mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-22 04:03:58 +08:00
6f75edeadd
In addition to migrating the files to use SPDX license headers this introduces the ability for clients to operate a hwlock without the framework taking any additional locks. -----BEGIN PGP SIGNATURE----- iQJPBAABCAA5FiEEBd4DzF816k8JZtUlCx85Pw2ZrcUFAlsevMIbHGJqb3JuLmFu ZGVyc3NvbkBsaW5hcm8ub3JnAAoJEAsfOT8Nma3FqjgQAKWiDEoEw75RZnfmRAVB Ot8TgeUoj6CodjV0pe3fLYBYLKzJbEBiC8VfjFKeq9JwndPsGaCXqcnrKegl11pd /supYYzsAWT4YUZFsq0Y00mnNWKHLVL2VkKh4yPD+GaRuBDITKaurBnv3tB19ccG aeG5eS2bIhMhcaRaPVSRYlb34Zz8PssvlYefToUiNCuBI33D45fRSvvn5z3o5xAh ZL0qEBVG8BviPIPMwlp5w1PIC8Rz+eyZRmaH+fV5lewUqh32hzf4ynAIr0aDYug7 tzFeSPqjxpvzRgZtocsJ2NqTm3jMEyzHL9X+Rt31ryN4flTROkCiWg4xDONvac7E fAq924WhvYqe2flNJjUR6azxjO0RsTx78LiAxZir43tvSjqdm3RTPgWOlCTdzP4u O5lDAm7c1QZISlKAXJewRccuUxg2XVdYa2tTBQalBqq9Ys1ZiMeWQ4UUNzvEIBji vlj2KguG5CgPrThhk/S11JCvG7Ti5frljebVasyF5nLX78bXPfTaBpPNre+kL6Ee 4AylueOFeT5+Ft8a7quokzvBGUmlwYPq6jPAAL4TrU39SLIWxXRv3qDczBRe0j9G Xh6L8GVrUIEWxJz04OxtsgG/N3zNujjUTy/G3A3AZgM7Ijneu0xNKAjXNHfD2XNu pH2+HeF8vKQNB89gZJkF90XW =KYHF -----END PGP SIGNATURE----- Merge tag 'hwlock-v4.18' of git://github.com/andersson/remoteproc Pull hwspinlock updates from Bjorn Andersson: "In addition to migrating the files to use SPDX license headers this introduces the ability for clients to operate a hwlock without the framework taking any additional locks" * tag 'hwlock-v4.18' of git://github.com/andersson/remoteproc: hwspinlock/u8500: Switch to SPDX license identifier hwspinlock: sprd: Switch to SPDX license identifier hwspinlock/sirf: Switch to SPDX license identifier hwspinlock: qcom: Switch to SPDX license identifier hwspinlock/omap: Switch to SPDX license identifier hwspinlock/core: Switch to SPDX license identifier hwspinlock: Introduce one new mode for hwspinlock hwspinlock: Convert to use 'switch' statement
138 lines
3.0 KiB
C
138 lines
3.0 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* SIRF hardware spinlock driver
|
|
*
|
|
* Copyright (c) 2015 Cambridge Silicon Radio Limited, a CSR plc group company.
