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1// SPDX-License-Identifier: GPL-2.02/* Copyright (c) 2019, Vladimir Oltean <olteanv@gmail.com>3 */4#include <linux/spi/spi.h>5#include "sja1105.h"6 7/* The adjfine API clamps ppb between [-32,768,000, 32,768,000], and8 * therefore scaled_ppm between [-2,147,483,648, 2,147,483,647].9 * Set the maximum supported ppb to a round value smaller than the maximum.10 *11 * Percentually speaking, this is a +/- 0.032x adjustment of the12 * free-running counter (0.968x to 1.032x).13 */14#define SJA1105_MAX_ADJ_PPB		3200000015#define SJA1105_SIZE_PTP_CMD		416 17/* PTPSYNCTS has no interrupt or update mechanism, because the intended18 * hardware use case is for the timestamp to be collected synchronously,19 * immediately after the CAS_MASTER SJA1105 switch has performed a CASSYNC20 * one-shot toggle (no return to level) on the PTP_CLK pin. When used as a21 * generic extts source, the PTPSYNCTS register needs polling and a comparison22 * with the old value. The polling interval is configured as the Nyquist rate23 * of a signal with 50% duty cycle and 1Hz frequency, which is sadly all that24 * this hardware can do (but may be enough for some setups). Anything of higher25 * frequency than 1 Hz will be lost, since there is no timestamp FIFO.26 */27#define SJA1105_EXTTS_INTERVAL		(HZ / 6)28 29/*            This range is actually +/- SJA1105_MAX_ADJ_PPB30 *            divided by 1000 (ppb -> ppm) and with a 16-bit31 *            "fractional" part (actually fixed point).32 *                                    |33 *                                    v34 * Convert scaled_ppm from the +/- ((10^6) << 16) range35 * into the +/- (1 << 31) range.36 *37 * This forgoes a "ppb" numeric representation (up to NSEC_PER_SEC)38 * and defines the scaling factor between scaled_ppm and the actual39 * frequency adjustments of the PHC.40 *41 *   ptpclkrate = scaled_ppm * 2^31 / (10^6 * 2^16)42 *   simplifies to43 *   ptpclkrate = scaled_ppm * 2^9 / 5^644 */45#define SJA1105_CC_MULT_NUM		(1 << 9)46#define SJA1105_CC_MULT_DEM		1562547#define SJA1105_CC_MULT			0x8000000048 49enum sja1105_ptp_clk_mode {50	PTP_ADD_MODE = 1,51	PTP_SET_MODE = 0,52};53 54#define extts_to_data(t) \55		container_of((t), struct sja1105_ptp_data, extts_timer)56#define ptp_caps_to_data(d) \57		container_of((d), struct sja1105_ptp_data, caps)58#define ptp_data_to_sja1105(d) \59		container_of((d), struct sja1105_private, ptp_data)60 61int sja1105_hwtstamp_set(struct dsa_switch *ds, int port, struct ifreq *ifr)62{63	struct sja1105_private *priv = ds->priv;64	struct hwtstamp_config config;65 66	if (copy_from_user(&config, ifr->ifr_data, sizeof(config)))67		return -EFAULT;68 69	switch (config.tx_type) {70	case HWTSTAMP_TX_OFF:71		priv->hwts_tx_en &= ~BIT(port);72		break;73	case HWTSTAMP_TX_ON:74		priv->hwts_tx_en |= BIT(port);75		break;76	default:77		return -ERANGE;78	}79 80	switch (config.rx_filter) {81	case HWTSTAMP_FILTER_NONE:82		priv->hwts_rx_en &= ~BIT(port);83		break;84	default:85		priv->hwts_rx_en |= BIT(port);86		break;87	}88 89	if (copy_to_user(ifr->ifr_data, &config, sizeof(config)))90		return -EFAULT;91	return 0;92}93 94int sja1105_hwtstamp_get(struct dsa_switch *ds, int port, struct ifreq *ifr)95{96	struct sja1105_private *priv = ds->priv;97	struct hwtstamp_config config;98 99	config.flags = 0;100	if (priv->hwts_tx_en & BIT(port))101		config.tx_type = HWTSTAMP_TX_ON;102	else103		config.tx_type = HWTSTAMP_TX_OFF;104	if (priv->hwts_rx_en & BIT(port))105		config.rx_filter = HWTSTAMP_FILTER_PTP_V2_L2_EVENT;106	