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UBUNTU: Ubuntu-4.10.0-37.41
[mirror_ubuntu-zesty-kernel.git] / drivers / net / ethernet / apm / xgene / xgene_enet_main.c
1 /* Applied Micro X-Gene SoC Ethernet Driver
2 *
3 * Copyright (c) 2014, Applied Micro Circuits Corporation
4 * Authors: Iyappan Subramanian <isubramanian@apm.com>
5 * Ravi Patel <rapatel@apm.com>
6 * Keyur Chudgar <kchudgar@apm.com>
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the
10 * Free Software Foundation; either version 2 of the License, or (at your
11 * option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program. If not, see <http://www.gnu.org/licenses/>.
20 */
21
22 #include <linux/gpio.h>
23 #include "xgene_enet_main.h"
24 #include "xgene_enet_hw.h"
25 #include "xgene_enet_sgmac.h"
26 #include "xgene_enet_xgmac.h"
27
28 #define RES_ENET_CSR 0
29 #define RES_RING_CSR 1
30 #define RES_RING_CMD 2
31
32 static const struct of_device_id xgene_enet_of_match[];
33 static const struct acpi_device_id xgene_enet_acpi_match[];
34
35 static void xgene_enet_init_bufpool(struct xgene_enet_desc_ring *buf_pool)
36 {
37 struct xgene_enet_raw_desc16 *raw_desc;
38 int i;
39
40 if (!buf_pool)
41 return;
42
43 for (i = 0; i < buf_pool->slots; i++) {
44 raw_desc = &buf_pool->raw_desc16[i];
45
46 /* Hardware expects descriptor in little endian format */
47 raw_desc->m0 = cpu_to_le64(i |
48 SET_VAL(FPQNUM, buf_pool->dst_ring_num) |
49 SET_VAL(STASH, 3));
50 }
51 }
52
53 static u16 xgene_enet_get_data_len(u64 bufdatalen)
54 {
55 u16 hw_len, mask;
56
57 hw_len = GET_VAL(BUFDATALEN, bufdatalen);
58
59 if (unlikely(hw_len == 0x7800)) {
60 return 0;
61 } else if (!(hw_len & BIT(14))) {
62 mask = GENMASK(13, 0);
63 return (hw_len & mask) ? (hw_len & mask) : SIZE_16K;
64 } else if (!(hw_len & GENMASK(13, 12))) {
65 mask = GENMASK(11, 0);
66 return (hw_len & mask) ? (hw_len & mask) : SIZE_4K;
67 } else {
68 mask = GENMASK(11, 0);
69 return (hw_len & mask) ? (hw_len & mask) : SIZE_2K;
70 }
71 }
72
73 static u16 xgene_enet_set_data_len(u32 size)
74 {
75 u16 hw_len;
76
77 hw_len = (size == SIZE_4K) ? BIT(14) : 0;
78
79 return hw_len;
80 }
81
82 static int xgene_enet_refill_pagepool(struct xgene_enet_desc_ring *buf_pool,
83 u32 nbuf)
84 {
85 struct xgene_enet_raw_desc16 *raw_desc;
86 struct xgene_enet_pdata *pdata;
87 struct net_device *ndev;
88 dma_addr_t dma_addr;
89 struct device *dev;
90 struct page *page;
91 u32 slots, tail;
92 u16 hw_len;
93 int i;
94
95 if (unlikely(!buf_pool))
96 return 0;
97
98 ndev = buf_pool->ndev;
99 pdata = netdev_priv(ndev);
100 dev = ndev_to_dev(ndev);
101 slots = buf_pool->slots - 1;
102 tail = buf_pool->tail;
103
104 for (i = 0; i < nbuf; i++) {
105 raw_desc = &buf_pool->raw_desc16[tail];
106
107 page = dev_alloc_page();
108 if (unlikely(!page))
109 return -ENOMEM;
110
111 dma_addr = dma_map_page(dev, page, 0,
112 PAGE_SIZE, DMA_FROM_DEVICE);
113 if (unlikely(dma_mapping_error(dev, dma_addr))) {
114 put_page(page);
115 return -ENOMEM;
116 }
117
118 hw_len = xgene_enet_set_data_len(PAGE_SIZE);
119 raw_desc->m1 = cpu_to_le64(SET_VAL(DATAADDR, dma_addr) |
120 SET_VAL(BUFDATALEN, hw_len) |
121 SET_BIT(COHERENT));
122
123 buf_pool->frag_page[tail] = page;
124 tail = (tail + 1) & slots;
125 }
126
127 pdata->ring_ops->wr_cmd(buf_pool, nbuf);
128 buf_pool->tail = tail;
129
130 return 0;
131 }
132
133 static int xgene_enet_refill_bufpool(struct xgene_enet_desc_ring *buf_pool,
134 u32 nbuf)
135 {
136 struct sk_buff *skb;
137 struct xgene_enet_raw_desc16 *raw_desc;
138 struct xgene_enet_pdata *pdata;
139 struct net_device *ndev;
140 struct device *dev;
141 dma_addr_t dma_addr;
142 u32 tail = buf_pool->tail;
143 u32 slots = buf_pool->slots - 1;
144 u16 bufdatalen, len;
145 int i;
146
147 ndev = buf_pool->ndev;
148 dev = ndev_to_dev(buf_pool->ndev);
149 pdata = netdev_priv(ndev);
150
151 bufdatalen = BUF_LEN_CODE_2K | (SKB_BUFFER_SIZE & GENMASK(11, 0));
152 len = XGENE_ENET_STD_MTU;
153
154 for (i = 0; i < nbuf; i++) {
155 raw_desc = &buf_pool->raw_desc16[tail];
156
157 skb = netdev_alloc_skb_ip_align(ndev, len);
158 if (unlikely(!skb))
159 return -ENOMEM;
160
161 dma_addr = dma_map_single(dev, skb->data, len, DMA_FROM_DEVICE);
162 if (dma_mapping_error(dev, dma_addr)) {
163 netdev_err(ndev, "DMA mapping error\n");
164 dev_kfree_skb_any(skb);
165 return -EINVAL;
166 }
167
168 buf_pool->rx_skb[tail] = skb;
169
170 raw_desc->m1 = cpu_to_le64(SET_VAL(DATAADDR, dma_addr) |
171 SET_VAL(BUFDATALEN, bufdatalen) |
172 SET_BIT(COHERENT));
173 tail = (tail + 1) & slots;
174 }
175
176 pdata->ring_ops->wr_cmd(buf_pool, nbuf);
177 buf_pool->tail = tail;
178
179 return 0;
180 }
181
182 static u8 xgene_enet_hdr_len(const void *data)
183 {
184 const struct ethhdr *eth = data;
185
186 return (eth->h_proto == htons(ETH_P_8021Q)) ? VLAN_ETH_HLEN : ETH_HLEN;
187 }
188
189 static void xgene_enet_delete_bufpool(struct xgene_enet_desc_ring *buf_pool)
190 {
191 struct device *dev = ndev_to_dev(buf_pool->ndev);
192 struct xgene_enet_raw_desc16 *raw_desc;
193 dma_addr_t dma_addr;
194 int i;
195
196 /* Free up the buffers held by hardware */
197 for (i = 0; i < buf_pool->slots; i++) {
198 if (buf_pool->rx_skb[i]) {
199 dev_kfree_skb_any(buf_pool->rx_skb[i]);
200
201 raw_desc = &buf_pool->raw_desc16[i];
202 dma_addr = GET_VAL(DATAADDR, le64_to_cpu(raw_desc->m1));
203 dma_unmap_single(dev, dma_addr, XGENE_ENET_MAX_MTU,
204 DMA_FROM_DEVICE);
205 }
206 }
207 }
208
209 static void xgene_enet_delete_pagepool(struct xgene_enet_desc_ring *buf_pool)
210 {
211 struct device *dev = ndev_to_dev(buf_pool->ndev);
212 dma_addr_t dma_addr;
213 struct page *page;
214 int i;
215
216 /* Free up the buffers held by hardware */
217 for (i = 0; i < buf_pool->slots; i++) {
218 page = buf_pool->frag_page[i];
219 if (page) {
220 dma_addr = buf_pool->frag_dma_addr[i];
221 dma_unmap_page(dev, dma_addr, PAGE_SIZE,
222 DMA_FROM_DEVICE);
223 put_page(page);
224 }
225 }
226 }
227
228 static irqreturn_t xgene_enet_rx_irq(const int irq, void *data)
229 {
230 struct xgene_enet_desc_ring *rx_ring = data;
231
232 if (napi_schedule_prep(&rx_ring->napi)) {
233 disable_irq_nosync(irq);
234 __napi_schedule(&rx_ring->napi);
235 }
236
237 return IRQ_HANDLED;
238 }
239
240 static int xgene_enet_tx_completion(struct xgene_enet_desc_ring *cp_ring,
241 struct xgene_enet_raw_desc *raw_desc)
242 {
243 struct xgene_enet_pdata *pdata = netdev_priv(cp_ring->ndev);
244 struct sk_buff *skb;
245 struct device *dev;
246 skb_frag_t *frag;
247 dma_addr_t *frag_dma_addr;
248 u16 skb_index;
249 u8 status;
250 int i, ret = 0;
251 u8 mss_index;
252
253 skb_index = GET_VAL(USERINFO, le64_to_cpu(raw_desc->m0));
254 skb = cp_ring->cp_skb[skb_index];
255 frag_dma_addr = &cp_ring->frag_dma_addr[skb_index * MAX_SKB_FRAGS];
256
257 dev = ndev_to_dev(cp_ring->ndev);
258 dma_unmap_single(dev, GET_VAL(DATAADDR, le64_to_cpu(raw_desc->m1)),
259 skb_headlen(skb),
260 DMA_TO_DEVICE);
261
262 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
263 frag = &skb_shinfo(skb)->frags[i];
264 dma_unmap_page(dev, frag_dma_addr[i], skb_frag_size(frag),
265 DMA_TO_DEVICE);
266 }
267
268 if (GET_BIT(ET, le64_to_cpu(raw_desc->m3))) {
269 mss_index = GET_VAL(MSS, le64_to_cpu(raw_desc->m3));
270 spin_lock(&pdata->mss_lock);
271 pdata->mss_refcnt[mss_index]--;
272 spin_unlock(&pdata->mss_lock);
273 }
