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
22 /* USB WRAPPER register offsets */
132 static inline u32 dwc3_ti_readl(struct dwc3_am62 *am62, u32 offset)  in dwc3_ti_readl()  argument
134 	return readl((am62->usbss) + offset);  in dwc3_ti_readl()
137 static inline void dwc3_ti_writel(struct dwc3_am62 *am62, u32 offset, u32 value)  in dwc3_ti_writel()  argument
139 	writel(value, (am62->usbss) + offset);  in dwc3_ti_writel()
142 static int phy_syscon_pll_refclk(struct dwc3_am62 *am62)  in phy_syscon_pll_refclk()  argument
144 	struct device *dev = am62->dev;  in phy_syscon_pll_refclk()
145 	struct device_node *node = dev->of_node;  in phy_syscon_pll_refclk()
150 	syscon = syscon_regmap_lookup_by_phandle(node, "ti,syscon-phy-pll-refclk");  in phy_syscon_pll_refclk()
152 		dev_err(dev, "unable to get ti,syscon-phy-pll-refclk regmap\n");  in phy_syscon_pll_refclk()
156 	am62->syscon = syscon;  in phy_syscon_pll_refclk()
158 	ret = of_parse_phandle_with_fixed_args(node, "ti,syscon-phy-pll-refclk", 1,  in phy_syscon_pll_refclk()
164 	am62->offset = args.args[0];  in phy_syscon_pll_refclk()
166 	ret = regmap_update_bits(am62->syscon, am62->offset, PHY_PLL_REFCLK_MASK, am62->rate_code);  in phy_syscon_pll_refclk()
177 	struct device *dev = &pdev->dev;  in dwc3_ti_probe()
178 	struct device_node *node = pdev->dev.of_node;  in dwc3_ti_probe()
179 	struct dwc3_am62 *am62;  in dwc3_ti_probe()  local
184 	am62 = devm_kzalloc(dev, sizeof(*am62), GFP_KERNEL);  in dwc3_ti_probe()
185 	if (!am62)  in dwc3_ti_probe()
186 		return -ENOMEM;  in dwc3_ti_probe()
188 	am62->dev = dev;  in dwc3_ti_probe()
189 	platform_set_drvdata(pdev, am62);  in dwc3_ti_probe()
191 	am62->usbss = devm_platform_ioremap_resource(pdev, 0);  in dwc3_ti_probe()
192 	if (IS_ERR(am62->usbss)) {  in dwc3_ti_probe()
194 		return PTR_ERR(am62->usbss);  in dwc3_ti_probe()
197 	am62->usb2_refclk = devm_clk_get(dev, "ref");  in dwc3_ti_probe()
198 	if (IS_ERR(am62->usb2_refclk)) {  in dwc3_ti_probe()
200 		return PTR_ERR(am62->usb2_refclk);  in dwc3_ti_probe()
204 	rate = clk_get_rate(am62->usb2_refclk);  in dwc3_ti_probe()
213 		return -EINVAL;  in dwc3_ti_probe()
216 	am62->rate_code = i;  in dwc3_ti_probe()
219 	ret = phy_syscon_pll_refclk(am62);  in dwc3_ti_probe()
224 	am62->vbus_divider = device_property_read_bool(dev, "ti,vbus-divider");  in dwc3_ti_probe()
225 	reg = dwc3_ti_readl(am62, USBSS_PHY_CONFIG);  in dwc3_ti_probe()
226 	if (am62->vbus_divider)  in dwc3_ti_probe()
229 	dwc3_ti_writel(am62, USBSS_PHY_CONFIG, reg);  in dwc3_ti_probe()
237 	clk_prepare_enable(am62->usb2_refclk);  in dwc3_ti_probe()
247 	reg = dwc3_ti_readl(am62, USBSS_MODE_CONTROL);  in dwc3_ti_probe()
249 	dwc3_ti_writel(am62, USBSS_MODE_CONTROL, reg);  in dwc3_ti_probe()
265 	clk_disable_unprepare(am62->usb2_refclk);  in dwc3_ti_probe()
273 	struct device *dev = &pdev->dev;  in dwc3_ti_remove()
274 	struct dwc3_am62 *am62 = platform_get_drvdata(pdev);  in dwc3_ti_remove()  local
282 	reg = dwc3_ti_readl(am62, USBSS_MODE_CONTROL);  in dwc3_ti_remove()
284 	dwc3_ti_writel(am62, USBSS_MODE_CONTROL, reg);  in dwc3_ti_remove()
295 	struct dwc3_am62 *am62 = dev_get_drvdata(dev);  in dwc3_ti_suspend_common()  local
299 		reg = dwc3_ti_readl(am62, USBSS_CORE_STAT);  in dwc3_ti_suspend_common()
303 		reg = dwc3_ti_readl(am62, USBSS_WAKEUP_CONFIG);  in dwc3_ti_suspend_common()
310 			 * and in U2/L3 state else it causes spurious wake-up.  in dwc3_ti_suspend_common()
313 		dwc3_ti_writel(am62, USBSS_WAKEUP_CONFIG, reg);  in dwc3_ti_suspend_common()
315 		dwc3_ti_writel(am62, USBSS_WAKEUP_STAT, USBSS_WAKEUP_STAT_CLR);  in dwc3_ti_suspend_common()
318 	clk_disable_unprepare(am62->usb2_refclk);  in dwc3_ti_suspend_common()
325 	struct dwc3_am62 *am62 = dev_get_drvdata(dev);  in dwc3_ti_resume_common()  local
328 	clk_prepare_enable(am62->usb2_refclk);  in dwc3_ti_resume_common()
332 		dwc3_ti_writel(am62, USBSS_WAKEUP_CONFIG, USBSS_WAKEUP_CFG_NONE);  in dwc3_ti_resume_common()
335 	reg = dwc3_ti_readl(am62, USBSS_WAKEUP_STAT);  in dwc3_ti_resume_common()
336 	am62->wakeup_stat = reg;  in dwc3_ti_resume_common()
350 	{ .compatible = "ti,am62-usb"},
359 		.name	= "dwc3-am62",
367 MODULE_ALIAS("platform:dwc3-am62");
368 MODULE_AUTHOR("Aswath Govindraju <a-govindraju@ti.com>");