1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Xilinx Axi Ethernet device driver
4 *
5 * Copyright (c) 2008 Nissin Systems Co., Ltd., Yoshio Kashiwagi
6 * Copyright (c) 2005-2008 DLA Systems, David H. Lynch Jr. <dhlii@dlasys.net>
7 * Copyright (c) 2008-2009 Secret Lab Technologies Ltd.
8 * Copyright (c) 2010 - 2011 Michal Simek <monstr@monstr.eu>
9 * Copyright (c) 2010 - 2011 PetaLogix
10 * Copyright (c) 2019 - 2022 Calian Advanced Technologies
11 * Copyright (c) 2010 - 2012 Xilinx, Inc. All rights reserved.
12 *
13 * This is a driver for the Xilinx Axi Ethernet which is used in the Virtex6
14 * and Spartan6.
15 *
16 * TODO:
17 * - Add Axi Fifo support.
18 * - Factor out Axi DMA code into separate driver.
19 * - Test and fix basic multicast filtering.
20 * - Add support for extended multicast filtering.
21 * - Test basic VLAN support.
22 * - Add support for extended VLAN support.
23 */
24
25#include <linux/clk.h>
26#include <linux/delay.h>
27#include <linux/etherdevice.h>
28#include <linux/module.h>
29#include <linux/netdevice.h>
30#include <linux/of.h>
31#include <linux/of_mdio.h>
32#include <linux/of_net.h>
33#include <linux/of_irq.h>
34#include <linux/of_address.h>
35#include <linux/platform_device.h>
36#include <linux/skbuff.h>
37#include <linux/math64.h>
38#include <linux/phy.h>
39#include <linux/mii.h>
40#include <linux/ethtool.h>
41
42#include "xilinx_axienet.h"
43
44/* Descriptors defines for Tx and Rx DMA */
45#define TX_BD_NUM_DEFAULT 128
46#define RX_BD_NUM_DEFAULT 1024
47#define TX_BD_NUM_MIN (MAX_SKB_FRAGS + 1)
48#define TX_BD_NUM_MAX 4096
49#define RX_BD_NUM_MAX 4096
50
51/* Must be shorter than length of ethtool_drvinfo.driver field to fit */
52#define DRIVER_NAME "xaxienet"
53#define DRIVER_DESCRIPTION "Xilinx Axi Ethernet driver"
54#define DRIVER_VERSION "1.00a"
55
56#define AXIENET_REGS_N 40
57
58/* Match table for of_platform binding */
59static const struct of_device_id axienet_of_match[] = {
60 { .compatible = "xlnx,axi-ethernet-1.00.a", },
61 { .compatible = "xlnx,axi-ethernet-1.01.a", },
62 { .compatible = "xlnx,axi-ethernet-2.01.a", },
63 {},
64};
65
66MODULE_DEVICE_TABLE(of, axienet_of_match);
67
68/* Option table for setting up Axi Ethernet hardware options */
69static struct axienet_option axienet_options[] = {
70 /* Turn on jumbo packet support for both Rx and Tx */
71 {
72 .opt = XAE_OPTION_JUMBO,
73 .reg = XAE_TC_OFFSET,
74 .m_or = XAE_TC_JUM_MASK,
75 }, {
76 .opt = XAE_OPTION_JUMBO,
77 .reg = XAE_RCW1_OFFSET,
78 .m_or = XAE_RCW1_JUM_MASK,
79 }, { /* Turn on VLAN packet support for both Rx and Tx */
80 .opt = XAE_OPTION_VLAN,
81 .reg = XAE_TC_OFFSET,
82 .m_or = XAE_TC_VLAN_MASK,
83 }, {
84 .opt = XAE_OPTION_VLAN,
85 .reg = XAE_RCW1_OFFSET,
86 .m_or = XAE_RCW1_VLAN_MASK,
87 }, { /* Turn on FCS stripping on receive packets */
88 .opt = XAE_OPTION_FCS_STRIP,
89 .reg = XAE_RCW1_OFFSET,
90 .m_or = XAE_RCW1_FCS_MASK,
91 }, { /* Turn on FCS insertion on transmit packets */
92 .opt = XAE_OPTION_FCS_INSERT,
93 .reg = XAE_TC_OFFSET,
94 .m_or = XAE_TC_FCS_MASK,
95 }, { /* Turn off length/type field checking on receive packets */
96 .opt = XAE_OPTION_LENTYPE_ERR,
97 .reg = XAE_RCW1_OFFSET,
98 .m_or = XAE_RCW1_LT_DIS_MASK,
99 }, { /* Turn on Rx flow control */
100 .opt = XAE_OPTION_FLOW_CONTROL,
101 .reg = XAE_FCC_OFFSET,
102 .m_or = XAE_FCC_FCRX_MASK,
103 }, { /* Turn on Tx flow control */
104 .opt = XAE_OPTION_FLOW_CONTROL,
105 .reg = XAE_FCC_OFFSET,
106 .m_or = XAE_FCC_FCTX_MASK,
107 }, { /* Turn on promiscuous frame filtering */
108 .opt = XAE_OPTION_PROMISC,
109 .reg = XAE_FMI_OFFSET,
110 .m_or = XAE_FMI_PM_MASK,
111 }, { /* Enable transmitter */
112 .opt = XAE_OPTION_TXEN,
113 .reg = XAE_TC_OFFSET,
114 .m_or = XAE_TC_TX_MASK,
115 }, { /* Enable receiver */
116 .opt = XAE_OPTION_RXEN,
117 .reg = XAE_RCW1_OFFSET,
118 .m_or = XAE_RCW1_RX_MASK,
119 },
120 {}
121};
122
123/**
124 * axienet_dma_in32 - Memory mapped Axi DMA register read
125 * @lp: Pointer to axienet local structure
126 * @reg: Address offset from the base address of the Axi DMA core
127 *
128 * Return: The contents of the Axi DMA register
129 *
130 * This function returns the contents of the corresponding Axi DMA register.
131 */
132static inline u32 axienet_dma_in32(struct axienet_local *lp, off_t reg)
133{
134 return ioread32(lp->dma_regs + reg);
135}
136
137static void desc_set_phys_addr(struct axienet_local *lp, dma_addr_t addr,
138 struct axidma_bd *desc)
139{
140 desc->phys = lower_32_bits(addr);
141 if (lp->features & XAE_FEATURE_DMA_64BIT)
142 desc->phys_msb = upper_32_bits(addr);
143}
144
145static dma_addr_t desc_get_phys_addr(struct axienet_local *lp,
146 struct axidma_bd *desc)
147{
148 dma_addr_t ret = desc->phys;
149
150 if (lp->features & XAE_FEATURE_DMA_64BIT)
151 ret |= ((dma_addr_t)desc->phys_msb << 16) << 16;
152
153 return ret;
154}
155
156/**
157 * axienet_dma_bd_release - Release buffer descriptor rings
158 * @ndev: Pointer to the net_device structure
159 *
160 * This function is used to release the descriptors allocated in
161 * axienet_dma_bd_init. axienet_dma_bd_release is called when Axi Ethernet
162 * driver stop api is called.
163 */
164static void axienet_dma_bd_release(struct net_device *ndev)
165{
166 int i;
167 struct axienet_local *lp = netdev_priv(dev: ndev);
168
169 /* If we end up here, tx_bd_v must have been DMA allocated. */
170 dma_free_coherent(dev: lp->dev,
171 size: sizeof(*lp->tx_bd_v) * lp->tx_bd_num,
172 cpu_addr: lp->tx_bd_v,
173 dma_handle: lp->tx_bd_p);
174
175 if (!lp->rx_bd_v)
176 return;
177
178 for (i = 0; i < lp->rx_bd_num; i++) {
179 dma_addr_t phys;
180
181 /* A NULL skb means this descriptor has not been initialised
182 * at all.
183 */
184 if (!lp->rx_bd_v[i].skb)
185 break;
186
187 dev_kfree_skb(lp->rx_bd_v[i].skb);
188
189 /* For each descriptor, we programmed cntrl with the (non-zero)
190 * descriptor size, after it had been successfully allocated.
191 * So a non-zero value in there means we need to unmap it.
192 */
193 if (lp->rx_bd_v[i].cntrl) {
194 phys = desc_get_phys_addr(lp, desc: &lp->rx_bd_v[i]);
195 dma_unmap_single(lp->dev, phys,
196 lp->max_frm_size, DMA_FROM_DEVICE);
197 }
198 }
199
200 dma_free_coherent(dev: lp->dev,
201 size: sizeof(*lp->rx_bd_v) * lp->rx_bd_num,
202 cpu_addr: lp->rx_bd_v,
203 dma_handle: lp->rx_bd_p);
204}
205
206/**
207 * axienet_usec_to_timer - Calculate IRQ delay timer value
208 * @lp: Pointer to the axienet_local structure
209 * @coalesce_usec: Microseconds to convert into timer value
210 */
211static u32 axienet_usec_to_timer(struct axienet_local *lp, u32 coalesce_usec)
212{
213 u32 result;
214 u64 clk_rate = 125000000; /* arbitrary guess if no clock rate set */
215
216 if (lp->axi_clk)
217 clk_rate = clk_get_rate(clk: lp->axi_clk);
218
219 /* 1 Timeout Interval = 125 * (clock period of SG clock) */
220 result = DIV64_U64_ROUND_CLOSEST((u64)coalesce_usec * clk_rate,
221 (u64)125000000);
222 if (result > 255)
223 result = 255;
224
225 return result;
226}
227
228/**
229 * axienet_dma_start - Set up DMA registers and start DMA operation
230 * @lp: Pointer to the axienet_local structure
231 */
232static void axienet_dma_start(struct axienet_local *lp)
233{
234 /* Start updating the Rx channel control register */
235 lp->rx_dma_cr = (lp->coalesce_count_rx << XAXIDMA_COALESCE_SHIFT) |
236 XAXIDMA_IRQ_IOC_MASK | XAXIDMA_IRQ_ERROR_MASK;
237 /* Only set interrupt delay timer if not generating an interrupt on
238 * the first RX packet. Otherwise leave at 0 to disable delay interrupt.
239 */
240 if (lp->coalesce_count_rx > 1)
241 lp->rx_dma_cr |= (axienet_usec_to_timer(lp, coalesce_usec: lp->coalesce_usec_rx)
242 << XAXIDMA_DELAY_SHIFT) |
243 XAXIDMA_IRQ_DELAY_MASK;
244 axienet_dma_out32(lp, XAXIDMA_RX_CR_OFFSET, value: lp->rx_dma_cr);
245
246 /* Start updating the Tx channel control register */
247 lp->tx_dma_cr = (lp->coalesce_count_tx << XAXIDMA_COALESCE_SHIFT) |
248 XAXIDMA_IRQ_IOC_MASK | XAXIDMA_IRQ_ERROR_MASK;
249 /* Only set interrupt delay timer if not generating an interrupt on
250 * the first TX packet. Otherwise leave at 0 to disable delay interrupt.
251 */
252 if (lp->coalesce_count_tx > 1)
253 lp->tx_dma_cr |= (axienet_usec_to_timer(lp, coalesce_usec: lp->coalesce_usec_tx)
254 << XAXIDMA_DELAY_SHIFT) |
255 XAXIDMA_IRQ_DELAY_MASK;
256 axienet_dma_out32(lp, XAXIDMA_TX_CR_OFFSET, value: lp->tx_dma_cr);
257
258 /* Populate the tail pointer and bring the Rx Axi DMA engine out of
259 * halted state. This will make the Rx side ready for reception.
260 */
261 axienet_dma_out_addr(lp, XAXIDMA_RX_CDESC_OFFSET, addr: lp->rx_bd_p);
262 lp->rx_dma_cr |= XAXIDMA_CR_RUNSTOP_MASK;
263 axienet_dma_out32(lp, XAXIDMA_RX_CR_OFFSET, value: lp->rx_dma_cr);
264 axienet_dma_out_addr(lp, XAXIDMA_RX_TDESC_OFFSET, addr: lp->rx_bd_p +
265 (sizeof(*lp->rx_bd_v) * (lp->rx_bd_num - 1)));
266
267 /* Write to the RS (Run-stop) bit in the Tx channel control register.
268 * Tx channel is now ready to run. But only after we write to the
269 * tail pointer register that the Tx channel will start transmitting.
