1 /*
2  * Copyright(c) 2008 - 2009 Atheros Corporation. All rights reserved.
3  *
4  * Derived from Intel e1000 driver
5  * Copyright(c) 1999 - 2005 Intel Corporation. All rights reserved.
6  *
7  * This program is free software; you can redistribute it and/or modify it
8  * under the terms of the GNU General Public License as published by the Free
9  * Software Foundation; either version 2 of the License, or (at your option)
10  * any later version.
11  *
12  * This program is distributed in the hope that it will be useful, but WITHOUT
13  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
14  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
15  * more details.
16  *
17  * You should have received a copy of the GNU General Public License along with
18  * this program; if not, write to the Free Software Foundation, Inc., 59
19  * Temple Place - Suite 330, Boston, MA  02111-1307, USA.
20  */
21 
22 #include "atl1c.h"
23 
24 #define ATL1C_DRV_VERSION "1.0.1.1-NAPI"
25 char atl1c_driver_name[] = "atl1c";
26 char atl1c_driver_version[] = ATL1C_DRV_VERSION;
27 
28 /*
29  * atl1c_pci_tbl - PCI Device ID Table
30  *
31  * Wildcard entries (PCI_ANY_ID) should come last
32  * Last entry must be all 0s
33  *
34  * { Vendor ID, Device ID, SubVendor ID, SubDevice ID,
35  *   Class, Class Mask, private data (not used) }
36  */
37 static const struct pci_device_id atl1c_pci_tbl[] = {
38 	{PCI_DEVICE(PCI_VENDOR_ID_ATTANSIC, PCI_DEVICE_ID_ATTANSIC_L1C)},
39 	{PCI_DEVICE(PCI_VENDOR_ID_ATTANSIC, PCI_DEVICE_ID_ATTANSIC_L2C)},
40 	{PCI_DEVICE(PCI_VENDOR_ID_ATTANSIC, PCI_DEVICE_ID_ATHEROS_L2C_B)},
41 	{PCI_DEVICE(PCI_VENDOR_ID_ATTANSIC, PCI_DEVICE_ID_ATHEROS_L2C_B2)},
42 	{PCI_DEVICE(PCI_VENDOR_ID_ATTANSIC, PCI_DEVICE_ID_ATHEROS_L1D)},
43 	{PCI_DEVICE(PCI_VENDOR_ID_ATTANSIC, PCI_DEVICE_ID_ATHEROS_L1D_2_0)},
44 	/* required last entry */
45 	{ 0 }
46 };
47 MODULE_DEVICE_TABLE(pci, atl1c_pci_tbl);
48 
49 MODULE_AUTHOR("Jie Yang");
50 MODULE_AUTHOR("Qualcomm Atheros Inc., <nic-devel@qualcomm.com>");
51 MODULE_DESCRIPTION("Qualcomm Atheros 100/1000M Ethernet Network Driver");
52 MODULE_LICENSE("GPL");
53 MODULE_VERSION(ATL1C_DRV_VERSION);
54 
55 static int atl1c_stop_mac(struct atl1c_hw *hw);
56 static void atl1c_disable_l0s_l1(struct atl1c_hw *hw);
57 static void atl1c_set_aspm(struct atl1c_hw *hw, u16 link_speed);
58 static void atl1c_start_mac(struct atl1c_adapter *adapter);
59 static void atl1c_clean_rx_irq(struct atl1c_adapter *adapter,
60 		   int *work_done, int work_to_do);
61 static int atl1c_up(struct atl1c_adapter *adapter);
62 static void atl1c_down(struct atl1c_adapter *adapter);
63 static int atl1c_reset_mac(struct atl1c_hw *hw);
64 static void atl1c_reset_dma_ring(struct atl1c_adapter *adapter);
65 static int atl1c_configure(struct atl1c_adapter *adapter);
66 static int atl1c_alloc_rx_buffer(struct atl1c_adapter *adapter);
67 
68 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 	if (pos) {
149 		pci_read_config_dword(pdev, pos + PCI_ERR_UNCOR_SEVER, &data);
150 		data &= ~(PCI_ERR_UNC_DLP | PCI_ERR_UNC_FCP);
151 		pci_write_config_dword(pdev, pos + PCI_ERR_UNCOR_SEVER, data);
152 	}
153 	/* clear error status */
154 	pcie_capability_write_word(pdev, PCI_EXP_DEVSTA,
155 			PCI_EXP_DEVSTA_NFED |
156 			PCI_EXP_DEVSTA_FED |
157 			PCI_EXP_DEVSTA_CED |
158 			PCI_EXP_DEVSTA_URD);
159 
160 	AT_READ_REG(hw, REG_LTSSM_ID_CTRL, &data);
161 	data &= ~LTSSM_ID_EN_WRO;
162 	AT_WRITE_REG(hw, REG_LTSSM_ID_CTRL, data);
163 
164 	atl1c_pcie_patch(hw);
165 	if (flag & ATL1C_PCIE_L0S_L1_DISABLE)
166 		atl1c_disable_l0s_l1(hw);
167 
168 	msleep(5);
169 }
170 
171 /**
172  * atl1c_irq_enable - Enable default interrupt generation settings
173  * @adapter: board private structure
174  */
175 static inline void atl1c_irq_enable(struct atl1c_adapter *adapter)
176 {
177 	if (likely(atomic_dec_and_test(&adapter->irq_sem))) {
178 		AT_WRITE_REG(&adapter->hw, REG_ISR, 0x7FFFFFFF);
179 		AT_WRITE_REG(&adapter->hw, REG_IMR, adapter->hw.intr_mask);
180 		AT_WRITE_FLUSH(&adapter->hw);
181 	}
182 }
183 
184 /**
185  * atl1c_irq_disable - Mask off interrupt generation on the NIC
186  * @adapter: board private structure
187  */
188 static inline void atl1c_irq_disable(struct atl1c_adapter *adapter)
189 {
190 	atomic_inc(&adapter->irq_sem);
191 	AT_WRITE_REG(&adapter->hw, REG_IMR, 0);
192 	AT_WRITE_REG(&adapter->hw, REG_ISR, ISR_DIS_INT);
193 	AT_WRITE_FLUSH(&adapter->hw);
194 	synchronize_irq(adapter->pdev->irq);
195 }
196 
197 /**
198  * atl1c_irq_reset - reset interrupt confiure on the NIC
199  * @adapter: board private structure
200  */
201 static inline void atl1c_irq_reset(struct atl1c_adapter *adapter)
202 {
203 	atomic_set(&adapter->irq_sem, 1);
204 	atl1c_irq_enable(adapter);
205 }
206 
207 /*
208  * atl1c_wait_until_idle - wait up to AT_HW_MAX_IDLE_DELAY reads
209  * of the idle status register until the device is actually idle
210  */
211 static u32 atl1c_wait_until_idle(struct atl1c_hw *hw, u32 modu_ctrl)
212 {
213 	int timeout;
214 	u32 data;
215 
216 	for (timeout = 0; timeout < AT_HW_MAX_IDLE_DELAY; timeout++) {
217 		AT_READ_REG(hw, REG_IDLE_STATUS, &data);
218 		if ((data & modu_ctrl) == 0)
219 			return 0;
220 		msleep(1);
221 	}
222 	return data;
223 }
224 
225 /**
226  * atl1c_phy_config - Timer Call-back
227  * @data: pointer to netdev cast into an unsigned long
228  */
229 static void atl1c_phy_config(unsigned long data)
230 {
231 	struct atl1c_adapter *adapter = (struct atl1c_adapter *) data;
232 	struct atl1c_hw *hw = &adapter->hw;
233 	unsigned long flags;
234 
235 	spin_lock_irqsave(&adapter->mdio_lock, flags);
236 	atl1c_restart_autoneg(hw);
237 	spin_unlock_irqrestore(&adapter->mdio_lock, flags);
238 }
239 
240 void atl1c_reinit_locked(struct atl1c_adapter *adapter)
241 {
242 	WARN_ON(in_interrupt());
243 	atl1c_down(adapter);
244 	atl1c_up(adapter);
245 	clear_bit(__AT_RESETTING, &adapter->flags);
246 }
247 
248 static void atl1c_check_link_status(struct atl1c_adapter *adapter)
249 {
250 	struct atl1c_hw *hw = &adapter->hw;
251 	struct net_device *netdev = adapter->netdev;
252 	struct pci_dev    *pdev   = adapter->pdev;
253 	int err;
254 	unsigned long flags;
255 	u16 speed, duplex, phy_data;
256 
257 	spin_lock_irqsave(&adapter->mdio_lock, flags);
258 	/* MII_BMSR must read twise */
259 	atl1c_read_phy_reg(hw, MII_BMSR, &phy_data);
260 	atl1c_read_phy_reg(hw, MII_BMSR, &phy_data);
261 	spin_unlock_irqrestore(&adapter->mdio_lock, flags);
262 
263 	if ((phy_data & BMSR_LSTATUS) == 0) {
264 		/* link down */
265 		netif_carrier_off(netdev);
266 		hw->hibernate = true;
267 		if (atl1c_reset_mac(hw) != 0)
268 			if (netif_msg_hw(adapter))
269 				dev_warn(&pdev->dev, "reset mac failed\n");
270 		atl1c_set_aspm(hw, SPEED_0);
271 		atl1c_post_phy_linkchg(hw, SPEED_0);
272 		atl1c_reset_dma_ring(adapter);
273 		atl1c_configure(adapter);
274 	} else {
275 		/* Link Up */
276 		hw->hibernate = false;
277 		spin_lock_irqsave(&adapter->mdio_lock, flags);
278 		err = atl1c_get_speed_and_duplex(hw, &speed, &duplex);
279 		spin_unlock_irqrestore(&adapter->mdio_lock, flags);
280 		if (unlikely(err))
281 			return;
282 		/* link result is our setting */
283 		if (adapter->link_speed != speed ||
284 		    adapter->link_duplex != duplex) {
285 			adapter->link_speed  = speed;
286 			adapter->link_duplex = duplex;
287 			atl1c_set_aspm(hw, speed);
288 			atl1c_post_phy_linkchg(hw, speed);
289 			atl1c_start_mac(adapter);
290 			if (netif_msg_link(adapter))
291 				dev_info(&pdev->dev,
292 					"%s: %s NIC Link is Up<%d Mbps %s>\n",
293 					atl1c_driver_name, netdev->name,
294 					adapter->link_speed,
295 					adapter->link_duplex == FULL_DUPLEX ?
296 					"Full Duplex" : "Half Duplex");
297 		}
298 		if (!netif_carrier_ok(netdev))
299 			netif_carrier_on(netdev);
300 	}
301 }
302 
303 static void atl1c_link_chg_event(struct atl1c_adapter *adapter)
304 {
305 	struct net_device *netdev = adapter->netdev;
306 	struct pci_dev    *pdev   = adapter->pdev;
307 	u16 phy_data;
308 	u16 link_up;
309 
310 	spin_lock(&adapter->mdio_lock);
311 	atl1c_read_phy_reg(&adapter->hw, MII_BMSR, &phy_data);
312 	atl1c_read_phy_reg(&adapter->hw, MII_BMSR, &phy_data);
313 	spin_unlock(&adapter->mdio_lock);
314 	link_up = phy_data & BMSR_LSTATUS;
315 	/* notify upper layer link down ASAP */
316 	if (!link_up) {
317 		if (netif_carrier_ok(netdev)) {
318 			/* old link state: Up */
319 			netif_carrier_off(netdev);
320 			if (netif_msg_link(adapter))
321 				dev_info(&pdev->dev,
322 					"%s: %s NIC Link is Down\n",
323 					atl1c_driver_name, netdev->name);
324 			adapter->link_speed = SPEED_0;
325 		}
326 	}
327 
328 	set_bit(ATL1C_WORK_EVENT_LINK_CHANGE, &adapter->work_event);
329 	schedule_work(&adapter->common_task);
330 }
331 
332 static void atl1c_common_task(struct work_struct *work)
333 {
334 	struct atl1c_adapter *adapter;
335 	struct net_device *netdev;
336 
337 	adapter = container_of(work, struct atl1c_adapter, common_task);
338 	netdev = adapter->netdev;
339 
340 	if (test_bit(__AT_DOWN, &adapter->flags))
341 		return;
342 
343 	if (test_and_clear_bit(ATL1C_WORK_EVENT_RESET, &adapter->work_event)) {
344 		netif_device_detach(netdev);
345 		atl1c_down(adapter);
346 		atl1c_up(adapter);
347 		netif_device_attach(netdev);
348 	}
349 
350 	if (test_and_clear_bit(ATL1C_WORK_EVENT_LINK_CHANGE,
351 		&adapter->work_event)) {
352 		atl1c_irq_disable(adapter);
353 		atl1c_check_link_status(adapter);
354 		atl1c_irq_enable(adapter);
355 	}
356 }
357 
358 
359 static void atl1c_del_timer(struct atl1c_adapter *adapter)
360 {
361 	del_timer_sync(&adapter->phy_config_timer);
362 }
363 
364 
365 /**
366  * atl1c_tx_timeout - Respond to a Tx Hang
367  * @netdev: network interface device structure
368  */
369 static void atl1c_tx_timeout(struct net_device *netdev)
370 {
371 	struct atl1c_adapter *adapter = netdev_priv(netdev);
372 
373 	/* Do the reset outside of interrupt context */
374 	set_bit(ATL1C_WORK_EVENT_RESET, &adapter->work_event);
375 	schedule_work(&adapter->common_task);
376 }
377 
378 /**
379  * atl1c_set_multi - Multicast and Promiscuous mode set
380  * @netdev: network interface device structure
381  *
382  * The set_multi entry point is called whenever the multicast address
383  * list or the network interface flags are updated.  This routine is
384  * responsible for configuring the hardware for proper multicast,
385  * promiscuous mode, and all-multi behavior.
