aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/net/ethernet/renesas/ravb_main.c
diff options
context:
space:
mode:
authorSergei Shtylyov <sergei.shtylyov@cogentembedded.com>2015-06-10 18:02:30 -0400
committerDavid S. Miller <davem@davemloft.net>2015-06-11 03:24:12 -0400
commita0d2f20650e81407d8e51ad2cbdc492861c74e9c (patch)
tree56c9c1c4f4fcf26d246f3a0a8649729e496edf22 /drivers/net/ethernet/renesas/ravb_main.c
parentc156633f1353264634135dea86ffcae74f2122fc (diff)
Renesas Ethernet AVB PTP clock driver
Ethernet AVB device includes the gPTP timer, so we can implement a PTP clock driver. We're doing that in a separate file, with the main Ethernet driver calling the PTP driver's [de]initialization and interrupt handler functions. Unfortunately, the clock seems tightly coupled with the AVB-DMAC, so when that one leaves the operation mode, we have to unregister the PTP clock... :-( Based on the original patches by Masaru Nagai. Signed-off-by: Masaru Nagai <masaru.nagai.vx@renesas.com> Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/ethernet/renesas/ravb_main.c')
-rw-r--r--drivers/net/ethernet/renesas/ravb_main.c1824
1 files changed, 1824 insertions, 0 deletions
diff --git a/drivers/net/ethernet/renesas/ravb_main.c b/drivers/net/ethernet/renesas/ravb_main.c
new file mode 100644
index 000000000000..fd9745714d90
--- /dev/null
+++ b/drivers/net/ethernet/renesas/ravb_main.c
@@ -0,0 +1,1824 @@
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 "ravb.h"
36
37#define RAVB_DEF_MSG_ENABLE \
38 (NETIF_MSG_LINK | \
39 NETIF_MSG_TIMER | \
40 NETIF_MSG_RX_ERR | \
41 NETIF_MSG_TX_ERR)
42
43int ravb_wait(struct net_device *ndev, enum ravb_reg reg, u32 mask, u32 value)
44{
45 int i;
46
47 for (i = 0; i < 10000; i++) {
48 if ((ravb_read(ndev, reg) & mask) == value)
49 return 0;
50 udelay(10);
51 }
52 return -ETIMEDOUT;
53}
54
55static int ravb_config(struct net_device *ndev)
56{
57 int error;
58
59 /* Set config mode */
60 ravb_write(ndev, (ravb_read(ndev, CCC) & ~CCC_OPC) | CCC_OPC_CONFIG,
61 CCC);
62 /* Check if the operating mode is changed to the config mode */
63 error = ravb_wait(ndev, CSR, CSR_OPS, CSR_OPS_CONFIG);
64 if (error)
65 netdev_err(ndev, "failed to switch device to config mode\n");
66
67 return error;
68}
69
70static void ravb_set_duplex(struct net_device *ndev)
71{
72 struct ravb_private *priv = netdev_priv(ndev);
73 u32 ecmr = ravb_read(ndev, ECMR);
74
75 if (priv->duplex) /* Full */
76 ecmr |= ECMR_DM;
77 else /* Half */
78 ecmr &= ~ECMR_DM;
79 ravb_write(ndev, ecmr, ECMR);
80}
81
82static void ravb_set_rate(struct net_device *ndev)
83{
84 struct ravb_private *priv = netdev_priv(ndev);
85
86 switch (priv->speed) {
87 case 100: /* 100BASE */
88 ravb_write(ndev, GECMR_SPEED_100, GECMR);
89 break;
90 case 1000: /* 1000BASE */
91 ravb_write(ndev, GECMR_SPEED_1000, GECMR);
92 break;
93 default:
94 break;
95 }
96}
97
98static void ravb_set_buffer_align(struct sk_buff *skb)
99{
100 u32 reserve = (unsigned long)skb->data & (RAVB_ALIGN - 1);
101
102 if (reserve)
103 skb_reserve(skb, RAVB_ALIGN - reserve);
104}
105
106/* Get MAC address from the MAC address registers
107 *
108 * Ethernet AVB device doesn't have ROM for MAC address.
109 * This function gets the MAC address that was used by a bootloader.
110 */
111static void ravb_read_mac_address(struct net_device *ndev, const u8 *mac)
112{
113 if (mac) {
114 ether_addr_copy(ndev->dev_addr, mac);
115 } else {
116 ndev->dev_addr[0] = (ravb_read(ndev, MAHR) >> 24);
117 ndev->dev_addr[1] = (ravb_read(ndev, MAHR) >> 16) & 0xFF;
118 ndev->dev_addr[2] = (ravb_read(ndev, MAHR) >> 8) & 0xFF;
119 ndev->dev_addr[3] = (ravb_read(ndev, MAHR) >> 0) & 0xFF;
120 ndev->dev_addr[4] = (ravb_read(ndev, MALR) >> 8) & 0xFF;
121 ndev->dev_addr[5] = (ravb_read(ndev, MALR) >> 0) & 0xFF;
122 }
123}
124
125static void ravb_mdio_ctrl(struct mdiobb_ctrl *ctrl, u32 mask, int set)
126{
127 struct ravb_private *priv = container_of(ctrl, struct ravb_private,
128 mdiobb);
129 u32 pir = ravb_read(priv->ndev, PIR);
130
131 if (set)
132 pir |= mask;
133 else
134 pir &= ~mask;
135 ravb_write(priv->ndev, pir, PIR);
136}
137
138/* MDC pin control */
139static void ravb_set_mdc(struct mdiobb_ctrl *ctrl, int level)
140{
141 ravb_mdio_ctrl(ctrl, PIR_MDC, level);
142}
143
144/* Data I/O pin control */
145static void ravb_set_mdio_dir(struct mdiobb_ctrl *ctrl, int output)
146{
147 ravb_mdio_ctrl(ctrl, PIR_MMD, output);
148}
149
150/* Set data bit */
151static void ravb_set_mdio_data(struct mdiobb_ctrl *ctrl, int value)
152{
153 ravb_mdio_ctrl(ctrl, PIR_MDO, value);
154}
155
156/* Get data bit */
157static int ravb_get_mdio_data(struct mdiobb_ctrl *ctrl)
158{
159 struct ravb_private *priv = container_of(ctrl, struct ravb_private,
160 mdiobb);
161
162 return (ravb_read(priv->ndev, PIR) & PIR_MDI) != 0;
163}
164
165/* MDIO bus control struct */
166static struct mdiobb_ops bb_ops = {
167 .owner = THIS_MODULE,
168 .set_mdc = ravb_set_mdc,
169 .set_mdio_dir = ravb_set_mdio_dir,
170 .set_mdio_data = ravb_set_mdio_data,
171 .get_mdio_data = ravb_get_mdio_data,
172};
173
174/* Free skb's and DMA buffers for Ethernet AVB */
175static void ravb_ring_free(struct net_device *ndev, int q)
176{
177 struct ravb_private *priv = netdev_priv(ndev);
178 int ring_size;
179 int i;
180
181 /* Free RX skb ringbuffer */
182 if (priv->rx_skb[q]) {
183 for (i = 0; i < priv->num_rx_ring[q]; i++)
184 dev_kfree_skb(priv->rx_skb[q][i]);
185 }
186 kfree(priv->rx_skb[q]);
187 priv->rx_skb[q] = NULL;
188
189 /* Free TX skb ringbuffer */
190 if (priv->tx_skb[q]) {
191 for (i = 0; i < priv->num_tx_ring[q]; i++)
192 dev_kfree_skb(priv->tx_skb[q][i]);
193 }
194 kfree(priv->tx_skb[q]);
195 priv->tx_skb[q] = NULL;
196
197 /* Free aligned TX buffers */
198 if (priv->tx_buffers[q]) {
199 for (i = 0; i < priv->num_tx_ring[q]; i++)
200 kfree(priv->tx_buffers[q][i]);
201 }
202 kfree(priv->tx_buffers[q]);
203 priv->tx_buffers[q] = NULL;
204
205 if (priv->rx_ring[q]) {
206 ring_size = sizeof(struct ravb_ex_rx_desc) *
207 (priv->num_rx_ring[q] + 1);
208 dma_free_coherent(NULL, ring_size, priv->rx_ring[q],
209 priv->rx_desc_dma[q]);
210 priv->rx_ring[q] = NULL;
211 }
212
213 if (priv->tx_ring[q]) {
214 ring_size = sizeof(struct ravb_tx_desc) *
215 (priv->num_tx_ring[q] + 1);
