Add Starfive JH7110 PCIe 2.0 PHY driver, which is generic PHY driver and can be used as USB 3.0 driver.
Signed-off-by: Minda Chen <[email protected]> --- drivers/phy/starfive/Kconfig | 6 + drivers/phy/starfive/Makefile | 1 + drivers/phy/starfive/phy-jh7110-pcie.c | 211 +++++++++++++++++++++++++ 3 files changed, 218 insertions(+) create mode 100644 drivers/phy/starfive/phy-jh7110-pcie.c diff --git a/drivers/phy/starfive/Kconfig b/drivers/phy/starfive/Kconfig index 5d78fde12e..eaebb2b47d 100644 --- a/drivers/phy/starfive/Kconfig +++ b/drivers/phy/starfive/Kconfig @@ -4,6 +4,12 @@ menu "Starfive PHY driver" +config PHY_STARFIVE_JH7110_PCIE + bool "Starfive JH7110 PCIe 2.0 PHY driver" + select PHY + help + Enable this to support the Starfive PCIE 2.0/USB 3.0 PHY. + config PHY_STARFIVE_JH7110_USB2 bool "Starfive JH7110 USB 2.0 PHY driver" select PHY diff --git a/drivers/phy/starfive/Makefile b/drivers/phy/starfive/Makefile index a405a75e34..82f25aa21b 100644 --- a/drivers/phy/starfive/Makefile +++ b/drivers/phy/starfive/Makefile @@ -3,4 +3,5 @@ # Copyright (C) 2023 Starfive # +obj-$(CONFIG_PHY_STARFIVE_JH7110_PCIE) += phy-jh7110-pcie.o obj-$(CONFIG_PHY_STARFIVE_JH7110_USB2) += phy-jh7110-usb2.o diff --git a/drivers/phy/starfive/phy-jh7110-pcie.c b/drivers/phy/starfive/phy-jh7110-pcie.c new file mode 100644 index 0000000000..e875d6e0f4 --- /dev/null +++ b/drivers/phy/starfive/phy-jh7110-pcie.c @@ -0,0 +1,211 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * StarFive JH7110 PCIe 2.0 PHY driver + * + * Copyright (C) 2023 StarFive Technology Co., Ltd. + * Author: Minda Chen <[email protected]> + */ +#include <asm/io.h> +#include <dm.h> +#include <dm/device_compat.h> +#include <errno.h> +#include <generic-phy.h> +#include <regmap.h> +#include <soc.h> +#include <syscon.h> +#include <linux/bitops.h> +#include <linux/err.h> + +#define PCIE_KVCO_LEVEL_OFF 0x28 +#define PCIE_USB3_PHY_PLL_CTL_OFF 0x7c +#define PCIE_KVCO_TUNE_SIGNAL_OFF 0x80 +#define PCIE_USB3_PHY_ENABLE BIT(4) +#define PHY_KVCO_FINE_TUNE_LEVEL 0x91 +#define PHY_KVCO_FINE_TUNE_SIGNALS 0xc + +#define USB_PDRSTN_SPLIT BIT(17) + +#define PCIE_PHY_MODE BIT(20) +#define PCIE_PHY_MODE_MASK GENMASK(21, 20) +#define PCIE_USB3_BUS_WIDTH_MASK GENMASK(3, 2) +#define PCIE_USB3_BUS_WIDTH BIT(3) +#define PCIE_USB3_RATE_MASK GENMASK(6, 5) +#define PCIE_USB3_RX_STANDBY_MASK BIT(7) +#define PCIE_USB3_PHY_ENABLE BIT(4) + +struct jh7110_pcie_phy { + struct phy *phy; + struct regmap *stg_syscon; + struct regmap *sys_syscon; + void __iomem *regs; + u32 sys_phy_connect; + u32 stg_pcie_mode; + u32 stg_pcie_usb; + enum phy_mode mode; +}; + +static int phy_usb3_mode_set(struct jh7110_pcie_phy *data) +{ + if (!data->stg_syscon || !data->sys_syscon) { + dev_err(data->phy->dev, "doesn't support usb3 mode\n"); + return -EINVAL; + } + + regmap_update_bits(data->stg_syscon, data->stg_pcie_mode, + PCIE_PHY_MODE_MASK, PCIE_PHY_MODE); + regmap_update_bits(data->stg_syscon, data->stg_pcie_usb, + PCIE_USB3_BUS_WIDTH_MASK, 0); + regmap_update_bits(data->stg_syscon, data->stg_pcie_usb, + PCIE_USB3_PHY_ENABLE, PCIE_USB3_PHY_ENABLE); + + /* Connect usb 3.0 phy mode */ + regmap_update_bits(data->sys_syscon, data->sys_phy_connect, + USB_PDRSTN_SPLIT, 0); + + /* Configuare spread-spectrum mode: down-spread-spectrum */ + writel(PCIE_USB3_PHY_ENABLE, data->regs + PCIE_USB3_PHY_PLL_CTL_OFF); + + return 