274
275 /* Checking for error */
276 status = GET_VAL(LERR, le64_to_cpu(raw_desc->m0));
277 if (unlikely(status > 2)) {
278 xgene_enet_parse_error(cp_ring, netdev_priv(cp_ring->ndev),
279 status);
280 ret = -EIO;
281 }
282
283 if (likely(skb)) {
284 dev_kfree_skb_any(skb);
285 } else {
286 netdev_err(cp_ring->ndev, "completion skb is NULL\n");
287 ret = -EIO;
288 }
289
290 return ret;
291 }
292
293 static int xgene_enet_setup_mss(struct net_device *ndev, u32 mss)
294 {
295 struct xgene_enet_pdata *pdata = netdev_priv(ndev);
296 bool mss_index_found = false;
297 int mss_index;
298 int i;
299
300 spin_lock(&pdata->mss_lock);
301
302 /* Reuse the slot if MSS matches */
303 for (i = 0; !mss_index_found && i < NUM_MSS_REG; i++) {
304 if (pdata->mss[i] == mss) {
305 pdata->mss_refcnt[i]++;
306 mss_index = i;
307 mss_index_found = true;
308 }
309 }
310
311 /* Overwrite the slot with ref_count = 0 */
312 for (i = 0; !mss_index_found && i < NUM_MSS_REG; i++) {
313 if (!pdata->mss_refcnt[i]) {
314 pdata->mss_refcnt[i]++;
315 pdata->mac_ops->set_mss(pdata, mss, i);
316 pdata->mss[i] = mss;
317 mss_index = i;
318 mss_index_found = true;
319 }
320 }
321
322 /* No slots with ref_count = 0 available, return busy */
323 if (!mss_index_found)
324 mss_index = -EBUSY;
325
326 spin_unlock(&pdata->mss_lock);
327
328 return mss_index;
329 }
330
331 static int xgene_enet_work_msg(struct sk_buff *skb, u64 *hopinfo)
332 {
333 struct net_device *ndev = skb->dev;
334 struct iphdr *iph;
335 u8 l3hlen = 0, l4hlen = 0;
336 u8 ethhdr, proto = 0, csum_enable = 0;
337 u32 hdr_len, mss = 0;
338 u32 i, len, nr_frags;
339 int mss_index;
340
341 ethhdr = xgene_enet_hdr_len(skb->data);
342
343 if (unlikely(skb->protocol != htons(ETH_P_IP)) &&
344 unlikely(skb->protocol != htons(ETH_P_8021Q)))
345 goto out;
346
347 if (unlikely(!(skb->dev->features & NETIF_F_IP_CSUM)))
348 goto out;
349
350 iph = ip_hdr(skb);
351 if (unlikely(ip_is_fragment(iph)))
352 goto out;
353
354 if (likely(iph->protocol == IPPROTO_TCP)) {
355 l4hlen = tcp_hdrlen(skb) >> 2;
356 csum_enable = 1;
357 proto = TSO_IPPROTO_TCP;
358 if (ndev->features & NETIF_F_TSO) {
359 hdr_len = ethhdr + ip_hdrlen(skb) + tcp_hdrlen(skb);
360 mss = skb_shinfo(skb)->gso_size;
361
362 if (skb_is_nonlinear(skb)) {
363 len = skb_headlen(skb);
364 nr_frags = skb_shinfo(skb)->nr_frags;
365
366 for (i = 0; i < 2 && i < nr_frags; i++)
367 len += skb_shinfo(skb)->frags[i].size;
368
369 /* HW requires header must reside in 3 buffer */
370 if (unlikely(hdr_len > len)) {
371 if (skb_linearize(skb))
372 return 0;
373 }
374 }
375
376 if (!mss || ((skb->len - hdr_len) <= mss))
377 goto out;
378
379 mss_index = xgene_enet_setup_mss(ndev, mss);
380 if (unlikely(mss_index < 0))
381 return -EBUSY;
382
383 *hopinfo |= SET_BIT(ET) | SET_VAL(MSS, mss_index);
384 }
385 } else if (iph->protocol == IPPROTO_UDP) {
386 l4hlen = UDP_HDR_SIZE;
387 csum_enable = 1;
388 }
389 out:
390 l3hlen = ip_hdrlen(skb) >> 2;
391 *hopinfo |= SET_VAL(TCPHDR, l4hlen) |
392 SET_VAL(IPHDR, l3hlen) |
393 SET_VAL(ETHHDR, ethhdr) |
394 SET_VAL(EC, csum_enable) |
395 SET_VAL(IS, proto) |
396 SET_BIT(IC) |
397 SET_BIT(TYPE_ETH_WORK_MESSAGE);
398
399 return 0;
400 }
401
402 static u16 xgene_enet_encode_len(u16 len)
403 {
404 return (len == BUFLEN_16K) ? 0 : len;
405 }
406
407 static void xgene_set_addr_len(__le64 *desc, u32 idx, dma_addr_t addr, u32 len)
408 {
409 desc[idx ^ 1] = cpu_to_le64(SET_VAL(DATAADDR, addr) |
410 SET_VAL(BUFDATALEN, len));
411 }
412
413 static __le64 *xgene_enet_get_exp_bufs(struct xgene_enet_desc_ring *ring)
414 {
415 __le64 *exp_bufs;
416
417 exp_bufs = &ring->exp_bufs[ring->exp_buf_tail * MAX_EXP_BUFFS];
418 memset(exp_bufs, 0, sizeof(__le64) * MAX_EXP_BUFFS);
419 ring->exp_buf_tail = (ring->exp_buf_tail + 1) & ((ring->slots / 2) - 1);
420
421 return exp_bufs;
422 }
423
424 static dma_addr_t *xgene_get_frag_dma_array(struct xgene_enet_desc_ring *ring)
425 {
426 return &ring->cp_ring->frag_dma_addr[ring->tail * MAX_SKB_FRAGS];
427 }
428
429 static int xgene_enet_setup_tx_desc(struct xgene_enet_desc_ring *tx_ring,
430 struct sk_buff *skb)
431 {
432 struct device *dev = ndev_to_dev(tx_ring->ndev);
433 struct xgene_enet_pdata *pdata = netdev_priv(tx_ring->ndev);
434 struct xgene_enet_raw_desc *raw_desc;
435 __le64 *exp_desc = NULL, *exp_bufs = NULL;
436 dma_addr_t dma_addr, pbuf_addr, *frag_dma_addr;
437 skb_frag_t *frag;
438 u16 tail = tx_ring->tail;
439 u64 hopinfo = 0;
440 u32 len, hw_len;
441 u8 ll = 0, nv = 0, idx = 0;
442 bool split = false;
443 u32 size, offset, ell_bytes = 0;
444 u32 i, fidx, nr_frags, count = 1;
445 int ret;
446
447 raw_desc = &tx_ring->raw_desc[tail];
448 tail = (tail + 1) & (tx_ring->slots - 1);
449 memset(raw_desc, 0, sizeof(struct xgene_enet_raw_desc));
450
451 ret = xgene_enet_work_msg(skb, &hopinfo);
452 if (ret)
453 return ret;
454
455 raw_desc->m3 = cpu_to_le64(SET_VAL(HENQNUM, tx_ring->dst_ring_num) |
456 hopinfo);
457
458 len = skb_headlen(skb);
459 hw_len = xgene_enet_encode_len(len);
460
461 dma_addr = dma_map_single(dev, skb->data, len, DMA_TO_DEVICE);
462 if (dma_mapping_error(dev, dma_addr)) {
463 netdev_err(tx_ring->ndev, "DMA mapping error\n");
464 return -EINVAL;
465 }
466
467 /* Hardware expects descriptor in little endian format */
468 raw_desc->m1 = cpu_to_le64(SET_VAL(DATAADDR, dma_addr) |
469 SET_VAL(BUFDATALEN, hw_len) |
470 SET_BIT(COHERENT));
471
472 if (!skb_is_nonlinear(skb))
473 goto out;
474
475 /* scatter gather */
476 nv = 1;
477 exp_desc = (void *)&tx_ring->raw_desc[tail];
478 tail = (tail + 1) & (tx_ring->slots - 1);
479 memset(exp_desc, 0, sizeof(struct xgene_enet_raw_desc));
480
481 nr_frags = skb_shinfo(skb)->nr_frags;
482 for (i = nr_frags; i < 4 ; i++)
483 exp_desc[i ^ 1] = cpu_to_le64(LAST_BUFFER);
484
485 frag_dma_addr = xgene_get_frag_dma_array(tx_ring);
486
487 for (i = 0, fidx = 0; split || (fidx < nr_frags); i++) {
488 if (!split) {
489 frag = &skb_shinfo(skb)->frags[fidx];
490 size = skb_frag_size(frag);
491 offset = 0;
492
493 pbuf_addr = skb_frag_dma_map(dev, frag, 0, size,
494 DMA_TO_DEVICE);
495 if (dma_mapping_error(dev, pbuf_addr))
496 return -EINVAL;
497
498 frag_dma_addr[fidx] = pbuf_addr;
499 fidx++;
500
501 if (size > BUFLEN_16K)
502 split = true;
503 }
504
505 if (size > BUFLEN_16K) {
506 len = BUFLEN_16K;
507 size -= BUFLEN_16K;
508 } else {
509 len = size;
510 split = false;
511 }
512
513 dma_addr = pbuf_addr + offset;
514 hw_len = xgene_enet_encode_len(len);
515
516 switch (i) {
517 case 0:
518 case 1:
519 case 2:
520 xgene_set_addr_len(exp_desc, i, dma_addr, hw_len);
521 break;
522 case 3:
523 if (split || (fidx != nr_frags)) {
524 exp_bufs = xgene_enet_get_exp_bufs(tx_ring);
525 xgene_set_addr_len(exp_bufs, idx, dma_addr,
526 hw_len);
527 idx++;
528 ell_bytes += len;
529 } else {
530 xgene_set_addr_len(exp_desc, i, dma_addr,
531 hw_len);
532 }
533 break;
534 default:
535 xgene_set_addr_len(exp_bufs, idx, dma_addr, hw_len);
536 idx++;
537 ell_bytes += len;
538 break;
539 }
540
541 if (split)
542 offset += BUFLEN_16K;
543 }
544 count++;
545
546 if (idx) {
547 ll = 1;
548 dma_addr = dma_map_single(dev, exp_bufs,
549 sizeof(u64) * MAX_EXP_BUFFS,
550 DMA_TO_DEVICE);
551 if (dma_mapping_error(dev, dma_addr)) {
552 dev_kfree_skb_any(skb);
553 return -EINVAL;
554 }
555 i = ell_bytes >> LL_BYTES_LSB_LEN;
