--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+/**
+ * cdns3-ti.c - TI specific Glue layer for Cadence USB Controller
+ *
+ * Copyright (C) 2019 Texas Instruments Incorporated - http://www.ti.com
+ */
+
+#include <linux/bits.h>
+#include <linux/clk.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/dma-mapping.h>
+#include <linux/io.h>
+#include <linux/of_platform.h>
+#include <linux/pm_runtime.h>
+
+/* USB Wrapper register offsets */
+#define USBSS_PID 0x0
+#define USBSS_W1 0x4
+#define USBSS_STATIC_CONFIG 0x8
+#define USBSS_PHY_TEST 0xc
+#define USBSS_DEBUG_CTRL 0x10
+#define USBSS_DEBUG_INFO 0x14
+#define USBSS_DEBUG_LINK_STATE 0x18
+#define USBSS_DEVICE_CTRL 0x1c
+
+/* Wrapper 1 register bits */
+#define USBSS_W1_PWRUP_RST BIT(0)
+#define USBSS_W1_OVERCURRENT_SEL BIT(8)
+#define USBSS_W1_MODESTRAP_SEL BIT(9)
+#define USBSS_W1_OVERCURRENT BIT(16)
+#define USBSS_W1_MODESTRAP_MASK GENMASK(18, 17)
+#define USBSS_W1_MODESTRAP_SHIFT 17
+#define USBSS_W1_USB2_ONLY BIT(19)
+
+/* Static config register bits */
+#define USBSS1_STATIC_PLL_REF_SEL_MASK GENMASK(8, 5)
+#define USBSS1_STATIC_PLL_REF_SEL_SHIFT 5
+#define USBSS1_STATIC_LOOPBACK_MODE_MASK GENMASK(4, 3)
+#define USBSS1_STATIC_LOOPBACK_MODE_SHIFT 3
+#define USBSS1_STATIC_VBUS_SEL_MASK GENMASK(2, 1)
+#define USBSS1_STATIC_VBUS_SEL_SHIFT 1
+#define USBSS1_STATIC_LANE_REVERSE BIT(0)
+
+/* Modestrap modes */
+enum modestrap_mode { USBSS_MODESTRAP_MODE_NONE,
+ USBSS_MODESTRAP_MODE_HOST,
+ USBSS_MODESTRAP_MODE_PERIPHERAL};
+
+struct cdns_ti {
+ struct device *dev;
+ void __iomem *usbss;
+ int usb2_only:1;
+ int vbus_divider:1;
+ struct clk *usb2_refclk;
+ struct clk *lpm_clk;
+};
+
+static const int cdns_ti_rate_table[] = { /* in KHZ */
+ 9600,
+ 10000,
+ 12000,
+ 19200,
+ 20000,
+ 24000,
+ 25000,
+ 26000,
+ 38400,
+ 40000,
+ 58000,
+ 50000,
+ 52000,
+};
+
+static inline u32 cdns_ti_readl(struct cdns_ti *data, u32 offset)
+{
+ return readl(data->usbss + offset);
+}
+
+static inline void cdns_ti_writel(struct cdns_ti *data, u32 offset, u32 value)
+{
+ writel(value, data->usbss + offset);
+}
+
+static int cdns_ti_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct device_node *node = pdev->dev.of_node;
+ struct cdns_ti *data;
+ int error;
+ u32 reg;
+ int rate_code, i;
+ unsigned long rate;
+
+ data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ platform_set_drvdata(pdev, data);
+
+ data->dev = dev;
+
+ data->usbss = devm_platform_ioremap_resource(pdev, 0);
+ if (IS_ERR(data->usbss)) {
+ dev_err(dev, "can't map IOMEM resource\n");
+ return PTR_ERR(data->usbss);
+ }
+
+ data->usb2_refclk = devm_clk_get(dev, "ref");
+ if (IS_ERR(data->usb2_refclk)) {
+ dev_err(dev, "can't get usb2_refclk\n");
+ return PTR_ERR(data->usb2_refclk);
+ }
+
+ data->lpm_clk = devm_clk_get(dev, "lpm");
+ if (IS_ERR(data->lpm_clk)) {
+ dev_err(dev, "can't get lpm_clk\n");
+ return PTR_ERR(data->lpm_clk);
