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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 axienet_set_mac_address(ndev, addr->sa_data);
419 return 0;
420}
421
422/**
423 * axienet_set_multicast_list - Prepare the multicast table
424 * @ndev: Pointer to the net_device structure
425 *
426 * This function is called to initialize the multicast table during
427 * initialization. The Axi Ethernet basic multicast support has a four-entry
428 * multicast table which is initialized here. Additionally this function
429 * goes into the net_device_ops structure entry ndo_set_multicast_list. This
430 * means whenever the multicast table entries need to be updated this
431 * function gets called.
432 */
433static void axienet_set_multicast_list(struct net_device *ndev)
434{
435 int i;
436 u32 reg, af0reg, af1reg;
437 struct axienet_local *lp = netdev_priv(ndev);
438
439 if (ndev->flags & (IFF_ALLMULTI | IFF_PROMISC) ||
440 netdev_mc_count(ndev) > XAE_MULTICAST_CAM_TABLE_NUM) {
441 /* We must make the kernel realize we had to move into
442 * promiscuous mode. If it was a promiscuous mode request
443 * the flag is already set. If not we set it.
444 */
445 ndev->flags |= IFF_PROMISC;
446 reg = axienet_ior(lp, XAE_FMI_OFFSET);
447 reg |= XAE_FMI_PM_MASK;
448 axienet_iow(lp, XAE_FMI_OFFSET, reg);
449 dev_info(&ndev->dev, "Promiscuous mode enabled.\n");
450 } else if (!netdev_mc_empty(ndev)) {
451 struct netdev_hw_addr *ha;
452
453 i = 0;
454 netdev_for_each_mc_addr(ha, ndev) {
455 if (i >= XAE_MULTICAST_CAM_TABLE_NUM)
456 break;
457
458 af0reg = (ha->addr[0]);
459 af0reg |= (ha->addr[1] << 8);
460 af0reg |= (ha->addr[2] << 16);
461 af0reg |= (ha->addr[3] << 24);
462
463 af1reg = (ha->addr[4]);
464 af1reg |= (ha->addr[5] << 8);
465
466 reg = axienet_ior(lp, XAE_FMI_OFFSET) & 0xFFFFFF00;
467 reg |= i;
468
469 axienet_iow(lp, XAE_FMI_OFFSET, reg);
470 axienet_iow(lp, XAE_AF0_OFFSET, af0reg);
471 axienet_iow(lp, XAE_AF1_OFFSET, af1reg);
472 i++;
473 }
474 } else {
475 reg = axienet_ior(lp, XAE_FMI_OFFSET);
476 reg &= ~XAE_FMI_PM_MASK;
477
478 axienet_iow(lp, XAE_FMI_OFFSET, reg);
479
480 for (i = 0; i < XAE_MULTICAST_CAM_TABLE_NUM; i++) {
481 reg = axienet_ior(lp, XAE_FMI_OFFSET) & 0xFFFFFF00;
482 reg |= i;
483
484 axienet_iow(lp, XAE_FMI_OFFSET, reg);
485 axienet_iow(lp, XAE_AF0_OFFSET, 0);
486 axienet_iow(lp, XAE_AF1_OFFSET, 0);
487 }
488
489 dev_info(&ndev->dev, "Promiscuous mode disabled.\n");
490 }
491}
492
493/**
494 * axienet_setoptions - Set an Axi Ethernet option
495 * @ndev: Pointer to the net_device structure
496 * @options: Option to be enabled/disabled
497 *
498 * The Axi Ethernet core has multiple features which can be selectively turned
499 * on or off. The typical options could be jumbo frame option, basic VLAN
500 * option, promiscuous mode option etc. This function is used to set or clear
501 * these options in the Axi Ethernet hardware. This is done through
502 * axienet_option structure .
503 */
504static void axienet_setoptions(struct net_device *ndev, u32 options)
505{
506 int reg;
507 struct axienet_local *lp = netdev_priv(ndev);
508 struct axienet_option *tp = &axienet_options[0];
509
510 while (tp->opt) {
511 reg = ((axienet_ior(lp, tp->reg)) & ~(tp->m_or));
512 if (options & tp->opt)
513 reg |= tp->m_or;
514 axienet_iow(lp, tp->reg, reg);
515 tp++;
516 }
517
518 lp->options |= options;
519}
520
521static int __axienet_device_reset(struct axienet_local *lp)
522{
523 u32 value;
524 int ret;
525
526 /* Reset Axi DMA. This would reset Axi Ethernet core as well. The reset
527 * process of Axi DMA takes a while to complete as all pending
528 * commands/transfers will be flushed or completed during this
529 * reset process.
530 * Note that even though both TX and RX have their own reset register,
531 * they both reset the entire DMA core, so only one needs to be used.
532 */
533 axienet_dma_out32(lp, XAXIDMA_TX_CR_OFFSET, XAXIDMA_CR_RESET_MASK);
534 ret = read_poll_timeout(axienet_dma_in32, value,
535 !(value & XAXIDMA_CR_RESET_MASK),
536 DELAY_OF_ONE_MILLISEC, 50000, false, lp,
537 XAXIDMA_TX_CR_OFFSET);
538 if (ret) {
539 dev_err(lp->dev, "%s: DMA reset timeout!\n", __func__);
540 return ret;
541 }
542
543 /* Wait for PhyRstCmplt bit to be set, indicating the PHY reset has finished */
544 ret = read_poll_timeout(axienet_ior, value,
545 value & XAE_INT_PHYRSTCMPLT_MASK,
546 DELAY_OF_ONE_MILLISEC, 50000, false, lp,
547 XAE_IS_OFFSET);
548 if (ret) {
549 dev_err(lp->dev, "%s: timeout waiting for PhyRstCmplt\n", __func__);
550 return ret;
551 }
552
553 return 0;
554}
555
556/**
557 * axienet_dma_stop - Stop DMA operation
558 * @lp: Pointer to the axienet_local structure
559 */
560static void axienet_dma_stop(struct axienet_local *lp)
561{
562 int count;
563 u32 cr, sr;
564
565 cr = axienet_dma_in32(lp, XAXIDMA_RX_CR_OFFSET);
566 cr &= ~(XAXIDMA_CR_RUNSTOP_MASK | XAXIDMA_IRQ_ALL_MASK);
567 axienet_dma_out32(lp, XAXIDMA_RX_CR_OFFSET, cr);
568 synchronize_irq(lp->rx_irq);
569
570 cr = axienet_dma_in32(lp, XAXIDMA_TX_CR_OFFSET);
571 cr &= ~(XAXIDMA_CR_RUNSTOP_MASK | XAXIDMA_IRQ_ALL_MASK);
572 axienet_dma_out32(lp, XAXIDMA_TX_CR_OFFSET, cr);
573 synchronize_irq(lp->tx_irq);
574
575 /* Give DMAs a chance to halt gracefully */
576 sr = axienet_dma_in32(lp, XAXIDMA_RX_SR_OFFSET);
577 for (count = 0; !(sr & XAXIDMA_SR_HALT_MASK) && count < 5; ++count) {
578 msleep(20);
579 sr = axienet_dma_in32(lp, XAXIDMA_RX_SR_OFFSET);
580 }
581
582 sr = axienet_dma_in32(lp, XAXIDMA_TX_SR_OFFSET);
583 for (count = 0; !(sr & XAXIDMA_SR_HALT_MASK) && count < 5; ++count) {
584 msleep(20);
585 sr = axienet_dma_in32(lp, XAXIDMA_TX_SR_OFFSET);
586 }
587
588 /* Do a reset to ensure DMA is really stopped */
589 axienet_lock_mii(lp);
590 __axienet_device_reset(lp);
591 axienet_unlock_mii(lp);
592}
593
594/**
595 * axienet_device_reset - Reset and initialize the Axi Ethernet hardware.
596 * @ndev: Pointer to the net_device structure
597 *
598 * This function is called to reset and initialize the Axi Ethernet core. This
599 * is typically called during initialization. It does a reset of the Axi DMA
600 * Rx/Tx channels and initializes the Axi DMA BDs. Since Axi DMA reset lines
601 * are connected to Axi Ethernet reset lines, this in turn resets the Axi
602 * Ethernet core. No separate hardware reset is done for the Axi Ethernet
603 * core.
604 * Returns 0 on success or a negative error number otherwise.
605 */
606static int axienet_device_reset(struct net_device *ndev)
607{
608 u32 axienet_status;
609 struct axienet_local *lp = netdev_priv(ndev);
610 int ret;
611
612 lp->max_frm_size = XAE_MAX_VLAN_FRAME_SIZE;
613 lp->options |= XAE_OPTION_VLAN;
614 lp->options &= (~XAE_OPTION_JUMBO);
615
616 if ((ndev->mtu > XAE_MTU) &&
617 (ndev->mtu <= XAE_JUMBO_MTU)) {
618 lp->max_frm_size = ndev->mtu + VLAN_ETH_HLEN +
619 XAE_TRL_SIZE;
620
621 if (lp->max_frm_size <= lp->rxmem)
622 lp->options |= XAE_OPTION_JUMBO;
623 }
624
625 if (!lp->use_dmaengine) {
626 ret = __axienet_device_reset(lp);
627 if (ret)
628 return ret;
629
630 ret = axienet_dma_bd_init(ndev);
631 if (ret) {
632 netdev_err(ndev, "%s: descriptor allocation failed\n",
633 __func__);
634 return ret;
635 }
636 }
637
638 axienet_status = axienet_ior(lp, XAE_RCW1_OFFSET);
639 axienet_status &= ~XAE_RCW1_RX_MASK;
640 axienet_iow(lp, XAE_RCW1_OFFSET, axienet_status);
641
642 axienet_status = axienet_ior(lp, XAE_IP_OFFSET);
643 if (axienet_status & XAE_INT_RXRJECT_MASK)
644 axienet_iow(lp, XAE_IS_OFFSET, XAE_INT_RXRJECT_MASK);
645 axienet_iow(lp, XAE_IE_OFFSET, lp->eth_irq > 0 ?
646 XAE_INT_RECV_ERROR_MASK : 0);
647
648 axienet_iow(lp, XAE_FCC_OFFSET, XAE_FCC_FCRX_MASK);
649
650 /* Sync default options with HW but leave receiver and
651 * transmitter disabled.
652 */
653 axienet_setoptions(ndev, lp->options &
654 ~(XAE_OPTION_TXEN | XAE_OPTION_RXEN));
655 axienet_set_mac_address(ndev, NULL);
656 axienet_set_multicast_list(ndev);
657 axienet_setoptions(ndev, lp->options);
658
659 netif_trans_update(ndev);
660
661 return 0;
662}
663
664/**
665 * axienet_free_tx_chain - Clean up a series of linked TX descriptors.
666 * @lp: Pointer to the axienet_local structure
667 * @first_bd: Index of first descriptor to clean up
668 * @nr_bds: Max number of descriptors to clean up
669 * @force: Whether to clean descriptors even if not complete
670 * @sizep: Pointer to a u32 filled with the total sum of all bytes
671 * in all cleaned-up descriptors. Ignored if NULL.
672 * @budget: NAPI budget (use 0 when not called from NAPI poll)
673 *
674 * Would either be called after a successful transmit operation, or after
675 * there was an error when setting up the chain.
676 * Returns the number of descriptors handled.
677 */
678static int axienet_free_tx_chain(struct axienet_local *lp, u32 first_bd,
679 int nr_bds, bool force, u32 *sizep, int budget)
680{
681 struct axidma_bd *cur_p;
682 unsigned int status;
683 dma_addr_t phys;
684 int i;
685
686 for (i = 0; i < nr_bds; i++) {
687 cur_p = &lp->tx_bd_v[(first_bd + i) % lp->tx_bd_num];
688 status = cur_p->status;
689
690 /* If force is not specified, clean up only descriptors
691 * that have been completed by the MAC.
692 */
693 if (!force && !(status & XAXIDMA_BD_STS_COMPLETE_MASK))
694 break;
695
696 /* Ensure we see complete descriptor update */
697 dma_rmb();
698 phys = desc_get_phys_addr(lp, cur_p);
699 dma_unmap_single(lp->dev, phys,
700 (cur_p->cntrl & XAXIDMA_BD_CTRL_LENGTH_MASK),
701 DMA_TO_DEVICE);
702
703 if (cur_p->skb && (status & XAXIDMA_BD_STS_COMPLETE_MASK))
704 napi_consume_skb(cur_p->skb, budget);
705
706 cur_p->app0 = 0;
707 cur_p->app1 = 0;
708 cur_p->app2 = 0;
709 cur_p->app4 = 0;
710 cur_p->skb = NULL;
711 /* ensure our transmit path and device don't prematurely see status cleared */
712 wmb();
713 cur_p->cntrl = 0;
714 cur_p->status = 0;
715
716 if (sizep)
717 *sizep += status & XAXIDMA_BD_STS_ACTUAL_LEN_MASK;
718 }
719
720 return i;
721}
722
723/**
724 * axienet_check_tx_bd_space - Checks if a BD/group of BDs are currently busy
725 * @lp: Pointer to the axienet_local structure
726 * @num_frag: The number of BDs to check for
727 *
728 * Return: 0, on success
729 * NETDEV_TX_BUSY, if any of the descriptors are not free
730 *
731 * This function is invoked before BDs are allocated and transmission starts.
732 * This function returns 0 if a BD or group of BDs can be allocated for
733 * transmission. If the BD or any of the BDs are not free the function
734 * returns a busy status.
735 */
736static inline int axienet_check_tx_bd_space(struct axienet_local *lp,
737 int num_frag)
738{
739 struct axidma_bd *cur_p;
740
741 /* Ensure we see all descriptor updates from device or TX polling */
742 rmb();
743 cur_p = &lp->tx_bd_v[(READ_ONCE(lp->tx_bd_tail) + num_frag) %
744 lp->tx_bd_num];
745 if (cur_p->cntrl)
746 return NETDEV_TX_BUSY;
747 return 0;
748}
749
750/**
751 * axienet_dma_tx_cb - DMA engine callback for TX channel.
752 * @data: Pointer to the axienet_local structure.
753 * @result: error reporting through dmaengine_result.
754 * This function is called by dmaengine driver for TX channel to notify
755 * that the transmit is done.
756 */
757static void axienet_dma_tx_cb(void *data, const struct dmaengine_result *result)
758{
759 struct skbuf_dma_descriptor *skbuf_dma;
760 struct axienet_local *lp = data;
761 struct netdev_queue *txq;
762 int len;
763
764 skbuf_dma = axienet_get_tx_desc(lp, lp->tx_ring_tail++);
765 len = skbuf_dma->skb->len;
766 txq = skb_get_tx_queue(lp->ndev, skbuf_dma->skb);
767 u64_stats_update_begin(&lp->tx_stat_sync);
768 u64_stats_add(&lp->tx_bytes, len);
769 u64_stats_add(&lp->tx_packets, 1);
770 u64_stats_update_end(&lp->tx_stat_sync);
771 dma_unmap_sg(lp->dev, skbuf_dma->sgl, skbuf_dma->sg_len, DMA_TO_DEVICE);
772 dev_consume_skb_any(skbuf_dma->skb);
773 netif_txq_completed_wake(txq, 1, len,
774 CIRC_SPACE(lp->tx_ring_head, lp->tx_ring_tail, TX_BD_NUM_MAX),
775 2 * MAX_SKB_FRAGS);
776}
777
778/**
779 * axienet_start_xmit_dmaengine - Starts the transmission.
780 * @skb: sk_buff pointer that contains data to be Txed.
781 * @ndev: Pointer to net_device structure.
782 *
783 * Return: NETDEV_TX_OK on success or any non space errors.
784 * NETDEV_TX_BUSY when free element in TX skb ring buffer
785 * is not available.
786 *
787 * This function is invoked to initiate transmission. The
788 * function sets the skbs, register dma callback API and submit
789 * the dma transaction.
790 * Additionally if checksum offloading is supported,
791 * it populates AXI Stream Control fields with appropriate values.
792 */
793static netdev_tx_t
794axienet_start_xmit_dmaengine(struct sk_buff *skb, struct net_device *ndev)
795{
796 struct dma_async_tx_descriptor *dma_tx_desc = NULL;
797 struct axienet_local *lp = netdev_priv(ndev);
798 u32 app_metadata[DMA_NUM_APP_WORDS] = {0};
799 struct skbuf_dma_descriptor *skbuf_dma;
800 struct dma_device *dma_dev;
801 struct netdev_queue *txq;
802 u32 csum_start_off;
803 u32 csum_index_off;
804 int sg_len;
805 int ret;
806
807 dma_dev = lp->tx_chan->device;
808 sg_len = skb_shinfo(skb)->nr_frags + 1;
809 if (CIRC_SPACE(lp->tx_ring_head, lp->tx_ring_tail, TX_BD_NUM_MAX) <= sg_len) {
810 netif_stop_queue(ndev);
811 if (net_ratelimit())
812 netdev_warn(ndev, "TX ring unexpectedly full\n");
813 return NETDEV_TX_BUSY;
814 }
815
816 skbuf_dma = axienet_get_tx_desc(lp, lp->tx_ring_head);
817 if (!skbuf_dma)
818 goto xmit_error_drop_skb;
819
820 lp->tx_ring_head++;
821 sg_init_table(skbuf_dma->sgl, sg_len);
822 ret = skb_to_sgvec(skb, skbuf_dma->sgl, 0, skb->len);
823 if (ret < 0)
824 goto xmit_error_drop_skb;
825
826 ret = dma_map_sg(lp->dev, skbuf_dma->sgl, sg_len, DMA_TO_DEVICE);
827 if (!ret)
828 goto xmit_error_drop_skb;
829
830 /* Fill up app fields for checksum */
831 if (skb->ip_summed == CHECKSUM_PARTIAL) {
832 if (lp->features & XAE_FEATURE_FULL_TX_CSUM) {
833 /* Tx Full Checksum Offload Enabled */
834 app_metadata[0] |= 2;
835 } else if (lp->features & XAE_FEATURE_PARTIAL_TX_CSUM) {
836 csum_start_off = skb_transport_offset(skb);
837 csum_index_off = csum_start_off + skb->csum_offset;
838 /* Tx Partial Checksum Offload Enabled */
839 app_metadata[0] |= 1;
840 app_metadata[1] = (csum_start_off << 16) | csum_index_off;
841 }
842 } else if (skb->ip_summed == CHECKSUM_UNNECESSARY) {
843 app_metadata[0] |= 2; /* Tx Full Checksum Offload Enabled */
844 }
845
846 dma_tx_desc = dma_dev->device_prep_slave_sg(lp->tx_chan, skbuf_dma->sgl,
847 sg_len, DMA_MEM_TO_DEV,
848 DMA_PREP_INTERRUPT, (void *)app_metadata);
849 if (!dma_tx_desc)
850 goto xmit_error_unmap_sg;
851
852 skbuf_dma->skb = skb;
853 skbuf_dma->sg_len = sg_len;
854 dma_tx_desc->callback_param = lp;
855 dma_tx_desc->callback_result = axienet_dma_tx_cb;
856 dmaengine_submit(dma_tx_desc);
857 dma_async_issue_pending(lp->tx_chan);
858 txq = skb_get_tx_queue(lp->ndev, skb);
859 netdev_tx_sent_queue(txq, skb->len);
860 netif_txq_maybe_stop(txq, CIRC_SPACE(lp->tx_ring_head, lp->tx_ring_tail, TX_BD_NUM_MAX),
861 MAX_SKB_FRAGS + 1, 2 * MAX_SKB_FRAGS);
862
863 return NETDEV_TX_OK;
864
865xmit_error_unmap_sg:
866 dma_unmap_sg(lp->dev, skbuf_dma->sgl, sg_len, DMA_TO_DEVICE);
867xmit_error_drop_skb:
868 dev_kfree_skb_any(skb);
869 return NETDEV_TX_OK;
870}
871
872/**
873 * axienet_tx_poll - Invoked once a transmit is completed by the
874 * Axi DMA Tx channel.
875 * @napi: Pointer to NAPI structure.
876 * @budget: Max number of TX packets to process.
877 *
878 * Return: Number of TX packets processed.
879 *
880 * This function is invoked from the NAPI processing to notify the completion
881 * of transmit operation. It clears fields in the corresponding Tx BDs and
882 * unmaps the corresponding buffer so that CPU can regain ownership of the
883 * buffer. It finally invokes "netif_wake_queue" to restart transmission if
884 * required.
