2 * Freescale Management Complex (MC) bus driver MSI support
4 * Copyright (C) 2015 Freescale Semiconductor, Inc.
5 * Author: German Rivera <German.Rivera@freescale.com>
7 * This file is licensed under the terms of the GNU General Public
8 * License version 2. This program is licensed "as is" without any
9 * warranty of any kind, whether express or implied.
12 #include <linux/of_device.h>
13 #include <linux/of_address.h>
14 #include <linux/irqchip/arm-gic-v3.h>
15 #include <linux/irq.h>
16 #include <linux/msi.h>
18 #include <linux/of_irq.h>
19 #include "../include/mc-bus.h"
20 #include "fsl-mc-private.h"
22 static struct irq_chip its_msi_irq_chip = {
23 .name = "fsl-mc-bus-msi",
24 .irq_mask = irq_chip_mask_parent,
25 .irq_unmask = irq_chip_unmask_parent,
26 .irq_eoi = irq_chip_eoi_parent,
27 .irq_set_affinity = msi_domain_set_affinity
30 static int its_fsl_mc_msi_prepare(struct irq_domain *msi_domain,
32 int nvec, msi_alloc_info_t *info)
34 struct fsl_mc_device *mc_bus_dev;
35 struct msi_domain_info *msi_info;
37 if (WARN_ON(!dev_is_fsl_mc(dev)))
40 mc_bus_dev = to_fsl_mc_device(dev);
41 if (WARN_ON(!(mc_bus_dev->flags & FSL_MC_IS_DPRC)))
45 * Set the device Id to be passed to the GIC-ITS:
47 * NOTE: This device id corresponds to the IOMMU stream ID
48 * associated with the DPRC object (ICID).
50 info->scratchpad[0].ul = mc_bus_dev->icid;
51 msi_info = msi_get_domain_info(msi_domain->parent);
52 return msi_info->ops->msi_prepare(msi_domain->parent, dev, nvec, info);
55 static struct msi_domain_ops its_fsl_mc_msi_ops = {
56 .msi_prepare = its_fsl_mc_msi_prepare,
59 static struct msi_domain_info its_fsl_mc_msi_domain_info = {
60 .flags = (MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS),
61 .ops = &its_fsl_mc_msi_ops,
62 .chip = &its_msi_irq_chip,
65 static const struct of_device_id its_device_id[] = {
66 { .compatible = "arm,gic-v3-its", },
70 int __init its_fsl_mc_msi_init(void)
72 struct device_node *np;
73 struct irq_domain *parent;
74 struct irq_domain *mc_msi_domain;
76 for (np = of_find_matching_node(NULL, its_device_id); np;
77 np = of_find_matching_node(np, its_device_id)) {
78 if (!of_device_is_available(np))
80 if (!of_property_read_bool(np, "msi-controller"))
83 parent = irq_find_matching_host(np, DOMAIN_BUS_NEXUS);
84 if (!parent || !msi_get_domain_info(parent)) {
85 pr_err("%s: unable to locate ITS domain\n",
90 mc_msi_domain = fsl_mc_msi_create_irq_domain(
91 of_node_to_fwnode(np),
92 &its_fsl_mc_msi_domain_info,
95 pr_err("%s: unable to create fsl-mc domain\n",
100 WARN_ON(mc_msi_domain->
101 host_data != &its_fsl_mc_msi_domain_info);
103 pr_info("fsl-mc MSI: %s domain created\n", np->full_name);
109 void its_fsl_mc_msi_cleanup(void)
111 struct device_node *np;
113 for (np = of_find_matching_node(NULL, its_device_id); np;
114 np = of_find_matching_node(np, its_device_id)) {
115 struct irq_domain *mc_msi_domain = irq_find_matching_host(
117 DOMAIN_BUS_FSL_MC_MSI);
119 if (!of_property_read_bool(np, "msi-controller"))
123 mc_msi_domain->host_data == &its_fsl_mc_msi_domain_info)
124 irq_domain_remove(mc_msi_domain);