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Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
[mirror_ubuntu-artful-kernel.git] / drivers / net / ethernet / renesas / ravb_main.c
1 /* Renesas Ethernet AVB device driver
2 *
3 * Copyright (C) 2014-2015 Renesas Electronics Corporation
4 * Copyright (C) 2015 Renesas Solutions Corp.
5 * Copyright (C) 2015 Cogent Embedded, Inc. <source@cogentembedded.com>
6 *
7 * Based on the SuperH Ethernet driver
8 *
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms and conditions of the GNU General Public License version 2,
11 * as published by the Free Software Foundation.
12 */
13
14 #include <linux/cache.h>
15 #include <linux/clk.h>
16 #include <linux/delay.h>
17 #include <linux/dma-mapping.h>
18 #include <linux/err.h>
19 #include <linux/etherdevice.h>
20 #include <linux/ethtool.h>
21 #include <linux/if_vlan.h>
22 #include <linux/kernel.h>
23 #include <linux/list.h>
24 #include <linux/module.h>
25 #include <linux/net_tstamp.h>
26 #include <linux/of.h>
27 #include <linux/of_device.h>
28 #include <linux/of_irq.h>
29 #include <linux/of_mdio.h>
30 #include <linux/of_net.h>
31 #include <linux/pm_runtime.h>
32 #include <linux/slab.h>
33 #include <linux/spinlock.h>
34
35 #include <asm/div64.h>
36
37 #include "ravb.h"
38
39 #define RAVB_DEF_MSG_ENABLE \
40 (NETIF_MSG_LINK | \
41 NETIF_MSG_TIMER | \
42 NETIF_MSG_RX_ERR | \
43 NETIF_MSG_TX_ERR)
44
45 int ravb_wait(struct net_device *ndev, enum ravb_reg reg, u32 mask, u32 value)
46 {
47 int i;
48
49 for (i = 0; i < 10000; i++) {
50 if ((ravb_read(ndev, reg) & mask) == value)
51 return 0;
52 udelay(10);
53 }
54 return -ETIMEDOUT;
55 }
56
57 static int ravb_config(struct net_device *ndev)
58 {
59 int error;
60
61 /* Set config mode */
62 ravb_write(ndev, (ravb_read(ndev, CCC) & ~CCC_OPC) | CCC_OPC_CONFIG,
63 CCC);
64 /* Check if the operating mode is changed to the config mode */
65 error = ravb_wait(ndev, CSR, CSR_OPS, CSR_OPS_CONFIG);
66 if (error)
67 netdev_err(ndev, "failed to switch device to config mode\n");
68
69 return error;
70 }
71
72 static void ravb_set_duplex(struct net_device *ndev)
73 {
74 struct ravb_private *priv = netdev_priv(ndev);
75 u32 ecmr = ravb_read(ndev, ECMR);
76
77 if (priv->duplex) /* Full */
78 ecmr |= ECMR_DM;
79 else /* Half */
80 ecmr &= ~ECMR_DM;
81 ravb_write(ndev, ecmr, ECMR);
82 }
83
84 static void ravb_set_rate(struct net_device *ndev)
85 {
86 struct ravb_private *priv = netdev_priv(ndev);
87
88 switch (priv->speed) {
89 case 100: /* 100BASE */
90 ravb_write(ndev, GECMR_SPEED_100, GECMR);
91 break;
92 case 1000: /* 1000BASE */
93 ravb_write(ndev, GECMR_SPEED_1000, GECMR);
94 break;
95 default:
96 break;
97 }
98 }
99
100 static void ravb_set_buffer_align(struct sk_buff *skb)
101 {
102 u32 reserve = (unsigned long)skb->data & (RAVB_ALIGN - 1);
103
104 if (reserve)
105 skb_reserve(skb, RAVB_ALIGN - reserve);
106 }
107
108 /* Get MAC address from the MAC address registers
109 *
110 * Ethernet AVB device doesn't have ROM for MAC address.
111 * This function gets the MAC address that was used by a bootloader.
112 */
113 static void ravb_read_mac_address(struct net_device *ndev, const u8 *mac)
114 {
115 if (mac) {
116 ether_addr_copy(ndev->dev_addr, mac);
117 } else {
118 u32 mahr = ravb_read(ndev, MAHR);
119 u32 malr = ravb_read(ndev, MALR);
120
121 ndev->dev_addr[0] = (mahr >> 24) & 0xFF;
122 ndev->dev_addr[1] = (mahr >> 16) & 0xFF;
123 ndev->dev_addr[2] = (mahr >> 8) & 0xFF;
124 ndev->dev_addr[3] = (mahr >> 0) & 0xFF;
125 ndev->dev_addr[4] = (malr >> 8) & 0xFF;
126 ndev->dev_addr[5] = (malr >> 0) & 0xFF;
127 }
128 }
129
130 static void ravb_mdio_ctrl(struct mdiobb_ctrl *ctrl, u32 mask, int set)
131 {
132 struct ravb_private *priv = container_of(ctrl, struct ravb_private,
133 mdiobb);
134 u32 pir = ravb_read(priv->ndev, PIR);
135
136 if (set)
137 pir |= mask;
138 else
139 pir &= ~mask;
140 ravb_write(priv->ndev, pir, PIR);
141 }
142
143 /* MDC pin control */
144 static void ravb_set_mdc(struct mdiobb_ctrl *ctrl, int level)
145 {
146 ravb_mdio_ctrl(ctrl, PIR_MDC, level);
147 }
148
149 /* Data I/O pin control */
150 static void ravb_set_mdio_dir(struct mdiobb_ctrl *ctrl, int output)
151 {
152 ravb_mdio_ctrl(ctrl, PIR_MMD, output);
153 }
154
155 /* Set data bit */
156 static void ravb_set_mdio_data(struct mdiobb_ctrl *ctrl, int value)
157 {
158 ravb_mdio_ctrl(ctrl, PIR_MDO, value);
159 }
160
161 /* Get data bit */
162 static int ravb_get_mdio_data(struct mdiobb_ctrl *ctrl)
163 {
164 struct ravb_private *priv = container_of(ctrl, struct ravb_private,
165 mdiobb);
166
167 return (ravb_read(priv->ndev, PIR) & PIR_MDI) != 0;
168 }
169
170 /* MDIO bus control struct */
171 static struct mdiobb_ops bb_ops = {
172 .owner = THIS_MODULE,
173 .set_mdc = ravb_set_mdc,
174 .set_mdio_dir = ravb_set_mdio_dir,
175 .set_mdio_data = ravb_set_mdio_data,
176 .get_mdio_data = ravb_get_mdio_data,
177 };
178
179 /* Free skb's and DMA buffers for Ethernet AVB */
180 static void ravb_ring_free(struct net_device *ndev, int q)
181 {
182 struct ravb_private *priv = netdev_priv(ndev);
183 int ring_size;
184 int i;
185
186 /* Free RX skb ringbuffer */
187 if (priv->rx_skb[q]) {
188 for (i = 0; i < priv->num_rx_ring[q]; i++)
189 dev_kfree_skb(priv->rx_skb[q][i]);
190 }
191 kfree(priv->rx_skb[q]);
192 priv->rx_skb[q] = NULL;
193
194 /* Free TX skb ringbuffer */
195 if (priv->tx_skb[q]) {
196 for (i = 0; i < priv->num_tx_ring[q]; i++)
197 dev_kfree_skb(priv->tx_skb[q][i]);
198 }
199 kfree(priv->tx_skb[q]);
200 priv->tx_skb[q] = NULL;
201
202 /* Free aligned TX buffers */
203 kfree(priv->tx_align[q]);
204 priv->tx_align[q] = NULL;
205
206 if (priv->rx_ring[q]) {
207 ring_size = sizeof(struct ravb_ex_rx_desc) *
208 (priv->num_rx_ring[q] + 1);
209 dma_free_coherent(ndev->dev.parent, ring_size, priv->rx_ring[q],
210 priv->rx_desc_dma[q]);
211 priv->rx_ring[q] = NULL;
212 }
213
214 if (priv->tx_ring[q]) {
215 ring_size = sizeof(struct ravb_tx_desc) *
216 (priv->num_tx_ring[q] * NUM_TX_DESC + 1);
217 dma_free_coherent(ndev->dev.parent, ring_size, priv->tx_ring[q],
218 priv->tx_desc_dma[q]);
219 priv->tx_ring[q] = NULL;
220 }
221 }
222
223 /* Format skb and descriptor buffer for Ethernet AVB */
224 static void ravb_ring_format(struct net_device *ndev, int q)
225 {
226 struct ravb_private *priv = netdev_priv(ndev);
227 struct ravb_ex_rx_desc *rx_desc;
228 struct ravb_tx_desc *tx_desc;
229 struct ravb_desc *desc;
230 int rx_ring_size = sizeof(*rx_desc) * priv->num_rx_ring[q];
231 int tx_ring_size = sizeof(*tx_desc) * priv->num_tx_ring[q] *
232 NUM_TX_DESC;
233 dma_addr_t dma_addr;
234 int i;
235
236 priv->cur_rx[q] = 0;
237 priv->cur_tx[q] = 0;
238 priv->dirty_rx[q] = 0;
239 priv->dirty_tx[q] = 0;
240
241 memset(priv->rx_ring[q], 0, rx_ring_size);
242 /* Build RX ring buffer */
243 for (i = 0; i < priv->num_rx_ring[q]; i++) {
244 /* RX descriptor */
245 rx_desc = &priv->rx_ring[q][i];
246 /* The size of the buffer should be on 16-byte boundary. */
247 rx_desc->ds_cc = cpu_to_le16(ALIGN(PKT_BUF_SZ, 16));
248 dma_addr = dma_map_single(ndev->dev.parent, priv->rx_skb[q][i]->data,
249 ALIGN(PKT_BUF_SZ, 16),
250 DMA_FROM_DEVICE);
251 /* We just set the data size to 0 for a failed mapping which
252 * should prevent DMA from happening...
