From patchwork Tue Dec 13 14:04:09 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sibi Sankar X-Patchwork-Id: 633697 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 BF9F0C10F1D for ; Tue, 13 Dec 2022 14:06:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235067AbiLMOGC (ORCPT ); Tue, 13 Dec 2022 09:06:02 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34562 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235832AbiLMOFx (ORCPT ); Tue, 13 Dec 2022 09:05:53 -0500 Received: from mx0b-0031df01.pphosted.com (mx0b-0031df01.pphosted.com [205.220.180.131]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7933A20F5A; Tue, 13 Dec 2022 06:05:40 -0800 (PST) Received: from pps.filterd (m0279870.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 2BDDhTwT015709; Tue, 13 Dec 2022 14:05:03 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=7+F7z+Ta8EpscKUbPoTu/myv8SUS28PNc0GSWR9l3dY=; b=MPMFy4o3NF8jUQRCJwRMKvFj48hAppxtMyI3OZvX/lBkDEvOKARM9yEdDrPz/K1pt9+l Oh3JpL8yD+9BbByrIbr0Dx3NbnP89RJ69OQHYPZ/PGDp0M3u40XVfMMWD3ZTls2+3yQp Gzp5F2mecq4XITEYvQ1ZSO3kIudwjiDaBtJAObO+VnKmsgvcZ16Lyhv2Z8mB4hhflF7i 2g6SbX+6no3mRp4SxduOS1wfvMXQwhayL+ubjwaZmWhUF5hzBz9EnbdSB7ihBxdZlXLi djTqAfL4FAt68cGhlH/sOO0Ew90NAxK2bgwLziNTFgZbt1ov5Za6ZyIZV0Ts3ABTDEVi hw== Received: from nalasppmta02.qualcomm.com (Global_NAT1.qualcomm.com [129.46.96.20]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 3mej4w9dv6-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 13 Dec 2022 14:05:03 +0000 Received: from nalasex01a.na.qualcomm.com (nalasex01a.na.qualcomm.com [10.47.209.196]) by NALASPPMTA02.qualcomm.com (8.17.1.5/8.17.1.5) with ESMTPS id 2BDE51kN024525 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 13 Dec 2022 14:05:01 GMT Received: from blr-ubuntu-87.ap.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 15.2.986.36; Tue, 13 Dec 2022 06:04:56 -0800 From: Sibi Sankar To: , , CC: , , , , , , , , , , , , Sibi Sankar , Gaurav Kohli Subject: [PATCH 2/2] mailbox: Add support for QTI CPUCP mailbox controller Date: Tue, 13 Dec 2022 19:34:09 +0530 Message-ID: <20221213140409.772-3-quic_sibis@quicinc.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20221213140409.772-1-quic_sibis@quicinc.com> References: <20221213140409.772-1-quic_sibis@quicinc.com> MIME-Version: 1.0 X-Originating-IP: [10.80.80.8] X-ClientProxiedBy: nasanex01b.na.qualcomm.com (10.46.141.250) 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-ORIG-GUID: -rzQYEfOF2ROQyWGtM2BHjv3g9a5wfIk X-Proofpoint-GUID: -rzQYEfOF2ROQyWGtM2BHjv3g9a5wfIk 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=2022-12-13_03,2022-12-13_01,2022-06-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 bulkscore=0 clxscore=1011 adultscore=0 priorityscore=1501 phishscore=0 impostorscore=0 lowpriorityscore=0 mlxlogscore=999 suspectscore=0 mlxscore=0 spamscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2210170000 definitions=main-2212130125 Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org Add support for CPUSS Control Processor (CPUCP) mailbox controller, this driver enables communication between AP and CPUCP by acting as a doorbell between