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142 lines
4 KiB
C
142 lines
4 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Meson GXL Internal PHY Driver
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*
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* Copyright (C) 2015 Amlogic, Inc. All rights reserved.
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* Copyright (C) 2016 BayLibre, SAS. All rights reserved.
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* Author: Neil Armstrong <narmstrong@baylibre.com>
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*/
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#include <config.h>
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#include <common.h>
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#include <linux/bitops.h>
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#include <dm.h>
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#include <phy.h>
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/* This function is provided to cope with the possible failures of this phy
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* during aneg process. When aneg fails, the PHY reports that aneg is done
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* but the value found in MII_LPA is wrong:
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* - Early failures: MII_LPA is just 0x0001. if MII_EXPANSION reports that
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* the link partner (LP) supports aneg but the LP never acked our base
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* code word, it is likely that we never sent it to begin with.
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* - Late failures: MII_LPA is filled with a value which seems to make sense
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* but it actually is not what the LP is advertising. It seems that we
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* can detect this using a magic bit in the WOL bank (reg 12 - bit 12).
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* If this particular bit is not set when aneg is reported being done,
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* it means MII_LPA is likely to be wrong.
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*
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* In both case, forcing a restart of the aneg process solve the problem.
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* When this failure happens, the first retry is usually successful but,
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* in some cases, it may take up to 6 retries to get a decent result
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*/
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int meson_gxl_startup(struct phy_device *phydev)
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{
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unsigned int retries = 10;
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int ret, wol, lpa, exp;
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restart_aneg:
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ret = genphy_update_link(phydev);
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if (ret)
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return ret;
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if (phydev->autoneg == AUTONEG_ENABLE) {
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/* Need to access WOL bank, make sure the access is open */
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ret = phy_write(phydev, MDIO_DEVAD_NONE, 0x14, 0x0000);
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if (ret)
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return ret;
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ret = phy_write(phydev, MDIO_DEVAD_NONE, 0x14, 0x0400);
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if (ret)
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return ret;
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ret = phy_write(phydev, MDIO_DEVAD_NONE, 0x14, 0x0000);
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if (ret)
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return ret;
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ret = phy_write(phydev, MDIO_DEVAD_NONE, 0x14, 0x0400);
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if (ret)
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return ret;
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/* Request LPI_STATUS WOL register */
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ret = phy_write(phydev, MDIO_DEVAD_NONE, 0x14, 0x8D80);
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if (ret)
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return ret;
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/* Read LPI_STATUS value */
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wol = phy_read(phydev, MDIO_DEVAD_NONE, 0x15);
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if (wol < 0)
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return wol;
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lpa = phy_read(phydev, MDIO_DEVAD_NONE, MII_LPA);
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if (lpa < 0)
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return lpa;
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exp = phy_read(phydev, MDIO_DEVAD_NONE, MII_EXPANSION);
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if (exp < 0)
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return exp;
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if (!(wol & BIT(12)) ||
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((exp & EXPANSION_NWAY) && !(lpa & LPA_LPACK))) {
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/* Looks like aneg failed after all */
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if (!retries) {
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printf("%s LPA corruption max attempts\n",
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phydev->dev->name);
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return -ETIMEDOUT;
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}
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printf("%s LPA corruption - aneg restart\n",
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phydev->dev->name);
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ret = genphy_restart_aneg(phydev);
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if (ret)
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return ret;
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--retries;
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goto restart_aneg;
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}
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}
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return genphy_parse_link(phydev);
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}
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static int meson_gxl_phy_config(struct phy_device *phydev)
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{
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/* Enable Analog and DSP register Bank access by */
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phy_write(phydev, MDIO_DEVAD_NONE, 0x14, 0x0000);
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phy_write(phydev, MDIO_DEVAD_NONE, 0x14, 0x0400);
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phy_write(phydev, MDIO_DEVAD_NONE, 0x14, 0x0000);
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phy_write(phydev, MDIO_DEVAD_NONE, 0x14, 0x0400);
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/* Write Analog register 23 */
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phy_write(phydev, MDIO_DEVAD_NONE, 0x17, 0x8E0D);
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phy_write(phydev, MDIO_DEVAD_NONE, 0x14, 0x4417);
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/* Enable fractional PLL */
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phy_write(phydev, MDIO_DEVAD_NONE, 0x17, 0x0005);
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phy_write(phydev, MDIO_DEVAD_NONE, 0x14, 0x5C1B);
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/* Program fraction FR_PLL_DIV1 */
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phy_write(phydev, MDIO_DEVAD_NONE, 0x17, 0x029A);
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phy_write(phydev, MDIO_DEVAD_NONE, 0x14, 0x5C1D);
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/* Program fraction FR_PLL_DIV1 */
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phy_write(phydev, MDIO_DEVAD_NONE, 0x17, 0xAAAA);
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phy_write(phydev, MDIO_DEVAD_NONE, 0x14, 0x5C1C);
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return genphy_config(phydev);
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}
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static struct phy_driver meson_gxl_phy_driver = {
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.name = "Meson GXL Internal PHY",
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.uid = 0x01814400,
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.mask = 0xfffffff0,
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.features = PHY_BASIC_FEATURES,
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.config = &meson_gxl_phy_config,
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.startup = &meson_gxl_startup,
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.shutdown = &genphy_shutdown,
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};
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int phy_meson_gxl_init(void)
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{
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phy_register(&meson_gxl_phy_driver);
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return 0;
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}
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