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1// SPDX-License-Identifier: GPL-2.0+2/*3 * TI Common Platform Time Sync4 *5 * Copyright (C) 2012 Richard Cochran <richardcochran@gmail.com>6 *7 */8#include <linux/clk-provider.h>9#include <linux/err.h>10#include <linux/if.h>11#include <linux/hrtimer.h>12#include <linux/module.h>13#include <linux/net_tstamp.h>14#include <linux/ptp_classify.h>15#include <linux/time.h>16#include <linux/uaccess.h>17#include <linux/workqueue.h>18#include <linux/if_ether.h>19#include <linux/if_vlan.h>20 21#include "cpts.h"22 23#define CPTS_SKB_TX_WORK_TIMEOUT 1 /* jiffies */24#define CPTS_SKB_RX_TX_TMO 100 /*ms */25#define CPTS_EVENT_RX_TX_TIMEOUT (100) /* ms */26 27struct cpts_skb_cb_data {28 u32 skb_mtype_seqid;29 unsigned long tmo;30};31 32#define cpts_read32(c, r) readl_relaxed(&c->reg->r)33#define cpts_write32(c, v, r) writel_relaxed(v, &c->reg->r)34 35static int cpts_event_port(struct cpts_event *event)36{37 return (event->high >> PORT_NUMBER_SHIFT) & PORT_NUMBER_MASK;38}39 40static int event_expired(struct cpts_event *event)41{42 return time_after(jiffies, event->tmo);43}44 45static int event_type(struct cpts_event *event)46{47 return (event->high >> EVENT_TYPE_SHIFT) & EVENT_TYPE_MASK;48}49 50static int cpts_fifo_pop(struct cpts *cpts, u32 *high, u32 *low)51{52 u32 r = cpts_read32(cpts, intstat_raw);53 54 if (r & TS_PEND_RAW) {55 *high = cpts_read32(cpts, event_high);56 *low = cpts_read32(cpts, event_low);57 cpts_write32(cpts, EVENT_POP, event_pop);58 return 0;59 }60 return -1;61}62 63static int cpts_purge_events(struct cpts *cpts)64{65 struct list_head *this, *next;66 struct cpts_event *event;67 int removed = 0;68 69 list_for_each_safe(this, next, &cpts->events) {70 event = list_entry(this, struct cpts_event, list);71 if (event_expired(event)) {72 list_del_init(&event->list);73 list_add(&event->list, &cpts->pool);74 ++removed;75 }76 }77 78 if (removed)79 dev_dbg(cpts->dev, "cpts: event pool cleaned up %d\n", removed);80 return removed ? 0 : -1;81}82 83static void cpts_purge_txq(struct cpts *cpts)84{85 struct cpts_skb_cb_data *skb_cb;86 struct sk_buff *skb, *tmp;87 int removed = 0;88 89 skb_queue_walk_safe(&cpts->txq, skb, tmp) {90 skb_cb = (struct cpts_skb_cb_data *)skb->cb;91 if (time_after(jiffies, skb_cb->tmo)) {92 __skb_unlink(skb, &cpts->txq);93 dev_consume_skb_any(skb);94 ++removed;95 }96 }97 98 if (removed)99 dev_dbg(cpts->dev, "txq cleaned up %d\n", removed);100}101 102/*103 * Returns zero if matching event type was found.104 */105static int cpts_fifo_read(struct cpts *cpts, int match)106{107 struct ptp_clock_event pevent;108 bool need_schedule = false;109 struct cpts_event *event;110 unsigned long flags;111 int i, type = -1;112 u32 hi, lo;113 114 spin_lock_irqsave(&cpts->lock, flags);115 116 for (i = 0; i < CPTS_FIFO_DEPTH; i++) {117 if (cpts_fifo_pop(cpts, &hi, &lo))118 break;119 120 if (list_empty(&cpts->pool) && cpts_purge_events(cpts)) {121 dev_warn(cpts->dev, "cpts: event pool empty\n");122 