From patchwork Tue Feb 21 14:39:40 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mukesh Ojha X-Patchwork-Id: 13148010 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 B6D45C636D7 for ; Tue, 21 Feb 2023 14:40:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234572AbjBUOkQ (ORCPT ); Tue, 21 Feb 2023 09:40:16 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60614 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234550AbjBUOkJ (ORCPT ); Tue, 21 Feb 2023 09:40:09 -0500 Received: from mx0b-0031df01.pphosted.com (mx0b-0031df01.pphosted.com [205.220.180.131]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 18C3628D1E; Tue, 21 Feb 2023 06:40:08 -0800 (PST) Received: from pps.filterd (m0279872.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 31LDZRmB001877; Tue, 21 Feb 2023 14:40:04 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-type; s=qcppdkim1; bh=IwZRW6l6jcYWknvtnXsL53z2sTmEbJH1YXShJA0h5bs=; b=c7Ctk13AI+M4m6CO6tiPMDBaAuo/sq/5uEAFU5IMoM9NggLsvSaakBI4uaEV0ICpgRt2 9VKUhCpDwbdAkv0ZigFe6W9u95ECFKu5F6xGbhuUH9QMmVWeLEGYTlqhacyLQ/VEIE8h SaTTP5SXgv61xOfIsgRp2SC7kHqrJ70eFd8DhrJvWblmbX1ZaysAJYza3Z9FnuHPQdsk Pw0UWUoT9B6G4+uaYdN6PkNcUV6bpmJV/opBoAKGeTjzrCZ0JkBPgjpl2UI8JoZXw2Si aOhMO02ht6A43xhsWJca8bm0Cz4UKO0Oll6edvgRT4+leQifHG/1XCQVxAUluj0RcVA/ XQ== Received: from nasanppmta04.qualcomm.com (i-global254.qualcomm.com [199.106.103.254]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 3nvn8r9fh2-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 21 Feb 2023 14:40:04 +0000 Received: from nasanex01c.na.qualcomm.com (nasanex01c.na.qualcomm.com [10.45.79.139]) by NASANPPMTA04.qualcomm.com (8.17.1.5/8.17.1.5) with ESMTPS id 31LEe31L009009 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 21 Feb 2023 14:40:03 GMT Received: from hu-mojha-hyd.qualcomm.com (10.80.80.8) by nasanex01c.na.qualcomm.com (10.45.79.139) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.986.41; Tue, 21 Feb 2023 06:40:01 -0800 From: Mukesh Ojha To: , , CC: , , "Mukesh Ojha" Subject: [PATCH 3/4] firmware: qcom_scm: Refactor code to support multiple download mode Date: Tue, 21 Feb 2023 20:09:40 +0530 Message-ID: <1676990381-18184-4-git-send-email-quic_mojha@quicinc.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1676990381-18184-1-git-send-email-quic_mojha@quicinc.com> References: <1676990381-18184-1-git-send-email-quic_mojha@quicinc.com> MIME-Version: 1.0 X-Originating-IP: [10.80.80.8] X-ClientProxiedBy: nasanex01b.na.qualcomm.com (10.46.141.250) To nasanex01c.na.qualcomm.com (10.45.79.139) X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-GUID: Q2MuaXBZa5fxC0UqRbflHwrWp1IRLlId X-Proofpoint-ORIG-GUID: Q2MuaXBZa5fxC0UqRbflHwrWp1IRLlId X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.219,Aquarius:18.0.930,Hydra:6.0.562,FMLib:17.11.170.22 definitions=2023-02-21_08,2023-02-20_02,2023-02-09_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 phishscore=0 mlxlogscore=999 bulkscore=0 adultscore=0 mlxscore=0 clxscore=1015 impostorscore=0 spamscore=0 priorityscore=1501 lowpriorityscore=0 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2212070000 definitions=main-2302210122 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org Currently on Qualcomm SoC, download_mode is enabled if CONFIG_QCOM_SCM_DOWNLOAD_MODE_DEFAULT is selected. Refactor the code such that it supports