Loading...
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#include <linux/dmaengine.h>
42#include <linux/dma-mapping.h>
43#include <linux/dma/xilinx_dma.h>
44#include <linux/circ_buf.h>
45#include <net/netdev_queues.h>
46
47#include "xilinx_axienet.h"
48
49/* Descriptors defines for Tx and Rx DMA */
50#define TX_BD_NUM_DEFAULT 128
51#define RX_BD_NUM_DEFAULT 1024
52#define TX_BD_NUM_MIN (MAX_SKB_FRAGS + 1)
53#define TX_BD_NUM_MAX 4096
54#define RX_BD_NUM_MAX 4096
55#define DMA_NUM_APP_WORDS 5
56#define LEN_APP 4
57#define RX_BUF_NUM_DEFAULT 128
58
59/* Must be shorter than length of ethtool_drvinfo.driver field to fit */
60#define DRIVER_NAME "xaxienet"
61#define DRIVER_DESCRIPTION "Xilinx Axi Ethernet driver"
62#define DRIVER_VERSION "1.00a"
63
64#define AXIENET_REGS_N 40
65
66static void axienet_rx_submit_desc(struct net_device *ndev);
67
68/* Match table for of_platform binding */
69static const struct of_device_id axienet_of_match[] = {
70 { .compatible = "xlnx,axi-ethernet-1.00.a", },
71 { .compatible = "xlnx,axi-ethernet-1.01.a", },
72 { .compatible = "xlnx,axi-ethernet-2.01.a", },
73 {},
74};
75
76MODULE_DEVICE_TABLE(of, axienet_of_match);
77
78/* Option table for setting up Axi Ethernet hardware options */
79static struct axienet_option axienet_options[] = {
80 /* Turn on jumbo packet support for both Rx and Tx */
81 {
82 .opt = XAE_OPTION_JUMBO,
83 .reg = XAE_TC_OFFSET,
84 .m_or = XAE_TC_JUM_MASK,
85 }, {
86 .opt = XAE_OPTION_JUMBO,
87 .reg = XAE_RCW1_OFFSET,
88 .m_or = XAE_RCW1_JUM_MASK,
89 }, { /* Turn on VLAN packet support for both Rx and Tx */
90 .opt = XAE_OPTION_VLAN,
91 .reg = XAE_TC_OFFSET,
92 .m_or = XAE_TC_VLAN_MASK,
93 }, {
94 .opt = XAE_OPTION_VLAN,
95 .reg = XAE_RCW1_OFFSET,
96 .m_or = XAE_RCW1_VLAN_MASK,
97 }, { /* Turn on FCS stripping on receive packets */
98 .opt = XAE_OPTION_FCS_STRIP,
99 .reg = XAE_RCW1_OFFSET,
100 .m_or = XAE_RCW1_FCS_MASK,
101 }, { /* Turn on FCS insertion on transmit packets */
102 .opt = XAE_OPTION_FCS_INSERT,
103 .reg = XAE_TC_OFFSET,
104 .m_or = XAE_TC_FCS_MASK,
105 }, { /* Turn off length/type field checking on receive packets */
106 .opt = XAE_OPTION_LENTYPE_ERR,
107 .reg = XAE_RCW1_OFFSET,
108 .m_or = XAE_RCW1_LT_DIS_MASK,
109 }, { /* Turn on Rx flow control */
110 .opt = XAE_OPTION_FLOW_CONTROL,
111 .reg = XAE_FCC_OFFSET,
112 .m_or = XAE_FCC_FCRX_MASK,
113 }, { /* Turn on Tx flow control */
114 .opt = XAE_OPTION_FLOW_CONTROL,
115 .reg = XAE_FCC_OFFSET,
116 .m_or = XAE_FCC_FCTX_MASK,
117 }, { /* Turn on promiscuous frame filtering */
118 .opt = XAE_OPTION_PROMISC,
119 .reg = XAE_FMI_OFFSET,
120 .m_or = XAE_FMI_PM_MASK,
121 }, { /* Enable transmitter */
122 .opt = XAE_OPTION_TXEN,
123 .reg = XAE_TC_OFFSET,
124 .m_or = XAE_TC_TX_MASK,
125 }, { /* Enable receiver */
126 .opt = XAE_OPTION_RXEN,
127 .reg = XAE_RCW1_OFFSET,
128 .m_or = XAE_RCW1_RX_MASK,
129 },
130 {}
131};
132
133static struct skbuf_dma_descriptor *axienet_get_rx_desc(struct axienet_local *lp, int i)
134{
135 return lp->rx_skb_ring[i & (RX_BUF_NUM_DEFAULT - 1)];
136}
137
138static struct skbuf_dma_descriptor *axienet_get_tx_desc(struct axienet_local *lp, int i)
139{
140 return lp->tx_skb_ring[i & (TX_BD_NUM_MAX - 1)];
141}
142
143/**
144 * axienet_dma_in32 - Memory mapped Axi DMA register read
145 * @lp: Pointer to axienet local structure
146 * @reg: Address offset from the base address of the Axi DMA core
147 *
148 * Return: The contents of the Axi DMA register
149 *
150 * This function returns the contents of the corresponding Axi DMA register.
151 */
152static inline u32 axienet_dma_in32(struct axienet_local *lp, off_t reg)
153{
154 return ioread32(lp->dma_regs + reg);
155}
156
157static void desc_set_phys_addr(struct axienet_local *lp, dma_addr_t addr,
158 struct axidma_bd *desc)
159{
160 desc->phys = lower_32_bits(addr);
161 if (lp->features & XAE_FEATURE_DMA_64BIT)
162 desc->phys_msb = upper_32_bits(addr);
163}
164
165static dma_addr_t desc_get_phys_addr(struct axienet_local *lp,
166 struct axidma_bd *desc)
167{
168 dma_addr_t ret = desc->phys;
169
170 if (lp->features & XAE_FEATURE_DMA_64BIT)
171 ret |= ((dma_addr_t)desc->phys_msb << 16) << 16;
172
173 return ret;
174}
175
176/**
177 * axienet_dma_bd_release - Release buffer descriptor rings
178 * @ndev: Pointer to the net_device structure
179 *
180 * This function is used to release the descriptors allocated in
181 * axienet_dma_bd_init. axienet_dma_bd_release is called when Axi Ethernet
182 * driver stop api is called.
183 */
184static void axienet_dma_bd_release(struct net_device *ndev)
185{
186 int i;
187 struct axienet_local *lp = netdev_priv(ndev);
188
189 /* If we end up here, tx_bd_v must have been DMA allocated. */
190 dma_free_coherent(lp->dev,
191 sizeof(*lp->tx_bd_v) * lp->tx_bd_num,
192 lp->tx_bd_v,
193 lp->tx_bd_p);
194
195 if (!lp->rx_bd_v)
196 return;
197
198 for (i = 0; i < lp->rx_bd_num; i++) {
199 dma_addr_t phys;
200
201 /* A NULL skb means this descriptor has not been initialised
202 * at all.
203 */
204 if (!lp->rx_bd_v[i].skb)
205 break;
206
207 dev_kfree_skb(lp->rx_bd_v[i].skb);
208
209 /* For each descriptor, we programmed cntrl with the (non-zero)
210 * descriptor size, after it had been successfully allocated.
211 * So a non-zero value in there means we need to unmap it.
212 */
213 if (lp->rx_bd_v[i].cntrl) {
214 phys = desc_get_phys_addr(lp, &lp->rx_bd_v[i]);
215 dma_unmap_single(lp->dev, phys,
216 lp->max_frm_size, DMA_FROM_DEVICE);
217 }
218 }
219
220 dma_free_coherent(lp->dev,
221 sizeof(*lp->rx_bd_v) * lp->rx_bd_num,
222 lp->rx_bd_v,
223 lp->rx_bd_p);
224}
225
226/**
227 * axienet_usec_to_timer - Calculate IRQ delay timer value
228 * @lp: Pointer to the axienet_local structure
229 * @coalesce_usec: Microseconds to convert into timer value
230 */
231static u32 axienet_usec_to_timer(struct axienet_local *lp, u32 coalesce_usec)
232{
233 u32 result;
234 u64 clk_rate = 125000000; /* arbitrary guess if no clock rate set */
235
236 if (lp->axi_clk)
237 clk_rate = clk_get_rate(lp->axi_clk);
238
239 /* 1 Timeout Interval = 125 * (clock period of SG clock) */
240 result = DIV64_U64_ROUND_CLOSEST((u64)coalesce_usec * clk_rate,
241 (u64)125000000);
242 if (result > 255)
243 result = 255;
244
245 return result;
246}
247
248/**
249 * axienet_dma_start - Set up DMA registers and start DMA operation
250 * @lp: Pointer to the axienet_local structure
251 */
252static void axienet_dma_start(struct axienet_local *lp)
253{
254 /* Start updating the Rx channel control register */
255 lp->rx_dma_cr = (lp->coalesce_count_rx << XAXIDMA_COALESCE_SHIFT) |
256 XAXIDMA_IRQ_IOC_MASK | XAXIDMA_IRQ_ERROR_MASK;
257 /* Only set interrupt delay timer if not generating an interrupt on
258 * the first RX packet. Otherwise leave at 0 to disable delay interrupt.
259 */
260 if (lp->coalesce_count_rx > 1)
261 lp->rx_dma_cr |= (axienet_usec_to_timer(lp, lp->coalesce_usec_rx)
262 << XAXIDMA_DELAY_SHIFT) |
263 XAXIDMA_IRQ_DELAY_MASK;
264 axienet_dma_out32(lp, XAXIDMA_RX_CR_OFFSET, lp->rx_dma_cr);
265
266 /* Start updating the Tx channel control register */
267 lp->tx_dma_cr = (lp->coalesce_count_tx << XAXIDMA_COALESCE_SHIFT) |
268 XAXIDMA_IRQ_IOC_MASK | XAXIDMA_IRQ_ERROR_MASK;
269 /* Only set interrupt delay timer if not generating an interrupt on
270 * the first TX packet. Otherwise leave at 0 to disable delay interrupt.
271 */
272 if (lp->coalesce_count_tx > 1)
273 lp->tx_dma_cr |= (axienet_usec_to_timer(lp, lp->coalesce_usec_tx)
274 << XAXIDMA_DELAY_SHIFT) |
275 XAXIDMA_IRQ_DELAY_MASK;
276 axienet_dma_out32(lp, XAXIDMA_TX_CR_OFFSET, lp->tx_dma_cr);
277
278 /* Populate the tail pointer and bring the Rx Axi DMA engine out of
279 * halted state. This will make the Rx side ready for reception.
280 */
281 axienet_dma_out_addr(lp, XAXIDMA_RX_CDESC_OFFSET, lp->rx_bd_p);
282 lp->rx_dma_cr |= XAXIDMA_CR_RUNSTOP_MASK;
283 axienet_dma_out32(lp, XAXIDMA_RX_CR_OFFSET, lp->rx_dma_cr);
284 axienet_dma_out_addr(lp, XAXIDMA_RX_TDESC_OFFSET, lp->rx_bd_p +
285 (sizeof(*lp->rx_bd_v) * (lp->rx_bd_num - 1)));
286
287 /* Write to the RS (Run-stop) bit in the Tx channel control register.
288 * Tx channel is now ready to run. But only after we write to the
289 * tail pointer register that the Tx channel will start transmitting.
290 */
291 axienet_dma_out_addr(lp, XAXIDMA_TX_CDESC_OFFSET, lp->tx_bd_p);
292 lp->tx_dma_cr |= XAXIDMA_CR_RUNSTOP_MASK;
293 axienet_dma_out32(lp, XAXIDMA_TX_CR_OFFSET, lp->tx_dma_cr);
294}
295
296/**
297 * axienet_dma_bd_init - Setup buffer descriptor rings for Axi DMA
298 * @ndev: Pointer to the net_device structure
299 *
300 * Return: 0, on success -ENOMEM, on failure
301 *
302 * This function is called to initialize the Rx and Tx DMA descriptor
303 * rings. This initializes the descriptors with required default values
304 * and is called when Axi Ethernet driver reset is called.
305 */
306static int axienet_dma_bd_init(struct net_device *ndev)
307{
308 int i;
309 struct sk_buff *skb;
310 struct axienet_local *lp = netdev_priv(ndev);
311
312 /* Reset the indexes which are used for accessing the BDs */
313 lp->tx_bd_ci = 0;
314 lp->tx_bd_tail = 0;
315 lp->rx_bd_ci = 0;
316
317 /* Allocate the Tx and Rx buffer descriptors. */
318 lp->tx_bd_v = dma_alloc_coherent(lp->dev,
319 sizeof(*lp->tx_bd_v) * lp->tx_bd_num,
320 &lp->tx_bd_p, GFP_KERNEL);
321 if (!lp->tx_bd_v)
322 return -ENOMEM;
323
324 lp->rx_bd_v = dma_alloc_coherent(lp->dev,
325 sizeof(*lp->rx_bd_v) * lp->rx_bd_num,
326 &lp->rx_bd_p, GFP_KERNEL);
327 if (!lp->rx_bd_v)
328 goto out;
329
330 for (i = 0; i < lp->tx_bd_num; i++) {
331 dma_addr_t addr = lp->tx_bd_p +
332 sizeof(*lp->tx_bd_v) *
333 ((i + 1) % lp->tx_bd_num);
334
335 lp->tx_bd_v[i].next = lower_32_bits(addr);
336 if (lp->features & XAE_FEATURE_DMA_64BIT)
337 lp->tx_bd_v[i].next_msb = upper_32_bits(addr);
338 }
339
340 for (i = 0; i < lp->rx_bd_num; i++) {
341 dma_addr_t addr;
342
343 addr = lp->rx_bd_p + sizeof(*lp->rx_bd_v) *
344 ((i + 1) % lp->rx_bd_num);
345 lp->rx_bd_v[i].next = lower_32_bits(addr);
346 if (lp->features & XAE_FEATURE_DMA_64BIT)
347 lp->rx_bd_v[i].next_msb = upper_32_bits(addr);
348
349 skb = netdev_alloc_skb_ip_align(ndev, lp->max_frm_size);
350 if (!skb)
351 goto out;
352
353 lp->rx_bd_v[i].skb = skb;
354 addr = dma_map_single(lp->dev, skb->data,
355 lp->max_frm_size, DMA_FROM_DEVICE);
356 if (dma_mapping_error(lp->dev, addr)) {
357 netdev_err(ndev, "DMA mapping error\n");
358 goto out;
359 }
360 desc_set_phys_addr(lp, addr, &lp->rx_bd_v[i]);
361
362 lp->rx_bd_v[i].cntrl = lp->max_frm_size;
363 }
364
365 axienet_dma_start(lp);
366
367 return 0;
368out:
369 axienet_dma_bd_release(ndev);
370 return -ENOMEM;
371}
372
373/**
374 * axienet_set_mac_address - Write the MAC address
375 * @ndev: Pointer to the net_device structure
376 * @address: 6 byte Address to be written as MAC address
377 *
378 * This function is called to initialize the MAC address of the Axi Ethernet
379 * core. It writes to the UAW0 and UAW1 registers of the core.
380 */
381static void axienet_set_mac_address(struct net_device *ndev,
382 const void *address)
383{
384 struct axienet_local *lp = netdev_priv(ndev);
385
386 if (address)
387 eth_hw_addr_set(ndev, address);
388 if (!is_valid_ether_addr(ndev->dev_addr))
389 eth_hw_addr_random(ndev);
390
391 /* Set up unicast MAC address filter set its mac address */
392 axienet_iow(lp, XAE_UAW0_OFFSET,
393 (ndev->dev_addr[0]) |
394 (ndev->dev_addr[1] << 8) |
395 (ndev->dev_addr[2] << 16) |
396 (ndev->dev_addr[3] << 24));
397 axienet_iow(lp, XAE_UAW1_OFFSET,
398 (((axienet_ior(lp, XAE_UAW1_OFFSET)) &
399 ~XAE_UAW1_UNICASTADDR_MASK) |
400 (ndev->dev_addr[4] |
401 (ndev->dev_addr[5] << 8))));
402}
403
404/**
405 * netdev_set_mac_address - Write the MAC address (from outside the driver)
406 * @ndev: Pointer to the net_device structure
407 * @p: 6 byte Address to be written as MAC address
408 *
409 * Return: 0 for all conditions. Presently, there is no failure case.
410 *
411 * This function is called to initialize the MAC address of the Axi Ethernet
412 * core. It calls the core specific axienet_set_mac_address. This is the
413 * function that goes into net_device_ops structure entry ndo_set_mac_address.
414 */
415static int netdev_set_mac_address(struct net_device *ndev, void *p)
416{
417 struct sockaddr *addr = p;
418
419 axienet_set_mac_address(ndev, addr->sa_data);
420 return 0;
421}
422
423/**
424 * axienet_set_multicast_list - Prepare the multicast table
425 * @ndev: Pointer to the net_device structure
426 *
427 * This function is called to initialize the multicast table during
428 * initialization. The Axi Ethernet basic multicast support has a four-entry
429 * multicast table which is initialized here. Additionally this function
430 * goes into the net_device_ops structure entry ndo_set_multicast_list. This
431 * means whenever the multicast table entries need to be updated this
432 * function gets called.
433 */
434static void axienet_set_multicast_list(struct net_device *ndev)
435{
436 int i = 0;
437 u32 reg, af0reg, af1reg;
438 struct axienet_local *lp = netdev_priv(ndev);
439
440 reg = axienet_ior(lp, XAE_FMI_OFFSET);
441 reg &= ~XAE_FMI_PM_MASK;
442 if (ndev->flags & IFF_PROMISC)
443 reg |= XAE_FMI_PM_MASK;
444 else
445 reg &= ~XAE_FMI_PM_MASK;
446 axienet_iow(lp, XAE_FMI_OFFSET, reg);
447
448 if (ndev->flags & IFF_ALLMULTI ||
449 netdev_mc_count(ndev) > XAE_MULTICAST_CAM_TABLE_NUM) {
450 reg &= 0xFFFFFF00;
451 axienet_iow(lp, XAE_FMI_OFFSET, reg);
452 axienet_iow(lp, XAE_AF0_OFFSET, 1); /* Multicast bit */
453 axienet_iow(lp, XAE_AF1_OFFSET, 0);
454 axienet_iow(lp, XAE_AM0_OFFSET, 1); /* ditto */
455 axienet_iow(lp, XAE_AM1_OFFSET, 0);
456 axienet_iow(lp, XAE_FFE_OFFSET, 1);
457 i = 1;
458 } else if (!netdev_mc_empty(ndev)) {
459 struct netdev_hw_addr *ha;
460
461 netdev_for_each_mc_addr(ha, ndev) {
462 if (i >= XAE_MULTICAST_CAM_TABLE_NUM)
463 break;
464
465 af0reg = (ha->addr[0]);
466 af0reg |= (ha->addr[1] << 8);
467 af0reg |= (ha->addr[2] << 16);
468 af0reg |= (ha->addr[3] << 24);
469
470 af1reg = (ha->addr[4]);
471 af1reg |= (ha->addr[5] << 8);
472
473 reg &= 0xFFFFFF00;
474 reg |= i;
475
476 axienet_iow(lp, XAE_FMI_OFFSET, reg);
477 axienet_iow(lp, XAE_AF0_OFFSET, af0reg);
478 axienet_iow(lp, XAE_AF1_OFFSET, af1reg);
479 axienet_iow(lp, XAE_AM0_OFFSET, 0xffffffff);
480 axienet_iow(lp, XAE_AM1_OFFSET, 0x0000ffff);
481 axienet_iow(lp, XAE_FFE_OFFSET, 1);
482 i++;
483 }
484 }
485
486 for (; i < XAE_MULTICAST_CAM_TABLE_NUM; i++) {
487 reg &= 0xFFFFFF00;
488 reg |= i;
489 axienet_iow(lp, XAE_FMI_OFFSET, reg);
490 axienet_iow(lp, XAE_FFE_OFFSET, 0);
491 }
492}
493
494/**
495 * axienet_setoptions - Set an Axi Ethernet option
496 * @ndev: Pointer to the net_device structure
497 * @options: Option to be enabled/disabled
498 *
499 * The Axi Ethernet core has multiple features which can be selectively turned
500 * on or off. The typical options could be jumbo frame option, basic VLAN
501 * option, promiscuous mode option etc. This function is used to set or clear
502 * these options in the Axi Ethernet hardware. This is done through
503 * axienet_option structure .
504 */
505static void axienet_setoptions(struct net_device *ndev, u32 options)
506{
507 int reg;
508 struct axienet_local *lp = netdev_priv(ndev);
509 struct axienet_option *tp = &axienet_options[0];
510
511 while (tp->opt) {
512 reg = ((axienet_ior(lp, tp->reg)) & ~(tp->m_or));
513 if (options & tp->opt)
514 reg |= tp->m_or;
515 axienet_iow(lp, tp->reg, reg);
516 tp++;
517 }
518
519 lp->options |= options;
520}
521
522static u64 axienet_stat(struct axienet_local *lp, enum temac_stat stat)
523{
524 u32 counter;
525
526 if (lp->reset_in_progress)
527 return lp->hw_stat_base[stat];
528
529 counter = axienet_ior(lp, XAE_STATS_OFFSET + stat * 8);
530 return lp->hw_stat_base[stat] + (counter - lp->hw_last_counter[stat]);
531}
532
533static void axienet_stats_update(struct axienet_local *lp, bool reset)
534{
535 enum temac_stat stat;
536
537 write_seqcount_begin(&lp->hw_stats_seqcount);
538 lp->reset_in_progress = reset;
539 for (stat = 0; stat < STAT_COUNT; stat++) {
540 u32 counter = axienet_ior(lp, XAE_STATS_OFFSET + stat * 8);
541
542 lp->hw_stat_base[stat] += counter - lp->hw_last_counter[stat];
543 lp->hw_last_counter[stat] = counter;
544 }
545 write_seqcount_end(&lp->hw_stats_seqcount);
546}
547
548static void axienet_refresh_stats(struct work_struct *work)
549{
550 struct axienet_local *lp = container_of(work, struct axienet_local,
551 stats_work.work);
552
553 mutex_lock(&lp->stats_lock);
554 axienet_stats_update(lp, false);
555 mutex_unlock(&lp->stats_lock);
556
557 /* Just less than 2^32 bytes at 2.5 GBit/s */
558 schedule_delayed_work(&lp->stats_work, 13 * HZ);
559}
560
561static int __axienet_device_reset(struct axienet_local *lp)
562{
563 u32 value;
564 int ret;
565
566 /* Save statistics counters in case they will be reset */
567 mutex_lock(&lp->stats_lock);
568 if (lp->features & XAE_FEATURE_STATS)
569 axienet_stats_update(lp, true);
570
571 /* Reset Axi DMA. This would reset Axi Ethernet core as well. The reset
572 * process of Axi DMA takes a while to complete as all pending
573 * commands/transfers will be flushed or completed during this
574 * reset process.
575 * Note that even though both TX and RX have their own reset register,
576 * they both reset the entire DMA core, so only one needs to be used.
577 */
578 axienet_dma_out32(lp, XAXIDMA_TX_CR_OFFSET, XAXIDMA_CR_RESET_MASK);
579 ret = read_poll_timeout(axienet_dma_in32, value,
580 !(value & XAXIDMA_CR_RESET_MASK),
581 DELAY_OF_ONE_MILLISEC, 50000, false, lp,
582 XAXIDMA_TX_CR_OFFSET);
583 if (ret) {
584 dev_err(lp->dev, "%s: DMA reset timeout!\n", __func__);
585 goto out;
586 }
587
588 /* Wait for PhyRstCmplt bit to be set, indicating the PHY reset has finished */
589 ret = read_poll_timeout(axienet_ior, value,
590 value & XAE_INT_PHYRSTCMPLT_MASK,
591 DELAY_OF_ONE_MILLISEC, 50000, false, lp,
592 XAE_IS_OFFSET);
593 if (ret) {
594 dev_err(lp->dev, "%s: timeout waiting for PhyRstCmplt\n", __func__);
595 goto out;
596 }
597
598 /* Update statistics counters with new values */
599 if (lp->features & XAE_FEATURE_STATS) {
600 enum temac_stat stat;
601
602 write_seqcount_begin(&lp->hw_stats_seqcount);
603 lp->reset_in_progress = false;
604 for (stat = 0; stat < STAT_COUNT; stat++) {
605 u32 counter =
606 axienet_ior(lp, XAE_STATS_OFFSET + stat * 8);
607
608 lp->hw_stat_base[stat] +=
609 lp->hw_last_counter[stat] - counter;
610 lp->hw_last_counter[stat] = counter;
611 }
612 write_seqcount_end(&lp->hw_stats_seqcount);
613 }
614
615out:
616 mutex_unlock(&lp->stats_lock);
617 return ret;
618}
619
620/**
621 * axienet_dma_stop - Stop DMA operation
622 * @lp: Pointer to the axienet_local structure
623 */
624static void axienet_dma_stop(struct axienet_local *lp)
625{
626 int count;
627 u32 cr, sr;
628
629 cr = axienet_dma_in32(lp, XAXIDMA_RX_CR_OFFSET);
630 cr &= ~(XAXIDMA_CR_RUNSTOP_MASK | XAXIDMA_IRQ_ALL_MASK);
631 axienet_dma_out32(lp, XAXIDMA_RX_CR_OFFSET, cr);
632 synchronize_irq(lp->rx_irq);
633
634 cr = axienet_dma_in32(lp, XAXIDMA_TX_CR_OFFSET);
635 cr &= ~(XAXIDMA_CR_RUNSTOP_MASK | XAXIDMA_IRQ_ALL_MASK);
636 axienet_dma_out32(lp, XAXIDMA_TX_CR_OFFSET, cr);
637 synchronize_irq(lp->tx_irq);
638
639 /* Give DMAs a chance to halt gracefully */
640 sr = axienet_dma_in32(lp, XAXIDMA_RX_SR_OFFSET);
641 for (count = 0; !(sr & XAXIDMA_SR_HALT_MASK) && count < 5; ++count) {
642 msleep(20);
643 sr = axienet_dma_in32(lp, XAXIDMA_RX_SR_OFFSET);
644 }
645
646 sr = axienet_dma_in32(lp, XAXIDMA_TX_SR_OFFSET);
647 for (count = 0; !(sr & XAXIDMA_SR_HALT_MASK) && count < 5; ++count) {
648 msleep(20);
649 sr = axienet_dma_in32(lp, XAXIDMA_TX_SR_OFFSET);
650 }
651
652 /* Do a reset to ensure DMA is really stopped */
653 axienet_lock_mii(lp);
654 __axienet_device_reset(lp);
655 axienet_unlock_mii(lp);
656}
657
658/**
659 * axienet_device_reset - Reset and initialize the Axi Ethernet hardware.
