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>

diff --git a/drivers/irqchip/Makefile b/drivers/irqchip/Makefile
index 0d5f2a98a6ef3b5d9b45843d55bd1ab7630214ea..11d08c9a072463de3785285b3b959398b8b898fe 100644 (file)
--- 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 (file)
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);