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 #include <asm/gart.h>
  21
  22 static void __init fix_hypertransport_config(int num, int slot, int func)
  23 {
  24         u32 htcfg;
  25         /*
  26          * we found a hypertransport bus
  27          * make sure that we are broadcasting
  28          * interrupts to all cpus on the ht bus
  29          * if we're using extended apic ids
  30          */
  31         htcfg = read_pci_config(num, slot, func, 0x68);
  32         if (htcfg & (1 << 18)) {
  33                 printk(KERN_INFO "Detected use of extended apic ids "
  34                                  "on hypertransport bus\n");
  35                 if ((htcfg & (1 << 17)) == 0) {
  36                         printk(KERN_INFO "Enabling hypertransport extended "
  37                                          "apic interrupt broadcast\n");
  38                         printk(KERN_INFO "Note this is a bios bug, "
  39                                          "please contact your hw vendor\n");
  40                         htcfg |= (1 << 17);
  41                         write_pci_config(num, slot, func, 0x68, htcfg);
  42                 }
  43         }
  44
  45
  46 }
  47
  48 static void __init via_bugs(int  num, int slot, int func)
  49 {
  50 #ifdef CONFIG_GART_IOMMU
  51         if ((max_pfn > MAX_DMA32_PFN ||  force_iommu) &&
  52             !gart_iommu_aperture_allowed) {
  53                 printk(KERN_INFO
  54                        "Looks like a VIA chipset. Disabling IOMMU."
  55                        " Override with iommu=allowed\n");
  56                 gart_iommu_aperture_disabled = 1;
  57         }
  58 #endif
  59 }
  60
  61 #ifdef CONFIG_ACPI
  62 #ifdef CONFIG_X86_IO_APIC
  63
  64 static int __init nvidia_hpet_check(struct acpi_table_header *header)
  65 {
  66         return 0;
  67 }
  68 #endif /* CONFIG_X86_IO_APIC */
  69 #endif /* CONFIG_ACPI */
  70
  71 static void __init nvidia_bugs(int num, int slot, int func)
  72 {
  73 #ifdef CONFIG_ACPI
  74 #ifdef CONFIG_X86_IO_APIC
  75         /*
  76          * All timer overrides on Nvidia are
  77          * wrong unless HPET is enabled.
  78          * Unfortunately that's not true on many Asus boards.
  79          * We don't know yet how to detect this automatically, but
  80          * at least allow a command line override.
  81          */
  82         if (acpi_use_timer_override)
  83                 return;
  84
  85         if (acpi_table_parse(ACPI_SIG_HPET, nvidia_hpet_check)) {
  86                 acpi_skip_timer_override = 1;
  87                 printk(KERN_INFO "Nvidia board "
  88                        "detected. Ignoring ACPI "
  89                        "timer override.\n");
  90                 printk(KERN_INFO "If you got timer trouble "
  91                         "try acpi_use_timer_override\n");
  92         }
  93 #endif
  94 #endif
  95         /* RED-PEN skip them on mptables too? */
  96
  97 }
  98
  99 #if defined(CONFIG_ACPI) && defined(CONFIG_X86_IO_APIC)
 100 static u32 __init ati_ixp4x0_rev(int num, int slot, int func)
 101 {
 102         u32 d;
 103         u8  b;
 104
 105         b = read_pci_config_byte(num, slot, func, 0xac);
 106         b &= ~(1<<5);
 107         write_pci_config_byte(num, slot, func, 0xac, b);
 108
 109         d = read_pci_config(num, slot, func, 0x70);
 110         d |= 1<<8;
 111         write_pci_config(num, slot, func, 0x70, d);
 112
 113         d = read_pci_config(num, slot, func, 0x8);
 114         d &= 0xff;
 115         return d;
 116 }
 117
 118 static void __init ati_bugs(int num, int slot, int func)
 119 {
 120         u32 d;
 121         u8  b;
 122
 123         if (acpi_use_timer_override)
 124                 return;
 125
 126         d = ati_ixp4x0_rev(num, slot, func);
 127         if (d  < 0x82)
 128                 acpi_skip_timer_override = 1;
 129         else {
 130                 /* check for IRQ0 interrupt swap */
 131                 outb(0x72, 0xcd6); b = inb(0xcd7);
 132                 if (!(b & 0x2))
 133                         acpi_skip_timer_override = 1;
 134         }
 135
 136         if (acpi_skip_timer_override) {
 137                 printk(KERN_INFO "SB4X0 revision 0x%x\n", d);
 138                 printk(KERN_INFO "Ignoring ACPI timer override.\n");
 139                 printk(KERN_INFO "If you got timer trouble "
 140                        "try acpi_use_timer_override\n");
 141         }
 142 }
 143
 144 static u32 __init ati_sbx00_rev(int num, int slot, int func)
 145 {
 146         u32 d;
 147
 148         d = read_pci_config(num, slot, func, 0x8);
 149         d &= 0xff;
 150
 151         return d;
 152 }
 153
 154 static void __init ati_bugs_contd(int num, int slot, int func)
 155 {
 156         u32 d, rev;
 157
 158         rev = ati_sbx00_rev(num, slot, func);
 159         if (rev >= 0x40)
 160                 acpi_fix_pin2_polarity = 1;
 161
 162         /*
 163          * SB600: revisions 0x11, 0x12, 0x13, 0x14, ...
