1 // SPDX-License-Identifier: GPL-2.0-only
3 * This contains the functions to handle the descriptors for DesignWare databook
6 * Copyright (C) 2015 STMicroelectronics Ltd
8 * Author: Alexandre Torgue <alexandre.torgue@st.com>
11 #include <linux/stmmac.h>
14 #include "dwmac4_descs.h"
16 static int dwmac4_wrback_get_tx_status(void *data, struct stmmac_extra_stats *x,
20 struct net_device_stats *stats = (struct net_device_stats *)data;
24 tdes3 = le32_to_cpu(p->des3);
26 /* Get tx owner first */
27 if (unlikely(tdes3 & TDES3_OWN))
30 /* Verify tx error by looking at the last segment. */
31 if (likely(!(tdes3 & TDES3_LAST_DESCRIPTOR)))
34 if (unlikely(tdes3 & TDES3_ERROR_SUMMARY)) {
35 if (unlikely(tdes3 & TDES3_JABBER_TIMEOUT))
37 if (unlikely(tdes3 & TDES3_PACKET_FLUSHED))
38 x->tx_frame_flushed++;
39 if (unlikely(tdes3 & TDES3_LOSS_CARRIER)) {
41 stats->tx_carrier_errors++;
43 if (unlikely(tdes3 & TDES3_NO_CARRIER)) {
45 stats->tx_carrier_errors++;
47 if (unlikely((tdes3 & TDES3_LATE_COLLISION) ||
48 (tdes3 & TDES3_EXCESSIVE_COLLISION)))
50 (tdes3 & TDES3_COLLISION_COUNT_MASK)
51 >> TDES3_COLLISION_COUNT_SHIFT;
53 if (unlikely(tdes3 & TDES3_EXCESSIVE_DEFERRAL))
56 if (unlikely(tdes3 & TDES3_UNDERFLOW_ERROR))
59 if (unlikely(tdes3 & TDES3_IP_HDR_ERROR))
60 x->tx_ip_header_error++;
62 if (unlikely(tdes3 & TDES3_PAYLOAD_ERROR))
63 x->tx_payload_error++;
68 if (unlikely(tdes3 & TDES3_DEFERRED))
74 static int dwmac4_wrback_get_rx_status(void *data, struct stmmac_extra_stats *x,
77 struct net_device_stats *stats = (struct net_device_stats *)data;
78 unsigned int rdes1 = le32_to_cpu(p->des1);
79 unsigned int rdes2 = le32_to_cpu(p->des2);
80 unsigned int rdes3 = le32_to_cpu(p->des3);
84 if (unlikely(rdes3 & RDES3_OWN))
87 if (unlikely(rdes3 & RDES3_CONTEXT_DESCRIPTOR))
89 if (likely(!(rdes3 & RDES3_LAST_DESCRIPTOR)))
92 if (unlikely(rdes3 & RDES3_ERROR_SUMMARY)) {
93 if (unlikely(rdes3 & RDES3_GIANT_PACKET))
94 stats->rx_length_errors++;
95 if (unlikely(rdes3 & RDES3_OVERFLOW_ERROR))
96 x->rx_gmac_overflow++;
98 if (unlikely(rdes3 & RDES3_RECEIVE_WATCHDOG))
101 if (unlikely(rdes3 & RDES3_RECEIVE_ERROR))
104 if (unlikely(rdes3 & RDES3_CRC_ERROR)) {
106 stats->rx_crc_errors++;
109 if (unlikely(rdes3 & RDES3_DRIBBLE_ERROR))
115 message_type = (rdes1 & ERDES4_MSG_TYPE_MASK) >> 8;
117 if (rdes1 & RDES1_IP_HDR_ERROR)
119 if (rdes1 & RDES1_IP_CSUM_BYPASSED)
120 x->ip_csum_bypassed++;
121 if (rdes1 & RDES1_IPV4_HEADER)
123 if (rdes1 & RDES1_IPV6_HEADER)
126 if (message_type == RDES_EXT_NO_PTP)
127 x->no_ptp_rx_msg_type_ext++;
128 else if (message_type == RDES_EXT_SYNC)
129 x->ptp_rx_msg_type_sync++;
130 else if (message_type == RDES_EXT_FOLLOW_UP)
131 x->ptp_rx_msg_type_follow_up++;
132 else if (message_type == RDES_EXT_DELAY_REQ)
133 x->ptp_rx_msg_type_delay_req++;
134 else if (message_type == RDES_EXT_DELAY_RESP)