else107		config.rx_filter = HWTSTAMP_FILTER_NONE;108 109	return copy_to_user(ifr->ifr_data, &config, sizeof(config)) ?110		-EFAULT : 0;111}112 113int sja1105_get_ts_info(struct dsa_switch *ds, int port,114			struct kernel_ethtool_ts_info *info)115{116	struct sja1105_private *priv = ds->priv;117	struct sja1105_ptp_data *ptp_data = &priv->ptp_data;118 119	/* Called during cleanup */120	if (!ptp_data->clock)121		return -ENODEV;122 123	info->so_timestamping = SOF_TIMESTAMPING_TX_HARDWARE |124				SOF_TIMESTAMPING_RX_HARDWARE |125				SOF_TIMESTAMPING_RAW_HARDWARE;126	info->tx_types = (1 << HWTSTAMP_TX_OFF) |127			 (1 << HWTSTAMP_TX_ON);128	info->rx_filters = (1 << HWTSTAMP_FILTER_NONE) |129			   (1 << HWTSTAMP_FILTER_PTP_V2_L2_EVENT);130	info->phc_index = ptp_clock_index(ptp_data->clock);131	return 0;132}133 134void sja1105et_ptp_cmd_packing(u8 *buf, struct sja1105_ptp_cmd *cmd,135			       enum packing_op op)136{137	const int size = SJA1105_SIZE_PTP_CMD;138	/* No need to keep this as part of the structure */139	u64 valid = 1;140 141	sja1105_packing(buf, &valid,           31, 31, size, op);142	sja1105_packing(buf, &cmd->ptpstrtsch, 30, 30, size, op);143	sja1105_packing(buf, &cmd->ptpstopsch, 29, 29, size, op);144	sja1105_packing(buf, &cmd->startptpcp, 28, 28, size, op);145	sja1105_packing(buf, &cmd->stopptpcp,  27, 27, size, op);146	sja1105_packing(buf, &cmd->resptp,      2,  2, size, op);147	sja1105_packing(buf, &cmd->corrclk4ts,  1,  1, size, op);148	sja1105_packing(buf, &cmd->ptpclkadd,   0,  0, size, op);149}150 151void sja1105pqrs_ptp_cmd_packing(u8 *buf, struct sja1105_ptp_cmd *cmd,152				 enum packing_op op)153{154	const int size = SJA1105_SIZE_PTP_CMD;155	/* No need to keep this as part of the structure */156	u64 valid = 1;157 158	sja1105_packing(buf, &valid,           31, 31, size, op);159	sja1105_packing(buf, &cmd->ptpstrtsch, 30, 30, size, op);160	sja1105_packing(buf, &cmd->ptpstopsch, 29, 29, size, op);161	sja1105_packing(buf, &cmd->startptpcp, 28, 28, size, op);162	sja1105_packing(buf, &cmd->stopptpcp,  27, 27, size, op);163	sja1105_packing(buf, &cmd->resptp,      3,  3, size, op);164	sja1105_packing(buf, &cmd->corrclk4ts,  2,  2, size, op);165	sja1105_packing(buf, &cmd->ptpclkadd,   0,  0, size, op);166}167 168int sja1105_ptp_commit(struct dsa_switch *ds, struct sja1105_ptp_cmd *cmd,169		       sja1105_spi_rw_mode_t rw)170{171	const struct sja1105_private *priv = ds->priv;172	const struct sja1105_regs *regs = priv->info->regs;173	u8 buf[SJA1105_SIZE_PTP_CMD] = {0};174	int rc;175 176	if (rw == SPI_WRITE)177		priv->info->ptp_cmd_packing(buf, cmd, PACK);178 179	rc = sja1105_xfer_buf(priv, rw, regs->ptp_control, buf,180			      SJA1105_SIZE_PTP_CMD);181 182	if (rw == SPI_READ)183		priv->info->ptp_cmd_packing(buf, cmd, UNPACK);184 185	return rc;186}187 188/* The switch returns partial timestamps (24 bits for SJA1105 E/T, which wrap189 * around in 0.135 seconds, and 32 bits for P/Q/R/S, wrapping around in 34.35190 * seconds).191 *192 * This receives the RX or TX MAC timestamps, provided by hardware as193 * the lower bits of the cycle counter, sampled at the time the timestamp was194 * collected.195 *196 * To reconstruct into a full 64-bit-wide timestamp, the cycle counter is197 * read and the high-order bits are filled in.198 *199 * Must be called within one wraparound period of the partial timestamp since200 * it was generated by the MAC.201 */202static u64 sja1105_tstamp_reconstruct(struct dsa_switch *ds, u64 now,203				      u64 ts_partial)204{205	struct sja1105_private *priv = ds->priv;206	u64 