2 * Freescale Management Complex (MC) bus driver MSI support
4 * Copyright (C) 2015-2016 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"
21 static struct irq_chip its_msi_irq_chip = {
23 .irq_mask = irq_chip_mask_parent,
24 .irq_unmask = irq_chip_unmask_parent,
25 .irq_eoi = irq_chip_eoi_parent,
26 .irq_set_affinity = msi_domain_set_affinity
29 static int its_fsl_mc_msi_prepare(struct irq_domain *msi_domain,
31 int nvec, msi_alloc_info_t *info)
33 struct fsl_mc_device *mc_bus_dev;
34 struct msi_domain_info *msi_info;
36 if (WARN_ON(!dev_is_fsl_mc(dev)))
39 mc_bus_dev = to_fsl_mc_device(dev);
40 if (WARN_ON(!(mc_bus_dev->flags & FSL_MC_IS_DPRC)))
44 * Set the device Id to be passed to the GIC-ITS:
46 * NOTE: This device id corresponds to the IOMMU stream ID
47 * associated with the DPRC object (ICID).
49 info->scratchpad[0].ul = mc_bus_dev->icid;
50 msi_info = msi_get_domain_info(msi_domain->parent);
51 return msi_info->ops->msi_prepare(msi_domain->parent, dev, nvec, info);
54 static struct msi_domain_ops its_fsl_mc_msi_ops = {
55 .msi_prepare = its_fsl_mc_msi_prepare,
58 static struct msi_domain_info its_fsl_mc_msi_domain_info = {
59 .flags = (MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS),
60 .ops = &its_fsl_mc_msi_ops,
61 .chip = &its_msi_irq_chip,
64 static const struct of_device_id its_device_id[] = {
65 { .compatible = "arm,gic-v3-its", },
69 int __init its_fsl_mc_msi_init(void)
71 struct device_node *np;
72 struct irq_domain *parent;
73 struct irq_domain *mc_msi_domain;
75 for (np = of_find_matching_node(NULL, its_device_id); np;
76 np = of_find_matching_node(np, its_device_id)) {
77 if (!of_property_read_bool(np, "msi-controller"))
80 parent = irq_find_matching_host(np, DOMAIN_BUS_NEXUS);
81 if (!parent || !msi_get_domain_info(parent)) {
82 pr_err("%s: unable to locate ITS domain\n",
87 mc_msi_domain = fsl_mc_msi_create_irq_domain(
88 of_node_to_fwnode(np),
89 &its_fsl_mc_msi_domain_info,
92 pr_err("%s: unable to create fsl-mc domain\n",
97 WARN_ON(mc_msi_domain->
98 host_data != &its_fsl_mc_msi_domain_info);
100 pr_info("fsl-mc MSI: %s domain created\n", np->full_name);
106 void its_fsl_mc_msi_cleanup(void)
108 struct device_node *np;
110 for (np = of_find_matching_node(NULL, its_device_id); np;
111 np = of_find_matching_node(np, its_device_id)) {
112 struct irq_domain *mc_msi_domain = irq_find_matching_host(
114 DOMAIN_BUS_FSL_MC_MSI);
116 if (!of_property_read_bool(np, "msi-controller"))
120 mc_msi_domain->host_data == &its_fsl_mc_msi_domain_info)
121 irq_domain_remove(mc_msi_domain);