^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Copyright (C) 2013-2015 ARM Limited, All Rights Reserved.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * Author: Marc Zyngier <marc.zyngier@arm.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) #include <linux/acpi_iort.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <linux/device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/msi.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/of.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/of_irq.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) static struct irq_chip its_pmsi_irq_chip = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) .name = "ITS-pMSI",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) static int of_pmsi_get_dev_id(struct irq_domain *domain, struct device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) u32 *dev_id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) int ret, index = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) /* Suck the DeviceID out of the msi-parent property */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) struct of_phandle_args args;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) ret = of_parse_phandle_with_args(dev->of_node,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) "msi-parent", "#msi-cells",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) index, &args);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) if (args.np == irq_domain_get_of_node(domain)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) if (WARN_ON(args.args_count != 1))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) *dev_id = args.args[0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) index++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) } while (!ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) int __weak iort_pmsi_get_dev_id(struct device *dev, u32 *dev_id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) static int its_pmsi_prepare(struct irq_domain *domain, struct device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) int nvec, msi_alloc_info_t *info)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) struct msi_domain_info *msi_info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) u32 dev_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) msi_info = msi_get_domain_info(domain->parent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) if (dev->of_node)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) ret = of_pmsi_get_dev_id(domain, dev, &dev_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) ret = iort_pmsi_get_dev_id(dev, &dev_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) /* ITS specific DeviceID, as the core ITS ignores dev. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) info->scratchpad[0].ul = dev_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) /* Allocate at least 32 MSIs, and always as a power of 2 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) nvec = max_t(int, 32, roundup_pow_of_two(nvec));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) return msi_info->ops->msi_prepare(domain->parent,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) dev, nvec, info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) static struct msi_domain_ops its_pmsi_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) .msi_prepare = its_pmsi_prepare,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) static struct msi_domain_info its_pmsi_domain_info = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) .flags = (MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) .ops = &its_pmsi_ops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) .chip = &its_pmsi_irq_chip,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) static const struct of_device_id its_device_id[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) { .compatible = "arm,gic-v3-its", },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) {},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) static int __init its_pmsi_init_one(struct fwnode_handle *fwnode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) const char *name)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) struct irq_domain *parent;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) parent = irq_find_matching_fwnode(fwnode, DOMAIN_BUS_NEXUS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) if (!parent || !msi_get_domain_info(parent)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) pr_err("%s: unable to locate ITS domain\n", name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) return -ENXIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) if (!platform_msi_create_irq_domain(fwnode, &its_pmsi_domain_info,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) parent)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) pr_err("%s: unable to create platform domain\n", name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) return -ENXIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) pr_info("Platform MSI: %s domain created\n", name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) #ifdef CONFIG_ACPI
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) static int __init
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) its_pmsi_parse_madt(union acpi_subtable_headers *header,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) const unsigned long end)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) struct acpi_madt_generic_translator *its_entry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) struct fwnode_handle *domain_handle;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) const char *node_name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) int err = -ENXIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) its_entry = (struct acpi_madt_generic_translator *)header;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) node_name = kasprintf(GFP_KERNEL, "ITS@0x%lx",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) (long)its_entry->base_address);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) domain_handle = iort_find_domain_token(its_entry->translation_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) if (!domain_handle) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) pr_err("%s: Unable to locate ITS domain handle\n", node_name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) err = its_pmsi_init_one(domain_handle, node_name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) kfree(node_name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) static void __init its_pmsi_acpi_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_TRANSLATOR,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) its_pmsi_parse_madt, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) static inline void its_pmsi_acpi_init(void) { }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) static void __init its_pmsi_of_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) struct device_node *np;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) for (np = of_find_matching_node(NULL, its_device_id); np;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) np = of_find_matching_node(np, its_device_id)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) if (!of_device_is_available(np))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) if (!of_property_read_bool(np, "msi-controller"))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) its_pmsi_init_one(of_node_to_fwnode(np), np->full_name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) static int __init its_pmsi_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) its_pmsi_of_init();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) its_pmsi_acpi_init();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) early_initcall(its_pmsi_init);
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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