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Commit f59d23c2 authored by Chen Feng's avatar Chen Feng Committed by Philipp Zabel
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reset: hi6220: Reset driver for hisilicon hi6220 SoC 



Add reset driver for hi6220-hikey board,this driver supply deassert
of IP on hi6220 SoC.

Signed-off-by: default avatarChen Feng <puck.chen@hisilicon.com>
Signed-off-by: default avatarPhilipp Zabel <p.zabel@pengutronix.de>
parent 04d11269

drivers/reset/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -13,3 +13,4 @@ menuconfig RESET_CONTROLLER 
	  If unsure, say no.



source "drivers/reset/sti/Kconfig"

source "drivers/reset/hisilicon/Kconfig"

drivers/reset/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -4,5 +4,6 @@ obj-$(CONFIG_ARCH_SOCFPGA) += reset-socfpga.o 
obj-$(CONFIG_ARCH_BERLIN) += reset-berlin.o

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

obj-$(CONFIG_ARCH_STI) += sti/

obj-$(CONFIG_ARCH_HISI) += hisilicon/

obj-$(CONFIG_ARCH_ZYNQ) += reset-zynq.o

obj-$(CONFIG_ATH79) += reset-ath79.o

drivers/reset/hisilicon/Kconfig

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+5 −0
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config COMMON_RESET_HI6220

	tristate "Hi6220 Reset Driver"

	depends on (ARCH_HISI && RESET_CONTROLLER)

	help

	  Build the Hisilicon Hi6220 reset driver.

drivers/reset/hisilicon/Makefile

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obj-$(CONFIG_COMMON_RESET_HI6220) += hi6220_reset.o

drivers/reset/hisilicon/hi6220_reset.c

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+108 −0
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/*

 * Hisilicon Hi6220 reset controller driver

 *

 * Copyright (c) 2015 Hisilicon Limited.

 *

 * Author: Feng Chen <puck.chen@hisilicon.com>

 *

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

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation.

 */



#include <linux/io.h>

#include <linux/init.h>

#include <linux/bitops.h>

#include <linux/of.h>

#include <linux/reset-controller.h>

#include <linux/reset.h>

#include <linux/platform_device.h>



#define ASSERT_OFFSET            0x300

#define DEASSERT_OFFSET          0x304

#define MAX_INDEX                0x509



#define to_reset_data(x) container_of(x, struct hi6220_reset_data, rc_dev)



struct hi6220_reset_data {

	void __iomem			*assert_base;

	void __iomem			*deassert_base;

	struct reset_controller_dev	rc_dev;

};



static int hi6220_reset_assert(struct reset_controller_dev *rc_dev,

			       unsigned long idx)

{

	struct hi6220_reset_data *data = to_reset_data(rc_dev);



	int bank = idx >> 8;

	int offset = idx & 0xff;



	writel(BIT(offset), data->assert_base + (bank * 0x10));



	return 0;

}



static int hi6220_reset_deassert(struct reset_controller_dev *rc_dev,

				 unsigned long idx)

{

	struct hi6220_reset_data *data = to_reset_data(rc_dev);



	int bank = idx >> 8;

	int offset = idx & 0xff;



	writel(BIT(offset), data->deassert_base + (bank * 0x10));



	return 0;

}



static struct reset_control_ops hi6220_reset_ops = {

	.assert = hi6220_reset_assert,

	.deassert = hi6220_reset_deassert,

};



static int hi6220_reset_probe(struct platform_device *pdev)

{

	struct hi6220_reset_data *data;

	struct resource *res;

	void __iomem *src_base;



	data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);

	if (!data)

		return -ENOMEM;



	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);

	src_base = devm_ioremap_resource(&pdev->dev, res);

	if (IS_ERR(src_base))

		return PTR_ERR(src_base);



	data->assert_base = src_base + ASSERT_OFFSET;

	data->deassert_base = src_base + DEASSERT_OFFSET;

	data->rc_dev.nr_resets = MAX_INDEX;

	data->rc_dev.ops = &hi6220_reset_ops;

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



	reset_controller_register(&data->rc_dev);



	return 0;

}



static const struct of_device_id hi6220_reset_match[] = {

	{ .compatible = "hisilicon,hi6220-sysctrl" },

	{ },

};



static struct platform_driver hi6220_reset_driver = {

	.probe = hi6220_reset_probe,

	.driver = {

		.name = "reset-hi6220",

		.of_match_table = hi6220_reset_match,

	},

};



static int __init hi6220_reset_init(void)

{

	return platform_driver_register(&hi6220_reset_driver);

}



postcore_initcall(hi6220_reset_init);