Initial import

1 files changed, 360 insertions, 0 deletions

diff --git a/drivers/phy/phy-omap-control.c b/drivers/phy/phy-omap-control.c
new file mode 100644
index 000000000..e9c41b3fa
--- /dev/null
+++ b/drivers/phy/phy-omap-control.c
@@ -0,0 +1,360 @@
+/*
+ * omap-control-phy.c - The PHY 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/of_device.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/clk.h>
+#include <linux/phy/omap_control_phy.h>
+
+/**
+ * omap_control_pcie_pcs - set the PCS delay count
+ * @dev: the control module device
+ * @delay: 8 bit delay value
+ */
+void omap_control_pcie_pcs(struct device *dev, u8 delay)
+{
+	u32 val;
+	struct omap_control_phy	*control_phy;
+
+	if (IS_ERR(dev) || !dev) {
+		pr_err("%s: invalid device\n", __func__);
+		return;
+	}
+
+	control_phy = dev_get_drvdata(dev);
+	if (!control_phy) {
+		dev_err(dev, "%s: invalid control phy device\n", __func__);
+		return;
+	}
+
+	if (control_phy->type != OMAP_CTRL_TYPE_PCIE) {
+		dev_err(dev, "%s: unsupported operation\n", __func__);
+		return;
+	}
+
+	val = readl(control_phy->pcie_pcs);
+	val &= ~(OMAP_CTRL_PCIE_PCS_MASK <<
+		OMAP_CTRL_PCIE_PCS_DELAY_COUNT_SHIFT);
+	val |= (delay << OMAP_CTRL_PCIE_PCS_DELAY_COUNT_SHIFT);
+	writel(val, control_phy->pcie_pcs);
+}
+EXPORT_SYMBOL_GPL(omap_control_pcie_pcs);
+
+/**
+ * omap_control_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_phy_power(struct device *dev, int on)
+{
+	u32 val;
+	unsigned long rate;
+	struct omap_control_phy	*control_phy;
+
+	if (IS_ERR(dev) || !dev) {
+		pr_err("%s: invalid device\n", __func__);
+		return;
+	}
+
+	control_phy = dev_get_drvdata(dev);
+	if (!control_phy) {
+		dev_err(dev, "%s: invalid control phy device\n", __func__);
+		return;
+	}
+
+	if (control_phy->type == OMAP_CTRL_TYPE_OTGHS)
+		return;
+
+	val = readl(control_phy->power);
+
+	switch (control_phy->type) {
+	case OMAP_CTRL_TYPE_USB2:
+		if (on)
+			val &= ~OMAP_CTRL_DEV_PHY_PD;
+		else
+			val |= OMAP_CTRL_DEV_PHY_PD;
+		break;
+
+	case OMAP_CTRL_TYPE_PCIE:
+	case OMAP_CTRL_TYPE_PIPE3:
+		rate = clk_get_rate(control_phy->sys_clk);
+		rate = rate/1000000;
+
+		if (on) {
+			val &= ~(OMAP_CTRL_PIPE3_PHY_PWRCTL_CLK_CMD_MASK |
+				OMAP_CTRL_PIPE3_PHY_PWRCTL_CLK_FREQ_MASK);
+			val |= OMAP_CTRL_PIPE3_PHY_TX_RX_POWERON <<
+				OMAP_CTRL_PIPE3_PHY_PWRCTL_CLK_CMD_SHIFT;
+			val |= rate <<
+				OMAP_CTRL_PIPE3_PHY_PWRCTL_CLK_FREQ_SHIFT;
+		} else {
+			val &= ~OMAP_CTRL_PIPE3_PHY_PWRCTL_CLK_CMD_MASK;
+			val |= OMAP_CTRL_PIPE3_PHY_TX_RX_POWEROFF <<
+				OMAP_CTRL_PIPE3_PHY_PWRCTL_CLK_CMD_SHIFT;
+		}
+		break;
+
+	case OMAP_CTRL_TYPE_DRA7USB2:
+		if (on)
+			val &= ~OMAP_CTRL_USB2_PHY_PD;
+		else
+			val |= OMAP_CTRL_USB2_PHY_PD;
+		break;
+
+	case OMAP_CTRL_TYPE_AM437USB2:
+		if (on) {
+			val &= ~(AM437X_CTRL_USB2_PHY_PD |
+					AM437X_CTRL_USB2_OTG_PD);
+			val |= (AM437X_CTRL_USB2_OTGVDET_EN |
