usb:cdns3:cdns3-starfive: Add StarFive wrapper driver for CDNS USB3 controller

Add driver to handle StarFive  specific wrapper for Cadence USB3 controller
present on JH7110  SoC.

Signed-off-by: yanhong.wang <yanhong.wang@starfivetech.com>

diff --git a/drivers/usb/cdns3/Kconfig b/drivers/usb/cdns3/Kconfig
index b98ca0a..5335818 100644 (file)
--- a/drivers/usb/cdns3/Kconfig
+++ b/drivers/usb/cdns3/Kconfig
@@ -78,6 +78,15 @@ config USB_CDNS3_IMX
 
          For example, imx8qm and imx8qxp.
 
+config USB_CDNS3_STARFIVE
+       tristate "Cadence USB3 support on StarFive SoC platforms"
+       depends on SOC_STARFIVE || COMPILE_TEST || USB_CDNS3
+       help
+         Say 'Y' or 'M' here if you are building for StarFive SoCs
+         platforms that contain Cadence USB3 controller core.
+
+         e.g. JH7110.
+
 endif
 
 if USB_CDNS_SUPPORT

diff --git a/drivers/usb/cdns3/Makefile b/drivers/usb/cdns3/Makefile
index 61edb2f..48dfae7 100644 (file)
--- 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 (file)
index 0000000..811e017
--- /dev/null
+++ b/drivers/usb/cdns3/cdns3-starfive.c
@@ -0,0 +1,226 @@
+// SPDX-License-Identifier: GPL-2.0
+/**
+ * cdns-starfive.c - Cadence USB Controller
+ *
+ * Copyright (C) 2022 Starfive, Inc.
+ * Author:     yanhong <yanhong.wang@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>
+
+#define USB_STRAP_HOST         0x20000U
+#define USB_STRAP_DEVICE       0x40000U
+#define USB_STRAP_MASK         0x70000U
+
+#define USB_SUSPENDM_HOST      0x80000U
+#define USB_SUSPENDM_DEVICE    0x0U
+#define USB_SUSPENDM_MASK      0x80000U
+
+#define USB_SUSPENDM_BYPS_VALUE        0x100000U
+#define USB_SUSPENDM_BYPS_MASK 0x100000U
+
+#define USB_REFCLK_MODE_VALUE  0x800000U
+#define USB_REFCLK_MODE_MASK   0x800000U
+
+#define USB_PLL_EN_VALUE       0x400000U
+#define USB_PLL_EN_MASK                0x400000U
+
+#define USB_PDRSTN_SPLIT_USB30 0x20000U
+#define USB_PDRSTN_SPLIT_USB20 0x0U
+#define USB_PDRSTN_SPLIT_MASK  0x20000U
+
+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;
+};
+
+static int cdns_mode_init(struct platform_device *pdev,
+                               struct cdns_starfive *data)
+{
+       enum usb_dr_mode mode;
+
+       regmap_update_bits(data->stg_syscon, data->stg_offset,
+               USB_SUSPENDM_BYPS_MASK, USB_SUSPENDM_BYPS_VALUE);
+       regmap_update_bits(data->stg_syscon, data->stg_offset,
+               USB_PLL_EN_MASK, USB_PLL_EN_VALUE);
+       regmap_update_bits(data->stg_syscon, data->stg_offset,
+               USB_REFCLK_MODE_MASK, USB_REFCLK_MODE_VALUE);
+       regmap_update_bits(data->stg_syscon, data->stg_offset,
+               USB_PDRSTN_SPLIT_MASK, USB_PDRSTN_SPLIT_USB30);
+
+       mode = usb_get_dr_mode(&pdev->dev);
+
+       switch (mode) {
+       case USB_DR_MODE_HOST:
+               regmap_update_bits(data->stg_syscon, data->stg_offset,
+                       USB_STRAP_MASK, USB_STRAP_HOST);
+               regmap_update_bits(data->stg_syscon, data->stg_offset,
+                       USB_SUSPENDM_MASK, USB_SUSPENDM_HOST);
+               break;
+
+       case USB_DR_MODE_PERIPHERAL:
+               regmap_update_bits(data->stg_syscon, data->stg_offset,
+                       USB_STRAP_MASK, USB_STRAP_DEVICE);
+               regmap_update_bits(data->stg_syscon, data->stg_offset,
+                       USB_SUSPENDM_MASK, USB_SUSPENDM_DEVICE);