386  */
387 static void atl1c_set_multi(struct net_device *netdev)
388 {
389 	struct atl1c_adapter *adapter = netdev_priv(netdev);
390 	struct atl1c_hw *hw = &adapter->hw;
391 	struct netdev_hw_addr *ha;
392 	u32 mac_ctrl_data;
393 	u32 hash_value;
394 
395 	/* Check for Promiscuous and All Multicast modes */
396 	AT_READ_REG(hw, REG_MAC_CTRL, &mac_ctrl_data);
397 
398 	if (netdev->flags & IFF_PROMISC) {
399 		mac_ctrl_data |= MAC_CTRL_PROMIS_EN;
400 	} else if (netdev->flags & IFF_ALLMULTI) {
401 		mac_ctrl_data |= MAC_CTRL_MC_ALL_EN;
402 		mac_ctrl_data &= ~MAC_CTRL_PROMIS_EN;
403 	} else {
404 		mac_ctrl_data &= ~(MAC_CTRL_PROMIS_EN | MAC_CTRL_MC_ALL_EN);
405 	}
406 
407 	AT_WRITE_REG(hw, REG_MAC_CTRL, mac_ctrl_data);
408 
409 	/* clear the old settings from the multicast hash table */
410 	AT_WRITE_REG(hw, REG_RX_HASH_TABLE, 0);
411 	AT_WRITE_REG_ARRAY(hw, REG_RX_HASH_TABLE, 1, 0);
412 
413 	/* comoute mc addresses' hash value ,and put it into hash table */
414 	netdev_for_each_mc_addr(ha, netdev) {
415 		hash_value = atl1c_hash_mc_addr(hw, ha->addr);
416 		atl1c_hash_set(hw, hash_value);
417 	}
418 }
419 
420 static void __atl1c_vlan_mode(netdev_features_t features, u32 *mac_ctrl_data)
421 {
422 	if (features & NETIF_F_HW_VLAN_CTAG_RX) {
423 		/* enable VLAN tag insert/strip */
424 		*mac_ctrl_data |= MAC_CTRL_RMV_VLAN;
425 	} else {
426 		/* disable VLAN tag insert/strip */
427 		*mac_ctrl_data &= ~MAC_CTRL_RMV_VLAN;
428 	}
429 }
430 
431 static void atl1c_vlan_mode(struct net_device *netdev,
432 	netdev_features_t features)
433 {
434 	struct atl1c_adapter *adapter = netdev_priv(netdev);
435 	struct pci_dev *pdev = adapter->pdev;
436 	u32 mac_ctrl_data = 0;
437 
438 	if (netif_msg_pktdata(adapter))
439 		dev_dbg(&pdev->dev, "atl1c_vlan_mode\n");
440 
441 	atl1c_irq_disable(adapter);
442 	AT_READ_REG(&adapter->hw, REG_MAC_CTRL, &mac_ctrl_data);
443 	__atl1c_vlan_mode(features, &mac_ctrl_data);
444 	AT_WRITE_REG(&adapter->hw, REG_MAC_CTRL, mac_ctrl_data);
445 	atl1c_irq_enable(adapter);
446 }
447 
448 static void atl1c_restore_vlan(struct atl1c_adapter *adapter)
449 {
450 	struct pci_dev *pdev = adapter->pdev;
451 
452 	if (netif_msg_pktdata(adapter))
453 		dev_dbg(&pdev->dev, "atl1c_restore_vlan\n");
454 	atl1c_vlan_mode(adapter->netdev, adapter->netdev->features);
455 }
456 
457 /**
458  * atl1c_set_mac - Change the Ethernet Address of the NIC
459  * @netdev: network interface device structure
460  * @p: pointer to an address structure
461  *
462  * Returns 0 on success, negative on failure
463  */
464 static int atl1c_set_mac_addr(struct net_device *netdev, void *p)
465 {
466 	struct atl1c_adapter *adapter = netdev_priv(netdev);
467 	struct sockaddr *addr = p;
468 
469 	if (!is_valid_ether_addr(addr->sa_data))
470 		return -EADDRNOTAVAIL;
471 
472 	if (netif_running(netdev))
473 		return -EBUSY;
474 
475 	memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
476 	memcpy(adapter->hw.mac_addr, addr->sa_data, netdev->addr_len);
477 
478 	atl1c_hw_set_mac_addr(&adapter->hw, adapter->hw.mac_addr);
479 
480 	return 0;
481 }
482 
483 static void atl1c_set_rxbufsize(struct atl1c_adapter *adapter,
484 				struct net_device *dev)
485 {
486 	unsigned int head_size;
487 	int mtu = dev->mtu;
488 
489 	adapter->rx_buffer_len = mtu > AT_RX_BUF_SIZE ?
490 		roundup(mtu + ETH_HLEN + ETH_FCS_LEN + VLAN_HLEN, 8) : AT_RX_BUF_SIZE;
491 
492 	head_size = SKB_DATA_ALIGN(adapter->rx_buffer_len + NET_SKB_PAD) +
493 		    SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
494 	adapter->rx_frag_size = roundup_pow_of_two(head_size);
495 }
496 
497 static netdev_features_t atl1c_fix_features(struct net_device *netdev,
498 	netdev_features_t features)
499 {
500 	/*
501 	 * Since there is no support for separate rx/tx vlan accel
502 	 * enable/disable make sure tx flag is always in same state as rx.
503 	 */
504 	if (features & NETIF_F_HW_VLAN_CTAG_RX)
505 		features |= NETIF_F_HW_VLAN_CTAG_TX;
506 	else
507 		features &= ~NETIF_F_HW_VLAN_CTAG_TX;
508 
509 	if (netdev->mtu > MAX_TSO_FRAME_SIZE)
510 		features &= ~(NETIF_F_TSO | NETIF_F_TSO6);
511 
512 	return features;
513 }
514 
515 static int atl1c_set_features(struct net_device *netdev,
516 	netdev_features_t features)
517 {
518 	netdev_features_t changed = netdev->features ^ features;
519 
520 	if (changed & NETIF_F_HW_VLAN_CTAG_RX)
521 		atl1c_vlan_mode(netdev, features);
522 
523 	return 0;
524 }
525 
526 /**
527  * atl1c_change_mtu - Change the Maximum Transfer Unit
528  * @netdev: network interface device structure
529  * @new_mtu: new value for maximum frame size
530  *
531  * Returns 0 on success, negative on failure
532  */
533 static int atl1c_change_mtu(struct net_device *netdev, int new_mtu)
534 {
535 	struct atl1c_adapter *adapter = netdev_priv(netdev);
536 	struct atl1c_hw *hw = &adapter->hw;
537 	int old_mtu   = netdev->mtu;
538 	int max_frame = new_mtu + ETH_HLEN + ETH_FCS_LEN + VLAN_HLEN;
539 
540 	/* Fast Ethernet controller doesn't support jumbo packet */
541 	if (((hw->nic_type == athr_l2c ||
542 	      hw->nic_type == athr_l2c_b ||
543 	      hw->nic_type == athr_l2c_b2) && new_mtu > ETH_DATA_LEN) ||
544 	      max_frame < ETH_ZLEN + ETH_FCS_LEN ||
545 	      max_frame > MAX_JUMBO_FRAME_SIZE) {
546 		if (netif_msg_link(adapter))
547 			dev_warn(&adapter->pdev->dev, "invalid MTU setting\n");
548 		return -EINVAL;
549 	}
550 	/* set MTU */
551 	if (old_mtu != new_mtu && netif_running(netdev)) {
552 		while (test_and_set_bit(__AT_RESETTING, &adapter->flags))
553 			msleep(1);
554 		netdev->mtu = new_mtu;
555 		adapter->hw.max_frame_size = new_mtu;
556 		atl1c_set_rxbufsize(adapter, netdev);
557 		atl1c_down(adapter);
558 		netdev_update_features(netdev);
559 		atl1c_up(adapter);
560 		clear_bit(__AT_RESETTING, &adapter->flags);
561 	}
562 	return 0;
563 }
564 
565 /*
566  *  caller should hold mdio_lock
567  */
568 static int atl1c_mdio_read(struct net_device *netdev, int phy_id, int reg_num)
569 {
570 	struct atl1c_adapter *adapter = netdev_priv(netdev);
571 	u16 result;
572 
573 	atl1c_read_phy_reg(&adapter->hw, reg_num, &result);
574 	return result;
575 }
576 
577 static void atl1c_mdio_write(struct net_device *netdev, int phy_id,
578 			     int reg_num, int val)
579 {
580 	struct atl1c_adapter *adapter = netdev_priv(netdev);
581 
582 	atl1c_write_phy_reg(&adapter->hw, reg_num, val);
583 }
584 
585 static int atl1c_mii_ioctl(struct net_device *netdev,
586 			   struct ifreq *ifr, int cmd)
587 {
588 	struct atl1c_adapter *adapter = netdev_priv(netdev);
589 	struct pci_dev *pdev = adapter->pdev;
590 	struct mii_ioctl_data *data = if_mii(ifr);
591 	unsigned long flags;
592 	int retval = 0;
593 
594 	if (!netif_running(netdev))
595 		return -EINVAL;
596 
597 	spin_lock_irqsave(&adapter->mdio_lock, flags);
598 	switch (cmd) {
599 	case SIOCGMIIPHY:
600 		data->phy_id = 0;
601 		break;
602 
603 	case SIOCGMIIREG:
604 		if (atl1c_read_phy_reg(&adapter->hw, data->reg_num & 0x1F,
605 				    &data->val_out)) {
606 			retval = -EIO;
607 			goto out;
608 		}
609 		break;
610 
611 	case SIOCSMIIREG:
612 		if (data->reg_num & ~(0x1F)) {
613 			retval = -EFAULT;
614 			goto out;
615 		}
616 
617 		dev_dbg(&pdev->dev, "<atl1c_mii_ioctl> write %x %x",
618 				data->reg_num, data->val_in);
619 		if (atl1c_write_phy_reg(&adapter->hw,
620 				     data->reg_num, data->val_in)) {
621 			retval = -EIO;
622 			goto out;
623 		}
624 		break;
625 
626 	default:
627 		retval = -EOPNOTSUPP;
628 		break;
629 	}
630 out:
631 	spin_unlock_irqrestore(&adapter->mdio_lock, flags);
632 	return retval;
633 }
634 
635 static int atl1c_ioctl(struct net_device *netdev, struct ifreq *ifr, int cmd)
636 {
637 	switch (cmd) {
638 	case SIOCGMIIPHY:
639 	case SIOCGMIIREG:
640 	case SIOCSMIIREG:
641 		return atl1c_mii_ioctl(netdev, ifr, cmd);
642 	default:
643 		return -EOPNOTSUPP;
644 	}
645 }
646 
647 /**
648  * atl1c_alloc_queues - Allocate memory for all rings
649  * @adapter: board private structure to initialize
650  *
651  */
652 static int atl1c_alloc_queues(struct atl1c_adapter *adapter)
653 {
654 	return 0;
655 }
656 
657 static void atl1c_set_mac_type(struct atl1c_hw *hw)
658 {
659 	switch (hw->device_id) {
660 	case PCI_DEVICE_ID_ATTANSIC_L2C:
661 		hw->nic_type = athr_l2c;
662 		break;
663 	case PCI_DEVICE_ID_ATTANSIC_L1C:
664 		hw->nic_type = athr_l1c;
665 		break;
666 	case PCI_DEVICE_ID_ATHEROS_L2C_B:
667 		hw->nic_type = athr_l2c_b;
668 		break;
669 	case PCI_DEVICE_ID_ATHEROS_L2C_B2:
670 		hw->nic_type = athr_l2c_b2;
671 		break;
672 	case PCI_DEVICE_ID_ATHEROS_L1D:
673 		hw->nic_type = athr_l1d;
674 		break;
675 	case PCI_DEVICE_ID_ATHEROS_L1D_2_0:
676 		hw->nic_type = athr_l1d_2;
677 		break;
678 	default:
679 		break;
680 	}
681 }
682 
683 static int atl1c_setup_mac_funcs(struct atl1c_hw *hw)
684 {
685 	u32 link_ctrl_data;
686 
687 	atl1c_set_mac_type(hw);
688 	AT_READ_REG(hw, REG_LINK_CTRL, &link_ctrl_data);
689 
690 	hw->ctrl_flags = ATL1C_INTR_MODRT_ENABLE  |
691 			 ATL1C_TXQ_MODE_ENHANCE;
692 	hw->ctrl_flags |= ATL1C_ASPM_L0S_SUPPORT |
693 			  ATL1C_ASPM_L1_SUPPORT;
694 	hw->ctrl_flags |= ATL1C_ASPM_CTRL_MON;
695 
696 	if (hw->nic_type == athr_l1c ||
697 	    hw->nic_type == athr_l1d ||
698 	    hw->nic_type == athr_l1d_2)
699 		hw->link_cap_flags |= ATL1C_LINK_CAP_1000M;
700 	return 0;
701 }
702 
703 struct atl1c_platform_patch {
704 	u16 pci_did;
705 	u8  pci_revid;
706 	u16 subsystem_vid;
707 	u16 subsystem_did;
708 	u32 patch_flag;
709 #define ATL1C_LINK_PATCH	0x1
710 };
711 static const struct atl1c_platform_patch plats[] = {
712 {0x2060, 0xC1, 0x1019, 0x8152, 0x1},
713 {0x2060, 0xC1, 0x1019, 0x2060, 0x1},
714 {0x2060, 0xC1, 0x1019, 0xE000, 0x1},
715 {0x2062, 0xC0, 0x1019, 0x8152, 0x1},
716 {0x2062, 0xC0, 0x1019, 0x2062, 0x1},
717 {0x2062, 0xC0, 0x1458, 0xE000, 0x1},
718 {0x2062, 0xC1, 0x1019, 0x8152, 0x1},
719 {0x2062, 0xC1, 0x1019, 0x2062, 0x1},
720 {0x2062, 0xC1, 0x1458, 0xE000, 0x1},
721 {0x2062, 0xC1, 0x1565, 0x2802, 0x1},
722 {0x2062, 0xC1, 0x1565, 0x2801, 0x1},
723 {0x1073, 0xC0, 0x1019, 0x8151, 0x1},
724 {0x1073, 0xC0, 0x1019, 0x1073, 0x1},
725 {0x1073, 0xC0, 0x1458, 0xE000, 0x1},
726 {0x1083, 0xC0, 0x1458, 0xE000, 0x1},
727 {0x1083, 0xC0, 0x1019, 0x8151, 0x1},
728 {0x1083, 0xC0, 0x1019, 0x1083, 0x1},
729 {0x1083, 0xC0, 0x1462, 0x7680, 0x1},
730 {0x1083, 0xC0, 0x1565, 0x2803, 0x1},
731 {0},
732 };
733 
734 static void atl1c_patch_assign(struct atl1c_hw *hw)
735 {
736 	struct pci_dev	*pdev = hw->adapter->pdev;
737 	u32 misc_ctrl;
738 	int i = 0;
739 
740 	hw->msi_lnkpatch = false;
741 
742 	while (plats[i].pci_did != 0) {
743 		if (plats[i].pci_did == hw->device_id &&
744 		    plats[i].pci_revid == hw->revision_id &&
745 		    plats[i].subsystem_vid == hw->subsystem_vendor_id &&
746 		    plats[i].subsystem_did == hw->subsystem_id) {
747 			if (plats[i].patch_flag & ATL1C_LINK_PATCH)
748 				hw->msi_lnkpatch = true;
749 		}
750 		i++;
751 	}
752 
753 	if (hw->device_id == PCI_DEVICE_ID_ATHEROS_L2C_B2 &&
754 	    hw->revision_id == L2CB_V21) {
755 		/* config access mode */
756 		pci_write_config_dword(pdev, REG_PCIE_IND_ACC_ADDR,
757 				       REG_PCIE_DEV_MISC_CTRL);
758 		pci_read_config_dword(pdev, REG_PCIE_IND_ACC_DATA, &misc_ctrl);
759 		misc_ctrl &= ~0x100;
760 		pci_write_config_dword(pdev, REG_PCIE_IND_ACC_ADDR,
761 				       REG_PCIE_DEV_MISC_CTRL);
762 		pci_write_config_dword(pdev, REG_PCIE_IND_ACC_DATA, misc_ctrl);
763 	}
764 }
765 /**
766  * atl1c_sw_init - Initialize general software structures (struct atl1c_adapter)
767  * @adapter: board private structure to initialize
768  *
769  * atl1c_sw_init initializes the Adapter private data structure.
770  * Fields are initialized based on PCI device information and
771  * OS network device settings (MTU size).
