Add USB 2.0 PHY driver for Sophgo CV18XX/SG200X. Signed-off-by: Inochi Amaoto <inochiama@xxxxxxxxxxx> --- drivers/phy/Kconfig | 1 + drivers/phy/Makefile | 1 + drivers/phy/sophgo/Kconfig | 19 ++ drivers/phy/sophgo/Makefile | 2 + drivers/phy/sophgo/phy-cv1800-usb.c | 381 ++++++++++++++++++++++++++++ 5 files changed, 404 insertions(+) create mode 100644 drivers/phy/sophgo/Kconfig create mode 100644 drivers/phy/sophgo/Makefile create mode 100644 drivers/phy/sophgo/phy-cv1800-usb.c diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig index 787354b849c7..596b37ab3191 100644 --- a/drivers/phy/Kconfig +++ b/drivers/phy/Kconfig @@ -92,6 +92,7 @@ source "drivers/phy/renesas/Kconfig" source "drivers/phy/rockchip/Kconfig" source "drivers/phy/samsung/Kconfig" source "drivers/phy/socionext/Kconfig" +source "drivers/phy/sophgo/Kconfig" source "drivers/phy/st/Kconfig" source "drivers/phy/starfive/Kconfig" source "drivers/phy/sunplus/Kconfig" diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile index 868a220ed0f6..7ff32f0ae08a 100644 --- a/drivers/phy/Makefile +++ b/drivers/phy/Makefile @@ -31,6 +31,7 @@ obj-y += allwinner/ \ rockchip/ \ samsung/ \ socionext/ \ + sophgo/ \ st/ \ starfive/ \ sunplus/ \ diff --git a/drivers/phy/sophgo/Kconfig b/drivers/phy/sophgo/Kconfig new file mode 100644 index 000000000000..b1c558de6616 --- /dev/null +++ b/drivers/phy/sophgo/Kconfig @@ -0,0 +1,19 @@ +# SPDX-License-Identifier: GPL-2.0-only +# +# Phy drivers for Sophgo platforms +# + +if ARCH_SOPHGO || COMPILE_TEST + +config PHY_SOPHGO_CV1800_USB + tristate "Sophgo CV18XX/SG200X USB 2.0 PHY support" + depends on MFD_SYSCON + depends on USB_SUPPORT + select GENERIC_PHY + help + Enable this to support the USB 2.0 PHY used with + the DWC2 USB controller in Sophgo CV18XX/SG200X + series SoC. + If unsure, say N. + +endif # ARCH_SOPHGO || COMPILE_TEST diff --git a/drivers/phy/sophgo/Makefile b/drivers/phy/sophgo/Makefile new file mode 100644 index 000000000000..659537054cd4 --- /dev/null +++ b/drivers/phy/sophgo/Makefile @@ -0,0 +1,2 @@ +# SPDX-License-Identifier: GPL-2.0 +obj-$(CONFIG_PHY_SOPHGO_CV1800_USB) += phy-cv1800-usb.o diff --git a/drivers/phy/sophgo/phy-cv1800-usb.c b/drivers/phy/sophgo/phy-cv1800-usb.c new file mode 100644 index 000000000000..a9c7f41406b4 --- /dev/null +++ b/drivers/phy/sophgo/phy-cv1800-usb.c @@ -0,0 +1,381 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2024 Inochi Amaoto <inochiama@xxxxxxxxxxx> + */ + +#include <linux/clk.h> +#include <linux/delay.h> +#include <linux/debugfs.h> +#include <linux/gpio/consumer.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> +#include <soc/sophgo/cv1800-sysctl.h> + +#define PHY_IDPAD_C_OW BIT(6) +#define PHY_IDPAD_C_SW BIT(7) + +#define PHY_BASE_CLK_RATE 300000000 +#define PHY_APP_CLK_RATE 125000000 +#define PHY_LPM_CLK_RATE 12000000 +#define PHY_STB_CLK_RATE 333334 + +#define PHY_VBUS_DET_DEBOUNCE_TIME usecs_to_jiffies(100) + +struct cv1800_usb_phy { + struct phy *phy; + struct regmap *syscon; + spinlock_t lock; + struct clk *usb_phy_clk; + struct clk *usb_app_clk; + struct clk *usb_lpm_clk; + struct clk *usb_stb_clk; + struct gpio_descs *switch_gpios; + struct gpio_desc *vbus_det_gpio; + int vbus_det_irq; + struct delayed_work vbus_work; + bool enable_otg; +}; + +static int cv1800_usb_phy_set_idpad(struct cv1800_usb_phy *phy, + bool is_host) +{ + unsigned long flags; + unsigned int regval = 0; + int ret; + + if (is_host) + regval = PHY_IDPAD_C_OW; + else + regval = PHY_IDPAD_C_OW | PHY_IDPAD_C_SW; + + spin_lock_irqsave(&phy->lock, flags); + ret = regmap_update_bits(phy->syscon, CV1800_USB_PHY_CTRL_REG, + PHY_IDPAD_C_OW | PHY_IDPAD_C_SW, + regval); + spin_unlock_irqrestore(&phy->lock, flags); + + return ret; +} + +static void cv1800_usb_phy_set_gpio(struct cv1800_usb_phy *phy, + bool is_host) +{ + unsigned int i, ndescs; + struct gpio_desc **gpios; + + if (!phy->switch_gpios) + return; + + ndescs = phy->switch_gpios->ndescs; + gpios = phy->switch_gpios->desc; + + if (is_host) { + for (i = 0; i < ndescs; i++) + gpiod_set_value_cansleep(gpios[i], 0); + } else { + for (i = 0; i < ndescs; i++) + gpiod_set_value_cansleep(gpios[ndescs - 1 - i], 1); + } +} + +static int cv1800_usb_phy_set_mode_internal(struct cv1800_usb_phy *phy, + bool is_host) +{ + int ret = cv1800_usb_phy_set_idpad(phy, is_host); + + if (ret < 0) + return ret; + + cv1800_usb_phy_set_gpio(phy, is_host); + + return 0; +} + +static ssize_t dr_mode_write(struct file *file, const char __user *_buf, + size_t count, loff_t *ppos) +{ + struct seq_file *seq = file->private_data; + struct cv1800_usb_phy *phy = seq->private; + bool is_host; + char buf[16]; + + if (copy_from_user(&buf, _buf, min_t(size_t, sizeof(buf) - 1, count))) + return -EFAULT; + + if (sysfs_streq(buf, "host")) { + phy->enable_otg = false; + is_host = true; + } else if (sysfs_streq(buf, "peripheral")) { + phy->enable_otg = false; + is_host = false; + } else if (sysfs_streq(buf, "otg") && phy->vbus_det_irq > 0) { + phy->enable_otg = true; + } else + return -EINVAL; + + if (phy->enable_otg) + queue_delayed_work(system_wq, &phy->vbus_work, + PHY_VBUS_DET_DEBOUNCE_TIME); + else + cv1800_usb_phy_set_mode_internal(phy, is_host); + + return count; +} + +static int dr_mode_show(struct seq_file *seq, void *v) +{ + struct cv1800_usb_phy *phy = seq->private; + unsigned long flags; + unsigned int regval; + bool is_host = true; + int ret; + + spin_lock_irqsave(&phy->lock, flags); + ret = regmap_read(phy->syscon, CV1800_USB_PHY_CTRL_REG, ®val); + spin_unlock_irqrestore(&phy->lock, flags); + + if (ret) + return ret; + + if (regval & PHY_IDPAD_C_SW) + is_host = false; + + if (phy->enable_otg) + seq_puts(seq, "otg: "); + seq_puts(seq, is_host ? "host\n" : "peripheral\n"); + + return 0; +} + +DEFINE_SHOW_STORE_ATTRIBUTE(dr_mode); + +static int cv1800_usb_phy_set_clock(struct cv1800_usb_phy *phy) +{ + int ret; + + ret = clk_set_rate(phy->usb_phy_clk, PHY_BASE_CLK_RATE); + if (ret) + return 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; + + ret = clk_set_rate(phy->usb_stb_clk, PHY_STB_CLK_RATE); + if (ret) + return ret; + + return 0; +} + +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); + bool is_host; + + switch (mode) { + case PHY_MODE_USB_DEVICE: + is_host = false; + phy->enable_otg = false; + break; + case PHY_MODE_USB_HOST: + is_host = true; + phy->enable_otg = false; + break; + case PHY_MODE_USB_OTG: + /* phy only supports soft OTG when VBUS_DET pin is connected. */ + if (phy->vbus_det_irq > 0) { + phy->enable_otg = true; + queue_delayed_work(system_wq, &phy->vbus_work, + PHY_VBUS_DET_DEBOUNCE_TIME); + } + return 0; + default: + return -EINVAL; + } + + return cv1800_usb_phy_set_mode_internal(phy, is_host); +} + +static const struct phy_ops cv1800_usb_phy_ops = { + .set_mode = cv1800_usb_phy_set_mode, + .owner = THIS_MODULE, +}; + +static void cv1800_usb_phy_vbus_switch(struct work_struct *work) +{ + struct cv1800_usb_phy *phy = + container_of(work, struct cv1800_usb_phy, vbus_work.work); + int state = gpiod_get_value_cansleep(phy->vbus_det_gpio); + + cv1800_usb_phy_set_mode_internal(phy, state == 0); +} + +static irqreturn_t cv1800_usb_phy_vbus_det_irq(int irq, void *dev_id) +{ + struct cv1800_usb_phy *phy = dev_id; + + if (phy->enable_otg) + queue_delayed_work(system_wq, &phy->vbus_work, + PHY_VBUS_DET_DEBOUNCE_TIME); + return IRQ_HANDLED; +} + +static void cv1800_usb_phy_init_mode(struct device *dev, + struct cv1800_usb_phy *phy) +{ + const char *mode; + bool is_host; + + phy->enable_otg = false; + + device_property_read_string(dev, "dr_mode", &mode); + if (!mode) + mode = "host"; + + if (!strcmp(mode, "host")) + is_host = true; + else if (!strcmp(mode, "peripheral")) + is_host = false; + else if (phy->vbus_det_irq > 0) + phy->enable_otg = true; + + if (phy->enable_otg) + queue_delayed_work(system_wq, &phy->vbus_work, 0); + else + cv1800_usb_phy_set_mode_internal(phy, is_host); +} + +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; + + spin_lock_init(&phy->lock); + + phy->usb_phy_clk = devm_clk_get_enabled(dev, "phy"); + if (IS_ERR(phy->usb_phy_clk)) + return dev_err_probe(dev, PTR_ERR(phy->usb_phy_clk), + "Failed to get phy clock\n"); + + 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->switch_gpios = devm_gpiod_get_array_optional(dev, "sophgo,switch", + GPIOD_OUT_LOW); + if (IS_ERR(phy->switch_gpios)) + return dev_err_probe(dev, PTR_ERR(phy->switch_gpios), + "Failed to get switch pin\n"); + + phy->vbus_det_gpio = devm_gpiod_get_optional(dev, "vbus_det", GPIOD_IN); + if (IS_ERR(phy->vbus_det_gpio)) + return dev_err_probe(dev, PTR_ERR(phy->vbus_det_gpio), + "Failed to process vbus pin\n"); + + phy->vbus_det_irq = gpiod_to_irq(phy->vbus_det_gpio); + if (phy->vbus_det_irq > 0) { + ret = devm_request_irq(dev, phy->vbus_det_irq, + cv1800_usb_phy_vbus_det_irq, + IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING, + "usb-vbus-det", phy); + if (ret) + return dev_err_probe(dev, ret, + "Failed to request vbus irq\n"); + } + + INIT_DELAYED_WORK(&phy->vbus_work, cv1800_usb_phy_vbus_switch); + + debugfs_create_file("dr_mode", 0644, phy->phy->debugfs, + phy, &dr_mode_fops); + + phy_set_drvdata(phy->phy, phy); + phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate); + + /* + * phy needs to change mode twice after initialization, + * otherwise the controller can not found devices attached + * to the phy. + */ + cv1800_usb_phy_set_idpad(phy, false); + cv1800_usb_phy_set_idpad(phy, true); + cv1800_usb_phy_init_mode(dev, phy); + + return PTR_ERR_OR_ZERO(phy_provider); +} + +static void cv1800_usb_phy_remove(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct cv1800_usb_phy *phy = platform_get_drvdata(pdev); + + if (phy->vbus_det_irq > 0) + devm_free_irq(dev, phy->vbus_det_irq, phy); + + cancel_delayed_work_sync(&phy->vbus_work); +} + +static const struct of_device_id cv1800_usb_phy_ids[] = { + { .compatible = "sophgo,cv1800-usb-phy" }, + { }, +}; +MODULE_DEVICE_TABLE(of, cv1800_usb_phy_ids); + +static struct platform_driver cv1800_usb_phy_driver = { + .probe = cv1800_usb_phy_probe, + .remove_new = cv1800_usb_phy_remove, + .driver = { + .name = "cv1800-usb-phy", + .of_match_table = cv1800_usb_phy_ids, + }, +}; +module_platform_driver(cv1800_usb_phy_driver); +MODULE_DESCRIPTION("CV1800/SG2000 SoC USB 2.0 PHY driver"); +MODULE_LICENSE("GPL"); -- 2.44.0