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1// SPDX-License-Identifier: GPL-2.0
2/* Renesas Ethernet AVB device driver
3 *
4 * Copyright (C) 2014-2019 Renesas Electronics Corporation
5 * Copyright (C) 2015 Renesas Solutions Corp.
6 * Copyright (C) 2015-2016 Cogent Embedded, Inc. <source@cogentembedded.com>
7 *
8 * Based on the SuperH Ethernet driver
9 */
10
11#include <linux/cache.h>
12#include <linux/clk.h>
13#include <linux/delay.h>
14#include <linux/dma-mapping.h>
15#include <linux/err.h>
16#include <linux/etherdevice.h>
17#include <linux/ethtool.h>
18#include <linux/if_vlan.h>
19#include <linux/kernel.h>
20#include <linux/list.h>
21#include <linux/module.h>
22#include <linux/net_tstamp.h>
23#include <linux/of.h>
24#include <linux/of_mdio.h>
25#include <linux/of_net.h>
26#include <linux/platform_device.h>
27#include <linux/pm_runtime.h>
28#include <linux/slab.h>
29#include <linux/spinlock.h>
30#include <linux/reset.h>
31#include <linux/math64.h>
32#include <net/ip.h>
33#include <net/page_pool/helpers.h>
34
35#include "ravb.h"
36
37#define RAVB_DEF_MSG_ENABLE \
38 (NETIF_MSG_LINK | \
39 NETIF_MSG_TIMER | \
40 NETIF_MSG_RX_ERR | \
41 NETIF_MSG_TX_ERR)
42
43void ravb_modify(struct net_device *ndev, enum ravb_reg reg, u32 clear,
44 u32 set)
45{
46 ravb_write(ndev, (ravb_read(ndev, reg) & ~clear) | set, reg);
47}
48
49int ravb_wait(struct net_device *ndev, enum ravb_reg reg, u32 mask, u32 value)
50{
51 int i;
52
53 for (i = 0; i < 10000; i++) {
54 if ((ravb_read(ndev, reg) & mask) == value)
55 return 0;
56 udelay(10);
57 }
58 return -ETIMEDOUT;
59}
60
61static int ravb_set_opmode(struct net_device *ndev, u32 opmode)
62{
63 u32 csr_ops = 1U << (opmode & CCC_OPC);
64 u32 ccc_mask = CCC_OPC;
65 int error;
66
67 /* If gPTP active in config mode is supported it needs to be configured
68 * along with CSEL and operating mode in the same access. This is a
69 * hardware limitation.
70 */
71 if (opmode & CCC_GAC)
72 ccc_mask |= CCC_GAC | CCC_CSEL;
73
74 /* Set operating mode */
75 ravb_modify(ndev, CCC, ccc_mask, opmode);
76 /* Check if the operating mode is changed to the requested one */
77 error = ravb_wait(ndev, CSR, CSR_OPS, csr_ops);
78 if (error) {
79 netdev_err(ndev, "failed to switch device to requested mode (%u)\n",
80 opmode & CCC_OPC);
81 }
82
83 return error;
84}
85
86static void ravb_set_rate_gbeth(struct net_device *ndev)
87{
88 struct ravb_private *priv = netdev_priv(ndev);
89
90 switch (priv->speed) {
91 case 10: /* 10BASE */
92 ravb_write(ndev, GBETH_GECMR_SPEED_10, GECMR);
93 break;
94 case 100: /* 100BASE */
95 ravb_write(ndev, GBETH_GECMR_SPEED_100, GECMR);
96 break;
97 case 1000: /* 1000BASE */
98 ravb_write(ndev, GBETH_GECMR_SPEED_1000, GECMR);
99 break;
100 }
101}
102
103static void ravb_set_rate_rcar(struct net_device *ndev)
104{
105 struct ravb_private *priv = netdev_priv(ndev);
106
107 switch (priv->speed) {
108 case 100: /* 100BASE */
109 ravb_write(ndev, GECMR_SPEED_100, GECMR);
110 break;
111 case 1000: /* 1000BASE */
112 ravb_write(ndev, GECMR_SPEED_1000, GECMR);
113 break;
114 }
115}
116
117/* Get MAC address from the MAC address registers
118 *
119 * Ethernet AVB device doesn't have ROM for MAC address.
120 * This function gets the MAC address that was used by a bootloader.
121 */
122static void ravb_read_mac_address(struct device_node *np,
123 struct net_device *ndev)
124{
125 int ret;
126
127 ret = of_get_ethdev_address(np, ndev);
128 if (ret) {
129 u32 mahr = ravb_read(ndev, MAHR);
130 u32 malr = ravb_read(ndev, MALR);
131 u8 addr[ETH_ALEN];
132
133 addr[0] = (mahr >> 24) & 0xFF;
134 addr[1] = (mahr >> 16) & 0xFF;
135 addr[2] = (mahr >> 8) & 0xFF;
136 addr[3] = (mahr >> 0) & 0xFF;
137 addr[4] = (malr >> 8) & 0xFF;
138 addr[5] = (malr >> 0) & 0xFF;
139 eth_hw_addr_set(ndev, addr);
140 }
141}
142
143static void ravb_mdio_ctrl(struct mdiobb_ctrl *ctrl, u32 mask, int set)
144{
145 struct ravb_private *priv = container_of(ctrl, struct ravb_private,
146 mdiobb);
147
148 ravb_modify(priv->ndev, PIR, mask, set ? mask : 0);
149}
150
151/* MDC pin control */
152static void ravb_set_mdc(struct mdiobb_ctrl *ctrl, int level)
153{
154 ravb_mdio_ctrl(ctrl, PIR_MDC, level);
155}
156
157/* Data I/O pin control */
158static void ravb_set_mdio_dir(struct mdiobb_ctrl *ctrl, int output)
159{
160 ravb_mdio_ctrl(ctrl, PIR_MMD, output);
161}
162
163/* Set data bit */
164static void ravb_set_mdio_data(struct mdiobb_ctrl *ctrl, int value)
165{
166 ravb_mdio_ctrl(ctrl, PIR_MDO, value);
167}
168
169/* Get data bit */
170static int ravb_get_mdio_data(struct mdiobb_ctrl *ctrl)
171{
172 struct ravb_private *priv = container_of(ctrl, struct ravb_private,
173 mdiobb);
174
175 return (ravb_read(priv->ndev, PIR) & PIR_MDI) != 0;
176}
177
178/* MDIO bus control struct */
179static const struct mdiobb_ops bb_ops = {
180 .owner = THIS_MODULE,
181 .set_mdc = ravb_set_mdc,
182 .set_mdio_dir = ravb_set_mdio_dir,
183 .set_mdio_data = ravb_set_mdio_data,
184 .get_mdio_data = ravb_get_mdio_data,
185};
186
187static struct ravb_rx_desc *
188ravb_rx_get_desc(struct ravb_private *priv, unsigned int q,
189 unsigned int i)
190{
191 return priv->rx_ring[q].raw + priv->info->rx_desc_size * i;
192}
193
194/* Free TX skb function for AVB-IP */
195static int ravb_tx_free(struct net_device *ndev, int q, bool free_txed_only)
196{
197 struct ravb_private *priv = netdev_priv(ndev);
198 struct net_device_stats *stats = &priv->stats[q];
199 unsigned int num_tx_desc = priv->num_tx_desc;
200 struct ravb_tx_desc *desc;
201 unsigned int entry;
202 int free_num = 0;
203 u32 size;
204
205 for (; priv->cur_tx[q] - priv->dirty_tx[q] > 0; priv->dirty_tx[q]++) {
206 bool txed;
207
208 entry = priv->dirty_tx[q] % (priv->num_tx_ring[q] *
209 num_tx_desc);
210 desc = &priv->tx_ring[q][entry];
211 txed = desc->die_dt == DT_FEMPTY;
212 if (free_txed_only && !txed)
213 break;
214 /* Descriptor type must be checked before all other reads */
215 dma_rmb();
216 size = le16_to_cpu(desc->ds_tagl) & TX_DS;
217 /* Free the original skb. */
218 if (priv->tx_skb[q][entry / num_tx_desc]) {
219 dma_unmap_single(ndev->dev.parent, le32_to_cpu(desc->dptr),
220 size, DMA_TO_DEVICE);
221 /* Last packet descriptor? */
222 if (entry % num_tx_desc == num_tx_desc - 1) {
223 entry /= num_tx_desc;
224 dev_kfree_skb_any(priv->tx_skb[q][entry]);
225 priv->tx_skb[q][entry] = NULL;
226 if (txed)
227 stats->tx_packets++;
228 }
229 free_num++;
230 }
231 if (txed)
232 stats->tx_bytes += size;
233 desc->die_dt = DT_EEMPTY;
234 }
235 return free_num;
236}
237
238static void ravb_rx_ring_free(struct net_device *ndev, int q)
239{
240 struct ravb_private *priv = netdev_priv(ndev);
241 unsigned int ring_size;
242
243 if (!priv->rx_ring[q].raw)
244 return;
245
246 ring_size = priv->info->rx_desc_size * (priv->num_rx_ring[q] + 1);
247 dma_free_coherent(ndev->dev.parent, ring_size, priv->rx_ring[q].raw,
248 priv->rx_desc_dma[q]);
249 priv->rx_ring[q].raw = NULL;
250}
251
252/* Free skb's and DMA buffers for Ethernet AVB */
253static void ravb_ring_free(struct net_device *ndev, int q)
254{
255 struct ravb_private *priv = netdev_priv(ndev);
256 unsigned int num_tx_desc = priv->num_tx_desc;
257 unsigned int ring_size;
258 unsigned int i;
259
260 ravb_rx_ring_free(ndev, q);
261
262 if (priv->tx_ring[q]) {
263 ravb_tx_free(ndev, q, false);
264
265 ring_size = sizeof(struct ravb_tx_desc) *
266 (priv->num_tx_ring[q] * num_tx_desc + 1);
267 dma_free_coherent(ndev->dev.parent, ring_size, priv->tx_ring[q],
268 priv->tx_desc_dma[q]);
269 priv->tx_ring[q] = NULL;
270 }
271
272 /* Free RX buffers */
273 for (i = 0; i < priv->num_rx_ring[q]; i++) {
274 if (priv->rx_buffers[q][i].page)
275 page_pool_put_page(priv->rx_pool[q],
276 priv->rx_buffers[q][i].page,
277 0, true);
278 }
279 kfree(priv->rx_buffers[q]);
280 priv->rx_buffers[q] = NULL;
281 page_pool_destroy(priv->rx_pool[q]);
282
283 /* Free aligned TX buffers */
284 kfree(priv->tx_align[q]);
285 priv->tx_align[q] = NULL;
286
287 /* Free TX skb ringbuffer.
288 * SKBs are freed by ravb_tx_free() call above.
289 */
290 kfree(priv->tx_skb[q]);
291 priv->tx_skb[q] = NULL;
292}
293
294static int
295ravb_alloc_rx_buffer(struct net_device *ndev, int q, u32 entry, gfp_t gfp_mask,
296 struct ravb_rx_desc *rx_desc)
297{
298 struct ravb_private *priv = netdev_priv(ndev);
299 const struct ravb_hw_info *info = priv->info;
300 struct ravb_rx_buffer *rx_buff;
301 dma_addr_t dma_addr;
302 unsigned int size;
303
304 rx_buff = &priv->rx_buffers[q][entry];
305 size = info->rx_buffer_size;
306 rx_buff->page = page_pool_alloc(priv->rx_pool[q], &rx_buff->offset,
307 &size, gfp_mask);
308 if (unlikely(!rx_buff->page)) {
309 /* We just set the data size to 0 for a failed mapping which
310 * should prevent DMA from happening...
311 */
312 rx_desc->ds_cc = cpu_to_le16(0);
313 return -ENOMEM;
314 }
315
316 dma_addr = page_pool_get_dma_addr(rx_buff->page) + rx_buff->offset;
317 dma_sync_single_for_device(ndev->dev.parent, dma_addr,
318 info->rx_buffer_size, DMA_FROM_DEVICE);
319 rx_desc->dptr = cpu_to_le32(dma_addr);
320
321 /* The end of the RX buffer is used to store skb shared data, so we need
322 * to ensure that the hardware leaves enough space for this.
323 */
324 rx_desc->ds_cc = cpu_to_le16(info->rx_buffer_size -
325 SKB_DATA_ALIGN(sizeof(struct skb_shared_info)) -
326 ETH_FCS_LEN + sizeof(__sum16));
327 return 0;
328}
329
330static u32
331ravb_rx_ring_refill(struct net_device *ndev, int q, u32 count, gfp_t gfp_mask)
332{
333 struct ravb_private *priv = netdev_priv(ndev);
334 struct ravb_rx_desc *rx_desc;
335 u32 i, entry;
336
337 for (i = 0; i < count; i++) {
338 entry = (priv->dirty_rx[q] + i) % priv->num_rx_ring[q];
339 rx_desc = ravb_rx_get_desc(priv, q, entry);
340
341 if (!priv->rx_buffers[q][entry].page) {
342 if (unlikely(ravb_alloc_rx_buffer(ndev, q, entry,
343 gfp_mask, rx_desc)))
344 break;
345 }
346 /* Descriptor type must be set after all the above writes */
347 dma_wmb();
348 rx_desc->die_dt = DT_FEMPTY;
349 }
350
351 return i;
352}
353
354/* Format skb and descriptor buffer for Ethernet AVB */
355static void ravb_ring_format(struct net_device *ndev, int q)
356{
357 struct ravb_private *priv = netdev_priv(ndev);
358 unsigned int num_tx_desc = priv->num_tx_desc;
359 struct ravb_rx_desc *rx_desc;
360 struct ravb_tx_desc *tx_desc;
361 struct ravb_desc *desc;
362 unsigned int tx_ring_size = sizeof(*tx_desc) * priv->num_tx_ring[q] *
363 num_tx_desc;
364 unsigned int i;
365
366 priv->cur_rx[q] = 0;
367 priv->cur_tx[q] = 0;
368 priv->dirty_rx[q] = 0;
369 priv->dirty_tx[q] = 0;
370
371 /* Regular RX descriptors have already been initialized by
372 * ravb_rx_ring_refill(), we just need to initialize the final link
373 * descriptor.
374 */
375 rx_desc = ravb_rx_get_desc(priv, q, priv->num_rx_ring[q]);
376 rx_desc->dptr = cpu_to_le32((u32)priv->rx_desc_dma[q]);
377 rx_desc->die_dt = DT_LINKFIX; /* type */
378
379 memset(priv->tx_ring[q], 0, tx_ring_size);
380 /* Build TX ring buffer */
381 for (i = 0, tx_desc = priv->tx_ring[q]; i < priv->num_tx_ring[q];
382 i++, tx_desc++) {
383 tx_desc->die_dt = DT_EEMPTY;
384 if (num_tx_desc > 1) {
385 tx_desc++;
386 tx_desc->die_dt = DT_EEMPTY;
387 }
388 }
389 tx_desc->dptr = cpu_to_le32((u32)priv->tx_desc_dma[q]);
390 tx_desc->die_dt = DT_LINKFIX; /* type */
391
392 /* RX descriptor base address for best effort */
393 desc = &priv->desc_bat[RX_QUEUE_OFFSET + q];
394 desc->die_dt = DT_LINKFIX; /* type */
395 desc->dptr = cpu_to_le32((u32)priv->rx_desc_dma[q]);
396
397 /* TX descriptor base address for best effort */
398 desc = &priv->desc_bat[q];
399 desc->die_dt = DT_LINKFIX; /* type */
400 desc->dptr = cpu_to_le32((u32)priv->tx_desc_dma[q]);
401}
402
403static void *ravb_alloc_rx_desc(struct net_device *ndev, int q)
404{
405 struct ravb_private *priv = netdev_priv(ndev);
406 unsigned int ring_size;
407
408 ring_size = priv->info->rx_desc_size * (priv->num_rx_ring[q] + 1);
409
410 priv->rx_ring[q].raw = dma_alloc_coherent(ndev->dev.parent, ring_size,
411 &priv->rx_desc_dma[q],
412 GFP_KERNEL);
413
414 return priv->rx_ring[q].raw;
415}
416
417/* Init skb and descriptor buffer for Ethernet AVB */
418static int ravb_ring_init(struct net_device *ndev, int q)
419{
420 struct ravb_private *priv = netdev_priv(ndev);
421 unsigned int num_tx_desc = priv->num_tx_desc;
422 struct page_pool_params params = {
423 .order = 0,
424 .flags = PP_FLAG_DMA_MAP,
425 .pool_size = priv->num_rx_ring[q],
426 .nid = NUMA_NO_NODE,
427 .dev = ndev->dev.parent,
428 .dma_dir = DMA_FROM_DEVICE,
429 };
430 unsigned int ring_size;
431 u32 num_filled;
432
433 /* Allocate RX page pool and buffers */
434 priv->rx_pool[q] = page_pool_create(¶ms);
435 if (IS_ERR(priv->rx_pool[q]))
436 goto error;
437
438 /* Allocate RX buffers */
439 priv->rx_buffers[q] = kcalloc(priv->num_rx_ring[q],
440 sizeof(*priv->rx_buffers[q]), GFP_KERNEL);
441 if (!priv->rx_buffers[q])
442 goto error;
443
444 /* Allocate TX skb rings */
445 priv->tx_skb[q] = kcalloc(priv->num_tx_ring[q],
446 sizeof(*priv->tx_skb[q]), GFP_KERNEL);
447 if (!priv->tx_skb[q])
448 goto error;
449
450 /* Allocate all RX descriptors. */
451 if (!ravb_alloc_rx_desc(ndev, q))
452 goto error;
453
454 /* Populate RX ring buffer. */
455 priv->dirty_rx[q] = 0;
456 ring_size = priv->info->rx_desc_size * priv->num_rx_ring[q];
457 memset(priv->rx_ring[q].raw, 0, ring_size);
458 num_filled = ravb_rx_ring_refill(ndev, q, priv->num_rx_ring[q],
459 GFP_KERNEL);
460 if (num_filled != priv->num_rx_ring[q])
461 goto error;
462
463 if (num_tx_desc > 1) {
464 /* Allocate rings for the aligned buffers */
465 priv->tx_align[q] = kmalloc(DPTR_ALIGN * priv->num_tx_ring[q] +
466 DPTR_ALIGN - 1, GFP_KERNEL);
467 if (!priv->tx_align[q])
468 goto error;
469 }
470
471 /* Allocate all TX descriptors. */
472 ring_size = sizeof(struct ravb_tx_desc) *
473 (priv->num_tx_ring[q] * num_tx_desc + 1);
474 priv->tx_ring[q] = dma_alloc_coherent(ndev->dev.parent, ring_size,
475 &priv->tx_desc_dma[q],
476 GFP_KERNEL);
477 if (!priv->tx_ring[q])
478 goto error;
479
480 return 0;
481
482error:
483 ravb_ring_free(ndev, q);
484
485 return -ENOMEM;
486}
487
488static void ravb_csum_init_gbeth(struct net_device *ndev)
489{
490 bool tx_enable = ndev->features & NETIF_F_HW_CSUM;
491 bool rx_enable = ndev->features & NETIF_F_RXCSUM;
492
493 if (!(tx_enable || rx_enable))
494 goto done;
495
496 ravb_write(ndev, 0, CSR0);
497 if (ravb_wait(ndev, CSR0, CSR0_TPE | CSR0_RPE, 0)) {
498 netdev_err(ndev, "Timeout enabling hardware checksum\n");
499
500 if (tx_enable)
501 ndev->features &= ~NETIF_F_HW_CSUM;
502
503 if (rx_enable)
504 ndev->features &= ~NETIF_F_RXCSUM;
505 } else {
506 if (tx_enable)
507 ravb_write(ndev, CSR1_CSUM_ENABLE, CSR1);
508
509 if (rx_enable)
510 ravb_write(ndev, CSR2_CSUM_ENABLE, CSR2);
511 }
512
513done:
514 ravb_write(ndev, CSR0_TPE | CSR0_RPE, CSR0);
515}
516
517static void ravb_emac_init_gbeth(struct net_device *ndev)
518{
519 struct ravb_private *priv = netdev_priv(ndev);
520
521 if (priv->phy_interface == PHY_INTERFACE_MODE_MII) {
522 ravb_write(ndev, (1000 << 16) | CXR35_SEL_XMII_MII, CXR35);
523 ravb_modify(ndev, CXR31, CXR31_SEL_LINK0 | CXR31_SEL_LINK1, 0);
524 } else {
525 ravb_write(ndev, (1000 << 16) | CXR35_SEL_XMII_RGMII, CXR35);
526 ravb_modify(ndev, CXR31, CXR31_SEL_LINK0 | CXR31_SEL_LINK1,
527 CXR31_SEL_LINK0);
528 }
529
530 /* Receive frame limit set register */
531 ravb_write(ndev, priv->info->rx_max_frame_size + ETH_FCS_LEN, RFLR);
532
533 /* EMAC Mode: PAUSE prohibition; Duplex; TX; RX; CRC Pass Through */
534 ravb_write(ndev, ECMR_ZPF | ((priv->duplex > 0) ? ECMR_DM : 0) |
535 ECMR_TE | ECMR_RE | ECMR_RCPT |
536 ECMR_TXF | ECMR_RXF, ECMR);
537
538 ravb_set_rate_gbeth(ndev);
539
540 /* Set MAC address */
541 ravb_write(ndev,
542 (ndev->dev_addr[0] << 24) | (ndev->dev_addr[1] << 16) |
543 (ndev->dev_addr[2] << 8) | (ndev->dev_addr[3]), MAHR);
544 ravb_write(ndev, (ndev->dev_addr[4] << 8) | (ndev->dev_addr[5]), MALR);
545
546 /* E-MAC status register clear */
547 ravb_write(ndev, ECSR_ICD | ECSR_LCHNG | ECSR_PFRI, ECSR);
548
549 ravb_csum_init_gbeth(ndev);
550
551 /* E-MAC interrupt enable register */
552 ravb_write(ndev, ECSIPR_ICDIP, ECSIPR);
553}
554
555static void ravb_emac_init_rcar(struct net_device *ndev)
556{
557 struct ravb_private *priv = netdev_priv(ndev);
558
559 /* Set receive frame length
560 *
561 * The length set here describes the frame from the destination address
562 * up to and including the CRC data. However only the frame data,
563 * excluding the CRC, are transferred to memory. To allow for the
564 * largest frames add the CRC length to the maximum Rx descriptor size.
565 */
566 ravb_write(ndev, priv->info->rx_max_frame_size + ETH_FCS_LEN, RFLR);
567
568 /* EMAC Mode: PAUSE prohibition; Duplex; RX Checksum; TX; RX */
569 ravb_write(ndev, ECMR_ZPF | ECMR_DM |
570 (ndev->features & NETIF_F_RXCSUM ? ECMR_RCSC : 0) |
571 ECMR_TE | ECMR_RE, ECMR);
572
573 ravb_set_rate_rcar(ndev);
574
575 /* Set MAC address */
576 ravb_write(ndev,
577 (ndev->dev_addr[0] << 24) | (ndev->dev_addr[1] << 16) |
578 (ndev->dev_addr[2] << 8) | (ndev->dev_addr[3]), MAHR);
579 ravb_write(ndev,
580 (ndev->dev_addr[4] << 8) | (ndev->dev_addr[5]), MALR);
581
582 /* E-MAC status register clear */
583 ravb_write(ndev, ECSR_ICD | ECSR_MPD, ECSR);
584
585 /* E-MAC interrupt enable register */
586 ravb_write(ndev, ECSIPR_ICDIP | ECSIPR_MPDIP | ECSIPR_LCHNGIP, ECSIPR);
587}
588
589static void ravb_emac_init_rcar_gen4(struct net_device *ndev)
590{
591 struct ravb_private *priv = netdev_priv(ndev);
592 bool mii = priv->phy_interface == PHY_INTERFACE_MODE_MII;
593
594 ravb_modify(ndev, APSR, APSR_MIISELECT, mii ? APSR_MIISELECT : 0);
595
596 ravb_emac_init_rcar(ndev);
597}
598
599/* E-MAC init function */
600static void ravb_emac_init(struct net_device *ndev)
601{
602 struct ravb_private *priv = netdev_priv(ndev);
603 const struct ravb_hw_info *info = priv->info;
604
605 info->emac_init(ndev);
606}
607
608static int ravb_dmac_init_gbeth(struct net_device *ndev)
609{
610 struct ravb_private *priv = netdev_priv(ndev);
611 int error;
612
613 error = ravb_ring_init(ndev, RAVB_BE);
614 if (error)
615 return error;
616
617 /* Descriptor format */
618 ravb_ring_format(ndev, RAVB_BE);
619
620 /* Set DMAC RX */
621 ravb_write(ndev, 0x60000000, RCR);
622
623 /* Set Max Frame Length (RTC) */
624 ravb_write(ndev, 0x7ffc0000 | priv->info->rx_max_frame_size, RTC);
625
626 /* Set FIFO size */
627 ravb_write(ndev, 0x00222200, TGC);
628
629 ravb_write(ndev, 0, TCCR);
630
631 /* Frame receive */
632 ravb_write(ndev, RIC0_FRE0, RIC0);
633 /* Disable FIFO full warning */
634 ravb_write(ndev, 0x0, RIC1);
635 /* Receive FIFO full error, descriptor empty */
636 ravb_write(ndev, RIC2_QFE0 | RIC2_RFFE, RIC2);
637
638 ravb_write(ndev, TIC_FTE0, TIC);
639
640 return 0;
641}
642
643static int ravb_dmac_init_rcar(struct net_device *ndev)
644{
645 struct ravb_private *priv = netdev_priv(ndev);
646 const struct ravb_hw_info *info = priv->info;
647 int error;
648
649 error = ravb_ring_init(ndev, RAVB_BE);
650 if (error)
651 return error;
652 error = ravb_ring_init(ndev, RAVB_NC);
653 if (error) {
654 ravb_ring_free(ndev, RAVB_BE);
655 return error;
656 }
657
658 /* Descriptor format */
659 ravb_ring_format(ndev, RAVB_BE);
660 ravb_ring_format(ndev, RAVB_NC);
661
662 /* Set AVB RX */
663 ravb_write(ndev,
664 RCR_EFFS | RCR_ENCF | RCR_ETS0 | RCR_ESF | 0x18000000, RCR);
665
666 /* Set FIFO size */
667 ravb_write(ndev, TGC_TQP_AVBMODE1 | 0x00112200, TGC);
668
669 /* Timestamp enable */
670 ravb_write(ndev, TCCR_TFEN, TCCR);
671
672 /* Interrupt init: */
673 if (info->multi_irqs) {
674 /* Clear DIL.DPLx */
675 ravb_write(ndev, 0, DIL);
676 /* Set queue specific interrupt */
677 ravb_write(ndev, CIE_CRIE | CIE_CTIE | CIE_CL0M, CIE);
678 }
679 /* Frame receive */
680 ravb_write(ndev, RIC0_FRE0 | RIC0_FRE1, RIC0);
681 /* Disable FIFO full warning */
682 ravb_write(ndev, 0, RIC1);
683 /* Receive FIFO full error, descriptor empty */
684 ravb_write(ndev, RIC2_QFE0 | RIC2_QFE1 | RIC2_RFFE, RIC2);
685 /* Frame transmitted, timestamp FIFO updated */
686 ravb_write(ndev, TIC_FTE0 | TIC_FTE1 | TIC_TFUE, TIC);
687
688 return 0;
689}
690
691/* Device init function for Ethernet AVB */
692static int ravb_dmac_init(struct net_device *ndev)
693{
694 struct ravb_private *priv = netdev_priv(ndev);
695 const struct ravb_hw_info *info = priv->info;
696 int error;
697
698 /* Set CONFIG mode */
699 error = ravb_set_opmode(ndev, CCC_OPC_CONFIG);
700 if (error)
701 return error;
702
703 error = info->dmac_init(ndev);
704 if (error)
705 return error;
706
707 /* Setting the control will start the AVB-DMAC process. */
708 return ravb_set_opmode(ndev, CCC_OPC_OPERATION);
709}
710
711static void ravb_get_tx_tstamp(struct net_device *ndev)
712{
713 struct ravb_private *priv = netdev_priv(ndev);
714 struct ravb_tstamp_skb *ts_skb, *ts_skb2;
715 struct skb_shared_hwtstamps shhwtstamps;
716 struct sk_buff *skb;
717 struct timespec64 ts;
718 u16 tag, tfa_tag;
719 int count;
720 u32 tfa2;
721
722 count = (ravb_read(ndev, TSR) & TSR_TFFL) >> 8;
723 while (count--) {
724 tfa2 = ravb_read(ndev, TFA2);
725 tfa_tag = (tfa2 & TFA2_TST) >> 16;
726 ts.tv_nsec = (u64)ravb_read(ndev, TFA0);
727 ts.tv_sec = ((u64)(tfa2 & TFA2_TSV) << 32) |
728 ravb_read(ndev, TFA1);
729 memset(&shhwtstamps, 0, sizeof(shhwtstamps));
730 shhwtstamps.hwtstamp = timespec64_to_ktime(ts);
731 list_for_each_entry_safe(ts_skb, ts_skb2, &priv->ts_skb_list,
732 list) {
733 skb = ts_skb->skb;
734 tag = ts_skb->tag;
735 list_del(&ts_skb->list);
736 kfree(ts_skb);
737 if (tag == tfa_tag) {
738 skb_tstamp_tx(skb, &shhwtstamps);
739 dev_consume_skb_any(skb);
740 break;
741 } else {
742 dev_kfree_skb_any(skb);
743 }
744 }
745 ravb_modify(ndev, TCCR, TCCR_TFR, TCCR_TFR);
746 }
747}
748
749static void ravb_rx_csum_gbeth(struct sk_buff *skb)
750{
751 struct skb_shared_info *shinfo = skb_shinfo(skb);
752 size_t csum_len;
753 u16 *hw_csum;
754
755 /* The hardware checksum status is contained in 4 bytes appended to
756 * packet data.
