--- /dev/null
+/*
+ * omap-control-usb.c - The USB part of control module.
+ *
+ * Copyright (C) 2013 Texas Instruments Incorporated - http://www.ti.com
+ * 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.
+ *
+ * Author: Kishon Vijay Abraham I <kishon@ti.com>
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/of.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/clk.h>
+#include <linux/usb/omap_control_usb.h>
+
+static struct omap_control_usb *control_usb;
+
+/**
+ * omap_get_control_dev - returns the device pointer for this control device
+ *
+ * This API should be called to get the device pointer for this control
+ * module device. This device pointer should be used for called other
+ * exported API's in this driver.
+ *
+ * To be used by PHY driver and glue driver.
+ */
+struct device *omap_get_control_dev(void)
+{
+ if (!control_usb)
+ return ERR_PTR(-ENODEV);
+
+ return control_usb->dev;
+}
+EXPORT_SYMBOL_GPL(omap_get_control_dev);
+
+/**
+ * omap_control_usb3_phy_power - power on/off the serializer using control
+ * module
+ * @dev: the control module device
+ * @on: 0 to off and 1 to on based on powering on or off the PHY
+ *
+ * usb3 PHY driver should call this API to power on or off the PHY.
+ */
+void omap_control_usb3_phy_power(struct device *dev, bool on)
+{
+ u32 val;
+ unsigned long rate;
+ struct omap_control_usb *control_usb = dev_get_drvdata(dev);
+
+ if (control_usb->type != OMAP_CTRL_DEV_TYPE2)
+ return;
+
+ rate = clk_get_rate(control_usb->sys_clk);
+ rate = rate/1000000;
+
+ val = readl(control_usb->phy_power);
+
+ if (on) {
+ val &= ~(OMAP_CTRL_USB_PWRCTL_CLK_CMD_MASK |
+ OMAP_CTRL_USB_PWRCTL_CLK_FREQ_MASK);
+ val |= OMAP_CTRL_USB3_PHY_TX_RX_POWERON <<
+ OMAP_CTRL_USB_PWRCTL_CLK_CMD_SHIFT;
+ val |= rate << OMAP_CTRL_USB_PWRCTL_CLK_FREQ_SHIFT;
+ } else {
+ val &= ~OMAP_CTRL_USB_PWRCTL_CLK_CMD_MASK;
+ val |= OMAP_CTRL_USB3_PHY_TX_RX_POWEROFF <<
+ OMAP_CTRL_USB_PWRCTL_CLK_CMD_SHIFT;
+ }
+
+ writel(val, control_usb->phy_power);
+}
+EXPORT_SYMBOL_GPL(omap_control_usb3_phy_power);
+
+/**
+ * omap_control_usb_phy_power - power on/off the phy using control module reg
+ * @dev: the control module device
+ * @on: 0 or 1, based on powering on or off the PHY
+ */
+void omap_control_usb_phy_power(struct device *dev, int on)
+{
+ u32 val;
+ struct omap_control_usb *control_usb = dev_get_drvdata(dev);
+
+ val = readl(control_usb->dev_conf);
+
+ if (on)
+ val &= ~OMAP_CTRL_DEV_PHY_PD;
+ else
+ val |= OMAP_CTRL_DEV_PHY_PD;
+
+ writel(val, control_usb->dev_conf);
+}
+EXPORT_SYMBOL_GPL(omap_control_usb_phy_power);
+
+/**
+ * omap_control_usb_host_mode - set AVALID, VBUSVALID and ID pin in grounded
+ * @ctrl_usb: struct omap_control_usb *
+ *
+ * Writes to the mailbox register to notify the usb core that a usb
+ * device has been connected.
+ */
+static void omap_control_usb_host_mode(struct omap_control_usb *ctrl_usb)
+{
+ u32 val;
+
+ val = readl(ctrl_usb->otghs_control);
+ val &= ~(OMAP_CTRL_DEV_IDDIG | OMAP_CTRL_DEV_SESSEND);
+ val |= OMAP_CTRL_DEV_AVALID | OMAP_CTRL_DEV_VBUSVALID;
+ writel(val, ctrl_usb->otghs_control);
+}
+
+/**
+ * omap_control_usb_device_mode - set AVALID, VBUSVALID and ID pin in high
+ * impedance
+ * @ctrl_usb: struct omap_control_usb *
+ *
+ * Writes to the mailbox register to notify the usb core that it has been
+ * connected to a usb host.