partial_tstamp_mask = CYCLECOUNTER_MASK(priv->info->ptp_ts_bits);207	u64 ts_reconstructed;208 209	ts_reconstructed = (now & ~partial_tstamp_mask) | ts_partial;210 211	/* Check lower bits of current cycle counter against the timestamp.212	 * If the current cycle counter is lower than the partial timestamp,213	 * then wraparound surely occurred and must be accounted for.214	 */215	if ((now & partial_tstamp_mask) <= ts_partial)216		ts_reconstructed -= (partial_tstamp_mask + 1);217 218	return ts_reconstructed;219}220 221/* Reads the SPI interface for an egress timestamp generated by the switch222 * for frames sent using management routes.223 *224 * SJA1105 E/T layout of the 4-byte SPI payload:225 *226 * 31    23    15    7     0227 * |     |     |     |     |228 * +-----+-----+-----+     ^229 *          ^              |230 *          |              |231 *  24-bit timestamp   Update bit232 *233 *234 * SJA1105 P/Q/R/S layout of the 8-byte SPI payload:235 *236 * 31    23    15    7     0     63    55    47    39    32237 * |     |     |     |     |     |     |     |     |     |238 *                         ^     +-----+-----+-----+-----+239 *                         |                 ^240 *                         |                 |241 *                    Update bit    32-bit timestamp242 *243 * Notice that the update bit is in the same place.244 * To have common code for E/T and P/Q/R/S for reading the timestamp,245 * we need to juggle with the offset and the bit indices.246 */247static int sja1105_ptpegr_ts_poll(struct dsa_switch *ds, int port, u64 *ts)248{249	struct sja1105_private *priv = ds->priv;250	const struct sja1105_regs *regs = priv->info->regs;251	int tstamp_bit_start, tstamp_bit_end;252	int timeout = 10;253	u8 packed_buf[8];254	u64 update;255	int rc;256 257	do {258		rc = sja1105_xfer_buf(priv, SPI_READ, regs->ptpegr_ts[port],259				      packed_buf, priv->info->ptpegr_ts_bytes);260		if (rc < 0)261			return rc;262 263		sja1105_unpack(packed_buf, &update, 0, 0,264			       priv->info->ptpegr_ts_bytes);265		if (update)266			break;267 268		usleep_range(10, 50);269	} while (--timeout);270 271	if (!timeout)272		return -ETIMEDOUT;273 274	/* Point the end bit to the second 32-bit word on P/Q/R/S,275	 * no-op on E/T.276	 */277	tstamp_bit_end = (priv->info->ptpegr_ts_bytes - 4) * 8;278	/* Shift the 24-bit timestamp on E/T to be collected from 31:8.279	 * No-op on P/Q/R/S.280	 */281	tstamp_bit_end += 32 - priv->info->ptp_ts_bits;282	tstamp_bit_start = tstamp_bit_end + priv->info->ptp_ts_bits - 1;283 284	*ts = 0;285 286	sja1105_unpack(packed_buf, ts, tstamp_bit_start, tstamp_bit_end,287		       priv->info->ptpegr_ts_bytes);288 289	return 0;290}291 292/* Caller must hold ptp_data->lock */293static int sja1105_ptpclkval_read(struct sja1105_private *priv, u64 *ticks,294				  struct ptp_system_timestamp *ptp_sts)295{296	const struct sja1105_regs *regs = priv->info->regs;297 298	return sja1105_xfer_u64(priv, SPI_READ, regs->ptpclkval, ticks,299				ptp_sts);300}301 302/* Caller must hold ptp_data->lock */303static int sja1105_ptpclkval_write(struct sja1105_private *priv, u64 ticks,304				   struct ptp_system_timestamp *ptp_sts)305{306	const struct sja1105_regs *regs = priv->info->regs;307 308	return sja1105_xfer_u64(priv, SPI_WRITE, regs->ptpclkval, &ticks,309				ptp_sts);310}311 312static void sja1105_extts_poll(struct sja1105_private *priv)313{314	struct sja1105_ptp_data *ptp_data = &priv->ptp_data;315	const struct sja1105_regs *regs = priv->info->regs;316	struct ptp_clock_event event;317	u64 ptpsyncts = 0;318	