From b8da8677d4f88db066c1cfe34529d970a060de46 Mon Sep 17 00:00:00 2001 From: David Brownell Date: Mon, 24 Nov 2008 11:53:35 -0800 Subject: USB: move isp1301_omap to drivers/usb/otg This moves the isp1301-omap driver from the drivers/i2c/chips directory (which will be shrinking) into a new drivers/usb/otg directory (which will grow, with more drivers and utilities). Note that OTG infrastructure needs to be initialized before either host or peripheral side USB support, and may be needed before for pure host or pure peripheral configurations. Signed-off-by: David Brownell Acked-by: Jean Delvare Signed-off-by: Greg Kroah-Hartman --- drivers/usb/otg/Makefile | 8 ++++++++ 1 file changed, 8 insertions(+) create mode 100644 drivers/usb/otg/Makefile (limited to 'drivers/usb/otg/Makefile') diff --git a/drivers/usb/otg/Makefile b/drivers/usb/otg/Makefile new file mode 100644 index 000000000000..483816685d00 --- /dev/null +++ b/drivers/usb/otg/Makefile @@ -0,0 +1,8 @@ +obj-$(CONFIG_ISP1301_OMAP) += isp1301_omap.o + +ifeq ($(CONFIG_USB_DEBUG),y) +EXTRA_CFLAGS += -DDEBUG +else ifeq ($(CONFIG_USB_GADGET_DEBUG),y) +EXTRA_CFLAGS += -DDEBUG +endif + -- cgit v1.2.3-59-g8ed1b From 6084f1bf0c51a99cbba612ee90a4607cffb8b042 Mon Sep 17 00:00:00 2001 From: Philipp Zabel Date: Mon, 24 Nov 2008 12:00:01 -0800 Subject: USB: otg: gpio_vbus transceiver stub gpio_vbus provides simple GPIO VBUS sensing for peripheral controllers with an internal transceiver. Optionally, a second GPIO can be used to control D+ pullup. It also interfaces with the regulator framework to limit charging currents when powered via USB. gpio_vbus requests the regulator supplying "vbus_draw" and can enable/disable it or limit its current depending on USB state. [dbrownell@users.sourceforge.net: use drivers/otg, cleanups ] Signed-off-by: Philipp Zabel Signed-off-by: David Brownell Signed-off-by: Greg Kroah-Hartman --- drivers/usb/otg/Kconfig | 13 ++ drivers/usb/otg/Makefile | 5 + drivers/usb/otg/gpio_vbus.c | 335 ++++++++++++++++++++++++++++++++++++++++++ include/linux/usb/gpio_vbus.h | 30 ++++ 4 files changed, 383 insertions(+) create mode 100644 drivers/usb/otg/gpio_vbus.c create mode 100644 include/linux/usb/gpio_vbus.h (limited to 'drivers/usb/otg/Makefile') diff --git a/drivers/usb/otg/Kconfig b/drivers/usb/otg/Kconfig index 860342902bbb..afe91bfea7f2 100644 --- a/drivers/usb/otg/Kconfig +++ b/drivers/usb/otg/Kconfig @@ -14,6 +14,19 @@ config USB_OTG_UTILS Select this to make sure the build includes objects from the OTG infrastructure directory. +# +# USB Transceiver Drivers +# +config USB_GPIO_VBUS + tristate "GPIO based peripheral-only VBUS sensing 'transceiver'" + depends on GENERIC_GPIO + select USB_OTG_UTILS + help + Provides simple GPIO VBUS sensing for controllers with an + internal transceiver via the otg_transceiver interface, and + optionally control of a D+ pullup GPIO as well as a VBUS + current limit regulator. + config ISP1301_OMAP tristate "Philips ISP1301 with OMAP OTG" depends on I2C && ARCH_OMAP_OTG diff --git a/drivers/usb/otg/Makefile b/drivers/usb/otg/Makefile index 483816685d00..6c58b36ca7cf 100644 --- a/drivers/usb/otg/Makefile +++ b/drivers/usb/otg/Makefile @@ -1,3 +1,8 @@ +# +# OTG infrastructure and transceiver drivers +# + +obj-$(CONFIG_USB_GPIO_VBUS) += gpio_vbus.o obj-$(CONFIG_ISP1301_OMAP) += isp1301_omap.o ifeq ($(CONFIG_USB_DEBUG),y) diff --git a/drivers/usb/otg/gpio_vbus.c b/drivers/usb/otg/gpio_vbus.c new file mode 100644 index 000000000000..63a6036f04be --- /dev/null +++ b/drivers/usb/otg/gpio_vbus.c @@ -0,0 +1,335 @@ +/* + * gpio-vbus.c - simple GPIO VBUS sensing driver for B peripheral devices + * + * Copyright (c) 2008 Philipp Zabel + * + * 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. + */ + +#include +#include +#include +#include +#include + +#include + +#include +#include +#include + + +/* + * A simple GPIO VBUS sensing driver for B peripheral only devices + * with internal transceivers. It can control a D+ pullup GPIO and + * a regulator to limit the current drawn from VBUS. + * + * Needs to be loaded before the UDC driver that will use it. + */ +struct gpio_vbus_data { + struct otg_transceiver otg; + struct device *dev; + struct regulator *vbus_draw; + int vbus_draw_enabled; + unsigned mA; +}; + + +/* + * This driver relies on "both edges" triggering. VBUS has 100 msec to + * stabilize, so the peripheral controller driver may need to cope with + * some bouncing due to current surges (e.g. charging local capacitance) + * and contact chatter. + * + * REVISIT in desperate straits, toggling between rising and falling + * edges might be workable. + */ +#define VBUS_IRQ_FLAGS \ + ( IRQF_SAMPLE_RANDOM | IRQF_SHARED \ + | IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING ) + + +/* interface to regulator framework */ +static void set_vbus_draw(struct gpio_vbus_data *gpio_vbus, unsigned mA) +{ + struct regulator *vbus_draw = gpio_vbus->vbus_draw; + int enabled; + + if (!vbus_draw) + return; + + enabled = gpio_vbus->vbus_draw_enabled; + if (mA) { + regulator_set_current_limit(vbus_draw, 0, 1000 * mA); + if (!enabled) { + regulator_enable(vbus_draw); + gpio_vbus->vbus_draw_enabled = 1; + } + } else { + if (enabled) { + regulator_disable(vbus_draw); + gpio_vbus->vbus_draw_enabled = 0; + } + } + gpio_vbus->mA = mA; +} + +/* VBUS change IRQ handler */ +static irqreturn_t gpio_vbus_irq(int irq, void *data) +{ + struct platform_device *pdev = data; + struct gpio_vbus_mach_info *pdata = pdev->dev.platform_data; + struct gpio_vbus_data *gpio_vbus = platform_get_drvdata(pdev); + int gpio, vbus; + + vbus = gpio_get_value(pdata->gpio_vbus); + if (pdata->gpio_vbus_inverted) + vbus = !vbus; + + dev_dbg(&pdev->dev, "VBUS %s (gadget: %s)\n", + vbus ? "supplied" : "inactive", + gpio_vbus->otg.gadget ? gpio_vbus->otg.gadget->name : "none"); + + if (!gpio_vbus->otg.gadget) + return IRQ_HANDLED; + + /* Peripheral controllers which manage the pullup themselves won't have + * gpio_pullup configured here. If it's configured here, we'll do what + * isp1301_omap::b_peripheral() does and enable the pullup here... although + * that may complicate usb_gadget_{,dis}connect() support. + */ + gpio = pdata->gpio_pullup; + if (vbus) { + gpio_vbus->otg.state = OTG_STATE_B_PERIPHERAL; + usb_gadget_vbus_connect(gpio_vbus->otg.gadget); + + /* drawing a "unit load" is *always* OK, except for OTG */ + set_vbus_draw(gpio_vbus, 100); + + /* optionally enable D+ pullup */ + if (gpio_is_valid(gpio)) + gpio_set_value(gpio, !pdata->gpio_pullup_inverted); + } else { + /* optionally disable D+ pullup */ + if (gpio_is_valid(gpio)) + gpio_set_value(gpio, pdata->gpio_pullup_inverted); + + set_vbus_draw(gpio_vbus, 0); + + usb_gadget_vbus_disconnect(gpio_vbus->otg.gadget); + gpio_vbus->otg.state = OTG_STATE_B_IDLE; + } + + return IRQ_HANDLED; +} + +/* OTG transceiver interface */ + +/* bind/unbind the peripheral controller */ +static int gpio_vbus_set_peripheral(struct otg_transceiver *otg, + struct usb_gadget *gadget) +{ + struct gpio_vbus_data *gpio_vbus; + struct gpio_vbus_mach_info *pdata; + struct platform_device *pdev; + int gpio, irq; + + gpio_vbus = container_of(otg, struct gpio_vbus_data, otg); + pdev = to_platform_device(gpio_vbus->dev); + pdata = gpio_vbus->dev->platform_data; + irq = gpio_to_irq(pdata->gpio_vbus); + gpio = pdata->gpio_pullup; + + if (!gadget) { + dev_dbg(&pdev->dev, "unregistering gadget '%s'\n", + otg->gadget->name); + + /* optionally disable D+ pullup */ + if (gpio_is_valid(gpio)) + gpio_set_value(gpio, pdata->gpio_pullup_inverted); + + set_vbus_draw(gpio_vbus, 0); + + usb_gadget_vbus_disconnect(otg->gadget); + otg->state = OTG_STATE_UNDEFINED; + + otg->gadget = NULL; + return 0; + } + + otg->gadget = gadget; + dev_dbg(&pdev->dev, "registered gadget '%s'\n", gadget->name); + + /* initialize connection state */ + gpio_vbus_irq(irq, pdev); + return 0; +} + +/* effective for B devices, ignored for A-peripheral */ +static int gpio_vbus_set_power(struct otg_transceiver *otg, unsigned mA) +{ + struct gpio_vbus_data *gpio_vbus; + + gpio_vbus = container_of(otg, struct gpio_vbus_data, otg); + + if (otg->state == OTG_STATE_B_PERIPHERAL) + set_vbus_draw(gpio_vbus, mA); + return 0; +} + +/* for non-OTG B devices: set/clear transceiver suspend mode */ +static int gpio_vbus_set_suspend(struct otg_transceiver *otg, int suspend) +{ + struct gpio_vbus_data *gpio_vbus; + + gpio_vbus = container_of(otg, struct gpio_vbus_data, otg); + + /* draw max 0 mA from vbus in suspend mode; or the previously + * recorded amount of current if not suspended + * + * NOTE: high powered configs (mA > 100) may draw up to 2.5 mA + * if they're wake-enabled ... we don't handle that yet. + */ + return gpio_vbus_set_power(otg, suspend ? 0 : gpio_vbus->mA); +} + +/* platform driver interface */ + +static int __init gpio_vbus_probe(struct platform_device *pdev) +{ + struct gpio_vbus_mach_info *pdata = pdev->dev.platform_data; + struct gpio_vbus_data *gpio_vbus; + struct resource *res; + int err, gpio, irq; + + if (!pdata || !gpio_is_valid(pdata->gpio_vbus)) + return -EINVAL; + gpio = pdata->gpio_vbus; + + gpio_vbus = kzalloc(sizeof(struct gpio_vbus_data), GFP_KERNEL); + if (!gpio_vbus) + return -ENOMEM; + + platform_set_drvdata(pdev, gpio_vbus); + gpio_vbus->dev = &pdev->dev; + gpio_vbus->otg.label = "gpio-vbus"; + gpio_vbus->otg.state = OTG_STATE_UNDEFINED; + gpio_vbus->otg.set_peripheral = gpio_vbus_set_peripheral; + gpio_vbus->otg.set_power = gpio_vbus_set_power; + gpio_vbus->otg.set_suspend = gpio_vbus_set_suspend; + + err = gpio_request(gpio, "vbus_detect"); + if (err) { + dev_err(&pdev->dev, "can't request vbus gpio %d, err: %d\n", + gpio, err); + goto err_gpio; + } + gpio_direction_input(gpio); + + res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); + if (res) { + irq = res->start; + res->flags &= IRQF_TRIGGER_MASK; + res->flags |= IRQF_SAMPLE_RANDOM | IRQF_SHARED; + } else + irq = gpio_to_irq(gpio); + + /* if data line pullup is in use, initialize it