216 dma_free_coherent(NULL, ring_size, priv->tx_ring[q],
217 priv->tx_desc_dma[q]);
218 priv->tx_ring[q] = NULL;
219 }
220}
221
222/* Format skb and descriptor buffer for Ethernet AVB */
223static void ravb_ring_format(struct net_device *ndev, int q)
224{
225 struct ravb_private *priv = netdev_priv(ndev);
226 struct ravb_ex_rx_desc *rx_desc = NULL;
227 struct ravb_tx_desc *tx_desc = NULL;
228 struct ravb_desc *desc = NULL;
229 int rx_ring_size = sizeof(*rx_desc) * priv->num_rx_ring[q];
230 int tx_ring_size = sizeof(*tx_desc) * priv->num_tx_ring[q];
231 struct sk_buff *skb;
232 dma_addr_t dma_addr;
233 void *buffer;
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 priv->rx_skb[q][i] = NULL;
245 skb = netdev_alloc_skb(ndev, PKT_BUF_SZ + RAVB_ALIGN - 1);
246 if (!skb)
247 break;
248 ravb_set_buffer_align(skb);
249 /* RX descriptor */
250 rx_desc = &priv->rx_ring[q][i];
251 /* The size of the buffer should be on 16-byte boundary. */
252 rx_desc->ds_cc = cpu_to_le16(ALIGN(PKT_BUF_SZ, 16));
253 dma_addr = dma_map_single(&ndev->dev, skb->data,
254 ALIGN(PKT_BUF_SZ, 16),
255 DMA_FROM_DEVICE);
256 if (dma_mapping_error(&ndev->dev, dma_addr)) {
257 dev_kfree_skb(skb);
258 break;
259 }
260 priv->rx_skb[q][i] = skb;
261 rx_desc->dptr = cpu_to_le32(dma_addr);
262 rx_desc->die_dt = DT_FEMPTY;
263 }
264 rx_desc = &priv->rx_ring[q][i];
265 rx_desc->dptr = cpu_to_le32((u32)priv->rx_desc_dma[q]);
266 rx_desc->die_dt = DT_LINKFIX; /* type */
267 priv->dirty_rx[q] = (u32)(i - priv->num_rx_ring[q]);
268
269 memset(priv->tx_ring[q], 0, tx_ring_size);
270 /* Build TX ring buffer */
271 for (i = 0; i < priv->num_tx_ring[q]; i++) {
272 priv->tx_skb[q][i] = NULL;
273 priv->tx_buffers[q][i] = NULL;
274 buffer = kmalloc(PKT_BUF_SZ + RAVB_ALIGN - 1, GFP_KERNEL);
275 if (!buffer)
276 break;
277 /* Aligned TX buffer */
278 priv->tx_buffers[q][i] = buffer;
279 tx_desc = &priv->tx_ring[q][i];
280 tx_desc->die_dt = DT_EEMPTY;
281 }
282 tx_desc = &priv->tx_ring[q][i];
283 tx_desc->dptr = cpu_to_le32((u32)priv->tx_desc_dma[q]);
284 tx_desc->die_dt = DT_LINKFIX; /* type */
285
286 /* RX descriptor base address for best effort */
287 desc = &priv->desc_bat[RX_QUEUE_OFFSET + q];
288 desc->die_dt = DT_LINKFIX; /* type */
289 desc->dptr = cpu_to_le32((u32)priv->rx_desc_dma[q]);
290
291 /* TX descriptor base address for best effort */
292 desc = &priv->desc_bat[q];
293 desc->die_dt = DT_LINKFIX; /* type */
294 desc->dptr = cpu_to_le32((u32)priv->tx_desc_dma[q]);
295}
296
297/* Init skb and descriptor buffer for Ethernet AVB */
298static int ravb_ring_init(struct net_device *ndev, int q)
299{
300 struct ravb_private *priv = netdev_priv(ndev);
301 int ring_size;
302
303 /* Allocate RX and TX skb rings */
304 priv->rx_skb[q] = kcalloc(priv->num_rx_ring[q],
305 sizeof(*priv->rx_skb[q]), GFP_KERNEL);
306 priv->tx_skb[q] = kcalloc(priv->num_tx_ring[q],
307 sizeof(*priv->tx_skb[q]), GFP_KERNEL);
308 if (!priv->rx_skb[q] || !priv->tx_skb[q])
309 goto error;
310
311 /* Allocate rings for the aligned buffers */
312 priv->tx_buffers[q] = kcalloc(priv->num_tx_ring[q],
313 sizeof(*priv->tx_buffers[q]), GFP_KERNEL);
314 if (!priv->tx_buffers[q])
315 goto error;
316
317 /* Allocate all RX descriptors. */
318 ring_size = sizeof(struct ravb_ex_rx_desc) * (priv->num_rx_ring[q] + 1);
319 priv->rx_ring[q] = dma_alloc_coherent(NULL, ring_size,
320 &priv->rx_desc_dma[q],
321 GFP_KERNEL);
322 if (!priv->rx_ring[q])
323 goto error;
324
325 priv->dirty_rx[q] = 0;
326
327 /* Allocate all TX descriptors. */
328 ring_size = sizeof(struct ravb_tx_desc) * (priv->num_tx_ring[q] + 1);
329 priv->tx_ring[q] = dma_alloc_coherent(NULL, ring_size,
330 &priv->tx_desc_dma[q],
331 GFP_KERNEL);
332 if (!priv->tx_ring[q])
333 goto error;
334
335 return 0;
336
337error:
338 ravb_ring_free(ndev, q);
339
340 return -ENOMEM;
341}
342
343/* E-MAC init function */
344static void ravb_emac_init(struct net_device *ndev)
345{
346 struct ravb_private *priv = netdev_priv(ndev);
347 u32 ecmr;
348
349 /* Receive frame limit set register */
350 ravb_write(ndev, ndev->mtu + ETH_HLEN + VLAN_HLEN + ETH_FCS_LEN, RFLR);
351
352 /* PAUSE prohibition */
353 ecmr = ravb_read(ndev, ECMR);
354 ecmr &= ECMR_DM;
355 ecmr |= ECMR_ZPF | (priv->duplex ? ECMR_DM : 0) | ECMR_TE | ECMR_RE;
356 ravb_write(ndev, ecmr, ECMR);
357
358 ravb_set_rate(ndev);
359
360 /* Set MAC address */
361 ravb_write(ndev,
362 (ndev->dev_addr[0] << 24) | (ndev->dev_addr[1] << 16) |
363 (ndev->dev_addr[2] << 8) | (ndev->dev_addr[3]), MAHR);
364 ravb_write(ndev,
365 (ndev->dev_addr[4] << 8) | (ndev->dev_addr[5]), MALR);
366
367 ravb_write(ndev, 1, MPR);
368
369 /* E-MAC status register clear */
370 ravb_write(ndev, ECSR_ICD | ECSR_MPD, ECSR);
371
372 /* E-MAC interrupt enable register */
373 ravb_write(ndev, ECSIPR_ICDIP | ECSIPR_MPDIP | ECSIPR_LCHNGIP, ECSIPR);
374}
375
376/* Device init function for Ethernet AVB */
377static int ravb_dmac_init(struct net_device *ndev)
378{
379 int error;
380
381 /* Set CONFIG mode */
382 error = ravb_config(ndev);
383 if (error)
384 return error;
385
386 error = ravb_ring_init(ndev, RAVB_BE);
387 if (error)
388 return error;
389 error = ravb_ring_init(ndev, RAVB_NC);
390 if (error) {
391 ravb_ring_free(ndev, RAVB_BE);
392 return error;
393 }
394
395 /* Descriptor format */
396 ravb_ring_format(ndev, RAVB_BE);
397 ravb_ring_format(ndev, RAVB_NC);
398
399#if defined(__LITTLE_ENDIAN)
400 ravb_write(ndev, ravb_read(ndev, CCC) & ~CCC_BOC, CCC);
401#else
402 ravb_write(ndev, ravb_read(ndev, CCC) | CCC_BOC, CCC);
403#endif
404
405 /* Set AVB RX */
406 ravb_write(ndev, RCR_EFFS | RCR_ENCF | RCR_ETS0 | 0x18000000, RCR);
407
408 /* Set FIFO size */
409 ravb_write(ndev, TGC_TQP_AVBMODE1 | 0x00222200, TGC);
410
411 /* Timestamp enable */
412 ravb_write(ndev, TCCR_TFEN, TCCR);
413
414 /* Interrupt enable: */
415 /* Frame receive */
416 ravb_write(ndev, RIC0_FRE0 | RIC0_FRE1, RIC0);
417 /* Receive FIFO full warning */
418 ravb_write(ndev, RIC1_RFWE, RIC1);
419 /* Receive FIFO full error, descriptor empty */
420 ravb_write(ndev, RIC2_QFE0 | RIC2_QFE1 | RIC2_RFFE, RIC2);
421 /* Frame transmitted, timestamp FIFO updated */
422 ravb_write(ndev, TIC_FTE0 | TIC_FTE1 | TIC_TFUE, TIC);
423
424 /* Setting the control will start the AVB-DMAC process. */
