netdev - Re: [PATCH 4/4] FEC: Add time stamping code and a PTP hardware clock

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Message-ID: <CAHrpEqTVuSR_-Tpdzb98=VJbg7grSFvSQ9xA6mPsHpGb7RvNCg@mail.gmail.com>
Date:	Mon, 17 Dec 2012 22:48:31 +0800
From:	Frank Li <lznuaa@...il.com>
To:	Sascha Hauer <s.hauer@...gutronix.de>
Cc:	Frank Li <Frank.Li@...escale.com>, lznua@...il.com,
	richardcochran@...il.com, shawn.guo@...aro.org,
	linux-arm-kernel@...ts.infradead.org, netdev@...r.kernel.org,
	davem@...emloft.net
Subject: Re: [PATCH 4/4] FEC: Add time stamping code and a PTP hardware clock

2012/12/17 Sascha Hauer <s.hauer@...gutronix.de>:
> On Wed, Oct 31, 2012 at 12:25:31PM +0800, Frank Li wrote:
>> This patch adds a driver for the FEC(MX6) that offers time
>> stamping and a PTP haderware clock. Because FEC\ENET(MX6)
>> hardware frequency adjustment is complex, we have implemented
>> this in software by changing the multiplication factor of the
>> timecounter.
>>
>> Signed-off-by: Frank Li <Frank.Li@...escale.com>
>> ---
>>  drivers/net/ethernet/freescale/Kconfig   |    9 +
>>  drivers/net/ethernet/freescale/Makefile  |    1 +
>>  drivers/net/ethernet/freescale/fec.c     |   88 +++++++-
>>  drivers/net/ethernet/freescale/fec.h     |   38 +++
>>  drivers/net/ethernet/freescale/fec_ptp.c |  386 ++++++++++++++++++++++++++++++
>>  5 files changed, 521 insertions(+), 1 deletions(-)
>>  create mode 100644 drivers/net/ethernet/freescale/fec_ptp.c
>>
>> diff --git a/drivers/net/ethernet/freescale/Kconfig b/drivers/net/ethernet/freescale/Kconfig
>> index feff516..ff3be53 100644
>> --- a/drivers/net/ethernet/freescale/Kconfig
>> +++ b/drivers/net/ethernet/freescale/Kconfig
>> @@ -92,4 +92,13 @@ config GIANFAR
>>         This driver supports the Gigabit TSEC on the MPC83xx, MPC85xx,
>>         and MPC86xx family of chips, and the FEC on the 8540.
>>
>> +config FEC_PTP
>> +     bool "PTP Hardware Clock (PHC)"
>> +     depends on FEC
>> +     select PPS
>> +     select PTP_1588_CLOCK
>> +     --help---
>> +       Say Y here if you want to use PTP Hardware Clock (PHC) in the
>> +       driver.  Only the basic clock operations have been implemented.
>> +
>>  endif # NET_VENDOR_FREESCALE
>> diff --git a/drivers/net/ethernet/freescale/Makefile b/drivers/net/ethernet/freescale/Makefile
>> index 3d1839a..d4d19b3 100644
>> --- a/drivers/net/ethernet/freescale/Makefile
>> +++ b/drivers/net/ethernet/freescale/Makefile
>> @@ -3,6 +3,7 @@
>>  #
>>
>>  obj-$(CONFIG_FEC) += fec.o
>> +obj-$(CONFIG_FEC_PTP) += fec_ptp.o
>>  obj-$(CONFIG_FEC_MPC52xx) += fec_mpc52xx.o
>>  ifeq ($(CONFIG_FEC_MPC52xx_MDIO),y)
>>       obj-$(CONFIG_FEC_MPC52xx) += fec_mpc52xx_phy.o
>> diff --git a/drivers/net/ethernet/freescale/fec.c b/drivers/net/ethernet/freescale/fec.c
>> index d0e1b33..2665162 100644
>> --- a/drivers/net/ethernet/freescale/fec.c
>> +++ b/drivers/net/ethernet/freescale/fec.c
>> @@ -280,6 +280,17 @@ fec_enet_start_xmit(struct sk_buff *skb, struct net_device *ndev)
>>                       | BD_ENET_TX_LAST | BD_ENET_TX_TC);
>>       bdp->cbd_sc = status;
>>
>> +#ifdef CONFIG_FEC_PTP
>
> This ifdef desert in the fec driver currently breaks all SoCs except
> i.MX6 in the imx_v6_v7_defconfig.
>
> Most of these could be fixed with something like if (fec_use_ptp(fep)),
>
>
>>  #if defined(CONFIG_M523x) || defined(CONFIG_M527x) || defined(CONFIG_M528x) || \
>>      defined(CONFIG_M520x) || defined(CONFIG_M532x) || \
>>      defined(CONFIG_ARCH_MXC) || defined(CONFIG_SOC_IMX28)
>> @@ -88,6 +94,13 @@ struct bufdesc {
>>       unsigned short cbd_datlen;      /* Data length */
>>       unsigned short cbd_sc;  /* Control and status info */
>>       unsigned long cbd_bufaddr;      /* Buffer address */
>> +#ifdef CONFIG_FEC_PTP
>> +     unsigned long cbd_esc;
>> +     unsigned long cbd_prot;
>> +     unsigned long cbd_bdu;
>> +     unsigned long ts;
>> +     unsigned short res0[4];
>> +#endif
>>  };
>
> This one changes the layout of the hardware buffer description which is
> not so easy to fix.

Yes, it is not easy to fix if dynamic check mx6 or other devices.

>
> I don't know how to continue from here. Since the whole patch doesn't
> seem to reviewed very much I tend to say we should revert it for now and
> let Frank redo it for the next merge window.
>
> Other opinions?

Can we just disable CONFIG_FEC_PTP defaut instead of revert whole patch?

>
> Sascha
>
> --
> Pengutronix e.K.                           |                             |
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