556 exp_desc[2] = cpu_to_le64(SET_VAL(DATAADDR, dma_addr) |
557 SET_VAL(LL_BYTES_MSB, i) |
558 SET_VAL(LL_LEN, idx));
559 raw_desc->m2 = cpu_to_le64(SET_VAL(LL_BYTES_LSB, ell_bytes));
560 }
561
562 out:
563 raw_desc->m0 = cpu_to_le64(SET_VAL(LL, ll) | SET_VAL(NV, nv) |
564 SET_VAL(USERINFO, tx_ring->tail));
565 tx_ring->cp_ring->cp_skb[tx_ring->tail] = skb;
566 pdata->tx_level[tx_ring->cp_ring->index] += count;
567 tx_ring->tail = tail;
568
569 return count;
570 }
571
572 static netdev_tx_t xgene_enet_start_xmit(struct sk_buff *skb,
573 struct net_device *ndev)
574 {
575 struct xgene_enet_pdata *pdata = netdev_priv(ndev);
576 struct xgene_enet_desc_ring *tx_ring;
577 int index = skb->queue_mapping;
578 u32 tx_level = pdata->tx_level[index];
579 int count;
580
581 tx_ring = pdata->tx_ring[index];
582 if (tx_level < pdata->txc_level[index])
583 tx_level += ((typeof(pdata->tx_level[index]))~0U);
584
585 if ((tx_level - pdata->txc_level[index]) > pdata->tx_qcnt_hi) {
586 netif_stop_subqueue(ndev, index);
587 return NETDEV_TX_BUSY;
588 }
589
590 if (skb_padto(skb, XGENE_MIN_ENET_FRAME_SIZE))
591 return NETDEV_TX_OK;
592
593 count = xgene_enet_setup_tx_desc(tx_ring, skb);
594 if (count == -EBUSY)
595 return NETDEV_TX_BUSY;
596
597 if (count <= 0) {
598 dev_kfree_skb_any(skb);
599 return NETDEV_TX_OK;
600 }
601
602 skb_tx_timestamp(skb);
603
604 tx_ring->tx_packets++;
605 tx_ring->tx_bytes += skb->len;
606
607 pdata->ring_ops->wr_cmd(tx_ring, count);
608 return NETDEV_TX_OK;
609 }
610
611 static void xgene_enet_skip_csum(struct sk_buff *skb)
612 {
613 struct iphdr *iph = ip_hdr(skb);
614
615 if (!ip_is_fragment(iph) ||
616 (iph->protocol != IPPROTO_TCP && iph->protocol != IPPROTO_UDP)) {
617 skb->ip_summed = CHECKSUM_UNNECESSARY;
618 }
619 }
620
621 static void xgene_enet_free_pagepool(struct xgene_enet_desc_ring *buf_pool,
622 struct xgene_enet_raw_desc *raw_desc,
623 struct xgene_enet_raw_desc *exp_desc)
624 {
625 __le64 *desc = (void *)exp_desc;
626 dma_addr_t dma_addr;
627 struct device *dev;
628 struct page *page;
629 u16 slots, head;
630 u32 frag_size;
631 int i;
632
633 if (!buf_pool || !raw_desc || !exp_desc ||
634 (!GET_VAL(NV, le64_to_cpu(raw_desc->m0))))
635 return;
636
637 dev = ndev_to_dev(buf_pool->ndev);
638 slots = buf_pool->slots - 1;
639 head = buf_pool->head;
640
641 for (i = 0; i < 4; i++) {
642 frag_size = xgene_enet_get_data_len(le64_to_cpu(desc[i ^ 1]));
643 if (!frag_size)
644 break;
645
646 dma_addr = GET_VAL(DATAADDR, le64_to_cpu(desc[i ^ 1]));
647 dma_unmap_page(dev, dma_addr, PAGE_SIZE, DMA_FROM_DEVICE);
648
649 page = buf_pool->frag_page[head];
650 put_page(page);
651
652 buf_pool->frag_page[head] = NULL;
653 head = (head + 1) & slots;
654 }
655 buf_pool->head = head;
656 }
657
658 static int xgene_enet_rx_frame(struct xgene_enet_desc_ring *rx_ring,
659 struct xgene_enet_raw_desc *raw_desc,
660 struct xgene_enet_raw_desc *exp_desc)
661 {
662 struct xgene_enet_desc_ring *buf_pool, *page_pool;
663 u32 datalen, frag_size, skb_index;
664 struct net_device *ndev;
665 dma_addr_t dma_addr;
666 struct sk_buff *skb;
667 struct device *dev;
668 struct page *page;
669 u16 slots, head;
670 int i, ret = 0;
671 __le64 *desc;
672 u8 status;
673 bool nv;
674
675 ndev = rx_ring->ndev;
676 dev = ndev_to_dev(rx_ring->ndev);
677 buf_pool = rx_ring->buf_pool;
678 page_pool = rx_ring->page_pool;
679
680 dma_unmap_single(dev, GET_VAL(DATAADDR, le64_to_cpu(raw_desc->m1)),
681 XGENE_ENET_STD_MTU, DMA_FROM_DEVICE);
682 skb_index = GET_VAL(USERINFO, le64_to_cpu(raw_desc->m0));
683 skb = buf_pool->rx_skb[skb_index];
684 buf_pool->rx_skb[skb_index] = NULL;
685
686 /* checking for error */
687 status = (GET_VAL(ELERR, le64_to_cpu(raw_desc->m0)) << LERR_LEN) ||
688 GET_VAL(LERR, le64_to_cpu(raw_desc->m0));
689 if (unlikely(status > 2)) {
690 dev_kfree_skb_any(skb);
691 xgene_enet_free_pagepool(page_pool, raw_desc, exp_desc);
692 xgene_enet_parse_error(rx_ring, netdev_priv(rx_ring->ndev),
693 status);
694 ret = -EIO;
695 goto out;
696 }
697
698 /* strip off CRC as HW isn't doing this */
699 datalen = xgene_enet_get_data_len(le64_to_cpu(raw_desc->m1));
700
701 nv = GET_VAL(NV, le64_to_cpu(raw_desc->m0));
702 if (!nv)
703 datalen -= 4;
704
705 skb_put(skb, datalen);
706 prefetch(skb->data - NET_IP_ALIGN);
707
708 if (!nv)
709 goto skip_jumbo;
710
711 slots = page_pool->slots - 1;
712 head = page_pool->head;
713 desc = (void *)exp_desc;
714
715 for (i = 0; i < 4; i++) {
716 frag_size = xgene_enet_get_data_len(le64_to_cpu(desc[i ^ 1]));
717 if (!frag_size)
718 break;
719
720 dma_addr = GET_VAL(DATAADDR, le64_to_cpu(desc[i ^ 1]));
721 dma_unmap_page(dev, dma_addr, PAGE_SIZE, DMA_FROM_DEVICE);
722
723 page = page_pool->frag_page[head];
724 skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, page, 0,
725 frag_size, PAGE_SIZE);
726
727 datalen += frag_size;
728
729 page_pool->frag_page[head] = NULL;
730 head = (head + 1) & slots;
731 }
732
733 page_pool->head = head;
734 rx_ring->npagepool -= skb_shinfo(skb)->nr_frags;
735
736 skip_jumbo:
737 skb_checksum_none_assert(skb);
738 skb->protocol = eth_type_trans(skb, ndev);
739 if (likely((ndev->features & NETIF_F_IP_CSUM) &&
740 skb->protocol == htons(ETH_P_IP))) {
741 xgene_enet_skip_csum(skb);
742 }
743
744 rx_ring->rx_packets++;
745 rx_ring->rx_bytes += datalen;
746 napi_gro_receive(&rx_ring->napi, skb);
747
748 out:
749 if (rx_ring->npagepool <= 0) {
750 ret = xgene_enet_refill_pagepool(page_pool, NUM_NXTBUFPOOL);
751 rx_ring->npagepool = NUM_NXTBUFPOOL;
752 if (ret)
753 return ret;
754 }
755
756 if (--rx_ring->nbufpool == 0) {
757 ret = xgene_enet_refill_bufpool(buf_pool, NUM_BUFPOOL);
758 rx_ring->nbufpool = NUM_BUFPOOL;
759 }
760
761 return ret;
762 }
763
764 static bool is_rx_desc(struct xgene_enet_raw_desc *raw_desc)
765 {
766 return GET_VAL(FPQNUM, le64_to_cpu(raw_desc->m0)) ? true : false;
767 }
768
769 static int xgene_enet_process_ring(struct xgene_enet_desc_ring *ring,
770 int budget)
771 {
772 struct net_device *ndev = ring->ndev;
773 struct xgene_enet_pdata *pdata = netdev_priv(ndev);
774 struct xgene_enet_raw_desc *raw_desc, *exp_desc;
775 u16 head = ring->head;
776 u16 slots = ring->slots - 1;
777 int ret, desc_count, count = 0, processed = 0;
778 bool is_completion;
779
780 do {
781 raw_desc = &ring->raw_desc[head];
782 desc_count = 0;
783 is_completion = false;
784 exp_desc = NULL;
785 if (unlikely(xgene_enet_is_desc_slot_empty(raw_desc)))
786 break;
787
788 /* read fpqnum field after dataaddr field */
789 dma_rmb();
790 if (GET_BIT(NV, le64_to_cpu(raw_desc->m0))) {
791 head = (head + 1) & slots;
792 exp_desc = &ring->raw_desc[head];
793
794 if (unlikely(xgene_enet_is_desc_slot_empty(exp_desc))) {
795 head = (head - 1) & slots;
796 break;
797 }
798 dma_rmb();
799 count++;
800 desc_count++;
801 }
802 if (is_rx_desc(raw_desc)) {
803 ret = xgene_enet_rx_frame(ring, raw_desc, exp_desc);
804 } else {
805 ret = xgene_enet_tx_completion(ring, raw_desc);
806 is_completion = true;
807 }
808 xgene_enet_mark_desc_slot_empty(raw_desc);
809 if (exp_desc)
810 xgene_enet_mark_desc_slot_empty(exp_desc);
811
812 head = (head + 1) & slots;
813 count++;
814 desc_count++;
815 processed++;
816 if (is_completion)
817 pdata->txc_level[ring->index] += desc_count;
818
819 if (ret)
820 break;
821 } while (--budget);
822
823 if (likely(count)) {
