2 * This contains the functions to handle the descriptors for DesignWare databook
5 * Copyright (C) 2015 STMicroelectronics Ltd
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms and conditions of the GNU General Public License,
9 * version 2, as published by the Free Software Foundation.
11 * Author: Alexandre Torgue <alexandre.torgue@st.com>
14 #include <linux/stmmac.h>
16 #include "dwmac4_descs.h"
18 static int dwmac4_wrback_get_tx_status(void *data, struct stmmac_extra_stats *x,
22 struct net_device_stats *stats = (struct net_device_stats *)data;
26 tdes3 = le32_to_cpu(p->des3);
28 /* Get tx owner first */
29 if (unlikely(tdes3 & TDES3_OWN))
32 /* Verify tx error by looking at the last segment. */
33 if (likely(!(tdes3 & TDES3_LAST_DESCRIPTOR)))
36 if (unlikely(tdes3 & TDES3_ERROR_SUMMARY)) {
37 if (unlikely(tdes3 & TDES3_JABBER_TIMEOUT))
39 if (unlikely(tdes3 & TDES3_PACKET_FLUSHED))
40 x->tx_frame_flushed++;
41 if (unlikely(tdes3 & TDES3_LOSS_CARRIER)) {
43 stats->tx_carrier_errors++;
45 if (unlikely(tdes3 & TDES3_NO_CARRIER)) {
47 stats->tx_carrier_errors++;
49 if (unlikely((tdes3 & TDES3_LATE_COLLISION) ||
50 (tdes3 & TDES3_EXCESSIVE_COLLISION)))
52 (tdes3 & TDES3_COLLISION_COUNT_MASK)
53 >> TDES3_COLLISION_COUNT_SHIFT;
55 if (unlikely(tdes3 & TDES3_EXCESSIVE_DEFERRAL))
58 if (unlikely(tdes3 & TDES3_UNDERFLOW_ERROR))
61 if (unlikely(tdes3 & TDES3_IP_HDR_ERROR))
62 x->tx_ip_header_error++;
64 if (unlikely(tdes3 & TDES3_PAYLOAD_ERROR))
65 x->tx_payload_error++;
70 if (unlikely(tdes3 & TDES3_DEFERRED))
76 static int dwmac4_wrback_get_rx_status(void *data, struct stmmac_extra_stats *x,
79 struct net_device_stats *stats = (struct net_device_stats *)data;
80 unsigned int rdes1 = le32_to_cpu(p->des1);
81 unsigned int rdes2 = le32_to_cpu(p->des2);
82 unsigned int rdes3 = le32_to_cpu(p->des3);
86 if (unlikely(rdes3 & RDES3_OWN))
89 /* Verify rx error by looking at the last segment. */
90 if (likely(!(rdes3 & RDES3_LAST_DESCRIPTOR)))
93 if (unlikely(rdes3 & RDES3_ERROR_SUMMARY)) {
94 if (unlikely(rdes3 & RDES3_GIANT_PACKET))
95 stats->rx_length_errors++;
96 if (unlikely(rdes3 & RDES3_OVERFLOW_ERROR))
97 x->rx_gmac_overflow++;
99 if (unlikely(rdes3 & RDES3_RECEIVE_WATCHDOG))
102 if (unlikely(rdes3 & RDES3_RECEIVE_ERROR))
105 if (unlikely(rdes3 & RDES3_CRC_ERROR)) {
107 stats->rx_crc_errors++;
110 if (unlikely(rdes3 & RDES3_DRIBBLE_ERROR))
116 message_type = (rdes1 & ERDES4_MSG_TYPE_MASK) >> 8;
118 if (rdes1 & RDES1_IP_HDR_ERROR)
120 if (rdes1 & RDES1_IP_CSUM_BYPASSED)
