From patchwork Tue Jan 3 14:05:21 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Patrick Delaunay X-Patchwork-Id: 13087708 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 2FF17C46467 for ; Tue, 3 Jan 2023 16:57:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Date:Subject:CC:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=LCiNvNsne8N+4JWfsQsF66lQrvl2ktMKYe307zNRofM=; b=tSENAkOg8xpT9M ezICU7hQG3IJYrStE6qoSbdH4aAA8F6SRfytGwyU0OpsmVmrDEJoU2A/It1/A2MFy9QQHnommhfoM x053hzGN7Oyvq90K3Bb5eAEt9sICvkl2MCkO4L/QpNfU0u70FDzslBzwCMejKHIZMTMxBN2DNFPeK MuG4D+PRx4qtURzzPIGyw7kL4NLVuMCwI27rtAWovA5feJdcsja0eNJQv70u4h8TXHqIvKu8qpJbJ q+QBNX4pxDoxyXQapzlP9z+vX5znCBqK6Yq/VzKDc4g6S+OZvw5w8ZlMpy/kDKpn2TldeinsJ1ho6 /bGf7oftAfn05iwQ0Wzg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1pCkZU-0038qG-0U; Tue, 03 Jan 2023 16:55:29 +0000 Received: from mx08-00178001.pphosted.com ([91.207.212.93] helo=mx07-00178001.pphosted.com) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1pChxh-001oUt-L1 for linux-arm-kernel@lists.infradead.org; Tue, 03 Jan 2023 14:08:20 +0000 Received: from pps.filterd (m0046661.ppops.net [127.0.0.1]) by mx07-00178001.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 303B19nq016088; Tue, 3 Jan 2023 15:08:08 +0100 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=foss.st.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding : content-type; s=selector1; bh=BakpOF/DNu8pvX2DxGhT1ID4m18yweosmq9XQbEVqS0=; b=HjMVrG8sVXnvxnPTSyVWtyDRj9Zn5Tn2bQ1ZMZWeUeDXyuIpF731nAb+ul9qCNrGr8/0 IHCWL69WiAYb4Ay6cM0CsPSctNW+jlkgVD5f+RTepZ62nLi3aOfu4I3zlAoqxZ493YfD gDIIV8coxfe+baa1hu92joZpWYbC1qkwx8nCQwPRh9hClnxZcDG3aVwnlKIYl1W/OD2q sLUXFXyj1tiaws3odU2HB+Dq7ulDf5r02SNqXa2rxyzygpoB8buWBzeCuvBJUjIqduuF eBes9Q0a3rP6L+jYxRSklZ+wpCj0HZecniY0G9YSwm2VzX5Lrm6q08fUyT8qdAdcGMD+ qA== Received: from beta.dmz-eu.st.com (beta.dmz-eu.st.com [164.129.1.35]) by mx07-00178001.pphosted.com (PPS) with ESMTPS id 3mtcupnht6-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 03 Jan 2023 15:08:08 +0100 Received: from euls16034.sgp.st.com (euls16034.sgp.st.com [10.75.44.20]) by beta.dmz-eu.st.com (STMicroelectronics) with ESMTP id E1F5010002A; Tue, 3 Jan 2023 15:08:07 +0100 (CET) Received: from Webmail-eu.st.com (shfdag1node3.st.com [10.75.129.71]) by euls16034.sgp.st.com (STMicroelectronics) with ESMTP id DBBEA224402; Tue, 3 Jan 2023 15:08:07 +0100 (CET) Received: from localhost (10.48.0.157) by SHFDAG1NODE3.st.com (10.75.129.71) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.13; Tue, 3 Jan 2023 15:08:06 +0100 From: Patrick Delaunay To: Alexandre TORGUE , Srinivas Kandagatla , Maxime Coquelin CC: Lionel DEBIEVE , Amelie DELAUNAY , Etienne CARRIERE , Fabrice GASNIER , Patrick Delaunay , , , Subject: [PATCH v4 3/3] nvmem: stm32: detect bsec pta presence for STM32MP15x Date: Tue, 3 Jan 2023 15:05:21 +0100 Message-ID: <20230103150515.v4.3.I59210046e368cfc22bd3cca2afe1653674f8ece8@changeid> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230103140521.187678-1-patrick.delaunay@foss.st.com> References: <20230103140521.187678-1-patrick.delaunay@foss.st.com> MIME-Version: 