[PATCH v4 6/7] usb: cdns3: add StarFive JH7110 USB driver.

[Minda Chen]

Adds Specific Glue layer to support USB peripherals on
StarFive JH7110 SoC.
There is a Cadence USB3 core for JH7110 SoCs, the cdns
core is the child of this USB wrapper module device.

Signed-off-by: Minda Chen <minda.chen@xxxxxxxxxxxxxxxx>
---
 MAINTAINERS                        |   7 +
 drivers/usb/cdns3/Kconfig          |  11 +
 drivers/usb/cdns3/Makefile         |   1 +
 drivers/usb/cdns3/cdns3-starfive.c | 378 +++++++++++++++++++++++++++++
 drivers/usb/cdns3/core.h           |   3 +
 5 files changed, 400 insertions(+)
 create mode 100644 drivers/usb/cdns3/cdns3-starfive.c

diff --git a/MAINTAINERS b/MAINTAINERS
index d98b70d62fd4..0610bbf921bb 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -19977,6 +19977,13 @@ F:	Documentation/devicetree/bindings/phy/starfive,jh7110-usb-phy.yaml
 F:	drivers/phy/starfive/phy-jh7110-pcie.c
 F:	drivers/phy/starfive/phy-jh7110-usb.c
 
+STARFIVE JH71X0 USB DRIVERS
+M:	Emil Renner Berthing <kernel@xxxxxxxx>
+M:	Minda Chen <minda.chen@xxxxxxxxxxxxxxxx>
+S:	Maintained
+F:	Documentation/devicetree/bindings/usb/starfive,jh7110-usb.yaml
+F:	drivers/usb/cdns3/cdns3-starfive.c
+
 STATIC BRANCH/CALL
 M:	Peter Zijlstra <peterz@xxxxxxxxxxxxx>
 M:	Josh Poimboeuf <jpoimboe@xxxxxxxxxx>
diff --git a/drivers/usb/cdns3/Kconfig b/drivers/usb/cdns3/Kconfig
index b98ca0a1352a..0a514b591527 100644
--- a/drivers/usb/cdns3/Kconfig
+++ b/drivers/usb/cdns3/Kconfig
@@ -78,6 +78,17 @@ config USB_CDNS3_IMX
 
 	  For example, imx8qm and imx8qxp.
 
+config USB_CDNS3_STARFIVE
+	tristate "Cadence USB3 support on StarFive SoC platforms"
+	depends on ARCH_STARFIVE || COMPILE_TEST
+	help
+	  Say 'Y' or 'M' here if you are building for StarFive SoCs
+	  platforms that contain Cadence USB3 controller core.
+
+	  e.g. JH7110.
+
+	  If you choose to build this driver as module it will
+	  be dynamically linked and module will be called cdns3-starfive.ko
 endif
 
 if USB_CDNS_SUPPORT
diff --git a/drivers/usb/cdns3/Makefile b/drivers/usb/cdns3/Makefile
index 61edb2f89276..48dfae75b5aa 100644
--- a/drivers/usb/cdns3/Makefile
+++ b/drivers/usb/cdns3/Makefile
@@ -24,6 +24,7 @@ endif
 obj-$(CONFIG_USB_CDNS3_PCI_WRAP)		+= cdns3-pci-wrap.o
 obj-$(CONFIG_USB_CDNS3_TI)			+= cdns3-ti.o
 obj-$(CONFIG_USB_CDNS3_IMX)			+= cdns3-imx.o
+obj-$(CONFIG_USB_CDNS3_STARFIVE)		+= cdns3-starfive.o
 
