171 lines
4.2 KiB
C
171 lines
4.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Freescale Management Complex (MC) bus driver MSI support
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*
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* Copyright (C) 2015-2016 Freescale Semiconductor, Inc.
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* Author: German Rivera <German.Rivera@freescale.com>
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*
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*/
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#include <linux/acpi.h>
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#include <linux/acpi_iort.h>
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#include <linux/of_device.h>
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#include <linux/of_address.h>
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#include <linux/irq.h>
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#include <linux/msi.h>
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#include <linux/of.h>
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#include <linux/of_irq.h>
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#include <linux/fsl/mc.h>
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static struct irq_chip its_msi_irq_chip = {
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.name = "ITS-fMSI",
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.irq_mask = irq_chip_mask_parent,
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.irq_unmask = irq_chip_unmask_parent,
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.irq_eoi = irq_chip_eoi_parent,
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.irq_set_affinity = msi_domain_set_affinity
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};
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static u32 fsl_mc_msi_domain_get_msi_id(struct irq_domain *domain,
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struct fsl_mc_device *mc_dev)
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{
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struct device_node *of_node;
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u32 out_id;
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of_node = irq_domain_get_of_node(domain);
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out_id = of_node ? of_msi_map_id(&mc_dev->dev, of_node, mc_dev->icid) :
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iort_msi_map_id(&mc_dev->dev, mc_dev->icid);
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return out_id;
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}
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static int its_fsl_mc_msi_prepare(struct irq_domain *msi_domain,
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struct device *dev,
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int nvec, msi_alloc_info_t *info)
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{
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struct fsl_mc_device *mc_bus_dev;
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struct msi_domain_info *msi_info;
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if (!dev_is_fsl_mc(dev))
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return -EINVAL;
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mc_bus_dev = to_fsl_mc_device(dev);
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if (!(mc_bus_dev->flags & FSL_MC_IS_DPRC))
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return -EINVAL;
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/*
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* Set the device Id to be passed to the GIC-ITS:
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*
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* NOTE: This device id corresponds to the IOMMU stream ID
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* associated with the DPRC object (ICID).
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*/
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info->scratchpad[0].ul = fsl_mc_msi_domain_get_msi_id(msi_domain,
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mc_bus_dev);
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msi_info = msi_get_domain_info(msi_domain->parent);
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/* Allocate at least 32 MSIs, and always as a power of 2 */
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nvec = max_t(int, 32, roundup_pow_of_two(nvec));
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return msi_info->ops->msi_prepare(msi_domain->parent, dev, nvec, info);
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}
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static struct msi_domain_ops its_fsl_mc_msi_ops __ro_after_init = {
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.msi_prepare = its_fsl_mc_msi_prepare,
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};
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static struct msi_domain_info its_fsl_mc_msi_domain_info = {
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.flags = (MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS),
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.ops = &its_fsl_mc_msi_ops,
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.chip = &its_msi_irq_chip,
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};
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static const struct of_device_id its_device_id[] = {
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{ .compatible = "arm,gic-v3-its", },
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{},
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};
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static void __init its_fsl_mc_msi_init_one(struct fwnode_handle *handle,
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const char *name)
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{
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struct irq_domain *parent;
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struct irq_domain *mc_msi_domain;
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parent = irq_find_matching_fwnode(handle, DOMAIN_BUS_NEXUS);
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if (!parent || !msi_get_domain_info(parent)) {
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pr_err("%s: unable to locate ITS domain\n", name);
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return;
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}
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mc_msi_domain = fsl_mc_msi_create_irq_domain(handle,
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&its_fsl_mc_msi_domain_info,
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parent);
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if (!mc_msi_domain) {
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pr_err("%s: unable to create fsl-mc domain\n", name);
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return;
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}
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pr_info("fsl-mc MSI: %s domain created\n", name);
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}
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#ifdef CONFIG_ACPI
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static int __init
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its_fsl_mc_msi_parse_madt(union acpi_subtable_headers *header,
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const unsigned long end)
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{
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struct acpi_madt_generic_translator *its_entry;
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struct fwnode_handle *dom_handle;
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const char *node_name;
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int err = 0;
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its_entry = (struct acpi_madt_generic_translator *)header;
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node_name = kasprintf(GFP_KERNEL, "ITS@0x%lx",
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(long)its_entry->base_address);
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dom_handle = iort_find_domain_token(its_entry->translation_id);
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if (!dom_handle) {
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pr_err("%s: Unable to locate ITS domain handle\n", node_name);
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err = -ENXIO;
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goto out;
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}
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its_fsl_mc_msi_init_one(dom_handle, node_name);
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out:
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kfree(node_name);
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return err;
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}
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static void __init its_fsl_mc_acpi_msi_init(void)
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{
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acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_TRANSLATOR,
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its_fsl_mc_msi_parse_madt, 0);
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}
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#else
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static inline void its_fsl_mc_acpi_msi_init(void) { }
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#endif
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static void __init its_fsl_mc_of_msi_init(void)
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{
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struct device_node *np;
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for (np = of_find_matching_node(NULL, its_device_id); np;
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np = of_find_matching_node(np, its_device_id)) {
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if (!of_device_is_available(np))
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continue;
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if (!of_property_read_bool(np, "msi-controller"))
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continue;
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its_fsl_mc_msi_init_one(of_node_to_fwnode(np),
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np->full_name);
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}
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}
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static int __init its_fsl_mc_msi_init(void)
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{
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its_fsl_mc_of_msi_init();
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its_fsl_mc_acpi_msi_init();
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return 0;
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}
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early_initcall(its_fsl_mc_msi_init);
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