824 pdata->ring_ops->wr_cmd(ring, -count);
825 ring->head = head;
826
827 if (__netif_subqueue_stopped(ndev, ring->index))
828 netif_start_subqueue(ndev, ring->index);
829 }
830
831 return processed;
832 }
833
834 static int xgene_enet_napi(struct napi_struct *napi, const int budget)
835 {
836 struct xgene_enet_desc_ring *ring;
837 int processed;
838
839 ring = container_of(napi, struct xgene_enet_desc_ring, napi);
840 processed = xgene_enet_process_ring(ring, budget);
841
842 if (processed != budget) {
843 napi_complete(napi);
844 enable_irq(ring->irq);
845 }
846
847 return processed;
848 }
849
850 static void xgene_enet_timeout(struct net_device *ndev)
851 {
852 struct xgene_enet_pdata *pdata = netdev_priv(ndev);
853 struct netdev_queue *txq;
854 int i;
855
856 pdata->mac_ops->reset(pdata);
857
858 for (i = 0; i < pdata->txq_cnt; i++) {
859 txq = netdev_get_tx_queue(ndev, i);
860 txq->trans_start = jiffies;
861 netif_tx_start_queue(txq);
862 }
863 }
864
865 static void xgene_enet_set_irq_name(struct net_device *ndev)
866 {
867 struct xgene_enet_pdata *pdata = netdev_priv(ndev);
868 struct xgene_enet_desc_ring *ring;
869 int i;
870
871 for (i = 0; i < pdata->rxq_cnt; i++) {
872 ring = pdata->rx_ring[i];
873 if (!pdata->cq_cnt) {
874 snprintf(ring->irq_name, IRQ_ID_SIZE, "%s-rx-txc",
875 ndev->name);
876 } else {
877 snprintf(ring->irq_name, IRQ_ID_SIZE, "%s-rx-%d",
878 ndev->name, i);
879 }
880 }
881
882 for (i = 0; i < pdata->cq_cnt; i++) {
883 ring = pdata->tx_ring[i]->cp_ring;
884 snprintf(ring->irq_name, IRQ_ID_SIZE, "%s-txc-%d",
885 ndev->name, i);
886 }
887 }
888
889 static int xgene_enet_register_irq(struct net_device *ndev)
890 {
891 struct xgene_enet_pdata *pdata = netdev_priv(ndev);
892 struct device *dev = ndev_to_dev(ndev);
893 struct xgene_enet_desc_ring *ring;
894 int ret = 0, i;
895
896 xgene_enet_set_irq_name(ndev);
897 for (i = 0; i < pdata->rxq_cnt; i++) {
898 ring = pdata->rx_ring[i];
899 irq_set_status_flags(ring->irq, IRQ_DISABLE_UNLAZY);
900 ret = devm_request_irq(dev, ring->irq, xgene_enet_rx_irq,
901 0, ring->irq_name, ring);
902 if (ret) {
903 netdev_err(ndev, "Failed to request irq %s\n",
904 ring->irq_name);
905 }
906 }
907
908 for (i = 0; i < pdata->cq_cnt; i++) {
909 ring = pdata->tx_ring[i]->cp_ring;
910 irq_set_status_flags(ring->irq, IRQ_DISABLE_UNLAZY);
911 ret = devm_request_irq(dev, ring->irq, xgene_enet_rx_irq,
912 0, ring->irq_name, ring);
913 if (ret) {
914 netdev_err(ndev, "Failed to request irq %s\n",
915 ring->irq_name);
916 }
917 }
918
919 return ret;
920 }
921
922 static void xgene_enet_free_irq(struct net_device *ndev)
923 {
924 struct xgene_enet_pdata *pdata;
925 struct xgene_enet_desc_ring *ring;
926 struct device *dev;
927 int i;
928
929 pdata = netdev_priv(ndev);
930 dev = ndev_to_dev(ndev);
931
932 for (i = 0; i < pdata->rxq_cnt; i++) {
933 ring = pdata->rx_ring[i];
934 irq_clear_status_flags(ring->irq, IRQ_DISABLE_UNLAZY);
935 devm_free_irq(dev, ring->irq, ring);
936 }
937
938 for (i = 0; i < pdata->cq_cnt; i++) {
939 ring = pdata->tx_ring[i]->cp_ring;
940 irq_clear_status_flags(ring->irq, IRQ_DISABLE_UNLAZY);
941 devm_free_irq(dev, ring->irq, ring);
942 }
943 }
944
945 static void xgene_enet_napi_enable(struct xgene_enet_pdata *pdata)
946 {
947 struct napi_struct *napi;
948 int i;
949
950 for (i = 0; i < pdata->rxq_cnt; i++) {
951 napi = &pdata->rx_ring[i]->napi;
952 napi_enable(napi);
953 }
954
955 for (i = 0; i < pdata->cq_cnt; i++) {
956 napi = &pdata->tx_ring[i]->cp_ring->napi;
957 napi_enable(napi);
958 }
959 }
960
961 static void xgene_enet_napi_disable(struct xgene_enet_pdata *pdata)
962 {
963 struct napi_struct *napi;
964 int i;
965
966 for (i = 0; i < pdata->rxq_cnt; i++) {
967 napi = &pdata->rx_ring[i]->napi;
968 napi_disable(napi);
969 }
970
971 for (i = 0; i < pdata->cq_cnt; i++) {
972 napi = &pdata->tx_ring[i]->cp_ring->napi;
973 napi_disable(napi);
974 }
975 }
976
977 static int xgene_enet_open(struct net_device *ndev)
978 {
979 struct xgene_enet_pdata *pdata = netdev_priv(ndev);
980 const struct xgene_mac_ops *mac_ops = pdata->mac_ops;
981 int ret;
982
983 ret = netif_set_real_num_tx_queues(ndev, pdata->txq_cnt);
984 if (ret)
985 return ret;
986
987 ret = netif_set_real_num_rx_queues(ndev, pdata->rxq_cnt);
988 if (ret)
989 return ret;
990
991 xgene_enet_napi_enable(pdata);
992 ret = xgene_enet_register_irq(ndev);
993 if (ret)
994 return ret;
995
996 if (ndev->phydev) {
997 phy_start(ndev->phydev);
998 } else {
999 schedule_delayed_work(&pdata->link_work, PHY_POLL_LINK_OFF);
1000 netif_carrier_off(ndev);
1001 }
1002
1003 mac_ops->tx_enable(pdata);
1004 mac_ops->rx_enable(pdata);
1005 netif_tx_start_all_queues(ndev);
1006
1007 return ret;
1008 }
1009
1010 static int xgene_enet_close(struct net_device *ndev)
1011 {
1012 struct xgene_enet_pdata *pdata = netdev_priv(ndev);
1013 const struct xgene_mac_ops *mac_ops = pdata->mac_ops;
1014 int i;
1015
1016 netif_tx_stop_all_queues(ndev);
1017 mac_ops->tx_disable(pdata);
1018 mac_ops->rx_disable(pdata);
1019
1020 if (ndev->phydev)
1021 phy_stop(ndev->phydev);
1022 else
1023 cancel_delayed_work_sync(&pdata->link_work);
1024
1025 xgene_enet_free_irq(ndev);
1026 xgene_enet_napi_disable(pdata);
1027 for (i = 0; i < pdata->rxq_cnt; i++)
1028 xgene_enet_process_ring(pdata->rx_ring[i], -1);
1029
1030 return 0;
1031 }
1032 static void xgene_enet_delete_ring(struct xgene_enet_desc_ring *ring)
1033 {
1034 struct xgene_enet_pdata *pdata;
1035 struct device *dev;
1036
1037 pdata = netdev_priv(ring->ndev);
1038 dev = ndev_to_dev(ring->ndev);
1039
1040 pdata->ring_ops->clear(ring);
1041 dmam_free_coherent(dev, ring->size, ring->desc_addr, ring->dma);
1042 }
1043
1044 static void xgene_enet_delete_desc_rings(struct xgene_enet_pdata *pdata)
1045 {
1046 struct xgene_enet_desc_ring *buf_pool, *page_pool;
1047 struct xgene_enet_desc_ring *ring;
1048 int i;
1049
1050 for (i = 0; i < pdata->txq_cnt; i++) {
1051 ring = pdata->tx_ring[i];
1052 if (ring) {
1053 xgene_enet_delete_ring(ring);
1054 pdata->port_ops->clear(pdata, ring);
1055 if (pdata->cq_cnt)
1056 xgene_enet_delete_ring(ring->cp_ring);
1057 pdata->tx_ring[i] = NULL;
1058 }
1059
1060 }
1061
1062 for (i = 0; i < pdata->rxq_cnt; i++) {
1063 ring = pdata->rx_ring[i];
1064 if (ring) {
1065 page_pool = ring->page_pool;
1066 if (page_pool) {
1067 xgene_enet_delete_pagepool(page_pool);
1068 xgene_enet_delete_ring(page_pool);
1069 pdata->port_ops->clear(pdata, page_pool);
1070 }
1071
1072 buf_pool = ring->buf_pool;
1073 xgene_enet_delete_bufpool(buf_pool);
1074 xgene_enet_delete_ring(buf_pool);
1075 pdata->port_ops->clear(pdata, buf_pool);
1076
1077 xgene_enet_delete_ring(ring);
1078 pdata->rx_ring[i] = NULL;
1079 }
1080
1081 }
1082 }
1083
1084 static int xgene_enet_get_ring_size(struct device *dev,
1085 enum xgene_enet_ring_cfgsize cfgsize)
1086 {
1087 int size = -EINVAL;
1088
1089 switch (cfgsize) {
1090 case RING_CFGSIZE_512B:
1091 size = 0x200;
1092 break;
1093 case RING_CFGSIZE_2KB:
1094 size = 0x800;
1095 break;
1096 case RING_CFGSIZE_16KB:
1097 size = 0x4000;
1098 break;
1099 case RING_CFGSIZE_64KB:
1100 size = 0x10000;
1101 break;
1102 case RING_CFGSIZE_512KB:
1103 size = 0x80000;
1104 break;
1105 default:
1106 dev_err(dev, "Unsupported cfg ring size %d\n", cfgsize);
1107 break;
1108 }
1109
1110 return size;
1111 }
1112
