From patchwork Wed Sep 9 09:35:10 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Amelie DELAUNAY X-Patchwork-Id: 297684 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-12.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id C10FEC43461 for ; Wed, 9 Sep 2020 09:36:28 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7681B216C4 for ; Wed, 9 Sep 2020 09:36:28 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=st.com header.i=@st.com header.b="S4uiWi7z" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728631AbgIIJgY (ORCPT ); Wed, 9 Sep 2020 05:36:24 -0400 Received: from mx08-00178001.pphosted.com ([91.207.212.93]:22558 "EHLO mx07-00178001.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1729940AbgIIJfk (ORCPT ); Wed, 9 Sep 2020 05:35:40 -0400 Received: from pps.filterd (m0046660.ppops.net [127.0.0.1]) by mx07-00178001.pphosted.com (8.16.0.42/8.16.0.42) with SMTP id 0899XgOt010720; Wed, 9 Sep 2020 11:35:21 +0200 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=st.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-type; s=STMicroelectronics; bh=F+RyVrRyuVDcq2uli2XOzKzUDeHhpR/Cq/nJcI1f7p0=; b=S4uiWi7zJsapMyc6KQ5OiT5Igyw51a8XIWRi+UX7c02O0ou9hCJ8NDihBSLcVTUqJg4Q FqCTEAFjfK1dGkiJuX4wJXRzFOiidfc2qGpO6pIDNvmPkNsUnf5gWm0LtmxHnwhepI7w 9PUC2xEko1WP6auOJrRpE3GWMwgYuknQrsg5aBaQoq01/8UWUsNfZgic1gZfLQbrH91k RE9AESBHHiKa/yKIiCdYWYKg31Rpn6kUKyXPOLCoTZVpUki7oMh6LRUH7CvNpHhs7B76 SU0axSpa/LgIGKz1w9VlOAwfbAwKNYBtWLiskbaR5a4Xh/FKOnK00NK6ZuTdNju1i6N0 1w== Received: from beta.dmz-eu.st.com (beta.dmz-eu.st.com [164.129.1.35]) by mx07-00178001.pphosted.com with ESMTP id 33byt7vsfw-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 09 Sep 2020 11:35:21 +0200 Received: from euls16034.sgp.st.com (euls16034.sgp.st.com [10.75.44.20]) by beta.dmz-eu.st.com (STMicroelectronics) with ESMTP id 4139A10002A; Wed, 9 Sep 2020 11:35:21 +0200 (CEST) Received: from Webmail-eu.st.com (gpxdag3node5.st.com [10.75.127.72]) by euls16034.sgp.st.com (STMicroelectronics) with ESMTP id 284E5220AEB; Wed, 9 Sep 2020 11:35:21 +0200 (CEST) Received: from localhost (10.75.127.47) by GPXDAG3NODE5.st.com (10.75.127.72) with Microsoft SMTP Server (TLS) id 15.0.1473.3; Wed, 9 Sep 2020 11:35:20 +0200 From: Amelie Delaunay To: Minas Harutyunyan , Felipe Balbi , Greg Kroah-Hartman , Rob Herring , Maxime Coquelin , Alexandre Torgue CC: , , , , , Fabrice Gasnier , Amelie Delaunay , Martin Blumenstingl Subject: [PATCH v6 2/3] usb: dwc2: override PHY input signals with usb role switch support Date: Wed, 9 Sep 2020 11:35:10 +0200 Message-ID: <20200909093511.4728-3-amelie.delaunay@st.