757 *
758 * For ipv4, the first 2 bytes are the ip header checksum status. We can
759 * ignore this as it will always be re-checked in inet_gro_receive().
760 *
761 * The last 2 bytes are the protocol checksum status which will be zero
762 * if the checksum has been validated.
763 */
764 csum_len = sizeof(*hw_csum) * 2;
765 if (unlikely(skb->len < csum_len))
766 return;
767
768 if (skb_is_nonlinear(skb)) {
769 skb_frag_t *last_frag = &shinfo->frags[shinfo->nr_frags - 1];
770
771 hw_csum = (u16 *)(skb_frag_address(last_frag) +
772 skb_frag_size(last_frag));
773 skb_frag_size_sub(last_frag, csum_len);
774 } else {
775 hw_csum = (u16 *)skb_tail_pointer(skb);
776 skb_trim(skb, skb->len - csum_len);
777 }
778
779 if (!get_unaligned(--hw_csum))
780 skb->ip_summed = CHECKSUM_UNNECESSARY;
781}
782
783static void ravb_rx_csum(struct sk_buff *skb)
784{
785 u8 *hw_csum;
786
787 /* The hardware checksum is contained in sizeof(__sum16) (2) bytes
788 * appended to packet data
789 */
790 if (unlikely(skb->len < sizeof(__sum16)))
791 return;
792 hw_csum = skb_tail_pointer(skb) - sizeof(__sum16);
793 skb->csum = csum_unfold((__force __sum16)get_unaligned_le16(hw_csum));
794 skb->ip_summed = CHECKSUM_COMPLETE;
795 skb_trim(skb, skb->len - sizeof(__sum16));
796}
797
798/* Packet receive function for Gigabit Ethernet */
799static int ravb_rx_gbeth(struct net_device *ndev, int budget, int q)
800{
801 struct ravb_private *priv = netdev_priv(ndev);
802 const struct ravb_hw_info *info = priv->info;
803 struct net_device_stats *stats;
804 struct ravb_rx_desc *desc;
805 struct sk_buff *skb;
806 int rx_packets = 0;
807 u8 desc_status;
808 u16 desc_len;
809 u8 die_dt;
810 int entry;
811 int limit;
812 int i;
813
814 limit = priv->dirty_rx[q] + priv->num_rx_ring[q] - priv->cur_rx[q];
815 stats = &priv->stats[q];
816
817 for (i = 0; i < limit; i++, priv->cur_rx[q]++) {
818 entry = priv->cur_rx[q] % priv->num_rx_ring[q];
819 desc = &priv->rx_ring[q].desc[entry];
820 if (rx_packets == budget || desc->die_dt == DT_FEMPTY)
821 break;
822
823 /* Descriptor type must be checked before all other reads */
824 dma_rmb();
825 desc_status = desc->msc;
826 desc_len = le16_to_cpu(desc->ds_cc) & RX_DS;
827
828 /* We use 0-byte descriptors to mark the DMA mapping errors */
829 if (!desc_len)
830 continue;
831
832 if (desc_status & MSC_MC)
833 stats->multicast++;
834
835 if (desc_status & (MSC_CRC | MSC_RFE | MSC_RTSF | MSC_RTLF | MSC_CEEF)) {
836 stats->rx_errors++;
837 if (desc_status & MSC_CRC)
838 stats->rx_crc_errors++;
839 if (desc_status & MSC_RFE)
840 stats->rx_frame_errors++;
841 if (desc_status & (MSC_RTLF | MSC_RTSF))
842 stats->rx_length_errors++;
843 if (desc_status & MSC_CEEF)
844 stats->rx_missed_errors++;
845 } else {
846 struct ravb_rx_buffer *rx_buff;
847 void *rx_addr;
848
849 rx_buff = &priv->rx_buffers[q][entry];
850 rx_addr = page_address(rx_buff->page) + rx_buff->offset;
851 die_dt = desc->die_dt & 0xF0;
852 dma_sync_single_for_cpu(ndev->dev.parent,
853 le32_to_cpu(desc->dptr),
854 desc_len, DMA_FROM_DEVICE);
855
856 switch (die_dt) {
857 case DT_FSINGLE:
858 case DT_FSTART:
859 /* Start of packet: Set initial data length. */
860 skb = napi_build_skb(rx_addr,
861 info->rx_buffer_size);
862 if (unlikely(!skb)) {
863 stats->rx_errors++;
864 page_pool_put_page(priv->rx_pool[q],
865 rx_buff->page, 0,
866 true);
867 goto refill;
868 }
869 skb_mark_for_recycle(skb);
870 skb_put(skb, desc_len);
871
872 /* Save this skb if the packet spans multiple
873 * descriptors.
874 */
875 if (die_dt == DT_FSTART)
876 priv->rx_1st_skb = skb;
877 break;
878
879 case DT_FMID:
880 case DT_FEND:
881 /* Continuing a packet: Add this buffer as an RX
882 * frag.
883 */
884
885 /* rx_1st_skb will be NULL if napi_build_skb()
886 * failed for the first descriptor of a
887 * multi-descriptor packet.
888 */
889 if (unlikely(!priv->rx_1st_skb)) {
890 stats->rx_errors++;
891 page_pool_put_page(priv->rx_pool[q],
892 rx_buff->page, 0,
893 true);
894
895 /* We may find a DT_FSINGLE or DT_FSTART
896 * descriptor in the queue which we can
897 * process, so don't give up yet.
898 */
899 continue;
900 }
901 skb_add_rx_frag(priv->rx_1st_skb,
902 skb_shinfo(priv->rx_1st_skb)->nr_frags,
903 rx_buff->page, rx_buff->offset,
904 desc_len, info->rx_buffer_size);
905
906 /* Set skb to point at the whole packet so that
907 * we only need one code path for finishing a
908 * packet.
909 */
910 skb = priv->rx_1st_skb;
911 }
912
913 switch (die_dt) {
914 case DT_FSINGLE:
915 case DT_FEND:
916 /* Finishing a packet: Determine protocol &
917 * checksum, hand off to NAPI and update our
918 * stats.
919 */
920 skb->protocol = eth_type_trans(skb, ndev);
921 if (ndev->features & NETIF_F_RXCSUM)
922 ravb_rx_csum_gbeth(skb);
923 stats->rx_bytes += skb->len;
924 napi_gro_receive(&priv->napi[q], skb);
925 rx_packets++;
926
927 /* Clear rx_1st_skb so that it will only be
928 * non-NULL when valid.
929 */
930 priv->rx_1st_skb = NULL;
931 }
932
933 /* Mark this RX buffer as consumed. */
934 rx_buff->page = NULL;
935 }
936 }
937
938refill:
939 /* Refill the RX ring buffers. */
940 priv->dirty_rx[q] += ravb_rx_ring_refill(ndev, q,
941 priv->cur_rx[q] - priv->dirty_rx[q],
942 GFP_ATOMIC);
943
944 stats->rx_packets += rx_packets;
945 return rx_packets;
946}
947
948/* Packet receive function for Ethernet AVB */
949static int ravb_rx_rcar(struct net_device *ndev, int budget, int q)
950{
951 struct ravb_private *priv = netdev_priv(ndev);
952 const struct ravb_hw_info *info = priv->info;
953 struct net_device_stats *stats = &priv->stats[q];
954 struct ravb_ex_rx_desc *desc;
955 unsigned int limit, i;
956 struct sk_buff *skb;
957 struct timespec64 ts;
958 int rx_packets = 0;
959 u8 desc_status;
960 u16 pkt_len;
961 int entry;
962
963 limit = priv->dirty_rx[q] + priv->num_rx_ring[q] - priv->cur_rx[q];
964 for (i = 0; i < limit; i++, priv->cur_rx[q]++) {
965 entry = priv->cur_rx[q] % priv->num_rx_ring[q];
966 desc = &priv->rx_ring[q].ex_desc[entry];
967 if (rx_packets == budget || desc->die_dt == DT_FEMPTY)
968 break;
969
970 /* Descriptor type must be checked before all other reads */
971 dma_rmb();
972 desc_status = desc->msc;
973 pkt_len = le16_to_cpu(desc->ds_cc) & RX_DS;
974
975 /* We use 0-byte descriptors to mark the DMA mapping errors */
976 if (!pkt_len)
977 continue;
978
979 if (desc_status & MSC_MC)
980 stats->multicast++;
981
982 if (desc_status & (MSC_CRC | MSC_RFE | MSC_RTSF | MSC_RTLF |
983 MSC_CEEF)) {
984 stats->rx_errors++;
985 if (desc_status & MSC_CRC)
986 stats->rx_crc_errors++;
987 if (desc_status & MSC_RFE)
988 stats->rx_frame_errors++;
989 if (desc_status & (MSC_RTLF | MSC_RTSF))
990 stats->rx_length_errors++;
991 if (desc_status & MSC_CEEF)
992 stats->rx_missed_errors++;
993 } else {
994 u32 get_ts = priv->tstamp_rx_ctrl & RAVB_RXTSTAMP_TYPE;
995 struct ravb_rx_buffer *rx_buff;
996 void *rx_addr;
997
998 rx_buff = &priv->rx_buffers[q][entry];
999 rx_addr = page_address(rx_buff->page) + rx_buff->offset;
1000 dma_sync_single_for_cpu(ndev->dev.parent,
1001 le32_to_cpu(desc->dptr),
1002 pkt_len, DMA_FROM_DEVICE);
1003
1004 skb = napi_build_skb(rx_addr, info->rx_buffer_size);
1005 if (unlikely(!skb)) {
1006 stats->rx_errors++;
1007 page_pool_put_page(priv->rx_pool[q],
1008 rx_buff->page, 0, true);
1009 break;
1010 }
1011 skb_mark_for_recycle(skb);
1012 get_ts &= (q == RAVB_NC) ?
1013 RAVB_RXTSTAMP_TYPE_V2_L2_EVENT :
1014 ~RAVB_RXTSTAMP_TYPE_V2_L2_EVENT;
1015 if (get_ts) {
1016 struct skb_shared_hwtstamps *shhwtstamps;
1017
1018 shhwtstamps = skb_hwtstamps(skb);
1019 memset(shhwtstamps, 0, sizeof(*shhwtstamps));
1020 ts.tv_sec = ((u64) le16_to_cpu(desc->ts_sh) <<
1021 32) | le32_to_cpu(desc->ts_sl);
1022 ts.tv_nsec = le32_to_cpu(desc->ts_n);
1023 shhwtstamps->hwtstamp = timespec64_to_ktime(ts);
1024 }
1025
1026 skb_put(skb, pkt_len);
1027 skb->protocol = eth_type_trans(skb, ndev);
1028 if (ndev->features & NETIF_F_RXCSUM)
1029 ravb_rx_csum(skb);
1030 napi_gro_receive(&priv->napi[q], skb);
1031 rx_packets++;
1032 stats->rx_bytes += pkt_len;
1033
1034 /* Mark this RX buffer as consumed. */
1035 rx_buff->page = NULL;
1036 }
1037 }
1038
1039 /* Refill the RX ring buffers. */
1040 priv->dirty_rx[q] += ravb_rx_ring_refill(ndev, q,
1041 priv->cur_rx[q] - priv->dirty_rx[q],
1042 GFP_ATOMIC);
1043
1044 stats->rx_packets += rx_packets;
1045 return rx_packets;
1046}
1047
1048/* Packet receive function for Ethernet AVB */
1049static int ravb_rx(struct net_device *ndev, int budget, int q)
1050{
1051 struct ravb_private *priv = netdev_priv(ndev);
1052 const struct ravb_hw_info *info = priv->info;
1053
1054 return info->receive(ndev, budget, q);
1055}
1056
1057static void ravb_rcv_snd_disable(struct net_device *ndev)
1058{
1059 /* Disable TX and RX */
1060 ravb_modify(ndev, ECMR, ECMR_RE | ECMR_TE, 0);
1061}
1062
1063static void ravb_rcv_snd_enable(struct net_device *ndev)
1064{
1065 /* Enable TX and RX */
1066 ravb_modify(ndev, ECMR, ECMR_RE | ECMR_TE, ECMR_RE | ECMR_TE);
1067}
1068
1069/* function for waiting dma process finished */
1070static int ravb_stop_dma(struct net_device *ndev)
1071{
1072 struct ravb_private *priv = netdev_priv(ndev);
1073 const struct ravb_hw_info *info = priv->info;
1074 int error;
1075
1076 /* Wait for stopping the hardware TX process */
1077 error = ravb_wait(ndev, TCCR, info->tccr_mask, 0);
1078
1079 if (error)
1080 return error;
1081
1082 error = ravb_wait(ndev, CSR, CSR_TPO0 | CSR_TPO1 | CSR_TPO2 | CSR_TPO3,
1083 0);
1084 if (error)
1085 return error;
1086
1087 /* Stop the E-MAC's RX/TX processes. */
1088 ravb_rcv_snd_disable(ndev);
1089
1090 /* Wait for stopping the RX DMA process */
1091 error = ravb_wait(ndev, CSR, CSR_RPO, 0);
1092 if (error)
1093 return error;
1094
1095 /* Stop AVB-DMAC process */
1096 return ravb_set_opmode(ndev, CCC_OPC_CONFIG);
1097}
1098
1099/* E-MAC interrupt handler */
1100static void ravb_emac_interrupt_unlocked(struct net_device *ndev)
1101{
1102 struct ravb_private *priv = netdev_priv(ndev);
1103 u32 ecsr, psr;
1104
1105 ecsr = ravb_read(ndev, ECSR);
1106 ravb_write(ndev, ecsr, ECSR); /* clear interrupt */
1107
1108 if (ecsr & ECSR_MPD)
1109 pm_wakeup_event(&priv->pdev->dev, 0);
1110 if (ecsr & ECSR_ICD)
1111 ndev->stats.tx_carrier_errors++;
1112 if (ecsr & ECSR_LCHNG) {
1113 /* Link changed */
1114 if (priv->no_avb_link)
1115 return;
1116 psr = ravb_read(ndev, PSR);
1117 if (priv->avb_link_active_low)
1118 psr ^= PSR_LMON;
1119 if (!(psr & PSR_LMON)) {
1120 /* DIsable RX and TX */
1121 ravb_rcv_snd_disable(ndev);
1122 } else {
1123 /* Enable RX and TX */
1124 ravb_rcv_snd_enable(ndev);
1125 }
1126 }
1127}
1128
1129static irqreturn_t ravb_emac_interrupt(int irq, void *dev_id)
1130{
1131 struct net_device *ndev = dev_id;
1132 struct ravb_private *priv = netdev_priv(ndev);
1133 struct device *dev = &priv->pdev->dev;
1134 irqreturn_t result = IRQ_HANDLED;
1135
1136 pm_runtime_get_noresume(dev);
1137
1138 if (unlikely(!pm_runtime_active(dev))) {
1139 result = IRQ_NONE;
1140 goto out_rpm_put;
1141 }
1142
1143 spin_lock(&priv->lock);
1144 ravb_emac_interrupt_unlocked(ndev);
1145 spin_unlock(&priv->lock);
1146
1147out_rpm_put:
1148 pm_runtime_put_noidle(dev);
1149 return result;
1150}
1151
1152/* Error interrupt handler */
1153static void ravb_error_interrupt(struct net_device *ndev)
1154{
1155 struct ravb_private *priv = netdev_priv(ndev);
1156 u32 eis, ris2;
1157
1158 eis = ravb_read(ndev, EIS);
1159 ravb_write(ndev, ~(EIS_QFS | EIS_RESERVED), EIS);
1160 if (eis & EIS_QFS) {
1161 ris2 = ravb_read(ndev, RIS2);
1162 ravb_write(ndev, ~(RIS2_QFF0 | RIS2_QFF1 | RIS2_RFFF | RIS2_RESERVED),
1163 RIS2);
1164
1165 /* Receive Descriptor Empty int */
1166 if (ris2 & RIS2_QFF0)
1167 priv->stats[RAVB_BE].rx_over_errors++;
1168
1169 /* Receive Descriptor Empty int */
1170 if (ris2 & RIS2_QFF1)
1171 priv->stats[RAVB_NC].rx_over_errors++;
1172
1173 /* Receive FIFO Overflow int */
1174 if (ris2 & RIS2_RFFF)
1175 priv->rx_fifo_errors++;
1176 }
1177}
1178
1179static bool ravb_queue_interrupt(struct net_device *ndev, int q)
1180{
1181 struct ravb_private *priv = netdev_priv(ndev);
1182 const struct ravb_hw_info *info = priv->info;
1183 u32 ris0 = ravb_read(ndev, RIS0);
1184 u32 ric0 = ravb_read(ndev, RIC0);
1185 u32 tis = ravb_read(ndev, TIS);
1186 u32 tic = ravb_read(ndev, TIC);
1187
1188 if (((ris0 & ric0) & BIT(q)) || ((tis & tic) & BIT(q))) {
1189 if (napi_schedule_prep(&priv->napi[q])) {
1190 /* Mask RX and TX interrupts */
1191 if (!info->irq_en_dis) {
1192 ravb_write(ndev, ric0 & ~BIT(q), RIC0);
1193 ravb_write(ndev, tic & ~BIT(q), TIC);
1194 } else {
1195 ravb_write(ndev, BIT(q), RID0);
1196 ravb_write(ndev, BIT(q), TID);
1197 }
1198 __napi_schedule(&priv->napi[q]);
1199 } else {
1200 netdev_warn(ndev,
1201 "ignoring interrupt, rx status 0x%08x, rx mask 0x%08x,\n",
1202 ris0, ric0);
1203 netdev_warn(ndev,
1204 " tx status 0x%08x, tx mask 0x%08x.\n",
1205 tis, tic);
1206 }
1207 return true;
1208 }
1209 return false;
1210}
1211
1212static bool ravb_timestamp_interrupt(struct net_device *ndev)
1213{
1214 u32 tis = ravb_read(ndev, TIS);
1215
1216 if (tis & TIS_TFUF) {
1217 ravb_write(ndev, ~(TIS_TFUF | TIS_RESERVED), TIS);
1218 ravb_get_tx_tstamp(ndev);
1219 return true;
1220 }
1221 return false;
1222}
1223
1224static irqreturn_t ravb_interrupt(int irq, void *dev_id)
1225{
1226 struct net_device *ndev = dev_id;
1227 struct ravb_private *priv = netdev_priv(ndev);
1228 const struct ravb_hw_info *info = priv->info;
1229 struct device *dev = &priv->pdev->dev;
1230 irqreturn_t result = IRQ_NONE;
1231 u32 iss;
1232
1233 pm_runtime_get_noresume(dev);
1234
1235 if (unlikely(!pm_runtime_active(dev)))
1236 goto out_rpm_put;
1237
1238 spin_lock(&priv->lock);
1239 /* Get interrupt status */
1240 iss = ravb_read(ndev, ISS);
1241
1242 /* Received and transmitted interrupts */
1243 if (iss & (ISS_FRS | ISS_FTS | ISS_TFUS)) {
1244 int q;
1245
1246 /* Timestamp updated */
1247 if (ravb_timestamp_interrupt(ndev))
1248 result = IRQ_HANDLED;
1249
1250 /* Network control and best effort queue RX/TX */
1251 if (info->nc_queues) {
1252 for (q = RAVB_NC; q >= RAVB_BE; q--) {
1253 if (ravb_queue_interrupt(ndev, q))
1254 result = IRQ_HANDLED;
1255 }
1256 } else {
1257 if (ravb_queue_interrupt(ndev, RAVB_BE))
1258 result = IRQ_HANDLED;
1259 }
1260 }
1261
1262 /* E-MAC status summary */
1263 if (iss & ISS_MS) {
1264 ravb_emac_interrupt_unlocked(ndev);
1265 result = IRQ_HANDLED;
1266 }
1267
1268 /* Error status summary */
1269 if (iss & ISS_ES) {
1270 ravb_error_interrupt(ndev);
1271 result = IRQ_HANDLED;
1272 }
1273
1274 /* gPTP interrupt status summary */
1275 if (iss & ISS_CGIS) {
1276 ravb_ptp_interrupt(ndev);
1277 result = IRQ_HANDLED;
1278 }
1279
1280 spin_unlock(&priv->lock);
1281
1282out_rpm_put:
1283 pm_runtime_put_noidle(dev);
1284 return result;
1285}
1286
1287/* Timestamp/Error/gPTP interrupt handler */
1288static irqreturn_t ravb_multi_interrupt(int irq, void *dev_id)
1289{
1290 struct net_device *ndev = dev_id;
1291 struct ravb_private *priv = netdev_priv(ndev);
1292 struct device *dev = &priv->pdev->dev;
1293 irqreturn_t result = IRQ_NONE;
1294 u32 iss;
1295
1296 pm_runtime_get_noresume(dev);
1297
1298 if (unlikely(!pm_runtime_active(dev)))
1299 goto out_rpm_put;
1300
1301 spin_lock(&priv->lock);
1302 /* Get interrupt status */
1303 iss = ravb_read(ndev, ISS);
1304
1305 /* Timestamp updated */
1306 if ((iss & ISS_TFUS) && ravb_timestamp_interrupt(ndev))
1307 result = IRQ_HANDLED;
1308
1309 /* Error status summary */
1310 if (iss & ISS_ES) {
1311 ravb_error_interrupt(ndev);
1312 result = IRQ_HANDLED;
1313 }
1314
1315 /* gPTP interrupt status summary */
1316 if (iss & ISS_CGIS) {
1317 ravb_ptp_interrupt(ndev);
1318 result = IRQ_HANDLED;
1319 }
1320
1321 spin_unlock(&priv->lock);
1322
1323out_rpm_put:
1324 pm_runtime_put_noidle(dev);
1325 return result;
1326}
1327
1328static irqreturn_t ravb_dma_interrupt(int irq, void *dev_id, int q)
1329{
1330 struct net_device *ndev = dev_id;
1331 struct ravb_private *priv = netdev_priv(ndev);
1332 struct device *dev = &priv->pdev->dev;
1333 irqreturn_t result = IRQ_NONE;
1334
1335 pm_runtime_get_noresume(dev);
1336
1337 if (unlikely(!pm_runtime_active(dev)))
1338 goto out_rpm_put;
1339
1340 spin_lock(&priv->lock);
1341
1342 /* Network control/Best effort queue RX/TX */
1343 if (ravb_queue_interrupt(ndev, q))
1344 result = IRQ_HANDLED;
1345
1346 spin_unlock(&priv->lock);
1347
1348out_rpm_put:
1349 pm_runtime_put_noidle(dev);
1350 return result;
1351}
1352
1353static irqreturn_t ravb_be_interrupt(int irq, void *dev_id)
1354{
1355 return ravb_dma_interrupt(irq, dev_id, RAVB_BE);
1356}
1357
1358static irqreturn_t ravb_nc_interrupt(int irq, void *dev_id)
1359{
1360 return ravb_dma_interrupt(irq, dev_id, RAVB_NC);
1361}
1362
1363static int ravb_poll(struct napi_struct *napi, int budget)
1364{
1365 struct net_device *ndev = napi->dev;
1366 struct ravb_private *priv = netdev_priv(ndev);
1367 const struct ravb_hw_info *info = priv->info;
1368 unsigned long flags;
1369 int q = napi - priv->napi;
1370 int mask = BIT(q);
1371 int work_done;
1372
1373 /* Processing RX Descriptor Ring */
1374 /* Clear RX interrupt */
1375 ravb_write(ndev, ~(mask | RIS0_RESERVED), RIS0);
1376 work_done = ravb_rx(ndev, budget, q);
1377
1378 /* Processing TX Descriptor Ring */
1379 spin_lock_irqsave(&priv->lock, flags);
1380 /* Clear TX interrupt */
1381 ravb_write(ndev, ~(mask | TIS_RESERVED), TIS);
1382 ravb_tx_free(ndev, q, true);
1383 netif_wake_subqueue(ndev, q);
1384 spin_unlock_irqrestore(&priv->lock, flags);
1385
1386 /* Receive error message handling */
1387 priv->rx_over_errors = priv->stats[RAVB_BE].rx_over_errors;
1388 if (info->nc_queues)
1389 priv->rx_over_errors += priv->stats[RAVB_NC].rx_over_errors;
1390 if (priv->rx_over_errors != ndev->stats.rx_over_errors)
1391 ndev->stats.rx_over_errors = priv->rx_over_errors;
1392 if (priv->rx_fifo_errors != ndev->stats.rx_fifo_errors)
1393 ndev->stats.rx_fifo_errors = priv->rx_fifo_errors;
1394
1395 if (work_done < budget && napi_complete_done(napi, work_done)) {
1396 /* Re-enable RX/TX interrupts */
1397 spin_lock_irqsave(&priv->lock, flags);
1398 if (!info->irq_en_dis) {
1399 ravb_modify(ndev, RIC0, mask, mask);
1400 ravb_modify(ndev, TIC, mask, mask);
1401 } else {
1402 ravb_write(ndev, mask, RIE0);
1403 ravb_write(ndev, mask, TIE);
1404 }
1405 spin_unlock_irqrestore(&priv->lock, flags);
1406 }
1407
1408 return work_done;
1409}
1410
1411static void ravb_set_duplex_gbeth(struct net_device *ndev)
1412{
1413 struct ravb_private *priv = netdev_priv(ndev);
1414
1415 ravb_modify(ndev, ECMR, ECMR_DM, priv->duplex > 0 ? ECMR_DM : 0);
1416}
1417
1418/* PHY state control function */
1419static void ravb_adjust_link(struct net_device *ndev)
1420{
1421 struct ravb_private *priv = netdev_priv(ndev);
1422 const struct ravb_hw_info *info = priv->info;
1423 struct phy_device *phydev = ndev->phydev;
1424 bool new_state = false;
1425 unsigned long flags;
1426
1427 spin_lock_irqsave(&priv->lock, flags);
1428
1429 /* Disable TX and RX right over here, if E-MAC change is ignored */
1430 if (priv->no_avb_link)
1431 ravb_rcv_snd_disable(ndev);
1432
1433 if (phydev->link) {
1434 if (info->half_duplex && phydev->duplex != priv->duplex) {
1435 new_state = true;
1436 priv->duplex = phydev->duplex;
1437 ravb_set_duplex_gbeth(ndev);
1438 }
1439
1440 if (phydev->speed != priv->speed) {
1441 new_state = true;
1442 priv->speed = phydev->speed;
1443 info->set_rate(ndev);
1444 }
1445 if (!priv->link) {
1446 ravb_modify(ndev, ECMR, ECMR_TXF, 0);
1447 new_state = true;
1448 priv->link = phydev->link;
1449 }
1450 } else if (priv->link) {
1451 new_state = true;
1452 priv->link = 0;
1453 priv->speed = 0;
1454 if (info->half_duplex)
1455 priv->duplex = -1;
1456 }
1457
1458 /* Enable TX and RX right over here, if E-MAC change is ignored */
1459 if (priv->no_avb_link && phydev->link)
1460 ravb_rcv_snd_enable(ndev);
1461
1462 spin_unlock_irqrestore(&priv->lock, flags);
1463
1464 if (new_state && netif_msg_link(priv))
1465 phy_print_status(phydev);
1466}
1467
1468/* PHY init function */
1469static int ravb_phy_init(struct net_device *ndev)
1470{
1471 struct device_node *np = ndev->dev.parent->of_node;
1472 struct ravb_private *priv = netdev_priv(ndev);
1473 const struct ravb_hw_info *info = priv->info;
1474 struct phy_device *phydev;
1475 struct device_node *pn;
1476 phy_interface_t iface;
1477 int err;
1478
1479 priv->link = 0;
1480 priv->speed = 0;
1481 priv->duplex = -1;
1482
1483 /* Try connecting to PHY */
1484 pn = of_parse_phandle(np, "phy-handle", 0);
1485 if (!pn) {
1486 /* In the case of a fixed PHY, the DT node associated
1487 * to the PHY is the Ethernet MAC DT node.
