1 /* SPDX-License-Identifier: GPL-2.0+ */
2 /* Copyright (C) 2018 Microchip Technology Inc. */
3 
4 #include <linux/module.h>
5 #include <linux/pci.h>
6 #include <linux/netdevice.h>
7 #include <linux/etherdevice.h>
8 #include <linux/crc32.h>
9 #include <linux/microchipphy.h>
10 #include <linux/net_tstamp.h>
11 #include <linux/of_mdio.h>
12 #include <linux/of_net.h>
13 #include <linux/phy.h>
14 #include <linux/phy_fixed.h>
15 #include <linux/rtnetlink.h>
16 #include <linux/iopoll.h>
17 #include <linux/crc16.h>
18 #include "lan743x_main.h"
19 #include "lan743x_ethtool.h"
20 
21 static void lan743x_pci_cleanup(struct lan743x_adapter *adapter)
22 {
23 	pci_release_selected_regions(adapter->pdev,
24 				     pci_select_bars(adapter->pdev,
25 						     IORESOURCE_MEM));
26 	pci_disable_device(adapter->pdev);
27 }
28 
29 static int lan743x_pci_init(struct lan743x_adapter *adapter,
30 			    struct pci_dev *pdev)
31 {
32 	unsigned long bars = 0;
33 	int ret;
34 
35 	adapter->pdev = pdev;
36 	ret = pci_enable_device_mem(pdev);
37 	if (ret)
38 		goto return_error;
39 
40 	netif_info(adapter, probe, adapter->netdev,
41 		   "PCI: Vendor ID = 0x%04X, Device ID = 0x%04X\n",
42 		   pdev->vendor, pdev->device);
43 	bars = pci_select_bars(pdev, IORESOURCE_MEM);
44 	if (!test_bit(0, &bars))
45 		goto disable_device;
46 
47 	ret = pci_request_selected_regions(pdev, bars, DRIVER_NAME);
48 	if (ret)
49 		goto disable_device;
50 
51 	pci_set_master(pdev);
52 	return 0;
53 
54 disable_device:
55 	pci_disable_device(adapter->pdev);
56 
57 return_error:
58 	return ret;
59 }
60 
61 u32 lan743x_csr_read(struct lan743x_adapter *adapter, int offset)
62 {
63 	return ioread32(&adapter->csr.csr_address[offset]);
64 }
65 
66 void lan743x_csr_write(struct lan743x_adapter *adapter, int offset,
67 		       u32 data)
68 {
69 	iowrite32(data, &adapter->csr.csr_address[offset]);
70 }
71 
72 #define LAN743X_CSR_READ_OP(offset)	lan743x_csr_read(adapter, offset)
73 
74 static int lan743x_csr_light_reset(struct lan743x_adapter *adapter)
75 {
76 	u32 data;
77 
78 	data = lan743x_csr_read(adapter, HW_CFG);
79 	data |= HW_CFG_LRST_;
80 	lan743x_csr_write(adapter, HW_CFG, data);
81 
82 	return readx_poll_timeout(LAN743X_CSR_READ_OP, HW_CFG, data,
83 				  !(data & HW_CFG_LRST_), 100000, 10000000);
84 }
85 
86 static int lan743x_csr_wait_for_bit(struct lan743x_adapter *adapter,
87 				    int offset, u32 bit_mask,
88 				    int target_value, int usleep_min,
89 				    int usleep_max, int count)
90 {
91 	u32 data;
92 
93 	return readx_poll_timeout(LAN743X_CSR_READ_OP, offset, data,
94 				  target_value == ((data & bit_mask) ? 1 : 0),
95 				  usleep_max, usleep_min * count);
96 }
97 
98 static int lan743x_csr_init(struct lan743x_adapter *adapter)
99 {
100 	struct lan743x_csr *csr = &adapter->csr;
101 	resource_size_t bar_start, bar_length;
102 	int result;
103 
104 	bar_start = pci_resource_start(adapter->pdev, 0);
105 	bar_length = pci_resource_len(adapter->pdev, 0);
106 	csr->csr_address = devm_ioremap(&adapter->pdev->dev,
107 					bar_start, bar_length);
108 	if (!csr->csr_address) {
109 		result = -ENOMEM;
110 		goto clean_up;
111 	}
112 
113 	csr->id_rev = lan743x_csr_read(adapter, ID_REV);
114 	csr->fpga_rev = lan743x_csr_read(adapter, FPGA_REV);
115 	netif_info(adapter, probe, adapter->netdev,
116 		   "ID_REV = 0x%08X, FPGA_REV = %d.%d\n",
117 		   csr->id_rev,	FPGA_REV_GET_MAJOR_(csr->fpga_rev),
118 		   FPGA_REV_GET_MINOR_(csr->fpga_rev));
119 	if (!ID_REV_IS_VALID_CHIP_ID_(csr->id_rev)) {
120 		result = -ENODEV;
121 		goto clean_up;
122 	}
123 
124 	csr->flags = LAN743X_CSR_FLAG_SUPPORTS_INTR_AUTO_SET_CLR;
125 	switch (csr->id_rev & ID_REV_CHIP_REV_MASK_) {
126 	case ID_REV_CHIP_REV_A0_:
127 		csr->flags |= LAN743X_CSR_FLAG_IS_A0;
128 		csr->flags &= ~LAN743X_CSR_FLAG_SUPPORTS_INTR_AUTO_SET_CLR;
129 		break;
130 	case ID_REV_CHIP_REV_B0_:
131 		csr->flags |= LAN743X_CSR_FLAG_IS_B0;
132 		break;
133 	}
134 
135 	result = lan743x_csr_light_reset(adapter);
136 	if (result)
137 		goto clean_up;
138 	return 0;
139 clean_up:
140 	return result;
141 }
142 
143 static void lan743x_intr_software_isr(struct lan743x_adapter *adapter)
144 {
145 	struct lan743x_intr *intr = &adapter->intr;
146 
147 	/* disable the interrupt to prevent repeated re-triggering */
148 	lan743x_csr_write(adapter, INT_EN_CLR, INT_BIT_SW_GP_);
149 	intr->software_isr_flag = true;
150 	wake_up(&intr->software_isr_wq);
151 }
152 
153 static void lan743x_tx_isr(void *context, u32 int_sts, u32 flags)
154 {
155 	struct lan743x_tx *tx = context;
156 	struct lan743x_adapter *adapter = tx->adapter;
157 	bool enable_flag = true;
158 
159 	lan743x_csr_read(adapter, INT_EN_SET);
160 	if (flags & LAN743X_VECTOR_FLAG_SOURCE_ENABLE_CLEAR) {
161 		lan743x_csr_write(adapter, INT_EN_CLR,
162 				  INT_BIT_DMA_TX_(tx->channel_number));
163 	}
164 
165 	if (int_sts & INT_BIT_DMA_TX_(tx->channel_number)) {
166 		u32 ioc_bit = DMAC_INT_BIT_TX_IOC_(tx->channel_number);
167 		u32 dmac_int_sts;
168 		u32 dmac_int_en;
169 
170 		if (flags & LAN743X_VECTOR_FLAG_SOURCE_STATUS_READ)
171 			dmac_int_sts = lan743x_csr_read(adapter, DMAC_INT_STS);
172 		else
173 			dmac_int_sts = ioc_bit;
174 		if (flags & LAN743X_VECTOR_FLAG_SOURCE_ENABLE_CHECK)
175 			dmac_int_en = lan743x_csr_read(adapter,
176 						       DMAC_INT_EN_SET);
177 		else
178 			dmac_int_en = ioc_bit;
179 
180 		dmac_int_en &= ioc_bit;
181 		dmac_int_sts &= dmac_int_en;
182 		if (dmac_int_sts & ioc_bit) {
183 			napi_schedule(&tx->napi);
184 			enable_flag = false;/* poll func will enable later */
185 		}
186 	}
187 
188 	if (enable_flag)
189 		/* enable isr */
190 		lan743x_csr_write(adapter, INT_EN_SET,
191 				  INT_BIT_DMA_TX_(tx->channel_number));
192 }
193 
194 static void lan743x_rx_isr(void *context, u32 int_sts, u32 flags)
195 {
196 	struct lan743x_rx *rx = context;
197 	struct lan743x_adapter *adapter = rx->adapter;
198 	bool enable_flag = true;
199 
200 	if (flags & LAN743X_VECTOR_FLAG_SOURCE_ENABLE_CLEAR) {
201 		lan743x_csr_write(adapter, INT_EN_CLR,
202 				  INT_BIT_DMA_RX_(rx->channel_number));
203 	}
204 
205 	if (int_sts & INT_BIT_DMA_RX_(rx->channel_number)) {
206 		u32 rx_frame_bit = DMAC_INT_BIT_RXFRM_(rx->channel_number);
207 		u32 dmac_int_sts;
208 		u32 dmac_int_en;
209 
210 		if (flags & LAN743X_VECTOR_FLAG_SOURCE_STATUS_READ)
211 			dmac_int_sts = lan743x_csr_read(adapter, DMAC_INT_STS);
212 		else
213 			dmac_int_sts = rx_frame_bit;
214 		if (flags & LAN743X_VECTOR_FLAG_SOURCE_ENABLE_CHECK)
215 			dmac_int_en = lan743x_csr_read(adapter,
216 						       DMAC_INT_EN_SET);
217 		else
218 			dmac_int_en = rx_frame_bit;
219 
220 		dmac_int_en &= rx_frame_bit;
221 		dmac_int_sts &= dmac_int_en;
222 		if (dmac_int_sts & rx_frame_bit) {
223 			napi_schedule(&rx->napi);
224 			enable_flag = false;/* poll funct will enable later */
225 		}
226 	}
227 
228 	if (enable_flag) {
229 		/* enable isr */
230 		lan743x_csr_write(adapter, INT_EN_SET,
231 				  INT_BIT_DMA_RX_(rx->channel_number));
232 	}
233 }
234 
235 static void lan743x_intr_shared_isr(void *context, u32 int_sts, u32 flags)
236 {
237 	struct lan743x_adapter *adapter = context;
238 	unsigned int channel;
239 
240 	if (int_sts & INT_BIT_ALL_RX_) {
241 		for (channel = 0; channel < LAN743X_USED_RX_CHANNELS;
242 			channel++) {
243 			u32 int_bit = INT_BIT_DMA_RX_(channel);
244 
245 			if (int_sts & int_bit) {
246 				lan743x_rx_isr(&adapter->rx[channel],
247 					       int_bit, flags);
248 				int_sts &= ~int_bit;
249 			}
250 		}
251 	}
252 	if (int_sts & INT_BIT_ALL_TX_) {
253 		for (channel = 0; channel < LAN743X_USED_TX_CHANNELS;
254 			channel++) {
255 			u32 int_bit = INT_BIT_DMA_TX_(channel);
256 
257 			if (int_sts & int_bit) {
258 				lan743x_tx_isr(&adapter->tx[channel],
259 					       int_bit, flags);
260 				int_sts &= ~int_bit;
261 			}
262 		}
263 	}
264 	if (int_sts & INT_BIT_ALL_OTHER_) {
265 		if (int_sts & INT_BIT_SW_GP_) {
266 			lan743x_intr_software_isr(adapter);
267 			int_sts &= ~INT_BIT_SW_GP_;
268 		}
269 		if (int_sts & INT_BIT_1588_) {
270 			lan743x_ptp_isr(adapter);
271 			int_sts &= ~INT_BIT_1588_;
272 		}
273 	}
274 	if (int_sts)
275 		lan743x_csr_write(adapter, INT_EN_CLR, int_sts);
276 }
277 
278 static irqreturn_t lan743x_intr_entry_isr(int irq, void *ptr)
279 {
280 	struct lan743x_vector *vector = ptr;
281 	struct lan743x_adapter *adapter = vector->adapter;
282 	irqreturn_t result = IRQ_NONE;
283 	u32 int_enables;
284 	u32 int_sts;
285 
286 	if (vector->flags & LAN743X_VECTOR_FLAG_SOURCE_STATUS_READ) {
287 		int_sts = lan743x_csr_read(adapter, INT_STS);
288 	} else if (vector->flags &
289 		   (LAN743X_VECTOR_FLAG_SOURCE_STATUS_R2C |
290 		   LAN743X_VECTOR_FLAG_SOURCE_ENABLE_R2C)) {
291 		int_sts = lan743x_csr_read(adapter, INT_STS_R2C);
292 	} else {
293 		/* use mask as implied status */
294 		int_sts = vector->int_mask | INT_BIT_MAS_;
295 	}
296 
297 	if (!(int_sts & INT_BIT_MAS_))
298 		goto irq_done;
299 
300 	if (vector->flags & LAN743X_VECTOR_FLAG_VECTOR_ENABLE_ISR_CLEAR)
301 		/* disable vector interrupt */
302 		lan743x_csr_write(adapter,
303 				  INT_VEC_EN_CLR,
304 				  INT_VEC_EN_(vector->vector_index));
305 
306 	if (vector->flags & LAN743X_VECTOR_FLAG_MASTER_ENABLE_CLEAR)
307 		/* disable master interrupt */
308 		lan743x_csr_write(adapter, INT_EN_CLR, INT_BIT_MAS_);
309 
310 	if (vector->flags & LAN743X_VECTOR_FLAG_SOURCE_ENABLE_CHECK) {
311 		int_enables = lan743x_csr_read(adapter, INT_EN_SET);
312 	} else {
313 		/*  use vector mask as implied enable mask */
314 		int_enables = vector->int_mask;
315 	}
316 
317 	int_sts &= int_enables;
318 	int_sts &= vector->int_mask;
319 	if (int_sts) {
320 		if (vector->handler) {
321 			vector->handler(vector->context,
322 					int_sts, vector->flags);
323 		} else {
324 			/* disable interrupts on this vector */
325 			lan743x_csr_write(adapter, INT_EN_CLR,
326 					  vector->int_mask);
327 		}
328 		result = IRQ_HANDLED;
329 	}
330 
331 	if (vector->flags & LAN743X_VECTOR_FLAG_MASTER_ENABLE_SET)
332 		/* enable master interrupt */
333 		lan743x_csr_write(adapter, INT_EN_SET, INT_BIT_MAS_);
334 
335 	if (vector->flags & LAN743X_VECTOR_FLAG_VECTOR_ENABLE_ISR_SET)
336 		/* enable vector interrupt */
337 		lan743x_csr_write(adapter,
338 				  INT_VEC_EN_SET,
339 				  INT_VEC_EN_(vector->vector_index));
340 irq_done:
341 	return result;
342 }
343 
344 static int lan743x_intr_test_isr(struct lan743x_adapter *adapter)
345 {
346 	struct lan743x_intr *intr = &adapter->intr;
347 	int ret;
348 
349 	intr->software_isr_flag = false;
350 
351 	/* enable and activate test interrupt */
352 	lan743x_csr_write(adapter, INT_EN_SET, INT_BIT_SW_GP_);
353 	lan743x_csr_write(adapter, INT_SET, INT_BIT_SW_GP_);
354 
355 	ret = wait_event_timeout(intr->software_isr_wq,
356 				 intr->software_isr_flag,
357 				 msecs_to_jiffies(200));
358 
359 	/* disable test interrupt */
360 	lan743x_csr_write(adapter, INT_EN_CLR, INT_BIT_SW_GP_);
361 
362 	return ret > 0 ? 0 : -ENODEV;
363 }
364 
365 static int lan743x_intr_register_isr(struct lan743x_adapter *adapter,
366 				     int vector_index, u32 flags,
367 				     u32 int_mask,
368 				     lan743x_vector_handler handler,
369 				     void *context)
370 {
371 	struct lan743x_vector *vector = &adapter->intr.vector_list
372 					[vector_index];
373 	int ret;
374 
375 	vector->adapter = adapter;
376 	vector->flags = flags;
377 	vector->vector_index = vector_index;
378 	vector->int_mask = int_mask;
379 	vector->handler = handler;
380 	vector->context = context;
381 
382 	ret = request_irq(vector->irq,
383 			  lan743x_intr_entry_isr,
384 			  (flags & LAN743X_VECTOR_FLAG_IRQ_SHARED) ?