break;123 }124 125 event = list_first_entry(&cpts->pool, struct cpts_event, list);126 event->high = hi;127 event->low = lo;128 event->timestamp = timecounter_cyc2time(&cpts->tc, event->low);129 type = event_type(event);130 131 dev_dbg(cpts->dev, "CPTS_EV: %d high:%08X low:%08x\n",132 type, event->high, event->low);133 switch (type) {134 case CPTS_EV_PUSH:135 WRITE_ONCE(cpts->cur_timestamp, lo);136 timecounter_read(&cpts->tc);137 if (cpts->mult_new) {138 cpts->cc.mult = cpts->mult_new;139 cpts->mult_new = 0;140 }141 if (!cpts->irq_poll)142 complete(&cpts->ts_push_complete);143 break;144 case CPTS_EV_TX:145 case CPTS_EV_RX:146 event->tmo = jiffies +147 msecs_to_jiffies(CPTS_EVENT_RX_TX_TIMEOUT);148 149 list_del_init(&event->list);150 list_add_tail(&event->list, &cpts->events);151 need_schedule = true;152 break;153 case CPTS_EV_ROLL:154 case CPTS_EV_HALF:155 break;156 case CPTS_EV_HW:157 pevent.timestamp = event->timestamp;158 pevent.type = PTP_CLOCK_EXTTS;159 pevent.index = cpts_event_port(event) - 1;160 ptp_clock_event(cpts->clock, &pevent);161 break;162 default:163 dev_err(cpts->dev, "cpts: unknown event type\n");164 break;165 }166 if (type == match)167 break;168 }169 170 spin_unlock_irqrestore(&cpts->lock, flags);171 172 if (!cpts->irq_poll && need_schedule)173 ptp_schedule_worker(cpts->clock, 0);174 175 return type == match ? 0 : -1;176}177 178void cpts_misc_interrupt(struct cpts *cpts)179{180 cpts_fifo_read(cpts, -1);181}182EXPORT_SYMBOL_GPL(cpts_misc_interrupt);183 184static u64 cpts_systim_read(const struct cyclecounter *cc)185{186 struct cpts *cpts = container_of(cc, struct cpts, cc);187 188 return READ_ONCE(cpts->cur_timestamp);189}190 191static void cpts_update_cur_time(struct cpts *cpts, int match,192 struct ptp_system_timestamp *sts)193{194 unsigned long flags;195 196 reinit_completion(&cpts->ts_push_complete);197 198 /* use spin_lock_irqsave() here as it has to run very fast */199 spin_lock_irqsave(&cpts->lock, flags);200 ptp_read_system_prets(sts);201 cpts_write32(cpts, TS_PUSH, ts_push);202 cpts_read32(cpts, ts_push);203 ptp_read_system_postts(sts);204 spin_unlock_irqrestore(&cpts->lock, flags);205 206 if (cpts->irq_poll && cpts_fifo_read(cpts, match) && match != -1)207 dev_err(cpts->dev, "cpts: unable to obtain a time stamp\n");208 209 if (!cpts->irq_poll &&210 !wait_for_completion_timeout(&cpts->ts_push_complete, HZ))211 dev_err(cpts->dev, "cpts: obtain a time stamp timeout\n");212}213 214/* PTP clock operations */215 216static int cpts_ptp_adjfine(struct ptp_clock_info *ptp, long scaled_ppm)217{218 struct cpts *cpts = container_of(ptp, struct cpts, info);219 220 mutex_lock(&cpts->ptp_clk_mutex);221 222 cpts->mult_new = adjust_by_scaled_ppm(cpts->cc_mult, scaled_ppm);223 224 cpts_update_cur_time(cpts, CPTS_EV_PUSH, NULL);225 226 mutex_unlock(&cpts->ptp_clk_mutex);227 return 0;228}229 230static int cpts_ptp_adjtime(struct ptp_clock_info *ptp, s64 delta)231{232 struct cpts *cpts = container_of(ptp, struct cpts, info);233 