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Message-ID: <562620A5.5080603@huawei.com>
Date: Tue, 20 Oct 2015 19:08:21 +0800
From: "majun (F)" <majun258@...wei.com>
To: <Catalin.Marinas@....com>, <linux-kernel@...r.kernel.org>,
<linux-arm-kernel@...ts.infradead.org>, <Will.Deacon@....com>,
<mark.rutland@....com>, <marc.zyngier@....com>,
<jason@...edaemon.net>, <tglx@...utronix.de>, <lizefan@...wei.com>,
<huxinwei@...wei.com>, <dingtianhong@...wei.com>,
<zhaojunhua@...ilicon.com>, <liguozhu@...ilicon.com>,
<xuwei5@...ilicon.com>, <wei.chenwei@...ilicon.com>,
<guohanjun@...wei.com>, <wuyun.wu@...wei.com>,
<guodong.xu@...aro.org>, <haojian.zhuang@...aro.org>,
<zhangfei.gao@...aro.org>, <usman.ahmad@...aro.org>,
<klimov.linux@...il.com>, <gabriele.paoloni@...wei.com>
Subject: Re: [PATCH v6 2/4] irqchip: add platform device driver for mbigen
device
Sorry, I missed Makefile and Kconfig file in this patch.
I will re-send this patch set.
在 2015/10/20 16:41, MaJun 写道:
> From: Ma Jun <majun258@...wei.com>
>
> Mbigen means Message Based Interrupt Generator(MBIGEN).
>
> Its a kind of interrupt controller that collects
> the interrupts from external devices and generate msi interrupt.
> Mbigen is applied to reduce the number of wire connected interrupts.
>
> As the peripherals increasing, the interrupts lines needed is
> increasing much, especially on the Arm64 server SOC.
>
> Therefore, the interrupt pin in GIC is not enough to cover so
> many peripherals.
>
> Mbigen is designed to fix this problem.
>
> Mbigen chip locates in ITS or outside of ITS.
>
> Mbigen chip hardware structure shows as below:
>
> mbigen chip
> |---------------------|-------------------|
> mgn_node0 mgn_node1 mgn_node2
> | |-------| |-------|------|
> dev1 dev1 dev2 dev1 dev3 dev4
>
> Each mbigen chip contains several mbigen nodes.
>
> External devices can connect to mbigen node through wire connecting way.
>
> Because a mbigen node only can support 128 interrupt maximum, depends
> on the interrupt lines number of devices, a device can connects to one
> more mbigen nodes.
>
> Also, several different devices can connect to a same mbigen node.
>
> When devices triggered interrupt,mbigen chip detects and collects
> the interrupts and generates the MBI interrupts by writing the ITS
> Translator register.
>
> To simplify mbigen driver,I used a new conception--mbigen device.
> Each mbigen device is initialized as a platform device.
>
> Mbigen device presents the parts(register, pin definition etc.) in
> mbigen chip corresponding to a peripheral device.
>
> So from software view, the structure likes below
>
> mbigen chip
> |---------------------|-----------------|
> mbigen device1 mbigen device2 mbigen device3
> | | |
> dev1 dev2 dev3
>
> Signed-off-by: Ma Jun <majun258@...wei.com>
> ---
> drivers/irqchip/irq-mbigen.c | 83 ++++++++++++++++++++++++++++++++++++++++++
> 1 files changed, 83 insertions(+), 0 deletions(-)
> create mode 100644 drivers/irqchip/irq-mbigen.c
>
> diff --git a/drivers/irqchip/irq-mbigen.c b/drivers/irqchip/irq-mbigen.c
> new file mode 100644
> index 0000000..f18132f
> --- /dev/null
> +++ b/drivers/irqchip/irq-mbigen.c
> @@ -0,0 +1,83 @@
> +/*
> + * Copyright (C) 2015 Hisilicon Limited, All Rights Reserved.
> + * Author: Jun Ma <majun258@...wei.com>
> + * Author: Yun Wu <wuyun.wu@...wei.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.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program. If not, see <http://www.gnu.org/licenses/>.
> + */
> +
> +#include <linux/module.h>
> +#include <linux/of_address.h>
> +#include <linux/of_irq.h>
> +#include <linux/of_platform.h>
> +#include <linux/platform_device.h>
> +#include <linux/slab.h>
> +
> +/**
> + * struct mbigen_device - holds the information of mbigen device.
> + *
> + * @pdev: pointer to the platform device structure of mbigen chip.
> + * @base: mapped address of this mbigen chip.
> + */
> +struct mbigen_device {
> + struct platform_device *pdev;
> + void __iomem *base;
> +};
> +
> +static int mbigen_device_probe(struct platform_device *pdev)
> +{
> + struct mbigen_device *mgn_chip;
> +
> + mgn_chip = devm_kzalloc(&pdev->dev, sizeof(*mgn_chip), GFP_KERNEL);
> + if (!mgn_chip)
> + return -ENOMEM;
> +
> + mgn_chip->pdev = pdev;
> + mgn_chip->base = of_iomap(pdev->dev.of_node, 0);
> +
> + platform_set_drvdata(pdev, mgn_chip);
> +
> + return 0;
> +}
> +
> +static int mbigen_device_remove(struct platform_device *pdev)
> +{
> + struct mbigen_device *mgn_chip = platform_get_drvdata(pdev);
> +
> + iounmap(mgn_chip->base);
> +
> + return 0;
> +}
> +
> +static const struct of_device_id mbigen_of_match[] = {
> + { .compatible = "hisilicon,mbigen-v2" },
> + { /* END */ }
> +};
> +MODULE_DEVICE_TABLE(of, mbigen_of_match);
> +
> +static struct platform_driver mbigen_platform_driver = {
> + .driver = {
> + .name = "Hisilicon MBIGEN-V2",
> + .owner = THIS_MODULE,
> + .of_match_table = mbigen_of_match,
> + },
> + .probe = mbigen_device_probe,
> + .remove = mbigen_device_remove,
> +};
> +
> +module_platform_driver(mbigen_platform_driver);
> +
> +MODULE_AUTHOR("Jun Ma <majun258@...wei.com>");
> +MODULE_AUTHOR("Yun Wu <wuyun.wu@...wei.com>");
> +MODULE_LICENSE("GPL");
> +MODULE_DESCRIPTION("Hisilicon MBI Generator driver");
>
--
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