// SPDX-License-Identifier: GPL-2.0+ /* * Atheros PHY drivers * * Copyright 2011, 2013 Freescale Semiconductor, Inc. * author Andy Fleming * Copyright (c) 2019 Michael Walle */ #include #include #include #include #include #include #define AR803x_PHY_DEBUG_ADDR_REG 0x1d #define AR803x_PHY_DEBUG_DATA_REG 0x1e /* Debug registers */ #define AR803x_DEBUG_REG_0 0x0 #define AR803x_RGMII_RX_CLK_DLY BIT(15) #define AR803x_DEBUG_REG_5 0x5 #define AR803x_RGMII_TX_CLK_DLY BIT(8) #define AR803x_DEBUG_REG_1F 0x1f #define AR803x_PLL_ON BIT(2) #define AR803x_RGMII_1V8 BIT(3) /* CLK_25M register is at MMD 7, address 0x8016 */ #define AR803x_CLK_25M_SEL_REG 0x8016 #define AR803x_CLK_25M_MASK GENMASK(4, 2) #define AR803x_CLK_25M_25MHZ_XTAL 0 #define AR803x_CLK_25M_25MHZ_DSP 1 #define AR803x_CLK_25M_50MHZ_PLL 2 #define AR803x_CLK_25M_50MHZ_DSP 3 #define AR803x_CLK_25M_62_5MHZ_PLL 4 #define AR803x_CLK_25M_62_5MHZ_DSP 5 #define AR803x_CLK_25M_125MHZ_PLL 6 #define AR803x_CLK_25M_125MHZ_DSP 7 #define AR8035_CLK_25M_MASK GENMASK(4, 3) #define AR803x_CLK_25M_DR_MASK GENMASK(8, 7) #define AR803x_CLK_25M_DR_FULL 0 #define AR803x_CLK_25M_DR_HALF 1 #define AR803x_CLK_25M_DR_QUARTER 2 #define AR8021_PHY_ID 0x004dd040 #define AR8031_PHY_ID 0x004dd074 #define AR8035_PHY_ID 0x004dd072 struct ar803x_priv { int flags; #define AR803x_FLAG_KEEP_PLL_ENABLED BIT(0) /* don't turn off internal PLL */ #define AR803x_FLAG_RGMII_1V8 BIT(1) /* use 1.8V RGMII I/O voltage */ u16 clk_25m_reg; u16 clk_25m_mask; }; static int ar803x_debug_reg_read(struct phy_device *phydev, u16 reg) { int ret; ret = phy_write(phydev, MDIO_DEVAD_NONE, AR803x_PHY_DEBUG_ADDR_REG, reg); if (ret < 0) return ret; return phy_read(phydev, MDIO_DEVAD_NONE, AR803x_PHY_DEBUG_DATA_REG); } static int ar803x_debug_reg_mask(struct phy_device *phydev, u16 reg, u16 clear, u16 set) { int val; val = ar803x_debug_reg_read(phydev, reg); if (val < 0) return val; val &= 0xffff; val &= ~clear; val |= set; return phy_write(phydev, MDIO_DEVAD_NONE, AR803x_PHY_DEBUG_DATA_REG, val); } static int ar803x_enable_rx_delay(struct phy_device *phydev, bool on) { u16 clear = 0, set = 0; if (on) set = AR803x_RGMII_RX_CLK_DLY; else clear = AR803x_RGMII_RX_CLK_DLY; return ar803x_debug_reg_mask(phydev, AR803x_DEBUG_REG_0, clear, set); } static int ar803x_enable_tx_delay(struct phy_device *phydev, bool on) { u16 clear = 0, set = 0; if (on) set = AR803x_RGMII_TX_CLK_DLY; else clear = AR803x_RGMII_TX_CLK_DLY; return ar803x_debug_reg_mask(phydev, AR803x_DEBUG_REG_5, clear, set); } static int ar8021_config(struct phy_device *phydev) { phy_write(phydev, MDIO_DEVAD_NONE, MII_BMCR, BMCR_ANENABLE | BMCR_ANRESTART); ar803x_enable_tx_delay(phydev, true); phydev->supported = phydev->drv->features; return 0; } static int ar803x_delay_config(struct phy_device *phydev) { int ret; if (phydev->interface == PHY_INTERFACE_MODE_RGMII_TXID || phydev->interface == PHY_INTERFACE_MODE_RGMII_ID) ret = ar803x_enable_tx_delay(phydev, true); else ret = ar803x_enable_tx_delay(phydev, false); if (phydev->interface == PHY_INTERFACE_MODE_RGMII_RXID || phydev->interface == PHY_INTERFACE_MODE_RGMII_ID) ret = ar803x_enable_rx_delay(phydev, true); else ret = ar803x_enable_rx_delay(phydev, false); return ret; } static int ar803x_regs_config(struct phy_device *phydev) { struct ar803x_priv *priv = phydev->priv; u16 set = 0, clear = 0; int val; int ret; /* no configuration available */ if (!priv) return 0; /* * Only supported on the AR8031, AR8035 has strappings for the PLL mode * as well as the RGMII voltage. */ if (phydev->drv->uid == AR8031_PHY_ID) { if (priv->flags & AR803x_FLAG_KEEP_PLL_ENABLED) set |= AR803x_PLL_ON; else clear |= AR803x_PLL_ON; if (priv->flags & AR803x_FLAG_RGMII_1V8) set |= AR803x_RGMII_1V8; else clear |= AR803x_RGMII_1V8; ret = ar803x_debug_reg_mask(phydev, AR803x_DEBUG_REG_1F, clear, set); if (ret < 0) return ret; } /* save the write access if the mask is empty */ if (priv->clk_25m_mask) { val = phy_read_mmd(phydev, MDIO_MMD_AN, AR803x_CLK_25M_SEL_REG); if (val < 0) return