mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-25 16:30:53 +07:00
ed0611a604
Use devm_hwspin_lock_register() to register the hwlock controller instead of unregistering the hwlock controller explicitly when removing the device. Signed-off-by: Baolin Wang <baolin.wang7@gmail.com> Link: https://lore.kernel.org/r/d69ad8611a68b0cac3c927d19901f3c113c5435c.1578452735.git.baolin.wang7@gmail.com Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
151 lines
3.6 KiB
C
151 lines
3.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Copyright (c) 2013, The Linux Foundation. All rights reserved.
|
|
* Copyright (c) 2015, Sony Mobile Communications AB
|
|
*/
|
|
|
|
#include <linux/hwspinlock.h>
|
|
#include <linux/io.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/mfd/syscon.h>
|
|
#include <linux/module.h>
|
|
#include <linux/of.h>
|
|
#include <linux/of_device.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/regmap.h>
|
|
|
|
#include "hwspinlock_internal.h"
|
|
|
|
#define QCOM_MUTEX_APPS_PROC_ID 1
|
|
#define QCOM_MUTEX_NUM_LOCKS 32
|
|
|
|
static int qcom_hwspinlock_trylock(struct hwspinlock *lock)
|
|
{
|
|
struct regmap_field *field = lock->priv;
|
|
u32 lock_owner;
|
|
int ret;
|
|
|
|
ret = regmap_field_write(field, QCOM_MUTEX_APPS_PROC_ID);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = regmap_field_read(field, &lock_owner);
|
|
if (ret)
|
|
return ret;
|
|
|
|
return lock_owner == QCOM_MUTEX_APPS_PROC_ID;
|
|
}
|
|
|
|
static void qcom_hwspinlock_unlock(struct hwspinlock *lock)
|
|
{
|
|
struct regmap_field *field = lock->priv;
|
|
u32 lock_owner;
|
|
int ret;
|
|
|
|
ret = regmap_field_read(field, &lock_owner);
|
|
if (ret) {
|
|
pr_err("%s: unable to query spinlock owner\n", __func__);
|
|
return;
|
|
}
|
|
|
|
if (lock_owner != QCOM_MUTEX_APPS_PROC_ID) {
|
|
pr_err("%s: spinlock not owned by us (actual owner is %d)\n",
|
|
__func__, lock_owner);
|
|
}
|
|
|
|
ret = regmap_field_write(field, 0);
|
|
if (ret)
|
|
pr_err("%s: failed to unlock spinlock\n", __func__);
|
|
}
|
|
|
|
static const struct hwspinlock_ops qcom_hwspinlock_ops = {
|
|
.trylock = qcom_hwspinlock_trylock,
|
|
.unlock = qcom_hwspinlock_unlock,
|
|
};
|
|
|
|
static const struct of_device_id qcom_hwspinlock_of_match[] = {
|
|
{ .compatible = "qcom,sfpb-mutex" },
|
|
{ .compatible = "qcom,tcsr-mutex" },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(of, qcom_hwspinlock_of_match);
|
|
|
|
static int qcom_hwspinlock_probe(struct platform_device *pdev)
|
|
{
|
|
struct hwspinlock_device *bank;
|
|
struct device_node *syscon;
|
|
struct reg_field field;
|
|
struct regmap *regmap;
|
|
size_t array_size;
|
|
u32 stride;
|
|
u32 base;
|
|
int ret;
|
|
int i;
|
|
|
|
syscon = of_parse_phandle(pdev->dev.of_node, "syscon", 0);
|
|
if (!syscon) {
|
|
dev_err(&pdev->dev, "no syscon property\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
regmap = syscon_node_to_regmap(syscon);
|
|
of_node_put(syscon);
|
|
if (IS_ERR(regmap))
|
|
return PTR_ERR(regmap);
|
|
|
|
ret = of_property_read_u32_index(pdev->dev.of_node, "syscon", 1, &base);
|
|
if (ret < 0) {
|
|
dev_err(&pdev->dev, "no offset in syscon\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
ret = of_property_read_u32_index(pdev->dev.of_node, "syscon", 2, &stride);
|
|
if (ret < 0) {
|
|
dev_err(&pdev->dev, "no stride syscon\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
array_size = QCOM_MUTEX_NUM_LOCKS * sizeof(struct hwspinlock);
|
|
bank = devm_kzalloc(&pdev->dev, sizeof(*bank) + array_size, GFP_KERNEL);
|
|
if (!bank)
|
|
return -ENOMEM;
|
|
|
|
platform_set_drvdata(pdev, bank);
|
|
|
|
for (i = 0; i < QCOM_MUTEX_NUM_LOCKS; i++) {
|
|
field.reg = base + i * stride;
|
|
field.lsb = 0;
|
|
field.msb = 31;
|
|
|
|
bank->lock[i].priv = devm_regmap_field_alloc(&pdev->dev,
|
|
regmap, field);
|
|
}
|
|
|
|
return devm_hwspin_lock_register(&pdev->dev, bank, &qcom_hwspinlock_ops,
|
|
0, QCOM_MUTEX_NUM_LOCKS);
|
|
}
|
|
|
|
static struct platform_driver qcom_hwspinlock_driver = {
|
|
.probe = qcom_hwspinlock_probe,
|
|
.driver = {
|
|
.name = "qcom_hwspinlock",
|
|
.of_match_table = qcom_hwspinlock_of_match,
|
|
},
|
|
};
|
|
|
|
static int __init qcom_hwspinlock_init(void)
|
|
{
|
|
return platform_driver_register(&qcom_hwspinlock_driver);
|
|
}
|
|
/* board init code might need to reserve hwspinlocks for predefined purposes */
|
|
postcore_initcall(qcom_hwspinlock_init);
|
|
|
|
static void __exit qcom_hwspinlock_exit(void)
|
|
{
|
|
platform_driver_unregister(&qcom_hwspinlock_driver);
|
|
}
|
|
module_exit(qcom_hwspinlock_exit);
|
|
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_DESCRIPTION("Hardware spinlock driver for Qualcomm SoCs");
|