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170 lines
4.2 KiB
170 lines
4.2 KiB
// 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 <[email protected]> |
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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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