diff options
author | Marc Zyngier <marc.zyngier@arm.com> | 2015-07-28 13:46:22 (GMT) |
---|---|---|
committer | Thomas Gleixner <tglx@linutronix.de> | 2015-07-29 22:14:38 (GMT) |
commit | 1e6db000482fa65a419d1776f9ae1ff919afe605 (patch) | |
tree | 36e5a98206d4c5e8d715ed5a1c2e4485f7a43b1d /drivers/irqchip | |
parent | 54456db9a23753b87ce4d49adabe7da853bf13a2 (diff) | |
download | linux-1e6db000482fa65a419d1776f9ae1ff919afe605.tar.xz |
irqchip/gicv3-its: Add platform MSI support
In order to support non-PCI MSI with the GICv3 ITS, add the minimal
required entry points for the MSI domain (an msi_prepare implementation).
The rest is only boilerplate code to find the raw ITS domain.
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Cc: <linux-arm-kernel@lists.infradead.org>
Cc: Yijing Wang <wangyijing@huawei.com>
Cc: Ma Jun <majun258@huawei.com>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: Duc Dang <dhdang@apm.com>
Cc: Hanjun Guo <hanjun.guo@linaro.org>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Jiang Liu <jiang.liu@linux.intel.com>
Cc: Jason Cooper <jason@lakedaemon.net>
Link: http://lkml.kernel.org/r/1438091186-10244-16-git-send-email-marc.zyngier@arm.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'drivers/irqchip')
-rw-r--r-- | drivers/irqchip/Makefile | 2 | ||||
-rw-r--r-- | drivers/irqchip/irq-gic-v3-its-platform-msi.c | 93 |
2 files changed, 94 insertions, 1 deletions
diff --git a/drivers/irqchip/Makefile b/drivers/irqchip/Makefile index 0d5f2a9..11d08c9 100644 --- a/drivers/irqchip/Makefile +++ b/drivers/irqchip/Makefile @@ -22,7 +22,7 @@ obj-$(CONFIG_ARCH_SPEAR3XX) += spear-shirq.o obj-$(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-$(CONFIG_ARM_GIC_V3_ITS) += irq-gic-v3-its.o irq-gic-v3-its-pci-msi.o +obj-$(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-$(CONFIG_ARM_NVIC) += irq-nvic.o obj-$(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-gic-v3-its-platform-msi.c b/drivers/irqchip/irq-gic-v3-its-platform-msi.c new file mode 100644 index 0000000..a865505 --- /dev/null +++ b/drivers/irqchip/irq-gic-v3-its-platform-msi.c @@ -0,0 +1,93 @@ +/* + * Copyright (C) 2013-2015 ARM Limited, All Rights Reserved. + * Author: Marc Zyngier <marc.zyngier@arm.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/device.h> +#include <linux/msi.h> +#include <linux/of.h> +#include <linux/of_irq.h> + +static struct irq_chip its_pmsi_irq_chip = { + .name = "ITS-pMSI", +}; + +static int its_pmsi_prepare(struct irq_domain *domain, struct device *dev, + int nvec, msi_alloc_info_t *info) +{ + struct msi_domain_info *msi_info; + u32 dev_id; + int ret; + + msi_info = msi_get_domain_info(domain->parent); + + /* Suck the DeviceID out of the msi-parent property */ + ret = of_property_read_u32_index(dev->of_node, "msi-parent", + 1, &dev_id); + if (ret) + return ret; + + /* ITS specific DeviceID, as the core ITS ignores dev. */ + info->scratchpad[0].ul = dev_id; + + return msi_info->ops->msi_prepare(domain->parent, + dev, nvec, info); +} + +static struct msi_domain_ops its_pmsi_ops = { + .msi_prepare = its_pmsi_prepare, +}; + +static struct msi_domain_info its_pmsi_domain_info = { + .flags = (MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS), + .ops = &its_pmsi_ops, + .chip = &its_pmsi_irq_chip, +}; + +static struct of_device_id its_device_id[] = { + { .compatible = "arm,gic-v3-its", }, + {}, +}; + +static int __init its_pmsi_init(void) +{ + struct device_node *np; + struct irq_domain *parent; + + for (np = of_find_matching_node(NULL, its_device_id); np; + np = of_find_matching_node(np, its_device_id)) { + if (!of_property_read_bool(np, "msi-controller")) + continue; + + parent = irq_find_matching_host(np, DOMAIN_BUS_NEXUS); + if (!parent || !msi_get_domain_info(parent)) { + pr_err("%s: unable to locate ITS domain\n", + np->full_name); + continue; + } + + if (!platform_msi_create_irq_domain(np, &its_pmsi_domain_info, + parent)) { + pr_err("%s: unable to create platform domain\n", + np->full_name); + continue; + } + + pr_info("Platform MSI: %s domain created\n", np->full_name); + } + + return 0; +} +early_initcall(its_pmsi_init); |