usb: cdns: starfive: Add cdns USB driver

Add Starfive cdns USB3 wrapper driver.

Signed-off-by: Minda Chen <minda.chen@starfivetech.com>
Reviewed-by: Marek Vasut <marex@denx.de>
Tested-by: E Shattow <lucent@gmail.com>

drivers/usb/cdns3/cdns3-starfive.c

@@ -0,0 +1,182 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * cdns3-starfive.c - StarFive specific Glue layer for Cadence USB Controller
+ *
+ * Copyright (C) 2024 StarFive Technology Co., Ltd.
+ *
+ * Author:	Minda Chen <minda.chen@starfivetech.com>
+ */
+
+#include <asm/io.h>
+#include <clk.h>
+#include <dm.h>
+#include <dm/device_compat.h>
+#include <linux/bitops.h>
+#include <linux/usb/otg.h>
+#include <malloc.h>
+#include <reset.h>
+#include <regmap.h>
+#include <syscon.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_MISC_CFG_MASK		GENMASK(23, 20)
+#define USB_SUSPENDM_BYPS		BIT(20)
+#define USB_PLL_EN			BIT(22)
+#define USB_REFCLK_MODE			BIT(23)
+
+struct cdns_starfive {
+	struct udevice *dev;
+	struct regmap *stg_syscon;
+	struct reset_ctl_bulk resets;
+	struct clk_bulk clks;
+	u32 stg_usb_mode;
+	enum usb_dr_mode mode;
+};
+
+static void cdns_mode_init(struct cdns_starfive *data, enum usb_dr_mode mode)
+{
+	unsigned int strap, suspendm;
+
+	regmap_update_bits(data->stg_syscon, data->stg_usb_mode,
+			   USB_MISC_CFG_MASK,
+			   USB_SUSPENDM_BYPS | USB_PLL_EN | USB_REFCLK_MODE);
+
+	switch (mode) {
+	case USB_DR_MODE_HOST:
+		strap = USB_STRAP_HOST;
+		suspendm = USB_SUSPENDM_HOST;
+		break;
+	case USB_DR_MODE_PERIPHERAL:
+		strap = USB_STRAP_DEVICE;
+		suspendm = 0;
+		break;
+	default:
+		return;
+	}
+
+	regmap_update_bits(data->stg_syscon, data->stg_usb_mode,
+			   USB_SUSPENDM_MASK | USB_STRAP_MASK,
+			   strap | suspendm);
+}
+
+static void cdns_clk_rst_deinit(struct cdns_starfive *data)
+{
+	reset_assert_bulk(&data->resets);
+	clk_disable_bulk(&data->clks);
+}
+
+static int cdns_clk_rst_init(struct cdns_starfive *data)
+{
+	int ret;
+
+	ret = clk_get_bulk(data->dev, &data->clks);
+	if (ret)
+		return ret;
+
+	ret = reset_get_bulk(data->dev, &data->resets);
+	if (ret)
+		goto err_clk;
+
+	ret = clk_enable_bulk(&data->clks);
+	if (ret) {
+		dev_err(data->dev, "clk enable failed: %d\n", ret);
+		goto err_en_clk;
+	}
+
+	ret = reset_deassert_bulk(&data->resets);
+	if (ret) {
+		dev_err(data->dev, "reset deassert failed: %d\n", ret);
+		goto err_reset;
+	}
+
+	return 0;
+
+err_reset:
+	clk_disable_bulk(&data->clks);
+err_en_clk:
+	reset_release_bulk(&data->resets);
+err_clk:
+	clk_release_bulk(&data->clks);
+
+	return ret;
+}
+
+static int cdns_starfive_get_syscon(struct cdns_starfive *data)
+{
+	struct ofnode_phandle_args phandle;
+	int ret;
+
+	ret = dev_read_phandle_with_args(data->dev, "starfive,stg-syscon", NULL, 1, 0,
+					 &phandle);
+	if (ret < 0) {
+		dev_err(data->dev, "Can't get stg cfg phandle: %d\n", ret);
+		return ret;
+	}
+
+	data->stg_syscon = syscon_node_to_regmap(phandle.node);
+	if (IS_ERR(data->stg_syscon)) {
+		dev_err(data->dev, "fail to get regmap: %d\n", (int)PTR_ERR(data->stg_syscon));
+		return PTR_ERR(data->stg_syscon);
+	}
+
+	data->stg_usb_mode = phandle.args[0];
+
+	return 0;
+}
+
+static int cdns_starfive_probe(struct udevice *dev)
+{
+	struct cdns_starfive *data = dev_get_plat(dev);
+	enum usb_dr_mode dr_mode;
+	int ret;
+
+	data->dev = dev;
+
+	ret = cdns_starfive_get_syscon(data);
+	if (ret)
+		return ret;
+
+	dr_mode = usb_get_dr_mode(dev_ofnode(dev));
+
+	data->mode = dr_mode;
+	ret = cdns_clk_rst_init(data);
+	if (ret) {
+		dev_err(data->dev, "clk reset failed: %d\n", ret);
+		return ret;
+	}
+	cdns_mode_init(data, dr_mode);
+
+	return 0;
+}
+
+static int cdns_starfive_remove(struct udevice *dev)
+{
+	struct cdns_starfive *data = dev_get_plat(dev);
+
+	cdns_clk_rst_deinit(data);
+	return 0;
+}
+
+static const struct udevice_id cdns_starfive_of_match[] = {
+	{ .compatible = "starfive,jh7110-usb", },
+	{},
+};
+
+U_BOOT_DRIVER(cdns_starfive) = {
+	.name = "cdns-starfive",
+	.id = UCLASS_NOP,
+	.of_match = cdns_starfive_of_match,
+	.bind = cdns3_bind,
+	.probe = cdns_starfive_probe,
+	.remove = cdns_starfive_remove,
+	.plat_auto	= sizeof(struct cdns_starfive),
+	.flags = DM_FLAG_OS_PREPARE,
+};