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reset: stm32: use the reset-simple driver

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The reset-simple driver can be used without changes.

Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Acked-by: Gabriel Fernandez <gabriel.fernandez@st.com>
This commit is contained in:
Philipp Zabel 2017-08-11 13:02:47 +02:00
parent adf20d7ce7
commit 0af8a13736
4 changed files with 4 additions and 117 deletions
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11
drivers/reset/Kconfig
View File

@ -77,19 +77,14 @@ config RESET_PISTACHIO
config RESET_SIMPLE
bool "Simple Reset Controller Driver" if COMPILE_TEST
default ARCH_SOCFPGA || ARCH_STRATIX10 || ARCH_SUNXI
default ARCH_SOCFPGA || ARCH_STM32 || ARCH_STRATIX10 || ARCH_SUNXI
help
This enables a simple reset controller driver for reset lines that
that can be asserted and deasserted by toggling bits in a contiguous,
exclusive register space.
Currently this driver supports Altera SoCFPGAs and Allwinner SoCs.
config RESET_STM32
bool "STM32 Reset Driver" if COMPILE_TEST
default ARCH_STM32
help
This enables the RCC reset controller driver for STM32 MCUs.
Currently this driver supports Altera SoCFPGAs, the RCC reset
controller in STM32 MCUs, and Allwinner SoCs.
config RESET_SUNXI
bool "Allwinner SoCs Reset Driver" if COMPILE_TEST && !ARCH_SUNXI

1
drivers/reset/Makefile
View File

@ -13,7 +13,6 @@ 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-$(CONFIG_RESET_STM32) += reset-stm32.o
obj-$(CONFIG_RESET_SUNXI) += reset-sunxi.o
obj-$(CONFIG_RESET_TI_SCI) += reset-ti-sci.o
obj-$(CONFIG_RESET_TI_SYSCON) += reset-ti-syscon.o

1
drivers/reset/reset-simple.c
View File

@ -120,6 +120,7 @@ static const struct reset_simple_devdata reset_simple_active_low = {
static const struct of_device_id reset_simple_dt_ids[] = {
{ .compatible = "altr,rst-mgr", .data = &reset_simple_socfpga },
{ .compatible = "st,stm32-rcc", },
{ .compatible = "allwinner,sun6i-a31-clock-reset",
.data = &reset_simple_active_low },
{ /* sentinel */ },

108
drivers/reset/reset-stm32.c
View File

@ -1,108 +0,0 @@
/*
* Copyright (C) Maxime Coquelin 2015
* Author: Maxime Coquelin <mcoquelin.stm32@gmail.com>
* License terms: GNU General Public License (GPL), version 2
*
* Heavily based on sunxi driver from Maxime Ripard.
*/
#include <linux/err.h>
#include <linux/io.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/platform_device.h>
#include <linux/reset-controller.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/types.h>
struct stm32_reset_data {
spinlock_t lock;
void __iomem *membase;
struct reset_controller_dev rcdev;
};
static int stm32_reset_assert(struct reset_controller_dev *rcdev,
unsigned long id)
{
struct stm32_reset_data *data = container_of(rcdev,
struct stm32_reset_data,
rcdev);
int bank = id / BITS_PER_LONG;
int offset = id % BITS_PER_LONG;
unsigned long flags;
u32 reg;
spin_lock_irqsave(&data->lock, flags);
reg = readl(data->membase + (bank * 4));
writel(reg | BIT(offset), data->membase + (bank * 4));
spin_unlock_irqrestore(&data->lock, flags);
return 0;
}
static int stm32_reset_deassert(struct reset_controller_dev *rcdev,
unsigned long id)
{
struct stm32_reset_data *data = container_of(rcdev,
struct stm32_reset_data,
rcdev);
int bank = id / BITS_PER_LONG;
int offset = id % BITS_PER_LONG;
unsigned long flags;
u32 reg;
spin_lock_irqsave(&data->lock, flags);
reg = readl(data->membase + (bank * 4));
writel(reg & ~BIT(offset), data->membase + (bank * 4));
spin_unlock_irqrestore(&data->lock, flags);
return 0;
}
static const struct reset_control_ops stm32_reset_ops = {
.assert = stm32_reset_assert,
.deassert = stm32_reset_deassert,
};
static const struct of_device_id stm32_reset_dt_ids[] = {
{ .compatible = "st,stm32-rcc", },
{ /* sentinel */ },
};
static int stm32_reset_probe(struct platform_device *pdev)
{
struct stm32_reset_data *data;
struct resource *res;
data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
if (!data)
return -ENOMEM;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
data->membase = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(data->membase))
return PTR_ERR(data->membase);
spin_lock_init(&data->lock);
data->rcdev.owner = THIS_MODULE;
data->rcdev.nr_resets = resource_size(res) * 8;
data->rcdev.ops = &stm32_reset_ops;
data->rcdev.of_node = pdev->dev.of_node;
return devm_reset_controller_register(&pdev->dev, &data->rcdev);
}
static struct platform_driver stm32_reset_driver = {
.probe = stm32_reset_probe,
.driver = {
.name = "stm32-rcc-reset",
.of_match_table = stm32_reset_dt_ids,
},
};
builtin_platform_driver(stm32_reset_driver);