From patchwork Sun May 14 05:49:11 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Krishna Kurapati X-Patchwork-Id: 681922 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id A6287C77B7D for ; Sun, 14 May 2023 05:50:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233814AbjENFuW (ORCPT ); Sun, 14 May 2023 01:50:22 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36414 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233117AbjENFuL (ORCPT ); Sun, 14 May 2023 01:50:11 -0400 Received: from mx0a-0031df01.pphosted.com (mx0a-0031df01.pphosted.com [205.220.168.131]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id EC2A030DD; Sat, 13 May 2023 22:50:03 -0700 (PDT) Received: from pps.filterd (m0279863.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 34E5nr2E016965; Sun, 14 May 2023 05:49:53 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=quicinc.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding : content-type; s=qcppdkim1; bh=haZb1z2LzFNRqnKEupO38x+3eatWMvaZY0c3q4t/pbU=; b=G0eB/OQ8XJHurH0onUkgE0C6+4It2bwRbXrz0pM6vaxtfS1A2xoZV/5iPjVbKcvdZ0QG yWy+x7Nj56YBcGe74nrzR/8EWbqaftIUbm7QXai8kX7dO0qLfzO3zTDsQ87I6apN9P7p RZ/frBBzi6//hIug0v+TyETQnxQYe+YGP3T1CtupxCV4CKuvPdqJwx5128XbY7hoAP/T C1FwjQt42tY2Q+tr6lJWQtLzJq1V01Pkz7S1tvbAe/8VXgDHbuSdnYw9acEhxnpZ9F88 Epnr1srrsm+5znRu2JeF6ihk2fz0yfyhAolaSiKJDCL8JrCVXw1xQ42CKDUTzU2HWsOf Cw== Received: from nalasppmta05.qualcomm.com (Global_NAT1.qualcomm.com [129.46.96.20]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 3qj2sb1edr-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Sun, 14 May 2023 05:49:52 +0000 Received: from nalasex01a.na.qualcomm.com (nalasex01a.na.qualcomm.com [10.47.209.196]) by NALASPPMTA05.qualcomm.com (8.17.1.5/8.17.1.5) with ESMTPS id 34E5npfM020166 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Sun, 14 May 2023 05:49:51 GMT Received: from hu-kriskura-hyd.qualcomm.com (10.80.80.8) by nalasex01a.na.qualcomm.com (10.47.209.196) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.986.42; Sat, 13 May 2023 22:49:45 -0700 From: Krishna Kurapati To: Thinh Nguyen , Greg Kroah-Hartman , Philipp Zabel , "Andy Gross" , Bjorn Andersson , "Konrad Dybcio" , Rob Herring , Krzysztof Kozlowski , Felipe Balbi CC: , , , , , , , , , , Krishna Kurapati Subject: [PATCH v8 3/9] usb: dwc3: core: Access XHCI address space temporarily to read port info Date: Sun, 14 May 2023 11:19:11 +0530 Message-ID: <20230514054917.21318-4-quic_kriskura@quicinc.com> X-Mailer: git-send-email 2.40.0 In-Reply-To: <20230514054917.21318-1-quic_kriskura@quicinc.com> References: <20230514054917.21318-1-quic_kriskura@quicinc.com> MIME-Version: 1.0 X-Originating-IP: [10.80.80.8] X-ClientProxiedBy: nasanex01a.na.qualcomm.com (10.52.223.231) To nalasex01a.na.qualcomm.com (10.47.209.196) X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-GUID: M1zuG-4TNEZxVgD6K_B80swAlQ2kBHT8 X-Proofpoint-ORIG-GUID: M1zuG-4TNEZxVgD6K_B80swAlQ2kBHT8 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.254,Aquarius:18.0.942,Hydra:6.0.573,FMLib:17.11.170.22 definitions=2023-05-14_03,2023-05-05_01,2023-02-09_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxlogscore=999 priorityscore=1501 lowpriorityscore=0 adultscore=0 malwarescore=0 spamscore=0 bulkscore=0 impostorscore=0 clxscore=1015 mlxscore=0 