253 */
254 if (dma_mapping_error(ndev->dev.parent, dma_addr))
255 rx_desc->ds_cc = cpu_to_le16(0);
256 rx_desc->dptr = cpu_to_le32(dma_addr);
257 rx_desc->die_dt = DT_FEMPTY;
258 }
259 rx_desc = &priv->rx_ring[q][i];
260 rx_desc->dptr = cpu_to_le32((u32)priv->rx_desc_dma[q]);
261 rx_desc->die_dt = DT_LINKFIX; /* type */
262
263 memset(priv->tx_ring[q], 0, tx_ring_size);
264 /* Build TX ring buffer */
265 for (i = 0, tx_desc = priv->tx_ring[q]; i < priv->num_tx_ring[q];
266 i++, tx_desc++) {
267 tx_desc->die_dt = DT_EEMPTY;
268 tx_desc++;
269 tx_desc->die_dt = DT_EEMPTY;
270 }
271 tx_desc->dptr = cpu_to_le32((u32)priv->tx_desc_dma[q]);
272 tx_desc->die_dt = DT_LINKFIX; /* type */
273
274 /* RX descriptor base address for best effort */
275 desc = &priv->desc_bat[RX_QUEUE_OFFSET + q];
276 desc->die_dt = DT_LINKFIX; /* type */
277 desc->dptr = cpu_to_le32((u32)priv->rx_desc_dma[q]);
278
279 /* TX descriptor base address for best effort */
280 desc = &priv->desc_bat[q];
281 desc->die_dt = DT_LINKFIX; /* type */
282 desc->dptr = cpu_to_le32((u32)priv->tx_desc_dma[q]);
283 }
284
285 /* Init skb and descriptor buffer for Ethernet AVB */
286 static int ravb_ring_init(struct net_device *ndev, int q)
287 {
288 struct ravb_private *priv = netdev_priv(ndev);
289 struct sk_buff *skb;
290 int ring_size;
291 int i;
292
293 /* Allocate RX and TX skb rings */
294 priv->rx_skb[q] = kcalloc(priv->num_rx_ring[q],
295 sizeof(*priv->rx_skb[q]), GFP_KERNEL);
296 priv->tx_skb[q] = kcalloc(priv->num_tx_ring[q],
297 sizeof(*priv->tx_skb[q]), GFP_KERNEL);
298 if (!priv->rx_skb[q] || !priv->tx_skb[q])
299 goto error;
300
301 for (i = 0; i < priv->num_rx_ring[q]; i++) {
302 skb = netdev_alloc_skb(ndev, PKT_BUF_SZ + RAVB_ALIGN - 1);
303 if (!skb)
304 goto error;
305 ravb_set_buffer_align(skb);
306 priv->rx_skb[q][i] = skb;
307 }
308
309 /* Allocate rings for the aligned buffers */
310 priv->tx_align[q] = kmalloc(DPTR_ALIGN * priv->num_tx_ring[q] +
311 DPTR_ALIGN - 1, GFP_KERNEL);
312 if (!priv->tx_align[q])
313 goto error;
314
315 /* Allocate all RX descriptors. */
316 ring_size = sizeof(struct ravb_ex_rx_desc) * (priv->num_rx_ring[q] + 1);
317 priv->rx_ring[q] = dma_alloc_coherent(ndev->dev.parent, ring_size,
318 &priv->rx_desc_dma[q],
319 GFP_KERNEL);
320 if (!priv->rx_ring[q])
321 goto error;
322
323 priv->dirty_rx[q] = 0;
324
325 /* Allocate all TX descriptors. */
326 ring_size = sizeof(struct ravb_tx_desc) *
327 (priv->num_tx_ring[q] * NUM_TX_DESC + 1);
328 priv->tx_ring[q] = dma_alloc_coherent(ndev->dev.parent, ring_size,
329 &priv->tx_desc_dma[q],
330 GFP_KERNEL);
331 if (!priv->tx_ring[q])
332 goto error;
333
334 return 0;
335
336 error:
337 ravb_ring_free(ndev, q);
338
339 return -ENOMEM;
340 }
341
342 /* E-MAC init function */
343 static void ravb_emac_init(struct net_device *ndev)
344 {
345 struct ravb_private *priv = netdev_priv(ndev);
346
347 /* Receive frame limit set register */
348 ravb_write(ndev, ndev->mtu + ETH_HLEN + VLAN_HLEN + ETH_FCS_LEN, RFLR);
349
350 /* PAUSE prohibition */
351 ravb_write(ndev, ECMR_ZPF | (priv->duplex ? ECMR_DM : 0) |
352 ECMR_TE | ECMR_RE, ECMR);
353
354 ravb_set_rate(ndev);
355
356 /* Set MAC address */
357 ravb_write(ndev,
358 (ndev->dev_addr[0] << 24) | (ndev->dev_addr[1] << 16) |
359 (ndev->dev_addr[2] << 8) | (ndev->dev_addr[3]), MAHR);
360 ravb_write(ndev,
361 (ndev->dev_addr[4] << 8) | (ndev->dev_addr[5]), MALR);
362
363 ravb_write(ndev, 1, MPR);
364
365 /* E-MAC status register clear */
366 ravb_write(ndev, ECSR_ICD | ECSR_MPD, ECSR);
367
368 /* E-MAC interrupt enable register */
369 ravb_write(ndev, ECSIPR_ICDIP | ECSIPR_MPDIP | ECSIPR_LCHNGIP, ECSIPR);
370 }
371
372 /* Device init function for Ethernet AVB */
373 static int ravb_dmac_init(struct net_device *ndev)
374 {
375 int error;
376
377 /* Set CONFIG mode */
378 error = ravb_config(ndev);
379 if (error)
380 return error;
381
382 error = ravb_ring_init(ndev, RAVB_BE);
383 if (error)
384 return error;
385 error = ravb_ring_init(ndev, RAVB_NC);
386 if (error) {
387 ravb_ring_free(ndev, RAVB_BE);
388 return error;
389 }
390
391 /* Descriptor format */
392 ravb_ring_format(ndev, RAVB_BE);
393 ravb_ring_format(ndev, RAVB_NC);
394
395 #if defined(__LITTLE_ENDIAN)
396 ravb_write(ndev, ravb_read(ndev, CCC) & ~CCC_BOC, CCC);
397 #else
398 ravb_write(ndev, ravb_read(ndev, CCC) | CCC_BOC, CCC);
399 #endif
400
401 /* Set AVB RX */
402 ravb_write(ndev, RCR_EFFS | RCR_ENCF | RCR_ETS0 | 0x18000000, RCR);
403
404 /* Set FIFO size */
405 ravb_write(ndev, TGC_TQP_AVBMODE1 | 0x00222200, TGC);
406
407 /* Timestamp enable */
408 ravb_write(ndev, TCCR_TFEN, TCCR);
409
410 /* Interrupt init: */
411 /* Frame receive */
412 ravb_write(ndev, RIC0_FRE0 | RIC0_FRE1, RIC0);
413 /* Disable FIFO full warning */
414 ravb_write(ndev, 0, RIC1);
415 /* Receive FIFO full error, descriptor empty */
416 ravb_write(ndev, RIC2_QFE0 | RIC2_QFE1 | RIC2_RFFE, RIC2);
417 /* Frame transmitted, timestamp FIFO updated */
418 ravb_write(ndev, TIC_FTE0 | TIC_FTE1 | TIC_TFUE, TIC);
419
420 /* Setting the control will start the AVB-DMAC process. */
421 ravb_write(ndev, (ravb_read(ndev, CCC) & ~CCC_OPC) | CCC_OPC_OPERATION,
422 CCC);
423
424 return 0;
425 }
426
427 /* Free TX skb function for AVB-IP */
428 static int ravb_tx_free(struct net_device *ndev, int q)
429 {
430 struct ravb_private *priv = netdev_priv(ndev);
431 struct net_device_stats *stats = &priv->stats[q];
432 struct ravb_tx_desc *desc;
433 int free_num = 0;
434 int entry;
435 u32 size;
436
437 for (; priv->cur_tx[q] - priv->dirty_tx[q] > 0; priv->dirty_tx[q]++) {
438 entry = priv->dirty_tx[q] % (priv->num_tx_ring[q] *
439 NUM_TX_DESC);
440 desc = &priv->tx_ring[q][entry];
441 if (desc->die_dt != DT_FEMPTY)
442 break;
443 /* Descriptor type must be checked before all other reads */
444 dma_rmb();
445 size = le16_to_cpu(desc->ds_tagl) & TX_DS;
446 /* Free the original skb. */
447 if (priv->tx_skb[q][entry / NUM_TX_DESC]) {
448 dma_unmap_single(ndev->dev.parent, le32_to_cpu(desc->dptr),
449 size, DMA_TO_DEVICE);
450 /* Last packet descriptor? */
451 if (entry % NUM_TX_DESC == NUM_TX_DESC - 1) {
452 entry /= NUM_TX_DESC;
453 dev_kfree_skb_any(priv->tx_skb[q][entry]);
454 priv->tx_skb[q][entry] = NULL;
455 stats->tx_packets++;
456 }
457 free_num++;
458 }
459 stats->tx_bytes += size;
460 desc->die_dt = DT_EEMPTY;
461 }
462 return free_num;
463 }
464
465 static void ravb_get_tx_tstamp(struct net_device *ndev)
466 {
467 struct ravb_private *priv = netdev_priv(ndev);
468 struct ravb_tstamp_skb *ts_skb, *ts_skb2;
469 struct skb_shared_hwtstamps shhwtstamps;
470 struct sk_buff *skb;
471 struct timespec64 ts;
472 u16 tag, tfa_tag;
473 int count;
474 u32 tfa2;
475
476 count = (ravb_read(ndev, TSR) & TSR_TFFL) >> 8;
477 while (count--) {
478 tfa2 = ravb_read(ndev, TFA2);
479 tfa_tag = (tfa2 & TFA2_TST) >> 16;
480 ts.tv_nsec = (u64)ravb_read(ndev, TFA0);
481 ts.tv_sec = ((u64)(tfa2 & TFA2_TSV) << 32) |
482 ravb_read(ndev, TFA1);
483 memset(&shhwtstamps, 0, sizeof(shhwtstamps));
484 shhwtstamps.hwtstamp = timespec64_to_ktime(ts);
485 list_for_each_entry_safe(ts_skb, ts_skb2, &priv->ts_skb_list,
486 list) {
487 skb = ts_skb->skb;
488 tag = ts_skb->tag;
489 list_del(&ts_skb->list);
490 kfree(ts_skb);
491 if (tag == tfa_tag) {
492 skb_tstamp_tx(skb, &shhwtstamps);
493 break;
494 }
495 }
496 ravb_write(ndev, ravb_read(ndev, TCCR) | TCCR_TFR, TCCR);
497 }
498 }
499
500 /* Packet receive function for Ethernet AVB */
