From mboxrd@z Thu Jan 1 00:00:00 1970 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=-12.7 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,MIME_HEADER_CTYPE_ONLY,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,T_TVD_MIME_NO_HEADERS,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 1B63AC55ABD for ; Tue, 10 Nov 2020 18:38:42 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B5F3E206F1 for ; Tue, 10 Nov 2020 18:38:41 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=broadcom.com header.i=@broadcom.com header.b="V/VVmTtX" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731451AbgKJSik (ORCPT ); Tue, 10 Nov 2020 13:38:40 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43160 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726557AbgKJSii (ORCPT ); Tue, 10 Nov 2020 13:38:38 -0500 Received: from mail-pl1-x644.google.com (mail-pl1-x644.google.com [IPv6:2607:f8b0:4864:20::644]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id ACEB5C0613D1 for ; Tue, 10 Nov 2020 10:38:38 -0800 (PST) Received: by mail-pl1-x644.google.com with SMTP id z1so6902356plo.12 for ; Tue, 10 Nov 2020 10:38:38 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=broadcom.com; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=JNtxpvgTzc5bWZyw6T79iLEmXOORaSxkxOXcRqjSA+I=; b=V/VVmTtXtVXUoX0xiC+htY7zcW6cDZ/uZrpw8Vv1p0KSrc0jY/U0wHOTlxdsBmT/q7 r1rhVY+SkgJ1qsiCGrF+qclgswNfzxWRCqsuC2mBzmszQtmT1K/25f/9OQ/Zl+h1ju5B acjLvA149zV09j/yr6EjiTxyC4XNguiMmUTSQ= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=JNtxpvgTzc5bWZyw6T79iLEmXOORaSxkxOXcRqjSA+I=; b=jxEYk9H8GMZpJ62/8trolCn7ueu+NlTtfn3MUyOZpMEtQ1SYlPT+4ZuBEXeeHlCN8/ 2Snf6GjXmaEhGibB4ySS+J7ESu3DY9aYnV0E4/+faOZkiwG87Yd2sVNebh7HC99UDrA6 txP2fp3hIXIOD6HTSZMijsLNY22EDNTwjdm7CpUgraLFXoAUHMm/enJGdp4uhZvYI4tz lfYocvxFx/S8JTe4+LhsC70J2xabsY7K8+nWYDAeBwADfLnHFxqZXsI3NAUWB3wR+zCa zjU8ap3Peq6IneEQC6tv5ykVH7nJJPdfkwHycKCdgYQP/sDXvHH1rHVAjxPG6SEYmlbx 3+3A== X-Gm-Message-State: AOAM532ixwes7MJX3bFPpXNbBm5dCXu4rtbHhbTeSQkNUNxGCeEmvBfO f5KjderVZ1aYv6uq04vEB3LSFQ== X-Google-Smtp-Source: ABdhPJwZst0MZyXR65rSaIlrFNRU9vo5YsOT+aFXxCustmHvFtkJ62MJjWSkSdoywaMu8jqj5N2CpQ== X-Received: by 2002:a17:902:d211:b029:d7:cd5e:2857 with SMTP id t17-20020a170902d211b02900d7cd5e2857mr14664521ply.45.1605033518156; Tue, 10 Nov 2020 10:38:38 -0800 (PST) Received: from stbsrv-and-01.and.broadcom.net ([192.19.231.250]) by smtp.gmail.com with ESMTPSA id x18sm9187988pfi.206.2020.11.10.10.38.36 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 10 Nov 2020 10:38:37 -0800 (PST) From: Jim Quinlan To: Sudeep Holla , bcm-kernel-feedback-list@broadcom.com, james.quinlan@broadcom.com Cc: linux-kernel@vger.kernel.org (open list) Subject: [PATCH v1 2/2] firmware: arm_scmi: Augment SMC/HVC to allow optional interrupt Date: Tue, 10 Nov 2020 13:38:19 -0500 Message-Id: <20201110183827.19731-2-james.quinlan@broadcom.