phishscore=0 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2304280000 definitions=main-2305140052 Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org Currently host-only capable DWC3 controllers support Multiport. Temporarily map XHCI address space for host-only controllers and parse XHCI Extended Capabilities registers to read number of usb2 ports and usb3 ports present on multiport controller. Each USB Port is at least HS capable. The port info for usb2 and usb3 phy are identified as num_usb2_ports and num_usb3_ports. The intention is as follows: Wherever we need to perform phy operations like: LOOP_OVER_NUMBER_OF_AVAILABLE_PORTS() { phy_set_mode(dwc->usb2_generic_phy[i], PHY_MODE_USB_HOST); phy_set_mode(dwc->usb3_generic_phy[i], PHY_MODE_USB_HOST); } If number of usb2 ports is 3, loop can go from index 0-2 for usb2_generic_phy. If number of usb3-ports is 2, we don't know for sure, if the first 2 ports are SS capable or some other ports like (2 and 3) are SS capable. So instead, num_usb2_ports is used to loop around all phy's (both hs and ss) for performing phy operations. If any usb3_generic_phy turns out to be NULL, phy operation just bails out. num_usb3_ports is used to modify GUSB3PIPECTL registers while setting up phy's as we need to know how many SS capable ports are there for this. Signed-off-by: Krishna Kurapati --- drivers/usb/dwc3/core.c | 113 ++++++++++++++++++++++++++++++++++++++++ drivers/usb/dwc3/core.h | 17 +++++- 2 files changed, 129 insertions(+), 1 deletion(-) diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c index 0beaab932e7d..e983aef1fb93 100644 --- a/drivers/usb/dwc3/core.c +++ b/drivers/usb/dwc3/core.c @@ -1767,6 +1767,104 @@ static int dwc3_get_clocks(struct dwc3 *dwc) return 0; } +/** + * dwc3_xhci_find_next_ext_cap - Find the offset of the extended capabilities + * with capability ID id. + * + * @base: PCI MMIO registers base address. + * @start: address at which to start looking, (0 or HCC_PARAMS to start at + * beginning of list) + * @id: Extended capability ID to search for, or 0 for the next + * capability + * + * Returns the offset of the next matching extended capability structure. + * Some capabilities can occur several times, e.g., the XHCI_EXT_CAPS_PROTOCOL, + * and this provides a way to find them all. + */ +static int dwc3_xhci_find_next_ext_cap(void __iomem *base, u32 start, int id) +{ + u32 val; + u32 next; + u32 offset; + + offset = start; + if (!start || start == XHCI_HCC_PARAMS_OFFSET) { + val = readl(base + XHCI_HCC_PARAMS_OFFSET); + if (val == ~0) + return 0; + offset = XHCI_HCC_EXT_CAPS(val) << 2; + if (!offset) + return 0; + } + do { + val = readl(base + offset); + if (val == ~0) + return 0; + if (offset != start && (id == 0 || XHCI_EXT_CAPS_ID(val) == id)) + return offset; + + next = XHCI_EXT_CAPS_NEXT(val); + offset += next << 2; + } while (next); + + return 0; +} + +static int dwc3_read_port_info(struct dwc3 *dwc) +{ + void __iomem *regs; + u32 offset; + u32 temp; + u8 major_revision; + int ret = 0; + + /* + * Remap xHCI address space to access XHCI ext cap regs, + * since it is needed to get port info. + */ + regs = ioremap(dwc->xhci_resources[0].start, + resource_size(&dwc->xhci_resources[0])); + if (IS_ERR(regs)) + return PTR_ERR(regs); + + offset = dwc3_xhci_find_next_ext_cap(regs, 