to "not pulling up" */ + gpio = pdata->gpio_pullup; + if (gpio_is_valid(gpio)) { + err = gpio_request(gpio, "udc_pullup"); + if (err) { + dev_err(&pdev->dev, + "can't request pullup gpio %d, err: %d\n", + gpio, err); + gpio_free(pdata->gpio_vbus); + goto err_gpio; + } + gpio_direction_output(gpio, pdata->gpio_pullup_inverted); + } + + err = request_irq(irq, gpio_vbus_irq, VBUS_IRQ_FLAGS, + "vbus_detect", pdev); + if (err) { + dev_err(&pdev->dev, "can't request irq %i, err: %d\n", + irq, err); + goto err_irq; + } + + /* only active when a gadget is registered */ + err = otg_set_transceiver(&gpio_vbus->otg); + if (err) { + dev_err(&pdev->dev, "can't register transceiver, err: %d\n", + err); + goto err_otg; + } + + gpio_vbus->vbus_draw = regulator_get(&pdev->dev, "vbus_draw"); + if (IS_ERR(gpio_vbus->vbus_draw)) { + dev_dbg(&pdev->dev, "can't get vbus_draw regulator, err: %ld\n", + PTR_ERR(gpio_vbus->vbus_draw)); + gpio_vbus->vbus_draw = NULL; + } + + return 0; +err_otg: + free_irq(irq, &pdev->dev); +err_irq: + if (gpio_is_valid(pdata->gpio_pullup)) + gpio_free(pdata->gpio_pullup); + gpio_free(pdata->gpio_vbus); +err_gpio: + platform_set_drvdata(pdev, NULL); + kfree(gpio_vbus); + return err; +} + +static int __exit gpio_vbus_remove(struct platform_device *pdev) +{ + struct gpio_vbus_data *gpio_vbus = platform_get_drvdata(pdev); + struct gpio_vbus_mach_info *pdata = pdev->dev.platform_data; + int gpio = pdata->gpio_vbus; + + regulator_put(gpio_vbus->vbus_draw); + + otg_set_transceiver(NULL); + + free_irq(gpio_to_irq(gpio), &pdev->dev); + if (gpio_is_valid(pdata->gpio_pullup)) + gpio_free(pdata->gpio_pullup); + gpio_free(gpio); + platform_set_drvdata(pdev, NULL); + kfree(gpio_vbus); + + return 0; +} + +/* NOTE: the gpio-vbus device may *NOT* be hotplugged */ + +MODULE_ALIAS("platform:gpio-vbus"); + +static struct platform_driver gpio_vbus_driver = { + .driver = { + .name = "gpio-vbus", + .owner = THIS_MODULE, + }, + .remove = __exit_p(gpio_vbus_remove), +}; + +static int __init gpio_vbus_init(void) +{ + return platform_driver_probe(&gpio_vbus_driver, gpio_vbus_probe); +} +module_init(gpio_vbus_init); + +static void __exit gpio_vbus_exit(void) +{ + platform_driver_unregister(&gpio_vbus_driver); +} +module_exit(gpio_vbus_exit); + +MODULE_DESCRIPTION("simple GPIO controlled OTG transceiver driver"); +MODULE_AUTHOR("Philipp Zabel"); +MODULE_LICENSE("GPL"); diff --git a/include/linux/usb/gpio_vbus.h b/include/linux/usb/gpio_vbus.h new file mode 100644 index 000000000000..d9f03ccc2d60 --- /dev/null +++ b/include/linux/usb/gpio_vbus.h @@ -0,0 +1,30 @@ +/* + * A simple GPIO VBUS sensing driver for B peripheral only devices + * with internal transceivers. + * Optionally D+ pullup can be controlled by a second GPIO. + * + * Copyright (c) 2008 Philipp Zabel + * + * 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. + * + */ + +/** + * struct gpio_vbus_mach_info - configuration for gpio_vbus + * @gpio_vbus: VBUS sensing GPIO + * @gpio_pullup: optional D+ or D- pullup GPIO (else negative/invalid) + * @gpio_vbus_inverted: true if gpio_vbus is active low + * @gpio_pullup_inverted: true if gpio_pullup is active low + * + * The VBUS sensing GPIO should have a pulldown, which will normally be + * part of a resistor ladder turning a 4.0V-5.25V level on VBUS into a + * value the GPIO detects as active. Some systems will use comparators. + */ +struct gpio_vbus_mach_info { + int gpio_vbus; + int gpio_pullup; + bool gpio_vbus_inverted; + bool gpio_pullup_inverted; +}; -- cgit v1.2.3-59-g8ed1b From 3cb22d658668234edbe6dcb165501e9ef0c0a059 Mon Sep 17 00:00:00 2001 From: Tony Lindgren Date: Mon, 24 Nov 2008 12:02:21 -0800 Subject: USB: otg: sharable otg transceiver ops Move otg_get/set/put_transceiver() from omap specific code to common otg.c so other upcoming drivers can share them. [ dbrownell@users.sourceforge.net: move to drivers/usb/otg, dox ] Signed-off-by: Tony Lindgren Signed-off-by: Felipe Balbi Signed-off-by: Philipp Zabel Signed-off-by: David Brownell Signed-off-by: Greg Kroah-Hartman --- arch/arm/plat-omap/usb.c | 38 ---------------------------- drivers/usb/otg/Makefile | 11 ++++---- drivers/usb/otg/otg.c | 65 ++++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 71 insertions(+), 43 deletions(-) create mode 100644 drivers/usb/otg/otg.c (limited to 'drivers/usb/otg/Makefile') diff --git a/arch/arm/plat-omap/usb.c b/arch/arm/plat-omap/usb.c index 2f88ca8b8f38..add0485703b5 100644 --- a/arch/arm/plat-omap/usb.c +++ b/arch/arm/plat-omap/usb.c @@ -77,44 +77,6 @@ /*-------------------------------------------------------------------------*/ -#if defined(CONFIG_ARCH_OMAP_OTG) || defined(CONFIG_USB_MUSB_OTG) - -static struct otg_transceiver *xceiv; - -/** - * otg_get_transceiver - find the (single) OTG transceiver driver - * - * Returns the transceiver driver, after getting a refcount to it; or - * null if there is no such transceiver. The caller is responsible for - * releasing that count. - */ -struct otg_transceiver *otg_get_transceiver(void) -{ - if (xceiv) - get_device(xceiv->dev); - return xceiv; -} -EXPORT_SYMBOL(otg_get_transceiver); - -void otg_put_transceiver(struct otg_transceiver *x) -{ - put_device(x->dev); -} -EXPORT_SYMBOL(otg_put_transceiver); - -int otg_set_transceiver(struct otg_transceiver *x) -{ - if (xceiv && x) - return -EBUSY; - xceiv = x; - return 0; -} -EXPORT_SYMBOL(otg_set_transceiver); - -#endif - -/*-------------------------------------------------------------------------*/ - #if defined(CONFIG_ARCH_OMAP_OTG) || defined(CONFIG_ARCH_OMAP15XX) static void omap2_usb_devconf_clear(u8 port, u32 mask) diff --git a/drivers/usb/otg/Makefile b/drivers/usb/otg/Makefile index 6c58b36ca7cf..7c80fc379e6a 100644 --- a/drivers/usb/otg/Makefile +++ b/drivers/usb/otg/Makefile @@ -2,12 +2,13 @@ # OTG infrastructure and transceiver drivers # +# infrastructure +obj-$(CONFIG_USB_OTG_UTILS) += otg.o + +# transceiver drivers obj-$(CONFIG_USB_GPIO_VBUS) += gpio_vbus.o obj-$(CONFIG_ISP1301_OMAP) += isp1301_omap.o -ifeq ($(CONFIG_USB_DEBUG),y) -EXTRA_CFLAGS += -DDEBUG -else ifeq ($(CONFIG_USB_GADGET_DEBUG),y) -EXTRA_CFLAGS += -DDEBUG -endif +ccflags-$(CONFIG_USB_DEBUG) += -DDEBUG +ccflags-$(CONFIG_USB_GADGET_DEBUG) += -DDEBUG diff --git a/drivers/usb/otg/otg.c b/drivers/usb/otg/otg.c new file mode 100644 index 000000000000..ff318fae7d4d --- /dev/null +++ b/drivers/usb/otg/otg.c @@ -0,0 +1,65 @@ +/* + * otg.c -- USB OTG utility code + * + * Copyright (C) 2004 Texas Instruments + * + * 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. + */ + +#include +#include + +#include + +static struct otg_transceiver *xceiv; + +/** + * otg_get_transceiver - find the (single) OTG transceiver + * + * Returns the transceiver driver, after getting a refcount to it; or + * null if there is no such transceiver. The caller is responsible for + * calling otg_put_transceiver() to release that count. + * + * For use by USB host and peripheral drivers. + */ +struct otg_transceiver *otg_get_transceiver(void) +{ + if (xceiv) + get_device(xceiv->dev); + return xceiv; +} +EXPORT_SYMBOL(otg_get_transceiver); + +/** + * otg_put_transceiver - release the (single) OTG transceiver + * @x: the transceiver returned by otg_get_transceiver() + * + * Releases a refcount the caller received from otg_get_transceiver(). + * + * For use by USB host and peripheral drivers. + */ +void otg_put_transceiver(struct otg_transceiver *x) +{ + put_device(x->dev); +} +EXPORT_SYMBOL(otg_put_transceiver); + +/** + * otg_set_transceiver - declare the (single) OTG transceiver + * @x: the USB OTG transceiver to be used; or NULL + * + * This call is exclusively for use by transceiver drivers, which + * coordinate the activities of drivers for host and peripheral + * controllers, and in some cases for VBUS current regulation. + */ +int otg_set_transceiver(struct otg_transceiver *x) +{ + if (xceiv && x) + return -EBUSY; + xceiv = x; + return 0; +} +EXPORT_SYMBOL(otg_set_transceiver); -- cgit v1.2.3-59-g8ed1b From 9ebd9616648bc0e47e7f8e1898c919305f1e6347 Mon Sep 17 00:00:00 2001 From: David Brownell Date: Thu, 18 Dec 2008 12:25:44 -0800 Subject: USB: otg: twl4030 transceiver driver Add driver for the high speed USB-OTG transceiver in TI's TWL4030 family of chips. Given this and various other pending patches, OMAP3 hardware like that from beagleboard.org, gumstix.com (Overo), and openpandora.org should now have basic USB host and peripheral connectivity with mainline kernels. Ditto for less widely-available boards. Signed-off-by: David Brownell Signed-off-by: Tony Lindgren Cc: Kevin Hilman Cc: Felipe Balbi Signed-off-by: Greg Kroah-Hartman --- drivers/usb/otg/Kconfig | 10 + drivers/usb/otg/Makefile | 1 + drivers/usb/otg/twl4030-usb.c | 721 ++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 732 insertions(+) create mode 100644 drivers/usb/otg/twl4030-usb.c (limited to 'drivers/usb/otg/Makefile') diff --git a/drivers/usb/otg/Kconfig b/drivers/usb/otg/Kconfig index afe91bfea7f2..8e8dbdb9b39b 100644 --- a/drivers/usb/otg/Kconfig +++ b/drivers/usb/otg/Kconfig @@ -41,4 +41,14 @@ config ISP1301_OMAP This driver can also be built as a module. If so, the module will be called isp1301_omap. +config TWL4030_USB + tristate "TWL4030 USB Transceiver Driver" + depends on TWL4030_CORE + select USB_OTG_UTILS + help + Enable this to support the USB OTG transceiver on TWL4030 + family chips (including the TWL5030 and TPS659x0 devices). + This transceiver supports high and full speed devices plus, + in host mode, low speed. + endif # USB || OTG diff --git a/drivers/usb/otg/Makefile b/drivers/usb/otg/Makefile index 7c80fc379e6a..d73c7cf5e2f7 100644 --- a/drivers/usb/otg/Makefile +++ b/drivers/usb/otg/Makefile @@ -8,6 +8,7 @@ obj-$(CONFIG_USB_OTG_UTILS) += otg.o # transceiver drivers obj-$(CONFIG_USB_GPIO_VBUS) += gpio_vbus.o obj-$(CONFIG_ISP1301_OMAP) += isp1301_omap.o +obj-$(CONFIG_TWL4030_USB) += twl4030-usb.o ccflags-$(CONFIG_USB_DEBUG) += -DDEBUG ccflags-$(CONFIG_USB_GADGET_DEBUG) += -DDEBUG diff --git a/drivers/usb/otg/twl4030-usb.c b/drivers/usb/otg/twl4030-usb.c new file mode 100644 index 000000000000..416e4410be02 --- /dev/null +++ b/drivers/usb/otg/twl4030-usb.c @@ -0,0 +1,721 @@ +/* + * twl4030_usb - TWL4030 USB transceiver, talking to OMAP OTG controller + * + * Copyright (C) 2004-2007 Texas Instruments + * Copyright (C) 2008 Nokia Corporation + * Contact: Felipe Balbi + * + * 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. + * + * 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., 675 Mass Ave, Cambridge, MA 02139, USA. + * + * Current status: + * - HS USB ULPI mode works. + * - 3-pin mode support may be added in future. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + + +/* Register defines */ + +#define VENDOR_ID_LO 0x00 +#define VENDOR_ID_HI 0x01 +#define PRODUCT_ID_LO 0x02 +#define PRODUCT_ID_HI 0x03 + +#define FUNC_CTRL 0x04 +#define FUNC_CTRL_SET 0x05 +#define FUNC_CTRL_CLR 0x06 +#define FUNC_CTRL_SUSPENDM (1 << 6) +#define FUNC_CTRL_RESET (1 << 5) +#define FUNC_CTRL_OPMODE_MASK (3 << 3) /* bits 3 and 4 */ +#define FUNC_CTRL_OPMODE_NORMAL (0 << 3) +#define FUNC_CTRL_OPMODE_NONDRIVING (1 << 3) +#define FUNC_CTRL_OPMODE_DISABLE_BIT_NRZI (2 << 3) +#define FUNC_CTRL_TERMSELECT (1 << 2) +#define FUNC_CTRL_XCVRSELECT_MASK (3 << 0) /* bits 0 and 1 */ +#define FUNC_CTRL_XCVRSELECT_HS (0 << 0) +#define FUNC_CTRL_XCVRSELECT_FS (1 << 0) +#define FUNC_CTRL_XCVRSELECT_LS (2 << 0) +#define FUNC_CTRL_XCVRSELECT_FS4LS (3 << 0) + +#define IFC_CTRL 0x07 +#define IFC_CTRL_SET 0x08 +#define IFC_CTRL_CLR 0x09 +#define IFC_CTRL_INTERFACE_PROTECT_DISABLE (1 << 7) +#define IFC_CTRL_AUTORESUME (1 << 4) +#define IFC_CTRL_CLOCKSUSPENDM (1 << 3) +#define IFC_CTRL_CARKITMODE (1 << 2) +#define IFC_CTRL_FSLSSERIALMODE_3PIN (1 << 1) + +#define TWL4030_OTG_CTRL 0x0A +#define TWL4030_OTG_CTRL_SET 0x0B +#define TWL4030_OTG_CTRL_CLR 0x0C +#define TWL4030_OTG_CTRL_DRVVBUS (1 << 5) +#define TWL4030_OTG_CTRL_CHRGVBUS (1 << 4) +#define TWL4030_OTG_CTRL_DISCHRGVBUS (1 << 3) +#define TWL4030_OTG_CTRL_DMPULLDOWN (1 << 2) +#define TWL4030_OTG_CTRL_DPPULLDOWN (1 << 1) +#define TWL4030_OTG_CTRL_IDPULLUP (1 << 0) + +#define USB_INT_EN_RISE 0x0D +#define USB_INT_EN_RISE_SET 0x0E +#define USB_INT_EN_RISE_CLR 0x0F +#define USB_INT_EN_FALL 0x10 +#define USB_INT_EN_FALL_SET 0x11 +#define USB_INT_EN_FALL_CLR 0x12 +#define USB_INT_STS 0x13 +#define USB_INT_LATCH 0x14 +#define USB_INT_IDGND (1 << 4) +#define USB_INT_SESSEND (1 << 3) +#define USB_INT_SESSVALID (1 << 2) +#define USB_INT_VBUSVALID (1 << 1) +#define USB_INT_HOSTDISCONNECT (1 << 0) + +#define CARKIT_CTRL 0x19 +#define CARKIT_CTRL_SET 0x1A +#define CARKIT_CTRL_CLR 0x1B +#define CARKIT_CTRL_MICEN (1 << 6) +#define CARKIT_CTRL_SPKRIGHTEN (1 << 5) +#define CARKIT_CTRL_SPKLEFTEN (1 << 4) +#define CARKIT_CTRL_RXDEN (1 << 3) +#define CARKIT_CTRL_TXDEN (1 << 2) +#define CARKIT_CTRL_IDGNDDRV (1 << 1) +#define CARKIT_CTRL_CARKITPWR (1 << 0) +#define CARKIT_PLS_CTRL 0x22 +#define CARKIT_PLS_CTRL_SET 0x23 +#define CARKIT_PLS_CTRL_CLR 0x24 +#define CARKIT_PLS_CTRL_SPKRRIGHT_BIASEN (1 << 3) +#define CARKIT_PLS_CTRL_SPKRLEFT_BIASEN (1 << 2) +#define CARKIT_PLS_CTRL_RXPLSEN (1 << 1) +#define CARKIT_PLS_CTRL_TXPLSEN (1 << 0) + +#define MCPC_CTRL 0x30 +#define MCPC_CTRL_SET 0x31 +#define MCPC_CTRL_CLR 0x32 +#define MCPC_CTRL_RTSOL (1 << 7) +#define MCPC_CTRL_EXTSWR (1 << 6) +#define MCPC_CTRL_EXTSWC (1 << 5) +#define MCPC_CTRL_VOICESW (1 << 4) +#define MCPC_CTRL_OUT64K (1 << 3) +#define MCPC_CTRL_RTSCTSSW (1 << 2) +#define MCPC_CTRL_HS_UART (1 << 0) + +#define MCPC_IO_CTRL 0x33 +#define MCPC_IO_CTRL_SET 0x34 +#define MCPC_IO_CTRL_CLR 0x35 +#define MCPC_IO_CTRL_MICBIASEN (1 << 5) +#define MCPC_IO_CTRL_CTS_NPU (1 << 4) +#define MCPC_IO_CTRL_RXD_PU (1 << 3) +#define MCPC_IO_CTRL_TXDTYP (1 << 2) +#define MCPC_IO_CTRL_CTSTYP (1 << 1) +#define MCPC_IO_CTRL_RTSTYP (1 << 0) + +#define MCPC_CTRL2 0x36 +#define MCPC_CTRL2_SET 0x37 +#define MCPC_CTRL2_CLR 0x38 +#define MCPC_CTRL2_MCPC_CK_EN (1 << 0) + +#define OTHER_FUNC_CTRL 0x80 +#define OTHER_FUNC_CTRL_SET 0x81 +#define OTHER_FUNC_CTRL_CLR 0x82 +#define OTHER_FUNC_CTRL_BDIS_ACON_EN (1 << 4) +#define OTHER_FUNC_CTRL_FIVEWIRE_MODE (1 << 2) + +#define OTHER_IFC_CTRL 0x83 +#define OTHER_IFC_CTRL_SET 0x84 +#define OTHER_IFC_CTRL_CLR 0x85 +#define OTHER_IFC_CTRL_OE_INT_EN (1 << 6) +#define OTHER_IFC_CTRL_CEA2011_MODE (1 << 5) +#define OTHER_IFC_CTRL_FSLSSERIALMODE_4PIN (1 << 4) +#define OTHER_IFC_CTRL_HIZ_ULPI_60MHZ_OUT (1 << 3) +#define OTHER_IFC_CTRL_HIZ_ULPI (1 << 2) +#define OTHER_IFC_CTRL_ALT_INT_REROUTE (1 << 0) + +#define OTHER_INT_EN_RISE 0x86 +#define OTHER_INT_EN_RISE_SET 0x87 +#define OTHER_INT_EN_RISE_CLR 0x88 +#define OTHER_INT_EN_FALL 0x89 +#define OTHER_INT_EN_FALL_SET 0x8A +#define OTHER_INT_EN_FALL_CLR 0x8B +#define OTHER_INT_STS 0x8C +#define OTHER_INT_LATCH 0x8D +#define OTHER_INT_VB_SESS_VLD (1 << 7) +#define OTHER_INT_DM_HI (1 << 6) /* not valid for "latch" reg */ +#define OTHER_INT_DP_HI (1 << 5) /* not valid for "latch" reg */ +#define OTHER_INT_BDIS_ACON (1 << 3) /* not valid for "fall" regs */ +#define OTHER_INT_MANU (1 << 1) +#define OTHER_INT_ABNORMAL_STRESS (1 << 0) + +#define ID_STATUS 0x96 +#define ID_RES_FLOAT (1 << 4) +#define ID_RES_440K (1 << 3) +#define ID_RES_200K (1 << 2) +#define ID_RES_102K (1 << 1) +#define ID_RES_GND (1 << 0) + +#define POWER_CTRL 0xAC +#define POWER_CTRL_SET 0xAD +#define POWER_CTRL_CLR 0xAE +#define POWER_CTRL_OTG_ENAB (1 << 5) + +#define OTHER_IFC_CTRL2 0xAF +#define OTHER_IFC_CTRL2_SET 0xB0 +#define OTHER_IFC_CTRL2_CLR 0xB1 +#define OTHER_IFC_CTRL2_ULPI_STP_LOW (1 << 4) +#define OTHER_IFC_CTRL2_ULPI_TXEN_POL (1 << 3) +#define OTHER_IFC_CTRL2_ULPI_4PIN_2430 (1 << 2) +#define OTHER_IFC_CTRL2_USB_INT_OUTSEL_MASK (3 << 0) /* bits 0 and 1 */ +#define OTHER_IFC_CTRL2_USB_INT_OUTSEL_INT1N (0 << 0) +#define OTHER_IFC_CTRL2_USB_INT_OUTSEL_INT2N (1 << 0) + +#define REG_CTRL_EN 0xB2 +#define REG_CTRL_EN_SET 0xB3 +#define REG_CTRL_EN_CLR 0xB4 +#define REG_CTRL_ERROR 0xB5 +#define ULPI_I2C_CONFLICT_INTEN (1 << 0) + +#define OTHER_FUNC_CTRL2 0xB8 +#define OTHER_FUNC_CTRL2_SET 0xB9 +#define OTHER_FUNC_CTRL2_CLR 0xBA +#define OTHER_FUNC_CTRL2_VBAT_TIMER_EN (1 << 0) + +/* following registers do not have separate _clr and _set registers */ +#define VBUS_DEBOUNCE 0xC0 +#define ID_DEBOUNCE 0xC1 +#define VBAT_TIMER 0xD3 +#define PHY_PWR_CTRL 0xFD +#define PHY_PWR_PHYPWD (1 << 0) +#define PHY_CLK_CTRL 0xFE +#define PHY_CLK_CTRL_CLOCKGATING_EN (1 << 2) +#define PHY_CLK_CTRL_CLK32K_EN (1 << 1) +#define REQ_PHY_DPLL_CLK (1 << 0) +#define PHY_CLK_CTRL_STS 0xFF +#define PHY_DPLL_CLK (1 << 0) + +/* In module TWL4030_MODULE_PM_MASTER */ +#define PROTECT_KEY 0x0E + +/* In module TWL4030_MODULE_PM_RECEIVER */ +#define VUSB_DEDICATED1 0x7D +#define VUSB_DEDICATED2 0x7E +#define VUSB1V5_DEV_GRP 0x71 +#define VUSB1V5_TYPE 0x72 +#define VUSB1V5_REMAP 0x73 +#define VUSB1V8_DEV_GRP 0x74 +#define VUSB1V8_TYPE 0x75 +#define VUSB1V8_REMAP 0x76 +#define VUSB3V1_DEV_GRP 0x77 +#define VUSB3V1_TYPE 0x78 +#define VUSB3V1_REMAP 0x79 + +/* In module TWL4030_MODULE_INTBR */ +#define PMBR1 0x0D +#define GPIO_USB_4PIN_ULPI_2430C (3 << 0) + + + +enum linkstat { + USB_LINK_UNKNOWN = 0, + USB_LINK_NONE, + USB_LINK_VBUS, + USB_LINK_ID, +}; + +struct twl4030_usb { + struct otg_transceiver otg; + struct device *dev; + + /* for vbus reporting with irqs disabled */ + spinlock_t lock; + + /* pin configuration */ + enum twl4030_usb_mode usb_mode; + + int irq; + u8 linkstat; + u8 asleep; + bool irq_enabled; +}; + +/* internal define on top of container_of */ +#define xceiv_to_twl(x) container_of((x), struct twl4030_usb, otg); + +/*-------------------------------------------------------------------------*/ + +static int twl4030_i2c_write_u8_verify(struct twl4030_usb *twl, + u8 module, u8 data, u8 address) +{ + u8 check; + + if ((twl4030_i2c_write_u8(module, data, address) >= 0) && + (twl4030_i2c_read_u8(module, &check, address) >= 0) && + (check == data)) + return 0; + dev_dbg(twl->dev, "Write%d[%d,0x%x] wrote %02x but read %02x\n", + 1, module, address, check, data); + + /* Failed once: Try again */ + if ((twl4030_i2c_write_u8(module, data, address) >= 0) && + (twl4030_i2c_read_u8(module, &check, address) >= 0) && + (check == data)) + return 0; + dev_dbg(twl->dev, "Write%d[%d,0x%x] wrote %02x but read %02x\n", + 2, module, address, check, data); + + /* Failed again: Return error */ + return -EBUSY; +} + +#define twl4030_usb_write_verify(twl, address, data) \ + twl4030_i2c_write_u8_verify(twl, TWL4030_MODULE_USB, (data), (address)) + +static inline int twl4030_usb_write(struct twl4030_usb *twl, + u8 address, u8 data) +{ + int ret = 0; + + ret = twl4030_i2c_write_u8(TWL4030_MODULE_USB, data, address); + if (ret < 0) + dev_dbg(twl->dev, + "TWL4030:USB:Write[0x%x] Error %d\n", address, ret); + return ret; +} + +static inline int twl4030_readb(struct twl4030_usb *twl, u8 module, u8 address) +{ + u8 data; + int ret = 0; + + ret = twl4030_i2c_read_u8(module, &data, address); + if (ret >= 0) + ret = data; + else + dev_dbg(twl->dev, + "TWL4030:readb[0x%x,0x%x] Error %d\n", + module, address, ret); + + return ret; +} + +static inline int twl4030_usb_read(struct twl4030_usb *twl, u8 address) +{ + return twl4030_readb(twl, TWL4030_MODULE_USB, address); +} + +/*-------------------------------------------------------------------------*/ + +static inline int +twl4030_usb_set_bits(struct twl4030_usb *twl, u8 reg, u8 bits) +{ + return twl4030_usb_write(twl, reg + 1, bits); +} + +static inline int +twl4030_usb_clear_bits(struct twl4030_usb *twl, u8 reg, u8 bits) +{ + return twl4030_usb_write(twl, reg + 2, bits); +} + +/*-------------------------------------------------------------------------*/ + +static enum linkstat twl4030_usb_linkstat(struct twl4030_usb *twl) +{ + int status; + int linkstat = USB_LINK_UNKNOWN; + + /* STS_HW_CONDITIONS */ + status = twl4030_readb(twl, TWL4030_MODULE_PM_MASTER, 0x0f); + if (status < 0) + dev_err(twl->dev, "USB