885 */
886static int axienet_tx_poll(struct napi_struct *napi, int budget)
887{
888 struct axienet_local *lp = container_of(napi, struct axienet_local, napi_tx);
889 struct net_device *ndev = lp->ndev;
890 u32 size = 0;
891 int packets;
892
893 packets = axienet_free_tx_chain(lp, lp->tx_bd_ci, budget, false, &size, budget);
894
895 if (packets) {
896 lp->tx_bd_ci += packets;
897 if (lp->tx_bd_ci >= lp->tx_bd_num)
898 lp->tx_bd_ci %= lp->tx_bd_num;
899
900 u64_stats_update_begin(&lp->tx_stat_sync);
901 u64_stats_add(&lp->tx_packets, packets);
902 u64_stats_add(&lp->tx_bytes, size);
903 u64_stats_update_end(&lp->tx_stat_sync);
904
905 /* Matches barrier in axienet_start_xmit */
906 smp_mb();
907
908 if (!axienet_check_tx_bd_space(lp, MAX_SKB_FRAGS + 1))
909 netif_wake_queue(ndev);
910 }
911
912 if (packets < budget && napi_complete_done(napi, packets)) {
913 /* Re-enable TX completion interrupts. This should
914 * cause an immediate interrupt if any TX packets are
915 * already pending.
916 */
917 axienet_dma_out32(lp, XAXIDMA_TX_CR_OFFSET, lp->tx_dma_cr);
918 }
919 return packets;
920}
921
922/**
923 * axienet_start_xmit - Starts the transmission.
924 * @skb: sk_buff pointer that contains data to be Txed.
925 * @ndev: Pointer to net_device structure.
926 *
927 * Return: NETDEV_TX_OK, on success
928 * NETDEV_TX_BUSY, if any of the descriptors are not free
929 *
930 * This function is invoked from upper layers to initiate transmission. The
931 * function uses the next available free BDs and populates their fields to
932 * start the transmission. Additionally if checksum offloading is supported,
933 * it populates AXI Stream Control fields with appropriate values.
934 */
935static netdev_tx_t
936axienet_start_xmit(struct sk_buff *skb, struct net_device *ndev)
937{
938 u32 ii;
939 u32 num_frag;
940 u32 csum_start_off;
941 u32 csum_index_off;
942 skb_frag_t *frag;
943 dma_addr_t tail_p, phys;
944 u32 orig_tail_ptr, new_tail_ptr;
945 struct axienet_local *lp = netdev_priv(ndev);
946 struct axidma_bd *cur_p;
947
948 orig_tail_ptr = lp->tx_bd_tail;
949 new_tail_ptr = orig_tail_ptr;
950
951 num_frag = skb_shinfo(skb)->nr_frags;
952 cur_p = &lp->tx_bd_v[orig_tail_ptr];
953
954 if (axienet_check_tx_bd_space(lp, num_frag + 1)) {
955 /* Should not happen as last start_xmit call should have
956 * checked for sufficient space and queue should only be
957 * woken when sufficient space is available.
958 */
959 netif_stop_queue(ndev);
960 if (net_ratelimit())
961 netdev_warn(ndev, "TX ring unexpectedly full\n");
962 return NETDEV_TX_BUSY;
963 }
964
965 if (skb->ip_summed == CHECKSUM_PARTIAL) {
966 if (lp->features & XAE_FEATURE_FULL_TX_CSUM) {
967 /* Tx Full Checksum Offload Enabled */
968 cur_p->app0 |= 2;
969 } else if (lp->features & XAE_FEATURE_PARTIAL_TX_CSUM) {
970 csum_start_off = skb_transport_offset(skb);
971 csum_index_off = csum_start_off + skb->csum_offset;
972 /* Tx Partial Checksum Offload Enabled */
973 cur_p->app0 |= 1;
974 cur_p->app1 = (csum_start_off << 16) | csum_index_off;
975 }
976 } else if (skb->ip_summed == CHECKSUM_UNNECESSARY) {
977 cur_p->app0 |= 2; /* Tx Full Checksum Offload Enabled */
978 }
979
980 phys = dma_map_single(lp->dev, skb->data,
981 skb_headlen(skb), DMA_TO_DEVICE);
982 if (unlikely(dma_mapping_error(lp->dev, phys))) {
983 if (net_ratelimit())
984 netdev_err(ndev, "TX DMA mapping error\n");
985 ndev->stats.tx_dropped++;
986 return NETDEV_TX_OK;
987 }
988 desc_set_phys_addr(lp, phys, cur_p);
989 cur_p->cntrl = skb_headlen(skb) | XAXIDMA_BD_CTRL_TXSOF_MASK;
990
991 for (ii = 0; ii < num_frag; ii++) {
992 if (++new_tail_ptr >= lp->tx_bd_num)
993 new_tail_ptr = 0;
994 cur_p = &lp->tx_bd_v[new_tail_ptr];
995 frag = &skb_shinfo(skb)->frags[ii];
996 phys = dma_map_single(lp->dev,
997 skb_frag_address(frag),
998 skb_frag_size(frag),
999 DMA_TO_DEVICE);
1000 if (unlikely(dma_mapping_error(lp->dev, phys))) {
1001 if (net_ratelimit())
1002 netdev_err(ndev, "TX DMA mapping error\n");
1003 ndev->stats.tx_dropped++;
1004 axienet_free_tx_chain(lp, orig_tail_ptr, ii + 1,
1005 true, NULL, 0);
1006 return NETDEV_TX_OK;
1007 }
1008 desc_set_phys_addr(lp, phys, cur_p);
1009 cur_p->cntrl = skb_frag_size(frag);
1010 }
1011
1012 cur_p->cntrl |= XAXIDMA_BD_CTRL_TXEOF_MASK;
1013 cur_p->skb = skb;
1014
1015 tail_p = lp->tx_bd_p + sizeof(*lp->tx_bd_v) * new_tail_ptr;
1016 if (++new_tail_ptr >= lp->tx_bd_num)
1017 new_tail_ptr = 0;
1018 WRITE_ONCE(lp->tx_bd_tail, new_tail_ptr);
1019
1020 /* Start the transfer */
1021 axienet_dma_out_addr(lp, XAXIDMA_TX_TDESC_OFFSET, tail_p);
1022
1023 /* Stop queue if next transmit may not have space */
1024 if (axienet_check_tx_bd_space(lp, MAX_SKB_FRAGS + 1)) {
1025 netif_stop_queue(ndev);
1026
1027 /* Matches barrier in axienet_tx_poll */
1028 smp_mb();
1029
1030 /* Space might have just been freed - check again */
1031 if (!axienet_check_tx_bd_space(lp, MAX_SKB_FRAGS + 1))
1032 netif_wake_queue(ndev);
1033 }
1034
1035 return NETDEV_TX_OK;
1036}
1037
1038/**
1039 * axienet_dma_rx_cb - DMA engine callback for RX channel.
1040 * @data: Pointer to the skbuf_dma_descriptor structure.
1041 * @result: error reporting through dmaengine_result.
1042 * This function is called by dmaengine driver for RX channel to notify
1043 * that the packet is received.
1044 */
1045static void axienet_dma_rx_cb(void *data, const struct dmaengine_result *result)
1046{
1047 struct skbuf_dma_descriptor *skbuf_dma;
1048 size_t meta_len, meta_max_len, rx_len;
1049 struct axienet_local *lp = data;
1050 struct sk_buff *skb;
1051 u32 *app_metadata;
1052
1053 skbuf_dma = axienet_get_rx_desc(lp, lp->rx_ring_tail++);
1054 skb = skbuf_dma->skb;
1055 app_metadata = dmaengine_desc_get_metadata_ptr(skbuf_dma->desc, &meta_len,
1056 &meta_max_len);
1057 dma_unmap_single(lp->dev, skbuf_dma->dma_address, lp->max_frm_size,
1058 DMA_FROM_DEVICE);
1059 /* TODO: Derive app word index programmatically */
1060 rx_len = (app_metadata[LEN_APP] & 0xFFFF);
1061 skb_put(skb, rx_len);
1062 skb->protocol = eth_type_trans(skb, lp->ndev);
1063 skb->ip_summed = CHECKSUM_NONE;
1064
1065 __netif_rx(skb);
1066 u64_stats_update_begin(&lp->rx_stat_sync);
1067 u64_stats_add(&lp->rx_packets, 1);
1068 u64_stats_add(&lp->rx_bytes, rx_len);
1069 u64_stats_update_end(&lp->rx_stat_sync);
1070 axienet_rx_submit_desc(lp->ndev);
1071 dma_async_issue_pending(lp->rx_chan);
1072}
1073
1074/**
1075 * axienet_rx_poll - Triggered by RX ISR to complete the BD processing.
1076 * @napi: Pointer to NAPI structure.
1077 * @budget: Max number of RX packets to process.
1078 *
1079 * Return: Number of RX packets processed.
1080 */
1081static int axienet_rx_poll(struct napi_struct *napi, int budget)
1082{
1083 u32 length;
1084 u32 csumstatus;
1085 u32 size = 0;
1086 int packets = 0;
1087 dma_addr_t tail_p = 0;
1088 struct axidma_bd *cur_p;
1089 struct sk_buff *skb, *new_skb;
1090 struct axienet_local *lp = container_of(napi, struct axienet_local, napi_rx);
1091
1092 cur_p = &lp->rx_bd_v[lp->rx_bd_ci];
1093
1094 while (packets < budget && (cur_p->status & XAXIDMA_BD_STS_COMPLETE_MASK)) {
1095 dma_addr_t phys;
1096
1097 /* Ensure we see complete descriptor update */
1098 dma_rmb();
1099
1100 skb = cur_p->skb;
1101 cur_p->skb = NULL;
1102
1103 /* skb could be NULL if a previous pass already received the
1104 * packet for this slot in the ring, but failed to refill it
1105 * with a newly allocated buffer. In this case, don't try to
1106 * receive it again.
1107 */
1108 if (likely(skb)) {
1109 length = cur_p->app4 & 0x0000FFFF;
1110
1111 phys = desc_get_phys_addr(lp, cur_p);
1112 dma_unmap_single(lp->dev, phys, lp->max_frm_size,
1113 DMA_FROM_DEVICE);
1114
1115 skb_put(skb, length);
1116 skb->protocol = eth_type_trans(skb, lp->ndev);
1117 /*skb_checksum_none_assert(skb);*/
1118 skb->ip_summed = CHECKSUM_NONE;
1119
1120 /* if we're doing Rx csum offload, set it up */
1121 if (lp->features & XAE_FEATURE_FULL_RX_CSUM) {
1122 csumstatus = (cur_p->app2 &
1123 XAE_FULL_CSUM_STATUS_MASK) >> 3;
1124 if (csumstatus == XAE_IP_TCP_CSUM_VALIDATED ||
1125 csumstatus == XAE_IP_UDP_CSUM_VALIDATED) {
1126 skb->ip_summed = CHECKSUM_UNNECESSARY;
1127 }
1128 } else if ((lp->features & XAE_FEATURE_PARTIAL_RX_CSUM) != 0 &&
1129 skb->protocol == htons(ETH_P_IP) &&
1130 skb->len > 64) {
1131 skb->csum = be32_to_cpu(cur_p->app3 & 0xFFFF);
1132 skb->ip_summed = CHECKSUM_COMPLETE;
1133 }
1134
1135 napi_gro_receive(napi, skb);
1136
1137 size += length;
1138 packets++;
1139 }
1140
1141 new_skb = napi_alloc_skb(napi, lp->max_frm_size);
1142 if (!new_skb)
1143 break;
1144
1145 phys = dma_map_single(lp->dev, new_skb->data,
1146 lp->max_frm_size,
1147 DMA_FROM_DEVICE);
1148 if (unlikely(dma_mapping_error(lp->dev, phys))) {
1149 if (net_ratelimit())
1150 netdev_err(lp->ndev, "RX DMA mapping error\n");
1151 dev_kfree_skb(new_skb);
1152 break;
1153 }
1154 desc_set_phys_addr(lp, phys, cur_p);
1155
1156 cur_p->cntrl = lp->max_frm_size;
1157 cur_p->status = 0;
1158 cur_p->skb = new_skb;
1159
1160 /* Only update tail_p to mark this slot as usable after it has
1161 * been successfully refilled.
1162 */
1163 tail_p = lp->rx_bd_p + sizeof(*lp->rx_bd_v) * lp->rx_bd_ci;
1164
1165 if (++lp->rx_bd_ci >= lp->rx_bd_num)
1166 lp->rx_bd_ci = 0;
1167 cur_p = &lp->rx_bd_v[lp->rx_bd_ci];
1168 }
1169
1170 u64_stats_update_begin(&lp->rx_stat_sync);
1171 u64_stats_add(&lp->rx_packets, packets);
1172 u64_stats_add(&lp->rx_bytes, size);
1173 u64_stats_update_end(&lp->rx_stat_sync);
1174
1175 if (tail_p)
1176 axienet_dma_out_addr(lp, XAXIDMA_RX_TDESC_OFFSET, tail_p);
1177
1178 if (packets < budget && napi_complete_done(napi, packets)) {
1179 /* Re-enable RX completion interrupts. This should
1180 * cause an immediate interrupt if any RX packets are
1181 * already pending.
1182 */
1183 axienet_dma_out32(lp, XAXIDMA_RX_CR_OFFSET, lp->rx_dma_cr);
1184 }
1185 return packets;
1186}
1187
1188/**
1189 * axienet_tx_irq - Tx Done Isr.
1190 * @irq: irq number
1191 * @_ndev: net_device pointer
1192 *
1193 * Return: IRQ_HANDLED if device generated a TX interrupt, IRQ_NONE otherwise.
1194 *
1195 * This is the Axi DMA Tx done Isr. It invokes NAPI polling to complete the
1196 * TX BD processing.
1197 */
1198static irqreturn_t axienet_tx_irq(int irq, void *_ndev)
1199{
1200 unsigned int status;
1201 struct net_device *ndev = _ndev;
1202 struct axienet_local *lp = netdev_priv(ndev);
1203
1204 status = axienet_dma_in32(lp, XAXIDMA_TX_SR_OFFSET);
1205
1206 if (!(status & XAXIDMA_IRQ_ALL_MASK))
1207 return IRQ_NONE;
1208
1209 axienet_dma_out32(lp, XAXIDMA_TX_SR_OFFSET, status);
1210
1211 if (unlikely(status & XAXIDMA_IRQ_ERROR_MASK)) {
1212 netdev_err(ndev, "DMA Tx error 0x%x\n", status);
1213 netdev_err(ndev, "Current BD is at: 0x%x%08x\n",
1214 (lp->tx_bd_v[lp->tx_bd_ci]).phys_msb,
1215 (lp->tx_bd_v[lp->tx_bd_ci]).phys);
1216 schedule_work(&lp->dma_err_task);
1217 } else {
1218 /* Disable further TX completion interrupts and schedule
1219 * NAPI to handle the completions.
1220 */
1221 u32 cr = lp->tx_dma_cr;
1222
1223 cr &= ~(XAXIDMA_IRQ_IOC_MASK | XAXIDMA_IRQ_DELAY_MASK);
1224 axienet_dma_out32(lp, XAXIDMA_TX_CR_OFFSET, cr);
1225
1226 napi_schedule(&lp->napi_tx);
1227 }
1228
1229 return IRQ_HANDLED;
1230}
1231
1232/**
1233 * axienet_rx_irq - Rx Isr.
1234 * @irq: irq number
1235 * @_ndev: net_device pointer
1236 *
1237 * Return: IRQ_HANDLED if device generated a RX interrupt, IRQ_NONE otherwise.
1238 *
1239 * This is the Axi DMA Rx Isr. It invokes NAPI polling to complete the RX BD
1240 * processing.
1241 */
1242static irqreturn_t axienet_rx_irq(int irq, void *_ndev)
1243{
1244 unsigned int status;
1245 struct net_device *ndev = _ndev;
1246 struct axienet_local *lp = netdev_priv(ndev);
1247
1248 status = axienet_dma_in32(lp, XAXIDMA_RX_SR_OFFSET);
1249
1250 if (!(status & XAXIDMA_IRQ_ALL_MASK))
1251 return IRQ_NONE;
1252
1253 axienet_dma_out32(lp, XAXIDMA_RX_SR_OFFSET, status);
1254
1255 if (unlikely(status & XAXIDMA_IRQ_ERROR_MASK)) {
1256 netdev_err(ndev, "DMA Rx error 0x%x\n", status);
1257 netdev_err(ndev, "Current BD is at: 0x%x%08x\n",
1258 (lp->rx_bd_v[lp->rx_bd_ci]).phys_msb,
1259 (lp->rx_bd_v[lp->rx_bd_ci]).phys);
1260 schedule_work(&lp->dma_err_task);
1261 } else {
1262 /* Disable further RX completion interrupts and schedule
1263 * NAPI receive.
1264 */
1265 u32 cr = lp->rx_dma_cr;
1266
1267 cr &= ~(XAXIDMA_IRQ_IOC_MASK | XAXIDMA_IRQ_DELAY_MASK);
1268 axienet_dma_out32(lp, XAXIDMA_RX_CR_OFFSET, cr);
1269
1270 napi_schedule(&lp->napi_rx);
1271 }
1272
1273 return IRQ_HANDLED;
1274}
1275
1276/**
1277 * axienet_eth_irq - Ethernet core Isr.
1278 * @irq: irq number
1279 * @_ndev: net_device pointer
1280 *
1281 * Return: IRQ_HANDLED if device generated a core interrupt, IRQ_NONE otherwise.
1282 *
1283 * Handle miscellaneous conditions indicated by Ethernet core IRQ.
1284 */
1285static irqreturn_t axienet_eth_irq(int irq, void *_ndev)
1286{
1287 struct net_device *ndev = _ndev;
1288 struct axienet_local *lp = netdev_priv(ndev);
1289 unsigned int pending;
1290
1291 pending = axienet_ior(lp, XAE_IP_OFFSET);
1292 if (!pending)
1293 return IRQ_NONE;
1294
1295 if (pending & XAE_INT_RXFIFOOVR_MASK)
1296 ndev->stats.rx_missed_errors++;
1297
1298 if (pending & XAE_INT_RXRJECT_MASK)
1299 ndev->stats.rx_frame_errors++;
1300
1301 axienet_iow(lp, XAE_IS_OFFSET, pending);
1302 return IRQ_HANDLED;
1303}
1304
1305static void axienet_dma_err_handler(struct work_struct *work);
1306
1307/**
1308 * axienet_rx_submit_desc - Submit the rx descriptors to dmaengine.
1309 * allocate skbuff, map the scatterlist and obtain a descriptor
1310 * and then add the callback information and submit descriptor.
1311 *
1312 * @ndev: net_device pointer
1313 *
1314 */
1315static void axienet_rx_submit_desc(struct net_device *ndev)
1316{
1317 struct dma_async_tx_descriptor *dma_rx_desc = NULL;
1318 struct axienet_local *lp = netdev_priv(ndev);
1319 struct skbuf_dma_descriptor *skbuf_dma;
1320 struct sk_buff *skb;
1321 dma_addr_t addr;
1322
1323 skbuf_dma = axienet_get_rx_desc(lp, lp->rx_ring_head);
1324 if (!skbuf_dma)
1325 return;
1326
1327 lp->rx_ring_head++;
1328 skb = netdev_alloc_skb(ndev, lp->max_frm_size);
1329 if (!skb)
1330 return;
1331
1332 sg_init_table(skbuf_dma->sgl, 1);
1333 addr = dma_map_single(lp->dev, skb->data, lp->max_frm_size, DMA_FROM_DEVICE);
1334 if (unlikely(dma_mapping_error(lp->dev, addr))) {
1335 if (net_ratelimit())
1336 netdev_err(ndev, "DMA mapping error\n");
1337 goto rx_submit_err_free_skb;
1338 }
1339 sg_dma_address(skbuf_dma->sgl) = addr;
1340 sg_dma_len(skbuf_dma->sgl) = lp->max_frm_size;
1341 dma_rx_desc = dmaengine_prep_slave_sg(lp->rx_chan, skbuf_dma->sgl,
1342 1, DMA_DEV_TO_MEM,
1343 DMA_PREP_INTERRUPT);
1344 if (!dma_rx_desc)
1345 goto rx_submit_err_unmap_skb;
1346
1347 skbuf_dma->skb = skb;
1348 skbuf_dma->dma_address = sg_dma_address(skbuf_dma->sgl);
1349 skbuf_dma->desc = dma_rx_desc;
1350 dma_rx_desc->callback_param = lp;
1351 dma_rx_desc->callback_result = axienet_dma_rx_cb;
1352 dmaengine_submit(dma_rx_desc);
1353
1354 return;
1355
1356rx_submit_err_unmap_skb:
1357 dma_unmap_single(lp->dev, addr, lp->max_frm_size, DMA_FROM_DEVICE);
1358rx_submit_err_free_skb:
1359 dev_kfree_skb(skb);
1360}
1361
1362/**
1363 * axienet_init_dmaengine - init the dmaengine code.