425 ravb_write(ndev, (ravb_read(ndev, CCC) & ~CCC_OPC) | CCC_OPC_OPERATION,
426 CCC);
427
428 return 0;
429}
430
431/* Free TX skb function for AVB-IP */
432static int ravb_tx_free(struct net_device *ndev, int q)
433{
434 struct ravb_private *priv = netdev_priv(ndev);
435 struct net_device_stats *stats = &priv->stats[q];
436 struct ravb_tx_desc *desc;
437 int free_num = 0;
438 int entry = 0;
439 u32 size;
440
441 for (; priv->cur_tx[q] - priv->dirty_tx[q] > 0; priv->dirty_tx[q]++) {
442 entry = priv->dirty_tx[q] % priv->num_tx_ring[q];
443 desc = &priv->tx_ring[q][entry];
444 if (desc->die_dt != DT_FEMPTY)
445 break;
446 /* Descriptor type must be checked before all other reads */
447 dma_rmb();
448 size = le16_to_cpu(desc->ds_tagl) & TX_DS;
449 /* Free the original skb. */
450 if (priv->tx_skb[q][entry]) {
451 dma_unmap_single(&ndev->dev, le32_to_cpu(desc->dptr),
452 size, DMA_TO_DEVICE);
453 dev_kfree_skb_any(priv->tx_skb[q][entry]);
454 priv->tx_skb[q][entry] = NULL;
455 free_num++;
456 }
457 stats->tx_packets++;
458 stats->tx_bytes += size;
459 desc->die_dt = DT_EEMPTY;
460 }
461 return free_num;
462}
463
464static void ravb_get_tx_tstamp(struct net_device *ndev)
465{
466 struct ravb_private *priv = netdev_priv(ndev);
467 struct ravb_tstamp_skb *ts_skb, *ts_skb2;
468 struct skb_shared_hwtstamps shhwtstamps;
469 struct sk_buff *skb;
470 struct timespec64 ts;
471 u16 tag, tfa_tag;
472 int count;
473 u32 tfa2;
474
475 count = (ravb_read(ndev, TSR) & TSR_TFFL) >> 8;
476 while (count--) {
477 tfa2 = ravb_read(ndev, TFA2);
478 tfa_tag = (tfa2 & TFA2_TST) >> 16;
479 ts.tv_nsec = (u64)ravb_read(ndev, TFA0);
480 ts.tv_sec = ((u64)(tfa2 & TFA2_TSV) << 32) |
481 ravb_read(ndev, TFA1);
482 memset(&shhwtstamps, 0, sizeof(shhwtstamps));
483 shhwtstamps.hwtstamp = timespec64_to_ktime(ts);
484 list_for_each_entry_safe(ts_skb, ts_skb2, &priv->ts_skb_list,
485 list) {
486 skb = ts_skb->skb;
487 tag = ts_skb->tag;
488 list_del(&ts_skb->list);
489 kfree(ts_skb);
490 if (tag == tfa_tag) {
491 skb_tstamp_tx(skb, &shhwtstamps);
492 break;
493 }
494 }
495 ravb_write(ndev, ravb_read(ndev, TCCR) | TCCR_TFR, TCCR);
496 }
497}
498
499/* Packet receive function for Ethernet AVB */
500static bool ravb_rx(struct net_device *ndev, int *quota, int q)
501{
502 struct ravb_private *priv = netdev_priv(ndev);
503 int entry = priv->cur_rx[q] % priv->num_rx_ring[q];
504 int boguscnt = (priv->dirty_rx[q] + priv->num_rx_ring[q]) -
505 priv->cur_rx[q];
506 struct net_device_stats *stats = &priv->stats[q];
507 struct ravb_ex_rx_desc *desc;
508 struct sk_buff *skb;
509 dma_addr_t dma_addr;
510 struct timespec64 ts;
511 u16 pkt_len = 0;
512 u8 desc_status;
513 int limit;
514
515 boguscnt = min(boguscnt, *quota);
516 limit = boguscnt;
517 desc = &priv->rx_ring[q][entry];
518 while (desc->die_dt != DT_FEMPTY) {
519 /* Descriptor type must be checked before all other reads */
520 dma_rmb();
521 desc_status = desc->msc;
522 pkt_len = le16_to_cpu(desc->ds_cc) & RX_DS;
523
524 if (--boguscnt < 0)
525 break;
526
527 if (desc_status & MSC_MC)
528 stats->multicast++;
529
530 if (desc_status & (MSC_CRC | MSC_RFE | MSC_RTSF | MSC_RTLF |
531 MSC_CEEF)) {
532 stats->rx_errors++;
533 if (desc_status & MSC_CRC)
534 stats->rx_crc_errors++;
535 if (desc_status & MSC_RFE)
536 stats->rx_frame_errors++;
537 if (desc_status & (MSC_RTLF | MSC_RTSF))
538 stats->rx_length_errors++;
539 if (desc_status & MSC_CEEF)
540 stats->rx_missed_errors++;
541 } else {
542 u32 get_ts = priv->tstamp_rx_ctrl & RAVB_RXTSTAMP_TYPE;
543
544 skb = priv->rx_skb[q][entry];
545 priv->rx_skb[q][entry] = NULL;
546 dma_sync_single_for_cpu(&ndev->dev,
547 le32_to_cpu(desc->dptr),
548 ALIGN(PKT_BUF_SZ, 16),
549 DMA_FROM_DEVICE);
550 get_ts &= (q == RAVB_NC) ?
551 RAVB_RXTSTAMP_TYPE_V2_L2_EVENT :
552 ~RAVB_RXTSTAMP_TYPE_V2_L2_EVENT;
553 if (get_ts) {
554 struct skb_shared_hwtstamps *shhwtstamps;
555
556 shhwtstamps = skb_hwtstamps(skb);
557 memset(shhwtstamps, 0, sizeof(*shhwtstamps));
558 ts.tv_sec = ((u64) le16_to_cpu(desc->ts_sh) <<
559 32) | le32_to_cpu(desc->ts_sl);
560 ts.tv_nsec = le32_to_cpu(desc->ts_n);
561 shhwtstamps->hwtstamp = timespec64_to_ktime(ts);
562 }
563 skb_put(skb, pkt_len);
564 skb->protocol = eth_type_trans(skb, ndev);
565 napi_gro_receive(&priv->napi[q], skb);
566 stats->rx_packets++;
567 stats->rx_bytes += pkt_len;
568 }
569
570 entry = (++priv->cur_rx[q]) % priv->num_rx_ring[q];
571 desc = &priv->rx_ring[q][entry];
572 }
573
574 /* Refill the RX ring buffers. */
575 for (; priv->cur_rx[q] - priv->dirty_rx[q] > 0; priv->dirty_rx[q]++) {
576 entry = priv->dirty_rx[q] % priv->num_rx_ring[q];
577 desc = &priv->rx_ring[q][entry];
578 /* The size of the buffer should be on 16-byte boundary. */
579 desc->ds_cc = cpu_to_le16(ALIGN(PKT_BUF_SZ, 16));
580
581 if (!priv->rx_skb[q][entry]) {
582 skb = netdev_alloc_skb(ndev,
583 PKT_BUF_SZ + RAVB_ALIGN - 1);
584 if (!skb)
585 break; /* Better luck next round. */
586 ravb_set_buffer_align(skb);
587 dma_unmap_single(&ndev->dev, le32_to_cpu(desc->dptr),
588 ALIGN(PKT_BUF_SZ, 16),
589 DMA_FROM_DEVICE);
590 dma_addr = dma_map_single(&ndev->dev, skb->data,
591 le16_to_cpu(desc->ds_cc),
592 DMA_FROM_DEVICE);
593 skb_checksum_none_assert(skb);
594 if (dma_mapping_error(&ndev->dev, dma_addr)) {
595 dev_kfree_skb_any(skb);
596 break;
597 }
598 desc->dptr = cpu_to_le32(dma_addr);
599 priv->rx_skb[q][entry] = skb;
600 }
601 /* Descriptor type must be set after all the above writes */
602 dma_wmb();
603 desc->die_dt = DT_FEMPTY;
604 }
605
606 *quota -= limit - (++boguscnt);
607
608 return boguscnt <= 0;
609}
610
611static void ravb_rcv_snd_disable(struct net_device *ndev)
612{
613 /* Disable TX and RX */
614 ravb_write(ndev, ravb_read(ndev, ECMR) & ~(ECMR_RE | ECMR_TE), ECMR);
615}
616
617static void ravb_rcv_snd_enable(struct net_device *ndev)
618{
619 /* Enable TX and RX */
620 ravb_write(ndev, ravb_read(ndev, ECMR) | ECMR_RE | ECMR_TE, ECMR);
621}
622
623/* function for waiting dma process finished */
624static int ravb_stop_dma(struct net_device *ndev)
625{
626 int error;
627
628 /* Wait for stopping the hardware TX process */
629 error = ravb_wait(ndev, TCCR,
630 TCCR_TSRQ0 | TCCR_TSRQ1 | TCCR_TSRQ2 | TCCR_TSRQ3, 0);
631 if (error)
632 return error;
