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Message-Id: <20181031093032.20386-3-benjamin.gaignard@st.com>
Date: Wed, 31 Oct 2018 10:30:29 +0100
From: Benjamin Gaignard <benjamin.gaignard@...aro.org>
To: ohad@...ery.com, bjorn.andersson@...aro.org, robh+dt@...nel.org,
mark.rutland@....com, alexandre.torgue@...com
Cc: linux-remoteproc@...r.kernel.org, devicetree@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
linux-stm32@...md-mailman.stormreply.com,
Benjamin Gaignard <benjamin.gaignard@...com>
Subject: [PATCH 2/5] hwspinlock: add STM32 hwspinlock device
This patch adds support of hardware semaphores for stm32mp1 SoC.
The hardware block provides 32 semaphores.
Signed-off-by: Benjamin Gaignard <benjamin.gaignard@...com>
---
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 <benjamin.gaignard@...com> for STMicroelectronics.
+ * License terms: GNU General Public License (GPL), version 2
+ */
+
+#include <linux/clk.h>
+#include <linux/hwspinlock.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+
+#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 <benjamin.gaignard@...com>");
--
2.15.0
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