[RFC PATCH 07/11] mfd: omap: control: usb-phy: introduce the ctrl-module usb driver
Eduardo Valentin
eduardo.valentin at ti.com
Fri May 25 04:25:57 EDT 2012
Created a new platform driver for the platform device created by the
control module mfd core, wrt usb. This driver has API's to power on/off
the phy and the API's to write to musb mailbox.
(p.s. the mailbox for musb in omap4 is present in system control
module)
[kishon at ti.com: wrote the original API's related to USB functions]
Signed-off-by: Kishon Vijay Abraham I <kishon at ti.com>
Signed-off-by: Eduardo Valentin <eduardo.valentin at ti.com>
---
drivers/usb/otg/Kconfig | 13 ++++
drivers/usb/otg/Makefile | 1 +
drivers/usb/otg/omap4-usb-phy.c | 130 +++++++++++++++++++++++++++++++++++++
include/linux/usb/omap4_usb_phy.h | 53 +++++++++++++++
4 files changed, 197 insertions(+), 0 deletions(-)
create mode 100644 drivers/usb/otg/omap4-usb-phy.c
create mode 100644 include/linux/usb/omap4_usb_phy.h
diff --git a/drivers/usb/otg/Kconfig b/drivers/usb/otg/Kconfig
index 5c87db0..e2840f1 100644
--- a/drivers/usb/otg/Kconfig
+++ b/drivers/usb/otg/Kconfig
@@ -78,6 +78,19 @@ config TWL6030_USB
are hooked to this driver through platform_data structure.
The definition of internal PHY APIs are in the mach-omap2 layer.
+config OMAP4_USB_PHY
+ tristate "Texas Instruments OMAP4+ USB pin control driver"
+ depends on MFD_OMAP_CONTROL
+ help
+ If you say yes here you get support for the Texas Instruments
+ OMAP4+ USB pin control driver. The register set is part of system
+ control module.
+
+ USB phy in OMAP configures control module register for powering on
+ the phy, configuring VBUSVALID, AVALID, IDDIG and SESSEND. For
+ performing the above mentioned configuration, API's are added in
+ by this children of the control module driver.
+
config NOP_USB_XCEIV
tristate "NOP USB Transceiver Driver"
select USB_OTG_UTILS
diff --git a/drivers/usb/otg/Makefile b/drivers/usb/otg/Makefile
index 41aa509..60c8c83 100644
--- a/drivers/usb/otg/Makefile
+++ b/drivers/usb/otg/Makefile
@@ -13,6 +13,7 @@ obj-$(CONFIG_USB_GPIO_VBUS) += gpio_vbus.o
obj-$(CONFIG_ISP1301_OMAP) += isp1301_omap.o
obj-$(CONFIG_TWL4030_USB) += twl4030-usb.o
obj-$(CONFIG_TWL6030_USB) += twl6030-usb.o
+obj-$(CONFIG_OMAP4_USB_PHY) += omap4-usb-phy.o
obj-$(CONFIG_NOP_USB_XCEIV) += nop-usb-xceiv.o
obj-$(CONFIG_USB_ULPI) += ulpi.o
obj-$(CONFIG_USB_ULPI_VIEWPORT) += ulpi_viewport.o
diff --git a/drivers/usb/otg/omap4-usb-phy.c b/drivers/usb/otg/omap4-usb-phy.c
new file mode 100644
index 0000000..a29ea45
--- /dev/null
+++ b/drivers/usb/otg/omap4-usb-phy.c
@@ -0,0 +1,130 @@
+/*
+ * OMAP4 system control module driver, USB control children
+ *
+ * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com/
+ *
+ * Contact:
+ * Kishon Vijay Abraham I <kishon at ti.com>
+ * Eduardo Valentin <eduardo.valentin at ti.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/platform_device.h>
+#include <linux/mfd/omap_control.h>
+#include <linux/usb/omap4_usb_phy.h>
+
+/**
+ * omap4_usb_phy_power - power on/off the phy using control module reg
+ * @dev: struct device *
+ * @on: 0 or 1, based on powering on or off the PHY
+ *
+ * omap_usb2 can call this API to power on or off the PHY.