+					AM437X_CTRL_USB2_OTGSESSEND_EN);
+		} else {
+			val &= ~(AM437X_CTRL_USB2_OTGVDET_EN |
+					AM437X_CTRL_USB2_OTGSESSEND_EN);
+			val |= (AM437X_CTRL_USB2_PHY_PD |
+					 AM437X_CTRL_USB2_OTG_PD);
+		}
+		break;
+	default:
+		dev_err(dev, "%s: type %d not recognized\n",
+			__func__, control_phy->type);
+		break;
+	}
+
+	writel(val, control_phy->power);
+}
+EXPORT_SYMBOL_GPL(omap_control_phy_power);
+
+/**
+ * omap_control_usb_host_mode - set AVALID, VBUSVALID and ID pin in grounded
+ * @ctrl_phy: struct omap_control_phy *
+ *
+ * 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_phy *ctrl_phy)
+{
+	u32 val;
+
+	val = readl(ctrl_phy->otghs_control);
+	val &= ~(OMAP_CTRL_DEV_IDDIG | OMAP_CTRL_DEV_SESSEND);
+	val |= OMAP_CTRL_DEV_AVALID | OMAP_CTRL_DEV_VBUSVALID;
+	writel(val, ctrl_phy->otghs_control);
+}
+
+/**
+ * omap_control_usb_device_mode - set AVALID, VBUSVALID and ID pin in high
+ * impedance
+ * @ctrl_phy: struct omap_control_phy *
+ *
+ * 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_phy *ctrl_phy)
+{
+	u32 val;
+
+	val = readl(ctrl_phy->otghs_control);
+	val &= ~OMAP_CTRL_DEV_SESSEND;
+	val |= OMAP_CTRL_DEV_IDDIG | OMAP_CTRL_DEV_AVALID |
+		OMAP_CTRL_DEV_VBUSVALID;
+	writel(val, ctrl_phy->otghs_control);
+}
+
+/**
+ * omap_control_usb_set_sessionend - Enable SESSIONEND and IDIG to high
+ * impedance
+ * @ctrl_phy: struct omap_control_phy *
+ *
+ * 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_phy *ctrl_phy)
+{
+	u32 val;
+
+	val = readl(ctrl_phy->otghs_control);
+	val &= ~(OMAP_CTRL_DEV_AVALID | OMAP_CTRL_DEV_VBUSVALID);
+	val |= OMAP_CTRL_DEV_IDDIG | OMAP_CTRL_DEV_SESSEND;
+	writel(val, ctrl_phy->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_phy	*ctrl_phy;
+
+	if (IS_ERR(dev) || !dev)
+		return;
+
+	ctrl_phy = dev_get_drvdata(dev);
+	if (!ctrl_phy) {
+		dev_err(dev, "Invalid control phy device\n");
+		return;
+	}
+
+	if (ctrl_phy->type != OMAP_CTRL_TYPE_OTGHS)
+		return;
+
+	switch (mode) {
+	case USB_MODE_HOST:
+		omap_control_usb_host_mode(ctrl_phy);
+		break;
+	case USB_MODE_DEVICE:
+		omap_control_usb_device_mode(ctrl_phy);
+		break;
+	case USB_MODE_DISCONNECT:
+		omap_control_usb_set_sessionend(ctrl_phy);
+		break;
+	default:
+		dev_vdbg(dev, "invalid omap control usb mode\n");
+	}
+}
+EXPORT_SYMBOL_GPL(omap_control_usb_set_mode);
+
+static const enum omap_control_phy_type otghs_data = OMAP_CTRL_TYPE_OTGHS;
+static const enum omap_control_phy_type usb2_data = OMAP_CTRL_TYPE_USB2;
+static const enum omap_control_phy_type pipe3_data = OMAP_CTRL_TYPE_PIPE3;
+static const enum omap_control_phy_type pcie_data = OMAP_CTRL_TYPE_PCIE;
+static const enum omap_control_phy_type dra7usb2_data = OMAP_CTRL_TYPE_DRA7USB2;
+static const enum omap_control_phy_type am437usb2_data = OMAP_CTRL_TYPE_AM437USB2;
+
+static const struct of_device_id omap_control_phy_id_table[] = {
+	{
+		.compatible = "ti,control-phy-otghs",
