250 lines
6.9 KiB
Diff
250 lines
6.9 KiB
Diff
From da8d8b897bc61f58b87237394c4a9ff4f89e906d Mon Sep 17 00:00:00 2001
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From: Lionel VITTE <lionel.vitte@st.com>
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Date: Fri, 8 Nov 2019 16:52:40 +0100
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Subject: [PATCH 09/31] ARM stm32mp1 r3 HWSPINLOCK
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---
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drivers/hwspinlock/Kconfig | 9 ++
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drivers/hwspinlock/Makefile | 1 +
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drivers/hwspinlock/hwspinlock_core.c | 15 ++--
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drivers/hwspinlock/stm32_hwspinlock.c | 164 ++++++++++++++++++++++++++++++++++
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4 files changed, 182 insertions(+), 7 deletions(-)
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create mode 100644 drivers/hwspinlock/stm32_hwspinlock.c
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diff --git a/drivers/hwspinlock/Kconfig b/drivers/hwspinlock/Kconfig
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index e895d29..7869c67 100644
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--- a/drivers/hwspinlock/Kconfig
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+++ b/drivers/hwspinlock/Kconfig
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@@ -49,6 +49,15 @@ config HWSPINLOCK_SPRD
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If unsure, say N.
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+config HWSPINLOCK_STM32
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+ tristate "STM32 Hardware Spinlock device"
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+ depends on MACH_STM32MP157
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+ depends on HWSPINLOCK
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+ help
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+ Say y here to support the STM32 Hardware Spinlock device.
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+
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+ If unsure, say N.
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+
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config HSEM_U8500
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tristate "STE Hardware Semaphore functionality"
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depends on HWSPINLOCK
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diff --git a/drivers/hwspinlock/Makefile b/drivers/hwspinlock/Makefile
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index b87c01a..ed053e3 100644
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--- a/drivers/hwspinlock/Makefile
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+++ b/drivers/hwspinlock/Makefile
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@@ -8,4 +8,5 @@ obj-$(CONFIG_HWSPINLOCK_OMAP) += omap_hwspinlock.o
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obj-$(CONFIG_HWSPINLOCK_QCOM) += qcom_hwspinlock.o
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obj-$(CONFIG_HWSPINLOCK_SIRF) += sirf_hwspinlock.o
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obj-$(CONFIG_HWSPINLOCK_SPRD) += sprd_hwspinlock.o
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+obj-$(CONFIG_HWSPINLOCK_STM32) += stm32_hwspinlock.o
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obj-$(CONFIG_HSEM_U8500) += u8500_hsem.o
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diff --git a/drivers/hwspinlock/hwspinlock_core.c b/drivers/hwspinlock/hwspinlock_core.c
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index 2bad40d..287e1b3 100644
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--- a/drivers/hwspinlock/hwspinlock_core.c
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+++ b/drivers/hwspinlock/hwspinlock_core.c
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@@ -333,6 +333,9 @@ int of_hwspin_lock_get_id(struct device_node *np, int index)
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if (ret)
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return ret;
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+ if (!of_device_is_available(args.np))
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+ return -ENOENT;
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+
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/* Find the hwspinlock device: we need its base_id */
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ret = -EPROBE_DEFER;
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rcu_read_lock();
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@@ -742,13 +745,11 @@ struct hwspinlock *hwspin_lock_request_specific(unsigned int id)
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/* sanity check (this shouldn't happen) */
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WARN_ON(hwlock_to_id(hwlock) != id);
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- /* make sure this hwspinlock is unused */
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- ret = radix_tree_tag_get(&hwspinlock_tree, id, HWSPINLOCK_UNUSED);
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- if (ret == 0) {
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- pr_warn("hwspinlock %u is already in use\n", id);
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- hwlock = NULL;
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- goto out;
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- }
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+ /*
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+ * We intentionally do not check for the HWSPINLOCK_UNUSED tag as
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+ * we want to share HWSPINLOCK between several devices. This is safe
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+ * since the lock/unlock requests are called under &hwlock->lock control
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+ */
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/* mark as used and power up */
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ret = __hwspin_lock_request(hwlock);
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diff --git a/drivers/hwspinlock/stm32_hwspinlock.c b/drivers/hwspinlock/stm32_hwspinlock.c
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new file mode 100644
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index 0000000..b9b9b99
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--- /dev/null
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+++ b/drivers/hwspinlock/stm32_hwspinlock.c
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@@ -0,0 +1,164 @@
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+// SPDX-License-Identifier: GPL-2.0
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+/*
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+ * Copyright (C) STMicroelectronics SA 2018
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+ * Author: Benjamin Gaignard <benjamin.gaignard@st.com> for STMicroelectronics.