1488 */
1489 if (of_phy_is_fixed_link(np)) {
1490 err = of_phy_register_fixed_link(np);
1491 if (err)
1492 return err;
1493 }
1494 pn = of_node_get(np);
1495 }
1496
1497 iface = priv->rgmii_override ? PHY_INTERFACE_MODE_RGMII
1498 : priv->phy_interface;
1499 phydev = of_phy_connect(ndev, pn, ravb_adjust_link, 0, iface);
1500 of_node_put(pn);
1501 if (!phydev) {
1502 netdev_err(ndev, "failed to connect PHY\n");
1503 err = -ENOENT;
1504 goto err_deregister_fixed_link;
1505 }
1506
1507 if (!info->half_duplex) {
1508 /* 10BASE, Pause and Asym Pause is not supported */
1509 phy_remove_link_mode(phydev, ETHTOOL_LINK_MODE_10baseT_Half_BIT);
1510 phy_remove_link_mode(phydev, ETHTOOL_LINK_MODE_10baseT_Full_BIT);
1511 phy_remove_link_mode(phydev, ETHTOOL_LINK_MODE_Pause_BIT);
1512 phy_remove_link_mode(phydev, ETHTOOL_LINK_MODE_Asym_Pause_BIT);
1513
1514 /* Half Duplex is not supported */
1515 phy_remove_link_mode(phydev, ETHTOOL_LINK_MODE_1000baseT_Half_BIT);
1516 phy_remove_link_mode(phydev, ETHTOOL_LINK_MODE_100baseT_Half_BIT);
1517 }
1518
1519 phy_attached_info(phydev);
1520
1521 return 0;
1522
1523err_deregister_fixed_link:
1524 if (of_phy_is_fixed_link(np))
1525 of_phy_deregister_fixed_link(np);
1526
1527 return err;
1528}
1529
1530/* PHY control start function */
1531static int ravb_phy_start(struct net_device *ndev)
1532{
1533 int error;
1534
1535 error = ravb_phy_init(ndev);
1536 if (error)
1537 return error;
1538
1539 phy_start(ndev->phydev);
1540
1541 return 0;
1542}
1543
1544static u32 ravb_get_msglevel(struct net_device *ndev)
1545{
1546 struct ravb_private *priv = netdev_priv(ndev);
1547
1548 return priv->msg_enable;
1549}
1550
1551static void ravb_set_msglevel(struct net_device *ndev, u32 value)
1552{
1553 struct ravb_private *priv = netdev_priv(ndev);
1554
1555 priv->msg_enable = value;
1556}
1557
1558static const char ravb_gstrings_stats_gbeth[][ETH_GSTRING_LEN] = {
1559 "rx_queue_0_current",
1560 "tx_queue_0_current",
1561 "rx_queue_0_dirty",
1562 "tx_queue_0_dirty",
1563 "rx_queue_0_packets",
1564 "tx_queue_0_packets",
1565 "rx_queue_0_bytes",
1566 "tx_queue_0_bytes",
1567 "rx_queue_0_mcast_packets",
1568 "rx_queue_0_errors",
1569 "rx_queue_0_crc_errors",
1570 "rx_queue_0_frame_errors",
1571 "rx_queue_0_length_errors",
1572 "rx_queue_0_csum_offload_errors",
1573 "rx_queue_0_over_errors",
1574};
1575
1576static const char ravb_gstrings_stats[][ETH_GSTRING_LEN] = {
1577 "rx_queue_0_current",
1578 "tx_queue_0_current",
1579 "rx_queue_0_dirty",
1580 "tx_queue_0_dirty",
1581 "rx_queue_0_packets",
1582 "tx_queue_0_packets",
1583 "rx_queue_0_bytes",
1584 "tx_queue_0_bytes",
1585 "rx_queue_0_mcast_packets",
1586 "rx_queue_0_errors",
1587 "rx_queue_0_crc_errors",
1588 "rx_queue_0_frame_errors",
1589 "rx_queue_0_length_errors",
1590 "rx_queue_0_missed_errors",
1591 "rx_queue_0_over_errors",
1592
1593 "rx_queue_1_current",
1594 "tx_queue_1_current",
1595 "rx_queue_1_dirty",
1596 "tx_queue_1_dirty",
1597 "rx_queue_1_packets",
1598 "tx_queue_1_packets",
1599 "rx_queue_1_bytes",
1600 "tx_queue_1_bytes",
1601 "rx_queue_1_mcast_packets",
1602 "rx_queue_1_errors",
1603 "rx_queue_1_crc_errors",
1604 "rx_queue_1_frame_errors",
1605 "rx_queue_1_length_errors",
1606 "rx_queue_1_missed_errors",
1607 "rx_queue_1_over_errors",
1608};
1609
1610static int ravb_get_sset_count(struct net_device *netdev, int sset)
1611{
1612 struct ravb_private *priv = netdev_priv(netdev);
1613 const struct ravb_hw_info *info = priv->info;
1614
1615 switch (sset) {
1616 case ETH_SS_STATS:
1617 return info->stats_len;
1618 default:
1619 return -EOPNOTSUPP;
1620 }
1621}
1622
1623static void ravb_get_ethtool_stats(struct net_device *ndev,
1624 struct ethtool_stats *estats, u64 *data)
1625{
1626 struct ravb_private *priv = netdev_priv(ndev);
1627 const struct ravb_hw_info *info = priv->info;
1628 int num_rx_q;
1629 int i = 0;
1630 int q;
1631
1632 num_rx_q = info->nc_queues ? NUM_RX_QUEUE : 1;
1633 /* Device-specific stats */
1634 for (q = RAVB_BE; q < num_rx_q; q++) {
1635 struct net_device_stats *stats = &priv->stats[q];
1636
1637 data[i++] = priv->cur_rx[q];
1638 data[i++] = priv->cur_tx[q];
1639 data[i++] = priv->dirty_rx[q];
1640 data[i++] = priv->dirty_tx[q];
1641 data[i++] = stats->rx_packets;
1642 data[i++] = stats->tx_packets;
1643 data[i++] = stats->rx_bytes;
1644 data[i++] = stats->tx_bytes;
1645 data[i++] = stats->multicast;
1646 data[i++] = stats->rx_errors;
1647 data[i++] = stats->rx_crc_errors;
1648 data[i++] = stats->rx_frame_errors;
1649 data[i++] = stats->rx_length_errors;
1650 data[i++] = stats->rx_missed_errors;
1651 data[i++] = stats->rx_over_errors;
1652 }
1653}
1654
1655static void ravb_get_strings(struct net_device *ndev, u32 stringset, u8 *data)
1656{
1657 struct ravb_private *priv = netdev_priv(ndev);
1658 const struct ravb_hw_info *info = priv->info;
1659
1660 switch (stringset) {
1661 case ETH_SS_STATS:
1662 memcpy(data, info->gstrings_stats, info->gstrings_size);
1663 break;
1664 }
1665}
1666
1667static void ravb_get_ringparam(struct net_device *ndev,
1668 struct ethtool_ringparam *ring,
1669 struct kernel_ethtool_ringparam *kernel_ring,
1670 struct netlink_ext_ack *extack)
1671{
1672 struct ravb_private *priv = netdev_priv(ndev);
1673
1674 ring->rx_max_pending = BE_RX_RING_MAX;
1675 ring->tx_max_pending = BE_TX_RING_MAX;
1676 ring->rx_pending = priv->num_rx_ring[RAVB_BE];
1677 ring->tx_pending = priv->num_tx_ring[RAVB_BE];
1678}
1679
1680static int ravb_set_ringparam(struct net_device *ndev,
1681 struct ethtool_ringparam *ring,
1682 struct kernel_ethtool_ringparam *kernel_ring,
1683 struct netlink_ext_ack *extack)
1684{
1685 struct ravb_private *priv = netdev_priv(ndev);
1686 const struct ravb_hw_info *info = priv->info;
1687 int error;
1688
1689 if (ring->tx_pending > BE_TX_RING_MAX ||
1690 ring->rx_pending > BE_RX_RING_MAX ||
1691 ring->tx_pending < BE_TX_RING_MIN ||
1692 ring->rx_pending < BE_RX_RING_MIN)
1693 return -EINVAL;
1694 if (ring->rx_mini_pending || ring->rx_jumbo_pending)
1695 return -EINVAL;
1696
1697 if (netif_running(ndev)) {
1698 netif_device_detach(ndev);
1699 /* Stop PTP Clock driver */
1700 if (info->gptp)
1701 ravb_ptp_stop(ndev);
1702 /* Wait for DMA stopping */
1703 error = ravb_stop_dma(ndev);
1704 if (error) {
1705 netdev_err(ndev,
1706 "cannot set ringparam! Any AVB processes are still running?\n");
1707 return error;
1708 }
1709 synchronize_irq(ndev->irq);
1710
1711 /* Free all the skb's in the RX queue and the DMA buffers. */
1712 ravb_ring_free(ndev, RAVB_BE);
1713 if (info->nc_queues)
1714 ravb_ring_free(ndev, RAVB_NC);
1715 }
1716
1717 /* Set new parameters */
1718 priv->num_rx_ring[RAVB_BE] = ring->rx_pending;
1719 priv->num_tx_ring[RAVB_BE] = ring->tx_pending;
1720
1721 if (netif_running(ndev)) {
1722 error = ravb_dmac_init(ndev);
1723 if (error) {
1724 netdev_err(ndev,
1725 "%s: ravb_dmac_init() failed, error %d\n",
1726 __func__, error);
1727 return error;
1728 }
1729
1730 ravb_emac_init(ndev);
1731
1732 /* Initialise PTP Clock driver */
1733 if (info->gptp)
1734 ravb_ptp_init(ndev, priv->pdev);
1735
1736 netif_device_attach(ndev);
1737 }
1738
1739 return 0;
1740}
1741
1742static int ravb_get_ts_info(struct net_device *ndev,
1743 struct kernel_ethtool_ts_info *info)
1744{
1745 struct ravb_private *priv = netdev_priv(ndev);
1746 const struct ravb_hw_info *hw_info = priv->info;
1747
1748 if (hw_info->gptp || hw_info->ccc_gac) {
1749 info->so_timestamping =
1750 SOF_TIMESTAMPING_TX_SOFTWARE |
1751 SOF_TIMESTAMPING_TX_HARDWARE |
1752 SOF_TIMESTAMPING_RX_HARDWARE |
1753 SOF_TIMESTAMPING_RAW_HARDWARE;
1754 info->tx_types = (1 << HWTSTAMP_TX_OFF) | (1 << HWTSTAMP_TX_ON);
1755 info->rx_filters =
1756 (1 << HWTSTAMP_FILTER_NONE) |
1757 (1 << HWTSTAMP_FILTER_PTP_V2_L2_EVENT) |
1758 (1 << HWTSTAMP_FILTER_ALL);
1759 info->phc_index = ptp_clock_index(priv->ptp.clock);
1760 }
1761
1762 return 0;
1763}
1764
1765static void ravb_get_wol(struct net_device *ndev, struct ethtool_wolinfo *wol)
1766{
1767 struct ravb_private *priv = netdev_priv(ndev);
1768
1769 wol->supported = WAKE_MAGIC;
1770 wol->wolopts = priv->wol_enabled ? WAKE_MAGIC : 0;
1771}
1772
1773static int ravb_set_wol(struct net_device *ndev, struct ethtool_wolinfo *wol)
1774{
1775 struct ravb_private *priv = netdev_priv(ndev);
1776 const struct ravb_hw_info *info = priv->info;
1777
1778 if (!info->magic_pkt || (wol->wolopts & ~WAKE_MAGIC))
1779 return -EOPNOTSUPP;
1780
1781 priv->wol_enabled = !!(wol->wolopts & WAKE_MAGIC);
1782
1783 device_set_wakeup_enable(&priv->pdev->dev, priv->wol_enabled);
1784
1785 return 0;
1786}
1787
1788static const struct ethtool_ops ravb_ethtool_ops = {
1789 .nway_reset = phy_ethtool_nway_reset,
1790 .get_msglevel = ravb_get_msglevel,
1791 .set_msglevel = ravb_set_msglevel,
1792 .get_link = ethtool_op_get_link,
1793 .get_strings = ravb_get_strings,
1794 .get_ethtool_stats = ravb_get_ethtool_stats,
1795 .get_sset_count = ravb_get_sset_count,
1796 .get_ringparam = ravb_get_ringparam,
1797 .set_ringparam = ravb_set_ringparam,
1798 .get_ts_info = ravb_get_ts_info,
1799 .get_link_ksettings = phy_ethtool_get_link_ksettings,
1800 .set_link_ksettings = phy_ethtool_set_link_ksettings,
1801 .get_wol = ravb_get_wol,
1802 .set_wol = ravb_set_wol,
1803};
1804
1805static int ravb_set_config_mode(struct net_device *ndev)
1806{
1807 struct ravb_private *priv = netdev_priv(ndev);
1808 const struct ravb_hw_info *info = priv->info;
1809 int error;
1810
1811 if (info->gptp) {
1812 error = ravb_set_opmode(ndev, CCC_OPC_CONFIG);
1813 if (error)
1814 return error;
1815 /* Set CSEL value */
1816 ravb_modify(ndev, CCC, CCC_CSEL, CCC_CSEL_HPB);
1817 } else if (info->ccc_gac) {
1818 error = ravb_set_opmode(ndev, CCC_OPC_CONFIG | CCC_GAC | CCC_CSEL_HPB);
1819 } else {
1820 error = ravb_set_opmode(ndev, CCC_OPC_CONFIG);
1821 }
1822
1823 return error;
1824}
1825
1826static void ravb_set_gti(struct net_device *ndev)
1827{
1828 struct ravb_private *priv = netdev_priv(ndev);
1829 const struct ravb_hw_info *info = priv->info;
1830
1831 if (!(info->gptp || info->ccc_gac))
1832 return;
1833
1834 ravb_write(ndev, priv->gti_tiv, GTI);
1835
1836 /* Request GTI loading */
1837 ravb_modify(ndev, GCCR, GCCR_LTI, GCCR_LTI);
1838}
1839
1840static int ravb_compute_gti(struct net_device *ndev)
1841{
1842 struct ravb_private *priv = netdev_priv(ndev);
1843 const struct ravb_hw_info *info = priv->info;
1844 struct device *dev = ndev->dev.parent;
1845 unsigned long rate;
1846 u64 inc;
1847
1848 if (!(info->gptp || info->ccc_gac))
1849 return 0;
1850
1851 if (info->gptp_ref_clk)
1852 rate = clk_get_rate(priv->gptp_clk);
1853 else
1854 rate = clk_get_rate(priv->clk);
1855 if (!rate)
1856 return -EINVAL;
1857
1858 inc = div64_ul(1000000000ULL << 20, rate);
1859
1860 if (inc < GTI_TIV_MIN || inc > GTI_TIV_MAX) {
1861 dev_err(dev, "gti.tiv increment 0x%llx is outside the range 0x%x - 0x%x\n",
1862 inc, GTI_TIV_MIN, GTI_TIV_MAX);
1863 return -EINVAL;
1864 }
1865 priv->gti_tiv = inc;
1866
1867 return 0;
1868}
1869
1870/* Set tx and rx clock internal delay modes */
1871static void ravb_parse_delay_mode(struct device_node *np, struct net_device *ndev)
1872{
1873 struct ravb_private *priv = netdev_priv(ndev);
1874 bool explicit_delay = false;
1875 u32 delay;
1876
1877 if (!priv->info->internal_delay)
1878 return;
1879
1880 if (!of_property_read_u32(np, "rx-internal-delay-ps", &delay)) {
1881 /* Valid values are 0 and 1800, according to DT bindings */
1882 priv->rxcidm = !!delay;
1883 explicit_delay = true;
1884 }
1885 if (!of_property_read_u32(np, "tx-internal-delay-ps", &delay)) {
1886 /* Valid values are 0 and 2000, according to DT bindings */
1887 priv->txcidm = !!delay;
1888 explicit_delay = true;
1889 }
1890
1891 if (explicit_delay)
1892 return;
1893
1894 /* Fall back to legacy rgmii-*id behavior */
1895 if (priv->phy_interface == PHY_INTERFACE_MODE_RGMII_ID ||
1896 priv->phy_interface == PHY_INTERFACE_MODE_RGMII_RXID) {
1897 priv->rxcidm = 1;
1898 priv->rgmii_override = 1;
1899 }
1900
1901 if (priv->phy_interface == PHY_INTERFACE_MODE_RGMII_ID ||
1902 priv->phy_interface == PHY_INTERFACE_MODE_RGMII_TXID) {
1903 priv->txcidm = 1;
1904 priv->rgmii_override = 1;
1905 }
1906}
1907
1908static void ravb_set_delay_mode(struct net_device *ndev)
1909{
1910 struct ravb_private *priv = netdev_priv(ndev);
1911 u32 set = 0;
1912
1913 if (!priv->info->internal_delay)
1914 return;
1915
1916 if (priv->rxcidm)
1917 set |= APSR_RDM;
1918 if (priv->txcidm)
1919 set |= APSR_TDM;
1920 ravb_modify(ndev, APSR, APSR_RDM | APSR_TDM, set);
1921}
1922
1923/* Network device open function for Ethernet AVB */
1924static int ravb_open(struct net_device *ndev)
1925{
1926 struct ravb_private *priv = netdev_priv(ndev);
1927 const struct ravb_hw_info *info = priv->info;
1928 struct device *dev = &priv->pdev->dev;
1929 int error;
1930
1931 napi_enable(&priv->napi[RAVB_BE]);
1932 if (info->nc_queues)
1933 napi_enable(&priv->napi[RAVB_NC]);
1934
1935 error = pm_runtime_resume_and_get(dev);
1936 if (error < 0)
1937 goto out_napi_off;
1938
1939 /* Set AVB config mode */
1940 error = ravb_set_config_mode(ndev);
1941 if (error)
1942 goto out_rpm_put;
1943
1944 ravb_set_delay_mode(ndev);
1945 ravb_write(ndev, priv->desc_bat_dma, DBAT);
1946
1947 /* Device init */
1948 error = ravb_dmac_init(ndev);
1949 if (error)
1950 goto out_set_reset;
1951
1952 ravb_emac_init(ndev);
1953
1954 ravb_set_gti(ndev);
1955
1956 /* Initialise PTP Clock driver */
1957 if (info->gptp || info->ccc_gac)
1958 ravb_ptp_init(ndev, priv->pdev);
1959
1960 /* PHY control start */
1961 error = ravb_phy_start(ndev);
1962 if (error)
1963 goto out_ptp_stop;
1964
1965 netif_tx_start_all_queues(ndev);
1966
1967 return 0;
1968
1969out_ptp_stop:
1970 /* Stop PTP Clock driver */
1971 if (info->gptp || info->ccc_gac)
1972 ravb_ptp_stop(ndev);
1973 ravb_stop_dma(ndev);
1974out_set_reset:
1975 ravb_set_opmode(ndev, CCC_OPC_RESET);
1976out_rpm_put:
1977 pm_runtime_mark_last_busy(dev);
1978 pm_runtime_put_autosuspend(dev);
1979out_napi_off:
1980 if (info->nc_queues)
1981 napi_disable(&priv->napi[RAVB_NC]);
1982 napi_disable(&priv->napi[RAVB_BE]);
1983 return error;
1984}
1985
1986/* Timeout function for Ethernet AVB */
1987static void ravb_tx_timeout(struct net_device *ndev, unsigned int txqueue)
1988{
1989 struct ravb_private *priv = netdev_priv(ndev);
1990
1991 netif_err(priv, tx_err, ndev,
1992 "transmit timed out, status %08x, resetting...\n",
1993 ravb_read(ndev, ISS));
1994
1995 /* tx_errors count up */
1996 ndev->stats.tx_errors++;
1997
1998 schedule_work(&priv->work);
1999}
2000
2001static void ravb_tx_timeout_work(struct work_struct *work)
2002{
2003 struct ravb_private *priv = container_of(work, struct ravb_private,
2004 work);
2005 const struct ravb_hw_info *info = priv->info;
2006 struct net_device *ndev = priv->ndev;
2007 int error;
2008
2009 if (!rtnl_trylock()) {
2010 usleep_range(1000, 2000);
2011 schedule_work(&priv->work);
2012 return;
2013 }
2014
2015 netif_tx_stop_all_queues(ndev);
2016
2017 /* Stop PTP Clock driver */
2018 if (info->gptp)
2019 ravb_ptp_stop(ndev);
2020
2021 /* Wait for DMA stopping */
2022 if (ravb_stop_dma(ndev)) {
2023 /* If ravb_stop_dma() fails, the hardware is still operating
2024 * for TX and/or RX. So, this should not call the following
2025 * functions because ravb_dmac_init() is possible to fail too.
2026 * Also, this should not retry ravb_stop_dma() again and again
2027 * here because it's possible to wait forever. So, this just
2028 * re-enables the TX and RX and skip the following
2029 * re-initialization procedure.
2030 */
2031 ravb_rcv_snd_enable(ndev);
2032 goto out;
2033 }
2034
2035 ravb_ring_free(ndev, RAVB_BE);
2036 if (info->nc_queues)
2037 ravb_ring_free(ndev, RAVB_NC);
2038
2039 /* Device init */
2040 error = ravb_dmac_init(ndev);
2041 if (error) {
2042 /* If ravb_dmac_init() fails, descriptors are freed. So, this
2043 * should return here to avoid re-enabling the TX and RX in
2044 * ravb_emac_init().
2045 */
2046 netdev_err(ndev, "%s: ravb_dmac_init() failed, error %d\n",
2047 __func__, error);
2048 goto out_unlock;
2049 }
2050 ravb_emac_init(ndev);
2051
2052out:
2053 /* Initialise PTP Clock driver */
2054 if (info->gptp)
2055 ravb_ptp_init(ndev, priv->pdev);
2056
2057 netif_tx_start_all_queues(ndev);
2058
2059out_unlock:
2060 rtnl_unlock();
2061}
2062
2063static bool ravb_can_tx_csum_gbeth(struct sk_buff *skb)
2064{
2065 u16 net_protocol = ntohs(skb->protocol);
2066 u8 inner_protocol;
2067
2068 /* GbEth IP can calculate the checksum if:
2069 * - there are zero or one VLAN headers with TPID=0x8100
2070 * - the network protocol is IPv4 or IPv6
2071 * - the transport protocol is TCP, UDP or ICMP
2072 * - the packet is not fragmented
2073 */
2074
2075 if (net_protocol == ETH_P_8021Q) {
2076 struct vlan_hdr vhdr, *vh;
2077
2078 vh = skb_header_pointer(skb, ETH_HLEN, sizeof(vhdr), &vhdr);
2079 if (!vh)
2080 return false;
2081
2082 net_protocol = ntohs(vh->h_vlan_encapsulated_proto);
2083 }
2084
2085 switch (net_protocol) {
2086 case ETH_P_IP:
2087 inner_protocol = ip_hdr(skb)->protocol;
2088 break;
2089 case ETH_P_IPV6:
2090 inner_protocol = ipv6_hdr(skb)->nexthdr;
2091 break;
2092 default:
2093 return false;
2094 }
2095
2096 switch (inner_protocol) {
2097 case IPPROTO_TCP:
2098 case IPPROTO_UDP:
2099 return true;
2100 default:
2101 return false;
2102 }
2103}
2104
2105/* Packet transmit function for Ethernet AVB */
2106static netdev_tx_t ravb_start_xmit(struct sk_buff *skb, struct net_device *ndev)
2107{
2108 struct ravb_private *priv = netdev_priv(ndev);
2109 const struct ravb_hw_info *info = priv->info;
2110 unsigned int num_tx_desc = priv->num_tx_desc;
2111 u16 q = skb_get_queue_mapping(skb);
2112 struct ravb_tstamp_skb *ts_skb;
2113 struct ravb_tx_desc *desc;
2114 unsigned long flags;
2115 dma_addr_t dma_addr;
2116 void *buffer;
2117 u32 entry;
2118 u32 len;
2119
2120 if (skb->ip_summed == CHECKSUM_PARTIAL && !ravb_can_tx_csum_gbeth(skb))
2121 skb_checksum_help(skb);
2122
2123 spin_lock_irqsave(&priv->lock, flags);
2124 if (priv->cur_tx[q] - priv->dirty_tx[q] > (priv->num_tx_ring[q] - 1) *
2125 num_tx_desc) {
2126 netif_err(priv, tx_queued, ndev,
2127 "still transmitting with the full ring!\n");
2128 netif_stop_subqueue(ndev, q);
2129 spin_unlock_irqrestore(&priv->lock, flags);
2130 return NETDEV_TX_BUSY;
2131 }
2132
2133 if (skb_put_padto(skb, ETH_ZLEN))
2134 goto exit;
2135
2136 entry = priv->cur_tx[q] % (priv->num_tx_ring[q] * num_tx_desc);
2137 priv->tx_skb[q][entry / num_tx_desc] = skb;
2138
2139 if (num_tx_desc > 1) {
2140 buffer = PTR_ALIGN(priv->tx_align[q], DPTR_ALIGN) +
2141 entry / num_tx_desc * DPTR_ALIGN;
2142 len = PTR_ALIGN(skb->data, DPTR_ALIGN) - skb->data;
2143
2144 /* Zero length DMA descriptors are problematic as they seem
2145 * to terminate DMA transfers. Avoid them by simply using a
2146 * length of DPTR_ALIGN (4) when skb data is aligned to
2147 * DPTR_ALIGN.
2148 *
2149 * As skb is guaranteed to have at least ETH_ZLEN (60)
2150 * bytes of data by the call to skb_put_padto() above this
2151 * is safe with respect to both the length of the first DMA
2152 * descriptor (len) overflowing the available data and the
2153 * length of the second DMA descriptor (skb->len - len)
2154 * being negative.