121 x->ip_csum_bypassed++;
122 if (rdes1 & RDES1_IPV4_HEADER)
124 if (rdes1 & RDES1_IPV6_HEADER)
127 if (message_type == RDES_EXT_NO_PTP)
128 x->no_ptp_rx_msg_type_ext++;
129 else if (message_type == RDES_EXT_SYNC)
130 x->ptp_rx_msg_type_sync++;
131 else if (message_type == RDES_EXT_FOLLOW_UP)
132 x->ptp_rx_msg_type_follow_up++;
133 else if (message_type == RDES_EXT_DELAY_REQ)
134 x->ptp_rx_msg_type_delay_req++;
135 else if (message_type == RDES_EXT_DELAY_RESP)
136 x->ptp_rx_msg_type_delay_resp++;
137 else if (message_type == RDES_EXT_PDELAY_REQ)
138 x->ptp_rx_msg_type_pdelay_req++;
139 else if (message_type == RDES_EXT_PDELAY_RESP)
140 x->ptp_rx_msg_type_pdelay_resp++;
141 else if (message_type == RDES_EXT_PDELAY_FOLLOW_UP)
142 x->ptp_rx_msg_type_pdelay_follow_up++;
143 else if (message_type == RDES_PTP_ANNOUNCE)
144 x->ptp_rx_msg_type_announce++;
145 else if (message_type == RDES_PTP_MANAGEMENT)
146 x->ptp_rx_msg_type_management++;
147 else if (message_type == RDES_PTP_PKT_RESERVED_TYPE)
148 x->ptp_rx_msg_pkt_reserved_type++;
150 if (rdes1 & RDES1_PTP_PACKET_TYPE)
152 if (rdes1 & RDES1_PTP_VER)
154 if (rdes1 & RDES1_TIMESTAMP_DROPPED)
155 x->timestamp_dropped++;
157 if (unlikely(rdes2 & RDES2_SA_FILTER_FAIL)) {
158 x->sa_rx_filter_fail++;
161 if (unlikely(rdes2 & RDES2_DA_FILTER_FAIL)) {
162 x->da_rx_filter_fail++;
166 if (rdes2 & RDES2_L3_FILTER_MATCH)
167 x->l3_filter_match++;
168 if (rdes2 & RDES2_L4_FILTER_MATCH)
169 x->l4_filter_match++;
170 if ((rdes2 & RDES2_L3_L4_FILT_NB_MATCH_MASK)
171 >> RDES2_L3_L4_FILT_NB_MATCH_SHIFT)
172 x->l3_l4_filter_no_match++;
177 static int dwmac4_rd_get_tx_len(struct dma_desc *p)
179 return (le32_to_cpu(p->des2) & TDES2_BUFFER1_SIZE_MASK);
182 static int dwmac4_get_tx_owner(struct dma_desc *p)
184 return (le32_to_cpu(p->des3) & TDES3_OWN) >> TDES3_OWN_SHIFT;
187 static void dwmac4_set_tx_owner(struct dma_desc *p)
189 p->des3 |= cpu_to_le32(TDES3_OWN);
192 static void dwmac4_set_rx_owner(struct dma_desc *p)
194 p->des3 |= cpu_to_le32(RDES3_OWN);
197 static int dwmac4_get_tx_ls(struct dma_desc *p)
199 return (le32_to_cpu(p->des3) & TDES3_LAST_DESCRIPTOR)
200 >> TDES3_LAST_DESCRIPTOR_SHIFT;
203 static int dwmac4_wrback_get_rx_frame_len(struct dma_desc *p, int rx_coe)
205 return (le32_to_cpu(p->des3) & RDES3_PACKET_SIZE_MASK);
208 static void dwmac4_rd_enable_tx_timestamp(struct dma_desc *p)
210 p->des2 |= cpu_to_le32(TDES2_TIMESTAMP_ENABLE);
213 static int dwmac4_wrback_get_tx_timestamp_status(struct dma_desc *p)
