_rfd(rfd_ring, rrs, rfd_num);
1797 		skb_put(skb, length - ETH_FCS_LEN);
1798 		skb->protocol = eth_type_trans(skb, netdev);
1799 		atl1c_rx_checksum(adapter, skb, rrs);
1800 		if (rrs->word3 & RRS_VLAN_INS) {
1801 			u16 vlan;
1802 
1803 			AT_TAG_TO_VLAN(rrs->vlan_tag, vlan);
1804 			vlan = le16_to_cpu(vlan);
1805 			__vlan_hwaccel_put_tag(skb, vlan);
1806 		}
1807 		netif_receive_skb(skb);
1808 
1809 		(*work_done)++;
1810 		count++;
1811 	}
1812 	if (count)
1813 		atl1c_alloc_rx_buffer(adapter);
1814 }
1815 
1816 /**
1817  * atl1c_clean - NAPI Rx polling callback
1818  */
1819 static int atl1c_clean(struct napi_struct *napi, int budget)
1820 {
1821 	struct atl1c_adapter *adapter =
1822 			container_of(napi, struct atl1c_adapter, napi);
1823 	int work_done = 0;
1824 
1825 	/* Keep link state information with original netdev */
1826 	if (!netif_carrier_ok(adapter->netdev))
1827 		goto quit_polling;
1828 	/* just enable one RXQ */
1829 	atl1c_clean_rx_irq(adapter, &work_done, budget);
1830 
1831 	if (work_done < budget) {
1832 quit_polling:
1833 		napi_complete(napi);
1834 		adapter->hw.intr_mask |= ISR_RX_PKT;
1835 		AT_WRITE_REG(&adapter->hw, REG_IMR, adapter->hw.intr_mask);
1836 	}
1837 	return work_done;
1838 }
1839 
1840 #ifdef CONFIG_NET_POLL_CONTROLLER
1841 
1842 /*
1843  * Polling 'interrupt' - used by things like netconsole to send skbs
1844  * without having to re-enable interrupts. It's not called while
1845  * the interrupt routine is executing.
1846  */
1847 static void atl1c_netpoll(struct net_device *netdev)
1848 {
1849 	struct atl1c_adapter *adapter = netdev_priv(netdev);
1850 
1851 	disable_irq(adapter->pdev->irq);
1852 	atl1c_intr(adapter->pdev->irq, netdev);
1853 	enable_irq(adapter->pdev->irq);
1854 }
1855 #endif
1856 
1857 static inline u16 atl1c_tpd_avail(struct atl1c_adapter *adapter, enum atl1c_trans_queue type)
1858 {
1859 	struct atl1c_tpd_ring *tpd_ring = &adapter->tpd_ring[type];
1860 	u16 next_to_use = 0;
1861 	u16 next_to_clean = 0;
1862 
1863 	next_to_clean = atomic_read(&tpd_ring->next_to_clean);
1864 	next_to_use   = tpd_ring->next_to_use;
1865 
1866 	return (u16)(next_to_clean > next_to_use) ?
1867 		(next_to_clean - next_to_use - 1) :
1868 		(tpd_ring->count + next_to_clean - next_to_use - 1);
1869 }
1870 
1871 /*
1872  * get next usable tpd
1873  * Note: should call atl1c_tdp_avail to make sure
1874  * there is enough tpd to use
1875  */
1876 static struct atl1c_tpd_desc *atl1c_get_tpd(struct atl1c_adapter *adapter,
1877 	enum atl1c_trans_queue type)
1878 {
1879 	struct atl1c_tpd_ring *tpd_ring = &adapter->tpd_ring[type];
1880 	struct atl1c_tpd_desc *tpd_desc;
1881 	u16 next_to_use = 0;
1882 
1883 	next_to_use = tpd_ring->next_to_use;
1884 	if (++tpd_ring->next_to_use == tpd_ring->count)
1885 		tpd_ring->next_to_use = 0;
1886 	tpd_desc = ATL1C_TPD_DESC(tpd_ring, next_to_use);
1887 	memset(tpd_desc, 0, sizeof(struct atl1c_tpd_desc));
1888 	return	tpd_desc;
1889 }
1890 
1891 static struct atl1c_buffer *
1892 atl1c_get_tx_buffer(struct atl1c_adapter *adapter, struct atl1c_tpd_desc *tpd)
1893 {
1894 	struct atl1c_tpd_ring *tpd_ring = adapter->tpd_ring;
1895 
1896 	return &tpd_ring->buffer_info[tpd -
1897 			(struct atl1c_tpd_desc *)tpd_ring->desc];
1898 }
1899 
1900 /* Calculate the transmit packet descript needed*/
1901 static u16 atl1c_cal_tpd_req(const struct sk_buff *skb)
1902 {
1903 	u16 tpd_req;
1904 	u16 proto_hdr_len = 0;
1905 
1906 	tpd_req = skb_shinfo(skb)->nr_frags + 1;
1907 
1908 	if (skb_is_gso(skb)) {
1909 		proto_hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
1910 		if (proto_hdr_len < skb_headlen(skb))
1911 			tpd_req++;