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/device.h>
|
|
#include <linux/io.h>
|
|
#include <linux/pm_runtime.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/spinlock.h>
|
|
#include <linux/hwspinlock.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/of.h>
|
|
#include <linux/of_address.h>
|
|
|
|
#include "hwspinlock_internal.h"
|
|
|
|
struct sirf_hwspinlock {
|
|
void __iomem *io_base;
|
|
struct hwspinlock_device bank;
|
|
};
|
|
|
|
/* Number of Hardware Spinlocks*/
|
|
#define HW_SPINLOCK_NUMBER 30
|
|
|
|
/* Hardware spinlock register offsets */
|
|
#define HW_SPINLOCK_BASE 0x404
|
|
#define HW_SPINLOCK_OFFSET(x) (HW_SPINLOCK_BASE + 0x4 * (x))
|
|
|
|
static int sirf_hwspinlock_trylock(struct hwspinlock *lock)
|
|
{
|
|
void __iomem *lock_addr = lock->priv;
|
|
|
|
/* attempt to acquire the lock by reading value == 1 from it */
|
|
return !!readl(lock_addr);
|
|
}
|
|
|
|
static void sirf_hwspinlock_unlock(struct hwspinlock *lock)
|
|
{
|
|
void __iomem *lock_addr = lock->priv;
|
|
|
|
/* release the lock by writing 0 to it */
|
|
writel(0, lock_addr);
|
|
}
|
|
|
|
static const struct hwspinlock_ops sirf_hwspinlock_ops = {
|
|
.trylock = sirf_hwspinlock_trylock,
|
|
.unlock = sirf_hwspinlock_unlock,
|
|
};
|
|
|
|
static int sirf_hwspinlock_probe(struct platform_device *pdev)
|
|
{
|
|
struct sirf_hwspinlock *hwspin;
|
|
struct hwspinlock *hwlock;
|
|
int idx, ret;
|
|
|
|
if (!pdev->dev.of_node)
|
|
return -ENODEV;
|
|
|
|
hwspin = devm_kzalloc(&pdev->dev,
|
|
struct_size(hwspin, bank.lock,
|
|
HW_SPINLOCK_NUMBER),
|
|
GFP_KERNEL);
|
|
if (!hwspin)
|
|
return -ENOMEM;
|
|
|
|
/* retrieve io base */
|
|
hwspin->io_base = of_iomap(pdev->dev.of_node, 0);
|
|
if (!hwspin->io_base)
|
|
return -ENOMEM;
|
|
|
|
for (idx = 0; idx < HW_SPINLOCK_NUMBER; idx++) {
|
|
hwlock = &hwspin->bank.lock[idx];
|
|
hwlock->priv = hwspin->io_base + HW_SPINLOCK_OFFSET(idx);
|
|
}
|
|
|
|
platform_set_drvdata(pdev, hwspin);
|
|
|
|
pm_runtime_enable(&pdev->dev);
|
|
|
|
ret = hwspin_lock_register(&hwspin->bank, &pdev->dev,
|
|
&sirf_hwspinlock_ops, 0,
|
|
HW_SPINLOCK_NUMBER);
|
|
if (ret)
|
|
goto reg_failed;
|
|
|
|
return 0;
|
|
|
|
reg_failed:
|
|
pm_runtime_disable(&pdev->dev);
|
|
iounmap(hwspin->io_base);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int sirf_hwspinlock_remove(struct platform_device *pdev)
|
|
{
|
|
struct sirf_hwspinlock *hwspin = platform_get_drvdata(pdev);
|
|
int ret;
|
|
|
|
ret = hwspin_lock_unregister(&hwspin->bank);
|
|
if (ret) {
|
|
dev_err(&pdev->dev, "%s failed: %d\n", __func__, ret);
|
|
return ret;
|
|
}
|
|
|
|
pm_runtime_disable(&pdev->dev);
|
|
|
|
iounmap(hwspin->io_base);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct of_device_id sirf_hwpinlock_ids[] = {
|
|
{ .compatible = "sirf,hwspinlock", },
|
|
{},
|
|
};
|
|
MODULE_DEVICE_TABLE(of, sirf_hwpinlock_ids);
|
|
|
|
static struct platform_driver sirf_hwspinlock_driver = {
|
|
.probe = sirf_hwspinlock_probe,
|
|
.remove = sirf_hwspinlock_remove,
|
|
.driver = {
|
|
.name = "atlas7_hwspinlock",
|
|
.of_match_table = of_match_ptr(sirf_hwpinlock_ids),
|
|
},
|
|
};
|
|
|
|
module_platform_driver(sirf_hwspinlock_driver);
|
|
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_DESCRIPTION("SIRF Hardware spinlock driver");
|
|
MODULE_AUTHOR("Wei Chen <wei.chen@csr.com>");
|