633
634 error = ravb_wait(ndev, CSR, CSR_TPO0 | CSR_TPO1 | CSR_TPO2 | CSR_TPO3,
635 0);
636 if (error)
637 return error;
638
639 /* Stop the E-MAC's RX/TX processes. */
640 ravb_rcv_snd_disable(ndev);
641
642 /* Wait for stopping the RX DMA process */
643 error = ravb_wait(ndev, CSR, CSR_RPO, 0);
644 if (error)
645 return error;
646
647 /* Stop AVB-DMAC process */
648 return ravb_config(ndev);
649}
650
651/* E-MAC interrupt handler */
652static void ravb_emac_interrupt(struct net_device *ndev)
653{
654 struct ravb_private *priv = netdev_priv(ndev);
655 u32 ecsr, psr;
656
657 ecsr = ravb_read(ndev, ECSR);
658 ravb_write(ndev, ecsr, ECSR); /* clear interrupt */
659 if (ecsr & ECSR_ICD)
660 ndev->stats.tx_carrier_errors++;
661 if (ecsr & ECSR_LCHNG) {
662 /* Link changed */
663 if (priv->no_avb_link)
664 return;
665 psr = ravb_read(ndev, PSR);
666 if (priv->avb_link_active_low)
667 psr ^= PSR_LMON;
668 if (!(psr & PSR_LMON)) {
669 /* DIsable RX and TX */
670 ravb_rcv_snd_disable(ndev);
671 } else {
672 /* Enable RX and TX */
673 ravb_rcv_snd_enable(ndev);
674 }
675 }
676}
677
678/* Error interrupt handler */
679static void ravb_error_interrupt(struct net_device *ndev)
680{
681 struct ravb_private *priv = netdev_priv(ndev);
682 u32 eis, ris2;
683
684 eis = ravb_read(ndev, EIS);
685 ravb_write(ndev, ~EIS_QFS, EIS);
686 if (eis & EIS_QFS) {
687 ris2 = ravb_read(ndev, RIS2);
688 ravb_write(ndev, ~(RIS2_QFF0 | RIS2_RFFF), RIS2);
689
690 /* Receive Descriptor Empty int */
691 if (ris2 & RIS2_QFF0)
692 priv->stats[RAVB_BE].rx_over_errors++;
693
694 /* Receive Descriptor Empty int */
695 if (ris2 & RIS2_QFF1)
696 priv->stats[RAVB_NC].rx_over_errors++;
697
698 /* Receive FIFO Overflow int */
699 if (ris2 & RIS2_RFFF)
700 priv->rx_fifo_errors++;
701 }
702}
703
704static irqreturn_t ravb_interrupt(int irq, void *dev_id)
705{
706 struct net_device *ndev = dev_id;
707 struct ravb_private *priv = netdev_priv(ndev);
708 irqreturn_t result = IRQ_NONE;
709 u32 iss;
710
711 spin_lock(&priv->lock);
712 /* Get interrupt status */
713 iss = ravb_read(ndev, ISS);
714
715 /* Received and transmitted interrupts */
716 if (iss & (ISS_FRS | ISS_FTS | ISS_TFUS)) {
717 u32 ris0 = ravb_read(ndev, RIS0);
718 u32 ric0 = ravb_read(ndev, RIC0);
719 u32 tis = ravb_read(ndev, TIS);
720 u32 tic = ravb_read(ndev, TIC);
721 int q;
722
723 /* Timestamp updated */
724 if (tis & TIS_TFUF) {
725 ravb_write(ndev, ~TIS_TFUF, TIS);
726 ravb_get_tx_tstamp(ndev);
727 result = IRQ_HANDLED;
728 }
729
730 /* Network control and best effort queue RX/TX */
731 for (q = RAVB_NC; q >= RAVB_BE; q--) {
732 if (((ris0 & ric0) & BIT(q)) ||
733 ((tis & tic) & BIT(q))) {
734 if (napi_schedule_prep(&priv->napi[q])) {
735 /* Mask RX and TX interrupts */
736 ravb_write(ndev, ric0 & ~BIT(q), RIC0);
737 ravb_write(ndev, tic & ~BIT(q), TIC);
738 __napi_schedule(&priv->napi[q]);
739 } else {
740 netdev_warn(ndev,
741 "ignoring interrupt, rx status 0x%08x, rx mask 0x%08x,\n",
742 ris0, ric0);
743 netdev_warn(ndev,
744 " tx status 0x%08x, tx mask 0x%08x.\n",
745 tis, tic);
746 }
747 result = IRQ_HANDLED;
748 }
749 }
750 }
751
752 /* E-MAC status summary */
753 if (iss & ISS_MS) {
754 ravb_emac_interrupt(ndev);
755 result = IRQ_HANDLED;
756 }
757
758 /* Error status summary */
759 if (iss & ISS_ES) {
760 ravb_error_interrupt(ndev);
761 result = IRQ_HANDLED;
762 }
763
764 if (iss & ISS_CGIS)
765 result = ravb_ptp_interrupt(ndev);
766
767 mmiowb();
768 spin_unlock(&priv->lock);
769 return result;
770}
771
772static int ravb_poll(struct napi_struct *napi, int budget)
773{
774 struct net_device *ndev = napi->dev;
775 struct ravb_private *priv = netdev_priv(ndev);
776 unsigned long flags;
777 int q = napi - priv->napi;
778 int mask = BIT(q);
779 int quota = budget;
780 u32 ris0, tis;
781
782 for (;;) {
783 tis = ravb_read(ndev, TIS);
784 ris0 = ravb_read(ndev, RIS0);
785 if (!((ris0 & mask) || (tis & mask)))
786 break;
787
788 /* Processing RX Descriptor Ring */
789 if (ris0 & mask) {
790 /* Clear RX interrupt */
791 ravb_write(ndev, ~mask, RIS0);
792 if (ravb_rx(ndev, &quota, q))
793 goto out;
794 }
795 /* Processing TX Descriptor Ring */
796 if (tis & mask) {
797 spin_lock_irqsave(&priv->lock, flags);
798 /* Clear TX interrupt */
799 ravb_write(ndev, ~mask, TIS);
800 ravb_tx_free(ndev, q);
801 netif_wake_subqueue(ndev, q);
802 mmiowb();
803 spin_unlock_irqrestore(&priv->lock, flags);
804 }
805 }
806
807 napi_complete(napi);
808
809 /* Re-enable RX/TX interrupts */
810 spin_lock_irqsave(&priv->lock, flags);
811 ravb_write(ndev, ravb_read(ndev, RIC0) | mask, RIC0);
812 ravb_write(ndev, ravb_read(ndev, TIC) | mask, TIC);
813 mmiowb();
814 spin_unlock_irqrestore(&priv->lock, flags);
815
816 /* Receive error message handling */
817 priv->rx_over_errors = priv->stats[RAVB_BE].rx_over_errors;
818 priv->rx_over_errors += priv->stats[RAVB_NC].rx_over_errors;
819 if (priv->rx_over_errors != ndev->stats.rx_over_errors) {
820 ndev->stats.rx_over_errors = priv->rx_over_errors;
821 netif_err(priv, rx_err, ndev, "Receive Descriptor Empty\n");
822 }
823 if (priv->rx_fifo_errors != ndev->stats.rx_fifo_errors) {
824 ndev->stats.rx_fifo_errors = priv->rx_fifo_errors;
825 netif_err(priv, rx_err, ndev, "Receive FIFO Overflow\n");
826 }
827out:
828 return budget - quota;
829}
830
831/* PHY state control function */
832static void ravb_adjust_link(struct net_device *ndev)
833{
834 struct ravb_private *priv = netdev_priv(ndev);
835 struct phy_device *phydev = priv->phydev;
836 bool new_state = false;
837
838 if (phydev->link) {
839 if (phydev->duplex != priv->duplex) {
840 new_state = true;
841 priv->duplex = phydev->duplex;
842 ravb_set_duplex(ndev);
843 }
844
845 if (phydev->speed != priv->speed) {
846 new_state = true;
847 priv->speed = phydev->speed;
848 ravb_set_rate(ndev);
849 }
850 if (!priv->link) {
851 ravb_write(ndev, ravb_read(ndev, ECMR) & ~ECMR_TXF,
852 ECMR);
853 new_state = true;
854 priv->link = phydev->link;
855 if (priv->no_avb_link)
856 ravb_rcv_snd_enable(ndev);
857 }
858 } else if (priv->link) {
859 new_state = true;
860 priv->link = 0;
861 priv->speed = 0;
862 priv->duplex = -1;
863 if (priv->no_avb_link)
864 ravb_rcv_snd_disable(ndev);
865 }
866
867 if (new_state && netif_msg_link(priv))