1364 * @ndev: Pointer to net_device structure
1365 *
1366 * Return: 0, on success.
1367 * non-zero error value on failure
1368 *
1369 * This is the dmaengine initialization code.
1370 */
1371static int axienet_init_dmaengine(struct net_device *ndev)
1372{
1373 struct axienet_local *lp = netdev_priv(ndev);
1374 struct skbuf_dma_descriptor *skbuf_dma;
1375 int i, ret;
1376
1377 lp->tx_chan = dma_request_chan(lp->dev, "tx_chan0");
1378 if (IS_ERR(lp->tx_chan)) {
1379 dev_err(lp->dev, "No Ethernet DMA (TX) channel found\n");
1380 return PTR_ERR(lp->tx_chan);
1381 }
1382
1383 lp->rx_chan = dma_request_chan(lp->dev, "rx_chan0");
1384 if (IS_ERR(lp->rx_chan)) {
1385 ret = PTR_ERR(lp->rx_chan);
1386 dev_err(lp->dev, "No Ethernet DMA (RX) channel found\n");
1387 goto err_dma_release_tx;
1388 }
1389
1390 lp->tx_ring_tail = 0;
1391 lp->tx_ring_head = 0;
1392 lp->rx_ring_tail = 0;
1393 lp->rx_ring_head = 0;
1394 lp->tx_skb_ring = kcalloc(TX_BD_NUM_MAX, sizeof(*lp->tx_skb_ring),
1395 GFP_KERNEL);
1396 if (!lp->tx_skb_ring) {
1397 ret = -ENOMEM;
1398 goto err_dma_release_rx;
1399 }
1400 for (i = 0; i < TX_BD_NUM_MAX; i++) {
1401 skbuf_dma = kzalloc(sizeof(*skbuf_dma), GFP_KERNEL);
1402 if (!skbuf_dma) {
1403 ret = -ENOMEM;
1404 goto err_free_tx_skb_ring;
1405 }
1406 lp->tx_skb_ring[i] = skbuf_dma;
1407 }
1408
1409 lp->rx_skb_ring = kcalloc(RX_BUF_NUM_DEFAULT, sizeof(*lp->rx_skb_ring),
1410 GFP_KERNEL);
1411 if (!lp->rx_skb_ring) {
1412 ret = -ENOMEM;
1413 goto err_free_tx_skb_ring;
1414 }
1415 for (i = 0; i < RX_BUF_NUM_DEFAULT; i++) {
1416 skbuf_dma = kzalloc(sizeof(*skbuf_dma), GFP_KERNEL);
1417 if (!skbuf_dma) {
1418 ret = -ENOMEM;
1419 goto err_free_rx_skb_ring;
1420 }
1421 lp->rx_skb_ring[i] = skbuf_dma;
1422 }
1423 /* TODO: Instead of BD_NUM_DEFAULT use runtime support */
1424 for (i = 0; i < RX_BUF_NUM_DEFAULT; i++)
1425 axienet_rx_submit_desc(ndev);
1426 dma_async_issue_pending(lp->rx_chan);
1427
1428 return 0;
1429
1430err_free_rx_skb_ring:
1431 for (i = 0; i < RX_BUF_NUM_DEFAULT; i++)
1432 kfree(lp->rx_skb_ring[i]);
1433 kfree(lp->rx_skb_ring);
1434err_free_tx_skb_ring:
1435 for (i = 0; i < TX_BD_NUM_MAX; i++)
1436 kfree(lp->tx_skb_ring[i]);
1437 kfree(lp->tx_skb_ring);
1438err_dma_release_rx:
1439 dma_release_channel(lp->rx_chan);
1440err_dma_release_tx:
1441 dma_release_channel(lp->tx_chan);
1442 return ret;
1443}
1444
1445/**
1446 * axienet_init_legacy_dma - init the dma legacy code.
1447 * @ndev: Pointer to net_device structure
1448 *
1449 * Return: 0, on success.
1450 * non-zero error value on failure
1451 *
1452 * This is the dma initialization code. It also allocates interrupt
1453 * service routines, enables the interrupt lines and ISR handling.
1454 *
1455 */
1456static int axienet_init_legacy_dma(struct net_device *ndev)
1457{
1458 int ret;
1459 struct axienet_local *lp = netdev_priv(ndev);
1460
1461 /* Enable worker thread for Axi DMA error handling */
1462 INIT_WORK(&lp->dma_err_task, axienet_dma_err_handler);
1463
1464 napi_enable(&lp->napi_rx);
1465 napi_enable(&lp->napi_tx);
1466
1467 /* Enable interrupts for Axi DMA Tx */
1468 ret = request_irq(lp->tx_irq, axienet_tx_irq, IRQF_SHARED,
1469 ndev->name, ndev);
1470 if (ret)
1471 goto err_tx_irq;
1472 /* Enable interrupts for Axi DMA Rx */
1473 ret = request_irq(lp->rx_irq, axienet_rx_irq, IRQF_SHARED,
1474 ndev->name, ndev);
1475 if (ret)
1476 goto err_rx_irq;
1477 /* Enable interrupts for Axi Ethernet core (if defined) */
1478 if (lp->eth_irq > 0) {
1479 ret = request_irq(lp->eth_irq, axienet_eth_irq, IRQF_SHARED,
1480 ndev->name, ndev);
1481 if (ret)
1482 goto err_eth_irq;
1483 }
1484
1485 return 0;
1486
1487err_eth_irq:
1488 free_irq(lp->rx_irq, ndev);
1489err_rx_irq:
1490 free_irq(lp->tx_irq, ndev);
1491err_tx_irq:
1492 napi_disable(&lp->napi_tx);
1493 napi_disable(&lp->napi_rx);
1494 cancel_work_sync(&lp->dma_err_task);
1495 dev_err(lp->dev, "request_irq() failed\n");
1496 return ret;
1497}
1498
1499/**
1500 * axienet_open - Driver open routine.
1501 * @ndev: Pointer to net_device structure
1502 *
1503 * Return: 0, on success.
1504 * non-zero error value on failure
1505 *
1506 * This is the driver open routine. It calls phylink_start to start the
1507 * PHY device.
1508 * It also allocates interrupt service routines, enables the interrupt lines
1509 * and ISR handling. Axi Ethernet core is reset through Axi DMA core. Buffer
1510 * descriptors are initialized.
1511 */
1512static int axienet_open(struct net_device *ndev)
1513{
1514 int ret;
1515 struct axienet_local *lp = netdev_priv(ndev);
1516
1517 dev_dbg(&ndev->dev, "%s\n", __func__);
1518
1519 /* When we do an Axi Ethernet reset, it resets the complete core
1520 * including the MDIO. MDIO must be disabled before resetting.
1521 * Hold MDIO bus lock to avoid MDIO accesses during the reset.
1522 */
1523 axienet_lock_mii(lp);
1524 ret = axienet_device_reset(ndev);
1525 axienet_unlock_mii(lp);
1526
1527 ret = phylink_of_phy_connect(lp->phylink, lp->dev->of_node, 0);
1528 if (ret) {
1529 dev_err(lp->dev, "phylink_of_phy_connect() failed: %d\n", ret);
1530 return ret;
1531 }
1532
1533 phylink_start(lp->phylink);
1534
1535 if (lp->use_dmaengine) {
1536 /* Enable interrupts for Axi Ethernet core (if defined) */
1537 if (lp->eth_irq > 0) {
1538 ret = request_irq(lp->eth_irq, axienet_eth_irq, IRQF_SHARED,
1539 ndev->name, ndev);
1540 if (ret)
1541 goto err_phy;
1542 }
1543
1544 ret = axienet_init_dmaengine(ndev);
1545 if (ret < 0)
1546 goto err_free_eth_irq;
1547 } else {
1548 ret = axienet_init_legacy_dma(ndev);
1549 if (ret)
1550 goto err_phy;
1551 }
1552
1553 return 0;
1554
1555err_free_eth_irq:
1556 if (lp->eth_irq > 0)
1557 free_irq(lp->eth_irq, ndev);
1558err_phy:
1559 phylink_stop(lp->phylink);
1560 phylink_disconnect_phy(lp->phylink);
1561 return ret;
1562}
1563
1564/**
1565 * axienet_stop - Driver stop routine.
1566 * @ndev: Pointer to net_device structure
1567 *
1568 * Return: 0, on success.
1569 *
1570 * This is the driver stop routine. It calls phylink_disconnect to stop the PHY
1571 * device. It also removes the interrupt handlers and disables the interrupts.
1572 * The Axi DMA Tx/Rx BDs are released.
1573 */
1574static int axienet_stop(struct net_device *ndev)
1575{
1576 struct axienet_local *lp = netdev_priv(ndev);
1577 int i;
1578
1579 dev_dbg(&ndev->dev, "axienet_close()\n");
1580
1581 if (!lp->use_dmaengine) {
1582 napi_disable(&lp->napi_tx);
1583 napi_disable(&lp->napi_rx);
1584 }
1585
1586 phylink_stop(lp->phylink);
1587 phylink_disconnect_phy(lp->phylink);
1588
1589 axienet_setoptions(ndev, lp->options &
1590 ~(XAE_OPTION_TXEN | XAE_OPTION_RXEN));
1591
1592 if (!lp->use_dmaengine) {
1593 axienet_dma_stop(lp);
1594 cancel_work_sync(&lp->dma_err_task);
1595 free_irq(lp->tx_irq, ndev);
1596 free_irq(lp->rx_irq, ndev);
1597 axienet_dma_bd_release(ndev);
1598 } else {
1599 dmaengine_terminate_sync(lp->tx_chan);
1600 dmaengine_synchronize(lp->tx_chan);
1601 dmaengine_terminate_sync(lp->rx_chan);
1602 dmaengine_synchronize(lp->rx_chan);
1603
1604 for (i = 0; i < TX_BD_NUM_MAX; i++)
1605 kfree(lp->tx_skb_ring[i]);
1606 kfree(lp->tx_skb_ring);
1607 for (i = 0; i < RX_BUF_NUM_DEFAULT; i++)
1608 kfree(lp->rx_skb_ring[i]);
1609 kfree(lp->rx_skb_ring);
1610
1611 dma_release_channel(lp->rx_chan);
1612 dma_release_channel(lp->tx_chan);
1613 }
1614
1615 axienet_iow(lp, XAE_IE_OFFSET, 0);
1616
1617 if (lp->eth_irq > 0)
1618 free_irq(lp->eth_irq, ndev);
1619 return 0;
1620}
1621
1622/**
1623 * axienet_change_mtu - Driver change mtu routine.
1624 * @ndev: Pointer to net_device structure
1625 * @new_mtu: New mtu value to be applied
1626 *
1627 * Return: Always returns 0 (success).
1628 *
1629 * This is the change mtu driver routine. It checks if the Axi Ethernet
1630 * hardware supports jumbo frames before changing the mtu. This can be
1631 * called only when the device is not up.
1632 */
1633static int axienet_change_mtu(struct net_device *ndev, int new_mtu)
1634{
1635 struct axienet_local *lp = netdev_priv(ndev);
1636
1637 if (netif_running(ndev))
1638 return -EBUSY;
1639
1640 if ((new_mtu + VLAN_ETH_HLEN +
1641 XAE_TRL_SIZE) > lp->rxmem)
1642 return -EINVAL;
1643
1644 ndev->mtu = new_mtu;
1645
1646 return 0;
1647}
1648
1649#ifdef CONFIG_NET_POLL_CONTROLLER
1650/**
1651 * axienet_poll_controller - Axi Ethernet poll mechanism.
1652 * @ndev: Pointer to net_device structure
1653 *
1654 * This implements Rx/Tx ISR poll mechanisms. The interrupts are disabled prior
1655 * to polling the ISRs and are enabled back after the polling is done.
1656 */
1657static void axienet_poll_controller(struct net_device *ndev)
1658{
1659 struct axienet_local *lp = netdev_priv(ndev);
1660 disable_irq(lp->tx_irq);
1661 disable_irq(lp->rx_irq);
1662 axienet_rx_irq(lp->tx_irq, ndev);
1663 axienet_tx_irq(lp->rx_irq, ndev);
1664 enable_irq(lp->tx_irq);
1665 enable_irq(lp->rx_irq);
1666}
1667#endif
1668
1669static int axienet_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
1670{
1671 struct axienet_local *lp = netdev_priv(dev);
1672
1673 if (!netif_running(dev))
1674 return -EINVAL;
1675
1676 return phylink_mii_ioctl(lp->phylink, rq, cmd);
1677}
1678
1679static void
1680axienet_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
1681{
1682 struct axienet_local *lp = netdev_priv(dev);
1683 unsigned int start;
1684
1685 netdev_stats_to_stats64(stats, &dev->stats);
1686
1687 do {
1688 start = u64_stats_fetch_begin(&lp->rx_stat_sync);
1689 stats->rx_packets = u64_stats_read(&lp->rx_packets);
1690 stats->rx_bytes = u64_stats_read(&lp->rx_bytes);
1691 } while (u64_stats_fetch_retry(&lp->rx_stat_sync, start));
1692
1693 do {
1694 start = u64_stats_fetch_begin(&lp->tx_stat_sync);
1695 stats->tx_packets = u64_stats_read(&lp->tx_packets);
1696 stats->tx_bytes = u64_stats_read(&lp->tx_bytes);
1697 } while (u64_stats_fetch_retry(&lp->tx_stat_sync, start));
1698}
1699
1700static const struct net_device_ops axienet_netdev_ops = {
1701 .ndo_open = axienet_open,
1702 .ndo_stop = axienet_stop,
1703 .ndo_start_xmit = axienet_start_xmit,
1704 .ndo_get_stats64 = axienet_get_stats64,
1705 .ndo_change_mtu = axienet_change_mtu,
1706 .ndo_set_mac_address = netdev_set_mac_address,
1707 .ndo_validate_addr = eth_validate_addr,
1708 .ndo_eth_ioctl = axienet_ioctl,
1709 .ndo_set_rx_mode = axienet_set_multicast_list,
1710#ifdef CONFIG_NET_POLL_CONTROLLER
1711 .ndo_poll_controller = axienet_poll_controller,
1712#endif
1713};
1714
1715static const struct net_device_ops axienet_netdev_dmaengine_ops = {
1716 .ndo_open = axienet_open,
1717 .ndo_stop = axienet_stop,
1718 .ndo_start_xmit = axienet_start_xmit_dmaengine,
1719 .ndo_get_stats64 = axienet_get_stats64,
1720 .ndo_change_mtu = axienet_change_mtu,
1721 .ndo_set_mac_address = netdev_set_mac_address,
1722 .ndo_validate_addr = eth_validate_addr,
1723 .ndo_eth_ioctl = axienet_ioctl,
1724 .ndo_set_rx_mode = axienet_set_multicast_list,
1725};
1726
1727/**
1728 * axienet_ethtools_get_drvinfo - Get various Axi Ethernet driver information.
1729 * @ndev: Pointer to net_device structure
1730 * @ed: Pointer to ethtool_drvinfo structure
1731 *
1732 * This implements ethtool command for getting the driver information.
1733 * Issue "ethtool -i ethX" under linux prompt to execute this function.
1734 */
1735static void axienet_ethtools_get_drvinfo(struct net_device *ndev,
1736 struct ethtool_drvinfo *ed)
1737{
1738 strscpy(ed->driver, DRIVER_NAME, sizeof(ed->driver));
1739 strscpy(ed->version, DRIVER_VERSION, sizeof(ed->version));
1740}
1741
1742/**
1743 * axienet_ethtools_get_regs_len - Get the total regs length present in the
1744 * AxiEthernet core.
1745 * @ndev: Pointer to net_device structure
1746 *
1747 * This implements ethtool command for getting the total register length
1748 * information.
1749 *
1750 * Return: the total regs length
1751 */
1752static int axienet_ethtools_get_regs_len(struct net_device *ndev)
1753{
1754 return sizeof(u32) * AXIENET_REGS_N;
1755}
1756
1757/**
1758 * axienet_ethtools_get_regs - Dump the contents of all registers present
1759 * in AxiEthernet core.
1760 * @ndev: Pointer to net_device structure
1761 * @regs: Pointer to ethtool_regs structure
1762 * @ret: Void pointer used to return the contents of the registers.
1763 *
1764 * This implements ethtool command for getting the Axi Ethernet register dump.
1765 * Issue "ethtool -d ethX" to execute this function.
1766 */
1767static void axienet_ethtools_get_regs(struct net_device *ndev,
1768 struct ethtool_regs *regs, void *ret)
1769{
1770 u32 *data = (u32 *)ret;
1771 size_t len = sizeof(u32) * AXIENET_REGS_N;
1772 struct axienet_local *lp = netdev_priv(ndev);
1773
1774 regs->version = 0;
1775 regs->len = len;
1776
1777 memset(data, 0, len);
1778 data[0] = axienet_ior(lp, XAE_RAF_OFFSET);
1779 data[1] = axienet_ior(lp, XAE_TPF_OFFSET);
1780 data[2] = axienet_ior(lp, XAE_IFGP_OFFSET);
1781 data[3] = axienet_ior(lp, XAE_IS_OFFSET);
1782 data[4] = axienet_ior(lp, XAE_IP_OFFSET);
1783 data[5] = axienet_ior(lp, XAE_IE_OFFSET);
1784 data[6] = axienet_ior(lp, XAE_TTAG_OFFSET);
1785 data[7] = axienet_ior(lp, XAE_RTAG_OFFSET);
1786 data[8] = axienet_ior(lp, XAE_UAWL_OFFSET);
1787 data[9] = axienet_ior(lp, XAE_UAWU_OFFSET);
1788 data[10] = axienet_ior(lp, XAE_TPID0_OFFSET);
1789 data[11] = axienet_ior(lp, XAE_TPID1_OFFSET);
1790 data[12] = axienet_ior(lp, XAE_PPST_OFFSET);
1791 data[13] = axienet_ior(lp, XAE_RCW0_OFFSET);
1792 data[14] = axienet_ior(lp, XAE_RCW1_OFFSET);
1793 data[15] = axienet_ior(lp, XAE_TC_OFFSET);
1794 data[16] = axienet_ior(lp, XAE_FCC_OFFSET);
1795 data[17] = axienet_ior(lp, XAE_EMMC_OFFSET);
1796 data[18] = axienet_ior(lp, XAE_PHYC_OFFSET);
1797 data[19] = axienet_ior(lp, XAE_MDIO_MC_OFFSET);
1798 data[20] = axienet_ior(lp, XAE_MDIO_MCR_OFFSET);
1799 data[21] = axienet_ior(lp, XAE_MDIO_MWD_OFFSET);
1800 data[22] = axienet_ior(lp, XAE_MDIO_MRD_OFFSET);
1801 data[27] = axienet_ior(lp, XAE_UAW0_OFFSET);
1802 data[28] = axienet_ior(lp, XAE_UAW1_OFFSET);
1803 data[29] = axienet_ior(lp, XAE_FMI_OFFSET);
1804 data[30] = axienet_ior(lp, XAE_AF0_OFFSET);
1805 data[31] = axienet_ior(lp, XAE_AF1_OFFSET);
1806 if (!lp->use_dmaengine) {
1807 data[32] = axienet_dma_in32(lp, XAXIDMA_TX_CR_OFFSET);
1808 data[33] = axienet_dma_in32(lp, XAXIDMA_TX_SR_OFFSET);
1809 data[34] = axienet_dma_in32(lp, XAXIDMA_TX_CDESC_OFFSET);
1810 data[35] = axienet_dma_in32(lp, XAXIDMA_TX_TDESC_OFFSET);
1811 data[36] = axienet_dma_in32(lp, XAXIDMA_RX_CR_OFFSET);
1812 data[37] = axienet_dma_in32(lp, XAXIDMA_RX_SR_OFFSET);
1813 data[38] = axienet_dma_in32(lp, XAXIDMA_RX_CDESC_OFFSET);
1814 data[39] = axienet_dma_in32(lp, XAXIDMA_RX_TDESC_OFFSET);
1815 }
1816}
1817
1818static void
1819axienet_ethtools_get_ringparam(struct net_device *ndev,
1820 struct ethtool_ringparam *ering,
1821 struct kernel_ethtool_ringparam *kernel_ering,
1822 struct netlink_ext_ack *extack)
1823{
1824 struct axienet_local *lp = netdev_priv(ndev);
1825
1826 ering->rx_max_pending = RX_BD_NUM_MAX;
1827 ering->rx_mini_max_pending = 0;
1828 ering->rx_jumbo_max_pending = 0;
1829 ering->tx_max_pending = TX_BD_NUM_MAX;
1830 ering->rx_pending = lp->rx_bd_num;
1831 ering->rx_mini_pending = 0;
1832 ering->rx_jumbo_pending = 0;
1833 ering->tx_pending = lp->tx_bd_num;
1834}
1835
1836static int
1837axienet_ethtools_set_ringparam(struct net_device *ndev,
1838 struct ethtool_ringparam *ering,
1839 struct kernel_ethtool_ringparam *kernel_ering,
1840 struct netlink_ext_ack *extack)
1841{
1842 struct axienet_local *lp = netdev_priv(ndev);
1843
1844 if (ering->rx_pending > RX_BD_NUM_MAX ||
1845 ering->rx_mini_pending ||
1846 ering->rx_jumbo_pending ||
1847 ering->tx_pending < TX_BD_NUM_MIN ||
1848 ering->tx_pending > TX_BD_NUM_MAX)
1849 return -EINVAL;
1850
1851 if (netif_running(ndev))
1852 return -EBUSY;
1853
1854 lp->rx_bd_num = ering->rx_pending;
1855 lp->tx_bd_num = ering->tx_pending;
1856 return 0;
1857}
1858
1859/**
1860 * axienet_ethtools_get_pauseparam - Get the pause parameter setting for
1861 * Tx and Rx paths.