385 			  IRQF_SHARED : 0, DRIVER_NAME, vector);
386 	if (ret) {
387 		vector->handler = NULL;
388 		vector->context = NULL;
389 		vector->int_mask = 0;
390 		vector->flags = 0;
391 	}
392 	return ret;
393 }
394 
395 static void lan743x_intr_unregister_isr(struct lan743x_adapter *adapter,
396 					int vector_index)
397 {
398 	struct lan743x_vector *vector = &adapter->intr.vector_list
399 					[vector_index];
400 
401 	free_irq(vector->irq, vector);
402 	vector->handler = NULL;
403 	vector->context = NULL;
404 	vector->int_mask = 0;
405 	vector->flags = 0;
406 }
407 
408 static u32 lan743x_intr_get_vector_flags(struct lan743x_adapter *adapter,
409 					 u32 int_mask)
410 {
411 	int index;
412 
413 	for (index = 0; index < LAN743X_MAX_VECTOR_COUNT; index++) {
414 		if (adapter->intr.vector_list[index].int_mask & int_mask)
415 			return adapter->intr.vector_list[index].flags;
416 	}
417 	return 0;
418 }
419 
420 static void lan743x_intr_close(struct lan743x_adapter *adapter)
421 {
422 	struct lan743x_intr *intr = &adapter->intr;
423 	int index = 0;
424 
425 	lan743x_csr_write(adapter, INT_EN_CLR, INT_BIT_MAS_);
426 	lan743x_csr_write(adapter, INT_VEC_EN_CLR, 0x000000FF);
427 
428 	for (index = 0; index < LAN743X_MAX_VECTOR_COUNT; index++) {
429 		if (intr->flags & INTR_FLAG_IRQ_REQUESTED(index)) {
430 			lan743x_intr_unregister_isr(adapter, index);
431 			intr->flags &= ~INTR_FLAG_IRQ_REQUESTED(index);
432 		}
433 	}
434 
435 	if (intr->flags & INTR_FLAG_MSI_ENABLED) {
436 		pci_disable_msi(adapter->pdev);
437 		intr->flags &= ~INTR_FLAG_MSI_ENABLED;
438 	}
439 
440 	if (intr->flags & INTR_FLAG_MSIX_ENABLED) {
441 		pci_disable_msix(adapter->pdev);
442 		intr->flags &= ~INTR_FLAG_MSIX_ENABLED;
443 	}
444 }
445 
446 static int lan743x_intr_open(struct lan743x_adapter *adapter)
447 {
448 	struct msix_entry msix_entries[LAN743X_MAX_VECTOR_COUNT];
449 	struct lan743x_intr *intr = &adapter->intr;
450 	u32 int_vec_en_auto_clr = 0;
451 	u32 int_vec_map0 = 0;
452 	u32 int_vec_map1 = 0;
453 	int ret = -ENODEV;
454 	int index = 0;
455 	u32 flags = 0;
456 
457 	intr->number_of_vectors = 0;
458 
459 	/* Try to set up MSIX interrupts */
460 	memset(&msix_entries[0], 0,
461 	       sizeof(struct msix_entry) * LAN743X_MAX_VECTOR_COUNT);
462 	for (index = 0; index < LAN743X_MAX_VECTOR_COUNT; index++)
463 		msix_entries[index].entry = index;
464 	ret = pci_enable_msix_range(adapter->pdev,
465 				    msix_entries, 1,
466 				    1 + LAN743X_USED_TX_CHANNELS +
467 				    LAN743X_USED_RX_CHANNELS);
468 
469 	if (ret > 0) {
470 		intr->flags |= INTR_FLAG_MSIX_ENABLED;
471 		intr->number_of_vectors = ret;
472 		intr->using_vectors = true;
473 		for (index = 0; index < intr->number_of_vectors; index++)
474 			intr->vector_list[index].irq = msix_entries
475 						       [index].vector;
476 		netif_info(adapter, ifup, adapter->netdev,
477 			   "using MSIX interrupts, number of vectors = %d\n",
478 			   intr->number_of_vectors);
479 	}
480 
481 	/* If MSIX failed try to setup using MSI interrupts */
482 	if (!intr->number_of_vectors) {
483 		if (!(adapter->csr.flags & LAN743X_CSR_FLAG_IS_A0)) {
484 			if (!pci_enable_msi(adapter->pdev)) {
485 				intr->flags |= INTR_FLAG_MSI_ENABLED;
486 				intr->number_of_vectors = 1;
487 				intr->using_vectors = true;
488 				intr->vector_list[0].irq =
489 					adapter->pdev->irq;
490 				netif_info(adapter, ifup, adapter->netdev,
491 					   "using MSI interrupts, number of vectors = %d\n",
492 					   intr->number_of_vectors);
493 			}
494 		}
495 	}
496 
497 	/* If MSIX, and MSI failed, setup using legacy interrupt */
498 	if (!intr->number_of_vectors) {
499 		intr->number_of_vectors = 1;
500 		intr->using_vectors = false;
501 		intr->vector_list[0].irq = intr->irq;
502 		netif_info(adapter, ifup, adapter->netdev,
503 			   "using legacy interrupts\n");
504 	}
505 
506 	/* At this point we must have at least one irq */
507 	lan743x_csr_write(adapter, INT_VEC_EN_CLR, 0xFFFFFFFF);
508 
509 	/* map all interrupts to vector 0 */
510 	lan743x_csr_write(adapter, INT_VEC_MAP0, 0x00000000);
511 	lan743x_csr_write(adapter, INT_VEC_MAP1, 0x00000000);
512 	lan743x_csr_write(adapter, INT_VEC_MAP2, 0x00000000);
513 	flags = LAN743X_VECTOR_FLAG_SOURCE_STATUS_READ |
514 		LAN743X_VECTOR_FLAG_SOURCE_STATUS_W2C |
515 		LAN743X_VECTOR_FLAG_SOURCE_ENABLE_CHECK |
516 		LAN743X_VECTOR_FLAG_SOURCE_ENABLE_CLEAR;
517 
518 	if (intr->using_vectors) {
519 		flags |= LAN743X_VECTOR_FLAG_VECTOR_ENABLE_ISR_CLEAR |
520 			 LAN743X_VECTOR_FLAG_VECTOR_ENABLE_ISR_SET;
521 	} else {
522 		flags |= LAN743X_VECTOR_FLAG_MASTER_ENABLE_CLEAR |
523 			 LAN743X_VECTOR_FLAG_MASTER_ENABLE_SET |
524 			 LAN743X_VECTOR_FLAG_IRQ_SHARED;
525 	}
526 
527 	if (adapter->csr.flags & LAN743X_CSR_FLAG_SUPPORTS_INTR_AUTO_SET_CLR) {
528 		flags &= ~LAN743X_VECTOR_FLAG_SOURCE_STATUS_READ;
529 		flags &= ~LAN743X_VECTOR_FLAG_SOURCE_STATUS_W2C;
530 		flags &= ~LAN743X_VECTOR_FLAG_SOURCE_ENABLE_CLEAR;
531 		flags &= ~LAN743X_VECTOR_FLAG_SOURCE_ENABLE_CHECK;
532 		flags |= LAN743X_VECTOR_FLAG_SOURCE_STATUS_R2C;
533 		flags |= LAN743X_VECTOR_FLAG_SOURCE_ENABLE_R2C;
534 	}
535 
536 	init_waitqueue_head(&intr->software_isr_wq);
537 
538 	ret = lan743x_intr_register_isr(adapter, 0, flags,
539 					INT_BIT_ALL_RX_ | INT_BIT_ALL_TX_ |
540 					INT_BIT_ALL_OTHER_,
541 					lan743x_intr_shared_isr, adapter);
542 	if (ret)
543 		goto clean_up;
544 	intr->flags |= INTR_FLAG_IRQ_REQUESTED(0);
545 
546 	if (intr->using_vectors)
547 		lan743x_csr_write(adapter, INT_VEC_EN_SET,
548 				  INT_VEC_EN_(0));
549 
550 	if (!(adapter->csr.flags & LAN743X_CSR_FLAG_IS_A0)) {
551 		lan743x_csr_write(adapter, INT_MOD_CFG0, LAN743X_INT_MOD);
552 		lan743x_csr_write(adapter, INT_MOD_CFG1, LAN743X_INT_MOD);
553 		lan743x_csr_write(adapter, INT_MOD_CFG2, LAN743X_INT_MOD);
554 		lan743x_csr_write(adapter, INT_MOD_CFG3, LAN743X_INT_MOD);
555 		lan743x_csr_write(adapter, INT_MOD_CFG4, LAN743X_INT_MOD);
556 		lan743x_csr_write(adapter, INT_MOD_CFG5, LAN743X_INT_MOD);
557 		lan743x_csr_write(adapter, INT_MOD_CFG6, LAN743X_INT_MOD);
558 		lan743x_csr_write(adapter, INT_MOD_CFG7, LAN743X_INT_MOD);
559 		lan743x_csr_write(adapter, INT_MOD_MAP0, 0x00005432);
560 		lan743x_csr_write(adapter, INT_MOD_MAP1, 0x00000001);
561 		lan743x_csr_write(adapter, INT_MOD_MAP2, 0x00FFFFFF);
562 	}
563 
564 	/* enable interrupts */
565 	lan743x_csr_write(adapter, INT_EN_SET, INT_BIT_MAS_);
566 	ret = lan743x_intr_test_isr(adapter);
567 	if (ret)
568 		goto clean_up;
569 
570 	if (intr->number_of_vectors > 1) {
571 		int number_of_tx_vectors = intr->number_of_vectors - 1;
572 
573 		if (number_of_tx_vectors > LAN743X_USED_TX_CHANNELS)
574 			number_of_tx_vectors = LAN743X_USED_TX_CHANNELS;
575 		flags = LAN743X_VECTOR_FLAG_SOURCE_STATUS_READ |
576 			LAN743X_VECTOR_FLAG_SOURCE_STATUS_W2C |
577 			LAN743X_VECTOR_FLAG_SOURCE_ENABLE_CHECK |
578 			LAN743X_VECTOR_FLAG_SOURCE_ENABLE_CLEAR |
579 			LAN743X_VECTOR_FLAG_VECTOR_ENABLE_ISR_CLEAR |
580 			LAN743X_VECTOR_FLAG_VECTOR_ENABLE_ISR_SET;
581 
582 		if (adapter->csr.flags &
583 		   LAN743X_CSR_FLAG_SUPPORTS_INTR_AUTO_SET_CLR) {
584 			flags = LAN743X_VECTOR_FLAG_VECTOR_ENABLE_AUTO_SET |
585 				LAN743X_VECTOR_FLAG_SOURCE_ENABLE_AUTO_SET |
586 				LAN743X_VECTOR_FLAG_SOURCE_ENABLE_AUTO_CLEAR |
587 				LAN743X_VECTOR_FLAG_SOURCE_STATUS_AUTO_CLEAR;
588 		}
589 
590 		for (index = 0; index < number_of_tx_vectors; index++) {
591 			u32 int_bit = INT_BIT_DMA_TX_(index);
592 			int vector = index + 1;
593 
594 			/* map TX interrupt to vector */
595 			int_vec_map1 |= INT_VEC_MAP1_TX_VEC_(index, vector);
596 			lan743x_csr_write(adapter, INT_VEC_MAP1, int_vec_map1);
597 
598 			/* Remove TX interrupt from shared mask */
599 			intr->vector_list[0].int_mask &= ~int_bit;
600 			ret = lan743x_intr_register_isr(adapter, vector, flags,
601 							int_bit, lan743x_tx_isr,
602 							&adapter->tx[index]);
603 			if (ret)
604 				goto clean_up;
605 			intr->flags |= INTR_FLAG_IRQ_REQUESTED(vector);
606 			if (!(flags &
607 			    LAN743X_VECTOR_FLAG_VECTOR_ENABLE_AUTO_SET))
608 				lan743x_csr_write(adapter, INT_VEC_EN_SET,
609 						  INT_VEC_EN_(vector));
610 		}
611 	}
612 	if ((intr->number_of_vectors - LAN743X_USED_TX_CHANNELS) > 1) {
613 		int number_of_rx_vectors = intr->number_of_vectors -
614 					   LAN743X_USED_TX_CHANNELS - 1;
615 
616 		if (number_of_rx_vectors > LAN743X_USED_RX_CHANNELS)
617 			number_of_rx_vectors = LAN743X_USED_RX_CHANNELS;
618 
619 		flags = LAN743X_VECTOR_FLAG_SOURCE_STATUS_READ |
620 			LAN743X_VECTOR_FLAG_SOURCE_STATUS_W2C |
621 			LAN743X_VECTOR_FLAG_SOURCE_ENABLE_CHECK |
622 			LAN743X_VECTOR_FLAG_SOURCE_ENABLE_CLEAR |
623 			LAN743X_VECTOR_FLAG_VECTOR_ENABLE_ISR_CLEAR |
624 			LAN743X_VECTOR_FLAG_VECTOR_ENABLE_ISR_SET;
625 
626 		if (adapter->csr.flags &
627 		    LAN743X_CSR_FLAG_SUPPORTS_INTR_AUTO_SET_CLR) {
628 			flags = LAN743X_VECTOR_FLAG_VECTOR_ENABLE_AUTO_CLEAR |
629 				LAN743X_VECTOR_FLAG_VECTOR_ENABLE_AUTO_SET |
630 				LAN743X_VECTOR_FLAG_SOURCE_ENABLE_AUTO_SET |
631 				LAN743X_VECTOR_FLAG_SOURCE_ENABLE_AUTO_CLEAR |
632 				LAN743X_VECTOR_FLAG_SOURCE_STATUS_AUTO_CLEAR;
633 		}
634 		for (index = 0; index < number_of_rx_vectors; index++) {
635 			int vector = index + 1 + LAN743X_USED_TX_CHANNELS;
636 			u32 int_bit = INT_BIT_DMA_RX_(index);
637 
638 			/* map RX interrupt to vector */
639 			int_vec_map0 |= INT_VEC_MAP0_RX_VEC_(index, vector);
640 			lan743x_csr_write(adapter, INT_VEC_MAP0, int_vec_map0);
641 			if (flags &
642 			    LAN743X_VECTOR_FLAG_VECTOR_ENABLE_AUTO_CLEAR) {
643 				int_vec_en_auto_clr |= INT_VEC_EN_(vector);
644 				lan743x_csr_write(adapter, INT_VEC_EN_AUTO_CLR,
645 						  int_vec_en_auto_clr);
646 			}
647 
648 			/* Remove RX interrupt from shared mask */
649 			intr->vector_list[0].int_mask &= ~int_bit;
650 			ret = lan743x_intr_register_isr(adapter, vector, flags,
651 							int_bit, lan743x_rx_isr,
652 							&adapter->rx[index]);
653 			if (ret)
654 				goto clean_up;
655 			intr->flags |= INTR_FLAG_IRQ_REQUESTED(vector);
656 
657 			lan743x_csr_write(adapter, INT_VEC_EN_SET,
658 					  INT_VEC_EN_(vector));
659 		}
660 	}
661 	return 0;
662 
663 clean_up:
664 	lan743x_intr_close(adapter);
665 	return ret;
666 }
667 
668 static int lan743x_dp_write(struct lan743x_adapter *adapter,
669 			    u32 select, u32 addr, u32 length, u32 *buf)
670 {
671 	u32 dp_sel;
672 	int i;
673 
674 	if (lan743x_csr_wait_for_bit(adapter, DP_SEL, DP_SEL_DPRDY_,
675 				     1, 40, 100, 100))
676 		return -EIO;
677 	dp_sel = lan743x_csr_read(adapter, DP_SEL);
678 	dp_sel &= ~DP_SEL_MASK_;
679 	dp_sel |= select;
680 	lan743x_csr_write(adapter, DP_SEL, dp_sel);
681 
682 	for (i = 0; i < length; i++) {
683 		lan743x_csr_write(adapter, DP_ADDR, addr + i);
684 		lan743x_csr_write(adapter, DP_DATA_0, buf[i]);
685 		lan743x_csr_write(adapter, DP_CMD, DP_CMD_WRITE_);
686 		if (lan743x_csr_wait_for_bit(adapter, DP_SEL, DP_SEL_DPRDY_,
687 					     1, 40, 100, 100))
688 			return -EIO;
689 	}
690 
691 	return 0;
692 }
693 
694 static u32 lan743x_mac_mii_access(u16 id, u16 index, int read)
695 {
696 	u32 ret;
697 
698 	ret = (id << MAC_MII_ACC_PHY_ADDR_SHIFT_) &
699 		MAC_MII_ACC_PHY_ADDR_MASK_;
700 	ret |= (index << MAC_MII_ACC_MIIRINDA_SHIFT_) &
701 		MAC_MII_ACC_MIIRINDA_MASK_;
702 
703 	if (read)
704 		ret |= MAC_MII_ACC_MII_READ_;
705 	else
706 		ret |= MAC_MII_ACC_MII_WRITE_;
707 	ret |= MAC_MII_ACC_MII_BUSY_;
708 
709 	return ret;
710 }
711 
712 static int lan743x_mac_mii_wait_till_not_busy(struct lan743x_adapter *adapter)
713 {
714 	u32 data;
715 
716 	return readx_poll_timeout(LAN743X_CSR_READ_OP, MAC_MII_ACC, data,
717 				  !(data & MAC_MII_ACC_MII_BUSY_), 0, 1000000);
718 }
719 
720 static int lan743x_mdiobus_read(struct mii_bus *bus, int phy_id, int index)
721 {
722 	struct lan743x_adapter *adapter = bus->priv;
723 	u32 val, mii_access;
724 	int ret;
725 
726 	/* comfirm MII not busy */
727 	ret = lan743x_mac_mii_wait_till_not_busy(adapter);
728 	if (ret < 0)
729 		return ret;
730 
731 	/* set the address, index & direction (read from PHY) */
732 	mii_access = lan743x_mac_mii_access(phy_id, index, MAC_MII_READ);
733 	lan743x_csr_write(adapter, MAC_MII_ACC, mii_access);
734 	ret = lan743x_mac_mii_wait_till_not_busy(adapter);
735 	if (ret < 0)
736 		return ret;
737 
738 	val = lan743x_csr_read(adapter, MAC_MII_DATA);
739 	return (int)(val & 0xFFFF);
740 }
741 
742 static int lan743x_mdiobus_write(struct mii_bus *bus,
743 				 int phy_id, int index, u16 regval)
744 {
745 	struct lan743x_adapter *adapter = bus->priv;
746 	u32 val, mii_access;
747 	int ret;
748 
749 	/* confirm MII not busy */
750 	ret = lan743x_mac_mii_wait_till_not_busy(adapter);
751 	if (ret < 0)
752 		return ret;
753 	val = (u32)regval;
754 	lan743x_csr_write(adapter, MAC_MII_DATA, val);
755 
756 	/* set the address, index & direction (write to PHY) */
757 	mii_access = lan743x_mac_mii_access(phy_id, index, MAC_MII_WRITE);
758 	lan743x_csr_write(adapter, MAC_MII_ACC, mii_access);
759 	ret = lan743x_mac_mii_wait_till_not_busy(adapter);
760 	return ret;
761 }
762 
763 static void lan743x_mac_set_address(struct lan743x_adapter *adapter,
764 				    u8 *addr)
