arch/x86/kernel/quirks.c

   1 /*
   2  * This file contains work-arounds for x86 and x86_64 platform bugs.
   3  */
   4 #include <linux/pci.h>
   5 #include <linux/irq.h>
   6
   7 #include <asm/hpet.h>
   8
   9 #if defined(CONFIG_X86_IO_APIC) && defined(CONFIG_SMP) && defined(CONFIG_PCI)
  10
  11 static void __devinit quirk_intel_irqbalance(struct pci_dev *dev)
  12 {
  13         u8 config, rev;
  14         u16 word;
  15
  16         /* BIOS may enable hardware IRQ balancing for
  17          * E7520/E7320/E7525(revision ID 0x9 and below)
  18          * based platforms.
  19          * Disable SW irqbalance/affinity on those platforms.
  20          */
  21         pci_read_config_byte(dev, PCI_CLASS_REVISION, &rev);
  22         if (rev > 0x9)
  23                 return;
  24
  25         /* enable access to config space*/
  26         pci_read_config_byte(dev, 0xf4, &config);
  27         pci_write_config_byte(dev, 0xf4, config|0x2);
  28
  29         /*
  30          * read xTPR register.  We may not have a pci_dev for device 8
  31          * because it might be hidden until the above write.
  32          */
  33         pci_bus_read_config_word(dev->bus, PCI_DEVFN(8, 0), 0x4c, &word);
  34
  35         if (!(word & (1 << 13))) {
  36                 dev_info(&dev->dev, "Intel E7520/7320/7525 detected; "
  37                         "disabling irq balancing and affinity\n");
  38 #ifdef CONFIG_IRQBALANCE
  39                 irqbalance_disable("");
  40 #endif
  41                 noirqdebug_setup("");
  42 #ifdef CONFIG_PROC_FS
  43                 no_irq_affinity = 1;
  44 #endif
  45         }
  46
  47         /* put back the original value for config space*/
  48         if (!(config & 0x2))
  49                 pci_write_config_byte(dev, 0xf4, config);
  50 }
  51 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_E7320_MCH,
  52                         quirk_intel_irqbalance);
  53 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_E7525_MCH,
  54                         quirk_intel_irqbalance);
  55 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_E7520_MCH,
  56                         quirk_intel_irqbalance);
  57 #endif
  58
  59 #if defined(CONFIG_HPET_TIMER)
  60 unsigned long force_hpet_address;
  61
  62 static enum {
  63         NONE_FORCE_HPET_RESUME,
  64         OLD_ICH_FORCE_HPET_RESUME,
  65         ICH_FORCE_HPET_RESUME,
  66         VT8237_FORCE_HPET_RESUME,
  67         NVIDIA_FORCE_HPET_RESUME,
  68 } force_hpet_resume_type;
  69
  70 static void __iomem *rcba_base;
  71
  72 static void ich_force_hpet_resume(void)
  73 {
  74         u32 val;
  75
  76         if (!force_hpet_address)
  77                 return;
  78
  79         if (rcba_base == NULL)
  80                 BUG();
  81
  82         /* read the Function Disable register, dword mode only */
  83         val = readl(rcba_base + 0x3404);
  84         if (!(val & 0x80)) {
  85                 /* HPET disabled in HPTC. Trying to enable */
  86                 writel(val | 0x80, rcba_base + 0x3404);
  87         }
  88
  89         val = readl(rcba_base + 0x3404);
  90         if (!(val & 0x80))
  91                 BUG();
  92         else
  93                 printk(KERN_DEBUG "Force enabled HPET at resume\n");
  94
  95         return;
  96 }
  97
  98 static void ich_force_enable_hpet(struct pci_dev *dev)
  99 {
 100         u32 val;
 101         u32 uninitialized_var(rcba);
 102         int err = 0;
 103
 104         if (hpet_address || force_hpet_address)
 105                 return;
 106
 107         pci_read_config_dword(dev, 0xF0, &rcba);
 108         rcba &= 0xFFFFC000;
 109         if (rcba == 0) {
 110                 dev_printk(KERN_DEBUG, &dev->dev, "RCBA disabled; "
 111                         "cannot force enable HPET\n");
 112                 return;
 113         }
 114
 115         /* use bits 31:14, 16 kB aligned */
 116         rcba_base = ioremap_nocache(rcba, 0x4000);
 117         if (rcba_base == NULL) {
 118                 dev_printk(KERN_DEBUG, &dev->dev, "ioremap failed; "
 119                         "cannot force enable HPET\n");
 120                 return;
 121         }
 122
 123         /* read the Function Disable register, dword mode only */
 124         val = readl(rcba_base + 0x3404);
 125
 126         if (val & 0x80) {
 127                 /* HPET is enabled in HPTC. Just not reported by BIOS */
 128                 val = val & 0x3;
 129                 force_hpet_address = 0xFED00000 | (val << 12);
