[mirror_ubuntu-artful-kernel.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 "cpts.h"

#ifdef CONFIG_TI_CPTS

static struct sock_filter ptp_filter[] = {
	PTP_FILTER
};

#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)
{
	s64 now;
	unsigned long flags;
	struct cpts *cpts = container_of(ptp, struct cpts, info);

	spin_lock_irqsave(&cpts->lock, flags);
	now = timecounter_read(&cpts->tc);
	now += delta;
	timecounter_init(&cpts->tc, &cpts->cc, now);
	spin_unlock_irqrestore(&cpts->lock, flags);

	return 0;
}

static int cpts_ptp_gettime(struct ptp_clock_info *ptp, struct timespec *ts)
{
	u64 ns;
	u32 remainder;
	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->tv_sec = div_u64_rem(ns, 1000000000, &remainder);
	ts->tv_nsec = remainder;

	return 0;
}

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

	ns = ts->tv_sec * 1000000000ULL;
	ns += ts->tv_nsec;

	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,
	.gettime	= cpts_ptp_gettime,
	.settime	= cpts_ptp_settime,
	.enable		= cpts_ptp_enable,
};

static void cpts_overflow_check(struct work_struct *work)
{
	struct timespec 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 %ld.%09lu\n", ts.tv_sec, ts.tv_nsec);
	schedule_delayed_work(&cpts->overflow_work, CPTS_OVERFLOW_PERIOD);
}

#define CPTS_REF_CLOCK_NAME "cpsw_cpts_rft_clk"

static void cpts_clk_init(struct cpts *cpts)
{
	cpts->refclk = clk_get(NULL, CPTS_REF_CLOCK_NAME);
	if (IS_ERR(cpts->refclk)) {
		pr_err("Failed to clk_get %s\n", CPTS_REF_CLOCK_NAME);
		cpts->refclk = NULL;
		return;
	}
	clk_prepare_enable(cpts->refclk);
}

static void cpts_clk_release(struct cpts *cpts)
{
	clk_disable(cpts->refclk);
	clk_put(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;
	u8 *msgtype, *data = skb->data;

	switch (ptp_class) {
	case PTP_CLASS_V1_IPV4:
	case PTP_CLASS_V2_IPV4:
		offset = ETH_HLEN + IPV4_HLEN(data) + UDP_HLEN;
		break;
	case PTP_CLASS_V1_IPV6:
	case PTP_CLASS_V2_IPV6:
		offset = OFF_PTP6;
		break;
	case PTP_CLASS_V2_L2:
		offset = ETH_HLEN;
		break;
	case PTP_CLASS_V2_VLAN:
		offset = ETH_HLEN + VLAN_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 = sk_run_filter(skb, ptp_filter);
	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;