2155 */
2156 if (len == 0)
2157 len = DPTR_ALIGN;
2158
2159 memcpy(buffer, skb->data, len);
2160 dma_addr = dma_map_single(ndev->dev.parent, buffer, len,
2161 DMA_TO_DEVICE);
2162 if (dma_mapping_error(ndev->dev.parent, dma_addr))
2163 goto drop;
2164
2165 desc = &priv->tx_ring[q][entry];
2166 desc->ds_tagl = cpu_to_le16(len);
2167 desc->dptr = cpu_to_le32(dma_addr);
2168
2169 buffer = skb->data + len;
2170 len = skb->len - len;
2171 dma_addr = dma_map_single(ndev->dev.parent, buffer, len,
2172 DMA_TO_DEVICE);
2173 if (dma_mapping_error(ndev->dev.parent, dma_addr))
2174 goto unmap;
2175
2176 desc++;
2177 } else {
2178 desc = &priv->tx_ring[q][entry];
2179 len = skb->len;
2180 dma_addr = dma_map_single(ndev->dev.parent, skb->data, skb->len,
2181 DMA_TO_DEVICE);
2182 if (dma_mapping_error(ndev->dev.parent, dma_addr))
2183 goto drop;
2184 }
2185 desc->ds_tagl = cpu_to_le16(len);
2186 desc->dptr = cpu_to_le32(dma_addr);
2187
2188 /* TX timestamp required */
2189 if (info->gptp || info->ccc_gac) {
2190 if (q == RAVB_NC) {
2191 ts_skb = kmalloc(sizeof(*ts_skb), GFP_ATOMIC);
2192 if (!ts_skb) {
2193 if (num_tx_desc > 1) {
2194 desc--;
2195 dma_unmap_single(ndev->dev.parent, dma_addr,
2196 len, DMA_TO_DEVICE);
2197 }
2198 goto unmap;
2199 }
2200 ts_skb->skb = skb_get(skb);
2201 ts_skb->tag = priv->ts_skb_tag++;
2202 priv->ts_skb_tag &= 0x3ff;
2203 list_add_tail(&ts_skb->list, &priv->ts_skb_list);
2204
2205 /* TAG and timestamp required flag */
2206 skb_shinfo(skb)->tx_flags |= SKBTX_IN_PROGRESS;
2207 desc->tagh_tsr = (ts_skb->tag >> 4) | TX_TSR;
2208 desc->ds_tagl |= cpu_to_le16(ts_skb->tag << 12);
2209 }
2210
2211 skb_tx_timestamp(skb);
2212 }
2213 /* Descriptor type must be set after all the above writes */
2214 dma_wmb();
2215 if (num_tx_desc > 1) {
2216 desc->die_dt = DT_FEND;
2217 desc--;
2218 desc->die_dt = DT_FSTART;
2219 } else {
2220 desc->die_dt = DT_FSINGLE;
2221 }
2222 ravb_modify(ndev, TCCR, TCCR_TSRQ0 << q, TCCR_TSRQ0 << q);
2223
2224 priv->cur_tx[q] += num_tx_desc;
2225 if (priv->cur_tx[q] - priv->dirty_tx[q] >
2226 (priv->num_tx_ring[q] - 1) * num_tx_desc &&
2227 !ravb_tx_free(ndev, q, true))
2228 netif_stop_subqueue(ndev, q);
2229
2230exit:
2231 spin_unlock_irqrestore(&priv->lock, flags);
2232 return NETDEV_TX_OK;
2233
2234unmap:
2235 dma_unmap_single(ndev->dev.parent, le32_to_cpu(desc->dptr),
2236 le16_to_cpu(desc->ds_tagl), DMA_TO_DEVICE);
2237drop:
2238 dev_kfree_skb_any(skb);
2239 priv->tx_skb[q][entry / num_tx_desc] = NULL;
2240 goto exit;
2241}
2242
2243static u16 ravb_select_queue(struct net_device *ndev, struct sk_buff *skb,
2244 struct net_device *sb_dev)
2245{
2246 /* If skb needs TX timestamp, it is handled in network control queue */
2247 return (skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP) ? RAVB_NC :
2248 RAVB_BE;
2249
2250}
2251
2252static struct net_device_stats *ravb_get_stats(struct net_device *ndev)
2253{
2254 struct ravb_private *priv = netdev_priv(ndev);
2255 const struct ravb_hw_info *info = priv->info;
2256 struct net_device_stats *nstats, *stats0, *stats1;
2257 struct device *dev = &priv->pdev->dev;
2258
2259 nstats = &ndev->stats;
2260
2261 pm_runtime_get_noresume(dev);
2262
2263 if (!pm_runtime_active(dev))
2264 goto out_rpm_put;
2265
2266 stats0 = &priv->stats[RAVB_BE];
2267
2268 if (info->tx_counters) {
2269 nstats->tx_dropped += ravb_read(ndev, TROCR);
2270 ravb_write(ndev, 0, TROCR); /* (write clear) */
2271 }
2272
2273 if (info->carrier_counters) {
2274 nstats->collisions += ravb_read(ndev, CXR41);
2275 ravb_write(ndev, 0, CXR41); /* (write clear) */
2276 nstats->tx_carrier_errors += ravb_read(ndev, CXR42);
2277 ravb_write(ndev, 0, CXR42); /* (write clear) */
2278 }
2279
2280 nstats->rx_packets = stats0->rx_packets;
2281 nstats->tx_packets = stats0->tx_packets;
2282 nstats->rx_bytes = stats0->rx_bytes;
2283 nstats->tx_bytes = stats0->tx_bytes;
2284 nstats->multicast = stats0->multicast;
2285 nstats->rx_errors = stats0->rx_errors;
2286 nstats->rx_crc_errors = stats0->rx_crc_errors;
2287 nstats->rx_frame_errors = stats0->rx_frame_errors;
2288 nstats->rx_length_errors = stats0->rx_length_errors;
2289 nstats->rx_missed_errors = stats0->rx_missed_errors;
2290 nstats->rx_over_errors = stats0->rx_over_errors;
2291 if (info->nc_queues) {
2292 stats1 = &priv->stats[RAVB_NC];
2293
2294 nstats->rx_packets += stats1->rx_packets;
2295 nstats->tx_packets += stats1->tx_packets;
2296 nstats->rx_bytes += stats1->rx_bytes;
2297 nstats->tx_bytes += stats1->tx_bytes;
2298 nstats->multicast += stats1->multicast;
2299 nstats->rx_errors += stats1->rx_errors;
2300 nstats->rx_crc_errors += stats1->rx_crc_errors;
2301 nstats->rx_frame_errors += stats1->rx_frame_errors;
2302 nstats->rx_length_errors += stats1->rx_length_errors;
2303 nstats->rx_missed_errors += stats1->rx_missed_errors;
2304 nstats->rx_over_errors += stats1->rx_over_errors;
2305 }
2306
2307out_rpm_put:
2308 pm_runtime_put_noidle(dev);
2309 return nstats;
2310}
2311
2312/* Update promiscuous bit */
2313static void ravb_set_rx_mode(struct net_device *ndev)
2314{
2315 struct ravb_private *priv = netdev_priv(ndev);
2316 unsigned long flags;
2317
2318 spin_lock_irqsave(&priv->lock, flags);
2319 ravb_modify(ndev, ECMR, ECMR_PRM,
2320 ndev->flags & IFF_PROMISC ? ECMR_PRM : 0);
2321 spin_unlock_irqrestore(&priv->lock, flags);
2322}
2323
2324/* Device close function for Ethernet AVB */
2325static int ravb_close(struct net_device *ndev)
2326{
2327 struct device_node *np = ndev->dev.parent->of_node;
2328 struct ravb_private *priv = netdev_priv(ndev);
2329 const struct ravb_hw_info *info = priv->info;
2330 struct ravb_tstamp_skb *ts_skb, *ts_skb2;
2331 struct device *dev = &priv->pdev->dev;
2332 int error;
2333
2334 netif_tx_stop_all_queues(ndev);
2335
2336 /* Disable interrupts by clearing the interrupt masks. */
2337 ravb_write(ndev, 0, RIC0);
2338 ravb_write(ndev, 0, RIC2);
2339 ravb_write(ndev, 0, TIC);
2340
2341 /* PHY disconnect */
2342 if (ndev->phydev) {
2343 phy_stop(ndev->phydev);
2344 phy_disconnect(ndev->phydev);
2345 if (of_phy_is_fixed_link(np))
2346 of_phy_deregister_fixed_link(np);
2347 }
2348
2349 /* Stop PTP Clock driver */
2350 if (info->gptp || info->ccc_gac)
2351 ravb_ptp_stop(ndev);
2352
2353 /* Set the config mode to stop the AVB-DMAC's processes */
2354 if (ravb_stop_dma(ndev) < 0)
2355 netdev_err(ndev,
2356 "device will be stopped after h/w processes are done.\n");
2357
2358 /* Clear the timestamp list */
2359 if (info->gptp || info->ccc_gac) {
2360 list_for_each_entry_safe(ts_skb, ts_skb2, &priv->ts_skb_list, list) {
2361 list_del(&ts_skb->list);
2362 kfree_skb(ts_skb->skb);
2363 kfree(ts_skb);
2364 }
2365 }
2366
2367 cancel_work_sync(&priv->work);
2368
2369 if (info->nc_queues)
2370 napi_disable(&priv->napi[RAVB_NC]);
2371 napi_disable(&priv->napi[RAVB_BE]);
2372
2373 /* Free all the skb's in the RX queue and the DMA buffers. */
2374 ravb_ring_free(ndev, RAVB_BE);
2375 if (info->nc_queues)
2376 ravb_ring_free(ndev, RAVB_NC);
2377
2378 /* Update statistics. */
2379 ravb_get_stats(ndev);
2380
2381 /* Set reset mode. */
2382 error = ravb_set_opmode(ndev, CCC_OPC_RESET);
2383 if (error)
2384 return error;
2385
2386 pm_runtime_mark_last_busy(dev);
2387 pm_runtime_put_autosuspend(dev);
2388
2389 return 0;
2390}
2391
2392static int ravb_hwtstamp_get(struct net_device *ndev, struct ifreq *req)
2393{
2394 struct ravb_private *priv = netdev_priv(ndev);
2395 struct hwtstamp_config config;
2396
2397 config.flags = 0;
2398 config.tx_type = priv->tstamp_tx_ctrl ? HWTSTAMP_TX_ON :
2399 HWTSTAMP_TX_OFF;
2400 switch (priv->tstamp_rx_ctrl & RAVB_RXTSTAMP_TYPE) {
2401 case RAVB_RXTSTAMP_TYPE_V2_L2_EVENT:
2402 config.rx_filter = HWTSTAMP_FILTER_PTP_V2_L2_EVENT;
2403 break;
2404 case RAVB_RXTSTAMP_TYPE_ALL:
2405 config.rx_filter = HWTSTAMP_FILTER_ALL;
2406 break;
2407 default:
2408 config.rx_filter = HWTSTAMP_FILTER_NONE;
2409 }
2410
2411 return copy_to_user(req->ifr_data, &config, sizeof(config)) ?
2412 -EFAULT : 0;
2413}
2414
2415/* Control hardware time stamping */
2416static int ravb_hwtstamp_set(struct net_device *ndev, struct ifreq *req)
2417{
2418 struct ravb_private *priv = netdev_priv(ndev);
2419 struct hwtstamp_config config;
2420 u32 tstamp_rx_ctrl = RAVB_RXTSTAMP_ENABLED;
2421 u32 tstamp_tx_ctrl;
2422
2423 if (copy_from_user(&config, req->ifr_data, sizeof(config)))
2424 return -EFAULT;
2425
2426 switch (config.tx_type) {
2427 case HWTSTAMP_TX_OFF:
2428 tstamp_tx_ctrl = 0;
2429 break;
2430 case HWTSTAMP_TX_ON:
2431 tstamp_tx_ctrl = RAVB_TXTSTAMP_ENABLED;
2432 break;
2433 default:
2434 return -ERANGE;
2435 }
2436
2437 switch (config.rx_filter) {
2438 case HWTSTAMP_FILTER_NONE:
2439 tstamp_rx_ctrl = 0;
2440 break;
2441 case HWTSTAMP_FILTER_PTP_V2_L2_EVENT:
2442 tstamp_rx_ctrl |= RAVB_RXTSTAMP_TYPE_V2_L2_EVENT;
2443 break;
2444 default:
2445 config.rx_filter = HWTSTAMP_FILTER_ALL;
2446 tstamp_rx_ctrl |= RAVB_RXTSTAMP_TYPE_ALL;
2447 }
2448
2449 priv->tstamp_tx_ctrl = tstamp_tx_ctrl;
2450 priv->tstamp_rx_ctrl = tstamp_rx_ctrl;
2451
2452 return copy_to_user(req->ifr_data, &config, sizeof(config)) ?
2453 -EFAULT : 0;
2454}
2455
2456/* ioctl to device function */
2457static int ravb_do_ioctl(struct net_device *ndev, struct ifreq *req, int cmd)
2458{
2459 struct phy_device *phydev = ndev->phydev;
2460
2461 if (!netif_running(ndev))
2462 return -EINVAL;
2463
2464 if (!phydev)
2465 return -ENODEV;
2466
2467 switch (cmd) {
2468 case SIOCGHWTSTAMP:
2469 return ravb_hwtstamp_get(ndev, req);
2470 case SIOCSHWTSTAMP:
2471 return ravb_hwtstamp_set(ndev, req);
2472 }
2473
2474 return phy_mii_ioctl(phydev, req, cmd);
2475}
2476
2477static int ravb_change_mtu(struct net_device *ndev, int new_mtu)
2478{
2479 struct ravb_private *priv = netdev_priv(ndev);
2480
2481 WRITE_ONCE(ndev->mtu, new_mtu);
2482
2483 if (netif_running(ndev)) {
2484 synchronize_irq(priv->emac_irq);
2485 ravb_emac_init(ndev);
2486 }
2487
2488 netdev_update_features(ndev);
2489
2490 return 0;
2491}
2492
2493static void ravb_set_rx_csum(struct net_device *ndev, bool enable)
2494{
2495 struct ravb_private *priv = netdev_priv(ndev);
2496 unsigned long flags;
2497
2498 spin_lock_irqsave(&priv->lock, flags);
2499
2500 /* Disable TX and RX */
2501 ravb_rcv_snd_disable(ndev);
2502
2503 /* Modify RX Checksum setting */
2504 ravb_modify(ndev, ECMR, ECMR_RCSC, enable ? ECMR_RCSC : 0);
2505
2506 /* Enable TX and RX */
2507 ravb_rcv_snd_enable(ndev);
2508
2509 spin_unlock_irqrestore(&priv->lock, flags);
2510}
2511
2512static int ravb_endisable_csum_gbeth(struct net_device *ndev, enum ravb_reg reg,
2513 u32 val, u32 mask)
2514{
2515 u32 csr0 = CSR0_TPE | CSR0_RPE;
2516 int ret;
2517
2518 ravb_write(ndev, csr0 & ~mask, CSR0);
2519 ret = ravb_wait(ndev, CSR0, mask, 0);
2520 if (!ret)
2521 ravb_write(ndev, val, reg);
2522
2523 ravb_write(ndev, csr0, CSR0);
2524
2525 return ret;
2526}
2527
2528static int ravb_set_features_gbeth(struct net_device *ndev,
2529 netdev_features_t features)
2530{
2531 netdev_features_t changed = ndev->features ^ features;
2532 struct ravb_private *priv = netdev_priv(ndev);
2533 unsigned long flags;
2534 int ret = 0;
2535 u32 val;
2536
2537 spin_lock_irqsave(&priv->lock, flags);
2538 if (changed & NETIF_F_RXCSUM) {
2539 if (features & NETIF_F_RXCSUM)
2540 val = CSR2_CSUM_ENABLE;
2541 else
2542 val = 0;
2543
2544 ret = ravb_endisable_csum_gbeth(ndev, CSR2, val, CSR0_RPE);
2545 if (ret)
2546 goto done;
2547 }
2548
2549 if (changed & NETIF_F_HW_CSUM) {
2550 if (features & NETIF_F_HW_CSUM)
2551 val = CSR1_CSUM_ENABLE;
2552 else
2553 val = 0;
2554
2555 ret = ravb_endisable_csum_gbeth(ndev, CSR1, val, CSR0_TPE);
2556 if (ret)
2557 goto done;
2558 }
2559
2560done:
2561 spin_unlock_irqrestore(&priv->lock, flags);
2562
2563 return ret;
2564}
2565
2566static int ravb_set_features_rcar(struct net_device *ndev,
2567 netdev_features_t features)
2568{
2569 netdev_features_t changed = ndev->features ^ features;
2570
2571 if (changed & NETIF_F_RXCSUM)
2572 ravb_set_rx_csum(ndev, features & NETIF_F_RXCSUM);
2573
2574 return 0;
2575}
2576
2577static int ravb_set_features(struct net_device *ndev,
2578 netdev_features_t features)
2579{
2580 struct ravb_private *priv = netdev_priv(ndev);
2581 const struct ravb_hw_info *info = priv->info;
2582 struct device *dev = &priv->pdev->dev;
2583 int ret;
2584
2585 pm_runtime_get_noresume(dev);
2586
2587 if (pm_runtime_active(dev))
2588 ret = info->set_feature(ndev, features);
2589 else
2590 ret = 0;
2591
2592 pm_runtime_put_noidle(dev);
2593
2594 if (ret)
2595 return ret;
2596
2597 ndev->features = features;
2598
2599 return 0;
2600}
2601
2602static const struct net_device_ops ravb_netdev_ops = {
2603 .ndo_open = ravb_open,
2604 .ndo_stop = ravb_close,
2605 .ndo_start_xmit = ravb_start_xmit,
2606 .ndo_select_queue = ravb_select_queue,
2607 .ndo_get_stats = ravb_get_stats,
2608 .ndo_set_rx_mode = ravb_set_rx_mode,
2609 .ndo_tx_timeout = ravb_tx_timeout,
2610 .ndo_eth_ioctl = ravb_do_ioctl,
2611 .ndo_change_mtu = ravb_change_mtu,
2612 .ndo_validate_addr = eth_validate_addr,
2613 .ndo_set_mac_address = eth_mac_addr,
2614 .ndo_set_features = ravb_set_features,
2615};
2616
2617/* MDIO bus init function */
2618static int ravb_mdio_init(struct ravb_private *priv)
2619{
2620 struct platform_device *pdev = priv->pdev;
2621 struct device *dev = &pdev->dev;
2622 struct device_node *mdio_node;
2623 struct phy_device *phydev;
2624 struct device_node *pn;
2625 int error;
2626
2627 /* Bitbang init */
2628 priv->mdiobb.ops = &bb_ops;
2629
2630 /* MII controller setting */
2631 priv->mii_bus = alloc_mdio_bitbang(&priv->mdiobb);
2632 if (!priv->mii_bus)
2633 return -ENOMEM;
2634
2635 /* Hook up MII support for ethtool */
2636 priv->mii_bus->name = "ravb_mii";
2637 priv->mii_bus->parent = dev;
2638 snprintf(priv->mii_bus->id, MII_BUS_ID_SIZE, "%s-%x",
2639 pdev->name, pdev->id);
2640
2641 /* Register MDIO bus */
2642 mdio_node = of_get_child_by_name(dev->of_node, "mdio");
2643 if (!mdio_node) {
2644 /* backwards compatibility for DT lacking mdio subnode */
2645 mdio_node = of_node_get(dev->of_node);
2646 }
2647 error = of_mdiobus_register(priv->mii_bus, mdio_node);
2648 of_node_put(mdio_node);
2649 if (error)
2650 goto out_free_bus;
2651
2652 pn = of_parse_phandle(dev->of_node, "phy-handle", 0);
2653 phydev = of_phy_find_device(pn);
2654 if (phydev) {
2655 phydev->mac_managed_pm = true;
2656 put_device(&phydev->mdio.dev);
2657 }
2658 of_node_put(pn);
2659
2660 return 0;
2661
2662out_free_bus:
2663 free_mdio_bitbang(priv->mii_bus);
2664 return error;
2665}
2666
2667/* MDIO bus release function */
2668static int ravb_mdio_release(struct ravb_private *priv)
2669{
2670 /* Unregister mdio bus */
2671 mdiobus_unregister(priv->mii_bus);
2672
2673 /* Free bitbang info */
2674 free_mdio_bitbang(priv->mii_bus);
2675
2676 return 0;
2677}
2678
2679static const struct ravb_hw_info ravb_gen2_hw_info = {
2680 .receive = ravb_rx_rcar,
2681 .set_rate = ravb_set_rate_rcar,
2682 .set_feature = ravb_set_features_rcar,
2683 .dmac_init = ravb_dmac_init_rcar,
2684 .emac_init = ravb_emac_init_rcar,
2685 .gstrings_stats = ravb_gstrings_stats,
2686 .gstrings_size = sizeof(ravb_gstrings_stats),
2687 .net_hw_features = NETIF_F_RXCSUM,
2688 .net_features = NETIF_F_RXCSUM,
2689 .stats_len = ARRAY_SIZE(ravb_gstrings_stats),
2690 .tccr_mask = TCCR_TSRQ0 | TCCR_TSRQ1 | TCCR_TSRQ2 | TCCR_TSRQ3,
2691 .tx_max_frame_size = SZ_2K,
2692 .rx_max_frame_size = SZ_2K,
2693 .rx_buffer_size = SZ_2K +
2694 SKB_DATA_ALIGN(sizeof(struct skb_shared_info)),
2695 .rx_desc_size = sizeof(struct ravb_ex_rx_desc),
2696 .aligned_tx = 1,
2697 .gptp = 1,
2698 .nc_queues = 1,
2699 .magic_pkt = 1,
2700};
2701
2702static const struct ravb_hw_info ravb_gen3_hw_info = {
2703 .receive = ravb_rx_rcar,
2704 .set_rate = ravb_set_rate_rcar,
2705 .set_feature = ravb_set_features_rcar,
2706 .dmac_init = ravb_dmac_init_rcar,
2707 .emac_init = ravb_emac_init_rcar,
2708 .gstrings_stats = ravb_gstrings_stats,
2709 .gstrings_size = sizeof(ravb_gstrings_stats),
2710 .net_hw_features = NETIF_F_RXCSUM,
2711 .net_features = NETIF_F_RXCSUM,
2712 .stats_len = ARRAY_SIZE(ravb_gstrings_stats),
2713 .tccr_mask = TCCR_TSRQ0 | TCCR_TSRQ1 | TCCR_TSRQ2 | TCCR_TSRQ3,
2714 .tx_max_frame_size = SZ_2K,
2715 .rx_max_frame_size = SZ_2K,
2716 .rx_buffer_size = SZ_2K +
2717 SKB_DATA_ALIGN(sizeof(struct skb_shared_info)),
2718 .rx_desc_size = sizeof(struct ravb_ex_rx_desc),
2719 .internal_delay = 1,
2720 .tx_counters = 1,
2721 .multi_irqs = 1,
2722 .irq_en_dis = 1,
2723 .ccc_gac = 1,
2724 .nc_queues = 1,
2725 .magic_pkt = 1,
2726};
2727
2728static const struct ravb_hw_info ravb_gen4_hw_info = {
2729 .receive = ravb_rx_rcar,
2730 .set_rate = ravb_set_rate_rcar,
2731 .set_feature = ravb_set_features_rcar,
2732 .dmac_init = ravb_dmac_init_rcar,
2733 .emac_init = ravb_emac_init_rcar_gen4,
2734 .gstrings_stats = ravb_gstrings_stats,
2735 .gstrings_size = sizeof(ravb_gstrings_stats),
2736 .net_hw_features = NETIF_F_RXCSUM,
2737 .net_features = NETIF_F_RXCSUM,
2738 .stats_len = ARRAY_SIZE(ravb_gstrings_stats),
2739 .tccr_mask = TCCR_TSRQ0 | TCCR_TSRQ1 | TCCR_TSRQ2 | TCCR_TSRQ3,
2740 .tx_max_frame_size = SZ_2K,
2741 .rx_max_frame_size = SZ_2K,
2742 .rx_buffer_size = SZ_2K +
2743 SKB_DATA_ALIGN(sizeof(struct skb_shared_info)),
2744 .rx_desc_size = sizeof(struct ravb_ex_rx_desc),
2745 .internal_delay = 1,
2746 .tx_counters = 1,
2747 .multi_irqs = 1,
2748 .irq_en_dis = 1,
2749 .ccc_gac = 1,
2750 .nc_queues = 1,
2751 .magic_pkt = 1,
2752};
2753
2754static const struct ravb_hw_info ravb_rzv2m_hw_info = {
2755 .receive = ravb_rx_rcar,
2756 .set_rate = ravb_set_rate_rcar,
2757 .set_feature = ravb_set_features_rcar,
2758 .dmac_init = ravb_dmac_init_rcar,
2759 .emac_init = ravb_emac_init_rcar,
2760 .gstrings_stats = ravb_gstrings_stats,
2761 .gstrings_size = sizeof(ravb_gstrings_stats),
2762 .net_hw_features = NETIF_F_RXCSUM,
2763 .net_features = NETIF_F_RXCSUM,
2764 .stats_len = ARRAY_SIZE(ravb_gstrings_stats),
2765 .tccr_mask = TCCR_TSRQ0 | TCCR_TSRQ1 | TCCR_TSRQ2 | TCCR_TSRQ3,
2766 .tx_max_frame_size = SZ_2K,
2767 .rx_max_frame_size = SZ_2K,
2768 .rx_buffer_size = SZ_2K +
2769 SKB_DATA_ALIGN(sizeof(struct skb_shared_info)),
2770 .rx_desc_size = sizeof(struct ravb_ex_rx_desc),
2771 .multi_irqs = 1,
2772 .err_mgmt_irqs = 1,
2773 .gptp = 1,
2774 .gptp_ref_clk = 1,
2775 .nc_queues = 1,
2776 .magic_pkt = 1,
2777};
2778
2779static const struct ravb_hw_info gbeth_hw_info = {
2780 .receive = ravb_rx_gbeth,
2781 .set_rate = ravb_set_rate_gbeth,
2782 .set_feature = ravb_set_features_gbeth,
2783 .dmac_init = ravb_dmac_init_gbeth,
2784 .emac_init = ravb_emac_init_gbeth,
2785 .gstrings_stats = ravb_gstrings_stats_gbeth,
2786 .gstrings_size = sizeof(ravb_gstrings_stats_gbeth),
2787 .net_hw_features = NETIF_F_RXCSUM | NETIF_F_HW_CSUM,
2788 .net_features = NETIF_F_RXCSUM | NETIF_F_HW_CSUM,
2789 .vlan_features = NETIF_F_RXCSUM | NETIF_F_HW_CSUM,
2790 .stats_len = ARRAY_SIZE(ravb_gstrings_stats_gbeth),
2791 .tccr_mask = TCCR_TSRQ0,
2792 .tx_max_frame_size = 1522,
2793 .rx_max_frame_size = SZ_8K,
2794 .rx_buffer_size = SZ_2K,
2795 .rx_desc_size = sizeof(struct ravb_rx_desc),
2796 .aligned_tx = 1,
2797 .coalesce_irqs = 1,
2798 .tx_counters = 1,
2799 .carrier_counters = 1,
2800 .half_duplex = 1,
2801};
2802
2803static const struct of_device_id ravb_match_table[] = {
2804 { .compatible = "renesas,etheravb-r8a7790", .data = &ravb_gen2_hw_info },
2805 { .compatible = "renesas,etheravb-r8a7794", .data = &ravb_gen2_hw_info },
2806 { .compatible = "renesas,etheravb-rcar-gen2", .data = &ravb_gen2_hw_info },
2807 { .compatible = "renesas,etheravb-r8a7795", .data = &ravb_gen3_hw_info },
2808 { .compatible = "renesas,etheravb-rcar-gen3", .data = &ravb_gen3_hw_info },
2809 { .compatible = "renesas,etheravb-rcar-gen4", .data = &ravb_gen4_hw_info },
2810 { .compatible = "renesas,etheravb-rzv2m", .data = &ravb_rzv2m_hw_info },
2811 { .compatible = "renesas,rzg2l-gbeth", .data = &gbeth_hw_info },
2812 { }
2813};
2814MODULE_DEVICE_TABLE(of, ravb_match_table);
2815
2816static int ravb_setup_irq(struct ravb_private *priv, const char *irq_name,
2817 const char *ch, int *irq, irq_handler_t handler)
2818{
2819 struct platform_device *pdev = priv->pdev;
2820 struct net_device *ndev = priv->ndev;
2821 struct device *dev = &pdev->dev;
2822 const char *devname = dev_name(dev);
2823 unsigned long flags;
2824 int error, irq_num;
2825
2826 if (irq_name) {
2827 devname = devm_kasprintf(dev, GFP_KERNEL, "%s:%s", devname, ch);
2828 if (!devname)
2829 return -ENOMEM;
2830
2831 irq_num = platform_get_irq_byname(pdev, irq_name);
2832 flags = 0;
2833 } else {
2834 irq_num = platform_get_irq(pdev, 0);
2835 flags = IRQF_SHARED;
2836 }
2837 if (irq_num < 0)
2838 return irq_num;
2839
2840 if (irq)
2841 *irq = irq_num;
2842
2843 error = devm_request_irq(dev, irq_num, handler, flags, devname, ndev);
2844 if (error)
2845 netdev_err(ndev, "cannot request IRQ %s\n", devname);
2846
2847 return error;
2848}
2849
2850static int ravb_setup_irqs(struct ravb_private *priv)
2851{
2852 const struct ravb_hw_info *info = priv->info;
2853 struct net_device *ndev = priv->ndev;
2854 const char *irq_name, *emac_irq_name;
2855 int error;
2856
2857 if (!info->multi_irqs)
2858 return ravb_setup_irq(priv, NULL, NULL, &ndev->irq, ravb_interrupt);
2859
2860 if (info->err_mgmt_irqs) {
2861 irq_name = "dia";
2862 emac_irq_name = "line3";
2863 } else {
2864 irq_name = "ch22";
2865 emac_irq_name = "ch24";
2866 }
2867
2868 error = ravb_setup_irq(priv, irq_name, "ch22:multi", &ndev->irq, ravb_multi_interrupt);
2869 if (error)
2870 return error;
2871
2872 error = ravb_setup_irq(priv, emac_irq_name, "ch24:emac", &priv->emac_irq,
2873 ravb_emac_interrupt);
2874 if (error)
2875 return error;
2876
2877 if (info->err_mgmt_irqs) {
2878 error = ravb_setup_irq(priv, "err_a", "err_a", NULL, ravb_multi_interrupt);
2879 if (error)
2880 return error;
2881
2882 error = ravb_setup_irq(priv, "mgmt_a", "mgmt_a", NULL, ravb_multi_interrupt);
2883 if (error)
2884 return error;
2885 }
2886
2887 error = ravb_setup_irq(priv, "ch0", "ch0:rx_be", NULL, ravb_be_interrupt);
2888 if (error)
2889 return error;
2890
2891 error = ravb_setup_irq(priv, "ch1", "ch1:rx_nc", NULL, ravb_nc_interrupt);
2892 if (error)
2893 return error;
2894
2895 error = ravb_setup_irq(priv, "ch18", "ch18:tx_be", NULL, ravb_be_interrupt);
2896 if (error)
2897 return error;
2898
2899 return ravb_setup_irq(priv, "ch19", "ch19:tx_nc", NULL, ravb_nc_interrupt);
2900}
2901
2902static int ravb_probe(struct platform_device *pdev)
2903{
2904 struct device_node *np = pdev->dev.of_node;
2905 const struct ravb_hw_info *info;
2906 struct reset_control *rstc;
2907 struct ravb_private *priv;
2908 struct net_device *ndev;
2909 struct resource *res;
2910 int error, q;
2911
2912 if (!np) {
2913 dev_err(&pdev->dev,
2914 "this driver is required to be instantiated from device tree\n");
2915 return -EINVAL;
2916 }
2917
2918 rstc = devm_reset_control_get_exclusive(&pdev->dev, NULL);
2919 if (IS_ERR(rstc))
2920 return dev_err_probe(&pdev->dev, PTR_ERR(rstc),
2921 "failed to get cpg reset\n");
2922
2923 ndev = alloc_etherdev_mqs(sizeof(struct ravb_private),
2924 NUM_TX_QUEUE, NUM_RX_QUEUE);
2925 if (!ndev)
2926 return -ENOMEM;
2927
2928 info = of_device_get_match_data(&pdev->dev);
2929
2930 ndev->features = info->net_features;
2931 ndev->hw_features = info->net_hw_features;
2932 ndev->vlan_features = info->vlan_features;
2933
2934 error = reset_control_deassert(rstc);
2935 if (error)
2936 goto out_free_netdev;
2937
2938 SET_NETDEV_DEV(ndev, &pdev->dev);
2939
2940 priv = netdev_priv(ndev);
2941 priv->info = info;
2942 priv->rstc = rstc;
2943 priv->ndev = ndev;
2944 priv->pdev = pdev;
2945 priv->num_tx_ring[RAVB_BE] = BE_TX_RING_SIZE;
2946 priv->num_rx_ring[RAVB_BE] = BE_RX_RING_SIZE;
2947 if (info->nc_queues) {
2948 priv->num_tx_ring[RAVB_NC] = NC_TX_RING_SIZE;
2949 priv->num_rx_ring[RAVB_NC] = NC_RX_RING_SIZE;
2950 }
2951
2952 error = ravb_setup_irqs(priv);
2953 if (error)
2954 goto out_reset_assert;
2955
2956 priv->clk = devm_clk_get(&pdev->dev, NULL);
2957 if (IS_ERR(priv->clk)) {
2958 error = PTR_ERR(priv->clk);
2959 goto out_reset_assert;
2960 }
2961
2962 if (info->gptp_ref_clk) {
2963 priv->gptp_clk = devm_clk_get(&pdev->dev, "gptp");
2964 if (IS_ERR(priv->gptp_clk)) {
2965 error = PTR_ERR(priv->gptp_clk);
2966 goto out_reset_assert;
2967 }
2968 }
2969
2970 priv->refclk = devm_clk_get_optional(&pdev->dev, "refclk");
2971 if (IS_ERR(priv->refclk)) {
2972 error = PTR_ERR(priv->refclk);
2973 goto out_reset_assert;
2974 }
2975 clk_prepare(priv->refclk);
2976
2977 platform_set_drvdata(pdev, ndev);
2978 pm_runtime_set_autosuspend_delay(&pdev->dev, 100);
2979 pm_runtime_use_autosuspend(&pdev->dev);
2980 pm_runtime_enable(&pdev->dev);
2981 error = pm_runtime_resume_and_get(&pdev->dev);
2982 if (error < 0)
2983 goto out_rpm_disable;
2984
2985 priv->addr = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
2986 if (IS_ERR(priv->addr)) {
2987 error = PTR_ERR(priv->addr);
2988 goto out_rpm_put;
2989 }
2990
2991 /* The Ether-specific entries in the device structure. */
2992 ndev->base_addr = res->start;
2993
2994 spin_lock_init(&priv->lock);
2995 INIT_WORK(&priv->work, ravb_tx_timeout_work);
2996
2997 error = of_get_phy_mode(np, &priv->phy_interface);
2998 if (error && error != -ENODEV)
2999 goto out_rpm_put;
3000
3001 priv->no_avb_link = of_property_read_bool(np, "renesas,no-ether-link");
3002 priv->avb_link_active_low =
3003 of_property_read_bool(np, "renesas,ether-link-active-low");
3004
3005 ndev->max_mtu = info->tx_max_frame_size -
3006 (ETH_HLEN + VLAN_HLEN + ETH_FCS_LEN);
3007 ndev->min_mtu = ETH_MIN_MTU;
3008
3009 /* FIXME: R-Car Gen2 has 4byte alignment restriction for tx buffer
3010 * Use two descriptor to handle such situation. First descriptor to
3011 * handle aligned data buffer and second descriptor to handle the
3012 * overflow data because of alignment.
