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[144.49.247.121]) by smtp-relay.gmail.com with ESMTPS id 8926c6da1cb9f-56a64211cb2sm720209173.7.2025.09.29.13.07.10 for (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Mon, 29 Sep 2025 13:07:10 -0700 (PDT) X-Relaying-Domain: broadcom.com X-CFilter-Loop: Reflected Received: by mail-pg1-f197.google.com with SMTP id 41be03b00d2f7-b55443b4114so3507719a12.2 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=lists.infradead.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=QA1uQrie0CiducPTFHvZKaz9tx/ieg7+Ru9IxByAsLxeVnzx8wbhtKp80iT1lGbhf7 PwMlBue3twShgNlsyp8e5qKc9FgSPkhpe5F+MaQnkLIIOR01kDVD1Uz4qNCwEpevQzS+ uDsnkqFUujrQPKcObRLens+3jvopsK8pXdWtU= X-Forwarded-Encrypted: i=1; AJvYcCWUd5wUzsrAG8+GOtSUW9RetfYXNrM6mET+dQg4Z4Idr9YXRlYcjrlVVFxBIQPE68fTuvLFkFnPCLrXf7h6VkaN@lists.infradead.org X-Received: by 2002:a17:90b:3143:b0:32e:1ff5:5af4 with SMTP id 98e67ed59e1d1-3342a2fe9ddmr18545841a91.35.1759176429381; 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> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-DetectorID-Processed: b00c1d49-9d2e-4205-b15f-d015386d3d5e X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250929_130715_048903_A2E4B069 X-CRM114-Status: GOOD ( 22.72 ) 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 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 = <&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 If unsure, say N. +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, which + 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-$(CONFIG_HWSPINLOCK_SPRD) += sprd_hwspinlock.o obj-$(CONFIG_HWSPINLOCK_STM32) += stm32_hwspinlock.o obj-$(CONFIG_HWSPINLOCK_SUN6I) += sun6i_hwspinlock.o obj-$(CONFIG_HSEM_U8500) += u8500_hsem.o +obj-$(CONFIG_HWSPINLOCK_BRCMSTB) += brcmstb_hwspinlock.o diff --git a/drivers/hwspinlock/brcmstb_hwspinlock.c b/drivers/hwspinlock/brcmstb_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 = (void __iomem *)lock->priv; + + writel(HWSPINLOCK_VAL, lock_addr); + + return (readl(lock_addr) == HWSPINLOCK_VAL); +} + +static void brcmstb_hwspinlock_unlock(struct hwspinlock *lock) +{ + void __iomem *lock_addr = (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 = { + .trylock = brcmstb_hwspinlock_trylock, + .unlock = brcmstb_hwspinlock_unlock, + .relax = 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 = BRCMSTB_MAX_SEMAPHORES; + + io_base = 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 = devm_kzalloc(&pdev->dev, struct_size(bank, lock, num_locks), + GFP_KERNEL); + if (!bank) + return -ENOMEM; + + platform_set_drvdata(pdev, bank); + + for (i = 0, hwlock = &bank->lock[0]; i < num_locks; i++, hwlock++) + hwlock->priv = (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[] = { + { .compatible = "brcm,brcmstb-hwspinlock", }, + { /* end */ }, +}; +MODULE_DEVICE_TABLE(of, brcmstb_hwspinlock_ids); + +static struct platform_driver brcmstb_hwspinlock_driver = { + .probe = brcmstb_hwspinlock_probe, + .driver = { + .name = "brcmstb_hwspinlock", + .of_match_table = brcmstb_hwspinlock_ids, + }, +}; + +module_platform_driver(brcmstb_hwspinlock_driver); + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("Hardware Spinlock driver for brcmstb"); +MODULE_AUTHOR("Kamal Dasu "); -- 2.34.1