diff options
Diffstat (limited to 'drivers/usb/dwc3/dwc3-st.c')
| -rw-r--r-- | drivers/usb/dwc3/dwc3-st.c | 367 |
1 files changed, 0 insertions, 367 deletions
diff --git a/drivers/usb/dwc3/dwc3-st.c b/drivers/usb/dwc3/dwc3-st.c deleted file mode 100644 index 4a1a543..0000000 --- a/drivers/usb/dwc3/dwc3-st.c +++ /dev/null @@ -1,367 +0,0 @@ -/** - * 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 <peppe.cavallaro@st.com> - * Contributors: Aymen Bouattay <aymen.bouattay@st.com> - * Peter Griffin <peter.griffin@linaro.org> - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * 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/usb/of.h> - -#include "core.h" -#include "io.h" - -/* glue registers */ -#define CLKRST_CTRL 0x00 -#define AUX_CLK_EN BIT(0) -#define SW_PIPEW_RESET_N BIT(4) -#define EXT_CFG_RESET_N BIT(8) -/* - * 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 BIT(12) - -#define USB2_VBUS_MNGMNT_SEL1 0x2C -/* - * 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 0x0 -#define USB2_VBUS_UTMIOTG 0x1 -#define USB2_VBUS_PIPEW 0x2 -#define USB2_VBUS_ZERO 0x3 - -#define SEL_OVERRIDE_VBUSVALID(n) (n << 0) -#define SEL_OVERRIDE_POWERPRESENT(n) (n << 4) -#define SEL_OVERRIDE_BVALID(n) (n << 8) - -/* Static DRD configuration */ -#define USB3_CONTROL_MASK 0xf77 - -#define USB3_DEVICE_NOT_HOST BIT(0) -#define USB3_FORCE_VBUSVALID BIT(1) -#define USB3_DELAY_VBUSVALID BIT(2) -#define USB3_SEL_FORCE_OPMODE BIT(4) -#define USB3_FORCE_OPMODE(n) (n << 5) -#define USB3_SEL_FORCE_DPPULLDOWN2 BIT(8) -#define USB3_FORCE_DPPULLDOWN2 BIT(9) -#define USB3_SEL_FORCE_DMPULLDOWN2 BIT(10) -#define USB3_FORCE_DMPULLDOWN2 BIT(11) - -/** - * 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 { - struct device *dev; - void __iomem *glue_base; - struct regmap *regmap; - int syscfg_reg_off; - enum usb_dr_mode dr_mode; - struct reset_control *rstc_pwrdn; - struct reset_control *rstc_rst; -}; - -static inline u32 st_dwc3_readl(void __iomem *base, u32 offset) -{ - return readl_relaxed(base + offset); -} - -static inline void st_dwc3_writel(void __iomem *base, u32 offset, u32 value) -{ - writel_relaxed(value, base + offset); -} - -/** - * 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) -{ - u32 val; - int err; - - err = regmap_read(dwc3_data->regmap, dwc3_data->syscfg_reg_off, &val); - if (err) - return err; - - val &= USB3_CONTROL_MASK; - - switch (dwc3_data->dr_mode) { - case USB_DR_MODE_PERIPHERAL: - - val &= ~(USB3_FORCE_VBUSVALID | USB3_DELAY_VBUSVALID - | USB3_SEL_FORCE_OPMODE | USB3_FORCE_OPMODE(0x3) - | USB3_SEL_FORCE_DPPULLDOWN2 | USB3_FORCE_DPPULLDOWN2 - | USB3_SEL_FORCE_DMPULLDOWN2 | USB3_FORCE_DMPULLDOWN2); - - val |= USB3_DEVICE_NOT_HOST; - - dev_dbg(dwc3_data->dev, "Configuring as Device\n"); - break; - - case USB_DR_MODE_HOST: - - val &= ~(USB3_DEVICE_NOT_HOST | USB3_FORCE_VBUSVALID - | USB3_SEL_FORCE_OPMODE | USB3_FORCE_OPMODE(0x3) - | USB3_SEL_FORCE_DPPULLDOWN2 | USB3_FORCE_DPPULLDOWN2 - | USB3_SEL_FORCE_DMPULLDOWN2 | USB3_FORCE_DMPULLDOWN2); - - /* - * USB3_DELAY_VBUSVALID is ANDed with USB_C_VBUSVALID. Thus, - * when set to ‘0‘, it can delay the arrival of VBUSVALID - * information to VBUSVLDEXT2 input of the pico PHY. - * We don't want to do that so we set the bit to '1'. - */ - - val |= USB3_DELAY_VBUSVALID; - - dev_dbg(dwc3_data->dev, "Configuring as Host\n"); - break; - - default: - dev_err(dwc3_data->dev, "Unsupported mode of operation %d\n", - dwc3_data->dr_mode); - return -EINVAL; - } - - return regmap_write(dwc3_data->regmap, dwc3_data->syscfg_reg_off, val); -} - -/** - * st_dwc3_init: init the controller via glue logic - * @dwc3_data: driver private structure - */ -static void st_dwc3_init(struct st_dwc3 *dwc3_data) -{ - u32 reg = st_dwc3_readl(dwc3_data->glue_base, CLKRST_CTRL); - - reg |= AUX_CLK_EN | EXT_CFG_RESET_N | XHCI_REVISION; - reg &= ~SW_PIPEW_RESET_N; - st_dwc3_writel(dwc3_data->glue_base, CLKRST_CTRL, reg); - - /* configure mux for vbus, powerpresent and bvalid signals */ - reg = st_dwc3_readl(dwc3_data->glue_base, USB2_VBUS_MNGMNT_SEL1); - - reg |= SEL_OVERRIDE_VBUSVALID(USB2_VBUS_UTMIOTG) | - SEL_OVERRIDE_POWERPRESENT(USB2_VBUS_UTMIOTG) | - SEL_OVERRIDE_BVALID(USB2_VBUS_UTMIOTG); - - st_dwc3_writel(dwc3_data->glue_base, USB2_VBUS_MNGMNT_SEL1, reg); - - reg = st_dwc3_readl(dwc3_data->glue_base, CLKRST_CTRL); - reg |= SW_PIPEW_RESET_N; - st_dwc3_writel(dwc3_data->glue_base, CLKRST_CTRL, reg); -} - -static int st_dwc3_probe(struct platform_device *pdev) -{ - struct st_dwc3 *dwc3_data; - struct resource *res; - struct device *dev = &pdev->dev; - struct device_node *node = dev->of_node, *child; - struct regmap *regmap; - int ret; - - dwc3_data = devm_kzalloc(dev, sizeof(*dwc3_data), GFP_KERNEL); - if (!dwc3_data) - return -ENOMEM; - - res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "reg-glue"); - dwc3_data->glue_base = devm_ioremap_resource(dev, res); - if (IS_ERR(dwc3_data->glue_base)) - return PTR_ERR(dwc3_data->glue_base); - - regmap = syscon_regmap_lookup_by_phandle(node, "st,syscfg"); - if (IS_ERR(regmap)) - return PTR_ERR(regmap); - - dma_set_coherent_mask(dev, dev->coherent_dma_mask); - dwc3_data->dev = dev; - dwc3_data->regmap = regmap; - - res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "syscfg-reg"); - if (!res) { - ret = -ENXIO; - goto undo_platform_dev_alloc; - } - - dwc3_data->syscfg_reg_off = res->start; - - dev_vdbg(&pdev->dev, "glue-logic addr 0x%p, syscfg-reg offset 0x%x\n", - dwc3_data->glue_base, dwc3_data->syscfg_reg_off); - - dwc3_data->rstc_pwrdn = devm_reset_control_get(dev, "powerdown"); - if (IS_ERR(dwc3_data->rstc_pwrdn)) { - dev_err(&pdev->dev, "could not get power controller\n"); - ret = PTR_ERR(dwc3_data->rstc_pwrdn); - goto undo_platform_dev_alloc; - } - - /* Manage PowerDown */ - reset_control_deassert(dwc3_data->rstc_pwrdn); - - dwc3_data->rstc_rst = devm_reset_control_get(dev, "softreset"); - if (IS_ERR(dwc3_data->rstc_rst)) { - dev_err(&pdev->dev, "could not get reset controller\n"); - ret = PTR_ERR(dwc3_data->rstc_rst); - goto undo_powerdown; - } - - /* Manage SoftReset */ - reset_control_deassert(dwc3_data->rstc_rst); - - child = of_get_child_by_name(node, "dwc3"); - if (!child) { - dev_err(&pdev->dev, "failed to find dwc3 core node\n"); - ret = -ENODEV; - goto undo_softreset; - } - - dwc3_data->dr_mode = of_usb_get_dr_mode(child); - - /* Allocate and initialize the core */ - ret = of_platform_populate(node, NULL, NULL, dev); - if (ret) { - dev_err(dev, "failed to add dwc3 core\n"); - goto undo_softreset; - } - - /* - * Configure the USB port as device or host according to the static - * configuration passed from DT. - * DRD is the only mode currently supported so this will be enhanced - * as soon as OTG is available. - */ - ret = st_dwc3_drd_init(dwc3_data); - if (ret) { - dev_err(dev, "drd initialisation failed\n"); - goto undo_softreset; - } - - /* ST glue logic init */ - st_dwc3_init(dwc3_data); - - platform_set_drvdata(pdev, dwc3_data); - return 0; - -undo_softreset: - reset_control_assert(dwc3_data->rstc_rst); -undo_powerdown: - reset_control_assert(dwc3_data->rstc_pwrdn); -undo_platform_dev_alloc: - platform_device_put(pdev); - return ret; -} - -static int st_dwc3_remove(struct platform_device *pdev) -{ - struct st_dwc3 *dwc3_data = platform_get_drvdata(pdev); - - of_platform_depopulate(&pdev->dev); - - reset_control_assert(dwc3_data->rstc_pwrdn); - reset_control_assert(dwc3_data->rstc_rst); - - return 0; -} - -#ifdef CONFIG_PM_SLEEP -static int st_dwc3_suspend(struct device *dev) -{ - struct st_dwc3 *dwc3_data = dev_get_drvdata(dev); - - reset_control_assert(dwc3_data->rstc_pwrdn); - reset_control_assert(dwc3_data->rstc_rst); - - pinctrl_pm_select_sleep_state(dev); - - return 0; -} - -static int st_dwc3_resume(struct device *dev) -{ - struct st_dwc3 *dwc3_data = dev_get_drvdata(dev); - int ret; - - pinctrl_pm_select_default_state(dev); - - reset_control_deassert(dwc3_data->rstc_pwrdn); - reset_control_deassert(dwc3_data->rstc_rst); - - ret = st_dwc3_drd_init(dwc3_data); - if (ret) { - dev_err(dev, "drd initialisation failed\n"); - return ret; - } - - /* ST glue logic init */ - st_dwc3_init(dwc3_data); - - return 0; -} -#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[] = { - { .compatible = "st,stih407-dwc3" }, - { /* sentinel */ }, -}; - -MODULE_DEVICE_TABLE(of, st_dwc3_match); - -static struct platform_driver st_dwc3_driver = { - .probe = st_dwc3_probe, - .remove = st_dwc3_remove, - .driver = { - .name = "usb-st-dwc3", - .of_match_table = st_dwc3_match, - .pm = &st_dwc3_dev_pm_ops, - }, -}; - -module_platform_driver(st_dwc3_driver); - -MODULE_AUTHOR("Giuseppe Cavallaro <peppe.cavallaro@st.com>"); -MODULE_DESCRIPTION("DesignWare USB3 STi Glue Layer"); -MODULE_LICENSE("GPL v2"); |