hwspinlock: sprd: Add hardware spinlock driver (d8c8bbbb) · Commits · e / devices / android_kernel_oneplus_sm7250

drivers/hwspinlock/Kconfig

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Original line number	Diff line number	Diff line
		@@ -39,6 +39,15 @@ config HWSPINLOCK_SIRF
		It's safe to say n here if you're not interested in SIRF hardware
		spinlock or just want a bare minimum kernel.

		config HWSPINLOCK_SPRD
		tristate "SPRD Hardware Spinlock device"
		depends on ARCH_SPRD
		depends on HWSPINLOCK
		help
		Say y here to support the SPRD Hardware Spinlock device.

		If unsure, say N.

		config HSEM_U8500
		tristate "STE Hardware Semaphore functionality"
		depends on HWSPINLOCK

drivers/hwspinlock/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -6,4 +6,5 @@ obj-$(CONFIG_HWSPINLOCK) += hwspinlock_core.o
		obj-$(CONFIG_HWSPINLOCK_OMAP) += omap_hwspinlock.o
		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

drivers/hwspinlock/sprd_hwspinlock.c

0 → 100644

+183 −0

Original line number	Diff line number	Diff line
		/*
		* Spreadtrum hardware spinlock driver
		* Copyright (C) 2017 Spreadtrum - http://www.spreadtrum.com
		*
		* This program is free software; you can redistribute it and/or
		* modify it under the terms of the GNU General Public License
		* version 2 as published by the Free Software Foundation.
		*
		* This program is distributed in the hope that it will be useful, but
		* WITHOUT ANY WARRANTY; without even the implied warranty of
		* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
		* General Public License for more details.
		*/

		#include <linux/bitops.h>
		#include <linux/clk.h>
		#include <linux/delay.h>
		#include <linux/device.h>
		#include <linux/hwspinlock.h>
		#include <linux/io.h>
		#include <linux/kernel.h>
		#include <linux/module.h>
		#include <linux/of.h>
		#include <linux/of_device.h>
		#include <linux/platform_device.h>
		#include <linux/pm_runtime.h>
		#include <linux/slab.h>

		#include "hwspinlock_internal.h"

		/* hwspinlock registers definition */
		#define HWSPINLOCK_RECCTRL 0x4
		#define HWSPINLOCK_MASTERID(_X_) (0x80 + 0x4 * (_X_))
		#define HWSPINLOCK_TOKEN(_X_) (0x800 + 0x4 * (_X_))

		/* unlocked value */
		#define HWSPINLOCK_NOTTAKEN 0x55aa10c5
		/* bits definition of RECCTRL reg */
		#define HWSPINLOCK_USER_BITS 0x1

		/* hwspinlock number */
		#define SPRD_HWLOCKS_NUM 32

		struct sprd_hwspinlock_dev {
		void __iomem *base;
		struct clk *clk;
		struct hwspinlock_device bank;
		};

		/* try to lock the hardware spinlock */
		static int sprd_hwspinlock_trylock(struct hwspinlock *lock)
		{
		struct sprd_hwspinlock_dev *sprd_hwlock =
		dev_get_drvdata(lock->bank->dev);
		void __iomem *addr = lock->priv;
		int user_id, lock_id;

		if (!readl(addr))
		return 1;

		lock_id = hwlock_to_id(lock);
		/* get the hardware spinlock master/user id */
		user_id = readl(sprd_hwlock->base + HWSPINLOCK_MASTERID(lock_id));
		dev_warn(sprd_hwlock->bank.dev,
		"hwspinlock [%d] lock failed and master/user id = %d!\n",
		lock_id, user_id);
		return 0;
		}