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20201110183827.19731-1-james.quinlan@broadcom.com> References: <20201110183827.19731-1-james.quinlan@broadcom.com> Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="000000000000b8ec7405b3c4fca6" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --000000000000b8ec7405b3c4fca6 The SMC/HVC SCMI transport is modified to allow the completion of an SCMI message to be indicated by an interrupt rather than the return of the smc call. This accommodates the existing behavior of the BrcmSTB SCMI "platform" whose SW is already out in the field and cannot be changed. Signed-off-by: Jim Quinlan --- drivers/firmware/arm_scmi/smc.c | 31 +++++++++++++++++++++++++++++++ 1 file changed, 31 insertions(+) diff --git a/drivers/firmware/arm_scmi/smc.c b/drivers/firmware/arm_scmi/smc.c index 82a82a5dc86a..3bf935dbd00e 100644 --- a/drivers/firmware/arm_scmi/smc.c +++ b/drivers/firmware/arm_scmi/smc.c @@ -9,9 +9,11 @@ #include #include #include +#include #include #include #include +#include #include #include "common.h" @@ -23,6 +25,8 @@ * @shmem: Transmit/Receive shared memory area * @shmem_lock: Lock to protect access to Tx/Rx shared memory area * @func_id: smc/hvc call function id + * @irq: Optional; employed when platforms indicates msg completion by intr. + * @tx_complete: Optional, employed only when irq is valid. */ struct scmi_smc { @@ -30,8 +34,19 @@ struct scmi_smc { struct scmi_shared_mem __iomem *shmem; struct mutex shmem_lock; u32 func_id; + int irq; + struct completion tx_complete; }; +static irqreturn_t smc_msg_done_isr(int irq, void *data) +{ + struct scmi_smc *scmi_info = data; + + complete(&scmi_info->tx_complete); + + return IRQ_HANDLED; +} + static bool smc_chan_available(struct device *dev, int idx) { struct device_node *np = of_parse_phandle(dev->of_node, "shmem", 0); @@ -79,6 +94,20 @@ static int smc_chan_setup(struct scmi_chan_info *cinfo, struct device *dev, if (ret < 0) return ret; + /* Optional feature -- signal message completion using an interrupt */ + ret = of_irq_get_byname(cdev->of_node, "msg-serviced"); + if (ret > 0) { + scmi_info->irq = ret; + ret = devm_request_irq(dev, ret, smc_msg_done_isr, + IRQF_NO_SUSPEND, + dev_name(dev), + scmi_info); + if (ret) { + dev_err(dev, "failed to setup SCMI smc irq\n"); + return ret; + } + init_completion(&scmi_info->tx_complete); + } scmi_info->func_id = func_id; scmi_info->cinfo = cinfo; mutex_init(&scmi_info->shmem_lock); @@ -111,6 +140,8 @@ static int smc_send_message(struct scmi_chan_info *cinfo, shmem_tx_prepare(scmi_info->shmem, xfer); arm_smccc_1_1_invoke(scmi_info->func_id, 0, 0, 0, 0, 0, 0, 0, &res); + if (scmi_info->irq) + wait_for_completion(&scmi_info->tx_complete); scmi_rx_callback(scmi_info->cinfo, shmem_read_header(scmi_info->shmem)); mutex_unlock(&scmi_info->shmem_lock); -- 2.17.1 --000000000000b8ec7405b3c4fca6 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIIQQwYJKoZIhvcNAQcCoIIQNDCCEDACAQExDzANBglghkgBZQMEAgEFADALBgkqhkiG9w0BBwGg gg2YMIIE6DCCA9CgAwIBAgIOSBtqCRO9gCTKXSLwFPMwDQYJKoZIhvcNAQELBQAwTDEgMB4GA1UE CxMXR2xvYmFsU2lnbiBSb290IENBIC0gUjMxEzARBgNVBAoTCkdsb2JhbFNpZ24xEzARBgNVBAMT Ckdsb2JhbFNpZ24wHhcNMTYwNjE1MDAwMDAwWhcNMjQwNjE1MDAwMDAwWjBdMQswCQYDVQQGEwJC RTEZMBcGA1UEChMQR2xvYmFsU2lnbiBudi1zYTEzMDEGA1UEAxMqR2xvYmFsU2lnbiBQZXJzb25h bFNpZ24gMiBDQSAtIFNIQTI1NiAtIEczMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA 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