234 mutex_lock(&cpts->ptp_clk_mutex);235 timecounter_adjtime(&cpts->tc, delta);236 mutex_unlock(&cpts->ptp_clk_mutex);237 238 return 0;239}240 241static int cpts_ptp_gettimeex(struct ptp_clock_info *ptp,242 struct timespec64 *ts,243 struct ptp_system_timestamp *sts)244{245 struct cpts *cpts = container_of(ptp, struct cpts, info);246 u64 ns;247 248 mutex_lock(&cpts->ptp_clk_mutex);249 250 cpts_update_cur_time(cpts, CPTS_EV_PUSH, sts);251 252 ns = timecounter_read(&cpts->tc);253 mutex_unlock(&cpts->ptp_clk_mutex);254 255 *ts = ns_to_timespec64(ns);256 257 return 0;258}259 260static int cpts_ptp_settime(struct ptp_clock_info *ptp,261 const struct timespec64 *ts)262{263 struct cpts *cpts = container_of(ptp, struct cpts, info);264 u64 ns;265 266 ns = timespec64_to_ns(ts);267 268 mutex_lock(&cpts->ptp_clk_mutex);269 timecounter_init(&cpts->tc, &cpts->cc, ns);270 mutex_unlock(&cpts->ptp_clk_mutex);271 272 return 0;273}274 275static int cpts_extts_enable(struct cpts *cpts, u32 index, int on)276{277 u32 v;278 279 if (((cpts->hw_ts_enable & BIT(index)) >> index) == on)280 return 0;281 282 mutex_lock(&cpts->ptp_clk_mutex);283 284 v = cpts_read32(cpts, control);285 if (on) {286 v |= BIT(8 + index);287 cpts->hw_ts_enable |= BIT(index);288 } else {289 v &= ~BIT(8 + index);290 cpts->hw_ts_enable &= ~BIT(index);291 }292 cpts_write32(cpts, v, control);293 294 mutex_unlock(&cpts->ptp_clk_mutex);295 296 return 0;297}298 299static int cpts_ptp_enable(struct ptp_clock_info *ptp,300 struct ptp_clock_request *rq, int on)301{302 struct cpts *cpts = container_of(ptp, struct cpts, info);303 304 switch (rq->type) {305 case PTP_CLK_REQ_EXTTS:306 return cpts_extts_enable(cpts, rq->extts.index, on);307 default:308 break;309 }310 311 return -EOPNOTSUPP;312}313 314static bool cpts_match_tx_ts(struct cpts *cpts, struct cpts_event *event)315{316 struct sk_buff_head txq_list;317 struct sk_buff *skb, *tmp;318 unsigned long flags;319 bool found = false;320 u32 mtype_seqid;321 322 mtype_seqid = event->high &323 ((MESSAGE_TYPE_MASK << MESSAGE_TYPE_SHIFT) |324 (SEQUENCE_ID_MASK << SEQUENCE_ID_SHIFT) |325 (EVENT_TYPE_MASK << EVENT_TYPE_SHIFT));326 327 __skb_queue_head_init(&txq_list);328 329 spin_lock_irqsave(&cpts->txq.lock, flags);330 skb_queue_splice_init(&cpts->txq, &txq_list);331 spin_unlock_irqrestore(&cpts->txq.lock, flags);332 333 skb_queue_walk_safe(&txq_list, skb, tmp) {334 struct skb_shared_hwtstamps ssh;335 struct cpts_skb_cb_data *skb_cb =336 (struct cpts_skb_cb_data *)skb->cb;337 338 if (mtype_seqid == skb_cb->skb_mtype_seqid) {339 memset(&ssh, 0, sizeof(ssh));340 ssh.hwtstamp = ns_to_ktime(event->timestamp);341 skb_tstamp_tx(skb, &ssh);342 found = true;343 __skb_unlink(skb, &txq_list);344 dev_consume_skb_any(skb);345 dev_dbg(cpts->dev, "match tx timestamp mtype_seqid %08x\n",346 mtype_seqid);347 break;348 }349 350 if (time_after(jiffies, skb_cb->tmo)) {351 /* timeout any expired skbs over 1s */352 dev_dbg(cpts->dev, "expiring tx timestamp from txq\n");353 __skb_unlink(skb, &txq_list);354 dev_consume_skb_any(skb);355 }356 }357 358 spin_lock_irqsave(&cpts->txq.lock, flags);359 skb_queue_splice(&txq_list, &cpts->txq);360 spin_unlock_irqrestore(&cpts->txq.lock, flags);361 362 return found;363}364 365static void cpts_process_events(struct cpts *cpts)366{367 struct list_head *this, *next;368 struct cpts_event *event;369 LIST_HEAD(events_free);370 unsigned long flags;371 LIST_HEAD(events);372 373 spin_lock_irqsave(&cpts->lock, flags);374 list_splice_init(&cpts->events, &events);375 spin_unlock_irqrestore(&cpts->lock, flags);376 377 list_for_each_safe(this, next, &events) {378 event = list_entry(this, struct cpts_event, list);379 if (cpts_match_tx_ts(cpts, event) ||380 time_after(jiffies, event->tmo)) {381 list_del_init(&event->list);382 list_add(&event->list, &events_free);383 }384 }385 386 spin_lock_irqsave(&cpts->lock, flags);387 list_splice_tail(&events, &cpts->events);388 list_splice_tail(&events_free, &cpts->pool);389 spin_unlock_irqrestore(&cpts->lock, flags);390}391 392static long cpts_overflow_check(struct ptp_clock_info *ptp)393{394 struct cpts *cpts = container_of(ptp, struct cpts, info);395 unsigned long delay = cpts->ov_check_period;396 unsigned long flags;397 u64 ns;398 399 mutex_lock(&cpts->ptp_clk_mutex);400 401 cpts_update_cur_time(cpts, -1, NULL);402 ns = timecounter_read(&cpts->tc);403 404 cpts_process_events(cpts);405 406 spin_lock_irqsave(&cpts->txq.lock, flags);407 if (!skb_queue_empty(&cpts->txq)) {408 cpts_purge_txq(cpts);409 if (!skb_queue_empty(&cpts->txq))410 delay = CPTS_SKB_TX_WORK_TIMEOUT;411 }412 spin_unlock_irqrestore(&cpts->txq.lock, flags);413 414 dev_dbg(cpts->dev, "cpts overflow check at %lld\n", ns);415 mutex_unlock(&cpts->ptp_clk_mutex);416 return (long)delay;417}418 419static const struct ptp_clock_info cpts_info = {420 .owner = THIS_MODULE,421 .name = "CTPS timer",422 .max_adj = 1000000,423 .n_ext_ts = 0,424 .n_pins = 0,425 .pps = 0,426 .adjfine = cpts_ptp_adjfine,427 .adjtime = cpts_ptp_adjtime,428 .gettimex64 = cpts_ptp_gettimeex,429 .settime64 = cpts_ptp_settime,430 .enable = cpts_ptp_enable,431 .do_aux_work = cpts_overflow_check,432};433 434static int cpts_skb_get_mtype_seqid(struct sk_buff *skb, u32 *mtype_seqid)435{436 unsigned int ptp_class = ptp_classify_raw(skb);437 struct ptp_header *hdr;438 u8 msgtype;439 u16 seqid;440 441 if (ptp_class == PTP_CLASS_NONE)442 return 0;443 444 hdr = ptp_parse_header(skb, ptp_class);445 if (!hdr)446 return 0;447 448 msgtype = ptp_get_msgtype(hdr, ptp_class);449 seqid = ntohs(hdr->sequence_id);450 451 *mtype_seqid = (msgtype & MESSAGE_TYPE_MASK) << MESSAGE_TYPE_SHIFT;452 *mtype_seqid |= (seqid & SEQUENCE_ID_MASK) << SEQUENCE_ID_SHIFT;453 454 return 1;455}456 457static u64 cpts_find_ts(struct cpts *cpts, struct sk_buff *skb,458 int ev_type, u32 skb_mtype_seqid)459{460 struct list_head *this, *next;461 struct cpts_event *event;462 unsigned long flags;463 u32 mtype_seqid;464 u64 ns = 0;465 466 cpts_fifo_read(cpts, -1);467 