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+ */
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+
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+#include <linux/clk.h>
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+#include <linux/delay.h>
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+#include <linux/hwspinlock.h>
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+#include <linux/io.h>
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+#include <linux/kernel.h>
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+#include <linux/module.h>
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+#include <linux/of.h>
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+#include <linux/platform_device.h>
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+#include <linux/pm_runtime.h>
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+
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+#include "hwspinlock_internal.h"
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+
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+#define STM32_MUTEX_COREID BIT(8)
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+#define STM32_MUTEX_LOCK_BIT BIT(31)
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+#define STM32_MUTEX_NUM_LOCKS 32
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+
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+struct stm32_hwspinlock {
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+ struct clk *clk;
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+ struct hwspinlock_device bank;
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+};
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+
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+static int stm32_hwspinlock_trylock(struct hwspinlock *lock)
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+{
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+ void __iomem *lock_addr = lock->priv;
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+ u32 status;
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+
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+ writel(STM32_MUTEX_LOCK_BIT | STM32_MUTEX_COREID, lock_addr);
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+ status = readl(lock_addr);
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+
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+ return status == (STM32_MUTEX_LOCK_BIT | STM32_MUTEX_COREID);
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+}
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+
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+static void stm32_hwspinlock_unlock(struct hwspinlock *lock)
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+{
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+ void __iomem *lock_addr = lock->priv;
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+
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+ writel(STM32_MUTEX_COREID, lock_addr);
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+}
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+
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+static void stm32_hwspinlock_relax(struct hwspinlock *lock)
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+{
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+ ndelay(50);
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+}
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+
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+static const struct hwspinlock_ops stm32_hwspinlock_ops = {
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+ .trylock = stm32_hwspinlock_trylock,
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+ .unlock = stm32_hwspinlock_unlock,
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+ .relax = stm32_hwspinlock_relax,
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+};
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+
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+static int stm32_hwspinlock_probe(struct platform_device *pdev)
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+{
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+ struct stm32_hwspinlock *hw;
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+ void __iomem *io_base;
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+ struct resource *res;
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+ size_t array_size;
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+ int i, ret;
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+
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+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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+ io_base = devm_ioremap_resource(&pdev->dev, res);
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+ if (!io_base)
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+ return -ENOMEM;
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+
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+ array_size = STM32_MUTEX_NUM_LOCKS * sizeof(struct hwspinlock);
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+ hw = devm_kzalloc(&pdev->dev, sizeof(*hw) + array_size, GFP_KERNEL);
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+ if (!hw)
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+ return -ENOMEM;
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+
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+ hw->clk = devm_clk_get(&pdev->dev, "hsem");
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+ if (IS_ERR(hw->clk))
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+ return PTR_ERR(hw->clk);
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+
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+ for (i = 0; i < STM32_MUTEX_NUM_LOCKS; i++)
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+ hw->bank.lock[i].priv = io_base + i * sizeof(u32);
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+
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+ platform_set_drvdata(pdev, hw);
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+ pm_runtime_enable(&pdev->dev);
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+
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+ ret = hwspin_lock_register(&hw->bank, &pdev->dev, &stm32_hwspinlock_ops,
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+ 0, STM32_MUTEX_NUM_LOCKS);
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+
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+ if (ret)
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+ pm_runtime_disable(&pdev->dev);
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+
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+ return ret;
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+}
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+
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+static int stm32_hwspinlock_remove(struct platform_device *pdev)
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+{
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+ struct stm32_hwspinlock *hw = platform_get_drvdata(pdev);
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+ int ret;
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+
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+ ret = hwspin_lock_unregister(&hw->bank);
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+ if (ret)
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+ dev_err(&pdev->dev, "%s failed: %d\n", __func__, ret);
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+
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+ pm_runtime_disable(&pdev->dev);
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+
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+ return 0;
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+}
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+
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+static int __maybe_unused stm32_hwspinlock_runtime_suspend(struct device *dev)
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+{
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+ struct stm32_hwspinlock *hw = dev_get_drvdata(dev);
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+
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+ clk_disable_unprepare(hw->clk);
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+
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+ return 0;
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+}
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+
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+static int __maybe_unused stm32_hwspinlock_runtime_resume(struct device *dev)
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+{
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+ struct stm32_hwspinlock *hw = dev_get_drvdata(dev);
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+
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+ clk_prepare_enable(hw->clk);
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+
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+ return 0;
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+}
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+
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+static const struct dev_pm_ops stm32_hwspinlock_pm_ops = {
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+ SET_RUNTIME_PM_OPS(stm32_hwspinlock_runtime_suspend,
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+ stm32_hwspinlock_runtime_resume,
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+ NULL)
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+};
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+
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+static const struct of_device_id stm32_hwpinlock_ids[] = {
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+ { .compatible = "st,stm32-hwspinlock", },
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+ {},
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+};
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+MODULE_DEVICE_TABLE(of, stm32_hwpinlock_ids);
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+
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+static struct platform_driver stm32_hwspinlock_driver = {
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+ .probe = stm32_hwspinlock_probe,
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+ .remove = stm32_hwspinlock_remove,
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+ .driver = {
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+ .name = "stm32_hwspinlock",
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+ .of_match_table = stm32_hwpinlock_ids,
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+ .pm = &stm32_hwspinlock_pm_ops,
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+ },
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+};
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+
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+static int __init stm32_hwspinlock_init(void)
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+{
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+ return platform_driver_register(&stm32_hwspinlock_driver);
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+}
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+
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+/* board init code might need to reserve hwspinlocks for predefined purposes */
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+postcore_initcall(stm32_hwspinlock_init);
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+
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+static void __exit stm32_hwspinlock_exit(void)
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+{
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+ platform_driver_unregister(&stm32_hwspinlock_driver);
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+}
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+module_exit(stm32_hwspinlock_exit);
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+
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+MODULE_LICENSE("GPL v2");
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+MODULE_DESCRIPTION("Hardware spinlock driver for STM32 SoCs");
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+MODULE_AUTHOR("Benjamin Gaignard <benjamin.gaignard@st.com>");
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--
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2.7.4
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