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 #include <asm/irq_remapping.h> 22 23 static void __init fix_hypertransport_config(int num, int slot, int func) 24 { 25 u32 htcfg; 26 /* 27 * we found a hypertransport bus 28 * make sure that we are broadcasting 29 * interrupts to all cpus on the ht bus 30 * if we're using extended apic ids 31 */ 32 htcfg = read_pci_config(num, slot, func, 0x68); 33 if (htcfg & (1 << 18)) { 34 printk(KERN_INFO "Detected use of extended apic ids " 35 "on hypertransport bus\n"); 36 if ((htcfg & (1 << 17)) == 0) { 37 printk(KERN_INFO "Enabling hypertransport extended " 38 "apic interrupt broadcast\n"); 39 printk(KERN_INFO "Note this is a bios bug, " 40 "please contact your hw vendor\n"); 41 htcfg |= (1 << 17); 42 write_pci_config(num, slot, func, 0x68, htcfg); 43 } 44 } 45 46 47 } 48 49 static void __init via_bugs(int num, int slot, int func) 50 { 51 #ifdef CONFIG_GART_IOMMU 52 if ((max_pfn > MAX_DMA32_PFN || force_iommu) && 53 !gart_iommu_aperture_allowed) { 54 printk(KERN_INFO 55 "Looks like a VIA chipset. Disabling IOMMU." 56 " Override with iommu=allowed\n"); 57 gart_iommu_aperture_disabled = 1; 58 } 59 #endif 60 } 61 62 #ifdef CONFIG_ACPI 63 #ifdef CONFIG_X86_IO_APIC 64 65 static int __init nvidia_hpet_check(struct acpi_table_header *header) 66 { 67 return 0; 68 } 69 #endif /* CONFIG_X86_IO_APIC */ 70 #endif /* CONFIG_ACPI */ 71 72 static void __init nvidia_bugs(int num, int slot, int func) 73 { 74 #ifdef CONFIG_ACPI 75 #ifdef CONFIG_X86_IO_APIC 76 /* 77 * All timer overrides on Nvidia are 78 * wrong unless HPET is enabled. 79 * Unfortunately that's not true on many Asus boards. 80 * We don't know yet how to detect this automatically, but 81 * at least allow a command line override. 82 */ 83 if (acpi_use_timer_override) 84 return; 85 86 if (acpi_table_parse(ACPI_SIG_HPET, nvidia_hpet_check)) { 87 acpi_skip_timer_override = 1; 88 printk(KERN_INFO "Nvidia board " 89 "detected. Ignoring ACPI " 90 "timer override.\n"); 91 printk(KERN_INFO "If you got timer trouble " 92 "try acpi_use_timer_override\n"); 93 } 94 #endif 95 #endif 96 /* RED-PEN skip them on mptables too? */ 97 98 } 99 100 #if defined(CONFIG_ACPI) && defined(CONFIG_X86_IO_APIC) 101 static u32 __init ati_ixp4x0_rev(int num, int slot, int func) 102 { 103 u32 d; 104 u8 b; 105 106 b = read_pci_config_byte(num, slot, func, 0xac); 107 b &= ~(1<<5); 108 write_pci_config_byte(num, slot, func, 0xac, b); 109 110 d = read_pci_config(num, slot, func, 0x70); 111 d |= 1<<8; 112 write_pci_config(num, slot, func, 0x70, d); 113 114 d = read_pci_config(num, slot, func, 0x8); 115 d &= 0xff; 116 return d; 117 } 118 119 static void __init ati_bugs(int num, int slot, int func) 120 { 121 u32 d; 122 u8 b; 123 124 if (acpi_use_timer_override) 125 return; 126 127 d = ati_ixp4x0_rev(num, slot, func); 128 if (d < 0x82) 129 acpi_skip_timer_override = 1; 130 else { 131 /* check for IRQ0 interrupt swap */ 132 outb(0x72, 0xcd6); b = inb(0xcd7); 133 if (!(b & 0x2)) 134 acpi_skip_timer_override = 1; 135 } 136 137 if (acpi_skip_timer_override) { 138 printk(KERN_INFO "SB4X0 revision 0x%x\n", d); 139 printk(KERN_INFO "Ignoring ACPI timer override.\n"); 140 printk(KERN_INFO "If you got timer trouble " 141 "try acpi_use_timer_override\n"); 142 } 143 } 144 145 static u32 __init ati_sbx00_rev(int num, int slot, int func) 146 { 147 u32 d; 148 149 d = read_pci_config(num, slot, func, 0x8); 150 d &= 0xff; 151 152 return d; 153 } 154 155 static void __init ati_bugs_contd(int num, int slot, int func) 156 { 157 u32 d, rev; 158 159 rev = ati_sbx00_rev(num, slot, func); 160 if (rev >= 0x40) 161 acpi_fix_pin2_polarity = 1; 162 163 /* 164 * SB600: revisions 0x11, 0x12, 0x13, 0x14, ... 165 * SB700: revisions 0x39, 0x3a, ... 166 * SB800: revisions 0x40, 0x41, ... 167 */ 168 if (rev >= 0x39) 169 return; 170 171 if (acpi_use_timer_override) 172 return; 173 174 /* check for IRQ0 interrupt swap */ 175 d = read_pci_config(num, slot, func, 0x64); 176 if (!