net: dsa: mv88e6xxx: expose switch time as a PTP hardware clock
This patch adds basic support for exposing the 32-bit timestamp counter inside the mv88e6xxx switch as a ptp_clock. Adjfine implemented by Richard Cochran. Andrew Lunn: fix return value of PTP stub function. Signed-off-by: Brandon Streiff <brandon.streiff@ni.com> Signed-off-by: Richard Cochran <richardcochran@gmail.com> Signed-off-by: Andrew Lunn <andrew@lunn.ch> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Brandon Streiff
David S. Miller
parent
0d632c3d6f
commit
2fa8d3af4b
|
|
@ -18,3 +18,13 @@ config NET_DSA_MV88E6XXX_GLOBAL2
|
|||
|
||||
It is required on most chips. If the chip you compile the support for
|
||||
doesn't have such registers set, say N here. In doubt, say Y.
|
||||
|
||||
config NET_DSA_MV88E6XXX_PTP
|
||||
bool "PTP support for Marvell 88E6xxx"
|
||||
default n
|
||||
depends on NET_DSA_MV88E6XXX_GLOBAL2
|
||||
imply NETWORK_PHY_TIMESTAMPING
|
||||
imply PTP_1588_CLOCK
|
||||
help
|
||||
Say Y to enable PTP hardware timestamping on Marvell 88E6xxx switch
|
||||
chips that support it.
|
||||
|
|
|
|||
|
|
@ -8,4 +8,5 @@ mv88e6xxx-$(CONFIG_NET_DSA_MV88E6XXX_GLOBAL2) += global2.o
|
|||
mv88e6xxx-$(CONFIG_NET_DSA_MV88E6XXX_GLOBAL2) += global2_avb.o
|
||||
mv88e6xxx-objs += phy.o
|
||||
mv88e6xxx-objs += port.o
|
||||
mv88e6xxx-$(CONFIG_NET_DSA_MV88E6XXX_PTP) += ptp.o
|
||||
mv88e6xxx-objs += serdes.o
|
||||
|
|
|
|||
|
|
@ -38,6 +38,7 @@
|
|||
#include "global2.h"
|
||||
#include "phy.h"
|
||||
#include "port.h"
|
||||
#include "ptp.h"
|
||||
#include "serdes.h"
|
||||
|
||||
static void assert_reg_lock(struct mv88e6xxx_chip *chip)
|
||||
|
|
@ -2092,6 +2093,13 @@ static int mv88e6xxx_setup(struct dsa_switch *ds)
|
|||
if (err)
|
||||
goto unlock;
|
||||
|
||||
/* Setup PTP Hardware Clock */
|
||||
if (chip->info->ptp_support) {
|
||||
err = mv88e6xxx_ptp_setup(chip);
|
||||
if (err)
|
||||
goto unlock;
|
||||
}
|
||||
|
||||
unlock:
|
||||
mutex_unlock(&chip->reg_lock);
|
||||
|
||||
|
|
@ -3484,6 +3492,7 @@ static const struct mv88e6xxx_info mv88e6xxx_table[] = {
|
|||
.pvt = true,
|
||||
.multi_chip = true,
|
||||
.tag_protocol = DSA_TAG_PROTO_DSA,
|
||||
.ptp_support = true,
|
||||
.ops = &mv88e6191_ops,
|
||||
},
|
||||
|
||||
|
|
@ -3504,6 +3513,7 @@ static const struct mv88e6xxx_info mv88e6xxx_table[] = {
|
|||
.pvt = true,
|
||||
.multi_chip = true,
|
||||
.tag_protocol = DSA_TAG_PROTO_EDSA,
|
||||
.ptp_support = true,
|
||||
.ops = &mv88e6240_ops,
|
||||
},
|
||||
|
||||
|
|
@ -3524,6 +3534,7 @@ static const struct mv88e6xxx_info mv88e6xxx_table[] = {
|
|||
.pvt = true,
|
||||
.multi_chip = true,
|
||||
.tag_protocol = DSA_TAG_PROTO_DSA,
|
||||
.ptp_support = true,
|
||||
.ops = &mv88e6290_ops,
|
||||
},
|