1862 * @ndev: Pointer to net_device structure
1863 * @epauseparm: Pointer to ethtool_pauseparam structure.
1864 *
1865 * This implements ethtool command for getting axi ethernet pause frame
1866 * setting. Issue "ethtool -a ethX" to execute this function.
1867 */
1868static void
1869axienet_ethtools_get_pauseparam(struct net_device *ndev,
1870 struct ethtool_pauseparam *epauseparm)
1871{
1872 struct axienet_local *lp = netdev_priv(ndev);
1873
1874 phylink_ethtool_get_pauseparam(lp->phylink, epauseparm);
1875}
1876
1877/**
1878 * axienet_ethtools_set_pauseparam - Set device pause parameter(flow control)
1879 * settings.
1880 * @ndev: Pointer to net_device structure
1881 * @epauseparm:Pointer to ethtool_pauseparam structure
1882 *
1883 * This implements ethtool command for enabling flow control on Rx and Tx
1884 * paths. Issue "ethtool -A ethX tx on|off" under linux prompt to execute this
1885 * function.
1886 *
1887 * Return: 0 on success, -EFAULT if device is running
1888 */
1889static int
1890axienet_ethtools_set_pauseparam(struct net_device *ndev,
1891 struct ethtool_pauseparam *epauseparm)
1892{
1893 struct axienet_local *lp = netdev_priv(ndev);
1894
1895 return phylink_ethtool_set_pauseparam(lp->phylink, epauseparm);
1896}
1897
1898/**
1899 * axienet_ethtools_get_coalesce - Get DMA interrupt coalescing count.
1900 * @ndev: Pointer to net_device structure
1901 * @ecoalesce: Pointer to ethtool_coalesce structure
1902 * @kernel_coal: ethtool CQE mode setting structure
1903 * @extack: extack for reporting error messages
1904 *
1905 * This implements ethtool command for getting the DMA interrupt coalescing
1906 * count on Tx and Rx paths. Issue "ethtool -c ethX" under linux prompt to
1907 * execute this function.
1908 *
1909 * Return: 0 always
1910 */
1911static int
1912axienet_ethtools_get_coalesce(struct net_device *ndev,
1913 struct ethtool_coalesce *ecoalesce,
1914 struct kernel_ethtool_coalesce *kernel_coal,
1915 struct netlink_ext_ack *extack)
1916{
1917 struct axienet_local *lp = netdev_priv(ndev);
1918
1919 ecoalesce->rx_max_coalesced_frames = lp->coalesce_count_rx;
1920 ecoalesce->rx_coalesce_usecs = lp->coalesce_usec_rx;
1921 ecoalesce->tx_max_coalesced_frames = lp->coalesce_count_tx;
1922 ecoalesce->tx_coalesce_usecs = lp->coalesce_usec_tx;
1923 return 0;
1924}
1925
1926/**
1927 * axienet_ethtools_set_coalesce - Set DMA interrupt coalescing count.
1928 * @ndev: Pointer to net_device structure
1929 * @ecoalesce: Pointer to ethtool_coalesce structure
1930 * @kernel_coal: ethtool CQE mode setting structure
1931 * @extack: extack for reporting error messages
1932 *
1933 * This implements ethtool command for setting the DMA interrupt coalescing
1934 * count on Tx and Rx paths. Issue "ethtool -C ethX rx-frames 5" under linux
1935 * prompt to execute this function.
1936 *
1937 * Return: 0, on success, Non-zero error value on failure.
1938 */
1939static int
1940axienet_ethtools_set_coalesce(struct net_device *ndev,
1941 struct ethtool_coalesce *ecoalesce,
1942 struct kernel_ethtool_coalesce *kernel_coal,
1943 struct netlink_ext_ack *extack)
1944{
1945 struct axienet_local *lp = netdev_priv(ndev);
1946
1947 if (netif_running(ndev)) {
1948 netdev_err(ndev,
1949 "Please stop netif before applying configuration\n");
1950 return -EFAULT;
1951 }
1952
1953 if (ecoalesce->rx_max_coalesced_frames)
1954 lp->coalesce_count_rx = ecoalesce->rx_max_coalesced_frames;
1955 if (ecoalesce->rx_coalesce_usecs)
1956 lp->coalesce_usec_rx = ecoalesce->rx_coalesce_usecs;
1957 if (ecoalesce->tx_max_coalesced_frames)
1958 lp->coalesce_count_tx = ecoalesce->tx_max_coalesced_frames;
1959 if (ecoalesce->tx_coalesce_usecs)
1960 lp->coalesce_usec_tx = ecoalesce->tx_coalesce_usecs;
1961
1962 return 0;
1963}
1964
1965static int
1966axienet_ethtools_get_link_ksettings(struct net_device *ndev,
1967 struct ethtool_link_ksettings *cmd)
1968{
1969 struct axienet_local *lp = netdev_priv(ndev);
1970
1971 return phylink_ethtool_ksettings_get(lp->phylink, cmd);
1972}
1973
1974static int
1975axienet_ethtools_set_link_ksettings(struct net_device *ndev,
1976 const struct ethtool_link_ksettings *cmd)
1977{
1978 struct axienet_local *lp = netdev_priv(ndev);
1979
1980 return phylink_ethtool_ksettings_set(lp->phylink, cmd);
1981}
1982
1983static int axienet_ethtools_nway_reset(struct net_device *dev)
1984{
1985 struct axienet_local *lp = netdev_priv(dev);
1986
1987 return phylink_ethtool_nway_reset(lp->phylink);
1988}
1989
1990static const struct ethtool_ops axienet_ethtool_ops = {
1991 .supported_coalesce_params = ETHTOOL_COALESCE_MAX_FRAMES |
1992 ETHTOOL_COALESCE_USECS,
1993 .get_drvinfo = axienet_ethtools_get_drvinfo,
1994 .get_regs_len = axienet_ethtools_get_regs_len,
1995 .get_regs = axienet_ethtools_get_regs,
1996 .get_link = ethtool_op_get_link,
1997 .get_ringparam = axienet_ethtools_get_ringparam,
1998 .set_ringparam = axienet_ethtools_set_ringparam,
1999 .get_pauseparam = axienet_ethtools_get_pauseparam,
2000 .set_pauseparam = axienet_ethtools_set_pauseparam,
2001 .get_coalesce = axienet_ethtools_get_coalesce,
2002 .set_coalesce = axienet_ethtools_set_coalesce,
2003 .get_link_ksettings = axienet_ethtools_get_link_ksettings,
2004 .set_link_ksettings = axienet_ethtools_set_link_ksettings,
2005 .nway_reset = axienet_ethtools_nway_reset,
2006};
2007
2008static struct axienet_local *pcs_to_axienet_local(struct phylink_pcs *pcs)
2009{
2010 return container_of(pcs, struct axienet_local, pcs);
2011}
2012
2013static void axienet_pcs_get_state(struct phylink_pcs *pcs,
2014 struct phylink_link_state *state)
2015{
2016 struct mdio_device *pcs_phy = pcs_to_axienet_local(pcs)->pcs_phy;
2017
2018 phylink_mii_c22_pcs_get_state(pcs_phy, state);
2019}
2020
2021static void axienet_pcs_an_restart(struct phylink_pcs *pcs)
2022{
2023 struct mdio_device *pcs_phy = pcs_to_axienet_local(pcs)->pcs_phy;
2024
2025 phylink_mii_c22_pcs_an_restart(pcs_phy);
2026}
2027
2028static int axienet_pcs_config(struct phylink_pcs *pcs, unsigned int neg_mode,
2029 phy_interface_t interface,
2030 const unsigned long *advertising,
2031 bool permit_pause_to_mac)
2032{
2033 struct mdio_device *pcs_phy = pcs_to_axienet_local(pcs)->pcs_phy;
2034 struct net_device *ndev = pcs_to_axienet_local(pcs)->ndev;
2035 struct axienet_local *lp = netdev_priv(ndev);
2036 int ret;
2037
2038 if (lp->switch_x_sgmii) {
2039 ret = mdiodev_write(pcs_phy, XLNX_MII_STD_SELECT_REG,
2040 interface == PHY_INTERFACE_MODE_SGMII ?
2041 XLNX_MII_STD_SELECT_SGMII : 0);
2042 if (ret < 0) {
2043 netdev_warn(ndev,
2044 "Failed to switch PHY interface: %d\n",
2045 ret);
2046 return ret;
2047 }
2048 }
2049
2050 ret = phylink_mii_c22_pcs_config(pcs_phy, interface, advertising,
2051 neg_mode);
2052 if (ret < 0)
2053 netdev_warn(ndev, "Failed to configure PCS: %d\n", ret);
2054
2055 return ret;
2056}
2057
2058static const struct phylink_pcs_ops axienet_pcs_ops = {
2059 .pcs_get_state = axienet_pcs_get_state,
2060 .pcs_config = axienet_pcs_config,
2061 .pcs_an_restart = axienet_pcs_an_restart,
2062};
2063
2064static struct phylink_pcs *axienet_mac_select_pcs(struct phylink_config *config,
2065 phy_interface_t interface)
2066{
2067 struct net_device *ndev = to_net_dev(config->dev);
2068 struct axienet_local *lp = netdev_priv(ndev);
2069
2070 if (interface == PHY_INTERFACE_MODE_1000BASEX ||
2071 interface == PHY_INTERFACE_MODE_SGMII)
2072 return &lp->pcs;
2073
2074 return NULL;
2075}
2076
2077static void axienet_mac_config(struct phylink_config *config, unsigned int mode,
2078 const struct phylink_link_state *state)
2079{
2080 /* nothing meaningful to do */
2081}
2082
2083static void axienet_mac_link_down(struct phylink_config *config,
2084 unsigned int mode,
2085 phy_interface_t interface)
2086{
2087 /* nothing meaningful to do */
2088}
2089
2090static void axienet_mac_link_up(struct phylink_config *config,
2091 struct phy_device *phy,
2092 unsigned int mode, phy_interface_t interface,
2093 int speed, int duplex,
2094 bool tx_pause, bool rx_pause)
2095{
2096 struct net_device *ndev = to_net_dev(config->dev);
2097 struct axienet_local *lp = netdev_priv(ndev);
2098 u32 emmc_reg, fcc_reg;
2099
2100 emmc_reg = axienet_ior(lp, XAE_EMMC_OFFSET);
2101 emmc_reg &= ~XAE_EMMC_LINKSPEED_MASK;
2102
2103 switch (speed) {
2104 case SPEED_1000:
2105 emmc_reg |= XAE_EMMC_LINKSPD_1000;
2106 break;
2107 case SPEED_100:
2108 emmc_reg |= XAE_EMMC_LINKSPD_100;
2109 break;
2110 case SPEED_10:
2111 emmc_reg |= XAE_EMMC_LINKSPD_10;
2112 break;
2113 default:
2114 dev_err(&ndev->dev,
2115 "Speed other than 10, 100 or 1Gbps is not supported\n");
2116 break;
2117 }
2118
2119 axienet_iow(lp, XAE_EMMC_OFFSET, emmc_reg);
2120
2121 fcc_reg = axienet_ior(lp, XAE_FCC_OFFSET);
2122 if (tx_pause)
2123 fcc_reg |= XAE_FCC_FCTX_MASK;
2124 else
2125 fcc_reg &= ~XAE_FCC_FCTX_MASK;
2126 if (rx_pause)
2127 fcc_reg |= XAE_FCC_FCRX_MASK;
2128 else
2129 fcc_reg &= ~XAE_FCC_FCRX_MASK;
2130 axienet_iow(lp, XAE_FCC_OFFSET, fcc_reg);
2131}
2132
2133static const struct phylink_mac_ops axienet_phylink_ops = {
2134 .mac_select_pcs = axienet_mac_select_pcs,
2135 .mac_config = axienet_mac_config,
2136 .mac_link_down = axienet_mac_link_down,
2137 .mac_link_up = axienet_mac_link_up,
2138};
2139
2140/**
2141 * axienet_dma_err_handler - Work queue task for Axi DMA Error
2142 * @work: pointer to work_struct
2143 *
2144 * Resets the Axi DMA and Axi Ethernet devices, and reconfigures the
2145 * Tx/Rx BDs.
2146 */
2147static void axienet_dma_err_handler(struct work_struct *work)
2148{
2149 u32 i;
2150 u32 axienet_status;
2151 struct axidma_bd *cur_p;
2152 struct axienet_local *lp = container_of(work, struct axienet_local,
2153 dma_err_task);
2154 struct net_device *ndev = lp->ndev;
2155
2156 napi_disable(&lp->napi_tx);
2157 napi_disable(&lp->napi_rx);
2158
2159 axienet_setoptions(ndev, lp->options &
2160 ~(XAE_OPTION_TXEN | XAE_OPTION_RXEN));
2161
2162 axienet_dma_stop(lp);
2163
2164 for (i = 0; i < lp->tx_bd_num; i++) {
2165 cur_p = &lp->tx_bd_v[i];
2166 if (cur_p->cntrl) {
2167 dma_addr_t addr = desc_get_phys_addr(lp, cur_p);
2168
2169 dma_unmap_single(lp->dev, addr,
2170 (cur_p->cntrl &
2171 XAXIDMA_BD_CTRL_LENGTH_MASK),
2172 DMA_TO_DEVICE);
2173 }
2174 if (cur_p->skb)
2175 dev_kfree_skb_irq(cur_p->skb);
2176 cur_p->phys = 0;
2177 cur_p->phys_msb = 0;
2178 cur_p->cntrl = 0;
2179 cur_p->status = 0;
2180 cur_p->app0 = 0;
2181 cur_p->app1 = 0;
2182 cur_p->app2 = 0;
2183 cur_p->app3 = 0;
2184 cur_p->app4 = 0;
2185 cur_p->skb = NULL;
2186 }
2187
2188 for (i = 0; i < lp->rx_bd_num; i++) {
2189 cur_p = &lp->rx_bd_v[i];
2190 cur_p->status = 0;
2191 cur_p->app0 = 0;
2192 cur_p->app1 = 0;
2193 cur_p->app2 = 0;
2194 cur_p->app3 = 0;
2195 cur_p->app4 = 0;
2196 }
2197
2198 lp->tx_bd_ci = 0;
2199 lp->tx_bd_tail = 0;
2200 lp->rx_bd_ci = 0;
2201
2202 axienet_dma_start(lp);
2203
2204 axienet_status = axienet_ior(lp, XAE_RCW1_OFFSET);
2205 axienet_status &= ~XAE_RCW1_RX_MASK;
2206 axienet_iow(lp, XAE_RCW1_OFFSET, axienet_status);
2207
2208 axienet_status = axienet_ior(lp, XAE_IP_OFFSET);
2209 if (axienet_status & XAE_INT_RXRJECT_MASK)
2210 axienet_iow(lp, XAE_IS_OFFSET, XAE_INT_RXRJECT_MASK);
2211 axienet_iow(lp, XAE_IE_OFFSET, lp->eth_irq > 0 ?
2212 XAE_INT_RECV_ERROR_MASK : 0);
2213 axienet_iow(lp, XAE_FCC_OFFSET, XAE_FCC_FCRX_MASK);
2214
2215 /* Sync default options with HW but leave receiver and
2216 * transmitter disabled.
2217 */
2218 axienet_setoptions(ndev, lp->options &
2219 ~(XAE_OPTION_TXEN | XAE_OPTION_RXEN));
2220 axienet_set_mac_address(ndev, NULL);
2221 axienet_set_multicast_list(ndev);
2222 axienet_setoptions(ndev, lp->options);
2223 napi_enable(&lp->napi_rx);
2224 napi_enable(&lp->napi_tx);
2225}
2226
2227/**
2228 * axienet_probe - Axi Ethernet probe function.
2229 * @pdev: Pointer to platform device structure.
2230 *
2231 * Return: 0, on success
2232 * Non-zero error value on failure.
2233 *
2234 * This is the probe routine for Axi Ethernet driver. This is called before
2235 * any other driver routines are invoked. It allocates and sets up the Ethernet
2236 * device. Parses through device tree and populates fields of
2237 * axienet_local. It registers the Ethernet device.
2238 */
2239static int axienet_probe(struct platform_device *pdev)
2240{
2241 int ret;
2242 struct device_node *np;
2243 struct axienet_local *lp;
2244 struct net_device *ndev;
2245 struct resource *ethres;
2246 u8 mac_addr[ETH_ALEN];
2247 int addr_width = 32;
2248 u32 value;
2249
2250 ndev = alloc_etherdev(sizeof(*lp));
2251 if (!ndev)
2252 return -ENOMEM;
2253
2254 platform_set_drvdata(pdev, ndev);
2255
2256 SET_NETDEV_DEV(ndev, &pdev->dev);
2257 ndev->flags &= ~IFF_MULTICAST; /* clear multicast */
2258 ndev->features = NETIF_F_SG;
2259 ndev->ethtool_ops = &axienet_ethtool_ops;
2260
2261 /* MTU range: 64 - 9000 */
2262 ndev->min_mtu = 64;
2263 ndev->max_mtu = XAE_JUMBO_MTU;
2264
2265 lp = netdev_priv(ndev);
2266 lp->ndev = ndev;
2267 lp->dev = &pdev->dev;
2268 lp->options = XAE_OPTION_DEFAULTS;
2269 lp->rx_bd_num = RX_BD_NUM_DEFAULT;
2270 lp->tx_bd_num = TX_BD_NUM_DEFAULT;
2271
2272 u64_stats_init(&lp->rx_stat_sync);
2273 u64_stats_init(&lp->tx_stat_sync);
2274
2275 lp->axi_clk = devm_clk_get_optional(&pdev->dev, "s_axi_lite_clk");
2276 if (!lp->axi_clk) {
2277 /* For backward compatibility, if named AXI clock is not present,
2278 * treat the first clock specified as the AXI clock.
