[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)
{
	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 = 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(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	{
160	s64 now;
161	unsigned long flags;
162	struct cpts *cpts = container_of(ptp, struct cpts, info);
163
164	spin_lock_irqsave(&cpts->lock, flags);
165	now = timecounter_read(&cpts->tc);
166	now += delta;
167	timecounter_init(&cpts->tc, &cpts->cc, now);
168	spin_unlock_irqrestore(&cpts->lock, flags);
169
170	return 0;
171	}
172
173	static int cpts_ptp_gettime(struct ptp_clock_info ptp, struct timespec ts)
174	{
175	u64 ns;
176	u32 remainder;
177	unsigned long flags;
178	struct cpts *cpts = container_of(ptp, struct cpts, info);
179
180	spin_lock_irqsave(&cpts->lock, flags);
181	ns = timecounter_read(&cpts->tc);
182	spin_unlock_irqrestore(&cpts->lock, flags);
183
184	ts->tv_sec = div_u64_rem(ns, 1000000000, &remainder);
185	ts->tv_nsec = remainder;
186
187	return 0;
188	}
189
190	static int cpts_ptp_settime(struct ptp_clock_info *ptp,
191	const struct timespec *ts)
192	{
193	u64 ns;
194	unsigned long flags;
195	struct cpts *cpts = container_of(ptp, struct cpts, info);
196
197	ns = ts->tv_sec * 1000000000ULL;
198	ns += ts->tv_nsec;
199
200	spin_lock_irqsave(&cpts->lock, flags);
201	timecounter_init(&cpts->tc, &cpts->cc, ns);
202	spin_unlock_irqrestore(&cpts->lock, flags);
203
204	return 0;
205	}
206
207	static int cpts_ptp_enable(struct ptp_clock_info *ptp,
208	struct ptp_clock_request *rq, int on)
209	{
210	return -EOPNOTSUPP;
211	}
212
213	static struct ptp_clock_info cpts_info = {
214	.owner = THIS_MODULE,
215	.name = "CTPS timer",
216	.max_adj = 1000000,
217	.n_ext_ts = 0,
4986b4f0	218	.n_pins = 0,
87c0e764 RC	219	.pps = 0,
	220	.adjfreq = cpts_ptp_adjfreq,
	221	.adjtime = cpts_ptp_adjtime,
	222	.gettime = cpts_ptp_gettime,
	223	.settime = cpts_ptp_settime,
	224	.enable = cpts_ptp_enable,
	225	};
	226
	227	static void cpts_overflow_check(struct work_struct *work)
	228	{
	229	struct timespec ts;
	230	struct cpts *cpts = container_of(work, struct cpts, overflow_work.work);
	231
	232	cpts_write32(cpts, CPTS_EN, control);
	233	cpts_write32(cpts, TS_PEND_EN, int_enable);
	234	cpts_ptp_gettime(&cpts->info, &ts);
	235	pr_debug("cpts overflow check at %ld.%09lu\n", ts.tv_sec, ts.tv_nsec);
	236	schedule_delayed_work(&cpts->overflow_work, CPTS_OVERFLOW_PERIOD);
	237	}
	238
	239	#define CPTS_REF_CLOCK_NAME "cpsw_cpts_rft_clk"
	240
	241	static void cpts_clk_init(struct cpts *cpts)
	242	{
	243	cpts->refclk = clk_get(NULL, CPTS_REF_CLOCK_NAME);
	244	if (IS_ERR(cpts->refclk)) {
	245	pr_err("Failed to clk_get %s\n", CPTS_REF_CLOCK_NAME);
	246	cpts->refclk = NULL;
	247	return;
	248	}
ccb6e984	249	clk_prepare_enable(cpts->refclk);
87c0e764 RC	250	}
	251
	252	static void cpts_clk_release(struct cpts *cpts)
	253	{
	254	clk_disable(cpts->refclk);
	255	clk_put(cpts->refclk);
	256	}
	257
	258	static int cpts_match(struct sk_buff *skb, unsigned int ptp_class,
	259	u16 ts_seqid, u8 ts_msgtype)
	260	{
	261	u16 *seqid;
	262	unsigned int offset;
	263	u8 msgtype, data = skb->data;
	264
	265	switch (ptp_class) {
	266	case PTP_CLASS_V1_IPV4:
	267	case PTP_CLASS_V2_IPV4:
	268	offset = ETH_HLEN + IPV4_HLEN(data) + UDP_HLEN;
	269	break;
	270	case PTP_CLASS_V1_IPV6:
	271	case PTP_CLASS_V2_IPV6:
	272	offset = OFF_PTP6;
	273	break;
	274	case PTP_CLASS_V2_L2:
	275	offset = ETH_HLEN;
	276	break;
	277	case PTP_CLASS_V2_VLAN:
	278	offset = ETH_HLEN + VLAN_HLEN;
	279	break;
	280	default:
	281	return 0;
	282	}
	283
	284	if (skb->len + ETH_HLEN < offset + OFF_PTP_SEQUENCE_ID + sizeof(*seqid))
	285	return 0;
	286
	287	if (unlikely(ptp_class & PTP_CLASS_V1))
