1 // SPDX-License-Identifier: GPL-2.0+
3  * dwc3-st.c Support for dwc3 platform devices on ST Microelectronics platforms
5  * This is a small driver for the dwc3 to provide the glue logic
14  * Inspired by dwc3-omap.c and dwc3-exynos.c.
31 #include <linux/usb/of.h>
36 /* glue registers */
78  * struct st_dwc3 - dwc3-st driver private structure
80  * @glue_base:		ioaddr for the glue registers
82  * @syscfg_reg_off:	usb syscfg control offset
120 	err = regmap_read(dwc3_data->regmap, dwc3_data->syscfg_reg_off, &val);  in st_dwc3_drd_init()
126 	switch (dwc3_data->dr_mode) {  in st_dwc3_drd_init()
161 		dev_err(dwc3_data->dev, "Unsupported mode of operation %d\n",  in st_dwc3_drd_init()
162 			dwc3_data->dr_mode);  in st_dwc3_drd_init()
163 		return -EINVAL;  in st_dwc3_drd_init()
166 	return regmap_write(dwc3_data->regmap, dwc3_data->syscfg_reg_off, val);  in st_dwc3_drd_init()
170  * st_dwc3_init: init the controller via glue logic
175 	u32 reg = st_dwc3_readl(dwc3_data->glue_base, CLKRST_CTRL);  in st_dwc3_init()
179 	st_dwc3_writel(dwc3_data->glue_base, CLKRST_CTRL, reg);  in st_dwc3_init()
182 	reg = st_dwc3_readl(dwc3_data->glue_base, USB2_VBUS_MNGMNT_SEL1);  in st_dwc3_init()
188 	st_dwc3_writel(dwc3_data->glue_base, USB2_VBUS_MNGMNT_SEL1, reg);  in st_dwc3_init()
190 	reg = st_dwc3_readl(dwc3_data->glue_base, CLKRST_CTRL);  in st_dwc3_init()
192 	st_dwc3_writel(dwc3_data->glue_base, CLKRST_CTRL, reg);  in st_dwc3_init()
199 	struct device *dev = &pdev->dev;  in st_dwc3_probe()
200 	struct device_node *node = dev->of_node, *child;  in st_dwc3_probe()
207 		return -ENOMEM;  in st_dwc3_probe()
209 	dwc3_data->glue_base =  in st_dwc3_probe()
210 		devm_platform_ioremap_resource_byname(pdev, "reg-glue");  in st_dwc3_probe()
211 	if (IS_ERR(dwc3_data->glue_base))  in st_dwc3_probe()
212 		return PTR_ERR(dwc3_data->glue_base);  in st_dwc3_probe()
218 	dwc3_data->dev = dev;  in st_dwc3_probe()
219 	dwc3_data->regmap = regmap;  in st_dwc3_probe()
221 	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "syscfg-reg");  in st_dwc3_probe()
223 		ret = -ENXIO;  in st_dwc3_probe()
227 	dwc3_data->syscfg_reg_off = res->start;  in st_dwc3_probe()
229 	dev_vdbg(&pdev->dev, "glue-logic addr 0x%pK, syscfg-reg offset 0x%x\n",  in st_dwc3_probe()
230 		 dwc3_data->glue_base, dwc3_data->syscfg_reg_off);  in st_dwc3_probe()
232 	dwc3_data->rstc_pwrdn =  in st_dwc3_probe()
234 	if (IS_ERR(dwc3_data->rstc_pwrdn)) {  in st_dwc3_probe()
235 		dev_err(&pdev->dev, "could not get power controller\n");  in st_dwc3_probe()
236 		ret = PTR_ERR(dwc3_data->rstc_pwrdn);  in st_dwc3_probe()
241 	reset_control_deassert(dwc3_data->rstc_pwrdn);  in st_dwc3_probe()
243 	dwc3_data->rstc_rst =  in st_dwc3_probe()
245 	if (IS_ERR(dwc3_data->rstc_rst)) {  in st_dwc3_probe()
246 		dev_err(&pdev->dev, "could not get reset controller\n");  in st_dwc3_probe()
247 		ret = PTR_ERR(dwc3_data->rstc_rst);  in st_dwc3_probe()
252 	reset_control_deassert(dwc3_data->rstc_rst);  in st_dwc3_probe()
256 		dev_err(&pdev->dev, "failed to find dwc3 core node\n");  in st_dwc3_probe()
257 		ret = -ENODEV;  in st_dwc3_probe()
271 		ret = -ENODEV;  in st_dwc3_probe()
275 	dwc3_data->dr_mode = usb_get_dr_mode(&child_pdev->dev);  in st_dwc3_probe()
280 	 * Configure the USB port as device or host according to the static  in st_dwc3_probe()
291 	/* ST glue logic init */  in st_dwc3_probe()
300 	reset_control_assert(dwc3_data->rstc_rst);  in st_dwc3_probe()
302 	reset_control_assert(dwc3_data->rstc_pwrdn);  in st_dwc3_probe()
312 	of_platform_depopulate(&pdev->dev);  in st_dwc3_remove()
314 	reset_control_assert(dwc3_data->rstc_pwrdn);  in st_dwc3_remove()
315 	reset_control_assert(dwc3_data->rstc_rst);  in st_dwc3_remove()
325 	reset_control_assert(dwc3_data->rstc_pwrdn);  in st_dwc3_suspend()
326 	reset_control_assert(dwc3_data->rstc_rst);  in st_dwc3_suspend()
340 	reset_control_deassert(dwc3_data->rstc_pwrdn);  in st_dwc3_resume()
341 	reset_control_deassert(dwc3_data->rstc_rst);  in st_dwc3_resume()
349 	/* ST glue logic init */  in st_dwc3_resume()
359 	{ .compatible = "st,stih407-dwc3" },
369 		.name = "usb-st-dwc3",
378 MODULE_DESCRIPTION("DesignWare USB3 STi Glue Layer");