2279 */
2280 lp->axi_clk = devm_clk_get_optional(&pdev->dev, NULL);
2281 }
2282 if (IS_ERR(lp->axi_clk)) {
2283 ret = PTR_ERR(lp->axi_clk);
2284 goto free_netdev;
2285 }
2286 ret = clk_prepare_enable(lp->axi_clk);
2287 if (ret) {
2288 dev_err(&pdev->dev, "Unable to enable AXI clock: %d\n", ret);
2289 goto free_netdev;
2290 }
2291
2292 lp->misc_clks[0].id = "axis_clk";
2293 lp->misc_clks[1].id = "ref_clk";
2294 lp->misc_clks[2].id = "mgt_clk";
2295
2296 ret = devm_clk_bulk_get_optional(&pdev->dev, XAE_NUM_MISC_CLOCKS, lp->misc_clks);
2297 if (ret)
2298 goto cleanup_clk;
2299
2300 ret = clk_bulk_prepare_enable(XAE_NUM_MISC_CLOCKS, lp->misc_clks);
2301 if (ret)
2302 goto cleanup_clk;
2303
2304 /* Map device registers */
2305 lp->regs = devm_platform_get_and_ioremap_resource(pdev, 0, ðres);
2306 if (IS_ERR(lp->regs)) {
2307 ret = PTR_ERR(lp->regs);
2308 goto cleanup_clk;
2309 }
2310 lp->regs_start = ethres->start;
2311
2312 /* Setup checksum offload, but default to off if not specified */
2313 lp->features = 0;
2314
2315 ret = of_property_read_u32(pdev->dev.of_node, "xlnx,txcsum", &value);
2316 if (!ret) {
2317 switch (value) {
2318 case 1:
2319 lp->csum_offload_on_tx_path =
2320 XAE_FEATURE_PARTIAL_TX_CSUM;
2321 lp->features |= XAE_FEATURE_PARTIAL_TX_CSUM;
2322 /* Can checksum TCP/UDP over IPv4. */
2323 ndev->features |= NETIF_F_IP_CSUM;
2324 break;
2325 case 2:
2326 lp->csum_offload_on_tx_path =
2327 XAE_FEATURE_FULL_TX_CSUM;
2328 lp->features |= XAE_FEATURE_FULL_TX_CSUM;
2329 /* Can checksum TCP/UDP over IPv4. */
2330 ndev->features |= NETIF_F_IP_CSUM;
2331 break;
2332 default:
2333 lp->csum_offload_on_tx_path = XAE_NO_CSUM_OFFLOAD;
2334 }
2335 }
2336 ret = of_property_read_u32(pdev->dev.of_node, "xlnx,rxcsum", &value);
2337 if (!ret) {
2338 switch (value) {
2339 case 1:
2340 lp->csum_offload_on_rx_path =
2341 XAE_FEATURE_PARTIAL_RX_CSUM;
2342 lp->features |= XAE_FEATURE_PARTIAL_RX_CSUM;
2343 break;
2344 case 2:
2345 lp->csum_offload_on_rx_path =
2346 XAE_FEATURE_FULL_RX_CSUM;
2347 lp->features |= XAE_FEATURE_FULL_RX_CSUM;
2348 break;
2349 default:
2350 lp->csum_offload_on_rx_path = XAE_NO_CSUM_OFFLOAD;
2351 }
2352 }
2353 /* For supporting jumbo frames, the Axi Ethernet hardware must have
2354 * a larger Rx/Tx Memory. Typically, the size must be large so that
2355 * we can enable jumbo option and start supporting jumbo frames.
2356 * Here we check for memory allocated for Rx/Tx in the hardware from
2357 * the device-tree and accordingly set flags.
2358 */
2359 of_property_read_u32(pdev->dev.of_node, "xlnx,rxmem", &lp->rxmem);
2360
2361 lp->switch_x_sgmii = of_property_read_bool(pdev->dev.of_node,
2362 "xlnx,switch-x-sgmii");
2363
2364 /* Start with the proprietary, and broken phy_type */
2365 ret = of_property_read_u32(pdev->dev.of_node, "xlnx,phy-type", &value);
2366 if (!ret) {
2367 netdev_warn(ndev, "Please upgrade your device tree binary blob to use phy-mode");
2368 switch (value) {
2369 case XAE_PHY_TYPE_MII:
2370 lp->phy_mode = PHY_INTERFACE_MODE_MII;
2371 break;
2372 case XAE_PHY_TYPE_GMII:
2373 lp->phy_mode = PHY_INTERFACE_MODE_GMII;
2374 break;
2375 case XAE_PHY_TYPE_RGMII_2_0:
2376 lp->phy_mode = PHY_INTERFACE_MODE_RGMII_ID;
2377 break;
2378 case XAE_PHY_TYPE_SGMII:
2379 lp->phy_mode = PHY_INTERFACE_MODE_SGMII;
2380 break;
2381 case XAE_PHY_TYPE_1000BASE_X:
2382 lp->phy_mode = PHY_INTERFACE_MODE_1000BASEX;
2383 break;
2384 default:
2385 ret = -EINVAL;
2386 goto cleanup_clk;
2387 }
2388 } else {
2389 ret = of_get_phy_mode(pdev->dev.of_node, &lp->phy_mode);
2390 if (ret)
2391 goto cleanup_clk;
2392 }
2393 if (lp->switch_x_sgmii && lp->phy_mode != PHY_INTERFACE_MODE_SGMII &&
2394 lp->phy_mode != PHY_INTERFACE_MODE_1000BASEX) {
2395 dev_err(&pdev->dev, "xlnx,switch-x-sgmii only supported with SGMII or 1000BaseX\n");
2396 ret = -EINVAL;
2397 goto cleanup_clk;
2398 }
2399
2400 if (!of_find_property(pdev->dev.of_node, "dmas", NULL)) {
2401 /* Find the DMA node, map the DMA registers, and decode the DMA IRQs */
2402 np = of_parse_phandle(pdev->dev.of_node, "axistream-connected", 0);
2403
2404 if (np) {
2405 struct resource dmares;
2406
2407 ret = of_address_to_resource(np, 0, &dmares);
2408 if (ret) {
2409 dev_err(&pdev->dev,
2410 "unable to get DMA resource\n");
2411 of_node_put(np);
2412 goto cleanup_clk;
2413 }
2414 lp->dma_regs = devm_ioremap_resource(&pdev->dev,
2415 &dmares);
2416 lp->rx_irq = irq_of_parse_and_map(np, 1);
2417 lp->tx_irq = irq_of_parse_and_map(np, 0);
2418 of_node_put(np);
2419 lp->eth_irq = platform_get_irq_optional(pdev, 0);
2420 } else {
2421 /* Check for these resources directly on the Ethernet node. */
2422 lp->dma_regs = devm_platform_get_and_ioremap_resource(pdev, 1, NULL);
2423 lp->rx_irq = platform_get_irq(pdev, 1);
2424 lp->tx_irq = platform_get_irq(pdev, 0);
2425 lp->eth_irq = platform_get_irq_optional(pdev, 2);
2426 }
2427 if (IS_ERR(lp->dma_regs)) {
2428 dev_err(&pdev->dev, "could not map DMA regs\n");
2429 ret = PTR_ERR(lp->dma_regs);
2430 goto cleanup_clk;
2431 }
2432 if (lp->rx_irq <= 0 || lp->tx_irq <= 0) {
2433 dev_err(&pdev->dev, "could not determine irqs\n");
2434 ret = -ENOMEM;
2435 goto cleanup_clk;
2436 }
2437
2438 /* Reset core now that clocks are enabled, prior to accessing MDIO */
2439 ret = __axienet_device_reset(lp);
2440 if (ret)
2441 goto cleanup_clk;
2442
2443 /* Autodetect the need for 64-bit DMA pointers.
2444 * When the IP is configured for a bus width bigger than 32 bits,
2445 * writing the MSB registers is mandatory, even if they are all 0.
2446 * We can detect this case by writing all 1's to one such register
2447 * and see if that sticks: when the IP is configured for 32 bits
2448 * only, those registers are RES0.
2449 * Those MSB registers were introduced in IP v7.1, which we check first.
2450 */
2451 if ((axienet_ior(lp, XAE_ID_OFFSET) >> 24) >= 0x9) {
2452 void __iomem *desc = lp->dma_regs + XAXIDMA_TX_CDESC_OFFSET + 4;
2453
2454 iowrite32(0x0, desc);
2455 if (ioread32(desc) == 0) { /* sanity check */
2456 iowrite32(0xffffffff, desc);
2457 if (ioread32(desc) > 0) {
2458 lp->features |= XAE_FEATURE_DMA_64BIT;
2459 addr_width = 64;
2460 dev_info(&pdev->dev,
2461 "autodetected 64-bit DMA range\n");
2462 }
2463 iowrite32(0x0, desc);
2464 }
2465 }
2466 if (!IS_ENABLED(CONFIG_64BIT) && lp->features & XAE_FEATURE_DMA_64BIT) {
2467 dev_err(&pdev->dev, "64-bit addressable DMA is not compatible with 32-bit archecture\n");
2468 ret = -EINVAL;
2469 goto cleanup_clk;
2470 }
2471
2472 ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(addr_width));
2473 if (ret) {
2474 dev_err(&pdev->dev, "No suitable DMA available\n");
2475 goto cleanup_clk;
2476 }
2477 netif_napi_add(ndev, &lp->napi_rx, axienet_rx_poll);
2478 netif_napi_add(ndev, &lp->napi_tx, axienet_tx_poll);
2479 } else {
2480 struct xilinx_vdma_config cfg;
2481 struct dma_chan *tx_chan;
2482
2483 lp->eth_irq = platform_get_irq_optional(pdev, 0);
2484 if (lp->eth_irq < 0 && lp->eth_irq != -ENXIO) {
2485 ret = lp->eth_irq;
2486 goto cleanup_clk;
2487 }
2488 tx_chan = dma_request_chan(lp->dev, "tx_chan0");
2489 if (IS_ERR(tx_chan)) {
2490 ret = PTR_ERR(tx_chan);
2491 dev_err_probe(lp->dev, ret, "No Ethernet DMA (TX) channel found\n");
2492 goto cleanup_clk;
2493 }
2494
2495 cfg.reset = 1;
2496 /* As name says VDMA but it has support for DMA channel reset */
2497 ret = xilinx_vdma_channel_set_config(tx_chan, &cfg);
2498 if (ret < 0) {
2499 dev_err(&pdev->dev, "Reset channel failed\n");
2500 dma_release_channel(tx_chan);
2501 goto cleanup_clk;
2502 }
2503
2504 dma_release_channel(tx_chan);
2505 lp->use_dmaengine = 1;
2506 }
2507
2508 if (lp->use_dmaengine)
2509 ndev->netdev_ops = &axienet_netdev_dmaengine_ops;
2510 else
2511 ndev->netdev_ops = &axienet_netdev_ops;
2512 /* Check for Ethernet core IRQ (optional) */
2513 if (lp->eth_irq <= 0)
2514 dev_info(&pdev->dev, "Ethernet core IRQ not defined\n");
2515
2516 /* Retrieve the MAC address */
2517 ret = of_get_mac_address(pdev->dev.of_node, mac_addr);
2518 if (!ret) {
2519 axienet_set_mac_address(ndev, mac_addr);
2520 } else {
2521 dev_warn(&pdev->dev, "could not find MAC address property: %d\n",
2522 ret);
2523 axienet_set_mac_address(ndev, NULL);
2524 }
2525
2526 lp->coalesce_count_rx = XAXIDMA_DFT_RX_THRESHOLD;
2527 lp->coalesce_count_tx = XAXIDMA_DFT_TX_THRESHOLD;
2528 lp->coalesce_usec_rx = XAXIDMA_DFT_RX_USEC;
2529 lp->coalesce_usec_tx = XAXIDMA_DFT_TX_USEC;
2530
2531 ret = axienet_mdio_setup(lp);
2532 if (ret)
2533 dev_warn(&pdev->dev,
2534 "error registering MDIO bus: %d\n", ret);
2535
2536 if (lp->phy_mode == PHY_INTERFACE_MODE_SGMII ||
2537 lp->phy_mode == PHY_INTERFACE_MODE_1000BASEX) {
2538 np = of_parse_phandle(pdev->dev.of_node, "pcs-handle", 0);
2539 if (!np) {
2540 /* Deprecated: Always use "pcs-handle" for pcs_phy.
2541 * Falling back to "phy-handle" here is only for
2542 * backward compatibility with old device trees.
2543 */
2544 np = of_parse_phandle(pdev->dev.of_node, "phy-handle", 0);
2545 }
2546 if (!np) {
2547 dev_err(&pdev->dev, "pcs-handle (preferred) or phy-handle required for 1000BaseX/SGMII\n");
2548 ret = -EINVAL;
2549 goto cleanup_mdio;
2550 }
2551 lp->pcs_phy = of_mdio_find_device(np);
2552 if (!lp->pcs_phy) {
2553 ret = -EPROBE_DEFER;
2554 of_node_put(np);
2555 goto cleanup_mdio;
2556 }
2557 of_node_put(np);
2558 lp->pcs.ops = &axienet_pcs_ops;
2559 lp->pcs.neg_mode = true;
2560 lp->pcs.poll = true;
2561 }
2562
2563 lp->phylink_config.dev = &ndev->dev;
2564 lp->phylink_config.type = PHYLINK_NETDEV;
2565 lp->phylink_config.mac_capabilities = MAC_SYM_PAUSE | MAC_ASYM_PAUSE |
2566 MAC_10FD | MAC_100FD | MAC_1000FD;
2567
2568 __set_bit(lp->phy_mode, lp->phylink_config.supported_interfaces);
2569 if (lp->switch_x_sgmii) {
2570 __set_bit(PHY_INTERFACE_MODE_1000BASEX,
2571 lp->phylink_config.supported_interfaces);
2572 __set_bit(PHY_INTERFACE_MODE_SGMII,
2573 lp->phylink_config.supported_interfaces);
2574 }
2575
2576 lp->phylink = phylink_create(&lp->phylink_config, pdev->dev.fwnode,
2577 lp->phy_mode,
2578 &axienet_phylink_ops);
2579 if (IS_ERR(lp->phylink)) {
2580 ret = PTR_ERR(lp->phylink);
2581 dev_err(&pdev->dev, "phylink_create error (%i)\n", ret);
2582 goto cleanup_mdio;
2583 }
2584
2585 ret = register_netdev(lp->ndev);
2586 if (ret) {
2587 dev_err(lp->dev, "register_netdev() error (%i)\n", ret);
2588 goto cleanup_phylink;
2589 }
2590
2591 return 0;
2592
2593cleanup_phylink:
2594 phylink_destroy(lp->phylink);
2595
2596cleanup_mdio:
2597 if (lp->pcs_phy)
2598 put_device(&lp->pcs_phy->dev);
2599 if (lp->mii_bus)
2600 axienet_mdio_teardown(lp);
2601cleanup_clk:
2602 clk_bulk_disable_unprepare(XAE_NUM_MISC_CLOCKS, lp->misc_clks);
2603 clk_disable_unprepare(lp->axi_clk);
2604
2605free_netdev:
2606 free_netdev(ndev);
2607
2608 return ret;
2609}
2610
2611static void axienet_remove(struct platform_device *pdev)
2612{
2613 struct net_device *ndev = platform_get_drvdata(pdev);
2614 struct axienet_local *lp = netdev_priv(ndev);
2615
2616 unregister_netdev(ndev);
2617
2618 if (lp->phylink)
2619 phylink_destroy(lp->phylink);
2620
2621 if (lp->pcs_phy)
2622 put_device(&lp->pcs_phy->dev);
2623
2624 axienet_mdio_teardown(lp);
2625
2626 clk_bulk_disable_unprepare(XAE_NUM_MISC_CLOCKS, lp->misc_clks);
2627 clk_disable_unprepare(lp->axi_clk);
2628
2629 free_netdev(ndev);
2630}
2631
2632static void axienet_shutdown(struct platform_device *pdev)
2633{
2634 struct net_device *ndev = platform_get_drvdata(pdev);
2635
2636 rtnl_lock();
2637 netif_device_detach(ndev);
2638
2639 if (netif_running(ndev))
2640 dev_close(ndev);
2641
2642 rtnl_unlock();
2643}
2644
2645static int axienet_suspend(struct device *dev)
2646{
2647 struct net_device *ndev = dev_get_drvdata(dev);
2648
2649 if (!netif_running(ndev))
2650 return 0;
2651
2652 netif_device_detach(ndev);
2653
2654 rtnl_lock();
2655 axienet_stop(ndev);
2656 rtnl_unlock();
2657
2658 return 0;
2659}
2660
2661static int axienet_resume(struct device *dev)
2662{
2663 struct net_device *ndev = dev_get_drvdata(dev);
2664
2665 if (!netif_running(ndev))
2666 return 0;
2667
2668 rtnl_lock();
2669 axienet_open(ndev);
2670 rtnl_unlock();
2671
2672 netif_device_attach(ndev);
2673
2674 return 0;
2675}
2676
2677static DEFINE_SIMPLE_DEV_PM_OPS(axienet_pm_ops,
2678 axienet_suspend, axienet_resume);
2679
2680static struct platform_driver axienet_driver = {
2681 .probe = axienet_probe,
2682 .remove_new = axienet_remove,
2683 .shutdown = axienet_shutdown,
2684 .driver = {
2685 .name = "xilinx_axienet",
2686 .pm = &axienet_pm_ops,
2687 .of_match_table = axienet_of_match,
2688 },
2689};
2690
2691module_platform_driver(axienet_driver);
2692
2693MODULE_DESCRIPTION("Xilinx Axi Ethernet driver");
2694MODULE_AUTHOR("Xilinx");
2695MODULE_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 const 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 * Return: 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 * Return: 0, on success -ENOMEM, on failure
183 *
184 * This function is called to initialize the Rx and Tx DMA descriptor
185 * rings. This initializes the descriptors with required default values
186 * and is called when Axi Ethernet driver reset is called.
187 */
188static int axienet_dma_bd_init(struct net_device *ndev)
189{
190 u32 cr;
191 int i;
192 struct sk_buff *skb;
193 struct axienet_local *lp = netdev_priv(ndev);
194
195 /* Reset the indexes which are used for accessing the BDs */
196 lp->tx_bd_ci = 0;
197 lp->tx_bd_tail = 0;
198 lp->rx_bd_ci = 0;
199
200 /* Allocate the Tx and Rx buffer descriptors. */
201 lp->tx_bd_v = dma_zalloc_coherent(ndev->dev.parent,
202 sizeof(*lp->tx_bd_v) * TX_BD_NUM,
203 &lp->tx_bd_p, GFP_KERNEL);
204 if (!lp->tx_bd_v)
205 goto out;
206
207 lp->rx_bd_v = dma_zalloc_coherent(ndev->dev.parent,
208 sizeof(*lp->rx_bd_v) * RX_BD_NUM,
209 &lp->rx_bd_p, GFP_KERNEL);
210 if (!lp->rx_bd_v)
211 goto out;
212
213 for (i = 0; i < TX_BD_NUM; i++) {
214 lp->tx_bd_v[i].next = lp->tx_bd_p +
215 sizeof(*lp->tx_bd_v) *
216 ((i + 1) % TX_BD_NUM);
217 }
218
219 for (i = 0; i < RX_BD_NUM; i++) {
220 lp->rx_bd_v[i].next = lp->rx_bd_p +
221 sizeof(*lp->rx_bd_v) *
222 ((i + 1) % RX_BD_NUM);
223
224 skb = netdev_alloc_skb_ip_align(ndev, lp->max_frm_size);
225 if (!skb)
226 goto out;
227
228 lp->rx_bd_v[i].sw_id_offset = (u32) skb;
229 lp->rx_bd_v[i].phys = dma_map_single(ndev->dev.parent,
230 skb->data,
231 lp->max_frm_size,
232 DMA_FROM_DEVICE);
233 lp->rx_bd_v[i].cntrl = lp->max_frm_size;
234 }
235
236 /* Start updating the Rx channel control register */
237 cr = axienet_dma_in32(lp, XAXIDMA_RX_CR_OFFSET);
238 /* Update the interrupt coalesce count */
239 cr = ((cr & ~XAXIDMA_COALESCE_MASK) |
240 ((lp->coalesce_count_rx) << XAXIDMA_COALESCE_SHIFT));
241 /* Update the delay timer count */
242 cr = ((cr & ~XAXIDMA_DELAY_MASK) |
243 (XAXIDMA_DFT_RX_WAITBOUND << XAXIDMA_DELAY_SHIFT));
244 /* Enable coalesce, delay timer and error interrupts */
245 cr |= XAXIDMA_IRQ_ALL_MASK;
246 /* Write to the Rx channel control register */
247 axienet_dma_out32(lp, XAXIDMA_RX_CR_OFFSET, cr);
248
249 /* Start updating the Tx channel control register */
250 cr = axienet_dma_in32(lp, XAXIDMA_TX_CR_OFFSET);
251 /* Update the interrupt coalesce count */
252 cr = (((cr & ~XAXIDMA_COALESCE_MASK)) |
253 ((lp->coalesce_count_tx) << XAXIDMA_COALESCE_SHIFT));
254 /* Update the delay timer count */
255 cr = (((cr & ~XAXIDMA_DELAY_MASK)) |
256 (XAXIDMA_DFT_TX_WAITBOUND << XAXIDMA_DELAY_SHIFT));
257 /* Enable coalesce, delay timer and error interrupts */
258 cr |= XAXIDMA_IRQ_ALL_MASK;
259 /* Write to the Tx channel control register */
260 axienet_dma_out32(lp, XAXIDMA_TX_CR_OFFSET, cr);
261
262 /* Populate the tail pointer and bring the Rx Axi DMA engine out of
263 * halted state. This will make the Rx side ready for reception.