1912 		if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6)
1913 			tpd_req++;
1914 	}
1915 	return tpd_req;
1916 }
1917 
1918 static int atl1c_tso_csum(struct atl1c_adapter *adapter,
1919 			  struct sk_buff *skb,
1920 			  struct atl1c_tpd_desc **tpd,
1921 			  enum atl1c_trans_queue type)
1922 {
1923 	struct pci_dev *pdev = adapter->pdev;
1924 	u8 hdr_len;
1925 	u32 real_len;
1926 	unsigned short offload_type;
1927 	int err;
1928 
1929 	if (skb_is_gso(skb)) {
1930 		if (skb_header_cloned(skb)) {
1931 			err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
1932 			if (unlikely(err))
1933 				return -1;
1934 		}
1935 		offload_type = skb_shinfo(skb)->gso_type;
1936 
1937 		if (offload_type & SKB_GSO_TCPV4) {
1938 			real_len = (((unsigned char *)ip_hdr(skb) - skb->data)
1939 					+ ntohs(ip_hdr(skb)->tot_len));
1940 
1941 			if (real_len < skb->len)
1942 				pskb_trim(skb, real_len);
1943 
1944 			hdr_len = (skb_transport_offset(skb) + tcp_hdrlen(skb));
1945 			if (unlikely(skb->len == hdr_len)) {
1946 				/* only xsum need */
1947 				if (netif_msg_tx_queued(adapter))
1948 					dev_warn(&pdev->dev,
1949 						"IPV4 tso with zero data??\n");
1950 				goto check_sum;
1951 			} else {
1952 				ip_hdr(skb)->check = 0;
1953 				tcp_hdr(skb)->check = ~csum_tcpudp_magic(
1954 							ip_hdr(skb)->saddr,
1955 							ip_hdr(skb)->daddr,
1956 							0, IPPROTO_TCP, 0);
1957 				(*tpd)->word1 |= 1 << TPD_IPV4_PACKET_SHIFT;
1958 			}
1959 		}
1960 
1961 		if (offload_type & SKB_GSO_TCPV6) {
1962 			struct atl1c_tpd_ext_desc *etpd =
1963 				*(struct atl1c_tpd_ext_desc **)(tpd);
1964 
1965 			memset(etpd, 0, sizeof(struct atl1c_tpd_ext_desc));
1966 			*tpd = atl1c_get_tpd(adapter, type);
1967 			ipv6_hdr(skb)->payload_len = 0;
1968 			/* check payload == 0 byte ? */
1969 			hdr_len = (skb_transport_offset(skb) + tcp_hdrlen(skb));
1970 			if (unlikely(skb->len == hdr_len)) {
1971 				/* only xsum need */
1972 				if (netif_msg_tx_queued(adapter))
1973 					dev_warn(&pdev->dev,
1974 						"IPV6 tso with zero data??\n");
1975 				goto check_sum;
1976 			} else
1977 				tcp_hdr(skb)->check = ~csum_ipv6_magic(
1978 						&ipv6_hdr(skb)->saddr,
1979 						&ipv6_hdr(skb)->daddr,
1980 						0, IPPROTO_TCP, 0);
1981 			etpd->word1 |= 1 << TPD_LSO_EN_SHIFT;
1982 			etpd->word1 |= 1 << TPD_LSO_VER_SHIFT;
1983 			etpd->pkt_len = cpu_to_le32(skb->len);
1984 			(*tpd)->word1 |= 1 << TPD_LSO_VER_SHIFT;
1985 		}
1986 
1987 		(*tpd)->word1 |= 1 << TPD_LSO_EN_SHIFT;
1988 		(*tpd)->word1 |= (skb_transport_offset(skb) & TPD_TCPHDR_OFFSET_MASK) <<
1989 				TPD_TCPHDR_OFFSET_SHIFT;
1990 		(*tpd)->word1 |= (skb_shinfo(skb)->gso_size & TPD_MSS_MASK) <<
1991 				TPD_MSS_SHIFT;
1992 		return 0;
1993 	}
1994 
1995 check_sum:
1996 	if (likely(skb->ip_summed == CHECKSUM_PARTIAL)) {
1997 		u8 css, cso;
1998 		cso = skb_checksum_start_offset(skb);
1999 
2000 		if (unlikely(cso & 0x1)) {
2001 			if (netif_msg_tx_err(adapter))
2002 				dev_err(&adapter->pdev->dev,
2003 					"payload offset should not an event number\n");
2004 			return -1;
2005 		} else {
2006 			css = cso + skb->csum_offset;
2007 
2008 			(*tpd)->word1 |= ((cso >> 1) & TPD_PLOADOFFSET_MASK) <<
2009 					TPD_PLOADOFFSET_SHIFT;
2010 			(*tpd)->word1 |= ((css >> 1) & TPD_CCSUM_OFFSET_MASK) <<
2011 					TPD_CCSUM_OFFSET_SHIFT;
2012 			(*tpd)->word1 |= 1 << TPD_CCSUM_EN_SHIFT;
2013 		}
2014 	}
2015 	return 0;
2016 }
2017 
2018 static void atl1c_tx_map(struct atl1c_adapter *adapter,
2019 		      struct sk_buff *skb, struct atl1c_tpd_desc *tpd,
2020 			enum atl1c_trans_queue type)
2021 {
2022 	struct atl1c_tpd_desc *use_tpd = NULL;