765 {
766 	u32 addr_lo, addr_hi;
767 
768 	addr_lo = addr[0] |
769 		addr[1] << 8 |
770 		addr[2] << 16 |
771 		addr[3] << 24;
772 	addr_hi = addr[4] |
773 		addr[5] << 8;
774 	lan743x_csr_write(adapter, MAC_RX_ADDRL, addr_lo);
775 	lan743x_csr_write(adapter, MAC_RX_ADDRH, addr_hi);
776 
777 	ether_addr_copy(adapter->mac_address, addr);
778 	netif_info(adapter, drv, adapter->netdev,
779 		   "MAC address set to %pM\n", addr);
780 }
781 
782 static int lan743x_mac_init(struct lan743x_adapter *adapter)
783 {
784 	bool mac_address_valid = true;
785 	struct net_device *netdev;
786 	u32 mac_addr_hi = 0;
787 	u32 mac_addr_lo = 0;
788 	u32 data;
789 
790 	netdev = adapter->netdev;
791 
792 	/* disable auto duplex, and speed detection. Phylib does that */
793 	data = lan743x_csr_read(adapter, MAC_CR);
794 	data &= ~(MAC_CR_ADD_ | MAC_CR_ASD_);
795 	data |= MAC_CR_CNTR_RST_;
796 	lan743x_csr_write(adapter, MAC_CR, data);
797 
798 	if (!is_valid_ether_addr(adapter->mac_address)) {
799 		mac_addr_hi = lan743x_csr_read(adapter, MAC_RX_ADDRH);
800 		mac_addr_lo = lan743x_csr_read(adapter, MAC_RX_ADDRL);
801 		adapter->mac_address[0] = mac_addr_lo & 0xFF;
802 		adapter->mac_address[1] = (mac_addr_lo >> 8) & 0xFF;
803 		adapter->mac_address[2] = (mac_addr_lo >> 16) & 0xFF;
804 		adapter->mac_address[3] = (mac_addr_lo >> 24) & 0xFF;
805 		adapter->mac_address[4] = mac_addr_hi & 0xFF;
806 		adapter->mac_address[5] = (mac_addr_hi >> 8) & 0xFF;
807 
808 		if (((mac_addr_hi & 0x0000FFFF) == 0x0000FFFF) &&
809 		    mac_addr_lo == 0xFFFFFFFF) {
810 			mac_address_valid = false;
811 		} else if (!is_valid_ether_addr(adapter->mac_address)) {
812 			mac_address_valid = false;
813 		}
814 
815 		if (!mac_address_valid)
816 			eth_random_addr(adapter->mac_address);
817 	}
818 	lan743x_mac_set_address(adapter, adapter->mac_address);
819 	ether_addr_copy(netdev->dev_addr, adapter->mac_address);
820 
821 	return 0;
822 }
823 
824 static int lan743x_mac_open(struct lan743x_adapter *adapter)
825 {
826 	u32 temp;
827 
828 	temp = lan743x_csr_read(adapter, MAC_RX);
829 	lan743x_csr_write(adapter, MAC_RX, temp | MAC_RX_RXEN_);
830 	temp = lan743x_csr_read(adapter, MAC_TX);
831 	lan743x_csr_write(adapter, MAC_TX, temp | MAC_TX_TXEN_);
832 	return 0;
833 }
834 
835 static void lan743x_mac_close(struct lan743x_adapter *adapter)
836 {
837 	u32 temp;
838 
839 	temp = lan743x_csr_read(adapter, MAC_TX);
840 	temp &= ~MAC_TX_TXEN_;
841 	lan743x_csr_write(adapter, MAC_TX, temp);
842 	lan743x_csr_wait_for_bit(adapter, MAC_TX, MAC_TX_TXD_,
843 				 1, 1000, 20000, 100);
844 
845 	temp = lan743x_csr_read(adapter, MAC_RX);
846 	temp &= ~MAC_RX_RXEN_;
847 	lan743x_csr_write(adapter, MAC_RX, temp);
848 	lan743x_csr_wait_for_bit(adapter, MAC_RX, MAC_RX_RXD_,
849 				 1, 1000, 20000, 100);
850 }
851 
852 static void lan743x_mac_flow_ctrl_set_enables(struct lan743x_adapter *adapter,
853 					      bool tx_enable, bool rx_enable)
854 {
855 	u32 flow_setting = 0;
856 
857 	/* set maximum pause time because when fifo space frees
858 	 * up a zero value pause frame will be sent to release the pause
859 	 */
860 	flow_setting = MAC_FLOW_CR_FCPT_MASK_;
861 	if (tx_enable)
862 		flow_setting |= MAC_FLOW_CR_TX_FCEN_;
863 	if (rx_enable)
864 		flow_setting |= MAC_FLOW_CR_RX_FCEN_;
865 	lan743x_csr_write(adapter, MAC_FLOW, flow_setting);
866 }
867 
868 static int lan743x_mac_set_mtu(struct lan743x_adapter *adapter, int new_mtu)
869 {
870 	int enabled = 0;
871 	u32 mac_rx = 0;
872 
873 	mac_rx = lan743x_csr_read(adapter, MAC_RX);
874 	if (mac_rx & MAC_RX_RXEN_) {
875 		enabled = 1;
876 		if (mac_rx & MAC_RX_RXD_) {
877 			lan743x_csr_write(adapter, MAC_RX, mac_rx);
878 			mac_rx &= ~MAC_RX_RXD_;
879 		}
880 		mac_rx &= ~MAC_RX_RXEN_;
881 		lan743x_csr_write(adapter, MAC_RX, mac_rx);
882 		lan743x_csr_wait_for_bit(adapter, MAC_RX, MAC_RX_RXD_,
883 					 1, 1000, 20000, 100);
884 		lan743x_csr_write(adapter, MAC_RX, mac_rx | MAC_RX_RXD_);
885 	}
886 
887 	mac_rx &= ~(MAC_RX_MAX_SIZE_MASK_);
888 	mac_rx |= (((new_mtu + ETH_HLEN + ETH_FCS_LEN)
889 		  << MAC_RX_MAX_SIZE_SHIFT_) & MAC_RX_MAX_SIZE_MASK_);
890 	lan743x_csr_write(adapter, MAC_RX, mac_rx);
891 
892 	if (enabled) {
893 		mac_rx |= MAC_RX_RXEN_;
894 		lan743x_csr_write(adapter, MAC_RX, mac_rx);
895 	}
896 	return 0;
897 }
898 
899 /* PHY */
900 static int lan743x_phy_reset(struct lan743x_adapter *adapter)
901 {
902 	u32 data;
903 
904 	/* Only called with in probe, and before mdiobus_register */
905 
906 	data = lan743x_csr_read(adapter, PMT_CTL);
907 	data |= PMT_CTL_ETH_PHY_RST_;
908 	lan743x_csr_write(adapter, PMT_CTL, data);
909 
910 	return readx_poll_timeout(LAN743X_CSR_READ_OP, PMT_CTL, data,
911 				  (!(data & PMT_CTL_ETH_PHY_RST_) &&
912 				  (data & PMT_CTL_READY_)),
913 				  50000, 1000000);
914 }
915 
916 static void lan743x_phy_update_flowcontrol(struct lan743x_adapter *adapter,
917 					   u8 duplex, u16 local_adv,
918 					   u16 remote_adv)
919 {
920 	struct lan743x_phy *phy = &adapter->phy;
921 	u8 cap;
922 
923 	if (phy->fc_autoneg)
924 		cap = mii_resolve_flowctrl_fdx(local_adv, remote_adv);
925 	else
926 		cap = phy->fc_request_control;
927 
928 	lan743x_mac_flow_ctrl_set_enables(adapter,
929 					  cap & FLOW_CTRL_TX,
930 					  cap & FLOW_CTRL_RX);
931 }
932 
933 static int lan743x_phy_init(struct lan743x_adapter *adapter)
934 {
935 	return lan743x_phy_reset(adapter);
936 }
937 
938 static void lan743x_phy_link_status_change(struct net_device *netdev)
939 {
940 	struct lan743x_adapter *adapter = netdev_priv(netdev);
941 	struct phy_device *phydev = netdev->phydev;
942 	u32 data;
943 
944 	phy_print_status(phydev);
945 	if (phydev->state == PHY_RUNNING) {
946 		struct ethtool_link_ksettings ksettings;
947 		int remote_advertisement = 0;
948 		int local_advertisement = 0;
949 
950 		data = lan743x_csr_read(adapter, MAC_CR);
951 
952 		/* set interface mode */
953 		if (phy_interface_is_rgmii(phydev))
954 			/* RGMII */
955 			data &= ~MAC_CR_MII_EN_;
956 		else
957 			/* GMII */
958 			data |= MAC_CR_MII_EN_;
959 
960 		/* set duplex mode */
961 		if (phydev->duplex)
962 			data |= MAC_CR_DPX_;
963 		else
964 			data &= ~MAC_CR_DPX_;
965 
966 		/* set bus speed */
967 		switch (phydev->speed) {
968 		case SPEED_10:
969 			data &= ~MAC_CR_CFG_H_;
970 			data &= ~MAC_CR_CFG_L_;
971 		break;
972 		case SPEED_100:
973 			data &= ~MAC_CR_CFG_H_;
974 			data |= MAC_CR_CFG_L_;
975 		break;
976 		case SPEED_1000:
977 			data |= MAC_CR_CFG_H_;
978 			data &= ~MAC_CR_CFG_L_;
979 		break;
980 		}
981 		lan743x_csr_write(adapter, MAC_CR, data);
982 
983 		memset(&ksettings, 0, sizeof(ksettings));
984 		phy_ethtool_get_link_ksettings(netdev, &ksettings);
985 		local_advertisement =
986 			linkmode_adv_to_mii_adv_t(phydev->advertising);
987 		remote_advertisement =
988 			linkmode_adv_to_mii_adv_t(phydev->lp_advertising);
989 
990 		lan743x_phy_update_flowcontrol(adapter,
991 					       ksettings.base.duplex,
992 					       local_advertisement,
993 					       remote_advertisement);
994 		lan743x_ptp_update_latency(adapter, ksettings.base.speed);
995 	}
996 }
997 
998 static void lan743x_phy_close(struct lan743x_adapter *adapter)
999 {
1000 	struct net_device *netdev = adapter->netdev;
1001 
1002 	phy_stop(netdev->phydev);
1003 	phy_disconnect(netdev->phydev);
1004 	netdev->phydev = NULL;
1005 }
1006 
1007 static int lan743x_phy_open(struct lan743x_adapter *adapter)
1008 {
1009 	struct net_device *netdev = adapter->netdev;
1010 	struct lan743x_phy *phy = &adapter->phy;
1011 	struct phy_device *phydev;
1012 	int ret = -EIO;
1013 
1014 	/* try devicetree phy, or fixed link */
1015 	phydev = of_phy_get_and_connect(netdev, adapter->pdev->dev.of_node,
1016 					lan743x_phy_link_status_change);
1017 
1018 	if (!phydev) {
1019 		/* try internal phy */
1020 		phydev = phy_find_first(adapter->mdiobus);
1021 		if (!phydev)
1022 			goto return_error;
1023 
1024 		ret = phy_connect_direct(netdev, phydev,
1025 					 lan743x_phy_link_status_change,
1026 					 PHY_INTERFACE_MODE_GMII);
1027 		if (ret)
1028 			goto return_error;
1029 	}
1030 
1031 	/* MAC doesn't support 1000T Half */
1032 	phy_remove_link_mode(phydev, ETHTOOL_LINK_MODE_1000baseT_Half_BIT);
1033 
1034 	/* support both flow controls */
1035 	phy_support_asym_pause(phydev);
1036 	phy->fc_request_control = (FLOW_CTRL_RX | FLOW_CTRL_TX);
1037 	phy->fc_autoneg = phydev->autoneg;
1038 
1039 	phy_start(phydev);
1040 	phy_start_aneg(phydev);
1041 	phy_attached_info(phydev);
1042 	return 0;
1043 
1044 return_error:
1045 	return ret;
1046 }
1047 
1048 static void lan743x_rfe_open(struct lan743x_adapter *adapter)
1049 {
1050 	lan743x_csr_write(adapter, RFE_RSS_CFG,
1051 		RFE_RSS_CFG_UDP_IPV6_EX_ |
1052 		RFE_RSS_CFG_TCP_IPV6_EX_ |
1053 		RFE_RSS_CFG_IPV6_EX_ |
1054 		RFE_RSS_CFG_UDP_IPV6_ |
1055 		RFE_RSS_CFG_TCP_IPV6_ |
1056 		RFE_RSS_CFG_IPV6_ |
1057 		RFE_RSS_CFG_UDP_IPV4_ |
1058 		RFE_RSS_CFG_TCP_IPV4_ |
1059 		RFE_RSS_CFG_IPV4_ |
1060 		RFE_RSS_CFG_VALID_HASH_BITS_ |
1061 		RFE_RSS_CFG_RSS_QUEUE_ENABLE_ |
1062 		RFE_RSS_CFG_RSS_HASH_STORE_ |
1063 		RFE_RSS_CFG_RSS_ENABLE_);
1064 }
1065 
1066 static void lan743x_rfe_update_mac_address(struct lan743x_adapter *adapter)
1067 {
1068 	u8 *mac_addr;
1069 	u32 mac_addr_hi = 0;
1070 	u32 mac_addr_lo = 0;
1071 
1072 	/* Add mac address to perfect Filter */
1073 	mac_addr = adapter->mac_address;
1074 	mac_addr_lo = ((((u32)(mac_addr[0])) << 0) |
1075 		      (((u32)(mac_addr[1])) << 8) |
1076 		      (((u32)(mac_addr[2])) << 16) |
1077 		      (((u32)(mac_addr[3])) << 24));
1078 	mac_addr_hi = ((((u32)(mac_addr[4])) << 0) |
1079 		      (((u32)(mac_addr[5])) << 8));
1080 
1081 	lan743x_csr_write(adapter, RFE_ADDR_FILT_LO(0), mac_addr_lo);
1082 	lan743x_csr_write(adapter, RFE_ADDR_FILT_HI(0),
1083 			  mac_addr_hi | RFE_ADDR_FILT_HI_VALID_);
1084 }
1085 
1086 static void lan743x_rfe_set_multicast(struct lan743x_adapter *adapter)
1087 {
1088 	struct net_device *netdev = adapter->netdev;
1089 	u32 hash_table[DP_SEL_VHF_HASH_LEN];
1090 	u32 rfctl;
1091 	u32 data;
1092 
1093 	rfctl = lan743x_csr_read(adapter, RFE_CTL);
1094 	rfctl &= ~(RFE_CTL_AU_ | RFE_CTL_AM_ |
1095 		 RFE_CTL_DA_PERFECT_ | RFE_CTL_MCAST_HASH_);
1096 	rfctl |= RFE_CTL_AB_;
1097 	if (netdev->flags & IFF_PROMISC) {
1098 		rfctl |= RFE_CTL_AM_ | RFE_CTL_AU_;
1099 	} else {
1100 		if (netdev->flags & IFF_ALLMULTI)
1101 			rfctl |= RFE_CTL_AM_;
1102 	}
1103 
1104 	memset(hash_table, 0, DP_SEL_VHF_HASH_LEN * sizeof(u32));
1105 	if (netdev_mc_count(netdev)) {
1106 		struct netdev_hw_addr *ha;
1107 		int i;
1108 
1109 		rfctl |= RFE_CTL_DA_PERFECT_;
1110 		i = 1;
1111 		netdev_for_each_mc_addr(ha, netdev) {
1112 			/* set first 32 into Perfect Filter */
1113 			if (i < 33) {
1114 				lan743x_csr_write(adapter,
1115 						  RFE_ADDR_FILT_HI(i), 0);
1116 				data = ha->addr[3];
1117 				data = ha->addr[2] | (data << 8);
1118 				data = ha->addr[1] | (data << 8);
1119 				data = ha->addr[0] | (data << 8);
1120 				lan743x_csr_write(adapter,
1121 						  RFE_ADDR_FILT_LO(i), data);
1122 				data = ha->addr[5];
1123 				data = ha->addr[4] | (data << 8);
1124 				data |= RFE_ADDR_FILT_HI_VALID_;
1125 				lan743x_csr_write(adapter,
1126 						  RFE_ADDR_FILT_HI(i), data);
1127 			} else {
1128 				u32 bitnum = (ether_crc(ETH_ALEN, ha->addr) >>
1129 					     23) & 0x1FF;
1130 				hash_table[bitnum / 32] |= (1 << (bitnum % 32));
1131 				rfctl |= RFE_CTL_MCAST_HASH_;
1132 			}
1133 			i++;
1134 		}
1135 	}
1136 
1137 	lan743x_dp_write(adapter, DP_SEL_RFE_RAM,
1138 			 DP_SEL_VHF_VLAN_LEN,
1139 			 DP_SEL_VHF_HASH_LEN, hash_table);
1140 	lan743x_csr_write(adapter, RFE_CTL, rfctl);
1141 }
1142 
1143 static int lan743x_dmac_init(struct lan743x_adapter *adapter)
1144 {
1145 	u32 data = 0;
1146 
1147 	lan743x_csr_write(adapter, DMAC_CMD, DMAC_CMD_SWR_);
1148 	lan743x_csr_wait_for_bit(adapter, DMAC_CMD, DMAC_CMD_SWR_,
1149 				 0, 1000, 20000, 100);
1150 	switch (DEFAULT_DMA_DESCRIPTOR_SPACING) {
1151 	case DMA_DESCRIPTOR_SPACING_16:
1152 		data = DMAC_CFG_MAX_DSPACE_16_;
1153 		break;
1154 	case DMA_DESCRIPTOR_SPACING_32:
1155 		data = DMAC_CFG_MAX_DSPACE_32_;
1156 		break;
1157 	case DMA_DESCRIPTOR_SPACING_64:
1158 		data = DMAC_CFG_MAX_DSPACE_64_;
1159 		break;
1160 	case DMA_DESCRIPTOR_SPACING_128:
1161 		data = DMAC_CFG_MAX_DSPACE_128_;
1162 		break;
1163 	default:
1164 		return -EPERM;
1165 	}
1166 	if (!(adapter->csr.flags & LAN743X_CSR_FLAG_IS_A0))
1167 		data |= DMAC_CFG_COAL_EN_;
1168 	data |= DMAC_CFG_CH_ARB_SEL_RX_HIGH_;
1169 	data |= DMAC_CFG_MAX_READ_REQ_SET_(6);
1170 	lan743x_csr_write(adapter, DMAC_CFG, data);
1171 	data = DMAC_COAL_CFG_TIMER_LIMIT_SET_(1);
1172 	data |= DMAC_COAL_CFG_TIMER_TX_START_;
1173 	data |= DMAC_COAL_CFG_FLUSH_INTS_;
1174 	data |= DMAC_COAL_CFG_INT_EXIT_COAL_;
1175 	data |= DMAC_COAL_CFG_CSR_EXIT_COAL_;
1176 	data |= DMAC_COAL_CFG_TX_THRES_SET_(0x0A);
1177 	data |= DMAC_COAL_CFG_RX_THRES_SET_(0x0C);
1178 	lan743x_csr_write(adapter, DMAC_COAL_CFG, data);
1179 	data = DMAC_OBFF_TX_THRES_SET_(0x08);
1180 	data |= DMAC_OBFF_RX_THRES_SET_(0x0A);
1181 	lan743x_csr_write(adapter, DMAC_OBFF_CFG, data);
1182 	return 0;
1183 }
1184 