264 */
265 axienet_dma_out32(lp, XAXIDMA_RX_CDESC_OFFSET, lp->rx_bd_p);
266 cr = axienet_dma_in32(lp, XAXIDMA_RX_CR_OFFSET);
267 axienet_dma_out32(lp, XAXIDMA_RX_CR_OFFSET,
268 cr | XAXIDMA_CR_RUNSTOP_MASK);
269 axienet_dma_out32(lp, XAXIDMA_RX_TDESC_OFFSET, lp->rx_bd_p +
270 (sizeof(*lp->rx_bd_v) * (RX_BD_NUM - 1)));
271
272 /* Write to the RS (Run-stop) bit in the Tx channel control register.
273 * Tx channel is now ready to run. But only after we write to the
274 * tail pointer register that the Tx channel will start transmitting.
275 */
276 axienet_dma_out32(lp, XAXIDMA_TX_CDESC_OFFSET, lp->tx_bd_p);
277 cr = axienet_dma_in32(lp, XAXIDMA_TX_CR_OFFSET);
278 axienet_dma_out32(lp, XAXIDMA_TX_CR_OFFSET,
279 cr | XAXIDMA_CR_RUNSTOP_MASK);
280
281 return 0;
282out:
283 axienet_dma_bd_release(ndev);
284 return -ENOMEM;
285}
286
287/**
288 * axienet_set_mac_address - Write the MAC address
289 * @ndev: Pointer to the net_device structure
290 * @address: 6 byte Address to be written as MAC address
291 *
292 * This function is called to initialize the MAC address of the Axi Ethernet
293 * core. It writes to the UAW0 and UAW1 registers of the core.
294 */
295static void axienet_set_mac_address(struct net_device *ndev, void *address)
296{
297 struct axienet_local *lp = netdev_priv(ndev);
298
299 if (address)
300 memcpy(ndev->dev_addr, address, ETH_ALEN);
301 if (!is_valid_ether_addr(ndev->dev_addr))
302 eth_random_addr(ndev->dev_addr);
303
304 /* Set up unicast MAC address filter set its mac address */
305 axienet_iow(lp, XAE_UAW0_OFFSET,
306 (ndev->dev_addr[0]) |
307 (ndev->dev_addr[1] << 8) |
308 (ndev->dev_addr[2] << 16) |
309 (ndev->dev_addr[3] << 24));
310 axienet_iow(lp, XAE_UAW1_OFFSET,
311 (((axienet_ior(lp, XAE_UAW1_OFFSET)) &
312 ~XAE_UAW1_UNICASTADDR_MASK) |
313 (ndev->dev_addr[4] |
314 (ndev->dev_addr[5] << 8))));
315}
316
317/**
318 * netdev_set_mac_address - Write the MAC address (from outside the driver)
319 * @ndev: Pointer to the net_device structure
320 * @p: 6 byte Address to be written as MAC address
321 *
322 * Return: 0 for all conditions. Presently, there is no failure case.
323 *
324 * This function is called to initialize the MAC address of the Axi Ethernet
325 * core. It calls the core specific axienet_set_mac_address. This is the
326 * function that goes into net_device_ops structure entry ndo_set_mac_address.
327 */
328static int netdev_set_mac_address(struct net_device *ndev, void *p)
329{
330 struct sockaddr *addr = p;
331 axienet_set_mac_address(ndev, addr->sa_data);
332 return 0;
333}
334
335/**
336 * axienet_set_multicast_list - Prepare the multicast table
337 * @ndev: Pointer to the net_device structure
338 *
339 * This function is called to initialize the multicast table during
340 * initialization. The Axi Ethernet basic multicast support has a four-entry
341 * multicast table which is initialized here. Additionally this function
342 * goes into the net_device_ops structure entry ndo_set_multicast_list. This
343 * means whenever the multicast table entries need to be updated this
344 * function gets called.
345 */
346static void axienet_set_multicast_list(struct net_device *ndev)
347{
348 int i;
349 u32 reg, af0reg, af1reg;
350 struct axienet_local *lp = netdev_priv(ndev);
351
352 if (ndev->flags & (IFF_ALLMULTI | IFF_PROMISC) ||
353 netdev_mc_count(ndev) > XAE_MULTICAST_CAM_TABLE_NUM) {
354 /* We must make the kernel realize we had to move into
355 * promiscuous mode. If it was a promiscuous mode request
356 * the flag is already set. If not we set it.
357 */
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 */
443 axienet_dma_out32(lp, offset, XAXIDMA_CR_RESET_MASK);
444 timeout = DELAY_OF_ONE_MILLISEC;
445 while (axienet_dma_in32(lp, offset) & XAXIDMA_CR_RESET_MASK) {
446 udelay(1);
447 if (--timeout == 0) {
448 netdev_err(lp->ndev, "%s: DMA reset timeout!\n",
449 __func__);
450 break;
451 }
452 }
453}
454
455/**
456 * axienet_device_reset - Reset and initialize the Axi Ethernet hardware.
457 * @ndev: Pointer to the net_device structure
458 *
459 * This function is called to reset and initialize the Axi Ethernet core. This
460 * is typically called during initialization. It does a reset of the Axi DMA
461 * Rx/Tx channels and initializes the Axi DMA BDs. Since Axi DMA reset lines
462 * areconnected to Axi Ethernet reset lines, this in turn resets the Axi
463 * Ethernet core. No separate hardware reset is done for the Axi Ethernet
464 * core.
465 */
466static void axienet_device_reset(struct net_device *ndev)
467{
468 u32 axienet_status;
469 struct axienet_local *lp = netdev_priv(ndev);
470
471 __axienet_device_reset(lp, &ndev->dev, XAXIDMA_TX_CR_OFFSET);
472 __axienet_device_reset(lp, &ndev->dev, XAXIDMA_RX_CR_OFFSET);
473
474 lp->max_frm_size = XAE_MAX_VLAN_FRAME_SIZE;
475 lp->options |= XAE_OPTION_VLAN;
476 lp->options &= (~XAE_OPTION_JUMBO);
477
478 if ((ndev->mtu > XAE_MTU) &&
479 (ndev->mtu <= XAE_JUMBO_MTU)) {
480 lp->max_frm_size = ndev->mtu + VLAN_ETH_HLEN +
481 XAE_TRL_SIZE;
482
483 if (lp->max_frm_size <= lp->rxmem)
484 lp->options |= XAE_OPTION_JUMBO;
485 }
486
487 if (axienet_dma_bd_init(ndev)) {
488 netdev_err(ndev, "%s: descriptor allocation failed\n",
489 __func__);
490 }
491
492 axienet_status = axienet_ior(lp, XAE_RCW1_OFFSET);
493 axienet_status &= ~XAE_RCW1_RX_MASK;
494 axienet_iow(lp, XAE_RCW1_OFFSET, axienet_status);
495
496 axienet_status = axienet_ior(lp, XAE_IP_OFFSET);
497 if (axienet_status & XAE_INT_RXRJECT_MASK)
498 axienet_iow(lp, XAE_IS_OFFSET, XAE_INT_RXRJECT_MASK);
499
500 axienet_iow(lp, XAE_FCC_OFFSET, XAE_FCC_FCRX_MASK);
501
502 /* Sync default options with HW but leave receiver and
503 * transmitter disabled.
504 */
505 axienet_setoptions(ndev, lp->options &
506 ~(XAE_OPTION_TXEN | XAE_OPTION_RXEN));
507 axienet_set_mac_address(ndev, NULL);
508 axienet_set_multicast_list(ndev);
509 axienet_setoptions(ndev, lp->options);
510
511 ndev->trans_start = jiffies;
512}
513
514/**
515 * axienet_adjust_link - Adjust the PHY link speed/duplex.
516 * @ndev: Pointer to the net_device structure
517 *
518 * This function is called to change the speed and duplex setting after
519 * auto negotiation is done by the PHY. This is the function that gets
520 * registered with the PHY interface through the "of_phy_connect" call.
521 */
522static void axienet_adjust_link(struct net_device *ndev)
523{
524 u32 emmc_reg;
525 u32 link_state;
526 u32 setspeed = 1;
527 struct axienet_local *lp = netdev_priv(ndev);
528 struct phy_device *phy = lp->phy_dev;
529
530 link_state = phy->speed | (phy->duplex << 1) | phy->link;
531 if (lp->last_link != link_state) {
532 if ((phy->speed == SPEED_10) || (phy->speed == SPEED_100)) {
533 if (lp->phy_type == XAE_PHY_TYPE_1000BASE_X)
534 setspeed = 0;
535 } else {
536 if ((phy->speed == SPEED_1000) &&
537 (lp->phy_type == XAE_PHY_TYPE_MII))
538 setspeed = 0;
539 }
540
541 if (setspeed == 1) {
542 emmc_reg = axienet_ior(lp, XAE_EMMC_OFFSET);
543 emmc_reg &= ~XAE_EMMC_LINKSPEED_MASK;
544
545 switch (phy->speed) {
546 case SPEED_1000:
547 emmc_reg |= XAE_EMMC_LINKSPD_1000;
548 break;
549 case SPEED_100:
550 emmc_reg |= XAE_EMMC_LINKSPD_100;
551 break;
552 case SPEED_10:
553 emmc_reg |= XAE_EMMC_LINKSPD_10;
554 break;
555 default:
556 dev_err(&ndev->dev, "Speed other than 10, 100 "
557 "or 1Gbps is not supported\n");
558 break;
559 }
560
561 axienet_iow(lp, XAE_EMMC_OFFSET, emmc_reg);
562 lp->last_link = link_state;
563 phy_print_status(phy);
564 } else {
565 netdev_err(ndev,
566 "Error setting Axi Ethernet mac speed\n");
567 }
568 }
569}
570
571/**
572 * axienet_start_xmit_done - Invoked once a transmit is completed by the
573 * Axi DMA Tx channel.
574 * @ndev: Pointer to the net_device structure
575 *
576 * This function is invoked from the Axi DMA Tx isr to notify the completion
577 * of transmit operation. It clears fields in the corresponding Tx BDs and
578 * unmaps the corresponding buffer so that CPU can regain ownership of the
579 * buffer. It finally invokes "netif_wake_queue" to restart transmission if
580 * required.
581 */
582static void axienet_start_xmit_done(struct net_device *ndev)
583{
584 u32 size = 0;
585 u32 packets = 0;
586 struct axienet_local *lp = netdev_priv(ndev);
587 struct axidma_bd *cur_p;
588 unsigned int status = 0;
589
590 cur_p = &lp->tx_bd_v[lp->tx_bd_ci];
591 status = cur_p->status;
592 while (status & XAXIDMA_BD_STS_COMPLETE_MASK) {
593 dma_unmap_single(ndev->dev.parent, cur_p->phys,
594 (cur_p->cntrl & XAXIDMA_BD_CTRL_LENGTH_MASK),
595 DMA_TO_DEVICE);
596 if (cur_p->app4)
597 dev_kfree_skb_irq((struct sk_buff *)cur_p->app4);
598 /*cur_p->phys = 0;*/
599 cur_p->app0 = 0;
600 cur_p->app1 = 0;
601 cur_p->app2 = 0;
602 cur_p->app4 = 0;
603 cur_p->status = 0;
604
605 size += status & XAXIDMA_BD_STS_ACTUAL_LEN_MASK;
606 packets++;
607
608 ++lp->tx_bd_ci;
609 lp->tx_bd_ci %= TX_BD_NUM;
610 cur_p = &lp->tx_bd_v[lp->tx_bd_ci];
611 status = cur_p->status;
612 }
613
614 ndev->stats.tx_packets += packets;
615 ndev->stats.tx_bytes += size;
616 netif_wake_queue(ndev);
617}
618
619/**
620 * axienet_check_tx_bd_space - Checks if a BD/group of BDs are currently busy
621 * @lp: Pointer to the axienet_local structure
622 * @num_frag: The number of BDs to check for
623 *
624 * Return: 0, on success
625 * NETDEV_TX_BUSY, if any of the descriptors are not free
626 *
627 * This function is invoked before BDs are allocated and transmission starts.
628 * This function returns 0 if a BD or group of BDs can be allocated for
629 * transmission. If the BD or any of the BDs are not free the function
630 * returns a busy status. This is invoked from axienet_start_xmit.
631 */
632static inline int axienet_check_tx_bd_space(struct axienet_local *lp,
633 int num_frag)
634{
635 struct axidma_bd *cur_p;
636 cur_p = &lp->tx_bd_v[(lp->tx_bd_tail + num_frag) % TX_BD_NUM];
637 if (cur_p->status & XAXIDMA_BD_STS_ALL_MASK)
638 return NETDEV_TX_BUSY;
639 return 0;
640}
641
642/**
643 * axienet_start_xmit - Starts the transmission.
644 * @skb: sk_buff pointer that contains data to be Txed.
645 * @ndev: Pointer to net_device structure.
646 *
647 * Return: NETDEV_TX_OK, on success
648 * NETDEV_TX_BUSY, if any of the descriptors are not free
649 *
650 * This function is invoked from upper layers to initiate transmission. The
651 * function uses the next available free BDs and populates their fields to
652 * start the transmission. Additionally if checksum offloading is supported,
653 * it populates AXI Stream Control fields with appropriate values.
654 */
655static int axienet_start_xmit(struct sk_buff *skb, struct net_device *ndev)
656{
657 u32 ii;
658 u32 num_frag;
659 u32 csum_start_off;
660 u32 csum_index_off;
661 skb_frag_t *frag;
662 dma_addr_t tail_p;
663 struct axienet_local *lp = netdev_priv(ndev);
664 struct axidma_bd *cur_p;
665
666 num_frag = skb_shinfo(skb)->nr_frags;
667 cur_p = &lp->tx_bd_v[lp->tx_bd_tail];
668
669 if (axienet_check_tx_bd_space(lp, num_frag)) {
670 if (!netif_queue_stopped(ndev))
671 netif_stop_queue(ndev);
672 return NETDEV_TX_BUSY;
673 }
674
675 if (skb->ip_summed == CHECKSUM_PARTIAL) {
676 if (lp->features & XAE_FEATURE_FULL_TX_CSUM) {
677 /* Tx Full Checksum Offload Enabled */
678 cur_p->app0 |= 2;
679 } else if (lp->features & XAE_FEATURE_PARTIAL_RX_CSUM) {
680 csum_start_off = skb_transport_offset(skb);
681 csum_index_off = csum_start_off + skb->csum_offset;
682 /* Tx Partial Checksum Offload Enabled */
683 cur_p->app0 |= 1;
684 cur_p->app1 = (csum_start_off << 16) | csum_index_off;
685 }
686 } else if (skb->ip_summed == CHECKSUM_UNNECESSARY) {
687 cur_p->app0 |= 2; /* Tx Full Checksum Offload Enabled */
688 }
689
690 cur_p->cntrl = skb_headlen(skb) | XAXIDMA_BD_CTRL_TXSOF_MASK;
691 cur_p->phys = dma_map_single(ndev->dev.parent, skb->data,
692 skb_headlen(skb), DMA_TO_DEVICE);
693
694 for (ii = 0; ii < num_frag; ii++) {
695 ++lp->tx_bd_tail;
696 lp->tx_bd_tail %= TX_BD_NUM;
697 cur_p = &lp->tx_bd_v[lp->tx_bd_tail];
698 frag = &skb_shinfo(skb)->frags[ii];
699 cur_p->phys = dma_map_single(ndev->dev.parent,
700 skb_frag_address(frag),
701 skb_frag_size(frag),
702 DMA_TO_DEVICE);
703 cur_p->cntrl = skb_frag_size(frag);
704 }
705
706 cur_p->cntrl |= XAXIDMA_BD_CTRL_TXEOF_MASK;
707 cur_p->app4 = (unsigned long)skb;
708
709 tail_p = lp->tx_bd_p + sizeof(*lp->tx_bd_v) * lp->tx_bd_tail;
710 /* Start the transfer */
711 axienet_dma_out32(lp, XAXIDMA_TX_TDESC_OFFSET, tail_p);
712 ++lp->tx_bd_tail;
713 lp->tx_bd_tail %= TX_BD_NUM;
714
715 return NETDEV_TX_OK;
716}
717
718/**
719 * axienet_recv - Is called from Axi DMA Rx Isr to complete the received
720 * BD processing.
721 * @ndev: Pointer to net_device structure.
722 *
723 * This function is invoked from the Axi DMA Rx isr to process the Rx BDs. It
724 * does minimal processing and invokes "netif_rx" to complete further
725 * processing.
726 */
727static void axienet_recv(struct net_device *ndev)
728{
729 u32 length;
730 u32 csumstatus;
731 u32 size = 0;
732 u32 packets = 0;
733 dma_addr_t tail_p = 0;
734 struct axienet_local *lp = netdev_priv(ndev);
735 struct sk_buff *skb, *new_skb;
736 struct axidma_bd *cur_p;
737
738 cur_p = &lp->rx_bd_v[lp->rx_bd_ci];
739
740 while ((cur_p->status & XAXIDMA_BD_STS_COMPLETE_MASK)) {
741 tail_p = lp->rx_bd_p + sizeof(*lp->rx_bd_v) * lp->rx_bd_ci;
742 skb = (struct sk_buff *) (cur_p->sw_id_offset);
743 length = cur_p->app4 & 0x0000FFFF;
744
745 dma_unmap_single(ndev->dev.parent, cur_p->phys,
746 lp->max_frm_size,
747 DMA_FROM_DEVICE);
748
749 skb_put(skb, length);
750 skb->protocol = eth_type_trans(skb, ndev);
751 /*skb_checksum_none_assert(skb);*/
752 skb->ip_summed = CHECKSUM_NONE;
753
754 /* if we're doing Rx csum offload, set it up */
755 if (lp->features & XAE_FEATURE_FULL_RX_CSUM) {
756 csumstatus = (cur_p->app2 &
757 XAE_FULL_CSUM_STATUS_MASK) >> 3;
758 if ((csumstatus == XAE_IP_TCP_CSUM_VALIDATED) ||
759 (csumstatus == XAE_IP_UDP_CSUM_VALIDATED)) {
760 skb->ip_summed = CHECKSUM_UNNECESSARY;
761 }
762 } else if ((lp->features & XAE_FEATURE_PARTIAL_RX_CSUM) != 0 &&
763 skb->protocol == htons(ETH_P_IP) &&
764 skb->len > 64) {
765 skb->csum = be32_to_cpu(cur_p->app3 & 0xFFFF);
766 skb->ip_summed = CHECKSUM_COMPLETE;
767 }
768
769 netif_rx(skb);
770
771 size += length;
772 packets++;
773
774 new_skb = netdev_alloc_skb_ip_align(ndev, lp->max_frm_size);
775 if (!new_skb)
776 return;
777
778 cur_p->phys = dma_map_single(ndev->dev.parent, new_skb->data,
779 lp->max_frm_size,
780 DMA_FROM_DEVICE);
781 cur_p->cntrl = lp->max_frm_size;
782 cur_p->status = 0;
783 cur_p->sw_id_offset = (u32) new_skb;
784
785 ++lp->rx_bd_ci;
786 lp->rx_bd_ci %= RX_BD_NUM;
787 cur_p = &lp->rx_bd_v[lp->rx_bd_ci];
788 }
789
790 ndev->stats.rx_packets += packets;
791 ndev->stats.rx_bytes += size;
792
793 if (tail_p)
794 axienet_dma_out32(lp, XAXIDMA_RX_TDESC_OFFSET, tail_p);
795}
796
797/**
798 * axienet_tx_irq - Tx Done Isr.
799 * @irq: irq number
800 * @_ndev: net_device pointer
801 *
802 * Return: IRQ_HANDLED for all cases.
803 *
804 * This is the Axi DMA Tx done Isr. It invokes "axienet_start_xmit_done"
805 * to complete the BD processing.