spin_lock_irqsave(&cpts->lock, flags);468 list_for_each_safe(this, next, &cpts->events) {469 event = list_entry(this, struct cpts_event, list);470 if (event_expired(event)) {471 list_del_init(&event->list);472 list_add(&event->list, &cpts->pool);473 continue;474 }475 476 mtype_seqid = event->high &477 ((MESSAGE_TYPE_MASK << MESSAGE_TYPE_SHIFT) |478 (SEQUENCE_ID_MASK << SEQUENCE_ID_SHIFT) |479 (EVENT_TYPE_MASK << EVENT_TYPE_SHIFT));480 481 if (mtype_seqid == skb_mtype_seqid) {482 ns = event->timestamp;483 list_del_init(&event->list);484 list_add(&event->list, &cpts->pool);485 break;486 }487 }488 spin_unlock_irqrestore(&cpts->lock, flags);489 490 return ns;491}492 493void cpts_rx_timestamp(struct cpts *cpts, struct sk_buff *skb)494{495 struct cpts_skb_cb_data *skb_cb = (struct cpts_skb_cb_data *)skb->cb;496 struct skb_shared_hwtstamps *ssh;497 int ret;498 u64 ns;499 500 /* cpts_rx_timestamp() is called before eth_type_trans(), so501 * skb MAC Hdr properties are not configured yet. Hence need to502 * reset skb MAC header here503 */504 skb_reset_mac_header(skb);505 ret = cpts_skb_get_mtype_seqid(skb, &skb_cb->skb_mtype_seqid);506 if (!ret)507 return;508 509 skb_cb->skb_mtype_seqid |= (CPTS_EV_RX << EVENT_TYPE_SHIFT);510 511 dev_dbg(cpts->dev, "%s mtype seqid %08x\n",512 __func__, skb_cb->skb_mtype_seqid);513 514 ns = cpts_find_ts(cpts, skb, CPTS_EV_RX, skb_cb->skb_mtype_seqid);515 if (!ns)516 return;517 ssh = skb_hwtstamps(skb);518 memset(ssh, 0, sizeof(*ssh));519 ssh->hwtstamp = ns_to_ktime(ns);520}521EXPORT_SYMBOL_GPL(cpts_rx_timestamp);522 523void cpts_tx_timestamp(struct cpts *cpts, struct sk_buff *skb)524{525 struct cpts_skb_cb_data *skb_cb = (struct cpts_skb_cb_data *)skb->cb;526 int ret;527 528 if (!(skb_shinfo(skb)->tx_flags & SKBTX_IN_PROGRESS))529 return;530 531 ret = cpts_skb_get_mtype_seqid(skb, &skb_cb->skb_mtype_seqid);532 if (!ret)533 return;534 535 skb_cb->skb_mtype_seqid |= (CPTS_EV_TX << EVENT_TYPE_SHIFT);536 537 dev_dbg(cpts->dev, "%s mtype seqid %08x\n",538 __func__, skb_cb->skb_mtype_seqid);539 540 /* Always defer TX TS processing to PTP worker */541 skb_get(skb);542 /* get the timestamp for timeouts */543 skb_cb->tmo = jiffies + msecs_to_jiffies(CPTS_SKB_RX_TX_TMO);544 skb_queue_tail(&cpts->txq, skb);545 ptp_schedule_worker(cpts->clock, 0);546}547EXPORT_SYMBOL_GPL(cpts_tx_timestamp);548 549int cpts_register(struct cpts *cpts)550{551 int err, i;552 553 skb_queue_head_init(&cpts->txq);554 INIT_LIST_HEAD(&cpts->events);555 INIT_LIST_HEAD(&cpts->pool);556 for (i = 0; i < CPTS_MAX_EVENTS; i++)557 list_add(&cpts->pool_data[i].list, &cpts->pool);558 559 err = clk_enable(cpts->refclk);560 if (err)561 return err;562 563 cpts_write32(cpts, CPTS_EN, control);564 cpts_write32(cpts, TS_PEND_EN, int_enable);565 566 timecounter_init(&cpts->tc, &cpts->cc, ktime_get_real_ns());567 568 cpts->clock = ptp_clock_register(&cpts->info, cpts->dev);569 if (IS_ERR(cpts->clock)) {570 err = PTR_ERR(cpts->clock);571 cpts->clock = NULL;572 goto err_ptp;573 }574 cpts->phc_index = ptp_clock_index(cpts->clock);575 576 ptp_schedule_worker(cpts->clock, cpts->ov_check_period);577 return 0;578 579err_ptp:580 clk_disable(cpts->refclk);581 return err;582}583EXPORT_SYMBOL_GPL(cpts_register);584 585void cpts_unregister(struct cpts *cpts)586{587 if (WARN_ON(!cpts->clock))588 return;589 590 ptp_clock_unregister(cpts->clock);591 cpts->clock = NULL;592 cpts->phc_index = -1;593 594 cpts_write32(cpts, 0, int_enable);595 cpts_write32(cpts, 0, control);596 597 /* Drop all packet */598 skb_queue_purge(&cpts->txq);599 600 clk_disable(cpts->refclk);601}602EXPORT_SYMBOL_GPL(cpts_unregister);603 604static void cpts_calc_mult_shift(struct cpts *cpts)605{606 u64 frac, maxsec, ns;607 u32 freq;608 609 freq = clk_get_rate(cpts->refclk);610 611 /* Calc the maximum number of seconds which we can run before612 * wrapping around.613 */614 maxsec = cpts->cc.mask;615 do_div(maxsec, freq);616 /* limit conversation rate to 10 sec as higher values will produce617 * too small mult factors and so reduce the conversion accuracy618 */619 if (maxsec > 10)620 maxsec = 10;621 622 /* Calc overflow check period (maxsec / 2) */623 cpts->ov_check_period = (HZ * maxsec) / 2;624 dev_info(cpts->dev, "cpts: overflow check period %lu (jiffies)\n",625 cpts->ov_check_period);626 627 if (cpts->cc.mult || cpts->cc.shift)628 return;629 630 clocks_calc_mult_shift(&cpts->cc.mult, &cpts->cc.shift,631 freq, NSEC_PER_SEC, maxsec);632 633 frac = 0;634 ns = cyclecounter_cyc2ns(&cpts->cc, freq, cpts->cc.mask, &frac);635 636 dev_info(cpts->dev,637 "CPTS: ref_clk_freq:%u calc_mult:%u calc_shift:%u error:%lld nsec/sec\n",638 freq, cpts->cc.mult, cpts->cc.shift, (ns - NSEC_PER_SEC));639}640 641static void cpts_clk_unregister(void *clk)642{643 clk_hw_unregister_mux(clk);644}645 646static void cpts_clk_del_provider(void *np)647{648 of_clk_del_provider(np);649}650 651static int cpts_of_mux_clk_setup(struct cpts *cpts, struct device_node *node)652{653 struct device_node *refclk_np;654 const char **parent_names;655 unsigned int num_parents;656 struct clk_hw *clk_hw;657 int ret = -EINVAL;658 u32 *mux_table;659 660 refclk_np = of_get_child_by_name(node, "cpts-refclk-mux");661 if (!refclk_np)662 /* refclk selection supported not for all SoCs */663 return 0;664 665 num_parents = of_clk_get_parent_count(refclk_np);666 if (num_parents < 1) {667 dev_err(cpts->dev, "mux-clock %s must have parents\n",668 refclk_np->name);669 goto mux_fail;670 }671 672 parent_names = devm_kcalloc(cpts->dev, num_parents,673 sizeof(*parent_names), GFP_KERNEL);674 675 mux_table = devm_kcalloc(cpts->dev, num_parents, sizeof(*mux_table),676 GFP_KERNEL);677 if (!mux_table || !parent_names) {678 ret = -ENOMEM;679 goto mux_fail;680 }681 682 of_clk_parent_fill(refclk_np, parent_names, num_parents);683 684 ret = of_property_read_variable_u32_array(refclk_np, "ti,mux-tbl",685 mux_table,686 num_parents, num_parents);687 if (ret < 0)688 goto mux_fail;689 690 clk_hw = clk_hw_register_mux_table(cpts->dev, refclk_np->name,691 