270 */
271 axienet_dma_out_addr(lp, XAXIDMA_TX_CDESC_OFFSET, addr: lp->tx_bd_p);
272 lp->tx_dma_cr |= XAXIDMA_CR_RUNSTOP_MASK;
273 axienet_dma_out32(lp, XAXIDMA_TX_CR_OFFSET, value: lp->tx_dma_cr);
274}
275
276/**
277 * axienet_dma_bd_init - Setup buffer descriptor rings for Axi DMA
278 * @ndev: Pointer to the net_device structure
279 *
280 * Return: 0, on success -ENOMEM, on failure
281 *
282 * This function is called to initialize the Rx and Tx DMA descriptor
283 * rings. This initializes the descriptors with required default values
284 * and is called when Axi Ethernet driver reset is called.
285 */
286static int axienet_dma_bd_init(struct net_device *ndev)
287{
288 int i;
289 struct sk_buff *skb;
290 struct axienet_local *lp = netdev_priv(dev: ndev);
291
292 /* Reset the indexes which are used for accessing the BDs */
293 lp->tx_bd_ci = 0;
294 lp->tx_bd_tail = 0;
295 lp->rx_bd_ci = 0;
296
297 /* Allocate the Tx and Rx buffer descriptors. */
298 lp->tx_bd_v = dma_alloc_coherent(dev: lp->dev,
299 size: sizeof(*lp->tx_bd_v) * lp->tx_bd_num,
300 dma_handle: &lp->tx_bd_p, GFP_KERNEL);
301 if (!lp->tx_bd_v)
302 return -ENOMEM;
303
304 lp->rx_bd_v = dma_alloc_coherent(dev: lp->dev,
305 size: sizeof(*lp->rx_bd_v) * lp->rx_bd_num,
306 dma_handle: &lp->rx_bd_p, GFP_KERNEL);
307 if (!lp->rx_bd_v)
308 goto out;
309
310 for (i = 0; i < lp->tx_bd_num; i++) {
311 dma_addr_t addr = lp->tx_bd_p +
312 sizeof(*lp->tx_bd_v) *
313 ((i + 1) % lp->tx_bd_num);
314
315 lp->tx_bd_v[i].next = lower_32_bits(addr);
316 if (lp->features & XAE_FEATURE_DMA_64BIT)
317 lp->tx_bd_v[i].next_msb = upper_32_bits(addr);
318 }
319
320 for (i = 0; i < lp->rx_bd_num; i++) {
321 dma_addr_t addr;
322
323 addr = lp->rx_bd_p + sizeof(*lp->rx_bd_v) *
324 ((i + 1) % lp->rx_bd_num);
325 lp->rx_bd_v[i].next = lower_32_bits(addr);
326 if (lp->features & XAE_FEATURE_DMA_64BIT)
327 lp->rx_bd_v[i].next_msb = upper_32_bits(addr);
328
329 skb = netdev_alloc_skb_ip_align(dev: ndev, length: lp->max_frm_size);
330 if (!skb)
331 goto out;
332
333 lp->rx_bd_v[i].skb = skb;
334 addr = dma_map_single(lp->dev, skb->data,
335 lp->max_frm_size, DMA_FROM_DEVICE);
336 if (dma_mapping_error(dev: lp->dev, dma_addr: addr)) {
337 netdev_err(dev: ndev, format: "DMA mapping error\n");
338 goto out;
339 }
340 desc_set_phys_addr(lp, addr, desc: &lp->rx_bd_v[i]);
341
342 lp->rx_bd_v[i].cntrl = lp->max_frm_size;
343 }
344
345 axienet_dma_start(lp);
346
347 return 0;
348out:
349 axienet_dma_bd_release(ndev);
350 return -ENOMEM;
351}
352
353/**
354 * axienet_set_mac_address - Write the MAC address
355 * @ndev: Pointer to the net_device structure
356 * @address: 6 byte Address to be written as MAC address
357 *
358 * This function is called to initialize the MAC address of the Axi Ethernet
359 * core. It writes to the UAW0 and UAW1 registers of the core.
360 */
361static void axienet_set_mac_address(struct net_device *ndev,
362 const void *address)
363{
364 struct axienet_local *lp = netdev_priv(dev: ndev);
365
366 if (address)
367 eth_hw_addr_set(dev: ndev, addr: address);
368 if (!is_valid_ether_addr(addr: ndev->dev_addr))
369 eth_hw_addr_random(dev: ndev);
370
371 /* Set up unicast MAC address filter set its mac address */
372 axienet_iow(lp, XAE_UAW0_OFFSET,
373 value: (ndev->dev_addr[0]) |
374 (ndev->dev_addr[1] << 8) |
375 (ndev->dev_addr[2] << 16) |
376 (ndev->dev_addr[3] << 24));
377 axienet_iow(lp, XAE_UAW1_OFFSET,
378 value: (((axienet_ior(lp, XAE_UAW1_OFFSET)) &
379 ~XAE_UAW1_UNICASTADDR_MASK) |
380 (ndev->dev_addr[4] |
381 (ndev->dev_addr[5] << 8))));
382}
383
384/**
385 * netdev_set_mac_address - Write the MAC address (from outside the driver)
386 * @ndev: Pointer to the net_device structure
387 * @p: 6 byte Address to be written as MAC address
388 *
389 * Return: 0 for all conditions. Presently, there is no failure case.
390 *
391 * This function is called to initialize the MAC address of the Axi Ethernet
392 * core. It calls the core specific axienet_set_mac_address. This is the
393 * function that goes into net_device_ops structure entry ndo_set_mac_address.
394 */
395static int netdev_set_mac_address(struct net_device *ndev, void *p)
396{
397 struct sockaddr *addr = p;
398 axienet_set_mac_address(ndev, address: addr->sa_data);
399 return 0;
400}
401
402/**
403 * axienet_set_multicast_list - Prepare the multicast table
404 * @ndev: Pointer to the net_device structure
405 *
406 * This function is called to initialize the multicast table during
407 * initialization. The Axi Ethernet basic multicast support has a four-entry
408 * multicast table which is initialized here. Additionally this function
409 * goes into the net_device_ops structure entry ndo_set_multicast_list. This
410 * means whenever the multicast table entries need to be updated this
411 * function gets called.
412 */
413static void axienet_set_multicast_list(struct net_device *ndev)
414{
415 int i;
416 u32 reg, af0reg, af1reg;
417 struct axienet_local *lp = netdev_priv(dev: ndev);
418
419 if (ndev->flags & (IFF_ALLMULTI | IFF_PROMISC) ||
420 netdev_mc_count(ndev) > XAE_MULTICAST_CAM_TABLE_NUM) {
421 /* We must make the kernel realize we had to move into
422 * promiscuous mode. If it was a promiscuous mode request
423 * the flag is already set. If not we set it.
424 */
425 ndev->flags |= IFF_PROMISC;
426 reg = axienet_ior(lp, XAE_FMI_OFFSET);
427 reg |= XAE_FMI_PM_MASK;
428 axienet_iow(lp, XAE_FMI_OFFSET, value: reg);
429 dev_info(&ndev->dev, "Promiscuous mode enabled.\n");
430 } else if (!netdev_mc_empty(ndev)) {
431 struct netdev_hw_addr *ha;
432
433 i = 0;
434 netdev_for_each_mc_addr(ha, ndev) {
435 if (i >= XAE_MULTICAST_CAM_TABLE_NUM)
436 break;
437
438 af0reg = (ha->addr[0]);
439 af0reg |= (ha->addr[1] << 8);
440 af0reg |= (ha->addr[2] << 16);
441 af0reg |= (ha->addr[3] << 24);
442
443 af1reg = (ha->addr[4]);
444 af1reg |= (ha->addr[5] << 8);
445
446 reg = axienet_ior(lp, XAE_FMI_OFFSET) & 0xFFFFFF00;
447 reg |= i;
448
449 axienet_iow(lp, XAE_FMI_OFFSET, value: reg);
450 axienet_iow(lp, XAE_AF0_OFFSET, value: af0reg);
451 axienet_iow(lp, XAE_AF1_OFFSET, value: af1reg);
452 i++;
453 }
454 } else {
455 reg = axienet_ior(lp, XAE_FMI_OFFSET);
456 reg &= ~XAE_FMI_PM_MASK;
457
458 axienet_iow(lp, XAE_FMI_OFFSET, value: reg);
459
460 for (i = 0; i < XAE_MULTICAST_CAM_TABLE_NUM; i++) {
461 reg = axienet_ior(lp, XAE_FMI_OFFSET) & 0xFFFFFF00;
462 reg |= i;
463
464 axienet_iow(lp, XAE_FMI_OFFSET, value: reg);
465 axienet_iow(lp, XAE_AF0_OFFSET, value: 0);
466 axienet_iow(lp, XAE_AF1_OFFSET, value: 0);
467 }
468
469 dev_info(&ndev->dev, "Promiscuous mode disabled.\n");
470 }
471}
472
473/**
474 * axienet_setoptions - Set an Axi Ethernet option
475 * @ndev: Pointer to the net_device structure
476 * @options: Option to be enabled/disabled
477 *
478 * The Axi Ethernet core has multiple features which can be selectively turned
479 * on or off. The typical options could be jumbo frame option, basic VLAN
480 * option, promiscuous mode option etc. This function is used to set or clear
481 * these options in the Axi Ethernet hardware. This is done through
482 * axienet_option structure .
483 */
484static void axienet_setoptions(struct net_device *ndev, u32 options)
485{
486 int reg;
487 struct axienet_local *lp = netdev_priv(dev: ndev);
488 struct axienet_option *tp = &axienet_options[0];
489
490 while (tp->opt) {
491 reg = ((axienet_ior(lp, offset: tp->reg)) & ~(tp->m_or));
492 if (options & tp->opt)
493 reg |= tp->m_or;
494 axienet_iow(lp, offset: tp->reg, value: reg);
495 tp++;
496 }
497
498 lp->options |= options;
499}
500
501static int __axienet_device_reset(struct axienet_local *lp)
502{
503 u32 value;
504 int ret;
505
506 /* Reset Axi DMA. This would reset Axi Ethernet core as well. The reset
507 * process of Axi DMA takes a while to complete as all pending
508 * commands/transfers will be flushed or completed during this
509 * reset process.
510 * Note that even though both TX and RX have their own reset register,
511 * they both reset the entire DMA core, so only one needs to be used.
512 */
513 axienet_dma_out32(lp, XAXIDMA_TX_CR_OFFSET, XAXIDMA_CR_RESET_MASK);
514 ret = read_poll_timeout(axienet_dma_in32, value,
515 !(value & XAXIDMA_CR_RESET_MASK),
516 DELAY_OF_ONE_MILLISEC, 50000, false, lp,
517 XAXIDMA_TX_CR_OFFSET);
518 if (ret) {
519 dev_err(lp->dev, "%s: DMA reset timeout!\n", __func__);
520 return ret;
521 }
522
523 /* Wait for PhyRstCmplt bit to be set, indicating the PHY reset has finished */
524 ret = read_poll_timeout(axienet_ior, value,
525 value & XAE_INT_PHYRSTCMPLT_MASK,
526 DELAY_OF_ONE_MILLISEC, 50000, false, lp,
527 XAE_IS_OFFSET);
528 if (ret) {
529 dev_err(lp->dev, "%s: timeout waiting for PhyRstCmplt\n", __func__);
530 return ret;
531 }
532
533 return 0;
534}
535
536/**
537 * axienet_dma_stop - Stop DMA operation
538 * @lp: Pointer to the axienet_local structure
539 */
540static void axienet_dma_stop(struct axienet_local *lp)
541{
542 int count;
543 u32 cr, sr;
544
545 cr = axienet_dma_in32(lp, XAXIDMA_RX_CR_OFFSET);
546 cr &= ~(XAXIDMA_CR_RUNSTOP_MASK | XAXIDMA_IRQ_ALL_MASK);
547 axienet_dma_out32(lp, XAXIDMA_RX_CR_OFFSET, value: cr);
548 synchronize_irq(irq: lp->rx_irq);
549
550 cr = axienet_dma_in32(lp, XAXIDMA_TX_CR_OFFSET);
551 cr &= ~(XAXIDMA_CR_RUNSTOP_MASK | XAXIDMA_IRQ_ALL_MASK);
552 axienet_dma_out32(lp, XAXIDMA_TX_CR_OFFSET, value: cr);
553 synchronize_irq(irq: lp->tx_irq);
554
555 /* Give DMAs a chance to halt gracefully */
556 sr = axienet_dma_in32(lp, XAXIDMA_RX_SR_OFFSET);
557 for (count = 0; !(sr & XAXIDMA_SR_HALT_MASK) && count < 5; ++count) {
558 msleep(msecs: 20);
559 sr = axienet_dma_in32(lp, XAXIDMA_RX_SR_OFFSET);
560 }
561
562 sr = axienet_dma_in32(lp, XAXIDMA_TX_SR_OFFSET);
563 for (count = 0; !(sr & XAXIDMA_SR_HALT_MASK) && count < 5; ++count) {
564 msleep(msecs: 20);
565 sr = axienet_dma_in32(lp, XAXIDMA_TX_SR_OFFSET);
566 }
567
568 /* Do a reset to ensure DMA is really stopped */
569 axienet_lock_mii(lp);
570 __axienet_device_reset(lp);
571 axienet_unlock_mii(lp);
572}
573
574/**
575 * axienet_device_reset - Reset and initialize the Axi Ethernet hardware.
