@@ -77,6 +77,15 @@ config USB_DWC3_KEYSTONE
default USB_DWC3
help
Support of USB2/3 functionality in TI Keystone2 platforms.
+
+config USB_DWC3_ST
+ tristate "STMicroelectronics Platforms"
+ depends on ARCH_STI && OF
+ default USB_DWC3_HOST
+ help
+ STMicroelectronics SoCs chip with one DesignWare Core USB3 IP
+ inside (i.e. STiH407).
+
Say 'Y' or 'M' here if you have one such device
comment "Debugging features"
@@ -33,3 +33,4 @@ obj-$(CONFIG_USB_DWC3_OMAP) += dwc3-omap.o
obj-$(CONFIG_USB_DWC3_EXYNOS) += dwc3-exynos.o
obj-$(CONFIG_USB_DWC3_PCI) += dwc3-pci.o
obj-$(CONFIG_USB_DWC3_KEYSTONE) += dwc3-keystone.o
+obj-$(CONFIG_USB_DWC3_ST) += dwc3-st.o
new file mode 100644
@@ -0,0 +1,325 @@
+/**
+ * dwc3-st.c Support for dwc3 platform devices on ST Microelectronics platforms
+ *
+ * This is a small platform 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/module.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/ioport.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
+#include <linux/mfd/syscon.h>
+#include <linux/delay.h>
+#include <linux/regmap.h>
+#include <linux/reset.h>
+
+#include "core.h"
+#include "io.h"
+
+/* Reg glue registers */
+#define USB2_CLKRST_CTRL 0x00
+#define aux_clk_en(n) ((n)<<0)
+#define sw_pipew_reset_n(n) ((n)<<4)
+#define ext_cfg_reset_n(n) ((n)<<8)
+#define xhci_revision(n) ((n)<<12)
+
+#define USB2_VBUS_MNGMNT_SEL1 0x2C
+/*
+ * 2'b00 : Override value from Reg 0x30 is selected
+ * 2'b01 : utmiotg_vbusvalid from usb3_top top is selected
+ * 2'b10 : pipew_powerpresent from PIPEW instance is selected
+ * 2'b11 : value is 1'b0
+ */
+#define SEL_OVERRIDE_VBUSVALID(n) ((n)<<0)
+#define SEL_OVERRIDE_POWERPRESENT(n) ((n)<<4)
+#define SEL_OVERRIDE_BVALID(n) ((n)<<8)
+
+#define USB2_VBUS_MNGMNT_VAL1 0x30
+#define OVERRIDE_VBUSVALID_VAL (1 << 0)
+#define OVERRIDE_POWERPRESENT_VAL (1 << 4)
+#define OVERRIDE_BVALID_VAL (1 << 8)
+
+/* Static DRD configuration */
+#define USB_HOST_DEFAULT_MASK 0xffe
+#define USB_SET_PORT_DEVICE 0x1
+
+struct st_dwc3 {
+ struct platform_device *dwc3; /* platform device pointer */
+ struct device *dev; /* device pointer */
+ void __iomem *glue_base; /* ioaddr for programming the glue */
+ struct regmap *regmap; /* regmap for getting syscfg */
+ int syscfg_reg_off; /* usb syscfg control offset */
+ bool drd_device_conf; /* DRD static host/device conf */
+ struct reset_control *rstc_pwrdn;/* Rst control for powerdown*/
+};
+
+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;
+
+ regmap_read(dwc3_data->regmap, dwc3_data->syscfg_reg_off, &val);
+
+ if (dwc3_data->drd_device_conf)
+ val |= USB_SET_PORT_DEVICE;
+ else
+ val &= USB_HOST_DEFAULT_MASK;
+
+ 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, USB2_CLKRST_CTRL);
+
+ reg |= aux_clk_en(1) | ext_cfg_reset_n(1) | xhci_revision(1);
+ reg &= ~sw_pipew_reset_n(1);
+ st_dwc3_writel(dwc3_data->glue_base, USB2_CLKRST_CTRL, reg);
+
+ reg = st_dwc3_readl(dwc3_data->glue_base, USB2_VBUS_MNGMNT_SEL1);
+ reg |= SEL_OVERRIDE_VBUSVALID(1) | SEL_OVERRIDE_POWERPRESENT(1) |
+ SEL_OVERRIDE_BVALID(1);
+ st_dwc3_writel(dwc3_data->glue_base, USB2_VBUS_MNGMNT_SEL1, reg);
+ udelay(100);
+
+ reg = st_dwc3_readl(dwc3_data->glue_base, USB2_CLKRST_CTRL);
+ reg |= sw_pipew_reset_n(1);
+ st_dwc3_writel(dwc3_data->glue_base, USB2_CLKRST_CTRL, reg);
+}
+
+static void st_dwc3_dt_get_pdata(struct platform_device *pdev,
+ struct st_dwc3 *dwc3_data)
+{
+ struct device_node *np = pdev->dev.of_node;
+
+ dwc3_data->drd_device_conf =
+ of_property_read_bool(np, "st,dwc3-drd-device");
+}
+
+/**
+ * st_dwc3_probe: main probe function
+ * @pdev: platform_device
+ * Description: this is the probe function that gets all the resources to manage
+ * the glue-logic, setup the controller and take out of powerdown.