772  */
773 static int atl1c_sw_init(struct atl1c_adapter *adapter)
774 {
775 	struct atl1c_hw *hw   = &adapter->hw;
776 	struct pci_dev	*pdev = adapter->pdev;
777 	u32 revision;
778 
779 
780 	adapter->wol = 0;
781 	device_set_wakeup_enable(&pdev->dev, false);
782 	adapter->link_speed = SPEED_0;
783 	adapter->link_duplex = FULL_DUPLEX;
784 	adapter->tpd_ring[0].count = 1024;
785 	adapter->rfd_ring.count = 512;
786 
787 	hw->vendor_id = pdev->vendor;
788 	hw->device_id = pdev->device;
789 	hw->subsystem_vendor_id = pdev->subsystem_vendor;
790 	hw->subsystem_id = pdev->subsystem_device;
791 	pci_read_config_dword(pdev, PCI_CLASS_REVISION, &revision);
792 	hw->revision_id = revision & 0xFF;
793 	/* before link up, we assume hibernate is true */
794 	hw->hibernate = true;
795 	hw->media_type = MEDIA_TYPE_AUTO_SENSOR;
796 	if (atl1c_setup_mac_funcs(hw) != 0) {
797 		dev_err(&pdev->dev, "set mac function pointers failed\n");
798 		return -1;
799 	}
800 	atl1c_patch_assign(hw);
801 
802 	hw->intr_mask = IMR_NORMAL_MASK;
803 	hw->phy_configured = false;
804 	hw->preamble_len = 7;
805 	hw->max_frame_size = adapter->netdev->mtu;
806 	hw->autoneg_advertised = ADVERTISED_Autoneg;
807 	hw->indirect_tab = 0xE4E4E4E4;
808 	hw->base_cpu = 0;
809 
810 	hw->ict = 50000;		/* 100ms */
811 	hw->smb_timer = 200000;	  	/* 400ms */
812 	hw->rx_imt = 200;
813 	hw->tx_imt = 1000;
814 
815 	hw->tpd_burst = 5;
816 	hw->rfd_burst = 8;
817 	hw->dma_order = atl1c_dma_ord_out;
818 	hw->dmar_block = atl1c_dma_req_1024;
819 
820 	if (atl1c_alloc_queues(adapter)) {
821 		dev_err(&pdev->dev, "Unable to allocate memory for queues\n");
822 		return -ENOMEM;
823 	}
824 	/* TODO */
825 	atl1c_set_rxbufsize(adapter, adapter->netdev);
826 	atomic_set(&adapter->irq_sem, 1);
827 	spin_lock_init(&adapter->mdio_lock);
828 	spin_lock_init(&adapter->tx_lock);
829 	set_bit(__AT_DOWN, &adapter->flags);
830 
831 	return 0;
832 }
833 
834 static inline void atl1c_clean_buffer(struct pci_dev *pdev,
835 				struct atl1c_buffer *buffer_info)
836 {
837 	u16 pci_driection;
838 	if (buffer_info->flags & ATL1C_BUFFER_FREE)
839 		return;
840 	if (buffer_info->dma) {
841 		if (buffer_info->flags & ATL1C_PCIMAP_FROMDEVICE)
842 			pci_driection = PCI_DMA_FROMDEVICE;
843 		else
844 			pci_driection = PCI_DMA_TODEVICE;
845 
846 		if (buffer_info->flags & ATL1C_PCIMAP_SINGLE)
847 			pci_unmap_single(pdev, buffer_info->dma,
848 					buffer_info->length, pci_driection);
849 		else if (buffer_info->flags & ATL1C_PCIMAP_PAGE)
850 			pci_unmap_page(pdev, buffer_info->dma,
851 					buffer_info->length, pci_driection);
852 	}
853 	if (buffer_info->skb)
854 		dev_consume_skb_any(buffer_info->skb);
855 	buffer_info->dma = 0;
856 	buffer_info->skb = NULL;
857 	ATL1C_SET_BUFFER_STATE(buffer_info, ATL1C_BUFFER_FREE);
858 }
859 /**
860  * atl1c_clean_tx_ring - Free Tx-skb
861  * @adapter: board private structure
862  */
863 static void atl1c_clean_tx_ring(struct atl1c_adapter *adapter,
864 				enum atl1c_trans_queue type)
865 {
866 	struct atl1c_tpd_ring *tpd_ring = &adapter->tpd_ring[type];
867 	struct atl1c_buffer *buffer_info;
868 	struct pci_dev *pdev = adapter->pdev;
869 	u16 index, ring_count;
870 
871 	ring_count = tpd_ring->count;
872 	for (index = 0; index < ring_count; index++) {
873 		buffer_info = &tpd_ring->buffer_info[index];
874 		atl1c_clean_buffer(pdev, buffer_info);
875 	}
876 
877 	/* Zero out Tx-buffers */
878 	memset(tpd_ring->desc, 0, sizeof(struct atl1c_tpd_desc) *
879 		ring_count);
880 	atomic_set(&tpd_ring->next_to_clean, 0);
881 	tpd_ring->next_to_use = 0;
882 }
883 
884 /**
885  * atl1c_clean_rx_ring - Free rx-reservation skbs
886  * @adapter: board private structure
887  */
888 static void atl1c_clean_rx_ring(struct atl1c_adapter *adapter)
889 {
890 	struct atl1c_rfd_ring *rfd_ring = &adapter->rfd_ring;
891 	struct atl1c_rrd_ring *rrd_ring = &adapter->rrd_ring;
892 	struct atl1c_buffer *buffer_info;
893 	struct pci_dev *pdev = adapter->pdev;
894 	int j;
895 
896 	for (j = 0; j < rfd_ring->count; j++) {
897 		buffer_info = &rfd_ring->buffer_info[j];
898 		atl1c_clean_buffer(pdev, buffer_info);
899 	}
900 	/* zero out the descriptor ring */
901 	memset(rfd_ring->desc, 0, rfd_ring->size);
902 	rfd_ring->next_to_clean = 0;
903 	rfd_ring->next_to_use = 0;
904 	rrd_ring->next_to_use = 0;
905 	rrd_ring->next_to_clean = 0;
906 }
907 
908 /*
909  * Read / Write Ptr Initialize:
910  */
911 static void atl1c_init_ring_ptrs(struct atl1c_adapter *adapter)
912 {
913 	struct atl1c_tpd_ring *tpd_ring = adapter->tpd_ring;
914 	struct atl1c_rfd_ring *rfd_ring = &adapter->rfd_ring;
915 	struct atl1c_rrd_ring *rrd_ring = &adapter->rrd_ring;
916 	struct atl1c_buffer *buffer_info;
917 	int i, j;
918 
919 	for (i = 0; i < AT_MAX_TRANSMIT_QUEUE; i++) {
920 		tpd_ring[i].next_to_use = 0;
921 		atomic_set(&tpd_ring[i].next_to_clean, 0);
922 		buffer_info = tpd_ring[i].buffer_info;
923 		for (j = 0; j < tpd_ring->count; j++)
924 			ATL1C_SET_BUFFER_STATE(&buffer_info[i],
925 					ATL1C_BUFFER_FREE);
926 	}
927 	rfd_ring->next_to_use = 0;
928 	rfd_ring->next_to_clean = 0;
929 	rrd_ring->next_to_use = 0;
930 	rrd_ring->next_to_clean = 0;
931 	for (j = 0; j < rfd_ring->count; j++) {
932 		buffer_info = &rfd_ring->buffer_info[j];
933 		ATL1C_SET_BUFFER_STATE(buffer_info, ATL1C_BUFFER_FREE);
934 	}
935 }
936 
937 /**
938  * atl1c_free_ring_resources - Free Tx / RX descriptor Resources
939  * @adapter: board private structure
940  *
941  * Free all transmit software resources
942  */
943 static void atl1c_free_ring_resources(struct atl1c_adapter *adapter)
944 {
945 	struct pci_dev *pdev = adapter->pdev;
946 
947 	pci_free_consistent(pdev, adapter->ring_header.size,
948 					adapter->ring_header.desc,
949 					adapter->ring_header.dma);
950 	adapter->ring_header.desc = NULL;
951 
952 	/* Note: just free tdp_ring.buffer_info,
953 	*  it contain rfd_ring.buffer_info, do not double free */
954 	if (adapter->tpd_ring[0].buffer_info) {
955 		kfree(adapter->tpd_ring[0].buffer_info);
956 		adapter->tpd_ring[0].buffer_info = NULL;
957 	}
958 	if (adapter->rx_page) {
959 		put_page(adapter->rx_page);
960 		adapter->rx_page = NULL;
961 	}
962 }
963 
964 /**
965  * atl1c_setup_mem_resources - allocate Tx / RX descriptor resources
966  * @adapter: board private structure
967  *
968  * Return 0 on success, negative on failure
969  */
970 static int atl1c_setup_ring_resources(struct atl1c_adapter *adapter)
971 {
972 	struct pci_dev *pdev = adapter->pdev;
973 	struct atl1c_tpd_ring *tpd_ring = adapter->tpd_ring;
974 	struct atl1c_rfd_ring *rfd_ring = &adapter->rfd_ring;
975 	struct atl1c_rrd_ring *rrd_ring = &adapter->rrd_ring;
976 	struct atl1c_ring_header *ring_header = &adapter->ring_header;
977 	int size;
978 	int i;
979 	int count = 0;
980 	int rx_desc_count = 0;
981 	u32 offset = 0;
982 
983 	rrd_ring->count = rfd_ring->count;
984 	for (i = 1; i < AT_MAX_TRANSMIT_QUEUE; i++)
985 		tpd_ring[i].count = tpd_ring[0].count;
986 
987 	/* 2 tpd queue, one high priority queue,
988 	 * another normal priority queue */
989 	size = sizeof(struct atl1c_buffer) * (tpd_ring->count * 2 +
990 		rfd_ring->count);
991 	tpd_ring->buffer_info = kzalloc(size, GFP_KERNEL);
992 	if (unlikely(!tpd_ring->buffer_info))
993 		goto err_nomem;
994 
995 	for (i = 0; i < AT_MAX_TRANSMIT_QUEUE; i++) {
996 		tpd_ring[i].buffer_info =
997 			(tpd_ring->buffer_info + count);
998 		count += tpd_ring[i].count;
999 	}
1000 
1001 	rfd_ring->buffer_info =
1002 		(tpd_ring->buffer_info + count);
1003 	count += rfd_ring->count;
1004 	rx_desc_count += rfd_ring->count;
1005 
1006 	/*
1007 	 * real ring DMA buffer
1008 	 * each ring/block may need up to 8 bytes for alignment, hence the
1009 	 * additional bytes tacked onto the end.
1010 	 */
1011 	ring_header->size = size =
1012 		sizeof(struct atl1c_tpd_desc) * tpd_ring->count * 2 +
1013 		sizeof(struct atl1c_rx_free_desc) * rx_desc_count +
1014 		sizeof(struct atl1c_recv_ret_status) * rx_desc_count +
1015 		8 * 4;
1016 
1017 	ring_header->desc = pci_alloc_consistent(pdev, ring_header->size,
1018 				&ring_header->dma);
1019 	if (unlikely(!ring_header->desc)) {
1020 		dev_err(&pdev->dev, "pci_alloc_consistend failed\n");
1021 		goto err_nomem;
1022 	}
1023 	memset(ring_header->desc, 0, ring_header->size);
1024 	/* init TPD ring */
1025 
1026 	tpd_ring[0].dma = roundup(ring_header->dma, 8);
1027 	offset = tpd_ring[0].dma - ring_header->dma;
1028 	for (i = 0; i < AT_MAX_TRANSMIT_QUEUE; i++) {
1029 		tpd_ring[i].dma = ring_header->dma + offset;
1030 		tpd_ring[i].desc = (u8 *) ring_header->desc + offset;
1031 		tpd_ring[i].size =
1032 			sizeof(struct atl1c_tpd_desc) * tpd_ring[i].count;
1033 		offset += roundup(tpd_ring[i].size, 8);
1034 	}
1035 	/* init RFD ring */
1036 	rfd_ring->dma = ring_header->dma + offset;
1037 	rfd_ring->desc = (u8 *) ring_header->desc + offset;
1038 	rfd_ring->size = sizeof(struct atl1c_rx_free_desc) * rfd_ring->count;
1039 	offset += roundup(rfd_ring->size, 8);
1040 
1041 	/* init RRD ring */
1042 	rrd_ring->dma = ring_header->dma + offset;
1043 	rrd_ring->desc = (u8 *) ring_header->desc + offset;
1044 	rrd_ring->size = sizeof(struct atl1c_recv_ret_status) *
1045 		rrd_ring->count;
1046 	offset += roundup(rrd_ring->size, 8);
1047 
1048 	return 0;
1049 
1050 err_nomem:
1051 	kfree(tpd_ring->buffer_info);
1052 	return -ENOMEM;
1053 }
1054 
1055 static void atl1c_configure_des_ring(struct atl1c_adapter *adapter)
1056 {
1057 	struct atl1c_hw *hw = &adapter->hw;
1058 	struct atl1c_rfd_ring *rfd_ring = &adapter->rfd_ring;
1059 	struct atl1c_rrd_ring *rrd_ring = &adapter->rrd_ring;
1060 	struct atl1c_tpd_ring *tpd_ring = (struct atl1c_tpd_ring *)
1061 				adapter->tpd_ring;
1062 
1063 	/* TPD */
1064 	AT_WRITE_REG(hw, REG_TX_BASE_ADDR_HI,
1065 			(u32)((tpd_ring[atl1c_trans_normal].dma &
1066 				AT_DMA_HI_ADDR_MASK) >> 32));
1067 	/* just enable normal priority TX queue */
1068 	AT_WRITE_REG(hw, REG_TPD_PRI0_ADDR_LO,
1069 			(u32)(tpd_ring[atl1c_trans_normal].dma &
1070 				AT_DMA_LO_ADDR_MASK));
1071 	AT_WRITE_REG(hw, REG_TPD_PRI1_ADDR_LO,
1072 			(u32)(tpd_ring[atl1c_trans_high].dma &
1073 				AT_DMA_LO_ADDR_MASK));
1074 	AT_WRITE_REG(hw, REG_TPD_RING_SIZE,
1075 			(u32)(tpd_ring[0].count & TPD_RING_SIZE_MASK));
1076 
1077 
1078 	/* RFD */
1079 	AT_WRITE_REG(hw, REG_RX_BASE_ADDR_HI,
1080 			(u32)((rfd_ring->dma & AT_DMA_HI_ADDR_MASK) >> 32));
1081 	AT_WRITE_REG(hw, REG_RFD0_HEAD_ADDR_LO,
1082 			(u32)(rfd_ring->dma & AT_DMA_LO_ADDR_MASK));
1083 
1084 	AT_WRITE_REG(hw, REG_RFD_RING_SIZE,
1085 			rfd_ring->count & RFD_RING_SIZE_MASK);
1086 	AT_WRITE_REG(hw, REG_RX_BUF_SIZE,
1087 			adapter->rx_buffer_len & RX_BUF_SIZE_MASK);
1088 
1089 	/* RRD */
1090 	AT_WRITE_REG(hw, REG_RRD0_HEAD_ADDR_LO,
1091 			(u32)(rrd_ring->dma & AT_DMA_LO_ADDR_MASK));
1092 	AT_WRITE_REG(hw, REG_RRD_RING_SIZE,
1093 			(rrd_ring->count & RRD_RING_SIZE_MASK));
1094 
1095 	if (hw->nic_type == athr_l2c_b) {
1096 		AT_WRITE_REG(hw, REG_SRAM_RXF_LEN, 0x02a0L);
1097 		AT_WRITE_REG(hw, REG_SRAM_TXF_LEN, 0x0100L);
1098 		AT_WRITE_REG(hw, REG_SRAM_RXF_ADDR, 0x029f0000L);
1099 		AT_WRITE_REG(hw, REG_SRAM_RFD0_INFO, 0x02bf02a0L);
1100 		AT_WRITE_REG(hw, REG_SRAM_TXF_ADDR, 0x03bf02c0L);
1101 		AT_WRITE_REG(hw, REG_SRAM_TRD_ADDR, 0x03df03c0L);
1102 		AT_WRITE_REG(hw, REG_TXF_WATER_MARK, 0);	/* TX watermark, to enter l1 state.*/
1103 		AT_WRITE_REG(hw, REG_RXD_DMA_CTRL, 0);		/* RXD threshold.*/
1104 	}
1105 	/* Load all of base address above */
1106 	AT_WRITE_REG(hw, REG_LOAD_PTR, 1);
1107 }
1108 
1109 static void atl1c_configure_tx(struct atl1c_adapter *adapter)
1110 {
1111 	struct atl1c_hw *hw = &adapter->hw;
1112 	int max_pay_load;
1113 	u16 tx_offload_thresh;
1114 	u32 txq_ctrl_data;
1115 
1116 	tx_offload_thresh = MAX_TSO_FRAME_SIZE;
1117 	AT_WRITE_REG(hw, REG_TX_TSO_OFFLOAD_THRESH,
1118 		(tx_offload_thresh >> 3) & TX_TSO_OFFLOAD_THRESH_MASK);
1119 	max_pay_load = pcie_get_readrq(adapter->pdev) >> 8;
1120 	hw->dmar_block = min_t(u32, max_pay_load, hw->dmar_block);
1121 	/*
1122 	 * if BIOS had changed the dam-read-max-length to an invalid value,
1123 	 * restore it to default value
1124 	 */
1125 	if (hw->dmar_block < DEVICE_CTRL_MAXRRS_MIN) {
1126 		pcie_set_readrq(adapter->pdev, 128 << DEVICE_CTRL_MAXRRS_MIN);
1127 		hw->dmar_block = DEVICE_CTRL_MAXRRS_MIN;
1128 	}
1129 	txq_ctrl_data =
1130 		hw->nic_type == athr_l2c_b || hw->nic_type == athr_l2c_b2 ?
