usb: omap1: OTG controller driver (449d2ba6) · Commits · e / devices / android_kernel_fairphone_FP4

drivers/usb/phy/Kconfig

+10 −0

Original line number	Diff line number	Diff line
		@@ -142,6 +142,16 @@ config USB_GPIO_VBUS
		optionally control of a D+ pullup GPIO as well as a VBUS
		current limit regulator.

		config OMAP_OTG
		tristate "OMAP USB OTG controller driver"
		depends on ARCH_OMAP_OTG && EXTCON
		help
		Enable this to support some transceivers on OMAP1 platforms. OTG
		controller is needed to switch between host and peripheral modes.

		This driver can also be built as a module. If so, the module
		will be called omap-otg.

		config USB_ISP1301
		tristate "NXP ISP1301 USB transceiver support"
		depends on USB \|\| USB_GADGET

drivers/usb/phy/Makefile

+1 −0

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		@@ -15,6 +15,7 @@ obj-$(CONFIG_NOP_USB_XCEIV) += phy-generic.o
		obj-$(CONFIG_OMAP_CONTROL_USB) += phy-omap-control.o
		obj-$(CONFIG_AM335X_CONTROL_USB) += phy-am335x-control.o
		obj-$(CONFIG_AM335X_PHY_USB) += phy-am335x.o
		obj-$(CONFIG_OMAP_OTG) += phy-omap-otg.o
		obj-$(CONFIG_OMAP_USB3) += phy-omap-usb3.o
		obj-$(CONFIG_SAMSUNG_USBPHY) += phy-samsung-usb.o
		obj-$(CONFIG_SAMSUNG_USB2PHY) += phy-samsung-usb2.o

drivers/usb/phy/phy-omap-otg.c

0 → 100644

+169 −0

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		/*
		* OMAP OTG controller driver
		*
		* Based on code from tahvo-usb.c and isp1301_omap.c drivers.
		*
		* Copyright (C) 2005-2006 Nokia Corporation
		* Copyright (C) 2004 Texas Instruments
		* Copyright (C) 2004 David Brownell
		*
		* This file is subject to the terms and conditions of the GNU General
		* Public License. See the file "COPYING" in the main directory of this
		* archive for more details.
		*
		* 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/io.h>
		#include <linux/err.h>
		#include <linux/extcon.h>
		#include <linux/kernel.h>
		#include <linux/module.h>
		#include <linux/interrupt.h>
		#include <linux/platform_device.h>
		#include <linux/platform_data/usb-omap1.h>

		struct otg_device {
		void __iomem *base;
		bool id;
		bool vbus;
		struct extcon_specific_cable_nb vbus_dev;
		struct extcon_specific_cable_nb id_dev;
		struct notifier_block vbus_nb;
		struct notifier_block id_nb;
		};

		#define OMAP_OTG_CTRL 0x0c
		#define OMAP_OTG_ASESSVLD (1 << 20)
		#define OMAP_OTG_BSESSEND (1 << 19)
		#define OMAP_OTG_BSESSVLD (1 << 18)
		#define OMAP_OTG_VBUSVLD (1 << 17)
		#define OMAP_OTG_ID (1 << 16)
		#define OMAP_OTG_XCEIV_OUTPUTS \
		(OMAP_OTG_ASESSVLD \| OMAP_OTG_BSESSEND \| OMAP_OTG_BSESSVLD \| \
		OMAP_OTG_VBUSVLD \| OMAP_OTG_ID)

		static void omap_otg_ctrl(struct otg_device *otg_dev, u32 outputs)
		{
		u32 l;

		l = readl(otg_dev->base + OMAP_OTG_CTRL);
		l &= ~OMAP_OTG_XCEIV_OUTPUTS;
		l \|= outputs;
		writel(l, otg_dev->base + OMAP_OTG_CTRL);
		}

