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         u32 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         /* read xTPR register */
  30         raw_pci_ops->read(0, 0, 0x40, 0x4c, 2, &word);
  31
  32         if (!(word & (1 << 13))) {
  33                 printk(KERN_INFO "Intel E7520/7320/7525 detected. "
  34                         "Disabling irq balancing and affinity\n");
  35 #ifdef CONFIG_IRQBALANCE
  36                 irqbalance_disable("");
  37 #endif
  38                 noirqdebug_setup("");
  39 #ifdef CONFIG_PROC_FS
  40                 no_irq_affinity = 1;
  41 #endif
  42         }
  43
  44         /* put back the original value for config space*/
  45         if (!(config & 0x2))
  46                 pci_write_config_byte(dev, 0xf4, config);
  47 }
  48 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL,    PCI_DEVICE_ID_INTEL_E7320_MCH,  quirk_intel_irqbalance);
  49 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL,    PCI_DEVICE_ID_INTEL_E7525_MCH,  quirk_intel_irqbalance);
  50 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL,    PCI_DEVICE_ID_INTEL_E7520_MCH,  quirk_intel_irqbalance);
  51 #endif
  52
  53 #if defined(CONFIG_HPET_TIMER)
  54 unsigned long force_hpet_address;
  55
  56 static enum {
  57         NONE_FORCE_HPET_RESUME,
  58         OLD_ICH_FORCE_HPET_RESUME,
  59         ICH_FORCE_HPET_RESUME
  60 } force_hpet_resume_type;
  61
  62 static void __iomem *rcba_base;
  63
  64 static void ich_force_hpet_resume(void)
  65 {
  66         u32 val;
  67
  68         if (!force_hpet_address)
  69                 return;
  70
  71         if (rcba_base == NULL)
  72                 BUG();
  73
  74         /* read the Function Disable register, dword mode only */
  75         val = readl(rcba_base + 0x3404);
  76         if (!(val & 0x80)) {
  77                 /* HPET disabled in HPTC. Trying to enable */
  78                 writel(val | 0x80, rcba_base + 0x3404);
  79         }
  80
  81         val = readl(rcba_base + 0x3404);
  82         if (!(val & 0x80))
  83                 BUG();
  84         else
  85                 printk(KERN_DEBUG "Force enabled HPET at resume\n");
  86
  87         return;
  88 }
  89
  90 static void ich_force_enable_hpet(struct pci_dev *dev)
  91 {
  92         u32 val;
  93         u32 uninitialized_var(rcba);
  94         int err = 0;
  95
  96         if (hpet_address || force_hpet_address)
  97                 return;
  98
  99         pci_read_config_dword(dev, 0xF0, &rcba);
 100         rcba &= 0xFFFFC000;
 101         if (rcba == 0) {
 102                 printk(KERN_DEBUG "RCBA disabled. Cannot force enable HPET\n");
 103                 return;
 104         }
 105
 106         /* use bits 31:14, 16 kB aligned */
 107         rcba_base = ioremap_nocache(rcba, 0x4000);
 108         if (rcba_base == NULL) {
 109                 printk(KERN_DEBUG "ioremap failed. Cannot force enable HPET\n");
 110                 return;
 111         }
 112
 113         /* read the Function Disable register, dword mode only */
 114         val = readl(rcba_base + 0x3404);
 115
 116         if (val & 0x80) {
 117                 /* HPET is enabled in HPTC. Just not reported by BIOS */
 118                 val = val & 0x3;
 119                 force_hpet_address = 0xFED00000 | (val << 12);
 120                 printk(KERN_DEBUG "Force enabled HPET at base address 0x%lx\n",
 121                                force_hpet_address);
 122                 iounmap(rcba_base);
 123                 return;
 124         }
 125
 126         /* HPET disabled in HPTC. Trying to enable */
 127         writel(val | 0x80, rcba_base + 0x3404);
 128
 129         val = readl(rcba_base + 0x3404);
 130         if (!(val & 0x80)) {
 131                 err = 1;
 132         } else {
 133                 val = val & 0x3;
 134                 force_hpet_address = 0xFED00000 | (val << 12);
 135         }
 136
 137         if (err) {
 138                 force_hpet_address = 0;
 139                 iounmap(rcba_base);