1131 		L2CB_TXQ_CFGV : L1C_TXQ_CFGV;
1132 
1133 	AT_WRITE_REG(hw, REG_TXQ_CTRL, txq_ctrl_data);
1134 }
1135 
1136 static void atl1c_configure_rx(struct atl1c_adapter *adapter)
1137 {
1138 	struct atl1c_hw *hw = &adapter->hw;
1139 	u32 rxq_ctrl_data;
1140 
1141 	rxq_ctrl_data = (hw->rfd_burst & RXQ_RFD_BURST_NUM_MASK) <<
1142 			RXQ_RFD_BURST_NUM_SHIFT;
1143 
1144 	if (hw->ctrl_flags & ATL1C_RX_IPV6_CHKSUM)
1145 		rxq_ctrl_data |= IPV6_CHKSUM_CTRL_EN;
1146 
1147 	/* aspm for gigabit */
1148 	if (hw->nic_type != athr_l1d_2 && (hw->device_id & 1) != 0)
1149 		rxq_ctrl_data = FIELD_SETX(rxq_ctrl_data, ASPM_THRUPUT_LIMIT,
1150 			ASPM_THRUPUT_LIMIT_100M);
1151 
1152 	AT_WRITE_REG(hw, REG_RXQ_CTRL, rxq_ctrl_data);
1153 }
1154 
1155 static void atl1c_configure_dma(struct atl1c_adapter *adapter)
1156 {
1157 	struct atl1c_hw *hw = &adapter->hw;
1158 	u32 dma_ctrl_data;
1159 
1160 	dma_ctrl_data = FIELDX(DMA_CTRL_RORDER_MODE, DMA_CTRL_RORDER_MODE_OUT) |
1161 		DMA_CTRL_RREQ_PRI_DATA |
1162 		FIELDX(DMA_CTRL_RREQ_BLEN, hw->dmar_block) |
1163 		FIELDX(DMA_CTRL_WDLY_CNT, DMA_CTRL_WDLY_CNT_DEF) |
1164 		FIELDX(DMA_CTRL_RDLY_CNT, DMA_CTRL_RDLY_CNT_DEF);
1165 
1166 	AT_WRITE_REG(hw, REG_DMA_CTRL, dma_ctrl_data);
1167 }
1168 
1169 /*
1170  * Stop the mac, transmit and receive units
1171  * hw - Struct containing variables accessed by shared code
1172  * return : 0  or  idle status (if error)
1173  */
1174 static int atl1c_stop_mac(struct atl1c_hw *hw)
1175 {
1176 	u32 data;
1177 
1178 	AT_READ_REG(hw, REG_RXQ_CTRL, &data);
1179 	data &= ~RXQ_CTRL_EN;
1180 	AT_WRITE_REG(hw, REG_RXQ_CTRL, data);
1181 
1182 	AT_READ_REG(hw, REG_TXQ_CTRL, &data);
1183 	data &= ~TXQ_CTRL_EN;
1184 	AT_WRITE_REG(hw, REG_TXQ_CTRL, data);
1185 
1186 	atl1c_wait_until_idle(hw, IDLE_STATUS_RXQ_BUSY | IDLE_STATUS_TXQ_BUSY);
1187 
1188 	AT_READ_REG(hw, REG_MAC_CTRL, &data);
1189 	data &= ~(MAC_CTRL_TX_EN | MAC_CTRL_RX_EN);
1190 	AT_WRITE_REG(hw, REG_MAC_CTRL, data);
1191 
1192 	return (int)atl1c_wait_until_idle(hw,
1193 		IDLE_STATUS_TXMAC_BUSY | IDLE_STATUS_RXMAC_BUSY);
1194 }
1195 
1196 static void atl1c_start_mac(struct atl1c_adapter *adapter)
1197 {
1198 	struct atl1c_hw *hw = &adapter->hw;
1199 	u32 mac, txq, rxq;
1200 
1201 	hw->mac_duplex = adapter->link_duplex == FULL_DUPLEX ? true : false;
1202 	hw->mac_speed = adapter->link_speed == SPEED_1000 ?
1203 		atl1c_mac_speed_1000 : atl1c_mac_speed_10_100;
1204 
1205 	AT_READ_REG(hw, REG_TXQ_CTRL, &txq);
1206 	AT_READ_REG(hw, REG_RXQ_CTRL, &rxq);
1207 	AT_READ_REG(hw, REG_MAC_CTRL, &mac);
1208 
1209 	txq |= TXQ_CTRL_EN;
1210 	rxq |= RXQ_CTRL_EN;
1211 	mac |= MAC_CTRL_TX_EN | MAC_CTRL_TX_FLOW |
1212 	       MAC_CTRL_RX_EN | MAC_CTRL_RX_FLOW |
1213 	       MAC_CTRL_ADD_CRC | MAC_CTRL_PAD |
1214 	       MAC_CTRL_BC_EN | MAC_CTRL_SINGLE_PAUSE_EN |
1215 	       MAC_CTRL_HASH_ALG_CRC32;
1216 	if (hw->mac_duplex)
1217 		mac |= MAC_CTRL_DUPLX;
1218 	else
1219 		mac &= ~MAC_CTRL_DUPLX;
1220 	mac = FIELD_SETX(mac, MAC_CTRL_SPEED, hw->mac_speed);
1221 	mac = FIELD_SETX(mac, MAC_CTRL_PRMLEN, hw->preamble_len);
1222 
1223 	AT_WRITE_REG(hw, REG_TXQ_CTRL, txq);
1224 	AT_WRITE_REG(hw, REG_RXQ_CTRL, rxq);
1225 	AT_WRITE_REG(hw, REG_MAC_CTRL, mac);
1226 }
1227 
1228 /*
1229  * Reset the transmit and receive units; mask and clear all interrupts.
1230  * hw - Struct containing variables accessed by shared code
1231  * return : 0  or  idle status (if error)
1232  */
1233 static int atl1c_reset_mac(struct atl1c_hw *hw)
1234 {
1235 	struct atl1c_adapter *adapter = hw->adapter;
1236 	struct pci_dev *pdev = adapter->pdev;
1237 	u32 ctrl_data = 0;
1238 
1239 	atl1c_stop_mac(hw);
1240 	/*
1241 	 * Issue Soft Reset to the MAC.  This will reset the chip's
1242 	 * transmit, receive, DMA.  It will not effect
1243 	 * the current PCI configuration.  The global reset bit is self-
1244 	 * clearing, and should clear within a microsecond.
1245 	 */
1246 	AT_READ_REG(hw, REG_MASTER_CTRL, &ctrl_data);
1247 	ctrl_data |= MASTER_CTRL_OOB_DIS;
1248 	AT_WRITE_REG(hw, REG_MASTER_CTRL, ctrl_data | MASTER_CTRL_SOFT_RST);
1249 
1250 	AT_WRITE_FLUSH(hw);
1251 	msleep(10);
1252 	/* Wait at least 10ms for All module to be Idle */
1253 
1254 	if (atl1c_wait_until_idle(hw, IDLE_STATUS_MASK)) {
1255 		dev_err(&pdev->dev,
1256 			"MAC state machine can't be idle since"
1257 			" disabled for 10ms second\n");
1258 		return -1;
1259 	}
1260 	AT_WRITE_REG(hw, REG_MASTER_CTRL, ctrl_data);
1261 
1262 	/* driver control speed/duplex */
1263 	AT_READ_REG(hw, REG_MAC_CTRL, &ctrl_data);
1264 	AT_WRITE_REG(hw, REG_MAC_CTRL, ctrl_data | MAC_CTRL_SPEED_MODE_SW);
1265 
1266 	/* clk switch setting */
1267 	AT_READ_REG(hw, REG_SERDES, &ctrl_data);
1268 	switch (hw->nic_type) {
1269 	case athr_l2c_b:
1270 		ctrl_data &= ~(SERDES_PHY_CLK_SLOWDOWN |
1271 				SERDES_MAC_CLK_SLOWDOWN);
1272 		AT_WRITE_REG(hw, REG_SERDES, ctrl_data);
1273 		break;
1274 	case athr_l2c_b2:
1275 	case athr_l1d_2:
1276 		ctrl_data |= SERDES_PHY_CLK_SLOWDOWN | SERDES_MAC_CLK_SLOWDOWN;
1277 		AT_WRITE_REG(hw, REG_SERDES, ctrl_data);
1278 		break;
1279 	default:
1280 		break;
1281 	}
1282 
1283 	return 0;
1284 }
1285 
1286 static void atl1c_disable_l0s_l1(struct atl1c_hw *hw)
1287 {
1288 	u16 ctrl_flags = hw->ctrl_flags;
1289 
1290 	hw->ctrl_flags &= ~(ATL1C_ASPM_L0S_SUPPORT | ATL1C_ASPM_L1_SUPPORT);
1291 	atl1c_set_aspm(hw, SPEED_0);
1292 	hw->ctrl_flags = ctrl_flags;
1293 }
1294 
1295 /*
1296  * Set ASPM state.
1297  * Enable/disable L0s/L1 depend on link state.
1298  */
1299 static void atl1c_set_aspm(struct atl1c_hw *hw, u16 link_speed)
1300 {
1301 	u32 pm_ctrl_data;
1302 	u32 link_l1_timer;
1303 
1304 	AT_READ_REG(hw, REG_PM_CTRL, &pm_ctrl_data);
1305 	pm_ctrl_data &= ~(PM_CTRL_ASPM_L1_EN |
1306 			  PM_CTRL_ASPM_L0S_EN |
1307 			  PM_CTRL_MAC_ASPM_CHK);
1308 	/* L1 timer */
1309 	if (hw->nic_type == athr_l2c_b2 || hw->nic_type == athr_l1d_2) {
1310 		pm_ctrl_data &= ~PMCTRL_TXL1_AFTER_L0S;
1311 		link_l1_timer =
1312 			link_speed == SPEED_1000 || link_speed == SPEED_100 ?
1313 			L1D_PMCTRL_L1_ENTRY_TM_16US : 1;
1314 		pm_ctrl_data = FIELD_SETX(pm_ctrl_data,
1315 			L1D_PMCTRL_L1_ENTRY_TM, link_l1_timer);
1316 	} else {
1317 		link_l1_timer = hw->nic_type == athr_l2c_b ?
1318 			L2CB1_PM_CTRL_L1_ENTRY_TM : L1C_PM_CTRL_L1_ENTRY_TM;
1319 		if (link_speed != SPEED_1000 && link_speed != SPEED_100)
1320 			link_l1_timer = 1;
1321 		pm_ctrl_data = FIELD_SETX(pm_ctrl_data,
1322 			PM_CTRL_L1_ENTRY_TIMER, link_l1_timer);
1323 	}
1324 
1325 	/* L0S/L1 enable */
1326 	if ((hw->ctrl_flags & ATL1C_ASPM_L0S_SUPPORT) && link_speed != SPEED_0)
1327 		pm_ctrl_data |= PM_CTRL_ASPM_L0S_EN | PM_CTRL_MAC_ASPM_CHK;
1328 	if (hw->ctrl_flags & ATL1C_ASPM_L1_SUPPORT)
1329 		pm_ctrl_data |= PM_CTRL_ASPM_L1_EN | PM_CTRL_MAC_ASPM_CHK;
1330 
1331 	/* l2cb & l1d & l2cb2 & l1d2 */
1332 	if (hw->nic_type == athr_l2c_b || hw->nic_type == athr_l1d ||
1333 	    hw->nic_type == athr_l2c_b2 || hw->nic_type == athr_l1d_2) {
1334 		pm_ctrl_data = FIELD_SETX(pm_ctrl_data,
1335 			PM_CTRL_PM_REQ_TIMER, PM_CTRL_PM_REQ_TO_DEF);
1336 		pm_ctrl_data |= PM_CTRL_RCVR_WT_TIMER |
1337 				PM_CTRL_SERDES_PD_EX_L1 |
1338 				PM_CTRL_CLK_SWH_L1;
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_SA_DLY_EN |
1343 				  PM_CTRL_HOTRST);
1344 		/* disable l0s if link down or l2cb */
1345 		if (link_speed == SPEED_0 || hw->nic_type == athr_l2c_b)
1346 			pm_ctrl_data &= ~PM_CTRL_ASPM_L0S_EN;
1347 	} else { /* l1c */
1348 		pm_ctrl_data =
1349 			FIELD_SETX(pm_ctrl_data, PM_CTRL_L1_ENTRY_TIMER, 0);
1350 		if (link_speed != SPEED_0) {
1351 			pm_ctrl_data |= PM_CTRL_SERDES_L1_EN |
1352 					PM_CTRL_SERDES_PLL_L1_EN |
1353 					PM_CTRL_SERDES_BUFS_RX_L1_EN;
1354 			pm_ctrl_data &= ~(PM_CTRL_SERDES_PD_EX_L1 |
1355 					  PM_CTRL_CLK_SWH_L1 |
1356 					  PM_CTRL_ASPM_L0S_EN |
1357 					  PM_CTRL_ASPM_L1_EN);
1358 		} else { /* link down */
1359 			pm_ctrl_data |= PM_CTRL_CLK_SWH_L1;
1360 			pm_ctrl_data &= ~(PM_CTRL_SERDES_L1_EN |
1361 					  PM_CTRL_SERDES_PLL_L1_EN |
1362 					  PM_CTRL_SERDES_BUFS_RX_L1_EN |
1363 					  PM_CTRL_ASPM_L0S_EN);
1364 		}
1365 	}
1366 	AT_WRITE_REG(hw, REG_PM_CTRL, pm_ctrl_data);
1367 
1368 	return;
1369 }
1370 
1371 /**
1372  * atl1c_configure - Configure Transmit&Receive Unit after Reset
1373  * @adapter: board private structure
1374  *
1375  * Configure the Tx /Rx unit of the MAC after a reset.
1376  */
1377 static int atl1c_configure_mac(struct atl1c_adapter *adapter)
1378 {
1379 	struct atl1c_hw *hw = &adapter->hw;
1380 	u32 master_ctrl_data = 0;
1381 	u32 intr_modrt_data;
1382 	u32 data;
1383 
1384 	AT_READ_REG(hw, REG_MASTER_CTRL, &master_ctrl_data);
1385 	master_ctrl_data &= ~(MASTER_CTRL_TX_ITIMER_EN |
1386 			      MASTER_CTRL_RX_ITIMER_EN |
1387 			      MASTER_CTRL_INT_RDCLR);
1388 	/* clear interrupt status */
1389 	AT_WRITE_REG(hw, REG_ISR, 0xFFFFFFFF);
1390 	/*  Clear any WOL status */
1391 	AT_WRITE_REG(hw, REG_WOL_CTRL, 0);
1392 	/* set Interrupt Clear Timer
1393 	 * HW will enable self to assert interrupt event to system after
1394 	 * waiting x-time for software to notify it accept interrupt.
