94 lines
2.3 KiB
C
94 lines
2.3 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* Copyright (C) 2017, STMicroelectronics - All Rights Reserved
|
|
* Author(s): Patrice Chotard, <patrice.chotard@st.com> for STMicroelectronics.
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <dm.h>
|
|
#include <errno.h>
|
|
#include <reset-uclass.h>
|
|
#include <stm32_rcc.h>
|
|
#include <asm/io.h>
|
|
|
|
/* reset clear offset for STM32MP RCC */
|
|
#define RCC_CL 0x4
|
|
|
|
struct stm32_reset_priv {
|
|
fdt_addr_t base;
|
|
};
|
|
|
|
static int stm32_reset_request(struct reset_ctl *reset_ctl)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static int stm32_reset_free(struct reset_ctl *reset_ctl)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static int stm32_reset_assert(struct reset_ctl *reset_ctl)
|
|
{
|
|
struct stm32_reset_priv *priv = dev_get_priv(reset_ctl->dev);
|
|
int bank = (reset_ctl->id / BITS_PER_LONG) * 4;
|
|
int offset = reset_ctl->id % BITS_PER_LONG;
|
|
debug("%s: reset id = %ld bank = %d offset = %d)\n", __func__,
|
|
reset_ctl->id, bank, offset);
|
|
|
|
if (dev_get_driver_data(reset_ctl->dev) == STM32MP1)
|
|
/* reset assert is done in rcc set register */
|
|
writel(BIT(offset), priv->base + bank);
|
|
else
|
|
setbits_le32(priv->base + bank, BIT(offset));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int stm32_reset_deassert(struct reset_ctl *reset_ctl)
|
|
{
|
|
struct stm32_reset_priv *priv = dev_get_priv(reset_ctl->dev);
|
|
int bank = (reset_ctl->id / BITS_PER_LONG) * 4;
|
|
int offset = reset_ctl->id % BITS_PER_LONG;
|
|
debug("%s: reset id = %ld bank = %d offset = %d)\n", __func__,
|
|
reset_ctl->id, bank, offset);
|
|
|
|
if (dev_get_driver_data(reset_ctl->dev) == STM32MP1)
|
|
/* reset deassert is done in rcc clr register */
|
|
writel(BIT(offset), priv->base + bank + RCC_CL);
|
|
else
|
|
clrbits_le32(priv->base + bank, BIT(offset));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct reset_ops stm32_reset_ops = {
|
|
.request = stm32_reset_request,
|
|
.rfree = stm32_reset_free,
|
|
.rst_assert = stm32_reset_assert,
|
|
.rst_deassert = stm32_reset_deassert,
|
|
};
|
|
|
|
static int stm32_reset_probe(struct udevice *dev)
|
|
{
|
|
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;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
U_BOOT_DRIVER(stm32_rcc_reset) = {
|
|
.name = "stm32_rcc_reset",
|
|
.id = UCLASS_RESET,
|
|
.probe = stm32_reset_probe,
|
|
.priv_auto_alloc_size = sizeof(struct stm32_reset_priv),
|
|
.ops = &stm32_reset_ops,
|
|
};
|