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. Changes since previous version: - Bandgap and usb phy: drivers are now independent from control module driver, they use their own API functions. Dependency was removed from Kconfig. - Bandgap and usb phy: Added private spinlocks for bandgap and usb drivers. (p.s. the mailbox for musb in omap4 is present in system control module) [kishon@xxxxxx: wrote the original API's related to USB functions] Signed-off-by: Konstantin Baydarov <kbaidarov@xxxxxxxxxxxxx> Signed-off-by: Kishon Vijay Abraham I <kishon@xxxxxx> Signed-off-by: Eduardo Valentin <eduardo.valentin@xxxxxx> --- drivers/usb/otg/Kconfig | 12 ++ drivers/usb/otg/Makefile | 1 drivers/usb/otg/omap4-usb-phy.c | 167 ++++++++++++++++++++++++++++++++++++++ include/linux/usb/omap4_usb_phy.h | 53 ++++++++++++ 4 files changed, 233 insertions(+) Index: linux-2.6/drivers/usb/otg/Kconfig =================================================================== --- linux-2.6.orig/drivers/usb/otg/Kconfig +++ linux-2.6/drivers/usb/otg/Kconfig @@ -78,6 +78,18 @@ 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" + 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 Index: linux-2.6/drivers/usb/otg/Makefile =================================================================== --- linux-2.6.orig/drivers/usb/otg/Makefile +++ linux-2.6/drivers/usb/otg/Makefile @@ -13,6 +13,7 @@ obj-$(CONFIG_USB_GPIO_VBUS) += gpio_vbus obj-$(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 Index: linux-2.6/drivers/usb/otg/omap4-usb-phy.c =================================================================== --- /dev/null +++ linux-2.6/drivers/usb/otg/omap4-usb-phy.c @@ -0,0 +1,167 @@ +/* + * OMAP4 system control module driver, USB control children + * + * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com/ + * + * Contact: + * Kishon Vijay Abraham I <kishon@xxxxxx> + * Eduardo Valentin <eduardo.valentin@xxxxxx> + * + * 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/gpio.h> +#include <linux/delay.h> +#include <linux/err.h> +#include <linux/platform_device.h> +#include <linux/usb/omap4_usb_phy.h> + +void __iomem *omap_usb_phy_base; +spinlock_t omap_usb_phy_lock; + +static int omap_usb_phy_readl(u32 reg, u32 *val) +{ + if (!omap_usb_phy_base) + return -EINVAL; + + *val = __raw_readl(omap_usb_phy_base + reg); + return 0; +} + +/* + * TODO: Get rid from omap_usb_phy_writel() return value - + * It's useless. + */ +static int omap_usb_phy_writel(u32 val, u32 reg) +{ + unsigned long flags; + + if (!omap_usb_phy_base) + return -EINVAL; + + spin_lock_irqsave(&omap_usb_phy_lock, flags); + __raw_writel(val, omap_usb_phy_base + reg); + spin_unlock_irqrestore(&omap_usb_phy_lock, flags); + return 0; +} + +/** + * 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_usb_phy_readl(CONTROL_DEV_CONF, &val); + if (!ret && (val & PHY_PD)) { + ret = omap_usb_phy_writel(~PHY_PD, + CONTROL_DEV_CONF); + /* XXX: add proper documentation for this delay */ + mdelay(200); + } + } else + ret = omap_usb_phy_writel(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_usb_phy_writel(val, CONTROL_USBOTGHS_CONTROL); +} +EXPORT_SYMBOL_GPL(omap4_usb_phy_mailbox); + +static int __devinit omap_usb_phy_probe(struct platform_device *pdev) +{ + struct resource *io_res; + +// printk("\n\t\t **** omap_usb_phy_probe(): enter "); + + io_res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!io_res) + return -ENOENT; + +// printk("\n\t\t **** omap_usb_phy_probe(): start %x ", io_res->start); +// printk("\n\t\t **** omap_usb_phy_probe(): size %x ", resource_size(io_res)); + omap_usb_phy_base = ioremap(io_res->start, resource_size(io_res)); +// printk("\n\t\t **** omap_usb_phy_probe(): omap_usb_phy_base %x ", omap_usb_phy_base); + if (!omap_usb_phy_base) + return -ENOMEM; + + /* Initialize register lock */ + spin_lock_init(&omap_usb_phy_lock); + + 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."); Index: linux-2.6/include/linux/usb/omap4_usb_phy.h =================================================================== --- /dev/null +++ linux-2.6/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@xxxxxx> + * Eduardo Valentin <eduardo.valentin@xxxxxx> + * + * 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