+ }
+
+ rate = clk_get_rate(data->usb2_refclk);
+ rate /= 1000; /* To KHz */
+ for (i = 0; i < ARRAY_SIZE(cdns_ti_rate_table); i++) {
+ if (cdns_ti_rate_table[i] == rate)
+ break;
+ }
+
+ if (i == ARRAY_SIZE(cdns_ti_rate_table)) {
+ dev_err(dev, "unsupported usb2_refclk rate: %lu KHz\n", rate);
+ return -EINVAL;
+ }
+
+ rate_code = i;
+
+ pm_runtime_enable(dev);
+ error = pm_runtime_get_sync(dev);
+ if (error < 0) {
+ dev_err(dev, "pm_runtime_get_sync failed: %d\n", error);
+ goto err_get;
+ }
+
+ /* assert RESET */
+ reg = cdns_ti_readl(data, USBSS_W1);
+ reg &= ~USBSS_W1_PWRUP_RST;
+ cdns_ti_writel(data, USBSS_W1, reg);
+
+ /* set static config */
+ reg = cdns_ti_readl(data, USBSS_STATIC_CONFIG);
+ reg &= ~USBSS1_STATIC_PLL_REF_SEL_MASK;
+ reg |= rate_code << USBSS1_STATIC_PLL_REF_SEL_SHIFT;
+
+ reg &= ~USBSS1_STATIC_VBUS_SEL_MASK;
+ data->vbus_divider = device_property_read_bool(dev, "ti,vbus-divider");
+ if (data->vbus_divider)
+ reg |= 1 << USBSS1_STATIC_VBUS_SEL_SHIFT;
+
+ cdns_ti_writel(data, USBSS_STATIC_CONFIG, reg);
+ reg = cdns_ti_readl(data, USBSS_STATIC_CONFIG);
+
+ /* set USB2_ONLY mode if requested */
+ reg = cdns_ti_readl(data, USBSS_W1);
+ data->usb2_only = device_property_read_bool(dev, "ti,usb2-only");
+ if (data->usb2_only)
+ reg |= USBSS_W1_USB2_ONLY;
+
+ /* set default modestrap */
+ reg |= USBSS_W1_MODESTRAP_SEL;
+ reg &= ~USBSS_W1_MODESTRAP_MASK;
+ reg |= USBSS_MODESTRAP_MODE_NONE << USBSS_W1_MODESTRAP_SHIFT;
+ cdns_ti_writel(data, USBSS_W1, reg);
+
+ /* de-assert RESET */
+ reg |= USBSS_W1_PWRUP_RST;
+ cdns_ti_writel(data, USBSS_W1, reg);
+
+ error = of_platform_populate(node, NULL, NULL, dev);
+ if (error) {
+ dev_err(dev, "failed to create children: %d\n", error);
+ goto err;
+ }
+
+ return 0;
+
+err:
+ pm_runtime_put_sync(data->dev);
+err_get:
+ pm_runtime_disable(data->dev);
+
+ return error;
+}
+
+static int cdns_ti_remove_core(struct device *dev, void *c)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+
+ platform_device_unregister(pdev);
+
+ return 0;
+}
+
+static int cdns_ti_remove(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+
+ device_for_each_child(dev, NULL, cdns_ti_remove_core);
+ pm_runtime_put_sync(dev);
+ pm_runtime_disable(dev);
+
+ platform_set_drvdata(pdev, NULL);
+
+ return 0;
+}
+
+static const struct of_device_id cdns_ti_of_match[] = {
+ { .compatible = "ti,j721e-usb", },
+ {},
+};
+MODULE_DEVICE_TABLE(of, cdns_ti_of_match);
+
+static struct platform_driver cdns_ti_driver = {
+ .probe = cdns_ti_probe,
+ .remove = cdns_ti_remove,
+ .driver = {
+ .name = "cdns3-ti",
+ .of_match_table = cdns_ti_of_match,
+ },
+};
+
+module_platform_driver(cdns_ti_driver);
+
+MODULE_ALIAS("platform:cdns3-ti");
+MODULE_AUTHOR("Roger Quadros <rogerq@ti.com>");
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("Cadence USB3 TI Glue Layer");
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