int rc;319 320	rc = sja1105_xfer_u64(priv, SPI_READ, regs->ptpsyncts, &ptpsyncts,321			      NULL);322	if (rc < 0)323		dev_err_ratelimited(priv->ds->dev,324				    "Failed to read PTPSYNCTS: %d\n", rc);325 326	if (ptpsyncts && ptp_data->ptpsyncts != ptpsyncts) {327		event.index = 0;328		event.type = PTP_CLOCK_EXTTS;329		event.timestamp = ns_to_ktime(sja1105_ticks_to_ns(ptpsyncts));330		ptp_clock_event(ptp_data->clock, &event);331 332		ptp_data->ptpsyncts = ptpsyncts;333	}334}335 336static long sja1105_rxtstamp_work(struct ptp_clock_info *ptp)337{338	struct sja1105_ptp_data *ptp_data = ptp_caps_to_data(ptp);339	struct sja1105_private *priv = ptp_data_to_sja1105(ptp_data);340	struct dsa_switch *ds = priv->ds;341	struct sk_buff *skb;342 343	mutex_lock(&ptp_data->lock);344 345	while ((skb = skb_dequeue(&ptp_data->skb_rxtstamp_queue)) != NULL) {346		struct skb_shared_hwtstamps *shwt = skb_hwtstamps(skb);347		u64 ticks, ts;348		int rc;349 350		rc = sja1105_ptpclkval_read(priv, &ticks, NULL);351		if (rc < 0) {352			dev_err(ds->dev, "Failed to read PTP clock: %d\n", rc);353			kfree_skb(skb);354			continue;355		}356 357		*shwt = (struct skb_shared_hwtstamps) {0};358 359		ts = SJA1105_SKB_CB(skb)->tstamp;360		ts = sja1105_tstamp_reconstruct(ds, ticks, ts);361 362		shwt->hwtstamp = ns_to_ktime(sja1105_ticks_to_ns(ts));363		netif_rx(skb);364	}365 366	if (ptp_data->extts_enabled)367		sja1105_extts_poll(priv);368 369	mutex_unlock(&ptp_data->lock);370 371	/* Don't restart */372	return -1;373}374 375bool sja1105_rxtstamp(struct dsa_switch *ds, int port, struct sk_buff *skb)376{377	struct sja1105_private *priv = ds->priv;378	struct sja1105_ptp_data *ptp_data = &priv->ptp_data;379 380	if (!(priv->hwts_rx_en & BIT(port)))381		return false;382 383	/* We need to read the full PTP clock to reconstruct the Rx384	 * timestamp. For that we need a sleepable context.385	 */386	skb_queue_tail(&ptp_data->skb_rxtstamp_queue, skb);387	ptp_schedule_worker(ptp_data->clock, 0);388	return true;389}390 391bool sja1110_rxtstamp(struct dsa_switch *ds, int port, struct sk_buff *skb)392{393	struct skb_shared_hwtstamps *shwt = skb_hwtstamps(skb);394	u64 ts = SJA1105_SKB_CB(skb)->tstamp;395 396	*shwt = (struct skb_shared_hwtstamps) {0};397 398	shwt->hwtstamp = ns_to_ktime(sja1105_ticks_to_ns(ts));399 400	/* Don't defer */401	return false;402}403 404/* Called from dsa_skb_defer_rx_timestamp */405bool sja1105_port_rxtstamp(struct dsa_switch *ds, int port,406			   struct sk_buff *skb, unsigned int type)407{408	struct sja1105_private *priv = ds->priv;409 410	return priv->info->rxtstamp(ds, port, skb);411}412 413void sja1110_process_meta_tstamp(struct dsa_switch *ds, int port, u8 ts_id,414				 enum sja1110_meta_tstamp dir, u64 tstamp)415{416	struct sja1105_private *priv = ds->priv;417	struct sja1105_ptp_data *ptp_data = &priv->ptp_data;418	struct sk_buff *skb, *skb_tmp, *skb_match = NULL;419	struct skb_shared_hwtstamps shwt = {0};420 421	/* We don't care about RX timestamps on the CPU port */422	if (dir == SJA1110_META_TSTAMP_RX)423		return;424 425	spin_lock(&ptp_data->skb_txtstamp_queue.lock);426 427	skb_queue_walk_safe(&ptp_data->skb_txtstamp_queue, skb, skb_tmp) {428		if (SJA1105_SKB_CB(skb)->ts_id != ts_id)429			continue;430 431		__skb_unlink(skb, &ptp_data->skb_txtstamp_queue);432		skb_match = skb;433 434		break;435	}436 437	spin_unlock(&ptp_data->skb_txtstamp_queue.lock);438 439	if (WARN_ON(!skb_match))440		return;441 442	shwt.hwtstamp = ns_to_ktime(sja1105_ticks_to_ns(tstamp));443	skb_complete_tx_timestamp(skb_match, &shwt);444}445 446/* In