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200909093511.4728-1-amelie.delaunay@st.com> References: <20200909093511.4728-1-amelie.delaunay@st.com> MIME-Version: 1.0 X-Originating-IP: [10.75.127.47] X-ClientProxiedBy: SFHDAG1NODE3.st.com (10.75.127.3) To GPXDAG3NODE5.st.com (10.75.127.72) X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.235, 18.0.687 definitions=2020-09-09_03:2020-09-08,2020-09-09 signatures=0 Sender: linux-usb-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org This patch adds support for usb role switch to dwc2, by using overriding control of the PHY voltage valid and ID input signals. iddig signal (ID) can be overridden: - when setting GUSBCFG_FORCEHOSTMODE, iddig input pin is overridden with 1; - when setting GUSBCFG_FORCEDEVMODE, iddig input pin is overridden with 0. avalid/bvalid/vbusvalid signals can be overridden respectively with: - GOTGCTL_AVALOEN + GOTGCTL_AVALOVAL - GOTGCTL_BVALOEN + GOTGCTL_BVALOVAL - GOTGCTL_VBVALEN + GOTGCTL_VBVALOVAL It is possible to determine valid sessions thanks to usb role switch: - if USB_ROLE_NONE then !avalid && !bvalid && !vbusvalid - if USB_ROLE_DEVICE then !avalid && bvalid && vbusvalid - if USB_ROLE_HOST then avalid && !bvalid && vbusvalid Acked-by: Martin Blumenstingl Signed-off-by: Amelie Delaunay --- Changes in v5: - Select USB_ROLE_SWITCH if USB_DWC2, and not only if USB_DWC2_DUAL_ROLE: drd.c is built whatever DWC2 mode (DUAL, HOST, PERIPHERAL) as it is used also to detect attach/detach (so a-valid/b-valid sessions). No changes in v5. Changes in v4: - Simplify call to dwc2_force_mode in drd.c - Add error_drd label in probe error path in platform.c Changes in v3: - Fix build issue reported by kernel test robot in drd.c Changes in v2: - Fix build issue reported by kernel test robot - Move call to dwc2_force_mode outside spinlock context - Add dwc2_drd_exit call in probe error path --- drivers/usb/dwc2/Kconfig | 1 + drivers/usb/dwc2/Makefile | 2 +- drivers/usb/dwc2/core.h | 9 ++ drivers/usb/dwc2/drd.c | 180 ++++++++++++++++++++++++++++++++++++ drivers/usb/dwc2/gadget.c | 2 +- drivers/usb/dwc2/platform.c | 20 +++- 6 files changed, 210 insertions(+), 4 deletions(-) create mode 100644 drivers/usb/dwc2/drd.c diff --git a/drivers/usb/dwc2/Kconfig b/drivers/usb/dwc2/Kconfig index 16e1aa304edc..c131719367ec 100644 --- a/drivers/usb/dwc2/Kconfig +++ b/drivers/usb/dwc2/Kconfig @@ -5,6 +5,7 @@ config USB_DWC2 depends on HAS_DMA depends on USB || USB_GADGET depends on HAS_IOMEM + select USB_ROLE_SWITCH help Say Y here if your system has a Dual Role Hi-Speed USB controller based on the DesignWare HSOTG IP Core. diff --git a/drivers/usb/dwc2/Makefile b/drivers/usb/dwc2/Makefile index 440320cc20a4..2bcd6945df46 100644 --- a/drivers/usb/dwc2/Makefile +++ b/drivers/usb/dwc2/Makefile @@ -3,7 +3,7 @@ ccflags-$(CONFIG_USB_DWC2_DEBUG) += -DDEBUG ccflags-$(CONFIG_USB_DWC2_VERBOSE) += -DVERBOSE_DEBUG obj-$(CONFIG_USB_DWC2) += dwc2.o -dwc2-y := core.o core_intr.o platform.o +dwc2-y := core.o core_intr.o platform.o drd.o dwc2-y += params.o ifneq ($(filter y,$(CONFIG_USB_DWC2_HOST) $(CONFIG_USB_DWC2_DUAL_ROLE)),) diff --git a/drivers/usb/dwc2/core.h b/drivers/usb/dwc2/core.h index 9deff0400a92..7161344c6522 100644 --- a/drivers/usb/dwc2/core.h +++ b/drivers/usb/dwc2/core.h @@ -860,6 +860,7 @@ struct dwc2_hregs_backup { * - USB_DR_MODE_PERIPHERAL * - USB_DR_MODE_HOST * - USB_DR_MODE_OTG + * @role_sw: usb_role_switch handle * @hcd_enabled: Host mode sub-driver initialization indicator. * @gadget_enabled: Peripheral mode sub-driver initialization indicator. * @ll_hw_enabled: Status of low-level hardware resources. @@ -1054,6 +1055,7 @@ struct dwc2_hsotg { struct dwc2_core_params params; enum usb_otg_state op_state; enum usb_dr_mode dr_mode; + struct usb_role_switch *role_sw; unsigned int hcd_enabled:1; unsigned int gadget_enabled:1; unsigned int ll_hw_enabled:1; @@ -1376,6 +1378,11 @@ static inline int dwc2_is_device_mode(struct dwc2_hsotg *hsotg) return (dwc2_readl(hsotg, GINTSTS) & GINTSTS_CURMODE_HOST) == 0; } +int dwc2_drd_init(struct dwc2_hsotg *hsotg); +void dwc2_drd_suspend(struct dwc2_hsotg *hsotg); +void dwc2_drd_resume(struct dwc2_hsotg *hsotg); +void dwc2_drd_exit(struct dwc2_hsotg *hsotg); + /* * Dump core registers and SPRAM */ @@ -1392,6 +1399,7 @@ int dwc2_hsotg_resume(struct dwc2_hsotg *dwc2); int dwc2_gadget_init(struct dwc2_hsotg *hsotg); void dwc2_hsotg_core_init_disconnected(struct dwc2_hsotg *dwc2, bool reset); +void dwc2_hsotg_core_disconnect(struct dwc2_hsotg *hsotg); void dwc2_hsotg_core_connect(struct dwc2_hsotg *hsotg); void dwc2_hsotg_disconnect(struct dwc2_hsotg *dwc2); int dwc2_hsotg_set_test_mode(struct dwc2_hsotg *hsotg, int testmode); @@ -1417,6 +1425,7 @@ static inline int dwc2_gadget_init(struct dwc2_hsotg *hsotg) { return 0; } static inline void dwc2_hsotg_core_init_disconnected(struct dwc2_hsotg *dwc2, bool reset) {} +static inline void dwc2_hsotg_core_disconnect(struct dwc2_hsotg *hsotg) {} static inline void dwc2_hsotg_core_connect(struct dwc2_hsotg *hsotg) {} static inline void dwc2_hsotg_disconnect(struct dwc2_hsotg *dwc2) {} static inline int dwc2_hsotg_set_test_mode(struct dwc2_hsotg *hsotg, diff --git a/drivers/usb/dwc2/drd.c b/drivers/usb/dwc2/drd.c new file mode 100644 index 000000000000..2d4176f5788e --- /dev/null +++ b/drivers/usb/dwc2/drd.c @@ -0,0 +1,180 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * drd.c - DesignWare USB2 DRD Controller Dual-role support + * + * Copyright (C) 2020 STMicroelectronics + * + * Author(s): Amelie Delaunay + */ + +#include +#include +#include +#include "core.h" + +static void dwc2_ovr_init(struct dwc2_hsotg *hsotg) +{ + unsigned long flags; + u32 gotgctl; + + spin_lock_irqsave(&hsotg->lock, flags); + + gotgctl = dwc2_readl(hsotg, GOTGCTL); + gotgctl |= GOTGCTL_BVALOEN | GOTGCTL_AVALOEN | GOTGCTL_VBVALOEN; + gotgctl |= GOTGCTL_DBNCE_FLTR_BYPASS; + gotgctl &= ~(GOTGCTL_BVALOVAL | GOTGCTL_AVALOVAL | GOTGCTL_VBVALOVAL); + dwc2_writel(hsotg, gotgctl, GOTGCTL); + + dwc2_force_mode(hsotg, false); + + spin_unlock_irqrestore(&hsotg->lock, flags); +} + +static int dwc2_ovr_avalid(struct dwc2_hsotg *hsotg, bool valid) +{ + u32 gotgctl = dwc2_readl(hsotg, GOTGCTL); + + /* Check if A-Session is already in the right state */ + if ((valid && (gotgctl & GOTGCTL_ASESVLD)) || + (!valid && !(gotgctl & GOTGCTL_ASESVLD))) + return -EALREADY; + + if (valid) + gotgctl |= GOTGCTL_AVALOVAL | GOTGCTL_VBVALOVAL; + else + gotgctl &= ~(GOTGCTL_AVALOVAL | GOTGCTL_VBVALOVAL); + dwc2_writel(hsotg, gotgctl, GOTGCTL); + + return 0; +} + +static int dwc2_ovr_bvalid(struct dwc2_hsotg *hsotg, bool valid) +{ + u32 gotgctl = dwc2_readl(hsotg, GOTGCTL); + + /* Check if B-Session is already in the right state */ + if ((valid && (gotgctl & GOTGCTL_BSESVLD)) || + (!valid && !(gotgctl & GOTGCTL_BSESVLD))) + return -EALREADY; + + if (valid) + gotgctl |= GOTGCTL_BVALOVAL | GOTGCTL_VBVALOVAL; + else + gotgctl &= ~(GOTGCTL_BVALOVAL | GOTGCTL_VBVALOVAL); + dwc2_writel(hsotg, gotgctl, GOTGCTL); + + return 0; +} + +static int dwc2_drd_role_sw_set(struct usb_role_switch *sw, enum usb_role role) +{ + struct dwc2_hsotg *hsotg = usb_role_switch_get_drvdata(sw); + unsigned long flags; + int already = 0; + + /* Skip session not in line with dr_mode */ + if ((role == USB_ROLE_DEVICE && hsotg->dr_mode == USB_DR_MODE_HOST) || + (role == USB_ROLE_HOST && hsotg->dr_mode == USB_DR_MODE_PERIPHERAL)) + return -EINVAL; + +#if IS_ENABLED(CONFIG_USB_DWC2_PERIPHERAL) || \ + IS_ENABLED(CONFIG_USB_DWC2_DUAL_ROLE) + /* Skip session if core is in test mode */ + if (role == USB_ROLE_NONE && hsotg->test_mode) { + dev_dbg(hsotg->dev, "Core is in test mode\n"); + return -EBUSY; + } +#endif + + spin_lock_irqsave(&hsotg->lock, flags); + + if (role == USB_ROLE_HOST) { + already = dwc2_ovr_avalid(hsotg, true); + } else if (role == USB_ROLE_DEVICE) { + already = dwc2_ovr_bvalid(hsotg, true); + /* This clear DCTL.SFTDISCON bit */ + dwc2_hsotg_core_connect(hsotg); + } else { + if (dwc2_is_device_mode(hsotg)) { + if (!dwc2_ovr_bvalid(hsotg, false)) + /* This set DCTL.SFTDISCON bit */ + dwc2_hsotg_core_disconnect(hsotg); + } else { + dwc2_ovr_avalid(hsotg, false); + } + } + + spin_unlock_irqrestore(&hsotg->lock, flags); + + if (!already && hsotg->dr_mode == USB_DR_MODE_OTG) + /* This will raise a Connector ID Status Change Interrupt */ + dwc2_force_mode(hsotg, role == USB_ROLE_HOST); + + dev_dbg(hsotg->dev, "%s-session valid\n", + role == USB_ROLE_NONE ? "No" : + role == USB_ROLE_HOST ? "A" : "B"); + + return 0; +} + +int dwc2_drd_init(struct dwc2_hsotg *hsotg) +{ + struct usb_role_switch_desc role_sw_desc = {0}; + struct usb_role_switch *role_sw; + int ret; + + if (!device_property_read_bool(hsotg->dev, "usb-role-switch")) + return 0; + + role_sw_desc.driver_data = hsotg; + role_sw_desc.fwnode = dev_fwnode(hsotg->dev); + role_sw_desc.set = dwc2_drd_role_sw_set; + role_sw_desc.allow_userspace_control = true; + + role_sw = usb_role_switch_register(hsotg->dev, &role_sw_desc); + if (IS_ERR(role_sw)) { + ret = PTR_ERR(role_sw); + dev_err(hsotg->dev, + "failed to register role switch: %d\n", ret); + return ret; + } + + hsotg->role_sw = role_sw; + + /* Enable override and initialize values */ + dwc2_ovr_init(hsotg); + + return 0; +} + +void dwc2_drd_suspend(struct dwc2_hsotg *hsotg) +{ + u32 gintsts, gintmsk; + + if (hsotg->role_sw && !hsotg->params.external_id_pin_ctl) { + gintmsk = dwc2_readl(hsotg, GINTMSK); + gintmsk &= ~GINTSTS_CONIDSTSCHNG; + dwc2_writel(hsotg, gintmsk, GINTMSK); + gintsts = dwc2_readl(hsotg, GINTSTS); + dwc2_writel(hsotg, gintsts | GINTSTS_CONIDSTSCHNG, GINTSTS); + } +} + +void dwc2_drd_resume(struct dwc2_hsotg *hsotg) +{ + u32 gintsts, gintmsk; + + if (hsotg->role_sw && !hsotg->params.external_id_pin_ctl) { + gintsts = dwc2_readl(hsotg, GINTSTS); + dwc2_writel(hsotg, gintsts | GINTSTS_CONIDSTSCHNG, GINTSTS); + gintmsk = dwc2_readl(hsotg, GINTMSK); + gintmsk |= GINTSTS_CONIDSTSCHNG; + dwc2_writel(hsotg, gintmsk, GINTMSK); + } +} + +void dwc2_drd_exit(struct dwc2_hsotg *hsotg) +{ + if (hsotg->role_sw) + usb_role_switch_unregister(hsotg->role_sw); +} diff --git a/drivers/usb/dwc2/gadget.c b/drivers/usb/dwc2/gadget.c index 5b9d23991c99..16c5f976f141 100644 --- a/drivers/usb/dwc2/gadget.c +++ b/drivers/usb/dwc2/gadget.c @@ -3530,7 +3530,7 @@ void dwc2_hsotg_core_init_disconnected(struct dwc2_hsotg *hsotg, dwc2_readl(hsotg, DOEPCTL0)); } -static void dwc2_hsotg_core_disconnect(struct dwc2_hsotg *hsotg) +void dwc2_hsotg_core_disconnect(struct dwc2_hsotg *hsotg) { /* set the soft-disconnect bit */ dwc2_set_bit(hsotg, DCTL, DCTL_SFTDISCON); diff --git a/drivers/usb/dwc2/platform.c b/drivers/usb/dwc2/platform.c index b28e90e0b685..238004050557 100644 --- a/drivers/usb/dwc2/platform.c +++ b/drivers/usb/dwc2/platform.c @@ -314,6 +314,8 @@ static int dwc2_driver_remove(struct platform_device *dev) if (hsotg->gadget_enabled) dwc2_hsotg_remove(hsotg); + dwc2_drd_exit(hsotg); + if (hsotg->params.activate_stm_id_vb_detection) regulator_disable(hsotg->usb33d); @@ -533,10 +535,17 @@ static int dwc2_driver_probe(struct platform_device *dev) dwc2_writel(hsotg, ggpio, GGPIO); } + retval = dwc2_drd_init(hsotg); + if (retval) { + if (retval != -EPROBE_DEFER) + dev_err(hsotg->dev, "failed to initialize dual-role\n"); + goto error_init; + } + if (hsotg->dr_mode != USB_DR_MODE_HOST) { retval = dwc2_gadget_init(hsotg); if (retval) - goto error_init; + goto error_drd; hsotg->gadget_enabled = 1; } @@ -562,7 +571,7 @@ static int dwc2_driver_probe(struct platform_device *dev) if (retval) { if (hsotg->gadget_enabled) dwc2_hsotg_remove(hsotg); - goto error_init; + goto error_drd; } hsotg->hcd_enabled = 1; } @@ -594,6 +603,9 @@ static int dwc2_driver_probe(struct platform_device *dev) dwc2_debugfs_exit(hsotg); if (hsotg->hcd_enabled) dwc2_hcd_remove(hsotg); +error_drd: + dwc2_drd_exit(hsotg); + error_init: if (hsotg->params.activate_stm_id_vb_detection) regulator_disable(hsotg->usb33d); @@ -612,6 +624,8 @@ static int __maybe_unused dwc2_suspend(struct device *dev) if (is_device_mode) dwc2_hsotg_suspend(dwc2); + dwc2_drd_suspend(dwc2); + if (dwc2->params.activate_stm_id_vb_detection) { unsigned long flags; u32 ggpio, gotgctl; @@ -692,6 +706,8 @@ static int __maybe_unused dwc2_resume(struct device *dev) /* Need to restore FORCEDEVMODE/FORCEHOSTMODE */ dwc2_force_dr_mode(dwc2); + dwc2_drd_resume(dwc2); + if (dwc2_is_device_mode(dwc2)) ret = dwc2_hsotg_resume(dwc2);