From mboxrd@z Thu Jan 1 00:00:00 1970 From: Aaro Koskinen Subject: [PATCH v3 3/4] USB: OMAP1: OTG controller driver Date: Tue, 18 Jun 2013 20:07:00 +0300 Message-ID: <1371575221-360-4-git-send-email-aaro.koskinen@iki.fi> References: <1371575221-360-1-git-send-email-aaro.koskinen@iki.fi> Return-path: In-Reply-To: <1371575221-360-1-git-send-email-aaro.koskinen-X3B1VOXEql0@public.gmane.org> Sender: linux-usb-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Felipe Balbi , linux-usb-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-omap-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org Cc: Aaro Koskinen List-Id: linux-omap@vger.kernel.org Transceivers need to manage OTG controller state on OMAP1 to enable switching between peripheral and host modes. Provide a driver for that. Signed-off-by: Aaro Koskinen --- drivers/usb/phy/Kconfig | 10 +++ drivers/usb/phy/Makefile | 1 + drivers/usb/phy/phy-omap-otg.c | 169 +++++++++++++++++++++++++++++++++++++++++ 3 files changed, 180 insertions(+) create mode 100644 drivers/usb/phy/phy-omap-otg.c diff --git a/drivers/usb/phy/Kconfig b/drivers/usb/phy/Kconfig index 7ef3eb8..14a50bd 100644 --- a/drivers/usb/phy/Kconfig +++ b/drivers/usb/phy/Kconfig @@ -135,6 +135,16 @@ 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 diff --git a/drivers/usb/phy/Makefile b/drivers/usb/phy/Makefile index a9169cb..c7f391b 100644 --- a/drivers/usb/phy/Makefile +++ b/drivers/usb/phy/Makefile @@ -15,6 +15,7 @@ obj-$(CONFIG_ISP1301_OMAP) += phy-isp1301-omap.o obj-$(CONFIG_MV_U3D_PHY) += phy-mv-u3d-usb.o obj-$(CONFIG_NOP_USB_XCEIV) += phy-nop.o obj-$(CONFIG_OMAP_CONTROL_USB) += phy-omap-control.o +obj-$(CONFIG_OMAP_OTG) += phy-omap-otg.o obj-$(CONFIG_OMAP_USB2) += phy-omap-usb2.o obj-$(CONFIG_OMAP_USB3) += phy-omap-usb3.o obj-$(CONFIG_SAMSUNG_USBPHY) += phy-samsung-usb.o diff --git a/drivers/usb/phy/phy-omap-otg.c b/drivers/usb/phy/phy-omap-otg.c new file mode 100644 index 0000000..11598cd --- /dev/null +++ b/drivers/usb/phy/phy-omap-otg.c @@ -0,0 +1,169 @@ +/* + * 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 +#include +#include +#include +#include +#include +#include +#include + +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 "); -- 1.8.3.1 -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html