Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755629AbbLANcv (ORCPT ); Tue, 1 Dec 2015 08:32:51 -0500 Received: from mga14.intel.com ([192.55.52.115]:50284 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755109AbbLANct (ORCPT ); Tue, 1 Dec 2015 08:32:49 -0500 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.20,369,1444719600"; d="scan'208";a="851409473" From: Heikki Krogerus To: Chanwoo Choi , Greg Kroah-Hartman Cc: MyungJoo Ham , David Cohen , Lu Baolu , Mathias Nyman , linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 1/2] extcon: add driver for Intel USB mux Date: Tue, 1 Dec 2015 15:32:37 +0200 Message-Id: <1448976758-35807-2-git-send-email-heikki.krogerus@linux.intel.com> X-Mailer: git-send-email 2.6.2 In-Reply-To: <1448976758-35807-1-git-send-email-heikki.krogerus@linux.intel.com> References: <1448976758-35807-1-git-send-email-heikki.krogerus@linux.intel.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 5907 Lines: 201 Several Intel PCHs and SOCs have an internal mux that is used to share one USB port between USB Device Controller and xHCI. The mux is normally handled by System FW/BIOS, but not always. For those platforms where the FW does not take care of the mux, this driver is needed. Signed-off-by: Heikki Krogerus --- drivers/extcon/Kconfig | 5 ++ drivers/extcon/Makefile | 1 + drivers/extcon/extcon-intel-usb.c | 112 +++++++++++++++++++++++++++++++++++ include/linux/extcon/intel_usb_mux.h | 31 ++++++++++ 4 files changed, 149 insertions(+) create mode 100644 drivers/extcon/extcon-intel-usb.c create mode 100644 include/linux/extcon/intel_usb_mux.h diff --git a/drivers/extcon/Kconfig b/drivers/extcon/Kconfig index 0cebbf6..0a7ccb1 100644 --- a/drivers/extcon/Kconfig +++ b/drivers/extcon/Kconfig @@ -118,3 +118,8 @@ config EXTCON_USB_GPIO Used typically if GPIO is used for USB ID pin detection. endif + +config EXTCON_INTEL_USB + bool + depends on X86 && USB + select EXTCON diff --git a/drivers/extcon/Makefile b/drivers/extcon/Makefile index ba787d0..e6e031a 100644 --- a/drivers/extcon/Makefile +++ b/drivers/extcon/Makefile @@ -15,3 +15,4 @@ obj-$(CONFIG_EXTCON_PALMAS) += extcon-palmas.o obj-$(CONFIG_EXTCON_RT8973A) += extcon-rt8973a.o obj-$(CONFIG_EXTCON_SM5502) += extcon-sm5502.o obj-$(CONFIG_EXTCON_USB_GPIO) += extcon-usb-gpio.o +obj-$(CONFIG_EXTCON_INTEL_USB) += extcon-intel-usb.o diff --git a/drivers/extcon/extcon-intel-usb.c b/drivers/extcon/extcon-intel-usb.c new file mode 100644 index 0000000..5534781 --- /dev/null +++ b/drivers/extcon/extcon-intel-usb.c @@ -0,0 +1,112 @@ +/** + * extcon-intel-usb.c - Driver for Intel USB mux + * + * Copyright (C) 2015 Intel Corporation + * Author: Heikki Krogerus + * + * 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 + +#define INTEL_MUX_CFG0 0x00 +#define INTEL_MUX_CFG1 0x04 + +#define CFG0_SW_DRD_MODE_MASK 0x3 +#define CFG0_SW_DRD_DYN 0 +#define CFG0_SW_DRD_STATIC_HOST 1 +#define CFG0_SW_DRD_STATIC_DEV 2 +#define CFG0_SW_SYNC_SS_AND_HS BIT(2) +#define CFG0_SW_SWITCH_EN BIT(16) +#define CFG0_SW_IDPIN BIT(20) +#define CFG0_SW_IDPIN_EN