addition to cloning the skb which is done by the common447 * sja1105_port_txtstamp, we need to generate a timestamp ID and save the448 * packet to the TX timestamping queue.449 */450void sja1110_txtstamp(struct dsa_switch *ds, int port, struct sk_buff *skb)451{452	struct sk_buff *clone = SJA1105_SKB_CB(skb)->clone;453	struct sja1105_private *priv = ds->priv;454	struct sja1105_ptp_data *ptp_data = &priv->ptp_data;455	u8 ts_id;456 457	skb_shinfo(skb)->tx_flags |= SKBTX_IN_PROGRESS;458 459	spin_lock(&priv->ts_id_lock);460 461	ts_id = priv->ts_id;462	/* Deal automatically with 8-bit wraparound */463	priv->ts_id++;464 465	SJA1105_SKB_CB(clone)->ts_id = ts_id;466 467	spin_unlock(&priv->ts_id_lock);468 469	skb_queue_tail(&ptp_data->skb_txtstamp_queue, clone);470}471 472/* Called from dsa_skb_tx_timestamp. This callback is just to clone473 * the skb and have it available in SJA1105_SKB_CB in the .port_deferred_xmit474 * callback, where we will timestamp it synchronously.475 */476void sja1105_port_txtstamp(struct dsa_switch *ds, int port, struct sk_buff *skb)477{478	struct sja1105_private *priv = ds->priv;479	struct sk_buff *clone;480 481	if (!(priv->hwts_tx_en & BIT(port)))482		return;483 484	clone = skb_clone_sk(skb);485	if (!clone)486		return;487 488	SJA1105_SKB_CB(skb)->clone = clone;489 490	if (priv->info->txtstamp)491		priv->info->txtstamp(ds, port, skb);492}493 494static int sja1105_ptp_reset(struct dsa_switch *ds)495{496	struct sja1105_private *priv = ds->priv;497	struct sja1105_ptp_data *ptp_data = &priv->ptp_data;498	struct sja1105_ptp_cmd cmd = ptp_data->cmd;499	int rc;500 501	mutex_lock(&ptp_data->lock);502 503	cmd.resptp = 1;504 505	dev_dbg(ds->dev, "Resetting PTP clock\n");506	rc = sja1105_ptp_commit(ds, &cmd, SPI_WRITE);507 508	sja1105_tas_clockstep(priv->ds);509 510	mutex_unlock(&ptp_data->lock);511 512	return rc;513}514 515/* Caller must hold ptp_data->lock */516int __sja1105_ptp_gettimex(struct dsa_switch *ds, u64 *ns,517			   struct ptp_system_timestamp *ptp_sts)518{519	struct sja1105_private *priv = ds->priv;520	u64 ticks;521	int rc;522 523	rc = sja1105_ptpclkval_read(priv, &ticks, ptp_sts);524	if (rc < 0) {525		dev_err(ds->dev, "Failed to read PTP clock: %d\n", rc);526		return rc;527	}528 529	*ns = sja1105_ticks_to_ns(ticks);530 531	return 0;532}533 534static int sja1105_ptp_gettimex(struct ptp_clock_info *ptp,535				struct timespec64 *ts,536				struct ptp_system_timestamp *ptp_sts)537{538	struct sja1105_ptp_data *ptp_data = ptp_caps_to_data(ptp);539	struct sja1105_private *priv = ptp_data_to_sja1105(ptp_data);540	u64 now = 0;541	int rc;542 543	mutex_lock(&ptp_data->lock);544 545	rc = __sja1105_ptp_gettimex(priv->ds, &now, ptp_sts);546	*ts = ns_to_timespec64(now);547 548	mutex_unlock(&ptp_data->lock);549 550	return rc;551}552 553/* Caller must hold ptp_data->lock */554static int sja1105_ptp_mode_set(struct sja1105_private *priv,555				enum sja1105_ptp_clk_mode mode)556{557	struct sja1105_ptp_data *ptp_data = &priv->ptp_data;558 559	if (ptp_data->cmd.ptpclkadd == mode)560		return 0;561 562	ptp_data->cmd.ptpclkadd = mode;563 564	return sja1105_ptp_commit(priv->ds, &ptp_data->cmd, SPI_WRITE);565}566 567/* Write to PTPCLKVAL while PTPCLKADD is 0 */568int __sja1105_ptp_settime(struct dsa_switch *ds, u64 ns,569			  struct ptp_system_timestamp *ptp_sts)570{571	struct sja1105_private *priv = ds->priv;572	u64 ticks = ns_to_sja1105_ticks(ns);573	int rc;574 575	rc = sja1105_ptp_mode_set(priv, PTP_SET_MODE);576	if (rc < 0) {577		dev_err(priv->ds->dev, "Failed to put PTPCLK in set mode\n");578		