[PATCH v4 3/7] phy: starfive: add JH7110 USB 2.0 PHY driver.

Minda Chen
2023-04-06T01:52:44Z

Add Starfive JH7110 SoC USB 2.0 PHY driver support.
USB 2.0 PHY default connect to Cadence USB controller.

Signed-off-by: Minda Chen <minda.chen@starfivetech.com>
---
MAINTAINERS | 7 ++
drivers/phy/starfive/Kconfig | 11 ++
drivers/phy/starfive/Makefile | 1 +
drivers/phy/starfive/phy-jh7110-usb.c | 161 ++++++++++++++++++++++++++
4 files changed, 180 insertions(+)
create mode 100644 drivers/phy/starfive/phy-jh7110-usb.c

diff --git a/MAINTAINERS b/MAINTAINERS
index 1aef5ba46d71..9da352084403 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -19968,6 +19968,13 @@ M: William Qiu <william.qiu@starfivetech.com>
S: Supported
F: Documentation/devicetree/bindings/soc/starfive/starfive,jh7110-syscon.yaml

+STARFIVE JH71X0 USB PHY DRIVER
+M: Emil Renner Berthing <kernel@esmil.dk>
+M: Minda Chen <minda.chen@starfivetech.com>
+S: Supported
+F: Documentation/devicetree/bindings/phy/starfive,jh7110-usb-phy.yaml
+F: drivers/phy/starfive/phy-jh7110-usb.c
+
STATIC BRANCH/CALL
M: Peter Zijlstra <peterz@infradead.org>
M: Josh Poimboeuf <jpoimboe@kernel.org>
diff --git a/drivers/phy/starfive/Kconfig b/drivers/phy/starfive/Kconfig
index f989b8ff8bcb..2c013c390dee 100644
--- a/drivers/phy/starfive/Kconfig
+++ b/drivers/phy/starfive/Kconfig
@@ -11,3 +11,14 @@ config PHY_STARFIVE_DPHY_RX
Choose this option if you have a StarFive D-PHY in your
system. If M is selected, the module will be called
phy-starfive-dphy-rx.
+
+config PHY_STARFIVE_JH7110_USB
+ tristate "Starfive JH7110 USB 2.0 PHY support"
+ depends on USB_SUPPORT
+ select GENERIC_PHY
+ select USB_PHY
+ help
+ Enable this to support the StarFive USB 2.0 PHY,
+ used with the Cadence USB controller.
+ If M is selected, the module will be called
+ phy-jh7110-usb.ko.
diff --git a/drivers/phy/starfive/Makefile b/drivers/phy/starfive/Makefile
index 7ec576cb30ae..176443852f4d 100644
--- a/drivers/phy/starfive/Makefile
+++ b/drivers/phy/starfive/Makefile
@@ -1,2 +1,3 @@
# SPDX-License-Identifier: GPL-2.0
obj-$(CONFIG_PHY_STARFIVE_DPHY_RX) += phy-starfive-dphy-rx.o
+obj-$(CONFIG_PHY_STARFIVE_JH7110_USB) += phy-jh7110-usb.o
diff --git a/drivers/phy/starfive/phy-jh7110-usb.c b/drivers/phy/starfive/phy-jh7110-usb.c
new file mode 100644
index 000000000000..fe2cec39e5d3
--- /dev/null
+++ b/drivers/phy/starfive/phy-jh7110-usb.c
@@ -0,0 +1,161 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * StarFive JH7110 USB 2.0 PHY driver
+ *
+ * Copyright (C) 2023 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_125;
+ enum phy_mode mode;
+};
+
+static void jh7110_usb2_mode_set(struct jh7110_usb2_phy *phy)
+{
+ unsigned int val;
+
+ if (phy->mode != PHY_MODE_USB_HOST) {
+ /* Enable the LS speed keep-alive signal */
+ val = readl(phy->regs + USB_LS_KEEPALIVE_OFF);
+ val |= USB_LS_KEEPALIVE_ENABLE;
+ writel(val, phy->regs + USB_LS_KEEPALIVE_OFF);
+ }
+}
+
+static int jh7110_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_info(&_phy->dev, "Changing phy to %d\n", mode);
+ phy->mode = mode;
+ jh7110_usb2_mode_set(phy);
+ }
+
+ 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_125);
+ 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_125);
+
+ return 0;
+}
+
+static const struct phy_ops jh7110_usb2_phy_ops = {
+ .init = jh7110_usb2_phy_init,
+ .exit = jh7110_usb2_phy_exit,
+ .set_mode = jh7110_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_125 = devm_clk_get(dev, "app_125");
+ if (IS_ERR(phy->app_125))
+ return dev_err_probe(dev, PTR_ERR(phy->app_125),
+ "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");
+
+ platform_set_drvdata(pdev, phy);
+ 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 int jh7110_usb_phy_remove(struct platform_device *pdev)
+{
+ struct jh7110_usb2_phy *phy = platform_get_drvdata(pdev);
+
+ clk_disable_unprepare(phy->app_125);
+ platform_set_drvdata(pdev, NULL);
+
+ return 0;
+}
+
+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,
+ .remove = jh7110_usb_phy_remove,
+ .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");
--
2.17.1