2023 	struct atl1c_buffer *buffer_info = NULL;
2024 	u16 buf_len = skb_headlen(skb);
2025 	u16 map_len = 0;
2026 	u16 mapped_len = 0;
2027 	u16 hdr_len = 0;
2028 	u16 nr_frags;
2029 	u16 f;
2030 	int tso;
2031 
2032 	nr_frags = skb_shinfo(skb)->nr_frags;
2033 	tso = (tpd->word1 >> TPD_LSO_EN_SHIFT) & TPD_LSO_EN_MASK;
2034 	if (tso) {
2035 		/* TSO */
2036 		map_len = hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
2037 		use_tpd = tpd;
2038 
2039 		buffer_info = atl1c_get_tx_buffer(adapter, use_tpd);
2040 		buffer_info->length = map_len;
2041 		buffer_info->dma = pci_map_single(adapter->pdev,
2042 					skb->data, hdr_len, PCI_DMA_TODEVICE);
2043 		ATL1C_SET_BUFFER_STATE(buffer_info, ATL1C_BUFFER_BUSY);
2044 		ATL1C_SET_PCIMAP_TYPE(buffer_info, ATL1C_PCIMAP_SINGLE,
2045 			ATL1C_PCIMAP_TODEVICE);
2046 		mapped_len += map_len;
2047 		use_tpd->buffer_addr = cpu_to_le64(buffer_info->dma);
2048 		use_tpd->buffer_len = cpu_to_le16(buffer_info->length);
2049 	}
2050 
2051 	if (mapped_len < buf_len) {
2052 		/* mapped_len == 0, means we should use the first tpd,
2053 		   which is given by caller  */
2054 		if (mapped_len == 0)
2055 			use_tpd = tpd;
2056 		else {
2057 			use_tpd = atl1c_get_tpd(adapter, type);
2058 			memcpy(use_tpd, tpd, sizeof(struct atl1c_tpd_desc));
2059 		}
2060 		buffer_info = atl1c_get_tx_buffer(adapter, use_tpd);
2061 		buffer_info->length = buf_len - mapped_len;
2062 		buffer_info->dma =
2063 			pci_map_single(adapter->pdev, skb->data + mapped_len,
2064 					buffer_info->length, PCI_DMA_TODEVICE);
2065 		ATL1C_SET_BUFFER_STATE(buffer_info, ATL1C_BUFFER_BUSY);
2066 		ATL1C_SET_PCIMAP_TYPE(buffer_info, ATL1C_PCIMAP_SINGLE,
2067 			ATL1C_PCIMAP_TODEVICE);
2068 		use_tpd->buffer_addr = cpu_to_le64(buffer_info->dma);
2069 		use_tpd->buffer_len  = cpu_to_le16(buffer_info->length);
2070 	}
2071 
2072 	for (f = 0; f < nr_frags; f++) {
2073 		struct skb_frag_struct *frag;
2074 
2075 		frag = &skb_shinfo(skb)->frags[f];
2076 
2077 		use_tpd = atl1c_get_tpd(adapter, type);
2078 		memcpy(use_tpd, tpd, sizeof(struct atl1c_tpd_desc));
2079 
2080 		buffer_info = atl1c_get_tx_buffer(adapter, use_tpd);
2081 		buffer_info->length = skb_frag_size(frag);
2082 		buffer_info->dma = skb_frag_dma_map(&adapter->pdev->dev,
2083 						    frag, 0,
2084 						    buffer_info->length,
2085 						    DMA_TO_DEVICE);
2086 		ATL1C_SET_BUFFER_STATE(buffer_info, ATL1C_BUFFER_BUSY);
2087 		ATL1C_SET_PCIMAP_TYPE(buffer_info, ATL1C_PCIMAP_PAGE,
2088 			ATL1C_PCIMAP_TODEVICE);
2089 		use_tpd->buffer_addr = cpu_to_le64(buffer_info->dma);
2090 		use_tpd->buffer_len  = cpu_to_le16(buffer_info->length);
2091 	}
2092 
2093 	/* The last tpd */
2094 	use_tpd->word1 |= 1 << TPD_EOP_SHIFT;
2095 	/* The last buffer info contain the skb address,
2096 	   so it will be free after unmap */
2097 	buffer_info->skb = skb;
2098 }
2099 
2100 static void atl1c_tx_queue(struct atl1c_adapter *adapter, struct sk_buff *skb,
2101 			   struct atl1c_tpd_desc *tpd, enum atl1c_trans_queue type)
2102 {
2103 	struct atl1c_tpd_ring *tpd_ring = &adapter->tpd_ring[type];
2104 	u16 reg;
2105 
2106 	reg = type == atl1c_trans_high ? REG_TPD_PRI1_PIDX : REG_TPD_PRI0_PIDX;
2107 	AT_WRITE_REGW(&adapter->hw, reg, tpd_ring->next_to_use);
2108 }
2109 
2110 static netdev_tx_t atl1c_xmit_frame(struct sk_buff *skb,
2111 					  struct net_device *netdev)
2112 {
2113 	struct atl1c_adapter *adapter = netdev_priv(netdev);
2114 	unsigned long flags;
2115 	u16 tpd_req = 1;
2116 	struct atl1c_tpd_desc *tpd;
2117 	enum atl1c_trans_queue type = atl1c_trans_normal;
2118 
2119 	if (test_bit(__AT_DOWN, &adapter->flags)) {
2120 		dev_kfree_skb_any(skb);