return rc;579	}580 581	rc = sja1105_ptpclkval_write(priv, ticks, ptp_sts);582 583	sja1105_tas_clockstep(priv->ds);584 585	return rc;586}587 588static int sja1105_ptp_settime(struct ptp_clock_info *ptp,589			       const struct timespec64 *ts)590{591	struct sja1105_ptp_data *ptp_data = ptp_caps_to_data(ptp);592	struct sja1105_private *priv = ptp_data_to_sja1105(ptp_data);593	u64 ns = timespec64_to_ns(ts);594	int rc;595 596	mutex_lock(&ptp_data->lock);597 598	rc = __sja1105_ptp_settime(priv->ds, ns, NULL);599 600	mutex_unlock(&ptp_data->lock);601 602	return rc;603}604 605static int sja1105_ptp_adjfine(struct ptp_clock_info *ptp, long scaled_ppm)606{607	struct sja1105_ptp_data *ptp_data = ptp_caps_to_data(ptp);608	struct sja1105_private *priv = ptp_data_to_sja1105(ptp_data);609	const struct sja1105_regs *regs = priv->info->regs;610	u32 clkrate32;611	s64 clkrate;612	int rc;613 614	clkrate = (s64)scaled_ppm * SJA1105_CC_MULT_NUM;615	clkrate = div_s64(clkrate, SJA1105_CC_MULT_DEM);616 617	/* Take a +/- value and re-center it around 2^31. */618	clkrate = SJA1105_CC_MULT + clkrate;619	WARN_ON(abs(clkrate) >= GENMASK_ULL(31, 0));620	clkrate32 = clkrate;621 622	mutex_lock(&ptp_data->lock);623 624	rc = sja1105_xfer_u32(priv, SPI_WRITE, regs->ptpclkrate, &clkrate32,625			      NULL);626 627	sja1105_tas_adjfreq(priv->ds);628 629	mutex_unlock(&ptp_data->lock);630 631	return rc;632}633 634/* Write to PTPCLKVAL while PTPCLKADD is 1 */635int __sja1105_ptp_adjtime(struct dsa_switch *ds, s64 delta)636{637	struct sja1105_private *priv = ds->priv;638	s64 ticks = ns_to_sja1105_ticks(delta);639	int rc;640 641	rc = sja1105_ptp_mode_set(priv, PTP_ADD_MODE);642	if (rc < 0) {643		dev_err(priv->ds->dev, "Failed to put PTPCLK in add mode\n");644		return rc;645	}646 647	rc = sja1105_ptpclkval_write(priv, ticks, NULL);648 649	sja1105_tas_clockstep(priv->ds);650 651	return rc;652}653 654static int sja1105_ptp_adjtime(struct ptp_clock_info *ptp, s64 delta)655{656	struct sja1105_ptp_data *ptp_data = ptp_caps_to_data(ptp);657	struct sja1105_private *priv = ptp_data_to_sja1105(ptp_data);658	int rc;659 660	mutex_lock(&ptp_data->lock);661 662	rc = __sja1105_ptp_adjtime(priv->ds, delta);663 664	mutex_unlock(&ptp_data->lock);665 666	return rc;667}668 669static void sja1105_ptp_extts_setup_timer(struct sja1105_ptp_data *ptp_data)670{671	unsigned long expires = ((jiffies / SJA1105_EXTTS_INTERVAL) + 1) *672				SJA1105_EXTTS_INTERVAL;673 674	mod_timer(&ptp_data->extts_timer, expires);675}676 677static void sja1105_ptp_extts_timer(struct timer_list *t)678{679	struct sja1105_ptp_data *ptp_data = extts_to_data(t);680 681	ptp_schedule_worker(ptp_data->clock, 0);682 683	sja1105_ptp_extts_setup_timer(ptp_data);684}685 686static int sja1105_change_ptp_clk_pin_func(struct sja1105_private *priv,687					   enum ptp_pin_function func)688{689	struct sja1105_avb_params_entry *avb;690	enum ptp_pin_function old_func;691 692	avb = priv->static_config.tables[BLK_IDX_AVB_PARAMS].entries;693 694	if (priv->info->device_id == SJA1105E_DEVICE_ID ||695	    priv->info->device_id == SJA1105T_DEVICE_ID ||696	    avb->cas_master)697		old_func = PTP_PF_PEROUT;698	else699		old_func = PTP_PF_EXTTS;700 701	if (func == old_func)702		return 0;703 704	avb->cas_master = (func == PTP_PF_PEROUT);705 706	return sja1105_dynamic_config_write(priv, BLK_IDX_AVB_PARAMS, 0, avb,707					    true);708}709 710/* The PTP_CLK pin may be configured to toggle with a 50% duty cycle and a711 * frequency f:712 *713 *           NSEC_PER_SEC714 * f = ----------------------715 *     (PTPPINDUR * 8 