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    SubjectRe: [PATCH V3 3/3] reset: hi6220: Reset driver for hisilicon hi6220 SoC
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    On 2015/9/15 11:58, Chen Feng wrote:
    > 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>
    > ---
    > drivers/reset/Kconfig | 1 +
    > drivers/reset/Makefile | 1 +
    > drivers/reset/hisilicon/Kconfig | 5 ++
    > drivers/reset/hisilicon/Makefile | 1 +
    > drivers/reset/hisilicon/hi6220_reset.c | 121 +++++++++++++++++++++++++++++++++
    > 5 files changed, 129 insertions(+)
    > create mode 100644 drivers/reset/hisilicon/Kconfig
    > create mode 100644 drivers/reset/hisilicon/Makefile
    > create mode 100644 drivers/reset/hisilicon/hi6220_reset.c
    >
    > diff --git a/drivers/reset/Kconfig b/drivers/reset/Kconfig
    > index 0615f50..df37212 100644
    > --- a/drivers/reset/Kconfig
    > +++ b/drivers/reset/Kconfig
    > @@ -13,3 +13,4 @@ menuconfig RESET_CONTROLLER
    > If unsure, say no.
    >
    > source "drivers/reset/sti/Kconfig"
    > +source "drivers/reset/hisilicon/Kconfig"
    > diff --git a/drivers/reset/Makefile b/drivers/reset/Makefile
    > index 157d421..331d7b2 100644
    > --- a/drivers/reset/Makefile
    > +++ b/drivers/reset/Makefile
    > @@ -3,3 +3,4 @@ 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-$(CONFIG_ARCH_HISI) += hisilicon/
    > diff --git a/drivers/reset/hisilicon/Kconfig b/drivers/reset/hisilicon/Kconfig
    > new file mode 100644
    > index 0000000..26bf95a
    > --- /dev/null
    > +++ b/drivers/reset/hisilicon/Kconfig
    > @@ -0,0 +1,5 @@
    > +config COMMON_RESET_HI6220
    > + tristate "Hi6220 Reset Driver"
    > + depends on (ARCH_HISI && RESET_CONTROLLER)
    > + help
    > + Build the Hisilicon Hi6220 reset driver.
    > diff --git a/drivers/reset/hisilicon/Makefile b/drivers/reset/hisilicon/Makefile
    > new file mode 100644
    > index 0000000..c932f86
    > --- /dev/null
    > +++ b/drivers/reset/hisilicon/Makefile
    > @@ -0,0 +1 @@
    > +obj-$(CONFIG_COMMON_RESET_HI6220) += hi6220_reset.o
    > diff --git a/drivers/reset/hisilicon/hi6220_reset.c b/drivers/reset/hisilicon/hi6220_reset.c
    > new file mode 100644
    > index 0000000..3d3de94
    > --- /dev/null
    > +++ b/drivers/reset/hisilicon/hi6220_reset.c
    > @@ -0,0 +1,121 @@
    > +/*
    > + * 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/init.h>
    > +#include <linux/bitops.h>
    > +#include <linux/of.h>
    > +#include <linux/reset-controller.h>
    > +#include <linux/reset.h>
    > +#include <linux/sizes.h>
    > +#include <linux/platform_device.h>
    > +
    > +#define ASSET_OFFSET 0x300
    > +#define DEASSET_OFFSET 0x304
    > +
    > +#define to_reset_data(x) container_of(x, struct hi6220_reset_data, rc_dev)
    > +
    > +struct hi6220_reset_data {
    > + spinlock_t reset_lock; /*device spin-lock*/

    it looks useless

    > + void __iomem *asset_base;
    > + void __iomem *deasset_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);
    > +
    > + unsigned long flags;
    > + int bank = idx >> 8;
    > + int offset = idx & 0xff;
    > +
    > + spin_lock_irqsave(&data->reset_lock, flags);
    > +
    > + writel(BIT(offset), data->asset_base + (bank * 0x10));
    > +
    > + spin_unlock_irqrestore(&data->reset_lock, flags);
    > +
    > + 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);
    > +
    > + unsigned long flags;
    > + int bank = idx >> 8;
    > + int offset = idx & 0xff;
    > +
    > + spin_lock_irqsave(&data->reset_lock, flags);
    > +
    > + writel(BIT(offset), data->deasset_base + (bank * 0x10));
    > +
    > + spin_unlock_irqrestore(&data->reset_lock, flags);
    > +
    > + 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);
    > +
    > + spin_lock_init(&data->reset_lock);
    > +
    > + data->asset_base = src_base + ASSET_OFFSET;
    > + data->deasset_base = src_base + DEASSET_OFFSET;
    > + data->rc_dev.nr_resets = SZ_4K;

    use the max index of the reset bit

    > + 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_reset_ctl" },
    > + { },
    > +};
    > +
    > +static struct platform_driver hi6220_reset_driver = {
    > + .probe = hi6220_reset_probe,
    > + .driver = {
    > + .name = "reset-hi6220",
    > + .owner = THIS_MODULE,
    > + .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);
    >



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