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Wed, 31 Oct 2018 02:30:52 -0700 (PDT) Received: from lmecxl0911.lme.st.com ([2a04:cec0:1086:999:fd1b:8629:a7fc:68b]) by smtp.gmail.com with ESMTPSA id w14-v6sm10737377wrt.73.2018.10.31.02.30.50 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Wed, 31 Oct 2018 02:30:51 -0700 (PDT) From: Benjamin Gaignard X-Google-Original-From: Benjamin Gaignard To: ohad@wizery.com, bjorn.andersson@linaro.org, robh+dt@kernel.org, mark.rutland@arm.com, alexandre.torgue@st.com Subject: [PATCH 2/5] hwspinlock: add STM32 hwspinlock device Date: Wed, 31 Oct 2018 10:30:29 +0100 Message-Id: <20181031093032.20386-3-benjamin.gaignard@st.com> X-Mailer: git-send-email 2.15.0 In-Reply-To: <20181031093032.20386-1-benjamin.gaignard@st.com> References: <20181031093032.20386-1-benjamin.gaignard@st.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20181031_023105_573858_F37A4D25 X-CRM114-Status: GOOD ( 19.20 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: devicetree@vger.kernel.org, Benjamin Gaignard , linux-remoteproc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-stm32@st-md-mailman.stormreply.com, linux-arm-kernel@lists.infradead.org MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP This patch adds support of hardware semaphores for stm32mp1 SoC. The hardware block provides 32 semaphores. Signed-off-by: Benjamin Gaignard --- drivers/hwspinlock/Kconfig | 9 +++ drivers/hwspinlock/Makefile | 1 + drivers/hwspinlock/stm32_hwspinlock.c | 147 ++++++++++++++++++++++++++++++++++ 3 files changed, 157 insertions(+) create mode 100644 drivers/hwspinlock/stm32_hwspinlock.c diff --git a/drivers/hwspinlock/Kconfig b/drivers/hwspinlock/Kconfig index e895d29500ee..e1a20b460590 100644 --- a/drivers/hwspinlock/Kconfig +++ b/drivers/hwspinlock/Kconfig @@ -59,3 +59,12 @@ config HSEM_U8500 SoC. If unsure, say N. + +config HWSPINLOCK_STM32 + tristate "STM32 Hardware Spinlock device" + depends on MACH_STM32MP157 + depends on HWSPINLOCK + help + Say y here to support the STM32 Hardware Spinlock device. + + If unsure, say N. diff --git a/drivers/hwspinlock/Makefile b/drivers/hwspinlock/Makefile index b87c01a506a4..c0a9505b4dcf 100644 --- a/drivers/hwspinlock/Makefile +++ b/drivers/hwspinlock/Makefile @@ -9,3 +9,4 @@ obj-$(CONFIG_HWSPINLOCK_QCOM) += qcom_hwspinlock.o obj-$(CONFIG_HWSPINLOCK_SIRF) += sirf_hwspinlock.o obj-$(CONFIG_HWSPINLOCK_SPRD) += sprd_hwspinlock.o obj-$(CONFIG_HSEM_U8500) += u8500_hsem.o +obj-$(CONFIG_HWSPINLOCK_STM32) += stm32_hwspinlock.o diff --git a/drivers/hwspinlock/stm32_hwspinlock.c b/drivers/hwspinlock/stm32_hwspinlock.c new file mode 100644 index 000000000000..6a0fafac7389 --- /dev/null +++ b/drivers/hwspinlock/stm32_hwspinlock.c @@ -0,0 +1,147 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) STMicroelectronics SA 2018 + * Author: Benjamin Gaignard for STMicroelectronics. + * License terms: GNU General Public License (GPL), version 2 + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +#include "hwspinlock_internal.h" + +#define STM32_MUTEX_COREID BIT(8) +#define STM32_MUTEX_LOCK_BIT BIT(31) +#define