501 static bool ravb_rx(struct net_device *ndev, int *quota, int q)
502 {
503 struct ravb_private *priv = netdev_priv(ndev);
504 int entry = priv->cur_rx[q] % priv->num_rx_ring[q];
505 int boguscnt = (priv->dirty_rx[q] + priv->num_rx_ring[q]) -
506 priv->cur_rx[q];
507 struct net_device_stats *stats = &priv->stats[q];
508 struct ravb_ex_rx_desc *desc;
509 struct sk_buff *skb;
510 dma_addr_t dma_addr;
511 struct timespec64 ts;
512 u8 desc_status;
513 u16 pkt_len;
514 int limit;
515
516 boguscnt = min(boguscnt, *quota);
517 limit = boguscnt;
518 desc = &priv->rx_ring[q][entry];
519 while (desc->die_dt != DT_FEMPTY) {
520 /* Descriptor type must be checked before all other reads */
521 dma_rmb();
522 desc_status = desc->msc;
523 pkt_len = le16_to_cpu(desc->ds_cc) & RX_DS;
524
525 if (--boguscnt < 0)
526 break;
527
528 /* We use 0-byte descriptors to mark the DMA mapping errors */
529 if (!pkt_len)
530 continue;
531
532 if (desc_status & MSC_MC)
533 stats->multicast++;
534
535 if (desc_status & (MSC_CRC | MSC_RFE | MSC_RTSF | MSC_RTLF |
536 MSC_CEEF)) {
537 stats->rx_errors++;
538 if (desc_status & MSC_CRC)
539 stats->rx_crc_errors++;
540 if (desc_status & MSC_RFE)
541 stats->rx_frame_errors++;
542 if (desc_status & (MSC_RTLF | MSC_RTSF))
543 stats->rx_length_errors++;
544 if (desc_status & MSC_CEEF)
545 stats->rx_missed_errors++;
546 } else {
547 u32 get_ts = priv->tstamp_rx_ctrl & RAVB_RXTSTAMP_TYPE;
548
549 skb = priv->rx_skb[q][entry];
550 priv->rx_skb[q][entry] = NULL;
551 dma_unmap_single(ndev->dev.parent, le32_to_cpu(desc->dptr),
552 ALIGN(PKT_BUF_SZ, 16),
553 DMA_FROM_DEVICE);
554 get_ts &= (q == RAVB_NC) ?
555 RAVB_RXTSTAMP_TYPE_V2_L2_EVENT :
556 ~RAVB_RXTSTAMP_TYPE_V2_L2_EVENT;
557 if (get_ts) {
558 struct skb_shared_hwtstamps *shhwtstamps;
559
560 shhwtstamps = skb_hwtstamps(skb);
561 memset(shhwtstamps, 0, sizeof(*shhwtstamps));
562 ts.tv_sec = ((u64) le16_to_cpu(desc->ts_sh) <<
563 32) | le32_to_cpu(desc->ts_sl);
564 ts.tv_nsec = le32_to_cpu(desc->ts_n);
565 shhwtstamps->hwtstamp = timespec64_to_ktime(ts);
566 }
567 skb_put(skb, pkt_len);
568 skb->protocol = eth_type_trans(skb, ndev);
569 napi_gro_receive(&priv->napi[q], skb);
570 stats->rx_packets++;
571 stats->rx_bytes += pkt_len;
572 }
573
574 entry = (++priv->cur_rx[q]) % priv->num_rx_ring[q];
575 desc = &priv->rx_ring[q][entry];
576 }
577
578 /* Refill the RX ring buffers. */
579 for (; priv->cur_rx[q] - priv->dirty_rx[q] > 0; priv->dirty_rx[q]++) {
580 entry = priv->dirty_rx[q] % priv->num_rx_ring[q];
581 desc = &priv->rx_ring[q][entry];
582 /* The size of the buffer should be on 16-byte boundary. */
583 desc->ds_cc = cpu_to_le16(ALIGN(PKT_BUF_SZ, 16));
584
585 if (!priv->rx_skb[q][entry]) {
586 skb = netdev_alloc_skb(ndev,
587 PKT_BUF_SZ + RAVB_ALIGN - 1);
588 if (!skb)
589 break; /* Better luck next round. */
590 ravb_set_buffer_align(skb);
591 dma_addr = dma_map_single(ndev->dev.parent, skb->data,
592 le16_to_cpu(desc->ds_cc),
593 DMA_FROM_DEVICE);
594 skb_checksum_none_assert(skb);
595 /* We just set the data size to 0 for a failed mapping
596 * which should prevent DMA from happening...
597 */
598 if (dma_mapping_error(ndev->dev.parent, dma_addr))
599 desc->ds_cc = cpu_to_le16(0);
600 desc->dptr = cpu_to_le32(dma_addr);
601 priv->rx_skb[q][entry] = skb;
602 }
603 /* Descriptor type must be set after all the above writes */
604 dma_wmb();
605 desc->die_dt = DT_FEMPTY;
606 }
607
608 *quota -= limit - (++boguscnt);
609
610 return boguscnt <= 0;
611 }
612
613 static void ravb_rcv_snd_disable(struct net_device *ndev)
614 {
615 /* Disable TX and RX */
616 ravb_write(ndev, ravb_read(ndev, ECMR) & ~(ECMR_RE | ECMR_TE), ECMR);
617 }
618
619 static void ravb_rcv_snd_enable(struct net_device *ndev)
620 {
621 /* Enable TX and RX */
622 ravb_write(ndev, ravb_read(ndev, ECMR) | ECMR_RE | ECMR_TE, ECMR);
623 }
624
625 /* function for waiting dma process finished */
626 static int ravb_stop_dma(struct net_device *ndev)
627 {
628 int error;
629
630 /* Wait for stopping the hardware TX process */
631 error = ravb_wait(ndev, TCCR,
632 TCCR_TSRQ0 | TCCR_TSRQ1 | TCCR_TSRQ2 | TCCR_TSRQ3, 0);
633 if (error)
634 return error;
635
636 error = ravb_wait(ndev, CSR, CSR_TPO0 | CSR_TPO1 | CSR_TPO2 | CSR_TPO3,
637 0);
638 if (error)
639 return error;
640
641 /* Stop the E-MAC's RX/TX processes. */
642 ravb_rcv_snd_disable(ndev);
643
644 /* Wait for stopping the RX DMA process */
645 error = ravb_wait(ndev, CSR, CSR_RPO, 0);
646 if (error)
647 return error;
648
649 /* Stop AVB-DMAC process */
650 return ravb_config(ndev);
651 }
652
653 /* E-MAC interrupt handler */
654 static void ravb_emac_interrupt(struct net_device *ndev)
655 {
656 struct ravb_private *priv = netdev_priv(ndev);
657 u32 ecsr, psr;
658
659 ecsr = ravb_read(ndev, ECSR);
660 ravb_write(ndev, ecsr, ECSR); /* clear interrupt */
661 if (ecsr & ECSR_ICD)
662 ndev->stats.tx_carrier_errors++;
663 if (ecsr & ECSR_LCHNG) {
664 /* Link changed */
665 if (priv->no_avb_link)
666 return;
667 psr = ravb_read(ndev, PSR);
668 if (priv->avb_link_active_low)
669 psr ^= PSR_LMON;
670 if (!(psr & PSR_LMON)) {
671 /* DIsable RX and TX */
672 ravb_rcv_snd_disable(ndev);
673 } else {
674 /* Enable RX and TX */
675 ravb_rcv_snd_enable(ndev);
676 }
677 }
678 }
679
680 /* Error interrupt handler */
681 static void ravb_error_interrupt(struct net_device *ndev)
682 {
683 struct ravb_private *priv = netdev_priv(ndev);
684 u32 eis, ris2;
685
686 eis = ravb_read(ndev, EIS);
687 ravb_write(ndev, ~EIS_QFS, EIS);
688 if (eis & EIS_QFS) {
689 ris2 = ravb_read(ndev, RIS2);
690 ravb_write(ndev, ~(RIS2_QFF0 | RIS2_RFFF), RIS2);
691
692 /* Receive Descriptor Empty int */
693 if (ris2 & RIS2_QFF0)
694 priv->stats[RAVB_BE].rx_over_errors++;
695
696 /* Receive Descriptor Empty int */
697 if (ris2 & RIS2_QFF1)
698 priv->stats[RAVB_NC].rx_over_errors++;
699
700 /* Receive FIFO Overflow int */
701 if (ris2 & RIS2_RFFF)
702 priv->rx_fifo_errors++;
703 }
704 }
705
706 static irqreturn_t ravb_interrupt(int irq, void *dev_id)
707 {
708 struct net_device *ndev = dev_id;
709 struct ravb_private *priv = netdev_priv(ndev);
710 irqreturn_t result = IRQ_NONE;
711 u32 iss;
712
713 spin_lock(&priv->lock);
714 /* Get interrupt status */
715 iss = ravb_read(ndev, ISS);
716
717 /* Received and transmitted interrupts */
718 if (iss & (ISS_FRS | ISS_FTS | ISS_TFUS)) {
719 u32 ris0 = ravb_read(ndev, RIS0);
720 u32 ric0 = ravb_read(ndev, RIC0);
721 u32 tis = ravb_read(ndev, TIS);
722 u32 tic = ravb_read(ndev, TIC);
723 int q;
724
725 /* Timestamp updated */
726 if (tis & TIS_TFUF) {
727 ravb_write(ndev, ~TIS_TFUF, TIS);
728 ravb_get_tx_tstamp(ndev);
729 result = IRQ_HANDLED;
730 }
731
732 /* Network control and best effort queue RX/TX */
733 for (q = RAVB_NC; q >= RAVB_BE; q--) {
734 if (((ris0 & ric0) & BIT(q)) ||
735 ((tis & tic) & BIT(q))) {
736 if (napi_schedule_prep(&priv->napi[q])) {
737 /* Mask RX and TX interrupts */
738 ric0 &= ~BIT(q);
739 tic &= ~BIT(q);
740 ravb_write(ndev, ric0, RIC0);
741 ravb_write(ndev, tic, TIC);
742 __napi_schedule(&priv->napi[q]);
743 } else {
744 netdev_warn(ndev,
745 "ignoring interrupt, rx status 0x%08x, rx mask 0x%08x,\n",
746 ris0, ric0);
747 netdev_warn(ndev,
748 " tx status 0x%08x, tx mask 0x%08x.\n",
749 tis, tic);
750 }
751 result = IRQ_HANDLED;
752 }
753 }
754 }
755
756 /* E-MAC status summary */
757 if (iss & ISS_MS) {
758 ravb_emac_interrupt(ndev);
759 result = IRQ_HANDLED;
760 }
761
762 /* Error status summary */