1.0 X-Originating-IP: [10.48.0.157] X-ClientProxiedBy: SHFCAS1NODE2.st.com (10.75.129.73) To SHFDAG1NODE3.st.com (10.75.129.71) X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.923,Hydra:6.0.545,FMLib:17.11.122.1 definitions=2023-01-03_04,2023-01-03_02,2022-06-22_01 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230103_060818_063498_0AD06B62 X-CRM114-Status: GOOD ( 24.71 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On STM32MP15x SoC, the SMC backend is optional when OP-TEE is used; the PTA BSEC should be used as it is done on STM32MP13x platform, but the BSEC SMC can be also used: it is a legacy mode in OP-TEE, not recommended but used in previous OP-TEE firmware. The presence of OP-TEE is dynamically detected in STM32MP15x device tree and the supported NVMEM backend is dynamically detected: - PTA with stm32_bsec_pta_find - SMC with stm32_bsec_check With OP-TEE but without PTA and SMC detection, the probe is deferred for STM32MP15x devices. On STM32MP13x platform, only the PTA is supported with cfg->ta = true and this detection is skipped. Signed-off-by: Patrick Delaunay --- (no changes since v3) Changes in v3: - use of_find_compatible_node in optee_presence_check function instead of of_find_node_by_path("/firmware/optee") Changes in v2: - Added patch in the serie for BSEC PTA support on STM32MP15x with dynamic detection of OP-TEE presence and SMC support (legacy mode) drivers/nvmem/stm32-romem.c | 33 +++++++++++++++++++++++++++++++-- 1 file changed, 31 insertions(+), 2 deletions(-) diff --git a/drivers/nvmem/stm32-romem.c b/drivers/nvmem/stm32-romem.c index 2edc61925e52..1b90c78301fa 100644 --- a/drivers/nvmem/stm32-romem.c +++ b/drivers/nvmem/stm32-romem.c @@ -159,6 +159,31 @@ static int stm32_bsec_pta_write(void *context, unsigned int offset, void *buf, return stm32_bsec_optee_ta_write(priv->ctx, priv->lower, offset, buf, bytes); } +static bool stm32_bsec_smc_check(void) +{ + u32 val; + int ret; + + /* check that the OP-TEE support the BSEC SMC (legacy mode) */ + ret = stm32_bsec_smc(STM32_SMC_READ_SHADOW, 0, 0, &val); + + return !ret; +} + +static bool optee_presence_check(void) +{ + struct device_node *np; + bool tee_detected = false; + + /* check that the OP-TEE node is present and available. */ + np = of_find_compatible_node(NULL, NULL, "linaro,optee-tz"); + if (np && of_device_is_available(np)) + tee_detected = true; + of_node_put(np); + + return tee_detected; +} + static int stm32_romem_probe(struct platform_device *pdev) { const struct stm32_romem_cfg *cfg; @@ -195,10 +220,14 @@ static int stm32_romem_probe(struct platform_device *pdev) } else { priv->cfg.size = cfg->size; priv->lower = cfg->lower; - if (cfg->ta) { + if (cfg->ta || optee_presence_check()) { rc = stm32_bsec_optee_ta_open(&priv->ctx); /* wait for OP-TEE client driver to be up and ready */ - if (rc) + if (rc == -EPROBE_DEFER) { + /* BSEC PTA is required or SMC not ready */ + if (cfg->ta || !stm32_bsec_smc_check()) + return -EPROBE_DEFER; + } else if (rc) return rc; rc = devm_add_action_or_reset(dev, stm32_bsec_optee_ta_close, priv->ctx); if (rc) {