forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
158 lines
4.1 KiB
158 lines
4.1 KiB
// 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 <[email protected]>"); |
|
MODULE_AUTHOR("Lanqing Liu <[email protected]>"); |
|
MODULE_AUTHOR("Long Cheng <[email protected]>");
|
|
|