135 x->ptp_rx_msg_type_delay_resp++;
136 else if (message_type == RDES_EXT_PDELAY_REQ)
137 x->ptp_rx_msg_type_pdelay_req++;
138 else if (message_type == RDES_EXT_PDELAY_RESP)
139 x->ptp_rx_msg_type_pdelay_resp++;
140 else if (message_type == RDES_EXT_PDELAY_FOLLOW_UP)
141 x->ptp_rx_msg_type_pdelay_follow_up++;
142 else if (message_type == RDES_PTP_ANNOUNCE)
143 x->ptp_rx_msg_type_announce++;
144 else if (message_type == RDES_PTP_MANAGEMENT)
145 x->ptp_rx_msg_type_management++;
146 else if (message_type == RDES_PTP_PKT_RESERVED_TYPE)
147 x->ptp_rx_msg_pkt_reserved_type++;
149 if (rdes1 & RDES1_PTP_PACKET_TYPE)
151 if (rdes1 & RDES1_PTP_VER)
153 if (rdes1 & RDES1_TIMESTAMP_DROPPED)
154 x->timestamp_dropped++;
156 if (unlikely(rdes2 & RDES2_SA_FILTER_FAIL)) {
157 x->sa_rx_filter_fail++;
160 if (unlikely(rdes2 & RDES2_DA_FILTER_FAIL)) {
161 x->da_rx_filter_fail++;
165 if (rdes2 & RDES2_L3_FILTER_MATCH)
166 x->l3_filter_match++;
167 if (rdes2 & RDES2_L4_FILTER_MATCH)
168 x->l4_filter_match++;
169 if ((rdes2 & RDES2_L3_L4_FILT_NB_MATCH_MASK)
170 >> RDES2_L3_L4_FILT_NB_MATCH_SHIFT)
171 x->l3_l4_filter_no_match++;
176 static int dwmac4_rd_get_tx_len(struct dma_desc *p)
178 return (le32_to_cpu(p->des2) & TDES2_BUFFER1_SIZE_MASK);
181 static int dwmac4_get_tx_owner(struct dma_desc *p)
183 return (le32_to_cpu(p->des3) & TDES3_OWN) >> TDES3_OWN_SHIFT;
186 static void dwmac4_set_tx_owner(struct dma_desc *p)
188 p->des3 |= cpu_to_le32(TDES3_OWN);
191 static void dwmac4_set_rx_owner(struct dma_desc *p, int disable_rx_ic)
193 p->des3 |= cpu_to_le32(RDES3_OWN | RDES3_BUFFER1_VALID_ADDR);
196 p->des3 |= cpu_to_le32(RDES3_INT_ON_COMPLETION_EN);
199 static int dwmac4_get_tx_ls(struct dma_desc *p)
201 return (le32_to_cpu(p->des3) & TDES3_LAST_DESCRIPTOR)
202 >> TDES3_LAST_DESCRIPTOR_SHIFT;
205 static int dwmac4_wrback_get_rx_frame_len(struct dma_desc *p, int rx_coe)
207 return (le32_to_cpu(p->des3) & RDES3_PACKET_SIZE_MASK);
210 static void dwmac4_rd_enable_tx_timestamp(struct dma_desc *p)
212 p->des2 |= cpu_to_le32(TDES2_TIMESTAMP_ENABLE);
215 static int dwmac4_wrback_get_tx_timestamp_status(struct dma_desc *p)
217 /* Context type from W/B descriptor must be zero */
218 if (le32_to_cpu(p->des3) & TDES3_CONTEXT_TYPE)
221 /* Tx Timestamp Status is 1 so des0 and des1'll have valid values */
222 if (le32_to_cpu(p->des3) & TDES3_TIMESTAMP_STATUS)
228 static inline void dwmac4_get_timestamp(void *desc, u32 ats, u64 *ts)
230 struct dma_desc *p = (struct dma_desc *)desc;
233 ns = le32_to_cpu(p->des0);
234 /* convert high/sec time stamp value to nanosecond */
235 ns += le32_to_cpu(p->des1) * 1000000000ULL;
240 static int dwmac4_rx_check_timestamp(void *desc)
242 struct dma_desc *p = (struct dma_desc *)desc;
243 unsigned int rdes0 = le32_to_cpu(p->des0);
244 unsigned int rdes1 = le32_to_cpu(p->des1);