them. Signed-off-by: Gaurav Kohli [sibis: moved to mailbox and misc. cleanups] Signed-off-by: Sibi Sankar --- drivers/mailbox/Kconfig | 9 ++ drivers/mailbox/Makefile | 2 + drivers/mailbox/qcom-cpucp-mbox.c | 176 ++++++++++++++++++++++++++++++++++++++ 3 files changed, 187 insertions(+) create mode 100644 drivers/mailbox/qcom-cpucp-mbox.c diff --git a/drivers/mailbox/Kconfig b/drivers/mailbox/Kconfig index 05d6fae800e3..7766e0ad2f12 100644 --- a/drivers/mailbox/Kconfig +++ b/drivers/mailbox/Kconfig @@ -284,6 +284,15 @@ config SPRD_MBOX to send message between application processors and MCU. Say Y here if you want to build the Spreatrum mailbox controller driver. +config QCOM_CPUCP_MBOX + tristate "Qualcomm Technologies, Inc. CPUCP mailbox driver" + depends on ARCH_QCOM || COMPILE_TEST + help + Qualcomm Technologies, Inc. CPUSS Control Processor (CPUCP) mailbox + controller driver enables communication between AP and CPUCP by + acting as a doorbell between them. Say Y here if you want to build + this driver. + config QCOM_IPCC tristate "Qualcomm Technologies, Inc. IPCC driver" depends on ARCH_QCOM || COMPILE_TEST diff --git a/drivers/mailbox/Makefile b/drivers/mailbox/Makefile index fc9376117111..195b7e40541f 100644 --- a/drivers/mailbox/Makefile +++ b/drivers/mailbox/Makefile @@ -59,6 +59,8 @@ obj-$(CONFIG_SUN6I_MSGBOX) += sun6i-msgbox.o obj-$(CONFIG_SPRD_MBOX) += sprd-mailbox.o +obj-$(CONFIG_QCOM_CPUCP_MBOX) += qcom-cpucp-mbox.o + obj-$(CONFIG_QCOM_IPCC) += qcom-ipcc.o obj-$(CONFIG_APPLE_MAILBOX) += apple-mailbox.o diff --git a/drivers/mailbox/qcom-cpucp-mbox.c b/drivers/mailbox/qcom-cpucp-mbox.c new file mode 100644 index 000000000000..063bb2d80f3e --- /dev/null +++ b/drivers/mailbox/qcom-cpucp-mbox.c @@ -0,0 +1,176 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (c) 2022 Qualcomm Innovation Center, Inc. All rights reserved. + */ + +#include +#include +#include +#include +#include +#include + +/* CPUCP Register offsets */ +#define CPUCP_INTR_CLEAR_REG 0x8 +#define CPUCP_INTR_STATUS_REG 0xC +#define CPUCP_SEND_IRQ_REG 0xC + +#define CPUCP_IRQ_CLEAR BIT(3) +#define CPUCP_IRQ_STATUS_ASSERTED BIT(3) +#define CPUCP_SEND_IRQ BIT(28) + +/** + * struct qcom_cpucp_mbox - Holder for the mailbox driver + * @mbox: The mailbox controller + * @chan: The mailbox channel + * @tx_base: Base address of the CPUCP tx registers + * @rx_base: Base address of the CPUCP rx registers + * @dev: Device associated with this instance + * @lock: Lock protecting private + * @irq: CPUCP to AP irq + */ +struct qcom_cpucp_mbox { + struct mbox_controller mbox; + struct mbox_chan chan; + void __iomem *tx_base; + void __iomem *rx_base; + struct device *dev; + int irq; + + /* control access to the chan private data */ + spinlock_t lock; +}; + +static inline struct qcom_cpucp_mbox *to_qcom_cpucp_mbox(struct mbox_controller *mbox) +{ + return container_of(mbox, struct qcom_cpucp_mbox, mbox); +} + +static irqreturn_t qcom_cpucp_mbox_irq_fn(int irq, void *data) +{ + struct qcom_cpucp_mbox *cpucp = data; + unsigned long flags; + u32 val; + + val = readl(cpucp->rx_base + CPUCP_INTR_STATUS_REG); + if (val & CPUCP_IRQ_STATUS_ASSERTED) { + writel(CPUCP_IRQ_CLEAR, cpucp->rx_base + CPUCP_INTR_CLEAR_REG); + + spin_lock_irqsave(&cpucp->lock, flags); + if (cpucp->chan.con_priv) + mbox_chan_received_data(&cpucp->chan, NULL); + spin_unlock_irqrestore(&cpucp->lock, flags); + } + + return IRQ_HANDLED; +} + +static int qcom_cpucp_mbox_send_data(struct mbox_chan *chan, void *data) +{ + struct qcom_cpucp_mbox *cpucp = to_qcom_cpucp_mbox(chan->mbox); + + writel(CPUCP_SEND_IRQ, cpucp->tx_base + CPUCP_SEND_IRQ_REG); + + return 0; +} + +static void qcom_cpucp_mbox_shutdown(struct mbox_chan *chan) +{ + struct qcom_cpucp_mbox *cpucp = to_qcom_cpucp_mbox(chan->mbox); + unsigned long flags; + + spin_lock_irqsave(&cpucp->lock, flags); + chan->con_priv = NULL; + spin_unlock_irqrestore(&cpucp->lock, flags); +} + +static const struct mbox_chan_ops cpucp_mbox_chan_ops = { + .send_data = qcom_cpucp_mbox_send_data, + .shutdown = qcom_cpucp_mbox_shutdown +}; + +static struct mbox_chan *qcom_cpucp_mbox_xlate(struct mbox_controller *mbox, + const struct of_phandle_args *ph) +{ + struct qcom_cpucp_mbox *cpucp = to_qcom_cpucp_mbox(mbox); + + if (ph->args_count != 0) + return ERR_PTR(-EINVAL); + + if (mbox->chans[0].con_priv) + return ERR_PTR(-EBUSY); + + mbox->chans[0].con_priv = cpucp; + + return &mbox->chans[0]; +} + +static int qcom_cpucp_mbox_probe(struct platform_device *pdev) +{ + struct qcom_cpucp_mbox *cpucp; + struct mbox_controller *mbox; + int ret; + + cpucp = devm_kzalloc(&pdev->dev, sizeof(*cpucp), GFP_KERNEL); + if (!cpucp) + return -ENOMEM; + + spin_lock_init(&cpucp->lock); + cpucp->dev = &pdev->dev; + + cpucp->tx_base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(cpucp->tx_base)) + return PTR_ERR(cpucp->tx_base); + + cpucp->rx_base = devm_platform_ioremap_resource(pdev, 1); + if (IS_ERR(cpucp->rx_base)) + return PTR_ERR(cpucp->rx_base); + + cpucp->irq = platform_get_irq(pdev, 0); + if (cpucp->irq < 0) + return cpucp->irq; + + mbox = &cpucp->mbox; + mbox->dev = cpucp->dev; + mbox->num_chans = 1; + mbox->chans = &cpucp->chan; + mbox->ops = &cpucp_mbox_chan_ops; + mbox->of_xlate = qcom_cpucp_mbox_xlate; + mbox->txdone_irq = false; + mbox->txdone_poll = false; + + ret = devm_mbox_controller_register(&pdev->dev, mbox); + if (ret) + return ret; + + ret = devm_request_irq(&pdev->dev, cpucp->irq, qcom_cpucp_mbox_irq_fn, + IRQF_TRIGGER_HIGH | IRQF_NO_SUSPEND, "qcom_cpucp_mbox", cpucp); + if (ret < 0) { + dev_err(&pdev->dev, "Failed to register the irq: %d\n", ret); + return ret; + } + + platform_set_drvdata(pdev, cpucp); + + return 0; +} + +static const struct of_device_id qcom_cpucp_mbox_of_match[] = { + { .compatible = "qcom,cpucp-mbox"}, + {} +}; +MODULE_DEVICE_TABLE(of, qcom_cpucp_mbox_of_match); + +static struct platform_driver qcom_cpucp_mbox_driver = { + .probe = qcom_cpucp_mbox_probe, + .driver = { + .name = "qcom_cpucp_mbox", + .of_match_table = qcom_cpucp_mbox_of_match, + }, +}; +module_platform_driver(qcom_cpucp_mbox_driver); + +MODULE_AUTHOR("Gaurav Kohli "); +MODULE_AUTHOR("Sibi Sankar "); +MODULE_DESCRIPTION("Qualcomm Technologies, Inc. CPUSS Control Processor Mailbox driver"); +MODULE_LICENSE("GPL");