660 * @ndev: Pointer to the net_device structure
661 *
662 * This function is called to reset and initialize the Axi Ethernet core. This
663 * is typically called during initialization. It does a reset of the Axi DMA
664 * Rx/Tx channels and initializes the Axi DMA BDs. Since Axi DMA reset lines
665 * are connected to Axi Ethernet reset lines, this in turn resets the Axi
666 * Ethernet core. No separate hardware reset is done for the Axi Ethernet
667 * core.
668 * Returns 0 on success or a negative error number otherwise.
669 */
670static int axienet_device_reset(struct net_device *ndev)
671{
672 u32 axienet_status;
673 struct axienet_local *lp = netdev_priv(ndev);
674 int ret;
675
676 lp->max_frm_size = XAE_MAX_VLAN_FRAME_SIZE;
677 lp->options |= XAE_OPTION_VLAN;
678 lp->options &= (~XAE_OPTION_JUMBO);
679
680 if (ndev->mtu > XAE_MTU && ndev->mtu <= XAE_JUMBO_MTU) {
681 lp->max_frm_size = ndev->mtu + VLAN_ETH_HLEN +
682 XAE_TRL_SIZE;
683
684 if (lp->max_frm_size <= lp->rxmem)
685 lp->options |= XAE_OPTION_JUMBO;
686 }
687
688 if (!lp->use_dmaengine) {
689 ret = __axienet_device_reset(lp);
690 if (ret)
691 return ret;
692
693 ret = axienet_dma_bd_init(ndev);
694 if (ret) {
695 netdev_err(ndev, "%s: descriptor allocation failed\n",
696 __func__);
697 return ret;
698 }
699 }
700
701 axienet_status = axienet_ior(lp, XAE_RCW1_OFFSET);
702 axienet_status &= ~XAE_RCW1_RX_MASK;
703 axienet_iow(lp, XAE_RCW1_OFFSET, axienet_status);
704
705 axienet_status = axienet_ior(lp, XAE_IP_OFFSET);
706 if (axienet_status & XAE_INT_RXRJECT_MASK)
707 axienet_iow(lp, XAE_IS_OFFSET, XAE_INT_RXRJECT_MASK);
708 axienet_iow(lp, XAE_IE_OFFSET, lp->eth_irq > 0 ?
709 XAE_INT_RECV_ERROR_MASK : 0);
710
711 axienet_iow(lp, XAE_FCC_OFFSET, XAE_FCC_FCRX_MASK);
712
713 /* Sync default options with HW but leave receiver and
714 * transmitter disabled.
715 */
716 axienet_setoptions(ndev, lp->options &
717 ~(XAE_OPTION_TXEN | XAE_OPTION_RXEN));
718 axienet_set_mac_address(ndev, NULL);
719 axienet_set_multicast_list(ndev);
720 axienet_setoptions(ndev, lp->options);
721
722 netif_trans_update(ndev);
723
724 return 0;
725}
726
727/**
728 * axienet_free_tx_chain - Clean up a series of linked TX descriptors.
729 * @lp: Pointer to the axienet_local structure
730 * @first_bd: Index of first descriptor to clean up
731 * @nr_bds: Max number of descriptors to clean up
732 * @force: Whether to clean descriptors even if not complete
733 * @sizep: Pointer to a u32 filled with the total sum of all bytes
734 * in all cleaned-up descriptors. Ignored if NULL.
735 * @budget: NAPI budget (use 0 when not called from NAPI poll)
736 *
737 * Would either be called after a successful transmit operation, or after
738 * there was an error when setting up the chain.
739 * Returns the number of packets handled.
740 */
741static int axienet_free_tx_chain(struct axienet_local *lp, u32 first_bd,
742 int nr_bds, bool force, u32 *sizep, int budget)
743{
744 struct axidma_bd *cur_p;
745 unsigned int status;
746 int i, packets = 0;
747 dma_addr_t phys;
748
749 for (i = 0; i < nr_bds; i++) {
750 cur_p = &lp->tx_bd_v[(first_bd + i) % lp->tx_bd_num];
751 status = cur_p->status;
752
753 /* If force is not specified, clean up only descriptors
754 * that have been completed by the MAC.
755 */
756 if (!force && !(status & XAXIDMA_BD_STS_COMPLETE_MASK))
757 break;
758
759 /* Ensure we see complete descriptor update */
760 dma_rmb();
761 phys = desc_get_phys_addr(lp, cur_p);
762 dma_unmap_single(lp->dev, phys,
763 (cur_p->cntrl & XAXIDMA_BD_CTRL_LENGTH_MASK),
764 DMA_TO_DEVICE);
765
766 if (cur_p->skb && (status & XAXIDMA_BD_STS_COMPLETE_MASK)) {
767 napi_consume_skb(cur_p->skb, budget);
768 packets++;
769 }
770
771 cur_p->app0 = 0;
772 cur_p->app1 = 0;
773 cur_p->app2 = 0;
774 cur_p->app4 = 0;
775 cur_p->skb = NULL;
776 /* ensure our transmit path and device don't prematurely see status cleared */
777 wmb();
778 cur_p->cntrl = 0;
779 cur_p->status = 0;
780
781 if (sizep)
782 *sizep += status & XAXIDMA_BD_STS_ACTUAL_LEN_MASK;
783 }
784
785 if (!force) {
786 lp->tx_bd_ci += i;
787 if (lp->tx_bd_ci >= lp->tx_bd_num)
788 lp->tx_bd_ci %= lp->tx_bd_num;
789 }
790
791 return packets;
792}
793
794/**
795 * axienet_check_tx_bd_space - Checks if a BD/group of BDs are currently busy
796 * @lp: Pointer to the axienet_local structure
797 * @num_frag: The number of BDs to check for
798 *
799 * Return: 0, on success
800 * NETDEV_TX_BUSY, if any of the descriptors are not free
801 *
802 * This function is invoked before BDs are allocated and transmission starts.
803 * This function returns 0 if a BD or group of BDs can be allocated for
804 * transmission. If the BD or any of the BDs are not free the function
805 * returns a busy status.
806 */
807static inline int axienet_check_tx_bd_space(struct axienet_local *lp,
808 int num_frag)
809{
810 struct axidma_bd *cur_p;
811
812 /* Ensure we see all descriptor updates from device or TX polling */
813 rmb();
814 cur_p = &lp->tx_bd_v[(READ_ONCE(lp->tx_bd_tail) + num_frag) %
815 lp->tx_bd_num];
816 if (cur_p->cntrl)
817 return NETDEV_TX_BUSY;
818 return 0;
819}
820
821/**
822 * axienet_dma_tx_cb - DMA engine callback for TX channel.
823 * @data: Pointer to the axienet_local structure.
824 * @result: error reporting through dmaengine_result.
825 * This function is called by dmaengine driver for TX channel to notify
826 * that the transmit is done.
827 */
828static void axienet_dma_tx_cb(void *data, const struct dmaengine_result *result)
829{
830 struct skbuf_dma_descriptor *skbuf_dma;
831 struct axienet_local *lp = data;
832 struct netdev_queue *txq;
833 int len;
834
835 skbuf_dma = axienet_get_tx_desc(lp, lp->tx_ring_tail++);
836 len = skbuf_dma->skb->len;
837 txq = skb_get_tx_queue(lp->ndev, skbuf_dma->skb);
838 u64_stats_update_begin(&lp->tx_stat_sync);
839 u64_stats_add(&lp->tx_bytes, len);
840 u64_stats_add(&lp->tx_packets, 1);
841 u64_stats_update_end(&lp->tx_stat_sync);
842 dma_unmap_sg(lp->dev, skbuf_dma->sgl, skbuf_dma->sg_len, DMA_TO_DEVICE);
843 dev_consume_skb_any(skbuf_dma->skb);
844 netif_txq_completed_wake(txq, 1, len,
845 CIRC_SPACE(lp->tx_ring_head, lp->tx_ring_tail, TX_BD_NUM_MAX),
846 2 * MAX_SKB_FRAGS);
847}
848
849/**
850 * axienet_start_xmit_dmaengine - Starts the transmission.
851 * @skb: sk_buff pointer that contains data to be Txed.
852 * @ndev: Pointer to net_device structure.
853 *
854 * Return: NETDEV_TX_OK on success or any non space errors.
855 * NETDEV_TX_BUSY when free element in TX skb ring buffer
856 * is not available.
857 *
858 * This function is invoked to initiate transmission. The
859 * function sets the skbs, register dma callback API and submit
860 * the dma transaction.
861 * Additionally if checksum offloading is supported,
862 * it populates AXI Stream Control fields with appropriate values.
863 */
864static netdev_tx_t
865axienet_start_xmit_dmaengine(struct sk_buff *skb, struct net_device *ndev)
866{
867 struct dma_async_tx_descriptor *dma_tx_desc = NULL;
868 struct axienet_local *lp = netdev_priv(ndev);
869 u32 app_metadata[DMA_NUM_APP_WORDS] = {0};
870 struct skbuf_dma_descriptor *skbuf_dma;
871 struct dma_device *dma_dev;
872 struct netdev_queue *txq;
873 u32 csum_start_off;
874 u32 csum_index_off;
875 int sg_len;
876 int ret;
877
878 dma_dev = lp->tx_chan->device;
879 sg_len = skb_shinfo(skb)->nr_frags + 1;
880 if (CIRC_SPACE(lp->tx_ring_head, lp->tx_ring_tail, TX_BD_NUM_MAX) <= sg_len) {
881 netif_stop_queue(ndev);
882 if (net_ratelimit())
883 netdev_warn(ndev, "TX ring unexpectedly full\n");
884 return NETDEV_TX_BUSY;
885 }
886
887 skbuf_dma = axienet_get_tx_desc(lp, lp->tx_ring_head);
888 if (!skbuf_dma)
889 goto xmit_error_drop_skb;
890
891 lp->tx_ring_head++;
892 sg_init_table(skbuf_dma->sgl, sg_len);
893 ret = skb_to_sgvec(skb, skbuf_dma->sgl, 0, skb->len);
894 if (ret < 0)
895 goto xmit_error_drop_skb;
896
897 ret = dma_map_sg(lp->dev, skbuf_dma->sgl, sg_len, DMA_TO_DEVICE);
898 if (!ret)
899 goto xmit_error_drop_skb;
900
901 /* Fill up app fields for checksum */
902 if (skb->ip_summed == CHECKSUM_PARTIAL) {
903 if (lp->features & XAE_FEATURE_FULL_TX_CSUM) {
904 /* Tx Full Checksum Offload Enabled */
905 app_metadata[0] |= 2;
906 } else if (lp->features & XAE_FEATURE_PARTIAL_TX_CSUM) {
907 csum_start_off = skb_transport_offset(skb);
908 csum_index_off = csum_start_off + skb->csum_offset;
909 /* Tx Partial Checksum Offload Enabled */
910 app_metadata[0] |= 1;
911 app_metadata[1] = (csum_start_off << 16) | csum_index_off;
912 }
913 } else if (skb->ip_summed == CHECKSUM_UNNECESSARY) {
914 app_metadata[0] |= 2; /* Tx Full Checksum Offload Enabled */
915 }
916
917 dma_tx_desc = dma_dev->device_prep_slave_sg(lp->tx_chan, skbuf_dma->sgl,
918 sg_len, DMA_MEM_TO_DEV,
919 DMA_PREP_INTERRUPT, (void *)app_metadata);
920 if (!dma_tx_desc)
921 goto xmit_error_unmap_sg;
922
923 skbuf_dma->skb = skb;
924 skbuf_dma->sg_len = sg_len;
925 dma_tx_desc->callback_param = lp;
926 dma_tx_desc->callback_result = axienet_dma_tx_cb;
927 txq = skb_get_tx_queue(lp->ndev, skb);
928 netdev_tx_sent_queue(txq, skb->len);
929 netif_txq_maybe_stop(txq, CIRC_SPACE(lp->tx_ring_head, lp->tx_ring_tail, TX_BD_NUM_MAX),
930 MAX_SKB_FRAGS + 1, 2 * MAX_SKB_FRAGS);
931
932 dmaengine_submit(dma_tx_desc);
933 dma_async_issue_pending(lp->tx_chan);
934 return NETDEV_TX_OK;
935
936xmit_error_unmap_sg:
937 dma_unmap_sg(lp->dev, skbuf_dma->sgl, sg_len, DMA_TO_DEVICE);
938xmit_error_drop_skb:
939 dev_kfree_skb_any(skb);
940 return NETDEV_TX_OK;
941}
942
943/**
944 * axienet_tx_poll - Invoked once a transmit is completed by the
945 * Axi DMA Tx channel.
946 * @napi: Pointer to NAPI structure.
947 * @budget: Max number of TX packets to process.
948 *
949 * Return: Number of TX packets processed.
950 *
951 * This function is invoked from the NAPI processing to notify the completion
952 * of transmit operation. It clears fields in the corresponding Tx BDs and
953 * unmaps the corresponding buffer so that CPU can regain ownership of the
954 * buffer. It finally invokes "netif_wake_queue" to restart transmission if
955 * required.
956 */
957static int axienet_tx_poll(struct napi_struct *napi, int budget)
958{
959 struct axienet_local *lp = container_of(napi, struct axienet_local, napi_tx);
960 struct net_device *ndev = lp->ndev;
961 u32 size = 0;
962 int packets;
963
964 packets = axienet_free_tx_chain(lp, lp->tx_bd_ci, lp->tx_bd_num, false,
965 &size, budget);
966
967 if (packets) {
968 u64_stats_update_begin(&lp->tx_stat_sync);
969 u64_stats_add(&lp->tx_packets, packets);
970 u64_stats_add(&lp->tx_bytes, size);
971 u64_stats_update_end(&lp->tx_stat_sync);
972
973 /* Matches barrier in axienet_start_xmit */
974 smp_mb();
975
976 if (!axienet_check_tx_bd_space(lp, MAX_SKB_FRAGS + 1))
977 netif_wake_queue(ndev);
978 }
979
980 if (packets < budget && napi_complete_done(napi, packets)) {
981 /* Re-enable TX completion interrupts. This should
982 * cause an immediate interrupt if any TX packets are
983 * already pending.
984 */
985 axienet_dma_out32(lp, XAXIDMA_TX_CR_OFFSET, lp->tx_dma_cr);
986 }
987 return packets;
988}
989
990/**
991 * axienet_start_xmit - Starts the transmission.
992 * @skb: sk_buff pointer that contains data to be Txed.
993 * @ndev: Pointer to net_device structure.
994 *
995 * Return: NETDEV_TX_OK, on success
996 * NETDEV_TX_BUSY, if any of the descriptors are not free
997 *
998 * This function is invoked from upper layers to initiate transmission. The
999 * function uses the next available free BDs and populates their fields to
1000 * start the transmission. Additionally if checksum offloading is supported,
1001 * it populates AXI Stream Control fields with appropriate values.
1002 */
1003static netdev_tx_t
1004axienet_start_xmit(struct sk_buff *skb, struct net_device *ndev)
1005{
1006 u32 ii;
1007 u32 num_frag;
1008 u32 csum_start_off;
1009 u32 csum_index_off;
1010 skb_frag_t *frag;
1011 dma_addr_t tail_p, phys;
1012 u32 orig_tail_ptr, new_tail_ptr;
1013 struct axienet_local *lp = netdev_priv(ndev);
1014 struct axidma_bd *cur_p;
1015
1016 orig_tail_ptr = lp->tx_bd_tail;
1017 new_tail_ptr = orig_tail_ptr;
1018
1019 num_frag = skb_shinfo(skb)->nr_frags;
1020 cur_p = &lp->tx_bd_v[orig_tail_ptr];
1021
1022 if (axienet_check_tx_bd_space(lp, num_frag + 1)) {
1023 /* Should not happen as last start_xmit call should have
1024 * checked for sufficient space and queue should only be
1025 * woken when sufficient space is available.
1026 */
1027 netif_stop_queue(ndev);
1028 if (net_ratelimit())
1029 netdev_warn(ndev, "TX ring unexpectedly full\n");
1030 return NETDEV_TX_BUSY;
1031 }
1032
1033 if (skb->ip_summed == CHECKSUM_PARTIAL) {
1034 if (lp->features & XAE_FEATURE_FULL_TX_CSUM) {
1035 /* Tx Full Checksum Offload Enabled */
1036 cur_p->app0 |= 2;
1037 } else if (lp->features & XAE_FEATURE_PARTIAL_TX_CSUM) {
1038 csum_start_off = skb_transport_offset(skb);
1039 csum_index_off = csum_start_off + skb->csum_offset;
1040 /* Tx Partial Checksum Offload Enabled */
1041 cur_p->app0 |= 1;
1042 cur_p->app1 = (csum_start_off << 16) | csum_index_off;
1043 }
1044 } else if (skb->ip_summed == CHECKSUM_UNNECESSARY) {
1045 cur_p->app0 |= 2; /* Tx Full Checksum Offload Enabled */
1046 }
1047
1048 phys = dma_map_single(lp->dev, skb->data,
1049 skb_headlen(skb), DMA_TO_DEVICE);
1050 if (unlikely(dma_mapping_error(lp->dev, phys))) {
1051 if (net_ratelimit())
1052 netdev_err(ndev, "TX DMA mapping error\n");
1053 ndev->stats.tx_dropped++;
1054 dev_kfree_skb_any(skb);
1055 return NETDEV_TX_OK;
1056 }
1057 desc_set_phys_addr(lp, phys, cur_p);
1058 cur_p->cntrl = skb_headlen(skb) | XAXIDMA_BD_CTRL_TXSOF_MASK;
1059
1060 for (ii = 0; ii < num_frag; ii++) {
1061 if (++new_tail_ptr >= lp->tx_bd_num)
1062 new_tail_ptr = 0;
1063 cur_p = &lp->tx_bd_v[new_tail_ptr];
1064 frag = &skb_shinfo(skb)->frags[ii];
1065 phys = dma_map_single(lp->dev,
1066 skb_frag_address(frag),
1067 skb_frag_size(frag),
1068 DMA_TO_DEVICE);
1069 if (unlikely(dma_mapping_error(lp->dev, phys))) {
1070 if (net_ratelimit())
1071 netdev_err(ndev, "TX DMA mapping error\n");
1072 ndev->stats.tx_dropped++;
1073 axienet_free_tx_chain(lp, orig_tail_ptr, ii + 1,
1074 true, NULL, 0);
1075 dev_kfree_skb_any(skb);
1076 return NETDEV_TX_OK;
1077 }
1078 desc_set_phys_addr(lp, phys, cur_p);
1079 cur_p->cntrl = skb_frag_size(frag);
1080 }
1081
1082 cur_p->cntrl |= XAXIDMA_BD_CTRL_TXEOF_MASK;
1083 cur_p->skb = skb;
1084
1085 tail_p = lp->tx_bd_p + sizeof(*lp->tx_bd_v) * new_tail_ptr;
1086 if (++new_tail_ptr >= lp->tx_bd_num)
1087 new_tail_ptr = 0;
1088 WRITE_ONCE(lp->tx_bd_tail, new_tail_ptr);
1089
1090 /* Start the transfer */
1091 axienet_dma_out_addr(lp, XAXIDMA_TX_TDESC_OFFSET, tail_p);
1092
1093 /* Stop queue if next transmit may not have space */
1094 if (axienet_check_tx_bd_space(lp, MAX_SKB_FRAGS + 1)) {
1095 netif_stop_queue(ndev);
1096
1097 /* Matches barrier in axienet_tx_poll */
1098 smp_mb();
1099
1100 /* Space might have just been freed - check again */
1101 if (!axienet_check_tx_bd_space(lp, MAX_SKB_FRAGS + 1))
1102 netif_wake_queue(ndev);
1103 }
1104
1105 return NETDEV_TX_OK;
1106}
1107
1108/**
1109 * axienet_dma_rx_cb - DMA engine callback for RX channel.
1110 * @data: Pointer to the skbuf_dma_descriptor structure.
1111 * @result: error reporting through dmaengine_result.
1112 * This function is called by dmaengine driver for RX channel to notify
1113 * that the packet is received.
1114 */
1115static void axienet_dma_rx_cb(void *data, const struct dmaengine_result *result)
1116{
1117 struct skbuf_dma_descriptor *skbuf_dma;
1118 size_t meta_len, meta_max_len, rx_len;
1119 struct axienet_local *lp = data;
1120 struct sk_buff *skb;
1121 u32 *app_metadata;
1122
1123 skbuf_dma = axienet_get_rx_desc(lp, lp->rx_ring_tail++);
1124 skb = skbuf_dma->skb;
1125 app_metadata = dmaengine_desc_get_metadata_ptr(skbuf_dma->desc, &meta_len,
1126 &meta_max_len);
1127 dma_unmap_single(lp->dev, skbuf_dma->dma_address, lp->max_frm_size,
1128 DMA_FROM_DEVICE);
1129 /* TODO: Derive app word index programmatically */
1130 rx_len = (app_metadata[LEN_APP] & 0xFFFF);
1131 skb_put(skb, rx_len);
1132 skb->protocol = eth_type_trans(skb, lp->ndev);
1133 skb->ip_summed = CHECKSUM_NONE;
1134
1135 __netif_rx(skb);
1136 u64_stats_update_begin(&lp->rx_stat_sync);
1137 u64_stats_add(&lp->rx_packets, 1);
1138 u64_stats_add(&lp->rx_bytes, rx_len);
1139 u64_stats_update_end(&lp->rx_stat_sync);
1140 axienet_rx_submit_desc(lp->ndev);
1141 dma_async_issue_pending(lp->rx_chan);
1142}
1143
1144/**
1145 * axienet_rx_poll - Triggered by RX ISR to complete the BD processing.
1146 * @napi: Pointer to NAPI structure.
1147 * @budget: Max number of RX packets to process.
1148 *
1149 * Return: Number of RX packets processed.
1150 */
1151static int axienet_rx_poll(struct napi_struct *napi, int budget)
1152{
1153 u32 length;
1154 u32 csumstatus;
1155 u32 size = 0;
1156 int packets = 0;
1157 dma_addr_t tail_p = 0;
1158 struct axidma_bd *cur_p;
1159 struct sk_buff *skb, *new_skb;
1160 struct axienet_local *lp = container_of(napi, struct axienet_local, napi_rx);
1161
1162 cur_p = &lp->rx_bd_v[lp->rx_bd_ci];
1163
1164 while (packets < budget && (cur_p->status & XAXIDMA_BD_STS_COMPLETE_MASK)) {
1165 dma_addr_t phys;
1166
1167 /* Ensure we see complete descriptor update */
1168 dma_rmb();
1169
1170 skb = cur_p->skb;
1171 cur_p->skb = NULL;
1172
1173 /* skb could be NULL if a previous pass already received the
1174 * packet for this slot in the ring, but failed to refill it
1175 * with a newly allocated buffer. In this case, don't try to
1176 * receive it again.
1177 */
1178 if (likely(skb)) {
1179 length = cur_p->app4 & 0x0000FFFF;
1180
1181 phys = desc_get_phys_addr(lp, cur_p);
1182 dma_unmap_single(lp->dev, phys, lp->max_frm_size,
1183 DMA_FROM_DEVICE);
1184
1185 skb_put(skb, length);
1186 skb->protocol = eth_type_trans(skb, lp->ndev);
1187 /*skb_checksum_none_assert(skb);*/
1188 skb->ip_summed = CHECKSUM_NONE;
1189
1190 /* if we're doing Rx csum offload, set it up */
1191 if (lp->features & XAE_FEATURE_FULL_RX_CSUM) {
1192 csumstatus = (cur_p->app2 &
1193 XAE_FULL_CSUM_STATUS_MASK) >> 3;
1194 if (csumstatus == XAE_IP_TCP_CSUM_VALIDATED ||
1195 csumstatus == XAE_IP_UDP_CSUM_VALIDATED) {
1196 skb->ip_summed = CHECKSUM_UNNECESSARY;
1197 }
1198 } else if (lp->features & XAE_FEATURE_PARTIAL_RX_CSUM) {
1199 skb->csum = be32_to_cpu(cur_p->app3 & 0xFFFF);
1200 skb->ip_summed = CHECKSUM_COMPLETE;
1201 }
1202
1203 napi_gro_receive(napi, skb);
1204
1205 size += length;
1206 packets++;
1207 }
1208
1209 new_skb = napi_alloc_skb(napi, lp->max_frm_size);
1210 if (!new_skb)
1211 break;
1212
1213 phys = dma_map_single(lp->dev, new_skb->data,
1214 lp->max_frm_size,
1215 DMA_FROM_DEVICE);
1216 if (unlikely(dma_mapping_error(lp->dev, phys))) {
1217 if (net_ratelimit())
1218 netdev_err(lp->ndev, "RX DMA mapping error\n");
1219 dev_kfree_skb(new_skb);
1220 break;
1221 }
1222 desc_set_phys_addr(lp, phys, cur_p);
1223
1224 cur_p->cntrl = lp->max_frm_size;
1225 cur_p->status = 0;
1226 cur_p->skb = new_skb;
1227
1228 /* Only update tail_p to mark this slot as usable after it has
1229 * been successfully refilled.