245 unsigned int rdes3 = le32_to_cpu(p->des3);
249 own = rdes3 & RDES3_OWN;
250 ctxt = ((rdes3 & RDES3_CONTEXT_DESCRIPTOR)
251 >> RDES3_CONTEXT_DESCRIPTOR_SHIFT);
253 if (likely(!own && ctxt)) {
254 if ((rdes0 == 0xffffffff) && (rdes1 == 0xffffffff))
255 /* Corrupted value */
258 /* A valid Timestamp is ready to be read */
262 /* Timestamp not ready */
266 static int dwmac4_wrback_get_rx_timestamp_status(void *desc, void *next_desc,
269 struct dma_desc *p = (struct dma_desc *)desc;
272 /* Get the status from normal w/b descriptor */
273 if (likely(le32_to_cpu(p->des3) & RDES3_RDES1_VALID)) {
274 if (likely(le32_to_cpu(p->des1) & RDES1_TIMESTAMP_AVAILABLE)) {
277 /* Check if timestamp is OK from context descriptor */
279 ret = dwmac4_rx_check_timestamp(next_desc);
284 } while ((ret == 1) && (i < 10));
291 if (likely(ret == 0))
297 static void dwmac4_rd_init_rx_desc(struct dma_desc *p, int disable_rx_ic,
298 int mode, int end, int bfsize)
300 dwmac4_set_rx_owner(p, disable_rx_ic);
303 static void dwmac4_rd_init_tx_desc(struct dma_desc *p, int mode, int end)
311 static void dwmac4_rd_prepare_tx_desc(struct dma_desc *p, int is_fs, int len,
312 bool csum_flag, int mode, bool tx_own,
313 bool ls, unsigned int tot_pkt_len)
315 unsigned int tdes3 = le32_to_cpu(p->des3);
317 p->des2 |= cpu_to_le32(len & TDES2_BUFFER1_SIZE_MASK);
319 tdes3 |= tot_pkt_len & TDES3_PACKET_SIZE_MASK;
321 tdes3 |= TDES3_FIRST_DESCRIPTOR;
323 tdes3 &= ~TDES3_FIRST_DESCRIPTOR;
325 if (likely(csum_flag))
326 tdes3 |= (TX_CIC_FULL << TDES3_CHECKSUM_INSERTION_SHIFT);
328 tdes3 &= ~(TX_CIC_FULL << TDES3_CHECKSUM_INSERTION_SHIFT);
331 tdes3 |= TDES3_LAST_DESCRIPTOR;
333 tdes3 &= ~TDES3_LAST_DESCRIPTOR;
335 /* Finally set the OWN bit. Later the DMA will start! */
340 /* When the own bit, for the first frame, has to be set, all
341 * descriptors for the same frame has to be set before, to
342 * avoid race condition.
346 p->des3 = cpu_to_le32(tdes3);
349 static void dwmac4_rd_prepare_tso_tx_desc(struct dma_desc *p, int is_fs,
350 int len1, int len2, bool tx_own,
351 bool ls, unsigned int tcphdrlen,
352 unsigned int tcppayloadlen)
354 unsigned int tdes3 = le32_to_cpu(p->des3);
357 p->des2 |= cpu_to_le32((len1 & TDES2_BUFFER1_SIZE_MASK));
360 p->des2 |= cpu_to_le32((len2 << TDES2_BUFFER2_SIZE_MASK_SHIFT)
361 & TDES2_BUFFER2_SIZE_MASK);
364 tdes3 |= TDES3_FIRST_DESCRIPTOR |
365 TDES3_TCP_SEGMENTATION_ENABLE |
366 ((tcphdrlen << TDES3_HDR_LEN_SHIFT) &
367 TDES3_SLOT_NUMBER_MASK) |
368 ((tcppayloadlen & TDES3_TCP_PKT_PAYLOAD_MASK));
370 tdes3 &= ~TDES3_FIRST_DESCRIPTOR;
374 tdes3 |= TDES3_LAST_DESCRIPTOR;
376 tdes3 &= ~TDES3_LAST_DESCRIPTOR;
378 /* Finally set the OWN bit. Later the DMA will start! */
383 /* When the own bit, for the first frame, has to be set, all
384 * descriptors for the same frame has to be set before, to
385 * avoid race condition.