		/* unlock the hardware spinlock */
		static void sprd_hwspinlock_unlock(struct hwspinlock *lock)
		{
		void __iomem *lock_addr = lock->priv;

		writel(HWSPINLOCK_NOTTAKEN, lock_addr);
		}

		/* The specs recommended below number as the retry delay time */
		static void sprd_hwspinlock_relax(struct hwspinlock *lock)
		{
		ndelay(10);
		}

		static const struct hwspinlock_ops sprd_hwspinlock_ops = {
		.trylock = sprd_hwspinlock_trylock,
		.unlock = sprd_hwspinlock_unlock,
		.relax = sprd_hwspinlock_relax,
		};

		static int sprd_hwspinlock_probe(struct platform_device *pdev)
		{
		struct sprd_hwspinlock_dev *sprd_hwlock;
		struct hwspinlock *lock;
		struct resource *res;
		int i, ret;

		if (!pdev->dev.of_node)
		return -ENODEV;

		sprd_hwlock = devm_kzalloc(&pdev->dev,
		sizeof(struct sprd_hwspinlock_dev) +
		SPRD_HWLOCKS_NUM * sizeof(*lock),
		GFP_KERNEL);
		if (!sprd_hwlock)
		return -ENOMEM;

		res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
		sprd_hwlock->base = devm_ioremap_resource(&pdev->dev, res);
		if (IS_ERR(sprd_hwlock->base))
		return PTR_ERR(sprd_hwlock->base);

		sprd_hwlock->clk = devm_clk_get(&pdev->dev, "enable");
		if (IS_ERR(sprd_hwlock->clk)) {
		dev_err(&pdev->dev, "get hwspinlock clock failed!\n");
		return PTR_ERR(sprd_hwlock->clk);
		}

		clk_prepare_enable(sprd_hwlock->clk);

		/* set the hwspinlock to record user id to identify subsystems */
		writel(HWSPINLOCK_USER_BITS, sprd_hwlock->base + HWSPINLOCK_RECCTRL);

		for (i = 0; i < SPRD_HWLOCKS_NUM; i++) {
		lock = &sprd_hwlock->bank.lock[i];
		lock->priv = sprd_hwlock->base + HWSPINLOCK_TOKEN(i);
		}

		platform_set_drvdata(pdev, sprd_hwlock);
		pm_runtime_enable(&pdev->dev);

		ret = hwspin_lock_register(&sprd_hwlock->bank, &pdev->dev,
		&sprd_hwspinlock_ops, 0, SPRD_HWLOCKS_NUM);
		if (ret) {
		pm_runtime_disable(&pdev->dev);
		clk_disable_unprepare(sprd_hwlock->clk);
		return ret;
		}

		return 0;
		}

		static int sprd_hwspinlock_remove(struct platform_device *pdev)
		{
		struct sprd_hwspinlock_dev *sprd_hwlock = platform_get_drvdata(pdev);

		hwspin_lock_unregister(&sprd_hwlock->bank);
		pm_runtime_disable(&pdev->dev);
		clk_disable_unprepare(sprd_hwlock->clk);
		return 0;
		}

		static const struct of_device_id sprd_hwspinlock_of_match[] = {
		{ .compatible = "sprd,hwspinlock-r3p0", },
		{ /* sentinel */ }
		};
		MODULE_DEVICE_TABLE(of, sprd_hwspinlock_of_match);

		static struct platform_driver sprd_hwspinlock_driver = {
		.probe = sprd_hwspinlock_probe,
		.remove = sprd_hwspinlock_remove,
		.driver = {
		.name = "sprd_hwspinlock",
		.of_match_table = of_match_ptr(sprd_hwspinlock_of_match),
		},
		};

		static int __init sprd_hwspinlock_init(void)
		{
		return platform_driver_register(&sprd_hwspinlock_driver);
		}
		postcore_initcall(sprd_hwspinlock_init);

		static void __exit sprd_hwspinlock_exit(void)
		{
		platform_driver_unregister(&sprd_hwspinlock_driver);
		}
		module_exit(sprd_hwspinlock_exit);

		MODULE_LICENSE("GPL v2");
		MODULE_DESCRIPTION("Hardware spinlock driver for Spreadtrum");
		MODULE_AUTHOR("Baolin Wang <baolin.wang@spreadtrum.com>");
		MODULE_AUTHOR("Lanqing Liu <lanqing.liu@spreadtrum.com>");
		MODULE_AUTHOR("Long Cheng <aiden.cheng@spreadtrum.com>");