2121 		return NETDEV_TX_OK;
2122 	}
2123 
2124 	tpd_req = atl1c_cal_tpd_req(skb);
2125 	if (!spin_trylock_irqsave(&adapter->tx_lock, flags)) {
2126 		if (netif_msg_pktdata(adapter))
2127 			dev_info(&adapter->pdev->dev, "tx locked\n");
2128 		return NETDEV_TX_LOCKED;
2129 	}
2130 
2131 	if (atl1c_tpd_avail(adapter, type) < tpd_req) {
2132 		/* no enough descriptor, just stop queue */
2133 		netif_stop_queue(netdev);
2134 		spin_unlock_irqrestore(&adapter->tx_lock, flags);
2135 		return NETDEV_TX_BUSY;
2136 	}
2137 
2138 	tpd = atl1c_get_tpd(adapter, type);
2139 
2140 	/* do TSO and check sum */
2141 	if (atl1c_tso_csum(adapter, skb, &tpd, type) != 0) {
2142 		spin_unlock_irqrestore(&adapter->tx_lock, flags);
2143 		dev_kfree_skb_any(skb);
2144 		return NETDEV_TX_OK;
2145 	}
2146 
2147 	if (unlikely(vlan_tx_tag_present(skb))) {
2148 		u16 vlan = vlan_tx_tag_get(skb);
2149 		__le16 tag;
2150 
2151 		vlan = cpu_to_le16(vlan);
2152 		AT_VLAN_TO_TAG(vlan, tag);
2153 		tpd->word1 |= 1 << TPD_INS_VTAG_SHIFT;
2154 		tpd->vlan_tag = tag;
2155 	}
2156 
2157 	if (skb_network_offset(skb) != ETH_HLEN)
2158 		tpd->word1 |= 1 << TPD_ETH_TYPE_SHIFT; /* Ethernet frame */
2159 
2160 	atl1c_tx_map(adapter, skb, tpd, type);
2161 	atl1c_tx_queue(adapter, skb, tpd, type);
2162 
2163 	spin_unlock_irqrestore(&adapter->tx_lock, flags);
2164 	return NETDEV_TX_OK;
2165 }
2166 
2167 static void atl1c_free_irq(struct atl1c_adapter *adapter)
2168 {
2169 	struct net_device *netdev = adapter->netdev;
2170 
2171 	free_irq(adapter->pdev->irq, netdev);
2172 
2173 	if (adapter->have_msi)
2174 		pci_disable_msi(adapter->pdev);
2175 }
2176 
2177 static int atl1c_request_irq(struct atl1c_adapter *adapter)
2178 {
2179 	struct pci_dev    *pdev   = adapter->pdev;
2180 	struct net_device *netdev = adapter->netdev;
2181 	int flags = 0;
2182 	int err = 0;
2183 
2184 	adapter->have_msi = true;
2185 	err = pci_enable_msi(adapter->pdev);
2186 	if (err) {
2187 		if (netif_msg_ifup(adapter))
2188 			dev_err(&pdev->dev,
2189 				"Unable to allocate MSI interrupt Error: %d\n",
2190 				err);
2191 		adapter->have_msi = false;
2192 	}
2193 
2194 	if (!adapter->have_msi)
2195 		flags |= IRQF_SHARED;
2196 	err = request_irq(adapter->pdev->irq, atl1c_intr, flags,
2197 			netdev->name, netdev);
2198 	if (err) {
2199 		if (netif_msg_ifup(adapter))
2200 			dev_err(&pdev->dev,
2201 				"Unable to allocate interrupt Error: %d\n",
2202 				err);
2203 		if (adapter->have_msi)
2204 			pci_disable_msi(adapter->pdev);
2205 		return err;
2206 	}
2207 	if (netif_msg_ifup(adapter))
2208 		dev_dbg(&pdev->dev, "atl1c_request_irq OK\n");
2209 	return err;
2210 }
2211 
2212 
2213 static void atl1c_reset_dma_ring(struct atl1c_adapter *adapter)
2214 {
2215 	/* release tx-pending skbs and reset tx/rx ring index */
2216 	atl1c_clean_tx_ring(adapter, atl1c_trans_normal);
2217 	atl1c_clean_tx_ring(adapter, atl1c_trans_high);
2218 	atl1c_clean_rx_ring(adapter);
2219 }
2220 
2221 static int atl1c_up(struct atl1c_adapter *adapter)
2222 {
2223 	struct net_device *netdev = adapter->netdev;
2224 	int err;
2225 
2226 	netif_carrier_off(netdev);
2227 
2228 	err = atl1c_configure(adapter);
2229 	if (unlikely(err))
2230 		goto err_up;
2231 
2232 	err = atl1c_request_irq(adapter);
2233 	if (unlikely(err))
2234 		goto err_up;
2235 
2236 	atl1c_check_link_status(adapter);
2237 	clear_bit(__AT_DOWN, &adapter->flags);
2238 	napi_enable(&adapter->napi);
2239 	atl1c_irq_enable(adapter);
2240 	netif_start_queue(netdev);
2241 	return err;
2242 
2243 err_up:
2244 	atl1c_clean_rx_ring(adapter);
2245 	return err;
2246 }
2247 
2248 static void atl1c_down(struct atl1c_adapter *adapter)
2249 {
2250 	struct net_device *netdev = adapter->netdev;
2251 
2252 	atl1c_del_timer(adapter);
2253 	adapter->work_event = 0; /* clear all event */
2254 	/* signal that we're down so the interrupt handler does not
2255 	 * reschedule our watchdog timer */
2256 	set_bit(__AT_DOWN, &adapter->flags);
2257 	netif_carrier_off(netdev);
2258 	napi_disable(&adapter->napi);
2259 	atl1c_irq_disable(adapter);
2260 	atl1c_free_irq(adapter);
2261 	/* disable ASPM if device inactive */
2262 	atl1c_disable_l0s_l1(&adapter->hw);
2263 	/* reset MAC to disable all RX/TX */
2264 	atl1c_reset_mac(&adapter->hw);
2265 	msleep(1);
2266 
2267 	adapter->link_speed = SPEED_0;
2268 	adapter->link_duplex = -1;
2269 	atl1c_reset_dma_ring(adapter);
2270 }
2271 
2272 /**
2273  * atl1c_open - Called when a network interface is made active
2274  * @netdev: network interface device structure
2275  *
2276  * Returns 0 on success, negative value on failure
2277  *
2278  * The open entry point is called when a network interface is made
2279  * active by the system (IFF_UP).  At this point all resources needed
2280  * for transmit and receive operations are allocated, the interrupt
2281  * handler is registered with the OS, the watchdog timer is started,
2282  * and the stack is notified that the interface is ready.
2283  */
2284 static int atl1c_open(struct net_device *netdev)
2285 {
2286 	struct atl1c_adapter *adapter = netdev_priv(netdev);
2287 	int err;
2288 
2289 	/* disallow open during test */
2290 	if (test_bit(__AT_TESTING, &adapter->flags))
2291 		return -EBUSY;
2292 
2293 	/* allocate rx/tx dma buffer & descriptors */
2294 	err = atl1c_setup_ring_resources(adapter);
2295 	if (unlikely(err))
2296 		return err;
2297 
2298 	err = atl1c_up(adapter);
2299 	if (unlikely(err))
2300 		goto err_up;
2301 
2302 	return 0;
2303 
2304 err_up:
2305 	atl1c_free_irq(adapter);
2306 	atl1c_free_ring_resources(adapter);
2307 	atl1c_reset_mac(&adapter->hw);
2308 	return err;
2309 }
2310 
2311 /**
2312  * atl1c_close - Disables a network interface
2313  * @netdev: network interface device structure
2314  *
2315  * Returns 0, this is not allowed to fail
2316  *
2317  * The close entry point is called when an interface is de-activated
2318  * by the OS.  The hardware is still under the drivers control, but
2319  * needs to be disabled.  A global MAC reset is issued to stop the
2320  * hardware, and all transmit and receive resources are freed.
2321  */
2322 static int atl1c_close(struct net_device *netdev)
2323 {
2324 	struct atl1c_adapter *adapter = netdev_priv(netdev);
2325 
2326 	WARN_ON(test_bit(__AT_RESETTING, &adapter->flags));
2327 	set_bit(__AT_DOWN, &adapter->flags);
2328 	cancel_work_sync(&adapter->common_task);
2329 	atl1c_down(adapter);
2330 	atl1c_free_ring_resources(adapter);
2331 	return 0;
2332 }
2333 
2334 static int atl1c_suspend(struct device *dev)
2335 {
2336 	struct pci_dev *pdev = to_pci_dev(dev);
2337 	struct net_device *netdev = pci_get_drvdata(pdev);
2338 	struct atl1c_adapter *adapter = netdev_priv(netdev);
2339 	struct atl1c_hw *hw = &adapter->hw;
2340 	u32 wufc = adapter->wol;
2341 
2342 	atl1c_disable_l0s_l1(hw);
2343 	if (netif_running(netdev)) {
2344 		WARN_ON(test_bit(__AT_RESETTING, &adapter->flags));
2345 		atl1c_down(adapter);
2346 	}
2347 	netif_device_detach(netdev);
2348 
2349 	if (wufc)
2350 		if (atl1c_phy_to_ps_link(hw) != 0)
2351 			dev_dbg(&pdev->dev, "phy power saving failed");
2352 
2353 	atl1c_power_saving(hw, wufc);
2354 
2355 	return 0;
2356 }
2357 
2358 #ifdef CONFIG_PM_SLEEP
2359 static int atl1c_resume(struct device *dev)
2360 {
2361 	struct pci_dev *pdev = to_pci_dev(dev);
