From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1760666AbbLCQWa (ORCPT ); Thu, 3 Dec 2015 11:22:30 -0500 Received: from foss.arm.com ([217.140.101.70]:50038 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752355AbbLCQW3 (ORCPT ); Thu, 3 Dec 2015 11:22:29 -0500 Message-ID: <56606C3F.5050000@arm.com> Date: Thu, 03 Dec 2015 16:22:23 +0000 From: Marc Zyngier Organization: ARM Ltd User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Icedove/31.7.0 MIME-Version: 1.0 To: MaJun , Catalin.Marinas@arm.com, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Will.Deacon@arm.com, mark.rutland@arm.com, jason@lakedaemon.net, tglx@linutronix.de, lizefan@huawei.com, huxinwei@huawei.com, dingtianhong@huawei.com, zhaojunhua@hisilicon.com, liguozhu@hisilicon.com, xuwei5@hisilicon.com, wei.chenwei@hisilicon.com, guohanjun@huawei.com, wuyun.wu@huawei.com, guodong.xu@linaro.org, haojian.zhuang@linaro.org, zhangfei.gao@linaro.org, usman.ahmad@linaro.org, klimov.linux@gmail.com, gabriele.paoloni@huawei.com Subject: Re: [PATCH v9 2/4] irqchip: add platform device driver for mbigen device References: <1448248513-39760-1-git-send-email-majun258@huawei.com> <1448248513-39760-3-git-send-email-majun258@huawei.com> In-Reply-To: <1448248513-39760-3-git-send-email-majun258@huawei.com> Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 23/11/15 03:15, MaJun wrote: > From: Ma Jun > > 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 > --- > drivers/irqchip/Kconfig | 8 ++++ > drivers/irqchip/Makefile | 1 + > drivers/irqchip/irq-mbigen.c | 78 ++++++++++++++++++++++++++++++++++++++++++ > 3 files changed, 87 insertions(+), 0 deletions(-) > create mode 100644 drivers/irqchip/irq-mbigen.c > > diff --git a/drivers/irqchip/Kconfig b/drivers/irqchip/Kconfig > index 4d7294e..b205e15 100644 > --- a/drivers/irqchip/Kconfig > +++ b/drivers/irqchip/Kconfig > @@ -27,6 +27,14 @@ config ARM_GIC_V3_ITS > bool > select PCI_MSI_IRQ_DOMAIN > > +config HISILICON_IRQ_MBIGEN > + bool "Support mbigen interrupt controller" > + default n > + depends on ARM_GIC_V3 && ARM_GIC_V3_ITS && GENERIC_MSI_IRQ_DOMAIN > + help > + Enable the mbigen interrupt controller used on > + Hisilicon platform. > + > config ARM_NVIC > bool > select IRQ_DOMAIN > diff --git a/drivers/irqchip/Makefile b/drivers/irqchip/Makefile > index 177f78f..cd76b11 100644 > --- a/drivers/irqchip/Makefile > +++ b/drivers/irqchip/Makefile > @@ -24,6 +24,7 @@ obj-$(CONFIG_ARM_GIC) += irq-gic.o irq-gic-common.o > obj-$(CONFIG_ARM_GIC_V2M) += irq-gic-v2m.o > obj-$(CONFIG_ARM_GIC_V3) += irq-gic-v3.o irq-gic-common.o > obj-$(CONFIG_ARM_GIC_V3_ITS) += irq-gic-v3-its.o irq-gic-v3-its-pci-msi.o irq-gic-v3-its-platform-msi.o > +obj-$(CONFIG_HISILICON_IRQ_MBIGEN) += irq-mbigen.o > obj-$(CONFIG_ARM_NVIC) += irq-nvic.o > obj-$(CONFIG_ARM_VIC) += irq-vic.o > obj-$(CONFIG_ATMEL_AIC_IRQ) += irq-atmel-aic-common.o irq-atmel-aic.o > diff --git a/drivers/irqchip/irq-mbigen.c b/drivers/irqchip/irq-mbigen.c > new file mode 100644 > index 0000000..9f036c2 > --- /dev/null > +++ b/drivers/irqchip/irq-mbigen.c > @@ -0,0 +1,78 @@ > +/* > + * Copyright (C) 2015 Hisilicon Limited, All Rights Reserved. > + * Author: Jun Ma > + * Author: Yun Wu > + * > + * 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 . > + */ > + > +#include > +#include > +#include > +#include > +#include > +#include > + > +/** > + * 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; > + struct resource *res; > + > + mgn_chip = devm_kzalloc(&pdev->dev, sizeof(*mgn_chip), GFP_KERNEL); > + if (!mgn_chip) > + return -ENOMEM; > + > + mgn_chip->pdev = pdev; > + > + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); > + mgn_chip->base = devm_ioremap_resource(&pdev->dev, res); > + if (IS_ERR(mgn_chip->base)) > + return PTR_ERR(mgn_chip->base); > + > + platform_set_drvdata(pdev, mgn_chip); > + > + 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, > +}; > + > +module_platform_driver(mbigen_platform_driver); > + > +MODULE_AUTHOR("Jun Ma "); > +MODULE_AUTHOR("Yun Wu "); > +MODULE_LICENSE("GPL"); > +MODULE_DESCRIPTION("Hisilicon MBI Generator driver"); > Reviewed-by: Marc Zyngier M. -- Jazz is not dead. It just smells funny...