389 p->des3 = cpu_to_le32(tdes3);
392 static void dwmac4_release_tx_desc(struct dma_desc *p, int mode)
400 static void dwmac4_rd_set_tx_ic(struct dma_desc *p)
402 p->des2 |= cpu_to_le32(TDES2_INTERRUPT_ON_COMPLETION);
405 static void dwmac4_display_ring(void *head, unsigned int size, bool rx)
407 struct dma_desc *p = (struct dma_desc *)head;
410 pr_info("%s descriptor ring:\n", rx ? "RX" : "TX");
412 for (i = 0; i < size; i++) {
413 pr_info("%03d [0x%x]: 0x%x 0x%x 0x%x 0x%x\n",
414 i, (unsigned int)virt_to_phys(p),
415 le32_to_cpu(p->des0), le32_to_cpu(p->des1),
416 le32_to_cpu(p->des2), le32_to_cpu(p->des3));
421 static void dwmac4_set_mss_ctxt(struct dma_desc *p, unsigned int mss)
425 p->des2 = cpu_to_le32(mss);
426 p->des3 = cpu_to_le32(TDES3_CONTEXT_TYPE | TDES3_CTXT_TCMSSV);
429 static void dwmac4_get_addr(struct dma_desc *p, unsigned int *addr)
431 *addr = le32_to_cpu(p->des0);
434 static void dwmac4_set_addr(struct dma_desc *p, dma_addr_t addr)
436 p->des0 = cpu_to_le32(lower_32_bits(addr));
437 p->des1 = cpu_to_le32(upper_32_bits(addr));
440 static void dwmac4_clear(struct dma_desc *p)
448 static void dwmac4_set_sarc(struct dma_desc *p, u32 sarc_type)
450 sarc_type <<= TDES3_SA_INSERT_CTRL_SHIFT;
452 p->des3 |= cpu_to_le32(sarc_type & TDES3_SA_INSERT_CTRL_MASK);
455 static int set_16kib_bfsize(int mtu)
459 if (unlikely(mtu >= BUF_SIZE_8KiB))
460 ret = BUF_SIZE_16KiB;
464 static void dwmac4_set_vlan_tag(struct dma_desc *p, u16 tag, u16 inner_tag,
474 u32 des = inner_tag << TDES2_IVT_SHIFT;
476 des &= TDES2_IVT_MASK;
477 p->des2 = cpu_to_le32(des);
479 des = inner_type << TDES3_IVTIR_SHIFT;
480 des &= TDES3_IVTIR_MASK;
481 p->des3 = cpu_to_le32(des | TDES3_IVLTV);
485 p->des3 |= cpu_to_le32(tag & TDES3_VLAN_TAG);
486 p->des3 |= cpu_to_le32(TDES3_VLTV);
488 p->des3 |= cpu_to_le32(TDES3_CONTEXT_TYPE);
491 static void dwmac4_set_vlan(struct dma_desc *p, u32 type)
493 type <<= TDES2_VLAN_TAG_SHIFT;
494 p->des2 |= cpu_to_le32(type & TDES2_VLAN_TAG_MASK);
497 static void dwmac4_get_rx_header_len(struct dma_desc *p, unsigned int *len)
499 *len = le32_to_cpu(p->des2) & RDES2_HL;
502 static void dwmac4_set_sec_addr(struct dma_desc *p, dma_addr_t addr)
504 p->des2 = cpu_to_le32(lower_32_bits(addr));
505 p->des3 = cpu_to_le32(upper_32_bits(addr) | RDES3_BUFFER2_VALID_ADDR);
508 static void dwmac4_set_tbs(struct dma_edesc *p, u32 sec, u32 nsec)
510 p->des4 = cpu_to_le32((sec & TDES4_LT) | TDES4_LTV);
511 p->des5 = cpu_to_le32(nsec & TDES5_LT);
516 const struct stmmac_desc_ops dwmac4_desc_ops = {
517 .tx_status = dwmac4_wrback_get_tx_status,
518 .rx_status = dwmac4_wrback_get_rx_status,
519 .get_tx_len = dwmac4_rd_get_tx_len,
520 .get_tx_owner = dwmac4_get_tx_owner,
521 .set_tx_owner = dwmac4_set_tx_owner,
522 .set_rx_owner = dwmac4_set_rx_owner,
523 .get_tx_ls = dwmac4_get_tx_ls,
524 .get_rx_frame_len = dwmac4_wrback_get_rx_frame_len,
525 .enable_tx_timestamp = dwmac4_rd_enable_tx_timestamp,
526 .get_tx_timestamp_status = dwmac4_wrback_get_tx_timestamp_status,
527 .get_rx_timestamp_status = dwmac4_wrback_get_rx_timestamp_status,
528 .get_timestamp = dwmac4_get_timestamp,
529 .set_tx_ic = dwmac4_rd_set_tx_ic,
530 .prepare_tx_desc = dwmac4_rd_prepare_tx_desc,
531 .prepare_tso_tx_desc = dwmac4_rd_prepare_tso_tx_desc,
532 .release_tx_desc = dwmac4_release_tx_desc,
533 .init_rx_desc = dwmac4_rd_init_rx_desc,
534 .init_tx_desc = dwmac4_rd_init_tx_desc,
535 .display_ring = dwmac4_display_ring,
536 .set_mss = dwmac4_set_mss_ctxt,
537 .get_addr = dwmac4_get_addr,
538 .set_addr = dwmac4_set_addr,
539 .clear = dwmac4_clear,
540 .set_sarc = dwmac4_set_sarc,
541 .set_vlan_tag = dwmac4_set_vlan_tag,
542 .set_vlan = dwmac4_set_vlan,
543 .get_rx_header_len = dwmac4_get_rx_header_len,
544 .set_sec_addr = dwmac4_set_sec_addr,
545 .set_tbs = dwmac4_set_tbs,
548 const struct stmmac_mode_ops dwmac4_ring_mode_ops = {
549 .set_16kib_bfsize = set_16kib_bfsize,