||||
|
||||
|
|
@ -3543,6 +3554,7 @@ static const struct mv88e6xxx_info mv88e6xxx_table[] = {
|
|||
.pvt = true,
|
||||
.multi_chip = true,
|
||||
.tag_protocol = DSA_TAG_PROTO_EDSA,
|
||||
.ptp_support = true,
|
||||
.ops = &mv88e6320_ops,
|
||||
},
|
||||
|
||||
|
|
@ -3561,6 +3573,7 @@ static const struct mv88e6xxx_info mv88e6xxx_table[] = {
|
|||
.atu_move_port_mask = 0xf,
|
||||
.multi_chip = true,
|
||||
.tag_protocol = DSA_TAG_PROTO_EDSA,
|
||||
.ptp_support = true,
|
||||
.ops = &mv88e6321_ops,
|
||||
},
|
||||
|
||||
|
|
@ -3580,6 +3593,7 @@ static const struct mv88e6xxx_info mv88e6xxx_table[] = {
|
|||
.pvt = true,
|
||||
.multi_chip = true,
|
||||
.tag_protocol = DSA_TAG_PROTO_EDSA,
|
||||
.ptp_support = true,
|
||||
.ops = &mv88e6341_ops,
|
||||
},
|
||||
|
||||
|
|
@ -3640,6 +3654,7 @@ static const struct mv88e6xxx_info mv88e6xxx_table[] = {
|
|||
.pvt = true,
|
||||
.multi_chip = true,
|
||||
.tag_protocol = DSA_TAG_PROTO_EDSA,
|
||||
.ptp_support = true,
|
||||
.ops = &mv88e6352_ops,
|
||||
},
|
||||
[MV88E6390] = {
|
||||
|
|
@ -3659,6 +3674,7 @@ static const struct mv88e6xxx_info mv88e6xxx_table[] = {
|
|||
.pvt = true,
|
||||
.multi_chip = true,
|
||||
.tag_protocol = DSA_TAG_PROTO_DSA,
|
||||
.ptp_support = true,
|
||||
.ops = &mv88e6390_ops,
|
||||
},
|
||||
[MV88E6390X] = {
|
||||
|
|
@ -3678,6 +3694,7 @@ static const struct mv88e6xxx_info mv88e6xxx_table[] = {
|
|||
.pvt = true,
|
||||
.multi_chip = true,
|
||||
.tag_protocol = DSA_TAG_PROTO_DSA,
|
||||
.ptp_support = true,
|
||||
.ops = &mv88e6390x_ops,
|
||||
},
|
||||
};
|
||||
|
|
@ -4031,6 +4048,9 @@ static void mv88e6xxx_remove(struct mdio_device *mdiodev)
|
|||
struct dsa_switch *ds = dev_get_drvdata(&mdiodev->dev);
|
||||
struct mv88e6xxx_chip *chip = ds->priv;
|
||||
|
||||
if (chip->info->ptp_support)
|
||||
mv88e6xxx_ptp_free(chip);
|
||||
|
||||
mv88e6xxx_phy_destroy(chip);
|
||||
mv88e6xxx_unregister_switch(chip);
|
||||
mv88e6xxx_mdios_unregister(chip);
|
||||
|
|
|
|||
|
|
@ -16,6 +16,8 @@
|
|||
#include <linux/irq.h>
|
||||
#include <linux/gpio/consumer.h>
|
||||
#include <linux/phy.h>
|
||||
#include <linux/ptp_clock_kernel.h>
|
||||
#include <linux/timecounter.h>
|
||||
#include <net/dsa.h>
|
||||
|
||||
#ifndef UINT64_MAX
|
||||
|
|
@ -126,6 +128,9 @@ struct mv88e6xxx_info {
|
|||
*/
|
||||
u8 atu_move_port_mask;
|
||||
const struct mv88e6xxx_ops *ops;
|
||||
|
||||
/* Supports PTP */
|
||||
bool ptp_support;
|
||||
};
|
||||
|
||||
struct mv88e6xxx_atu_entry {
|
||||
|
|
@ -210,6 +215,16 @@ struct mv88e6xxx_chip {
|
|||
int watchdog_irq;
|
||||
int atu_prob_irq;
|
||||
int vtu_prob_irq;
|
||||
|
||||
/* This cyclecounter abstracts the switch PTP time.
|
||||
* reg_lock must be held for any operation that read()s.
