// SPDX-License-Identifier: GPL-2.0/* * phy-google-usb.c - Google USB PHY driver * * Copyright (C) 2025, Google LLC */ #include <linux/bitfield.h>#include <linux/cleanup.h>#include <linux/clk.h>#include <linux/io.h>#include <linux/kernel.h>#include <linux/mfd/syscon.h>#include <linux/module.h>#include <linux/mutex.h>#include <linux/of.h>#include <linux/phy/phy.h>#include <linux/platform_device.h>#include <linux/regmap.h>#include <linux/reset.h>#include <linux/usb/typec_mux.h> #define USBCS_USB2PHY_CFG19_OFFSET 0x0#define USBCS_USB2PHY_CFG19_PHY_CFG_PLL_FB_DIV GENMASK(19, 8) #define USBCS_USB2PHY_CFG21_OFFSET 0x8#define USBCS_USB2PHY_CFG21_PHY_ENABLE BIT(12)#define USBCS_USB2PHY_CFG21_REF_FREQ_SEL GENMASK(15, 13)#define USBCS_USB2PHY_CFG21_PHY_TX_DIG_BYPASS_SEL BIT(19) #define USBCS_PHY_CFG1_OFFSET 0x28#define USBCS_PHY_CFG1_SYS_VBUSVALID BIT(17) enum google_usb_phy_id {	GOOGLE_USB2_PHY,	GOOGLE_USB_PHY_NUM,}; struct google_usb_phy_instance {	struct google_usb_phy *parent;	unsigned int index;	struct phy *phy;	unsigned int num_clks;	struct clk_bulk_data *clks;	unsigned int num_rsts;	struct reset_control_bulk_data *rsts;}; struct google_usb_phy {	struct device *dev;	struct regmap *usb_cfg_regmap;	unsigned int usb2_cfg_offset;	void __iomem *usbdp_top_base;	struct google_usb_phy_instance *insts;	/*	 * Protect phy registers from concurrent access, specifically via	 * google_usb_set_orientation callback.	 */	struct mutex phy_mutex;	struct typec_switch_dev *sw;	enum typec_orientation orientation;}; static void set_vbus_valid(struct google_usb_phy *gphy){	u32 reg; 	if (gphy->orientation == TYPEC_ORIENTATION_NONE) {		reg = readl(gphy->usbdp_top_base + USBCS_PHY_CFG1_OFFSET);		reg &= ~USBCS_PHY_CFG1_SYS_VBUSVALID;		writel(reg, gphy->usbdp_top_base + USBCS_PHY_CFG1_OFFSET);	} else {		reg = readl(gphy->usbdp_top_base + USBCS_PHY_CFG1_OFFSET);		reg |= USBCS_PHY_CFG1_SYS_VBUSVALID;		writel(reg, gphy->usbdp_top_base + USBCS_PHY_CFG1_OFFSET);	}} static int google_usb_set_orientation(struct typec_switch_dev *sw,				      enum typec_orientation orientation){	struct google_usb_phy *gphy = typec_switch_get_drvdata(sw); 	dev_dbg(gphy->dev, "set orientation %d\n", orientation); 	gphy->orientation = orientation; 	if (pm_runtime_suspended(gphy->dev))		return 0; 	guard(mutex)(&gphy->phy_mutex); 	set_vbus_valid(gphy); 	return 0;} static int google_usb2_phy_init(struct phy *_phy){	struct google_usb_phy_instance *inst = phy_get_drvdata(_phy);	struct google_usb_phy *gphy = inst->parent;	u32 reg;	int ret; 	dev_dbg(gphy->dev, "initializing usb2 phy\n"); 	guard(mutex)(&gphy->phy_mutex); 	regmap_read(gphy->usb_cfg_regmap, gphy->usb2_cfg_offset + USBCS_USB2PHY_CFG21_OFFSET, &reg);	