1185 static int lan743x_dmac_tx_get_state(struct lan743x_adapter *adapter,
1186 				     int tx_channel)
1187 {
1188 	u32 dmac_cmd = 0;
1189 
1190 	dmac_cmd = lan743x_csr_read(adapter, DMAC_CMD);
1191 	return DMAC_CHANNEL_STATE_SET((dmac_cmd &
1192 				      DMAC_CMD_START_T_(tx_channel)),
1193 				      (dmac_cmd &
1194 				      DMAC_CMD_STOP_T_(tx_channel)));
1195 }
1196 
1197 static int lan743x_dmac_tx_wait_till_stopped(struct lan743x_adapter *adapter,
1198 					     int tx_channel)
1199 {
1200 	int timeout = 100;
1201 	int result = 0;
1202 
1203 	while (timeout &&
1204 	       ((result = lan743x_dmac_tx_get_state(adapter, tx_channel)) ==
1205 	       DMAC_CHANNEL_STATE_STOP_PENDING)) {
1206 		usleep_range(1000, 20000);
1207 		timeout--;
1208 	}
1209 	if (result == DMAC_CHANNEL_STATE_STOP_PENDING)
1210 		result = -ENODEV;
1211 	return result;
1212 }
1213 
1214 static int lan743x_dmac_rx_get_state(struct lan743x_adapter *adapter,
1215 				     int rx_channel)
1216 {
1217 	u32 dmac_cmd = 0;
1218 
1219 	dmac_cmd = lan743x_csr_read(adapter, DMAC_CMD);
1220 	return DMAC_CHANNEL_STATE_SET((dmac_cmd &
1221 				      DMAC_CMD_START_R_(rx_channel)),
1222 				      (dmac_cmd &
1223 				      DMAC_CMD_STOP_R_(rx_channel)));
1224 }
1225 
1226 static int lan743x_dmac_rx_wait_till_stopped(struct lan743x_adapter *adapter,
1227 					     int rx_channel)
1228 {
1229 	int timeout = 100;
1230 	int result = 0;
1231 
1232 	while (timeout &&
1233 	       ((result = lan743x_dmac_rx_get_state(adapter, rx_channel)) ==
1234 	       DMAC_CHANNEL_STATE_STOP_PENDING)) {
1235 		usleep_range(1000, 20000);
1236 		timeout--;
1237 	}
1238 	if (result == DMAC_CHANNEL_STATE_STOP_PENDING)
1239 		result = -ENODEV;
1240 	return result;
1241 }
1242 
1243 static void lan743x_tx_release_desc(struct lan743x_tx *tx,
1244 				    int descriptor_index, bool cleanup)
1245 {
1246 	struct lan743x_tx_buffer_info *buffer_info = NULL;
1247 	struct lan743x_tx_descriptor *descriptor = NULL;
1248 	u32 descriptor_type = 0;
1249 	bool ignore_sync;
1250 
1251 	descriptor = &tx->ring_cpu_ptr[descriptor_index];
1252 	buffer_info = &tx->buffer_info[descriptor_index];
1253 	if (!(buffer_info->flags & TX_BUFFER_INFO_FLAG_ACTIVE))
1254 		goto done;
1255 
1256 	descriptor_type = le32_to_cpu(descriptor->data0) &
1257 			  TX_DESC_DATA0_DTYPE_MASK_;
1258 	if (descriptor_type == TX_DESC_DATA0_DTYPE_DATA_)
1259 		goto clean_up_data_descriptor;
1260 	else
1261 		goto clear_active;
1262 
1263 clean_up_data_descriptor:
1264 	if (buffer_info->dma_ptr) {
1265 		if (buffer_info->flags &
1266 		    TX_BUFFER_INFO_FLAG_SKB_FRAGMENT) {
1267 			dma_unmap_page(&tx->adapter->pdev->dev,
1268 				       buffer_info->dma_ptr,
1269 				       buffer_info->buffer_length,
1270 				       DMA_TO_DEVICE);
1271 		} else {
1272 			dma_unmap_single(&tx->adapter->pdev->dev,
1273 					 buffer_info->dma_ptr,
1274 					 buffer_info->buffer_length,
1275 					 DMA_TO_DEVICE);
1276 		}
1277 		buffer_info->dma_ptr = 0;
1278 		buffer_info->buffer_length = 0;
1279 	}
1280 	if (!buffer_info->skb)
1281 		goto clear_active;
1282 
1283 	if (!(buffer_info->flags & TX_BUFFER_INFO_FLAG_TIMESTAMP_REQUESTED)) {
1284 		dev_kfree_skb_any(buffer_info->skb);
1285 		goto clear_skb;
1286 	}
1287 
1288 	if (cleanup) {
1289 		lan743x_ptp_unrequest_tx_timestamp(tx->adapter);
1290 		dev_kfree_skb_any(buffer_info->skb);
1291 	} else {
1292 		ignore_sync = (buffer_info->flags &
1293 			       TX_BUFFER_INFO_FLAG_IGNORE_SYNC) != 0;
1294 		lan743x_ptp_tx_timestamp_skb(tx->adapter,
1295 					     buffer_info->skb, ignore_sync);
1296 	}
1297 
1298 clear_skb:
1299 	buffer_info->skb = NULL;
1300 
1301 clear_active:
1302 	buffer_info->flags &= ~TX_BUFFER_INFO_FLAG_ACTIVE;
1303 
1304 done:
1305 	memset(buffer_info, 0, sizeof(*buffer_info));
1306 	memset(descriptor, 0, sizeof(*descriptor));
1307 }
1308 
1309 static int lan743x_tx_next_index(struct lan743x_tx *tx, int index)
1310 {
1311 	return ((++index) % tx->ring_size);
1312 }
1313 
1314 static void lan743x_tx_release_completed_descriptors(struct lan743x_tx *tx)
1315 {
1316 	while (le32_to_cpu(*tx->head_cpu_ptr) != (tx->last_head)) {
1317 		lan743x_tx_release_desc(tx, tx->last_head, false);
1318 		tx->last_head = lan743x_tx_next_index(tx, tx->last_head);
1319 	}
1320 }
1321 
1322 static void lan743x_tx_release_all_descriptors(struct lan743x_tx *tx)
1323 {
1324 	u32 original_head = 0;
1325 
1326 	original_head = tx->last_head;
1327 	do {
1328 		lan743x_tx_release_desc(tx, tx->last_head, true);
1329 		tx->last_head = lan743x_tx_next_index(tx, tx->last_head);
1330 	} while (tx->last_head != original_head);
1331 	memset(tx->ring_cpu_ptr, 0,
1332 	       sizeof(*tx->ring_cpu_ptr) * (tx->ring_size));
1333 	memset(tx->buffer_info, 0,
1334 	       sizeof(*tx->buffer_info) * (tx->ring_size));
1335 }
1336 
1337 static int lan743x_tx_get_desc_cnt(struct lan743x_tx *tx,
1338 				   struct sk_buff *skb)
1339 {
1340 	int result = 1; /* 1 for the main skb buffer */
1341 	int nr_frags = 0;
1342 
1343 	if (skb_is_gso(skb))
1344 		result++; /* requires an extension descriptor */
1345 	nr_frags = skb_shinfo(skb)->nr_frags;
1346 	result += nr_frags; /* 1 for each fragment buffer */
1347 	return result;
1348 }
1349 
1350 static int lan743x_tx_get_avail_desc(struct lan743x_tx *tx)
1351 {
1352 	int last_head = tx->last_head;
1353 	int last_tail = tx->last_tail;
1354 
1355 	if (last_tail >= last_head)
1356 		return tx->ring_size - last_tail + last_head - 1;
1357 	else
1358 		return last_head - last_tail - 1;
1359 }
1360 
1361 void lan743x_tx_set_timestamping_mode(struct lan743x_tx *tx,
1362 				      bool enable_timestamping,
1363 				      bool enable_onestep_sync)
1364 {
1365 	if (enable_timestamping)
1366 		tx->ts_flags |= TX_TS_FLAG_TIMESTAMPING_ENABLED;
1367 	else
1368 		tx->ts_flags &= ~TX_TS_FLAG_TIMESTAMPING_ENABLED;
1369 	if (enable_onestep_sync)
1370 		tx->ts_flags |= TX_TS_FLAG_ONE_STEP_SYNC;
1371 	else
1372 		tx->ts_flags &= ~TX_TS_FLAG_ONE_STEP_SYNC;
1373 }
1374 
1375 static int lan743x_tx_frame_start(struct lan743x_tx *tx,
1376 				  unsigned char *first_buffer,
1377 				  unsigned int first_buffer_length,
1378 				  unsigned int frame_length,
1379 				  bool time_stamp,
1380 				  bool check_sum)
1381 {
1382 	/* called only from within lan743x_tx_xmit_frame.
1383 	 * assuming tx->ring_lock has already been acquired.
1384 	 */
1385 	struct lan743x_tx_descriptor *tx_descriptor = NULL;
1386 	struct lan743x_tx_buffer_info *buffer_info = NULL;
1387 	struct lan743x_adapter *adapter = tx->adapter;
1388 	struct device *dev = &adapter->pdev->dev;
1389 	dma_addr_t dma_ptr;
1390 
1391 	tx->frame_flags |= TX_FRAME_FLAG_IN_PROGRESS;
1392 	tx->frame_first = tx->last_tail;
1393 	tx->frame_tail = tx->frame_first;
1394 
1395 	tx_descriptor = &tx->ring_cpu_ptr[tx->frame_tail];
1396 	buffer_info = &tx->buffer_info[tx->frame_tail];
1397 	dma_ptr = dma_map_single(dev, first_buffer, first_buffer_length,
1398 				 DMA_TO_DEVICE);
1399 	if (dma_mapping_error(dev, dma_ptr))
1400 		return -ENOMEM;
1401 
1402 	tx_descriptor->data1 = cpu_to_le32(DMA_ADDR_LOW32(dma_ptr));
1403 	tx_descriptor->data2 = cpu_to_le32(DMA_ADDR_HIGH32(dma_ptr));
1404 	tx_descriptor->data3 = cpu_to_le32((frame_length << 16) &
1405 		TX_DESC_DATA3_FRAME_LENGTH_MSS_MASK_);
1406 
1407 	buffer_info->skb = NULL;
1408 	buffer_info->dma_ptr = dma_ptr;
1409 	buffer_info->buffer_length = first_buffer_length;
1410 	buffer_info->flags |= TX_BUFFER_INFO_FLAG_ACTIVE;
1411 
1412 	tx->frame_data0 = (first_buffer_length &
1413 		TX_DESC_DATA0_BUF_LENGTH_MASK_) |
1414 		TX_DESC_DATA0_DTYPE_DATA_ |
1415 		TX_DESC_DATA0_FS_ |
1416 		TX_DESC_DATA0_FCS_;
1417 	if (time_stamp)
1418 		tx->frame_data0 |= TX_DESC_DATA0_TSE_;
1419 
1420 	if (check_sum)
1421 		tx->frame_data0 |= TX_DESC_DATA0_ICE_ |
1422 				   TX_DESC_DATA0_IPE_ |
1423 				   TX_DESC_DATA0_TPE_;
1424 
1425 	/* data0 will be programmed in one of other frame assembler functions */
1426 	return 0;
1427 }
1428 
1429 static void lan743x_tx_frame_add_lso(struct lan743x_tx *tx,
1430 				     unsigned int frame_length,
1431 				     int nr_frags)
1432 {
1433 	/* called only from within lan743x_tx_xmit_frame.
1434 	 * assuming tx->ring_lock has already been acquired.
1435 	 */
1436 	struct lan743x_tx_descriptor *tx_descriptor = NULL;
1437 	struct lan743x_tx_buffer_info *buffer_info = NULL;
1438 
1439 	/* wrap up previous descriptor */
1440 	tx->frame_data0 |= TX_DESC_DATA0_EXT_;
1441 	if (nr_frags <= 0) {
1442 		tx->frame_data0 |= TX_DESC_DATA0_LS_;
1443 		tx->frame_data0 |= TX_DESC_DATA0_IOC_;
1444 	}
1445 	tx_descriptor = &tx->ring_cpu_ptr[tx->frame_tail];
1446 	tx_descriptor->data0 = cpu_to_le32(tx->frame_data0);
1447 
1448 	/* move to next descriptor */
1449 	tx->frame_tail = lan743x_tx_next_index(tx, tx->frame_tail);
1450 	tx_descriptor = &tx->ring_cpu_ptr[tx->frame_tail];
1451 	buffer_info = &tx->buffer_info[tx->frame_tail];
1452 
1453 	/* add extension descriptor */
1454 	tx_descriptor->data1 = 0;
1455 	tx_descriptor->data2 = 0;
1456 	tx_descriptor->data3 = 0;
1457 
1458 	buffer_info->skb = NULL;
1459 	buffer_info->dma_ptr = 0;
1460 	buffer_info->buffer_length = 0;
1461 	buffer_info->flags |= TX_BUFFER_INFO_FLAG_ACTIVE;
1462 
1463 	tx->frame_data0 = (frame_length & TX_DESC_DATA0_EXT_PAY_LENGTH_MASK_) |
1464 			  TX_DESC_DATA0_DTYPE_EXT_ |
1465 			  TX_DESC_DATA0_EXT_LSO_;
1466 
1467 	/* data0 will be programmed in one of other frame assembler functions */
1468 }
1469 
1470 static int lan743x_tx_frame_add_fragment(struct lan743x_tx *tx,
1471 					 const skb_frag_t *fragment,
1472 					 unsigned int frame_length)
1473 {
1474 	/* called only from within lan743x_tx_xmit_frame
1475 	 * assuming tx->ring_lock has already been acquired
1476 	 */
1477 	struct lan743x_tx_descriptor *tx_descriptor = NULL;
1478 	struct lan743x_tx_buffer_info *buffer_info = NULL;
1479 	struct lan743x_adapter *adapter = tx->adapter;
1480 	struct device *dev = &adapter->pdev->dev;
1481 	unsigned int fragment_length = 0;
1482 	dma_addr_t dma_ptr;
1483 
1484 	fragment_length = skb_frag_size(fragment);
1485 	if (!fragment_length)
1486 		return 0;
1487 
1488 	/* wrap up previous descriptor */
1489 	tx_descriptor = &tx->ring_cpu_ptr[tx->frame_tail];
1490 	tx_descriptor->data0 = cpu_to_le32(tx->frame_data0);
1491 
1492 	/* move to next descriptor */
1493 	tx->frame_tail = lan743x_tx_next_index(tx, tx->frame_tail);
1494 	tx_descriptor = &tx->ring_cpu_ptr[tx->frame_tail];
1495 	buffer_info = &tx->buffer_info[tx->frame_tail];
1496 	dma_ptr = skb_frag_dma_map(dev, fragment,
1497 				   0, fragment_length,
1498 				   DMA_TO_DEVICE);
1499 	if (dma_mapping_error(dev, dma_ptr)) {
1500 		int desc_index;
1501 
1502 		/* cleanup all previously setup descriptors */
1503 		desc_index = tx->frame_first;
1504 		while (desc_index != tx->frame_tail) {
1505 			lan743x_tx_release_desc(tx, desc_index, true);
1506 			desc_index = lan743x_tx_next_index(tx, desc_index);
1507 		}
1508 		dma_wmb();
1509 		tx->frame_flags &= ~TX_FRAME_FLAG_IN_PROGRESS;
1510 		tx->frame_first = 0;
1511 		tx->frame_data0 = 0;
1512 		tx->frame_tail = 0;
1513 		return -ENOMEM;
1514 	}
1515 
1516 	tx_descriptor->data1 = cpu_to_le32(DMA_ADDR_LOW32(dma_ptr));
1517 	tx_descriptor->data2 = cpu_to_le32(DMA_ADDR_HIGH32(dma_ptr));
1518 	tx_descriptor->data3 = cpu_to_le32((frame_length << 16) &
1519 			       TX_DESC_DATA3_FRAME_LENGTH_MSS_MASK_);
1520 
1521 	buffer_info->skb = NULL;
1522 	buffer_info->dma_ptr = dma_ptr;
1523 	buffer_info->buffer_length = fragment_length;
1524 	buffer_info->flags |= TX_BUFFER_INFO_FLAG_ACTIVE;
1525 	buffer_info->flags |= TX_BUFFER_INFO_FLAG_SKB_FRAGMENT;
1526 
1527 	tx->frame_data0 = (fragment_length & TX_DESC_DATA0_BUF_LENGTH_MASK_) |
1528 			  TX_DESC_DATA0_DTYPE_DATA_ |
1529 			  TX_DESC_DATA0_FCS_;
1530 
1531 	/* data0 will be programmed in one of other frame assembler functions */
1532 	return 0;
1533 }
1534 
1535 static void lan743x_tx_frame_end(struct lan743x_tx *tx,
1536 				 struct sk_buff *skb,
1537 				 bool time_stamp,
1538 				 bool ignore_sync)
1539 {
1540 	/* called only from within lan743x_tx_xmit_frame
1541 	 * assuming tx->ring_lock has already been acquired
1542 	 */
1543 	struct lan743x_tx_descriptor *tx_descriptor = NULL;
1544 	struct lan743x_tx_buffer_info *buffer_info = NULL;
1545 	struct lan743x_adapter *adapter = tx->adapter;
1546 	u32 tx_tail_flags = 0;
1547 
1548 	/* wrap up previous descriptor */
1549 	if ((tx->frame_data0 & TX_DESC_DATA0_DTYPE_MASK_) ==
1550 	    TX_DESC_DATA0_DTYPE_DATA_) {
1551 		tx->frame_data0 |= TX_DESC_DATA0_LS_;
1552 		tx->frame_data0 |= TX_DESC_DATA0_IOC_;
1553 	}
1554 
1555 	tx_descriptor = &tx->ring_cpu_ptr[tx->frame_tail];
1556 	buffer_info = &tx->buffer_info[tx->frame_tail];
1557 	buffer_info->skb = skb;
1558 	if (time_stamp)
1559 		buffer_info->flags |= TX_BUFFER_INFO_FLAG_TIMESTAMP_REQUESTED;
1560 	if (ignore_sync)
1561 		buffer_info->flags |= TX_BUFFER_INFO_FLAG_IGNORE_SYNC;
1562 
1563 	tx_descriptor->data0 = cpu_to_le32(tx->frame_data0);
1564 	tx->frame_tail = lan743x_tx_next_index(tx, tx->frame_tail);
1565 	tx->last_tail = tx->frame_tail;
1566 
1567 	dma_wmb();
1568 
1569 	if (tx->vector_flags & LAN743X_VECTOR_FLAG_VECTOR_ENABLE_AUTO_SET)
