[deliverable/linux.git] / drivers / net / ethernet / ti / cpts.c

/*
 * TI Common Platform Time Sync
 *
 * Copyright (C) 2012 Richard Cochran <richardcochran@gmail.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */
#include <linux/err.h>
#include <linux/if.h>
#include <linux/hrtimer.h>
#include <linux/module.h>
#include <linux/net_tstamp.h>
#include <linux/ptp_classify.h>
#include <linux/time.h>
#include <linux/uaccess.h>
#include <linux/workqueue.h>
#include <linux/if_ether.h>
#include <linux/if_vlan.h>

#include "cpts.h"

#ifdef CONFIG_TI_CPTS

#define cpts_read32(c, r)	__raw_readl(&c->reg->r)
#define cpts_write32(c, v, r)	__raw_writel(v, &c->reg->r)

static int event_expired(struct cpts_event *event)
{
	return time_after(jiffies, event->tmo);
}

static int event_type(struct cpts_event *event)
{
	return (event->high >> EVENT_TYPE_SHIFT) & EVENT_TYPE_MASK;
}

static int cpts_fifo_pop(struct cpts *cpts, u32 *high, u32 *low)
{
	u32 r = cpts_read32(cpts, intstat_raw);

	if (r & TS_PEND_RAW) {
		*high = cpts_read32(cpts, event_high);
		*low  = cpts_read32(cpts, event_low);
		cpts_write32(cpts, EVENT_POP, event_pop);
		return 0;
	}
	return -1;
}

/*
 * Returns zero if matching event type was found.
 */
static int cpts_fifo_read(struct cpts *cpts, int match)
{
	int i, type = -1;
	u32 hi, lo;
	struct cpts_event *event;

	for (i = 0; i < CPTS_FIFO_DEPTH; i++) {
		if (cpts_fifo_pop(cpts, &hi, &lo))
			break;
		if (list_empty(&cpts->pool)) {
			pr_err("cpts: event pool is empty\n");
			return -1;
		}
		event = list_first_entry(&cpts->pool, struct cpts_event, list);
		event->tmo = jiffies + 2;
		event->high = hi;
		event->low = lo;
		type = event_type(event);
		switch (type) {
		case CPTS_EV_PUSH:
		case CPTS_EV_RX:
		case CPTS_EV_TX:
			list_del_init(&event->list);
			list_add_tail(&event->list, &cpts->events);
			break;
		case CPTS_EV_ROLL:
		case CPTS_EV_HALF:
		case CPTS_EV_HW:
			break;
		default:
			pr_err("cpts: unknown event type\n");
			break;
		}
		if (type == match)
			break;
	}
	return type == match ? 0 : -1;
}

static cycle_t cpts_systim_read(const struct cyclecounter *cc)
{
	u64 val = 0;
	struct cpts_event *event;
	struct list_head *this, *next;
	struct cpts *cpts = container_of(cc, struct cpts, cc);

	cpts_write32(cpts, TS_PUSH, ts_push);
	if (cpts_fifo_read(cpts, CPTS_EV_PUSH))
		pr_err("cpts: unable to obtain a time stamp\n");

	list_for_each_safe(this, next, &cpts->events) {
		event = list_entry(this, struct cpts_event, list);
		if (event_type(event) == CPTS_EV_PUSH) {
			list_del_init(&event->list);
			list_add(&event->list, &cpts->pool);
			val = event->low;
			break;
		}
	}

	return val;
}

/* PTP clock operations */

static int cpts_ptp_adjfreq(struct ptp_clock_info *ptp, s32 ppb)
{
	u64 adj;
	u32 diff, mult;
	int neg_adj = 0;
	unsigned long flags;
	struct cpts *cpts = container_of(ptp, struct cpts, info);

	if (ppb < 0) {
		neg_adj = 1;
		ppb = -ppb;
	}
	mult = cpts->cc_mult;
	adj = mult;
	adj *= ppb;
	diff = div_u64(adj, 1000000000ULL);

	spin_lock_irqsave(&cpts->lock, flags);

	timecounter_read(&cpts->tc);

	cpts->cc.mult = neg_adj ? mult - diff : mult + diff;

	spin_unlock_irqrestore(&cpts->lock, flags);