 140                 printk(KERN_DEBUG "Failed to force enable HPET\n");
 141         } else {
 142                 force_hpet_resume_type = ICH_FORCE_HPET_RESUME;
 143                 printk(KERN_DEBUG "Force enabled HPET at base address 0x%lx\n",
 144                                force_hpet_address);
 145         }
 146 }
 147
 148 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ESB2_0,
 149                          ich_force_enable_hpet);
 150 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH6_1,
 151                          ich_force_enable_hpet);
 152 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH7_1,
 153                          ich_force_enable_hpet);
 154 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH7_31,
 155                          ich_force_enable_hpet);
 156 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH8_1,
 157                          ich_force_enable_hpet);
 158
 159
 160 static struct pci_dev *cached_dev;
 161
 162 static void old_ich_force_hpet_resume(void)
 163 {
 164         u32 val;
 165         u32 uninitialized_var(gen_cntl);
 166
 167         if (!force_hpet_address || !cached_dev)
 168                 return;
 169
 170         pci_read_config_dword(cached_dev, 0xD0, &gen_cntl);
 171         gen_cntl &= (~(0x7 << 15));
 172         gen_cntl |= (0x4 << 15);
 173
 174         pci_write_config_dword(cached_dev, 0xD0, gen_cntl);
 175         pci_read_config_dword(cached_dev, 0xD0, &gen_cntl);
 176         val = gen_cntl >> 15;
 177         val &= 0x7;
 178         if (val == 0x4)
 179                 printk(KERN_DEBUG "Force enabled HPET at resume\n");
 180         else
 181                 BUG();
 182 }
 183
 184 static void old_ich_force_enable_hpet(struct pci_dev *dev)
 185 {
 186         u32 val;
 187         u32 uninitialized_var(gen_cntl);
 188
 189         if (hpet_address || force_hpet_address)
 190                 return;
 191
 192         pci_read_config_dword(dev, 0xD0, &gen_cntl);
 193         /*
 194          * Bit 17 is HPET enable bit.
 195          * Bit 16:15 control the HPET base address.
 196          */
 197         val = gen_cntl >> 15;
 198         val &= 0x7;
 199         if (val & 0x4) {
 200                 val &= 0x3;
 201                 force_hpet_address = 0xFED00000 | (val << 12);
 202                 printk(KERN_DEBUG "HPET at base address 0x%lx\n",
 203                                force_hpet_address);
 204                 cached_dev = dev;
 205                 return;
 206         }
 207
 208         /*
 209          * HPET is disabled. Trying enabling at FED00000 and check
 210          * whether it sticks
 211          */
 212         gen_cntl &= (~(0x7 << 15));
 213         gen_cntl |= (0x4 << 15);
 214         pci_write_config_dword(dev, 0xD0, gen_cntl);
 215
 216         pci_read_config_dword(dev, 0xD0, &gen_cntl);
 217
 218         val = gen_cntl >> 15;
 219         val &= 0x7;
 220         if (val & 0x4) {
 221                 /* HPET is enabled in HPTC. Just not reported by BIOS */
 222                 val &= 0x3;
 223                 force_hpet_address = 0xFED00000 | (val << 12);
 224                 printk(KERN_DEBUG "Force enabled HPET at base address 0x%lx\n",
 225                                force_hpet_address);
 226                 force_hpet_resume_type = OLD_ICH_FORCE_HPET_RESUME;
 227                 return;
 228         }
 229
 230         printk(KERN_DEBUG "Failed to force enable HPET\n");
 231 }
 232
 233 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801EB_0,
 234                          old_ich_force_enable_hpet);
 235 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801EB_12,
 236                          old_ich_force_enable_hpet);
 237
 238 void force_hpet_resume(void)
 239 {
 240         switch (force_hpet_resume_type) {
 241             case ICH_FORCE_HPET_RESUME:
 242                 return ich_force_hpet_resume();
 243
 244             case OLD_ICH_FORCE_HPET_RESUME:
 245                 return old_ich_force_hpet_resume();
 246
 247             default:
 248                 break;
 249         }
 250 }
 251
 252 #endif