1230 */
1231 tail_p = lp->rx_bd_p + sizeof(*lp->rx_bd_v) * lp->rx_bd_ci;
1232
1233 if (++lp->rx_bd_ci >= lp->rx_bd_num)
1234 lp->rx_bd_ci = 0;
1235 cur_p = &lp->rx_bd_v[lp->rx_bd_ci];
1236 }
1237
1238 u64_stats_update_begin(&lp->rx_stat_sync);
1239 u64_stats_add(&lp->rx_packets, packets);
1240 u64_stats_add(&lp->rx_bytes, size);
1241 u64_stats_update_end(&lp->rx_stat_sync);
1242
1243 if (tail_p)
1244 axienet_dma_out_addr(lp, XAXIDMA_RX_TDESC_OFFSET, tail_p);
1245
1246 if (packets < budget && napi_complete_done(napi, packets)) {
1247 /* Re-enable RX completion interrupts. This should
1248 * cause an immediate interrupt if any RX packets are
1249 * already pending.
1250 */
1251 axienet_dma_out32(lp, XAXIDMA_RX_CR_OFFSET, lp->rx_dma_cr);
1252 }
1253 return packets;
1254}
1255
1256/**
1257 * axienet_tx_irq - Tx Done Isr.
1258 * @irq: irq number
1259 * @_ndev: net_device pointer
1260 *
1261 * Return: IRQ_HANDLED if device generated a TX interrupt, IRQ_NONE otherwise.
1262 *
1263 * This is the Axi DMA Tx done Isr. It invokes NAPI polling to complete the
1264 * TX BD processing.
1265 */
1266static irqreturn_t axienet_tx_irq(int irq, void *_ndev)
1267{
1268 unsigned int status;
1269 struct net_device *ndev = _ndev;
1270 struct axienet_local *lp = netdev_priv(ndev);
1271
1272 status = axienet_dma_in32(lp, XAXIDMA_TX_SR_OFFSET);
1273
1274 if (!(status & XAXIDMA_IRQ_ALL_MASK))
1275 return IRQ_NONE;
1276
1277 axienet_dma_out32(lp, XAXIDMA_TX_SR_OFFSET, status);
1278
1279 if (unlikely(status & XAXIDMA_IRQ_ERROR_MASK)) {
1280 netdev_err(ndev, "DMA Tx error 0x%x\n", status);
1281 netdev_err(ndev, "Current BD is at: 0x%x%08x\n",
1282 (lp->tx_bd_v[lp->tx_bd_ci]).phys_msb,
1283 (lp->tx_bd_v[lp->tx_bd_ci]).phys);
1284 schedule_work(&lp->dma_err_task);
1285 } else {
1286 /* Disable further TX completion interrupts and schedule
1287 * NAPI to handle the completions.
1288 */
1289 u32 cr = lp->tx_dma_cr;
1290
1291 cr &= ~(XAXIDMA_IRQ_IOC_MASK | XAXIDMA_IRQ_DELAY_MASK);
1292 if (napi_schedule_prep(&lp->napi_tx)) {
1293 axienet_dma_out32(lp, XAXIDMA_TX_CR_OFFSET, cr);
1294 __napi_schedule(&lp->napi_tx);
1295 }
1296 }
1297
1298 return IRQ_HANDLED;
1299}
1300
1301/**
1302 * axienet_rx_irq - Rx Isr.
1303 * @irq: irq number
1304 * @_ndev: net_device pointer
1305 *
1306 * Return: IRQ_HANDLED if device generated a RX interrupt, IRQ_NONE otherwise.
1307 *
1308 * This is the Axi DMA Rx Isr. It invokes NAPI polling to complete the RX BD
1309 * processing.
1310 */
1311static irqreturn_t axienet_rx_irq(int irq, void *_ndev)
1312{
1313 unsigned int status;
1314 struct net_device *ndev = _ndev;
1315 struct axienet_local *lp = netdev_priv(ndev);
1316
1317 status = axienet_dma_in32(lp, XAXIDMA_RX_SR_OFFSET);
1318
1319 if (!(status & XAXIDMA_IRQ_ALL_MASK))
1320 return IRQ_NONE;
1321
1322 axienet_dma_out32(lp, XAXIDMA_RX_SR_OFFSET, status);
1323
1324 if (unlikely(status & XAXIDMA_IRQ_ERROR_MASK)) {
1325 netdev_err(ndev, "DMA Rx error 0x%x\n", status);
1326 netdev_err(ndev, "Current BD is at: 0x%x%08x\n",
1327 (lp->rx_bd_v[lp->rx_bd_ci]).phys_msb,
1328 (lp->rx_bd_v[lp->rx_bd_ci]).phys);
1329 schedule_work(&lp->dma_err_task);
1330 } else {
1331 /* Disable further RX completion interrupts and schedule
1332 * NAPI receive.
1333 */
1334 u32 cr = lp->rx_dma_cr;
1335
1336 cr &= ~(XAXIDMA_IRQ_IOC_MASK | XAXIDMA_IRQ_DELAY_MASK);
1337 if (napi_schedule_prep(&lp->napi_rx)) {
1338 axienet_dma_out32(lp, XAXIDMA_RX_CR_OFFSET, cr);
1339 __napi_schedule(&lp->napi_rx);
1340 }
1341 }
1342
1343 return IRQ_HANDLED;
1344}
1345
1346/**
1347 * axienet_eth_irq - Ethernet core Isr.
1348 * @irq: irq number
1349 * @_ndev: net_device pointer
1350 *
1351 * Return: IRQ_HANDLED if device generated a core interrupt, IRQ_NONE otherwise.
1352 *
1353 * Handle miscellaneous conditions indicated by Ethernet core IRQ.
1354 */
1355static irqreturn_t axienet_eth_irq(int irq, void *_ndev)
1356{
1357 struct net_device *ndev = _ndev;
1358 struct axienet_local *lp = netdev_priv(ndev);
1359 unsigned int pending;
1360
1361 pending = axienet_ior(lp, XAE_IP_OFFSET);
1362 if (!pending)
1363 return IRQ_NONE;
1364
1365 if (pending & XAE_INT_RXFIFOOVR_MASK)
1366 ndev->stats.rx_missed_errors++;
1367
1368 if (pending & XAE_INT_RXRJECT_MASK)
1369 ndev->stats.rx_dropped++;
1370
1371 axienet_iow(lp, XAE_IS_OFFSET, pending);
1372 return IRQ_HANDLED;
1373}
1374
1375static void axienet_dma_err_handler(struct work_struct *work);
1376
1377/**
1378 * axienet_rx_submit_desc - Submit the rx descriptors to dmaengine.
1379 * allocate skbuff, map the scatterlist and obtain a descriptor
1380 * and then add the callback information and submit descriptor.
1381 *
1382 * @ndev: net_device pointer
1383 *
1384 */
1385static void axienet_rx_submit_desc(struct net_device *ndev)
1386{
1387 struct dma_async_tx_descriptor *dma_rx_desc = NULL;
1388 struct axienet_local *lp = netdev_priv(ndev);
1389 struct skbuf_dma_descriptor *skbuf_dma;
1390 struct sk_buff *skb;
1391 dma_addr_t addr;
1392
1393 skbuf_dma = axienet_get_rx_desc(lp, lp->rx_ring_head);
1394 if (!skbuf_dma)
1395 return;
1396
1397 lp->rx_ring_head++;
1398 skb = netdev_alloc_skb(ndev, lp->max_frm_size);
1399 if (!skb)
1400 return;
1401
1402 sg_init_table(skbuf_dma->sgl, 1);
1403 addr = dma_map_single(lp->dev, skb->data, lp->max_frm_size, DMA_FROM_DEVICE);
1404 if (unlikely(dma_mapping_error(lp->dev, addr))) {
1405 if (net_ratelimit())
1406 netdev_err(ndev, "DMA mapping error\n");
1407 goto rx_submit_err_free_skb;
1408 }
1409 sg_dma_address(skbuf_dma->sgl) = addr;
1410 sg_dma_len(skbuf_dma->sgl) = lp->max_frm_size;
1411 dma_rx_desc = dmaengine_prep_slave_sg(lp->rx_chan, skbuf_dma->sgl,
1412 1, DMA_DEV_TO_MEM,
1413 DMA_PREP_INTERRUPT);
1414 if (!dma_rx_desc)
1415 goto rx_submit_err_unmap_skb;
1416
1417 skbuf_dma->skb = skb;
1418 skbuf_dma->dma_address = sg_dma_address(skbuf_dma->sgl);
1419 skbuf_dma->desc = dma_rx_desc;
1420 dma_rx_desc->callback_param = lp;
1421 dma_rx_desc->callback_result = axienet_dma_rx_cb;
1422 dmaengine_submit(dma_rx_desc);
1423
1424 return;
1425
1426rx_submit_err_unmap_skb:
1427 dma_unmap_single(lp->dev, addr, lp->max_frm_size, DMA_FROM_DEVICE);
1428rx_submit_err_free_skb:
1429 dev_kfree_skb(skb);
1430}
1431
1432/**
1433 * axienet_init_dmaengine - init the dmaengine code.
1434 * @ndev: Pointer to net_device structure
1435 *
1436 * Return: 0, on success.
1437 * non-zero error value on failure
1438 *
1439 * This is the dmaengine initialization code.
1440 */
1441static int axienet_init_dmaengine(struct net_device *ndev)
1442{
1443 struct axienet_local *lp = netdev_priv(ndev);
1444 struct skbuf_dma_descriptor *skbuf_dma;
1445 int i, ret;
1446
1447 lp->tx_chan = dma_request_chan(lp->dev, "tx_chan0");
1448 if (IS_ERR(lp->tx_chan)) {
1449 dev_err(lp->dev, "No Ethernet DMA (TX) channel found\n");
1450 return PTR_ERR(lp->tx_chan);
1451 }
1452
1453 lp->rx_chan = dma_request_chan(lp->dev, "rx_chan0");
1454 if (IS_ERR(lp->rx_chan)) {
1455 ret = PTR_ERR(lp->rx_chan);
1456 dev_err(lp->dev, "No Ethernet DMA (RX) channel found\n");
1457 goto err_dma_release_tx;
1458 }
1459
1460 lp->tx_ring_tail = 0;
1461 lp->tx_ring_head = 0;
1462 lp->rx_ring_tail = 0;
1463 lp->rx_ring_head = 0;
1464 lp->tx_skb_ring = kcalloc(TX_BD_NUM_MAX, sizeof(*lp->tx_skb_ring),
1465 GFP_KERNEL);
1466 if (!lp->tx_skb_ring) {
1467 ret = -ENOMEM;
1468 goto err_dma_release_rx;
1469 }
1470 for (i = 0; i < TX_BD_NUM_MAX; i++) {
1471 skbuf_dma = kzalloc(sizeof(*skbuf_dma), GFP_KERNEL);
1472 if (!skbuf_dma) {
1473 ret = -ENOMEM;
1474 goto err_free_tx_skb_ring;
1475 }
1476 lp->tx_skb_ring[i] = skbuf_dma;
1477 }
1478
1479 lp->rx_skb_ring = kcalloc(RX_BUF_NUM_DEFAULT, sizeof(*lp->rx_skb_ring),
1480 GFP_KERNEL);
1481 if (!lp->rx_skb_ring) {
1482 ret = -ENOMEM;
1483 goto err_free_tx_skb_ring;
1484 }
1485 for (i = 0; i < RX_BUF_NUM_DEFAULT; i++) {
1486 skbuf_dma = kzalloc(sizeof(*skbuf_dma), GFP_KERNEL);
1487 if (!skbuf_dma) {
1488 ret = -ENOMEM;
1489 goto err_free_rx_skb_ring;
1490 }
1491 lp->rx_skb_ring[i] = skbuf_dma;
1492 }
1493 /* TODO: Instead of BD_NUM_DEFAULT use runtime support */
1494 for (i = 0; i < RX_BUF_NUM_DEFAULT; i++)
1495 axienet_rx_submit_desc(ndev);
1496 dma_async_issue_pending(lp->rx_chan);
1497
1498 return 0;
1499
1500err_free_rx_skb_ring:
1501 for (i = 0; i < RX_BUF_NUM_DEFAULT; i++)
1502 kfree(lp->rx_skb_ring[i]);
1503 kfree(lp->rx_skb_ring);
1504err_free_tx_skb_ring:
1505 for (i = 0; i < TX_BD_NUM_MAX; i++)
1506 kfree(lp->tx_skb_ring[i]);
1507 kfree(lp->tx_skb_ring);
1508err_dma_release_rx:
1509 dma_release_channel(lp->rx_chan);
1510err_dma_release_tx:
1511 dma_release_channel(lp->tx_chan);
1512 return ret;
1513}
1514
1515/**
1516 * axienet_init_legacy_dma - init the dma legacy code.
1517 * @ndev: Pointer to net_device structure
1518 *
1519 * Return: 0, on success.
1520 * non-zero error value on failure
1521 *
1522 * This is the dma initialization code. It also allocates interrupt
1523 * service routines, enables the interrupt lines and ISR handling.
1524 *
1525 */
1526static int axienet_init_legacy_dma(struct net_device *ndev)
1527{
1528 int ret;
1529 struct axienet_local *lp = netdev_priv(ndev);
1530
1531 /* Enable worker thread for Axi DMA error handling */
1532 lp->stopping = false;
1533 INIT_WORK(&lp->dma_err_task, axienet_dma_err_handler);
1534
1535 napi_enable(&lp->napi_rx);
1536 napi_enable(&lp->napi_tx);
1537
1538 /* Enable interrupts for Axi DMA Tx */
1539 ret = request_irq(lp->tx_irq, axienet_tx_irq, IRQF_SHARED,
1540 ndev->name, ndev);
1541 if (ret)
1542 goto err_tx_irq;
1543 /* Enable interrupts for Axi DMA Rx */
1544 ret = request_irq(lp->rx_irq, axienet_rx_irq, IRQF_SHARED,
1545 ndev->name, ndev);
1546 if (ret)
1547 goto err_rx_irq;
1548 /* Enable interrupts for Axi Ethernet core (if defined) */
1549 if (lp->eth_irq > 0) {
1550 ret = request_irq(lp->eth_irq, axienet_eth_irq, IRQF_SHARED,
1551 ndev->name, ndev);
1552 if (ret)
1553 goto err_eth_irq;
1554 }
1555
1556 return 0;
1557
1558err_eth_irq:
1559 free_irq(lp->rx_irq, ndev);
1560err_rx_irq:
1561 free_irq(lp->tx_irq, ndev);
1562err_tx_irq:
1563 napi_disable(&lp->napi_tx);
1564 napi_disable(&lp->napi_rx);
1565 cancel_work_sync(&lp->dma_err_task);
1566 dev_err(lp->dev, "request_irq() failed\n");
1567 return ret;
1568}
1569
1570/**
1571 * axienet_open - Driver open routine.
1572 * @ndev: Pointer to net_device structure
1573 *
1574 * Return: 0, on success.
1575 * non-zero error value on failure
1576 *
1577 * This is the driver open routine. It calls phylink_start to start the
1578 * PHY device.
1579 * It also allocates interrupt service routines, enables the interrupt lines
1580 * and ISR handling. Axi Ethernet core is reset through Axi DMA core. Buffer
1581 * descriptors are initialized.
1582 */
1583static int axienet_open(struct net_device *ndev)
1584{
1585 int ret;
1586 struct axienet_local *lp = netdev_priv(ndev);
1587
1588 /* When we do an Axi Ethernet reset, it resets the complete core
1589 * including the MDIO. MDIO must be disabled before resetting.
1590 * Hold MDIO bus lock to avoid MDIO accesses during the reset.
1591 */
1592 axienet_lock_mii(lp);
1593 ret = axienet_device_reset(ndev);
1594 axienet_unlock_mii(lp);
1595
1596 ret = phylink_of_phy_connect(lp->phylink, lp->dev->of_node, 0);
1597 if (ret) {
1598 dev_err(lp->dev, "phylink_of_phy_connect() failed: %d\n", ret);
1599 return ret;
1600 }
1601
1602 phylink_start(lp->phylink);
1603
1604 /* Start the statistics refresh work */
1605 schedule_delayed_work(&lp->stats_work, 0);
1606
1607 if (lp->use_dmaengine) {
1608 /* Enable interrupts for Axi Ethernet core (if defined) */
1609 if (lp->eth_irq > 0) {
1610 ret = request_irq(lp->eth_irq, axienet_eth_irq, IRQF_SHARED,
1611 ndev->name, ndev);
1612 if (ret)
1613 goto err_phy;
1614 }
1615
1616 ret = axienet_init_dmaengine(ndev);
1617 if (ret < 0)
1618 goto err_free_eth_irq;
1619 } else {
1620 ret = axienet_init_legacy_dma(ndev);
1621 if (ret)
1622 goto err_phy;
1623 }
1624
1625 return 0;
1626
1627err_free_eth_irq:
1628 if (lp->eth_irq > 0)
1629 free_irq(lp->eth_irq, ndev);
1630err_phy:
1631 cancel_delayed_work_sync(&lp->stats_work);
1632 phylink_stop(lp->phylink);
1633 phylink_disconnect_phy(lp->phylink);
1634 return ret;
1635}
1636
1637/**
1638 * axienet_stop - Driver stop routine.
1639 * @ndev: Pointer to net_device structure
1640 *
1641 * Return: 0, on success.
1642 *
1643 * This is the driver stop routine. It calls phylink_disconnect to stop the PHY
1644 * device. It also removes the interrupt handlers and disables the interrupts.
1645 * The Axi DMA Tx/Rx BDs are released.
1646 */
1647static int axienet_stop(struct net_device *ndev)
1648{
1649 struct axienet_local *lp = netdev_priv(ndev);
1650 int i;
1651
1652 if (!lp->use_dmaengine) {
1653 WRITE_ONCE(lp->stopping, true);
1654 flush_work(&lp->dma_err_task);
1655
1656 napi_disable(&lp->napi_tx);
1657 napi_disable(&lp->napi_rx);
1658 }
1659
1660 cancel_delayed_work_sync(&lp->stats_work);
1661
1662 phylink_stop(lp->phylink);
1663 phylink_disconnect_phy(lp->phylink);
1664
1665 axienet_setoptions(ndev, lp->options &
1666 ~(XAE_OPTION_TXEN | XAE_OPTION_RXEN));
1667
1668 if (!lp->use_dmaengine) {
1669 axienet_dma_stop(lp);
1670 cancel_work_sync(&lp->dma_err_task);
1671 free_irq(lp->tx_irq, ndev);
1672 free_irq(lp->rx_irq, ndev);
1673 axienet_dma_bd_release(ndev);
1674 } else {
1675 dmaengine_terminate_sync(lp->tx_chan);
1676 dmaengine_synchronize(lp->tx_chan);
1677 dmaengine_terminate_sync(lp->rx_chan);
1678 dmaengine_synchronize(lp->rx_chan);
1679
1680 for (i = 0; i < TX_BD_NUM_MAX; i++)
1681 kfree(lp->tx_skb_ring[i]);
1682 kfree(lp->tx_skb_ring);
1683 for (i = 0; i < RX_BUF_NUM_DEFAULT; i++)
1684 kfree(lp->rx_skb_ring[i]);
1685 kfree(lp->rx_skb_ring);
1686
1687 dma_release_channel(lp->rx_chan);
1688 dma_release_channel(lp->tx_chan);
1689 }
1690
1691 axienet_iow(lp, XAE_IE_OFFSET, 0);
1692
1693 if (lp->eth_irq > 0)
1694 free_irq(lp->eth_irq, ndev);
1695 return 0;
1696}
1697
1698/**
1699 * axienet_change_mtu - Driver change mtu routine.
1700 * @ndev: Pointer to net_device structure
1701 * @new_mtu: New mtu value to be applied
1702 *
1703 * Return: Always returns 0 (success).
1704 *
1705 * This is the change mtu driver routine. It checks if the Axi Ethernet
1706 * hardware supports jumbo frames before changing the mtu. This can be
1707 * called only when the device is not up.
1708 */
1709static int axienet_change_mtu(struct net_device *ndev, int new_mtu)
1710{
1711 struct axienet_local *lp = netdev_priv(ndev);
1712
1713 if (netif_running(ndev))
1714 return -EBUSY;
1715
1716 if ((new_mtu + VLAN_ETH_HLEN +
1717 XAE_TRL_SIZE) > lp->rxmem)
1718 return -EINVAL;
1719
1720 WRITE_ONCE(ndev->mtu, new_mtu);
1721
1722 return 0;
1723}
1724
1725#ifdef CONFIG_NET_POLL_CONTROLLER
1726/**
1727 * axienet_poll_controller - Axi Ethernet poll mechanism.
1728 * @ndev: Pointer to net_device structure
1729 *
1730 * This implements Rx/Tx ISR poll mechanisms. The interrupts are disabled prior
1731 * to polling the ISRs and are enabled back after the polling is done.
1732 */
1733static void axienet_poll_controller(struct net_device *ndev)
1734{
1735 struct axienet_local *lp = netdev_priv(ndev);
1736
1737 disable_irq(lp->tx_irq);
1738 disable_irq(lp->rx_irq);
1739 axienet_rx_irq(lp->tx_irq, ndev);
1740 axienet_tx_irq(lp->rx_irq, ndev);
1741 enable_irq(lp->tx_irq);
1742 enable_irq(lp->rx_irq);
1743}
1744#endif
1745
1746static int axienet_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
1747{
1748 struct axienet_local *lp = netdev_priv(dev);
1749
1750 if (!netif_running(dev))
1751 return -EINVAL;
1752
1753 return phylink_mii_ioctl(lp->phylink, rq, cmd);
1754}
1755
1756static void
1757axienet_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
1758{
1759 struct axienet_local *lp = netdev_priv(dev);
1760 unsigned int start;
1761
1762 netdev_stats_to_stats64(stats, &dev->stats);
1763
1764 do {
1765 start = u64_stats_fetch_begin(&lp->rx_stat_sync);
1766 stats->rx_packets = u64_stats_read(&lp->rx_packets);
1767 stats->rx_bytes = u64_stats_read(&lp->rx_bytes);
1768 } while (u64_stats_fetch_retry(&lp->rx_stat_sync, start));
1769
1770 do {
1771 start = u64_stats_fetch_begin(&lp->tx_stat_sync);
1772 stats->tx_packets = u64_stats_read(&lp->tx_packets);
1773 stats->tx_bytes = u64_stats_read(&lp->tx_bytes);
1774 } while (u64_stats_fetch_retry(&lp->tx_stat_sync, start));
1775
1776 if (!(lp->features & XAE_FEATURE_STATS))
1777 return;
1778
1779 do {
1780 start = read_seqcount_begin(&lp->hw_stats_seqcount);
1781 stats->rx_length_errors =
1782 axienet_stat(lp, STAT_RX_LENGTH_ERRORS);
1783 stats->rx_crc_errors = axienet_stat(lp, STAT_RX_FCS_ERRORS);
1784 stats->rx_frame_errors =
1785 axienet_stat(lp, STAT_RX_ALIGNMENT_ERRORS);
1786 stats->rx_errors = axienet_stat(lp, STAT_UNDERSIZE_FRAMES) +
1787 axienet_stat(lp, STAT_FRAGMENT_FRAMES) +
1788 stats->rx_length_errors +
1789 stats->rx_crc_errors +
1790 stats->rx_frame_errors;
1791 stats->multicast = axienet_stat(lp, STAT_RX_MULTICAST_FRAMES);
1792
1793 stats->tx_aborted_errors =
1794 axienet_stat(lp, STAT_TX_EXCESS_COLLISIONS);
1795 stats->tx_fifo_errors =
1796 axienet_stat(lp, STAT_TX_UNDERRUN_ERRORS);
1797 stats->tx_window_errors =
1798 axienet_stat(lp, STAT_TX_LATE_COLLISIONS);
1799 stats->tx_errors = axienet_stat(lp, STAT_TX_EXCESS_DEFERRAL) +
1800 stats->tx_aborted_errors +
1801 stats->tx_fifo_errors +
1802 stats->tx_window_errors;
1803 } while (read_seqcount_retry(&lp->hw_stats_seqcount, start));
1804}
1805
1806static const struct net_device_ops axienet_netdev_ops = {
1807 .ndo_open = axienet_open,
1808 .ndo_stop = axienet_stop,
1809 .ndo_start_xmit = axienet_start_xmit,
1810 .ndo_get_stats64 = axienet_get_stats64,
1811 .ndo_change_mtu = axienet_change_mtu,
1812 .ndo_set_mac_address = netdev_set_mac_address,
1813 .ndo_validate_addr = eth_validate_addr,
1814 .ndo_eth_ioctl = axienet_ioctl,
1815 .ndo_set_rx_mode = axienet_set_multicast_list,
1816#ifdef CONFIG_NET_POLL_CONTROLLER
1817 .ndo_poll_controller = axienet_poll_controller,
1818#endif
1819};
1820
1821static const struct net_device_ops axienet_netdev_dmaengine_ops = {
1822 .ndo_open = axienet_open,
1823 .ndo_stop = axienet_stop,
1824 .ndo_start_xmit = axienet_start_xmit_dmaengine,
1825 .ndo_get_stats64 = axienet_get_stats64,
1826 .ndo_change_mtu = axienet_change_mtu,
1827 .ndo_set_mac_address = netdev_set_mac_address,
1828 .ndo_validate_addr = eth_validate_addr,
1829 .ndo_eth_ioctl = axienet_ioctl,
1830 .ndo_set_rx_mode = axienet_set_multicast_list,
1831};
1832
1833/**
1834 * axienet_ethtools_get_drvinfo - Get various Axi Ethernet driver information.