	if (ptp_filter_init(ptp_filter, ARRAY_SIZE(ptp_filter))) {
		pr_err("cpts: bad ptp filter\n");
		return -EINVAL;
	}
	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(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>
	29
87c0e764 RC	30	#include "cpts.h"
	31
	32	#ifdef CONFIG_TI_CPTS
	33
	34	static struct sock_filter ptp_filter[] = {
	35	PTP_FILTER
	36	};
	37
	38	#define cpts_read32(c, r) __raw_readl(&c->reg->r)
	39	#define cpts_write32(c, v, r) __raw_writel(v, &c->reg->r)
	40
	41	static int event_expired(struct cpts_event *event)
	42	{
	43	return time_after(jiffies, event->tmo);
	44	}
	45
	46	static int event_type(struct cpts_event *event)
	47	{
	48	return (event->high >> EVENT_TYPE_SHIFT) & EVENT_TYPE_MASK;
	49	}
	50
	51	static int cpts_fifo_pop(struct cpts cpts, u32 high, u32 *low)
	52	{
	53	u32 r = cpts_read32(cpts, intstat_raw);
	54
	55	if (r & TS_PEND_RAW) {
	56	*high = cpts_read32(cpts, event_high);
	57	*low = cpts_read32(cpts, event_low);
	58	cpts_write32(cpts, EVENT_POP, event_pop);
	59	return 0;
	60	}
	61	return -1;
	62	}
	63
	64	/*
	65	* Returns zero if matching event type was found.
	66	*/
	67	static int cpts_fifo_read(struct cpts *cpts, int match)
	68	{
	69	int i, type = -1;
	70	u32 hi, lo;
	71	struct cpts_event *event;
	72
	73	for (i = 0; i < CPTS_FIFO_DEPTH; i++) {
	74	if (cpts_fifo_pop(cpts, &hi, &lo))
	75	break;
	76	if (list_empty(&cpts->pool)) {
	77	pr_err("cpts: event pool is empty\n");
	78	return -1;
	79	}
	80	event = list_first_entry(&cpts->pool, struct cpts_event, list);
	81	event->tmo = jiffies + 2;
	82	event->high = hi;
	83	event->low = lo;
	84	type = event_type(event);
	85	switch (type) {
	86	case CPTS_EV_PUSH:
	87	case CPTS_EV_RX:
	88	case CPTS_EV_TX:
	89	list_del_init(&event->list);
	90	list_add_tail(&event->list, &cpts->events);
	91	break;
	92	case CPTS_EV_ROLL:
	93	case CPTS_EV_HALF:
94	case CPTS_EV_HW:
95	break;
96	default:
07f42258	97	pr_err("cpts: unknown event type\n");
87c0e764 RC	98	break;
	99	}
	100	if (type == match)
	101	break;
	102	}
	103	return type == match ? 0 : -1;
	104	}
	105
	106	static cycle_t cpts_systim_read(const struct cyclecounter *cc)
	107	{
	108	u64 val = 0;
	109	struct cpts_event *event;
	110	struct list_head this, next;
	111	struct cpts *cpts = container_of(cc, struct cpts, cc);
	112
	113	cpts_write32(cpts, TS_PUSH, ts_push);
	114	if (cpts_fifo_read(cpts, CPTS_EV_PUSH))
	115	pr_err("cpts: unable to obtain a time stamp\n");
	116
	117	list_for_each_safe(this, next, &cpts->events) {
	118	event = list_entry(this, struct cpts_event, list);
	119	if (event_type(event) == CPTS_EV_PUSH) {
	120	list_del_init(&event->list);
	121	list_add(&event->list, &cpts->pool);
	122	val = event->low;
	123	break;
	124	}
	125	}
	126
	127	return val;
	128	}
	129
	130	/* PTP clock operations */
	131
	132	static int cpts_ptp_adjfreq(struct ptp_clock_info *ptp, s32 ppb)
	133	{
	134	u64 adj;
	135	u32 diff, mult;
	136	int neg_adj = 0;
	137	unsigned long flags;
	138	struct cpts *cpts = container_of(ptp, struct cpts, info);
	139
	140	if (ppb < 0) {
	141	neg_adj = 1;
	142	ppb = -ppb;
	143	}
	144	mult = cpts->cc_mult;
	145	adj = mult;
	146	adj *= ppb;
	147	diff = div_u64(adj, 1000000000ULL);
	148
	149	spin_lock_irqsave(&cpts->lock, flags);
	150
	151	timecounter_read(&cpts->tc);
	152
	153	cpts->cc.mult = neg_adj ? mult - diff : mult + diff;
	154
	155	spin_unlock_irqrestore(&cpts->lock, flags);
	156
	157	return 0;
	158	}
	159
	160	static int cpts_ptp_adjtime(struct ptp_clock_info *ptp, s64 delta)
	161	{
162	s64 now;
163	unsigned long flags;
164	struct cpts *cpts = container_of(ptp, struct cpts, info);
