Commit cc16d664 authored by Wei Chen's avatar Wei Chen Committed by Ohad Ben-Cohen

hwspinlock: add a CSR atlas7 driver

Add hwspinlock support for the CSR atlas7 SoC.

The Hardware Spinlock device on atlas7 provides hardware assistance
for synchronization between the multiple processors in the system
(dual Cortex-A7, CAN bus Cortex-M3 and audio DSP).
Reviewed-by: 's avatarSuman Anna <s-anna@ti.com>
Reviewed-by: 's avatarBjorn Andersson <bjorn.andersson@sonymobile.com>
Signed-off-by: 's avatarWei Chen <wei.chen@csr.com>
Signed-off-by: 's avatarBarry Song <Baohua.Song@csr.com>
Signed-off-by: 's avatarOhad Ben-Cohen <ohad@wizery.com>
parent 19a0f612
......@@ -30,6 +30,18 @@ config HWSPINLOCK_QCOM
If unsure, say N.
config HWSPINLOCK_SIRF
tristate "SIRF Hardware Spinlock device"
depends on ARCH_SIRF
select HWSPINLOCK
help
Say y here to support the SIRF Hardware Spinlock device, which
provides a synchronisation mechanism for the various processors
on the SoC.
It's safe to say n here if you're not interested in SIRF hardware
spinlock or just want a bare minimum kernel.
config HSEM_U8500
tristate "STE Hardware Semaphore functionality"
depends on ARCH_U8500
......
......@@ -5,4 +5,5 @@
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_HSEM_U8500) += u8500_hsem.o
/*
* SIRF hardware spinlock driver
*
* Copyright (c) 2015 Cambridge Silicon Radio Limited, a CSR plc group company.
*
* Licensed under GPLv2.
*/
#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, sizeof(*hwspin) +
sizeof(*hwlock) * 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>");
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