1835 * @ndev: Pointer to net_device structure
1836 * @ed: Pointer to ethtool_drvinfo structure
1837 *
1838 * This implements ethtool command for getting the driver information.
1839 * Issue "ethtool -i ethX" under linux prompt to execute this function.
1840 */
1841static void axienet_ethtools_get_drvinfo(struct net_device *ndev,
1842 struct ethtool_drvinfo *ed)
1843{
1844 strscpy(ed->driver, DRIVER_NAME, sizeof(ed->driver));
1845 strscpy(ed->version, DRIVER_VERSION, sizeof(ed->version));
1846}
1847
1848/**
1849 * axienet_ethtools_get_regs_len - Get the total regs length present in the
1850 * AxiEthernet core.
1851 * @ndev: Pointer to net_device structure
1852 *
1853 * This implements ethtool command for getting the total register length
1854 * information.
1855 *
1856 * Return: the total regs length
1857 */
1858static int axienet_ethtools_get_regs_len(struct net_device *ndev)
1859{
1860 return sizeof(u32) * AXIENET_REGS_N;
1861}
1862
1863/**
1864 * axienet_ethtools_get_regs - Dump the contents of all registers present
1865 * in AxiEthernet core.
1866 * @ndev: Pointer to net_device structure
1867 * @regs: Pointer to ethtool_regs structure
1868 * @ret: Void pointer used to return the contents of the registers.
1869 *
1870 * This implements ethtool command for getting the Axi Ethernet register dump.
1871 * Issue "ethtool -d ethX" to execute this function.
1872 */
1873static void axienet_ethtools_get_regs(struct net_device *ndev,
1874 struct ethtool_regs *regs, void *ret)
1875{
1876 u32 *data = (u32 *)ret;
1877 size_t len = sizeof(u32) * AXIENET_REGS_N;
1878 struct axienet_local *lp = netdev_priv(ndev);
1879
1880 regs->version = 0;
1881 regs->len = len;
1882
1883 memset(data, 0, len);
1884 data[0] = axienet_ior(lp, XAE_RAF_OFFSET);
1885 data[1] = axienet_ior(lp, XAE_TPF_OFFSET);
1886 data[2] = axienet_ior(lp, XAE_IFGP_OFFSET);
1887 data[3] = axienet_ior(lp, XAE_IS_OFFSET);
1888 data[4] = axienet_ior(lp, XAE_IP_OFFSET);
1889 data[5] = axienet_ior(lp, XAE_IE_OFFSET);
1890 data[6] = axienet_ior(lp, XAE_TTAG_OFFSET);
1891 data[7] = axienet_ior(lp, XAE_RTAG_OFFSET);
1892 data[8] = axienet_ior(lp, XAE_UAWL_OFFSET);
1893 data[9] = axienet_ior(lp, XAE_UAWU_OFFSET);
1894 data[10] = axienet_ior(lp, XAE_TPID0_OFFSET);
1895 data[11] = axienet_ior(lp, XAE_TPID1_OFFSET);
1896 data[12] = axienet_ior(lp, XAE_PPST_OFFSET);
1897 data[13] = axienet_ior(lp, XAE_RCW0_OFFSET);
1898 data[14] = axienet_ior(lp, XAE_RCW1_OFFSET);
1899 data[15] = axienet_ior(lp, XAE_TC_OFFSET);
1900 data[16] = axienet_ior(lp, XAE_FCC_OFFSET);
1901 data[17] = axienet_ior(lp, XAE_EMMC_OFFSET);
1902 data[18] = axienet_ior(lp, XAE_PHYC_OFFSET);
1903 data[19] = axienet_ior(lp, XAE_MDIO_MC_OFFSET);
1904 data[20] = axienet_ior(lp, XAE_MDIO_MCR_OFFSET);
1905 data[21] = axienet_ior(lp, XAE_MDIO_MWD_OFFSET);
1906 data[22] = axienet_ior(lp, XAE_MDIO_MRD_OFFSET);
1907 data[27] = axienet_ior(lp, XAE_UAW0_OFFSET);
1908 data[28] = axienet_ior(lp, XAE_UAW1_OFFSET);
1909 data[29] = axienet_ior(lp, XAE_FMI_OFFSET);
1910 data[30] = axienet_ior(lp, XAE_AF0_OFFSET);
1911 data[31] = axienet_ior(lp, XAE_AF1_OFFSET);
1912 if (!lp->use_dmaengine) {
1913 data[32] = axienet_dma_in32(lp, XAXIDMA_TX_CR_OFFSET);
1914 data[33] = axienet_dma_in32(lp, XAXIDMA_TX_SR_OFFSET);
1915 data[34] = axienet_dma_in32(lp, XAXIDMA_TX_CDESC_OFFSET);
1916 data[35] = axienet_dma_in32(lp, XAXIDMA_TX_TDESC_OFFSET);
1917 data[36] = axienet_dma_in32(lp, XAXIDMA_RX_CR_OFFSET);
1918 data[37] = axienet_dma_in32(lp, XAXIDMA_RX_SR_OFFSET);
1919 data[38] = axienet_dma_in32(lp, XAXIDMA_RX_CDESC_OFFSET);
1920 data[39] = axienet_dma_in32(lp, XAXIDMA_RX_TDESC_OFFSET);
1921 }
1922}
1923
1924static void
1925axienet_ethtools_get_ringparam(struct net_device *ndev,
1926 struct ethtool_ringparam *ering,
1927 struct kernel_ethtool_ringparam *kernel_ering,
1928 struct netlink_ext_ack *extack)
1929{
1930 struct axienet_local *lp = netdev_priv(ndev);
1931
1932 ering->rx_max_pending = RX_BD_NUM_MAX;
1933 ering->rx_mini_max_pending = 0;
1934 ering->rx_jumbo_max_pending = 0;
1935 ering->tx_max_pending = TX_BD_NUM_MAX;
1936 ering->rx_pending = lp->rx_bd_num;
1937 ering->rx_mini_pending = 0;
1938 ering->rx_jumbo_pending = 0;
1939 ering->tx_pending = lp->tx_bd_num;
1940}
1941
1942static int
1943axienet_ethtools_set_ringparam(struct net_device *ndev,
1944 struct ethtool_ringparam *ering,
1945 struct kernel_ethtool_ringparam *kernel_ering,
1946 struct netlink_ext_ack *extack)
1947{
1948 struct axienet_local *lp = netdev_priv(ndev);
1949
1950 if (ering->rx_pending > RX_BD_NUM_MAX ||
1951 ering->rx_mini_pending ||
1952 ering->rx_jumbo_pending ||
1953 ering->tx_pending < TX_BD_NUM_MIN ||
1954 ering->tx_pending > TX_BD_NUM_MAX)
1955 return -EINVAL;
1956
1957 if (netif_running(ndev))
1958 return -EBUSY;
1959
1960 lp->rx_bd_num = ering->rx_pending;
1961 lp->tx_bd_num = ering->tx_pending;
1962 return 0;
1963}
1964
1965/**
1966 * axienet_ethtools_get_pauseparam - Get the pause parameter setting for
1967 * Tx and Rx paths.
1968 * @ndev: Pointer to net_device structure
1969 * @epauseparm: Pointer to ethtool_pauseparam structure.
1970 *
1971 * This implements ethtool command for getting axi ethernet pause frame
1972 * setting. Issue "ethtool -a ethX" to execute this function.
1973 */
1974static void
1975axienet_ethtools_get_pauseparam(struct net_device *ndev,
1976 struct ethtool_pauseparam *epauseparm)
1977{
1978 struct axienet_local *lp = netdev_priv(ndev);
1979
1980 phylink_ethtool_get_pauseparam(lp->phylink, epauseparm);
1981}
1982
1983/**
1984 * axienet_ethtools_set_pauseparam - Set device pause parameter(flow control)
1985 * settings.
1986 * @ndev: Pointer to net_device structure
1987 * @epauseparm:Pointer to ethtool_pauseparam structure
1988 *
1989 * This implements ethtool command for enabling flow control on Rx and Tx
1990 * paths. Issue "ethtool -A ethX tx on|off" under linux prompt to execute this
1991 * function.
1992 *
1993 * Return: 0 on success, -EFAULT if device is running
1994 */
1995static int
1996axienet_ethtools_set_pauseparam(struct net_device *ndev,
1997 struct ethtool_pauseparam *epauseparm)
1998{
1999 struct axienet_local *lp = netdev_priv(ndev);
2000
2001 return phylink_ethtool_set_pauseparam(lp->phylink, epauseparm);
2002}
2003
2004/**
2005 * axienet_ethtools_get_coalesce - Get DMA interrupt coalescing count.
2006 * @ndev: Pointer to net_device structure
2007 * @ecoalesce: Pointer to ethtool_coalesce structure
2008 * @kernel_coal: ethtool CQE mode setting structure
2009 * @extack: extack for reporting error messages
2010 *
2011 * This implements ethtool command for getting the DMA interrupt coalescing
2012 * count on Tx and Rx paths. Issue "ethtool -c ethX" under linux prompt to
2013 * execute this function.
2014 *
2015 * Return: 0 always
2016 */
2017static int
2018axienet_ethtools_get_coalesce(struct net_device *ndev,
2019 struct ethtool_coalesce *ecoalesce,
2020 struct kernel_ethtool_coalesce *kernel_coal,
2021 struct netlink_ext_ack *extack)
2022{
2023 struct axienet_local *lp = netdev_priv(ndev);
2024
2025 ecoalesce->rx_max_coalesced_frames = lp->coalesce_count_rx;
2026 ecoalesce->rx_coalesce_usecs = lp->coalesce_usec_rx;
2027 ecoalesce->tx_max_coalesced_frames = lp->coalesce_count_tx;
2028 ecoalesce->tx_coalesce_usecs = lp->coalesce_usec_tx;
2029 return 0;
2030}
2031
2032/**
2033 * axienet_ethtools_set_coalesce - Set DMA interrupt coalescing count.
2034 * @ndev: Pointer to net_device structure
2035 * @ecoalesce: Pointer to ethtool_coalesce structure
2036 * @kernel_coal: ethtool CQE mode setting structure
2037 * @extack: extack for reporting error messages
2038 *
2039 * This implements ethtool command for setting the DMA interrupt coalescing
2040 * count on Tx and Rx paths. Issue "ethtool -C ethX rx-frames 5" under linux
2041 * prompt to execute this function.
2042 *
2043 * Return: 0, on success, Non-zero error value on failure.
2044 */
2045static int
2046axienet_ethtools_set_coalesce(struct net_device *ndev,
2047 struct ethtool_coalesce *ecoalesce,
2048 struct kernel_ethtool_coalesce *kernel_coal,
2049 struct netlink_ext_ack *extack)
2050{
2051 struct axienet_local *lp = netdev_priv(ndev);
2052
2053 if (netif_running(ndev)) {
2054 NL_SET_ERR_MSG(extack,
2055 "Please stop netif before applying configuration");
2056 return -EBUSY;
2057 }
2058
2059 if (ecoalesce->rx_max_coalesced_frames > 255 ||
2060 ecoalesce->tx_max_coalesced_frames > 255) {
2061 NL_SET_ERR_MSG(extack, "frames must be less than 256");
2062 return -EINVAL;
2063 }
2064
2065 if (ecoalesce->rx_max_coalesced_frames)
2066 lp->coalesce_count_rx = ecoalesce->rx_max_coalesced_frames;
2067 if (ecoalesce->rx_coalesce_usecs)
2068 lp->coalesce_usec_rx = ecoalesce->rx_coalesce_usecs;
2069 if (ecoalesce->tx_max_coalesced_frames)
2070 lp->coalesce_count_tx = ecoalesce->tx_max_coalesced_frames;
2071 if (ecoalesce->tx_coalesce_usecs)
2072 lp->coalesce_usec_tx = ecoalesce->tx_coalesce_usecs;
2073
2074 return 0;
2075}
2076
2077static int
2078axienet_ethtools_get_link_ksettings(struct net_device *ndev,
2079 struct ethtool_link_ksettings *cmd)
2080{
2081 struct axienet_local *lp = netdev_priv(ndev);
2082
2083 return phylink_ethtool_ksettings_get(lp->phylink, cmd);
2084}
2085
2086static int
2087axienet_ethtools_set_link_ksettings(struct net_device *ndev,
2088 const struct ethtool_link_ksettings *cmd)
2089{
2090 struct axienet_local *lp = netdev_priv(ndev);
2091
2092 return phylink_ethtool_ksettings_set(lp->phylink, cmd);
2093}
2094
2095static int axienet_ethtools_nway_reset(struct net_device *dev)
2096{
2097 struct axienet_local *lp = netdev_priv(dev);
2098
2099 return phylink_ethtool_nway_reset(lp->phylink);
2100}
2101
2102static void axienet_ethtools_get_ethtool_stats(struct net_device *dev,
2103 struct ethtool_stats *stats,
2104 u64 *data)
2105{
2106 struct axienet_local *lp = netdev_priv(dev);
2107 unsigned int start;
2108
2109 do {
2110 start = read_seqcount_begin(&lp->hw_stats_seqcount);
2111 data[0] = axienet_stat(lp, STAT_RX_BYTES);
2112 data[1] = axienet_stat(lp, STAT_TX_BYTES);
2113 data[2] = axienet_stat(lp, STAT_RX_VLAN_FRAMES);
2114 data[3] = axienet_stat(lp, STAT_TX_VLAN_FRAMES);
2115 data[6] = axienet_stat(lp, STAT_TX_PFC_FRAMES);
2116 data[7] = axienet_stat(lp, STAT_RX_PFC_FRAMES);
2117 data[8] = axienet_stat(lp, STAT_USER_DEFINED0);
2118 data[9] = axienet_stat(lp, STAT_USER_DEFINED1);
2119 data[10] = axienet_stat(lp, STAT_USER_DEFINED2);
2120 } while (read_seqcount_retry(&lp->hw_stats_seqcount, start));
2121}
2122
2123static const char axienet_ethtool_stats_strings[][ETH_GSTRING_LEN] = {
2124 "Received bytes",
2125 "Transmitted bytes",
2126 "RX Good VLAN Tagged Frames",
2127 "TX Good VLAN Tagged Frames",
2128 "TX Good PFC Frames",
2129 "RX Good PFC Frames",
2130 "User Defined Counter 0",
2131 "User Defined Counter 1",
2132 "User Defined Counter 2",
2133};
2134
2135static void axienet_ethtools_get_strings(struct net_device *dev, u32 stringset, u8 *data)
2136{
2137 switch (stringset) {
2138 case ETH_SS_STATS:
2139 memcpy(data, axienet_ethtool_stats_strings,
2140 sizeof(axienet_ethtool_stats_strings));
2141 break;
2142 }
2143}
2144
2145static int axienet_ethtools_get_sset_count(struct net_device *dev, int sset)
2146{
2147 struct axienet_local *lp = netdev_priv(dev);
2148
2149 switch (sset) {
2150 case ETH_SS_STATS:
2151 if (lp->features & XAE_FEATURE_STATS)
2152 return ARRAY_SIZE(axienet_ethtool_stats_strings);
2153 fallthrough;
2154 default:
2155 return -EOPNOTSUPP;
2156 }
2157}
2158
2159static void
2160axienet_ethtools_get_pause_stats(struct net_device *dev,
2161 struct ethtool_pause_stats *pause_stats)
2162{
2163 struct axienet_local *lp = netdev_priv(dev);
2164 unsigned int start;
2165
2166 if (!(lp->features & XAE_FEATURE_STATS))
2167 return;
2168
2169 do {
2170 start = read_seqcount_begin(&lp->hw_stats_seqcount);
2171 pause_stats->tx_pause_frames =
2172 axienet_stat(lp, STAT_TX_PAUSE_FRAMES);
2173 pause_stats->rx_pause_frames =
2174 axienet_stat(lp, STAT_RX_PAUSE_FRAMES);
2175 } while (read_seqcount_retry(&lp->hw_stats_seqcount, start));
2176}
2177
2178static void
2179axienet_ethtool_get_eth_mac_stats(struct net_device *dev,
2180 struct ethtool_eth_mac_stats *mac_stats)
2181{
2182 struct axienet_local *lp = netdev_priv(dev);
2183 unsigned int start;
2184
2185 if (!(lp->features & XAE_FEATURE_STATS))
2186 return;
2187
2188 do {
2189 start = read_seqcount_begin(&lp->hw_stats_seqcount);
2190 mac_stats->FramesTransmittedOK =
2191 axienet_stat(lp, STAT_TX_GOOD_FRAMES);
2192 mac_stats->SingleCollisionFrames =
2193 axienet_stat(lp, STAT_TX_SINGLE_COLLISION_FRAMES);
2194 mac_stats->MultipleCollisionFrames =
2195 axienet_stat(lp, STAT_TX_MULTIPLE_COLLISION_FRAMES);
2196 mac_stats->FramesReceivedOK =
2197 axienet_stat(lp, STAT_RX_GOOD_FRAMES);
2198 mac_stats->FrameCheckSequenceErrors =
2199 axienet_stat(lp, STAT_RX_FCS_ERRORS);
2200 mac_stats->AlignmentErrors =
2201 axienet_stat(lp, STAT_RX_ALIGNMENT_ERRORS);
2202 mac_stats->FramesWithDeferredXmissions =
2203 axienet_stat(lp, STAT_TX_DEFERRED_FRAMES);
2204 mac_stats->LateCollisions =
2205 axienet_stat(lp, STAT_TX_LATE_COLLISIONS);
2206 mac_stats->FramesAbortedDueToXSColls =
2207 axienet_stat(lp, STAT_TX_EXCESS_COLLISIONS);
2208 mac_stats->MulticastFramesXmittedOK =
2209 axienet_stat(lp, STAT_TX_MULTICAST_FRAMES);
2210 mac_stats->BroadcastFramesXmittedOK =
2211 axienet_stat(lp, STAT_TX_BROADCAST_FRAMES);
2212 mac_stats->FramesWithExcessiveDeferral =
2213 axienet_stat(lp, STAT_TX_EXCESS_DEFERRAL);
2214 mac_stats->MulticastFramesReceivedOK =
2215 axienet_stat(lp, STAT_RX_MULTICAST_FRAMES);
2216 mac_stats->BroadcastFramesReceivedOK =
2217 axienet_stat(lp, STAT_RX_BROADCAST_FRAMES);
2218 mac_stats->InRangeLengthErrors =
2219 axienet_stat(lp, STAT_RX_LENGTH_ERRORS);
2220 } while (read_seqcount_retry(&lp->hw_stats_seqcount, start));
2221}
2222
2223static void
2224axienet_ethtool_get_eth_ctrl_stats(struct net_device *dev,
2225 struct ethtool_eth_ctrl_stats *ctrl_stats)
2226{
2227 struct axienet_local *lp = netdev_priv(dev);
2228 unsigned int start;
2229
2230 if (!(lp->features & XAE_FEATURE_STATS))
2231 return;
2232
2233 do {
2234 start = read_seqcount_begin(&lp->hw_stats_seqcount);
2235 ctrl_stats->MACControlFramesTransmitted =
2236 axienet_stat(lp, STAT_TX_CONTROL_FRAMES);
2237 ctrl_stats->MACControlFramesReceived =
2238 axienet_stat(lp, STAT_RX_CONTROL_FRAMES);
2239 ctrl_stats->UnsupportedOpcodesReceived =
2240 axienet_stat(lp, STAT_RX_CONTROL_OPCODE_ERRORS);
2241 } while (read_seqcount_retry(&lp->hw_stats_seqcount, start));
2242}
2243
2244static const struct ethtool_rmon_hist_range axienet_rmon_ranges[] = {
2245 { 64, 64 },
2246 { 65, 127 },
2247 { 128, 255 },
2248 { 256, 511 },
2249 { 512, 1023 },
2250 { 1024, 1518 },
2251 { 1519, 16384 },
2252 { },
2253};
2254
2255static void
2256axienet_ethtool_get_rmon_stats(struct net_device *dev,
2257 struct ethtool_rmon_stats *rmon_stats,
2258 const struct ethtool_rmon_hist_range **ranges)
2259{
2260 struct axienet_local *lp = netdev_priv(dev);
2261 unsigned int start;
2262
2263 if (!(lp->features & XAE_FEATURE_STATS))
2264 return;
2265
2266 do {
2267 start = read_seqcount_begin(&lp->hw_stats_seqcount);
2268 rmon_stats->undersize_pkts =
2269 axienet_stat(lp, STAT_UNDERSIZE_FRAMES);
2270 rmon_stats->oversize_pkts =
2271 axienet_stat(lp, STAT_RX_OVERSIZE_FRAMES);
2272 rmon_stats->fragments =
2273 axienet_stat(lp, STAT_FRAGMENT_FRAMES);
2274
2275 rmon_stats->hist[0] =
2276 axienet_stat(lp, STAT_RX_64_BYTE_FRAMES);
2277 rmon_stats->hist[1] =
2278 axienet_stat(lp, STAT_RX_65_127_BYTE_FRAMES);
2279 rmon_stats->hist[2] =
2280 axienet_stat(lp, STAT_RX_128_255_BYTE_FRAMES);
2281 rmon_stats->hist[3] =
2282 axienet_stat(lp, STAT_RX_256_511_BYTE_FRAMES);
2283 rmon_stats->hist[4] =
2284 axienet_stat(lp, STAT_RX_512_1023_BYTE_FRAMES);
2285 rmon_stats->hist[5] =
2286 axienet_stat(lp, STAT_RX_1024_MAX_BYTE_FRAMES);
2287 rmon_stats->hist[6] =
2288 rmon_stats->oversize_pkts;
2289
2290 rmon_stats->hist_tx[0] =
2291 axienet_stat(lp, STAT_TX_64_BYTE_FRAMES);
2292 rmon_stats->hist_tx[1] =
2293 axienet_stat(lp, STAT_TX_65_127_BYTE_FRAMES);
2294 rmon_stats->hist_tx[2] =
2295 axienet_stat(lp, STAT_TX_128_255_BYTE_FRAMES);
2296 rmon_stats->hist_tx[3] =
2297 axienet_stat(lp, STAT_TX_256_511_BYTE_FRAMES);
2298 rmon_stats->hist_tx[4] =
2299 axienet_stat(lp, STAT_TX_512_1023_BYTE_FRAMES);
2300 rmon_stats->hist_tx[5] =
2301 axienet_stat(lp, STAT_TX_1024_MAX_BYTE_FRAMES);
2302 rmon_stats->hist_tx[6] =
2303 axienet_stat(lp, STAT_TX_OVERSIZE_FRAMES);
2304 } while (read_seqcount_retry(&lp->hw_stats_seqcount, start));
2305
2306 *ranges = axienet_rmon_ranges;
2307}
2308
2309static const struct ethtool_ops axienet_ethtool_ops = {
2310 .supported_coalesce_params = ETHTOOL_COALESCE_MAX_FRAMES |
2311 ETHTOOL_COALESCE_USECS,
2312 .get_drvinfo = axienet_ethtools_get_drvinfo,
2313 .get_regs_len = axienet_ethtools_get_regs_len,
2314 .get_regs = axienet_ethtools_get_regs,
2315 .get_link = ethtool_op_get_link,
2316 .get_ringparam = axienet_ethtools_get_ringparam,
2317 .set_ringparam = axienet_ethtools_set_ringparam,
2318 .get_pauseparam = axienet_ethtools_get_pauseparam,
2319 .set_pauseparam = axienet_ethtools_set_pauseparam,
2320 .get_coalesce = axienet_ethtools_get_coalesce,
2321 .set_coalesce = axienet_ethtools_set_coalesce,
2322 .get_link_ksettings = axienet_ethtools_get_link_ksettings,
2323 .set_link_ksettings = axienet_ethtools_set_link_ksettings,
2324 .nway_reset = axienet_ethtools_nway_reset,
2325 .get_ethtool_stats = axienet_ethtools_get_ethtool_stats,
2326 .get_strings = axienet_ethtools_get_strings,
2327 .get_sset_count = axienet_ethtools_get_sset_count,
2328 .get_pause_stats = axienet_ethtools_get_pause_stats,
2329 .get_eth_mac_stats = axienet_ethtool_get_eth_mac_stats,
2330 .get_eth_ctrl_stats = axienet_ethtool_get_eth_ctrl_stats,
2331 .get_rmon_stats = axienet_ethtool_get_rmon_stats,
2332};
2333
2334static struct axienet_local *pcs_to_axienet_local(struct phylink_pcs *pcs)
2335{
2336 return container_of(pcs, struct axienet_local, pcs);
2337}
2338
2339static void axienet_pcs_get_state(struct phylink_pcs *pcs,
2340 struct phylink_link_state *state)
2341{
2342 struct mdio_device *pcs_phy = pcs_to_axienet_local(pcs)->pcs_phy;
2343
2344 phylink_mii_c22_pcs_get_state(pcs_phy, state);
2345}
2346
2347static void axienet_pcs_an_restart(struct phylink_pcs *pcs)
2348{
2349 struct mdio_device *pcs_phy = pcs_to_axienet_local(pcs)->pcs_phy;
2350
2351 phylink_mii_c22_pcs_an_restart(pcs_phy);
2352}
2353
2354static int axienet_pcs_config(struct phylink_pcs *pcs, unsigned int neg_mode,
2355 phy_interface_t interface,
2356 const unsigned long *advertising,
2357 bool permit_pause_to_mac)
2358{
2359 struct mdio_device *pcs_phy = pcs_to_axienet_local(pcs)->pcs_phy;
2360 struct net_device *ndev = pcs_to_axienet_local(pcs)->ndev;
2361 struct axienet_local *lp = netdev_priv(ndev);
2362 int ret;
2363
2364 if (lp->switch_x_sgmii) {
2365 ret = mdiodev_write(pcs_phy, XLNX_MII_STD_SELECT_REG,
2366 interface == PHY_INTERFACE_MODE_SGMII ?
