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Commit b38386f4 authored by Baoyou Xie's avatar Baoyou Xie Committed by Philipp Zabel
Browse files

reset: zx2967: add reset controller driver for ZTE's zx2967 family 



This patch adds reset controller driver for ZTE's zx2967 family.

Signed-off-by: default avatarBaoyou Xie <baoyou.xie@linaro.org>
Reviewed-by: default avatarShawn Guo <shawnguo@kernel.org>
Signed-off-by: default avatarPhilipp Zabel <p.zabel@pengutronix.de>
parent 8041311c

drivers/reset/Kconfig

+6 −0
Original line number Diff line number Diff line
@@ -86,6 +86,12 @@ config RESET_UNIPHIER 
	  Say Y if you want to control reset signals provided by System Control

	  block, Media I/O block, Peripheral Block.



config RESET_ZX2967

	bool "ZTE ZX2967 Reset Driver"

	depends on ARCH_ZX || COMPILE_TEST

	help

	  This enables the reset controller driver for ZTE's zx2967 family.



config RESET_ZYNQ

	bool "ZYNQ Reset Driver" if COMPILE_TEST

	default ARCH_ZYNQ

drivers/reset/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -13,4 +13,5 @@ obj-$(CONFIG_RESET_STM32) += reset-stm32.o 
obj-$(CONFIG_RESET_SUNXI) += reset-sunxi.o

obj-$(CONFIG_TI_SYSCON_RESET) += reset-ti-syscon.o

obj-$(CONFIG_RESET_UNIPHIER) += reset-uniphier.o

obj-$(CONFIG_RESET_ZX2967) += reset-zx2967.o

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

drivers/reset/reset-zx2967.c

0 → 100644
+106 −0
Original line number Diff line number Diff line 
/*

 * ZTE's zx2967 family reset controller driver

 *

 * Copyright (C) 2017 ZTE Ltd.

 *

 * Author: Baoyou Xie <baoyou.xie@linaro.org>

 *

 * License terms: GNU General Public License (GPL) version 2

 */



#include <linux/module.h>

#include <linux/of_address.h>

#include <linux/platform_device.h>

#include <linux/reset-controller.h>



struct zx2967_reset {

	void __iomem			*reg_base;

	spinlock_t			lock;

	struct reset_controller_dev	rcdev;

};



static int zx2967_reset_act(struct reset_controller_dev *rcdev,

			    unsigned long id, bool assert)

{

	struct zx2967_reset *reset = NULL;

	int bank = id / 32;

	int offset = id % 32;

	u32 reg;

	unsigned long flags;



	reset = container_of(rcdev, struct zx2967_reset, rcdev);



	spin_lock_irqsave(&reset->lock, flags);



	reg = readl_relaxed(reset->reg_base + (bank * 4));

	if (assert)

		reg &= ~BIT(offset);

	else

		reg |= BIT(offset);

	writel_relaxed(reg, reset->reg_base + (bank * 4));



	spin_unlock_irqrestore(&reset->lock, flags);



	return 0;

}



static int zx2967_reset_assert(struct reset_controller_dev *rcdev,

			       unsigned long id)

{

	return zx2967_reset_act(rcdev, id, true);

}



static int zx2967_reset_deassert(struct reset_controller_dev *rcdev,

				 unsigned long id)

{

	return zx2967_reset_act(rcdev, id, false);

}



static struct reset_control_ops zx2967_reset_ops = {

	.assert		= zx2967_reset_assert,

	.deassert	= zx2967_reset_deassert,

};



static int zx2967_reset_probe(struct platform_device *pdev)

{

	struct zx2967_reset *reset;

	struct resource *res;



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

	if (!reset)

		return -ENOMEM;



	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);

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

	if (IS_ERR(reset->reg_base))

		return PTR_ERR(reset->reg_base);



	spin_lock_init(&reset->lock);



	reset->rcdev.owner = THIS_MODULE;

	reset->rcdev.nr_resets = resource_size(res) * 8;

	reset->rcdev.ops = &zx2967_reset_ops;

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



	return devm_reset_controller_register(&pdev->dev, &reset->rcdev);

}



static const struct of_device_id zx2967_reset_dt_ids[] = {

	 { .compatible = "zte,zx296718-reset", },

	 {},

};

MODULE_DEVICE_TABLE(of, zx2967_reset_dt_ids);



static struct platform_driver zx2967_reset_driver = {

	.probe	= zx2967_reset_probe,

	.driver = {

		.name		= "zx2967-reset",

		.of_match_table	= zx2967_reset_dt_ids,

	},

};



builtin_platform_driver(zx2967_reset_driver);



MODULE_AUTHOR("Baoyou Xie <baoyou.xie@linaro.org>");

MODULE_DESCRIPTION("ZTE zx2967 Reset Controller Driver");

MODULE_LICENSE("GPL");