| Message ID | 1446798522-28000-3-git-send-email-majun258@huawei.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On 06/11/15 08:28, MaJun wrote: > From: Ma Jun <majun258@huawei.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@huawei.com> > --- > drivers/irqchip/Kconfig | 8 ++++ > drivers/irqchip/Makefile | 1 + > drivers/irqchip/irq-mbigen.c | 73 ++++++++++++++++++++++++++++++++++++++++++ > 3 files changed, 82 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..25e4000 > --- /dev/null > +++ b/drivers/irqchip/irq-mbigen.c > @@ -0,0 +1,73 @@ > +/* > + * Copyright (C) 2015 Hisilicon Limited, All Rights Reserved. > + * Author: Jun Ma <majun258@huawei.com> > + * Author: Yun Wu <wuyun.wu@huawei.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); > + If you're going to use the devm_* stuff for your allocations, you might as well use devm_ioremap_resource as a matter of consistency. And checking the return value is not superfluous. > + 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 <majun258@huawei.com>"); > +MODULE_AUTHOR("Yun Wu <wuyun.wu@huawei.com>"); > +MODULE_LICENSE("GPL"); > +MODULE_DESCRIPTION("Hisilicon MBI Generator driver"); > Thanks, M.
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..25e4000 --- /dev/null +++ b/drivers/irqchip/irq-mbigen.c @@ -0,0 +1,73 @@ +/* + * Copyright (C) 2015 Hisilicon Limited, All Rights Reserved. + * Author: Jun Ma <majun258@huawei.com> + * Author: Yun Wu <wuyun.wu@huawei.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 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 <majun258@huawei.com>"); +MODULE_AUTHOR("Yun Wu <wuyun.wu@huawei.com>"); +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("Hisilicon MBI Generator driver");