diff --git a/MAINTAINERS b/MAINTAINERS index e6e729b13de2..8ae7578a0532 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -9158,6 +9158,7 @@ M: Caleb James DeLisle L: linux-mips@vger.kernel.org S: Maintained F: Documentation/devicetree/bindings/phy/econet,en751221-pcie-phy.yaml +F: drivers/phy/phy-econet-pcie.c ECRYPT FILE SYSTEM M: Tyler Hicks diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig index ab96ee5858c1..7ef342f4bbb6 100644 --- a/drivers/phy/Kconfig +++ b/drivers/phy/Kconfig @@ -79,6 +79,18 @@ config PHY_EYEQ5_ETH shared register region called OLB. If M is selected, the module will be called phy-eyeq5-eth. +config PHY_ECONET_PCIE + tristate "EcoNet PCIe-PHY Driver" + depends on ECONET || COMPILE_TEST + depends on OF + select GENERIC_PHY + select REGMAP_MMIO + help + Say Y here to add support for EcoNet PCIe PHY driver. + This driver create the basic PHY instance and provides initialize + callback for PCIe GEN1 and GEN2 ports. This PHY is found on + EcoNet SoCs including EN751221 and EN7528. + config PHY_GOOGLE_USB tristate "Google Tensor SoC USB PHY driver" select GENERIC_PHY diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile index f31767745123..1e69ed50fb17 100644 --- a/drivers/phy/Makefile +++ b/drivers/phy/Makefile @@ -9,6 +9,7 @@ obj-$(CONFIG_GENERIC_PHY) += phy-core.o obj-$(CONFIG_GENERIC_PHY_MIPI_DPHY) += phy-core-mipi-dphy.o obj-$(CONFIG_PHY_AIROHA_PCIE) += phy-airoha-pcie.o obj-$(CONFIG_PHY_CAN_TRANSCEIVER) += phy-can-transceiver.o +obj-$(CONFIG_PHY_ECONET_PCIE) += phy-econet-pcie.o obj-$(CONFIG_PHY_EYEQ5_ETH) += phy-eyeq5-eth.o obj-$(CONFIG_PHY_GOOGLE_USB) += phy-google-usb.o obj-$(CONFIG_USB_LGM_PHY) += phy-lgm-usb.o diff --git a/drivers/phy/phy-econet-pcie.c b/drivers/phy/phy-econet-pcie.c new file mode 100644 index 000000000000..96be69d1ffeb --- /dev/null +++ b/drivers/phy/phy-econet-pcie.c @@ -0,0 +1,182 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Author: Caleb James DeLisle + * Ahmed Naseef + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +/* Rx detection timing for EN751221: 16*8 clock cycles */ +#define EN751221_RXDET_VAL 16 + +/* Rx detection timing when in power mode 3 */ +#define EN75_RXDET_P3_REG 0xa28 +#define EN75_RXDET_P3_MASK GENMASK(17, 9) + +/* Rx detection timing when in power mode 2 */ +#define EN75_RXDET_P2_REG 0xa2c +#define EN75_RXDET_P2_MASK GENMASK(8, 0) + +/* Rx impedance */ +#define EN75_RX_IMPEDANCE_REG 0xb2c +#define EN75_RX_IMPEDANCE_MASK GENMASK(13, 12) +enum en75_rx_impedance { + EN75_RX_IMPEDANCE_100_OHM = 0, + EN75_RX_IMPEDANCE_95_OHM = 1, + EN75_RX_IMPEDANCE_90_OHM = 2, +}; + +/* PLL Invert clock */ +#define EN75_PLL_PH_INV_REG 0x4a0 +#define EN75_PLL_PH_INV_MASK BIT(5) + +struct en75_phy_op { + u32 reg; + u32 mask; + u32 val; +}; + +struct en7528_pcie_phy { + struct regmap *regmap; + const struct en75_phy_op *data; +}; + +/* Port 0 PHY: set LCDDS_CLK_PH_INV for PLL operation */ +static const struct en75_phy_op en7528_phy_gen1[] = { + { + .reg = EN75_PLL_PH_INV_REG, + .mask = EN75_PLL_PH_INV_MASK, + .val = 1, + }, + { /* sentinel */ } +}; + +/* EN7528 