arch/powerpc/kernel/msi.c

   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                 pr_debug("msi: Platform doesn't provide MSI callbacks.\n");
  23                 return -ENOSYS;
  24         }
  25
  26         /* PowerPC doesn't support multiple MSI yet */
  27         if (type == PCI_CAP_ID_MSI && nvec > 1)
  28                 return 1;
  29
  30         return phb->controller_ops.setup_msi_irqs(dev, nvec, type);
  31 }
  32
  33 void arch_teardown_msi_irqs(struct pci_dev *dev)
  34 {
  35         struct pci_controller *phb = pci_bus_to_host(dev->bus);
  36
  37         phb->controller_ops.teardown_msi_irqs(dev);
  38 }