2367 XLNX_MII_STD_SELECT_SGMII : 0);
2368 if (ret < 0) {
2369 netdev_warn(ndev,
2370 "Failed to switch PHY interface: %d\n",
2371 ret);
2372 return ret;
2373 }
2374 }
2375
2376 ret = phylink_mii_c22_pcs_config(pcs_phy, interface, advertising,
2377 neg_mode);
2378 if (ret < 0)
2379 netdev_warn(ndev, "Failed to configure PCS: %d\n", ret);
2380
2381 return ret;
2382}
2383
2384static const struct phylink_pcs_ops axienet_pcs_ops = {
2385 .pcs_get_state = axienet_pcs_get_state,
2386 .pcs_config = axienet_pcs_config,
2387 .pcs_an_restart = axienet_pcs_an_restart,
2388};
2389
2390static struct phylink_pcs *axienet_mac_select_pcs(struct phylink_config *config,
2391 phy_interface_t interface)
2392{
2393 struct net_device *ndev = to_net_dev(config->dev);
2394 struct axienet_local *lp = netdev_priv(ndev);
2395
2396 if (interface == PHY_INTERFACE_MODE_1000BASEX ||
2397 interface == PHY_INTERFACE_MODE_SGMII)
2398 return &lp->pcs;
2399
2400 return NULL;
2401}
2402
2403static void axienet_mac_config(struct phylink_config *config, unsigned int mode,
2404 const struct phylink_link_state *state)
2405{
2406 /* nothing meaningful to do */
2407}
2408
2409static void axienet_mac_link_down(struct phylink_config *config,
2410 unsigned int mode,
2411 phy_interface_t interface)
2412{
2413 /* nothing meaningful to do */
2414}
2415
2416static void axienet_mac_link_up(struct phylink_config *config,
2417 struct phy_device *phy,
2418 unsigned int mode, phy_interface_t interface,
2419 int speed, int duplex,
2420 bool tx_pause, bool rx_pause)
2421{
2422 struct net_device *ndev = to_net_dev(config->dev);
2423 struct axienet_local *lp = netdev_priv(ndev);
2424 u32 emmc_reg, fcc_reg;
2425
2426 emmc_reg = axienet_ior(lp, XAE_EMMC_OFFSET);
2427 emmc_reg &= ~XAE_EMMC_LINKSPEED_MASK;
2428
2429 switch (speed) {
2430 case SPEED_1000:
2431 emmc_reg |= XAE_EMMC_LINKSPD_1000;
2432 break;
2433 case SPEED_100:
2434 emmc_reg |= XAE_EMMC_LINKSPD_100;
2435 break;
2436 case SPEED_10:
2437 emmc_reg |= XAE_EMMC_LINKSPD_10;
2438 break;
2439 default:
2440 dev_err(&ndev->dev,
2441 "Speed other than 10, 100 or 1Gbps is not supported\n");
2442 break;
2443 }
2444
2445 axienet_iow(lp, XAE_EMMC_OFFSET, emmc_reg);
2446
2447 fcc_reg = axienet_ior(lp, XAE_FCC_OFFSET);
2448 if (tx_pause)
2449 fcc_reg |= XAE_FCC_FCTX_MASK;
2450 else
2451 fcc_reg &= ~XAE_FCC_FCTX_MASK;
2452 if (rx_pause)
2453 fcc_reg |= XAE_FCC_FCRX_MASK;
2454 else
2455 fcc_reg &= ~XAE_FCC_FCRX_MASK;
2456 axienet_iow(lp, XAE_FCC_OFFSET, fcc_reg);
2457}
2458
2459static const struct phylink_mac_ops axienet_phylink_ops = {
2460 .mac_select_pcs = axienet_mac_select_pcs,
2461 .mac_config = axienet_mac_config,
2462 .mac_link_down = axienet_mac_link_down,
2463 .mac_link_up = axienet_mac_link_up,
2464};
2465
2466/**
2467 * axienet_dma_err_handler - Work queue task for Axi DMA Error
2468 * @work: pointer to work_struct
2469 *
2470 * Resets the Axi DMA and Axi Ethernet devices, and reconfigures the
2471 * Tx/Rx BDs.
2472 */
2473static void axienet_dma_err_handler(struct work_struct *work)
2474{
2475 u32 i;
2476 u32 axienet_status;
2477 struct axidma_bd *cur_p;
2478 struct axienet_local *lp = container_of(work, struct axienet_local,
2479 dma_err_task);
2480 struct net_device *ndev = lp->ndev;
2481
2482 /* Don't bother if we are going to stop anyway */
2483 if (READ_ONCE(lp->stopping))
2484 return;
2485
2486 napi_disable(&lp->napi_tx);
2487 napi_disable(&lp->napi_rx);
2488
2489 axienet_setoptions(ndev, lp->options &
2490 ~(XAE_OPTION_TXEN | XAE_OPTION_RXEN));
2491
2492 axienet_dma_stop(lp);
2493
2494 for (i = 0; i < lp->tx_bd_num; i++) {
2495 cur_p = &lp->tx_bd_v[i];
2496 if (cur_p->cntrl) {
2497 dma_addr_t addr = desc_get_phys_addr(lp, cur_p);
2498
2499 dma_unmap_single(lp->dev, addr,
2500 (cur_p->cntrl &
2501 XAXIDMA_BD_CTRL_LENGTH_MASK),
2502 DMA_TO_DEVICE);
2503 }
2504 if (cur_p->skb)
2505 dev_kfree_skb_irq(cur_p->skb);
2506 cur_p->phys = 0;
2507 cur_p->phys_msb = 0;
2508 cur_p->cntrl = 0;
2509 cur_p->status = 0;
2510 cur_p->app0 = 0;
2511 cur_p->app1 = 0;
2512 cur_p->app2 = 0;
2513 cur_p->app3 = 0;
2514 cur_p->app4 = 0;
2515 cur_p->skb = NULL;
2516 }
2517
2518 for (i = 0; i < lp->rx_bd_num; i++) {
2519 cur_p = &lp->rx_bd_v[i];
2520 cur_p->status = 0;
2521 cur_p->app0 = 0;
2522 cur_p->app1 = 0;
2523 cur_p->app2 = 0;
2524 cur_p->app3 = 0;
2525 cur_p->app4 = 0;
2526 }
2527
2528 lp->tx_bd_ci = 0;
2529 lp->tx_bd_tail = 0;
2530 lp->rx_bd_ci = 0;
2531
2532 axienet_dma_start(lp);
2533
2534 axienet_status = axienet_ior(lp, XAE_RCW1_OFFSET);
2535 axienet_status &= ~XAE_RCW1_RX_MASK;
2536 axienet_iow(lp, XAE_RCW1_OFFSET, axienet_status);
2537
2538 axienet_status = axienet_ior(lp, XAE_IP_OFFSET);
2539 if (axienet_status & XAE_INT_RXRJECT_MASK)
2540 axienet_iow(lp, XAE_IS_OFFSET, XAE_INT_RXRJECT_MASK);
2541 axienet_iow(lp, XAE_IE_OFFSET, lp->eth_irq > 0 ?
2542 XAE_INT_RECV_ERROR_MASK : 0);
2543 axienet_iow(lp, XAE_FCC_OFFSET, XAE_FCC_FCRX_MASK);
2544
2545 /* Sync default options with HW but leave receiver and
2546 * transmitter disabled.
2547 */
2548 axienet_setoptions(ndev, lp->options &
2549 ~(XAE_OPTION_TXEN | XAE_OPTION_RXEN));
2550 axienet_set_mac_address(ndev, NULL);
2551 axienet_set_multicast_list(ndev);
2552 napi_enable(&lp->napi_rx);
2553 napi_enable(&lp->napi_tx);
2554 axienet_setoptions(ndev, lp->options);
2555}
2556
2557/**
2558 * axienet_probe - Axi Ethernet probe function.
2559 * @pdev: Pointer to platform device structure.
2560 *
2561 * Return: 0, on success
2562 * Non-zero error value on failure.
2563 *
2564 * This is the probe routine for Axi Ethernet driver. This is called before
2565 * any other driver routines are invoked. It allocates and sets up the Ethernet
2566 * device. Parses through device tree and populates fields of
2567 * axienet_local. It registers the Ethernet device.
2568 */
2569static int axienet_probe(struct platform_device *pdev)
2570{
2571 int ret;
2572 struct device_node *np;
2573 struct axienet_local *lp;
2574 struct net_device *ndev;
2575 struct resource *ethres;
2576 u8 mac_addr[ETH_ALEN];
2577 int addr_width = 32;
2578 u32 value;
2579
2580 ndev = alloc_etherdev(sizeof(*lp));
2581 if (!ndev)
2582 return -ENOMEM;
2583
2584 platform_set_drvdata(pdev, ndev);
2585
2586 SET_NETDEV_DEV(ndev, &pdev->dev);
2587 ndev->features = NETIF_F_SG;
2588 ndev->ethtool_ops = &axienet_ethtool_ops;
2589
2590 /* MTU range: 64 - 9000 */
2591 ndev->min_mtu = 64;
2592 ndev->max_mtu = XAE_JUMBO_MTU;
2593
2594 lp = netdev_priv(ndev);
2595 lp->ndev = ndev;
2596 lp->dev = &pdev->dev;
2597 lp->options = XAE_OPTION_DEFAULTS;
2598 lp->rx_bd_num = RX_BD_NUM_DEFAULT;
2599 lp->tx_bd_num = TX_BD_NUM_DEFAULT;
2600
2601 u64_stats_init(&lp->rx_stat_sync);
2602 u64_stats_init(&lp->tx_stat_sync);
2603
2604 mutex_init(&lp->stats_lock);
2605 seqcount_mutex_init(&lp->hw_stats_seqcount, &lp->stats_lock);
2606 INIT_DEFERRABLE_WORK(&lp->stats_work, axienet_refresh_stats);
2607
2608 lp->axi_clk = devm_clk_get_optional(&pdev->dev, "s_axi_lite_clk");
2609 if (!lp->axi_clk) {
2610 /* For backward compatibility, if named AXI clock is not present,
2611 * treat the first clock specified as the AXI clock.
2612 */
2613 lp->axi_clk = devm_clk_get_optional(&pdev->dev, NULL);
2614 }
2615 if (IS_ERR(lp->axi_clk)) {
2616 ret = PTR_ERR(lp->axi_clk);
2617 goto free_netdev;
2618 }
2619 ret = clk_prepare_enable(lp->axi_clk);
2620 if (ret) {
2621 dev_err(&pdev->dev, "Unable to enable AXI clock: %d\n", ret);
2622 goto free_netdev;
2623 }
2624
2625 lp->misc_clks[0].id = "axis_clk";
2626 lp->misc_clks[1].id = "ref_clk";
2627 lp->misc_clks[2].id = "mgt_clk";
2628
2629 ret = devm_clk_bulk_get_optional(&pdev->dev, XAE_NUM_MISC_CLOCKS, lp->misc_clks);
2630 if (ret)
2631 goto cleanup_clk;
2632
2633 ret = clk_bulk_prepare_enable(XAE_NUM_MISC_CLOCKS, lp->misc_clks);
2634 if (ret)
2635 goto cleanup_clk;
2636
2637 /* Map device registers */
2638 lp->regs = devm_platform_get_and_ioremap_resource(pdev, 0, ðres);
2639 if (IS_ERR(lp->regs)) {
2640 ret = PTR_ERR(lp->regs);
2641 goto cleanup_clk;
2642 }
2643 lp->regs_start = ethres->start;
2644
2645 /* Setup checksum offload, but default to off if not specified */
2646 lp->features = 0;
2647
2648 if (axienet_ior(lp, XAE_ABILITY_OFFSET) & XAE_ABILITY_STATS)
2649 lp->features |= XAE_FEATURE_STATS;
2650
2651 ret = of_property_read_u32(pdev->dev.of_node, "xlnx,txcsum", &value);
2652 if (!ret) {
2653 switch (value) {
2654 case 1:
2655 lp->features |= XAE_FEATURE_PARTIAL_TX_CSUM;
2656 /* Can checksum any contiguous range */
2657 ndev->features |= NETIF_F_HW_CSUM;
2658 break;
2659 case 2:
2660 lp->features |= XAE_FEATURE_FULL_TX_CSUM;
2661 /* Can checksum TCP/UDP over IPv4. */
2662 ndev->features |= NETIF_F_IP_CSUM;
2663 break;
2664 }
2665 }
2666 ret = of_property_read_u32(pdev->dev.of_node, "xlnx,rxcsum", &value);
2667 if (!ret) {
2668 switch (value) {
2669 case 1:
2670 lp->features |= XAE_FEATURE_PARTIAL_RX_CSUM;
2671 ndev->features |= NETIF_F_RXCSUM;
2672 break;
2673 case 2:
2674 lp->features |= XAE_FEATURE_FULL_RX_CSUM;
2675 ndev->features |= NETIF_F_RXCSUM;
2676 break;
2677 }
2678 }
2679 /* For supporting jumbo frames, the Axi Ethernet hardware must have
2680 * a larger Rx/Tx Memory. Typically, the size must be large so that
2681 * we can enable jumbo option and start supporting jumbo frames.
2682 * Here we check for memory allocated for Rx/Tx in the hardware from
2683 * the device-tree and accordingly set flags.
2684 */
2685 of_property_read_u32(pdev->dev.of_node, "xlnx,rxmem", &lp->rxmem);
2686
2687 lp->switch_x_sgmii = of_property_read_bool(pdev->dev.of_node,
2688 "xlnx,switch-x-sgmii");
2689
2690 /* Start with the proprietary, and broken phy_type */
2691 ret = of_property_read_u32(pdev->dev.of_node, "xlnx,phy-type", &value);
2692 if (!ret) {
2693 netdev_warn(ndev, "Please upgrade your device tree binary blob to use phy-mode");
2694 switch (value) {
2695 case XAE_PHY_TYPE_MII:
2696 lp->phy_mode = PHY_INTERFACE_MODE_MII;
2697 break;
2698 case XAE_PHY_TYPE_GMII:
2699 lp->phy_mode = PHY_INTERFACE_MODE_GMII;
2700 break;
2701 case XAE_PHY_TYPE_RGMII_2_0:
2702 lp->phy_mode = PHY_INTERFACE_MODE_RGMII_ID;
2703 break;
2704 case XAE_PHY_TYPE_SGMII:
2705 lp->phy_mode = PHY_INTERFACE_MODE_SGMII;
2706 break;
2707 case XAE_PHY_TYPE_1000BASE_X:
2708 lp->phy_mode = PHY_INTERFACE_MODE_1000BASEX;
2709 break;
2710 default:
2711 ret = -EINVAL;
2712 goto cleanup_clk;
2713 }
2714 } else {
2715 ret = of_get_phy_mode(pdev->dev.of_node, &lp->phy_mode);
2716 if (ret)
2717 goto cleanup_clk;
2718 }
2719 if (lp->switch_x_sgmii && lp->phy_mode != PHY_INTERFACE_MODE_SGMII &&
2720 lp->phy_mode != PHY_INTERFACE_MODE_1000BASEX) {
2721 dev_err(&pdev->dev, "xlnx,switch-x-sgmii only supported with SGMII or 1000BaseX\n");
2722 ret = -EINVAL;
2723 goto cleanup_clk;
2724 }
2725
2726 if (!of_property_present(pdev->dev.of_node, "dmas")) {
2727 /* Find the DMA node, map the DMA registers, and decode the DMA IRQs */
2728 np = of_parse_phandle(pdev->dev.of_node, "axistream-connected", 0);
2729
2730 if (np) {
2731 struct resource dmares;
2732
2733 ret = of_address_to_resource(np, 0, &dmares);
2734 if (ret) {
2735 dev_err(&pdev->dev,
2736 "unable to get DMA resource\n");
2737 of_node_put(np);
2738 goto cleanup_clk;
2739 }
2740 lp->dma_regs = devm_ioremap_resource(&pdev->dev,
2741 &dmares);
2742 lp->rx_irq = irq_of_parse_and_map(np, 1);
2743 lp->tx_irq = irq_of_parse_and_map(np, 0);
2744 of_node_put(np);
2745 lp->eth_irq = platform_get_irq_optional(pdev, 0);
2746 } else {
2747 /* Check for these resources directly on the Ethernet node. */
2748 lp->dma_regs = devm_platform_get_and_ioremap_resource(pdev, 1, NULL);
2749 lp->rx_irq = platform_get_irq(pdev, 1);
2750 lp->tx_irq = platform_get_irq(pdev, 0);
2751 lp->eth_irq = platform_get_irq_optional(pdev, 2);
2752 }
2753 if (IS_ERR(lp->dma_regs)) {
2754 dev_err(&pdev->dev, "could not map DMA regs\n");
2755 ret = PTR_ERR(lp->dma_regs);
2756 goto cleanup_clk;
2757 }
2758 if (lp->rx_irq <= 0 || lp->tx_irq <= 0) {
2759 dev_err(&pdev->dev, "could not determine irqs\n");
2760 ret = -ENOMEM;
2761 goto cleanup_clk;
2762 }
2763
2764 /* Reset core now that clocks are enabled, prior to accessing MDIO */
2765 ret = __axienet_device_reset(lp);
2766 if (ret)
2767 goto cleanup_clk;
2768
2769 /* Autodetect the need for 64-bit DMA pointers.
2770 * When the IP is configured for a bus width bigger than 32 bits,
2771 * writing the MSB registers is mandatory, even if they are all 0.
2772 * We can detect this case by writing all 1's to one such register
2773 * and see if that sticks: when the IP is configured for 32 bits
2774 * only, those registers are RES0.
2775 * Those MSB registers were introduced in IP v7.1, which we check first.
2776 */
2777 if ((axienet_ior(lp, XAE_ID_OFFSET) >> 24) >= 0x9) {
2778 void __iomem *desc = lp->dma_regs + XAXIDMA_TX_CDESC_OFFSET + 4;
2779
2780 iowrite32(0x0, desc);
2781 if (ioread32(desc) == 0) { /* sanity check */
2782 iowrite32(0xffffffff, desc);
2783 if (ioread32(desc) > 0) {
2784 lp->features |= XAE_FEATURE_DMA_64BIT;
2785 addr_width = 64;
2786 dev_info(&pdev->dev,
2787 "autodetected 64-bit DMA range\n");
2788 }
2789 iowrite32(0x0, desc);
2790 }
2791 }
2792 if (!IS_ENABLED(CONFIG_64BIT) && lp->features & XAE_FEATURE_DMA_64BIT) {
2793 dev_err(&pdev->dev, "64-bit addressable DMA is not compatible with 32-bit archecture\n");
2794 ret = -EINVAL;
2795 goto cleanup_clk;
2796 }
2797
2798 ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(addr_width));
2799 if (ret) {
2800 dev_err(&pdev->dev, "No suitable DMA available\n");
2801 goto cleanup_clk;
2802 }
2803 netif_napi_add(ndev, &lp->napi_rx, axienet_rx_poll);
2804 netif_napi_add(ndev, &lp->napi_tx, axienet_tx_poll);
2805 } else {
2806 struct xilinx_vdma_config cfg;
2807 struct dma_chan *tx_chan;
2808
2809 lp->eth_irq = platform_get_irq_optional(pdev, 0);
2810 if (lp->eth_irq < 0 && lp->eth_irq != -ENXIO) {
2811 ret = lp->eth_irq;
2812 goto cleanup_clk;
2813 }
2814 tx_chan = dma_request_chan(lp->dev, "tx_chan0");
2815 if (IS_ERR(tx_chan)) {
2816 ret = PTR_ERR(tx_chan);
2817 dev_err_probe(lp->dev, ret, "No Ethernet DMA (TX) channel found\n");
2818 goto cleanup_clk;
2819 }
2820
2821 cfg.reset = 1;
2822 /* As name says VDMA but it has support for DMA channel reset */
2823 ret = xilinx_vdma_channel_set_config(tx_chan, &cfg);
2824 if (ret < 0) {
2825 dev_err(&pdev->dev, "Reset channel failed\n");
2826 dma_release_channel(tx_chan);
2827 goto cleanup_clk;
2828 }
2829
2830 dma_release_channel(tx_chan);
2831 lp->use_dmaengine = 1;
2832 }
2833
2834 if (lp->use_dmaengine)
2835 ndev->netdev_ops = &axienet_netdev_dmaengine_ops;
2836 else
2837 ndev->netdev_ops = &axienet_netdev_ops;
2838 /* Check for Ethernet core IRQ (optional) */
2839 if (lp->eth_irq <= 0)
2840 dev_info(&pdev->dev, "Ethernet core IRQ not defined\n");
2841
2842 /* Retrieve the MAC address */
2843 ret = of_get_mac_address(pdev->dev.of_node, mac_addr);
2844 if (!ret) {
2845 axienet_set_mac_address(ndev, mac_addr);
2846 } else {
2847 dev_warn(&pdev->dev, "could not find MAC address property: %d\n",
2848 ret);
2849 axienet_set_mac_address(ndev, NULL);
2850 }
2851
2852 lp->coalesce_count_rx = XAXIDMA_DFT_RX_THRESHOLD;
2853 lp->coalesce_count_tx = XAXIDMA_DFT_TX_THRESHOLD;
2854 lp->coalesce_usec_rx = XAXIDMA_DFT_RX_USEC;
2855 lp->coalesce_usec_tx = XAXIDMA_DFT_TX_USEC;
2856
2857 ret = axienet_mdio_setup(lp);
2858 if (ret)
2859 dev_warn(&pdev->dev,
2860 "error registering MDIO bus: %d\n", ret);
2861
2862 if (lp->phy_mode == PHY_INTERFACE_MODE_SGMII ||
2863 lp->phy_mode == PHY_INTERFACE_MODE_1000BASEX) {
2864 np = of_parse_phandle(pdev->dev.of_node, "pcs-handle", 0);
2865 if (!np) {
2866 /* Deprecated: Always use "pcs-handle" for pcs_phy.
2867 * Falling back to "phy-handle" here is only for
2868 * backward compatibility with old device trees.
2869 */
2870 np = of_parse_phandle(pdev->dev.of_node, "phy-handle", 0);
2871 }
2872 if (!np) {
2873 dev_err(&pdev->dev, "pcs-handle (preferred) or phy-handle required for 1000BaseX/SGMII\n");
2874 ret = -EINVAL;
2875 goto cleanup_mdio;
2876 }
2877 lp->pcs_phy = of_mdio_find_device(np);
2878 if (!lp->pcs_phy) {
2879 ret = -EPROBE_DEFER;
2880 of_node_put(np);
2881 goto cleanup_mdio;
2882 }
2883 of_node_put(np);
2884 lp->pcs.ops = &axienet_pcs_ops;
2885 lp->pcs.neg_mode = true;
2886 lp->pcs.poll = true;
2887 }
2888
2889 lp->phylink_config.dev = &ndev->dev;
2890 lp->phylink_config.type = PHYLINK_NETDEV;
2891 lp->phylink_config.mac_managed_pm = true;
2892 lp->phylink_config.mac_capabilities = MAC_SYM_PAUSE | MAC_ASYM_PAUSE |
2893 MAC_10FD | MAC_100FD | MAC_1000FD;
2894
2895 __set_bit(lp->phy_mode, lp->phylink_config.supported_interfaces);
2896 if (lp->switch_x_sgmii) {
2897 __set_bit(PHY_INTERFACE_MODE_1000BASEX,
2898 lp->phylink_config.supported_interfaces);
2899 __set_bit(PHY_INTERFACE_MODE_SGMII,
2900 lp->phylink_config.supported_interfaces);
2901 }
2902
2903 lp->phylink = phylink_create(&lp->phylink_config, pdev->dev.fwnode,
2904 lp->phy_mode,
2905 &axienet_phylink_ops);
2906 if (IS_ERR(lp->phylink)) {
2907 ret = PTR_ERR(lp->phylink);
2908 dev_err(&pdev->dev, "phylink_create error (%i)\n", ret);
2909 goto cleanup_mdio;
2910 }
2911
2912 ret = register_netdev(lp->ndev);
2913 if (ret) {
2914 dev_err(lp->dev, "register_netdev() error (%i)\n", ret);
2915 goto cleanup_phylink;
2916 }
2917
2918 return 0;
2919
2920cleanup_phylink:
2921 phylink_destroy(lp->phylink);
2922
2923cleanup_mdio:
2924 if (lp->pcs_phy)
2925 put_device(&lp->pcs_phy->dev);
2926 if (lp->mii_bus)
2927 axienet_mdio_teardown(lp);
2928cleanup_clk:
2929 clk_bulk_disable_unprepare(XAE_NUM_MISC_CLOCKS, lp->misc_clks);
2930 clk_disable_unprepare(lp->axi_clk);
2931
2932free_netdev:
2933 free_netdev(ndev);
2934
2935 return ret;
2936}
2937
2938static void axienet_remove(struct platform_device *pdev)
2939{
2940 struct net_device *ndev = platform_get_drvdata(pdev);
2941 struct axienet_local *lp = netdev_priv(ndev);
2942
2943 unregister_netdev(ndev);
2944
2945 if (lp->phylink)
2946 phylink_destroy(lp->phylink);
2947
2948 if (lp->pcs_phy)
2949 put_device(&lp->pcs_phy->dev);
2950
2951 axienet_mdio_teardown(lp);
2952
2953 clk_bulk_disable_unprepare(XAE_NUM_MISC_CLOCKS, lp->misc_clks);
2954 clk_disable_unprepare(lp->axi_clk);
2955
2956 free_netdev(ndev);
2957}
2958
2959static void axienet_shutdown(struct platform_device *pdev)
2960{
2961 struct net_device *ndev = platform_get_drvdata(pdev);
2962
2963 rtnl_lock();
2964 netif_device_detach(ndev);
2965
2966 if (netif_running(ndev))
2967 dev_close(ndev);
2968
2969 rtnl_unlock();
2970}
2971
2972static int axienet_suspend(struct device *dev)
2973{
2974 struct net_device *ndev = dev_get_drvdata(dev);
2975
2976 if (!netif_running(ndev))
2977 return 0;
2978
2979 netif_device_detach(ndev);
2980
2981 rtnl_lock();
2982 axienet_stop(ndev);
2983 rtnl_unlock();
2984
2985 return 0;
2986}
2987
2988static int axienet_resume(struct device *dev)
2989{
2990 struct net_device *ndev = dev_get_drvdata(dev);
2991
2992 if (!netif_running(ndev))
2993 return 0;
2994
2995 rtnl_lock();
2996 axienet_open(ndev);
2997 rtnl_unlock();
2998
2999 netif_device_attach(ndev);
3000
3001 return 0;
3002}
3003
3004static DEFINE_SIMPLE_DEV_PM_OPS(axienet_pm_ops,
3005 axienet_suspend, axienet_resume);
3006
3007static struct platform_driver axienet_driver = {
3008 .probe = axienet_probe,
3009 .remove = axienet_remove,
3010 .shutdown = axienet_shutdown,
3011 .driver = {
3012 .name = "xilinx_axienet",
3013 .pm = &axienet_pm_ops,
3014 .of_match_table = axienet_of_match,
3015 },
3016};
3017
3018module_platform_driver(axienet_driver);
3019
3020MODULE_DESCRIPTION("Xilinx Axi Ethernet driver");
3021MODULE_AUTHOR("Xilinx");
3022MODULE_LICENSE("GPL");
1/*
2 * Xilinx Axi Ethernet device driver
3 *
4 * Copyright (c) 2008 Nissin Systems Co., Ltd., Yoshio Kashiwagi
5 * Copyright (c) 2005-2008 DLA Systems, David H. Lynch Jr. <dhlii@dlasys.net>
6 * Copyright (c) 2008-2009 Secret Lab Technologies Ltd.