763 if (iss & ISS_ES) {
764 ravb_error_interrupt(ndev);
765 result = IRQ_HANDLED;
766 }
767
768 if (iss & ISS_CGIS)
769 result = ravb_ptp_interrupt(ndev);
770
771 mmiowb();
772 spin_unlock(&priv->lock);
773 return result;
774 }
775
776 static int ravb_poll(struct napi_struct *napi, int budget)
777 {
778 struct net_device *ndev = napi->dev;
779 struct ravb_private *priv = netdev_priv(ndev);
780 unsigned long flags;
781 int q = napi - priv->napi;
782 int mask = BIT(q);
783 int quota = budget;
784 u32 ris0, tis;
785
786 for (;;) {
787 tis = ravb_read(ndev, TIS);
788 ris0 = ravb_read(ndev, RIS0);
789 if (!((ris0 & mask) || (tis & mask)))
790 break;
791
792 /* Processing RX Descriptor Ring */
793 if (ris0 & mask) {
794 /* Clear RX interrupt */
795 ravb_write(ndev, ~mask, RIS0);
796 if (ravb_rx(ndev, &quota, q))
797 goto out;
798 }
799 /* Processing TX Descriptor Ring */
800 if (tis & mask) {
801 spin_lock_irqsave(&priv->lock, flags);
802 /* Clear TX interrupt */
803 ravb_write(ndev, ~mask, TIS);
804 ravb_tx_free(ndev, q);
805 netif_wake_subqueue(ndev, q);
806 mmiowb();
807 spin_unlock_irqrestore(&priv->lock, flags);
808 }
809 }
810
811 napi_complete(napi);
812
813 /* Re-enable RX/TX interrupts */
814 spin_lock_irqsave(&priv->lock, flags);
815 ravb_write(ndev, ravb_read(ndev, RIC0) | mask, RIC0);
816 ravb_write(ndev, ravb_read(ndev, TIC) | mask, TIC);
817 mmiowb();
818 spin_unlock_irqrestore(&priv->lock, flags);
819
820 /* Receive error message handling */
821 priv->rx_over_errors = priv->stats[RAVB_BE].rx_over_errors;
822 priv->rx_over_errors += priv->stats[RAVB_NC].rx_over_errors;
823 if (priv->rx_over_errors != ndev->stats.rx_over_errors) {
824 ndev->stats.rx_over_errors = priv->rx_over_errors;
825 netif_err(priv, rx_err, ndev, "Receive Descriptor Empty\n");
826 }
827 if (priv->rx_fifo_errors != ndev->stats.rx_fifo_errors) {
828 ndev->stats.rx_fifo_errors = priv->rx_fifo_errors;
829 netif_err(priv, rx_err, ndev, "Receive FIFO Overflow\n");
830 }
831 out:
832 return budget - quota;
833 }
834
835 /* PHY state control function */
836 static void ravb_adjust_link(struct net_device *ndev)
837 {
838 struct ravb_private *priv = netdev_priv(ndev);
839 struct phy_device *phydev = priv->phydev;
840 bool new_state = false;
841
842 if (phydev->link) {
843 if (phydev->duplex != priv->duplex) {
844 new_state = true;
845 priv->duplex = phydev->duplex;
846 ravb_set_duplex(ndev);
847 }
848
849 if (phydev->speed != priv->speed) {
850 new_state = true;
851 priv->speed = phydev->speed;
852 ravb_set_rate(ndev);
853 }
854 if (!priv->link) {
855 ravb_write(ndev, ravb_read(ndev, ECMR) & ~ECMR_TXF,
856 ECMR);
857 new_state = true;
858 priv->link = phydev->link;
859 if (priv->no_avb_link)
860 ravb_rcv_snd_enable(ndev);
861 }
862 } else if (priv->link) {
863 new_state = true;
864 priv->link = 0;
865 priv->speed = 0;
866 priv->duplex = -1;
867 if (priv->no_avb_link)
868 ravb_rcv_snd_disable(ndev);
869 }
870
871 if (new_state && netif_msg_link(priv))
872 phy_print_status(phydev);
873 }
874
875 /* PHY init function */
876 static int ravb_phy_init(struct net_device *ndev)
877 {
878 struct device_node *np = ndev->dev.parent->of_node;
879 struct ravb_private *priv = netdev_priv(ndev);
880 struct phy_device *phydev;
881 struct device_node *pn;
882 int err;
883
884 priv->link = 0;
885 priv->speed = 0;
886 priv->duplex = -1;
887
888 /* Try connecting to PHY */
889 pn = of_parse_phandle(np, "phy-handle", 0);
890 if (!pn) {
891 /* In the case of a fixed PHY, the DT node associated
892 * to the PHY is the Ethernet MAC DT node.
893 */
894 if (of_phy_is_fixed_link(np)) {
895 err = of_phy_register_fixed_link(np);
896 if (err)
897 return err;
898 }
899 pn = of_node_get(np);
900 }
901 phydev = of_phy_connect(ndev, pn, ravb_adjust_link, 0,
902 priv->phy_interface);
903 if (!phydev) {
904 netdev_err(ndev, "failed to connect PHY\n");
905 return -ENOENT;
906 }
907
908 /* This driver only support 10/100Mbit speeds on Gen3
909 * at this time.
910 */
911 if (priv->chip_id == RCAR_GEN3) {
912 int err;
913
914 err = phy_set_max_speed(phydev, SPEED_100);
915 if (err) {
916 netdev_err(ndev, "failed to limit PHY to 100Mbit/s\n");
917 phy_disconnect(phydev);
918 return err;
919 }
920
921 netdev_info(ndev, "limited PHY to 100Mbit/s\n");
922 }
923
924 /* 10BASE is not supported */
925 phydev->supported &= ~PHY_10BT_FEATURES;
926
927 phy_attached_info(phydev);
928
929 priv->phydev = phydev;
930
931 return 0;
932 }
933
934 /* PHY control start function */
935 static int ravb_phy_start(struct net_device *ndev)
936 {
937 struct ravb_private *priv = netdev_priv(ndev);
938 int error;
939
940 error = ravb_phy_init(ndev);
941 if (error)
942 return error;
943
944 phy_start(priv->phydev);
945
946 return 0;
947 }
948
949 static int ravb_get_settings(struct net_device *ndev, struct ethtool_cmd *ecmd)
950 {
951 struct ravb_private *priv = netdev_priv(ndev);
952 int error = -ENODEV;
953 unsigned long flags;
954
955 if (priv->phydev) {
956 spin_lock_irqsave(&priv->lock, flags);
957 error = phy_ethtool_gset(priv->phydev, ecmd);
958 spin_unlock_irqrestore(&priv->lock, flags);
959 }
960
961 return error;
962 }
963
964 static int ravb_set_settings(struct net_device *ndev, struct ethtool_cmd *ecmd)
965 {
966 struct ravb_private *priv = netdev_priv(ndev);
967 unsigned long flags;
968 int error;
969
970 if (!priv->phydev)
971 return -ENODEV;
972
973 spin_lock_irqsave(&priv->lock, flags);
974
975 /* Disable TX and RX */
976 ravb_rcv_snd_disable(ndev);
977
978 error = phy_ethtool_sset(priv->phydev, ecmd);
979 if (error)
980 goto error_exit;
981
982 if (ecmd->duplex == DUPLEX_FULL)
983 priv->duplex = 1;
984 else
985 priv->duplex = 0;
986
987 ravb_set_duplex(ndev);
988
989 error_exit:
990 mdelay(1);
991
992 /* Enable TX and RX */
993 ravb_rcv_snd_enable(ndev);
994
995 mmiowb();
996 spin_unlock_irqrestore(&priv->lock, flags);
997
998 return error;
999 }
1000
1001 static int ravb_nway_reset(struct net_device *ndev)
1002 {
1003 struct ravb_private *priv = netdev_priv(ndev);
1004 int error = -ENODEV;
1005 unsigned long flags;
1006
1007 if (priv->phydev) {
1008 spin_lock_irqsave(&priv->lock, flags);
1009 error = phy_start_aneg(priv->phydev);
1010 spin_unlock_irqrestore(&priv->lock, flags);
1011 }
1012
1013 return error;
1014 }
1015
1016 static u32 ravb_get_msglevel(struct net_device *ndev)
1017 {
1018 struct ravb_private *priv = netdev_priv(ndev);
1019
1020 return priv->msg_enable;
1021 }
1022
1023 static void ravb_set_msglevel(struct net_device *ndev, u32 value)
1024 {
1025 struct ravb_private *priv = netdev_priv(ndev);
1026
1027 priv->msg_enable = value;
1028 }
1029
1030 static const char ravb_gstrings_stats[][ETH_GSTRING_LEN] = {
1031 "rx_queue_0_current",
1032 "tx_queue_0_current",
1033 "rx_queue_0_dirty",
1034 "tx_queue_0_dirty",
1035 "rx_queue_0_packets",
1036 "tx_queue_0_packets",
1037 "rx_queue_0_bytes",
1038 "tx_queue_0_bytes",
1039 "rx_queue_0_mcast_packets",
1040 "rx_queue_0_errors",
1041 "rx_queue_0_crc_errors",
1042 "rx_queue_0_frame_errors",
1043 "rx_queue_0_length_errors",
1044 "rx_queue_0_missed_errors",
1045 "rx_queue_0_over_errors",
1046
1047 "rx_queue_1_current",
1048 "tx_queue_1_current",
1049 "rx_queue_1_dirty",
1050 "tx_queue_1_dirty",
1051 "rx_queue_1_packets",
1052 "tx_queue_1_packets",
1053 "rx_queue_1_bytes",
1054 "tx_queue_1_bytes",
1055 "rx_queue_1_mcast_packets",
1056 "rx_queue_1_errors",
1057 "rx_queue_1_crc_errors",
1058 "rx_queue_1_frame_errors",