3013 */
3014 priv->num_tx_desc = info->aligned_tx ? 2 : 1;
3015
3016 /* Set function */
3017 ndev->netdev_ops = &ravb_netdev_ops;
3018 ndev->ethtool_ops = &ravb_ethtool_ops;
3019
3020 error = ravb_compute_gti(ndev);
3021 if (error)
3022 goto out_rpm_put;
3023
3024 ravb_parse_delay_mode(np, ndev);
3025
3026 /* Allocate descriptor base address table */
3027 priv->desc_bat_size = sizeof(struct ravb_desc) * DBAT_ENTRY_NUM;
3028 priv->desc_bat = dma_alloc_coherent(ndev->dev.parent, priv->desc_bat_size,
3029 &priv->desc_bat_dma, GFP_KERNEL);
3030 if (!priv->desc_bat) {
3031 dev_err(&pdev->dev,
3032 "Cannot allocate desc base address table (size %d bytes)\n",
3033 priv->desc_bat_size);
3034 error = -ENOMEM;
3035 goto out_rpm_put;
3036 }
3037 for (q = RAVB_BE; q < DBAT_ENTRY_NUM; q++)
3038 priv->desc_bat[q].die_dt = DT_EOS;
3039
3040 /* Initialise HW timestamp list */
3041 INIT_LIST_HEAD(&priv->ts_skb_list);
3042
3043 /* Debug message level */
3044 priv->msg_enable = RAVB_DEF_MSG_ENABLE;
3045
3046 /* Set config mode as this is needed for PHY initialization. */
3047 error = ravb_set_opmode(ndev, CCC_OPC_CONFIG);
3048 if (error)
3049 goto out_rpm_put;
3050
3051 /* Read and set MAC address */
3052 ravb_read_mac_address(np, ndev);
3053 if (!is_valid_ether_addr(ndev->dev_addr)) {
3054 dev_warn(&pdev->dev,
3055 "no valid MAC address supplied, using a random one\n");
3056 eth_hw_addr_random(ndev);
3057 }
3058
3059 /* MDIO bus init */
3060 error = ravb_mdio_init(priv);
3061 if (error) {
3062 dev_err(&pdev->dev, "failed to initialize MDIO\n");
3063 goto out_reset_mode;
3064 }
3065
3066 /* Undo previous switch to config opmode. */
3067 error = ravb_set_opmode(ndev, CCC_OPC_RESET);
3068 if (error)
3069 goto out_mdio_release;
3070
3071 netif_napi_add(ndev, &priv->napi[RAVB_BE], ravb_poll);
3072 if (info->nc_queues)
3073 netif_napi_add(ndev, &priv->napi[RAVB_NC], ravb_poll);
3074
3075 if (info->coalesce_irqs) {
3076 netdev_sw_irq_coalesce_default_on(ndev);
3077 if (num_present_cpus() == 1)
3078 dev_set_threaded(ndev, true);
3079 }
3080
3081 /* Network device register */
3082 error = register_netdev(ndev);
3083 if (error)
3084 goto out_napi_del;
3085
3086 device_set_wakeup_capable(&pdev->dev, 1);
3087
3088 /* Print device information */
3089 netdev_info(ndev, "Base address at %#x, %pM, IRQ %d.\n",
3090 (u32)ndev->base_addr, ndev->dev_addr, ndev->irq);
3091
3092 pm_runtime_mark_last_busy(&pdev->dev);
3093 pm_runtime_put_autosuspend(&pdev->dev);
3094
3095 return 0;
3096
3097out_napi_del:
3098 if (info->nc_queues)
3099 netif_napi_del(&priv->napi[RAVB_NC]);
3100
3101 netif_napi_del(&priv->napi[RAVB_BE]);
3102out_mdio_release:
3103 ravb_mdio_release(priv);
3104out_reset_mode:
3105 ravb_set_opmode(ndev, CCC_OPC_RESET);
3106 dma_free_coherent(ndev->dev.parent, priv->desc_bat_size, priv->desc_bat,
3107 priv->desc_bat_dma);
3108out_rpm_put:
3109 pm_runtime_put(&pdev->dev);
3110out_rpm_disable:
3111 pm_runtime_disable(&pdev->dev);
3112 pm_runtime_dont_use_autosuspend(&pdev->dev);
3113 clk_unprepare(priv->refclk);
3114out_reset_assert:
3115 reset_control_assert(rstc);
3116out_free_netdev:
3117 free_netdev(ndev);
3118 return error;
3119}
3120
3121static void ravb_remove(struct platform_device *pdev)
3122{
3123 struct net_device *ndev = platform_get_drvdata(pdev);
3124 struct ravb_private *priv = netdev_priv(ndev);
3125 const struct ravb_hw_info *info = priv->info;
3126 struct device *dev = &priv->pdev->dev;
3127 int error;
3128
3129 error = pm_runtime_resume_and_get(dev);
3130 if (error < 0)
3131 return;
3132
3133 unregister_netdev(ndev);
3134 if (info->nc_queues)
3135 netif_napi_del(&priv->napi[RAVB_NC]);
3136 netif_napi_del(&priv->napi[RAVB_BE]);
3137
3138 ravb_mdio_release(priv);
3139
3140 dma_free_coherent(ndev->dev.parent, priv->desc_bat_size, priv->desc_bat,
3141 priv->desc_bat_dma);
3142
3143 pm_runtime_put_sync_suspend(&pdev->dev);
3144 pm_runtime_disable(&pdev->dev);
3145 pm_runtime_dont_use_autosuspend(dev);
3146 clk_unprepare(priv->refclk);
3147 reset_control_assert(priv->rstc);
3148 free_netdev(ndev);
3149 platform_set_drvdata(pdev, NULL);
3150}
3151
3152static int ravb_wol_setup(struct net_device *ndev)
3153{
3154 struct ravb_private *priv = netdev_priv(ndev);
3155 const struct ravb_hw_info *info = priv->info;
3156
3157 /* Disable interrupts by clearing the interrupt masks. */
3158 ravb_write(ndev, 0, RIC0);
3159 ravb_write(ndev, 0, RIC2);
3160 ravb_write(ndev, 0, TIC);
3161
3162 /* Only allow ECI interrupts */
3163 synchronize_irq(priv->emac_irq);
3164 if (info->nc_queues)
3165 napi_disable(&priv->napi[RAVB_NC]);
3166 napi_disable(&priv->napi[RAVB_BE]);
3167 ravb_write(ndev, ECSIPR_MPDIP, ECSIPR);
3168
3169 /* Enable MagicPacket */
3170 ravb_modify(ndev, ECMR, ECMR_MPDE, ECMR_MPDE);
3171
3172 if (priv->info->ccc_gac)
3173 ravb_ptp_stop(ndev);
3174
3175 return enable_irq_wake(priv->emac_irq);
3176}
3177
3178static int ravb_wol_restore(struct net_device *ndev)
3179{
3180 struct ravb_private *priv = netdev_priv(ndev);
3181 const struct ravb_hw_info *info = priv->info;
3182 int error;
3183
3184 /* Set reset mode to rearm the WoL logic. */
3185 error = ravb_set_opmode(ndev, CCC_OPC_RESET);
3186 if (error)
3187 return error;
3188
3189 /* Set AVB config mode. */
3190 error = ravb_set_config_mode(ndev);
3191 if (error)
3192 return error;
3193
3194 if (priv->info->ccc_gac)
3195 ravb_ptp_init(ndev, priv->pdev);
3196
3197 if (info->nc_queues)
3198 napi_enable(&priv->napi[RAVB_NC]);
3199 napi_enable(&priv->napi[RAVB_BE]);
3200
3201 /* Disable MagicPacket */
3202 ravb_modify(ndev, ECMR, ECMR_MPDE, 0);
3203
3204 ravb_close(ndev);
3205
3206 return disable_irq_wake(priv->emac_irq);
3207}
3208
3209static int ravb_suspend(struct device *dev)
3210{
3211 struct net_device *ndev = dev_get_drvdata(dev);
3212 struct ravb_private *priv = netdev_priv(ndev);
3213 int ret;
3214
3215 if (!netif_running(ndev))
3216 goto reset_assert;
3217
3218 netif_device_detach(ndev);
3219
3220 rtnl_lock();
3221 if (priv->wol_enabled) {
3222 ret = ravb_wol_setup(ndev);
3223 rtnl_unlock();
3224 return ret;
3225 }
3226
3227 ret = ravb_close(ndev);
3228 rtnl_unlock();
3229 if (ret)
3230 return ret;
3231
3232 ret = pm_runtime_force_suspend(&priv->pdev->dev);
3233 if (ret)
3234 return ret;
3235
3236reset_assert:
3237 return reset_control_assert(priv->rstc);
3238}
3239
3240static int ravb_resume(struct device *dev)
3241{
3242 struct net_device *ndev = dev_get_drvdata(dev);
3243 struct ravb_private *priv = netdev_priv(ndev);
3244 int ret;
3245
3246 ret = reset_control_deassert(priv->rstc);
3247 if (ret)
3248 return ret;
3249
3250 if (!netif_running(ndev))
3251 return 0;
3252
3253 rtnl_lock();
3254 /* If WoL is enabled restore the interface. */
3255 if (priv->wol_enabled)
3256 ret = ravb_wol_restore(ndev);
3257 else
3258 ret = pm_runtime_force_resume(dev);
3259 if (ret) {
3260 rtnl_unlock();
3261 return ret;
3262 }
3263
3264 /* Reopening the interface will restore the device to the working state. */
3265 ret = ravb_open(ndev);
3266 rtnl_unlock();
3267 if (ret < 0)
3268 goto out_rpm_put;
3269
3270 ravb_set_rx_mode(ndev);
3271 netif_device_attach(ndev);
3272
3273 return 0;
3274
3275out_rpm_put:
3276 if (!priv->wol_enabled) {
3277 pm_runtime_mark_last_busy(dev);
3278 pm_runtime_put_autosuspend(dev);
3279 }
3280
3281 return ret;
3282}
3283
3284static int ravb_runtime_suspend(struct device *dev)
3285{
3286 struct net_device *ndev = dev_get_drvdata(dev);
3287 struct ravb_private *priv = netdev_priv(ndev);
3288
3289 clk_disable(priv->refclk);
3290
3291 return 0;
3292}
3293
3294static int ravb_runtime_resume(struct device *dev)
3295{
3296 struct net_device *ndev = dev_get_drvdata(dev);
3297 struct ravb_private *priv = netdev_priv(ndev);
3298
3299 return clk_enable(priv->refclk);
3300}
3301
3302static const struct dev_pm_ops ravb_dev_pm_ops = {
3303 SYSTEM_SLEEP_PM_OPS(ravb_suspend, ravb_resume)
3304 RUNTIME_PM_OPS(ravb_runtime_suspend, ravb_runtime_resume, NULL)
3305};
3306
3307static struct platform_driver ravb_driver = {
3308 .probe = ravb_probe,
3309 .remove = ravb_remove,
3310 .driver = {
3311 .name = "ravb",
3312 .pm = pm_ptr(&ravb_dev_pm_ops),
3313 .of_match_table = ravb_match_table,
3314 },
3315};
3316
3317module_platform_driver(ravb_driver);
3318
3319MODULE_AUTHOR("Mitsuhiro Kimura, Masaru Nagai");
3320MODULE_DESCRIPTION("Renesas Ethernet AVB driver");
3321MODULE_LICENSE("GPL v2");
1// SPDX-License-Identifier: GPL-2.0
2/* Renesas Ethernet AVB device driver
3 *
4 * Copyright (C) 2014-2019 Renesas Electronics Corporation
5 * Copyright (C) 2015 Renesas Solutions Corp.
6 * Copyright (C) 2015-2016 Cogent Embedded, Inc. <source@cogentembedded.com>
7 *
8 * Based on the SuperH Ethernet driver
9 */
10
11#include <linux/cache.h>
12#include <linux/clk.h>
13#include <linux/delay.h>
14#include <linux/dma-mapping.h>
15#include <linux/err.h>
16#include <linux/etherdevice.h>
17#include <linux/ethtool.h>
18#include <linux/if_vlan.h>
19#include <linux/kernel.h>
20#include <linux/list.h>
21#include <linux/module.h>
22#include <linux/net_tstamp.h>
23#include <linux/of.h>
24#include <linux/of_device.h>
25#include <linux/of_irq.h>
26#include <linux/of_mdio.h>
27#include <linux/of_net.h>
28#include <linux/pm_runtime.h>
29#include <linux/slab.h>
30#include <linux/spinlock.h>
31#include <linux/sys_soc.h>
32
33#include <asm/div64.h>
34
35#include "ravb.h"
36
37#define RAVB_DEF_MSG_ENABLE \
38 (NETIF_MSG_LINK | \
39 NETIF_MSG_TIMER | \
40 NETIF_MSG_RX_ERR | \
41 NETIF_MSG_TX_ERR)
42
43static const char *ravb_rx_irqs[NUM_RX_QUEUE] = {
44 "ch0", /* RAVB_BE */
45 "ch1", /* RAVB_NC */
46};
47
48static const char *ravb_tx_irqs[NUM_TX_QUEUE] = {
49 "ch18", /* RAVB_BE */
50 "ch19", /* RAVB_NC */
51};
52
53void ravb_modify(struct net_device *ndev, enum ravb_reg reg, u32 clear,
54 u32 set)
55{
56 ravb_write(ndev, (ravb_read(ndev, reg) & ~clear) | set, reg);
57}
58
59int ravb_wait(struct net_device *ndev, enum ravb_reg reg, u32 mask, u32 value)
60{
61 int i;
62
63 for (i = 0; i < 10000; i++) {
64 if ((ravb_read(ndev, reg) & mask) == value)
65 return 0;
66 udelay(10);
67 }
68 return -ETIMEDOUT;
69}
70
71static int ravb_config(struct net_device *ndev)
72{
73 int error;
74
75 /* Set config mode */
76 ravb_modify(ndev, CCC, CCC_OPC, CCC_OPC_CONFIG);
77 /* Check if the operating mode is changed to the config mode */
78 error = ravb_wait(ndev, CSR, CSR_OPS, CSR_OPS_CONFIG);
79 if (error)
80 netdev_err(ndev, "failed to switch device to config mode\n");
81
82 return error;
83}
84
85static void ravb_set_rate(struct net_device *ndev)
86{
87 struct ravb_private *priv = netdev_priv(ndev);
88
89 switch (priv->speed) {
90 case 100: /* 100BASE */
91 ravb_write(ndev, GECMR_SPEED_100, GECMR);
92 break;
93 case 1000: /* 1000BASE */
94 ravb_write(ndev, GECMR_SPEED_1000, GECMR);
95 break;
96 }
97}
98
99static void ravb_set_buffer_align(struct sk_buff *skb)
100{
101 u32 reserve = (unsigned long)skb->data & (RAVB_ALIGN - 1);
102
103 if (reserve)
104 skb_reserve(skb, RAVB_ALIGN - reserve);
105}
106
107/* Get MAC address from the MAC address registers
108 *
109 * Ethernet AVB device doesn't have ROM for MAC address.
110 * This function gets the MAC address that was used by a bootloader.
111 */
112static void ravb_read_mac_address(struct device_node *np,
113 struct net_device *ndev)
114{
115 int ret;
116
117 ret = of_get_mac_address(np, ndev->dev_addr);
118 if (ret) {
119 u32 mahr = ravb_read(ndev, MAHR);
120 u32 malr = ravb_read(ndev, MALR);
121
122 ndev->dev_addr[0] = (mahr >> 24) & 0xFF;
123 ndev->dev_addr[1] = (mahr >> 16) & 0xFF;
124 ndev->dev_addr[2] = (mahr >> 8) & 0xFF;
125 ndev->dev_addr[3] = (mahr >> 0) & 0xFF;
126 ndev->dev_addr[4] = (malr >> 8) & 0xFF;
127 ndev->dev_addr[5] = (malr >> 0) & 0xFF;
128 }
129}
130
131static void ravb_mdio_ctrl(struct mdiobb_ctrl *ctrl, u32 mask, int set)
132{
133 struct ravb_private *priv = container_of(ctrl, struct ravb_private,
134 mdiobb);
135
136 ravb_modify(priv->ndev, PIR, mask, set ? mask : 0);
137}
138
139/* MDC pin control */
140static void ravb_set_mdc(struct mdiobb_ctrl *ctrl, int level)
141{
142 ravb_mdio_ctrl(ctrl, PIR_MDC, level);
143}
144
145/* Data I/O pin control */
146static void ravb_set_mdio_dir(struct mdiobb_ctrl *ctrl, int output)
147{
148 ravb_mdio_ctrl(ctrl, PIR_MMD, output);
149}
150
151/* Set data bit */
152static void ravb_set_mdio_data(struct mdiobb_ctrl *ctrl, int value)
153{
154 ravb_mdio_ctrl(ctrl, PIR_MDO, value);
155}
156
157/* Get data bit */
158static int ravb_get_mdio_data(struct mdiobb_ctrl *ctrl)
159{
160 struct ravb_private *priv = container_of(ctrl, struct ravb_private,
161 mdiobb);
162
163 return (ravb_read(priv->ndev, PIR) & PIR_MDI) != 0;
164}
165
166/* MDIO bus control struct */
167static const struct mdiobb_ops bb_ops = {
168 .owner = THIS_MODULE,
169 .set_mdc = ravb_set_mdc,
170 .set_mdio_dir = ravb_set_mdio_dir,
171 .set_mdio_data = ravb_set_mdio_data,
172 .get_mdio_data = ravb_get_mdio_data,
173};
174
175/* Free TX skb function for AVB-IP */
176static int ravb_tx_free(struct net_device *ndev, int q, bool free_txed_only)
177{
178 struct ravb_private *priv = netdev_priv(ndev);
179 struct net_device_stats *stats = &priv->stats[q];
180 int num_tx_desc = priv->num_tx_desc;
181 struct ravb_tx_desc *desc;
182 int free_num = 0;
183 int entry;
184 u32 size;
185
186 for (; priv->cur_tx[q] - priv->dirty_tx[q] > 0; priv->dirty_tx[q]++) {
187 bool txed;
188
189 entry = priv->dirty_tx[q] % (priv->num_tx_ring[q] *
190 num_tx_desc);
191 desc = &priv->tx_ring[q][entry];
192 txed = desc->die_dt == DT_FEMPTY;
193 if (free_txed_only && !txed)
194 break;
195 /* Descriptor type must be checked before all other reads */
196 dma_rmb();
197 size = le16_to_cpu(desc->ds_tagl) & TX_DS;
198 /* Free the original skb. */
199 if (priv->tx_skb[q][entry / num_tx_desc]) {
200 dma_unmap_single(ndev->dev.parent, le32_to_cpu(desc->dptr),
201 size, DMA_TO_DEVICE);
202 /* Last packet descriptor? */
203 if (entry % num_tx_desc == num_tx_desc - 1) {
204 entry /= num_tx_desc;
205 dev_kfree_skb_any(priv->tx_skb[q][entry]);
206 priv->tx_skb[q][entry] = NULL;
207 if (txed)
208 stats->tx_packets++;
209 }
210 free_num++;
211 }
212 if (txed)
213 stats->tx_bytes += size;
214 desc->die_dt = DT_EEMPTY;
215 }
216 return free_num;
217}
218
219/* Free skb's and DMA buffers for Ethernet AVB */
220static void ravb_ring_free(struct net_device *ndev, int q)
221{
222 struct ravb_private *priv = netdev_priv(ndev);
223 int num_tx_desc = priv->num_tx_desc;
224 int ring_size;
225 int i;
226
227 if (priv->rx_ring[q]) {
228 for (i = 0; i < priv->num_rx_ring[q]; i++) {
229 struct ravb_ex_rx_desc *desc = &priv->rx_ring[q][i];
230
231 if (!dma_mapping_error(ndev->dev.parent,
232 le32_to_cpu(desc->dptr)))
233 dma_unmap_single(ndev->dev.parent,
234 le32_to_cpu(desc->dptr),
235 RX_BUF_SZ,
236 DMA_FROM_DEVICE);
237 }
238 ring_size = sizeof(struct ravb_ex_rx_desc) *
239 (priv->num_rx_ring[q] + 1);
240 dma_free_coherent(ndev->dev.parent, ring_size, priv->rx_ring[q],
241 priv->rx_desc_dma[q]);
242 priv->rx_ring[q] = NULL;
243 }
244
245 if (priv->tx_ring[q]) {
246 ravb_tx_free(ndev, q, false);
247
248 ring_size = sizeof(struct ravb_tx_desc) *
249 (priv->num_tx_ring[q] * num_tx_desc + 1);
250 dma_free_coherent(ndev->dev.parent, ring_size, priv->tx_ring[q],
251 priv->tx_desc_dma[q]);
252 priv->tx_ring[q] = NULL;
253 }
254
255 /* Free RX skb ringbuffer */
256 if (priv->rx_skb[q]) {
257 for (i = 0; i < priv->num_rx_ring[q]; i++)
258 dev_kfree_skb(priv->rx_skb[q][i]);
259 }
260 kfree(priv->rx_skb[q]);
261 priv->rx_skb[q] = NULL;
262
263 /* Free aligned TX buffers */
264 kfree(priv->tx_align[q]);
265 priv->tx_align[q] = NULL;
266
267 /* Free TX skb ringbuffer.
268 * SKBs are freed by ravb_tx_free() call above.