BIT(21) +#define CFG0_SW_VBUS_VALID BIT(24) + +#define CFG1_MODE BIT(29) + +struct intel_usb_mux { + struct notifier_block nb; + struct extcon_dev edev; + void __iomem *regs; + u32 cfg0_ctx; +}; + +static const int intel_mux_cable[] = { + EXTCON_USB_HOST, + EXTCON_NONE, +}; + +static int intel_usb_mux_notifier(struct notifier_block *nb, + unsigned long old, void *ptr) +{ + struct intel_usb_mux *mux = container_of(nb, struct intel_usb_mux, nb); + u32 val; + + if (mux->edev.state) + val = CFG0_SW_IDPIN_EN | CFG0_SW_DRD_STATIC_HOST; + else + val = CFG0_SW_IDPIN_EN | CFG0_SW_IDPIN | CFG0_SW_VBUS_VALID | + CFG0_SW_DRD_STATIC_DEV; + + writel(val, mux->regs); + return NOTIFY_OK; +} + +struct intel_usb_mux *intel_usb_mux_register(struct device *dev, + struct resource *r) +{ + struct intel_usb_mux *mux; + int ret; + + mux = kzalloc(sizeof(*mux), GFP_KERNEL); + if (!mux) + return ERR_PTR(-ENOMEM); + + mux->regs = ioremap_nocache(r->start, resource_size(r)); + if (!mux->regs) { + kfree(mux); + return ERR_PTR(-ENOMEM); + } + + mux->cfg0_ctx = readl(mux->regs + INTEL_MUX_CFG0); + + mux->edev.dev.parent = dev; + mux->edev.supported_cable = intel_mux_cable; + + ret = extcon_dev_register(&mux->edev); + if (ret) + goto err; + + mux->edev.name = "intel_usb_mux"; + mux->edev.state = !!(readl(mux->regs + INTEL_MUX_CFG1) & CFG1_MODE); + + /* An external source needs to tell us what to do */ + mux->nb.notifier_call = intel_usb_mux_notifier; + ret = extcon_register_notifier(&mux->edev, EXTCON_USB_HOST, &mux->nb); + if (ret) { + dev_err(&mux->edev.dev, "failed to register notifier\n"); + extcon_dev_unregister(&mux->edev); + goto err; + } + return mux; +err: + iounmap(mux->regs); + kfree(mux); + return ERR_PTR(ret); +} +EXPORT_SYMBOL_GPL(intel_usb_mux_register); + +void intel_usb_mux_unregister(struct intel_usb_mux *mux) +{ + extcon_unregister_notifier(&mux->edev, EXTCON_USB_HOST, &mux->nb); + extcon_dev_unregister(&mux->edev); + writel(mux->cfg0_ctx, mux->regs + INTEL_MUX_CFG0); + iounmap(mux->regs); + kfree(mux); +} +EXPORT_SYMBOL_GPL(intel_usb_mux_unregister); diff --git a/include/linux/extcon/intel_usb_mux.h b/include/linux/extcon/intel_usb_mux.h new file mode 100644 index 0000000..f18ce52 --- /dev/null +++ b/include/linux/extcon/intel_usb_mux.h @@ -0,0 +1,31 @@ +/* + * Driver for Intel USB mux + * + * Copyright (C) 2015 Intel Corporation + * + * 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. + */ + +#ifndef _INTEL_USB_MUX_H +#define _INTEL_USB_MUX_H + +#include + +struct intel_usb_mux; + +#ifdef CONFIG_EXTCON_INTEL_USB +struct intel_usb_mux *intel_usb_mux_register(struct device *dev, + struct resource *r); +void intel_usb_mux_unregister(struct intel_usb_mux *mux); +#else +static inline struct intel_usb_mux *intel_usb_mux_register(struct device *dev, + struct resource *r) +{ + return ERR_PTR(-ENOTSUPP); +} +static inline void intel_usb_mux_unregister(struct intel_usb_mux *mux) { } +#endif /* CONFIG_EXTCON_INTEL_USB */ + +#endif /* _INTEL_USB_MUX_H */ -- 2.6.2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/