diff options
Diffstat (limited to 'drivers/phy/sophgo/phy-cv1800-usb2.c')
| -rw-r--r-- | drivers/phy/sophgo/phy-cv1800-usb2.c | 170 |
1 files changed, 170 insertions, 0 deletions
diff --git a/drivers/phy/sophgo/phy-cv1800-usb2.c b/drivers/phy/sophgo/phy-cv1800-usb2.c new file mode 100644 index 000000000000..64f8e37b4b52 --- /dev/null +++ b/drivers/phy/sophgo/phy-cv1800-usb2.c @@ -0,0 +1,170 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2025 Inochi Amaoto <inochiama@outlook.com> + */ + +#include <linux/clk.h> +#include <linux/bitfield.h> +#include <linux/debugfs.h> +#include <linux/kernel.h> +#include <linux/mfd/syscon.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/of_address.h> +#include <linux/of_gpio.h> +#include <linux/platform_device.h> +#include <linux/phy/phy.h> +#include <linux/regmap.h> +#include <linux/spinlock.h> + +#define REG_USB_PHY_CTRL 0x048 + +#define PHY_VBUS_POWER_EN BIT(0) +#define PHY_VBUS_POWER BIT(1) +#define PHY_ID_OVERWRITE_EN BIT(6) +#define PHY_ID_OVERWRITE_MODE BIT(7) +#define PHY_ID_OVERWRITE_MODE_HOST FIELD_PREP(BIT(7), 0) +#define PHY_ID_OVERWRITE_MODE_DEVICE FIELD_PREP(BIT(7), 1) + +#define PHY_APP_CLK_RATE 125000000 +#define PHY_LPM_CLK_RATE 12000000 +#define PHY_STB_CLK_RATE 333334 + +struct cv1800_usb_phy { + struct phy *phy; + struct regmap *syscon; + spinlock_t lock; + struct clk *usb_app_clk; + struct clk *usb_lpm_clk; + struct clk *usb_stb_clk; + bool support_otg; +}; + +static int cv1800_usb_phy_set_mode(struct phy *_phy, + enum phy_mode mode, int submode) +{ + struct cv1800_usb_phy *phy = phy_get_drvdata(_phy); + unsigned int regval = 0; + int ret; + + dev_info(&phy->phy->dev, "set mode %d", (int)mode); + + switch (mode) { + case PHY_MODE_USB_DEVICE: + regval = PHY_ID_OVERWRITE_EN | PHY_ID_OVERWRITE_MODE_DEVICE; + regmap_clear_bits(phy->syscon, REG_USB_PHY_CTRL, PHY_VBUS_POWER); + break; + case PHY_MODE_USB_HOST: + regval = PHY_ID_OVERWRITE_EN | PHY_ID_OVERWRITE_MODE_HOST; + regmap_set_bits(phy->syscon, REG_USB_PHY_CTRL, PHY_VBUS_POWER); + break; + case PHY_MODE_USB_OTG: + if (!phy->support_otg) + return 0; + + ret = regmap_read(phy->syscon, REG_USB_PHY_CTRL, ®val); + if (ret) + return ret; + + regval = FIELD_GET(PHY_ID_OVERWRITE_MODE, regval); + break; + default: + return -EINVAL; + } + + return regmap_update_bits(phy->syscon, REG_USB_PHY_CTRL, + PHY_ID_OVERWRITE_EN | PHY_ID_OVERWRITE_MODE, + regval); +} + +static int cv1800_usb_phy_set_clock(struct cv1800_usb_phy *phy) +{ + int ret; + + ret = clk_set_rate(phy->usb_app_clk, PHY_APP_CLK_RATE); + if (ret) + return ret; + + ret = clk_set_rate(phy->usb_lpm_clk, PHY_LPM_CLK_RATE); + if (ret) + return ret; + + return clk_set_rate(phy->usb_stb_clk, PHY_STB_CLK_RATE); +} + +static const struct phy_ops cv1800_usb_phy_ops = { + .set_mode = cv1800_usb_phy_set_mode, + .owner = THIS_MODULE, +}; + +static int cv1800_usb_phy_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct device *parent = dev->parent; + struct cv1800_usb_phy *phy; + struct phy_provider *phy_provider; + int ret; + + if (!parent) + return -ENODEV; + + phy = devm_kmalloc(dev, sizeof(*phy), GFP_KERNEL); + if (!phy) + return -ENOMEM; + + phy->syscon = syscon_node_to_regmap(parent->of_node); + if (IS_ERR_OR_NULL(phy->syscon)) + return -ENODEV; + + phy->support_otg = false; + + spin_lock_init(&phy->lock); + + phy->usb_app_clk = devm_clk_get_enabled(dev, "app"); + if (IS_ERR(phy->usb_app_clk)) + return dev_err_probe(dev, PTR_ERR(phy->usb_app_clk), + "Failed to get app clock\n"); + + phy->usb_lpm_clk = devm_clk_get_enabled(dev, "lpm"); + if (IS_ERR(phy->usb_lpm_clk)) + return dev_err_probe(dev, PTR_ERR(phy->usb_lpm_clk), + "Failed to get lpm clock\n"); + + phy->usb_stb_clk = devm_clk_get_enabled(dev, "stb"); + if (IS_ERR(phy->usb_stb_clk)) + return dev_err_probe(dev, PTR_ERR(phy->usb_stb_clk), + "Failed to get stb clock\n"); + + phy->phy = devm_phy_create(dev, NULL, &cv1800_usb_phy_ops); + if (IS_ERR(phy->phy)) + return dev_err_probe(dev, PTR_ERR(phy->phy), + "Failed to create phy\n"); + + ret = cv1800_usb_phy_set_clock(phy); + if (ret) + return ret; + + 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 cv1800_usb_phy_ids[] = { + { .compatible = "sophgo,cv1800b-usb2-phy" }, + { }, +}; +MODULE_DEVICE_TABLE(of, cv1800_usb_phy_ids); + +static struct platform_driver cv1800_usb_phy_driver = { + .probe = cv1800_usb_phy_probe, + .driver = { + .name = "cv1800-usb2-phy", + .of_match_table = cv1800_usb_phy_ids, + }, +}; +module_platform_driver(cv1800_usb_phy_driver); + +MODULE_AUTHOR("Inochi Amaoto <inochiama@outlook.com>"); +MODULE_DESCRIPTION("CV1800/SG2000 SoC USB 2.0 PHY driver"); +MODULE_LICENSE("GPL"); |