|
||||
*/
|
||||
struct cyclecounter tstamp_cc;
|
||||
struct timecounter tstamp_tc;
|
||||
struct delayed_work overflow_work;
|
||||
|
||||
struct ptp_clock *ptp_clock;
|
||||
struct ptp_clock_info ptp_clock_info;
|
||||
};
|
||||
|
||||
struct mv88e6xxx_bus_ops {
|
||||
|
|
|
|||
|
|
@ -0,0 +1,197 @@
|
|||
/*
|
||||
* Marvell 88E6xxx Switch PTP support
|
||||
*
|
||||
* Copyright (c) 2008 Marvell Semiconductor
|
||||
*
|
||||
* Copyright (c) 2017 National Instruments
|
||||
* Erik Hons <erik.hons@ni.com>
|
||||
* Brandon Streiff <brandon.streiff@ni.com>
|
||||
* Dane Wagner <dane.wagner@ni.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.
|
||||
*/
|
||||
|
||||
#include "chip.h"
|
||||
#include "global2.h"
|
||||
#include "ptp.h"
|
||||
|
||||
/* Raw timestamps are in units of 8-ns clock periods. */
|
||||
#define CC_SHIFT 28
|
||||
#define CC_MULT (8 << CC_SHIFT)
|
||||
#define CC_MULT_NUM (1 << 9)
|
||||
#define CC_MULT_DEM 15625ULL
|
||||
|
||||
#define TAI_EVENT_WORK_INTERVAL msecs_to_jiffies(100)
|
||||
|
||||
#define cc_to_chip(cc) container_of(cc, struct mv88e6xxx_chip, tstamp_cc)
|
||||
#define ptp_to_chip(ptp) container_of(ptp, struct mv88e6xxx_chip, \
|
||||
ptp_clock_info)
|
||||
#define dw_overflow_to_chip(dw) container_of(dw, struct mv88e6xxx_chip, \
|
||||
overflow_work)
|
||||
|
||||
static int mv88e6xxx_tai_read(struct mv88e6xxx_chip *chip, int addr,
|
||||
u16 *data, int len)
|
||||
{
|
||||
if (!chip->info->ops->avb_ops->tai_read)
|
||||
return -EOPNOTSUPP;
|
||||
|
||||
return chip->info->ops->avb_ops->tai_read(chip, addr, data, len);
|
||||
}
|
||||
|
||||
static u64 mv88e6xxx_ptp_clock_read(const struct cyclecounter *cc)
|
||||
{
|
||||
struct mv88e6xxx_chip *chip = cc_to_chip(cc);
|
||||
u16 phc_time[2];
|
||||
int err;
|
||||
|
||||
err = mv88e6xxx_tai_read(chip, MV88E6XXX_TAI_TIME_LO, phc_time,
|
||||
ARRAY_SIZE(phc_time));
|
||||
if (err)
|
||||
return 0;
|
||||
else
|
||||
return ((u32)phc_time[1] << 16) | phc_time[0];
|
||||
}
|
||||
|
||||
static int mv88e6xxx_ptp_adjfine(struct ptp_clock_info *ptp, long scaled_ppm)
|
||||
{
|
||||
struct mv88e6xxx_chip *chip = ptp_to_chip(ptp);
|
||||
int neg_adj = 0;
|
||||
u32 diff, mult;
|
||||
u64 adj;
|
||||
|
||||
if (scaled_ppm < 0) {
|
||||
neg_adj = 1;
|
||||
scaled_ppm = -scaled_ppm;
|
||||
}
|
||||
mult = CC_MULT;
|
||||
adj = CC_MULT_NUM;
|
||||
adj *= scaled_ppm;
|
||||
diff = div_u64(adj, CC_MULT_DEM);
|
||||
|
||||
mutex_lock(&chip->reg_lock);
|
||||
|
||||
timecounter_read(&chip->tstamp_tc);
|
||||
chip->tstamp_cc.mult = neg_adj ? mult - diff : mult + diff;
|
||||
|
||||
mutex_unlock(&chip->reg_lock);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int mv88e6xxx_ptp_adjtime(struct ptp_clock_info *ptp, s64 delta)
|
||||
{
|
||||
struct mv88e6xxx_chip *chip = ptp_to_chip(ptp);
|
||||
|
||||
mutex_lock(&chip->reg_lock);
|
||||
timecounter_adjtime(&chip->tstamp_tc, delta);
|
||||
mutex_unlock(&chip->reg_lock);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int mv88e6xxx_ptp_gettime(struct ptp_clock_info *ptp,
|
||||
struct timespec64 *ts)
|
||||
{
|
||||
struct mv88e6xxx_chip *chip = ptp_to_chip(ptp);
|
||||
u64 ns;
|
||||
|
||||
mutex_lock(&chip->reg_lock);
|
||||
ns = timecounter_read(&chip->tstamp_tc);
|
||||
mutex_unlock(&chip->reg_lock);
|
||||
|
||||
*ts = ns_to_timespec64(ns);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int mv88e6xxx_ptp_settime(struct ptp_clock_info *ptp,