+		.data = &otghs_data,
+	},
+	{
+		.compatible = "ti,control-phy-usb2",
+		.data = &usb2_data,
+	},
+	{
+		.compatible = "ti,control-phy-pipe3",
+		.data = &pipe3_data,
+	},
+	{
+		.compatible = "ti,control-phy-pcie",
+		.data = &pcie_data,
+	},
+	{
+		.compatible = "ti,control-phy-usb2-dra7",
+		.data = &dra7usb2_data,
+	},
+	{
+		.compatible = "ti,control-phy-usb2-am437",
+		.data = &am437usb2_data,
+	},
+	{},
+};
+MODULE_DEVICE_TABLE(of, omap_control_phy_id_table);
+
+static int omap_control_phy_probe(struct platform_device *pdev)
+{
+	struct resource	*res;
+	const struct of_device_id *of_id;
+	struct omap_control_phy *control_phy;
+
+	of_id = of_match_device(omap_control_phy_id_table, &pdev->dev);
+	if (!of_id)
+		return -EINVAL;
+
+	control_phy = devm_kzalloc(&pdev->dev, sizeof(*control_phy),
+		GFP_KERNEL);
+	if (!control_phy)
+		return -ENOMEM;
+
+	control_phy->dev = &pdev->dev;
+	control_phy->type = *(enum omap_control_phy_type *)of_id->data;
+
+	if (control_phy->type == OMAP_CTRL_TYPE_OTGHS) {
+		res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
+			"otghs_control");
+		control_phy->otghs_control = devm_ioremap_resource(
+			&pdev->dev, res);
+		if (IS_ERR(control_phy->otghs_control))
+			return PTR_ERR(control_phy->otghs_control);
+	} else {
+		res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
+				"power");
+		control_phy->power = devm_ioremap_resource(&pdev->dev, res);
+		if (IS_ERR(control_phy->power)) {
+			dev_err(&pdev->dev, "Couldn't get power register\n");
+			return PTR_ERR(control_phy->power);
+		}
+	}
+
+	if (control_phy->type == OMAP_CTRL_TYPE_PIPE3 ||
+	    control_phy->type == OMAP_CTRL_TYPE_PCIE) {
+		control_phy->sys_clk = devm_clk_get(control_phy->dev,
+			"sys_clkin");
+		if (IS_ERR(control_phy->sys_clk)) {
+			pr_err("%s: unable to get sys_clkin\n", __func__);
+			return -EINVAL;
+		}
+	}
+
+	if (control_phy->type == OMAP_CTRL_TYPE_PCIE) {
+		res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
+						   "pcie_pcs");
+		control_phy->pcie_pcs = devm_ioremap_resource(&pdev->dev, res);
+		if (IS_ERR(control_phy->pcie_pcs))
+			return PTR_ERR(control_phy->pcie_pcs);
+	}
+
+	dev_set_drvdata(control_phy->dev, control_phy);
+
+	return 0;
+}
+
+static struct platform_driver omap_control_phy_driver = {
+	.probe		= omap_control_phy_probe,
+	.driver		= {
+		.name	= "omap-control-phy",
+		.of_match_table = omap_control_phy_id_table,
+	},
+};
+
+static int __init omap_control_phy_init(void)
+{
+	return platform_driver_register(&omap_control_phy_driver);
+}
+subsys_initcall(omap_control_phy_init);
+
+static void __exit omap_control_phy_exit(void)
+{
+	platform_driver_unregister(&omap_control_phy_driver);
+}
+module_exit(omap_control_phy_exit);
+
+MODULE_ALIAS("platform:omap_control_phy");
+MODULE_AUTHOR("Texas Instruments Inc.");
+MODULE_DESCRIPTION("OMAP Control Module PHY Driver");
+MODULE_LICENSE("GPL v2");