576 * @ndev: Pointer to the net_device structure
577 *
578 * This function is called to reset and initialize the Axi Ethernet core. This
579 * is typically called during initialization. It does a reset of the Axi DMA
580 * Rx/Tx channels and initializes the Axi DMA BDs. Since Axi DMA reset lines
581 * are connected to Axi Ethernet reset lines, this in turn resets the Axi
582 * Ethernet core. No separate hardware reset is done for the Axi Ethernet
583 * core.
584 * Returns 0 on success or a negative error number otherwise.
585 */
586static int axienet_device_reset(struct net_device *ndev)
587{
588 u32 axienet_status;
589 struct axienet_local *lp = netdev_priv(dev: ndev);
590 int ret;
591
592 ret = __axienet_device_reset(lp);
593 if (ret)
594 return ret;
595
596 lp->max_frm_size = XAE_MAX_VLAN_FRAME_SIZE;
597 lp->options |= XAE_OPTION_VLAN;
598 lp->options &= (~XAE_OPTION_JUMBO);
599
600 if ((ndev->mtu > XAE_MTU) &&
601 (ndev->mtu <= XAE_JUMBO_MTU)) {
602 lp->max_frm_size = ndev->mtu + VLAN_ETH_HLEN +
603 XAE_TRL_SIZE;
604
605 if (lp->max_frm_size <= lp->rxmem)
606 lp->options |= XAE_OPTION_JUMBO;
607 }
608
609 ret = axienet_dma_bd_init(ndev);
610 if (ret) {
611 netdev_err(dev: ndev, format: "%s: descriptor allocation failed\n",
612 __func__);
613 return ret;
614 }
615
616 axienet_status = axienet_ior(lp, XAE_RCW1_OFFSET);
617 axienet_status &= ~XAE_RCW1_RX_MASK;
618 axienet_iow(lp, XAE_RCW1_OFFSET, value: axienet_status);
619
620 axienet_status = axienet_ior(lp, XAE_IP_OFFSET);
621 if (axienet_status & XAE_INT_RXRJECT_MASK)
622 axienet_iow(lp, XAE_IS_OFFSET, XAE_INT_RXRJECT_MASK);
623 axienet_iow(lp, XAE_IE_OFFSET, value: lp->eth_irq > 0 ?
624 XAE_INT_RECV_ERROR_MASK : 0);
625
626 axienet_iow(lp, XAE_FCC_OFFSET, XAE_FCC_FCRX_MASK);
627
628 /* Sync default options with HW but leave receiver and
629 * transmitter disabled.
630 */
631 axienet_setoptions(ndev, options: lp->options &
632 ~(XAE_OPTION_TXEN | XAE_OPTION_RXEN));
633 axienet_set_mac_address(ndev, NULL);
634 axienet_set_multicast_list(ndev);
635 axienet_setoptions(ndev, options: lp->options);
636
637 netif_trans_update(dev: ndev);
638
639 return 0;
640}
641
642/**
643 * axienet_free_tx_chain - Clean up a series of linked TX descriptors.
644 * @lp: Pointer to the axienet_local structure
645 * @first_bd: Index of first descriptor to clean up
646 * @nr_bds: Max number of descriptors to clean up
647 * @force: Whether to clean descriptors even if not complete
648 * @sizep: Pointer to a u32 filled with the total sum of all bytes
649 * in all cleaned-up descriptors. Ignored if NULL.
650 * @budget: NAPI budget (use 0 when not called from NAPI poll)
651 *
652 * Would either be called after a successful transmit operation, or after
653 * there was an error when setting up the chain.
654 * Returns the number of descriptors handled.
655 */
656static int axienet_free_tx_chain(struct axienet_local *lp, u32 first_bd,
657 int nr_bds, bool force, u32 *sizep, int budget)
658{
659 struct axidma_bd *cur_p;
660 unsigned int status;
661 dma_addr_t phys;
662 int i;
663
664 for (i = 0; i < nr_bds; i++) {
665 cur_p = &lp->tx_bd_v[(first_bd + i) % lp->tx_bd_num];
666 status = cur_p->status;
667
668 /* If force is not specified, clean up only descriptors
669 * that have been completed by the MAC.
670 */
671 if (!force && !(status & XAXIDMA_BD_STS_COMPLETE_MASK))
672 break;
673
674 /* Ensure we see complete descriptor update */
675 dma_rmb();
676 phys = desc_get_phys_addr(lp, desc: cur_p);
677 dma_unmap_single(lp->dev, phys,
678 (cur_p->cntrl & XAXIDMA_BD_CTRL_LENGTH_MASK),
679 DMA_TO_DEVICE);
680
681 if (cur_p->skb && (status & XAXIDMA_BD_STS_COMPLETE_MASK))
682 napi_consume_skb(skb: cur_p->skb, budget);
683
684 cur_p->app0 = 0;
685 cur_p->app1 = 0;
686 cur_p->app2 = 0;
687 cur_p->app4 = 0;
688 cur_p->skb = NULL;
689 /* ensure our transmit path and device don't prematurely see status cleared */
690 wmb();
691 cur_p->cntrl = 0;
692 cur_p->status = 0;
693
694 if (sizep)
695 *sizep += status & XAXIDMA_BD_STS_ACTUAL_LEN_MASK;
696 }
697
698 return i;
699}
700
701/**
702 * axienet_check_tx_bd_space - Checks if a BD/group of BDs are currently busy
703 * @lp: Pointer to the axienet_local structure
704 * @num_frag: The number of BDs to check for
705 *
706 * Return: 0, on success
707 * NETDEV_TX_BUSY, if any of the descriptors are not free
708 *
709 * This function is invoked before BDs are allocated and transmission starts.
710 * This function returns 0 if a BD or group of BDs can be allocated for
711 * transmission. If the BD or any of the BDs are not free the function
712 * returns a busy status.
713 */
714static inline int axienet_check_tx_bd_space(struct axienet_local *lp,
715 int num_frag)
716{
717 struct axidma_bd *cur_p;
718
719 /* Ensure we see all descriptor updates from device or TX polling */
720 rmb();
721 cur_p = &lp->tx_bd_v[(READ_ONCE(lp->tx_bd_tail) + num_frag) %
722 lp->tx_bd_num];
723 if (cur_p->cntrl)
724 return NETDEV_TX_BUSY;
725 return 0;
726}
727
728/**
729 * axienet_tx_poll - Invoked once a transmit is completed by the
730 * Axi DMA Tx channel.
731 * @napi: Pointer to NAPI structure.
732 * @budget: Max number of TX packets to process.
733 *
734 * Return: Number of TX packets processed.
735 *
736 * This function is invoked from the NAPI processing to notify the completion
737 * of transmit operation. It clears fields in the corresponding Tx BDs and
738 * unmaps the corresponding buffer so that CPU can regain ownership of the
739 * buffer. It finally invokes "netif_wake_queue" to restart transmission if
740 * required.
741 */
742static int axienet_tx_poll(struct napi_struct *napi, int budget)
743{
744 struct axienet_local *lp = container_of(napi, struct axienet_local, napi_tx);
745 struct net_device *ndev = lp->ndev;
746 u32 size = 0;
747 int packets;
748
749 packets = axienet_free_tx_chain(lp, first_bd: lp->tx_bd_ci, nr_bds: budget, force: false, sizep: &size, budget);
750
751 if (packets) {
752 lp->tx_bd_ci += packets;
753 if (lp->tx_bd_ci >= lp->tx_bd_num)
754 lp->tx_bd_ci %= lp->tx_bd_num;
755
756 u64_stats_update_begin(syncp: &lp->tx_stat_sync);
757 u64_stats_add(p: &lp->tx_packets, val: packets);
758 u64_stats_add(p: &lp->tx_bytes, val: size);
759 u64_stats_update_end(syncp: &lp->tx_stat_sync);
760
761 /* Matches barrier in axienet_start_xmit */
762 smp_mb();
763
764 if (!axienet_check_tx_bd_space(lp, MAX_SKB_FRAGS + 1))
765 netif_wake_queue(dev: ndev);
766 }
767
768 if (packets < budget && napi_complete_done(n: napi, work_done: packets)) {
769 /* Re-enable TX completion interrupts. This should
770 * cause an immediate interrupt if any TX packets are
771 * already pending.
772 */
773 axienet_dma_out32(lp, XAXIDMA_TX_CR_OFFSET, value: lp->tx_dma_cr);
774 }
775 return packets;
776}
777
778/**
779 * axienet_start_xmit - Starts the transmission.
780 * @skb: sk_buff pointer that contains data to be Txed.
781 * @ndev: Pointer to net_device structure.
782 *
783 * Return: NETDEV_TX_OK, on success
784 * NETDEV_TX_BUSY, if any of the descriptors are not free
785 *
786 * This function is invoked from upper layers to initiate transmission. The
787 * function uses the next available free BDs and populates their fields to
788 * start the transmission. Additionally if checksum offloading is supported,
789 * it populates AXI Stream Control fields with appropriate values.
790 */
791static netdev_tx_t
792axienet_start_xmit(struct sk_buff *skb, struct net_device *ndev)
793{
794 u32 ii;
795 u32 num_frag;
796 u32 csum_start_off;
797 u32 csum_index_off;
798 skb_frag_t *frag;
799 dma_addr_t tail_p, phys;
800 u32 orig_tail_ptr, new_tail_ptr;
801 struct axienet_local *lp = netdev_priv(dev: ndev);
802 struct axidma_bd *cur_p;
803
804 orig_tail_ptr = lp->tx_bd_tail;
805 new_tail_ptr = orig_tail_ptr;
806
807 num_frag = skb_shinfo(skb)->nr_frags;
808 cur_p = &lp->tx_bd_v[orig_tail_ptr];
809
810 if (axienet_check_tx_bd_space(lp, num_frag: num_frag + 1)) {
811 /* Should not happen as last start_xmit call should have
812 * checked for sufficient space and queue should only be
813 * woken when sufficient space is available.
814 */
815 netif_stop_queue(dev: ndev);
816 if (net_ratelimit())
817 netdev_warn(dev: ndev, format: "TX ring unexpectedly full\n");
818 return NETDEV_TX_BUSY;
819 }
820
821 if (skb->ip_summed == CHECKSUM_PARTIAL) {
822 if (lp->features & XAE_FEATURE_FULL_TX_CSUM) {
823 /* Tx Full Checksum Offload Enabled */
824 cur_p->app0 |= 2;
825 } else if (lp->features & XAE_FEATURE_PARTIAL_RX_CSUM) {
826 csum_start_off = skb_transport_offset(skb);
827 csum_index_off = csum_start_off + skb->csum_offset;
828 /* Tx Partial Checksum Offload Enabled */
829 cur_p->app0 |= 1;
830 cur_p->app1 = (csum_start_off << 16) | csum_index_off;
831 }
832 } else if (skb->ip_summed == CHECKSUM_UNNECESSARY) {
833 cur_p->app0 |= 2; /* Tx Full Checksum Offload Enabled */
834 }
835
836 phys = dma_map_single(lp->dev, skb->data,
837 skb_headlen(skb), DMA_TO_DEVICE);
838 if (unlikely(dma_mapping_error(lp->dev, phys))) {
839 if (net_ratelimit())
840 netdev_err(dev: ndev, format: "TX DMA mapping error\n");
841 ndev->stats.tx_dropped++;
842 return NETDEV_TX_OK;
843 }
844 desc_set_phys_addr(lp, addr: phys, desc: cur_p);
845 cur_p->cntrl = skb_headlen(skb) | XAXIDMA_BD_CTRL_TXSOF_MASK;
846
847 for (ii = 0; ii < num_frag; ii++) {
848 if (++new_tail_ptr >= lp->tx_bd_num)
849 new_tail_ptr = 0;
850 cur_p = &lp->tx_bd_v[new_tail_ptr];
851 frag = &skb_shinfo(skb)->frags[ii];
852 phys = dma_map_single(lp->dev,
853 skb_frag_address(frag),
854 skb_frag_size(frag),
855 DMA_TO_DEVICE);
856 if (unlikely(dma_mapping_error(lp->dev, phys))) {
857 if (net_ratelimit())
858 netdev_err(dev: ndev, format: "TX DMA mapping error\n");
859 ndev->stats.tx_dropped++;
860 axienet_free_tx_chain(lp, first_bd: orig_tail_ptr, nr_bds: ii + 1,
861 force: true, NULL, budget: 0);
862 return NETDEV_TX_OK;
863 }
864 desc_set_phys_addr(lp, addr: phys, desc: cur_p);
865 cur_p->cntrl = skb_frag_size(frag);
866 }
867
868 cur_p->cntrl |= XAXIDMA_BD_CTRL_TXEOF_MASK;
869 cur_p->skb = skb;
870
871 tail_p = lp->tx_bd_p + sizeof(*lp->tx_bd_v) * new_tail_ptr;
872 if (++new_tail_ptr >= lp->tx_bd_num)
873 new_tail_ptr = 0;
874 WRITE_ONCE(lp->tx_bd_tail, new_tail_ptr);
875
876 /* Start the transfer */
877 axienet_dma_out_addr(lp, XAXIDMA_TX_TDESC_OFFSET, addr: tail_p);
878
879 /* Stop queue if next transmit may not have space */
880 if (axienet_check_tx_bd_space(lp, MAX_SKB_FRAGS + 1)) {
881 netif_stop_queue(dev: ndev);
882
883 /* Matches barrier in axienet_tx_poll */
884 smp_mb();
885
886 /* Space might have just been freed - check again */
887 if (!axienet_check_tx_bd_space(lp, MAX_SKB_FRAGS + 1))
888 netif_wake_queue(dev: ndev);
889 }
890
891 return NETDEV_TX_OK;
892}
893
894/**
895 * axienet_rx_poll - Triggered by RX ISR to complete the BD processing.
