// SPDX-License-Identifier: GPL-2.0+ /* * dwc3-st.c Support for dwc3 platform devices on ST Microelectronics platforms * * This is a small driver for the dwc3 to provide the glue logic * to configure the controller. Tested on STi platforms. * * Copyright (C) 2014 Stmicroelectronics * * Author: Giuseppe Cavallaro <[email protected]> * Contributors: Aymen Bouattay <[email protected]> * Peter Griffin <[email protected]> * * Inspired by dwc3-omap.c and dwc3-exynos.c. */ #include <linux/delay.h> #include <linux/interrupt.h> #include <linux/io.h> #include <linux/ioport.h> #include <linux/kernel.h> #include <linux/mfd/syscon.h> #include <linux/module.h> #include <linux/of.h> #include <linux/of_platform.h> #include <linux/platform_device.h> #include <linux/slab.h> #include <linux/regmap.h> #include <linux/reset.h> #include <linux/pinctrl/consumer.h> #include <linux/usb/of.h> #include "core.h" #include "io.h" /* glue registers */ #define CLKRST_CTRL … #define AUX_CLK_EN … #define SW_PIPEW_RESET_N … #define EXT_CFG_RESET_N … /* * 1'b0 : The host controller complies with the xHCI revision 0.96 * 1'b1 : The host controller complies with the xHCI revision 1.0 */ #define XHCI_REVISION … #define USB2_VBUS_MNGMNT_SEL1 … /* * For all fields in USB2_VBUS_MNGMNT_SEL1 * 2’b00 : Override value from Reg 0x30 is selected * 2’b01 : utmiotg_<signal_name> from usb3_top is selected * 2’b10 : pipew_<signal_name> from PIPEW instance is selected * 2’b11 : value is 1'b0 */ #define USB2_VBUS_REG30 … #define USB2_VBUS_UTMIOTG … #define USB2_VBUS_PIPEW … #define USB2_VBUS_ZERO … #define SEL_OVERRIDE_VBUSVALID(n) … #define SEL_OVERRIDE_POWERPRESENT(n) … #define SEL_OVERRIDE_BVALID(n) … /* Static DRD configuration */ #define USB3_CONTROL_MASK … #define USB3_DEVICE_NOT_HOST … #define USB3_FORCE_VBUSVALID … #define USB3_DELAY_VBUSVALID … #define USB3_SEL_FORCE_OPMODE … #define USB3_FORCE_OPMODE(n) … #define USB3_SEL_FORCE_DPPULLDOWN2 … #define USB3_FORCE_DPPULLDOWN2 … #define USB3_SEL_FORCE_DMPULLDOWN2 … #define USB3_FORCE_DMPULLDOWN2 … /** * struct st_dwc3 - dwc3-st driver private structure * @dev: device pointer * @glue_base: ioaddr for the glue registers * @regmap: regmap pointer for getting syscfg * @syscfg_reg_off: usb syscfg control offset * @dr_mode: drd static host/device config * @rstc_pwrdn: rest controller for powerdown signal * @rstc_rst: reset controller for softreset signal */ struct st_dwc3 { … }; static inline u32 st_dwc3_readl(void __iomem *base, u32 offset) { … } static inline void st_dwc3_writel(void __iomem *base, u32 offset, u32 value) { … } /** * st_dwc3_drd_init: program the port * @dwc3_data: driver private structure * Description: this function is to program the port as either host or device * according to the static configuration passed from devicetree. * OTG and dual role are not yet supported! */ static int st_dwc3_drd_init(struct st_dwc3 *dwc3_data) { … } /** * st_dwc3_init: init the controller via glue logic * @dwc3_data: driver private structure */ static void st_dwc3_init(struct st_dwc3 *dwc3_data) { … } static int st_dwc3_probe(struct platform_device *pdev) { … } static void st_dwc3_remove(struct platform_device *pdev) { … } #ifdef CONFIG_PM_SLEEP static int st_dwc3_suspend(struct device *dev) { … } static int st_dwc3_resume(struct device *dev) { … } #endif /* CONFIG_PM_SLEEP */ static SIMPLE_DEV_PM_OPS(st_dwc3_dev_pm_ops, st_dwc3_suspend, st_dwc3_resume); static const struct of_device_id st_dwc3_match[] = …; MODULE_DEVICE_TABLE(of, st_dwc3_match); static struct platform_driver st_dwc3_driver = …; module_platform_driver(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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