2362 	struct net_device *netdev = pci_get_drvdata(pdev);
2363 	struct atl1c_adapter *adapter = netdev_priv(netdev);
2364 
2365 	AT_WRITE_REG(&adapter->hw, REG_WOL_CTRL, 0);
2366 	atl1c_reset_pcie(&adapter->hw, ATL1C_PCIE_L0S_L1_DISABLE);
2367 
2368 	atl1c_phy_reset(&adapter->hw);
2369 	atl1c_reset_mac(&adapter->hw);
2370 	atl1c_phy_init(&adapter->hw);
2371 
2372 #if 0
2373 	AT_READ_REG(&adapter->hw, REG_PM_CTRLSTAT, &pm_data);
2374 	pm_data &= ~PM_CTRLSTAT_PME_EN;
2375 	AT_WRITE_REG(&adapter->hw, REG_PM_CTRLSTAT, pm_data);
2376 #endif
2377 
2378 	netif_device_attach(netdev);
2379 	if (netif_running(netdev))
2380 		atl1c_up(adapter);
2381 
2382 	return 0;
2383 }
2384 #endif
2385 
2386 static void atl1c_shutdown(struct pci_dev *pdev)
2387 {
2388 	struct net_device *netdev = pci_get_drvdata(pdev);
2389 	struct atl1c_adapter *adapter = netdev_priv(netdev);
2390 
2391 	atl1c_suspend(&pdev->dev);
2392 	pci_wake_from_d3(pdev, adapter->wol);
2393 	pci_set_power_state(pdev, PCI_D3hot);
2394 }
2395 
2396 static const struct net_device_ops atl1c_netdev_ops = {
2397 	.ndo_open		= atl1c_open,
2398 	.ndo_stop		= atl1c_close,
2399 	.ndo_validate_addr	= eth_validate_addr,
2400 	.ndo_start_xmit		= atl1c_xmit_frame,
2401 	.ndo_set_mac_address	= atl1c_set_mac_addr,
2402 	.ndo_set_rx_mode	= atl1c_set_multi,
2403 	.ndo_change_mtu		= atl1c_change_mtu,
2404 	.ndo_fix_features	= atl1c_fix_features,
2405 	.ndo_set_features	= atl1c_set_features,
2406 	.ndo_do_ioctl		= atl1c_ioctl,
2407 	.ndo_tx_timeout		= atl1c_tx_timeout,
2408 	.ndo_get_stats		= atl1c_get_stats,
2409 #ifdef CONFIG_NET_POLL_CONTROLLER
2410 	.ndo_poll_controller	= atl1c_netpoll,
2411 #endif
2412 };
2413 
2414 static int atl1c_init_netdev(struct net_device *netdev, struct pci_dev *pdev)
2415 {
2416 	SET_NETDEV_DEV(netdev, &pdev->dev);
2417 	pci_set_drvdata(pdev, netdev);
2418 
2419 	netdev->netdev_ops = &atl1c_netdev_ops;
2420 	netdev->watchdog_timeo = AT_TX_WATCHDOG;
2421 	atl1c_set_ethtool_ops(netdev);
2422 
2423 	/* TODO: add when ready */
2424 	netdev->hw_features =	NETIF_F_SG	   |
2425 				NETIF_F_HW_CSUM	   |
2426 				NETIF_F_HW_VLAN_RX |
2427 				NETIF_F_TSO	   |
2428 				NETIF_F_TSO6;
2429 	netdev->features =	netdev->hw_features |
2430 				NETIF_F_HW_VLAN_TX;
2431 	return 0;
2432 }
2433 
2434 /**
2435  * atl1c_probe - Device Initialization Routine
2436  * @pdev: PCI device information struct
2437  * @ent: entry in atl1c_pci_tbl
2438  *
2439  * Returns 0 on success, negative on failure
2440  *
2441  * atl1c_probe initializes an adapter identified by a pci_dev structure.
2442  * The OS initialization, configuring of the adapter private structure,
2443  * and a hardware reset occur.
2444  */
2445 static int __devinit atl1c_probe(struct pci_dev *pdev,
2446 				 const struct pci_device_id *ent)
2447 {
2448 	struct net_device *netdev;
2449 	struct atl1c_adapter *adapter;
2450 	static int cards_found;
2451 
2452 	int err = 0;
2453 
2454 	/* enable device (incl. PCI PM wakeup and hotplug setup) */
2455 	err = pci_enable_device_mem(pdev);
2456 	if (err) {
2457 		dev_err(&pdev->dev, "cannot enable PCI device\n");
2458 		return err;
2459 	}
2460 
2461 	/*
2462 	 * The atl1c chip can DMA to 64-bit addresses, but it uses a single
2463 	 * shared register for the high 32 bits, so only a single, aligned,
2464 	 * 4 GB physical address range can be used at a time.
2465 	 *
2466 	 * Supporting 64-bit DMA on this hardware is more trouble than it's
2467 	 * worth.  It is far easier to limit to 32-bit DMA than update
2468 	 * various kernel subsystems to support the mechanics required by a
2469 	 * fixed-high-32-bit system.
