Message-ID: <1358239378-10030-2-git-send-email-kishon@ti.com>
Date:	Tue, 15 Jan 2013 14:12:52 +0530
From:	Kishon Vijay Abraham I <kishon@...com>
To:	<grant.likely@...retlab.ca>, <b-cousson@...com>,
	<rob.herring@...xeda.com>, <rob@...dley.net>,
	<linux@....linux.org.uk>, <arnd@...db.de>, <balbi@...com>,
	<tony@...mide.com>, <devicetree-discuss@...ts.ozlabs.org>,
	<linux-doc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-usb@...r.kernel.org>, <linux-omap@...r.kernel.org>
CC:	Kishon Vijay Abraham I <kishon@...com>
Subject: [RFC PATCH 1/7] drivers: usb: phy: add a new driver for usb part of control module

Added a new driver for the usb part of control module. This has an API
to power on the USB2 phy and an API to write to the mailbox depending on
whether MUSB has to act in host mode or in device mode.

Writing to control module registers for doing the above task which was
previously done in omap glue and in omap-usb2 phy will be removed.

Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
---
 Documentation/devicetree/bindings/usb/omap-usb.txt |   21 +-
 drivers/usb/phy/Kconfig                            |    9 +
 drivers/usb/phy/Makefile                           |    1 +
 drivers/usb/phy/omap-control-usb.c                 |  204 ++++++++++++++++++++
 include/linux/usb/omap_control_usb.h               |   73 +++++++
 5 files changed, 307 insertions(+), 1 deletion(-)
 create mode 100644 drivers/usb/phy/omap-control-usb.c
 create mode 100644 include/linux/usb/omap_control_usb.h

diff --git a/Documentation/devicetree/bindings/usb/omap-usb.txt b/Documentation/devicetree/bindings/usb/omap-usb.txt
index 29a043e..d58dae3 100644
--- a/Documentation/devicetree/bindings/usb/omap-usb.txt
+++ b/Documentation/devicetree/bindings/usb/omap-usb.txt
@@ -1,4 +1,4 @@
-OMAP GLUE
+OMAP GLUE AND OTHER OMAP SPECIFIC COMPONENTS
 
 OMAP MUSB GLUE
  - compatible : Should be "ti,omap4-musb" or "ti,omap3-musb"
@@ -31,3 +31,22 @@ Board specific device node entry
 	mode = <3>;
 	power = <50>;
 };
+
+OMAP CONTROL USB
+
+Required properties:
+ - compatible: Should be "ti,omap-control-usb"
+ - reg : Address and length of the register set for the device. It contains
+   the address of "control_dev_conf" and "otghs_control".
+ - reg-names: The names of the register addresses corresponding to the registers
+   filled in "reg".
+ - ti,has_mailbox: This is used to specify if the platform uses mailbox in
+   control module.
+
+omap_control_usb@...02300 {
+	compatible = "ti,omap-control-usb";
+	reg = <0x4a002300 0x4>,
+	      <0x4a00233c 0x4>;
+	reg-names = "control_dev_conf", "otghs_control";
+	ti,has_mailbox;
+};
diff --git a/drivers/usb/phy/Kconfig b/drivers/usb/phy/Kconfig
index 5de6e7f..a7277ee 100644
--- a/drivers/usb/phy/Kconfig
+++ b/drivers/usb/phy/Kconfig
@@ -14,6 +14,15 @@ config OMAP_USB2
 	  The USB OTG controller communicates with the comparator using this
 	  driver.
 
+config OMAP_CONTROL_USB
+	tristate "OMAP CONTROL USB Driver"
+	depends on ARCH_OMAP2PLUS
+	help
+	  Enable this to add support for the USB part present in the control
+	  module. This driver has API to power on the PHY and to write to the
+	  mailbox. The mailbox is present only in omap4 and the register to
+	  power on the PHY is present in omap4 and omap5.
+
 config USB_ISP1301
 	tristate "NXP ISP1301 USB transceiver support"
 	depends on USB || USB_GADGET
diff --git a/drivers/usb/phy/Makefile b/drivers/usb/phy/Makefile
index 1a579a8..0dea4d2 100644
--- a/drivers/usb/phy/Makefile
+++ b/drivers/usb/phy/Makefile
@@ -5,6 +5,7 @@
 ccflags-$(CONFIG_USB_DEBUG) := -DDEBUG
 
