release/src-rt-6.x.4708/linux/linux-2.6.36/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_msi_check_device(struct pci_dev* dev, int nvec, int type)
  17 {
  18         if (!ppc_md.setup_msi_irqs || !ppc_md.teardown_msi_irqs) {
  19                 pr_debug("msi: Platform doesn't provide MSI callbacks.\n");
  20                 return -ENOSYS;
  21         }
  22
  23         /* PowerPC doesn't support multiple MSI yet */
  24         if (type == PCI_CAP_ID_MSI && nvec > 1)
  25                 return 1;
  26
  27         if (ppc_md.msi_check_device) {
  28                 pr_debug("msi: Using platform check routine.\n");
  29                 return ppc_md.msi_check_device(dev, nvec, type);
  30         }
  31
  32         return 0;
  33 }
  34
  35 int arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
  36 {
  37         return ppc_md.setup_msi_irqs(dev, nvec, type);
  38 }
  39
  40 void arch_teardown_msi_irqs(struct pci_dev *dev)
  41 {
  42         ppc_md.teardown_msi_irqs(dev);
  43 }