 cdnsp-udc-pci-y					:= cdnsp-pci.o
 
diff --git a/drivers/usb/cdns3/cdns3-starfive.c b/drivers/usb/cdns3/cdns3-starfive.c
new file mode 100644
index 000000000000..925209a97bf9
--- /dev/null
+++ b/drivers/usb/cdns3/cdns3-starfive.c
@@ -0,0 +1,378 @@
+// SPDX-License-Identifier: GPL-2.0
+/**
+ * cdns3-starfive.c - StarFive specific Glue layer for Cadence USB Controller
+ *
+ * Copyright (C) 2022 Starfive, Inc.
+ * Author:	Yanhong Wang <yanhong.wang@xxxxxxxxxxxxxxxx>
+ * Author:	Mason Huo <mason.huo@xxxxxxxxxxxxxxxx>
+ * Author:	Minda Chen <minda.chen@xxxxxxxxxxxxxxxx>
+ */
+
+#include <linux/bits.h>
+#include <linux/clk.h>
+#include <linux/module.h>
+#include <linux/mfd/syscon.h>
+#include <linux/kernel.h>
+#include <linux/platform_device.h>
+#include <linux/io.h>
+#include <linux/of_platform.h>
+#include <linux/regmap.h>
+#include <linux/reset.h>
+#include <linux/usb/otg.h>
+#include "core.h"
+
+#define USB_STRAP_HOST			BIT(17)
+#define USB_STRAP_DEVICE		BIT(18)
+#define USB_STRAP_MASK			GENMASK(18, 16)
+
+#define USB_SUSPENDM_HOST		BIT(19)
+#define USB_SUSPENDM_MASK		BIT(19)
+#define CDNS_IRQ_WAKEUP_INDEX		3
+
+struct cdns_starfive {
+	struct device *dev;
+	struct phy *usb2_phy;
+	struct phy *usb3_phy;
+	struct regmap *stg_syscon;
+	struct reset_control *resets;
+	struct clk_bulk_data *clks;
+	int num_clks;
+	enum phy_mode phy_mode;
+	u32 stg_usb_mode;
+};
+
+static int set_phy_power_on(struct cdns_starfive *data)
+{
+	int ret;
+
+	ret = phy_power_on(data->usb2_phy);
+	if (ret)
+		return ret;
+
+	ret = phy_power_on(data->usb3_phy);
+	if (ret)
+		phy_power_off(data->usb2_phy);
+
+	return ret;
+}
+
+static void set_phy_power_off(struct cdns_starfive *data)
+{
+	phy_power_off(data->usb3_phy);
+	phy_power_off(data->usb2_phy);
+}
+
+static void cdns_mode_init(struct platform_device *pdev,
+				struct cdns_starfive *data)
+{
+	enum usb_dr_mode mode;
+
+	mode = usb_get_dr_mode(&pdev->dev);
+
+	switch (mode) {
+	case USB_DR_MODE_HOST:
+		regmap_update_bits(data->stg_syscon,
+			data->stg_usb_mode,
+			USB_STRAP_MASK,
+			USB_STRAP_HOST);
+		regmap_update_bits(data->stg_syscon,
+			data->stg_usb_mode,
+			USB_SUSPENDM_MASK,
+			USB_SUSPENDM_HOST);
+		data->phy_mode = PHY_MODE_USB_HOST;
+		break;
+
+	case USB_DR_MODE_PERIPHERAL:
+		regmap_update_bits(data->stg_syscon, data->stg_usb_mode,
+			USB_STRAP_MASK, USB_STRAP_DEVICE);
+		regmap_update_bits(data->stg_syscon, data->stg_usb_mode,
+			USB_SUSPENDM_MASK, 0);
+		data->phy_mode = PHY_MODE_USB_DEVICE;
+		break;
+
+	case USB_DR_MODE_OTG:
+		data->phy_mode = PHY_MODE_USB_OTG;
+	default:
+		break;
+	}
+}
+
+static int cdns_clk_rst_init(struct cdns_starfive *data)
+{
+	int ret;
+
+	data->num_clks = devm_clk_bulk_get_all(data->dev, &data->clks);
+	if (data->num_clks < 0)
+		return dev_err_probe(data->dev, -ENODEV,
+			"Failed to get clocks\n");
+
+	data->resets = devm_reset_control_array_get_exclusive(data->dev);
+	if (IS_ERR(data->resets)) {
+		return dev_err_probe(data->dev, PTR_ERR(data->resets),
+			"Failed to get resets");
+	}
+
+	ret = clk_bulk_prepare_enable(data->num_clks, data->clks);
+	if (ret)
+		return dev_err_probe(data->dev, ret,
+			"failed to enable clocks\n");
+
+	ret = reset_control_deassert(data->resets);
+	if (ret) {
+		ret = dev_err_probe(data->dev, ret,
+			"failed to reset clocks\n");
+		goto err_clk_init;
+	}
+
+	return ret;
+
+err_clk_init:
+	clk_bulk_disable_unprepare(data->num_clks, data->clks);
+	return ret;
+}
+
+static int cdns3_starfive_phy_init(struct device *dev, struct cdns_starfive *data)
+{
+	int ret;
+
+	ret = phy_init(data->usb2_phy);
+	if (ret)
+		return ret;
+
+	ret = phy_init(data->usb3_phy);
+	if (ret)
+		goto err_phy3_init;
+
+	ret = set_phy_power_on(data);
+	if (ret)
+		goto err_phy_power_on;
+
+	phy_set_mode(data->usb2_phy, data->phy_mode);
+	phy_set_mode(data->usb3_phy, data->phy_mode);
+
+	return 0;
+
+err_phy_power_on:
+	phy_exit(data->usb3_phy);
+err_phy3_init:
+	phy_exit(data->usb2_phy);
+	return ret;
+}
+
+static int cdns3_starfive_platform_device_add(struct platform_device *pdev,
+		struct cdns_starfive *data)
+{
+	struct platform_device *cdns3;
+	struct resource	cdns_res[CDNS_RESOURCES_NUM], *res;
+	struct device *dev = &pdev->dev;
+	const char *reg_name[CDNS_IOMEM_RESOURCES_NUM] = {"otg", "xhci", "dev"};
+	const char *irq_name[CDNS_IRQ_RESOURCES_NUM] = {"host", "peripheral", "otg", "wakeup"};
+	int i, ret, res_idx = 0;
+
+	cdns3 = platform_device_alloc("cdns-usb3", PLATFORM_DEVID_AUTO);
+	if (!cdns3)
+		return dev_err_probe(dev, -ENOMEM,
+			"couldn't alloc cdns3 usb device\n");
+
+	cdns3->dev.parent = dev;
+	memset(cdns_res, 0, sizeof(cdns_res));
+
+	for (i = 0; i < CDNS_IOMEM_RESOURCES_NUM; i++) {
+		res = platform_get_resource_byname(pdev, IORESOURCE_MEM, reg_name[i]);
+		if (!res) {
+			ret = dev_err_probe(dev,
+				-ENXIO, "couldn't get %s reg resource\n", reg_name[i]);
+			goto free_memory;
+		}
+		cdns_res[res_idx] = *res;
+		res_idx++;
+	}
+
+	for (i = 0; i < CDNS_IRQ_RESOURCES_NUM; i++) {
+		if (i == CDNS_IRQ_WAKEUP_INDEX) {
+			ret = platform_get_irq_byname_optional(pdev, irq_name[i]);
+			if (ret < 0)
+				continue;
+		} else {
+			ret = platform_get_irq_byname(pdev, irq_name[i]);
+			if (ret < 0) {
+				dev_err(dev, "couldn't get %s irq\n", irq_name[i]);
+				goto free_memory;
+			}
+		}
+		cdns_res[res_idx].start = ret;
+		cdns_res[res_idx].end = ret;
+		cdns_res[res_idx].flags = IORESOURCE_IRQ;
+		cdns_res[res_idx].name = irq_name[i];
+		res_idx++;
+	}
+
+	ret = platform_device_add_resources(cdns3, cdns_res, res_idx);
+	if (ret) {
+		dev_err(dev, "couldn't add res to cdns3 device\n");
+		goto free_memory;
+	}
+
+	ret = platform_device_add(cdns3);
+	if (ret) {
+		dev_err(dev, "failed to register cdns3 device\n");
+		goto free_memory;
+	}
+
+	return ret;
+free_memory:
+	platform_device_put(cdns3);
+	return ret;
+}
+
+static int cdns_starfive_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct cdns_starfive *data;
+	unsigned int args;
+	int ret;
+
+	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, data);
+
+	data->dev = dev;
+
+	data->stg_syscon = syscon_regmap_lookup_by_phandle_args(pdev->dev.of_node,
+		"starfive,stg-syscon", 1, &args);
+
+	if (IS_ERR(data->stg_syscon))
+		return dev_err_probe(dev, PTR_ERR(data->stg_syscon),
+			"Failed to parse starfive,stg-syscon\n");
+
+	data->stg_usb_mode = args;
+
+	cdns_mode_init(pdev, data);
+
+	ret = cdns_clk_rst_init(data);
+	if (ret)
+		return ret;
+
+	data->usb2_phy = devm_phy_optional_get(dev, "usb2-phy");
+	if (IS_ERR(data->usb2_phy))
+		return dev_err_probe(dev, PTR_ERR(data->usb2_phy),
+			"Failed to parse usb2 phy\n");
+
+	data->usb3_phy = devm_phy_optional_get(dev, "usb3-phy");
+	if (IS_ERR(data->usb3_phy))
+		return dev_err_probe(dev, PTR_ERR(data->usb3_phy),
+			"Failed to parse usb3 phy\n");
