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 */
104 /* USB PHY2 register offsets */
142 static inline u32 dwc3_ti_readl(struct dwc3_am62 *am62, u32 offset)  in dwc3_ti_readl()  argument
144 	return readl((am62->usbss) + offset);  in dwc3_ti_readl()
147 static inline void dwc3_ti_writel(struct dwc3_am62 *am62, u32 offset, u32 value)  in dwc3_ti_writel()  argument
149 	writel(value, (am62->usbss) + offset);  in dwc3_ti_writel()
152 static int phy_syscon_pll_refclk(struct dwc3_am62 *am62)  in phy_syscon_pll_refclk()  argument
154 	struct device *dev = am62->dev;  in phy_syscon_pll_refclk()
155 	struct device_node *node = dev->of_node;  in phy_syscon_pll_refclk()
160 	syscon = syscon_regmap_lookup_by_phandle(node, "ti,syscon-phy-pll-refclk");  in phy_syscon_pll_refclk()
162 		dev_err(dev, "unable to get ti,syscon-phy-pll-refclk regmap\n");  in phy_syscon_pll_refclk()
166 	am62->syscon = syscon;  in phy_syscon_pll_refclk()
168 	ret = of_parse_phandle_with_fixed_args(node, "ti,syscon-phy-pll-refclk", 1,  in phy_syscon_pll_refclk()
174 	am62->offset = args.args[0];  in phy_syscon_pll_refclk()
177 	ret = regmap_update_bits(am62->syscon, am62->offset, PHY_CORE_VOLTAGE_MASK, 0);  in phy_syscon_pll_refclk()
183 	ret = regmap_update_bits(am62->syscon, am62->offset, PHY_PLL_REFCLK_MASK, am62->rate_code);  in phy_syscon_pll_refclk()
192 static int dwc3_ti_init(struct dwc3_am62 *am62)  in dwc3_ti_init()  argument
198 	ret = phy_syscon_pll_refclk(am62);  in dwc3_ti_init()
203 	if (am62->phy_regs) {  in dwc3_ti_init()
204 		reg = readl(am62->phy_regs + USB_PHY_PLL_REG12);  in dwc3_ti_init()
206 		writel(reg, am62->phy_regs + USB_PHY_PLL_REG12);  in dwc3_ti_init()
210 	reg = dwc3_ti_readl(am62, USBSS_PHY_CONFIG);  in dwc3_ti_init()
211 	if (am62->vbus_divider)  in dwc3_ti_init()
214 	dwc3_ti_writel(am62, USBSS_PHY_CONFIG, reg);  in dwc3_ti_init()
216 	clk_prepare_enable(am62->usb2_refclk);  in dwc3_ti_init()
219 	reg = dwc3_ti_readl(am62, USBSS_MODE_CONTROL);  in dwc3_ti_init()
221 	dwc3_ti_writel(am62, USBSS_MODE_CONTROL, reg);  in dwc3_ti_init()
228 	struct device *dev = &pdev->dev;  in dwc3_ti_probe()
229 	struct device_node *node = pdev->dev.of_node;  in dwc3_ti_probe()
230 	struct dwc3_am62 *am62;  in dwc3_ti_probe()  local
234 	am62 = devm_kzalloc(dev, sizeof(*am62), GFP_KERNEL);  in dwc3_ti_probe()
235 	if (!am62)  in dwc3_ti_probe()
236 		return -ENOMEM;  in dwc3_ti_probe()
238 	am62->dev = dev;  in dwc3_ti_probe()
239 	platform_set_drvdata(pdev, am62);  in dwc3_ti_probe()
241 	am62->usbss = devm_platform_ioremap_resource(pdev, 0);  in dwc3_ti_probe()