+ */
+int omap4_usb_phy_power(struct device *dev, int on)
+{
+ u32 val;
+ int ret;
+
+ if (on) {
+ ret = omap_control_readl(dev, CONTROL_DEV_CONF, &val);
+ if (!ret && (val & PHY_PD)) {
+ ret = omap_control_writel(dev, ~PHY_PD,
+ CONTROL_DEV_CONF);
+ /* XXX: add proper documentation for this delay */
+ mdelay(200);
+ }
+ } else {
+ ret = omap_control_writel(dev, PHY_PD, CONTROL_DEV_CONF);
+ }
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(omap4_usb_phy_power);
+
+/**
+ * omap4_usb_phy_mailbox - write to usb otg mailbox
+ * @dev: struct device *
+ * @val: the value to be written to the mailbox
+ *
+ * On detection of a device (ID pin is grounded), the phy should call this API
+ * to set AVALID, VBUSVALID and ID pin is grounded.
+ *
+ * When OMAP is connected to a host (OMAP in device mode), the phy should call
+ * this API to set AVALID, VBUSVALID and ID pin in high impedance.
+ *
+ * The phy should call this API, if OMAP is disconnected from host or device.
+ */
+int omap4_usb_phy_mailbox(struct device *dev, u32 val)
+{
+ return omap_control_writel(dev, val, CONTROL_USBOTGHS_CONTROL);
+}
+EXPORT_SYMBOL_GPL(omap4_usb_phy_mailbox);
+
+static int __devinit omap_usb_phy_probe(struct platform_device *pdev)
+{
+ struct omap_control *omap_control;
+
+ omap_control = dev_get_drvdata(pdev->dev.parent);
+
+ if (!omap_control) {
+ dev_err(&pdev->dev, "no omap_control in our parent\n");
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int __devexit omap_usb_phy_remove(struct platform_device *pdev)
+{
+ return 0;
+}
+
+static const struct of_device_id of_omap_usb_phy_match[] = {
+ { .compatible = "ti,omap4-usb-phy", },
+ { },
+};
+
+static struct platform_driver omap_usb_phy_driver = {
+ .probe = omap_usb_phy_probe,
+ .remove = __devexit_p(omap_usb_phy_remove),
+ .driver = {
+ .name = "omap4-usb-phy",
+ .owner = THIS_MODULE,
+ .of_match_table = of_omap_usb_phy_match,
+ },
+};
+
+static int __init omap_usb_phy_init(void)
+{
+ return platform_driver_register(&omap_usb_phy_driver);
+}
+postcore_initcall(omap_usb_phy_init);
+
+static void __exit omap_usb_phy_exit(void)
+{
+ platform_driver_unregister(&omap_usb_phy_driver);
+}
+module_exit(omap_usb_phy_exit);
+
+MODULE_DESCRIPTION("OMAP4+ USB-phy driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform: omap4-usb-phy");
+MODULE_AUTHOR("Texas Instrument Inc.");
diff --git a/include/linux/usb/omap4_usb_phy.h b/include/linux/usb/omap4_usb_phy.h
new file mode 100644
index 0000000..b6a4701
--- /dev/null
+++ b/include/linux/usb/omap4_usb_phy.h
@@ -0,0 +1,53 @@
+/*
+ * OMAP4 USB-phy
+ *
+ * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com/
+ *
+ * Contact:
+ * Kishon Vijay Abraham I <kishon at ti.com>
+ * Eduardo Valentin <eduardo.valentin at ti.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ *
+ */
+
+#ifndef __OMAP4_USB_PHY_H
+#define __OMAP4_USB_PHY_H
+
+#define PHY_PD 0x1
+#define AVALID BIT(0)
+#define BVALID BIT(1)
+#define VBUSVALID BIT(2)
+#define SESSEND BIT(3)
+#define IDDIG BIT(4)
+#define CONTROL_DEV_CONF 0x00000300
+#define CONTROL_USBOTGHS_CONTROL 0x0000033C
+
+/* USB-PHY helpers */
+#if (defined(CONFIG_OMAP4_USB_PHY)) || (defined(CONFIG_OMAP4_USB_PHY_MODULE))
+extern int omap4_usb_phy_mailbox(struct device *dev, u32 val);
+extern int omap4_usb_phy_power(struct device *dev, int on);
+#else
+static inline int omap4_usb_phy_mailbox(struct device *dev, u32 val)
+{
+ return 0;
+}
+static inline int omap4_usb_phy_power(struct device *dev, int on)
+{
+ return 0;
+}
+#endif
+
+#endif
--
1.7.7.1.488.ge8e1c
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