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Date:   Thu, 26 Dec 2019 11:22:47 +0000
From:   "Y.b. Lu" <yangbo.lu@....com>
To:     Andrew Lunn <andrew@...n.ch>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "David S . Miller" <davem@...emloft.net>,
        Claudiu Manoil <claudiu.manoil@....com>,
        Vladimir Oltean <vladimir.oltean@....com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Microchip Linux Driver Support <UNGLinuxDriver@...rochip.com>,
        Richard Cochran <richardcochran@...il.com>
Subject: RE: [PATCH] net: mscc: ocelot: support PPS signal generation

> -----Original Message-----
> From: Andrew Lunn <andrew@...n.ch>
> Sent: Thursday, December 26, 2019 6:59 PM
> To: Y.b. Lu <yangbo.lu@....com>
> Cc: netdev@...r.kernel.org; David S . Miller <davem@...emloft.net>;
> Claudiu Manoil <claudiu.manoil@....com>; Vladimir Oltean
> <vladimir.oltean@....com>; Alexandre Belloni
> <alexandre.belloni@...tlin.com>; Microchip Linux Driver Support
> <UNGLinuxDriver@...rochip.com>; Richard Cochran
> <richardcochran@...il.com>
> Subject: Re: [PATCH] net: mscc: ocelot: support PPS signal generation
> 
> On Thu, Dec 26, 2019 at 05:58:51PM +0800, Yangbo Lu wrote:
> > This patch is to support PPS signal generation for Ocelot family
> > switches, including VSC9959 switch.
> 
> Hi Yangbo
> 
> Please always Cc: Richard Cochran <richardcochran@...il.com> for ptp
> patches.
> 

Sorry for missing...