806 */
807static irqreturn_t axienet_tx_irq(int irq, void *_ndev)
808{
809 u32 cr;
810 unsigned int status;
811 struct net_device *ndev = _ndev;
812 struct axienet_local *lp = netdev_priv(ndev);
813
814 status = axienet_dma_in32(lp, XAXIDMA_TX_SR_OFFSET);
815 if (status & (XAXIDMA_IRQ_IOC_MASK | XAXIDMA_IRQ_DELAY_MASK)) {
816 axienet_dma_out32(lp, XAXIDMA_TX_SR_OFFSET, status);
817 axienet_start_xmit_done(lp->ndev);
818 goto out;
819 }
820 if (!(status & XAXIDMA_IRQ_ALL_MASK))
821 dev_err(&ndev->dev, "No interrupts asserted in Tx path");
822 if (status & XAXIDMA_IRQ_ERROR_MASK) {
823 dev_err(&ndev->dev, "DMA Tx error 0x%x\n", status);
824 dev_err(&ndev->dev, "Current BD is at: 0x%x\n",
825 (lp->tx_bd_v[lp->tx_bd_ci]).phys);
826
827 cr = axienet_dma_in32(lp, XAXIDMA_TX_CR_OFFSET);
828 /* Disable coalesce, delay timer and error interrupts */
829 cr &= (~XAXIDMA_IRQ_ALL_MASK);
830 /* Write to the Tx channel control register */
831 axienet_dma_out32(lp, XAXIDMA_TX_CR_OFFSET, cr);
832
833 cr = axienet_dma_in32(lp, XAXIDMA_RX_CR_OFFSET);
834 /* Disable coalesce, delay timer and error interrupts */
835 cr &= (~XAXIDMA_IRQ_ALL_MASK);
836 /* Write to the Rx channel control register */
837 axienet_dma_out32(lp, XAXIDMA_RX_CR_OFFSET, cr);
838
839 tasklet_schedule(&lp->dma_err_tasklet);
840 axienet_dma_out32(lp, XAXIDMA_TX_SR_OFFSET, status);
841 }
842out:
843 return IRQ_HANDLED;
844}
845
846/**
847 * axienet_rx_irq - Rx Isr.
848 * @irq: irq number
849 * @_ndev: net_device pointer
850 *
851 * Return: IRQ_HANDLED for all cases.
852 *
853 * This is the Axi DMA Rx Isr. It invokes "axienet_recv" to complete the BD
854 * processing.
855 */
856static irqreturn_t axienet_rx_irq(int irq, void *_ndev)
857{
858 u32 cr;
859 unsigned int status;
860 struct net_device *ndev = _ndev;
861 struct axienet_local *lp = netdev_priv(ndev);
862
863 status = axienet_dma_in32(lp, XAXIDMA_RX_SR_OFFSET);
864 if (status & (XAXIDMA_IRQ_IOC_MASK | XAXIDMA_IRQ_DELAY_MASK)) {
865 axienet_dma_out32(lp, XAXIDMA_RX_SR_OFFSET, status);
866 axienet_recv(lp->ndev);
867 goto out;
868 }
869 if (!(status & XAXIDMA_IRQ_ALL_MASK))
870 dev_err(&ndev->dev, "No interrupts asserted in Rx path");
871 if (status & XAXIDMA_IRQ_ERROR_MASK) {
872 dev_err(&ndev->dev, "DMA Rx error 0x%x\n", status);
873 dev_err(&ndev->dev, "Current BD is at: 0x%x\n",
874 (lp->rx_bd_v[lp->rx_bd_ci]).phys);
875
876 cr = axienet_dma_in32(lp, XAXIDMA_TX_CR_OFFSET);
877 /* Disable coalesce, delay timer and error interrupts */
878 cr &= (~XAXIDMA_IRQ_ALL_MASK);
879 /* Finally write to the Tx channel control register */
880 axienet_dma_out32(lp, XAXIDMA_TX_CR_OFFSET, cr);
881
882 cr = axienet_dma_in32(lp, XAXIDMA_RX_CR_OFFSET);
883 /* Disable coalesce, delay timer and error interrupts */
884 cr &= (~XAXIDMA_IRQ_ALL_MASK);
885 /* write to the Rx channel control register */
886 axienet_dma_out32(lp, XAXIDMA_RX_CR_OFFSET, cr);
887
888 tasklet_schedule(&lp->dma_err_tasklet);
889 axienet_dma_out32(lp, XAXIDMA_RX_SR_OFFSET, status);
890 }
891out:
892 return IRQ_HANDLED;
893}
894
895static void axienet_dma_err_handler(unsigned long data);
896
897/**
898 * axienet_open - Driver open routine.
899 * @ndev: Pointer to net_device structure
900 *
901 * Return: 0, on success.
902 * -ENODEV, if PHY cannot be connected to
903 * non-zero error value on failure
904 *
905 * This is the driver open routine. It calls phy_start to start the PHY device.
906 * It also allocates interrupt service routines, enables the interrupt lines
907 * and ISR handling. Axi Ethernet core is reset through Axi DMA core. Buffer
908 * descriptors are initialized.
909 */
910static int axienet_open(struct net_device *ndev)
911{
912 int ret, mdio_mcreg;
913 struct axienet_local *lp = netdev_priv(ndev);
914
915 dev_dbg(&ndev->dev, "axienet_open()\n");
916
917 mdio_mcreg = axienet_ior(lp, XAE_MDIO_MC_OFFSET);
918 ret = axienet_mdio_wait_until_ready(lp);
919 if (ret < 0)
920 return ret;
921 /* Disable the MDIO interface till Axi Ethernet Reset is completed.
922 * When we do an Axi Ethernet reset, it resets the complete core
923 * including the MDIO. If MDIO is not disabled when the reset
924 * process is started, MDIO will be broken afterwards.
925 */
926 axienet_iow(lp, XAE_MDIO_MC_OFFSET,
927 (mdio_mcreg & (~XAE_MDIO_MC_MDIOEN_MASK)));
928 axienet_device_reset(ndev);
929 /* Enable the MDIO */
930 axienet_iow(lp, XAE_MDIO_MC_OFFSET, mdio_mcreg);
931 ret = axienet_mdio_wait_until_ready(lp);
932 if (ret < 0)
933 return ret;
934
935 if (lp->phy_node) {
936 if (lp->phy_type == XAE_PHY_TYPE_GMII) {
937 lp->phy_dev = of_phy_connect(lp->ndev, lp->phy_node,
938 axienet_adjust_link, 0,
939 PHY_INTERFACE_MODE_GMII);
940 } else if (lp->phy_type == XAE_PHY_TYPE_RGMII_2_0) {
941 lp->phy_dev = of_phy_connect(lp->ndev, lp->phy_node,
942 axienet_adjust_link, 0,
943 PHY_INTERFACE_MODE_RGMII_ID);
944 }
945
946 if (!lp->phy_dev)
947 dev_err(lp->dev, "of_phy_connect() failed\n");
948 else
949 phy_start(lp->phy_dev);
950 }
951
952 /* Enable tasklets for Axi DMA error handling */
953 tasklet_init(&lp->dma_err_tasklet, axienet_dma_err_handler,
954 (unsigned long) lp);
955
956 /* Enable interrupts for Axi DMA Tx */
957 ret = request_irq(lp->tx_irq, axienet_tx_irq, 0, ndev->name, ndev);
958 if (ret)
959 goto err_tx_irq;
960 /* Enable interrupts for Axi DMA Rx */
961 ret = request_irq(lp->rx_irq, axienet_rx_irq, 0, ndev->name, ndev);
962 if (ret)
963 goto err_rx_irq;
964
965 return 0;
966
967err_rx_irq:
968 free_irq(lp->tx_irq, ndev);
969err_tx_irq:
970 if (lp->phy_dev)
971 phy_disconnect(lp->phy_dev);
972 lp->phy_dev = NULL;
973 tasklet_kill(&lp->dma_err_tasklet);
974 dev_err(lp->dev, "request_irq() failed\n");
975 return ret;
976}
977
978/**
979 * axienet_stop - Driver stop routine.
980 * @ndev: Pointer to net_device structure
981 *
982 * Return: 0, on success.
983 *
984 * This is the driver stop routine. It calls phy_disconnect to stop the PHY
985 * device. It also removes the interrupt handlers and disables the interrupts.
986 * The Axi DMA Tx/Rx BDs are released.
987 */
988static int axienet_stop(struct net_device *ndev)
989{
990 u32 cr;
991 struct axienet_local *lp = netdev_priv(ndev);
992
993 dev_dbg(&ndev->dev, "axienet_close()\n");
994
995 cr = axienet_dma_in32(lp, XAXIDMA_RX_CR_OFFSET);
996 axienet_dma_out32(lp, XAXIDMA_RX_CR_OFFSET,
997 cr & (~XAXIDMA_CR_RUNSTOP_MASK));
998 cr = axienet_dma_in32(lp, XAXIDMA_TX_CR_OFFSET);
999 axienet_dma_out32(lp, XAXIDMA_TX_CR_OFFSET,
1000 cr & (~XAXIDMA_CR_RUNSTOP_MASK));
1001 axienet_setoptions(ndev, lp->options &
1002 ~(XAE_OPTION_TXEN | XAE_OPTION_RXEN));
1003
1004 tasklet_kill(&lp->dma_err_tasklet);
1005
1006 free_irq(lp->tx_irq, ndev);
1007 free_irq(lp->rx_irq, ndev);
1008
1009 if (lp->phy_dev)
1010 phy_disconnect(lp->phy_dev);
1011 lp->phy_dev = NULL;
1012
1013 axienet_dma_bd_release(ndev);
1014 return 0;
1015}
1016
1017/**
1018 * axienet_change_mtu - Driver change mtu routine.
1019 * @ndev: Pointer to net_device structure
1020 * @new_mtu: New mtu value to be applied
1021 *
1022 * Return: Always returns 0 (success).
1023 *
1024 * This is the change mtu driver routine. It checks if the Axi Ethernet
1025 * hardware supports jumbo frames before changing the mtu. This can be
1026 * called only when the device is not up.
1027 */
1028static int axienet_change_mtu(struct net_device *ndev, int new_mtu)
1029{
1030 struct axienet_local *lp = netdev_priv(ndev);
1031
1032 if (netif_running(ndev))
1033 return -EBUSY;
1034
1035 if ((new_mtu + VLAN_ETH_HLEN +
1036 XAE_TRL_SIZE) > lp->rxmem)
1037 return -EINVAL;
1038
1039 if ((new_mtu > XAE_JUMBO_MTU) || (new_mtu < 64))
1040 return -EINVAL;
1041
1042 ndev->mtu = new_mtu;
1043
1044 return 0;
1045}
1046
1047#ifdef CONFIG_NET_POLL_CONTROLLER
1048/**
1049 * axienet_poll_controller - Axi Ethernet poll mechanism.
1050 * @ndev: Pointer to net_device structure
1051 *
1052 * This implements Rx/Tx ISR poll mechanisms. The interrupts are disabled prior
1053 * to polling the ISRs and are enabled back after the polling is done.
1054 */
1055static void axienet_poll_controller(struct net_device *ndev)
1056{
1057 struct axienet_local *lp = netdev_priv(ndev);
1058 disable_irq(lp->tx_irq);
1059 disable_irq(lp->rx_irq);
1060 axienet_rx_irq(lp->tx_irq, ndev);
1061 axienet_tx_irq(lp->rx_irq, ndev);
1062 enable_irq(lp->tx_irq);
1063 enable_irq(lp->rx_irq);
1064}
1065#endif
1066
1067static const struct net_device_ops axienet_netdev_ops = {
1068 .ndo_open = axienet_open,
1069 .ndo_stop = axienet_stop,
1070 .ndo_start_xmit = axienet_start_xmit,
1071 .ndo_change_mtu = axienet_change_mtu,
1072 .ndo_set_mac_address = netdev_set_mac_address,
1073 .ndo_validate_addr = eth_validate_addr,
1074 .ndo_set_rx_mode = axienet_set_multicast_list,
1075#ifdef CONFIG_NET_POLL_CONTROLLER
1076 .ndo_poll_controller = axienet_poll_controller,
1077#endif
1078};
1079
1080/**
1081 * axienet_ethtools_get_settings - Get Axi Ethernet settings related to PHY.
1082 * @ndev: Pointer to net_device structure
1083 * @ecmd: Pointer to ethtool_cmd structure
1084 *
1085 * This implements ethtool command for getting PHY settings. If PHY could
1086 * not be found, the function returns -ENODEV. This function calls the
1087 * relevant PHY ethtool API to get the PHY settings.
1088 * Issue "ethtool ethX" under linux prompt to execute this function.
1089 *
1090 * Return: 0 on success, -ENODEV if PHY doesn't exist
1091 */
1092static int axienet_ethtools_get_settings(struct net_device *ndev,
1093 struct ethtool_cmd *ecmd)
1094{
1095 struct axienet_local *lp = netdev_priv(ndev);
1096 struct phy_device *phydev = lp->phy_dev;
1097 if (!phydev)
1098 return -ENODEV;
1099 return phy_ethtool_gset(phydev, ecmd);
1100}
1101
1102/**
1103 * axienet_ethtools_set_settings - Set PHY settings as passed in the argument.
1104 * @ndev: Pointer to net_device structure
1105 * @ecmd: Pointer to ethtool_cmd structure
1106 *
1107 * This implements ethtool command for setting various PHY settings. If PHY
1108 * could not be found, the function returns -ENODEV. This function calls the
1109 * relevant PHY ethtool API to set the PHY.
1110 * Issue e.g. "ethtool -s ethX speed 1000" under linux prompt to execute this
1111 * function.
1112 *
1113 * Return: 0 on success, -ENODEV if PHY doesn't exist
1114 */
1115static int axienet_ethtools_set_settings(struct net_device *ndev,
1116 struct ethtool_cmd *ecmd)
1117{
1118 struct axienet_local *lp = netdev_priv(ndev);
1119 struct phy_device *phydev = lp->phy_dev;
1120 if (!phydev)
1121 return -ENODEV;
1122 return phy_ethtool_sset(phydev, ecmd);
1123}
1124
1125/**
1126 * axienet_ethtools_get_drvinfo - Get various Axi Ethernet driver information.
1127 * @ndev: Pointer to net_device structure
1128 * @ed: Pointer to ethtool_drvinfo structure
1129 *
1130 * This implements ethtool command for getting the driver information.
1131 * Issue "ethtool -i ethX" under linux prompt to execute this function.
1132 */
1133static void axienet_ethtools_get_drvinfo(struct net_device *ndev,
1134 struct ethtool_drvinfo *ed)
1135{
1136 strlcpy(ed->driver, DRIVER_NAME, sizeof(ed->driver));
1137 strlcpy(ed->version, DRIVER_VERSION, sizeof(ed->version));
1138}
1139
1140/**
1141 * axienet_ethtools_get_regs_len - Get the total regs length present in the
1142 * AxiEthernet core.
1143 * @ndev: Pointer to net_device structure
1144 *
1145 * This implements ethtool command for getting the total register length
1146 * information.
1147 *
1148 * Return: the total regs length
1149 */
1150static int axienet_ethtools_get_regs_len(struct net_device *ndev)
1151{
1152 return sizeof(u32) * AXIENET_REGS_N;
1153}
1154
1155/**
1156 * axienet_ethtools_get_regs - Dump the contents of all registers present
1157 * in AxiEthernet core.
1158 * @ndev: Pointer to net_device structure
1159 * @regs: Pointer to ethtool_regs structure
1160 * @ret: Void pointer used to return the contents of the registers.
1161 *
1162 * This implements ethtool command for getting the Axi Ethernet register dump.
1163 * Issue "ethtool -d ethX" to execute this function.
1164 */
1165static void axienet_ethtools_get_regs(struct net_device *ndev,
1166 struct ethtool_regs *regs, void *ret)
1167{
1168 u32 *data = (u32 *) ret;
1169 size_t len = sizeof(u32) * AXIENET_REGS_N;
1170 struct axienet_local *lp = netdev_priv(ndev);
1171
1172 regs->version = 0;
1173 regs->len = len;
1174
1175 memset(data, 0, len);
1176 data[0] = axienet_ior(lp, XAE_RAF_OFFSET);
1177 data[1] = axienet_ior(lp, XAE_TPF_OFFSET);
1178 data[2] = axienet_ior(lp, XAE_IFGP_OFFSET);
1179 data[3] = axienet_ior(lp, XAE_IS_OFFSET);
1180 data[4] = axienet_ior(lp, XAE_IP_OFFSET);
1181 data[5] = axienet_ior(lp, XAE_IE_OFFSET);
1182 data[6] = axienet_ior(lp, XAE_TTAG_OFFSET);
1183 data[7] = axienet_ior(lp, XAE_RTAG_OFFSET);
1184 data[8] = axienet_ior(lp, XAE_UAWL_OFFSET);
1185 data[9] = axienet_ior(lp, XAE_UAWU_OFFSET);
1186 data[10] = axienet_ior(lp, XAE_TPID0_OFFSET);
1187 data[11] = axienet_ior(lp, XAE_TPID1_OFFSET);
1188 data[12] = axienet_ior(lp, XAE_PPST_OFFSET);
1189 data[13] = axienet_ior(lp, XAE_RCW0_OFFSET);
1190 data[14] = axienet_ior(lp, XAE_RCW1_OFFSET);
1191 data[15] = axienet_ior(lp, XAE_TC_OFFSET);
1192 data[16] = axienet_ior(lp, XAE_FCC_OFFSET);
1193 data[17] = axienet_ior(lp, XAE_EMMC_OFFSET);
1194 data[18] = axienet_ior(lp, XAE_PHYC_OFFSET);
1195 data[19] = axienet_ior(lp, XAE_MDIO_MC_OFFSET);
1196 data[20] = axienet_ior(lp, XAE_MDIO_MCR_OFFSET);
1197 data[21] = axienet_ior(lp, XAE_MDIO_MWD_OFFSET);
1198 data[22] = axienet_ior(lp, XAE_MDIO_MRD_OFFSET);
1199 data[23] = axienet_ior(lp, XAE_MDIO_MIS_OFFSET);
1200 data[24] = axienet_ior(lp, XAE_MDIO_MIP_OFFSET);
1201 data[25] = axienet_ior(lp, XAE_MDIO_MIE_OFFSET);
1202 data[26] = axienet_ior(lp, XAE_MDIO_MIC_OFFSET);
1203 data[27] = axienet_ior(lp, XAE_UAW0_OFFSET);
1204 data[28] = axienet_ior(lp, XAE_UAW1_OFFSET);
1205 data[29] = axienet_ior(lp, XAE_FMI_OFFSET);
1206 data[30] = axienet_ior(lp, XAE_AF0_OFFSET);
1207 data[31] = axienet_ior(lp, XAE_AF1_OFFSET);
1208}
1209
1210/**
1211 * axienet_ethtools_get_pauseparam - Get the pause parameter setting for
1212 * Tx and Rx paths.
1213 * @ndev: Pointer to net_device structure
1214 * @epauseparm: Pointer to ethtool_pauseparam structure.
1215 *
1216 * This implements ethtool command for getting axi ethernet pause frame
1217 * setting. Issue "ethtool -a ethX" to execute this function.
1218 */
1219static void
1220axienet_ethtools_get_pauseparam(struct net_device *ndev,
1221 struct ethtool_pauseparam *epauseparm)
1222{
1223 u32 regval;
1224 struct axienet_local *lp = netdev_priv(ndev);
1225 epauseparm->autoneg = 0;
1226 regval = axienet_ior(lp, XAE_FCC_OFFSET);
1227 epauseparm->tx_pause = regval & XAE_FCC_FCTX_MASK;
1228 epauseparm->rx_pause = regval & XAE_FCC_FCRX_MASK;
1229}
1230
1231/**
1232 * axienet_ethtools_set_pauseparam - Set device pause parameter(flow control)
1233 * settings.
1234 * @ndev: Pointer to net_device structure
1235 * @epauseparm:Pointer to ethtool_pauseparam structure
1236 *
1237 * This implements ethtool command for enabling flow control on Rx and Tx
1238 * paths. Issue "ethtool -A ethX tx on|off" under linux prompt to execute this
1239 * function.