+ */
+static void omap_control_usb_device_mode(struct omap_control_usb *ctrl_usb)
+{
+ u32 val;
+
+ val = readl(ctrl_usb->otghs_control);
+ val &= ~OMAP_CTRL_DEV_SESSEND;
+ val |= OMAP_CTRL_DEV_IDDIG | OMAP_CTRL_DEV_AVALID |
+ OMAP_CTRL_DEV_VBUSVALID;
+ writel(val, ctrl_usb->otghs_control);
+}
+
+/**
+ * omap_control_usb_set_sessionend - Enable SESSIONEND and IDIG to high
+ * impedance
+ * @ctrl_usb: struct omap_control_usb *
+ *
+ * Writes to the mailbox register to notify the usb core it's now in
+ * disconnected state.
+ */
+static void omap_control_usb_set_sessionend(struct omap_control_usb *ctrl_usb)
+{
+ u32 val;
+
+ val = readl(ctrl_usb->otghs_control);
+ val &= ~(OMAP_CTRL_DEV_AVALID | OMAP_CTRL_DEV_VBUSVALID);
+ val |= OMAP_CTRL_DEV_IDDIG | OMAP_CTRL_DEV_SESSEND;
+ writel(val, ctrl_usb->otghs_control);
+}
+
+/**
+ * omap_control_usb_set_mode - Calls to functions to set USB in one of host mode
+ * or device mode or to denote disconnected state
+ * @dev: the control module device
+ * @mode: The mode to which usb should be configured
+ *
+ * This is an API to write to the mailbox register to notify the usb core that
+ * a usb device has been connected.
+ */
+void omap_control_usb_set_mode(struct device *dev,
+ enum omap_control_usb_mode mode)
+{
+ struct omap_control_usb *ctrl_usb;
+
+ if (IS_ERR(dev) || control_usb->type != OMAP_CTRL_DEV_TYPE1)
+ return;
+
+ ctrl_usb = dev_get_drvdata(dev);
+
+ switch (mode) {
+ case USB_MODE_HOST:
+ omap_control_usb_host_mode(ctrl_usb);
+ break;
+ case USB_MODE_DEVICE:
+ omap_control_usb_device_mode(ctrl_usb);
+ break;
+ case USB_MODE_DISCONNECT:
+ omap_control_usb_set_sessionend(ctrl_usb);
+ break;
+ default:
+ dev_vdbg(dev, "invalid omap control usb mode\n");
+ }
+}
+EXPORT_SYMBOL_GPL(omap_control_usb_set_mode);
+
+static int omap_control_usb_probe(struct platform_device *pdev)
+{
+ struct resource *res;
+ struct device_node *np = pdev->dev.of_node;
+ struct omap_control_usb_platform_data *pdata = pdev->dev.platform_data;
+
+ control_usb = devm_kzalloc(&pdev->dev, sizeof(*control_usb),
+ GFP_KERNEL);
+ if (!control_usb) {
+ dev_err(&pdev->dev, "unable to alloc memory for control usb\n");
+ return -ENOMEM;
+ }
+
+ if (np) {
+ of_property_read_u32(np, "ti,type", &control_usb->type);
+ } else if (pdata) {
+ control_usb->type = pdata->type;
+ } else {
+ dev_err(&pdev->dev, "no pdata present\n");
+ return -EINVAL;
+ }
+
+ control_usb->dev = &pdev->dev;
+
+ res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
+ "control_dev_conf");
+ control_usb->dev_conf = devm_request_and_ioremap(&pdev->dev, res);
+ if (!control_usb->dev_conf) {
+ dev_err(&pdev->dev, "Failed to obtain io memory\n");
+ return -EADDRNOTAVAIL;
+ }
+
+ if (control_usb->type == OMAP_CTRL_DEV_TYPE1) {
+ res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
+ "otghs_control");
+ control_usb->otghs_control = devm_request_and_ioremap(
+ &pdev->dev, res);
+ if (!control_usb->otghs_control) {
+ dev_err(&pdev->dev, "Failed to obtain io memory\n");
+ return -EADDRNOTAVAIL;
+ }
+ }
+
+ if (control_usb->type == OMAP_CTRL_DEV_TYPE2) {
+ res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
+ "phy_power_usb");
+ control_usb->phy_power = devm_request_and_ioremap(
+ &pdev->dev, res);
+ if (!control_usb->phy_power) {
+ dev_dbg(&pdev->dev, "Failed to obtain io memory\n");
+ return -EADDRNOTAVAIL;
+ }
+
