// SPDX-License-Identifier: GPL-2.0
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// Copyright (c) 2018 Fuzhou Rockchip Electronics Co., Ltd
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/device.h>
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#include <linux/io.h>
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#include <linux/pm_runtime.h>
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include <linux/hwspinlock.h>
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#include <linux/platform_device.h>
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#include <linux/of.h>
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#include <linux/of_address.h>
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#include "hwspinlock_internal.h"
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struct rockchip_hwspinlock {
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void __iomem *io_base;
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struct hwspinlock_device bank;
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};
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/* Number of Hardware Spinlocks*/
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#define HWSPINLOCK_NUMBER 64
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/* Hardware spinlock register offsets */
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#define HWSPINLOCK_OFFSET(x) (0x4 * (x))
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#define HWSPINLOCK_OWNER_ID 0x01
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static int rockchip_hwspinlock_trylock(struct hwspinlock *lock)
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{
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void __iomem *lock_addr = lock->priv;
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writel(HWSPINLOCK_OWNER_ID, lock_addr);
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/*
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* Get only first 4 bits and compare to HWSPINLOCK_OWNER_ID,
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* if equal, we attempt to acquire the lock, otherwise,
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* someone else has it.
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*/
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return (HWSPINLOCK_OWNER_ID == (0x0F & readl(lock_addr)));
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}
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static void rockchip_hwspinlock_unlock(struct hwspinlock *lock)
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{
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void __iomem *lock_addr = lock->priv;
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/* Release the lock by writing 0 to it */
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writel(0, lock_addr);
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}
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static const struct hwspinlock_ops rockchip_hwspinlock_ops = {
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.trylock = rockchip_hwspinlock_trylock,
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.unlock = rockchip_hwspinlock_unlock,
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};
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static int rockchip_hwspinlock_probe(struct platform_device *pdev)
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{
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struct rockchip_hwspinlock *hwspin;
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struct hwspinlock *hwlock;
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struct resource *res;
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int idx, ret;
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if (!pdev->dev.of_node)
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return -ENODEV;
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hwspin = devm_kzalloc(&pdev->dev, sizeof(*hwspin) +
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sizeof(*hwlock) * HWSPINLOCK_NUMBER, GFP_KERNEL);
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if (!hwspin)
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return -ENOMEM;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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hwspin->io_base = devm_ioremap_resource(&pdev->dev, res);
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if (IS_ERR(hwspin->io_base))
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return PTR_ERR(hwspin->io_base);
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for (idx = 0; idx < HWSPINLOCK_NUMBER; idx++) {
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hwlock = &hwspin->bank.lock[idx];
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hwlock->priv = hwspin->io_base + HWSPINLOCK_OFFSET(idx);
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}
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platform_set_drvdata(pdev, hwspin);
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pm_runtime_enable(&pdev->dev);
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ret = hwspin_lock_register(&hwspin->bank, &pdev->dev,
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&rockchip_hwspinlock_ops, 0,
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HWSPINLOCK_NUMBER);
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if (ret)
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goto reg_fail;
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return 0;
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reg_fail:
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pm_runtime_disable(&pdev->dev);
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iounmap(hwspin->io_base);
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return ret;
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}
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static int rockchip_hwspinlock_remove(struct platform_device *pdev)
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{
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struct rockchip_hwspinlock *hwspin = platform_get_drvdata(pdev);
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int ret;
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ret = hwspin_lock_unregister(&hwspin->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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return ret;
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}
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pm_runtime_disable(&pdev->dev);
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iounmap(hwspin->io_base);
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return 0;
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}
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static const struct of_device_id rockchip_hwpinlock_ids[] = {
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{ .compatible = "rockchip,hwspinlock", },
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{},
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};
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MODULE_DEVICE_TABLE(of, rockchip_hwpinlock_ids);
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static struct platform_driver rockchip_hwspinlock_driver = {
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.probe = rockchip_hwspinlock_probe,
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.remove = rockchip_hwspinlock_remove,
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.driver = {
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.name = "rockchip_hwspinlock",
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.of_match_table = of_match_ptr(rockchip_hwpinlock_ids),
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},
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};
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static int __init rockchip_hwspinlock_init(void)
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{
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return platform_driver_register(&rockchip_hwspinlock_driver);
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}
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postcore_initcall(rockchip_hwspinlock_init);
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static void __exit rockchip_hwspinlock_exit(void)
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{
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platform_driver_unregister(&rockchip_hwspinlock_driver);
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}
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module_exit(rockchip_hwspinlock_exit);
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MODULE_LICENSE("GPL v2");
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MODULE_DESCRIPTION("Rockchip Hardware spinlock driver");
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MODULE_AUTHOR("Frank Wang <frank.wang@rock-chips.com>");
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