reset: stm32mp1: Enable stm32mp1 reset driver

stm32mp1 RCC IP 1 has a reset SET register and a reset CLEAR register.

Writing '0' on reset SET register has no effect
Writing '1' on reset SET register
	activates the reset of the corresponding peripheral

Writing '0' on reset CLEAR register	has no effect
Writing '1' on reset CLEAR register
	releases the reset of the corresponding peripheral

See Documentation/devicetree/bindings/clock/st,stm32mp1-rcc.txt

Signed-off-by: Gabriel Fernandez <gabriel.fernandez@st.com>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
This commit is contained in:
Gabriel Fernandez 2018-03-19 08:25:51 +01:00 committed by Philipp Zabel
parent dae5af9762
commit 197858b685
3 changed files with 122 additions and 0 deletions

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@ -97,6 +97,12 @@ config RESET_SIMPLE
- Allwinner SoCs
- ZTE's zx2967 family
config RESET_STM32MP157
bool "STM32MP157 Reset Driver" if COMPILE_TEST
default MACH_STM32MP157
help
This enables the RCC reset controller driver for STM32 MPUs.
config RESET_SUNXI
bool "Allwinner SoCs Reset Driver" if COMPILE_TEST && !ARCH_SUNXI
default ARCH_SUNXI

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@ -15,6 +15,7 @@ obj-$(CONFIG_RESET_MESON) += reset-meson.o
obj-$(CONFIG_RESET_OXNAS) += reset-oxnas.o
obj-$(CONFIG_RESET_PISTACHIO) += reset-pistachio.o
obj-$(CONFIG_RESET_SIMPLE) += reset-simple.o
obj-$(CONFIG_RESET_STM32MP157) += reset-stm32mp1.o
obj-$(CONFIG_RESET_SUNXI) += reset-sunxi.o
obj-$(CONFIG_RESET_TI_SCI) += reset-ti-sci.o
obj-$(CONFIG_RESET_TI_SYSCON) += reset-ti-syscon.o

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@ -0,0 +1,115 @@
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) STMicroelectronics 2018 - All Rights Reserved
* Author: Gabriel Fernandez <gabriel.fernandez@st.com> for STMicroelectronics.
*/
#include <linux/device.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/reset-controller.h>
#define CLR_OFFSET 0x4
struct stm32_reset_data {
struct reset_controller_dev rcdev;
void __iomem *membase;
};
static inline struct stm32_reset_data *
to_stm32_reset_data(struct reset_controller_dev *rcdev)
{
return container_of(rcdev, struct stm32_reset_data, rcdev);
}
static int stm32_reset_update(struct reset_controller_dev *rcdev,
unsigned long id, bool assert)
{
struct stm32_reset_data *data = to_stm32_reset_data(rcdev);
int reg_width = sizeof(u32);
int bank = id / (reg_width * BITS_PER_BYTE);
int offset = id % (reg_width * BITS_PER_BYTE);
void __iomem *addr;
addr = data->membase + (bank * reg_width);
if (!assert)
addr += CLR_OFFSET;
writel(BIT(offset), addr);
return 0;
}
static int stm32_reset_assert(struct reset_controller_dev *rcdev,
unsigned long id)
{
return stm32_reset_update(rcdev, id, true);
}
static int stm32_reset_deassert(struct reset_controller_dev *rcdev,
unsigned long id)
{
return stm32_reset_update(rcdev, id, false);
}
static int stm32_reset_status(struct reset_controller_dev *rcdev,
unsigned long id)
{
struct stm32_reset_data *data = to_stm32_reset_data(rcdev);
int reg_width = sizeof(u32);
int bank = id / (reg_width * BITS_PER_BYTE);
int offset = id % (reg_width * BITS_PER_BYTE);
u32 reg;
reg = readl(data->membase + (bank * reg_width));
return !!(reg & BIT(offset));
}
static const struct reset_control_ops stm32_reset_ops = {
.assert = stm32_reset_assert,
.deassert = stm32_reset_deassert,
.status = stm32_reset_status,
};
static const struct of_device_id stm32_reset_dt_ids[] = {
{ .compatible = "st,stm32mp1-rcc"},
{ /* sentinel */ },
};
static int stm32_reset_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct stm32_reset_data *data;
void __iomem *membase;
struct resource *res;
data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
if (!data)
return -ENOMEM;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
membase = devm_ioremap_resource(dev, res);
if (IS_ERR(membase))
return PTR_ERR(membase);
data->membase = membase;
data->rcdev.owner = THIS_MODULE;
data->rcdev.nr_resets = resource_size(res) * BITS_PER_BYTE;
data->rcdev.ops = &stm32_reset_ops;
data->rcdev.of_node = dev->of_node;
return devm_reset_controller_register(dev, &data->rcdev);
}
static struct platform_driver stm32_reset_driver = {
.probe = stm32_reset_probe,
.driver = {
.name = "stm32mp1-reset",
.of_match_table = stm32_reset_dt_ids,
},
};
builtin_platform_driver(stm32_reset_driver);