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 #if defined(CONFIG_ACPI) && defined(CONFIG_X86_IO_APIC)
  99 static u32 __init ati_ixp4x0_rev(int num, int slot, int func)
 100 {
 101         u32 d;
 102         u8  b;
 103
 104         b = read_pci_config_byte(num, slot, func, 0xac);
 105         b &= ~(1<<5);
 106         write_pci_config_byte(num, slot, func, 0xac, b);
 107
 108         d = read_pci_config(num, slot, func, 0x70);
 109         d |= 1<<8;
 110         write_pci_config(num, slot, func, 0x70, d);
 111
 112         d = read_pci_config(num, slot, func, 0x8);
 113         d &= 0xff;
 114         return d;
 115 }
 116
 117 static void __init ati_bugs(int num, int slot, int func)
 118 {
 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 }
 142
 143 static u32 __init ati_sbx00_rev(int num, int slot, int func)
 144 {
 145         u32 old, d;
 146
 147         d = read_pci_config(num, slot, func, 0x70);
 148         old = d;
 149         d &= ~(1<<8);
 150         write_pci_config(num, slot, func, 0x70, d);
 151         d = read_pci_config(num, slot, func, 0x8);
 152         d &= 0xff;
 153         write_pci_config(num, slot, func, 0x70, old);
 154
 155         return d;
 156 }
 157
 158 static void __init ati_bugs_contd(int num, int slot, int func)
 159 {
 160         u32 d, rev;
 161
 162         if (acpi_use_timer_override)
 163                 return;
 164
 165         rev = ati_sbx00_rev(num, slot, func);
 166         if (rev > 0x13)
 167                 return;
 168
 169         /* check for IRQ0 interrupt swap */
 170         d = read_pci_config(num, slot, func, 0x64);
 171         if (!(d & (1<<14)))
 172                 acpi_skip_timer_override = 1;
 173
 174         if (acpi_skip_timer_override) {
 175                 printk(KERN_INFO "SB600 revision 0x%x\n", rev);
 176                 printk(KERN_INFO "Ignoring ACPI timer override.\n");
 177                 printk(KERN_INFO "If you got timer trouble "
 178                        "try acpi_use_timer_override\n");
 179         }
 180 }
 181 #else
 182 static void __init ati_bugs(int num, int slot, int func)
 183 {
 184 }
 185
 186 static void __init ati_bugs_contd(int num, int slot, int func)
 187 {
 188 }
 189 #endif
 190
 191 #define QFLAG_APPLY_ONCE        0x1
 192 #define QFLAG_APPLIED           0x2
 193 #define QFLAG_DONE              (QFLAG_APPLY_ONCE|QFLAG_APPLIED)
 194 struct chipset {
 195         u32 vendor;
 196         u32 device;
 197         u32 class;
 198         u32 class_mask;
 199         u32 flags;
 200         void (*f)(int num, int slot, int func);
 201 };
 202
 203 static struct chipset early_qrk[] __initdata = {
 204         { PCI_VENDOR_ID_NVIDIA, PCI_ANY_ID,
 205           PCI_CLASS_BRIDGE_PCI, PCI_ANY_ID, QFLAG_APPLY_ONCE, nvidia_bugs },
 206         { PCI_VENDOR_ID_VIA, PCI_ANY_ID,
 207           PCI_CLASS_BRIDGE_PCI, PCI_ANY_ID, QFLAG_APPLY_ONCE, via_bugs },
 208         { PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_K8_NB,
 209           PCI_CLASS_BRIDGE_HOST, PCI_ANY_ID, 0, fix_hypertransport_config },
 210         { PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_IXP400_SMBUS,
 211           PCI_CLASS_SERIAL_SMBUS, PCI_ANY_ID, 0, ati_bugs },
 212         { PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_SBX00_SMBUS,
 213           PCI_CLASS_SERIAL_SMBUS, PCI_ANY_ID, 0, ati_bugs_contd },
 214         {}
 215 };
 216
 217 /**
 218  * check_dev_quirk - apply early quirks to a given PCI device
 219  * @num: bus number
 220  * @slot: slot number
 221  * @func: PCI function
 222  *
 223  * Check the vendor & device ID against the early quirks table.
 224  *
 225  * If the device is single function, let early_quirks() know so we don't
 226  * poke at this device again.
 227  */
 228 static int __init check_dev_quirk(int num, int slot, int func)
 229 {
 230         u16 class;
 231         u16 vendor;
 232         u16 device;
 233         u8 type;
 234         int i;
 235
 236         class = read_pci_config_16(num, slot, func, PCI_CLASS_DEVICE);
 237
 238         if (class == 0xffff)
 239                 return -1; /* no class, treat as single function */
 240
 241         vendor = read_pci_config_16(num, slot, func, PCI_VENDOR_ID);
 242
 243         device = read_pci_config_16(num, slot, func, PCI_DEVICE_ID);
 244
 245         for (i = 0; early_qrk[i].f != NULL; i++) {
 246                 if (((early_qrk[i].vendor == PCI_ANY_ID) ||
 247                         (early_qrk[i].vendor == vendor)) &&
 248                         ((early_qrk[i].device == PCI_ANY_ID) ||
 249                         (early_qrk[i].device == device)) &&
 250                         (!((early_qrk[i].class ^ class) &
 251                             early_qrk[i].class_mask))) {
 252                                 if ((early_qrk[i].flags &
 253                                      QFLAG_DONE) != QFLAG_DONE)
 254                                         early_qrk[i].f(num, slot, func);
 255                                 early_qrk[i].flags |= QFLAG_APPLIED;
 256                         }
 257         }
 258
 259         type = read_pci_config_byte(num, slot, func,
 260                                     PCI_HEADER_TYPE);
 261         if (!(type & 0x80))
 262                 return -1;
 263
 264         return 0;
 265 }
 266
 267 void __init early_quirks(void)
 268 {
 269         int num, slot, func;
 270
 271         if (!early_pci_allowed())
 272                 return;
 273
 274         /* Poor man's PCI discovery */
 275         for (num = 0; num < 32; num++)
 276                 for (slot = 0; slot < 32; slot++)
 277                         for (func = 0; func < 8; func++) {
 278                                 /* Only probe function 0 on single fn devices */
 279                                 if (check_dev_quirk(num, slot, func))
 280                                         break;
 281                         }
 282 }