1 /* 2 * Copyright 2006-2007, Michael Ellerman, IBM Corporation. 3 * 4 * This program is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU General Public License 6 * as published by the Free Software Foundation; either version 7 * 2 of the License, or (at your option) any later version. 8 */ 9 10 #include <linux/kernel.h> 11 #include <linux/msi.h> 12 #include <linux/pci.h> 13 14 #include <asm/machdep.h> 15 16 int arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type) 17 { 18 struct pci_controller *phb = pci_bus_to_host(dev->bus); 19 20 if ((!phb->controller_ops.setup_msi_irqs || 21 !phb->controller_ops.teardown_msi_irqs) && 22 (!ppc_md.setup_msi_irqs || !ppc_md.teardown_msi_irqs)) { 23 pr_debug("msi: Platform doesn't provide MSI callbacks.\n"); 24 return -ENOSYS; 25 } 26 27 /* PowerPC doesn't support multiple MSI yet */ 28 if (type == PCI_CAP_ID_MSI && nvec > 1) 29 return 1; 30 31 if (phb->controller_ops.setup_msi_irqs) 32 return phb->controller_ops.setup_msi_irqs(dev, nvec, type); 33 else 34 return ppc_md.setup_msi_irqs(dev, nvec, type); 35 } 36 37 void arch_teardown_msi_irqs(struct pci_dev *dev) 38 { 39 struct pci_controller *phb = pci_bus_to_host(dev->bus); 40 41 if (phb->controller_ops.teardown_msi_irqs) 42 phb->controller_ops.teardown_msi_irqs(dev); 43 else 44 ppc_md.teardown_msi_irqs(dev); 45 } 46