1113 static void xgene_enet_free_desc_ring(struct xgene_enet_desc_ring *ring)
1114 {
1115 struct xgene_enet_pdata *pdata;
1116 struct device *dev;
1117
1118 if (!ring)
1119 return;
1120
1121 dev = ndev_to_dev(ring->ndev);
1122 pdata = netdev_priv(ring->ndev);
1123
1124 if (ring->desc_addr) {
1125 pdata->ring_ops->clear(ring);
1126 dmam_free_coherent(dev, ring->size, ring->desc_addr, ring->dma);
1127 }
1128 devm_kfree(dev, ring);
1129 }
1130
1131 static void xgene_enet_free_desc_rings(struct xgene_enet_pdata *pdata)
1132 {
1133 struct xgene_enet_desc_ring *page_pool;
1134 struct device *dev = &pdata->pdev->dev;
1135 struct xgene_enet_desc_ring *ring;
1136 void *p;
1137 int i;
1138
1139 for (i = 0; i < pdata->txq_cnt; i++) {
1140 ring = pdata->tx_ring[i];
1141 if (ring) {
1142 if (ring->cp_ring && ring->cp_ring->cp_skb)
1143 devm_kfree(dev, ring->cp_ring->cp_skb);
1144
1145 if (ring->cp_ring && pdata->cq_cnt)
1146 xgene_enet_free_desc_ring(ring->cp_ring);
1147
1148 xgene_enet_free_desc_ring(ring);
1149 }
1150
1151 }
1152
1153 for (i = 0; i < pdata->rxq_cnt; i++) {
1154 ring = pdata->rx_ring[i];
1155 if (ring) {
1156 if (ring->buf_pool) {
1157 if (ring->buf_pool->rx_skb)
1158 devm_kfree(dev, ring->buf_pool->rx_skb);
1159
1160 xgene_enet_free_desc_ring(ring->buf_pool);
1161 }
1162
1163 page_pool = ring->page_pool;
1164 if (page_pool) {
1165 p = page_pool->frag_page;
1166 if (p)
1167 devm_kfree(dev, p);
1168
1169 p = page_pool->frag_dma_addr;
1170 if (p)
1171 devm_kfree(dev, p);
1172 }
1173
1174 xgene_enet_free_desc_ring(ring);
1175 }
1176 }
1177 }
1178
1179 static bool is_irq_mbox_required(struct xgene_enet_pdata *pdata,
1180 struct xgene_enet_desc_ring *ring)
1181 {
1182 if ((pdata->enet_id == XGENE_ENET2) &&
1183 (xgene_enet_ring_owner(ring->id) == RING_OWNER_CPU)) {
1184 return true;
1185 }
1186
1187 return false;
1188 }
1189
1190 static void __iomem *xgene_enet_ring_cmd_base(struct xgene_enet_pdata *pdata,
1191 struct xgene_enet_desc_ring *ring)
1192 {
1193 u8 num_ring_id_shift = pdata->ring_ops->num_ring_id_shift;
1194
1195 return pdata->ring_cmd_addr + (ring->num << num_ring_id_shift);
1196 }
1197
1198 static struct xgene_enet_desc_ring *xgene_enet_create_desc_ring(
1199 struct net_device *ndev, u32 ring_num,
1200 enum xgene_enet_ring_cfgsize cfgsize, u32 ring_id)
1201 {
1202 struct xgene_enet_pdata *pdata = netdev_priv(ndev);
1203 struct device *dev = ndev_to_dev(ndev);
1204 struct xgene_enet_desc_ring *ring;
1205 void *irq_mbox_addr;
1206 int size;
1207
1208 size = xgene_enet_get_ring_size(dev, cfgsize);
1209 if (size < 0)
1210 return NULL;
1211
1212 ring = devm_kzalloc(dev, sizeof(struct xgene_enet_desc_ring),
1213 GFP_KERNEL);
1214 if (!ring)
1215 return NULL;
1216
1217 ring->ndev = ndev;
1218 ring->num = ring_num;
1219 ring->cfgsize = cfgsize;
1220 ring->id = ring_id;
1221
1222 ring->desc_addr = dmam_alloc_coherent(dev, size, &ring->dma,
1223 GFP_KERNEL | __GFP_ZERO);
1224 if (!ring->desc_addr) {
1225 devm_kfree(dev, ring);
1226 return NULL;
1227 }
1228 ring->size = size;
1229
1230 if (is_irq_mbox_required(pdata, ring)) {
1231 irq_mbox_addr = dmam_alloc_coherent(dev, INTR_MBOX_SIZE,
1232 &ring->irq_mbox_dma,
1233 GFP_KERNEL | __GFP_ZERO);
1234 if (!irq_mbox_addr) {
1235 dmam_free_coherent(dev, size, ring->desc_addr,
1236 ring->dma);
1237 devm_kfree(dev, ring);
1238 return NULL;
1239 }
1240 ring->irq_mbox_addr = irq_mbox_addr;
1241 }
1242
1243 ring->cmd_base = xgene_enet_ring_cmd_base(pdata, ring);
1244 ring->cmd = ring->cmd_base + INC_DEC_CMD_ADDR;
1245 ring = pdata->ring_ops->setup(ring);
1246 netdev_dbg(ndev, "ring info: num=%d size=%d id=%d slots=%d\n",
1247 ring->num, ring->size, ring->id, ring->slots);
1248
1249 return ring;
1250 }
1251
1252 static u16 xgene_enet_get_ring_id(enum xgene_ring_owner owner, u8 bufnum)
1253 {
1254 return (owner << 6) | (bufnum & GENMASK(5, 0));
1255 }
1256
1257 static enum xgene_ring_owner xgene_derive_ring_owner(struct xgene_enet_pdata *p)
1258 {
1259 enum xgene_ring_owner owner;
1260
1261 if (p->enet_id == XGENE_ENET1) {
1262 switch (p->phy_mode) {
1263 case PHY_INTERFACE_MODE_SGMII:
1264 owner = RING_OWNER_ETH0;
1265 break;
1266 default:
1267 owner = (!p->port_id) ? RING_OWNER_ETH0 :
1268 RING_OWNER_ETH1;
1269 break;
1270 }
1271 } else {
1272 owner = (!p->port_id) ? RING_OWNER_ETH0 : RING_OWNER_ETH1;
1273 }
1274
1275 return owner;
1276 }
1277
1278 static u8 xgene_start_cpu_bufnum(struct xgene_enet_pdata *pdata)
1279 {
1280 struct device *dev = &pdata->pdev->dev;
1281 u32 cpu_bufnum;
1282 int ret;
1283
1284 ret = device_property_read_u32(dev, "channel", &cpu_bufnum);
1285
1286 return (!ret) ? cpu_bufnum : pdata->cpu_bufnum;
1287 }
1288
1289 static int xgene_enet_create_desc_rings(struct net_device *ndev)
1290 {
1291 struct xgene_enet_desc_ring *rx_ring, *tx_ring, *cp_ring;
1292 struct xgene_enet_pdata *pdata = netdev_priv(ndev);
1293 struct xgene_enet_desc_ring *page_pool = NULL;
1294 struct xgene_enet_desc_ring *buf_pool = NULL;
1295 struct device *dev = ndev_to_dev(ndev);
1296 u8 eth_bufnum = pdata->eth_bufnum;
1297 u8 bp_bufnum = pdata->bp_bufnum;
1298 u16 ring_num = pdata->ring_num;
1299 enum xgene_ring_owner owner;
1300 dma_addr_t dma_exp_bufs;
1301 u16 ring_id, slots;
1302 __le64 *exp_bufs;
1303 int i, ret, size;
1304 u8 cpu_bufnum;
1305
1306 cpu_bufnum = xgene_start_cpu_bufnum(pdata);
1307
1308 for (i = 0; i < pdata->rxq_cnt; i++) {
1309 /* allocate rx descriptor ring */
1310 owner = xgene_derive_ring_owner(pdata);
1311 ring_id = xgene_enet_get_ring_id(RING_OWNER_CPU, cpu_bufnum++);
1312 rx_ring = xgene_enet_create_desc_ring(ndev, ring_num++,
1313 RING_CFGSIZE_16KB,
1314 ring_id);
1315 if (!rx_ring) {
1316 ret = -ENOMEM;
1317 goto err;
1318 }
1319
1320 /* allocate buffer pool for receiving packets */
1321 owner = xgene_derive_ring_owner(pdata);
1322 ring_id = xgene_enet_get_ring_id(owner, bp_bufnum++);
1323 buf_pool = xgene_enet_create_desc_ring(ndev, ring_num++,
1324 RING_CFGSIZE_16KB,
1325 ring_id);
1326 if (!buf_pool) {
1327 ret = -ENOMEM;
1328 goto err;
1329 }
1330
1331 rx_ring->nbufpool = NUM_BUFPOOL;
1332 rx_ring->npagepool = NUM_NXTBUFPOOL;
1333 rx_ring->irq = pdata->irqs[i];
1334 buf_pool->rx_skb = devm_kcalloc(dev, buf_pool->slots,
1335 sizeof(struct sk_buff *),
1336 GFP_KERNEL);
1337 if (!buf_pool->rx_skb) {
1338 ret = -ENOMEM;
1339 goto err;
1340 }
1341
1342 buf_pool->dst_ring_num = xgene_enet_dst_ring_num(buf_pool);
1343 rx_ring->buf_pool = buf_pool;
1344 pdata->rx_ring[i] = rx_ring;
1345
1346 if ((pdata->enet_id == XGENE_ENET1 && pdata->rxq_cnt > 4) ||
1347 (pdata->enet_id == XGENE_ENET2 && pdata->rxq_cnt > 16)) {
1348 break;
1349 }
1350
1351 /* allocate next buffer pool for jumbo packets */
1352 owner = xgene_derive_ring_owner(pdata);
1353 ring_id = xgene_enet_get_ring_id(owner, bp_bufnum++);
1354 page_pool = xgene_enet_create_desc_ring(ndev, ring_num++,
1355 RING_CFGSIZE_16KB,
1356 ring_id);
1357 if (!page_pool) {
1358 ret = -ENOMEM;
1359 goto err;
1360 }
1361
1362 slots = page_pool->slots;
1363 page_pool->frag_page = devm_kcalloc(dev, slots,
1364 sizeof(struct page *),
1365 GFP_KERNEL);
1366 if (!page_pool->frag_page) {
1367 ret = -ENOMEM;
1368 goto err;
1369 }
1370
1371 page_pool->frag_dma_addr = devm_kcalloc(dev, slots,
1372 sizeof(dma_addr_t),
1373 GFP_KERNEL);
1374 if (!page_pool->frag_dma_addr) {
1375 ret = -ENOMEM;
