From nobody Thu Oct 2 02:15:13 2025 Received: from mail-pg1-f228.google.com (mail-pg1-f228.google.com [209.85.215.228]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 25EE025F7A4 for ; Mon, 29 Sep 2025 20:07:11 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.215.228 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1759176433; cv=none; b=glqXz0zDbdKiKqoGrALYub6Cp/LGUKcoFpdSB+nX4kp1L6vsIevVYA1MyCkFSuQxgYeAqNcQlMdfRMWcfRZrS8edu+ZeNmJQDN1L4PLvbYcwT1Vne+U08oWc7oQoFJj/VOD3ntLT6kqf/S/1t9L5Ljuom2qVgly5/zj1t+kf6EQ= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1759176433; c=relaxed/simple; bh=0JiNpHHORJSEltvIbaftdDsfMyRa/xjCyZoXBWOojB4=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=Lcf7C0jgxnDCZNaBC1ZwPOGIVrO8jimTeQmM8KfGU2TINIky35CDzGZFQlnjk7Mx5ZEpk6uel/ZVUEeVEpu5i+1DnarkcOjjvZcdu7RMmKbWOB/cwarmNGzT643SUFQ0tqyvdKGEt3dFcyzByp5ey6sUu67vcKHK6p6mfbcbR08= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=broadcom.com; spf=fail smtp.mailfrom=broadcom.com; dkim=pass (1024-bit key) header.d=broadcom.com header.i=@broadcom.com header.b=QA8Cu5ka; arc=none smtp.client-ip=209.85.215.228 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=broadcom.com Authentication-Results: smtp.subspace.kernel.org; spf=fail smtp.mailfrom=broadcom.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=broadcom.com header.i=@broadcom.com header.b="QA8Cu5ka" Received: by mail-pg1-f228.google.com with SMTP id 41be03b00d2f7-b55197907d1so3850552a12.0 for ; Mon, 29 Sep 2025 13:07:11 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1759176431; x=1759781231; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:dkim-signature :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=wA3uOR00VQG2MYj5nJtUQY0pkQ46ZSnhVcxuOfdZq+A=; b=D+mZvi4mEqqY3VngOMOvEX5zxZAHVNv/pF9QywAX0wMg6/Cw4TqNkjj3dXN8RLVdhg hczlOMpkaozhOPrhZsrJ0iWgnTTnYZaJDOc0BJaHLJhAI5uhmvSurxxrnyrWIB/mnqcq l9UJEwilJN8rqpz5Sf/mElhXqj60atJ+kJjCKhLxnSPkJkoxFHQX/0k8sNGclATgvj1F mGjaJh5sc9rnqJWkAKBjK+5N26AAScFHHaquYb7poIwwUaSHX7qbsidplIoGpnEAHSDw yJmbbnALpXCAjAUAE0+/pZIL+ZTfK5DOAQOUahLJ5ENjx2tbjmJxonwsLKAYYNU9KnvI kX5w== X-Forwarded-Encrypted: i=1; AJvYcCW/DKuO26Xl1hWAGtRX4NgkwuFd8xsABJxTdtutkUBcJIPdiTY6R5yWn6JxM79heGuWlyuJrvZBRtnWQQg=@vger.kernel.org X-Gm-Message-State: AOJu0YxxDTiMVY/m0FWwjOSZNM44jzCS5jBt0HsXknlaV/XC+qJmYd9q wOHcvOdNnAcwIEqFKY3xqyO/abb9gi4oku29vRGigaNNsVRT5NW1ngJACqxdE9uVC3dr/cDIeOx 0Qu1gmAyok54dJWrzMffuvIUaqoeU9tZMYq7dzttjmL+7oiDNA91q3C7NrBBfl5LQXmNOpJW7Bz 31oAZrU2n4uR6w5pL7Z5q4BeGz2PwQssSpxkt84+lUe0fONyd1q7URJlt3R8pa4XmdPORUGNXJF fr4uOO7eXRBaFd0 X-Gm-Gg: ASbGncubo6+7xTqUcj+ItC8otJPYCqCoTSSBcE5AhEIUsuDRxI2ZnEOsHgc2xDZDrCA LFyQpojv9XR3SfhO/Sl0H6TKHXzYCLgRUCZ9FtyifJIm1atBnYJA41Ksc0SJDdWLz8Df+Gpddu+ otmQ0g3W3Y9uyls6d1vWvXRkRkOiIn8NTdZe/AaPBoRIEc7J2haP02+JQ28B1euPXpAB9m9py6m JYOknTJLlNXq2lPFDfJo/suHgGdR7hs1bHYPueM4o+FkfaiY8QIHtkmSYctwer3kX1y2nP5giUv kt/CFPETbIk+DmYVc5YYZB90N81IIK/4n+BxHHcpRo/o7YVtl/VnVitkHgZvjFU17vFljcCWQ/8 lfsUn8/vpOzSju5ljVNId X-Google-Smtp-Source: AGHT+IE7t4YTsjVDYBmhgX3s690G81MF1RX7xIG1YTYZJEFHFs1sP9YS8Z0Cl6IQtQF+XfqHf6/wS00wzFxz X-Received: by 2002:a17:903:13c8:b0:283:c950:a76f with SMTP id d9443c01a7336-283c96f311cmr79747085ad.43.1759176431294; Mon, 29 Sep 2025 13:07:11 -0700 (PDT) Received: from smtp-us-east1-p01-i01-si01.dlp.protect.broadcom.com ([144.49.247.127]) by smtp-relay.gmail.com with ESMTPS id d9443c01a7336-27ed67e6a34sm9964525ad.38.2025.09.29.13.07.10 for (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Mon, 29 Sep 2025 13:07:11 -0700 (PDT) X-Relaying-Domain: broadcom.com X-CFilter-Loop: Reflected Received: by mail-pj1-f69.google.com with SMTP id 98e67ed59e1d1-32ee4998c50so4572426a91.3 for ; Mon, 29 Sep 2025 13:07:10 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=broadcom.com; s=google; t=1759176429; x=1759781229; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=wA3uOR00VQG2MYj5nJtUQY0pkQ46ZSnhVcxuOfdZq+A=; b=QA8Cu5katZ4+YsdeF0z9cRRtT3nJdYwa4UZBK935GyI+j8NEAaIHz91+ipctD+qyZg CHwtouaLUlMobGdlOZw7icLyvPFjimfnKdIF/jsl7TrbImCBJpdjJ+nRnZ+DfNmUbnqe F9wuezyjOsj8ZzmaYq3QnOpwJKtIWQ1qTi8O0= X-Forwarded-Encrypted: i=1; AJvYcCW4IoN2CrU2gw/8ejt7tPZCIHHZZDAC3WtRCWSdUZ1QC/dZ0cd9rH6Rtvt/1OrCpJJEkerdfYNEPmfg1sM=@vger.kernel.org X-Received: by 2002:a17:90b:3143:b0:32e:1ff5:5af4 with SMTP id 98e67ed59e1d1-3342a2fe9ddmr18545837a91.35.1759176429373; Mon, 29 Sep 2025 13:07:09 -0700 (PDT) X-Received: by 2002:a17:90b:3143:b0:32e:1ff5:5af4 with SMTP id 98e67ed59e1d1-3342a2fe9ddmr18545816a91.35.1759176428992; Mon, 29 Sep 2025 13:07:08 -0700 (PDT) Received: from mail.broadcom.net ([192.19.144.250]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-33838735194sm2121479a91.22.2025.09.29.13.07.07 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 29 Sep 2025 13:07:08 -0700 (PDT) From: Kamal Dasu To: bcm-kernel-feedback-list@broadcom.com, andersson@kernel.org, baolin.wang@linux.alibaba.com, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, florian.fainelli@broadcom.com Cc: linux-remoteproc@vger.kernel.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Kamal Dasu Subject: [PATCH 2/3] hwspinlock: brcmstb hardware semaphore support Date: Mon, 29 Sep 2025 16:06:26 -0400 Message-Id: <20250929200628.3699525-4-kamal.dasu@broadcom.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20250929200628.3699525-1-kamal.dasu@broadcom.com> References: <20250929200628.3699525-1-kamal.dasu@broadcom.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-DetectorID-Processed: b00c1d49-9d2e-4205-b15f-d015386d3d5e Content-Type: text/plain; charset="utf-8" Added support for brmstb_hwspinlock driver that makes use of the hwspinlock framework. Driver uses SUN_TOP_CTRL_SEMAPHORE_[1:15] registers to implement the hardware semaphore. With this change other brcmstb drivers can use hwspin_trylock() and hwspin_unlock() apis and make use of this hwspinlock framework. Other driver dt nodes just need to use a reference to the &hwspinlock and the lock id they want to use. e.g. hwlocks =3D <&hwspinlock0 0>; Signed-off-by: Kamal Dasu --- drivers/hwspinlock/Kconfig | 9 +++ drivers/hwspinlock/Makefile | 1 + drivers/hwspinlock/brcmstb_hwspinlock.c | 98 +++++++++++++++++++++++++ 3 files changed, 108 insertions(+) create mode 100644 drivers/hwspinlock/brcmstb_hwspinlock.c diff --git a/drivers/hwspinlock/Kconfig b/drivers/hwspinlock/Kconfig index 3874d15b0e9b..551afa8df2d0 100644 --- a/drivers/hwspinlock/Kconfig +++ b/drivers/hwspinlock/Kconfig @@ -63,4 +63,13 @@ config HSEM_U8500 =20 If unsure, say N. =20 +config HWSPINLOCK_BRCMSTB + tristate "Broadcom Setttop Hardware Semaphore functionality" + depends on ARCH_BRCMSTB || COMPILE_TEST + help + Broadcom settop hwspinlock driver. + Say y here to support the Broadcom Hardware Semaphore functionality, wh= ich + provides a synchronisation mechanism on the SoC. + + If unsure, say N. endif # HWSPINLOCK diff --git a/drivers/hwspinlock/Makefile b/drivers/hwspinlock/Makefile index a0f16c9aaa82..4f5c05403209 100644 --- a/drivers/hwspinlock/Makefile +++ b/drivers/hwspinlock/Makefile @@ -10,3 +10,4 @@ obj-$(CONFIG_HWSPINLOCK_SPRD) +=3D sprd_hwspinlock.o obj-$(CONFIG_HWSPINLOCK_STM32) +=3D stm32_hwspinlock.o obj-$(CONFIG_HWSPINLOCK_SUN6I) +=3D sun6i_hwspinlock.o obj-$(CONFIG_HSEM_U8500) +=3D u8500_hsem.o +obj-$(CONFIG_HWSPINLOCK_BRCMSTB) +=3D brcmstb_hwspinlock.o diff --git a/drivers/hwspinlock/brcmstb_hwspinlock.c b/drivers/hwspinlock/b= rcmstb_hwspinlock.c new file mode 100644 index 000000000000..56206431a94c --- /dev/null +++ b/drivers/hwspinlock/brcmstb_hwspinlock.c @@ -0,0 +1,98 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * brcmstb HWSEM driver + * + * Copyright (C) 2025 Broadcom + * + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include "hwspinlock_internal.h" + +#define BRCMSTB_MAX_SEMAPHORES 16 +#define RESET_SEMAPHORE 0 + +#define HWSPINLOCK_VAL 'L' + +static int brcmstb_hwspinlock_trylock(struct hwspinlock *lock) +{ + void __iomem *lock_addr =3D (void __iomem *)lock->priv; + + writel(HWSPINLOCK_VAL, lock_addr); + + return (readl(lock_addr) =3D=3D HWSPINLOCK_VAL); +} + +static void brcmstb_hwspinlock_unlock(struct hwspinlock *lock) +{ + void __iomem *lock_addr =3D (void __iomem *)lock->priv; + + /* release the lock by writing 0 to it */ + writel(RESET_SEMAPHORE, lock_addr); +} + +static void brcmstb_hwspinlock_relax(struct hwspinlock *lock) +{ + ndelay(50); +} + +static const struct hwspinlock_ops brcmstb_hwspinlock_ops =3D { + .trylock =3D brcmstb_hwspinlock_trylock, + .unlock =3D brcmstb_hwspinlock_unlock, + .relax =3D brcmstb_hwspinlock_relax, +}; + +static int brcmstb_hwspinlock_probe(struct platform_device *pdev) +{ + struct hwspinlock_device *bank; + struct hwspinlock *hwlock; + void __iomem *io_base; + int i, num_locks =3D BRCMSTB_MAX_SEMAPHORES; + + io_base =3D devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(io_base)) { + dev_err(&pdev->dev, "semaphore iobase mapping error\n"); + return PTR_ERR(io_base); + } + + bank =3D devm_kzalloc(&pdev->dev, struct_size(bank, lock, num_locks), + GFP_KERNEL); + if (!bank) + return -ENOMEM; + + platform_set_drvdata(pdev, bank); + + for (i =3D 0, hwlock =3D &bank->lock[0]; i < num_locks; i++, hwlock++) + hwlock->priv =3D (void __iomem *)(io_base + sizeof(u32) * i); + + return devm_hwspin_lock_register(&pdev->dev, bank, + &brcmstb_hwspinlock_ops, + 0, num_locks); +} + +static const struct of_device_id brcmstb_hwspinlock_ids[] =3D { + { .compatible =3D "brcm,brcmstb-hwspinlock", }, + { /* end */ }, +}; +MODULE_DEVICE_TABLE(of, brcmstb_hwspinlock_ids); + +static struct platform_driver brcmstb_hwspinlock_driver =3D { + .probe =3D brcmstb_hwspinlock_probe, + .driver =3D { + .name =3D "brcmstb_hwspinlock", + .of_match_table =3D brcmstb_hwspinlock_ids, + }, +}; + +module_platform_driver(brcmstb_hwspinlock_driver); + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("Hardware Spinlock driver for brcmstb"); +MODULE_AUTHOR("Kamal Dasu "); --=20 2.34.1