		static void omap_otg_set_mode(struct otg_device *otg_dev)
		{
		if (!otg_dev->id && otg_dev->vbus)
		/* Set B-session valid. */
		omap_otg_ctrl(otg_dev, OMAP_OTG_ID \| OMAP_OTG_BSESSVLD);
		else if (otg_dev->vbus)
		/* Set A-session valid. */
		omap_otg_ctrl(otg_dev, OMAP_OTG_ASESSVLD);
		else if (!otg_dev->id)
		/* Set B-session end to indicate no VBUS. */
		omap_otg_ctrl(otg_dev, OMAP_OTG_ID \| OMAP_OTG_BSESSEND);
		}

		static int omap_otg_id_notifier(struct notifier_block *nb,
		unsigned long event, void *ptr)
		{
		struct otg_device *otg_dev = container_of(nb, struct otg_device, id_nb);

		otg_dev->id = event;
		omap_otg_set_mode(otg_dev);

		return NOTIFY_DONE;
		}

		static int omap_otg_vbus_notifier(struct notifier_block *nb,
		unsigned long event, void *ptr)
		{
		struct otg_device *otg_dev = container_of(nb, struct otg_device,
		vbus_nb);

		otg_dev->vbus = event;
		omap_otg_set_mode(otg_dev);

		return NOTIFY_DONE;
		}

		static int omap_otg_probe(struct platform_device *pdev)
		{
		const struct omap_usb_config *config = pdev->dev.platform_data;
		struct otg_device *otg_dev;
		struct extcon_dev *extcon;
		int ret;
		u32 rev;

		if (!config \|\| !config->extcon)
		return -ENODEV;

		extcon = extcon_get_extcon_dev(config->extcon);
		if (!extcon)
		return -EPROBE_DEFER;

		otg_dev = devm_kzalloc(&pdev->dev, sizeof(*otg_dev), GFP_KERNEL);
		if (!otg_dev)
		return -ENOMEM;

		otg_dev->base = devm_ioremap_resource(&pdev->dev, &pdev->resource[0]);
		if (IS_ERR(otg_dev->base))
		return PTR_ERR(otg_dev->base);

		otg_dev->id_nb.notifier_call = omap_otg_id_notifier;
		otg_dev->vbus_nb.notifier_call = omap_otg_vbus_notifier;

		ret = extcon_register_interest(&otg_dev->id_dev, config->extcon,
		"USB-HOST", &otg_dev->id_nb);
		if (ret)
		return ret;

		ret = extcon_register_interest(&otg_dev->vbus_dev, config->extcon,
		"USB", &otg_dev->vbus_nb);
		if (ret) {
		extcon_unregister_interest(&otg_dev->id_dev);
		return ret;
		}

		otg_dev->id = extcon_get_cable_state(extcon, "USB-HOST");
		otg_dev->vbus = extcon_get_cable_state(extcon, "USB");
		omap_otg_set_mode(otg_dev);

		rev = readl(otg_dev->base);

		dev_info(&pdev->dev,
		"OMAP USB OTG controller rev %d.%d (%s, id=%d, vbus=%d)\n",
		(rev >> 4) & 0xf, rev & 0xf, config->extcon, otg_dev->id,
		otg_dev->vbus);

		return 0;
		}

		static int omap_otg_remove(struct platform_device *pdev)
		{
		struct otg_device *otg_dev = platform_get_drvdata(pdev);

		extcon_unregister_interest(&otg_dev->id_dev);
		extcon_unregister_interest(&otg_dev->vbus_dev);

		return 0;
		}

		static struct platform_driver omap_otg_driver = {
		.probe = omap_otg_probe,
		.remove = omap_otg_remove,
		.driver = {
		.owner = THIS_MODULE,
		.name = "omap_otg",
		},
		};
		module_platform_driver(omap_otg_driver);

		MODULE_DESCRIPTION("OMAP USB OTG controller driver");
		MODULE_LICENSE("GPL");
		MODULE_AUTHOR("Aaro Koskinen <aaro.koskinen@iki.fi>");