1376 goto err;
1377 }
1378
1379 page_pool->dst_ring_num = xgene_enet_dst_ring_num(page_pool);
1380 rx_ring->page_pool = page_pool;
1381 }
1382
1383 for (i = 0; i < pdata->txq_cnt; i++) {
1384 /* allocate tx descriptor ring */
1385 owner = xgene_derive_ring_owner(pdata);
1386 ring_id = xgene_enet_get_ring_id(owner, eth_bufnum++);
1387 tx_ring = xgene_enet_create_desc_ring(ndev, ring_num++,
1388 RING_CFGSIZE_16KB,
1389 ring_id);
1390 if (!tx_ring) {
1391 ret = -ENOMEM;
1392 goto err;
1393 }
1394
1395 size = (tx_ring->slots / 2) * sizeof(__le64) * MAX_EXP_BUFFS;
1396 exp_bufs = dmam_alloc_coherent(dev, size, &dma_exp_bufs,
1397 GFP_KERNEL | __GFP_ZERO);
1398 if (!exp_bufs) {
1399 ret = -ENOMEM;
1400 goto err;
1401 }
1402 tx_ring->exp_bufs = exp_bufs;
1403
1404 pdata->tx_ring[i] = tx_ring;
1405
1406 if (!pdata->cq_cnt) {
1407 cp_ring = pdata->rx_ring[i];
1408 } else {
1409 /* allocate tx completion descriptor ring */
1410 ring_id = xgene_enet_get_ring_id(RING_OWNER_CPU,
1411 cpu_bufnum++);
1412 cp_ring = xgene_enet_create_desc_ring(ndev, ring_num++,
1413 RING_CFGSIZE_16KB,
1414 ring_id);
1415 if (!cp_ring) {
1416 ret = -ENOMEM;
1417 goto err;
1418 }
1419
1420 cp_ring->irq = pdata->irqs[pdata->rxq_cnt + i];
1421 cp_ring->index = i;
1422 }
1423
1424 cp_ring->cp_skb = devm_kcalloc(dev, tx_ring->slots,
1425 sizeof(struct sk_buff *),
1426 GFP_KERNEL);
1427 if (!cp_ring->cp_skb) {
1428 ret = -ENOMEM;
1429 goto err;
1430 }
1431
1432 size = sizeof(dma_addr_t) * MAX_SKB_FRAGS;
1433 cp_ring->frag_dma_addr = devm_kcalloc(dev, tx_ring->slots,
1434 size, GFP_KERNEL);
1435 if (!cp_ring->frag_dma_addr) {
1436 devm_kfree(dev, cp_ring->cp_skb);
1437 ret = -ENOMEM;
1438 goto err;
1439 }
1440
1441 tx_ring->cp_ring = cp_ring;
1442 tx_ring->dst_ring_num = xgene_enet_dst_ring_num(cp_ring);
1443 }
1444
1445 if (pdata->ring_ops->coalesce)
1446 pdata->ring_ops->coalesce(pdata->tx_ring[0]);
1447 pdata->tx_qcnt_hi = pdata->tx_ring[0]->slots - 128;
1448
1449 return 0;
1450
1451 err:
1452 xgene_enet_free_desc_rings(pdata);
1453 return ret;
1454 }
1455
1456 static struct rtnl_link_stats64 *xgene_enet_get_stats64(
1457 struct net_device *ndev,
1458 struct rtnl_link_stats64 *storage)
1459 {
1460 struct xgene_enet_pdata *pdata = netdev_priv(ndev);
1461 struct rtnl_link_stats64 *stats = &pdata->stats;
1462 struct xgene_enet_desc_ring *ring;
1463 int i;
1464
1465 memset(stats, 0, sizeof(struct rtnl_link_stats64));
1466 for (i = 0; i < pdata->txq_cnt; i++) {
1467 ring = pdata->tx_ring[i];
1468 if (ring) {
1469 stats->tx_packets += ring->tx_packets;
1470 stats->tx_bytes += ring->tx_bytes;
1471 }
1472 }
1473
1474 for (i = 0; i < pdata->rxq_cnt; i++) {
1475 ring = pdata->rx_ring[i];
1476 if (ring) {
1477 stats->rx_packets += ring->rx_packets;
1478 stats->rx_bytes += ring->rx_bytes;
1479 stats->rx_errors += ring->rx_length_errors +
1480 ring->rx_crc_errors +
1481 ring->rx_frame_errors +
1482 ring->rx_fifo_errors;
1483 stats->rx_dropped += ring->rx_dropped;
1484 }
1485 }
1486 memcpy(storage, stats, sizeof(struct rtnl_link_stats64));
1487
1488 return storage;
1489 }
1490
1491 static int xgene_enet_set_mac_address(struct net_device *ndev, void *addr)
1492 {
1493 struct xgene_enet_pdata *pdata = netdev_priv(ndev);
1494 int ret;
1495
1496 ret = eth_mac_addr(ndev, addr);
1497 if (ret)
1498 return ret;
1499 pdata->mac_ops->set_mac_addr(pdata);
1500
1501 return ret;
1502 }
1503
1504 static int xgene_change_mtu(struct net_device *ndev, int new_mtu)
1505 {
1506 struct xgene_enet_pdata *pdata = netdev_priv(ndev);
1507 int frame_size;
1508
1509 if (!netif_running(ndev))
1510 return 0;
1511
1512 frame_size = (new_mtu > ETH_DATA_LEN) ? (new_mtu + 18) : 0x600;
1513
1514 xgene_enet_close(ndev);
1515 ndev->mtu = new_mtu;
1516 pdata->mac_ops->set_framesize(pdata, frame_size);
1517 xgene_enet_open(ndev);
1518
1519 return 0;
1520 }
1521
1522 static const struct net_device_ops xgene_ndev_ops = {
1523 .ndo_open = xgene_enet_open,
1524 .ndo_stop = xgene_enet_close,
1525 .ndo_start_xmit = xgene_enet_start_xmit,
1526 .ndo_tx_timeout = xgene_enet_timeout,
1527 .ndo_get_stats64 = xgene_enet_get_stats64,
1528 .ndo_change_mtu = xgene_change_mtu,
1529 .ndo_set_mac_address = xgene_enet_set_mac_address,
1530 };
1531
1532 #ifdef CONFIG_ACPI
1533 static void xgene_get_port_id_acpi(struct device *dev,
1534 struct xgene_enet_pdata *pdata)
1535 {
1536 acpi_status status;
1537 u64 temp;
1538
1539 status = acpi_evaluate_integer(ACPI_HANDLE(dev), "_SUN", NULL, &temp);
1540 if (ACPI_FAILURE(status)) {
1541 pdata->port_id = 0;
1542 } else {
1543 pdata->port_id = temp;
1544 }
1545
1546 return;
1547 }
1548 #endif
1549
1550 static void xgene_get_port_id_dt(struct device *dev, struct xgene_enet_pdata *pdata)
1551 {
1552 u32 id = 0;
1553
1554 of_property_read_u32(dev->of_node, "port-id", &id);
1555
1556 pdata->port_id = id & BIT(0);
1557
1558 return;
1559 }
1560
1561 static int xgene_get_tx_delay(struct xgene_enet_pdata *pdata)
1562 {
1563 struct device *dev = &pdata->pdev->dev;
1564 int delay, ret;
1565
1566 ret = of_property_read_u32(dev->of_node, "tx-delay", &delay);
1567 if (ret) {
1568 pdata->tx_delay = 4;
1569 return 0;
1570 }
1571
1572 if (delay < 0 || delay > 7) {
1573 dev_err(dev, "Invalid tx-delay specified\n");
1574 return -EINVAL;
1575 }
1576
1577 pdata->tx_delay = delay;
1578
1579 return 0;
1580 }
1581
1582 static int xgene_get_rx_delay(struct xgene_enet_pdata *pdata)
1583 {
1584 struct device *dev = &pdata->pdev->dev;
1585 int delay, ret;
1586
1587 ret = of_property_read_u32(dev->of_node, "rx-delay", &delay);
1588 if (ret) {
1589 pdata->rx_delay = 2;
1590 return 0;
1591 }
1592
1593 if (delay < 0 || delay > 7) {
1594 dev_err(dev, "Invalid rx-delay specified\n");
1595 return -EINVAL;
1596 }
1597
1598 pdata->rx_delay = delay;
1599
1600 return 0;
1601 }
1602
1603 static int xgene_enet_get_irqs(struct xgene_enet_pdata *pdata)
1604 {
1605 struct platform_device *pdev = pdata->pdev;
1606 struct device *dev = &pdev->dev;
1607 int i, ret, max_irqs;
1608
1609 if (pdata->phy_mode == PHY_INTERFACE_MODE_RGMII)
1610 max_irqs = 1;
1611 else if (pdata->phy_mode == PHY_INTERFACE_MODE_SGMII)
1612 max_irqs = 2;
1613 else
1614 max_irqs = XGENE_MAX_ENET_IRQ;
1615
1616 for (i = 0; i < max_irqs; i++) {
1617 ret = platform_get_irq(pdev, i);
1618 if (ret <= 0) {
1619 if (pdata->phy_mode == PHY_INTERFACE_MODE_XGMII) {
1620 max_irqs = i;
1621 pdata->rxq_cnt = max_irqs / 2;
1622 pdata->txq_cnt = max_irqs / 2;
1623 pdata->cq_cnt = max_irqs / 2;
1624 break;
1625 }
1626 dev_err(dev, "Unable to get ENET IRQ\n");
1627 ret = ret ? : -ENXIO;
1628 return ret;
1629 }
1630 pdata->irqs[i] = ret;
1631 }
1632
1633 return 0;
1634 }
1635
1636 static int xgene_enet_check_phy_handle(struct xgene_enet_pdata *pdata)
1637 {
1638 int ret;
1639
1640 if (pdata->phy_mode == PHY_INTERFACE_MODE_XGMII)
1641 return 0;
1642
1643 if (!IS_ENABLED(CONFIG_MDIO_XGENE))
1644 return 0;
1645
1646 ret = xgene_enet_phy_connect(pdata->ndev);
1647 if (!ret)
1648 pdata->mdio_driver = true;
1649
1650 return 0;
1651 }
1652
1653 static void xgene_enet_gpiod_get(struct xgene_enet_pdata *pdata)
1654 {
1655 struct device *dev = &pdata->pdev->dev;
1656
1657 pdata->sfp_gpio_en = false;
1658 if (pdata->phy_mode != PHY_INTERFACE_MODE_XGMII ||
1659 (!device_property_present(dev, "sfp-gpios") &&
1660 !device_property_present(dev, "rxlos-gpios")))