Port 1 PHY: Rx impedance tuning, target R -5 Ohm */ +static const struct en75_phy_op en7528_phy_gen2[] = { + { + .reg = EN75_RX_IMPEDANCE_REG, + .mask = EN75_RX_IMPEDANCE_MASK, + .val = EN75_RX_IMPEDANCE_95_OHM, + }, + { /* sentinel */ } +}; + +/* EN751221 Port 1 PHY, set RX detect to 16*8 clock cycles */ +static const struct en75_phy_op en751221_phy_gen2[] = { + { + .reg = EN75_RXDET_P3_REG, + .mask = EN75_RXDET_P3_MASK, + .val = EN751221_RXDET_VAL, + }, + { + .reg = EN75_RXDET_P2_REG, + .mask = EN75_RXDET_P2_MASK, + .val = EN751221_RXDET_VAL, + }, + { /* sentinel */ } +}; + +static int en75_pcie_phy_init(struct phy *phy) +{ + struct en7528_pcie_phy *ephy = phy_get_drvdata(phy); + const struct en75_phy_op *data = ephy->data; + int i, ret; + u32 val; + + for (i = 0; data[i].mask || data[i].val; i++) { + if (i) + usleep_range(1000, 2000); + + val = field_prep(data[i].mask, data[i].val); + + ret = regmap_update_bits(ephy->regmap, data[i].reg, + data[i].mask, val); + if (ret) + return ret; + } + + return 0; +} + +static const struct phy_ops en75_pcie_phy_ops = { + .init = en75_pcie_phy_init, + .owner = THIS_MODULE, +}; + +static int en75_pcie_phy_probe(struct platform_device *pdev) +{ + struct regmap_config regmap_config = { + .reg_bits = 32, + .val_bits = 32, + .reg_stride = 4, + }; + struct device *dev = &pdev->dev; + const struct en75_phy_op *data; + struct phy_provider *provider; + struct en7528_pcie_phy *ephy; + void __iomem *base; + struct phy *phy; + int i; + + data = of_device_get_match_data(dev); + if (!data) + return -EINVAL; + + ephy = devm_kzalloc(dev, sizeof(*ephy), GFP_KERNEL); + if (!ephy) + return -ENOMEM; + + ephy->data = data; + + base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(base)) + return PTR_ERR(base); + + /* Set max_register to highest used register */ + for (i = 0; data[i].mask || data[i].val; i++) + if (data[i].reg > regmap_config.max_register) + regmap_config.max_register = data[i].reg; + + ephy->regmap = devm_regmap_init_mmio(dev, base, ®map_config); + if (IS_ERR(ephy->regmap)) + return PTR_ERR(ephy->regmap); + + phy = devm_phy_create(dev, dev->of_node, &en75_pcie_phy_ops); + if (IS_ERR(phy)) + return PTR_ERR(phy); + + phy_set_drvdata(phy, ephy); + + provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate); + + return PTR_ERR_OR_ZERO(provider); +} + +static const struct of_device_id en75_pcie_phy_ids[] = { + { .compatible = "econet,en7528-pcie-gen1", .data = en7528_phy_gen1 }, + { .compatible = "econet,en7528-pcie-gen2", .data = en7528_phy_gen2 }, + { .compatible = "econet,en751221-pcie-gen1", .data = en7528_phy_gen1 }, + { .compatible = "econet,en751221-pcie-gen2", .data = en751221_phy_gen2 }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, en75_pcie_phy_ids); + +static struct platform_driver en75_pcie_phy_driver = { + .probe = en75_pcie_phy_probe, + .driver = { + .name = "econet-pcie-phy", + .of_match_table = en75_pcie_phy_ids, + }, +}; +module_platform_driver(en75_pcie_phy_driver); + +MODULE_AUTHOR("Caleb James DeLisle "); +MODULE_DESCRIPTION("EcoNet PCIe PHY driver"); +MODULE_LICENSE("GPL");