1059 "rx_queue_1_length_errors",
1060 "rx_queue_1_missed_errors",
1061 "rx_queue_1_over_errors",
1062 };
1063
1064 #define RAVB_STATS_LEN ARRAY_SIZE(ravb_gstrings_stats)
1065
1066 static int ravb_get_sset_count(struct net_device *netdev, int sset)
1067 {
1068 switch (sset) {
1069 case ETH_SS_STATS:
1070 return RAVB_STATS_LEN;
1071 default:
1072 return -EOPNOTSUPP;
1073 }
1074 }
1075
1076 static void ravb_get_ethtool_stats(struct net_device *ndev,
1077 struct ethtool_stats *stats, u64 *data)
1078 {
1079 struct ravb_private *priv = netdev_priv(ndev);
1080 int i = 0;
1081 int q;
1082
1083 /* Device-specific stats */
1084 for (q = RAVB_BE; q < NUM_RX_QUEUE; q++) {
1085 struct net_device_stats *stats = &priv->stats[q];
1086
1087 data[i++] = priv->cur_rx[q];
1088 data[i++] = priv->cur_tx[q];
1089 data[i++] = priv->dirty_rx[q];
1090 data[i++] = priv->dirty_tx[q];
1091 data[i++] = stats->rx_packets;
1092 data[i++] = stats->tx_packets;
1093 data[i++] = stats->rx_bytes;
1094 data[i++] = stats->tx_bytes;
1095 data[i++] = stats->multicast;
1096 data[i++] = stats->rx_errors;
1097 data[i++] = stats->rx_crc_errors;
1098 data[i++] = stats->rx_frame_errors;
1099 data[i++] = stats->rx_length_errors;
1100 data[i++] = stats->rx_missed_errors;
1101 data[i++] = stats->rx_over_errors;
1102 }
1103 }
1104
1105 static void ravb_get_strings(struct net_device *ndev, u32 stringset, u8 *data)
1106 {
1107 switch (stringset) {
1108 case ETH_SS_STATS:
1109 memcpy(data, *ravb_gstrings_stats, sizeof(ravb_gstrings_stats));
1110 break;
1111 }
1112 }
1113
1114 static void ravb_get_ringparam(struct net_device *ndev,
1115 struct ethtool_ringparam *ring)
1116 {
1117 struct ravb_private *priv = netdev_priv(ndev);
1118
1119 ring->rx_max_pending = BE_RX_RING_MAX;
1120 ring->tx_max_pending = BE_TX_RING_MAX;
1121 ring->rx_pending = priv->num_rx_ring[RAVB_BE];
1122 ring->tx_pending = priv->num_tx_ring[RAVB_BE];
1123 }
1124
1125 static int ravb_set_ringparam(struct net_device *ndev,
1126 struct ethtool_ringparam *ring)
1127 {
1128 struct ravb_private *priv = netdev_priv(ndev);
1129 int error;
1130
1131 if (ring->tx_pending > BE_TX_RING_MAX ||
1132 ring->rx_pending > BE_RX_RING_MAX ||
1133 ring->tx_pending < BE_TX_RING_MIN ||
1134 ring->rx_pending < BE_RX_RING_MIN)
1135 return -EINVAL;
1136 if (ring->rx_mini_pending || ring->rx_jumbo_pending)
1137 return -EINVAL;
1138
1139 if (netif_running(ndev)) {
1140 netif_device_detach(ndev);
1141 /* Stop PTP Clock driver */
1142 ravb_ptp_stop(ndev);
1143 /* Wait for DMA stopping */
1144 error = ravb_stop_dma(ndev);
1145 if (error) {
1146 netdev_err(ndev,
1147 "cannot set ringparam! Any AVB processes are still running?\n");
1148 return error;
1149 }
1150 synchronize_irq(ndev->irq);
1151
1152 /* Free all the skb's in the RX queue and the DMA buffers. */
1153 ravb_ring_free(ndev, RAVB_BE);
1154 ravb_ring_free(ndev, RAVB_NC);
1155 }
1156
1157 /* Set new parameters */
1158 priv->num_rx_ring[RAVB_BE] = ring->rx_pending;
1159 priv->num_tx_ring[RAVB_BE] = ring->tx_pending;
1160
1161 if (netif_running(ndev)) {
1162 error = ravb_dmac_init(ndev);
1163 if (error) {
1164 netdev_err(ndev,
1165 "%s: ravb_dmac_init() failed, error %d\n",
1166 __func__, error);
1167 return error;
1168 }
1169
1170 ravb_emac_init(ndev);
1171
1172 /* Initialise PTP Clock driver */
1173 ravb_ptp_init(ndev, priv->pdev);
1174
1175 netif_device_attach(ndev);
1176 }
1177
1178 return 0;
1179 }
1180
1181 static int ravb_get_ts_info(struct net_device *ndev,
1182 struct ethtool_ts_info *info)
1183 {
1184 struct ravb_private *priv = netdev_priv(ndev);
1185
1186 info->so_timestamping =
1187 SOF_TIMESTAMPING_TX_SOFTWARE |
1188 SOF_TIMESTAMPING_RX_SOFTWARE |
1189 SOF_TIMESTAMPING_SOFTWARE |
1190 SOF_TIMESTAMPING_TX_HARDWARE |
1191 SOF_TIMESTAMPING_RX_HARDWARE |
1192 SOF_TIMESTAMPING_RAW_HARDWARE;
1193 info->tx_types = (1 << HWTSTAMP_TX_OFF) | (1 << HWTSTAMP_TX_ON);
1194 info->rx_filters =
1195 (1 << HWTSTAMP_FILTER_NONE) |
1196 (1 << HWTSTAMP_FILTER_PTP_V2_L2_EVENT) |
1197 (1 << HWTSTAMP_FILTER_ALL);
1198 info->phc_index = ptp_clock_index(priv->ptp.clock);
1199
1200 return 0;
1201 }
1202
1203 static const struct ethtool_ops ravb_ethtool_ops = {
1204 .get_settings = ravb_get_settings,
1205 .set_settings = ravb_set_settings,
1206 .nway_reset = ravb_nway_reset,
1207 .get_msglevel = ravb_get_msglevel,
1208 .set_msglevel = ravb_set_msglevel,
1209 .get_link = ethtool_op_get_link,
1210 .get_strings = ravb_get_strings,
1211 .get_ethtool_stats = ravb_get_ethtool_stats,
1212 .get_sset_count = ravb_get_sset_count,
1213 .get_ringparam = ravb_get_ringparam,
1214 .set_ringparam = ravb_set_ringparam,
1215 .get_ts_info = ravb_get_ts_info,
1216 };
1217
1218 /* Network device open function for Ethernet AVB */
1219 static int ravb_open(struct net_device *ndev)
1220 {
1221 struct ravb_private *priv = netdev_priv(ndev);
1222 int error;
1223
1224 napi_enable(&priv->napi[RAVB_BE]);
1225 napi_enable(&priv->napi[RAVB_NC]);
1226
1227 error = request_irq(ndev->irq, ravb_interrupt, IRQF_SHARED, ndev->name,
1228 ndev);
1229 if (error) {
1230 netdev_err(ndev, "cannot request IRQ\n");
1231 goto out_napi_off;
1232 }
1233
1234 if (priv->chip_id == RCAR_GEN3) {
1235 error = request_irq(priv->emac_irq, ravb_interrupt,
1236 IRQF_SHARED, ndev->name, ndev);
1237 if (error) {
1238 netdev_err(ndev, "cannot request IRQ\n");
1239 goto out_free_irq;
1240 }
1241 }
1242
1243 /* Device init */
1244 error = ravb_dmac_init(ndev);
1245 if (error)
1246 goto out_free_irq2;
1247 ravb_emac_init(ndev);
1248
1249 /* Initialise PTP Clock driver */
1250 if (priv->chip_id == RCAR_GEN2)
1251 ravb_ptp_init(ndev, priv->pdev);
1252
1253 netif_tx_start_all_queues(ndev);
1254
1255 /* PHY control start */
1256 error = ravb_phy_start(ndev);
1257 if (error)
1258 goto out_ptp_stop;
1259
1260 return 0;
1261
1262 out_ptp_stop:
1263 /* Stop PTP Clock driver */
1264 if (priv->chip_id == RCAR_GEN2)
1265 ravb_ptp_stop(ndev);
1266 out_free_irq2:
1267 if (priv->chip_id == RCAR_GEN3)
1268 free_irq(priv->emac_irq, ndev);
1269 out_free_irq:
1270 free_irq(ndev->irq, ndev);
1271 out_napi_off:
1272 napi_disable(&priv->napi[RAVB_NC]);
1273 napi_disable(&priv->napi[RAVB_BE]);
1274 return error;
1275 }
1276
1277 /* Timeout function for Ethernet AVB */
1278 static void ravb_tx_timeout(struct net_device *ndev)
1279 {
1280 struct ravb_private *priv = netdev_priv(ndev);
1281
1282 netif_err(priv, tx_err, ndev,
1283 "transmit timed out, status %08x, resetting...\n",
1284 ravb_read(ndev, ISS));
1285
1286 /* tx_errors count up */
1287 ndev->stats.tx_errors++;
1288
1289 schedule_work(&priv->work);
1290 }
1291
1292 static void ravb_tx_timeout_work(struct work_struct *work)
1293 {
1294 struct ravb_private *priv = container_of(work, struct ravb_private,
1295 work);
1296 struct net_device *ndev = priv->ndev;
1297
1298 netif_tx_stop_all_queues(ndev);
1299
1300 /* Stop PTP Clock driver */
1301 ravb_ptp_stop(ndev);
1302
1303 /* Wait for DMA stopping */
1304 ravb_stop_dma(ndev);
1305
1306 ravb_ring_free(ndev, RAVB_BE);
1307 ravb_ring_free(ndev, RAVB_NC);
1308
1309 /* Device init */
1310 ravb_dmac_init(ndev);
1311 ravb_emac_init(ndev);
1312
1313 /* Initialise PTP Clock driver */
1314 ravb_ptp_init(ndev, priv->pdev);
1315
1316 netif_tx_start_all_queues(ndev);
1317 }
1318
1319 /* Packet transmit function for Ethernet AVB */
1320 static netdev_tx_t ravb_start_xmit(struct sk_buff *skb, struct net_device *ndev)
1321 {
1322 struct ravb_private *priv = netdev_priv(ndev);