0; +} + +static void phy_pcie_mode_set(struct jh7110_pcie_phy *data) +{ + u32 val; + + /* default is PCIe mode */ + if (!data->stg_syscon || !data->sys_syscon) + return; + + regmap_update_bits(data->stg_syscon, data->stg_pcie_mode, + PCIE_PHY_MODE_MASK, 0); + regmap_update_bits(data->stg_syscon, data->stg_pcie_usb, + PCIE_USB3_BUS_WIDTH_MASK, + PCIE_USB3_BUS_WIDTH); + regmap_update_bits(data->stg_syscon, data->stg_pcie_usb, + PCIE_USB3_PHY_ENABLE, 0); + + regmap_update_bits(data->sys_syscon, data->sys_phy_connect, + USB_PDRSTN_SPLIT, 0); + + val = readl(data->regs + PCIE_USB3_PHY_PLL_CTL_OFF); + val &= ~PCIE_USB3_PHY_ENABLE; + writel(val, data->regs + PCIE_USB3_PHY_PLL_CTL_OFF); +} + +static void phy_kvco_gain_set(struct jh7110_pcie_phy *phy) +{ + /* PCIe Multi-PHY PLL KVCO Gain fine tune settings: */ + writel(PHY_KVCO_FINE_TUNE_LEVEL, phy->regs + PCIE_KVCO_LEVEL_OFF); + writel(PHY_KVCO_FINE_TUNE_SIGNALS, phy->regs + PCIE_KVCO_TUNE_SIGNAL_OFF); +} + +static int jh7110_pcie_phy_set_mode(struct phy *_phy, + enum phy_mode mode, int submode) +{ + struct udevice *dev = _phy->dev; + struct jh7110_pcie_phy *phy = dev_get_priv(dev); + int ret; + + if (mode == phy->mode) + return 0; + + switch (mode) { + case PHY_MODE_USB_HOST: + case PHY_MODE_USB_DEVICE: + case PHY_MODE_USB_OTG: + ret = phy_usb3_mode_set(phy); + if (ret) + return ret; + break; + case PHY_MODE_PCIE: + phy_pcie_mode_set(phy); + break; + default: + return -EINVAL; + } + + dev_dbg(_phy->dev, "Changing phy mode to %d\n", mode); + phy->mode = mode; + + return 0; +} + +static const struct phy_ops jh7110_pcie_phy_ops = { + .set_mode = jh7110_pcie_phy_set_mode, +}; + +static int starfive_pcie_phy_get_syscon(struct udevice *dev) +{ + struct jh7110_pcie_phy *phy = dev_get_priv(dev); + struct ofnode_phandle_args sys_phandle, stg_phandle; + int ret; + + /* get corresponding syscon phandle */ + ret = dev_read_phandle_with_args(dev, "starfive,sys-syscon", NULL, 1, 0, + &sys_phandle); + + if (ret < 0) { + dev_err(dev, "Can't get sys cfg phandle: %d\n", ret); + return ret; + } + + ret = dev_read_phandle_with_args(dev, "starfive,stg-syscon", NULL, 2, 0, + &stg_phandle); + + if (ret < 0) { + dev_err(dev, "Can't get stg cfg phandle: %d\n", ret); + return ret; + } + + phy->sys_syscon = syscon_node_to_regmap(sys_phandle.node); + if (!IS_ERR_OR_NULL(phy->sys_syscon)) { + /* get syscon register offset */ + phy->sys_phy_connect = sys_phandle.args[0]; + } else { + phy->sys_syscon = NULL; + } + + phy->stg_syscon = syscon_node_to_regmap(stg_phandle.node); + if (!IS_ERR_OR_NULL(phy->stg_syscon)) { + phy->stg_pcie_mode = stg_phandle.args[0]; + phy->stg_pcie_usb = stg_phandle.args[1]; + } else { + phy->stg_syscon = NULL; + } + + return 0; +} + +int jh7110_pcie_phy_probe(struct udevice *dev) +{ + struct jh7110_pcie_phy *phy = dev_get_priv(dev); + int rc; + + phy->regs = dev_read_addr_ptr(dev); + + if (!phy->regs) + return -EINVAL; + + rc = starfive_pcie_phy_get_syscon(dev); + if (rc) + return rc; + + phy_kvco_gain_set(phy); + + return 0; +} + +static const struct udevice_id jh7110_pcie_phy[] = { + { .compatible = "starfive,jh7110-pcie-phy"}, + {}, +}; + +U_BOOT_DRIVER(jh7110_pcie_phy) = { + .name = "jh7110_pcie_phy", + .id = UCLASS_PHY, + .of_match = jh7110_pcie_phy, + .probe = jh7110_pcie_phy_probe, + .ops = &jh7110_pcie_phy_ops, + .priv_auto = sizeof(struct jh7110_pcie_phy), +}; + -- 2.17.1
