// SPDX-License-Identifier: GPL-2.0+ /* * StarFive JH7110 USB 2.0 PHY driver * * Copyright (C) 2023 StarFive Technology Co., Ltd. * Author: Minda Chen <minda.chen@starfivetech.com> */ #include <linux/bits.h> #include <linux/clk.h> #include <linux/err.h> #include <linux/io.h> #include <linux/module.h> #include <linux/phy/phy.h> #include <linux/platform_device.h> #include <linux/usb/of.h> #define USB_125M_CLK_RATE 125000000 #define USB_LS_KEEPALIVE_OFF 0x4 #define USB_LS_KEEPALIVE_ENABLE BIT(4) struct jh7110_usb2_phy { struct phy *phy; void __iomem *regs; struct clk *usb_125m_clk; struct clk *app_125m; enum phy_mode mode; }; static void usb2_set_ls_keepalive(struct jh7110_usb2_phy *phy, bool set) { unsigned int val; /* Host mode enable the LS speed keep-alive signal */ val = readl(phy->regs + USB_LS_KEEPALIVE_OFF); if (set) val |= USB_LS_KEEPALIVE_ENABLE; else val &= ~USB_LS_KEEPALIVE_ENABLE; writel(val, phy->regs + USB_LS_KEEPALIVE_OFF); } static int usb2_phy_set_mode(struct phy *_phy, enum phy_mode mode, int submode) { struct jh7110_usb2_phy *phy = phy_get_drvdata(_phy); switch (mode) { case PHY_MODE_USB_HOST: case PHY_MODE_USB_DEVICE: case PHY_MODE_USB_OTG: break; default: return -EINVAL; } if (mode != phy->mode) { dev_dbg(&_phy->dev, "Changing phy to %d\n", mode); phy->mode = mode; usb2_set_ls_keepalive(phy, (mode != PHY_MODE_USB_DEVICE)); } return 0; } static int jh7110_usb2_phy_init(struct phy *_phy) { struct jh7110_usb2_phy *phy = phy_get_drvdata(_phy); int ret; ret = clk_set_rate(phy->usb_125m_clk, USB_125M_CLK_RATE); if (ret) return ret; ret = clk_prepare_enable(phy->app_125m); if (ret) return ret; return 0; } static int jh7110_usb2_phy_exit(struct phy *_phy) { struct jh7110_usb2_phy *phy = phy_get_drvdata(_phy); clk_disable_unprepare(phy->app_125m); return 0; } static const struct phy_ops jh7110_usb2_phy_ops = { .init = jh7110_usb2_phy_init, .exit = jh7110_usb2_phy_exit, .set_mode = usb2_phy_set_mode, .owner = THIS_MODULE, }; static int jh7110_usb_phy_probe(struct platform_device *pdev) { struct jh7110_usb2_phy *phy; struct device *dev = &pdev->dev; struct phy_provider *phy_provider; phy = devm_kzalloc(dev, sizeof(*phy), GFP_KERNEL); if (!phy) return -ENOMEM; phy->usb_125m_clk = devm_clk_get(dev, "125m"); if (IS_ERR(phy->usb_125m_clk)) return dev_err_probe(dev, PTR_ERR(phy->usb_125m_clk), "Failed to get 125m clock\n"); phy->app_125m = devm_clk_get(dev, "app_125m"); if (IS_ERR(phy->app_125m)) return dev_err_probe(dev, PTR_ERR(phy->app_125m), "Failed to get app 125m clock\n"); phy->regs = devm_platform_ioremap_resource(pdev, 0); if (IS_ERR(phy->regs)) return dev_err_probe(dev, PTR_ERR(phy->regs), "Failed to map phy base\n"); phy->phy = devm_phy_create(dev, NULL, &jh7110_usb2_phy_ops); if (IS_ERR(phy->phy)) return dev_err_probe(dev, PTR_ERR(phy->phy), "Failed to create phy\n"); phy_set_drvdata(phy->phy, phy); phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate); return PTR_ERR_OR_ZERO(phy_provider); } static const struct of_device_id jh7110_usb_phy_of_match[] = { { .compatible = "starfive,jh7110-usb-phy" }, { /* sentinel */ }, }; MODULE_DEVICE_TABLE(of, jh7110_usb_phy_of_match); static struct platform_driver jh7110_usb_phy_driver = { .probe = jh7110_usb_phy_probe, .driver = { .of_match_table = jh7110_usb_phy_of_match, .name = "jh7110-usb-phy", } }; module_platform_driver(jh7110_usb_phy_driver); MODULE_DESCRIPTION("StarFive JH7110 USB 2.0 PHY driver"); MODULE_AUTHOR("Minda Chen <minda.chen@starfivetech.com>"); MODULE_LICENSE("GPL"
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