	return 0;
}

static int cpts_ptp_adjtime(struct ptp_clock_info *ptp, s64 delta)
{
	unsigned long flags;
	struct cpts *cpts = container_of(ptp, struct cpts, info);

	spin_lock_irqsave(&cpts->lock, flags);
	timecounter_adjtime(&cpts->tc, delta);
	spin_unlock_irqrestore(&cpts->lock, flags);

	return 0;
}

static int cpts_ptp_gettime(struct ptp_clock_info *ptp, struct timespec64 *ts)
{
	u64 ns;
	unsigned long flags;
	struct cpts *cpts = container_of(ptp, struct cpts, info);

	spin_lock_irqsave(&cpts->lock, flags);
	ns = timecounter_read(&cpts->tc);
	spin_unlock_irqrestore(&cpts->lock, flags);

	*ts = ns_to_timespec64(ns);

	return 0;
}

static int cpts_ptp_settime(struct ptp_clock_info *ptp,
			    const struct timespec64 *ts)
{
	u64 ns;
	unsigned long flags;
	struct cpts *cpts = container_of(ptp, struct cpts, info);

	ns = timespec64_to_ns(ts);

	spin_lock_irqsave(&cpts->lock, flags);
	timecounter_init(&cpts->tc, &cpts->cc, ns);
	spin_unlock_irqrestore(&cpts->lock, flags);

	return 0;
}

static int cpts_ptp_enable(struct ptp_clock_info *ptp,
			   struct ptp_clock_request *rq, int on)
{
	return -EOPNOTSUPP;
}

static struct ptp_clock_info cpts_info = {
	.owner		= THIS_MODULE,
	.name		= "CTPS timer",
	.max_adj	= 1000000,
	.n_ext_ts	= 0,
	.n_pins		= 0,
	.pps		= 0,
	.adjfreq	= cpts_ptp_adjfreq,
	.adjtime	= cpts_ptp_adjtime,
	.gettime64	= cpts_ptp_gettime,
	.settime64	= cpts_ptp_settime,
	.enable		= cpts_ptp_enable,
};

static void cpts_overflow_check(struct work_struct *work)
{
	struct timespec64 ts;
	struct cpts *cpts = container_of(work, struct cpts, overflow_work.work);

	cpts_write32(cpts, CPTS_EN, control);
	cpts_write32(cpts, TS_PEND_EN, int_enable);
	cpts_ptp_gettime(&cpts->info, &ts);
	pr_debug("cpts overflow check at %lld.%09lu\n", ts.tv_sec, ts.tv_nsec);
	schedule_delayed_work(&cpts->overflow_work, CPTS_OVERFLOW_PERIOD);
}

static void cpts_clk_init(struct device *dev, struct cpts *cpts)
{
	cpts->refclk = devm_clk_get(dev, "cpts");
	if (IS_ERR(cpts->refclk)) {
		dev_err(dev, "Failed to get cpts refclk\n");
		cpts->refclk = NULL;
		return;
	}
	clk_prepare_enable(cpts->refclk);
}

static void cpts_clk_release(struct cpts *cpts)
{
	clk_disable(cpts->refclk);
}

static int cpts_match(struct sk_buff *skb, unsigned int ptp_class,
		      u16 ts_seqid, u8 ts_msgtype)
{
	u16 *seqid;
	unsigned int offset = 0;
	u8 *msgtype, *data = skb->data;

	if (ptp_class & PTP_CLASS_VLAN)
		offset += VLAN_HLEN;

	switch (ptp_class & PTP_CLASS_PMASK) {
	case PTP_CLASS_IPV4:
		offset += ETH_HLEN + IPV4_HLEN(data + offset) + UDP_HLEN;
		break;
	case PTP_CLASS_IPV6:
		offset += ETH_HLEN + IP6_HLEN + UDP_HLEN;
		break;
	case PTP_CLASS_L2:
		offset += ETH_HLEN;
		break;
	default:
		return 0;
	}

	if (skb->len + ETH_HLEN < offset + OFF_PTP_SEQUENCE_ID + sizeof(*seqid))
		return 0;

	if (unlikely(ptp_class & PTP_CLASS_V1))
		msgtype = data + offset + OFF_PTP_CONTROL;
	else
		msgtype = data + offset;

	seqid = (u16 *)(data + offset + OFF_PTP_SEQUENCE_ID);

