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 old, d;
 147
 148         d = read_pci_config(num, slot, func, 0x70);
 149         old = d;
 150         d &= ~(1<<8);
 151         write_pci_config(num, slot, func, 0x70, d);
 152         d = read_pci_config(num, slot, func, 0x8);
 153         d &= 0xff;
 154         write_pci_config(num, slot, func, 0x70, old);
 155
 156         return d;
 157 }
 158
 159 static void __init ati_bugs_contd(int num, int slot, int func)
 160 {
 161         u32 d, rev;
 162
 163         if (acpi_use_timer_override)
 164                 return;
 165
 166         rev = ati_sbx00_rev(num, slot, func);
 167         if (rev > 0x13)
 168                 return;
 169
 170         /* check for IRQ0 interrupt swap */
 171         d = read_pci_config(num, slot, func, 0x64);
 172         if (!(d & (1<<14)))
 173                 acpi_skip_timer_override = 1;
 174
 175         if (acpi_skip_timer_override) {
 176                 printk(KERN_INFO "SB600 revision 0x%x\n", rev);
 177                 printk(KERN_INFO "Ignoring ACPI timer override.\n");
 178                 printk(KERN_INFO "If you got timer trouble "
 179                        "try acpi_use_timer_override\n");
 180         }
 181 }
 182 #else
 183 static void __init ati_bugs(int num, int slot, int func)
 184 {
 185 }
 186
 187 static void __init ati_bugs_contd(int num, int slot, int func)
 188 {
 189 }
 190 #endif
 191
 192 #define QFLAG_APPLY_ONCE        0x1
 193 #define QFLAG_APPLIED           0x2
 194 #define QFLAG_DONE              (QFLAG_APPLY_ONCE|QFLAG_APPLIED)
 195 struct chipset {
 196         u32 vendor;
 197         u32 device;
 198         u32 class;
 199         u32 class_mask;
 200         u32 flags;
 201         void (*f)(int num, int slot, int func);
 202 };
 203
 204 /*
 205  * Only works for devices on the root bus. If you add any devices
 206  * not on bus 0 readd another loop level in early_quirks(). But
 207  * be careful because at least the Nvidia quirk here relies on
 208  * only matching on bus 0.
 209  */
 210 static struct chipset early_qrk[] __initdata = {
 211         { PCI_VENDOR_ID_NVIDIA, PCI_ANY_ID,
 212           PCI_CLASS_BRIDGE_PCI, PCI_ANY_ID, QFLAG_APPLY_ONCE, nvidia_bugs },
 213         { PCI_VENDOR_ID_VIA, PCI_ANY_ID,
 214           PCI_CLASS_BRIDGE_PCI, PCI_ANY_ID, QFLAG_APPLY_ONCE, via_bugs },
 215         { PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_K8_NB,
 216           PCI_CLASS_BRIDGE_HOST, PCI_ANY_ID, 0, fix_hypertransport_config },
 217         { PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_IXP400_SMBUS,
 218           PCI_CLASS_SERIAL_SMBUS, PCI_ANY_ID, 0, ati_bugs },
 219         { PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_SBX00_SMBUS,
 220           PCI_CLASS_SERIAL_SMBUS, PCI_ANY_ID, 0, ati_bugs_contd },
 221         {}
 222 };
 223
 224 /**
 225  * check_dev_quirk - apply early quirks to a given PCI device
 226  * @num: bus number
 227  * @slot: slot number
 228  * @func: PCI function
 229  *
 230  * Check the vendor & device ID against the early quirks table.
 231  *
 232  * If the device is single function, let early_quirks() know so we don't
 233  * poke at this device again.
 234  */
 235 static int __init check_dev_quirk(int num, int slot, int func)
 236 {
 237         u16 class;
 238         u16 vendor;
 239         u16 device;
 240         u8 type;
 241         int i;
 242
 243         class = read_pci_config_16(num, slot, func, PCI_CLASS_DEVICE);
 244
 245         if (class == 0xffff)
 246                 return -1; /* no class, treat as single function */
 247
 248         vendor = read_pci_config_16(num, slot, func, PCI_VENDOR_ID);
 249
 250         device = read_pci_config_16(num, slot, func, PCI_DEVICE_ID);
 251
 252         for (i = 0; early_qrk[i].f != NULL; i++) {
 253                 if (((early_qrk[i].vendor == PCI_ANY_ID) ||
 254                         (early_qrk[i].vendor == vendor)) &&
 255                         ((early_qrk[i].device == PCI_ANY_ID) ||
 256                         (early_qrk[i].device == device)) &&
 257                         (!((early_qrk[i].class ^ class) &
 258                             early_qrk[i].class_mask))) {
 259                                 if ((early_qrk[i].flags &
 260                                      QFLAG_DONE) != QFLAG_DONE)
 261                                         early_qrk[i].f(num, slot, func);
 262                                 early_qrk[i].flags |= QFLAG_APPLIED;
 263                         }
 264         }
 265
 266         type = read_pci_config_byte(num, slot, func,
 267                                     PCI_HEADER_TYPE);
 268         if (!(type & 0x80))
 269                 return -1;
 270
 271         return 0;
 272 }
 273
 274 void __init early_quirks(void)
 275 {
 276         int slot, func;
 277
 278         if (!early_pci_allowed())
 279                 return;
 280
 281         /* Poor man's PCI discovery */
 282         /* Only scan the root bus */
 283         for (slot = 0; slot < 32; slot++)
 284                 for (func = 0; func < 8; func++) {
 285                         /* Only probe function 0 on single fn devices */
 286                         if (check_dev_quirk(0, slot, func))
 287                                 break;
 288                 }
 289 }