1323 u16 q = skb_get_queue_mapping(skb);
1324 struct ravb_tstamp_skb *ts_skb;
1325 struct ravb_tx_desc *desc;
1326 unsigned long flags;
1327 u32 dma_addr;
1328 void *buffer;
1329 u32 entry;
1330 u32 len;
1331
1332 spin_lock_irqsave(&priv->lock, flags);
1333 if (priv->cur_tx[q] - priv->dirty_tx[q] > (priv->num_tx_ring[q] - 1) *
1334 NUM_TX_DESC) {
1335 netif_err(priv, tx_queued, ndev,
1336 "still transmitting with the full ring!\n");
1337 netif_stop_subqueue(ndev, q);
1338 spin_unlock_irqrestore(&priv->lock, flags);
1339 return NETDEV_TX_BUSY;
1340 }
1341 entry = priv->cur_tx[q] % (priv->num_tx_ring[q] * NUM_TX_DESC);
1342 priv->tx_skb[q][entry / NUM_TX_DESC] = skb;
1343
1344 if (skb_put_padto(skb, ETH_ZLEN))
1345 goto drop;
1346
1347 buffer = PTR_ALIGN(priv->tx_align[q], DPTR_ALIGN) +
1348 entry / NUM_TX_DESC * DPTR_ALIGN;
1349 len = PTR_ALIGN(skb->data, DPTR_ALIGN) - skb->data;
1350 memcpy(buffer, skb->data, len);
1351 dma_addr = dma_map_single(ndev->dev.parent, buffer, len, DMA_TO_DEVICE);
1352 if (dma_mapping_error(ndev->dev.parent, dma_addr))
1353 goto drop;
1354
1355 desc = &priv->tx_ring[q][entry];
1356 desc->ds_tagl = cpu_to_le16(len);
1357 desc->dptr = cpu_to_le32(dma_addr);
1358
1359 buffer = skb->data + len;
1360 len = skb->len - len;
1361 dma_addr = dma_map_single(ndev->dev.parent, buffer, len, DMA_TO_DEVICE);
1362 if (dma_mapping_error(ndev->dev.parent, dma_addr))
1363 goto unmap;
1364
1365 desc++;
1366 desc->ds_tagl = cpu_to_le16(len);
1367 desc->dptr = cpu_to_le32(dma_addr);
1368
1369 /* TX timestamp required */
1370 if (q == RAVB_NC) {
1371 ts_skb = kmalloc(sizeof(*ts_skb), GFP_ATOMIC);
1372 if (!ts_skb) {
1373 desc--;
1374 dma_unmap_single(ndev->dev.parent, dma_addr, len,
1375 DMA_TO_DEVICE);
1376 goto unmap;
1377 }
1378 ts_skb->skb = skb;
1379 ts_skb->tag = priv->ts_skb_tag++;
1380 priv->ts_skb_tag &= 0x3ff;
1381 list_add_tail(&ts_skb->list, &priv->ts_skb_list);
1382
1383 /* TAG and timestamp required flag */
1384 skb_shinfo(skb)->tx_flags |= SKBTX_IN_PROGRESS;
1385 skb_tx_timestamp(skb);
1386 desc->tagh_tsr = (ts_skb->tag >> 4) | TX_TSR;
1387 desc->ds_tagl |= le16_to_cpu(ts_skb->tag << 12);
1388 }
1389
1390 /* Descriptor type must be set after all the above writes */
1391 dma_wmb();
1392 desc->die_dt = DT_FEND;
1393 desc--;
1394 desc->die_dt = DT_FSTART;
1395
1396 ravb_write(ndev, ravb_read(ndev, TCCR) | (TCCR_TSRQ0 << q), TCCR);
1397
1398 priv->cur_tx[q] += NUM_TX_DESC;
1399 if (priv->cur_tx[q] - priv->dirty_tx[q] >
1400 (priv->num_tx_ring[q] - 1) * NUM_TX_DESC && !ravb_tx_free(ndev, q))
1401 netif_stop_subqueue(ndev, q);
1402
1403 exit:
1404 mmiowb();
1405 spin_unlock_irqrestore(&priv->lock, flags);
1406 return NETDEV_TX_OK;
1407
1408 unmap:
1409 dma_unmap_single(ndev->dev.parent, le32_to_cpu(desc->dptr),
1410 le16_to_cpu(desc->ds_tagl), DMA_TO_DEVICE);
1411 drop:
1412 dev_kfree_skb_any(skb);
1413 priv->tx_skb[q][entry / NUM_TX_DESC] = NULL;
1414 goto exit;
1415 }
1416
1417 static u16 ravb_select_queue(struct net_device *ndev, struct sk_buff *skb,
1418 void *accel_priv, select_queue_fallback_t fallback)
1419 {
1420 /* If skb needs TX timestamp, it is handled in network control queue */
1421 return (skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP) ? RAVB_NC :
1422 RAVB_BE;
1423
1424 }
1425
1426 static struct net_device_stats *ravb_get_stats(struct net_device *ndev)
1427 {
1428 struct ravb_private *priv = netdev_priv(ndev);
1429 struct net_device_stats *nstats, *stats0, *stats1;
1430
1431 nstats = &ndev->stats;
1432 stats0 = &priv->stats[RAVB_BE];
1433 stats1 = &priv->stats[RAVB_NC];
1434
1435 nstats->tx_dropped += ravb_read(ndev, TROCR);
1436 ravb_write(ndev, 0, TROCR); /* (write clear) */
1437 nstats->collisions += ravb_read(ndev, CDCR);
1438 ravb_write(ndev, 0, CDCR); /* (write clear) */
1439 nstats->tx_carrier_errors += ravb_read(ndev, LCCR);
1440 ravb_write(ndev, 0, LCCR); /* (write clear) */
1441
1442 nstats->tx_carrier_errors += ravb_read(ndev, CERCR);
1443 ravb_write(ndev, 0, CERCR); /* (write clear) */
1444 nstats->tx_carrier_errors += ravb_read(ndev, CEECR);
1445 ravb_write(ndev, 0, CEECR); /* (write clear) */
1446
1447 nstats->rx_packets = stats0->rx_packets + stats1->rx_packets;
1448 nstats->tx_packets = stats0->tx_packets + stats1->tx_packets;
1449 nstats->rx_bytes = stats0->rx_bytes + stats1->rx_bytes;
1450 nstats->tx_bytes = stats0->tx_bytes + stats1->tx_bytes;
1451 nstats->multicast = stats0->multicast + stats1->multicast;
1452 nstats->rx_errors = stats0->rx_errors + stats1->rx_errors;
1453 nstats->rx_crc_errors = stats0->rx_crc_errors + stats1->rx_crc_errors;
1454 nstats->rx_frame_errors =
1455 stats0->rx_frame_errors + stats1->rx_frame_errors;
1456 nstats->rx_length_errors =
1457 stats0->rx_length_errors + stats1->rx_length_errors;
1458 nstats->rx_missed_errors =
1459 stats0->rx_missed_errors + stats1->rx_missed_errors;
1460 nstats->rx_over_errors =
1461 stats0->rx_over_errors + stats1->rx_over_errors;
1462
1463 return nstats;
1464 }
1465
1466 /* Update promiscuous bit */
1467 static void ravb_set_rx_mode(struct net_device *ndev)
1468 {
1469 struct ravb_private *priv = netdev_priv(ndev);
1470 unsigned long flags;
1471 u32 ecmr;
1472
1473 spin_lock_irqsave(&priv->lock, flags);
1474 ecmr = ravb_read(ndev, ECMR);
1475 if (ndev->flags & IFF_PROMISC)
1476 ecmr |= ECMR_PRM;
1477 else
1478 ecmr &= ~ECMR_PRM;
1479 ravb_write(ndev, ecmr, ECMR);
1480 mmiowb();
1481 spin_unlock_irqrestore(&priv->lock, flags);
1482 }
1483
1484 /* Device close function for Ethernet AVB */
1485 static int ravb_close(struct net_device *ndev)
1486 {
1487 struct ravb_private *priv = netdev_priv(ndev);
1488 struct ravb_tstamp_skb *ts_skb, *ts_skb2;
1489
1490 netif_tx_stop_all_queues(ndev);
1491
1492 /* Disable interrupts by clearing the interrupt masks. */
1493 ravb_write(ndev, 0, RIC0);
1494 ravb_write(ndev, 0, RIC2);
1495 ravb_write(ndev, 0, TIC);
1496
1497 /* Stop PTP Clock driver */
1498 if (priv->chip_id == RCAR_GEN2)
1499 ravb_ptp_stop(ndev);
1500
1501 /* Set the config mode to stop the AVB-DMAC's processes */
1502 if (ravb_stop_dma(ndev) < 0)
1503 netdev_err(ndev,
1504 "device will be stopped after h/w processes are done.\n");
1505
1506 /* Clear the timestamp list */
1507 list_for_each_entry_safe(ts_skb, ts_skb2, &priv->ts_skb_list, list) {
1508 list_del(&ts_skb->list);
1509 kfree(ts_skb);
1510 }
1511
1512 /* PHY disconnect */
1513 if (priv->phydev) {
1514 phy_stop(priv->phydev);
1515 phy_disconnect(priv->phydev);
1516 priv->phydev = NULL;
1517 }
1518
1519 free_irq(ndev->irq, ndev);
1520
1521 napi_disable(&priv->napi[RAVB_NC]);
1522 napi_disable(&priv->napi[RAVB_BE]);
1523
1524 /* Free all the skb's in the RX queue and the DMA buffers. */
1525 ravb_ring_free(ndev, RAVB_BE);
1526 ravb_ring_free(ndev, RAVB_NC);
1527
1528 return 0;
1529 }
1530
1531 static int ravb_hwtstamp_get(struct net_device *ndev, struct ifreq *req)
1532 {
1533 struct ravb_private *priv = netdev_priv(ndev);
1534 struct hwtstamp_config config;
1535
1536 config.flags = 0;
1537 config.tx_type = priv->tstamp_tx_ctrl ? HWTSTAMP_TX_ON :
1538 HWTSTAMP_TX_OFF;
1539 if (priv->tstamp_rx_ctrl & RAVB_RXTSTAMP_TYPE_V2_L2_EVENT)
1540 config.rx_filter = HWTSTAMP_FILTER_PTP_V2_L2_EVENT;
1541 else if (priv->tstamp_rx_ctrl & RAVB_RXTSTAMP_TYPE_ALL)
1542 config.rx_filter = HWTSTAMP_FILTER_ALL;
1543 else
1544 config.rx_filter = HWTSTAMP_FILTER_NONE;
1545
1546 return copy_to_user(req->ifr_data, &config, sizeof(config)) ?