	return (ts_msgtype == (*msgtype & 0xf) && ts_seqid == ntohs(*seqid));
}

static u64 cpts_find_ts(struct cpts *cpts, struct sk_buff *skb, int ev_type)
{
	u64 ns = 0;
	struct cpts_event *event;
	struct list_head *this, *next;
	unsigned int class = ptp_classify_raw(skb);
	unsigned long flags;
	u16 seqid;
	u8 mtype;

	if (class == PTP_CLASS_NONE)
		return 0;

	spin_lock_irqsave(&cpts->lock, flags);
	cpts_fifo_read(cpts, CPTS_EV_PUSH);
	list_for_each_safe(this, next, &cpts->events) {
		event = list_entry(this, struct cpts_event, list);
		if (event_expired(event)) {
			list_del_init(&event->list);
			list_add(&event->list, &cpts->pool);
			continue;
		}
		mtype = (event->high >> MESSAGE_TYPE_SHIFT) & MESSAGE_TYPE_MASK;
		seqid = (event->high >> SEQUENCE_ID_SHIFT) & SEQUENCE_ID_MASK;
		if (ev_type == event_type(event) &&
		    cpts_match(skb, class, seqid, mtype)) {
			ns = timecounter_cyc2time(&cpts->tc, event->low);
			list_del_init(&event->list);
			list_add(&event->list, &cpts->pool);
			break;
		}
	}
	spin_unlock_irqrestore(&cpts->lock, flags);

	return ns;
}

void cpts_rx_timestamp(struct cpts *cpts, struct sk_buff *skb)
{
	u64 ns;
	struct skb_shared_hwtstamps *ssh;

	if (!cpts->rx_enable)
		return;
	ns = cpts_find_ts(cpts, skb, CPTS_EV_RX);
	if (!ns)
		return;
	ssh = skb_hwtstamps(skb);
	memset(ssh, 0, sizeof(*ssh));
	ssh->hwtstamp = ns_to_ktime(ns);
}

void cpts_tx_timestamp(struct cpts *cpts, struct sk_buff *skb)
{
	u64 ns;
	struct skb_shared_hwtstamps ssh;

	if (!(skb_shinfo(skb)->tx_flags & SKBTX_IN_PROGRESS))
		return;
	ns = cpts_find_ts(cpts, skb, CPTS_EV_TX);
	if (!ns)
		return;
	memset(&ssh, 0, sizeof(ssh));
	ssh.hwtstamp = ns_to_ktime(ns);
	skb_tstamp_tx(skb, &ssh);
}

#endif /*CONFIG_TI_CPTS*/

int cpts_register(struct device *dev, struct cpts *cpts,
		  u32 mult, u32 shift)
{
#ifdef CONFIG_TI_CPTS
	int err, i;
	unsigned long flags;

	cpts->info = cpts_info;
	cpts->clock = ptp_clock_register(&cpts->info, dev);
	if (IS_ERR(cpts->clock)) {
		err = PTR_ERR(cpts->clock);
		cpts->clock = NULL;
		return err;
	}
	spin_lock_init(&cpts->lock);

	cpts->cc.read = cpts_systim_read;
	cpts->cc.mask = CLOCKSOURCE_MASK(32);
	cpts->cc_mult = mult;
	cpts->cc.mult = mult;
	cpts->cc.shift = shift;

	INIT_LIST_HEAD(&cpts->events);
	INIT_LIST_HEAD(&cpts->pool);
	for (i = 0; i < CPTS_MAX_EVENTS; i++)
		list_add(&cpts->pool_data[i].list, &cpts->pool);

	cpts_clk_init(dev, cpts);
	cpts_write32(cpts, CPTS_EN, control);
	cpts_write32(cpts, TS_PEND_EN, int_enable);

	spin_lock_irqsave(&cpts->lock, flags);
	timecounter_init(&cpts->tc, &cpts->cc, ktime_to_ns(ktime_get_real()));
	spin_unlock_irqrestore(&cpts->lock, flags);

