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ethtool: provide UAPI for PHY master/slave configuration.

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This UAPI is needed for BroadR-Reach 100BASE-T1 devices. Due to lack of
auto-negotiation support, we needed to be able to configure the
MASTER-SLAVE role of the port manually or from an application in user
space.

The same UAPI can be used for 1000BASE-T or MultiGBASE-T devices to
force MASTER or SLAVE role. See IEEE 802.3-2018:
22.2.4.3.7 MASTER-SLAVE control register (Register 9)
22.2.4.3.8 MASTER-SLAVE status register (Register 10)
40.5.2 MASTER-SLAVE configuration resolution
45.2.1.185.1 MASTER-SLAVE config value (1.2100.14)
45.2.7.10 MultiGBASE-T AN control 1 register (Register 7.32)

The MASTER-SLAVE role affects the clock configuration:

-------------------------------------------------------------------------------
When the  PHY is configured as MASTER, the PMA Transmit function shall
source TX_TCLK from a local clock source. When configured as SLAVE, the
PMA Transmit function shall source TX_TCLK from the clock recovered from
data stream provided by MASTER.

iMX6Q                     KSZ9031                XXX
------\                /-----------\        /------------\
      |                |           |        |            |
 MAC  |<----RGMII----->| PHY Slave |<------>| PHY Master |
      |<--- 125 MHz ---+-<------/  |        | \          |
------/                \-----------/        \------------/
                                               ^
                                                \-TX_TCLK

-------------------------------------------------------------------------------

Since some clock or link related issues are only reproducible in a
specific MASTER-SLAVE-role, MAC and PHY configuration, it is beneficial
to provide generic (not 100BASE-T1 specific) interface to the user space
for configuration flexibility and trouble shooting.

Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Oleksij Rempel
2020-05-05 08:35:05 +02:00
committed by David S. Miller
parent 3d59a5837c
commit bdbdac7649
9 changed files with 197 additions and 18 deletions
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16
include/uapi/linux/ethtool.h
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@@ -1666,6 +1666,18 @@ static inline int ethtool_validate_duplex(__u8 duplex)
return 0;
}
#define MASTER_SLAVE_CFG_UNSUPPORTED 0
#define MASTER_SLAVE_CFG_UNKNOWN 1
#define MASTER_SLAVE_CFG_MASTER_PREFERRED 2
#define MASTER_SLAVE_CFG_SLAVE_PREFERRED 3
#define MASTER_SLAVE_CFG_MASTER_FORCE 4
#define MASTER_SLAVE_CFG_SLAVE_FORCE 5
#define MASTER_SLAVE_STATE_UNSUPPORTED 0
#define MASTER_SLAVE_STATE_UNKNOWN 1
#define MASTER_SLAVE_STATE_MASTER 2
#define MASTER_SLAVE_STATE_SLAVE 3
#define MASTER_SLAVE_STATE_ERR 4
/* Which connector port. */
#define PORT_TP 0x00
#define PORT_AUI 0x01
@@ -1904,7 +1916,9 @@ struct ethtool_link_settings {
__u8 eth_tp_mdix_ctrl;
__s8 link_mode_masks_nwords;
__u8 transceiver;
__u8 reserved1[3];
__u8 master_slave_cfg;
__u8 master_slave_state;
__u8 reserved1[1];
__u32 reserved[7];
__u32 link_mode_masks[0];
/* layout of link_mode_masks fields: