+// 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@starfivetech.com>
+ * Author: Mason Huo <mason.huo@starfivetech.com>
+ * Author: Minda Chen <minda.chen@starfivetech.com>
+ */
+
+#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 USB_SUSPENDM_BYPS BIT(20)
+#define USB_REFCLK_MODE BIT(23)
+#define USB_PLL_EN BIT(22)
+#define USB_PDRSTN_SPLIT BIT(17)
+
+#define PCIE_CKREF_SRC_MASK GENMASK(19, 18)
+#define PCIE_CLK_SEL_MASK GENMASK(21, 20)
+#define PCIE_PHY_MODE BIT(20)
+#define PCIE_PHY_MODE_MASK GENMASK(21, 20)
+#define PCIE_USB3_BUS_WIDTH_MASK GENMASK(3, 2)
+#define PCIE_USB3_RATE_MASK GENMASK(6, 5)
+#define PCIE_USB3_RX_STANDBY_MASK BIT(7)
+#define PCIE_USB3_PHY_ENABLE BIT(4)
+
+struct cdns_starfive {
+ struct device *dev;
+ struct regmap *stg_syscon;
+ struct regmap *sys_syscon;
+ struct reset_control *resets;
+ struct clk_bulk_data *clks;
+ int num_clks;
+ u32 sys_offset;
+ u32 stg_offset_4;
+ u32 stg_offset_196;
+ u32 stg_offset_328;
+ u32 stg_offset_500;
+ bool usb2_only;
+};
+
+static int cdns_mode_init(struct platform_device *pdev,
+ struct cdns_starfive *data, const char **out_mode)
+{
+ struct device_node *child;
+ const char *dr_mode = NULL;
+
+ child = of_get_compatible_child(pdev->dev.of_node, "cdns,usb3");
+ if (!child) {
+ return dev_err_probe(&pdev->dev, -ENODEV,
+ "Failed to find child node\n");
+ }
+
+ /* Init usb 2.0 utmi phy */
+ regmap_update_bits(data->stg_syscon, data->stg_offset_4,
+ USB_SUSPENDM_BYPS, USB_SUSPENDM_BYPS);
+ regmap_update_bits(data->stg_syscon, data->stg_offset_4,
+ USB_PLL_EN, USB_PLL_EN);
+ regmap_update_bits(data->stg_syscon, data->stg_offset_4,
+ USB_REFCLK_MODE, USB_REFCLK_MODE);
+
+ if (!of_find_property(child, "cdns3,usb3-phy", NULL)) {
+ /* Disconnect usb 3.0 phy mode */
+ regmap_update_bits(data->sys_syscon, data->sys_offset,
+ USB_PDRSTN_SPLIT, USB_PDRSTN_SPLIT);
+ data->usb2_only = 1;
+ } else {
+ /* Config usb 3.0 pipe phy */
+ regmap_update_bits(data->stg_syscon, data->stg_offset_196,
+ PCIE_CKREF_SRC_MASK, 0);
+ regmap_update_bits(data->stg_syscon, data->stg_offset_196,
+ PCIE_CLK_SEL_MASK, 0);
+ regmap_update_bits(data->stg_syscon, data->stg_offset_328,
+ PCIE_PHY_MODE_MASK, PCIE_PHY_MODE);
+ regmap_update_bits(data->stg_syscon, data->stg_offset_500,
+ PCIE_USB3_BUS_WIDTH_MASK, 0);
+ regmap_update_bits(data->stg_syscon, data->stg_offset_500,
+ PCIE_USB3_RATE_MASK, 0);
+ regmap_update_bits(data->stg_syscon, data->stg_offset_500,
+ PCIE_USB3_RX_STANDBY_MASK, 0);
+ regmap_update_bits(data->stg_syscon, data->stg_offset_500,
+ PCIE_USB3_PHY_ENABLE, PCIE_USB3_PHY_ENABLE);
+
+ /* Connect usb 3.0 phy mode */
+ regmap_update_bits(data->sys_syscon, data->sys_offset,
+ USB_PDRSTN_SPLIT, 0);
+ }
+
+ if (!of_property_read_string(child, "dr_mode", &dr_mode)) {
+ if (!strcmp(dr_mode, "host")) {
+ regmap_update_bits(data->stg_syscon,
+ data->stg_offset_4,
+ USB_STRAP_MASK,
+ USB_STRAP_HOST);
+ regmap_update_bits(data->stg_syscon,
+ data->stg_offset_4,
+ USB_SUSPENDM_MASK,
+ USB_SUSPENDM_HOST);
+ } else if (!strcmp(dr_mode, "peripheral")) {
+ regmap_update_bits(data->stg_syscon, data->stg_offset_4,
+ USB_STRAP_MASK, USB_STRAP_DEVICE);
+ regmap_update_bits(data->stg_syscon, data->stg_offset_4,
+ USB_SUSPENDM_MASK, 0);
+ }
+ }
+
+ if (out_mode)
+ *out_mode = dr_mode;
+
+ return 0;
+}
+
+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");
+
+ ret = clk_bulk_prepare_enable(data->num_clks, data->clks);
+ if (ret)
+ return dev_err_probe(data->dev, ret,
+ "failed to enable clocks\n");
+
+ data->resets = devm_reset_control_array_get_exclusive(data->dev);
+ if (IS_ERR(data->resets)) {
+ ret = dev_err_probe(data->dev, PTR_ERR(data->resets),
+ "Failed to get resets");
+ goto err_clk_init;
+ }
+
+ 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 cdns_starfive_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct device_node *node = pdev->dev.of_node;
+ struct cdns_starfive *data;
+ unsigned int args[4];
+ const char *dr_mode;
+ 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", 4, 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_offset_4 = args[0];
+ data->stg_offset_196 = args[1];
+ data->stg_offset_328 = args[2];
+ data->stg_offset_500 = args[3];
+
+ data->sys_syscon = syscon_regmap_lookup_by_phandle_args(pdev->dev.of_node,
+ "starfive,sys-syscon", 1, args);
+ if (IS_ERR(data->sys_syscon))
+ return dev_err_probe(dev, PTR_ERR(data->sys_syscon),
+ "Failed to parse starfive,sys-syscon\n");
+
+ data->sys_offset = args[0];
+
+ ret = cdns_mode_init(pdev, data, &dr_mode);
+ if (ret)
+ return ret;
+
+ ret = cdns_clk_rst_init(data);
+ if (ret)
+ return ret;
+
+ ret = of_platform_populate(node, NULL, NULL, dev);
+ if (ret)
+ 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 %s %s probe success\n",
+ dr_mode ? dr_mode : "unknown", data->usb2_only ? "2.0" : "3.0");
+
+ 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);
+
+ 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;
+
+ return 0;
+}
+
+static int cdns_starfive_suspend(struct device *dev)
+{
+ struct cdns_starfive *data = dev_get_drvdata(dev);
+
+ clk_bulk_disable_unprepare(data->num_clks, data->clks);
+ reset_control_assert(data->resets);
+
+ 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@starfivetech.com>");
+MODULE_AUTHOR("Mason Huo <mason.huo@starfivetech.com>");
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("Cadence USB3 StarFive Glue Layer");
projects / platform / kernel / linux-starfive.git / commitdiff