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// SPDX-License-Identifier: GPL-2.0
/*
* Spreadtrum hardware spinlock driver
* Copyright (C) 2017 Spreadtrum - http://www.spreadtrum.com
*/
#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 "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 void sprd_hwspinlock_disable(void *data)
{
struct sprd_hwspinlock_dev *sprd_hwlock = data;
clk_disable_unprepare(sprd_hwlock->clk);
}
static int sprd_hwspinlock_probe(struct platform_device *pdev)
{
struct sprd_hwspinlock_dev *sprd_hwlock;
struct hwspinlock *lock;
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;
sprd_hwlock->base = devm_platform_ioremap_resource(pdev, 0);
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);
}
ret = clk_prepare_enable(sprd_hwlock->clk);
if (ret)
return ret;
ret = devm_add_action_or_reset(&pdev->dev, sprd_hwspinlock_disable,
sprd_hwlock);
if (ret) {
dev_err(&pdev->dev,
"Failed to add hwspinlock disable action\n");
return ret;
}
/* 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);
return devm_hwspin_lock_register(&pdev->dev, &sprd_hwlock->bank,
&sprd_hwspinlock_ops, 0,
SPRD_HWLOCKS_NUM);
}
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,
.driver = {
.name = "sprd_hwspinlock",
.of_match_table = of_match_ptr(sprd_hwspinlock_of_match),
},
};
module_platform_driver(sprd_hwspinlock_driver);
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>");
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