diff options
| author | Paul Burton <paul.burton@imgtec.com> | 2014-03-21 15:20:31 (GMT) |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2014-03-31 16:17:12 (GMT) |
| commit | fa12b773b7fb5830469086d36eb5be9f6b512f4d (patch) | |
| tree | 7f1f4ce47d8b0a24c5b642c84fdb2f9e2cb7a43b /arch/mips/pci/fixup-malta.c | |
| parent | 024e6a8b5bb16b1372eec744f417779aa4b59d1c (diff) | |
| download | linux-fa12b773b7fb5830469086d36eb5be9f6b512f4d.tar.xz | |
MIPS: Malta: Setup PM I/O region on boot
This patch ensures that the kernel sets a sane base address for the
PIIX4 PM I/O register region during boot. Without this the kernel may
not successfully claim the region as a resource if the bootloader didn't
configure the region. With this patch the kernel will always succeed
with:
pci 0000:00:0a.3: quirk: [io 0x1000-0x103f] claimed by PIIX4 ACPI
The lack of the resource claiming is easily reproducible without this
patch using current versions of QEMU.
Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Tested-by: James Hogan <james.hogan@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/6641/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/pci/fixup-malta.c')
| -rw-r--r-- | arch/mips/pci/fixup-malta.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/arch/mips/pci/fixup-malta.c b/arch/mips/pci/fixup-malta.c index 7a0eda7..2f9e52a 100644 --- a/arch/mips/pci/fixup-malta.c +++ b/arch/mips/pci/fixup-malta.c @@ -51,6 +51,19 @@ int pcibios_plat_dev_init(struct pci_dev *dev) return 0; } +static void malta_piix_func3_base_fixup(struct pci_dev *dev) +{ + /* Set a sane PM I/O base address */ + pci_write_config_word(dev, PIIX4_FUNC3_PMBA, 0x1000); + + /* Enable access to the PM I/O region */ + pci_write_config_byte(dev, PIIX4_FUNC3_PMREGMISC, + PIIX4_FUNC3_PMREGMISC_EN); +} + +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82371AB_3, + malta_piix_func3_base_fixup); + static void malta_piix_func0_fixup(struct pci_dev *pdev) { unsigned char reg_val; |