+ control_usb->sys_clk = devm_clk_get(control_usb->dev,
+ "sys_clkin");
+ if (IS_ERR(control_usb->sys_clk)) {
+ pr_err("%s: unable to get sys_clkin\n", __func__);
+ return -EINVAL;
+ }
+ }
+
+
+ dev_set_drvdata(control_usb->dev, control_usb);
+
+ return 0;
+}
+
+#ifdef CONFIG_OF
+static const struct of_device_id omap_control_usb_id_table[] = {
+ { .compatible = "ti,omap-control-usb" },
+ {}
+};
+MODULE_DEVICE_TABLE(of, omap_control_usb_id_table);
+#endif
+
+static struct platform_driver omap_control_usb_driver = {
+ .probe = omap_control_usb_probe,
+ .driver = {
+ .name = "omap-control-usb",
+ .owner = THIS_MODULE,
+ .of_match_table = of_match_ptr(omap_control_usb_id_table),
+ },
+};
+
+static int __init omap_control_usb_init(void)
+{
+ return platform_driver_register(&omap_control_usb_driver);
+}
+subsys_initcall(omap_control_usb_init);
+
+static void __exit omap_control_usb_exit(void)
+{
+ platform_driver_unregister(&omap_control_usb_driver);
+}
+module_exit(omap_control_usb_exit);
+
+MODULE_ALIAS("platform: omap_control_usb");
+MODULE_AUTHOR("Texas Instruments Inc.");
+MODULE_DESCRIPTION("OMAP Control Module USB Driver");
+MODULE_LICENSE("GPL v2");
--- /dev/null
+/*
+ * omap_control_usb.h - Header file for the USB part of control module.
+ *
+ * Copyright (C) 2013 Texas Instruments Incorporated - http://www.ti.com
+ * 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.
+ *
+ * Author: Kishon Vijay Abraham I <kishon@ti.com>
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#ifndef __OMAP_CONTROL_USB_H__
+#define __OMAP_CONTROL_USB_H__
+
+struct omap_control_usb {
+ struct device *dev;
+
+ u32 __iomem *dev_conf;
+ u32 __iomem *otghs_control;
+ u32 __iomem *phy_power;
+
+ struct clk *sys_clk;
+
+ u32 type;
+};
+
+struct omap_control_usb_platform_data {
+ u8 type;
+};
+
+enum omap_control_usb_mode {
+ USB_MODE_UNDEFINED = 0,
+ USB_MODE_HOST,
+ USB_MODE_DEVICE,
+ USB_MODE_DISCONNECT,
+};
+
+/* To differentiate ctrl module IP having either mailbox or USB3 PHY power */
+#define OMAP_CTRL_DEV_TYPE1 0x1
+#define OMAP_CTRL_DEV_TYPE2 0x2
+
+#define OMAP_CTRL_DEV_PHY_PD BIT(0)
+
+#define OMAP_CTRL_DEV_AVALID BIT(0)
+#define OMAP_CTRL_DEV_BVALID BIT(1)
+#define OMAP_CTRL_DEV_VBUSVALID BIT(2)
+#define OMAP_CTRL_DEV_SESSEND BIT(3)
+#define OMAP_CTRL_DEV_IDDIG BIT(4)
+
+#define OMAP_CTRL_USB_PWRCTL_CLK_CMD_MASK 0x003FC000
+#define OMAP_CTRL_USB_PWRCTL_CLK_CMD_SHIFT 0xE
+
+#define OMAP_CTRL_USB_PWRCTL_CLK_FREQ_MASK 0xFFC00000
+#define OMAP_CTRL_USB_PWRCTL_CLK_FREQ_SHIFT 0x16
+
+#define OMAP_CTRL_USB3_PHY_TX_RX_POWERON 0x3
+#define OMAP_CTRL_USB3_PHY_TX_RX_POWEROFF 0x0
+
+#if IS_ENABLED(CONFIG_OMAP_CONTROL_USB)
+extern struct device *omap_get_control_dev(void);
+extern void omap_control_usb_phy_power(struct device *dev, int on);
+extern void omap_control_usb3_phy_power(struct device *dev, bool on);
+extern void omap_control_usb_set_mode(struct device *dev,
+ enum omap_control_usb_mode mode);
+#else
+static inline struct device *omap_get_control_dev()
+{
+ return ERR_PTR(-ENODEV);
+}
+
+static inline void omap_control_usb_phy_power(struct device *dev, int on)
+{
+}
+
+static inline void omap_control_usb3_phy_power(struct device *dev, int on)
+{
+}
+
+static inline void omap_control_usb_set_mode(struct device *dev,
+ enum omap_control_usb_mode mode)
+{
+}
+#endif
+
+#endif /* __OMAP_CONTROL_USB_H__ */
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