242 	if (IS_ERR(am62->usbss)) {  in dwc3_ti_probe()
244 		return PTR_ERR(am62->usbss);  in dwc3_ti_probe()
247 	am62->usb2_refclk = devm_clk_get(dev, "ref");  in dwc3_ti_probe()
248 	if (IS_ERR(am62->usb2_refclk)) {  in dwc3_ti_probe()
250 		return PTR_ERR(am62->usb2_refclk);  in dwc3_ti_probe()
254 	rate = clk_get_rate(am62->usb2_refclk);  in dwc3_ti_probe()
263 		return -EINVAL;  in dwc3_ti_probe()
266 	am62->rate_code = i;  in dwc3_ti_probe()
268 	am62->phy_regs = devm_platform_ioremap_resource(pdev, 1);  in dwc3_ti_probe()
269 	if (IS_ERR(am62->phy_regs)) {  in dwc3_ti_probe()
271 		am62->phy_regs = NULL;  in dwc3_ti_probe()
274 	am62->vbus_divider = device_property_read_bool(dev, "ti,vbus-divider");  in dwc3_ti_probe()
276 	ret = dwc3_ti_init(am62);  in dwc3_ti_probe()
308 	clk_disable_unprepare(am62->usb2_refclk);  in dwc3_ti_probe()
316 	struct device *dev = &pdev->dev;  in dwc3_ti_remove()
317 	struct dwc3_am62 *am62 = platform_get_drvdata(pdev);  in dwc3_ti_remove()  local
325 	reg = dwc3_ti_readl(am62, USBSS_MODE_CONTROL);  in dwc3_ti_remove()
327 	dwc3_ti_writel(am62, USBSS_MODE_CONTROL, reg);  in dwc3_ti_remove()
338 	struct dwc3_am62 *am62 = dev_get_drvdata(dev);  in dwc3_ti_suspend_common()  local
342 		reg = dwc3_ti_readl(am62, USBSS_CORE_STAT);  in dwc3_ti_suspend_common()
346 		reg = dwc3_ti_readl(am62, USBSS_WAKEUP_CONFIG);  in dwc3_ti_suspend_common()
353 			 * and in U2/L3 state else it causes spurious wake-up.  in dwc3_ti_suspend_common()
356 		dwc3_ti_writel(am62, USBSS_WAKEUP_CONFIG, reg);  in dwc3_ti_suspend_common()
358 		dwc3_ti_writel(am62, USBSS_WAKEUP_STAT, USBSS_WAKEUP_STAT_CLR);  in dwc3_ti_suspend_common()
362 	dwc3_ti_writel(am62, USBSS_DEBUG_CFG, USBSS_DEBUG_CFG_DISABLED);  in dwc3_ti_suspend_common()
364 	clk_disable_unprepare(am62->usb2_refclk);  in dwc3_ti_suspend_common()
371 	struct dwc3_am62 *am62 = dev_get_drvdata(dev);  in dwc3_ti_resume_common()  local
374 	reg = dwc3_ti_readl(am62, USBSS_DEBUG_CFG);  in dwc3_ti_resume_common()
377 		dwc3_ti_init(am62);  in dwc3_ti_resume_common()
379 		dwc3_ti_writel(am62, USBSS_DEBUG_CFG, USBSS_DEBUG_CFG_OFF);  in dwc3_ti_resume_common()
380 		clk_prepare_enable(am62->usb2_refclk);  in dwc3_ti_resume_common()
385 		dwc3_ti_writel(am62, USBSS_WAKEUP_CONFIG, USBSS_WAKEUP_CFG_NONE);  in dwc3_ti_resume_common()
388 	reg = dwc3_ti_readl(am62, USBSS_WAKEUP_STAT);  in dwc3_ti_resume_common()
389 	am62->wakeup_stat = reg;  in dwc3_ti_resume_common()
403 	{ .compatible = "ti,am62-usb"},
412 		.name	= "dwc3-am62",
420 MODULE_ALIAS("platform:dwc3-am62");
421 MODULE_AUTHOR("Aswath Govindraju <a-[email protected]>");