|
||||
const struct timespec64 *ts)
|
||||
{
|
||||
struct mv88e6xxx_chip *chip = ptp_to_chip(ptp);
|
||||
u64 ns;
|
||||
|
||||
ns = timespec64_to_ns(ts);
|
||||
|
||||
mutex_lock(&chip->reg_lock);
|
||||
timecounter_init(&chip->tstamp_tc, &chip->tstamp_cc, ns);
|
||||
mutex_unlock(&chip->reg_lock);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int mv88e6xxx_ptp_enable(struct ptp_clock_info *ptp,
|
||||
struct ptp_clock_request *rq, int on)
|
||||
{
|
||||
return -EOPNOTSUPP;
|
||||
}
|
||||
|
||||
static int mv88e6xxx_ptp_verify(struct ptp_clock_info *ptp, unsigned int pin,
|
||||
enum ptp_pin_function func, unsigned int chan)
|
||||
{
|
||||
return -EOPNOTSUPP;
|
||||
}
|
||||
|
||||
/* With a 125MHz input clock, the 32-bit timestamp counter overflows in ~34.3
|
||||
* seconds; this task forces periodic reads so that we don't miss any.
|
||||
*/
|
||||
#define MV88E6XXX_TAI_OVERFLOW_PERIOD (HZ * 16)
|
||||
static void mv88e6xxx_ptp_overflow_check(struct work_struct *work)
|
||||
{
|
||||
struct delayed_work *dw = to_delayed_work(work);
|
||||
struct mv88e6xxx_chip *chip = dw_overflow_to_chip(dw);
|
||||
struct timespec64 ts;
|
||||
|
||||
mv88e6xxx_ptp_gettime(&chip->ptp_clock_info, &ts);
|
||||
|
||||
schedule_delayed_work(&chip->overflow_work,
|
||||
MV88E6XXX_TAI_OVERFLOW_PERIOD);
|
||||
}
|
||||
|
||||
int mv88e6xxx_ptp_setup(struct mv88e6xxx_chip *chip)
|
||||
{
|
||||
/* Set up the cycle counter */
|
||||
memset(&chip->tstamp_cc, 0, sizeof(chip->tstamp_cc));
|
||||
chip->tstamp_cc.read = mv88e6xxx_ptp_clock_read;
|
||||
chip->tstamp_cc.mask = CYCLECOUNTER_MASK(32);
|
||||
chip->tstamp_cc.mult = CC_MULT;
|
||||
chip->tstamp_cc.shift = CC_SHIFT;
|
||||
|
||||
timecounter_init(&chip->tstamp_tc, &chip->tstamp_cc,
|
||||
ktime_to_ns(ktime_get_real()));
|
||||
|
||||
INIT_DELAYED_WORK(&chip->overflow_work, mv88e6xxx_ptp_overflow_check);
|
||||
|
||||
chip->ptp_clock_info.owner = THIS_MODULE;
|
||||
snprintf(chip->ptp_clock_info.name, sizeof(chip->ptp_clock_info.name),
|
||||
dev_name(chip->dev));
|
||||
chip->ptp_clock_info.max_adj = 1000000;
|
||||
|
||||
chip->ptp_clock_info.adjfine = mv88e6xxx_ptp_adjfine;
|
||||
chip->ptp_clock_info.adjtime = mv88e6xxx_ptp_adjtime;
|
||||
chip->ptp_clock_info.gettime64 = mv88e6xxx_ptp_gettime;
|
||||
chip->ptp_clock_info.settime64 = mv88e6xxx_ptp_settime;
|
||||
chip->ptp_clock_info.enable = mv88e6xxx_ptp_enable;
|
||||
chip->ptp_clock_info.verify = mv88e6xxx_ptp_verify;
|
||||
|
||||
chip->ptp_clock = ptp_clock_register(&chip->ptp_clock_info, chip->dev);
|
||||
if (IS_ERR(chip->ptp_clock))
|
||||
return PTR_ERR(chip->ptp_clock);
|
||||
|
||||
schedule_delayed_work(&chip->overflow_work,
|
||||
MV88E6XXX_TAI_OVERFLOW_PERIOD);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
void mv88e6xxx_ptp_free(struct mv88e6xxx_chip *chip)
|
||||
{
|
||||
if (chip->ptp_clock) {
|
||||
cancel_delayed_work_sync(&chip->overflow_work);
|
||||
|
||||
ptp_clock_unregister(chip->ptp_clock);
|
||||
chip->ptp_clock = NULL;
|
||||
}
|
||||
}
|
||||
|
|
@ -0,0 +1,83 @@
|
|||
/*
|
||||
* Marvell 88E6xxx Switch PTP support
|
||||
*
|
||||
* Copyright (c) 2008 Marvell Semiconductor
|
||||
*
|
||||
* Copyright (c) 2017 National Instruments
|
||||
* Erik Hons <erik.hons@ni.com>
|
||||
* Brandon Streiff <brandon.streiff@ni.com>
|
||||
* Dane Wagner <dane.wagner@ni.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.