1547 -EFAULT : 0;
1548 }
1549
1550 /* Control hardware time stamping */
1551 static int ravb_hwtstamp_set(struct net_device *ndev, struct ifreq *req)
1552 {
1553 struct ravb_private *priv = netdev_priv(ndev);
1554 struct hwtstamp_config config;
1555 u32 tstamp_rx_ctrl = RAVB_RXTSTAMP_ENABLED;
1556 u32 tstamp_tx_ctrl;
1557
1558 if (copy_from_user(&config, req->ifr_data, sizeof(config)))
1559 return -EFAULT;
1560
1561 /* Reserved for future extensions */
1562 if (config.flags)
1563 return -EINVAL;
1564
1565 switch (config.tx_type) {
1566 case HWTSTAMP_TX_OFF:
1567 tstamp_tx_ctrl = 0;
1568 break;
1569 case HWTSTAMP_TX_ON:
1570 tstamp_tx_ctrl = RAVB_TXTSTAMP_ENABLED;
1571 break;
1572 default:
1573 return -ERANGE;
1574 }
1575
1576 switch (config.rx_filter) {
1577 case HWTSTAMP_FILTER_NONE:
1578 tstamp_rx_ctrl = 0;
1579 break;
1580 case HWTSTAMP_FILTER_PTP_V2_L2_EVENT:
1581 tstamp_rx_ctrl |= RAVB_RXTSTAMP_TYPE_V2_L2_EVENT;
1582 break;
1583 default:
1584 config.rx_filter = HWTSTAMP_FILTER_ALL;
1585 tstamp_rx_ctrl |= RAVB_RXTSTAMP_TYPE_ALL;
1586 }
1587
1588 priv->tstamp_tx_ctrl = tstamp_tx_ctrl;
1589 priv->tstamp_rx_ctrl = tstamp_rx_ctrl;
1590
1591 return copy_to_user(req->ifr_data, &config, sizeof(config)) ?
1592 -EFAULT : 0;
1593 }
1594
1595 /* ioctl to device function */
1596 static int ravb_do_ioctl(struct net_device *ndev, struct ifreq *req, int cmd)
1597 {
1598 struct ravb_private *priv = netdev_priv(ndev);
1599 struct phy_device *phydev = priv->phydev;
1600
1601 if (!netif_running(ndev))
1602 return -EINVAL;
1603
1604 if (!phydev)
1605 return -ENODEV;
1606
1607 switch (cmd) {
1608 case SIOCGHWTSTAMP:
1609 return ravb_hwtstamp_get(ndev, req);
1610 case SIOCSHWTSTAMP:
1611 return ravb_hwtstamp_set(ndev, req);
1612 }
1613
1614 return phy_mii_ioctl(phydev, req, cmd);
1615 }
1616
1617 static const struct net_device_ops ravb_netdev_ops = {
1618 .ndo_open = ravb_open,
1619 .ndo_stop = ravb_close,
1620 .ndo_start_xmit = ravb_start_xmit,
1621 .ndo_select_queue = ravb_select_queue,
1622 .ndo_get_stats = ravb_get_stats,
1623 .ndo_set_rx_mode = ravb_set_rx_mode,
1624 .ndo_tx_timeout = ravb_tx_timeout,
1625 .ndo_do_ioctl = ravb_do_ioctl,
1626 .ndo_validate_addr = eth_validate_addr,
1627 .ndo_set_mac_address = eth_mac_addr,
1628 .ndo_change_mtu = eth_change_mtu,
1629 };
1630
1631 /* MDIO bus init function */
1632 static int ravb_mdio_init(struct ravb_private *priv)
1633 {
1634 struct platform_device *pdev = priv->pdev;
1635 struct device *dev = &pdev->dev;
1636 int error;
1637
1638 /* Bitbang init */
1639 priv->mdiobb.ops = &bb_ops;
1640
1641 /* MII controller setting */
1642 priv->mii_bus = alloc_mdio_bitbang(&priv->mdiobb);
1643 if (!priv->mii_bus)
1644 return -ENOMEM;
1645
1646 /* Hook up MII support for ethtool */
1647 priv->mii_bus->name = "ravb_mii";
1648 priv->mii_bus->parent = dev;
1649 snprintf(priv->mii_bus->id, MII_BUS_ID_SIZE, "%s-%x",
1650 pdev->name, pdev->id);
1651
1652 /* Register MDIO bus */
1653 error = of_mdiobus_register(priv->mii_bus, dev->of_node);
1654 if (error)
1655 goto out_free_bus;
1656
1657 return 0;
1658
1659 out_free_bus:
1660 free_mdio_bitbang(priv->mii_bus);
1661 return error;
1662 }
1663
1664 /* MDIO bus release function */
1665 static int ravb_mdio_release(struct ravb_private *priv)
1666 {
1667 /* Unregister mdio bus */
1668 mdiobus_unregister(priv->mii_bus);
1669
1670 /* Free bitbang info */
1671 free_mdio_bitbang(priv->mii_bus);
1672
1673 return 0;
1674 }
1675
1676 static const struct of_device_id ravb_match_table[] = {
1677 { .compatible = "renesas,etheravb-r8a7790", .data = (void *)RCAR_GEN2 },
1678 { .compatible = "renesas,etheravb-r8a7794", .data = (void *)RCAR_GEN2 },
1679 { .compatible = "renesas,etheravb-rcar-gen2", .data = (void *)RCAR_GEN2 },
1680 { .compatible = "renesas,etheravb-r8a7795", .data = (void *)RCAR_GEN3 },
1681 { .compatible = "renesas,etheravb-rcar-gen3", .data = (void *)RCAR_GEN3 },
1682 { }
1683 };
1684 MODULE_DEVICE_TABLE(of, ravb_match_table);
1685
1686 static int ravb_set_gti(struct net_device *ndev)
1687 {
1688
1689 struct device *dev = ndev->dev.parent;
1690 struct device_node *np = dev->of_node;
1691 unsigned long rate;
1692 struct clk *clk;
1693 uint64_t inc;
1694
1695 clk = of_clk_get(np, 0);
1696 if (IS_ERR(clk)) {
1697 dev_err(dev, "could not get clock\n");
1698 return PTR_ERR(clk);
1699 }
1700
1701 rate = clk_get_rate(clk);
1702 clk_put(clk);
1703
1704 inc = 1000000000ULL << 20;
1705 do_div(inc, rate);
1706
1707 if (inc < GTI_TIV_MIN || inc > GTI_TIV_MAX) {
1708 dev_err(dev, "gti.tiv increment 0x%llx is outside the range 0x%x - 0x%x\n",
1709 inc, GTI_TIV_MIN, GTI_TIV_MAX);
1710 return -EINVAL;
1711 }
1712
1713 ravb_write(ndev, inc, GTI);
1714
1715 return 0;
1716 }
1717
1718 static int ravb_probe(struct platform_device *pdev)
1719 {
1720 struct device_node *np = pdev->dev.of_node;
1721 const struct of_device_id *match;
1722 struct ravb_private *priv;
1723 enum ravb_chip_id chip_id;
1724 struct net_device *ndev;
1725 int error, irq, q;
1726 struct resource *res;
1727
1728 if (!np) {
1729 dev_err(&pdev->dev,
1730 "this driver is required to be instantiated from device tree\n");
1731 return -EINVAL;
1732 }
1733
1734 /* Get base address */
1735 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1736 if (!res) {
1737 dev_err(&pdev->dev, "invalid resource\n");
1738 return -EINVAL;
1739 }
1740
1741 ndev = alloc_etherdev_mqs(sizeof(struct ravb_private),
1742 NUM_TX_QUEUE, NUM_RX_QUEUE);
1743 if (!ndev)
1744 return -ENOMEM;
1745
1746 pm_runtime_enable(&pdev->dev);
1747 pm_runtime_get_sync(&pdev->dev);
1748
1749 /* The Ether-specific entries in the device structure. */
1750 ndev->base_addr = res->start;
1751 ndev->dma = -1;
1752
1753 match = of_match_device(of_match_ptr(ravb_match_table), &pdev->dev);
1754 chip_id = (enum ravb_chip_id)match->data;
1755
1756 if (chip_id == RCAR_GEN3)
1757 irq = platform_get_irq_byname(pdev, "ch22");
1758 else
1759 irq = platform_get_irq(pdev, 0);
1760 if (irq < 0) {
1761 error = irq;
1762 goto out_release;
1763 }
1764 ndev->irq = irq;
1765