7 * Copyright (c) 2010 - 2011 Michal Simek <monstr@monstr.eu>
8 * Copyright (c) 2010 - 2011 PetaLogix
9 * Copyright (c) 2010 - 2012 Xilinx, Inc. All rights reserved.
10 *
11 * This is a driver for the Xilinx Axi Ethernet which is used in the Virtex6
12 * and Spartan6.
13 *
14 * TODO:
15 * - Add Axi Fifo support.
16 * - Factor out Axi DMA code into separate driver.
17 * - Test and fix basic multicast filtering.
18 * - Add support for extended multicast filtering.
19 * - Test basic VLAN support.
20 * - Add support for extended VLAN support.
21 */
22
23#include <linux/delay.h>
24#include <linux/etherdevice.h>
25#include <linux/module.h>
26#include <linux/netdevice.h>
27#include <linux/of_mdio.h>
28#include <linux/of_platform.h>
29#include <linux/of_irq.h>
30#include <linux/of_address.h>
31#include <linux/skbuff.h>
32#include <linux/spinlock.h>
33#include <linux/phy.h>
34#include <linux/mii.h>
35#include <linux/ethtool.h>
36
37#include "xilinx_axienet.h"
38
39/* Descriptors defines for Tx and Rx DMA - 2^n for the best performance */
40#define TX_BD_NUM 64
41#define RX_BD_NUM 128
42
43/* Must be shorter than length of ethtool_drvinfo.driver field to fit */
44#define DRIVER_NAME "xaxienet"
45#define DRIVER_DESCRIPTION "Xilinx Axi Ethernet driver"
46#define DRIVER_VERSION "1.00a"
47
48#define AXIENET_REGS_N 32
49
50/* Match table for of_platform binding */
51static struct of_device_id axienet_of_match[] = {
52 { .compatible = "xlnx,axi-ethernet-1.00.a", },
53 { .compatible = "xlnx,axi-ethernet-1.01.a", },
54 { .compatible = "xlnx,axi-ethernet-2.01.a", },
55 {},
56};
57
58MODULE_DEVICE_TABLE(of, axienet_of_match);
59
60/* Option table for setting up Axi Ethernet hardware options */
61static struct axienet_option axienet_options[] = {
62 /* Turn on jumbo packet support for both Rx and Tx */
63 {
64 .opt = XAE_OPTION_JUMBO,
65 .reg = XAE_TC_OFFSET,
66 .m_or = XAE_TC_JUM_MASK,
67 }, {
68 .opt = XAE_OPTION_JUMBO,
69 .reg = XAE_RCW1_OFFSET,
70 .m_or = XAE_RCW1_JUM_MASK,
71 }, { /* Turn on VLAN packet support for both Rx and Tx */
72 .opt = XAE_OPTION_VLAN,
73 .reg = XAE_TC_OFFSET,
74 .m_or = XAE_TC_VLAN_MASK,
75 }, {
76 .opt = XAE_OPTION_VLAN,
77 .reg = XAE_RCW1_OFFSET,
78 .m_or = XAE_RCW1_VLAN_MASK,
79 }, { /* Turn on FCS stripping on receive packets */
80 .opt = XAE_OPTION_FCS_STRIP,
81 .reg = XAE_RCW1_OFFSET,
82 .m_or = XAE_RCW1_FCS_MASK,
83 }, { /* Turn on FCS insertion on transmit packets */
84 .opt = XAE_OPTION_FCS_INSERT,
85 .reg = XAE_TC_OFFSET,
86 .m_or = XAE_TC_FCS_MASK,
87 }, { /* Turn off length/type field checking on receive packets */
88 .opt = XAE_OPTION_LENTYPE_ERR,
89 .reg = XAE_RCW1_OFFSET,
90 .m_or = XAE_RCW1_LT_DIS_MASK,
91 }, { /* Turn on Rx flow control */
92 .opt = XAE_OPTION_FLOW_CONTROL,
93 .reg = XAE_FCC_OFFSET,
94 .m_or = XAE_FCC_FCRX_MASK,
95 }, { /* Turn on Tx flow control */
96 .opt = XAE_OPTION_FLOW_CONTROL,
97 .reg = XAE_FCC_OFFSET,
98 .m_or = XAE_FCC_FCTX_MASK,
99 }, { /* Turn on promiscuous frame filtering */
100 .opt = XAE_OPTION_PROMISC,
101 .reg = XAE_FMI_OFFSET,
102 .m_or = XAE_FMI_PM_MASK,
103 }, { /* Enable transmitter */
104 .opt = XAE_OPTION_TXEN,
105 .reg = XAE_TC_OFFSET,
106 .m_or = XAE_TC_TX_MASK,
107 }, { /* Enable receiver */
108 .opt = XAE_OPTION_RXEN,
109 .reg = XAE_RCW1_OFFSET,
110 .m_or = XAE_RCW1_RX_MASK,
111 },
112 {}
113};
114
115/**
116 * axienet_dma_in32 - Memory mapped Axi DMA register read
117 * @lp: Pointer to axienet local structure
118 * @reg: Address offset from the base address of the Axi DMA core
119 *
120 * returns: The contents of the Axi DMA register
121 *
122 * This function returns the contents of the corresponding Axi DMA register.
123 */
124static inline u32 axienet_dma_in32(struct axienet_local *lp, off_t reg)
125{
126 return in_be32(lp->dma_regs + reg);
127}
128
129/**
130 * axienet_dma_out32 - Memory mapped Axi DMA register write.
131 * @lp: Pointer to axienet local structure
132 * @reg: Address offset from the base address of the Axi DMA core
133 * @value: Value to be written into the Axi DMA register
134 *
135 * This function writes the desired value into the corresponding Axi DMA
136 * register.
137 */
138static inline void axienet_dma_out32(struct axienet_local *lp,
139 off_t reg, u32 value)
140{
141 out_be32((lp->dma_regs + reg), value);
142}
143
144/**
145 * axienet_dma_bd_release - Release buffer descriptor rings
146 * @ndev: Pointer to the net_device structure
147 *
148 * This function is used to release the descriptors allocated in
149 * axienet_dma_bd_init. axienet_dma_bd_release is called when Axi Ethernet
150 * driver stop api is called.
151 */
152static void axienet_dma_bd_release(struct net_device *ndev)
153{
154 int i;
155 struct axienet_local *lp = netdev_priv(ndev);
156
157 for (i = 0; i < RX_BD_NUM; i++) {
158 dma_unmap_single(ndev->dev.parent, lp->rx_bd_v[i].phys,
159 lp->max_frm_size, DMA_FROM_DEVICE);
160 dev_kfree_skb((struct sk_buff *)
161 (lp->rx_bd_v[i].sw_id_offset));
162 }
163
164 if (lp->rx_bd_v) {
165 dma_free_coherent(ndev->dev.parent,
166 sizeof(*lp->rx_bd_v) * RX_BD_NUM,
167 lp->rx_bd_v,
168 lp->rx_bd_p);
169 }
170 if (lp->tx_bd_v) {
171 dma_free_coherent(ndev->dev.parent,
172 sizeof(*lp->tx_bd_v) * TX_BD_NUM,
173 lp->tx_bd_v,
174 lp->tx_bd_p);
175 }
176}
177
178/**
179 * axienet_dma_bd_init - Setup buffer descriptor rings for Axi DMA
180 * @ndev: Pointer to the net_device structure
181 *
182 * returns: 0, on success
183 * -ENOMEM, on failure
184 *
185 * This function is called to initialize the Rx and Tx DMA descriptor
186 * rings. This initializes the descriptors with required default values
187 * and is called when Axi Ethernet driver reset is called.
188 */
189static int axienet_dma_bd_init(struct net_device *ndev)
190{
191 u32 cr;
192 int i;
193 struct sk_buff *skb;
194 struct axienet_local *lp = netdev_priv(ndev);
195
196 /* Reset the indexes which are used for accessing the BDs */
197 lp->tx_bd_ci = 0;
198 lp->tx_bd_tail = 0;
199 lp->rx_bd_ci = 0;
200
201 /*
202 * Allocate the Tx and Rx buffer descriptors.
203 */
204 lp->tx_bd_v = dma_zalloc_coherent(ndev->dev.parent,
205 sizeof(*lp->tx_bd_v) * TX_BD_NUM,
206 &lp->tx_bd_p, GFP_KERNEL);
207 if (!lp->tx_bd_v)
208 goto out;
209
210 lp->rx_bd_v = dma_zalloc_coherent(ndev->dev.parent,
211 sizeof(*lp->rx_bd_v) * RX_BD_NUM,
212 &lp->rx_bd_p, GFP_KERNEL);
213 if (!lp->rx_bd_v)
214 goto out;
215
216 for (i = 0; i < TX_BD_NUM; i++) {
217 lp->tx_bd_v[i].next = lp->tx_bd_p +
218 sizeof(*lp->tx_bd_v) *
219 ((i + 1) % TX_BD_NUM);
220 }
221
222 for (i = 0; i < RX_BD_NUM; i++) {
223 lp->rx_bd_v[i].next = lp->rx_bd_p +
224 sizeof(*lp->rx_bd_v) *
225 ((i + 1) % RX_BD_NUM);
226
227 skb = netdev_alloc_skb_ip_align(ndev, lp->max_frm_size);
228 if (!skb)
229 goto out;
230
231 lp->rx_bd_v[i].sw_id_offset = (u32) skb;
232 lp->rx_bd_v[i].phys = dma_map_single(ndev->dev.parent,
233 skb->data,
234 lp->max_frm_size,
235 DMA_FROM_DEVICE);
236 lp->rx_bd_v[i].cntrl = lp->max_frm_size;
237 }
238
239 /* Start updating the Rx channel control register */
240 cr = axienet_dma_in32(lp, XAXIDMA_RX_CR_OFFSET);
241 /* Update the interrupt coalesce count */
242 cr = ((cr & ~XAXIDMA_COALESCE_MASK) |
243 ((lp->coalesce_count_rx) << XAXIDMA_COALESCE_SHIFT));
244 /* Update the delay timer count */
245 cr = ((cr & ~XAXIDMA_DELAY_MASK) |
246 (XAXIDMA_DFT_RX_WAITBOUND << XAXIDMA_DELAY_SHIFT));
247 /* Enable coalesce, delay timer and error interrupts */
248 cr |= XAXIDMA_IRQ_ALL_MASK;
249 /* Write to the Rx channel control register */
250 axienet_dma_out32(lp, XAXIDMA_RX_CR_OFFSET, cr);
251
252 /* Start updating the Tx channel control register */
253 cr = axienet_dma_in32(lp, XAXIDMA_TX_CR_OFFSET);
254 /* Update the interrupt coalesce count */
255 cr = (((cr & ~XAXIDMA_COALESCE_MASK)) |
256 ((lp->coalesce_count_tx) << XAXIDMA_COALESCE_SHIFT));
257 /* Update the delay timer count */
258 cr = (((cr & ~XAXIDMA_DELAY_MASK)) |
259 (XAXIDMA_DFT_TX_WAITBOUND << XAXIDMA_DELAY_SHIFT));
260 /* Enable coalesce, delay timer and error interrupts */
261 cr |= XAXIDMA_IRQ_ALL_MASK;
262 /* Write to the Tx channel control register */
263 axienet_dma_out32(lp, XAXIDMA_TX_CR_OFFSET, cr);
264
265 /* Populate the tail pointer and bring the Rx Axi DMA engine out of
266 * halted state. This will make the Rx side ready for reception.*/
267 axienet_dma_out32(lp, XAXIDMA_RX_CDESC_OFFSET, lp->rx_bd_p);
268 cr = axienet_dma_in32(lp, XAXIDMA_RX_CR_OFFSET);
269 axienet_dma_out32(lp, XAXIDMA_RX_CR_OFFSET,
270 cr | XAXIDMA_CR_RUNSTOP_MASK);
271 axienet_dma_out32(lp, XAXIDMA_RX_TDESC_OFFSET, lp->rx_bd_p +
272 (sizeof(*lp->rx_bd_v) * (RX_BD_NUM - 1)));
273
274 /* Write to the RS (Run-stop) bit in the Tx channel control register.
275 * Tx channel is now ready to run. But only after we write to the
276 * tail pointer register that the Tx channel will start transmitting */
277 axienet_dma_out32(lp, XAXIDMA_TX_CDESC_OFFSET, lp->tx_bd_p);
278 cr = axienet_dma_in32(lp, XAXIDMA_TX_CR_OFFSET);
279 axienet_dma_out32(lp, XAXIDMA_TX_CR_OFFSET,
280 cr | XAXIDMA_CR_RUNSTOP_MASK);
281
282 return 0;
283out:
284 axienet_dma_bd_release(ndev);
285 return -ENOMEM;
286}
287
288/**
289 * axienet_set_mac_address - Write the MAC address
290 * @ndev: Pointer to the net_device structure
291 * @address: 6 byte Address to be written as MAC address
292 *
293 * This function is called to initialize the MAC address of the Axi Ethernet
294 * core. It writes to the UAW0 and UAW1 registers of the core.
295 */
296static void axienet_set_mac_address(struct net_device *ndev, void *address)
297{
298 struct axienet_local *lp = netdev_priv(ndev);
299
300 if (address)
301 memcpy(ndev->dev_addr, address, ETH_ALEN);
302 if (!is_valid_ether_addr(ndev->dev_addr))
303 eth_random_addr(ndev->dev_addr);
304
305 /* Set up unicast MAC address filter set its mac address */
306 axienet_iow(lp, XAE_UAW0_OFFSET,
307 (ndev->dev_addr[0]) |
308 (ndev->dev_addr[1] << 8) |
309 (ndev->dev_addr[2] << 16) |
310 (ndev->dev_addr[3] << 24));
311 axienet_iow(lp, XAE_UAW1_OFFSET,
312 (((axienet_ior(lp, XAE_UAW1_OFFSET)) &
313 ~XAE_UAW1_UNICASTADDR_MASK) |
314 (ndev->dev_addr[4] |
315 (ndev->dev_addr[5] << 8))));
316}
317
318/**
319 * netdev_set_mac_address - Write the MAC address (from outside the driver)
320 * @ndev: Pointer to the net_device structure
321 * @p: 6 byte Address to be written as MAC address
322 *
323 * returns: 0 for all conditions. Presently, there is no failure case.
324 *
325 * This function is called to initialize the MAC address of the Axi Ethernet
326 * core. It calls the core specific axienet_set_mac_address. This is the
327 * function that goes into net_device_ops structure entry ndo_set_mac_address.
328 */
329static int netdev_set_mac_address(struct net_device *ndev, void *p)
330{
331 struct sockaddr *addr = p;
332 axienet_set_mac_address(ndev, addr->sa_data);
333 return 0;
334}
335
336/**
337 * axienet_set_multicast_list - Prepare the multicast table
338 * @ndev: Pointer to the net_device structure
339 *
340 * This function is called to initialize the multicast table during
341 * initialization. The Axi Ethernet basic multicast support has a four-entry
342 * multicast table which is initialized here. Additionally this function
343 * goes into the net_device_ops structure entry ndo_set_multicast_list. This
344 * means whenever the multicast table entries need to be updated this
345 * function gets called.
346 */
347static void axienet_set_multicast_list(struct net_device *ndev)
348{
349 int i;
350 u32 reg, af0reg, af1reg;
351 struct axienet_local *lp = netdev_priv(ndev);
352
353 if (ndev->flags & (IFF_ALLMULTI | IFF_PROMISC) ||
354 netdev_mc_count(ndev) > XAE_MULTICAST_CAM_TABLE_NUM) {
355 /* We must make the kernel realize we had to move into
356 * promiscuous mode. If it was a promiscuous mode request
357 * the flag is already set. If not we set it. */
358 ndev->flags |= IFF_PROMISC;
359 reg = axienet_ior(lp, XAE_FMI_OFFSET);
360 reg |= XAE_FMI_PM_MASK;
361 axienet_iow(lp, XAE_FMI_OFFSET, reg);
362 dev_info(&ndev->dev, "Promiscuous mode enabled.\n");
363 } else if (!netdev_mc_empty(ndev)) {
364 struct netdev_hw_addr *ha;
365
366 i = 0;
367 netdev_for_each_mc_addr(ha, ndev) {
368 if (i >= XAE_MULTICAST_CAM_TABLE_NUM)
369 break;
370
371 af0reg = (ha->addr[0]);
372 af0reg |= (ha->addr[1] << 8);
373 af0reg |= (ha->addr[2] << 16);
374 af0reg |= (ha->addr[3] << 24);
375
376 af1reg = (ha->addr[4]);
377 af1reg |= (ha->addr[5] << 8);
378
379 reg = axienet_ior(lp, XAE_FMI_OFFSET) & 0xFFFFFF00;
380 reg |= i;
381
382 axienet_iow(lp, XAE_FMI_OFFSET, reg);
383 axienet_iow(lp, XAE_AF0_OFFSET, af0reg);
384 axienet_iow(lp, XAE_AF1_OFFSET, af1reg);
385 i++;
386 }
387 } else {
388 reg = axienet_ior(lp, XAE_FMI_OFFSET);
389 reg &= ~XAE_FMI_PM_MASK;
390
391 axienet_iow(lp, XAE_FMI_OFFSET, reg);
392
393 for (i = 0; i < XAE_MULTICAST_CAM_TABLE_NUM; i++) {
394 reg = axienet_ior(lp, XAE_FMI_OFFSET) & 0xFFFFFF00;
395 reg |= i;
396
397 axienet_iow(lp, XAE_FMI_OFFSET, reg);
398 axienet_iow(lp, XAE_AF0_OFFSET, 0);
399 axienet_iow(lp, XAE_AF1_OFFSET, 0);
400 }
401
402 dev_info(&ndev->dev, "Promiscuous mode disabled.\n");
403 }
404}
405
406/**
407 * axienet_setoptions - Set an Axi Ethernet option
408 * @ndev: Pointer to the net_device structure
409 * @options: Option to be enabled/disabled
410 *
411 * The Axi Ethernet core has multiple features which can be selectively turned
412 * on or off. The typical options could be jumbo frame option, basic VLAN
413 * option, promiscuous mode option etc. This function is used to set or clear
414 * these options in the Axi Ethernet hardware. This is done through
415 * axienet_option structure .
416 */
417static void axienet_setoptions(struct net_device *ndev, u32 options)
418{
419 int reg;
420 struct axienet_local *lp = netdev_priv(ndev);
421 struct axienet_option *tp = &axienet_options[0];
422
423 while (tp->opt) {
424 reg = ((axienet_ior(lp, tp->reg)) & ~(tp->m_or));
425 if (options & tp->opt)
426 reg |= tp->m_or;
427 axienet_iow(lp, tp->reg, reg);
428 tp++;
429 }
430
431 lp->options |= options;
432}
433
434static void __axienet_device_reset(struct axienet_local *lp,
435 struct device *dev, off_t offset)
436{
437 u32 timeout;
438 /* Reset Axi DMA. This would reset Axi Ethernet core as well. The reset
439 * process of Axi DMA takes a while to complete as all pending
440 * commands/transfers will be flushed or completed during this
441 * reset process. */
442 axienet_dma_out32(lp, offset, XAXIDMA_CR_RESET_MASK);
443 timeout = DELAY_OF_ONE_MILLISEC;
444 while (axienet_dma_in32(lp, offset) & XAXIDMA_CR_RESET_MASK) {
445 udelay(1);
446 if (--timeout == 0) {
447 dev_err(dev, "axienet_device_reset DMA "
448 "reset timeout!\n");
449 break;
450 }
451 }
452}
453
454/**
455 * axienet_device_reset - Reset and initialize the Axi Ethernet hardware.
456 * @ndev: Pointer to the net_device structure
457 *
458 * This function is called to reset and initialize the Axi Ethernet core. This
459 * is typically called during initialization. It does a reset of the Axi DMA
460 * Rx/Tx channels and initializes the Axi DMA BDs. Since Axi DMA reset lines
461 * areconnected to Axi Ethernet reset lines, this in turn resets the Axi
462 * Ethernet core. No separate hardware reset is done for the Axi Ethernet
463 * core.
464 */
465static void axienet_device_reset(struct net_device *ndev)
466{
467 u32 axienet_status;
468 struct axienet_local *lp = netdev_priv(ndev);
469
470 __axienet_device_reset(lp, &ndev->dev, XAXIDMA_TX_CR_OFFSET);
471 __axienet_device_reset(lp, &ndev->dev, XAXIDMA_RX_CR_OFFSET);
472
473 lp->max_frm_size = XAE_MAX_VLAN_FRAME_SIZE;
474 lp->options &= (~XAE_OPTION_JUMBO);
475
476 if ((ndev->mtu > XAE_MTU) &&
477 (ndev->mtu <= XAE_JUMBO_MTU) &&
478 (lp->jumbo_support)) {
479 lp->max_frm_size = ndev->mtu + XAE_HDR_VLAN_SIZE +
480 XAE_TRL_SIZE;
481 lp->options |= XAE_OPTION_JUMBO;
482 }
483
484 if (axienet_dma_bd_init(ndev)) {
485 dev_err(&ndev->dev, "axienet_device_reset descriptor "
486 "allocation failed\n");
487 }
488
489 axienet_status = axienet_ior(lp, XAE_RCW1_OFFSET);
490 axienet_status &= ~XAE_RCW1_RX_MASK;
491 axienet_iow(lp, XAE_RCW1_OFFSET, axienet_status);
492
493 axienet_status = axienet_ior(lp, XAE_IP_OFFSET);
494 if (axienet_status & XAE_INT_RXRJECT_MASK)
495 axienet_iow(lp, XAE_IS_OFFSET, XAE_INT_RXRJECT_MASK);
496
497 axienet_iow(lp, XAE_FCC_OFFSET, XAE_FCC_FCRX_MASK);
498
499 /* Sync default options with HW but leave receiver and
500 * transmitter disabled.*/
501 axienet_setoptions(ndev, lp->options &
502 ~(XAE_OPTION_TXEN | XAE_OPTION_RXEN));
503 axienet_set_mac_address(ndev, NULL);
504 axienet_set_multicast_list(ndev);
505 axienet_setoptions(ndev, lp->options);
506
507 ndev->trans_start = jiffies;
508}
509
510/**
511 * axienet_adjust_link - Adjust the PHY link speed/duplex.
512 * @ndev: Pointer to the net_device structure
513 *
514 * This function is called to change the speed and duplex setting after
515 * auto negotiation is done by the PHY. This is the function that gets
516 * registered with the PHY interface through the "of_phy_connect" call.
517 */
518static void axienet_adjust_link(struct net_device *ndev)
519{
520 u32 emmc_reg;
521 u32 link_state;
522 u32 setspeed = 1;
523 struct axienet_local *lp = netdev_priv(ndev);
524 struct phy_device *phy = lp->phy_dev;
525
526 link_state = phy->speed | (phy->duplex << 1) | phy->link;
527 if (lp->last_link != link_state) {
528 if ((phy->speed == SPEED_10) || (phy->speed == SPEED_100)) {
529 if (lp->phy_type == XAE_PHY_TYPE_1000BASE_X)
530 setspeed = 0;
531 } else {
532 if ((phy->speed == SPEED_1000) &&
533 (lp->phy_type == XAE_PHY_TYPE_MII))
534 setspeed = 0;
535 }
536
537 if (setspeed == 1) {
538 emmc_reg = axienet_ior(lp, XAE_EMMC_OFFSET);
539 emmc_reg &= ~XAE_EMMC_LINKSPEED_MASK;
540
541 switch (phy->speed) {
542 case SPEED_1000:
543 emmc_reg |= XAE_EMMC_LINKSPD_1000;
544 break;
545 case SPEED_100:
546 emmc_reg |= XAE_EMMC_LINKSPD_100;
547 break;
548 case SPEED_10:
549 emmc_reg |= XAE_EMMC_LINKSPD_10;
550 break;
551 default:
552 dev_err(&ndev->dev, "Speed other than 10, 100 "
553 "or 1Gbps is not supported\n");
554 break;
555 }
556
557 axienet_iow(lp, XAE_EMMC_OFFSET, emmc_reg);
558 lp->last_link = link_state;
559 phy_print_status(phy);
560 } else {
561 dev_err(&ndev->dev, "Error setting Axi Ethernet "
562 "mac speed\n");
563 }
564 }
565}
566
567/**
568 * axienet_start_xmit_done - Invoked once a transmit is completed by the
569 * Axi DMA Tx channel.
