diff options
| author |   Chandrakala Chavva <cchavva@caviumnetworks.com> | 2010-07-26 18:14:16 -0700 |
|---|---|---|
| committer |   Ralf Baechle <ralf@linux-mips.org> | 2010-08-05 13:26:27 +0100 |
| commit | 52a0f00b50ea360e3cf7e3281523c6a8aafc5761 (patch) | |
| tree | 5824f0ebbb4986f1171574dabe6ee2b849f72f9a /arch/mips | |
| parent | MIPS: Octeon: Support 256 MSI on PCIe (diff) | |
| download | linux-dev-52a0f00b50ea360e3cf7e3281523c6a8aafc5761.tar.xz linux-dev-52a0f00b50ea360e3cf7e3281523c6a8aafc5761.zip | |
MIPS: Octeon: Disallow MSI-X interrupt and fall back to MSI interrupts.
MSI-X interrupts are not supported yet for Octeon, return error if
MSI-X interrupts are requested by driver so that the driver will fall
back to use MSI interrupts.
Signed-off-by: Chandrakala Chavva <cchavva@caviumnetworks.com>
To: linux-mips@linux-mips.org
Cc: David Daney <ddaney@caviumnetworks.com>
Patchwork: https://patchwork.linux-mips.org/patch/1506/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: David Daney <ddaney@caviumnetworks.com>
Diffstat (limited to 'arch/mips')
| -rw-r--r-- | arch/mips/include/asm/pci.h | 5 | ||||
| -rw-r--r-- | arch/mips/pci/msi-octeon.c | 28 |
2 files changed, 33 insertions, 0 deletions
diff --git a/arch/mips/include/asm/pci.h b/arch/mips/include/asm/pci.h index 3beea1479b43..576397c69920 100644 --- a/arch/mips/include/asm/pci.h +++ b/arch/mips/include/asm/pci.h @@ -140,6 +140,11 @@ static inline int pci_get_legacy_ide_irq(struct pci_dev *dev, int channel) return channel ? 15 : 14; } +#ifdef CONFIG_CPU_CAVIUM_OCTEON +/* MSI arch hook for OCTEON */ +#define arch_setup_msi_irqs arch_setup_msi_irqs +#endif + extern int pci_probe_only; extern char * (*pcibios_plat_setup)(char *str); diff --git a/arch/mips/pci/msi-octeon.c b/arch/mips/pci/msi-octeon.c index 7c756408b85d..d8080499872a 100644 --- a/arch/mips/pci/msi-octeon.c +++ b/arch/mips/pci/msi-octeon.c @@ -177,6 +177,34 @@ msi_irq_allocated: return 0; } +int arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type) +{ + struct msi_desc *entry; + int ret; + + /* + * MSI-X is not supported. + */ + if (type == PCI_CAP_ID_MSIX) + return -EINVAL; + + /* + * If an architecture wants to support multiple MSI, it needs to + * override arch_setup_msi_irqs() + */ + if (type == PCI_CAP_ID_MSI && nvec > 1) + return 1; + + list_for_each_entry(entry, &dev->msi_list, list) { + ret = arch_setup_msi_irq(dev, entry); + if (ret < 0) + return ret; + if (ret > 0) + return -ENOSPC; + } + + return 0; +} /** * Called when a device no longer needs its MSI interrupts. All |