1 files changed, 136 insertions, 0 deletions
diff --git a/arch/x86/kernel/early-quirks.c b/arch/x86/kernel/early-quirks.c
new file mode 100644
index 000000000000..dc34acbd54aa
--- /dev/null
+++ b/arch/x86/kernel/early-quirks.c
@@ -0,0 +1,136 @@
+/* Various workarounds for chipset bugs.
+   This code runs very early and can't use the regular PCI subsystem
+   The entries are keyed to PCI bridges which usually identify chipsets
+   uniquely.
+   This is only for whole classes of chipsets with specific problems which
+   need early invasive action (e.g. before the timers are initialized).
+   Most PCI device specific workarounds can be done later and should be
+   in standard PCI quirks
+   Mainboard specific bugs should be handled by DMI entries.
+   CPU specific bugs in setup.c */
+
+#include <linux/pci.h>
+#include <linux/acpi.h>
+#include <linux/pci_ids.h>
+#include <asm/pci-direct.h>
+#include <asm/dma.h>
+#include <asm/io_apic.h>
+#include <asm/apic.h>
+
+#ifdef CONFIG_IOMMU
+#include <asm/iommu.h>
+#endif
+
+static void __init via_bugs(void)
+{
+#ifdef CONFIG_IOMMU
+	if ((end_pfn > MAX_DMA32_PFN ||  force_iommu) &&
+	    !iommu_aperture_allowed) {
+		printk(KERN_INFO
+		       "Looks like a VIA chipset. Disabling IOMMU."
+		       " Override with iommu=allowed\n");
+		iommu_aperture_disabled = 1;
+	}
+#endif
+}
+
+#ifdef CONFIG_ACPI
+
+static int __init nvidia_hpet_check(struct acpi_table_header *header)
+{
+	return 0;
+}
+#endif
+
+static void __init nvidia_bugs(void)
+{
+#ifdef CONFIG_ACPI
+#ifdef CONFIG_X86_IO_APIC
+	/*
+	 * All timer overrides on Nvidia are
+	 * wrong unless HPET is enabled.
+	 * Unfortunately that's not true on many Asus boards.
+	 * We don't know yet how to detect this automatically, but
+	 * at least allow a command line override.
+	 */
+	if (acpi_use_timer_override)
+		return;
+
+	if (acpi_table_parse(ACPI_SIG_HPET, nvidia_hpet_check)) {
+		acpi_skip_timer_override = 1;
+		printk(KERN_INFO "Nvidia board "
+		       "detected. Ignoring ACPI "
+		       "timer override.\n");
+		printk(KERN_INFO "If you got timer trouble "
+			"try acpi_use_timer_override\n");
+	}
+#endif
+#endif
+	/* RED-PEN skip them on mptables too? */
+
+}
+
+static void __init ati_bugs(void)
+{
+#ifdef CONFIG_X86_IO_APIC
+	if (timer_over_8254 == 1) {
+		timer_over_8254 = 0;
+		printk(KERN_INFO
+		"ATI board detected. Disabling timer routing over 8254.\n");
+	}
+#endif
+}
+
+struct chipset {
+	u16 vendor;
+	void (*f)(void);
+};
+
+static struct chipset early_qrk[] __initdata = {
+	{ PCI_VENDOR_ID_NVIDIA, nvidia_bugs },
+	{ PCI_VENDOR_ID_VIA, via_bugs },
+	{ PCI_VENDOR_ID_ATI, ati_bugs },
+	{}
+};
+
+void __init early_quirks(void)
+{
+	int num, slot, func;
+
+	if (!early_pci_allowed())
+		return;
+
+	/* Poor man's PCI discovery */
+	for (num = 0; num < 32; num++) {
+		for (slot = 0; slot < 32; slot++) {
+			for (func = 0; func < 8; func++) {
+				u32 class;
+				u32 vendor;
+				u8 type;
+				int i;
+				class = read_pci_config(num,slot,func,
+							PCI_CLASS_REVISION);
+				if (class == 0xffffffff)
+					break;
+
+				if ((class >> 16) != PCI_CLASS_BRIDGE_PCI)
+					continue;
+
+				vendor = read_pci_config(num, slot, func,
+							 PCI_VENDOR_ID);
+				vendor &= 0xffff;
+
+				for (i = 0; early_qrk[i].f; i++)
+					if (early_qrk[i].vendor == vendor) {
+						early_qrk[i].f();
+						return;
+					}
+
+				type = read_pci_config_byte(num, slot, func,
+							    PCI_HEADER_TYPE);
+				if (!(type & 0x80))
+					break;
+			}
+		}
+	}
+}