+
+	cdns3_starfive_phy_init(dev, data);
+
+	ret = cdns3_starfive_platform_device_add(pdev, data);
+	if (ret) {
+		set_phy_power_off(data);
+		phy_exit(data->usb3_phy);
+		phy_exit(data->usb2_phy);
+		reset_control_assert(data->resets);
+		clk_bulk_disable_unprepare(data->num_clks, data->clks);
+		return dev_err_probe(dev, ret, "Failed to create children\n");
+	}
+
+	device_set_wakeup_capable(dev, true);
+	pm_runtime_set_active(dev);
+	pm_runtime_enable(dev);
+
+	dev_info(dev, "usb mode %d probe success\n", data->phy_mode);
+
+	return 0;
+}
+
+static int cdns_starfive_remove_core(struct device *dev, void *c)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+
+	platform_device_unregister(pdev);
+
+	return 0;
+}
+
+static int cdns_starfive_remove(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct cdns_starfive *data = dev_get_drvdata(dev);
+
+	pm_runtime_get_sync(dev);
+	device_for_each_child(dev, NULL, cdns_starfive_remove_core);
+
+	set_phy_power_off(data);
+	phy_exit(data->usb2_phy);
+	phy_exit(data->usb3_phy);
+
+	reset_control_assert(data->resets);
+	clk_bulk_disable_unprepare(data->num_clks, data->clks);
+	pm_runtime_disable(dev);
+	pm_runtime_put_noidle(dev);
+	platform_set_drvdata(pdev, NULL);
+
+	return 0;
+}
+
+#ifdef CONFIG_PM
+static int cdns_starfive_resume(struct device *dev)
+{
+	struct cdns_starfive *data = dev_get_drvdata(dev);
+	int ret;
+
+	ret = clk_bulk_prepare_enable(data->num_clks, data->clks);
+	if (ret)
+		return ret;
+
+	ret = reset_control_deassert(data->resets);
+	if (ret)
+		return ret;
+
+	ret = cdns3_starfive_phy_init(dev, data);
+
+	return ret;
+}
+
+static int cdns_starfive_suspend(struct device *dev)
+{
+	struct cdns_starfive *data = dev_get_drvdata(dev);
+
+	set_phy_power_off(data);
+	phy_exit(data->usb2_phy);
+	phy_exit(data->usb3_phy);
+	reset_control_assert(data->resets);
+	clk_bulk_disable_unprepare(data->num_clks, data->clks);
+
+	return 0;
+}
+#endif
+
+static const struct dev_pm_ops cdns_starfive_pm_ops = {
+	SET_RUNTIME_PM_OPS(cdns_starfive_suspend, cdns_starfive_resume, NULL)
+	SET_SYSTEM_SLEEP_PM_OPS(cdns_starfive_suspend, cdns_starfive_resume)
+};
+
+static const struct of_device_id cdns_starfive_of_match[] = {
+	{ .compatible = "starfive,jh7110-usb", },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, cdns_starfive_of_match);
+
+static struct platform_driver cdns_starfive_driver = {
+	.probe		= cdns_starfive_probe,
+	.remove		= cdns_starfive_remove,
+	.driver		= {
+		.name	= "cdns3-starfive",
+		.of_match_table	= cdns_starfive_of_match,
+		.pm	= &cdns_starfive_pm_ops,
+	},
+};
+module_platform_driver(cdns_starfive_driver);
+
+MODULE_ALIAS("platform:cdns3-starfive");
+MODULE_AUTHOR("YanHong Wang <yanhong.wang@xxxxxxxxxxxxxxxx>");
+MODULE_AUTHOR("Mason Huo <mason.huo@xxxxxxxxxxxxxxxx>");
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("Cadence USB3 StarFive Glue Layer");
diff --git a/drivers/usb/cdns3/core.h b/drivers/usb/cdns3/core.h
index 2d332a788871..8d44ab504898 100644
--- a/drivers/usb/cdns3/core.h
+++ b/drivers/usb/cdns3/core.h
@@ -38,6 +38,9 @@ struct cdns_role_driver {
 };
 
 #define CDNS_XHCI_RESOURCES_NUM	2
+#define CDNS_IOMEM_RESOURCES_NUM	3
+#define CDNS_IRQ_RESOURCES_NUM		4
+#define CDNS_RESOURCES_NUM	(CDNS_IOMEM_RESOURCES_NUM + CDNS_IRQ_RESOURCES_NUM)
 
 struct cdns3_platform_data {
 	int (*platform_suspend)(struct device *dev,
-- 
2.17.1