parent_names, num_parents,692 0,693 &cpts->reg->rftclk_sel, 0, 0x1F,694 0, mux_table, NULL);695 if (IS_ERR(clk_hw)) {696 ret = PTR_ERR(clk_hw);697 goto mux_fail;698 }699 700 ret = devm_add_action_or_reset(cpts->dev, cpts_clk_unregister, clk_hw);701 if (ret) {702 dev_err(cpts->dev, "add clkmux unreg action %d", ret);703 goto mux_fail;704 }705 706 ret = of_clk_add_hw_provider(refclk_np, of_clk_hw_simple_get, clk_hw);707 if (ret)708 goto mux_fail;709 710 ret = devm_add_action_or_reset(cpts->dev, cpts_clk_del_provider,711 refclk_np);712 if (ret) {713 dev_err(cpts->dev, "add clkmux provider unreg action %d", ret);714 goto mux_fail;715 }716 717 return ret;718 719mux_fail:720 of_node_put(refclk_np);721 return ret;722}723 724static int cpts_of_parse(struct cpts *cpts, struct device_node *node)725{726 int ret = -EINVAL;727 u32 prop;728 729 if (!of_property_read_u32(node, "cpts_clock_mult", &prop))730 cpts->cc.mult = prop;731 732 if (!of_property_read_u32(node, "cpts_clock_shift", &prop))733 cpts->cc.shift = prop;734 735 if ((cpts->cc.mult && !cpts->cc.shift) ||736 (!cpts->cc.mult && cpts->cc.shift))737 goto of_error;738 739 return cpts_of_mux_clk_setup(cpts, node);740 741of_error:742 dev_err(cpts->dev, "CPTS: Missing property in the DT.\n");743 return ret;744}745 746struct cpts *cpts_create(struct device *dev, void __iomem *regs,747 struct device_node *node, u32 n_ext_ts)748{749 struct cpts *cpts;750 int ret;751 752 cpts = devm_kzalloc(dev, sizeof(*cpts), GFP_KERNEL);753 if (!cpts)754 return ERR_PTR(-ENOMEM);755 756 cpts->dev = dev;757 cpts->reg = (struct cpsw_cpts __iomem *)regs;758 cpts->irq_poll = true;759 spin_lock_init(&cpts->lock);760 mutex_init(&cpts->ptp_clk_mutex);761 init_completion(&cpts->ts_push_complete);762 763 ret = cpts_of_parse(cpts, node);764 if (ret)765 return ERR_PTR(ret);766 767 cpts->refclk = devm_get_clk_from_child(dev, node, "cpts");768 if (IS_ERR(cpts->refclk))769 /* try get clk from dev node for compatibility */770 cpts->refclk = devm_clk_get(dev, "cpts");771 772 if (IS_ERR(cpts->refclk)) {773 dev_err(dev, "Failed to get cpts refclk %ld\n",774 PTR_ERR(cpts->refclk));775 return ERR_CAST(cpts->refclk);776 }777 778 ret = clk_prepare(cpts->refclk);779 if (ret)780 return ERR_PTR(ret);781 782 cpts->cc.read = cpts_systim_read;783 cpts->cc.mask = CLOCKSOURCE_MASK(32);784 cpts->info = cpts_info;785 cpts->phc_index = -1;786 787 if (n_ext_ts)788 cpts->info.n_ext_ts = n_ext_ts;789 790 cpts_calc_mult_shift(cpts);791 /* save cc.mult original value as it can be modified792 * by cpts_ptp_adjfine().793 */794 cpts->cc_mult = cpts->cc.mult;795 796 return cpts;797}798EXPORT_SYMBOL_GPL(cpts_create);799 800void cpts_release(struct cpts *cpts)801{802 if (!cpts)803 return;804 805 if (WARN_ON(!cpts->refclk))806 return;807 808 clk_unprepare(cpts->refclk);809}810EXPORT_SYMBOL_GPL(cpts_release);811 812MODULE_LICENSE("GPL v2");813MODULE_DESCRIPTION("TI CPTS driver");814MODULE_AUTHOR("Richard Cochran <richardcochran@gmail.com>");815