1766 SET_NETDEV_DEV(ndev, &pdev->dev);
1767
1768 priv = netdev_priv(ndev);
1769 priv->ndev = ndev;
1770 priv->pdev = pdev;
1771 priv->num_tx_ring[RAVB_BE] = BE_TX_RING_SIZE;
1772 priv->num_rx_ring[RAVB_BE] = BE_RX_RING_SIZE;
1773 priv->num_tx_ring[RAVB_NC] = NC_TX_RING_SIZE;
1774 priv->num_rx_ring[RAVB_NC] = NC_RX_RING_SIZE;
1775 priv->addr = devm_ioremap_resource(&pdev->dev, res);
1776 if (IS_ERR(priv->addr)) {
1777 error = PTR_ERR(priv->addr);
1778 goto out_release;
1779 }
1780
1781 spin_lock_init(&priv->lock);
1782 INIT_WORK(&priv->work, ravb_tx_timeout_work);
1783
1784 priv->phy_interface = of_get_phy_mode(np);
1785
1786 priv->no_avb_link = of_property_read_bool(np, "renesas,no-ether-link");
1787 priv->avb_link_active_low =
1788 of_property_read_bool(np, "renesas,ether-link-active-low");
1789
1790 if (chip_id == RCAR_GEN3) {
1791 irq = platform_get_irq_byname(pdev, "ch24");
1792 if (irq < 0) {
1793 error = irq;
1794 goto out_release;
1795 }
1796 priv->emac_irq = irq;
1797 }
1798
1799 priv->chip_id = chip_id;
1800
1801 /* Set function */
1802 ndev->netdev_ops = &ravb_netdev_ops;
1803 ndev->ethtool_ops = &ravb_ethtool_ops;
1804
1805 /* Set AVB config mode */
1806 if (chip_id == RCAR_GEN2) {
1807 ravb_write(ndev, (ravb_read(ndev, CCC) & ~CCC_OPC) |
1808 CCC_OPC_CONFIG, CCC);
1809 /* Set CSEL value */
1810 ravb_write(ndev, (ravb_read(ndev, CCC) & ~CCC_CSEL) |
1811 CCC_CSEL_HPB, CCC);
1812 } else {
1813 ravb_write(ndev, (ravb_read(ndev, CCC) & ~CCC_OPC) |
1814 CCC_OPC_CONFIG | CCC_GAC | CCC_CSEL_HPB, CCC);
1815 }
1816
1817 /* Set CSEL value */
1818 ravb_write(ndev, (ravb_read(ndev, CCC) & ~CCC_CSEL) | CCC_CSEL_HPB,
1819 CCC);
1820
1821 /* Set GTI value */
1822 error = ravb_set_gti(ndev);
1823 if (error)
1824 goto out_release;
1825
1826 /* Request GTI loading */
1827 ravb_write(ndev, ravb_read(ndev, GCCR) | GCCR_LTI, GCCR);
1828
1829 /* Allocate descriptor base address table */
1830 priv->desc_bat_size = sizeof(struct ravb_desc) * DBAT_ENTRY_NUM;
1831 priv->desc_bat = dma_alloc_coherent(ndev->dev.parent, priv->desc_bat_size,
1832 &priv->desc_bat_dma, GFP_KERNEL);
1833 if (!priv->desc_bat) {
1834 dev_err(&pdev->dev,
1835 "Cannot allocate desc base address table (size %d bytes)\n",
1836 priv->desc_bat_size);
1837 error = -ENOMEM;
1838 goto out_release;
1839 }
1840 for (q = RAVB_BE; q < DBAT_ENTRY_NUM; q++)
1841 priv->desc_bat[q].die_dt = DT_EOS;
1842 ravb_write(ndev, priv->desc_bat_dma, DBAT);
1843
1844 /* Initialise HW timestamp list */
1845 INIT_LIST_HEAD(&priv->ts_skb_list);
1846
1847 /* Initialise PTP Clock driver */
1848 if (chip_id != RCAR_GEN2)
1849 ravb_ptp_init(ndev, pdev);
1850
1851 /* Debug message level */
1852 priv->msg_enable = RAVB_DEF_MSG_ENABLE;
1853
1854 /* Read and set MAC address */
1855 ravb_read_mac_address(ndev, of_get_mac_address(np));
1856 if (!is_valid_ether_addr(ndev->dev_addr)) {
1857 dev_warn(&pdev->dev,
1858 "no valid MAC address supplied, using a random one\n");
1859 eth_hw_addr_random(ndev);
1860 }
1861
1862 /* MDIO bus init */
1863 error = ravb_mdio_init(priv);
1864 if (error) {
1865 dev_err(&pdev->dev, "failed to initialize MDIO\n");
1866 goto out_dma_free;
1867 }
1868
1869 netif_napi_add(ndev, &priv->napi[RAVB_BE], ravb_poll, 64);
1870 netif_napi_add(ndev, &priv->napi[RAVB_NC], ravb_poll, 64);
1871
1872 /* Network device register */
1873 error = register_netdev(ndev);
1874 if (error)
1875 goto out_napi_del;
1876
1877 /* Print device information */
1878 netdev_info(ndev, "Base address at %#x, %pM, IRQ %d.\n",
1879 (u32)ndev->base_addr, ndev->dev_addr, ndev->irq);
1880
1881 platform_set_drvdata(pdev, ndev);
1882
1883 return 0;
1884
1885 out_napi_del:
1886 netif_napi_del(&priv->napi[RAVB_NC]);
1887 netif_napi_del(&priv->napi[RAVB_BE]);
1888 ravb_mdio_release(priv);
1889 out_dma_free:
1890 dma_free_coherent(ndev->dev.parent, priv->desc_bat_size, priv->desc_bat,
1891 priv->desc_bat_dma);
1892
1893 /* Stop PTP Clock driver */
1894 if (chip_id != RCAR_GEN2)
1895 ravb_ptp_stop(ndev);
1896 out_release:
1897 if (ndev)
1898 free_netdev(ndev);
1899
1900 pm_runtime_put(&pdev->dev);
1901 pm_runtime_disable(&pdev->dev);
1902 return error;
1903 }
1904
1905 static int ravb_remove(struct platform_device *pdev)
1906 {
1907 struct net_device *ndev = platform_get_drvdata(pdev);
1908 struct ravb_private *priv = netdev_priv(ndev);
1909
1910 /* Stop PTP Clock driver */
1911 if (priv->chip_id != RCAR_GEN2)
1912 ravb_ptp_stop(ndev);
1913
1914 dma_free_coherent(ndev->dev.parent, priv->desc_bat_size, priv->desc_bat,
1915 priv->desc_bat_dma);
1916 /* Set reset mode */
1917 ravb_write(ndev, CCC_OPC_RESET, CCC);
1918 pm_runtime_put_sync(&pdev->dev);
1919 unregister_netdev(ndev);
1920 netif_napi_del(&priv->napi[RAVB_NC]);
1921 netif_napi_del(&priv->napi[RAVB_BE]);
1922 ravb_mdio_release(priv);
1923 pm_runtime_disable(&pdev->dev);
1924 free_netdev(ndev);
1925 platform_set_drvdata(pdev, NULL);
1926
1927 return 0;
1928 }
1929
1930 #ifdef CONFIG_PM
1931 static int ravb_runtime_nop(struct device *dev)
1932 {
1933 /* Runtime PM callback shared between ->runtime_suspend()
1934 * and ->runtime_resume(). Simply returns success.
1935 *
1936 * This driver re-initializes all registers after
1937 * pm_runtime_get_sync() anyway so there is no need
1938 * to save and restore registers here.
1939 */
1940 return 0;
1941 }
1942
1943 static const struct dev_pm_ops ravb_dev_pm_ops = {
1944 .runtime_suspend = ravb_runtime_nop,
1945 .runtime_resume = ravb_runtime_nop,
1946 };
1947
1948 #define RAVB_PM_OPS (&ravb_dev_pm_ops)
1949 #else
1950 #define RAVB_PM_OPS NULL
1951 #endif
1952
1953 static struct platform_driver ravb_driver = {
1954 .probe = ravb_probe,
1955 .remove = ravb_remove,
1956 .driver = {
1957 .name = "ravb",
1958 .pm = RAVB_PM_OPS,
1959 .of_match_table = ravb_match_table,
1960 },
1961 };
1962
1963 module_platform_driver(ravb_driver);
1964
1965 MODULE_AUTHOR("Mitsuhiro Kimura, Masaru Nagai");
1966 MODULE_DESCRIPTION("Renesas Ethernet AVB driver");
1967 MODULE_LICENSE("GPL v2");
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