	INIT_DELAYED_WORK(&cpts->overflow_work, cpts_overflow_check);
	schedule_delayed_work(&cpts->overflow_work, CPTS_OVERFLOW_PERIOD);

	cpts->phc_index = ptp_clock_index(cpts->clock);
#endif
	return 0;
}

void cpts_unregister(struct cpts *cpts)
{
#ifdef CONFIG_TI_CPTS
	if (cpts->clock) {
		ptp_clock_unregister(cpts->clock);
		cancel_delayed_work_sync(&cpts->overflow_work);
	}
	if (cpts->refclk)
		cpts_clk_release(cpts);
#endif
}
Commit	Line	Data
87c0e764 RC	1	/*
	2	* TI Common Platform Time Sync
	3	*
	4	* Copyright (C) 2012 Richard Cochran <richardcochran@gmail.com>
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License as published by
	8	* the Free Software Foundation; either version 2 of the License, or
	9	* (at your option) any later version.
	10	*
	11	* This program is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	* GNU General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU General Public License
	17	* along with this program; if not, write to the Free Software
	18	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
	19	*/
	20	#include <linux/err.h>
	21	#include <linux/if.h>
	22	#include <linux/hrtimer.h>
	23	#include <linux/module.h>
	24	#include <linux/net_tstamp.h>
	25	#include <linux/ptp_classify.h>
	26	#include <linux/time.h>
	27	#include <linux/uaccess.h>
	28	#include <linux/workqueue.h>
79eb9d28 AS	29	#include <linux/if_ether.h>
79eb9d28 AS	30	#include <linux/if_vlan.h>
87c0e764	31
87c0e764 RC	32	#include "cpts.h"
	33
	34	#ifdef CONFIG_TI_CPTS
	35
87c0e764 RC	36	#define cpts_read32(c, r) __raw_readl(&c->reg->r)
	37	#define cpts_write32(c, v, r) __raw_writel(v, &c->reg->r)
	38
	39	static int event_expired(struct cpts_event *event)
	40	{
	41	return time_after(jiffies, event->tmo);
	42	}
	43
	44	static int event_type(struct cpts_event *event)
	45	{
	46	return (event->high >> EVENT_TYPE_SHIFT) & EVENT_TYPE_MASK;
	47	}
	48
	49	static int cpts_fifo_pop(struct cpts cpts, u32 high, u32 *low)
	50	{
	51	u32 r = cpts_read32(cpts, intstat_raw);
	52
	53	if (r & TS_PEND_RAW) {
	54	*high = cpts_read32(cpts, event_high);
	55	*low = cpts_read32(cpts, event_low);
	56	cpts_write32(cpts, EVENT_POP, event_pop);
	57	return 0;
	58	}
	59	return -1;
	60	}
	61
	62	/*
	63	* Returns zero if matching event type was found.
	64	*/
	65	static int cpts_fifo_read(struct cpts *cpts, int match)
	66	{
	67	int i, type = -1;
	68	u32 hi, lo;
	69	struct cpts_event *event;
	70
	71	for (i = 0; i < CPTS_FIFO_DEPTH; i++) {
	72	if (cpts_fifo_pop(cpts, &hi, &lo))
	73	break;
	74	if (list_empty(&cpts->pool)) {
	75	pr_err("cpts: event pool is empty\n");
	76	return -1;
	77	}
	78	event = list_first_entry(&cpts->pool, struct cpts_event, list);
	79	event->tmo = jiffies + 2;
	80	event->high = hi;
	81	event->low = lo;
	82	type = event_type(event);
	83	switch (type) {
	84	case CPTS_EV_PUSH:
	85	case CPTS_EV_RX:
	86	case CPTS_EV_TX:
	87	list_del_init(&event->list);
	88	list_add_tail(&event->list, &cpts->events);
	89	break;
	90	case CPTS_EV_ROLL:
	91	case CPTS_EV_HALF:
	92	case CPTS_EV_HW:
	93	break;
	94	default:
07f42258	95	pr_err("cpts: unknown event type\n");
87c0e764 RC	96	break;
	97	}
	98	if (type == match)
	99	break;
	100	}
	101	return type == match ? 0 : -1;
	102	}
	103
	104	static cycle_t cpts_systim_read(const struct cyclecounter *cc)
	105	{
	106	u64 val = 0;
	107	struct cpts_event *event;
	108	struct list_head this, next;
	109	struct cpts *cpts = container_of(cc, struct cpts, cc);
	110
	111	cpts_write32(cpts, TS_PUSH, ts_push);
	112	if (cpts_fifo_read(cpts, CPTS_EV_PUSH))
	113	pr_err("cpts: unable to obtain a time stamp\n");
	114
	115	list_for_each_safe(this, next, &cpts->events) {
	116	event = list_entry(this, struct cpts_event, list);
	117	if (event_type(event) == CPTS_EV_PUSH) {
	118	list_del_init(&event->list);
	119	list_add(&event->list, &cpts->pool);
	120	val = event->low;
	121	break;
	122	}
	123	}
	124
	125	return val;
	126	}
	127
	128	/* PTP clock operations */
	129
	130	static int cpts_ptp_adjfreq(struct ptp_clock_info *ptp, s32 ppb)
	131	{
	132	u64 adj;
	133	u32 diff, mult;
	134	int neg_adj = 0;
	135	unsigned long flags;
	136	struct cpts *cpts = container_of(ptp, struct cpts, info);
	137
	138	if (ppb < 0) {
	139	neg_adj = 1;
	140	ppb = -ppb;
	141	}
	142	mult = cpts->cc_mult;
	143	adj = mult;
	144	adj *= ppb;
	145	diff = div_u64(adj, 1000000000ULL);
	146
	147	spin_lock_irqsave(&cpts->lock, flags);
	148
	149	timecounter_read(&cpts->tc);
	150
	151	cpts->cc.mult = neg_adj ? mult - diff : mult + diff;
	152
	153	spin_unlock_irqrestore(&cpts->lock, flags);
	154
	155	return 0;
	156	}
	157
	158	static int cpts_ptp_adjtime(struct ptp_clock_info *ptp, s64 delta)
	159	{
87c0e764 RC	160	unsigned long flags;
	161	struct cpts *cpts = container_of(ptp, struct cpts, info);
	162
	163	spin_lock_irqsave(&cpts->lock, flags);
f25a30be	164	timecounter_adjtime(&cpts->tc, delta);
87c0e764 RC	165	spin_unlock_irqrestore(&cpts->lock, flags);
	166
	167	return 0;
	168	}
	169
a5c79c26	170	static int cpts_ptp_gettime(struct ptp_clock_info ptp, struct timespec64 ts)
87c0e764 RC	171	{
87c0e764 RC	172	u64 ns;
87c0e764 RC	173	unsigned long flags;
	174	struct cpts *cpts = container_of(ptp, struct cpts, info);
	175
	176	spin_lock_irqsave(&cpts->lock, flags);
	177	ns = timecounter_read(&cpts->tc);
	178	spin_unlock_irqrestore(&cpts->lock, flags);
	179
84d923ce	180	*ts = ns_to_timespec64(ns);
87c0e764 RC	181
	182	return 0;
	183	}
	184
	185	static int cpts_ptp_settime(struct ptp_clock_info *ptp,
a5c79c26	186	const struct timespec64 *ts)
87c0e764 RC	187	{
	188	u64 ns;
	189	unsigned long flags;
	190	struct cpts *cpts = container_of(ptp, struct cpts, info);
	191
84d923ce	192	ns = timespec64_to_ns(ts);
87c0e764 RC	193
	194	spin_lock_irqsave(&cpts->lock, flags);
	195	timecounter_init(&cpts->tc, &cpts->cc, ns);
	196	spin_unlock_irqrestore(&cpts->lock, flags);
	197
	198	return 0;
	199	}
	200
	201	static int cpts_ptp_enable(struct ptp_clock_info *ptp,
	202	struct ptp_clock_request *rq, int on)
	203	{
	204	return -EOPNOTSUPP;
	205	}
	206