1661 return;
1662
1663 pdata->sfp_gpio_en = true;
1664 pdata->sfp_rdy = gpiod_get(dev, "rxlos", GPIOD_IN);
1665 if (IS_ERR(pdata->sfp_rdy))
1666 pdata->sfp_rdy = gpiod_get(dev, "sfp", GPIOD_IN);
1667 }
1668
1669 static int xgene_enet_get_resources(struct xgene_enet_pdata *pdata)
1670 {
1671 struct platform_device *pdev;
1672 struct net_device *ndev;
1673 struct device *dev;
1674 struct resource *res;
1675 void __iomem *base_addr;
1676 u32 offset;
1677 int ret = 0;
1678
1679 pdev = pdata->pdev;
1680 dev = &pdev->dev;
1681 ndev = pdata->ndev;
1682
1683 res = platform_get_resource(pdev, IORESOURCE_MEM, RES_ENET_CSR);
1684 if (!res) {
1685 dev_err(dev, "Resource enet_csr not defined\n");
1686 return -ENODEV;
1687 }
1688 pdata->base_addr = devm_ioremap(dev, res->start, resource_size(res));
1689 if (!pdata->base_addr) {
1690 dev_err(dev, "Unable to retrieve ENET Port CSR region\n");
1691 return -ENOMEM;
1692 }
1693
1694 res = platform_get_resource(pdev, IORESOURCE_MEM, RES_RING_CSR);
1695 if (!res) {
1696 dev_err(dev, "Resource ring_csr not defined\n");
1697 return -ENODEV;
1698 }
1699 pdata->ring_csr_addr = devm_ioremap(dev, res->start,
1700 resource_size(res));
1701 if (!pdata->ring_csr_addr) {
1702 dev_err(dev, "Unable to retrieve ENET Ring CSR region\n");
1703 return -ENOMEM;
1704 }
1705
1706 res = platform_get_resource(pdev, IORESOURCE_MEM, RES_RING_CMD);
1707 if (!res) {
1708 dev_err(dev, "Resource ring_cmd not defined\n");
1709 return -ENODEV;
1710 }
1711 pdata->ring_cmd_addr = devm_ioremap(dev, res->start,
1712 resource_size(res));
1713 if (!pdata->ring_cmd_addr) {
1714 dev_err(dev, "Unable to retrieve ENET Ring command region\n");
1715 return -ENOMEM;
1716 }
1717
1718 if (dev->of_node)
1719 xgene_get_port_id_dt(dev, pdata);
1720 #ifdef CONFIG_ACPI
1721 else
1722 xgene_get_port_id_acpi(dev, pdata);
1723 #endif
1724
1725 if (!device_get_mac_address(dev, ndev->dev_addr, ETH_ALEN))
1726 eth_hw_addr_random(ndev);
1727
1728 memcpy(ndev->perm_addr, ndev->dev_addr, ndev->addr_len);
1729
1730 pdata->phy_mode = device_get_phy_mode(dev);
1731 if (pdata->phy_mode < 0) {
1732 dev_err(dev, "Unable to get phy-connection-type\n");
1733 return pdata->phy_mode;
1734 }
1735 if (pdata->phy_mode != PHY_INTERFACE_MODE_RGMII &&
1736 pdata->phy_mode != PHY_INTERFACE_MODE_SGMII &&
1737 pdata->phy_mode != PHY_INTERFACE_MODE_XGMII) {
1738 dev_err(dev, "Incorrect phy-connection-type specified\n");
1739 return -ENODEV;
1740 }
1741
1742 ret = xgene_get_tx_delay(pdata);
1743 if (ret)
1744 return ret;
1745
1746 ret = xgene_get_rx_delay(pdata);
1747 if (ret)
1748 return ret;
1749
1750 ret = xgene_enet_get_irqs(pdata);
1751 if (ret)
1752 return ret;
1753
1754 ret = xgene_enet_check_phy_handle(pdata);
1755 if (ret)
1756 return ret;
1757
1758 xgene_enet_gpiod_get(pdata);
1759
1760 pdata->clk = devm_clk_get(&pdev->dev, NULL);
1761 if (IS_ERR(pdata->clk)) {
1762 /* Firmware may have set up the clock already. */
1763 dev_info(dev, "clocks have been setup already\n");
1764 }
1765
1766 if (pdata->phy_mode != PHY_INTERFACE_MODE_XGMII)
1767 base_addr = pdata->base_addr - (pdata->port_id * MAC_OFFSET);
1768 else
1769 base_addr = pdata->base_addr;
1770 pdata->eth_csr_addr = base_addr + BLOCK_ETH_CSR_OFFSET;
1771 pdata->cle.base = base_addr + BLOCK_ETH_CLE_CSR_OFFSET;
1772 pdata->eth_ring_if_addr = base_addr + BLOCK_ETH_RING_IF_OFFSET;
1773 pdata->eth_diag_csr_addr = base_addr + BLOCK_ETH_DIAG_CSR_OFFSET;
1774 if (pdata->phy_mode == PHY_INTERFACE_MODE_RGMII ||
1775 pdata->phy_mode == PHY_INTERFACE_MODE_SGMII) {
1776 pdata->mcx_mac_addr = pdata->base_addr + BLOCK_ETH_MAC_OFFSET;
1777 offset = (pdata->enet_id == XGENE_ENET1) ?
1778 BLOCK_ETH_MAC_CSR_OFFSET :
1779 X2_BLOCK_ETH_MAC_CSR_OFFSET;
1780 pdata->mcx_mac_csr_addr = base_addr + offset;
1781 } else {
1782 pdata->mcx_mac_addr = base_addr + BLOCK_AXG_MAC_OFFSET;
1783 pdata->mcx_mac_csr_addr = base_addr + BLOCK_AXG_MAC_CSR_OFFSET;
1784 pdata->pcs_addr = base_addr + BLOCK_PCS_OFFSET;
1785 }
1786 pdata->rx_buff_cnt = NUM_PKT_BUF;
1787
1788 return 0;
1789 }
1790
1791 static int xgene_enet_init_hw(struct xgene_enet_pdata *pdata)
1792 {
1793 struct xgene_enet_cle *enet_cle = &pdata->cle;
1794 struct xgene_enet_desc_ring *page_pool;
1795 struct net_device *ndev = pdata->ndev;
1796 struct xgene_enet_desc_ring *buf_pool;
1797 u16 dst_ring_num, ring_id;
1798 int i, ret;
1799 u32 count;
1800
1801 ret = pdata->port_ops->reset(pdata);
1802 if (ret)
1803 return ret;
1804
1805 ret = xgene_enet_create_desc_rings(ndev);
1806 if (ret) {
1807 netdev_err(ndev, "Error in ring configuration\n");
1808 return ret;
1809 }
1810
1811 /* setup buffer pool */
1812 for (i = 0; i < pdata->rxq_cnt; i++) {
1813 buf_pool = pdata->rx_ring[i]->buf_pool;
1814 xgene_enet_init_bufpool(buf_pool);
1815 page_pool = pdata->rx_ring[i]->page_pool;
1816 xgene_enet_init_bufpool(page_pool);
1817
1818 count = pdata->rx_buff_cnt;
1819 ret = xgene_enet_refill_bufpool(buf_pool, count);
1820 if (ret)
1821 goto err;
1822
1823 ret = xgene_enet_refill_pagepool(page_pool, count);
1824 if (ret)
1825 goto err;
1826
1827 }
1828
1829 dst_ring_num = xgene_enet_dst_ring_num(pdata->rx_ring[0]);
1830 buf_pool = pdata->rx_ring[0]->buf_pool;
1831 if (pdata->phy_mode == PHY_INTERFACE_MODE_XGMII) {
1832 /* Initialize and Enable PreClassifier Tree */
1833 enet_cle->max_nodes = 512;
1834 enet_cle->max_dbptrs = 1024;
1835 enet_cle->parsers = 3;
1836 enet_cle->active_parser = PARSER_ALL;
1837 enet_cle->ptree.start_node = 0;
1838 enet_cle->ptree.start_dbptr = 0;
1839 enet_cle->jump_bytes = 8;
1840 ret = pdata->cle_ops->cle_init(pdata);
1841 if (ret) {
1842 netdev_err(ndev, "Preclass Tree init error\n");
1843 goto err;
1844 }
1845
1846 } else {
1847 dst_ring_num = xgene_enet_dst_ring_num(pdata->rx_ring[0]);
1848 buf_pool = pdata->rx_ring[0]->buf_pool;
1849 page_pool = pdata->rx_ring[0]->page_pool;
1850 ring_id = (page_pool) ? page_pool->id : 0;
1851 pdata->port_ops->cle_bypass(pdata, dst_ring_num,
1852 buf_pool->id, ring_id);
1853 }
1854
1855 ndev->max_mtu = XGENE_ENET_MAX_MTU;
1856 pdata->phy_speed = SPEED_UNKNOWN;
1857 pdata->mac_ops->init(pdata);
1858
1859 return ret;
1860
1861 err:
1862 xgene_enet_delete_desc_rings(pdata);
1863 return ret;
1864 }
1865
1866 static void xgene_enet_setup_ops(struct xgene_enet_pdata *pdata)
1867 {
1868 switch (pdata->phy_mode) {
1869 case PHY_INTERFACE_MODE_RGMII:
1870 pdata->mac_ops = &xgene_gmac_ops;
1871 pdata->port_ops = &xgene_gport_ops;
1872 pdata->rm = RM3;
1873 pdata->rxq_cnt = 1;
1874 pdata->txq_cnt = 1;
1875 pdata->cq_cnt = 0;
1876 break;
1877 case PHY_INTERFACE_MODE_SGMII:
1878 pdata->mac_ops = &xgene_sgmac_ops;
1879 pdata->port_ops = &xgene_sgport_ops;
1880 pdata->rm = RM1;
1881 pdata->rxq_cnt = 1;
1882 pdata->txq_cnt = 1;
1883 pdata->cq_cnt = 1;
1884 break;
1885 default:
1886 pdata->mac_ops = &xgene_xgmac_ops;
1887 pdata->port_ops = &xgene_xgport_ops;
1888 pdata->cle_ops = &xgene_cle3in_ops;
1889 pdata->rm = RM0;
1890 if (!pdata->rxq_cnt) {
1891 pdata->rxq_cnt = XGENE_NUM_RX_RING;
1892 pdata->txq_cnt = XGENE_NUM_TX_RING;
1893 pdata->cq_cnt = XGENE_NUM_TXC_RING;
1894 }
1895 break;
1896 }
1897
1898 if (pdata->enet_id == XGENE_ENET1) {
1899 switch (pdata->port_id) {
1900 case 0:
1901 if (pdata->phy_mode == PHY_INTERFACE_MODE_XGMII) {
1902 pdata->cpu_bufnum = X2_START_CPU_BUFNUM_0;
