x86: enable hpet=force for AMD SB400
Add quirk to allow forced usage of HPET on ATI SB400. I stumbled over machines where HPET is enabled but not reported by BIOS. This patch configures the HPET base address and makes it known to the OS. Signed-off-by: Andreas Herrmann <andreas.herrmann3@amd.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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@ -65,6 +65,7 @@ static enum {
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ICH_FORCE_HPET_RESUME,
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VT8237_FORCE_HPET_RESUME,
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NVIDIA_FORCE_HPET_RESUME,
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ATI_FORCE_HPET_RESUME,
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} force_hpet_resume_type;
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static void __iomem *rcba_base;
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@ -330,6 +331,31 @@ DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8235,
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DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8237,
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vt8237_force_enable_hpet);
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static void ati_force_hpet_resume(void)
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{
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pci_write_config_dword(cached_dev, 0x14, 0xfed00000);
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printk(KERN_DEBUG "Force enabled HPET at resume\n");
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}
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static void ati_force_enable_hpet(struct pci_dev *dev)
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{
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u32 uninitialized_var(val);
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if (!hpet_force_user || hpet_address || force_hpet_address)
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return;
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pci_write_config_dword(dev, 0x14, 0xfed00000);
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pci_read_config_dword(dev, 0x14, &val);
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force_hpet_address = val;
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force_hpet_resume_type = ATI_FORCE_HPET_RESUME;
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dev_printk(KERN_DEBUG, &dev->dev, "Force enabled HPET at 0x%lx\n",
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force_hpet_address);
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cached_dev = dev;
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return;
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}
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DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_IXP400_SMBUS,
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ati_force_enable_hpet);
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/*
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* Undocumented chipset feature taken from LinuxBIOS.
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*/
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@ -397,6 +423,9 @@ void force_hpet_resume(void)
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case NVIDIA_FORCE_HPET_RESUME:
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nvidia_force_hpet_resume();
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return;
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case ATI_FORCE_HPET_RESUME:
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ati_force_hpet_resume();
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return;
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default:
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break;
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}
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