	207	static struct ptp_clock_info cpts_info = {
	208	.owner = THIS_MODULE,
	209	.name = "CTPS timer",
	210	.max_adj = 1000000,
	211	.n_ext_ts = 0,
4986b4f0	212	.n_pins = 0,
87c0e764 RC	213	.pps = 0,
	214	.adjfreq = cpts_ptp_adjfreq,
	215	.adjtime = cpts_ptp_adjtime,
a5c79c26 RC	216	.gettime64 = cpts_ptp_gettime,
a5c79c26 RC	217	.settime64 = cpts_ptp_settime,
87c0e764 RC	218	.enable = cpts_ptp_enable,
	219	};
	220
	221	static void cpts_overflow_check(struct work_struct *work)
	222	{
a5c79c26	223	struct timespec64 ts;
87c0e764 RC	224	struct cpts *cpts = container_of(work, struct cpts, overflow_work.work);
	225
	226	cpts_write32(cpts, CPTS_EN, control);
	227	cpts_write32(cpts, TS_PEND_EN, int_enable);
	228	cpts_ptp_gettime(&cpts->info, &ts);
a5c79c26	229	pr_debug("cpts overflow check at %lld.%09lu\n", ts.tv_sec, ts.tv_nsec);
87c0e764 RC	230	schedule_delayed_work(&cpts->overflow_work, CPTS_OVERFLOW_PERIOD);
	231	}
	232
d0415e7c	233	static void cpts_clk_init(struct device dev, struct cpts cpts)
87c0e764	234	{
d0415e7c	235	cpts->refclk = devm_clk_get(dev, "cpts");
87c0e764	236	if (IS_ERR(cpts->refclk)) {
d0415e7c	237	dev_err(dev, "Failed to get cpts refclk\n");
87c0e764 RC	238	cpts->refclk = NULL;
	239	return;
	240	}
ccb6e984	241	clk_prepare_enable(cpts->refclk);
87c0e764 RC	242	}
	243
	244	static void cpts_clk_release(struct cpts *cpts)
	245	{
	246	clk_disable(cpts->refclk);
87c0e764 RC	247	}
	248
	249	static int cpts_match(struct sk_buff *skb, unsigned int ptp_class,
	250	u16 ts_seqid, u8 ts_msgtype)
	251	{
	252	u16 *seqid;
ae5c6c6d	253	unsigned int offset = 0;
87c0e764 RC	254	u8 msgtype, data = skb->data;
87c0e764 RC	255
ae5c6c6d SS	256	if (ptp_class & PTP_CLASS_VLAN)
	257	offset += VLAN_HLEN;
	258
	259	switch (ptp_class & PTP_CLASS_PMASK) {
	260	case PTP_CLASS_IPV4:
cca04b28	261	offset += ETH_HLEN + IPV4_HLEN(data + offset) + UDP_HLEN;
87c0e764	262	break;
ae5c6c6d SS	263	case PTP_CLASS_IPV6:
ae5c6c6d SS	264	offset += ETH_HLEN + IP6_HLEN + UDP_HLEN;
87c0e764	265	break;
ae5c6c6d SS	266	case PTP_CLASS_L2:
ae5c6c6d SS	267	offset += ETH_HLEN;
87c0e764 RC	268	break;
	269	default:
	270	return 0;
	271	}
	272
	273	if (skb->len + ETH_HLEN < offset + OFF_PTP_SEQUENCE_ID + sizeof(*seqid))
	274	return 0;
	275
	276	if (unlikely(ptp_class & PTP_CLASS_V1))
	277	msgtype = data + offset + OFF_PTP_CONTROL;
	278	else
	279	msgtype = data + offset;
	280
	281	seqid = (u16 *)(data + offset + OFF_PTP_SEQUENCE_ID);
	282
	283	return (ts_msgtype == (msgtype & 0xf) && ts_seqid == ntohs(seqid));
	284	}
	285
	286	static u64 cpts_find_ts(struct cpts cpts, struct sk_buff skb, int ev_type)
	287	{
	288	u64 ns = 0;
	289	struct cpts_event *event;
	290	struct list_head this, next;
164d8c66	291	unsigned int class = ptp_classify_raw(skb);
87c0e764 RC	292	unsigned long flags;
	293	u16 seqid;
	294	u8 mtype;
	295
	296	if (class == PTP_CLASS_NONE)
	297	return 0;
	298
	299	spin_lock_irqsave(&cpts->lock, flags);
	300	cpts_fifo_read(cpts, CPTS_EV_PUSH);
	301	list_for_each_safe(this, next, &cpts->events) {
