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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2017, STMicroelectronics - All Rights Reserved
* Copyright (C) 2019, Ahmad Fatoum, Pengutronix
* Author(s): Patrice Chotard, <patrice.chotard@st.com> for STMicroelectronics.
*/
#include <common.h>
#include <init.h>
#include <linux/err.h>
#include <linux/reset-controller.h>
#include <asm/io.h>
#define RCC_CL 0x4
struct stm32_reset {
void __iomem *base;
struct reset_controller_dev rcdev;
void (*reset)(void __iomem *reg, unsigned offset, bool assert);
};
static struct stm32_reset *to_stm32_reset(struct reset_controller_dev *rcdev)
{
return container_of(rcdev, struct stm32_reset, rcdev);
}
static void stm32mp_reset(void __iomem *reg, unsigned offset, bool assert)
{
if (!assert)
reg += RCC_CL;
writel(BIT(offset), reg);
}
static void stm32mcu_reset(void __iomem *reg, unsigned offset, bool assert)
{
if (assert)
setbits_le32(reg, BIT(offset));
else
clrbits_le32(reg, BIT(offset));
}
static void stm32_reset(struct stm32_reset *priv, unsigned long id, bool assert)
{
int bank = (id / BITS_PER_LONG) * 4;
int offset = id % BITS_PER_LONG;
priv->reset(priv->base + bank, offset, assert);
}
static int stm32_reset_assert(struct reset_controller_dev *rcdev,
unsigned long id)
{
stm32_reset(to_stm32_reset(rcdev), id, true);
return 0;
}
static int stm32_reset_deassert(struct reset_controller_dev *rcdev,
unsigned long id)
{
stm32_reset(to_stm32_reset(rcdev), id, false);
return 0;
}
static const struct reset_control_ops stm32_reset_ops = {
.assert = stm32_reset_assert,
.deassert = stm32_reset_deassert,
};
static int stm32_reset_probe(struct device_d *dev)
{
struct stm32_reset *priv;
struct resource *iores;
int ret;
priv = xzalloc(sizeof(*priv));
ret = dev_get_drvdata(dev, (const void **)&priv->reset);
if (ret)
return ret;
iores = dev_request_mem_resource(dev, 0);
if (IS_ERR(iores))
return PTR_ERR(iores);
priv->base = IOMEM(iores->start);
priv->rcdev.nr_resets = (iores->end - iores->start) * BITS_PER_BYTE;
priv->rcdev.ops = &stm32_reset_ops;
priv->rcdev.of_node = dev->device_node;
return reset_controller_register(&priv->rcdev);
}
static const struct of_device_id stm32_rcc_reset_dt_ids[] = {
{ .compatible = "st,stm32mp1-rcc", .data = stm32mp_reset },
{ .compatible = "st,stm32-rcc", .data = stm32mcu_reset },
{ /* sentinel */ },
};
static struct driver_d stm32_rcc_reset_driver = {
.name = "stm32_rcc_reset",
.probe = stm32_reset_probe,
.of_compatible = DRV_OF_COMPAT(stm32_rcc_reset_dt_ids),
};
static int stm32_rcc_reset_init(void)
{
return platform_driver_register(&stm32_rcc_reset_driver);
}
postcore_initcall(stm32_rcc_reset_init);
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