[PATCH v2 2/7] usb: phy: dsps: adding usbphy driver for am33xx platform

[Ravi Babu]

Adds usb-phy driver support for am33xx platform, the host/device
peripheral controller shall get this phy object to control the phy
operations.

Signed-off-by: Ravi Babu <ravibabu@xxxxxx>
---
 drivers/usb/phy/Kconfig        |    9 ++
 drivers/usb/phy/Makefile       |    1 +
 drivers/usb/phy/phy-dsps-usb.c |  236 ++++++++++++++++++++++++++++++++++++++++
 3 files changed, 246 insertions(+), 0 deletions(-)
 create mode 100644 drivers/usb/phy/phy-dsps-usb.c

diff --git a/drivers/usb/phy/Kconfig b/drivers/usb/phy/Kconfig
index 372db48..b55c265 100644
--- a/drivers/usb/phy/Kconfig
+++ b/drivers/usb/phy/Kconfig
@@ -85,6 +85,15 @@ config OMAP_USB3
 	  This driver interacts with the "OMAP Control USB Driver" to power
 	  on/off the PHY.
 
+config DSPS_USB2PHY
+	tristate "DSPS USB2 PHY Driver"
+	depends on SOC_AM33XX
+	help
+	  Enable this to support the transceiver that is part of SOC. This
+	  phy supports all LS/FS/HS speed and also supports OTG functionality.
+	  The USB OTG controller communicates with this phy through stand UTMI
+	  interface.
+
 config SAMSUNG_USBPHY
 	tristate "Samsung USB PHY Driver"
 	help
diff --git a/drivers/usb/phy/Makefile b/drivers/usb/phy/Makefile
index 33863c0..0b16fb3 100644
--- a/drivers/usb/phy/Makefile
+++ b/drivers/usb/phy/Makefile
@@ -17,6 +17,7 @@ obj-$(CONFIG_NOP_USB_XCEIV)		+= phy-nop.o
 obj-$(CONFIG_OMAP_CONTROL_USB)		+= phy-omap-control.o
 obj-$(CONFIG_OMAP_USB2)			+= phy-omap-usb2.o
 obj-$(CONFIG_OMAP_USB3)			+= phy-omap-usb3.o
+obj-$(CONFIG_DSPS_USB2PHY)		+= phy-dsps-usb.o
 obj-$(CONFIG_SAMSUNG_USBPHY)		+= phy-samsung-usb.o
 obj-$(CONFIG_SAMSUNG_USB2PHY)		+= phy-samsung-usb2.o
 obj-$(CONFIG_SAMSUNG_USB3PHY)		+= phy-samsung-usb3.o
diff --git a/drivers/usb/phy/phy-dsps-usb.c b/drivers/usb/phy/phy-dsps-usb.c
new file mode 100644
index 0000000..aae97b3
--- /dev/null
+++ b/drivers/usb/phy/phy-dsps-usb.c
@@ -0,0 +1,236 @@
+/*
+ * phy-dsps-usb.c - TI gs70 based usb phy driver used by usb controller
+ *
+ * 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.
+ *
+ * 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/io.h>
+#include <linux/usb/omap_usb.h>
+#include <linux/usb/phy_companion.h>
+#include <linux/clk.h>
+#include <linux/err.h>
+#include <linux/pm_runtime.h>
+#include <linux/delay.h>
+#include <linux/usb/phy.h>
+
+struct dsps_phy {
+	struct usb_phy phy;
+	struct device *dev;
+	struct platform_device *pdev;
+	void __iomem *phy_ctrl;
+	void __iomem *phy_wkup;
+	u8	is_suspended:1;
+	int	id;
+};
+
+#define DSPS_USBPHY_CM_PWRDN		(1 << 0)
+#define DSPS_USBPHY_OTG_PWRDN		(1 << 1)
+#define DSPS_USBPHY_OTGVDET_EN		(1 << 19)
+#define DSPS_USBPHY_OTGSESSEND_EN	(1 << 20)
+#define DSPS_USB0_WKUP_CTRL_ENABLE	(1 << 0)
+#define DSPS_USB1_WKUP_CTRL_ENABLE	(1 << 8)
+#define phy_to_dspsphy(x)	container_of((x), struct dsps_phy, phy)
+
+static void dsps_usbphy_power(struct usb_phy *phy, bool is_on)
+{
+	struct dsps_phy *dsps_phy = phy_to_dspsphy(phy);
+	u32 val;
+
+	val = readl(dsps_phy->phy_ctrl);
+
+	if (is_on) {
+		val &= ~(DSPS_USBPHY_CM_PWRDN | DSPS_USBPHY_OTG_PWRDN);
+		val |= DSPS_USBPHY_OTGVDET_EN |
+			DSPS_USBPHY_OTGSESSEND_EN;
+	} else
+		val |= DSPS_USBPHY_CM_PWRDN | DSPS_USBPHY_OTG_PWRDN;
+
+	writel(val, dsps_phy->phy_ctrl);
+}
+
+static void dsps_usbphy_wakeup(struct usb_phy *phy, bool enable)
+{
+	struct dsps_phy *dsps_phy = phy_to_dspsphy(phy);
+	int id = dsps_phy->id;
+	u32 val, wkup_flag;
+
+	val = readl(dsps_phy->phy_wkup);
+	wkup_flag = id ? DSPS_USB1_WKUP_CTRL_ENABLE :
+			DSPS_USB0_WKUP_CTRL_ENABLE;
+
+	if (enable)
+		val |= wkup_flag;
+	else
+		val &= ~wkup_flag;
+
+	writel(val, dsps_phy->phy_wkup);
+}
+