570 * @ndev: Pointer to the net_device structure
571 *
572 * This function is invoked from the Axi DMA Tx isr to notify the completion
573 * of transmit operation. It clears fields in the corresponding Tx BDs and
574 * unmaps the corresponding buffer so that CPU can regain ownership of the
575 * buffer. It finally invokes "netif_wake_queue" to restart transmission if
576 * required.
577 */
578static void axienet_start_xmit_done(struct net_device *ndev)
579{
580 u32 size = 0;
581 u32 packets = 0;
582 struct axienet_local *lp = netdev_priv(ndev);
583 struct axidma_bd *cur_p;
584 unsigned int status = 0;
585
586 cur_p = &lp->tx_bd_v[lp->tx_bd_ci];
587 status = cur_p->status;
588 while (status & XAXIDMA_BD_STS_COMPLETE_MASK) {
589 dma_unmap_single(ndev->dev.parent, cur_p->phys,
590 (cur_p->cntrl & XAXIDMA_BD_CTRL_LENGTH_MASK),
591 DMA_TO_DEVICE);
592 if (cur_p->app4)
593 dev_kfree_skb_irq((struct sk_buff *)cur_p->app4);
594 /*cur_p->phys = 0;*/
595 cur_p->app0 = 0;
596 cur_p->app1 = 0;
597 cur_p->app2 = 0;
598 cur_p->app4 = 0;
599 cur_p->status = 0;
600
601 size += status & XAXIDMA_BD_STS_ACTUAL_LEN_MASK;
602 packets++;
603
604 ++lp->tx_bd_ci;
605 lp->tx_bd_ci %= TX_BD_NUM;
606 cur_p = &lp->tx_bd_v[lp->tx_bd_ci];
607 status = cur_p->status;
608 }
609
610 ndev->stats.tx_packets += packets;
611 ndev->stats.tx_bytes += size;
612 netif_wake_queue(ndev);
613}
614
615/**
616 * axienet_check_tx_bd_space - Checks if a BD/group of BDs are currently busy
617 * @lp: Pointer to the axienet_local structure
618 * @num_frag: The number of BDs to check for
619 *
620 * returns: 0, on success
621 * NETDEV_TX_BUSY, if any of the descriptors are not free
622 *
623 * This function is invoked before BDs are allocated and transmission starts.
624 * This function returns 0 if a BD or group of BDs can be allocated for
625 * transmission. If the BD or any of the BDs are not free the function
626 * returns a busy status. This is invoked from axienet_start_xmit.
627 */
628static inline int axienet_check_tx_bd_space(struct axienet_local *lp,
629 int num_frag)
630{
631 struct axidma_bd *cur_p;
632 cur_p = &lp->tx_bd_v[(lp->tx_bd_tail + num_frag) % TX_BD_NUM];
633 if (cur_p->status & XAXIDMA_BD_STS_ALL_MASK)
634 return NETDEV_TX_BUSY;
635 return 0;
636}
637
638/**
639 * axienet_start_xmit - Starts the transmission.
640 * @skb: sk_buff pointer that contains data to be Txed.
641 * @ndev: Pointer to net_device structure.
642 *
643 * returns: NETDEV_TX_OK, on success
644 * NETDEV_TX_BUSY, if any of the descriptors are not free
645 *
646 * This function is invoked from upper layers to initiate transmission. The
647 * function uses the next available free BDs and populates their fields to
648 * start the transmission. Additionally if checksum offloading is supported,
649 * it populates AXI Stream Control fields with appropriate values.
650 */
651static int axienet_start_xmit(struct sk_buff *skb, struct net_device *ndev)
652{
653 u32 ii;
654 u32 num_frag;
655 u32 csum_start_off;
656 u32 csum_index_off;
657 skb_frag_t *frag;
658 dma_addr_t tail_p;
659 struct axienet_local *lp = netdev_priv(ndev);
660 struct axidma_bd *cur_p;
661
662 num_frag = skb_shinfo(skb)->nr_frags;
663 cur_p = &lp->tx_bd_v[lp->tx_bd_tail];
664
665 if (axienet_check_tx_bd_space(lp, num_frag)) {
666 if (!netif_queue_stopped(ndev))
667 netif_stop_queue(ndev);
668 return NETDEV_TX_BUSY;
669 }
670
671 if (skb->ip_summed == CHECKSUM_PARTIAL) {
672 if (lp->features & XAE_FEATURE_FULL_TX_CSUM) {
673 /* Tx Full Checksum Offload Enabled */
674 cur_p->app0 |= 2;
675 } else if (lp->features & XAE_FEATURE_PARTIAL_RX_CSUM) {
676 csum_start_off = skb_transport_offset(skb);
677 csum_index_off = csum_start_off + skb->csum_offset;
678 /* Tx Partial Checksum Offload Enabled */
679 cur_p->app0 |= 1;
680 cur_p->app1 = (csum_start_off << 16) | csum_index_off;
681 }
682 } else if (skb->ip_summed == CHECKSUM_UNNECESSARY) {
683 cur_p->app0 |= 2; /* Tx Full Checksum Offload Enabled */
684 }
685
686 cur_p->cntrl = skb_headlen(skb) | XAXIDMA_BD_CTRL_TXSOF_MASK;
687 cur_p->phys = dma_map_single(ndev->dev.parent, skb->data,
688 skb_headlen(skb), DMA_TO_DEVICE);
689
690 for (ii = 0; ii < num_frag; ii++) {
691 ++lp->tx_bd_tail;
692 lp->tx_bd_tail %= TX_BD_NUM;
693 cur_p = &lp->tx_bd_v[lp->tx_bd_tail];
694 frag = &skb_shinfo(skb)->frags[ii];
695 cur_p->phys = dma_map_single(ndev->dev.parent,
696 skb_frag_address(frag),
697 skb_frag_size(frag),
698 DMA_TO_DEVICE);
699 cur_p->cntrl = skb_frag_size(frag);
700 }
701
702 cur_p->cntrl |= XAXIDMA_BD_CTRL_TXEOF_MASK;
703 cur_p->app4 = (unsigned long)skb;
704
705 tail_p = lp->tx_bd_p + sizeof(*lp->tx_bd_v) * lp->tx_bd_tail;
706 /* Start the transfer */
707 axienet_dma_out32(lp, XAXIDMA_TX_TDESC_OFFSET, tail_p);
708 ++lp->tx_bd_tail;
709 lp->tx_bd_tail %= TX_BD_NUM;
710
711 return NETDEV_TX_OK;
712}
713
714/**
715 * axienet_recv - Is called from Axi DMA Rx Isr to complete the received
716 * BD processing.
717 * @ndev: Pointer to net_device structure.
718 *
719 * This function is invoked from the Axi DMA Rx isr to process the Rx BDs. It
720 * does minimal processing and invokes "netif_rx" to complete further
721 * processing.
722 */
723static void axienet_recv(struct net_device *ndev)
724{
725 u32 length;
726 u32 csumstatus;
727 u32 size = 0;
728 u32 packets = 0;
729 dma_addr_t tail_p;
730 struct axienet_local *lp = netdev_priv(ndev);
731 struct sk_buff *skb, *new_skb;
732 struct axidma_bd *cur_p;
733
734 tail_p = lp->rx_bd_p + sizeof(*lp->rx_bd_v) * lp->rx_bd_ci;
735 cur_p = &lp->rx_bd_v[lp->rx_bd_ci];
736
737 while ((cur_p->status & XAXIDMA_BD_STS_COMPLETE_MASK)) {
738 skb = (struct sk_buff *) (cur_p->sw_id_offset);
739 length = cur_p->app4 & 0x0000FFFF;
740
741 dma_unmap_single(ndev->dev.parent, cur_p->phys,
742 lp->max_frm_size,
743 DMA_FROM_DEVICE);
744
745 skb_put(skb, length);
746 skb->protocol = eth_type_trans(skb, ndev);
747 /*skb_checksum_none_assert(skb);*/
748 skb->ip_summed = CHECKSUM_NONE;
749
750 /* if we're doing Rx csum offload, set it up */
751 if (lp->features & XAE_FEATURE_FULL_RX_CSUM) {
752 csumstatus = (cur_p->app2 &
753 XAE_FULL_CSUM_STATUS_MASK) >> 3;
754 if ((csumstatus == XAE_IP_TCP_CSUM_VALIDATED) ||
755 (csumstatus == XAE_IP_UDP_CSUM_VALIDATED)) {
756 skb->ip_summed = CHECKSUM_UNNECESSARY;
757 }
758 } else if ((lp->features & XAE_FEATURE_PARTIAL_RX_CSUM) != 0 &&
759 skb->protocol == htons(ETH_P_IP) &&
760 skb->len > 64) {
761 skb->csum = be32_to_cpu(cur_p->app3 & 0xFFFF);
762 skb->ip_summed = CHECKSUM_COMPLETE;
763 }
764
765 netif_rx(skb);
766
767 size += length;
768 packets++;
769
770 new_skb = netdev_alloc_skb_ip_align(ndev, lp->max_frm_size);
771 if (!new_skb)
772 return;
773
774 cur_p->phys = dma_map_single(ndev->dev.parent, new_skb->data,
775 lp->max_frm_size,
776 DMA_FROM_DEVICE);
777 cur_p->cntrl = lp->max_frm_size;
778 cur_p->status = 0;
779 cur_p->sw_id_offset = (u32) new_skb;
780
781 ++lp->rx_bd_ci;
782 lp->rx_bd_ci %= RX_BD_NUM;
783 cur_p = &lp->rx_bd_v[lp->rx_bd_ci];
784 }
785
786 ndev->stats.rx_packets += packets;
787 ndev->stats.rx_bytes += size;
788
789 axienet_dma_out32(lp, XAXIDMA_RX_TDESC_OFFSET, tail_p);
790}
791
792/**
793 * axienet_tx_irq - Tx Done Isr.
794 * @irq: irq number
795 * @_ndev: net_device pointer
796 *
797 * returns: IRQ_HANDLED for all cases.
798 *
799 * This is the Axi DMA Tx done Isr. It invokes "axienet_start_xmit_done"
800 * to complete the BD processing.
801 */
802static irqreturn_t axienet_tx_irq(int irq, void *_ndev)
803{
804 u32 cr;
805 unsigned int status;
806 struct net_device *ndev = _ndev;
807 struct axienet_local *lp = netdev_priv(ndev);
808
809 status = axienet_dma_in32(lp, XAXIDMA_TX_SR_OFFSET);
810 if (status & (XAXIDMA_IRQ_IOC_MASK | XAXIDMA_IRQ_DELAY_MASK)) {
811 axienet_start_xmit_done(lp->ndev);
812 goto out;
813 }
814 if (!(status & XAXIDMA_IRQ_ALL_MASK))
815 dev_err(&ndev->dev, "No interrupts asserted in Tx path");
816 if (status & XAXIDMA_IRQ_ERROR_MASK) {
817 dev_err(&ndev->dev, "DMA Tx error 0x%x\n", status);
818 dev_err(&ndev->dev, "Current BD is at: 0x%x\n",
819 (lp->tx_bd_v[lp->tx_bd_ci]).phys);
820
821 cr = axienet_dma_in32(lp, XAXIDMA_TX_CR_OFFSET);
822 /* Disable coalesce, delay timer and error interrupts */
823 cr &= (~XAXIDMA_IRQ_ALL_MASK);
824 /* Write to the Tx channel control register */
825 axienet_dma_out32(lp, XAXIDMA_TX_CR_OFFSET, cr);
826
827 cr = axienet_dma_in32(lp, XAXIDMA_RX_CR_OFFSET);
828 /* Disable coalesce, delay timer and error interrupts */
829 cr &= (~XAXIDMA_IRQ_ALL_MASK);
830 /* Write to the Rx channel control register */
831 axienet_dma_out32(lp, XAXIDMA_RX_CR_OFFSET, cr);
832
833 tasklet_schedule(&lp->dma_err_tasklet);
834 }
835out:
836 axienet_dma_out32(lp, XAXIDMA_TX_SR_OFFSET, status);
837 return IRQ_HANDLED;
838}
839
840/**
841 * axienet_rx_irq - Rx Isr.
842 * @irq: irq number
843 * @_ndev: net_device pointer
844 *
845 * returns: IRQ_HANDLED for all cases.
846 *
847 * This is the Axi DMA Rx Isr. It invokes "axienet_recv" to complete the BD
848 * processing.
849 */
850static irqreturn_t axienet_rx_irq(int irq, void *_ndev)
851{
852 u32 cr;
853 unsigned int status;
854 struct net_device *ndev = _ndev;
855 struct axienet_local *lp = netdev_priv(ndev);
856
857 status = axienet_dma_in32(lp, XAXIDMA_RX_SR_OFFSET);
858 if (status & (XAXIDMA_IRQ_IOC_MASK | XAXIDMA_IRQ_DELAY_MASK)) {
859 axienet_recv(lp->ndev);
860 goto out;
861 }
862 if (!(status & XAXIDMA_IRQ_ALL_MASK))
863 dev_err(&ndev->dev, "No interrupts asserted in Rx path");
864 if (status & XAXIDMA_IRQ_ERROR_MASK) {
865 dev_err(&ndev->dev, "DMA Rx error 0x%x\n", status);
866 dev_err(&ndev->dev, "Current BD is at: 0x%x\n",
867 (lp->rx_bd_v[lp->rx_bd_ci]).phys);
868
869 cr = axienet_dma_in32(lp, XAXIDMA_TX_CR_OFFSET);
870 /* Disable coalesce, delay timer and error interrupts */
871 cr &= (~XAXIDMA_IRQ_ALL_MASK);
872 /* Finally write to the Tx channel control register */
873 axienet_dma_out32(lp, XAXIDMA_TX_CR_OFFSET, cr);
874
875 cr = axienet_dma_in32(lp, XAXIDMA_RX_CR_OFFSET);
876 /* Disable coalesce, delay timer and error interrupts */
877 cr &= (~XAXIDMA_IRQ_ALL_MASK);
878 /* write to the Rx channel control register */
879 axienet_dma_out32(lp, XAXIDMA_RX_CR_OFFSET, cr);
880
881 tasklet_schedule(&lp->dma_err_tasklet);
882 }
883out:
884 axienet_dma_out32(lp, XAXIDMA_RX_SR_OFFSET, status);
885 return IRQ_HANDLED;
886}
887
888static void axienet_dma_err_handler(unsigned long data);
889
890/**
891 * axienet_open - Driver open routine.
892 * @ndev: Pointer to net_device structure
893 *
894 * returns: 0, on success.
895 * -ENODEV, if PHY cannot be connected to
896 * non-zero error value on failure
897 *
898 * This is the driver open routine. It calls phy_start to start the PHY device.
899 * It also allocates interrupt service routines, enables the interrupt lines
900 * and ISR handling. Axi Ethernet core is reset through Axi DMA core. Buffer
901 * descriptors are initialized.
902 */
903static int axienet_open(struct net_device *ndev)
904{
905 int ret, mdio_mcreg;
906 struct axienet_local *lp = netdev_priv(ndev);
907
908 dev_dbg(&ndev->dev, "axienet_open()\n");
909
910 mdio_mcreg = axienet_ior(lp, XAE_MDIO_MC_OFFSET);
911 ret = axienet_mdio_wait_until_ready(lp);
912 if (ret < 0)
913 return ret;
914 /* Disable the MDIO interface till Axi Ethernet Reset is completed.
915 * When we do an Axi Ethernet reset, it resets the complete core
916 * including the MDIO. If MDIO is not disabled when the reset
917 * process is started, MDIO will be broken afterwards. */
918 axienet_iow(lp, XAE_MDIO_MC_OFFSET,
919 (mdio_mcreg & (~XAE_MDIO_MC_MDIOEN_MASK)));
920 axienet_device_reset(ndev);
921 /* Enable the MDIO */
922 axienet_iow(lp, XAE_MDIO_MC_OFFSET, mdio_mcreg);
923 ret = axienet_mdio_wait_until_ready(lp);
924 if (ret < 0)
925 return ret;
926
927 if (lp->phy_node) {
928 lp->phy_dev = of_phy_connect(lp->ndev, lp->phy_node,
929 axienet_adjust_link, 0,
930 PHY_INTERFACE_MODE_GMII);
931 if (!lp->phy_dev) {
932 dev_err(lp->dev, "of_phy_connect() failed\n");
933 return -ENODEV;
934 }
935 phy_start(lp->phy_dev);
936 }
937
938 /* Enable tasklets for Axi DMA error handling */
939 tasklet_init(&lp->dma_err_tasklet, axienet_dma_err_handler,
940 (unsigned long) lp);
941
942 /* Enable interrupts for Axi DMA Tx */
943 ret = request_irq(lp->tx_irq, axienet_tx_irq, 0, ndev->name, ndev);
944 if (ret)
945 goto err_tx_irq;
946 /* Enable interrupts for Axi DMA Rx */
947 ret = request_irq(lp->rx_irq, axienet_rx_irq, 0, ndev->name, ndev);
948 if (ret)
949 goto err_rx_irq;
950
951 return 0;
952
953err_rx_irq:
954 free_irq(lp->tx_irq, ndev);
955err_tx_irq:
956 if (lp->phy_dev)
957 phy_disconnect(lp->phy_dev);
958 lp->phy_dev = NULL;
959 tasklet_kill(&lp->dma_err_tasklet);
960 dev_err(lp->dev, "request_irq() failed\n");
961 return ret;
962}
963
964/**
965 * axienet_stop - Driver stop routine.
966 * @ndev: Pointer to net_device structure
967 *
968 * returns: 0, on success.
969 *
970 * This is the driver stop routine. It calls phy_disconnect to stop the PHY
971 * device. It also removes the interrupt handlers and disables the interrupts.
972 * The Axi DMA Tx/Rx BDs are released.
973 */
974static int axienet_stop(struct net_device *ndev)
975{
976 u32 cr;
977 struct axienet_local *lp = netdev_priv(ndev);
978
979 dev_dbg(&ndev->dev, "axienet_close()\n");
980
981 cr = axienet_dma_in32(lp, XAXIDMA_RX_CR_OFFSET);
982 axienet_dma_out32(lp, XAXIDMA_RX_CR_OFFSET,
983 cr & (~XAXIDMA_CR_RUNSTOP_MASK));
984 cr = axienet_dma_in32(lp, XAXIDMA_TX_CR_OFFSET);
985 axienet_dma_out32(lp, XAXIDMA_TX_CR_OFFSET,
986 cr & (~XAXIDMA_CR_RUNSTOP_MASK));
987 axienet_setoptions(ndev, lp->options &
988 ~(XAE_OPTION_TXEN | XAE_OPTION_RXEN));
989
990 tasklet_kill(&lp->dma_err_tasklet);
991
992 free_irq(lp->tx_irq, ndev);
993 free_irq(lp->rx_irq, ndev);
994
995 if (lp->phy_dev)
996 phy_disconnect(lp->phy_dev);
997 lp->phy_dev = NULL;
998
999 axienet_dma_bd_release(ndev);
1000 return 0;
1001}
1002
1003/**
1004 * axienet_change_mtu - Driver change mtu routine.
1005 * @ndev: Pointer to net_device structure
1006 * @new_mtu: New mtu value to be applied
1007 *
1008 * returns: Always returns 0 (success).
1009 *
1010 * This is the change mtu driver routine. It checks if the Axi Ethernet
1011 * hardware supports jumbo frames before changing the mtu. This can be
1012 * called only when the device is not up.
1013 */
1014static int axienet_change_mtu(struct net_device *ndev, int new_mtu)
1015{
1016 struct axienet_local *lp = netdev_priv(ndev);
1017
1018 if (netif_running(ndev))
1019 return -EBUSY;
1020 if (lp->jumbo_support) {
1021 if ((new_mtu > XAE_JUMBO_MTU) || (new_mtu < 64))
1022 return -EINVAL;
1023 ndev->mtu = new_mtu;
1024 } else {
1025 if ((new_mtu > XAE_MTU) || (new_mtu < 64))
1026 return -EINVAL;
1027 ndev->mtu = new_mtu;
1028 }
1029
1030 return 0;
1031}
1032
1033#ifdef CONFIG_NET_POLL_CONTROLLER
1034/**
1035 * axienet_poll_controller - Axi Ethernet poll mechanism.
1036 * @ndev: Pointer to net_device structure
1037 *
1038 * This implements Rx/Tx ISR poll mechanisms. The interrupts are disabled prior
1039 * to polling the ISRs and are enabled back after the polling is done.
1040 */
1041static void axienet_poll_controller(struct net_device *ndev)
1042{
1043 struct axienet_local *lp = netdev_priv(ndev);
1044 disable_irq(lp->tx_irq);
1045 disable_irq(lp->rx_irq);
1046 axienet_rx_irq(lp->tx_irq, ndev);
1047 axienet_tx_irq(lp->rx_irq, ndev);
1048 enable_irq(lp->tx_irq);
1049 enable_irq(lp->rx_irq);
1050}
1051#endif
1052
1053static const struct net_device_ops axienet_netdev_ops = {
1054 .ndo_open = axienet_open,
1055 .ndo_stop = axienet_stop,
1056 .ndo_start_xmit = axienet_start_xmit,
1057 .ndo_change_mtu = axienet_change_mtu,
1058 .ndo_set_mac_address = netdev_set_mac_address,
1059 .ndo_validate_addr = eth_validate_addr,
1060 .ndo_set_rx_mode = axienet_set_multicast_list,
1061#ifdef CONFIG_NET_POLL_CONTROLLER
1062 .ndo_poll_controller = axienet_poll_controller,
1063#endif
1064};
1065
1066/**
1067 * axienet_ethtools_get_settings - Get Axi Ethernet settings related to PHY.
1068 * @ndev: Pointer to net_device structure
1069 * @ecmd: Pointer to ethtool_cmd structure
1070 *
1071 * This implements ethtool command for getting PHY settings. If PHY could
1072 * not be found, the function returns -ENODEV. This function calls the
1073 * relevant PHY ethtool API to get the PHY settings.
1074 * Issue "ethtool ethX" under linux prompt to execute this function.
1075 */
1076static int axienet_ethtools_get_settings(struct net_device *ndev,
1077 struct ethtool_cmd *ecmd)
1078{
1079 struct axienet_local *lp = netdev_priv(ndev);
1080 struct phy_device *phydev = lp->phy_dev;
1081 if (!phydev)
1082 return -ENODEV;
1083 return phy_ethtool_gset(phydev, ecmd);
1084}
1085
1086/**
1087 * axienet_ethtools_set_settings - Set PHY settings as passed in the argument.
1088 * @ndev: Pointer to net_device structure
1089 * @ecmd: Pointer to ethtool_cmd structure
1090 *
1091 * This implements ethtool command for setting various PHY settings. If PHY
1092 * could not be found, the function returns -ENODEV. This function calls the
1093 * relevant PHY ethtool API to set the PHY.
1094 * Issue e.g. "ethtool -s ethX speed 1000" under linux prompt to execute this
1095 * function.
1096 */
1097static int axienet_ethtools_set_settings(struct net_device *ndev,
1098 struct ethtool_cmd *ecmd)
1099{
1100 struct axienet_local *lp = netdev_priv(ndev);
1101 struct phy_device *phydev = lp->phy_dev;
1102 if (!phydev)
1103 return -ENODEV;
1104 return phy_ethtool_sset(phydev, ecmd);
1105}
1106
1107/**
1108 * axienet_ethtools_get_drvinfo - Get various Axi Ethernet driver information.
1109 * @ndev: Pointer to net_device structure
1110 * @ed: Pointer to ethtool_drvinfo structure
1111 *
1112 * This implements ethtool command for getting the driver information.
1113 * Issue "ethtool -i ethX" under linux prompt to execute this function.
1114 */
1115static void axienet_ethtools_get_drvinfo(struct net_device *ndev,
1116 struct ethtool_drvinfo *ed)
1117{
1118 strlcpy(ed->driver, DRIVER_NAME, sizeof(ed->driver));
1119 strlcpy(ed->version, DRIVER_VERSION, sizeof(ed->version));
1120 ed->regdump_len = sizeof(u32) * AXIENET_REGS_N;
1121}
1122
1123/**
1124 * axienet_ethtools_get_regs_len - Get the total regs length present in the
1125 * AxiEthernet core.
1126 * @ndev: Pointer to net_device structure
1127 *
1128 * This implements ethtool command for getting the total register length
1129 * information.
1130 */
1131static int axienet_ethtools_get_regs_len(struct net_device *ndev)
1132{
1133 return sizeof(u32) * AXIENET_REGS_N;
1134}
1135
1136/**
1137 * axienet_ethtools_get_regs - Dump the contents of all registers present
1138 * in AxiEthernet core.
1139 * @ndev: Pointer to net_device structure
1140 * @regs: Pointer to ethtool_regs structure
1141 * @ret: Void pointer used to return the contents of the registers.