215 /* Context type from W/B descriptor must be zero */
216 if (le32_to_cpu(p->des3) & TDES3_CONTEXT_TYPE)
219 /* Tx Timestamp Status is 1 so des0 and des1'll have valid values */
220 if (le32_to_cpu(p->des3) & TDES3_TIMESTAMP_STATUS)
226 static inline u64 dwmac4_get_timestamp(void *desc, u32 ats)
228 struct dma_desc *p = (struct dma_desc *)desc;
231 ns = le32_to_cpu(p->des0);
232 /* convert high/sec time stamp value to nanosecond */
233 ns += le32_to_cpu(p->des1) * 1000000000ULL;
238 static int dwmac4_rx_check_timestamp(void *desc)
240 struct dma_desc *p = (struct dma_desc *)desc;
244 own = p->des3 & RDES3_OWN;
245 ctxt = ((p->des3 & RDES3_CONTEXT_DESCRIPTOR)
246 >> RDES3_CONTEXT_DESCRIPTOR_SHIFT);
248 if (likely(!own && ctxt)) {
249 if ((p->des0 == 0xffffffff) && (p->des1 == 0xffffffff))
250 /* Corrupted value */
253 /* A valid Timestamp is ready to be read */
257 /* Timestamp not ready */
261 static int dwmac4_wrback_get_rx_timestamp_status(void *desc, void *next_desc,
264 struct dma_desc *p = (struct dma_desc *)desc;
267 /* Get the status from normal w/b descriptor */
268 if (likely(p->des3 & TDES3_RS1V)) {
269 if (likely(le32_to_cpu(p->des1) & RDES1_TIMESTAMP_AVAILABLE)) {
272 /* Check if timestamp is OK from context descriptor */
274 ret = dwmac4_rx_check_timestamp(next_desc);
279 } while ((ret == 1) && (i < 10));
286 if (likely(ret == 0))
292 static void dwmac4_rd_init_rx_desc(struct dma_desc *p, int disable_rx_ic,
295 p->des3 = cpu_to_le32(RDES3_OWN | RDES3_BUFFER1_VALID_ADDR);
298 p->des3 |= cpu_to_le32(RDES3_INT_ON_COMPLETION_EN);
301 static void dwmac4_rd_init_tx_desc(struct dma_desc *p, int mode, int end)
309 static void dwmac4_rd_prepare_tx_desc(struct dma_desc *p, int is_fs, int len,
310 bool csum_flag, int mode, bool tx_own,
311 bool ls, unsigned int tot_pkt_len)
313 unsigned int tdes3 = le32_to_cpu(p->des3);
315 p->des2 |= cpu_to_le32(len & TDES2_BUFFER1_SIZE_MASK);
317 tdes3 |= tot_pkt_len & TDES3_PACKET_SIZE_MASK;
319 tdes3 |= TDES3_FIRST_DESCRIPTOR;
321 tdes3 &= ~TDES3_FIRST_DESCRIPTOR;
323 if (likely(csum_flag))
324 tdes3 |= (TX_CIC_FULL << TDES3_CHECKSUM_INSERTION_SHIFT);
326 tdes3 &= ~(TX_CIC_FULL << TDES3_CHECKSUM_INSERTION_SHIFT);
329 tdes3 |= TDES3_LAST_DESCRIPTOR;
331 tdes3 &= ~TDES3_LAST_DESCRIPTOR;
333 /* Finally set the OWN bit. Later the DMA will start! */
338 /* When the own bit, for the first frame, has to be set, all
339 * descriptors for the same frame has to be set before, to
340 * avoid race condition.
344 p->des3 = cpu_to_le32(tdes3);
347 static void dwmac4_rd_prepare_tso_tx_desc(struct dma_desc *p, int is_fs,
348 int len1, int len2, bool tx_own,
349 bool ls, unsigned int tcphdrlen,
350 unsigned int tcppayloadlen)
352 unsigned int tdes3 = le32_to_cpu(p->des3);
355 p->des2 |= cpu_to_le32((len1 & TDES2_BUFFER1_SIZE_MASK));
358 p->des2 |= cpu_to_le32((len2 << TDES2_BUFFER2_SIZE_MASK_SHIFT)
359 & TDES2_BUFFER2_SIZE_MASK);
362 tdes3 |= TDES3_FIRST_DESCRIPTOR |
363 TDES3_TCP_SEGMENTATION_ENABLE |
364 ((tcphdrlen << TDES3_HDR_LEN_SHIFT) &
365 TDES3_SLOT_NUMBER_MASK) |
366 ((tcppayloadlen & TDES3_TCP_PKT_PAYLOAD_MASK));
368 tdes3 &= ~TDES3_FIRST_DESCRIPTOR;
372 tdes3 |= TDES3_LAST_DESCRIPTOR;
374 tdes3 &= ~TDES3_LAST_DESCRIPTOR;
376 /* Finally set the OWN bit. Later the DMA will start! */
381 /* When the own bit, for the first frame, has to be set, all
382 * descriptors for the same frame has to be set before, to
383 * avoid race condition.
387 p->des3 = cpu_to_le32(tdes3);
390 static void dwmac4_release_tx_desc(struct dma_desc *p, int mode)
396 static void dwmac4_rd_set_tx_ic(struct dma_desc *p)
398 p->des2 |= cpu_to_le32(TDES2_INTERRUPT_ON_COMPLETION);
401 static void dwmac4_display_ring(void *head, unsigned int size, bool rx)
403 struct dma_desc *p = (struct dma_desc *)head;
406 pr_info("%s descriptor ring:\n", rx ? "RX" : "TX");
408 for (i = 0; i < size; i++) {
409 pr_info("%d [0x%x]: 0x%x 0x%x 0x%x 0x%x\n",
410 i, (unsigned int)virt_to_phys(p),
411 le32_to_cpu(p->des0), le32_to_cpu(p->des1),
412 le32_to_cpu(p->des2), le32_to_cpu(p->des3));
417 static void dwmac4_set_mss_ctxt(struct dma_desc *p, unsigned int mss)
421 p->des2 = cpu_to_le32(mss);
422 p->des3 = cpu_to_le32(TDES3_CONTEXT_TYPE | TDES3_CTXT_TCMSSV);
425 const struct stmmac_desc_ops dwmac4_desc_ops = {
426 .tx_status = dwmac4_wrback_get_tx_status,
427 .rx_status = dwmac4_wrback_get_rx_status,
428 .get_tx_len = dwmac4_rd_get_tx_len,
429 .get_tx_owner = dwmac4_get_tx_owner,
430 .set_tx_owner = dwmac4_set_tx_owner,
431 .set_rx_owner = dwmac4_set_rx_owner,
432 .get_tx_ls = dwmac4_get_tx_ls,
433 .get_rx_frame_len = dwmac4_wrback_get_rx_frame_len,
434 .enable_tx_timestamp = dwmac4_rd_enable_tx_timestamp,
435 .get_tx_timestamp_status = dwmac4_wrback_get_tx_timestamp_status,
436 .get_rx_timestamp_status = dwmac4_wrback_get_rx_timestamp_status,
437 .get_timestamp = dwmac4_get_timestamp,
438 .set_tx_ic = dwmac4_rd_set_tx_ic,
439 .prepare_tx_desc = dwmac4_rd_prepare_tx_desc,
440 .prepare_tso_tx_desc = dwmac4_rd_prepare_tso_tx_desc,
441 .release_tx_desc = dwmac4_release_tx_desc,
442 .init_rx_desc = dwmac4_rd_init_rx_desc,
443 .init_tx_desc = dwmac4_rd_init_tx_desc,
444 .display_ring = dwmac4_display_ring,
445 .set_mss = dwmac4_set_mss_ctxt,
448 const struct stmmac_mode_ops dwmac4_ring_mode_ops = { };