1570 		tx_tail_flags |= TX_TAIL_SET_TOP_INT_VEC_EN_;
1571 	if (tx->vector_flags & LAN743X_VECTOR_FLAG_SOURCE_ENABLE_AUTO_SET)
1572 		tx_tail_flags |= TX_TAIL_SET_DMAC_INT_EN_ |
1573 		TX_TAIL_SET_TOP_INT_EN_;
1574 
1575 	lan743x_csr_write(adapter, TX_TAIL(tx->channel_number),
1576 			  tx_tail_flags | tx->frame_tail);
1577 	tx->frame_flags &= ~TX_FRAME_FLAG_IN_PROGRESS;
1578 }
1579 
1580 static netdev_tx_t lan743x_tx_xmit_frame(struct lan743x_tx *tx,
1581 					 struct sk_buff *skb)
1582 {
1583 	int required_number_of_descriptors = 0;
1584 	unsigned int start_frame_length = 0;
1585 	unsigned int frame_length = 0;
1586 	unsigned int head_length = 0;
1587 	unsigned long irq_flags = 0;
1588 	bool do_timestamp = false;
1589 	bool ignore_sync = false;
1590 	int nr_frags = 0;
1591 	bool gso = false;
1592 	int j;
1593 
1594 	required_number_of_descriptors = lan743x_tx_get_desc_cnt(tx, skb);
1595 
1596 	spin_lock_irqsave(&tx->ring_lock, irq_flags);
1597 	if (required_number_of_descriptors >
1598 		lan743x_tx_get_avail_desc(tx)) {
1599 		if (required_number_of_descriptors > (tx->ring_size - 1)) {
1600 			dev_kfree_skb_irq(skb);
1601 		} else {
1602 			/* save to overflow buffer */
1603 			tx->overflow_skb = skb;
1604 			netif_stop_queue(tx->adapter->netdev);
1605 		}
1606 		goto unlock;
1607 	}
1608 
1609 	/* space available, transmit skb  */
1610 	if ((skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP) &&
1611 	    (tx->ts_flags & TX_TS_FLAG_TIMESTAMPING_ENABLED) &&
1612 	    (lan743x_ptp_request_tx_timestamp(tx->adapter))) {
1613 		skb_shinfo(skb)->tx_flags |= SKBTX_IN_PROGRESS;
1614 		do_timestamp = true;
1615 		if (tx->ts_flags & TX_TS_FLAG_ONE_STEP_SYNC)
1616 			ignore_sync = true;
1617 	}
1618 	head_length = skb_headlen(skb);
1619 	frame_length = skb_pagelen(skb);
1620 	nr_frags = skb_shinfo(skb)->nr_frags;
1621 	start_frame_length = frame_length;
1622 	gso = skb_is_gso(skb);
1623 	if (gso) {
1624 		start_frame_length = max(skb_shinfo(skb)->gso_size,
1625 					 (unsigned short)8);
1626 	}
1627 
1628 	if (lan743x_tx_frame_start(tx,
1629 				   skb->data, head_length,
1630 				   start_frame_length,
1631 				   do_timestamp,
1632 				   skb->ip_summed == CHECKSUM_PARTIAL)) {
1633 		dev_kfree_skb_irq(skb);
1634 		goto unlock;
1635 	}
1636 
1637 	if (gso)
1638 		lan743x_tx_frame_add_lso(tx, frame_length, nr_frags);
1639 
1640 	if (nr_frags <= 0)
1641 		goto finish;
1642 
1643 	for (j = 0; j < nr_frags; j++) {
1644 		const skb_frag_t *frag = &(skb_shinfo(skb)->frags[j]);
1645 
1646 		if (lan743x_tx_frame_add_fragment(tx, frag, frame_length)) {
1647 			/* upon error no need to call
1648 			 *	lan743x_tx_frame_end
1649 			 * frame assembler clean up was performed inside
1650 			 *	lan743x_tx_frame_add_fragment
1651 			 */
1652 			dev_kfree_skb_irq(skb);
1653 			goto unlock;
1654 		}
1655 	}
1656 
1657 finish:
1658 	lan743x_tx_frame_end(tx, skb, do_timestamp, ignore_sync);
1659 
1660 unlock:
1661 	spin_unlock_irqrestore(&tx->ring_lock, irq_flags);
1662 	return NETDEV_TX_OK;
1663 }
1664 
1665 static int lan743x_tx_napi_poll(struct napi_struct *napi, int weight)
1666 {
1667 	struct lan743x_tx *tx = container_of(napi, struct lan743x_tx, napi);
1668 	struct lan743x_adapter *adapter = tx->adapter;
1669 	bool start_transmitter = false;
1670 	unsigned long irq_flags = 0;
1671 	u32 ioc_bit = 0;
1672 
1673 	ioc_bit = DMAC_INT_BIT_TX_IOC_(tx->channel_number);
1674 	lan743x_csr_read(adapter, DMAC_INT_STS);
1675 	if (tx->vector_flags & LAN743X_VECTOR_FLAG_SOURCE_STATUS_W2C)
1676 		lan743x_csr_write(adapter, DMAC_INT_STS, ioc_bit);
1677 	spin_lock_irqsave(&tx->ring_lock, irq_flags);
1678 
1679 	/* clean up tx ring */
1680 	lan743x_tx_release_completed_descriptors(tx);
1681 	if (netif_queue_stopped(adapter->netdev)) {
1682 		if (tx->overflow_skb) {
1683 			if (lan743x_tx_get_desc_cnt(tx, tx->overflow_skb) <=
1684 				lan743x_tx_get_avail_desc(tx))
1685 				start_transmitter = true;
1686 		} else {
1687 			netif_wake_queue(adapter->netdev);
1688 		}
1689 	}
1690 	spin_unlock_irqrestore(&tx->ring_lock, irq_flags);
1691 
1692 	if (start_transmitter) {
1693 		/* space is now available, transmit overflow skb */
1694 		lan743x_tx_xmit_frame(tx, tx->overflow_skb);
1695 		tx->overflow_skb = NULL;
1696 		netif_wake_queue(adapter->netdev);
1697 	}
1698 
1699 	if (!napi_complete(napi))
1700 		goto done;
1701 
1702 	/* enable isr */
1703 	lan743x_csr_write(adapter, INT_EN_SET,
1704 			  INT_BIT_DMA_TX_(tx->channel_number));
1705 	lan743x_csr_read(adapter, INT_STS);
1706 
1707 done:
1708 	return 0;
1709 }
1710 
1711 static void lan743x_tx_ring_cleanup(struct lan743x_tx *tx)
1712 {
1713 	if (tx->head_cpu_ptr) {
1714 		dma_free_coherent(&tx->adapter->pdev->dev,
1715 				  sizeof(*tx->head_cpu_ptr), tx->head_cpu_ptr,
1716 				  tx->head_dma_ptr);
1717 		tx->head_cpu_ptr = NULL;
1718 		tx->head_dma_ptr = 0;
1719 	}
1720 	kfree(tx->buffer_info);
1721 	tx->buffer_info = NULL;
1722 
1723 	if (tx->ring_cpu_ptr) {
1724 		dma_free_coherent(&tx->adapter->pdev->dev,
1725 				  tx->ring_allocation_size, tx->ring_cpu_ptr,
1726 				  tx->ring_dma_ptr);
1727 		tx->ring_allocation_size = 0;
1728 		tx->ring_cpu_ptr = NULL;
1729 		tx->ring_dma_ptr = 0;
1730 	}
1731 	tx->ring_size = 0;
1732 }
1733 
1734 static int lan743x_tx_ring_init(struct lan743x_tx *tx)
1735 {
1736 	size_t ring_allocation_size = 0;
1737 	void *cpu_ptr = NULL;
1738 	dma_addr_t dma_ptr;
1739 	int ret = -ENOMEM;
1740 
1741 	tx->ring_size = LAN743X_TX_RING_SIZE;
1742 	if (tx->ring_size & ~TX_CFG_B_TX_RING_LEN_MASK_) {
1743 		ret = -EINVAL;
1744 		goto cleanup;
1745 	}
1746 	ring_allocation_size = ALIGN(tx->ring_size *
1747 				     sizeof(struct lan743x_tx_descriptor),
1748 				     PAGE_SIZE);
1749 	dma_ptr = 0;
1750 	cpu_ptr = dma_alloc_coherent(&tx->adapter->pdev->dev,
1751 				     ring_allocation_size, &dma_ptr, GFP_KERNEL);
1752 	if (!cpu_ptr) {
1753 		ret = -ENOMEM;
1754 		goto cleanup;
1755 	}
1756 
1757 	tx->ring_allocation_size = ring_allocation_size;
1758 	tx->ring_cpu_ptr = (struct lan743x_tx_descriptor *)cpu_ptr;
1759 	tx->ring_dma_ptr = dma_ptr;
1760 
1761 	cpu_ptr = kcalloc(tx->ring_size, sizeof(*tx->buffer_info), GFP_KERNEL);
1762 	if (!cpu_ptr) {
1763 		ret = -ENOMEM;
1764 		goto cleanup;
1765 	}
1766 	tx->buffer_info = (struct lan743x_tx_buffer_info *)cpu_ptr;
1767 	dma_ptr = 0;
1768 	cpu_ptr = dma_alloc_coherent(&tx->adapter->pdev->dev,
1769 				     sizeof(*tx->head_cpu_ptr), &dma_ptr,
1770 				     GFP_KERNEL);
1771 	if (!cpu_ptr) {
1772 		ret = -ENOMEM;
1773 		goto cleanup;
1774 	}
1775 
1776 	tx->head_cpu_ptr = cpu_ptr;
1777 	tx->head_dma_ptr = dma_ptr;
1778 	if (tx->head_dma_ptr & 0x3) {
1779 		ret = -ENOMEM;
1780 		goto cleanup;
1781 	}
1782 
1783 	return 0;
1784 
1785 cleanup:
1786 	lan743x_tx_ring_cleanup(tx);
1787 	return ret;
1788 }
1789 
1790 static void lan743x_tx_close(struct lan743x_tx *tx)
1791 {
1792 	struct lan743x_adapter *adapter = tx->adapter;
1793 
1794 	lan743x_csr_write(adapter,
1795 			  DMAC_CMD,
1796 			  DMAC_CMD_STOP_T_(tx->channel_number));
1797 	lan743x_dmac_tx_wait_till_stopped(adapter, tx->channel_number);
1798 
1799 	lan743x_csr_write(adapter,
1800 			  DMAC_INT_EN_CLR,
1801 			  DMAC_INT_BIT_TX_IOC_(tx->channel_number));
1802 	lan743x_csr_write(adapter, INT_EN_CLR,
1803 			  INT_BIT_DMA_TX_(tx->channel_number));
1804 	napi_disable(&tx->napi);
1805 	netif_napi_del(&tx->napi);
1806 
1807 	lan743x_csr_write(adapter, FCT_TX_CTL,
1808 			  FCT_TX_CTL_DIS_(tx->channel_number));
1809 	lan743x_csr_wait_for_bit(adapter, FCT_TX_CTL,
1810 				 FCT_TX_CTL_EN_(tx->channel_number),
1811 				 0, 1000, 20000, 100);
1812 
1813 	lan743x_tx_release_all_descriptors(tx);
1814 
1815 	if (tx->overflow_skb) {
1816 		dev_kfree_skb(tx->overflow_skb);
1817 		tx->overflow_skb = NULL;
1818 	}
1819 
1820 	lan743x_tx_ring_cleanup(tx);
1821 }
1822 
1823 static int lan743x_tx_open(struct lan743x_tx *tx)
1824 {
1825 	struct lan743x_adapter *adapter = NULL;
1826 	u32 data = 0;
1827 	int ret;
1828 
1829 	adapter = tx->adapter;
1830 	ret = lan743x_tx_ring_init(tx);
1831 	if (ret)
1832 		return ret;
1833 
1834 	/* initialize fifo */
1835 	lan743x_csr_write(adapter, FCT_TX_CTL,
1836 			  FCT_TX_CTL_RESET_(tx->channel_number));
1837 	lan743x_csr_wait_for_bit(adapter, FCT_TX_CTL,
1838 				 FCT_TX_CTL_RESET_(tx->channel_number),
1839 				 0, 1000, 20000, 100);
1840 
1841 	/* enable fifo */
1842 	lan743x_csr_write(adapter, FCT_TX_CTL,
1843 			  FCT_TX_CTL_EN_(tx->channel_number));
1844 
1845 	/* reset tx channel */
1846 	lan743x_csr_write(adapter, DMAC_CMD,
1847 			  DMAC_CMD_TX_SWR_(tx->channel_number));
1848 	lan743x_csr_wait_for_bit(adapter, DMAC_CMD,
1849 				 DMAC_CMD_TX_SWR_(tx->channel_number),
1850 				 0, 1000, 20000, 100);
1851 
1852 	/* Write TX_BASE_ADDR */
1853 	lan743x_csr_write(adapter,
1854 			  TX_BASE_ADDRH(tx->channel_number),
1855 			  DMA_ADDR_HIGH32(tx->ring_dma_ptr));
1856 	lan743x_csr_write(adapter,
1857 			  TX_BASE_ADDRL(tx->channel_number),
1858 			  DMA_ADDR_LOW32(tx->ring_dma_ptr));
1859 
1860 	/* Write TX_CFG_B */
1861 	data = lan743x_csr_read(adapter, TX_CFG_B(tx->channel_number));
1862 	data &= ~TX_CFG_B_TX_RING_LEN_MASK_;
1863 	data |= ((tx->ring_size) & TX_CFG_B_TX_RING_LEN_MASK_);
1864 	if (!(adapter->csr.flags & LAN743X_CSR_FLAG_IS_A0))
1865 		data |= TX_CFG_B_TDMABL_512_;
1866 	lan743x_csr_write(adapter, TX_CFG_B(tx->channel_number), data);
1867 
1868 	/* Write TX_CFG_A */
1869 	data = TX_CFG_A_TX_TMR_HPWB_SEL_IOC_ | TX_CFG_A_TX_HP_WB_EN_;
1870 	if (!(adapter->csr.flags & LAN743X_CSR_FLAG_IS_A0)) {
1871 		data |= TX_CFG_A_TX_HP_WB_ON_INT_TMR_;
1872 		data |= TX_CFG_A_TX_PF_THRES_SET_(0x10);
1873 		data |= TX_CFG_A_TX_PF_PRI_THRES_SET_(0x04);
1874 		data |= TX_CFG_A_TX_HP_WB_THRES_SET_(0x07);
1875 	}
1876 	lan743x_csr_write(adapter, TX_CFG_A(tx->channel_number), data);
1877 
1878 	/* Write TX_HEAD_WRITEBACK_ADDR */
1879 	lan743x_csr_write(adapter,
1880 			  TX_HEAD_WRITEBACK_ADDRH(tx->channel_number),
1881 			  DMA_ADDR_HIGH32(tx->head_dma_ptr));
1882 	lan743x_csr_write(adapter,
1883 			  TX_HEAD_WRITEBACK_ADDRL(tx->channel_number),
1884 			  DMA_ADDR_LOW32(tx->head_dma_ptr));
1885 
1886 	/* set last head */
1887 	tx->last_head = lan743x_csr_read(adapter, TX_HEAD(tx->channel_number));
1888 
1889 	/* write TX_TAIL */
1890 	tx->last_tail = 0;
1891 	lan743x_csr_write(adapter, TX_TAIL(tx->channel_number),
1892 			  (u32)(tx->last_tail));
1893 	tx->vector_flags = lan743x_intr_get_vector_flags(adapter,
1894 							 INT_BIT_DMA_TX_
1895 							 (tx->channel_number));
1896 	netif_tx_napi_add(adapter->netdev,
1897 			  &tx->napi, lan743x_tx_napi_poll,
1898 			  tx->ring_size - 1);
1899 	napi_enable(&tx->napi);
1900 
1901 	data = 0;
1902 	if (tx->vector_flags & LAN743X_VECTOR_FLAG_SOURCE_ENABLE_AUTO_CLEAR)
1903 		data |= TX_CFG_C_TX_TOP_INT_EN_AUTO_CLR_;
1904 	if (tx->vector_flags & LAN743X_VECTOR_FLAG_SOURCE_STATUS_AUTO_CLEAR)
1905 		data |= TX_CFG_C_TX_DMA_INT_STS_AUTO_CLR_;
1906 	if (tx->vector_flags & LAN743X_VECTOR_FLAG_SOURCE_STATUS_R2C)
1907 		data |= TX_CFG_C_TX_INT_STS_R2C_MODE_MASK_;
1908 	if (tx->vector_flags & LAN743X_VECTOR_FLAG_SOURCE_ENABLE_R2C)
1909 		data |= TX_CFG_C_TX_INT_EN_R2C_;
1910 	lan743x_csr_write(adapter, TX_CFG_C(tx->channel_number), data);
1911 
1912 	if (!(tx->vector_flags & LAN743X_VECTOR_FLAG_SOURCE_ENABLE_AUTO_SET))
1913 		lan743x_csr_write(adapter, INT_EN_SET,
1914 				  INT_BIT_DMA_TX_(tx->channel_number));
1915 	lan743x_csr_write(adapter, DMAC_INT_EN_SET,
1916 			  DMAC_INT_BIT_TX_IOC_(tx->channel_number));
1917 
1918 	/*  start dmac channel */
1919 	lan743x_csr_write(adapter, DMAC_CMD,
1920 			  DMAC_CMD_START_T_(tx->channel_number));
1921 	return 0;
1922 }
1923 
1924 static int lan743x_rx_next_index(struct lan743x_rx *rx, int index)
1925 {
1926 	return ((++index) % rx->ring_size);
1927 }
1928 
1929 static void lan743x_rx_update_tail(struct lan743x_rx *rx, int index)
1930 {
1931 	/* update the tail once per 8 descriptors */
1932 	if ((index & 7) == 7)
1933 		lan743x_csr_write(rx->adapter, RX_TAIL(rx->channel_number),
1934 				  index);
1935 }
1936 
1937 static int lan743x_rx_init_ring_element(struct lan743x_rx *rx, int index)
1938 {
1939 	struct net_device *netdev = rx->adapter->netdev;
1940 	struct device *dev = &rx->adapter->pdev->dev;
1941 	struct lan743x_rx_buffer_info *buffer_info;
1942 	unsigned int buffer_length, used_length;
1943 	struct lan743x_rx_descriptor *descriptor;
1944 	struct sk_buff *skb;
1945 	dma_addr_t dma_ptr;
1946 
1947 	buffer_length = netdev->mtu + ETH_HLEN + ETH_FCS_LEN + RX_HEAD_PADDING;
1948 
1949 	descriptor = &rx->ring_cpu_ptr[index];
1950 	buffer_info = &rx->buffer_info[index];
1951 	skb = __netdev_alloc_skb(netdev, buffer_length, GFP_ATOMIC | GFP_DMA);
1952 	if (!skb)
1953 		return -ENOMEM;
1954 	dma_ptr = dma_map_single(dev, skb->data, buffer_length, DMA_FROM_DEVICE);
1955 	if (dma_mapping_error(dev, dma_ptr)) {
1956 		dev_kfree_skb_any(skb);
1957 		return -ENOMEM;
1958 	}
1959 	if (buffer_info->dma_ptr) {
1960 		/* sync used area of buffer only */
1961 		if (le32_to_cpu(descriptor->data0) & RX_DESC_DATA0_LS_)
1962 			/* frame length is valid only if LS bit is set.
