arch/x86/kernel/early-quirks.c

   1 /* Various workarounds for chipset bugs.
   2    This code runs very early and can't use the regular PCI subsystem
   3    The entries are keyed to PCI bridges which usually identify chipsets
   4    uniquely.
   5    This is only for whole classes of chipsets with specific problems which
   6    need early invasive action (e.g. before the timers are initialized).
   7    Most PCI device specific workarounds can be done later and should be
   8    in standard PCI quirks
   9    Mainboard specific bugs should be handled by DMI entries.
  10    CPU specific bugs in setup.c */
  11
  12 #include <linux/pci.h>
  13 #include <linux/acpi.h>
  14 #include <linux/pci_ids.h>
  15 #include <asm/pci-direct.h>
  16 #include <asm/dma.h>
  17 #include <asm/io_apic.h>
  18 #include <asm/apic.h>
  19 #include <asm/iommu.h>
  20
  21 static void __init fix_hypertransport_config(int num, int slot, int func)
  22 {
  23         u32 htcfg;
  24         /*
  25          * we found a hypertransport bus
  26          * make sure that we are broadcasting
  27          * interrupts to all cpus on the ht bus
  28          * if we're using extended apic ids
  29          */
  30         htcfg = read_pci_config(num, slot, func, 0x68);
  31         if (htcfg & (1 << 18)) {
  32                 printk(KERN_INFO "Detected use of extended apic ids "
  33                                  "on hypertransport bus\n");
  34                 if ((htcfg & (1 << 17)) == 0) {
  35                         printk(KERN_INFO "Enabling hypertransport extended "
  36                                          "apic interrupt broadcast\n");
  37                         printk(KERN_INFO "Note this is a bios bug, "
  38                                          "please contact your hw vendor\n");
  39                         htcfg |= (1 << 17);
  40                         write_pci_config(num, slot, func, 0x68, htcfg);
  41                 }
  42         }
  43
  44
  45 }
  46
  47 static void __init via_bugs(int  num, int slot, int func)
  48 {
  49 #ifdef CONFIG_GART_IOMMU
  50         if ((max_pfn > MAX_DMA32_PFN ||  force_iommu) &&
  51             !gart_iommu_aperture_allowed) {
  52                 printk(KERN_INFO
  53                        "Looks like a VIA chipset. Disabling IOMMU."
  54                        " Override with iommu=allowed\n");
  55                 gart_iommu_aperture_disabled = 1;
  56         }
  57 #endif
  58 }
  59
  60 #ifdef CONFIG_ACPI
  61 #ifdef CONFIG_X86_IO_APIC
  62
  63 static int __init nvidia_hpet_check(struct acpi_table_header *header)
  64 {
  65         return 0;
  66 }
  67 #endif /* CONFIG_X86_IO_APIC */
  68 #endif /* CONFIG_ACPI */
  69
  70 static void __init nvidia_bugs(int num, int slot, int func)
  71 {
  72 #ifdef CONFIG_ACPI
  73 #ifdef CONFIG_X86_IO_APIC
  74         /*
  75          * All timer overrides on Nvidia are
  76          * wrong unless HPET is enabled.
  77          * Unfortunately that's not true on many Asus boards.
  78          * We don't know yet how to detect this automatically, but
  79          * at least allow a command line override.
  80          */
  81         if (acpi_use_timer_override)
  82                 return;
  83
  84         if (acpi_table_parse(ACPI_SIG_HPET, nvidia_hpet_check)) {
  85                 acpi_skip_timer_override = 1;
  86                 printk(KERN_INFO "Nvidia board "
  87                        "detected. Ignoring ACPI "
  88                        "timer override.\n");
  89                 printk(KERN_INFO "If you got timer trouble "
  90                         "try acpi_use_timer_override\n");
  91         }
  92 #endif
  93 #endif
  94         /* RED-PEN skip them on mptables too? */
  95
  96 }
  97
  98 static u32 ati_ixp4x0_rev(int num, int slot, int func)
  99 {
 100         u32 d;
 101         u8  b;
 102
 103         b = read_pci_config_byte(num, slot, func, 0xac);
 104         b &= ~(1<<5);
 105         write_pci_config_byte(num, slot, func, 0xac, b);
 106
 107         d = read_pci_config(num, slot, func, 0x70);
 108         d |= 1<<8;
 109         write_pci_config(num, slot, func, 0x70, d);
 110
 111         d = read_pci_config(num, slot, func, 0x8);
 112         d &= 0xff;
 113         return d;
 114 }
 115
 116 static void __init ati_bugs(int num, int slot, int func)
 117 {
 118 #if defined(CONFIG_ACPI) && defined (CONFIG_X86_IO_APIC)