2470 	 */
2471 	if ((pci_set_dma_mask(pdev, DMA_BIT_MASK(32)) != 0) ||
2472 	    (pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32)) != 0)) {
2473 		dev_err(&pdev->dev, "No usable DMA configuration,aborting\n");
2474 		goto err_dma;
2475 	}
2476 
2477 	err = pci_request_regions(pdev, atl1c_driver_name);
2478 	if (err) {
2479 		dev_err(&pdev->dev, "cannot obtain PCI resources\n");
2480 		goto err_pci_reg;
2481 	}
2482 
2483 	pci_set_master(pdev);
2484 
2485 	netdev = alloc_etherdev(sizeof(struct atl1c_adapter));
2486 	if (netdev == NULL) {
2487 		err = -ENOMEM;
2488 		goto err_alloc_etherdev;
2489 	}
2490 
2491 	err = atl1c_init_netdev(netdev, pdev);
2492 	if (err) {
2493 		dev_err(&pdev->dev, "init netdevice failed\n");
2494 		goto err_init_netdev;
2495 	}
2496 	adapter = netdev_priv(netdev);
2497 	adapter->bd_number = cards_found;
2498 	adapter->netdev = netdev;
2499 	adapter->pdev = pdev;
2500 	adapter->hw.adapter = adapter;
2501 	adapter->msg_enable = netif_msg_init(-1, atl1c_default_msg);
2502 	adapter->hw.hw_addr = ioremap(pci_resource_start(pdev, 0), pci_resource_len(pdev, 0));
2503 	if (!adapter->hw.hw_addr) {
2504 		err = -EIO;
2505 		dev_err(&pdev->dev, "cannot map device registers\n");
2506 		goto err_ioremap;
2507 	}
2508 
2509 	/* init mii data */
2510 	adapter->mii.dev = netdev;
2511 	adapter->mii.mdio_read  = atl1c_mdio_read;
2512 	adapter->mii.mdio_write = atl1c_mdio_write;
2513 	adapter->mii.phy_id_mask = 0x1f;
2514 	adapter->mii.reg_num_mask = MDIO_CTRL_REG_MASK;
2515 	netif_napi_add(netdev, &adapter->napi, atl1c_clean, 64);
2516 	setup_timer(&adapter->phy_config_timer, atl1c_phy_config,
2517 			(unsigned long)adapter);
2518 	/* setup the private structure */
2519 	err = atl1c_sw_init(adapter);
2520 	if (err) {
2521 		dev_err(&pdev->dev, "net device private data init failed\n");
2522 		goto err_sw_init;
2523 	}
2524 	atl1c_reset_pcie(&adapter->hw, ATL1C_PCIE_L0S_L1_DISABLE);
2525 
2526 	/* Init GPHY as early as possible due to power saving issue  */
2527 	atl1c_phy_reset(&adapter->hw);
2528 
2529 	err = atl1c_reset_mac(&adapter->hw);
2530 	if (err) {
2531 		err = -EIO;
2532 		goto err_reset;
2533 	}
2534 
2535 	/* reset the controller to
2536 	 * put the device in a known good starting state */
2537 	err = atl1c_phy_init(&adapter->hw);
2538 	if (err) {
2539 		err = -EIO;
2540 		goto err_reset;
2541 	}
2542 	if (atl1c_read_mac_addr(&adapter->hw)) {
2543 		/* got a random MAC address, set NET_ADDR_RANDOM to netdev */
2544 		netdev->addr_assign_type |= NET_ADDR_RANDOM;
2545 	}
2546 	memcpy(netdev->dev_addr, adapter->hw.mac_addr, netdev->addr_len);
2547 	memcpy(netdev->perm_addr, adapter->hw.mac_addr, netdev->addr_len);
2548 	if (netif_msg_probe(adapter))
2549 		dev_dbg(&pdev->dev, "mac address : %pM\n",
2550 			adapter->hw.mac_addr);
2551 
2552 	atl1c_hw_set_mac_addr(&adapter->hw, adapter->hw.mac_addr);
2553 	INIT_WORK(&adapter->common_task, atl1c_common_task);
2554 	adapter->work_event = 0;
2555 	err = register_netdev(netdev);
2556 	if (err) {
2557 		dev_err(&pdev->dev, "register netdevice failed\n");
2558 		goto err_register;
2559 	}
2560 
2561 	if (netif_msg_probe(adapter))
2562 		dev_info(&pdev->dev, "version %s\n", ATL1C_DRV_VERSION);
2563 	cards_found++;
2564 	return 0;
2565 
2566 err_reset:
2567 err_register:
2568 err_sw_init:
2569 	iounmap(adapter->hw.hw_addr);
2570 err_init_netdev:
2571 err_ioremap:
2572 	free_netdev(netdev);
2573 err_alloc_etherdev:
2574 	pci_release_regions(pdev);
2575 err_pci_reg:
2576 err_dma:
2577 	pci_disable_device(pdev);
2578 	return err;
2579 }
2580 
2581 /**
2582  * atl1c_remove - Device Removal Routine
2583  * @pdev: PCI device information struct
2584  *
2585  * atl1c_remove is called by the PCI subsystem to alert the driver
2586  * that it should release a PCI device.  The could be caused by a
2587  * Hot-Plug event, or because the driver is going to be removed from
2588  * memory.
2589  */
2590 static void __devexit atl1c_remove(struct pci_dev *pdev)
2591 {
2592 	struct net_device *netdev = pci_get_drvdata(pdev);
2593 	struct atl1c_adapter *adapter = netdev_priv(netdev);
2594 
2595 	unregister_netdev(netdev);
2596 	/* restore permanent address */
2597 	atl1c_hw_set_mac_addr(&adapter->hw, adapter->hw.perm_mac_addr);
2598 	atl1c_phy_disable(&adapter->hw);
2599 
2600 	iounmap(adapter->hw.hw_addr);
2601 
2602 	pci_release_regions(pdev);
2603 	pci_disable_device(pdev);
2604 	free_netdev(netdev);
2605 }
2606 
2607 /**
2608  * atl1c_io_error_detected - called when PCI error is detected
2609  * @pdev: Pointer to PCI device
2610  * @state: The current pci connection state
2611  *
2612  * This function is called after a PCI bus error affecting
2613  * this device has been detected.
2614  */
2615 static pci_ers_result_t atl1c_io_error_detected(struct pci_dev *pdev,
2616 						pci_channel_state_t state)
2617 {
2618 	struct net_device *netdev = pci_get_drvdata(pdev);
2619 	struct atl1c_adapter *adapter = netdev_priv(netdev);
2620 
2621 	netif_device_detach(netdev);
2622 
2623 	if (state == pci_channel_io_perm_failure)
2624 		return PCI_ERS_RESULT_DISCONNECT;
2625 
2626 	if (netif_running(netdev))
2627 		atl1c_down(adapter);
2628 
2629 	pci_disable_device(pdev);
2630 
2631 	/* Request a slot slot reset. */
2632 	return PCI_ERS_RESULT_NEED_RESET;
2633 }
2634 
2635 /**
2636  * atl1c_io_slot_reset - called after the pci bus has been reset.
2637  * @pdev: Pointer to PCI device
2638  *
2639  * Restart the card from scratch, as if from a cold-boot. Implementation
2640  * resembles the first-half of the e1000_resume routine.
2641  */
2642 static pci_ers_result_t atl1c_io_slot_reset(struct pci_dev *pdev)
2643 {
2644 	struct net_device *netdev = pci_get_drvdata(pdev);
2645 	struct atl1c_adapter *adapter = netdev_priv(netdev);
2646 
2647 	if (pci_enable_device(pdev)) {
2648 		if (netif_msg_hw(adapter))
2649 			dev_err(&pdev->dev,
2650 				"Cannot re-enable PCI device after reset\n");
2651 		return PCI_ERS_RESULT_DISCONNECT;
2652 	}
2653 	pci_set_master(pdev);
2654 
2655 	pci_enable_wake(pdev, PCI_D3hot, 0);
2656 	pci_enable_wake(pdev, PCI_D3cold, 0);
2657 
2658 	atl1c_reset_mac(&adapter->hw);
2659 
2660 	return PCI_ERS_RESULT_RECOVERED;
2661 }
2662 
2663 /**
2664  * atl1c_io_resume - called when traffic can start flowing again.
2665  * @pdev: Pointer to PCI device
2666  *
2667  * This callback is called when the error recovery driver tells us that
2668  * its OK to resume normal operation. Implementation resembles the
2669  * second-half of the atl1c_resume routine.
2670  */
2671 static void atl1c_io_resume(struct pci_dev *pdev)
2672 {
2673 	struct net_device *netdev = pci_get_drvdata(pdev);
2674 	struct atl1c_adapter *adapter = netdev_priv(netdev);
2675 
2676 	if (netif_running(netdev)) {
2677 		if (atl1c_up(adapter)) {
2678 			if (netif_msg_hw(adapter))
2679 				dev_err(&pdev->dev,
2680 					"Cannot bring device back up after reset\n");
2681 			return;
2682 		}
2683 	}
2684 
2685 	netif_device_attach(netdev);
2686 }
2687 
2688 static const struct pci_error_handlers atl1c_err_handler = {
2689 	.error_detected = atl1c_io_error_detected,
2690 	.slot_reset = atl1c_io_slot_reset,
2691 	.resume = atl1c_io_resume,
2692 };
2693 
2694 static SIMPLE_DEV_PM_OPS(atl1c_pm_ops, atl1c_suspend, atl1c_resume);
2695 
2696 static struct pci_driver atl1c_driver = {
2697 	.name     = atl1c_driver_name,
2698 	.id_table = atl1c_pci_tbl,
2699 	.probe    = atl1c_probe,
2700 	.remove   = __devexit_p(atl1c_remove),
2701 	.shutdown = atl1c_shutdown,
2702 	.err_handler = &atl1c_err_handler,
2703 	.driver.pm = &atl1c_pm_ops,
2704 };
2705 
2706 /**
2707  * atl1c_init_module - Driver Registration Routine
2708  *
2709  * atl1c_init_module is the first routine called when the driver is
2710  * loaded. All it does is register with the PCI subsystem.
2711  */
2712 static int __init atl1c_init_module(void)
2713 {
2714 	return pci_register_driver(&atl1c_driver);
2715 }
2716 
2717 /**
2718  * atl1c_exit_module - Driver Exit Cleanup Routine
2719  *
2720  * atl1c_exit_module is called just before the driver is removed
2721  * from memory.
2722  */
2723 static void __exit atl1c_exit_module(void)
2724 {
2725 	pci_unregister_driver(&atl1c_driver);
2726 }
2727 
2728 module_init(atl1c_init_module);
2729 module_exit(atl1c_exit_module);
2730