1 // SPDX-License-Identifier: GPL-2.0-only
4  * Copyright 2006-2007, Michael Ellerman, IBM Corporation.
8 #include <linux/msi.h>
12 #include <asm/ppc-pci.h>
39 	.name			= "MPIC-U3MSI",
66 	for (bus = pdev->bus; bus && bus->self; bus = bus->parent) {  in find_ht_magic_addr()
67 		pos = pci_find_ht_capability(bus->self, HT_CAPTYPE_MSI_MAPPING);  in find_ht_magic_addr()
69 			return read_ht_magic_addr(bus->self, pos);  in find_ht_magic_addr()
77 	struct pci_controller *hose = pci_bus_to_host(pdev->bus);  in find_u4_magic_addr()
82 	 * the MSI number and that triggers the right interrupt, but  in find_u4_magic_addr()
90 	 * This will not work if we ever use more than one legacy MSI in  in find_u4_magic_addr()
91 	 * a block but we never do. For one MSI or multiple MSI-X where  in find_u4_magic_addr()
95 	if (of_device_is_compatible(hose->dn, "u4-pcie") ||  in find_u4_magic_addr()
96 	    of_device_is_compatible(hose->dn, "U4-pcie"))  in find_u4_magic_addr()
108 		if (!entry->irq)  in u3msi_teardown_msi_irqs()
111 		hwirq = virq_to_hw(entry->irq);  in u3msi_teardown_msi_irqs()
112 		irq_set_msi_desc(entry->irq, NULL);  in u3msi_teardown_msi_irqs()
113 		irq_dispose_mapping(entry->irq);  in u3msi_teardown_msi_irqs()
114 		msi_bitmap_free_hwirqs(&msi_mpic->msi_bitmap, hwirq, 1);  in u3msi_teardown_msi_irqs()
129 		pr_debug("u3msi: MSI-X untested, trying anyway.\n");  in u3msi_setup_msi_irqs()
131 	/* If we can't find a magic address then MSI ain't gonna work */  in u3msi_setup_msi_irqs()
136 		return -ENXIO;  in u3msi_setup_msi_irqs()
140 		hwirq = msi_bitmap_alloc_hwirqs(&msi_mpic->msi_bitmap, 1);  in u3msi_setup_msi_irqs()
152 		virq = irq_create_mapping(msi_mpic->irqhost, hwirq);  in u3msi_setup_msi_irqs()
154 			pr_debug("u3msi: failed mapping hwirq 0x%x\n", hwirq);  in u3msi_setup_msi_irqs()
155 			msi_bitmap_free_hwirqs(&msi_mpic->msi_bitmap, hwirq, 1);  in u3msi_setup_msi_irqs()
156 			return -ENOSPC;  in u3msi_setup_msi_irqs()
163 		pr_debug("u3msi: allocated virq 0x%x (hw 0x%x) addr 0x%lx\n",  in u3msi_setup_msi_irqs()
166 		printk("u3msi: allocated virq 0x%x (hw 0x%x) addr 0x%lx\n",  in u3msi_setup_msi_irqs()
188 	pr_debug("u3msi: Registering MPIC U3 MSI callbacks.\n");  in mpic_u3msi_init()
194 		WARN_ON(phb->controller_ops.setup_msi_irqs);  in mpic_u3msi_init()
195 		phb->controller_ops.setup_msi_irqs = u3msi_setup_msi_irqs;  in mpic_u3msi_init()
196 		phb->controller_ops.teardown_msi_irqs = u3msi_teardown_msi_irqs;  in mpic_u3msi_init()