1963 			 * it's a safe upper bound for the used area in this
1964 			 * buffer.
1965 			 */
1966 			used_length = min(RX_DESC_DATA0_FRAME_LENGTH_GET_
1967 					  (le32_to_cpu(descriptor->data0)),
1968 					  buffer_info->buffer_length);
1969 		else
1970 			used_length = buffer_info->buffer_length;
1971 		dma_sync_single_for_cpu(dev, buffer_info->dma_ptr,
1972 					used_length,
1973 					DMA_FROM_DEVICE);
1974 		dma_unmap_single_attrs(dev, buffer_info->dma_ptr,
1975 				       buffer_info->buffer_length,
1976 				       DMA_FROM_DEVICE,
1977 				       DMA_ATTR_SKIP_CPU_SYNC);
1978 	}
1979 
1980 	buffer_info->skb = skb;
1981 	buffer_info->dma_ptr = dma_ptr;
1982 	buffer_info->buffer_length = buffer_length;
1983 	descriptor->data1 = cpu_to_le32(DMA_ADDR_LOW32(buffer_info->dma_ptr));
1984 	descriptor->data2 = cpu_to_le32(DMA_ADDR_HIGH32(buffer_info->dma_ptr));
1985 	descriptor->data3 = 0;
1986 	descriptor->data0 = cpu_to_le32((RX_DESC_DATA0_OWN_ |
1987 			    (buffer_length & RX_DESC_DATA0_BUF_LENGTH_MASK_)));
1988 	lan743x_rx_update_tail(rx, index);
1989 
1990 	return 0;
1991 }
1992 
1993 static void lan743x_rx_reuse_ring_element(struct lan743x_rx *rx, int index)
1994 {
1995 	struct lan743x_rx_buffer_info *buffer_info;
1996 	struct lan743x_rx_descriptor *descriptor;
1997 
1998 	descriptor = &rx->ring_cpu_ptr[index];
1999 	buffer_info = &rx->buffer_info[index];
2000 
2001 	descriptor->data1 = cpu_to_le32(DMA_ADDR_LOW32(buffer_info->dma_ptr));
2002 	descriptor->data2 = cpu_to_le32(DMA_ADDR_HIGH32(buffer_info->dma_ptr));
2003 	descriptor->data3 = 0;
2004 	descriptor->data0 = cpu_to_le32((RX_DESC_DATA0_OWN_ |
2005 			    ((buffer_info->buffer_length) &
2006 			    RX_DESC_DATA0_BUF_LENGTH_MASK_)));
2007 	lan743x_rx_update_tail(rx, index);
2008 }
2009 
2010 static void lan743x_rx_release_ring_element(struct lan743x_rx *rx, int index)
2011 {
2012 	struct lan743x_rx_buffer_info *buffer_info;
2013 	struct lan743x_rx_descriptor *descriptor;
2014 
2015 	descriptor = &rx->ring_cpu_ptr[index];
2016 	buffer_info = &rx->buffer_info[index];
2017 
2018 	memset(descriptor, 0, sizeof(*descriptor));
2019 
2020 	if (buffer_info->dma_ptr) {
2021 		dma_unmap_single(&rx->adapter->pdev->dev,
2022 				 buffer_info->dma_ptr,
2023 				 buffer_info->buffer_length,
2024 				 DMA_FROM_DEVICE);
2025 		buffer_info->dma_ptr = 0;
2026 	}
2027 
2028 	if (buffer_info->skb) {
2029 		dev_kfree_skb(buffer_info->skb);
2030 		buffer_info->skb = NULL;
2031 	}
2032 
2033 	memset(buffer_info, 0, sizeof(*buffer_info));
2034 }
2035 
2036 static struct sk_buff *
2037 lan743x_rx_trim_skb(struct sk_buff *skb, int frame_length)
2038 {
2039 	if (skb_linearize(skb)) {
2040 		dev_kfree_skb_irq(skb);
2041 		return NULL;
2042 	}
2043 	frame_length = max_t(int, 0, frame_length - ETH_FCS_LEN);
2044 	if (skb->len > frame_length) {
2045 		skb->tail -= skb->len - frame_length;
2046 		skb->len = frame_length;
2047 	}
2048 	return skb;
2049 }
2050 
2051 static int lan743x_rx_process_buffer(struct lan743x_rx *rx)
2052 {
2053 	int current_head_index = le32_to_cpu(*rx->head_cpu_ptr);
2054 	struct lan743x_rx_descriptor *descriptor, *desc_ext;
2055 	struct net_device *netdev = rx->adapter->netdev;
2056 	int result = RX_PROCESS_RESULT_NOTHING_TO_DO;
2057 	struct lan743x_rx_buffer_info *buffer_info;
2058 	int frame_length, buffer_length;
2059 	int extension_index = -1;
2060 	bool is_last, is_first;
2061 	struct sk_buff *skb;
2062 
2063 	if (current_head_index < 0 || current_head_index >= rx->ring_size)
2064 		goto done;
2065 
2066 	if (rx->last_head < 0 || rx->last_head >= rx->ring_size)
2067 		goto done;
2068 
2069 	if (rx->last_head == current_head_index)
2070 		goto done;
2071 
2072 	descriptor = &rx->ring_cpu_ptr[rx->last_head];
2073 	if (le32_to_cpu(descriptor->data0) & RX_DESC_DATA0_OWN_)
2074 		goto done;
2075 	buffer_info = &rx->buffer_info[rx->last_head];
2076 
2077 	is_last = le32_to_cpu(descriptor->data0) & RX_DESC_DATA0_LS_;
2078 	is_first = le32_to_cpu(descriptor->data0) & RX_DESC_DATA0_FS_;
2079 
2080 	if (is_last && le32_to_cpu(descriptor->data0) & RX_DESC_DATA0_EXT_) {
2081 		/* extension is expected to follow */
2082 		int index = lan743x_rx_next_index(rx, rx->last_head);
2083 
2084 		if (index == current_head_index)
2085 			/* extension not yet available */
2086 			goto done;
2087 		desc_ext = &rx->ring_cpu_ptr[index];
2088 		if (le32_to_cpu(desc_ext->data0) & RX_DESC_DATA0_OWN_)
2089 			/* extension not yet available */
2090 			goto done;
2091 		if (!(le32_to_cpu(desc_ext->data0) & RX_DESC_DATA0_EXT_))
2092 			goto move_forward;
2093 		extension_index = index;
2094 	}
2095 
2096 	/* Only the last buffer in a multi-buffer frame contains the total frame
2097 	 * length. The chip occasionally sends more buffers than strictly
2098 	 * required to reach the total frame length.
2099 	 * Handle this by adding all buffers to the skb in their entirety.
2100 	 * Once the real frame length is known, trim the skb.
2101 	 */
2102 	frame_length =
2103 		RX_DESC_DATA0_FRAME_LENGTH_GET_(le32_to_cpu(descriptor->data0));
2104 	buffer_length = buffer_info->buffer_length;
2105 
2106 	netdev_dbg(netdev, "%s%schunk: %d/%d",
2107 		   is_first ? "first " : "      ",
2108 		   is_last  ? "last  " : "      ",
2109 		   frame_length, buffer_length);
2110 
2111 	/* save existing skb, allocate new skb and map to dma */
2112 	skb = buffer_info->skb;
2113 	if (lan743x_rx_init_ring_element(rx, rx->last_head)) {
2114 		/* failed to allocate next skb.
2115 		 * Memory is very low.
2116 		 * Drop this packet and reuse buffer.
2117 		 */
2118 		lan743x_rx_reuse_ring_element(rx, rx->last_head);
2119 		/* drop packet that was being assembled */
2120 		dev_kfree_skb_irq(rx->skb_head);
2121 		rx->skb_head = NULL;
2122 		goto process_extension;
2123 	}
2124 
2125 	/* add buffers to skb via skb->frag_list */
2126 	if (is_first) {
2127 		skb_reserve(skb, RX_HEAD_PADDING);
2128 		skb_put(skb, buffer_length - RX_HEAD_PADDING);
2129 		if (rx->skb_head)
2130 			dev_kfree_skb_irq(rx->skb_head);
2131 		rx->skb_head = skb;
2132 	} else if (rx->skb_head) {
2133 		skb_put(skb, buffer_length);
2134 		if (skb_shinfo(rx->skb_head)->frag_list)
2135 			rx->skb_tail->next = skb;
2136 		else
2137 			skb_shinfo(rx->skb_head)->frag_list = skb;
2138 		rx->skb_tail = skb;
2139 		rx->skb_head->len += skb->len;
2140 		rx->skb_head->data_len += skb->len;
2141 		rx->skb_head->truesize += skb->truesize;
2142 	} else {
2143 		/* packet to assemble has already been dropped because one or
2144 		 * more of its buffers could not be allocated
2145 		 */
2146 		netdev_dbg(netdev, "drop buffer intended for dropped packet");
2147 		dev_kfree_skb_irq(skb);
2148 	}
2149 
2150 process_extension:
2151 	if (extension_index >= 0) {
2152 		u32 ts_sec;
2153 		u32 ts_nsec;
2154 
2155 		ts_sec = le32_to_cpu(desc_ext->data1);
2156 		ts_nsec = (le32_to_cpu(desc_ext->data2) &
2157 			  RX_DESC_DATA2_TS_NS_MASK_);
2158 		if (rx->skb_head)
2159 			skb_hwtstamps(rx->skb_head)->hwtstamp =
2160 				ktime_set(ts_sec, ts_nsec);
2161 		lan743x_rx_reuse_ring_element(rx, extension_index);
2162 		rx->last_head = extension_index;
2163 		netdev_dbg(netdev, "process extension");
2164 	}
2165 
2166 	if (is_last && rx->skb_head)
2167 		rx->skb_head = lan743x_rx_trim_skb(rx->skb_head, frame_length);
2168 
2169 	if (is_last && rx->skb_head) {
2170 		rx->skb_head->protocol = eth_type_trans(rx->skb_head,
2171 							rx->adapter->netdev);
2172 		netdev_dbg(netdev, "sending %d byte frame to OS",
2173 			   rx->skb_head->len);
2174 		napi_gro_receive(&rx->napi, rx->skb_head);
2175 		rx->skb_head = NULL;
2176 	}
2177 
2178 move_forward:
2179 	/* push tail and head forward */
2180 	rx->last_tail = rx->last_head;
2181 	rx->last_head = lan743x_rx_next_index(rx, rx->last_head);
2182 	result = RX_PROCESS_RESULT_BUFFER_RECEIVED;
2183 done:
2184 	return result;
2185 }
2186 
2187 static int lan743x_rx_napi_poll(struct napi_struct *napi, int weight)
2188 {
2189 	struct lan743x_rx *rx = container_of(napi, struct lan743x_rx, napi);
2190 	struct lan743x_adapter *adapter = rx->adapter;
2191 	int result = RX_PROCESS_RESULT_NOTHING_TO_DO;
2192 	u32 rx_tail_flags = 0;
2193 	int count;
2194 
2195 	if (rx->vector_flags & LAN743X_VECTOR_FLAG_SOURCE_STATUS_W2C) {
2196 		/* clear int status bit before reading packet */
2197 		lan743x_csr_write(adapter, DMAC_INT_STS,
2198 				  DMAC_INT_BIT_RXFRM_(rx->channel_number));
2199 	}
2200 	for (count = 0; count < weight; count++) {
2201 		result = lan743x_rx_process_buffer(rx);
2202 		if (result == RX_PROCESS_RESULT_NOTHING_TO_DO)
2203 			break;
2204 	}
2205 	rx->frame_count += count;
2206 	if (count == weight || result == RX_PROCESS_RESULT_BUFFER_RECEIVED)
2207 		return weight;
2208 
2209 	if (!napi_complete_done(napi, count))
2210 		return count;
2211 
2212 	/* re-arm interrupts, must write to rx tail on some chip variants */
2213 	if (rx->vector_flags & LAN743X_VECTOR_FLAG_VECTOR_ENABLE_AUTO_SET)
2214 		rx_tail_flags |= RX_TAIL_SET_TOP_INT_VEC_EN_;
2215 	if (rx->vector_flags & LAN743X_VECTOR_FLAG_SOURCE_ENABLE_AUTO_SET) {
2216 		rx_tail_flags |= RX_TAIL_SET_TOP_INT_EN_;
2217 	} else {
2218 		lan743x_csr_write(adapter, INT_EN_SET,
2219 				  INT_BIT_DMA_RX_(rx->channel_number));
2220 	}
2221 
2222 	if (rx_tail_flags)
2223 		lan743x_csr_write(adapter, RX_TAIL(rx->channel_number),
2224 				  rx_tail_flags | rx->last_tail);
2225 
2226 	return count;
2227 }
2228 
2229 static void lan743x_rx_ring_cleanup(struct lan743x_rx *rx)
2230 {
2231 	if (rx->buffer_info && rx->ring_cpu_ptr) {
2232 		int index;
2233 
2234 		for (index = 0; index < rx->ring_size; index++)
2235 			lan743x_rx_release_ring_element(rx, index);
2236 	}
2237 
2238 	if (rx->head_cpu_ptr) {
2239 		dma_free_coherent(&rx->adapter->pdev->dev,
2240 				  sizeof(*rx->head_cpu_ptr), rx->head_cpu_ptr,
2241 				  rx->head_dma_ptr);
2242 		rx->head_cpu_ptr = NULL;
2243 		rx->head_dma_ptr = 0;
2244 	}
2245 
2246 	kfree(rx->buffer_info);
2247 	rx->buffer_info = NULL;
2248 
2249 	if (rx->ring_cpu_ptr) {
2250 		dma_free_coherent(&rx->adapter->pdev->dev,
2251 				  rx->ring_allocation_size, rx->ring_cpu_ptr,
2252 				  rx->ring_dma_ptr);
2253 		rx->ring_allocation_size = 0;
2254 		rx->ring_cpu_ptr = NULL;
2255 		rx->ring_dma_ptr = 0;
2256 	}
2257 
2258 	rx->ring_size = 0;
2259 	rx->last_head = 0;
2260 }
2261 
2262 static int lan743x_rx_ring_init(struct lan743x_rx *rx)
2263 {
2264 	size_t ring_allocation_size = 0;
2265 	dma_addr_t dma_ptr = 0;
2266 	void *cpu_ptr = NULL;
2267 	int ret = -ENOMEM;
2268 	int index = 0;
2269 
2270 	rx->ring_size = LAN743X_RX_RING_SIZE;
2271 	if (rx->ring_size <= 1) {
2272 		ret = -EINVAL;
2273 		goto cleanup;
2274 	}
2275 	if (rx->ring_size & ~RX_CFG_B_RX_RING_LEN_MASK_) {
2276 		ret = -EINVAL;
2277 		goto cleanup;
2278 	}
2279 	ring_allocation_size = ALIGN(rx->ring_size *
2280 				     sizeof(struct lan743x_rx_descriptor),
2281 				     PAGE_SIZE);
2282 	dma_ptr = 0;
2283 	cpu_ptr = dma_alloc_coherent(&rx->adapter->pdev->dev,
2284 				     ring_allocation_size, &dma_ptr, GFP_KERNEL);
2285 	if (!cpu_ptr) {
2286 		ret = -ENOMEM;
2287 		goto cleanup;
2288 	}
2289 	rx->ring_allocation_size = ring_allocation_size;
2290 	rx->ring_cpu_ptr = (struct lan743x_rx_descriptor *)cpu_ptr;
2291 	rx->ring_dma_ptr = dma_ptr;
2292 
2293 	cpu_ptr = kcalloc(rx->ring_size, sizeof(*rx->buffer_info),
2294 			  GFP_KERNEL);
2295 	if (!cpu_ptr) {
2296 		ret = -ENOMEM;
2297 		goto cleanup;
2298 	}
2299 	rx->buffer_info = (struct lan743x_rx_buffer_info *)cpu_ptr;
2300 	dma_ptr = 0;
2301 	cpu_ptr = dma_alloc_coherent(&rx->adapter->pdev->dev,
2302 				     sizeof(*rx->head_cpu_ptr), &dma_ptr,
2303 				     GFP_KERNEL);
2304 	if (!cpu_ptr) {
2305 		ret = -ENOMEM;
2306 		goto cleanup;
2307 	}
2308 
2309 	rx->head_cpu_ptr = cpu_ptr;
2310 	rx->head_dma_ptr = dma_ptr;
2311 	if (rx->head_dma_ptr & 0x3) {
2312 		ret = -ENOMEM;
2313 		goto cleanup;
2314 	}
2315 
2316 	rx->last_head = 0;
2317 	for (index = 0; index < rx->ring_size; index++) {
2318 		ret = lan743x_rx_init_ring_element(rx, index);
2319 		if (ret)
2320 			goto cleanup;
2321 	}
2322 	return 0;
2323 
2324 cleanup:
2325 	lan743x_rx_ring_cleanup(rx);
2326 	return ret;
2327 }
2328 
2329 static void lan743x_rx_close(struct lan743x_rx *rx)
2330 {
2331 	struct lan743x_adapter *adapter = rx->adapter;
2332 
2333 	lan743x_csr_write(adapter, FCT_RX_CTL,
2334 			  FCT_RX_CTL_DIS_(rx->channel_number));
2335 	lan743x_csr_wait_for_bit(adapter, FCT_RX_CTL,
2336 				 FCT_RX_CTL_EN_(rx->channel_number),
2337 				 0, 1000, 20000, 100);
2338 
2339 	lan743x_csr_write(adapter, DMAC_CMD,
2340 			  DMAC_CMD_STOP_R_(rx->channel_number));
2341 	lan743x_dmac_rx_wait_till_stopped(adapter, rx->channel_number);
2342 
2343 	lan743x_csr_write(adapter, DMAC_INT_EN_CLR,
2344 			  DMAC_INT_BIT_RXFRM_(rx->channel_number));
2345 	lan743x_csr_write(adapter, INT_EN_CLR,
2346 			  INT_BIT_DMA_RX_(rx->channel_number));
2347 	napi_disable(&rx->napi);
2348 
2349 	netif_napi_del(&rx->napi);
2350 
2351 	lan743x_rx_ring_cleanup(rx);
2352 }
2353 
2354 static int lan743x_rx_open(struct lan743x_rx *rx)
2355 {
2356 	struct lan743x_adapter *adapter = rx->adapter;
