tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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: Chen Feng <puck.chen@hisilicon.com>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
authored by
Chen Feng
and committed by
Philipp Zabel
f59d23c2
04d11269
+116
+1
drivers/reset/Kconfig
+1
drivers/reset/Kconfig
+1
drivers/reset/Makefile
+1
drivers/reset/Makefile
+5
drivers/reset/hisilicon/Kconfig
+5
drivers/reset/hisilicon/Kconfig
+1
drivers/reset/hisilicon/Makefile
+1
drivers/reset/hisilicon/Makefile
···
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obj-$(CONFIG_COMMON_RESET_HI6220) += hi6220_reset.o
+108
drivers/reset/hisilicon/hi6220_reset.c
+108
drivers/reset/hisilicon/hi6220_reset.c
···
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/*
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* Hisilicon Hi6220 reset controller driver
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*
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* Copyright (c) 2015 Hisilicon Limited.
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*
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* Author: Feng Chen <puck.chen@hisilicon.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/io.h>
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#include <linux/init.h>
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#include <linux/bitops.h>
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#include <linux/of.h>
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#include <linux/reset-controller.h>
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#include <linux/reset.h>
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#include <linux/platform_device.h>
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#define ASSERT_OFFSET 0x300
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#define DEASSERT_OFFSET 0x304
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#define MAX_INDEX 0x509
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#define to_reset_data(x) container_of(x, struct hi6220_reset_data, rc_dev)
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struct hi6220_reset_data {
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void __iomem *assert_base;
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void __iomem *deassert_base;
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struct reset_controller_dev rc_dev;
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};
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static int hi6220_reset_assert(struct reset_controller_dev *rc_dev,
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unsigned long idx)
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{
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struct hi6220_reset_data *data = to_reset_data(rc_dev);
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int bank = idx >> 8;
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int offset = idx & 0xff;
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writel(BIT(offset), data->assert_base + (bank * 0x10));
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return 0;
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}
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static int hi6220_reset_deassert(struct reset_controller_dev *rc_dev,
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unsigned long idx)
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{
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struct hi6220_reset_data *data = to_reset_data(rc_dev);
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int bank = idx >> 8;
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int offset = idx & 0xff;
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writel(BIT(offset), data->deassert_base + (bank * 0x10));
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return 0;
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}
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static struct reset_control_ops hi6220_reset_ops = {
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.assert = hi6220_reset_assert,
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.deassert = hi6220_reset_deassert,
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};
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static int hi6220_reset_probe(struct platform_device *pdev)
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{
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struct hi6220_reset_data *data;
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struct resource *res;
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void __iomem *src_base;
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data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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src_base = devm_ioremap_resource(&pdev->dev, res);
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if (IS_ERR(src_base))
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return PTR_ERR(src_base);
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data->assert_base = src_base + ASSERT_OFFSET;
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data->deassert_base = src_base + DEASSERT_OFFSET;
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data->rc_dev.nr_resets = MAX_INDEX;
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data->rc_dev.ops = &hi6220_reset_ops;
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data->rc_dev.of_node = pdev->dev.of_node;
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reset_controller_register(&data->rc_dev);
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return 0;
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}
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static const struct of_device_id hi6220_reset_match[] = {
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{ .compatible = "hisilicon,hi6220-sysctrl" },
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{ },
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};
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static struct platform_driver hi6220_reset_driver = {
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.probe = hi6220_reset_probe,
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.driver = {
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.name = "reset-hi6220",
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.of_match_table = hi6220_reset_match,
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},
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};
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static int __init hi6220_reset_init(void)
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{
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return platform_driver_register(&hi6220_reset_driver);
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}
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postcore_initcall(hi6220_reset_init);