868 phy_print_status(phydev);
869}
870
871/* PHY init function */
872static int ravb_phy_init(struct net_device *ndev)
873{
874 struct device_node *np = ndev->dev.parent->of_node;
875 struct ravb_private *priv = netdev_priv(ndev);
876 struct phy_device *phydev;
877 struct device_node *pn;
878
879 priv->link = 0;
880 priv->speed = 0;
881 priv->duplex = -1;
882
883 /* Try connecting to PHY */
884 pn = of_parse_phandle(np, "phy-handle", 0);
885 phydev = of_phy_connect(ndev, pn, ravb_adjust_link, 0,
886 priv->phy_interface);
887 if (!phydev) {
888 netdev_err(ndev, "failed to connect PHY\n");
889 return -ENOENT;
890 }
891
892 netdev_info(ndev, "attached PHY %d (IRQ %d) to driver %s\n",
893 phydev->addr, phydev->irq, phydev->drv->name);
894
895 priv->phydev = phydev;
896
897 return 0;
898}
899
900/* PHY control start function */
901static int ravb_phy_start(struct net_device *ndev)
902{
903 struct ravb_private *priv = netdev_priv(ndev);
904 int error;
905
906 error = ravb_phy_init(ndev);
907 if (error)
908 return error;
909
910 phy_start(priv->phydev);
911
912 return 0;
913}
914
915static int ravb_get_settings(struct net_device *ndev, struct ethtool_cmd *ecmd)
916{
917 struct ravb_private *priv = netdev_priv(ndev);
918 int error = -ENODEV;
919 unsigned long flags;
920
921 if (priv->phydev) {
922 spin_lock_irqsave(&priv->lock, flags);
923 error = phy_ethtool_gset(priv->phydev, ecmd);
924 spin_unlock_irqrestore(&priv->lock, flags);
925 }
926
927 return error;
928}
929
930static int ravb_set_settings(struct net_device *ndev, struct ethtool_cmd *ecmd)
931{
932 struct ravb_private *priv = netdev_priv(ndev);
933 unsigned long flags;
934 int error;
935
936 if (!priv->phydev)
937 return -ENODEV;
938
939 spin_lock_irqsave(&priv->lock, flags);
940
941 /* Disable TX and RX */
942 ravb_rcv_snd_disable(ndev);
943
944 error = phy_ethtool_sset(priv->phydev, ecmd);
945 if (error)
946 goto error_exit;
947
948 if (ecmd->duplex == DUPLEX_FULL)
949 priv->duplex = 1;
950 else
951 priv->duplex = 0;
952
953 ravb_set_duplex(ndev);
954
955error_exit:
956 mdelay(1);
957
958 /* Enable TX and RX */
959 ravb_rcv_snd_enable(ndev);
960
961 mmiowb();
962 spin_unlock_irqrestore(&priv->lock, flags);
963
964 return error;
965}
966
967static int ravb_nway_reset(struct net_device *ndev)
968{
969 struct ravb_private *priv = netdev_priv(ndev);
970 int error = -ENODEV;
971 unsigned long flags;
972
973 if (priv->phydev) {
974 spin_lock_irqsave(&priv->lock, flags);
975 error = phy_start_aneg(priv->phydev);
976 spin_unlock_irqrestore(&priv->lock, flags);
977 }
978
979 return error;
980}
981
982static u32 ravb_get_msglevel(struct net_device *ndev)
983{
984 struct ravb_private *priv = netdev_priv(ndev);
985
986 return priv->msg_enable;
987}
988
989static void ravb_set_msglevel(struct net_device *ndev, u32 value)
990{
991 struct ravb_private *priv = netdev_priv(ndev);
992
993 priv->msg_enable = value;
994}
995
996static const char ravb_gstrings_stats[][ETH_GSTRING_LEN] = {
997 "rx_queue_0_current",
998 "tx_queue_0_current",
999 "rx_queue_0_dirty",
1000 "tx_queue_0_dirty",
1001 "rx_queue_0_packets",
1002 "tx_queue_0_packets",
1003 "rx_queue_0_bytes",
1004 "tx_queue_0_bytes",
1005 "rx_queue_0_mcast_packets",
1006 "rx_queue_0_errors",
1007 "rx_queue_0_crc_errors",
1008 "rx_queue_0_frame_errors",
1009 "rx_queue_0_length_errors",
1010 "rx_queue_0_missed_errors",
1011 "rx_queue_0_over_errors",
1012
1013 "rx_queue_1_current",
1014 "tx_queue_1_current",
1015 "rx_queue_1_dirty",
1016 "tx_queue_1_dirty",
1017 "rx_queue_1_packets",
1018 "tx_queue_1_packets",
1019 "rx_queue_1_bytes",
1020 "tx_queue_1_bytes",
1021 "rx_queue_1_mcast_packets",
1022 "rx_queue_1_errors",
1023 "rx_queue_1_crc_errors",
1024 "rx_queue_1_frame_errors_",
1025 "rx_queue_1_length_errors",
1026 "rx_queue_1_missed_errors",
1027 "rx_queue_1_over_errors",
1028};
1029
1030#define RAVB_STATS_LEN ARRAY_SIZE(ravb_gstrings_stats)
1031
1032static int ravb_get_sset_count(struct net_device *netdev, int sset)
1033{
1034 switch (sset) {
1035 case ETH_SS_STATS:
1036 return RAVB_STATS_LEN;
1037 default:
1038 return -EOPNOTSUPP;
1039 }
1040}
1041
1042static void ravb_get_ethtool_stats(struct net_device *ndev,
1043 struct ethtool_stats *stats, u64 *data)
1044{
1045 struct ravb_private *priv = netdev_priv(ndev);
1046 int i = 0;
1047 int q;
1048
1049 /* Device-specific stats */
1050 for (q = RAVB_BE; q < NUM_RX_QUEUE; q++) {
1051 struct net_device_stats *stats = &priv->stats[q];
1052
1053 data[i++] = priv->cur_rx[q];
1054 data[i++] = priv->cur_tx[q];
1055 data[i++] = priv->dirty_rx[q];
1056 data[i++] = priv->dirty_tx[q];
1057 data[i++] = stats->rx_packets;
1058 data[i++] = stats->tx_packets;
1059 data[i++] = stats->rx_bytes;
1060 data[i++] = stats->tx_bytes;
1061 data[i++] = stats->multicast;
1062 data[i++] = stats->rx_errors;
1063 data[i++] = stats->rx_crc_errors;
1064 data[i++] = stats->rx_frame_errors;
1065 data[i++] = stats->rx_length_errors;
1066 data[i++] = stats->rx_missed_errors;
1067 data[i++] = stats->rx_over_errors;
1068 }
1069}
1070
1071static void ravb_get_strings(struct net_device *ndev, u32 stringset, u8 *data)
1072{
1073 switch (stringset) {
1074 case ETH_SS_STATS:
1075 memcpy(data, *ravb_gstrings_stats, sizeof(ravb_gstrings_stats));
1076 break;
1077 }
1078}
1079
1080static void ravb_get_ringparam(struct net_device *ndev,
1081 struct ethtool_ringparam *ring)
1082{
1083 struct ravb_private *priv = netdev_priv(ndev);
1084
1085 ring->rx_max_pending = BE_RX_RING_MAX;
1086 ring->tx_max_pending = BE_TX_RING_MAX;
1087 ring->rx_pending = priv->num_rx_ring[RAVB_BE];
1088 ring->tx_pending = priv->num_tx_ring[RAVB_BE];
1089}
1090
1091static int ravb_set_ringparam(struct net_device *ndev,
1092 struct ethtool_ringparam *ring)
1093{
1094 struct ravb_private *priv = netdev_priv(ndev);
1095 int error;
1096
1097 if (ring->tx_pending > BE_TX_RING_MAX ||
1098 ring->rx_pending > BE_RX_RING_MAX ||
1099 ring->tx_pending < BE_TX_RING_MIN ||
1100 ring->rx_pending < BE_RX_RING_MIN)
1101 return -EINVAL;
1102 if (ring->rx_mini_pending || ring->rx_jumbo_pending)
1103 return -EINVAL;
1104
1105 if (netif_running(ndev)) {
1106 netif_device_detach(ndev);
1107 /* Stop PTP Clock driver */
1108 ravb_ptp_stop(ndev);
1109 /* Wait for DMA stopping */