multiple download modes and drop the config. Signed-off-by: Mukesh Ojha --- drivers/firmware/Kconfig | 11 ----------- drivers/firmware/qcom_scm.c | 45 +++++++++++++++++++++++++++++++++++++++------ include/linux/qcom_scm.h | 4 ++++ 3 files changed, 43 insertions(+), 17 deletions(-) diff --git a/drivers/firmware/Kconfig b/drivers/firmware/Kconfig index b59e304..ff7e9f3 100644 --- a/drivers/firmware/Kconfig +++ b/drivers/firmware/Kconfig @@ -215,17 +215,6 @@ config MTK_ADSP_IPC config QCOM_SCM tristate -config QCOM_SCM_DOWNLOAD_MODE_DEFAULT - bool "Qualcomm download mode enabled by default" - depends on QCOM_SCM - help - A device with "download mode" enabled will upon an unexpected - warm-restart enter a special debug mode that allows the user to - "download" memory content over USB for offline postmortem analysis. - The feature can be enabled/disabled on the kernel command line. - - Say Y here to enable "download mode" by default. - config SYSFB bool select BOOT_VESA_SUPPORT diff --git a/drivers/firmware/qcom_scm.c b/drivers/firmware/qcom_scm.c index c376ba8..4975d3c 100644 --- a/drivers/firmware/qcom_scm.c +++ b/drivers/firmware/qcom_scm.c @@ -20,8 +20,43 @@ #include "qcom_scm.h" -static bool download_mode = IS_ENABLED(CONFIG_QCOM_SCM_DOWNLOAD_MODE_DEFAULT); -module_param(download_mode, bool, 0); +static unsigned int download_mode; +static struct qcom_scm *__scm; +static void qcom_scm_set_download_mode(bool enable); +static int set_dload_mode(const char *val, const struct kernel_param *kp) +{ + int ret; + int old_mode = download_mode; + + ret = param_set_int(val, kp); + if (ret) + return ret; + + switch (download_mode) { + case QCOM_DOWNLOAD_FULLDUMP: + if (__scm) + qcom_scm_set_download_mode(true); + break; + case QCOM_DOWNLOAD_NODUMP: + if (__scm) + qcom_scm_set_download_mode(false); + break; + default: + pr_err("unknown download mode\n"); + download_mode = old_mode; + return -EINVAL; + } + + return 0; +} + +static const struct kernel_param_ops dload_mode_param_ops = { + .set = set_dload_mode, + .get = param_get_hexint, +}; +module_param_cb(download_mode, &dload_mode_param_ops, &download_mode, 0644); +MODULE_PARM_DESC(download_mode, + "Download mode: 0x0=no dump mode (default), 0x10=full dump mode"); #define SCM_HAS_CORE_CLK BIT(0) #define SCM_HAS_IFACE_CLK BIT(1) @@ -70,8 +105,6 @@ static const char * const qcom_scm_convention_names[] = { [SMC_CONVENTION_LEGACY] = "smc legacy", }; -static struct qcom_scm *__scm; - static int qcom_scm_clk_enable(void) { int ret; @@ -435,8 +468,8 @@ static void qcom_scm_set_download_mode(bool enable) } ret = qcom_scm_io_writel(__scm->dload_mode_addr, enable ? - dload_addr_val | QCOM_SCM_BOOT_SET_DLOAD_MODE : - dload_addr_val & ~(QCOM_SCM_BOOT_SET_DLOAD_MODE)); + ((dload_addr_val & ~QCOM_DOWNLOAD_MODE_MASK) | download_mode) : + dload_addr_val & ~QCOM_DOWNLOAD_MODE_MASK); } else { dev_err(__scm->dev, "No available mechanism for setting download mode\n"); diff --git a/include/linux/qcom_scm.h b/include/linux/qcom_scm.h index f833564..dd6aced 100644 --- a/include/linux/qcom_scm.h +++ b/include/linux/qcom_scm.h @@ -14,6 +14,10 @@ #define QCOM_SCM_CPU_PWR_DOWN_L2_OFF 0x1 #define QCOM_SCM_HDCP_MAX_REQ_CNT 5 +#define QCOM_DOWNLOAD_MODE_MASK 0x30 +#define QCOM_DOWNLOAD_NODUMP 0x0 +#define QCOM_DOWNLOAD_FULLDUMP 0x10 + struct qcom_scm_hdcp_req { u32 addr; u32 val;