+               break;
+
+       case USB_DR_MODE_UNKNOWN:
+       case USB_DR_MODE_OTG:
+       default:
+               break;
+       }
+
+       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) {
+               dev_err(data->dev, "Failed to get usb clocks\n");
+               ret = -ENODEV;
+               goto exit;
+       }
+       ret = clk_bulk_prepare_enable(data->num_clks, data->clks);
+       if (ret) {
+               dev_err(data->dev, "Failed to enable clocks\n");
+               goto exit;
+       }
+
+       data->resets = devm_reset_control_array_get_exclusive(data->dev);
+       if (IS_ERR(data->resets)) {
+               ret = PTR_ERR(data->resets);
+               dev_err(data->dev, "Failed to get usb resets");
+               goto err_clk_init;
+       }
+       ret = reset_control_deassert(data->resets);
+       goto exit;
+
+err_clk_init:
+       clk_bulk_disable_unprepare(data->num_clks, data->clks);
+exit:
+       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;
+       struct of_phandle_args args;
+       int ret;
+
+       data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
+       if (!data)
+               return -ENOMEM;
+
+       platform_set_drvdata(pdev, data);
+
+       data->dev = dev;
+
+       ret = cdns_clk_rst_init(data);
+       if (ret < 0) {
+               dev_err(&pdev->dev, "Failed to init usb clk reset: %d\n", ret);
+               goto exit;
+       }
+
+       ret = of_parse_phandle_with_fixed_args(pdev->dev.of_node,
+                                               "starfive,stg-syscon", 1, 0, &args);
+       if (ret < 0) {
+               dev_err(dev, "Failed to parse starfive,stg-syscon\n");
+               return -EINVAL;
+       }
+
+       data->stg_syscon = syscon_node_to_regmap(args.np);
+       of_node_put(args.np);
+       if (IS_ERR(data->stg_syscon))
+               return PTR_ERR(data->stg_syscon);
+       data->stg_offset = args.args[0];
+
+       ret = of_parse_phandle_with_fixed_args(pdev->dev.of_node,
+                                               "starfive,sys-syscon", 1, 0, &args);
+       if (ret < 0) {
+               dev_err(dev, "Failed to parse starfive,sys-syscon\n");
+               return -EINVAL;
+       }
+
+       data->sys_syscon = syscon_node_to_regmap(args.np);
+       of_node_put(args.np);
+       if (IS_ERR(data->sys_syscon))
+               return PTR_ERR(data->sys_syscon);
+       data->sys_offset = args.args[0];
+
+       cdns_mode_init(pdev, data);
+
+       ret = of_platform_populate(node, NULL, NULL, dev);
+       if (ret) {
+               dev_err(dev, "failed to create children: %d\n", ret);
+               goto exit;
+       }
+
+       return 0;
+exit:
+       return ret;
+}
+
+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;
+
+       device_for_each_child(dev, NULL, cdns_starfive_remove_core);
+
+       platform_set_drvdata(pdev, NULL);
+
+       return 0;
+}
+
+static const struct of_device_id cdns_starfive_of_match[] = {
+       { .compatible = "starfive,jh7110-cdns3", },
+       {},
+};
+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,
+       },
+};
+
+module_platform_driver(cdns_starfive_driver);
+
+MODULE_ALIAS("platform:cdns3-starfive");
+MODULE_AUTHOR("YanHong Wang <yanhong.wang@starfivetech.com>");
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("Cadence USB3 StarFive SoC platform");