2357 	u32 data = 0;
2358 	int ret;
2359 
2360 	rx->frame_count = 0;
2361 	ret = lan743x_rx_ring_init(rx);
2362 	if (ret)
2363 		goto return_error;
2364 
2365 	netif_napi_add(adapter->netdev,
2366 		       &rx->napi, lan743x_rx_napi_poll,
2367 		       NAPI_POLL_WEIGHT);
2368 
2369 	lan743x_csr_write(adapter, DMAC_CMD,
2370 			  DMAC_CMD_RX_SWR_(rx->channel_number));
2371 	lan743x_csr_wait_for_bit(adapter, DMAC_CMD,
2372 				 DMAC_CMD_RX_SWR_(rx->channel_number),
2373 				 0, 1000, 20000, 100);
2374 
2375 	/* set ring base address */
2376 	lan743x_csr_write(adapter,
2377 			  RX_BASE_ADDRH(rx->channel_number),
2378 			  DMA_ADDR_HIGH32(rx->ring_dma_ptr));
2379 	lan743x_csr_write(adapter,
2380 			  RX_BASE_ADDRL(rx->channel_number),
2381 			  DMA_ADDR_LOW32(rx->ring_dma_ptr));
2382 
2383 	/* set rx write back address */
2384 	lan743x_csr_write(adapter,
2385 			  RX_HEAD_WRITEBACK_ADDRH(rx->channel_number),
2386 			  DMA_ADDR_HIGH32(rx->head_dma_ptr));
2387 	lan743x_csr_write(adapter,
2388 			  RX_HEAD_WRITEBACK_ADDRL(rx->channel_number),
2389 			  DMA_ADDR_LOW32(rx->head_dma_ptr));
2390 	data = RX_CFG_A_RX_HP_WB_EN_;
2391 	if (!(adapter->csr.flags & LAN743X_CSR_FLAG_IS_A0)) {
2392 		data |= (RX_CFG_A_RX_WB_ON_INT_TMR_ |
2393 			RX_CFG_A_RX_WB_THRES_SET_(0x7) |
2394 			RX_CFG_A_RX_PF_THRES_SET_(16) |
2395 			RX_CFG_A_RX_PF_PRI_THRES_SET_(4));
2396 	}
2397 
2398 	/* set RX_CFG_A */
2399 	lan743x_csr_write(adapter,
2400 			  RX_CFG_A(rx->channel_number), data);
2401 
2402 	/* set RX_CFG_B */
2403 	data = lan743x_csr_read(adapter, RX_CFG_B(rx->channel_number));
2404 	data &= ~RX_CFG_B_RX_PAD_MASK_;
2405 	if (!RX_HEAD_PADDING)
2406 		data |= RX_CFG_B_RX_PAD_0_;
2407 	else
2408 		data |= RX_CFG_B_RX_PAD_2_;
2409 	data &= ~RX_CFG_B_RX_RING_LEN_MASK_;
2410 	data |= ((rx->ring_size) & RX_CFG_B_RX_RING_LEN_MASK_);
2411 	data |= RX_CFG_B_TS_ALL_RX_;
2412 	if (!(adapter->csr.flags & LAN743X_CSR_FLAG_IS_A0))
2413 		data |= RX_CFG_B_RDMABL_512_;
2414 
2415 	lan743x_csr_write(adapter, RX_CFG_B(rx->channel_number), data);
2416 	rx->vector_flags = lan743x_intr_get_vector_flags(adapter,
2417 							 INT_BIT_DMA_RX_
2418 							 (rx->channel_number));
2419 
2420 	/* set RX_CFG_C */
2421 	data = 0;
2422 	if (rx->vector_flags & LAN743X_VECTOR_FLAG_SOURCE_ENABLE_AUTO_CLEAR)
2423 		data |= RX_CFG_C_RX_TOP_INT_EN_AUTO_CLR_;
2424 	if (rx->vector_flags & LAN743X_VECTOR_FLAG_SOURCE_STATUS_AUTO_CLEAR)
2425 		data |= RX_CFG_C_RX_DMA_INT_STS_AUTO_CLR_;
2426 	if (rx->vector_flags & LAN743X_VECTOR_FLAG_SOURCE_STATUS_R2C)
2427 		data |= RX_CFG_C_RX_INT_STS_R2C_MODE_MASK_;
2428 	if (rx->vector_flags & LAN743X_VECTOR_FLAG_SOURCE_ENABLE_R2C)
2429 		data |= RX_CFG_C_RX_INT_EN_R2C_;
2430 	lan743x_csr_write(adapter, RX_CFG_C(rx->channel_number), data);
2431 
2432 	rx->last_tail = ((u32)(rx->ring_size - 1));
2433 	lan743x_csr_write(adapter, RX_TAIL(rx->channel_number),
2434 			  rx->last_tail);
2435 	rx->last_head = lan743x_csr_read(adapter, RX_HEAD(rx->channel_number));
2436 	if (rx->last_head) {
2437 		ret = -EIO;
2438 		goto napi_delete;
2439 	}
2440 
2441 	napi_enable(&rx->napi);
2442 
2443 	lan743x_csr_write(adapter, INT_EN_SET,
2444 			  INT_BIT_DMA_RX_(rx->channel_number));
2445 	lan743x_csr_write(adapter, DMAC_INT_STS,
2446 			  DMAC_INT_BIT_RXFRM_(rx->channel_number));
2447 	lan743x_csr_write(adapter, DMAC_INT_EN_SET,
2448 			  DMAC_INT_BIT_RXFRM_(rx->channel_number));
2449 	lan743x_csr_write(adapter, DMAC_CMD,
2450 			  DMAC_CMD_START_R_(rx->channel_number));
2451 
2452 	/* initialize fifo */
2453 	lan743x_csr_write(adapter, FCT_RX_CTL,
2454 			  FCT_RX_CTL_RESET_(rx->channel_number));
2455 	lan743x_csr_wait_for_bit(adapter, FCT_RX_CTL,
2456 				 FCT_RX_CTL_RESET_(rx->channel_number),
2457 				 0, 1000, 20000, 100);
2458 	lan743x_csr_write(adapter, FCT_FLOW(rx->channel_number),
2459 			  FCT_FLOW_CTL_REQ_EN_ |
2460 			  FCT_FLOW_CTL_ON_THRESHOLD_SET_(0x2A) |
2461 			  FCT_FLOW_CTL_OFF_THRESHOLD_SET_(0xA));
2462 
2463 	/* enable fifo */
2464 	lan743x_csr_write(adapter, FCT_RX_CTL,
2465 			  FCT_RX_CTL_EN_(rx->channel_number));
2466 	return 0;
2467 
2468 napi_delete:
2469 	netif_napi_del(&rx->napi);
2470 	lan743x_rx_ring_cleanup(rx);
2471 
2472 return_error:
2473 	return ret;
2474 }
2475 
2476 static int lan743x_netdev_close(struct net_device *netdev)
2477 {
2478 	struct lan743x_adapter *adapter = netdev_priv(netdev);
2479 	int index;
2480 
2481 	lan743x_tx_close(&adapter->tx[0]);
2482 
2483 	for (index = 0; index < LAN743X_USED_RX_CHANNELS; index++)
2484 		lan743x_rx_close(&adapter->rx[index]);
2485 
2486 	lan743x_ptp_close(adapter);
2487 
2488 	lan743x_phy_close(adapter);
2489 
2490 	lan743x_mac_close(adapter);
2491 
2492 	lan743x_intr_close(adapter);
2493 
2494 	return 0;
2495 }
2496 
2497 static int lan743x_netdev_open(struct net_device *netdev)
2498 {
2499 	struct lan743x_adapter *adapter = netdev_priv(netdev);
2500 	int index;
2501 	int ret;
2502 
2503 	ret = lan743x_intr_open(adapter);
2504 	if (ret)
2505 		goto return_error;
2506 
2507 	ret = lan743x_mac_open(adapter);
2508 	if (ret)
2509 		goto close_intr;
2510 
2511 	ret = lan743x_phy_open(adapter);
2512 	if (ret)
2513 		goto close_mac;
2514 
2515 	ret = lan743x_ptp_open(adapter);
2516 	if (ret)
2517 		goto close_phy;
2518 
2519 	lan743x_rfe_open(adapter);
2520 
2521 	for (index = 0; index < LAN743X_USED_RX_CHANNELS; index++) {
2522 		ret = lan743x_rx_open(&adapter->rx[index]);
2523 		if (ret)
2524 			goto close_rx;
2525 	}
2526 
2527 	ret = lan743x_tx_open(&adapter->tx[0]);
2528 	if (ret)
2529 		goto close_rx;
2530 
2531 	return 0;
2532 
2533 close_rx:
2534 	for (index = 0; index < LAN743X_USED_RX_CHANNELS; index++) {
2535 		if (adapter->rx[index].ring_cpu_ptr)
2536 			lan743x_rx_close(&adapter->rx[index]);
2537 	}
2538 	lan743x_ptp_close(adapter);
2539 
2540 close_phy:
2541 	lan743x_phy_close(adapter);
2542 
2543 close_mac:
2544 	lan743x_mac_close(adapter);
2545 
2546 close_intr:
2547 	lan743x_intr_close(adapter);
2548 
2549 return_error:
2550 	netif_warn(adapter, ifup, adapter->netdev,
2551 		   "Error opening LAN743x\n");
2552 	return ret;
2553 }
2554 
2555 static netdev_tx_t lan743x_netdev_xmit_frame(struct sk_buff *skb,
2556 					     struct net_device *netdev)
2557 {
2558 	struct lan743x_adapter *adapter = netdev_priv(netdev);
2559 
2560 	return lan743x_tx_xmit_frame(&adapter->tx[0], skb);
2561 }
2562 
2563 static int lan743x_netdev_ioctl(struct net_device *netdev,
2564 				struct ifreq *ifr, int cmd)
2565 {
2566 	if (!netif_running(netdev))
2567 		return -EINVAL;
2568 	if (cmd == SIOCSHWTSTAMP)
2569 		return lan743x_ptp_ioctl(netdev, ifr, cmd);
2570 	return phy_mii_ioctl(netdev->phydev, ifr, cmd);
2571 }
2572 
2573 static void lan743x_netdev_set_multicast(struct net_device *netdev)
2574 {
2575 	struct lan743x_adapter *adapter = netdev_priv(netdev);
2576 
2577 	lan743x_rfe_set_multicast(adapter);
2578 }
2579 
2580 static int lan743x_netdev_change_mtu(struct net_device *netdev, int new_mtu)
2581 {
2582 	struct lan743x_adapter *adapter = netdev_priv(netdev);
2583 	int ret = 0;
2584 
2585 	ret = lan743x_mac_set_mtu(adapter, new_mtu);
2586 	if (!ret)
2587 		netdev->mtu = new_mtu;
2588 	return ret;
2589 }
2590 
2591 static void lan743x_netdev_get_stats64(struct net_device *netdev,
2592 				       struct rtnl_link_stats64 *stats)
2593 {
2594 	struct lan743x_adapter *adapter = netdev_priv(netdev);
2595 
2596 	stats->rx_packets = lan743x_csr_read(adapter, STAT_RX_TOTAL_FRAMES);
2597 	stats->tx_packets = lan743x_csr_read(adapter, STAT_TX_TOTAL_FRAMES);
2598 	stats->rx_bytes = lan743x_csr_read(adapter,
2599 					   STAT_RX_UNICAST_BYTE_COUNT) +
2600 			  lan743x_csr_read(adapter,
2601 					   STAT_RX_BROADCAST_BYTE_COUNT) +
2602 			  lan743x_csr_read(adapter,
2603 					   STAT_RX_MULTICAST_BYTE_COUNT);
2604 	stats->tx_bytes = lan743x_csr_read(adapter,
2605 					   STAT_TX_UNICAST_BYTE_COUNT) +
2606 			  lan743x_csr_read(adapter,
2607 					   STAT_TX_BROADCAST_BYTE_COUNT) +
2608 			  lan743x_csr_read(adapter,
2609 					   STAT_TX_MULTICAST_BYTE_COUNT);
2610 	stats->rx_errors = lan743x_csr_read(adapter, STAT_RX_FCS_ERRORS) +
2611 			   lan743x_csr_read(adapter,
2612 					    STAT_RX_ALIGNMENT_ERRORS) +
2613 			   lan743x_csr_read(adapter, STAT_RX_JABBER_ERRORS) +
2614 			   lan743x_csr_read(adapter,
2615 					    STAT_RX_UNDERSIZE_FRAME_ERRORS) +
2616 			   lan743x_csr_read(adapter,
2617 					    STAT_RX_OVERSIZE_FRAME_ERRORS);
2618 	stats->tx_errors = lan743x_csr_read(adapter, STAT_TX_FCS_ERRORS) +
2619 			   lan743x_csr_read(adapter,
2620 					    STAT_TX_EXCESS_DEFERRAL_ERRORS) +
2621 			   lan743x_csr_read(adapter, STAT_TX_CARRIER_ERRORS);
2622 	stats->rx_dropped = lan743x_csr_read(adapter,
2623 					     STAT_RX_DROPPED_FRAMES);
2624 	stats->tx_dropped = lan743x_csr_read(adapter,
2625 					     STAT_TX_EXCESSIVE_COLLISION);
2626 	stats->multicast = lan743x_csr_read(adapter,
2627 					    STAT_RX_MULTICAST_FRAMES) +
2628 			   lan743x_csr_read(adapter,
2629 					    STAT_TX_MULTICAST_FRAMES);
2630 	stats->collisions = lan743x_csr_read(adapter,
2631 					     STAT_TX_SINGLE_COLLISIONS) +
2632 			    lan743x_csr_read(adapter,
2633 					     STAT_TX_MULTIPLE_COLLISIONS) +
2634 			    lan743x_csr_read(adapter,
2635 					     STAT_TX_LATE_COLLISIONS);
2636 }
2637 
2638 static int lan743x_netdev_set_mac_address(struct net_device *netdev,
2639 					  void *addr)
2640 {
2641 	struct lan743x_adapter *adapter = netdev_priv(netdev);
2642 	struct sockaddr *sock_addr = addr;
2643 	int ret;
2644 
2645 	ret = eth_prepare_mac_addr_change(netdev, sock_addr);
2646 	if (ret)
2647 		return ret;
2648 	ether_addr_copy(netdev->dev_addr, sock_addr->sa_data);
2649 	lan743x_mac_set_address(adapter, sock_addr->sa_data);
2650 	lan743x_rfe_update_mac_address(adapter);
2651 	return 0;
2652 }
2653 
2654 static const struct net_device_ops lan743x_netdev_ops = {
2655 	.ndo_open		= lan743x_netdev_open,
2656 	.ndo_stop		= lan743x_netdev_close,
2657 	.ndo_start_xmit		= lan743x_netdev_xmit_frame,
2658 	.ndo_do_ioctl		= lan743x_netdev_ioctl,
2659 	.ndo_set_rx_mode	= lan743x_netdev_set_multicast,
2660 	.ndo_change_mtu		= lan743x_netdev_change_mtu,
2661 	.ndo_get_stats64	= lan743x_netdev_get_stats64,
2662 	.ndo_set_mac_address	= lan743x_netdev_set_mac_address,
2663 };
2664 
2665 static void lan743x_hardware_cleanup(struct lan743x_adapter *adapter)
2666 {
2667 	lan743x_csr_write(adapter, INT_EN_CLR, 0xFFFFFFFF);
2668 }
2669 
2670 static void lan743x_mdiobus_cleanup(struct lan743x_adapter *adapter)
2671 {
2672 	mdiobus_unregister(adapter->mdiobus);
2673 }
2674 
2675 static void lan743x_full_cleanup(struct lan743x_adapter *adapter)
2676 {
2677 	unregister_netdev(adapter->netdev);
2678 
2679 	lan743x_mdiobus_cleanup(adapter);
2680 	lan743x_hardware_cleanup(adapter);
2681 	lan743x_pci_cleanup(adapter);
2682 }
2683 
2684 static int lan743x_hardware_init(struct lan743x_adapter *adapter,
2685 				 struct pci_dev *pdev)
2686 {
2687 	struct lan743x_tx *tx;
2688 	int index;
2689 	int ret;
2690 
2691 	adapter->intr.irq = adapter->pdev->irq;
2692 	lan743x_csr_write(adapter, INT_EN_CLR, 0xFFFFFFFF);
2693 
2694 	ret = lan743x_gpio_init(adapter);
2695 	if (ret)
2696 		return ret;
2697 
2698 	ret = lan743x_mac_init(adapter);
2699 	if (ret)
2700 		return ret;
2701 
2702 	ret = lan743x_phy_init(adapter);
2703 	if (ret)
2704 		return ret;
2705 
2706 	ret = lan743x_ptp_init(adapter);
2707 	if (ret)
2708 		return ret;
2709 
2710 	lan743x_rfe_update_mac_address(adapter);
2711 
2712 	ret = lan743x_dmac_init(adapter);
2713 	if (ret)
2714 		return ret;
2715 
2716 	for (index = 0; index < LAN743X_USED_RX_CHANNELS; index++) {
2717 		adapter->rx[index].adapter = adapter;
2718 		adapter->rx[index].channel_number = index;
2719 	}
2720 
2721 	tx = &adapter->tx[0];
2722 	tx->adapter = adapter;
2723 	tx->channel_number = 0;
2724 	spin_lock_init(&tx->ring_lock);
2725 	return 0;
2726 }
2727 
2728 static int lan743x_mdiobus_init(struct lan743x_adapter *adapter)
2729 {
2730 	int ret;
2731 
2732 	adapter->mdiobus = devm_mdiobus_alloc(&adapter->pdev->dev);
2733 	if (!(adapter->mdiobus)) {
2734 		ret = -ENOMEM;
2735 		goto return_error;
2736 	}
2737 
2738 	adapter->mdiobus->priv = (void *)adapter;
2739 	adapter->mdiobus->read = lan743x_mdiobus_read;
2740 	adapter->mdiobus->write = lan743x_mdiobus_write;
2741 	adapter->mdiobus->name = "lan743x-mdiobus";
2742 	snprintf(adapter->mdiobus->id, MII_BUS_ID_SIZE,
2743 		 "pci-%s", pci_name(adapter->pdev));
2744 
2745 	if ((adapter->csr.id_rev & ID_REV_ID_MASK_) == ID_REV_ID_LAN7430_)
2746 		/* LAN7430 uses internal phy at address 1 */
2747 		adapter->mdiobus->phy_mask = ~(u32)BIT(1);
2748 
2749 	/* register mdiobus */
2750 	ret = mdiobus_register(adapter->mdiobus);
2751 	if (ret < 0)
2752 		goto return_error;
2753 	return 0;
2754 
2755 return_error:
2756 	return ret;
2757 }
2758 
2759 /* lan743x_pcidev_probe - Device Initialization Routine
2760  * @pdev: PCI device information struct
2761  * @id: entry in lan743x_pci_tbl
2762  *
2763  * Returns 0 on success, negative on failure
2764  *
2765  * initializes an adapter identified by a pci_dev structure.