1395 	 */
1396 
1397 	data = CLK_GATING_EN_ALL;
1398 	if (hw->ctrl_flags & ATL1C_CLK_GATING_EN) {
1399 		if (hw->nic_type == athr_l2c_b)
1400 			data &= ~CLK_GATING_RXMAC_EN;
1401 	} else
1402 		data = 0;
1403 	AT_WRITE_REG(hw, REG_CLK_GATING_CTRL, data);
1404 
1405 	AT_WRITE_REG(hw, REG_INT_RETRIG_TIMER,
1406 		hw->ict & INT_RETRIG_TIMER_MASK);
1407 
1408 	atl1c_configure_des_ring(adapter);
1409 
1410 	if (hw->ctrl_flags & ATL1C_INTR_MODRT_ENABLE) {
1411 		intr_modrt_data = (hw->tx_imt & IRQ_MODRT_TIMER_MASK) <<
1412 					IRQ_MODRT_TX_TIMER_SHIFT;
1413 		intr_modrt_data |= (hw->rx_imt & IRQ_MODRT_TIMER_MASK) <<
1414 					IRQ_MODRT_RX_TIMER_SHIFT;
1415 		AT_WRITE_REG(hw, REG_IRQ_MODRT_TIMER_INIT, intr_modrt_data);
1416 		master_ctrl_data |=
1417 			MASTER_CTRL_TX_ITIMER_EN | MASTER_CTRL_RX_ITIMER_EN;
1418 	}
1419 
1420 	if (hw->ctrl_flags & ATL1C_INTR_CLEAR_ON_READ)
1421 		master_ctrl_data |= MASTER_CTRL_INT_RDCLR;
1422 
1423 	master_ctrl_data |= MASTER_CTRL_SA_TIMER_EN;
1424 	AT_WRITE_REG(hw, REG_MASTER_CTRL, master_ctrl_data);
1425 
1426 	AT_WRITE_REG(hw, REG_SMB_STAT_TIMER,
1427 		hw->smb_timer & SMB_STAT_TIMER_MASK);
1428 
1429 	/* set MTU */
1430 	AT_WRITE_REG(hw, REG_MTU, hw->max_frame_size + ETH_HLEN +
1431 			VLAN_HLEN + ETH_FCS_LEN);
1432 
1433 	atl1c_configure_tx(adapter);
1434 	atl1c_configure_rx(adapter);
1435 	atl1c_configure_dma(adapter);
1436 
1437 	return 0;
1438 }
1439 
1440 static int atl1c_configure(struct atl1c_adapter *adapter)
1441 {
1442 	struct net_device *netdev = adapter->netdev;
1443 	int num;
1444 
1445 	atl1c_init_ring_ptrs(adapter);
1446 	atl1c_set_multi(netdev);
1447 	atl1c_restore_vlan(adapter);
1448 
1449 	num = atl1c_alloc_rx_buffer(adapter);
1450 	if (unlikely(num == 0))
1451 		return -ENOMEM;
1452 
1453 	if (atl1c_configure_mac(adapter))
1454 		return -EIO;
1455 
1456 	return 0;
1457 }
1458 
1459 static void atl1c_update_hw_stats(struct atl1c_adapter *adapter)
1460 {
1461 	u16 hw_reg_addr = 0;
1462 	unsigned long *stats_item = NULL;
1463 	u32 data;
1464 
1465 	/* update rx status */
1466 	hw_reg_addr = REG_MAC_RX_STATUS_BIN;
1467 	stats_item  = &adapter->hw_stats.rx_ok;
1468 	while (hw_reg_addr <= REG_MAC_RX_STATUS_END) {
1469 		AT_READ_REG(&adapter->hw, hw_reg_addr, &data);
1470 		*stats_item += data;
1471 		stats_item++;
1472 		hw_reg_addr += 4;
1473 	}
1474 /* update tx status */
1475 	hw_reg_addr = REG_MAC_TX_STATUS_BIN;
1476 	stats_item  = &adapter->hw_stats.tx_ok;
1477 	while (hw_reg_addr <= REG_MAC_TX_STATUS_END) {
1478 		AT_READ_REG(&adapter->hw, hw_reg_addr, &data);
1479 		*stats_item += data;
1480 		stats_item++;
1481 		hw_reg_addr += 4;
1482 	}
1483 }
1484 
1485 /**
1486  * atl1c_get_stats - Get System Network Statistics
1487  * @netdev: network interface device structure
1488  *
1489  * Returns the address of the device statistics structure.
1490  * The statistics are actually updated from the timer callback.
1491  */
1492 static struct net_device_stats *atl1c_get_stats(struct net_device *netdev)
1493 {
1494 	struct atl1c_adapter *adapter = netdev_priv(netdev);
1495 	struct atl1c_hw_stats  *hw_stats = &adapter->hw_stats;
1496 	struct net_device_stats *net_stats = &netdev->stats;
1497 
1498 	atl1c_update_hw_stats(adapter);
1499 	net_stats->rx_bytes   = hw_stats->rx_byte_cnt;
1500 	net_stats->tx_bytes   = hw_stats->tx_byte_cnt;
1501 	net_stats->multicast  = hw_stats->rx_mcast;
1502 	net_stats->collisions = hw_stats->tx_1_col +
1503 				hw_stats->tx_2_col +
1504 				hw_stats->tx_late_col +
1505 				hw_stats->tx_abort_col;
1506 
1507 	net_stats->rx_errors  = hw_stats->rx_frag +
1508 				hw_stats->rx_fcs_err +
1509 				hw_stats->rx_len_err +
1510 				hw_stats->rx_sz_ov +
1511 				hw_stats->rx_rrd_ov +
1512 				hw_stats->rx_align_err +
1513 				hw_stats->rx_rxf_ov;
1514 
1515 	net_stats->rx_fifo_errors   = hw_stats->rx_rxf_ov;
1516 	net_stats->rx_length_errors = hw_stats->rx_len_err;
1517 	net_stats->rx_crc_errors    = hw_stats->rx_fcs_err;
1518 	net_stats->rx_frame_errors  = hw_stats->rx_align_err;
1519 	net_stats->rx_dropped       = hw_stats->rx_rrd_ov;
1520 
1521 	net_stats->tx_errors = hw_stats->tx_late_col +
1522 			       hw_stats->tx_abort_col +
1523 			       hw_stats->tx_underrun +
1524 			       hw_stats->tx_trunc;
1525 
1526 	net_stats->tx_fifo_errors    = hw_stats->tx_underrun;
1527 	net_stats->tx_aborted_errors = hw_stats->tx_abort_col;
1528 	net_stats->tx_window_errors  = hw_stats->tx_late_col;
1529 
1530 	net_stats->rx_packets = hw_stats->rx_ok + net_stats->rx_errors;
1531 	net_stats->tx_packets = hw_stats->tx_ok + net_stats->tx_errors;
1532 
1533 	return net_stats;
1534 }
1535 
1536 static inline void atl1c_clear_phy_int(struct atl1c_adapter *adapter)
1537 {
1538 	u16 phy_data;
1539 
1540 	spin_lock(&adapter->mdio_lock);
1541 	atl1c_read_phy_reg(&adapter->hw, MII_ISR, &phy_data);
1542 	spin_unlock(&adapter->mdio_lock);
1543 }
1544 
1545 static bool atl1c_clean_tx_irq(struct atl1c_adapter *adapter,
1546 				enum atl1c_trans_queue type)
1547 {
1548 	struct atl1c_tpd_ring *tpd_ring = &adapter->tpd_ring[type];
1549 	struct atl1c_buffer *buffer_info;
1550 	struct pci_dev *pdev = adapter->pdev;
1551 	u16 next_to_clean = atomic_read(&tpd_ring->next_to_clean);
1552 	u16 hw_next_to_clean;
1553 	u16 reg;
1554 
1555 	reg = type == atl1c_trans_high ? REG_TPD_PRI1_CIDX : REG_TPD_PRI0_CIDX;
1556 
1557 	AT_READ_REGW(&adapter->hw, reg, &hw_next_to_clean);
1558 
1559 	while (next_to_clean != hw_next_to_clean) {
1560 		buffer_info = &tpd_ring->buffer_info[next_to_clean];
1561 		atl1c_clean_buffer(pdev, buffer_info);
1562 		if (++next_to_clean == tpd_ring->count)
1563 			next_to_clean = 0;
1564 		atomic_set(&tpd_ring->next_to_clean, next_to_clean);
1565 	}
1566 
1567 	if (netif_queue_stopped(adapter->netdev) &&
1568 			netif_carrier_ok(adapter->netdev)) {
1569 		netif_wake_queue(adapter->netdev);
1570 	}
1571 
1572 	return true;
1573 }
1574 
1575 /**
1576  * atl1c_intr - Interrupt Handler
1577  * @irq: interrupt number
1578  * @data: pointer to a network interface device structure
1579  */
1580 static irqreturn_t atl1c_intr(int irq, void *data)
1581 {
1582 	struct net_device *netdev  = data;
1583 	struct atl1c_adapter *adapter = netdev_priv(netdev);
1584 	struct pci_dev *pdev = adapter->pdev;
1585 	struct atl1c_hw *hw = &adapter->hw;
1586 	int max_ints = AT_MAX_INT_WORK;
1587 	int handled = IRQ_NONE;
1588 	u32 status;
1589 	u32 reg_data;
1590 
1591 	do {
1592 		AT_READ_REG(hw, REG_ISR, &reg_data);
1593 		status = reg_data & hw->intr_mask;
1594 
1595 		if (status == 0 || (status & ISR_DIS_INT) != 0) {
1596 			if (max_ints != AT_MAX_INT_WORK)
1597 				handled = IRQ_HANDLED;
1598 			break;
1599 		}
1600 		/* link event */
1601 		if (status & ISR_GPHY)
1602 			atl1c_clear_phy_int(adapter);
1603 		/* Ack ISR */
1604 		AT_WRITE_REG(hw, REG_ISR, status | ISR_DIS_INT);
1605 		if (status & ISR_RX_PKT) {
1606 			if (likely(napi_schedule_prep(&adapter->napi))) {
1607 				hw->intr_mask &= ~ISR_RX_PKT;
1608 				AT_WRITE_REG(hw, REG_IMR, hw->intr_mask);
1609 				__napi_schedule(&adapter->napi);
1610 			}
1611 		}
1612 		if (status & ISR_TX_PKT)
1613 			atl1c_clean_tx_irq(adapter, atl1c_trans_normal);
1614 
1615 		handled = IRQ_HANDLED;
1616 		/* check if PCIE PHY Link down */
1617 		if (status & ISR_ERROR) {
1618 			if (netif_msg_hw(adapter))
1619 				dev_err(&pdev->dev,
1620 					"atl1c hardware error (status = 0x%x)\n",
1621 					status & ISR_ERROR);
1622 			/* reset MAC */
1623 			set_bit(ATL1C_WORK_EVENT_RESET, &adapter->work_event);
1624 			schedule_work(&adapter->common_task);
1625 			return IRQ_HANDLED;
1626 		}
1627 
1628 		if (status & ISR_OVER)
1629 			if (netif_msg_intr(adapter))
1630 				dev_warn(&pdev->dev,
1631 					"TX/RX overflow (status = 0x%x)\n",
1632 					status & ISR_OVER);
1633 
1634 		/* link event */
1635 		if (status & (ISR_GPHY | ISR_MANUAL)) {
1636 			netdev->stats.tx_carrier_errors++;
1637 			atl1c_link_chg_event(adapter);
1638 			break;
1639 		}
1640 
1641 	} while (--max_ints > 0);
1642 	/* re-enable Interrupt*/
1643 	AT_WRITE_REG(&adapter->hw, REG_ISR, 0);
1644 	return handled;
1645 }
1646 
1647 static inline void atl1c_rx_checksum(struct atl1c_adapter *adapter,
1648 		  struct sk_buff *skb, struct atl1c_recv_ret_status *prrs)
1649 {
1650 	/*
1651 	 * The pid field in RRS in not correct sometimes, so we
1652 	 * cannot figure out if the packet is fragmented or not,
1653 	 * so we tell the KERNEL CHECKSUM_NONE
1654 	 */
1655 	skb_checksum_none_assert(skb);
1656 }
1657 
1658 static struct sk_buff *atl1c_alloc_skb(struct atl1c_adapter *adapter)
1659 {
1660 	struct sk_buff *skb;
1661 	struct page *page;
1662 
1663 	if (adapter->rx_frag_size > PAGE_SIZE)
1664 		return netdev_alloc_skb(adapter->netdev,
1665 					adapter->rx_buffer_len);
1666 
1667 	page = adapter->rx_page;
1668 	if (!page) {
1669 		adapter->rx_page = page = alloc_page(GFP_ATOMIC);
1670 		if (unlikely(!page))
1671 			return NULL;
1672 		adapter->rx_page_offset = 0;
1673 	}
1674 
1675 	skb = build_skb(page_address(page) + adapter->rx_page_offset,
1676 			adapter->rx_frag_size);
1677 	if (likely(skb)) {
1678 		adapter->rx_page_offset += adapter->rx_frag_size;
1679 		if (adapter->rx_page_offset >= PAGE_SIZE)
1680 			adapter->rx_page = NULL;
1681 		else
1682 			get_page(page);
1683 	}
1684 	return skb;
1685 }
1686 
1687 static int atl1c_alloc_rx_buffer(struct atl1c_adapter *adapter)
1688 {
1689 	struct atl1c_rfd_ring *rfd_ring = &adapter->rfd_ring;
1690 	struct pci_dev *pdev = adapter->pdev;
1691 	struct atl1c_buffer *buffer_info, *next_info;
1692 	struct sk_buff *skb;
1693 	void *vir_addr = NULL;
1694 	u16 num_alloc = 0;
1695 	u16 rfd_next_to_use, next_next;
1696 	struct atl1c_rx_free_desc *rfd_desc;
1697 	dma_addr_t mapping;
1698 
1699 	next_next = rfd_next_to_use = rfd_ring->next_to_use;
1700 	if (++next_next == rfd_ring->count)
1701 		next_next = 0;
1702 	buffer_info = &rfd_ring->buffer_info[rfd_next_to_use];
1703 	next_info = &rfd_ring->buffer_info[next_next];
1704 
1705 	while (next_info->flags & ATL1C_BUFFER_FREE) {
1706 		rfd_desc = ATL1C_RFD_DESC(rfd_ring, rfd_next_to_use);
1707 
1708 		skb = atl1c_alloc_skb(adapter);
1709 		if (unlikely(!skb)) {
1710 			if (netif_msg_rx_err(adapter))
1711 				dev_warn(&pdev->dev, "alloc rx buffer failed\n");
1712 			break;
1713 		}
1714 
1715 		/*
1716 		 * Make buffer alignment 2 beyond a 16 byte boundary
1717 		 * this will result in a 16 byte aligned IP header after
1718 		 * the 14 byte MAC header is removed
1719 		 */
1720 		vir_addr = skb->data;
1721 		ATL1C_SET_BUFFER_STATE(buffer_info, ATL1C_BUFFER_BUSY);
1722 		buffer_info->skb = skb;
1723 		buffer_info->length = adapter->rx_buffer_len;
1724 		mapping = pci_map_single(pdev, vir_addr,
1725 						buffer_info->length,
1726 						PCI_DMA_FROMDEVICE);
1727 		if (unlikely(pci_dma_mapping_error(pdev, mapping))) {
1728 			dev_kfree_skb(skb);
1729 			buffer_info->skb = NULL;
1730 			buffer_info->length = 0;
1731 			ATL1C_SET_BUFFER_STATE(buffer_info, ATL1C_BUFFER_FREE);
1732 			netif_warn(adapter, rx_err, adapter->netdev, "RX pci_map_single failed");
1733 			break;
1734 		}
1735 		buffer_info->dma = mapping;
