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- // SPDX-License-Identifier: GPL-2.0
- /*
- * Freescale Management Complex (MC) bus driver MSI support
- *
- * Copyright (C) 2015-2016 Freescale Semiconductor, Inc.
- * Author: German Rivera <German.Rivera@freescale.com>
- *
- */
- #include <linux/of_device.h>
- #include <linux/of_address.h>
- #include <linux/irq.h>
- #include <linux/msi.h>
- #include <linux/of.h>
- #include <linux/of_irq.h>
- #include <linux/fsl/mc.h>
- static struct irq_chip its_msi_irq_chip = {
- .name = "ITS-fMSI",
- .irq_mask = irq_chip_mask_parent,
- .irq_unmask = irq_chip_unmask_parent,
- .irq_eoi = irq_chip_eoi_parent,
- .irq_set_affinity = msi_domain_set_affinity
- };
- static int its_fsl_mc_msi_prepare(struct irq_domain *msi_domain,
- struct device *dev,
- int nvec, msi_alloc_info_t *info)
- {
- struct fsl_mc_device *mc_bus_dev;
- struct msi_domain_info *msi_info;
- if (!dev_is_fsl_mc(dev))
- return -EINVAL;
- mc_bus_dev = to_fsl_mc_device(dev);
- if (!(mc_bus_dev->flags & FSL_MC_IS_DPRC))
- return -EINVAL;
- /*
- * Set the device Id to be passed to the GIC-ITS:
- *
- * NOTE: This device id corresponds to the IOMMU stream ID
- * associated with the DPRC object (ICID).
- */
- info->scratchpad[0].ul = mc_bus_dev->icid;
- msi_info = msi_get_domain_info(msi_domain->parent);
- /* Allocate at least 32 MSIs, and always as a power of 2 */
- nvec = max_t(int, 32, roundup_pow_of_two(nvec));
- return msi_info->ops->msi_prepare(msi_domain->parent, dev, nvec, info);
- }
- static struct msi_domain_ops its_fsl_mc_msi_ops __ro_after_init = {
- .msi_prepare = its_fsl_mc_msi_prepare,
- };
- static struct msi_domain_info its_fsl_mc_msi_domain_info = {
- .flags = (MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS),
- .ops = &its_fsl_mc_msi_ops,
- .chip = &its_msi_irq_chip,
- };
- static const struct of_device_id its_device_id[] = {
- { .compatible = "arm,gic-v3-its", },
- {},
- };
- static int __init its_fsl_mc_msi_init(void)
- {
- struct device_node *np;
- struct irq_domain *parent;
- struct irq_domain *mc_msi_domain;
- for (np = of_find_matching_node(NULL, its_device_id); np;
- np = of_find_matching_node(np, its_device_id)) {
- if (!of_device_is_available(np))
- continue;
- 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("%pOF: unable to locate ITS domain\n", np);
- continue;
- }
- mc_msi_domain = fsl_mc_msi_create_irq_domain(
- of_node_to_fwnode(np),
- &its_fsl_mc_msi_domain_info,
- parent);
- if (!mc_msi_domain) {
- pr_err("%pOF: unable to create fsl-mc domain\n", np);
- continue;
- }
- pr_info("fsl-mc MSI: %pOF domain created\n", np);
- }
- return 0;
- }
- early_initcall(its_fsl_mc_msi_init);
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