> 	Andrew
> 
> >
> > Signed-off-by: Yangbo Lu <yangbo.lu@....com>
> > ---
> >  drivers/net/dsa/ocelot/felix_vsc9959.c  |  2 ++
> >  drivers/net/ethernet/mscc/ocelot.c      | 25
> +++++++++++++++++++++++++
> >  drivers/net/ethernet/mscc/ocelot_ptp.h  |  2 ++
> >  drivers/net/ethernet/mscc/ocelot_regs.c |  2 ++
> >  include/soc/mscc/ocelot.h               |  2 ++
> >  5 files changed, 33 insertions(+)
> >
> > diff --git a/drivers/net/dsa/ocelot/felix_vsc9959.c
> b/drivers/net/dsa/ocelot/felix_vsc9959.c
> > index b9758b0..ee0ce7c 100644
> > --- a/drivers/net/dsa/ocelot/felix_vsc9959.c
> > +++ b/drivers/net/dsa/ocelot/felix_vsc9959.c
> > @@ -287,6 +287,8 @@ static const u32 vsc9959_ptp_regmap[] = {
> >  	REG(PTP_PIN_TOD_SEC_MSB,           0x000004),
> >  	REG(PTP_PIN_TOD_SEC_LSB,           0x000008),
> >  	REG(PTP_PIN_TOD_NSEC,              0x00000c),
> > +	REG(PTP_PIN_WF_HIGH_PERIOD,        0x000014),
> > +	REG(PTP_PIN_WF_LOW_PERIOD,         0x000018),
> >  	REG(PTP_CFG_MISC,                  0x0000a0),
> >  	REG(PTP_CLK_CFG_ADJ_CFG,           0x0000a4),
> >  	REG(PTP_CLK_CFG_ADJ_FREQ,          0x0000a8),
> > diff --git a/drivers/net/ethernet/mscc/ocelot.c
> b/drivers/net/ethernet/mscc/ocelot.c
> > index 985b46d..c0f8a9e 100644
> > --- a/drivers/net/ethernet/mscc/ocelot.c
> > +++ b/drivers/net/ethernet/mscc/ocelot.c
> > @@ -2147,6 +2147,29 @@ static struct ptp_clock_info
> ocelot_ptp_clock_info = {
> >  	.adjfine	= ocelot_ptp_adjfine,
> >  };
> >
> > +static void ocelot_ptp_init_pps(struct ocelot *ocelot)
> > +{
> > +	u32 val;
> > +
> > +	/* PPS signal generation uses CLOCK action. Together with SYNC option,
> > +	 * a single pulse will be generated after <WAFEFORM_LOW>
> nanoseconds
> > +	 * after the time of day has increased the seconds. The pulse will
> > +	 * get a width of <WAFEFORM_HIGH> nanoseconds.
> > +	 *
> > +	 * In default,
> > +	 * WAFEFORM_LOW = 0
> > +	 * WAFEFORM_HIGH = 1us
> > +	 */
> > +	ocelot_write_rix(ocelot, 0, PTP_PIN_WF_LOW_PERIOD, ALT_PPS_PIN);
> > +	ocelot_write_rix(ocelot, 1000, PTP_PIN_WF_HIGH_PERIOD,
> ALT_PPS_PIN);
> > +
> > +	val = ocelot_read_rix(ocelot, PTP_PIN_CFG, ALT_PPS_PIN);
> > +	val &= ~(PTP_PIN_CFG_SYNC | PTP_PIN_CFG_ACTION_MASK |
> PTP_PIN_CFG_DOM);
> > +	val |= (PTP_PIN_CFG_SYNC |
> PTP_PIN_CFG_ACTION(PTP_PIN_ACTION_CLOCK));
> > +
> > +	ocelot_write_rix(ocelot, val, PTP_PIN_CFG, ALT_PPS_PIN);
> > +}
> > +
> >  static int ocelot_init_timestamp(struct ocelot *ocelot)
> >  {
> >  	struct ptp_clock *ptp_clock;
> > @@ -2478,6 +2501,8 @@ int ocelot_init(struct ocelot *ocelot)
> >  				"Timestamp initialization failed\n");
> >  			return ret;
> >  		}
> > +
> > +		ocelot_ptp_init_pps(ocelot);
> >  	}
> >
> >  	return 0;
> > diff --git a/drivers/net/ethernet/mscc/ocelot_ptp.h
> b/drivers/net/ethernet/mscc/ocelot_ptp.h
> > index 9ede14a..21bc744 100644
> > --- a/drivers/net/ethernet/mscc/ocelot_ptp.h
> > +++ b/drivers/net/ethernet/mscc/ocelot_ptp.h
> > @@ -13,6 +13,8 @@
> >  #define PTP_PIN_TOD_SEC_MSB_RSZ		PTP_PIN_CFG_RSZ
> >  #define PTP_PIN_TOD_SEC_LSB_RSZ		PTP_PIN_CFG_RSZ
> >  #define PTP_PIN_TOD_NSEC_RSZ		PTP_PIN_CFG_RSZ
> > +#define PTP_PIN_WF_HIGH_PERIOD_RSZ	PTP_PIN_CFG_RSZ
> > +#define PTP_PIN_WF_LOW_PERIOD_RSZ	PTP_PIN_CFG_RSZ
> >
> >  #define PTP_PIN_CFG_DOM			BIT(0)
> >  #define PTP_PIN_CFG_SYNC		BIT(2)
> > diff --git a/drivers/net/ethernet/mscc/ocelot_regs.c
> b/drivers/net/ethernet/mscc/ocelot_regs.c
> > index b88b589..ed4dd01 100644
> > --- a/drivers/net/ethernet/mscc/ocelot_regs.c
> > +++ b/drivers/net/ethernet/mscc/ocelot_regs.c
> > @@ -239,6 +239,8 @@ static const u32 ocelot_ptp_regmap[] = {
> >  	REG(PTP_PIN_TOD_SEC_MSB,           0x000004),
> >  	REG(PTP_PIN_TOD_SEC_LSB,           0x000008),
> >  	REG(PTP_PIN_TOD_NSEC,              0x00000c),
> > +	REG(PTP_PIN_WF_HIGH_PERIOD,        0x000014),
> > +	REG(PTP_PIN_WF_LOW_PERIOD,         0x000018),
> >  	REG(PTP_CFG_MISC,                  0x0000a0),
> >  	REG(PTP_CLK_CFG_ADJ_CFG,           0x0000a4),
> >  	REG(PTP_CLK_CFG_ADJ_FREQ,          0x0000a8),
> > diff --git a/include/soc/mscc/ocelot.h b/include/soc/mscc/ocelot.h
> > index 64cbbbe..c2ab20d 100644
> > --- a/include/soc/mscc/ocelot.h
> > +++ b/include/soc/mscc/ocelot.h
> > @@ -325,6 +325,8 @@ enum ocelot_reg {
> >  	PTP_PIN_TOD_SEC_MSB,
> >  	PTP_PIN_TOD_SEC_LSB,
> >  	PTP_PIN_TOD_NSEC,
> > +	PTP_PIN_WF_HIGH_PERIOD,
> > +	PTP_PIN_WF_LOW_PERIOD,
> >  	PTP_CFG_MISC,
> >  	PTP_CLK_CFG_ADJ_CFG,
> >  	PTP_CLK_CFG_ADJ_FREQ,
> > --
> > 2.7.4
> >

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