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
57 /* WAKEUP CONFIG register bits */
70 /* WAKEUP STAT register bits */
100 /* Mask for PHY PLL REFCLK */
134 	return readl((am62->usbss) + offset);  in dwc3_ti_readl()
139 	writel(value, (am62->usbss) + offset);  in dwc3_ti_writel()
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()
163 	am62->offset = args.args[0];  in phy_syscon_pll_refclk()
165 	ret = regmap_update_bits(am62->syscon, am62->offset, PHY_PLL_REFCLK_MASK, am62->rate_code);  in phy_syscon_pll_refclk()
176 	struct device *dev = &pdev->dev;  in dwc3_ti_probe()
177 	struct device_node *node = pdev->dev.of_node;  in dwc3_ti_probe()
185 		return -ENOMEM;  in dwc3_ti_probe()
187 	am62->dev = dev;  in dwc3_ti_probe()
190 	am62->usbss = devm_platform_ioremap_resource(pdev, 0);  in dwc3_ti_probe()
191 	if (IS_ERR(am62->usbss)) {  in dwc3_ti_probe()
193 		return PTR_ERR(am62->usbss);  in dwc3_ti_probe()
196 	am62->usb2_refclk = devm_clk_get(dev, "ref");  in dwc3_ti_probe()
197 	if (IS_ERR(am62->usb2_refclk)) {  in dwc3_ti_probe()
199 		return PTR_ERR(am62->usb2_refclk);  in dwc3_ti_probe()
203 	rate = clk_get_rate(am62->usb2_refclk);  in dwc3_ti_probe()
212 		return -EINVAL;  in dwc3_ti_probe()
215 	am62->rate_code = i;  in dwc3_ti_probe()
223 	am62->vbus_divider = device_property_read_bool(dev, "ti,vbus-divider");  in dwc3_ti_probe()
225 	if (am62->vbus_divider)  in dwc3_ti_probe()
236 	clk_prepare_enable(am62->usb2_refclk);  in dwc3_ti_probe()
245 	/* Set mode valid bit to indicate role is valid */  in dwc3_ti_probe()
250 	/* Device has capability to wakeup system from sleep */  in dwc3_ti_probe()
254 		dev_err(dev, "couldn't enable device as a wakeup source: %d\n", ret);  in dwc3_ti_probe()
264 	clk_disable_unprepare(am62->usb2_refclk);  in dwc3_ti_probe()
280 	struct device *dev = &pdev->dev;  in dwc3_ti_remove()
286 	/* Clear mode valid bit */  in dwc3_ti_remove()
292 	clk_disable_unprepare(am62->usb2_refclk);  in dwc3_ti_remove()
307 		/* Set wakeup config enable bits */  in dwc3_ti_suspend_common()
315 			 * and in U2/L3 state else it causes spurious wake-up.  in dwc3_ti_suspend_common()
319 		/* clear wakeup status so we know what caused the wake up */  in dwc3_ti_suspend_common()
323 	clk_disable_unprepare(am62->usb2_refclk);  in dwc3_ti_suspend_common()
333 	clk_prepare_enable(am62->usb2_refclk);  in dwc3_ti_resume_common()
336 		/* Clear wakeup config enable bits */  in dwc3_ti_resume_common()
341 	am62->wakeup_stat = reg;  in dwc3_ti_resume_common()
355 	{ .compatible = "ti,am62-usb"},
364 		.name	= "dwc3-am62",
372 MODULE_ALIAS("platform:dwc3-am62");
373 MODULE_AUTHOR("Aswath Govindraju <a-govindraju@ti.com>");