269 */
270 kfree(priv->tx_skb[q]);
271 priv->tx_skb[q] = NULL;
272}
273
274/* Format skb and descriptor buffer for Ethernet AVB */
275static void ravb_ring_format(struct net_device *ndev, int q)
276{
277 struct ravb_private *priv = netdev_priv(ndev);
278 int num_tx_desc = priv->num_tx_desc;
279 struct ravb_ex_rx_desc *rx_desc;
280 struct ravb_tx_desc *tx_desc;
281 struct ravb_desc *desc;
282 int rx_ring_size = sizeof(*rx_desc) * priv->num_rx_ring[q];
283 int tx_ring_size = sizeof(*tx_desc) * priv->num_tx_ring[q] *
284 num_tx_desc;
285 dma_addr_t dma_addr;
286 int i;
287
288 priv->cur_rx[q] = 0;
289 priv->cur_tx[q] = 0;
290 priv->dirty_rx[q] = 0;
291 priv->dirty_tx[q] = 0;
292
293 memset(priv->rx_ring[q], 0, rx_ring_size);
294 /* Build RX ring buffer */
295 for (i = 0; i < priv->num_rx_ring[q]; i++) {
296 /* RX descriptor */
297 rx_desc = &priv->rx_ring[q][i];
298 rx_desc->ds_cc = cpu_to_le16(RX_BUF_SZ);
299 dma_addr = dma_map_single(ndev->dev.parent, priv->rx_skb[q][i]->data,
300 RX_BUF_SZ,
301 DMA_FROM_DEVICE);
302 /* We just set the data size to 0 for a failed mapping which
303 * should prevent DMA from happening...
304 */
305 if (dma_mapping_error(ndev->dev.parent, dma_addr))
306 rx_desc->ds_cc = cpu_to_le16(0);
307 rx_desc->dptr = cpu_to_le32(dma_addr);
308 rx_desc->die_dt = DT_FEMPTY;
309 }
310 rx_desc = &priv->rx_ring[q][i];
311 rx_desc->dptr = cpu_to_le32((u32)priv->rx_desc_dma[q]);
312 rx_desc->die_dt = DT_LINKFIX; /* type */
313
314 memset(priv->tx_ring[q], 0, tx_ring_size);
315 /* Build TX ring buffer */
316 for (i = 0, tx_desc = priv->tx_ring[q]; i < priv->num_tx_ring[q];
317 i++, tx_desc++) {
318 tx_desc->die_dt = DT_EEMPTY;
319 if (num_tx_desc > 1) {
320 tx_desc++;
321 tx_desc->die_dt = DT_EEMPTY;
322 }
323 }
324 tx_desc->dptr = cpu_to_le32((u32)priv->tx_desc_dma[q]);
325 tx_desc->die_dt = DT_LINKFIX; /* type */
326
327 /* RX descriptor base address for best effort */
328 desc = &priv->desc_bat[RX_QUEUE_OFFSET + q];
329 desc->die_dt = DT_LINKFIX; /* type */
330 desc->dptr = cpu_to_le32((u32)priv->rx_desc_dma[q]);
331
332 /* TX descriptor base address for best effort */
333 desc = &priv->desc_bat[q];
334 desc->die_dt = DT_LINKFIX; /* type */
335 desc->dptr = cpu_to_le32((u32)priv->tx_desc_dma[q]);
336}
337
338/* Init skb and descriptor buffer for Ethernet AVB */
339static int ravb_ring_init(struct net_device *ndev, int q)
340{
341 struct ravb_private *priv = netdev_priv(ndev);
342 int num_tx_desc = priv->num_tx_desc;
343 struct sk_buff *skb;
344 int ring_size;
345 int i;
346
347 /* Allocate RX and TX skb rings */
348 priv->rx_skb[q] = kcalloc(priv->num_rx_ring[q],
349 sizeof(*priv->rx_skb[q]), GFP_KERNEL);
350 priv->tx_skb[q] = kcalloc(priv->num_tx_ring[q],
351 sizeof(*priv->tx_skb[q]), GFP_KERNEL);
352 if (!priv->rx_skb[q] || !priv->tx_skb[q])
353 goto error;
354
355 for (i = 0; i < priv->num_rx_ring[q]; i++) {
356 skb = netdev_alloc_skb(ndev, RX_BUF_SZ + RAVB_ALIGN - 1);
357 if (!skb)
358 goto error;
359 ravb_set_buffer_align(skb);
360 priv->rx_skb[q][i] = skb;
361 }
362
363 if (num_tx_desc > 1) {
364 /* Allocate rings for the aligned buffers */
365 priv->tx_align[q] = kmalloc(DPTR_ALIGN * priv->num_tx_ring[q] +
366 DPTR_ALIGN - 1, GFP_KERNEL);
367 if (!priv->tx_align[q])
368 goto error;
369 }
370
371 /* Allocate all RX descriptors. */
372 ring_size = sizeof(struct ravb_ex_rx_desc) * (priv->num_rx_ring[q] + 1);
373 priv->rx_ring[q] = dma_alloc_coherent(ndev->dev.parent, ring_size,
374 &priv->rx_desc_dma[q],
375 GFP_KERNEL);
376 if (!priv->rx_ring[q])
377 goto error;
378
379 priv->dirty_rx[q] = 0;
380
381 /* Allocate all TX descriptors. */
382 ring_size = sizeof(struct ravb_tx_desc) *
383 (priv->num_tx_ring[q] * num_tx_desc + 1);
384 priv->tx_ring[q] = dma_alloc_coherent(ndev->dev.parent, ring_size,
385 &priv->tx_desc_dma[q],
386 GFP_KERNEL);
387 if (!priv->tx_ring[q])
388 goto error;
389
390 return 0;
391
392error:
393 ravb_ring_free(ndev, q);
394
395 return -ENOMEM;
396}
397
398/* E-MAC init function */
399static void ravb_emac_init(struct net_device *ndev)
400{
401 /* Receive frame limit set register */
402 ravb_write(ndev, ndev->mtu + ETH_HLEN + VLAN_HLEN + ETH_FCS_LEN, RFLR);
403
404 /* EMAC Mode: PAUSE prohibition; Duplex; RX Checksum; TX; RX */
405 ravb_write(ndev, ECMR_ZPF | ECMR_DM |
406 (ndev->features & NETIF_F_RXCSUM ? ECMR_RCSC : 0) |
407 ECMR_TE | ECMR_RE, ECMR);
408
409 ravb_set_rate(ndev);
410
411 /* Set MAC address */
412 ravb_write(ndev,
413 (ndev->dev_addr[0] << 24) | (ndev->dev_addr[1] << 16) |
414 (ndev->dev_addr[2] << 8) | (ndev->dev_addr[3]), MAHR);
415 ravb_write(ndev,
416 (ndev->dev_addr[4] << 8) | (ndev->dev_addr[5]), MALR);
417
418 /* E-MAC status register clear */
419 ravb_write(ndev, ECSR_ICD | ECSR_MPD, ECSR);
420
421 /* E-MAC interrupt enable register */
422 ravb_write(ndev, ECSIPR_ICDIP | ECSIPR_MPDIP | ECSIPR_LCHNGIP, ECSIPR);
423}
424
425/* Device init function for Ethernet AVB */
426static int ravb_dmac_init(struct net_device *ndev)
427{
428 struct ravb_private *priv = netdev_priv(ndev);
429 int error;
430
431 /* Set CONFIG mode */
432 error = ravb_config(ndev);
433 if (error)
434 return error;
435
436 error = ravb_ring_init(ndev, RAVB_BE);
437 if (error)
438 return error;
439 error = ravb_ring_init(ndev, RAVB_NC);
440 if (error) {
441 ravb_ring_free(ndev, RAVB_BE);
442 return error;
443 }
444
445 /* Descriptor format */
446 ravb_ring_format(ndev, RAVB_BE);
447 ravb_ring_format(ndev, RAVB_NC);
448
449 /* Set AVB RX */
450 ravb_write(ndev,
451 RCR_EFFS | RCR_ENCF | RCR_ETS0 | RCR_ESF | 0x18000000, RCR);
452
453 /* Set FIFO size */
454 ravb_write(ndev, TGC_TQP_AVBMODE1 | 0x00112200, TGC);
455
456 /* Timestamp enable */
457 ravb_write(ndev, TCCR_TFEN, TCCR);
458
459 /* Interrupt init: */
460 if (priv->chip_id == RCAR_GEN3) {
461 /* Clear DIL.DPLx */
462 ravb_write(ndev, 0, DIL);
463 /* Set queue specific interrupt */
464 ravb_write(ndev, CIE_CRIE | CIE_CTIE | CIE_CL0M, CIE);
465 }
466 /* Frame receive */
467 ravb_write(ndev, RIC0_FRE0 | RIC0_FRE1, RIC0);
468 /* Disable FIFO full warning */
469 ravb_write(ndev, 0, RIC1);
470 /* Receive FIFO full error, descriptor empty */
471 ravb_write(ndev, RIC2_QFE0 | RIC2_QFE1 | RIC2_RFFE, RIC2);
472 /* Frame transmitted, timestamp FIFO updated */
473 ravb_write(ndev, TIC_FTE0 | TIC_FTE1 | TIC_TFUE, TIC);
474
475 /* Setting the control will start the AVB-DMAC process. */
476 ravb_modify(ndev, CCC, CCC_OPC, CCC_OPC_OPERATION);
477
478 return 0;
479}
480
481static void ravb_get_tx_tstamp(struct net_device *ndev)
482{
483 struct ravb_private *priv = netdev_priv(ndev);
484 struct ravb_tstamp_skb *ts_skb, *ts_skb2;
485 struct skb_shared_hwtstamps shhwtstamps;
486 struct sk_buff *skb;
487 struct timespec64 ts;
488 u16 tag, tfa_tag;
489 int count;
490 u32 tfa2;
491
492 count = (ravb_read(ndev, TSR) & TSR_TFFL) >> 8;
493 while (count--) {
494 tfa2 = ravb_read(ndev, TFA2);
495 tfa_tag = (tfa2 & TFA2_TST) >> 16;
496 ts.tv_nsec = (u64)ravb_read(ndev, TFA0);
497 ts.tv_sec = ((u64)(tfa2 & TFA2_TSV) << 32) |
498 ravb_read(ndev, TFA1);
499 memset(&shhwtstamps, 0, sizeof(shhwtstamps));
500 shhwtstamps.hwtstamp = timespec64_to_ktime(ts);
501 list_for_each_entry_safe(ts_skb, ts_skb2, &priv->ts_skb_list,
502 list) {
503 skb = ts_skb->skb;
504 tag = ts_skb->tag;
505 list_del(&ts_skb->list);
506 kfree(ts_skb);
507 if (tag == tfa_tag) {
508 skb_tstamp_tx(skb, &shhwtstamps);
509 dev_consume_skb_any(skb);
510 break;
511 } else {
512 dev_kfree_skb_any(skb);
513 }
514 }
515 ravb_modify(ndev, TCCR, TCCR_TFR, TCCR_TFR);
516 }
517}
518
519static void ravb_rx_csum(struct sk_buff *skb)
520{
521 u8 *hw_csum;
522
523 /* The hardware checksum is contained in sizeof(__sum16) (2) bytes
524 * appended to packet data
525 */
526 if (unlikely(skb->len < sizeof(__sum16)))
527 return;
528 hw_csum = skb_tail_pointer(skb) - sizeof(__sum16);
529 skb->csum = csum_unfold((__force __sum16)get_unaligned_le16(hw_csum));
530 skb->ip_summed = CHECKSUM_COMPLETE;
531 skb_trim(skb, skb->len - sizeof(__sum16));
532}
533
534/* Packet receive function for Ethernet AVB */
535static bool ravb_rx(struct net_device *ndev, int *quota, int q)
536{
537 struct ravb_private *priv = netdev_priv(ndev);
538 int entry = priv->cur_rx[q] % priv->num_rx_ring[q];
539 int boguscnt = (priv->dirty_rx[q] + priv->num_rx_ring[q]) -
540 priv->cur_rx[q];
541 struct net_device_stats *stats = &priv->stats[q];
542 struct ravb_ex_rx_desc *desc;
543 struct sk_buff *skb;
544 dma_addr_t dma_addr;
545 struct timespec64 ts;
546 u8 desc_status;
547 u16 pkt_len;
548 int limit;
549
550 boguscnt = min(boguscnt, *quota);
551 limit = boguscnt;
552 desc = &priv->rx_ring[q][entry];
553 while (desc->die_dt != DT_FEMPTY) {
554 /* Descriptor type must be checked before all other reads */
555 dma_rmb();
556 desc_status = desc->msc;
557 pkt_len = le16_to_cpu(desc->ds_cc) & RX_DS;
558
559 if (--boguscnt < 0)
560 break;
561
562 /* We use 0-byte descriptors to mark the DMA mapping errors */
563 if (!pkt_len)
564 continue;
565
566 if (desc_status & MSC_MC)
567 stats->multicast++;
568
569 if (desc_status & (MSC_CRC | MSC_RFE | MSC_RTSF | MSC_RTLF |
570 MSC_CEEF)) {
571 stats->rx_errors++;
572 if (desc_status & MSC_CRC)
573 stats->rx_crc_errors++;
574 if (desc_status & MSC_RFE)
575 stats->rx_frame_errors++;
576 if (desc_status & (MSC_RTLF | MSC_RTSF))
577 stats->rx_length_errors++;
578 if (desc_status & MSC_CEEF)
579 stats->rx_missed_errors++;
580 } else {
581 u32 get_ts = priv->tstamp_rx_ctrl & RAVB_RXTSTAMP_TYPE;
582
583 skb = priv->rx_skb[q][entry];
584 priv->rx_skb[q][entry] = NULL;
585 dma_unmap_single(ndev->dev.parent, le32_to_cpu(desc->dptr),
586 RX_BUF_SZ,
587 DMA_FROM_DEVICE);
588 get_ts &= (q == RAVB_NC) ?
589 RAVB_RXTSTAMP_TYPE_V2_L2_EVENT :
590 ~RAVB_RXTSTAMP_TYPE_V2_L2_EVENT;
591 if (get_ts) {
592 struct skb_shared_hwtstamps *shhwtstamps;
593
594 shhwtstamps = skb_hwtstamps(skb);
595 memset(shhwtstamps, 0, sizeof(*shhwtstamps));
596 ts.tv_sec = ((u64) le16_to_cpu(desc->ts_sh) <<
597 32) | le32_to_cpu(desc->ts_sl);
598 ts.tv_nsec = le32_to_cpu(desc->ts_n);
599 shhwtstamps->hwtstamp = timespec64_to_ktime(ts);
600 }
601
602 skb_put(skb, pkt_len);
603 skb->protocol = eth_type_trans(skb, ndev);
604 if (ndev->features & NETIF_F_RXCSUM)
605 ravb_rx_csum(skb);
606 napi_gro_receive(&priv->napi[q], skb);
607 stats->rx_packets++;
608 stats->rx_bytes += pkt_len;
609 }
610
611 entry = (++priv->cur_rx[q]) % priv->num_rx_ring[q];
612 desc = &priv->rx_ring[q][entry];
613 }
614
615 /* Refill the RX ring buffers. */
616 for (; priv->cur_rx[q] - priv->dirty_rx[q] > 0; priv->dirty_rx[q]++) {
617 entry = priv->dirty_rx[q] % priv->num_rx_ring[q];
618 desc = &priv->rx_ring[q][entry];
619 desc->ds_cc = cpu_to_le16(RX_BUF_SZ);
620
621 if (!priv->rx_skb[q][entry]) {
622 skb = netdev_alloc_skb(ndev,
623 RX_BUF_SZ +
624 RAVB_ALIGN - 1);
625 if (!skb)
626 break; /* Better luck next round. */
627 ravb_set_buffer_align(skb);
628 dma_addr = dma_map_single(ndev->dev.parent, skb->data,
629 le16_to_cpu(desc->ds_cc),
630 DMA_FROM_DEVICE);
631 skb_checksum_none_assert(skb);
632 /* We just set the data size to 0 for a failed mapping
633 * which should prevent DMA from happening...
634 */
635 if (dma_mapping_error(ndev->dev.parent, dma_addr))
636 desc->ds_cc = cpu_to_le16(0);
637 desc->dptr = cpu_to_le32(dma_addr);
638 priv->rx_skb[q][entry] = skb;
639 }
640 /* Descriptor type must be set after all the above writes */
641 dma_wmb();
642 desc->die_dt = DT_FEMPTY;
643 }
644
645 *quota -= limit - (++boguscnt);
646
647 return boguscnt <= 0;
648}
649
650static void ravb_rcv_snd_disable(struct net_device *ndev)
651{
652 /* Disable TX and RX */
653 ravb_modify(ndev, ECMR, ECMR_RE | ECMR_TE, 0);
654}
655
656static void ravb_rcv_snd_enable(struct net_device *ndev)
657{
658 /* Enable TX and RX */
659 ravb_modify(ndev, ECMR, ECMR_RE | ECMR_TE, ECMR_RE | ECMR_TE);
660}
661
662/* function for waiting dma process finished */
663static int ravb_stop_dma(struct net_device *ndev)
664{
665 int error;
666
667 /* Wait for stopping the hardware TX process */
668 error = ravb_wait(ndev, TCCR,
669 TCCR_TSRQ0 | TCCR_TSRQ1 | TCCR_TSRQ2 | TCCR_TSRQ3, 0);
670 if (error)
671 return error;
672
673 error = ravb_wait(ndev, CSR, CSR_TPO0 | CSR_TPO1 | CSR_TPO2 | CSR_TPO3,
674 0);
675 if (error)
676 return error;
677
678 /* Stop the E-MAC's RX/TX processes. */
679 ravb_rcv_snd_disable(ndev);
680
681 /* Wait for stopping the RX DMA process */
682 error = ravb_wait(ndev, CSR, CSR_RPO, 0);
683 if (error)
684 return error;
685
686 /* Stop AVB-DMAC process */
687 return ravb_config(ndev);
688}
689
690/* E-MAC interrupt handler */
691static void ravb_emac_interrupt_unlocked(struct net_device *ndev)
692{
693 struct ravb_private *priv = netdev_priv(ndev);
694 u32 ecsr, psr;
695
696 ecsr = ravb_read(ndev, ECSR);
697 ravb_write(ndev, ecsr, ECSR); /* clear interrupt */
698
699 if (ecsr & ECSR_MPD)
700 pm_wakeup_event(&priv->pdev->dev, 0);
701 if (ecsr & ECSR_ICD)
702 ndev->stats.tx_carrier_errors++;
703 if (ecsr & ECSR_LCHNG) {
704 /* Link changed */
705 if (priv->no_avb_link)
706 return;
707 psr = ravb_read(ndev, PSR);
708 if (priv->avb_link_active_low)
709 psr ^= PSR_LMON;
710 if (!(psr & PSR_LMON)) {
711 /* DIsable RX and TX */
712 ravb_rcv_snd_disable(ndev);
713 } else {
714 /* Enable RX and TX */
715 ravb_rcv_snd_enable(ndev);
716 }
717 }
718}
719
720static irqreturn_t ravb_emac_interrupt(int irq, void *dev_id)
721{
722 struct net_device *ndev = dev_id;
723 struct ravb_private *priv = netdev_priv(ndev);
724
725 spin_lock(&priv->lock);
726 ravb_emac_interrupt_unlocked(ndev);
727 spin_unlock(&priv->lock);
728 return IRQ_HANDLED;
729}
730
731/* Error interrupt handler */
732static void ravb_error_interrupt(struct net_device *ndev)
733{
734 struct ravb_private *priv = netdev_priv(ndev);
735 u32 eis, ris2;
736
737 eis = ravb_read(ndev, EIS);
738 ravb_write(ndev, ~(EIS_QFS | EIS_RESERVED), EIS);
739 if (eis & EIS_QFS) {
740 ris2 = ravb_read(ndev, RIS2);
741 ravb_write(ndev, ~(RIS2_QFF0 | RIS2_RFFF | RIS2_RESERVED),
742 RIS2);
743
744 /* Receive Descriptor Empty int */
745 if (ris2 & RIS2_QFF0)
746 priv->stats[RAVB_BE].rx_over_errors++;
747
748 /* Receive Descriptor Empty int */
749 if (ris2 & RIS2_QFF1)
750 priv->stats[RAVB_NC].rx_over_errors++;
751
752 /* Receive FIFO Overflow int */
753 if (ris2 & RIS2_RFFF)
754 priv->rx_fifo_errors++;
755 }
756}
757
758static bool ravb_queue_interrupt(struct net_device *ndev, int q)
759{
760 struct ravb_private *priv = netdev_priv(ndev);
761 u32 ris0 = ravb_read(ndev, RIS0);
762 u32 ric0 = ravb_read(ndev, RIC0);
763 u32 tis = ravb_read(ndev, TIS);
764 u32 tic = ravb_read(ndev, TIC);
765
766 if (((ris0 & ric0) & BIT(q)) || ((tis & tic) & BIT(q))) {
767 if (napi_schedule_prep(&priv->napi[q])) {
768 /* Mask RX and TX interrupts */
769 if (priv->chip_id == RCAR_GEN2) {
770 ravb_write(ndev, ric0 & ~BIT(q), RIC0);
771 ravb_write(ndev, tic & ~BIT(q), TIC);
772 } else {
773 ravb_write(ndev, BIT(q), RID0);
774 ravb_write(ndev, BIT(q), TID);
775 }
776 __napi_schedule(&priv->napi[q]);
777 } else {
778 netdev_warn(ndev,
779 "ignoring interrupt, rx status 0x%08x, rx mask 0x%08x,\n",
780 ris0, ric0);
781 netdev_warn(ndev,
782 " tx status 0x%08x, tx mask 0x%08x.\n",
783 tis, tic);
784 }
785 return true;
786 }
787 return false;
788}
789
790static bool ravb_timestamp_interrupt(struct net_device *ndev)
791{
792 u32 tis = ravb_read(ndev, TIS);
793
794 if (tis & TIS_TFUF) {
795 ravb_write(ndev, ~(TIS_TFUF | TIS_RESERVED), TIS);
796 ravb_get_tx_tstamp(ndev);
797 return true;
798 }
799 return false;
800}
801
802static irqreturn_t ravb_interrupt(int irq, void *dev_id)
803{
804 struct net_device *ndev = dev_id;
805 struct ravb_private *priv = netdev_priv(ndev);
806 irqreturn_t result = IRQ_NONE;
807 u32 iss;
808
809 spin_lock(&priv->lock);
810 /* Get interrupt status */
811 iss = ravb_read(ndev, ISS);
812
813 /* Received and transmitted interrupts */
814 if (iss & (ISS_FRS | ISS_FTS | ISS_TFUS)) {
815 int q;
816
817 /* Timestamp updated */
818 if (ravb_timestamp_interrupt(ndev))
819 result = IRQ_HANDLED;
820
821 /* Network control and best effort queue RX/TX */
822 for (q = RAVB_NC; q >= RAVB_BE; q--) {
823 if (ravb_queue_interrupt(ndev, q))
824 result = IRQ_HANDLED;
825 }
826 }
827
828 /* E-MAC status summary */
829 if (iss & ISS_MS) {
830 ravb_emac_interrupt_unlocked(ndev);
831 result = IRQ_HANDLED;
832 }
833
834 /* Error status summary */
835 if (iss & ISS_ES) {
836 ravb_error_interrupt(ndev);
837 result = IRQ_HANDLED;
838 }
839
840 /* gPTP interrupt status summary */
841 if (iss & ISS_CGIS) {
842 ravb_ptp_interrupt(ndev);
843 result = IRQ_HANDLED;
844 }
845
846 spin_unlock(&priv->lock);
847 return result;
848}
849
850/* Timestamp/Error/gPTP interrupt handler */
851static irqreturn_t ravb_multi_interrupt(int irq, void *dev_id)
852{
853 struct net_device *ndev = dev_id;
854 struct ravb_private *priv = netdev_priv(ndev);
855 irqreturn_t result = IRQ_NONE;
856 u32 iss;
857
858 spin_lock(&priv->lock);
859 /* Get interrupt status */
860 iss = ravb_read(ndev, ISS);
861
862 /* Timestamp updated */
863 if ((iss & ISS_TFUS) && ravb_timestamp_interrupt(ndev))
864 result = IRQ_HANDLED;
865
866 /* Error status summary */
867 if (iss & ISS_ES) {
868 ravb_error_interrupt(ndev);
869 result = IRQ_HANDLED;
870 }
871
872 /* gPTP interrupt status summary */
873 if (iss & ISS_CGIS) {
874 ravb_ptp_interrupt(ndev);
875 result = IRQ_HANDLED;
876 }
877
878 spin_unlock(&priv->lock);
879 return result;
880}
881
882static irqreturn_t ravb_dma_interrupt(int irq, void *dev_id, int q)
883{
884 struct net_device *ndev = dev_id;
885 struct ravb_private *priv = netdev_priv(ndev);
886 irqreturn_t result = IRQ_NONE;
887
888 spin_lock(&priv->lock);
889
890 /* Network control/Best effort queue RX/TX */
891 if (ravb_queue_interrupt(ndev, q))
892 result = IRQ_HANDLED;
893
894 spin_unlock(&priv->lock);
895 return result;
896}
897
898static irqreturn_t ravb_be_interrupt(int irq, void *dev_id)
899{
900 return ravb_dma_interrupt(irq, dev_id, RAVB_BE);
901}
902
903static irqreturn_t ravb_nc_interrupt(int irq, void *dev_id)
904{
905 return ravb_dma_interrupt(irq, dev_id, RAVB_NC);
906}
907
908static int ravb_poll(struct napi_struct *napi, int budget)
909{
910 struct net_device *ndev = napi->dev;
911 struct ravb_private *priv = netdev_priv(ndev);
912 unsigned long flags;
913 int q = napi - priv->napi;
914 int mask = BIT(q);
915 int quota = budget;
916
917 /* Processing RX Descriptor Ring */
918 /* Clear RX interrupt */
919 ravb_write(ndev, ~(mask | RIS0_RESERVED), RIS0);
920 if (ravb_rx(ndev, "a, q))
921 goto out;
922
923 /* Processing TX Descriptor Ring */
924 spin_lock_irqsave(&priv->lock, flags);
925 /* Clear TX interrupt */
926 ravb_write(ndev, ~(mask | TIS_RESERVED), TIS);
927 ravb_tx_free(ndev, q, true);
928 netif_wake_subqueue(ndev, q);
929 spin_unlock_irqrestore(&priv->lock, flags);
930
931 napi_complete(napi);
932
933 /* Re-enable RX/TX interrupts */
934 spin_lock_irqsave(&priv->lock, flags);
935 if (priv->chip_id == RCAR_GEN2) {
936 ravb_modify(ndev, RIC0, mask, mask);
937 ravb_modify(ndev, TIC, mask, mask);
938 } else {
939 ravb_write(ndev, mask, RIE0);
940 ravb_write(ndev, mask, TIE);
941 }
942 spin_unlock_irqrestore(&priv->lock, flags);
943
944 /* Receive error message handling */
945 priv->rx_over_errors = priv->stats[RAVB_BE].rx_over_errors;
946 priv->rx_over_errors += priv->stats[RAVB_NC].rx_over_errors;
947 if (priv->rx_over_errors != ndev->stats.rx_over_errors)
948 ndev->stats.rx_over_errors = priv->rx_over_errors;
949 if (priv->rx_fifo_errors != ndev->stats.rx_fifo_errors)
950 ndev->stats.rx_fifo_errors = priv->rx_fifo_errors;
951out:
952 return budget - quota;
953}
954
955/* PHY state control function */
956static void ravb_adjust_link(struct net_device *ndev)
957{
958 struct ravb_private *priv = netdev_priv(ndev);
959 struct phy_device *phydev = ndev->phydev;
960 bool new_state = false;
961 unsigned long flags;
962
963 spin_lock_irqsave(&priv->lock, flags);
964
965 /* Disable TX and RX right over here, if E-MAC change is ignored */
966 if (priv->no_avb_link)
967 ravb_rcv_snd_disable(ndev);
968
969 if (phydev->link) {
970 if (phydev->speed != priv->speed) {
971 new_state = true;
972 priv->speed = phydev->speed;
973 ravb_set_rate(ndev);
974 }
975 if (!priv->link) {
976 ravb_modify(ndev, ECMR, ECMR_TXF, 0);
977 new_state = true;
978 priv->link = phydev->link;
979 }
980 } else if (priv->link) {
981 new_state = true;
982 priv->link = 0;
983 priv->speed = 0;
984 }
985
986 /* Enable TX and RX right over here, if E-MAC change is ignored */
987 if (priv->no_avb_link && phydev->link)
988 ravb_rcv_snd_enable(ndev);
989
990 spin_unlock_irqrestore(&priv->lock, flags);
991
992 if (new_state && netif_msg_link(priv))
993 phy_print_status(phydev);
994}
995
996static const struct soc_device_attribute r8a7795es10[] = {
997 { .soc_id = "r8a7795", .revision = "ES1.0", },
998 { /* sentinel */ }
999};
1000
1001/* PHY init function */
1002static int ravb_phy_init(struct net_device *ndev)
1003{
1004 struct device_node *np = ndev->dev.parent->of_node;
1005 struct ravb_private *priv = netdev_priv(ndev);
1006 struct phy_device *phydev;
1007 struct device_node *pn;
1008 phy_interface_t iface;
1009 int err;
1010
1011 priv->link = 0;
1012 priv->speed = 0;
1013
1014 /* Try connecting to PHY */
1015 pn = of_parse_phandle(np, "phy-handle", 0);
1016 if (!pn) {
1017 /* In the case of a fixed PHY, the DT node associated
1018 * to the PHY is the Ethernet MAC DT node.