val; val &= ~priv->clk_25m_mask; val |= priv->clk_25m_reg; ret = phy_write_mmd(phydev, MDIO_MMD_AN, AR803x_CLK_25M_SEL_REG, val); if (ret < 0) return ret; } return 0; } static int ar803x_of_init(struct phy_device *phydev) { struct ar803x_priv *priv; ofnode node, vddio_reg_node; u32 strength, freq, min_uV, max_uV; int sel; node = phy_get_ofnode(phydev); if (!ofnode_valid(node)) return 0; priv = malloc(sizeof(*priv)); if (!priv) return -ENOMEM; memset(priv, 0, sizeof(*priv)); phydev->priv = priv; debug("%s: found PHY node: %s\n", __func__, ofnode_get_name(node)); if (ofnode_read_bool(node, "qca,keep-pll-enabled")) priv->flags |= AR803x_FLAG_KEEP_PLL_ENABLED; /* * We can't use the regulator framework because the regulator is * a subnode of the PHY. So just read the two properties we are * interested in. */ vddio_reg_node = ofnode_find_subnode(node, "vddio-regulator"); if (ofnode_valid(vddio_reg_node)) { min_uV = ofnode_read_u32_default(vddio_reg_node, "regulator-min-microvolt", 0); max_uV = ofnode_read_u32_default(vddio_reg_node, "regulator-max-microvolt", 0); if (min_uV != max_uV) { free(priv); return -EINVAL; } switch (min_uV) { case 1500000: break; case 1800000: priv->flags |= AR803x_FLAG_RGMII_1V8; break; default: free(priv); return -EINVAL; } } /* * Get the CLK_25M frequency from the device tree. Only XTAL and PLL * sources are supported right now. There is also the possibilty to use * the DSP as frequency reference, this is used for synchronous * ethernet. */ if (!ofnode_read_u32(node, "qca,clk-out-frequency", &freq)) { switch (freq) { case 25000000: sel = AR803x_CLK_25M_25MHZ_XTAL; break; case 50000000: sel = AR803x_CLK_25M_50MHZ_PLL; break; case 62500000: sel = AR803x_CLK_25M_62_5MHZ_PLL; break; case 125000000: sel = AR803x_CLK_25M_125MHZ_PLL; break; default: dev_err(phydev->dev, "invalid qca,clk-out-frequency\n"); free(priv); return -EINVAL; } priv->clk_25m_mask |= AR803x_CLK_25M_MASK; priv->clk_25m_reg |= FIELD_PREP(AR803x_CLK_25M_MASK, sel); /* * Fixup for the AR8035 which only has two bits. The two * remaining bits map to the same frequencies. */ if (phydev->drv->uid == AR8035_PHY_ID) { priv->clk_25m_reg &= AR8035_CLK_25M_MASK; priv->clk_25m_mask &= AR8035_CLK_25M_MASK; } } if (phydev->drv->uid == AR8031_PHY_ID && !ofnode_read_u32(node, "qca,clk-out-strength", &strength)) { switch (strength) { case AR803X_STRENGTH_FULL: sel = AR803x_CLK_25M_DR_FULL; break; case AR803X_STRENGTH_HALF: sel = AR803x_CLK_25M_DR_HALF; break; case AR803X_STRENGTH_QUARTER: sel = AR803x_CLK_25M_DR_QUARTER; break; default: dev_err(phydev->dev, "invalid qca,clk-out-strength\n"); free(priv); return -EINVAL; } priv->clk_25m_mask |= AR803x_CLK_25M_DR_MASK; priv->clk_25m_reg |= FIELD_PREP(AR803x_CLK_25M_DR_MASK, sel); } debug("%s: flags=%x clk_25m_reg=%04x clk_25m_mask=%04x\n", __func__, priv->flags, priv->clk_25m_reg, priv->clk_25m_mask); return 0; } static int ar803x_config(struct phy_device *phydev) { int ret; ret = ar803x_of_init(phydev); if (ret < 0) return ret; ret = ar803x_delay_config(phydev); if (ret < 0) return ret; ret = ar803x_regs_config(phydev); if (ret < 0) return ret; phydev->supported = phydev->drv->features; genphy_config_aneg(phydev); genphy_restart_aneg(phydev); return 0; } static struct phy_driver AR8021_driver = { .name = "AR8021", .uid = AR8021_PHY_ID, .mask = 0xfffffff0, .features = PHY_GBIT_FEATURES, .config = ar8021_config, .startup = genphy_startup, .shutdown = genphy_shutdown, }; static struct phy_driver AR8031_driver = { .name = "AR8031/AR8033", .uid = AR8031_PHY_ID, .mask = 0xffffffef, .features = PHY_GBIT_FEATURES, .config = ar803x_config, .startup = genphy_startup, .shutdown = genphy_shutdown, }; static struct phy_driver AR8035_driver = { .name = "AR8035", .uid = AR8035_PHY_ID, .mask = 0xffffffef, .features = PHY_GBIT_FEATURES, .config = ar803x_config, .startup = genphy_startup, .shutdown = genphy_shutdown, }; int phy_atheros_init(void) { phy_register(&AR8021_driver); phy_register(&AR8031_driver); phy_register(&AR8035_driver); return 0; }