ns) * 2716 */717static int sja1105_per_out_enable(struct sja1105_private *priv,718				  struct ptp_perout_request *perout,719				  bool on)720{721	struct sja1105_ptp_data *ptp_data = &priv->ptp_data;722	const struct sja1105_regs *regs = priv->info->regs;723	struct sja1105_ptp_cmd cmd = ptp_data->cmd;724	int rc;725 726	/* We only support one channel */727	if (perout->index != 0)728		return -EOPNOTSUPP;729 730	/* Reject requests with unsupported flags */731	if (perout->flags)732		return -EOPNOTSUPP;733 734	mutex_lock(&ptp_data->lock);735 736	rc = sja1105_change_ptp_clk_pin_func(priv, PTP_PF_PEROUT);737	if (rc)738		goto out;739 740	if (on) {741		struct timespec64 pin_duration_ts = {742			.tv_sec = perout->period.sec,743			.tv_nsec = perout->period.nsec,744		};745		struct timespec64 pin_start_ts = {746			.tv_sec = perout->start.sec,747			.tv_nsec = perout->start.nsec,748		};749		u64 pin_duration = timespec64_to_ns(&pin_duration_ts);750		u64 pin_start = timespec64_to_ns(&pin_start_ts);751		u32 pin_duration32;752		u64 now;753 754		/* ptppindur: 32 bit register which holds the interval between755		 * 2 edges on PTP_CLK. So check for truncation which happens756		 * at periods larger than around 68.7 seconds.757		 */758		pin_duration = ns_to_sja1105_ticks(pin_duration / 2);759		if (pin_duration > U32_MAX) {760			rc = -ERANGE;761			goto out;762		}763		pin_duration32 = pin_duration;764 765		/* ptppins: 64 bit register which needs to hold a PTP time766		 * larger than the current time, otherwise the startptpcp767		 * command won't do anything. So advance the current time768		 * by a number of periods in a way that won't alter the769		 * phase offset.770		 */771		rc = __sja1105_ptp_gettimex(priv->ds, &now, NULL);772		if (rc < 0)773			goto out;774 775		pin_start = future_base_time(pin_start, pin_duration,776					     now + 1ull * NSEC_PER_SEC);777		pin_start = ns_to_sja1105_ticks(pin_start);778 779		rc = sja1105_xfer_u64(priv, SPI_WRITE, regs->ptppinst,780				      &pin_start, NULL);781		if (rc < 0)782			goto out;783 784		rc = sja1105_xfer_u32(priv, SPI_WRITE, regs->ptppindur,785				      &pin_duration32, NULL);786		if (rc < 0)787			goto out;788	}789 790	if (on)791		cmd.startptpcp = true;792	else793		cmd.stopptpcp = true;794 795	rc = sja1105_ptp_commit(priv->ds, &cmd, SPI_WRITE);796 797out:798	mutex_unlock(&ptp_data->lock);799 800	return rc;801}802 803static int sja1105_extts_enable(struct sja1105_private *priv,804				struct ptp_extts_request *extts,805				bool on)806{807	int rc;808 809	/* We only support one channel */810	if (extts->index != 0)811		return -EOPNOTSUPP;812 813	/* Reject requests with unsupported flags */814	if (extts->flags & ~(PTP_ENABLE_FEATURE |815			     PTP_RISING_EDGE |816			     PTP_FALLING_EDGE |817			     PTP_STRICT_FLAGS))818		return -EOPNOTSUPP;819 820	/* We can only enable time stamping on both edges, sadly. */821	if ((extts->flags & PTP_STRICT_FLAGS) &&822	    (extts->flags & PTP_ENABLE_FEATURE) &&823	    (extts->flags & PTP_EXTTS_EDGES) != PTP_EXTTS_EDGES)824		return -EOPNOTSUPP;825 826	rc = sja1105_change_ptp_clk_pin_func(priv, PTP_PF_EXTTS);827	if (rc)828		return rc;829 830	priv->ptp_data.extts_enabled = on;831 832	if (on)833		sja1105_ptp_extts_setup_timer(&priv->ptp_data);834	else835		del_timer_sync(&priv->ptp_data.extts_timer);836 837	return 0;838}839 840static int sja1105_ptp_enable(struct ptp_clock_info *ptp,841			      struct ptp_clock_request *req, int on)842{843	struct sja1105_ptp_data *ptp_data = ptp_caps_to_data(ptp);844	struct sja1105_private *priv = ptp_data_to_sja1105(ptp_data);845	