1736 		ATL1C_SET_PCIMAP_TYPE(buffer_info, ATL1C_PCIMAP_SINGLE,
1737 			ATL1C_PCIMAP_FROMDEVICE);
1738 		rfd_desc->buffer_addr = cpu_to_le64(buffer_info->dma);
1739 		rfd_next_to_use = next_next;
1740 		if (++next_next == rfd_ring->count)
1741 			next_next = 0;
1742 		buffer_info = &rfd_ring->buffer_info[rfd_next_to_use];
1743 		next_info = &rfd_ring->buffer_info[next_next];
1744 		num_alloc++;
1745 	}
1746 
1747 	if (num_alloc) {
1748 		/* TODO: update mailbox here */
1749 		wmb();
1750 		rfd_ring->next_to_use = rfd_next_to_use;
1751 		AT_WRITE_REG(&adapter->hw, REG_MB_RFD0_PROD_IDX,
1752 			rfd_ring->next_to_use & MB_RFDX_PROD_IDX_MASK);
1753 	}
1754 
1755 	return num_alloc;
1756 }
1757 
1758 static void atl1c_clean_rrd(struct atl1c_rrd_ring *rrd_ring,
1759 			struct	atl1c_recv_ret_status *rrs, u16 num)
1760 {
1761 	u16 i;
1762 	/* the relationship between rrd and rfd is one map one */
1763 	for (i = 0; i < num; i++, rrs = ATL1C_RRD_DESC(rrd_ring,
1764 					rrd_ring->next_to_clean)) {
1765 		rrs->word3 &= ~RRS_RXD_UPDATED;
1766 		if (++rrd_ring->next_to_clean == rrd_ring->count)
1767 			rrd_ring->next_to_clean = 0;
1768 	}
1769 }
1770 
1771 static void atl1c_clean_rfd(struct atl1c_rfd_ring *rfd_ring,
1772 	struct atl1c_recv_ret_status *rrs, u16 num)
1773 {
1774 	u16 i;
1775 	u16 rfd_index;
1776 	struct atl1c_buffer *buffer_info = rfd_ring->buffer_info;
1777 
1778 	rfd_index = (rrs->word0 >> RRS_RX_RFD_INDEX_SHIFT) &
1779 			RRS_RX_RFD_INDEX_MASK;
1780 	for (i = 0; i < num; i++) {
1781 		buffer_info[rfd_index].skb = NULL;
1782 		ATL1C_SET_BUFFER_STATE(&buffer_info[rfd_index],
1783 					ATL1C_BUFFER_FREE);
1784 		if (++rfd_index == rfd_ring->count)
1785 			rfd_index = 0;
1786 	}
1787 	rfd_ring->next_to_clean = rfd_index;
1788 }
1789 
1790 static void atl1c_clean_rx_irq(struct atl1c_adapter *adapter,
1791 		   int *work_done, int work_to_do)
1792 {
1793 	u16 rfd_num, rfd_index;
1794 	u16 count = 0;
1795 	u16 length;
1796 	struct pci_dev *pdev = adapter->pdev;
1797 	struct net_device *netdev  = adapter->netdev;
1798 	struct atl1c_rfd_ring *rfd_ring = &adapter->rfd_ring;
1799 	struct atl1c_rrd_ring *rrd_ring = &adapter->rrd_ring;
1800 	struct sk_buff *skb;
1801 	struct atl1c_recv_ret_status *rrs;
1802 	struct atl1c_buffer *buffer_info;
1803 
1804 	while (1) {
1805 		if (*work_done >= work_to_do)
1806 			break;
1807 		rrs = ATL1C_RRD_DESC(rrd_ring, rrd_ring->next_to_clean);
1808 		if (likely(RRS_RXD_IS_VALID(rrs->word3))) {
1809 			rfd_num = (rrs->word0 >> RRS_RX_RFD_CNT_SHIFT) &
1810 				RRS_RX_RFD_CNT_MASK;
1811 			if (unlikely(rfd_num != 1))
1812 				/* TODO support mul rfd*/
1813 				if (netif_msg_rx_err(adapter))
1814 					dev_warn(&pdev->dev,
1815 						"Multi rfd not support yet!\n");
1816 			goto rrs_checked;
1817 		} else {
1818 			break;
1819 		}
1820 rrs_checked:
1821 		atl1c_clean_rrd(rrd_ring, rrs, rfd_num);
1822 		if (rrs->word3 & (RRS_RX_ERR_SUM | RRS_802_3_LEN_ERR)) {
1823 			atl1c_clean_rfd(rfd_ring, rrs, rfd_num);
1824 				if (netif_msg_rx_err(adapter))
1825 					dev_warn(&pdev->dev,
1826 						"wrong packet! rrs word3 is %x\n",
1827 						rrs->word3);
1828 			continue;
1829 		}
1830 
1831 		length = le16_to_cpu((rrs->word3 >> RRS_PKT_SIZE_SHIFT) &
1832 				RRS_PKT_SIZE_MASK);
1833 		/* Good Receive */
1834 		if (likely(rfd_num == 1)) {
1835 			rfd_index = (rrs->word0 >> RRS_RX_RFD_INDEX_SHIFT) &
1836 					RRS_RX_RFD_INDEX_MASK;
1837 			buffer_info = &rfd_ring->buffer_info[rfd_index];
1838 			pci_unmap_single(pdev, buffer_info->dma,
1839 				buffer_info->length, PCI_DMA_FROMDEVICE);
1840 			skb = buffer_info->skb;
1841 		} else {
1842 			/* TODO */
1843 			if (netif_msg_rx_err(adapter))
1844 				dev_warn(&pdev->dev,
1845 					"Multi rfd not support yet!\n");
1846 			break;
1847 		}
1848 		atl1c_clean_rfd(rfd_ring, rrs, rfd_num);
1849 		skb_put(skb, length - ETH_FCS_LEN);
1850 		skb->protocol = eth_type_trans(skb, netdev);
1851 		atl1c_rx_checksum(adapter, skb, rrs);
1852 		if (rrs->word3 & RRS_VLAN_INS) {
1853 			u16 vlan;
1854 
1855 			AT_TAG_TO_VLAN(rrs->vlan_tag, vlan);
1856 			vlan = le16_to_cpu(vlan);
1857 			__vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), vlan);
1858 		}
1859 		netif_receive_skb(skb);
1860 
1861 		(*work_done)++;
1862 		count++;
1863 	}
1864 	if (count)
1865 		atl1c_alloc_rx_buffer(adapter);
1866 }
1867 
1868 /**
1869  * atl1c_clean - NAPI Rx polling callback
1870  */
1871 static int atl1c_clean(struct napi_struct *napi, int budget)
1872 {
1873 	struct atl1c_adapter *adapter =
1874 			container_of(napi, struct atl1c_adapter, napi);
1875 	int work_done = 0;
1876 
1877 	/* Keep link state information with original netdev */
1878 	if (!netif_carrier_ok(adapter->netdev))
1879 		goto quit_polling;
1880 	/* just enable one RXQ */
1881 	atl1c_clean_rx_irq(adapter, &work_done, budget);
1882 
1883 	if (work_done < budget) {
1884 quit_polling:
1885 		napi_complete(napi);
1886 		adapter->hw.intr_mask |= ISR_RX_PKT;
1887 		AT_WRITE_REG(&adapter->hw, REG_IMR, adapter->hw.intr_mask);
1888 	}
1889 	return work_done;
1890 }
1891 
1892 #ifdef CONFIG_NET_POLL_CONTROLLER
1893 
1894 /*
1895  * Polling 'interrupt' - used by things like netconsole to send skbs
1896  * without having to re-enable interrupts. It's not called while
1897  * the interrupt routine is executing.
1898  */
1899 static void atl1c_netpoll(struct net_device *netdev)
1900 {
1901 	struct atl1c_adapter *adapter = netdev_priv(netdev);
1902 
1903 	disable_irq(adapter->pdev->irq);
1904 	atl1c_intr(adapter->pdev->irq, netdev);
1905 	enable_irq(adapter->pdev->irq);
1906 }
1907 #endif
1908 
1909 static inline u16 atl1c_tpd_avail(struct atl1c_adapter *adapter, enum atl1c_trans_queue type)
1910 {
1911 	struct atl1c_tpd_ring *tpd_ring = &adapter->tpd_ring[type];
1912 	u16 next_to_use = 0;
1913 	u16 next_to_clean = 0;
1914 
1915 	next_to_clean = atomic_read(&tpd_ring->next_to_clean);
1916 	next_to_use   = tpd_ring->next_to_use;
1917 
1918 	return (u16)(next_to_clean > next_to_use) ?
1919 		(next_to_clean - next_to_use - 1) :
1920 		(tpd_ring->count + next_to_clean - next_to_use - 1);
1921 }
1922 
1923 /*
1924  * get next usable tpd
1925  * Note: should call atl1c_tdp_avail to make sure
1926  * there is enough tpd to use
1927  */
1928 static struct atl1c_tpd_desc *atl1c_get_tpd(struct atl1c_adapter *adapter,
1929 	enum atl1c_trans_queue type)
1930 {
1931 	struct atl1c_tpd_ring *tpd_ring = &adapter->tpd_ring[type];
1932 	struct atl1c_tpd_desc *tpd_desc;
1933 	u16 next_to_use = 0;
1934 
1935 	next_to_use = tpd_ring->next_to_use;
1936 	if (++tpd_ring->next_to_use == tpd_ring->count)
1937 		tpd_ring->next_to_use = 0;
1938 	tpd_desc = ATL1C_TPD_DESC(tpd_ring, next_to_use);
1939 	memset(tpd_desc, 0, sizeof(struct atl1c_tpd_desc));
1940 	return	tpd_desc;
1941 }
1942 
1943 static struct atl1c_buffer *
1944 atl1c_get_tx_buffer(struct atl1c_adapter *adapter, struct atl1c_tpd_desc *tpd)
1945 {
1946 	struct atl1c_tpd_ring *tpd_ring = adapter->tpd_ring;
1947 
1948 	return &tpd_ring->buffer_info[tpd -
1949 			(struct atl1c_tpd_desc *)tpd_ring->desc];
1950 }
1951 
1952 /* Calculate the transmit packet descript needed*/
1953 static u16 atl1c_cal_tpd_req(const struct sk_buff *skb)
1954 {
1955 	u16 tpd_req;
1956 	u16 proto_hdr_len = 0;
1957 
1958 	tpd_req = skb_shinfo(skb)->nr_frags + 1;
1959 
1960 	if (skb_is_gso(skb)) {
1961 		proto_hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
1962 		if (proto_hdr_len < skb_headlen(skb))
1963 			tpd_req++;
1964 		if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6)
1965 			tpd_req++;
1966 	}
1967 	return tpd_req;
1968 }
1969 
1970 static int atl1c_tso_csum(struct atl1c_adapter *adapter,
1971 			  struct sk_buff *skb,
1972 			  struct atl1c_tpd_desc **tpd,
1973 			  enum atl1c_trans_queue type)
1974 {
1975 	struct pci_dev *pdev = adapter->pdev;
1976 	unsigned short offload_type;
1977 	u8 hdr_len;
1978 	u32 real_len;
1979 
1980 	if (skb_is_gso(skb)) {
1981 		int err;
1982 
1983 		err = skb_cow_head(skb, 0);
1984 		if (err < 0)
1985 			return err;
1986 
1987 		offload_type = skb_shinfo(skb)->gso_type;
1988 
1989 		if (offload_type & SKB_GSO_TCPV4) {
1990 			real_len = (((unsigned char *)ip_hdr(skb) - skb->data)
1991 					+ ntohs(ip_hdr(skb)->tot_len));
1992 
1993 			if (real_len < skb->len)
1994 				pskb_trim(skb, real_len);
1995 
1996 			hdr_len = (skb_transport_offset(skb) + tcp_hdrlen(skb));
1997 			if (unlikely(skb->len == hdr_len)) {
1998 				/* only xsum need */
1999 				if (netif_msg_tx_queued(adapter))
2000 					dev_warn(&pdev->dev,
2001 						"IPV4 tso with zero data??\n");
2002 				goto check_sum;
2003 			} else {
2004 				ip_hdr(skb)->check = 0;
2005 				tcp_hdr(skb)->check = ~csum_tcpudp_magic(
2006 							ip_hdr(skb)->saddr,
2007 							ip_hdr(skb)->daddr,
2008 							0, IPPROTO_TCP, 0);
2009 				(*tpd)->word1 |= 1 << TPD_IPV4_PACKET_SHIFT;
2010 			}
2011 		}
2012 
2013 		if (offload_type & SKB_GSO_TCPV6) {
2014 			struct atl1c_tpd_ext_desc *etpd =
2015 				*(struct atl1c_tpd_ext_desc **)(tpd);
2016 
2017 			memset(etpd, 0, sizeof(struct atl1c_tpd_ext_desc));
2018 			*tpd = atl1c_get_tpd(adapter, type);
2019 			ipv6_hdr(skb)->payload_len = 0;
2020 			/* check payload == 0 byte ? */
2021 			hdr_len = (skb_transport_offset(skb) + tcp_hdrlen(skb));
2022 			if (unlikely(skb->len == hdr_len)) {
2023 				/* only xsum need */
2024 				if (netif_msg_tx_queued(adapter))
2025 					dev_warn(&pdev->dev,
2026 						"IPV6 tso with zero data??\n");
2027 				goto check_sum;
2028 			} else
2029 				tcp_hdr(skb)->check = ~csum_ipv6_magic(
2030 						&ipv6_hdr(skb)->saddr,
2031 						&ipv6_hdr(skb)->daddr,
2032 						0, IPPROTO_TCP, 0);
2033 			etpd->word1 |= 1 << TPD_LSO_EN_SHIFT;
2034 			etpd->word1 |= 1 << TPD_LSO_VER_SHIFT;
2035 			etpd->pkt_len = cpu_to_le32(skb->len);
2036 			(*tpd)->word1 |= 1 << TPD_LSO_VER_SHIFT;
2037 		}
2038 
2039 		(*tpd)->word1 |= 1 << TPD_LSO_EN_SHIFT;
2040 		(*tpd)->word1 |= (skb_transport_offset(skb) & TPD_TCPHDR_OFFSET_MASK) <<
2041 				TPD_TCPHDR_OFFSET_SHIFT;
2042 		(*tpd)->word1 |= (skb_shinfo(skb)->gso_size & TPD_MSS_MASK) <<
2043 				TPD_MSS_SHIFT;
2044 		return 0;
2045 	}
2046 
2047 check_sum:
2048 	if (likely(skb->ip_summed == CHECKSUM_PARTIAL)) {
2049 		u8 css, cso;
2050 		cso = skb_checksum_start_offset(skb);
2051 
2052 		if (unlikely(cso & 0x1)) {
2053 			if (netif_msg_tx_err(adapter))
2054 				dev_err(&adapter->pdev->dev,
2055 					"payload offset should not an event number\n");
2056 			return -1;
2057 		} else {
2058 			css = cso + skb->csum_offset;
2059 
2060 			(*tpd)->word1 |= ((cso >> 1) & TPD_PLOADOFFSET_MASK) <<
2061 					TPD_PLOADOFFSET_SHIFT;
2062 			(*tpd)->word1 |= ((css >> 1) & TPD_CCSUM_OFFSET_MASK) <<
2063 					TPD_CCSUM_OFFSET_SHIFT;
2064 			(*tpd)->word1 |= 1 << TPD_CCSUM_EN_SHIFT;
2065 		}
2066 	}
2067 	return 0;
2068 }
2069 
2070 static void atl1c_tx_rollback(struct atl1c_adapter *adpt,
2071 			      struct atl1c_tpd_desc *first_tpd,
2072 			      enum atl1c_trans_queue type)
2073 {
2074 	struct atl1c_tpd_ring *tpd_ring = &adpt->tpd_ring[type];
2075 	struct atl1c_buffer *buffer_info;
2076 	struct atl1c_tpd_desc *tpd;
2077 	u16 first_index, index;
2078 