1019 */
1020 if (of_phy_is_fixed_link(np)) {
1021 err = of_phy_register_fixed_link(np);
1022 if (err)
1023 return err;
1024 }
1025 pn = of_node_get(np);
1026 }
1027
1028 iface = priv->rgmii_override ? PHY_INTERFACE_MODE_RGMII
1029 : priv->phy_interface;
1030 phydev = of_phy_connect(ndev, pn, ravb_adjust_link, 0, iface);
1031 of_node_put(pn);
1032 if (!phydev) {
1033 netdev_err(ndev, "failed to connect PHY\n");
1034 err = -ENOENT;
1035 goto err_deregister_fixed_link;
1036 }
1037
1038 /* This driver only support 10/100Mbit speeds on R-Car H3 ES1.0
1039 * at this time.
1040 */
1041 if (soc_device_match(r8a7795es10)) {
1042 err = phy_set_max_speed(phydev, SPEED_100);
1043 if (err) {
1044 netdev_err(ndev, "failed to limit PHY to 100Mbit/s\n");
1045 goto err_phy_disconnect;
1046 }
1047
1048 netdev_info(ndev, "limited PHY to 100Mbit/s\n");
1049 }
1050
1051 /* 10BASE, Pause and Asym Pause is not supported */
1052 phy_remove_link_mode(phydev, ETHTOOL_LINK_MODE_10baseT_Half_BIT);
1053 phy_remove_link_mode(phydev, ETHTOOL_LINK_MODE_10baseT_Full_BIT);
1054 phy_remove_link_mode(phydev, ETHTOOL_LINK_MODE_Pause_BIT);
1055 phy_remove_link_mode(phydev, ETHTOOL_LINK_MODE_Asym_Pause_BIT);
1056
1057 /* Half Duplex is not supported */
1058 phy_remove_link_mode(phydev, ETHTOOL_LINK_MODE_1000baseT_Half_BIT);
1059 phy_remove_link_mode(phydev, ETHTOOL_LINK_MODE_100baseT_Half_BIT);
1060
1061 phy_attached_info(phydev);
1062
1063 return 0;
1064
1065err_phy_disconnect:
1066 phy_disconnect(phydev);
1067err_deregister_fixed_link:
1068 if (of_phy_is_fixed_link(np))
1069 of_phy_deregister_fixed_link(np);
1070
1071 return err;
1072}
1073
1074/* PHY control start function */
1075static int ravb_phy_start(struct net_device *ndev)
1076{
1077 int error;
1078
1079 error = ravb_phy_init(ndev);
1080 if (error)
1081 return error;
1082
1083 phy_start(ndev->phydev);
1084
1085 return 0;
1086}
1087
1088static u32 ravb_get_msglevel(struct net_device *ndev)
1089{
1090 struct ravb_private *priv = netdev_priv(ndev);
1091
1092 return priv->msg_enable;
1093}
1094
1095static void ravb_set_msglevel(struct net_device *ndev, u32 value)
1096{
1097 struct ravb_private *priv = netdev_priv(ndev);
1098
1099 priv->msg_enable = value;
1100}
1101
1102static const char ravb_gstrings_stats[][ETH_GSTRING_LEN] = {
1103 "rx_queue_0_current",
1104 "tx_queue_0_current",
1105 "rx_queue_0_dirty",
1106 "tx_queue_0_dirty",
1107 "rx_queue_0_packets",
1108 "tx_queue_0_packets",
1109 "rx_queue_0_bytes",
1110 "tx_queue_0_bytes",
1111 "rx_queue_0_mcast_packets",
1112 "rx_queue_0_errors",
1113 "rx_queue_0_crc_errors",
1114 "rx_queue_0_frame_errors",
1115 "rx_queue_0_length_errors",
1116 "rx_queue_0_missed_errors",
1117 "rx_queue_0_over_errors",
1118
1119 "rx_queue_1_current",
1120 "tx_queue_1_current",
1121 "rx_queue_1_dirty",
1122 "tx_queue_1_dirty",
1123 "rx_queue_1_packets",
1124 "tx_queue_1_packets",
1125 "rx_queue_1_bytes",
1126 "tx_queue_1_bytes",
1127 "rx_queue_1_mcast_packets",
1128 "rx_queue_1_errors",
1129 "rx_queue_1_crc_errors",
1130 "rx_queue_1_frame_errors",
1131 "rx_queue_1_length_errors",
1132 "rx_queue_1_missed_errors",
1133 "rx_queue_1_over_errors",
1134};
1135
1136#define RAVB_STATS_LEN ARRAY_SIZE(ravb_gstrings_stats)
1137
1138static int ravb_get_sset_count(struct net_device *netdev, int sset)
1139{
1140 switch (sset) {
1141 case ETH_SS_STATS:
1142 return RAVB_STATS_LEN;
1143 default:
1144 return -EOPNOTSUPP;
1145 }
1146}
1147
1148static void ravb_get_ethtool_stats(struct net_device *ndev,
1149 struct ethtool_stats *estats, u64 *data)
1150{
1151 struct ravb_private *priv = netdev_priv(ndev);
1152 int i = 0;
1153 int q;
1154
1155 /* Device-specific stats */
1156 for (q = RAVB_BE; q < NUM_RX_QUEUE; q++) {
1157 struct net_device_stats *stats = &priv->stats[q];
1158
1159 data[i++] = priv->cur_rx[q];
1160 data[i++] = priv->cur_tx[q];
1161 data[i++] = priv->dirty_rx[q];
1162 data[i++] = priv->dirty_tx[q];
1163 data[i++] = stats->rx_packets;
1164 data[i++] = stats->tx_packets;
1165 data[i++] = stats->rx_bytes;
1166 data[i++] = stats->tx_bytes;
1167 data[i++] = stats->multicast;
1168 data[i++] = stats->rx_errors;
1169 data[i++] = stats->rx_crc_errors;
1170 data[i++] = stats->rx_frame_errors;
1171 data[i++] = stats->rx_length_errors;
1172 data[i++] = stats->rx_missed_errors;
1173 data[i++] = stats->rx_over_errors;
1174 }
1175}
1176
1177static void ravb_get_strings(struct net_device *ndev, u32 stringset, u8 *data)
1178{
1179 switch (stringset) {
1180 case ETH_SS_STATS:
1181 memcpy(data, ravb_gstrings_stats, sizeof(ravb_gstrings_stats));
1182 break;
1183 }
1184}
1185
1186static void ravb_get_ringparam(struct net_device *ndev,
1187 struct ethtool_ringparam *ring)
1188{
1189 struct ravb_private *priv = netdev_priv(ndev);
1190
1191 ring->rx_max_pending = BE_RX_RING_MAX;
1192 ring->tx_max_pending = BE_TX_RING_MAX;
1193 ring->rx_pending = priv->num_rx_ring[RAVB_BE];
1194 ring->tx_pending = priv->num_tx_ring[RAVB_BE];
1195}
1196
1197static int ravb_set_ringparam(struct net_device *ndev,
1198 struct ethtool_ringparam *ring)
1199{
1200 struct ravb_private *priv = netdev_priv(ndev);
1201 int error;
1202
1203 if (ring->tx_pending > BE_TX_RING_MAX ||
1204 ring->rx_pending > BE_RX_RING_MAX ||
1205 ring->tx_pending < BE_TX_RING_MIN ||
1206 ring->rx_pending < BE_RX_RING_MIN)
1207 return -EINVAL;
1208 if (ring->rx_mini_pending || ring->rx_jumbo_pending)
1209 return -EINVAL;
1210
1211 if (netif_running(ndev)) {
1212 netif_device_detach(ndev);
1213 /* Stop PTP Clock driver */
1214 if (priv->chip_id == RCAR_GEN2)
1215 ravb_ptp_stop(ndev);
1216 /* Wait for DMA stopping */
1217 error = ravb_stop_dma(ndev);
1218 if (error) {
1219 netdev_err(ndev,
1220 "cannot set ringparam! Any AVB processes are still running?\n");
1221 return error;
1222 }
1223 synchronize_irq(ndev->irq);
1224
1225 /* Free all the skb's in the RX queue and the DMA buffers. */
1226 ravb_ring_free(ndev, RAVB_BE);
1227 ravb_ring_free(ndev, RAVB_NC);
1228 }
1229
1230 /* Set new parameters */
1231 priv->num_rx_ring[RAVB_BE] = ring->rx_pending;
1232 priv->num_tx_ring[RAVB_BE] = ring->tx_pending;
1233
1234 if (netif_running(ndev)) {
1235 error = ravb_dmac_init(ndev);
1236 if (error) {
1237 netdev_err(ndev,
1238 "%s: ravb_dmac_init() failed, error %d\n",
1239 __func__, error);
1240 return error;
1241 }
1242
1243 ravb_emac_init(ndev);
1244
1245 /* Initialise PTP Clock driver */
1246 if (priv->chip_id == RCAR_GEN2)
1247 ravb_ptp_init(ndev, priv->pdev);
1248
1249 netif_device_attach(ndev);
1250 }
1251
1252 return 0;
1253}
1254
1255static int ravb_get_ts_info(struct net_device *ndev,
1256 struct ethtool_ts_info *info)
1257{
1258 struct ravb_private *priv = netdev_priv(ndev);
1259
1260 info->so_timestamping =
1261 SOF_TIMESTAMPING_TX_SOFTWARE |
1262 SOF_TIMESTAMPING_RX_SOFTWARE |
1263 SOF_TIMESTAMPING_SOFTWARE |
1264 SOF_TIMESTAMPING_TX_HARDWARE |
1265 SOF_TIMESTAMPING_RX_HARDWARE |
1266 SOF_TIMESTAMPING_RAW_HARDWARE;
1267 info->tx_types = (1 << HWTSTAMP_TX_OFF) | (1 << HWTSTAMP_TX_ON);
1268 info->rx_filters =
1269 (1 << HWTSTAMP_FILTER_NONE) |
1270 (1 << HWTSTAMP_FILTER_PTP_V2_L2_EVENT) |
1271 (1 << HWTSTAMP_FILTER_ALL);
1272 info->phc_index = ptp_clock_index(priv->ptp.clock);
1273
1274 return 0;
1275}
1276
1277static void ravb_get_wol(struct net_device *ndev, struct ethtool_wolinfo *wol)
1278{
1279 struct ravb_private *priv = netdev_priv(ndev);
1280
1281 wol->supported = WAKE_MAGIC;
1282 wol->wolopts = priv->wol_enabled ? WAKE_MAGIC : 0;
1283}
1284
1285static int ravb_set_wol(struct net_device *ndev, struct ethtool_wolinfo *wol)
1286{
1287 struct ravb_private *priv = netdev_priv(ndev);
1288
1289 if (wol->wolopts & ~WAKE_MAGIC)
1290 return -EOPNOTSUPP;
1291
1292 priv->wol_enabled = !!(wol->wolopts & WAKE_MAGIC);
1293
1294 device_set_wakeup_enable(&priv->pdev->dev, priv->wol_enabled);
1295
1296 return 0;
1297}
1298
1299static const struct ethtool_ops ravb_ethtool_ops = {
1300 .nway_reset = phy_ethtool_nway_reset,
1301 .get_msglevel = ravb_get_msglevel,
1302 .set_msglevel = ravb_set_msglevel,
1303 .get_link = ethtool_op_get_link,
1304 .get_strings = ravb_get_strings,
1305 .get_ethtool_stats = ravb_get_ethtool_stats,
1306 .get_sset_count = ravb_get_sset_count,
1307 .get_ringparam = ravb_get_ringparam,
1308 .set_ringparam = ravb_set_ringparam,
1309 .get_ts_info = ravb_get_ts_info,
1310 .get_link_ksettings = phy_ethtool_get_link_ksettings,
1311 .set_link_ksettings = phy_ethtool_set_link_ksettings,
1312 .get_wol = ravb_get_wol,
1313 .set_wol = ravb_set_wol,
1314};
1315
1316static inline int ravb_hook_irq(unsigned int irq, irq_handler_t handler,
1317 struct net_device *ndev, struct device *dev,
1318 const char *ch)
1319{
1320 char *name;
1321 int error;
1322
1323 name = devm_kasprintf(dev, GFP_KERNEL, "%s:%s", ndev->name, ch);
1324 if (!name)
1325 return -ENOMEM;
1326 error = request_irq(irq, handler, 0, name, ndev);
1327 if (error)
1328 netdev_err(ndev, "cannot request IRQ %s\n", name);
1329
1330 return error;
1331}
1332
1333/* Network device open function for Ethernet AVB */
1334static int ravb_open(struct net_device *ndev)
1335{
1336 struct ravb_private *priv = netdev_priv(ndev);
1337 struct platform_device *pdev = priv->pdev;
1338 struct device *dev = &pdev->dev;
1339 int error;
1340
1341 napi_enable(&priv->napi[RAVB_BE]);
1342 napi_enable(&priv->napi[RAVB_NC]);
1343
1344 if (priv->chip_id == RCAR_GEN2) {
1345 error = request_irq(ndev->irq, ravb_interrupt, IRQF_SHARED,
1346 ndev->name, ndev);
1347 if (error) {
1348 netdev_err(ndev, "cannot request IRQ\n");
1349 goto out_napi_off;
1350 }
1351 } else {
1352 error = ravb_hook_irq(ndev->irq, ravb_multi_interrupt, ndev,
1353 dev, "ch22:multi");
1354 if (error)
1355 goto out_napi_off;
1356 error = ravb_hook_irq(priv->emac_irq, ravb_emac_interrupt, ndev,
1357 dev, "ch24:emac");
1358 if (error)
1359 goto out_free_irq;
1360 error = ravb_hook_irq(priv->rx_irqs[RAVB_BE], ravb_be_interrupt,
1361 ndev, dev, "ch0:rx_be");
1362 if (error)
1363 goto out_free_irq_emac;
1364 error = ravb_hook_irq(priv->tx_irqs[RAVB_BE], ravb_be_interrupt,
1365 ndev, dev, "ch18:tx_be");
1366 if (error)
1367 goto out_free_irq_be_rx;
1368 error = ravb_hook_irq(priv->rx_irqs[RAVB_NC], ravb_nc_interrupt,
1369 ndev, dev, "ch1:rx_nc");
1370 if (error)
1371 goto out_free_irq_be_tx;
1372 error = ravb_hook_irq(priv->tx_irqs[RAVB_NC], ravb_nc_interrupt,
1373 ndev, dev, "ch19:tx_nc");
1374 if (error)
1375 goto out_free_irq_nc_rx;
1376 }
1377
1378 /* Device init */
1379 error = ravb_dmac_init(ndev);
1380 if (error)
1381 goto out_free_irq_nc_tx;
1382 ravb_emac_init(ndev);
1383
1384 /* Initialise PTP Clock driver */
1385 if (priv->chip_id == RCAR_GEN2)
1386 ravb_ptp_init(ndev, priv->pdev);
1387
1388 netif_tx_start_all_queues(ndev);
1389
1390 /* PHY control start */
1391 error = ravb_phy_start(ndev);
1392 if (error)
1393 goto out_ptp_stop;
1394
1395 return 0;
1396
1397out_ptp_stop:
1398 /* Stop PTP Clock driver */
1399 if (priv->chip_id == RCAR_GEN2)
1400 ravb_ptp_stop(ndev);
1401out_free_irq_nc_tx:
1402 if (priv->chip_id == RCAR_GEN2)
1403 goto out_free_irq;
1404 free_irq(priv->tx_irqs[RAVB_NC], ndev);
1405out_free_irq_nc_rx:
1406 free_irq(priv->rx_irqs[RAVB_NC], ndev);
1407out_free_irq_be_tx:
1408 free_irq(priv->tx_irqs[RAVB_BE], ndev);
1409out_free_irq_be_rx:
1410 free_irq(priv->rx_irqs[RAVB_BE], ndev);
1411out_free_irq_emac:
1412 free_irq(priv->emac_irq, ndev);
1413out_free_irq:
1414 free_irq(ndev->irq, ndev);
1415out_napi_off:
1416 napi_disable(&priv->napi[RAVB_NC]);
1417 napi_disable(&priv->napi[RAVB_BE]);
1418 return error;
1419}
1420
1421/* Timeout function for Ethernet AVB */
1422static void ravb_tx_timeout(struct net_device *ndev, unsigned int txqueue)
1423{
1424 struct ravb_private *priv = netdev_priv(ndev);
1425
1426 netif_err(priv, tx_err, ndev,
1427 "transmit timed out, status %08x, resetting...\n",
1428 ravb_read(ndev, ISS));
1429
1430 /* tx_errors count up */
1431 ndev->stats.tx_errors++;
1432
1433 schedule_work(&priv->work);
1434}
1435
1436static void ravb_tx_timeout_work(struct work_struct *work)
1437{
1438 struct ravb_private *priv = container_of(work, struct ravb_private,
1439 work);
1440 struct net_device *ndev = priv->ndev;
1441 int error;
1442
1443 netif_tx_stop_all_queues(ndev);
1444
1445 /* Stop PTP Clock driver */
1446 if (priv->chip_id == RCAR_GEN2)
1447 ravb_ptp_stop(ndev);
1448
1449 /* Wait for DMA stopping */
1450 if (ravb_stop_dma(ndev)) {
1451 /* If ravb_stop_dma() fails, the hardware is still operating
1452 * for TX and/or RX. So, this should not call the following
1453 * functions because ravb_dmac_init() is possible to fail too.
1454 * Also, this should not retry ravb_stop_dma() again and again
1455 * here because it's possible to wait forever. So, this just
1456 * re-enables the TX and RX and skip the following
1457 * re-initialization procedure.
1458 */
1459 ravb_rcv_snd_enable(ndev);
1460 goto out;
1461 }
1462
1463 ravb_ring_free(ndev, RAVB_BE);
1464 ravb_ring_free(ndev, RAVB_NC);
1465
1466 /* Device init */
1467 error = ravb_dmac_init(ndev);
1468 if (error) {
1469 /* If ravb_dmac_init() fails, descriptors are freed. So, this
1470 * should return here to avoid re-enabling the TX and RX in
1471 * ravb_emac_init().
1472 */
1473 netdev_err(ndev, "%s: ravb_dmac_init() failed, error %d\n",
1474 __func__, error);
1475 return;
1476 }
1477 ravb_emac_init(ndev);
1478
1479out:
1480 /* Initialise PTP Clock driver */
1481 if (priv->chip_id == RCAR_GEN2)
1482 ravb_ptp_init(ndev, priv->pdev);
1483
1484 netif_tx_start_all_queues(ndev);
1485}
1486
1487/* Packet transmit function for Ethernet AVB */
1488static netdev_tx_t ravb_start_xmit(struct sk_buff *skb, struct net_device *ndev)
1489{
1490 struct ravb_private *priv = netdev_priv(ndev);
1491 int num_tx_desc = priv->num_tx_desc;
1492 u16 q = skb_get_queue_mapping(skb);
1493 struct ravb_tstamp_skb *ts_skb;
1494 struct ravb_tx_desc *desc;
1495 unsigned long flags;
1496 u32 dma_addr;
1497 void *buffer;
1498 u32 entry;
1499 u32 len;
1500
1501 spin_lock_irqsave(&priv->lock, flags);
1502 if (priv->cur_tx[q] - priv->dirty_tx[q] > (priv->num_tx_ring[q] - 1) *
1503 num_tx_desc) {
1504 netif_err(priv, tx_queued, ndev,
1505 "still transmitting with the full ring!\n");
1506 netif_stop_subqueue(ndev, q);
1507 spin_unlock_irqrestore(&priv->lock, flags);
1508 return NETDEV_TX_BUSY;
1509 }
1510
1511 if (skb_put_padto(skb, ETH_ZLEN))
1512 goto exit;
1513
1514 entry = priv->cur_tx[q] % (priv->num_tx_ring[q] * num_tx_desc);
1515 priv->tx_skb[q][entry / num_tx_desc] = skb;
1516
1517 if (num_tx_desc > 1) {
1518 buffer = PTR_ALIGN(priv->tx_align[q], DPTR_ALIGN) +
1519 entry / num_tx_desc * DPTR_ALIGN;
1520 len = PTR_ALIGN(skb->data, DPTR_ALIGN) - skb->data;
1521
1522 /* Zero length DMA descriptors are problematic as they seem
1523 * to terminate DMA transfers. Avoid them by simply using a
1524 * length of DPTR_ALIGN (4) when skb data is aligned to
1525 * DPTR_ALIGN.
1526 *
1527 * As skb is guaranteed to have at least ETH_ZLEN (60)
1528 * bytes of data by the call to skb_put_padto() above this
1529 * is safe with respect to both the length of the first DMA
1530 * descriptor (len) overflowing the available data and the
1531 * length of the second DMA descriptor (skb->len - len)
1532 * being negative.
1533 */
1534 if (len == 0)
1535 len = DPTR_ALIGN;
1536
1537 memcpy(buffer, skb->data, len);
1538 dma_addr = dma_map_single(ndev->dev.parent, buffer, len,
1539 DMA_TO_DEVICE);
1540 if (dma_mapping_error(ndev->dev.parent, dma_addr))
1541 goto drop;
1542
1543 desc = &priv->tx_ring[q][entry];
1544 desc->ds_tagl = cpu_to_le16(len);
1545 desc->dptr = cpu_to_le32(dma_addr);
1546
1547 buffer = skb->data + len;
1548 len = skb->len - len;
1549 dma_addr = dma_map_single(ndev->dev.parent, buffer, len,
1550 DMA_TO_DEVICE);
1551 if (dma_mapping_error(ndev->dev.parent, dma_addr))
1552 goto unmap;
1553
1554 desc++;
1555 } else {
1556 desc = &priv->tx_ring[q][entry];
1557 len = skb->len;
1558 dma_addr = dma_map_single(ndev->dev.parent, skb->data, skb->len,
1559 DMA_TO_DEVICE);
1560 if (dma_mapping_error(ndev->dev.parent, dma_addr))
1561 goto drop;
1562 }
1563 desc->ds_tagl = cpu_to_le16(len);
1564 desc->dptr = cpu_to_le32(dma_addr);
1565
1566 /* TX timestamp required */
1567 if (q == RAVB_NC) {
1568 ts_skb = kmalloc(sizeof(*ts_skb), GFP_ATOMIC);
1569 if (!ts_skb) {
1570 if (num_tx_desc > 1) {
1571 desc--;
1572 dma_unmap_single(ndev->dev.parent, dma_addr,
1573 len, DMA_TO_DEVICE);
1574 }
1575 goto unmap;
1576 }
1577 ts_skb->skb = skb_get(skb);
1578 ts_skb->tag = priv->ts_skb_tag++;
1579 priv->ts_skb_tag &= 0x3ff;
1580 list_add_tail(&ts_skb->list, &priv->ts_skb_list);
1581
1582 /* TAG and timestamp required flag */
1583 skb_shinfo(skb)->tx_flags |= SKBTX_IN_PROGRESS;
1584 desc->tagh_tsr = (ts_skb->tag >> 4) | TX_TSR;
1585 desc->ds_tagl |= cpu_to_le16(ts_skb->tag << 12);
1586 }
1587
1588 skb_tx_timestamp(skb);
1589 /* Descriptor type must be set after all the above writes */
1590 dma_wmb();
1591 if (num_tx_desc > 1) {
1592 desc->die_dt = DT_FEND;
1593 desc--;
1594 desc->die_dt = DT_FSTART;
1595 } else {
1596 desc->die_dt = DT_FSINGLE;
1597 }
1598 ravb_modify(ndev, TCCR, TCCR_TSRQ0 << q, TCCR_TSRQ0 << q);
1599
1600 priv->cur_tx[q] += num_tx_desc;
1601 if (priv->cur_tx[q] - priv->dirty_tx[q] >
1602 (priv->num_tx_ring[q] - 1) * num_tx_desc &&
1603 !ravb_tx_free(ndev, q, true))
1604 netif_stop_subqueue(ndev, q);
1605
1606exit:
1607 spin_unlock_irqrestore(&priv->lock, flags);
1608 return NETDEV_TX_OK;
1609
1610unmap:
1611 dma_unmap_single(ndev->dev.parent, le32_to_cpu(desc->dptr),
1612 le16_to_cpu(desc->ds_tagl), DMA_TO_DEVICE);
1613drop:
1614 dev_kfree_skb_any(skb);
1615 priv->tx_skb[q][entry / num_tx_desc] = NULL;
1616 goto exit;
1617}
1618
1619static u16 ravb_select_queue(struct net_device *ndev, struct sk_buff *skb,
1620 struct net_device *sb_dev)
1621{
1622 /* If skb needs TX timestamp, it is handled in network control queue */
1623 return (skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP) ? RAVB_NC :
1624 RAVB_BE;
1625
1626}
1627
1628static struct net_device_stats *ravb_get_stats(struct net_device *ndev)
1629{
1630 struct ravb_private *priv = netdev_priv(ndev);
1631 struct net_device_stats *nstats, *stats0, *stats1;
1632
1633 nstats = &ndev->stats;
1634 stats0 = &priv->stats[RAVB_BE];
1635 stats1 = &priv->stats[RAVB_NC];
1636
1637 if (priv->chip_id == RCAR_GEN3) {
1638 nstats->tx_dropped += ravb_read(ndev, TROCR);
1639 ravb_write(ndev, 0, TROCR); /* (write clear) */
1640 }
1641
1642 nstats->rx_packets = stats0->rx_packets + stats1->rx_packets;
1643 nstats->tx_packets = stats0->tx_packets + stats1->tx_packets;
1644 nstats->rx_bytes = stats0->rx_bytes + stats1->rx_bytes;
1645 nstats->tx_bytes = stats0->tx_bytes + stats1->tx_bytes;
1646 nstats->multicast = stats0->multicast + stats1->multicast;
1647 nstats->rx_errors = stats0->rx_errors + stats1->rx_errors;
1648 nstats->rx_crc_errors = stats0->rx_crc_errors + stats1->rx_crc_errors;
1649 nstats->rx_frame_errors =
1650 stats0->rx_frame_errors + stats1->rx_frame_errors;
1651 nstats->rx_length_errors =
1652 stats0->rx_length_errors + stats1->rx_length_errors;
1653 nstats->rx_missed_errors =
1654 stats0->rx_missed_errors + stats1->rx_missed_errors;
1655 nstats->rx_over_errors =
1656 stats0->rx_over_errors + stats1->rx_over_errors;
1657
1658 return nstats;
1659}
1660
1661/* Update promiscuous bit */
1662static void ravb_set_rx_mode(struct net_device *ndev)
1663{
1664 struct ravb_private *priv = netdev_priv(ndev);
1665 unsigned long flags;
1666
1667 spin_lock_irqsave(&priv->lock, flags);
1668 ravb_modify(ndev, ECMR, ECMR_PRM,
1669 ndev->flags & IFF_PROMISC ? ECMR_PRM : 0);
1670 spin_unlock_irqrestore(&priv->lock, flags);
1671}
1672
1673/* Device close function for Ethernet AVB */
1674static int ravb_close(struct net_device *ndev)
1675{
1676 struct device_node *np = ndev->dev.parent->of_node;
1677 struct ravb_private *priv = netdev_priv(ndev);
1678 struct ravb_tstamp_skb *ts_skb, *ts_skb2;
1679
1680 netif_tx_stop_all_queues(ndev);
1681
1682 /* Disable interrupts by clearing the interrupt masks. */
1683 ravb_write(ndev, 0, RIC0);
1684 ravb_write(ndev, 0, RIC2);
1685 ravb_write(ndev, 0, TIC);
1686
1687 /* Stop PTP Clock driver */
1688 if (priv->chip_id == RCAR_GEN2)
1689 ravb_ptp_stop(ndev);
1690
1691 /* Set the config mode to stop the AVB-DMAC's processes */
1692 if (ravb_stop_dma(ndev) < 0)
1693 netdev_err(ndev,
1694 "device will be stopped after h/w processes are done.\n");
1695
1696 /* Clear the timestamp list */
1697 list_for_each_entry_safe(ts_skb, ts_skb2, &priv->ts_skb_list, list) {
1698 list_del(&ts_skb->list);
1699 kfree_skb(ts_skb->skb);
1700 kfree(ts_skb);
1701 }
1702
1703 /* PHY disconnect */
1704 if (ndev->phydev) {
1705 phy_stop(ndev->phydev);
1706 phy_disconnect(ndev->phydev);
1707 if (of_phy_is_fixed_link(np))
1708 of_phy_deregister_fixed_link(np);
1709 }
1710
1711 if (priv->chip_id != RCAR_GEN2) {
1712 free_irq(priv->tx_irqs[RAVB_NC], ndev);
1713 free_irq(priv->rx_irqs[RAVB_NC], ndev);
1714 free_irq(priv->tx_irqs[RAVB_BE], ndev);
1715 free_irq(priv->rx_irqs[RAVB_BE], ndev);
1716 free_irq(priv->emac_irq, ndev);
1717 }
1718 free_irq(ndev->irq, ndev);
1719
1720 napi_disable(&priv->napi[RAVB_NC]);
1721 napi_disable(&priv->napi[RAVB_BE]);
1722
1723 /* Free all the skb's in the RX queue and the DMA buffers. */
1724 ravb_ring_free(ndev, RAVB_BE);
1725 ravb_ring_free(ndev, RAVB_NC);
1726
1727 return 0;
1728}
1729
1730static int ravb_hwtstamp_get(struct net_device *ndev, struct ifreq *req)
1731{
1732 struct ravb_private *priv = netdev_priv(ndev);
1733 struct hwtstamp_config config;
1734
1735 config.flags = 0;
1736 config.tx_type = priv->tstamp_tx_ctrl ? HWTSTAMP_TX_ON :
1737 HWTSTAMP_TX_OFF;
1738 switch (priv->tstamp_rx_ctrl & RAVB_RXTSTAMP_TYPE) {
1739 case RAVB_RXTSTAMP_TYPE_V2_L2_EVENT:
1740 config.rx_filter = HWTSTAMP_FILTER_PTP_V2_L2_EVENT;
1741 break;
1742 case RAVB_RXTSTAMP_TYPE_ALL:
1743 config.rx_filter = HWTSTAMP_FILTER_ALL;
1744 break;
1745 default:
1746 config.rx_filter = HWTSTAMP_FILTER_NONE;
1747 }
1748
1749 return copy_to_user(req->ifr_data, &config, sizeof(config)) ?