 130                 dev_printk(KERN_DEBUG, &dev->dev, "Force enabled HPET at "
 131                         "0x%lx\n", force_hpet_address);
 132                 iounmap(rcba_base);
 133                 return;
 134         }
 135
 136         /* HPET disabled in HPTC. Trying to enable */
 137         writel(val | 0x80, rcba_base + 0x3404);
 138
 139         val = readl(rcba_base + 0x3404);
 140         if (!(val & 0x80)) {
 141                 err = 1;
 142         } else {
 143                 val = val & 0x3;
 144                 force_hpet_address = 0xFED00000 | (val << 12);
 145         }
 146
 147         if (err) {
 148                 force_hpet_address = 0;
 149                 iounmap(rcba_base);
 150                 dev_printk(KERN_DEBUG, &dev->dev,
 151                         "Failed to force enable HPET\n");
 152         } else {
 153                 force_hpet_resume_type = ICH_FORCE_HPET_RESUME;
 154                 dev_printk(KERN_DEBUG, &dev->dev, "Force enabled HPET at "
 155                         "0x%lx\n", force_hpet_address);
 156         }
 157 }
 158
 159 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ESB2_0,
 160                          ich_force_enable_hpet);
 161 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH6_1,
 162                          ich_force_enable_hpet);
 163 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH7_0,
 164                          ich_force_enable_hpet);
 165 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH7_1,
 166                          ich_force_enable_hpet);
 167 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH7_31,
 168                          ich_force_enable_hpet);
 169 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH8_1,
 170                          ich_force_enable_hpet);
 171 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH9_7,
 172                          ich_force_enable_hpet);
 173
 174
 175 static struct pci_dev *cached_dev;
 176
 177 static void old_ich_force_hpet_resume(void)
 178 {
 179         u32 val;
 180         u32 uninitialized_var(gen_cntl);
 181
 182         if (!force_hpet_address || !cached_dev)
 183                 return;
 184
 185         pci_read_config_dword(cached_dev, 0xD0, &gen_cntl);
 186         gen_cntl &= (~(0x7 << 15));
 187         gen_cntl |= (0x4 << 15);
 188
 189         pci_write_config_dword(cached_dev, 0xD0, gen_cntl);
 190         pci_read_config_dword(cached_dev, 0xD0, &gen_cntl);
 191         val = gen_cntl >> 15;
 192         val &= 0x7;
 193         if (val == 0x4)
 194                 printk(KERN_DEBUG "Force enabled HPET at resume\n");
 195         else
 196                 BUG();
 197 }
 198
 199 static void old_ich_force_enable_hpet(struct pci_dev *dev)
 200 {
 201         u32 val;
 202         u32 uninitialized_var(gen_cntl);
 203
 204         if (hpet_address || force_hpet_address)
 205                 return;
 206
 207         pci_read_config_dword(dev, 0xD0, &gen_cntl);
 208         /*
 209          * Bit 17 is HPET enable bit.
 210          * Bit 16:15 control the HPET base address.
 211          */
 212         val = gen_cntl >> 15;
 213         val &= 0x7;
 214         if (val & 0x4) {
 215                 val &= 0x3;
 216                 force_hpet_address = 0xFED00000 | (val << 12);
 217                 dev_printk(KERN_DEBUG, &dev->dev, "HPET at 0x%lx\n",
 218                         force_hpet_address);
 219                 return;
 220         }
 221
 222         /*
 223          * HPET is disabled. Trying enabling at FED00000 and check
 224          * whether it sticks
 225          */
 226         gen_cntl &= (~(0x7 << 15));
 227         gen_cntl |= (0x4 << 15);
 228         pci_write_config_dword(dev, 0xD0, gen_cntl);
 229
 230         pci_read_config_dword(dev, 0xD0, &gen_cntl);
 231
 232         val = gen_cntl >> 15;
 233         val &= 0x7;
 234         if (val & 0x4) {
 235                 /* HPET is enabled in HPTC. Just not reported by BIOS */
 236                 val &= 0x3;
 237                 force_hpet_address = 0xFED00000 | (val << 12);
 238                 dev_printk(KERN_DEBUG, &dev->dev, "Force enabled HPET at "
 239                         "0x%lx\n", force_hpet_address);
 240                 cached_dev = dev;
 241                 force_hpet_resume_type = OLD_ICH_FORCE_HPET_RESUME;
 242                 return;
 243         }
 244
 245         dev_printk(KERN_DEBUG, &dev->dev, "Failed to force enable HPET\n");
 246 }
 247
 248 /*
 249  * Undocumented chipset features. Make sure that the user enforced
 250  * this.