1142 *
1143 * This implements ethtool command for getting the Axi Ethernet register dump.
1144 * Issue "ethtool -d ethX" to execute this function.
1145 */
1146static void axienet_ethtools_get_regs(struct net_device *ndev,
1147 struct ethtool_regs *regs, void *ret)
1148{
1149 u32 *data = (u32 *) ret;
1150 size_t len = sizeof(u32) * AXIENET_REGS_N;
1151 struct axienet_local *lp = netdev_priv(ndev);
1152
1153 regs->version = 0;
1154 regs->len = len;
1155
1156 memset(data, 0, len);
1157 data[0] = axienet_ior(lp, XAE_RAF_OFFSET);
1158 data[1] = axienet_ior(lp, XAE_TPF_OFFSET);
1159 data[2] = axienet_ior(lp, XAE_IFGP_OFFSET);
1160 data[3] = axienet_ior(lp, XAE_IS_OFFSET);
1161 data[4] = axienet_ior(lp, XAE_IP_OFFSET);
1162 data[5] = axienet_ior(lp, XAE_IE_OFFSET);
1163 data[6] = axienet_ior(lp, XAE_TTAG_OFFSET);
1164 data[7] = axienet_ior(lp, XAE_RTAG_OFFSET);
1165 data[8] = axienet_ior(lp, XAE_UAWL_OFFSET);
1166 data[9] = axienet_ior(lp, XAE_UAWU_OFFSET);
1167 data[10] = axienet_ior(lp, XAE_TPID0_OFFSET);
1168 data[11] = axienet_ior(lp, XAE_TPID1_OFFSET);
1169 data[12] = axienet_ior(lp, XAE_PPST_OFFSET);
1170 data[13] = axienet_ior(lp, XAE_RCW0_OFFSET);
1171 data[14] = axienet_ior(lp, XAE_RCW1_OFFSET);
1172 data[15] = axienet_ior(lp, XAE_TC_OFFSET);
1173 data[16] = axienet_ior(lp, XAE_FCC_OFFSET);
1174 data[17] = axienet_ior(lp, XAE_EMMC_OFFSET);
1175 data[18] = axienet_ior(lp, XAE_PHYC_OFFSET);
1176 data[19] = axienet_ior(lp, XAE_MDIO_MC_OFFSET);
1177 data[20] = axienet_ior(lp, XAE_MDIO_MCR_OFFSET);
1178 data[21] = axienet_ior(lp, XAE_MDIO_MWD_OFFSET);
1179 data[22] = axienet_ior(lp, XAE_MDIO_MRD_OFFSET);
1180 data[23] = axienet_ior(lp, XAE_MDIO_MIS_OFFSET);
1181 data[24] = axienet_ior(lp, XAE_MDIO_MIP_OFFSET);
1182 data[25] = axienet_ior(lp, XAE_MDIO_MIE_OFFSET);
1183 data[26] = axienet_ior(lp, XAE_MDIO_MIC_OFFSET);
1184 data[27] = axienet_ior(lp, XAE_UAW0_OFFSET);
1185 data[28] = axienet_ior(lp, XAE_UAW1_OFFSET);
1186 data[29] = axienet_ior(lp, XAE_FMI_OFFSET);
1187 data[30] = axienet_ior(lp, XAE_AF0_OFFSET);
1188 data[31] = axienet_ior(lp, XAE_AF1_OFFSET);
1189}
1190
1191/**
1192 * axienet_ethtools_get_pauseparam - Get the pause parameter setting for
1193 * Tx and Rx paths.
1194 * @ndev: Pointer to net_device structure
1195 * @epauseparm: Pointer to ethtool_pauseparam structure.
1196 *
1197 * This implements ethtool command for getting axi ethernet pause frame
1198 * setting. Issue "ethtool -a ethX" to execute this function.
1199 */
1200static void
1201axienet_ethtools_get_pauseparam(struct net_device *ndev,
1202 struct ethtool_pauseparam *epauseparm)
1203{
1204 u32 regval;
1205 struct axienet_local *lp = netdev_priv(ndev);
1206 epauseparm->autoneg = 0;
1207 regval = axienet_ior(lp, XAE_FCC_OFFSET);
1208 epauseparm->tx_pause = regval & XAE_FCC_FCTX_MASK;
1209 epauseparm->rx_pause = regval & XAE_FCC_FCRX_MASK;
1210}
1211
1212/**
1213 * axienet_ethtools_set_pauseparam - Set device pause parameter(flow control)
1214 * settings.
1215 * @ndev: Pointer to net_device structure
1216 * @epauseparam:Pointer to ethtool_pauseparam structure
1217 *
1218 * This implements ethtool command for enabling flow control on Rx and Tx
1219 * paths. Issue "ethtool -A ethX tx on|off" under linux prompt to execute this
1220 * function.
1221 */
1222static int
1223axienet_ethtools_set_pauseparam(struct net_device *ndev,
1224 struct ethtool_pauseparam *epauseparm)
1225{
1226 u32 regval = 0;
1227 struct axienet_local *lp = netdev_priv(ndev);
1228
1229 if (netif_running(ndev)) {
1230 printk(KERN_ERR "%s: Please stop netif before applying "
1231 "configruation\n", ndev->name);
1232 return -EFAULT;
1233 }
1234
1235 regval = axienet_ior(lp, XAE_FCC_OFFSET);
1236 if (epauseparm->tx_pause)
1237 regval |= XAE_FCC_FCTX_MASK;
1238 else
1239 regval &= ~XAE_FCC_FCTX_MASK;
1240 if (epauseparm->rx_pause)
1241 regval |= XAE_FCC_FCRX_MASK;
1242 else
1243 regval &= ~XAE_FCC_FCRX_MASK;
1244 axienet_iow(lp, XAE_FCC_OFFSET, regval);
1245
1246 return 0;
1247}
1248
1249/**
1250 * axienet_ethtools_get_coalesce - Get DMA interrupt coalescing count.
1251 * @ndev: Pointer to net_device structure
1252 * @ecoalesce: Pointer to ethtool_coalesce structure
1253 *
1254 * This implements ethtool command for getting the DMA interrupt coalescing
1255 * count on Tx and Rx paths. Issue "ethtool -c ethX" under linux prompt to
1256 * execute this function.
1257 */
1258static int axienet_ethtools_get_coalesce(struct net_device *ndev,
1259 struct ethtool_coalesce *ecoalesce)
1260{
1261 u32 regval = 0;
1262 struct axienet_local *lp = netdev_priv(ndev);
1263 regval = axienet_dma_in32(lp, XAXIDMA_RX_CR_OFFSET);
1264 ecoalesce->rx_max_coalesced_frames = (regval & XAXIDMA_COALESCE_MASK)
1265 >> XAXIDMA_COALESCE_SHIFT;
1266 regval = axienet_dma_in32(lp, XAXIDMA_TX_CR_OFFSET);
1267 ecoalesce->tx_max_coalesced_frames = (regval & XAXIDMA_COALESCE_MASK)
1268 >> XAXIDMA_COALESCE_SHIFT;
1269 return 0;
1270}
1271
1272/**
1273 * axienet_ethtools_set_coalesce - Set DMA interrupt coalescing count.
1274 * @ndev: Pointer to net_device structure
1275 * @ecoalesce: Pointer to ethtool_coalesce structure
1276 *
1277 * This implements ethtool command for setting the DMA interrupt coalescing
1278 * count on Tx and Rx paths. Issue "ethtool -C ethX rx-frames 5" under linux
1279 * prompt to execute this function.
1280 */
1281static int axienet_ethtools_set_coalesce(struct net_device *ndev,
1282 struct ethtool_coalesce *ecoalesce)
1283{
1284 struct axienet_local *lp = netdev_priv(ndev);
1285
1286 if (netif_running(ndev)) {
1287 printk(KERN_ERR "%s: Please stop netif before applying "
1288 "configruation\n", ndev->name);
1289 return -EFAULT;
1290 }
1291
1292 if ((ecoalesce->rx_coalesce_usecs) ||
1293 (ecoalesce->rx_coalesce_usecs_irq) ||
1294 (ecoalesce->rx_max_coalesced_frames_irq) ||
1295 (ecoalesce->tx_coalesce_usecs) ||
1296 (ecoalesce->tx_coalesce_usecs_irq) ||
1297 (ecoalesce->tx_max_coalesced_frames_irq) ||
1298 (ecoalesce->stats_block_coalesce_usecs) ||
1299 (ecoalesce->use_adaptive_rx_coalesce) ||
1300 (ecoalesce->use_adaptive_tx_coalesce) ||
1301 (ecoalesce->pkt_rate_low) ||
1302 (ecoalesce->rx_coalesce_usecs_low) ||
1303 (ecoalesce->rx_max_coalesced_frames_low) ||
1304 (ecoalesce->tx_coalesce_usecs_low) ||
1305 (ecoalesce->tx_max_coalesced_frames_low) ||
1306 (ecoalesce->pkt_rate_high) ||
1307 (ecoalesce->rx_coalesce_usecs_high) ||
1308 (ecoalesce->rx_max_coalesced_frames_high) ||
1309 (ecoalesce->tx_coalesce_usecs_high) ||
1310 (ecoalesce->tx_max_coalesced_frames_high) ||
1311 (ecoalesce->rate_sample_interval))
1312 return -EOPNOTSUPP;
1313 if (ecoalesce->rx_max_coalesced_frames)
1314 lp->coalesce_count_rx = ecoalesce->rx_max_coalesced_frames;
1315 if (ecoalesce->tx_max_coalesced_frames)
1316 lp->coalesce_count_tx = ecoalesce->tx_max_coalesced_frames;
1317
1318 return 0;
1319}
1320
1321static struct ethtool_ops axienet_ethtool_ops = {
1322 .get_settings = axienet_ethtools_get_settings,
1323 .set_settings = axienet_ethtools_set_settings,
1324 .get_drvinfo = axienet_ethtools_get_drvinfo,
1325 .get_regs_len = axienet_ethtools_get_regs_len,
1326 .get_regs = axienet_ethtools_get_regs,
1327 .get_link = ethtool_op_get_link,
1328 .get_pauseparam = axienet_ethtools_get_pauseparam,
1329 .set_pauseparam = axienet_ethtools_set_pauseparam,
1330 .get_coalesce = axienet_ethtools_get_coalesce,
1331 .set_coalesce = axienet_ethtools_set_coalesce,
1332};
1333
1334/**
1335 * axienet_dma_err_handler - Tasklet handler for Axi DMA Error
1336 * @data: Data passed
1337 *
1338 * Resets the Axi DMA and Axi Ethernet devices, and reconfigures the
1339 * Tx/Rx BDs.
1340 */
1341static void axienet_dma_err_handler(unsigned long data)
1342{
1343 u32 axienet_status;
1344 u32 cr, i;
1345 int mdio_mcreg;
1346 struct axienet_local *lp = (struct axienet_local *) data;
1347 struct net_device *ndev = lp->ndev;
1348 struct axidma_bd *cur_p;
1349
1350 axienet_setoptions(ndev, lp->options &
1351 ~(XAE_OPTION_TXEN | XAE_OPTION_RXEN));
1352 mdio_mcreg = axienet_ior(lp, XAE_MDIO_MC_OFFSET);
1353 axienet_mdio_wait_until_ready(lp);
1354 /* Disable the MDIO interface till Axi Ethernet Reset is completed.
1355 * When we do an Axi Ethernet reset, it resets the complete core
1356 * including the MDIO. So if MDIO is not disabled when the reset
1357 * process is started, MDIO will be broken afterwards. */
1358 axienet_iow(lp, XAE_MDIO_MC_OFFSET, (mdio_mcreg &
1359 ~XAE_MDIO_MC_MDIOEN_MASK));
1360
1361 __axienet_device_reset(lp, &ndev->dev, XAXIDMA_TX_CR_OFFSET);
1362 __axienet_device_reset(lp, &ndev->dev, XAXIDMA_RX_CR_OFFSET);
1363
1364 axienet_iow(lp, XAE_MDIO_MC_OFFSET, mdio_mcreg);
1365 axienet_mdio_wait_until_ready(lp);
1366
1367 for (i = 0; i < TX_BD_NUM; i++) {
1368 cur_p = &lp->tx_bd_v[i];
1369 if (cur_p->phys)
1370 dma_unmap_single(ndev->dev.parent, cur_p->phys,
1371 (cur_p->cntrl &
1372 XAXIDMA_BD_CTRL_LENGTH_MASK),
1373 DMA_TO_DEVICE);
1374 if (cur_p->app4)
1375 dev_kfree_skb_irq((struct sk_buff *) cur_p->app4);
1376 cur_p->phys = 0;
1377 cur_p->cntrl = 0;
1378 cur_p->status = 0;
1379 cur_p->app0 = 0;
1380 cur_p->app1 = 0;
1381 cur_p->app2 = 0;
1382 cur_p->app3 = 0;
1383 cur_p->app4 = 0;
1384 cur_p->sw_id_offset = 0;
1385 }
1386
1387 for (i = 0; i < RX_BD_NUM; i++) {
1388 cur_p = &lp->rx_bd_v[i];
1389 cur_p->status = 0;
1390 cur_p->app0 = 0;
1391 cur_p->app1 = 0;
1392 cur_p->app2 = 0;
1393 cur_p->app3 = 0;
1394 cur_p->app4 = 0;
1395 }
1396
1397 lp->tx_bd_ci = 0;
1398 lp->tx_bd_tail = 0;
1399 lp->rx_bd_ci = 0;
1400
1401 /* Start updating the Rx channel control register */
1402 cr = axienet_dma_in32(lp, XAXIDMA_RX_CR_OFFSET);
1403 /* Update the interrupt coalesce count */
1404 cr = ((cr & ~XAXIDMA_COALESCE_MASK) |
1405 (XAXIDMA_DFT_RX_THRESHOLD << XAXIDMA_COALESCE_SHIFT));
1406 /* Update the delay timer count */
1407 cr = ((cr & ~XAXIDMA_DELAY_MASK) |
1408 (XAXIDMA_DFT_RX_WAITBOUND << XAXIDMA_DELAY_SHIFT));
1409 /* Enable coalesce, delay timer and error interrupts */
1410 cr |= XAXIDMA_IRQ_ALL_MASK;
1411 /* Finally write to the Rx channel control register */
1412 axienet_dma_out32(lp, XAXIDMA_RX_CR_OFFSET, cr);
1413
1414 /* Start updating the Tx channel control register */
1415 cr = axienet_dma_in32(lp, XAXIDMA_TX_CR_OFFSET);
1416 /* Update the interrupt coalesce count */
1417 cr = (((cr & ~XAXIDMA_COALESCE_MASK)) |
1418 (XAXIDMA_DFT_TX_THRESHOLD << XAXIDMA_COALESCE_SHIFT));
1419 /* Update the delay timer count */
1420 cr = (((cr & ~XAXIDMA_DELAY_MASK)) |
1421 (XAXIDMA_DFT_TX_WAITBOUND << XAXIDMA_DELAY_SHIFT));
1422 /* Enable coalesce, delay timer and error interrupts */
1423 cr |= XAXIDMA_IRQ_ALL_MASK;
1424 /* Finally write to the Tx channel control register */
1425 axienet_dma_out32(lp, XAXIDMA_TX_CR_OFFSET, cr);
1426
1427 /* Populate the tail pointer and bring the Rx Axi DMA engine out of
1428 * halted state. This will make the Rx side ready for reception.*/
1429 axienet_dma_out32(lp, XAXIDMA_RX_CDESC_OFFSET, lp->rx_bd_p);
1430 cr = axienet_dma_in32(lp, XAXIDMA_RX_CR_OFFSET);
1431 axienet_dma_out32(lp, XAXIDMA_RX_CR_OFFSET,
1432 cr | XAXIDMA_CR_RUNSTOP_MASK);
1433 axienet_dma_out32(lp, XAXIDMA_RX_TDESC_OFFSET, lp->rx_bd_p +
1434 (sizeof(*lp->rx_bd_v) * (RX_BD_NUM - 1)));
1435
1436 /* Write to the RS (Run-stop) bit in the Tx channel control register.
1437 * Tx channel is now ready to run. But only after we write to the
1438 * tail pointer register that the Tx channel will start transmitting */
1439 axienet_dma_out32(lp, XAXIDMA_TX_CDESC_OFFSET, lp->tx_bd_p);
1440 cr = axienet_dma_in32(lp, XAXIDMA_TX_CR_OFFSET);
1441 axienet_dma_out32(lp, XAXIDMA_TX_CR_OFFSET,
1442 cr | XAXIDMA_CR_RUNSTOP_MASK);
1443
1444 axienet_status = axienet_ior(lp, XAE_RCW1_OFFSET);
1445 axienet_status &= ~XAE_RCW1_RX_MASK;
1446 axienet_iow(lp, XAE_RCW1_OFFSET, axienet_status);
1447
1448 axienet_status = axienet_ior(lp, XAE_IP_OFFSET);
1449 if (axienet_status & XAE_INT_RXRJECT_MASK)
1450 axienet_iow(lp, XAE_IS_OFFSET, XAE_INT_RXRJECT_MASK);
1451 axienet_iow(lp, XAE_FCC_OFFSET, XAE_FCC_FCRX_MASK);
1452
1453 /* Sync default options with HW but leave receiver and
1454 * transmitter disabled.*/
1455 axienet_setoptions(ndev, lp->options &
1456 ~(XAE_OPTION_TXEN | XAE_OPTION_RXEN));
1457 axienet_set_mac_address(ndev, NULL);
1458 axienet_set_multicast_list(ndev);
1459 axienet_setoptions(ndev, lp->options);
1460}
1461
1462/**
1463 * axienet_of_probe - Axi Ethernet probe function.
1464 * @op: Pointer to platform device structure.
1465 * @match: Pointer to device id structure
1466 *
1467 * returns: 0, on success
1468 * Non-zero error value on failure.
1469 *
1470 * This is the probe routine for Axi Ethernet driver. This is called before
1471 * any other driver routines are invoked. It allocates and sets up the Ethernet
1472 * device. Parses through device tree and populates fields of
1473 * axienet_local. It registers the Ethernet device.
1474 */
1475static int axienet_of_probe(struct platform_device *op)
1476{
1477 __be32 *p;
1478 int size, ret = 0;
1479 struct device_node *np;
1480 struct axienet_local *lp;
1481 struct net_device *ndev;
1482 const void *addr;
1483
1484 ndev = alloc_etherdev(sizeof(*lp));
1485 if (!ndev)
1486 return -ENOMEM;
1487
1488 ether_setup(ndev);
1489 platform_set_drvdata(op, ndev);
1490
1491 SET_NETDEV_DEV(ndev, &op->dev);
1492 ndev->flags &= ~IFF_MULTICAST; /* clear multicast */
1493 ndev->features = NETIF_F_SG;
1494 ndev->netdev_ops = &axienet_netdev_ops;
1495 ndev->ethtool_ops = &axienet_ethtool_ops;
1496
1497 lp = netdev_priv(ndev);
1498 lp->ndev = ndev;
1499 lp->dev = &op->dev;
1500 lp->options = XAE_OPTION_DEFAULTS;
1501 /* Map device registers */
1502 lp->regs = of_iomap(op->dev.of_node, 0);
1503 if (!lp->regs) {
1504 dev_err(&op->dev, "could not map Axi Ethernet regs.\n");
1505 goto nodev;
1506 }
1507 /* Setup checksum offload, but default to off if not specified */
1508 lp->features = 0;
1509
1510 p = (__be32 *) of_get_property(op->dev.of_node, "xlnx,txcsum", NULL);
1511 if (p) {
1512 switch (be32_to_cpup(p)) {
1513 case 1:
1514 lp->csum_offload_on_tx_path =
1515 XAE_FEATURE_PARTIAL_TX_CSUM;
1516 lp->features |= XAE_FEATURE_PARTIAL_TX_CSUM;
1517 /* Can checksum TCP/UDP over IPv4. */
1518 ndev->features |= NETIF_F_IP_CSUM;
1519 break;
1520 case 2:
1521 lp->csum_offload_on_tx_path =
1522 XAE_FEATURE_FULL_TX_CSUM;
1523 lp->features |= XAE_FEATURE_FULL_TX_CSUM;
1524 /* Can checksum TCP/UDP over IPv4. */
1525 ndev->features |= NETIF_F_IP_CSUM;
1526 break;
1527 default:
1528 lp->csum_offload_on_tx_path = XAE_NO_CSUM_OFFLOAD;
1529 }
1530 }
1531 p = (__be32 *) of_get_property(op->dev.of_node, "xlnx,rxcsum", NULL);
1532 if (p) {
1533 switch (be32_to_cpup(p)) {
1534 case 1:
1535 lp->csum_offload_on_rx_path =
1536 XAE_FEATURE_PARTIAL_RX_CSUM;
1537 lp->features |= XAE_FEATURE_PARTIAL_RX_CSUM;
1538 break;
1539 case 2:
1540 lp->csum_offload_on_rx_path =
1541 XAE_FEATURE_FULL_RX_CSUM;
1542 lp->features |= XAE_FEATURE_FULL_RX_CSUM;
1543 break;
1544 default:
1545 lp->csum_offload_on_rx_path = XAE_NO_CSUM_OFFLOAD;
1546 }
1547 }
1548 /* For supporting jumbo frames, the Axi Ethernet hardware must have
1549 * a larger Rx/Tx Memory. Typically, the size must be more than or
1550 * equal to 16384 bytes, so that we can enable jumbo option and start
1551 * supporting jumbo frames. Here we check for memory allocated for
1552 * Rx/Tx in the hardware from the device-tree and accordingly set
1553 * flags. */
1554 p = (__be32 *) of_get_property(op->dev.of_node, "xlnx,rxmem", NULL);
1555 if (p) {
1556 if ((be32_to_cpup(p)) >= 0x4000)
1557 lp->jumbo_support = 1;
1558 }
1559 p = (__be32 *) of_get_property(op->dev.of_node, "xlnx,temac-type",
1560 NULL);
1561 if (p)
1562 lp->temac_type = be32_to_cpup(p);
1563 p = (__be32 *) of_get_property(op->dev.of_node, "xlnx,phy-type", NULL);
1564 if (p)
1565 lp->phy_type = be32_to_cpup(p);
1566
1567 /* Find the DMA node, map the DMA registers, and decode the DMA IRQs */
1568 np = of_parse_phandle(op->dev.of_node, "axistream-connected", 0);
1569 if (!np) {
1570 dev_err(&op->dev, "could not find DMA node\n");
1571 goto err_iounmap;
1572 }
1573 lp->dma_regs = of_iomap(np, 0);
1574 if (lp->dma_regs) {
1575 dev_dbg(&op->dev, "MEM base: %p\n", lp->dma_regs);
1576 } else {
1577 dev_err(&op->dev, "unable to map DMA registers\n");
1578 of_node_put(np);
1579 }
1580 lp->rx_irq = irq_of_parse_and_map(np, 1);
1581 lp->tx_irq = irq_of_parse_and_map(np, 0);
1582 of_node_put(np);
1583 if ((lp->rx_irq <= 0) || (lp->tx_irq <= 0)) {
1584 dev_err(&op->dev, "could not determine irqs\n");
1585 ret = -ENOMEM;
1586 goto err_iounmap_2;
1587 }
1588
1589 /* Retrieve the MAC address */
1590 addr = of_get_property(op->dev.of_node, "local-mac-address", &size);
1591 if ((!addr) || (size != 6)) {
1592 dev_err(&op->dev, "could not find MAC address\n");
1593 ret = -ENODEV;
1594 goto err_iounmap_2;
1595 }
1596 axienet_set_mac_address(ndev, (void *) addr);
1597
1598 lp->coalesce_count_rx = XAXIDMA_DFT_RX_THRESHOLD;
1599 lp->coalesce_count_tx = XAXIDMA_DFT_TX_THRESHOLD;
1600
1601 lp->phy_node = of_parse_phandle(op->dev.of_node, "phy-handle", 0);
1602 ret = axienet_mdio_setup(lp, op->dev.of_node);
1603 if (ret)
1604 dev_warn(&op->dev, "error registering MDIO bus\n");
1605
1606 ret = register_netdev(lp->ndev);
1607 if (ret) {
1608 dev_err(lp->dev, "register_netdev() error (%i)\n", ret);
1609 goto err_iounmap_2;
1610 }
1611
1612 return 0;
1613
1614err_iounmap_2:
1615 if (lp->dma_regs)
1616 iounmap(lp->dma_regs);
1617err_iounmap:
1618 iounmap(lp->regs);
1619nodev:
1620 free_netdev(ndev);
1621 ndev = NULL;
1622 return ret;
1623}
1624
1625static int axienet_of_remove(struct platform_device *op)
1626{
1627 struct net_device *ndev = platform_get_drvdata(op);
1628 struct axienet_local *lp = netdev_priv(ndev);
1629
1630 axienet_mdio_teardown(lp);
1631 unregister_netdev(ndev);
1632
1633 if (lp->phy_node)
1634 of_node_put(lp->phy_node);
1635 lp->phy_node = NULL;
1636
1637 iounmap(lp->regs);
1638 if (lp->dma_regs)
1639 iounmap(lp->dma_regs);
1640 free_netdev(ndev);
1641
1642 return 0;
1643}
1644
1645static struct platform_driver axienet_of_driver = {
1646 .probe = axienet_of_probe,
1647 .remove = axienet_of_remove,
1648 .driver = {
1649 .owner = THIS_MODULE,
1650 .name = "xilinx_axienet",
1651 .of_match_table = axienet_of_match,
1652 },
1653};
1654
1655module_platform_driver(axienet_of_driver);
1656
1657MODULE_DESCRIPTION("Xilinx Axi Ethernet driver");
1658MODULE_AUTHOR("Xilinx");
1659MODULE_LICENSE("GPL");