165
166	spin_lock_irqsave(&cpts->lock, flags);
167	now = timecounter_read(&cpts->tc);
168	now += delta;
169	timecounter_init(&cpts->tc, &cpts->cc, now);
170	spin_unlock_irqrestore(&cpts->lock, flags);
171
172	return 0;
173	}
174
175	static int cpts_ptp_gettime(struct ptp_clock_info ptp, struct timespec ts)
176	{
177	u64 ns;
178	u32 remainder;
179	unsigned long flags;
180	struct cpts *cpts = container_of(ptp, struct cpts, info);
181
182	spin_lock_irqsave(&cpts->lock, flags);
183	ns = timecounter_read(&cpts->tc);
184	spin_unlock_irqrestore(&cpts->lock, flags);
185
186	ts->tv_sec = div_u64_rem(ns, 1000000000, &remainder);
187	ts->tv_nsec = remainder;
188
189	return 0;
190	}
191
192	static int cpts_ptp_settime(struct ptp_clock_info *ptp,
193	const struct timespec *ts)
194	{
195	u64 ns;
196	unsigned long flags;
197	struct cpts *cpts = container_of(ptp, struct cpts, info);
198
199	ns = ts->tv_sec * 1000000000ULL;
200	ns += ts->tv_nsec;
201
202	spin_lock_irqsave(&cpts->lock, flags);
203	timecounter_init(&cpts->tc, &cpts->cc, ns);
204	spin_unlock_irqrestore(&cpts->lock, flags);
205
206	return 0;
207	}
208
209	static int cpts_ptp_enable(struct ptp_clock_info *ptp,
210	struct ptp_clock_request *rq, int on)
211	{
212	return -EOPNOTSUPP;
213	}
214
215	static struct ptp_clock_info cpts_info = {
216	.owner = THIS_MODULE,
217	.name = "CTPS timer",
218	.max_adj = 1000000,
219	.n_ext_ts = 0,
4986b4f0	220	.n_pins = 0,
87c0e764 RC	221	.pps = 0,
	222	.adjfreq = cpts_ptp_adjfreq,
	223	.adjtime = cpts_ptp_adjtime,
	224	.gettime = cpts_ptp_gettime,
	225	.settime = cpts_ptp_settime,
	226	.enable = cpts_ptp_enable,
	227	};
	228
	229	static void cpts_overflow_check(struct work_struct *work)
	230	{
	231	struct timespec ts;
	232	struct cpts *cpts = container_of(work, struct cpts, overflow_work.work);
	233
	234	cpts_write32(cpts, CPTS_EN, control);
	235	cpts_write32(cpts, TS_PEND_EN, int_enable);
	236	cpts_ptp_gettime(&cpts->info, &ts);
	237	pr_debug("cpts overflow check at %ld.%09lu\n", ts.tv_sec, ts.tv_nsec);
	238	schedule_delayed_work(&cpts->overflow_work, CPTS_OVERFLOW_PERIOD);
	239	}
	240
	241	#define CPTS_REF_CLOCK_NAME "cpsw_cpts_rft_clk"
	242
	243	static void cpts_clk_init(struct cpts *cpts)
	244	{
	245	cpts->refclk = clk_get(NULL, CPTS_REF_CLOCK_NAME);
	246	if (IS_ERR(cpts->refclk)) {
	247	pr_err("Failed to clk_get %s\n", CPTS_REF_CLOCK_NAME);
	248	cpts->refclk = NULL;
	249	return;
	250	}
ccb6e984	251	clk_prepare_enable(cpts->refclk);
87c0e764 RC	252	}
	253
	254	static void cpts_clk_release(struct cpts *cpts)
	255	{
	256	clk_disable(cpts->refclk);
	257	clk_put(cpts->refclk);
	258	}
	259
	260	static int cpts_match(struct sk_buff *skb, unsigned int ptp_class,
	261	u16 ts_seqid, u8 ts_msgtype)
	262	{
	263	u16 *seqid;
	264	unsigned int offset;
	265	u8 msgtype, data = skb->data;
	266
	267	switch (ptp_class) {
	268	case PTP_CLASS_V1_IPV4:
	269	case PTP_CLASS_V2_IPV4:
	270	offset = ETH_HLEN + IPV4_HLEN(data) + UDP_HLEN;
	271	break;
	272	case PTP_CLASS_V1_IPV6:
	273	case PTP_CLASS_V2_IPV6:
	274	offset = OFF_PTP6;
	275	break;
	276	case PTP_CLASS_V2_L2:
	277	offset = ETH_HLEN;
	278	break;
	279	case PTP_CLASS_V2_VLAN:
	280	offset = ETH_HLEN + VLAN_HLEN;
	281	break;
	282	default:
	283	return 0;
	284	}
	285
	286	if (skb->len + ETH_HLEN < offset + OFF_PTP_SEQUENCE_ID + sizeof(*seqid))
	287	return 0;
	288
	289	if (unlikely(ptp_class & PTP_CLASS_V1))
	290	msgtype = data + offset + OFF_PTP_CONTROL;
	291	else
	292	msgtype = data + offset;
	293
	294	seqid = (u16 *)(data + offset + OFF_PTP_SEQUENCE_ID);
	295
