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Commit fa12b773 authored by Paul Burton's avatar Paul Burton Committed by Ralf Baechle
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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: default avatarPaul Burton <paul.burton@imgtec.com>
Tested-by: default avatarJames Hogan <james.hogan@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/6641/


Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
parent 024e6a8b

arch/mips/include/asm/mips-boards/piix4.h

+5 −0
Original line number Diff line number Diff line
@@ -50,4 +50,9 @@ 
#define PIIX4_FUNC1_IDETIM_SECONDARY_HI		0x43

#define   PIIX4_FUNC1_IDETIM_SECONDARY_HI_IDE_DECODE_EN	(1 << 7)



/* Power Management Configuration Space */

#define PIIX4_FUNC3_PMBA			0x40

#define PIIX4_FUNC3_PMREGMISC			0x80

#define   PIIX4_FUNC3_PMREGMISC_EN			(1 << 0)



#endif /* __ASM_MIPS_BOARDS_PIIX4_H */

arch/mips/pci/fixup-malta.c

+13 −0
Original line number Diff line number Diff line
@@ -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;