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net: dsa: mv88e6xxx: add workaround for 6341 timestamping

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88E6341 devices default to timestamping at the PHY, but due to a
hardware issue, timestamps via this component are unreliable. For
this family, configure the PTP hardware to force the timestamping
to occur at the MAC.

Signed-off-by: Brandon Streiff <brandon.streiff@ni.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 2018-02-14 01:07:51 +01:00 committed by David S. Miller
parent c6fe0ad2c3
commit a2e47134e5
2 changed files with 22 additions and 0 deletions
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13
drivers/net/dsa/mv88e6xxx/hwtstamp.c
View File

@ -563,6 +563,19 @@ int mv88e6xxx_hwtstamp_setup(struct mv88e6xxx_chip *chip)
if (err)
return err;
/* 88E6341 devices default to timestamping at the PHY, but this has
* a hardware issue that results in unreliable timestamps. Force
* these devices to timestamp at the MAC.
*/
if (chip->info->family == MV88E6XXX_FAMILY_6341) {
u16 val = MV88E6341_PTP_CFG_UPDATE |
MV88E6341_PTP_CFG_MODE_IDX |
MV88E6341_PTP_CFG_MODE_TS_AT_MAC;
err = mv88e6xxx_ptp_write(chip, MV88E6341_PTP_CFG, val);
if (err)
return err;
}
return 0;
}

9
drivers/net/dsa/mv88e6xxx/hwtstamp.h
View File

@ -34,6 +34,15 @@
/* Offset 0x02: Timestamp Arrival Capture Pointers */
#define MV88E6XXX_PTP_TS_ARRIVAL_PTR 0x02
/* Offset 0x07: PTP Global Configuration */
#define MV88E6341_PTP_CFG 0x07
#define MV88E6341_PTP_CFG_UPDATE 0x8000
#define MV88E6341_PTP_CFG_IDX_MASK 0x7f00
#define MV88E6341_PTP_CFG_DATA_MASK 0x00ff
#define MV88E6341_PTP_CFG_MODE_IDX 0x0
#define MV88E6341_PTP_CFG_MODE_TS_AT_PHY 0x00
#define MV88E6341_PTP_CFG_MODE_TS_AT_MAC 0x80
/* Offset 0x08: PTP Interrupt Status */
#define MV88E6XXX_PTP_IRQ_STATUS 0x08