1903 pdata->eth_bufnum = X2_START_ETH_BUFNUM_0;
1904 pdata->bp_bufnum = X2_START_BP_BUFNUM_0;
1905 pdata->ring_num = START_RING_NUM_0;
1906 } else {
1907 pdata->cpu_bufnum = START_CPU_BUFNUM_0;
1908 pdata->eth_bufnum = START_ETH_BUFNUM_0;
1909 pdata->bp_bufnum = START_BP_BUFNUM_0;
1910 pdata->ring_num = START_RING_NUM_0;
1911 }
1912 break;
1913 case 1:
1914 if (pdata->phy_mode == PHY_INTERFACE_MODE_XGMII) {
1915 pdata->cpu_bufnum = XG_START_CPU_BUFNUM_1;
1916 pdata->eth_bufnum = XG_START_ETH_BUFNUM_1;
1917 pdata->bp_bufnum = XG_START_BP_BUFNUM_1;
1918 pdata->ring_num = XG_START_RING_NUM_1;
1919 } else {
1920 pdata->cpu_bufnum = START_CPU_BUFNUM_1;
1921 pdata->eth_bufnum = START_ETH_BUFNUM_1;
1922 pdata->bp_bufnum = START_BP_BUFNUM_1;
1923 pdata->ring_num = START_RING_NUM_1;
1924 }
1925 break;
1926 default:
1927 break;
1928 }
1929 pdata->ring_ops = &xgene_ring1_ops;
1930 } else {
1931 switch (pdata->port_id) {
1932 case 0:
1933 pdata->cpu_bufnum = X2_START_CPU_BUFNUM_0;
1934 pdata->eth_bufnum = X2_START_ETH_BUFNUM_0;
1935 pdata->bp_bufnum = X2_START_BP_BUFNUM_0;
1936 pdata->ring_num = X2_START_RING_NUM_0;
1937 break;
1938 case 1:
1939 pdata->cpu_bufnum = X2_START_CPU_BUFNUM_1;
1940 pdata->eth_bufnum = X2_START_ETH_BUFNUM_1;
1941 pdata->bp_bufnum = X2_START_BP_BUFNUM_1;
1942 pdata->ring_num = X2_START_RING_NUM_1;
1943 break;
1944 default:
1945 break;
1946 }
1947 pdata->rm = RM0;
1948 pdata->ring_ops = &xgene_ring2_ops;
1949 }
1950 }
1951
1952 static void xgene_enet_napi_add(struct xgene_enet_pdata *pdata)
1953 {
1954 struct napi_struct *napi;
1955 int i;
1956
1957 for (i = 0; i < pdata->rxq_cnt; i++) {
1958 napi = &pdata->rx_ring[i]->napi;
1959 netif_napi_add(pdata->ndev, napi, xgene_enet_napi,
1960 NAPI_POLL_WEIGHT);
1961 }
1962
1963 for (i = 0; i < pdata->cq_cnt; i++) {
1964 napi = &pdata->tx_ring[i]->cp_ring->napi;
1965 netif_napi_add(pdata->ndev, napi, xgene_enet_napi,
1966 NAPI_POLL_WEIGHT);
1967 }
1968 }
1969
1970 static int xgene_enet_probe(struct platform_device *pdev)
1971 {
1972 struct net_device *ndev;
1973 struct xgene_enet_pdata *pdata;
1974 struct device *dev = &pdev->dev;
1975 void (*link_state)(struct work_struct *);
1976 const struct of_device_id *of_id;
1977 int ret;
1978
1979 ndev = alloc_etherdev_mqs(sizeof(struct xgene_enet_pdata),
1980 XGENE_NUM_RX_RING, XGENE_NUM_TX_RING);
1981 if (!ndev)
1982 return -ENOMEM;
1983
1984 pdata = netdev_priv(ndev);
1985
1986 pdata->pdev = pdev;
1987 pdata->ndev = ndev;
1988 SET_NETDEV_DEV(ndev, dev);
1989 platform_set_drvdata(pdev, pdata);
1990 ndev->netdev_ops = &xgene_ndev_ops;
1991 xgene_enet_set_ethtool_ops(ndev);
1992 ndev->features |= NETIF_F_IP_CSUM |
1993 NETIF_F_GSO |
1994 NETIF_F_GRO |
1995 NETIF_F_SG;
1996
1997 of_id = of_match_device(xgene_enet_of_match, &pdev->dev);
1998 if (of_id) {
1999 pdata->enet_id = (enum xgene_enet_id)of_id->data;
2000 }
2001 #ifdef CONFIG_ACPI
2002 else {
2003 const struct acpi_device_id *acpi_id;
2004
2005 acpi_id = acpi_match_device(xgene_enet_acpi_match, &pdev->dev);
2006 if (acpi_id)
2007 pdata->enet_id = (enum xgene_enet_id) acpi_id->driver_data;
2008 }
2009 #endif
2010 if (!pdata->enet_id) {
2011 ret = -ENODEV;
2012 goto err;
2013 }
2014
2015 ret = xgene_enet_get_resources(pdata);
2016 if (ret)
2017 goto err;
2018
2019 xgene_enet_setup_ops(pdata);
2020
2021 if (pdata->phy_mode == PHY_INTERFACE_MODE_XGMII) {
2022 ndev->features |= NETIF_F_TSO;
2023 spin_lock_init(&pdata->mss_lock);
2024 }
2025 ndev->hw_features = ndev->features;
2026
2027 ret = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(64));
2028 if (ret) {
2029 netdev_err(ndev, "No usable DMA configuration\n");
2030 goto err;
2031 }
2032
2033 ret = xgene_enet_init_hw(pdata);
2034 if (ret)
2035 goto err;
2036
2037 link_state = pdata->mac_ops->link_state;
2038 if (pdata->phy_mode == PHY_INTERFACE_MODE_XGMII) {
2039 INIT_DELAYED_WORK(&pdata->link_work, link_state);
2040 } else if (!pdata->mdio_driver) {
2041 if (pdata->phy_mode == PHY_INTERFACE_MODE_RGMII)
2042 ret = xgene_enet_mdio_config(pdata);
2043 else
2044 INIT_DELAYED_WORK(&pdata->link_work, link_state);
2045
2046 if (ret)
2047 goto err1;
2048 }
2049
2050 xgene_enet_napi_add(pdata);
2051 ret = register_netdev(ndev);
2052 if (ret) {
2053 netdev_err(ndev, "Failed to register netdev\n");
2054 goto err2;
2055 }
2056
2057 return 0;
2058
2059 err2:
2060 /*
2061 * If necessary, free_netdev() will call netif_napi_del() and undo
2062 * the effects of xgene_enet_napi_add()'s calls to netif_napi_add().
2063 */
2064
2065 if (pdata->mdio_driver)
2066 xgene_enet_phy_disconnect(pdata);
2067 else if (pdata->phy_mode == PHY_INTERFACE_MODE_RGMII)
2068 xgene_enet_mdio_remove(pdata);
2069 err1:
2070 xgene_enet_delete_desc_rings(pdata);
2071 err:
2072 free_netdev(ndev);
2073 return ret;
2074 }
2075
2076 static int xgene_enet_remove(struct platform_device *pdev)
2077 {
2078 struct xgene_enet_pdata *pdata;
2079 struct net_device *ndev;
2080
2081 pdata = platform_get_drvdata(pdev);
2082 ndev = pdata->ndev;
2083
2084 rtnl_lock();
2085 if (netif_running(ndev))
2086 dev_close(ndev);
2087 rtnl_unlock();
2088
2089 if (pdata->mdio_driver)
2090 xgene_enet_phy_disconnect(pdata);
2091 else if (pdata->phy_mode == PHY_INTERFACE_MODE_RGMII)
2092 xgene_enet_mdio_remove(pdata);
2093
2094 unregister_netdev(ndev);
2095 xgene_enet_delete_desc_rings(pdata);
2096 pdata->port_ops->shutdown(pdata);
2097 free_netdev(ndev);
2098
2099 return 0;
2100 }
2101
2102 static void xgene_enet_shutdown(struct platform_device *pdev)
2103 {
2104 struct xgene_enet_pdata *pdata;
2105
2106 pdata = platform_get_drvdata(pdev);
2107 if (!pdata)
2108 return;
2109
2110 if (!pdata->ndev)
2111 return;
2112
2113 xgene_enet_remove(pdev);
2114 }
2115
2116 #ifdef CONFIG_ACPI
2117 static const struct acpi_device_id xgene_enet_acpi_match[] = {
2118 { "APMC0D05", XGENE_ENET1},
2119 { "APMC0D30", XGENE_ENET1},
2120 { "APMC0D31", XGENE_ENET1},
2121 { "APMC0D3F", XGENE_ENET1},
2122 { "APMC0D26", XGENE_ENET2},
2123 { "APMC0D25", XGENE_ENET2},
2124 { }
2125 };
2126 MODULE_DEVICE_TABLE(acpi, xgene_enet_acpi_match);
2127 #endif
2128
2129 #ifdef CONFIG_OF
2130 static const struct of_device_id xgene_enet_of_match[] = {
2131 {.compatible = "apm,xgene-enet", .data = (void *)XGENE_ENET1},
2132 {.compatible = "apm,xgene1-sgenet", .data = (void *)XGENE_ENET1},
2133 {.compatible = "apm,xgene1-xgenet", .data = (void *)XGENE_ENET1},
2134 {.compatible = "apm,xgene2-sgenet", .data = (void *)XGENE_ENET2},
2135 {.compatible = "apm,xgene2-xgenet", .data = (void *)XGENE_ENET2},
2136 {},
2137 };
2138
2139 MODULE_DEVICE_TABLE(of, xgene_enet_of_match);
2140 #endif
2141
2142 static struct platform_driver xgene_enet_driver = {
2143 .driver = {
2144 .name = "xgene-enet",
2145 .of_match_table = of_match_ptr(xgene_enet_of_match),
2146 .acpi_match_table = ACPI_PTR(xgene_enet_acpi_match),
2147 },
2148 .probe = xgene_enet_probe,
2149 .remove = xgene_enet_remove,
2150 .shutdown = xgene_enet_shutdown,
2151 };
2152
2153 module_platform_driver(xgene_enet_driver);
2154
2155 MODULE_DESCRIPTION("APM X-Gene SoC Ethernet driver");
2156 MODULE_VERSION(XGENE_DRV_VERSION);
2157 MODULE_AUTHOR("Iyappan Subramanian <isubramanian@apm.com>");
2158 MODULE_AUTHOR("Keyur Chudgar <kchudgar@apm.com>");
2159 MODULE_LICENSE("GPL");
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