0, + XHCI_EXT_CAPS_PROTOCOL); + while (offset) { + temp = readl(regs + offset); + major_revision = XHCI_EXT_PORT_MAJOR(temp); + + temp = readl(regs + offset + 0x08); + if (major_revision == 0x03) { + dwc->num_usb3_ports += XHCI_EXT_PORT_COUNT(temp); + } else if (major_revision <= 0x02) { + dwc->num_usb2_ports += XHCI_EXT_PORT_COUNT(temp); + } else { + dev_err(dwc->dev, + "Unrecognized port major revision %d\n", major_revision); + ret = -EINVAL; + goto unmap_reg; + } + + offset = dwc3_xhci_find_next_ext_cap(regs, offset, + XHCI_EXT_CAPS_PROTOCOL); + } + + temp = readl(regs + DWC3_XHCI_HCSPARAMS1); + if (HCS_MAX_PORTS(temp) != (dwc->num_usb3_ports + dwc->num_usb2_ports)) { + dev_err(dwc->dev, + "Mismatched reported MAXPORTS (%d)\n", HCS_MAX_PORTS(temp)); + ret = -EINVAL; + goto unmap_reg; + } + + dev_dbg(dwc->dev, + "hs-ports: %d ss-ports: %d\n", dwc->num_usb2_ports, dwc->num_usb3_ports); + +unmap_reg: + iounmap(regs); + return ret; +} + static int dwc3_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; @@ -1774,6 +1872,7 @@ static int dwc3_probe(struct platform_device *pdev) void __iomem *regs; struct dwc3 *dwc; int ret; + unsigned int hw_mode; dwc = devm_kzalloc(dev, sizeof(*dwc), GFP_KERNEL); if (!dwc) @@ -1843,6 +1942,20 @@ static int dwc3_probe(struct platform_device *pdev) goto err_disable_clks; } + /* + * Currently DWC3 controllers that are host-only capable + * support Multiport + */ + hw_mode = DWC3_GHWPARAMS0_MODE(dwc->hwparams.hwparams0); + if (hw_mode == DWC3_GHWPARAMS0_MODE_HOST) { + ret = dwc3_read_port_info(dwc); + if (ret) + goto err_disable_clks; + } else { + dwc->num_usb2_ports = 1; + dwc->num_usb3_ports = 1; + } + spin_lock_init(&dwc->lock); mutex_init(&dwc->mutex); diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h index d56457c02996..d3401963bc27 100644 --- a/drivers/usb/dwc3/core.h +++ b/drivers/usb/dwc3/core.h @@ -35,6 +35,17 @@ #define DWC3_MSG_MAX 500 +/* Define XHCI Extcap register offsets for getting multiport info */ +#define XHCI_HCC_PARAMS_OFFSET 0x10 +#define DWC3_XHCI_HCSPARAMS1 0x04 +#define XHCI_EXT_CAPS_PROTOCOL 2 +#define XHCI_HCC_EXT_CAPS(x) (((x) >> 16) & 0xffff) +#define XHCI_EXT_CAPS_ID(x) (((x) >> 0) & 0xff) +#define XHCI_EXT_CAPS_NEXT(x) (((x) >> 8) & 0xff) +#define XHCI_EXT_PORT_MAJOR(x) (((x) >> 24) & 0xff) +#define XHCI_EXT_PORT_COUNT(x) (((x) >> 8) & 0xff) +#define HCS_MAX_PORTS(x) (((x) >> 24) & 0x7f) + /* Global constants */ #define DWC3_PULL_UP_TIMEOUT 500 /* ms */ #define DWC3_BOUNCE_SIZE 1024 /* size of a superspeed bulk */ @@ -1025,6 +1036,8 @@ struct dwc3_scratchpad_array { * @usb_psy: pointer to power supply interface. * @usb2_phy: pointer to USB2 PHY * @usb3_phy: pointer to USB3 PHY + * @num_usb2_ports: number of usb2 ports. + * @num_usb3_ports: number of usb3 ports. * @usb2_generic_phy: pointer to USB2 PHY * @usb3_generic_phy: pointer to USB3 PHY * @phys_ready: flag to indicate that PHYs are ready @@ -1162,6 +1175,9 @@ struct dwc3 { struct usb_phy *usb2_phy; struct usb_phy *usb3_phy; + u8 num_usb2_ports; + u8 num_usb3_ports; + struct phy *usb2_generic_phy; struct phy *usb3_generic_phy; @@ -1649,5 +1665,4 @@ static inline int dwc3_ulpi_init(struct dwc3 *dwc) static inline void dwc3_ulpi_exit(struct dwc3 *dwc) { } #endif - #endif /* __DRIVERS_USB_DWC3_CORE_H */