1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Texas Instruments' K3 Interrupt Aggregator MSI bus 4 * 5 * Copyright (C) 2018-2019 Texas Instruments Incorporated - http://www.ti.com/ 6 * Lokesh Vutla <lokeshvutla@ti.com> 7 */ 8 9 #include <linux/irq.h> 10 #include <linux/irqdomain.h> 11 #include <linux/msi.h> 12 #include <linux/of_address.h> 13 #include <linux/of_device.h> 14 #include <linux/of_irq.h> 15 #include <linux/soc/ti/ti_sci_inta_msi.h> 16 #include <linux/soc/ti/ti_sci_protocol.h> 17 18 static void ti_sci_inta_msi_write_msg(struct irq_data *data, 19 struct msi_msg *msg) 20 { 21 /* Nothing to do */ 22 } 23 24 static void ti_sci_inta_msi_compose_msi_msg(struct irq_data *data, 25 struct msi_msg *msg) 26 { 27 /* Nothing to do */ 28 } 29 30 static void ti_sci_inta_msi_update_chip_ops(struct msi_domain_info *info) 31 { 32 struct irq_chip *chip = info->chip; 33 34 if (WARN_ON(!chip)) 35 return; 36 37 chip->irq_request_resources = irq_chip_request_resources_parent; 38 chip->irq_release_resources = irq_chip_release_resources_parent; 39 chip->irq_compose_msi_msg = ti_sci_inta_msi_compose_msi_msg; 40 chip->irq_write_msi_msg = ti_sci_inta_msi_write_msg; 41 chip->irq_set_type = irq_chip_set_type_parent; 42 chip->irq_unmask = irq_chip_unmask_parent; 43 chip->irq_mask = irq_chip_mask_parent; 44 chip->irq_ack = irq_chip_ack_parent; 45 } 46 47 struct irq_domain *ti_sci_inta_msi_create_irq_domain(struct fwnode_handle *fwnode, 48 struct msi_domain_info *info, 49 struct irq_domain *parent) 50 { 51 struct irq_domain *domain; 52 53 ti_sci_inta_msi_update_chip_ops(info); 54 55 domain = msi_create_irq_domain(fwnode, info, parent); 56 if (domain) 57 irq_domain_update_bus_token(domain, DOMAIN_BUS_TI_SCI_INTA_MSI); 58 59 return domain; 60 } 61 EXPORT_SYMBOL_GPL(ti_sci_inta_msi_create_irq_domain); 62 63 static void ti_sci_inta_msi_free_descs(struct device *dev) 64 { 65 struct msi_desc *desc, *tmp; 66 67 list_for_each_entry_safe(desc, tmp, dev_to_msi_list(dev), list) { 68 list_del(&desc->list); 69 free_msi_entry(desc); 70 } 71 } 72 73 static int ti_sci_inta_msi_alloc_descs(struct device *dev, 74 struct ti_sci_resource *res) 75 { 76 struct msi_desc *msi_desc; 77 int set, i, count = 0; 78 79 for (set = 0; set < res->sets; set++) { 80 for (i = 0; i < res->desc[set].num; i++) { 81 msi_desc = alloc_msi_entry(dev, 1, NULL); 82 if (!msi_desc) { 83 ti_sci_inta_msi_free_descs(dev); 84 return -ENOMEM; 85 } 86 87 msi_desc->inta.dev_index = res->desc[set].start + i; 88 INIT_LIST_HEAD(&msi_desc->list); 89 list_add_tail(&msi_desc->list, dev_to_msi_list(dev)); 90 count++; 91 } 92 } 93 94 return count; 95 } 96 97 int ti_sci_inta_msi_domain_alloc_irqs(struct device *dev, 98 struct ti_sci_resource *res) 99 { 100 struct platform_device *pdev = to_platform_device(dev); 101 struct irq_domain *msi_domain; 102 int ret, nvec; 103 104 msi_domain = dev_get_msi_domain(dev); 105 if (!msi_domain) 106 return -EINVAL; 107 108 if (pdev->id < 0) 109 return -ENODEV; 110 111 nvec = ti_sci_inta_msi_alloc_descs(dev, res); 112 if (nvec <= 0) 113 return nvec; 114 115 ret = msi_domain_alloc_irqs(msi_domain, dev, nvec); 116 if (ret) { 117 dev_err(dev, "Failed to allocate IRQs %d\n", ret); 118 goto cleanup; 119 } 120 121 return 0; 122 123 cleanup: 124 ti_sci_inta_msi_free_descs(&pdev->dev); 125 return ret; 126 } 127 EXPORT_SYMBOL_GPL(ti_sci_inta_msi_domain_alloc_irqs); 128 129 void ti_sci_inta_msi_domain_free_irqs(struct device *dev) 130 { 131 msi_domain_free_irqs(dev->msi_domain, dev); 132 ti_sci_inta_msi_free_descs(dev); 133 } 134 EXPORT_SYMBOL_GPL(ti_sci_inta_msi_domain_free_irqs); 135 136 unsigned int ti_sci_inta_msi_get_virq(struct device *dev, u32 dev_index) 137 { 138 struct msi_desc *desc; 139 140 for_each_msi_entry(desc, dev) 141 if (desc->inta.dev_index == dev_index) 142 return desc->irq; 143 144 return -ENODEV; 145 } 146 EXPORT_SYMBOL_GPL(ti_sci_inta_msi_get_virq); 147