	288	msgtype = data + offset + OFF_PTP_CONTROL;
	289	else
	290	msgtype = data + offset;
	291
	292	seqid = (u16 *)(data + offset + OFF_PTP_SEQUENCE_ID);
	293
	294	return (ts_msgtype == (msgtype & 0xf) && ts_seqid == ntohs(seqid));
	295	}
	296
	297	static u64 cpts_find_ts(struct cpts cpts, struct sk_buff skb, int ev_type)
	298	{
	299	u64 ns = 0;
	300	struct cpts_event *event;
	301	struct list_head this, next;
164d8c66	302	unsigned int class = ptp_classify_raw(skb);
87c0e764 RC	303	unsigned long flags;
	304	u16 seqid;
	305	u8 mtype;
	306
	307	if (class == PTP_CLASS_NONE)
	308	return 0;
	309
	310	spin_lock_irqsave(&cpts->lock, flags);
	311	cpts_fifo_read(cpts, CPTS_EV_PUSH);
	312	list_for_each_safe(this, next, &cpts->events) {
	313	event = list_entry(this, struct cpts_event, list);
	314	if (event_expired(event)) {
	315	list_del_init(&event->list);
	316	list_add(&event->list, &cpts->pool);
	317	continue;
	318	}
	319	mtype = (event->high >> MESSAGE_TYPE_SHIFT) & MESSAGE_TYPE_MASK;
	320	seqid = (event->high >> SEQUENCE_ID_SHIFT) & SEQUENCE_ID_MASK;
	321	if (ev_type == event_type(event) &&
	322	cpts_match(skb, class, seqid, mtype)) {
	323	ns = timecounter_cyc2time(&cpts->tc, event->low);
	324	list_del_init(&event->list);
	325	list_add(&event->list, &cpts->pool);
	326	break;
	327	}
	328	}
	329	spin_unlock_irqrestore(&cpts->lock, flags);
	330
	331	return ns;
	332	}
	333
	334	void cpts_rx_timestamp(struct cpts cpts, struct sk_buff skb)
	335	{
	336	u64 ns;
	337	struct skb_shared_hwtstamps *ssh;
	338
	339	if (!cpts->rx_enable)
	340	return;
	341	ns = cpts_find_ts(cpts, skb, CPTS_EV_RX);
	342	if (!ns)
	343	return;
	344	ssh = skb_hwtstamps(skb);
	345	memset(ssh, 0, sizeof(*ssh));
	346	ssh->hwtstamp = ns_to_ktime(ns);
	347	}
	348
	349	void cpts_tx_timestamp(struct cpts cpts, struct sk_buff skb)
	350	{
	351	u64 ns;
	352	struct skb_shared_hwtstamps ssh;
	353
	354	if (!(skb_shinfo(skb)->tx_flags & SKBTX_IN_PROGRESS))
	355	return;
	356	ns = cpts_find_ts(cpts, skb, CPTS_EV_TX);
	357	if (!ns)
	358	return;
	359	memset(&ssh, 0, sizeof(ssh));
	360	ssh.hwtstamp = ns_to_ktime(ns);
	361	skb_tstamp_tx(skb, &ssh);
	362	}
	363
	364	#endif /CONFIG_TI_CPTS/
	365
	366	int cpts_register(struct device dev, struct cpts cpts,
367	u32 mult, u32 shift)
368	{
369	#ifdef CONFIG_TI_CPTS
370	int err, i;
371	unsigned long flags;
372
87c0e764 RC	373	cpts->info = cpts_info;
	374	cpts->clock = ptp_clock_register(&cpts->info, dev);
	375	if (IS_ERR(cpts->clock)) {
	376	err = PTR_ERR(cpts->clock);
	377	cpts->clock = NULL;
	378	return err;
	379	}
	380	spin_lock_init(&cpts->lock);
	381
	382	cpts->cc.read = cpts_systim_read;
	383	cpts->cc.mask = CLOCKSOURCE_MASK(32);
	384	cpts->cc_mult = mult;
	385	cpts->cc.mult = mult;
	386	cpts->cc.shift = shift;
	387
	388	INIT_LIST_HEAD(&cpts->events);
	389	INIT_LIST_HEAD(&cpts->pool);
	390	for (i = 0; i < CPTS_MAX_EVENTS; i++)
	391	list_add(&cpts->pool_data[i].list, &cpts->pool);
	392
	393	cpts_clk_init(cpts);
	394	cpts_write32(cpts, CPTS_EN, control);
	395	cpts_write32(cpts, TS_PEND_EN, int_enable);
	396
	397	spin_lock_irqsave(&cpts->lock, flags);
	398	timecounter_init(&cpts->tc, &cpts->cc, ktime_to_ns(ktime_get_real()));
	399	spin_unlock_irqrestore(&cpts->lock, flags);
	400
	401	INIT_DELAYED_WORK(&cpts->overflow_work, cpts_overflow_check);
	402	schedule_delayed_work(&cpts->overflow_work, CPTS_OVERFLOW_PERIOD);
	403
	404	cpts->phc_index = ptp_clock_index(cpts->clock);
	405	#endif
	406	return 0;
	407	}
	408
	409	void cpts_unregister(struct cpts *cpts)
	410	{
	411	#ifdef CONFIG_TI_CPTS
	412	if (cpts->clock) {
	413	ptp_clock_unregister(cpts->clock);
	414	cancel_delayed_work_sync(&cpts->overflow_work);
	415	}
	416	if (cpts->refclk)
	417	cpts_clk_release(cpts);
	418	#endif
	419	}