Commit 0af8a137 authored by Philipp Zabel's avatar Philipp Zabel
Browse files

reset: stm32: use the reset-simple driver 



The reset-simple driver can be used without changes.

Signed-off-by: default avatarPhilipp Zabel <p.zabel@pengutronix.de>
Acked-by: default avatarGabriel Fernandez <gabriel.fernandez@st.com>
parent adf20d7c

drivers/reset/Kconfig

+3 −8
Original line number Diff line number Diff line
@@ -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

drivers/reset/Makefile

+0 −1
Original line number Diff line number Diff line
@@ -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

drivers/reset/reset-simple.c

+1 −0
Original line number Diff line number Diff line
@@ -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 */ },

drivers/reset/reset-stm32.c

deleted100644 → 0
+0 −108
Original line number Diff line number Diff line 
/*

 * 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);