+static int dsps_usbphy_suspend(struct usb_phy *x, int suspend)
+{
+	struct dsps_phy *dsps_phy = phy_to_dspsphy(x);
+
+	if (suspend) {
+		if (!pm_runtime_suspended(&dsps_phy->pdev->dev))
+			pm_runtime_put(&dsps_phy->pdev->dev);
+	} else if (!suspend)
+		pm_runtime_get(&dsps_phy->pdev->dev);
+
+	return 0;
+}
+
+static int dsps_usbphy_init(struct usb_phy *phy)
+{
+	/* enable the phy */
+	dsps_usbphy_power(phy, 1);
+
+	return 0;
+}
+
+static void dsps_usbphy_shutdown(struct usb_phy *phy)
+{
+	/* disable the phy */
+	dsps_usbphy_power(phy, 0);
+}
+
+static int dsps_usbphy_probe(struct platform_device *pdev)
+{
+	struct device_node *np = pdev->dev.of_node;
+	struct dsps_phy	*phy;
+	struct usb_otg *otg;
+	struct resource *res;
+
+	phy = devm_kzalloc(&pdev->dev, sizeof(*phy), GFP_KERNEL);
+	if (!phy) {
+		dev_err(&pdev->dev, "unable to allocate memory for USB2 PHY\n");
+		return -ENOMEM;
+	}
+
+	otg = devm_kzalloc(&pdev->dev, sizeof(*otg), GFP_KERNEL);
+	if (!otg) {
+		dev_err(&pdev->dev, "unable to allocate memory for USB OTG\n");
+		return -ENOMEM;
+	}
+
+	phy->dev		= &pdev->dev;
+	phy->pdev		= pdev;
+
+	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "phy_ctrl");
+	phy->phy_ctrl = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(phy->phy_ctrl))
+		return PTR_ERR(phy->phy_ctrl);
+
+	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "phy_wkup");
+	phy->phy_wkup = ioremap(res->start, resource_size(res));
+	if (IS_ERR(phy->phy_wkup))
+		return PTR_ERR(phy->phy_wkup);
+
+	if (np)
+		of_property_read_u32(np, "id", &phy->id);
+
+	phy->phy.dev		= phy->dev;
+	phy->phy.label		= "dsps-usbphy";
+	phy->phy.otg		= otg;
+	phy->phy.type		= USB_PHY_TYPE_USB2;
+	phy->phy.init		= dsps_usbphy_init;
+	phy->phy.shutdown	= dsps_usbphy_shutdown;
+	phy->phy.set_suspend	= dsps_usbphy_suspend;
+	otg->phy		= &phy->phy;
+
+	usb_add_phy_dev(&phy->phy);
+
+	platform_set_drvdata(pdev, phy);
+
+	pm_runtime_enable(phy->dev);
+
+	return 0;
+}
+
+static int dsps_usbphy_remove(struct platform_device *pdev)
+{
+	struct dsps_phy	*phy = platform_get_drvdata(pdev);
+
+	dsps_usbphy_power(&phy->phy, 0);
+	iounmap(phy->phy_wkup);
+	usb_remove_phy(&phy->phy);
+
+	if (!pm_runtime_suspended(&pdev->dev))
+		pm_runtime_put(&pdev->dev);
+	pm_runtime_disable(&pdev->dev);
+
+	return 0;
+}
+
+#ifdef CONFIG_PM_RUNTIME
+
+static int dsps_usbphy_runtime_suspend(struct device *dev)
+{
+	struct dsps_phy	*dsps_phy = dev_get_drvdata(dev);
+
+	/* suspend usb-phy */
+	dsps_usbphy_power(&dsps_phy->phy, 0);
+	dsps_phy->is_suspended = 1;
+
+	return 0;
+}
+
+static int dsps_usbphy_runtime_resume(struct device *dev)
+{
+	struct dsps_phy	*dsps_phy = dev_get_drvdata(dev);
+
+	/* resume usb-phy */
+	dsps_usbphy_power(&dsps_phy->phy, 1);
+	dsps_phy->is_suspended = 0;
+
+	return 0;
+}
+
+static const struct dev_pm_ops dsps_usbphy_pm_ops = {
+	SET_RUNTIME_PM_OPS(dsps_usbphy_runtime_suspend,
+			dsps_usbphy_runtime_resume, NULL)
+};
+
+#define DEV_PM_OPS     (&dsps_usbphy_pm_ops)
+#else
+#define DEV_PM_OPS     NULL
+#endif
+
+#ifdef CONFIG_OF
+static const struct of_device_id dsps_usbphy_id_table[] = {
+	{ .compatible = "ti,dsps-usbphy" },
+	{}
+};
+MODULE_DEVICE_TABLE(of, dsps_usbphy_id_table);
+#endif
+
+static struct platform_driver dsps_usbphy_driver = {
+	.probe		= dsps_usbphy_probe,
+	.remove		= dsps_usbphy_remove,
+	.driver		= {
+		.name	= "dsps-usbphy",
+		.owner	= THIS_MODULE,
+		.pm	= DEV_PM_OPS,
+		.of_match_table = of_match_ptr(dsps_usbphy_id_table),
+	},
+};
+
+module_platform_driver(dsps_usbphy_driver);
+
+MODULE_ALIAS("platform: dsps_usbphy");
+MODULE_AUTHOR("Ravi Babu <ravibabu@xxxxxx>");
+MODULE_DESCRIPTION("dsps USB2 phy driver");
+MODULE_LICENSE("GPL v2");
-- 
1.7.0.4

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