reg &= ~USBCS_USB2PHY_CFG21_PHY_TX_DIG_BYPASS_SEL;	reg &= ~USBCS_USB2PHY_CFG21_REF_FREQ_SEL;	reg |= FIELD_PREP(USBCS_USB2PHY_CFG21_REF_FREQ_SEL, 0);	regmap_write(gphy->usb_cfg_regmap, gphy->usb2_cfg_offset + USBCS_USB2PHY_CFG21_OFFSET, reg); 	regmap_read(gphy->usb_cfg_regmap, gphy->usb2_cfg_offset + USBCS_USB2PHY_CFG19_OFFSET, &reg);	reg &= ~USBCS_USB2PHY_CFG19_PHY_CFG_PLL_FB_DIV;	reg |= FIELD_PREP(USBCS_USB2PHY_CFG19_PHY_CFG_PLL_FB_DIV, 368);	regmap_write(gphy->usb_cfg_regmap, gphy->usb2_cfg_offset + USBCS_USB2PHY_CFG19_OFFSET, reg); 	set_vbus_valid(gphy); 	ret = clk_bulk_prepare_enable(inst->num_clks, inst->clks);	if (ret)		return ret; 	ret = reset_control_bulk_deassert(inst->num_rsts, inst->rsts);	if (ret) {		clk_bulk_disable_unprepare(inst->num_clks, inst->clks);		return ret;	} 	regmap_read(gphy->usb_cfg_regmap, gphy->usb2_cfg_offset + USBCS_USB2PHY_CFG21_OFFSET, &reg);	reg |= USBCS_USB2PHY_CFG21_PHY_ENABLE;	regmap_write(gphy->usb_cfg_regmap, gphy->usb2_cfg_offset + USBCS_USB2PHY_CFG21_OFFSET, reg); 	return 0;} static int google_usb2_phy_exit(struct phy *_phy){	struct google_usb_phy_instance *inst = phy_get_drvdata(_phy);	struct google_usb_phy *gphy = inst->parent;	u32 reg; 	dev_dbg(gphy->dev, "exiting usb2 phy\n"); 	guard(mutex)(&gphy->phy_mutex); 	regmap_read(gphy->usb_cfg_regmap, gphy->usb2_cfg_offset + USBCS_USB2PHY_CFG21_OFFSET, &reg);	reg &= ~USBCS_USB2PHY_CFG21_PHY_ENABLE;	regmap_write(gphy->usb_cfg_regmap, gphy->usb2_cfg_offset + USBCS_USB2PHY_CFG21_OFFSET, reg); 	reset_control_bulk_assert(inst->num_rsts, inst->rsts);	clk_bulk_disable_unprepare(inst->num_clks, inst->clks); 	return 0;} static const struct phy_ops google_usb2_phy_ops = {	.init		= google_usb2_phy_init,	.exit		= google_usb2_phy_exit,}; static struct phy *google_usb_phy_xlate(struct device *dev,					const struct of_phandle_args *args){	struct google_usb_phy *gphy = dev_get_drvdata(dev); 	if (args->args[0] >= GOOGLE_USB_PHY_NUM) {		dev_err(dev, "invalid PHY index requested from DT\n");		return ERR_PTR(-ENODEV);	}	return gphy->insts[args->args[0]].phy;} static int google_usb_phy_probe(struct platform_device *pdev){	struct typec_switch_desc sw_desc = { };	struct google_usb_phy_instance *inst;	struct phy_provider *phy_provider;	struct device *dev = &pdev->dev;	struct google_usb_phy *gphy;	struct phy *phy;	u32 args[1];	int ret; 	gphy = devm_kzalloc(dev, sizeof(*gphy), GFP_KERNEL);	if (!gphy)		return -ENOMEM; 	dev_set_drvdata(dev, gphy);	gphy->dev = dev; 	ret = devm_mutex_init(dev, &gphy->phy_mutex);	if (ret)		return ret; 	gphy->usb_cfg_regmap =		syscon_regmap_lookup_by_phandle_args(dev->of_node,						     "google,usb-cfg-csr",						     ARRAY_SIZE(args), args);	