int rc = -EOPNOTSUPP;846 847	if (req->type == PTP_CLK_REQ_PEROUT)848		rc = sja1105_per_out_enable(priv, &req->perout, on);849	else if (req->type == PTP_CLK_REQ_EXTTS)850		rc = sja1105_extts_enable(priv, &req->extts, on);851 852	return rc;853}854 855static int sja1105_ptp_verify_pin(struct ptp_clock_info *ptp, unsigned int pin,856				  enum ptp_pin_function func, unsigned int chan)857{858	struct sja1105_ptp_data *ptp_data = ptp_caps_to_data(ptp);859	struct sja1105_private *priv = ptp_data_to_sja1105(ptp_data);860 861	if (chan != 0 || pin != 0)862		return -1;863 864	switch (func) {865	case PTP_PF_NONE:866	case PTP_PF_PEROUT:867		break;868	case PTP_PF_EXTTS:869		if (priv->info->device_id == SJA1105E_DEVICE_ID ||870		    priv->info->device_id == SJA1105T_DEVICE_ID)871			return -1;872		break;873	default:874		return -1;875	}876	return 0;877}878 879static struct ptp_pin_desc sja1105_ptp_pin = {880	.name = "ptp_clk",881	.index = 0,882	.func = PTP_PF_NONE,883};884 885int sja1105_ptp_clock_register(struct dsa_switch *ds)886{887	struct sja1105_private *priv = ds->priv;888	struct sja1105_ptp_data *ptp_data = &priv->ptp_data;889 890	ptp_data->caps = (struct ptp_clock_info) {891		.owner		= THIS_MODULE,892		.name		= "SJA1105 PHC",893		.adjfine	= sja1105_ptp_adjfine,894		.adjtime	= sja1105_ptp_adjtime,895		.gettimex64	= sja1105_ptp_gettimex,896		.settime64	= sja1105_ptp_settime,897		.enable		= sja1105_ptp_enable,898		.verify		= sja1105_ptp_verify_pin,899		.do_aux_work	= sja1105_rxtstamp_work,900		.max_adj	= SJA1105_MAX_ADJ_PPB,901		.pin_config	= &sja1105_ptp_pin,902		.n_pins		= 1,903		.n_ext_ts	= 1,904		.n_per_out	= 1,905	};906 907	/* Only used on SJA1105 */908	skb_queue_head_init(&ptp_data->skb_rxtstamp_queue);909	/* Only used on SJA1110 */910	skb_queue_head_init(&ptp_data->skb_txtstamp_queue);911 912	ptp_data->clock = ptp_clock_register(&ptp_data->caps, ds->dev);913	if (IS_ERR_OR_NULL(ptp_data->clock))914		return PTR_ERR(ptp_data->clock);915 916	ptp_data->cmd.corrclk4ts = true;917	ptp_data->cmd.ptpclkadd = PTP_SET_MODE;918 919	timer_setup(&ptp_data->extts_timer, sja1105_ptp_extts_timer, 0);920 921	return sja1105_ptp_reset(ds);922}923 924void sja1105_ptp_clock_unregister(struct dsa_switch *ds)925{926	struct sja1105_private *priv = ds->priv;927	struct sja1105_ptp_data *ptp_data = &priv->ptp_data;928 929	if (IS_ERR_OR_NULL(ptp_data->clock))930		return;931 932	del_timer_sync(&ptp_data->extts_timer);933	ptp_cancel_worker_sync(ptp_data->clock);934	skb_queue_purge(&ptp_data->skb_txtstamp_queue);935	skb_queue_purge(&ptp_data->skb_rxtstamp_queue);936	ptp_clock_unregister(ptp_data->clock);937	ptp_data->clock = NULL;938}939 940void sja1105_ptp_txtstamp_skb(struct dsa_switch *ds, int port,941			      struct sk_buff *skb)942{943	struct sja1105_private *priv = ds->priv;944	struct sja1105_ptp_data *ptp_data = &priv->ptp_data;945	struct skb_shared_hwtstamps shwt = {0};946	u64 ticks, ts;947	int rc;948 949	skb_shinfo(skb)->tx_flags |= SKBTX_IN_PROGRESS;950 951	mutex_lock(&ptp_data->lock);952 953	rc = sja1105_ptpegr_ts_poll(ds, port, &ts);954	if (rc < 0) {955		dev_err(ds->dev, "timed out polling for tstamp\n");956		kfree_skb(skb);957		goto out;958	}959 960	rc = sja1105_ptpclkval_read(priv, &ticks, NULL);961	if (rc < 0) {962		dev_err(ds->dev, "Failed to read PTP clock: %d\n", rc);963		kfree_skb(skb);964		goto out;965	}966 967	ts = sja1105_tstamp_reconstruct(ds, ticks, ts);968 969	shwt.hwtstamp = ns_to_ktime(sja1105_ticks_to_ns(ts));970	skb_complete_tx_timestamp(skb, &shwt);971 972out:973	mutex_unlock(&ptp_data->lock);974}975