159 lines
4.1 KiB
C
159 lines
4.1 KiB
C
// 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 = 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>");
|