 119         u32 d;
 120         u8  b;
 121
 122         if (acpi_use_timer_override)
 123                 return;
 124
 125         d = ati_ixp4x0_rev(num, slot, func);
 126         if (d  < 0x82)
 127                 acpi_skip_timer_override = 1;
 128         else {
 129                 /* check for IRQ0 interrupt swap */
 130                 outb(0x72, 0xcd6); b = inb(0xcd7);
 131                 if (!(b & 0x2))
 132                         acpi_skip_timer_override = 1;
 133         }
 134
 135         if (acpi_skip_timer_override) {
 136                 printk(KERN_INFO "SB4X0 revision 0x%x\n", d);
 137                 printk(KERN_INFO "Ignoring ACPI timer override.\n");
 138                 printk(KERN_INFO "If you got timer trouble "
 139                        "try acpi_use_timer_override\n");
 140         }
 141 #endif
 142 }
 143
 144 #define QFLAG_APPLY_ONCE        0x1
 145 #define QFLAG_APPLIED           0x2
 146 #define QFLAG_DONE              (QFLAG_APPLY_ONCE|QFLAG_APPLIED)
 147 struct chipset {
 148         u32 vendor;
 149         u32 device;
 150         u32 class;
 151         u32 class_mask;
 152         u32 flags;
 153         void (*f)(int num, int slot, int func);
 154 };
 155
 156 static struct chipset early_qrk[] __initdata = {
 157         { PCI_VENDOR_ID_NVIDIA, PCI_ANY_ID,
 158           PCI_CLASS_BRIDGE_PCI, PCI_ANY_ID, QFLAG_APPLY_ONCE, nvidia_bugs },
 159         { PCI_VENDOR_ID_VIA, PCI_ANY_ID,
 160           PCI_CLASS_BRIDGE_PCI, PCI_ANY_ID, QFLAG_APPLY_ONCE, via_bugs },
 161         { PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_K8_NB,
 162           PCI_CLASS_BRIDGE_HOST, PCI_ANY_ID, 0, fix_hypertransport_config },
 163         { PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_IXP400_SMBUS,
 164           PCI_CLASS_SERIAL_SMBUS, PCI_ANY_ID, 0, ati_bugs },
 165         {}
 166 };
 167
 168 /**
 169  * check_dev_quirk - apply early quirks to a given PCI device
 170  * @num: bus number
 171  * @slot: slot number
 172  * @func: PCI function
 173  *
 174  * Check the vendor & device ID against the early quirks table.
 175  *
 176  * If the device is single function, let early_quirks() know so we don't
 177  * poke at this device again.
 178  */
 179 static int __init check_dev_quirk(int num, int slot, int func)
 180 {
 181         u16 class;
 182         u16 vendor;
 183         u16 device;
 184         u8 type;
 185         int i;
 186
 187         class = read_pci_config_16(num, slot, func, PCI_CLASS_DEVICE);
 188
 189         if (class == 0xffff)
 190                 return -1; /* no class, treat as single function */
 191
 192         vendor = read_pci_config_16(num, slot, func, PCI_VENDOR_ID);
 193
 194         device = read_pci_config_16(num, slot, func, PCI_DEVICE_ID);
 195
 196         for (i = 0; early_qrk[i].f != NULL; i++) {
 197                 if (((early_qrk[i].vendor == PCI_ANY_ID) ||
 198                         (early_qrk[i].vendor == vendor)) &&
 199                         ((early_qrk[i].device == PCI_ANY_ID) ||
 200                         (early_qrk[i].device == device)) &&
 201                         (!((early_qrk[i].class ^ class) &
 202                             early_qrk[i].class_mask))) {
 203                                 if ((early_qrk[i].flags &
 204                                      QFLAG_DONE) != QFLAG_DONE)
 205                                         early_qrk[i].f(num, slot, func);
 206                                 early_qrk[i].flags |= QFLAG_APPLIED;
 207                         }
 208         }
 209
 210         type = read_pci_config_byte(num, slot, func,
 211                                     PCI_HEADER_TYPE);
 212         if (!(type & 0x80))
 213                 return -1;
 214
 215         return 0;
 216 }
 217
 218 void __init early_quirks(void)
 219 {
 220         int num, slot, func;
 221
 222         if (!early_pci_allowed())
 223                 return;
 224
 225         /* Poor man's PCI discovery */
 226         for (num = 0; num < 32; num++)
 227                 for (slot = 0; slot < 32; slot++)
 228                         for (func = 0; func < 8; func++) {
 229                                 /* Only probe function 0 on single fn devices */
 230                                 if (check_dev_quirk(num, slot, func))
 231                                         break;
 232                         }
 233 }