896 * @napi: Pointer to NAPI structure.
897 * @budget: Max number of RX packets to process.
898 *
899 * Return: Number of RX packets processed.
900 */
901static int axienet_rx_poll(struct napi_struct *napi, int budget)
902{
903 u32 length;
904 u32 csumstatus;
905 u32 size = 0;
906 int packets = 0;
907 dma_addr_t tail_p = 0;
908 struct axidma_bd *cur_p;
909 struct sk_buff *skb, *new_skb;
910 struct axienet_local *lp = container_of(napi, struct axienet_local, napi_rx);
911
912 cur_p = &lp->rx_bd_v[lp->rx_bd_ci];
913
914 while (packets < budget && (cur_p->status & XAXIDMA_BD_STS_COMPLETE_MASK)) {
915 dma_addr_t phys;
916
917 /* Ensure we see complete descriptor update */
918 dma_rmb();
919
920 skb = cur_p->skb;
921 cur_p->skb = NULL;
922
923 /* skb could be NULL if a previous pass already received the
924 * packet for this slot in the ring, but failed to refill it
925 * with a newly allocated buffer. In this case, don't try to
926 * receive it again.
927 */
928 if (likely(skb)) {
929 length = cur_p->app4 & 0x0000FFFF;
930
931 phys = desc_get_phys_addr(lp, desc: cur_p);
932 dma_unmap_single(lp->dev, phys, lp->max_frm_size,
933 DMA_FROM_DEVICE);
934
935 skb_put(skb, len: length);
936 skb->protocol = eth_type_trans(skb, dev: lp->ndev);
937 /*skb_checksum_none_assert(skb);*/
938 skb->ip_summed = CHECKSUM_NONE;
939
940 /* if we're doing Rx csum offload, set it up */
941 if (lp->features & XAE_FEATURE_FULL_RX_CSUM) {
942 csumstatus = (cur_p->app2 &
943 XAE_FULL_CSUM_STATUS_MASK) >> 3;
944 if (csumstatus == XAE_IP_TCP_CSUM_VALIDATED ||
945 csumstatus == XAE_IP_UDP_CSUM_VALIDATED) {
946 skb->ip_summed = CHECKSUM_UNNECESSARY;
947 }
948 } else if ((lp->features & XAE_FEATURE_PARTIAL_RX_CSUM) != 0 &&
949 skb->protocol == htons(ETH_P_IP) &&
950 skb->len > 64) {
951 skb->csum = be32_to_cpu(cur_p->app3 & 0xFFFF);
952 skb->ip_summed = CHECKSUM_COMPLETE;
953 }
954
955 napi_gro_receive(napi, skb);
956
957 size += length;
958 packets++;
959 }
960
961 new_skb = napi_alloc_skb(napi, length: lp->max_frm_size);
962 if (!new_skb)
963 break;
964
965 phys = dma_map_single(lp->dev, new_skb->data,
966 lp->max_frm_size,
967 DMA_FROM_DEVICE);
968 if (unlikely(dma_mapping_error(lp->dev, phys))) {
969 if (net_ratelimit())
970 netdev_err(dev: lp->ndev, format: "RX DMA mapping error\n");
971 dev_kfree_skb(new_skb);
972 break;
973 }
974 desc_set_phys_addr(lp, addr: phys, desc: cur_p);
975
976 cur_p->cntrl = lp->max_frm_size;
977 cur_p->status = 0;
978 cur_p->skb = new_skb;
979
980 /* Only update tail_p to mark this slot as usable after it has
981 * been successfully refilled.
982 */
983 tail_p = lp->rx_bd_p + sizeof(*lp->rx_bd_v) * lp->rx_bd_ci;
984
985 if (++lp->rx_bd_ci >= lp->rx_bd_num)
986 lp->rx_bd_ci = 0;
987 cur_p = &lp->rx_bd_v[lp->rx_bd_ci];
988 }
989
990 u64_stats_update_begin(syncp: &lp->rx_stat_sync);
991 u64_stats_add(p: &lp->rx_packets, val: packets);
992 u64_stats_add(p: &lp->rx_bytes, val: size);
993 u64_stats_update_end(syncp: &lp->rx_stat_sync);
994
995 if (tail_p)
996 axienet_dma_out_addr(lp, XAXIDMA_RX_TDESC_OFFSET, addr: tail_p);
997
998 if (packets < budget && napi_complete_done(n: napi, work_done: packets)) {
999 /* Re-enable RX completion interrupts. This should
1000 * cause an immediate interrupt if any RX packets are
1001 * already pending.
1002 */
1003 axienet_dma_out32(lp, XAXIDMA_RX_CR_OFFSET, value: lp->rx_dma_cr);
1004 }
1005 return packets;
1006}
1007
1008/**
1009 * axienet_tx_irq - Tx Done Isr.
1010 * @irq: irq number
1011 * @_ndev: net_device pointer
1012 *
1013 * Return: IRQ_HANDLED if device generated a TX interrupt, IRQ_NONE otherwise.
1014 *
1015 * This is the Axi DMA Tx done Isr. It invokes NAPI polling to complete the
1016 * TX BD processing.
1017 */
1018static irqreturn_t axienet_tx_irq(int irq, void *_ndev)
1019{
1020 unsigned int status;
1021 struct net_device *ndev = _ndev;
1022 struct axienet_local *lp = netdev_priv(dev: ndev);
1023
1024 status = axienet_dma_in32(lp, XAXIDMA_TX_SR_OFFSET);
1025
1026 if (!(status & XAXIDMA_IRQ_ALL_MASK))
1027 return IRQ_NONE;
1028
1029 axienet_dma_out32(lp, XAXIDMA_TX_SR_OFFSET, value: status);
1030
1031 if (unlikely(status & XAXIDMA_IRQ_ERROR_MASK)) {
1032 netdev_err(dev: ndev, format: "DMA Tx error 0x%x\n", status);
1033 netdev_err(dev: ndev, format: "Current BD is at: 0x%x%08x\n",
1034 (lp->tx_bd_v[lp->tx_bd_ci]).phys_msb,
1035 (lp->tx_bd_v[lp->tx_bd_ci]).phys);
1036 schedule_work(work: &lp->dma_err_task);
1037 } else {
1038 /* Disable further TX completion interrupts and schedule
1039 * NAPI to handle the completions.
1040 */
1041 u32 cr = lp->tx_dma_cr;
1042
1043 cr &= ~(XAXIDMA_IRQ_IOC_MASK | XAXIDMA_IRQ_DELAY_MASK);
1044 axienet_dma_out32(lp, XAXIDMA_TX_CR_OFFSET, value: cr);
1045
1046 napi_schedule(n: &lp->napi_tx);
1047 }
1048
1049 return IRQ_HANDLED;
1050}
1051
1052/**
1053 * axienet_rx_irq - Rx Isr.
1054 * @irq: irq number
1055 * @_ndev: net_device pointer
1056 *
1057 * Return: IRQ_HANDLED if device generated a RX interrupt, IRQ_NONE otherwise.
1058 *
1059 * This is the Axi DMA Rx Isr. It invokes NAPI polling to complete the RX BD
1060 * processing.
1061 */
1062static irqreturn_t axienet_rx_irq(int irq, void *_ndev)
1063{
1064 unsigned int status;
1065 struct net_device *ndev = _ndev;
1066 struct axienet_local *lp = netdev_priv(dev: ndev);
1067
1068 status = axienet_dma_in32(lp, XAXIDMA_RX_SR_OFFSET);
1069
1070 if (!(status & XAXIDMA_IRQ_ALL_MASK))
1071 return IRQ_NONE;
1072
1073 axienet_dma_out32(lp, XAXIDMA_RX_SR_OFFSET, value: status);
1074
1075 if (unlikely(status & XAXIDMA_IRQ_ERROR_MASK)) {
1076 netdev_err(dev: ndev, format: "DMA Rx error 0x%x\n", status);
1077 netdev_err(dev: ndev, format: "Current BD is at: 0x%x%08x\n",
1078 (lp->rx_bd_v[lp->rx_bd_ci]).phys_msb,
1079 (lp->rx_bd_v[lp->rx_bd_ci]).phys);
1080 schedule_work(work: &lp->dma_err_task);
1081 } else {
1082 /* Disable further RX completion interrupts and schedule
1083 * NAPI receive.
1084 */
1085 u32 cr = lp->rx_dma_cr;
1086
1087 cr &= ~(XAXIDMA_IRQ_IOC_MASK | XAXIDMA_IRQ_DELAY_MASK);
1088 axienet_dma_out32(lp, XAXIDMA_RX_CR_OFFSET, value: cr);
1089
1090 napi_schedule(n: &lp->napi_rx);
1091 }
1092
1093 return IRQ_HANDLED;
1094}
1095
1096/**
1097 * axienet_eth_irq - Ethernet core Isr.
1098 * @irq: irq number
1099 * @_ndev: net_device pointer
1100 *
1101 * Return: IRQ_HANDLED if device generated a core interrupt, IRQ_NONE otherwise.
1102 *
1103 * Handle miscellaneous conditions indicated by Ethernet core IRQ.
1104 */
1105static irqreturn_t axienet_eth_irq(int irq, void *_ndev)
1106{
1107 struct net_device *ndev = _ndev;
1108 struct axienet_local *lp = netdev_priv(dev: ndev);
1109 unsigned int pending;
1110
1111 pending = axienet_ior(lp, XAE_IP_OFFSET);
1112 if (!pending)
1113 return IRQ_NONE;
1114
1115 if (pending & XAE_INT_RXFIFOOVR_MASK)
1116 ndev->stats.rx_missed_errors++;
1117
1118 if (pending & XAE_INT_RXRJECT_MASK)
1119 ndev->stats.rx_frame_errors++;
1120
1121 axienet_iow(lp, XAE_IS_OFFSET, value: pending);
1122 return IRQ_HANDLED;
1123}
1124
1125static void axienet_dma_err_handler(struct work_struct *work);
1126
1127/**
1128 * axienet_open - Driver open routine.
1129 * @ndev: Pointer to net_device structure
1130 *
1131 * Return: 0, on success.
1132 * non-zero error value on failure
1133 *
1134 * This is the driver open routine. It calls phylink_start to start the
1135 * PHY device.
1136 * It also allocates interrupt service routines, enables the interrupt lines
1137 * and ISR handling. Axi Ethernet core is reset through Axi DMA core. Buffer
1138 * descriptors are initialized.
1139 */
1140static int axienet_open(struct net_device *ndev)
1141{
1142 int ret;
1143 struct axienet_local *lp = netdev_priv(dev: ndev);
1144
1145 dev_dbg(&ndev->dev, "axienet_open()\n");
1146
1147 /* When we do an Axi Ethernet reset, it resets the complete core
1148 * including the MDIO. MDIO must be disabled before resetting.
