Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * This file contains work-arounds for x86 and x86_64 platform bugs. | |
3 | */ | |
4 | #include <linux/config.h> | |
5 | #include <linux/pci.h> | |
6 | #include <linux/irq.h> | |
7 | ||
8 | #if defined(CONFIG_X86_IO_APIC) && defined(CONFIG_SMP) && defined(CONFIG_PCI) | |
9 | ||
10 | static void __devinit quirk_intel_irqbalance(struct pci_dev *dev) | |
11 | { | |
12 | u8 config, rev; | |
13 | u32 word; | |
14 | ||
15 | /* BIOS may enable hardware IRQ balancing for | |
16 | * E7520/E7320/E7525(revision ID 0x9 and below) | |
17 | * based platforms. | |
18 | * Disable SW irqbalance/affinity on those platforms. | |
19 | */ | |
20 | pci_read_config_byte(dev, PCI_CLASS_REVISION, &rev); | |
21 | if (rev > 0x9) | |
22 | return; | |
23 | ||
24 | printk(KERN_INFO "Intel E7520/7320/7525 detected."); | |
25 | ||
26 | /* enable access to config space*/ | |
27 | pci_read_config_byte(dev, 0xf4, &config); | |
28 | config |= 0x2; | |
29 | pci_write_config_byte(dev, 0xf4, config); | |
30 | ||
31 | /* read xTPR register */ | |
32 | raw_pci_ops->read(0, 0, 0x40, 0x4c, 2, &word); | |
33 | ||
34 | if (!(word & (1 << 13))) { | |
35 | printk(KERN_INFO "Disabling irq balancing and affinity\n"); | |
36 | #ifdef CONFIG_IRQBALANCE | |
37 | irqbalance_disable(""); | |
38 | #endif | |
39 | noirqdebug_setup(""); | |
40 | #ifdef CONFIG_PROC_FS | |
41 | no_irq_affinity = 1; | |
42 | #endif | |
43 | } | |
44 | ||
45 | config &= ~0x2; | |
46 | /* disable access to config space*/ | |
47 | pci_write_config_byte(dev, 0xf4, config); | |
48 | } | |
49 | DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_E7320_MCH, quirk_intel_irqbalance); | |
50 | DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_E7525_MCH, quirk_intel_irqbalance); | |
51 | DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_E7520_MCH, quirk_intel_irqbalance); | |
52 | #endif |