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// SPDX-License-Identifier: GPL-2.0-or-later OR BSD-3-Clause
/*
* Copyright (C) 2024, STMicroelectronics - All Rights Reserved
* Author(s): Gabriel Fernandez, <gabriel.fernandez@foss.st.com> for STMicroelectronics.
*/
#include <dm.h>
#include <reset-uclass.h>
#include <stm32-reset-core.h>
#include <stm32_rcc.h>
#include <dm/device_compat.h>
#include <linux/iopoll.h>
static int stm32_reset_update(struct reset_ctl *reset_ctl, bool status)
{
struct stm32_reset_priv *priv = dev_get_priv(reset_ctl->dev);
const struct stm32_reset_data *data = priv->data;
const struct stm32_reset_cfg *ptr_line;
fdt_addr_t addr;
assert(priv->data->get_reset_line);
ptr_line = priv->data->get_reset_line(reset_ctl);
if (!ptr_line)
return -EPERM;
addr = priv->base + ptr_line->offset;
dev_dbg(reset_ctl->dev, "reset id=%ld offset=0x%x bit=%d status=%d\n",
reset_ctl->id, ptr_line->offset, ptr_line->bit_idx, status);
status = ptr_line->inverted ^ status;
if (ptr_line->set_clr) {
if (!status)
addr += data->clear_offset;
writel(BIT(ptr_line->bit_idx), addr);
} else {
if (status)
setbits_le32(addr, BIT(ptr_line->bit_idx));
else
clrbits_le32(addr, BIT(ptr_line->bit_idx));
}
/* Check deassert */
if (!status) {
u32 reg;
return readl_poll_timeout(addr, reg,
!(reg & BIT(ptr_line->bit_idx)),
data->reset_us);
}
return 0;
}
static int stm32_reset_assert(struct reset_ctl *reset_ctl)
{
return stm32_reset_update(reset_ctl, true);
}
static int stm32_reset_deassert(struct reset_ctl *reset_ctl)
{
return stm32_reset_update(reset_ctl, false);
}
const struct reset_ops stm32_reset_ops = {
.rst_assert = stm32_reset_assert,
.rst_deassert = stm32_reset_deassert,
};
int stm32_reset_core_probe(struct udevice *dev,
const struct stm32_reset_data *data)
{
struct stm32_reset_priv *priv = dev_get_priv(dev);
priv->base = dev_read_addr(dev);
if (priv->base == FDT_ADDR_T_NONE) {
/* for MFD, get address of parent */
priv->base = dev_read_addr(dev->parent);
if (priv->base == FDT_ADDR_T_NONE)
return -EINVAL;
}
priv->data = data;
assert(priv->data);
return 0;
}
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