1110 error = ravb_stop_dma(ndev);
1111 if (error) {
1112 netdev_err(ndev,
1113 "cannot set ringparam! Any AVB processes are still running?\n");
1114 return error;
1115 }
1116 synchronize_irq(ndev->irq);
1117
1118 /* Free all the skb's in the RX queue and the DMA buffers. */
1119 ravb_ring_free(ndev, RAVB_BE);
1120 ravb_ring_free(ndev, RAVB_NC);
1121 }
1122
1123 /* Set new parameters */
1124 priv->num_rx_ring[RAVB_BE] = ring->rx_pending;
1125 priv->num_tx_ring[RAVB_BE] = ring->tx_pending;
1126
1127 if (netif_running(ndev)) {
1128 error = ravb_dmac_init(ndev);
1129 if (error) {
1130 netdev_err(ndev,
1131 "%s: ravb_dmac_init() failed, error %d\n",
1132 __func__, error);
1133 return error;
1134 }
1135
1136 ravb_emac_init(ndev);
1137
1138 /* Initialise PTP Clock driver */
1139 ravb_ptp_init(ndev, priv->pdev);
1140
1141 netif_device_attach(ndev);
1142 }
1143
1144 return 0;
1145}
1146
1147static int ravb_get_ts_info(struct net_device *ndev,
1148 struct ethtool_ts_info *info)
1149{
1150 struct ravb_private *priv = netdev_priv(ndev);
1151
1152 info->so_timestamping =
1153 SOF_TIMESTAMPING_TX_SOFTWARE |
1154 SOF_TIMESTAMPING_RX_SOFTWARE |
1155 SOF_TIMESTAMPING_SOFTWARE |
1156 SOF_TIMESTAMPING_TX_HARDWARE |
1157 SOF_TIMESTAMPING_RX_HARDWARE |
1158 SOF_TIMESTAMPING_RAW_HARDWARE;
1159 info->tx_types = (1 << HWTSTAMP_TX_OFF) | (1 << HWTSTAMP_TX_ON);
1160 info->rx_filters =
1161 (1 << HWTSTAMP_FILTER_NONE) |
1162 (1 << HWTSTAMP_FILTER_PTP_V2_L2_EVENT) |
1163 (1 << HWTSTAMP_FILTER_ALL);
1164 info->phc_index = ptp_clock_index(priv->ptp.clock);
1165
1166 return 0;
1167}
1168
1169static const struct ethtool_ops ravb_ethtool_ops = {
1170 .get_settings = ravb_get_settings,
1171 .set_settings = ravb_set_settings,
1172 .nway_reset = ravb_nway_reset,
1173 .get_msglevel = ravb_get_msglevel,
1174 .set_msglevel = ravb_set_msglevel,
1175 .get_link = ethtool_op_get_link,
1176 .get_strings = ravb_get_strings,
1177 .get_ethtool_stats = ravb_get_ethtool_stats,
1178 .get_sset_count = ravb_get_sset_count,
1179 .get_ringparam = ravb_get_ringparam,
1180 .set_ringparam = ravb_set_ringparam,
1181 .get_ts_info = ravb_get_ts_info,
1182};
1183
1184/* Network device open function for Ethernet AVB */
1185static int ravb_open(struct net_device *ndev)
1186{
1187 struct ravb_private *priv = netdev_priv(ndev);
1188 int error;
1189
1190 napi_enable(&priv->napi[RAVB_BE]);
1191 napi_enable(&priv->napi[RAVB_NC]);
1192
1193 error = request_irq(ndev->irq, ravb_interrupt, IRQF_SHARED, ndev->name,
1194 ndev);
1195 if (error) {
1196 netdev_err(ndev, "cannot request IRQ\n");
1197 goto out_napi_off;
1198 }
1199
1200 /* Device init */
1201 error = ravb_dmac_init(ndev);
1202 if (error)
1203 goto out_free_irq;
1204 ravb_emac_init(ndev);
1205
1206 /* Initialise PTP Clock driver */
1207 ravb_ptp_init(ndev, priv->pdev);
1208
1209 netif_tx_start_all_queues(ndev);
1210
1211 /* PHY control start */
1212 error = ravb_phy_start(ndev);
1213 if (error)
1214 goto out_ptp_stop;
1215
1216 return 0;
1217
1218out_ptp_stop:
1219 /* Stop PTP Clock driver */
1220 ravb_ptp_stop(ndev);
1221out_free_irq:
1222 free_irq(ndev->irq, ndev);
1223out_napi_off:
1224 napi_disable(&priv->napi[RAVB_NC]);
1225 napi_disable(&priv->napi[RAVB_BE]);
1226 return error;
1227}
1228
1229/* Timeout function for Ethernet AVB */
1230static void ravb_tx_timeout(struct net_device *ndev)
1231{
1232 struct ravb_private *priv = netdev_priv(ndev);
1233
1234 netif_err(priv, tx_err, ndev,
1235 "transmit timed out, status %08x, resetting...\n",
1236 ravb_read(ndev, ISS));
1237
1238 /* tx_errors count up */
1239 ndev->stats.tx_errors++;
1240
1241 schedule_work(&priv->work);
1242}
1243
1244static void ravb_tx_timeout_work(struct work_struct *work)
1245{
1246 struct ravb_private *priv = container_of(work, struct ravb_private,
1247 work);
1248 struct net_device *ndev = priv->ndev;
1249
1250 netif_tx_stop_all_queues(ndev);
1251
1252 /* Stop PTP Clock driver */
1253 ravb_ptp_stop(ndev);
1254
1255 /* Wait for DMA stopping */
1256 ravb_stop_dma(ndev);
1257
1258 ravb_ring_free(ndev, RAVB_BE);
1259 ravb_ring_free(ndev, RAVB_NC);
1260
1261 /* Device init */
1262 ravb_dmac_init(ndev);
1263 ravb_emac_init(ndev);
1264
1265 /* Initialise PTP Clock driver */
1266 ravb_ptp_init(ndev, priv->pdev);
1267
1268 netif_tx_start_all_queues(ndev);
1269}
1270
1271/* Packet transmit function for Ethernet AVB */
1272static netdev_tx_t ravb_start_xmit(struct sk_buff *skb, struct net_device *ndev)
1273{
1274 struct ravb_private *priv = netdev_priv(ndev);
1275 struct ravb_tstamp_skb *ts_skb = NULL;
1276 u16 q = skb_get_queue_mapping(skb);
1277 struct ravb_tx_desc *desc;
1278 unsigned long flags;
1279 u32 dma_addr;
1280 void *buffer;
1281 u32 entry;
1282 u32 tccr;
1283
1284 spin_lock_irqsave(&priv->lock, flags);
1285 if (priv->cur_tx[q] - priv->dirty_tx[q] >= priv->num_tx_ring[q]) {
1286 netif_err(priv, tx_queued, ndev,
1287 "still transmitting with the full ring!\n");
1288 netif_stop_subqueue(ndev, q);
1289 spin_unlock_irqrestore(&priv->lock, flags);
1290 return NETDEV_TX_BUSY;
1291 }
1292 entry = priv->cur_tx[q] % priv->num_tx_ring[q];
1293 priv->tx_skb[q][entry] = skb;
1294
1295 if (skb_put_padto(skb, ETH_ZLEN))
1296 goto drop;
1297
1298 buffer = PTR_ALIGN(priv->tx_buffers[q][entry], RAVB_ALIGN);
1299 memcpy(buffer, skb->data, skb->len);
1300 desc = &priv->tx_ring[q][entry];
1301 desc->ds_tagl = cpu_to_le16(skb->len);
1302 dma_addr = dma_map_single(&ndev->dev, buffer, skb->len, DMA_TO_DEVICE);
1303 if (dma_mapping_error(&ndev->dev, dma_addr))
1304 goto drop;
1305 desc->dptr = cpu_to_le32(dma_addr);
1306
1307 /* TX timestamp required */
1308 if (q == RAVB_NC) {
1309 ts_skb = kmalloc(sizeof(*ts_skb), GFP_ATOMIC);
1310 if (!ts_skb) {
1311 dma_unmap_single(&ndev->dev, dma_addr, skb->len,
1312 DMA_TO_DEVICE);
1313 goto drop;
1314 }
1315 ts_skb->skb = skb;
1316 ts_skb->tag = priv->ts_skb_tag++;
1317 priv->ts_skb_tag &= 0x3ff;
1318 list_add_tail(&ts_skb->list, &priv->ts_skb_list);
1319
1320 /* TAG and timestamp required flag */
1321 skb_shinfo(skb)->tx_flags |= SKBTX_IN_PROGRESS;
1322 skb_tx_timestamp(skb);
1323 desc->tagh_tsr = (ts_skb->tag >> 4) | TX_TSR;
1324 desc->ds_tagl |= le16_to_cpu(ts_skb->tag << 12);
1325 }
1326
1327 /* Descriptor type must be set after all the above writes */