2079 	first_index = first_tpd - (struct atl1c_tpd_desc *)tpd_ring->desc;
2080 	index = first_index;
2081 	while (index != tpd_ring->next_to_use) {
2082 		tpd = ATL1C_TPD_DESC(tpd_ring, index);
2083 		buffer_info = &tpd_ring->buffer_info[index];
2084 		atl1c_clean_buffer(adpt->pdev, buffer_info);
2085 		memset(tpd, 0, sizeof(struct atl1c_tpd_desc));
2086 		if (++index == tpd_ring->count)
2087 			index = 0;
2088 	}
2089 	tpd_ring->next_to_use = first_index;
2090 }
2091 
2092 static int atl1c_tx_map(struct atl1c_adapter *adapter,
2093 		      struct sk_buff *skb, struct atl1c_tpd_desc *tpd,
2094 			enum atl1c_trans_queue type)
2095 {
2096 	struct atl1c_tpd_desc *use_tpd = NULL;
2097 	struct atl1c_buffer *buffer_info = NULL;
2098 	u16 buf_len = skb_headlen(skb);
2099 	u16 map_len = 0;
2100 	u16 mapped_len = 0;
2101 	u16 hdr_len = 0;
2102 	u16 nr_frags;
2103 	u16 f;
2104 	int tso;
2105 
2106 	nr_frags = skb_shinfo(skb)->nr_frags;
2107 	tso = (tpd->word1 >> TPD_LSO_EN_SHIFT) & TPD_LSO_EN_MASK;
2108 	if (tso) {
2109 		/* TSO */
2110 		map_len = hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
2111 		use_tpd = tpd;
2112 
2113 		buffer_info = atl1c_get_tx_buffer(adapter, use_tpd);
2114 		buffer_info->length = map_len;
2115 		buffer_info->dma = pci_map_single(adapter->pdev,
2116 					skb->data, hdr_len, PCI_DMA_TODEVICE);
2117 		if (unlikely(pci_dma_mapping_error(adapter->pdev,
2118 						   buffer_info->dma)))
2119 			goto err_dma;
2120 		ATL1C_SET_BUFFER_STATE(buffer_info, ATL1C_BUFFER_BUSY);
2121 		ATL1C_SET_PCIMAP_TYPE(buffer_info, ATL1C_PCIMAP_SINGLE,
2122 			ATL1C_PCIMAP_TODEVICE);
2123 		mapped_len += map_len;
2124 		use_tpd->buffer_addr = cpu_to_le64(buffer_info->dma);
2125 		use_tpd->buffer_len = cpu_to_le16(buffer_info->length);
2126 	}
2127 
2128 	if (mapped_len < buf_len) {
2129 		/* mapped_len == 0, means we should use the first tpd,
2130 		   which is given by caller  */
2131 		if (mapped_len == 0)
2132 			use_tpd = tpd;
2133 		else {
2134 			use_tpd = atl1c_get_tpd(adapter, type);
2135 			memcpy(use_tpd, tpd, sizeof(struct atl1c_tpd_desc));
2136 		}
2137 		buffer_info = atl1c_get_tx_buffer(adapter, use_tpd);
2138 		buffer_info->length = buf_len - mapped_len;
2139 		buffer_info->dma =
2140 			pci_map_single(adapter->pdev, skb->data + mapped_len,
2141 					buffer_info->length, PCI_DMA_TODEVICE);
2142 		if (unlikely(pci_dma_mapping_error(adapter->pdev,
2143 						   buffer_info->dma)))
2144 			goto err_dma;
2145 
2146 		ATL1C_SET_BUFFER_STATE(buffer_info, ATL1C_BUFFER_BUSY);
2147 		ATL1C_SET_PCIMAP_TYPE(buffer_info, ATL1C_PCIMAP_SINGLE,
2148 			ATL1C_PCIMAP_TODEVICE);
2149 		use_tpd->buffer_addr = cpu_to_le64(buffer_info->dma);
2150 		use_tpd->buffer_len  = cpu_to_le16(buffer_info->length);
2151 	}
2152 
2153 	for (f = 0; f < nr_frags; f++) {
2154 		struct skb_frag_struct *frag;
2155 
2156 		frag = &skb_shinfo(skb)->frags[f];
2157 
2158 		use_tpd = atl1c_get_tpd(adapter, type);
2159 		memcpy(use_tpd, tpd, sizeof(struct atl1c_tpd_desc));
2160 
2161 		buffer_info = atl1c_get_tx_buffer(adapter, use_tpd);
2162 		buffer_info->length = skb_frag_size(frag);
2163 		buffer_info->dma = skb_frag_dma_map(&adapter->pdev->dev,
2164 						    frag, 0,
2165 						    buffer_info->length,
2166 						    DMA_TO_DEVICE);
2167 		if (dma_mapping_error(&adapter->pdev->dev, buffer_info->dma))
2168 			goto err_dma;
2169 
2170 		ATL1C_SET_BUFFER_STATE(buffer_info, ATL1C_BUFFER_BUSY);
2171 		ATL1C_SET_PCIMAP_TYPE(buffer_info, ATL1C_PCIMAP_PAGE,
2172 			ATL1C_PCIMAP_TODEVICE);
2173 		use_tpd->buffer_addr = cpu_to_le64(buffer_info->dma);
2174 		use_tpd->buffer_len  = cpu_to_le16(buffer_info->length);
2175 	}
2176 
2177 	/* The last tpd */
2178 	use_tpd->word1 |= 1 << TPD_EOP_SHIFT;
2179 	/* The last buffer info contain the skb address,
2180 	   so it will be free after unmap */
2181 	buffer_info->skb = skb;
2182 
2183 	return 0;
2184 
2185 err_dma:
2186 	buffer_info->dma = 0;
2187 	buffer_info->length = 0;
2188 	return -1;
2189 }
2190 
2191 static void atl1c_tx_queue(struct atl1c_adapter *adapter, struct sk_buff *skb,
2192 			   struct atl1c_tpd_desc *tpd, enum atl1c_trans_queue type)
2193 {
2194 	struct atl1c_tpd_ring *tpd_ring = &adapter->tpd_ring[type];
2195 	u16 reg;
2196 
2197 	reg = type == atl1c_trans_high ? REG_TPD_PRI1_PIDX : REG_TPD_PRI0_PIDX;
2198 	AT_WRITE_REGW(&adapter->hw, reg, tpd_ring->next_to_use);
2199 }
2200 
2201 static netdev_tx_t atl1c_xmit_frame(struct sk_buff *skb,
2202 					  struct net_device *netdev)
2203 {
2204 	struct atl1c_adapter *adapter = netdev_priv(netdev);
2205 	unsigned long flags;
2206 	u16 tpd_req = 1;
2207 	struct atl1c_tpd_desc *tpd;
2208 	enum atl1c_trans_queue type = atl1c_trans_normal;
2209 
2210 	if (test_bit(__AT_DOWN, &adapter->flags)) {
2211 		dev_kfree_skb_any(skb);
2212 		return NETDEV_TX_OK;
2213 	}
2214 
2215 	tpd_req = atl1c_cal_tpd_req(skb);
2216 	if (!spin_trylock_irqsave(&adapter->tx_lock, flags)) {
2217 		if (netif_msg_pktdata(adapter))
2218 			dev_info(&adapter->pdev->dev, "tx locked\n");
2219 		return NETDEV_TX_LOCKED;
2220 	}
2221 
2222 	if (atl1c_tpd_avail(adapter, type) < tpd_req) {
2223 		/* no enough descriptor, just stop queue */
2224 		netif_stop_queue(netdev);
2225 		spin_unlock_irqrestore(&adapter->tx_lock, flags);
2226 		return NETDEV_TX_BUSY;
2227 	}
2228 
2229 	tpd = atl1c_get_tpd(adapter, type);
2230 
2231 	/* do TSO and check sum */
2232 	if (atl1c_tso_csum(adapter, skb, &tpd, type) != 0) {
2233 		spin_unlock_irqrestore(&adapter->tx_lock, flags);
2234 		dev_kfree_skb_any(skb);
2235 		return NETDEV_TX_OK;
2236 	}
2237 
2238 	if (unlikely(skb_vlan_tag_present(skb))) {
2239 		u16 vlan = skb_vlan_tag_get(skb);
2240 		__le16 tag;
2241 
2242 		vlan = cpu_to_le16(vlan);
2243 		AT_VLAN_TO_TAG(vlan, tag);
2244 		tpd->word1 |= 1 << TPD_INS_VTAG_SHIFT;
2245 		tpd->vlan_tag = tag;
2246 	}
2247 
2248 	if (skb_network_offset(skb) != ETH_HLEN)
2249 		tpd->word1 |= 1 << TPD_ETH_TYPE_SHIFT; /* Ethernet frame */
2250 
2251 	if (atl1c_tx_map(adapter, skb, tpd, type) < 0) {
2252 		netif_info(adapter, tx_done, adapter->netdev,
2253 			   "tx-skb droppted due to dma error\n");
2254 		/* roll back tpd/buffer */
2255 		atl1c_tx_rollback(adapter, tpd, type);
2256 		spin_unlock_irqrestore(&adapter->tx_lock, flags);
2257 		dev_kfree_skb_any(skb);
2258 	} else {
2259 		atl1c_tx_queue(adapter, skb, tpd, type);
2260 		spin_unlock_irqrestore(&adapter->tx_lock, flags);
2261 	}
2262 
2263 	return NETDEV_TX_OK;
2264 }
2265 
2266 static void atl1c_free_irq(struct atl1c_adapter *adapter)
2267 {
2268 	struct net_device *netdev = adapter->netdev;
2269 
2270 	free_irq(adapter->pdev->irq, netdev);
2271 
2272 	if (adapter->have_msi)
2273 		pci_disable_msi(adapter->pdev);
2274 }
2275 
2276 static int atl1c_request_irq(struct atl1c_adapter *adapter)
2277 {
2278 	struct pci_dev    *pdev   = adapter->pdev;
2279 	struct net_device *netdev = adapter->netdev;
2280 	int flags = 0;
2281 	int err = 0;
2282 
2283 	adapter->have_msi = true;
2284 	err = pci_enable_msi(adapter->pdev);
2285 	if (err) {
2286 		if (netif_msg_ifup(adapter))
2287 			dev_err(&pdev->dev,
2288 				"Unable to allocate MSI interrupt Error: %d\n",
2289 				err);
2290 		adapter->have_msi = false;
2291 	}
2292 
2293 	if (!adapter->have_msi)
2294 		flags |= IRQF_SHARED;
2295 	err = request_irq(adapter->pdev->irq, atl1c_intr, flags,
2296 			netdev->name, netdev);
2297 	if (err) {
2298 		if (netif_msg_ifup(adapter))
2299 			dev_err(&pdev->dev,
2300 				"Unable to allocate interrupt Error: %d\n",
2301 				err);
2302 		if (adapter->have_msi)
2303 			pci_disable_msi(adapter->pdev);
2304 		return err;
2305 	}
2306 	if (netif_msg_ifup(adapter))
2307 		dev_dbg(&pdev->dev, "atl1c_request_irq OK\n");
2308 	return err;
2309 }
2310 
2311 
2312 static void atl1c_reset_dma_ring(struct atl1c_adapter *adapter)
2313 {
2314 	/* release tx-pending skbs and reset tx/rx ring index */
2315 	atl1c_clean_tx_ring(adapter, atl1c_trans_normal);
2316 	atl1c_clean_tx_ring(adapter, atl1c_trans_high);
2317 	atl1c_clean_rx_ring(adapter);
2318 }
2319 
2320 static int atl1c_up(struct atl1c_adapter *adapter)
2321 {
2322 	struct net_device *netdev = adapter->netdev;
2323 	int err;
2324 
2325 	netif_carrier_off(netdev);
2326 
2327 	err = atl1c_configure(adapter);
2328 	if (unlikely(err))
2329 		goto err_up;
2330 
2331 	err = atl1c_request_irq(adapter);
2332 	if (unlikely(err))
2333 		goto err_up;
2334 
2335 	atl1c_check_link_status(adapter);
2336 	clear_bit(__AT_DOWN, &adapter->flags);
2337 	napi_enable(&adapter->napi);
2338 	atl1c_irq_enable(adapter);
2339 	netif_start_queue(netdev);
2340 	return err;
2341 
2342 err_up:
2343 	atl1c_clean_rx_ring(adapter);
2344 	return err;
2345 }
2346 
2347 static void atl1c_down(struct atl1c_adapter *adapter)
2348 {
2349 	struct net_device *netdev = adapter->netdev;
2350 
2351 	atl1c_del_timer(adapter);
2352 	adapter->work_event = 0; /* clear all event */
2353 	/* signal that we're down so the interrupt handler does not
2354 	 * reschedule our watchdog timer */
2355 	set_bit(__AT_DOWN, &adapter->flags);
2356 	netif_carrier_off(netdev);
2357 	napi_disable(&adapter->napi);
2358 	atl1c_irq_disable(adapter);
2359 	atl1c_free_irq(adapter);
2360 	/* disable ASPM if device inactive */
2361 	atl1c_disable_l0s_l1(&adapter->hw);
2362 	/* reset MAC to disable all RX/TX */
2363 	atl1c_reset_mac(&adapter->hw);
2364 	msleep(1);
2365 
2366 	adapter->link_speed = SPEED_0;
2367 	adapter->link_duplex = -1;
2368 	atl1c_reset_dma_ring(adapter);
2369 }
2370 
2371 /**
2372  * atl1c_open - Called when a network interface is made active
2373  * @netdev: network interface device structure
2374  *
2375  * Returns 0 on success, negative value on failure
2376  *
2377  * The open entry point is called when a network interface is made
2378  * active by the system (IFF_UP).  At this point all resources needed
2379  * for transmit and receive operations are allocated, the interrupt
2380  * handler is registered with the OS, the watchdog timer is started,
2381  * and the stack is notified that the interface is ready.
2382  */
2383 static int atl1c_open(struct net_device *netdev)
2384 {
2385 	struct atl1c_adapter *adapter = netdev_priv(netdev);
2386 	int err;
2387 
2388 	/* disallow open during test */
2389 	if (test_bit(__AT_TESTING, &adapter->flags))
2390 		return -EBUSY;
2391 
2392 	/* allocate rx/tx dma buffer & descriptors */
2393 	err = atl1c_setup_ring_resources(adapter);
2394 	if (unlikely(err))
2395 		return err;
2396 
2397 	err = atl1c_up(adapter);
2398 	if (unlikely(err))
2399 		goto err_up;
2400 
2401 	return 0;
2402 
2403 err_up:
2404 	atl1c_free_irq(adapter);
2405 	atl1c_free_ring_resources(adapter);
2406 	atl1c_reset_mac(&adapter->hw);
2407 	return err;
2408 }
2409 
2410 /**
2411  * atl1c_close - Disables a network interface
2412  * @netdev: network interface device structure
2413  *
2414  * Returns 0, this is not allowed to fail
2415  *
2416  * The close entry point is called when an interface is de-activated
2417  * by the OS.  The hardware is still under the drivers control, but
2418  * needs to be disabled.  A global MAC reset is issued to stop the
2419  * hardware, and all transmit and receive resources are freed.