|
||||
*/
|
||||
|
||||
#ifndef _MV88E6XXX_PTP_H
|
||||
#define _MV88E6XXX_PTP_H
|
||||
|
||||
#include "chip.h"
|
||||
|
||||
/* Offset 0x00: TAI Global Config */
|
||||
#define MV88E6XXX_TAI_CFG 0x00
|
||||
|
||||
/* Offset 0x01: Timestamp Clock Period (ps) */
|
||||
#define MV88E6XXX_TAI_CLOCK_PERIOD 0x01
|
||||
|
||||
/* Offset 0x02/0x03: Trigger Generation Amount */
|
||||
#define MV88E6XXX_TAI_TRIG_GEN_AMOUNT_LO 0x02
|
||||
#define MV88E6XXX_TAI_TRIG_GEN_AMOUNT_HI 0x03
|
||||
|
||||
/* Offset 0x04: Clock Compensation */
|
||||
#define MV88E6XXX_TAI_TRIG_CLOCK_COMP 0x04
|
||||
|
||||
/* Offset 0x05: Trigger Configuration */
|
||||
#define MV88E6XXX_TAI_TRIG_CFG 0x05
|
||||
|
||||
/* Offset 0x06: Ingress Rate Limiter Clock Generation Amount */
|
||||
#define MV88E6XXX_TAI_IRL_AMOUNT 0x06
|
||||
|
||||
/* Offset 0x07: Ingress Rate Limiter Compensation */
|
||||
#define MV88E6XXX_TAI_IRL_COMP 0x07
|
||||
|
||||
/* Offset 0x08: Ingress Rate Limiter Compensation */
|
||||
#define MV88E6XXX_TAI_IRL_COMP_PS 0x08
|
||||
|
||||
/* Offset 0x09: Event Status */
|
||||
#define MV88E6XXX_TAI_EVENT_STATUS 0x09
|
||||
|
||||
/* Offset 0x0A/0x0B: Event Time */
|
||||
#define MV88E6XXX_TAI_EVENT_TIME_LO 0x0a
|
||||
#define MV88E6XXX_TAI_EVENT_TYPE_HI 0x0b
|
||||
|
||||
/* Offset 0x0E/0x0F: PTP Global Time */
|
||||
#define MV88E6XXX_TAI_TIME_LO 0x0e
|
||||
#define MV88E6XXX_TAI_TIME_HI 0x0f
|
||||
|
||||
/* Offset 0x10/0x11: Trig Generation Time */
|
||||
#define MV88E6XXX_TAI_TRIG_TIME_LO 0x10
|
||||
#define MV88E6XXX_TAI_TRIG_TIME_HI 0x11
|
||||
|
||||
/* Offset 0x12: Lock Status */
|
||||
#define MV88E6XXX_TAI_LOCK_STATUS 0x12
|
||||
|
||||
#ifdef CONFIG_NET_DSA_MV88E6XXX_PTP
|
||||
|
||||
int mv88e6xxx_ptp_setup(struct mv88e6xxx_chip *chip);
|
||||
void mv88e6xxx_ptp_free(struct mv88e6xxx_chip *chip);
|
||||
|
||||
#else /* !CONFIG_NET_DSA_MV88E6XXX_PTP */
|
||||
|
||||
static inline int mv88e6xxx_ptp_setup(struct mv88e6xxx_chip *chip)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void mv88e6xxx_ptp_free(struct mv88e6xxx_chip *chip)
|
||||
{
|
||||
}
|
||||
|
||||
#endif /* CONFIG_NET_DSA_MV88E6XXX_PTP */
|
||||
|
||||
#endif /* _MV88E6XXX_PTP_H */
|
||||
Loading…
Reference in New Issue