1328 dma_wmb();
1329 desc->die_dt = DT_FSINGLE;
1330
1331 tccr = ravb_read(ndev, TCCR);
1332 if (!(tccr & (TCCR_TSRQ0 << q)))
1333 ravb_write(ndev, tccr | (TCCR_TSRQ0 << q), TCCR);
1334
1335 priv->cur_tx[q]++;
1336 if (priv->cur_tx[q] - priv->dirty_tx[q] >= priv->num_tx_ring[q] &&
1337 !ravb_tx_free(ndev, q))
1338 netif_stop_subqueue(ndev, q);
1339
1340exit:
1341 mmiowb();
1342 spin_unlock_irqrestore(&priv->lock, flags);
1343 return NETDEV_TX_OK;
1344
1345drop:
1346 dev_kfree_skb_any(skb);
1347 priv->tx_skb[q][entry] = NULL;
1348 goto exit;
1349}
1350
1351static u16 ravb_select_queue(struct net_device *ndev, struct sk_buff *skb,
1352 void *accel_priv, select_queue_fallback_t fallback)
1353{
1354 /* If skb needs TX timestamp, it is handled in network control queue */
1355 return (skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP) ? RAVB_NC :
1356 RAVB_BE;
1357
1358}
1359
1360static struct net_device_stats *ravb_get_stats(struct net_device *ndev)
1361{
1362 struct ravb_private *priv = netdev_priv(ndev);
1363 struct net_device_stats *nstats, *stats0, *stats1;
1364
1365 nstats = &ndev->stats;
1366 stats0 = &priv->stats[RAVB_BE];
1367 stats1 = &priv->stats[RAVB_NC];
1368
1369 nstats->tx_dropped += ravb_read(ndev, TROCR);
1370 ravb_write(ndev, 0, TROCR); /* (write clear) */
1371 nstats->collisions += ravb_read(ndev, CDCR);
1372 ravb_write(ndev, 0, CDCR); /* (write clear) */
1373 nstats->tx_carrier_errors += ravb_read(ndev, LCCR);
1374 ravb_write(ndev, 0, LCCR); /* (write clear) */
1375
1376 nstats->tx_carrier_errors += ravb_read(ndev, CERCR);
1377 ravb_write(ndev, 0, CERCR); /* (write clear) */
1378 nstats->tx_carrier_errors += ravb_read(ndev, CEECR);
1379 ravb_write(ndev, 0, CEECR); /* (write clear) */
1380
1381 nstats->rx_packets = stats0->rx_packets + stats1->rx_packets;
1382 nstats->tx_packets = stats0->tx_packets + stats1->tx_packets;
1383 nstats->rx_bytes = stats0->rx_bytes + stats1->rx_bytes;
1384 nstats->tx_bytes = stats0->tx_bytes + stats1->tx_bytes;
1385 nstats->multicast = stats0->multicast + stats1->multicast;
1386 nstats->rx_errors = stats0->rx_errors + stats1->rx_errors;
1387 nstats->rx_crc_errors = stats0->rx_crc_errors + stats1->rx_crc_errors;
1388 nstats->rx_frame_errors =
1389 stats0->rx_frame_errors + stats1->rx_frame_errors;
1390 nstats->rx_length_errors =
1391 stats0->rx_length_errors + stats1->rx_length_errors;
1392 nstats->rx_missed_errors =
1393 stats0->rx_missed_errors + stats1->rx_missed_errors;
1394 nstats->rx_over_errors =
1395 stats0->rx_over_errors + stats1->rx_over_errors;
1396
1397 return nstats;
1398}
1399
1400/* Update promiscuous bit */
1401static void ravb_set_rx_mode(struct net_device *ndev)
1402{
1403 struct ravb_private *priv = netdev_priv(ndev);
1404 unsigned long flags;
1405 u32 ecmr;
1406
1407 spin_lock_irqsave(&priv->lock, flags);
1408 ecmr = ravb_read(ndev, ECMR);
1409 if (ndev->flags & IFF_PROMISC)
1410 ecmr |= ECMR_PRM;
1411 else
1412 ecmr &= ~ECMR_PRM;
1413 ravb_write(ndev, ecmr, ECMR);
1414 mmiowb();
1415 spin_unlock_irqrestore(&priv->lock, flags);
1416}
1417
1418/* Device close function for Ethernet AVB */
1419static int ravb_close(struct net_device *ndev)
1420{
1421 struct ravb_private *priv = netdev_priv(ndev);
1422 struct ravb_tstamp_skb *ts_skb, *ts_skb2;
1423
1424 netif_tx_stop_all_queues(ndev);
1425
1426 /* Disable interrupts by clearing the interrupt masks. */
1427 ravb_write(ndev, 0, RIC0);
1428 ravb_write(ndev, 0, RIC1);
1429 ravb_write(ndev, 0, RIC2);
1430 ravb_write(ndev, 0, TIC);
1431
1432 /* Stop PTP Clock driver */
1433 ravb_ptp_stop(ndev);
1434
1435 /* Set the config mode to stop the AVB-DMAC's processes */
1436 if (ravb_stop_dma(ndev) < 0)
1437 netdev_err(ndev,
1438 "device will be stopped after h/w processes are done.\n");
1439
1440 /* Clear the timestamp list */
1441 list_for_each_entry_safe(ts_skb, ts_skb2, &priv->ts_skb_list, list) {
1442 list_del(&ts_skb->list);
1443 kfree(ts_skb);
1444 }
1445
1446 /* PHY disconnect */
1447 if (priv->phydev) {
1448 phy_stop(priv->phydev);
1449 phy_disconnect(priv->phydev);
1450 priv->phydev = NULL;
1451 }
1452
1453 free_irq(ndev->irq, ndev);
1454
1455 napi_disable(&priv->napi[RAVB_NC]);
1456 napi_disable(&priv->napi[RAVB_BE]);
1457
1458 /* Free all the skb's in the RX queue and the DMA buffers. */
1459 ravb_ring_free(ndev, RAVB_BE);
1460 ravb_ring_free(ndev, RAVB_NC);
1461
1462 return 0;
1463}
1464
1465static int ravb_hwtstamp_get(struct net_device *ndev, struct ifreq *req)
1466{
1467 struct ravb_private *priv = netdev_priv(ndev);
1468 struct hwtstamp_config config;
1469
1470 config.flags = 0;
1471 config.tx_type = priv->tstamp_tx_ctrl ? HWTSTAMP_TX_ON :
1472 HWTSTAMP_TX_OFF;
1473 if (priv->tstamp_rx_ctrl & RAVB_RXTSTAMP_TYPE_V2_L2_EVENT)
1474 config.rx_filter = HWTSTAMP_FILTER_PTP_V2_L2_EVENT;
1475 else if (priv->tstamp_rx_ctrl & RAVB_RXTSTAMP_TYPE_ALL)
1476 config.rx_filter = HWTSTAMP_FILTER_ALL;
1477 else
1478 config.rx_filter = HWTSTAMP_FILTER_NONE;
1479
1480 return copy_to_user(req->ifr_data, &config, sizeof(config)) ?
1481 -EFAULT : 0;
1482}
1483
1484/* Control hardware time stamping */
1485static int ravb_hwtstamp_set(struct net_device *ndev, struct ifreq *req)
1486{
1487 struct ravb_private *priv = netdev_priv(ndev);
1488 struct hwtstamp_config config;
1489 u32 tstamp_rx_ctrl = RAVB_RXTSTAMP_ENABLED;
1490 u32 tstamp_tx_ctrl;
1491
1492 if (copy_from_user(&config, req->ifr_data, sizeof(config)))
1493 return -EFAULT;
1494
1495 /* Reserved for future extensions */
1496 if (config.flags)
1497 return -EINVAL;
1498
1499 switch (config.tx_type) {
1500 case HWTSTAMP_TX_OFF:
1501 tstamp_tx_ctrl = 0;
1502 break;
1503 case HWTSTAMP_TX_ON:
1504 tstamp_tx_ctrl = RAVB_TXTSTAMP_ENABLED;
1505 break;
1506 default:
1507 return -ERANGE;
1508 }
1509
1510 switch (config.rx_filter) {
1511 case HWTSTAMP_FILTER_NONE:
1512 tstamp_rx_ctrl = 0;
1513 break;
1514 case HWTSTAMP_FILTER_PTP_V2_L2_EVENT:
1515 tstamp_rx_ctrl |= RAVB_RXTSTAMP_TYPE_V2_L2_EVENT;
1516 break;
1517 default:
1518 config.rx_filter = HWTSTAMP_FILTER_ALL;
1519 tstamp_rx_ctrl |= RAVB_RXTSTAMP_TYPE_ALL;
1520 }
1521
1522 priv->tstamp_tx_ctrl = tstamp_tx_ctrl;
1523 priv->tstamp_rx_ctrl = tstamp_rx_ctrl;
1524
1525 return copy_to_user(req->ifr_data, &config, sizeof(config)) ?
