1 // SPDX-License-Identifier: GPL-2.0
3  * PCI Endpoint *Controller* (EPC) MSI library
15 #include <linux/pci-epc.h>
16 #include <linux/pci-epf.h>
17 #include <linux/pci-ep-cfs.h>
18 #include <linux/pci-ep-msi.h>
30 	epf = list_first_entry_or_null(&epc->pci_epf, struct pci_epf, list);  in pci_epf_write_msi_msg()
32 	if (epf && epf->db_msg && desc->msi_index < epf->num_db)  in pci_epf_write_msi_msg()
33 		memcpy(&epf->db_msg[desc->msi_index].msg, msg, sizeof(*msg));  in pci_epf_write_msi_msg()
40 	struct pci_epc *epc = epf->epc;  in pci_epf_alloc_doorbell()
41 	struct device *dev = &epf->dev;  in pci_epf_alloc_doorbell()
42 	struct irq_domain *domain;  in pci_epf_alloc_doorbell()  local
47 	/* TODO: Multi-EPF support */  in pci_epf_alloc_doorbell()
48 	if (list_first_entry_or_null(&epc->pci_epf, struct pci_epf, list) != epf) {  in pci_epf_alloc_doorbell()
50 		return -EINVAL;  in pci_epf_alloc_doorbell()
53 	domain = of_msi_map_get_device_domain(epc->dev.parent, 0,  in pci_epf_alloc_doorbell()
55 	if (!domain) {  in pci_epf_alloc_doorbell()
56 		dev_err(dev, "Can't find MSI domain for EPC\n");  in pci_epf_alloc_doorbell()
57 		return -ENODEV;  in pci_epf_alloc_doorbell()
60 	if (!irq_domain_is_msi_parent(domain))  in pci_epf_alloc_doorbell()
61 		return -ENODEV;  in pci_epf_alloc_doorbell()
63 	if (!irq_domain_is_msi_immutable(domain)) {  in pci_epf_alloc_doorbell()
65 		return -ENODEV;  in pci_epf_alloc_doorbell()
68 	dev_set_msi_domain(epc->dev.parent, domain);  in pci_epf_alloc_doorbell()
72 		return -ENOMEM;  in pci_epf_alloc_doorbell()
74 	epf->num_db = num_db;  in pci_epf_alloc_doorbell()
75 	epf->db_msg = msg;  in pci_epf_alloc_doorbell()
77 	ret = platform_device_msi_init_and_alloc_irqs(epc->dev.parent, num_db,  in pci_epf_alloc_doorbell()
86 		epf->db_msg[i].virq = msi_get_virq(epc->dev.parent, i);  in pci_epf_alloc_doorbell()
94 	platform_device_msi_free_irqs_all(epf->epc->dev.parent);  in pci_epf_free_doorbell()
96 	kfree(epf->db_msg);  in pci_epf_free_doorbell()
97 	epf->db_msg = NULL;  in pci_epf_free_doorbell()
98 	epf->num_db = 0;  in pci_epf_free_doorbell()