link status err %d\n", status); + else if (status & BIT(7)) + linkstat = USB_LINK_VBUS; + else if (status & BIT(2)) + linkstat = USB_LINK_ID; + else + linkstat = USB_LINK_NONE; + + dev_dbg(twl->dev, "HW_CONDITIONS 0x%02x/%d; link %d\n", + status, status, linkstat); + + /* REVISIT this assumes host and peripheral controllers + * are registered, and that both are active... + */ + + spin_lock_irq(&twl->lock); + twl->linkstat = linkstat; + if (linkstat == USB_LINK_ID) { + twl->otg.default_a = true; + twl->otg.state = OTG_STATE_A_IDLE; + } else { + twl->otg.default_a = false; + twl->otg.state = OTG_STATE_B_IDLE; + } + spin_unlock_irq(&twl->lock); + + return linkstat; +} + +static void twl4030_usb_set_mode(struct twl4030_usb *twl, int mode) +{ + twl->usb_mode = mode; + + switch (mode) { + case T2_USB_MODE_ULPI: + twl4030_usb_clear_bits(twl, IFC_CTRL, IFC_CTRL_CARKITMODE); + twl4030_usb_set_bits(twl, POWER_CTRL, POWER_CTRL_OTG_ENAB); + twl4030_usb_clear_bits(twl, FUNC_CTRL, + FUNC_CTRL_XCVRSELECT_MASK | + FUNC_CTRL_OPMODE_MASK); + break; + case -1: + /* FIXME: power on defaults */ + break; + default: + dev_err(twl->dev, "unsupported T2 transceiver mode %d\n", + mode); + break; + }; +} + +static void twl4030_i2c_access(struct twl4030_usb *twl, int on) +{ + unsigned long timeout; + int val = twl4030_usb_read(twl, PHY_CLK_CTRL); + + if (val >= 0) { + if (on) { + /* enable DPLL to access PHY registers over I2C */ + val |= REQ_PHY_DPLL_CLK; + WARN_ON(twl4030_usb_write_verify(twl, PHY_CLK_CTRL, + (u8)val) < 0); + + timeout = jiffies + HZ; + while (!(twl4030_usb_read(twl, PHY_CLK_CTRL_STS) & + PHY_DPLL_CLK) + && time_before(jiffies, timeout)) + udelay(10); + if (!(twl4030_usb_read(twl, PHY_CLK_CTRL_STS) & + PHY_DPLL_CLK)) + dev_err(twl->dev, "Timeout setting T2 HSUSB " + "PHY DPLL clock\n"); + } else { + /* let ULPI control the DPLL clock */ + val &= ~REQ_PHY_DPLL_CLK; + WARN_ON(twl4030_usb_write_verify(twl, PHY_CLK_CTRL, + (u8)val) < 0); + } + } +} + +static void twl4030_phy_power(struct twl4030_usb *twl, int on) +{ + u8 pwr; + + pwr = twl4030_usb_read(twl, PHY_PWR_CTRL); + if (on) { + pwr &= ~PHY_PWR_PHYPWD; + WARN_ON(twl4030_usb_write_verify(twl, PHY_PWR_CTRL, pwr) < 0); + twl4030_usb_write(twl, PHY_CLK_CTRL, + twl4030_usb_read(twl, PHY_CLK_CTRL) | + (PHY_CLK_CTRL_CLOCKGATING_EN | + PHY_CLK_CTRL_CLK32K_EN)); + } else { + pwr |= PHY_PWR_PHYPWD; + WARN_ON(twl4030_usb_write_verify(twl, PHY_PWR_CTRL, pwr) < 0); + } +} + +static void twl4030_phy_suspend(struct twl4030_usb *twl, int controller_off) +{ + if (twl->asleep) + return; + + twl4030_phy_power(twl, 0); + twl->asleep = 1; +} + +static void twl4030_phy_resume(struct twl4030_usb *twl) +{ + if (!twl->asleep) + return; + + twl4030_phy_power(twl, 1); + twl4030_i2c_access(twl, 1); + twl4030_usb_set_mode(twl, twl->usb_mode); + if (twl->usb_mode == T2_USB_MODE_ULPI) + twl4030_i2c_access(twl, 0); + twl->asleep = 0; +} + +static void twl4030_usb_ldo_init(struct twl4030_usb *twl) +{ + /* Enable writing to power configuration registers */ + twl4030_i2c_write_u8(TWL4030_MODULE_PM_MASTER, 0xC0, PROTECT_KEY); + twl4030_i2c_write_u8(TWL4030_MODULE_PM_MASTER, 0x0C, PROTECT_KEY); + + /* put VUSB3V1 LDO in active state */ + twl4030_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0, VUSB_DEDICATED2); + + /* input to VUSB3V1 LDO is from VBAT, not VBUS */ + twl4030_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0x14, VUSB_DEDICATED1); + + /* turn on 3.1V regulator */ + twl4030_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0x20, VUSB3V1_DEV_GRP); + twl4030_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0, VUSB3V1_TYPE); + + /* turn on 1.5V regulator */ + twl4030_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0x20, VUSB1V5_DEV_GRP); + twl4030_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0, VUSB1V5_TYPE); + + /* turn on 1.8V regulator */ + twl4030_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0x20, VUSB1V8_DEV_GRP); + twl4030_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0, VUSB1V8_TYPE); + + /* disable access to power configuration registers */ + twl4030_i2c_write_u8(TWL4030_MODULE_PM_MASTER, 0, PROTECT_KEY); +} + +static ssize_t twl4030_usb_vbus_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct twl4030_usb *twl = dev_get_drvdata(dev); + unsigned long flags; + int ret = -EINVAL; + + spin_lock_irqsave(&twl->lock, flags); + ret = sprintf(buf, "%s\n", + (twl->linkstat == USB_LINK_VBUS) ? "on" : "off"); + spin_unlock_irqrestore(&twl->lock, flags); + + return ret; +} +static DEVICE_ATTR(vbus, 0444, twl4030_usb_vbus_show, NULL); + +static irqreturn_t twl4030_usb_irq(int irq, void *_twl) +{ + struct twl4030_usb *twl = _twl; + int status; + +#ifdef CONFIG_LOCKDEP + /* WORKAROUND for lockdep forcing IRQF_DISABLED on us, which + * we don't want and can't tolerate. Although it might be + * friendlier not to borrow this thread context... + */ + local_irq_enable(); +#endif + + status = twl4030_usb_linkstat(twl); + if (status != USB_LINK_UNKNOWN) { + + /* FIXME add a set_power() method so that B-devices can + * configure the charger appropriately. It's not always + * correct to consume VBUS power, and how much current to + * consume is a function of the USB configuration chosen + * by the host. + * + * REVISIT usb_gadget_vbus_connect(...) as needed, ditto + * its disconnect() sibling, when changing to/from the + * USB_LINK_VBUS state. musb_hdrc won't care until it + * starts to handle softconnect right. + */ + twl4030charger_usb_en(status == USB_LINK_VBUS); + + if (status == USB_LINK_NONE) + twl4030_phy_suspend(twl, 0); + else + twl4030_phy_resume(twl); + } + sysfs_notify(&twl->dev->kobj, NULL, "vbus"); + + return IRQ_HANDLED; +} + +static int twl4030_set_suspend(struct otg_transceiver *x, int suspend) +{ + struct twl4030_usb *twl = xceiv_to_twl(x); + + if (suspend) + twl4030_phy_suspend(twl, 1); + else + twl4030_phy_resume(twl); + + return 0; +} + +static int twl4030_set_peripheral(struct otg_transceiver *x, + struct usb_gadget *gadget) +{ + struct twl4030_usb *twl; + + if (!x) + return -ENODEV; + + twl = xceiv_to_twl(x); + twl->otg.gadget = gadget; + if (!gadget) + twl->otg.state = OTG_STATE_UNDEFINED; + + return 0; +} + +static int twl4030_set_host(struct otg_transceiver *x, struct usb_bus *host) +{ + struct twl4030_usb *twl; + + if (!x) + return -ENODEV; + + twl = xceiv_to_twl(x); + twl->otg.host = host; + if (!host) + twl->otg.state = OTG_STATE_UNDEFINED; + + return 0; +} + +static int __init twl4030_usb_probe(struct platform_device *pdev) +{ + struct twl4030_usb_data *pdata = pdev->dev.platform_data; + struct twl4030_usb *twl; + int status; + + if (!pdata) { + dev_dbg(&pdev->dev, "platform_data not available\n"); + return -EINVAL; + } + + twl = kzalloc(sizeof *twl, GFP_KERNEL); + if (!twl) + return -ENOMEM; + + twl->dev = &pdev->dev; + twl->irq = platform_get_irq(pdev, 0); + twl->otg.dev = twl->dev; + twl->otg.label = "twl4030"; + twl->otg.set_host = twl4030_set_host; + twl->otg.set_peripheral = twl4030_set_peripheral; + twl->otg.set_suspend = twl4030_set_suspend; + twl->usb_mode = pdata->usb_mode; + twl->asleep = 1; + + /* init spinlock for workqueue */ + spin_lock_init(&twl->lock); + + twl4030_usb_ldo_init(twl); + otg_set_transceiver(&twl->otg); + + platform_set_drvdata(pdev, twl); + if (device_create_file(&pdev->dev, &dev_attr_vbus)) + dev_warn(&pdev->dev, "could not create sysfs file\n"); + + /* Our job is to use irqs and status from the power module + * to keep the transceiver disabled when nothing's connected. + * + * FIXME we actually shouldn't start enabling it until the + * USB controller drivers have said they're ready, by calling + * set_host() and/or set_peripheral() ... OTG_capable boards + * need both handles, otherwise just one suffices. + */ + twl->irq_enabled = true; + status = request_irq(twl->irq, twl4030_usb_irq, + IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING, + "twl4030_usb", twl); + if (status < 0) { + dev_dbg(&pdev->dev, "can't get IRQ %d, err %d\n", + twl->irq, status); + kfree(twl); + return status; + } + + /* The IRQ handler just handles changes from the previous states + * of the ID and VBUS pins ... in probe() we must initialize that + * previous state. The easy way: fake an IRQ. + * + * REVISIT: a real IRQ might have happened already, if PREEMPT is + * enabled. Else the IRQ may not yet be configured or enabled, + * because of scheduling delays. + */ + twl4030_usb_irq(twl->irq, twl); + + dev_info(&pdev->dev, "Initialized TWL4030 USB module\n"); + return 0; +} + +static int __exit twl4030_usb_remove(struct platform_device *pdev) +{ + struct twl4030_usb *twl = platform_get_drvdata(pdev); + int val; + + free_irq(twl->irq, twl); + device_remove_file(twl->dev, &dev_attr_vbus); + + /* set transceiver mode to power on defaults */ + twl4030_usb_set_mode(twl, -1); + + /* autogate 60MHz ULPI clock, + * clear dpll clock request for i2c access, + * disable 32KHz + */ + val = twl4030_usb_read(twl, PHY_CLK_CTRL); + if (val >= 0) { + val |= PHY_CLK_CTRL_CLOCKGATING_EN; + val &= ~(PHY_CLK_CTRL_CLK32K_EN | REQ_PHY_DPLL_CLK); + twl4030_usb_write(twl, PHY_CLK_CTRL, (u8)val); + } + + /* disable complete OTG block */ + twl4030_usb_clear_bits(twl, POWER_CTRL, POWER_CTRL_OTG_ENAB); + + twl4030_phy_power(twl, 0); + + kfree(twl); + + return 0; +} + +static struct platform_driver twl4030_usb_driver = { + .probe = twl4030_usb_probe, + .remove = __exit_p(twl4030_usb_remove), + .driver = { + .name = "twl4030_usb", + .owner = THIS_MODULE, + }, +}; + +static int __init twl4030_usb_init(void) +{ + return platform_driver_register(&twl4030_usb_driver); +} +subsys_initcall(twl4030_usb_init); + +static void __exit twl4030_usb_exit(void) +{ + platform_driver_unregister(&twl4030_usb_driver); +} +module_exit(twl4030_usb_exit); + +MODULE_ALIAS("platform:twl4030_usb"); +MODULE_AUTHOR("Texas Instruments, Inc, Nokia Corporation"); +MODULE_DESCRIPTION("TWL4030 USB transceiver driver"); +MODULE_LICENSE("GPL"); -- cgit v1.2.3-59-g8ed1b