1149 * Hold MDIO bus lock to avoid MDIO accesses during the reset.
1150 */
1151 axienet_lock_mii(lp);
1152 ret = axienet_device_reset(ndev);
1153 axienet_unlock_mii(lp);
1154
1155 ret = phylink_of_phy_connect(lp->phylink, lp->dev->of_node, flags: 0);
1156 if (ret) {
1157 dev_err(lp->dev, "phylink_of_phy_connect() failed: %d\n", ret);
1158 return ret;
1159 }
1160
1161 phylink_start(lp->phylink);
1162
1163 /* Enable worker thread for Axi DMA error handling */
1164 INIT_WORK(&lp->dma_err_task, axienet_dma_err_handler);
1165
1166 napi_enable(n: &lp->napi_rx);
1167 napi_enable(n: &lp->napi_tx);
1168
1169 /* Enable interrupts for Axi DMA Tx */
1170 ret = request_irq(irq: lp->tx_irq, handler: axienet_tx_irq, IRQF_SHARED,
1171 name: ndev->name, dev: ndev);
1172 if (ret)
1173 goto err_tx_irq;
1174 /* Enable interrupts for Axi DMA Rx */
1175 ret = request_irq(irq: lp->rx_irq, handler: axienet_rx_irq, IRQF_SHARED,
1176 name: ndev->name, dev: ndev);
1177 if (ret)
1178 goto err_rx_irq;
1179 /* Enable interrupts for Axi Ethernet core (if defined) */
1180 if (lp->eth_irq > 0) {
1181 ret = request_irq(irq: lp->eth_irq, handler: axienet_eth_irq, IRQF_SHARED,
1182 name: ndev->name, dev: ndev);
1183 if (ret)
1184 goto err_eth_irq;
1185 }
1186
1187 return 0;
1188
1189err_eth_irq:
1190 free_irq(lp->rx_irq, ndev);
1191err_rx_irq:
1192 free_irq(lp->tx_irq, ndev);
1193err_tx_irq:
1194 napi_disable(n: &lp->napi_tx);
1195 napi_disable(n: &lp->napi_rx);
1196 phylink_stop(lp->phylink);
1197 phylink_disconnect_phy(lp->phylink);
1198 cancel_work_sync(work: &lp->dma_err_task);
1199 dev_err(lp->dev, "request_irq() failed\n");
1200 return ret;
1201}
1202
1203/**
1204 * axienet_stop - Driver stop routine.
1205 * @ndev: Pointer to net_device structure
1206 *
1207 * Return: 0, on success.
1208 *
1209 * This is the driver stop routine. It calls phylink_disconnect to stop the PHY
1210 * device. It also removes the interrupt handlers and disables the interrupts.
1211 * The Axi DMA Tx/Rx BDs are released.
1212 */
1213static int axienet_stop(struct net_device *ndev)
1214{
1215 struct axienet_local *lp = netdev_priv(dev: ndev);
1216
1217 dev_dbg(&ndev->dev, "axienet_close()\n");
1218
1219 napi_disable(n: &lp->napi_tx);
1220 napi_disable(n: &lp->napi_rx);
1221
1222 phylink_stop(lp->phylink);
1223 phylink_disconnect_phy(lp->phylink);
1224
1225 axienet_setoptions(ndev, options: lp->options &
1226 ~(XAE_OPTION_TXEN | XAE_OPTION_RXEN));
1227
1228 axienet_dma_stop(lp);
1229
1230 axienet_iow(lp, XAE_IE_OFFSET, value: 0);
1231
1232 cancel_work_sync(work: &lp->dma_err_task);
1233
1234 if (lp->eth_irq > 0)
1235 free_irq(lp->eth_irq, ndev);
1236 free_irq(lp->tx_irq, ndev);
1237 free_irq(lp->rx_irq, ndev);
1238
1239 axienet_dma_bd_release(ndev);
1240 return 0;
1241}
1242
1243/**
1244 * axienet_change_mtu - Driver change mtu routine.
1245 * @ndev: Pointer to net_device structure
1246 * @new_mtu: New mtu value to be applied
1247 *
1248 * Return: Always returns 0 (success).
1249 *
1250 * This is the change mtu driver routine. It checks if the Axi Ethernet
1251 * hardware supports jumbo frames before changing the mtu. This can be
1252 * called only when the device is not up.
1253 */
1254static int axienet_change_mtu(struct net_device *ndev, int new_mtu)
1255{
1256 struct axienet_local *lp = netdev_priv(dev: ndev);
1257
1258 if (netif_running(dev: ndev))
1259 return -EBUSY;
1260
1261 if ((new_mtu + VLAN_ETH_HLEN +
1262 XAE_TRL_SIZE) > lp->rxmem)
1263 return -EINVAL;
1264
1265 ndev->mtu = new_mtu;
1266
1267 return 0;
1268}
1269
1270#ifdef CONFIG_NET_POLL_CONTROLLER
1271/**
1272 * axienet_poll_controller - Axi Ethernet poll mechanism.
1273 * @ndev: Pointer to net_device structure
1274 *
1275 * This implements Rx/Tx ISR poll mechanisms. The interrupts are disabled prior
1276 * to polling the ISRs and are enabled back after the polling is done.
1277 */
1278static void axienet_poll_controller(struct net_device *ndev)
1279{
1280 struct axienet_local *lp = netdev_priv(dev: ndev);
1281 disable_irq(irq: lp->tx_irq);
1282 disable_irq(irq: lp->rx_irq);
1283 axienet_rx_irq(irq: lp->tx_irq, ndev: ndev);
1284 axienet_tx_irq(irq: lp->rx_irq, ndev: ndev);
1285 enable_irq(irq: lp->tx_irq);
1286 enable_irq(irq: lp->rx_irq);
1287}
1288#endif
1289
1290static int axienet_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
1291{
1292 struct axienet_local *lp = netdev_priv(dev);
1293
1294 if (!netif_running(dev))
1295 return -EINVAL;
1296
1297 return phylink_mii_ioctl(lp->phylink, rq, cmd);
1298}
1299
1300static void
1301axienet_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
1302{
1303 struct axienet_local *lp = netdev_priv(dev);
1304 unsigned int start;
1305
1306 netdev_stats_to_stats64(stats64: stats, netdev_stats: &dev->stats);
1307
1308 do {
1309 start = u64_stats_fetch_begin(syncp: &lp->rx_stat_sync);
1310 stats->rx_packets = u64_stats_read(p: &lp->rx_packets);
1311 stats->rx_bytes = u64_stats_read(p: &lp->rx_bytes);
1312 } while (u64_stats_fetch_retry(syncp: &lp->rx_stat_sync, start));
1313
1314 do {
1315 start = u64_stats_fetch_begin(syncp: &lp->tx_stat_sync);
1316 stats->tx_packets = u64_stats_read(p: &lp->tx_packets);
1317 stats->tx_bytes = u64_stats_read(p: &lp->tx_bytes);
1318 } while (u64_stats_fetch_retry(syncp: &lp->tx_stat_sync, start));
1319}
1320
1321static const struct net_device_ops axienet_netdev_ops = {
1322 .ndo_open = axienet_open,
1323 .ndo_stop = axienet_stop,
1324 .ndo_start_xmit = axienet_start_xmit,
1325 .ndo_get_stats64 = axienet_get_stats64,
1326 .ndo_change_mtu = axienet_change_mtu,
1327 .ndo_set_mac_address = netdev_set_mac_address,
1328 .ndo_validate_addr = eth_validate_addr,
1329 .ndo_eth_ioctl = axienet_ioctl,
1330 .ndo_set_rx_mode = axienet_set_multicast_list,
1331#ifdef CONFIG_NET_POLL_CONTROLLER
1332 .ndo_poll_controller = axienet_poll_controller,
1333#endif
1334};
1335
1336/**
1337 * axienet_ethtools_get_drvinfo - Get various Axi Ethernet driver information.
1338 * @ndev: Pointer to net_device structure
1339 * @ed: Pointer to ethtool_drvinfo structure
1340 *
1341 * This implements ethtool command for getting the driver information.
1342 * Issue "ethtool -i ethX" under linux prompt to execute this function.
1343 */
1344static void axienet_ethtools_get_drvinfo(struct net_device *ndev,
1345 struct ethtool_drvinfo *ed)
1346{
1347 strscpy(p: ed->driver, DRIVER_NAME, size: sizeof(ed->driver));
1348 strscpy(p: ed->version, DRIVER_VERSION, size: sizeof(ed->version));
1349}
1350
1351/**
1352 * axienet_ethtools_get_regs_len - Get the total regs length present in the
1353 * AxiEthernet core.
1354 * @ndev: Pointer to net_device structure
1355 *
1356 * This implements ethtool command for getting the total register length
1357 * information.
1358 *
1359 * Return: the total regs length
1360 */
1361static int axienet_ethtools_get_regs_len(struct net_device *ndev)
1362{
1363 return sizeof(u32) * AXIENET_REGS_N;
1364}
1365
1366/**
1367 * axienet_ethtools_get_regs - Dump the contents of all registers present
1368 * in AxiEthernet core.
1369 * @ndev: Pointer to net_device structure
1370 * @regs: Pointer to ethtool_regs structure
1371 * @ret: Void pointer used to return the contents of the registers.
1372 *
1373 * This implements ethtool command for getting the Axi Ethernet register dump.
1374 * Issue "ethtool -d ethX" to execute this function.
1375 */
1376static void axienet_ethtools_get_regs(struct net_device *ndev,
1377 struct ethtool_regs *regs, void *ret)
1378{
1379 u32 *data = (u32 *)ret;
1380 size_t len = sizeof(u32) * AXIENET_REGS_N;
1381 struct axienet_local *lp = netdev_priv(dev: ndev);
1382
1383 regs->version = 0;
1384 regs->len = len;
1385
1386 memset(data, 0, len);
1387 data[0] = axienet_ior(lp, XAE_RAF_OFFSET);
1388 data[1] = axienet_ior(lp, XAE_TPF_OFFSET);
1389 data[2] = axienet_ior(lp, XAE_IFGP_OFFSET);
1390 data[3] = axienet_ior(lp, XAE_IS_OFFSET);
1391 data[4] = axienet_ior(lp, XAE_IP_OFFSET);
1392 data[5] = axienet_ior(lp, XAE_IE_OFFSET);
1393 data[6] = axienet_ior(lp, XAE_TTAG_OFFSET);
1394 data[7] = axienet_ior(lp, XAE_RTAG_OFFSET);
1395 data[8] = axienet_ior(lp, XAE_UAWL_OFFSET);
1396 data[9] = axienet_ior(lp, XAE_UAWU_OFFSET);
1397 data[10] = axienet_ior(lp, XAE_TPID0_OFFSET);
1398 data[11] = axienet_ior(lp, XAE_TPID1_OFFSET);
1399 data[12] = axienet_ior(lp, XAE_PPST_OFFSET);
1400 data[13] = axienet_ior(lp, XAE_RCW0_OFFSET);
1401 data[14] = axienet_ior(lp, XAE_RCW1_OFFSET);
1402 data[15] = axienet_ior(lp, XAE_TC_OFFSET);
1403 data[16] = axienet_ior(lp, XAE_FCC_OFFSET);
1404 data[17] = axienet_ior(lp, XAE_EMMC_OFFSET);
1405 data[18] = axienet_ior(lp, XAE_PHYC_OFFSET);
1406 data[19] = axienet_ior(lp, XAE_MDIO_MC_OFFSET);
1407 data[20] = axienet_ior(lp, XAE_MDIO_MCR_OFFSET);
1408 data[21] = axienet_ior(lp, XAE_MDIO_MWD_OFFSET);
1409 data[22] = axienet_ior(lp, XAE_MDIO_MRD_OFFSET);
1410 data[27] = axienet_ior(lp, XAE_UAW0_OFFSET);
1411 data[28] = axienet_ior(lp, XAE_UAW1_OFFSET);
1412 data[29] = axienet_ior(lp, XAE_FMI_OFFSET);
1413 data[30] = axienet_ior(lp, XAE_AF0_OFFSET);
1414 data[31] = axienet_ior(lp, XAE_AF1_OFFSET);
1415 data[32] = axienet_dma_in32(lp, XAXIDMA_TX_CR_OFFSET);
1416 data[33] = axienet_dma_in32(lp, XAXIDMA_TX_SR_OFFSET);
1417 data[34] = axienet_dma_in32(lp, XAXIDMA_TX_CDESC_OFFSET);
1418 data[35] = axienet_dma_in32(lp, XAXIDMA_TX_TDESC_OFFSET);
1419 data[36] = axienet_dma_in32(lp, XAXIDMA_RX_CR_OFFSET);
1420 data[37] = axienet_dma_in32(lp, XAXIDMA_RX_SR_OFFSET);
1421 data[38] = axienet_dma_in32(lp, XAXIDMA_RX_CDESC_OFFSET);
1422 data[39] = axienet_dma_in32(lp, XAXIDMA_RX_TDESC_OFFSET);
1423}
1424
1425static void
1426axienet_ethtools_get_ringparam(struct net_device *ndev,
1427 struct ethtool_ringparam *ering,
1428 struct kernel_ethtool_ringparam *kernel_ering,
1429 struct netlink_ext_ack *extack)
1430{
1431 struct axienet_local *lp = netdev_priv(dev: ndev);
1432
1433 ering->rx_max_pending = RX_BD_NUM_MAX;
1434 ering->rx_mini_max_pending = 0;
1435 ering->rx_jumbo_max_pending = 0;
1436 ering->tx_max_pending = TX_BD_NUM_MAX;
1437 ering->rx_pending = lp->rx_bd_num;
1438 ering->rx_mini_pending = 0;
1439 ering->rx_jumbo_pending = 0;
1440 ering->tx_pending = lp->tx_bd_num;
1441}
1442
1443static int
1444axienet_ethtools_set_ringparam(struct net_device *ndev,
1445 struct ethtool_ringparam *ering,
1446 struct kernel_ethtool_ringparam *kernel_ering,
1447 struct netlink_ext_ack *extack)
1448{
1449 struct axienet_local *lp = netdev_priv(dev: ndev);
1450
1451 if (ering->rx_pending > RX_BD_NUM_MAX ||
1452 ering->rx_mini_pending ||
1453 ering->rx_jumbo_pending ||
1454 ering->tx_pending < TX_BD_NUM_MIN ||
1455 ering->tx_pending > TX_BD_NUM_MAX)
1456 return -EINVAL;
1457
1458 if (netif_running(dev: ndev))
1459 return -EBUSY;
1460
1461 lp->rx_bd_num = ering->rx_pending;
1462 lp->tx_bd_num = ering->tx_pending;
1463 return 0;
1464}
1465
1466/**
1467 * axienet_ethtools_get_pauseparam - Get the pause parameter setting for
1468 * Tx and Rx paths.