1750 -EFAULT : 0;
1751}
1752
1753/* Control hardware time stamping */
1754static int ravb_hwtstamp_set(struct net_device *ndev, struct ifreq *req)
1755{
1756 struct ravb_private *priv = netdev_priv(ndev);
1757 struct hwtstamp_config config;
1758 u32 tstamp_rx_ctrl = RAVB_RXTSTAMP_ENABLED;
1759 u32 tstamp_tx_ctrl;
1760
1761 if (copy_from_user(&config, req->ifr_data, sizeof(config)))
1762 return -EFAULT;
1763
1764 /* Reserved for future extensions */
1765 if (config.flags)
1766 return -EINVAL;
1767
1768 switch (config.tx_type) {
1769 case HWTSTAMP_TX_OFF:
1770 tstamp_tx_ctrl = 0;
1771 break;
1772 case HWTSTAMP_TX_ON:
1773 tstamp_tx_ctrl = RAVB_TXTSTAMP_ENABLED;
1774 break;
1775 default:
1776 return -ERANGE;
1777 }
1778
1779 switch (config.rx_filter) {
1780 case HWTSTAMP_FILTER_NONE:
1781 tstamp_rx_ctrl = 0;
1782 break;
1783 case HWTSTAMP_FILTER_PTP_V2_L2_EVENT:
1784 tstamp_rx_ctrl |= RAVB_RXTSTAMP_TYPE_V2_L2_EVENT;
1785 break;
1786 default:
1787 config.rx_filter = HWTSTAMP_FILTER_ALL;
1788 tstamp_rx_ctrl |= RAVB_RXTSTAMP_TYPE_ALL;
1789 }
1790
1791 priv->tstamp_tx_ctrl = tstamp_tx_ctrl;
1792 priv->tstamp_rx_ctrl = tstamp_rx_ctrl;
1793
1794 return copy_to_user(req->ifr_data, &config, sizeof(config)) ?
1795 -EFAULT : 0;
1796}
1797
1798/* ioctl to device function */
1799static int ravb_do_ioctl(struct net_device *ndev, struct ifreq *req, int cmd)
1800{
1801 struct phy_device *phydev = ndev->phydev;
1802
1803 if (!netif_running(ndev))
1804 return -EINVAL;
1805
1806 if (!phydev)
1807 return -ENODEV;
1808
1809 switch (cmd) {
1810 case SIOCGHWTSTAMP:
1811 return ravb_hwtstamp_get(ndev, req);
1812 case SIOCSHWTSTAMP:
1813 return ravb_hwtstamp_set(ndev, req);
1814 }
1815
1816 return phy_mii_ioctl(phydev, req, cmd);
1817}
1818
1819static int ravb_change_mtu(struct net_device *ndev, int new_mtu)
1820{
1821 struct ravb_private *priv = netdev_priv(ndev);
1822
1823 ndev->mtu = new_mtu;
1824
1825 if (netif_running(ndev)) {
1826 synchronize_irq(priv->emac_irq);
1827 ravb_emac_init(ndev);
1828 }
1829
1830 netdev_update_features(ndev);
1831
1832 return 0;
1833}
1834
1835static void ravb_set_rx_csum(struct net_device *ndev, bool enable)
1836{
1837 struct ravb_private *priv = netdev_priv(ndev);
1838 unsigned long flags;
1839
1840 spin_lock_irqsave(&priv->lock, flags);
1841
1842 /* Disable TX and RX */
1843 ravb_rcv_snd_disable(ndev);
1844
1845 /* Modify RX Checksum setting */
1846 ravb_modify(ndev, ECMR, ECMR_RCSC, enable ? ECMR_RCSC : 0);
1847
1848 /* Enable TX and RX */
1849 ravb_rcv_snd_enable(ndev);
1850
1851 spin_unlock_irqrestore(&priv->lock, flags);
1852}
1853
1854static int ravb_set_features(struct net_device *ndev,
1855 netdev_features_t features)
1856{
1857 netdev_features_t changed = ndev->features ^ features;
1858
1859 if (changed & NETIF_F_RXCSUM)
1860 ravb_set_rx_csum(ndev, features & NETIF_F_RXCSUM);
1861
1862 ndev->features = features;
1863
1864 return 0;
1865}
1866
1867static const struct net_device_ops ravb_netdev_ops = {
1868 .ndo_open = ravb_open,
1869 .ndo_stop = ravb_close,
1870 .ndo_start_xmit = ravb_start_xmit,
1871 .ndo_select_queue = ravb_select_queue,
1872 .ndo_get_stats = ravb_get_stats,
1873 .ndo_set_rx_mode = ravb_set_rx_mode,
1874 .ndo_tx_timeout = ravb_tx_timeout,
1875 .ndo_do_ioctl = ravb_do_ioctl,
1876 .ndo_change_mtu = ravb_change_mtu,
1877 .ndo_validate_addr = eth_validate_addr,
1878 .ndo_set_mac_address = eth_mac_addr,
1879 .ndo_set_features = ravb_set_features,
1880};
1881
1882/* MDIO bus init function */
1883static int ravb_mdio_init(struct ravb_private *priv)
1884{
1885 struct platform_device *pdev = priv->pdev;
1886 struct device *dev = &pdev->dev;
1887 int error;
1888
1889 /* Bitbang init */
1890 priv->mdiobb.ops = &bb_ops;
1891
1892 /* MII controller setting */
1893 priv->mii_bus = alloc_mdio_bitbang(&priv->mdiobb);
1894 if (!priv->mii_bus)
1895 return -ENOMEM;
1896
1897 /* Hook up MII support for ethtool */
1898 priv->mii_bus->name = "ravb_mii";
1899 priv->mii_bus->parent = dev;
1900 snprintf(priv->mii_bus->id, MII_BUS_ID_SIZE, "%s-%x",
1901 pdev->name, pdev->id);
1902
1903 /* Register MDIO bus */
1904 error = of_mdiobus_register(priv->mii_bus, dev->of_node);
1905 if (error)
1906 goto out_free_bus;
1907
1908 return 0;
1909
1910out_free_bus:
1911 free_mdio_bitbang(priv->mii_bus);
1912 return error;
1913}
1914
1915/* MDIO bus release function */
1916static int ravb_mdio_release(struct ravb_private *priv)
1917{
1918 /* Unregister mdio bus */
1919 mdiobus_unregister(priv->mii_bus);
1920
1921 /* Free bitbang info */
1922 free_mdio_bitbang(priv->mii_bus);
1923
1924 return 0;
1925}
1926
1927static const struct of_device_id ravb_match_table[] = {
1928 { .compatible = "renesas,etheravb-r8a7790", .data = (void *)RCAR_GEN2 },
1929 { .compatible = "renesas,etheravb-r8a7794", .data = (void *)RCAR_GEN2 },
1930 { .compatible = "renesas,etheravb-rcar-gen2", .data = (void *)RCAR_GEN2 },
1931 { .compatible = "renesas,etheravb-r8a7795", .data = (void *)RCAR_GEN3 },
1932 { .compatible = "renesas,etheravb-rcar-gen3", .data = (void *)RCAR_GEN3 },
1933 { }
1934};
1935MODULE_DEVICE_TABLE(of, ravb_match_table);
1936
1937static int ravb_set_gti(struct net_device *ndev)
1938{
1939 struct ravb_private *priv = netdev_priv(ndev);
1940 struct device *dev = ndev->dev.parent;
1941 unsigned long rate;
1942 uint64_t inc;
1943
1944 rate = clk_get_rate(priv->clk);
1945 if (!rate)
1946 return -EINVAL;
1947
1948 inc = 1000000000ULL << 20;
1949 do_div(inc, rate);
1950
1951 if (inc < GTI_TIV_MIN || inc > GTI_TIV_MAX) {
1952 dev_err(dev, "gti.tiv increment 0x%llx is outside the range 0x%x - 0x%x\n",
1953 inc, GTI_TIV_MIN, GTI_TIV_MAX);
1954 return -EINVAL;
1955 }
1956
1957 ravb_write(ndev, inc, GTI);
1958
1959 return 0;
1960}
1961
1962static void ravb_set_config_mode(struct net_device *ndev)
1963{
1964 struct ravb_private *priv = netdev_priv(ndev);
1965
1966 if (priv->chip_id == RCAR_GEN2) {
1967 ravb_modify(ndev, CCC, CCC_OPC, CCC_OPC_CONFIG);
1968 /* Set CSEL value */
1969 ravb_modify(ndev, CCC, CCC_CSEL, CCC_CSEL_HPB);
1970 } else {
1971 ravb_modify(ndev, CCC, CCC_OPC, CCC_OPC_CONFIG |
1972 CCC_GAC | CCC_CSEL_HPB);
1973 }
1974}
1975
1976static const struct soc_device_attribute ravb_delay_mode_quirk_match[] = {
1977 { .soc_id = "r8a774c0" },
1978 { .soc_id = "r8a77990" },
1979 { .soc_id = "r8a77995" },
1980 { /* sentinel */ }
1981};
1982
1983/* Set tx and rx clock internal delay modes */
1984static void ravb_parse_delay_mode(struct device_node *np, struct net_device *ndev)
1985{
1986 struct ravb_private *priv = netdev_priv(ndev);
1987 bool explicit_delay = false;
1988 u32 delay;
1989
1990 if (!of_property_read_u32(np, "rx-internal-delay-ps", &delay)) {
1991 /* Valid values are 0 and 1800, according to DT bindings */
1992 priv->rxcidm = !!delay;
1993 explicit_delay = true;
1994 }
1995 if (!of_property_read_u32(np, "tx-internal-delay-ps", &delay)) {
1996 /* Valid values are 0 and 2000, according to DT bindings */
1997 priv->txcidm = !!delay;
1998 explicit_delay = true;
1999 }
2000
2001 if (explicit_delay)
2002 return;
2003
2004 /* Fall back to legacy rgmii-*id behavior */
2005 if (priv->phy_interface == PHY_INTERFACE_MODE_RGMII_ID ||
2006 priv->phy_interface == PHY_INTERFACE_MODE_RGMII_RXID) {
2007 priv->rxcidm = 1;
2008 priv->rgmii_override = 1;
2009 }
2010
2011 if (priv->phy_interface == PHY_INTERFACE_MODE_RGMII_ID ||
2012 priv->phy_interface == PHY_INTERFACE_MODE_RGMII_TXID) {
2013 if (!WARN(soc_device_match(ravb_delay_mode_quirk_match),
2014 "phy-mode %s requires TX clock internal delay mode which is not supported by this hardware revision. Please update device tree",
2015 phy_modes(priv->phy_interface))) {
2016 priv->txcidm = 1;
2017 priv->rgmii_override = 1;
2018 }
2019 }
2020}
2021
2022static void ravb_set_delay_mode(struct net_device *ndev)
2023{
2024 struct ravb_private *priv = netdev_priv(ndev);
2025 u32 set = 0;
2026
2027 if (priv->rxcidm)
2028 set |= APSR_RDM;
2029 if (priv->txcidm)
2030 set |= APSR_TDM;
2031 ravb_modify(ndev, APSR, APSR_RDM | APSR_TDM, set);
2032}
2033
2034static int ravb_probe(struct platform_device *pdev)
2035{
2036 struct device_node *np = pdev->dev.of_node;
2037 struct ravb_private *priv;
2038 enum ravb_chip_id chip_id;
2039 struct net_device *ndev;
2040 int error, irq, q;
2041 struct resource *res;
2042 int i;
2043
2044 if (!np) {
2045 dev_err(&pdev->dev,
2046 "this driver is required to be instantiated from device tree\n");
2047 return -EINVAL;
2048 }
2049
2050 ndev = alloc_etherdev_mqs(sizeof(struct ravb_private),
2051 NUM_TX_QUEUE, NUM_RX_QUEUE);
2052 if (!ndev)
2053 return -ENOMEM;
2054
2055 ndev->features = NETIF_F_RXCSUM;
2056 ndev->hw_features = NETIF_F_RXCSUM;
2057
2058 pm_runtime_enable(&pdev->dev);
2059 pm_runtime_get_sync(&pdev->dev);
2060
2061 chip_id = (enum ravb_chip_id)of_device_get_match_data(&pdev->dev);
2062
2063 if (chip_id == RCAR_GEN3)
2064 irq = platform_get_irq_byname(pdev, "ch22");
2065 else
2066 irq = platform_get_irq(pdev, 0);
2067 if (irq < 0) {
2068 error = irq;
2069 goto out_release;
2070 }
2071 ndev->irq = irq;
2072
2073 SET_NETDEV_DEV(ndev, &pdev->dev);
2074
2075 priv = netdev_priv(ndev);
2076 priv->ndev = ndev;
2077 priv->pdev = pdev;
2078 priv->num_tx_ring[RAVB_BE] = BE_TX_RING_SIZE;
2079 priv->num_rx_ring[RAVB_BE] = BE_RX_RING_SIZE;
2080 priv->num_tx_ring[RAVB_NC] = NC_TX_RING_SIZE;
2081 priv->num_rx_ring[RAVB_NC] = NC_RX_RING_SIZE;
2082 priv->addr = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
2083 if (IS_ERR(priv->addr)) {
2084 error = PTR_ERR(priv->addr);
2085 goto out_release;
2086 }
2087
2088 /* The Ether-specific entries in the device structure. */
2089 ndev->base_addr = res->start;
2090
2091 spin_lock_init(&priv->lock);
2092 INIT_WORK(&priv->work, ravb_tx_timeout_work);
2093
2094 error = of_get_phy_mode(np, &priv->phy_interface);
2095 if (error && error != -ENODEV)
2096 goto out_release;
2097
2098 priv->no_avb_link = of_property_read_bool(np, "renesas,no-ether-link");
2099 priv->avb_link_active_low =
2100 of_property_read_bool(np, "renesas,ether-link-active-low");
2101
2102 if (chip_id == RCAR_GEN3) {
2103 irq = platform_get_irq_byname(pdev, "ch24");
2104 if (irq < 0) {
2105 error = irq;
2106 goto out_release;
2107 }
2108 priv->emac_irq = irq;
2109 for (i = 0; i < NUM_RX_QUEUE; i++) {
2110 irq = platform_get_irq_byname(pdev, ravb_rx_irqs[i]);
2111 if (irq < 0) {
2112 error = irq;
2113 goto out_release;
2114 }
2115 priv->rx_irqs[i] = irq;
2116 }
2117 for (i = 0; i < NUM_TX_QUEUE; i++) {
2118 irq = platform_get_irq_byname(pdev, ravb_tx_irqs[i]);
2119 if (irq < 0) {
2120 error = irq;
2121 goto out_release;
2122 }
2123 priv->tx_irqs[i] = irq;
2124 }
2125 }
2126
2127 priv->chip_id = chip_id;
2128
2129 priv->clk = devm_clk_get(&pdev->dev, NULL);
2130 if (IS_ERR(priv->clk)) {
2131 error = PTR_ERR(priv->clk);
2132 goto out_release;
2133 }
2134
2135 priv->refclk = devm_clk_get_optional(&pdev->dev, "refclk");
2136 if (IS_ERR(priv->refclk)) {
2137 error = PTR_ERR(priv->refclk);
2138 goto out_release;
2139 }
2140 clk_prepare_enable(priv->refclk);
2141
2142 ndev->max_mtu = 2048 - (ETH_HLEN + VLAN_HLEN + ETH_FCS_LEN);
2143 ndev->min_mtu = ETH_MIN_MTU;
2144
2145 priv->num_tx_desc = chip_id == RCAR_GEN2 ?
2146 NUM_TX_DESC_GEN2 : NUM_TX_DESC_GEN3;
2147
2148 /* Set function */
2149 ndev->netdev_ops = &ravb_netdev_ops;
2150 ndev->ethtool_ops = &ravb_ethtool_ops;
2151
2152 /* Set AVB config mode */
2153 ravb_set_config_mode(ndev);
2154
2155 /* Set GTI value */
2156 error = ravb_set_gti(ndev);
2157 if (error)
2158 goto out_disable_refclk;
2159
2160 /* Request GTI loading */
2161 ravb_modify(ndev, GCCR, GCCR_LTI, GCCR_LTI);
2162
2163 if (priv->chip_id != RCAR_GEN2) {
2164 ravb_parse_delay_mode(np, ndev);
2165 ravb_set_delay_mode(ndev);
2166 }
2167
2168 /* Allocate descriptor base address table */
2169 priv->desc_bat_size = sizeof(struct ravb_desc) * DBAT_ENTRY_NUM;
2170 priv->desc_bat = dma_alloc_coherent(ndev->dev.parent, priv->desc_bat_size,
2171 &priv->desc_bat_dma, GFP_KERNEL);
2172 if (!priv->desc_bat) {
2173 dev_err(&pdev->dev,
2174 "Cannot allocate desc base address table (size %d bytes)\n",
2175 priv->desc_bat_size);
2176 error = -ENOMEM;
2177 goto out_disable_refclk;
2178 }
2179 for (q = RAVB_BE; q < DBAT_ENTRY_NUM; q++)
2180 priv->desc_bat[q].die_dt = DT_EOS;
2181 ravb_write(ndev, priv->desc_bat_dma, DBAT);
2182
2183 /* Initialise HW timestamp list */
2184 INIT_LIST_HEAD(&priv->ts_skb_list);
2185
2186 /* Initialise PTP Clock driver */
2187 if (chip_id != RCAR_GEN2)
2188 ravb_ptp_init(ndev, pdev);
2189
2190 /* Debug message level */
2191 priv->msg_enable = RAVB_DEF_MSG_ENABLE;
2192
2193 /* Read and set MAC address */
2194 ravb_read_mac_address(np, ndev);
2195 if (!is_valid_ether_addr(ndev->dev_addr)) {
2196 dev_warn(&pdev->dev,
2197 "no valid MAC address supplied, using a random one\n");
2198 eth_hw_addr_random(ndev);
2199 }
2200
2201 /* MDIO bus init */
2202 error = ravb_mdio_init(priv);
2203 if (error) {
2204 dev_err(&pdev->dev, "failed to initialize MDIO\n");
2205 goto out_dma_free;
2206 }
2207
2208 netif_napi_add(ndev, &priv->napi[RAVB_BE], ravb_poll, 64);
2209 netif_napi_add(ndev, &priv->napi[RAVB_NC], ravb_poll, 64);
2210
2211 /* Network device register */
2212 error = register_netdev(ndev);
2213 if (error)
2214 goto out_napi_del;
2215
2216 device_set_wakeup_capable(&pdev->dev, 1);
2217
2218 /* Print device information */
2219 netdev_info(ndev, "Base address at %#x, %pM, IRQ %d.\n",
2220 (u32)ndev->base_addr, ndev->dev_addr, ndev->irq);
2221
2222 platform_set_drvdata(pdev, ndev);
2223
2224 return 0;
2225
2226out_napi_del:
2227 netif_napi_del(&priv->napi[RAVB_NC]);
2228 netif_napi_del(&priv->napi[RAVB_BE]);
2229 ravb_mdio_release(priv);
2230out_dma_free:
2231 dma_free_coherent(ndev->dev.parent, priv->desc_bat_size, priv->desc_bat,
2232 priv->desc_bat_dma);
2233
2234 /* Stop PTP Clock driver */
2235 if (chip_id != RCAR_GEN2)
2236 ravb_ptp_stop(ndev);
2237out_disable_refclk:
2238 clk_disable_unprepare(priv->refclk);
2239out_release:
2240 free_netdev(ndev);
2241
2242 pm_runtime_put(&pdev->dev);
2243 pm_runtime_disable(&pdev->dev);
2244 return error;
2245}
2246
2247static int ravb_remove(struct platform_device *pdev)
2248{
2249 struct net_device *ndev = platform_get_drvdata(pdev);
2250 struct ravb_private *priv = netdev_priv(ndev);
2251
2252 /* Stop PTP Clock driver */
2253 if (priv->chip_id != RCAR_GEN2)
2254 ravb_ptp_stop(ndev);
2255
2256 clk_disable_unprepare(priv->refclk);
2257
2258 dma_free_coherent(ndev->dev.parent, priv->desc_bat_size, priv->desc_bat,
2259 priv->desc_bat_dma);
2260 /* Set reset mode */
2261 ravb_write(ndev, CCC_OPC_RESET, CCC);
2262 pm_runtime_put_sync(&pdev->dev);
2263 unregister_netdev(ndev);
2264 netif_napi_del(&priv->napi[RAVB_NC]);
2265 netif_napi_del(&priv->napi[RAVB_BE]);
2266 ravb_mdio_release(priv);
2267 pm_runtime_disable(&pdev->dev);
2268 free_netdev(ndev);
2269 platform_set_drvdata(pdev, NULL);
2270
2271 return 0;
2272}
2273
2274static int ravb_wol_setup(struct net_device *ndev)
2275{
2276 struct ravb_private *priv = netdev_priv(ndev);
2277
2278 /* Disable interrupts by clearing the interrupt masks. */
2279 ravb_write(ndev, 0, RIC0);
2280 ravb_write(ndev, 0, RIC2);
2281 ravb_write(ndev, 0, TIC);
2282
2283 /* Only allow ECI interrupts */
2284 synchronize_irq(priv->emac_irq);
2285 napi_disable(&priv->napi[RAVB_NC]);
2286 napi_disable(&priv->napi[RAVB_BE]);
2287 ravb_write(ndev, ECSIPR_MPDIP, ECSIPR);
2288
2289 /* Enable MagicPacket */
2290 ravb_modify(ndev, ECMR, ECMR_MPDE, ECMR_MPDE);
2291
2292 return enable_irq_wake(priv->emac_irq);
2293}
2294
2295static int ravb_wol_restore(struct net_device *ndev)
2296{
2297 struct ravb_private *priv = netdev_priv(ndev);
2298 int ret;
2299
2300 napi_enable(&priv->napi[RAVB_NC]);
2301 napi_enable(&priv->napi[RAVB_BE]);
2302
2303 /* Disable MagicPacket */
2304 ravb_modify(ndev, ECMR, ECMR_MPDE, 0);
2305
2306 ret = ravb_close(ndev);
2307 if (ret < 0)
2308 return ret;
2309
2310 return disable_irq_wake(priv->emac_irq);
2311}
2312
2313static int __maybe_unused ravb_suspend(struct device *dev)
2314{
2315 struct net_device *ndev = dev_get_drvdata(dev);
2316 struct ravb_private *priv = netdev_priv(ndev);
2317 int ret;
2318
2319 if (!netif_running(ndev))
2320 return 0;
2321
2322 netif_device_detach(ndev);
2323
2324 if (priv->wol_enabled)
2325 ret = ravb_wol_setup(ndev);
2326 else
2327 ret = ravb_close(ndev);
2328
2329 return ret;
2330}
2331
2332static int __maybe_unused ravb_resume(struct device *dev)
2333{
2334 struct net_device *ndev = dev_get_drvdata(dev);
2335 struct ravb_private *priv = netdev_priv(ndev);
2336 int ret = 0;
2337
2338 /* If WoL is enabled set reset mode to rearm the WoL logic */
2339 if (priv->wol_enabled)
2340 ravb_write(ndev, CCC_OPC_RESET, CCC);
2341
2342 /* All register have been reset to default values.
2343 * Restore all registers which where setup at probe time and
2344 * reopen device if it was running before system suspended.
2345 */
2346
2347 /* Set AVB config mode */
2348 ravb_set_config_mode(ndev);
2349
2350 /* Set GTI value */
2351 ret = ravb_set_gti(ndev);
2352 if (ret)
2353 return ret;
2354
2355 /* Request GTI loading */
2356 ravb_modify(ndev, GCCR, GCCR_LTI, GCCR_LTI);
2357
2358 if (priv->chip_id != RCAR_GEN2)
2359 ravb_set_delay_mode(ndev);
2360
2361 /* Restore descriptor base address table */
2362 ravb_write(ndev, priv->desc_bat_dma, DBAT);
2363
2364 if (netif_running(ndev)) {
2365 if (priv->wol_enabled) {
2366 ret = ravb_wol_restore(ndev);
2367 if (ret)
2368 return ret;
2369 }
2370 ret = ravb_open(ndev);
2371 if (ret < 0)
2372 return ret;
2373 netif_device_attach(ndev);
2374 }
2375
2376 return ret;
2377}
2378
2379static int __maybe_unused ravb_runtime_nop(struct device *dev)
2380{
2381 /* Runtime PM callback shared between ->runtime_suspend()
2382 * and ->runtime_resume(). Simply returns success.
2383 *
2384 * This driver re-initializes all registers after
2385 * pm_runtime_get_sync() anyway so there is no need
2386 * to save and restore registers here.
2387 */
2388 return 0;
2389}
2390
2391static const struct dev_pm_ops ravb_dev_pm_ops = {
2392 SET_SYSTEM_SLEEP_PM_OPS(ravb_suspend, ravb_resume)
2393 SET_RUNTIME_PM_OPS(ravb_runtime_nop, ravb_runtime_nop, NULL)
2394};
2395
2396static struct platform_driver ravb_driver = {
2397 .probe = ravb_probe,
2398 .remove = ravb_remove,
2399 .driver = {
2400 .name = "ravb",
2401 .pm = &ravb_dev_pm_ops,
2402 .of_match_table = ravb_match_table,
2403 },
2404};
2405
2406module_platform_driver(ravb_driver);
2407
2408MODULE_AUTHOR("Mitsuhiro Kimura, Masaru Nagai");
2409MODULE_DESCRIPTION("Renesas Ethernet AVB driver");
2410MODULE_LICENSE("GPL v2");