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net: phy: microchip: lan937x: add support for 100BaseTX PHY

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Add support of 100BaseTX PHY build in to LAN9371 and LAN9372 switches.

Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
Reviewed-by: Florian Fainelli <florian.fainelli@broadcom.com>
Reviewed-by: Michal Kubiak <michal.kubiak@intel.com>
Acked-by: Arun Ramadoss <arun.ramadoss@microchip.com>
Link: https://patch.msgid.link/20240706154201.1456098-1-o.rempel@pengutronix.de
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Oleksij Rempel 2024-07-06 17:42:01 +02:00 committed by Paolo Abeni
parent 0787ab206f
commit 870a1dbcbc
1 changed files with 125 additions and 1 deletions
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126
drivers/net/phy/microchip.c
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@ -12,8 +12,14 @@
#include <linux/of.h>
#include <dt-bindings/net/microchip-lan78xx.h>
#define PHY_ID_LAN937X_TX 0x0007c190
#define LAN937X_MODE_CTRL_STATUS_REG 0x11
#define LAN937X_AUTOMDIX_EN BIT(7)
#define LAN937X_MDI_MODE BIT(6)
#define DRIVER_AUTHOR "WOOJUNG HUH <woojung.huh@microchip.com>"
#define DRIVER_DESC "Microchip LAN88XX PHY driver"
#define DRIVER_DESC "Microchip LAN88XX/LAN937X TX PHY driver"
struct lan88xx_priv {
int chip_id;
@ -373,6 +379,115 @@ static void lan88xx_link_change_notify(struct phy_device *phydev)
}
}
/**
* lan937x_tx_read_mdix_status - Read the MDIX status for the LAN937x TX PHY.
* @phydev: Pointer to the phy_device structure.
*
* This function reads the MDIX status of the LAN937x TX PHY and sets the
* mdix_ctrl and mdix fields of the phy_device structure accordingly.
* Note that MDIX status is not supported in AUTO mode, and will be set
* to invalid in such cases.
*
* Return: 0 on success, a negative error code on failure.
*/
static int lan937x_tx_read_mdix_status(struct phy_device *phydev)
{
int ret;
ret = phy_read(phydev, LAN937X_MODE_CTRL_STATUS_REG);
if (ret < 0)
return ret;
if (ret & LAN937X_AUTOMDIX_EN) {
phydev->mdix_ctrl = ETH_TP_MDI_AUTO;
/* MDI/MDIX status is unknown */
phydev->mdix = ETH_TP_MDI_INVALID;
} else if (ret & LAN937X_MDI_MODE) {
phydev->mdix_ctrl = ETH_TP_MDI_X;
phydev->mdix = ETH_TP_MDI_X;
} else {
phydev->mdix_ctrl = ETH_TP_MDI;
phydev->mdix = ETH_TP_MDI;
}
return 0;
}
/**
* lan937x_tx_read_status - Read the status for the LAN937x TX PHY.
* @phydev: Pointer to the phy_device structure.
*
* This function reads the status of the LAN937x TX PHY and updates the
* phy_device structure accordingly.
*
* Return: 0 on success, a negative error code on failure.
*/
static int lan937x_tx_read_status(struct phy_device *phydev)
{
int ret;
ret = genphy_read_status(phydev);
if (ret < 0)
return ret;
return lan937x_tx_read_mdix_status(phydev);
}
/**
* lan937x_tx_set_mdix - Set the MDIX mode for the LAN937x TX PHY.
* @phydev: Pointer to the phy_device structure.
*
* This function configures the MDIX mode of the LAN937x TX PHY based on the
* mdix_ctrl field of the phy_device structure. The MDIX mode can be set to
* MDI (straight-through), MDIX (crossover), or AUTO (auto-MDIX). If the mode
* is not recognized, it returns 0 without making any changes.
*
* Return: 0 on success, a negative error code on failure.
*/
static int lan937x_tx_set_mdix(struct phy_device *phydev)
{
u16 val;
switch (phydev->mdix_ctrl) {
case ETH_TP_MDI:
val = 0;
break;
case ETH_TP_MDI_X:
val = LAN937X_MDI_MODE;
break;
case ETH_TP_MDI_AUTO:
val = LAN937X_AUTOMDIX_EN;
break;
default:
return 0;
}
return phy_modify(phydev, LAN937X_MODE_CTRL_STATUS_REG,
LAN937X_AUTOMDIX_EN | LAN937X_MDI_MODE, val);
}
/**
* lan937x_tx_config_aneg - Configure auto-negotiation and fixed modes for the
* LAN937x TX PHY.
* @phydev: Pointer to the phy_device structure.
*
* This function configures the MDIX mode for the LAN937x TX PHY and then
* proceeds to configure the auto-negotiation or fixed mode settings
* based on the phy_device structure.
*
* Return: 0 on success, a negative error code on failure.
*/
static int lan937x_tx_config_aneg(struct phy_device *phydev)
{
int ret;
ret = lan937x_tx_set_mdix(phydev);
if (ret < 0)
return ret;
return genphy_config_aneg(phydev);
}
static struct phy_driver microchip_phy_driver[] = {
{
.phy_id = 0x0007c132,
@ -400,12 +515,21 @@ static struct phy_driver microchip_phy_driver[] = {
.set_wol = lan88xx_set_wol,
.read_page = lan88xx_read_page,
.write_page = lan88xx_write_page,
},
{
PHY_ID_MATCH_MODEL(PHY_ID_LAN937X_TX),
.name = "Microchip LAN937x TX",
.suspend = genphy_suspend,
.resume = genphy_resume,
.config_aneg = lan937x_tx_config_aneg,
.read_status = lan937x_tx_read_status,
} };
module_phy_driver(microchip_phy_driver);
static struct mdio_device_id __maybe_unused microchip_tbl[] = {
{ 0x0007c132, 0xfffffff2 },
{ PHY_ID_MATCH_MODEL(PHY_ID_LAN937X_TX) },
{ }
};