1469 * @ndev: Pointer to net_device structure
1470 * @epauseparm: Pointer to ethtool_pauseparam structure.
1471 *
1472 * This implements ethtool command for getting axi ethernet pause frame
1473 * setting. Issue "ethtool -a ethX" to execute this function.
1474 */
1475static void
1476axienet_ethtools_get_pauseparam(struct net_device *ndev,
1477 struct ethtool_pauseparam *epauseparm)
1478{
1479 struct axienet_local *lp = netdev_priv(dev: ndev);
1480
1481 phylink_ethtool_get_pauseparam(lp->phylink, epauseparm);
1482}
1483
1484/**
1485 * axienet_ethtools_set_pauseparam - Set device pause parameter(flow control)
1486 * settings.
1487 * @ndev: Pointer to net_device structure
1488 * @epauseparm:Pointer to ethtool_pauseparam structure
1489 *
1490 * This implements ethtool command for enabling flow control on Rx and Tx
1491 * paths. Issue "ethtool -A ethX tx on|off" under linux prompt to execute this
1492 * function.
1493 *
1494 * Return: 0 on success, -EFAULT if device is running
1495 */
1496static int
1497axienet_ethtools_set_pauseparam(struct net_device *ndev,
1498 struct ethtool_pauseparam *epauseparm)
1499{
1500 struct axienet_local *lp = netdev_priv(dev: ndev);
1501
1502 return phylink_ethtool_set_pauseparam(lp->phylink, epauseparm);
1503}
1504
1505/**
1506 * axienet_ethtools_get_coalesce - Get DMA interrupt coalescing count.
1507 * @ndev: Pointer to net_device structure
1508 * @ecoalesce: Pointer to ethtool_coalesce structure
1509 * @kernel_coal: ethtool CQE mode setting structure
1510 * @extack: extack for reporting error messages
1511 *
1512 * This implements ethtool command for getting the DMA interrupt coalescing
1513 * count on Tx and Rx paths. Issue "ethtool -c ethX" under linux prompt to
1514 * execute this function.
1515 *
1516 * Return: 0 always
1517 */
1518static int
1519axienet_ethtools_get_coalesce(struct net_device *ndev,
1520 struct ethtool_coalesce *ecoalesce,
1521 struct kernel_ethtool_coalesce *kernel_coal,
1522 struct netlink_ext_ack *extack)
1523{
1524 struct axienet_local *lp = netdev_priv(dev: ndev);
1525
1526 ecoalesce->rx_max_coalesced_frames = lp->coalesce_count_rx;
1527 ecoalesce->rx_coalesce_usecs = lp->coalesce_usec_rx;
1528 ecoalesce->tx_max_coalesced_frames = lp->coalesce_count_tx;
1529 ecoalesce->tx_coalesce_usecs = lp->coalesce_usec_tx;
1530 return 0;
1531}
1532
1533/**
1534 * axienet_ethtools_set_coalesce - Set DMA interrupt coalescing count.
1535 * @ndev: Pointer to net_device structure
1536 * @ecoalesce: Pointer to ethtool_coalesce structure
1537 * @kernel_coal: ethtool CQE mode setting structure
1538 * @extack: extack for reporting error messages
1539 *
1540 * This implements ethtool command for setting the DMA interrupt coalescing
1541 * count on Tx and Rx paths. Issue "ethtool -C ethX rx-frames 5" under linux
1542 * prompt to execute this function.
1543 *
1544 * Return: 0, on success, Non-zero error value on failure.
1545 */
1546static int
1547axienet_ethtools_set_coalesce(struct net_device *ndev,
1548 struct ethtool_coalesce *ecoalesce,
1549 struct kernel_ethtool_coalesce *kernel_coal,
1550 struct netlink_ext_ack *extack)
1551{
1552 struct axienet_local *lp = netdev_priv(dev: ndev);
1553
1554 if (netif_running(dev: ndev)) {
1555 netdev_err(dev: ndev,
1556 format: "Please stop netif before applying configuration\n");
1557 return -EFAULT;
1558 }
1559
1560 if (ecoalesce->rx_max_coalesced_frames)
1561 lp->coalesce_count_rx = ecoalesce->rx_max_coalesced_frames;
1562 if (ecoalesce->rx_coalesce_usecs)
1563 lp->coalesce_usec_rx = ecoalesce->rx_coalesce_usecs;
1564 if (ecoalesce->tx_max_coalesced_frames)
1565 lp->coalesce_count_tx = ecoalesce->tx_max_coalesced_frames;
1566 if (ecoalesce->tx_coalesce_usecs)
1567 lp->coalesce_usec_tx = ecoalesce->tx_coalesce_usecs;
1568
1569 return 0;
1570}
1571
1572static int
1573axienet_ethtools_get_link_ksettings(struct net_device *ndev,
1574 struct ethtool_link_ksettings *cmd)
1575{
1576 struct axienet_local *lp = netdev_priv(dev: ndev);
1577
1578 return phylink_ethtool_ksettings_get(lp->phylink, cmd);
1579}
1580
1581static int
1582axienet_ethtools_set_link_ksettings(struct net_device *ndev,
1583 const struct ethtool_link_ksettings *cmd)
1584{
1585 struct axienet_local *lp = netdev_priv(dev: ndev);
1586
1587 return phylink_ethtool_ksettings_set(lp->phylink, cmd);
1588}
1589
1590static int axienet_ethtools_nway_reset(struct net_device *dev)
1591{
1592 struct axienet_local *lp = netdev_priv(dev);
1593
1594 return phylink_ethtool_nway_reset(lp->phylink);
1595}
1596
1597static const struct ethtool_ops axienet_ethtool_ops = {
1598 .supported_coalesce_params = ETHTOOL_COALESCE_MAX_FRAMES |
1599 ETHTOOL_COALESCE_USECS,
1600 .get_drvinfo = axienet_ethtools_get_drvinfo,
1601 .get_regs_len = axienet_ethtools_get_regs_len,
1602 .get_regs = axienet_ethtools_get_regs,
1603 .get_link = ethtool_op_get_link,
1604 .get_ringparam = axienet_ethtools_get_ringparam,
1605 .set_ringparam = axienet_ethtools_set_ringparam,
1606 .get_pauseparam = axienet_ethtools_get_pauseparam,
1607 .set_pauseparam = axienet_ethtools_set_pauseparam,
1608 .get_coalesce = axienet_ethtools_get_coalesce,
1609 .set_coalesce = axienet_ethtools_set_coalesce,
1610 .get_link_ksettings = axienet_ethtools_get_link_ksettings,
1611 .set_link_ksettings = axienet_ethtools_set_link_ksettings,
1612 .nway_reset = axienet_ethtools_nway_reset,
1613};
1614
1615static struct axienet_local *pcs_to_axienet_local(struct phylink_pcs *pcs)
1616{
1617 return container_of(pcs, struct axienet_local, pcs);
1618}
1619
1620static void axienet_pcs_get_state(struct phylink_pcs *pcs,
1621 struct phylink_link_state *state)
1622{
1623 struct mdio_device *pcs_phy = pcs_to_axienet_local(pcs)->pcs_phy;
1624
1625 phylink_mii_c22_pcs_get_state(pcs: pcs_phy, state);
1626}
1627
1628static void axienet_pcs_an_restart(struct phylink_pcs *pcs)
1629{
1630 struct mdio_device *pcs_phy = pcs_to_axienet_local(pcs)->pcs_phy;
1631
1632 phylink_mii_c22_pcs_an_restart(pcs: pcs_phy);
1633}
1634
1635static int axienet_pcs_config(struct phylink_pcs *pcs, unsigned int neg_mode,
1636 phy_interface_t interface,
1637 const unsigned long *advertising,
1638 bool permit_pause_to_mac)
1639{
1640 struct mdio_device *pcs_phy = pcs_to_axienet_local(pcs)->pcs_phy;
1641 struct net_device *ndev = pcs_to_axienet_local(pcs)->ndev;
1642 struct axienet_local *lp = netdev_priv(dev: ndev);
1643 int ret;
1644
1645 if (lp->switch_x_sgmii) {
1646 ret = mdiodev_write(mdiodev: pcs_phy, XLNX_MII_STD_SELECT_REG,
1647 val: interface == PHY_INTERFACE_MODE_SGMII ?
1648 XLNX_MII_STD_SELECT_SGMII : 0);
1649 if (ret < 0) {
1650 netdev_warn(dev: ndev,
1651 format: "Failed to switch PHY interface: %d\n",
1652 ret);
1653 return ret;
1654 }
1655 }
1656
1657 ret = phylink_mii_c22_pcs_config(pcs: pcs_phy, interface, advertising,
1658 neg_mode);
1659 if (ret < 0)
1660 netdev_warn(dev: ndev, format: "Failed to configure PCS: %d\n", ret);
1661
1662 return ret;
1663}
1664
1665static const struct phylink_pcs_ops axienet_pcs_ops = {
1666 .pcs_get_state = axienet_pcs_get_state,
1667 .pcs_config = axienet_pcs_config,
1668 .pcs_an_restart = axienet_pcs_an_restart,
1669};
1670
1671static struct phylink_pcs *axienet_mac_select_pcs(struct phylink_config *config,
1672 phy_interface_t interface)
1673{
1674 struct net_device *ndev = to_net_dev(config->dev);
1675 struct axienet_local *lp = netdev_priv(dev: ndev);
1676
1677 if (interface == PHY_INTERFACE_MODE_1000BASEX ||
1678 interface == PHY_INTERFACE_MODE_SGMII)
1679 return &lp->pcs;
1680
1681 return NULL;
1682}
1683
1684static void axienet_mac_config(struct phylink_config *config, unsigned int mode,
1685 const struct phylink_link_state *state)
1686{
1687 /* nothing meaningful to do */
1688}
1689
1690static void axienet_mac_link_down(struct phylink_config *config,
1691 unsigned int mode,
1692 phy_interface_t interface)
1693{
1694 /* nothing meaningful to do */
1695}
1696
1697static void axienet_mac_link_up(struct phylink_config *config,
1698 struct phy_device *phy,
1699 unsigned int mode, phy_interface_t interface,
1700 int speed, int duplex,
1701 bool tx_pause, bool rx_pause)
1702{
1703 struct net_device *ndev = to_net_dev(config->dev);
1704 struct axienet_local *lp = netdev_priv(dev: ndev);
1705 u32 emmc_reg, fcc_reg;
1706
1707 emmc_reg = axienet_ior(lp, XAE_EMMC_OFFSET);
1708 emmc_reg &= ~XAE_EMMC_LINKSPEED_MASK;
1709
1710 switch (speed) {
1711 case SPEED_1000:
1712 emmc_reg |= XAE_EMMC_LINKSPD_1000;
1713 break;
1714 case SPEED_100:
1715 emmc_reg |= XAE_EMMC_LINKSPD_100;
1716 break;
1717 case SPEED_10:
1718 emmc_reg |= XAE_EMMC_LINKSPD_10;
1719 break;
1720 default:
1721 dev_err(&ndev->dev,
1722 "Speed other than 10, 100 or 1Gbps is not supported\n");
1723 break;
1724 }
1725
1726 axienet_iow(lp, XAE_EMMC_OFFSET, value: emmc_reg);
1727
1728 fcc_reg = axienet_ior(lp, XAE_FCC_OFFSET);
1729 if (tx_pause)
1730 fcc_reg |= XAE_FCC_FCTX_MASK;
1731 else
1732 fcc_reg &= ~XAE_FCC_FCTX_MASK;
1733 if (rx_pause)
1734 fcc_reg |= XAE_FCC_FCRX_MASK;
1735 else
1736 fcc_reg &= ~XAE_FCC_FCRX_MASK;
1737 axienet_iow(lp, XAE_FCC_OFFSET, value: fcc_reg);
1738}
1739
1740static const struct phylink_mac_ops axienet_phylink_ops = {
1741 .mac_select_pcs = axienet_mac_select_pcs,
1742 .mac_config = axienet_mac_config,
1743 .mac_link_down = axienet_mac_link_down,
1744 .mac_link_up = axienet_mac_link_up,
1745};
1746
1747/**
1748 * axienet_dma_err_handler - Work queue task for Axi DMA Error
1749 * @work: pointer to work_struct
1750 *
1751 * Resets the Axi DMA and Axi Ethernet devices, and reconfigures the
1752 * Tx/Rx BDs.
1753 */
1754static void axienet_dma_err_handler(struct work_struct *work)
1755{
1756 u32 i;
1757 u32 axienet_status;
1758 struct axidma_bd *cur_p;
1759 struct axienet_local *lp = container_of(work, struct axienet_local,
1760 dma_err_task);
1761 struct net_device *ndev = lp->ndev;
1762
1763 napi_disable(n: &lp->napi_tx);
1764 napi_disable(n: &lp->napi_rx);
1765
1766 axienet_setoptions(ndev, options: lp->options &
1767 ~(XAE_OPTION_TXEN | XAE_OPTION_RXEN));
1768
1769 axienet_dma_stop(lp);
1770
1771 for (i = 0; i < lp->tx_bd_num; i++) {
1772 cur_p = &lp->tx_bd_v[i];
1773 if (cur_p->cntrl) {
1774 dma_addr_t addr = desc_get_phys_addr(lp, desc: cur_p);
1775
1776 dma_unmap_single(lp->dev, addr,
1777 (cur_p->cntrl &
1778 XAXIDMA_BD_CTRL_LENGTH_MASK),
1779 DMA_TO_DEVICE);
1780 }
1781 if (cur_p->skb)
1782 dev_kfree_skb_irq(skb: cur_p->skb);
1783 cur_p->phys = 0;
1784 cur_p->phys_msb = 0;
1785 cur_p->cntrl = 0;
1786 cur_p->status = 0;
1787 cur_p->app0 = 0;
1788 cur_p->app1 = 0;
1789 cur_p->app2 = 0;
1790 cur_p->app3 = 0;
1791 cur_p->app4 = 0;
1792 cur_p->skb = NULL;
1793 }
1794
1795 for (i = 0; i < lp->rx_bd_num; i++) {
1796 cur_p = &lp->rx_bd_v[i];
1797 cur_p->status = 0;
1798 cur_p->app0 = 0;
1799 cur_p->app1 = 0;
1800 cur_p->app2 = 0;
1801 cur_p->app3 = 0;
1802 cur_p->app4 = 0;
1803 }
1804
1805 lp->tx_bd_ci = 0;
1806 lp->tx_bd_tail = 0;
1807 lp->rx_bd_ci = 0;
1808
1809 axienet_dma_start(lp);
1810
1811 axienet_status = axienet_ior(lp, XAE_RCW1_OFFSET);
1812 axienet_status &= ~XAE_RCW1_RX_MASK;
1813 axienet_iow(lp, XAE_RCW1_OFFSET, value: axienet_status);
1814
1815 axienet_status = axienet_ior(lp, XAE_IP_OFFSET);
1816 if (axienet_status & XAE_INT_RXRJECT_MASK)
1817 axienet_iow(lp, XAE_IS_OFFSET, XAE_INT_RXRJECT_MASK);
1818 axienet_iow(lp, XAE_IE_OFFSET, value: lp->eth_irq > 0 ?
1819 XAE_INT_RECV_ERROR_MASK : 0);
1820 axienet_iow(lp, XAE_FCC_OFFSET, XAE_FCC_FCRX_MASK);
1821
1822 /* Sync default options with HW but leave receiver and
1823 * transmitter disabled.
1824 */
1825 axienet_setoptions(ndev, options: lp->options &
1826 ~(XAE_OPTION_TXEN | XAE_OPTION_RXEN));
1827 axienet_set_mac_address(ndev, NULL);
1828 axienet_set_multicast_list(ndev);
1829 axienet_setoptions(ndev, options: lp->options);
1830 napi_enable(n: &lp->napi_rx);
1831 napi_enable(n: &lp->napi_tx);
1832}
1833
1834/**
1835 * axienet_probe - Axi Ethernet probe function.
1836 * @pdev: Pointer to platform device structure.
1837 *
1838 * Return: 0, on success
1839 * Non-zero error value on failure.
1840 *
1841 * This is the probe routine for Axi Ethernet driver. This is called before
1842 * any other driver routines are invoked. It allocates and sets up the Ethernet
1843 * device. Parses through device tree and populates fields of
1844 * axienet_local. It registers the Ethernet device.
1845 */
1846static int axienet_probe(struct platform_device *pdev)
1847{
1848 int ret;
1849 struct device_node *np;
1850 struct axienet_local *lp;
1851 struct net_device *ndev;
1852 struct resource *ethres;
1853 u8 mac_addr[ETH_ALEN];
1854 int addr_width = 32;
1855 u32 value;
1856
1857 ndev = alloc_etherdev(sizeof(*lp));
1858 if (!ndev)
1859 return -ENOMEM;
1860
1861 platform_set_drvdata(pdev, data: ndev);
1862
1863 SET_NETDEV_DEV(ndev, &pdev->dev);
1864 ndev->flags &= ~IFF_MULTICAST; /* clear multicast */
1865 ndev->features = NETIF_F_SG;
1866 ndev->netdev_ops = &axienet_netdev_ops;
1867 ndev->ethtool_ops = &axienet_ethtool_ops;
1868
1869 /* MTU range: 64 - 9000 */
1870 ndev->min_mtu = 64;
1871 ndev->max_mtu = XAE_JUMBO_MTU;
1872
1873 lp = netdev_priv(dev: ndev);
1874 lp->ndev = ndev;
1875 lp->dev = &pdev->dev;
1876 lp->options = XAE_OPTION_DEFAULTS;
1877 lp->rx_bd_num = RX_BD_NUM_DEFAULT;
1878 lp->tx_bd_num = TX_BD_NUM_DEFAULT;
1879
1880 u64_stats_init(syncp: &lp->rx_stat_sync);
1881 u64_stats_init(syncp: &lp->tx_stat_sync);
1882
1883 netif_napi_add(dev: ndev, napi: &lp->napi_rx, poll: axienet_rx_poll);
1884 netif_napi_add(dev: ndev, napi: &lp->napi_tx, poll: axienet_tx_poll);
1885
1886 lp->axi_clk = devm_clk_get_optional(dev: &pdev->dev, id: "s_axi_lite_clk");
1887 if (!lp->axi_clk) {
1888 /* For backward compatibility, if named AXI clock is not present,
1889 * treat the first clock specified as the AXI clock.
1890 */
1891 lp->axi_clk = devm_clk_get_optional(dev: &pdev->dev, NULL);
1892 }
1893 if (IS_ERR(ptr: lp->axi_clk)) {
1894 ret = PTR_ERR(ptr: lp->axi_clk);
1895 goto free_netdev;
1896 }
1897 ret = clk_prepare_enable(clk: lp->axi_clk);
1898 if (ret) {
1899 dev_err(&pdev->dev, "Unable to enable AXI clock: %d\n", ret);
1900 goto free_netdev;
1901 }
1902
1903 lp->misc_clks[0].id = "axis_clk";
1904 lp->misc_clks[1].id = "ref_clk";
1905 lp->misc_clks[2].id = "mgt_clk";
1906
1907 ret = devm_clk_bulk_get_optional(dev: &pdev->dev, XAE_NUM_MISC_CLOCKS, clks: lp->misc_clks);
1908 if (ret)
1909 goto cleanup_clk;
1910
1911 ret = clk_bulk_prepare_enable(XAE_NUM_MISC_CLOCKS, clks: lp->misc_clks);
1912 if (ret)
1913 goto cleanup_clk;
1914
1915 /* Map device registers */
1916 lp->regs = devm_platform_get_and_ioremap_resource(pdev, index: 0, res: &ethres);
1917 if (IS_ERR(ptr: lp->regs)) {
1918 ret = PTR_ERR(ptr: lp->regs);
1919 goto cleanup_clk;
1920 }
1921 lp->regs_start = ethres->start;
1922
1923 /* Setup checksum offload, but default to off if not specified */
1924 lp->features = 0;
1925
1926 ret = of_property_read_u32(np: pdev->dev.of_node, propname: "xlnx,txcsum", out_value: &value);
1927 if (!ret) {
1928 switch (value) {
1929 case 1:
1930 lp->csum_offload_on_tx_path =
1931 XAE_FEATURE_PARTIAL_TX_CSUM;
1932 lp->features |= XAE_FEATURE_PARTIAL_TX_CSUM;
1933 /* Can checksum TCP/UDP over IPv4. */
1934 ndev->features |= NETIF_F_IP_CSUM;
1935 break;
1936 case 2:
1937 lp->csum_offload_on_tx_path =
1938 XAE_FEATURE_FULL_TX_CSUM;
1939 lp->features |= XAE_FEATURE_FULL_TX_CSUM;
1940 /* Can checksum TCP/UDP over IPv4. */
1941 ndev->features |= NETIF_F_IP_CSUM;
1942 break;
1943 default:
1944 lp->csum_offload_on_tx_path = XAE_NO_CSUM_OFFLOAD;
1945 }
1946 }
1947 ret = of_property_read_u32(np: pdev->dev.of_node, propname: "xlnx,rxcsum", out_value: &value);
1948 if (!ret) {
1949 switch (value) {
1950 case 1:
1951 lp->csum_offload_on_rx_path =
1952 XAE_FEATURE_PARTIAL_RX_CSUM;
1953 lp->features |= XAE_FEATURE_PARTIAL_RX_CSUM;
1954 break;
1955 case 2:
1956 lp->csum_offload_on_rx_path =
1957 XAE_FEATURE_FULL_RX_CSUM;
1958 lp->features |= XAE_FEATURE_FULL_RX_CSUM;
1959 break;
1960 default:
1961 lp->csum_offload_on_rx_path = XAE_NO_CSUM_OFFLOAD;
1962 }
1963 }
1964 /* For supporting jumbo frames, the Axi Ethernet hardware must have
1965 * a larger Rx/Tx Memory. Typically, the size must be large so that
1966 * we can enable jumbo option and start supporting jumbo frames.
1967 * Here we check for memory allocated for Rx/Tx in the hardware from
1968 * the device-tree and accordingly set flags.
