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dm: reset: add stm32 reset driver

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This driver is adapted from linux drivers/reset/reset-stm32.c
It's compatible with STM32 F4/F7/H7 SoCs.

This driver doesn't implement .of_match as it's binded
by MFD RCC driver.

To add support for each SoC family, a SoC's specific
include/dt-binfings/mfd/stm32xx-rcc.h file must be added.

This patch only includes stm32h7-rcc.h dedicated for STM32H7 SoCs.
Other SoCs support will be added in the future.

Signed-off-by: Patrice Chotard <patrice.chotard@st.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Patrice Chotard
2017-09-13 18:00:07 +02:00
committed by Tom Rini
parent 4c3aebd56a
commit 23a0641685
5 changed files with 232 additions and 0 deletions
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80
drivers/reset/stm32-reset.c Normal file
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/*
* Copyright (C) STMicroelectronics SA 2017
* Author(s): Patrice CHOTARD, <patrice.chotard@st.com> for STMicroelectronics.
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <dm.h>
#include <errno.h>
#include <reset-uclass.h>
#include <asm/io.h>
DECLARE_GLOBAL_DATA_PTR;
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);
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);
clrbits_le32(priv->base + bank, BIT(offset));
return 0;
}
static const struct reset_ops stm32_reset_ops = {
.request = stm32_reset_request,
.free = 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 = devfdt_get_addr(dev);
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,
};