Commit adf20d7c authored by Philipp Zabel's avatar Philipp Zabel
Browse files

reset: socfpga: use the reset-simple driver 



Add reset line status readback, inverted status support, and socfpga
device tree quirks to the simple reset driver, and use it to replace
the socfpga driver.

Signed-off-by: default avatarPhilipp Zabel <p.zabel@pengutronix.de>
parent e13c205a

drivers/reset/Kconfig

+2 −8
Original line number Diff line number Diff line
@@ -77,19 +77,13 @@ config RESET_PISTACHIO 


config RESET_SIMPLE

	bool "Simple Reset Controller Driver" if COMPILE_TEST

	default ARCH_SUNXI

	default ARCH_SOCFPGA || 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 Allwinner SoCs.



config RESET_SOCFPGA

	bool "SoCFPGA Reset Driver" if COMPILE_TEST

	default ARCH_SOCFPGA || ARCH_STRATIX10

	help

	  This enables the reset controller driver for Altera SoCFPGAs.

	  Currently this driver supports Altera SoCFPGAs and Allwinner SoCs.



config RESET_STM32

	bool "STM32 Reset Driver" if COMPILE_TEST

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_SOCFPGA) += reset-socfpga.o

obj-$(CONFIG_RESET_STM32) += reset-stm32.o

obj-$(CONFIG_RESET_SUNXI) += reset-sunxi.o

obj-$(CONFIG_RESET_TI_SCI) += reset-ti-sci.o

drivers/reset/reset-simple.c

+50 −1
Original line number Diff line number Diff line
@@ -68,25 +68,58 @@ static int reset_simple_deassert(struct reset_controller_dev *rcdev, 
	return reset_simple_update(rcdev, id, false);

}



static int reset_simple_status(struct reset_controller_dev *rcdev,

			       unsigned long id)

{

	struct reset_simple_data *data = to_reset_simple_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)) ^ !data->status_active_low;

}



const struct reset_control_ops reset_simple_ops = {

	.assert		= reset_simple_assert,

	.deassert	= reset_simple_deassert,

	.status		= reset_simple_status,

};



/**

 * struct reset_simple_devdata - simple reset controller properties

 * @reg_offset: offset between base address and first reset register.

 * @nr_resets: number of resets. If not set, default to resource size in bits.

 * @active_low: if true, bits are cleared to assert the reset. Otherwise, bits

 *              are set to assert the reset.

 * @status_active_low: if true, bits read back as cleared while the reset is

 *                     asserted. Otherwise, bits read back as set while the

 *                     reset is asserted.

 */

struct reset_simple_devdata {

	u32 reg_offset;

	u32 nr_resets;

	bool active_low;

	bool status_active_low;

};



#define SOCFPGA_NR_BANKS	8



static const struct reset_simple_devdata reset_simple_socfpga = {

	.reg_offset = 0x10,

	.nr_resets = SOCFPGA_NR_BANKS * 32,

	.status_active_low = true,

};



static const struct reset_simple_devdata reset_simple_active_low = {

	.active_low = true,

	.status_active_low = true,

};



static const struct of_device_id reset_simple_dt_ids[] = {

	{ .compatible = "altr,rst-mgr", .data = &reset_simple_socfpga },

	{ .compatible = "allwinner,sun6i-a31-clock-reset",

		.data = &reset_simple_active_low },

	{ /* sentinel */ },
@@ -99,6 +132,7 @@ static int reset_simple_probe(struct platform_device *pdev) 
	struct reset_simple_data *data;

	void __iomem *membase;

	struct resource *res;

	u32 reg_offset = 0;



	devdata = of_device_get_match_data(dev);
@@ -118,8 +152,23 @@ static int reset_simple_probe(struct platform_device *pdev) 
	data->rcdev.ops = &reset_simple_ops;

	data->rcdev.of_node = dev->of_node;



	if (devdata)

	if (devdata) {

		reg_offset = devdata->reg_offset;

		if (devdata->nr_resets)

			data->rcdev.nr_resets = devdata->nr_resets;

		data->active_low = devdata->active_low;

		data->status_active_low = devdata->status_active_low;

	}



	if (of_device_is_compatible(dev->of_node, "altr,rst-mgr") &&

	    of_property_read_u32(dev->of_node, "altr,modrst-offset",

				 &reg_offset)) {

		dev_warn(dev,

			 "missing altr,modrst-offset property, assuming 0x%x!\n",

			 reg_offset);

	}



	data->membase += reg_offset;



	return devm_reset_controller_register(dev, &data->rcdev);

}

drivers/reset/reset-simple.h

+4 −0
Original line number Diff line number Diff line
@@ -28,12 +28,16 @@ 
 * @active_low: if true, bits are cleared to assert the reset. Otherwise, bits

 *              are set to assert the reset. Note that this says nothing about

 *              the voltage level of the actual reset line.

 * @status_active_low: if true, bits read back as cleared while the reset is

 *                     asserted. Otherwise, bits read back as set while the

 *                     reset is asserted.