(d & (1<<14))) 177 acpi_skip_timer_override = 1; 178 179 if (acpi_skip_timer_override) { 180 printk(KERN_INFO "SB600 revision 0x%x\n", rev); 181 printk(KERN_INFO "Ignoring ACPI timer override.\n"); 182 printk(KERN_INFO "If you got timer trouble " 183 "try acpi_use_timer_override\n"); 184 } 185 } 186 #else 187 static void __init ati_bugs(int num, int slot, int func) 188 { 189 } 190 191 static void __init ati_bugs_contd(int num, int slot, int func) 192 { 193 } 194 #endif 195 196 static void __init intel_remapping_check(int num, int slot, int func) 197 { 198 u8 revision; 199 200 revision = read_pci_config_byte(num, slot, func, PCI_REVISION_ID); 201 202 /* 203 * Revision 0x13 of this chipset supports irq remapping 204 * but has an erratum that breaks its behavior, flag it as such 205 */ 206 if (revision == 0x13) 207 set_irq_remapping_broken(); 208 209 } 210 211 #define QFLAG_APPLY_ONCE 0x1 212 #define QFLAG_APPLIED 0x2 213 #define QFLAG_DONE (QFLAG_APPLY_ONCE|QFLAG_APPLIED) 214 struct chipset { 215 u32 vendor; 216 u32 device; 217 u32 class; 218 u32 class_mask; 219 u32 flags; 220 void (*f)(int num, int slot, int func); 221 }; 222 223 /* 224 * Only works for devices on the root bus. If you add any devices 225 * not on bus 0 readd another loop level in early_quirks(). But 226 * be careful because at least the Nvidia quirk here relies on 227 * only matching on bus 0. 228 */ 229 static struct chipset early_qrk[] __initdata = { 230 { PCI_VENDOR_ID_NVIDIA, PCI_ANY_ID, 231 PCI_CLASS_BRIDGE_PCI, PCI_ANY_ID, QFLAG_APPLY_ONCE, nvidia_bugs }, 232 { PCI_VENDOR_ID_VIA, PCI_ANY_ID, 233 PCI_CLASS_BRIDGE_PCI, PCI_ANY_ID, QFLAG_APPLY_ONCE, via_bugs }, 234 { PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_K8_NB, 235 PCI_CLASS_BRIDGE_HOST, PCI_ANY_ID, 0, fix_hypertransport_config }, 236 { PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_IXP400_SMBUS, 237 PCI_CLASS_SERIAL_SMBUS, PCI_ANY_ID, 0, ati_bugs }, 238 { PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_SBX00_SMBUS, 239 PCI_CLASS_SERIAL_SMBUS, PCI_ANY_ID, 0, ati_bugs_contd }, 240 { PCI_VENDOR_ID_INTEL, 0x3403, PCI_CLASS_BRIDGE_HOST, 241 PCI_BASE_CLASS_BRIDGE, 0, intel_remapping_check }, 242 { PCI_VENDOR_ID_INTEL, 0x3406, PCI_CLASS_BRIDGE_HOST, 243 PCI_BASE_CLASS_BRIDGE, 0, intel_remapping_check }, 244 {} 245 }; 246 247 /** 248 * check_dev_quirk - apply early quirks to a given PCI device 249 * @num: bus number 250 * @slot: slot number 251 * @func: PCI function 252 * 253 * Check the vendor & device ID against the early quirks table. 254 * 255 * If the device is single function, let early_quirks() know so we don't 256 * poke at this device again. 257 */ 258 static int __init check_dev_quirk(int num, int slot, int func) 259 { 260 u16 class; 261 u16 vendor; 262 u16 device; 263 u8 type; 264 int i; 265 266 class = read_pci_config_16(num, slot, func, PCI_CLASS_DEVICE); 267 268 if (class == 0xffff) 269 return -1; /* no class, treat as single function */ 270 271 vendor = read_pci_config_16(num, slot, func, PCI_VENDOR_ID); 272 273 device = read_pci_config_16(num, slot, func, PCI_DEVICE_ID); 274 275 for (i = 0; early_qrk[i].f != NULL; i++) { 276 if (((early_qrk[i].vendor == PCI_ANY_ID) || 277 (early_qrk[i].vendor == vendor)) && 278 ((early_qrk[i].device == PCI_ANY_ID) || 279 (early_qrk[i].device == device)) && 280 (!((early_qrk[i].class ^ class) & 281 early_qrk[i].class_mask))) { 282 if ((early_qrk[i].flags & 283 QFLAG_DONE) != QFLAG_DONE) 284 early_qrk[i].f(num, slot, func); 285 early_qrk[i].flags |= QFLAG_APPLIED; 286 } 287 } 288 289 type = read_pci_config_byte(num, slot, func, 290 PCI_HEADER_TYPE); 291 if (!(type & 0x80)) 292 return -1; 293 294 return 0; 295 } 296 297 void __init early_quirks(void) 298 { 299 int slot, func; 300 301 if (!early_pci_allowed()) 302 return; 303 304 /* Poor man's PCI discovery */ 305 /* Only scan the root bus */ 306 for (slot = 0; slot < 32; slot++) 307 for (func = 0; func < 8; func++) { 308 /* Only probe function 0 on single fn devices */ 309 if (check_dev_quirk(0, slot, func)) 310 break; 311 } 312 } 313