 251  */
 252 static void old_ich_force_enable_hpet_user(struct pci_dev *dev)
 253 {
 254         if (hpet_force_user)
 255                 old_ich_force_enable_hpet(dev);
 256 }
 257
 258 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801CA_0,
 259                          old_ich_force_enable_hpet_user);
 260 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801CA_12,
 261                          old_ich_force_enable_hpet_user);
 262 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801DB_0,
 263                          old_ich_force_enable_hpet_user);
 264 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801DB_12,
 265                          old_ich_force_enable_hpet_user);
 266 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801EB_0,
 267                          old_ich_force_enable_hpet);
 268 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801EB_12,
 269                          old_ich_force_enable_hpet);
 270
 271
 272 static void vt8237_force_hpet_resume(void)
 273 {
 274         u32 val;
 275
 276         if (!force_hpet_address || !cached_dev)
 277                 return;
 278
 279         val = 0xfed00000 | 0x80;
 280         pci_write_config_dword(cached_dev, 0x68, val);
 281
 282         pci_read_config_dword(cached_dev, 0x68, &val);
 283         if (val & 0x80)
 284                 printk(KERN_DEBUG "Force enabled HPET at resume\n");
 285         else
 286                 BUG();
 287 }
 288
 289 static void vt8237_force_enable_hpet(struct pci_dev *dev)
 290 {
 291         u32 uninitialized_var(val);
 292
 293         if (!hpet_force_user || hpet_address || force_hpet_address)
 294                 return;
 295
 296         pci_read_config_dword(dev, 0x68, &val);
 297         /*
 298          * Bit 7 is HPET enable bit.
 299          * Bit 31:10 is HPET base address (contrary to what datasheet claims)
 300          */
 301         if (val & 0x80) {
 302                 force_hpet_address = (val & ~0x3ff);
 303                 dev_printk(KERN_DEBUG, &dev->dev, "HPET at 0x%lx\n",
 304                         force_hpet_address);
 305                 return;
 306         }
 307
 308         /*
 309          * HPET is disabled. Trying enabling at FED00000 and check
 310          * whether it sticks
 311          */
 312         val = 0xfed00000 | 0x80;
 313         pci_write_config_dword(dev, 0x68, val);
 314
 315         pci_read_config_dword(dev, 0x68, &val);
 316         if (val & 0x80) {
 317                 force_hpet_address = (val & ~0x3ff);
 318                 dev_printk(KERN_DEBUG, &dev->dev, "Force enabled HPET at "
 319                         "0x%lx\n", force_hpet_address);
 320                 cached_dev = dev;
 321                 force_hpet_resume_type = VT8237_FORCE_HPET_RESUME;
 322                 return;
 323         }
 324
 325         dev_printk(KERN_DEBUG, &dev->dev, "Failed to force enable HPET\n");
 326 }
 327
 328 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8235,
 329                          vt8237_force_enable_hpet);
 330 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8237,
 331                          vt8237_force_enable_hpet);
 332
 333 /*
 334  * Undocumented chipset feature taken from LinuxBIOS.
 335  */
 336 static void nvidia_force_hpet_resume(void)
 337 {
 338         pci_write_config_dword(cached_dev, 0x44, 0xfed00001);
 339         printk(KERN_DEBUG "Force enabled HPET at resume\n");
 340 }
 341
 342 static void nvidia_force_enable_hpet(struct pci_dev *dev)
 343 {
 344         u32 uninitialized_var(val);
 345
 346         if (!hpet_force_user || hpet_address || force_hpet_address)
 347                 return;
 348
 349         pci_write_config_dword(dev, 0x44, 0xfed00001);
 350         pci_read_config_dword(dev, 0x44, &val);
 351         force_hpet_address = val & 0xfffffffe;
 352         force_hpet_resume_type = NVIDIA_FORCE_HPET_RESUME;
 353         dev_printk(KERN_DEBUG, &dev->dev, "Force enabled HPET at 0x%lx\n",
 354                 force_hpet_address);
 355         cached_dev = dev;
 356         return;
 357 }
 358
 359 /* ISA Bridges */
 360 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NVIDIA, 0x0050,
 361                         nvidia_force_enable_hpet);
 362 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NVIDIA, 0x0051,
 363                         nvidia_force_enable_hpet);
 364
 365 /* LPC bridges */
 366 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NVIDIA, 0x0260,
 367                         nvidia_force_enable_hpet);
 368 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NVIDIA, 0x0360,
 369                         nvidia_force_enable_hpet);
 370 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NVIDIA, 0x0361,
 371                         nvidia_force_enable_hpet);
 372 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NVIDIA, 0x0362,
 373                         nvidia_force_enable_hpet);
 374 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NVIDIA, 0x0363,
 375                         nvidia_force_enable_hpet);
 376 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NVIDIA, 0x0364,
 377                         nvidia_force_enable_hpet);
 378 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NVIDIA, 0x0365,
 379                         nvidia_force_enable_hpet);
 380 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NVIDIA, 0x0366,
 381                         nvidia_force_enable_hpet);
 382 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NVIDIA, 0x0367,
 383                         nvidia_force_enable_hpet);
 384
 385 void force_hpet_resume(void)
 386 {
 387         switch (force_hpet_resume_type) {
 388         case ICH_FORCE_HPET_RESUME:
 389                 ich_force_hpet_resume();
 390                 return;
 391         case OLD_ICH_FORCE_HPET_RESUME:
 392                 old_ich_force_hpet_resume();
 393                 return;
 394         case VT8237_FORCE_HPET_RESUME:
 395                 vt8237_force_hpet_resume();
 396                 return;
 397         case NVIDIA_FORCE_HPET_RESUME:
 398                 nvidia_force_hpet_resume();
 399                 return;
 400         default:
 401                 break;
 402         }
 403 }
 404
 405 #endif