drivers/hwspinlock/stm32_hwspinlock.c

1 // SPDX-License-Identifier: GPL-2.0
9 #include <linux/hwspinlock.h>
28 static int stm32_hwspinlock_trylock(struct hwspinlock *lock)  in stm32_hwspinlock_trylock()
30 	void __iomem *lock_addr = lock->priv;  in stm32_hwspinlock_trylock()
39 static void stm32_hwspinlock_unlock(struct hwspinlock *lock)  in stm32_hwspinlock_unlock()
41 	void __iomem *lock_addr = lock->priv;  in stm32_hwspinlock_unlock()
46 static void stm32_hwspinlock_relax(struct hwspinlock *lock)  in stm32_hwspinlock_relax()
68 	array_size = STM32_MUTEX_NUM_LOCKS * sizeof(struct hwspinlock);  in stm32_hwspinlock_probe()
69 	hw = devm_kzalloc(&pdev->dev, sizeof(*hw) + array_size, GFP_KERNEL);  in stm32_hwspinlock_probe()
71 		return -ENOMEM;  in stm32_hwspinlock_probe()
73 	hw->clk = devm_clk_get(&pdev->dev, "hsem");  in stm32_hwspinlock_probe()
74 	if (IS_ERR(hw->clk))  in stm32_hwspinlock_probe()
75 		return PTR_ERR(hw->clk);  in stm32_hwspinlock_probe()
78 		hw->bank.lock[i].priv = io_base + i * sizeof(u32);  in stm32_hwspinlock_probe()
81 	pm_runtime_enable(&pdev->dev);  in stm32_hwspinlock_probe()
83 	ret = hwspin_lock_register(&hw->bank, &pdev->dev, &stm32_hwspinlock_ops,  in stm32_hwspinlock_probe()
87 		pm_runtime_disable(&pdev->dev);  in stm32_hwspinlock_probe()
97 	ret = hwspin_lock_unregister(&hw->bank);  in stm32_hwspinlock_remove()
99 		dev_err(&pdev->dev, "%s failed: %d\n", __func__, ret);  in stm32_hwspinlock_remove()
101 	pm_runtime_disable(&pdev->dev);  in stm32_hwspinlock_remove()
110 	clk_disable_unprepare(hw->clk);  in stm32_hwspinlock_runtime_suspend()
119 	clk_prepare_enable(hw->clk);  in stm32_hwspinlock_runtime_resume()
131 	{ .compatible = "st,stm32-hwspinlock", },
160 MODULE_DESCRIPTION("Hardware spinlock driver for STM32 SoCs");