STM32_MUTEX_NUM_LOCKS 32 + +struct stm32_hwspinlock { + struct clk *clk; + struct hwspinlock_device bank; +}; + +static int stm32_hwspinlock_trylock(struct hwspinlock *lock) +{ + void __iomem *lock_addr = lock->priv; + u32 status; + + writel(STM32_MUTEX_LOCK_BIT | STM32_MUTEX_COREID, lock_addr); + status = readl(lock_addr); + + return status == (STM32_MUTEX_LOCK_BIT | STM32_MUTEX_COREID); +} + +static void stm32_hwspinlock_unlock(struct hwspinlock *lock) +{ + void __iomem *lock_addr = lock->priv; + + writel(STM32_MUTEX_COREID, lock_addr); +} + +static const struct hwspinlock_ops stm32_hwspinlock_ops = { + .trylock = stm32_hwspinlock_trylock, + .unlock = stm32_hwspinlock_unlock, +}; + +static int stm32_hwspinlock_probe(struct platform_device *pdev) +{ + struct stm32_hwspinlock *hw; + void __iomem *io_base; + struct resource *res; + size_t array_size; + int i, ret; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + io_base = devm_ioremap_resource(&pdev->dev, res); + if (!io_base) + return -ENOMEM; + + array_size = STM32_MUTEX_NUM_LOCKS * sizeof(struct hwspinlock); + hw = devm_kzalloc(&pdev->dev, sizeof(*hw) + array_size, GFP_KERNEL); + if (!hw) + return -ENOMEM; + + hw->clk = devm_clk_get(&pdev->dev, "hwspinlock"); + if (IS_ERR(hw->clk)) + return PTR_ERR(hw->clk); + + for (i = 0; i < STM32_MUTEX_NUM_LOCKS; i++) + hw->bank.lock[i].priv = io_base + i * sizeof(u32); + + platform_set_drvdata(pdev, hw); + pm_runtime_enable(&pdev->dev); + + ret = hwspin_lock_register(&hw->bank, &pdev->dev, &stm32_hwspinlock_ops, + 0, STM32_MUTEX_NUM_LOCKS); + + if (ret) + pm_runtime_disable(&pdev->dev); + + return ret; +} + +static int stm32_hwspinlock_remove(struct platform_device *pdev) +{ + struct stm32_hwspinlock *hw = platform_get_drvdata(pdev); + int ret; + + ret = hwspin_lock_unregister(&hw->bank); + if (ret) { + dev_err(&pdev->dev, "%s failed: %d\n", __func__, ret); + return ret; + } + + pm_runtime_disable(&pdev->dev); + + return 0; +} + +static int __maybe_unused stm32_hwspinlock_runtime_suspend(struct device *dev) +{ + struct stm32_hwspinlock *hw = dev_get_drvdata(dev); + + clk_disable_unprepare(hw->clk); + + return 0; +} + +static int __maybe_unused stm32_hwspinlock_runtime_resume(struct device *dev) +{ + struct stm32_hwspinlock *hw = dev_get_drvdata(dev); + + clk_prepare_enable(hw->clk); + + return 0; +} + +static const struct dev_pm_ops stm32_hwspinlock_pm_ops = { + SET_RUNTIME_PM_OPS(stm32_hwspinlock_runtime_suspend, + stm32_hwspinlock_runtime_resume, + NULL) +}; + +static const struct of_device_id stm32_hwpinlock_ids[] = { + { .compatible = "st,stm32-hwspinlock", }, + {}, +}; +MODULE_DEVICE_TABLE(of, stm32_hwpinlock_ids); + +static struct platform_driver stm32_hwspinlock_driver = { + .probe = stm32_hwspinlock_probe, + .remove = stm32_hwspinlock_remove, + .driver = { + .name = "stm32_hwspinlock", + .of_match_table = stm32_hwpinlock_ids, + .pm = &stm32_hwspinlock_pm_ops, + }, +}; +module_platform_driver(stm32_hwspinlock_driver); + +MODULE_LICENSE("GPL v2"); +MODULE_DESCRIPTION("Hardware spinlock driver for STM32 SoCs"); +MODULE_AUTHOR("Benjamin Gaignard ");