[thirdparty/u-boot.git] / drivers / hwspinlock / stm32_hwspinlock.c

// SPDX-License-Identifier: GPL-2.0+ OR BSD-3-Clause
/*
 * Copyright (C) 2018, STMicroelectronics - All Rights Reserved
 */

#define LOG_CATEGORY UCLASS_HWSPINLOCK

#include <common.h>
#include <clk.h>
#include <dm.h>
#include <hwspinlock.h>
#include <malloc.h>
#include <asm/io.h>
#include <linux/bitops.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;

	return clk_enable(&clk);
}

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	= sizeof(struct stm32mp1_hws_priv),
};
Commit	Line	Data
9119f547 BG	1	// SPDX-License-Identifier: GPL-2.0+ OR BSD-3-Clause
	2	/*
	3	* Copyright (C) 2018, STMicroelectronics - All Rights Reserved
	4	*/
	5
fb5b2463 PD	6	#define LOG_CATEGORY UCLASS_HWSPINLOCK
fb5b2463 PD	7
d678a59d	8	#include <common.h>
9119f547 BG	9	#include <clk.h>
	10	#include <dm.h>
	11	#include <hwspinlock.h>
336d4615	12	#include <malloc.h>
9119f547	13	#include <asm/io.h>
cd93d625	14	#include <linux/bitops.h>
9119f547 BG	15
	16	#define STM32_MUTEX_COREID BIT(8)
	17	#define STM32_MUTEX_LOCK_BIT BIT(31)
	18	#define STM32_MUTEX_NUM_LOCKS 32
	19
	20	struct stm32mp1_hws_priv {
	21	fdt_addr_t base;
	22	};
	23
	24	static int stm32mp1_lock(struct udevice *dev, int index)
	25	{
	26	struct stm32mp1_hws_priv *priv = dev_get_priv(dev);
	27	u32 status;
	28
	29	if (index >= STM32_MUTEX_NUM_LOCKS)
	30	return -EINVAL;
	31
	32	status = readl(priv->base + index * sizeof(u32));
	33	if (status == (STM32_MUTEX_LOCK_BIT \| STM32_MUTEX_COREID))
	34	return -EBUSY;
	35
	36	writel(STM32_MUTEX_LOCK_BIT \| STM32_MUTEX_COREID,
	37	priv->base + index * sizeof(u32));
	38
	39	status = readl(priv->base + index * sizeof(u32));
	40	if (status != (STM32_MUTEX_LOCK_BIT \| STM32_MUTEX_COREID))
	41	return -EINVAL;
	42
	43	return 0;
	44	}
	45
	46	static int stm32mp1_unlock(struct udevice *dev, int index)
	47	{
	48	struct stm32mp1_hws_priv *priv = dev_get_priv(dev);
	49
	50	if (index >= STM32_MUTEX_NUM_LOCKS)
	51	return -EINVAL;
	52
	53	writel(STM32_MUTEX_COREID, priv->base + index * sizeof(u32));
	54
	55	return 0;
	56	}
	57
	58	static int stm32mp1_hwspinlock_probe(struct udevice *dev)
	59	{
	60	struct stm32mp1_hws_priv *priv = dev_get_priv(dev);
	61	struct clk clk;
	62	int ret;
	63
	64	priv->base = dev_read_addr(dev);
	65	if (priv->base == FDT_ADDR_T_NONE)
	66	return -EINVAL;
	67
	68	ret = clk_get_by_index(dev, 0, &clk);
	69	if (ret)
	70	return ret;
	71
c9309f40	72	return clk_enable(&clk);
9119f547 BG	73	}
	74
	75	static const struct hwspinlock_ops stm32mp1_hwspinlock_ops = {
	76	.lock = stm32mp1_lock,
	77	.unlock = stm32mp1_unlock,
	78	};
	79
	80	static const struct udevice_id stm32mp1_hwspinlock_ids[] = {
	81	{ .compatible = "st,stm32-hwspinlock" },
	82	{}
	83	};
	84
	85	U_BOOT_DRIVER(hwspinlock_stm32mp1) = {
	86	.name = "hwspinlock_stm32mp1",
	87	.id = UCLASS_HWSPINLOCK,
	88	.of_match = stm32mp1_hwspinlock_ids,
	89	.ops = &stm32mp1_hwspinlock_ops,
	90	.probe = stm32mp1_hwspinlock_probe,
41575d8e	91	.priv_auto = sizeof(struct stm32mp1_hws_priv),
9119f547	92	};