	302	event = list_entry(this, struct cpts_event, list);
	303	if (event_expired(event)) {
	304	list_del_init(&event->list);
	305	list_add(&event->list, &cpts->pool);
	306	continue;
	307	}
	308	mtype = (event->high >> MESSAGE_TYPE_SHIFT) & MESSAGE_TYPE_MASK;
	309	seqid = (event->high >> SEQUENCE_ID_SHIFT) & SEQUENCE_ID_MASK;
	310	if (ev_type == event_type(event) &&
	311	cpts_match(skb, class, seqid, mtype)) {
	312	ns = timecounter_cyc2time(&cpts->tc, event->low);
	313	list_del_init(&event->list);
	314	list_add(&event->list, &cpts->pool);
	315	break;
	316	}
	317	}
	318	spin_unlock_irqrestore(&cpts->lock, flags);
	319
	320	return ns;
	321	}
	322
	323	void cpts_rx_timestamp(struct cpts cpts, struct sk_buff skb)
	324	{
	325	u64 ns;
	326	struct skb_shared_hwtstamps *ssh;
	327
	328	if (!cpts->rx_enable)
	329	return;
	330	ns = cpts_find_ts(cpts, skb, CPTS_EV_RX);
	331	if (!ns)
	332	return;
	333	ssh = skb_hwtstamps(skb);
	334	memset(ssh, 0, sizeof(*ssh));
	335	ssh->hwtstamp = ns_to_ktime(ns);
	336	}
	337
	338	void cpts_tx_timestamp(struct cpts cpts, struct sk_buff skb)
	339	{
	340	u64 ns;
	341	struct skb_shared_hwtstamps ssh;
	342
	343	if (!(skb_shinfo(skb)->tx_flags & SKBTX_IN_PROGRESS))
	344	return;
	345	ns = cpts_find_ts(cpts, skb, CPTS_EV_TX);
	346	if (!ns)
	347	return;
	348	memset(&ssh, 0, sizeof(ssh));
	349	ssh.hwtstamp = ns_to_ktime(ns);
	350	skb_tstamp_tx(skb, &ssh);
	351	}
	352
	353	#endif /CONFIG_TI_CPTS/
	354
	355	int cpts_register(struct device dev, struct cpts cpts,
356	u32 mult, u32 shift)
357	{
358	#ifdef CONFIG_TI_CPTS
359	int err, i;
360	unsigned long flags;
361
87c0e764 RC	362	cpts->info = cpts_info;
	363	cpts->clock = ptp_clock_register(&cpts->info, dev);
	364	if (IS_ERR(cpts->clock)) {
	365	err = PTR_ERR(cpts->clock);
	366	cpts->clock = NULL;
	367	return err;
	368	}
	369	spin_lock_init(&cpts->lock);
	370
	371	cpts->cc.read = cpts_systim_read;
	372	cpts->cc.mask = CLOCKSOURCE_MASK(32);
	373	cpts->cc_mult = mult;
	374	cpts->cc.mult = mult;
	375	cpts->cc.shift = shift;
	376
	377	INIT_LIST_HEAD(&cpts->events);
	378	INIT_LIST_HEAD(&cpts->pool);
	379	for (i = 0; i < CPTS_MAX_EVENTS; i++)
	380	list_add(&cpts->pool_data[i].list, &cpts->pool);
	381
d0415e7c	382	cpts_clk_init(dev, cpts);
87c0e764 RC	383	cpts_write32(cpts, CPTS_EN, control);
	384	cpts_write32(cpts, TS_PEND_EN, int_enable);
	385
	386	spin_lock_irqsave(&cpts->lock, flags);
	387	timecounter_init(&cpts->tc, &cpts->cc, ktime_to_ns(ktime_get_real()));
	388	spin_unlock_irqrestore(&cpts->lock, flags);
	389
	390	INIT_DELAYED_WORK(&cpts->overflow_work, cpts_overflow_check);
	391	schedule_delayed_work(&cpts->overflow_work, CPTS_OVERFLOW_PERIOD);
	392
	393	cpts->phc_index = ptp_clock_index(cpts->clock);
	394	#endif
	395	return 0;
	396	}
	397
	398	void cpts_unregister(struct cpts *cpts)
	399	{
	400	#ifdef CONFIG_TI_CPTS
	401	if (cpts->clock) {
	402	ptp_clock_unregister(cpts->clock);
	403	cancel_delayed_work_sync(&cpts->overflow_work);
	404	}
	405	if (cpts->refclk)
	406	cpts_clk_release(cpts);
	407	#endif
	408	}