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
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
9 Mainboard specific bugs should be handled by DMI entries.
10 CPU specific bugs in setup.c */
12 #include <linux/pci.h>
13 #include <linux/acpi.h>
14 #include <linux/pci_ids.h>
15 #include <asm/pci-direct.h>
17 #include <asm/io_apic.h>
19 #include <asm/iommu.h>
22 static void __init fix_hypertransport_config(int num, int slot, int func)
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
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");
41 write_pci_config(num, slot, func, 0x68, htcfg);
48 static void __init via_bugs(int num, int slot, int func)
50 #ifdef CONFIG_GART_IOMMU
51 if ((max_pfn > MAX_DMA32_PFN || force_iommu) &&
52 !gart_iommu_aperture_allowed) {
54 "Looks like a VIA chipset. Disabling IOMMU."
55 " Override with iommu=allowed\n");
56 gart_iommu_aperture_disabled = 1;
62 #ifdef CONFIG_X86_IO_APIC
64 static int __init nvidia_hpet_check(struct acpi_table_header *header)
68 #endif /* CONFIG_X86_IO_APIC */
69 #endif /* CONFIG_ACPI */
71 static void __init nvidia_bugs(int num, int slot, int func)
74 #ifdef CONFIG_X86_IO_APIC
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.
82 if (acpi_use_timer_override)
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 "
90 printk(KERN_INFO "If you got timer trouble "
91 "try acpi_use_timer_override\n");
95 /* RED-PEN skip them on mptables too? */
99 #if defined(CONFIG_ACPI) && defined(CONFIG_X86_IO_APIC)
100 static u32 __init ati_ixp4x0_rev(int num, int slot, int func)
105 b = read_pci_config_byte(num, slot, func, 0xac);
107 write_pci_config_byte(num, slot, func, 0xac, b);
109 d = read_pci_config(num, slot, func, 0x70);
111 write_pci_config(num, slot, func, 0x70, d);
113 d = read_pci_config(num, slot, func, 0x8);
118 static void __init ati_bugs(int num, int slot, int func)
123 if (acpi_use_timer_override)
126 d = ati_ixp4x0_rev(num, slot, func);
128 acpi_skip_timer_override = 1;
130 /* check for IRQ0 interrupt swap */
131 outb(0x72, 0xcd6); b = inb(0xcd7);
133 acpi_skip_timer_override = 1;
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");
144 static u32 __init ati_sbx00_rev(int num, int slot, int func)
148 d = read_pci_config(num, slot, func, 0x70);
151 write_pci_config(num, slot, func, 0x70, d);
152 d = read_pci_config(num, slot, func, 0x8);
154 write_pci_config(num, slot, func, 0x70, old);
159 static void __init ati_bugs_contd(int num, int slot, int func)
163 if (acpi_use_timer_override)
166 rev = ati_sbx00_rev(num, slot, func);
170 /* check for IRQ0 interrupt swap */
171 d = read_pci_config(num, slot, func, 0x64);
173 acpi_skip_timer_override = 1;
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");
183 static void __init ati_bugs(int num, int slot, int func)
187 static void __init ati_bugs_contd(int num, int slot, int func)
192 #define QFLAG_APPLY_ONCE 0x1
193 #define QFLAG_APPLIED 0x2
194 #define QFLAG_DONE (QFLAG_APPLY_ONCE|QFLAG_APPLIED)
201 void (*f)(int num, int slot, int func);
204 static struct chipset early_qrk[] __initdata = {
205 { PCI_VENDOR_ID_NVIDIA, PCI_ANY_ID,
206 PCI_CLASS_BRIDGE_PCI, PCI_ANY_ID, QFLAG_APPLY_ONCE, nvidia_bugs },
207 { PCI_VENDOR_ID_VIA, PCI_ANY_ID,
208 PCI_CLASS_BRIDGE_PCI, PCI_ANY_ID, QFLAG_APPLY_ONCE, via_bugs },
209 { PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_K8_NB,
210 PCI_CLASS_BRIDGE_HOST, PCI_ANY_ID, 0, fix_hypertransport_config },
211 { PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_IXP400_SMBUS,
212 PCI_CLASS_SERIAL_SMBUS, PCI_ANY_ID, 0, ati_bugs },
213 { PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_SBX00_SMBUS,
214 PCI_CLASS_SERIAL_SMBUS, PCI_ANY_ID, 0, ati_bugs_contd },
219 * check_dev_quirk - apply early quirks to a given PCI device
222 * @func: PCI function
224 * Check the vendor & device ID against the early quirks table.
226 * If the device is single function, let early_quirks() know so we don't
227 * poke at this device again.
229 static int __init check_dev_quirk(int num, int slot, int func)
237 class = read_pci_config_16(num, slot, func, PCI_CLASS_DEVICE);
240 return -1; /* no class, treat as single function */
242 vendor = read_pci_config_16(num, slot, func, PCI_VENDOR_ID);
244 device = read_pci_config_16(num, slot, func, PCI_DEVICE_ID);
246 for (i = 0; early_qrk[i].f != NULL; i++) {
247 if (((early_qrk[i].vendor == PCI_ANY_ID) ||
248 (early_qrk[i].vendor == vendor)) &&
249 ((early_qrk[i].device == PCI_ANY_ID) ||
250 (early_qrk[i].device == device)) &&
251 (!((early_qrk[i].class ^ class) &
252 early_qrk[i].class_mask))) {
253 if ((early_qrk[i].flags &
254 QFLAG_DONE) != QFLAG_DONE)
255 early_qrk[i].f(num, slot, func);
256 early_qrk[i].flags |= QFLAG_APPLIED;
260 type = read_pci_config_byte(num, slot, func,
268 void __init early_quirks(void)
272 if (!early_pci_allowed())
275 /* Poor man's PCI discovery */
276 for (num = 0; num < 32; num++)
277 for (slot = 0; slot < 32; slot++)
278 for (func = 0; func < 8; func++) {
279 /* Only probe function 0 on single fn devices */
280 if (check_dev_quirk(num, slot, func))