 obj-$(CONFIG_OMAP_USB2)			+= omap-usb2.o
+obj-$(CONFIG_OMAP_CONTROL_USB)		+= omap-control-usb.o
 obj-$(CONFIG_USB_ISP1301)		+= isp1301.o
 obj-$(CONFIG_MV_U3D_PHY)		+= mv_u3d_phy.o
 obj-$(CONFIG_USB_EHCI_TEGRA)	+= tegra_usb_phy.o
diff --git a/drivers/usb/phy/omap-control-usb.c b/drivers/usb/phy/omap-control-usb.c
new file mode 100644
index 0000000..bed41a9
--- /dev/null
+++ b/drivers/usb/phy/omap-control-usb.c
@@ -0,0 +1,204 @@
+/*
+ * 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@...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/usb/omap_control_usb.h>
+
+static struct omap_control_usb *control_usb;
+
+/**
+ * get_omap_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 passed to all other API's
+ * in this driver.
+ *
+ * To be used by PHY driver and glue driver
+ */
+struct device *get_omap_control_dev(void)
+{
+	if (!control_usb)
+		return ERR_PTR(-ENODEV);
+
+	return control_usb->dev;
+}
+EXPORT_SYMBOL_GPL(get_omap_control_dev);
+
+/**
+ * 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);
+
+	if (on) {
+		val = readl(control_usb->dev_conf);
+		if (val & PHY_PD)
+			writel(~PHY_PD, control_usb->dev_conf);
+	} else {
+		writel(PHY_PD, 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
+ * @dev: struct device *
+ *
+ * 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_host_mode(struct device *dev)
+{
+	u32 val;
+	struct omap_control_usb	*control_usb = dev_get_drvdata(dev);
+
+	val = AVALID | VBUSVALID;
+
+	writel(val, control_usb->otghs_control);
+}
+EXPORT_SYMBOL_GPL(omap_control_usb_host_mode);
+
+/**
+ * omap_control_usb_device_mode - set AVALID, VBUSVALID and ID pin in high
+ * impedance
+ * @dev: struct device *
+ *
+ * This is an API to write to the mailbox register to notify the usb core that
+ * it has been connected to a usb host.
+ */
+void omap_control_usb_device_mode(struct device *dev)
+{
+	u32 val;
+	struct omap_control_usb	*control_usb = dev_get_drvdata(dev);
+
+	val = IDDIG | AVALID | VBUSVALID;
+
+	writel(val, control_usb->otghs_control);
+}
+EXPORT_SYMBOL_GPL(omap_control_usb_device_mode);
+
+/**
+ * omap_control_usb_set_sessionend - Enable SESSIONEND and IDIG to high
+ * impedance
+ * @dev: struct device *
+ *
+ * This is an API to write to the mailbox register to notify the usb core
+ * it's now in disconnected state.
+ */
+void omap_control_usb_set_sessionend(struct device *dev)
+{
+	u32 val;
+	struct omap_control_usb	*control_usb = dev_get_drvdata(dev);
+
+	val = SESSEND | IDDIG;
+
+	writel(val, control_usb->otghs_control);
+}
+EXPORT_SYMBOL_GPL(omap_control_usb_set_sessionend);
+
+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) {
+		control_usb->has_mailbox = of_property_read_bool(np,
+		    "ti,has_mailbox");
+	} else if (pdata) {
+		control_usb->has_mailbox = pdata->has_mailbox;
+	} 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 == NULL) {
+		dev_err(&pdev->dev, "Failed to obtain io memory\n");
+		return -ENXIO;
+	}
+
+	if (control_usb->has_mailbox) {
+		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 == NULL) {
+			dev_err(&pdev->dev, "Failed to obtain io memory\n");
+			return -ENXIO;
+		}
+	}
+
+	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 USB DRIVER");
+MODULE_LICENSE("GPL v2");
diff --git a/include/linux/usb/omap_control_usb.h b/include/linux/usb/omap_control_usb.h
new file mode 100644
index 0000000..fbc7407
--- /dev/null
+++ b/include/linux/usb/omap_control_usb.h
@@ -0,0 +1,73 @@
+/*
+ * 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@...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;
+
+	u8 has_mailbox:1;
+};
+
+struct omap_control_usb_platform_data {
+	u8 has_mailbox:1;
+};
+
+#define	PHY_PD		BIT(0)
+
+#define	AVALID		BIT(0)
+#define	BVALID		BIT(1)
+#define	VBUSVALID	BIT(2)
+#define	SESSEND		BIT(3)
+#define	IDDIG		BIT(4)
+
+#if (defined(CONFIG_OMAP_CONTROL_USB) || \
+				defined(CONFIG_OMAP_CONTROL_USB_MODULE))
+extern struct device *get_omap_control_dev(void);
+extern void omap_control_usb_phy_power(struct device *dev, int on);
+extern void omap_control_usb_host_mode(struct device *dev);
+extern void omap_control_usb_device_mode(struct device *dev);
+extern void omap_control_usb_set_sessionend(struct device *dev);
+#else
+static inline struct device *get_omap_control_dev()
+{
+	return ERR_PTR(-ENODEV);
+}
+
+static inline void omap_control_usb_phy_power(struct device *dev, int on)
+{
+}
+
+static inline void omap_control_usb_host_mode(struct device *dev)
+{
+}
+
+static inline void omap_control_usb_device_mode(struct device *dev)
+{
+}
+
+static inline void omap_control_usb_set_sessionend(struct device *dev)
+{
+}
+#endif
+
+#endif	/* __OMAP_CONTROL_USB_H__ */
-- 
1.7.9.5

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