1 // SPDX-License-Identifier: GPL-2.0
3  * ulpi.c - DesignWare USB3 Controller's ULPI PHY interface
24 static int dwc3_ulpi_busyloop(struct dwc3 *dwc, u8 addr, bool read)  in dwc3_ulpi_busyloop()  argument
28 	u32 reg;  in dwc3_ulpi_busyloop()  local
30 	if (addr >= ULPI_EXT_VENDOR_SPECIFIC)  in dwc3_ulpi_busyloop()
36 	reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(0));  in dwc3_ulpi_busyloop()
37 	if (reg & DWC3_GUSB2PHYCFG_SUSPHY)  in dwc3_ulpi_busyloop()
40 	while (count--) {  in dwc3_ulpi_busyloop()
42 		reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYACC(0));  in dwc3_ulpi_busyloop()
43 		if (reg & DWC3_GUSB2PHYACC_DONE)  in dwc3_ulpi_busyloop()
48 	return -ETIMEDOUT;  in dwc3_ulpi_busyloop()
51 static int dwc3_ulpi_read(struct device *dev, u8 addr)  in dwc3_ulpi_read()  argument
54 	u32 reg;  in dwc3_ulpi_read()  local
57 	reg = DWC3_GUSB2PHYACC_NEWREGREQ | DWC3_ULPI_ADDR(addr);  in dwc3_ulpi_read()
58 	dwc3_writel(dwc->regs, DWC3_GUSB2PHYACC(0), reg);  in dwc3_ulpi_read()
60 	ret = dwc3_ulpi_busyloop(dwc, addr, true);  in dwc3_ulpi_read()
64 	reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYACC(0));  in dwc3_ulpi_read()
66 	return DWC3_GUSB2PHYACC_DATA(reg);  in dwc3_ulpi_read()
69 static int dwc3_ulpi_write(struct device *dev, u8 addr, u8 val)  in dwc3_ulpi_write()  argument
72 	u32 reg;  in dwc3_ulpi_write()  local
74 	reg = DWC3_GUSB2PHYACC_NEWREGREQ | DWC3_ULPI_ADDR(addr);  in dwc3_ulpi_write()
75 	reg |= DWC3_GUSB2PHYACC_WRITE | val;  in dwc3_ulpi_write()
76 	dwc3_writel(dwc->regs, DWC3_GUSB2PHYACC(0), reg);  in dwc3_ulpi_write()
78 	return dwc3_ulpi_busyloop(dwc, addr, false);  in dwc3_ulpi_write()
89 	dwc->ulpi = ulpi_register_interface(dwc->dev, &dwc3_ulpi_ops);  in dwc3_ulpi_init()
90 	if (IS_ERR(dwc->ulpi)) {  in dwc3_ulpi_init()
91 		dev_err(dwc->dev, "failed to register ULPI interface");  in dwc3_ulpi_init()
92 		return PTR_ERR(dwc->ulpi);  in dwc3_ulpi_init()
100 	if (dwc->ulpi) {  in dwc3_ulpi_exit()
101 		ulpi_unregister_interface(dwc->ulpi);  in dwc3_ulpi_exit()
102 		dwc->ulpi = NULL;  in dwc3_ulpi_exit()