	296	return (ts_msgtype == (msgtype & 0xf) && ts_seqid == ntohs(seqid));
	297	}
	298
	299	static u64 cpts_find_ts(struct cpts cpts, struct sk_buff skb, int ev_type)
	300	{
	301	u64 ns = 0;
	302	struct cpts_event *event;
	303	struct list_head this, next;
	304	unsigned int class = sk_run_filter(skb, ptp_filter);
	305	unsigned long flags;
	306	u16 seqid;
	307	u8 mtype;
	308
	309	if (class == PTP_CLASS_NONE)
	310	return 0;
	311
	312	spin_lock_irqsave(&cpts->lock, flags);
	313	cpts_fifo_read(cpts, CPTS_EV_PUSH);
	314	list_for_each_safe(this, next, &cpts->events) {
	315	event = list_entry(this, struct cpts_event, list);
316	if (event_expired(event)) {
317	list_del_init(&event->list);
318	list_add(&event->list, &cpts->pool);
319	continue;
320	}
321	mtype = (event->high >> MESSAGE_TYPE_SHIFT) & MESSAGE_TYPE_MASK;
322	seqid = (event->high >> SEQUENCE_ID_SHIFT) & SEQUENCE_ID_MASK;
323	if (ev_type == event_type(event) &&
324	cpts_match(skb, class, seqid, mtype)) {
325	ns = timecounter_cyc2time(&cpts->tc, event->low);
326	list_del_init(&event->list);
327	list_add(&event->list, &cpts->pool);
328	break;
329	}
330	}
331	spin_unlock_irqrestore(&cpts->lock, flags);
332
333	return ns;
334	}
335
336	void cpts_rx_timestamp(struct cpts cpts, struct sk_buff skb)
337	{
338	u64 ns;
339	struct skb_shared_hwtstamps *ssh;
340
341	if (!cpts->rx_enable)
342	return;
343	ns = cpts_find_ts(cpts, skb, CPTS_EV_RX);
344	if (!ns)
345	return;
346	ssh = skb_hwtstamps(skb);
347	memset(ssh, 0, sizeof(*ssh));
348	ssh->hwtstamp = ns_to_ktime(ns);
349	}
350
351	void cpts_tx_timestamp(struct cpts cpts, struct sk_buff skb)
352	{
353	u64 ns;
354	struct skb_shared_hwtstamps ssh;
355
356	if (!(skb_shinfo(skb)->tx_flags & SKBTX_IN_PROGRESS))
357	return;
358	ns = cpts_find_ts(cpts, skb, CPTS_EV_TX);
359	if (!ns)
360	return;
361	memset(&ssh, 0, sizeof(ssh));
362	ssh.hwtstamp = ns_to_ktime(ns);
363	skb_tstamp_tx(skb, &ssh);
364	}
365
366	#endif /CONFIG_TI_CPTS/
367
368	int cpts_register(struct device dev, struct cpts cpts,
369	u32 mult, u32 shift)
370	{
371	#ifdef CONFIG_TI_CPTS
372	int err, i;
373	unsigned long flags;
374
375	if (ptp_filter_init(ptp_filter, ARRAY_SIZE(ptp_filter))) {
376	pr_err("cpts: bad ptp filter\n");
377	return -EINVAL;
378	}
379	cpts->info = cpts_info;
380	cpts->clock = ptp_clock_register(&cpts->info, dev);
381	if (IS_ERR(cpts->clock)) {
382	err = PTR_ERR(cpts->clock);
383	cpts->clock = NULL;
384	return err;
385	}
386	spin_lock_init(&cpts->lock);
387
388	cpts->cc.read = cpts_systim_read;
389	cpts->cc.mask = CLOCKSOURCE_MASK(32);
390	cpts->cc_mult = mult;
391	cpts->cc.mult = mult;
392	cpts->cc.shift = shift;
393
394	INIT_LIST_HEAD(&cpts->events);
395	INIT_LIST_HEAD(&cpts->pool);
396	for (i = 0; i < CPTS_MAX_EVENTS; i++)
397	list_add(&cpts->pool_data[i].list, &cpts->pool);
398
399	cpts_clk_init(cpts);
400	cpts_write32(cpts, CPTS_EN, control);
401	cpts_write32(cpts, TS_PEND_EN, int_enable);
402
403	spin_lock_irqsave(&cpts->lock, flags);
404	timecounter_init(&cpts->tc, &cpts->cc, ktime_to_ns(ktime_get_real()));
405	spin_unlock_irqrestore(&cpts->lock, flags);
406
407	INIT_DELAYED_WORK(&cpts->overflow_work, cpts_overflow_check);
408	schedule_delayed_work(&cpts->overflow_work, CPTS_OVERFLOW_PERIOD);
409
410	cpts->phc_index = ptp_clock_index(cpts->clock);
411	#endif
412	return 0;
413	}
414
415	void cpts_unregister(struct cpts *cpts)
416	{
417	#ifdef CONFIG_TI_CPTS
418	if (cpts->clock) {
419	ptp_clock_unregister(cpts->clock);
420	cancel_delayed_work_sync(&cpts->overflow_work);
421	}
422	if (cpts->refclk)
423	cpts_clk_release(cpts);
424	#endif
425	}