mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-14 08:57:58 +00:00
9119f547d3
Implement hardware spinlock support for STM32MP1. Signed-off-by: Benjamin Gaignard <benjamin.gaignard@st.com> Reviewed-by: Simon Glass <sjg@chromium.org> Reviewed-by: Patrice Chotard <patrice.chotard@st.com>
92 lines
2 KiB
C
92 lines
2 KiB
C
// SPDX-License-Identifier: GPL-2.0+ OR BSD-3-Clause
|
|
/*
|
|
* Copyright (C) 2018, STMicroelectronics - All Rights Reserved
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <clk.h>
|
|
#include <dm.h>
|
|
#include <hwspinlock.h>
|
|
#include <asm/io.h>
|
|
|
|
#define STM32_MUTEX_COREID BIT(8)
|
|
#define STM32_MUTEX_LOCK_BIT BIT(31)
|
|
#define STM32_MUTEX_NUM_LOCKS 32
|
|
|
|
struct stm32mp1_hws_priv {
|
|
fdt_addr_t base;
|
|
};
|
|
|
|
static int stm32mp1_lock(struct udevice *dev, int index)
|
|
{
|
|
struct stm32mp1_hws_priv *priv = dev_get_priv(dev);
|
|
u32 status;
|
|
|
|
if (index >= STM32_MUTEX_NUM_LOCKS)
|
|
return -EINVAL;
|
|
|
|
status = readl(priv->base + index * sizeof(u32));
|
|
if (status == (STM32_MUTEX_LOCK_BIT | STM32_MUTEX_COREID))
|
|
return -EBUSY;
|
|
|
|
writel(STM32_MUTEX_LOCK_BIT | STM32_MUTEX_COREID,
|
|
priv->base + index * sizeof(u32));
|
|
|
|
status = readl(priv->base + index * sizeof(u32));
|
|
if (status != (STM32_MUTEX_LOCK_BIT | STM32_MUTEX_COREID))
|
|
return -EINVAL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int stm32mp1_unlock(struct udevice *dev, int index)
|
|
{
|
|
struct stm32mp1_hws_priv *priv = dev_get_priv(dev);
|
|
|
|
if (index >= STM32_MUTEX_NUM_LOCKS)
|
|
return -EINVAL;
|
|
|
|
writel(STM32_MUTEX_COREID, priv->base + index * sizeof(u32));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int stm32mp1_hwspinlock_probe(struct udevice *dev)
|
|
{
|
|
struct stm32mp1_hws_priv *priv = dev_get_priv(dev);
|
|
struct clk clk;
|
|
int ret;
|
|
|
|
priv->base = dev_read_addr(dev);
|
|
if (priv->base == FDT_ADDR_T_NONE)
|
|
return -EINVAL;
|
|
|
|
ret = clk_get_by_index(dev, 0, &clk);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = clk_enable(&clk);
|
|
if (ret)
|
|
clk_free(&clk);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static const struct hwspinlock_ops stm32mp1_hwspinlock_ops = {
|
|
.lock = stm32mp1_lock,
|
|
.unlock = stm32mp1_unlock,
|
|
};
|
|
|
|
static const struct udevice_id stm32mp1_hwspinlock_ids[] = {
|
|
{ .compatible = "st,stm32-hwspinlock" },
|
|
{}
|
|
};
|
|
|
|
U_BOOT_DRIVER(hwspinlock_stm32mp1) = {
|
|
.name = "hwspinlock_stm32mp1",
|
|
.id = UCLASS_HWSPINLOCK,
|
|
.of_match = stm32mp1_hwspinlock_ids,
|
|
.ops = &stm32mp1_hwspinlock_ops,
|
|
.probe = stm32mp1_hwspinlock_probe,
|
|
.priv_auto_alloc_size = sizeof(struct stm32mp1_hws_priv),
|
|
};
|