1240 *
1241 * Return: 0 on success, -EFAULT if device is running
1242 */
1243static int
1244axienet_ethtools_set_pauseparam(struct net_device *ndev,
1245 struct ethtool_pauseparam *epauseparm)
1246{
1247 u32 regval = 0;
1248 struct axienet_local *lp = netdev_priv(ndev);
1249
1250 if (netif_running(ndev)) {
1251 netdev_err(ndev,
1252 "Please stop netif before applying configuration\n");
1253 return -EFAULT;
1254 }
1255
1256 regval = axienet_ior(lp, XAE_FCC_OFFSET);
1257 if (epauseparm->tx_pause)
1258 regval |= XAE_FCC_FCTX_MASK;
1259 else
1260 regval &= ~XAE_FCC_FCTX_MASK;
1261 if (epauseparm->rx_pause)
1262 regval |= XAE_FCC_FCRX_MASK;
1263 else
1264 regval &= ~XAE_FCC_FCRX_MASK;
1265 axienet_iow(lp, XAE_FCC_OFFSET, regval);
1266
1267 return 0;
1268}
1269
1270/**
1271 * axienet_ethtools_get_coalesce - Get DMA interrupt coalescing count.
1272 * @ndev: Pointer to net_device structure
1273 * @ecoalesce: Pointer to ethtool_coalesce structure
1274 *
1275 * This implements ethtool command for getting the DMA interrupt coalescing
1276 * count on Tx and Rx paths. Issue "ethtool -c ethX" under linux prompt to
1277 * execute this function.
1278 *
1279 * Return: 0 always
1280 */
1281static int axienet_ethtools_get_coalesce(struct net_device *ndev,
1282 struct ethtool_coalesce *ecoalesce)
1283{
1284 u32 regval = 0;
1285 struct axienet_local *lp = netdev_priv(ndev);
1286 regval = axienet_dma_in32(lp, XAXIDMA_RX_CR_OFFSET);
1287 ecoalesce->rx_max_coalesced_frames = (regval & XAXIDMA_COALESCE_MASK)
1288 >> XAXIDMA_COALESCE_SHIFT;
1289 regval = axienet_dma_in32(lp, XAXIDMA_TX_CR_OFFSET);
1290 ecoalesce->tx_max_coalesced_frames = (regval & XAXIDMA_COALESCE_MASK)
1291 >> XAXIDMA_COALESCE_SHIFT;
1292 return 0;
1293}
1294
1295/**
1296 * axienet_ethtools_set_coalesce - Set DMA interrupt coalescing count.
1297 * @ndev: Pointer to net_device structure
1298 * @ecoalesce: Pointer to ethtool_coalesce structure
1299 *
1300 * This implements ethtool command for setting the DMA interrupt coalescing
1301 * count on Tx and Rx paths. Issue "ethtool -C ethX rx-frames 5" under linux
1302 * prompt to execute this function.
1303 *
1304 * Return: 0, on success, Non-zero error value on failure.
1305 */
1306static int axienet_ethtools_set_coalesce(struct net_device *ndev,
1307 struct ethtool_coalesce *ecoalesce)
1308{
1309 struct axienet_local *lp = netdev_priv(ndev);
1310
1311 if (netif_running(ndev)) {
1312 netdev_err(ndev,
1313 "Please stop netif before applying configuration\n");
1314 return -EFAULT;
1315 }
1316
1317 if ((ecoalesce->rx_coalesce_usecs) ||
1318 (ecoalesce->rx_coalesce_usecs_irq) ||
1319 (ecoalesce->rx_max_coalesced_frames_irq) ||
1320 (ecoalesce->tx_coalesce_usecs) ||
1321 (ecoalesce->tx_coalesce_usecs_irq) ||
1322 (ecoalesce->tx_max_coalesced_frames_irq) ||
1323 (ecoalesce->stats_block_coalesce_usecs) ||
1324 (ecoalesce->use_adaptive_rx_coalesce) ||
1325 (ecoalesce->use_adaptive_tx_coalesce) ||
1326 (ecoalesce->pkt_rate_low) ||
1327 (ecoalesce->rx_coalesce_usecs_low) ||
1328 (ecoalesce->rx_max_coalesced_frames_low) ||
1329 (ecoalesce->tx_coalesce_usecs_low) ||
1330 (ecoalesce->tx_max_coalesced_frames_low) ||
1331 (ecoalesce->pkt_rate_high) ||
1332 (ecoalesce->rx_coalesce_usecs_high) ||
1333 (ecoalesce->rx_max_coalesced_frames_high) ||
1334 (ecoalesce->tx_coalesce_usecs_high) ||
1335 (ecoalesce->tx_max_coalesced_frames_high) ||
1336 (ecoalesce->rate_sample_interval))
1337 return -EOPNOTSUPP;
1338 if (ecoalesce->rx_max_coalesced_frames)
1339 lp->coalesce_count_rx = ecoalesce->rx_max_coalesced_frames;
1340 if (ecoalesce->tx_max_coalesced_frames)
1341 lp->coalesce_count_tx = ecoalesce->tx_max_coalesced_frames;
1342
1343 return 0;
1344}
1345
1346static struct ethtool_ops axienet_ethtool_ops = {
1347 .get_settings = axienet_ethtools_get_settings,
1348 .set_settings = axienet_ethtools_set_settings,
1349 .get_drvinfo = axienet_ethtools_get_drvinfo,
1350 .get_regs_len = axienet_ethtools_get_regs_len,
1351 .get_regs = axienet_ethtools_get_regs,
1352 .get_link = ethtool_op_get_link,
1353 .get_pauseparam = axienet_ethtools_get_pauseparam,
1354 .set_pauseparam = axienet_ethtools_set_pauseparam,
1355 .get_coalesce = axienet_ethtools_get_coalesce,
1356 .set_coalesce = axienet_ethtools_set_coalesce,
1357};
1358
1359/**
1360 * axienet_dma_err_handler - Tasklet handler for Axi DMA Error
1361 * @data: Data passed
1362 *
1363 * Resets the Axi DMA and Axi Ethernet devices, and reconfigures the
1364 * Tx/Rx BDs.
1365 */
1366static void axienet_dma_err_handler(unsigned long data)
1367{
1368 u32 axienet_status;
1369 u32 cr, i;
1370 int mdio_mcreg;
1371 struct axienet_local *lp = (struct axienet_local *) data;
1372 struct net_device *ndev = lp->ndev;
1373 struct axidma_bd *cur_p;
1374
1375 axienet_setoptions(ndev, lp->options &
1376 ~(XAE_OPTION_TXEN | XAE_OPTION_RXEN));
1377 mdio_mcreg = axienet_ior(lp, XAE_MDIO_MC_OFFSET);
1378 axienet_mdio_wait_until_ready(lp);
1379 /* Disable the MDIO interface till Axi Ethernet Reset is completed.
1380 * When we do an Axi Ethernet reset, it resets the complete core
1381 * including the MDIO. So if MDIO is not disabled when the reset
1382 * process is started, MDIO will be broken afterwards.
1383 */
1384 axienet_iow(lp, XAE_MDIO_MC_OFFSET, (mdio_mcreg &
1385 ~XAE_MDIO_MC_MDIOEN_MASK));
1386
1387 __axienet_device_reset(lp, &ndev->dev, XAXIDMA_TX_CR_OFFSET);
1388 __axienet_device_reset(lp, &ndev->dev, XAXIDMA_RX_CR_OFFSET);
1389
1390 axienet_iow(lp, XAE_MDIO_MC_OFFSET, mdio_mcreg);
1391 axienet_mdio_wait_until_ready(lp);
1392
1393 for (i = 0; i < TX_BD_NUM; i++) {
1394 cur_p = &lp->tx_bd_v[i];
1395 if (cur_p->phys)
1396 dma_unmap_single(ndev->dev.parent, cur_p->phys,
1397 (cur_p->cntrl &
1398 XAXIDMA_BD_CTRL_LENGTH_MASK),
1399 DMA_TO_DEVICE);
1400 if (cur_p->app4)
1401 dev_kfree_skb_irq((struct sk_buff *) cur_p->app4);
1402 cur_p->phys = 0;
1403 cur_p->cntrl = 0;
1404 cur_p->status = 0;
1405 cur_p->app0 = 0;
1406 cur_p->app1 = 0;
1407 cur_p->app2 = 0;
1408 cur_p->app3 = 0;
1409 cur_p->app4 = 0;
1410 cur_p->sw_id_offset = 0;
1411 }
1412
1413 for (i = 0; i < RX_BD_NUM; i++) {
1414 cur_p = &lp->rx_bd_v[i];
1415 cur_p->status = 0;
1416 cur_p->app0 = 0;
1417 cur_p->app1 = 0;
1418 cur_p->app2 = 0;
1419 cur_p->app3 = 0;
1420 cur_p->app4 = 0;
1421 }
1422
1423 lp->tx_bd_ci = 0;
1424 lp->tx_bd_tail = 0;
1425 lp->rx_bd_ci = 0;
1426
1427 /* Start updating the Rx channel control register */
1428 cr = axienet_dma_in32(lp, XAXIDMA_RX_CR_OFFSET);
1429 /* Update the interrupt coalesce count */
1430 cr = ((cr & ~XAXIDMA_COALESCE_MASK) |
1431 (XAXIDMA_DFT_RX_THRESHOLD << XAXIDMA_COALESCE_SHIFT));
1432 /* Update the delay timer count */
1433 cr = ((cr & ~XAXIDMA_DELAY_MASK) |
1434 (XAXIDMA_DFT_RX_WAITBOUND << XAXIDMA_DELAY_SHIFT));
1435 /* Enable coalesce, delay timer and error interrupts */
1436 cr |= XAXIDMA_IRQ_ALL_MASK;
1437 /* Finally write to the Rx channel control register */
1438 axienet_dma_out32(lp, XAXIDMA_RX_CR_OFFSET, cr);
1439
1440 /* Start updating the Tx channel control register */
1441 cr = axienet_dma_in32(lp, XAXIDMA_TX_CR_OFFSET);
1442 /* Update the interrupt coalesce count */
1443 cr = (((cr & ~XAXIDMA_COALESCE_MASK)) |
1444 (XAXIDMA_DFT_TX_THRESHOLD << XAXIDMA_COALESCE_SHIFT));
1445 /* Update the delay timer count */
1446 cr = (((cr & ~XAXIDMA_DELAY_MASK)) |
1447 (XAXIDMA_DFT_TX_WAITBOUND << XAXIDMA_DELAY_SHIFT));
1448 /* Enable coalesce, delay timer and error interrupts */
1449 cr |= XAXIDMA_IRQ_ALL_MASK;
1450 /* Finally write to the Tx channel control register */
1451 axienet_dma_out32(lp, XAXIDMA_TX_CR_OFFSET, cr);
1452
1453 /* Populate the tail pointer and bring the Rx Axi DMA engine out of
1454 * halted state. This will make the Rx side ready for reception.
1455 */
1456 axienet_dma_out32(lp, XAXIDMA_RX_CDESC_OFFSET, lp->rx_bd_p);
1457 cr = axienet_dma_in32(lp, XAXIDMA_RX_CR_OFFSET);
1458 axienet_dma_out32(lp, XAXIDMA_RX_CR_OFFSET,
1459 cr | XAXIDMA_CR_RUNSTOP_MASK);
1460 axienet_dma_out32(lp, XAXIDMA_RX_TDESC_OFFSET, lp->rx_bd_p +
1461 (sizeof(*lp->rx_bd_v) * (RX_BD_NUM - 1)));
1462
1463 /* Write to the RS (Run-stop) bit in the Tx channel control register.
1464 * Tx channel is now ready to run. But only after we write to the
1465 * tail pointer register that the Tx channel will start transmitting
1466 */
1467 axienet_dma_out32(lp, XAXIDMA_TX_CDESC_OFFSET, lp->tx_bd_p);
1468 cr = axienet_dma_in32(lp, XAXIDMA_TX_CR_OFFSET);
1469 axienet_dma_out32(lp, XAXIDMA_TX_CR_OFFSET,
1470 cr | XAXIDMA_CR_RUNSTOP_MASK);
1471
1472 axienet_status = axienet_ior(lp, XAE_RCW1_OFFSET);
1473 axienet_status &= ~XAE_RCW1_RX_MASK;
1474 axienet_iow(lp, XAE_RCW1_OFFSET, axienet_status);
1475
1476 axienet_status = axienet_ior(lp, XAE_IP_OFFSET);
1477 if (axienet_status & XAE_INT_RXRJECT_MASK)
1478 axienet_iow(lp, XAE_IS_OFFSET, XAE_INT_RXRJECT_MASK);
1479 axienet_iow(lp, XAE_FCC_OFFSET, XAE_FCC_FCRX_MASK);
1480
1481 /* Sync default options with HW but leave receiver and
1482 * transmitter disabled.
1483 */
1484 axienet_setoptions(ndev, lp->options &
1485 ~(XAE_OPTION_TXEN | XAE_OPTION_RXEN));
1486 axienet_set_mac_address(ndev, NULL);
1487 axienet_set_multicast_list(ndev);
1488 axienet_setoptions(ndev, lp->options);
1489}
1490
1491/**
1492 * axienet_probe - Axi Ethernet probe function.
1493 * @pdev: Pointer to platform device structure.
1494 *
1495 * Return: 0, on success
1496 * Non-zero error value on failure.
1497 *
1498 * This is the probe routine for Axi Ethernet driver. This is called before
1499 * any other driver routines are invoked. It allocates and sets up the Ethernet
1500 * device. Parses through device tree and populates fields of
1501 * axienet_local. It registers the Ethernet device.
1502 */
1503static int axienet_probe(struct platform_device *pdev)
1504{
1505 int ret;
1506 struct device_node *np;
1507 struct axienet_local *lp;
1508 struct net_device *ndev;
1509 u8 mac_addr[6];
1510 struct resource *ethres, dmares;
1511 u32 value;
1512
1513 ndev = alloc_etherdev(sizeof(*lp));
1514 if (!ndev)
1515 return -ENOMEM;
1516
1517 platform_set_drvdata(pdev, ndev);
1518
1519 SET_NETDEV_DEV(ndev, &pdev->dev);
1520 ndev->flags &= ~IFF_MULTICAST; /* clear multicast */
1521 ndev->features = NETIF_F_SG;
1522 ndev->netdev_ops = &axienet_netdev_ops;
1523 ndev->ethtool_ops = &axienet_ethtool_ops;
1524
1525 lp = netdev_priv(ndev);
1526 lp->ndev = ndev;
1527 lp->dev = &pdev->dev;
1528 lp->options = XAE_OPTION_DEFAULTS;
1529 /* Map device registers */
1530 ethres = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1531 lp->regs = devm_ioremap_resource(&pdev->dev, ethres);
1532 if (IS_ERR(lp->regs)) {
1533 dev_err(&pdev->dev, "could not map Axi Ethernet regs.\n");
1534 ret = PTR_ERR(lp->regs);
1535 goto free_netdev;
1536 }
1537
1538 /* Setup checksum offload, but default to off if not specified */
1539 lp->features = 0;
1540
1541 ret = of_property_read_u32(pdev->dev.of_node, "xlnx,txcsum", &value);
1542 if (!ret) {
1543 switch (value) {
1544 case 1:
1545 lp->csum_offload_on_tx_path =
1546 XAE_FEATURE_PARTIAL_TX_CSUM;
1547 lp->features |= XAE_FEATURE_PARTIAL_TX_CSUM;
1548 /* Can checksum TCP/UDP over IPv4. */
1549 ndev->features |= NETIF_F_IP_CSUM;
1550 break;
1551 case 2:
1552 lp->csum_offload_on_tx_path =
1553 XAE_FEATURE_FULL_TX_CSUM;
1554 lp->features |= XAE_FEATURE_FULL_TX_CSUM;
1555 /* Can checksum TCP/UDP over IPv4. */
1556 ndev->features |= NETIF_F_IP_CSUM;
1557 break;
1558 default:
1559 lp->csum_offload_on_tx_path = XAE_NO_CSUM_OFFLOAD;
1560 }
1561 }
1562 ret = of_property_read_u32(pdev->dev.of_node, "xlnx,rxcsum", &value);
1563 if (!ret) {
1564 switch (value) {
1565 case 1:
1566 lp->csum_offload_on_rx_path =
1567 XAE_FEATURE_PARTIAL_RX_CSUM;
1568 lp->features |= XAE_FEATURE_PARTIAL_RX_CSUM;
1569 break;
1570 case 2:
1571 lp->csum_offload_on_rx_path =
1572 XAE_FEATURE_FULL_RX_CSUM;
1573 lp->features |= XAE_FEATURE_FULL_RX_CSUM;
1574 break;
1575 default:
1576 lp->csum_offload_on_rx_path = XAE_NO_CSUM_OFFLOAD;
1577 }
1578 }
1579 /* For supporting jumbo frames, the Axi Ethernet hardware must have
1580 * a larger Rx/Tx Memory. Typically, the size must be large so that
1581 * we can enable jumbo option and start supporting jumbo frames.
1582 * Here we check for memory allocated for Rx/Tx in the hardware from
1583 * the device-tree and accordingly set flags.
1584 */
1585 of_property_read_u32(pdev->dev.of_node, "xlnx,rxmem", &lp->rxmem);
1586 of_property_read_u32(pdev->dev.of_node, "xlnx,phy-type", &lp->phy_type);
1587
1588 /* Find the DMA node, map the DMA registers, and decode the DMA IRQs */
1589 np = of_parse_phandle(pdev->dev.of_node, "axistream-connected", 0);
1590 if (IS_ERR(np)) {
1591 dev_err(&pdev->dev, "could not find DMA node\n");
1592 ret = PTR_ERR(np);
1593 goto free_netdev;
1594 }
1595 ret = of_address_to_resource(np, 0, &dmares);
1596 if (ret) {
1597 dev_err(&pdev->dev, "unable to get DMA resource\n");
1598 goto free_netdev;
1599 }
1600 lp->dma_regs = devm_ioremap_resource(&pdev->dev, &dmares);
1601 if (IS_ERR(lp->dma_regs)) {
1602 dev_err(&pdev->dev, "could not map DMA regs\n");
1603 ret = PTR_ERR(lp->dma_regs);
1604 goto free_netdev;
1605 }
1606 lp->rx_irq = irq_of_parse_and_map(np, 1);
1607 lp->tx_irq = irq_of_parse_and_map(np, 0);
1608 of_node_put(np);
1609 if ((lp->rx_irq <= 0) || (lp->tx_irq <= 0)) {
1610 dev_err(&pdev->dev, "could not determine irqs\n");
1611 ret = -ENOMEM;
1612 goto free_netdev;
1613 }
1614
1615 /* Retrieve the MAC address */
1616 ret = of_property_read_u8_array(pdev->dev.of_node,
1617 "local-mac-address", mac_addr, 6);
1618 if (ret) {
1619 dev_err(&pdev->dev, "could not find MAC address\n");
1620 goto free_netdev;
1621 }
1622 axienet_set_mac_address(ndev, (void *)mac_addr);
1623
1624 lp->coalesce_count_rx = XAXIDMA_DFT_RX_THRESHOLD;
1625 lp->coalesce_count_tx = XAXIDMA_DFT_TX_THRESHOLD;
1626
1627 lp->phy_node = of_parse_phandle(pdev->dev.of_node, "phy-handle", 0);
1628 if (lp->phy_node) {
1629 ret = axienet_mdio_setup(lp, pdev->dev.of_node);
1630 if (ret)
1631 dev_warn(&pdev->dev, "error registering MDIO bus\n");
1632 }
1633
1634 ret = register_netdev(lp->ndev);
1635 if (ret) {
1636 dev_err(lp->dev, "register_netdev() error (%i)\n", ret);
1637 goto free_netdev;
1638 }
1639
1640 return 0;
1641
1642free_netdev:
1643 free_netdev(ndev);
1644
1645 return ret;
1646}
1647
1648static int axienet_remove(struct platform_device *pdev)
1649{
1650 struct net_device *ndev = platform_get_drvdata(pdev);
1651 struct axienet_local *lp = netdev_priv(ndev);
1652
1653 axienet_mdio_teardown(lp);
1654 unregister_netdev(ndev);
1655
1656 of_node_put(lp->phy_node);
1657 lp->phy_node = NULL;
1658
1659 free_netdev(ndev);
1660
1661 return 0;
1662}
1663
1664static struct platform_driver axienet_driver = {
1665 .probe = axienet_probe,
1666 .remove = axienet_remove,
1667 .driver = {
1668 .name = "xilinx_axienet",
1669 .of_match_table = axienet_of_match,
1670 },
1671};
1672
1673module_platform_driver(axienet_driver);
1674
1675MODULE_DESCRIPTION("Xilinx Axi Ethernet driver");
1676MODULE_AUTHOR("Xilinx");
1677MODULE_LICENSE("GPL");