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// SPDX-License-Identifier: GPL-2.0+
/*
* Driver for Microchip 10BASE-T1S PHYs
*
* Support: Microchip Phys:
* lan8670/1/2 Rev.B1
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/phy.h>
#define PHY_ID_LAN867X_REVB1 0x0007C162
#define LAN867X_REG_STS2 0x0019
#define LAN867x_RESET_COMPLETE_STS BIT(11)
/* The arrays below are pulled from the following table from AN1699
* Access MMD Address Value Mask
* RMW 0x1F 0x00D0 0x0002 0x0E03
* RMW 0x1F 0x00D1 0x0000 0x0300
* RMW 0x1F 0x0084 0x3380 0xFFC0
* RMW 0x1F 0x0085 0x0006 0x000F
* RMW 0x1F 0x008A 0xC000 0xF800
* RMW 0x1F 0x0087 0x801C 0x801C
* RMW 0x1F 0x0088 0x033F 0x1FFF
* W 0x1F 0x008B 0x0404 ------
* RMW 0x1F 0x0080 0x0600 0x0600
* RMW 0x1F 0x00F1 0x2400 0x7F00
* RMW 0x1F 0x0096 0x2000 0x2000
* W 0x1F 0x0099 0x7F80 ------
*/
static const u32 lan867x_revb1_fixup_registers[12] = {
0x00D0, 0x00D1, 0x0084, 0x0085,
0x008A, 0x0087, 0x0088, 0x008B,
0x0080, 0x00F1, 0x0096, 0x0099,
};
static const u16 lan867x_revb1_fixup_values[12] = {
0x0002, 0x0000, 0x3380, 0x0006,
0xC000, 0x801C, 0x033F, 0x0404,
0x0600, 0x2400, 0x2000, 0x7F80,
};
static const u16 lan867x_revb1_fixup_masks[12] = {
0x0E03, 0x0300, 0xFFC0, 0x000F,
0xF800, 0x801C, 0x1FFF, 0xFFFF,
0x0600, 0x7F00, 0x2000, 0xFFFF,
};
static int lan867x_revb1_config_init(struct phy_device *phydev)
{
int err;
/* The chip completes a reset in 3us, we might get here earlier than
* that, as an added margin we'll conditionally sleep 5us.
*/
err = phy_read_mmd(phydev, MDIO_MMD_VEND2, LAN867X_REG_STS2);
if (err < 0)
return err;
if (!(err & LAN867x_RESET_COMPLETE_STS)) {
udelay(5);
err = phy_read_mmd(phydev, MDIO_MMD_VEND2, LAN867X_REG_STS2);
if (err < 0)
return err;
if (!(err & LAN867x_RESET_COMPLETE_STS)) {
phydev_err(phydev, "PHY reset failed\n");
return -ENODEV;
}
}
/* Reference to AN1699
* https://ww1.microchip.com/downloads/aemDocuments/documents/AIS/ProductDocuments/SupportingCollateral/AN-LAN8670-1-2-config-60001699.pdf
* AN1699 says Read, Modify, Write, but the Write is not required if the
* register already has the required value. So it is safe to use
* phy_modify_mmd here.
*/
for (int i = 0; i < ARRAY_SIZE(lan867x_revb1_fixup_registers); i++) {
err = phy_modify_mmd(phydev, MDIO_MMD_VEND2,
lan867x_revb1_fixup_registers[i],
lan867x_revb1_fixup_masks[i],
lan867x_revb1_fixup_values[i]);
if (err)
return err;
}
return 0;
}
static int lan867x_read_status(struct phy_device *phydev)
{
/* The phy has some limitations, namely:
* - always reports link up
* - only supports 10MBit half duplex
* - does not support auto negotiate
*/
phydev->link = 1;
phydev->duplex = DUPLEX_HALF;
phydev->speed = SPEED_10;
phydev->autoneg = AUTONEG_DISABLE;
return 0;
}
static struct phy_driver microchip_t1s_driver[] = {
{
PHY_ID_MATCH_EXACT(PHY_ID_LAN867X_REVB1),
.name = "LAN867X Rev.B1",
.features = PHY_BASIC_T1S_P2MP_FEATURES,
.config_init = lan867x_revb1_config_init,
.read_status = lan867x_read_status,
.get_plca_cfg = genphy_c45_plca_get_cfg,
.set_plca_cfg = genphy_c45_plca_set_cfg,
.get_plca_status = genphy_c45_plca_get_status,
}
};
module_phy_driver(microchip_t1s_driver);
static struct mdio_device_id __maybe_unused tbl[] = {
{ PHY_ID_MATCH_EXACT(PHY_ID_LAN867X_REVB1) },
{ }
};
MODULE_DEVICE_TABLE(mdio, tbl);
MODULE_DESCRIPTION("Microchip 10BASE-T1S PHYs driver");
MODULE_AUTHOR("Ramón Nordin Rodriguez");
MODULE_LICENSE("GPL");
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