From fa12b773b7fb5830469086d36eb5be9f6b512f4d Mon Sep 17 00:00:00 2001 From: Paul Burton Date: Fri, 21 Mar 2014 15:20:31 +0000 Subject: 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 Tested-by: James Hogan Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/6641/ Signed-off-by: Ralf Baechle --- arch/mips/pci/fixup-malta.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) (limited to 'arch/mips/pci') diff --git a/arch/mips/pci/fixup-malta.c b/arch/mips/pci/fixup-malta.c index 7a0eda782e35..2f9e52a1a750 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; -- cgit v1.2.3