Merge branch 'master' of /usr/src/ntfs-2.6/
[linux-2.6] / arch / i386 / kernel / quirks.c
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         pci_write_config_byte(dev, 0xf4, config|0x2);
29
30         /* read xTPR register */
31         raw_pci_ops->read(0, 0, 0x40, 0x4c, 2, &word);
32
33         if (!(word & (1 << 13))) {
34                 printk(KERN_INFO "Disabling irq balancing and affinity\n");
35 #ifdef CONFIG_IRQBALANCE
36                 irqbalance_disable("");
37 #endif
38                 noirqdebug_setup("");
39 #ifdef CONFIG_PROC_FS
40                 no_irq_affinity = 1;
41 #endif
42         }
43
44         /* put back the original value for config space*/
45         if (!(config & 0x2))
46                 pci_write_config_byte(dev, 0xf4, config);
47 }
48 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL,    PCI_DEVICE_ID_INTEL_E7320_MCH,  quirk_intel_irqbalance);
49 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL,    PCI_DEVICE_ID_INTEL_E7525_MCH,  quirk_intel_irqbalance);
50 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL,    PCI_DEVICE_ID_INTEL_E7520_MCH,  quirk_intel_irqbalance);
51 #endif