2420  */
2421 static int atl1c_close(struct net_device *netdev)
2422 {
2423 	struct atl1c_adapter *adapter = netdev_priv(netdev);
2424 
2425 	WARN_ON(test_bit(__AT_RESETTING, &adapter->flags));
2426 	set_bit(__AT_DOWN, &adapter->flags);
2427 	cancel_work_sync(&adapter->common_task);
2428 	atl1c_down(adapter);
2429 	atl1c_free_ring_resources(adapter);
2430 	return 0;
2431 }
2432 
2433 static int atl1c_suspend(struct device *dev)
2434 {
2435 	struct pci_dev *pdev = to_pci_dev(dev);
2436 	struct net_device *netdev = pci_get_drvdata(pdev);
2437 	struct atl1c_adapter *adapter = netdev_priv(netdev);
2438 	struct atl1c_hw *hw = &adapter->hw;
2439 	u32 wufc = adapter->wol;
2440 
2441 	atl1c_disable_l0s_l1(hw);
2442 	if (netif_running(netdev)) {
2443 		WARN_ON(test_bit(__AT_RESETTING, &adapter->flags));
2444 		atl1c_down(adapter);
2445 	}
2446 	netif_device_detach(netdev);
2447 
2448 	if (wufc)
2449 		if (atl1c_phy_to_ps_link(hw) != 0)
2450 			dev_dbg(&pdev->dev, "phy power saving failed");
2451 
2452 	atl1c_power_saving(hw, wufc);
2453 
2454 	return 0;
2455 }
2456 
2457 #ifdef CONFIG_PM_SLEEP
2458 static int atl1c_resume(struct device *dev)
2459 {
2460 	struct pci_dev *pdev = to_pci_dev(dev);
2461 	struct net_device *netdev = pci_get_drvdata(pdev);
2462 	struct atl1c_adapter *adapter = netdev_priv(netdev);
2463 
2464 	AT_WRITE_REG(&adapter->hw, REG_WOL_CTRL, 0);
2465 	atl1c_reset_pcie(&adapter->hw, ATL1C_PCIE_L0S_L1_DISABLE);
2466 
2467 	atl1c_phy_reset(&adapter->hw);
2468 	atl1c_reset_mac(&adapter->hw);
2469 	atl1c_phy_init(&adapter->hw);
2470 
2471 #if 0
2472 	AT_READ_REG(&adapter->hw, REG_PM_CTRLSTAT, &pm_data);
2473 	pm_data &= ~PM_CTRLSTAT_PME_EN;
2474 	AT_WRITE_REG(&adapter->hw, REG_PM_CTRLSTAT, pm_data);
2475 #endif
2476 
2477 	netif_device_attach(netdev);
2478 	if (netif_running(netdev))
2479 		atl1c_up(adapter);
2480 
2481 	return 0;
2482 }
2483 #endif
2484 
2485 static void atl1c_shutdown(struct pci_dev *pdev)
2486 {
2487 	struct net_device *netdev = pci_get_drvdata(pdev);
2488 	struct atl1c_adapter *adapter = netdev_priv(netdev);
2489 
2490 	atl1c_suspend(&pdev->dev);
2491 	pci_wake_from_d3(pdev, adapter->wol);
2492 	pci_set_power_state(pdev, PCI_D3hot);
2493 }
2494 
2495 static const struct net_device_ops atl1c_netdev_ops = {
2496 	.ndo_open		= atl1c_open,
2497 	.ndo_stop		= atl1c_close,
2498 	.ndo_validate_addr	= eth_validate_addr,
2499 	.ndo_start_xmit		= atl1c_xmit_frame,
2500 	.ndo_set_mac_address	= atl1c_set_mac_addr,
2501 	.ndo_set_rx_mode	= atl1c_set_multi,
2502 	.ndo_change_mtu		= atl1c_change_mtu,
2503 	.ndo_fix_features	= atl1c_fix_features,
2504 	.ndo_set_features	= atl1c_set_features,
2505 	.ndo_do_ioctl		= atl1c_ioctl,
2506 	.ndo_tx_timeout		= atl1c_tx_timeout,
2507 	.ndo_get_stats		= atl1c_get_stats,
2508 #ifdef CONFIG_NET_POLL_CONTROLLER
2509 	.ndo_poll_controller	= atl1c_netpoll,
2510 #endif
2511 };
2512 
2513 static int atl1c_init_netdev(struct net_device *netdev, struct pci_dev *pdev)
2514 {
2515 	SET_NETDEV_DEV(netdev, &pdev->dev);
2516 	pci_set_drvdata(pdev, netdev);
2517 
2518 	netdev->netdev_ops = &atl1c_netdev_ops;
2519 	netdev->watchdog_timeo = AT_TX_WATCHDOG;
2520 	atl1c_set_ethtool_ops(netdev);
2521 
2522 	/* TODO: add when ready */
2523 	netdev->hw_features =	NETIF_F_SG		|
2524 				NETIF_F_HW_CSUM		|
2525 				NETIF_F_HW_VLAN_CTAG_RX	|
2526 				NETIF_F_TSO		|
2527 				NETIF_F_TSO6;
2528 	netdev->features =	netdev->hw_features	|
2529 				NETIF_F_HW_VLAN_CTAG_TX;
2530 	return 0;
2531 }
2532 
2533 /**
2534  * atl1c_probe - Device Initialization Routine
2535  * @pdev: PCI device information struct
2536  * @ent: entry in atl1c_pci_tbl
2537  *
2538  * Returns 0 on success, negative on failure
2539  *
2540  * atl1c_probe initializes an adapter identified by a pci_dev structure.
2541  * The OS initialization, configuring of the adapter private structure,
2542  * and a hardware reset occur.
2543  */
2544 static int atl1c_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
2545 {
2546 	struct net_device *netdev;
2547 	struct atl1c_adapter *adapter;
2548 	static int cards_found;
2549 
2550 	int err = 0;
2551 
2552 	/* enable device (incl. PCI PM wakeup and hotplug setup) */
2553 	err = pci_enable_device_mem(pdev);
2554 	if (err) {
2555 		dev_err(&pdev->dev, "cannot enable PCI device\n");
2556 		return err;
2557 	}
2558 
2559 	/*
2560 	 * The atl1c chip can DMA to 64-bit addresses, but it uses a single
2561 	 * shared register for the high 32 bits, so only a single, aligned,
2562 	 * 4 GB physical address range can be used at a time.
2563 	 *
2564 	 * Supporting 64-bit DMA on this hardware is more trouble than it's
2565 	 * worth.  It is far easier to limit to 32-bit DMA than update
2566 	 * various kernel subsystems to support the mechanics required by a
2567 	 * fixed-high-32-bit system.
2568 	 */
2569 	if ((pci_set_dma_mask(pdev, DMA_BIT_MASK(32)) != 0) ||
2570 	    (pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32)) != 0)) {
2571 		dev_err(&pdev->dev, "No usable DMA configuration,aborting\n");
2572 		goto err_dma;
2573 	}
2574 
2575 	err = pci_request_regions(pdev, atl1c_driver_name);
2576 	if (err) {
2577 		dev_err(&pdev->dev, "cannot obtain PCI resources\n");
2578 		goto err_pci_reg;
2579 	}
2580 
2581 	pci_set_master(pdev);
2582 
2583 	netdev = alloc_etherdev(sizeof(struct atl1c_adapter));
2584 	if (netdev == NULL) {
2585 		err = -ENOMEM;
2586 		goto err_alloc_etherdev;
2587 	}
2588 
2589 	err = atl1c_init_netdev(netdev, pdev);
2590 	if (err) {
2591 		dev_err(&pdev->dev, "init netdevice failed\n");
2592 		goto err_init_netdev;
2593 	}
2594 	adapter = netdev_priv(netdev);
2595 	adapter->bd_number = cards_found;
2596 	adapter->netdev = netdev;
2597 	adapter->pdev = pdev;
2598 	adapter->hw.adapter = adapter;
2599 	adapter->msg_enable = netif_msg_init(-1, atl1c_default_msg);
2600 	adapter->hw.hw_addr = ioremap(pci_resource_start(pdev, 0), pci_resource_len(pdev, 0));
2601 	if (!adapter->hw.hw_addr) {
2602 		err = -EIO;
2603 		dev_err(&pdev->dev, "cannot map device registers\n");
2604 		goto err_ioremap;
2605 	}
2606 
2607 	/* init mii data */
2608 	adapter->mii.dev = netdev;
2609 	adapter->mii.mdio_read  = atl1c_mdio_read;
2610 	adapter->mii.mdio_write = atl1c_mdio_write;
2611 	adapter->mii.phy_id_mask = 0x1f;
2612 	adapter->mii.reg_num_mask = MDIO_CTRL_REG_MASK;
2613 	netif_napi_add(netdev, &adapter->napi, atl1c_clean, 64);
2614 	setup_timer(&adapter->phy_config_timer, atl1c_phy_config,
2615 			(unsigned long)adapter);
2616 	/* setup the private structure */
2617 	err = atl1c_sw_init(adapter);
2618 	if (err) {
2619 		dev_err(&pdev->dev, "net device private data init failed\n");
2620 		goto err_sw_init;
2621 	}
2622 	atl1c_reset_pcie(&adapter->hw, ATL1C_PCIE_L0S_L1_DISABLE);
2623 
2624 	/* Init GPHY as early as possible due to power saving issue  */
2625 	atl1c_phy_reset(&adapter->hw);
2626 
2627 	err = atl1c_reset_mac(&adapter->hw);
2628 	if (err) {
2629 		err = -EIO;
2630 		goto err_reset;
2631 	}
2632 
2633 	/* reset the controller to
2634 	 * put the device in a known good starting state */
2635 	err = atl1c_phy_init(&adapter->hw);
2636 	if (err) {
2637 		err = -EIO;
2638 		goto err_reset;
2639 	}
2640 	if (atl1c_read_mac_addr(&adapter->hw)) {
2641 		/* got a random MAC address, set NET_ADDR_RANDOM to netdev */
2642 		netdev->addr_assign_type = NET_ADDR_RANDOM;
2643 	}
2644 	memcpy(netdev->dev_addr, adapter->hw.mac_addr, netdev->addr_len);
2645 	if (netif_msg_probe(adapter))
2646 		dev_dbg(&pdev->dev, "mac address : %pM\n",
2647 			adapter->hw.mac_addr);
2648 
2649 	atl1c_hw_set_mac_addr(&adapter->hw, adapter->hw.mac_addr);
2650 	INIT_WORK(&adapter->common_task, atl1c_common_task);
2651 	adapter->work_event = 0;
2652 	err = register_netdev(netdev);
2653 	if (err) {
2654 		dev_err(&pdev->dev, "register netdevice failed\n");
2655 		goto err_register;
2656 	}
2657 
2658 	if (netif_msg_probe(adapter))
2659 		dev_info(&pdev->dev, "version %s\n", ATL1C_DRV_VERSION);
2660 	cards_found++;
2661 	return 0;
2662 
2663 err_reset:
2664 err_register:
2665 err_sw_init:
2666 	iounmap(adapter->hw.hw_addr);
2667 err_init_netdev:
2668 err_ioremap:
2669 	free_netdev(netdev);
2670 err_alloc_etherdev:
2671 	pci_release_regions(pdev);
2672 err_pci_reg:
2673 err_dma:
2674 	pci_disable_device(pdev);
2675 	return err;
2676 }
2677 
2678 /**
2679  * atl1c_remove - Device Removal Routine
2680  * @pdev: PCI device information struct
2681  *
2682  * atl1c_remove is called by the PCI subsystem to alert the driver
2683  * that it should release a PCI device.  The could be caused by a
2684  * Hot-Plug event, or because the driver is going to be removed from
2685  * memory.
2686  */
2687 static void atl1c_remove(struct pci_dev *pdev)
2688 {
2689 	struct net_device *netdev = pci_get_drvdata(pdev);
2690 	struct atl1c_adapter *adapter = netdev_priv(netdev);
2691 
2692 	unregister_netdev(netdev);
2693 	/* restore permanent address */
2694 	atl1c_hw_set_mac_addr(&adapter->hw, adapter->hw.perm_mac_addr);
2695 	atl1c_phy_disable(&adapter->hw);
2696 
2697 	iounmap(adapter->hw.hw_addr);
2698 
2699 	pci_release_regions(pdev);
2700 	pci_disable_device(pdev);
2701 	free_netdev(netdev);
2702 }
2703 
2704 /**
2705  * atl1c_io_error_detected - called when PCI error is detected
2706  * @pdev: Pointer to PCI device
2707  * @state: The current pci connection state
2708  *
2709  * This function is called after a PCI bus error affecting
2710  * this device has been detected.
2711  */
2712 static pci_ers_result_t atl1c_io_error_detected(struct pci_dev *pdev,
2713 						pci_channel_state_t state)
2714 {
2715 	struct net_device *netdev = pci_get_drvdata(pdev);
2716 	struct atl1c_adapter *adapter = netdev_priv(netdev);
2717 
2718 	netif_device_detach(netdev);
2719 
2720 	if (state == pci_channel_io_perm_failure)
2721 		return PCI_ERS_RESULT_DISCONNECT;
2722 
2723 	if (netif_running(netdev))
2724 		atl1c_down(adapter);
2725 
2726 	pci_disable_device(pdev);
2727 
2728 	/* Request a slot slot reset. */
2729 	return PCI_ERS_RESULT_NEED_RESET;
2730 }
2731 
2732 /**
2733  * atl1c_io_slot_reset - called after the pci bus has been reset.
2734  * @pdev: Pointer to PCI device
2735  *
2736  * Restart the card from scratch, as if from a cold-boot. Implementation
2737  * resembles the first-half of the e1000_resume routine.
2738  */
2739 static pci_ers_result_t atl1c_io_slot_reset(struct pci_dev *pdev)
2740 {
2741 	struct net_device *netdev = pci_get_drvdata(pdev);
2742 	struct atl1c_adapter *adapter = netdev_priv(netdev);
2743 
2744 	if (pci_enable_device(pdev)) {
2745 		if (netif_msg_hw(adapter))
2746 			dev_err(&pdev->dev,
2747 				"Cannot re-enable PCI device after reset\n");
2748 		return PCI_ERS_RESULT_DISCONNECT;
2749 	}
2750 	pci_set_master(pdev);
2751 
2752 	pci_enable_wake(pdev, PCI_D3hot, 0);
2753 	pci_enable_wake(pdev, PCI_D3cold, 0);
2754 
2755 	atl1c_reset_mac(&adapter->hw);
2756 
2757 	return PCI_ERS_RESULT_RECOVERED;
2758 }
2759 
2760 /**
2761  * atl1c_io_resume - called when traffic can start flowing again.
2762  * @pdev: Pointer to PCI device
2763  *
2764  * This callback is called when the error recovery driver tells us that
2765  * its OK to resume normal operation. Implementation resembles the
2766  * second-half of the atl1c_resume routine.
2767  */
2768 static void atl1c_io_resume(struct pci_dev *pdev)
2769 {
2770 	struct net_device *netdev = pci_get_drvdata(pdev);
2771 	struct atl1c_adapter *adapter = netdev_priv(netdev);
2772 
2773 	if (netif_running(netdev)) {
2774 		if (atl1c_up(adapter)) {
2775 			if (netif_msg_hw(adapter))
2776 				dev_err(&pdev->dev,
2777 					"Cannot bring device back up after reset\n");
2778 			return;
2779 		}
2780 	}
2781 
2782 	netif_device_attach(netdev);
2783 }
2784 
2785 static const struct pci_error_handlers atl1c_err_handler = {
2786 	.error_detected = atl1c_io_error_detected,
2787 	.slot_reset = atl1c_io_slot_reset,
2788 	.resume = atl1c_io_resume,
2789 };
2790 
2791 static SIMPLE_DEV_PM_OPS(atl1c_pm_ops, atl1c_suspend, atl1c_resume);
2792 
2793 static struct pci_driver atl1c_driver = {
2794 	.name     = atl1c_driver_name,
2795 	.id_table = atl1c_pci_tbl,
2796 	.probe    = atl1c_probe,
2797 	.remove   = atl1c_remove,
2798 	.shutdown = atl1c_shutdown,
2799 	.err_handler = &atl1c_err_handler,
2800 	.driver.pm = &atl1c_pm_ops,
2801 };
2802 
2803 module_pci_driver(atl1c_driver);
2804