1 // SPDX-License-Identifier: GPL-2.0
3  * dwc3-am62.c - TI specific Glue layer for AM62 DWC3 USB Controller
5  * Copyright (C) 2022 Texas Instruments Incorporated - https://www.ti.com
43 /* PHY CONFIG register bits */
48 /* MODE CONTROL register bits */
51 /* WAKEUP CONFIG register bits */
57 /* WAKEUP STAT register bits */
64 /* IRQ_MISC_STATUS_RAW register bits */
68 /* IRQ_MISC_STATUS register bits */
72 /* IRQ_MISC_ENABLE_SET register bits */
76 /* IRQ_MISC_ENABLE_CLR register bits */
80 /* IRQ_MISC_EOI register bits */
83 /* VBUS_STAT register bits */
118 static inline u32 dwc3_ti_readl(struct dwc3_data *data, u32 offset)  in dwc3_ti_readl()  argument
120 	return readl((data->usbss) + offset);  in dwc3_ti_readl()
123 static inline void dwc3_ti_writel(struct dwc3_data *data, u32 offset, u32 value)  in dwc3_ti_writel()  argument
125 	writel(value, (data->usbss) + offset);  in dwc3_ti_writel()
128 static int phy_syscon_pll_refclk(struct dwc3_data *data)  in phy_syscon_pll_refclk()  argument
130 	struct device *dev = data->dev;  in phy_syscon_pll_refclk()
131 	struct device_node *node = dev->of_node;  in phy_syscon_pll_refclk()
136 	syscon = syscon_regmap_lookup_by_phandle(node, "ti,syscon-phy-pll-refclk");  in phy_syscon_pll_refclk()
138 		dev_err(dev, "unable to get ti,syscon-phy-pll-refclk regmap\n");  in phy_syscon_pll_refclk()
142 	data->syscon = syscon;  in phy_syscon_pll_refclk()
144 	ret = of_parse_phandle_with_fixed_args(node, "ti,syscon-phy-pll-refclk", 1,  in phy_syscon_pll_refclk()
149 	data->offset = args.args[0];  in phy_syscon_pll_refclk()
151 	ret = regmap_update_bits(data->syscon, data->offset, PHY_PLL_REFCLK_MASK, data->rate_code);  in phy_syscon_pll_refclk()
162 	struct device *dev = &pdev->dev;  in dwc3_ti_probe()
163 	struct device_node *node = pdev->dev.of_node;  in dwc3_ti_probe()
164 	struct dwc3_data *data;  in dwc3_ti_probe()  local
169 	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);  in dwc3_ti_probe()
170 	if (!data)  in dwc3_ti_probe()
171 		return -ENOMEM;  in dwc3_ti_probe()
173 	data->dev = dev;  in dwc3_ti_probe()
174 	platform_set_drvdata(pdev, data);  in dwc3_ti_probe()
176 	data->usbss = devm_platform_ioremap_resource(pdev, 0);  in dwc3_ti_probe()
177 	if (IS_ERR(data->usbss)) {  in dwc3_ti_probe()
179 		return PTR_ERR(data->usbss);  in dwc3_ti_probe()
182 	data->usb2_refclk = devm_clk_get(dev, "ref");  in dwc3_ti_probe()
183 	if (IS_ERR(data->usb2_refclk)) {  in dwc3_ti_probe()
185 		return PTR_ERR(data->usb2_refclk);  in dwc3_ti_probe()
189 	rate = clk_get_rate(data->usb2_refclk);  in dwc3_ti_probe()
198 		return -EINVAL;  in dwc3_ti_probe()
201 	data->rate_code = i;  in dwc3_ti_probe()
204 	ret = phy_syscon_pll_refclk(data);  in dwc3_ti_probe()
209 	data->vbus_divider = device_property_read_bool(dev, "ti,vbus-divider");  in dwc3_ti_probe()
210 	reg = dwc3_ti_readl(data, USBSS_PHY_CONFIG);  in dwc3_ti_probe()
211 	if (data->vbus_divider)  in dwc3_ti_probe()
214 	dwc3_ti_writel(data, USBSS_PHY_CONFIG, reg);  in dwc3_ti_probe()
222 	clk_prepare_enable(data->usb2_refclk);  in dwc3_ti_probe()
232 	reg = dwc3_ti_readl(data, USBSS_MODE_CONTROL);  in dwc3_ti_probe()
234 	dwc3_ti_writel(data, USBSS_MODE_CONTROL, reg);  in dwc3_ti_probe()
244 	clk_disable_unprepare(data->usb2_refclk);  in dwc3_ti_probe()
260 	struct device *dev = &pdev->dev;  in dwc3_ti_remove()
261 	struct dwc3_data *data = platform_get_drvdata(pdev);  in dwc3_ti_remove()  local
267 	reg = dwc3_ti_readl(data, USBSS_MODE_CONTROL);  in dwc3_ti_remove()
269 	dwc3_ti_writel(data, USBSS_MODE_CONTROL, reg);  in dwc3_ti_remove()
272 	clk_disable_unprepare(data->usb2_refclk);  in dwc3_ti_remove()
283 	struct dwc3_data *data = dev_get_drvdata(dev);  in dwc3_ti_suspend_common()  local
285 	clk_disable_unprepare(data->usb2_refclk);  in dwc3_ti_suspend_common()
292 	struct dwc3_data *data = dev_get_drvdata(dev);  in dwc3_ti_resume_common()  local
294 	clk_prepare_enable(data->usb2_refclk);  in dwc3_ti_resume_common()
308 	{ .compatible = "ti,am62-usb"},
317 		.name	= "dwc3-am62",
325 MODULE_ALIAS("platform:dwc3-am62");
326 MODULE_AUTHOR("Aswath Govindraju <a-govindraju@ti.com>");