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
12 #include <linux/mfd/syscon.h>
57 /* WAKEUP CONFIG register bits */
70 /* WAKEUP STAT register bits */
116 	struct regmap *syscon;  member
140 	return readl((am62->usbss) + offset);  in dwc3_ti_readl()
145 	writel(value, (am62->usbss) + offset);  in dwc3_ti_writel()
150 	struct device *dev = am62->dev;  in phy_syscon_pll_refclk()
151 	struct device_node *node = dev->of_node;  in phy_syscon_pll_refclk()
153 	struct regmap *syscon;  in phy_syscon_pll_refclk()  local
156 	syscon = syscon_regmap_lookup_by_phandle(node, "ti,syscon-phy-pll-refclk");  in phy_syscon_pll_refclk()
157 	if (IS_ERR(syscon)) {  in phy_syscon_pll_refclk()
158 		dev_err(dev, "unable to get ti,syscon-phy-pll-refclk regmap\n");  in phy_syscon_pll_refclk()
159 		return PTR_ERR(syscon);  in phy_syscon_pll_refclk()
162 	am62->syscon = syscon;  in phy_syscon_pll_refclk()
164 	ret = of_parse_phandle_with_fixed_args(node, "ti,syscon-phy-pll-refclk", 1,  in phy_syscon_pll_refclk()
169 	am62->offset = args.args[0];  in phy_syscon_pll_refclk()
172 	ret = regmap_update_bits(am62->syscon, am62->offset, PHY_CORE_VOLTAGE_MASK, 0);  in phy_syscon_pll_refclk()
178 	ret = regmap_update_bits(am62->syscon, am62->offset, PHY_PLL_REFCLK_MASK, am62->rate_code);  in phy_syscon_pll_refclk()
189 	struct device *dev = &pdev->dev;  in dwc3_ti_probe()
190 	struct device_node *node = pdev->dev.of_node;  in dwc3_ti_probe()
199 		return -ENOMEM;  in dwc3_ti_probe()
201 	am62->dev = dev;  in dwc3_ti_probe()
204 	am62->usbss = devm_platform_ioremap_resource(pdev, 0);  in dwc3_ti_probe()
205 	if (IS_ERR(am62->usbss)) {  in dwc3_ti_probe()
207 		return PTR_ERR(am62->usbss);  in dwc3_ti_probe()
210 	am62->usb2_refclk = devm_clk_get(dev, "ref");  in dwc3_ti_probe()
211 	if (IS_ERR(am62->usb2_refclk)) {  in dwc3_ti_probe()
213 		return PTR_ERR(am62->usb2_refclk);  in dwc3_ti_probe()
217 	rate = clk_get_rate(am62->usb2_refclk);  in dwc3_ti_probe()
226 		return -EINVAL;  in dwc3_ti_probe()
229 	am62->rate_code = i;  in dwc3_ti_probe()
231 	/* Read the syscon property and set the rate code */  in dwc3_ti_probe()
248 	am62->vbus_divider = device_property_read_bool(dev, "ti,vbus-divider");  in dwc3_ti_probe()
250 	if (am62->vbus_divider)  in dwc3_ti_probe()
261 	clk_prepare_enable(am62->usb2_refclk);  in dwc3_ti_probe()
275 	/* Device has capability to wakeup system from sleep */  in dwc3_ti_probe()
279 		dev_err(dev, "couldn't enable device as a wakeup source: %d\n", ret);  in dwc3_ti_probe()
289 	clk_disable_unprepare(am62->usb2_refclk);  in dwc3_ti_probe()
297 	struct device *dev = &pdev->dev;  in dwc3_ti_remove()
325 		/* Set wakeup config enable bits */  in dwc3_ti_suspend_common()
333 			 * and in U2/L3 state else it causes spurious wake-up.  in dwc3_ti_suspend_common()
337 		/* clear wakeup status so we know what caused the wake up */  in dwc3_ti_suspend_common()
341 	clk_disable_unprepare(am62->usb2_refclk);  in dwc3_ti_suspend_common()
351 	clk_prepare_enable(am62->usb2_refclk);  in dwc3_ti_resume_common()
354 		/* Clear wakeup config enable bits */  in dwc3_ti_resume_common()
359 	am62->wakeup_stat = reg;  in dwc3_ti_resume_common()
373 	{ .compatible = "ti,am62-usb"},
382 		.name	= "dwc3-am62",
390 MODULE_ALIAS("platform:dwc3-am62");
391 MODULE_AUTHOR("Aswath Govindraju <a-govindraju@ti.com>");