 */

struct reset_simple_data {

	spinlock_t			lock;

	void __iomem			*membase;

	struct reset_controller_dev	rcdev;

	bool				active_low;

	bool				status_active_low;

};



extern const struct reset_control_ops reset_simple_ops;

drivers/reset/reset-socfpga.c

deleted100644 → 0
+0 −157
Original line number Diff line number Diff line 
/*

 * Socfpga Reset Controller Driver

 *

 * Copyright 2014 Steffen Trumtrar <s.trumtrar@pengutronix.de>

 *

 * based on

 * Allwinner SoCs Reset Controller driver

 *

 * Copyright 2013 Maxime Ripard

 *

 * Maxime Ripard <maxime.ripard@free-electrons.com>

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 2 of the License, or

 * (at your option) any later version.

 */



#include <linux/err.h>

#include <linux/io.h>

#include <linux/init.h>

#include <linux/of.h>

#include <linux/platform_device.h>

#include <linux/reset-controller.h>

#include <linux/spinlock.h>

#include <linux/types.h>



#define BANK_INCREMENT		4

#define NR_BANKS		8



struct socfpga_reset_data {

	spinlock_t			lock;

	void __iomem			*membase;

	struct reset_controller_dev	rcdev;

};



static int socfpga_reset_assert(struct reset_controller_dev *rcdev,

				unsigned long id)

{

	struct socfpga_reset_data *data = container_of(rcdev,

						     struct socfpga_reset_data,

						     rcdev);

	int reg_width = sizeof(u32);

	int bank = id / (reg_width * BITS_PER_BYTE);

	int offset = id % (reg_width * BITS_PER_BYTE);

	unsigned long flags;

	u32 reg;



	spin_lock_irqsave(&data->lock, flags);



	reg = readl(data->membase + (bank * BANK_INCREMENT));

	writel(reg | BIT(offset), data->membase + (bank * BANK_INCREMENT));

	spin_unlock_irqrestore(&data->lock, flags);



	return 0;

}



static int socfpga_reset_deassert(struct reset_controller_dev *rcdev,

				  unsigned long id)

{

	struct socfpga_reset_data *data = container_of(rcdev,

						     struct socfpga_reset_data,

						     rcdev);



	int reg_width = sizeof(u32);

	int bank = id / (reg_width * BITS_PER_BYTE);

	int offset = id % (reg_width * BITS_PER_BYTE);

	unsigned long flags;

	u32 reg;



	spin_lock_irqsave(&data->lock, flags);



	reg = readl(data->membase + (bank * BANK_INCREMENT));

	writel(reg & ~BIT(offset), data->membase + (bank * BANK_INCREMENT));



	spin_unlock_irqrestore(&data->lock, flags);



	return 0;

}



static int socfpga_reset_status(struct reset_controller_dev *rcdev,

				unsigned long id)

{

	struct socfpga_reset_data *data = container_of(rcdev,

						struct socfpga_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 * BANK_INCREMENT));



	return !(reg & BIT(offset));

}



static const struct reset_control_ops socfpga_reset_ops = {

	.assert		= socfpga_reset_assert,

	.deassert	= socfpga_reset_deassert,

	.status		= socfpga_reset_status,

};



static int socfpga_reset_probe(struct platform_device *pdev)

{

	struct socfpga_reset_data *data;

	struct resource *res;

	struct device *dev = &pdev->dev;

	struct device_node *np = dev->of_node;

	u32 modrst_offset;



	/*

	 * The binding was mainlined without the required property.

	 * Do not continue, when we encounter an old DT.

	 */

	if (!of_find_property(pdev->dev.of_node, "#reset-cells", NULL)) {

		dev_err(&pdev->dev, "%pOF missing #reset-cells property\n",

			pdev->dev.of_node);

		return -EINVAL;

	}



	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);



	if (of_property_read_u32(np, "altr,modrst-offset", &modrst_offset)) {

		dev_warn(dev, "missing altr,modrst-offset property, assuming 0x10!\n");

		modrst_offset = 0x10;

	}

	data->membase += modrst_offset;



	spin_lock_init(&data->lock);



	data->rcdev.owner = THIS_MODULE;

	data->rcdev.nr_resets = NR_BANKS * (sizeof(u32) * BITS_PER_BYTE);

	data->rcdev.ops = &socfpga_reset_ops;

	data->rcdev.of_node = pdev->dev.of_node;



	return devm_reset_controller_register(dev, &data->rcdev);

}



static const struct of_device_id socfpga_reset_dt_ids[] = {

	{ .compatible = "altr,rst-mgr", },

	{ /* sentinel */ },

};



static struct platform_driver socfpga_reset_driver = {

	.probe	= socfpga_reset_probe,

	.driver = {

		.name		= "socfpga-reset",

		.of_match_table	= socfpga_reset_dt_ids,

	},

};

builtin_platform_driver(socfpga_reset_driver);

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