2766  * The OS initialization, configuring of the adapter private structure,
2767  * and a hardware reset occur.
2768  **/
2769 static int lan743x_pcidev_probe(struct pci_dev *pdev,
2770 				const struct pci_device_id *id)
2771 {
2772 	struct lan743x_adapter *adapter = NULL;
2773 	struct net_device *netdev = NULL;
2774 	int ret = -ENODEV;
2775 
2776 	netdev = devm_alloc_etherdev(&pdev->dev,
2777 				     sizeof(struct lan743x_adapter));
2778 	if (!netdev)
2779 		goto return_error;
2780 
2781 	SET_NETDEV_DEV(netdev, &pdev->dev);
2782 	pci_set_drvdata(pdev, netdev);
2783 	adapter = netdev_priv(netdev);
2784 	adapter->netdev = netdev;
2785 	adapter->msg_enable = NETIF_MSG_DRV | NETIF_MSG_PROBE |
2786 			      NETIF_MSG_LINK | NETIF_MSG_IFUP |
2787 			      NETIF_MSG_IFDOWN | NETIF_MSG_TX_QUEUED;
2788 	netdev->max_mtu = LAN743X_MAX_FRAME_SIZE;
2789 
2790 	of_get_mac_address(pdev->dev.of_node, adapter->mac_address);
2791 
2792 	ret = lan743x_pci_init(adapter, pdev);
2793 	if (ret)
2794 		goto return_error;
2795 
2796 	ret = lan743x_csr_init(adapter);
2797 	if (ret)
2798 		goto cleanup_pci;
2799 
2800 	ret = lan743x_hardware_init(adapter, pdev);
2801 	if (ret)
2802 		goto cleanup_pci;
2803 
2804 	ret = lan743x_mdiobus_init(adapter);
2805 	if (ret)
2806 		goto cleanup_hardware;
2807 
2808 	adapter->netdev->netdev_ops = &lan743x_netdev_ops;
2809 	adapter->netdev->ethtool_ops = &lan743x_ethtool_ops;
2810 	adapter->netdev->features = NETIF_F_SG | NETIF_F_TSO | NETIF_F_HW_CSUM;
2811 	adapter->netdev->hw_features = adapter->netdev->features;
2812 
2813 	/* carrier off reporting is important to ethtool even BEFORE open */
2814 	netif_carrier_off(netdev);
2815 
2816 	ret = register_netdev(adapter->netdev);
2817 	if (ret < 0)
2818 		goto cleanup_mdiobus;
2819 	return 0;
2820 
2821 cleanup_mdiobus:
2822 	lan743x_mdiobus_cleanup(adapter);
2823 
2824 cleanup_hardware:
2825 	lan743x_hardware_cleanup(adapter);
2826 
2827 cleanup_pci:
2828 	lan743x_pci_cleanup(adapter);
2829 
2830 return_error:
2831 	pr_warn("Initialization failed\n");
2832 	return ret;
2833 }
2834 
2835 /**
2836  * lan743x_pcidev_remove - Device Removal Routine
2837  * @pdev: PCI device information struct
2838  *
2839  * this is called by the PCI subsystem to alert the driver
2840  * that it should release a PCI device.  This could be caused by a
2841  * Hot-Plug event, or because the driver is going to be removed from
2842  * memory.
2843  **/
2844 static void lan743x_pcidev_remove(struct pci_dev *pdev)
2845 {
2846 	struct net_device *netdev = pci_get_drvdata(pdev);
2847 	struct lan743x_adapter *adapter = netdev_priv(netdev);
2848 
2849 	lan743x_full_cleanup(adapter);
2850 }
2851 
2852 static void lan743x_pcidev_shutdown(struct pci_dev *pdev)
2853 {
2854 	struct net_device *netdev = pci_get_drvdata(pdev);
2855 	struct lan743x_adapter *adapter = netdev_priv(netdev);
2856 
2857 	rtnl_lock();
2858 	netif_device_detach(netdev);
2859 
2860 	/* close netdev when netdev is at running state.
2861 	 * For instance, it is true when system goes to sleep by pm-suspend
2862 	 * However, it is false when system goes to sleep by suspend GUI menu
2863 	 */
2864 	if (netif_running(netdev))
2865 		lan743x_netdev_close(netdev);
2866 	rtnl_unlock();
2867 
2868 #ifdef CONFIG_PM
2869 	pci_save_state(pdev);
2870 #endif
2871 
2872 	/* clean up lan743x portion */
2873 	lan743x_hardware_cleanup(adapter);
2874 }
2875 
2876 #ifdef CONFIG_PM_SLEEP
2877 static u16 lan743x_pm_wakeframe_crc16(const u8 *buf, int len)
2878 {
2879 	return bitrev16(crc16(0xFFFF, buf, len));
2880 }
2881 
2882 static void lan743x_pm_set_wol(struct lan743x_adapter *adapter)
2883 {
2884 	const u8 ipv4_multicast[3] = { 0x01, 0x00, 0x5E };
2885 	const u8 ipv6_multicast[3] = { 0x33, 0x33 };
2886 	const u8 arp_type[2] = { 0x08, 0x06 };
2887 	int mask_index;
2888 	u32 pmtctl;
2889 	u32 wucsr;
2890 	u32 macrx;
2891 	u16 crc;
2892 
2893 	for (mask_index = 0; mask_index < MAC_NUM_OF_WUF_CFG; mask_index++)
2894 		lan743x_csr_write(adapter, MAC_WUF_CFG(mask_index), 0);
2895 
2896 	/* clear wake settings */
2897 	pmtctl = lan743x_csr_read(adapter, PMT_CTL);
2898 	pmtctl |= PMT_CTL_WUPS_MASK_;
2899 	pmtctl &= ~(PMT_CTL_GPIO_WAKEUP_EN_ | PMT_CTL_EEE_WAKEUP_EN_ |
2900 		PMT_CTL_WOL_EN_ | PMT_CTL_MAC_D3_RX_CLK_OVR_ |
2901 		PMT_CTL_RX_FCT_RFE_D3_CLK_OVR_ | PMT_CTL_ETH_PHY_WAKE_EN_);
2902 
2903 	macrx = lan743x_csr_read(adapter, MAC_RX);
2904 
2905 	wucsr = 0;
2906 	mask_index = 0;
2907 
2908 	pmtctl |= PMT_CTL_ETH_PHY_D3_COLD_OVR_ | PMT_CTL_ETH_PHY_D3_OVR_;
2909 
2910 	if (adapter->wolopts & WAKE_PHY) {
2911 		pmtctl |= PMT_CTL_ETH_PHY_EDPD_PLL_CTL_;
2912 		pmtctl |= PMT_CTL_ETH_PHY_WAKE_EN_;
2913 	}
2914 	if (adapter->wolopts & WAKE_MAGIC) {
2915 		wucsr |= MAC_WUCSR_MPEN_;
2916 		macrx |= MAC_RX_RXEN_;
2917 		pmtctl |= PMT_CTL_WOL_EN_ | PMT_CTL_MAC_D3_RX_CLK_OVR_;
2918 	}
2919 	if (adapter->wolopts & WAKE_UCAST) {
2920 		wucsr |= MAC_WUCSR_RFE_WAKE_EN_ | MAC_WUCSR_PFDA_EN_;
2921 		macrx |= MAC_RX_RXEN_;
2922 		pmtctl |= PMT_CTL_WOL_EN_ | PMT_CTL_MAC_D3_RX_CLK_OVR_;
2923 		pmtctl |= PMT_CTL_RX_FCT_RFE_D3_CLK_OVR_;
2924 	}
2925 	if (adapter->wolopts & WAKE_BCAST) {
2926 		wucsr |= MAC_WUCSR_RFE_WAKE_EN_ | MAC_WUCSR_BCST_EN_;
2927 		macrx |= MAC_RX_RXEN_;
2928 		pmtctl |= PMT_CTL_WOL_EN_ | PMT_CTL_MAC_D3_RX_CLK_OVR_;
2929 		pmtctl |= PMT_CTL_RX_FCT_RFE_D3_CLK_OVR_;
2930 	}
2931 	if (adapter->wolopts & WAKE_MCAST) {
2932 		/* IPv4 multicast */
2933 		crc = lan743x_pm_wakeframe_crc16(ipv4_multicast, 3);
2934 		lan743x_csr_write(adapter, MAC_WUF_CFG(mask_index),
2935 				  MAC_WUF_CFG_EN_ | MAC_WUF_CFG_TYPE_MCAST_ |
2936 				  (0 << MAC_WUF_CFG_OFFSET_SHIFT_) |
2937 				  (crc & MAC_WUF_CFG_CRC16_MASK_));
2938 		lan743x_csr_write(adapter, MAC_WUF_MASK0(mask_index), 7);
2939 		lan743x_csr_write(adapter, MAC_WUF_MASK1(mask_index), 0);
2940 		lan743x_csr_write(adapter, MAC_WUF_MASK2(mask_index), 0);
2941 		lan743x_csr_write(adapter, MAC_WUF_MASK3(mask_index), 0);
2942 		mask_index++;
2943 
2944 		/* IPv6 multicast */
2945 		crc = lan743x_pm_wakeframe_crc16(ipv6_multicast, 2);
2946 		lan743x_csr_write(adapter, MAC_WUF_CFG(mask_index),
2947 				  MAC_WUF_CFG_EN_ | MAC_WUF_CFG_TYPE_MCAST_ |
2948 				  (0 << MAC_WUF_CFG_OFFSET_SHIFT_) |
2949 				  (crc & MAC_WUF_CFG_CRC16_MASK_));
2950 		lan743x_csr_write(adapter, MAC_WUF_MASK0(mask_index), 3);
2951 		lan743x_csr_write(adapter, MAC_WUF_MASK1(mask_index), 0);
2952 		lan743x_csr_write(adapter, MAC_WUF_MASK2(mask_index), 0);
2953 		lan743x_csr_write(adapter, MAC_WUF_MASK3(mask_index), 0);
2954 		mask_index++;
2955 
2956 		wucsr |= MAC_WUCSR_RFE_WAKE_EN_ | MAC_WUCSR_WAKE_EN_;
2957 		macrx |= MAC_RX_RXEN_;
2958 		pmtctl |= PMT_CTL_WOL_EN_ | PMT_CTL_MAC_D3_RX_CLK_OVR_;
2959 		pmtctl |= PMT_CTL_RX_FCT_RFE_D3_CLK_OVR_;
2960 	}
2961 	if (adapter->wolopts & WAKE_ARP) {
2962 		/* set MAC_WUF_CFG & WUF_MASK
2963 		 * for packettype (offset 12,13) = ARP (0x0806)
2964 		 */
2965 		crc = lan743x_pm_wakeframe_crc16(arp_type, 2);
2966 		lan743x_csr_write(adapter, MAC_WUF_CFG(mask_index),
2967 				  MAC_WUF_CFG_EN_ | MAC_WUF_CFG_TYPE_ALL_ |
2968 				  (0 << MAC_WUF_CFG_OFFSET_SHIFT_) |
2969 				  (crc & MAC_WUF_CFG_CRC16_MASK_));
2970 		lan743x_csr_write(adapter, MAC_WUF_MASK0(mask_index), 0x3000);
2971 		lan743x_csr_write(adapter, MAC_WUF_MASK1(mask_index), 0);
2972 		lan743x_csr_write(adapter, MAC_WUF_MASK2(mask_index), 0);
2973 		lan743x_csr_write(adapter, MAC_WUF_MASK3(mask_index), 0);
2974 		mask_index++;
2975 
2976 		wucsr |= MAC_WUCSR_RFE_WAKE_EN_ | MAC_WUCSR_WAKE_EN_;
2977 		macrx |= MAC_RX_RXEN_;
2978 		pmtctl |= PMT_CTL_WOL_EN_ | PMT_CTL_MAC_D3_RX_CLK_OVR_;
2979 		pmtctl |= PMT_CTL_RX_FCT_RFE_D3_CLK_OVR_;
2980 	}
2981 
2982 	lan743x_csr_write(adapter, MAC_WUCSR, wucsr);
2983 	lan743x_csr_write(adapter, PMT_CTL, pmtctl);
2984 	lan743x_csr_write(adapter, MAC_RX, macrx);
2985 }
2986 
2987 static int lan743x_pm_suspend(struct device *dev)
2988 {
2989 	struct pci_dev *pdev = to_pci_dev(dev);
2990 	struct net_device *netdev = pci_get_drvdata(pdev);
2991 	struct lan743x_adapter *adapter = netdev_priv(netdev);
2992 
2993 	lan743x_pcidev_shutdown(pdev);
2994 
2995 	/* clear all wakes */
2996 	lan743x_csr_write(adapter, MAC_WUCSR, 0);
2997 	lan743x_csr_write(adapter, MAC_WUCSR2, 0);
2998 	lan743x_csr_write(adapter, MAC_WK_SRC, 0xFFFFFFFF);
2999 
3000 	if (adapter->wolopts)
3001 		lan743x_pm_set_wol(adapter);
3002 
3003 	/* Host sets PME_En, put D3hot */
3004 	return pci_prepare_to_sleep(pdev);
3005 }
3006 
3007 static int lan743x_pm_resume(struct device *dev)
3008 {
3009 	struct pci_dev *pdev = to_pci_dev(dev);
3010 	struct net_device *netdev = pci_get_drvdata(pdev);
3011 	struct lan743x_adapter *adapter = netdev_priv(netdev);
3012 	int ret;
3013 
3014 	pci_set_power_state(pdev, PCI_D0);
3015 	pci_restore_state(pdev);
3016 	pci_save_state(pdev);
3017 
3018 	ret = lan743x_hardware_init(adapter, pdev);
3019 	if (ret) {
3020 		netif_err(adapter, probe, adapter->netdev,
3021 			  "lan743x_hardware_init returned %d\n", ret);
3022 	}
3023 
3024 	/* open netdev when netdev is at running state while resume.
3025 	 * For instance, it is true when system wakesup after pm-suspend
3026 	 * However, it is false when system wakes up after suspend GUI menu
3027 	 */
3028 	if (netif_running(netdev))
3029 		lan743x_netdev_open(netdev);
3030 
3031 	netif_device_attach(netdev);
3032 
3033 	return 0;
3034 }
3035 
3036 static const struct dev_pm_ops lan743x_pm_ops = {
3037 	SET_SYSTEM_SLEEP_PM_OPS(lan743x_pm_suspend, lan743x_pm_resume)
3038 };
3039 #endif /* CONFIG_PM_SLEEP */
3040 
3041 static const struct pci_device_id lan743x_pcidev_tbl[] = {
3042 	{ PCI_DEVICE(PCI_VENDOR_ID_SMSC, PCI_DEVICE_ID_SMSC_LAN7430) },
3043 	{ PCI_DEVICE(PCI_VENDOR_ID_SMSC, PCI_DEVICE_ID_SMSC_LAN7431) },
3044 	{ 0, }
3045 };
3046 
3047 MODULE_DEVICE_TABLE(pci, lan743x_pcidev_tbl);
3048 
3049 static struct pci_driver lan743x_pcidev_driver = {
3050 	.name     = DRIVER_NAME,
3051 	.id_table = lan743x_pcidev_tbl,
3052 	.probe    = lan743x_pcidev_probe,
3053 	.remove   = lan743x_pcidev_remove,
3054 #ifdef CONFIG_PM_SLEEP
3055 	.driver.pm = &lan743x_pm_ops,
3056 #endif
3057 	.shutdown = lan743x_pcidev_shutdown,
3058 };
3059 
3060 module_pci_driver(lan743x_pcidev_driver);
3061 
3062 MODULE_AUTHOR(DRIVER_AUTHOR);
3063 MODULE_DESCRIPTION(DRIVER_DESC);
3064 MODULE_LICENSE("GPL");
3065