if (IS_ERR(gphy->usb_cfg_regmap)) {		return dev_err_probe(dev, PTR_ERR(gphy->usb_cfg_regmap),				     "invalid usb cfg csr\n");	} 	gphy->usb2_cfg_offset = args[0]; 	gphy->usbdp_top_base = devm_platform_ioremap_resource_byname(pdev,								     "usbdp_top");	if (IS_ERR(gphy->usbdp_top_base))		return dev_err_probe(dev, PTR_ERR(gphy->usbdp_top_base),				    "invalid usbdp top\n"); 	gphy->insts = devm_kcalloc(dev, GOOGLE_USB_PHY_NUM, sizeof(*gphy->insts), GFP_KERNEL);	if (!gphy->insts)		return -ENOMEM; 	inst = &gphy->insts[GOOGLE_USB2_PHY];	inst->parent = gphy;	inst->index = GOOGLE_USB2_PHY;	phy = devm_phy_create(dev, NULL, &google_usb2_phy_ops);	if (IS_ERR(phy))		return dev_err_probe(dev, PTR_ERR(phy),				     "failed to create usb2 phy instance\n");	inst->phy = phy;	phy_set_drvdata(phy, inst); 	inst->num_clks = 2;	inst->clks = devm_kcalloc(dev, inst->num_clks, sizeof(*inst->clks), GFP_KERNEL);	if (!inst->clks)		return -ENOMEM;	inst->clks[0].id = "usb2";	inst->clks[1].id = "usb2_apb";	ret = devm_clk_bulk_get(dev, inst->num_clks, inst->clks);	if (ret)		return dev_err_probe(dev, ret, "failed to get u2 phy clks\n"); 	inst->num_rsts = 2;	inst->rsts = devm_kcalloc(dev, inst->num_rsts, sizeof(*inst->rsts), GFP_KERNEL);	if (!inst->rsts)		return -ENOMEM;	inst->rsts[0].id = "usb2";	inst->rsts[1].id = "usb2_apb";	ret = devm_reset_control_bulk_get_exclusive(dev, inst->num_rsts, inst->rsts);	if (ret)		return dev_err_probe(dev, ret, "failed to get u2 phy resets\n"); 	phy_provider = devm_of_phy_provider_register(dev, google_usb_phy_xlate);	if (IS_ERR(phy_provider))		return dev_err_probe(dev, PTR_ERR(phy_provider),				     "failed to register phy provider\n"); 	pm_runtime_enable(dev); 	sw_desc.fwnode = dev_fwnode(dev);	sw_desc.drvdata = gphy;	sw_desc.name = fwnode_get_name(dev_fwnode(dev));	sw_desc.set = google_usb_set_orientation; 	gphy->sw = typec_switch_register(dev, &sw_desc);	if (IS_ERR(gphy->sw))		return dev_err_probe(dev, PTR_ERR(gphy->sw),				     "failed to register typec switch\n"); 	return 0;} static void google_usb_phy_remove(struct platform_device *pdev){	struct google_usb_phy *gphy = dev_get_drvdata(&pdev->dev); 	typec_switch_unregister(gphy->sw);	pm_runtime_disable(&pdev->dev);} static const struct of_device_id google_usb_phy_of_match[] = {	{		.compatible = "google,lga-usb-phy",	},	{ }};MODULE_DEVICE_TABLE(of, google_usb_phy_of_match); static struct platform_driver google_usb_phy = {	.probe	= google_usb_phy_probe,	.remove = google_usb_phy_remove,	.driver = {		.name		= "google-usb-phy",		.of_match_table	= google_usb_phy_of_match,	}}; module_platform_driver(google_usb_phy);MODULE_LICENSE("GPL");MODULE_DESCRIPTION("Google USB phy driver");