 164          * SB700: revisions 0x39, 0x3a, ...
 165          * SB800: revisions 0x40, 0x41, ...
 166          */
 167         if (rev >= 0x39)
 168                 return;
 169
 170         if (acpi_use_timer_override)
 171                 return;
 172
 173         /* check for IRQ0 interrupt swap */
 174         d = read_pci_config(num, slot, func, 0x64);
 175         if (!(d & (1<<14)))
 176                 acpi_skip_timer_override = 1;
 177
 178         if (acpi_skip_timer_override) {
 179                 printk(KERN_INFO "SB600 revision 0x%x\n", rev);
 180                 printk(KERN_INFO "Ignoring ACPI timer override.\n");
 181                 printk(KERN_INFO "If you got timer trouble "
 182                        "try acpi_use_timer_override\n");
 183         }
 184 }
 185 #else
 186 static void __init ati_bugs(int num, int slot, int func)
 187 {
 188 }
 189
 190 static void __init ati_bugs_contd(int num, int slot, int func)
 191 {
 192 }
 193 #endif
 194
 195 #define QFLAG_APPLY_ONCE        0x1
 196 #define QFLAG_APPLIED           0x2
 197 #define QFLAG_DONE              (QFLAG_APPLY_ONCE|QFLAG_APPLIED)
 198 struct chipset {
 199         u32 vendor;
 200         u32 device;
 201         u32 class;
 202         u32 class_mask;
 203         u32 flags;
 204         void (*f)(int num, int slot, int func);
 205 };
 206
 207 /*
 208  * Only works for devices on the root bus. If you add any devices
 209  * not on bus 0 readd another loop level in early_quirks(). But
 210  * be careful because at least the Nvidia quirk here relies on
 211  * only matching on bus 0.
 212  */
 213 static struct chipset early_qrk[] __initdata = {
 214         { PCI_VENDOR_ID_NVIDIA, PCI_ANY_ID,
 215           PCI_CLASS_BRIDGE_PCI, PCI_ANY_ID, QFLAG_APPLY_ONCE, nvidia_bugs },
 216         { PCI_VENDOR_ID_VIA, PCI_ANY_ID,
 217           PCI_CLASS_BRIDGE_PCI, PCI_ANY_ID, QFLAG_APPLY_ONCE, via_bugs },
 218         { PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_K8_NB,
 219           PCI_CLASS_BRIDGE_HOST, PCI_ANY_ID, 0, fix_hypertransport_config },
 220         { PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_IXP400_SMBUS,
 221           PCI_CLASS_SERIAL_SMBUS, PCI_ANY_ID, 0, ati_bugs },
 222         { PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_SBX00_SMBUS,
 223           PCI_CLASS_SERIAL_SMBUS, PCI_ANY_ID, 0, ati_bugs_contd },
 224         {}
 225 };
 226
 227 /**
 228  * check_dev_quirk - apply early quirks to a given PCI device
 229  * @num: bus number
 230  * @slot: slot number
 231  * @func: PCI function
 232  *
 233  * Check the vendor & device ID against the early quirks table.
 234  *
 235  * If the device is single function, let early_quirks() know so we don't
 236  * poke at this device again.
 237  */
 238 static int __init check_dev_quirk(int num, int slot, int func)
 239 {
 240         u16 class;
 241         u16 vendor;
 242         u16 device;
 243         u8 type;
 244         int i;
 245
 246         class = read_pci_config_16(num, slot, func, PCI_CLASS_DEVICE);
 247
 248         if (class == 0xffff)
 249                 return -1; /* no class, treat as single function */
 250
 251         vendor = read_pci_config_16(num, slot, func, PCI_VENDOR_ID);
 252
 253         device = read_pci_config_16(num, slot, func, PCI_DEVICE_ID);
 254
 255         for (i = 0; early_qrk[i].f != NULL; i++) {
 256                 if (((early_qrk[i].vendor == PCI_ANY_ID) ||
 257                         (early_qrk[i].vendor == vendor)) &&
 258                         ((early_qrk[i].device == PCI_ANY_ID) ||
 259                         (early_qrk[i].device == device)) &&
 260                         (!((early_qrk[i].class ^ class) &
 261                             early_qrk[i].class_mask))) {
 262                                 if ((early_qrk[i].flags &
 263                                      QFLAG_DONE) != QFLAG_DONE)
 264                                         early_qrk[i].f(num, slot, func);
 265                                 early_qrk[i].flags |= QFLAG_APPLIED;
 266                         }
 267         }
 268
 269         type = read_pci_config_byte(num, slot, func,
 270                                     PCI_HEADER_TYPE);
 271         if (!(type & 0x80))
 272                 return -1;
 273
 274         return 0;
 275 }
 276
 277 void __init early_quirks(void)
 278 {
 279         int slot, func;
 280
 281         if (!early_pci_allowed())
 282                 return;
 283
 284         /* Poor man's PCI discovery */
 285         /* Only scan the root bus */
 286         for (slot = 0; slot < 32; slot++)
 287                 for (func = 0; func < 8; func++) {
 288                         /* Only probe function 0 on single fn devices */
 289                         if (check_dev_quirk(0, slot, func))
 290                                 break;
 291                 }
 292 }