+ */
+static int st_dwc3_probe(struct platform_device *pdev)
+{
+ struct platform_device *dwc3;
+ struct st_dwc3 *dwc3_data;
+ struct resource *res;
+ struct device *dev = &pdev->dev;
+ struct device_node *node = dev->of_node;
+ struct regmap *regmap;
+ int ret = 0;
+
+ if (!node) {
+ dev_err(dev, "device node not found\n");
+ return -EINVAL;
+ }
+
+ 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");
+ if (!res)
+ return -ENXIO;
+
+ dwc3_data->glue_base = devm_request_and_ioremap(dev, res);
+ if (!dwc3_data->glue_base)
+ return -EADDRNOTAVAIL;
+
+ regmap = syscon_regmap_lookup_by_phandle(node, "st,syscfg");
+ if (IS_ERR(regmap))
+ return PTR_ERR(regmap);
+
+ dwc3 = platform_device_alloc("st-dwc3", PLATFORM_DEVID_AUTO);
+ if (!dwc3) {
+ dev_err(&pdev->dev, "couldn't allocate dwc3 device\n");
+ return -ENOMEM;
+ }
+
+ dma_set_coherent_mask(&dwc3->dev, dev->coherent_dma_mask);
+
+ dwc3->dev.parent = &pdev->dev;
+ dwc3->dev.dma_mask = pdev->dev.dma_mask;
+ dwc3->dev.dma_parms = pdev->dev.dma_parms;
+
+ dwc3_data->dwc3 = dwc3;
+ dwc3_data->dev = &pdev->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_info(&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(dwc3_data->dev, NULL);
+ if (IS_ERR(dwc3_data->rstc_pwrdn)) {
+ dev_err(&pdev->dev, "could not get reset controller\n");
+ ret = PTR_ERR(dwc3_data->rstc_pwrdn);
+ goto undo_platform_dev_alloc;
+ }
+
+ /* Manage PowerDown */
+ reset_control_deassert(dwc3_data->rstc_pwrdn);
+
+ st_dwc3_dt_get_pdata(pdev, dwc3_data);
+
+ /* 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_powerdown;
+ }
+
+ /*
+ * Configure the USB port as device or host according to the static
+ * configuration passed from the platform.
+ * DRD is the only mode currently supported so this will be enhanced
+ * later as soon as OTG will be available.
+ */
+ ret = st_dwc3_drd_init(dwc3_data);
+ if (ret) {
+ dev_err(dev, "st_dwc3_drd_init failed\n");
+ goto undo_powerdown;
+ }
+
+ dev_info(&pdev->dev, "configured as %s DRD\n",
+ dwc3_data->drd_device_conf ? "device" : "host");
+
+ /* ST glue logic init */
+ st_dwc3_init(dwc3_data);
+
+ ret = platform_device_add_resources(dwc3_data->dwc3, pdev->resource,
+ pdev->num_resources);
+ if (ret) {
+ dev_err(&pdev->dev, "couldn't add resources to dwc3 device\n");
+ goto undo_powerdown;
+ }
+
+ ret = platform_device_add(dwc3_data->dwc3);
+ if (ret) {
+ dev_err(&pdev->dev, "failed to register dwc3 device\n");
+ goto undo_powerdown;
+ }
+
+ platform_set_drvdata(pdev, dwc3_data);
+
+ return 0;
+
+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);
+
+ platform_device_unregister(dwc3_data->dwc3);
+
+ 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);
+
+ 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);
+
+ pinctrl_pm_select_default_state(dev);
+
+ reset_control_deassert(dwc3_data->rstc_pwrdn);
+
+ return 0;
+}
+
+#endif /* CONFIG_PM_SLEEP */
+
+static const struct dev_pm_ops st_dwc3_dev_pm_ops = {
+ SET_SYSTEM_SLEEP_PM_OPS(st_dwc3_suspend, st_dwc3_resume)
+};
+
+static 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",
+ .owner = THIS_MODULE,
+ .of_match_table = of_match_ptr(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");