1526 -EFAULT : 0;
1527}
1528
1529/* ioctl to device function */
1530static int ravb_do_ioctl(struct net_device *ndev, struct ifreq *req, int cmd)
1531{
1532 struct ravb_private *priv = netdev_priv(ndev);
1533 struct phy_device *phydev = priv->phydev;
1534
1535 if (!netif_running(ndev))
1536 return -EINVAL;
1537
1538 if (!phydev)
1539 return -ENODEV;
1540
1541 switch (cmd) {
1542 case SIOCGHWTSTAMP:
1543 return ravb_hwtstamp_get(ndev, req);
1544 case SIOCSHWTSTAMP:
1545 return ravb_hwtstamp_set(ndev, req);
1546 }
1547
1548 return phy_mii_ioctl(phydev, req, cmd);
1549}
1550
1551static const struct net_device_ops ravb_netdev_ops = {
1552 .ndo_open = ravb_open,
1553 .ndo_stop = ravb_close,
1554 .ndo_start_xmit = ravb_start_xmit,
1555 .ndo_select_queue = ravb_select_queue,
1556 .ndo_get_stats = ravb_get_stats,
1557 .ndo_set_rx_mode = ravb_set_rx_mode,
1558 .ndo_tx_timeout = ravb_tx_timeout,
1559 .ndo_do_ioctl = ravb_do_ioctl,
1560 .ndo_validate_addr = eth_validate_addr,
1561 .ndo_set_mac_address = eth_mac_addr,
1562 .ndo_change_mtu = eth_change_mtu,
1563};
1564
1565/* MDIO bus init function */
1566static int ravb_mdio_init(struct ravb_private *priv)
1567{
1568 struct platform_device *pdev = priv->pdev;
1569 struct device *dev = &pdev->dev;
1570 int error;
1571
1572 /* Bitbang init */
1573 priv->mdiobb.ops = &bb_ops;
1574
1575 /* MII controller setting */
1576 priv->mii_bus = alloc_mdio_bitbang(&priv->mdiobb);
1577 if (!priv->mii_bus)
1578 return -ENOMEM;
1579
1580 /* Hook up MII support for ethtool */
1581 priv->mii_bus->name = "ravb_mii";
1582 priv->mii_bus->parent = dev;
1583 snprintf(priv->mii_bus->id, MII_BUS_ID_SIZE, "%s-%x",
1584 pdev->name, pdev->id);
1585
1586 /* Register MDIO bus */
1587 error = of_mdiobus_register(priv->mii_bus, dev->of_node);
1588 if (error)
1589 goto out_free_bus;
1590
1591 return 0;
1592
1593out_free_bus:
1594 free_mdio_bitbang(priv->mii_bus);
1595 return error;
1596}
1597
1598/* MDIO bus release function */
1599static int ravb_mdio_release(struct ravb_private *priv)
1600{
1601 /* Unregister mdio bus */
1602 mdiobus_unregister(priv->mii_bus);
1603
1604 /* Free bitbang info */
1605 free_mdio_bitbang(priv->mii_bus);
1606
1607 return 0;
1608}
1609
1610static int ravb_probe(struct platform_device *pdev)
1611{
1612 struct device_node *np = pdev->dev.of_node;
1613 struct ravb_private *priv;
1614 struct net_device *ndev;
1615 int error, irq, q;
1616 struct resource *res;
1617
1618 if (!np) {
1619 dev_err(&pdev->dev,
1620 "this driver is required to be instantiated from device tree\n");
1621 return -EINVAL;
1622 }
1623
1624 /* Get base address */
1625 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1626 if (!res) {
1627 dev_err(&pdev->dev, "invalid resource\n");
1628 return -EINVAL;
1629 }
1630
1631 ndev = alloc_etherdev_mqs(sizeof(struct ravb_private),
1632 NUM_TX_QUEUE, NUM_RX_QUEUE);
1633 if (!ndev)
1634 return -ENOMEM;
1635
1636 pm_runtime_enable(&pdev->dev);
1637 pm_runtime_get_sync(&pdev->dev);
1638
1639 /* The Ether-specific entries in the device structure. */
1640 ndev->base_addr = res->start;
1641 ndev->dma = -1;
1642 irq = platform_get_irq(pdev, 0);
1643 if (irq < 0) {
1644 error = -ENODEV;
1645 goto out_release;
1646 }
1647 ndev->irq = irq;
1648
1649 SET_NETDEV_DEV(ndev, &pdev->dev);
1650
1651 priv = netdev_priv(ndev);
1652 priv->ndev = ndev;
1653 priv->pdev = pdev;
1654 priv->num_tx_ring[RAVB_BE] = BE_TX_RING_SIZE;
1655 priv->num_rx_ring[RAVB_BE] = BE_RX_RING_SIZE;
1656 priv->num_tx_ring[RAVB_NC] = NC_TX_RING_SIZE;
1657 priv->num_rx_ring[RAVB_NC] = NC_RX_RING_SIZE;
1658 priv->addr = devm_ioremap_resource(&pdev->dev, res);
1659 if (IS_ERR(priv->addr)) {
1660 error = PTR_ERR(priv->addr);
1661 goto out_release;
1662 }
1663
1664 spin_lock_init(&priv->lock);
1665 INIT_WORK(&priv->work, ravb_tx_timeout_work);
1666
1667 priv->phy_interface = of_get_phy_mode(np);
1668
1669 priv->no_avb_link = of_property_read_bool(np, "renesas,no-ether-link");
1670 priv->avb_link_active_low =
1671 of_property_read_bool(np, "renesas,ether-link-active-low");
1672
1673 /* Set function */
1674 ndev->netdev_ops = &ravb_netdev_ops;
1675 ndev->ethtool_ops = &ravb_ethtool_ops;
1676
1677 /* Set AVB config mode */
1678 ravb_write(ndev, (ravb_read(ndev, CCC) & ~CCC_OPC) | CCC_OPC_CONFIG,
1679 CCC);
1680
1681 /* Set CSEL value */
1682 ravb_write(ndev, (ravb_read(ndev, CCC) & ~CCC_CSEL) | CCC_CSEL_HPB,
1683 CCC);
1684
1685 /* Set GTI value */
1686 ravb_write(ndev, ((1000 << 20) / 130) & GTI_TIV, GTI);
1687
1688 /* Request GTI loading */
1689 ravb_write(ndev, ravb_read(ndev, GCCR) | GCCR_LTI, GCCR);
1690
1691 /* Allocate descriptor base address table */
1692 priv->desc_bat_size = sizeof(struct ravb_desc) * DBAT_ENTRY_NUM;
1693 priv->desc_bat = dma_alloc_coherent(NULL, priv->desc_bat_size,
1694 &priv->desc_bat_dma, GFP_KERNEL);
1695 if (!priv->desc_bat) {
1696 dev_err(&ndev->dev,
1697 "Cannot allocate desc base address table (size %d bytes)\n",
1698 priv->desc_bat_size);
1699 error = -ENOMEM;
1700 goto out_release;
1701 }
1702 for (q = RAVB_BE; q < DBAT_ENTRY_NUM; q++)
1703 priv->desc_bat[q].die_dt = DT_EOS;
1704 ravb_write(ndev, priv->desc_bat_dma, DBAT);
1705
1706 /* Initialise HW timestamp list */
1707 INIT_LIST_HEAD(&priv->ts_skb_list);
1708
1709 /* Debug message level */
1710 priv->msg_enable = RAVB_DEF_MSG_ENABLE;
1711
1712 /* Read and set MAC address */
1713 ravb_read_mac_address(ndev, of_get_mac_address(np));
1714 if (!is_valid_ether_addr(ndev->dev_addr)) {
1715 dev_warn(&pdev->dev,
1716 "no valid MAC address supplied, using a random one\n");
1717 eth_hw_addr_random(ndev);
1718 }
1719
1720 /* MDIO bus init */
1721 error = ravb_mdio_init(priv);
1722 if (error) {
1723 dev_err(&ndev->dev, "failed to initialize MDIO\n");
1724 goto out_dma_free;
1725 }
1726
1727 netif_napi_add(ndev, &priv->napi[RAVB_BE], ravb_poll, 64);
1728 netif_napi_add(ndev, &priv->napi[RAVB_NC], ravb_poll, 64);
1729
1730 /* Network device register */
1731 error = register_netdev(ndev);
1732 if (error)
1733 goto out_napi_del;
1734
1735 /* Print device information */
1736 netdev_info(ndev, "Base address at %#x, %pM, IRQ %d.\n",
1737 (u32)ndev->base_addr, ndev->dev_addr, ndev->irq);
1738
1739 platform_set_drvdata(pdev, ndev);
1740
1741 return 0;
1742
1743out_napi_del:
1744 netif_napi_del(&priv->napi[RAVB_NC]);
1745 netif_napi_del(&priv->napi[RAVB_BE]);
1746 ravb_mdio_release(priv);
1747out_dma_free:
1748 dma_free_coherent(NULL, priv->desc_bat_size, priv->desc_bat,
1749 priv->desc_bat_dma);
1750out_release:
1751 if (ndev)
1752 free_netdev(ndev);
1753
1754 pm_runtime_put(&pdev->dev);
1755 pm_runtime_disable(&pdev->dev);
1756 return error;
1757}
1758
1759static int ravb_remove(struct platform_device *pdev)
1760{
1761 struct net_device *ndev = platform_get_drvdata(pdev);
1762 struct ravb_private *priv = netdev_priv(ndev);
1763
1764 dma_free_coherent(NULL, priv->desc_bat_size, priv->desc_bat,
1765 priv->desc_bat_dma);
1766 /* Set reset mode */
1767 ravb_write(ndev, CCC_OPC_RESET, CCC);
1768 pm_runtime_put_sync(&pdev->dev);
1769 unregister_netdev(ndev);
1770 netif_napi_del(&priv->napi[RAVB_NC]);
1771 netif_napi_del(&priv->napi[RAVB_BE]);
1772 ravb_mdio_release(priv);
1773 pm_runtime_disable(&pdev->dev);
1774 free_netdev(ndev);
1775 platform_set_drvdata(pdev, NULL);
1776
1777 return 0;
1778}
1779
1780#ifdef CONFIG_PM
1781static int ravb_runtime_nop(struct device *dev)
1782{
1783 /* Runtime PM callback shared between ->runtime_suspend()
1784 * and ->runtime_resume(). Simply returns success.
1785 *
1786 * This driver re-initializes all registers after
1787 * pm_runtime_get_sync() anyway so there is no need
1788 * to save and restore registers here.
1789 */
1790 return 0;
1791}
1792
1793static const struct dev_pm_ops ravb_dev_pm_ops = {
1794 .runtime_suspend = ravb_runtime_nop,
1795 .runtime_resume = ravb_runtime_nop,
1796};
1797
1798#define RAVB_PM_OPS (&ravb_dev_pm_ops)
1799#else
1800#define RAVB_PM_OPS NULL
1801#endif
1802
1803static const struct of_device_id ravb_match_table[] = {
1804 { .compatible = "renesas,etheravb-r8a7790" },
1805 { .compatible = "renesas,etheravb-r8a7794" },
1806 { }
1807};
1808MODULE_DEVICE_TABLE(of, ravb_match_table);
1809
1810static struct platform_driver ravb_driver = {
1811 .probe = ravb_probe,
1812 .remove = ravb_remove,
1813 .driver = {
1814 .name = "ravb",
1815 .pm = RAVB_PM_OPS,
1816 .of_match_table = ravb_match_table,
1817 },
1818};
1819
1820module_platform_driver(ravb_driver);
1821
1822MODULE_AUTHOR("Mitsuhiro Kimura, Masaru Nagai");
1823MODULE_DESCRIPTION("Renesas Ethernet AVB driver");
1824MODULE_LICENSE("GPL v2");
generated by cgit v1.2.2 (git 2.25.0) at 2025-02-26 10:32:06 -0500