1969 */
1970 of_property_read_u32(np: pdev->dev.of_node, propname: "xlnx,rxmem", out_value: &lp->rxmem);
1971
1972 lp->switch_x_sgmii = of_property_read_bool(np: pdev->dev.of_node,
1973 propname: "xlnx,switch-x-sgmii");
1974
1975 /* Start with the proprietary, and broken phy_type */
1976 ret = of_property_read_u32(np: pdev->dev.of_node, propname: "xlnx,phy-type", out_value: &value);
1977 if (!ret) {
1978 netdev_warn(dev: ndev, format: "Please upgrade your device tree binary blob to use phy-mode");
1979 switch (value) {
1980 case XAE_PHY_TYPE_MII:
1981 lp->phy_mode = PHY_INTERFACE_MODE_MII;
1982 break;
1983 case XAE_PHY_TYPE_GMII:
1984 lp->phy_mode = PHY_INTERFACE_MODE_GMII;
1985 break;
1986 case XAE_PHY_TYPE_RGMII_2_0:
1987 lp->phy_mode = PHY_INTERFACE_MODE_RGMII_ID;
1988 break;
1989 case XAE_PHY_TYPE_SGMII:
1990 lp->phy_mode = PHY_INTERFACE_MODE_SGMII;
1991 break;
1992 case XAE_PHY_TYPE_1000BASE_X:
1993 lp->phy_mode = PHY_INTERFACE_MODE_1000BASEX;
1994 break;
1995 default:
1996 ret = -EINVAL;
1997 goto cleanup_clk;
1998 }
1999 } else {
2000 ret = of_get_phy_mode(np: pdev->dev.of_node, interface: &lp->phy_mode);
2001 if (ret)
2002 goto cleanup_clk;
2003 }
2004 if (lp->switch_x_sgmii && lp->phy_mode != PHY_INTERFACE_MODE_SGMII &&
2005 lp->phy_mode != PHY_INTERFACE_MODE_1000BASEX) {
2006 dev_err(&pdev->dev, "xlnx,switch-x-sgmii only supported with SGMII or 1000BaseX\n");
2007 ret = -EINVAL;
2008 goto cleanup_clk;
2009 }
2010
2011 /* Find the DMA node, map the DMA registers, and decode the DMA IRQs */
2012 np = of_parse_phandle(np: pdev->dev.of_node, phandle_name: "axistream-connected", index: 0);
2013 if (np) {
2014 struct resource dmares;
2015
2016 ret = of_address_to_resource(dev: np, index: 0, r: &dmares);
2017 if (ret) {
2018 dev_err(&pdev->dev,
2019 "unable to get DMA resource\n");
2020 of_node_put(node: np);
2021 goto cleanup_clk;
2022 }
2023 lp->dma_regs = devm_ioremap_resource(dev: &pdev->dev,
2024 res: &dmares);
2025 lp->rx_irq = irq_of_parse_and_map(node: np, index: 1);
2026 lp->tx_irq = irq_of_parse_and_map(node: np, index: 0);
2027 of_node_put(node: np);
2028 lp->eth_irq = platform_get_irq_optional(pdev, 0);
2029 } else {
2030 /* Check for these resources directly on the Ethernet node. */
2031 lp->dma_regs = devm_platform_get_and_ioremap_resource(pdev, index: 1, NULL);
2032 lp->rx_irq = platform_get_irq(pdev, 1);
2033 lp->tx_irq = platform_get_irq(pdev, 0);
2034 lp->eth_irq = platform_get_irq_optional(pdev, 2);
2035 }
2036 if (IS_ERR(ptr: lp->dma_regs)) {
2037 dev_err(&pdev->dev, "could not map DMA regs\n");
2038 ret = PTR_ERR(ptr: lp->dma_regs);
2039 goto cleanup_clk;
2040 }
2041 if ((lp->rx_irq <= 0) || (lp->tx_irq <= 0)) {
2042 dev_err(&pdev->dev, "could not determine irqs\n");
2043 ret = -ENOMEM;
2044 goto cleanup_clk;
2045 }
2046
2047 /* Reset core now that clocks are enabled, prior to accessing MDIO */
2048 ret = __axienet_device_reset(lp);
2049 if (ret)
2050 goto cleanup_clk;
2051
2052 /* Autodetect the need for 64-bit DMA pointers.
2053 * When the IP is configured for a bus width bigger than 32 bits,
2054 * writing the MSB registers is mandatory, even if they are all 0.
2055 * We can detect this case by writing all 1's to one such register
2056 * and see if that sticks: when the IP is configured for 32 bits
2057 * only, those registers are RES0.
2058 * Those MSB registers were introduced in IP v7.1, which we check first.
2059 */
2060 if ((axienet_ior(lp, XAE_ID_OFFSET) >> 24) >= 0x9) {
2061 void __iomem *desc = lp->dma_regs + XAXIDMA_TX_CDESC_OFFSET + 4;
2062
2063 iowrite32(0x0, desc);
2064 if (ioread32(desc) == 0) { /* sanity check */
2065 iowrite32(0xffffffff, desc);
2066 if (ioread32(desc) > 0) {
2067 lp->features |= XAE_FEATURE_DMA_64BIT;
2068 addr_width = 64;
2069 dev_info(&pdev->dev,
2070 "autodetected 64-bit DMA range\n");
2071 }
2072 iowrite32(0x0, desc);
2073 }
2074 }
2075 if (!IS_ENABLED(CONFIG_64BIT) && lp->features & XAE_FEATURE_DMA_64BIT) {
2076 dev_err(&pdev->dev, "64-bit addressable DMA is not compatible with 32-bit archecture\n");
2077 ret = -EINVAL;
2078 goto cleanup_clk;
2079 }
2080
2081 ret = dma_set_mask_and_coherent(dev: &pdev->dev, DMA_BIT_MASK(addr_width));
2082 if (ret) {
2083 dev_err(&pdev->dev, "No suitable DMA available\n");
2084 goto cleanup_clk;
2085 }
2086
2087 /* Check for Ethernet core IRQ (optional) */
2088 if (lp->eth_irq <= 0)
2089 dev_info(&pdev->dev, "Ethernet core IRQ not defined\n");
2090
2091 /* Retrieve the MAC address */
2092 ret = of_get_mac_address(np: pdev->dev.of_node, mac: mac_addr);
2093 if (!ret) {
2094 axienet_set_mac_address(ndev, address: mac_addr);
2095 } else {
2096 dev_warn(&pdev->dev, "could not find MAC address property: %d\n",
2097 ret);
2098 axienet_set_mac_address(ndev, NULL);
2099 }
2100
2101 lp->coalesce_count_rx = XAXIDMA_DFT_RX_THRESHOLD;
2102 lp->coalesce_usec_rx = XAXIDMA_DFT_RX_USEC;
2103 lp->coalesce_count_tx = XAXIDMA_DFT_TX_THRESHOLD;
2104 lp->coalesce_usec_tx = XAXIDMA_DFT_TX_USEC;
2105
2106 ret = axienet_mdio_setup(lp);
2107 if (ret)
2108 dev_warn(&pdev->dev,
2109 "error registering MDIO bus: %d\n", ret);
2110
2111 if (lp->phy_mode == PHY_INTERFACE_MODE_SGMII ||
2112 lp->phy_mode == PHY_INTERFACE_MODE_1000BASEX) {
2113 np = of_parse_phandle(np: pdev->dev.of_node, phandle_name: "pcs-handle", index: 0);
2114 if (!np) {
2115 /* Deprecated: Always use "pcs-handle" for pcs_phy.
2116 * Falling back to "phy-handle" here is only for
2117 * backward compatibility with old device trees.
2118 */
2119 np = of_parse_phandle(np: pdev->dev.of_node, phandle_name: "phy-handle", index: 0);
2120 }
2121 if (!np) {
2122 dev_err(&pdev->dev, "pcs-handle (preferred) or phy-handle required for 1000BaseX/SGMII\n");
2123 ret = -EINVAL;
2124 goto cleanup_mdio;
2125 }
2126 lp->pcs_phy = of_mdio_find_device(np);
2127 if (!lp->pcs_phy) {
2128 ret = -EPROBE_DEFER;
2129 of_node_put(node: np);
2130 goto cleanup_mdio;
2131 }
2132 of_node_put(node: np);
2133 lp->pcs.ops = &axienet_pcs_ops;
2134 lp->pcs.neg_mode = true;
2135 lp->pcs.poll = true;
2136 }
2137
2138 lp->phylink_config.dev = &ndev->dev;
2139 lp->phylink_config.type = PHYLINK_NETDEV;
2140 lp->phylink_config.mac_capabilities = MAC_SYM_PAUSE | MAC_ASYM_PAUSE |
2141 MAC_10FD | MAC_100FD | MAC_1000FD;
2142
2143 __set_bit(lp->phy_mode, lp->phylink_config.supported_interfaces);
2144 if (lp->switch_x_sgmii) {
2145 __set_bit(PHY_INTERFACE_MODE_1000BASEX,
2146 lp->phylink_config.supported_interfaces);
2147 __set_bit(PHY_INTERFACE_MODE_SGMII,
2148 lp->phylink_config.supported_interfaces);
2149 }
2150
2151 lp->phylink = phylink_create(&lp->phylink_config, pdev->dev.fwnode,
2152 lp->phy_mode,
2153 &axienet_phylink_ops);
2154 if (IS_ERR(ptr: lp->phylink)) {
2155 ret = PTR_ERR(ptr: lp->phylink);
2156 dev_err(&pdev->dev, "phylink_create error (%i)\n", ret);
2157 goto cleanup_mdio;
2158 }
2159
2160 ret = register_netdev(dev: lp->ndev);
2161 if (ret) {
2162 dev_err(lp->dev, "register_netdev() error (%i)\n", ret);
2163 goto cleanup_phylink;
2164 }
2165
2166 return 0;
2167
2168cleanup_phylink:
2169 phylink_destroy(lp->phylink);
2170
2171cleanup_mdio:
2172 if (lp->pcs_phy)
2173 put_device(dev: &lp->pcs_phy->dev);
2174 if (lp->mii_bus)
2175 axienet_mdio_teardown(lp);
2176cleanup_clk:
2177 clk_bulk_disable_unprepare(XAE_NUM_MISC_CLOCKS, clks: lp->misc_clks);
2178 clk_disable_unprepare(clk: lp->axi_clk);
2179
2180free_netdev:
2181 free_netdev(dev: ndev);
2182
2183 return ret;
2184}
2185
2186static void axienet_remove(struct platform_device *pdev)
2187{
2188 struct net_device *ndev = platform_get_drvdata(pdev);
2189 struct axienet_local *lp = netdev_priv(dev: ndev);
2190
2191 unregister_netdev(dev: ndev);
2192
2193 if (lp->phylink)
2194 phylink_destroy(lp->phylink);
2195
2196 if (lp->pcs_phy)
2197 put_device(dev: &lp->pcs_phy->dev);
2198
2199 axienet_mdio_teardown(lp);
2200
2201 clk_bulk_disable_unprepare(XAE_NUM_MISC_CLOCKS, clks: lp->misc_clks);
2202 clk_disable_unprepare(clk: lp->axi_clk);
2203
2204 free_netdev(dev: ndev);
2205}
2206
2207static void axienet_shutdown(struct platform_device *pdev)
2208{
2209 struct net_device *ndev = platform_get_drvdata(pdev);
2210
2211 rtnl_lock();
2212 netif_device_detach(dev: ndev);
2213
2214 if (netif_running(dev: ndev))
2215 dev_close(dev: ndev);
2216
2217 rtnl_unlock();
2218}
2219
2220static int axienet_suspend(struct device *dev)
2221{
2222 struct net_device *ndev = dev_get_drvdata(dev);
2223
2224 if (!netif_running(dev: ndev))
2225 return 0;
2226
2227 netif_device_detach(dev: ndev);
2228
2229 rtnl_lock();
2230 axienet_stop(ndev);
2231 rtnl_unlock();
2232
2233 return 0;
2234}
2235
2236static int axienet_resume(struct device *dev)
2237{
2238 struct net_device *ndev = dev_get_drvdata(dev);
2239
2240 if (!netif_running(dev: ndev))
2241 return 0;
2242
2243 rtnl_lock();
2244 axienet_open(ndev);
2245 rtnl_unlock();
2246
2247 netif_device_attach(dev: ndev);
2248
2249 return 0;
2250}
2251
2252static DEFINE_SIMPLE_DEV_PM_OPS(axienet_pm_ops,
2253 axienet_suspend, axienet_resume);
2254
2255static struct platform_driver axienet_driver = {
2256 .probe = axienet_probe,
2257 .remove_new = axienet_remove,
2258 .shutdown = axienet_shutdown,
2259 .driver = {
2260 .name = "xilinx_axienet",
2261 .pm = &axienet_pm_ops,
2262 .of_match_table = axienet_of_match,
2263 },
2264};
2265
2266module_platform_driver(axienet_driver);
2267
2268MODULE_DESCRIPTION("Xilinx Axi Ethernet driver");
2269MODULE_AUTHOR("Xilinx");
2270MODULE_LICENSE("GPL");
2271

source code of linux/drivers/net/ethernet/xilinx/xilinx_axienet_main.c